Air tightness detection equipment for heat exchange tube

Abstract

The utility model discloses air tightness detection equipment for a heat exchange tube, which comprises a water tank, a group of lifting assemblies, an adjusting assembly, a first interface assembly and a second interface assembly, one lifting assembly is fixed at one end in the water tank, and the other lifting assembly is arranged at the other end in the water tank through the adjusting assembly; the first connector assembly and the second connector assembly are arranged on the lifting assembly, the two ends of the heat exchange pipe are connected with the first connector assembly and the second connector assembly respectively, and the first connector assembly and / or the second connector assembly are / is connected with an air source. According to the utility model, the first joint and the second joint are arranged, and the spring is matched with the top ring, so that the detection of heat exchange tubes with different lengths is overcome. Through cooperation of the fixing part and the pressing part, the sealing ring is deformed outwards in an extrusion mode, sealing of the sealing ring and the heat exchange tube is achieved, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of heat exchange tube detection, in particular to an air tightness detection device for heat exchange tubes. Background Art

[0002] Heat exchange tubes are manufactured using a roller-cut process, so damage is inevitable. Therefore, they require airtightness testing after production. If untested heat exchange tubes are put into service directly, cracks may develop, leading to refrigerant leaks. To improve efficiency, multiple tubes are typically inspected. However, since each tube is of varying length, using existing joints cannot guarantee a complete seal between each tube and the joint, potentially leading to false positives. Utility Model Content

[0003] In view of the defects of the above-mentioned prior art, the main purpose of the present invention is to overcome the shortcomings of the prior art and discloses an air tightness detection device for a heat exchange tube, comprising a water tank, a set of lifting components, an adjustment component, a first interface component and a second interface component, one of the lifting components is fixed at one end in the water tank, the other lifting component is arranged at the other end in the water tank through the adjustment component, the first interface component and the second interface component are respectively arranged on the lifting components, the two ends of the heat exchange tube are respectively connected to the first interface component and the second interface component, and the first interface component and / or the second interface component are connected to an air source;

[0004] The first interface assembly includes a fixing seat assembly and at least one first connector; the second interface assembly includes the fixing seat assembly and at least one second connector; the number of the first connectors and the number of the second connectors correspond.

[0005] Furthermore, the lifting assembly includes a guide bracket, a first cylinder and a lifting plate, the lifting plate is slidably arranged on the guide bracket, the first interface assembly is arranged on the lifting plate, the first cylinder is arranged on the guide bracket, and the first cylinder is connected to the lifting plate.

[0006] Furthermore, the adjusting assembly includes a first guide rod, a second cylinder, an adjusting plate, a fixed plate, a screw rod and a handwheel, the first guide rod is arranged in parallel on both sides of the water tank, the fixed plate is arranged at one end of the water tank, a lifting assembly and the adjusting plate are horizontally slidably arranged on the first guide rod, the screw rod is arranged parallel to the first guide rod, the screw rod is threadedly engaged with the fixed plate, the two ends of the screw rod are respectively connected to the adjusting plate and the handwheel, the second cylinder is arranged on the adjusting plate, and the second cylinder is connected to the lifting assembly.

[0007] Furthermore, the fixed seat assembly includes a fixed bracket, a third cylinder and a traction plate, the fixed bracket is provided with a first connecting hole that cooperates with the first joint and the second joint, the third cylinder is provided on the fixed bracket, the piston rod of the third cylinder is connected to the traction plate, the traction plate is provided with a second connecting hole that cooperates with the first joint and the second joint, and the first joint and the second joint are controlled by the third cylinder through the traction plate.

[0008] Furthermore, the first joint includes a first body, a top ring, a spring, a first sealing ring and a first pull rod, the first body is axially penetrated by a first guide portion and a first accommodating chamber, the first accommodating chamber is axially protruded by a first fixing portion; the top ring is arranged in the first accommodating chamber through the spring, and the top ring is sleeved on the first fixing portion, the first pull rod is slidably arranged on the first guide portion, one end of the first pull rod is radially protruded by a first clamping portion, the sealing ring is sleeved on the first pull rod, and the sealing ring is located between the first fixing portion and the first clamping portion; the pull rod is axially provided with an air inlet.

