JP3289454B2 - One-side piston type variable displacement swash plate compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-sided piston type variable displacement swash plate type compressor used in a vehicle air conditioner or the like.

[0002]

2. Description of the Related Art Conventional single-sided piston type variable displacement swash plate type compressors are disclosed, for example, in JP-A-60-177578, JP-A-61-215468, and JP-A-61-2.
Japanese Patent Laid-Open Nos. 55285, 62-203980 and 62-87679 are known.

In these conventional configurations, a front housing is arranged on one side of a cylinder block having a plurality of cylinder bores, and a crank chamber is formed in the front housing. A swash plate connected to a piston in a cylinder bore is provided in the crank chamber. A rear housing is disposed on the other side of the cylinder block via a valve plate, and a suction chamber and a discharge chamber are defined in the rear housing. The valve plate is formed with a suction valve for connecting the cylinder bore to the suction chamber and a discharge valve for connecting the cylinder bore to the discharge chamber.

A communication passage is formed between one of the discharge chamber and the suction chamber and the crank chamber, and a valve control device having an open / close valve is provided in the communication passage. The valve control device opens and closes the on-off valve according to the cooling load. By opening and closing the on-off valve, the pressure in the crank chamber is adjusted, the inclination angle of the swash plate is changed, and the compression capacity is controlled.

For example, FIG. 1 of Japanese Patent Application Laid-Open No. 61-255285, page 13 of the specification, lower right column, line 13 to page 5, upper left column, line 19, Japanese Patent Application Laid-Open No. 62-203980 In FIG. 1 and the specification, page 4, lower left column, line 7 to lower right column, line 20, a control valve 29 having an open / close valve 36 is disclosed. Also, Japanese Patent Application Laid-Open No. 61-21 / 1986
A valve control mechanism 39 having a spherical valve element 30 is disclosed in FIG. 1 of JP-A-5468 and FIG. 1 and in the specification, page 3, lower right column, line 15 to page 4, upper right column, line 15. Furthermore, Japanese Unexamined Patent Publication No. Sho 62
In FIG. 1 and the specification, page 11, lower right column, page 2, line 11 to page 3, upper left column, line 6, a needle valve 15 is provided.
A bellows 15 having a is disclosed.

[0006]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. Sho 61
In Japanese Unexamined Patent Publication No. 255285/1987, Japanese Patent Application Laid-Open No. 62-203980 and Japanese Patent Application Laid-Open No. 61-215468, the on-off valve 36 and the spherical valve body 30 are separate from the valve plate between the cylinder block and the rear housing. Is formed.
Therefore, there are problems that the number of parts is large, the structure is complicated, and assembly is troublesome. In addition, it is necessary to secure an arrangement space for the on-off valve 36 and the spherical valve body 30 which are separate from the valve plate, and the outer shape of the compressor is increased. In particular, in JP-A-61-255285 and JP-A-62-203980, since the control valve 29 is arranged so as to protrude outside the rear housing, the arrangement space for the on-off valve 36 is secured. That was a big increase in size.

Japanese Patent Application Laid-Open No. 62-87679 discloses a bellows 1 in which a needle valve 15a performs an expanding and contracting operation.
5, the needle valve 15a may be perturbed and the opening / closing operation at a predetermined position may not be performed. For this reason, there is no problem in the opening operation of the needle valve 15a due to the contraction of the bellows 15, but when the bellows 15 is extended, there is a possibility that the needle valve 15a does not reliably perform the closing operation.

The present invention has been made by paying attention to such problems existing in the prior art. The aim is to provide a single-sided piston type variable displacement swash plate compressor that can simplify the structure by reducing the number of parts, simplify the assembly, and reliably open and close the on-off valve. To provide. Another object of the present invention is to provide a one-sided piston type variable displacement swash plate type compressor capable of suitably performing displacement control.

[0009]

In order to achieve the above object, according to the present invention, a cylinder block having a plurality of cylinder bores and a crank chamber disposed on one side of the cylinder block are provided. A front housing, a swash plate that is provided to be tiltable in the crank chamber and is connected to a piston in a cylinder bore, and a rear housing that is arranged on the other side of the cylinder block and has a suction chamber and a discharge chamber are provided. A valve plate disposed between the rear housing and the cylinder block, the valve plate having at least one of a suction valve for connecting the cylinder bore to the suction chamber and a discharge valve for connecting the cylinder bore to the discharge chamber; An on-off valve provided in a communication passage communicating one of the suction chambers with the crank chamber, and a valve control device provided corresponding to the on-off valve and controlling opening and closing of the on-off valve according to a cooling load. Have. The pressure in the crank chamber is adjusted by opening and closing the on-off valve to change the inclination angle of the swash plate and adjust the compression capacity. According to the first aspect of the present invention, the on-off valve is constituted by a reed valve formed on a valve plate.

