A high-pressure air tightness automatic testing device and method based on a heat exchanger

Abstract

The application discloses a high-pressure air tightness automatic testing device and method based on a heat exchanger and relates to the technical field of air tightness detection devices. The high-pressure air tightness automatic testing device and method based on the heat exchanger, which comprises a shell with a detection table, a control screen fixed on the front face of the shell, a gas cylinder fixed on the shell and a pressing plate fixed on the output end of the gas cylinder, is characterized in that the shell is internally provided with a detection assembly for air tightness detection of the heat exchanger, a feeding assembly for taking and placing dry ice and a transfer assembly for switching the position of the dry ice dug out. The detection assembly comprises a plug and a gas storage cylinder. The plug is provided with a vent hole in communication with the heat exchanger. The gas storage cylinder is fixed in the shell to store helium for detection. The surface of the object to be detected does not need to be specially treated or disassembled, and the use of dye penetration testing will not occur. The surface to be detected needs to be ensured to be clean and free of grease. After testing, the remaining dye and developer also need to be completely cleaned to prevent pollution.

Description

Technical Field

[0001] This invention relates to the field of airtightness testing devices, specifically to an automated high-pressure airtightness testing device and method based on a heat exchanger. Background Technology

[0002] When testing the sealing performance of heat exchangers, helium mass spectrometry leak detectors, hydrostatic tests, or dye penetration tests are commonly used. However, using a helium mass spectrometry leak detector alone can lead to the leakage of a large amount of helium if the leak point on the heat exchanger is large, resulting in high costs. Hydrostatic tests require an extremely large water tank for testing large heat exchangers, increasing site costs, and it is difficult to move the heat exchanger into the tank for testing. Even if it is placed in the tank, it can easily cause problems such as residual internal moisture and rust on metal parts. Dye penetration tests require cleaning of the heat exchanger before and after the test, and they are not effective at detecting small leaks on internal sealing surfaces or in hidden locations.

[0003] For example, the static pressure air tightness testing machine for a heat exchanger used in a hydraulic retarder disclosed in CN118857613B has problems such as being difficult to operate and having high site construction costs during testing, and the difficulty in observing small leaks.

[0004] Therefore, an automated high-pressure airtightness testing device and method based on a heat exchanger is proposed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automated high-pressure airtightness testing device and method based on a heat exchanger, solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automated high-pressure airtightness testing device for heat exchangers, comprising a housing with a testing platform, a control panel fixed to the front of the housing, a cylinder fixed to the housing, and a pressure plate fixed to the output end of the cylinder. The housing contains a testing component for airtightness testing of the heat exchanger, a feeding component for loading and unloading dry ice, and a transfer component for switching the position of the dry ice after loading. The testing component includes:

[0007] The push rod abuts and is fixed inside the housing to provide power to the connected heat exchanger;

[0008] The first fixing plate is fixed to the output end of the push rod;

[0009] The plug is fixed to the top of the first fixing plate and has a vent hole that connects to the heat exchanger.

[0010] The gas cylinder is fixed inside the casing to store helium gas for testing;

[0011] The conversion box is fixed inside the housing to store the dry ice used for testing and to provide a place for the dry ice to change states.

[0012] Preferably, the detection component further includes:

[0013] The first fan, fixed inside the casing, provides power to deliver helium gas into the heat exchanger;

[0014] The second fan, fixed inside the casing, provides power to transport vaporized dry ice smoke into the heat exchanger;

[0015] The water inlet pipe is connected at one end to the side wall of the conversion box to transport water;

[0016] The outlet pipe is connected to the bottom of the conversion box at one end to drain water.

[0017] Preferably, the feeding assembly includes:

[0018] A push plate, slidably installed inside the conversion box, collects dry ice;

[0019] The converging push rod has its output end fixed to the side wall of the push plate, and its other end fixed inside the housing, providing power for the collection of dry ice.

