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Plunger piston combined type digital variable pump

A digital variable and combined technology, applied in the direction of pump control, liquid variable displacement machinery, machine/engine, etc., can solve the problem that the frequency response is difficult to meet the work requirements, and achieve the system with small pressure loss, simple structure, and overcoming frequency The effect of low response

Active Publication Date: 2015-12-09
王林翔
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For large-flow proportional servo systems, due to the large hydraulic force, the control of proportional valves or servo valves needs to be realized by multi-stage pilot valves, and its frequency response is difficult to meet the actual work requirements.

Method used

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  • Plunger piston combined type digital variable pump

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Effect test

Embodiment Construction

[0025] The design idea of ​​the present invention is illustrated below through a schematic diagram.

[0026] Such as figure 1 As shown, the plunger combined digital variable hydraulic pump of the present invention consists of seven two-position two-way cut-off solenoid valves 1, seven oil suction one-way poppet valves 2, seven oil pressure one-way valves 3, seven plungers 4 , and the plunger return spring 5, the eccentric wheel 6 and the pump body 7 are composed.

[0027] The structure of the whole system is: all the plungers are driven by the eccentric wheel against the force of the return spring, the oil suction port of each plunger is connected with the oil tank, and the connection mode of the oil discharge port of the plunger is determined according to the actual needs. The working volume corresponding to each plunger is connected to the oil tank by a two-position two-way stop type solenoid valve.

[0028] When the digital variable pump is working, the motor drives the e...

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Abstract

The invention discloses a plunger piston combined type digital variable pump. The plunger piston combined type digital variable pump consists of a plurality of plunger pistons, a plurality of oil absorption check valves, a plurality of oil discharge check valves, and a plurality of two-position two-way electromagnetic stop valves, wherein an oil absorption opening of each plunger piston communicates with an oil tank through the oil absorption check valves; an oil pressure opening of each plunger piston communicates with a high-pressure oil path through an oil pressure check valve; and the oil pressure opening of each plunger piston carries out bypass through the two-position two-way electromagnetic stop valves. In work, actual displacement of the digital variable pump is obtained by summing up displacement of all plunger pistons which normally discharge oil; the control on the displacement is realized by regulating the displacement corresponding to single plunger piston through an solenoid valve, so that the displacement changes of the digital variable pump are very quick in response to input of an electric signal, and therefore, requirements of high-frequency response control are satisfied. The plunger piston combined type digital variable pump can be used for effectively solving the defects such as large pressure loss, low frequency response and the like in a large-flow servo and proportional electric hydraulic control system, and achieves the great energy-saving effect.

Description

technical field [0001] The invention relates to a plunger combined digital variable hydraulic pump. More precisely, it relates to a digital control for realizing the instantaneous displacement of a hydraulic pump by utilizing the oil discharge combination control of multiple plungers. Background technique [0002] The current electro-hydraulic control system widely uses components such as proportional valves or servo valves to achieve servo and proportional control, but such technical solutions have obvious shortcomings: [0003] 1. Large pressure loss and low energy utilization efficiency. Since the basic principle of the valve control scheme is to use the principle of throttling and speed regulation, its disadvantages are throttling loss, large energy consumption, and serious system heating, resulting in instability or failure of the hydraulic system. Especially for the large flow proportional servo system, the pressure loss is particularly serious. [0004] 2. Low freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/22
Inventor 王林翔
Owner 王林翔
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