Air tightness detection equipment and method for heat exchanger

Abstract

The invention relates to the technical field of air tightness detection of heat exchangers, and particularly discloses an air tightness detection device and method for a heat exchanger, and the device comprises an extrusion plate, a sealing barrel, and a conical pedestal. A telescopic member; a connecting pipe; a detection assembly; and a pipe fitting. In the invention, the air tightness of the heat exchanger is detected by extruding the air into the heat exchanger from outside to inside, so that compared with the air tightness detection by inflating the heat exchanger, impurities in the compressed air can be effectively prevented from entering the heat exchanger to block tiny leakage points, thereby ensuring that the tiny leakage points are normally exposed; therefore, the detection result is relatively accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of air tightness detection of heat exchangers, and in particular to an air tightness detection device and method for heat exchangers. Background Art

[0002] A heat exchanger is a device used to transfer heat from a hot fluid to a cold fluid to meet specified process requirements. It is an industrial application of convective heat transfer and heat conduction.

[0003] During the production and processing of plate heat exchangers, their airtightness needs to be tested. Currently, this is typically done by filling the plate heat exchanger with compressed air and observing the pressure changes by maintaining the pressure to determine if there are leaks. If the compressed air contains impurities (such as solid particles or liquid droplets), these impurities may enter the plate heat exchanger and block tiny leaks, creating the illusion of stable pressure and leading to inaccurate test results. Summary of the Invention

[0004] The purpose of the present invention is to address the shortcomings of the existing technology and provide an air tightness detection device and method for heat exchangers to solve the technical problem that when testing the air tightness by filling compressed air into the plate heat exchanger, the impurities contained in the compressed air may block tiny leakage points, resulting in inaccurate test results.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An air tightness detection device for a heat exchanger, comprising:

[0007] An extrusion plate, a sealing barrel and a conical base, wherein the extrusion plate is movably sleeved in the sealing barrel, the periphery of the extrusion plate is sealed and fitted with the inner wall of the sealing barrel, and the bottom of the sealing barrel is provided with a conical base;

[0008] A telescopic member is installed on the top of the extrusion plate, and the telescopic member is connected to the external mounting bracket;

[0009] Connecting pipes, a plurality of connecting pipes are installed on the extrusion plate, and a plurality of the connecting pipes are connected to a plurality of inlet and outlet ends of the heat exchanger;

[0010] Detection assembly: Several groups of detection assemblies are installed on the top of the extrusion plate. The number of the detection assemblies is the same as the number of the connecting tubes. The detection assembly includes a cylinder, a conduit and a transparent box. The cylinder is connected to the connecting tube. A piston is installed in the cylinder. The cylinder stores color pigment. The color pigment is located above the piston. The top of the cylinder is connected to a conduit. Several transparent boxes are provided on the top of the extrusion plate. Transparent solution is stored in the transparent boxes. The conduit is connected to the transparent boxes.

[0011] Pipe fittings are connected to the sealing barrel.

[0012] As a preferred embodiment of the above technical solution, several guide grooves are longitudinally opened in the cylinder, and several guide blocks are provided on the periphery of the piston. The guide blocks are stuck in the guide grooves, and an elastic member is connected between the guide blocks and the guide grooves. The elastic member makes the piston located at the bottom of the guide groove.

[0013] As a preferred embodiment of the above technical solution, a plurality of wave grooves are longitudinally opened on the inner wall of the sealing barrel, and a plurality of guide blocks are provided on the periphery of the extrusion plate. The guide blocks are slidably installed in the wave grooves, and the contact parts of the guide blocks and the wave grooves are in sealing contact.

[0014] As a preferred embodiment of the above technical solution, several groups of protection components are installed at the bottom of the extrusion plate, and the protection components include conical plates, which are arranged radially along the extrusion plate.

