A micro axial plunger hydraulic unit

Abstract

The utility model discloses a kind of miniature axial plunger hydraulic units, including motor, plunger pump and oil cup;Plunger pump one side is connected motor;Plunger pump other side is connected with oil cup;Plunger pump includes valve block and is set on the overflow valve of valve block, hydraulic lock and shuttle valve;Oil cup is connected with plunger pump group by shuttle valve;Plunger pump is connected with hydraulic lock by overflow valve;Shuttle valve is connected with hydraulic lock.This device compact structure, size and weight are small: using axial plunger pump, high pressure output can be realized under small volume.High interchangeability of component: due to the structural characteristics of axial plunger pump, flow can be adjusted by changing plunger quantity and stroke, so that different flow hydraulic unit can use general component, thereby reducing manufacturing cost, convenient maintenance.30MPa pressure grade can be reached, meet the high pressure demand of small hydraulic drive device.Through motor commutation, the pressure switching of two output ports can be realized, so as to control the forward and reverse motion of external actuator.

Description

Technical Field

[0001] This utility model relates to a miniature axial piston hydraulic unit, belonging to the field of marine application technology. Background Technology

[0002] Currently, there are two main types of miniature hydraulic units on the market: radial piston hydraulic units and gear pump hydraulic units.

[0003] A gear pump hydraulic unit is a hydraulic unit with a gear pump as its core component. Due to its structural characteristics, gear pumps are large in size, have low efficiency, and low pressure rating.

[0004] A radial piston hydraulic unit is a hydraulic unit with a radial piston as its core component. Due to its structural characteristics, the radial piston pump will have a significantly larger external size when there is a large flow requirement, resulting in a large change in the external size of products in the same series, making it impossible to interchange products with different flow rates. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a miniature axial piston hydraulic unit, thereby solving the aforementioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a miniature axial piston hydraulic unit, including a motor, a piston pump, and an oil cup; one side of the piston pump is connected to the motor; the other side of the piston pump is connected to the oil cup; the piston pump includes a valve block and an overflow valve, a hydraulic lock, and a shuttle valve disposed on the valve block; the oil cup is connected to the piston pump assembly through the shuttle valve; the piston pump is connected to the hydraulic lock through the overflow valve; the shuttle valve is connected to the hydraulic lock, forming a circuit from external hydraulic components back to the oil cup.

[0007] Furthermore, the motor is a reversible motor; the motor can realize the reversing function, the hydraulic oil is output from the power unit B port to the external hydraulic components, and the external hydraulic oil flows back into the power unit A port and passes through the hydraulic lock and shuttle valve to the oil cup.

[0008] Furthermore, the hydraulic lock is a hydraulically controlled check valve, and there are two of them. The two output / input ports of the two hydraulic locks are respectively connected to port A and port B of the power unit to connect to external hydraulic components.

[0009] The beneficial effects of this utility model are: This device boasts a compact structure and small size and weight: Utilizing an axial piston pump, it achieves high-pressure output within a small volume. High component interchangeability: Due to the structural characteristics of the axial piston pump, flow rate can be adjusted by changing the number of pistons and their stroke, allowing hydraulic units with different flow rates to use common components, thereby reducing manufacturing costs and facilitating maintenance. High output pressure: Capable of reaching pressure levels up to 30MPa, meeting the high-pressure requirements of small hydraulic drive devices. Reversible output: Pressure switching between the two output ports can be achieved through motor reversal, thereby controlling the forward and reverse movement of external actuators. Adjustable pressure: The output pressure of the hydraulic unit can be precisely controlled by adjusting the set pressure of the relief valve using an adjusting screw. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model.

