Piston with high sealing performance

Abstract

The utility model belongs to the technical field of pistons, and particularly relates to a high-sealing-performance piston which comprises a piston core, two sets of first mounting grooves and two sets of second mounting grooves are formed in the outer surface of the piston core, and a first sealing assembly and a second sealing assembly are installed in the two sets of first mounting grooves respectively. A first elastic assembly and a second elastic assembly are mounted in the two second mounting grooves correspondingly, elastic supplement can be conducted when the sealing assembly is sealed through cooperation of the sealing assembly and the elastic assemblies, the sealing performance of the piston is improved, and the piston is of a double-layer sealing structure and has the high sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of pistons, in particular to a high-sealing piston. Background Art

[0002] The syringe piston is an important component in the syringe. Currently, most medical syringe pistons are made of vulcanized natural rubber or butyl rubber. During the design, a variety of chemical elements are generally added to the piston to improve the performance. During the use of the rubber piston, the rubber outer diameter and the outer surface of the bottom are in direct contact with the drug in the syringe. Therefore, there is a risk of chemical reaction between the chemical components inside the rubber piston and the drug.

[0003] In order to ensure sealing, existing syringes are all equipped with a sealing ring fixed at the front end of the push rod. There is a very large friction resistance between the sealing ring and the inner wall of the syringe, which requires the operator to use a lot of force to push the push rod. Although some syringes currently use a technology that causes the sealing ring to deform during the process of pushing the push rod, thereby reducing the resistance between the sealing ring and the inner wall of the syringe, the front end surface of the sealing ring of this syringe has a very small contact area with the sealing ring support component, resulting in the sealing of the sealing ring cannot be guaranteed during the deformation process, thereby reducing the sealing reliability. For this reason, we propose a high-sealing piston. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a high-sealing piston. The sealing component cooperates with the elastic component to supplement the elasticity of the sealing component when sealing, thereby improving the sealing performance of the piston. The piston has a double-layer sealing structure and has a high sealing performance, thus solving the background problem.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A high-sealing piston comprises a plug core, wherein the outer surface of the plug core is provided with two groups of first mounting grooves and two groups of second mounting grooves, a first sealing component and a second sealing component are respectively installed inside the two groups of the first mounting grooves, and a first elastic component and a second elastic component are respectively installed inside the two groups of the second mounting grooves.

[0007] Preferably, the first sealing assembly and the second sealing assembly both include a first annular mounting portion, the outer surface of the first annular mounting portion is integrally connected with a conical sealing portion, and the conical sealing portion is integrally connected with a lip edge portion.

[0008] Preferably, the first elastic component and the second elastic component both include a second annular mounting portion, and an elastic abutting portion is integrally connected to the second annular mounting portion.

[0009] Preferably, the elastic abutting portion is in tight abutment with the conical sealing portion.

[0010] Preferably, a mounting cavity is provided on the plug core.

[0011] Preferably, the front end of the plug core is a conical structure. Beneficial Effects

[0012] The utility model provides a high-sealing piston. Compared with the prior art, it has the following beneficial effects:

[0013] 1. This high-sealing piston can supplement the elasticity of the sealing component when it is sealed by cooperating with the sealing component and the elastic component, so as to improve the sealing performance of the piston. The piston has a double-layer sealing structure and has a high sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the main body split structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the main body of the utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the plug core of the utility model;

[0018] Figure 5 It is a schematic diagram of the structure of the first sealing component and the first elastic component of the utility model.

[0019] In the figure: 1. plug core; 2. first sealing component; 3. second sealing component; 4. mounting cavity; 5. first elastic component; 6. second elastic component; 7. first mounting groove; 8. second mounting groove; 9. first annular mounting portion; 10. conical sealing portion; 11. lip portion; 12. elastic abutment portion; 13. second annular mounting portion. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-5The utility model provides a technical solution: a high-sealing piston, including a plug core 1, the outer surface of the plug core 1 is provided with two groups of first mounting grooves 7 and two groups of second mounting grooves 8, the inside of the two groups of first mounting grooves 7 are respectively installed with a first sealing component 2 and a second sealing component 3, and the inside of the two groups of second mounting grooves 8 are respectively installed with a first elastic component 5 and a second elastic component 6.

