• 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:
    A scroll expansion device comprises a driving scroll body having a first axis line, a driven scroll body having a second axis offset from the first axis line, a carrier plate comprising two plates coupled to the driven scroll body and to the second axis line. a cylindrical driving pin connected to the driving scroll body, and a cylindrical guide ring connected to the support plate and having an inner diameter greater than an outer diameter of the driving pin. The driving pin includes an outer peripheral surface in contact with an inner peripheral surface of the guide ring. A hard layer comprising diamond-like carbon is formed on the outer peripheral surface of the driving pin. The inner peripheral surface of the guide ring comprises a polymer resin material that is self-lubricating.
    公开号:BE1023409B1
    申请号:E2015/5693
    申请日:2015-10-27
    公开日:2017-03-09
    发明作者:Tamotsu Fujioka；Atsushi Unami；Hiroshi Ito；Takaaki Izumi
    申请人:Anest Iwata Corporation；
    IPC主号:
    专利说明:

    SCROLL EXPANSION DEVICE TECHNICAL FIELD
    The present invention relates to a scroll expansion device to which steam is supplied as working medium.
    BACKGROUND
    Scroll fluid inchines compress or expand a working medium by relative movement between scroll bodies including helical wrappers. A scroll expansion device is a type of scroll fluid injector. The scroll expansion device comprises an expansion chamber formed by a pair of scroll bodies. The scroll expansion device converts energy into rotational energy through expansion of a high pressure working medium in the expansion chamber. As a technology in such a field, a scroll expansion device such as described in JP 2011-252434 A is known.
    The scroll expansion device described in JP 2011-252434 A comprises a fixed scroll and a bypass scroll. Since rotational movement of this bypass scroll is regulated by a rotation-regulating mechanism, only one revolution movement can be performed. SUMMARY
    Now, small power generating facilities have recently been considered. Since a scroll expansion device has less variation in torque and a comparatively simple device configuration, it is expected that a scroll expansion device as a device can be suitably applied in small power generating facilities. An example of an energy source to be used as input for the small power generating facility includes steam emitted by power stations and the like. The steam partially condenses in an expansion process. Condensation tends to prevent a preferred rotation state between rotating components that use lubricating oil. Furthermore, a bearing is sometimes used to support the rotating components. When the number of bearings increases, mechanical energy loss often increases. Therefore, a rotating machine such as the scroll expansion device requires a reduction in the number of bearings, each having a roller element, and maintaining a preferred rotational state between the rotating components in terms of reducing energy loss.
    The present invention has been made in consideration of the problem described above. An object of the present invention is to provide a scroll expansion device that can maintain a preferred rotation state.
    An embodiment of the present invention includes a scroll expansion device to which steam is supplied as working medium. The scroll expansion device includes a driving scroll body that includes a pair of driving end plates and a driving coil formed on each of the pair of driving end plates, and has a first axis as a pivot axis; comprises a driven scroll body comprising a driven end plate and a driven winding formed on each of both surfaces of the driven end plate, which is placed between the pair of driving end plates and which, as a pivot axis, has a second axis that is offset by relative to the first axis; comprises a carrier plate positioned so that the driven scroll body is inserted, which comprises a pair of plates coupled to the driving scroll body, and which has a second axis as a rotary axis; comprises a cylindrical driving pin connected to the driving scroll body and projecting from the driving end plate toward the support plate; and comprises a cylindrical guide ring connected to the support plate, and comprising an inner diameter greater than an outer diameter of the driving pin. A layer comprising diamond-like carbon is formed on an outer peripheral surface of the driving pin in contact with an inner peripheral surface of the guide ring. The inner peripheral surface of the ring comprises a polymeric resin material that is self-lubricating.
    The scroll expansion device according to an embodiment of the present invention comprises the driving pin and the guide ring. The driving pin and the guide ring regulate the relative rotational movement of the driven scroll body relative to the driving scroll body. Then, in a state where the outer peripheral surface of the driving pin is in close contact with the inner peripheral surface of the guide ring, a sliding occurs in a tangent direction of the inner peripheral surface or the outer peripheral surface, between the outer peripheral surface of the driving pin and the inner peripheral surface of the guide ring. This sliding allows relative rotational movement of the driven scroll body relative to the driving scroll body. According to this configuration, the scroll expansion device does not need a bearing including a rolling element to define relative movement between the driven scroll body and the driving scroll body. Therefore, the scroll expansion device can suppress an increase in mechanical energy loss. Furthermore, the diamond-like carbon layer is formed on the outer peripheral surface of the driving pin. The inner peripheral surface comprises the polymeric resin material that is self-lubricating. A preferred sliding state is achieved by the contact between the layer comprising diamond-like carbon and the polymeric resin material that is self-lubricating. Furthermore, if condensate is present in a space between the driving pin and the guide ring, a coefficient of friction between the driving pin and the guide ring reduces. As a result, the increase in mechanical energy loss is further suppressed. Therefore, the scroll expansion device according to this embodiment of the present invention can maintain a preferred rotation state.
