Wear test method for ring valve for compressor and wear test device

Abstract

To provide an abrasion test method and an abrasion test device of a ring valve for a compressor, capable of accurately evaluating abrasion resistance of the ring valve.SOLUTION: An abrasion test method of a ring valve for a compressor comprises: a step (S11) of holding the ring valve for the compressor inclined with respect to a simulation valve seat simulating the valve seat for the compressor so that a part of a one-sided surface of the ring valve in a circumferential direction is in one-sided contact with the simulation valve seat; and a step (S15) of moving the ring valve relative to the simulation valve seat so that a one-sided contact portion of the one-sided surface in one-sided contact with the simulation valve seat slides against the simulation valve seat, and the one-sided contact portion of the one-sided surface changes in the circumferential direction.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a wear test method for a ring valve for a compressor and a wear test apparatus.

Background Art

[0002] The wear test apparatus disclosed in Patent Document 1 enables evaluation of the wear resistance of a seal ring provided in a transmission for an automobile. The apparatus includes a seal ring as a test specimen, a disk against which the seal ring is pressed, and a rotating shaft connected to the disk. When the rotating shaft rotates, the disk rotates relative to the seal ring. The seal ring wears due to the sliding that occurs between the seal ring and the disk.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] It is conceivable that a ring valve for a compressor is adopted as a test specimen instead of the seal ring. In order to accurately evaluate the wear resistance of this ring valve, it is preferable that the wear test apparatus reproduce the behavior of the ring valve when the compressor operates. However, such a configuration is not disclosed in the above patent document.

[0005] An object of the present disclosure is to provide a wear test method for a ring valve for a compressor and a wear test apparatus that can accurately evaluate the wear resistance of the ring valve.

Means for Solving the Problems

[0006] The wear test method for a ring valve for a compressor according to at least one embodiment of the present disclosure is A step of holding a ring valve for a compressor, which is inclined with respect to a simulated valve seat imitating a valve seat for a compressor, such that a part of a circumferential direction of one side of the ring valve abuts against the simulated valve seat; A step of relatively moving the ring valve with respect to the simulated valve seat such that a contact portion of the one side that abuts against the simulated valve seat slides with respect to the simulated valve seat and the contact portion on the one side changes in the circumferential direction; It includes.

[0007] A wear test device for a ring valve for a compressor according to at least one embodiment of the present disclosure, A first shaft; A second shaft configured to rotate in conjunction with the first shaft while being inclined with respect to the first shaft; A simulated valve seat provided coaxially with the first shaft and imitating a valve seat for a compressor; A ring valve holding portion for holding the ring valve such that one side of the ring valve for a compressor abuts against the simulated valve seat; A drive source for rotating the first shaft and the second shaft such that a contact portion of the one side that abuts against the simulated valve seat slides with respect to the simulated valve seat and the contact portion on the one side changes in the circumferential direction of the ring valve; It includes.

Advantages of the Invention

[0008] According to the present disclosure, it is possible to provide a wear test method and a wear test device for a ring valve for a compressor that can accurately evaluate the wear resistance of the ring valve.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0010] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure thereto, but are merely illustrative examples. For example, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent states of relative displacement with tolerances or angles and distances that provide the same function. For example, expressions representing that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent states with tolerances or differences that provide the same function. For example, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent shapes such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also represent shapes including concave and convex portions, chamfered portions, etc. within a range where the same effect can be obtained. On the other hand, the expressions "comprising", "including", or "having" for one component are not exclusive expressions excluding the existence of other components. Note that the same reference numerals may be given to the same configurations and the description may be omitted.

[0011] <1. Outline of Compressor 10> FIG. 1 is a conceptual cross-sectional view of a compressor 10 according to an embodiment of the present disclosure. The compressor 10 is incorporated into a refrigeration cycle including a plurality of heat exchangers such as a condenser and an evaporator. Examples of the refrigeration cycle include a binary refrigeration cycle, a two-stage compression refrigeration cycle, or a reverse Brayton refrigeration cycle. In this case, the gas compressed by the compressor 10 is a refrigerant gas. In other embodiments, the compressor 10 may be incorporated into an internal combustion engine or the like, and the gas compressed by the compressor 10 may be a combustion gas.

[0012] The compressor 10 according to an embodiment of the present disclosure is a reciprocating compressor. The compressor 10 includes a crankcase 16 and a plurality of cylinder sleeves 40 accommodated in the crankcase 16. Each cylinder sleeve 40 forms a cylinder chamber Sc inside which a piston 42 is accommodated. Each piston 42 is connected to a crankshaft 48 supported by a thrust bearing 50 provided in the crankcase 16 via a connecting rod 52 and a crank pin 53. One end of the crankshaft 48 is connected to a motor 54, and each piston 42 can reciprocate inside each cylinder sleeve 40 by driving the motor 54.

[0013] In the exemplary embodiment shown in FIG. 1, two cylinder sleeves 40 are provided in parallel, and the pistons 42 of the two cylinder sleeves 40 are connected to the crankshaft 48 so as to reciprocate with a phase difference of 180° at the rotation angle of the crankshaft 48.

[0014] On one end side of the cylinder sleeve 40 (the upper end side of the cylinder sleeve 40 in FIG. 1), a support plate 44 for supporting the discharge valve 67 is provided. Inside the opening formed in the support plate 44, a truncated conical valve plate 70 is disposed. The valve plate 70 is coupled to the valve cage 66 by bolts 68, and the discharge valve 67 is held between the valve plate 70 and the valve cage 66. The valve cage 66 is biased toward the cylinder sleeve 40 by a coil spring 64. Also, the discharge valve 67 is biased toward the valve plate 70 by a valve spring (not shown) housed in a spring hole 69 provided in the valve cage 66.

