Leakage detection system for disposable bag

Abstract

The utility model relates to the field of medical instruments and food package detection, in particular to a leak detection system for disposable bags. The utility model provides a leak detection system for a disposable bag. The leak detection system comprises a closed cavity, a gas path system, a gas concentration sensor and a control system. The system can realize high-precision leak detection, avoids damage to disposable bags, and has high efficiency and high automation degree. The disposable bag leak detection device improves the leak detection precision and efficiency of disposable bags, and has certain significance in improving the product quality in the fields of medical instruments, food packaging and the like.

Description

Technical Field

[0001] The utility model relates to the fields of medical devices and food packaging detection, and particularly relates to a leak detection system for disposable bags. Background Art

[0002] Disposable bags are widely used in the fields of medicine, food, etc. Their sealing performance is directly related to the quality and safety of products. Therefore, it is crucial to effectively detect the sealing performance of disposable bags.

[0003] Currently, the common leak detection methods for disposable bags include visual inspection, water immersion method, pressure decay method, etc. The visual inspection method is simple to operate, but it is highly subjective and difficult to detect tiny leaks. Although the water immersion method can directly observe the leak location, it is easy to contaminate the item to be tested and has low detection efficiency. The pressure decay method determines the leak situation by monitoring the pressure change in a closed container, but it is sensitive to environmental temperature changes and is easily interfered by the outside world, affecting the detection accuracy.

[0004] The common problems of these traditional methods are low detection accuracy and difficulty in detecting tiny leaks. At the same time, the disposable bags may be damaged during the detection process, affecting subsequent use. In addition, these methods have low automation, cumbersome operations, and low detection efficiency, making it difficult to meet the quality control requirements in large-scale production. Summary of the Utility Model

[0005] The utility model provides a leak detection system for disposable bags, aiming to accurately and efficiently detect the integrity of disposable bags:

[0006] To achieve the above purpose, the utility model provides a leak detection system for disposable bags, including:

[0007] A sealed cavity for accommodating the disposable bag to be tested; a gas processing system connected to the sealed cavity and the disposable bag for adjusting the gas state of the sealed cavity and the disposable bag; a gas concentration detection system for detecting the gas concentration in the sealed cavity; a control system connected to the gas processing system and the gas concentration detection system for controlling the detection process and evaluating the sealing performance of the disposable bag according to the change in the concentration of the marker gas in the leak detection system.

[0008] Further, the gas processing system includes: a first gas path connected to the sealed cavity for supplying gas to the sealed cavity; a second gas path passing through the sealed cavity and connected to the disposable bag for supplying gas to the disposable bag; a differential pressure control unit provided on the sealed cavity and communicating with its interior for controlling the internal and external differential pressure of the sealed cavity; a vacuum unit connected to the sealed cavity for evacuating the sealed cavity.

[0009] Specifically, the first gas path includes: an air inlet pipe for leak detection system, one end of which is connected to a gas source and the other end is communicated with the sealed cavity; a first switch control valve disposed on the air inlet pipe for leak detection system; a first pressure regulating valve disposed on the air inlet pipe for leak detection system, downstream of the first switch control valve; a first solenoid valve disposed on the air inlet pipe for leak detection system, downstream of the first pressure regulating valve; and a first flow regulating valve disposed on the air inlet pipe for leak detection system, downstream of the first solenoid valve.

[0010] Further, the second gas path includes: an air inlet pipe for disposable bag, one end of which is connected to a gas source and the other end passes through the sealed cavity and is communicated with the disposable bag; a second switch control valve disposed on the air inlet pipe for disposable bag; a second pressure regulating valve disposed on the air inlet pipe for disposable bag, downstream of the second switch control valve; a third solenoid valve disposed on the air inlet pipe for disposable bag, downstream of the second pressure regulating valve; and a second flow regulating valve disposed on the air inlet pipe for disposable bag, downstream of the third solenoid valve.

