Plugging and leakage detecting structure and method

Abstract

The application relates to a blockage and leakage detection structure, which comprises an air inlet channel assembly, a detection channel, a float and a detection assembly. The float is located in the detection channel. Detection gas passes through the product to be detected from the air inlet channel assembly into the detection channel. The float moves along the detection channel under the action of the detection gas. The detection assembly detects the moving speed of the float in the detection channel to judge the blockage or leakage condition of the product to be detected. The blockage and leakage detection structure can accurately detect the blockage and leakage degree of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to a detection structure, in particular to a clogging and leakage detection structure and a clogging and leakage detection method. BACKGROUND

[0002] For medical instrument products, whether the pipeline of the product is clogged or leaked is crucial to the performance of the product. Clogging and leakage detection can be detected by using the same detection structure. For the existing clogging and leakage detection structure of medical instrument products, the air pressure at the air inlet end of the product is detected after blowing air at the air inlet end to determine whether the product is clogged. If the air pressure at the air inlet end decreases or decreases slowly, it means that the product is clogged. However, this detection method can only detect the existence of clogging or most of the aperture clogging, and there is no way to detect a small amount of clogging. If the air pressure change rate of the air inlet section is used to determine the clogging condition of the product, the air pressure change rate of the air inlet end is fast first and then slow for a specific clogging condition, resulting in that the air pressure change rate is not constant, which leads to that the air pressure change rate and the clogging condition do not present a complete correlation, so it is difficult to intuitively determine the clogging condition according to the air pressure change rate. Another detection scheme is to place a sensor at the air outlet end of the product, and then blow air at the air inlet end. If the sensor does not detect gas, it means that the product is clogged. However, this detection method still cannot detect the case of a small amount of clogging. Therefore, it is necessary to provide an effective clogging and leakage detection scheme, which can accurately determine the degree of clogging and leakage. SUMMARY

[0003] Therefore, it is necessary to provide an improved clogging and leakage detection structure and a clogging and leakage detection method, which can accurately detect the degree of clogging and leakage of the product.

[0004] The present application first provides a clogging and leakage detection structure, which comprises an air inlet channel assembly, a detection channel, a float and a detection assembly. The float is located in the detection channel, and detection gas enters the detection channel from the air inlet channel assembly through the product to be detected. The float moves along the detection channel under the action of the detection gas, and the detection assembly detects the moving speed of the float in the detection channel to determine the clogging or leakage condition of the product to be detected.

[0005] By adopting the technical scheme, when the product to be detected is blocked, the less the product to be detected is blocked, the more unobstructed the product to be detected is, and the greater the air pressure after the detection gas passes through the product to be detected. Similarly, when the product to be detected leaks, the less the product to be detected leaks, the more sealed the product to be detected is, and the greater the air pressure after the detection gas passes through the product to be detected. The detection gas after passing through the product to be detected acts on the float, so the greater the air pressure after the detection gas passes through the product to be detected, the faster the moving speed of the float in the detection channel under the action of the detection gas. Therefore, whether the product to be detected is blocked or leaks, the blocking or leaking condition is related to the moving speed of the float. Therefore, the moving speed of the float can be used to not only judge whether the product to be detected is blocked or leaks, but also judge the degree of blocking or leaking of the product to be detected.

[0006] In an embodiment of the application, the detection channel comprises an air inlet and an air outlet, the moving range of the float is located between the air inlet and the air outlet, the air inlet is used for the detection gas to enter the detection channel, and the air outlet is used for the gas between the air outlet and the float to leave the detection channel.

[0007] By adopting the technical scheme, if the air outlet is not provided, the detection gas enters the detection channel and acts on the float, so that the float moves in the detection channel. At this time, the space of the detection channel located on the side of the float away from the air inlet gradually decreases with the movement of the float, so that the internal air pressure begins to increase. This part of air pressure acts on the float and becomes the resistance to the movement of the float, thereby affecting the detection result of the detection assembly on the float. Therefore, the provision of the air outlet makes the gas in the detection channel located on the side of the float away from the air inlet be discharged to the outside with the movement of the float, thereby avoiding the movement of the float being hindered, so that the detection result of the detection assembly on the float is more accurate.

