Leakage detection device for calandria heat exchanger

Abstract

The utility model discloses a leakage detection device for a calandria heat exchanger, and relates to the technical field of heat exchanger maintenance. The device comprises a heat exchange tube bundle, two ends of the heat exchange tube bundle are sleeved with tube plates, external expansion fixing mechanisms are inserted into the two ends of the heat exchange tube bundle respectively, the end of one external expansion fixing mechanism is connected with a tube plug through a connecting piece, the other external expansion fixing mechanism is provided with an air guide tube through a connecting piece, and the air guide tube is connected with a vacuum pump. According to the utility model, the external expansion fixing mechanism is arranged to drive the plurality of anti-skid bulges to move back to back, and the external expansion fixing mechanism is fixed at the inner end of the heat exchange tube bundle, so that compared with the traditional technology, a sealing flange matched with the pressure test tube bundle is independently designed according to the outer diameter size of the tube bundle, and the external expansion fixing mechanism can fix the pressure test tube bundle through adjusting the heights of the anti-skid bulges; the leakage detection device can be flexibly positioned with tube bundles with different outer diameters, the adaptability is high, and the use effect of the whole leakage detection device is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchanger repair, in particular to a leak detection device for a tube-type heat exchanger. Background Art

[0002] Tubular heat exchangers are widely used in power, chemical, petrochemical, air conditioning and refrigeration engineering, such as surface air coolers, air heaters, fan coils used in air conditioning engineering, air cooler evaporators and frost-free refrigerator evaporators used in refrigeration engineering. They are not only suitable for the flow of single-phase fluids, but also have great value in phase change heat transfer.

[0003] After long-term use, due to the reduction in heat exchange effect, operators will generally replace the inefficient tube bundles. After assembly, the heat exchange tubes and tube sheets are expanded to complete the seal, and then a pressure test is performed to check for leaks to verify whether the expansion seal is qualified.

[0004] When leak checking for a tubular heat exchanger, a sealing flange must be individually designed and used in conjunction with the pressure test bundle based on the outer diameter of the bundle. The flanges are then bolted and installed at both ends of the bundle. The port connections of this leak detection device have low adaptability and can only accommodate flange connections for pressure test bundles with a single outer diameter, resulting in unsatisfactory results. Utility Model Content

[0005] In response to the above technical problems, the utility model provides a leak detection device for a tube-type heat exchanger, which is used to solve the problem that when leaking in existing tube-type heat exchangers, the leak detection device has low adaptability and can only adapt to the pressure test of tube bundles with a single outer diameter size, resulting in unsatisfactory use effect.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0007] A leak detection device for a tube-type heat exchanger includes a heat exchange tube bundle, with tube sheets sleeved at both ends of the heat exchange tube bundle. Outward expansion fixing mechanisms are respectively inserted into both ends of the heat exchange tube bundle, one end of the outward expansion fixing mechanism is connected to a pipe plug via a connector, and the other outward expansion fixing mechanism is installed with an air guide pipe via a connector, and the air guide pipe is connected to a vacuum pump;

[0008] The outward expansion fixing mechanism includes a sealing sleeve and a driving platform, a connecting piece is installed on one side of the sealing sleeve, and a cartridge is connected to the other side of the sealing sleeve. The cartridge is movably inserted in the end portion of the heat exchange tube bundle, the sealing sleeve and the cartridge are cavity structures, and the inner cavity of the sealing sleeve is connected to the inner cavity of the cartridge. The cross-section of the driving platform is an L-shaped structure, one section of the driving platform is rotatably installed in the cavity of the sealing sleeve, and the other section of the driving platform is rotatably installed in the cavity of the cartridge. The outer circle of the cartridge is movably inserted with a plurality of positioning protrusions distributed in an annular array, and a driving ring is provided in the cartridge, and the inner circle of the driving ring is tightly connected to the outer circle of the driving platform. The outer circle of the driving ring is rotatably connected to the inner circle of the cartridge, and the side of the driving ring is connected to the side of the positioning protrusion inserted into the cartridge by a threaded connection. The outer circle of the sealing sleeve is provided with an arc-shaped through-groove, and a connecting bolt is installed on the outer circle of the driving platform therein. The connecting bolt is slidably installed in the arc-shaped through-groove, and a fixing nut is installed on the connecting bolt.

