Valve recess in cylinder block of a compressor

Details Valve recess in cylinder block of a compressor Valve recess in cylinder block of a compressor

2000-03-30

2001-11-20

Walberg, Teresa (Department: 3742)

Pumps

Three or more cylinders arranged in parallel, radial, or...

C137S856000

Reexamination Certificate

active

06318972

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates in general to vehicular air-conditioning systems. In particular, this invention is concerned with a recess for a suction valve in a compressor of a vehicular air conditioning system.
Air-conditioning systems are provided in vehicles for maintaining interior air at desired temperatures. Conventional vehicular systems include a compressor, a condenser, an expansion valve (or orifice tube), and an evaporator. A refrigerant is repeatedly circulated through the cycle of compressor, condenser, expansion valve, and evaporator to maintain interior air at desired temperatures.
A typical refrigerant cycle operates in the following manner. A refrigerant is first compressed by a compressor to a high temperature and high pressure gas and then directed to a condenser. In the condenser, the gas is changed to a lower temperature, high pressure liquid as it is cooled by a heat exchanger operating with the surrounding atmosphere or cooling water. The high pressure liquid loses pressure and becomes chilled when it passes through an expansion valve. When the low pressure liquid passes through an evaporator, it evaporates as it absorbs ambient heat. The evaporated refrigerant, i.e. a gas, flows into the compressor and the process is repeated.
A typical compressor includes a suction chamber and a discharge chamber. A valve is provided at a suction port between the suction chamber and a bore of a cylinder block for a piston in the compressor. The valve, commonly known as a suction valve, is commonly formed by a reed valve.
The suction valve flexes or bends as it opens to permit refrigerant to pass into a bore of the cylinder block. The suction valve is subjected to stresses as it bends and encounters the lip of the bore.
SUMMARY OF THE INVENTION
The present invention includes a compressor of a vehicular air conditioning system. The compressor includes a valve recess in a cylinder block to accommodate the bending of a suction valve. As refrigerant passes into a bore in a cylinder block, a linear wall of the recess reduces the stresses incurred by the suction valve. The reduced stresses improve the life of the suction valve.
In a preferred embodiment, a compressor for a vehicular air conditioning system includes a cylinder block having a bore. A piston is slidingly received in the bore. A cylinder head is mounted on the cylinder block and includes a suction chamber and a discharge chamber. A valve plate is provided between cylinder block and cylinder head. The valve plate includes a suction port and a discharge port. A suction valve cooperates with the suction port to permit refrigerant to enter the bore from the suction chamber. The suction valve includes a terminating portion and a flexing portion. A recess is formed in the cylinder block adjacent the flexing portion of the suction valve. The recess provides a linear clamping line on the suction valve between the valve plate and the cylinder block.
Various objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.


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