Linear compressor and position detection method

Abstract

The invention provides a linear compressor and a position detection method. The linear compressor comprises a shell, a piston and an air cylinder, wherein the piston and the air cylinder are arranged in the shell. The piston is arranged in the air cylinder in a sliding manner. An exhaust valve and an air cylinder cover are arranged on the air cylinder. The linear compressor further comprises a position detection assembly. The position detection assembly comprises a detection magnetic body and detection coils. The detection magnetic body is fixed to the exhaust valve. The detection coils are arranged on the air cylinder cover. The detection magnetic body and the detection coils are arranged oppositely. In the reciprocating motion process of the piston, the distances of the piston close to the exhaust valve are different, impacting force of different degrees is generated to the exhaust valve, and therefore the opening degrees of the exhaust valve are different; the distance between the detection magnetic body and the detection coils is changed, and therefore induced electromotive force values generated by the detection coils are different; and according to the induced electromotive force values generated by the detection coils, displacement of the piston can be calculated, position detection accuracy of the linear compressor is improved, and use reliability is improved.

Description

technical field [0001] The invention relates to a compressor, in particular to a linear compressor and a position detection method. Background technique [0002] At present, there are two types of compressors used in refrigeration equipment, rotary and linear. The linear compressors in the prior art usually include casings, stators, movers, coils, pistons, and cylinders. The movers drive the pistons to move back and forth. Realize cylinder exhaust. However, during the movement of the piston, in order to prevent the piston from exceeding the stroke and colliding with the head of the cylinder, a position sensor is usually arranged in the compressor, for example: Chinese Patent No. 01806978.9 discloses a position sensor and a compressor, which discloses A probe electrically connected to the control circuit is used to detect the position of the mover or piston. However, since the probe is used for detection, during the movement of the piston, the probe is easily broken or broke...

AI Technical Summary

Problems solved by technology

However, during the movement of the piston, in order to prevent the piston from exceeding the stroke and colliding with the head of the cylinder, a position sensor is usually arranged in the compressor, for example: Chinese Patent No. 01806978.9 discloses a position sensor and a compressor, which discloses A probe electrically connected to the control circuit is used to detect the position of the mover or piston. However, since the probe is used for detection, during the movement of the piston, the probe is easily broken or broken due to collisions and other reasons. After the probe is deformed will affect the accuracy of its detection

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