CN2903475Y

CN2903475Y - Variable pump

Info

Publication number: CN2903475Y
Application number: CN 200620082924
Authority: CN
Inventors: 程江伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-11
Filing date: 2006-04-11
Publication date: 2007-05-23
Anticipated expiration: 2016-04-11

Abstract

The utility model relates to a hydraulic pump, particularly relates to a varying-discharge pump, provided technical proposal that two or more than two constant displacement pumps, a plurality of one-way valves, and a overload protecting valve are constituted by cascade connection and parallel connection. The utility model has beneficial effects that the apparatus is widely applicable to a plurality of hydraulic machinery of hydraulic machinery, engineering machinery, mining, chemical industry, and oil field machinery and the like, and the prior traditional varying-discharge plunger pump can be substituted efficiently, thereby reducing the cost effectively, having good application value of market outlook.

Description

New Variable Displacement Pump

One, technical field:

The utility model relates to a kind of oil hydraulic pump, particularly a kind of New Variable Displacement Pump that significantly reduces cost.

Two, background technique:

At present, employed oil hydraulic pump generally adopts plunger pump, metering pump, screw pump, vane pump and lobed rotor pump etc.But the problem that exists is: when selecting Variable plunger pump for use, required cost is very high, complex structure, pulse is arranged, the maintenance cost height, and exist shortcomings such as medium sensitivities; And when using metering pump separately, then have shortcomings such as rated pressure is low, liquid stream is quantitative.

Three, summary of the invention:

The purpose of this utility model is exactly the above-mentioned defective that exists at prior art, and a kind of New Variable Displacement Pump that can significantly reduce cost, realize the metering pump variable is provided.

Its technological scheme is: two or more metering pumps and a plurality of one-way valve and overload protection valve or solenoid valve are arranged by pipeline series connection with compose in parallel.

A kind of technological scheme is: two metering pumps (A ', B ') are communicated with by overload protection valve (3 '), also are provided with first one-way valve (1 ') in the upper end of metering pump (A '); Node between the lower end of the upper end of overload protection valve (3 ') and metering pump (A ') is communicated with the lower end of metering pump (B ') by the 4th one-way valve (4 '); Node between the upper end of the lower end of overload protection valve (3 ') and metering pump (B ') is communicated with the upper end of first one-way valve (1 ') by second one-way valve (2 ').

A kind of technological scheme is: two metering pumps (A ', B ') are communicated with by overload protection valve (3 '), also are provided with first one-way valve (1 ') in the upper end of metering pump (A '); Node between the lower end of the upper end of overload protection valve (3 ') and metering pump (A ') is communicated with hydraulic oil container by the 4th one-way valve (4 '); Node between the upper end of the lower end of overload protection valve (3 ') and metering pump (B ') is communicated with the upper end of first one-way valve (1 ') by second one-way valve (2 ').

Described overload protection valve (3,3 ') can be relief valve, also can be pressure-limit valve or overload valve, also can adopt solenoid valve to replace; Described metering pump can be in gear pump, vane pump, screw pump, lobed rotor pump, the quantitative plunger pump several arbitrarily.

The beneficial effects of the utility model are: this device can be widely used in the middle of the multiple hydraulic machineries such as multiple hydraulic machinery, engineering machinery and mining, chemical industry and oilfield machinery, can effectively substitute existing traditional Variable plunger pump, therefore can effectively reduce cost, the using value of good market prospects is arranged.

Four, description of drawings:

Accompanying drawing 1 is an a kind of embodiment's of the present utility model structure principle chart.

Five, embodiment:

In conjunction with the accompanying drawings, the utility model will be further described:

Embodiment 1: between hydraulic oil container and performance element, two metering pump A ', B ' are by overload protection valve 3 ' connection, also be provided with in the upper end of metering pump A ' first one-way valve 1 '; Overload protection valve 3 ' the lower end of upper end and metering pump A ' between node by the 4th one-way valve 4 ' be communicated with in the lower end or hydraulic oil container of metering pump B '; Overload protection valve 3 ' the upper end of lower end and metering pump B ' between node by second one-way valve 2 ' be communicated with, first one-way valve 1 ' the upper end.

Wherein, the overload protection valve can be relief valve, also can be used for overcurrent protection for pressure-limit valve or overload valve, can certainly replace with solenoid valve; Described metering pump can be in gear pump, vane pump, screw pump, lobed rotor pump, the quantitative plunger pump several arbitrarily.

Working principle and process are as follows:

The flow of every metering pump output when running well is definite value, and the pressure of output also is definite value; When performance element is higher to required pressure greater than the rating value of any metering pump, second one-way valve and the 4th one-way valve are closed under high pressure liquid stream is impacted voluntarily, first one-way valve and overload protection valve are opened under liquid flow impact voluntarily, thereby realize two metering pump series connection, flow stream pressure is greatly improved in the working connection, and pressure can reach two pump sums;

When the required pressure of performance element hour; two pumps are realized oil suction voluntarily in the course of the work, are pressed the process of oil; the overload protection valve cuts out voluntarily; metering pump A is communicated with oil suction voluntarily by the 4th one-way valve with fuel tank; by the output of the first one-way valve fuel feeding, metering pump B is communicated with second one-way valve, realizes double pump and combined stream; flow in the working connection is effectively improved, and discharge capacity can reach two pump sums.

In addition, the utility model is not limited only to technique scheme, also can for a plurality of metering pumps and a plurality of one-way valve and overload protection valve or solenoid valve by the pipeline series connection with compose in parallel.

Claims

1, a kind of New Variable Displacement Pump is characterized in that: two or more metering pumps and a plurality of one-way valve and overload protection valve are arranged by pipeline series connection with compose in parallel.

2, New Variable Displacement Pump according to claim 1 is characterized in that: two metering pumps (A ', B ') are communicated with by overload protection valve (3 '), also are provided with first one-way valve (1 ') in the upper end of metering pump (A '); Node between the lower end of the upper end of overload protection valve (3 ') and metering pump (A ') is communicated with the lower end of metering pump (B ') by the 4th one-way valve (4 '); Node between the upper end of the lower end of overload protection valve (3 ') and metering pump (B ') is communicated with the upper end of first one-way valve (1 ') by second one-way valve (2 ').

3, New Variable Displacement Pump according to claim 1 is characterized in that: two metering pumps (A ', B ') are communicated with by overload protection valve (3 '), also are provided with first one-way valve (1 ') in the upper end of metering pump (A '); Node between the lower end of the upper end of overload protection valve (3 ') and metering pump (A ') is communicated with hydraulic oil container by the 4th one-way valve (4 '); Node between the upper end of the lower end of overload protection valve (3 ') and metering pump (B ') is communicated with the upper end of first one-way valve (1 ') by second one-way valve (2 ').

4, according to claim 1,2 or 3 described New Variable Displacement Pumps, it is characterized in that: described overload protection valve (3,3 ') can be relief valve, also can be pressure-limit valve or overload valve.

5, according to claim 1,2 or 3 described New Variable Displacement Pumps, it is characterized in that: what described metering pump can be in gear pump, vane pump, screw pump, lobed rotor pump, the quantitative plunger pump is several arbitrarily.