JP5331767B2 - Capacity controller for reciprocating compressors - Google Patents

Description

  The present invention relates to a capacity control device used in a reciprocating compressor that compresses a fluid such as a low-temperature gas.

  The reciprocating compressor is provided with a capacity control device for controlling the discharge capacity of the compressed gas discharged from the cylinder. It is known that a suction valve unloading method is used in a capacity control device (unloader) of a reciprocating compressor (see Patent Documents 1 and 2).

  The suction valve unloading method uses a capacity control device to force the suction valve to be always open and control the compression chamber not to compress the gas in the compression chamber cylinder. This is a method for controlling the discharge capacity of gas discharged from a cylinder. The capacity control device operates by transmitting a certain driving force necessary for operation from an operation mechanism that is an actuator through an operation shaft.

  The driving method of the operating mechanism can be roughly divided into two methods. A working gas, which is a compressed gas, is always supplied to the inside of the working mechanism, and the suction valve can be opened and closed using the pressure of the working gas. When controlling the discharge capacity, by stopping the supply of compressed gas to the operating mechanism, the operating mechanism of the capacity control device is operated, and the suction valve is kept open by the biasing force of the coil spring, so-called There is a gas to load method. In addition, there is a so-called gas to unload method in which the capacity control device is operated by supplying compressed gas to the operating mechanism.

  Of these two methods, the gas to load method is often used in consideration of mechanical safety. FIG. 4 is a cross-sectional view showing a general gas to load type capacity control device used at room temperature.

  As shown in FIG. 4, the capacity control apparatus 102 is installed adjacent to the valve cover 135 of the intake chamber cylinder 131 provided in the reciprocating compressor. In the capacity control device 102, a casing 140 that accommodates the operating mechanism 139 is fixed to the valve cover 135 with fixing bolts 142.

  In the capacity control device 102, the driving force necessary for the unloading operation of the suction valve 133 to keep the suction portion 111 open is transmitted to the suction valve 133 via the operating shaft 137. The operating shaft 137 is supported so as to be movable in the axial direction across the holder 145 fixed to the valve cover 135 and the casing 140 of the operating mechanism 139, and the moving direction of the operating shaft 137 is restricted.

  In the casing 140, the coil spring 148 is incorporated in a state in which the coil spring 148 is contracted from the natural length, and the operating shaft 137 is moved downward in FIG. 4 by the elastic force in a state where the operating gas is not supplied in the casing 140. Press down.

  The operation of the operating mechanism 139 configured as described above will be described. The gas-to-load type capacity control apparatus 102 is a type of operating the operating mechanism 139 by stopping the supply of the operating gas into the casing 140.

  When the discharge capacity is not controlled, the working gas is supplied from the gas supply pipe 155 into the casing 140. At this time, the spring retainer 149 receives a force that is pushed upward in FIG. 4, which is a direction in which the coil spring 148 is contracted, by the pressure of the working gas supplied into the casing 140. Since this pushed-up force is larger than the elastic force of the coil spring 148, the spring retainer 149 is pushed upward against the elastic force of the coil spring 148. At this time, the amount of movement by which the spring retainer 149 is pushed upward is set to an amount of movement that provides a gap so that the spring retainer 149 does not contact the operating shaft 137. For this reason, the elastic force of the coil spring 148 is not applied to the operating shaft 137, and the suction valve 133 can open and close the suction portion 111.

  Next, when controlling the discharge capacity, the supply of the working gas from the working gas pipe 129 is stopped, so that the pressure due to the working gas in the casing 140 decreases. As the pressure decreases, the spring retainer 149 comes into contact with the operating shaft 137 by the elastic force of the coil spring 148, and the operating shaft 137 is pushed downward in FIG. The operation shaft 137 pushed downward is forced to keep the suction valve 133 in the open state by the suction valve 133 being in contact with the suction valve 133 at its end. As a result, the reciprocating compressor is controlled such that it cannot compress the low temperature gas supplied from the suction portion 111 into the compression chamber cylinder (not shown) and does not discharge the compressed gas.

