Hydraulic pump with overpressure self-sealing function

Abstract

The utility model discloses a hydraulic pump with an overpressure self-sealing function, which comprises a motor, a hydraulic pump body is arranged on one side of the motor, a sliding sealing structure is arranged in the hydraulic pump body, and a passage is automatically closed through the sliding sealing structure when the pressure exceeds a limit value. According to the hydraulic pump with the overpressure self-sealing function, along with starting of the motor, kinetic energy generated by rotation of the motor is transmitted to the hydraulic pump body through the coupler, along with work of the hydraulic pump body, hydraulic oil can be pumped into the hydraulic pump body through the liquid inlet and then is discharged from the first discharging opening and the same discharging opening, and therefore the hydraulic pump can be used for pumping the hydraulic oil into the hydraulic pump body. And after the execution element works, the pressure in the pipeline can be gradually increased along with rotation of the motor, and at the moment, the hydraulic oil can push the isolation rubber layer, so that the isolation rubber layer drives the core valve and the valve column head to move, communication between the co-discharge port and the liquid discharge port is disconnected, and an oil way of the hydraulic pump body is self-closed.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic pump technical field, concretely is a kind of hydraulic pump with overpressure self-closing. BACKGROUND

[0002] Hydraulic pump is the power element in hydraulic transmission system, it is driven by engine or motor, and the hydraulic oil is extracted from oil tank by hydraulic pump, forms pressure oil and is discharged outward, and is sent to the execution element in a kind of element, and hydraulic pump can be divided into gear pump, plunger pump, vane pump and screw pump according to structure, and can be divided into fixed displacement pump and variable displacement pump according to whether flow can be adjusted, and the application range of hydraulic pump is very extensive, is applied to agricultural machinery, automobile industry, public setting, metallurgical industry etc., but in existing hydraulic transmission system, the pressure of oil cannot be controlled, the pressure in oil pipeline is prone to exceed limit, to cause oil pipe to burst. SUMMARY

[0003] The utility model discloses a kind of hydraulic pump with overpressure self-closing, to solve the problem that the hydraulic pump cannot control the hydraulic pressure in pipe in the above background technology leads to pipe burst.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of hydraulic pump with overpressure self-closing, including motor, the input end of the hydraulic pump body and the output end of motor are fixedly connected with shaft coupling, and the one end side surface of hydraulic pump body is penetrated and is provided with liquid inlet, the hydraulic pump body and motor are concentric design, and the one end fixedly provided with injection liquid chamber in the hydraulic pump body away from liquid inlet, the inside of injection liquid chamber is slidably installed with core valve, and sealing ring is arranged between core valve and hydraulic pump body, and the one end side surface of core valve is in contact with the inner surface of hydraulic pump body, the inside of hydraulic pump body is provided with sliding closure structure, and the passage is automatically closed when pressure exceeds limit value by sliding closure structure.

[0005] Preferably, the sliding closure structure includes: first discharge port, the first discharge port penetrates the side surface of injection liquid chamber, the side of the hydraulic pump body close to liquid inlet is fixedly installed with first end cover, and the first end cover and the hydraulic pump body are provided with isolation rubber layer, and the one end of the core valve in the injection liquid chamber is fixedly installed with the isolation rubber layer, the one circle of the isolation rubber layer located outside is provided with annular protrusion, the inside of the hydraulic pump body is provided with cavity, and the one end of the hydraulic pump body away from first discharge port is provided with same discharge port, and the same discharge port is connected with the cavity of hydraulic pump body, and the side surface of hydraulic pump body is penetrated and is provided with liquid discharge port.

[0006] The above technical scheme can drive the hydraulic pump body to work through the rotation of the motor, so that the oil enters the hydraulic pump body from the liquid inlet, is discharged into the liquid injection cavity from the first discharge port, is discharged from the same discharge port, and is discharged from the liquid discharge port. When the discharged oil pressure rises, the oil will push the isolation rubber layer through the first discharge port, drive the core valve through the movement of the isolation rubber layer, disconnect the same discharge port from the liquid discharge port, and automatically disconnect the output after the pressure in the pipeline is increased.

