Storage tank air tightness detection device

Abstract

The invention discloses a storage tank air tightness detection device, which comprises a base, an observation bin, a mobile detection mechanism and a pressure adjusting mechanism, the observation bin is arranged on the base, the pressure adjusting mechanism is arranged on the base, and the mobile detection mechanism comprises a bearing block, a first driving assembly and two groups of symmetrically arranged smoke detection assemblies. The first driving assembly is arranged in the base, the bearing block is horizontally and movably arranged in the base through the first driving assembly, the two sets of symmetrically-arranged smoke detection assemblies are arranged on the bearing block, and each smoke detection assembly comprises a connecting pipe, a supporting pipe, two sets of smoke outlet pipes and two sets of observation assemblies. According to the storage tank air tightness detection device provided by the embodiment of the invention, by integrating mobile scanning, smoke tracing and visual detection technologies, automatic and accurate positioning of a leakage point of the storage tank is realized, the detection sensitivity and efficiency are improved, nondestructive detection is completed in a closed and clean environment, and the problems of difficult positioning, low efficiency and pollution of a traditional method are solved.

Description

Technical Field

[0001] This application relates to the technical field of pressure vessel airtightness testing, and more particularly to a storage tank airtightness testing device. Background Technology

[0002] A storage tank airtightness detection device is a specialized piece of equipment used to check for gas leaks in storage tanks (including the tank body, welds, pipe joints, etc.). Its core principle is to create a pressure difference between the tank and the external environment by filling the tank with gas (creating positive pressure) or extracting gas (creating negative pressure). Then, pressure sensors are used to monitor pressure decay, leak detection fluid is applied to the outside of the tank to observe bubbles, or tracer gas is introduced in conjunction with detection instruments to determine the presence and specific location of leaks.

[0003] Existing tank leak detection devices mostly employ a combination of static pressure testing and manual visual inspection or the application of a testing medium (such as water or soap solution). For example, after pressurizing the tank with an air compressor, operators manually apply soap solution to the outer wall and observe the formation of bubbles, or rely on pressure gauges to monitor the pressure decay rate to determine if a leak has occurred. These structures have several problems in actual testing: First, they lack detection accuracy and location capability; minute leaks are unlikely to produce visible bubbles, and the pressure decay method cannot accurately pinpoint the leak point. Second, they are inefficient; manual point-by-point inspection is time-consuming and labor-intensive, and the testing cycle for large tanks is long. Finally, they are highly dependent on the environment and pose a risk of contamination; water or soap solution may contaminate the tank surface or internal media, and the reliability of the results is greatly affected by ambient temperature and wind. These methods fail to meet the demands of modern industry for efficient, accurate, and non-destructive testing. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, one objective of this application is to provide a storage tank airtightness detection device that integrates mobile scanning, smoke tracing and visual inspection technologies to achieve automatic and accurate location of storage tank leaks, improve detection sensitivity and efficiency, and complete non-destructive testing in a closed and clean environment, thus solving the problems of difficult location, low efficiency and pollution caused by traditional methods.

[0006] To achieve the above objectives, a first aspect of this application provides a tank airtightness testing device, comprising a base, an observation chamber, a moving detection mechanism, and a pressure regulating mechanism. The observation chamber is disposed on the base, and the pressure regulating mechanism is disposed on the base and adjacent to the observation chamber. The moving detection mechanism includes a support block, a first driving assembly, and two sets of symmetrically arranged smoke detection components. The first driving assembly is disposed inside the base, and the support block is horizontally movable inside the base via the first driving assembly. The two sets of symmetrically arranged smoke detection components... The smoke detection components are respectively mounted on the support block. The smoke detection components include a connecting pipe, a support pipe, two sets of mist outlet pipes, and two sets of observation components. The base has two parallel strip holes. The support pipe is mounted on the support block and passes through the strip holes, extending into the interior of the observation chamber. The connecting pipe is mounted on the support block and is connected to the support pipe through the support block. The two sets of mist outlet pipes are mounted on the support pipe and are connected to the connecting pipe through the support pipe. The observation components are mounted on the support pipe and are respectively arranged adjacent to the two sets of mist outlet pipes.