JP 09-242675 A Japanese Utility Model Publication No. 01-124391

  By the way, as described above, in a reciprocating compressor that compresses a low temperature gas, due to the influence of the low temperature gas, an intake chamber cylinder, a casing fixed to the intake chamber cylinder, and an operation mechanism disposed in the casing are provided. The capacity controller is cooled. As the temperature decreases, the lubricant used in the operating mechanism freezes, the operating mechanism malfunctions due to this freezing, and the operating mechanism leaks due to the performance of the sealing material, Or the leakage of the low temperature gas by the side of a reciprocating compressor will generate | occur | produce.

  As a countermeasure for this problem, a structure is generally adopted in which the valve mechanism attached to the intake chamber cylinder and the operating mechanism are separated from each other so that the operating mechanism is always close to the external temperature of the operating mechanism. . However, in the capacity control device having such a structure, the operating mechanism has a shape that greatly protrudes from the cylinder for the intake chamber, so that the size of the reciprocating compressor is increased, and the reciprocating compressor is wide to install. There is a problem that installation space is required. In addition, with such a structure, there is a problem in that the work efficiency during maintenance of the reciprocating compressor and each operating mechanism itself is reduced.

  Then, an object of this invention is to provide the capacity | capacitance control apparatus of the reciprocating compressor which can solve the subject of the said related technique. An example of an object of the present invention is to provide a capacity control device for a reciprocating compressor that can improve the operation reliability of an operation mechanism without increasing the capacity control device and can improve workability during maintenance. The purpose is to do.

  In order to achieve the above-described object, a capacity control device for a reciprocating compressor according to the present invention includes a compression chamber cylinder having a fluid suction portion and a discharge portion, and a reciprocating operation in the compression chamber cylinder. An intake chamber of a reciprocating compressor comprising: a piston that compresses the intake chamber; an intake chamber cylinder that communicates with an intake portion of the compression chamber cylinder; and an intake valve that is provided in the intake chamber cylinder and opens and closes the intake portion The discharge capacity of the fluid from the cylinder for the compression chamber is controlled by being connected to the cylinder for the compression chamber. The capacity control device includes an operating shaft that keeps the suction portion open by contacting the suction valve, an operating mechanism that moves the operating shaft in the axial direction, and a mounting portion provided in the cylinder for the intake chamber. A casing that is fixed and supports the operating mechanism. Between the attachment portion of the intake chamber cylinder and the casing, a spacer is disposed adjacent to the attachment portion, and a heat absorbing member that absorbs heat from outside air is disposed adjacent to the casing. The spacer has a lower thermal conductivity than the mounting portion. The heat absorbing member has a higher thermal conductivity than the spacer.

  According to the present invention, it is possible to prevent the temperature of the attachment portion of the intake chamber cylinder from being transmitted to the operating mechanism without increasing the size of the entire capacity control device, and to improve the operation reliability of the operating mechanism. Therefore, this invention can improve the freedom degree of the installation position of a capacity | capacitance control apparatus, and can improve the workability | operativity at the time of a maintenance.

It is a sectional view showing a reciprocating compressor provided with a capacity control device of an embodiment. It is a top view which shows the capacity | capacitance control apparatus of embodiment. It is sectional drawing which shows the capacity | capacitance control apparatus of embodiment. It is sectional drawing which shows the state which the suction valve has closed the suction part in the capacity | capacitance control apparatus of embodiment. It is sectional drawing which shows the state in which the suction valve has opened the suction part in the capacity | capacitance control apparatus of embodiment. It is sectional drawing which shows the capacity | capacitance control apparatus with which the conventional reciprocating compressor is provided.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a reciprocating compressor provided with a capacity control device of an embodiment. As shown in FIG. 1, the reciprocating compressor 1 of the embodiment compresses a low temperature gas by reciprocating in a compression chamber cylinder 5 to which a low temperature gas as a fluid is supplied, and the compression chamber cylinder 5. A piston 6 and a piston drive mechanism 7 that drives the piston 6 are provided.

  As the fluid, a low-temperature gas having a temperature below zero and below 50 ° C. is supplied into the compression chamber cylinder 5. The cylinder 5 for compression chambers has the suction | inhalation part 11 which suck | inhales a low temperature gas, and the discharge part 12 which discharges the compressed gas in which the low temperature gas was compressed. A cylinder cover 13 is attached to the compression chamber cylinder 5. A labyrinth piston is used as the piston 6 of this embodiment.

