Flow leak detection device and method

Abstract

The application discloses a flow leak detection device and a leak detection method. The flow leak detection device comprises a first connecting pipe, a gas collector, a vacuum pump and a processor. One end of the first connecting pipe is provided with a joint. The joint is used for detachable connection with a pipeline of a refrigeration product. The other end of the first connecting pipe is connected with the gas collector. The internal pressure of the gas collector is lower than 10 Pa. The gas collector is connected with the vacuum pump through a second connecting pipe. A vacuum gauge for detecting vacuum degree and an electromagnetic valve for controlling on-off are arranged on the first connecting pipe. The vacuum gauge is located between the joint and the electromagnetic valve. The vacuum pump, the vacuum gauge and the electromagnetic valve are electrically connected with the processor respectively. The application has the advantages of high detection precision, short detection time and low cost.

Description

Technical Field

[0001] This invention belongs to the field of pipeline leak detection technology, and in particular relates to a flow leak detection device and a leak detection method. Background Technology

[0002] For refrigeration products, the sealing of the refrigeration circulation piping is a key factor determining the product's core performance, lifespan, safety, and environmental compliance. Even minor leaks can lead to slow refrigerant loss, causing a decrease in cooling efficiency and a surge in energy consumption. Furthermore, leaked refrigerants are often potent greenhouse gases, causing severe environmental damage. Therefore, pipe leak detection is an indispensable core quality inspection step in the refrigeration product manufacturing process.

[0003] Currently, the commonly used leak detection methods in the industry mainly include high-pressure nitrogen leak detection and helium gas chromatography leak detection. However, both of these mainstream technologies have significant limitations: 1. High-pressure nitrogen leak detection: Nitrogen is injected into the piping of the refrigeration product, and each weld point in the piping is brushed with soapy water. Then, the operator is visually inspected for bubbles. The detection results rely on the operator's eyesight and experience for subjective judgment, which is prone to missed or false detections. It is inefficient and can only detect large leaks, not micro-leaks. In addition, soapy water is an alkaline substance and has a certain corrosive effect on the product. 2. Helium gas chromatography leak detection: Helium is injected into the piping of the refrigeration product and then placed in a vacuum chamber. A vacuum pump is used to evacuate the chamber, and finally, a helium leak detection analyzer is used to detect whether there is any helium leakage in the vacuum chamber. Since the equipment consisting of the vacuum chamber, vacuum pump, and helium leak detection analyzer is very expensive, and the cost of helium is also high, it is difficult to popularize.

[0004] To address this, the applicant previously proposed a new flow control leak detection device and method (application number CN2024105842828). This technical solution optimizes the helium leak detection method, reduces equipment costs and simplifies the leak detection method compared to existing technologies, and achieves a detection accuracy of 0.05 ounces / year. However, for high-standard special refrigeration products, the sealing of the pipeline has almost stringent requirements, and the detection accuracy still faces challenges. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a flow leakage detection device and method, which has high detection accuracy, short detection time and low cost.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a flow leak detection device, comprising a first connecting pipe, a gas collector, a vacuum pump and a processor. One end of the first connecting pipe is provided with a connector for detachable connection with the pipeline of a refrigeration product. The other end of the first connecting pipe is connected to the gas collector. The internal pressure of the gas collector is lower than 10 Pa. The gas collector is connected to the vacuum pump through a second connecting pipe. A vacuum gauge for detecting the vacuum degree and a solenoid valve for controlling the on / off state are provided on the first connecting pipe. The vacuum gauge is located between the connector and the solenoid valve. The vacuum pump, the vacuum gauge, and the solenoid valve are electrically connected to the processor.

