WO2012086319A1

WO2012086319A1 - Compressor

Info

Publication number: WO2012086319A1
Application number: PCT/JP2011/075454
Authority: WO
Inventors: 田口　幸彦
Original assignee: サンデン株式会社
Priority date: 2010-12-22
Filing date: 2011-11-04
Publication date: 2012-06-28
Also published as: JP5697024B2; CN103261688A; US20130272859A1; DE112011104568B4; DE112011104568T5; JP2012132372A

Abstract

[Problem] To achieve both the thermal insulation of a suction path, which is extended to a suction chamber so as to straddle a discharge chamber, and the adjustment of the degree of opening of the suction path using a simple configuration. [Solution] The cylinder head (104) of a compressor (100) has formed therein a suction chamber (119) which is disposed on a line extended from the axis of a drive shaft (106), a discharge chamber (120) which is disposed in an annular shape surrounding the suction chamber (119), and a communication path (104b) which is extended from the outside radially of the discharge chamber (120) to the suction chamber (119) so as to straddle the discharge chamber (120). The communication path (104b) has provided therein an opening degree adjusting valve (250) for adjusting the degree of opening of the communication path (104b) according to the flow rate of the refrigerant. The opening degree adjusting valve (250) is provided with a path forming member (254) which is formed in a cylindrical shape using a heat insulating material and which is inserted in the communication path (104b). The path forming member (254) is provided integrally with a restriction section (254b) for restricting the movement of a valve body (251) in the valve closing direction.

Description

Compressor

The present invention relates to a compressor provided with an opening adjustment valve that adjusts the opening of a suction passage that extends to the suction chamber across the discharge chamber.

Conventionally, in a reciprocating compressor used in a vehicle air conditioner system, a suction reed valve causes self-excited vibration when refrigerant is sucked to generate pulsation of suction pressure, and the pressure pulsation propagates to an upstream evaporator or the like. An abnormal noise sometimes occurred.
In order to reduce the pulsation of the suction pressure, Patent Documents 1 and 2 disclose a compressor provided with an opening degree adjusting valve for adjusting the opening degree of the suction passage.
Patent Document 3 discloses a compressor in which the suction refrigerant is covered with a heat insulating member in order to prevent the intake refrigerant from being heated in the suction passage and rising in temperature.

JP 2000-136776 A JP 2005-337232 A JP 2005-147021 A

Incidentally, as disclosed in Patent Document 2, in a reciprocating compressor in which a suction passage extends to the suction chamber across the discharge chamber, the suction refrigerant in the suction passage is heated by the high-temperature discharge refrigerant in the discharge chamber. It is easy to be done. For this reason, the temperature of the refrigerant | coolant suck | inhaled by a cylinder bore rises, the density of a refrigerant | coolant becomes small, and it became a factor which reduces the performance of a compressor.
Therefore, the structure disclosed in Patent Document 3 that insulates the suction passage with a heat insulating member is applied to a compressor as disclosed in Patent Documents 1 and 2, and the heating of the suction refrigerant in the suction passage is suppressed. It is desirable. However, when a dedicated heat insulating member is added, there is a problem that the cost of the compressor increases.

Accordingly, an object of the present invention is to provide a compressor capable of performing heat insulation of a suction passage extending over the discharge chamber to the suction chamber and adjusting the opening of the suction passage with a simple structure.

In order to achieve the above object, a compressor according to the present invention includes a suction chamber disposed on an extension of an axis of a drive shaft, a discharge chamber disposed in an annular shape surrounding the suction chamber, and a diameter of the discharge chamber. In a compressor comprising a housing formed with a suction passage extending from the outside in the direction to the suction chamber across the discharge chamber, and an opening adjustment valve for adjusting the opening of the suction passage. The opening adjusting valve is formed in a cylindrical shape with a heat insulating material, is inserted into a portion of the suction passage that straddles the discharge chamber, and has a restriction portion that integrally restricts movement of the valve body. I was prepared to.
In such a configuration, since the passage forming member inserted into the suction passage is formed of a heat insulating material, heat exchange between the suction passage and the discharge chamber is suppressed. Further, since the passage forming member regulates the movement of the valve body of the opening adjustment valve, the passage forming member functions as a component of the opening adjustment valve while insulating the suction passage.

