A dispensing device for detachable one-way valve rear cover

Abstract

The utility model discloses a kind of point gum device of detachable check valve back cover, belong to point gum device technical field, including needle cylinder, piston, head plug, protection assembly, the piston is set in needle cylinder inner top, the protection assembly is installed in the top of needle cylinder, and the lower end of protection assembly and the top of piston are pasted, by installing the check valve of silica gel material in back cover recess, can effectively discharge air remaining in the gap between needle cylinder and back cover in glue subpackaging and vacuumizing process, solve the problem that part of glue is inhibited solidification due to contact air, leading to failure deterioration, adapt to the glue use demand of repulsion reaction to air and water, can also balance the pressure difference of both ends when vacuumizing, avoid unbalanced pressure and pop back cover, guarantee the structural stability of point gum accessory that encapsulation good glue when vacuumizing processing, while back cover detachable design also retains assembly flexibility, facilitate back cover as last link normal assembly operation.

Description

Technical Field

[0001] This utility model relates to the field of dispensing device technology, specifically to a dispensing device with a detachable one-way valve rear cover. Background Technology

[0002] In the current dispensing field, fluid dispensing accessories, as part of the dispensing device, are usually composed of syringes, pistons, adapter back covers and head plugs, dispensing needles, etc. The back cover is an essential part in the storage and transportation of adhesives. Back covers have various structural forms and can be used for various types of adhesives or other fluids. The syringe and back cover, as well as the syringe and head plug, all require sealing. In the adhesive dispensing process, the back cover is usually assembled as the last step, and after assembly, it becomes an independent and complete fluid accessory device.

[0003] In practical applications, some adhesives exhibit a certain degree of repulsion towards air and water. Contact with air inhibits their curing, leading to adhesive failure. Although the syringe, back cover, and head plug are sealed, air from the environment can remain in the gap between the syringe and the back cover during the dispensing process, causing the adhesive to deteriorate. For such adhesives or fluids, vacuuming the packaging syringe is extremely important. When the dispensing accessories containing the sealed adhesive are vacuumed, a pressure difference will form at both ends of the back cover. The unbalanced pressure acting on the back cover will cause it to pop out. Therefore, in order to solve the above-mentioned problems, an improved dispensing device with a detachable one-way valve back cover has been developed. Utility Model Content

[0004] The purpose of this invention is to provide a dispensing device for a detachable one-way valve back cover, which overcomes the problem in the prior art where the back cover pops out during vacuuming, causing vacuuming failure, while ensuring the sealing effect of the adhesive during storage, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dispensing device for a detachable one-way valve rear cover, comprising a syringe, a piston, a head plug, and a protective assembly;

[0006] The piston is located at the top of the syringe, the protective assembly is installed at the top of the syringe, and the lower end of the protective assembly is in contact with the top of the piston. The head plug is installed at the dispensing end of the syringe.

[0007] The protective assembly includes a rear cover and a one-way valve. The rear cover is mounted on the top of the syringe and fits against the top of the piston. The rear cover is concave. The one-way valve is installed in the concave part of the rear cover and is a silicone valve.

[0008] Preferably, a positioning post is fixedly connected to the center of the bottom of the rear cover, and a socket for use with the positioning post is opened at the center of the one-way valve, with the upper end of the positioning post inserted into the socket.

[0009] Preferably, gas channels are provided on both sides of the bottom of the inner cavity of the rear cover. The gas channels are arranged symmetrically, and protrusions integrally formed with the rear cover are provided around the outer side of the gas channels. The lower surface of the one-way valve is attached to the surface of the protrusions.

[0010] Preferably, a positioning ring is integrally formed inside the insertion hole of the one-way valve, and the positioning ring is attached to the surface of the positioning post.

[0011] Preferably, the edge of the upper end of the rear cover is fitted to the edge of the top of the syringe, and the edge of the one-way valve is rounded.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model provides a dispensing device with a detachable one-way valve back cover. By installing a silicone one-way valve in the recess of the back cover, it can effectively discharge the air remaining in the gap between the syringe and the back cover during glue dispensing and vacuuming. This solves the problem that some glues are inhibited from curing and become ineffective and deteriorated due to contact with air. It is suitable for use with glues that repel air and water. At the same time, it can balance the pressure difference between the two ends during vacuuming, preventing the back cover from being ejected due to unbalanced pressure. This ensures the structural stability of the dispensing accessories with the glue sealed during vacuuming. The detachable design of the back cover also retains the flexibility of assembly, making it convenient for the back cover to be used as the final assembly step.

[0014] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0015] Figure 1 This is an exploded view of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the syringe structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the rear cover and one-way valve structure of this utility model;

[0018] Figure 4 This is a partial cross-sectional view of the rear cover and one-way valve structure of this utility model;

[0019] Figure 5 This is a partial cross-sectional view of the rear cover structure of this utility model;

[0020] Figure 6This is a partial cross-sectional view of the one-way valve structure of this utility model.

