Device for detecting sealing performance of heat exchanger

Abstract

The invention relates to the technical field of heat exchanger sealing performance detection, in particular to a heat exchanger sealing performance detection device, which is matched with a helium mass spectrometer leak detector to detect the tube pass sealing performance of a tube type heat exchanger, and comprises a rectangular frame and positioning wheels arranged at four corners of the rectangular frame, two detection mechanisms which are distributed up and down are arranged on the rectangular frame, each detection mechanism comprises a transverse sliding rail, a longitudinal sliding rail and a detection assembly, each detection assembly comprises a first suction gun which swings in a reciprocating mode and a second suction gun which moves along with the first suction gun, the tail end of each first suction gun points to the outer surface of the end of the tube bundle, and each second suction gun elastically moves front and back and extends into the tube bundle. The two suction guns are used for capturing helium in the annular welding position of the heat transfer tube and the tube plate and the interior of the heat transfer tube, so that leakage detection is carried out, detection errors caused by detection distance changes due to the fact that the suction guns are manually held by hands are reduced, and the efficiency of carrying out sealing performance detection on the large tubular heat exchanger is improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger sealing performance testing technology, specifically to a heat exchanger sealing performance testing device. Background Technology

[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. Based on differences in structure and working principle, they are mainly classified into: shell-and-tube heat exchangers, plate heat exchangers, spiral plate heat exchangers, and finned tube heat exchangers, etc.

[0003] Shell-and-tube heat exchangers, also known as tubular heat exchangers, are indirect heat exchangers that use the walls of tube bundles enclosed in a shell as the heat transfer surface. They consist of a shell, heat transfer tube bundles, tube sheets, baffles, and tube boxes. The shell is mostly cylindrical with inlets and outlets on its surface. The tube bundles are installed inside, with both ends fixed to the tube sheets. The tube boxes are located at both ends of the shell and have inlets and outlets for another fluid. The two fluids that exchange heat are the hot and cold fluids. One flows inside the tubes, called the tube-side fluid, and the other flows outside the tubes, called the shell-side fluid.

[0004] Heat exchangers must undergo a sealing test before leaving the factory. Common sealing test methods include water pressure testing, air pressure testing, ultrasonic non-destructive testing, and helium mass spectrometry leak detection. When using a helium mass spectrometer for leak detection, it is generally done manually by holding a suction gun to check the inner end of each heat transfer tube and the weld between the heat transfer tube and the tube sheet. When performing sealing tests on large shell-and-tube heat exchangers, using a handheld suction gun to check hundreds of heat transfer tubes is not only prone to hand fatigue, causing the suction gun to shake and wobble during the movement, which changes the distance between the suction gun and the weld and affects the accuracy of the test results, but also gradually reduces the testing efficiency due to human fatigue. Summary of the Invention

[0005] This invention provides a heat exchanger sealing test device to solve the problems of gradually decreasing detection efficiency due to fatigue and result deviation due to shaking when manually hand-held suction guns are used for helium mass spectrometry leak detection in related technologies.

[0006] This invention provides a heat exchanger sealing performance testing device, which, in conjunction with a helium mass spectrometer leak detector, tests the tube-side sealing performance of a shell-and-tube heat exchanger. The device includes a rectangular frame and positioning wheels located at the four corners of the rectangular frame. Two detection mechanisms are arranged vertically on the rectangular frame. During testing, all four positioning wheels are in contact with the outer wall of the shell of the shell-and-tube heat exchanger.

[0007] The rectangular frame includes two crossbeams and two longitudinal bars. A central shaft is provided at each of the four intersection points of the two crossbeams and the two longitudinal bars, and the positioning wheel is threaded onto the central shaft.

[0008] The detection mechanism includes a transverse slide rail fixedly installed on a crossbeam and a longitudinal slide rail slidably installed on the transverse slide rail. A detection component is slidably installed inside the longitudinal slide rail. The detection component includes a first suction gun that reciprocates and moves along with it, and a second suction gun that moves along with it. The end of the first suction gun points to the outer surface of the tube bundle end, and the second suction gun moves back and forth elastically to extend into the tube bundle.

