Flow leak detection device and leak detection method

Abstract

The invention discloses a flow leak detection device and leak detection method.The flow leak detection device comprises a first connecting pipe, a gas collector, a vacuum pump and a processor, a connector is arranged at one end of the first connecting pipe and used for being detachably connected with a pipeline of a refrigeration product, and the other end of the first connecting pipe is connected with the gas collector; the internal pressure intensity 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 used for detecting the vacuum degree and an electromagnetic valve used for controlling on-off are arranged on the first connecting pipe, and the vacuum gauge is located between the connector and the electromagnetic valve. The vacuum pump, the vacuum gauge and the electromagnetic valve are electrically connected with the processor respectively; the method has the advantages of high detection precision, short detection time and low cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipeline leak detection, and particularly relates to a flow leak detection device and a leak detection method. BACKGROUND

[0002] For refrigeration products, the sealing performance of the refrigeration cycle pipeline is a key factor determining the core performance, service life, safety and environmental compliance of the product. A small leak can cause the slow loss of refrigerant, resulting in the attenuation of product refrigeration efficiency and the soaring of energy consumption. At the same time, the leaked refrigerant is a strong greenhouse gas, which can cause serious damage to the environment. Therefore, pipeline leak detection is an indispensable core quality detection link in the production process of refrigeration products.

[0003] Currently, the commonly used leak detection methods in the industry mainly include high-pressure nitrogen leak detection method and helium mass spectrometry leak detection method, but both of these two mainstream technologies have significant limitations: 1. High-pressure nitrogen leak detection method: nitrogen is injected into the refrigeration product pipeline, and then soap water is used to brush each weld point in the pipeline, and then the eyes are used to observe whether bubbles come out, the detection result depends on the subjective judgment of the vision and experience of the operator, which is prone to missed judgment or misjudgment, has low efficiency, and can only check large leaks, micro leaks cannot be observed, and soap water is an alkaline substance which has certain corrosiveness to the product; 2. Helium mass spectrometry leak detection method: helium is injected into the refrigeration product pipeline, and then it is placed in a vacuum box, vacuum is pumped by a vacuum pump, and finally whether there is helium leaked out in the vacuum box is detected by a helium leak detection analyzer. Since the equipment composed of a vacuum box, a vacuum pump and a helium leak detection analyzer is very expensive, and the cost of helium is also high, it is difficult to popularize.

[0004] Therefore, the applicant previously proposed a new flow control leak detection device and leak detection method (application number CN2024105842828), which optimizes the helium leak detection method, reduces the equipment cost compared with the prior art, and simplifies the leak detection method, and the detection accuracy can reach 0.05 ounces / year, but for special refrigeration products with high standards, the sealing performance of the pipeline has almost rigorous requirements, and the detection accuracy still faces challenges. SUMMARY

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

[0006] The technical scheme adopted by the present application to solve the above technical problems is: 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, the connector 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 connector and the electromagnetic valve, and the vacuum pump, the vacuum gauge and the electromagnetic valve are electrically connected with the processor respectively.

[0007] As a preferred, the connector comprises a mounting seat, a connecting seat, a locking assembly and a linear driving mechanism, a socket is arranged in the center of the mounting seat, a mounting groove is arranged on the back of the mounting seat, the socket is in communication with the groove bottom of the mounting groove, a plug groove corresponding to the mounting groove is arranged on the connecting seat, a connecting hole is arranged in the groove bottom of the plug groove, the other end of the connecting hole is connected with one end of the first connecting pipe, the pipeline passes through the socket, the mounting groove and extends into the plug groove in sequence, the locking assembly is arranged at the mounting groove and the plug groove, the linear driving mechanism is connected with the connecting seat, and the linear driving mechanism is used for driving the connecting seat to approach the mounting seat and making the locking assembly lock the pipeline, or is used for driving the connecting seat to move away from the mounting seat and making the locking assembly unlock the pipeline.

[0008] As a preferred, the locking assembly comprises an elastic clamp, a bushing and a copper ring, the elastic clamp is arranged in the mounting groove, the head of the elastic clamp extends out of the mounting groove and is provided with a first inclined guide surface, the bushing and the copper ring are stacked in the plug groove, and a second inclined guide surface is arranged on the side of the bushing facing the elastic clamp; when the connecting seat approaches the mounting seat, the first inclined guide surface contacts the second inclined guide surface and extrudes the elastic clamp, the elastic clamp bends inward and is sleeved on the outside of the pipeline; when the connecting seat moves away from the mounting seat, the elastic clamp restores outward under the action of elasticity and is separated from the pipeline.

