A two-way self-sealing line filter

Abstract

This invention discloses a bidirectional self-sealing pipeline filter, comprising an upper housing and a lower housing for mounting filter components. The housing contains a first flow channel, a second flow channel, and a third flow channel that are sequentially connected along the fluid flow direction. The housing also contains a first opening / closing component and a second opening / closing component, which respectively control the opening and closing of the first and second flow channels. These components have a tendency to close or open their respective flow channels. This invention automatically opens the first and second flow channels during filter component installation and automatically disengages the drive mechanism during filter component removal, restoring the opening / closing components to a sealed state. This eliminates the need for an independent drive mechanism, reduces the number of parts, makes the overall structure more compact, lowers the failure rate, and improves the reliability of the device.

Description

Technical Field

[0001] This invention relates to the field of pipeline filters, and in particular to a bidirectional self-sealing pipeline filter. Background Technology

[0002] Hydraulic systems, lubrication systems, and other pressurized fluid transmission systems typically include pressure line filters to filter particulate impurities in the working medium, preventing them from entering critical components such as hydraulic pumps, control valves, and actuators, thereby improving system reliability and service life. These filters are generally installed in pressure lines and operate under constant pressure. Once the filter element reaches the end of its service life, the filter housing needs to be periodically disassembled and the filter element replaced.

[0003] Most existing pressure line filters use a detachable upper and lower housing structure. Before replacing the filter element, it is usually necessary to close the shut-off valves at both ends of the pipeline and depressurize the system before disassembling the filter housing. If shut-off valves are not installed or the residual pressure in the system is not completely released, the working medium in the pressure line can easily leak from the filter connection during disassembly. This not only wastes hydraulic oil but also easily contaminates equipment and the working environment. In severe cases, it may even endanger the personal safety of maintenance personnel due to high-pressure medium jetting. Therefore, the maintenance process is cumbersome and has low safety.

[0004] To reduce media leakage during disassembly, existing technologies have proposed pressure line filters with self-sealing functions. These involve installing a single self-sealing valve on either the filter inlet or outlet side. A spring-driven valve core resets the valve, automatically closing the corresponding flow channel during filter element disassembly to reduce leakage. However, most existing self-sealing structures can only seal one side of the flow channel. When the other side remains connected to the pressure line, media leakage may still occur, especially under bidirectional pressure conditions or when residual pressure exists in the pipeline. A single-sided seal is insufficient to simultaneously isolate the pressure media at both ends of the filter, still requiring the use of an external shut-off valve. This prevents truly enabling rapid online maintenance of pressure line filters.

[0005] Furthermore, while some existing filters employ a structure with valve cores on both the inlet and outlet sides, these two valve cores are primarily used to control fluid flow direction or prevent backflow. Their opening and closing actions mainly rely on fluid pressure or unidirectional flow characteristics and are not designed for filter disassembly and maintenance. When the filter element is disassembled, the lack of coordinated control between the valve cores can easily lead to a chaotic sequence of simultaneous opening or closing of the inlet and outlet, causing instantaneous leakage, hydraulic shock, or localized negative pressure, affecting sealing reliability and valve core lifespan.

[0006] On the other hand, existing self-sealing valve cores usually adopt a sealing method that relies solely on spring reset. The valve core lacks a guiding structure during its movement, and is prone to affecting the flexibility of opening and closing due to uneven wear, tilting, or jamming. Under high-pressure conditions, the fit between the valve core and the sealing surface is not reliable enough, and internal leakage is likely to occur after long-term use, reducing the overall sealing performance of the filter. Summary of the Invention

[0007] One object of the present invention is to provide a bidirectional self-sealing pipeline filter that at least solves any of the above-mentioned technical problems.