[0020] Preferably, the feeding assembly further includes:

[0021] The sampling push rod, with one end fixed inside the housing, provides power for the operation of the feeding assembly;

[0022] A support plate is fixed to the output end of the sampling push rod;

[0023] The first electromagnet is fixed inside the support plate;

[0024] The first magnet is magnetically connected to the first electromagnet after it is energized;

[0025] The top rod is fixed to one end of the first magnet by its side wall;

[0026] The second fixing plate is fixed to the bottom of the top rod.

[0027] Preferably, the feeding assembly further includes:

[0028] The support rod is fixed at the bottom of the second fixed plate to provide support for the second fixed plate;

[0029] Spring 1, one end is fixed to the bottom of the second fixed plate and is sleeved on the outside of the support rod;

[0030] The positioning plate is fixed to the bottom of the support rod;

[0031] The mounting plate is fixed to the bottom of the positioning plate;

[0032] The movable shaft is hinged to the mounting plate via a torsion spring.

[0033] The sampling box, fixed outside the movable shaft, scoops dry ice from the conversion box.

[0034] Preferably, the feeding assembly further includes:

[0035] A sliding plate is fixed to the side wall of the sampling box to change the tilt angle of the sampling box.

[0036] The sliding rod slides through the positioning plate and transmits the power required for the sampling box to change its angle.

[0037] The connecting rod is fixed at one end to the side wall of the sliding rod;

[0038] The switching plate is fixed to the side wall of the connecting rod;

[0039] The sliding block is slidably installed inside the switching plate;

[0040] Release the push rod; the output end is fixed to the bottom of the sliding block, and the other end is fixed inside the housing.

[0041] By releasing the push rod to move the sliding block, the tilt angle of the sampling box is changed through the switching plate, sliding rod, and connecting rod, so that the dry ice dug out from the two sampling boxes falls into the conversion chamber, mixes with the water transported from the water inlet pipe, and vaporizes into smoke.

[0042] Preferably, the transfer component includes:

[0043] The combined plate is fixed at one end to the side wall of the second fixed plate;

[0044] The switching push rod has one end fixed inside the housing;

[0045] The combination block is fixed on the output end of the switching push rod.

[0046] Preferably, the transfer component further includes:

[0047] The second electromagnet is fixed to the side wall of the assembly block via a guide rail;

[0048] The second magnet is magnetically connected to the second electromagnet after it is energized;

[0049] Spring 2 has one end fixed to the side wall of the assembly block and the other end fixed to the side wall of the second magnet.

[0050] A baffle, with one end fixed to the bottom of the second magnet, works in conjunction with the assembly block to confine the assembly plate within the assembly block, thereby enabling the assembly block to move the sampling box that has been scooped out of dry ice.

[0051] The present invention also provides a detection method applicable to an automated high-pressure airtightness testing device based on a heat exchanger, comprising the following steps:

[0052] S1. Place the heat exchanger to be tested on the housing and fix it by driving the pressure plate with a cylinder;

[0053] S2. Start the detection component to perform an airtightness test on the heat exchanger;

[0054] S3. Start the feeding assembly and transfer assembly, and assist the detection assembly to complete the airtightness test;

[0055] S4. Remove the tested heat exchanger from the casing and replace it with the next heat exchanger to be tested.

[0056] Preferably, the injection rate of dry ice after vaporization is approximately 0.5-5 kg / min, and the injection rate of helium is approximately 20 ml / min-1 L / min.

[0057] This invention provides an automated high-pressure airtightness testing device and method based on a heat exchanger. Compared with the prior art, it has the following advantages:

[0058] (1) The high-pressure airtightness automated testing device and method based on heat exchangers places the heat exchanger to be tested on the shell and controls the airtightness test through the control console. The highly visible smoke formed by the vaporization of dry ice provides visual indication and performs a preliminary macroscopic detection of the leak point of the heat exchanger. After identifying the suspected or larger leak point, a detailed inspection is carried out with helium in conjunction with the detection unit to accurately locate and detect small leaks. After identifying the suspected or larger leak point, a detailed inspection is carried out, which saves raw materials and does not cause long-term pollution to the environment. At the same time, it can detect leak points more quickly and efficiently, especially small leak areas.

