Integral two-position three-way logic control unloading valve

Abstract

The invention discloses an integral two-position three-way logic control unloading valve which comprises an active unloading valve and a two-position three-way electromagnetic valve which are integrated into a whole. The active unloading valve comprises a first valve body, a first valve element is arranged in the first valve body in a sliding mode, a back containing cavity is formed in the tail end of the first valve element, an oil inlet P3 and an oil return port T3 are further formed in the active unloading valve, and the oil inlet P3 is communicated with the back containing cavity. The two-position three-way electromagnetic valve comprises a second valve body, the second valve body is fixedly inserted into the first valve body, the end of the second valve body is inserted into the back containing cavity in the first valve element, the two-position three-way electromagnetic valve is further provided with an oil inlet P2, a working port A2 and an oil return port T2, and the working port A2 communicates with the back containing cavity; the integrated unloading valve bank can be well applied to the tail end of a neutral-position unloading oil way of a neutral-position unloading core-opening multi-way valve system, so that the whole hydraulic system builds system pressure, and the integrated unloading valve bank has an energy level state capable of recovering operation.

Description

Technical Field

[0001] This invention relates to an integrated two-position three-way logic-controlled unloading valve. Background Technology

[0002] In a multi-way hydraulic system, when the valves are in the neutral position, the pressurized oil is unloaded to the return tank at near zero pressure through a logic structure with hydraulic oil unloading function in the neutral position. This design has a flaw: once each circuit returns to the neutral position, the hydraulic system's energy is in a low-energy state. Without external mechanical action, there is no other way to restore the system to a working state, i.e., a high-energy state.

[0003] To address this issue, a common practice is to connect a back pressure valve in series in the neutral unloading circuit. This raises the hydraulic system's unloading return pressure from near zero to a pressure sufficient to start the system, typically several MPa. However, this prevents the hydraulic system from unloading at near-zero pressure when not in operation, instead requiring unloading at several megapascals – a process known as pressure unloading. This results in increased heat generation, unnecessarily high energy consumption, and wasted resources. To solve this problem, this application designs an integrated two-position three-way logic control unloading valve suitable for neutral unloading open-ended multi-way valve systems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: an integrated two-position three-way logic control unloading valve, including an integrated active unloading valve and a two-position three-way solenoid valve; The active unloading valve includes a valve body 1, which has an oil inlet P3 and an oil return port T3. A valve core 1, which connects or disconnects the oil passage between the oil inlet P3 and the oil return port T3, is slidably disposed within the valve body 1. The tail end of the valve core 1 has a back cavity, and the oil inlet P3 is also connected to the back cavity through a throttling port. The two-position three-way solenoid valve includes a valve body 2, which is inserted and fixed within the valve body 1, with its head sealed and inserted into the back cavity within the valve core 1. The two-position three-way solenoid valve has an oil inlet P2, a working port A2, and an oil return port T2. The valve body has an oil port B that communicates with the oil return port T2 and an oil port C that communicates with the oil inlet P2. A valve core 2 is slidably disposed inside the valve body 2. The valve core 2 has an oil port A that communicates with the working port A2. The valve core 2 slidably alternately opens and closes the oil passage between oil port A and oil port B, and the oil passage between oil port A and oil port C. The working port A2 is located inside the valve body 2 and communicates with the back cavity. When the two-position three-way solenoid valve is not energized, the oil passage between port A and port B is connected, that is, the oil passage between working port A2 and return port T2 is connected. The back cavity is connected to the return oil tank through working port A2 and return port T2. The back cavity can be unloaded by the two-position three-way solenoid valve. The valve core can connect the oil passage between inlet port P3 and return port T3 to unload. When the two-position three-way solenoid valve is energized, the oil passage between port A and port C is connected, that is, the inlet port P2 is connected to working port A2. The oil can build back pressure in the back cavity. The valve core can disconnect the oil passage between inlet port P3 and return port T3.

[0005] As a preferred technical solution, the inner circumference of the tail end of the valve body one is provided with a threaded section one, the valve body two is inserted into the tail end of the valve body one, and the valve body two is connected to the threaded section one.

