CN208785475U - Lower resistance exempts from leakage piston - Google Patents

Abstract

The utility model relates to lower resistances to exempt from leakage piston, including piston only, the piston only is ring type seal, the front end face of sealing ring is equipped with along its circumferential annular groove, rear end face is equipped with the convex annular looping outwardly protruded, and the distance between convex annular looping and sealing ring inner wall are 0.05-0.1mm, and the outer wall of the sealing ring is equipped with annular shirt rim, the front end face of the annular shirt rim and sealing ring is flush, and the inner wall of sealing ring is equipped with the annular stop circle outwardly protruded.The utility model has the characteristics that lower resistance, high leakproofness.

Description

Lower resistance exempts from leakage piston

Technical field

The utility model relates to syringe piston technical field, in particular to a kind of lower resistance exempts from leakage piston.

Background technique

Syringe is a kind of common medical instrument.Usual syringe includes housing and piston push rod.For ensure piston with The leakproofness of housing, between the sealing ring and outer casing inner wall of conventional syringe piston use tight slightly interference fit, cause using Push-and-pull syringe core rod resistance is big in the process, considerably increases the working strength of medical worker.

Summary of the invention

In view of the above problems, the object of the present invention is to provide be completely embedded between a kind of piston and housing but resistance compared with Small, the lower resistance that can reduce medical worker's working strength exempts from leakage piston.

The technical scheme for implementing the utility model is as follows:

Lower resistance exempts from leakage piston, including piston only, and the piston only is ring type seal, the front end face of sealing ring Equipped with along its circumferential annular groove, rear end face is equipped with the convex annular looping outwardly protruded, convex annular looping and sealing ring inner wall it Between distance be 0.05-0.1mm, the outer wall of the sealing ring is equipped with annular shirt rim, the front end of the annular shirt rim and sealing ring Face is flush, and the inner wall of sealing ring is equipped with the annular stop circle outwardly protruded.

Further, the section of the annular groove is v-shaped structure, and the upper surface of annular groove is parallel with horizontal line.

Further, the sealing ring is made of elastic material.

Above-mentioned scheme is employed, in use, resistance greatly reduces, can be operated in this way with the promotion piston of very comfortable Syringe very easily, while the phenomenon that also ensure the leakproofness between piston and housing, avoid leakage will guarantee note Emitter is reliable and stable, and use is safe；And the structure of piston is simplified, and can not only reduce production cost, but also can be with Improve production efficiency.

Detailed description of the invention

FIG. 1 is a schematic structural view of the utility model；

Fig. 2 is the right view of Fig. 1.

Specific embodiment

The present invention will be further described in the following with reference to the drawings and specific embodiments.

Such as Fig. 1 and Fig. 2, lower resistance exempts from leakage piston, including piston only 1, and the piston only is ring type seal, note Emitter push rod is mounted in the through-hole of sealing ring, and sealing ring is made of rubber, and the front end face of sealing ring is equipped with along its circumferential ring The section of shape slot 2, annular groove is v-shaped structure, and the upper surface of annular groove is parallel with horizontal line, the folder of the annular groove of v-shaped structure Angle α is 30 °, by the annular groove, when extruding in housing pressure increase and squeeze annular groove, i.e., pressure increases annular groove contracting Small, pressure reduces annular groove and replys, and does not interfere with the resistance between piston and housing thus, reduces the friction between them Power, to achieve the purpose that lower resistance, high leakproofness, the outer wall of sealing ring is equipped with annular shirt rim 3, the annular shirt rim and sealing The front end face of circle is flush, in this way the leakproofness between guarantee sealing ring and housing, prevents leakage, use is safe, sealing ring Rear end face is equipped with the convex annular looping 4 that outwardly protrudes, the distance between convex annular looping and sealing ring inner wall for 0.05mm or 0.07mm or 0.1mm, the inner wall of sealing ring are equipped with the annular stop circle 5 outwardly protruded, and protrusion circle and spacing collar are used to connect It is compact to guarantee that push rod is connected firmly with piston for injector push-rod.

Claims (3)

1. lower resistance exempts from leakage piston, it is characterised in that: including piston only, the piston only is ring type seal, sealing The front end face of circle is equipped with along its circumferential annular groove, and rear end face is equipped with the convex annular looping outwardly protruded, convex annular looping with it is close The distance between seal inner wall is 0.05-0.1mm, and the outer wall of the sealing ring is equipped with annular shirt rim, the annular shirt rim with it is close The front end face of seal is flush, and the inner wall of sealing ring is equipped with the annular stop circle outwardly protruded.

2. lower resistance according to claim 1 exempts from leakage piston, it is characterised in that: the section of the annular groove is V-arrangement knot The upper surface of structure, annular groove is parallel with horizontal line.

3. lower resistance according to claim 1 exempts from leakage piston, it is characterised in that: the sealing ring is by elastic material system At.