Micro centrifugal non-screen fine particle filter for servo valve

Abstract

The present invention relates to a micro centrifugal non-screen fine particle filter for a servo valve, comprising an upper shell and a lower shell, wherein the upper shell is placed on the upper part of the lower shell, the upper shell and the lower shell are built with a conical sleeve, the lower part of the conical sleeve is built with an upper part of an oil return device, and a vortex generator is installed on the upper part of the oil return device. The present invention can solve the problems of low filtering efficiency in the prior art, increase the reliability and maintainability of the oil filter, simplify the structure of the existing centrifugal filter, and reduce the oil pressure.

Description

Technical Field

[0001] The invention relates to a hydraulic servo valve, in particular to a filter for filtering fine particles used in the hydraulic servo valve. Background Art

[0002] The oil filter installed on the traditional servo valve is a filter installed on the oil filter frame to filter fine particles. This type of oil filter will cause insufficient filtration in the actual environment due to fine particles and other reasons; the filter is usually completed by a welding process, and there is a high probability that the solder will fall off, collapse, or break through the filter after being flushed by oil for a long time, causing leaks or new pollution; the existing oil filter is installed inside the servo valve body, which makes periodic maintenance more difficult, and multiple disassembly can easily cause thread damage and secondary pollution during cleaning. At the same time, its fuel economizer cannot effectively reduce the oil pressure.

[0003] Existing centrifugal filters are usually large in size and require motors, shaft blades and other structures to achieve the rotation of the internal medium, which makes the overall structure lengthy; and the more structures there are, the lower the overall reliability of the filter, which is absolutely undesirable in the field of servo valves.

[0004] To solve the above problems, a butterfly filter is formed by pressing several layers of filter screens of different materials. This type of oil filter will significantly reduce the filtering effect of the oil filter due to clogging after being used for a period of time, and at the same time increase the oil pressure around the oil filter, which may cause the servo valve to work less effectively. Summary of the invention

[0005] In order to improve the current situation of low filtering efficiency of existing servo valve oil filters, the present invention proposes a micro centrifugal non-screen fine particle filter for a servo valve, which adopts a new structure to increase the reliability and maintainability of the oil filter; the oil filter components are mechanically connected, reducing the problem of secondary contamination of the oil due to processing problems; the structure of the existing centrifugal filter is simplified, and the smaller structural characteristics can better cooperate with the servo valve; and the pressure of the oil can be effectively reduced.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a micro centrifugal non-screen fine particle filter for a servo valve, comprising an upper shell and a lower shell, wherein the upper shell is placed on the upper part of the lower shell, and the upper shell and the lower shell are provided with a conical sleeve, and the lower part of the conical sleeve is provided with an upper part of an oil return device, and a vortex generator is installed on the upper part of the oil return device.

[0007] Furthermore, the vortex generator is provided with a hemispherical groove for converting the injected oil into a vortex.

[0008] Furthermore, the tapered sleeve is fixed on the upper small flange platform of the upper shell.

[0009] Furthermore, the oil return device is connected with the oil return device in a concentric manner.

[0010] Furthermore, the lower end of the oil return device is fixed to the inner groove surface of the servo valve through threads and stops at the upper part of the flange platform of the oil return device.

[0011] Furthermore, the lower shell is threadedly connected to the upper shell and assembled into a whole.

[0012] Furthermore, a groove for installing a sealing rubber ring is provided between the lower part of the oil return device and the flange platform and the lower boss.

[0013] Furthermore, the small flange of the upper shell is provided with evenly distributed small holes for collecting reverse reflux oil into the main flow channel.

[0014] Beneficial effects of the present invention:

[0015] The present invention realizes the lengthy structure of the traditional centrifugal filter by using a vortex generator and a conical sleeve; the impurities are thrown out of the conical sleeve after the oil with particles passes through the conical sleeve, and the clean oil in the center is collected by the oil return device, thereby eliminating the filter structure; the oil return device enters the servo valve slot through a mechanical connection, and no secondary pollution is caused when the remaining structure is dismantled and cleaned; the momentum loss of the oil is caused after the oil is injected into the vortex generator, and the structure can significantly reduce the hydraulic pressure, which is more scientific than the design of reducing the oil pressure by the oil economizer on the existing servo valve.

[0016] Compared with the existing servo valve filter:

[0017]

[0018] Compared with the existing centrifugal filter: it can solve the low filtering efficiency existing in the prior art, increase the reliability and maintainability of the oil filter, simplify the structure of the existing centrifugal filter, and reduce the oil pressure.

