Annular contact switch and air suction leak detection integrated structure

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By integrating a ring-shaped contact switch with an air intake leak detection structure, and using the hand-operated insertion of the air bag tube to control the vacuum pump, combined with a time delay relay and a pressure sensor, the problems of cumbersome detection and contamination in existing technologies are solved, achieving high efficiency, convenience and accuracy in air bag leak detection.

CN224594147UActive Publication Date: 2026-08-04QINGDAO HUAREN MEDICAL PROD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: QINGDAO HUAREN MEDICAL PROD
Filing Date: 2025-08-21
Publication Date: 2026-08-04

AI Technical Summary

Technical Problem

Existing technologies for detecting whether disposable peritoneal dialysis drainage bags are leaking are cumbersome, inefficient, and prone to product contamination, especially the inflation, immersion, and compression detection methods, which cannot monitor pressure values in real time.

Method used

A ring-shaped contact switch and a suction leak detection integrated structure are designed. The action of inserting the air bag tube by hand synchronously controls the pressing of the housing to realize the start and stop of the vacuum pump. Combined with a time delay relay and a pressure sensor, the convenience and accuracy of detection are ensured.

Benefits of technology

It achieves efficient and convenient operation for air bag leakage detection, avoids product contamination, and can monitor pressure changes in real time to accurately determine whether the air bag is leaking.

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Abstract

The utility model relates to a vacuum pumping detection device technical field, concretely relates to a kind of annular contact switch and suction leak detection integrated structure.The utility model includes detection platform, and at least one set of annular contact switch being set on detection platform, and annular contact switch includes following structure: the inside of detection platform is embedded in the one end of fixed base and is connected to vacuum pump by hose, and its other end movably is provided with switch body;Switch body includes the press shell of tubular setting, the suction nozzle in the center of press shell and the spring in the inside of press shell;Suction nozzle extends inward along press shell center and is connected with hose through fixed base penetration.This utility model utilizes hand to be inserted into the action of air bag insertion tube synchronously to make press shell action, reduce the step of separate operation button, realize detection operation and vacuum pump control efficient integration;Detection platform is changed into suction vacuum pumping detection, avoid pollution to bag body in detection process, guarantee detection environment and bag body quality.

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Description

Technical Field

[0001] This utility model relates to the technical field of vacuum detection devices, specifically to an integrated structure of a ring contact switch and a suction leak detection device. Background Technology

[0002] The products manufactured are disposable peritoneal dialysis bags, and each one needs to be tested for leaks. Currently, there are testing methods such as inflation, immersion in water, compression, and suction. However, inflation, immersion in water, and compression can easily cause secondary contamination of the product, rendering it unusable after testing. Although there are gas detectors, such as the one disclosed in Chinese Patent Publication No. CN221550643U, which can avoid secondary contamination and deformation, this solution still has shortcomings: during testing, the operator must keep their hands still until the leak detection is complete, which is both labor-intensive and inefficient; moreover, pressure testing for leaks is time-consuming, and pressure values cannot be measured during the testing process. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an integrated structure of ring contact switch and air intake leak detection.

[0004] The technical solution adopted in this utility model is as follows: A ring-shaped contact switch integrated with a suction leak detection structure includes a detection platform and at least one set of ring-shaped contact switches disposed on the detection platform. The ring-shaped contact switches include the following structure: The fixed base is hollow and cylindrical, with one end embedded in the interior of the detection platform and connected to the vacuum pump through a hose, and the other end is movably equipped with a switch body. The switch body includes a cylindrical pressing housing, an air intake nozzle located at the center of the pressing housing, and a spring located inside the pressing housing. The air intake nozzle extends inward along the center of the pressing housing and passes through a fixed base to connect with a flexible hose. The spring applies a preload to the pressing housing, creating a certain gap between the pressing housing and the fixed base. A silicone pad is placed between the spring and the fixed base. Limiting contacts are provided on the peripheral side of the pressing housing. The limiting contacts include a movable contact on the pressing housing and a fixed contact mounted on the fixed base. The movable contact contacts relative to or separate from the fixed contact as the pressing housing moves, thereby controlling the start and stop of the vacuum pump.

