• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Valve plate assembly. A valve plate assembly (1) of a hydraulic axial piston machine is described, the valve plate assembly comprises a wear plate (2) made of a ceramic material surrounded by a compression ring (4). This type of valve plate assembly must be profitably produced and maintained. To this end, the wear plate (2) is connected to a support plate (3) by means of the compression ring (4). (Machine-translation by Google Translate, not legally binding)
    公开号:ES2835079A1
    申请号:ES202030923
    申请日:2020-09-11
    公开日:2021-06-21
    发明作者:Andersen Stig Kildegaard；Iversen Frank Holm
    申请人:Danfoss AS；
    IPC主号:
    专利说明:

    [0002] Valve plate assembly
    [0004] The present invention relates to a valve plate assembly of an axial piston machine comprising a wear plate made of a ceramic material surrounded by a compression ring.
    [0006] This type of valve plate assembly is known, for example, from US 10 094364 B2.
    [0008] In a hydraulic axial piston machine a cylinder block rotates in a housing. The cylinder block is supplied with several cylinders. In each cylinder a piston is movable up and down. One end of the piston supports a sliding shoe that slides on a swash plate and is held in contact with the swash plate by means of retainer means. At the other end of the cylinder drum a valve system is arranged. The valve system comprises a rotary valve plate assembly with the cylinder block and a stationary part that is attached to the housing.
    [0010] When using oil as the hydraulic fluid, there is usually no problem with friction between moving parts. However, when using liquids that have no lubricating effect, such as water, the friction problem has to be solved by other means.
    [0012] One possibility is to use special plastic materials, such as PEEK (Polyetheretherketone). However, a plastic material is not very resistant to wear caused by particles in the pumped fluid.
    [0014] To overcome this problem, it is attractive to form the tribological surface of a ceramic material with high wear resistance and low coefficient of friction under fluid lubrication conditions.
    [0016] However, it is difficult to bring the ceramic material into the desired shape.
    [0018] The object underlying the invention is to cost-effectively produce and maintain a valve plate assembly of a hydraulic axial piston machine.
    [0020] This object is solved in that the wear plate is connected to a support plate by means of the compression ring.
    [0022] In this type of arrangement the wear plate can be made very flat to ensure good sealing, low friction and low wear in the sliding contact between the valve plate assembly and the stationary part of the valve system. Plate wear is relatively resistant to wear caused by particles in the pumped fluid. What's more, the wear plate is resilient against thermal shocks that can occur, for example, when a cold machine is started and is suddenly filled with hot water or other liquid from pipes that have been heated by meteorological conditions of heat and light. direct solar. The valve plate assembly can also absorb an axially directed force from the cylinder block towards the stationary part of the valve system, e.g. ex. originated from the springs that push the retainer means towards the swash plate. What's more, the valve plate assembly is a wear part. If wear occurs, the repair should be as cheap as possible. Thus, it is an advantage that it is not necessary to replace the entire rotary part of the valve system, but only the wear plate.
    [0024] In one embodiment of the invention the compression ring comprises a clamping geometry that accommodates clamping means connecting the compression ring to the support plate. The fixing geometry can be, for example, a hole having an internal thread so that the compression ring can be fixed to the support plate by means of screws or bolts. The compression ring not only protects the ceramic wear plate against rapid pressure changes and high internal pressure that could cause high tensile stresses and destroy an unprotected ceramic wear plate, but is also used for the connection of the wear plate. wear ceramic to backing plate.
    [0025] In one embodiment of the invention push plates are attached to the support plate on a side opposite the wear plate, where the push plates end at the support plate. The thrust plates form a connection between the cylinders in the cylinder block and the support plate, so that liquid can flow to or from the cylinders without leakage between the support plate and the cylinder block.
    [0027] In one embodiment of the invention the push plates abut against a stop surface on the support plate. In other words, the push plates can be inserted into a stepped hole. This gives a defined position of the push plates on the support plate. Hydraulic pressures acting on the push plates can be transferred to the backing plate.
    [0029] In one embodiment of the invention the support plate comprises several first openings and the wear plate comprises several second openings, wherein the shape of the first openings differs from the shape of the second openings. The first openings and the second openings are through openings and form a fluid passage through the respective plates. When the shape of the first openings differs from the shape of the second openings, it is possible to choose a simple shape for the second openings in the ceramic wear plate which makes the production of the wear plate simple and cost effective.
    [0031] In one embodiment of the invention the first openings have a cross section that changes in an axial direction of the support plate and the second openings have a constant cross section. The constant cross section facilitates the production of the wear plate. The variable cross section of the first aperture allows a transition from the cylindrical push plates to another cross section that matches the cross section of the second apertures.
