CN215025205U

CN215025205U - Anti-reflux large-flow needle-free glue valve joint

Info

Publication number: CN215025205U
Application number: CN202022909412.0U
Authority: CN
Inventors: 刘云虎
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-12-07
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a prevent large-traffic needleless glue valve joint against current relates to the medical supplies field, establish the shell on case surface including case and cover, the case head is seted up and is annotated the liquid mouth, the liquid outlet is seted up to the afterbody, be equipped with the inner chamber passageway that the intercommunication was annotated liquid mouth and liquid outlet in the case, the head interference fit of shell and case, it is provided with sealed piece to annotate liquid mouthful inner wall, the incision that runs through sealed piece along case axis direction is seted up at sealed piece center, medial surface through being located inner chamber passageway with sealed piece sets up to the bellying, the pressure to the inboard face of liquid in the inner chamber passageway has been increased, thereby extrude sealed piece to the center, the leakproofness has been improved, effectively prevent the liquid reflux. Due to the improvement of the tightness, the interference magnitude of the assembly between the shell and the valve core can be relatively reduced, lubricants such as silica gel and the like do not need to be smeared, the assembly steps are simplified, and the assembly cost is reduced.

Description

Anti-reflux large-flow needle-free glue valve joint

Technical Field

The utility model relates to the field of medical supplies, especially, relate to a large-traffic no adhesive valve connects.

Background

The needleless connector has the characteristics of convenient operation, cleanness and infection prevention, and is particularly suitable for occasions such as injection, transfusion and the like. Another important function of needleless connectors is to prevent blood backflow, which requires sufficient pressure to be applied to the fill port of the connector to prevent backflow. The method generally adopted is that the shell presses the head of the valve core to ensure that the cut is kept closed by adopting larger interference fit of the shell and the valve core at the liquid filling port so as to prevent blood return. And large interference is reserved, and lubricants such as silica gel and the like need to be coated during assembly, so that the assembly cost is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model aims to provide a needleless connector which can effectively prevent the liquid in the valve core from flowing back, thereby reducing the interference when assembling the shell, leading the installation to be simpler and more convenient and saving the assembly cost.

The utility model discloses an above-mentioned function is realized through following technical scheme:

a backflow-preventing large-flow needle-free glue valve joint comprises a valve core and a shell sleeved on the surface of the valve core, wherein an inner cavity channel is formed in the valve core, a liquid injection port is formed in the head of the valve core, and a liquid outlet is formed in the tail of the valve core; the front end opening of shell and the head interference fit of case, it is equipped with sealed piece to annotate liquid mouthful inner wall, the incision that runs through sealed piece along case axis direction is seted up at the center of sealed piece, and the incision is closed state, its characterized in that when not receiving the extrusion of terminal surface injection device: the side surface of the sealing block, which is positioned in the inner cavity channel, is an inner side surface, and the inner side surface is a convex surface.

By adopting the technical scheme, the sealing block is positioned on the inner side surface of the inner cavity channel and protrudes outwards, and when liquid in the inner cavity channel applies pressure to the inner side surface, the sealing block can be extruded towards the center, so that the cut is closed more tightly, liquid backflow is effectively prevented, the pressure resistance of the valve core is improved, and meanwhile, the head of the valve core is promoted to rebound; due to the improvement of the tightness, the interference magnitude of the assembly between the shell and the valve core can be relatively reduced, lubricants such as silica gel and the like do not need to be smeared, the assembly steps are simplified, and the assembly cost is reduced.

Further setting: the inner side surface is a rotating curved surface.

Preferably: the inner side surface is a spherical surface.

Preferably: the inner side surface is an ellipsoid.

Preferably: the inner side surface is a conical surface.

By adopting the technical scheme, on one hand, the inner side surface is a rotating curved surface, so that the cutting direction of the cut is not required to be limited, and the production and the processing are convenient; on the other hand, the pressure resistance and the resilience performance are further improved, the incision is tightly closed, the liquid backflow is prevented, the interference assembling amount can be reduced, and the assembling cost is reduced.

