Plunger pump with energy recycling function

Abstract

The invention discloses a plunger pump with the energy recycling function. The plunger pump comprises a variable pump body (2), a reset cylinder (1), a variable cylinder (3), a tilting tray angle changing feedback mechanism (10), a pressure control unit, a valve device and an electric proportional valve Y II (8). The valve device is used for selecting a pump control oil path and a motor control oil path. One oil port of the valve device is connected with the electric proportional valve Y II (8), and the other oil port of the valve device is connected with a pressure control unit. The variable pump body (2) is provided with a tilting tray. The pressure control unit is composed of a pressure stop valve and a load-sensitive flow control valve. The dual functions of a pump and the function of a motor can be achieved for the plunger pump through the both-way swinging of the tilting tray under the condition that the rotating direction of a main shaft and a high-pressure oil port are not changed. The load-sensitive pressure difference control, the constant-pressure cut-off control and the fixed displacement control can be achieved when the plunger pump serves as the pump in use. The electromagnetic proportional displacement control can be achieved when the plunger pump serves as the motor, and free switching between the function of the pump and the function of the motor can be achieved through the valve device.

Description

technical field [0001] The invention relates to a plunger pump with energy recovery function. Background technique [0002] In the swash plate type axial piston variable displacement pump, when the transmission shaft is in a constant direction of rotation (left-handed or right-handed) and the high-pressure oil port remains unchanged, if you want to switch between the pump working condition and the motor working condition, you only need to The inclination angle of the swash plate can be changed from a positive angle to a negative angle. Closed pumps work similarly. [0003] In the current hydraulic components, pump motor products used in open circuits, such as a special hydraulic pump A4VSO from Rexroth, [0004] The plunger pump uses a double-acting plunger cylinder to push the swing angle of the swash plate to change between a°→0→-a°, and the precise control of the displacement can be realized through a set of complex mechanical-electrical-hydraulic servo mechanism. , th...

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Problems solved by technology

[0004] The plunger pump uses a double-acting plunger cylinder to push the swing angle of the swash plate to change between a°→0→-a°, and the precise control of the displacement can be realized through a set of complex mechanical-electrical-hydraulic servo mechanism. , this pump can achieve energy recovery function, however, the cost is very high

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