Static pressure transfer filter

Abstract

The present application relates to the field of hydraulic system filtering equipment, and in particular to a static pressure transmission filter, which includes a static pressure transmission filter, including a filter cartridge, an end cap fixedly connected to the top of the filter cartridge, an oil inlet and an oil outlet opened on the side wall of the filter cartridge, and also includes a filter assembly and a pressure relief assembly arranged in the filter cartridge, wherein the filter cartridge includes an upper shell, a lower shell coaxially connected to the bottom end of the upper shell, and a base coaxially connected to the bottom end of the lower shell, and a throttle valve is arranged on the base. The present application has the effect of making the filter work normally under pressure changes.

Description

Technical Field

[0001] The present application relates to the field of hydraulic system filtering equipment, and in particular to a static pressure transmission filter. Background Art

[0002] The function of the hydraulic system is to increase the force by changing the pressure. A complete hydraulic system consists of five parts, namely power components, actuators, control components, auxiliary components (accessories) and hydraulic oil. Before a system is officially put into use, it is generally necessary to flush it. The purpose of flushing is to remove pollutants, metal chips, fiber compounds, iron cores, etc. that remain in the system. In the first two hours of work, even if the system is not completely damaged, it will cause a series of failures.

[0003] In a closed system, the oil does not return to the tank after work, and the heat dissipation and filtration conditions of the oil are worse than those of an open system. In order to compensate for the leaks in the system, an oil replenishment system is usually set up for oil replenishment and heat dissipation. A filter is installed in the oil replenishment system to improve the reliability and service life of the transmission device. The function of the filter is to filter various impurities in the hydraulic system. The main sources are mechanical impurities that remain in the hydraulic system after cleaning, such as water rust, casting sand, welding slag, iron filings, paint, paint skin and cotton yarn scraps.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there are the following defects: in the oil circuit, as the demand for oil varies, the pressure changes, which can easily cause damage to the filter and pose a safety hazard. Summary of the invention

[0005] In order to enable the filter to work normally under pressure changes, the present application provides a static pressure transmission filter.

[0006] The static pressure transmission filter provided in this application adopts the following technical solution:

[0007] A static pressure transmission filter comprises a filter cartridge, an end cover fixedly connected to the top end of the filter cartridge, an oil inlet and an oil outlet opened on the side wall of the filter cartridge, and also comprises a filter assembly and a pressure relief assembly arranged in the filter cartridge. The filter cartridge comprises an upper shell, a lower shell coaxially connected to the bottom end of the upper shell, and a base coaxially connected to the bottom end of the lower shell, and a throttle valve is provided on the base.

[0008] By adopting the above technical solution, oil enters the upper shell from the oil inlet. When the oil pressure is stable, the oil enters the filter assembly through the oil pipe, and the oil filtered by the filter assembly flows out from the oil outlet. When the oil pressure increases, the pressure relief assembly opens, and the oil enters the oil tank through the throttle valve on the base without being filtered, thereby balancing the pressure, allowing the filter to be used normally, and improving safety.

[0009] Optionally, a horizontal mounting platform is provided in the upper shell body, an oil pipe is coaxially provided in the middle of the mounting platform, the oil pipe connects the upper shell body and the lower shell body, the oil inlet is located above the mounting platform, the oil outlet is located below the mounting platform, and the filter assembly includes a first filter element coaxially arranged in the lower shell body.

[0010] By adopting the above technical solution, the oil enters the upper housing from the oil inlet, flows into the first filter element from the relevant part, is filtered by the first filter element, and goes out from the oil outlet.

[0011] Optionally, the top end of the first filter element is fixed to the outer wall of the oil pipe through an upper connecting cover, and the bottom end is fixed to the base through a lower connecting cover, and a gap is left between the first filter element and the inner wall of the lower shell.

[0012] By adopting the above technical solution, when the oil pressure is stable, the oil enters the first filter element through the oil pipe, the oil filtered by the first filter element enters between the first filter element and the outer shell, and flows out from the oil outlet; when the oil pressure increases, the pressure relief assembly opens, the oil directly enters between the first filter element and the outer shell, and enters the oil tank through the throttle valve on the base.