[0009] As a preferred, the plug groove is a stepped groove composed of a first groove body and a second groove body, the first groove body, the second groove body and the connecting hole are in sequence communication, the inner diameter of the first groove body is greater than that of the second groove body, the bushing and the copper ring are stacked in the first groove body, an inductive sheet electrically connected with the processor is arranged in the second groove body, a stepped hole in communication with the connecting hole is arranged in the center of the inductive sheet, and the inductive sheet is used for detecting whether the pipeline is inserted.

[0010] As preferred, the back of the mounting base is fixedly provided with a sliding seat, the connecting seat is in sliding fit with the sliding seat, the front of the connecting seat is provided with a boss, the insertion slot is arranged at the top end of the boss, and the sliding seat is provided with an avoiding opening matched with the boss.

[0011] As preferred, the first connecting pipe is provided with a flow meter for monitoring the gas flow, the flow meter is located between the electromagnetic valve and the gas collector, the gas collector is provided with a temperature sensor for monitoring the temperature inside the gas collector, and the flow meter and the temperature sensor are connected with the processor respectively.

[0012] As preferred, the first connecting pipe, the gas collector, the vacuum pump and the processor are arranged in the shell, the joint extends out of the shell, the shell is provided with a control panel connected with the processor.

[0013] And a leak detection method is executed by the flow leak detection device, comprising the following steps:

[0014] S1, the pipeline of the refrigeration product is sequentially inserted into the insertion hole, the elastic chuck, the bushing, the copper ring and extends into the stepped hole of the inductive sheet, the inductive sheet detects the pipeline insertion and feeds back to the processor, and step S2 is executed;

[0015] S2, the connecting seat is driven to be close to the mounting base by the linear driving mechanism, the first inclined surface of the elastic chuck is in contact with the second inclined surface of the bushing and extrudes the elastic chuck, the elastic chuck is bent inward and is sleeved on the outside of the pipeline, the pipeline is locked by the elastic chuck, and then step S3 is executed;

[0016] S3, the electromagnetic valve is opened, the pipeline is communicated with the gas collector through the first connecting pipe, the air in the pipeline flows to the gas collector, and the vacuum pump is started to extract air, when the vacuum degree detected by the vacuum meter reaches the preset value, step S4 is executed;

[0017] S4, the electromagnetic valve is closed and the vacuum pump is closed for a delay time, so that the negative pressure in the pipeline is maintained and the pressure is maintained for a preset time, after the pressure maintaining is completed, step S5 is executed;

[0018] S5, the processor calculates the leak detection rate according to the vacuum degree change and the pressure maintaining time, the connecting seat is driven to be away from the mounting base by the linear driving mechanism, the elastic chuck is restored outward under the elastic action and is separated from the pipeline, and the unlocking is completed.

[0019] As preferred, during opening the electromagnetic valve, the flow meter monitors the actual gas flow through the first connecting pipe in real time and feeds back to the processor; when the electromagnetic valve is closed, the temperature sensor feeds back the monitored actual temperature value to the processor, the actual expansion coefficient is calculated according to the actual gas flow, the actual temperature value, the standard gas flow and the standard temperature value, and the actual expansion coefficient is compared with the preset standard expansion coefficient range, if it does not exceed the standard expansion coefficient range, it is determined that the leak detection result is reliable, if it exceeds the preset standard expansion coefficient range, it is determined that the leak detection result is unreliable.

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

[0021] ;

[0022] Wherein, Q ’ 漏 is the corrected leak detection rate, T1 is the actual temperature value, and T0 is the standard temperature value.

[0023] Compared with the prior art, the advantages of the present application are:

[0024] 1. The present application adopts negative pressure design instead of traditional high pressure inflation method, avoiding the safety risk and corrosive problem existing in high pressure leak detection, while improving the detection accuracy, which can achieve a leak detection rate of 0.01 oz / year, thus meeting the stringent sealing detection requirements of high standard refrigeration products;

[0025] 2. The present application sets a gas collector in the vacuum pipeline, optimizing the air extraction process, opening the electromagnetic valve can make the gas in the refrigeration product pipeline flow to the gas collector, cooperating with the vacuum pump can make the inside of the refrigeration product pipeline reach the preset vacuum degree within 3 seconds, greatly shortening the leak detection preparation time and improving the overall detection efficiency;

[0026] 3. The automatic clamping and releasing structure composed of linear drive mechanism, elastic chuck, bushing, copper ring and inductive sheet can complete the rapid locking and unlocking of the pipeline within 2 seconds, realize the rapid connection and disassembly operation, and effectively improve the detection efficiency;