Here, the opening adjustment valve includes a valve housing that is formed in a bottomed cylindrical shape and accommodates the valve body, and the outer periphery of the downstream end of the passage forming member is fitted to the inner periphery of the open end of the valve housing. The valve housing is locked to the downstream end of the passage forming member, while the valve body is fitted in the valve housing and moves along the axial direction of the valve housing, and is downstream of the passage forming member. When the valve body comes into contact with the restriction portion provided integrally with the annular end portion on the side, movement of the valve body in a direction approaching the downstream end of the passage forming member can be restricted.
In such a configuration, the outer periphery of the downstream end of the passage forming member is fitted to the inner periphery of the open end of the valve housing, so that the open end of the valve housing is narrowed at the downstream end of the passage forming member, and the movement space of the valve body is reduced. The passage forming member projects in an annular shape. And a valve body contact | abuts to the control part integrally provided in the annular edge part of the downstream of a channel | path formation member, and a movement of a valve body is controlled.

An annular gap may be provided between the outer periphery of the passage forming member and the inner periphery of the suction passage.
In such a configuration, by providing a gap between the outer periphery of the passage forming member and the inner periphery of the suction passage, heat exchange between the fluid in the discharge chamber and the fluid in the suction passage can be further suppressed.

In addition, it is preferable that a communication hole that communicates the annular gap and the internal space of the passage forming member is provided in the passage forming member.
In such a configuration, the air in the gap between the outer periphery of the passage forming member and the inner periphery of the suction passage can be discharged through the communication hole when evacuating before the fluid such as the refrigerant is sealed. it can.

Further, the upstream end portion of the passage forming member can be locked to the inner peripheral wall of the suction passage by restricting the movement of the suction passage in the axial direction.
In such a configuration, the passage forming member, that is, the entire opening adjustment valve can be positioned at a predetermined position in the suction passage.

Here, an enlarged diameter portion for inserting the flange of the external fluid circuit is formed at the upstream end of the suction passage through a step portion, and at the upstream end portion of the passage forming member, A flange to be fitted is integrally formed, and the flange of the passage forming member is sandwiched between the flange of the external fluid circuit and the step portion of the suction passage in the axial direction of the suction passage, whereby the axial direction of the suction passage The movement of the passage forming member to the side can be restricted.
In such a configuration, the flange formed at the upstream end of the passage forming member is sandwiched between the flange of the external fluid circuit and the step portion of the suction passage, so without adding a retaining member or the like of the passage forming member, The passage forming member can be positioned at a predetermined position in the suction passage.

According to the compressor according to the present invention, the passage forming member functions as a component of the opening adjustment valve by restricting the movement of the valve body while insulating the suction passage. A compressor capable of adjusting the opening degree with a simple structure, suppressing a decrease in compression performance due to a rise in the temperature of the suction fluid, and suppressing pulsation of the suction pressure can be provided at a relatively low cost.

It is a longitudinal section of a compressor concerning an embodiment of the present invention. It is a longitudinal cross-sectional view of the opening degree adjustment valve which comprises the compressor which concerns on embodiment of this invention, (a) is a longitudinal cross-sectional view which shows the maximum valve opening state, (b) is a longitudinal cross-sectional view which shows the minimum valve opening state It is. It is the elements on larger scale which show the attachment state of the opening degree adjustment valve with respect to the compressor which concerns on embodiment of this invention.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 shows a compressor according to an embodiment, and this compressor is a swash plate type variable capacity reciprocating compressor 100 used in a vehicle air conditioner system.

The compressor 100 includes a cylinder block 101, a front housing 102 connected to one end of the cylinder block 101, and a cylinder head 104 connected to the other end of the cylinder block 101 via a valve plate 103.
A crank chamber 105 is defined by the cylinder block 101 and the front housing 102, and the drive shaft 106 has radial and thrust bearings 113 with respect to the cylinder block 101 and the front housing 102 so as to cross the crank chamber 105. , 115 and 116 are rotatably supported.

The front end portion of the drive shaft 106 penetrates through the boss portion 102a of the front housing 102 and protrudes to the outside of the front housing 102. A drive source such as a vehicle engine or motor is connected to the front end portion protruding outside the power transmission device. It is connected via.
A shaft seal device 112 is provided between the drive shaft 106 and the boss portion 102a to block the crank chamber 105 inside the front housing 102 from the outside.

