One-way filter valve, hydraulic control system and mechanical device

Abstract

The application relates to a one-way filtering valve, a hydraulic control system and a mechanical device, wherein the one-way filtering valve comprises a first valve port and a second valve port, the direction of the first valve port pointing to the second valve port is a first direction; a filtering screen is arranged between the first valve port and the second valve port; a filtering switch is suitable for controlling the opening and closing of the clearance on one side of the filtering screen; when liquid flows in the first direction, the clearance is closed, and the liquid flows to the second valve port through the filtering screen; when the liquid flows in a second direction, the clearance is opened, and the liquid flows to the first valve port through the clearance, wherein the second direction is opposite to the first direction. When the liquid flows in the first direction, the clearance is closed, the filtering screen can filter the impurities in the liquid flowing in the first direction, and the impurity content in the liquid flowing to the second valve port is reduced; when the liquid flows in the second direction, the clearance is opened, and the impurities in the liquid flowing in the second direction can be discharged through the clearance, so that the probability of the impurities blocking in the hydraulic system to cause system failure is reduced.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control, and in particular to a one-way filter valve, a hydraulic control system, and mechanical equipment. Background Technology

[0002] Hydraulic actuators are the power output end of a hydraulic system. They receive pressurized oil from a hydraulic pump, convert hydraulic energy into mechanical energy, and drive the load to perform linear / rotational motion. Common hydraulic actuators include hydraulic cylinders and hydraulic motors.

[0003] Hydraulic valves are the control center of hydraulic systems, precisely regulating the actions of actuators by controlling the pressure, flow, and direction of the fluid. When hydraulic actuators are equipped with hydraulic valves, especially safety components such as balance valves, the most critical factor is that impurities in the fluid must not clog the hydraulic valves.

[0004] However, current hydraulic control systems still have shortcomings. Utility Model Content

[0005] The problem this invention addresses is how to improve the hydraulic control system, reduce the probability of impurities in the liquid causing hydraulic valves to become stuck, and improve the stability of the hydraulic control system.

[0006] To address the aforementioned problems, this utility model provides a one-way filter valve, comprising: a first valve port and a second valve port, wherein the direction from the first valve port to the second valve port is a first direction; a filter screen located between the first valve port and the second valve port; and a filter switch adapted to control the opening and closing of a gap on one side of the filter screen. When liquid flows along the first direction, the gap is closed, and the liquid flows through the filter screen to the second valve port. When liquid flows along a second direction, the gap is opened, and the liquid flows through the gap to the first valve port. The second direction is opposite to the first direction.

[0007] Optionally, the filter switch includes: a closing portion adapted to contact or separate from the filter screen to close or open a gap on one side of the filter screen; and an elastic portion adapted to contact the closing portion and to undergo elastic deformation to contact or separate the closing portion from the filter screen.

[0008] Optionally, the filter switch further includes a flow guide portion located on the side of the elastic portion close to the closure portion along the second direction, and the flow guide portion extending and connected to the closure portion.

[0009] Optionally, the flow guide is a conical structure and the cone apex of the flow guide faces the second valve port.

[0010] Optionally, the flow guide is located between the elastic part and the second valve port.

[0011] Optionally, the filter switch further includes: an elastic part base, the elastic part base being fixed to the inner wall of the one-way filter valve housing, the elastic part base being disposed on the side of the elastic part away from the flow guide, and the elastic part base being adapted to be connected to the elastic part.

[0012] Optionally, the elastic base has a through hole.

[0013] Optionally, it also includes: a filter screen base, the filter screen base being fixed to the inner wall of the one-way filter valve housing, one end of the filter screen being fixed to the filter screen base, and the other end being in contact with the closing part of the filter switch.

[0014] Accordingly, the present invention provides a hydraulic control system, comprising: a main valve and an actuator; a hydraulic valve connected in an oil line between the main valve and the actuator; and a one-way filter valve as described in any of the above, connected in an oil line between the main valve and the hydraulic valve.

[0015] Optionally, the hydraulic valve includes a balance valve; the actuator includes a cylinder.

[0016] Optionally, it also includes: an oil tank and a return oil filter, wherein the oil tank is adapted to be connected to the actuator, the return oil filter is adapted to filter impurities in the liquid in the oil circuit, and the oil tank is adapted to receive the liquid filtered by the return oil filter.

[0017] Accordingly, the present invention provides a mechanical device, including: a hydraulic control system as described in any of the above claims.

