Filter valve, hydraulic system and agricultural machine

Abstract

This invention belongs to the field of fluid filtration and discloses a filter valve, a hydraulic system, and agricultural machinery. When fluid flows through the filter valve, small-sized impurities in the fluid can be intercepted by the filter screen structure and collected in the core. However, when the filter screen structure intercepts large-sized impurities, resulting in insufficient fluid flow or direct blockage of the filter screen, the fluid pressure at the input end of the core will continuously increase. When the fluid pressure increases to a certain level, the bypass channel in the filter valve will be opened, and the fluid can pass through the fluid valve normally through the bypass channel. The filter valve can restrict the outflow of large-sized impurities while maintaining a certain fluid flow. In scenarios where the filter valve is applied to the hydraulic system of agricultural machinery such as harvesters, it can effectively reduce the risk of hydraulic system failure and improve the reliability of the hydraulic system.

Description

Technical Field

[0001] This invention relates to the field of fluid filtration technology, specifically to a filter valve, a hydraulic system, and agricultural machinery. Background Technology

[0002] Currently, the filtration accuracy of ordinary hydraulic filters used in the hydraulic systems of agricultural harvesters is generally 10μm. When large foreign objects (such as large contaminant fragments) enter, the filter is easily blocked and can no longer perform its filtering function. At this time, the bypass pipeline outside the filter will open, allowing the impurities to pass through directly, which will cause the hydraulic components such as the hydraulic steering gear, reversing valve, and hydraulic motor to be blocked, and lead to excessive back pressure in the gear pump and failure. Summary of the Invention

[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, the present invention provides a filter valve, a hydraulic system and agricultural machinery. The filter valve can maintain a certain fluid flow even when it is temporarily unable to filter due to blockage by large impurities, and can limit the outflow of large impurities. It is especially suitable for use in the hydraulic system of agricultural machinery such as harvesters, so as to effectively reduce the risk of hydraulic system failure.

[0004] To achieve the above objectives, a first aspect of the present invention provides a filter valve comprising:

[0005] The cylindrical shell assembly has a fluid inlet chamber, a fluid filter chamber and a fluid outlet chamber that are connected sequentially along the axial direction. The junction between the peripheral wall of the fluid inlet chamber and the peripheral wall of the fluid filter chamber forms a cylindrical shell sealing wall facing the fluid filter chamber.

[0006] The filter element mechanism includes a preload spring, a core coaxially disposed within the fluid filtration chamber, and a filter screen structure disposed within the core. The core has an input port communicating with the fluid input chamber and an output port communicating with the fluid output chamber at its axial ends. Under the elastic restoring force of the preload spring, the core maintains a tendency to move such that the peripheral end face of the input port forms a sealing contact with the sealing wall surface of the cylindrical shell.

[0007] A bypass channel is formed between the peripheral wall of the core and the peripheral wall of the fluid filter chamber and maintains communication with the fluid output chamber. In the state where the sealing pressure is not formed, the bypass channel is connected to the fluid input chamber. In the state where the sealing pressure is formed, the bypass channel is cut off from the fluid input chamber.

[0008] Optionally, a first core flow hole is formed through the peripheral wall of the core, and the bypass channel, the first core flow hole, the core output port and the fluid output chamber are sequentially connected, and the filter structure is disposed between the first core flow hole and the core input port.

[0009] Optionally, the bypass channel has a bypass channel inlet and a bypass channel outlet at its two axial ends, and the bypass channel outlet, the fluid filter chamber, the area between the core output port and the fluid output chamber, and the fluid output chamber are sequentially connected.

[0010] Optionally, the filter structure includes a filter screen sleeve fitted inside the core, with a hood opening and an end face filter screen formed at both axial ends of the filter screen sleeve, and the hood opening facing the input port of the core.

[0011] Optionally, a second core flow hole is formed through the peripheral wall of the core, the second core flow hole is connected to the bypass channel, and a peripheral wall filter screen is formed on the peripheral wall of the filter screen cover to cover the second core flow hole.