In the crank chamber 105, a rotor 108 is fixed to the drive shaft 106, and a swash plate 107 is attached to the rotor 108 via a connecting portion 109.
The swash plate 107 is supported so that the drive shaft 106 passes through a through-hole formed in the center of the swash plate 107, rotates integrally with the drive shaft 106, and is slidable and tiltable in the axial direction of the drive shaft 106. . Further, the rotor 108 is rotatably supported by a thrust bearing 114 disposed on the front end side inner wall of the front housing 102.

Between the rotor 108 and the swash plate 107, a coil spring 110 that urges the swash plate 107 in a direction to reduce the inclination angle of the swash plate 107 is mounted. A coil spring 111 for biasing the swash plate 107 is attached between the retaining ring 130 fixed to the drive shaft 106 and the swash plate 107 so as to increase the tilt angle of the swash plate 107.
The cylinder block 101 is formed with a plurality of cylinder bores 101 a so as to surround the drive shaft 106. A piston 117 is accommodated in each cylinder bore 101a so as to be able to reciprocate in the axial direction of the drive shaft 106. Each piston 117 is engaged with the outer peripheral portion of the swash plate 107 via a shoe 118. When the swash plate 107 rotates together with the drive shaft 106, each piston 117 reciprocates in the cylinder bore 101a.

The cylinder head 104 is provided with a suction chamber 119 on an extension line of the drive shaft 106 and a discharge chamber 120 that surrounds the suction chamber 119 in an annular shape. The suction chamber 119 communicates with the cylinder bore 101a via a communication hole 103a provided in the valve plate 103 and a suction valve (not shown). The discharge chamber 120 communicates with the cylinder bore 101a via a discharge valve (not shown) and a communication hole 103b provided in the valve plate 103.
The front housing 102, the cylinder block 101, the valve plate 103, and the cylinder head 104 are fastened by a plurality of through bolts 140 via a gasket (not shown) to form a compressor housing.

A muffler 121 is provided outside the cylinder block 101. The muffler 121 is formed by connecting a bottomed cylindrical lid member 122 to a cylindrical wall 101b erected on the outer surface of the cylinder block 101 via a seal member. A discharge port 122a is formed in the lid member 122, and the discharge port 122a is connected to a condenser of the vehicle air conditioner system.
A communication path 124 that communicates the muffler space 123 in the muffler 121 and the discharge chamber 120 is formed across the cylinder block 101, the valve plate 103, and the cylinder head 104. The muffler 121 and the communication path 124 include the discharge chamber 120 and the discharge port. A discharge passage communicating with 122a is formed, and the muffler 121 forms an expansion space along the discharge passage.

Also, a check valve 200 for opening and closing the inlet of the muffler 121 is disposed in the muffler 121. The check valve 200 is disposed at a connection portion between the communication passage 124 and the muffler space 123 and operates in response to a pressure difference between the upstream communication passage 124 and the downstream muffler space 123. Specifically, the valve is opened when the pressure Pu in the communication passage 124 is higher than the pressure Pd in the muffler space 123 by a predetermined value SL or more, and is closed when the pressure difference condition is not satisfied. That is, if Pu−Pd> SL> 0, the valve is opened, and if Pu−Pd ≦ SL> 0, the valve is closed.

The cylinder head 104 is formed with a suction port 104a and a communication path 104b that connects the suction port 104a and the suction chamber 119. The suction chamber 119 is connected to an evaporator of the vehicle air conditioner system through a suction passage 104c formed by the communication passage 104b and the suction port 104a. The suction passage 104c extends linearly along the radial direction of the cylinder head 104 so as to straddle the discharge chamber 120 from the radially outer side of the cylinder head 104.

The communication passage 104b is provided with an opening adjustment valve 250 that adjusts the opening of the suction passage 104c.
The opening adjustment valve 250 is formed of a heat insulating material in a cylindrical shape and is a valve housing 253 provided with a passage forming member 254 inserted into the communication passage 104b and an outlet hole 253a locked on the downstream side of the passage forming member 254. And a valve body 251 housed in the valve housing 253, and a compression coil spring 252 that urges the valve body 251 in a direction in which the opening of the suction passage 104c decreases, in other words, in a valve closing direction.