According to a second aspect of the present invention, in addition to the first aspect, the valve plate includes a valve seat plate and a valve forming plate superimposed on the valve seat plate. The on-off valve is formed integrally with the valve forming plate, and the valve control device is provided on the rear housing corresponding to the on-off valve.

According to a third aspect of the present invention, in addition to the first aspect, the valve plate includes a valve seat plate and a valve forming plate superposed on the valve seat plate. The on-off valve is formed integrally with the valve forming plate, and the valve control device is provided on the cylinder block corresponding to the on-off valve.

According to a fourth aspect of the present invention, in addition to the first aspect of the present invention, a communication passage is provided between the discharge chamber and the crank chamber, and the pressure in the discharge chamber is controlled by an on-off valve. The on-off valve is arranged at a position acting as a force in the closing direction with respect to.

According to a fifth aspect of the present invention, in addition to any one of the first to fourth aspects, the valve control device further includes a setting mechanism for setting the opening / closing timing of the on-off valve. I have.

According to a sixth aspect of the present invention, in addition to the first aspect, a part of the communication passage is defined by a groove formed in an end face of the cylinder block and the valve plate. It is a void.

[0015]

According to the one-sided piston type variable displacement swash plate type compressor according to the first aspect of the present invention, according to the cooling load during operation,
The on-off valve is opened and closed by the valve control device. Accordingly, the communication path between the discharge chamber or the suction chamber and the crank chamber is opened and closed, the pressure in the crank chamber is adjusted, the inclination angle of the swash plate changes, and the compression capacity changes.

Further, in this variable displacement swash plate type compressor, an on-off valve for controlling the displacement is constituted by a reed valve formed on a valve plate. Therefore, the number of parts can be reduced and the structure can be simplified. Further, when assembling the compressor, it is not necessary to incorporate the on-off valve separately from the valve plate, so that the assembling operation can be simplified. In addition, according to this configuration, it is not necessary to secure an arrangement space for the on-off valve, and the valve control device can be disposed close to the on-off valve on the valve plate. You can also

Further, in the variable displacement swash plate type compressor, since the on-off valve is formed on the valve plate, the on-off valve can be reliably opened and closed without delusion. In the one-side piston type variable displacement swash plate type compressor according to the second aspect, the valve control device is disposed in the rear housing, and the size can be reduced.

According to the third aspect of the present invention, in the one-side piston type variable displacement swash plate type compressor, the valve control device is disposed in the cylinder block, and the size can be further reduced. In the one-side piston type variable displacement swash plate type compressor according to the fourth aspect, the pressure in the discharge chamber can be caused to act on the on-off valve as a force in the closing direction. Therefore, the discharge pressure is not introduced into the crank chamber until the cooling load becomes sufficiently low, and as a result, the large capacity operation is reliably performed until the cooling load becomes low.

In the variable displacement swash plate type compressor according to the fifth aspect, when the valve control device is assembled corresponding to the on-off valve on the valve plate, the opening / closing timing of the on-off valve is set by the setting mechanism of the valve control device. can do. For this reason, even if the opening / closing valve is configured separately from the valve control device and the opening / closing timing cannot be adjusted before the valve control device is incorporated in the compressor, the setting can be easily performed after the incorporation.

In the variable displacement compressor according to the sixth aspect, by assembling the cylinder block and the valve plate,
A communication passage is formed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a one-sided piston type variable displacement swash plate type compressor embodying the present invention will be described below in detail with reference to FIGS.

As shown in FIG. 2, the cylinder block 1 is formed in a substantially short cylindrical shape, and a front housing 2 is joined to a front end face thereof, and a rear housing 4 is provided on a rear end face thereof via a valve plate 3. Are joined. The plurality of tightening bolts 5 are moved from the front housing 2 to the cylinder block 1.
The front housing 2 and the rear housing 4 are fastened and fixed to both end surfaces of the cylinder block 1 by the fastening bolts 5. The drive shaft 6 is rotatably supported at the center of the cylinder block 1 and the front housing 2 via a pair of radial bearings 7 and a shaft sealing device 8, and is operatively connected to a drive source (not shown) such as an engine. Compression spring 9
Represents a rear end face of the drive shaft 6 and a valve plate 3 through a thrust bearing 10.
The compression spring 9 prevents the drive shaft 6 from rattling in the axial direction.