[0015] As a preferred embodiment of the above technical solution, the protective component further includes a scraper, which is fixed to a side of the conical plate close to the inner wall of the sealing barrel, and the scraper is in contact with the inner wall of the sealing barrel.

[0016] As a preferred embodiment of the above technical solution, the protective component also includes a capture net and a storage box. The capture nets are symmetrically installed on both sides of the conical plate, and a condensation sheet is installed on the surface of the conical plate. A storage box is provided at the bottom of the conical plate, a through hole is opened at the top of the storage box, a wedge-shaped base is provided at the bottom of the storage box, and several fixing rods are provided on the top of the conical base, and the fixing rods are used in conjunction with the wedge-shaped base.

[0017] As a preferred embodiment of the above technical solution, a slider is provided on the top of the conical plate, and a plurality of arc grooves are opened on the bottom of the extrusion plate. The slider is slidably installed in the arc groove, and elastic parts 2 are installed between the two sides of the slider and the arc groove.

[0018] A method for using an airtightness testing device for a heat exchanger, the method being applied to the airtightness testing device for a heat exchanger as described above, the method comprising the following steps:

[0019] Step S1: First, the inlet and outlet ends of the heat exchanger are fixedly connected to a plurality of connecting pipes;

[0020] Step S2: The extrusion plate is moved downward into the sealed barrel by extending the telescopic member, and the extrusion plate squeezes the air in the sealed barrel, thereby compressing the air;

[0021] Step S3: If there is a leak in the heat exchanger, compressed air enters the heat exchanger and enters the cylinder through the connecting pipe. The compressed air squeezes the piston, causing the colored pigment above to flow into the transparent box, dyeing the transparent solution into a color. If there is no leak in the heat exchanger, the color of the transparent solution will not change.

[0022] Step S4: After the inspection is completed, the extrusion plate is moved upward by contracting the telescopic member, and air is simultaneously inflated into the sealing barrel through the pipe, completing the entire inspection process.

[0023] The beneficial effects of the present invention are:

[0024] 1. In the present invention, the air tightness of the heat exchanger is tested by squeezing air into the heat exchanger from the outside to the inside. Compared with the method of testing the air tightness by inflating the heat exchanger, this method can effectively prevent impurities in the compressed air from entering the heat exchanger and blocking small leaks, thereby ensuring that the small leaks are properly exposed and the test results are relatively accurate.

[0025] 2. In the present invention, when the extrusion plate enters the sealed barrel and moves downward, the air in the sealed barrel is compressed, and the air temperature gradually rises. The high temperature increases the kinetic energy of the gas molecules, making it easier for the high-pressure air to pass through the tiny leak points on the heat exchanger, thereby accelerating the speed at which the high-pressure air enters the heat exchanger, thereby improving the efficiency of air tightness testing;

[0026] 3. In the present invention, when the extrusion plate moves downward, several guide blocks on the extrusion plate move along several wave grooves, so that the extrusion plate is in a rotating and swinging state when it moves downward. The centrifugal force generated by the swing of the extrusion plate may cause impurities in the compressed air to be thrown to the inner wall of the sealed barrel, rather than gathering near the tiny leakage points of the heat exchanger. At the same time, such swinging also makes it difficult for impurities to stably adhere to the tiny leakage points on the heat exchanger, thereby effectively preventing impurities from clogging the tiny leakage points on the heat exchanger, ensuring that compressed air can enter the heat exchanger through the tiny leakage points, and further ensuring the accuracy of the test results; when the extrusion plate swings, the heat exchanger is also in a swinging state, so the swinging may form a dynamic airflow, pushing the compressed air to pass through the tiny leakage points more easily, thereby accelerating the compressed air to enter the heat exchanger, and further improving the efficiency of air tightness testing;