[0018] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0019] In the one-way filter valve of this utility model, when the liquid flows in the first direction, the gap is closed, and the filter screen can filter impurities in the liquid flowing in the first direction, blocking the impurities outside the filter screen and reducing the impurity content in the liquid flowing to the second valve port. When the liquid flows in the second direction, the gap is opened, and the impurities in the liquid flowing in the second direction will not block the filter screen and the filter switch. The impurities in the liquid flowing in the second direction can be discharged through the gap. Furthermore, the liquid flowing in the second direction can carry the impurities blocked outside the filter screen to the first valve port, reducing the probability of impurities blocking the hydraulic system and causing system failure, and improving the stability of the system.

[0020] In an optional embodiment of this utility model, the filter switch includes: a closing portion adapted to contact or separate from the filter screen to close or open a gap on one side of the filter screen; and an elastic portion adapted to contact the closing portion and to undergo elastic deformation to allow the closing portion to contact or separate from the filter screen. The elastic portion's ability to undergo elastic deformation to allow the closing portion to contact or separate from the filter screen enables the closing and opening of the gap on one side of the filter screen. When the liquid flows in the first direction, the elastic part undergoes elastic deformation, causing the closed part to contact the filter screen. The gap on one side of the filter screen closes, and the liquid flows through the filter screen, while impurities in the liquid are blocked outside the filter screen. When the liquid flows in the second direction, the elastic part undergoes elastic deformation, causing the closed part to separate from the filter screen. The gap on one side of the filter screen opens, and the liquid flows through the gap. Impurities in the liquid can be discharged through the gap, and impurities blocked outside the filter screen can flow with the liquid flowing in the second direction to the first valve port. This reduces the impurity content in the system, lowers the probability of impurities clogging the hydraulic system and causing system failure, and improves the stability of the system.

[0021] In an optional embodiment of this invention, the flow guide is a conical structure with its cone apex facing the second valve port. The flow guide has an inclined surface, preventing impurities in the liquid flowing in the second direction from accumulating between the filter screen and the filter switch. Instead, impurities flow through the inclined surface of the flow guide and are discharged through the gaps on one side of the filter screen, reducing the probability of impurities clogging the hydraulic system and causing system failure, thus improving system stability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the one-way filter valve according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the filter switch according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the one-way filter valve when the filter switch is turned on according to an embodiment of the present invention. Detailed Implementation

[0025] As can be seen from the background technology, current hydraulic control systems still have shortcomings. The reasons for these shortcomings are analyzed below:

[0026] When a hydraulic actuator is equipped with a hydraulic valve, especially a safety component such as a balance valve, the most critical thing is that there must be no impurities in the liquid that can jam the hydraulic valve. Jammed valves will prevent the hydraulic valve from closing and affect the stability of the hydraulic system.

[0027] The balance valve is connected to the oil line between the main valve and the oil cylinder. Impurities in the oil line may originate from upstream of the balance valve, such as the oil tank, pump, or multi-way valve, or from impurities that detach from within the oil cylinder. If no filter is added to the oil line, impurities may enter the balance valve and oil cylinder, causing valve jamming. If a filter is added upstream of the balance valve, impurities detached from the oil cylinder will remain inside during oil return, significantly increasing the likelihood of jamming. Adding filters both upstream and downstream of the balance valve greatly reduces the probability of impurities jamming the valve, but impurities detached from the oil cylinder cannot be discharged. These impurities remain trapped inside the oil cylinder, causing repeated flushing and damage to the actuator (e.g., the oil cylinder itself). Furthermore, impurities that cannot be discharged during oil return may clog the filter (e.g., the filter screen), reducing the oil flow area and eventually damaging the filter over time.

[0028] To solve the aforementioned technical problem, this utility model provides a one-way filter valve, comprising: a first valve port and a second valve port, wherein the direction from the first valve port to the second valve port is a first direction; a filter screen located between the first valve port and the second valve port; and a filter switch adapted to control the opening and closing of a gap on one side of the filter screen. When liquid flows along the first direction, the gap is closed, and the liquid flows through the filter screen to the second valve port. When liquid flows along a second direction, the gap is opened, and the liquid flows through the gap to the first valve port. The second direction is opposite to the first direction.

