An airtightness testing device

Abstract

This utility model relates to the field of syringe manufacturing technology and discloses an airtightness testing device, including a platform. A support side plate is fixedly connected to one side of the upper end face of the platform, and a fixing plate is connected to one side of the support side plate. A connecting column is connected to the lower end face of the fixing plate, and an airtightness testing head for supplying air to the injection end of the syringe to be tested for airtightness testing is connected to the lower end of the connecting column. This utility model can provide basic protection for the opening of the water tank by setting a shielding structure. Secondly, when the syringe is inserted, its inner lip fits against the outer wall by elastic deformation, forming a double seal with the inner protrusion, completely blocking the contact between the test water and the air, avoiding the water from being contaminated by dust, microorganisms and oxidation, and maintaining the long-term cleanliness of the water. After the syringe is pulled out, the dust cover quickly closes the lip by elasticity to prevent impurities from adhering and negative pressure from being sucked in, achieving no leakage during insertion and no contamination during withdrawal.

Description

Technical Field

[0001] This utility model relates to the field of syringe manufacturing and processing technology, and in particular to an airtightness testing device. Background Technology

[0002] As a core tool in the medical field for the precise injection of gases or liquids, the safety and reliability of syringes directly affect patient health and treatment outcomes. The airtightness of the connection between the syringe barrel conical connector and the needle hub is a key indicator to ensure its performance. In clinical applications, if there is an airtightness defect in this connection, it may lead to drug leakage, gas entering the human body and causing embolism, or the penetration of external contaminants affecting the purity of the drug. Therefore, in the syringe manufacturing and assembly process, it is necessary to strictly test the sealing performance of the syringe barrel conical connector, the integrity of the needle hub, and the overall airtightness of the assembled syringe barrel and piston rod structure.

[0003] Application No. 202122392363.2 discloses a syringe airtightness testing device. This device delivers air to the syringe injection end through an airtightness testing tip and uses a water tank to observe bubbles to determine airtightness, which to some extent meets basic testing requirements. However, the water tank used in this device has an open structure and lacks an effective sealing and protection mechanism. The testing water is exposed to the air for a long time, making it easy to come into contact with dust and microorganisms in the air, leading to the growth of bacteria, mold and other microorganisms, forming polluted water, and failing to maintain the clean environment required for testing. Secondly, during the testing process, the lower end of the syringe must be completely immersed in the water in the water tank. If the water has already grown microorganisms or mixed with impurities, the contaminants will adhere to the inside or surface of the syringe through the syringe opening or connection gap, causing poor airflow during air delivery, and even false bubbles or blocked bubbles, interfering with the tester's observation and judgment of bubbles, resulting in misjudgment of airtightness as qualified or unqualified, seriously affecting the accuracy and reliability of the test results. Utility Model Content

[0004] This invention proposes an airtightness testing device to solve the problems of potential contamination and misjudgment caused by existing testing devices.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an airtightness testing device, comprising a platform, a supporting side plate fixedly connected to one side of the upper end face of the platform, a fixing plate connected to one side of the supporting side plate, a connecting column connected to the lower end face of the fixing plate, an airtightness testing head connected to the lower end of the connecting column for supplying air to the injection end of the syringe to be tested for airtightness testing, a water storage tank for containing test water provided directly below the airtightness testing head, a bearing plate connected to the lower end of the water storage tank via a rod, a shielding structure provided on the water storage tank for shielding the opening of the water storage tank and achieving dynamic sealing, and a processing component provided on the outside of the water storage tank for circulating and filtering the test water in the water storage tank.

[0006] Preferably, the shielding structure includes a cover plate embedded in the opening end of the water storage tank, a silicone dust cover is connected to the cover plate, and a plurality of protrusions are fixedly connected to the inner surface of the silicone dust cover.

[0007] Preferably, the shielding structure further includes an insert block fixedly connected to the outer wall of the cover plate, and the insert block has a slot on its outer side and located on the inner wall of the water storage tank.

[0008] Preferably, the processing assembly includes a housing connected to the upper surface of the support plate, and a polyethersulfone membrane filter and a mixed cellulose ester membrane filter are sequentially connected inside the housing.

[0009] Preferably, the processing assembly further includes a water circulation pump mounted on the upper surface of the support plate and located on one side of the tank. One end of the water circulation pump is connected to a liquid extraction pipe, the inlet end of which penetrates and extends into the interior of the water storage tank. The other end of the water circulation pump is connected to a delivery pipe, the outlet end of which penetrates and extends into the interior of the tank. The end of the tank away from the delivery pipe is connected to a connecting pipe, the outlet end of which penetrates and extends into the interior of the water storage tank.

