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    • 专利摘要:
    A gearbox injection unit (10), which comprises a fluid injector (12) having a fluid inlet (30) and a fluid outlet (32), a tube member (42), a filter (204), a volume reduction member and a cap member (206), wherein the filter (204) is disposed, the cap member (206) cooperating with and attached to the volume reduction member so as to the filter (204), the volume reduction element and the cap form a single element.
    公开号:FR3071009A1
    申请号:FR1871034
    申请日:2018-09-13
    公开日:2019-03-15
    发明作者:Stephen C. Bugos；Josh Lee Hatfield
    申请人:Continental Automotive Systems Inc；
    IPC主号:
    专利说明:

    FLUID VOLUME REDUCTION INJECTOR
    Technical Field [0001] The present invention relates, in general, to a fluid injector of a reducer injection unit (UIR) and, in particular, to a robust fluid injector of the UIR for non-purge applications.
    PRIOR ART [0002] The emission regulations in Europe and in North America entail the implementation of new exhaust after-treatment systems, in particular for lean combustion technologies, such as compression-ignition engines ( diesel) and stratified charge spark ignition engines (usually direct injection), which operate in poor and ultra-poor conditions. Lean combustion engines have levels of nitrogen oxide (NOx) emissions, which are difficult to deal with in oxygen-rich exhaust environments characteristic of lean combustion. Exhaust post-treatment technologies are commonly developed in order to treat NOx under these conditions.
    One of these technologies includes a catalyst, which facilitates the reactions of ammonia (NH 3 ) on the exhaust nitrogen oxides (NOx) to produce nitrogen (N 2 ) and l (H 2 O)
    This technology is called catalytic reduction
    Ammonia is difficult to handle in its pure form in cars, this is why it is usual to use with these systems a diesel exhaust fluid (FED) and / or a liquid aqueous solution of urea, typically at a concentration at
    32% urea (CO (NH 2 ) 2 )
    We denote this solution by
    AUS-32 and it is also known under the trade name of
    AdBlue. The reducing solution is sent to a hot exhaust stream normally by use before the injector, and is transformed into ammonia the catalyst.
    More specifically, the solution is sent to a hot exhaust stream and is transformed into ammonia in the exhaust after having undergone thermolysis, or thermal decomposition, into ammonia and isocyanic acid (HNCO). The isocyanic acid then undergoes hydrolysis by the water present in the exhaust and is transformed into ammonia and carbon dioxide (CO 2 ), the ammonia coming from thermolysis and from hydrolysis then undergoing a catalyzed reaction with nitrogen oxides, as described above.
    AUS-32, or AdBlue, has a freezing point of
    -11 ° C and you can expect the system to freeze in cold climates. As these fluids are aqueous, an increase in volume occurs after the transition to the solid state during freezing. The expanding solid can apply significant forces to any enclosed volume, such as an injector. This expansion can damage the injection unit and that is why there are different RCS strategies to cope with the expansion of the reducer.
    There are two known SCR system strategies on the market: purge systems and non-purge systems. In purge RCS systems, the reducing urea and / or an FED solution is purged from the UIR when the vehicle engine is stopped. In RCS systems without bleeding, the gear unit remains in the UIR for the life of the vehicle. During normal operation of an SCR system with purging, the injector of the UIR operates at temperatures, which are above the freezing point of the reducer, so that the reducer in the UIR remains at the liquid state. However, when the vehicle engine is stopped in the RCS system without bleeding, the UIR injector remains filled with reducer, this mistletoe makes the UIR injector susceptible to damage by expansion of the reducer in freezing conditions.
    SUMMARY OF THE INVENTION Embodiments given by way of example overcome the drawbacks of the fluid injectors of the existing UIR and provide an improved fluid injector for RCS systems without bleeding in which the harmful effects of the UIR, being at temperatures which are lower than the freezing point of the reducer, are reduced. According to an exemplary embodiment, a UIR comprises a fluid injector having a fluid inlet, disposed at a first end of the fluid injector to receive a reducer, and a fluid outlet disposed at a second end of the fluid injector for discharging the reducer, the fluid injector defining a fluid path for the reducer from the fluid inlet to the fluid outlet, the fluid injector comprising a tube element having one end, disposed at or near the fluid inlet of the fluid injector, the tube member being configured to pass from the reducer, along the fluid path; a filter, arranged in the tube element, near the inlet of the fluid inlet of the fluid injector, a volume reduction element, arranged in the tube element downstream of the filter relative to a direction of flow of the reducer in the fluid path from the fluid inlet to the fluid outlet of the fluid injector, the volume reduction member coming into contact with an inner surface of the tube and comprising a bore defined in the volume reduction element, the bore defining at least part of the fluid path in the fluid injector, the bore having a diameter smaller than an outside diameter of the volume reduction element and the volume reduction element occupying a volume in the tube element, so that the volume reduction element reduces a volume occupied by the fluid path for the reducer in the fluid injector and a coi element ffe, in which the filter is arranged, the cap element cooperating with the volume reduction element and being fixed thereto, so that the filter, the volume reduction element and the cap form a single element .
