JP2000329065A - Reciprocating compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating compressor which suppresses vibration of an intake valve. SOLUTION: An auxiliary flow passage 32 is branched from a portion on the way of an intake hole 11 and opened to an intake chamber 7. Gas in the intake chamber is intaken into cylinder bores 2 through the intake hole and compressed by reciprocation of a piston 3. In such a case, the gas in the intake chamber is supplied to the intake hole also through the auxiliary passage. It is thus possible to prevent occurrence of abrupt pressure lowering of the intake hole at the time of taking in the gas. Preferably, the auxiliary passage is formed between a valve plate and a gasket.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor in which gas in a suction chamber is sucked into a cylinder bore through a suction hole and compressed by reciprocating pistons.

[0002]

2. Description of the Related Art A conventional reciprocating compressor will be described with reference to FIG. The illustrated reciprocating compressor is generally called a variable displacement swash plate compressor. A piston 3 is inserted into each of a plurality of cylinder bores 2 formed in the cylinder block 1 so as to reciprocate up and down. A cylinder head 6 is fixed to one end surface in the axial direction of the cylinder block 1 via a valve plate 4 and a gasket 5 superposed thereon. A chamber 8 is formed. The valve plate 4 partitions the suction chamber 7 and the cylinder bore 2. The valve plate 4 and the gasket 5 are formed with a suction hole 11 and a discharge hole 12 penetrating therethrough. A suction valve 13 faces the suction hole 11. A discharge valve 14 faces the discharge hole 12.

A front housing 16 is fixedly abutted on the opposite surface of the cylinder block 1 in the axial direction.
Is formed. A shaft 18 is provided at the center through the crank chamber 17. The shaft 18 has radial bearings 21 on the cylinder block 1 and the front housing 16.
22 and 23 rotatably supported.

[0004] A rotor 24 is fixed to the shaft 18. The rotor 24 faces the front housing 16 via a thrust bearing 25 in the axial direction. A swash plate 27 is variably attached to the rotor 24 via a hinge mechanism 26. The swash plate 27 includes the shaft 18 and the rotor 2.
4 and rotates together. The piston 3 is axially engaged with the peripheral portion of the swash plate 27 via shoes 28 and 29 sliding on the swash plate 27.

When the shaft 18 is driven to rotate by an external driving source, the rotor 24 and the swash plate 27 rotate.
In accordance with the rotation of the swash plate 27, the piston 3 reciprocates in the axial direction with a stroke corresponding to the inclination angle. Note that the inclination angle of the swash plate 27 changes according to the pressure of the crank chamber 17 controlled by a known mechanism.

Referring also to FIG. 4, when the piston 3 moves in a direction away from the valve plate 4, the gas in the suction chamber 7 pushes and opens the suction valve 13 while passing through the suction hole 11 to the cylinder bore 2.
Inhaled. When the piston 3 rises, the gas compressed in the cylinder bore 2 is discharged to the discharge chamber 8 through the discharge hole 12.

[0007]

However, when the gas is sucked into the cylinder bore 2, the suction valve 13 vibrates to cause noise. This suction valve 13
As one of the causes of the vibration of the gas, the gas near the suction hole 11 indicated by a chain line 31 in FIG.
It is conceivable that the pressure drops sharply, the pressure difference with the gas already sucked into the cylinder bore 2 becomes small, and the behavior of the suction valve 13 becomes unstable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a reciprocating compressor in which a sudden drop in pressure in a suction hole during gas suction is prevented, thereby suppressing the vibration of a suction valve.

[0009]

According to the present invention, there is provided a reciprocating compressor in which gas in a suction chamber is sucked into a cylinder bore through a suction hole and compressed by reciprocation of a piston. A reciprocating compressor is provided, further comprising an auxiliary flow path opened to the suction chamber, wherein the gas in the suction chamber is supplied to the suction hole through the auxiliary flow path.

[0010] A plurality of the auxiliary flow paths may be provided.

