Sealing ring for expansion valves of air conditioners of automobiles and method for preparing sealing ring

Abstract

The invention discloses a sealing ring for expansion valves of air conditioners of automobiles and a method for preparing the sealing ring, and relates to the technical field of accessories for air conditioners of automobiles. The sealing ring for the expansion valves of the air conditioners of the automobiles comprises, by weight, 100 parts of methylvinyl silicone rubber, 5-10 parts of hydroxyl silicone oil, 20-50 parts of gas-phase white carbon black, 8-15 parts of diatomaceous earth, 2-5 parts of light magnesium oxide, 5-10 parts of beta-cyclodextrin inclusion cashew nut shell oil, 0.5-1 part of dioctyl phthalate, 1-2 parts of peroxide vulcanizing agents, 0.5-1 part of zinc methacrylate and 0.5-1 part of flame retardants. The sealing ring and the method have the advantages that the sealing ring prepared by the aid of the method is excellent in oil resistance, abrasion resistance and self-lubricating property, low in frictional resistance, good in elasticity and long in service life and can be automatically elastically compensated when slightly abraded, and good sealing effects can be realized.

Description

technical field [0001] The invention relates to an automobile air conditioner accessory, in particular to a sealing ring for an expansion valve of an automobile air conditioner and a preparation method thereof. Background technique [0002] The expansion valve, also known as the throttle valve, is the main component of the automobile air-conditioning refrigeration system. It is generally installed at the entrance of the evaporator. It is the dividing point between the high pressure and the low pressure of the automobile air-conditioning refrigeration system. It is throttling and decompressed to become low-temperature and low-pressure wet steam, and then the refrigerant absorbs heat in the evaporator to achieve the cooling effect. The temperature-sensitive expansion valve used in the automotive air-conditioning refrigeration system is also called a thermal expansion valve. The temperature sensor at the outlet senses the superheat of the refrigerant vapor (superheat refers to ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the joint of the expansion valve of the automobile air conditioner is sealed with an end face sealing ring. Due to the small pressure on the sealing ring, refrigerant leakage occurs, and the sealing ring is prone to wear and tear, which will aggravate the leakage of refrigerant.