Pressure compensation front-mounted multi-way valve

Abstract

The invention discloses a pressure compensation front-mounted multi-way valve which comprises a working unit, an oil duct A and an oil duct B are arranged on the left side and the right side of the top of the working unit respectively, an annular oil duct and a U-shaped oil duct are arranged in the middle of the working unit, and a pressure compensation valve, a P port, inlets of the oil duct A and the oil duct B and an outlet of an oil inlet duct are arranged at the bottom of the working unit. The P port is connected with the oil inlet channel through the pressure compensation valve, the valve element is located in the annular oil channel, and during work, the valve element moves left and right to control the oil inlet channel to be communicated with the oil channel B or control the oil inlet channel, the U-shaped oil channel and the oil channel A to be communicated. In the invention, the oil duct is simplified, the flow of the inner diameter of the oil duct is increased, the flow resistance is reduced, and the hydraulic lock can be compatible.

Description

Technical Field

[0001] The invention relates to a fluid distribution device, in particular to a pressure-compensating front-mounted multi-way valve plate. Background Art

[0002] In the hydraulic system of agricultural machinery tractors, in order to improve the efficiency of the hydraulic system, save energy consumption and improve operating performance, multi-way valves are often used. In order to adapt to the main engine, the multi-way valve is required to have a large flow and a small size.

[0003] The utility model patent with publication number CN 210218274 U discloses an electro-hydraulic proportional multi-way valve for lifting the harvester header. The two ends of the U-shaped oil channel are connected to the oil channels A and B, and the P port is connected to the bottom of the U-shaped oil channel through a pressure compensation valve. When the valve core moves left and right, one end of the U-shaped oil channel is controlled to be connected to the oil channels A and B, and the oil inlet direction of the actuator is selected. This arrangement is helpful for installing a hydraulically controlled hydraulic lock, but the setting of the U-shaped oil channel increases the path through which the oil passes, increases the pressure loss, and increases the volume of the multi-way valve. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a pressure-compensating front-mounted multi-way valve disc that increases the flow rate of the multi-way valve and reduces the volume of the valve body.

[0005] Technical solution: The pressure-compensated front-mounted multi-way valve described in the present invention includes an oil channel A and an oil channel B respectively provided on the left and right sides of the top of the working joint, an annular oil channel and a U-shaped oil channel in the middle, a pressure-compensating valve and a P port provided on one side of the bottom, the inlets of the oil channel A and the oil channel B are connected to the annular oil channels, the two ends of the U-shaped oil channel are connected to the annular oil channels outside the oil channel A and the oil channel B, the outlet of the oil inlet channel is connected to the annular oil channel outside the U-shaped oil channel, the P port is connected to the oil inlet channel through the pressure-compensating valve, the valve core is located in the annular oil channel, and when working, the valve core moves left and right to control the connection between the oil inlet channel and the oil channel B, or the connection between the oil inlet channel, the U-shaped oil channel and the oil channel A.

[0006] Preferably, the bottom of the U-shaped oil passage is communicated with the spring chamber of the pressure compensation valve.

[0007] Preferably, the pressure compensating valve includes a compensating valve core, which has three steps, a neck is formed between two adjacent steps, a damping hole is opened in the neck near the spring end, and an oil channel is opened at the bottom end of the compensating valve core. Oil can enter the bottom end of the compensating valve core from the damping hole and the oil channel to push the compensating valve core to move.

[0008] Preferably, a throttling groove is formed on the middle step, and the throttling groove faces the spring end of the valve core of the compensation valve.

[0009] Preferably, a T port is provided between oil passage A and oil passage B, the T port is connected to the annular oil passage, and the valve core moves left and right to control the connection between oil passage A or oil passage B and T port.

[0010] Preferably, a hydraulic lock is provided on the oil channel B, and the hydraulic lock is arranged longitudinally along the working joint. A push pin is provided on the lock core of the hydraulic lock, and a slope is provided in the middle of the valve core. The bottom of the push pin contacts the valve core, and when the valve core moves, the slope can push the lock core to move.

[0011] Preferably, the hydraulic lock is located between oil passage A and oil passage B.

[0012] Preferably, in order to reduce the volume of the hydraulic lock, the hydraulic lock includes a plug and a butterfly spring. The butterfly spring is located between the plug and the lock core. The lock core extends into the oil channel B. There is a steel ball in the lock core. The steel ball presses the free end of the butterfly spring. One end of the push pin contacts the steel ball, and the other end contacts the valve core.

[0013] Preferably, the valve core and the compensator valve core are parallel.