A valve plate for partitioning the suction chamber and the cylinder bore; and a gasket superposed on a surface of the valve plate on the suction chamber side, wherein the suction hole is formed through the valve plate and the gasket. The auxiliary flow path, a groove formed between the valve plate and the gasket and connected to the suction hole, and a through hole formed in the gasket and communicating the groove with the suction chamber. May be provided.

[0012] The groove may be formed in the valve plate.

[0013] The groove may be formed in the gasket.

[0014] The groove may be formed by deforming the gasket.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A reciprocating compressor according to a first embodiment of the present invention will be described with reference to FIG. Parts similar to those in the reciprocating compressor of FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted.

The reciprocating compressor has a plurality of auxiliary passages 3 branching from an intermediate portion of the suction hole 11 and opening to the suction chamber 7.
2 to supply the gas in the suction chamber 7 to the suction hole 11 also through the auxiliary flow path 32.

The suction hole 11 is formed through the valve plate 4 and the gasket 5. On the other hand, each auxiliary flow passage 32 is formed in the valve plate 4 between the valve plate 4 and the gasket 5 and has a suction hole 11.
And a groove 33 formed in the gasket 5.
And a through-hole 34 communicating with the suction chamber 7.

When the piston 3 moves away from the valve plate 4, the gas in the suction chamber 7 is sucked into the cylinder bore 2 while pushing the suction valve 13 open. At this time, the gas is supplied to the suction hole 11 also through the auxiliary flow path 32 and is sucked into the cylinder bore 2. That is, not only the gas near the suction hole 11 indicated by a chain line 31 in FIG.
Nearby gas is also drawn into the cylinder bore 2. Therefore, the phenomenon that the pressure is rapidly reduced at the suction hole 11 is prevented, so that the behavior of the suction valve 13 is stabilized and the vibration of the suction valve 13 is suppressed.

Although the groove 33 is formed in the valve plate 4 in FIG. 1, as shown in FIG. 2 showing a reciprocating compressor according to the second embodiment of the present invention, the groove 33 is partially formed on the gasket 5. The groove 33 may be formed in the gasket 5 by subjecting the mold to deformation processing.

The number of auxiliary channels 32 may be arbitrarily changed. The present invention is not limited to the variable displacement type swash plate type compressor, and is effective when applied to various types of reciprocating compressors.

[0021]

As described above, according to the present invention,
It is possible to provide a reciprocating compressor in which the pressure of the suction hole is prevented from suddenly dropping when the gas is sucked, thereby suppressing the vibration of the suction valve.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main part for describing a reciprocating compressor according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a main part for describing a reciprocating compressor according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a swash plate type variable displacement compressor as an example of a conventional reciprocating compressor.

FIG. 4 is a schematic view of a main part of the reciprocating compressor of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 cylinder block 2 cylinder bore 3 piston 4 valve plate 5 gasket 6 cylinder head 7 suction chamber 8 discharge chamber 11 suction chamber 12 discharge hole 13 suction valve 14 discharge valve 18 shaft 24 rotor 26 hinge mechanism 27 swash plate 31 gas near suction hole 32 Auxiliary flow path 33 Groove 34 Through hole 36 Gas near through hole

Claims (6)

[Claims] 1. A reciprocating compressor in which gas in a suction chamber is sucked into a cylinder bore through a suction hole and compressed by a reciprocating movement of a piston. Wherein the gas in the suction chamber is supplied to the suction hole through the auxiliary flow path. 2. The reciprocating compressor according to claim 1, wherein a plurality of auxiliary flow paths are provided. 3. A valve plate for partitioning the suction chamber and the cylinder bore, and a gasket superposed on a surface of the valve plate on the suction chamber side, wherein the suction hole penetrates the valve plate and the gasket. The auxiliary flow path is formed between the valve plate and the gasket and connected to the suction hole; and a through hole formed in the gasket and communicating the groove with the suction chamber. The reciprocating compressor according to claim 1, further comprising a hole. 4. The reciprocating compressor according to claim 3, wherein said groove is formed in said valve plate. 5. The reciprocating compressor according to claim 3, wherein said groove is formed in said gasket. 6. The reciprocating compressor according to claim 5, wherein the groove is formed by deforming the gasket.