[0010] Preferably, a fixing frame is fixedly connected to the other side of the upper end face of the platform, and an installation hole is opened on the upper end face of the fixing frame below the airtightness testing end. A fixing component is installed on the outside of the installation hole and on the fixing frame.

[0011] Preferably, a support frame is installed on the lower end face of the platform, a hydraulic cylinder is installed on the support frame, the output end of the hydraulic cylinder is connected to the lower end face of the bearing plate, and a backing plate is fixedly connected to the inner wall of the water storage tank.

[0012] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0013] (1) This application has a shielding structure. Through the cooperation of the insert and the slot, the cover tightly seals the opening of the water tank to form basic protection. Secondly, when the syringe is inserted, its inner lip fits the outer wall with elastic deformation and forms a double seal with the inner protrusion, completely blocking the contact between the test water and the air, avoiding the water from being contaminated by dust and microorganisms and oxidized and deteriorated, and maintaining the water quality for a long time. After the syringe is pulled out, the dust cover closes the lip quickly with elasticity to prevent impurities from adhering and being sucked in by negative pressure, so as to achieve no leakage when inserted and no contamination when pulled out. This structure eliminates the risk of syringe contamination on the one hand and avoids impurities from interfering with bubble observation on the other hand, greatly improving the detection accuracy and making up for the shortcomings of traditional open water tanks.

[0014] (2) This application is equipped with a component for processing the water tank. With the help of the synergistic filtration effect of the dual filter elements, it can efficiently intercept suspended impurities and most microorganisms in the test water, significantly reduce the microbial base of the water body from a physical level, and continuously maintain the cleanliness and stability of the water quality in the water tank. This solves the problem that the test water in traditional open water tanks is prone to turbidity and pollution due to long-term use. On the one hand, it can ensure that the syringe is not contaminated by water or adhering to pollutants when it is immersed in the test, completely eliminating the safety hazards in the subsequent use of the syringe and strictly meeting the requirements for sterile production of medical devices. On the other hand, it can ensure that there are no impurities in the water body during the test, and the staff can clearly observe the bubble generation, effectively avoiding the test misjudgment caused by impurities, and further improving the reliability and consistency of the airtightness test results. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a cross-sectional schematic diagram of the water storage tank of this utility model;

[0019] Figure 4 This is an enlarged schematic diagram of the shielding structure of this utility model connected to the water storage tank;

[0020] Figure 5 This is a schematic diagram of the structure of the processing component of this utility model;

[0021] In the diagram: 1. Platform; 2. Support frame; 3. Support side plate; 4. Fixing plate; 5. Connecting column; 6. Air tightness test end; 7. Fixing frame; 8. Water storage tank; 9. Bearing plate; 10. Hydraulic cylinder; 11. Shielding structure; 111. Cover plate; 112. Silicone dust cover; 113. Protrusion; 114. Slot; 115. Insert block; 12. Processing component; 121. Box body; 122. Polyethersulfone membrane filter element; 123. Mixed cellulose ester membrane filter element; 124. Water circulation pump; 125. Liquid extraction pipe; 126. Delivery pipe; 127. Connecting pipe; 13. Mounting hole; 14. Fixing component; 15. Backing plate. 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] like Figures 1-2 As shown, an airtightness testing device includes a platform 1. A support side plate 3 is fixedly connected to one side of the upper end face of the platform 1. A fixing plate 4 is connected to one side of the support side plate 3. A connecting column 5 is connected to the lower end face of the fixing plate 4. An airtightness testing end head 6 is connected to the lower end of the connecting column 5 for supplying air to the injection end of the syringe to be tested for airtightness testing. (The specific structure and principle of the airtightness testing end head 6 are the same as those in the prior art application with application number 202122392363.2, which discloses an airtightness testing end head in a syringe.) A water storage tank 8 for holding test water is provided directly below the airtightness testing end head 6. A bearing plate 9 is connected to the lower end of the water storage tank 8 through a rod.