[0009] Furthermore, an external thread is provided on the outside of the first body.

[0010] Furthermore, at least two nuts are provided on the first pull rod, and the nuts are threadably engaged with the outer wall of the first pull rod.

[0011] Furthermore, the second joint includes a second body, a second sealing ring and a second pull rod, the second body is axially penetrated by a second guide portion and a second accommodating cavity, and the second accommodating cavity is axially protruded by a second fixing portion; the second pull rod is slidably arranged on the second guide portion, and a second clamping portion is radially protruded at one end of the second pull rod, the sealing ring is sleeved on the second pull rod, and the sealing ring is located between the second fixing portion and the second clamping portion.

[0012] Furthermore, a positioning plate is provided on the fixing bracket, and a positioning groove is recessed on the surface of the positioning plate, and the positioning groove corresponds to the first joint and the second joint.

[0013] Furthermore, rounded corners are provided between adjacent positioning grooves.

[0014] Beneficial effects achieved by this utility model:

[0015] The utility model overcomes the problem of detecting heat exchange tubes of different lengths by configuring a first joint and a second joint, using a spring and a top ring. The fixing portion and the pressing portion cooperate to squeeze the sealing ring outward, achieving a seal with the heat exchange tube. The structure is simple and easy to operate. A positioning plate is provided, and a positioning groove is provided on the positioning plate. The edges of the positioning groove are rounded to ensure automatic alignment of the heat exchange tube with the first joint and the second joint, while preventing wear on the heat exchange tube surface caused by sharp corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of an air tightness detection device for heat exchange tubes according to the present invention;

[0017] Figure 2 Schematic diagram of the cooperation between the lifting assembly and the first interface assembly;

[0018] Figure 3 A schematic diagram of the structure of the cooperation between the lifting assembly, the adjustment assembly and the second interface assembly;

[0019] Figure 4 is a schematic diagram of the combination of the fixing seat assembly and the first joint;

[0020] Figure 5 for Figure 4 A schematic diagram of a first joint assembly structure is hidden in the figure;

[0021] Figure 6 is a schematic diagram of the three-dimensional structure of the first joint;

[0022] Figure 7 Schematic diagram of the internal structure of the first joint;

[0023] Figure 8 is a schematic diagram of the three-dimensional structure of the second joint;

[0024] Figure 9 Schematic diagram of the internal structure of the second joint;

[0025] Figure 10 Schematic diagram of the cooperation between the heat exchange tube and the first joint and the second joint;

[0026] The reference numerals are as follows:

[0027] 1. Water tank, 2. Lifting assembly, 3. Adjusting assembly, 4. First interface assembly, 5. Second interface assembly, 6. Fixed seat assembly, 9. Heat exchange tube, 21. Guide bracket, 22. First cylinder, 23. Lifting plate, 31. First guide rod, 32. Second cylinder, 33. Adjusting plate, 34. Fixed plate, 35. Screw, 36. Handwheel, 41. First joint, 411. First body, 412. Top ring, 413. Spring, 414. First sealing ring, 415. First pull rod, 4111. First guide part, 4 112. First accommodating chamber, 4113. First fixing portion, 4151. First pressing portion, 4152. Air inlet, 51. Second joint, 511. Second body, 512. Second sealing ring, 513. Second pull rod, 5111. Second guide portion, 5112. Second accommodating chamber, 5113. Second fixing portion, 5131. Second pressing portion, 61. Fixed bracket, 62. Third cylinder, 63. Pulling plate, 64. Positioning plate, 611. First connecting hole, 631. Second connecting hole, 641. Positioning groove. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] A device for detecting the air tightness of heat exchange tubes 9, such as Figures 1-10 As shown, the system includes a water tank 1, a set of lifting assemblies 2, an adjustment assembly 3, a first interface assembly 4, and a second interface assembly 5. One lifting assembly 2 is fixed at one end of the water tank 1, and the other lifting assembly 2 is positioned at the other end of the water tank 1 via the adjustment assembly 3. The first interface assembly 4 and the second interface assembly 5 are respectively positioned on the lifting assembly 2. The first interface assembly 4 and / or the second interface assembly 5 are connected to an air source. During testing, the ends of the heat exchange tube 9 are respectively connected to the first interface assembly 4 and the second interface assembly 5. Specifically, the ends of the heat exchange tube 9 are first supported on the first interface assembly 4 and the second interface assembly 5. The adjustment assembly 3 controls the second interface assembly 5 to move toward the first interface assembly 4. During this process, the ends of the heat exchange tube 9 are inserted into the first interface assembly 4 and the second interface assembly 5 to achieve a seal. The heat exchange tube 9 is then immersed in the water of the water tank via the lifting assembly 2. The air source is then introduced into the heat exchange tube 9. The air bubbles in the water are observed to determine whether there is a leak. The air source can be connected to only the first interface assembly 4 or the second interface assembly 5, or it can be connected to both the first interface assembly 4 and the second interface assembly 5.