[0015] The compressor 10 according to an embodiment of the present disclosure further includes a suction valve 63 provided around the cylinder chamber Sc of the cylinder sleeve 40 and a suction valve seat 61 configured such that the suction valve 63 seats thereon. The suction valve 63 is in the shape of an O-ring that continuously extends in the circumferential direction with respect to the axis of the cylinder sleeve 40. The suction valve seat 61 of the present embodiment includes a facing surface facing the suction valve 63, and a raised portion 61P, which is a region that bulges toward the suction valve 63, is formed on the facing surface. One side of the suction valve 63 partially contacts the raised portion 61P.

[0016] The outline of the operation of the compressor 10 shown in FIG. 1 for sucking and compressing gas is as follows. As the piston 42 descends with the driving of the motor 54 and the cylinder chamber Sc in the cylinder sleeve 40 is decompressed, the pressure in the suction space Si formed outside the cylinder sleeve 40 is slightly higher than the pressure in the cylinder chamber Sc. The suction valve 63 seated on the suction valve seat 61 is pushed up, and the sucked gas in the suction space Si flows into the cylinder chamber Sc through the suction valve seat 61. Thereafter, the piston 42 finishes descending and starts ascending. As a result of the gas being compressed by the piston 42 and the cylinder chamber Sc being pressurized, the suction valve 63 is pushed down and seats on the suction valve seat 61. When the piston 42 further ascends and the pressure in the cylinder chamber Sc is slightly higher than the pressure in the discharge space Sd, the discharge valve 67 is pushed up, and the compressed gas in the cylinder chamber Sc is discharged into the discharge space Sd.

[0017] <2. Behavior of the intake valve 63 before seating> Referring to FIG. 2, the details of the behavior of the intake valve 63 before seating according to an embodiment of the present disclosure are illustrated. FIG. 2 is a perspective view schematically showing the intake valve seat 61 and the intake valve 63. In FIG. 2, the above-described raised portion 61P of the intake valve seat 61 is not shown.

[0018] When the intake valve 63 floating above the intake valve seat 61 is pushed down, the pressure difference between the gas pressure in the cylinder chamber Sc and the gas pressure in the intake space Si is not strictly uniform in the circumferential direction of the intake valve 63. Therefore, the intake valve 63 is pushed down in a posture inclined with respect to the axial direction of the cylinder sleeve 40. At this time, a bending stress is generated in the intake valve 63 due to the pressure acting on the intake valve 63, etc., and the intake valve 63 bends so that the inner part is located on the side of the intake valve seat 61 (arrow B). Therefore, when the contact between the intake valve 63 and the intake valve seat 61 is started, one side 63A of the intake valve 63 (the lower surface of the intake valve 63 in FIG. 2) abuts against the intake valve seat 61. In other words, a part of one side 63A of the intake valve 63 comes into contact with the intake valve seat 61. A part of the reaction force acting on the intake valve 63 due to the abutment becomes a rotational force that rotates the intake valve 63 in the circumferential direction (arrow R). The abutment portion 63P on the one side 63A changes as the intake valve 63 rotates. The intake valve 63 gradually falls while rotating, and then contacts the intake valve seat 61 in a posture facing the intake valve seat 61. As a result, the intake valve 63 finishes rotating and seats on the intake valve seat 61. Note that the intake valve 63 may move in the radial direction with respect to the axis of the intake valve seat 61 while sliding on the intake valve seat 61. That is, the intake valve 63 may move relative to the intake valve seat 61 not only in the circumferential direction but also in the radial direction of the intake valve seat 61.

[0019] While the compressor 10 is operating, the suction valve 63 repeats the above-described behavior each time it changes from the lifted state to the seated state. Therefore, the sliding between one side 63A of the suction valve 63 and the suction valve seat 61 is repeated, and the one side 63A gradually wears out. In order to accurately evaluate whether the suction valve 63 has abrasion resistance above the required level, it is preferable to perform a wear test that reproduces the above-described behavior of the suction valve 63 when the compressor 10 is operating.

[0020] Note that compressor oil may be mixed into the gas sucked into the compressor 10. In this case, compressor oil is interposed between one side 63A of the suction valve seat 61 and the raised portion 61P of the suction valve seat 61, and wear of the suction valve 63 can be reduced.

[0021] Also, the compressor 10 according to another embodiment may include a stopper mechanism (not shown) for preventing (restricting) the rotation of the suction valve 63. As an example, the stopper mechanism includes a convex portion provided at the outer peripheral end of the suction valve 63 and a concave portion fixed so as to fit into the convex portion. Alternatively, the stopper mechanism may include a through hole provided in the suction valve 63 and a pin fixed so as to be inserted into the through hole. The through hole is open in the axial direction of the suction valve 63. By providing the stopper mechanism, the above-described rotational operation of the suction valve 63 is suppressed. However, even in this case, since a clearance is inevitably formed between the two members that fit together, the rotation of the suction valve 63 before seating does not completely disappear.

[0022] Furthermore, the compressor 10 according to another embodiment may include a suction valve spring (not shown) that presses the suction valve 63 against the suction valve seat 61. The suction valve spring has, for example, a plate shape that contacts the suction valve 63 in opposition. Even in this case, the rotation of the suction valve 63 before seating does not completely disappear. Note that the biasing force applied from the suction valve spring to the suction valve 63 may act as a bending stress on the suction valve 63 (arrow B in FIG. 2). As the bending stress increases, the area corresponding to the single-contact portion 63P in one side 63A of the suction valve 63 may increase.