[0029] In the one-way filter valve of this utility model, when the liquid flows in the first direction, the gap is closed, and the filter screen can filter impurities in the liquid flowing in the first direction, blocking the impurities outside the filter screen and reducing the impurity content in the liquid flowing to the second valve port. When the liquid flows in the second direction, the gap is opened, and the impurities in the liquid flowing in the second direction will not block the filter screen and the filter switch. The impurities in the liquid flowing in the second direction can be discharged through the gap. Furthermore, the liquid flowing in the second direction can carry the impurities blocked outside the filter screen to the first valve port, reducing the probability of impurities blocking the hydraulic system and causing system failure, and improving the stability of the system.

[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] Please refer to Figure 1 The one-way filter valve includes a first valve port 1 and a second valve port 2, wherein the direction from the first valve port 1 to the second valve port 2 is a first direction V1.

[0032] The first valve port 1 is suitable for connection to one of the main valve and the hydraulic valve, and the second valve port 2 is suitable for connection to the other of the main valve and the hydraulic valve. Specifically, in some embodiments of this utility model, the one-way filter valve is connected in the oil circuit between the main valve and the hydraulic valve, where the hydraulic valve is a balance valve. The first valve port 1 is suitable for connection to the main valve, and the second valve port 2 is suitable for connection to the balance valve. The one-way filter valve is suitable for filtering the liquid from the main valve and then supplying it to the balance valve, thereby reducing impurities in the liquid flowing to the balance valve and lowering the probability of the balance valve jamming.

[0033] Please continue to refer to this. Figure 1 The direction from the first valve port 1 to the second valve port 2 is the first direction V1. When the liquid flows from the first valve port 1 to the second valve port 2, that is, the liquid flows along the first direction V1.

[0034] For example, in some embodiments of this utility model, in the oil inlet circuit, the oil flows from the oil tank to the main valve, from the main valve to the first valve port 1, and from the first valve port 1 to the second valve port 2; in the oil return circuit, the oil flows from the balance valve to the second valve port 2, and from the second valve port 2 to the first valve port 1.

[0035] Please continue to refer to this. Figure 1 The one-way filter valve includes a filter screen 3, which is located between the first valve port 1 and the second valve port 2.

[0036] The filter screen 3 is suitable for filtering impurities in the liquid to isolate them from the outside of the filter screen 3, thereby reducing the impurity content in the liquid.

[0037] For example, in some embodiments of this utility model, in the oil inlet circuit, the oil flows from the first valve port 1 to the filter screen 3 and then to the second valve port 2. The filter screen 3 isolates impurities in the oil flowing along the first direction V1 outside the filter screen 3, thereby reducing the impurity content of the oil delivered to the second valve port 2.

[0038] Specifically, the filter screen 3 extends along the second valve port 2 towards the first valve port 1. This increases the contact area between the liquid and the filter screen 3, enhances the liquid's flow capacity, and reduces the liquid's flow pressure loss.

[0039] For example, in some embodiments of this utility model, in the oil inlet circuit, the oil flows from the first valve port 1 to the filter screen 3 and then to the second valve port 2. The filter screen 3 extends along the second valve port 2 in the direction pointing to the first valve port 1. The filter screen 3 has a large contact area with the oil, which improves the flow capacity of the oil flowing along the first direction V1 and reduces the flow pressure loss of the oil.

[0040] Please continue to refer to this. Figure 1 The one-way filter valve includes a filter switch 4, which is adapted to control the opening and closing of the gap on one side of the filter screen 3. When the liquid flows along the first direction V1, the gap is closed and the liquid flows through the filter screen 3 to the second valve port 2. When the liquid flows along the second direction V2, the gap is opened and the liquid flows through the gap to the first valve port 1. The second direction V2 is opposite to the first direction V1.

[0041] When the liquid flows along the first direction V1, the gap is closed, preventing the liquid from flowing to the second valve port 2. Instead, the liquid flows to the second valve port 2 through the filter screen 3. The filter screen 3 filters impurities in the liquid flowing along the first direction V1, blocking them outside the filter screen 3 and reducing the impurity content in the liquid flowing to the second valve port 2. When the liquid flows along the second direction V2, the gap opens, allowing the liquid flowing along the second direction V2 to flow to the first valve port 1. Impurities in the liquid flowing along the second direction V2 will not clog between the filter screen 3 and the filter switch 4, allowing impurities in the liquid flowing along the second direction V2 to be discharged through the gap. Furthermore, the liquid flowing along the second direction V2 can carry impurities blocked outside the filter screen 3 to the first valve port 1, reducing the probability of impurities clogging the hydraulic system and causing system failure, thus improving system stability.