[0030] The first interface assembly 4 includes a fixing base assembly 6 and at least one first joint 41; the second interface assembly 5 includes a fixing base assembly 6 and at least one second joint 51. The first joints 41 and second joints 51 are provided in equal numbers. The first joints 41 and second joints 51 are respectively connected to the ends of the heat exchange tube 9. The number of first joints 41 and second joints 51 is set according to actual needs. In this embodiment, six first joints 41 and six second joints 51 are provided. The first joints 41 and second joints 51 are sealed to the ends of the heat exchange tube 9.

[0031] In one embodiment, if Figures 1-10 As shown, the lifting assembly 2 includes a guide bracket 21, a first cylinder 22, and a lifting plate 23. The lifting plate 23 is slidably arranged on the guide bracket 21, and the lifting plate 23 is guided to move vertically by the guide bracket 21. The first interface assembly 4 is arranged on the lifting plate 23, and the first cylinder 22 is arranged on the guide bracket 21. The piston rod of the first cylinder 22 is connected to the lifting plate 23, and the lifting plate 23 is driven up and down by the first cylinder 22. This controls the heat exchange tube 9 to be immersed in the water of the water tank 1. Among them, the guide bracket 21 includes an upper bracket, a lower bracket and two guide rods. The upper bracket and the lower bracket are arranged parallel to each other, and the two guide rods are arranged vertically and parallel between the upper bracket and the lower bracket.

[0032] In one embodiment, if Figures 1-10 As shown, the adjustment assembly 3 includes a first guide rod 31, a second cylinder 32, an adjustment plate 33, a fixed plate 34, a screw 35, and a handwheel 36. The first guide rod 31 is arranged parallel to both sides of the water tank 1, and the fixed plate 34 is arranged at one end of the water tank 1. A lifting assembly 2 and the adjustment plate 33 are arranged to slide horizontally on the first guide rod 31. The screw 35 is arranged parallel to the first guide rod 31 and is threadedly engaged with the fixed plate 34. The two ends of the screw 35 are respectively connected to the adjustment plate 33 and the handwheel 36. When in use, the handwheel 36 drives the screw 35 to rotate, thereby controlling the horizontal movement of the adjustment plate 33 along the first guide rod 31. One end of the screw 35 is rotationally connected to the adjustment plate 33. The second cylinder 32 is arranged on the adjustment plate 33 and connected to the lifting assembly 2, thereby controlling the horizontal movement of the second interface assembly 5.

