A non-stop passive automatic filter element switching filter

Abstract

The present invention discloses a non-stop passive automatic switching filter element filter, comprising an upper shell, a lower shell, a filter element status indicator, an outlet one-way valve assembly, a one-way valve, a main valve, an inlet pipe joint, an outlet pipe joint, a switching valve, a bypass valve assembly and a filter element. The upper shell and the lower shell are fixed by threaded connection, and the upper shell is provided with an outlet pipe joint and an inlet pipe joint. The filter element status indicator, the outlet one-way valve assembly, the one-way valve, the main valve, the switching valve and the bypass valve assembly are respectively mounted on the upper shell, and the filter element is arranged in the lower shell. The inlet pipe joint is connected with the main valve, the filter element, the outlet one-way valve assembly and the outlet pipe joint in sequence to form a filtering circuit. The filtering circuit is provided with two and is arranged in a parallel direction. The filter element can be passively and automatically switched, and the system can be replaced with the filter element without stopping the system, which effectively solves the problem that the system needs to be shut down for maintenance and meets the demand for continuous operation of the system.

Description

Technical Field

[0001] The invention relates to the technical field of filter element switching, in particular to a non-stop passive automatic filter element switching filter. Background Art

[0002] At present, domestic and foreign aviation and ship fuel systems need to be shut down to clean and replace filter elements after a period of work. The preparation work required for restarting the system after shutdown is long, and the time cost and fuel cost are high. At present, domestic and foreign filters are mainly single-chamber filters, manually switched multi-chamber filters, and electrically controlled multi-chamber filters. When replacing the filter element of a single-chamber filter, the machine must be shut down to replace it, which cannot meet the continuous working requirements of the system; the manual switching of multi-chamber filters requires ground staff to monitor the working status of the filter in real time. When the filter element is blocked, it needs to be switched manually, which has high labor costs and cannot be used in environments with relatively harsh environmental conditions; the electrically controlled multi-chamber filter requires the arrangement of electrical components and power supply lines. The electrical components are prone to heat and are easily affected by electromagnetic interference, which may cause failures and have low reliability. For this reason, a non-stop passive automatic switching filter element filter is required, which can be installed in aviation and ship gas turbine systems with relatively harsh working environments to realize passive automatic switching of filter elements, meet the requirements of non-stop replacement of filter elements, and realize continuous working of the system. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a non-stop passive automatic switching filter element filter, which can realize passive automatic switching of filter elements and meet the need for replacing filter elements without stopping the system, effectively solving the problem that the system needs to be shut down for maintenance, meeting the need for continuous operation of the system, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a non-stop passive automatic switching filter element filter, comprising an upper shell, a lower shell, a filter element status indicator, an outlet check valve assembly, a check valve, a main valve, an inlet pipe joint, an outlet pipe joint, a switching valve, a bypass valve assembly and a filter element, the upper shell and the lower shell are fixed by threaded connection, the upper shell is provided with an outlet pipe joint and an inlet pipe joint, the filter element status indicator, the outlet check valve assembly, the check valve, the main valve, the switching valve and the bypass valve assembly are respectively installed on the upper shell, and the filter element is provided with a It is placed in the lower shell, and the inlet pipe joint is connected with the main valve, the filter element, the outlet check valve assembly and the outlet pipe joint in sequence to form a filtering circuit. The filtering circuit is provided with two and is arranged in parallel. The indicating chamber pressure of the filter element status indicator is respectively connected with the high-pressure chamber and the low-pressure chamber of the filter element. The switching valve is respectively connected with the main valve. The bypass valve assembly is arranged on the oil path between the outlet pipe joint and the inlet pipe joint. The check valve is arranged between the switching valve and the high-pressure chamber of the filter element. The main valve, the check valve and the outlet check valve assembly together constitute the self-sealing valve of the filter element.