[0012] Optionally, the inner peripheral wall of the cylinder core is formed with an annular protrusion, and the filter structure is disposed between the annular protrusion and the input port of the cylinder core, with the filter structure and the annular protrusion being aligned axially with the cylinder core.

[0013] Optionally, the filter structure is detachably installed inside the core, and the filter structure abuts against the annular protrusion along the axial direction of the core.

[0014] Optionally, the pre-tension spring is a pre-compression spring, and the peripheral wall of the fluid output cavity is formed with an annular step portion facing the core output port. The two axial ends of the pre-compression spring are elastically pressed against the step surface of the annular step portion and the peripheral end face of the core output port, respectively.

[0015] Optionally, the peripheral end face of the core input port and the sealing wall surface of the cylindrical shell are both formed as sealing cone surfaces.

[0016] Optionally, the cylindrical housing assembly includes a cylindrical housing body and an input connector and an output connector connected to both axial ends of the cylindrical housing body, wherein the fluid input cavity is formed in the input connector, the fluid filter cavity is formed in the cylindrical housing body, and the fluid output cavity is formed in the output connector.

[0017] Optionally, both the input connector and the output connector are configured as quick-install connectors that allow the filter valve to be quickly installed into an external structure.

[0018] Optionally, the input connector is formed as a compression fitting integrally formed with the cylindrical shell body, and the output connector is formed as a straight-through connector detachably connected to the cylindrical shell body.

[0019] Optionally, a sealing gasket is provided between the end through connector and the cylindrical shell body.

[0020] A second aspect of the present invention provides a hydraulic system comprising the aforementioned filter valve.

[0021] A third aspect of the present invention provides an agricultural machine that includes the hydraulic system described above.

[0022] With the above technical solution, when fluid without impurities or with small-sized impurities enters the filter valve of the present invention, the fluid can flow out of the filter valve after passing through the fluid input chamber, the inner cavity of the cylinder core and the fluid output chamber in the column housing assembly in sequence. Small-sized impurities can be intercepted by the filter screen structure and collected in the cylinder core. During the process of the fluid passing through the filter valve, the cylinder core can always be kept in a position where the peripheral end face of the cylinder core input port forms a sealing pressure with the sealing wall of the column housing under the action of the elastic restoring force of the pre-tightening spring. That is, at this time, the bypass flow channel is not connected to the fluid input chamber. When the filter structure intercepts large impurities, leading to insufficient fluid flow or direct clogging of the filter, the fluid pressure at the input end of the core will continuously increase. When this pressure increases to the point where it overcomes the elastic restoring force of the preload spring, causing the preload spring to further increase its elastic deformation, the peripheral end face of the core's input port will disengage from the sealing wall of the cylindrical shell. At this point, the bypass channel connects to the fluid input chamber, and because the bypass channel is always connected to the fluid output chamber, the fluid can still maintain a certain flow rate when passing through the filter valve, and large impurities are confined within the core and cannot flow out. In scenarios where filter valves are applied to the hydraulic systems of agricultural machinery such as harvesters, this effectively reduces the risk of hydraulic system failure and improves the reliability of the hydraulic system.

[0023] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a perspective view of a filter valve according to a specific embodiment of the present invention;

[0026] Figure 2 for Figure 1 Exploded view of the filter valve structure in the image;

[0027] Figure 3 for Figure 1 A cross-sectional view of the filter valve in the cylinder core in the state where the peripheral end face of the cylinder core inlet port is sealed and pressed against the sealing wall of the cylinder shell;

[0028] Figure 4 for Figure 1 A cross-sectional view of the filter valve in the cylinder core in the state where the peripheral end face of the cylinder core inlet port is not in a sealed press-fit with the sealing wall of the cylinder shell;

[0029] Figure 5 for Figure 1 A cross-sectional view of the compression fitting in the middle;

