Discharge valve mechanism in compressor

Abstract

A discharge valve mechanism in a compressor for compressing refrigerant gas includes a valve plate and a discharge valve plate. The valve plate forms a discharge port into which the compressed refrigerant gas is discharged. The discharge valve plate is located between the valve plate and a rear housing and includes a support portion, a connecting portion and a discharge valve. The support portion is sandwiched between the valve plate and the end surface of the rear housing. The connecting portion is bendably cantilevered from the support portion. The connecting portion extends to an opposite side of the discharge port so as to bypass the discharge port from the support portion. The connecting portion has a free end portion. The discharge valve extends from the free end portion to the discharge port toward the support portion for opening and closing the discharge port.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a discharge valve mechanism in a compressor that is used for an air-conditioner. [0002] Japanese Unexamined Patent Publication 10-141230 discloses a discharge valve mechanism in a compressor. Referring to FIG. 8, a gasket 106, a valve plate 109, a suction valve plate 111, a discharge valve plate 113 and a gasket 115 are interposed between a cylinder block 102 having formed therein a compression chamber 101 and a rear housing 105 having formed therein a suction chamber 103 and a discharge chamber 104 in the compressor. The valve plate 109 has formed therein a suction port 107 and a discharge port 108, and the suction valve plate 111 has formed therein a suction valve 110 for opening and closing the suction port 107. Also, the discharge valve plate 113 has formed therein a discharge valve 112 for opening and closing the discharge port 108, and the gasket 115 has formed therein a retainer 114. A piston (not shown) reci...

AI Technical Summary

Benefits of technology

[0007] The present invention provides a discharge valve mechanism in a compressor in which the effective length from a support portion to a discharge port, that is, a sum of the lengths of a connecting portion and a discharge valve is enlarged, thereby the opening limit of the discharge valve is enlarged and the discharge valve smoothly moves to open and close the discharge port, so that the discharge resistance of refrigerant gas is reduced, compression efficiency of the compressor is improved and excessive compression in a compression chamber is reduced.

Problems solved by technology

However, when the opening limit of the discharge valves is restricted by the retainer, this restriction causes discharge resistance.

Thus, there is a fear that compression efficiency of the compressor is decreased and excessive compression in the compression chamber is increased.

The increase in the excessive compression in the compression chamber causes vibration of the compressor to increase, which leads to the problem of abnormal noise.

In addition, load on compressor parts is increased due to increase in compressing force of the compressor.

Thereby, the life of the whole compressor deteriorates, and expensive parts such as high strength element and high hardwearing element need to be utilized to maintain the life of the compressor.

However, when the opening limit of the discharge valve is merely enlarged, the discharge valve is broken by bend, or the discharge valve enters its plastic region so that the discharge valve fails to close the discharge port in a suction process.

However, when a conventional discharge valve mechanism is utilized in the compressor whose body size generally has design limitation, the distance from the support portion, which cantilevers the discharge valve, to the discharge port is short to obtain the sufficient effective length of the discharge valve.

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