A plurality of cylinder bores 11 are formed through the cylinder block 1 at predetermined intervals so as to extend in parallel with the drive shaft 6, and a piston 12 is accommodated therein so as to be able to reciprocate. The annular partition 4a is formed integrally with the inner surface of the rear housing 4.
As a result, the annular suction chamber 1 is formed on the inner peripheral surface of the rear housing 4.
3 are formed, and a discharge chamber 14 is formed in the center of the inner surface.
Are sectioned. The suction chamber 13 and the discharge chamber 14 are connected to an external cooling circuit (not shown) via a suction opening 15 and a discharge opening 16, respectively.

The valve plate 3 includes an intermediate valve seat plate 17, a suction valve forming plate 18 joined to the surface of the valve seat plate 17 on the cylinder block 1 side, and a valve seat plate 17 on the rear housing 4 side of the valve seat plate 17. And a discharge valve forming plate 19 joined to the surface. Then, the valve seat plate 17, the suction valve forming plate 18 and the discharge valve forming plate 19 are integrally fixed together by tightening and fixing the rear housing 4 to the cylinder block 1. The plurality of suction ports 20 are formed in the valve seat plate 17 and the discharge valve forming plate 19 so that each cylinder bore 11 communicates with the suction chamber 13. A suction valve 21 composed of a plurality of reed valves is formed integrally with the suction valve forming plate 18 so as to open and close each suction port 20. The plurality of discharge ports 22 are formed in the valve seat plate 17 and the suction valve forming plate 18 such that the respective cylinder bores 11 communicate with the discharge chamber 14. The discharge valve 23 composed of a plurality of reed valves is formed integrally with the discharge valve forming plate 19 so as to open and close each discharge port 22. The retainer 24 is fixed to the valve plate 3 by bolts 25 in the discharge chamber 14.
Thus, the opening amount of the discharge valve 23 is limited.

As shown in FIG. 2, the crank chamber 26 is formed inside the front housing 2 and communicates with the suction chamber 13 via a bleed passage 81. The rotor 27 is fixed to the drive shaft 6 so as to be integrally rotatable in the crank chamber 26, and is supported on the inner surface of the front housing 2 via a thrust bearing 28. A pair of support arms 29 (only one is shown) project obliquely from a part of the rotor 27 toward the cylinder block 1 side.
A guide hole 30 extending in a direction intersecting the axis of the guide hole 30 is formed.

The substantially disk-shaped swash plate 31 is inserted into the drive shaft 6 so as to be tiltable, and a spherical connecting body 32 is integrally provided at a part thereof. The spherical connector 32 is slidably engaged with the guide hole 30 of the support arm 29, and the swash plate 31 is connected to the rotor 27 so as to be integrally rotatable. Further, the inclination angle of the swash plate 31 can be changed around the engaging portion between the guide hole 30 and the spherical connector 32. The compression spring 33 is interposed between the rotor 27 and the swash plate 31, and the compression spring 33 urges the swash plate 31 toward the cylinder block 1. The sliding surfaces 34 are formed on both sides of the outer peripheral portion of the swash plate 31, and the sliding surfaces 34 are connected to the base end of each piston 12 via a pair of hemispherical shoes 35. When the drive shaft 6 is rotated, the swash plate 31 is rotated via the rotor 27, and each piston 12 reciprocates in the cylinder bore 11 with a stroke corresponding to the inclination angle of the swash plate 31.

The protrusion 37 is formed on the front surface of the swash plate 31 adjacent to the counter weight 36.
Comes into contact with the inner surface of the rotor 27,
Is set at the maximum inclination angle. The regulating ring 38 is fitted on the outer periphery of the drive shaft 6, and the rear surface of the swash plate 31 abuts on the regulating ring 38, thereby setting the minimum inclination angle of the swash plate 31.

A communication passage 39 is formed in the cylinder block 1, the valve plate 3 and the rear housing 4 between a pair of adjacent cylinder bores 11, and the discharge chamber 14 and the crank chamber 26 communicate with each other through the communication passage 39. Is done. The communication passage 39 includes an opening 40 provided through the valve plate 3, a groove-like passage 41 formed on the rear end surface of the cylinder block 1, and a valve plate 3.
, A passage 43 formed in the front end surface of the annular partition wall 4a of the rear housing 4, and a passage 44 penetrating the valve plate 3 and the cylinder block 1.

An on-off valve 45 formed of a reed valve is formed integrally with the suction valve forming plate 18 of the valve plate 3 so as to open and close the communication port 42 of the communication passage 39. As shown by a chain line in FIG. 1, the pressure in the discharge chamber 14 acts on the on-off valve 45 as a force in the closing direction. In addition, on-off valve 4
5 is elastically deformed into the passage 41 and the communication port 42 is opened, the refrigerant gas in the discharge chamber 14 is introduced into the crank chamber 26 through the communication path 39, and the crank chamber 26
Pressure is increased.

