Leak detection device for nasal oxygen cannula

Abstract

The utility model discloses a kind of nasal oxygen tube leak detection devices, including processing table, test table, flat belt conveyor and support. Test table front end is equipped with air inlet joint, and its lower part is connected with air outlet assembly. Air outlet assembly is composed of gas pipe, heating box, air outlet joint, temperature sensor, flow guide cover, gas uniform distribution plate and heating rod. Gas pipe is directly connected with the air pump inside test table, heating box is heated to the gas, and temperature sensor monitors airflow temperature. Support top is equipped with thermal imaging camera. The utility model passes through into constant-temperature gas to nasal oxygen tube, utilizes thermal imaging camera to capture leakage point temperature field change, realizes the quick, accurate and non-contact visual positioning of leakage position, solves the technical problem that traditional method cannot accurately position leakage point, significantly improves quality inspection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of nasal oxygen tube leak detection technology, specifically a nasal oxygen tube leak detection device. Background Technology

[0002] As a critical medical consumable, the airtightness of nasal oxygen cannulas is a core indicator for ensuring patients' safe oxygen intake. Leak detection of nasal oxygen cannulas is an essential quality control step during the production process.

[0003] Currently, the industry primarily employs two methods for leak detection in nasal oxygen tubes: The first is the traditional manual water inspection method, which involves immersing the tube in water after inflation and relying on the operator's visual inspection to determine if a leak has occurred. While simple, this method is entirely manual, inherently inefficient, labor-intensive, and prone to subjective errors, making it unsuitable for modern mass production. The second method is automated pressure decay detection, such as the nasal oxygen tube leak detection device disclosed in existing technology (CN222733785U). This device inflates the tube with an air pump and uses a pressure sensor to detect pressure changes during the pressure holding phase to determine product quality. This method improves automation, but the result is only a binary "qualified" or "unqualified" conclusion, unable to precisely pinpoint the leak location (e.g., whether it's the nasal plug, the flare opening, the pipe, or the joint). In the production process, accurately obtaining leak location information is crucial for quickly tracing production defects, optimizing process parameters, and improving mold design. This deficiency in existing technology means that even if quality inspectors discover defective products, they still need to spend a lot of time conducting secondary inspections to pinpoint the root cause of the problem, thus failing to fundamentally improve quality and efficiency.

[0004] Therefore, we propose a nasal oxygen cannula leak detection device. Utility Model Content

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a nasal oxygen tube leak detection device. By introducing a constant-temperature gas into the nasal oxygen tube and utilizing thermal imaging technology, it achieves rapid, accurate, and non-contact location of leak points. This solves the core problem of existing technologies, which can only determine whether a leak has occurred but cannot pinpoint the location of the leak, and can effectively address the issues in the background technology.

[0006] (II) Technical Solution To achieve the above objectives, the technical solution adopted by this utility model is as follows: a nasal oxygen tube leak detection device, including a processing table, a test platform installed at the rear end of the upper outer surface of the processing table, a flat belt conveyor installed in the middle of the upper surface of the processing table, an air inlet connector installed at the front end of the test platform, an air outlet assembly provided at the lower part of the air inlet connector, the air outlet assembly including an air supply pipe, a heating box, an air outlet connector, a temperature sensor, an air inlet guide hood, a gas distribution plate, a heating rod and an air outlet guide hood, a bracket fixedly installed on the side of the upper outer surface of the test platform near the air inlet connector, and a thermal imaging camera fixedly installed at the front end of the top of the bracket.

[0007] Preferably, the gas supply pipe is located below the gas inlet connector, and the rear end of the gas supply pipe is connected to the air pump inside the test bench; the gas inlet connector is used to discharge gas.

[0008] Preferably, the heating box is fixed to the outer surface of the front end of the gas supply pipe, the gas outlet connector is fixed to the middle of the outer surface of the front end of the heating box, and the heating box is internally connected to the gas supply pipe and the gas outlet connector.

[0009] Preferably, the temperature sensor is fixed on the upper outer surface of the air outlet connector, and the probe of the temperature sensor is located inside the air outlet connector. The air outlet guide hood is fixed on the front end of the heating chamber cavity, the air inlet guide hood is fixed on the rear end of the heating chamber cavity, and the air outlet guide hood is fixed on the rear outer surface of the air outlet connector. The air inlet guide hood is fixed on the front outer surface of the air supply pipe.

[0010] Preferably, the number of heating rods is multiple sets, and the multiple sets of heating rods are fixed inside the heating box, with the gas distribution plate located between the front end of the air inlet guide shroud and the rear end of the heating rods.

