JPH09287563A - Reciprocating compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sealability, dispense with a gasket, and facilitate assembling operatin of a pressure regulating valve. SOLUTION: A circular projection 28c is formed on a front end surface of a valve case 28 of a pressure regulating valve 24, while a circular groove 50 which is fitted to the circular projection 28c is formed on an inner wall surface 25a of a low pressure space 25 of a valve chamber 23 opposed to the front end surface of the valve case 28. When the pressure regulating valve 24 is inserted into the low pressure space 25 of a cylinder block 1, the projection 28c of the valve case 28 is fitted to the circular groove 50 of the inner wall surface 25a of the cylinder block 1. Airtightness between a crank chamber and a suction chamber 13 is kept, and a gasket is dispensed with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor, and more particularly to a reciprocating compressor having an excellent assembling property.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing a part of a conventional rocking plate type compressor, and FIG. 7 is a plan view of a gasket.

A conventional oscillating plate compressor is formed in the rear head 103, a rear head 103 fixed to an end surface of a cylinder block 101 via a valve plate 102, a crank chamber 108 formed in the cylinder block 101, and a rear head 103. Suction chamber 113, a communication passage 122 that communicates the crank chamber 108 with the suction chamber 113, a valve chamber 123 provided in the communication passage 122, and a valve chamber 123 housed in the valve chamber 123 to prevent a change in pressure of the suction chamber 113. A pressure adjusting valve 124 that opens and closes the communication passage 122 accordingly is provided.

In this oscillating plate compressor, the pressure adjusting valve 12
4, the rear end of the valve case 128 and the valve chamber 123.
A curved circular leaf spring 132 called a curved spring is disposed between the high pressure space 126 and the inner wall surface 126a of the valve chamber 128, and the front end surface of the valve case 128 faces the inner wall surface 126a of the high pressure space 126 of the valve chamber 123. Inner wall surface 125a of the low pressure space 125 of the chamber 123
It is pressed against via the gasket 129. As a result, the airtightness between the crank chamber 108 and the suction chamber 113 is ensured, and the opening / closing operation of the pressure adjusting valve 124 reliably changes the pressure in the crank chamber 108.

As shown in FIG. 7, the gasket 129 is provided with notches 129a at regular intervals in the circumferential direction. Valve chamber 1 in contact with gasket 129
In the inner wall surface 125a of the low pressure space 125 of 23, the communication passage 1
A generally annular high pressure exhaust groove 140 is provided that communicates with 22.

When the pressure in the suction chamber 113 (suction pressure) is below a predetermined value, the low pressure side bellows portion 127 of the pressure regulating valve 124.
When b is expanded and the communication passage 122 is closed and the suction pressure is equal to or higher than a predetermined value, the low pressure side bellows portion 127b of the pressure regulating valve 124.
Contract to open the communication path 122. When the communication passage 122 is opened, the refrigerant gas in the crank chamber 108 is discharged from the valve case 12.
8 enters the valve case 128 through the escape hole 128a, further enters the high pressure discharge groove 140 through the hole 128b of the valve case 128, and flows out into the suction chamber 113 through the passage 122b of the communication passage 122. As a result, the crank chamber 10
The pressure of 8 drops. When the communication passage 122 is closed, the high pressure gas supplied from the discharge chamber (not shown) through the throttle is accumulated in the crank chamber 108 and the crank chamber 108 is closed.
Pressure rises.

The pressure of the crank chamber 108 changes according to the opening / closing operation of the pressure adjusting valve 124, and the inclination of the oscillating plate (not shown) changes according to this change. When the tilt of the oscillating plate changes, the piston stroke amount changes and the discharge capacity changes.

[0008]

By the way, the pressure regulating valve 124 is installed in the low pressure space 12 of the valve chamber 123.
5, the gasket 129 and the pressure adjusting valve 124 are sequentially inserted, the leaf spring 132 is mounted on the rear end of the valve case 128 of the pressure adjusting valve 124, and the rear head 103 is finally covered.