[0027] 4. In the present invention, the conical plate will drive the capture nets on both sides to swing when it swings. The capture nets will capture water vapor in the compressed air, causing the water vapor to adhere to the capture nets, thereby reducing the humidity of the compressed air. At the same time, the condensing sheets on the conical plate condense the captured water vapor into water droplets, which eventually flow into the storage box along the surface of the capture net or the condensing sheet, thereby further reducing the humidity of the compressed air. Combined with the swing of the heat exchanger itself, the risk of water droplets clogging tiny leaks is reduced, ensuring that the compressed air can enter the heat exchanger through the tiny leaks, further ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 Schematic diagram of the internal structure of the sealed barrel;

[0030] Figure 3 Schematic diagram of the detection component structure;

[0031] Figure 4 This is a schematic diagram of the structure after the extrusion plate and the sealing barrel are separated;

[0032] Figure 5 This is a schematic diagram of the connection structure between the protective component and the extruded plate;

[0033] Figure 6 Schematic diagram of the protection component structure.

[0034] In the picture:

[0035] 1. Telescopic member; 2. Extrusion plate; 21. Guide block; 22. Arc groove; 3. Sealing barrel; 31. Wave groove; 4. Conical base; 5. Connecting pipe; 6. Detection component; 61. Cylinder; 611. Piston; 612. Elastic part 1; 62. Conduit; 63. Transparent box; 7. Protective component; 71. Conical plate; 711. Slider; 712. Elastic part 2; 72. Scraper; 73. Capture net; 74. Storage box; 741. Wedge-shaped base; 8. Fixing rod; 9. Pipe fitting. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] like Figure 1-Figure 3 As shown, an air tightness detection device for a heat exchanger comprises:

[0038] An extrusion plate 2, a sealing barrel 3 and a conical base 4. The extrusion plate 2 is movably sleeved in the sealing barrel 3. The outer periphery of the extrusion plate 2 is sealed and fitted with the inner wall of the sealing barrel 3. The bottom of the sealing barrel 3 is provided with a conical base 4.

[0039] Telescopic member 1, a telescopic member 1 is installed on the top of the extrusion plate 2, and the telescopic member 1 is connected to the external mounting bracket;

[0040] Connecting pipes 5: A plurality of connecting pipes 5 are installed on the extrusion plate 2, and the plurality of connecting pipes 5 are connected to a plurality of inlet and outlet ends of the heat exchanger;

[0041] Detection assembly 6: Several groups of detection assemblies 6 are installed on the top of the extrusion plate 2. The number of detection assemblies 6 is the same as the number of connecting tubes 5. The detection assembly 6 includes a cylinder 61, a conduit 62 and a transparent box 63. The cylinder 61 is connected to the connecting tube 5. A piston 611 is installed in the cylinder 61. The cylinder 61 stores color pigment, which is located above the piston 611. The top of the cylinder 61 is connected to the conduit 62. Several transparent boxes 63 are provided on the top of the extrusion plate 2. Transparent solution is stored in the transparent box 63. The conduit 62 is connected to the transparent box 63;

[0042] Pipe fitting 9 is connected to the sealing barrel 3.

[0043] Furthermore, a plurality of guide grooves are longitudinally opened in the cylinder 61, and a plurality of guide blocks are provided on the periphery of the piston 611. The guide blocks are stuck in the guide grooves, and an elastic member 612 is connected between the guide blocks and the guide grooves. The elastic member 612 makes the piston 611 located at the bottom of the guide groove.

[0044] In actual application of this embodiment, the inlet and outlet ends of the heat exchanger are first fixedly connected to the plurality of connecting pipes 5, and the heat exchanger is fixed. Then, the telescopic member 1 is extended to move the extrusion plate 2 downward into the sealed barrel 3. After the extrusion plate 2 enters the sealed barrel 3, the extrusion plate 2 will squeeze the air in the sealed barrel 3, causing the air to be slowly compressed. If there is a leak in the heat exchanger, the high-pressure gas in the sealed barrel 3 may enter the interior of the heat exchanger through the leak point. When the interior of the heat exchanger is filled with air, the excess air will enter the cylinder 61 through the connecting pipe 5. The high-pressure air slowly pushes the piston 611 upward, and the piston 611 will squeeze the colored pigment above into the transparent box 63 through the conduit 62. The colored pigment will dye the transparent solution, which makes the detection result more obvious. If the transparent solution in the transparent box 63 does not change within a certain period of time, it means that there is no leak in the heat exchanger.