[0008] Specifically, the present invention provides a bidirectional self-sealing pipeline filter, comprising an upper housing and a lower housing for mounting filter components. The upper and lower shells form a first flow channel, a second flow channel, and a third flow channel that are sequentially connected along the fluid flow direction. The upper housing is provided with a first opening and closing component and a second opening and closing component that control the opening and closing of the first flow channel and the second flow channel respectively. The first opening and closing component and the second opening and closing component have the tendency to close or open the corresponding first flow channel and the second flow channel. The filter assembly is provided with a drive unit, which is used to control the opening of the first opening and closing component and the second opening and closing component when the filter assembly is installed in the working position, so as to connect the first flow channel, the second flow channel and the third flow channel. When the drive unit is detached from the installed working position, it releases the control of the first and second opening and closing components to block the flow of the first and second flow channels.

[0009] Furthermore, the first opening and closing assembly includes: a first sealing valve core, a first biasing member, and a first sealing assembly. The first sealing valve core and the first biasing member are disposed outside the guide structure, and the first sealing valve core moves toward the sealing position of the first flow channel under the action of the first biasing member.

[0010] Furthermore, the second opening and closing assembly includes: a second sealing valve core, a second biasing member, and a second sealing assembly. The second sealing valve core and the second biasing member are disposed inside the guide mechanism, and the second sealing valve core moves toward the second flow channel sealing position under the action of the second biasing member.

[0011] Furthermore, the first opening and closing component and the second opening and closing component are set independently, and the two are respectively set to the first flow channel and the second flow channel.

[0012] Furthermore, the driving unit includes a first driving member and a second driving member, which are respectively disposed on the upper part of the filter assembly, and the first driving member and the second driving member cooperate with the first opening and closing assembly and the second opening and closing assembly, respectively.

[0013] Furthermore, the first driving member and the second driving member have driving surfaces that act sequentially on the first opening and closing component and the second opening and closing component along the axial direction of the filter component.

[0014] Furthermore, the driving surface has a height difference along the axial direction of the filter assembly, so that the second opening and closing component opens before the first opening and closing component during the installation of the filter assembly, and the first opening and closing component closes before the second opening and closing component during the disassembly of the filter assembly.

[0015] Furthermore, the first valve core is disposed outside the guide structure and moves axially along the guide structure.

[0016] Furthermore, the guiding structure is one of the following: a guide groove, a guide sleeve, or a guide hole.

[0017] Furthermore, the first sealing valve core has a conical sealing structure.

[0018] Furthermore, a third biasing member is provided on the inner bottom surface of the lower housing, which abuts against the filter assembly.

[0019] Furthermore, the first paranoid component, the second paranoid component, and the third paranoid component adopt a spring structure.

[0020] Furthermore, both the first sealing assembly and the second sealing assembly use sealing rings instead of sealing rings.

[0021] Furthermore, the second opening and closing assembly also includes a guide valve stem and a guide cylinder. The guide valve stem is disposed inside the guide cylinder, and the guide cylinder is located at the center of the second flow channel and is coaxially arranged with the second guide flow channel.

[0022] Furthermore, the connecting port in the second flow channel is coaxially arranged with the second throttling valve core, and the diameter of the second throttling valve core is larger than the connecting port.

[0023] The technical effects and advantages of this invention are as follows: This invention provides a first opening and closing component and a second opening and closing component on the inlet and outlet sides of the filtration device, respectively. During the disassembly of the filtration component, the two opening and closing components can automatically close their corresponding flow channels, achieving synchronous isolation on both sides of the pressure pipeline. This effectively prevents the pressure medium from leaking from the inlet and outlet, avoiding the problem of large-scale leakage when replacing filter elements in traditional filters, and improving the safety of the maintenance process. The filtration component itself drives the opening and closing components to complete the opening and closing of the flow channels, eliminating the need for additional shut-off valves or ball valves to complete the disassembly and maintenance of the filtration component. This reduces the system piping configuration, lowers installation costs, shortens equipment maintenance time, and improves the online maintenance efficiency of the pressure pipeline filtration device.

