CN206409377U

CN206409377U - A kind of micro-piston pump

Info

Publication number: CN206409377U
Application number: CN201621437320.4U
Authority: CN
Inventors: 卢小平
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2017-08-15
Anticipated expiration: 2026-12-26

Abstract

A kind of micro-piston pump, it is related to liquid pump technical field, its structure includes cylinder body and piston, by setting the check valve that control liquid can only flow out in liquid outlet, and it is not provided with the control valve that any control liquid is flowed into inlet, so during piston bounces back, the closed check valve of liquid outlet, piston stops that inlet is connected with pump chamber always, and then to be in vacuum state in pump chamber, until when the head retraction of piston crosses inlet, feed liquor eloquence is connected with pump chamber, and now liquid is inhaled into pump chamber；During piston stretches out; piston stops the connection of inlet and pump chamber again; liquid in piston press pump chamber is so that the check valve of liquid outlet is pressurized and opened; so that the liquid in pump chamber is extruded; so complete the whole drawing liquid discharge opeing action of piston pump; this causes micro-piston pump of the present utility model in the case where inlet is without setting control valve, to be still able to ensure that the normal work of piston pump, and simplify the structure of piston pump.

Description

A kind of micro-piston pump

Technical field

The utility model is related to liquid pump technical field, and in particular to a kind of micro-piston pump.

Background technology

Piston pump is one kind of displacement pump, because piston pump is acted every time, and the volume change in its pumping cylinder is all identical, its Conveying fluid flow is directly proportional to the number of times that it is acted, so piston pump may be used as constant displacement pump, for requiring quantitative conveying liquid The occasion of body.

Piston pump is moved back and forth mainly by piston in pumping cylinder so that the swept volume generating period change of pumping cylinder, real Now suck and discharge liquid.Existing piston pump typically can all set check valve on feed tube and drain pipe, so in piston During pump work, when piston is moved backward, the closed check valve on drain pipe, the check valve on feed tube is opened, and liquid is from entering Liquid pipe flows into pumping cylinder, when piston advances forward, the closed check valve on feed tube, and the check valve on drain pipe is opened, fluid It is pumped out from pumping cylinder, then piston pump enters back into next working cycles.Because existing piston pump is in feed tube and goes out liquid It is required for setting check valve on pipe, this not only causes the structure of piston pump to tend to be complicated, it is most important that, for some feed tubes Or drain pipe or turnover liquid pipe are not easy to install the piston pump of check valve, existing piston pump can not realize normal work.

Outside, existing piston pump needs seal to work due to there is relative slip between piston and pumping cylinder Plug carries out dynamic sealing with pumping cylinder, but after piston pump long-time use, the sliding friction between piston and pumping cylinder will make Into the abrasion of seal, so that seal failure, causes the generation of leakage phenomenon.

The content of the invention

The purpose of this utility model is for the piston pump of the prior art for being not easy to install check valve, and provides one The micro-piston pump for simplifying structure is planted, the micro-piston pump ensures piston pump just in the case where reduction check valve uses number Often work.

The purpose of this utility model is achieved through the following technical solutions：

A kind of micro-piston pump, including cylinder body and piston are provided, piston is moved back and forth in cylinder body, cylinder body is provided with inlet The check valve that can only be flowed out provided with control liquid with liquid outlet, liquid outlet, during piston bounces back, the check valve of liquid outlet Close, piston stops that inlet is connected with being used to contain the pump chamber of liquid in cylinder body always, so as to vacuum state is in pump chamber, Until when the head retraction of piston crosses inlet, feed liquor eloquence is connected with pump chamber, and liquid is sucked into pump chamber；Stretched out in piston During, piston stops the liquid in the connection of inlet and pump chamber, piston press pump chamber again so that the check valve of liquid outlet It is pressurized and opens, so that the liquid in pump chamber is extruded.

Wherein, the cylinder body includes first paragraph cavity and the second segment cavity being connected with first paragraph cavity, first paragraph cavity Inwall and the outer wall of piston be brought into close contact, gap is provided between the inwall of second segment cavity and the outer wall of piston, liquid outlet is opened Located at first paragraph cavity, inlet is opened in second segment cavity.