Then, the refrigerant sucked into the suction port 104a is introduced into the suction chamber 119 through the internal space 254a of the passage forming member 254 and the outlet hole 253a of the valve housing 253.
The opening adjustment valve 250 adjusts the opening of the suction passage 104c following the pressure difference between the internal space 254a of the passage forming member 254 constituting the suction passage 104c and the suction chamber 119, that is, a change in the refrigerant flow rate. The opening adjustment valve 250 reduces the opening of the suction passage 104c by the closing biasing force of the compression coil spring 252 when the refrigerant flow rate decreases, and resists the closing biasing force of the compression coil spring 252 when the refrigerant flow rate increases. Thus, the opening degree of the suction passage 104c is increased.

In this embodiment, the cylinder head 104 is formed of an aluminum-based material, while the valve housing 253, the passage forming member 254, and the valve body 251 are polyamide-based materials that are heat insulating materials having a lower thermal conductivity than the aluminum-based material. It is made of a resin material such as resin.
The detailed structure of the opening adjustment valve 250 will be described later in detail.

A capacity control valve 300 is attached to the cylinder head 104.
The capacity control valve 300 adjusts the opening degree of the communication passage 125 that communicates the discharge chamber 120 and the crank chamber 105, and controls the amount of refrigerant discharged into the crank chamber 105.
In addition, the refrigerant in the crank chamber 105 passes through the gaps between the

bearings

115 and 116 and the drive shaft 106 and enters the suction chamber 119 through the space 127 formed in the cylinder block 101 and the orifice 103 c formed in the valve plate 103. Inflow.

Therefore, the displacement control valve 300 adjusts the amount of refrigerant introduced into the crank chamber 105 to change the pressure in the crank chamber 105, thereby changing the inclination angle of the swash plate 107, that is, the stroke amount of the piston 117. The discharge capacity of the machine 100 can be controlled.
The capacity control valve 300 adjusts the energization amount to the built-in solenoid based on the external signal, and the pressure of the suction chamber 119 introduced into the pressure sensing chamber of the capacity control valve 300 via the communication path 126 is a predetermined value. The discharge capacity of the compressor 100 is controlled so that Further, the capacity control valve 300 controls the discharge capacity of the compressor 100 to the minimum by forcibly opening the communication path 125 by shutting off the power supply to the built-in solenoid.

Next, the structure of the opening adjustment valve 250 will be described in detail with reference to FIGS.
The valve housing 253 of the opening adjustment valve 250 is formed in a bottomed cylindrical shape having a plurality of outlet holes 253a in the peripheral wall, and the outer periphery of the downstream end of the passage forming member 254 is fitted to the inner periphery of the open end of the valve housing 253. In combination, an internal space 253b that is continuous with the internal space 254a of the passage forming member 254 is formed.

A groove 253e is formed on the inner periphery of the open end of the valve housing 253, while a protrusion 254e is formed on the outer periphery of the downstream end of the passage forming member 254. Then, when the passage forming member 254 and the valve housing 253 are fitted together, the protrusions 254e are allowed to be elastically deformed and fitted into the inner periphery of the open end of the valve housing 253, and the elastic restoring force is used. The projection 254e is fitted into the groove 253e so that the passage forming member 254 and the valve housing 253 are fitted in a state of being prevented from coming off.

The valve body 251 is formed in a bottomed cylindrical shape having an outer diameter that fits in the internal space 253b of the valve housing 253, and the bottom portion is formed in the internal space 253b of the valve housing 253 with the open end side of the internal space 253b. Inserted.
Then, the valve body 251 moves in the internal space 253b of the valve housing 253 along the axial direction, whereby the opening area of the outlet hole 253a that opens in the peripheral wall of the valve housing 253 is variable.

That is, when the valve body 251 approaches the bottom side of the internal space 253b of the valve housing 253, the area of the outlet hole 253a closed by the peripheral wall of the valve body 251 decreases, and the opening degree of the suction passage 104c increases. When the body 251 moves away from the bottom side of the internal space 253b of the valve housing 253, the area of the outlet hole 253a closed by the peripheral wall of the valve body 251 increases, and the opening degree of the suction passage 104c decreases.
The compression coil spring 252 is disposed between the bottom part of the valve housing 253 and the bottom part of the valve body 251, and the opening degree of the suction passage 104 c is reduced in the valve body 251 at the open end side of the internal space 253 b of the valve housing 253. It is a means to urge toward the side to do.