[0024] This invention uses the filter assembly as the driving component for the opening and closing assembly. During filter assembly installation, the first and second flow channels are automatically opened; during filter assembly disassembly, the driving mechanism is automatically released, restoring the opening and closing assembly to a sealed state. This eliminates the need for an independent driving mechanism, reducing the number of parts and making the overall structure more compact. It also lowers the failure rate and improves the reliability of the device. By incorporating a driving section with a height difference, the second opening and closing assembly opens first and then the first during filter assembly installation, and closes first and then the second during disassembly. This allows the pressure medium to gradually establish or cut off the flow, effectively reducing instantaneous pressure surges and media jetting, and improving system operational stability and maintenance safety. Attached Figure Description

[0025] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic diagram of the internal cross-sectional structure of the present invention.

[0026] Figure 2 This is a schematic cross-sectional view of the upper shell structure of the present invention.

[0027] In the diagram: 100, upper housing; 101, first flow channel; 102, second flow channel; 103, third flow channel; 200, first opening / closing assembly; 201, first biasing member; 202, first sealing valve core; 203, first sealing assembly; 300, second opening / closing assembly; 301, second sealing valve core; 302, guide valve stem; 303, second biasing member; 304, guide cylinder; 305, second sealing assembly; 400, guide structure; 401, third sealing assembly; 500, lower housing; 501, filter assembly; 502, third biasing member; 503, first driving member; 504, second driving member; 505, connecting port. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Figure 1 This is a schematic diagram of the internal cross-sectional structure of the present invention. Figure 2 This is a schematic cross-sectional view of the upper shell structure of the present invention.

[0030] In this embodiment, the present invention provides a bidirectional self-sealing pipeline filter, including an upper housing 100 and a lower housing 500 for mounting a filter assembly 501. The upper housing 100 and the lower housing 500 can be connected by a detachable connection such as a flange connection, a threaded connection, or a snap-fit ​​connection to facilitate the installation and replacement of the filter assembly 501. The upper housing 100 and the lower housing 500 together enclose the internal cavity of the filter, and a first flow channel 101, a second flow channel 102, and a third flow channel 103 are formed in sequence along the fluid flow direction within the cavity.

[0031] Specifically, the first flow channel 101 is located on one side of the upper housing 100 and is used to connect with the inlet end of the external pressure pipeline to guide the working medium to be filtered into the filter. The second flow channel 102 is located on the other side of the upper housing 100 and is used to connect with the outlet end of the external pressure pipeline to guide the filtered working medium out of the filter. The third flow channel 103 is located inside the lower housing 500 and is connected between the first flow channel 101 and the second flow channel 102. The working medium flows through the first flow channel 101, the third flow channel 103 and the second flow channel 102 in sequence to complete the filtration process.

[0032] The upper housing 100 is provided with a first opening and closing component 200 and a second opening and closing component 300, which respectively control the opening and closing of the first flow channel 101 and the second flow channel 102. The first opening and closing component 200 and the second opening and closing component 300 are independently provided and correspond to different flow channel settings. The first opening and closing component 200 has a tendency to close or open the first flow channel 101, and the second opening and closing component 300 has a tendency to close or open the second flow channel 102. The filter assembly 501 is provided with a driving unit. When the filter assembly 501 is installed in the working position, the driving unit is used to control the opening of the first opening and closing component 200 and the second opening and closing component 300 to connect the first flow channel 101, the second flow channel 102 and the third flow channel 103. When the driving unit is removed from the installed working position, it releases the control of the first opening and closing component 200 and the second opening and closing component 300 to block the flow of the first flow channel 101 and the second flow channel 102.

[0033] like Figure 2As shown, the first opening and closing assembly 200 includes a first sealing valve core 202, a first biasing member 201, and a first sealing assembly 203. The first sealing valve core 202 is disposed within the first flow channel 101. Under the action of the first biasing member 201, the first sealing valve core 202 moves toward the sealing position of the first flow channel 101. The first biasing member 201 preferably adopts a spring structure, with one end abutting against the inner wall of the upper housing 100 and the other end abutting against the first sealing valve core 202, for providing biasing pressure to the first sealing valve core 202 toward the sealing position of the first flow channel 101. The first sealing assembly 203 is disposed between the sealing surface of the first sealing valve core 202 and the first flow channel 101 to improve sealing reliability. The first sealing assembly 203 preferably adopts a sealing ring, such as an O-ring. The first sealing valve core 202 preferably adopts a conical sealing structure. The conical sealing structure has good centering and sealing performance, and can achieve reliable sealing under high pressure conditions.