[0011] Preferably, the thermal imaging camera, temperature sensor, and heating rod are all connected to an external controller. The controller receives the temperature signal fed back by the temperature sensor and controls the start / stop or power of the heating rod according to the signal, so as to maintain the temperature of the gas flowing through the gas outlet joint within a preset range.

[0012] (III) Beneficial Effects Compared with the prior art, this utility model provides a nasal oxygen cannula leak detection device, which has the following beneficial effects: 1. This nasal oxygen tube leak detection device introduces gas at a constant temperature into the nasal oxygen tube. Any leak point will form a "hot spot" or "cold spot" with a different temperature than the background temperature of the tube due to the gas escaping. The thermal imaging camera can intuitively and clearly capture this tiny temperature difference and image it on the display screen in real time. The operator or image processing system can directly and accurately identify the specific location of the leak point (such as cracks in the nasal plug, holes in the tube, leaks at joints, etc.) from the thermal image. This solves the technical bottleneck of the traditional pressure attenuation method, which can only determine "whether there is a leak" but cannot tell "where the leak is". It provides crucial information for quality traceability and process improvement in the production process.

[0013] 2. This nasal cannula leak detection device addresses the traditional manual water inspection method, which relies on human visual judgment and is prone to misjudgment or missed detection due to visual fatigue. This invention utilizes thermal imaging cameras to acquire objective digital image data, which not only avoids human subjective error and improves detection accuracy, but also allows for the saving and recording of the detection image of each product, forming a complete quality database. This facilitates subsequent quality problem analysis, production batch traceability, and process optimization, realizing the data-driven and visualized management of quality. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a nasal oxygen tube leak detection device according to the present invention.

[0015] Figure 2 This is a schematic diagram of the support and thermal imaging camera in a nasal oxygen tube leak detection device according to the present invention.

[0016] Figure 3 This is a schematic diagram of the air outlet component in a nasal oxygen tube leak detection device according to this utility model.

[0017] Figure 4 This is a top cross-sectional view of the heating box in the nasal oxygen tube leak detection device of this utility model.

[0018] In the diagram: 1. Processing table; 2. Flat belt conveyor; 3. Test table; 4. Support frame; 5. Thermal imaging camera; 6. Air inlet connector; 7. Air outlet assembly; 8. Air delivery pipe; 9. Heating box; 10. Air outlet connector; 11. Temperature sensor; 12. Air inlet guide hood; 13. Gas distribution plate; 14. Heating rod; 15. Air outlet guide hood. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] This embodiment is a nasal oxygen tube leak detection device.

[0021] like Figures 1-4 As shown, the test platform includes a processing table 1, a test platform 3 is installed at the rear end of the upper outer surface of the processing table 1, a flat belt conveyor 2 is installed in the middle of the upper part of the processing table 1, an air inlet connector 6 is installed at the front end of the test platform 3, and an air outlet assembly 7 is provided at the lower part of the air inlet connector 6. The air outlet assembly 7 includes an air supply pipe 8, a heating box 9, an air outlet connector 10, a temperature sensor 11, an air inlet guide shroud 12, a gas distribution plate 13, a heating rod 14, and an air outlet guide shroud 15. A bracket 4 is fixedly installed on the side of the upper outer surface of the test platform 3 near the air inlet connector 6, and a thermal imaging camera 5 is fixedly installed at the front end of the top of the bracket 4.

[0022] The gas supply pipe 8 is located below the gas inlet connector 6, and its rear end is connected to the air pump inside the test bench 3. The gas inlet connector 6 is used to discharge gas. The heating box 9 is fixed to the outer surface of the front end of the gas supply pipe 8, and the gas outlet connector 10 is fixed to the middle of the outer surface of the front end of the heating box 9. The heating box 9 is internally connected to the gas supply pipe 8 and the gas outlet connector 10. The temperature sensor 11 is fixed to the outer surface of the upper end of the gas outlet connector 10, and the probe of the temperature sensor 11 is located inside the gas outlet connector 10. The gas outlet guide shroud 15 is fixed to the front end of the inner cavity of the heating box 9, and the gas inlet guide shroud 12 is fixed to the rear end of the inner cavity of the heating box 9. Furthermore, the exhaust guide 15 is fixed to the outer surface of the rear end of the exhaust connector 10, and the intake guide 12 is fixed to the outer surface of the front end of the gas supply pipe 8; there are multiple sets of heating rods 14, which are fixed inside the heating box 9, and the gas distribution plate 13 is located between the front end of the intake guide 12 and the rear end of the heating rods 14; the thermal imaging camera 5, the temperature sensor 11, and the heating rods 14 are all connected to an external controller. The controller receives the temperature signal fed back by the temperature sensor 11 and controls the start / stop or power of the heating rods 14 according to the signal so that the temperature of the gas flowing through the exhaust connector 10 is maintained within a preset range.

