High-pressure filter for hydraulic operating mechanism control valve

Abstract

The invention relates to the field of oil filtration, in particular to a high-pressure filter for a control valve of a hydraulic operating mechanism. The high-pressure filter for the control valve of the hydraulic operating mechanism comprises a shell, a medium channel is formed in the shell, a filter element is arranged in the medium channel and comprises an outer-layer net cylinder, an inner-layer net cylinder and a sintering filter screen, the outer-layer net cylinder is fixedly installed in the shell, a gap is reserved between the outer-layer net cylinder and the inner wall of the shell, the inner-layer net cylinder is installed in the sintering filter screen, and the sintering filter screen is arranged in the shell. The opening end of the inner-layer net cylinder is not lower than the opening end of the sintering filter screen so that the inner-layer net cylinder can be tightly matched with the sintering filter screen, the sintering filter screen and the inner-layer net cylinder are arranged in the outer-layer net cylinder together, and the opening end of the inner-layer net cylinder is not lower than the opening end of the outer-layer net cylinder so that the outer surface of the sintering filter screen can be tightly matched with the outer-layer net cylinder. The high-pressure filter for the control valve of the hydraulic operating mechanism is compact and small in structure, can be arranged in the control valve for use, and is high in liquid flow impact resistance and pressure resistance.

Description

Technical Field

[0001] The invention relates to the field of oil filtration, and in particular to a high-pressure filter for a hydraulic operating mechanism control valve. Background Art

[0002] High-pressure filters are essential devices in pressure lines. Their function is to filter impurities in the oil in the pressure line to prevent impurities in the oil from contaminating the components in the hydraulic operating mechanism, ensuring that the equipment can work normally and operate for a long time. Currently, most commonly used high-pressure filters are external high-pressure filters. Their basic structure is to encapsulate the filter element in a metal pressure-resistant shell, and to open oil inlet and outlet interfaces on the shell. When in use, a special docking interface needs to be set on the hydraulic operating mechanism to connect the high-pressure filter. At the same time, since the working pressure of the high-pressure port of the disc spring hydraulic operating mechanism control valve is generally above 50MPa, most of the existing high-pressure filters cannot meet the use requirements of working pressures above 50MPa.

[0003] A Chinese utility model patent with authorization announcement number CN215214206U and authorization announcement date December 17, 2021 discloses a filter for a hydraulic operating mechanism, the filter comprising a filter housing and a filter cartridge, the filter cartridge comprising an inner mesh cartridge and an outer mesh cartridge. When in use, the filter is built into the pipeline between the oil tank and the low-pressure chamber of the energy storage cylinder, and can keep impurities in the oil tank out of the energy storage cylinder. It can withstand larger hydraulic shocks at the oil drain hole of the energy storage cylinder, but the hydraulic shock of the high-pressure hole of the hydraulic operating mechanism control valve is much greater than the hydraulic shock at the oil drain hole of the energy storage cylinder. The safety pressure upper limit of the filter is insufficient, and therefore it is not suitable for the high-pressure environment of the hydraulic operating mechanism control valve.

[0004] A Chinese utility model patent with the authorization announcement number CN208260312U and the authorization announcement date of December 21, 2018 discloses a high-pressure filter, which includes a valve body, a valve cover and a filter device. The filter device includes an outer cylinder with through holes, a mesh inner cylinder and a filter element. The inner cylinder and the filter element are installed in the outer cylinder, and the inner cylinder is arranged between the outer cylinder and the filter element. The filter element adopts a sintered structure with high strength. The filter device is a three-layer structure and can adapt to higher working pressures. However, the filter element of the high-pressure filter is arranged in the inner cylinder, and the inner cylinder and the outer cylinder only play the role of buffering the high-pressure oil for the filter element. After long-term use, there is still a problem that the filter element is deformed under the action of high-pressure oil, affecting the filtering effect. Summary of the invention

[0005] The object of the present invention is to provide a high-pressure filter for a hydraulic operating mechanism control valve, so as to solve the problem that the filter element of the existing high-pressure filter is deformed and affects the filtering effect after long-term use.