[0007] Preferably, the connector includes a mounting base, a connecting base, a locking component, and a linear drive mechanism. The mounting base has a central insertion hole and a mounting groove on its back side. The insertion hole communicates with the bottom of the mounting groove. The connecting base has a slot corresponding to the mounting groove. The bottom of the slot has a connecting hole, and the other end of the connecting hole is connected to one end of the first connecting pipe. The pipe passes through the insertion hole and the mounting groove in sequence and extends into the slot. The locking component is located at the mounting groove and the slot. The linear drive mechanism is connected to the connecting base. The linear drive mechanism is used to drive the connecting base closer to the mounting base and lock the pipe with the locking component, or to drive the connecting base away from the mounting base and unlock the pipe with the locking component.

[0008] Preferably, the locking assembly includes a resilient clamp, a bushing, and a copper ring. The resilient clamp is disposed within the mounting groove, with its head extending out of the groove and having a first inclined guide surface. The bushing and the copper ring are stacked within the slot, and the bushing has a second inclined guide surface on its side facing the resilient clamp. When the connecting seat approaches the mounting seat, the first and second inclined guide surfaces contact and compress the resilient clamp, causing it to bend inward and fit over the outside of the pipe. When the connecting seat moves away from the mounting seat, the resilient clamp returns outward under elastic force and separates from the pipe.

[0009] Preferably, the slot is a stepped groove composed of a first groove and a second groove, wherein the first groove, the second groove, and the connecting hole are connected in sequence, the inner diameter of the first groove is larger than the inner diameter of the second groove, the bushing and the copper ring are stacked in the first groove, and a sensing plate electrically connected to the processor is provided in the second groove. The center of the sensing plate is provided with a stepped hole connected to the connecting hole, and the sensing plate is used to detect whether a pipe is inserted.

[0010] Preferably, a sliding seat is fixedly provided on the back of the mounting base, the connecting seat slides with the sliding seat, a boss is provided on the front of the connecting seat, the slot is provided on the top of the boss, and an clearance opening adapted to the boss is provided on the sliding seat.

[0011] Preferably, a flow meter for monitoring gas flow is provided on the first connecting pipe. The flow meter is located between the solenoid valve and the gas collector. A temperature sensor for monitoring its internal temperature is inserted into the gas collector. The flow meter and the temperature sensor are respectively connected to the processor.

[0012] Preferably, the system also includes a housing, in which the first connecting pipe, the gas collector, the vacuum pump, and the processor are all disposed. The connector extends out of the housing, and a control panel is disposed on the housing and connected to the processor.

[0013] A leak detection method, performed by the aforementioned flow leak detection device, includes the following steps:

[0014] S1. Pass the pipe of the refrigeration product through the socket, elastic clamp, bushing, copper ring in sequence and insert it into the stepped hole of the sensor. The sensor detects the insertion of the pipe and sends feedback to the processor. Execute step S2.

[0015] S2. The connecting seat is driven close to the mounting seat by the linear drive mechanism. The first inclined guide surface of the elastic clamp contacts the second inclined guide surface of the bushing and squeezes the elastic clamp. The elastic clamp bends inward and fits on the outside of the pipe. The pipe is locked by the elastic clamp. Then, step S3 is executed.

[0016] S3. Open the solenoid valve, and the pipeline is connected to the gas collector through the first connecting pipe. The air in the pipeline flows to the gas collector. At the same time, the vacuum pump is started to extract the air. When the vacuum level detected by the vacuum gauge reaches the preset value, step S4 is executed.

[0017] S4. Close the solenoid valve and delay the vacuum pump to maintain negative pressure in the pipeline for a preset time. After the pressure holding is completed, proceed to step S5.

[0018] S5. The processor calculates the leak detection rate based on the change in vacuum and the holding time, and drives the connecting seat away from the mounting seat through a linear drive mechanism. The elastic clamp returns outward under the action of elasticity and separates from the pipeline, thus completing the unlocking.