[0013] Optionally, the first filter element includes an inner net arranged in a cylindrical shape, an outer net coaxially sleeved outside the inner net, and filter material filled between the inner net and the outer net.

[0014] By adopting the above technical solution, the inner net and the outer net reduce the possibility of the filter material shifting during use and affecting normal use.

[0015] Optionally, a mounting port is opened on the mounting platform, and the pressure relief assembly includes a forward one-way valve arranged on the mounting port.

[0016] By adopting the above technical solution, when the oil pressure in the upper shell is too high, the positive check valve opens, and the oil enters between the first filter element and the outer shell from the installation port and enters the oil tank through the throttle valve on the base.

[0017] Optionally, a step is formed on the side wall of the installation port, and the positive one-way valve includes a sealing plug slidably inserted into the installation port and a first spring sleeved on the sealing plug, the top end of the first spring is fixedly connected to the top end of the sealing plug, and the bottom end is fixedly connected to the upper surface of the step, the diameter of the sealing plug gradually increases in the vertical downward direction, and the bottom end of the sealing plug abuts against the step.

[0018] By adopting the above technical solution, when the oil pressure is too large, the first spring is compressed, the sealing plug moves downward, and the oil flows into the lower housing from between the side wall of the installation port and the sealing plug.

[0019] Optionally, an oil drain port is opened in the middle of the base, and a mounting frame is provided at the bottom of the base. The pressure relief assembly includes a pressure relief valve arranged on the mounting frame, a second spring arranged on the mounting frame, and a sealing member arranged between the second spring and the base, and the second spring forces the sealing member to block the oil drain port.

[0020] By adopting the above technical solution, when the oil pressure is too high, the pressure drives the sealing member to compress the second spring, the sealing member is separated from the base, and the oil between the first filter element and the lower shell flows into the oil tank from the gap between the base and the sealing member.

[0021] Optionally, the blocking member includes a top cover abutting against the base, a bottom cover abutting against the second spring, and a second filter element fixedly connected between the top cover and the bottom cover, and a reverse one-way valve is provided on the top cover.

[0022] By adopting the above technical solution, when the pressure changes and oil replenishment is required, the oil in the oil tank is first filtered by the second filter element under the action of pressure, the reverse one-way valve is opened, and the oil flows out from the oil outlet along the gap between the first filter element and the lower shell.

[0023] Optionally, the lower shell is threadedly connected to the base, and thread sealant is coated on the contact surface of the base and the lower shell.

[0024] By adopting the above technical solution, the thread sealant improves the stability of the connection between the lower shell and the base and the sealing between the two.

[0025] Optionally, a first sealing ring is fixedly connected between the upper shell and the lower shell.

[0026] By adopting the above technical solution, the first sealing ring improves the sealing performance between the upper shell and the lower shell.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Set up the filter assembly and pressure relief assembly to make the filter work normally under pressure changes;

[0029] 2. The first filter element includes an inner net, an outer net, and filter material to achieve high-precision filtration of hydraulic oil;

[0030] 3. Thread sealant is provided to improve the stability of the connection between the lower shell and the base and the sealing between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0032] Figure 2 is a cross-sectional view of a filter cartridge used to embody a filter assembly and a pressure relief assembly in an embodiment of the present application;

[0033] Figure 3 is a cross-sectional view used to embody the forward check valve in the embodiment of the present application;

[0034] Figure 4 It is a structural schematic diagram of a base and a mounting frame for a throttle valve in an embodiment of the present application.

[0035] Description of reference numerals: 1. filter cartridge; 11. upper housing; 111. oil inlet; 112. oil outlet; 12. lower housing; 121. second sealing ring; 13. base; 131. supporting plate; 132. oil drain port; 2. end cover; 21. first sealing ring; 3. filter assembly; 31. first filter element; 311. inner net; 312. filter material; 313. outer net; 314. upper connecting cover; 315. lower connecting cover; 4. pressure relief assembly; 41. Forward one-way valve; 411. Sealing plug; 412. First spring; 42. Pressure relief valve; 421. Second spring; 422. Top cover; 423. Second filter element; 424. Bottom cover; One-way valve; 5. Throttle valve; 51. Throttle cover; 52. Throttle hole; 6. Mounting platform; 61. Third sealing ring; 62. Oil pipe; 63. Mounting port; 631. Step; 7. Mounting frame; 71. Vertical frame; 72. Horizontal frame; 721. Boss. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The embodiment of the present application discloses a static pressure transmission filter.