  The piston drive mechanism 7 can rotate the piston rod 15 for driving the piston 6, the crosshead 16 connected to the piston rod 15, the connecting rod 17 for driving the crosshead 16, and the crosshead 16 and the connecting rod 17. And a crankshaft 19 for transmitting a driving force to the connecting rod 17. These members are supported by the frame 20.

  The piston rod 15 is supported by the guide bearing 21. The piston rod 15 is provided with a packing box 23, an oil retaining ring 24, and an oil draining ring 25 in this order from the piston 6 side. The crankshaft 19 is supported by a crank bearing 26 provided on the connecting rod 17.

  The reciprocating compressor 1 includes an intake chamber cylinder 31 communicated with the suction portion 11 of the compression chamber cylinder 5 and an intake chamber cylinder 31. The intake chamber cylinder 31 and the compression chamber cylinder 31 are provided in the intake chamber cylinder 31. And a valve cover 35 attached so as to fix the suction valve 33 to the intake chamber cylinder 31 via a presser foot 30.

  The reciprocating compressor 1 is provided in a discharge chamber cylinder 32 communicated with the discharge portion 12 of the compression chamber cylinder 5 and in the discharge chamber cylinder 32, and is compressed with the intake chamber cylinder 31. A discharge valve 34 that opens and closes the discharge portion 12 due to a pressure difference of the chamber cylinder 5, and a valve cover 36 that is attached so as to discharge the discharge valve 34 via the presser fitting 30 and fix the discharge valve 34 to the chamber cylinder 32. I have.

  The reciprocating compressor 1 configured as described above compresses the low-temperature gas sucked into the compression chamber cylinder 5 from the suction valve 33 by the piston 6 and discharges it as the compressed gas from the discharge portion 12. .

  The reciprocating compressor 1 of the embodiment includes a capacity control device 2 for controlling the discharge capacity of the compressed gas discharged from the discharge portion 12 of the compression chamber cylinder 5. It is a top view which shows the capacity | capacitance control apparatus 2 of embodiment to FIG. 2A. It is sectional drawing which shows the capacity | capacitance control apparatus 2 of embodiment to FIG. 2B.

  As shown in FIGS. 2A and 2B, the capacity control device 2 of the embodiment includes a first operation shaft 37 as an operation shaft that keeps the suction portion 11 open by contacting the suction valve 33, and a first operation A second operating shaft 38 that is arranged in alignment with the shaft 37, an operating mechanism 39 that moves the first and second operating shafts 37, 38 in the axial direction, and an operating mechanism 39 that is fixed to the intake chamber cylinder 31. And a casing 40 for supporting the above.

  In the capacity control device 2, a spacer 41 is disposed adjacent to the valve cover 35 between the valve cover 35 of the intake chamber cylinder 31 and the casing 40, as shown in FIG. An endothermic member 43 that absorbs heat from the outside air is disposed adjacent to the casing 40. Accordingly, the spacer 41, the heat absorbing member 43, and the casing 40 are arranged in this order on the valve cover 35 attached to the intake chamber cylinder 31, and are fixed to the valve cover 35 by the fixing bolts 42. Further, the heat absorbing member 43 has a heat absorbing plate 44 in which a plurality of heat absorbing holes 44 a that are in contact with the outside air around the casing 40 are formed. The heat absorbing plate 44 is a shaft of the first and second operating shafts 37 and 38. It is extended along the direction. As a result, the endothermic action of the endothermic member 43 is enhanced, so that the operating mechanism 39 can be further effectively prevented from being cooled, and the capacity control device 2 can be prevented from being enlarged.

  The spacer 41 is set to have a lower thermal conductivity than the valve cover 35 as an attachment portion of the casing 40. Further, the heat absorbing member 43 is set to have a higher thermal conductivity than the spacer 41. Therefore, the low temperature transmitted from the intake chamber cylinder 31 and the low temperature gas to the valve cover 35 is suppressed from being transmitted to the casing 40 by the spacer 41 having a relatively small thermal conductivity, and the heat absorbing member 43 having a relatively large thermal conductivity. By absorbing heat from the outside air, the low temperature transmitted to the spacer 41 can be brought close to the temperature of the outside air.