[0007] The storage tank air tightness detection device of this application integrates mobile scanning, smoke visualization tracing and visual detection technologies.

[0008] First, by using a mobile high-definition camera to simultaneously capture smoke disturbances, the leak location can be automatically identified and marked, solving the problem of accurate leak point location and completely changing the limitations of traditional manual point-by-point inspection or only being able to determine "whether there is a leak"; Secondly, it significantly improves detection sensitivity and efficiency. Micron-sized smoke particles are extremely sensitive to weak airflow. They move automatically along the tank and can complete a full-surface scan and data collection in a single operation. Simultaneously, it completes visual detection and pressure data recording, eliminating the need for manual point-by-point inspection and effectively improving detection efficiency. Third, it creates a closed, clean, and controllable testing environment. The testing is carried out in a transparent observation chamber, completely isolating it from external wind, temperature, and humidity interference; and it uses trace amounts of non-toxic aerosols as the testing medium, completely avoiding pollution, corrosion, or secondary cleaning problems caused by water, soap, etc. to the tank, thus achieving non-destructive and clean testing and meeting industrial environmental requirements.

[0009] In addition, the tank airtightness testing device proposed in this application may also have the following additional technical features: In one embodiment of this application, the observation component includes two lighting elements and an industrial camera, wherein the industrial camera is disposed on the support tube and located in the middle of a set of mist outlet tubes, and the two lighting elements are disposed on the support tube and located on both sides of the industrial camera and between the set of mist outlet tubes.

[0010] In one embodiment of this application, the first driving component includes a first driving member and a long stud, wherein the long stud is disposed inside the base and passes through the support block and is threadedly connected to the support block, the first driving member is disposed on the base, and the output end of the first driving member is connected to one end of the long stud.

[0011] In one embodiment of this application, the pressure regulating mechanism includes a support frame, a positive pressure component, a negative pressure component, a connecting box, and a pressure relief valve. The support frame is disposed on the upper part of the base, the positive pressure component is disposed inside the support frame, the negative pressure component is disposed inside the support frame and is adjacent to the positive pressure component, the connecting box is disposed on the side of the support frame near the observation chamber and is connected to the positive pressure component and the negative pressure component respectively, and the pressure relief valve is disposed on the side of the observation chamber away from the connecting box.

[0012] In one embodiment of this application, the connecting box is provided with a pressure gauge, the side wall of the connecting box is provided with a first quick-connect flange, the first quick-connect flange is located inside the observation chamber, and the pressure relief valve is provided with a second quick-connect flange, the second quick-connect flange is located inside the observation chamber and is far away from the first quick-connect flange.

[0013] In one embodiment of this application, the negative pressure assembly includes a second driving member, a first connecting pipe, a first one-way valve, and a first switching valve. The second driving member is disposed on the support frame, one end of the first connecting pipe is disposed at the input end of the second driving member, and the other end of the first connecting pipe is connected to the connecting box. The first switching valve is disposed on the first connecting pipe, and the first one-way valve is disposed on the first connecting pipe and located between the first switching valve and the second driving member.

[0014] In one embodiment of this application, the positive pressure assembly includes a third driving member, a second connecting pipe, a second one-way valve, and a second switching valve. The third driving member is disposed on the support frame, one end of the second connecting pipe is disposed at the output end of the third driving member, and the other end of the second connecting pipe is connected to the connecting box. The second switching valve is disposed on the second connecting pipe, and the second one-way valve is disposed on the second connecting pipe and located between the second switching valve and the third driving member.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of a storage tank airtightness testing device according to an embodiment of this application; Figure 2 This is a schematic diagram of the pressure regulating mechanism of a storage tank airtightness testing device according to an embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of a storage tank airtightness testing device according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the positive pressure component and the negative pressure component of the storage tank airtightness detection device according to an embodiment of this application. Figure 5 A smoke detection component of a storage tank airtightness detection device according to an embodiment of this application. A half-section view; Figure 6 for Figure 5 An enlarged schematic diagram of the structure in area A.