[0038] Reference Figure 1 and Figure 2 The static pressure transmission filter comprises a filter cartridge 1, an end cap 2 fixedly connected to the top of the filter cartridge 1, a filter assembly 3 connected to the filter cartridge 1, and a pressure relief assembly 4. The filter cartridge 1 comprises an upper shell 11, a lower shell 12 coaxially connected to the bottom of the upper shell 11, and a base 13 coaxially connected to the bottom of the lower shell 12, and a throttle valve 5 is provided on the base 13.

[0039] Reference Figure 1 and Figure 2 The end cover 2 is fixedly connected to the top of the upper shell 11, and a first sealing ring 21 is fixedly connected between the end cover 2 and the upper shell 11. The first sealing ring 21 improves the sealing between the end cover 2 and the upper shell 11. A second sealing ring 121 is fixedly connected between the upper shell 11 and the lower shell 12. The first sealing ring 21 improves the sealing between the upper shell 11 and the lower shell 12.

[0040] Reference Figure 1 and Figure 3The side wall of the upper shell 11 is fixedly connected with an oil inlet 111 and an oil outlet 112 which are connected with the upper shell 11. A horizontal mounting platform 6 is fixedly connected with the upper shell 11. A third sealing ring 61 is fixedly connected to the outer side of the mounting platform 6. The third sealing ring 61 is located between the upper shell 11 and the mounting platform 6 to improve the sealing between the upper shell 11 and the mounting platform 6. An oil pipe 62 is formed in the middle of the bottom surface of the mounting platform 6. The oil pipe 62 connects the upper shell 11 and the lower shell 12. The oil inlet 111 is located above the mounting platform 6, and the oil outlet 112 is located below the mounting platform 6. The oil inlet 111 and the oil outlet 112 are staggered.

[0041] Reference Figure 2 and Figure 3 The filter assembly 3 includes a first filter element 31 disposed in the lower housing 12. The first filter element 31 and the oil pipe 62 are coaxially disposed with the lower housing 12. The top end of the first filter element 31 is fixed to the outer wall of the oil pipe 62 through an upper connecting cover 314, and the bottom end is fixed to the base 13 through a lower connecting cover 315.

[0042] Reference Figure 2 The first filter element 31 includes an inner net 311 arranged in a cylindrical shape, an outer net 313 coaxially sleeved outside the inner net 311, and a filter material 312 filled between the inner net 311 and the outer net 313, so as to achieve high-precision filtration of the hydraulic oil. The inner net 311 and the outer net 313 reduce the possibility that the filter material 312 may deviate during use, thereby affecting normal use.

[0043] Reference Figure 1 and Figure 2 , the outer diameter of the first filter element 31 is smaller than the inner diameter of the outer shell, and the oil enters the upper shell 11 from the oil inlet 111. When the oil pressure is stable, the oil enters the first filter element 31 through the oil pipe 62, and the oil filtered by the first filter element 31 enters between the first filter element 31 and the outer shell, and flows out from the oil outlet 112. When the oil pressure increases, the pressure relief assembly 4 opens, and the oil directly enters between the first filter element 31 and the outer shell, and enters the oil tank (not shown in the figure) through the throttle valve 5 on the base 13, balancing the pressure, so that the filter can be used normally and improving safety.

[0044] Reference Figure 2 and Figure 3 The mounting platform 6 is provided with a plurality of mounting ports 63. In this embodiment, two mounting ports 63 are provided, and the two mounting ports 63 are symmetrically arranged about the axis of the oil pipe 62. The pressure relief assembly 4 includes a positive check valve 41 arranged on the mounting port 63, and the positive check valve 41 is arranged one-to-one with the mounting port 63. When the oil pressure in the upper housing 11 is too large, the positive check valve 41 opens, and the oil enters between the first filter element 31 and the outer housing from the mounting port 63, and enters the oil tank through the throttle valve 5 on the base 13.