As shown in FIG. 2, the accommodation chamber 46 is formed in a part of the annular partition 4a of the rear housing 4 so as to correspond to the communication port 42 of the communication passage 39. The valve control device 48 is arranged on the annular partition wall 4a corresponding to the on-off valve 45. The valve control device 48 controls the suction chamber 13
The on-off valve 45 is controlled to open and close according to the internal pressure, the pressure in the crank chamber 26 is adjusted, and the inclination angle of the swash plate 31 is changed.

That is, the bellows 49 of the valve control device 48 is housed in the housing chamber 46, and a gas of a predetermined pressure is sealed therein. The conduction path 50 is formed on the peripheral wall of the accommodation chamber 46, and the accommodation chamber 46 outside the bellows 49 and the suction chamber 13 are conducted through the conduction path 50. When the pressure in the suction chamber 13 is higher than a predetermined value, that is, when the cooling load is low, the bellows 49 is contracted. When the pressure in the suction chamber 13 is lower than a predetermined value,
That is, when the cooling load is large, the bellows 49 is extended. The operating rod 51 is interposed between the tip of the bellows 49 and the on-off valve 45. The spring 52 is interposed between the operating rod 51 and the on-off valve 45, and the operating rod 51 is always in contact with the distal end surface of the bellows 49 by the urging force of the compression spring 52. And bellows 4
When the bellows 9 is contracted, the on-off valve 45 is closed by its own elasticity as shown by a solid line in FIG. 1, and when the bellows 49 is extended, as shown by a chain line in FIG. The on-off valve 45 is opened. In addition,
The elastic force of the spring 52 is such that the opening / closing valve 45 is not opened.

The setting mechanism 53 is provided in the valve control device 48, and the opening / closing timing of the opening / closing valve 45 is set by the setting mechanism 53. That is, a female screw 47 is formed on the inner peripheral surface of the opening of the accommodation chamber 46. The adjusting screw member 54 is fixed to the base end of the bellows 49 and is screwed to the female screw 47. An engagement hole 55 for engaging a tool is formed on the rear side surface of the adjusting screw member 54. When the bellows 49 is incorporated into the storage chamber 46, the adjusting screw member 54 is screwed and adjusted to an arbitrary position with respect to the female screw 47 of the storage chamber 46 to adjust the mounting position of the bellows 49. Opening / closing valve 45 by operating rod 51
Opening and closing timing can be set. Cover 56
Is joined to the outer surface of the opening of the accommodation chamber 46 via a seal ring 57, and is fixed by a stop ring 58 so as not to come off. The valve control device 48 is provided in the accommodation chamber 46.
After assembling the above components, the cover 56 is attached, whereby the opening of the storage chamber 46 is closed in an airtight state.

Next, the operation of the single-sided piston type variable displacement swash plate type compressor constructed as described above will be described.
Now, in the compressor of this embodiment, the swash plate 31 is rotated in an inclined state via the rotor 27 by the rotation of the drive shaft 6. As a result, each piston 1 is
2 is reciprocated in the cylinder bore 11. As the piston 12 reciprocates, the refrigerant gas is sucked from the suction chamber 13 into the cylinder bore 11 through the suction port 20, and the refrigerant gas is compressed and discharged through the discharge port 22. Is discharged.

During operation of the compressor, for example, when the temperature in the vehicle compartment is high and the cooling load is large, the pressure in the suction chamber 13 is high, and the bellows 49 of the valve control device 48 In a contracted state. Therefore, the on-off valve 45 is held at a position where the communication port 42 of the communication path 39 is closed. Therefore, the refrigerant gas in the discharge chamber 14 is not introduced into the crank chamber 26 through the communication passage 39, the back pressure acting on the piston 12 is reduced, and the inclination angle of the swash plate 31 is increased. For this reason, the stroke of the piston 12 is extended, the discharge amount of the refrigerant gas is increased, and a large-capacity compression operation is performed.

When the cooling load is small, the suction chamber 1
The pressure of 3 becomes lower. Along with this, the bellows 49 of the valve control device 48 is extended, and the opening / closing valve 45 is elastically deformed via the operating rod 51 to the position where the communication port 42 is opened, as shown by the chain line in FIG. Therefore, the refrigerant gas in the discharge chamber 14 is introduced into the crank chamber 26 through the communication path 39, and the pressure in the crank chamber 26 increases. For this reason, the back pressure acting on the piston 12 increases, the inclination angle of the swash plate 31 decreases, the stroke of the piston 12 decreases, the discharge amount of the refrigerant gas decreases, and the compression capacity decreases.