[0005] Further, the filter element status indicator includes a filter element status indicator A and a filter element status indicator B, the outlet check valve assembly includes an outlet check valve assembly A and an outlet check valve assembly B, the check valve includes a check valve A and a check valve B, the main valve includes a main valve A and a main valve B, the filter element includes a filter element A and a filter element B, the inlet pipe joint, the main valve A, the filter element A, the outlet check valve assembly A and the outlet pipe joint are connected in sequence, the inlet pipe joint, the main valve B, the filter element B, the outlet check valve assembly B and the outlet pipe joint are connected in sequence, the check valve A is arranged between the switching valve and the high-pressure chamber of the filter element A, the check valve B is arranged between the switching valve and the high-pressure chamber of the filter element B, the filter element status indicator A indicates that the chamber pressure is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element A, and the filter element status indicator B indicates that the chamber pressure is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element A.

[0006] Furthermore, the switching valve includes a plug 2, a switching valve housing, a valve body, a magnet 5 and a magnet 6. The valve body is arranged in the switching valve housing. Magnets 5 and 6 are respectively arranged on both sides of the valve body. Plugs 2 are respectively arranged at both ends of the switching valve housing. Magnets 5 and 6 are respectively fixed on the plug 2. A sealing ring 6 is arranged between the plug 2 and the switching valve housing. Pressure-sensing holes 1, 2, 3, 4 and 5 are arranged on the switching valve housing, and sealing rings 7 are respectively arranged at the openings of the pressure-sensing holes 1, 2, 3, 4 and 5.

[0007] Furthermore, two lower shells are provided, filter element A and filter element B are the same and are respectively installed in the lower shells, the bottom of the lower shell is threadedly connected with an oil drain screw, the inlet pipe joint is threadedly connected to the upper shell, and a sealing ring 1 is provided between the inlet pipe joint and the upper shell, the outlet pipe joint is threadedly connected to the upper shell, and a sealing ring 2 is provided between the outlet pipe joint and the upper shell.

[0008] Furthermore, the filter element status indicator includes a plug 1, a piston 1, a spring 1, an indicator cap 1, a protective cap, a permanent magnet 1, a permanent magnet 2, an indicator housing, a spring 2, a piston 2, a small spring and an indicator cap 2. The piston 1 is arranged in the indicator housing, the spring 1 is arranged between the piston 1 and the bottom wall of the indicator housing, the piston 2 is arranged in the center hole of the piston 1, the spring 2 is arranged between the piston 2 and the bottom of the center hole of the piston 1, the plug 1 is threadedly connected to the indicator housing, and the indicator cap 2 is installed in the plug 1 through a hole retaining ring and a lower retaining ring. A small spring is arranged between the indicating cap 2 and the plug 1, a permanent magnet 3 is arranged on the inner side of the lower end of the indicating cap 2, the upper end of the piston 2 passes through the plug 1, a 420 permanent magnet 4 is arranged on the upper end of the piston 2, a protective cap is arranged on the lower end of the indicating shell, a gasket and a shaft retaining ring are arranged on the lower end of the indicating shell, an indicating cap 1 is arranged in the protective cap, a permanent magnet 1 is arranged on the inner side of the indicating cap 1, the lower end of the piston 1 passes through the center hole of the indicating shell, a permanent magnet 2 is arranged on the lower end of the piston 1, and the indicating cap 2 provides installation support for the permanent magnet 3.

[0009] Furthermore, indicator cap 1 and indicator cap 2 have three colors of green, orange and red respectively. The three indicator colors, green, orange and red, correspond to three working states of the filter element respectively, green - normal working, orange - not working, red - blocked.

[0010] Furthermore, a filter element high-pressure chamber interface and a filter element low-pressure chamber interface are provided on the indicating housing, and sealing rings three are respectively provided at the interfaces of the filter element high-pressure chamber interface and the filter element low-pressure chamber interface. The filter element high-pressure chamber interface is connected with the high-pressure chamber of the filter element, and the filter element low-pressure chamber interface is connected with the low-pressure chamber of the filter element. A sealing ring five is provided between the plug one and the indicating housing, a sealing ring four is provided between the piston one and the indicating housing, and a protective ring is provided on the outside of the sealing ring four.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The filter has high integration and novel structural layout. Combined with the monk space, it can realize passive automatic switching of filter elements, allowing the system to replace filter elements without stopping. It effectively solves the problem of system shutdown for maintenance and meets the needs of continuous system operation. At the same time, it improves system working time and reduces shutdown maintenance costs. The system can work permanently without shutdown, which has great advantages over ordinary filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an axonometric view of the appearance of the present invention;

