JP2009270463A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor wherein a check valve and a relief valve are mounted in a single work. <P>SOLUTION: The compressor includes a compression mechanism 2a; a suction chamber 12a communicating with the compression mechanism 2a and also communicating with a low pressure side of an external refrigerant circuit through a suction port; a discharge chamber 12b communicating with the compression mechanism 2a and also communicating with a high pressure side of the external refrigerant circuit through an discharge port 12c; a check valve 15 for preventing reverse flow of the refrigerant from the external refrigerant circuit to the compressor 1 in non-operational period, and a relief valve 17 preventing an abnormal rise in the internal pressure of the discharge chamber 12b. The check valve 15 is arranged in a discharge path 12d from the discharge chamber 12b to the discharge port 12c. The relief valve 17 is arranged in a relief path 12e formed on the surrounding wall of the discharge path 12d so as to allow the discharge path 12d to communicate with the external environment. The check valve 15 and the relief valve 17 are brought into contact with each other. A locking means 18 locks either one of the two valves into the path where the one valve is arranged, and the locking means 18 forms a means for locking the other valve into the path where the other valve is arranged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a compressor including a check valve and a relief valve.

A compression mechanism, a suction chamber communicating with the compression mechanism and communicating with the low pressure side of the external refrigerant circuit via the suction port, and a discharge chamber communicating with the compression mechanism and communicating with the high pressure side of the external refrigerant circuit via the discharge port Are mounted with a check valve for preventing a reverse flow of the refrigerant from the external refrigerant circuit to the compressor when the compressor is stopped, and a relief valve for preventing an abnormal increase in the pressure in the discharge chamber. In the conventional compressor, as inferred from Patent Documents 1 and 2, the check valve and the relief valve are arranged separately and attached separately.
JP-A-11-315785 Japanese Patent Laid-Open No. 9-60588

The conventional compressor has a problem in that separate check operations are required for the check valve and the relief valve.
The present invention has been made in view of the above problems, and includes a compression mechanism, a suction chamber that communicates with the compression mechanism and communicates with the low pressure side of the external refrigerant circuit via the suction port, and communicates with the compression mechanism and discharge port. A discharge chamber that communicates with the high pressure side of the external refrigerant circuit through the exhaust, a check valve that prevents the refrigerant from flowing back from the external refrigerant circuit to the compressor when the compressor is stopped, and a relief that prevents an abnormal increase in the pressure in the discharge chamber An object of the present invention is to provide a compressor having a valve and a compressor attached with a check valve and a relief valve in one operation.

In order to solve the above problems, in the present invention, a compression mechanism, a suction chamber that communicates with the compression mechanism and communicates with the low-pressure side of the external refrigerant circuit via the suction port, a communication mechanism communicates with the discharge port, and a discharge port. A discharge chamber communicating with the high-pressure side of the external refrigerant circuit, a check valve for preventing the reverse flow of the refrigerant from the external refrigerant circuit to the compressor when the compressor is stopped, and a relief valve for preventing an abnormal increase in the discharge chamber pressure The check valve is disposed in the discharge path from the discharge chamber to the discharge port, and the relief valve is formed in the discharge path surrounding wall and is disposed in the relief path that communicates the discharge path with the external environment. And the relief valve are in contact with each other, and means for locking one of the two valves to the path in which the one valve is disposed locks the other valve in the path in which the other valve is disposed. Provided is a compressor characterized by forming means
In the compressor according to the present invention, the relief valve is provided in the relief path formed in the discharge path surrounding wall and communicating the discharge path and the external environment. Therefore, the relief valve is provided in the check path and the relief path. The released relief valves can be brought into contact with each other. By bringing the check valve and the relief valve into contact with each other, the means for locking the relief valve to the release path can be used as the means for locking the check valve to the discharge path, or the check The means for locking the valve to the discharge path can be used as the means for locking the relief valve to the escape path. As a result, the check valve and the relief valve can be attached to the compressor in one operation.