[0006] As a preferred technical solution, the tail end of the valve body is connected to a tail seat, and the outer periphery of the tail seat is provided with a threaded section.

[0007] As a preferred technical solution, the oil inlet P3 is located at the head end of the valve body, and the oil return port T3 is located on the side of the valve body. The valve core slides along the valve body to connect or disconnect the oil passage between the oil inlet P3 and the oil return port T3.

[0008] As a preferred technical solution, a spring for controlling the sliding of the valve core is installed in the back cavity, and the two ends of the spring abut against the valve core and the valve body.

[0009] As a preferred technical solution, the throttling port is located on the valve core to connect the oil inlet P3 with the back cavity inside the active unloading valve.

[0010] As a preferred technical solution, the throttling port is located on the valve seat outside the valve body, connecting the oil inlet P3 with the back cavity outside the active unloading valve.

[0011] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: This application provides an integrated unloading valve assembly, which is applied to the end of the mid-position unloading oil circuit of an open-core system. Its structure includes an integrated active unloading valve and a two-position three-way solenoid valve. The back cavity of the active unloading valve is connected to the return oil cavity. The hydraulic oil in the back cavity is pressureless, the active unloading valve is open, and the active unloading valve is in a near-zero pressure conduction state, so that the multi-way valve hydraulic system is in a near-zero pressure unloading state. When an electrical signal is input, the system pressure oil in the multi-way valve will flow through the two-position three-way solenoid valve to the return oil cavity. Oil enters the back cavity of the active unloading valve, and some oil continues to enter the back cavity of the active unloading valve through the throttle orifice. As more oil enters the back cavity, pressure is built up, closing the active unloading valve, that is, closing the unloading circuit, so that the entire hydraulic system builds up system pressure and has the energy potential to resume operation. If no work is required, the electrical signal will be canceled, the back cavity of the active unloading valve will be in the released state, the hydraulic oil in the back cavity will be pressureless, the active unloading valve will be open, the active unloading valve will be in a near-zero pressure conduction state, and the hydraulic system will be unloaded at near-zero pressure. Attached Figure Description

[0012] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0013] Figure 1 This is a system schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the unloading valve assembly according to Embodiment 1 of the present invention; Figure 3 This is a structural diagram of the unloading valve assembly according to Embodiment 1 of the present invention; Figure 4 yes Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the structural principle of a two-position three-way solenoid valve according to Embodiment 1 of the present invention; Figure 6 This is another structural schematic diagram of the two-position three-way solenoid valve according to Embodiment 1 of the present invention; Figure 7 This is a structural diagram of Embodiment 2 of the present invention; In the diagram: 100 - Directional control valve; 200 - Proportional valve; 300 - Pressure reducing valve; 400 - Active unloading valve; 401 - Valve body one; 402 - Valve core one; 403 - Back cavity; 404 - Throttling port; 405 - Spring; 500 - Two-position three-way solenoid valve; 501 - Valve body two; 502 - Oil port A; 503 - Oil port B; 504 - Valve core two; 505 - Oil port C; 507 - Oil passage two; 506 - Oil passage one; 508 - Oil passage three. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0015] Example 1: like Figure 1 As shown, the pressure instantaneous reconstruction system of the mid-position unloading open multi-way valve system includes a multi-way valve installed on the main oil line and an integral two-position three-way logic control unloading valve located at the end of the mid-position unloading oil line of the multi-way valve.

[0016] The multi-way valve includes several directional valves 100, a proportional valve 200 that controls the operation of the directional valves 100, and a pressure reducing valve 300 located between the main oil circuit and the proportional valve 200. The multi-way valve is a commonly used type of multi-way valve with an open-spindle system in the prior art; its structure is described below. Figure 1 The pressure reducing valve 300 can provide pilot oil to the proportional valve 200 to provide energy for switching the directional valve 100.