[0034] The second opening and closing assembly 300 includes a second sealing valve core 301, a second biasing member 303, and a second sealing assembly 401. The second sealing valve core 301 is disposed within the second flow channel 102. Under the action of the second biasing member 303, the second sealing valve core 301 moves toward the sealing position of the second flow channel 102. The second biasing member 303 preferably adopts a spring structure, with one end abutting against the inner wall of the upper housing 100 and the other end abutting against the second sealing valve core 301, for providing biasing force to the second sealing valve core 301 toward the sealing position of the second flow channel 102. The second sealing assembly 401 is disposed between the second sealing valve core 301 and the sealing surface of the second flow channel 102 to improve sealing reliability. The second sealing assembly 401 preferably adopts a sealing ring, such as an O-ring.

[0035] The second opening and closing assembly 300 further includes a guide valve stem 302 and a guide cylinder 304. The guide valve stem 302 is disposed inside the guide cylinder 304. One end of the guide valve stem 302 is fixedly connected to or integrally formed with the second sealing valve core 301, and the other end of the guide valve stem 302 extends into the guide cylinder 304 and can slide along the axial direction of the guide cylinder 304. A spring is connected to the guide valve stem 302. The guide cylinder 304 is disposed in the middle of the second flow channel 102 and is coaxially arranged with the second flow channel 102. The inner wall of the guide cylinder 304 slides in cooperation with the outer wall of the guide valve stem 302, providing precise guidance for the movement of the second sealing valve core 301, effectively preventing the second sealing valve core 301 from experiencing uneven wear, tilting, or jamming during movement, and ensuring that the second opening and closing assembly 300 is flexible and reliably sealed under high pressure conditions.

[0036] The first sealing valve core 202 is disposed outside the guide structure 400 and moves axially along the guide structure 400. The guide structure 400 is fixedly disposed inside the upper housing 100 and is used to guide the movement of the first sealing valve core 202. The guide structure 400 can be one of a guide groove, a guide sleeve, or a guide hole. In this embodiment, the guide structure 400 is preferably a guide sleeve. The guide sleeve is fixedly disposed inside the first flow channel 101. The first sealing valve core 202 is sleeved on the outside of the guide sleeve and can slide axially along the guide sleeve, thereby ensuring that the first sealing valve core 202 moves along a predetermined trajectory and avoiding deviation. A third sealing component 401 is disposed on the side of the guide structure 400 facing the first sealing valve core 202. The third sealing component 401 can be an O-ring.

[0037] The connecting port 505 in the second flow channel 102 is coaxially arranged with the second sealing valve core 301, and the diameter of the second sealing valve core 301 is larger than that of the connecting port 505. With this arrangement, when the second sealing valve core 301 moves toward the sealing position of the second flow channel 102 under the action of the second biasing member 303, the end of the second sealing valve core 301 can completely cover and block the connecting port 505, achieving a reliable seal.

[0038] The driving unit includes a first driving member 503 and a second driving member 504. The first driving member 503 and the second driving member 504 are respectively disposed on the upper part of the filter assembly 501, and the first driving member 503 and the second driving member 504 cooperate with the first opening and closing assembly 200 and the second opening and closing assembly 300, respectively. Specifically, the first driving member 503 corresponds to the first sealing valve core 202 and is used to push the first sealing valve core 202 to overcome the bias pressure of the first bias member 201 and open the first flow channel 101 during the installation of the filter assembly 501. The second driving member 504 corresponds to the second sealing valve core 301 and is used to push the second sealing valve core 301 to overcome the bias pressure of the second bias member 303 and open the second flow channel 102 during the installation of the filter assembly 501.