[0014] Figure 2 This is a schematic diagram of the oil circuit structure of the switching valve of the present invention;

[0015] Figure 3 This is a schematic diagram of the main valve oil circuit structure of the present invention;

[0016] Figure 4 This is a schematic diagram of the bypass valve oil circuit structure of the present invention;

[0017] Figure 5 This is a schematic diagram of the structure of the filter element status indicator of the present invention;

[0018] Figure 6 This is a schematic diagram of the switching valve structure of the present invention;

[0019] Figure 7 It is a schematic diagram of the system principle of the present invention.

[0020] In the figure: 1 upper housing, 2 lower housing, 3 drain screw, 4 filter element status indicator, 5 outlet check valve assembly, 7 check valve, 8 main valve, 9 inlet pipe joint, 10 sealing ring 1, 12 sealing ring 2, 13 outlet pipe joint, 14 main valve A, 15 filter element A, 16 filter element status indicator A, 17 check valve A, 18 outlet check valve assembly A, 19 switching valve, 20 check valve B, 21 outlet check valve assembly B, 22 filter element status indicator B, 23 filter element B, 24 main valve B, 25 bypass valve assembly, 401 plug 1, 402 hole retaining ring, 403 lower retaining ring, 404 sealing ring 3, 405 piston 1, 406 protection ring, 407 spring 1, 408 Indicator cap one, 409 protection cap, 410 gasket, 411 shaft retaining ring, 412 permanent magnet one, 413 permanent magnet two, 414 indicator housing, 415 spring two, 416 sealing ring four, 417 piston two, 418 sealing ring five, 419 permanent magnet three, 420 permanent magnet four, 421 small spring, 422 indicator cap two, 601 plug two, 602 switching valve housing, 603 valve body, 604 magnet five, 605 sealing ring six, 606 sealing ring seven, 607 magnet six, 100 filter element high pressure cavity interface, 200 filter element low pressure cavity interface, 300 pressure sensing hole one, 400 pressure sensing hole two, 500 pressure sensing hole three, 600 pressure sensing hole four, 700 pressure sensing hole five. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] See also Figure 1-7The present invention provides a technical solution: a non-stop passive automatic switching filter element filter, comprising an upper shell 1, a lower shell 2, a filter element state indicator 4, an outlet check valve assembly 5, a check valve 7, a main valve 8, an inlet pipe joint 9, an outlet pipe joint 13, a switching valve 19, a bypass valve assembly 25 and a filter element, the upper shell 1 and the lower shell 2 are fixed by threaded connection, the upper shell 1 is provided with an outlet pipe joint 13 and an inlet pipe joint 9, the filter element state indicator 4, the outlet check valve assembly 5, the check valve 7, the main valve 8, the switching valve 19 and the bypass valve assembly 25 are respectively installed on the upper shell 1, the filter element is arranged in the lower shell 2, the inlet pipe joint 9 is sequentially connected with the main valve 8, the filter element, the outlet check valve assembly 5 and the outlet pipe joint 13 to form a filtering circuit, and the filter element The circuits are set to be two and are set in parallel. The indicating chamber pressure of the filter element status indicator 4 is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element. The switching valve 19 is respectively connected to the main valve 8. The switching valve 19 can automatically switch the on / off of the main valve 8 according to the filter element pressure difference without external control, thereby realizing automatic switching of the oil circuit without the need for personnel control or electrical component control. The bypass valve assembly 25 is arranged on the oil circuit between the outlet pipe joint 13 and the inlet pipe joint 9, and the one-way valve 7 is arranged between the switching valve 19 and the high-pressure chamber of the filter element. The main valve 8, the one-way valve 7, and the outlet one-way valve assembly 5 together constitute a self-sealing valve of the filter element. Through this structure, the system oil can be prevented from being connected to the external environment when the filter element is replaced, and the oil can be prevented from bypassing when the filter element is replaced, so that the filter element can be replaced without stopping the machine.