[0011] Specifically, the differential pressure control unit includes: a differential pressure sensor disposed in the sealed cavity; an air outlet pipe for leak detection system, communicated with the sealed cavity; and a second solenoid valve disposed on the air outlet pipe for leak detection system.

[0012] Further, the system further includes a monitoring unit, and the monitoring unit includes: a pressure transmitter connected to the first gas path for monitoring the pressure of the first gas path; an air flow meter connected to the second gas path for detecting the gas flow rate of the second gas path; and a differential pressure transmitter connected to the disposable bag for monitoring the internal and external differential pressure inside the disposable bag.

[0013] Specifically, the system further includes: a non-signature gas source connected to the first gas path for supplying gas to the sealed cavity; and a signature gas source connected to the second gas path for supplying gas to the disposable bag.

[0014] Further, the system further includes a fan disposed in the sealed cavity for providing power for the gas circulation in the sealed cavity to promote the uniform distribution of the gas in the sealed cavity.

[0015] Compared with the prior art, the utility model has at least the following beneficial effects: The leak detection system for disposable bags provided by the utility model can accurately detect the integrity of disposable bags through the cooperation of a sealed cavity, a gas treatment system, a gas concentration detection system, and a control system. At the same time, by setting up the gas treatment system, the gas concentration detection system, and the control system, the automation and standardization of the leak detection process are realized. Components such as the vacuum unit, differential pressure control unit, and fan in the system further improve the detection accuracy and efficiency. In addition, the system also includes a monitoring unit that can accurately monitor the gas path state and the volume change of the disposable bag, providing a basis for the accurate calculation of the leakage amount. Generally speaking, the system of the utility model can improve the leak detection efficiency and accuracy of disposable bags, which has certain significance for improving the quality control level of disposable bags. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a leak detection system for disposable bags in an embodiment of the utility model.

[0017] In the figure: 1, sealed cavity; 2, disposable bag; 3, fan; 4, differential pressure sensor; 5, gas concentration sensor; 6, left sealing door of the leak detection system; 7, right sealing door of the leak detection system; 8, control system; 9, non-marking gas gas source; 10, inlet pipe of the leak detection system; 11, first switch control valve; 12, first pressure regulating valve; 13, first solenoid valve; 14, first flow regulating valve; 15, pressure transmitter; 16, outlet air pipe of the leak detection system; 17, second solenoid valve; 18, vacuum pump; 19, marking gas gas source; 20, inlet pipe of the disposable bag; 21, second switch control valve; 22, second pressure regulating valve; 23, third solenoid valve; 24, second flow regulating valve; 25, air flow meter; 26, differential pressure transmitter; 27, outlet pipe of the disposable bag; 28, fourth solenoid valve. Detailed Embodiments

[0018] The following combines the drawings and specific embodiments to elaborate on the technical solutions of the utility model in detail. It should be noted that the described embodiments are only used to explain the technical principle of the utility model, rather than limiting the scope of its patent protection. Those skilled in the art should understand that without departing from the spirit and scope of the utility model, various transformations, modifications, or equivalent replacements can be made to these embodiments. These transformations, modifications, or equivalent replacements should all be regarded as falling within the protection scope defined by the claims of the utility model patent. The detailed embodiments of the utility model have been described by examples. However, it should be understood that the described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts fall within the protection scope of the utility model.

[0019] This embodiment provides a leak detection system for disposable bags. As Figure 1 shown, the system includes a sealed cavity 1, a gas processing system, a gas concentration detection system, and a control system 8.

[0020] The sealed cavity 1 is used to accommodate the disposable bag 2 to be tested. The sealed cavity 1 includes a left sealing door 6 and a right sealing door 7 of the leak detection system for sealing the sealed cavity 1.

[0021] The gas processing system is connected to the sealed cavity 1 and the disposable bag 2 for adjusting the gas state of the sealed cavity 1 and the disposable bag 2. The gas processing system includes a first gas path, a second gas path, a differential pressure control unit, and a vacuum unit 18.

