Multi-gear pump stepped variable system

Abstract

The invention relates to a multi-gear pump stepped variable system which belongs to the field of pumps. The invention aims at providing a multi-gear pump stepped variable system for realizing stepped regulation of displacement by utilizing the combination of a plurality of gear pumps with different displacements. The multi-gear pump stepped variable system comprises at least three gear pumps with different displacements and at least three electromagnetic reversing valves, wherein each gear pump is provided with an independent oil discharge outlet, the oil discharge outlet of each gear pump is connected with an oil inlet of the electromagnetic reversing valves, and the other two oil ports of the electromagnetic reversing valves are respectively communicated with an oil tank and a main oil discharge port. The on-off of the electromagnetic reversing valves can be controlled by a single-chip machine, a PLC (Programmable Logic Controller) or a computer and the like so that each gear pump is controlled to supply oil to the system or not, thereby realizing that the flow of the system is controlled by utilizing a smaller displacement variation 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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