In a preferred aspect of the present invention, an inlet hole, an outlet hole directed in a direction orthogonal to the inlet hole, a valve body that opens and closes the inlet hole and the outlet hole, and biases the valve body in a valve closing direction. A check valve having a spring, an inlet hole, an outlet hole facing the inlet hole, a valve body for opening and closing the inlet hole, and a relief valve having a spring for biasing the valve body in a valve closing direction, Each valve element is moved in the same direction and the inlet hole of the check valve is directed away from the outlet hole of the check valve. A path from the outer surface of the fixed part to the inlet hole of the relief valve is formed in the fixed part of the valve and the relief valve.
If the check valve and the relief valve are fixed integrally, the check valve and the relief valve can be attached to the compressor in one operation.

In the present invention, an inlet hole, an outlet hole directed in a direction perpendicular to the inlet hole, a valve body that opens and closes the inlet hole and the outlet hole, and a spring that biases the valve body in the valve closing direction are provided. A check valve, an inlet hole, an outlet hole facing the inlet hole, a valve body that opens and closes the inlet hole, and a relief valve that includes a spring that biases the valve body in a valve closing direction. The body movement direction is directed in the same direction and the check valve inlet hole is directed in the direction opposite to the check valve outlet hole. The valve assembly is fixed integrally to form a check valve and release valve. A relief valve integrated check valve is provided in which a passage from the outer surface of the adhesion portion to the inlet hole of the relief valve is formed in the adhesion portion with the valve.
If the check valve integrated check valve according to the present invention is used, the check valve and the release valve can be attached to the compressor in one operation.

According to the present invention, the compression mechanism, the suction chamber communicating with the compression mechanism and communicating with the low pressure side of the external refrigerant circuit via the suction port, and the high pressure side of the external refrigerant circuit communicating with the compression mechanism and via the discharge port are provided. A compression mechanism comprising a communicating discharge chamber, a check valve for preventing a reverse flow of refrigerant from the external refrigerant circuit to the compressor when the compressor is stopped, and a relief valve for preventing an abnormal increase in pressure in the discharge chamber, A compressor with a check valve and a relief valve attached in one operation is provided.

A variable capacity swash plate compressor according to an embodiment of the present invention will be described.
As shown in FIG. 1, the variable capacity swash plate compressor 1 includes a cylindrical cylinder block 2 having a cylinder bore 2 a and a crank chamber in cooperation with the cylinder block 2 facing one end surface of the cylinder block 2. 3 is formed in the crank chamber 3 and is rotatably supported by the cylinder block 2 and the front housing 4, and one end penetrates the front housing 4 to form the crank chamber 3. A rotating shaft 5 extending outward, a rotor 6 disposed in the crank chamber 3 and fixed to the rotating shaft 5, and disposed in the crank chamber 3 and connected to the rotor 6 via a link member 7 and having a variable tilt angle. A swash plate 8 engaged with the rotary shaft 5 and driven to rotate by the rotary shaft 5; a pair of shoes 9 disposed in the crank chamber 3 and slidably engaged with the outer peripheral portion of the swash plate 8; A piston 10 inserted into the bore 2a and slidably engaged with the outer peripheral portion of the swash plate 8 through the shoe 9 and reciprocates as the swash plate 8 rotates, and a suction hole 11a communicating with the cylinder bore 2a And a discharge valve 11b and a disc-shaped valve plate 11 facing the other end surface of the cylinder block 2, and a suction chamber 12a is formed in the central portion in the radial direction. The suction chamber 12a is surrounded by a radially outer portion. A discharge chamber 12b is formed in the bottom plate, and is mounted on a bottom-cylindrical rear housing 12 facing the other end surface of the cylinder block 2 with the valve plate 11 in between, and an end surface of the valve plate 11 facing the cylinder block 2. A suction valve that opens and closes the suction hole 11a, a discharge valve that is attached to an end face of the valve plate 11 facing the rear housing 12 and opens and closes the discharge hole 11b, and is inserted into the front housing 4 and further passes through the crank chamber 3. It is inserted into the cylinder block 2 and the valve plate 11, and a plurality of through bolts 13 to assemble them as a unitary body by screwing the rear housing 12.

