An oil-free linear compressor for a heat pump system

Abstract

The invention discloses an oil-free linear compressor for a heat pump system, comprising: a cylinder, a cylinder frame, a linear motor assembly, a suction valve plate, an exhaust valve assembly and a casing; the flanges of the two cylinder frames are symmetrical Installed at both ends of the cylinder; two identical linear motor assemblies are respectively installed outside the center tubes of the two cylinder frames; the outer edges of the two suction valve plates are respectively fixed on the opposite ends of the two pistons; The exhaust valve assembly is installed in the exhaust cavity; the two housings are respectively installed on the outside of the two linear motor assemblies, and the open end of the housing is fixed on the outer edge of the flange of the cylinder frame; Two oppositely arranged linear motor components drive the piston to reciprocate, which improves the compression efficiency of the compressor; and the opposite movement of the two pistons can offset most of the vibration, and the vibration of the whole machine is smaller; the use of oil-free operation can avoid The limitations of system performance, reliability and usage scenarios caused by lubricating oil greatly increase its scope of use.

Description

technical field [0001] The invention belongs to the technical field of compressors, and in particular relates to an oil-free linear compressor for a heat pump system. Background technique [0002] Traditional reciprocating refrigeration compressors usually use a rotating motor to drive the piston to complete the process of compression and exhaust to achieve the cooling effect. When converting the rotating motion to reciprocating motion, due to the existence of mechanical structures such as crank connecting rods, the friction loss of the crank connecting rod structure is relatively large. large, low mechanical efficiency; the moment of inertia is difficult to balance, and the vibration of the whole machine is large; in order to ensure the reliability of the friction pair, refrigeration oil lubrication is required, and the lubricating oil entering the throttling device (especially the micro-channel) will lead to a decrease or even loss of refrigeration capacity, which will affe...

AI Technical Summary

Problems solved by technology

[0005] 1. Loss of high-pressure side gas reduces system efficiency;

[0006] 2. Single-sided leaf springs are used, which cannot provide radial support. There is still friction between the piston and the cylinder when the compressor is started, and tiny debris in the compressor or long-term starting friction products are likely to block the throttling device and cause the gas bearing to fail. ;

[0007] 3. In order to play the role of gas bearing clearance support, the mating surface of piston and cylinder is often designed to be long, which is not conducive to the small size and light weight of the whole machine

[0009] 1. The one-sided leaf spring support is difficult to offset the movement deflection caused by the gravity of the movable part, and mainly plays the role of providing axial stiffness, and there is still a large risk of wear in long-term operation

[0010] 2. Materials with self-lubricating properties will still produce frictional foreign matter during operation. The whole system must be equipped with a filter, which increases the complexity of the system and reduces the reliability of use

[0011] 3. Due to the installation of air-suction moving sub-components and non-suction moving sub-components, the suction pulsation will increase the difficulty of controlling the vibration of the whole machine

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