[0022] The first gas path is connected to the sealed cavity 1 for supplying gas to the sealed cavity 1. The first gas path includes an inlet pipe 10 of the leak detection system, one end of which is connected to a gas source and the other end is connected to the sealed cavity 1; a first switch control valve 11 provided on the inlet pipe 10 of the leak detection system; a first pressure regulating valve 12 provided on the inlet pipe 10 of the leak detection system and located downstream of the first switch control valve 11; a first solenoid valve 13 provided on the inlet pipe 10 of the leak detection system and located downstream of the first pressure regulating valve 12; a first flow regulating valve 14 provided on the inlet pipe 10 of the leak detection system and located downstream of the first solenoid valve 13.

[0023] The second gas path passes through the sealed cavity 1 and is connected to the disposable bag 2 for supplying gas to the disposable bag 2. The second gas path includes an inlet pipe 20 of the disposable bag, one end of which is connected to a gas source and the other end passes through the sealed cavity 1 and is connected to the disposable bag 2; a second switch control valve 21 provided on the inlet pipe 20 of the disposable bag; a second pressure regulating valve 22 provided on the inlet pipe 20 of the disposable bag and located downstream of the second switch control valve 21; a third solenoid valve 23 provided on the inlet pipe 20 of the disposable bag and located downstream of the second pressure regulating valve 22; a second flow regulating valve 24 provided on the inlet pipe 20 of the disposable bag and located downstream of the third solenoid valve 23.

[0024] The differential pressure control unit is provided on the sealed cavity 1 and is in internal communication with it for controlling the internal and external differential pressure of the sealed cavity 1. The differential pressure control unit includes a differential pressure sensor 4 provided inside the sealed cavity 1; an outlet air pipe 16 of the leak detection system connected to the sealed cavity 1; and a second solenoid valve 17 provided on the outlet air pipe 16 of the leak detection system.

[0025] The vacuum unit 18 includes a vacuum pump, which is connected to the sealed cavity 1 and used to evacuate the sealed cavity 1.

[0026] The gas concentration detection system is used to detect the gas concentration in the sealed cavity 1, and includes a gas concentration sensor 5 arranged in the sealed cavity 1.

[0027] The control system 8 is connected to the gas treatment system and the gas concentration detection system, and is used to control the detection process.

[0028] In addition, the system further includes a monitoring unit. The monitoring unit includes a pressure transmitter 15, which is connected to the first gas path and used to monitor the pressure of the first gas path; an air flow meter 25, which is connected to the second gas path and used to detect the gas flow of the second gas path; and a differential pressure transmitter 26, which is connected to the disposable bag 2 and used to monitor the differential pressure inside the disposable bag 2.

[0029] The system further includes a non - signature gas source 9, which is connected to the first gas path and used to supply gas to the sealed cavity 1; and a signature gas source 19, which is connected to the second gas path and used to supply gas to the disposable bag 2.

[0030] In order to promote the uniform distribution of gas in the sealed cavity 1, the system further includes a fan 3, which is arranged in the sealed cavity 1. In a preferred embodiment, the fan 3 can be a turbulent flow fan, and this type of fan is beneficial to realizing the uniform distribution of gas in the sealed cavity.

[0031] Operation instructions and working principle:

[0032] 1. Open the left sealing door 6 and the right sealing door 7 of the leak detection system, put the disposable bag 2 into the leak detection system 1, and then close the left sealing door 6 and the right sealing door 7 of the leak detection system.

[0033] 2. Control the opening of the second solenoid valve 17 and the vacuum pump 18 through the control system 8, conduct the air outlet pipe 16 of the leak detection system, evacuate the leak detection system 1 through the air outlet pipe 16 of the leak detection system to the first differential pressure. When the differential pressure sensor 4 integrated on the leak detection system 1 detects that the differential pressure of the leak detection system reaches the first differential pressure, the control system 8 controls the second solenoid valve 17 and the vacuum pump 18 to close.