[0039] The first driving component 503 and the second driving component 504 have driving surfaces that act sequentially on the first opening and closing component 200 and the second opening and closing component 300 along the axial direction of the filter assembly 501. The driving surfaces have a height difference along the axial direction of the filter assembly 501, so that the second opening and closing component 300 opens before the first opening and closing component 200 during the installation of the filter assembly 501, and the first opening and closing component 200 closes before the second opening and closing component 300 during the disassembly of the filter assembly 501. Through this height difference setting, the timing control of the first opening and closing component 200 and the second opening and closing component 300 is realized, effectively avoiding problems such as instantaneous leakage, hydraulic shock or local negative pressure caused by the chaotic timing of simultaneous opening or closing of the inlet and outlet.

[0040] A third biasing member 502 is provided on the inner bottom surface of the lower housing 500. The third biasing member 502 abuts against the filter assembly 501. The third biasing member 502 is preferably a spring structure. One end of the third biasing member 502 abuts against the bottom inner wall of the lower housing 500, and the other end abuts against the bottom of the filter assembly 501. It is used to provide biasing force to the filter assembly 501 toward the installation working position, so that the filter assembly 501 remains stable after installation, and at the same time assists the filter assembly 501 to be smoothly removed from the working position during disassembly.

[0041] Example 2 The difference between this embodiment and Embodiment 1 is that the guide structure 400 is a guide groove. Specifically, the inner wall of the upper housing 100 is provided with a guide groove extending axially along the first flow channel 101, and the outer wall of the first sealing valve core 202 is provided with a guide protrusion that slides with the guide groove. The guide protrusion is embedded in the guide groove and can slide along the guide groove, thereby providing guidance for the movement of the first sealing valve core 202.

[0042] Example 3 The difference between this embodiment and Embodiment 1 is that the guide structure 400 is a guide hole. Specifically, a guide post is fixedly installed inside the upper housing 100. The guide post extends axially along the first flow channel 101. The first sealing valve core 202 has a guide hole that slides with the guide post. The guide post passes through the guide hole, and the first sealing valve core 202 can slide axially along the guide post.

[0043] Example 4 The difference between this embodiment and Embodiment 1 is that the first sealing valve core 202 is a conical sealing structure. The end of the first sealing valve core 202 is conical, and the sealing surface of the first flow channel 101 is a conical hole that matches the conical shape. The conical sealing structure and the conical hole cooperate to achieve a line seal, resulting in better sealing performance.

[0044] When the filter assembly is installed, when the filter assembly 501 needs to be installed, the operator puts the filter assembly 501 into the lower housing 500 and pushes the filter assembly 501 upward to the working position. During this process, the first drive member 503 and the second drive member 504 on the upper part of the filter assembly 501 contact the first sealing valve core 202 and the second sealing valve core 301 respectively. Since the driving surfaces of the first drive member 503 and the second drive member 504 have a height difference along the axial direction of the filter assembly 501, the second drive member 504 contacts the corresponding valve core before the first drive member 503.

[0045] As the filter assembly 501 continues to move upward, the second drive member 504 first pushes the second sealing valve core 301 to overcome the biasing force of the second bias member 303 and move upward, causing the second sealing valve core 301 to disengage from the communication port 505 of the second flow channel 102, and the second flow channel 102 is opened. Subsequently, the first drive member 503 pushes the first sealing valve core 202 to overcome the biasing force of the first bias member 201 and move upward, causing the first sealing valve core 202 to disengage from the sealing position of the first flow channel 101, and the first flow channel 101 is opened.

[0046] Once the filter assembly 501 is fully installed, the first flow channel 101, the second flow channel 102, and the third flow channel 103 are connected in sequence. The working medium can enter the filter along the first flow channel 101, and after being filtered by the filter assembly 501, it flows out from the third flow channel 103.

[0047] In normal operation, the filter assembly 501 remains in the working position. The first drive element 503 and the second drive element 504 continuously push the first sealing valve core 202 and the second sealing valve core 301, respectively, keeping the first flow channel 101 and the second flow channel 102 open. The working medium enters the first flow channel 101 from the external pressure pipeline, flows through the third flow channel 103, and then enters the filter assembly 501 for filtration. The filtered clean medium flows out of the filter from the second flow channel 102 and enters the external pressure pipeline. When the filter assembly 501 needs to be replaced, the operator pulls the filter assembly 501 downward from the lower housing 500. During this process, the filter assembly 501 gradually moves away from the working position, and the pushing action of the first drive element 503 and the second drive element 504 on the first sealing valve core 202 and the second sealing valve core 301 gradually weakens.

