An integrated oil filter assembly for a servo valve

Abstract

An integrated oil filter assembly for a servo valve comprises orifices (1), oil filter outer plugs (2), filter pipes (3) and oil filter plugs (4). The two ends of each filter pipe (3) are fixedly connected with the corresponding oil filter outer plug (2) and the corresponding oil filter plug (4) in a welded manner. Through holes of the oil filter outer plugs (2) are step holes, and round holes, in the sides, close to the filter pipes (3), of the step holes are smaller than inner holes, in the sides close to the orifices, of the outer portions. One side of each orifice (1) is of an external thread structure, the outer circles of the other sides of the orifices (1) are arranged in the inner holes in one sides of the oil filter outer plugs (2), and the orifices (1) are in interference fit with the oil filter outer plugs (2). Conical holes are formed in one sides of the external thread structures of the orifices (1), small holes penetrate conical tips, and cylindrical holes are formed in the other sides of the external thread structures of the orifices (1). Two oil filter assembly bodies are symmetrically arranged in a shell (5). Plugs (6) are arranged at the outer ends of the orifices (1) and fixed to the shell (5) through end covers (8). According to the integrated oil filter assembly, the orifices can be demounted rapidly, the pass of percent of products can be remarkably increased, and production cost can be reduced.

Description

technical field [0001] The invention relates to an integrated oil filter assembly for a servo valve with a quickly detachable orifice and belongs to the field of hydraulic control. Background technique [0002] The electro-hydraulic servo valve is a control device that precisely controls the magnitude and direction of the output flow or pressure by the input current. It is the key control element of the electro-hydraulic servo mechanism of aerospace vehicles such as rockets and missiles. The oil filter assembly is installed between the oil supply channel of the servo valve and the pre-stage oil channel, and its function is to ensure the cleanliness of the hydraulic oil leading to the pre-stage, and provide a stable pressure for the pre-stage through the orifice. A servo valve has two oil filter assemblies, and the flow difference between the paired two oil filter assemblies must be controlled within a certain range. The main problems in the production process are as follows...

AI Technical Summary

Problems solved by technology

[0003] ● Difficult to match

Select two orifices whose flow rate meets the requirements, and conduct electron beam welding with the filter tube respectively. After welding, when the flow rate of the two oil filter components is retested, the flow rate of some products has changed and cannot meet the matching requirements.

[0004] ●Low pass rate

Due to the change of the flow rate of the oil filter assembly after welding, the original qualified orifice can only be scrapped, and the pass rate is low, resulting in the waste of oil filter assembly and the prolongation of product production cycle

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