CN2721909Y

CN2721909Y - Plunger pump

Info

Publication number: CN2721909Y
Application number: CN 200420072244
Authority: CN
Inventors: 李伯卿
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-03
Filing date: 2004-08-03
Publication date: 2005-08-31
Anticipated expiration: 2014-08-03

Abstract

The utility model discloses a plunger pump, comprising a pump body with a pump cavity. The plunger is sealed and is positioned in slide in the pump cavity, the upper part of the pump body is provided with two one-way valves which are communicated with the inner side and outer side of the pump cavity and are arranged in reverse direction; a movable separating body which can make the pre-deliver medium and the plunger be isolated is arranged in the pump cavity between the plunger and the two one-way valves. The utility model has the advantages of small friction coefficient of the plunger and the pump cavity, and low manufacturing cost of the pump, and can prevent the leakage of the deliver medium.

Description

Plunger pump

Technical field

The utility model relates to a kind of plunger pump that is used for the conveyance fluid medium.

Background technique

The plunger pump that tradition is used for the conveyance fluid medium as shown in Figure 4, a pump housing 1 that has pump chamber 2 is arranged, can in pump chamber 2, do reciprocating linear motion under plunger 3 effect of power outside, one-

way valve

4,5 is staggered to open and close thereby make, and realization will be from the flowing medium of one-way valve 5 purpose from one-way valve 4 conveyings.

There is following several problem in the plunger pump of said structure, the one, flowing medium will contact with the sliding sealing surface of pump chamber 2 with plunger 3 and plunger 3, when the flowing medium of required conveying has than severe corrosive, shortened the working life of plunger pump greatly, perhaps, use the material plunger 3 and the pump chamber 2 of good corrosion resistance, but this there is the manufacture cost that has increased plunger pump.Usually, wishing has as far as possible little friction factor between plunger 3 and the pump chamber 2 under the prerequisite that satisfies sealing, to improve the efficient of plunger pump, and plunger 3 directly contacts with the medium of carrying, the lubricating grease that can make this place play sealing and lubrication runs off with increasing service time, and sealability descends and friction factor increases thereby be directed at.

Summary of the invention

The utility model main purpose provides a kind of little plunger pump of friction factor between good seal performance and plunger and pump chamber that has;

Another purpose of the utility model provides a kind of plunger pump that can prevent effectively that the hazardous medium carried from leaking;

A purpose more of the present utility model provides a kind of corrosion-resistant plunger pump of relative low price.

For achieving the above object, the plunger pump that the utility model provides comprises a pump housing that has pump chamber, plunger seal and being slidably located in the pump chamber, the pump housing is provided with and is communicated with inside and outside the pump chamber, reverse mutually two one-way valves that are provided with, in the pump chamber between plunger and two one-way valves, be provided with a movable spacer body that fed sheet of a media and plunger are isolated.

By above scheme as seen, owing to adopted movable spacer body with plunger and fed sheet of a media isolation, fed sheet of a media is sealed well, can not leak from plunger end, in addition, can between plunger and movable spacer body, be injected with the medium that helps lubricate, as lubricant oil, lubricating grease etc., thereby guarantee that plunger pump is in good low coefficient of friction state for a long time, simultaneously, the pump housing can be made from bearing's split of movable spacer body, that part of pump housing resistant material that only contacts with fed sheet of a media, thus reduced the manufacture cost of product relatively.

Description of drawings

Fig. 1 is the utility model first embodiment's a structure principle chart;

Fig. 2 is the utility model second embodiment's a structure principle chart;

Fig. 3 is the utility model the 3rd embodiment's a structure principle chart;

Fig. 4 is the structure principle chart of traditional plunger pump.

Mode of execution

First embodiment:

Referring to Fig. 1, a pump chamber 21,22 is arranged in the pump housing 1, plunger 3 can to-and-fro motion in pump chamber 21 under power drives.The other end of pump chamber 22 is provided with two one-

way valves

4,5, when one-way valve 5 is used for plunger 3 and shows right lateral by Fig. 1, will treat that fed sheet of a media sucks pump chamber 22, and this moment, one-way valve 4 was closed, and the fed sheet of a media that has pumped can not be returned to enter pump chamber 22; When one-way valve 4 is used for plunger 3 and shows left lateral by Fig. 1, will treat that fed sheet of a media sends pump chamber 22, this moment, one-way valve 5 was closed, and made the fed sheet of a media that enters pump chamber not withdraw from pump chamber 22 from one-way valve 5.And so forth, realize the conveying of medium.Between plunger 3 and two one-

way valves

4,5, a movable spacer body 6 is arranged, it is separated into not connected two ones with pump chamber, wherein pump chamber 21 constancy of volume in the running of pump, the medium of the inside can be air, lubricant oil or lubricating grease, the latter can be so that the friction factor between plunger and pump chamber remains lower, simultaneously, because the setting of movable spacer body 6, the different medium in two pump chambers 21,22 is effectively isolated.Divide the pump housing 1 to make by separated into two parts, its middle pump body 11 uses the precious materials of good corrosion resistance, and the pump housing 12 then can use low-cost common material to make.Movable spacer body 6 can use flexible materials such as oil resistant, corrosion-resistant reinforcement rubber to make, and periphery is folded into the fold of Accordion bellows-shaped, and end face can be a plane, leans on the separation of two pump chambers of flexible realization 21,22 of fold and the variation of pump chamber 22 volumes.

Second embodiment:

Referring to Fig. 2, there is identical label to represent identical implication among Fig. 2 with in the illustration 1, what this example was different with last example is a small plunger diameter pump, therefore, pump chamber 21 can be the pump chamber of a variable cross section, as long as in plunger 3 strokes is prismatic just passable, this example is specially adapted to plunger 3 strokes needs long use occasion.In addition, movable spacer body 6 is owing to be arranged on pump chamber 21,22 larger cross-section places, and the last example of its movable displacement is little, therefore, it can also be designed to elasticity oil resistant film preferably, plays the effect of movable slider equally.

The 3rd embodiment:

This example is an embodiment with the pump housing 1 complete split, the plunger 3 stroke district pump housings 13 are connected with the pump housing 12 by pipeline 7, thereby the pump chamber 21 of preceding two examples the pump chamber 21A and the 21B of mutual UNICOM, this general arrangement of equipment of the present utility model easy to use more under specific (special) requirements or special structural requirement have been divided into again.

Above-mentioned three 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, plunger pump comprises

The pump housing that has pump chamber;

Plunger seal and be positioned at pump chamber slidably;

The pump housing is provided with and is communicated with inside and outside the pump chamber, mutually two one-way valves that oppositely are provided with;

It is characterized in that:

In the pump chamber between plunger and two one-way valves, be provided with a movable spacer body that fed sheet of a media and plunger are isolated.

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

Described spacer body is a periphery and pump chamber sealing and fixing, and the middle part has flexible bag.

3, plunger pump according to claim 2 is characterized in that:

Described bag has telescopic fold limit portion and an end face.

4, plunger pump according to claim 1 is characterized in that:

Described spacer body is a periphery and pump chamber sealing and fixing, middle part rubber-like film.

5, according to each described plunger pump of claim 1 to 4, it is characterized in that:

The reciprocal Operational Zone of plunger is the pump chamber portion with iso-cross-section, and it links to each other by pipeline with another pump chamber portion of pump chamber.

6, plunger pump according to claim 5 is characterized in that:

The pump chamber portion of described iso-cross-section has the cross section little than another pump chamber portion.

7, plunger pump according to claim 6 is characterized in that:

Medium between described plunger and the movable spacer body in the pump chamber is an oil.