[0034] 3. Open the first switch control valve 11 and the first solenoid valve 13. The non - signature gas 9 enters the leak detection system 1 through the air inlet pipe 10 of the leak detection system. When the differential pressure sensor 4 inside the cavity of the leak detection system 1 detects the second differential pressure, the first solenoid valve 13 closes to stop inflating the leak detection system 1.

[0035] 4. The gas concentration sensor 5 of the leak detection system synchronously detects the gas concentration inside the leak detection system. If the gas concentration is higher than the set value, after the vacuum pump 18 repeats pumping to create a vacuum, the second solenoid valve 17 is opened to fill the leak detection system 1 with gas until the second pressure difference is reached, until the gas concentration sensor 5 of the leak detection system detects that the calibrated gas concentration value ≤ the calibrated gas set value.

[0036] 5. Open the second switch control valve 21 and the third solenoid valve 23 to inflate the disposable bag 2. When the differential pressure transmitter 26 detects that the fourth pressure difference ≥ the fourth pressure difference set value, stop inflating.

[0037] 6. During the inflation process of the disposable bag 2, the differential pressure sensor 4 in the leak detection system 1 detects in real time, and the control system 8 controls the second solenoid valve 17 to be in the air release position to release air, so that the pressure difference in the leak detection system 1 is maintained within the third pressure difference set range.

[0038] 7. Close the first solenoid valve 13, the second solenoid valve 17, the third solenoid valve 23, and the fourth solenoid valve 28, and keep the leak detection system 1 pressurized for the set duration.

[0039] 8. Check the comparison between the concentration value displayed by the gas concentration sensor 5 of the leak detection system and the target concentration value of the calibrated gas. When the concentration value displayed by the gas concentration sensor 5 of the leak detection system > the target concentration value of the calibrated gas, it is judged that the integrity test of the disposable bag is unqualified; when the actual concentration value of the calibrated gas displayed by the gas concentration sensor 5 of the leak detection system ≤ the target concentration value of the calibrated gas, it is judged that the integrity test of the disposable bag is qualified.

[0040] Through this system, high-precision and non-destructive leak detection of the disposable bag can be achieved. The system has a high degree of automation, is easy to operate, and the detection results are accurate and reliable. The accuracy of the gas concentration sensor 5 is not less than 0.1%, ensuring accurate detection of minute leaks. At the same time, by controlling the pressure difference between the disposable bag 2 and the sealed cavity 1, and using the fan 3 to promote uniform gas distribution, the accuracy and reliability of the detection are further improved.

[0041] The leak detection system for the disposable bag provided by the present utility model has the following beneficial effects:

[0042] This system determines the tightness of the disposable bag by filling different gases into the leak detection system and the disposable bag respectively, and monitoring the change in the concentration of the second gas in the leak detection system, achieving high-precision leak detection. This system avoids direct operation on the disposable bag, reducing the risk of damage to the disposable bag. By controlling the pressure difference inside and outside the disposable bag, the accuracy and reliability of the detection are ensured. The system is reasonably designed and easy to operate, realizing the automation and standardization of the leak detection process. The settings of components such as the vacuum pump, differential pressure sensor, and fan further improve the detection accuracy and efficiency. The use of the gas flowmeter makes the calculation of the volume of the disposable bag more accurate, providing a basis for the accurate calculation of the leakage amount.

[0043] This system can detect tiny leaks, improving the quality control level of disposable bags. By precisely controlling the gas concentration and pressure, the influence of environmental factors on the detection results is reduced. The system has a high degree of automation, reducing human operation errors and improving the consistency and repeatability of detection. Overall, the system of the present utility model significantly improves the leak detection efficiency and accuracy of disposable bags, which is of great significance for improving the product quality in fields such as medical devices and food packaging.