[0030] Figure 6 for Figure 1 A cross-sectional view of the straight-through connector in the middle;

[0031] Figure 7 for Figure 1 A cross-sectional view of the core.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100 filter valve

[0034] 101 Compression fitting; 102 Column housing body

[0035] 103 Straight-through connector; 104 Pre-compression spring

[0036] 105 Core Filter, 106 Filter Screen Cover

[0037] 107 Sealing gasket

[0038] 101a Fluid inlet chamber; 102a Fluid filter chamber

[0039] 102b Column shell sealing wall surface; 102c Bypass flow channel

[0040] 102d Bypass channel inlet; 102e Bypass channel outlet

[0041] 103a Fluid outlet cavity; 103b Annular stepped section

[0042] 105a Core input port; 105b Core output port

[0043] 105c First core flow hole; 105d Second core flow hole

[0044] 105e Annular protrusion Detailed Implementation

[0045] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0047] In the embodiments of the present invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positional relationships of the components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0048] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0049] Reference Figures 1 to 7 The first exemplary embodiment of the present invention provides a filter valve 100, which includes a housing assembly, a filter element mechanism and a bypass channel 102c.

[0050] Specifically, the cylindrical housing assembly has a fluid inlet chamber 101a, a fluid filter chamber 102a, and a fluid outlet chamber 103a connected sequentially along the axial direction. When fluid passes through the filter valve 100, the fluid flows into the filter valve 100 from the fluid inlet chamber 101a and flows out of the filter valve 100 from the fluid outlet chamber 103a. A cylindrical housing sealing wall surface 102b facing the fluid filter chamber 102a is formed at the junction of the peripheral wall surface of the fluid inlet chamber 101a and the peripheral wall surface of the fluid filter chamber 102a.

[0051] The filter element mechanism includes a preload spring, a core 105 coaxially disposed within the fluid filtration chamber 102a, and a filter screen structure disposed within the core 105. The core 105 has an input port 105a and an output port 105b at its axial ends. The input port 105a communicates with the fluid input chamber 101a, and the output port 105b communicates with the fluid output chamber 103a. This allows fluid to flow sequentially through the fluid input chamber 101a, the input port 105a, the inner cavity of the core 105, the output port 105b, and the output chamber 103a before exiting the filter valve 100. Furthermore, the preload spring can be a pre-compression spring 104 or a pre-tension spring. The elastic restoring force of the preload spring is transmitted to the core 105, ensuring that the core 105 always has a tendency to move so that the peripheral end face of the input port 105a forms a sealing contact with the sealing wall surface 102b of the cylindrical shell.

[0052] A bypass channel 102c is formed between the peripheral wall of the core 105 and the peripheral wall of the fluid filter chamber 102a, and the bypass channel 102c is always in communication with the fluid output chamber 103a. When the peripheral end face of the core input port 105a is not in a sealed press-fit with the cylindrical shell sealing wall 102b, the bypass channel 102c is still in communication with the fluid input chamber 101a. That is, at this time, the fluid input chamber 101a, the bypass channel 102c, and the fluid output chamber 103a are connected, and fluid can pass through the filter valve 100 via this passage. When the peripheral end face of the core input port 105a is in a sealed press-fit with the cylindrical shell sealing wall 102b, the bypass channel 102c is cut off from the fluid input chamber 101a, and fluid cannot flow from the fluid input chamber 101a into the bypass channel 102c.

[0053] With the above settings, when fluid without impurities or with small impurities enters the filter valve 100, the fluid can flow out of the filter valve 100 after passing through the fluid inlet chamber 101a, the inner cavity of the core 105, and the fluid outlet chamber 103a in the cylindrical shell assembly. Small impurities can be intercepted by the filter screen structure and collected in the core 105. During the process of the fluid passing through the filter valve 100, the core 105 can always be kept in a position where the peripheral end face of the core inlet port 105a forms a sealing pressure with the sealing wall surface 102b of the cylindrical shell under the action of the elastic restoring force of the pre-tightening spring. That is, at this time, the bypass channel 102c is not connected to the fluid inlet chamber 101a.