    In one embodiment, the driving pin may comprise a condensation-providing portion. The condensate-supplying portion can supply condensate formed by condensation of steam to the space between the driving pin and the guide ring. Since this condensate-supplying portion supplies condensate to the space between the driving pin and the guide ring, a lubrication state between the driving pin and the guide ring becomes advantageous. Therefore, the condensate-providing portion can suitably suppress the increase in mechanical energy loss associated with relative rotational movement between the driving scroll body and the driven scroll body.
    In one embodiment, at least one of the driving pin and the guide ring may comprise a condensate-containing portion. The condensate-containing portion can hold condensate formed by the condensation of steam in the space between the driving pin and the guide ring. This condensate-containing portion holds condensate in the space between the driving pin and the guide ring. The condensate can contribute to an advantageous lubrication state between the driving pin and the guide ring. Therefore, the condensate-containing portion can appropriately suppress the increase in the mechanical energy loss associated with relative rotational movement between the driving scroll body and the driven scroll body.
    A scroll expansion device according to an embodiment of the present invention can maintain a preferred spin condition.
    BRIEF DESCRIPTION OF THE FIGURES
    FIG. 1 is a sectional view of a scroll expansion device according to an embodiment of the present invention;
    FIG. 2 is a front view of the placement of a driving pin and a guide ring; FIG. 3 is an enlarged sectional view showing the driving pin and the guide ring;
    FIG. 4A to 4C are enlarged cross-sections showing a driving pin and a guide ring of a scroll expansion device according to a modification. DETAILED DESCRIPTION.
    An embodiment of the present invention will be described below with reference to the accompanying drawings. In descriptions of the drawings, the substantially same elements are designated with the same reference marks, and unnecessary repetition of their description will be omitted.
    As shown in FIG. 1, a power generating system 100 comprising a scroll expansion device 1 drives a dynamo 101 by using the scroll expansion device as a power source. A wake-up medium-supplying portion 102 supplies steam V as a working medium to the scroll expansion device 1. Examples of steam V include water vapor, and a cooling agent used in a rankin cycle. The scroll expansion device 1 converts energy that appears with expansion of the supplied steam V in the scroll expansion device into rotation energy. The scroll expansion device 1 transmits the rotation energy to the dynamo 101 via a drive shaft. The steam V is ejected after the expansion to the outside of the scroll expansion device 1.
    A temperature of the steam V to be emitted is lower than that of the steam V to be supplied. The scroll expansion device 1 extracts, as rotation energy, energy corresponding to a difference between the temperature of the steam V supplied and the temperature of the steam emitted V.
    The scroll expansion device 1 comprises, as main components, a housing 2, an input drive shaft 3, an output drive shaft 4, a driving scroll body 6, a driven scroll body 7, a support plate 8, and a engaging mechanism 9.
    The housing 2 comprises a pair of cabinets 11 and 12. The housing 2 forms a housing space S1. The housing space S1 accommodates the driving scroll body 6, the driven scroll body 7, the support plate 8 and the engaging mechanism 9. The housing 11 comprises a shaft hole 11a. The input drive shaft 3 is inserted into the shaft hole 1a. A central axis of the shaft hole 1a defines a first axis A1. A driving bearing 1 lb and a driving bearing are placed in the housing 11. The driving bearing 1 lb pivotally supports the input drive shaft 3. The driving bearing 1 lc supports the bearing plate 8. A central axis of the driving bearing 1 lb corresponds to the first axis Al. Meanwhile, a central axis of the driven bearing 1 lb corresponds to a second axis line A2. The second axis A2 is offset by a distance t with respect to the first axis A1. The second axis A2 is defined by a central axis of a bearing section 11f. The driven bearing 1 lc is fitted in the bearing-holding part 1 lf. A cap 13 is connected to an opening end member of the cabinet 11. The cap 13 serves as an interface with the working medium supplying portion 102. In a direction of a first axis Al, an oil seal 13 is placed between the driving bearing 11b and the opening end 1 ld. The case 12 has essentially the same structure as case 11. That is to say, the case 12 includes the shaft hole 11a. The driving bearing 1 lb and the driven bearing 1 lc are placed in the case 12. In addition, case 12 comprises an outlet 1 Ie. The outlet 1ee ejects the steam V after the expansion.