[0044] The present utility model has been described in detail through the above specific embodiments. However, it should be understood that the above content is only illustrative and not used to limit the scope of the present utility model. Those of ordinary skill in the art can make various modifications and variations to the present utility model according to the specific application scenarios and actual needs without departing from the spirit and scope of the present utility model, and these modifications and variations are within the protection scope of the present utility model.

Claims

1. A leak detection system for disposable bags, characterized in that: include: A sealed cavity (1) for accommodating a disposable bag to be tested (2); a gas processing system, connected to the sealed cavity (1) and the disposable bag (2), and used for adjusting the gas state of the sealed cavity (1) and the disposable bag (2); A gas concentration detection system, used for detecting the gas concentration in the sealed cavity (1); A control system (8) is connected to the gas processing system and the gas concentration detection system, and is used to control the detection process and evaluate the sealing performance of the disposable bag according to the concentration change of the marker gas in the leak detection system.

2. The system according to claim 1, characterized in that The gas processing system comprises: A first gas path, connected to the sealed cavity (1), and used for supplying gas to the sealed cavity (1); A second air path, passing through the sealed cavity (1) and communicating with the disposable bag (2), for supplying air to the disposable bag (2); A pressure difference control unit, arranged on the sealed cavity (1) and in communication with the interior thereof, and used for controlling the pressure difference between the inside and outside of the sealed cavity (1); A vacuum unit (18) is communicated with the sealed cavity (1) and is used to evacuate the sealed cavity (1).

3. The system according to claim 2, characterized in that The first gas path comprises: An air inlet pipe (10) of the leak detection system, one end of which is connected to the air source and the other end of which is in communication with the sealed cavity (1); A first switch control valve (11) is arranged on the air inlet pipe (10) of the leak detection system; A first pressure regulating valve (12) is arranged on the air inlet pipe (10) of the leak detection system and is located downstream of the first switch control valve (11); A first solenoid valve (13) is arranged on the air inlet pipe (10) of the leak detection system and is located downstream of the first pressure regulating valve (12); A first flow regulating valve (14) is arranged on the air inlet pipe (10) of the leak detection system and is located downstream of the first solenoid valve (13).

4. The system according to claim 2, characterized in that The second gas path comprises: A disposable bag air inlet pipe (20), one end of which is connected to the air source, and the other end of which passes through the sealed cavity (1) and is in communication with the disposable bag (2); A second switch control valve (21), arranged on the disposable bag air inlet pipe (20); A second pressure regulating valve (22), arranged on the disposable bag air inlet pipe (20), and located downstream of the second switch control valve (21); a third solenoid valve (23), arranged on the disposable bag air inlet pipe (20) and located downstream of the second pressure regulating valve (22); The second flow regulating valve (24) is arranged on the disposable bag air inlet pipe (20) and is located downstream of the third solenoid valve (23).

5. The system according to claim 2, characterized in that The pressure difference control unit comprises: A differential pressure sensor (4) is arranged in the sealed cavity (1); An air outlet pipe (16) of the leak detection system is connected to the sealed cavity (1); The second solenoid valve (17) is arranged on the air outlet pipe (16) of the leak detection system.

6. The system according to claim 2, characterized in that Also included is a monitoring unit, the monitoring unit comprising: a pressure transmitter (15), connected to the first gas circuit, and used to monitor the pressure of the first gas circuit; an air flow meter (25), connected to the second gas path, and used to detect the gas flow of the second gas path; A pressure differential transmitter (26) is connected to the disposable bag (2) and is used to monitor the pressure differential between the inside and outside of the disposable bag (2).

7. The system according to claim 2, characterized in that Also includes: a non-signature gas source (9), connected to the first gas path, and used for supplying gas to the sealed cavity (1); A signature gas source (19) is connected to the second gas path and is used to supply gas to the disposable bag (2).

8. The system according to claim 1, characterized in that Also includes: The fan (3) is arranged in the sealed cavity (1) and is used to provide power for the gas circulation in the sealed cavity (1) to promote the uniform distribution of the gas in the sealed cavity (1).

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