[0017] As shown in the figure: 1. Base; 11. Strip hole; 2. Observation chamber; 3. Moving detection mechanism; 31. Bearing block; 32. First drive assembly; 321. First drive component; 322. Long stud; 33. Smoke detection assembly; 331. Connecting pipe; 332. Support pipe; 333. Fog outlet pipe; 334. Observation assembly; 3341. Illumination component; 3342. Industrial camera; 4. Pressure regulating mechanism; 41. Support frame; 42. Positive pressure assembly; 421. Third drive component; 422. Second connecting pipe; 423. Second check valve; 424. Second switching valve; 43. Negative pressure assembly; 431. Second drive component; 432. First connecting pipe; 433. First check valve; 434. First switching valve; 44. Connecting box; 441. Pressure gauge; 442. First quick-connect flange; 45. Pressure relief valve; 451. Second quick-connect flange. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0019] The storage tank air tightness detection device according to an embodiment of this application will be described below with reference to the accompanying drawings.

[0020] The storage tank air tightness detection device provided in this application embodiment can be used to check whether there is gas leakage in the storage tank (including the tank body, welds, pipe interfaces, etc.).

[0021] like Figures 1-6 As shown, the tank airtightness testing device of this application embodiment may include a base 1, an observation chamber 2, a moving testing mechanism 3, and a pressure regulating mechanism 4.

[0022] The observation chamber 2 is mounted on the base 1, and the pressure adjustment mechanism 4 is mounted on the base 1 and is arranged adjacent to the observation chamber 2.

[0023] It should be noted that the base 1 described in this embodiment is a rectangular frame structure with side openings, and support legs are provided at the bottom corners to stably support the observation chamber 2, the moving detection mechanism 3 and the pressure adjustment mechanism 4.

[0024] The mobile detection mechanism 3 includes a support block 31, a first drive assembly 32, and two sets of symmetrically arranged smoke detection assemblies 33.

[0025] The first driving component 32 is disposed inside the base 1, the support block 31 is disposed inside the base 1 by horizontal movement via the first driving component 32, and two sets of symmetrically arranged smoke detection components 33 are respectively disposed on the support block 31.

[0026] It should be noted that the bearing block 31 described in this embodiment has a hollow internal structure. It uses the first driving component 32 to achieve horizontal movement adjustment and slides in contact with the inner upper and inner lower walls of the base 1 to achieve movement limit and support the synchronous movement and adjustment of two symmetrically arranged smoke detection components 33.

[0027] The smoke detection component 33 includes a connecting pipe 331, a support pipe 332, two sets of mist outlet pipes 333, and two sets of observation components 334.

[0028] The base 1 has two parallel strip holes 11. The support tube 332 is mounted on the support block 31 and passes through the strip holes 11, extending into the interior of the observation chamber 2. The connecting tube 331 is mounted on the support block 31 and is connected to the support tube 332 through the support block 31. Two sets of mist outlet tubes 333 are mounted on the support tube 332 and are connected to the connecting tube 331 through the support tube 332. The observation component 334 is mounted on the support tube 332 and is arranged adjacent to the two sets of mist outlet tubes 333.

[0029] It should be noted that the strip hole 11 described in this embodiment is located on the upper wall of the base 1 and inside the observation chamber 2.

[0030] Specifically, by passing through the strip hole 11 of the base 1 through the support tube 332, the physical extension and motion transmission of the support tube 332 from the bearing block 31 to the observation chamber 2 are realized. The connection design of the connecting tube 331, the support tube 332 and the mist outlet tube 333 forms a stable smoke delivery channel from the external smoke source to the tank detection point. The adjacent arrangement of the observation component 334 and the mist outlet tube 333 ensures that the camera and the lighting source can observe the flow state of the smoke after it is ejected in real time and accurately, thus providing a precise and synchronous hardware foundation for the subsequent visual identification and positioning of the leak point.

[0031] To clearly illustrate the previous embodiment, in one embodiment of this application, as follows: Figures 3-6 As shown, the observation component 334 includes two lighting elements 3341 and an industrial camera 3342.

[0032] The industrial camera 3342 is mounted on the support tube 332 and is located in the middle of a set of mist outlet tubes 333. The two lighting elements 3341 are mounted on the support tube 332 and are located on both sides of the industrial camera 3342 and between the set of mist outlet tubes 333.

[0033] It should be noted that the lighting element 3341 proposed in the above embodiment uses LED beads, and two LED beads are distributed on both sides of the industrial camera 3342.

