Piston for rotary compressor and manufacturing method of piston

A technology of a rotary compressor and a manufacturing method, which is applied in the direction of rotary piston/oscillating piston pump components, manufacturing tools, mechanical equipment, etc., and can solve problems such as high cost and large pollution

Inactive Publication Date: 2012-01-11
浙江百达精工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For a long time, alloy cast iron containing Ni, Cr, and Mo is usually used as the material of the piston. Since the utilization rate of the casting material is only 50-60%, and the cost is high and the pollution is large, it is necessary to develop a piston material with high material utilization rate and low energy consumption. become an urgent need

Method used

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  • Piston for rotary compressor and manufacturing method of piston
  • Piston for rotary compressor and manufacturing method of piston
  • Piston for rotary compressor and manufacturing method of piston

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The piston is made of 20CrMnTi material, which is cold-extruded to form a piston base blank. After rough machining, it is subjected to heat stabilization treatment at 580°C for three times in an unprotected air furnace. After finishing, it is gas nitrided at a temperature of 550°C for 8 Hours, the gas is ammonia and carbon dioxide. After finishing, it reaches the use precision, forms a 30 um diffusion layer, and the surface hardness HV is greater than 450, which fully meets the use requirements.

Embodiment 2

[0020] The piston is made of 42CrMo material, and the piston base blank is formed by warm extrusion. After rough machining, heat stabilization treatment at 650°C is performed twice in a vacuum furnace, and ion nitriding is carried out after finishing machining. The temperature is 560°C and the time is 10 hours. , the gas introduced is ammonia and carbon dioxide. After finishing, it reaches the use precision, forms a 30 um diffusion layer, and the surface hardness HV is greater than 450, which fully meets the use requirements.

Embodiment 3

[0022] The piston is made of 38CrMoAi material, which is cold-rolled into a precision steel pipe and cut according to the size of the piston. After rough machining, it is subjected to a thermal stabilization treatment at 800°C in an ammonia cracking atmosphere protection furnace. After finishing machining, it is subjected to liquid salt bath nitriding treatment. at 570°C for 4 hours, the ion concentration CNO - % is 36%, CN - % is 4%, CO 2 2- % is 19%, Na + % is 21%, K + % is 19%, Li + % is 1.2%, and the use precision is reached after finishing, forming a diffusion layer of 50 um, and the surface hardness HV is greater than 450, which fully meets the use requirements.

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Abstract

The invention relates to a piston for a rotary compressor and a manufacturing method of the piston. A matrix material for manufacturing the piston is piston coarse aggregate made from a 10#-50# carbon steel material or ferrous low alloy steel containing Ni, Cr and Mo. The manufacturing method is characterized by comprising the following steps of: carrying out rough grinding on the piston coarse aggregate first, then carrying out thermostabilization treatment, then carrying out nitriding treatment after the thermostabilization treatment, and finely grinding or polishing the piston subjected to nitriding treatment. According to the invention, materials with low cost in the market are used, which can completely meet the using requirements after being subjected to thermal treatment and nitriding treatment and can successfully substitute Ni-Cr-Mo alloy cast iron which has been used for 30 years, therefore the purposes of energy saving and consumption reduction are achieved.

Description

technical field [0001] The invention relates to a piston for a rotary compressor and a manufacturing method thereof. Background technique [0002] At present, the rotary air conditioner compressor is a commonly used compressor, and its working principle is as follows: figure 1 As shown, 1 cylinder, 2 pistons, 3 slides. When the compressor is working, the piston 2 purely rolls clockwise along the inner hole of the cylinder 1, and the sliding plate 3 is in contact with the piston 2 under the action of the spring force, separating the cylinder 1 into two sealed parts A and B. When piston 2 purely rolls clockwise, chamber A expands—suction, chamber B decreases—compresses. When the piston 2 rotates to the bottom dead center, the cavity B is reduced to the minimum, the pressure reaches the maximum, and the exhaust is carried out. Continue to rotate, chamber A starts to compress, chamber B starts to inhale, and the cycle repeats. The piston is an important part of the air condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C29/00C21D9/00C23C8/26C23C8/36C23C8/50
Inventor 阮吉林魏成刚陈朱乐
Owner 浙江百达精工股份有限公司
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