[0059] (2) There will be no potential corrosion or damage to the equipment caused by immersing the heat exchanger in water, especially for materials or units that are not suitable for contact with water. There is no need to move large equipment to a specific test environment (such as a water tank). Similarly, there is no need to perform special treatment or disassembly on the surface of the object being tested. There is also no need to use dye penetration testing, which requires ensuring that the surface being tested is clean and free of grease. After the test, it is necessary to thoroughly clean off any residual dye and developer to prevent contamination. Furthermore, there is no need to use toxic gases with great hazards.

[0060] (3) The high-pressure airtightness automated testing device and method based on heat exchanger controls the amount of dry ice obtained by the feeding component when dry ice is about to be used to prepare smoke, which helps to avoid visual interference caused by excessive smoke, while ensuring that there is enough smoke for detection, reducing the chance of operators coming into direct contact with dry ice, reducing the risk of frostbite, and being more friendly to materials or electronic components that are not suitable for contact with water, avoiding potential corrosion or damage risks.

[0061] (4) The high-pressure airtightness automated testing device and method based on heat exchangers enables the take-up box containing dry ice to be transferred from the storage chamber to the conversion chamber by activating the transfer component, thereby realizing the automated take-up of dry ice and release into the conversion chamber. The automated system handles the take-up and transfer of dry ice, reducing the opportunity for operators to directly contact dry ice, reducing frostbite and other safety risks. After setting all movement parameters, it can run continuously without frequent shutdowns for adjustment. It is particularly suitable for the airtightness testing of the first batch of samples before mass production when developing a new model or series of heat exchangers.

[0062] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0063] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0064] Figure 2 This is another perspective view of the overall structure of the present invention;

[0065] Figure 3 This is a schematic diagram of the back of the housing of the present invention;

[0066] Figure 4 This is a side sectional view of the housing of the present invention;

[0067] Figure 5 This is a schematic diagram showing the location of the first fan in this invention;

[0068] Figure 6 This is a cross-sectional view of the conversion box of the present invention;

[0069] Figure 7 This is a schematic diagram showing the position of the positioning plate of the present invention;

[0070] Figure 8 This is a structural diagram of the support plate of the present invention;

[0071] Figure 9 This is a structural diagram of the spring of the present invention;

[0072] Figure 10 This is a schematic diagram of the sampling box of the present invention in its open state;

[0073] Figure 11 This is a schematic diagram showing the position of the second electromagnet of the present invention;

[0074] Figure 12 This is a schematic diagram of the closed state of the sampling box of the present invention.

[0075] In the diagram: 1. Housing; 11. Control panel; 12. Cylinder; 13. Pressure plate; 2. Abutting push rod; 21. First fixing plate; 22. Plug; 23. First fan; 24. Gas storage cylinder; 25. Second fan; 26. Conversion box; 27. Water inlet pipe; 28. Water outlet pipe; 29. ​​Push plate; 210. Summarizing push rod; 3. Sampling push rod; 31. Support plate; 32. First electromagnet; 33. First magnet; 34. Push rod; 35. ... 36. Fixed plate; 37. Support rod; 38. Spring 1; 39. Positioning plate; 30. Mounting plate; 310. Movable shaft; 311. Sampling box; 312. Sliding plate; 313. Combination plate; 314. Switching plate; 315. Connecting rod; 316. Sliding rod; 47. Switching push rod; 48. Combination block; 49. Second electromagnet; 40. Second magnet; 410. Spring 2; 42. Baffle; 43. Sliding block; 44. Release push rod. Detailed Implementation

[0076] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0077] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0078] Please see Figures 1 to 5 The present invention provides the following technical solutions:

[0079] Example 1: A high-pressure airtightness automated testing device based on a heat exchanger includes a housing 1 with a testing platform, a control screen 11 fixedly installed on the front of the housing 1 for displaying the testing process, a cylinder 12 fixedly installed on the housing 1 to provide power for fixing the heat exchanger to be tested, and a pressure plate 13 fixedly installed on the output end of the cylinder 12 for fixing the heat exchanger to be tested. The housing 1 is provided with a testing component for testing the airtightness of the heat exchanger. The testing component includes: an abutment push rod 2, a first fixing plate 21, a plug 22, a first fan 23, a gas storage cylinder 24, a second fan 25, a conversion box 26, a water inlet pipe 27, and a water outlet pipe 28.