[0034] Specifically, the industrial camera 3342 is precisely positioned between the two sets of mist outlets 333, ensuring that its field of view completely covers the core area where the smoke is emitted. Two illuminators 3341 are symmetrically arranged on either side of the camera, providing shadowless and uniform frontal illumination to this area, effectively enhancing the contrast between the smoke trail and the tank background. This layout ensures that during mobile inspection, the camera can continuously and clearly capture subtle changes in the smoke caused by the disturbance of the leaking airflow, making it a key structural design for achieving high-sensitivity, automated visual inspection.

[0035] Understandably, the industrial camera 3342 and the LED beads can be routed to the outside through the support tube 332, which facilitates the lead-out of the connecting wires and reduces interference with the smoke inside the observation chamber 2.

[0036] In one embodiment of this application, such as Figure 2 , Figure 3 and Figure 6 As shown, the first drive assembly 32 includes a first drive member 321 and a long stud 322.

[0037] The long stud 322 is disposed inside the base 1, passes through the support block 31, and is threadedly connected to the support block 31. The first driving member 321 is disposed on the base 1, and the output end of the first driving member 321 is connected to one end of the long stud 322.

[0038] It should be noted that the first driving component 321 proposed in the above embodiments is a servo motor.

[0039] Specifically, the first driving component 321 drives the long stud 322 to rotate, and the threaded pair converts the rotational motion into the precise linear displacement of the bearing block 31, thereby driving the entire smoke detection unit fixed on it to scan at a constant speed along the axial direction of the tank. The rigid transmission method ensures the accuracy and repeatability of the detection trajectory, which is the fundamental driving force and execution basis for realizing automated, blind-spot-free full-coverage detection.

[0040] In one embodiment of this application, such as Figures 1-4 As shown, the pressure regulating mechanism 4 includes a support frame 41, a positive pressure component 42, a negative pressure component 43, a connecting box 44, and a pressure relief valve 45.

[0041] The support frame 41 is located on the upper part of the base 1, the positive pressure component 42 is located inside the support frame 41, the negative pressure component 43 is located inside the support frame 41 and is adjacent to the positive pressure component 42, the connecting box 44 is located on the side of the support frame 41 near the observation chamber 2 and is connected to the positive pressure component 42 and the negative pressure component 43 respectively, and the pressure relief valve 45 is located on the side of the observation chamber 2 away from the connecting box 44.

[0042] It should be noted that the support frame 41 described in this embodiment is a rectangular frame structure. By integrating the positive pressure component 42 and the negative pressure component 43 into the same support frame 41 and connecting them with a shared connecting box 44, a rapid and compact switching between positive and negative pressure testing modes is achieved. The connecting box 44 serves as a pressure distribution hub, facilitating unified connection to the tested tank. The pressure relief valve 45 is independently located on the other side of the observation chamber 2, forming a safe pressure relief path. This layout not only optimizes space utilization but also ensures the accuracy of pressure application, the convenience of mode switching, and the safety of the testing process.

[0043] In one embodiment of this application, such as Figures 1-4 As shown, a pressure gauge 441 is provided on the connecting box 44, and a first quick-connect flange 442 is provided on the side wall of the connecting box 44. The first quick-connect flange 442 is located inside the observation chamber 2. A second quick-connect flange 451 is provided on the pressure relief valve 45. The second quick-connect flange 451 is located inside the observation chamber 2 and is far away from the first quick-connect flange 442.

[0044] It should be noted that the pressure gauge 441 proposed in the above embodiment enables real-time and intuitive monitoring of the test pressure inside the tank. The first quick-connect flange 442 is located inside the observation chamber 2, facilitating quick connection to the inlet / outlet of the tank under test and simplifying the installation process. The second quick-connect flange 451 is also located inside the chamber but is arranged far away from the first flange, ensuring that the pressure relief path is independent and effective, and can safely and quickly guide the pressure inside the tank to the outside of the chamber in emergencies or after the test. This balances the convenience of testing, process visibility, and operational safety.

[0045] In one embodiment of this application, such as Figures 2-4 As shown, the negative pressure assembly 43 includes a second driving component 431, a first connecting pipe 432, a first one-way valve 433, and a first switching valve 434.

