Staggered four-way reversing valve body inner wall tin bronze composite bush
A four-way reversing valve, tin bronze technology, applied in the direction of multi-way valves, valve devices, bearing components, etc., can solve the problems of piston stuck, valve scrapping, friction coefficients seized together, etc., to reduce wear and Leakage, easy to get stuck, long service life
Inactive Publication Date: 2017-11-17
XUZHOU SHUNFENG VALVE
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Problems solved by technology
[0002] In the existing large-capacity cross-type electromagnetic four-way reversing valve, the piston is easily stuck in the valve body. Because the material of the piston is 40Cr, the material of the valve body in contact with it is 45# steel, and the friction coefficient of the two materials is the same during use. Because the friction coefficient increases when the system pressure is too high, it is easy to bite together, causing the valve to be scrapped
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Embodiment
[0022] A tin-bronze composite bushing, the material composition of which is 10% lead, 10% tin, and the balance is copper and trace elements, is prepared by powder metallurgy. Firstly, the copper-lead-tin alloy powder with a thickness of about 0.6 mm is spread on the clean cold-rolled low-carbon steel plate substrate, and the composite material is obtained through sintering, initial rolling, re-sintering, and re-rolling; the material is sintered in It is carried out in a high-temperature mesh belt sintering furnace and protected by ammonia decomposition atmosphere N2 and H2. The main function of the sintering atmosphere is to control the chemical reaction between the alloy powder and the environment, which can reduce the oxide film on the surface of the powder particles, promote sintering, and prevent The role of further oxidation of materials, primary sintering temperature 850~880 e , holding time 15 min; secondary sintering temperature 820~850 e , holding time 15 min, rolling ...
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Abstract
The invention relates to a staggered four-way reversing valve body inner wall tin bronze composite bush. The staggered four-way reversing valve body inner wall tin bronze composite bush comprises an upper bush part, a middle bush part and a lower bush part; the three parts are the same in diameter, and are connected in sequence in the axial direction; four through holes are uniformly distributed in the peripheral direction of the middle bush part; when the bush is mounted with a valve body of a four-way reversing valve, the bush is tightly pressed to bond on the inner wall of the valve body; the through holes are respectively corresponding to four valve ports of the valve body; and sealing rings are arranged between two ends of the bush and end covers of the valve body. The bush solves the defect of easy blockage of a piston, and reduces wear and leakage between the piston and the valve body; and the machining precision of a matching clearance with the piston is accurate to 0.005 mm. The service life of the valve body is longer; and the continuous reversing life can reach 100000 times.
Description
technical field [0001] The invention relates to the refrigeration and air-conditioning industry, in particular to a tin-bronze composite bushing on the inner wall of a cross-type four-way reversing valve. Background technique [0002] In the existing large-capacity cross-type electromagnetic four-way reversing valve, the piston is easily stuck in the valve body. Because the material of the piston is 40Cr, the material of the valve body in contact with it is 45# steel, and the friction coefficient of the two materials is the same during use. Because the friction coefficient increases when the system pressure is too high, it is easy to bite together, causing the valve to be scrapped. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a tin-bronze composite bushing on the inner wall of a cross-type four-way reversing valve, which solves the shortcoming that the piston is easily stuck. [0004] The prese...
Claims
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IPC IPC(8): F16C33/14F16K11/00
CPCF16C33/14F16K11/00
Inventor 刘文昊
Owner XUZHOU SHUNFENG VALVE