[0045] The air tightness of the heat exchanger is tested by squeezing air into the heat exchanger from the outside to the inside. Compared with testing the air tightness by inflating the heat exchanger, this can effectively prevent impurities in the compressed air from entering the heat exchanger and blocking small leaks, thereby ensuring that small leaks are normally exposed and the test results are relatively accurate. At the same time, it can effectively prevent impurities from damaging the inside of the newly produced heat exchanger.

[0046] When the extrusion plate 2 enters the sealing barrel 3 and moves downward, the air in the sealing barrel 3 is compressed, and the air temperature gradually rises. The high temperature increases the kinetic energy of the gas molecules, making it easier for the high-pressure air to pass through the tiny leak points on the heat exchanger, thereby speeding up the speed at which the high-pressure air enters the heat exchanger, thereby improving the efficiency of air tightness testing;

[0047] By using several groups of detection components 6, several exchange channels on the heat exchanger can be detected simultaneously, and it can be accurately determined which exchange channel is leaking, thereby further improving the efficiency of air tightness detection.

[0048] like Figure 4 As shown, a plurality of wave grooves 31 are longitudinally opened on the inner wall of the sealing barrel 3, and a plurality of guide blocks 21 are provided on the periphery of the extrusion plate 2. The guide blocks 21 are slidably installed in the wave grooves 31, and the contact parts between the guide blocks 21 and the wave grooves 31 are in sealing contact.

[0049] It should be noted that the air in the sealed barrel 3 may also contain impurities, which may block small leaks on the heat exchanger from outside the heat exchanger, preventing compressed air from entering the heat exchanger, thereby causing inaccurate detection results. Therefore, the above solution is proposed to solve this problem.

[0050] In actual application of this embodiment, when the extrusion plate 2 moves downward, the guide blocks 21 on the extrusion plate 2 move along the wave grooves 31, so that the extrusion plate 2 is in a rotating and swinging state when moving downward. The centrifugal force generated by the swing of the extrusion plate 2 may cause impurities in the compressed air to be thrown toward the inner wall of the sealing barrel 3, rather than gathering near the tiny leakage point of the heat exchanger. At the same time, such swinging also makes it difficult for impurities to stably adhere to the tiny leakage point on the heat exchanger, thereby effectively preventing impurities from clogging the tiny leakage point on the heat exchanger, ensuring that the compressed air can enter the heat exchanger through the tiny leakage point, and further ensuring the accuracy of the detection result.

[0051] When the extrusion plate 2 swings, the heat exchanger is also in a swinging state, which may form a dynamic airflow, pushing the compressed air to pass through the tiny leakage point more easily, thereby accelerating the compressed air to enter the heat exchanger and further improving the efficiency of air tightness detection.

[0052] like Figure 5 and Figure 6 As shown, several groups of protection components 7 are installed at the bottom of the extrusion plate 2. The protection components 7 include conical plates 71, and the conical plates 71 are arranged radially along the extrusion plate 2.

[0053] In actual application of this embodiment, dynamic airflow is generated when the heat exchanger swings, and impurities in the compressed air are thrown toward the inner wall of the sealed barrel 3. In this way, the impurities will move toward the conical plate 71 after being thrown out, and the conical plate 71 will also swing with the extrusion plate 2, so that the conical plate 71 will hit the impurities and guide them to the inner wall of the sealed barrel 3, so that the impurities quickly reach the inner wall of the sealed barrel 3, thereby effectively avoiding the impurities from always being near the heat exchanger, thereby reducing the risk of impurities clogging small leakage points, ensuring that compressed air can enter the heat exchanger through the small leakage points, and further ensuring the accuracy of the detection results.