[0006] To achieve the above purpose, the high-pressure filter for the hydraulic operating mechanism control valve of the present invention adopts the following technical solutions: A high-pressure filter for a hydraulic operating mechanism control valve comprises a housing, a medium channel is provided on the housing, a filter element is arranged in the medium channel, the filter element comprises an outer mesh cylinder, an inner mesh cylinder and a sintered filter screen, the outer mesh cylinder, the inner mesh cylinder and the sintered filter screen are all cylindrical structures with one end open, an outer mesh cylinder ring is arranged at the opening of the outer mesh cylinder, the outer mesh cylinder is fixedly installed in the housing and a gap is left between the outer mesh cylinder and the inner wall of the housing, the inner mesh cylinder is loaded into the sintered filter screen, the opening end of the inner mesh cylinder is not lower than the opening end of the sintered filter screen so that the inner mesh cylinder and the sintered filter screen are closely matched, the sintered filter screen and the inner mesh cylinder are loaded into the outer mesh cylinder together, the opening end of the inner mesh cylinder is not lower than the opening end of the outer mesh cylinder so that the outer surface of the sintered filter screen is closely matched with the outer mesh cylinder.

[0007] Furthermore, the shell is provided with a shell stopper matched with the outer mesh tube ring stopper and a shell welding groove for welding connection with the outer mesh tube.

[0008] Furthermore, the outer mesh tube ring platform is provided with an outer mesh tube stop and an outer mesh tube welding groove for welding connection with the inner mesh tube.

[0009] Furthermore, an inner layer mesh tube ring platform cooperating with the outer layer mesh tube stop is provided at the opening of the inner layer mesh tube.

[0010] Furthermore, a flange that cooperates with the stopper of the outer mesh tube is provided at the opening of the sintered filter.

[0011] Furthermore, a radial sealing ring groove for installing a sealing ring is provided on the outer wall of the shell.

[0012] Furthermore, a plurality of oil holes are evenly arranged on the circumference and bottom surface of the outer mesh cylinder, and a plurality of oil holes are evenly arranged on the circumference and bottom surface of the inner mesh cylinder. The oil holes on the outer mesh cylinder and the oil holes on the inner mesh cylinder are aligned and connected.

[0013] Furthermore, the bottom thickness of the outer mesh tube is greater than the bottom thickness of the inner mesh tube.

[0014] Furthermore, the shell welding groove is a V-shaped groove.

[0015] Furthermore, the welding groove of the outer mesh tube is a V-shaped groove.

[0016] Beneficial effects: The high-pressure filter for the hydraulic operating mechanism control valve of the present invention is an improved invention. The high-pressure filter for the hydraulic operating mechanism control valve of the present invention includes a housing and a filter element. The filter element is a three-layer structure, including an inner mesh cylinder and an outer mesh cylinder of inner and outer layers and a sintered filter screen between the two. The three are tightly fitted, so that the filter element has stronger resistance to liquid flow impact and pressure resistance. The sintered filter screen is not easy to deform or damage under long-term use; a gap is left between the outer mesh cylinder and the inner wall of the housing to ensure that the oil can seep out from the outer wall of the outer mesh cylinder. The high-pressure filter for the hydraulic operating mechanism control valve of the present invention has a compact structure and can be built into the control valve for use. It has strong resistance to liquid flow impact and pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a high-pressure filter for a hydraulic operating mechanism control valve of the present invention; Figure 2 The invention relates to a high pressure filter for a hydraulic operating mechanism control valve. Figure 1 A front view of a sintered filter screen of an embodiment; Figure 3 The invention relates to a high pressure filter for a hydraulic operating mechanism control valve. Figure 1 A top view of a sintered filter according to an embodiment.