[0027] 4. The structure of the present application is simpler than that of the existing leak detection device, the cost is lower, and it is easy to operate and use;

[0028] 5. The present application introduces flow monitoring and temperature monitoring, calculates the actual expansion coefficient according to the actual gas flow, the actual temperature value and the like, confirms whether it deviates from the preset standard expansion coefficient range, and corrects the leak detection rate, so as to avoid the interference of temperature fluctuation on the detection accuracy, and further ensure the scientificity and consistency of the detection result. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 Connection diagram of the present application;

[0030] Figure 2 Structure diagram of the joint in the present application;

[0031] Figure 3 Section structure diagram of the joint in the present application;

[0032] Figure 4 Exploded structure diagram of the joint in the present application;

[0033] Figure 5 Exploded structure diagram of the joint in the present application;

[0034] In the figure: 1, first connecting pipe; 2, gas collector; 3, vacuum pump; 4, processor; 41, data analysis module; 42, electrical control module; 5, shell; 6, joint; 61, mounting seat; 611, insertion hole; 612, mounting groove; 62, connecting seat; 621, insertion slot; 6211, first slot body; 6212, second slot body; 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, avoiding opening; 7, pipeline; 8, second connecting pipe; 9, vacuum gauge; 10, electromagnetic valve; 11, control panel; 12, flow meter; 13, temperature sensor; 14, inductive sheet. DETAILED DESCRIPTION

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

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] Example one: 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] Embodiment four: a leak detection method, performed by the flow leak detection device of the above embodiments, comprising the following steps:

[0045] S1, the pipeline 7 of the refrigeration product is sequentially inserted into the insertion hole 611, the elastic chuck 631, the bushing 632, the copper ring 633, and extends into the stepped hole of the inductive sheet 14. The inductive sheet 14 detects that the pipeline 7 is inserted and feeds back to the processor 4, and step S2 is performed;

[0046] S2, drive the connecting seat 62 to approach the mounting seat 61 through the linear drive mechanism 64, the first inclined surface 6311 of the elastic chuck 631 contacts the second inclined surface 6321 of the bushing 632 and extrudes the elastic chuck 631, the elastic chuck 631 bends inward and is sleeved on the outside of the pipeline 7, and the pipeline 7 is locked through the elastic chuck 631, and then step S3 is performed;

[0047] S3, open 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, and when the vacuum degree detected by the vacuum gauge 9 reaches the preset value, step S4 is performed;

[0048] S4, close the electromagnetic valve 10 and delay closing 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 S5 is performed;

[0049] S5, the processor 4 calculates the leak detection rate according to the change of the vacuum degree and the pressure maintaining time, and drives the connecting seat 62 to move away from the mounting seat 61 through the linear drive mechanism 64. The elastic chuck 631 returns outward under the action of elasticity and is separated from the pipeline 7, and the unlocking is completed.

[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 maintaining time is 5 seconds.

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

[0052] ;

[0053] Wherein, Q 漏 is the leak detection rate, V is the volume of the closed cavity formed between the pipeline and the electromagnetic 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 pressure maintaining, and P0 is the pressure at the end of pressure maintaining.

[0054] Further, 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 does not exceed the standard expansion coefficient range, it is determined that the leak detection result is reliable, if it exceeds the preset standard expansion coefficient range, it is determined that the leak detection result is unreliable.

[0055] Specifically, the calculation formula of the actual expansion coefficient is as follows:

[0056] ;

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

[0058] Further, according to the actual temperature value monitored by the temperature sensor 13, the leak detection rate is corrected, and the calculation formula of the leak detection rate is as follows:

[0059]

[0060] Wherein, Q ’ 漏 is the corrected leak detection rate, T1 is the actual temperature value, and T0 is the standard temperature value. By introducing the temperature correction mechanism, the interference of temperature fluctuation on the detection accuracy is avoided, which helps to improve the accuracy of the detection result.

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

[0062] The above has exemplarily described the present application in combination with the drawings, and it is obvious that the implementation of the present application is not limited by the above method. Various improvements or direct applications of the inventive concept and technical scheme to other occasions without improvement are within the protection scope of the present application.

Claims

1. A flow leak detection device, characterized by: The application relates to a refrigerant recovery device, which comprises 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 joint (6) for detachably connecting with a pipe (7) of a refrigerant 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), a vacuum gauge (9) for detecting vacuum degree and an electromagnetic valve (10) for controlling on-off are arranged on the first connecting pipe (1), the vacuum gauge (9) is located between the joint (6) and the electromagnetic valve (10), and the vacuum pump (3), the vacuum gauge (9) and the electromagnetic valve (10) are electrically connected with the processor (4) respectively.