[0017] See Figure 2 and Figure 3 The integrated two-position three-way logic control unloading valve includes an active unloading valve 400 and a two-position three-way solenoid valve 500. The two-position three-way solenoid valve 500 and the active unloading valve 400 are fixed together to form an integrated structure. The oil inlet P3 of the active unloading valve 400 is connected to the end of the middle unloading circuit of the multi-way valve, and the oil return port T3 of the active unloading valve 400 is connected to the oil return tank. The active unloading valve 400 has a back cavity 403. The working port A2 of the two-position three-way solenoid valve 500 is connected to the back cavity 403. The oil return port T2 of the two-position three-way solenoid valve 500 is connected to the oil return tank, and the oil inlet P2 of the two-position three-way solenoid valve 500 is connected to the pressure oil line of the multi-way valve. When the two-position three-way solenoid valve 500 is not energized... When the two-position three-way solenoid valve 500 is energized, the oil passage between the working port A2 and the return port T2 is connected, and the active unloading valve 400 is opened, and the oil passage between the inlet port P3 and the return port T3 is connected. When the two-position three-way solenoid valve 500 is energized, the oil passage from the working port A2 to the return port T2 is disconnected, and the oil passage between the working port A2 and the inlet port P2 is connected. Pressure is generated in the back cavity 403, and the active unloading valve 400 is closed under the pressure. The oil passage between the inlet port P3 and the return port T3 is disconnected.

[0018] See Figure 3 and Figure 4 The active unloading valve 400 includes a valve body 401, an oil inlet P3 located at the head end of the valve body 401, an oil return port T3 located at the side of the valve body 401, a valve core 402 slidably disposed inside the valve body 401, the valve core 402 sliding along the valve body 401 to connect or disconnect the oil passage between the oil inlet P3 and the oil return port T3, a back cavity 403 located at the tail end of the valve core 402, a spring 405 installed in the back cavity 403 to control the sliding of the valve core 402, and a throttling port 404 connected to the oil inlet P3 and the back cavity 403 on the valve body 401, the throttling port 404 being disposed on the valve core 402 to connect the oil inlet P3 and the back cavity inside the active unloading valve 400. Of course, the spring 405 may not be provided in the back cavity 403, which is also within the scope of protection of this patent.

[0019] See Figure 3 and Figure 4 The two-position three-way solenoid valve 500 includes a valve body 2 501. The valve body 2 501 is inserted and fixed inside the valve body 1 401, and the head of the valve body 2 501 is sealed and inserted into the back cavity 403 inside the valve core 1. The two ends of the spring 405 abut against the valve core 1 402 and the valve body 2 501 respectively.

[0020] The inner circumference of the tail end of valve body 401 is provided with a threaded section 1. Valve body 501 is inserted into the tail end of valve body 401 and is connected to the threaded section 1. For further details of the structure, see [link to documentation]. Figure 4 The tail end of the valve body 1 is provided with a tail seat 1. The outer periphery of the tail end of the valve body 1 is connected to the tail seat 1 by a thread. The threaded section 1 is provided on the inner periphery of the tail end of the tail seat 1. The outer periphery of the tail seat 1 is also provided with a threaded section 2 connected to the valve seat of the multi-way valve. The head of the valve body 2 is sealed and inserted into the tail end of the valve body 1 401. The middle part of the valve body 2 is sealed and inserted into the tail seat 1. The tail end of the valve body 2 is connected to the threaded section 1 through the tail seat 2. The tail seat 2 and the tail end of the valve body 2 are threadedly connected to form an integral threaded insertion structure.

[0021] The two-position three-way solenoid valve has an oil inlet P2, a working port A2, and an oil return port T2. The valve body 501 has an oil port B503 communicating with the oil return port T2 and an oil port C505 communicating with the oil inlet P2. A valve core 504 is slidably disposed inside the valve body 501. The valve core 504 has an oil port A502 communicating with the working port A2. The valve core 504 alternately opens and closes the oil passage between oil port A502 and oil port B503, and between oil port A502 and oil port C505. The working port A2 is located inside the valve body 501 and communicates with the back cavity 403.

