Multi-gear pump with step variable system

Abstract

The utility model relates to a multi-gear pump with step variable system, which belongs to the field of pumps. The purpose of the present invention is to utilize the combination of a plurality of gear pumps with different displacements to realize a multi-gear pump variable system with step adjustment of displacement. The invention includes at least three gear pumps with different displacements and at least three electromagnetic reversing valves, each gear pump has a separate oil discharge port, and the oil discharge port of each gear pump is connected to the oil inlet of the electromagnetic reversing valve. The other two oil ports of the electromagnetic reversing valve communicate with the oil tank and the total oil discharge port respectively. The invention can control the on-off of the electromagnetic reversing valve through a single-chip microcomputer, PLC or computer, and then control whether each gear pump supplies oil to the system, so as to realize the flow control of the system with a small displacement gradient.

Description

technical field [0001] The invention belongs to the field of pumps. Background technique [0002] Hydraulic transmission is a technical science that converts, transmits, distributes and controls energy with liquid as the working medium. It uses the hydraulic pump to convert the mechanical energy of the prime mover into the pressure energy of the liquid, and converts the pressure energy of the liquid into mechanical energy by means of hydraulic actuators (cylinders or motors), thereby driving the working mechanism to achieve linear reciprocating motion and rotary motion. The working mechanism often has various requirements for force and speed, so it needs to be transmitted and distributed through various control valves and pipelines. Hydraulic transmission is widely used in machine tools, automobiles, airplanes, ships, engineering machinery, plastic machinery, testing machinery, metallurgical machinery and mining machinery and other fields due to its incomparable advantages ...

AI Technical Summary

Problems solved by technology

The most common methods are: 1. Use the flow control valve to adjust. The main problem of this method is that the power loss is large, so it is not suitable for high-power applications; 2. Use the variable pump system. Directional piston pump, this flow adjustment method has high efficiency and is widely used in high-power occasions. However, due to the complex structure, low oil pollution resistance, high cost and poor reliability of variable variable piston pumps, for some working conditions It is not completely suitable for occasions with harsh conditions and high reliability requirements

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