Variable open center system lift valve

Abstract

The utility model discloses a variable open center system lift valve which comprises a lift valve body and a lift valve core, and further comprises a compensation valve body and a compensation valve core, and a reset device is installed between the rear end of the compensation valve core and the compensation valve body. A compensation oil inlet way communicated with the first lifting oil inlet way and a compensation oil return way communicated with the lifting oil return way are sequentially formed in the compensation valve body, a compensation oil groove is formed in the compensation valve element, and the first lifting working oil way and the second lifting working oil way are communicated with the rear portion of the compensation valve element. And a compensation valve element driving oil way for communicating the compensation oil groove with the front of the compensation valve element is formed in the compensation valve element. And the effects of reducing energy consumption, reducing system impact and adjusting system pressure can be achieved to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a variable open-center system lift valve. Background Art

[0002] The existing lifting valve is a metering pump open center system. During the rising and falling process of the lifting valve of the metering pump open center system, there will be excess flow resulting in a large back pressure when the system pressure is met. When the rising and falling are slow, the pressure overflow phenomenon that reaches the opening of the overflow valve occurs, which causes unnecessary waste to a great extent and seriously affects the service life of various components of the system. Utility Model Content

[0003] The purpose of the utility model is to provide a variable opening center system lift valve to solve the above problems, thereby reducing energy consumption and lowering system impact.

[0004] To achieve the above-mentioned purpose, the utility model discloses a variable open center system lift valve, which includes a lift valve body and a lift valve core, and the lift valve body is sequentially provided with a first lift oil inlet oil circuit, a lift oil return oil circuit, a second lift oil inlet oil circuit, a first lift working oil circuit, a second lift working oil circuit and a third lift oil inlet oil circuit, and the lift valve core is sequentially provided with a first lift oil groove, a second lift oil groove, a third lift oil groove, a fourth lift oil groove and a fifth lift oil groove, and also includes a compensation valve body and a compensation valve core, and a reset device is installed between the rear end of the compensation valve core and the compensation valve body, and the compensation valve body is sequentially provided with a compensation oil inlet oil circuit connected with the first lift oil inlet oil circuit and a compensation return oil circuit connected with the lift oil return oil circuit, and the compensation valve core is provided with a compensation oil groove, the first lift working oil circuit and the second lift working oil circuit are connected to the rear of the compensation valve core, and the compensation valve core is provided with a compensation valve core driving oil circuit connecting the compensation oil groove and the front of the compensation valve core.

[0005] The advantages of this structure are that it plays a compensatory role and a diversion role, so that the system pressure will not be too large while meeting the requirements. It disguises the fixed-displacement pump open-center system into a variable-displacement open-center system, which can reduce energy consumption, lower system impact and regulate system pressure to a certain extent.

[0006] Preferably, when the second lifting oil inlet circuit is connected to the first lifting working oil circuit through the third lifting oil tank, the third lifting oil inlet circuit is connected to the second lifting working oil circuit through the fifth lifting oil tank, and the first lifting oil inlet circuit is connected to the lifting return oil circuit through the first lifting oil tank; or, when the second lifting oil inlet circuit is connected to the first lifting working oil circuit through the third lifting oil tank, the compensation oil inlet circuit is connected to the compensation return oil circuit through the compensation oil tank; or, when the third lifting oil inlet circuit is connected to the second lifting working oil circuit through the fifth lifting oil tank, the compensation oil inlet circuit is connected to the compensation return oil circuit through the compensation oil tank.

[0007] This structure automatically adjusts the system pressure (P) based on the load (P) while meeting the required flow and pressure. Based on the principle of P = P + P, it helps address the issue of high pressure drop. It matches the pressure response to the load, reducing overall system pressure while meeting normal needs. This saves energy and improves system stability. The neutral position also maintains a moderate pressure, reducing system energy consumption.

[0008] Preferably, the reset means comprises a spring.