[0054] Furthermore, the protection component 7 further includes a scraper 72 , which is fixed to a side of the conical plate 71 close to the inner wall of the sealing barrel 3 , and the scraper 72 is in contact with the inner wall of the sealing barrel 3 .

[0055] It should be noted that the air in the sealed barrel 3 may have a high humidity. When the air is compressed, a large amount of water vapor will be generated (although the compression process itself does not "generate" water vapor, it will significantly increase the concentration of water vapor in the compressed air and greatly increase the possibility of it precipitating liquid water). If the dew point temperature of the air in the sealed barrel 3 is higher than the surface temperature of the inner wall of the sealed barrel 3, the water vapor will condense into liquid water droplets on the inner wall surface of the sealed barrel 3. If impurities move toward the inner wall of the sealed barrel 3 at this time, the impurities will hit the water droplets and cause them to splash. The splashing water droplets may reach the tiny leak points on the heat exchanger, so that the water droplets may block the tiny leak points, which will also prevent the compressed air from entering the heat exchanger, resulting in inaccurate detection results. For this reason, the above solution is proposed to solve this problem.

[0056] In actual application of this embodiment, the conical plate 71 will mobilize the scraper 72 to swing when it swings. The scraper 72 will scrape off the water droplets attached to the inner wall when it swings along the inner wall of the sealed barrel 3, thereby effectively preventing impurities moving toward the inner wall of the sealed barrel 3 from hitting the water droplets, thereby effectively preventing water droplets from splashing and clogging the tiny leakage points on the heat exchanger, thereby ensuring that the compressed air can enter the heat exchanger through the tiny leakage points, further ensuring the accuracy of the test results; the scraped water droplets will flow along the scraper 72 and drip onto the conical base 4, which effectively prevents the compressed air above from contacting the water droplets again, thereby reducing the humidity of the compressed air near the heat exchanger, reducing the output of water droplets, reducing the risk of water droplets splashing and clogging tiny leakage points, ensuring that the compressed air can enter the heat exchanger through the tiny leakage points, further ensuring the accuracy of the test results.

[0057] Furthermore, the protective component 7 also includes a capture net 73 and a storage box 74. The capture nets 73 are symmetrically installed on both sides of the conical plate 71. Condensation plates are installed on the surface of the conical plate 71. A storage box 74 is provided at the bottom of the conical plate 71. A through hole is opened at the top of the storage box 74. A wedge-shaped base 741 is provided at the bottom of the storage box 74. Several fixing rods 8 are provided on the top of the conical base 4, and the fixing rods 8 are used in conjunction with the wedge-shaped base 741.

[0058] Furthermore, a slider 711 is provided on the top of the conical plate 71 , and a plurality of arc grooves 22 are opened at the bottom of the extrusion plate 2 . The slider 711 is slidably installed in the arc groove 22 , and elastic members 712 are installed between both sides of the slider 711 and the arc groove 22 .

[0059] It should be noted that if the dew point temperature of the air in the sealed barrel 3 is higher than the surface temperature of the heat exchanger, water vapor will condense into liquid water droplets on the surface of the heat exchanger or at small leak points. This will also cause the small leak points to be blocked by water droplets, and the compressed air will also be unable to enter the heat exchanger, resulting in inaccurate detection results. Therefore, the above solution is proposed to solve this problem.

[0060] In actual application of this embodiment, when the conical plate 71 swings, it drives the capture nets 73 on both sides to swing. The capture nets 73 drive the capture of water vapor in the compressed air, causing the water vapor to adhere to the capture nets 73, thereby reducing the humidity of the compressed air. At the same time, the condensing sheets (such as semiconductor refrigeration sheets) on the conical plate 71 condense the captured water vapor into water droplets. The water droplets eventually flow along the capture nets 73 or the surface of the condensing sheets into the storage box 74, thereby further reducing the humidity of the compressed air. In conjunction with the swinging of the heat exchanger itself, the risk of water droplets clogging small leaks is reduced, ensuring that the compressed air can enter the heat exchanger through the small leaks, further ensuring the accuracy of the detection results.