A plurality of cylinder bores 2a, a piston 10, a suction hole 11a, a discharge hole 11b, a suction valve, a discharge valve, and a plurality of pairs of shoes 9 are arranged at intervals in the circumferential direction.
The cylinder bore 2a, the piston 10, the suction valve, and the discharge valve form a compression mechanism, and the rotary shaft 5, the rotor 6, the link member 7, the swash plate 8, and the shoe 9 form a compression mechanism driving device.
The suction chamber 12a communicates with the cylinder bore 2a through a suction hole 11a and a suction valve, and also communicates with a low pressure side of an external refrigerant circuit (not shown) through a suction port (not shown). The discharge chamber 12b has a discharge valve and a discharge hole 11b. And communicates with the high pressure side of an external refrigerant circuit (not shown) through a discharge port 12 c formed in the cylinder head 12.
One end of the rotating shaft 5 extending outside the crank chamber 3 is directly connected to an external drive source (not shown) via a power transmission mechanism 14.

As shown in FIGS. 1 and 2, a discharge path 12 d extending from the discharge chamber 12 b to the discharge port 12 c is formed in the cylinder head 12. An escape path 12e that allows the discharge path 12d to communicate with the external environment is formed in the flesh of the cylinder head 12 that forms the surrounding wall of the discharge path 12d.
As shown in FIGS. 2 and 3, an inlet hole 15a ₁ is formed in _one end wall, an outlet hole 15a ₂ directed in a direction perpendicular to the inlet hole is formed in the peripheral wall, and a cross shape is formed in the other end wall. of the slit 15a ₃ is cylindrical formed casing 15a, a longitudinally slidable a bottomed cylindrical valve body 15b of the casing 15a in the housing 15a, an inlet hole 15a ₁ and the outlet holes 15a ₂ A check valve 15 having a spring 15c for urging the valve body 15b in the closing direction is inserted into the discharge path 12d via the escape path 12e from the external environment side, and an annular step portion 12d formed in the discharge path 12d. ₁ is disposed in the discharge path 12d with the one end wall fitted therein. The fitting portion is sealed by an O-ring 16.
As shown in FIGS. 2 and 3, and one of the end walls and the groove 17a ₂ of the inlet holes 17a ₁ and the cross-shaped is formed, the other end wall cylindrical outlet hole 17a ₃ is formed casing 17a, and slidable cylindrical valve body 17b in the longitudinal direction of the casing in the casing 17a, relief valve 17 and a spring 17c which urges the valve body 17b in the direction of closing the inlet hole 17a ₁ is, the external environment side Is inserted into the escape passage 12e, the one end wall is brought into contact with the other end wall of the check valve 15, and the other end wall is elastically engaged with a circumferential groove formed near the outlet of the escape passage 12e. In the state of being brought into contact with the retaining ring 18, the escape path 12e is disposed. The longitudinal direction of the casing 17a coincides with the longitudinal direction of the casing 15a. The cross-shaped groove 17a ₂ faces the cross-shaped slit 15a ₃ . A portion of the peripheral wall of the casing 17a adjacent to the other end wall bulges in the radial direction and contacts the peripheral wall of the escape path 12e. The contact portion is sealed by an O-ring 19. The outer peripheral surface of the valve body 17b, a plurality of longitudinal grooves 17b ₁ at spaced intervals to each other in the circumferential direction are formed.
The check valve 15 and the relief valve 17 in contact with each other, while being held between the retaining ring 18 elastically engaged in the circumferential groove of the annular stepped portion 12d ₁ and missed path 12e of the discharge passage, disposed respectively It is locked to the route.
The cruciform groove 17a ₂ and the cruciform slit 15a ₃ that directly face each other cooperate in a path from the outer surface of the contact portion between the check valve 15 and the relief valve 17 to the inlet hole 17a ₁ of the relief valve 17. 19 is formed.