[0009] This structure is simple and easy to process and manufacture.

[0010] Preferably, the diameter of the rear section of the compensation valve core is smaller than the diameter of the front section thereof, and the spring is sleeved on the rear section of the compensation valve core.

[0011] This structure facilitates the installation of the spring.

[0012] Preferably, a connecting oil circuit connected to the rear of the compensation valve core is opened on the compensation valve body, and the connecting oil circuit is connected to the second lifting working oil circuit.

[0013] This structure is connected to the second lifting working oil circuit through the connecting oil circuit, which can reduce the length of the active cavity of the compensation valve core and facilitate the design and processing of the compensation valve core.

[0014] Preferably, one end of the compensation valve core driving oil circuit is located at the front end of the compensation valve core, and the other end is connected to the bottom of the compensation oil tank.

[0015] This structure facilitates the processing and manufacturing of the compensation valve core drive oil circuit.

[0016] Preferably, the number of channels between the compensation valve core driving oil circuit and the bottom of the compensation oil tank is at least two.

[0017] When the compensation valve core moves, the oil supply efficiency of the compensation valve core driving oil circuit is guaranteed, and it is easy to use.

[0018] Preferably, the lifting valve body and the compensating valve body are designed to be separate bodies, and a number of sealing rings are installed between the lifting valve body and the compensating valve body.

[0019] This structure facilitates the processing and manufacturing of the lifting valve body and the compensating valve body.

[0020] To sum up, the beneficial effect of the present invention is that the advantages of this structure not only play a compensatory role, but also have a diversion effect, so that the pressure of the system will not be too large while meeting the requirements, and the quantitative pump open center system is transformed into a variable open center system in disguise, which can reduce energy consumption, reduce system impact and regulate the system pressure to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the neutral state structure of a variable open center system poppet valve of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of a variable open center system lift valve in the rising state of the utility model;

[0023] Figure 3 The utility model is a schematic structural diagram of a variable opening center system lift valve in a descending state.

[0024] In the figure: 1. Lifting valve body; 2. Lifting valve core; 3. First lifting oil inlet circuit; 4. Lifting oil return circuit; 5. First lifting working oil circuit; 6. Second lifting working oil circuit; 7. Second lifting oil inlet circuit; 8. Third lifting oil inlet circuit; 9. First lifting oil tank; 10. Second lifting oil tank; 11. Third lifting oil tank; 12. Fourth lifting oil tank; 13. Fifth lifting oil tank; 14. Compensating valve body; 15. Compensating valve core; 16. Compensating oil inlet circuit; 17. Compensating oil return circuit; 18. Connecting oil circuit; 19. Spring; 20. Compensating oil tank; 21. Compensating valve core drive circuit; 22. Sealing ring. DETAILED DESCRIPTION

[0025] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0030] like Figures 1 to 3 As shown, a variable opening center system poppet valve includes a poppet valve body 1 and a poppet valve core 2. The poppet valve body 1 is sequentially provided with a first poppet oil inlet passage 3, a poppet oil return passage 4, a second poppet oil inlet passage 7, a first poppet working passage 5, a second poppet working passage 6 and a third poppet oil inlet passage 8. The poppet valve core 2 is sequentially provided with a first poppet oil groove 9, a second poppet oil groove 10, a third poppet oil groove 11, a fourth poppet oil groove 12 and a fifth poppet oil groove 13. The poppet valve core 2 also includes a compensation valve body 14 and a compensation valve core 15. A reset device is installed between the rear end of the compensation valve core 15 and the compensation valve body 14. The compensation valve body 14 is provided with a compensation oil inlet oil circuit 16 connected to the first lifting oil inlet oil circuit 3 and a compensation oil return oil circuit 17 connected to the lifting oil return oil circuit 4 in sequence. The compensation valve core 15 is provided with a compensation oil groove 20. The first lifting working oil circuit 5 and the second lifting working oil circuit 6 are connected to the rear of the compensation valve core 15. The compensation valve core 15 is provided with a compensation valve core drive oil circuit 21 connecting the compensation oil groove 20 and the front of the compensation valve core 15.