The passage forming member 254 is formed in a cylindrical shape having one end fitted inside the open end of the valve housing 253, and contacts the bottom wall of the valve body 251 toward the passage forming member 254 side of the valve body 251. A plurality of restricting portions 254b for restricting the movement, that is, the movement in the direction of decreasing the opening of the suction passage 104c, are formed so as to protrude from the annular end portion of the one end.
The restricting portion 254b is formed in an arc shape having the same inner and outer diameters as the inner and outer diameters of the cylindrical portion of the passage forming member 254, and the heights of the restricting portions 254b are aligned.

In a state where the bottom wall of the valve body 251 is in contact with the restricting portion 254b and the movement of the valve body 251 is restricted, the suction passage 104c has the minimum opening, but in this embodiment, the minimum opening is all It is set so that the outlet hole 253a is slightly opened instead of the closed state. Thereby, when the refrigerant circulation stops, the pressure in the suction chamber 119 and the pressure on the suction port 104a side become equal.
The number of restricting portions 254b may be one, but it is preferable to provide, for example, two to four restricting portions 254b at equal angular intervals.

In addition, the downstream end of the passage forming member 254 is used as a restricting portion without forming the restricting portion 254b protruding from the downstream end of the passage forming member 254, and the bottom wall of the valve body 251 and the passage are formed. It is possible to make a structure in which the member 254 abuts annularly.
However, in such a structure, the bottom wall of the valve body 251 and the passage forming member 254 are in close contact with each other in an annular shape, so that it is not possible to secure a path for connecting the suction passage 104c and the suction chamber 119. Therefore, in the present embodiment, a restricting portion 254b protruding from the annular end portion on the downstream side of the passage forming member 254 is provided, and in a state where the bottom wall of the valve body 251 is in contact with the restricting portion 254b, the downstream of the passage forming member 254 is provided. A gap is formed between the annular end on the side and the bottom wall of the valve body 251.

On the other hand, the movement of the valve body 251 in the direction of increasing the opening degree of the suction passage 104c, in other words, the direction approaching the bottom of the valve housing 253 is such that the open side end of the tubular portion of the valve body 251 It is regulated by the contact of the bottom wall of H.253.
A small hole 253b is formed in the bottom wall of the valve housing 253 to communicate the back space 250b of the valve body 251 and the suction chamber 119, so that the valve body 251 responds to a pressure difference between the upstream side and the downstream side. And the opening degree of the suction passage 104c is adjusted.

A flange 253c is formed at the open end of the valve housing 253. On the other hand, the passage forming member 254 is formed with a circumferential groove 250c together with the flange 253c when the valve housing 253 and the passage forming member 254 are fitted. A flange 254f is formed.
Then, an O-ring 255 formed of an elastomer is attached to the circumferential groove 250c, and the O-ring 255 protruding from the circumferential groove 250c is crushed and fitted into the communication path 104b, thereby opening the opening. The regulating valve 250 is elastically supported by the O-ring 255 with respect to the communication path 104b.

Also, the inner diameter of the suction port 104a is made larger than the inner diameter of the communication passage 104b, and a stepped portion 104e is formed at the boundary portion between the communication passage 104b and the suction port 104a, while at the upstream end of the passage forming member 254. Is formed with a flange 254c that fits into the suction port 104a, which is a diameter-expanded portion continuous with the communication path 104b.
That is, the diameter of the flange 254c is set to be larger than the inner diameter of the communication passage 104b and smaller than the inner diameter of the suction port 104a, and the opening degree adjusting valve 250 including the passage forming member 254 has the valve housing 253 side downstream. Then, the suction port 104a is inserted into the communication path 104b, and the flange 254c abuts against the step 104e at the boundary between the communication path 104b and the suction port 104a, so that the opening adjustment valve 250 is connected to the communication path 104b. Positioning is done.