[0042] For example, in some embodiments of this utility model, in the oil inlet circuit, the oil flows through the main valve to the first valve port 1, through the first valve port 1 to the second valve port 2, through the second valve port 2 to the balance valve, and then through the balance valve to the oil cylinder. That is, the oil flows along the first direction V1. At this time, the gap is closed, and the oil cannot flow through the gap to the second valve port 2. The oil can only flow through the filter screen 3 to the second valve port 2. The filter screen 3 can filter impurities in the liquid flowing along the first direction V1, blocking the impurities outside the filter screen 3, reducing the impurity content in the liquid flowing to the second valve port 2, thereby reducing the impurity content in the oil inlet circuit. In the oil return circuit, the oil flows through the balance valve to the second valve port 2, through the second valve port 2 to the first valve port 1, and then through the first valve port 1 to the oil tank. That is, the oil flows along the second direction V2. At this time, the gap is open, and the impurities in the oil can be discharged through the gap.

[0043] Please refer to the reference. Figure 1 and Figure 2 The filter switch 4 includes a closing part 5, which is adapted to contact or separate from the filter screen 3 to close or open the gap on one side of the filter screen 3;

[0044] The elastic part 6 is adapted to contact the closed part 5 and is adapted to produce elastic deformation so that the closed part 5 contacts or separates from the filter screen 3.

[0045] When the closed part 5 contacts the filter screen 3, the filter switch 4 is closed; when the closed part 5 separates from the filter screen 3, the filter switch 4 is opened.

[0046] The elastic part 6 is adapted to undergo elastic deformation to allow the closing part 5 to contact or separate from the filter screen 3, thereby closing and opening the gap on one side of the filter screen 3. When the liquid flows along the first direction V1, the elastic part 6 undergoes elastic deformation, causing the closing part 5 to contact the filter screen 3, closing the gap on one side of the filter screen 3, allowing the liquid to flow through the filter screen 3, and blocking impurities in the liquid outside the filter screen 3. When the liquid flows along the second direction V2, the elastic part 6 undergoes elastic deformation, causing the closing part 5 to separate from the filter screen 3, opening the gap on one side of the filter screen 3, allowing the liquid to flow through the gap, and allowing impurities in the liquid to be discharged through the gap. Furthermore, impurities blocked outside the filter screen 3 can flow with the liquid flowing along the second direction V2 towards the first valve port 1, reducing the impurity content in the system, lowering the probability of impurities clogging the hydraulic system and causing system failure, and improving the stability of the system.

[0047] Specifically, please refer to some embodiments of this utility model. Figure 1 When no oil flows through the one-way filter valve, that is, when the elastic part 6 is in the initial state, the closing part 5 contacts the filter screen 3, and the gap on one side of the filter screen 3 is closed.

[0048] Please continue to refer to this. Figure 1 When the oil flows along the first direction V1, under the action of the oil pressure, the closed part 5 is in close contact with the filter screen 3, and the gap on one side of the filter screen 3 is continuously closed;

[0049] Please refer to Figure 3 When the oil flows along the second direction V2, and the product of the oil pressure and the channel area of ​​the filter screen 3 is greater than the elastic force of the elastic part 6, the oil causes the elastic part 6 to undergo compression deformation, and the closing part 5 is pushed in the second direction V2. The closing part 5 separates from the filter screen 3, thereby opening the gap on one side of the filter screen 3. The channel area of ​​the filter screen 3 is the cross-sectional area of ​​the filter screen 3 in the plane perpendicular to the first direction V1.

[0050] Specifically, in some embodiments of this utility model, the elastic part 6 includes a spring.

[0051] Specifically, in some embodiments of this utility model, along the radial direction of the one-way filter valve housing, the distance d1 between the end face of the closed portion 5 near the one-way filter valve housing and the inner wall of the one-way filter valve housing is greater than 0, i.e., d1 > 0. This allows the liquid flowing along the first direction V1 to flow through the gap between the closed portion 5 and the inner wall of the one-way filter valve housing to the filter screen 3.

[0052] The filter switch 4 further includes a flow guide 7, which is located on the side of the elastic part 6 along the second direction V2 near the closing part 5, and the flow guide 7 extends and is connected to the closing part 5.

[0053] That is, along the second direction V2, the elastic part 6 has a side close to the closing part 5 and a side away from the closing part 5, the guide part 7 is located on the side of the elastic part 6 close to the closing part 5, and the guide part 7 extends and connects to the closing part 5.