[0008] In an embodiment of the application, the inner wall of the detection channel is in a circumferential gap fit with the float.

[0009] By adopting the above technical solution, if the inner wall of the detection channel abuts against the float axially, the inner wall of the detection channel will generate frictional resistance to the float as it moves along the detection channel under the action of the detection gas, thus affecting the detection results of the detection assembly. However, if the inner wall of the detection channel is in circumferential fit with the float, the detection gas will not only act on the float to move it within the detection channel but also enter the gap between the float and the inner wall of the detection channel. This changes the resistance the float experiences from the inner wall of the detection channel to the resistance of the detection gas. The resistance of the detection gas is naturally much smaller than the resistance of the inner wall of the detection channel, thus enabling the detection gas to act as a lubricant. Furthermore, since the detection gas moves in the same direction as the float, the resistance exerted by the detection gas on the float is even smaller. Therefore, the circumferential fit between the inner wall of the detection channel and the float significantly reduces the resistance experienced by the float during its movement, thereby improving the accuracy of the detection results of the detection assembly.

[0010] In one embodiment of the present invention, there is an angle α between the extension direction and the vertical direction of the detection channel, where 0 ≤ α ≤ 30°.

[0011] By adopting the above technical solution, the extension direction of the detection channel is approximately vertical, allowing the float to reset under its own weight after detection, thereby reducing costs and simplifying the structure. If α > 30°, during reset, the float will abut against the inner wall of the detection channel under its own weight. This inner wall will generate resistance that prevents the float from resetting under its own weight, and this resistance may even be sufficient to prevent the float from resetting automatically.

[0012] In one embodiment of the present invention, the plugging and leak detection structure further includes a reset channel, which is connected to the detection channel. Reset gas is introduced into the detection channel from the reset channel, and the float moves in the opposite direction along the detection channel under the action of the reset gas.

[0013] By adopting the above technical solution, regardless of how the detection channel is set, the float will be reset under the action of the reset gas, thereby expanding the applicable range of the plug and leak detection structure.

[0014] In one embodiment of the invention, the detection component includes a sensor that detects the time required for the float to move a preset distance along the detection channel.

[0015] By employing the above technical solutions, detecting the float's movement speed within the detection channel involves two methods: one is detecting the length of the detection channel traversed by the float within a fixed time period, and the other is detecting the time required for the float to travel a preset distance. However, detecting the length of the detection channel traversed within a fixed time period requires the sensor to accurately determine the float's position. In this case, either sensors must be deployed along the detection channel to detect the float's position within the fixed time period, thus allowing for the calculation of the channel's length, or the distance between the sensor and the float must be measured, which requires high sensor accuracy. Alternatively, a scale can be set on the detection channel, and the length of the channel traversed by the float within a fixed time period can be determined by taking a photograph. Therefore, detecting the length of the detection channel traversed by the float within a fixed time period is more costly, while detecting the time required for the float to travel a preset distance requires lower sensor accuracy and only requires a minimum of two sensors.

[0016] In one embodiment of the present invention, a plurality of sensors are provided, and the plurality of sensors are distributed along a preset distance interval on the detection channel.

[0017] In one embodiment of the present invention, the air intake channel assembly includes a first seal and a second seal, the first seal and the second seal respectively sealingly connecting the two ends of the product under test, the two ends of the first seal respectively sealingly connecting the gas supply device for providing detection gas and the product under test, and the two ends of the second seal respectively sealingly connecting the product under test and the detection channel.

[0018] The present invention also provides a method for detecting blockages and leaks, comprising the following steps: controlling a detection gas to flow sequentially through the product to be tested and a float, and detecting the moving speed of the float under the action of the detection gas to determine the blockage or leakage of the product to be tested.