    In an embodiment given by way of example, the volume reduction element comprises a first part and a second part, the first part having an outside diameter smaller than an outside diameter of the second part and the cap element cooperates with the first part of the volume reduction element. The cap member and the first part of the volume reduction member are made of metal and / or a metal composition.
    In addition, a little of the first part of the volume reduction element is arranged in the cap element and an outside diameter of the cap element is equal to the outside diameter of the second part of the volume reduction element.
    In one embodiment given by way of example, the cap element is force-fitted with the first part of the volume reduction element. In another embodiment given by way of example, the cap element is welded to the first part of the volume reduction element.
    The volume reduction element may comprise an angular surface between the first part and the second part, the angular surface making an angle, other than an angle, orthogonal, with a longitudinal axis of the reduction element. volume.
    In some embodiments given by way of example, the first part and a first part of the second part of the volume reduction element are made of a metallic composition and a second part of the second part of the volume reduction element is a plastic composition. In an embodiment given by way of example, the second part of the second part of the volume reduction element is overmolded on at least a little of the first part of its second part. In addition, the first part of the second part of the volume reduction element defines a flange around which the second part of the second part of the volume reduction element is molded, the flange being arranged radially inwards. the outside diameter of the second part of the volume reduction element.
    [0012]
    In an exemplary embodiment, the cap member comprises a cylindrical shaped side wall, having first and second axial ends and an annular member, which extends radially inward from the first axial end and in which the second axial end of the cap element is arranged around a part of the volume reduction element and cooperates with it.
    Brief description of the drawings [0013] Facets of the invention will be explained in detail below, with reference to an embodiment given by way of example, in conjunction with the drawings in which:
    [0014] the figure 1 is a side view in section of a UIR for an RCS system without bleeding according to an embodiment given asFor example; [0015] the figure 2 is a side view in section of a fluid injector of the UIR of Figure 1; [0016] the figure 3 is a sectional view to more
    large scale of the inlet part of the fluid injector of the UIR of FIG. 1 according to an embodiment given by way of example;
    Figure 4 [518] Figure 5 [0019] Figure 6 [0020] Figure 7 is an exploded perspective view of elements of the fluid injector of the UIR of Figure 1 according to a mode of example given;
    is an enlarged sectional view of the outlet portion of the fluid injector of the UIR of Figure 1 according to an embodiment given by way of example;
    is an enlarged sectional view of the inlet part of the fluid injector of the UIR of Figure 1 according to an embodiment given by way of example;
    is a perspective view
    exploded items of The injector fluid the Figure 6;
    Figure 8 is a sectional view of the elements of Figure 6;
    Figure 9 is an enlarged sectional view of the inlet portion of the fluid injector of the UIR of Figure 1 according to yet another embodiment given as is a sectional view d 'elements of the fluid injector of Figure 9;
    Figure 10 example;
    Figure 11 is a perspective view of an element of the fluid injector of Figure 9;
    Description of the embodiments the description which follows of the embodiments given by way of example is merely illustrative in nature and is not intended in any way to limit the invention, its application or its uses.
    The embodiments given by way of example are aimed, in general, at a UIR for a RCS system without purging, in which the damaging effects of a reducing agent, an FDE and / or a urea solution freezing in the UIR injector are decreased.
    Figure 1 illustrates a UIR 10 of a system
    RCS without purging according to an embodiment given by way of example. The UIR 10 includes an electromagnet fluid injector, indicated generally by 12, which provides a fluid metering function and provides the preparation for spraying the fluid into the exhaust path of a vehicle in an application of dosage. The fluid injector 12 is thus constructed and arranged to be associated with an exhaust gas flow path upstream of a catalytic converter (not shown) by selective catalytic reduction (RCS). The fluid injector 12 can be an electrically powered electromagnet fuel injector. As shown in Figures 1 and 2, the fluid injector 12 includes an actuator unit having a coil 14 and a movable frame 16. Elements of the injector 12 define a fluid path for a reducer, an FDE and / or a urea solution in the injector 12. The reducer, the FDE and / or the urea solution, than the UIR 10 is configured to inject into the exhaust path of a vehicle engine, will be designated hereinafter by reducer for the sake of simplicity.
    The fluid injector 12 is disposed in a support 18 inside the UIR 10, as shown in Figure 1. An injector protection, indicated generally by 20, is formed of a protection Upper 20A and lower protection 20B, which surround the injector 12 and are connected to the support 18 by folding tabs of a flange 22 of the lower protection 20B on the folding features of the support 18 and the upper protection 20A . It follows that the protection 20 and the support 18 are fixed relative to the injector 12.