[0009] A mixture of flue gas and helium is introduced into the inlet on the shell, and the outlet on the shell is blocked so that the flue gas and helium are maintained in the shell side for a period of time. The No. 2 suction gun and the No. 1 suction gun move to accurately detect the leakage of each heat transfer tube and the circumferential weld of each heat transfer tube and tube sheet.

[0010] In one possible implementation, both ends of the crossbeam and the longitudinal bar are provided with strip grooves extending along their own length direction. The central shaft slides through the strip grooves on the intersecting crossbeam and longitudinal bar and extends to both ends. The surface of the central shaft is provided with external threads. The outer wall of each central shaft is threaded with two limiting rings, and the crossbeam and the longitudinal bar are located between the two limiting rings.

[0011] In one possible implementation, the rectangular frame is further provided with an adjustment mechanism, which includes a rectangular shell with open left and right ends, a gear rotatably installed inside the rectangular shell, and racks meshing on the upper and lower sides of the gear. The ends of the two racks that are far apart are respectively sleeved on the outside of two central shafts located diagonally. A handle that slides through the front side of the rectangular shell is fixedly installed at the center of the gear. Support plates for assisting in supporting the upper racks are fixedly installed at the left and right ends of the rectangular shell. A locking element is also provided on the front side of the rectangular shell.

[0012] In one possible implementation, the locking element includes a fixing ring fixed to the front side of the rectangular shell, a positioning ring fixedly installed on the handle, the fixing ring and the positioning ring being coaxial with the gear, and a plurality of circumferentially evenly distributed slots being formed on the circumferential surface of the positioning ring, and locking blocks being connected to the inner wall of the fixing ring by springs, the springs being circumferentially distributed, and the number of locking blocks being less than the number of slots.

[0013] In one possible implementation, the detection assembly includes an upward-opening U-shaped groove and a rotating shaft rotatably mounted between the two side walls of the U-shaped groove. The end of the swing plate closer to the rotating shaft has an embedding groove, and the end of the swing plate farther from the rotating shaft has a notch. A suction gun is fixed in the notch by a locking nut.

[0014] In one possible implementation, when the slot is empty, the end of the swing plate closest to the pivot is raised, and when a counterweight is embedded in the slot, the end of the swing plate furthest from the pivot is raised.

[0015] In one possible implementation, the left-right sliding of the longitudinal slide rail and the up-down sliding of the detection component are both driven by an electric slider, and the U-shaped groove is rotatably connected to the electric slider located in the longitudinal slide rail.

[0016] In one possible implementation, a fixed folding plate is fixedly connected to the lower end of the U-shaped groove, and a second suction gun is elastically slidably connected to the end of the fixed folding plate. The end of the second suction gun corresponds vertically to the end of the first suction gun.

[0017] In one possible implementation, the outer wall of the second suction gun is threaded with a threaded ring, and calibration rods are fixedly installed on the outer wall of the threaded ring and on the left and right sides of the second suction gun. The ends of the calibration rods are rolled with balls, and the ends of the calibration rods are closer to the tube bundle than the second suction gun.

[0018] The above-mentioned one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: The present invention, in conjunction with a helium mass spectrometer leak detector, can automatically detect the tube bundle sealing performance of a shell-and-tube heat exchanger. By locking the nut, the suction gun of one helium mass spectrometer leak detector is fixed to the swing baffle plate, and the suction gun of the other helium mass spectrometer leak detector is elastically installed at the rear end of the fixed baffle plate. When the longitudinal slide rail drives the detection component to move, the two suction guns can capture the helium gas at the annular weld of the heat transfer tube and the tube sheet, as well as inside the heat transfer tube. The helium mass spectrometer leak detector converts the helium gas concentration into an electrical signal. When the concentration exceeds the threshold, it is determined to be a leak point, thereby performing leak detection. This reduces the detection error caused by the change in detection distance due to manual hand-held suction guns and improves the efficiency of sealing performance testing of large shell-and-tube heat exchangers. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a shell-and-tube heat exchanger.

