Cast three-piece symmetrical floating-ball elastic-seal duplex switchable filter

Abstract

The invention discloses a cast three-piece symmetrical floating-ball elastic-seal duplex switchable filter in the field of industrial pipeline medium circulation and filtration. According to the switchable filter, three-piece type connection is adopted in a case, so that a control chamber and two filtration chambers are formed. An upper rotating shaft, a lower rotating shaft, an upper three-way ball, a lower three-way ball and a plurality of elastic seal pair combinations are arranged in the control chamber, wherein the elastic seal pair combinations ensure the seal connection between the upper three-way ball and the lower three-way ball and inlets or outlets of the filtration chambers. According to the switchable filter, the technical problems that the assembly sealing property of an existing integrally-cast case and a two-piece cast connection type case is poor, switching torque of a handle is large and switching is difficult are solved. As the upper three-way ball and the lower three-way ball in the structure are matched with elastic seal pairs composed of seal rings and elastic seal rings of the corresponding structural design, the compression amount can be measured, and the elasticity can be controlled. Moreover, a certain pre-tightening force is possessed under low pressure after a main case and an auxiliary case are combined, the sealing property is good, and the torque for switching the handle is small when the switchable filter works under the environment of high-pressure media.

Description

technical field [0001] The invention relates to a cast three-piece symmetrical floating ball elastic-seal double-connected switchable filter in the field of medium flow filtration of industrial pipelines. When the filter basket in one of the chambers is clogged and the pressure drop is too large, there is a safety hazard. , It can be switched to the clean filter basket in the other side of the chamber for filtration. The filter basket in the clogged chamber can be disassembled and cleaned and reinstalled for use, so that the machinery, equipment and pipelines can continue to operate normally without stopping. Background technique [0002] At present, there are two types of shell structures of known cast duplex switchable filters: namely, integral cast shells and two-piece cast connected shells. The principle of its main structure is that the handle rotates the upper and lower shafts to control the opening and closing of the two three-way balls to switch the filter chamber. ...

AI Technical Summary

Problems solved by technology

However, under the condition of high-pressure medium, the superposition of the pretightening force of the two spheres and the thrust of the high-pressure medium seal will produce a greater rotational torque on the three-way ball, which will make it very difficult for the handle to switch the two three-way balls to open and close

At the same time, due to the long rotation dimension chain of the upper and lower three-way balls, and the shape and position tolerance of the sealing assembly is difficult to guarantee, the sealing performance of the two-piece duplex filter is also poor.

There is still a shortcoming in the above two products: the positioning element is unreliable when the lower three-way ball is assembled, and the processing, assembly and adjustment are not convenient enough.

Among them, the extension end of the external adjustment screw of the two-piece duplex filter is too long, which is prone to bumps, especially the rubber seal O-ring at the lower end is partially damaged during assembly, and the safety and reliability of the seal is not good.

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