[0023] The filter element status indicator 4 includes a filter element status indicator A16 and a filter element status indicator B22, the outlet check valve assembly 5 includes an outlet check valve assembly A18 and an outlet check valve assembly B21, the check valve 7 includes a check valve A17 and a check valve B20, the main valve 8 includes a main valve A14 and a main valve B24, the filter element includes a filter element A15 and a filter element B23, the inlet pipe joint 9, the main valve A14, the filter element A15, the outlet check valve assembly A18 and the outlet pipe joint 13 are connected in sequence, the inlet pipe joint 9, the main valve B24, the filter element B23, the outlet check valve assembly B21 and the outlet pipe joint 13 are connected in sequence, the check valve A17 is arranged between the switching valve 19 and the high-pressure chamber of the filter element A15, and the check valve B20 is arranged A throttle valve is arranged between the switching valve 19 and the high-pressure chamber of the filter element B23, between the low-pressure chamber of the filter element A15, between the low-pressure chamber of the filter element B23 and the switching valve 19. The throttle valve is of conventional hydraulic design and will not be described in detail here. The filter element status indicator A16 indicates that the chamber pressure is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element A15, and is used to monitor the pressure difference of the filter element A15. The filter element status indicator B22 indicates that the chamber pressure is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element A15, and is used to monitor the pressure difference of the filter element B23. The pressure-sensing holes of the switching valve 19 are respectively connected to the high-pressure chamber of the filter element A15 and the low-pressure chamber of the filter element B23. The pressure-sensing holes of the switching valve 19 are respectively connected to the low-pressure chamber of the filter element A15 and the high-pressure chamber of the filter element B23.

[0024] The switching valve 19 includes a second plug 601, a switching valve housing 602, a valve body 603, a fifth magnet 604 and a sixth magnet 607. The valve body 603 is arranged in the switching valve housing 602. The fifth magnet 604 and the sixth magnet 607 are arranged on both sides of the valve body 603. The second plug 601 is arranged at both ends of the switching valve housing 602. The fifth magnet 604 and the sixth magnet 607 are fixed on the second plug 601 respectively. The second plug 601 and the switching valve housing 602 are connected to each other. 02, a sealing ring 605 is arranged between the main valve A14 and the main valve B24, and a pressure sensing hole 1 300, a pressure sensing hole 2 400, a pressure sensing hole 3 500, a pressure sensing hole 4 600 and a pressure sensing hole 5 700 are arranged on the switching valve housing 602, and a sealing ring 7 606 is arranged at the orifices of the pressure sensing hole 1 300, the pressure sensing hole 2 400, the pressure sensing hole 3 500, the pressure sensing hole 4 600 and the pressure sensing hole 5 700, respectively. The switching valve 19 is used to control the opening / closing of the main valve A14 and the main valve B24, as shown in the attached figure. Figure 6 As shown, when the valve body 603 is located on the left side, the pressure-sensing hole 2 400 is connected to the pressure-sensing hole 3 500, at this time the main valve A14 is opened, the main valve B24 is closed, and the oil is filtered through the filter element A15; when the valve body 603 is located on the right side, the pressure-sensing hole 4 600 is connected to the pressure-sensing hole 3 500, at this time the main valve B24 is opened, the main valve A14 is closed, and the oil is filtered through the filter element B23; the pressure-sensing hole 1 300 of the switching valve 19 is connected to the high-pressure chamber of the filter element A15 and the low-pressure chamber of the filter element B23 respectively. When the valve body 603 is on the left, the main valve A14 is opened and the main valve B24 is closed. At this time, there is no oil flowing in the filter element B23. The high-pressure cavity and low-pressure cavity of the filter element B23 are both closed cavities. Therefore, at this time, the pressure-sensing hole 1300 of the switching valve 19 is connected to the high-pressure cavity of the filter element A15, and the pressure-sensing hole 5700 of the switching valve 19 is connected to the low-pressure cavity of the filter element A15. On the contrary, when the valve body 603 is on the left, the main valve A14 is opened and the main valve B24 is closed. At this time, there is no oil flowing in the filter element B23. The high-pressure cavity and the low-pressure cavity of the filter element B23 are both closed cavities. Therefore, at this time, the pressure-sensing hole 1300 of the switching valve 19 is connected to the high-pressure cavity of the filter element A15, and the pressure-sensing hole 5700 of the switching valve 19 is connected to the low-pressure cavity of the filter element A15. When it is on the right side, the main valve A14 is closed and the main valve B24 is opened. At this time, there is no oil flowing in the filter element A15. The high-pressure cavity and the low-pressure cavity of the filter element A15 are both closed cavities. Therefore, at this time, the pressure-sensing hole 1300 of the switching valve 19 is connected with the low-pressure cavity of the filter element B23, and the pressure-sensing hole 5700 of the switching valve 19 is connected with the high-pressure cavity of the filter element B23. To avoid replacing the filter element B23, the valve body 603 is on the left side at this time, the main valve A14 is opened, the main valve B24 is closed, and the pressure-sensing hole 5700 of the switching valve 19 is connected. The low-pressure chamber of filter element A15 is connected, and the high-pressure chamber of filter element B23 is connected. Due to the removal of the lower shell 2, the state of "both the high-pressure chamber and the low-pressure chamber of filter element B23 are closed chambers" is changed. At this time, the pressure-sensing hole 700 of the switching valve 19 may be connected to the external environment, resulting in pressure loss, which in turn causes the valve body 603 to move to the right, causing the main valve B to open, causing the oil to flow from the filter element B23 chamber to the external environment. The one-way valve 7 set between the switching valve 19 and the high-pressure chamber of the filter element can effectively solve this problem.