[0020] Figure 2 This is a schematic diagram of the process before the shell-and-tube heat exchanger is tested for sealing performance according to the present invention.

[0021] Figure 3 This is a partial cross-sectional view of the adjusting mechanism of the present invention.

[0022] Figure 4 yes Figure 2 An enlarged schematic diagram of region A in the middle.

[0023] Figure 5 It is a 3D view of the rectangular frame and the testing mechanism.

[0024] Figure 6 This is a partial structural diagram of the testing organization.

[0025] Figure 7 yes Figure 6 Enlarged schematic diagram of region B in the middle.

[0026] In the diagram: 100. Shell and tube heat exchanger; 2. Rectangular frame; 21. Crossbeam; 22. Longitudinal rod; 23. Central shaft; 24. Strip groove; 25. Limiting ring; 3. Positioning wheel; 4. Adjustment mechanism; 41. Rectangular shell; 42. Rack; 43. Gear; 44. Support plate; 45. Handle; 461. Fixing ring; 462. Spring; 463. Locking block; 464. Positioning ring; 5. Detection mechanism; 51. Transverse slide rail; 52. Longitudinal slide rail; 53. U-shaped groove; 54. Swinging folding plate; 541. Embedding groove; 55. No. 1 suction gun; 56. Locking nut; 57. Fixing folding plate; 58. No. 2 suction gun; 59. Threaded ring; 50. Calibration rod. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Please see Figure 1 and Figure 2 A heat exchanger sealing performance testing device, in conjunction with a helium mass spectrometer leak detector (not shown in the figure), is used to test the tube-side sealing performance of a shell-and-tube heat exchanger 100. During the sealing performance test, one tube box of the shell-and-tube heat exchanger 100 needs to be disassembled, exposing one end of the heat transfer tube bundle. A mixture of flue gas and helium is then introduced into the inlet on the shell, and the outlet on the shell is sealed, allowing the flue gas and helium to remain within the shell side for a period of time. A pressure sensor is installed inside the shell inlet or outlet to monitor the internal pressure of the shell in real time. The testing device moves the suction gun on the helium mass spectrometer to detect leaks on the inner wall of each heat transfer tube and at the weld between the heat transfer tube and the tube sheet. When testing the sealing performance of the other end of the heat transfer tube bundle, the previously disassembled tube box is reinstalled, and the other tube box is disassembled to expose the other end of the heat transfer tube bundle to be tested.

[0029] The detection device includes a rectangular frame 2 and positioning wheels 3 located at the four corners of the rectangular frame 2. Two detection mechanisms 5 are arranged vertically on the rectangular frame 2. The positioning wheels 3 have a chamfer at the end facing the shell-and-tube heat exchanger 100. The operator holds the rectangular frame 2 and moves the four positioning wheels 3 along the axial direction of the shell-and-tube heat exchanger 100 until all four positioning wheels 3 are in contact with the outer wall of the shell. Then, the detection mechanism 5 works in coordination with the helium mass spectrometer leak detector to detect the sealing performance of the shell-and-tube heat exchanger 100.

[0030] Please see Figure 2 and Figure 5 The rectangular frame 2 includes two crossbeams 21 and two longitudinal bars 22. A central shaft 23 is provided at each of the four intersection points of the two crossbeams 21 and the two longitudinal bars 22. The positioning wheel 3 is threadedly connected to the central shaft 23. In order to enable the rectangular frame 2 and the positioning wheel 3 to adapt to tube heat exchangers 100 of different diameters, strip grooves 24 extending along their own length are provided at both ends of the crossbeams 21 and the longitudinal bars 22. The central shaft 23 slides through the strip grooves 24 on the intersecting crossbeams 21 and the longitudinal bars 22 and extends to both ends. The surface of the central shaft 23 is provided with external threads. Two limiting rings 25 are threadedly connected to the outer wall of each central shaft 23. The crossbeams 21 and the longitudinal bars 22 are located between the two limiting rings 25 to prevent the crossbeams 21 and the longitudinal bars 22 from detaching from the central shaft 23.