[0023] <3. Wear Test Apparatus 1 for Ring Valve for Compressor> A wear test device 1 for a ring valve of a compressor according to an embodiment of the present disclosure (hereinafter sometimes simply referred to as "wear test device 1") will be described. Hereinafter, a wear test device 1A(1) according to the first embodiment and a wear test device 1B(1) according to the second embodiment will be described in order.

[0024] <3-1. Wear test device 1A for a ring valve of a compressor according to the first embodiment> FIG. 3 is a schematic cross-sectional view of the wear test device 1A. FIG. 4 is an explanatory view schematically showing the behavior of a ring valve 15 for a compressor evaluated by the wear test device 1A. In the present embodiment, as an example, the ring valve 15 for a compressor (hereinafter sometimes simply referred to as "ring valve 15") is the intake valve 63 of the compressor 10 described above.

[0025] As illustrated in FIG. 3, the wear test device 1A(1) according to the first embodiment includes a support base 72 extending horizontally, a first shaft 11A(11) connected to the support base 72 via a plurality of bearings 98, a simulated valve seat 21A(21) provided coaxially with the first shaft 11A, and a second shaft 12A(12) configured to rotate in conjunction with the first shaft 11A in a state inclined with respect to the first shaft 11A.

[0026] The first shaft 11A is rotatable with respect to the support base 72 and extends parallel to the vertical direction. The simulated valve seat 21A imitates the suction valve seat 61 (see FIG. 1), which is an example of a valve seat for a compressor. In this example, the suction valve seat 61 additionally processed for testing purposes corresponds to the simulated valve seat 21A. The simulated valve seat 21A is fixed to the support base 72. Further, the simulated valve seat 21A includes a facing surface 21F facing one side in the axial direction of the first shaft 11A (the upper side in the example of FIG. 3). A raised portion 21P, which is a raised area, is formed on the facing surface 21F. Both the facing surface 21F and the raised portion 21P are in the shape of an O-ring centered on the first shaft 11. The second shaft 12A of this example extends obliquely with respect to the vertical direction. Further, the second shaft 12A is directly connected to one end of the first shaft 11A. As a more specific example, the second shaft 12A is fixed to the first shaft 11A by a fastening member (not shown). Note that the second shaft 12A may be integrally formed with the first shaft 11A.

[0027] The wear test apparatus 1A of the present embodiment further includes a ring valve holding portion 29A (29) configured to hold the ring valve 15 for a compressor. The ring valve holding portion 29A is rotatably connected to the second shaft 12A. The ring valve 15 held by the ring valve holding portion 29A is located on one side in the axial direction of the first shaft 11A with respect to the simulated valve seat 21A and faces the facing surface 21F of the simulated valve seat 21A. Further, the ring valve 15 is coaxial with the second shaft 12A and is inclined with respect to the axis L1 of the first shaft 11A. Thereby, one side 15A of the ring valve 15 abuts against the above-described raised portion 21P of the facing surface 21F.

[0028] An example of the specific structure that enables the ring valve holding part 29 to rotate relative to the second shaft 12A is as follows. The ring valve holding part 29A includes a base part 295 connected to the first shaft 11A via a bearing 97, a first holding body 291 fixed to the base part 295 by a plurality of first fastening members 91, and a second holding body 292 fixed to the first holding body 291 by a plurality of second fastening members 92. The first holding body 291 and the second holding body 292 face each other and are in contact. Since the bearing 97 is interposed between the base part 295 and the second shaft 12A, the ring valve holding part 29 can rotate relative to the second shaft 12A.

[0029] An example of the specific structure in which the ring valve holding part 29A holds the ring valve 15 is as follows. A recess 289 is formed at the radially outer end of the first holding body 291 with respect to the second shaft 12A. This recess 289 is recessed in a direction away from the second holding body 292 in the axial direction of the second shaft 12A. Also, the shape of the recess 289 is O-ring shaped when viewed in the axial direction of the second shaft 12A. The inner part of the ring valve 15 is accommodated in the recess 289. The part of the ring valve 15 accommodated in the recess 289 is sandwiched between the first holding body 291 and the second holding body 292. The axial direction of the ring valve 15 held in this way coincides with the axial direction of the first shaft 11A. One side 15A of the ring valve 15 abuts against the raised part 21P of the simulated valve seat 21A.

[0030] To replace the ring valve 15 with another ring valve 15, remove the second fastening member 92 and remove the second holding body 292 from the first holding body 291. Thereby, the held ring valve 15 can be removed from the ring valve holding part 29A. After that, the ring valve 15 is arranged so that the inner end of the new O-ring shaped ring valve 15 abuts against the recess 289. After sandwiching the ring valve 15 accommodated in the recess 289 with the second holding body 292, fix the second holding body 292 to the first holding body 291 with the second fastening member 92. Thereby, the replacement of the ring valve 15 is completed, and the ring valve holding part 29 can hold the new ring valve 15.

[0031] The wear test apparatus 1A of this embodiment further includes a drive source 30. The drive source 30 is a motor configured to rotate the first shaft 11A and the second shaft 12A. In this example, the drive source 30 is connected to the first shaft 11A. By applying a driving force to the first shaft 11A by the drive source 30, the first shaft 11A rotates about the axis L1, and the second shaft 12A pivots about the axis L1 of the first shaft 11A. Accordingly, the ring valve 15 held by the ring valve holding portion 29A pivots about the axis L1 in a posture inclined with respect to the first shaft 11A.

[0032] When the ring valve 15 pivots about the axis L1 together with the ring valve holding portion 29A, the contact portion 15P of the ring valve 15 slides with respect to the raised portion 21P (see FIG. 4). In FIG. 4, which is a schematic view in the axial direction of the first shaft 11, the axis L2 of the second shaft 12 is shown as a point for the purpose of simplified illustration.

