Plunger for compressor pump body, production method thereof as well as compressor and refrigeration equipment

Abstract

The invention discloses a plunger for a compressor pump body, a production method thereof as well as a compressor and refrigeration equipment. The plunger for the compressor pump body is made from vermicular graphite cast iron, wherein the vermicular graphite cast iron contains the following components in percentage by weight: 3.2%-3.8% of C, 2.0%-3.0% of Si, 0.5%-1% of Mn, not higher than 1.0% of Cu, not higher than 0.3% of P, not higher than 0.06% of S and the balance of iron.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a piston for a pump body of a compressor, a preparation method thereof, a compressor and refrigeration equipment. Background technique [0002] International and domestic major air-conditioning manufacturers generally use fully enclosed rolling piston rotary air-conditioning compressors. The pump body of the compressor includes cylinders, upper and lower bearings, pistons, sliding vanes and crankshafts, and the cylinder, upper and lower bearings, pistons and sliding vanes form a cavity for compressing refrigerant mixed gas. Due to the gap leakage of the pump body parts, suction and exhaust pressure loss and friction loss will have a great impact on the efficiency of the compressor, excessive wear between the parts will cause the performance of the compressor to decline significantly or even fail, and the above factors are related to the pump There is a great relationship between the m...

AI Technical Summary

Problems solved by technology

If the clearance design of each matching size is large, it will cause a large loss of volumetric efficiency of the whole machine, and if the clearance design is small, it will cause changes in the actual clearance during operation, resulting in compressor failure

[0006] Insufficient wear resistance: There is rolling friction and sliding friction between the piston and other parts of the compressor pump body, which is one of the parts with the worst friction conditions among the parts of the compressor pump body. Wear-resistant material, but after long-term heavy-duty operation, it is often still the most severely worn part due to the splitting effect on the matrix in the form of flake graphite

[0007] High cost: With the increase of gray cast iron grades, the casting cost is significantly increased. At the same time, due to the addition of alloying elements to the matrix, especially Ni and Mo are precious metals, the cost of the piston is further increased

[0008] Therefore, the alloy gray cast iron piston used in the pump body of the compressor at the present stage still needs to be improved, regardless of the material characteristics to meet the requirements of the compressor, or the cost of raw materials and manufacturing.

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