CN210904599U

CN210904599U - Medicine feeder with improved sealing and pushing-pulling force

Info

Publication number: CN210904599U
Application number: CN201920452686.6U
Authority: CN
Inventors: 施慧勇; 高原; 季岩福; 林良德
Original assignee: ZHEJIANG GONGDONG MEDICAL TECHNOLOGY CO LTD
Current assignee: ZHEJIANG GONGDONG MEDICAL TECHNOLOGY CO LTD
Priority date: 2019-04-04
Filing date: 2019-04-04
Publication date: 2020-07-03
Anticipated expiration: 2029-04-04

Abstract

The technical scheme of the utility model a sealed and drug delivery device after pulling force improves, including sleeve and core bar, the core bar front end is provided with the seal segment, sleeve front end medial surface is provided with the reaming section, the length of reaming section is greater than the length of seal segment, the reaming section realizes sealedly with seal segment interference fit. The utility model discloses novel structure makes the core bar reduce at the resistance that starts the stage through setting up the reaming section, and the person of facilitating the use is accurate easily operates, sets up a plurality of sealing rings simultaneously and seals, and the core bar also has a set of sealing ring to be in encapsulated situation at least pulling out the in-process slope for whole ware of dosing has fine sealed effect.

Description

Medicine feeder with improved sealing and pushing-pulling force

Technical Field

The present invention relates to a dispenser, and more particularly to a dispenser with improved sealing and pushing force.

Background

The administration device is a common appliance in the field of medicine, also called an injector, a syringe and the like, and has wide application. Some drug feeders in the market at present have a defect, most sleeves have a die drawing angle in the injection molding process, so that the inner diameter of the sleeve towards one side of a needle head is gradually reduced, and the resistance is increased when a core rod is pushed forwards; the inner diameter of a small part of the sleeve is basically unchanged along the axial direction, but in the initial stage of administration, the static friction force between the rubber plug and the sleeve is large, so the starting resistance is large, and the operation cannot be well controlled in the starting stage.

Disclosure of Invention

In order to solve the above problems, the present invention provides a dispenser with improved sealing and pushing force.

The technical scheme is that the medicine feeder with improved sealing and pulling force comprises a sleeve and a core rod, wherein a sealing section is arranged at the front end of the core rod, a hole expanding section is arranged on the inner side face of the front end of the sleeve, the length of the hole expanding section is larger than that of the sealing section, and the hole expanding section and the sealing section are in interference fit to realize sealing.

Preferably, the sealing section comprises at least two sealing rings arranged at intervals along the axial direction, and the sealing rings and the reaming section are in interference fit to realize sealing.

Preferably, the sealing ring is integrally injection molded with the core rod.

Preferably, the number of the sealing rings is three, the first sealing ring, the second sealing ring and the third sealing ring are arranged from front to back, and the outer diameter of the third sealing ring is larger than the outer diameters of the other two sealing rings.

Preferably, the thickness of the outer end of the sealing ring is gradually reduced from inside to outside along the radial direction.

Preferably, the reaming section and the inner wall of the sleeve at the rear end of the reaming section are in oblique smooth transition.

The invention has novel structure, the resistance of the core rod in the starting stage is reduced by arranging the reaming section, the operation is convenient for a user to operate accurately and easily, simultaneously, a plurality of sealing rings are arranged for sealing, at least one group of sealing rings are in a sealing state even if the core rod is inclined in the pushing and pulling process, so that the whole medicine feeder has good sealing effect, meanwhile, because the barrel body belongs to a thin-wall deep cavity structural member, the fault of sticking a mold cavity is easy to occur in the forming process, the arrangement of the reaming section can simultaneously start the movable mold core to stably bring back a product when the mold is opened, and the function of demoulding and dropping is enhanced when the movable mold core is ejected.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;

FIG. 3 is a front view of another aspect of the present invention;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 4 at C;

wherein: 1, a sleeve; 2-core bar; 3-a sealing section; 4-a reaming section; and 5, sealing rings.

