Reverse protection two-way open type pump

Abstract

The utility model belongs to the technical field of hydraulic pumps, and discloses a reverse protection two-way open type pump which is characterized by comprising a pump base body and a protection valve set, the pump base body comprises a transmission shaft, a rotor assembly, a variable set and a pump cover, oil outlets B are formed in the left side and the right side of the pump cover, an oil suction opening S is formed in the lower side of the pump cover, and the protection valve set is arranged on the transmission shaft. The variable set comprises a left end cover, a right end cover, a variable piston and a swash plate, the left end cover and the right end cover are symmetrically distributed on the two sides of the top of the pump base body, the variable piston is installed between the left end cover and the right end cover and can horizontally move left and right under the constraint of the left end cover and the right end cover, and the protection valve set is installed on the end face of the pump cover. And two flow channels of the protection valve group are respectively communicated with an oil outlet B and an oil suction opening S on the pump cover. By arranging the variable set, the protective valve set, the transmission shaft, the rotor assembly, the variable piston, the left end cover, the right end cover and the pump cover, the open type pump can also be applied to the working condition that the main shaft needs to rotate bidirectionally, the limitation of a hydraulic pump of an open type loop is reduced, and the use range of the open type pump is widened.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic pump technology, specifically relating to a bidirectional open pump with reverse protection. Background Technology

[0002] A hydraulic pump is a device that converts mechanical energy into hydraulic energy. It is the core power component in a hydraulic system and is usually driven by an engine or electric motor. For open-type pumps, oil is drawn from the hydraulic tank, pressurized, and discharged to supply the actuators of the hydraulic system.

[0003] Hydraulic pumps used in open circuits are basically unidirectional rotating spindles, with the pump's inlet and outlet ports remaining unchanged. The inlet port is always the inlet port, and the outlet port is always the outlet port. They cannot be used in situations where the drive shaft needs to rotate in both directions. Alternatively, a closed circuit and closed pump can be used, which has certain limitations. Utility Model Content

[0004] The purpose of this invention is to provide a bidirectional open pump with reverse protection to solve the problem that existing open pumps cannot be applied to working conditions where the spindle needs to rotate in both directions, thus having certain limitations.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bidirectional open pump with reverse protection, characterized in that it includes: a pump base and a protective valve assembly. The pump base includes a drive shaft, a rotor assembly, a variable valve assembly, and a pump cover. The pump cover has oil outlets B on its left and right sides and an oil suction port S on its lower side. The variable valve assembly includes a left end cover, a right end cover, a variable piston, and a swashplate. The left and right end covers are symmetrically distributed on the top sides of the pump base. A variable piston is installed between the left and right end covers. The variable piston can move horizontally left and right under the constraint of the left and right end covers. The protective valve assembly is installed on the end face of the pump cover. The two flow channels of the protective valve assembly are respectively connected to the oil outlets B and S on the pump cover.

[0006] Preferably, the protection valve assembly includes a cartridge valve, a cartridge valve body, and a valve body end cap. The cartridge valve body is installed on one side end face of the pump cover, the cartridge valve is installed inside the cartridge valve body, and the upper end of the cartridge valve is sealed and fixed by the valve body end cap.

[0007] Preferably, a swash plate is installed inside the pump base. One side of the swash plate is connected to the middle of the variable piston through a slider mechanism. The variable piston can move symmetrically left and right, causing the swash plate to tilt to the left or right at a certain angle.

[0008] Preferably, the drive shaft and rotor assembly can rotate clockwise or counterclockwise along the axial direction.

[0009] Preferably, the clockwise or counterclockwise rotation of the drive shaft and rotor assembly, combined with the left and right tilting of the swashplate, ensures that the pump always draws oil from a single suction port S and discharges oil from a single outlet B. This ensures that the pump's inlet and outlet oil paths remain unchanged regardless of the direction of rotation of the drive shaft.

[0010] Preferably, the channel of the oil outlet B is connected to the upper end of the cartridge valve, and the channel of the oil inlet S is connected to the lower end of the cartridge valve. When the rotation direction of the pump drive shaft does not match the swing angle of the swashplate, there will be a tendency for oil to be drawn from the oil outlet B and discharged from the oil inlet S. In this case, the cartridge valve will open to balance the pressure of the inlet and outlet, thus preventing the pump flow direction from being incorrect.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] (1) By setting up a pump base and a protective valve group, this utility model enables open pumps to be applied to working conditions where the main shaft needs to rotate in both directions, reducing the limitations of open pumps and expanding the application range of open pumps.

[0013] (2) By setting up a cartridge valve and a cartridge valve body structure, this utility model can prevent the oil flow direction from being wrong during the continuous operation of the pump, thereby effectively protecting the entire hydraulic circuit and improving the safety of the pump body during use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural view of the present invention;

[0016] In the diagram: 1. Pump base; 2. Protective valve assembly; 3. Drive shaft; 4. Swashplate; 5. Variable piston; 6. Pump cover; 7. Cartridge valve; 8. Cartridge valve body; 9. Left end cover; 10. Right end cover; 11. Valve body end cover; 12. Rotor assembly. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 and Figure 2As shown, this utility model provides the following technical solution: a bidirectional open pump with reverse protection, comprising: a pump base 1 and a protection valve group 2. The pump base 1 includes a drive shaft 3, a rotor assembly 12, a variable valve group, and a pump cover 6. Oil outlets B are provided on the left and right sides of the pump cover 6, and an oil suction port S is provided on the lower side of the pump cover 6. The variable valve group includes a left end cover 9, a right end cover 10, a variable piston 5, and a swashplate 4. The left end cover 9 and the right end cover 10 are symmetrically distributed on the top two sides of the pump base 1. A variable piston 5 is installed between the left end cover 9 and the right end cover 10. The variable piston 5 can move horizontally left and right under the constraint of the left end cover 9 and the right end cover 10. The protection valve group 2 is installed on the end face of the pump cover 6. The two flow channels of the protection valve group 2 are respectively connected to the oil outlet B and the oil suction port S on the pump cover 6.