[0024] A fixing frame 7 is fixedly connected to the other side of the upper end face of the platform 1. A mounting hole 13 is opened on the upper end face of the fixing frame 7 and below the airtightness testing end 6. A fixing component 14 is installed on the outside of the mounting hole 13 and on the fixing frame 7. (The fixing component 14 is a common structure that clamps the syringe by screwing. It usually consists of an adjustable screwing part, a clamping seat and an anti-slip pad. The distance between the seats is adjusted by manual or semi-automatic screwing to achieve stable fixation of the syringe and avoid displacement that affects the detection accuracy. This type of screwing clamping structure has been widely used in the fields of medical device testing and small workpiece fixing for a long time. It is a well-known existing technology in this field, and the relevant details have been fully disclosed in the published literature and equipment. Therefore, there is no need to describe its detailed structure and principle in detail.)

[0025] A support frame 2 is installed on the lower end face of the platform 1, and a hydraulic cylinder 10 is installed on the support frame 2. The output end of the hydraulic cylinder 10 is connected to the lower end face of the bearing plate 9, and a backing plate 15 is fixedly connected to the inner wall of the water storage tank 8.

[0026] In addition, a forward and reverse motor is installed in the slot reserved in the inner wall of the support side plate 3. The output end of the forward and reverse motor is connected to a lead screw, and a threaded block is connected to the external thread of the lead screw. One end of the threaded block is fixedly connected to the fixing plate 4.

[0027] Specifically, before testing, the syringe barrel is first inserted through the mounting hole 13 on the fixing bracket 7, and then the syringe is fixed by the fixing component 14. Then, the water tank 8 is moved upward by the hydraulic cylinder 10, so that the end of the syringe is inserted into the water tank 8 and contacts the back plate 15. Next, the lead screw is driven by the forward and reverse motor to rotate, so that it drives the fixing plate 4 downward through the threaded block, so that the groove sleeve reserved at the airtightness testing end 6 is aligned with the outside of the injection end of the syringe. After the alignment is completed, air is continuously supplied to the injection end of the syringe by the airtightness testing end 6. Finally, the airtightness of the syringe is judged by observing whether bubbles are generated in the water in the water tank 8. If no bubbles are generated in the water, it means that the syringe is airtight; if bubbles are generated, it means that the syringe has a sealing defect and the airtightness is unqualified.

[0028] Among them, see Figures 3-4 As shown, the water storage tank 8 is provided with a shielding structure 11, which is used to shield the opening of the water storage tank 8 and achieve dynamic sealing.

[0029] The shielding structure 11 includes a cover plate 111 embedded in the opening end of the water tank 8. A silicone dust cover 112 is connected to the cover plate 111, and multiple protrusions 113 are fixedly connected to the inner surface of the silicone dust cover 112.

[0030] The shielding structure 11 also includes a plug 115 fixedly connected to the outer wall of the cover plate 111. The plug 115 has a slot 114 on its outer side and located on the inner wall of the water tank 8. After the plug 115 is inserted into the slot 114, it is then fastened with screws.

[0031] Through the above technical solution:

[0032] In use, the insert 115 is inserted into the slot 114, so that the cover 111 covers the opening of the water tank 8, which can shield the water tank 8. When the syringe is inserted into the water tank 8, the inner lip of the silicone dust cover 112 on the cover 111 fits tightly against the outer wall of the syringe through its own elastic deformation. At the same time, it forms a double sealing structure with the inner protrusion 113, which can completely block the contact between the test water in the water tank 8 and the outside air, avoid the water from being contaminated by dust, microorganisms and oxidation, and maintain the long-term cleanliness of the water. When the syringe is removed after the test is completed, the elasticity of the silicone dust cover 112 quickly closes the lip, preventing the adhesion of impurities and the suction of negative pressure, achieving "no leakage when inserted and no contamination when removed". This structure eliminates the risk of syringe contamination, ensures safe use and meets the requirements of sterility. On the other hand, it avoids impurities from interfering with bubble observation, greatly improves the accuracy of detection, and fully makes up for the shortcomings of traditional open water tanks.

[0033] See Figure 3 and Figure 5 As shown, a processing component 12 is provided on the outside of the water storage tank 8 for circulating and filtering the test water in the water storage tank 8.

[0034] The processing assembly 12 includes a housing 121 connected to the upper end face of the support plate 9, and a polyethersulfone membrane filter element 122 and a mixed cellulose ester membrane filter element 123 are sequentially connected inside the housing 121.