    [0029]
    UIR inlet cup structure
    10, indicated generally by 24 in Figure 1, comprises a cup 26 and a fluid supply tube 28 formed in one piece with the cup 26. The fluid supply tube 28 communicates with a source of a reducer (not shown), which is sent into a fluid inlet 30 of the injector 12 for ejection from its fluid outlet 12 and into the exhaust stream of a vehicle engine (not shown ). The fluid inlet 30 of the injector 12 is in fluid communication with the fluid supply tube 28. The fluid outlet 32 communicates fluidly with an outlet 34 of an exhaust flange 36, which is directly coupled with one end of the lower protection 20B of the UIR 10.
    The injector 12 comprises an injector body structure, in which the elements of the injector 12 are arranged. The injector body structure comprises a first part 38 of injector body, in which are arranged a coil 14 and a frame 16, and a part 40 of valve body, in which is disposed, at least in part, a injector valve assembly 12. The first part 38 of the injector body and the part 40 of the valve body are fixedly connected, directly or indirectly, to each other.
    Referring to Figures 1 to 3, a fluid injector 12 comprises a tube element 42, which is arranged, at least in part, in the first part 38 of the injector body. The outer surface of the tube member 42 is in contact with the inner surface of the first part 38 of the injector body. An open end of the element 42 is disposed in the cup 26 and is in fluid communication with the fluid supply tube 28. An O-ring 44 is placed in the cup 26 between an inner surface of the latter of the element 42 of the open end of O-ring 44 used to exit from the tube 28 passes into the tube end of the injector 12.
    and the outer tube surface, near the tube member 42. Ensure that of the reducer, fluid supply, open of the element 42 of [0032] [0033]
    The actuator unit of the fluid injector 12 further comprises a pole piece 46, which is fixedly disposed in the first part 38 of the body of the injector. The coil 14 surrounds, at least in part, the pole piece 46 and the frame 16. The pole piece 46 is disposed upstream of the frame 16 in the injector 12. The pole piece 46 includes a central bore defined axially in it.
    The frame 16 comprises a U-shaped part, which defines a pocket, in which is disposed at least part of a spring 50. The spring 50, which is part of the actuator unit, pushes the frame 16 movable, so that the armature 16 is spaced from the pole piece 46 when it does not pass current through the coil 14. The spring 50 extends partially in the central bore of the pole piece 46 . One end of the spring 50, which extends in the pole piece 46, is in contact with a
    tube 52 of setting spring. The tube 52 of setting of spring is willing, at less in part, in the central bore of the room 46 polar, in uphill (compared at meaning of
    the flow of the reducer in the injector 12) of the spring 50. The tube 52 for adjusting the spring comprises a bore defined axially therein. The through bore of the spring adjustment tube 52 partially defines the fluid path for the reducer in the fluid injector 12 and defines the only fluid path for the reducer in the pole piece 46. Due to its cooperation with the spring 50, the spring adjustment tube 52 is used to calibrate the dynamic flow of the reducer - in the fluid injector 12.
    The frame 16 further comprises one or more channels 60 (Figures 1 and 2) defined in the frame 16 and going from an interior of the pocket to an end portion upstream of an element 58 of spindle. The channels 60 can be distributed equally around the frame 16. In an embodiment given by way of example, the frame 16 comprises a single channel, which is defined entirely around the base of the pocket formed by the wall. 16A from the pocket. The channel or channels 60 allows the reducer to pass from the pocket of the frame 16 to the space around the upstream end of the pin element 58.
    The door of the frame 16 and the channel (s) 60 define in part together the reducing fluid path of the fluid injector 12 and define the only part of the fluid path passing through or around the frame 16 this.
    [0035]
    Referring to the figures
    1, and
    5, the assembly of the injector 12 comprises a seal joint element is connected to a frame 16 by the pin element, which is mounted between the seal element 54 and the downstream end of the frame
    16.
    The seal element 54, the pin element 58 and the frame 16 can be combined to form a frame assembly.
    When the coil 14 is energized, the coil 14 produces an electromagnetic force acting on the armature 16, which overcomes the force of the spring 50 and cause the armature 16 to move towards the pole piece, which in a way correspondent moves
    The spindle element, so as to lift
    The seat joint element 56 and to stop the cooperation thereof, by moving the armature assembly to an open position and allowing the reducer to pass through the fluid outlet to the flange outlet and in the vehicle engine exhaust path.
    no longer energized, the electromagnetic force dissipates and the spring 50 acts on the armature
    16, so that pole piece 46, which results in the fact that the element 54 of seal, cooperating sealingly with the seat
    56, returns the armature assembly to a closed position. The armature assembly being in the closed position, the reducer is prevented from passing through the seat 56 and into the flange outlet 34 and from going into the exhaust path of the vehicle engine.