[0018] In the figure: 1. Shell; 2. Outer mesh cylinder; 3. Inner mesh cylinder; 4. Sintered filter; 5. Outer mesh cylinder ring; 6. Sealing ring groove; 7. Shell stop; 8. Shell welding groove; 9. Outer mesh cylinder stop; 10. Outer mesh cylinder welding groove; 11. Flanging; 12. Inner mesh cylinder ring; 13. Inner mesh cylinder oil hole; 14. Outer mesh cylinder oil hole. DETAILED DESCRIPTION

[0019] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0020] The high-pressure filter for the hydraulic operating mechanism control valve of the present invention has a compact overall structure and can be built into an oil pipeline for use. The filter screen of the filter element adopts a sintered filter screen, which has higher strength. At the same time, the filter screen, the inner mesh tube and the outer mesh tube are tightly fitted, which enhances the filter screen's resistance to liquid flow impact and pressure without affecting the flow capacity. The sintered filter screen is not easily deformed or damaged under long-term use.

[0021] In a basic embodiment, Figure 1As shown, the housing 1 has a central through hole, and the filter element is installed in the housing 1. The filter element is divided into three layers, which are the inner mesh tube 3, the sintered filter screen 4 and the outer mesh tube 2 from the inside to the outside. The inner mesh tube 3, the sintered filter screen 4 and the outer mesh tube 2 are all cylindrical structures with one end open. The open end of the inner mesh tube 3 is not lower than the open ends of the outer mesh tube 2 and the sintered filter screen 4, so that the inner mesh tube 3, the sintered filter screen 4 and the outer mesh tube 2 can fit tightly. The sintered filter screen 4 is fixed by the outer mesh tube 2 and the inner mesh tube 3, so that the structure of the filter element is more stable. The opening of the outer mesh tube 2 is provided with an outer mesh tube ring 5 extending radially outward. The outer mesh tube ring 5 can leave a gap between the outer mesh tube 2 and the inner wall of the housing 1 when the filter element is installed in the housing 1, so that the hydraulic oil can flow out from the outer wall of the outer mesh tube after filtering.

[0022] In a preferred embodiment, a shell stop 7 is provided on the shell 1 to cooperate with the outer mesh tube ring 5, and a shell welding groove 8 is provided at the connection between the shell stop 7 and the outer mesh tube 2. The shell stop 7 facilitates the installation of the outer mesh tube 2 in the shell 1, and the shell welding groove 8 facilitates the welding of the shell 1 and the outer mesh tube 2 together; after the outer mesh tube 2 is installed in the shell 1, a gap is left between the outer wall of the outer mesh tube 2 and the inner wall of the shell 1, so that the filtered oil can flow out from the gap through the outer mesh tube 2.

[0023] In other embodiments, the shell stop 7 may not be provided on the shell 1, and the outer mesh tube 2 is directly welded to the inside of the shell 1. Since there is an outer mesh tube ring platform 5 at the opening of the outer mesh tube 2, there will be a gap between the outer mesh tube 2 after the outer mesh tube 2 is installed in the shell 1, and the filtered oil can flow out from the gap through the outer wall of the outer mesh tube 2.

[0024] In a preferred embodiment, an outer mesh tube stop 9 is provided on the outer mesh tube ring platform 5 to facilitate the installation of the inner mesh tube 3 and the sintered filter screen 4 in the outer mesh tube 2, and an outer mesh tube welding groove 10 is provided at the connection between the outer mesh tube stop 9 and the inner mesh tube 3 to facilitate the welding of the inner mesh tube 3 to the outer mesh tube 2.

[0025] In other embodiments, the outer mesh tube stop 9 may not be provided on the outer mesh tube ring 5, and the inner mesh tube 3 and the sintered filter screen 4 may be directly welded inside the outer mesh tube 2 to fix the sintered filter screen 4 between the outer mesh tube 2 and the inner mesh tube 3.