[0025] The lower housing 2 is provided with two, the filter element A15 and the filter element B23 are the same and are respectively installed in the lower housing 2, the bottom of the lower housing 2 is connected with a drain screw 3 through a thread, and the drain screw 3 is loosened to discharge the oil in the filter element cavity, the inlet pipe joint 9 is connected with the upper housing 1 through a thread, and a sealing ring 10 is arranged between the inlet pipe joint 9 and the upper housing 1, the outlet pipe joint 13 is connected with the upper housing 1 through a thread, and a sealing ring 2 12 is arranged between the outlet pipe joint 13 and the upper housing 1.

[0026] The filter element status indicator 4 includes a plug 401, a piston 405, a spring 407, an indicator cap 408, a protective cap 409, a permanent magnet 412, a permanent magnet 413, an indicator housing 414, a spring 415, a piston 417, a small spring 421 and an indicator cap 422. The piston 405 is arranged in the indicator housing 414, the spring 407 is arranged between the piston 405 and the bottom wall of the indicator housing 414, the piston 417 is arranged in the center hole of the piston 405, the spring 415 is arranged between the piston 417 and the bottom of the center hole of the piston 405, the plug 401 is threadedly connected to the indicator housing 414, the indicator cap 422 is installed in the plug 401 through the hole retaining ring 402 and the lower retaining ring 403, a small spring 421 is arranged between the indicator cap 422 and the plug 401, and a lower end of the indicator cap 422 is provided with a lower spring 421. A permanent magnet 3 419 is arranged, the upper end of the piston 2 417 is passed through the plug 1 401, and a permanent magnet 420 is arranged on the upper end of the piston 2 417. The plug 1 401 provides installation support for the hole retaining ring 402, the lower retaining ring 403, and the indicating cap 2 422; the indicating cap 1 408 provides installation support for the piston 1 405, and a protective cap 409 is arranged on the lower end of the indicating housing 414, and a gasket is arranged on the lower end of the indicating housing 414. 410 and a shaft retaining ring 411, the lower end of the indicating shell 414 is limited by the gasket 410 and the shaft retaining ring 411, an indicating cap 1 408 is arranged in the protective cap 409, a permanent magnet 1 412 is arranged on the inner side of the indicating cap 1 408, the lower end of the piston 1 405 passes through the center hole of the indicating shell 414, a permanent magnet 2 413 is arranged on the lower end of the piston 1 405, and the indicating cap 2 422 provides installation support for the permanent magnet 3 419.