[0054] When the filter structure intercepts large impurities, resulting in insufficient fluid flow or direct clogging of the filter, the fluid pressure at the input end of the core 105 will continuously increase. When this fluid pressure increases to the point where it can overcome the elastic restoring force of the preload spring, causing the preload spring to further increase its elastic deformation, the peripheral end face of the core input port 105a will disengage from the sealing wall surface 102b of the cylindrical shell. At this time, the bypass channel 102c connects to the fluid input chamber 101a, and since the bypass channel 102c is always connected to the fluid output chamber 103a, the fluid can still maintain a certain flow rate when passing through the filter valve 100, and large impurities are confined within the core 105 and cannot flow out. In scenarios where the filter valve 100 is applied to the hydraulic systems of agricultural machinery such as harvesters, it can effectively reduce the risk of hydraulic system failure and improve the reliability of the hydraulic system.

[0055] In the existing technology, when the filter installed in the hydraulic system of agricultural machinery such as harvesters becomes clogged and loses its filtering function, in order to ensure that the hydraulic system can continue to operate normally, users usually directly replace it with a new filter, and the removed filter is discarded, resulting in waste.

[0056] Regarding the filter valve 100 in this exemplary embodiment, refer to... Figure 2The filter valve 100 can be designed with detachable components, including the housing assembly, preload spring, cylinder core 105, and filter screen structure. This allows for periodic disassembly and removal of the filter valve 100 to clean collected impurities, followed by reassembly for reuse. This extends the filter valve 100's lifespan, reduces waste, and is both economical and environmentally friendly. Furthermore, the filter valve 100's relatively small number of components makes it easy to assemble and disassemble. Its compact overall size also saves space. Moreover, the filter screen structure can be reinforced with a metal frame to reduce the risk of deformation and movement, and can be replaced with filter screens of different mesh sizes, broadening the application range of the filter valve 100.

[0057] The following are two specific embodiments that allow the bypass channel 102c to remain open to the fluid output chamber 103a. However, the actual configuration is not limited to these. For example, the two embodiments listed can be combined.

[0058] In the first embodiment, in which the bypass channel 102c remains normally open to the fluid output chamber 103a, refer to Figure 3 and Figure 4 The peripheral wall of the core 105 has a first core flow hole 105c formed through it. A bypass channel 102c, the first core flow hole 105c, the core output port 105b, and the fluid output chamber 103a are sequentially connected. Since the peripheral end face of the core input port 105a is not in a sealed press-fit with the cylindrical shell sealing wall 102b, and the bypass channel 102c is still connected to the fluid input chamber 101a, fluid can flow out of the filter valve 100 sequentially through the fluid input chamber 101a, the bypass channel 102c, the first core flow hole 105c, the core output port 105b, and the fluid output chamber 103a. To prevent impurities inside the core 105 from entering the bypass channel 102c through the first core flow hole 105c, a filter screen structure needs to be placed between the first core flow hole 105c and the core input port 105a.

[0059] In the second embodiment, where the bypass channel 102c and the fluid output chamber 103a remain constantly connected (not shown), the bypass channel 102c has a bypass channel inlet 102d and a bypass channel outlet 102e formed at its two axial ends, respectively. The bypass channel outlet 102e, the region of the fluid filter chamber 102a between the core output port 105b and the fluid output chamber 103a, and the fluid output chamber 103a are sequentially connected. For the region of the fluid filter chamber 102a between the core output port 105b and the fluid output chamber 103a, as long as the axial length of this region is set sufficiently large, the following can be avoided: Figure 4In this embodiment, the disappearance of this area results in the bypass channel outlet 102e and the fluid output chamber 103a being unable to communicate directly. Since the bypass channel 102c is still connected to the fluid input chamber 101a when the peripheral end face of the core input port 105a and the sealing wall surface 102b of the cylinder shell are not in a sealed press-fit state, and the bypass channel 102c is still connected to the fluid input chamber 101a, the bypass channel inlet 102d, the bypass channel 102c, the bypass channel outlet 102e, and the fluid output chamber 103a, the fluid can flow out of the filter valve 100 in sequence.