In the variable capacity swash plate compressor 1, the rotary shaft 5 is rotationally driven by an external drive source, the swash plate 8 rotates as the rotary shaft 5 rotates, and the piston 10 reciprocates. As the piston 10 reciprocates, the refrigerant gas returned from the low pressure side of the external refrigerant circuit flows into the cylinder bore 2a through the suction port, the suction chamber 12a, the suction hole 11a, and the suction valve, and is compressed in the cylinder bore 2a. Then, the liquid is discharged into the discharge chamber 12b through the discharge hole 11b and the discharge valve. Pressure refrigerant gas valve body 15b of the check valve 15 is moved against the biasing force of the spring 15c, thereby opening the inlet holes 15a ₁ and the outlet holes 15a _2. The refrigerant gas flows out to the high pressure side of the external refrigerant circuit through the discharge path 12d, the check valve 15 and the discharge port 12c.

When the variable displacement swash plate type compressor 1 is stopped over a long period of time, decrease the inner pressure in the discharge chamber 12b is, the valve element 15b under the biasing force of the spring 15c is closed and the inlet holes 15a ₁ and the outlet holes 15a ₂ Then, the check valve 15 is closed. As a result, the reverse flow of the refrigerant from the high pressure side of the external refrigerant circuit to the variable capacity swash plate compressor 1 is prevented.
When the internal pressure of the discharge chamber 12b is increased beyond a predetermined value, high-pressure refrigerant gas than the check valve 15 is guided to the inlet hole 17a ₁ downstream of the discharge passage 12d via the path 19 from the relief valve 17 is a valve the body 17b is moved against the biasing force of the spring 17c, thereby opening the inlet holes 17a _1. The inlet holes 17a ₁ of the refrigerant gas relief valve 17, the longitudinal direction Mizomizo 17b ₁ formed on the outer peripheral surface of the valve body 17b, is released to the outside environment through the outlet holes 17a _3. As a result, occurrence of a situation in which the internal pressure of the discharge chamber 12b abnormally increases is prevented.

The check valve 15 and the relief valve 17 are attached by first inserting the check valve 15 from the external environment side into the discharge path 12d via the relief path 12e, and fitting _one end wall of the check valve into the annular step 12d1. Then, the relief valve 17 is inserted into the relief path 12e from the external environment side so that one end wall is brought into contact with the other end wall of the check valve 15, and then the retaining ring 18 is elastically formed in the peripheral groove of the relief path 12e. This is done by engaging and contacting the other end wall of the relief valve 17.
In the variable capacity swash plate compressor 1, since the relief valve 17 is disposed in the relief path 12e that is formed in the flesh portion of the cylinder head 12 that forms the surrounding wall of the discharge path 12d and communicates the discharge path 12d and the external environment. The check valve 15 arranged in the discharge path 12d and the relief valve 17 arranged in the relief path 12e can be brought into contact with each other. By making the check valve 15 and the relief valve 17 contact each other, a retaining ring 18 that is a means for locking the relief valve 17 to the relief path 12e and a means for locking the check valve 15 to the discharge path 12d. It becomes possible to use as. As a result, the check valve 15 and the relief valve 17 can be attached to the compressor in one operation.

The valve assembly may be formed by fixing the abutment portion between the check valve 15 and the relief valve 17 and integrating them. In this case, a passage 19 is formed by drilling a through hole in the radial direction in the check valve integrated check valve, which is a valve assembly.

The relief valve 17 may be screwed into the relief path 12e. In this case, the screwed portion of the relief valve 17 is used as a locking means for the check valve 15.
Missed similar annular step and the annular step 12d ₁ is formed on the external environment end of the path 12e, and expanded the discharge chamber-side end portion of the discharge passage 12d to remove the annular step 12d _1, those the enlarged A circumferential groove is formed in the diameter portion, and from the discharge chamber 12b side, the relief valve 17 is first inserted into the escape passage 12e through the discharge passage 12d and engaged with the annular step at the end portion on the external environment side, and then the discharge chamber 12b. The check valve 15 is inserted into the discharge passage 12d from the side and brought into contact with the relief valve 17, and a stop ring similar to the stop ring 18 is elastically engaged with the circumferential groove of the enlarged diameter portion so as to contact the check valve 15. The check valve 15 and the relief valve 17 may be locked in a path in which the check valve 15 and the relief valve 17 are disposed. In this case, a retaining ring which is a means for locking the check valve 15 to the discharge path 12d forms a means for locking the relief valve 17 to the release path 12e. In this case, the check valve 15 may be screwed to the discharge path 12d.
The discharge port 12c may be formed in the cylinder block 2. In this case, the discharge path 12d extends over the cylinder head 12 and the cylinder block 2, and the escape path 12e is formed in the cylinder head 12 or the cylinder block 2.