[0007] Preferably, one end of the first end cover is provided with an adjusting mechanism for controlling the required air pressure when the pipeline is closed.

[0008] The above technical scheme can control whether the oil circuit is disconnected and self-closed by the pressure difference between the two sides of the liquid injection cavity by injecting gas into the liquid injection cavity.

[0009] Preferably, the adjusting mechanism comprises a gas injection valve fixedly installed at one end of a gas injection pipe, the gas injection pipe is installed through the side surface of the first end cover, and the gas injection pipe is connected to the liquid injection cavity away from the isolation rubber layer. One end of the gas injection valve is fixedly installed with a gas pressure gauge, and one end of the gas injection valve is connected to the gas pressure pump.

[0010] The above technical scheme can observe the amount of gas injected into the liquid injection cavity by observing the gas pressure gauge, and then maintain the pressure by closing the gas injection valve, so that the adjustment is more convenient.

[0011] Preferably, the side surface of the first end cover is screw-mounted with an adjusting bolt, one end of the adjusting bolt located inside the hydraulic pump body is provided with a top cap, the top cap is rotationally connected with the adjusting bolt, and a spring is arranged between the top cap and the isolation rubber layer.

[0012] The above technical scheme can finely adjust the isolation rubber layer through the adjusting bolt and the spring, and prevent the isolation rubber layer from tearing due to excessive movement through the spring.

[0013] Preferably, one end of the core valve away from the first end cover is screw-mounted with a valve stud head, the diameter of the valve stud head is the same as the diameter of the core valve, one end of the valve stud head close to the isolation rubber layer is designed as a circular truncated cone, the side surface of the valve stud head is in close contact with the side surface of the hydraulic pump body, and the hydraulic pump body and the valve stud head are in sliding connection.

[0014] The above technical scheme can detach the first end cover and the second end cover from the hydraulic pump body, facilitate replacement of the worn isolation rubber layer, core valve and valve stud head after long-term use, and ensure the sealing of the hydraulic pump body pipeline.

[0015] Preferably, the hydraulic pump body is fixedly installed with a second end cover on the side away from the air pressure gauge, a screw-in base is threadedly installed on the side surface of the second end cover, a button is fixedly installed on the side of the screw-in base close to the core valve, the side surface of the button is attached to the side surface of the valve post head, the button is in long-closed state when it is in contact with the valve post head, and the button is connected with the motor.

[0016] With the above technical scheme, when the hydraulic oil discharged by the hydraulic pump body exceeds the limit value set by the pipeline, the isolation rubber layer will be deformed to drive the core valve to move, the movement of the core valve drives the valve post head to move, the valve post head is separated from the button, the motor is stopped, and the hydraulic pump body is prevented from continuing to pump oil after the same discharge port and the discharge port are disconnected, so as to prevent the hydraulic pump body from being damaged.

[0017] Compared with the prior art, the hydraulic pump with self-closing function has the advantages that:

[0018] 1. When the motor is started, the kinetic energy generated by the rotation of the motor is transmitted to the hydraulic pump body through the shaft coupling, and the hydraulic pump body works to pump the hydraulic oil into the inside of the hydraulic pump body through the liquid inlet, and then discharge the hydraulic oil from the first discharge port and the same discharge port, so that the hydraulic oil is discharged into the actuator through the discharge port. When the actuator works, the pressure in the pipeline gradually increases with the rotation of the motor. At this time, the hydraulic oil pushes the isolation rubber layer, and the isolation rubber layer drives the core valve and the valve post head to move, disconnecting the communication between the same discharge port and the discharge port, and sealing the oil circuit of the hydraulic pump body.

[0019] 2. By starting the connection of the air pump and the air injection pipe, the gas is injected into the inside of the liquid injection cavity, the reading of the air pressure gauge is observed, the pressure of the gas injected into the liquid injection cavity is observed, and when the required pressure is reached, the air injection valve can be closed for pressure maintenance. At the same time, the top cap and the spring can be adjusted by adjusting the adjusting bolt to finely adjust the isolation rubber layer, so as to adjust the upper limit of the pressure when sealing the pipeline.