[0022] The valve core 2 504 is further provided with an oil passage 1 506 connecting the oil port A 502 and the oil port B 503. The valve body 1 401 is provided with an oil passage 2 507 connecting the oil port B 503 and the return oil port T2. The valve body 1 401 is provided with an oil passage 3 508 connecting the oil port C 505 and the working port P2.

[0023] When the two-position three-way solenoid valve is energized, the oil circuit from the working port A2 to the return port T2 is disconnected. This can be achieved in two structural forms: one is described in [reference needed]. Figure 5 When energized, the solenoid valve is in the right position. At this time, the oil at working port A2 will not flow to the return port T2, and working port A2 is connected to the inlet port P2; see another example. Figure 6 When energized, the solenoid valve is in the right position, the working port A2 is disconnected from the return port T2, and the working port A2 is connected to the inlet port P2.

[0024] The working principle of this embodiment is as follows: When the two-position three-way solenoid valve 500 is not energized, see Figure 2 The two-position three-way solenoid valve 500 is in the left position. At this time, the oil passage between oil port A502 and oil port B503 is connected, while the oil passage between oil port A502 and oil port C505 is disconnected. When oil enters through oil inlet P3, a portion of the hydraulic oil inlet P3 flows through the throttle port 404 to the back cavity 403, and then flows sequentially through oil port A502, oil port B503, and return port T2 into the return oil tank for unloading. Pressure cannot be established within 03. When the pressure at the oil inlet is high, the force of the spring 405 will be overcome to push the valve core 402 upward (when there is no spring 405, it is not necessary to overcome the force of the spring 405). The valve core 402 is opened to connect the oil circuit between the oil inlet P3 and the return oil port T3. The hydraulic oil flows through the oil inlet P3 to the return oil port T3 for unloading. At this time, the active unloading valve 400 is in a near-zero pressure conduction state, and the hydraulic system is near-zero pressure unloading. When the two-position three-way solenoid valve 500 is energized, see Figure 2 When the two-position three-way solenoid valve 500 is in the right position, the oil passage from port A502 to port B503 is disconnected, while the oil passage between port A502 and port C505 is connected. After oil enters through port P3, the active unloading valve is unloading, and a portion of the hydraulic oil in port P3 flows to the back cavity 403 through the throttle port 404 of valve core 402. Because the oil passage between port A502 and port B503 is disconnected, and the oil passage between port A502 and port C505 is connected, the back cavity 403 is filled with hydraulic oil. The pressurized oil cannot be unloaded through the return port T3. At the same time, the pressurized oil at the inlet P2 passes through the port C505 and the port A502 and enters the working port A2. The hydraulic oil accumulates pressure in the back cavity 403. Under the spring force of the spring 405 and the pressure difference (due to the area difference), the back cavity 403 can push the valve core 402 downward, disconnecting the oil circuit between the inlet P3 and the return port T3, and closing the active unloading valve 400. At this time, the system pressure of the entire hydraulic system is established.

[0025] This application presents a specially structured integrated unloading valve assembly connected in series at the end of the intermediate unloading oil circuit of the open-core system. When none of the hydraulic sub-circuits of the open-core system are working, the A2 and T2 ports of the two-position three-way solenoid valve connected to the control chamber of the active unloading valve are in a conductive state. At this time, the valve core 402 of the active unloading valve is in an open state under the action of the oil in the P3 port oil circuit, so that the multi-way valve is in a near-zero pressure unloading state. When any hydraulic sub-circuit is working, the control signal is input to the two-position three-way solenoid valve, so that the oil circuit A2 of the two-position three-way solenoid valve connected to the control end of the active unloading valve is connected to the oil inlet P2. Hydraulic oil from inlet P2 and hydraulic oil passing through the throttle port enter the back cavity of the active unloading valve. As more oil enters the back cavity, the valve core 402 of the active unloading valve gradually closes, closing the active unloading valve and thus shutting off the unloading circuit. This eventually establishes system pressure, creating a state where operation can resume. When no work is required, the electrical signal is canceled, the back cavity of the active unloading valve is released, the hydraulic oil in the back cavity is pressureless, the active unloading valve opens, and the active unloading valve is in a near-zero pressure conduction state. The hydraulic system is unloaded at near-zero pressure, which can reduce ineffective energy consumption.