[0019] In one embodiment of the present invention, the speed of the float under the action of the detection gas is determined by detecting the time it takes for the float to pass two detection points at a preset distance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the plugging and leak detection structure in the front view of an embodiment of the present invention;

[0021] Figure 2 This is a side view schematic diagram of the plugging and leak detection structure in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the detection channel in the plugging and leak detection structure in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the plugging and leak detection structure in the rear view of an embodiment of the present invention.

[0024] Reference numerals: 100, air intake channel assembly; 110, first seal; 120, second seal; 130, first drive component; 140, second drive component; 200, detection channel; 210, air inlet; 220, air outlet; 230, adjustment component; 300, detection assembly; 400, float; 500, product under test; 600, carrier. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Embodiments of the present invention first provide, as follows Figures 1-4 The structure shown includes an air intake channel assembly 100, a detection channel 200, a detection component 300, and a float 400.

[0029] Reference Figure 1 and Figure 2The air intake channel assembly 100 includes a first seal 110, a second seal 120, a first drive 130, and a second drive 140. The first drive 130 drives the first seal 110 to move toward or away from the second seal 120, and the second drive 140 drives the second seal 120 to move toward or away from the second seal 120. During testing, the product under test 500 is first placed on the carrier 600, and then the product under test 500 moves with the carrier 600 between the first seal 110 and the second seal 120. In some embodiments, the plugging and leak testing structure also includes a positioning element. After the carrier 600 moves between the first seal 110 and the second seal 120, the positioning element clamps the carrier 600 to fix its position. The first seal 110 and the second seal 120 move toward each other to seal the two ends connecting the product under test 500, respectively. One end of the first seal 110 is connected to the product under test 500, and the other end is connected to a gas supply device that provides the detection gas. The detection gas can be a non-toxic or harmless gas, such as air, nitrogen, oxygen, or an inert gas. For cost reduction, air is preferred. One end of the second seal 120 is connected to the product under test 500, and the other end is connected to the detection channel 200. To prevent the first seal 110 from disconnecting from the gas supply device during movement and the second seal 120 from disconnecting from the detection channel 200 during movement, the first seal 110 and the gas supply device are sealed together via a flexible hose, and the second seal 120 and the detection channel 200 are sealed together via a flexible hose. In some embodiments, when the first seal 110 and the second seal 120 are located below and above the product under test 500, respectively, the second drive member 140 is omitted while the first drive member 130 is retained. Driven by the first driving member 130, the first sealing member 110 and the product under test 500 abut against each other, causing the product under test 500 to move upward relative to the carrier 600 until it abuts against the second sealing member 120, thereby achieving a sealing connection between the two ends of the product under test 500 by the first sealing member 110 and the second sealing member 120. After the test is completed, the first sealing member 110 is reset under the drive of the first driving member 130, so that the product under test 500 returns to the carrier 600 under its own gravity.