[0080] The bottom of the push rod 2 is fixedly installed inside the housing 1. The push rod 2 is used to provide power to the heat exchanger.

[0081] The bottom of the first fixing plate 21 is fixedly installed at the output end of the push rod 2;

[0082] The bottom of the plug 22 is fixedly installed on the top of the first fixing plate 21, and the plug 22 is provided with a vent hole, through which the plug 22 is connected to the heat exchanger.

[0083] The side wall of the first fan 23 is fixedly installed inside the housing 1 by a mounting base. The first fan 23 is used to provide power for delivering helium into the heat exchanger.

[0084] The side wall of the gas storage cylinder 24 is fixedly installed inside the housing 1 for storing helium gas for testing;

[0085] The side wall of the second fan 25 is fixedly installed inside the housing 1 by the mounting base 2. The second fan 25 is used to provide power for conveying vaporized dry ice smoke into the heat exchanger.

[0086] The converter box 26 has two internal cavities, one for storing dry ice and the other for vaporizing dry ice. The bottom of the converter box 26 is fixedly installed inside the housing 1.

[0087] One end of the water inlet pipe 27 is connected to the side wall of the conversion box 26, and the water inlet pipe 27 is used to deliver water into the conversion box 26;

[0088] One end of the water outlet pipe 28 is connected to the bottom of the conversion box 26, and the water outlet pipe 28 is used to drain the water in the conversion box 26.

[0089] When in use, place the heat exchanger to be tested for air tightness on the housing 1. Start the cylinder 12 through the control console. The cylinder 12 drives the pressure plate 13 to press the heat exchanger to be tested, so as to prevent the heat exchanger from shifting during the test and causing the seal to leak. Observe the test process through the control panel 11.

[0090] Furthermore, an additional rubber pad is added to the bottom of the pressure plate 13 to improve the effect of the pressure plate 13 in pressing the heat exchanger.

[0091] After the heat exchanger is fixed by the pressure plate 13, the abutment push rod 2 is activated, which drives the first fixing plate 21 to move. The first fixing plate 21 drives the plug 22 to move upward, so that the plug 22 can block one of the air inlets of the heat exchanger. Then, a piece of dry ice is put into the conversion box 26, and water and dry ice are mixed through the water inlet pipe 27 to make the dry ice vaporize quickly. At the same time, the second fan 25 is activated to transport the vaporized smoke through the air supply pipe and the vent hole opened on the plug 22 to the heat exchanger.

[0092] After the smoke has filled the heat exchanger, another plug 22 is used to block the other air inlet, making the heat exchanger a sealed space. At this time, the smoke continues to be sent into the heat exchanger. If there is a significant leak in the heat exchanger, the smoke will come out from the leak point, which can visually show the larger leak point.

[0093] After a significant leak is detected, the other air inlet of the heat exchanger is opened to allow the smoke inside the heat exchanger to dissipate. The first fan 23 is started and the gas storage cylinder is opened. The first fan 23 delivers helium into the heat exchanger through the delivery pipe and the vent hole on the plug 22. After the helium has spread throughout the heat exchanger, the other air inlet of the heat exchanger is blocked again, creating a sealed space inside the heat exchanger once more. At the same time, the helium detector is moved to the vicinity of the previously detected significant leak. The helium detector is used to detect the helium at the leak point, thereby accurately locating the leak. After identifying suspected or significant leaks, further detailed testing is conducted, saving raw materials and preventing long-term environmental pollution. This method also allows for faster and more efficient detection of leaks, especially in small leak areas.

[0094] Furthermore, instead of simply using plug 22 to block the other air inlet of the heat exchanger, a pressure relief valve is installed on plug 22 so that during the process of delivering smoke or helium into the heat exchanger, it is not necessary to repeatedly insert and remove plug 22 at the other air inlet.