However, it is difficult to insert the gasket 129 into the inner wall surface 125a of the low pressure space 125 of the valve chamber 123. Low pressure space 12 of valve chamber 123
5, when the gasket 129 is inserted, the low pressure space 125
Although the gasket 129 is dropped onto the inner wall surface 125a of the low pressure space 125, the gasket 129 may be caught in an inclined state with respect to the inner wall surface 125a in the middle, so that the gasket 129 may be caught on the inner wall surface 125a with a finger. I have to push it. If the gasket 129 is not inserted correctly, the crank chamber 108 and the suction chamber 113
There is a problem in that the airtightness between the pressure control valve and the pressure control valve cannot be obtained, and the opening / closing operation of the pressure control valve does not reliably change the pressure in the crank chamber. In addition, when assembling, the gasket 129 may be forgotten to be inserted into the low-pressure space 125 of the valve chamber 123, so that the airtightness may not be obtained in some cases.

The present invention has been made in view of the above circumstances, and a problem thereof is that a reciprocating compressor capable of easily assembling a pressure adjusting valve without requiring a gasket while ensuring a sealing property. Is to provide.

[0011]

In order to solve the above problems, a reciprocating compressor according to a first aspect of the present invention comprises a high pressure chamber formed in a cylinder block and a low pressure chamber formed in a side member. A valve chamber provided between the high pressure chamber and the low pressure chamber, and a valve chamber provided in the middle of the communication passage and formed by a low pressure space of the cylinder block and a high pressure space of the side member; In a reciprocating compressor that is housed in a chamber and includes a pressure adjusting valve that opens and closes the communication passage according to a change in pressure of the low pressure chamber, a front end surface of a cylindrical outer case of the pressure adjusting valve, An annular convex portion is provided on one of the low pressure space side inner wall surface of the valve chamber facing the front end surface of the cylindrical outer case, and the front end surface of the cylindrical outer case of the pressure control valve and the low pressure of the valve chamber. Space side The other of the wall, characterized in that the annular groove that mates with the annular convex portion.

When the pressure regulating valve is assembled, the annular convex portion and the annular groove are fitted to each other, so that the airtightness between the high pressure chamber and the low pressure chamber is ensured and the gasket is unnecessary.

A reciprocating compressor according to a second aspect of the present invention is the reciprocating compressor according to the first aspect of the present invention, in which a part of the annular convex portion is a minute cutoff for releasing the fluid in the high pressure chamber to the low pressure side. It is characterized in that a notch is provided.

When the pressure regulating valve is inserted into the low pressure space of the cylinder block, the annular convex portion and the annular concave portion are fitted together, and the high pressure chamber and the low pressure side are always communicated with each other through the minute cutouts of the annular convex portion. Therefore, it is not necessary to provide a hole for preventing surging on the front end surface of the cylindrical outer case.

In the reciprocating compressor according to the third aspect of the present invention, the high pressure chamber formed in the cylinder block, the low pressure chamber formed in the side member, and the high pressure chamber and the low pressure chamber communicate with each other. And a valve chamber provided in the middle of the communication passage, the valve chamber being formed by the low pressure space of the cylinder block and the high pressure space of the side member, and the pressure of the low pressure chamber accommodated in the valve chamber. A pressure regulating valve that opens and closes the communication passage in response to a change; and an annular high-pressure discharge groove provided on an inner wall surface of the valve chamber facing the low-pressure space facing the front end face of the cylindrical outer case of the pressure regulating valve. In the reciprocating compressor, an annular convex portion that is in surface contact with the tapered surface of the high-pressure discharge groove is provided on the front end surface of the cylindrical outer case of the pressure control valve.

Since it is not necessary to provide an annular groove for the purpose of fitting with the annular convex portion in addition to the high pressure discharge groove, the machining of the inner wall surface of the cylinder block is simplified.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a longitudinal sectional view of an oscillating plate compressor according to a first embodiment of the present invention, and FIG. 1 is a diagram for explaining a part of the oscillating plate compressor of FIG. 1 (a) is an enlarged cross-sectional view of the pressure regulating valve, FIG. 1 (b) is a diagram showing a front end face of the pressure regulating valve, and FIG. 1 (c) is a diagram showing an inner wall surface of a low pressure space of the valve chamber.

