Compressor and piston assembly thereof

Abstract

The invention discloses a compressor and a piston assembly thereof. The piston assembly comprises a piston (4) arranged in an air cylinder (10) of the compressor, and further comprises a guide shaft (1) and a ball head joint bearing (2), wherein the guide shaft (1) is fixedly connected with a motor rotor (7) of the compressor and extends into the air cylinder (10); a gas flow channel for allowing gas to pass through is arranged in the guide shaft (1); the outer surface of the guide shaft (1) is provided with a fitting surface (11) which is in sliding fit with the inner wall of the air cylinder (10); one end of the ball head joint bearing (2) is fixedly connected with the piston (4); and the other end of the ball head joint bearing (2) is connected with the guide shaft (1). The piston assembly provided by the invention ensures a gap among the motor rotor, a motor inner stator and a motor outer stator, so that the compressor is stably operated, and therefore, degree of wear of the piston is effectively reduced, and sealing performance of the air cylinder and the piston is ensured.

Description

technical field [0001] The invention relates to the technical field of compression equipment, in particular to a compressor and a piston assembly thereof. Background technique [0002] In practical applications, there are various types of compressors in order to adapt to different needs. [0003] Such as figure 1 and figure 2 As shown, the compressor includes a casing 13 , a cylinder 10 disposed inside it, and a piston 4 disposed within the cylinder 10 to move. The casing 13 is provided with an air inlet 131 and an air outlet 132 . During the operation of the compressor, current is passed through the motor coil, and the motor stator (motor inner stator 8 and motor outer stator 11) forms a closed alternating magnetic circuit, driving the motor mover 7 to move along its axial direction. The motor mover 7 thus drives the piston 4 to reciprocate relative to the cylinder 10, and the gas is sucked into the casing 13 through the air inlet 131. The piston 4 is provided with an ...

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Problems solved by technology

[0004] In actual products, in order to make the compressor run stably, it is necessary to make the outer wall of the piston 4 cooperate with the inner wall of the cylinder 10, so as to control the gap size between the motor stator and the motor rotor 7; however, due to the motor (motor stator) The radial unbalanced electromagnetic force affects the cooperation between the motor stator and the motor mover 7, so that the piston 4 and the cylinder 10 cannot be coaxially arranged, and the axis of the piston 4 and the axis of the cylinder 10 are arranged at an angle a, resulting in abnormal wear of the piston. Decreased sealing performance

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