[0095] Please see Figure 1 , Figures 6 to 10 The present invention provides the following technical solutions:

[0096] Example 2, the technical solution of which differs from Example 1 includes: a feeding assembly for picking up and putting down dry ice is provided inside the housing 1, the feeding assembly including: a push plate 29, a collection push rod 210, a sampling push rod 3, a support plate 31, a first electromagnet 32, a first magnet 33, a top rod 34, a second fixing plate 35, a support rod 36, a spring 37, a positioning plate 38, a mounting plate 39, a movable shaft 391, a sampling box 310, and a sliding plate 3101.

[0097] The side wall of the pusher plate 29 is slidably installed inside the conversion box 26, and the pusher plate 29 is used to collect dry ice;

[0098] The output end of the collection push rod 210 is fixedly installed on the side wall of the push plate 29, and the other end of the collection push rod 210 is fixedly installed inside the housing 1. The collection push rod 210 is used to provide power for collecting dry ice.

[0099] One end of the sampling push rod 3 is fixedly installed inside the housing 1. The sampling push rod 3 is used to provide power for the operation of the feeding assembly.

[0100] The bottom of the support plate 31 is fixedly installed on the output end of the sampling push rod 3;

[0101] The side wall of the first electromagnet 32 ​​is fixedly installed inside the support plate 31;

[0102] The side wall of the first magnet 33 is magnetically connected to the first electromagnet 32 ​​after it is energized, and one end of the first magnet 33 is fixedly installed on the side wall of the top rod 34.

[0103] The side wall of the push rod 34 is fixedly connected to one end of the first magnet 33;

[0104] The second fixing plate 35 is fixedly installed at the bottom of the top rod 34;

[0105] The top of the support rod 36 is fixedly installed on the bottom of the second fixed plate 35, and the support rod 36 is used to provide support for the second fixed plate 35;

[0106] One end of spring 37 is fixedly installed at the bottom of the second fixed plate 35, spring 37 is slidably sleeved on the outside of the support rod 36, and the other end of spring 37 is fixedly installed at the top of the positioning plate 38. Spring 37 is used for buffering.

[0107] The top of the positioning plate 38 is fixedly installed on the bottom of the support rod 36;

[0108] The top of the mounting plate 39 is fixedly mounted on the bottom of the positioning plate 38;

[0109] Both ends of the movable shaft 391 are hinged to the side wall of the mounting plate 39 by torsion springs;

[0110] The sampling box 310 is fixedly installed outside the movable shaft 391, and the sampling box 310 is used to scoop dry ice from the conversion box 26.

[0111] One end of the sliding plate 3101 is fixedly installed on the side wall of the sampling box 310. The sliding plate 3101 and the sliding rod 314 cooperate to change the tilt angle of the sampling box 310.

[0112] The feeding assembly also includes: a switching plate 312, a connecting rod 313, a sliding rod 314, a sliding block 46, and a release push rod 47;

[0113] The side wall of the switching plate 312 is fixedly installed on the side wall of the connecting rod 313;

[0114] One end of the connecting rod 313 is fixedly installed on the side wall of the sliding rod 314;

[0115] One end of the sliding rod 314 is slidably inserted into the positioning plate 38. The sliding rod 314 is used to transmit the power required for the sampling box 310 to change its angle.

[0116] The sliding block 46 is T-shaped, and one end of the sliding block 46 slides through the switching plate 312.

[0117] The output end of the release push rod 47 is fixedly installed at the bottom of the sliding block 46, and the other end of the release push rod 47 is fixedly installed inside the housing 1.