[0054] The flow guide 7 extends and connects to the closing part 5, so that the liquid flowing in from the first valve port 1 cannot flow to the second valve port 2 through any other location except the filter screen 3, so that impurities in the liquid flowing along the first direction V1 are blocked outside the filter screen 3, thereby reducing the impurity content in the liquid flowing to the second valve port 2.

[0055] Specifically, please refer to some embodiments of this utility model. Figure 1 The flow guide 7 has a conical structure, with the apex of the cone facing the second valve port 2. The flow guide 7 has an inclined surface, ensuring that impurities in the liquid flowing along the second direction V2 do not accumulate between the filter screen 3 and the filter switch 4. Instead, they flow through the inclined surface of the flow guide 7 and are discharged through the gaps on one side of the filter screen 3, reducing the probability of impurities clogging the hydraulic system and causing system failure, thus improving system stability.

[0056] Specifically, in some embodiments of this utility model, please refer to the references. Figure 1 and Figure 2 The flow guide 7 is located between the elastic part 6 and the second valve port 2.

[0057] Please refer to the following: Figure 1 and Figure 2 The filter switch 4 further includes: an elastic part base 8, which is fixed to the inner wall of the one-way filter valve housing. The elastic part base 8 is located on the side of the elastic part 6 away from the flow guide part 7, and the elastic part base 8 is adapted to be connected to the elastic part 6.

[0058] One end of the elastic part 6 is adapted to be connected to the elastic part base 8, and the other end of the elastic part 6 is adapted to contact the closing part 5. The elastic part base 8 is connected to the elastic part 6 to fix one end of the elastic part 6.

[0059] For details, please continue to refer to [the website / information]. Figure 1 The elastic base 8 has a through hole. The hole provides a structural basis for conveying liquid. When the liquid flows in the first direction V1, the hole allows the liquid flowing from the first valve port 1 to flow through the hole to the second valve port 2. When the liquid flows in the second direction V2, the hole allows impurities in the liquid flowing in the second direction V2 to flow through the hole and then to the first valve port 1.

[0060] For example, in some embodiments of this utility model, in the oil inlet circuit, the oil flows along the first direction V1 from the main valve through the one-way filter valve to the balance valve and then to the oil cylinder. The orifice allows the oil from the first valve port 1 to flow through the orifice to the second valve port 2. In the oil return circuit, the oil flows through the balance valve to the second valve port 2, then to the first valve port 1, and then to the oil tank. The orifice allows the oil from the second valve port 2 and impurities in the oil to be discharged through the orifice.

[0061] Please continue to refer to this. Figure 1 The one-way filter valve further includes a filter screen base 9, which is fixed to the inner wall of the one-way filter valve housing. One end of the filter screen 3 is fixed to the filter screen base 9, and the other end is in contact with the closing part 5 of the filter switch 4.

[0062] The filter base 9 is adapted to fix the filter 3. Specifically, when the filter 3 needs to be replaced, the filter base 9 and the filter 3 can be removed from the one-way filter valve housing to replace the filter base 9 and the filter 3, reducing the cost of replacement parts.

[0063] Accordingly, this utility model also provides a hydraulic control system, including: a main valve and an actuator; a hydraulic valve connected in an oil line between the main valve and the actuator; and a one-way filter valve as described in this utility model, the one-way filter valve connected in an oil line between the main valve and the hydraulic valve.

[0064] Specifically, in some embodiments of this utility model, the hydraulic valve includes a balance valve; the actuator includes a hydraulic cylinder.

[0065] In the hydraulic control system of this invention, even if impurities fall out of the actuator (e.g., oil cylinder), they can still be discharged from the system through the one-way filter valve described in this invention. This reduces the probability of impurities clogging the hydraulic system and causing system failure, thus improving system stability. Specifically, in the return oil circuit, impurities falling out of the actuator can be discharged through the gap opened on one side of the filter screen 3.

[0066] The hydraulic control system further includes an oil tank and a return oil filter. The oil tank is adapted to be connected to the actuator, the return oil filter is adapted to filter impurities in the liquid in the oil circuit, and the oil tank is adapted to receive the liquid filtered by the return oil filter.

[0067] Specifically, in some embodiments of this utility model, in the oil inlet circuit, the oil flows from the oil tank to the main valve, from the main valve to the first valve port 1 of the one-way filter valve, from the first valve port 1 to the second valve port 2, from the second valve port 2 to the balance valve, and from the balance valve to the oil cylinder.