[0026] Example 2: This embodiment has a basically the same structure as Embodiment 1, the main difference being the position of the throttling orifice 404 in the active unloading valve 400. In Embodiment 1, it is a hydraulic resistance valve internal connection structure, that is, a small-diameter throttling orifice 404 is machined inside the valve core 402 of the active unloading valve 400.

[0027] In Embodiment 2, the external connection structure of the hydraulic resistance valve refers to the structure outside the active unloading valve 400; see the structural diagram below. Figure 7 The throttle port 404 is located on the valve seat outside the valve body 401, connecting the oil inlet P3 and the back cavity outside the active unloading valve 400. The throttle port 404 can be directly cast or machined on the valve seat with a small diameter oil passage. In this case, the working principle is basically the same as in Embodiment 1.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. An integrated two-position three-way logic-controlled unloading valve, characterized in that: This includes an integrated active unloading valve and a two-position three-way solenoid valve; The active unloading valve includes a valve body 1, which has an oil inlet P3 and an oil return port T3. A valve core 1, which connects or disconnects the oil passage between the oil inlet P3 and the oil return port T3, is slidably disposed within the valve body 1. The tail end of the valve core 1 has a back cavity, and the oil inlet P3 is also connected to the back cavity through a throttling port. The two-position three-way solenoid valve includes a valve body 2, which is inserted and fixed within the valve body 1, with its head sealed and inserted into the back cavity within the valve core 1. The two-position three-way solenoid valve has an oil inlet P2, a working port A2, and an oil return port T2. The valve body has an oil port B that communicates with the oil return port T2 and an oil port C that communicates with the oil inlet P2. A valve core 2 is slidably disposed inside the valve body 2. The valve core 2 has an oil port A that communicates with the working port A2. The valve core 2 slidably alternately opens and closes the oil passage between oil port A and oil port B, and the oil passage between oil port A and oil port C. The working port A2 is located inside the valve body 2 and communicates with the back cavity. When the two-position three-way solenoid valve is not energized, the oil passage between port A and port B is connected, that is, the oil passage between working port A2 and return port T2 is connected. The back cavity is connected to the return oil tank through working port A2 and return port T2. The back cavity can be unloaded by the two-position three-way solenoid valve. The valve core can connect the oil passage between inlet port P3 and return port T3 to unload. When the two-position three-way solenoid valve is energized, the oil passage between port A and port C is connected, that is, the inlet port P2 is connected to working port A2. The oil can build back pressure in the back cavity. The valve core can disconnect the oil passage between inlet port P3 and return port T3.

2. The integral two-position three-way logic control unloading valve as described in claim 1, characterized in that: The valve body one has a threaded section on the inner circumference of its tail end, and the valve body two is inserted into the tail end of the valve body one and connected to the threaded section one.

3. The integral two-position three-way logic control unloading valve as described in claim 2, characterized in that: The tail end of the valve body is connected to a tail seat, and the outer periphery of the tail seat is provided with a threaded section.

4. The integral two-position three-way logic control unloading valve as described in claim 1, characterized in that: The oil inlet P3 is located at the head end of the valve body, and the oil return port T3 is located on the side of the valve body. The valve core slides along the valve body to connect or disconnect the oil passage between the oil inlet P3 and the oil return port T3.

5. The integral two-position three-way logic control unloading valve as described in claim 1, characterized in that: A spring is installed inside the back cavity to control the sliding of the valve core, and the two ends of the spring abut against the valve core and the valve body.

6. The integral two-position three-way logic-controlled unloading valve as described in claim 1, characterized in that: The throttling port is located on the valve core and connects the oil inlet P3 with the back cavity inside the active unloading valve.

7. The integral two-position three-way logic control unloading valve as described in claim 1, characterized in that: The throttling port is located on the valve seat outside the valve body, connecting the oil inlet P3 to the back cavity outside the active unloading valve.

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