[0023] During operation, the operator quickly connects the inlet end of the nasal oxygen cannula to the outlet connector 10, and the other end to the inlet connector 6. The controller starts the air pump and heating rod 14. The compressed air generated by the air pump enters the heating chamber 9 through the air supply pipe 8. After passing through the inlet guide hood 12 for initial diffusion, the gas distribution plate 13 for uniform distribution, multiple sets of heating rods 14 for full heating, and the outlet guide hood 15 for convergence, a stable and constant-temperature hot airflow is formed. Finally, it is filled into the nasal oxygen cannula to be tested through the outlet connector 10. The temperature sensor 11 continuously monitors the airflow temperature and feeds the signal back to the controller. The controller maintains a constant temperature by adjusting the power of the heating rod 14.

[0024] The hot gas filling the nasal oxygen tube will escape from any existing leak point (such as cracks, holes, or unsealed connections). The temperature difference between the escaping gas and the surrounding environment causes a change in the temperature field distribution in that localized area. The thermal imaging camera 5, facing the testing station, captures this minute temperature difference in real time and generates a clear thermal image on its display screen. Bright "hot spots" or dim "cold spots" in the image (depending on the relative temperature of the ambient air and the gas) precisely correspond to the location of the leak. Operators can intuitively and quickly locate leaks by observing the thermal image, thus achieving non-contact, high-precision, and visual detection of nasal oxygen tube leaks.

[0025] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A nasal cannula leak detection device, comprising a processing table (1), a test platform (3) mounted on the rear end of the upper outer surface of the processing table (1), a flat belt conveyor (2) mounted on the middle of the upper end of the processing table (1), and an air inlet connector (6) mounted on the front end of the test platform (3), characterized in that: The lower part of the air inlet connector (6) is provided with an air outlet assembly (7), which includes an air supply pipe (8), a heating box (9), an air outlet connector (10), a temperature sensor (11), an air inlet guide shroud (12), a gas distribution plate (13), a heating rod (14), and an air outlet guide shroud (15). A bracket (4) is fixedly installed on the upper outer surface of the test bench (3) near the air inlet connector (6), and a thermal imaging camera (5) is fixedly installed at the front end of the top of the bracket (4).

2. The nasal cannula leak detection device according to claim 1, characterized in that: The gas supply pipe (8) is located below the gas inlet connector (6), and the rear end of the gas supply pipe (8) is connected to the gas pump inside the test bench (3); the gas inlet connector (6) is used to export gas.

3. The nasal cannula leak detection device according to claim 2, characterized in that: The heating box (9) is fixed on the outer surface of the front end of the gas supply pipe (8), and the gas outlet connector (10) is fixed in the middle of the outer surface of the front end of the heating box (9). The heating box (9) is connected to the interior of the gas supply pipe (8) and the gas outlet connector (10).

4. A nasal cannula leak detection device according to claim 3, characterized in that: The temperature sensor (11) is fixed on the upper outer surface of the air outlet connector (10), and the probe of the temperature sensor (11) is located inside the air outlet connector (10). The air outlet guide hood (15) is fixed at the front end of the inner cavity of the heating box (9). The air inlet guide hood (12) is fixed at the rear end of the inner cavity of the heating box (9). The air outlet guide hood (15) is fixed on the rear outer surface of the air outlet connector (10), and the air inlet guide hood (12) is fixed on the front outer surface of the air supply pipe (8).

5. A nasal cannula leak detection device according to claim 4, characterized in that: The number of heating rods (14) is multiple sets, and the multiple sets of heating rods (14) are fixed inside the heating box (9). The gas distribution plate (13) is located between the front end of the air inlet guide shroud (12) and the rear end of the heating rods (14).

6. A nasal cannula leak detection device according to claim 5, characterized in that: The thermal imaging camera (5), temperature sensor (11) and heating rod (14) are all connected to an external controller. The controller receives the temperature signal fed back by the temperature sensor (11) and controls the start / stop or power of the heating rod (14) according to the signal so that the temperature of the gas flowing through the gas outlet (10) is maintained within a preset range.

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