[0026] In a preferred embodiment, an inner mesh tube ring platform 12 cooperating with the outer mesh tube stop 9 is provided at the opening of the inner mesh tube 3, so as to facilitate the fixed installation of the inner mesh tube 3 and the sintered filter screen inside the outer mesh tube 2. The inner mesh tube ring platform 12 is installed on the outer mesh tube stop 9 so that the inner mesh tube 3, the sintered filter screen 4 and the outer mesh tube 2 are tightly fitted, thereby improving the stability of the filter element and the ability of the sintered filter screen 4 to resist liquid flow impact.

[0027] In other embodiments, the inner mesh tube 3 may not be provided with the inner mesh tube ring 12 and may be directly fixedly connected to the sintered filter screen 4 and welded together inside the outer mesh tube 2, which can also improve the stability of the filter element and the ability of the sintered filter screen 4 to resist liquid flow impact.

[0028] In a preferred embodiment, Figure 2 , 3 As shown, a flange 11 is provided at the opening of the sintered filter screen 4. The existence of the flange 11 facilitates the close fit between the sintered filter screen 4 and the inner mesh tube 3, and at the same time allows the outer wall of the sintered filter screen 4 to closely fit with the inner wall of the outer mesh tube 2, making the structure of the filter element more stable and improving the ability of the sintered filter screen 4 to resist liquid flow impact.

[0029] In other embodiments, the sintered filter screen 4 may not be provided with flanges and may be directly welded to the inner wall of the outer mesh tube 2, which can also improve the stability of the filter element structure.

[0030] In a preferred embodiment, a radial sealing ring groove 6 is opened on the outer peripheral surface of the housing 1, and a sealing ring is arranged in the sealing ring groove 6. When the filter is installed in the high-pressure oil hole of the control valve, the sealing ring in the sealing ring groove 6 can be sealed with the high-pressure oil hole of the control valve to ensure that the hydraulic oil is filtered through the high-pressure filter when the hydraulic oil enters the control valve from the oil pipeline.

[0031] In other embodiments, there may be multiple sealing ring grooves 6 to ensure a better sealing effect between the filter and the high-pressure port of the control valve, and to ensure that the hydraulic oil passes through the filter and enters the high-pressure chamber of the control valve.

[0032] In a preferred embodiment, a plurality of outer mesh cylinder oil holes 14 are evenly opened on the circumference and bottom surface of the outer mesh cylinder 2, and a plurality of inner mesh cylinder oil holes 13 are evenly opened on the circumference and bottom surface of the inner mesh cylinder 3. The outer mesh cylinder oil holes 14 and the inner mesh cylinder oil holes 13 are aligned and connected, so that the hydraulic oil in the oil pipeline can be filtered and flowed out smoothly, thereby ensuring the flow capacity of the filter.

[0033] In other embodiments, a plurality of oil holes may be opened only on the outer circumferential surfaces of the outer mesh tube 2 and the inner mesh tube 3, and the oil holes on the outer mesh tube 2 and the inner mesh tube 3 are correspondingly connected to ensure the flow capacity of the filter.

[0034] In a preferred embodiment, the bottom thickness of the outer mesh tube 2 is greater than the bottom thickness of the inner mesh tube 3, which can further improve the overall strength of the filter element and prevent the inner mesh tube 3 from deforming during long-term use of the filter, affecting the use and filtering effect of the filter.

[0035] In other embodiments, the bottom thickness of the outer mesh tube 2 can be equal to the bottom thickness of the inner mesh tube 3. The bottom thicknesses of the outer mesh tube 2 and the inner mesh tube 3 are both relatively thick, which can also prevent the outer mesh tube 2 and the inner mesh tube 3 from being deformed during long-term use of the filter, affecting the use and filtering effect of the filter.

[0036] In a preferred embodiment, the shell welding groove 8 and the outer mesh tube welding groove 10 are both V-shaped welding grooves, which facilitate welding between the outer mesh tube 2 and the shell 1, and between the inner mesh tube 3 and the outer mesh tube 2.