    The input drive shaft 3 is inserted into the shaft hole 11a of case 11. Therefore, a pivot axis of the input drive shaft 3 corresponds to the first axis Al. An end of the input drive shaft 3 is connected to the driving scroll body 6. The input drive shaft 3 comprises a working medium introducing hole 3d. The steam V is introduced through the working medium introducing hole 3a. The working medium introducing hole 3a penetrates from one end to the other end of the input drive shaft 3. The output drive shaft 4 is inserted into the shaft hole 11a of case 12. Therefore, a pivot axis of the output drive shaft 4 corresponds to the first axis Al. One end of the output drive shaft 4 is connected to the driving scroll body 6. In addition, the other end of the output drive shaft 4 is coupled to the dynamo 101.
    The housing space S1 accommodates the driving scroll body 6. The driving scroll body 6 is rotatable about the first axis line A1. The driving scroll body 6 comprises a pair of driving end plates 16 and a pair of driving wrappers 17. Each of the pair of driving end plates 16 comprises a disc-like shape. An outer circumferential edge portion 16c of one of the driving end plates 16 is coupled to the outer circumferential edge portion 16c of the other driving end plate 16. The input drive shaft 6 is connected to an outer surface 16a of the one driving end plate 16. Furthermore, the one driving end plate comprises 16 a working medium introducing hole 16b. The steam V is introduced through the working medium introducing hole 16b. The working medium introducing hole 16b communicates with the working medium introducing hole 3a of the input drive shaft 3. The output drive shaft 5 is connected to the outer surface 16a of the other driving end plate 16. The driving winding 17 is formed on an inner surface 16d of the driving end plate 16 The driving wrapper 17 comprises a helical shape or a spiral shape. The driving wrappers 17 are thus placed between the pair of driving end plates 16. The above-described input drive shaft 3 and the above-described output drive shaft 4 are integrally formed by the driving scroll body 6. The input driving shaft 3, the output driving shaft 4, and the driving scroll body 6 rotate integrally around the first axis Al.
    The housing space S1 accommodates the driven scroll body 7. The driven scroll body 7 is rotatable about the second axis A2. The driven scroll body 7 comprises a driven end plate 18 and a driven wrapper 19. The driven end plate 18 comprises a disc-like shape. The driven end plate 18 is placed between the driving end plates 16 of the driving scroll body 6. The driven end plate 18 is coupled to the carrier plate 8. The driven winding 19 is formed on each surface of the driven end plate 18 in a direction in the direction of the driving end plates 16. The driven winding 19 comprises a helical shape or a spiral shape. The driving end plates 16, the driven end plate 18, the driving wrappers 17 and the driven wrappers 19 form an expansion chamber S2. The expansion chamber S2 for expanding the steam V comprises a helical shape or a spiral shape.
    The carrier plate 8 rotatably supports the driven scroll body 7 around the second axis A2. The carrier plate 8 comprises a pair of plates 21. The plates 21 each have a substantially disc-like shape. In one direction of the first axis line A1 (or the second axis line A2), one of the pair of plates 21 is placed between the one driving end plate 16 and the case 11. The other plate 21 is placed between the other driving end plate 16 and the case 12 The carrier plate 8 is thus positioned so that the driving scroll body 6 and the driven scroll body 7 are inserted. An outer circumferential edge portion of the plate 21 is coupled to an outer circumferential edge portion of the driven end plate 18. The plate 21 includes a pivot axis portion 21a. A rotatable central shaft of the rotary axis portion 21a is the second axis A2. The pivot axis portion 21a is formed on the side of a surface of the plate 21, this surface facing the case 11. The rotary shaft portion 21a fits into the driven bearing 1 lc. Therefore, the support plate 8 and the driven scroll body 7 rotate around the second axis A2. This driven scroll body 7 is coupled to the support plate 8.