[0022] The piston can supplement the elasticity of the sealing component when sealing through the cooperation of the sealing component and the elastic component, so as to improve the sealing performance of the piston. The piston has a double-layer sealing structure and has a high sealing performance.

[0023] The first sealing component 2 and the second sealing component both include a first annular mounting portion 9, the outer surface of the first annular mounting portion 9 is integrally connected with a conical sealing portion 10, and the conical sealing portion 10 is integrally connected with a lip portion 11, the first elastic component 5 and the second elastic component 3 both include a second annular mounting portion 13, and the second annular mounting portion 13 is integrally connected with an elastic abutting portion 12,

[0024] The elastic contact portion 12 is in close contact with the tapered sealing portion 10 .

[0025] When in use, the conical sealing portion 10 and the lip portion 11 will contact the inner wall of the syringe piston barrel. During the movement of the piston, the conical sealing portion 10 will be deformed. Due to the high elasticity of the elastic abutment 12, when a gap is formed between the conical sealing portion 10 and the inner wall of the piston barrel, the elastic abutment 12 will push the conical sealing portion 10 toward the inner wall of the piston barrel under the action of high elasticity, thereby performing gap sealing and improving the sealing between the piston and the piston barrel.

[0026] The plug core 1 is provided with a mounting cavity 4, through which the piston rod can be conveniently mounted.

[0027] The front end of the plug core 1 is a conical structure, which facilitates the contact between the plug core 1 and the inner bottom of the piston cylinder.

[0028] Working principle: When in use, the conical sealing part 10 and the lip part 11 will contact the inner wall of the syringe piston barrel. During the movement of the piston, the conical sealing part 10 will be deformed. Due to the high elasticity of the elastic abutment part 12, when a gap is formed between the conical sealing part 10 and the inner wall of the piston barrel, the elastic abutment part 12 will push the conical sealing part 10 toward the inner wall of the piston barrel under the action of high elasticity, thereby sealing the gap and improving the sealing between the piston and the piston barrel. This piston can supplement the elasticity of the sealing component when sealing through the cooperation of the sealing component and the elastic component, thereby improving the sealing of the piston. This piston has a double-layer sealing structure and has a high sealing effect.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-sealing piston, comprising a plug core (1), characterized in that: The outer surface of the plug core (1) is provided with two groups of first mounting grooves (7) and two groups of second mounting grooves (8), the first sealing assembly (2) and the second sealing assembly (3) are respectively installed inside the two groups of the first mounting grooves (7), and the first elastic assembly (5) and the second elastic assembly (6) are respectively installed inside the two groups of the second mounting grooves (8).

2. A high sealing performance piston according to claim 1, characterized in that: The first sealing assembly (2) and the second sealing assembly both comprise a first annular mounting portion (9), the outer surface of the first annular mounting portion (9) being integrally connected to a conical sealing portion (10), and the conical sealing portion (10) being integrally connected to a lip edge portion (11).

3. A high sealing performance piston according to claim 2, characterized in that: The first elastic component (5) and the second elastic component (6) both comprise a second annular mounting portion (13), and the second annular mounting portion (13) is integrally connected with an elastic abutment portion (12).

4. A high sealing performance piston according to claim 3, characterized in that: The elastic abutment portion (12) is in tight abutment with the conical sealing portion (10).

5. A high sealing performance piston according to claim 4, characterized in that: The plug core (1) is provided with a mounting cavity (4).

6. A high sealing performance piston according to claim 5, characterized in that: The front end of the plug core (1) is a conical structure.

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