  In other words, the spacer 41 having a relatively low thermal conductivity is disposed adjacent to the valve cover 35 as an attachment portion of the intake chamber cylinder 31, thereby reducing the thermal conductivity from the intake chamber cylinder 31 side. The casing 40 is difficult to be cooled. In addition, since the heat absorbing member 43 having a relatively high thermal conductivity is disposed adjacent to the spacer 41, the heat absorbing member 43 absorbs heat from the outside air, so that the temperature of the heat absorbing member 43 becomes the temperature of the outside air. Since it acts so that it may be maintained, it is suppressed that the low temperature transmitted to the heat absorption member 43 is transmitted to the casing 40. For this reason, it is possible to prevent the operating mechanism 39 in the casing 40 from being cooled by the low temperature of the valve cover 35 cooled by direct contact with the low temperature gas.

  The first operating shaft 37 is provided at a position where one end is in contact with the suction valve 33, and is supported by a holder 45 fixed to the valve cover 35 so as to be movable in the axial direction. The second operating shaft 38 is provided at a position where one end abuts a later-described spring retainer 49 of the operating mechanism 39 and is supported by the casing 40 so as to be movable in the axial direction. Therefore, the movement direction of the first and second operating shafts 37 and 38 is restricted in the axial direction by the holder 45 and the casing 40.

  In addition, curved surfaces such as spherical surfaces are formed on both end surfaces of the first and second operating shafts 37 and 38 so that the contact areas with the members with which both end surfaces abut are reduced. As a result, the heat transfer efficiency from both end faces of the first and second operating shafts 37 and 38 is reduced, so that the intake chamber cylinder is provided via the first operating shaft 37, the partition plate 46 and the second operating shaft 38. Transmission of low temperature from the 31 side to the operating mechanism 39 is suppressed. That is, since the first operating shaft 37 is in direct contact with the low temperature gas and cooled by the low temperature gas, the first operating shaft 37 is a path for transmitting the low temperature to the operating mechanism 39. By rolling, low temperature transmission is prevented.

  The operating mechanism 39 includes a coil spring 48 for moving the second operating shaft 38 in the axial direction, and a spring retainer 49 for attaching the coil spring 48 in the casing 40, and the spring retainer 49 by the elastic force of the coil spring 48. Is configured to be movable.

  The capacity control device 2 includes a partition plate 46 disposed between the other end of the first operating shaft 37 and the other end of the second operating shaft 38, and a partition plate so as to cover the first operating shaft 37. 46, and a bellows 47 as a bellows-like member provided to be extendable in the axial direction of the first operating shaft 37.

  The casing 40 has a support wall 50 that supports the second operating shaft 38 so as to be movable in the axial direction. The support wall 50 is partitioned into a first space 51 that houses a bellows 47 that covers the first actuation shaft 37 and a second space 52 that houses the actuation mechanism 39. The bellows 47 is fixed to the valve cover 35 with fixing bolts 54. The support wall 50 is provided with a seal 53 that prevents leakage of the working gas. Therefore, the first operating shaft 37 and the second operating shaft 38 are partitioned by the bellows 47 and the partition plate 46 provided in the first space 51. For this reason, it is possible to further prevent the second operating shaft 38 and the operating mechanism 39 from being cooled by the intake chamber cylinder 31 and the first operating shaft 37.

  In addition, a gas supply pipe 55 that supplies working gas is communicated with the inside of the casing 40, and the pressure by the working gas is set to be larger than the elastic force of the coil spring 48. Therefore, when the working gas is supplied to the inside of the casing 40, there is a gap between the spring retainer 49 and the end of the second working shaft 38, and the second working shaft 38 is shown in FIG. 2B. It has not been moved downward.

  Next, details of the structure of the suction valve 33 will be described with reference to the drawings. FIG. 3A shows a cross-sectional view of the state in which the suction valve 33 closes the suction part 11. FIG. 3B shows a cross-sectional view of the state in which the suction valve 33 opens the suction part 11.

  As shown in FIGS. 3A and 3B, the suction valve 33 is configured by combining a valve presser 61, a valve plate 62, and a valve seat 63, which are arranged in order from the compression chamber cylinder 5 side. Each of the valve retainer 61, the valve plate 62, and the valve seat 63 is formed with a plurality of openings through which low temperature gas passes. The valve seat 63 is provided with a plurality of valve springs 64 at positions adjacent to the valve plate 62, and the valve plate 62 is biased toward the valve seat 63 by the valve spring 64. Further, the opening of the valve seat 63 and the valve plate 62 is shifted from each other. When the valve plate 62 moves to the valve seat 63 side and comes into contact with the valve seat 63, the opening of each other is changed. It is configured to be closed.