[0033] As illustrated in FIG. 4, when the ring valve 15 pivots about the axis L1, the contact portion 15P slides with respect to the raised portion 21P of the simulated valve seat 21. The frictional force generated between the contact portion 15P and the raised portion 21P during sliding rotates the ring valve 15 about the axis L2 (arrow R). Accordingly, the portion of the single surface 15A of the ring valve 15 corresponding to the contact portion 15P changes in the circumferential direction of the ring valve 15 as it pivots. Such relative movement of the inclined ring valve 15 with respect to the simulated valve seat 21 is the same as the relative movement of the intake valve 63 with respect to the intake valve seat 61 described above.

[0034] According to the above configuration, since the second shaft 12A is inclined with respect to the first shaft 11A, when the drive source 30 is driven, the ring valve 15 inclined with respect to the simulation valve seat 21A rotates about the axis L1 of the first shaft 11A. Due to this rotation, the contact portion 15P that contacts the simulation valve seat 21 on one side 15A of the ring valve 15 slides with respect to the simulation valve seat 21, and the ring valve 15 can move relative to the simulation valve seat 21 such that the contact portion 15P on one side 15A of the ring valve 15 changes in the circumferential direction. Thereby, the wear test apparatus 1A can reproduce the behavior of the ring valve 15 while the compressor 10 is operating, and can slide one side 15A of the ring valve 15 with respect to the simulation valve seat 21A. Therefore, a wear test apparatus 1A that can accurately evaluate the wear resistance of the ring valve 15 is realized.

[0035] Returning to FIG. 3, in one embodiment of the present disclosure, a stopper 87 for preventing the rotation of the ring valve holder 29A about the second shaft 12A may be selectively installed, for example, according to test conditions. The stopper 87 is swingably connected to a fixing plate 25 that extends horizontally as an example. The fixing plate 25 is supported by a fixing base 24. In the embodiment in which the stopper 87 is provided, even if the second shaft 12A rotates, the rotation of the ring valve holder 29A and the ring valve 15 about the axis L2 is blocked. In other words, the stopper 87 applies a braking force that blocks the rotation of the ring valve 15 about the axis of the ring valve 15. However, even in this case, with the rotation of the first shaft 11A, the ring valve 15 can rotate about the axis L1 together with the second shaft 12A. Since the rotation of the ring valve 15 about the axis L2 of the second shaft 12 is blocked, the behavior of the suction valve 63 when the above-described stopper mechanism is provided in the compressor 10 can be reproduced.

[0036] Furthermore, the wear test apparatus 1A may further include a biasing means 35 that biases the ring valve holding portion 29A toward the simulated valve seat 21. The biasing means 35 of the present embodiment is a stud bolt that presses the fixing plate 25 toward the fixing base 24. In other embodiments, the biasing means 35 may be a spring interposed between the fixing plate 25 and the stopper 87. Also, the biasing means 35 may directly bias the ring valve holding portion 29A.

[0037] According to the above configuration, since the single-contact portion 15P of the ring valve 15 abuts against the simulated valve seat 21A, the frictional force generated by the sliding of the single-contact portion 15P against the simulated valve seat 21A increases, and the progress of wear on one side 15A can be accelerated. Therefore, the wear resistance of the ring valve 15 can be accurately evaluated in a short time.

[0038] In the present embodiment, the second shaft 12A is eccentric with respect to the first shaft 11A. In the example of FIG. 3, the amount of eccentricity of the second shaft 12A with respect to the first shaft 11A corresponds to the dimension E. In this case, as shown in FIG. 4, the ring valve 15 moves relative to the simulated valve seat 21 in the radial direction with reference to the axis of the simulated valve seat 21A (that is, the axis L1 of the first shaft 11A). Therefore, the radial distance between the ring valve 15 and the axis L1 changes as the ring valve 15 rotates. As a result, the sliding amount of the single-contact portion 15P sliding against the simulated valve seat 21A increases, so that the wear resistance of the ring valve 15 can be accurately evaluated in a short time. Also, the behavior of the suction valve 63 that moves radially relative to the suction valve seat 61 in the compressor 10 can be reproduced.

[0039] Also, in the present embodiment, the simulated valve seat 21A is fixed at a specified position and does not perform rotational and swirling motions accompanying the driving of the drive source 30. In this example, the simulated valve seat 21A is fixed to the support base 72 by a plurality of fastening members. According to the above configuration, since a drive mechanism for moving the simulated valve seat 21A among the simulated valve seat 21A and the ring valve 15 becomes unnecessary, the wear test apparatus 1A can be simplified.

[0040] In addition, in the present embodiment, the second shaft 12B is directly connected to the first shaft 11B, and the ring valve holding portion 29A is connected to the second shaft 12B via a bearing 97. Only a configuration is adopted in which the ring valve holding portion 29A is connected to the second shaft 12A directly connected to the first shaft 11A via a bearing 97, and the contact portion 15P of the ring valve 15 slides with respect to the simulated valve seat 21A, and a movement in which the contact portion 15P on one side 15A of the ring valve 15 changes in the circumferential direction is realized. Therefore, the wear test apparatus 1A can be simplified.

[0041] <3-2. Wear test apparatus 1B according to the second embodiment> Referring to FIG. 5, a wear test apparatus 1B(1) according to the second embodiment is illustrated. FIG. 5 is a schematic cross-sectional view of the wear test apparatus 1B according to the second embodiment.

[0042] The wear test apparatus 1B includes a first support base 31 and a first shaft 11B(11) connected to the first support base 31 via a plurality of bearings 39. At one end of the first shaft 11B, a simulated valve seat 21B(21) is fixed by, for example, a fastening member 59. The simulated valve seat 21B coaxial with the first shaft 11B includes a facing surface 21F facing the ring valve 15 and a raised portion 21P that is a raised region of the facing surface 21F. The raised portion 21P in the second embodiment is an O-ring shape centered on the axis M1 of the first shaft 11.