[0027] The indicator cap 1 408 and the indicator cap 2 422 are respectively green, orange and red. The three indicator colors, green, orange and red, correspond to the three working states of the filter element, green - normal working, orange - not working, red - blocked. When the filter is working normally, the switching valve 19 opens the main valve A14. At this time, the system oil is filtered by the filter element A15, and no oil passes through the filter element B23. At this time, the filter element high pressure chamber interface 100 and the filter element low pressure chamber interface 200 of the filter element status indicator A16 are closed. The pressure difference is the filter element pressure difference, which drives piston 1 405 to overcome the elastic force of spring 1 407 and move downward. Under the magnetic force of permanent magnet 1 412 and permanent magnet 2 413, indicating cap 1 408 moves upward. At this time, indicating cap 1 408 is displayed in green. With the increase of working time, the solid impurities intercepted by filter element A15 gradually increase, and the pressure difference of filter element A15 gradually increases. When the pressure difference of filter element A15 increases to the specified value, the hydraulic pressure drives piston 2 417 to overcome spring 2 415 and move downward. Under the magnetic force of permanent magnet three 419 and permanent magnet four 420, indicator cap two 422 moves upward. At this time, indicator cap two 422 is displayed in red, prompting ground staff to replace filter element A15. At this time, switching valve 19 opens main valve B24, main valve A14 is closed, no oil passes through filter element A15, and there is no pressure difference between the high-pressure chamber and the low-pressure chamber of filter element A15. At this time, piston one 405 moves upward under the elastic force of spring one 407. Under the magnetic force of permanent magnet one 412 and permanent magnet two 413, The indicator cap 408 moves downward, and the indicator cap 408 is displayed in orange. The piston 417 moves upward under the elastic force of the spring 415, and the indicator cap 422 is still displayed in red under the elastic force of the small spring 421. The filter element status indicator corresponds to three maintenance states of the filter element: green—the filter element is working and does not require maintenance; orange—the filter element is not working and does not require maintenance; green and red are displayed at the same time—the filter element is blocked and does not need to be replaced for the time being; red and orange are displayed at the same time—the filter element is blocked and needs to be replaced.

[0028] A filter element high-pressure chamber interface 100 and a filter element low-pressure chamber interface 200 are provided on the indicator housing 414, and sealing rings 3 404 are respectively provided at the interfaces of the filter element high-pressure chamber interface 100 and the filter element low-pressure chamber interface 200. The filter element high-pressure chamber interface 100 is connected with the high-pressure chamber of the filter element, and the filter element low-pressure chamber interface 200 is connected with the low-pressure chamber of the filter element. A sealing ring 5 418 is provided between the plug 1 401 and the indicator housing 414, a sealing ring 416 is provided between the piston 1 405 and the indicator housing 414, and a protective ring 406 is provided on the outside of the sealing ring 416.

[0029] In use: When the filter is working normally, the system oil enters the filter from the inlet pipe joint 9. At this time, the valve body 603 of the switching valve 19 is located on the left, the pressure-sensing hole 2 400 is connected to the pressure-sensing hole 3 500, the main valve A14 is opened, and the oil flows out through the filter element A15 and the outlet check valve assembly A18 through the outlet pipe joint 13. The filter element status indicator A16 displays green, the main valve B24 is closed, and there is no oil flowing through the filter element B23. The filter element status indicator B22 displays orange; as the working time increases, the flow resistance of the filter element A15 gradually increases. When the filter element A15 is blocked, the filter element status indicator A16 displays green and red. At this time, the valve body 603 of the switching valve 19 moves to the right. When the valve body 603 is on the right side , the pressure-sensing hole 2 400 and the pressure-sensing hole 3 500 are disconnected, the pressure-sensing hole 3 500 and the pressure-sensing hole 4 600 are connected, the main valve A14 is gradually closed, the main valve B24 is opened, and the oil supply route of the filter is switched from the filter element A15 to the filter element B23. At this time, the filter element status indicator A16 displays orange and red, and the filter element status indicator B22 displays green; at this time, the ground staff loosens the drain screw 3, discharges the oil in the filter element A15 cavity, unscrews the lower housing 2 to replace the filter element A15, and manually presses the red indicator cap of the filter element status indicator A16 to reset it. At this time, the filter element status indicator A16 displays orange, and the filter switches between the filter element A15 and the filter element B23 in turn, realizing the replacement of the filter element without stopping the system, and the system can work permanently without stopping.