Although the blow-by gas leaks into the crank chamber 26 during operation of the compressor, the pressure in the crank chamber 26 is constantly extracted to the suction chamber 13 through the bleed passage 81. Incidentally, in the variable displacement swash plate type compressor of this embodiment, the on-off valve 45 for controlling the capacity is constituted by a reed valve integrally formed on the valve plate 3. Therefore, it is not necessary to manufacture the on-off valve 45 separately from the valve plate 3, and the number of components can be reduced and the structure can be simplified. Therefore, it is not necessary to incorporate the on-off valve 45 separately from the valve plate 3 when assembling the compressor, and the assembling work can be simplified.
Moreover, according to this configuration, it is not necessary to secure an arrangement space for the on-off valve 45, and the valve
Because it can be arranged close to the on-off valve 45,
The overall shape of the compressor can be reduced. in addition,
Since the on-off valve 45 is provided integrally with the valve plate 3, the on-off operation position of the on-off valve 45 does not fluctuate due to delusion or the like, and is always constant. Therefore, the opening and closing by the on-off valve 45 is performed reliably, and the closing does not become uncertain.

Further, in the variable displacement compressor of this embodiment, the valve control device 48 can be incorporated by using the partition wall 4a, which contributes to downsizing. Further, in the variable displacement swash plate type compressor of this embodiment, a setting mechanism 53 for setting the opening / closing timing of the on-off valve 45 is provided on the valve control device 48 side. Then, the mounting position of the bellows 49 is adjusted by the adjusting screw member 54 of the setting mechanism 53, and the opening / closing timing of the opening / closing valve 45 is set. For this reason, even if the opening / closing valve 45 is constituted by a reed valve separate from the valve control mechanism 48 and the opening / closing timing cannot be adjusted before the valve control device 48 is incorporated into the compressor, the adjustment is performed after the assembly. It can be done easily and accurately. . Therefore, the on-off valve 45 can be opened and closed at an appropriate timing according to the cooling load, and suitable capacity control can be performed.

In the variable displacement swash plate type compressor of this embodiment, the pressure in the discharge chamber 14 is applied to the on-off valve 45 as a force in the closing direction. For this reason, in order to open the on-off valve 45 at the time of high discharge pressure where the cooling load is large, it is necessary that the cooling load is reduced and the pressure in the suction chamber 13 is sufficiently reduced. Therefore, despite the large cooling load, the opening / closing valve 45 is opened, the discharge pressure is supplied into the crank chamber 26, and the compression capacity is not reduced. It can be performed reliably according to the load.

In addition, in this embodiment, since the groove-shaped passage 41 is formed on the end face of the cylinder block 1, the communication passage 39 is formed by assembling the cylinder block 1 and the valve plate 3. The communication path 39 can be provided by a simple processing without drilling a hole for the communication path 39 in the cylinder block 1.

(Another Embodiment) Next, another embodiment of the present invention will be described with reference to FIGS. First, in the second embodiment shown in FIGS. 4 and 5, the suction chamber 13 is formed inside the annular partition 4a, and the discharge chamber 14 is formed outside the annular partition 4a. The communication port 42 of the communication passage 39 is formed in the valve seat plate 17 of the valve plate 3 and the suction valve forming plate 18. The on-off valve 45 formed of a reed valve is formed integrally with the discharge valve forming plate 19 of the valve plate 3 so as to open and close the communication port 42.

The housing 46 is formed in the cylinder block 1 so as to correspond to the communication port 42 between a pair of adjacent cylinder bores 11. Bellows 4
The valve control device 48 including the actuator 9 and the operating rod 51 is housed in the housing chamber 46, and the setting mechanism 5 is provided similarly to the first embodiment.
The third adjusting screw member 54 is arranged at a predetermined position.

When the pressure in the suction chamber 13 is higher than a predetermined value, the bellows 49 is contracted, and the on-off valve 45 is arranged at a position where the communication port 42 is closed as shown by a solid line in FIG. Thereby, the inclination angle of the swash plate 31 becomes large, and the large-capacity operation is performed. In addition, suction chamber 1
3, the bellows 49 is extended, and as shown by a chain line in FIG.
Is elastically deformed into the discharge chamber 14, and the communication port 42 is opened. As a result, the refrigerant gas in the discharge chamber 14
9, the swash plate 31 is introduced into the crank chamber 26, the inclination angle of the swash plate 31 becomes smaller, and the compression capacity decreases.