[0043] The wear test apparatus 1B further includes a second support base 32, a second shaft 12B connected to the second support base 32 via a plurality of bearings 38, and a ring valve holding portion 29B(29) fixed to the second shaft 12B. The second shaft 12B is inclined and eccentric with respect to the first shaft 11B. The ring valve 15 held by the ring valve holding portion 29B is held such that one side 15A thereof contacts the raised portion 21P of the simulated valve seat 21B. The ring valve 15 is fixed to the ring valve holding portion 29B by a fastening member (not shown). Although detailed illustration is omitted, the second support base 32 may be supported by another support base so as to be rotatable about the axis M1 of the first shaft 11B.

[0044] The wear test device 1B further includes a drive source 30 connected to the first shaft 11B. When the drive source 30 drives, the simulated valve seat 21B rotates together with the first shaft 11B. The rotational force centered on the axis M1 of the first shaft 11B is transmitted from the simulated valve seat 21B to the ring valve 15. Thereby, the ring valve 15 pivots about the axis M1 together with the ring valve holding portion 29B and the second shaft 12B. That is, the ring valve 15, the ring valve holding portion 29B, and the second shaft 12B are driven by the rotationally driven simulated valve seat 21. Also, due to the frictional force generated between the raised portion 21P and one side 15A of the ring valve 15, the ring valve 15 rotates about the axis M2 of the second shaft 12B together with the ring valve holding portion 29B and the second shaft 12B. If no slippage occurs between the ring valve 15 and the simulated valve seat 21, the rotational speed about the axis M2 of the second shaft 12B is the same as the rotational speed about the axis M1 of the first shaft 11B. When slippage occurs, the rotational speed of the second shaft 12B becomes slower than the rotational speed of the first shaft 11B.

[0045] Based on the above principle, the ring valve 15 behaves in the same manner as described with reference to FIG. 4. That is, the contact portion 15P that contacts the simulated valve seat 21B on one side 15A slides with respect to the simulated valve seat 21B, and the contact portion 15P on one side 15A changes in the circumferential direction of the ring valve 15. The speed at which the contact portion 15P on one side 15A changes in the circumferential direction is the same as the rotational speed of the second shaft 12B.

[0046] The wear test device 1B according to the second embodiment described above can, like the wear test device 1B according to the first embodiment, accurately evaluate the wear resistance of the ring valve 15. Note that the second shaft 12B shown in FIG. 5 may be inclined only with respect to the first shaft 11B without being eccentric with respect to the first shaft 11B. Also, the biasing means 35 described above with reference to FIG. 3 may be provided in the wear test device 1B.

[0047] In this embodiment, the simulation valve sheet 21B is fixed to the first shaft 11B. Further, the ring valve holding portion 29B is fixed to the second shaft 12B, and one side 15A of the ring valve 15 held by the ring valve holding portion 29B abuts against the simulation valve sheet 21. The ring valve 15 is driven by the rotation of the simulation valve sheet 21B that is rotationally driven, and the ring valve 15 performs the above-described relative movement with respect to the simulation valve sheet 21.

[0048] According to the above configuration, in order to change the conditions of the wear test, it is only necessary to change the configuration of either the support mechanism such as the first support base 31 for supporting the simulation valve sheet 21B so that it can be rotationally driven, or the support mechanism such as the second support base 32 for supporting the ring valve 15 so that it can be driven to rotate passively. For example, by changing the position and tilt posture of the first support base 31, it becomes possible to adjust the eccentricity and tilt angle of the second shaft 12B with respect to the first shaft 11B, respectively. Therefore, a wear test apparatus 1B with a high degree of freedom in changing the test conditions is realized.

[0049] Further, the wear test apparatus 1B illustrated in FIG. 5 may include a joint 88 connected to the first shaft 11B and the second shaft 12B. The joint 88 is a universal joint or a shaft joint, etc. By providing the joint 88, the first shaft 11B and the second shaft 12B can rotate at the same speed.

[0050] According to the above configuration, even when the sliding state of the ring valve 15 with respect to the simulation valve sheet 21B changes, for example, when the ring valve 15 slides against the raised portion 21P of the simulation valve sheet 21, it is possible to suppress the rotation speeds of the second shaft 12B and the first shaft 11B from deviating from each other. Therefore, it is possible to suppress a decrease in the turning speed around the axis M1 of the ring valve 15, and it is possible to suppress a decrease in the change in the circumferential direction of the ring valve 15 at the abutting portion 15P on one side 15A of the ring valve 15. Therefore, the wear resistance of the ring valve 15 can be accurately evaluated in a short time.

[0051] <4. Wear test method for ring valve 15> Referring to FIGS. 3, 5, and 6, a wear test method for the ring valve 15 will be exemplified. FIG. 6 is a flowchart showing the wear test method for the ring valve 15 according to an embodiment of the present disclosure. In the following description, steps may be abbreviated as "S".

[0052] The wear test method for the ring valve 15 using the wear test device 1A is performed, for example, according to the following procedure. First, the ring valve 15 inclined with respect to the simulated valve seat 21A is held so that a part of one side 15A abuts against the simulated valve seat 21 (S11). The method of attaching the ring valve 15 to the ring valve holding portion 29A is as described above.