[0020] 3. With the work of the motor, the oil pressure in the pipeline in the hydraulic pump body gradually increases, which makes the oil injection side pressure of the liquid injection cavity greater than the air injection side pressure. At this time, the isolation rubber layer is pushed by the hydraulic oil, and the core valve and the valve post head move together. With the movement of the valve post head, the button is separated from the valve post head, the button is disconnected from the power supply of the motor, the hydraulic pump body stops working, and damage caused by the continuous work of the hydraulic pump body after self-sealing is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view structural schematic diagram of the utility model;

[0022] Figure 2 It is a side view structural schematic diagram of the hydraulic pump and the first end cover of the utility model;

[0023] Figure 3 It is the cross-section structure schematic view of the hydraulic pump and the first end cover of the utility model;

[0024] Figure 4 It is the three-dimensional structure schematic view of the core valve and the valve post head connection of the utility model;

[0025] Figure 5 It is the three-dimensional cross-section structure schematic view of the isolation rubber layer and the core valve of the utility model;

[0026] Figure 6 It is the three-dimensional structure schematic view of the top cap and the spring of the utility model.

[0027] In the drawing: 1, motor; 2, shaft coupling; 3, hydraulic pump body; 4, liquid inlet; 5, first end cover; 6, adjusting bolt; 7, gas injection valve; 8, air pressure gauge; 9, gas injection pipe; 10, top cap; 11, spring; 12, liquid injection cavity; 13, isolation rubber layer; 14, core valve; 15, first discharge port; 16, same discharge port; 17, liquid discharge port; 18, valve post head; 19, second end cover; 20, button; 21, screw into base. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] Please refer to Figures 1-6The utility model provides a kind of technical scheme: a kind of hydraulic pump with overpressure self-closing, including motor 1, the side of motor 1 is provided with hydraulic pump body 3, and the input end of hydraulic pump body 3 is fixedly connected with the output end of motor 1 between coupling 2, and the end side surface of hydraulic pump body 3 is provided with inlet 4, and hydraulic pump body 3 and motor 1 are concentric design, and the end of hydraulic pump body 3 away from inlet 4 is fixedly provided with injection liquid chamber 12, and the inside of injection liquid chamber 12 is slidably installed with core valve 14, and sealing ring is arranged between core valve 14 and hydraulic pump body 3, and the end side surface of core valve 14 is attached with the inner surface of hydraulic pump body 3, and the inside of hydraulic pump body 3 is provided with sliding closure structure, and sliding closure structure makes automatic closing passage when pressure exceeds limit value, and sliding closure structure includes: first discharge port 15, first discharge port 15 penetrates the side surface of injection liquid chamber 12, and the side of hydraulic pump body 3 close to inlet 4 is fixedly installed with first end cover 5, and first end cover 5 and hydraulic pump body 3 are provided with isolation rubber layer 13, and isolation rubber layer 13 is fixedly installed at the end of core valve 14 inside injection liquid chamber 12, and the outer one of isolation rubber layer 13 is provided with annular projection, and the inside of hydraulic pump body 3 is provided with cavity, and the end of hydraulic pump body 3 away from first discharge port 15 is provided with same discharge port 16, and same discharge port 16 is connected with the cavity of hydraulic pump body 3, and the side surface of hydraulic pump body 3 is provided with liquid discharge port 17.

[0030] With the start of motor 1, motor 1 will transmit mechanical energy to hydraulic pump body 3 through coupling 2, and through the rotation of hydraulic pump body 3, hydraulic oil is pumped into the inside of hydraulic pump body 3 through inlet 4, and then passes through first discharge port 15 and same discharge port 16, and cooperates with liquid discharge port 17 to discharge hydraulic oil to execution element, with the work of execution element, the oil pressure in the pipeline of hydraulic pump body 3 gradually rises, at this time, first discharge port 15 connected with same discharge port 16 will push isolation rubber layer 13 as the oil pressure rises, so that isolation rubber layer 13 moves with core valve 14 and valve post head 18, and same discharge port 16 and liquid discharge port 17 are blocked and closed, so that the pipeline of hydraulic pump body 3 is closed and disconnected to stop oil injection.

