Pressure reducing valve for household water purifier

Abstract

The invention discloses a special pressure reducing valve for household water purifiers, which comprises a front cover, a valve core shaft, a compression loading spring, a piston assembly, a rear cover and a sealing ring. The convex spherical surface of R, driven by the bidirectional force of the compression loaded spring, the convex spherical surface matches the concave spherical surface base with radius R on the front and rear covers respectively, forming a spherical surface matching automatic centering structure; When the pressure relief valve is assembled, the spherical surface cooperates with the automatic centering structure so that the valve core shaft and the piston are constrained by the spherical surface, which reduces the degree of freedom and improves the concentricity to realize automatic centering; when the special pressure reducing valve is working, when the piston and the valve core shaft When there is a coaxiality error in the sliding fit, eccentric sliding resistance and rotational torque are generated to push the valve mandrel to interact and align around the center of the convex spherical surface. Therefore, the coaxiality of the two is improved, the running resistance of the moving pair is reduced, and the sensitivity and the stability of the output characteristics of the pressure reducing valve are improved.

Description

technical field [0001] The invention relates to the technical field of pressure reducing valves, in particular to a special pressure reducing valve used in domestic water purifiers, water household appliances, and household safety water supply devices for drinking water in high-rise buildings. Background technique [0002] Since the traditional pressure reducing valve came out in the 18th century, with the passage of time and the advancement of science and technology, it has developed rapidly into a special pressure reducing valve. For example: steam pressure reducing valve, liquefier pressure reducing valve, oxygen, nitrogen, ammonia, chlorine, argon, propylene, acetylene and other special pressure reducing valves have dozens of categories. The purpose of developing these special decompression is to make its performance more in line with the special requirements of special places and media. Household water purifiers are equipped with a pressure reducing valve that can prot...

AI Technical Summary

Problems solved by technology

However, the amount of pressure reducing valves used in water purifiers is less than 1 / 10. The reason is not that the anti-knock performance of water purifiers has reached the level of the US "NSF" standard without pressure reducing valves, but that the existing pressure reducing valves Unreliable and poor adaptability

However, the components of the plastic component pressure reducing valve are processed by injection molding at one time. The draft taper, the shrinkage of the part, and the injection defects of the parting line seriously affect the precision of the part. Therefore, the performance of the plastic component pressure reducing valve is poor.

Therefore, the pressure reducing valve imported from Germany and Italy insists on using metal materials for manufacturing, but there is a problem of high cost.

[0009] 2). The piston assembly of household plastic pressure reducing valve has the problem of loosening and detachment of the rubber plug: the reason is that between the elastic plane rubber plug and the seat hole of the rubber plug, only the elastic interference of the diameter D of the rubber plug is used to squeeze Tight seat hole, forming static fit positioning

Under the alternating stress of Fz and Fm, the rubber plug accelerates aging and decay, and the situation of loosening and detachment occurs naturally, resulting in the failure of the pressure reducing valve

[0010] 3). Household plastic pressure reducing valves do not meet the performance requirements of no decompression after the valve is installed when the user's water pressure is less than or equal to 0.1MPa.

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