[0053] Next, lubricating oil is supplied between the ring valve 15 and the simulated valve seat 21 (S13). As a result, the lubricating oil enters between one side 15A of the ring valve 15 and the raised portion 21P of the simulated valve seat 21. Then, the ring valve 15 is relatively moved with respect to the simulated valve seat 21 (S15). Specifically, when the drive source 30 of the wear test device 1A is driven, the relative movement of the ring valve 15 is started, and the abutting portion 15P of one side 15A of the ring valve 15 slides, and the abutting portion 15P on one side 15A changes in the circumferential direction of the ring valve 15. After a specified time has elapsed since the drive source 30 started driving, the drive source 30 is stopped. Then, if the ring valve 15 is removed from the wear test device 1A and the wear amount of one side 15A is measured, the wear resistance of the ring valve 15 can be evaluated.

[0054] During the execution of S15, one side 15A of the ring valve 15 abuts against the raised portion 21P of the simulated valve seat 21. According to the above configuration, a wear test method that more faithfully reproduces the operating environment of the compressor 10 in which the ring valve 15 and the suction valve seat 61 are partially in contact is realized.

[0055] Note that, when S15 is executed, the wear test device 1A may not be provided with the stopper 87. That is, in S15, rotation about the axis of the ring valve 15 (which coincides with the axis L2 of the first shaft 11 in FIG. 4) may be allowed for the ring valve 15. According to the above configuration, the behavior of the ring valve 15 in the compressor 10 having a configuration in which the ring valve 15 (the intake valve 63 in this example) can rotate in the circumferential direction can be reproduced more faithfully.

[0056] In other embodiments, the wear test device 1A may be provided with the stopper 87 when S15 is executed. That is, in S15, a braking force that prevents rotation about the axis of the ring valve 15 may be applied to the ring valve 15. According to the above configuration, the behavior of the ring valve 15 in the compressor 10 having a configuration (for example, a stopper mechanism) that regulates rotation about the axis of the intake valve 63 can be reproduced more faithfully.

[0057] Also, in the present embodiment, before S15 is executed, a step (S13) of supplying lubricating oil is executed. According to the above configuration, a wear test method for a ring valve for a compressor that more faithfully reproduces the operating environment of an actual compressor (10) is realized. Note that S13 may be performed during the execution of S15. Further, the above-described wear test method for a ring valve for a compressor may be used in the wear test device 1B.

[0058] <5. Summary> The content described in several of the above embodiments is understood as follows, for example.

[0059] 1) The wear test method for a ring valve for a compressor according to at least one embodiment of the present disclosure includes a step (S11) of holding a ring valve (15) for a compressor inclined with respect to a simulated valve seat (21) simulating a valve seat (intake valve seat 61) for a compressor such that a part of the circumferential direction of one side (15A) of the ring valve (15) abuts against the simulated valve seat (21); A step (S15) of relatively moving the ring valve (15) with respect to the simulated valve seat (21) such that a contact portion (15P) of the one surface (15A) that contacts the simulated valve seat (21) slides with respect to the simulated valve seat (21) and the contact portion (15P) on the one surface (15A) changes in the circumferential direction. is provided.

[0060] When the actual compressor (10) operates, the ring valve (15) that moves toward the valve seat (suction valve seat 61) assumes a posture inclined with respect to the valve seat (suction valve seat 61). When the ring valve (15) hits the valve seat (suction valve seat 61) in this posture, the ring valve (15) bends due to a bending stress caused by a gas pressure or a biasing force such as a spring, and a part of the circumferential direction of one surface (15A) of the ring valve (15) contacts the valve seat (suction valve seat 61) one-sidedly. After that, before the ring valve (15) seats on the valve seat (suction valve seat 61), the contact portion (15P) of one surface (15A) of the ring valve (15) slides with respect to the valve seat (suction valve seat 61), and this contact portion (15P) on one surface (15A) of the ring valve (15) changes in the circumferential direction of the ring valve (15). Since the ring valve (15) repeats the above-described behavior during the operation of the compressor (10), one surface (15A) of the ring valve (15) wears. According to the configuration of 1) above, by executing the step of relatively moving the ring valve (15) with respect to the simulated valve seat (21), the behavior of the ring valve (15) when the compressor (10) operates is reproduced, and one surface (15A) of the ring valve (15) can be slid with respect to the simulated valve seat (21). Therefore, a wear test method for a ring valve for a compressor that can accurately evaluate the wear resistance of the ring valve (15) is realized.

[0061] 2) In some embodiments, it is a wear test method for a ring valve for a compressor according to 1) above, in the step (S15) of relatively moving, the ring valve (15) is biased toward the simulated valve seat (21).

[0062] According to the configuration of 2) above, since the contact portion (15P) of the ring valve (15) presses against the simulated valve seat (21), the progress of wear in the ring valve (15) can be accelerated. Therefore, the wear resistance of the ring valve (15) can be accurately evaluated in a short time.

[0063] 3) In some embodiments, it is a method for testing wear of a ring valve for a compressor according to any one of 1) or 2) above, In the step of holding (S11), the ring valve (15) is held so as to be eccentric with respect to the simulated valve seat (21).

[0064] According to the configuration of 3) above, when the step of causing relative movement (S15) is executed, the ring valve (15) moves relative to the simulated valve seat (21) in the radial direction with respect to the axis of the simulated valve seat (21). As a result, the sliding amount of the contact portion (15P) of the ring valve (15) sliding with respect to the simulated valve seat (21) increases, so that the wear resistance of the ring valve (15) can be accurately evaluated in a short time.

[0065] 4) In some embodiments, it is a method for testing wear of a ring valve for a compressor according to any one of 1) to 3) above, In the step of causing relative movement (S15), the simulated valve seat (21) is fixed at a specified position.

[0066] According to the configuration of 4) above, since a drive mechanism for moving the simulated valve seat (21) is not required between the simulated valve seat (21) and the ring valve (15), the apparatus for implementing the method for testing wear of the ring valve for a compressor can be simplified.