[0068] In the return oil circuit, the oil flows through the balance valve to the second valve port 2 of the one-way filter valve, then through the second valve port 2 to the first valve port 1, and finally through the first valve port 1 to the return oil filter. After being filtered by the return oil filter, the oil is collected in the oil tank. At this time, impurities in the oil flowing along the second direction V2, as well as impurities blocked outside the filter screen 3, can be filtered by the return oil filter, allowing impurities in the hydraulic control system to be discharged and reducing the impurities in the oil in the oil tank.

[0069] Accordingly, this utility model also provides a mechanical device, including: a hydraulic control system as described in this utility model.

[0070] In summary, when the liquid flows along the first direction V1, the gap is closed, and the filter screen 3 can filter impurities in the liquid flowing along the first direction V1, blocking the impurities outside the filter screen 3 and reducing the impurity content in the liquid flowing to the second valve port 2. When the liquid flows along the second direction, the gap is open, and impurities in the liquid flowing along the second direction V2 will not clog between the filter screen 3 and the filter switch 4. Impurities in the liquid flowing along the second direction V2 can be discharged through the gap. Furthermore, the liquid flowing in the second direction V2 can carry the impurities blocked outside the filter screen 3 to the first valve port 1, reducing the probability of impurities clogging the hydraulic system and causing system failure, and improving the stability of the system. In addition, the guide part 7 has a conical structure and the cone apex of the guide part 7 faces the second valve port 2. The flow guide 7 has an inclined surface, which prevents impurities in the liquid flowing along the second direction V2 from accumulating between the filter screen 3 and the filter switch 4. Instead, the impurities flow through the inclined surface of the flow guide 7 and are discharged through the gap on one side of the filter screen 3, reducing the probability of impurities clogging the hydraulic system and causing system failure, and improving the stability of the system.

[0071] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A one-way filter valve, characterized in that, include: A first valve port and a second valve port, wherein the direction from the first valve port to the second valve port is the first direction; A filter screen located between the first valve port and the second valve port; A filter switch is adapted to control the opening and closing of a gap on one side of a filter screen. When the liquid flows in a first direction, the gap is closed, and the liquid flows through the filter screen to the second valve port. When the liquid flows in a second direction, the gap is opened, and the liquid flows through the gap to the first valve port. The second direction is opposite to the first direction.

2. The one-way filter valve as described in claim 1, characterized in that, The filter switch includes: A closing portion, the closing portion being adapted to contact or separate from the filter screen to close or open the gap on one side of the filter screen; An elastic portion is provided, which is adapted to contact the closed portion and is adapted to undergo elastic deformation to cause the closed portion to contact or separate from the filter screen.

3. The one-way filter valve as described in claim 2, characterized in that, The filter switch also includes: A flow guide is located on the side of the elastic portion close to the closure portion along the second direction, and the flow guide extends and connects to the closure portion.

4. The one-way filter valve as described in claim 3, characterized in that, The flow guide has a conical structure and the cone apex of the flow guide faces the second valve port.

5. The one-way filter valve as described in claim 4, characterized in that, The flow guide is located between the elastic part and the second valve port.

6. The one-way filter valve as described in claim 3, characterized in that, The filter switch further includes: an elastic part base, the elastic part base being fixed to the inner wall of the one-way filter valve housing, the elastic part base being disposed on the side of the elastic part away from the flow guide part, and the elastic part base being adapted to be connected to the elastic part.

7. The one-way filter valve as described in claim 6, characterized in that, The elastic base has a through hole.

8. The one-way filter valve as described in claim 2, characterized in that, Also includes: A filter screen base is fixed to the inner wall of the one-way filter valve housing. One end of the filter screen is fixed to the filter screen base, and the other end is in contact with the closed part of the filter switch.

9. A hydraulic control system, characterized in that, include: Main valve and actuator; A hydraulic valve, wherein the hydraulic valve is connected in the oil line between the main valve and the actuator; The one-way filter valve as described in any one of claims 1 to 8, wherein the one-way filter valve is connected in the oil line between the main valve and the hydraulic valve.

10. The hydraulic control system as described in claim 9, characterized in that, The hydraulic valve includes a balance valve; the actuator includes a hydraulic cylinder.

11. The hydraulic control system as described in claim 10, characterized in that, Also includes: An oil tank and a return oil filter are provided, wherein the oil tank is adapted to be connected to the actuator, the return oil filter is adapted to filter impurities in the liquid in the oil circuit, and the oil tank is adapted to receive the liquid filtered by the return oil filter.

12. A mechanical device, characterized in that, include: The hydraulic control system as described in any one of claims 9 to 11.

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