[0118] In use, when dry ice is about to be used to prepare smoke, the sampling push rod 3 is activated, which drives the support plate 31 to move. The support plate 31 drives the first electromagnet 32 ​​to move. The first electromagnet 32 ​​and the first magnet 33 are magnetically connected, so that the first electromagnet 32 ​​can drive the first magnet 33 to move synchronously. The first magnet 33 drives the top rod 34 to move. The top rod 34 drives the second fixing plate 35 to move. The second fixing plate 35 drives the support rod 36 to move. The support rod 36 drives the positioning plate 38 to move. The positioning plate 38 drives the mounting plate 39 to move. The mounting plate 39 drives the sampling box 310 to move synchronously through the movable shaft 391, so that the sampling box 310 located in the digging position extends into the storage cavity of the conversion box 26. When the sampling push rod 3 is activated, the release push rod 47 is also activated synchronously and keeps the movement distance of the sampling push rod 3 synchronized.

[0119] When the sampling box 310 moves into position, the release push rod 47 is activated independently via the control console. The release push rod 47 causes the sliding block 46 to move downwards. The sliding block 46 and the switching plate 312 slide and adapt to each other, allowing the switching plate 312 to move horizontally along the sliding block 46 under external force. Simultaneously, the sliding block 46 causes the switching plate 312 to move vertically. When the sliding block 46 moves, it synchronously moves the switching plate 312, which in turn moves the connecting rod 313. The sliding rod 314 is moved, and when it moves, it passes through the positioning plate 38 and squeezes the sliding plate 3101. Under the action of external force, the sliding plate 3101 drives the sampling box 310 to rotate around the movable shaft 391. The sampling boxes 310 on both sides of the positioning plate 38 rotate synchronously, completing the scooping of dry ice in the storage cavity of the conversion box 26. After the scooping of dry ice is completed, the collection push rod 210 is activated, which drives the push plate 29 to move. The push plate 29 squeezes the remaining dry ice in the storage cavity and collects it at the scooping position.

[0120] The sampling box 310 is then moved to the release position in the switching cavity. The release push rod 47 is then used to move the sliding block 46 upwards, preventing the sliding block 46 from exerting a downward force on the switching plate 312. This prevents the switching plate 312 from exerting a downward force on the sliding rod 314. At this point, the sampling box 310, under the action of the torsion spring, returns to its open state with the movable shaft 391 as its axis. Figure 10 As shown, water is injected into the conversion chamber through the water inlet pipe 37, which mixes with the dry ice and accelerates the generation of smoke.

[0121] Please see Figures 11 to 12 The present invention provides the following technical solutions:

[0122] Example 3, the technical solution of which differs from Example 2 is as follows: a transfer assembly for switching the position of dry ice after digging is provided inside the housing 1. The transfer assembly includes: a combination plate 311, a switching push rod 4, a combination block 41, a second electromagnet 42, a second magnet 43, a second spring 44, and a baffle 45.

[0123] One end of the combination plate 311 is fixedly installed on the side wall of the second fixing plate 35;

[0124] One end of the switching push rod 4 is fixedly installed inside the housing 1, and the output end of the switching push rod 4 is fixedly connected to the bottom of the assembly block 41;

[0125] The side wall of the second electromagnet 42 is fixedly connected to the top of the guide rail, and one end of the guide rail is fixedly installed on the side wall of the assembly block 41.

[0126] The second magnet 43 is magnetically connected to the energized second electromagnet 42;

[0127] One end of the second spring 44 is fixedly installed on the side wall of the assembly block 41, and the other end of the second spring 44 is fixed on the side wall of the second magnet 43.

[0128] One end of the baffle 45 is fixedly installed at the bottom of the second magnet 43. The baffle 45 is approximately L-shaped and one end of the baffle 45 slides through the guide rail.

[0129] The combination block 41 and the baffle 45 cooperate to restrict the position of the combination plate 311.

[0130] In use, after the sampling box 310 has taken dry ice, the sampling push rod 3 and the release push rod 47 are moved upward synchronously by controlling the sampling push rod 3 and the release push rod 47 until the top rod 34 is inserted into the support plate 31. The first electromagnet 32 ​​is de-energized, so that the first electromagnet 32 ​​and the first magnet 33 are separated. At this time, the combination plate 311 is inserted into the combination block 41. Then, the second electromagnet 42 is energized, so that the second electromagnet 42 and the second magnet 43 are magnetically connected. The second magnet 43 moves to the side where the second electromagnet 42 is located. The second magnet 43 drives the baffle 45 to move synchronously. The baffle 45 slides and adapts to the guide rail, so that the baffle 45 can only move in a straight line along the guide rail under the action of external force until the second magnet 43 and the second electromagnet 42 are completely magnetically attracted together. At this time, the baffle 45 passes through the bottom of the combination plate 311, thereby restricting the top rod in the combination block 41.