[0019] Preferably, during the opening of the solenoid valve, the flow meter monitors the actual gas flow rate through the first connecting pipe in real time and feeds it back to the processor; when the solenoid valve is closed, the temperature sensor feeds back the monitored actual temperature value to the processor. The processor calculates the actual expansion coefficient based on the actual gas flow rate, actual temperature value, standard gas flow rate, and standard temperature value, and compares the actual expansion coefficient with the preset standard expansion coefficient range. If the actual expansion coefficient does not exceed the standard expansion coefficient range, the leak detection result is determined to be reliable; if it exceeds the preset standard expansion coefficient range, the leak detection result is determined to be unreliable.

[0020] As a preferred method, the leak detection rate is corrected based on the actual temperature value monitored by the temperature sensor, and the calculation formula is as follows:

[0021] ;

[0022] Among them, Q ’ 漏 The corrected leak detection rate is given by T1, where T1 is the actual temperature value and T0 is the standard temperature value.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. This invention uses a negative pressure design to replace the traditional high-pressure gas filling method, avoiding the safety risks and corrosive problems of high-pressure leak detection, while improving the detection accuracy, achieving a leak detection rate of 0.01 ounces / year, thereby meeting the stringent sealing test requirements of high-standard refrigeration products;

[0025] 2. This invention sets up a gas collector in the vacuum pipeline, which optimizes the gas extraction process. When the solenoid valve is opened, the gas in the refrigeration product pipeline can flow to the gas collector. With the help of the vacuum pump, the pipeline of the refrigeration product can reach the preset vacuum level within 3 seconds, which greatly shortens the leak detection preparation time and improves the overall detection efficiency.

[0026] 3. The automatic clamping and unclamping structure, consisting of a linear drive mechanism, elastic chuck, bushing, copper ring, and induction plate, can quickly lock and unlock the pipeline within 2 seconds, enabling rapid connection and disassembly operations and effectively improving testing efficiency.

[0027] 4. The structure of the present invention is simpler than that of existing leak detection devices, with lower cost and easier operation and use;

[0028] 5. This invention introduces flow monitoring and temperature monitoring, calculates the actual expansion coefficient based on the actual gas flow rate and actual temperature value, confirms whether it deviates from the preset standard expansion coefficient range, and corrects the leak detection rate, thereby avoiding the interference of temperature fluctuations on the detection accuracy and further ensuring the scientificity and consistency of the detection results. Attached Figure Description

[0029] Figure 1 This is a connection diagram of the present invention;

[0030] Figure 2 This is a schematic diagram of the joint structure in this invention;

[0031] Figure 3 This is a schematic cross-sectional view of the joint in this invention;

[0032] Figure 4 This is a schematic diagram of the exploded structure at the joint in this invention;

[0033] Figure 5 This is an exploded structural diagram of the connecting seat in this invention.

[0034] In the diagram: 1. First connecting pipe; 2. Gas collector; 3. Vacuum pump; 4. Processor; 41. Data analysis module; 42. Electrical control module; 5. Housing; 6. Connector; 61. Mounting base; 611. Socket; 612. Mounting groove; 62. Connecting base; 621. Slot; 6211. First groove; 6212. Second groove; 622. Connecting hole; 623. Boss; 63. Locking assembly; 631. Elastic chuck; 6311. First inclined guide surface; 632. Bushing; 6321. Second inclined guide surface; 633. Copper ring; 64. Linear drive mechanism; 65. Sliding seat; 651. Clearance opening; 7. Pipe; 8. Second connecting pipe; 9. Vacuum gauge; 10. Solenoid valve; 11. Control panel; 12. Flow meter; 13. Temperature sensor; 14. Sensing plate. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] Example 1: As Figure 1As shown, a flow leak detection device includes a first connecting pipe 1, a gas collector 2, a vacuum pump 3, a processor 4, and a housing 5. One end of the first connecting pipe 1 is provided with a connector 6, which is used for detachable connection with the pipe 7 of a refrigeration product. The other end of the first connecting pipe 1 is connected to the gas collector 2. The internal pressure of the gas collector 2 is less than 10 Pa. The gas collector 2 is connected to the vacuum pump 3 through a second connecting pipe 8. A vacuum gauge 9 for detecting the vacuum degree and a solenoid valve 10 for controlling the on / off state are provided on the first connecting pipe 1. The vacuum gauge 9 is located between the connector 6 and the solenoid valve 10. The first connecting pipe 1, the gas collector 2, the vacuum pump 3, and the processor 4 are all housed inside the housing 5. The connector 6 extends out of the housing 5. A control panel 11 is provided on the housing 5. The vacuum pump 3, the vacuum gauge 9, the solenoid valve 10, and the control panel 11 are electrically connected to the processor 4.