  As shown in FIG. 3A, when the pressure in the compression chamber cylinder 5 becomes larger than the pressure in the intake chamber cylinder 31, the suction valve 33 causes the valve plate 62 to be controlled by the pressure in the compression chamber cylinder 5. By being pressed by the seat 63, the valve plate 62 and the opening of the valve seat 63 are closed to each other. As a result, the suction valve 33 is in a state where the suction part 11 is closed.

  On the other hand, as shown in FIG. 3B, when the pressure in the intake chamber cylinder 31 becomes larger than the pressure in the compression chamber cylinder 5, the intake valve 33 causes the valve plate to move by the pressure in the intake chamber cylinder 31. 62 is moved toward the valve retainer 61 against the elastic force of the valve spring 64. As a result, the suction valve 33 is in a state in which the suction part 11 is opened.

  Further, in the present embodiment, the first and second operating shafts 37 and 38 are provided, and the first operating shaft 37 is covered with the partition plate 46 and the bellows 47. However, the present embodiment is limited to this configuration. is not. The spacer 41 and the heat absorbing member 43 are disposed between the intake chamber cylinder 31 and the casing 40 even when the partition plate 46 and the bellows 47 are omitted. Thus, it is possible to prevent low temperature from being transmitted from the intake chamber cylinder 31 to the casing 40. However, as in the above-described embodiment, the first and second operating shafts 37 and 38 are provided, and the first operating shaft 37 is covered with the partition plate 46 and the bellows 47, so that the intake air cooled by the low-temperature gas. It is possible to effectively suppress the low temperature of the chamber cylinder 31 from being transmitted to the operating mechanism 39 via the casing 40 and the second operating shaft 38, and to prevent the operating mechanism 39 from being cooled well.

  In the capacity control device 2 configured as described above, an operation in which the suction valve 33 is forcibly held in a state where the suction portion 11 is opened will be described.

  First, in the reciprocating compressor 1, the operation of compressing the low-temperature gas supplied from the suction portion 11 into the compression chamber cylinder 5 by the piston 6 and discharging it as the compressed gas from the discharge portion 12 is repeated. During this compression operation, the suction valve 33 and the discharge valve 34 disposed in the suction part 11 and the discharge part 12, respectively, cause a pressure difference between the compression chamber cylinder 5 and the suction chamber cylinder 31 and compression. The opening / closing operation is passively repeated by the pressure difference between the inside of the chamber cylinder 5 and the inside of the discharge chamber cylinder 32.

  When the compression operation by the reciprocating compressor 1 is performed, the displacement control device 2 is supplied with the working gas from the gas supply pipe 55 into the second space 52 of the casing 40, and the pressure by the working gas is reduced. The elastic force of the coil spring 48 of the operating mechanism 39 is larger. For this reason, the spring retainer 49 is moved in a direction away from the end of the second operating shaft 38 against the elastic force of the coil spring 48, and between the end of the second operating shaft 38 and the spring retainer 49. There is a gap. Therefore, the second operating shaft 38 is not pushed into the first operating shaft 37 side. At this time, the suction valve 33 can be opened and closed by a pressure difference between the inside of the compression chamber cylinder 5 and the inside of the discharge chamber cylinder 31.

  Next, when controlling the discharge capacity of the reciprocating compressor 1, the capacity control device 2 operates by stopping the supply of the working gas from the gas supply pipe 55 into the second space 52 of the casing 40. The pressure by the working gas becomes smaller than the elastic force of the coil spring 48 of the operating mechanism 39. For this reason, the spring retainer 49 is moved in a direction approaching the second operating shaft 38 by the elastic force of the coil spring 48, and the end of the second operating shaft 38 is brought into contact with the spring retainer 49. The second operating shaft 38 is moved in the axial direction by the spring retainer 49, and the first operating shaft 37 moves downward in FIG. 2B via the partition plate 46. Therefore, the end of the first operating shaft 37 contacts the suction valve 33 and presses the valve plate 62 of the suction valve 33 against the valve retainer 61 as shown in FIG. 3B. As a result, the suction valve 33 is forcibly held in a state where the suction part 11 is opened. As a result, the low temperature gas cannot be compressed in the compression chamber cylinder 5, and the discharge amount of the compressed gas by the reciprocating compressor 1 is controlled.