[0131] At this time, the switching push rod 4 is activated, which drives the combination block 41 to move. The combination block 41 drives the combination plate 311 and the top rod 34 to move synchronously through the guide rail and the baffle 45, so that the take-out box 310 containing dry ice can be transferred from the storage cavity to the conversion cavity. During the transfer, the sliding block 46 and the switching plate 312 slide and adapt to each other, so that the switching plate 312 moves in a straight line along the sliding block 46 until the take-out box 310 is transferred to the release position and stops.

[0132] After the sampling box 310 is transferred from the digging position to the release position, the control release push rod 47 is activated again. The release push rod 47 drives the sliding block 46 to move upward, so that the switching plate 312 can no longer apply downward force to the sliding rod 414. At this time, the sampling box 310 is reset to the open state with the movable shaft 391 as the axis under the action of the torsion spring. At this time, water is injected into the conversion chamber through the water inlet pipe 27, which can mix with dry ice and accelerate the generation of smoke. By controlling the opening degree of the sampling box 310, the amount of dry ice falling from the sampling box 310 into the conversion chamber can be controlled, thereby controlling the speed and amount of atomization after the dry ice comes into contact with water.

[0133] After the dry ice in the sampling box 310 is released, the sampling box 310 is reset to the extraction position to await the next test. Figure 7 The location shown;

[0134] In another embodiment, which differs from the aforementioned embodiment, a nozzle is installed in each of the two sampling boxes 310. When the dry ice is completely released into the conversion chamber, the nozzle sprays air to blow the dry ice in the sampling box 310 completely into the conversion chamber.

[0135] This invention also provides a detection method suitable for an automated high-pressure airtightness testing device based on a heat exchanger, comprising the following steps:

[0136] S1. Place the heat exchanger to be tested on the housing 1, and fix it by driving the pressure plate 13 through the cylinder 12;

[0137] S2. Start the detection component to perform an airtightness test on the heat exchanger;

[0138] S3. Start the feeding assembly and transfer assembly, and assist the detection assembly to complete the airtightness test;

[0139] S4. Remove the tested heat exchanger from housing 1 and replace it with the next heat exchanger to be tested.

[0140] The injection rate of dry ice after vaporization is approximately 0.5-5 kg / min, while the injection rate of helium is approximately 20 ml / min-1 L / min.

[0141] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0142] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0143] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0144] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure airtightness automated testing device based on a heat exchanger, comprising a housing (1) with a testing platform, a control panel (11) fixed to the front of the housing (1), a cylinder (12) fixed to the housing (1), and a pressure plate (13) fixed to the output end of the cylinder (12), characterized in that, The housing (1) is provided with a detection component for airtightness testing of the heat exchanger, a feeding component for loading and unloading dry ice, and a transfer component for switching the position of the dry ice after it has been removed. The detection component includes: The push rod (2) is fixed inside the housing (1) to provide power to the heat exchanger. The first fixing plate (21) is fixed to the output end of the push rod (2); The plug (22) is fixed to the top of the first fixing plate (21) and has a vent hole that communicates with the heat exchanger; A gas storage cylinder (24) is fixed inside the casing (1) to store helium for testing; The conversion box (26) is fixed inside the housing (1) to store the dry ice for testing and to provide a place for the dry ice to change state.

2. The automated high-pressure airtightness testing device based on a heat exchanger according to claim 1, characterized in that, The detection component also includes: The first fan (23) is fixed inside the casing (1) to provide power for delivering helium into the heat exchanger; The second fan (25) is fixed inside the casing (1) to provide power for conveying vaporized dry ice smoke into the heat exchanger; The water inlet pipe (27) is connected at one end to the side wall of the conversion box (26) to transport water; The water outlet pipe (28) is connected at one end to the bottom of the conversion box (26) to discharge water.