[0038] In this embodiment, a flow meter 12 for monitoring gas flow is provided on the first connecting pipe 1. The flow meter 12 is located between the solenoid valve 10 and the gas collector 2. A temperature sensor 13 for monitoring its internal temperature is installed on the gas collector 2. The flow meter 12 and the temperature sensor 13 are respectively connected to the processor 4.

[0039] Example 2: Figures 1 to 4 As shown, the rest is the same as in Embodiment 1, except that the connector 6 includes a mounting base 61, a connecting base 62, a locking component 63, and a linear drive mechanism 64. The mounting base 61 has a socket 611 at its center and a mounting groove 612 on its back. The socket 611 is connected to the bottom of the mounting groove 612. The connecting base 62 has a slot 621 corresponding to the mounting groove 612. The bottom of the slot 621 has a connecting hole 622. The other end of the connecting hole 622 is connected to one end of the first connecting pipe 1. The pipe 7 passes through the socket 611 and the mounting groove 612 in sequence and extends into the slot 621. The locking component 63 is located at the mounting groove 612 and the slot 621. The linear drive mechanism 64 is connected to the connecting base 62. The linear drive mechanism 64 is used to drive the connecting base 62 closer to the mounting base 61 and lock the pipe 7 with the locking component 63, or to drive the connecting base 62 away from the mounting base 61 and unlock the pipe 7 with the locking component 63. Among them, the linear drive mechanism 64, if using a common pneumatic or hydraulic cylinder, has its drive end electrically connected to the processor 4.

[0040] Furthermore, the locking assembly 63 includes an elastic clamp 631, a bushing 632, and a copper ring 633. The elastic clamp 631 is disposed within the mounting groove 612, with its head extending out of the groove and having a first inclined guide surface 6311. The bushing 632 and the copper ring 633 are stacked within the slot 621, and the bushing 632 has a second inclined guide surface 6321 on the side facing the elastic clamp 631. When the connecting seat 62 approaches the mounting seat 61, the first inclined guide surface 6311 contacts the second inclined guide surface 6321 and compresses the elastic clamp 631, causing it to bend inward and fit over the outside of the pipe 7. When the connecting seat 62 moves away from the mounting seat 61, the elastic clamp 631 returns outward under elastic action and separates from the pipe 7.

[0041] Example 3: Figures 1 to 5 As shown, the rest is the same as in Embodiment 2, except that the slot 621 is a stepped slot composed of a first slot 6211 and a second slot 6212. The first slot 6211, the second slot 6212 and the connecting hole 622 are connected in sequence. The inner diameter of the first slot 6211 is larger than the inner diameter of the second slot 6212. The bushing 632 and the copper ring 633 are stacked in the first slot 6211. The second slot 6212 is provided with a sensing plate 14 that is electrically connected to the processor 4. The center of the sensing plate 14 is provided with a stepped hole that is connected to the connecting hole 622. The sensing plate 14 is used to detect whether a pipe 7 is inserted. By adding a sensor 14, when the pipe 7 is inserted, the processor 4 controls the linear drive mechanism 64 to lock the connector 62 close to the mounting base 61 without manual intervention, thus achieving automatic clamping and disengagement and improving detection efficiency. By setting the slot 621 as a stepped groove, when the connector 62 is close to the mounting base 61, the force of the elastic clamp 631 acting on the bushing 632 and the copper ring 633 is ultimately transmitted to the stepped surface of the stepped groove, instead of acting on the sensor 14, thus avoiding damage caused by squeezing the sensor 14.