Cylinder block 1 of this wobble plate compressor
A rear head (side member) 3 is fixed to one end surface of the valve via a valve plate 2, and a front head 4 is fixed to the other end surface thereof.

The cylinder block 1 is provided with a plurality of cylinder bores 6 around the drive shaft 5 at predetermined intervals in the circumferential direction. A piston 7 is slidably accommodated in each of the cylinder bores 6.

A crank chamber (high pressure chamber) 8 is formed in the front head 4, and a swing plate 10 that swings around a hinge ball 9 as the drive shaft 5 rotates in the crank chamber 8. Is housed. The rocking plate 10 is connected to the piston 7 via a connecting rod 11, and the rocking of the rocking plate 10 causes the piston 7 to reciprocate in the cylinder bore 6. The oscillating plate 10 has a larger inclination angle as the pressure in the crank chamber 8 decreases, and conversely becomes smaller as the pressure in the crank chamber 8 increases.

In the rear head 3, a discharge chamber 12 is provided.
A suction chamber (low-pressure chamber) 13 located around the discharge chamber 12
Are formed.

The valve plate 2 has a discharge port 14 for connecting the cylinder bore 6 to the discharge chamber 12, and a suction port 15 for connecting the cylinder bore 6 to the suction chamber 13.
Are provided. The discharge port 14 is opened and closed by a discharge valve 16, and the discharge valve 16 is fixed to a rear head side end surface of the valve plate 2 by a bolt 18 together with a valve retainer 17, and the bolt 18 is screwed into a screw hole 19 of the cylinder block 1. . The suction port 15 is opened and closed by a suction valve 21, and the suction valve 21 is arranged between the valve plate 2 and the cylinder block 1.

As shown in FIG. 1 (a), the cylinder block 1, the valve plate 2, etc. are provided with a communication passage 22 for communicating the suction chamber 13 and the crank chamber 8 with each other. Is provided with a valve chamber 23,
A pressure regulating valve 24 is housed in the valve chamber 23. The communication passage 22 is the passage 2 of the cylinder block 1.
2a and 22b and the hole 2b of the valve plate 2. The valve chamber 23 includes a low-pressure space 25 of the cylinder block 1, a high-pressure space 26 of the rear head 3, and a hole 2 a of the valve plate 2. An O-ring groove 60 is provided on the inner peripheral surface of the hole 2a of the valve plate 2, and an O-ring 61 is attached to the O-ring groove 60. The O-ring 61 ensures airtightness between the low pressure space 25 and the high pressure space 26. Is secured.

As shown in FIG. 1A, the pressure regulating valve 24 comprises a valve body 27 and a valve case (cylindrical outer case) 28 that accommodates the valve body 27. Valve body 27
Is composed of a valve body 27a, a low pressure side bellows portion 27b which expands and contracts according to the suction pressure, and a high pressure side bellows portion 27c which expands and contracts according to the discharge pressure. The inside of the bellows of the low pressure side bellows portion 27b is kept at a vacuum, and the inside of the bellows of the high pressure side bellows portion 27c is kept at a suction pressure.

The valve case 28 is a cylinder and is shown in FIG.
As shown in (b), a relief hole 28a for allowing the valve body 27a to escape is provided at the center of the front end surface of the valve case 28. Relief hole 28 on front end face of valve case 28
A relief hole 28b for preventing surging is provided on the outer side of a.
Is provided, and the annular convex portion 28 is provided outside the escape hole 28b.
c is provided. Outside the annular convex portion 28c, three holes 28d are provided at regular intervals.

When the oscillating plate type compressor is rotated at a high speed under a high load condition, the pressure in the crank chamber 8 rises abruptly, and the tilt angle of the oscillating plate 10 may become unstable. In order to avoid this, a relief hole 28b is provided in the front end surface of the valve case 28 to suppress a rapid increase in the pressure of the crank chamber 8.