[0033] In one embodiment, if Figures 1-10As shown, the fixed base assembly 6 includes a fixed bracket 61, a third cylinder 62, and a traction plate 63. The fixed bracket 61 is provided with a first connection hole 611 that cooperates with the first joint 41 and the second joint 51. The first connection hole 611 is a threaded hole or a plain hole. When the first connection hole 611 is a threaded hole, the outer walls of the first joint 41 and the second joint 51 are provided with matching external threads. When the first connection hole 611 is a plain hole, nuts are provided on the first joint 41 and the second joint 51, and the nuts are used to fix the first joint 41 and the second joint 51 to the fixed bracket 61. The third cylinder 62 is provided on the fixed bracket 61, and the piston rod of the third cylinder 62 is connected to the traction plate 63. The traction plate 63 is provided with a second connection hole 631 that cooperates with the first joint 41 and the second joint 51. The third cylinder 62 is used to control the first joint 41 and the second joint 51 through the traction plate 63.

[0034] In one embodiment, if Figures 1-10 As shown, the first joint 41 includes a first body 411, a top ring 412, a spring 413, a first sealing ring 414 and a first pull rod 415. The first body 411 is axially penetrated by a first guide portion 4111 and a first accommodating chamber 4112, and a first fixing portion 4113 is axially protruded in the first accommodating chamber 4112; the top ring 412 is arranged in the first accommodating chamber 4112 through the spring 413, and the top ring 412 is sleeved on the first fixing portion 4113, the first pull rod 415 is slidably arranged on the first guide portion 4111, and a first clamping portion 4151 is radially protruded at one end of the first pull rod 415, the sealing ring 414 is sleeved on the first pull rod 415, and the sealing ring 414 is located between the first fixing portion 4113 and the first clamping portion 4151; the pull rod 415 is axially provided with an air inlet 4152 that passes through. During use, the second interface assembly 5 pushes the heat exchange tube 9 toward the first interface assembly 4, the heat exchange tube 9 is immersed in the first accommodating cavity 4112, and then the end portion contacts the top ring 412. The spring 413 is compressed by the thrust and reacts on the heat exchange tube 9 at the same time to ensure that the other end of the heat exchange tube 9 is always pressed tightly against the second interface assembly 5; thereby coping with the situation where multiple heat exchange tubes 9 have different lengths at the same time.

[0035] In the above embodiment, if Figures 1-10 As shown, a rounded corner is provided at the end of the first accommodating cavity 4112 of the first body 411 to increase the opening size, and the rounded corner is used to guide the heat exchange tube 9 into the first accommodating cavity 4112 .

[0036] In the above embodiment, if Figures 1-10 As shown, the first body 411 is provided with external threads. When the first connecting hole 611 is a threaded hole, it is convenient to connect and fix the first body 411 with the first connecting hole 611.

[0037] In the above embodiment, if Figures 1-10As shown, at least two nuts are provided on the first tie rod 415, which are threadedly engaged with the outer wall of the first tie rod 415. Specifically, the second connecting hole 631 is a blank hole. When connecting the first tie rod 415 and the second connecting hole 631, a nut is first installed on the first tie rod 415, then one end of the first tie rod 415 is passed through the second connecting hole 631, and then another nut is installed. At this time, the two nuts are located on both sides of the traction plate 63. The two nuts secure the first tie rod 415 to the traction plate 63.

[0038] In one embodiment, if Figures 1-10 As shown, the second joint 51 includes a second body 511, a second sealing ring 512 and a second pull rod 513. The second body 511 is axially penetrated by a second guide portion 5111 and a second accommodating chamber 5112, and a second fixing portion 5113 is axially protruded in the second accommodating chamber 5112; the second pull rod 513 is slidably arranged on the second guide portion 5111, and a second clamping portion 5131 is radially protruded at one end of the second pull rod 513. The sealing ring 512 is sleeved on the second pull rod 513, and the sealing ring 512 is located between the second fixing portion 5113 and the second clamping portion 5131. When in use, the second body 511 is fixedly set on the fixed bracket 61, and the second pull rod 513 is connected to the traction plate 63. When the heat exchange tube 9 is inserted into the second accommodating cavity 5112 of the second body 511, the traction plate 63 is driven to move by the third cylinder 62, thereby squeezing the second sealing ring 512 and deforming it into an outer shape, so that the second sealing ring is tightly attached to the inner wall of the heat exchange tube 9, thereby realizing a sealed connection between the second joint 51 and the heat exchange tube 9.