[0060] In one embodiment, the filter structure includes a filter screen cover 106 sleeved inside the core 105. The filter screen cover 106 has a cover opening and an end-face filter screen formed at its axial ends, with the cover opening facing the core input port 105a. Thus, impurities in the fluid can be intercepted and collected by the filter screen cover 106. The filter screen cover 106 can restrict the movement of impurities over a large area and in multiple directions, preventing impurities from flowing back to the fluid input chamber 101a due to turbulence. Furthermore, the filter screen cover 106 can, to a certain extent, limit the collision of impurities with the inner peripheral wall of the core 105, providing protection to the inner peripheral wall of the core 105 and preventing sharp, hard impurities from scratching the inner peripheral wall surface of the core 105. Therefore, even under long-term erosion by fluids such as hydraulic oil, the rate of erosion of the core 105 can be slowed down.

[0061] In one embodiment, a second core flow hole 105d is formed through the peripheral wall of the core 105, which communicates with the bypass channel 102c. To prevent impurities inside the core 105 from entering the bypass channel 102c through the second core flow hole 105d, a peripheral wall filter screen covering the second core flow hole 105d is formed on the peripheral wall of the filter screen cover 106. In this structure, when the end face filter screen of the filter screen cover 106 is blocked by impurities and fluid is conducted through the bypass channel 102c, the fluid flowing into the core 105 can flow into the bypass channel 102c through the second core flow hole 105d, resulting in a larger fluid flow and thus more effectively maintaining the normal flow function of the filter valve 100.

[0062] In one embodiment, the inner peripheral wall of the core 105 has an annular protrusion 105e (obviously, the annular protrusion 105e has a central through hole to connect the core input port 105a and the core output port 105b). The filter structure is disposed between the annular protrusion 105e and the core input port 105a, and the filter structure and the annular protrusion 105e are aligned axially along the core 105. By providing the annular protrusion 105e, the installation position of the filter structure can be determined when it is installed into the core 105. For example, when the filter cover 106 is installed into the core 105, it can be confirmed that the filter cover 106 is installed in place as long as the end face filter and the annular protrusion 105e are aligned axially along the core 105.

[0063] In one embodiment, the filter structure is detachably installed inside the core 105, in which case the filter structure and the annular protrusion 105e are axially positioned and abutted against each other along the core 105. Of course, after the filter structure is installed inside the core 105, some permanent fixing processes can also be used to fix the filter structure to the core 105, for example, the filter structure can be welded to the core 105.

[0064] In one embodiment, reference is made to... Figure 3 and Figure 4 The pre-tension spring is a pre-compression spring 104. The peripheral wall of the fluid output chamber 103a has an annular stepped portion 103b, with the stepped surface of the annular stepped portion 103b facing the core output port 105b. The two axial ends of the pre-compression spring 104 are elastically pressed against the stepped surface of the annular stepped portion 103b and the peripheral end face of the core output port 105b, respectively. When the filter structure intercepts large-sized impurities, resulting in insufficient fluid flow or direct blockage of the filter, the fluid pressure at the input end of the core 105 will continuously increase. When the fluid pressure increases to the point that it can overcome the elastic restoring force of the pre-compression spring 104 and cause the pre-compression spring 104 to be further compressed, the peripheral end face of the core input port 105a will disengage from the cylindrical shell sealing wall 102b. At this time, the bypass channel 102c is connected to the fluid input chamber 101a.