    [0033] In one embodiment of the invention, sealing means are provided between the support plate and the wear plate. The sealing means can be in the form of O-rings. The sealing means prevents a leak between the wear plate and the support plate.
    [0034] In one embodiment of the invention each of the sealing means is arranged in a groove surrounding the first opening, where an area limited by the sealing means is non-circular in shape. The non-circular shape can be, for example, a section of a circular ring. This is an advantage when the second openings in the wear plate are also in the form of sections of a circular ring. Furthermore, when the area is extended in the circumferential direction over the respective first openings, a uniform distribution of the contact pressure can be achieved between the valve plate assembly, that is, the rotating part of the valve system and the stationary part. valve system.
    [0035] In one embodiment of the invention the area limited by the sealing means is less than an area defined by a push plate on the opposite side of the support plate. Thus, hydraulic forces from the areas between the wear plate and the push plates are slightly smaller than the hydraulic forces from the push plates. This means that the net effect of hydraulic forces is to keep the support plate slightly pressed against the wear plate, that is, the pressure does not generate a separating force between the support plate and the wear plate. Due to this design the support plate and the wear plate can be held together easily with weak connection means, such as three small screws that engage in threaded holes in the compression ring. These screws also serve to correctly position the wear plate relative to the support plate.
    [0036] In one embodiment of the invention the support plate comprises an elastically deformable spring section. The spring section is in one part with the support plate. The spring section acts between the support plate and the cylinder block. The spring section ensures that the contact force between the cylinder block and the support plate is transferred to the support plate in a well distributed manner that can be made almost symmetrical around the axis of rotation of the cylinder block, even if the cylinder block has a slight misalignment with respect to the stationary part of the valve system.
    [0038] In one embodiment of the invention the spring section is machined from the support plate. The spring section can be produced, for example, by turning.
    [0040] A preferred embodiment of the invention will now be described in more detail with reference to the drawings, in which:
    [0042] Figure 1 shows a valve plate assembly,
    [0044] Figure 2 shows a support plate,
    [0046] Figure 3 shows a sectional view of the valve plate assembly,
    [0047] Figure 4 shows the valve plate assembly in connection with a cylinder block, and
    [0049] Figure 5 shows an enlarged view of a part of the valve plate assembly.
    [0050] Figure 1 shows a valve plate assembly 1 of a hydraulic axial piston machine. The valve plate assembly 1 comprises a wear plate 2 made of a ceramic material and a support plate 3 made of another material. The support plate 3 can be made, for example, of a metallic material such as steel or stainless steel.
    [0052] The wear plate 2 is surrounded by a compression ring 4. The compression ring 4 preloads in compression the wear plate 2. The compression ring 4 fits over the wear plate 2. The heavy preload ensures that no stresses occur significant tensile stress on wear plate 2 due to pressure loads or thermal shock.
    [0053] The compression ring 4 comprises several fixing geometries 5. The fixing geometries 5 can be in the form of screw holes, that is, holes having an internal thread. The compression ring 4 can be connected to the support plate 3 by means of screws 6. In the embodiment shown in Figure 1 the locking geometry 5 is a through hole. However, this is not necessary. It can also be a knockout.
    [0055] The support plate 3 similarly has some holes 7 through which the screws 6 can be pushed. The screws 6 can be quite weak. They are only necessary to fix the combination of wear plate 2 and compression ring 4 to the support plate 3 and to correctly position the wear plate 2 with respect to the support plate 3. They are not required to withstand greater forces as will be explained then.
    [0057] Figure 3 shows the valve plate assembly 1 in cross-sectional view.
    [0058] The push plates 8 are fixed on the carrier plate 3 on a side opposite the wear plate 2. The push plates 8 are pressed into the carrier plate with interference fit. The push plates 8 deform plastically when pressed and thereby absorb production tolerances in the push plates 8 and the backing plate 3.
    [0060] As can be seen in Figure 4 and 5 the push plates 8 are inserted into a cylinder 9 which is provided in a cylinder block 10. The valve plate assembly 1 is fixed to the cylinder block 10 through the insertion of thrust plates in the cylinders and rotates together with the cylinder block 10. A stationary part of a valve system and a housing in which the cylinder block 10 is arranged is not shown. The cylinder block 10 is connected to a stem 11.
    [0062] The wear plate 2 comprises a central opening 12 and the support plate 3 comprises a central opening 13 so that the stem 11 can be guided through the valve plate assembly 1.