[0031] The end of first end cover 5 is provided with adjusting mechanism, and the air pressure required when pipeline is closed is controlled by adjusting mechanism, and adjusting mechanism includes: air injection valve 7, air injection valve 7 is fixedly installed at one end of air injection pipe 9, and air injection pipe 9 is installed through the side surface of first end cover 5, and air injection pipe 9 is connected to the end of injection liquid chamber 12 away from isolation rubber layer 13, and air injection valve 7 is fixedly installed with air pressure gauge 8 at one end side surface, and one end of air injection valve 7 is connected with air pressure pump.

[0032] By starting the air pressure pump, the gas injection pipe 9 connected with the air pressure pump injects gas to one side of the liquid injection cavity 12. By observing the value of the air pressure gauge 8, it can be known how much gas is injected into the liquid injection cavity 12. When the air pressure injected into the liquid injection cavity 12 is sufficient, the gas injection valve 7 can be closed to maintain the pressure. The difference between the oil pressure and the air pressure on both sides of the isolation rubber layer 13 in the liquid injection cavity 12 controls and adjusts the upper limit pressure of the oil passage pipeline self-sealing, so that the upper limit pressure can be adjusted.

[0033] The side surface of the first end cover 5 is screw-mounted with an adjusting bolt 6, and the end of the adjusting bolt 6 inside the hydraulic pump body 3 is provided with a top cap 10, and the top cap 10 is rotationally connected with the adjusting bolt 6. The spring 11 is arranged between the top cap 10 and the isolation rubber layer 13.

[0034] By rotating the adjusting bolt 6 to drive the top cap 10 and the spring 11 to move, the isolation rubber layer 13 is finely adjusted. At the same time, the spring 11 can prevent the oil pressure of the isolation rubber layer 13 from being too large, which may cause the isolation rubber layer 13 to tear.

[0035] The end of the core valve 14 away from the first end cover 5 is screw-mounted with a valve post head 18, and the diameter of the valve post head 18 is the same as that of the core valve 14. The end of the valve post head 18 close to the isolation rubber layer 13 is designed as a circular truncated cone, and the side surface of the valve post head 18 is in close contact with the side surface of the hydraulic pump body 3, and the hydraulic pump body 3 is slidingly connected with the valve post head 18.

[0036] By opening the first end cover 5 and the second end cover 19 on both sides of the hydraulic pump body 3, and then unscrewing the core valve 14 and the valve post head 18, the isolation rubber layer 13, the core valve 14 and the valve post head 18 worn out after long-term use can be replaced, the air tightness of the hydraulic pump body 3 is improved, and the hydraulic pump body 3 can be more easily repaired.

[0037] The second end cover 19 is fixedly installed on the side of the hydraulic pump body 3 away from the air pressure gauge 8, and the side surface of the second end cover 19 is screw-mounted with a screw-in base 21. The side of the screw-in base 21 close to the core valve 14 is fixedly installed with a button 20, and the side surface of the button 20 is in close contact with the side surface of the valve post head 18. When the button 20 is in contact with the valve post head 18, it is set as a long closed state, and the button 20 is connected with the motor 1.

[0038] With the operation of the hydraulic pump body 3, the hydraulic oil is drawn into the inside of the hydraulic pump body 3 through the liquid inlet 4. Then, with the work of the actuator, the pressure in the pipeline of the hydraulic pump body 3 gradually rises, pushing the isolation rubber layer 13, driving the core valve 14 and the valve post head 18 to move, so that the valve post head 18 is separated from the button 20. The button 20 disconnects the motor 1, so that the motor 1 stops working, preventing the hydraulic pump body 3 from continuing to work after self-sealing, which may cause damage. At the same time, the button 20 can be quickly replaced by being screwed out through the screw-in base 21.