[0065] In one embodiment (not shown), the pre-tension spring is a pre-stretch spring. The peripheral wall of the fluid input cavity 101a may be formed with an annular stepped surface facing the core input port 105a. The axial ends of the pre-stretch spring are elastically pressed against the annular stepped surface and the peripheral end face of the core input port 105a, respectively. When the filter structure intercepts large-sized impurities, resulting in insufficient fluid flow or direct blockage of the filter, the fluid pressure on the input end of the core 105 will continuously increase. When the fluid pressure increases to the point that it can overcome the elastic restoring force of the pre-stretch spring and cause the pre-stretch spring to stretch further, the peripheral end face of the core input port 105a will disengage from the cylindrical shell sealing wall 102b. At this time, the bypass channel 102c is connected to the fluid input cavity 101a.

[0066] In one embodiment, the peripheral end face of the core input port 105a and the cylindrical shell sealing wall 102b are both formed as sealing cone surfaces, which can further enhance the sealing effect. When the peripheral end face of the core input port 105a is disengaged from the cylindrical shell sealing wall 102b and the bypass flow channel 102c is connected to the fluid input cavity 101a, the cone shape of the cylindrical shell sealing wall 102b plays a guiding role, adjusting the flow direction of the fluid after it flows out of the fluid input cavity 101a to be towards the bypass flow channel inlet 102d.

[0067] In one embodiment, the housing assembly includes a housing body 102 and an input connector and an output connector connected to the axial ends of the housing body 102. A fluid input chamber 101a is formed within the input connector, a fluid filtering chamber 102a is formed within the housing body 102, and a fluid output chamber 103a is formed within the output connector. The specific structures of the input and output connectors can be adjusted according to the actual installation scenario of the filter valve 100. For example, if the filter valve 100 needs to be installed in a hydraulic system, by adjusting the specific structures of the input and output connectors, the filter valve 100 can be adapted to be connected in series in a hydraulic pipeline, adapted to connect a hydraulic pipeline and a hydraulic component, or adapted to connect two adjacent hydraulic components.

[0068] In one embodiment, both the input and output connectors are configured as quick-connect fittings that allow the filter valve 100 to be quickly installed into an external structure, facilitating assembly and disassembly and improving efficiency. For example, the input connector may be a compression fitting 101 integrally formed with the housing body 102, and the output connector may be a straight-through connector 103 detachably connected to the housing body 102. With this connector structure, both ends of the filter valve 100 can be quickly connected to and disconnected from hydraulic lines and hydraulic components, respectively.

[0069] In one embodiment, a sealing gasket 107 is provided between the end straight connector 103 and the column housing body 102, which can improve the airtightness of the filter valve 100 and effectively prevent fluid leakage.

[0070] Furthermore, a second exemplary embodiment of the present invention also provides a hydraulic system (e.g., a hydraulic system in agricultural machinery or construction machinery) equipped with the aforementioned filter valve 100, and a third exemplary embodiment of the present invention also provides an agricultural machine (e.g., a harvester) equipped with the aforementioned hydraulic system. Obviously, since both the hydraulic system and the agricultural machine are equipped with the filter valve 100, they should also possess all the technical effects brought about by the filter valve 100, and therefore will not be elaborated upon here.

[0071] It is understood that the filter valve 100 of the present invention is applicable to the field of fluid filtration, and therefore applying the filter valve 100 of the present invention to the field of gas filtration should not exceed the scope of the present invention.