[0014] Preferably, one end of the valve core is located in the working joint, and the other end extends out of the working joint, and a joint is provided on the extended end.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages: 1. Improving the flow rate of the multi-way valve and reducing the volume of the valve body: the centrally symmetrical U-shaped oil channel is moved outward to the outside of the oil channels A and B, the oil inlet P port is offset, and the inner diameter of the U-shaped oil channel is increased. When connected to the oil channel A, the oil pressure loss is reduced through the large-diameter U-shaped oil channel. When connected to the oil channel B, the oil path is shortened, the flow resistance is reduced, the system pressure loss is greatly reduced, and the valve body flow rate is increased. The flow rate of the multi-way valve of the present invention is not less than 120L / min, the oil channel is greatly simplified, and the weight of the valve plate is reduced by 20% / the thickness is 42mm compared with the conventional one; 2. The interface is simplified and can be compatible with single-acting cylinders and double-acting cylinders; 3. The built-in hydraulic lock simplifies the hydraulic lock structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view of the valve plate structure of the pressure compensation front-mounted multi-way valve of the present invention;

[0017] Figure 2 for Figure 1 Middle AA section view;

[0018] Figure 3 Schematic diagram of the valve plate of the pressure-compensating front-mounted multi-way valve of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0020] like Figure 1As shown, the present invention comprises a working link 13, and the working link 13 is used for distributing fluid to drive the actuator to work.

[0021] like Figure 2 , the left and right sides of the top of the working link 13 are respectively provided with oil passages A and B, and the oil passages A and B are used to connect the actuator. An oil inlet P port and a pressure compensation valve are provided on one side of the bottom of the working link 13, and an annular oil passage 14 and a U-shaped oil passage 13 are provided in the middle. The inlets of the oil passages A and B are connected to the annular oil passage 14, and the two ends of the U-shaped oil passage 13 are connected to the annular oil passage 14 outside the oil passages A and B. The P port is connected to the inlet of the oil inlet passage 12 through the pressure compensation valve, and the U-shaped oil passage 13 is located between the valve core 5 and the pressure Between the force compensator valve core, the outlet of the oil inlet channel 12 is connected to the annular oil channel 14 outside the U-shaped oil channel 13, and the valve core 5 is arranged horizontally along the working link 13, penetrating the annular oil channel 14, and controlling the oil inlet channel 12 to supply oil to one of the oil channels A and the oil channel B. Specifically, when the oil channel A supplies oil to the actuator, the oil inlet channel 12 supplies oil to the oil channel A through the annular oil channel 14 and the U-shaped oil channel 13; when the oil channel B supplies oil to the actuator, the oil inlet channel 12 directly supplies oil to the oil channel B through the annular oil channel 14.

[0022] A plug 2 and a sealing ring 3 are arranged on the working joint 13 at one end of the valve core 5, and the other end extends out of the working joint 13 and is provided with a joint, which is connected to the control valve to control the left and right movement of the valve core 5. The displacement of the valve core 5 controls the output of the flow.

[0023] In order to simplify the oil passage and reduce the number of interfaces, the U-shaped oil passage 13 is set outside the oil passages A and B, but at the same time, the LS oil passage is blocked, so the U-shaped oil passage 13, the bottom of the U-shaped oil passage 13 is connected to the spring chamber of the pressure compensation valve spool 11, thereby, the LS port 4 is formed between the annular oil passage 14 and the U-shaped oil passage 13, no matter whether the oil inlet passage 12 supplies oil to the oil passage A or the oil passage B, the oil in the oil inlet passage 12 can enter the spring chamber of the compensation valve spool 11 through the annular oil passage 14, so that the oil pressure of the oil inlet passage 12 is stable. There is no need to open the LS oil passage on the valve core 5.

[0024] There is an oil return T port between oil channel A and oil channel B. When the oil inlet oil channel 12 is connected to one of oil channel A and oil channel B, the other unconnected one is connected to the T port to perform oil return. The two ends of the U-shaped oil channel 13 are connected to the annular oil channel 14 outside the oil channels A and B, which can reduce the number of oil return T ports to one, thereby increasing the inner diameter of the oil channel and reducing pressure loss.

[0025] The pressure compensating valve includes a compensating valve core 11, which has three steps, a neck between two steps, a throttling groove on the middle step, the opening direction of the throttling groove toward the spring end 1 of the compensating valve core 11, a damping hole on the neck near the spring end 1, an internal oil channel on the bottom end of the compensating valve core 11 (away from the spring end 1), and oil can enter the bottom end of the compensating valve core from the damping hole and the oil channel, and a plug is provided on the working joint at the bottom end of the compensating valve core 11. The compensator valve core 11 is parallel to the valve core 5.

[0026] The U-shaped oil passage 13 is arranged outside the oil passages A and B, and the hydraulic control type hydraulic lock is limited in driving. Therefore, a hydraulic lock is arranged on the oil passage B. The hydraulic lock is arranged longitudinally along the working joint 13 and is perpendicular to the valve core 5. The hydraulic lock includes a lock core 10, a plug 8, and a butterfly spring 7. The butterfly spring 7 is located between the plug 8 and the lock core 10 to reset the lock core 10, and the lock core 10 controls the opening and closing of the oil passage B. There is a steel ball 9 in the lock core 10, and the steel ball 9 presses the free end of the butterfly spring 7. A push pin 6 is connected to the bottom of the lock core 10. One end of the push pin 6 contacts the steel ball 9, and the other end contacts the valve core 5. There is a slope in the middle of the valve core 5. When the valve core 5 moves, the steel ball can be lifted up by the slope and the push pin, so that the pressure in the lower cavity of the steel ball is equal to the pressure in the upper cavity of the steel ball, and then the lock core 10 is pushed open by the push pin 6, so that the lock core is fully opened, the oil passage B is connected, and the flow passes through. The oil passage B is also provided with an additional oil passage 15, which is used to install other valves, such as an anti-cavitation valve and an overflow protection valve.