[0061] If impurities move toward the conical plate 71 or the capture net 73, they will be adsorbed on the water droplets and enter the storage box 74 along with the water droplets, thereby reducing the risk of impurities blocking small leaks and ensuring that compressed air can enter the heat exchanger through the small leaks, further ensuring accurate detection results.

[0062] When the extrusion plate 2 moves downward, the air in the sealing barrel 3 is compressed, and the temperature of the compressed air gradually increases, causing the dew point temperature to rise. If the initial humidity of the air is low, this can reduce the formation of liquid water droplets, thereby further reducing the risk of impurities blocking tiny leaks, ensuring that the compressed air can enter the heat exchanger through the tiny leaks, and further ensuring the accuracy of the test results;

[0063] When the conical plate 71 swings, the slider 711 slides in the arc groove 22, and the rebound ability of the second elastic member 712 makes the conical plate 71 reciprocate along the arc groove 22 during the swing, thereby expanding the range of movement of the conical plate 71, the catching net 73 and the scraper 72, thereby enhancing the effect of the conical plate 71, the catching net 73 and the scraper 72;

[0064] When the storage box 74 moves to the fixed rod 8, the fixed rod 8 will push the wedge-shaped base 741 upward, so that the water droplets and impurities in the storage box 74 will flow downward to the conical base 4, and can be discharged through the pipe 9 after the test is completed; in addition, if the amount of air in the sealed barrel 3 is insufficient, the sealed barrel 3 can be inflated through the pipe 9 to ensure the accuracy of the test results.

[0065] A method for using an airtightness testing device for a heat exchanger, the method being applied to the airtightness testing device for a heat exchanger as described above, the method comprising the following steps:

[0066] Step S1: First, the inlet and outlet ends of the heat exchanger are fixedly connected to a plurality of connecting pipes 5;

[0067] Step S2: The extrusion plate 2 is moved downward and extended into the sealing barrel 3 by extending the telescopic member 1. The extrusion plate 2 squeezes the air in the sealing barrel 3, and the air is compressed.

[0068] Step S3: If there is a leak in the heat exchanger, compressed air enters the heat exchanger and enters the cylinder 61 through the connecting pipe 5. The compressed air squeezes the piston 611, causing the colored pigment above to flow into the transparent box 63, dyeing the transparent solution into a color. If there is no leak in the heat exchanger, the color of the transparent solution will not change.

[0069] Step S4: After the detection is completed, the extrusion plate 2 is moved upward by contracting the telescopic member 1, and at the same time, air is inflated into the sealing barrel 3 through the pipe 9 to complete the entire detection process.

[0070] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. An airtightness detection device for a heat exchanger, characterized in that: include: An extrusion plate (2), a sealing barrel (3) and a conical base (4), wherein the extrusion plate (2) is movably sleeved in the sealing barrel (3), the periphery of the extrusion plate (2) is sealed and fitted with the inner wall of the sealing barrel (3), and the bottom of the sealing barrel (3) is provided with a conical base (4); A telescopic member (1), the top of the extrusion plate (2) is provided with the telescopic member (1), and the telescopic member (1) is connected to an external mounting bracket; Connecting pipes (5), a plurality of connecting pipes (5) are installed on the extrusion plate (2), and the plurality of connecting pipes (5) are connected to a plurality of inlet and outlet ends of the heat exchanger; A detection assembly (6), wherein a plurality of detection assemblies (6) are installed on the top of the extrusion plate (2), and the number of the detection assemblies (6) is the same as the number of the connecting pipes (5). The detection assembly (6) comprises a cylinder (61), a conduit (62) and a transparent box (63). The cylinder (61) is connected to the connecting pipe (5). A piston (611) is installed in the cylinder (61). Color pigment is stored in the cylinder (61), and the color pigment is located above the piston (611). The top of the cylinder (61) is connected to the conduit (62). A plurality of transparent boxes (63) are provided on the top of the extrusion plate (2). Transparent solution is stored in the transparent boxes (63), and the conduit (62) is connected to the transparent boxes (63). A pipe fitting (9) is connected to the sealing barrel (3).