The present invention is not limited to a swash plate compressor, and includes a compression mechanism, such as a swing plate compressor, a scroll compressor, a vane compressor, etc., and a low pressure side of an external refrigerant circuit that communicates with the compression mechanism and via a suction port. Can be widely used in various compressors including a suction chamber that communicates with the compressor and a discharge chamber that communicates with the compression mechanism and communicates with the high-pressure side of the external refrigerant circuit via the discharge port.

It is sectional drawing of the variable capacity | capacitance swash plate type compressor which concerns on the Example of this invention. It is sectional drawing of a non-return valve and a relief valve with which the variable capacity | capacitance swash plate type compressor which concerns on the Example of this invention is provided. 1 is an external perspective view of a check valve and a relief valve included in a variable capacity swash plate compressor according to an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Variable capacity swash plate type compressor 2 Cylinder block 2a Cylinder bore 3 Crank chamber 4 Front housing 5 Rotating shaft 8 Swash plate 10 Piston 11 Valve plate 11a Suction hole 11b Discharge hole 12 Cylinder head 12a Suction chamber 12b Discharge chamber 12c Discharge port 12d Discharge path 12d ₁ annular step 12e relief path 15 check valve 17 relief valve 18 retaining ring

Claims (3)

A compression mechanism, a suction chamber communicating with the compression mechanism and communicating with the low pressure side of the external refrigerant circuit via the suction port, and a discharge chamber communicating with the compression mechanism and communicating with the high pressure side of the external refrigerant circuit via the discharge port And a check valve for preventing the reverse flow of the refrigerant from the external refrigerant circuit to the compressor when the compressor is stopped, and a relief valve for preventing an abnormal increase in the discharge chamber pressure. The check valve is connected to the discharge port from the discharge chamber. The relief valve is formed in the discharge passage enclosing wall and is provided in the relief path that communicates the discharge route with the external environment. The check valve and the relief valve are in contact with each other, and the two Compression means characterized in that the means for locking one of the valves in the path in which the one valve is disposed forms the means for locking the other valve in the path in which the other valve is disposed. Machine. A check valve having an inlet hole, an outlet hole directed in a direction orthogonal to the inlet hole, a valve body that opens and closes the inlet hole and the outlet hole, and a spring that biases the valve body in a valve closing direction; And a relief valve having an inlet hole, an outlet hole facing the inlet hole, a valve body that opens and closes the inlet hole, and a spring that biases the valve body in a valve closing direction, the movement direction of each valve body The valve assembly is formed as a single unit with the check valve inlet hole facing away from the check valve inlet hole and the check valve outlet hole facing away from the relief valve outlet hole. The compressor according to claim 1, wherein a path from the outer surface of the fixing portion to the inlet hole of the relief valve is formed. A check valve having an inlet hole, an outlet hole directed in a direction orthogonal to the inlet hole, a valve body that opens and closes the inlet hole and the outlet hole, and a spring that biases the valve body in a valve closing direction; And a relief valve having an inlet hole, an outlet hole facing the inlet hole, a valve body that opens and closes the inlet hole, and a spring that biases the valve body in a valve closing direction, the movement direction of each valve body The valve assembly is formed as a single unit with the check valve inlet hole facing away from the check valve inlet hole and the check valve outlet hole facing away from the relief valve outlet hole. And a relief valve integrated check valve characterized in that a path from the outer surface of the adhering portion to the inlet hole of the relief valve is formed.

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