[0039] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic pump with overpressure self-sealing, comprising a motor (1), a hydraulic pump body (3) disposed on one side of the motor (1), and a coupling (2) fixedly connected between the input end of the hydraulic pump body (3) and the output end of the motor (1), and an inlet (4) penetratingly disposed on one side surface of the hydraulic pump body (3), the hydraulic pump body (3) and the motor (1) being concentrically designed, and an injection chamber (12) fixedly opened at one end of the hydraulic pump body (3) away from the inlet (4), a core valve (14) being slidably installed inside the injection chamber (12), and a sealing ring being disposed between the core valve (14) and the hydraulic pump body (3), and one side surface of the core valve (14) being in contact with the inner surface of the hydraulic pump body (3), characterized in that: The hydraulic pump body (3) is internally provided with a sliding closure structure, which automatically closes the passage when the pressure exceeds a limit value.

2. A hydraulic pump provided with overpressure self-closing according to claim 1, characterized in that: The sliding closure structure comprises: a first discharge port (15) penetrating through the side surface of the liquid injection cavity (12), a first end cover (5) fixedly installed on the side of the hydraulic pump body (3) close to the liquid inlet (4), an isolation rubber layer (13) provided between the first end cover (5) and the hydraulic pump body (3), and the isolation rubber layer (13) fixedly installed on one end of the core valve (14) inside the liquid injection cavity (12), a circular ring-shaped protrusion provided on the outer side of the isolation rubber layer (13), a cavity provided in the hydraulic pump body (3), a same discharge port (16) opened on the end of the hydraulic pump body (3) away from the first discharge port (15), the same discharge port (16) connected with the cavity of the hydraulic pump body (3), and a liquid discharge port (17) penetrating through the side surface of the hydraulic pump body (3).

3. A hydraulic pump provided with an overpressure self-closing according to claim 2, characterized in that: One end of the first end cover (5) is provided with an adjusting mechanism for controlling the required air pressure when the pipeline is closed.

4. A hydraulic pump provided with an overpressure self-closing according to claim 3, characterized in that: The adjusting mechanism comprises: a gas injection valve (7) fixedly installed on one end of a gas injection pipe (9), the gas injection pipe (9) penetratingly installed on the side surface of the first end cover (5), and the gas injection pipe (9) penetrating into the end of the liquid injection cavity (12) away from the isolation rubber layer (13), an air pressure gauge (8) fixedly installed on the side surface of one end of the gas injection valve (7), and one end of the gas injection valve (7) connected with an air pressure pump.

5. A hydraulic pump provided with an overpressure self-closing according to claim 2, characterized in that: The side surface of the first end cover (5) is threadedly installed with an adjusting bolt (6), one end of the adjusting bolt (6) inside the hydraulic pump body (3) is provided with a top cap (10), the top cap (10) is rotationally connected with the adjusting bolt (6), and a spring (11) is provided between the top cap (10) and the isolation rubber layer (13).

6. A hydraulic pump provided with overpressure self-closing according to claim 2, characterized in that: One end of the core valve (14) away from the first end cover (5) is threadedly installed with a valve stud (18), the diameter of the valve stud (18) is the same as that of the core valve (14), the end of the valve stud (18) close to the isolation rubber layer (13) is designed in a circular truncated cone shape, the side surface of the valve stud (18) is in close contact with the side surface of the hydraulic pump body (3), and the hydraulic pump body (3) is slidingly connected with the valve stud (18).

7. A hydraulic pump provided with overpressure self-closing according to claim 1, characterized in that: The side of the hydraulic pump body (3) away from the air pressure gauge (8) is fixedly installed with a second end cover (19), the side surface of the second end cover (19) is threadedly installed with a screw-in base (21), the side of the screw-in base (21) close to the core valve (14) is fixedly installed with a button (20), the side surface of the button (20) is in close contact with the side surface of the valve stud (18), the button (20) is in long closed state when in contact with the valve stud (18), and the button (20) is connected with the motor (1).

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