[0042] In this embodiment, a sliding seat 65 is fixedly provided on the back of the mounting base 61, and the connecting seat 62 is slidably engaged with the sliding seat 65. A boss 623 is provided on the front of the connecting seat 62, and a slot 621 is provided on the top of the boss 623. The sliding seat 65 is provided with a clearance opening 651 that matches the boss 623. The boss 623 and the clearance opening 651 cooperate to guide, ensuring that the mounting base 61 can fit tightly with the connecting seat 62, and also helping to improve the sealing between the mounting base 61 and the connecting seat 62.

[0043] Conventionally, the processor 4 includes a data analysis module 41 and an electrical control module 42 that are interconnected. The vacuum gauge 9, flow meter 12, temperature sensor 13, and control panel 11 are electrically connected to the data analysis module 41, and the solenoid valve 10, vacuum pump 3, and linear drive mechanism 64 are electrically connected to the electrical control module 42.

[0044] Example 4: A leak detection method, executed by the flow leak detection device described in the above examples, includes the following steps:

[0045] S1. Pass the pipe 7 of the refrigeration product through the socket 611, the elastic clamp 631, the bushing 632, and the copper ring 633 in sequence and insert it into the stepped hole of the sensor plate 14. The sensor plate 14 detects that the pipe 7 has been inserted and sends feedback to the processor 4, and executes step S2.

[0046] S2. The linear drive mechanism 64 drives the connecting seat 62 close to the mounting seat 61. The first inclined guide surface 6311 of the elastic clamp 631 contacts the second inclined guide surface 6321 of the bushing 632 and squeezes the elastic clamp 631. The elastic clamp 631 bends inward and fits on the outside of the pipe 7. The pipe 7 is locked by the elastic clamp 631, and then step S3 is executed.

[0047] S3. Open the solenoid valve 10. Pipe 7 is connected to the gas collector 2 through the first connecting pipe 1. The air in pipe 7 flows to the gas collector 2. At the same time, start the vacuum pump 3 to extract the air. When the vacuum level detected by the vacuum gauge 9 reaches the preset value, execute step S4.

[0048] S4. Close the solenoid valve 10 and delay the vacuum pump 3 to maintain negative pressure in the pipeline 7 for a preset time. After the pressure holding is completed, proceed to step S5.

[0049] S5, the processor 4 calculates the leak detection rate based on the change in vacuum and the pressure holding time, and drives the connecting seat 62 away from the mounting seat 61 through the linear drive mechanism 64. The elastic clamp 631 returns outward under the elastic action and separates from the pipe 7, thus completing the unlocking.

[0050] In this embodiment, the internal pressure of the gas collector 2 is preferably 5 Pa, the preset value of the vacuum degree is preferably 15 Pa, and the preset pressure holding time is 5 seconds.

[0051] In step S5, the formula for calculating the leak detection rate is as follows:

[0052] ;

[0053] Among them, Q 漏 The leak detection rate is given by V, the volume of the sealed cavity formed between the pipeline and the solenoid valve, M is the molar mass of the gas, R is the ideal gas constant, T is the thermodynamic temperature of the gas, P1 is the pressure at the beginning of the pressure holding period, and P0 is the pressure at the end of the pressure holding period.

[0054] Furthermore, during the opening of the solenoid valve 10, the flow meter 12 monitors the actual gas flow rate through the first connecting pipe 1 in real time and feeds it back to the processor 4; when the solenoid valve 10 is closed, the temperature sensor 13 feeds back the monitored actual temperature value to the processor 4, calculates the actual expansion coefficient based on the actual gas flow rate, actual temperature value, standard gas flow rate, and standard temperature value, and compares the actual expansion coefficient with the preset standard expansion coefficient range. If it does not exceed the standard expansion coefficient range, the leak detection result is determined to be reliable; if it exceeds the preset standard expansion coefficient range, the leak detection result is determined to be unreliable.