    The engaging mechanism 9 provides for engaging the driving scroll body 6 and the driven scroll body 7. Specifically, the engaging mechanism 9 ensures the synchronous rotation of the driving scroll body 6 and the driven scroll body 7. The engaging mechanism 9 comprises a driving pin 22 and a guide ring 23. The driving pin 22 is connected to the driving scroll body 6. The guide ring 23 is connected to the support plate 8. As shown in FIG. 2, the scroll expansion device 1 comprises three pairs of engaging mechanisms 9. The three pairs of engaging mechanisms 9 are positioned at substantially equal intervals along a circumference direction of a circle about the first axis A1. Each of the three pairs of engaging mechanisms 9 is placed on a virtual axis parallel to the first axis A1. One of the pair of engaging mechanisms 9 is positioned on the side of the input drive shaft 3. The other of the pair of engaging mechanisms 9 is arranged on the side of the output driving shaft 4.
    As shown in FIG. 3, one end side of the driving pin 22 is connected to the driving end plate 16 of the driving scroll body 6. The other end side of the driving pin is located inside the guide ring 23. The driving pin 22 comprises a pin portion 24 and a flange portion 26 The pin portion 24 comprises a column shape extending along the direction of the first axis Al. The flange portion 26 is formed on the other end side of the driving pin 22. The pin portion 24 and the flange portion 26 are integrally formed. The driving pin 22 comprises a metallic material (e.g. SUS303 material). An end of the pin portion 24 is fitted into a cavity portion of the driving end plate 16. The flange portion 26 is secured to the outer surface 16a of the driving end plate 16 by, for example, a bolt. The other end side of the pin portion 24 is disposed within the guide ring 23.
    An outer peripheral surface 22s on the other end side of the pin portion 24 comes into contact with an inner peripheral surface 23a of the guide ring 23. The outer peripheral surface 22s comprises a hard layer 27. The hard layer 27 is formed of an amorphous material substantially a hydrocarbon or an isotope of carbon. Specifically, the hard layer 27 is formed from diamond-like carbon (DLC). The hard layer has a thickness of 1 μτη or more and 5 pm or less, for example. The hard layer 27 comprising diamond-like carbon provides spreadability and wear resistance to a contact portion of the driving pin 22 with the guide ring 23. The hard layer 27 may further comprise other components as an added material other than the hydrocarbon or the isotope main component. For example, a plasma CVD method or a PVD method can be used to form the hard layer 27.
    The driving pin 22 includes a condensate-supplying hole 22a as a condensate-supplying portion. The condensate-providing hole 22a guides the steam V or the condensate to the inside of the guide ring 23. The condensate-providing hole 22a supplies the condensate to a space between the guide ring 23 and the driving pin 22. When the steam V is water vapor, is the condensate water. The condensate-supplying hole 22a is a through hole that goes from one end surface to the other end surface of the pin portion 24. The one end side of the pin portion 24 is fitted into the driving end plate 16. The condensate-supplying hole 22a communicates with a condensate-supplying hole 16e of the driving end plate 16 on one side of the pin portion 24. The expansion chamber S2 is connected to the inside of the guide ring 23 via the condensate-supplying hole 16e and the condensate-supplying hole 22a. As a result, the steam V or the condensate from the expansion chamber S2 is introduced into the inside of the guide ring 23. Note that the steam V is preferably introduced into the guide ring after the expansion. Therefore, the condensate-supplied hole 16e of the driving end plate 16 may be provided at a position that communicates with a space S2a formed of the driving winding 17. The space S2a is a space between an outer circumferential driving winding portion 17a of the driving scroll body 6 and a driving winding portion 17b adjacent to the driving winding portion 17a. In addition, the driving pin 22 which connects the condensate-supplying hole 22a that communicates with the condensate-supplying hole 16e at the same position as the condensate-supplying hole 16e on the driving end plate 16. Specifically, the driving pin 22 is connected to the driving end plate 16 that has an axis of the condensate-supplying hole 16e disposed between the driving winding portions 17a and 17b.
    The guide ring 23 is connected to an inner surface 21b of the plate 21. The inner surface 21b of the plate 21 faces the outer surface 16a of the driving scroll body 6. The guide ring 23 comprises a polymeric resin material that is self-spreadable. An example of the polymer resin material comprises a polyether ether ketone (PEEK) resin. Note that the guide ring 23 may comprise a polyphenylene sulfide (PPS) resin. The guide ring 23 comprises a cylindrical shape. The guide ring 23 comprises a ring portion 28 and a flange portion 29. The flange portion 29 is formed on an end side of the ring portion 28. The ring portion 28 is fitted in a cavity portion of the plate 21. The flange portion is attached to the plate 21 with a bolt. The ring portion 28 includes a guide hole 23b. The driving pin 22 is placed in the guide hole 23b. The guide hole 23b is defined by the inner peripheral surface 23a of the guide ring 23. An inner diameter of the guide hole 23b is larger than an outer diameter of the pin portion 24 of the driving pin 22. A central axis of the driving pin 22 is offset from a central axis of the guide ring 23. A magnitude of this shift is essentially the same as that of the second axis A2 relative to the first axis Al (distance t, see Fig. 1). Therefore, the hard layer 27 of the driving pin 22 comes into contact with the inner peripheral surface 23a of the ring portion 28.