[0019] The filter of the present invention greatly simplifies the structure and achieves the same effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the structure of the servo valve micro centrifugal non-screen fine particle filter of the present invention;

[0021] Figure 2 It is the exploded view of the filter;

[0022] Figure 3 This is a detailed view of the interior of the upper shell;

[0023] Figure 4 This is a detailed picture of the oil return device. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] The working principle of the structure of the present invention is that the oil is injected into the vortex generator on the upper part of the oil filter through the small hole in the upper shell body to generate a vortex, and the rectified oil fluid is reversely flushed on the inner surface of the upper shell body, and the oil is secondary rectified by the tapered sleeve to accelerate the flow of the oil in the tapered sleeve, so that the particles in the oil are thrown to the outermost part of the oil under the action of centrifugal force and gravity, and finally deposited at the bottom of the lower shell body, and the clean oil in the center is collected by the oil return device; at the same time, the particles in the turbid oil are deposited at the lower part of the lower shell body due to gravity, and the remaining oil flows back to the upper bottom surface of the upper shell body through the gap between the lower shell body and the sleeve, and a small hole is left at the connection between the upper bottom surface and the tapered sleeve, and flows to the inside of the filter, thereby realizing the recovery of the oil.

[0026] like Figures 1 to 4 As shown, the micro centrifugal non-screen fine particle filter for the servo valve of the present invention comprises an upper shell 1, a conical sleeve 2, a lower shell 3, an oil return device 4, and a vortex generator 5.

[0027] The upper shell 1 is placed on the upper part of the lower shell 3, the tapered sleeve 2 is fixed on the upper small flange 31 of the upper shell 1, the upper part of the oil return device 4 is placed on the tapered sleeve 2, and is concentrically connected to the oil return device 4, a vortex generator 5 is installed on the upper part of the oil return device 4, and the lower end is fixed to the inner groove surface of the servo valve through threads and stops at its upper flange 42, the lower shell 3 is sleeved on the flange 42 of the oil return device 4, and is threadedly connected to the upper shell 1.

[0028] The vortex generator uses Stokes' theorem, and its main design is a hemispherical groove that converts the injected oil into a vortex.

[0029] The vortex generator structure can significantly reduce the oil pressure.

[0030] There is a slot on the top of the vortex generator to facilitate its installation on the oil return device.

[0031] The lower shell is fixed on the lower flange of the oil return device. The turbid oil outside the vortex is in the centrifugal force formula:

[0032] F=m×ω 2 ×

[0033] The metal particles are thrown out from the bottom of the conical sleeve and enter the lower shell. Due to the density, the metal particles will settle below. At this time, the lower shell serves as a closed cavity for fixing and collecting the metal particles.

[0034] There is a groove between the lower flange 42 and the lower boss 41 of the oil return device, the diameter of which is determined according to the size of the central oil hole, and a space is reserved here for the sealing rubber ring. In addition, this design can facilitate disassembly and assembly and subsequent maintenance and cleaning without causing secondary pollution.

[0035] The upper shell and the lower shell can be assembled into a whole. Starting from the lower shell and slowly moving upwards, the inner wall of the lower shell and the outer wall of the tapered sleeve become closer and closer; finally, the tapered sleeve is fixed on the small flange platform on the inner surface of the upper shell; there are evenly distributed small holes on the small flange platform to collect the reverse reflux oil and enter the main channel.

Claims

1. A micro centrifugal non-screen fine particle filter for a servo valve, comprising an upper housing, a lower housing, Features: The upper shell is placed on the upper part of the lower shell, and a conical sleeve is built into the upper shell and the lower shell. The upper part of the oil return device is built into the lower part of the conical sleeve, and a vortex generator is installed on the upper part of the oil return device; the vortex generator is provided with a hemispherical groove that converts the injected oil into a vortex; the lower end of the oil return device is fixed to the inner groove surface of the servo valve by threads and stops at the upper part of the flange platform of the oil return device; a groove for installing a sealing rubber ring is provided between the lower flange platform of the oil return device and the lower boss.

2. The micro centrifugal non-screen fine particle filter for a servo valve according to claim 1, Features: The tapered sleeve is fixed on the upper small flange platform of the upper shell body.

3. The micro centrifugal non-screen fine particle filter for a servo valve according to claim 1, Features: The tapered sleeve is connected to the oil return device in a concentrically matched manner.

4. The micro centrifugal non-screen fine particle filter for a servo valve according to claim 1, Features: The lower shell is threadedly connected to the upper shell and assembled into a whole.

5. The micro centrifugal non-screen fine particle filter for a servo valve according to claim 1, Features: The small flange of the upper shell is provided with evenly distributed small holes for collecting reverse reflux oil and feeding it into the main flow channel.

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