[0021] The following are the labels in the diagram: 1. Syringe; 2. Piston; 3. Head plug; 4. Protective assembly; 41. Back cover; 42. One-way valve; 43. Positioning pin; 44. Insertion hole; 5. Gas passage; 6. Protrusion; 7. Positioning ring. Detailed Implementation

[0022] 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.

[0023] This utility model provides, for example Figures 1-6 The dispensing device for a detachable one-way valve cover shown includes a syringe 1, a piston 2, a head plug 3, and a protective component 4;

[0024] Piston 2 is located at the top inside syringe 1, protective component 4 is installed on the top of syringe 1, and the lower end of protective component 4 is in contact with the top of piston 2. Head plug 3 is installed at the dispensing end of syringe 1.

[0025] The protective component 4 includes a rear cover 41 and a one-way valve 42. The rear cover 41 is installed on the top of the syringe 1 and fits against the top of the piston 2. The rear cover 41 is concave. The one-way valve 42 is installed in the concave part of the rear cover 41. The one-way valve 42 is a silicone valve.

[0026] The syringe 1 serves as the main container, with the piston 2 located at the top inside the syringe 1. The protective assembly 4 (back cover 41 and silicone one-way valve 42) is installed on the top of the syringe 1 and fits against the piston 2. The head plug 3 seals the dispensing end. The back cover 41 and the inner wall of the syringe 1 are press-fitted to ensure no gas leakage at the mating surface. When the dispensing accessories are subjected to external negative pressure, the one-way valve 42 opens outward, and the gas between the back cover 41 and the syringe 1 is discharged through the gas channel 5 of the back cover 41. After the gas is drawn off, the one-way valve 42 returns to its natural state and fits against the back cover 41 to achieve a seal.

[0027] The interference fit and the one-way valve 42 work together to achieve a double seal, completely blocking gas leakage or permeation path. The one-way valve 42 automatically opens and closes with negative pressure, efficiently expelling residual air in the syringe 1, solving the problem of deterioration of air-sensitive adhesives. The detachable structure retains the assembly flexibility of the adhesive dispensing process, taking into account both sealing performance and ease of operation.

[0028] A positioning post 43 is fixedly connected to the center of the bottom of the rear cover 41. A socket 44 for use with the positioning post 43 is opened at the center of the one-way valve 42. The upper end of the positioning post 43 is inserted into the socket 44.

[0029] The positioning post 43 of the rear cover 41 is precisely connected to the insertion hole 44 of the one-way valve 42 to form a rigid positioning structure. During assembly, the one-way valve 42 is stably fixed in the preset position of the rear cover 41 by inserting the positioning post 43 into the insertion hole 44, ensuring that the one-way valve 42 does not shift during the negative pressure opening and closing process and always maintains the corresponding position with the gas channel 5.

[0030] The cooperation between the positioning pin 43 and the socket 44 enables the quick positioning and assembly of the one-way valve 42, improves production efficiency, prevents the one-way valve 42 from shifting due to negative pressure impact or vibration, ensures that the gas passage 5 is always unobstructed, and ensures stable vacuuming effect.

[0031] Gas channels 5 are provided on both sides of the bottom of the inner cavity of the rear cover 41. The gas channels 5 are symmetrically positioned, and protrusions 6 integrally formed with the rear cover 41 are provided around the outer side of the gas channels 5. The lower surface of the one-way valve 42 is attached to the surface of the protrusions 6. The gas channels 5 provided by the rear cover 41 provide a dedicated path for air flow. A groove is formed between the protrusions 6 and the rear cover 41 (the gap formed by the protrusions 6) so that the one-way valve 42 and the bottom of the rear cover 41 are not fully attached. When there is negative pressure, the gas enters the gas channel 5 through the space above the piston 2, opens the one-way valve 42 and discharges. The groove prevents the one-way valve 42 from sticking to the rear cover 41 over a large area, ensuring that the one-way valve 42 can smoothly return to its natural state and be attached and sealed to the rear cover 41.

[0032] Gas channel 5 directs airflow to improve vacuuming efficiency. The slot effectively prevents the one-way valve 42 from sticking to the back cover 41, ensuring the reliable opening and closing function of the one-way valve 42 and avoiding sealing failure or poor exhaust due to sticking.

[0033] A positioning ring 7 is integrally formed inside the insertion hole 44 of the one-way valve 42, and the positioning ring 7 is attached to the surface of the positioning post 43.