[0005] This technical solution utilizes the hand's action of inserting the air bag tube to simultaneously activate the pressing housing, thereby connecting the suction nozzle for air extraction. This achieves efficient integration of detection operation and vacuum pump control, resulting in more accurate and convenient air bag leak detection. The detection platform is changed to suction and vacuum detection, preventing bag contamination. The switch button is replaced with a human-touch switch, positioned around the vacuum suction port, reducing the need for a separate button operation. Specifically, a spring preload maintains a gap between the pressing housing and the fixed base. When the operator presses down, the moving contact contacts the fixed contact, forming an electrical circuit and activating the vacuum pump to create a negative pressure environment for leak detection. The operation is simple and highly integrated.

[0006] In addition, the annular contact switch and air intake leak detection integrated structure proposed above according to this utility model can also have the following additional technical features: According to one embodiment of the present invention, the cross-section of the pressing shell is annular, and the air inlet in the middle is inserted into the air bag tube. The insertion operation is performed manually by the operator. When the operator applies force forward naturally, the hand contacts the pressing shell and exerts a force on the pressing shell. The force is greater than the preload of the spring inside the pressing shell, and the spring undergoes elastic deformation.

[0007] In this technical solution, the spring applies a preload to the pressing housing, bringing it to an initial stable state and maintaining a certain gap with the fixed base. At this point, the limit contact separates, and the circuit is broken. When the operator applies force greater than the spring's preload, the spring deforms, the pressing housing moves, the limit contact engages, and the circuit is completed, thereby controlling the vacuum pump to operate, enabling the pumping of air from the gas bag and subsequent leak detection. When the hand is removed, the spring applies a restoring force to the pressing housing, and the limit contact separates.

[0008] According to one embodiment of the present invention, when the spring deforms, the pressing shell generates axial displacement, causing the limiting contacts provided on the pressing shell to come into contact with each other, forming an electrical conduction circuit; the vacuum pump of the electrical conduction circuit starts to run, and the suction nozzle is controlled to draw air through the hose connected to the vacuum pump, so that a negative pressure environment is formed inside the air bag.

[0009] In this technical solution, the limit contact makes contact, converting mechanical displacement into an electrical signal to form an electrical conduction circuit; the electrical conduction circuit triggers the operation of the vacuum pump, which generates negative pressure through the hose, and uses the flow characteristics of gas to transmit the negative pressure to the suction nozzle, thereby creating a negative pressure environment inside the air bag. The whole process realizes the conversion and transmission from mechanical force to electrical signal and then to gas pressure change.

[0010] According to one embodiment of the present invention, the electrical conduction circuit is further provided with a time delay relay, which keeps the electrical conduction circuit in a locked state, allowing the vacuum pump to run continuously for a period of time, and forming a sustained negative pressure inside the air bag.

[0011] In this technical solution, relying solely on contact points means that if the operator's hand loosens even slightly, the contacts separate, the circuit breaks, the vacuum pump stops, and a stable negative pressure cannot be formed. By setting a time-delay relay in the electrical conduction circuit, the circuit can be continuously locked during the brief separation of the contacts, thereby maintaining the negative pressure inside the air bag more stably and reliably.

[0012] According to one embodiment of the present invention, a pressure sensor and a pressure gauge are also provided on the electrical conduction circuit. The pressure sensor is connected to the access hose through a special connector, and the pressure gauge is installed above the annular contact switch of the detection platform.

[0013] In this technical solution, the pressure sensor can acquire the pressure data inside the air bag in real time. At the same time, the pressure gauge is installed above the ring contact switch on the detection platform, which is convenient for the operator to observe and thus accurately determine whether the pressure inside the air bag meets the detection requirements.