[0031] Please see Figure 2 , Figure 3 and Figure 4 In order to synchronously adjust the spacing between multiple positioning wheels 3 and lock the position of the positioning wheels 3, an adjustment mechanism 4 is also provided inside the rectangular frame 2. The adjustment mechanism 4 includes a rectangular shell 41 with open left and right ends, a gear 43 rotatably installed inside the rectangular shell 41, and a rack 42 meshing with the upper and lower sides of the gear 43. The ends of the two racks 42 that are far apart are respectively sleeved on the outside of two central shafts 23 located diagonally. A handle 45 that slides through the front side of the rectangular shell 41 is fixedly installed at the center of the gear 43. Support plates 44 for assisting in supporting the racks 42 on the upper side are fixedly installed at the left and right ends of the rectangular shell 41. A locking element is also provided on the front side of the rectangular shell 41.

[0032] The locking component includes a fixing ring 461 fixed to the front side of the rectangular shell 41, and a positioning ring 464 fixedly installed on the handle 45. The fixing ring 461, the positioning ring 464 and the gear 43 are coaxial, and the positioning ring 464 has a number of circumferentially evenly distributed slots on its circumferential surface. The inner wall of the fixing ring 461 is connected to a locking block 463 by a spring 462. The spring 462 is circumferentially distributed, and the number of locking blocks 463 is less than the number of slots.

[0033] When the manual handle 45 rotates the gear 43, the racks 42 on both sides of the gear 43 move towards each other. The racks 42 drive the two central shafts 23 on the diagonal to move towards each other, which in turn drives the positioning wheels 3 screwed on the central shafts 23 to move. The two central shafts 23 on the other diagonal move synchronously under the drive of the crossbeam 21 and the longitudinal rod 22, thus forming rectangular frames 2 of different sizes to match the shell and tube heat exchangers 100 of different sizes. The locking element locks the rotation angle of the gear 43. After all the positioning wheels 3 are in contact with the outer wall of the shell and tube heat exchanger 100, the handle 45 is no longer rotated. At this time, the locking block 463 on the locking element is locked in the corresponding slot to lock the positioning ring 464 and the handle 45. In addition, the clamping force between the limiting ring 25 and the corresponding crossbeam 21 or longitudinal rod 22 can be increased by rotating the limiting ring 25, so that the rectangular frame 2 is stably locked on the outside of the shell and tube heat exchanger 100.

[0034] Please see Figure 5 , Figure 6 and Figure 7 The detection mechanism 5 includes a transverse slide rail 51 fixedly mounted on the crossbeam 21 and a longitudinal slide rail 52 slidably mounted on the transverse slide rail 51. A detection component is slidably mounted vertically within the longitudinal slide rail 52. The detection component includes an upward-facing U-shaped groove 53 and a rotating shaft rotatably mounted between the two side walls of the U-shaped groove 53. A swinging baffle 54 is fixedly sleeved on the outside of the rotating shaft. A groove 541 is provided at the end of the swinging baffle 54 closest to the rotating shaft, and a notch is provided at the end of the swinging baffle 54 furthest from the rotating shaft. A first suction gun 55 is fixed within the notch by a locking nut 56. The end of the suction gun 55 points towards the tube bundle. The lower end of the U-shaped groove 53 is fixedly connected to a fixed baffle plate 57. The end of the fixed baffle plate 57 is elastically slidably connected to a second suction gun 58. The end of the second suction gun 58 corresponds vertically to the end of the first suction gun 55. The outer wall of the second suction gun 58 is threadedly connected to a threaded ring 59. The outer wall of the threaded ring 59 and the left and right sides of the second suction gun 58 are fixedly installed with calibration rods 50. The end of the calibration rod 50 is rolled with balls, and the end of the calibration rod 50 is closer to the tube bundle than the second suction gun 58. The radius of the balls is greater than the length of the tube bundle extending out of the tube plate.

[0035] When the slot 541 is empty, the end of the swing plate 54 closest to the pivot is raised. When the counterweight is embedded in the slot 541, the end of the swing plate 54 furthest from the pivot is raised.