[0034] The positioning ring 7 inside the one-way valve 42 socket 44 fits tightly against the surface of the positioning post 43 of the rear cover 41. By increasing the contact area, the connection stability is enhanced. At the same time, the mating gap between the positioning post 43 and the socket 44 is reduced, reducing the possibility of gas leakage from the mating point. The positioning ring 7 enhances the connection strength between the one-way valve 42 and the positioning post 43, further preventing the one-way valve 42 from shifting, reducing the mating gap, improving the overall sealing performance, and preventing external air from seeping into the syringe 1 from the connection gap.

[0035] The upper edge of the back cover 41 is fitted with the top edge of the syringe 1, and the edge of the one-way valve 42 is rounded.

[0036] The upper edge of the back cover 41 fits tightly with the top edge of the syringe 1. The interference fit further enhances the sealing effect between the syringe 1 and the back cover 41. The rounded corner design of the edge of the one-way valve 42 reduces the frictional resistance with the recess of the back cover 41 during assembly, while preventing the sharp edge from being damaged during repeated opening and closing.

[0037] The edge fit and interference fit provide dual protection, completely blocking the path of external air from entering through the joint between the back cover 41 and the syringe 1. The rounded corner design reduces the assembly difficulty of the one-way valve 42, extends its service life, and ensures the sealing reliability during long-term use.

[0038] In practical use, firstly, the glue is dispensed and injected into the syringe 1. The piston 2 is then placed so that it is in contact with the glue surface. Then, the back cover 41 with the one-way valve 42 is installed on the top of the syringe 1 by interference fit, ensuring that the edge of the back cover 41 is in close contact with the top of the syringe 1. At the same time, the positioning post 43 at the bottom of the back cover 41 is precisely aligned with the insertion hole 44 of the one-way valve 42, so that the one-way valve 42 is stably fixed in the recess of the back cover 41 by the positioning ring 7. The lower surface of the one-way valve 42 is attached to the protrusion 6, forming a gap with the bottom of the back cover 41 formed by the groove. Finally, the head plug 3 is installed to seal the glue-dispensing end of the syringe 1, and the assembly is completed.

[0039] When the syringe 1 needs to be evacuated, under the action of external negative pressure, the residual air between the syringe 1 and the back cover 41 will flow upward and be collected through the symmetrical gas channels 5 on both sides of the back cover 41. This will open the silicone one-way valve 42 outward, allowing the air to be discharged smoothly. After the evacuation is completed, the one-way valve 42 will return to its natural state due to its own elasticity and re-fit against the surface of the protrusion 6 on the back cover 41. With the tight connection between the positioning ring 7 and the positioning post 43, a reliable seal is achieved to prevent the backflow of external air.

[0040] During use, the removable back cover 41 is designed for easy disassembly and assembly as needed. The rounded corner design of the one-way valve 42 reduces frictional resistance during assembly and avoids edge damage during repeated opening and closing. The interference fit and multiple sealing structure ensure that the internal environment of the syringe 1 is isolated from external air and moisture throughout the process, effectively preventing the deterioration of air-sensitive adhesive and ensuring the stability of adhesive performance during dispensing operations.

[0041] 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 for a detachable one-way valve rear cover, characterized in that: Includes syringe (1), piston (2), head plug (3), and protective assembly (4); The piston (2) is located at the top inside the syringe (1), the protective component (4) is installed at the top of the syringe (1), and the lower end of the protective component (4) is in contact with the top of the piston (2), and the head plug (3) is installed at the dispensing end of the syringe (1). The protective component (4) includes a rear cover (41) and a one-way valve (42). The rear cover (41) is installed on the top of the syringe (1) and fits against the top of the piston (2). The rear cover (41) is concave. The one-way valve (42) is installed in the concave part of the rear cover (41). The one-way valve (42) is a silicone valve.

2. The dispensing device for a detachable one-way valve rear cover according to claim 1, characterized in that: A positioning post (43) is fixedly connected to the center of the bottom of the rear cover (41), and a socket (44) for use with the positioning post (43) is opened at the center of the one-way valve (42). The upper end of the positioning post (43) is inserted into the socket (44).

3. The dispensing device for a detachable one-way valve rear cover according to claim 2, characterized in that: Gas channels (5) are provided on both sides of the bottom of the inner cavity of the rear cover (41). The gas channels (5) are arranged symmetrically, and protrusions (6) integrally formed with the rear cover (41) are provided around the outer side of the gas channels (5). The lower surface of the one-way valve (42) is attached to the surface of the protrusions (6).

4. The dispensing device for a detachable one-way valve rear cover according to claim 3, characterized in that: A positioning ring (7) is integrally formed in the insertion hole (44) of the one-way valve (42), and the positioning ring (7) is attached to the surface of the positioning post (43).

5. The dispensing device for a detachable one-way valve rear cover according to claim 4, characterized in that: The edge of the upper end of the back cover (41) is attached to the edge of the top of the syringe (1), and the edge of the one-way valve (42) is rounded.

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