[0014] According to one embodiment of the present invention, the pressure value of the pressure gauge is increased from -50KPa to -20KPa to determine whether the bag is leaking.

[0015] In this technical solution, after the air bag is evacuated to create a negative pressure environment, if the air bag is well-sealed, the internal gas volume remains essentially constant, and the pressure value will remain relatively stable within a certain range under the influence of external atmospheric pressure. However, when the air bag leaks, the internal gas gradually leaks out, and the gas volume decreases. Therefore, by setting a specific pressure range from -50 kPa to -20 kPa as the criterion, the pressure change, as an intuitive and quantifiable indicator, can accurately reflect whether the air bag is leaking.

[0016] Compared with the prior art, this utility model has the following advantages: (1) Convenient and efficient operation: The action of inserting the air bag tube by hand is synchronized with the action of pressing the shell, reducing the steps of operating the button separately, realizing efficient integration of detection operation and vacuum pump control, and accurately and conveniently completing the air bag leakage detection.

[0017] (2) Save manpower and facilitate observation: The electrical conduction circuit is equipped with a time delay relay so that the circuit is continuously locked when the contacts are briefly separated, and the negative pressure inside the air bag is stably maintained; a pressure gauge is also set to obtain pressure data in real time, and the bag can be accurately judged to be leaking through a specific pressure change range.

[0018] (2) Prevent bag contamination: Change the testing platform to vacuum testing to avoid contaminating the bag during the testing process and ensure the testing environment and bag quality. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention.

[0020] Figure 2 This is a cross-sectional view of the present invention.

[0021] In the diagram: 1. Detection platform; 2. Fixing base; 3. Switch body; 31. Air intake nozzle; 32. Pressing housing; 33. Limit contact; 34. Spring; 35. Silicone pad; 36. Locking inner sleeve; 4. Air bag tube. 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, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1 like Figures 1 to 2 As shown, this embodiment provides an integrated structure of a ring contact switch and a suction leak detection, including a detection platform 1 and at least one set of ring contact switches disposed on the detection platform 1. The ring contact switches include the following structure: The fixed base 2 is hollow and cylindrical. One end of it is embedded in the interior of the detection platform 1 and connected to the vacuum pump through a hose. The other end of it is movably equipped with a switch body 3. The switch body 3 includes a cylindrical pressing housing 32, an air intake 31 located at the center of the pressing housing 32, and a spring 34 located inside the pressing housing 32. The air intake 31 extends inward along the center of the pressing housing 32 and passes through the fixing seat 2 to connect with a hose. The spring 34 applies a preload to the pressing housing 32, creating a certain gap between the pressing housing 32 and the fixing seat 2. A silicone pad 35 is provided between the spring 34 and the fixing seat 2. A limit contact 33 is provided on the peripheral side of the pressing housing 32. The limit contact 33 includes a movable contact on the pressing housing 32 and a fixed contact mounted on the fixing seat 2. The movable contact contacts or separates from the fixed contact as the pressing housing 32 moves, thereby controlling the start and stop of the vacuum pump.

[0024] like Figures 1 to 2As shown, this technical solution utilizes the action of inserting the air bag tube 4 by hand to simultaneously activate the pressing housing 32, thereby connecting the suction nozzle 31 for air extraction. This achieves efficient integration of detection operation and vacuum pump control, resulting in more accurate and convenient air bag leakage detection. The detection platform 1 is modified to perform suction and vacuum detection, preventing bag contamination. The switch button is replaced with a human touch switch, positioned around the vacuum suction port, reducing the need for a separate button operation. Specifically, the pre-tension force of the spring 34 maintains a gap between the pressing housing 32 and the fixed base 2. When the operator applies pressure, the moving contact and the fixed contact form an electrical circuit, activating the vacuum pump to create a negative pressure environment for leak detection. The operation is simple and highly integrated.