[0037] In other embodiments, the shell welding groove 8 and the outer mesh tube welding groove 10 may be U-shaped grooves. The U-shaped welding grooves may also facilitate welding between the outer mesh tube 2 and the shell 1 and between the inner mesh tube 3 and the outer mesh tube 2.

[0038] The specific implementation of the high-pressure filter for the hydraulic operating mechanism control valve of the present invention is as follows: When in use, the high-pressure filter for the hydraulic operating mechanism control valve of the present invention is installed in the high-pressure oil hole of the control valve. The sealing ring in the sealing ring groove 6 on the housing 1 can seal the housing 1 and the high-pressure oil hole of the control valve. The hydraulic oil in the oil pipeline is filtered through the sintered filter screen 4 in the filter and then enters the high-pressure port of the control valve, and then the control valve is subjected to a running-in test.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A high-pressure filter for a hydraulic operating mechanism control valve, comprising a housing, a medium channel is opened on the housing, a filter element is arranged in the medium channel, and the characteristics are: The filter element includes an outer mesh cylinder, an inner mesh cylinder and a sintered filter screen. The outer mesh cylinder, the inner mesh cylinder and the sintered filter screen are all cylindrical structures with one end open. An outer mesh cylinder ring is provided at the opening of the outer mesh cylinder. The outer mesh cylinder is fixedly installed in the shell and a gap is left between the outer mesh cylinder and the inner wall of the shell. The inner mesh cylinder is loaded into the sintered filter screen. The open end of the inner mesh cylinder is not lower than the open end of the sintered filter screen so that the inner mesh cylinder and the sintered filter screen fit tightly. The sintered filter screen and the inner mesh cylinder are loaded into the outer mesh cylinder together. The open end of the inner mesh cylinder is not lower than the open end of the outer mesh cylinder so that the outer surface of the sintered filter screen fits tightly with the outer mesh cylinder.

2. The high-pressure filter for a hydraulic operating mechanism control valve according to claim 1, characterized in that: The shell body is provided with a shell stopper matched with the outer mesh tube ring stopper and a shell welding groove used for welding connection with the outer mesh tube.

3. The high-pressure filter for a hydraulic operating mechanism control valve according to claim 1, characterized in that: The outer layer mesh tube ring platform is provided with an outer layer mesh tube stop and an outer layer mesh tube welding groove for welding connection with the inner layer mesh tube.

4. The high-pressure filter for a hydraulic operating mechanism control valve according to claim 3, characterized in that: An inner layer mesh tube ring platform matched with the outer layer mesh tube stop is arranged at the opening of the inner layer mesh tube.

5. The high-pressure filter for a hydraulic operating mechanism control valve according to claim 3, characterized in that: A flange matched with the stopper of the outer mesh tube is arranged at the opening of the sintered filter mesh.

6. The high-pressure filter for a hydraulic operating mechanism control valve according to any one of claims 1 to 5, characterized in that: A radial sealing ring groove for installing a sealing ring is provided on the outer wall of the shell.

7. The high-pressure filter for a hydraulic operating mechanism control valve according to any one of claims 1 to 5, characterized in that: A plurality of oil holes are evenly arranged on the circumference and bottom surface of the outer mesh cylinder, and a plurality of oil holes are evenly arranged on the circumference and bottom surface of the inner mesh cylinder. The oil holes on the outer mesh cylinder are aligned and connected with the oil holes on the inner mesh cylinder.

8. The high-pressure filter for a hydraulic operating mechanism control valve according to any one of claims 1 to 5, characterized in that: The bottom thickness of the outer layer mesh tube is greater than the bottom thickness of the inner layer mesh tube.

9. The high-pressure filter for a hydraulic operating mechanism control valve according to claim 2, characterized in that: The shell welding groove is a V-shaped groove.

10. The high-pressure filter for a hydraulic operating mechanism control valve according to claim 3, characterized in that: The outer mesh tube welding groove is a V-shaped groove.

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