[0019] Through the above technical solution:

[0020] Specifically, in use, the variable piston 5 is pushed to one side by high-pressure oil through the left end cover 9 and the right end cover 10, which are sealed on both sides. The drive shaft 3 rotates clockwise, matching the variable piston 5 to move to the left. At this time, oil is drawn from the suction port S and discharged from the outlet port B. Since the pressure at the outlet port B is higher than that at the suction port S, the protective valve group 2 is tightly closed under the action of the pressure difference. Therefore, the outlet port B and the suction port S are not connected. Similarly, the drive shaft 3 rotates counterclockwise, matching the variable piston 5 to move to the right. At this time, oil is drawn from the suction port S and discharged from the outlet port B. The pressure at the outlet port B is higher than that at the suction port S. Therefore, the cartridge valve 7 is still tightly closed, and the outlet port B and the suction port S are not connected. This allows the open pump to be applied to working conditions where the main shaft needs to rotate in both directions.

[0021] Further embodiments are provided in this utility model, see below. Figure 2 The reverse protection valve component 2 includes a cartridge valve 7, a cartridge valve body 8, and a valve body end cap 11. The cartridge valve body 8 is installed on one side of the pump cover 6, and the cartridge valve 7 is installed inside the cartridge valve body 8. The upper end of the cartridge valve 7 is sealed and fixed by the valve body end cap 11. The upper end of the cartridge valve 7 is connected to the oil outlet B channel, and the lower end of the cartridge valve 7 is connected to the oil suction port S channel.

[0022] Through the above technical solution:

[0023] Specifically, during operation, if the drive shaft 3 rotates clockwise while the variable piston 5 moves to the right, oil should be discharged from the suction port S and drawn from the outlet port B. However, if the pressure at the outlet port B is lower than that at the suction port S, the cartridge valve 7 will immediately open, connecting the outlet port B and the suction port S. This forces the inlet and outlet pressures to be the same, protecting the low-pressure suction port S and preventing oil from being drawn from the outlet port B. If the pump continues to run, the oil will circulate between the inlet and outlet ports, neither drawing oil from the outside nor discharging oil to the outside, thus protecting the entire hydraulic circuit.

[0024] Reference Figure 2 The pump base 1 is equipped with a swashplate 4. The rotation center of the swashplate 4 has a deflection angle indicator, which can display the swing angle state of the swashplate 4.

[0025] Through the above technical solution:

[0026] Specifically, by setting up swashplate 4, the direction of oil flow at the inlet and outlet can be determined by whether its swashplate angle matches the rotation direction of the drive shaft 3.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bidirectional open pump with reverse protection, characterized in that, include: The pump base (1) and the protective valve assembly (2) are provided. The pump base (1) includes a drive shaft (3), a rotor assembly (12), a variable valve assembly, and a pump cover (6). The pump cover (6) has an oil outlet B on its left and right sides and an oil suction port S on its lower side. The variable valve assembly includes a left end cover (9), a right end cover (10), a variable piston (5), and a swashplate (4). The left end cover (9) and the right end cover (10) are symmetrically distributed on the top two sides of the pump base (1). A variable piston (5) is installed between the left end cover (9) and the right end cover (10). The variable piston (5) can move horizontally left and right under the constraint of the left end cover (9) and the right end cover (10). The protective valve assembly (2) is installed on the end face of the pump cover (6). The two flow channels of the protective valve assembly (2) are respectively connected to the oil outlet B and the oil suction port S on the pump cover (6).

2. The bidirectional open pump with reverse protection according to claim 1, characterized in that: The protective valve assembly (2) includes a cartridge valve (7), a cartridge valve body (8), and a valve body end cap (11). The cartridge valve body (8) is installed on one side end face of the pump cover (6), and the cartridge valve (7) is installed inside the cartridge valve body (8). The upper end of the cartridge valve (7) is sealed and fixed by the valve body end cap (11).

3. The bidirectional open pump with reverse protection according to claim 1, characterized in that: The pump base (1) is equipped with a swashplate (4). One side of the swashplate (4) is connected to the middle of the variable piston (5) through a slider mechanism. The variable piston (5) can move symmetrically left and right, causing the swashplate (4) to tilt to the left or right at a certain angle.

4. A bidirectional open pump with reverse protection according to claim 1, characterized in that: The drive shaft (3) and rotor assembly (12) can rotate clockwise or counterclockwise along the axial direction.

5. A bidirectional open pump with reverse protection according to claim 2, characterized in that: The clockwise or counterclockwise rotation of the drive shaft (3) and the rotor assembly (12) combined with the left and right tilting of the swashplate (4) can ensure that the pump always draws oil from the only oil inlet S and discharges oil from the only oil outlet B. In other words, the pump's oil inlet and outlet paths remain unchanged regardless of the rotation direction of the drive shaft (3).

6. A bidirectional open pump with reverse protection according to claim 5, characterized in that: The channel of the oil outlet B is connected to the upper end of the cartridge valve (7), and the channel of the oil inlet S is connected to the lower end of the cartridge valve (7). When the rotation direction of the pump drive shaft (3) does not match the swing angle direction of the swashplate (4), there will be a tendency to draw oil from the oil outlet B and discharge oil from the oil inlet S. Then the cartridge valve (7) will open to balance the pressure of the inlet and outlet, thus eliminating the state of incorrect pump flow direction.

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