[0025] In addition, the annular contact switch and air intake leak detection integrated structure proposed above according to this utility model can also have the following additional technical features: According to one embodiment of the present invention, the cross-section of the pressing housing 32 is annular, and the air inlet 31 in the middle is inserted into the air bag tube 4. The insertion operation is performed manually by the operator. When the operator applies force forward naturally, the hand contacts the pressing housing 32 and exerts a force on the pressing housing 32. The force is greater than the preload of the spring 34 inside the pressing housing 32, and the spring 34 undergoes elastic deformation.

[0026] In this technical solution, the spring 34 applies a preload to the pressing housing 32, bringing it to an initial stable state and maintaining a certain gap with the fixed base 2. At this time, the limiting contact 33 separates, and the circuit is disconnected. When the operator applies force greater than the preload of the spring 34, the spring 34 deforms, the pressing housing 32 moves, the limiting contact 33 contacts, the circuit is connected, and the vacuum pump is controlled to operate, enabling the pumping of air from the air bag and subsequent leak detection. When the hand is removed, the spring 34 applies a restoring force to the pressing housing 32, and the limiting contact 33 separates.

[0027] According to one embodiment of the present invention, when the spring 34 deforms, the pressing housing 32 generates axial displacement, causing the limiting contacts 33 provided on the pressing housing 32 to come into contact with each other, forming an electrical conduction circuit; the vacuum pump of the electrical conduction circuit starts to run, and the suction nozzle 31 is controlled to draw air through the hose connected to the vacuum pump, so that a negative pressure environment is formed inside the air bag.

[0028] In this technical solution, the limit contact 33 makes contact, converting mechanical displacement into an electrical signal to form an electrical conduction circuit; the electrical conduction circuit triggers the operation of the vacuum pump, which generates negative pressure through the hose, and uses the flow characteristics of gas to transmit the negative pressure to the suction nozzle 31, thereby creating a negative pressure environment inside the air bag. The whole process realizes the conversion and transmission from mechanical force to electrical signal and then to gas pressure change.

[0029] According to one embodiment of the present invention, the electrical conduction circuit is further provided with a time delay relay, which keeps the electrical conduction circuit in a locked state, allowing the vacuum pump to run continuously for a period of time, and forming a sustained negative pressure inside the air bag.

[0030] In this technical solution, relying solely on contact points means that if the operator's hand loosens even slightly, the contacts separate, the circuit breaks, the vacuum pump stops, and a stable negative pressure cannot be formed. By setting a time-delay relay in the electrical conduction circuit, the circuit can be continuously locked during the brief separation of the contacts, thereby maintaining the negative pressure inside the air bag more stably and reliably.

[0031] According to one embodiment of the present invention, a pressure sensor and a pressure gauge are also provided on the electrical conduction circuit. The pressure sensor is connected to the access hose through a special connector, and the pressure gauge is installed above the annular contact switch of the detection platform 1.

[0032] In this technical solution, the pressure sensor can acquire the pressure data inside the air bag in real time. At the same time, the pressure gauge is installed above the ring contact switch on the detection platform, which is convenient for the operator to observe and thus accurately determine whether the pressure inside the air bag meets the detection requirements.

[0033] According to one embodiment of the present invention, the pressure value of the pressure gauge is increased from -50KPa to -20KPa to determine whether the bag is leaking.

[0034] In this technical solution, after the air bag is evacuated to create a negative pressure environment, if the air bag is well-sealed, the internal gas volume remains essentially constant, and the pressure value will remain relatively stable within a certain range under the influence of external atmospheric pressure. However, when the air bag leaks, the internal gas gradually leaks out, and the gas volume decreases. Therefore, by setting a specific pressure range from -50 kPa to -20 kPa as the criterion, the pressure change, as an intuitive and quantifiable indicator, can accurately reflect whether the air bag is leaking.

