JPH01203011A - Hydraulic servo valve filter - Google Patents

Abstract

PURPOSE:To prevent defective operation of servo mechanism caused by iron content in oil by screwing a casing with a filter into a pressure equalization hole such as a hydraulic servo valve or the like. CONSTITUTION:A pressure equalization hole 7 of a cover 1 is threaded. A filter casing 9 is of column shape and is provided with a protruding section intermeshing with the thread of the pressure equalization hole 7 on the right end surface. A recessed section of coaxial column shape is provided on the left end, while a through-hole is bored along a shaft of a screw section and a 3mu sintering filter 8 is inserted and fixed coaxially on the recessed section. Said filter casing 9 is screwed and mounted on a cover 1 through an O-ring 10 by striking a screw driver along a slit. As high pressure oil comes in and out passing through the 3mu sintering filter 8, refuse iron content in the oil is prevented from entering and sticking or the like of the valve.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a control coil section of a hydraulic servo valve, etc. used inside a hydraulic system where the atmospheric pressure changes, such as a diving machine, due to the iron content floating in the hydraulic oil. This invention relates to a hydraulic servo valve filter that prevents servo mechanisms from malfunctioning.

[Conventional technology]

A conventional example will be explained with reference to FIGS. 4 and 5.

In FIG. 4, a cover 1 of the hydraulic servo valve is attached to a main body case 2 via a gasket, and is a closed type button to prevent dust, particularly iron, from entering the valve. Therefore, if the cover 1 is used in high pressure oil as it is, the cover 1 will be damaged, so the cover 1 has been used with a pressure equalizing hole 7 as shown in FIG.

[Problem to be solved by the invention]

The above conventional technology has the following problems (1) and (2).
) or 4).

(1) Iron in the oil flowing in and out from the pressure equalization hole 7 adheres to the internal magnet, causing the servo valve to stick.

(2) Prevent the servo valve from sticking.

(3) Preventing contamination of the oil sealed in the servo valve unit.

(4) Improving the reliability of oil-immersed servo valves.

[Means to solve the problem]

The present invention takes the following measures to solve the above problems.

That is, in a casing having a pressure equalizing hole such as a hydraulic servo valve used in high-pressure oil where atmospheric pressure changes, it has a filter, a threaded part protruding from one end surface and screwed to the same pressure equalizing hole, and a threaded part at the other end. The above-mentioned fill is provided so that its axis is coaxial with the axis.

[Effect]

By the above means, the iron content in the external oil that enters the casing from the pressure equalization hole is removed by the filter, thereby preventing the servo valve from sticking. Additionally, the overhaul period for the servo valve can be extended. Furthermore, the number of times the solenoid valve unit is opened can be reduced, leading to prevention of loss of sealed oil. (Replace with new oil each time the solenoid valve unit is opened).

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that the description of the parts described in the conventional example will be omitted.

In FIG. 1, the pressure equalizing hole 7 of the cover 1 is threaded. The filter casing 9 has a cylindrical shape and has a threaded portion on its right end surface that engages with and projects from the thread of the pressure equalizing hole. Further, the left end portion has a coaxial cylindrical recess, and a through hole is formed along the axis of the threaded portion. Further, a slot is cut in the left end surface of the filter casing 9. Further, a 3μ sintered filter 8 is coaxially inserted and attached to the recess.

In the above configuration, the filter casing 9 is screwed through the O-ring 10 by applying the cover IK and a screwdriver to the slot 11. In high-pressure oil, oil enters and exits through the 3μ sintered filter 8, which prevents iron particles from entering the oil.

In this way, valve sticking etc. are prevented.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

(1) The pressure inside and outside can be equalized through a filter, adapting to the atmospheric pressure.

(2) Prevent the intrusion of fine particles, especially iron, floating in the atmospheric oil.

(3) It prevents the electric/hydraulic servo valve from becoming uncontrollable due to the intrusion of iron and improves reliability, making it possible to extend the operating time of diving models, etc.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a detailed vertical sectional view of a part of the filter in Fig. 1, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a perspective view of a conventional example. 5 are configuration diagrams of the conventional example. In the figure 1...Cover, 2...Main case, 7.
・・・Pressure equalization hole, 8...Filter, 9...
Filter casing, 10...0 ring, 11...
・Slot.

Claims (1)

[Claims] In a casing having a pressure equalizing hole such as a hydraulic servo valve used in high-pressure oil where atmospheric pressure changes, the casing has a filter and a threaded part protruding from one end surface and threadedly connected to the same pressure equalizing hole, and the same threaded part at the other end. A hydraulic servo valve filter comprising a filter casing having a recess for housing the filter whose axis is coaxial with the axis of the threaded part, and a filter casing having a through hole coaxial with the axis of the threaded part. .