    As mentioned above, the UIR 10 forms part of an exhaust post-processing system of an RCS without purging. It follows that the reducer remains in the fluid injector 12 after the vehicle engine has been stopped. In certain embodiments given by way of example, the fluid injector 12 is configured so as to reduce the quantity of reducing agent in the fluid injector 12. In other words, the total volume of the path, of fluid for the reducing agent in the fluid injector 12 is reduced. By having less space for reducer in the injector 12, the amount of reducer in the UIR 10, which can potentially freeze, is reduced, making the injector 12 less likely to be damaged by extension forces from the frozen reducer.
    In order to reduce the volume of the reducing fluid path in the fluid injector 12, the thickness of the part 40 of the valve body is increased. In addition, the spindle member 58 is constructed as a solid member, so that reducer passes around the exterior surface of the spindle member 58 instead of passing therein. The distance between the outer surface of the pin 58 and the inner surface of the part 40 of the valve body, which partly defines the fluid path for the reducing agent in the injector 12, is reduced. This reduced portion of the fluid path is the only fluid path for the reducer between the frame 16 and the seat 56 in the fluid injector 12. The reduced fluid path between pin 58 and part 40 of the valve body provides sufficient reducer flow through the fluid injector 12 to inject reducer during normal operation of the UIR 10, while maintaining a relatively small volume of reducer in the injector 12, so as to reduce the danger that the injector 12 is damaged by the fact that the reducer freezes there.
    In addition, the diameter of the pocket of the frame
    16, in which the spring 50 is arranged at least in part, is reduced, which makes it possible to increase the thickness of the pocket wall 16A of the frame 16. In an embodiment given by way of example, the thickness of the pocket wall 16A represents between 45% and. 75% of the diameter of the pocket, such as around 60%.
    The increase in the thickness of the wall 16A of the pocket as well as the increased thickness of the part 40 of the valve body and the fact that the pin element 50 is a solid pin means that the elements of the injector 12 are reinforced and thus more resistant to freezing forces of the reducer.
    In addition, the bore of the tube 52 for adjusting the spring is dimensioned to reduce the volume of the fluid path of the reducer in the injector 12. In one embodiment given by way of example, the diameter of the bore of the spring adjustment tube 52 represents between 12% and 22% of the external diameter of the pole piece 46 and, in particular, between 16% and 19% thereof.
    Figure 3 illustrates a part upstream of the injector 12. The tube element 42 extends at least partially in the injector. The fluid path of the reducer in the injector 12 passes through the tube element 42. The injector 12 comprises a filter 204 disposed in the tube element 42 near the open end thereof. Filter 204 is a structurally rigid sintered metal filter, such as a stainless steel material, to better resist expansion forces from freezing of the reducer. The filter 204 may have an exterior support structure for adding resistance. As best seen in Figure 3, the filter 204 is disposed in a cap member 206. The cap element 206 is of largely cylindrical shape, having a lateral wall 206A extending circumferentially and defining an interior volume dimensioned to receive the filter 204. The cap element 206 is dimensioned to fit in the tube element 42 and, in particular, so that the outer surface of the side wall 206A of the element
    206 of the cap is in contact with the interior surface of the element 42 of the tube. The cap element 206 further comprises annular elements 206B disposed along the axial ends of the cap element 206 and extending radially inwardly from the side wall 206A. The annular elements 206B serve to maintain the filter 204 in the cap element 206 in a fixed position. The cap element 206 is made of metal or similar compositions.
    The injector 12 further comprises a ring
    207 retaining element, which is arranged in the tube element 42, upstream of the cap element 206 and in contact therewith, as shown in FIGS. 1 to 3. The retaining element 207 is fixed to the tube element 42, along an interior surface thereof. The retaining ring 207, being fixed in position along the tube element 42, serves to hold elements downstream of the injector 12 in fixed positions in the first part 38 of the body of the injector. In an exemplary embodiment, the retaining ring 207 is welded along the interior surface of the tube member 42. This welded connection is formed along an entire circumference of the upper edge of the retaining ring 207. However, it goes without saying that other connecting mechanisms can be used to fix the retaining ring 207 to the tube element 42.
    [0042]
    Referring to Figures 1 to 4, the injector further comprises a volume reduction element 208, which serves to further reduce the volume of the reducing fluid path in the injector 12. The reduction element 208 and mainly cylindrical in shape, as shown in FIG. 4, having a top end (upstream) and a bottom end (downstream). In one embodiment, the volume reduction member 208 is made of a metal, such as stainless steel. It goes without saying, however, that the volume reduction element 208 can be made of other metals or other metallic compositions. The outer surface of the volume reduction member 208 is sized to come into contact with the inner surface of the tube member 42.