Further setting: the valve core is characterized in that an inclined plane is arranged at the neck of the valve core, and a shell sealing inclined plane matched with the inclined plane is arranged on the shell.

The shell sealing inclined plane on the shell is attached to the inclined plane on the valve core, so that the relative fixation of the positions of the shell and the valve core is ensured, and the sealing property between the shell and the valve core is also ensured.

Further setting: an annular gap is formed between the valve core and the shell, and the annular gap is positioned between the inclined plane and the tail part of the valve core.

Because the case is mostly elastic element, receives pressure to take place elastic deformation, sets up the clearance between case and shell, for its elastic deformation provides certain space, has avoided causing the liquid backward flow because the internal gas pressure of inner chamber passageway is too big.

Further setting: the inner wall of the inner cavity channel is a bell mouth inclined plane, and the inner diameter of the bell mouth inclined plane is gradually increased from the liquid inlet to the liquid outlet.

The inner wall of the inner cavity channel is set to be a bell-mouth inclined plane, so that the flowing speed of liquid in the inner cavity channel is increased, and the flow is increased.

Drawings

FIG. 1 is a schematic cross-sectional view of a backflow prevention high flow needleless valve fitting;

fig. 2 is a schematic view of the force analysis of the inner side 8.

In the figure 1, a valve core; 2. a housing; 21. an upper shell; 22. a lower case; 3. an inner cavity channel; 31. a bell mouth bevel; 4. a liquid injection port; 5. a liquid outlet; 6. a sealing block; 7. cutting; 8. an inner side surface; 9. a bevel; 10. the housing seals the bevel; 11. an annular gap.

Detailed Description

The technical scheme of the utility model is explained by combining the attached drawings.

As shown in fig. 1, the backflow-preventing large-flow needle-free glue valve joint comprises a valve core 1 of a rotating body, an inner cavity channel 3 is formed in the valve core 1, a liquid injection port 4 is formed in the head of the valve core 1, correspondingly, a liquid outlet 5 is formed in the tail of the valve core 1, and the liquid injection port 4 is communicated with the liquid outlet 5 through the inner cavity channel 3. The inner wall of the inner cavity channel 3 is a bell mouth inclined surface 31, the inner diameter of the bell mouth inclined surface 31 is gradually increased from the liquid injection port 4 to the liquid outlet 5, and when the injected liquid is injected from the liquid injection port 4, the flow rate is correspondingly increased. The inner wall of the liquid injection port 4 is provided with a sealing block 6 of a rotating body, the center of the sealing block 6 is provided with a notch 7 which penetrates through the sealing block 6 along the axial direction of the valve core, and the sealing block 6 is the rotating body, so that the direction of the notch 7 is not required to be limited. Luer external threads are arranged at the liquid outlet 5 and can be connected with various luer internal threads or an anode end without threads.

Referring to fig. 1 and 2, the inner side surface 8 of the sealing block 6 located in the inner cavity channel is a convex spherical surface, which is convenient for industrial processing, and when liquid in the inner cavity channel 3 exerts a pressure F on the spherical surface, the sealing block 6 is pressed towards the center by the component force of the pressure F along the direction perpendicular to the section of the inner side surface 8, so that the notch 7 is closed, the head of the valve element 1 is made to rebound, the notch 7 can bear a larger pressure on the inner end surface, and the liquid in the inner cavity channel 3 is prevented from flowing back. At present, the pressure of the head of the valve core 1 of the similar connector is about 2kg generally, and through experimental detection, the pressure of the valve core 1 of the backflow-preventing large-flow needle-free glue valve connector in the embodiment can reach more than 3kg, and the backflow-preventing effect is obvious.

In other embodiments, the inner surface 8 may be a surface of revolution such as a conical surface, a truncated cone surface, or an ellipsoidal surface.