[0039] When the first connection hole 611 has an internal thread, the outer wall of the second body 511 can be provided with a matching external thread, thereby securing the second body 511 to the fixing bracket 61 by rotating the second body 511. Alternatively, when the first connection hole 611 is a plain hole, a nut can be provided on the second body 511, which can be engaged with the second body 511 to clamp the second body 511 to the fixing bracket 61.

[0040] In addition, at least two nuts are provided on the second tie rod 513, which are threadedly engaged with the outer wall of the second tie rod 513. Specifically, the second connection hole 631 is a blank hole. When connecting the second tie rod 513 to the second connection hole 631, one nut is first installed on the second tie rod 513, then one end of the second tie rod 415 is passed through the second connection hole 631, and then another nut is installed. At this point, the two nuts are located on either side of the traction plate 63. The two nuts secure the second tie rod 513 to the traction plate 63.

[0041] In the above embodiment, if Figures 1-10 As shown, the end of the first accommodating cavity 4112 of the second body 511 is provided with a rounded corner to increase the opening size, and the rounded corner is used to guide the heat exchange tube 9 into the first accommodating cavity 4112.

[0042] In the above embodiment, if Figures 1-10 As shown, the second pull rod 513 can be provided with an air inlet in the axial direction for connecting to the gas source. Of course, the second pull rod 513 can also be provided with no air inlet, and gas can be introduced only through the air inlet 4152 of the first pull rod 415.

[0043] In one embodiment, if Figures 1-10 As shown, a positioning plate 64 is provided on the fixing bracket 61. A positioning groove 641 is recessed on the surface of the positioning plate 64. The positioning groove 641 corresponds to the first joint 41 and the second joint 51. The positioning plate 64 is used to position the heat exchange tube 9 and adjust its height to correspond to the first joint 41 and the second joint 51.

[0044] In the above embodiment, if Figures 1-10 As shown, rounded corners are provided between adjacent positioning grooves 641 to prevent sharp corners from causing wear on the surface of the heat exchange tube 9 and to guide the heat exchange tube 9 into the positioning groove 641 through the rounded corners.

[0045] When the utility model is in use, Figures 1-10 As shown, based on the desired length of the heat exchange tube 9, the handwheel 36 drives the screw 35 to adjust the horizontal position of the adjustment plate 33, thereby adjusting the horizontal position of the second interface assembly 5, i.e., the distance between the first interface assembly 4 and the second interface assembly 5. The two ends of the heat exchange tube 9 are then placed on the positioning plates 64 on the first and second interface assemblies 4 and 5, and the heat exchange tube 9 is aligned within the positioning groove 641. The equipment is then started, and the second cylinder 32 controls the second interface assembly 5 to continue moving toward the first interface assembly 4, pushing the heat exchange tube 9 into the first and second joints 4 and 5. The second joint 5 does not have a top ring, and the heat exchange tube 9 is pushed by the spring 413, so that the other end of the heat exchange tube 9 is fully inserted into the second body 51. The top ring 412 and the thrust of the spring 413 compensate for the difference in the length of the heat exchange tube 9 caused by machining errors. The third cylinder 62 then drives the traction plate 63 to pull the first and second pull rods 415 and 513. The first and second sealing rings 414 and 512 are squeezed and deformed to their original shape, pressing against the inner wall of the heat exchange tube 9, thus sealing the first and second joints 4 and 5 with the heat exchange tube 9. Once the connection is complete, the first cylinder 22 controls the lowering of the lifting plate 23 to submerge the heat exchange tube 9 in the water within the water tank 1. Air is introduced through the first and / or second pull rods 415 and 513. If there are cracks or damage in the heat exchange tube 9, bubbles will appear at the corresponding locations, completing the airtightness test.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Without departing from the spirit and scope of the present invention, modifications or equivalent replacements of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An air tightness detection device for heat exchange tubes, characterized in that: The heat exchange device comprises a water tank, a set of lifting components, an adjustment component, a first interface component, and a second interface component. One of the lifting components is fixed at one end of the water tank, and the other lifting component is arranged at the other end of the water tank through the adjustment component. The first interface component and the second interface component are respectively arranged on the lifting components. The two ends of the heat exchange tube are respectively connected to the first interface component and the second interface component. The first interface component and / or the second interface component are connected to the gas source. The first interface assembly includes a fixing seat assembly and at least one first connector; the second interface assembly includes the fixing seat assembly and at least one second connector; the number of the first connectors and the number of the second connectors correspond.