    The volume reduction element 208 further comprises a bore 208A (FIGS. 2 and 3) defined in the axial direction in the volume reduction element 208, going from an axial end (apex) to the other axial end (bottom). The bore 208A is placed along the longitudinal axis of the volume reduction element 208 and forms itself a part of the fluid path for passing the reducer into the injector 12. The bore 208A forms the single fluid path to pass the reducer through or around the volume reduction member 208. In an embodiment given by way of example, the diameter of the bore 208A represents from 12% to 20% of the external diameter of the volume reduction element 208, such as approximately 16%. As the volume reduction element 208 extends radially towards the interior surface of the tube element 42 and as the diameter of the bore 208A is small compared to the outside diameter of the volume reduction element 208, the volume reduction member 208 reduces the space or volume in which the reducing agent can reside in the injector 12 thereby reducing the volume of the reducing fluid path therein. The volume reduction element 208 further facilitates holding the spring adjustment tube 52 in position in the injector 12, so that the spring adjustment tube 52 maintains a desired force on the spring 50, so prevent loss of calibration. More specifically, the retaining ring 207 maintains the position of the filter 204 and of the corresponding cap element 206, which maintains the position of the volume reduction element 208, which maintains the position of the element 52 spring adjustment.
    Referring to Figures 1 to 4, the fluid injector further comprises a volume compensation element 210, which is disposed between the bottom end (upstream) of the reduction element 208 volume and the top of the pole piece 46. The volume compensation element 210 is made of an elastic material and is used to occupy the space between the volume reduction element 208 and the pole piece 46, so as to further reduce the volume of the fluid path of the reducer in The injector 12. The volume compensation element 210 can be in the compressed state in the injector 12 when it is assembled and can be in contact with the volume reduction element 208, the pole piece 46, the inner surface of the tube member 42 and the outer surface of the spring adjusting member 52.
    Figure 5 illustrates part of the downstream end of the fluid injector 12. As can be seen, the seat 56 comprises a bore defined axially in the seat 56. In one embodiment by way of example, the length of the bore passing through the seat 56 is reduced, so as to further decrease the volume of the fluid path of the reducer in the seat 56 and, in particular, the bag volume below the sealing strip of the seat 56, which cooperates with the sealing element 54.
    According to an embodiment given by way of example, the fluid injector 12 comprises a plurality of discs 212 with orifice arranged in a stack. The orifice disc stack is disposed on the downstream end of the seat 56. In the exemplary embodiment, which is illustrated in FIG. 5, the disc stack comprises a first disc 212A having an orifice or more orifices, which are configured to provide the desired spray configuration of a reducer outlet injector 12. It goes without saying that the size and the locations of the orifices of the first disc 212A can vary and depend on the reducer dosage requirements of the passenger vehicle engine. The stack of discs further comprises a second disc 212B, which is arranged downstream of the first disc 212A and which comprises orifices through which the spraying of reducing agent passes. The second disc 212B has a thickness greater than that of the first disc 212A and is arranged on the first disc 212A and supports the first disc 212A, so as to prevent the thinner first disc 212A from deforming under the forces of expansion from frozen reducer upstream of the first 212A disc.
    As mentioned above, the fluid injector 12, and in particular its elements, are configured to reduce the volume of the fluid path of the reducer in the injector 12. In the embodiments given by way of example, the ratio of the volume of the fluid path in the fluid injector 12 to a volume of the injector elements 12 (including but not necessarily limited to the coil 14, the armature 16, the pole piece 46, the tube 52 for adjusting the spring, the element 208 for volume reduction, the element 210 for volume compensation, the filter 204, the retaining ring 207, the spring 50, the element 58 for the spindle, the element 54 seal, the seat 56, the first part 20A of the injector body and the part 40 of the valve body) is between 0.08 and 0.30, and in particular between 0.12 and 0.20, such as about 0.15. These volume quantities are calculated between planes orthogonal to the longitudinal axis of the fluid injector 12 - from a first plane along the open end of the tube element 42 (i.e. along the surface of the second disc 212B (ie the fluid outlet). It goes without saying that the particular volume ratio of the path of the reducer to the volume of the injector elements in the fluid injector may vary depending on a number of factors relating to cost and performance and may take any value between approximately 0.08 and approximately 0.30. Provide a fluid injector having a reduced ratio of the volume of the fluid path of the reducer the volume of the elements of the injector in the fixed range advantageously results in less reducer in the injector 12, which means that the UIR 10 is less likely to be damaged if the reducer in the injector 12 freezes.
    In another embodiment shown in Figures 6 to 8, the fluid injector 12 comprises a volume reduction element 308, which may have many of the characteristics of the volume reduction element 208 mentioned above with reference to FIGS. 1 to 5. Like the volume reduction element 208, the volume reduction element 308 is made of stainless steel or a similar composition, is arranged in the tube element 42 of the injector 12 of fluid between the volume compensation element 210 and the filter 204. However, the volume reduction element 308 comprises a first part 308A and a second part 308B. As shown in Figure 7, each of the first part 308 A and the second part
    308B has a cylindrical shape, the outside diameter of the first 308A being smaller than the outside diameter of the second part 308B. The outside diameter of the first part 308A is smaller than the diameter of the second part 308B by the thickness of the side wall 306A of the cover element 306, as will be explained in more detail below. The volume reduction member 308 includes upper end (upstream) and bottom (downstream) portions, which form the axial ends of the first portion 308A and the second portion 308B, respectively. The outer surface of the second part 308B is dimensioned to come into contact with the inner surface of the tube element 42.