[0030] Reference Figure 3The detection channel 200 includes an air inlet 210 and an air outlet 220. A float 400 is located within the detection channel 200 and can move along it. The float 400's range of movement within the detection channel 200 is between the air inlet 210 and the air outlet 220. The air inlet 210 is sealed in communication with a second seal 120, allowing detection gas to enter the detection channel 200 from the air inlet 210. The air outlet 220 is used for the gas between the air outlet 220 and the float 400 to exit the detection channel 200. In some embodiments, the air outlet 220 is provided with a regulating element 230 for controlling the speed at which the gas exits the detection channel 200 between the air outlet 220 and the float 400. Specifically, the regulating element 230 can be one of a speed control valve, an exhaust valve, a needle valve, or a shut-off valve. If the vent 220 is not provided, the detection gas enters the detection channel 200 and acts on the float 400, causing the float 400 to move within the detection channel 200. At this time, the space in the detection channel 200 on the side of the float 400 away from the vent 210 gradually decreases as the float 400 moves, causing the internal air pressure to continuously increase. This air pressure acts on the float 400, becoming a resistance that hinders its movement, thus affecting the detection result of the detection component 300. Therefore, the vent 220 allows the gas inside the detection channel 200 on the side of the float 400 away from the vent 210 to be discharged to the outside as the float 400 moves, thus preventing obstruction of the float 400's movement and ensuring a more accurate detection result from the detection component 300. Figure 1 In the specific embodiment shown, the air inlet 210 is located at one end of the detection channel 200, and the air outlet 220 is located at the other end of the detection channel 200. The detection gas passes sequentially through the first seal 110, the product to be tested 500, and the second seal 120 before entering the detection channel 200. The detection gas entering the detection channel 200 acts on the float 400, causing the float 400 to move within the detection channel 200. The detection channel 200 is made of transparent plastic, and there is an angle d between the extension direction and the vertical direction of the detection channel 200, where 0 ≤ α ≤ 30°. Preferably, α is 0, 5°, 10°, 15°, 20°, or 30°. Figure 1In the specific embodiment shown, α = 0, thus allowing the detection channel 200 to guide the float 400 to move vertically under the action of the detection gas. The extension direction of the detection channel 200 is approximately vertical, allowing the float 400 to reset under its own weight after detection, thereby reducing costs and simplifying the structure. If α > 30°, during reset, the float 400 will abut against the inner wall of the detection channel 200 under its own weight. This inner wall of the detection channel 200 will generate resistance that prevents the float 400 from resetting under its own weight, and this resistance may even be sufficient to prevent the float 400 from resetting under its own weight, causing the float 400 to fail to reset automatically. The inner wall of the detection channel 200 and the float 400 are fitted with a clearance in the circumferential direction. If the inner wall of the detection channel 200 abuts against the float 400 axially, the float 400 will experience frictional resistance as it moves along the detection channel 200 under the action of the detection gas, thus affecting the detection result of the detection assembly 300. However, if the inner wall of the detection channel 200 has a clearance fit with the float 400 circumferentially, the detection gas will not only act on the float 400 to move it within the detection channel 200 but will also enter the gap between the float 400 and the inner wall of the detection channel 200. This changes the resistance of the float 400 from the inner wall of the detection channel 200 to the resistance of the detection gas. The resistance of the detection gas is naturally much smaller than the resistance of the inner wall of the detection channel 200, thus allowing the detection gas to act as a lubricant. Furthermore, since the detection gas moves in the same direction as the float 400, the resistance exerted by the detection gas on the float 400 is even smaller. Therefore, the inner wall of the detection channel 200 is fitted with the float 400 in the circumferential direction, which greatly reduces the resistance encountered by the float 400 during its movement, thereby improving the accuracy of the detection results of the detection component 300 on the float 400.

[0031] Reference Figure 1 and Figure 4 The detection component 300 includes multiple sensors, which are spaced apart outside the detection channel 200. The types of sensors can be proximity sensors, photoelectric sensors, magnetic switches, etc. Figure 1In the specific embodiment shown, two sensors are provided, one of which is located near the air inlet 210. The distance between the sensor near the air inlet 210 and the air inlet 210 is d, and the distance between the air inlet 210 and the air outlet 220 is D, where 0 ≤ d / D ≤ 0.3. Specifically, d / D can be 0, 0.1, 0.2, or 0.3. The other sensor is located at a distance L from the air inlet 210, where 0.1 ≤ L / D ≤ ​​0.9. Specifically, L / D can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9. Compared to the case where one sensor is near the air inlet 210 and the other is near the air outlet 220, the distribution range of the sensors in the detection component 300 is concentrated in the initial movement phase of the float 400 within the detection channel 200. Furthermore, the linear correlation between the moving speed of the float 400 and the blockage or leakage status of the float 400 is stronger during this initial movement phase. The distance between the two sensors is determined according to a preset distance. The detection component 300 determines the moving speed of the float 400 under the action of the detection gas by detecting the time required for the float 400 to move from one sensor to another within the detection channel 200, thereby determining the blockage or leakage of the product under test 500. Detecting the moving speed of the float 400 within the detection channel 200 involves two methods: one is to detect the length of the detection channel 200 traversed by the float 400 within a fixed time, and the other is to detect the time required for the float 400 to travel a preset distance. However, if the length of the detection channel 200 traversed by the float 400 within a fixed time is detected, the sensor needs to accurately determine the position of the float 400. In this case, either sensors must be arranged along the detection channel 200 to detect the position reached by the float 400 within a fixed time, thereby further calculating the length of the detection channel 200 traversed by the float 400 within a fixed time, or the distance between the sensor and the float 400 is measured, which requires high measurement accuracy from the sensor. Alternatively, a scale can be set on the detection channel 200, and the length of the detection channel 200 traversed by the float 400 within a fixed time can be determined by taking a picture. Therefore, the cost requirement for detecting the length of the detection channel 200 traversed by the float 400 within a fixed time is relatively high. In contrast, the requirement for the measurement accuracy of the sensor is lower when detecting the time required for the float 400 to traverse a preset distance, and at least two sensors are required.