2. The air tightness detection device for heat exchange tubes according to claim 1, characterized in that: The lifting assembly includes a guide bracket, a first cylinder and a lifting plate, the lifting plate is slidably arranged on the guide bracket, the first interface assembly is arranged on the lifting plate, the first cylinder is arranged on the guide bracket, and the first cylinder is connected to the lifting plate.

3. The air tightness detection device for heat exchange tubes according to claim 1, characterized in that: The adjusting assembly includes a first guide rod, a second cylinder, an adjusting plate, a fixed plate, a screw rod and a handwheel. The first guide rod is arranged in parallel on both sides of the water tank, the fixed plate is arranged at one end of the water tank, a lifting assembly and the adjusting plate are horizontally slidably arranged on the first guide rod, the screw rod is arranged parallel to the first guide rod, the screw rod is threadedly engaged with the fixed plate, the two ends of the screw rod are respectively connected to the adjusting plate and the handwheel, the second cylinder is arranged on the adjusting plate, and the second cylinder is connected to the lifting assembly.

4. The air tightness detection device for heat exchange tubes according to claim 1, characterized in that: The fixed seat assembly includes a fixed bracket, a third cylinder and a traction plate. The fixed bracket is provided with a first connecting hole that cooperates with the first joint and the second joint. The third cylinder is provided on the fixed bracket. The piston rod of the third cylinder is connected to the traction plate. The traction plate is provided with a second connecting hole that cooperates with the first joint and the second joint. The first joint and the second joint are controlled by the third cylinder through the traction plate.

5. The air tightness detection device for heat exchange tubes according to claim 1, characterized in that: The first joint includes a first body, a top ring, a spring, a first sealing ring and a first pull rod. The first body is axially penetrated by a first guide portion and a first accommodating chamber, and the first accommodating chamber is axially protruded by a first fixing portion; the top ring is arranged in the first accommodating chamber through the spring, and the top ring is sleeved on the first fixing portion, the first pull rod is slidably arranged on the first guide portion, a first clamping portion is radially protruded at one end of the first pull rod, the sealing ring is sleeved on the first pull rod, and the sealing ring is located between the first fixing portion and the first clamping portion; an axially through-going air inlet is arranged on the pull rod.

6. The air tightness detection device for heat exchange tubes according to claim 5, characterized in that: The first body is provided with an external thread.

7. The air tightness detection device for heat exchange tubes according to claim 5, characterized in that: At least two nuts are provided on the first pull rod, and the nuts are threadably engaged with the outer wall of the first pull rod.

8. The air tightness detection device for heat exchange tubes according to claim 1, characterized in that: The second joint includes a second body, a second sealing ring and a second pull rod. The second body is axially penetrated by a second guide portion and a second accommodating cavity, and a second fixing portion is axially protruded in the second accommodating cavity; the second pull rod is slidably arranged on the second guide portion, and a second clamping portion is radially protruded at one end of the second pull rod. The sealing ring is sleeved on the second pull rod, and the sealing ring is located between the second fixing portion and the second clamping portion.

9. The air tightness detection device for heat exchange tubes according to claim 4, characterized in that: A positioning plate is provided on the fixing bracket, and a positioning groove is concavely provided on the surface of the positioning plate. The positioning groove corresponds to the first joint and the second joint.

10. The air tightness detection device for heat exchange tubes according to claim 9, characterized in that: Rounded corners are provided between adjacent positioning grooves.

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