[0045] Reference Figure 3, an annular step 631 is formed on the side wall of the installation port 63, and the forward one-way valve 41 includes a sealing plug 411 slidably inserted into the installation port 63 and a first spring 412 sleeved on the sealing plug 411. The diameter of the sealing plug 411 gradually increases in the vertical downward direction, and the bottom end of the sealing plug 411 abuts against the step 631. The top end of the first spring 412 is fixedly connected to the top end of the sealing plug 411, and the bottom end is fixedly connected to the upper surface of the step 631. When the oil pressure is too large, the first spring 412 is compressed, the sealing plug 411 moves downward, and the oil flows into the lower housing 12 from between the side wall of the installation port 63 and the sealing plug 411.

[0046] Reference Figure 2 and Figure 4 The lower shell 12 is threadedly connected to the base 13, and thread sealant is applied to the outer wall of the base 13 that contacts the lower shell 12 to fix it, so as to improve the stability of the connection between the lower shell 12 and the base 13 and the sealing between the two. A horizontal supporting sheet 131 is formed at the top of the base 13, and four supporting sheets 131 are evenly arranged along the circumference of the base 13. The supporting sheet 131 is located on the inner side of the base 13, and the supporting sheet 131 abuts against the lower connection cover.

[0047] Reference Figure 2 and Figure 4 The oil between the first filter element 31 and the lower housing 12 flows into the base 13 along the gap between the supporting plates 131. The throttle valve 5 is arranged on the base 13. The oil enters the oil tank through the throttle valve 5 to adjust the pressure in the filter cartridge 1. The throttle valve 5 limits the flow rate of the oil entering the oil tank. When the oil pressure is too high, the pressure relief speed is slow. A pressure relief valve 42 is arranged at the bottom of the base 13.

[0048] Reference Figure 2 and Figure 4 An oil drain port 132 is provided in the middle of the base 13, and a mounting frame 7 is provided at the bottom of the base 13. The mounting frame 7 includes a vertical stand 71 fixedly connected to the base 13 and a horizontal frame 72 fixedly connected to the bottom end of the stand 71. Two stands 71 ​​are symmetrically arranged about the axis center of the base 13, and the horizontal frame 72 is located between the two stands 71. The middle part of the upper surface of the horizontal frame 72 protrudes upward to form a boss 721, and a through hole is provided in the middle part of the boss 721. The pressure relief valve 42 includes a second spring 421 vertically sleeved on the boss 721, and a sealing member arranged between the second spring 421 and the base 13. Under the action of the second spring 421, the sealing member is pressed against the base 13, and the sealing member blocks the oil drain port 132.

[0049] Reference Figure 2 and Figure 4, when the pressure is too large, the blocking member compresses the second spring 421, the blocking member is separated from the base 13, and the oil between the first filter element 31 and the lower housing 12 flows into the oil tank from the gap between the base 13 and the blocking member. The blocking member includes a top cover 422 abutting against the base 13, a bottom cover abutting against the second spring 421, and a second filter element 423 fixedly connected between the top cover 422 and the bottom cover 424. The top cover 422 is arranged in an annular shape, and the throttle valve 5 includes a throttle cover 51 connected to the top cover 422, and a throttle hole 52 is opened on the throttle cover 51, and the throttle hole 52 has a small diameter.

[0050] Refer to Tu 1 and Figure 2 A reverse check valve 43 is provided on the throttle cover 51. When the pressure changes and oil needs to be replenished, the oil in the oil tank is filtered by the second filter element 423 under the action of pressure, and the reverse check valve 43 is opened, and the oil flows out from the oil outlet 112 along the gap between the first filter element 31 and the lower housing 12. The reverse check valve 43 has the same structure as the forward check valve 41, but is installed in the opposite position.