[0027] like Figure 3 As shown, when the valve core 5 moves to the right position 1 in the figure, the oil enters from the P port, enters the bottom end of the compensation valve core 11 through the damping hole of the compensation valve core 11 and the internal oil channel, pushes open the compensation valve core 11, and enters the annular oil channel 14. A part of the oil in the annular oil channel 14 enters the oil channel B, pushes open the lock core 10, and enters the actuator, and the other part is fed back to the spring chamber of the compensation valve core 11 through the U-shaped oil channel 13. At the same time, the end of the U-shaped oil channel 13 close to the oil channel A is blocked by the valve core 5, and the oil channel A is connected to the T port, and the actuator returns oil through the oil channel A.

[0028] When the valve core 5 moves to the left 2 position in the figure, the oil enters the actuator through the annular oil passage 14, the U-shaped oil passage 13, and the oil passage A, the valve core 5 pushes the lock core 10 through the push pin 6, the oil passage B is connected to the T port, and the actuator returns oil through the oil passage B. When the valve core 5 moves to the F position in the figure, it is a floating position.

Claims

1. A pressure-compensated front-mounted multi-way valve, comprising a working connection, characterized in that: The left and right sides of the top of the working joint (13) are respectively provided with oil passages A and oil passages B, the middle part is provided with an annular oil passage (14) and a U-shaped oil passage (13), and one side of the bottom is provided with a pressure compensation valve and a P port. The inlets of the oil passages A and oil passages B are connected to the annular oil passages (14), the two ends of the U-shaped oil passage (13) are connected to the annular oil passages (14) outside the oil passages A and B, the outlet of the oil inlet passage (12) is connected to the annular oil passage (14) outside the U-shaped oil passage (13), the P port is connected to the oil inlet passage (12) through the pressure compensation valve, the valve core (5) is located in the annular oil passage (14), and when working, the valve core (5) moves left and right to control the oil inlet passage (12) and the oil passage B to be connected, or the oil inlet passage (12), the U-shaped oil passage and the oil passage A to be connected.

2. The pressure-compensated front-mounted multi-way valve according to claim 1, characterized in that: The bottom of the U-shaped oil passage (13) is communicated with the spring chamber of the pressure compensation valve.

3. The pressure-compensated front-mounted multi-way valve according to claim 1, characterized in that: The pressure compensating valve comprises a compensating valve core (11), the compensating valve core (11) having three steps, a neck formed between two adjacent steps, a damping hole formed in the neck close to the spring end (1) of the compensating valve core (11), an oil passage formed at the bottom end of the compensating valve core (11), and oil can enter the bottom end of the compensating valve core (11) through the damping hole and the oil passage to push the compensating valve core to move.

4. The pressure-compensated front-mounted multi-way valve according to claim 3, characterized in that: A throttling groove is formed on the middle step, and the throttling groove faces the spring end (1) of the valve core (11) of the compensation valve.

5. The pressure-compensated front-mounted multi-way valve according to claim 1, characterized in that: A T port is provided between the oil passage A and the oil passage B, and the T port is connected to the annular oil passage (14). The valve core (5) moves left and right to control the oil passage A or the oil passage B to communicate with the T port.

6. The pressure-compensated front-mounted multi-way valve according to claim 1, characterized in that: A hydraulic lock is provided on the oil passage B. The hydraulic lock is arranged longitudinally along the working link (13). A lock core (10) of the hydraulic lock is connected to a push pin (6). A slope is provided in the middle of the valve core (5). The bottom of the push pin (6) contacts the valve core (5). When the valve core (5) moves, the lock core (10) can be pushed to move by the slope and the push pin.

7. The pressure-compensated front-mounted multi-way valve according to claim 6, characterized in that: The hydraulic lock comprises a plug (8) and a butterfly spring (7). The butterfly spring (7) is located between the plug (8) and a lock core (10). The lock core (10) extends into an oil passage B. A steel ball (9) is arranged in the lock core (10). The steel ball (9) presses the free end of the butterfly spring (7). One end of a push pin (6) contacts the steel ball, and the other end contacts the valve core (5).

8. The pressure-compensated front-mounted multi-way valve according to claim 6, characterized in that: The hydraulic lock is located between oil passage A and oil passage B.

9. The pressure-compensated front-mounted multi-way valve according to claim 3, characterized in that: The valve core (5) and the compensator valve core (11) are parallel.

10. The pressure-compensated front-mounted multi-way valve according to claim 1, characterized in that: One end of the valve core (5) is located in the working joint (13), and the other end extends out of the working joint (13), and a joint is provided on the extended end.

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