[0032] The float 400 can be spherical, cylindrical, or conical in shape. The float 400 can be made of plastic or metal, depending on the configuration of the detection channel 200 and the amount of detection gas used.

[0033] When the test product 500 is blocked, the less blocked it is, the more unobstructed it is, and the higher the pressure of the detection gas after passing through it. Similarly, when the test product 500 leaks, the less leaking it is, the more sealed it is, and the higher the pressure of the detection gas after passing through it. Since the detection gas acts on the float 400 after passing through the test product 500, the higher the pressure of the detection gas after passing through the test product 500, the faster the float 400 moves within the detection channel 200 under the influence of the detection gas. Therefore, regardless of whether the test product 500 is blocked or leaking, the degree of blockage or leakage is correlated with the moving speed of the float 400. Thus, the moving speed of the float 400 can be used not only to determine whether the test product 500 is blocked or leaking, but also to determine the degree of blockage or leakage.

[0034] The present invention also provides a method for detecting plugging and leaks, comprising the following steps:

[0035] Step 1: First, place the qualified product on the carrier 600. Then, the qualified product moves with the carrier 600 between the first seal 110 and the second seal 120. The positioning element clamps the carrier 600.

[0036] Step 2: Driven by the first driving member 130 and the second driving member 140, the first sealing member 110 and the second sealing member 120 move towards each other to seal the two ends of the product under test 500 respectively.

[0037] Step 3: The gas supply device releases detection gas, which flows sequentially through the first seal 110, the product under test 500, and the second seal 120 before entering the detection channel 200 and acting on the float 400. Under the action of the detection gas, the float 400 passes through two detection points formed by two sensors distributed at preset distance intervals. The moving speed under the action of the detection gas is determined based on the time it takes for the float 400 to pass through the two detection points.

[0038] Step 4: After the test is completed, the gas supply device stops releasing the test gas, and the float 400 resets under its own weight.

[0039] Step 5: Driven by the first driving member 130 and the second driving member 140, the first sealing member 110 and the second sealing member 120 move in opposite directions until they are disconnected from both ends of the product to be tested 500. The positioning member no longer clamps the carrier 600. The qualified product moves with the carrier 600 until it leaves the space between the first sealing member 110 and the second sealing member 120.

[0040] Step 6: Place the product to be tested 500 on the carrier 600, and repeat steps 1-5;

[0041] Step 7: Compare the moving speed of float 400 detected by the product under test 500 with the moving speed of float 400 of qualified products, and determine the blockage and leakage of product under test 500 based on the deviation between the two.

[0042] Of course, steps 1-5 are determined when the plugging and leak testing structure is used to test the product 500 for the first time. In subsequent testing, the test can be carried out directly from step 6, and the moving speed of the float 400 of the known qualified product can be compared to determine the plugging and leakage of the product 500.

[0043] It is understandable that the detection channel 200 can also extend horizontally. In this case, the leak detection structure also includes a reset channel. The reset channel and the detection channel 200 are connected. The reset gas enters the detection channel 200 from the reset channel and acts on the float 400, causing the float 400 to move in the opposite direction along the detection channel 200 to the air inlet 210. This allows the reset of the float 400 to be independent of the placement of the detection channel 200, expanding the application range of the leak detection structure. The reset gas can be a non-toxic and harmless gas, such as air, nitrogen, oxygen, or inert gas. For cost reduction, air is preferred as the reset gas.

