An adhesive dispensing device capable of exhausting and sealing a piston

Abstract

This utility model belongs to the technical field of dispensing devices, specifically disclosing a dispensing device with a ventable and sealed piston, including a syringe. A ventable and sealed piston assembly is installed inside the syringe. The piston assembly includes a piston block and a vent plug assembly detachably installed inside the piston block. A first sealing mechanism is provided between the piston block and the inner wall of the syringe. A vent hole communicating with the vent plug assembly is opened on the lower side wall of the piston block. This utility model forms a sealed whole by the piston block and the vent plug assembly, giving the piston block assembly the function of venting and sealing, facilitating the discharge of gas from the fluid side inside the syringe. Through the cooperation of the first sealing mechanism and the piston block, a sealed connection is achieved between the piston block and the inner wall of the syringe, reducing leakage between the piston block and the vent plug assembly, thereby obtaining a precise and reliable dispensing device and improving the production efficiency of the dispensing process.

Description

Technical Field

[0001] This utility model relates to the field of dispensing device technology, specifically to a dispensing device with an exhaust-capable and sealed piston. Background Technology

[0002] In the current dispensing field, fluid dispensing accessories, as part of the dispensing device, are usually composed of syringes, pistons, adapters and head plugs, dispensing needles, etc.

[0003] In existing technologies, pistons have various structural forms and are suitable for various types of adhesives or other fluids. Different fluids have different viscosities. In actual dispensing practice, due to the reverse resistance generated by the cohesive force of the fluid, a single thin-walled piston is difficult to push the fluid evenly for dispensing under air pressure. At the same time, the irregular deformation of the thin-walled piston causes gaps to appear between the piston and the syringe. On the one hand, the piston cannot scrape the adhesive off the syringe wall, leaving adhesive residue in the syringe after dispensing. On the other hand, the driving gas enters the fluid side through the gap, causing piston rebound and affecting the dispensing quality.

[0004] To increase piston strength, various reinforced pistons and machined solid pistons have been developed in the past to accommodate different adhesives. However, in dispensing applications, reinforced pistons require a vent plug to expel gas from the adhesive layer. Since the vent plug is pressed into the reinforced piston after dispensing, high-pressure residual gas remains in both the vent plug and the reinforced piston, causing the vent plug to pop out during dispensing. While machined solid pistons with sealing rings can mitigate these shortcomings, they also significantly reduce production capacity and increase product weight due to process limitations. Therefore, we need to propose a dispensing device with a ventable and sealed piston to address these issues. This ventable and sealed piston assembly would improve the precision and reliability of the dispensing device and increase the production efficiency of the dispensing process. Utility Model Content

[0005] The purpose of this invention is to provide a dispensing device with a ventable and sealed piston, which can improve the precision and reliability of the dispensing device and increase the production efficiency of the dispensing process by using a ventable and sealed piston assembly, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a dispensing device with a ventable and sealed piston, comprising a syringe, the head of which is integrally formed with a needle, and a ventable and sealed piston assembly installed inside the syringe. The piston assembly includes a piston block and a vent plug assembly detachably installed inside the piston block. A first sealing mechanism is provided between the piston block and the inner wall of the syringe. A vent hole communicating with the vent plug assembly is opened on the lower side wall of the piston block. The vent hole allows the pressure acting on the vent plug assembly to be balanced. A second sealing mechanism is provided between the vent plug assembly and the piston block.

[0007] Preferably, the lower end of the piston block is tapered, and the upper end of the piston block has a blind hole. A protrusion is integrally formed in the center of the blind hole, and an installation hole for installing the vent plug assembly is provided on the protrusion. The vent hole is located on the upper part of the tapered surface of the piston block, and the vent hole extends laterally through the piston block and communicates with the installation hole.

[0008] Preferably, the first sealing mechanism includes an O-shaped first sealing ring, and the upper outer wall of the piston block is provided with a first mounting groove for installing the first sealing ring, and the outer wall of the first sealing ring abuts against the inner wall of the syringe.

[0009] Preferably, the vent plug assembly includes a cylindrical vent plug block that is movably inserted into the mounting hole and blocks the vent hole.

[0010] Preferably, the upper end of the vent plug is integrally formed with a buckle for fastening to the upper end of the protrusion, and a protrusion is provided below the buckle, with the second sealing mechanism located below the protrusion.

[0011] Preferably, the second sealing mechanism includes an O-shaped second sealing ring, and the outer wall of the vent plug has a second mounting groove for mounting the second sealing ring, and the outer wall of the second sealing ring abuts against the side wall of the mounting hole.

[0012] Preferably, it also includes an adapter, which is threadedly connected to the tail of the syringe. A third sealing ring is provided between the adapter and the syringe. The outer wall of the tail of the syringe is provided with an external thread section for the adapter to be screwed into.

