Push rod sealing structure of needleless injector

Abstract

The utility model discloses a push rod sealing structure of a needleless injector. The push rod sealing structure comprises a liquid storage tank, a Y-shaped sealing ring, a guide ring base, a guide ring, a push rod and a static O-shaped sealing ring. The Y-shaped sealing ring is fixed on the inner wall of the liquid storage tank, the guide ring base is fixed on a liquid storage cavity of the liquid storage tank, the guide ring is fixed in the guide ring base, the push rod reciprocates on the inner side of the Y-shaped sealing ring and the inner side of the guide ring, and the static O-shaped sealing ring is mounted in a groove of the guide ring fixing seat and is sealed with the liquid storage tank. The Y-shaped sealing ring used in the structure is made of polyurethane, so that the wear resistance is superior to that of an O-shaped ring; the outer surface of the push rod and the inner side of the Y-shaped sealing ring are sealed, the smoothness of the outer surface of the push rod needs to meet the requirement, compared with the inner surface of the liquid storage tank, the outer surface is easier to machine, and cost is saved; according to the structure, the guide ring is tightly attached to the Y-shaped ring, and the guide ring fixing seat and the liquid storage cavity are also sealed, so that the whole structure is subjected to secondary sealing, and the sealing effect is better.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a push rod sealing structure for a needleless injector. Background Technology

[0002] A needle-free injector is a veterinary medical device. Needle-free injection uses the instantaneous high pressure generated by the power source to propel the liquid in the reservoir through the nozzle into a high-speed, high-pressure jet, allowing the drug to penetrate the skin surface. If the liquid is not sealed tightly, it will affect the use of the entire device. Currently, the most common sealing method for the plunger is to fix an O-ring in the groove of the plunger, with the inner wall of the reservoir tightly fitted to the O-ring for sealing. This sealing method requires the surface roughness of the inner wall of the reservoir to meet certain requirements, which is difficult to process. Furthermore, the O-ring is generally made of nitrile rubber, which is easily damaged during the high-speed reciprocating motion of the plunger.

[0003] The purpose of this invention is to provide a sealing structure with better sealing performance and easier processing. Utility Model Content

[0004] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides a push rod sealing structure for a needleless injector.

[0005] This invention is implemented by constructing a push rod sealing structure for a needle-free injector, characterized in that: the sealing structure includes a liquid storage tank, a Y-shaped sealing ring, a guide ring base, a guide ring, a push rod, and a static O-ring; the Y-shaped sealing ring is fixed to the inner wall of the liquid storage tank, the guide ring base is fixed to the liquid storage cavity of the liquid storage tank, the guide ring is fixed inside the guide ring base, the push rod reciprocates between the inner side of the Y-shaped sealing ring and the inner side of the guide ring, and the static O-ring is installed in the groove of the guide ring fixing seat to seal with the liquid storage tank.

[0006] According to the present invention, a push rod sealing structure for a needleless injector is provided; the Y-type sealing ring used in this structure is made of polyurethane, which has better wear resistance than O-rings.

[0007] According to the present invention, a push rod sealing structure for a needleless injector is provided. This structure seals the outer surface of the push rod with the inner side of the Y-shaped sealing ring. The smoothness of the outer surface of the push rod must meet the requirements. Compared with the inner surface of the liquid storage tank, the outer surface is easier to process and saves costs.

[0008] According to the present invention, a push rod sealing structure for a needleless injector is provided; the guide ring and the Y-shaped sealing ring are tightly fitted together, and the guide ring base and the liquid storage tank are also sealed, thereby achieving a secondary seal for the entire structure and improving the sealing effect.

[0009] This invention has the following advantages: Compared with ordinary sealing methods, the Y-shaped sealing ring used in this structure is made of polyurethane, which has better wear resistance than O-rings; the outer surface of the push rod is sealed to the inner side of the Y-shaped sealing ring, and the surface finish of the outer surface of the push rod must meet the requirements. Compared with the inner surface of the liquid storage tank, the outer surface is easier to process, saving costs; the guide ring and the Y-shaped ring are tightly fitted, and the guide ring fixing seat and the liquid storage cavity are also sealed, thus the entire structure is sealed twice, resulting in a better sealing effect. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating the implementation of the push rod sealing structure of this application.

[0011] The components include: liquid storage tank 1, Y-type sealing ring 2, guide ring base 3, guide ring 4, push rod 5, and static O-ring sealing ring 6. Detailed Implementation

[0012] The following will be combined with the appendix Figure 1 This utility model will be described in detail, and the technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0013] This utility model provides an improved plunger sealing structure for a needleless injector, such as... Figure 1 As shown, it can be implemented as follows: The sealing structure includes a liquid storage tank 1, a Y-shaped sealing ring 2, a guide ring base 3, a guide ring 4, a push rod 5, and a static O-ring 6; the Y-shaped sealing ring 2 is fixed to the inner wall of the liquid storage tank 1, the guide ring base 3 is fixed to the liquid storage cavity of the liquid storage tank 1, the guide ring 4 is fixed inside the guide ring base 3, the push rod 5 reciprocates between the inner side of the Y-shaped sealing ring 2 and the inner side of the guide ring 4, and the static O-ring 6 is installed in the groove of the guide ring fixing seat to seal with the liquid storage tank 1.

[0014] In the plunger sealing structure of the needleless injector described in this application, the Y-type sealing ring 2 used in this structure is made of polyurethane, which has better wear resistance than the O-ring.

[0015] In the push rod sealing structure of the needleless injector described in this application, the outer surface of the push rod 5 is sealed with the inner side of the Y-shaped sealing ring 2. The surface finish of the outer surface of the push rod 5 must meet the requirements. Compared with the inner surface of the liquid reservoir, the outer surface is easier to process and saves costs.

[0016] In the push rod sealing structure of the needleless injector described in this application, the guide ring 4 is tightly fitted with the Y-shaped sealing ring 2, and the guide ring base and the liquid storage tank are also sealed, thereby achieving a secondary seal for the entire structure and improving the sealing effect.

[0017] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plunger sealing structure for a needleless injector, characterized in that; The sealing structure includes a liquid storage tank (1), a Y-shaped sealing ring (2), a guide ring base (3), a guide ring (4), a push rod (5), and a static O-ring (6). The Y-shaped sealing ring (2) is fixed to the inner wall of the liquid storage tank (1), the guide ring base (3) is fixed to the liquid storage cavity of the liquid storage tank (1), the guide ring (4) is fixed inside the guide ring base (3), the push rod (5) reciprocates between the inner side of the Y-shaped sealing ring (2) and the inner side of the guide ring (4), and the static O-ring (6) is installed in the groove of the guide ring fixing seat to seal with the liquid storage tank (1).

2. The plunger sealing structure of a needleless injector according to claim 1, characterized in that; The Y-type sealing ring (2) used in this structure is made of polyurethane, which has better wear resistance than the O-ring.

3. The plunger sealing structure of a needleless injector according to claim 1, characterized in that; This structure seals the outer surface of the push rod (5) with the inner side of the Y-shaped sealing ring (2). The smoothness of the outer surface of the push rod (5) must meet the requirements. Compared with the inner surface of the liquid storage tank, the outer surface is easier to process.

4. The plunger sealing structure of a needleless injector according to claim 1, characterized in that; In this structure, the guide ring (4) is tightly fitted with the Y-shaped sealing ring (2), and the guide ring base (3) is sealed with the liquid storage tank (1), thereby achieving a secondary seal for the entire structure.

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