[0067] 5) In some embodiments, it is a method for testing wear of a ring valve for a compressor according to any one of 1) to 4) above, In the step of causing relative movement (S15), rotation about the axis of the ring valve (15) is allowed with respect to the ring valve (15).

[0068] According to the configuration of 5) above, a wear test method for a ring valve for a compressor is realized, which more faithfully reproduces the behavior of the ring valve (15) in the compressor (10) having a configuration in which the ring valve (15) can rotate around the axis.

[0069] 6) In some embodiments, a wear test method for a ring valve for a compressor according to any one of 1) to 4) above, In the step (S15) of causing relative movement, a braking force that prevents rotation of the ring valve (15) about the axis of the ring valve (15) is applied to the ring valve (15).

[0070] According to the configuration of 6) above, a wear test method for a ring valve for a compressor is realized, which more faithfully reproduces the behavior of the ring valve (15) in the compressor (10) having a configuration that restricts rotation of the ring valve (15) about the axis.

[0071] 7) In some embodiments, a wear test method for a ring valve for a compressor according to any one of 1) to 3) above, In the step (S15) of causing relative movement, the ring valve (15) driven to rotate by the simulated valve seat (21) is caused to move relative to the simulated valve seat (21).

[0072] According to the configuration of 7) above, the test conditions can be changed by changing either the configuration of the mechanism for supporting the simulated valve seat (21) so that it can be rotationally driven or the configuration of the mechanism for supporting the ring valve (15) so that it can be driven to rotate passively. Therefore, a wear test method for a ring valve for a compressor with a high degree of freedom in changing the test conditions is realized.

[0073] 8) In some embodiments, a wear test method for a ring valve for a compressor according to any one of 1) to 7) above, In the step (S15) of causing relative movement, the raised region (raised portion 21P) that bulges toward the ring valve (15) among the opposing surfaces (21F) of the simulated valve seat (21) that opposes the one surface (15A) of the ring valve (15) is applied to the one surface (15A).

[0074] According to the configuration of 8) above, a method for testing wear of a ring valve for a compressor is realized, which more faithfully reproduces the operating environment of the compressor (10) in which the ring valve (15) and the valve seat (suction valve seat 61) are in partial contact.

[0075] 9) In some embodiments, it is a method for testing wear of a ring valve for a compressor according to any one of 1) to 8) above, and further includes an oil supply step (S13) of supplying lubricating oil between the ring valve (15) and the simulated valve seat (21) when executing the step (S15) of relatively moving them.

[0076] According to the configuration of 9) above, a method for testing wear of a ring valve for a compressor is realized, which more faithfully reproduces the operating environment of the actual compressor (10).

[0077] 10) A wear test device (1) for a ring valve for a compressor according to at least one embodiment of the present disclosure includes a first shaft (11), a second shaft (12) configured to rotate in conjunction with the first shaft (11) while being inclined with respect to the first shaft (11), a simulated valve seat (21) provided coaxially with the first shaft (11) and simulating a valve seat (suction valve seat 61) for a compressor, a ring holding portion (29) for holding the ring valve (15) such that one side (15A) of the ring valve (15) for a compressor abuts against the simulated valve seat (21), a drive source (30) for rotating the first shaft (11) and the second shaft (12) such that a contact portion (15P) that abuts against the simulated valve seat (21) on the one side (15A) slides with respect to the simulated valve seat (21) and the contact portion (15P) on the one side (15A) changes in the circumferential direction of the ring valve (15). and is provided with.

[0078] According to the configuration of the above 10), since the second shaft (12) is inclined with respect to the first shaft (11), when the drive source (30) is driven, the ring valve (15) inclined with respect to the first shaft (11) rotates about the axis (L1, M1) of the first shaft (11). Along with this rotation, the contact portion (15P) that contacts the simulated valve seat (21) on one side (15A) of the ring valve (15) slides with respect to the simulated valve seat (21), and the ring valve (15) can move relative to the simulated valve seat (21) such that the contact portion (15P) on one side (15A) of the ring valve (15) changes in the circumferential direction. Thus, for the same reason as in the above 1), a wear test apparatus (1) for a ring valve for a compressor that can accurately evaluate the wear resistance of the ring valve (15) is realized.

[0079] 11) In some embodiments, it is a wear test apparatus (1) for a ring valve for a compressor described in the above 10), further comprising biasing means (35) for biasing the ring holding portion (29) toward the simulated valve seat (21).

[0080] According to the configuration of the above 11), for the same reason as in the above 2), the wear resistance of the ring valve (15) can be accurately evaluated in a short time.

[0081] 12) In some embodiments, it is a wear test apparatus (1) for a ring valve for a compressor described in any of the above 10) or 11), the second shaft (12) is eccentric with respect to the first shaft (11).

[0082] According to the configuration of the above 12), when the drive source (30) is driven, the ring valve (15) moves relative to the simulated valve seat (21) in the radial direction with respect to the axis of the simulated valve seat (21). Thus, for the same reason as in the above 3), the wear resistance of the ring valve (15) can be accurately evaluated in a short time.

[0083] 13) In some embodiments, there is a wear test apparatus (1) for a ring valve of a compressor according to any one of 10) to 12) above, The simulated valve seat (21) is fixed at a specified position.

[0084] According to the configuration of 13) above, for the same reason as in 4) above, the wear test apparatus (1) for a ring valve of a compressor can be simplified.

[0085] 14) In some embodiments, there is a wear test apparatus (1) for a ring valve of a compressor according to any one of 10) to 13) above, The second shaft (12) is directly connected to the first shaft (11), The ring holding portion (29) is connected to the second shaft (12) via a bearing (97).