[0009] Furthermore, a sealing ring is installed on one side of the sealing cylinder connected to the clamping cylinder, a sealing rubber ring is installed on the sealing ring, and the sealing rubber ring is in contact with the outer wall of the tube plate.

[0010] Furthermore, a mounting seat is mounted on one end of the positioning protrusion extending out of the cartridge, and an anti-slip protrusion is detachably mounted on the mounting seat.

[0011] Furthermore, the connecting piece includes an inner spiral tube, one end of which is fixedly connected to the side wall of the sealing tube, and the other end of the inner spiral tube is connected to an outer threaded joint, one of which is connected to the pipe plug, and the other is connected to the air guide tube.

[0012] Furthermore, a sealing gasket is provided on the inner spiral tube, and the sealing gasket is located between the outer thread joint and the sealing cylinder.

[0013] Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention drives multiple anti-slip protrusions to move backward by setting an outward expansion fixing mechanism, and fixes the outward expansion fixing mechanism to the inner end of the heat exchange tube bundle. Compared with the traditional technology, the sealing flange designed according to the outer diameter size of the tube bundle and used in conjunction with the pressure test tube bundle, the outward expansion fixing mechanism can flexibly position the tube bundles with different outer diameters by adjusting the height of the anti-slip protrusions, has high adaptability, and effectively improves the use effect of the entire leak detection device; by setting a mounting seat, the anti-slip protrusion is fixed and clamped in the corresponding mounting seat by bolts, which is convenient for disassembly and replacement of the anti-slip protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structural connection of the utility model after disassembly;

[0016] Figure 3This is a schematic diagram of the structural connection between the outward-expanding fixing mechanism and the connecting piece in the utility model.

[0017] In the picture:

[0018] 1. Tube sheet; 2. Heat exchange tube bundle; 3. Outward expansion fixing mechanism; 4. Connecting parts; 5. Air guide tube; 6. Vacuum pump; 7. Pipe plug; 31. Sealing tube; 32. Clamping tube; 33. Positioning protrusion; 34. Driving ring; 35. Driving platform; 36. Connecting bolt; 361. Arc-shaped groove; 362. Fixing nut; 37. Anti-slip protrusion; 371. Mounting seat; 38. Sealing ring; 381. Sealing rubber ring; 41. Internal screw tube; 42. External threaded joint; 43. Sealing gasket. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0020] A leak detection device for a tube-type heat exchanger includes a heat exchange tube bundle 2, with tube sheets 1 sleeved at both ends of the heat exchange tube bundle 2. Outward expansion fixing mechanisms 3 are respectively inserted into both ends of the heat exchange tube bundle 2, one end of the outward expansion fixing mechanism 3 is connected to a pipe plug 7 through a connector 4, and the other end of the outward expansion fixing mechanism 3 is installed with an air guide pipe 5 through the connector 4, and the air guide pipe 5 is connected to a vacuum pump 6;