  As described above, the capacity control device 2 of the reciprocating compressor 1 is configured such that the spacer 41 and the heat absorbing member 43 are disposed between the intake chamber cylinder 31 and the casing 40, thereby It is possible to prevent the operating mechanism 39 from being cooled by the low temperature of the cover 35. Thereby, the operation reliability of the operation mechanism 39 can be improved without increasing the size of the entire capacity control device 2. Therefore, the installation conditions of the capacity control device 2 can be relaxed, and the workability during maintenance of the reciprocating compressor 1 and the capacity control device 2 can be improved.

  Further, the capacity control device 2 has first and second operation shafts 37 and 38, and the first operation shaft 37 is covered with the partition plate 46 and the bellows member 47 so that the intake chamber is cooled by the low temperature gas. It is possible to effectively suppress the low temperature of the valve cover 35 of the cylinder 31 from being transmitted to the operating mechanism 39 via the casing 40 and the second operating shaft 38.

  Further, the first and second operation shafts 37 and 38 are formed with curved surfaces such as spherical surfaces at both ends, so that the first operation shaft 37 and the suction valve 33, the first operation shaft 37 and the partition plate 46, and the second operation are performed. The contact areas between the shaft 38 and the partition plate 46, and between the second operating shaft 38 and the spring retainer 49 are reduced. Therefore, it is possible to suppress the low temperature on the valve cover 35 side from being transmitted to the operating mechanism 39 via the suction valve 33, the first and second operating shafts 37 and 38, and the partition plate 46.

DESCRIPTION OF SYMBOLS 1 Reciprocating compressor 2 Capacity | capacitance control device 5 Cylinder for compression chambers 6 Piston 11 Suction part 31 Cylinder for suction chambers 33 Suction valve 37 1st action shaft 38 2nd action shaft 39 Action mechanism 40 Casing 41 Spacer 43 Heat absorption member

Claims (6)

A compression chamber cylinder having a fluid suction portion and a discharge portion; a piston that reciprocates within the compression chamber cylinder to compress the fluid; and an intake chamber communicated with the suction portion of the compression chamber cylinder A reciprocating compressor provided in the intake chamber cylinder and opening and closing the intake portion, and connected to the intake chamber cylinder of the reciprocating compressor, the fluid from the compression chamber cylinder In the capacity control device that controls the discharge capacity,
An operating shaft that keeps the suction portion open by contacting the suction valve;
An actuation mechanism for moving the actuation shaft in the axial direction;
A casing that is fixed to a mounting portion provided in the intake chamber cylinder and supports the operating mechanism;
A spacer is disposed adjacent to the mounting portion between the mounting portion of the intake chamber cylinder and the casing, and a heat absorbing member that absorbs heat from outside air of the casing is adjacent to the casing. Arranged,
The spacer has a smaller thermal conductivity than the mounting portion,
A capacity control device for a reciprocating compressor, wherein the heat absorbing member has a thermal conductivity larger than that of the spacer.   The capacity control device for a reciprocating compressor according to claim 1, wherein the fluid at a temperature below 50 ° C. is sucked into the intake chamber cylinder. Curved surfaces are formed at both ends of the operating shaft,
The capacity control device for a reciprocating compressor according to claim 1, wherein one end of the operating shaft is in contact with the suction valve and the other end is in contact with the operating mechanism. The operating shaft has a first operating shaft provided at a position where one end abuts on the suction valve, and a second operating shaft provided at a position where one end contacts the operating mechanism with the first operating shaft aligned with the axis. An operating shaft,
A partition plate disposed between the other end of the first operation shaft and the other end of the second operation shaft; and the first operation shaft provided on the partition plate so as to cover the first operation shaft The capacity control device for a reciprocating compressor according to claim 1, further comprising: a bellows-like member that is extendable in the axial direction. The casing has a support wall that supports the second operating shaft so as to be movable in the axial direction;
5. The reciprocating compressor according to claim 4, wherein the support wall is divided into a first space that accommodates the bellows member that covers the first operation shaft and a second space that accommodates the operation mechanism. Capacity control device.   The capacity control device for a reciprocating compressor according to claim 4 or 5, wherein the first and second operating shafts have curved surfaces at both ends.

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