The front end surface of the valve case 28 directly abuts the inner wall surface 25a of the low pressure space 25 of the cylinder block 1. As shown in FIG. 1C, a passage 22a forming a part of the communication passage 22 is located in the center of the inner wall surface 25a of the low pressure space 25, and an annular convex portion 28c is provided outside the passage 22a.
Is provided with an annular groove 50, and a substantially annular high-pressure discharge groove 51 is provided outside the annular groove 50 on the inner wall surface 25a. The high-pressure discharge groove 51 communicates with a passage 22 b that forms a part of the communication passage 22.

The rear end of the valve case 28 is opened, and the rear end of the valve case 28 is
Of the high-pressure space 26. The high-pressure space 26 communicates with the high-pressure introduction chamber 40 of the rear head 3,
The high-pressure introduction chamber 40 communicates with the discharge chamber 12 via the communication passage 30.

To assemble the pressure regulating valve 24, first,
The pressure regulating valve 24 is inserted into the low pressure space 25 of the cylinder block 1. When the pressure regulating valve 24 is inserted, the pressure regulating valve 2
The annular convex portion 28c of the No. 4 valve case 28 is fitted into the annular groove 51 of the inner wall surface 25a of the cylinder block 1. next,
The leaf spring 32 is placed on the rear end of the pressure regulating valve 24, and finally the rear head 3 is covered. When the rear head 3 is assembled, the leaf spring 32 is elastically deformed, and the leaf spring 32 is attached to the valve case 28.
The front end face of is urged to the front side.

Next, the operation of the above-mentioned rocking plate compressor will be described.

When the rotational power of the vehicle-mounted engine (not shown) is transmitted to the drive shaft 5, the oscillating plate 1 rotates as the drive shaft 5 rotates.
0 swings, and the swing causes the piston 7 to reciprocate sequentially in the cylinder bores 6 to change the volume in each cylinder bore 6, and the suction, compression and discharge of the refrigerant gas are sequentially performed due to the change in the volume. A high-pressure refrigerant gas having a capacity corresponding to the inclination angle of the moving plate 10 is discharged.

That is, when the heat load is reduced and the pressure regulating valve 24 closes the communication passage 22, the refrigerant gas in the crank chamber 8 does not leak to the suction chamber 13 through the communication passage 22,
Since the high pressure gas supplied from the discharge chamber 12 through the throttle (not shown) is accumulated in the crank chamber 8, the pressure in the crank chamber 8 increases. Due to the elastic force of the leaf spring 32, the annular convex portion 28c of the front end surface of the valve case 28 causes the low pressure space 2
Since it is pressed against the annular groove 50 of the inner wall surface 25a of 5 in a fitted state, the sealing property is secured and the leakage of the refrigerant gas from the crank chamber 8 to the suction chamber 13 is suppressed. As the pressure in the crank chamber 8 increases, the inclination angle of the oscillating plate 10 decreases, which reduces the stroke amount of the piston 7 and reduces the discharge capacity.

The heat load increases, and the pressure regulating valve 24 opens the communication passage 22. When the communication passage 22 is opened, the refrigerant gas in the crank chamber 8 enters the valve case 28 from the passage 22a through the escape hole 28a of the valve case 28, and further enters the high pressure discharge groove 51 from the hole 28d of the valve case 28.
It flows out into the suction chamber 13 through the passage 22b and the hole 2b.
As a result, the pressure in the crank chamber 8 decreases. As the pressure in the crank chamber 8 decreases, the inclination angle of the oscillating plate 10 increases, thereby increasing the stroke amount of the piston 7 and increasing the displacement.

According to the first embodiment, when the pressure regulating valve 24 is inserted into the low pressure space 25 of the cylinder block 1, the annular convex portion 28c of the valve case 28 and the annular groove 51 of the inner wall surface 25a of the cylinder block 1 are formed. Fits, so
Airtightness between the crank chamber 8 and the suction chamber 13 is secured,
No need for gaskets. As a result, the number of parts can be reduced, the cost can be reduced, and the work of correctly setting the gasket on the inner wall surface 25a of the low pressure space 25 of the cylinder block 1 can be omitted, so that the pressure regulating valve 24 can be easily assembled. become.