[0046] The second driving component 431 is disposed on the support frame 41, one end of the first connecting pipe 432 is disposed at the input end of the second driving component 431, the other end of the first connecting pipe 432 is connected to the connecting box 44, the first switching valve 434 is disposed on the first connecting pipe 432, and the first one-way valve 433 is disposed on the first connecting pipe 432 and is located between the first switching valve 434 and the second driving component 431.

[0047] It should be noted that the first one-way valve 433 described in this embodiment can enable the connecting box 44 to extract air in the direction of the second driving member 431, and the second driving member 431 is a vacuum pump.

[0048] Specifically, the second driving component 431 serves as a power source and is connected to the connecting box 44 via the first connecting pipe 432 to provide a stable negative pressure environment for the tank. The first switching valve 434 is used to switch the vacuum pipeline on and off to control the start and stop. The first one-way valve 433 is located between the pump and the switching valve. Its key function is to prevent gas from flowing back into the tank when the pump stops or malfunctions, thereby effectively protecting the cleanliness of the tested tank and the safety of the vacuum system.

[0049] In one embodiment of this application, such as Figures 2-4 As shown, the positive pressure assembly 42 includes a third drive element 421, a second connecting pipe 422, a second check valve 423, and a second switching valve 424.

[0050] The third driving component 421 is mounted on the support frame 41. One end of the second connecting pipe 422 is located at the output end of the third driving component 421, and the other end of the second connecting pipe 422 is connected to the connecting box 44. The second switching valve 424 is mounted on the second connecting pipe 422, and the second one-way valve 423 is mounted on the second connecting pipe 422 and located between the second switching valve 424 and the third driving component 421.

[0051] It should be noted that the second one-way valve 423 described in this embodiment is used to deliver air from the output end of the third drive unit 421 to the connecting box 44, and the third drive unit 421 is an air compressor.

[0052] Specifically, the third drive unit 421 serves as a pressure source, delivering compressed gas to the connecting box 44 through the second connecting pipe 422. The second switching valve 424 is used to precisely control the opening and closing of the pressurization process. The second one-way valve 423 is located between the drive unit and the switching valve. Its key function is to prevent the high-pressure gas in the tank from flowing back and impacting the drive equipment when the drive unit stops or the pipeline pressure fluctuates, thereby ensuring the safety of the gas source and maintaining the stability of the test pressure.

[0053] In practical applications, this device is used to test the sealing performance of tank bodies, pipe welds, or joints.

[0054] In specific operation, first place the tank inside the observation chamber 2 and place it on the base 1 to ensure its stability. Use the first quick-connect flange 442 to connect one port of the tank to the connecting box 44, and connect the other port to the pressure relief valve 45 through the second quick-connect flange 451. All other pipe ports must be strictly sealed with blind flanges or pipe caps so that the tank forms a closed system that is only connected to the pressure regulating mechanism 4.

[0055] After the protective door of the observation chamber 2 is closed, the smoke generator is started, and the atomized gas is transported to the mist outlet pipe 333 through the connecting pipe 331, the carrier block 31 and the support pipe 332 to form a uniform and stable smoke curtain. At the same time, the first driving component 321 is started, driving the carrier block 31 to move at a constant speed along the axial direction of the long stud 322, which drives the two sets of symmetrically arranged smoke detection components 33 to scan along the surface of the tank. The mist outlet pipe 333 continuously sprays smoke, and the industrial camera 3342 works synchronously with the lighting components to collect images of the surface of the tank in real time.

[0056] Select either positive or negative pressure mode according to the testing requirements. For positive pressure testing, open the second switch valve 424 and activate the third drive unit 421 to fill the tank with clean gas. Monitor and maintain the set pressure using pressure gauge 441. If a leak occurs, the airflow at the leak point will disturb the smoke outwards, and the industrial camera 3342 will automatically record the abnormal flow. For negative pressure testing, open the first switch valve 434 and activate the second drive unit 431 to extract gas from the tank to the set vacuum level. If a leak occurs, external smoke will be drawn into the leak point, and the industrial camera 3342 will simultaneously capture this phenomenon.