    As mentioned, the outside diameter of the first part 308A of the volume reduction element 308 is smaller than the outside diameter of its second part 308B. As shown in FIGS. 6 to 8, the volume reduction element 308 comprises an angular annular surface or skirt 308D, which extends in an axial direction between the external surface of the first part
    308A and the external surface of the second part 308B and serves as a physical interface between them. The angle of the surface
    Angular 308D, with the longitudinal axis of the volume reduction element 308 and / or the injector 12, is an acute angle. As a variant, the angel of the angular 308D surface is orthogonal to the longitudinal axis of the element
    308 volume reduction and / or injector
    12.
    The volume reduction element 308 further comprises a bore 308C defined in the axial direction in the volume reduction element 308, going from one axial end (vertex) to the other axial end ( background). The bore 308C is placed along the longitudinal axis of the volume reduction element 308 and forms itself a part of the fluid path of the reducer to pass from the reducer into the injector 12, and is the only one fluid path of the reducer passing through or around the volume reduction member 308. In an embodiment given by way of example, the diameter of the bore 308C represents between 12% and 20% of the external diameter of the volume reduction element 308, such as approximately 16%. As the volume reduction element 308 extends towards the interior surface of the tube element 42 and since the relatively small outside diameter of the element the bore 308C is relative to the volume reduction diameter 308, the volume reduction member 308 occupies a certain volume in the injector 12, which decreases the space or the volume of the fluid path of the reducer in the injector 12, thereby reducing the amount of reducer in the injector 12, which could freeze and potentially damage the injector 12.
    The cap element 306 includes a number of the same characteristics as the cap element 206 described above, with reference to FIGS. 1 to 5. As shown in FIG. 7, the cap element 306 is , for the most part, of cylindrical shape with a side wall 306A extending circumferentially and defining an interior volume dimensioned to receive a filter 204. The element 306 of cap is dimensioned to fit in element 42 of tube, and in particular so that the outer surface of the side wall 306A of the cap element 306 is in contact with the inner surface of
    The tube element.
    annular element 306B further comprises a disposed along the axial end (upstream) and the cap element 306 and extending radially inwards from the side wall 306A. The element
    Annular 306B serves to maintain the filter 204 in the cap element 306 in a fixed position. Like the cap element 206, the cap element 306 is made of a metal or of similar compositions and gives a structural support to the filter 204.
    In exemplary embodiments, the cap member 306 cooperates with the volume reduction member 308 and is attached thereto. The filter 204, the cap element 306 and the volume reduction element 308 thus form a single, unitary and integrated component as shown in FIG. 8. Having a single, unitary component formed of the filter 204, of the element 306 of the cap and of the volume reduction element 308 advantageously allows a simpler and less complex operation of assembling the injector 12 during its manufacture.
    In the embodiments given by way of example, a cover element 306 adapts to at least part of a first part 308A of the volume reduction element 308 and cooperates with it or is fixed in another way, as shown in FIGS. 6 and 8. In an embodiment given by way of example, the cap element 306 is force-fitted with the first part 308A. In another exemplary embodiment, the cap member 306 is welded to the first portion 308A, having, for example, a welded load between the bottom surface 306C of the cap member 306 and the radially outer surface of the first part 308 A. In each of these embodiments, the angular surface 308D provides sufficient space to fix the cover element 306 to the first part 308A. It goes without saying that the cap element 306 can be fixed to the first part 308A of the volume reduction element 308 by other mechanisms.
    With the cap element 306, adapting to the first part 308A of the volume reduction element 308, the outside diameter of the side wall 306A is the same or almost the same as the outside diameter of the second part 308A. See Figures 6 and 8.
    [0055]
    As mentioned above, the volume reduction member 308 is made of metal, such as stainless steel, according to an exemplary embodiment. In another embodiment given by way of example, part of the second part 308B is made of plastic or of similar compositions. More specifically, as illustrated in FIGS. 9 to 11, the first part 308A and a first part 308B-1 of the second part 308B are formed from a single metallic element and a second part 308B-2 of the second part 308B is made of material. plastic overmolded around its first part. Figure 11 shows the first metallic part 308A and the first part 308B-1 of the second part 308B. The first part 308B1 of the second part 308B comprises an intermediate segment 308B-3, which moves away from the first part 308Ά in an axial direction (downstream), and a distal segment 308B-4, which is fixed to the segment 308B-3 intermediate and partly in the axial direction (downstream), as shown in FIG. 10. The distal segment 308B-4 extends in the radial direction, further from a longitudinal axis of the volume reduction element 308 ( and / or the injector 12) as the radial extent of the intermediate segment 308B-3 to form a rim. The second part 308B-2 of the second part 308B, in a molded plastic material or in other similar compositions, is formed around the rim formed by the intermediate segment 308B-3 and the distal segment 308B-4, so as to form the volume reduction element 308 in the form of a single, unitary and integrated element. As mentioned above, the volume reduction element 308 is connected to the cap element 306, so as to give the volume reduction element 308, the filter 204 and the cap element forming an element. single assembly to use to assemble the injector 12.