Detailed Description

As shown in fig. 1 to 5, the invention provides a medicine feeder with improved sealing and pulling force, which comprises a sleeve 1 and a core rod 2, wherein a sealing section 3 is arranged at the front end of the core rod 2, a hole expanding section 4 is arranged on the inner side surface of the front end of the sleeve 1, the length of the hole expanding section 4 is greater than that of the sealing section 3, and the hole expanding section 4 and the sealing section 3 are in interference fit to realize sealing.

Preferably, the sealing section 3 comprises at least two sealing rings 5 arranged at intervals along the axial direction, the sealing rings 5 and the reaming section 4 are in interference fit to realize sealing, the thickness of the end head at the outer side of the sealing ring 5 is gradually reduced along the radial direction from inside to outside, so that the end head of the sealing ring 5 is easy to deform, in order to achieve a better sealing state, the sealing rings 5 are integrally injection-molded with the core rod 2, the number of the sealing rings 5 may be 2-4, preferably 3, and the three sealing rings respectively comprise a first sealing ring 51, a second sealing ring 52 and a third sealing ring 53 from front to back, the outer diameter of the third sealing ring 53 is larger than the outer diameters of the other two sealing rings, the sealing is mainly realized by the interference fit of the third sealing ring 53, and the existence of the first sealing ring 51 and the second sealing ring 52 can ensure that the core rod 2 is in a swing state during operation and still can effectively seal the inner side wall of the sleeve 1.

Preferably, the inner wall of the sleeve 1 at the rear end of the reaming section 4 is in oblique smooth transition, which can be fillet transition or bevel transition.

The invention has simple and novel structure, in the initial stage of administration, because of the existence of the reaming section 4, the static friction force between the sealing ring 5 and the reaming section 4 is smaller, the administration can be started smoothly under the initial state conveniently, in the normal pushing and pulling state, the sliding friction is formed between the sealing ring 5 and the side wall of the sleeve 1, the normal operation is not influenced, and the difficult problem that the static friction force is large and the operation is difficult in the starting state is solved smoothly. In addition, the sealing effect is ensured by arranging the sealing rings 5 at intervals, and even if the core rod 2 is inclined due to improper operation in the pushing and pulling process, at least one sealing ring 5 and the side wall of the sleeve 1 are in a sealing state, so that the sealing requirement is effectively ensured.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change or modification made to the above embodiments according to the technical principle of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. The utility model provides a sealed ware of dosing after pushing and pulling force improves, includes sleeve (1) and core bar (2), its characterized in that: the front end of the core rod (2) is provided with a sealing section (3), the inner side face of the front end of the sleeve (1) is provided with a hole expanding section (4), the length of the hole expanding section (4) is larger than that of the sealing section (3), and the hole expanding section (4) is in interference fit with the sealing section (3) to realize sealing.

2. The improved sealing and plunging force applicator of claim 1, wherein: the sealing section (3) comprises at least two sealing rings (5) which are arranged at intervals along the axial direction, and the sealing rings (5) and the reaming section (4) are in interference fit to realize sealing.

3. The improved sealing and plunging force applicator of claim 2, wherein: the sealing ring (5) and the core rod (2) are integrally formed by injection molding.

4. The improved sealing and plunging force applicator of claim 2, wherein: the number of the sealing rings (5) is three, the sealing rings are a first sealing ring (51), a second sealing ring (52) and a third sealing ring (53) from front to back, and the outer diameter of the third sealing ring (53) is larger than that of the other two sealing rings.

5. The improved sealing and plunging force applicator of claim 2, wherein: the thickness of the end head at the outer side of the sealing ring (5) is gradually reduced from inside to outside along the radial direction.

6. The improved sealing and plunging force applicator of claim 1, wherein: the inner wall of the sleeve (1) at the rear end of the reaming section (4) is in oblique smooth transition.