CN207960918U - A kind of elastic piston, high-pressure pumping system - Google Patents
A kind of elastic piston, high-pressure pumping system Download PDFInfo
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- CN207960918U CN207960918U CN201820254401.3U CN201820254401U CN207960918U CN 207960918 U CN207960918 U CN 207960918U CN 201820254401 U CN201820254401 U CN 201820254401U CN 207960918 U CN207960918 U CN 207960918U
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- piston
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- skew wall
- side skew
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Abstract
The utility model discloses a kind of elastic pistons, high-pressure pumping system, elastic piston includes piston only, on front side of the circumferential side wall of piston only and rear side is respectively formed front side skew wall and rear side skew wall, sunk area is constituted with the circumferential side wall in piston only, there is the first angle between front side skew wall and rear side skew wall, there is the second angle between front side skew wall and the central axis of piston only, the maximum gauge of front side skew wall is more than the diameter of piston cavity wall, the utility model elastic piston, the end of front side skew wall, which with piston cavity wall forms elasticity, to be supported and contacts, to form effective sealing in pistons front sides；Meanwhile the setting of sunk area is but also front side skew wall has the elastomeric radial amount of bigger so that the end of front side skew wall fits closely with piston cavity wall composition and contacts.Compared with traditional cylindrical piston, the design of the front side skew wall and rear side skew wall of the utility model piston reduces the requirement to piston machining accuracy.
Description
Technical field
The present invention relates to medical equipment technical field, more particularly to a kind of elastic piston, high-pressure pumping system.
Background technology
In the medical high-pressure pumping system of the prior art, piston is usually cylindrical piston, and piston receiver is simultaneously slidably connected
In piston cavity wall, piston reciprocating is moved to be supplied to power, and fluid is made to be pumped into and leave pump chamber.Since piston is cylinder
Shape piston has the machining accuracy of piston very high to ensure there is good sealing property between piston and piston cavity wall
It is required that, it is necessary to assure outer diameter, cylindricity and the concentricity of piston, which meet pre-provisioning request, could realize that excellent sealing, piston add
Work difficulty is big, and manufacturing cost is very high.
Enter air in pressure duct and form bubble, since air has prodigious compressibility in a high voltage state, together
When air be gathered in around pump housing inlet valve or outlet valve, the keying characteristic of inlet valve or outlet valve will be seriously affected, caused
High pressure water flow forms pipeline weakest part the pressure characteristic for impacting, and then changing entire pressure duct, easily forms pipeline very
Rupture and damage.How existing piston avoids gas from entering and lacks solution party in pressure duct in pumping system aspiration procedure
Method.
In addition, in existing medical pumping system, in order to reduce Piston Machining difficulty, piston also has using rigid post beyond the Great Wall
Wall is embedded in the structure type of O-ring seal, this kind of structure type, and sealing performance is carried out only by the elasticity of O-ring seal
Sealing, sealing effect are bad；Moreover, complicated, there are sealing dead spaces, it is difficult to reach sterilizing and require.
Invention content
Technical problem to be solved by the invention is to provide the low elastic piston of a kind of good seal performance, difficulty of processing, tools
There is the high-pressure pumping system of the elastic piston.
Used technical solution to solve above-mentioned technical problem：A kind of elastic piston, including piston only, the piston
On front side of the circumferential side wall of ontology and rear side is respectively formed front side skew wall and rear side skew wall, in the middle part of the circumferential side wall of piston only
Sunk area is constituted at region, and there is the first angle, the front side skew wall and piston between the front side skew wall and rear side skew wall
There is the second angle, the maximum gauge of the front side skew wall to be more than the diameter of piston cavity wall between the central axis of ontology.
Preferably, the front side end wall of the piston only is recessed pressure chamber, the circumferential side wall of the pressure chamber
With chamber skew wall.
Preferably, the chamber skew wall is identical as the inclined direction of front side skew wall.
Preferably, rear side skew wall end, which outwardly protrudes extension, has protrusion, and the maximum gauge of the protrusion, which is more than, lives
Fill in the diameter of cavity wall.
Preferably, the protrusion is triangle protrusion, and the rear side end wall of the piston only extends radially outwardly as triangle
The side wall of protrusion.
Preferably, the angle of first angle is more than 60 ° and is less than 180 °, the angle of second angle be more than 5 ° and
Less than 90 °.
Preferably, the chamber skew wall is more than 0.1mm with the walled thickness that front side skew wall is constituted.
Preferably, the width of the triangle protrusion is more than 0.01mm.
Used technical solution to solve above-mentioned technical problem：A kind of high-pressure pumping system, including above-mentioned yielding movable
Plug, the elastic piston elasticity are received in piston cavity wall and can be moved back and forth in piston cavity wall.
