Inlet pressurizing type two-dimensional duplex piston pump

Abstract

The invention discloses an inlet pressurizing type two-dimensional duplex piston pump comprising a pump body. The pump body is provided with an oil suction opening and an oil discharge opening. A pumpunit is arranged in the pump body and comprises two cylinder blocks fixed into the pump body. The two cylinder blocks are arranged in the left-right direction. Pistons are both arranged in the two cylinder blocks, and the two pistons are in mutual linkage. The center axis of each cylinder block coincides with the center axis of the corresponding piston. The two ends of each piston are both provided with moving components, wherein the moving components drive the piston to axially move so as to cause the volume of a work cavity to change. The piston motion driving directions of the two moving components at the two ends of each piston are opposite. Each piston, the corresponding cylinder block and the moving components on the two sides of the piston constitute one half part of the duplex structure of the piston pump, the part close to a front end cover is the upper half part of the duplex structure of the piston pump, and the part close to a back end cover is the lower half part of the duplex structure of the piston pump. According to the inlet pressurizing type two-dimensional duplex piston pump, the double-freedom-degree structure of rotation and sliding of the pistons is used forreplacing an oil distributing disk structure of a traditional circumferential plunger pump, and continuous oil suction and discharge functions are achieved; besides, the duplex mode is adopted, if thepistons rotate for one circle, reciprocating motion is conducted four times, oil suction and oil discharge are each conducted eight times, and the number of times of oil suction and the number of times of oil discharge are each four larger than those of a monoblock piston pump.

Description

technical field [0001] The invention relates to an inlet pressurized two-dimensional double-connected piston pump, belonging to hydraulic pumps and hydraulic motors in the field of fluid transmission and control. Background technique [0002] The plunger (piston) pump uses a plunger (piston) and a cylinder block as the main working components. When the plunger (piston) reciprocates in the plunger (piston) hole of the cylinder, the volume of the closed working volume chamber composed of the plunger (piston) and the cylinder changes, and the suction and discharge process is completed. According to the different arrangements of the plunger (piston) in the cylinder, the plunger (piston) pump is divided into two categories: radial type and axial type. [0003] The traditional common axial plunger (piston) pump relies on the reciprocating movement of the plunger (piston) in the cylinder to change the volume of the sealed working chamber to achieve oil suction and pressure. There...

AI Technical Summary

Problems solved by technology

There are many relatively moving parts inside, high requirements on material and machining accuracy, sensitive to oil pollution, high requirements and costs for processing, use, and maintenance, and expensive; the cylinder rotates with the transmission shaft, and the moment of inertia is large, resulting in The response speed of start, stop, and speed regulation is slow, which is not conducive to controlling the output flow of the pump through speed regulation; there are many friction pairs in the cylinder body, and the cylinder temperature rises faster under high-speed rotation, and the valve plate, plunger (piston) The wear and tear of other parts directly affects the service life and durability of the pump

In addition, due to the limitation of the working principle of the plunger (piston) pump itself, each plunger (piston) can only achieve one oil suction and one oil discharge when the transmission shaft rotates one revolution. Design the flow distribution mechanism to complete the switching of oil suction and discharge in the working chamber

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