[0030] The basic principles, main features and advantages of the present invention are shown and described above. Without departing from the spirit and scope of the present invention, the present invention may also be subject to various changes and improvements, which all fall within the scope of the present invention to be protected.

Claims

1. A non-stop passive automatic filter element switchable filter, comprising an upper housing (1), a lower housing (2), a filter element status indicator (4), an outlet check valve assembly (5), a check valve (7), a main valve (8), an inlet pipe joint (9), an outlet pipe joint (13), a switching valve (19), a bypass valve assembly (25) and a filter element, characterized in that: The upper housing (1) and the lower housing (2) are fixed by threaded connection. The upper housing (1) is provided with an outlet pipe joint (13) and an inlet pipe joint (9). The filter element status indicator (4), the outlet check valve assembly (5), the check valve (7), the main valve (8), the switching valve (19) and the bypass valve assembly (25) are respectively mounted on the upper housing (1). The filter element is arranged in the lower housing (2). The inlet pipe joint (9) is sequentially connected to the main valve (8), the filter element, the outlet check valve assembly (5) and the outlet pipe joint (13) to form a filter circuit. The filter circuit is provided with two and arranged in parallel. The indicating chamber pressure of the filter element status indicator (4) is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element. The switching chamber (25) is connected to the high-pressure chamber and the low-pressure chamber of the filter element. The valves (19) are connected to the main valve (8), respectively. The bypass valve assembly (25) is arranged on the oil path between the outlet pipe joint (13) and the inlet pipe joint (9). The check valve (7) is arranged between the switching valve (19) and the high-pressure chamber of the filter element. The main valve (8), the check valve (7) and the outlet check valve assembly (5) together constitute a self-sealing valve of the filter element. The filter element status indicator (4) includes a filter element status indicator A (16) and a filter element status indicator B (22). The outlet check valve assembly (5) includes an outlet check valve assembly A (18) and an outlet check valve assembly B (21). The check valve (7) includes a check valve A (17) and a check valve B (20). The main valve (8) includes a main valve A (14) and a main valve B (22). 4), the filter element comprises a filter element A (15) and a filter element B (23), the inlet pipe joint (9), the main valve A (14), the filter element A (15), the outlet check valve assembly A (18) and the outlet pipe joint (13) are connected in sequence, the inlet pipe joint (9), the main valve B (24), the filter element B (23), the outlet check valve assembly B (21) and the outlet pipe joint (13) are connected in sequence, the check valve A (17) is arranged between the switching valve (19) and the high pressure chamber of the filter element A (15), the check valve B (20) is arranged between the switching valve (19) and the high pressure chamber of the filter element B (23), the filter element status indicator A (16) indicates the chamber pressure respectively connected to the high pressure chamber and the low pressure chamber of the filter element A (15), and the filter element status indicator The indicating chamber pressure of the indicator B (22) is respectively connected to the high-pressure chamber and the low-pressure chamber of the filter element A (15). The switching valve (19) comprises a second plug (601), a switching valve housing (602), a valve body (603), a fifth magnet (604) and a sixth magnet (607). The valve body (603) is arranged in the switching valve housing (602). The fifth magnet (604) and the sixth magnet (607) are respectively arranged on both sides of the valve body (603). The second plug (601) is respectively arranged at both ends of the switching valve housing (602). The fifth magnet (604) and the sixth magnet (607) are respectively fixed on the second plug (601). A sixth sealing ring (605) is arranged between the second plug (601) and the switching valve housing (602).The switching valve housing (602) is provided with a pressure-sensing hole 1 (300), a pressure-sensing hole 2 (400), a pressure-sensing hole 3 (500), a pressure-sensing hole 4 (600) and a pressure-sensing hole 5 (700), and the openings of the pressure-sensing hole 1 (300), the pressure-sensing hole 2 (400), the pressure-sensing hole 3 (500), the pressure-sensing hole 4 (600) and the pressure-sensing hole 5 (700) are respectively provided with a sealing ring 7 (606). When the valve body (603) is located on the left side, the pressure-sensing hole 2 (400) is communicated with the pressure-sensing hole 3 (500), and at this time, the main valve A (14) is opened and the main valve B (24) is closed; when the valve body (603) is located on the right side, the pressure-sensing hole 4 (600) is communicated with the pressure-sensing