When the flange 400 of the external refrigerant circuit is inserted and connected to the suction port 104a, the flange 254c of the passage forming member 254 is sandwiched between the tip portion 400a and the step portion 104e of the flange 400, and the opening adjustment valve 250 Removal is prevented by the flange 400.
When the opening adjustment valve 250 is removed from the cylinder head 104, the tool is inserted from a plurality of notches 254g formed on the flange 254c, and the flange 254c is hooked on the tool and removed.

A groove 400b is formed on the outer peripheral surface of the flange 400 of the external refrigerant circuit, and an O-ring 259 formed of an elastomer is attached to the groove 400b so that a clearance between the inner peripheral surface of the suction port 104a and the outer peripheral surface of the flange 400 is obtained. Is sealed.
Further, in a state where the opening adjustment valve 250 is positioned with respect to the communication path 104b, the communication path is formed such that an annular gap 260 is formed between the inner periphery of the communication path 104b and the outer periphery of the path forming member 254. The inner diameter of 104b and the outer diameter of the passage forming member 254 are set. Further, a communication hole 254 d for communicating the gap 260 with the internal space 254 a of the passage forming member 254 is formed in the peripheral wall of the passage forming member 254.

Next, the operation of the opening degree adjusting valve 250 will be described.
As described above, the housing of the cylinder head 104 and the like is formed of a metal material such as an aluminum material, while the valve housing 253, the passage forming member 254, and the valve body 251 constituting the opening adjustment valve 250 are formed of a resin material. Is done.

Since the communication path 104b extends across the discharge chamber 120, if the heat insulating property between the communication path 104b and the discharge chamber 120 is low, the suction refrigerant in the communication path 104b is exchanged with the refrigerant discharged in the discharge chamber 120. Heat is transferred and the temperature of the suction refrigerant rises. However, in the compressor 100, the passage forming member 254 formed in a cylindrical shape with a resin material having extremely low thermal conductivity as compared with the aluminum-based material that is the molding material of the cylinder head 104 is inserted into the communication passage 104b. Therefore, the heat of the discharge refrigerant in the discharge chamber 120 is suppressed from being transmitted to the suction refrigerant in the communication path 104b, and the temperature rise of the suction refrigerant is suppressed.

Further, a gap 260 is formed between the inner periphery of the communication passage 104b and the outer periphery of the passage forming member 254, and the opening degree adjusting valve 250 is elastically supported by the O-ring 255 with respect to the communication passage 104b and opened. By reducing the area where the passage forming member 254 and the valve housing 253 of the degree adjusting valve 250 are in direct contact with the communication passage 104b, the heat insulating effect by the passage forming member 254 is further enhanced.

Further, a communication hole 254d is formed in the passage forming member 254 to communicate the gap 260 between the inner periphery of the communication passage 104b and the outer periphery of the passage forming member 254 and the internal space 254a of the passage forming member 254. Thereby, in the vacuuming performed to discharge the air in the compressor 100 when the refrigerant is sealed in the refrigerant circuit, the air in the gap 260 is easily discharged, and the refrigerant is discharged from the gap between the flange 254c and the suction port 104a. When oil or oil enters the gap 260, the refrigerant or oil can easily escape to the internal space 254a side.

Next, the effect of the opening adjustment valve 250 will be described.
In the compressor 100, the passage forming member 254 functioning as a heat insulating member is inserted into the communication passage 104b to suppress the temperature rise of the refrigerant in the communication passage 104b. The performance degradation of the compressor 100 can be prevented.

Furthermore, a clearance 260 is provided between the inner periphery of the communication passage 104b and the outer periphery of the passage formation member 254, and the passage formation member 254 is elastically supported by the O-ring 255 with respect to the communication passage 104b. The heat insulation performance of 254 is further improved, and the temperature rise of the refrigerant in the communication path 104b can be more effectively suppressed.
Moreover, since the opening degree adjustment valve 250 adjusts the opening degree of the suction passage 104c according to the refrigerant flow rate, the pulsation of the suction pressure can be reduced, and the generation of noise due to the pulsation of the suction pressure can be suppressed.

In addition, the passage forming member 254 functions as a heat insulating member of the communication passage 104b, and integrally includes a restriction portion 254b that restricts the movement of the valve body 251 of the opening adjustment valve 250, and a part of the opening adjustment function. Therefore, the structure of the compressor 100 can be simplified and the cost increase of the compressor 100 can be suppressed as compared with the case where the heat insulating member and the member that restricts the movement of the valve body 251 are individually provided.