[0036] When the first suction gun 55 performs a sealing test on the upper half of the outer ring surface of a heat transfer tube, the second suction gun 58 detects the internal leakage of the heat transfer tube. The first suction gun 55 is used to perform a sealing test on the annular weld between the heat transfer tube and the tube sheet. The helium gas escaping from the leak is captured and sucked into the helium mass spectrometer leak detector for analysis. The vacuum sensor of the helium mass spectrometer leak detector monitors the vacuum level of the mass spectrometer chamber to ensure detection sensitivity and thus accurately locate the leak.

[0037] The second suction gun 58 is inserted into the interior of the heat transfer tube to determine whether the heat transfer tube itself is leaking. Since the heat transfer tube is tested for sealing by water pressure before installation, the second suction gun 58 is only used to test the sealing inside the heat transfer tube to assist in the detection and determine whether the heat transfer tube itself is leaking, rather than to detect the specific leak point like a ring weld.

[0038] It should be noted that the left and right sliding of the longitudinal slide rail 52 and the up and down sliding of the detection component are both driven by an electric slider.

[0039] It should also be noted that the U-shaped groove 53 is rotatably connected to the electric slider located in the longitudinal slide rail 52. In addition to being able to perform inspections row by row from top to bottom, the first suction gun 55 and the second suction gun 58 in the inspection assembly can also perform inspections column by column from left to right, so that the welds of the heat transfer tubes and tube sheets can be fully inspected.

[0040] The detection assembly can move up and down and left and right under the drive of an electric slider. It can also rotate 90 degrees or 180 degrees to ensure that heat transfer tubes near the tube sheet edge can be detected. During the movement of the detection assembly, suction gun 55 contacts the upper surface of the heat transfer tube in the row to be tested. During lateral movement, when suction gun 55 moves between two adjacent heat transfer tubes, it swings downwards under its own weight. As it continues to move, it tilts upwards under the pushing action of the heat transfer tube. This alternating swinging motion performs a sealing test on the upper half of the annular weld between the outer ring surface of each heat transfer tube and the tube sheet. When inspecting the lower half of the annular weld of the heat transfer tube, a counterweight is embedded in the embedding groove 541, causing the first suction gun 55 to tilt upwards and press against the lower surface of the heat transfer tube in the row to be tested. Then the first suction gun 55 moves laterally. When the first suction gun 55 moves between two adjacent heat transfer tubes, the first suction gun 55 swings upwards under the action of the lever. When it continues to move, the first suction gun 55 will swing downwards under the pushing action of the heat transfer tube. This alternating swinging completes the inspection of the lower surface of the heat transfer tube.

[0041] When it is necessary to inspect the left and right halves of the annular weld of the heat transfer tube, rotate the inspection assembly 90 degrees and select whether to embed a counterweight in the embedding groove 541 according to actual needs.

[0042] As the first suction gun 55 moves laterally to perform row-by-row inspections, the second suction gun 58 also moves accordingly. When the ball at the end of the calibration rod 50 touches the heat transfer tube, it first forces the threaded ring 59 and the second suction gun 58 to move backward. Then, the second suction gun 58 returns to its original position under the action of elasticity and contacts the end of the heat transfer tube, continuing to move laterally. When the next ball touches the heat transfer tube again, the second suction gun 58 will move backward again until both calibration rods 50 and the second suction gun 58 return to their original positions under the action of elasticity, thus detecting the leakage inside the heat transfer tube.

[0043] While the first suction gun 55 moves longitudinally to perform column-by-column inspections, the second suction gun 58 will perform a second inspection of the inside of the heat transfer tubes. When inspecting the sealing condition of the heat transfer tubes near the edge of the tube sheet, the inspection range of the second suction gun 58 and the first suction gun 55 can be expanded by rotating the inspection assembly 180 degrees.

