Control valves for variable displacement compressors

Abstract

The invention aims to provide a control valve for a variable displacement compressor. Even if the positions of an air suction cavity, a crankshaft cavity and an exhaust cavity of the compressor are staggered from corresponding chambers in the control valve, connection of the cavities and the chambers is not affected. In order to achieve the purpose, the control valve for the variable displacement compressor is suitable for being arranged in an air passage between the exhaust cavity and the crankshaft cavity of the compressor, and comprises an inner shell and a valve spool, a plurality of chambers are formed in the inner shell and correspondingly connected with pressure cavities of the compressor respectively through channels, the valve spool is movably arranged in one valve chamber of the chambers to change the opening of a valve hole of the valve chamber, and the valve hole is a portion of the air passage. The control valve is characterized by further comprising an outer shell sleeved on the outer side of the inner shell, and a gap is reserved between the outer shell and the inner shell and serves as a connecting channel for connecting two chambers or connecting the chambers with the corresponding pressure cavities.

Description

technical field [0001] The invention relates to a control valve for a variable displacement compressor. Background technique [0002] The existing variable displacement compressor control valve includes a solenoid that can be energized, a pressure-sensitive part that can sense the pressure of the suction chamber or the crank chamber, and the solenoid and the pressure-sensitive part act on the valve core together to change the valve core. The opening of the hole controls the pressure in the crank chamber. The casing of the control valve is provided with an introduction channel connected with the suction chamber, the crank chamber and the discharge chamber of the compressor, so that the corresponding chambers in the control valve are kept consistent with the pressures of the three chambers. [0003] As shown in Figure 1, in the variable capacity compressor, the main shaft 46 is driven by the engine to drive the hinge mechanism 49 and the swash plate 48 in the crank chamber 45...

AI Technical Summary

Problems solved by technology

[0006] In many cases, due to the staggering between the positions of the suction chamber, crank chamber and exhaust chamber of the compressor and the corresponding chambers in the control valve, it is difficult to connect the suction chamber, crank chamber and exhaust chamber with the corresponding introduction passages. docking

However, the space for installing the control valve is limited, and the thickness of the control valve shell is only about 2mm, which is difficult to process.

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