Advantageous effect：This elastic piston, the structure type of the straight circumferential side wall of abandoning tradition cylindrical piston, circumference
The front side of wall and rear side respectively constitute front side skew wall and rear side skew wall, and front side skew wall end, which with piston cavity wall forms elasticity, to be supported and connect
It touches, to form effective sealing in pistons front sides；Meanwhile the setting of sunk area is but also front side skew wall has the elasticity of bigger
Deflection so that front side skew wall end fits closely with piston cavity wall composition and contacts.
Elastic piston is in piston cavity wall, and the projection diameter on rear side skew wall is more than the diameter of piston cavity wall, and protrusion exists
It is close to the deformation of piston cavity wall, when elastic piston pull is moved forward and backward, pump housing plunger shaft volume under the squeezing action of piston cavity wall
It is continuous to increase and reduce, when plunger shaft increases, Negative Pressure Difference, effect of the flow in Negative Pressure Difference are formed outside the internal and pump housing
It is lower to enter plunger shaft, since the protrusion on rear side skew wall is close to piston cavity wall, between being not present between elastic piston and piston cavity wall
Gap, air, which cannot be introduced into, is mixed into liquid internal in plunger shaft.
Compared with traditional cylindrical piston, the design of the front side skew wall and rear side skew wall of inventive piston reduces pair
The requirement of piston machining accuracy reduces manufacturing cost.
Description of the drawings
The present invention is described further with reference to the accompanying drawings and examples；
Fig. 1 is the cross-sectional view of elastic piston in the embodiment of the present invention；
Fig. 2 is the part section structural representation of elastic piston in the embodiment of the present invention；
Fig. 3 is the part section structural representation of elastic piston in another embodiment of the present invention；
Fig. 4 is the part section structural representation of elastic piston and piston cavity wall Elastic Contact in the embodiment of the present invention.
Specific implementation mode
Referring to figs. 1 to Fig. 4, elastic piston of the present invention, including piston only, the circumferential side wall front side of piston only and rear side
It is respectively formed front side skew wall 11 and rear side skew wall 12, it is preferable that front side skew wall 11 is directly intersected with rear side skew wall 12, certainly, preceding
It can also be also connected by connection wall between skew back wall 11 and rear side skew wall 12, due to setting for front side skew wall 11 and rear side skew wall 12
It sets, when the circumferential side wall central region of piston only can constitute sunk area 13, and piston only is received in piston cavity wall,
The central region of piston only is not formed with piston cavity wall and is contacted.There is the first folder between front side skew wall 11 and rear side skew wall 12
Angle C, it is preferable that the angle of the first angle C is more than 60 ° and is less than 180 °.Certainly, between current skew back wall 11 and rear side skew wall 12
When being connected by other connection walls, front side skew wall 11 to rear side skew wall 12 has multiple angles；Front side skew wall 12 and piston only
Central axis between have the second angle G, it is preferable that the angle of the second angle G be more than 5 ° and be less than 90 °.
Wherein, the maximum gauge of front side skew wall 11 is more than the diameter of piston cavity wall, and maximum gauge refers to front side skew wall 11
End diameter on front side of towards piston only, to which piston only is received in piston cavity wall, 11 energy of front side skew wall and piston
The wall surface of cavity wall forms elasticity and supports contact, to form effectively sealing.Preferably, 12 end of rear side skew wall outwardly protrudes extension
With protrusion 14, the maximum gauge of protrusion 14 is more than the diameter of piston cavity wall, to which piston only is received in piston cavity wall,
Protrusion 14 on rear side skew wall 12 can form elasticity with the wall surface of piston cavity wall to be supported and contacts, to form effectively sealing.In this way,
On front side of piston only and rear side can form effective sealed connection.
Compared with traditional cylindrical piston, cylindrical piston and the unison of piston cavity wall, cylindricity and diameter dimension etc.
Excellent sealing between piston and piston cavity wall could be realized by needing to meet pre-provisioning request, all to the requirement on machining accuracy of two parts
It is very high, however, in actual production manufacturing process, due to the presence of mismachining tolerance so that cylindrical piston and piston cavity wall
Between have that contact fitting is bad, and especially, on front side of cylindrical piston or rear end fails to contact with piston cavity wall, cause or
Piston seal is bad.
The elastic piston of the present invention realizes that excellent sealing mainly passes through the protrusion 14 of front side skew wall 11 and rear side skew wall 12
Elasticity supports fitting piston cavity wall, and the requirement to machining accuracy is low, moreover, the presence of sunk area 13 so that front side skew wall 11
Can have the elastic deformation amount of bigger in radial directions with rear side skew wall 12, it is easier to fit closely with piston cavity wall composition
Contact.In addition, the front side skew wall 11 of piston only and the protrusion 14 of rear side skew wall 12 are supported with piston cavity wall elasticity when contacting, also
Centering guiding role can be played so that the central axis of piston only and the axis of piston cavity wall are automatically aligned to.