    As shown in FIG. 1, the working medium supplying portion 102 supplies the steam V to the scroll expansion device 1 including the configuration described above by the cap 13. The steam V is introduced into the expansion chamber S2 through a through hole of the cap 13 and the working medium introducing hole 3a of the input drive shaft 3. The steam V introduced into the expansion chamber S2 expands in a space formed by the driving coil 17 and the driven coil 19. Thereafter, the steam V moves from the center of the expansion chamber S2 to an outer circumference of the expansion chamber S2. The steam V ejected from the expansion chamber S2 to the inside of the housing 2 is ejected via outlet 1 Ie. Relative circumferential movement of the driven scroll body with respect to the driving scroll body 6 (bypass movement) takes place as a result of this expansion. Viewed from the housing 2, this circumferential movement is observed as the rotational movement of the driving scroll body 6 about the first axis A1 and the rotational movement of the driven scroll body 7 about the second axis A2. Therefore, the output drive shaft 4 connected to the driving scroll body 6 rotates about the first axis A1. This rotary motion of the output drive shaft 4 is transmitted to the dynamo 101.
    The scroll expansion device 1 controls the relative rotational movement of the driven scroll body 7 relative to the driving scroll body 6 via the driving pin 22 and the guide ring 23, and tolerates the relative rotational movement. The scroll expansion device 1 based on this principle is simple and has few components. That is why a reduction in manufacturing costs is achieved. Furthermore, the driving pin 22 and the guide ring 23 regulate the relative rotational movement of the driven scroll body 7 relative to the driving scroll body 6. Then, in a state where the outer peripheral surface 22s of the driving pin 22 is in close contact with the inner circumferential surface 23a of the guide ring, a sliding in a tangential direction of the inner circumferential surface 23a or the outer circumferential surface 22s takes place between the outer circumferential surface 22s of the driving pin 22 and the inner circumferential surface 23a of the guide ring 23. This sliding tolerates the circumferential movement of the driven scroll body 7 relative to the driving scroll body 6. Therefore, the scroll expansion device 1 does not require a bearing comprising a rolling element about the relative movement between the driving scroll body 6 and the driven scroll body 7. Therefore, the scroll expansion device 1 can suppress an increase in the mechanical energy loss. Further, the hard layer 27 comprising diamond-like carbon formed on the outer peripheral surface 22s of the driving pin 22 is formed. The guide ring 23 comprises the polyether ether ketone resin. An advantageous sliding state is achieved by contact between the hard layer 27 and the polyetherether ketone resin. Therefore, a stable circulation movement can be achieved with low abrasion over a long period. Furthermore, if the condensate is present in the space between the driving pin 22 and the guide ring 23, further reduction of mechanical energy loss can be achieved, since a coefficient of friction between the driving pin 22 and the guide ring 23 decreases. Therefore, the scroll expansion device 1 can maintain an advantageous rotation state.
    The driving pin 22 includes the condensate-supplying hole 22a. The condensate formed by condensation of the steam V is supplied to the space between the driving pin 22 and the guide ring 23 via the condensate-supplying hole 22a. The steam V or the condensate is forcefully supplied by expansion pressure of the steam V in the expansion chamber S2 towards an opening on the side of an upper side of the driving pin 22 via the condensate-supplying hole 22a. Therefore, the condensate is forcefully supplied to the space between the driving pin 22 and the guide ring 23. Since a melting state between the driving pin 22 and the guide ring 23 becomes advantageous due to this condensate, a reduction in the mechanical energy loss associated with relative rotational movement of the driven scroll body 7 relative to the driving scroll body 6 can be achieved. Furthermore, a stable supply of the condensate, the required power and the noise production can be reduced. In short, the scroll expansion device 1 uses, as a lubricant, the condensate formed by the condensation of evaporated gas through the expansion.
    The embodiment of the present invention has been described above. However, the present invention is not limited to the embodiment described above. The present invention can include a change without changing the idea described in the claims.