[0055] Specifically, the formula for calculating the actual expansion coefficient is as follows:

[0056] ;

[0057] Where, β 实际 Where V1 is the actual gas flow rate, V0 is the standard gas flow rate, T1 is the actual temperature, and T0 is the standard temperature. The preset standard expansion coefficient range is preferably less than 2%.

[0058] Furthermore, the leak detection rate is corrected based on the actual temperature value monitored by temperature sensor 13. The formula for calculating the leak detection rate is as follows:

[0059]

[0060] Among them, Q ’ 漏 The corrected leak detection rate is represented by T1, where T1 is the actual temperature value and T0 is the standard temperature value. By introducing a temperature correction mechanism, the interference of temperature fluctuations on detection accuracy is avoided, which helps to improve the accuracy of the detection results.

[0061] It should be noted that before leak testing of the refrigeration product, a standard part of the same refrigeration product should be connected to this flow leak detection device. The standard gas flow rate V0 and standard temperature value T0 should be obtained according to the above leak detection method, and the corresponding standard expansion coefficient range should be set according to the refrigeration product.

[0062] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A leak detection method, performed by a flow leak detection device, the flow leak detection device comprising a first connecting pipe (1), a gas collector (2), a vacuum pump (3) and a processor (4), one end of the first connecting pipe (1) is provided with a connector (6) for detachable connection with a pipe (7) of a refrigeration product, the other end of the first connecting pipe (1) is connected with the gas collector (2), the internal pressure of the gas collector (2) is lower than 10 Pa, the gas collector (2) is connected with the vacuum pump (3) through a second connecting pipe (8), the first connecting pipe (1) is provided with a vacuum gauge (9) for detecting vacuum degree and a solenoid valve (10) for controlling on-off, the vacuum gauge (9) is located between the connector (6) and the solenoid valve (10), the first connecting pipe (1) is provided with a flow meter (12) for monitoring gas flow, the flow meter (12) is located between the solenoid valve (10) and the gas collector (2), the gas collector (2) is inserted with a temperature sensor (13) for monitoring the internal temperature thereof, the vacuum pump (3), the vacuum gauge (9), the solenoid valve (10), the flow meter (12) and the temperature sensor (13) are respectively connected with the processor (4), characterized in that: The method comprises the following steps: S1, connecting and locking the pipeline (7) of the refrigeration product with the joint (6), and performing step S2; S2, opening the electromagnetic valve (10), the pipeline (7) is communicated with the gas collector (2) through the first connecting pipe (1), the air in the pipeline (7) flows to the gas collector (2), and the vacuum pump (3) is started to extract air, when the vacuum degree detected by the vacuum gauge (9) reaches the preset value, step S3 is performed; S3, closing the electromagnetic valve (10) and delaying the closing of the vacuum pump (3), so that the pipeline (7) maintains negative pressure and maintains pressure for a preset time, and after the pressure maintaining is completed, step S4 is performed; S4, the processor (4) calculates the leak detection rate according to the vacuum degree change and the pressure maintaining time, and separates the pipeline (7) of the refrigeration product from the joint (6) to complete the unlocking; In the process of opening the electromagnetic valve (10), the flow meter (12) monitors the actual gas flow through the first connecting pipe (1) in real time and feeds back to the processor (4); when the electromagnetic valve (10) is closed, the temperature sensor (13) feeds back the monitored actual temperature value to the processor (4), calculates the actual expansion coefficient according to the actual gas flow, the actual temperature value, the standard gas flow and the standard temperature value, and compares the actual expansion coefficient with the preset standard expansion coefficient range, if it is not beyond the standard expansion coefficient range, it is determined that the leak detection result is reliable, if it is beyond the preset standard expansion coefficient range, it is determined that the leak detection result is unreliable.