Wherein, the cylinder body is provided with the seal for sealed cylinder block for the openend that piston is inserted.

Wherein, the seal is compressive seal, and the edge part of the seal seals the openend of the cylinder body, institute State piston rod axial restraint of the central part of seal with driving piston movement.

Wherein, the edge part of the seal seals the openend of the cylinder body, the central part and piston of the seal Connection.

Wherein, the seal is integrally formed with the piston, drives the piston rod of piston movement to pass through in seal Center portion is fixed with piston.

Wherein, one end that the piston is connected with the seal is less than the lock chamber of cavity volume bore provided with opening bore Body, piston is provided with the ailhead coordinated with fixed cavity, and ailhead is installed on into fixed cavity and realizes that the axial direction of piston rod and piston is consolidated It is fixed.

Wherein, the head of the piston is provided with the pyramidal structure with enlarging, and the inside of the pyramidal structure is provided with empty avoiding Position, so that the tapered wall of pyramidal structure can be to its internal modification.

Wherein, the edge of the tapered wall of the pyramidal structure is made up of soft material, when piston bounces back to the head of piston During close to inlet, the liquid for making inlet is extruded the tapered wall of pyramidal structure and makes its internal change by the pressure difference inside and outside pump chamber Shape, and then liquid crosses tapered wall and enters pump chamber.

The beneficial effects of the utility model：

Micro-piston pump of the present utility model, by simply setting the check valve that control liquid can only flow out in liquid outlet, And the control valve that any control liquid is flowed into is not provided with inlet, such as check valve so during piston bounces back, goes out The closed check valve of liquid mouthful, piston stops that inlet is connected with being used to contain the pump chamber of liquid in cylinder body always, and then causes pump Intracavitary is in vacuum state, until when the head retraction of piston crosses inlet, feed liquor eloquence is connected with pump chamber, now liquid quilt Suck pump chamber；During piston stretches out, piston stops the liquid in the connection of inlet and pump chamber, piston press pump chamber again Body is so to complete piston pump so that the liquid in pump chamber is extruded so that the check valve of liquid outlet is pressurized and opened Whole drawing liquid-discharge opeing action, this causes micro-piston pump of the present utility model in the case where inlet is without setting check valve, The normal work of piston pump is still able to ensure that, and simplifies the structure of piston pump.

Brief description of the drawings

Using accompanying drawing, the utility model is described in further detail, but the embodiment in accompanying drawing is not constituted to of the present utility model Any limitation, on the premise of not paying creative work, can also be according to following attached for one of ordinary skill in the art Figure obtains other accompanying drawings.

Fig. 1 is a kind of structural representation of micro-piston pump of the present utility model.

Include in Fig. 1：

1- cylinder bodies, 1A- inlets, 1B- liquid outlets, 1C- first paragraphs cavity, 1D- second segment cavitys；

2- pistons, 2A- pyramidal structures, 2B- clearance positions；

3- piston rods, 3A- ailheads；

4- drivers；

5- check valves；

6- contains sap cavity；

7- seals；

8- rear end caps.

Embodiment

The utility model is further described with the following Examples.

A kind of micro-piston pump of the present utility model, as shown in Figure 1（Micro-piston pump in Fig. 1 is vertical placement）, its Structure is included in cylinder body 1, piston 2, piston rod 3 and driver 4, the present embodiment, and driver 4 is electromagnet, certainly, according to reality Need can use other kinds of driver 4, driver 4 driving piston rod 3 move, and then piston rod 3 with piston 2 in cylinder body Pumped in 1, the left side of the lower end of cylinder body 1 is provided with inlet 1A, and inlet 1A is connected to contain the Sheng liquid of liquid Chamber 6, the right side of the upper end of cylinder body 1 is provided with liquid outlet 1B, and liquid outlet 1B is provided with the check valve 5 that control liquid can only flow out, unidirectionally Valve 5 is a kind of conventional miniature duckbill valve or other check valve forms.