Therefore, in the second embodiment, similarly to the first embodiment, the structure can be simplified, the size can be reduced, and the capacity can be controlled well. In addition, in the second embodiment, the valve control device 48 is connected to the cylinder bore 11 in the cylinder block 1.
Since it can be incorporated by utilizing the portion between the two, further miniaturization becomes possible.

Next, in the third embodiment shown in FIG.
A passage 61 in which the communication passage 39 passes through the cylinder block 1
And a passage 62 formed in the rear end face of the cylinder block 1.
And a communication port 42 formed in the valve seat plate 17 and the discharge valve forming plate 19 of the valve plate 3, and a passage 63 formed in the front end surface of the front housing 2. The on-off valve 45 formed of a reed valve is formed integrally with the suction valve forming plate 18 of the valve plate 3 so as to open and close the passage 61. The crank chamber 26 and the suction chamber 13 communicate with each other.
The on-off valve 45 is urged in the opening direction of the passage 61 by its own elastic force.

Further, the accommodation chamber 46 is formed in the annular partition 4a of the rear housing 4, and an annular support seat 64 is formed at the opening edge thereof. Bellows 49 of valve control device 48
Is inserted into the accommodation chamber 46 via the seal ring 65,
A mounting flange 66 that can be seated on the support seat 64 is integrally formed on the outer periphery of the base end. The stop ring 67 is attached to the opening end of the storage chamber 46, and the bellows 49 is prevented from coming off by the stop ring 67.

The shim 68 which constitutes the setting Organization 53 is interposed between the support seat 64 and the support flange 66.
Therefore, by changing the thickness or the number of the shims 68, the mounting position of the bellows 49 in the accommodation chamber 46 can be adjusted, and the opening / closing timing of the opening / closing valve 45 by the operating rod 51 can be set.

The operating rod 51 is attached to the bellows 4 by welding or the like.
9 is fixed to the distal end surface. With this configuration,
In the first and second embodiments, the spring 52 for urging the operating rod 51 toward the bellows 49 becomes unnecessary.

In the third embodiment, when the cooling load is high and the pressure in the suction chamber 13 is high, the bellows 49
Is contracted, and the operating rod 51 is retracted. The on-off valve 45 follows the operating rod 51 and the elastic
Go to one open side, it is held by the rod 51 at an intermediate position between the through passage 61 and the communication port 42. Therefore, the communication passage 39 is opened, and the pressure in the crank chamber 26 is released to the suction chamber 13. Therefore, the crankcase 2
The pressure in 6 becomes low, and large capacity operation is performed. Also,
When the cooling load is low and the pressure in the suction chamber 13 is low,
The bellows 49 is extended, and the on-off valve 45 is
With this, it is arranged at the closed position of the passage 61. Therefore, the communication passage 39 is closed, the pressure in the crank chamber 26 increases, and the operation is performed with a low capacity.

It should be noted that the present invention is not limited to the configuration of each of the above embodiments, but may be arbitrarily modified and embodied as follows without departing from the spirit of the present invention.

(1) As shown by a dashed line in FIG. 1, a conduction path 50 for guiding pressure to the storage chamber 46 is provided between the storage chamber 46 and the discharge chamber 14 to control the capacity by changing the discharge pressure. To be configured to be performed.

(2) A conduction path 50 for guiding pressure to the storage chamber 46 is provided between the storage chamber 46 and the crank chamber 26, and the capacity is controlled by a change in the pressure in the crank chamber 26. To do.

(3) As shown in FIG. 7, the configuration is as follows. That is, as the valve control device 48, the housing chamber 46 is configured as a cylinder, and the bellows 4
Instead of 9, a piston 71 and a spring 72 for urging the piston 71 in one direction are provided in the storage chamber 46. A cap 73 receiving a spring force of a spring 72 is screwed into the opening of the accommodation chamber 46, and the outside thereof has a cover 56, a seal ring 57, and a stop ring 58 similar to those in the first embodiment.
And so on. Further, a conduction path 50 is formed in the annular partition wall 4a between the chamber on the rod side of the storage chamber 46 and the suction chamber 13. Further, the operating rod for opening the opening and closing valve 45 a rod de 74 of the piston 71. In this configuration, the on-off valve 45 is opened the pressure in the suction chamber 13 via the rod de 74 When the lower elastic force of the spring 72.

(4) As the valve control device 48, the suction chamber 1
(3) A diaphragm which is deformed by internal pressure or the like is used, and an on-off valve is opened and closed based on the deformation of the diaphragm.

(5) The present invention is embodied in a variable displacement compressor in which a swash plate is not rotated, that is, a so-called wobble type compressor.