2. The airtightness detection device for heat exchangers according to claim 1, characterized in that: A plurality of guide grooves are longitudinally provided in the cylinder (61), and a plurality of guide blocks are provided on the periphery of the piston (611). The guide blocks are clamped in the guide grooves, and an elastic member (612) is connected between the guide blocks and the guide grooves. The elastic member (612) enables the piston (611) to be located at the bottom of the guide groove.

3. The airtightness detection device for heat exchangers according to claim 2, characterized in that: A plurality of wave grooves (31) are longitudinally formed on the inner wall of the sealing barrel (3), and a plurality of guide blocks (21) are provided on the periphery of the extrusion plate (2). The guide blocks (21) are slidably mounted in the wave grooves (31), and the contact portions of the guide blocks (21) and the wave grooves (31) are in sealing contact.

4. The airtightness detection device for heat exchangers according to claim 3, characterized in that: Several groups of protection components (7) are installed at the bottom of the extrusion plate (2). The protection components (7) include conical plates (71). The conical plates (71) are arranged radially along the extrusion plate (2).

5. The airtightness detection device for heat exchangers according to claim 4, characterized in that: The protection assembly (7) further comprises a scraper (72), which is fixed to a side of the conical plate (71) close to the inner wall of the sealing barrel (3), and the scraper (72) is in contact with the inner wall of the sealing barrel (3).

6. The airtightness detection device for heat exchangers according to claim 5, characterized in that: The protective assembly (7) further comprises a capture net (73) and a storage box (74); the capture nets (73) are symmetrically mounted on both sides of the conical plate (71); a condensation sheet is mounted on the surface of the conical plate (71); a storage box (74) is provided at the bottom of the conical plate (71); a through hole is provided at the top of the storage box (74); a wedge-shaped base (741) is provided at the bottom end of the storage box (74); a plurality of fixing rods (8) are provided at the top of the conical base (4); the fixing rods (8) are used in conjunction with the wedge-shaped base (741).

7. The airtightness detection device for heat exchangers according to claim 6, characterized in that: A slider (711) is provided on the top of the conical plate (71), and a plurality of arc grooves (22) are provided on the bottom of the extrusion plate (2). The slider (711) is slidably installed in the arc grooves (22), and elastic members (712) are installed between both sides of the slider (711) and the arc grooves (22).

8. A method for using a device for testing air tightness of a heat exchanger, the method being applied to the device for testing air tightness of a heat exchanger according to any one of claims 1 to 7, the method comprising the following steps: Step S1: First, the inlet and outlet ends of the heat exchanger are fixedly connected to a plurality of connecting pipes (5); Step S2: The extrusion plate (2) is moved downward into the sealing barrel (3) by extending the telescopic member (1), and the extrusion plate (2) squeezes the air in the sealing barrel (3), and the air is compressed; Step S3: If there is a leak in the heat exchanger, compressed air enters the heat exchanger and enters the cylinder (61) through the connecting pipe (5). The compressed air squeezes the piston (611) to make the colored pigment above flow into the transparent box (63), dyeing the transparent solution into a colored color. If there is no leakage in the heat exchanger, the color of the transparent solution will not change; Step S4: After the detection is completed, the extrusion plate (2) is moved upward by contracting the telescopic member (1), and at the same time, air is inflated into the sealing barrel (3) through the pipe member (9), completing the entire detection process.

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