[0072] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0073] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0074] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A filter valve, characterized in that, The filter valve (100) includes: The cylindrical shell assembly has a fluid inlet chamber (101a), a fluid filter chamber (102a) and a fluid outlet chamber (103a) connected sequentially along the axial direction. The connection between the peripheral wall of the fluid inlet chamber (101a) and the peripheral wall of the fluid filter chamber (102a) forms a cylindrical shell sealing wall surface (102b) facing the fluid filter chamber (102a). The filter element mechanism includes a preload spring, a core (105) coaxially disposed within the fluid filtration chamber (102a), and a filter screen structure disposed within the core (105). The core (105) has a core input port (105a) communicating with the fluid input chamber (101a) and a core output port (105b) communicating with the fluid output chamber (103a) at its axial ends, respectively. The core (105) is able to maintain a tendency to form a sealing contact between the peripheral end face of the core input port (105a) and the cylindrical shell sealing wall surface (102b) under the elastic restoring force of the preload spring; and A bypass channel (102c) is formed between the peripheral wall of the core (105) and the peripheral wall of the fluid filter chamber (102a) and is in communication with the fluid output chamber (103a). When the sealing pressure is not formed, the bypass channel (102c) is in communication with the fluid input chamber (101a). When the sealing pressure is formed, the bypass channel (102c) is cut off from the fluid input chamber (101a). The filter structure includes a filter screen cover (106) sleeved inside the core (105). The filter screen cover (106) has a cover opening and an end face filter at its two axial ends, respectively. The cover opening is positioned facing the core input port (105a). The peripheral wall of the core (105) is formed with a second core flow hole (105d), which is connected to the bypass channel (102c). The peripheral wall of the filter screen cover (106) is formed with a peripheral wall filter screen covering the second core flow hole (105d). The peripheral wall of the core (105) is formed with a first core flow hole (105c). The bypass channel (102c), the first core flow hole (105c), the core output port (105b) and the fluid output chamber (103a) are connected in sequence. The filter structure is disposed between the first core flow hole (105c) and the core input port (105a).

2. The filter valve according to claim 1, characterized in that, The bypass channel (102c) has a bypass channel inlet (102d) and a bypass channel outlet (102e) formed at its two axial ends, respectively. The bypass channel outlet (102e), the fluid filter chamber (102a) are connected sequentially in the region between the core output port (105b) and the fluid output chamber (103a) and the fluid output chamber (103a).

3. The filter valve according to claim 1, characterized in that, The inner circumferential wall of the core (105) is formed with an annular protrusion (105e), and the filter structure is disposed between the annular protrusion (105e) and the core input port (105a). The filter structure and the annular protrusion (105e) are connected along the axial direction of the core (105).

4. The filter valve according to claim 3, characterized in that, The filter structure is detachably installed inside the core (105), and the filter structure and the annular protrusion (105e) are axially limited and abutted against each other along the core (105).

5. The filter valve according to claim 1, characterized in that, The pre-tension spring is a pre-compression spring (104). The peripheral wall of the fluid output cavity (103a) is formed with an annular stepped portion (103b) facing the core output port (105b). The two axial ends of the pre-compression spring (104) are elastically pressed against the stepped surface of the annular stepped portion (103b) and the peripheral end face of the core output port (105b), respectively.

6. The filter valve according to claim 1, characterized in that, The peripheral end face of the core input port (105a) and the sealing wall surface of the cylindrical shell (102b) are both formed as sealing cone surfaces.

7. The filter valve according to claim 1, characterized in that, The cylindrical housing assembly includes a cylindrical housing body (102) and an input connector and an output connector connected to both axial ends of the cylindrical housing body (102). The fluid input chamber (101a) is formed in the input connector, the fluid filter chamber (102a) is formed in the cylindrical housing body (102), and the fluid output chamber (103a) is formed in the output connector.

8. The filter valve according to claim 7, characterized in that, Both the input connector and the output connector are configured as quick-install connectors that allow the filter valve (100) to be quickly installed into an external structure.

9. The filter valve according to claim 8, characterized in that, The input connector is formed as a compression fitting (101) integrally formed with the cylindrical shell body (102), and the output connector is formed as a straight-through connector (103) detachably connected to the cylindrical shell body (102).

10. The filter valve according to claim 9, characterized in that, A sealing gasket (107) is provided between the end straight connector (103) and the cylindrical shell body (102).

11. A hydraulic system, characterized in that, The hydraulic system includes a filter valve (100) according to any one of claims 1 to 10.

12. An agricultural machine, characterized in that, The agricultural machinery includes the hydraulic system according to claim 11.

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