As shown in figure 1, during piston 2 downwards retraction, liquid outlet 1B check valve 5 is closed, and piston 2 stops always Inlet 1A is connected with being used to contain the pump chamber of liquid in cylinder body 1, and vacuum state is now in pump chamber, until the head of piston 2 When portion's retraction crosses inlet 1A, inlet 1A is just connected with pump chamber, and liquid is sucked into pump chamber, and the imbibition for completing piston pump is moved Make；During piston 2 is protruded upward, piston 2 stops the connection of inlet 1A and pump chamber, the extrusion pump intracavitary of piston 2 again Liquid, and then liquid outlet 1B check valve 5 is opened because of compression, so that the liquid in pump chamber is extruded, completes to live The discharge opeing action of pump is filled in, the do action of whole drawing liquid-discharge opeing of piston pump is so completed, it is possible thereby to learn, this reality With new micro-piston pump control valve is not provided with inlet 1A（Such as check valve）In the case of, still it is able to ensure that piston The normal work of pump, but also the structure of piston pump can be simplified.

Further, cylinder body 1 includes first paragraph cavity 1C and the second segment cavity 1D being connected with first paragraph cavity 1C, first The outer wall of section cavity 1C inwall and piston 2 is brought into close contact, between being provided between second segment cavity 1D inwall and the outer wall of piston 2 Gap, liquid outlet 1B is opened in first paragraph cavity 1C, inlet 1A and is opened in second segment cavity 1D, the mistake bounced back downwards in piston 2 Cheng Zhong, when the head retraction of piston 2 crosses inlet 1A, first paragraph cavity 1C is fully located in pump chamber, and inlet 1A is inhaled Enter first paragraph cavity 1C and filled up；During piston 2 is protruded upward, piston 2 stops inlet 1A and pump chamber again Connection, and extrude the liquid in first paragraph cavity 1C so that liquid outlet 1B check valve 5 is opened because of compression, while second segment Gap between cavity 1D and piston 2 is filled with the liquid flowed into from inlet 1A, and during so as to next imbibition, liquid can be quick The whole second segment cavity 1D of filling.

In the present embodiment, as shown in figure 1, the seal 7 for being used for sealing the opening is provided with the lower ending opening that cylinder body 1 is supplied, Seal 7 is compressive seal, and the edge part of seal 7 seals the lower ending opening of cylinder body 1, specifically, the edge part of seal 7 Outside turnover groove in a ring, the lower ending opening of cylinder body 1 is stuck in annular groove, then by rear end cap 8 by the edge of seal 7 Portion is pressed on the lower ending opening of cylinder body 1, and the central part of seal 7 can be fixed with piston rod 3, whole piston 2 is sealed in In cylinder body 1, but in the present embodiment, the central part of seal 7 is connected with the lower end of piston 2, and seal 7 and piston 2 one Body formed, the central part and piston 2 of piston rod 3 through seal 7 are fixed in the axial direction of piston 2, are bounced back downwards in piston 2 During, the central part of seal 7 is moved downwardly together with piston 2, because seal 7 is compressive seal, and seal 7 Edge part be fixed, the other parts of such seal 7 also involving effect and deform downwards because of the central part of seal 7 Motion, same principle, during piston 2 is protruded upward, the other parts of seal 7 are also because of the central part of seal 7 Involve effect and upwardly-deformed motion, dynamic sealing is thus become into static sealing, not had between seal and moving component Have relative motion, so piston 2 reciprocating motion in will not abradable seal member 7, the service life of seal 7 can be extended, More importantly can effectively prevent because of the abrasion of seal 7 and caused by seal failure.

Further, to realize the direct affixed of piston rod 3 and piston 2, the lower surface of piston 2 is less than provided with opening bore The fixed cavity of cavity volume bore, piston 2 is provided with the ailhead 3A coordinated with the cavity volume of fixed cavity, and ailhead 3A is installed on into lock chamber In the cavity volume of body, and then realize being fixedly secured for piston rod 3 and piston 2.