[0044] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A heat exchanger sealing performance testing device, characterized in that: The tube-side sealing performance of the shell-and-tube heat exchanger is tested in conjunction with a helium mass spectrometer leak detector. The test includes a rectangular frame and positioning wheels at the four corners of the rectangular frame. Two detection mechanisms are arranged vertically on the rectangular frame. During the test, all four positioning wheels are in contact with the outer wall of the shell-and-tube heat exchanger. The rectangular frame includes two crossbeams and two longitudinal bars. A central shaft is provided at each of the four intersection points of the two crossbeams and two longitudinal bars. The positioning wheel is threaded onto the central shaft. The detection mechanism includes a transverse slide rail fixedly installed on a crossbeam and a longitudinal slide rail slidably installed on the transverse slide rail. A detection component is slidably installed inside the longitudinal slide rail. The detection component includes a first suction gun that reciprocates and moves along with it, and a second suction gun that moves along with it. The end of the first suction gun points to the outer surface of the tube bundle end, and the second suction gun moves back and forth elastically to extend into the tube bundle. A mixture of flue gas and helium is introduced into the inlet on the shell, and the outlet on the shell is blocked so that the flue gas and helium are maintained in the shell side for a period of time. The No. 2 suction gun and the No. 1 suction gun move to accurately detect the leakage of each heat transfer tube and the circumferential weld of each heat transfer tube and tube sheet.

2. The heat exchanger sealing performance testing device according to claim 1, characterized in that: Both ends of the crossbeam and the longitudinal bar are provided with strip grooves extending along their own length direction. The central shaft slides through the strip grooves on the intersecting crossbeam and longitudinal bar and extends to both ends. The surface of the central shaft is provided with external threads. The outer wall of each central shaft is threaded with two limiting rings, and the crossbeam and the longitudinal bar are located between the two limiting rings.

3. The heat exchanger sealing performance testing device according to claim 1, characterized in that: The rectangular frame is also equipped with an adjustment mechanism, which includes a rectangular shell with open ends, a gear rotatably installed inside the rectangular shell, and racks meshing on the upper and lower sides of the gear. The ends of the two racks that are far apart are respectively sleeved on the outside of two central shafts located diagonally. A handle that slides through the front side of the rectangular shell is fixedly installed at the center of the gear. Support plates for assisting in supporting the upper racks are fixedly installed at the left and right ends of the rectangular shell. A locking element is also provided on the front side of the rectangular shell.

4. The heat exchanger sealing performance testing device according to claim 3, characterized in that: The locking component includes a fixing ring fixed to the front side of the rectangular shell, and a positioning ring fixedly installed on the handle. The fixing ring, the positioning ring and the gear are coaxial, and the positioning ring has a number of circumferentially evenly distributed slots on its circumferential surface. The inner wall of the fixing ring is connected to a locking block by a spring. The spring is circumferentially distributed, and the number of locking blocks is less than the number of slots.

5. The heat exchanger sealing performance testing device according to claim 1, characterized in that: The detection assembly includes an upward-facing U-shaped groove and a rotating shaft rotatably mounted between the two side walls of the U-shaped groove. The end of the swing plate closest to the rotating shaft has an embedding groove, and the end of the swing plate far from the rotating shaft has a notch. A suction gun is fixed in the notch by a locking nut.

6. The heat exchanger sealing performance testing device according to claim 5, characterized in that: When the slot is empty, the end of the swing plate closest to the pivot point tilts up; when the counterweight is inserted into the slot, the end of the swing plate furthest from the pivot point tilts up.

7. The heat exchanger sealing performance testing device according to claim 6, characterized in that: The left and right sliding of the longitudinal slide rail and the up and down sliding of the detection component are both driven by an electric slider. The U-shaped groove is rotatably connected to the electric slider located in the longitudinal slide rail, and the detection component can be rotated 90 degrees or 180 degrees.

8. A heat exchanger sealing performance testing device according to claim 5, characterized in that: The lower end of the U-shaped groove is fixedly connected to a fixed folding plate, and the end of the fixed folding plate is elastically slidably connected to a second suction gun. The end of the second suction gun corresponds vertically to the end of the first suction gun.

9. A heat exchanger sealing performance testing device according to claim 8, characterized in that: The outer wall of the second suction gun is threaded with a threaded ring. A calibration rod is fixedly installed on the outer wall of the threaded ring on the left and right sides of the second suction gun. The end of the calibration rod is rolled with a ball, and the end of the calibration rod is closer to the tube bundle than the second suction gun.

Images