[0044] Understandably, when the detection channel 200 is made of aluminum or other opaque material, the detection component 300 can use a distance sensor. In this case, the distance sensor is located at the end of the detection channel 200 furthest from the air inlet 210, and the air outlet 220 cannot be located at the other end of the detection channel 200, but rather near the other end. The distance sensor detects the distance between the float 400 and the distance sensor.

[0045] Understandably, in practical use, due to the limited sensitivity of the existing detection component 300, the current detection range for blockages and leaks is 10%-100%. However, as the sensitivity of the detection component 300 increases, the range of blockages and leaks that can be detected will further expand.

[0046] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A structure for detecting blockages and leaks, characterized in that: It includes an intake channel assembly (100), a detection channel (200), a float (400), and a detection component (300), wherein the detection component (300) includes at least two sensors distributed along a predetermined distance on the detection channel (200). The float (400) is located within the detection channel (200). Detection gas enters the detection channel (200) from the inlet channel assembly (100) through the product under test (500). The float (400) moves along the detection channel (200) under the action of the detection gas. The detection assembly (300) determines the value of the float (400) by detecting the time required for the float (400) to move from one sensor to another sensor at a predetermined distance within the detection channel (200). The moving speed is used to determine the blockage or leakage status of the test product (500). When the test product (500) is blocked, the less blocked the test product (500) is, the more unobstructed the test product (500) is, and the greater the gas pressure of the detection gas after passing through the test product (500) is. When the test product (500) leaks, the less leaked the test product (500) is, the more sealed the test product (500) is, and the greater the gas pressure of the detection gas after passing through the test product (500) is. The detection channel (200) includes an air inlet (210) and an air outlet (220). The float (400) moves between the air inlet (210) and the air outlet (220). The air inlet (210) is used to allow the detection gas to enter the detection channel (200), and the air outlet (220) is used to allow the gas between the air outlet (220) and the float (400) to leave the detection channel (200). The distance between the sensor near the air inlet (210) and the air inlet (210) is d, and the distance between the air inlet (210) and the air outlet (220) is D. d and D satisfy: 0≤d / D≤0.

3. The distance between the other sensor and the air inlet (210) is L. L and D satisfy: 0.1≤L / D≤0.9, and L>d.

2. The plugging and leak detection structure according to claim 1, characterized in that: The inner wall of the detection channel (200) is in circumferential fit with the float (400).

3. The plugging and leak detection structure according to claim 1, characterized in that: There is an angle α between the extension direction and the vertical direction of the detection channel (200), where 0≤α≤30°.

4. The plugging and leak detection structure according to claim 1, characterized in that: The plugging and leak detection structure also includes a reset channel, which is connected to the detection channel (200). Reset gas is introduced into the detection channel (200) from the reset channel, and the float (400) moves in the opposite direction along the detection channel (200) under the action of the reset gas.

5. The plugging and leak detection structure according to claim 1, characterized in that: The air intake channel assembly (100) includes a first seal (110) and a second seal (120). The first seal (110) and the second seal (120) respectively seal and connect the two ends of the product under test (500). The two ends of the first seal (110) respectively seal and connect the gas supply device that provides the detection gas and the product under test (500). The two ends of the second seal (120) respectively seal and connect the product under test (500) and the detection channel (200).

6. A method for detecting plugging and leaks, characterized in that: The blockage and leak detection structure as described in any one of claims 1 to 5 is used to perform blockage and leak detection. The blockage and leak detection method includes the following steps: controlling the detection gas to flow sequentially through the product to be tested (500) and the float (400), and detecting the moving speed of the float (400) under the action of the detection gas to determine the blockage or leakage of the product to be tested (500).

7. The method for detecting plugging and leaks according to claim 6, characterized in that: The speed at which the float (400) moves under the action of the detection gas is determined by detecting the time it takes for the float (400) to pass through two detection points at a preset distance.

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