    [0064] The push plates 8 are circular in shape. Thus, the support plate 3 comprises first openings 14 which are circular in shape on one side 15 of the support plate 3 facing away from the wear plate 2. However, as can be seen in Figure 2, the first openings 14 have another shape on one side 16 of the support plate 3 facing the wear plate 2. The shape of the first openings 14 on the side 16 corresponds to a section of an annular ring. Thus, the cross section of the first openings 14 varies in the axial direction, that is, in a direction parallel to the axis of rotation of the cylinder block 10.
    [0065] The wear plate 2 comprises a corresponding number of second openings 17. The shape of the second openings 17 corresponds to the shape of the openings 14 on the side 16 and corresponds to a section of an annular ring. The cross section of the second openings 17 is constant in the axial direction, so that it is quite simple to produce the wear plate 2.
    [0067] As can be seen in Figure 2, the support plate 3 comprises a groove 18 around each first opening 14. In the groove 18 sealing means 19 are arranged, for example in the form of an O-ring. The sealing means 19 ensure a tightness between the wear plate 2 and the support plate 3.
    [0069] The sealing means 19 limit a first area 20 on the side 16 of the support plate 3. This first area is slightly smaller than a second area defined by the push plates 8. This second area corresponds to the diameter of the cylinder 9. Thus, the push plates 8 generate hydraulic forces that push against the support plate 3. To this end, the support plate 3 comprises a stop 21 at each first opening 14 and the push plates 8 rest against the stop 21. The The size of the first area 20 and the sectional area of the cylinder 9 is designed so that the hydraulic pressure almost balances the forces from the thrust plates 8 on the support plate 3. Thus, there are no separating forces between the plate of wear plate 2 and support plate 3. On the contrary, support plate 3 is slightly pressed in a direction to wear plate 2.
    [0071] Furthermore, the size and shape of the first areas 20 is designed to achieve a uniform distribution of the contact pressure between the valve plate assembly 1 and the stationary part not illustrated of the valve system.
    [0073] The support plate 3 comprises a spring section 22. The spring section 22 is machined from the support plate 3, for example by turning. The spring section 22 comprises an edge 23 that rests against a protrusion 24 in the cylinder block 10. The edge 23 is connected to a radially outer portion of the support plate 3 by means of a hinge section 25. The hinge section Spring 22 integrates into the center of support plate 3 and surrounds stem 11. Spring section 22 ensures that the contact force between cylinder block 10 and support plate 3 is transferred to support plate 3 in a well distributed manner that is nearly symmetrical about the axis of rotation of cylinder block 10, even if cylinder block 10 has a slight misalignment with respect to the stationary part of the valve system.
    [0074] The component that accommodates most of the functions of the rotary part of the valve system, that is, of the valve plate assembly 1, is made of the support plate 3 which is made of a metallic material that is much easier to work with. machining to complex geometries than a ceramic material and which can also withstand tensile stresses much better than the ceramic material of the wear plate 2. The wear plate 2 can be quite simple in shape and can be produced cost-effectively.
    [0076] Wear plate 2 is a wear part that can be easily replaced by simply loosening screws 6 by removing wear plate 2 together with compression ring 4 and fitting a new set of wear plate 2 and compression ring 4 .
    [0077] Thus, maintenance is also profitable.
    权利要求:
    Claims (11)
    [1]
    1. Valve plate assembly of a hydraulic axial piston machine, the valve plate assembly (1) comprises a wear plate (2) made of a ceramic material surrounded by a compression ring (4), characterized by that the wear plate (2) is connected to a support plate (3) by means of the compression ring (4).
    [2]
    Valve plate assembly according to claim 1, characterized in that the compression ring (4) comprises a fixing geometry (5) that accommodates fixing means (6) connecting the compression ring (4) to the plate support (3).
    [3]
    Valve plate assembly according to claim 1 or 2, characterized in that thrust plates (8) are attached to the support plate (3) on a side opposite the wear plate (2), wherein the plates thrust (8) end on the support plate (3).
    [4]
    Valve plate assembly according to claim 3, characterized in that the thrust plates (8) abut against a stop surface (21) on the support plate (3).
    [5]
    Valve plate assembly according to any one of claims 1 to 4, characterized in that the support plate (3) comprises several first openings (14) and the wear plate (2) comprises several second openings (17), wherein the shape of the first openings (14) differs from the shape of the second openings (17).
    [6]
    Valve plate assembly according to claim 5, characterized in that the first openings (14) have a cross section that changes in an axial direction of the support plate (3) and the second openings (17) have a cross section constant.
    [7]
    Valve plate assembly according to claim 5 or 6, characterized in that sealing means (19) are arranged between the support plate (3) and the wear plate (2).