[0048] Because the driving surfaces of the first driving member 503 and the second driving member 504 have a height difference along the axial direction of the filter assembly 501, the first driving member 503 disengages from its corresponding valve core before the second driving member 504. Therefore, under the biasing force of the first biasing member 201, the first sealing valve core 202 moves towards the sealing position of the first flow channel 101, closing the first flow channel 101. Subsequently, under the biasing force of the second biasing member 303, the second sealing valve core 301 moves towards the sealing position of the second flow channel 102, closing the second flow channel 102.

[0049] After the filter assembly 501 is completely disassembled, both the first flow channel 101 and the second flow channel 102 are reliably closed, effectively preventing the working medium in the external pressure pipeline from leaking from the filter connection.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bidirectional self-sealing pipeline filter, comprising an upper housing and a lower housing for mounting filter components, characterized in that, The upper and lower shells form a first flow channel, a second flow channel, and a third flow channel that are sequentially connected along the fluid flow direction. The upper housing is provided with a first opening and closing component and a second opening and closing component that control the opening and closing of the first flow channel and the second flow channel respectively. The first opening and closing component and the second opening and closing component have the tendency to close or open the corresponding first flow channel and the second flow channel. The filter assembly is provided with a drive unit, which is used to control the opening of the first opening and closing component and the second opening and closing component when the filter assembly is installed in the working position, so as to connect the first flow channel, the second flow channel and the third flow channel. When the drive unit is detached from the installed working position, it releases the control of the first and second opening and closing components to block the flow of the first and second flow channels.

2. The bidirectional self-sealing pipeline filter according to claim 1, characterized in that, The first opening and closing assembly includes: a first sealing valve core, a first biasing member, and a first sealing assembly. The first sealing valve core and the first biasing member are disposed outside the guide structure, and the first sealing valve core moves toward the sealing position of the first flow channel under the action of the first biasing member.

3. A bidirectional self-sealing pipeline filter according to claim 1, characterized in that, The second opening and closing assembly includes: a second sealing valve core, a second biasing member, and a second sealing assembly. The second sealing valve core and the second biasing member are disposed inside the guide mechanism, and the second sealing valve core moves toward the second flow channel sealing position under the action of the second biasing member.

4. A bidirectional self-sealing pipeline filter according to claim 1, characterized in that, The first opening and closing component and the second opening and closing component are set independently, and they are respectively set to the first flow channel and the second flow channel.

5. A bidirectional self-sealing pipeline filter according to claim 1, characterized in that, The driving unit includes a first driving member and a second driving member, which are respectively disposed on the upper part of the filter assembly, and the first driving member and the second driving member cooperate with the first opening and closing assembly and the second opening and closing assembly, respectively.

6. A bidirectional self-sealing pipeline filter according to claim 5, characterized in that, The first driving member and the second driving member have driving surfaces that act sequentially on the first opening and closing component and the second opening and closing component along the axial direction of the filter component.

7. A bidirectional self-sealing pipeline filter according to claim 6, characterized in that, The driving surface has a height difference along the axial direction of the filter assembly, so that the second opening and closing component opens before the first opening and closing component during the installation of the filter assembly, and the first opening and closing component closes before the second opening and closing component during the disassembly of the filter assembly.

8. A bidirectional self-sealing pipeline filter according to claim 2, characterized in that, The first valve core is located outside the guide structure and moves axially along the guide structure.

9. A bidirectional self-sealing pipeline filter according to claim 8, characterized in that, The guiding structure is one of the following: guide groove, guide sleeve, and guide hole.

10. A bidirectional self-sealing pipeline filter according to claim 2, characterized in that, The first sealing valve core has a conical sealing structure.

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