FIG. 3 is a view for explaining a part of an oscillating plate type compressor according to the second embodiment of the present invention.
3A is an enlarged cross-sectional view of the pressure regulating valve, FIG. 3B is a diagram showing a front end face of the pressure regulating valve, and FIG. 3C is a diagram showing an inner wall surface of a low pressure space of the valve chamber. Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In this second embodiment, the valve case 58
The inner wall surface 2 of the cylinder block 1 is provided with two annular protrusions 58c and 58e centered on the escape hole 58a on the front end face of the cylinder block 1.
5a is provided with two annular grooves 80a and 80b that fit with the annular protrusions 58c and 58e. An escape hole 58b is provided inside the annular protrusion 58e, and three holes 58d are provided outside the annular protrusion 58e.

According to the second embodiment, when the pressure regulating valve 24 is inserted into the low pressure space 25 of the cylinder block 1, the annular projections 58c and 58e of the valve case 58 and the annular groove of the inner wall surface 55a of the cylinder block 1 are inserted. 80a, 80b
Are fitted to each other, and oil is accumulated between the annular protrusions 58c and 58e, so that the airtightness between the crank chamber 8 and the suction chamber 13 is more reliably ensured.

FIG. 4 is a view for explaining a part of an oscillating plate type compressor according to the third embodiment of the present invention.
4A is an enlarged cross-sectional view of the pressure regulating valve, FIG. 4B is a diagram showing a front end face of the pressure regulating valve, and FIG. 4C is a diagram showing an inner wall surface of a low pressure space of the valve chamber. Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the third embodiment, the valve case 68
Annular projection 68c centered on the escape hole 68a on the front end face of the
The inner wall surface 25a of the cylinder block 1 is provided with an annular groove 90 that fits into the annular protrusion 68c, and the notch 70 is provided in the annular protrusion 68c. Three holes 68d are provided outside the annular convex portion 68c.

According to the third embodiment, when the pressure regulating valve 24 is inserted into the low pressure space 25 of the cylinder block 1, the annular convex portion 68c of the valve case 68 and the annular groove 90 of the inner wall surface 65a of the cylinder block 1 are formed. And the notch 70 provided in the annular convex portion 68c is provided, the crank chamber 8 and the valve case 6 can be fitted through the notch 70.
8 will always be in communication. As a result, it is not necessary to form a surging-preventing hole in the front end surface of the valve case 68, it is possible to omit the drilling process, and the processing of the valve case 68 is simplified.

In each of the above-mentioned embodiments, the annular convex portion 28c,
58c, 58e in the valve cases 28, 68, the annular groove 5
0, 80a, 80b, 90 to the inner wall surface 25 of the low pressure space 25
Although the case where they are respectively provided in a is described, conversely to this case, the annular convex portion may be provided in the inner wall surface of the low pressure space, and the annular groove may be provided in the valve case.

FIG. 5 is a view for explaining a part of an oscillating plate type compressor according to a fourth embodiment of the present invention.
5A is an enlarged cross-sectional view of the pressure regulating valve, FIG. 5B is a diagram showing a front end face of the pressure regulating valve, and FIG. 5C is a diagram showing an inner wall surface of a low pressure space of the valve chamber. Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the fourth embodiment, a high pressure discharge groove 91 is provided on the inner wall surface 25a of the cylinder block 1, and the annular groove 91 is formed.
A tapered surface 91a is formed on the inner peripheral surface of the above, and the tapered surface 91a of the annular groove 91 and the inclined surface of the annular convex portion 28c are brought into surface contact with each other.

According to the fourth embodiment, the high pressure discharge groove 9
In addition to 1, it is not necessary to provide a groove only for fitting the annular convex portion 28c, so that the inner wall surface 25 of the cylinder block 1
The processing of a is simplified and the cost can be reduced.

