CN2760285Y

CN2760285Y - Fine adjustment plunger pump

Info

Publication number: CN2760285Y
Application number: CN 200420103337
Authority: CN
Inventors: 李伯卿
Original assignee: ZHUHAI LUTIAN MACHINERY CO Ltd
Current assignee: ZHUHAI LUTIAN MACHINERY CO Ltd
Priority date: 2004-12-30
Filing date: 2004-12-30
Publication date: 2006-02-22
Anticipated expiration: 2014-12-30

Abstract

The utility model relates to a fine adjustment plunger pump with pre-adjustable output, which comprises a pump body that is provided with a plunger cavity, wherein the plunger cavity is provided with two ports which are communicated with the outer part of the pump body and can be opened or closed, one of the two ports is used as an inlet and the other one of the two ports is used as an outlet. Besides, the pump body is provided with an adjusting cavity inside, and the adjusting cavity is parted from the plunger cavity by a flexible partition wall, the movement of which does not consume any energy which is desired when a spring is compressed and is provided with a normally open port which is communicated with the outer part of the pump body. In addition, the adjusting cavity is provided with a cavity capacity pre-adjusting mechanism inside, and the cavity capacity pre-adjusting mechanism is used for pre-setting the size of the adjusting cavity.

Description

The accurate adjustment plunger pump

Technical field

The utility model relates to plunger pump, particularly a kind of architecture advances export preregulated accurate adjustment plunger pump.

Background technique

Fluid is often used plunger pump from a row to the occasion at another place, this type of pump delivery is fixed, when needs change discharge capacity, usually take to change the pump of different displacements specification or change the different size cylinder body and piston is adjusted the plunger pump delivery, such scheme implementation cost is higher, troublesome poeration, the while can not be realized the step-less adjustment of discharge capacity.

China utility model patent specification CN2594502Y discloses a kind of pressure pump discharge capacity stepless regulator, it includes Master cylinder body, main piston, with suction sap cavity pick-up tube and liquid-discharging tube even, this device also includes an auxiliary cylinder block, an auxiliary piston is arranged in the auxiliary cylinder block inner chamber, the chamber is regulated for suction liquid in the front portion of auxiliary cylinder block, the suction sap cavity that suction liquid is regulated chamber and Master cylinder body front portion links, between the rear wall of the rear portion of auxiliary piston and auxiliary cylinder block, a pressure spring is arranged, also have a positive stop simultaneously at the rear of auxiliary piston.This scheme solved can the step-less adjustment discharge capacity problem, but the deficiency that also has following several aspects, the one, adopt the mechanism of the limiting stopper formation of auxiliary cylinder block, auxiliary piston, pressure spring and auxiliary piston to realize the discharge capacity adjusting, structure is comparatively complicated, and technological requirement is higher; The 2nd, the adjustment process of restriction discharge capacity is the compression process of pressure spring, exhaust certain quantity of energy.Simultaneously, because of there is resistance in the auxiliary piston operation, when the main piston motion frequency was higher, auxiliary piston can not keep synchronously, and the precision of flow is regulated in influence.

Summary of the invention

Main purpose of the present utility model provides the accurate adjustment plunger pump that a kind of structure is simple relatively, reliability is high, the processing technology requirement is low;

Another purpose of the present utility model provides a kind of accurate adjustment plunger pump that need not extra power consumption.

For this reason, the accurate adjustment plunger pump that the utility model provides comprises the pump housing with piston cavity, piston cavity is provided with two passwaies that are interlinked to the outside and selectively open and close with the pump housing, one as import, another is as outlet, also be provided with the adjusting chamber that is separated by a flexible partition wall between and piston cavity in the pump housing, the energy consumption that the moving of flexible partition wall needs when not expending similar pressure spring, regulating the chamber is provided with the pump housing is interlinked to the outside and often opens the road junction, regulate also being provided with a chamber appearance preconditioning mechanism in the chamber, be used for setting in advance the size of regulating the chamber.

By above scheme as seen, such scheme has only adopted a simple flexible partition wall, an adjusting chamber and a chamber to hold preconditioning mechanism, and technological requirement is relatively low, changes discharge capacity by flexible partition wall, need not consumes energy substantially.Simultaneously, flexible partition wall can be effectively changes with the frequency change of main piston, guarantees the precision of regulating.