[0035] The processing assembly 12 also includes a water circulation pump 124 installed on the upper surface of the support plate 9 and located on one side of the housing 121. One end of the water circulation pump 124 is connected to a liquid extraction pipe 125. The inlet end of the liquid extraction pipe 125 passes through and extends into the interior of the water storage tank 8. The other end of the water circulation pump 124 is connected to a delivery pipe 126. The outlet end of the delivery pipe 126 passes through and extends into the interior of the housing 121. The end of the housing 121 away from the delivery pipe 126 is connected to a connecting pipe 127. The outlet end of the connecting pipe 127 passes through and extends into the interior of the water storage tank 8.

[0036] Through the above technical solution:

[0037] When loading and unloading the syringe, the water circulation pump 124 is turned on, and the test water in the water storage tank 8 is drawn out through the extraction pipe 125 and transported to the water storage tank 8 through the delivery pipe 126. The water then passes through the polyethersulfone membrane filter 122 and the mixed cellulose ester membrane filter 123 in sequence. The polyethersulfone membrane filter 122 can intercept suspended impurities in the water, while the mixed cellulose ester membrane filter 123 can retain most microorganisms, which significantly reduces the microbial base of the water from a physical level, realizing dual filtration treatment of the test water. The treated clean water flows back to the water storage tank 8 through the connecting pipe 127, forming a closed-loop water circulation of "extraction-filtration-return". This operation can not only continuously maintain the cleanliness and stability of the water quality and avoid turbidity and pollution of the test water, but also ensure that the syringe is uncontaminated and that the bubble observation is uninterrupted to improve the accuracy of the test, while extending the water replacement cycle and reducing operating costs.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leak tightness testing device comprising a platen (1), characterized in that: A support side plate (3) is fixedly connected to one side of the upper end face of the platform (1). A fixing plate (4) is connected to one side of the support side plate (3). A connecting column (5) is connected to the lower end face of the fixing plate (4). An airtightness detection end (6) is connected to the lower end of the connecting column (5) for supplying air to the injection end of the syringe to be tested for airtightness testing. A water storage tank (8) for containing test water is provided directly below the airtightness detection end (6). A bearing plate (9) is connected to the lower end of the water storage tank (8) through a rod. A shielding structure (11) is provided on the water storage tank (8) for shielding the opening of the water storage tank (8) and achieving dynamic sealing. A processing component (12) is provided on the outside of the water storage tank (8) for circulating and filtering the test water in the water storage tank (8).

2. The air tightness detection device according to claim 1, wherein: The shielding structure (11) includes a cover plate (111) embedded in the opening end of the water tank (8), and a silicone dust cover (112) is connected to the cover plate (111). Multiple protrusions (113) are fixedly connected to the inner surface of the silicone dust cover (112).

3. The air tightness detection device according to claim 2, wherein: The shielding structure (11) also includes a plug (115) fixedly connected to the outer wall of the cover plate (111), and the plug (115) has a slot (114) on its outer side and located on the inner wall of the water storage tank (8).

4. The air tightness detection device of claim 1, wherein: The processing assembly (12) includes a housing (121) connected to the upper end face of the support plate (9), and a polyethersulfone membrane filter element (122) and a mixed cellulose ester membrane filter element (123) are connected in sequence inside the housing (121).

5. The air tightness testing apparatus of claim 4, wherein: The processing component (12) also includes a water circulation pump (124) installed on the upper surface of the support plate (9) and located on one side of the tank (121). One end of the water circulation pump (124) is connected to a liquid extraction pipe (125). The inlet end of the liquid extraction pipe (125) extends through and into the interior of the water storage tank (8). The other end of the water circulation pump (124) is connected to a delivery pipe (126). The outlet end of the delivery pipe (126) extends through and into the interior of the tank (121). The end of the tank (121) away from the delivery pipe (126) is connected to a connecting pipe (127). The outlet end of the connecting pipe (127) extends through and into the interior of the water storage tank (8).

6. The air tightness detection device of claim 1, wherein: A mounting bracket (7) is fixedly connected to the other side of the upper end face of the platform (1). An installation hole (13) is provided on the upper end face of the mounting bracket (7) and below the airtightness testing end (6). A fixing component (14) is installed on the outside of the installation hole (13) and on the mounting bracket (7).

7. The air tightness detection device of claim 1, wherein: A support frame (2) is installed on the lower end face of the platform (1), and a hydraulic cylinder (10) is installed on the support frame (2). The output end of the hydraulic cylinder (10) is connected to the lower end face of the bearing plate (9), and a stop plate (15) is fixedly connected to the inner wall of the water storage tank (8).

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