[0057] Throughout the process, pressure and visual data are recorded simultaneously. If the pressure exceeds the safety threshold, the pressure relief valve 45 automatically activates to ensure operational safety. This process achieves standardization and controllability across the entire process, from preparation, scanning, pressurization / vacuuming, detection to safety protection.

[0058] In summary, the tank airtightness detection device of this application integrates mobile scanning, smoke tracing and visual inspection technologies to achieve automatic and accurate location of tank leaks, improve detection sensitivity and efficiency, and complete non-destructive testing in a closed and clean environment, solving the problems of difficult location, low efficiency and pollution of traditional methods.

[0059] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A tank air tightness detection device characterized by comprising: The base, the observation bin, the movement detection mechanism and the pressure adjusting mechanism are included, wherein, The observation bin is arranged on the base; The pressure adjusting mechanism is arranged on the base and adjacent to the observation bin and is in communication with the observation bin; The movement detection mechanism includes a bearing block, a first driving assembly and two groups of symmetrically arranged smoke detection assemblies, wherein, The first driving assembly is arranged inside the base; The bearing block is horizontally movably arranged inside the base through the first driving assembly; Two groups of symmetrically arranged smoke detection assemblies are arranged on the bearing block, and the smoke detection assembly includes a connecting pipe, a supporting pipe, two groups of mist outlet pipes and two groups of observation assemblies, wherein, Two parallel strip-shaped holes are formed on the base; The supporting pipe is arranged on the bearing block and penetrates through the strip-shaped hole and extends to the inside of the observation bin; The connecting pipe is arranged on the bearing block and is in communication with the supporting pipe through the bearing block; Two groups of the mist outlet pipes are arranged on the supporting pipe and are in communication with the connecting pipe through the supporting pipe; The observation assembly is arranged on the supporting pipe and is adjacent to two groups of the mist outlet pipes.

2. The tank tightness detection device according to claim 1, characterized in that, The observation assembly includes two illuminating members and an industrial camera, wherein, The industrial camera is arranged on the supporting pipe and is located at the middle of one group of the mist outlet pipes; Two illuminating members are arranged on the supporting pipe and are located on both sides of the industrial camera and between one group of the mist outlet pipes.

3. The tank tightness detection device according to claim 1, characterized in that, The first driving assembly includes a first driving member and a long stud, wherein, The long stud is arranged inside the base, penetrates through the bearing block and is threadedly connected with the bearing block; The first driving member is arranged on the base, and the output end of the first driving member is connected with one end of the long stud.

4. The tank tightness testing device according to claim 1, characterized in that The pressure adjusting mechanism includes a supporting frame, a positive pressure assembly, a negative pressure assembly, a communication box and a pressure relief valve, wherein, The supporting frame is arranged on the upper part of the base; The positive pressure assembly is arranged inside the supporting frame; The negative pressure assembly is arranged inside the supporting frame and is adjacent to the positive pressure assembly; The communication box is arranged on the side of the supporting frame close to the observation bin and is in communication with the positive pressure assembly and the negative pressure assembly respectively; The pressure relief valve is arranged on the side of the observation bin away from the communication box.

5. The tank tightness detection apparatus according to claim 4, characterized by The communication box is provided with a pressure gauge, the side wall of the communication box is provided with a first quick-connection flange located inside the observation bin, the pressure relief valve is provided with a second quick-connection flange located inside the observation bin and away from the first quick-connection flange.

6. The tank tightness testing apparatus according to claim 1, wherein The negative pressure assembly includes a second driving member, a first communication pipe, a first one-way valve and a first on-off valve, wherein, The second driving member is arranged on the supporting frame; One end of the first communication pipe is connected with the input end of the second driving member, and the other end is in communication with the communication box; The first on-off valve is arranged on the first communication pipe; The first one-way valve is arranged on the first communication pipe and is located between the first on-off valve and the second driving member.

7. The tank tightness testing apparatus according to claim 1, wherein The positive pressure assembly comprises a third driving member, a second communication pipe, a second one-way valve and a second switch valve, wherein, The third driving member is arranged on the support frame; One end of the second communication pipe is connected with an output end of the third driving member, and the other end is communicated with the communication box; The second switch valve is arranged on the second communication pipe; The second one-way valve is arranged on the second communication pipe and located between the second switch valve and the third driving member.

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