Description of drawings

Fig. 1 is the utility model first embodiment's a structural representation;

Fig. 2 is the utility model second embodiment's a structural representation.

Be described further below in conjunction with embodiment and accompanying drawing thereof.

Mode of execution

First embodiment:

Referring to Fig. 1, the pump housing 1 has a pump chamber 11 and an adjusting chamber 14, separate by a flexible partition wall 16 between the two, this example is a slice film, and a feed pathway mouth 12 and a liquid outlet channel mouth 13 are arranged in the pump chamber 11, and wherein liquid outlet channel mouth 13 is built-in with an one-way valve that is made of spool and spring, when being higher than the external world, opens the pressure in the pump chamber 11, otherwise close, this mouth is closed when piston 2 stops up feed pathway mouth 12, then opens when piston 2 leaves.Regulate also to be provided with a chamber in the chamber 14 and to hold preconditioning mechanism 3, its by limits 31, be positioned at the outer adjusting portion 33 in described adjusting chamber 14 and one connect qualification 31 and adjusting portion 33 and and the leading screw 32 of 1 screw-thread fit of the pump housing constitute.Regulate chamber 14 and also be provided with one and communicate, be used for the normal open walk 15 of exhaust with the external world, 16 of pump chamber 11 and flexible partition walls also are provided with a wall that has hole 17 in this example.This routine working principle is as follows, in the time of when piston 2 left lateral show left side, double dot dash line position to Fig. 1 after, be full of 12 liquid that enter in the pump chamber 11 from the passway, during piston 2 right laterals, flexible before this partition wall 16 pressurized right laterals are close to and are limited 31, the gas of regulating in the chamber 14 is discharged from often opening road junction 15 in this process, after flexible partition wall 16 puts in place, pump chamber 11 internal pressures will increase, and after pressure arrived the cracking pressure of liquid outlet channel 13 internal check valves, the liquid in the pump chamber 11 was discharged, return left after the piston arrives extreme right position, at this moment, the passway 12,13 all locate closed condition, are negative pressure state in the pump chamber 11, flexible partition wall 16 pressurized left lateral are close to the right side of 17 walls with holes, when piston ran to passage 12 and makes it to open, liquid entered pump chamber 11 from passage 12, enters next work cycle.Rotate adjusting portion 33 with hand, can make by the screw thread of 11 of the leading screw 32 and the pump housings to limit about 31 and advance, change the right lateral distance that limits flexible partition wall 16, thus the step-less adjustment of realization plunger pump discharge capacity.

Second embodiment:

It is comparatively simple to go up routine structure, but pump chamber 11 negative pressure are too high when having piston 2 left lateral, more problem consumes energy, for the long plunger pump of piston 2 strokes, can adopt the second following embodiment, referring to Fig. 2, what this example was different is, passway 12 is designed to a passway with reverse one-way valve, the energy consumption issues in the time of can avoiding piston stroke longer.

Above-mentioned two embodiments just are used for illustrating the special case of the present utility model design, are not to restriction of the present utility model, provide at the utility model under the prerequisite of design, can also carry out multiple variation easily.

Claims

1, the accurate adjustment plunger pump comprises

Pump housing with piston cavity, piston cavity are provided with two passwaies that are interlinked to the outside and selectively open and close with the pump housing;

It is characterized in that:

Also be provided with the adjusting chamber that is separated by a flexible partition wall between and piston cavity in the pump housing;

Regulating the chamber is provided with the pump housing is interlinked to the outside and often opens the road junction;

Regulate and also be provided with a chamber appearance preconditioning mechanism in the chamber.

2, accurate adjustment plunger pump according to claim 1 is characterized in that:

Described flexible partition wall is a film.

3, accurate adjustment plunger pump according to claim 1 and 2 is characterized in that:

Described chamber holds preconditioning mechanism and further comprises

A qualification head that limits described flexible partition wall to the one side shifting displacement of described adjusting chamber;

An adjusting portion that is positioned at outside the described adjusting chamber;

One connect to limit head and adjusting portion and and the described pump housing between the leading screw of screw-thread fit.