Wherein, the shape of protrusion 14 can be triangle, quadrangle, semicircle or ellipse etc., and the width B of protrusion 14 is not
It can all cover and occupy rear side skew wall 12, the width B of protrusion 14 need to be more than 0.01mm.Preferably, protrusion 14 is triangle protrusion, living
The side wall that the rear side sidewall of plug ontology extends outwardly as triangle protrusion, the skew wall of triangle protrusion and the rear side end wall of piston only
Between there is third included angle A, the angle of third included angle A is more than 15 ° and is less than 75 °, and the setting of protrusion 14 also ensures piston sheet
Air-tightness in body reciprocating movement, specifically, when piston only pull moves, piston cavity can form negative pressure, due to convex
It plays 14 continuous elastics to support and be covered in piston cavity wall, forms blocking, air is avoided to be mixed into the fluid of piston cavity, improve the pump housing
Operation stability, extend the service life of the pump housing, reduce the risk to break down using process.
The front side end wall indent of piston only also forms pressure chamber 15, and pressure chamber 15 is in bowl-type, and pressure chamber 15 has
There is chamber skew wall 16, when piston only pressurization is mobile, it is oblique that the high-pressure fluid in pressure chamber 15 radially outward presses to chamber
Wall 16 so that front side skew wall 11 forms even closer fitting with piston cavity wall and contacts, i.e. high-pressure fluid actuating pressure is bigger, front side
The sealing performance that skew wall 11 plays is better.Preferably, chamber skew wall 16 is identical as 11 inclined direction of front side skew wall, inclined direction phase
It is parallel with front side skew wall 11 with chamber skew wall 16 is not limited to, and chamber skew wall 16 can also be to be made of multistage, chamber is oblique
Wall 16 is more than 0.1mm with the walled thickness H that front side skew wall 11 is constituted.
The medical high-pressure pumping system of the present invention, including above-mentioned elastic piston, elastic piston elasticity, which is received, is in plunger shaft
Wall can in an axial direction move back and forth under the action of dynamical system in piston cavity wall.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned embodiment party
Formula, the technical field those of ordinary skill within the scope of knowledge, can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (9)
1. a kind of elastic piston, it is characterised in that：Including piston only, divide with rear side on front side of the circumferential side wall of the piston only
Not Xing Cheng front side skew wall and rear side skew wall, to be constituted sunk area at the circumferential side wall central region of piston only, before described
There is the first angle between skew back wall and rear side skew wall, have second between the front side skew wall and the central axis of piston only
Angle, the maximum gauge of the front side skew wall are more than the diameter of piston cavity wall.
2. elastic piston according to claim 1, it is characterised in that：The front side end wall of the piston only is recessed pressure
The circumferential side wall of power chamber, the pressure chamber has chamber skew wall.
3. elastic piston according to claim 2, it is characterised in that：The inclined direction of the chamber skew wall and front side skew wall
It is identical.
4. elastic piston according to claim 1 or 2, it is characterised in that：Rear side skew wall end outwardly protrudes extension
With protrusion, the maximum gauge of the protrusion is more than the diameter of piston cavity wall.
5. elastic piston according to claim 4, it is characterised in that：The protrusion is triangle protrusion, the piston only
The side wall that extends radially outwardly as triangle protrusion of rear side end wall.
6. elastic piston according to claim 1, it is characterised in that：The angle of first angle is more than 60 ° and is less than
180 °, the angle of second angle is more than 5 ° and is less than 90 °.
7. elastic piston according to claim 3, it is characterised in that：The thin-walled that the chamber skew wall is constituted with front side skew wall
Thickness is more than 0.1mm.
8. elastic piston according to claim 5, it is characterised in that：The width of the triangle protrusion is more than 0.01mm.
9. a kind of high-pressure pumping system, it is characterised in that：It is described including the elastic piston described in claim 1-8 any one
Elastic piston elasticity is received in piston cavity wall and can be moved back and forth in piston cavity wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820254401.3U CN207960918U (en) | 2018-02-12 | 2018-02-12 | A kind of elastic piston, high-pressure pumping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820254401.3U CN207960918U (en) | 2018-02-12 | 2018-02-12 | A kind of elastic piston, high-pressure pumping system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207960918U true CN207960918U (en) | 2018-10-12 |
Family
ID=63739217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820254401.3U Withdrawn - After Issue CN207960918U (en) | 2018-02-12 | 2018-02-12 | A kind of elastic piston, high-pressure pumping system |
Country Status (1)
| Country | Link |
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| CN (1) | CN207960918U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302032A (en) * | 2018-02-12 | 2018-07-20 | 惠州海卓科赛医疗有限公司 | A kind of elastic piston, high-pressure pumping system and method |
-
2018
- 2018-02-12 CN CN201820254401.3U patent/CN207960918U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302032A (en) * | 2018-02-12 | 2018-07-20 | 惠州海卓科赛医疗有限公司 | A kind of elastic piston, high-pressure pumping system and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20200207 |
|
| AV01 | Patent right actively abandoned |