    [8]
    Valve plate assembly according to claim 7, characterized in that each of the sealing means is arranged in a groove surrounding the first opening, where an area limited by the sealing means is non-circular in shape
    [9]
    Valve plate assembly according to claim 8, characterized in that the area (20) is smaller than an area defined by a push plate (8) on the opposite side of the support plate (3).
    [10]
    Valve plate assembly according to any one of claims 1 to 9, characterized in that the support plate (3) comprises an elastically deformable spring section (22).
    [11]
    Valve plate assembly according to claim 10, characterized in that the spring section (22) is machined from the support plate (3).
    类似技术:
    公开号 | 公开日 | 专利标题
    ES2582394T3|2016-09-12|Cladding coupling pin
    US7878509B2|2011-02-01|Mechanical seal device
    ES2690533T3|2018-11-21|Mechanical seal
    ES2373010T3|2012-01-30|VALVE.
    US20090200749A1|2009-08-13|Mechanical seal device
    US6918593B2|2005-07-19|Mechanical seal device
    US8746657B2|2014-06-10|Multi-piece valve disk
    EP1950475A1|2008-07-30|Mechanical seal device
    ES2835079A1|2021-06-21|Valve plate assembly |
    FI101570B|1998-07-15|Arrangements in shut-off valves
    BRPI0911274B1|2019-12-03|internally pressurized seal assembly
    US6179590B1|2001-01-30|Scroll fluid apparatus having axial adjustment mechanisms for the scrolls
    RU2482366C2|2013-05-20|Spindle support
    RU155805U1|2015-10-20|GATE VALVE
    EP1887265B1|2012-07-11|Mechanical seal device
    ES2785949T3|2020-10-08|Rotating union arrangement with pressure actuated rotary union as well as rotary union
    CN104929714A|2015-09-23|Air valve timing controller
    US20080106045A1|2008-05-08|Decoupled shaft seal for a progressive cavity pump stuffing box
    US4799647A|1989-01-24|Valve assembly for controlling fluid flow
    CN111434895B|2022-03-04|Sleeve of phase adjuster of camshaft and phase adjuster of camshaft
    CN110520602B|2021-12-07|Adapter for engine roller lifter and engine roller lifter assembly including the same
    CN109424747B|2020-06-26|Sealing device for rotary machine
    AU2016219663B2|2017-11-23|Air supply system for a drill rig
    RU203482U1|2021-04-07|Seated ball valve without pressure ring
    RU2234629C2|2004-08-20|Valve head
    同族专利:
    公开号 | 公开日
    DE102019135086A1|2021-06-24|
    GB202019704D0|2021-01-27|
    CN113007054A|2021-06-22|
    GB2592470A|2021-09-01|
    US20210190066A1|2021-06-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1993014298A1|1992-01-15|1993-07-22|Caterpillar Inc.|An axial piston fluid translating unit with sealed barrel plate|
    US5752428A|1993-12-08|1998-05-19|Danfoss A/S|Hydraulic axial piston motor|
    US20040216601A1|2003-02-03|2004-11-04|Kenji Matsumoto|Rotating fluid machine|
    EP1748187A2|2005-07-26|2007-01-31|Honeywell International Inc.|Wear resistant port plate for a fluid transfer device|
    US20160273525A1|2013-11-13|2016-09-22|Eco-Sistems Watermakers, S.L.|Hydraulic axial piston pump having a floating rotatory drum|
    DE2049003A1|1970-10-06|1972-04-13|Wenjukowsky Armaturny Sawod|Control and shut-off valve|
    DE9416848U1|1994-10-19|1995-01-12|Brueninghaus Hydromatik Gmbh|Hydrostatic axial piston machine with a cylinder block rotatably supported by means of a sliding disc made of bearing material|
    DE19525852B4|1995-07-15|2004-07-15|Danfoss Analytical A/S|Axial piston micropump|
    JP2004239069A|2003-02-03|2004-08-26|Honda Motor Co Ltd|Rotary fluid machinery|
    US9249888B2|2014-01-17|2016-02-02|Ge Oil & Gas Pressure Control Lp|Non-welded hardface gate and seats|
    US10094364B2|2015-03-24|2018-10-09|Ocean Pacific Technologies|Banded ceramic valve and/or port plate|
    法律状态:
    2021-06-21| BA2A| Patent application published|Ref document number: 2835079 Country of ref document: ES Kind code of ref document: A1 Effective date: 20210621 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102019135086.7A|DE102019135086A1|2019-12-19|2019-12-19|Valve plate assembly|
    [返回顶部]