    During the assembly of the injector 12, the single assembly element (filter 204, cap element 306 and element 308 for volume reduction) is inserted into the element 42 of the pressure tube while coming from in contact with the volume compensator 212. After insertion and while still under pressure, the cap member 306 is welded to the tube member 42 along their entire intersection along the top portion of the tube member 42. In one embodiment, the weld is a corner weld.
    [0057]
    The embodiments given by way of example have been described by way of illustration and it goes without saying here that the terminology which has been used is intended to be of the type of description words rather than of limitation. It goes without saying that many modifications and variations of the invention can be made in the light of the above teachings. The above description is given simply by nature by way of example and modifications can be made without departing from the spirit and scope of the invention.
    权利要求:
    Claims (20)
    [1" id="c-fr-0001]
    1. Reducer injection unit (10), characterized in that it comprises:
    a fluid injector (12) having a fluid inlet (30) disposed at a first end of the fluid injector (12) for receiving a reducer, and a fluid outlet (32) disposed at a second end of the fluid injector (12) for discharging the reducer, the fluid injector (12) defining a fluid path for the reducer going from the fluid inlet (30) to the fluid outlet (32), the injector (12) fluid comprising:
    a tube element (42) having one end, disposed at the fluid inlet (30) of the fluid injector (12), the tube element (42) being configured to pass from the reducer, along the path fluid;
    a filter (204) disposed in the tube member (42) near the inlet of the fluid inlet (30) of the fluid injector (12);
    a volume reduction element (202), disposed in the tube element (42) downstream of the filter (204) relative to a direction of flow of the reducer in the fluid path of the inlet (30) fluid at the fluid outlet (32) of the fluid injector (12), the volume reduction member (208) coming into contact with an inner surface of the tube member (42) and comprising a defined bore in the volume reduction element (208), the bore defining at least a portion of the fluid path in the fluid injector (12), the bore having a diameter smaller than an outside diameter of the volume reduction element (208) and the volume reduction element (208) occupying a volume in the tube element (42) so that the volume reduction element (208) reduces a volume occupied by the fluid path for the reducer in the fluid injector (12) and a cap member (206), in which the filter (204) is st arranged, the cap element (206) cooperating with the element (208) of volume reduction and being fixed therein, so that the filter (204), the element (208) of volume reduction and the cap form a unique element.
    [2" id="c-fr-0002]
    2. A reducer injection unit according to claim 1, in which the volume reduction element (208) comprises a first part and a second part, the first part having an outside diameter smaller than an outside diameter of the second part and the cap element (206) cooperates with the first part of the volume reduction element (208).
    [3" id="c-fr-0003]
    3. A reducer injection unit according to claim 2, in which the cap element (206) and the first part of the volume reduction element (208) are made of metal.
    [4" id="c-fr-0004]
    4. reducer injection unit according to claim 2, in which at least a little of the first part of the volume reduction element (208) is disposed in the cap element (206) and an outside diameter of the cap element (206) is equal to the outside diameter of the second part of the volume reduction element (208).
    [5" id="c-fr-0005]
    5. A reducer injection unit according to claim 4, in which the cap element (206) is force fitted with the first part of the volume reduction element (208).
    [6" id="c-fr-0006]
    6. Reducer injection unit according to claim 4, in which the cap element (206) is welded to the first part of the volume reduction element (208).
    [7" id="c-fr-0007]
    The reducer injection unit according to claim 2, wherein the volume reduction member (208) comprises an angular surface between the first part and the second part, the angular surface making an angle, other than an angle. orthogonal, with a longitudinal axis of the volume reduction element (208).
    [8" id="c-fr-0008]
    8. A reducer injection unit according to claim 2, in which the first part and a first part of the second part of the volume reduction element (208) are made of a metallic composition and a second part of the second part. of the volume reduction member (208) is a plastic composition.
    [9" id="c-fr-0009]
    9. A reducer injection unit according to claim 8, in which the second part of the second part of the volume reduction element (208) is overmolded on at least a little of the first part of its second part.
    [10" id="c-fr-0010]
    10. Reducer injection unit according to claim 8, in which the first part of the second part of the volume reduction element (208) defines a flange around which the second part of the second part of the element ( 208) 'volume reduction is molded, the flange being arranged radially inwardly of the outer diameter of the second part of the volume reduction element (208).