3. The high-pressure airtightness automated testing device based on a heat exchanger according to claim 1, characterized in that, The feeding assembly includes: The push plate (29) is slidably installed inside the conversion box (26) to collect dry ice; The converging push rod (210) has its output end fixed on the side wall of the push plate (29) and its other end fixed inside the housing (1) to provide power for the collection of dry ice.

4. The automated high-pressure airtightness testing device based on a heat exchanger according to claim 1, characterized in that, The feeding assembly also includes: The sampling push rod (3) is fixed at one end inside the housing (1) to provide power for the operation of the feeding assembly; The support plate (31) is fixed to the output end of the sampling push rod (3); The first electromagnet (32) is fixed inside the support plate (31); The first magnet (33) is magnetically connected to the first electromagnet (32) after it is energized; The top rod (34) has its sidewall fixed to one end of the first magnet (33); The second fixing plate (35) is fixed to the bottom of the top rod (34).

5. The automated high-pressure airtightness testing device based on a heat exchanger according to claim 4, characterized in that, The feeding assembly also includes: The support rod (36) is fixed at the bottom of the second fixed plate (35) to provide support for the second fixed plate (35); Spring 1 (37) is fixed at one end to the bottom of the second fixed plate (35) and sleeved on the outside of the support rod (36); The positioning plate (38) is fixed to the bottom of the support rod (36); Mounting plate (39) is fixed to the bottom of positioning plate (38); The movable shaft (391) is hinged to the mounting plate (39) by a torsion spring; The sampling box (310), fixed outside the movable shaft (391), scoops dry ice from the conversion box (26).

6. The automated high-pressure airtightness testing device based on a heat exchanger according to claim 5, characterized in that, The feeding assembly also includes: The sliding plate (3101) is fixed on the side wall of the sampling box (310) to change the tilt angle of the sampling box (310); The sliding rod (314) slides through the positioning plate (38) and transmits the power required for the sampling box (310) to change its angle. One end of the connecting rod (313) is fixed to the side wall of the sliding rod (314); The switching plate (312) is fixed to the side wall of the connecting rod (313); The sliding block (46) is slidably installed inside the switching plate (312); Release the push rod (47), with the output end fixed to the bottom of the sliding block (46) and the other end fixed inside the housing (1).

7. The automated high-pressure airtightness testing device based on a heat exchanger according to claim 1, characterized in that, The transfer component includes: The combined plate (311) is fixed at one end to the side wall of the second fixed plate (35); The switching push rod (4) is fixed at one end inside the housing (1); The combination block (41) is fixed on the output end of the switching push rod (4).

8. The high-pressure airtightness automated testing device based on a heat exchanger according to claim 1, characterized in that, The transfer component also includes: The second electromagnet (42) is fixed to the side wall of the assembly block (41) via a guide rail; The second magnet (43) is magnetically connected to the second electromagnet (42) after it is energized; Spring 2 (44) has one end fixed to the side wall of the assembly block (41) and the other end fixed to the side wall of the second magnet (43); The baffle (45) is fixed at one end to the bottom of the second magnet (43).

9. A testing method applicable to the automated high-pressure airtightness testing device based on a heat exchanger as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Place the heat exchanger to be tested on the housing (1) and fix it by driving the pressure plate (13) through the cylinder (12); S2. Start the detection component to perform an airtightness test on the heat exchanger; S3. Start the feeding assembly and transfer assembly, and assist the detection assembly to complete the airtightness test; S4. Remove the heat exchanger that has been tested from the housing (1) and replace it with the next heat exchanger to be tested.

10. The detection method of the automated high-pressure airtightness testing device based on a heat exchanger according to claim 9, characterized in that, The injection rate of dry ice after vaporization is approximately 0.5-5 kg / min, while the injection rate of helium is approximately 20 ml / min-1 L / min.

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