In this embodiment, the case where the present invention is applied to the oscillating plate type compressor is described, but the present invention is not limited to the oscillating plate type compressor, and other types such as a swash plate type compressor can be used. It can also be applied to a reciprocating compressor.

[0047]

As described above, according to the reciprocating compressor of the first aspect of the invention, the airtightness between the high pressure chamber and the low pressure chamber is ensured by the fitting of the annular projection and the annular groove. Since the gasket is not required, the number of parts can be reduced, the cost can be reduced, and the work of correctly setting the gasket on the inner wall surface of the low pressure space of the cylinder block can be omitted. Will be easier.

According to the reciprocating compressor of the second aspect of the present invention, when the annular convex portion and the annular groove are fitted together, the high pressure chamber and the low pressure side communicate with each other through the minute cutouts in the annular convex portion. There is no need to provide a surging prevention hole in the front end surface of the tubular outer case, the boring process can be omitted, and the workability of the tubular outer case is improved.

According to the reciprocating compressor of the third aspect of the present invention, it is not necessary to provide a groove for the purpose of fitting with the annular convex portion in addition to the high pressure discharge groove. Processing can be simplified and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a part of the oscillating plate compressor of FIG.

FIG. 2 is a longitudinal sectional view of the wobble plate compressor according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining a part of an oscillating plate compressor according to a second embodiment of the present invention.

FIG. 4 is a diagram for explaining a part of an oscillating plate compressor according to a third embodiment of the present invention.

FIG. 5 is a diagram for explaining a part of an oscillating plate compressor according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a part of a conventional rocking plate compressor.

FIG. 7 is a plan view of a gasket.

[Explanation of symbols]

 1 Cylinder Block 2 Valve Plate 2a, 2b Valve Plate Hole 3 Rear Head 8 Crank Chamber 12 Discharge Chamber 13 Suction Chamber 22 Communication Passage 22a, 22b Passage 23 Valve Chamber 24 Pressure Control Valve 25 Low Pressure Space 25a Low Pressure Space Inner Wall 26 High Pressure Space 26a Inner wall surface of high-pressure space 28,68 Valve case 28c, 58c, 58e Annular convex part 50,80a, 80b, 90 Annular groove 51,91 High-pressure discharge groove 70 Notch

Claims (3)

[Claims] 1. A high pressure chamber formed in a cylinder block, a low pressure chamber formed in a side member, a communication passage communicating the high pressure chamber and the low pressure chamber, and a passage provided in the middle of the communication passage. And a valve chamber formed by a low-pressure space of the cylinder block and a high-pressure space of the side member, and a pressure control valve that is housed in the valve chamber and that opens and closes the communication passage according to a change in pressure of the low-pressure chamber. In a reciprocating compressor comprising: a front end surface of a cylindrical outer case of the pressure regulating valve, and one of the low pressure space side inner wall surface of the valve chamber facing the front end surface of the cylindrical outer case, An annular protrusion is provided, and an annular groove that fits with the annular protrusion is provided on the other of the front end surface of the cylindrical outer case of the pressure regulating valve and the inner wall surface of the valve chamber on the low pressure space side. Characterized by Reciprocating compressor. 2. The reciprocating compressor according to claim 1, wherein a minute notch that allows the fluid in the high pressure chamber to escape to the low pressure side is provided in a part of the annular convex portion. 3. A high pressure chamber formed in the cylinder block, a low pressure chamber formed in the side member, a communication passage communicating the high pressure chamber with the low pressure chamber, and a communication passage in the middle of the communication passage. A valve chamber that is provided and is formed by a low pressure space of the cylinder block and a high pressure space of the side member, and a pressure that is housed in the valve chamber and that opens and closes the communication passage according to a pressure change of the low pressure chamber. A reciprocating compressor comprising a regulating valve and an annular high pressure discharge groove provided on an inner wall surface of the valve chamber facing the low pressure space, which faces a front end surface of a cylindrical outer case of the pressure regulating valve, A reciprocating compressor, wherein an annular convex portion that is in surface contact with the tapered surface of the high-pressure discharge groove is provided on the front end surface of the cylindrical outer case of the valve.