[0013] Preferably, it also includes a head plug, which is threaded onto the needle head, and the needle head has a threaded hole for threading the head plug.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model forms a sealed whole by connecting the piston block and the vent plug assembly, so that the piston block assembly has the function of venting and sealing, which facilitates the discharge of gas from the fluid side inside the syringe. Through the cooperation of the first sealing mechanism and the piston block, a sealed connection between the piston block and the inner wall of the syringe is achieved, reducing leakage between the piston block and the vent plug assembly, thereby obtaining a precise and reliable dispensing device and improving the production efficiency of the dispensing process.

[0016] 2. Through the cooperation of the vent hole and the piston block, this utility model allows the vent hole to discharge gas from the fluid after the glue is poured, and at the same time, it can also balance the pressure acting on the vent plug assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the present invention.

[0019] Figure 3 This is a schematic diagram of the exploded structure of the piston assembly of this utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the piston assembly of this utility model;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the piston block of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the piston assembly of this utility model.

[0023] In the diagram: 1. Adapter; 2. Piston assembly; 21. Piston block; 22. Vent plug assembly; 221. Vent plug block; 222. Second mounting groove; 223. Second sealing ring; 224. Buckle; 225. Protrusion; 23. Vent hole; 24. First sealing ring; 25. First mounting groove; 26. Mounting hole; 27. Protrusion; 28. Connecting plate; 29. ​​Blind hole; 3. Syringe; 4. Needle; 5. Head plug. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6This utility model provides a technical solution: a dispensing device with a ventable and sealed piston, including a syringe 3, the head of which is integrally formed with a needle 4, and a ventable and sealed piston assembly 2 installed inside the syringe 3. The piston assembly 2 includes a piston block 21 and a vent plug assembly 22 detachably installed inside the piston block 21. A first sealing mechanism is provided between the piston block 21 and the inner wall of the syringe 3. A vent hole 23 communicating with the vent plug assembly 22 is opened on the lower side wall of the piston block 21. The vent hole 23 can balance the pressure acting on the vent plug assembly 22. A second sealing mechanism is provided between the vent plug assembly 22 and the piston block 21.

[0026] The piston block 21 and the vent plug assembly 22 form a sealed whole, giving the piston block 21 assembly the function of venting and sealing, which facilitates the discharge of gas from the fluid side inside the syringe 3. Through the cooperation of the first sealing mechanism and the piston block 21, a sealed connection between the piston block 21 and the inner wall of the syringe 3 is achieved, reducing leakage between the piston block 21 and the vent plug assembly 22, thereby obtaining a precise and reliable dispensing device and improving the production efficiency of the dispensing process.

[0027] The lower end of the piston block 21 is tapered, and the upper end of the piston block 21 has a blind hole 29. A protrusion 27 is integrally formed in the center of the blind hole 29. The protrusion 27 has an installation hole 26 for installing the vent plug assembly 22. The vent hole 23 is located on the upper part of the tapered surface of the piston block 21, and the vent hole 23 penetrates the piston block 21 laterally and communicates with the installation hole 26. Multiple connecting plates 28 are fixed on the outer wall of the protrusion 27. The multiple connecting plates 28 are equidistantly distributed around the protrusion 27. The bottom of the piston block 21 containing the vent hole 23 is tapered, which can reduce the resistance of the fluid during the flow process. At the same time, symmetrical vent holes 23 are provided on the upper part of the tapered surface. After the glue is poured, the vent holes 23 can discharge the gas in the fluid. The vent holes 23 are symmetrical or evenly distributed along the circumference, which can make the pressure acting on the vent plug reach a balance.

[0028] The first sealing mechanism includes an O-shaped first sealing ring 24. The upper outer wall of the piston block 21 is provided with a first mounting groove 25 for mounting the first sealing ring 24. The outer wall of the first sealing ring 24 abuts against the inner wall of the syringe 3. There are two first sealing rings 24. The number of first mounting grooves 25 corresponds to the number of first sealing rings 24. The double sealing of the two first sealing rings 24 improves the sealing performance between the piston block 21 and the inner wall of the syringe 3.

[0029] The vent plug assembly 22 includes a cylindrical vent plug block 221, which is movably inserted into the mounting hole 26. The vent plug block 221 blocks the vent hole 23, so that the piston block 21 and the vent plug assembly 22 can form a sealed whole, so that the piston block 21 assembly has the function of venting and sealing.

[0030] The upper end of the breathable plug 221 is integrally formed with a buckle 224 for fastening to the upper end of the protrusion 27. A protrusion 225 is provided below the buckle 224. The second sealing mechanism is located below the protrusion 225. The buckle 224 and the protrusion 27 are fastened together to ensure that the assembly is in place and to prevent the breathable plug 221 from falling off.