[0031] In state one, when the second lift oil inlet line 7 is connected to the first lift working oil line 5 via the third lift oil tank 11, the third lift oil inlet line 8 is connected to the second lift working oil line 6 via the fifth lift oil tank 13, and the first lift oil inlet line 3 is connected to the lift return oil line 4 via the first lift oil tank 9. In this state, the first lift working oil line 5 and the second lift working oil line 6 are both open, and the hydraulic oil in the first lift oil inlet line 3 enters the lift return oil line 4. The hydraulic oil in the first lift working oil line 5 and the second lift working oil line 6 causes the compensation valve spool 15 to move forward. At this point, the lifter is in the neutral position.

[0032] In state two, when the second lift oil inlet line 7 is connected to the first lift working oil line 5 via the third lift oil tank 11, the compensation oil inlet line 16 is connected to the compensation oil return line 17 via the compensation oil tank 20. In this state, the first lift working oil line 5 is open, the second lift working oil line 6 is closed, and the hydraulic oil in the first lift oil inlet line 3 enters the front of the compensation valve spool 15 through the compensation valve spool drive oil line 21, causing the compensation valve spool 15 to move backward. At this time, the lifter is in the raised position.

[0033] In state three, the third lift oil inlet line 8 is connected to the second lift working oil line 6 via the fifth lift oil tank 13, and the compensation oil inlet line 16 is connected to the compensation oil return line 17 via the compensation oil tank 20. In this state, the second lift working oil line 6 is open, the first lift working oil line 5 is closed, and the hydraulic oil in the first lift oil inlet line 3 enters the front of the compensation valve spool 15 through the compensation valve spool drive oil line 21, causing the compensation valve spool 15 to move backward. At this time, the lifter is in the lowered position.

[0034] This structure automatically adjusts system pressure (P1) based on the load (Pnegative), while meeting the required system flow and pressure. The principle is P1 = Pnegative + Pcompression. The pressure of Pcompression is generally set between 0.4 MPa and 0.6 MPa, which helps address the issue of high drop pressure. By matching the response pressure to the load, while meeting normal needs, the overall system pressure is reduced, saving energy and improving system stability. The neutral position also maintains a moderate pressure, reducing system energy consumption.

[0035] The advantages of this structure are that it plays a compensatory role and a diversion role, so that the system pressure will not be too large while meeting the requirements. It disguises the fixed-displacement pump open-center system into a variable-displacement open-center system, which can reduce energy consumption, lower system impact and regulate system pressure to a certain extent.

[0036] Specifically, the reset device includes a spring 19. This structure is simple and easy to manufacture. The diameter of the rear section of the compensation valve core 15 is smaller than the diameter of its front section, and the spring 19 is sleeved on the rear section of the compensation valve core 15. This structure facilitates the installation of the spring 19.

[0037] Specifically, a connecting oil circuit 18 connected to the rear of the compensation valve core 15 is provided on the compensation valve body 14, and the connecting oil circuit 18 is connected to the second lifting working oil circuit 6. This structure is connected to the second lifting working oil circuit 6 by the connecting oil circuit 18, which can reduce the length of the movable cavity of the compensation valve core 15, and facilitate the design and processing and manufacturing of the compensation valve core 15. One end of the compensation valve core drive oil circuit 21 is located at the front end of the compensation valve core 15, and the other end is connected to the bottom of the compensation oil groove 20. This structure facilitates the processing and manufacturing of the compensation valve core drive oil circuit 21. The number of channels between the compensation valve core drive oil circuit 21 and the bottom of the compensation oil groove 20 is at least two. When the compensation valve core 15 moves, the oil supply efficiency of the compensation valve core drive oil circuit 21 is guaranteed, and it is easy to use.