As shown in FIG. 1, the surface of the valve core 1 is sleeved with the outer shell 2, the outer shell 2 comprises an upper shell 21 and a lower shell 22 which are fixedly connected, and the outer shell 2 and the valve core 1 are in interference fit at the liquid injection port 4. Because the sealing block 6 is arranged in the valve core 1, the backflow prevention capability is improved, and compared with the prior art that the head of the valve core 1 is extruded by the shell 2 only to ensure the sealing performance of a product, the interference magnitude of the backflow prevention large-flow needle-free glue valve joint valve core 1 and the shell 2 in the embodiment can be reduced to a certain extent, and lubricants such as silicon oil and the like are not needed to be coated when the valve core 1 and the shell 2 are assembled, so that the assembly steps are simplified, and the assembly cost is saved.

The neck of the valve core 1 is provided with an inclined plane 9, a shell sealing inclined plane 10 matched with the inclined plane 9 is arranged at a corresponding position on the shell 2, and the positions of the shell 2 and the valve core 1 are relatively fixed through the attachment of the shell sealing inclined plane 10 and the inclined plane, so that the sealing performance between the shell 2 and the valve core 1 is also ensured.

An annular gap 11 is arranged between the shell 2 and the valve core 1, and the annular gap 11 is positioned between the inclined surface 9 and the tail part of the valve core 1. Because the valve core 1 is mostly elastic elements such as silicon rubber, elastic deformation can occur during use, and the annular gap 11 can provide a certain space for the elastic deformation, thereby avoiding liquid backflow caused by overlarge air pressure in the inner cavity channel 3.

The existing connector in the market can add medicine only by needle puncture, and the medicine can be added without needle, so that an operator is prevented from pricking hands, the material cost is saved, and the operation is convenient. In addition, the outer side of the port connected with the connector is provided with luer external threads or is not provided with threads, which is subject to practical application occasions.

The above-mentioned embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the present invention.

Claims

1. The backflow-preventing large-flow needleless glue valve joint comprises a valve core (1) and a shell (2) sleeved on the surface of the valve core (1), wherein an inner cavity channel (3) is formed in the valve core (1), a liquid injection port (4) is formed in the head of the valve core (1), and a liquid outlet (5) is formed in the tail of the valve core; the head interference fit of the front end opening of shell (2) and case (1), the rear end opening of shell (2) corresponds the setting with liquid outlet (5), it is equipped with sealed piece (6) to annotate liquid mouth (4) inner wall, incision (7) that run through sealed piece (6) along case (1) axis direction are seted up at the center of sealed piece (6), and incision (7) are the encapsulated situation when not receiving the extrusion of terminal surface injection device, its characterized in that: the side surface of the sealing block (6) positioned in the inner cavity channel (3) is an inner side surface (8), and the inner side surface (8) is a convex surface.

2. The backflow-preventing high-flow needle-free glue valve joint according to claim 1, characterized in that: the inner side surface (8) is a rotating curved surface.

3. The backflow-preventing high-flow needle-free glue valve joint according to claim 1 or 2, characterized in that: the inner side surface (8) is a spherical surface.

4. The backflow-preventing high-flow needle-free glue valve joint according to claim 1 or 2, characterized in that: the inner side surface (8) is an ellipsoid.

5. The backflow-preventing high-flow needle-free glue valve joint according to claim 1 or 2, characterized in that: the inner side surface (8) is a conical surface.

6. The backflow-preventing high-flow needle-free glue valve joint according to claim 1 or 2, characterized in that: the valve core (1) is characterized in that an inclined plane (9) is arranged at the neck part, and a shell sealing inclined plane (10) matched with the inclined plane (9) is arranged on the shell (2).

7. The backflow-preventing high-flow needle-free glue valve joint according to claim 6, characterized in that: an annular gap (11) exists between the valve core (1) and the shell (2), and the annular gap (11) is located between the inclined plane (9) and the tail part of the valve core (1).

8. The backflow-preventing high-flow needle-free glue valve joint according to claim 1 or 2, characterized in that: the inner wall of the inner cavity channel (3) is a bell-mouth inclined plane (31), and the inner diameter of the bell-mouth inclined plane (31) is gradually increased from the liquid injection port (4) to the liquid outlet (5).