In the present embodiment, as shown in figure 1, the upper head of piston 2 is provided with the pyramidal structure 2A with enlarging, the taper knot Structure 2A big opening end towards the upper end of cylinder body 1, pyramidal structure 2A osculum end towards the lower end of cylinder body 1, pyramidal structure 2A's Inside is provided with clearance position 2B, and the edge of pyramidal structure 2A tapered wall is softer, so when piston 2 retracts downwardly into the head of piston 2 When portion is close to inlet 1A, due to the effect of inside and outside differential pressure, inlet 1A liquid will extrude pyramidal structure 2A tapered wall simultaneously Make its internal modification, and then liquid crosses tapered wall and enters pump chamber.

Finally it should be noted that above example is only illustrating the technical solution of the utility model, rather than to this reality With the limitation of novel protected scope, although being explained with reference to preferred embodiment to the utility model, this area it is general Lead to it will be appreciated by the skilled person that can be modified to the technical solution of the utility model or equivalent substitution, without departing from this The spirit and scope of utility model technical scheme.

Claims

1. a kind of micro-piston pump, including cylinder body and piston, piston are moved back and forth in cylinder body, cylinder body is provided with inlet and goes out liquid Mouthful, the check valve that liquid outlet can only flow out provided with control liquid, it is characterised in that：During piston bounces back, liquid outlet Closed check valve, piston stops that inlet is connected with being used to contain the pump chamber of liquid in cylinder body always, so that in true in pump chamber Dummy status, until when the head retraction of piston crosses inlet, feed liquor eloquence is connected with pump chamber, and liquid is sucked into pump chamber；In work During plug stretches out, piston stops liquid in the connection of inlet and pump chamber, piston press pump chamber so that liquid outlet again Check valve be pressurized and open so that the liquid in pump chamber is extruded.

2. a kind of micro-piston pump according to claim 1, it is characterised in that：The cylinder body include first paragraph cavity and with The second segment cavity of first paragraph cavity connection, the inwall of first paragraph cavity and the outer wall of piston are brought into close contact, second segment cavity Gap is provided between inwall and the outer wall of piston, liquid outlet is opened in first paragraph cavity, and inlet is opened in second segment cavity.

3. a kind of micro-piston pump according to claim 1, it is characterised in that：The cylinder body supplies the openend that piston is inserted Provided with the seal for sealed cylinder block.

4. a kind of micro-piston pump according to claim 3, it is characterised in that：The seal is compressive seal, institute The edge part for stating seal seals the openend of the cylinder body, the central part of the seal and the piston rod for driving piston movement It is fixed.

5. a kind of micro-piston pump according to claim 3, it is characterised in that：The edge part of the seal seals described The openend of cylinder body, the central part of the seal is connected with piston.

6. a kind of micro-piston pump according to claim 5, it is characterised in that：The seal and the piston one into Type, drives the piston rod of piston movement through the central part and piston axial restraint of seal.

7. a kind of micro-piston pump according to claim 6, it is characterised in that：The piston is connected with the seal One end is less than the fixed cavity of cavity volume bore provided with opening bore, and piston rod is provided with the ailhead coordinated with fixed cavity, by ailhead It is installed on the axial restraint that fixed cavity realizes piston rod and piston.

8. a kind of micro-piston pump according to claim 7, it is characterised in that：Also include the electromagnetism of driving piston rod movement Driver.

9. a kind of micro-piston pump according to claim 1, it is characterised in that：The head of the piston, which is provided with, has enlarging Pyramidal structure, the inside of the pyramidal structure is provided with clearance position, so that the tapered wall of pyramidal structure can be to its internal modification.

10. a kind of micro-piston pump according to claim 9, it is characterised in that：The side of the tapered wall of the pyramidal structure Cause soft material is made, when piston bounces back to the head of piston close to inlet, and the pressure difference inside and outside pump chamber will make inlet Liquid extruding pyramidal structure tapered wall and make its internal modification, and then liquid crosses tapered wall and enters pump chamber.