[0011] In the diagram: 1. Hydraulic lock, 2. Motor, 3. Piston pump, 4. Shuttle valve, 5. Relief valve, 6. Oil cup. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0014] like Figure 1 , Figure 2 As shown, a miniature axial piston hydraulic unit includes a motor 2, a piston pump 3, and an oil cup 6. The piston pump 3 is connected to the motor 2 on one side and to the oil cup 6 on the other side. The piston pump 3 includes a valve block and an overflow valve 5, a hydraulic lock 1, and a shuttle valve 4 disposed on the valve block. The oil cup 6 is connected to the piston pump assembly 3 through the shuttle valve 4. The piston pump 3 is connected to the hydraulic lock 1 through the overflow valve 5. The shuttle valve 4 is connected to the hydraulic lock 1, forming a circuit from external hydraulic components back to the oil cup 6.

[0015] In this preferred embodiment, motor 2 is a forward and reverse motor; motor 2 can realize the reversing function, and hydraulic oil is output from the power unit B port to the external hydraulic component, and the external hydraulic oil flows back into the power unit A port and passes through the hydraulic lock 1 and shuttle valve 4 to the oil cup 6.

[0016] In this preferred embodiment, the hydraulic lock 1 is a hydraulically controlled one-way valve, and there are two of them. The two output / input ports of the two hydraulic locks 1 are respectively connected to the A port and B port of the power unit to connect to external hydraulic components.

[0017] Working Principle: Normal Operation (Output from Port A): The motor drives the plunger pump, which draws hydraulic oil from the oil cup. The hydraulic oil flows sequentially through the shuttle valve, the plunger pump, and then through the relief valve for pressure limitation. Afterward, the high-pressure hydraulic oil is output from Port A of the power unit through the hydraulic lock, driving external hydraulic components. Hydraulic oil returning from external hydraulic components enters the power unit through Port B, passes through the hydraulic lock and the shuttle valve, and finally flows back to the oil cup. The main function of the relief valve is to limit the maximum pressure of the system and protect the hydraulic system.

[0018] Reverse operation (B port output): Reverses the motor direction, and the piston pump's suction and pressure directions are reversed. Hydraulic oil is output from port B of the power unit to drive external hydraulic components. Hydraulic oil returning from external hydraulic components enters the power unit through port A, passes through the hydraulic lock and shuttle valve, and finally flows back to the oil cup.

[0019] Pressure regulation: By adjusting the adjusting screw on the relief valve, the compression of the spring is changed, thereby altering the set pressure of the relief valve. When the system pressure exceeds the set pressure of the relief valve, the relief valve opens, and some hydraulic oil flows back to the oil cup, thus limiting the system pressure.

[0020] The function of the shuttle valve is to select the hydraulic oil returning from port A or port B and guide it to the oil cup to ensure smooth oil return.

[0021] The function of a hydraulic lock is to prevent hydraulic oil from flowing backward and to ensure that the hydraulic actuator maintains its position when it is stopped.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A miniature axial piston hydraulic unit, characterized in that, The assembly includes a motor (2), a plunger pump (3), and an oil cup (6); one side of the plunger pump (3) is connected to the motor (2); the other side of the plunger pump (3) is connected to the oil cup (6); the plunger pump (3) includes a valve block and an overflow valve (5), a hydraulic lock (1), and a shuttle valve (4) disposed on the valve block; the oil cup (6) is connected to the plunger pump assembly (3) through the shuttle valve (4); the plunger pump (3) is connected to the hydraulic lock (1) through the overflow valve (5); the shuttle valve (4) is connected to the hydraulic lock (1), forming a circuit from external hydraulic components back to the oil cup (6).

2. The miniature axial piston hydraulic unit according to claim 1, characterized in that, The motor (2) is a forward and reverse motor; the motor (2) can realize the reversing function. The hydraulic oil is output from the power unit B port to the external hydraulic components, and the external hydraulic oil flows back into the power unit A port and passes through the hydraulic lock (1) and shuttle valve (4) to the oil cup (6).

3. The miniature axial piston hydraulic unit according to claim 1, characterized in that, The hydraulic lock (1) is a hydraulically controlled check valve, and there are two of them. The two output / input ports of the two hydraulic locks (1) are respectively connected to the A port and B port of the power unit to connect to external hydraulic components.

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