[0038] Specifically, the poppet valve body 1 and the compensating valve body 14 are designed as separate bodies, with several sealing rings 22 installed between the poppet valve body 1 and the compensating valve body 14. The assembly of the poppet valve body 1 and the compensating valve body 14 utilizes existing techniques and will not be further described here. This structure facilitates the processing and manufacturing of the poppet valve body 1 and the compensating valve body 14.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A variable open center system lift valve, comprising a lift valve body (1) and a lift valve core (2), characterized in that: The lifting valve body (1) is provided with a first lifting oil inlet oil circuit (3), a lifting oil return oil circuit (4), a second lifting oil inlet oil circuit (7), a first lifting working oil circuit (5), a second lifting working oil circuit (6) and a third lifting oil inlet oil circuit (8) in sequence, and the lifting valve core (2) is provided with a first lifting oil groove (9), a second lifting oil groove (10), a third lifting oil groove (11), a fourth lifting oil groove (12) and a fifth lifting oil groove (13) in sequence, and also includes a compensation valve body (14) and a compensation valve core (15), the rear end of the compensation valve core (15) is connected to the compensation valve body A reset device is installed between the compensation valve body (14), and a compensation oil inlet oil circuit (16) connected to the first lifting oil inlet oil circuit (3) and a compensation oil return oil circuit (17) connected to the lifting oil return oil circuit (4) are sequentially provided on the compensation valve body (14). A compensation oil groove (20) is provided on the compensation valve core (15), and the first lifting working oil circuit (5) and the second lifting working oil circuit (6) are connected to the rear of the compensation valve core (15). A compensation valve core driving oil circuit (21) is provided on the compensation valve core (15) to connect the compensation oil groove (20) and the front of the compensation valve core (15).

2. The variable open center system poppet valve according to claim 1, characterized in that: When the second lifting oil inlet circuit (7) is connected to the first lifting working oil circuit (5) through the third lifting oil groove (11), the third lifting oil inlet circuit (8) is connected to the second lifting working oil circuit (6) through the fifth lifting oil groove (13), and the first lifting oil inlet circuit (3) is connected to the lifting return oil circuit (4) through the first lifting oil groove (9); or, when the second lifting oil inlet circuit (7) is connected to the first lifting working oil circuit (5) through the third lifting oil groove (11), the compensation oil inlet circuit (16) is connected to the compensation return oil circuit (17) through the compensation oil groove (20); or, when the third lifting oil inlet circuit (8) is connected to the second lifting working oil circuit (6) through the fifth lifting oil groove (13), the compensation oil inlet circuit (16) is connected to the compensation return oil circuit (17) through the compensation oil groove (20).

3. The variable open center system poppet valve according to claim 2, characterized in that: The reset device comprises a spring (19).

4. The variable open center system poppet valve according to claim 3, characterized in that: The diameter of the rear section of the compensation valve core (15) is smaller than the diameter of the front section thereof, and the spring (19) is sleeved on the rear section of the compensation valve core (15).

5. The variable open center system poppet valve according to claim 2, characterized in that: A connecting oil circuit (18) communicating with the rear of the compensating valve core (15) is provided on the compensating valve body (14), and the connecting oil circuit (18) is connected with the second lifting working oil circuit (6).

6. The variable open center system poppet valve according to claim 2, characterized in that: One end of the compensation valve core driving oil circuit (21) is located at the front end of the compensation valve core (15), and the other end is connected to the bottom of the compensation oil groove (20).

7. The variable open center system poppet valve according to claim 6, characterized in that: The number of channels between the compensation valve core driving oil circuit (21) and the bottom of the compensation oil groove (20) is at least two.

8. The variable open center system poppet valve according to any one of claims 1 to 7, characterized in that: The lifting valve body (1) and the compensating valve body (14) are designed as separate bodies, and a plurality of sealing rings (22) are installed between the lifting valve body (1) and the compensating valve body (14).

Images