2. A leak detection method according to claim 1, characterised in that: The leak detection rate is corrected according to the actual temperature value monitored by the temperature sensor (13), and the calculation formula is as follows: ； wherein Q ’ 漏 is the corrected leak rate, T1 is the actual temperature value, and T0 is the standard temperature value.

3. A method of leak detection according to claim 1, wherein: The joint (6) comprises a mounting seat (61), a connecting seat (62), a locking assembly (63) and a linear driving mechanism (64), the center of the mounting seat (61) is provided with a insertion hole (611), the back of the mounting seat (61) is provided with a mounting groove (612), the insertion hole (611) is communicated with the groove bottom of the mounting groove (612), the connecting seat (62) is provided with a insertion slot (621) corresponding to the mounting groove (612), the groove bottom of the insertion slot (621) is provided with a connecting hole (622), the other end of the connecting hole (622) is connected with one end of the first connecting pipe (1), the pipeline (7) passes through the insertion hole (611), the mounting groove (612) and extends into the insertion slot (621) in sequence, the locking assembly (63) is arranged at the mounting groove (612) and the insertion slot (621), the linear driving mechanism (64) is connected with the connecting seat (62), the linear driving mechanism (64) is used for driving the connecting seat (62) to approach the mounting seat (61) and making the locking assembly (63) lock the pipeline (7), or driving the connecting seat (62) to move away from the mounting seat (61) and making the locking assembly (63) unlock the pipeline (7).

4. A leak detection method according to claim 3, wherein: The locking assembly (63) comprises an elastic clamp (631), a bushing (632) and a copper ring (633), the elastic clamp (631) is arranged in the mounting groove (612), the head of the elastic clamp (631) extends out of the mounting groove (612) and is provided with a first inclined guide surface (6311), the bushing (632) and the copper ring (633) are stacked in the insertion groove (621), and one side of the bushing (632) towards the elastic clamp (631) is provided with a second inclined guide surface (6321). When the connecting seat (62) is close to the mounting seat (61), the first inclined guide surface (6311) is in contact with the second inclined guide surface (6321) and extrudes the elastic clamp (631), the elastic clamp (631) bends inward and is sleeved outside the pipeline (7); when the connecting seat (62) is away from the mounting seat (61), the elastic clamp (631) is restored outward under the action of elasticity and is separated from the pipeline (7).

5. A method of leak detection according to claim 4, wherein: The insertion groove (621) is a stepped groove composed of a first groove body (6211) and a second groove body (6212), the first groove body (6211), the second groove body (6212) and the connecting hole (622) are sequentially communicated, the inner diameter of the first groove body (6211) is greater than that of the second groove body (6212), the bushing (632) and the copper ring (633) are stacked in the first groove body (6211), the second groove body (6212) is provided with an inductive sheet (14) electrically connected with the processor (4), the center of the inductive sheet (14) is provided with a stepped hole communicated with the connecting hole (622), and the inductive sheet (14) is used for detecting whether the pipeline (7) is inserted.

6. A leak detection method according to claim 3, wherein: The back of the mounting seat (61) is fixedly provided with a sliding seat (65), the connecting seat (62) is in sliding fit with the sliding seat (65), the front of the connecting seat (62) is provided with a boss (623), the insertion groove (621) is arranged at the top end of the boss (623), and the sliding seat (65) is provided with an avoiding opening (651) matched with the boss (623).

7. A method of leak detection according to claim 1, wherein: Further comprising a shell (5), the first connecting pipe (1), the gas collector (2), the vacuum pump (3) and the processor (4) are arranged in the shell (5), the joint (6) extends out of the shell (5), the shell (5) is provided with a control panel (11), and the control panel (11) is connected with the processor (4).

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