[0086] According to the configuration of 14) above, only a configuration in which the ring holding portion (29) is connected to the second shaft (12) directly connected to the first shaft (11) via the bearing (97) is adopted, and the contact portion (15P) of the ring valve (15) slides with respect to the simulated valve seat (21), and a movement in which the contact portion (15P) on one side (15A) of the ring valve (15) changes in the circumferential direction is realized. Therefore, the wear test apparatus (1) for a ring valve of a compressor can be simplified.

[0087] 15) In some embodiments, there is a wear test apparatus (1) for a ring valve of a compressor according to any one of 10) to 12) above, The first shaft (11) is connected to the drive source (30), The simulated valve seat (21) is fixed to the first shaft (11), The ring holding portion (29) configured to hold the ring valve (15) for contacting the simulated valve seat (21) is fixed to the second shaft (12).

[0088] According to the configuration of the above (15), the ring valve (15) is driven by the simulated valve seat (21) that is rotationally driven by the drive source (30). As a result, the ring valve (15) moves relative to the simulated valve seat (21). Therefore, for the same reason as the above (7), a wear test device (1) for a ring valve for a compressor with a high degree of freedom in changing test conditions is realized.

[0089] 16) In some embodiments, it is a wear test device (1) for a ring valve for a compressor described in the above (15), further comprising a joint (88) connected to the first shaft (11) and the second shaft (12).

[0090] According to the configuration of the above (16), it is possible to suppress the deviation between the rotational speed of the second shaft (12) and the rotational speed of the first shaft (11) due to the change in the sliding state of the ring valve (15) with respect to the simulated valve seat (21). Therefore, it is possible to suppress the slowing down of the circumferential change of the contact portion (15P) on one side (15A) of the ring valve (15), so that the wear resistance of the ring valve (15) can be accurately evaluated in a short time.

Explanation of Reference Numerals

[0091] 1: Wear test device 10: Compressor 11: First shaft 12: Second shaft 15: Ring valve 15A: One side 15P: Contact portion 21: Simulated valve seat 21F: Opposing surface 21P: Protrusion 30: Drive source 35: Biasing means 40: Cylinder sleeve 63: Suction valve 63A: One side 63P: Contact portion 88: Joint 97: Bearing

Claims

1. Holding a ring valve for a compressor, which is inclined with respect to a simulated valve seat imitating a valve seat for a compressor, such that a part of the circumferential direction of one side of the ring valve abuts against the simulated valve seat; Relatively moving the ring valve with respect to the simulated valve seat such that the abutting portion of the one side that abuts against the simulated valve seat slides with respect to the simulated valve seat and the abutting portion on the one side changes in the circumferential direction; A wear test method for a ring valve for a compressor, comprising the above steps.

2. In the step of relatively moving, biasing the ring valve toward the simulated valve seat. The wear test method for a ring valve for a compressor according to Claim 1.

3. In the step of holding, holding the ring valve eccentrically with respect to the simulated valve seat. The wear test method for a ring valve for a compressor according to Claim 1 or 2.

4. In the step of relatively moving, fixing the simulated valve seat at a specified position. The wear test method for a ring valve for a compressor according to any one of Claims 1 to 3.

5. In the step of relatively moving, allowing rotation of the ring valve about the axis of the ring valve. The wear test method for a ring valve for a compressor according to any one of Claims 1 to 4.

6. In the step of relatively moving, applying a braking force that prevents rotation of the ring valve about the axis of the ring valve. The wear test method for a ring valve for a compressor according to any one of Claims 1 to 4.

7. In the step of relatively moving, relatively moving the ring valve that is driven to rotate by the simulated valve seat with respect to the simulated valve seat. The wear test method for a ring valve for a compressor according to any one of Claims 1 to 3.

8. In the step of relatively moving, applying an area that bulges toward the ring valve on the opposing surface of the simulated valve seat that opposes the one side of the ring valve to the one side. The wear test method for a ring valve for a compressor according to any one of Claims 1 to 7.

9. When executing the step of relatively moving, further comprising an oil supply step of supplying lubricating oil between the ring valve and the simulated valve seat. The wear test method for a ring valve for a compressor according to any one of Claims 1 to 8.

10. A first shaft, and A second shaft configured to rotate in conjunction with the first shaft while being inclined with respect to the first shaft; A simulated valve seat provided coaxially with the first shaft and simulating a valve seat for a compressor; A ring valve holding portion for holding the ring valve such that one side of the ring valve for the compressor abuts against the simulated valve seat; A drive source for rotating the first shaft and the second shaft such that a contact portion that abuts against the simulated valve seat on one side slides with respect to the simulated valve seat and the contact portion on one side changes in the circumferential direction of the ring valve; A wear test apparatus for a ring valve for a compressor, comprising:

11. The wear test apparatus for a ring valve for a compressor according to claim 10, further comprising biasing means for biasing the ring valve holding portion toward the simulated valve seat.

12. The second shaft is eccentric with respect to the first shaft. The wear test apparatus for a ring valve for a compressor according to claim 10 or 11.

13. The simulated valve seat is fixed at a specified position. The wear test apparatus for a ring valve for a compressor according to any one of claims 10 to 12.

14. The second shaft is directly connected to the first shaft. The ring valve holding portion is connected to the second shaft via a bearing. The wear test apparatus for a ring valve for a compressor according to any one of claims 10 to 13.

15. The first shaft is connected to the drive source. The simulated valve seat is fixed to the first shaft. The ring valve holding portion configured to hold the ring valve for contacting the simulated valve seat is fixed to the second shaft. The wear test apparatus for a ring valve for a compressor according to any one of claims 10 to 12.

16. Further comprising a joint connected to the first shaft and the second shaft. The wear test apparatus for a ring valve for a compressor according to claim 15.

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