hole 3 (500), and at this time, the main valve B (24) is opened and the main valve A (14) is closed. The pressure-sensing hole 1 (300) of the switching valve (19) is respectively connected to the high-pressure chamber of the filter element A (15) and the low-pressure chamber of the filter element B (23); the pressure-sensing hole 5 (700) of the switching valve (19) is respectively connected to the low-pressure chamber of the filter element A (15) and the high-pressure chamber of the filter element B (23); the filter element status indicator (4) comprises a plug 1 (401), a piston 1 (405), a spring 1 (407), an indicator cap 1 (408), a protective cap (409), a permanent magnet 1 (412), a permanent magnet 2 (413), an indicator housing (414), a spring 2 (415), a piston 2 (417), a small spring (421) and an indicator cap 2 (422); the piston 1 (405) is arranged in the indicator housing (414); the spring 1 (407) is arranged The piston (405) is disposed between the first piston (405) and the bottom wall of the indicating housing (414), the second piston (417) is disposed in the center hole of the first piston (405), the second spring (415) is disposed between the second piston (417) and the bottom of the center hole of the first piston (405), the first plug (401) is threadedly connected to the indicating housing (414), the second indicating cap (422) is installed in the first plug (401) through the hole retaining ring (402) and the lower retaining ring (403), a small spring (421) is disposed between the second indicating cap (422) and the first plug (401), a permanent magnet (419) is disposed on the inner side of the lower end of the second indicating cap (422), the upper end of the second piston (417) is passed through the first plug (401), and the upper end of the second piston (417) is provided with a spring (421). 0 permanent magnet four (420), a protective cap (409) is provided at the lower end of the indicating housing (414), a gasket (410) and a shaft retaining ring (411) are provided at the lower end of the indicating housing (414), an indicating cap one (408) is provided in the protective cap (409), a permanent magnet one (412) is provided on the inner side of the indicating cap one (408), the lower end of the piston one (405) is passed through the central hole of the indicating housing (414), a permanent magnet two (413) is provided at the lower end of the piston one (405), a filter element high pressure chamber interface (100) and a filter element low pressure chamber interface (200) are provided on the indicating housing (414), and sealing rings three (404) are provided at the interfaces of the filter element high pressure chamber interface (100) and the filter element low pressure chamber interface (200), respectively.The high-pressure chamber interface (100) of the filter element is in communication with the high-pressure chamber of the filter element, the low-pressure chamber interface (200) of the filter element is in communication with the low-pressure chamber of the filter element, a sealing ring five (418) is provided between the plug one (401) and the indicating housing (414), a sealing ring four (416) is provided between the piston one (405) and the indicating housing (414), and a protective ring (406) is provided on the outer side of the sealing ring four (416). The pressure difference of the filter element drives the piston one (405) to move downward against the elastic force of the spring one (407), and under the magnetic force of the permanent magnet one (412) and the permanent magnet two (413), the indicating cap one (408) moves upward. When the pressure difference of the filter element A (15) increases to a specified value, the hydraulic pressure drives the piston two (417) to move downward against the spring two (415), and under the magnetic force of the permanent magnet three (419) and the permanent magnet four (420), the indicating cap two (422) moves upward. , 2. The non-stop passive automatic filter element switching filter according to claim 1, characterized in that: The lower housing (2) is provided with two parts, the filter element A (15) and the filter element B (23) are identical and are respectively installed in the lower housing (2), the bottom of the lower housing (2) is connected to an oil drain screw (3) via a thread, the inlet pipe joint (9) is connected to the upper housing (1) via a thread, and a sealing ring 1 (10) is provided between the inlet pipe joint (9) and the upper housing (1), the outlet pipe joint (13) is connected to the upper housing (1) via a thread, and a sealing ring 2 (12) is provided between the outlet pipe joint (13) and the upper housing (1).

3. The non-stop passive automatic filter element switching filter according to claim 1, characterized in that: Indicator cap 1 (408) and indicator cap 2 (422) are respectively in green, orange and red colors. The three indicator colors, green, orange and red, correspond to three working states of the filter element, green - normal working, orange - not working, and red - blocked.

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