    For example, as shown in FIG. 4A, the driving pin 22A on top of the condensate-supplying hole 22a also includes another condensate-supplying hole 22b as the condensate-supplying portion. The condensate-supplying hole 22b extends from the condensate-supplying hole 22a to an outer peripheral surface 22s along a diameter direction of the driving pin 22A. The steam V or the condensate can be supplied directly to the outer peripheral surface 22s of the driving pin 22A via the condensate-supplying hole 22b. The driving pin 22A rotates about the first axis Al together with the driving scroll body 6. Therefore, the steam V or the condensate can be efficiently supplied to the outer peripheral surface 22s via the condensate-supplying hole 22b by centrifugal force of the rotation. Therefore, the condensate is supplied stably and continuously as a lubricating liquid to the space between the driving pin 22A and the guide ring 23. As a result, an advantageous lubrication condition can be maintained.
    Further, in addition to the condensate-providing holes 22a and 22b, the driving pin 22A may include a spiral groove 22c as the condensate-providing portion. The spiral groove 22b is formed on the outer peripheral surface in contact with the inner peripheral surface 23a of the guide ring 23. According to this configuration, if the steam V ejected after the expansion from the expansion chamber S2 condenses around the driving pin 22A, the condensate reach entire spiral groove 22c via capillary action. Therefore, the condensate is supplied stably and continuously as a lubricating fluid to the space between the driving pin 22A and the guide ring 23. As a result, an advantageous lubricating condition can be maintained.
    As shown in FIG. 4B, a driving pin 22B may include a dimple 22d as the condensate-containing portion. The dimple 22b holds a condensation layer W that occurs on a contact interface between the driving pin 22B and the guide ring 23. As shown in FIG. 4C, a driving pin may comprise a hydrophilic layer 31 formed on an outer peripheral surface 22s of the driving pin 22C. Specifically, the hydrophilic layer 31 is formed on the hard layer 27. Furthermore, a guide ring 23A may comprise a hydrophilic layer 32 formed on an inner peripheral surface 23a of the guide ring 23A. The scroll expansion device 1 can include both both hydrophilic layers 31 and 32, or can comprise hydrophilic layer 31 or 32. In others: scroll expansion device 1 may comprise at least one of the hydrophilic layers 31 and 32. The well 22d and the hydrophilic layers 31 and 32 suppress the spread of the condensation layer W as a lubricating liquid. As a result, an advantageous lubrication condition can be maintained.
    权利要求:
    Claims (4)
    [1]
    CONCLUSIONS
    A scroll expansion device to which steam is supplied as a working medium, comprising a driving scroll body comprising a pair of driving end plates and a driving winding formed on each of the pair of driving end plates, and having a first axis line as the axis of rotation; a driven scroll body comprising a driven end plate and a driven wrap formed on each of both surfaces of the driven end plate, which is placed between the pair of driving end plates and which, as a pivot axis, has a second axis that is offset from of the first axis; a support plate positioned such that the driven scroll body is inserted, which comprises a pair of plates coupled to the driving scroll body, and which has a second axis of rotation as a rotation axis; a cylindrical driving pin connected to the driving scroll body and protruding from the driving end plate toward the support plate; and a cylindrical guide ring connected to the support plate, and comprising an inner diameter greater than an outer diameter of the driving pin; wherein a layer comprising diamond-like carbon is formed on an outer peripheral surface of the driving pin in contact with an inner peripheral surface of the guide ring, and an inner peripheral surface of the ring comprises a polymeric resin material that is self-lubricating.
    [2]
    The scroll expansion device of claim 1, wherein the driving pin comprises a condensation-supplying portion, and the condensate-supplying portion provides condensate formed by condensation of the steam at a gap between the driving pin and the guide ring.
    [3]
    The scroll expansion device of claim 1, wherein at least one of the driving pin and the guide ring comprises a condensate-containing portion, and the condensate-containing portion holds condensate formed by the condensation of the steam in the space between the driving pin and the guide ring.
    [4]
    The scroll expansion device of claims 1 and 2, wherein at least one of the driving pin and the guide ring comprises a condensate-containing portion, and the condensate-containing portion holds condensate formed by the condensation of the steam in the gap between the driving pin and the guide ring.
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    同族专利:
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    CN111022317A|2018-10-09|2020-04-17|涡旋技研有限公司|Scroll compressor having a discharge port|
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    法律状态:
    2021-07-15| MM| Lapsed because of non-payment of the annual fee|Effective date: 20201031 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014-223177|2014-10-31|
    JP2014223177A|JP6345081B2|2014-10-31|2014-10-31|Scroll expander|
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