    [11" id="c-fr-0011]
    11. A reducer injection unit according to claim 1, in which the cap element (206) comprises a cylindrical shaped side wall, having a first and a second axial end and an annular element, which extends radially towards the interior from the first axial end and in which the second axial end of the cover element (206) is arranged around a part of the volume reduction element (208) and cooperates with it.
    [12" id="c-fr-0012]
    12. Fluid injector (12), comprising:
    a fluid inlet (30), arranged at a first end and configured to receive a fluid, and a fluid outlet (32), arranged at a second end of the fluid injector for discharging the fluid, the injector (12 ) fluid defining a fluid path from the fluid inlet (30) to the fluid outlet (32);
    a tube member (42) having one end, disposed at the fluid inlet (30) of the injector
    (12) of fluid or near it, the element (42) of tube being configured to pass of reducer, next the path fluid; a filtered (204) willing in the tube (42) , at
    proximity to the injector fluid inlet (30)
    (12) fluid; A element (208) of reduction of volume, willing in the tube (42) in downstream of the filter (204), in one meaning flow of fluid going from the ent street (30)
    fluid at the fluid outlet (32) of the fluid injector (12), the volume reduction member (208) being in contact with an inner surface of the tube (42) and comprising a bore defined in the volume reduction element (208), the bore defining at least part of the fluid path in the injector (12) of diameter smaller than an inside diameter of the tube (42) and
    The volume reduction element occupying in the tube (42) a volume such that
    The volume reduction member (208) reduces a volume of the fluid path in the fluid injector (12) and a cap member (206) in which the filter attached to the reduction member volume, so that the filter (204), the volume reduction element (208) and the cap (206) form a single assembly element.
    [13" id="c-fr-0013]
    13.
    Fluid injector (12) according to claim
    12, wherein the volume reduction member (208) includes a first portion and a second portion, the first portion having an outer diameter smaller than an outer diameter of the second portion and the cap member (206) is attached to the first part of the volume reduction element (208).
    [14" id="c-fr-0014]
    14.
    Claim Inj ector
    13, in which the first part of the volume reduction element is arranged in the cap (206) and an outside diameter of the cap element (206) is equal to the outside diameter of the second
    [15" id="c-fr-0015]
    15.
    volume reduction.
    Fluid injector (12) according to claim
    13, in which by force with the first
    [16" id="c-fr-0016]
    16.
    volume reduction.
    fluid according to claim
    13, in which
    The cap member (206) is welded (208) for volume reduction.
    [17" id="c-fr-0017]
    17. Fluid injector (12) according to claim
    13, wherein the volume reduction member (208) comprises an angular surface between the first part and the second part, the angular surface making an angle other than an angle, which is orthogonal, with the longitudinal axis of the 'volume reduction element (208).
    [18" id="c-fr-0018]
    18. Fluid injector (12) according to claim
    13, in which the first part and a first part of the second part of the volume reduction element (208) are made of a metallic composition and a second part of the second part of the volume reduction element (208) is made of a plastic material.
    [19" id="c-fr-0019]
    19. Fluid injector (12) according to claim
    18, in which the second part of the second part of the volume reduction element (208) is overmolded onto a little of the first part of the second part of the volume reduction element (208), the first part of the second part of the volume reduction element (208) defining a flange around which the second part of the second part of the volume reduction element (208) is molded, the flange being arranged radially inwards the outside diameter of the second part of the volume reduction element (208).
    [20" id="c-fr-0020]
    20. Fluid injector (12) according to claim
    12, in which the fluid injector (12) forms part of a reducer injection unit and in which the cover element (206) comprises a cylindrical shaped side wall, having first and second axial ends and an annular member, which extends radially inward from the first axial end and wherein the second axial end of the cap member (206) is disposed around a portion of the member (208 ) volume reduction and cooperates with it.
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    同族专利:
    公开号 | 公开日
    CN109505683B|2021-05-28|
    CN109505683A|2019-03-22|
    US10502112B2|2019-12-10|
    US20190078486A1|2019-03-14|
    FR3071009B1|2021-04-30|
    KR102127049B1|2020-06-25|
    JP6661719B2|2020-03-11|
    DE102018215673A1|2019-03-14|
    KR20190030633A|2019-03-22|
    JP2019056373A|2019-04-11|
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    法律状态:
    2019-09-26| PLFP| Fee payment|Year of fee payment: 2 |
    2020-08-07| PLSC| Search report ready|Effective date: 20200807 |
    2020-09-14| PLFP| Fee payment|Year of fee payment: 3 |
    2021-09-21| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    US15704294|2017-09-14|
    US15/704,294|US10502112B2|2017-09-14|2017-09-14|Injector for reductant delivery unit having fluid volume reduction assembly|
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