Single plunger pump with active flow distribution

Abstract

The invention provides a single plunger pump for active flow allocation. The single plunger pump comprises a cylinder body, a piston rod and a piston. The cylinder body is divided by the piston into afirst pump cavity and a second pump cavity with the same effective area. The first pump cavity is provided with a first oil suction port and a first oil drainage port. The second pump cavity is provided with a second oil suction port and a second oil drainage port. A control port of a first oil drainage valve and a control port of a second oil suction valve are connected with the first oil drainage port. A control port of a second oil drainage valve and a control port of a first oil suction valve are connected with the second oil drainage port. The first oil suction valve, the second oil suction valve, the first oil drainage valve and the second oil drainage valve are all hydraulic operated directional valves. When the piston rod moves in a reciprocating mode under the drive of a prime motor, the first oil suction valve, the second oil suction valve, the first oil drainage valve and the second oil drainage valve can be automatically opened and closed according to pressure changes to actively achieve the oil suction and oil drainage processes. By applying the technical scheme, the function of outputting high pressure oil outwards in two directions can be achieved, the system structure and the control process are simplified, and system stability is improved.

Description

technical field [0001] The invention relates to the field of hydraulic pumps, in particular to a single plunger pump with active flow distribution. Background technique [0002] The hydraulic system is widely used in various equipment such as industrial and agricultural production and urban construction due to its advantages of high power density, convenient layout, and easy automation. As the driving source of the hydraulic system - the hydraulic pump plays a pivotal role. The plunger pump is a commonly used hydraulic pump, especially widely used in the oil transportation industry, but the general single plunger pump adopts the one-way valve flow distribution method, which is a passive flow distribution method. Only when the pressure in the oil suction chamber is lower than a certain level When the oil suction check valve is opened, and only when the pressure is higher than a certain level, the oil discharge check valve is opened, and there is a certain overlap in the open...

AI Technical Summary

Problems solved by technology

The plunger pump is a commonly used hydraulic pump, especially widely used in the oil transportation industry, but the general single plunger pump adopts the one-way valve flow distribution method, which is a passive flow distribution method. Only when the pressure in the oil suction chamber is lower than a certain level The oil suction check valve opens only when the pressure is higher than a certain level, and the oil discharge check valve opens only when the pressure is higher than a certain level, and there is a certain overlap between the opening times of the two, which seriously affects the effective oil suction and oil discharge strokes.

In addition, the one-way valve flow distribution method has a better response speed under the condition of small flow rate, but for the plunger pump with large flow rate, the response of the one-way valve becomes worse, and the phenomenon of one-way valve closing or opening hysteresis is very easy to occur.

In the prior art, there is a structure that uses a rotary valve for flow distribution, but the rotary valve itself has a relatively large leakage, so there are also major deficiencies; or an electromagnetic reversing valve is used for flow distribution, but this requires that the electromagnetic reversing valve has a relatively large capacity. The high response speed meets the high-frequency operation of the single plunger pump, and it is necessary to use sensors to detect the movement displacement of the piston to generate the control signal of the solenoid valve, which has high requirements for the accuracy of the sensor and the rapidity of the control strategy. Make the input cost and maintenance cost of the system remain high for a long time

Images