[0031] The second sealing mechanism includes an O-shaped second sealing ring 223. The outer wall of the vent block 221 is provided with a second mounting groove 222 for the second sealing ring 223 to be installed. The outer wall of the second sealing ring 223 abuts against the side wall of the mounting hole 26. There are two second sealing rings 223, which are located on both sides of the vent hole 23. After the piston assembly 2 is assembled, there are second sealing rings 223 on the upper and lower sides of the vent hole 23. The second sealing ring 223 at the bottom prevents high-pressure gas from entering the bottom of the vent block 221 and thus exerting an outward force on the vent block 221. The second sealing ring 223 at the top prevents gas exchange between the inside and outside, thus achieving a sealing effect. The vent block 221 and the vent hole 23 are sealed by the second sealing ring 223.

[0032] To facilitate the connection of the syringe 3 with other accessories of the device, an adapter 1 is also included. The adapter 1 is threaded to the tail of the syringe 3. A third sealing ring is provided between the adapter 1 and the syringe 3. The outer wall of the tail of the syringe 3 is provided with an external thread section for the adapter 1 to be screwed in. The third sealing ring is used to improve the sealing between the adapter 1 and the syringe 3. The adapter 1 is responsible for matching the needle 4 with the air pressure system, glue delivery pipeline and other components of the device to ensure that the glue can be smoothly transferred from the device to the needle 4.

[0033] To prevent the glue inside the syringe 3 from leaking when not in use, a head plug 5 is also included. The head plug 5 is threaded onto the needle 4, and the needle 4 has a threaded hole for the head plug 5 to be threaded on. The head plug 5 and the needle 4 are detachable. When not dispensing glue, the head plug 5 is mainly used to seal the front opening of the dispensing needle 4 to prevent the glue from drying, curing or becoming contaminated when not in use. This effectively protects the glue inside the needle 4 and extends the service life of the needle 4.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dispensing device with a ventable and sealed piston, comprising a syringe (3), characterized in that: The head of the syringe (3) is integrally formed with a needle tip (4). The syringe (3) is equipped with a piston assembly (2) that can vent and seal. The piston assembly (2) includes a piston block (21) and a vent plug assembly (22) that is detachably installed inside the piston block (21). A first sealing mechanism is provided between the piston block (21) and the inner wall of the syringe (3). A vent hole (23) communicating with the vent plug assembly (22) is opened on the lower side wall of the piston block (21). The vent hole (23) can make the pressure acting on the vent plug assembly (22) reach balance. A second sealing mechanism is provided between the vent plug assembly (22) and the piston block (21).

2. The dispensing device with a ventable and sealed piston according to claim 1, characterized in that: The lower end of the piston block (21) is tapered, and the upper end of the piston block (21) is provided with a blind hole (29). A protrusion (27) is integrally formed in the center of the blind hole (29). An installation hole (26) for installing the vent plug assembly (22) is provided on the protrusion (27). The vent hole (23) is located on the upper part of the tapered surface of the piston block (21), and the vent hole (23) passes through the piston block (21) laterally and communicates with the installation hole (26).

3. The dispensing device with a ventable and sealed piston according to claim 2, characterized in that: The first sealing mechanism includes an O-shaped first sealing ring (24), and the upper outer wall of the piston block (21) is provided with a first mounting groove (25) for the first sealing ring (24) to be installed. The outer wall of the first sealing ring (24) abuts against the inner wall of the syringe (3).

4. The dispensing device with a ventable and sealed piston according to claim 2, characterized in that: The vent plug assembly (22) includes a cylindrical vent plug (221) which is movably inserted into the mounting hole (26) and blocks the vent hole (23).

5. The dispensing device with a ventable and sealed piston according to claim 4, characterized in that: The upper end of the vent plug (221) is integrally formed with a buckle (224) for fastening to the upper end of the protrusion (27), and a protrusion (225) is provided below the buckle (224), and the second sealing mechanism is located below the protrusion (225).

6. The dispensing device with a ventable and sealed piston according to claim 5, characterized in that: The second sealing mechanism includes an O-shaped second sealing ring (223), and the outer wall of the vent plug (221) is provided with a second mounting groove (222) for the installation of the second sealing ring (223), and the outer wall of the second sealing ring (223) abuts against the side wall of the mounting hole (26).

7. The dispensing device with a ventable and sealed piston according to claim 1, characterized in that: It also includes an adapter (1), which is threaded to the tail of the syringe (3). A third sealing ring is provided between the adapter (1) and the syringe (3). The outer wall of the tail of the syringe (3) is provided with an external thread section for the adapter (1) to be screwed on.

8. The dispensing device with a ventable and sealed piston according to claim 1, characterized in that: It also includes a head plug (5), which is threaded onto the needle (4), and the needle (4) has a threaded hole for the head plug (5) to be threaded.

Images