[0035] The usage process of the above embodiments is as follows: Figures 1 to 2As shown, in the initial state, the preload of spring 34 keeps the pressing housing 32 and the fixed base 2 separated, and the limit contact 33 is disconnected, thus breaking the circuit. When the hand inserts the air bag tube 4 and applies force, the pressure is greater than the preload of spring 34, causing spring 34 to deform, pressing housing 32 to move axially, and limit contact 33 to contact, converting the mechanical displacement into an electrical signal and forming an electrical conduction circuit. The electrical conduction circuit triggers the vacuum pump, which draws air through the hose to the suction nozzle 31, creating a negative pressure environment inside the air bag by utilizing the gas flow characteristics. The time-delay relay locks the circuit when the contacts are briefly separated, maintaining a stable negative pressure. The pressure sensor acquires the air bag pressure data in real time, and based on the change in pressure from -50KPa to -20KPa, it accurately determines whether the air bag is leaking by utilizing the relationship between gas volume and pressure, realizing a complete process from mechanical operation to electrical control and then to pneumatic detection.

[0036] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A ring contact switch and getter leak detection integrated structure, characterized in that, The system includes a detection platform (1) and at least one set of ring-shaped contact switches disposed on the detection platform (1). The ring-shaped contact switches have the following structure: The fixed base (2) is hollow and columnar. One end of it is embedded in the interior of the detection platform (1) and connected to the vacuum pump through a hose. The other end of it is movably equipped with a switch body (3). The switch body (3) includes a cylindrical pressing housing (32), an air intake nozzle (31) located at the center of the pressing housing (32), and a spring (34) located inside the pressing housing (32). The air intake nozzle (31) extends inward along the center of the pressing housing (32) and passes through the fixed seat (2) and is connected to the hose. The spring (34) applies a preload to the pressing housing (32) so that there is a certain gap between the pressing housing (32) and the fixed seat (2). A silicone pad (35) is provided between the spring (34) and the fixed seat (2). A limit contact (33) is provided on the periphery of the pressing housing (32). The limit contact (33) includes a movable contact on the pressing housing (32) and a fixed contact installed on the fixed seat (2). The movable contact contacts or separates from the fixed contact as the pressing housing (32) moves, thereby controlling the start and stop of the vacuum pump.

2. The ring contact switch and getter leak detection integrated structure of claim 1, wherein, The cross-section of the pressing housing (32) is annular, and the air inlet (31) in the middle is inserted into the air bag tube (4). The insertion operation is performed manually by the operator. When the operator applies force forward naturally, the hand comes into contact with the pressing housing (32) and exerts a force on the pressing housing (32). The force is greater than the preload of the spring (34) inside the pressing housing (32), and the spring (34) undergoes elastic deformation.

3. The ring contact switch and getter leak detection integrated structure of claim 2, wherein, When the spring (34) deforms, the pressing housing (32) generates axial displacement, causing the limiting contacts (33) on the pressing housing (32) to come into contact with each other, forming an electrical conduction circuit; the vacuum pump of the electrical conduction circuit starts to run, and the suction nozzle (31) is controlled by the hose connected to the vacuum pump to draw air, so that a negative pressure environment is formed inside the air bag.

4. The ring contact switch and getter integrated structure according to claim 3, characterized in that, The electrical conduction circuit is also equipped with a time delay relay, which locks the electrical conduction circuit, allowing the vacuum pump to run continuously for a period of time, creating a sustained negative pressure inside the air bag.

5. The ring contact switch and getter integrated structure according to claim 3, characterized in that, The electrical conduction circuit is also equipped with a pressure sensor and a pressure gauge. The pressure sensor is connected to the access hose through a special connector, and the pressure gauge is installed above the ring contact switch of the detection platform (1).

6. The ring contact switch and getter integrated structure according to claim 5, wherein, The pressure value of the pressure gauge is adjusted from -50 kPa to -20 kPa to determine whether the bag is leaking.