Although the contents of the present invention have been specifically described with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.
For example, in the above embodiment, the axis of the suction passage 104 c is substantially orthogonal to the axis of the drive shaft 106, and the suction passage 104 c extends linearly from the outside in the radial direction of the cylinder head 104 so as to cross a part of the discharge chamber 120. However, the suction passage 104c only needs to straddle the discharge chamber 120, and the extending direction of the suction passage 104c is not limited to the radial direction, and the axis of the suction passage 104c is relative to the axis of the drive shaft 106. May be inclined.

In the embodiment, the passage forming member 254 is formed of a polyamide-based resin material, but may be formed of other resin materials such as polyphenylene sulfide. Furthermore, the passage forming member 254 can be formed using a layered material in which the surface of the metal material is covered with a resin film having a heat insulating function. In the present application, the material having the layer structure as described above is referred to as a heat insulating material.

In the embodiment, the opening adjustment valve 250 is configured not to be fully closed even in the minimum opening state. However, the opening adjustment valve 250 is a check valve that is fully closed in the minimum opening state. can do.
Further, if the flange 254c side of the passage forming member 254 is supported with respect to the communication passage 104b via an O-ring, the heat insulation effect can be further enhanced.
The compressor 100 may be a reciprocating compressor provided with an electromagnetic clutch, a compressor not provided with a clutch, or a compressor driven by a motor.

DESCRIPTION OF SYMBOLS 100 ... Compressor, 101 ... Cylinder block, 101a ... Cylinder bore, 102 ... Front housing, 103 ... Valve plate, 104 ... Cylinder head, 104a ... Suction port, 104b ... Communication passage, 104c ... Suction passage, 105 ... Crank chamber, 106 DESCRIPTION OF SYMBOLS ... Drive shaft, 107 ... Swash plate, 250 ... Opening adjustment valve, 251 ... Valve body, 252 ... Compression coil spring, 253 ... Valve housing, 253a ... Outlet hole, 254 ... Passage formation member, 254b ... Restriction part, 254c ... Flange 254d ... communication hole, 260 ... gap

Claims

A suction chamber disposed on an extension of the axis of the drive shaft, a discharge chamber disposed in an annular shape surrounding the suction chamber, and extending from the radially outer side of the discharge chamber to the suction chamber across the discharge chamber. A housing in which a suction passage is formed;
An opening adjustment valve for adjusting the opening of the suction passage;
In the compressor comprising: the opening adjustment valve,
It is formed in a cylindrical shape with a heat insulating material, and is inserted into a portion of the suction passage that straddles the discharge chamber, and further includes a passage forming member that integrally includes a restriction portion that restricts movement of the valve body. Compressor.
The opening adjustment valve includes a valve housing that is formed in a bottomed cylindrical shape and accommodates the valve body, and the downstream end outer periphery of the passage forming member is fitted to the open end inner periphery of the valve housing, and the passage While locking the valve housing to the downstream end of the forming member,
The valve body is fitted in the valve housing and moves along the axial direction of the valve housing, and the valve body is provided on the restriction portion provided integrally with the annular end portion on the downstream side of the passage forming member. 2. The compressor according to claim 1, wherein movement of the valve body in a direction approaching a downstream end of the passage forming member is restricted by the contact.
The compressor according to claim 1, wherein an annular gap is provided between an outer periphery of the passage forming member and an inner periphery of the suction passage.
4. The compressor according to claim 3, wherein a communication hole that communicates the annular gap and the internal space of the passage forming member is provided in the passage forming member.
The compressor according to claim 1, wherein the upstream end portion of the passage forming member is locked to the inner peripheral wall of the suction passage while restricting movement of the suction passage in the axial direction.
A diameter-enlarged portion for inserting a flange of the external fluid circuit is formed at the upstream end of the suction passage through a step portion, and is fitted into the diameter-enlarged portion at the upstream end portion of the passage forming member. A flange is integrally formed, and the flange of the passage forming member is sandwiched between the flange of the external fluid circuit and the step portion of the suction passage in the axial direction of the suction passage, whereby the suction passage in the axial direction is formed. The compressor according to claim 5, wherein movement of the passage forming member is restricted.