2. A flow leak detection device according to claim 1, wherein: The joint (6) comprises a mounting base (61), a connecting base (62), a locking assembly (63) and a linear driving mechanism (64), the center of the mounting base (61) is provided with a insertion hole (611), the back of the mounting base (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 base (62) is provided with an insertion groove (621) corresponding to the mounting groove (612), the groove bottom of the insertion groove (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 pipe (7) passes through the insertion hole (611), the mounting groove (612) and extends into the insertion groove (621) in sequence, the locking assembly (63) is arranged at the mounting groove (612) and the insertion groove (621), the linear driving mechanism (64) is connected with the connecting base (62), and the linear driving mechanism (64) is used for driving the connecting base (62) to be close to the mounting base (61) and making the locking assembly (63) lock the pipe (7), or is used for driving the connecting base (62) to be away from the mounting base (61) and making the locking assembly (63) unlock the pipe (7).

3. A flow leak detection device according to claim 2, wherein: The locking assembly (63) comprises an elastic chuck (631), a bushing (632) and a copper ring (633), the elastic chuck (631) is arranged in the mounting groove (612), the head of the elastic chuck (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 a second inclined guide surface (6321) is arranged on the side of the bushing (632) facing the elastic chuck (631). When the connecting seat (62) is close to the mounting seat (61), the first inclined guide surface (6311) contacts and extrudes the second inclined guide surface (6321), and 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).

4. A flow leak detection device according to claim 3, wherein: The insertion slot (621) is a stepped slot composed of a first slot body (6211) and a second slot body (6212), the first slot body (6211), the second slot body (6212) and the connecting hole (622) are sequentially communicated, the inner diameter of the first slot body (6211) is greater than that of the second slot body (6212), the bushing (632) and the copper ring (633) are stacked in the first slot body (6211), the inductive sheet (14) electrically connected with the processor (4) is arranged in the second slot body (6212), and a stepped hole in communication with the connecting hole (622) is arranged at the center of the inductive sheet (14). The inductive sheet (14) is used for detecting whether the pipeline (7) is inserted.

5. A flow leak detector according to claim 2, 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 slot (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).

6. A flow leak detector according to claim 1, wherein: The first connecting pipe (1) is provided with a flow meter (12) for monitoring the gas flow, the flow meter (12) is located between the electromagnetic valve (10) and the gas collector (2), the gas collector (2) is provided with a temperature sensor (13) for monitoring the temperature inside the gas collector (2), and the flow meter (12) and the temperature sensor (13) are connected with the processor (4) respectively.

7. A flow leak detector according to claim 1, wherein: The first connecting pipe (1), the gas collector (2), the vacuum pump (3) and the processor (4) are arranged in the shell (5), the connector (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).

8. A leak detection method, performed by the flow leak detection apparatus according to any one of claims 1 to 7, characterized by: The following steps are included: S1, the pipeline (7) of the refrigeration product is sequentially inserted into the insertion hole (611), the elastic clamp (631), the bushing (632), the copper ring (633) and the stepped hole of the inductive sheet (14), the inductive sheet (14) detects that the pipeline (7) is inserted and feeds back to the processor (4), and step S2 is performed. S2, drive the connecting seat (62) to approach the mounting seat (61) through the linear drive mechanism (64), the first inclined surface (6311) of the elastic chuck (631) contacts the second inclined surface (6321) of the bushing (632) and extrudes the elastic chuck (631), the elastic chuck (631) bends inward and is sleeved outside the pipeline (7), the pipeline (7) is locked through the elastic chuck (631), and then step S3 is performed; S3, open the electromagnetic valve (10), the pipeline (7) communicates 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 a preset value, step S4 is performed; S4, close the electromagnetic valve (10) and delay the closing of the vacuum pump (3), so that the pipeline (7) maintains negative pressure and maintains pressure for a preset time, after the pressure maintaining is finished, step S5 is performed; S5, the processor (4) calculates the leak detection rate according to the vacuum degree change and the pressure maintaining time, and drives the connecting seat (62) to move away from the mounting seat (61) through the linear drive mechanism (64), the elastic chuck (631) returns outward under the action of elasticity and is separated from the pipeline (7), and the unlocking is completed.

9. A leak detection method according to claim 8, characterised in that: In the process of opening the electromagnetic valve (10), the flowmeter (12) monitors the actual gas flow passing 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 does not exceed the standard expansion coefficient range, it is determined that the leak detection result is reliable, if it exceeds the preset standard expansion coefficient range, it is determined that the leak detection result is unreliable.

10. A leak detection method according to claim 9, wherein: 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.

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