(6) The on-off valve 45 is formed of a plate different from the valve forming plate, and the on-off valve 45 is sandwiched between the cylinder block 1 and the valve plate 3 when the compressor is assembled. Integrate with 3.

In addition to the technical ideas described in the claims, the technical ideas grasped in each of the embodiments described above are listed as follows.

(1) In the one-sided piston type variable displacement swash plate type compressor according to any one of claims 1, 2, 4, and 5, the valve control device 48 is connected to the suction chamber 13 and the discharge chamber 14 of the rear housing 4. A variable capacity swash plate type compressor, wherein the compressor is incorporated in a partition wall 4a for partitioning a swash plate.

According to this structure, the valve control device 48 can be incorporated by using the partition wall 4a, which can contribute to downsizing. (2) In the one-sided piston type variable displacement swash plate type compressor according to any one of claims 1, 3 and 4, the valve control device 48
Is incorporated in the cylinder block 1 between a pair of adjacent cylinder bores 11.

With such a configuration, the valve control device 48 can be incorporated by utilizing the portion between the cylinder bores 11 of the cylinder block 1, which can further contribute to downsizing. (3) In the one-sided piston type variable displacement swash plate type compressor according to claim 5, the valve control device 48 includes a bellows 49 that expands and contracts in accordance with a cooling load, and a tip of the bellows 49 and an on-off valve 45. The setting mechanism 53 includes an adjusting screw member 54 for adjusting the position of the base end of the bellows 49 to the housing 4 or the cylinder block 1 so as to be position-adjustable. One-sided piston type variable displacement swash plate compressor.

With this configuration, when assembling the bellows 49 of the valve control device 48 with the on-off valve 45,
By changing the mounting position of the bellows 49 by the adjusting screw member 54, the opening / closing timing of the opening / closing valve 45 by the operating rod 51 can be easily adjusted.

(4) In the one-sided piston type variable displacement swash plate type compressor according to claim 5, the valve control device 48
Is composed of a bellows 49 that can be expanded and contracted in accordance with the cooling load, and an operating rod 51 interposed between the tip of the bellows 49 and the on-off valve 45. The setting mechanism 53 connects the base end of the bellows 49 to the housing. A single-sided piston type variable displacement swash plate type compressor comprising a shim 68 for adjusting the position of the compressor 4 or the cylinder block 1.

With this configuration, when assembling the bellows 49 of the valve control device 48 corresponding to the on-off valve 45,
The mounting position of the opening and closing valve 45 by the operating rod 51 can be easily adjusted by changing the mounting position of the bellows 49 by the shim 68.

(5) In the valve plate 3 interposed between the cylinder block 1 and the rear housing 4 of the variable displacement swash plate type compressor, a plurality of suction ports 20 and discharges are provided corresponding to the cylinder bores 11 of the cylinder block 1. An intermediate valve seat plate 17 having a port 22 formed therein, a suction valve forming plate 18 joined and disposed on one side of the valve seat plate 17 and having a plurality of suction valves 21 for opening and closing a suction port 20; And a discharge valve forming plate 19 formed with a plurality of discharge valves 23 for opening and closing the discharge port 22. The communication port 42 for capacity control is connected to the valve seat plate 17. And an open / close reed valve 45 for opening / closing the communication port 42 is formed on one of the suction valve formation plate 18 and the discharge valve formation plate 19.

If the valve plate 3 having this configuration is used, it is not necessary to manufacture an on-off valve for capacity control separately from the valve plate, and the number of parts can be reduced and the structure can be simplified.
Assembly can be simplified.

[0065]

Since the present invention is configured as described above, it has the following excellent effects.

In the first aspect, there is no need to manufacture the on-off valve separately from the valve plate, and the number of parts can be reduced and the structure can be simplified. Further, when assembling the compressor, it is not necessary to incorporate the on-off valve separately from the valve plate, so that the assembling operation can be simplified. In addition, since there is no need to secure an arrangement space for the on-off valve and the valve control device can be arranged close to the on-off valve on the valve plate, the overall shape of the compressor can be reduced in size. In addition, since the on-off valve is integral with the valve plate, the on-off valve does not perturb,
Opening and closing can be performed reliably.

In the second aspect, the valve control device is disposed in the rear housing, so that the entire compression tree can be reduced in size. According to the third aspect, the valve control device is disposed in the cylinder block, so that the size can be further reduced.

According to the fourth aspect, the pressure in the discharge chamber can act as a force in the closing direction on the on-off valve. Therefore, the discharge pressure is not introduced into the crank chamber until the cooling load becomes sufficiently low, and as a result, the large capacity operation is reliably performed until the cooling load becomes low,
Capacity control can be suitably performed.