[0051] The implementation principle of a static pressure transmission filter in the embodiment of the present application is as follows: oil enters the upper housing 11 from the oil inlet 111. When the oil pressure is stable, the oil enters the first filter element 31 through the oil pipe 62, and the oil filtered by the first filter element 31 enters between the first filter element 31 and the outer housing, and flows out from the oil outlet 112. When the oil pressure in the upper housing 11 is too high, the positive check valve 41 opens, and the oil enters between the first filter element 31 and the outer housing from the mounting port 63, and enters the oil tank through the throttle valve 5 on the base 13. The oil between the first filter element 31 and the lower housing 12 flows into the base 13 along the gap between the supporting plate 131. The throttle valve 5 is set in the middle of the base 13. The oil enters the oil tank through the throttle valve 5 to adjust the pressure in the filter cartridge 1.

[0052] When the oil pressure is too high, the pressure drives the plugging member to compress the second spring 421, the plugging member is separated from the base 13, and the oil between the first filter element 31 and the lower housing 12 flows into the oil tank from the gap between the base 13 and the plugging member. When the pressure changes and oil needs to be replenished, the oil in the oil tank is first filtered by the second filter element 423 under the action of pressure, opens the reverse check valve 43, and flows out from the oil outlet 112 along the gap between the first filter element 31 and the lower housing 12.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A static pressure transmission filter, comprising a filter cartridge (1), an end cap (2) fixedly connected to the top of the filter cartridge (1), an oil inlet (111) and an oil outlet (112) provided on the side wall of the filter cartridge (1), characterized in that: It also includes a filter assembly (3) and a pressure relief assembly (4) arranged in the filter cartridge (1); the filter cartridge (1) includes an upper shell (11), a lower shell (12) coaxially connected to the bottom end of the upper shell (11), and a base (13) coaxially connected to the bottom end of the lower shell (12); a throttle valve (5) is provided on the base (13); A horizontal mounting platform (6) is provided in the upper housing (11); an oil pipe (62) is coaxially provided in the middle of the mounting platform (6); the oil pipe (62) communicates with the upper housing (11) and the lower housing (12); the oil inlet (111) is located above the mounting platform (6); the oil outlet (112) is located below the mounting platform (6); the filter assembly (3) comprises a first filter element (31) coaxially arranged in the lower housing (12); the first filter element (31) 1) is fixed to the outer wall of the oil pipe (62) at its top end through an upper connecting cover (314), and is fixed to the base (13) at its bottom end through a lower connecting cover (315), a gap being left between the first filter element (31) and the inner wall of the lower housing (12); the first filter element (31) comprises an inner net (311) arranged in a cylindrical shape, an outer net (313) coaxially sleeved outside the inner net (311), and filter material (312) filled between the inner net (311) and the outer net (313); An oil drain port (132) is provided in the middle of the base (13); a mounting frame (7) is provided at the bottom of the base (13); the pressure relief assembly (4) comprises a pressure relief valve (42) arranged on the mounting frame (7); a second spring (421) arranged on the mounting frame (7); and a blocking member arranged between the second spring (421) and the base (13); the second spring (421) forces the blocking member to block the oil drain port (132); the blocking member comprises a top cover (422) abutting against the base (13); a bottom cover (424) abutting against the second spring (421); and a second filter element (423) fixedly connected between the top cover (422) and the bottom cover (424); and a reverse check valve (43) is provided on the top cover (422); The mounting platform (6) is provided with a mounting opening (63), and the pressure relief assembly (4) comprises a forward check valve (41) arranged on the mounting opening (63); a step (631) is formed on the side wall of the mounting opening (63), and the forward check valve (41) comprises a sealing plug (411) slidably arranged in the mounting opening (63), and a first spring (412) sleeved on the sealing plug (411), the top end of the first spring (412) is fixedly connected to the top end of the sealing plug (411), and the bottom end is fixedly connected to the upper surface of the step (631), the diameter of the sealing plug (411) gradually increases in a vertical downward direction, and the bottom end of the sealing plug (411) abuts against the step (631); A first sealing ring (21) is fixedly connected between the upper shell (11) and the end cover (2); a second sealing ring (121) is fixedly connected between the upper shell (11) and the lower shell (12); and a third sealing ring (61) is fixedly connected to the outer side of the mounting platform (6), and the third sealing ring (61) is located between the upper shell (11) and the mounting platform (6).

2. The static pressure transmission filter according to claim 1, characterized in that: The lower shell (12) is threadedly connected to the base (13), and thread sealant is applied on the contact surface of the base (13) and the lower shell (12).

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