According to the fifth aspect of the present invention, the on-off valve is formed integrally with the valve plate, and the on-off timing can be easily set even if the on-off valve is not provided with an on-off timing setting mechanism. it can.

In the sixth aspect, since the groove is formed in the end face of the cylinder block, a communication passage is formed by assembling the cylinder block and the valve plate, and a hole for the communication passage is formed in the cylinder block. A communication path can be provided by simple processing without drilling.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of a one-sided piston type variable displacement swash plate type compressor embodying the present invention.

FIG. 2 is a cross-sectional view showing the entire configuration of the variable capacity swash plate type compressor.

FIG. 3 is a reduced sectional view taken along line AA of FIG. 1;

FIG. 4 is a partial cross-sectional view showing a second embodiment of a one-sided piston type variable displacement swash plate type compressor embodying the present invention.

FIG. 5 is a reduced sectional view taken along line BB of FIG. 4;

FIG. 6 is a partial sectional view showing a third embodiment of a one-sided piston type variable displacement swash plate type compressor embodying the present invention.

FIG. 7 is a partial cross-sectional view showing another example of a one-side piston type variable displacement swash plate type compressor embodying the present invention.

[Explanation of symbols]

1 ... cylinder block, 2 ... front housing, 3 ...
Valve plate, 4 rear housing, 6 drive shaft, 11 cylinder bore, 12 piston, 13 suction chamber, 14 discharge chamber, 17 valve seat plate, 18 suction valve forming plate, 19 discharge valve forming plate , 20 ... suction port, 21 ... suction valve, 22 ... discharge port, 23 ... discharge valve, 26 ... crank chamber, 27 ... rotor, 31 ... swash plate, 35 ... shoe, 39 ... communication passage, 42 ...
Communication port, 45 ... On-off valve, 48 ... Valve control device, 49 ...
Bellows, 51 ... Working rod, 53 ... Setting mechanism, 54 ...
Adjusting screw member constituting the setting mechanism, 64 ... support seat, 66
... Mounting flange, 68 ... Shim constituting the setting mechanism.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04B 27/14 F04B 27/08 F04B 49/00 361

Claims (6)

(57) [Claims] A cylinder block having a plurality of cylinder bores; a front housing disposed on one side of the cylinder block and having a crank chamber; and an obliquely provided in the crank chamber to be tiltable and connected to a piston in the cylinder bore. A plate, a rear housing disposed on the other side of the cylinder block and having a suction chamber and a discharge chamber, and a suction valve and a cylinder bore disposed between the rear housing and the cylinder block for communicating the cylinder bore with the suction chamber. A valve plate having at least one of a discharge valve for communicating with the discharge chamber, an on-off valve provided in a communication passage connecting one of the discharge chamber and the suction chamber to the crank chamber, and a corresponding one of the on-off valves. A valve control device for controlling the opening and closing of the on-off valve in accordance with the cooling load. In the one-sided piston type variable displacement swash plate type compressor in which the pressure in the chamber is adjusted to change the inclination angle of the swash plate to adjust the compression capacity, the on-off valve is a reed valve formed on a valve plate. A variable displacement swash plate type compressor of a one-sided piston type characterized by comprising: 2. The valve plate includes a valve seat plate and a valve forming plate superposed on the valve seat plate. The on-off valve is formed integrally with the valve forming plate, and the valve control device is connected to the on-off valve. The one-sided piston type variable displacement swash plate type compressor according to claim 1, wherein the variable displacement swash plate type compressor is provided on a rear housing corresponding to the above. 3. The valve plate includes a valve seat plate and a valve forming plate superposed on the valve seat plate, wherein the on-off valve is formed integrally with the valve forming plate, and the valve control device is connected to the on-off valve. 2. The one-sided piston type variable displacement swash plate type compressor according to claim 1, wherein the compressor is provided on the cylinder block in correspondence with the above. 4. The valve according to claim 1, wherein the communication passage is provided between the discharge chamber and the crank chamber, and the on-off valve is disposed at a position where the pressure in the discharge chamber acts as a force in the closing direction on the on-off valve. The one-sided piston type variable displacement swash plate type compressor according to any one of claims 1 to 3. 5. The one-sided piston type variable displacement swash plate type according to claim 1, wherein the valve control device is provided with a setting mechanism for setting an opening / closing timing of the on-off valve. Compressor. 6. The one-sided piston type variable valve according to claim 1, wherein a part of the communication passage is a groove formed in an end face of the cylinder block and a gap defined by the valve plate. Capacity compressor.