[0021] The outward expansion fixing mechanism 3 includes a sealing tube 31 and a driving platform 35. A connector 4 is installed on one side of the sealing tube 31, and a cartridge 32 is connected to the other side of the sealing tube 31. The cartridge 32 is movably inserted into the end of the heat exchange tube bundle 2. The sealing tube 31 and the cartridge 32 are cavity structures. The inner cavity of the sealing tube 31 is connected to the inner cavity of the cartridge 32. The cross section of the driving platform 35 is an L-shaped structure. One section of the driving platform 35 is rotatably installed in the cavity of the sealing tube 31, and the other section of the driving platform 35 is rotatably installed in the cavity of the cartridge 32. The outer circle of the cartridge 32 is movably inserted with multiple annular The positioning protrusions 33 are distributed in an array, and a driving ring 34 is provided in the cartridge 32. The inner circle of the driving ring 34 is tightly connected to the outer circle of the driving platform 35. The outer circle of the driving ring 34 is connected to the inner circle of the cartridge 32 for relative rotation. The side of the driving ring 34 is connected to the side of the positioning protrusion 33 inserted into the cartridge 32 by a threaded connection. The outer circle of the sealing cylinder 31 is provided with an arc-shaped groove 361, and a connecting bolt 36 is installed on the outer circle of the driving platform 35 therein. The connecting bolt 36 is slidably installed in the arc-shaped groove 361, and a fixing nut 362 is installed on the connecting bolt 36. By dragging the connecting bolt 36 to slide in the arc-shaped groove 361, the driving platform 35 in the cavity of the sealing cylinder 31 and the clamping cylinder 32 is driven to rotate, and the driving ring 34 connected to the outer circle of the driving platform 35 is driven to rotate. When the driving ring 34 rotates, the positioning protrusion 33 threadedly connected thereto is driven to extend or retract outward. When the positioning protrusion 33 is engaged with the inner circle of the heat exchange tube bundle 2, the fixing nut 362 is tightened to limit the connecting bolt 36 and ensure a stable engagement.

[0022] A sealing ring 38 is installed on one side of the sealing cylinder 31 connected to the clamping cylinder 32 . A sealing rubber ring 381 is installed on the sealing ring 38 . The sealing rubber ring 381 fits against the outer wall of the tube sheet 1 .

[0023] A mounting seat 371 is mounted on one end of the positioning protrusion 33 extending out of the cartridge 32 , and a non-slip protrusion 37 is detachably mounted on the mounting seat 371 .

[0024] The connecting member 4 includes an inner spiral tube 41, one end of which is fixedly connected to the side wall of the sealing tube 31, and the other end of the inner spiral tube 41 is connected to an outer threaded joint 42, one of which is connected to the pipe plug 7, and the other is connected to the air guide pipe 5.

[0025] A sealing gasket 43 is sleeved on the inner spiral tube 41 , and the sealing gasket 43 is located between the outer threaded joint 42 and the sealing cylinder 31 .

[0026] When using:

[0027] The two outward expansion fixing mechanisms 3 are movably clamped at the two ends of the heat exchange tube bundle 2 through the clamping sleeve 32, and the sealing rubber ring 381 is in close contact with the outer wall of the tube sheet 1. Subsequently, the connecting bolts 36 are manually turned to drive the driving platform 35 to rotate in the cavity of the clamping sleeve 32 and the sealing sleeve 31. The connecting bolts 36 slide in the arc-shaped through grooves 361, driving the driving ring 34 to rotate, and synchronously driving the multiple positioning protrusions 33 to move backward. The backward movement of the multiple positioning protrusions 33 drives the multiple anti-slip protrusions 37 to move backward until the anti-slip protrusions 37 contact the inner wall of the heat exchange tube bundle 2. The outward expansion fixing mechanism 3 is fixed to the end of the heat exchange tube bundle 2 through the friction between the anti-slip protrusions 37 and the inner wall of the heat exchange tube bundle 2. Subsequently, the fixing nut 362 is rotated to make the fixing nut 362 contact the outer wall of the driving platform 35, and the connecting bolts 36 are fixed, thereby fixing the driving platform 35, and sealing the outward expansion fixing mechanism 3 and the end of the heat exchange tube bundle 2;

[0028] Compared with the traditional technology, the sealing flange is designed according to the outer diameter of the tube bundle and matched with the pressure test tube bundle. The outward expansion fixing mechanism 3 can flexibly position the tube bundles with different outer diameters by adjusting the spacing of the anti-slip protrusions 37, which has high adaptability and effectively improves the use effect of the entire leak detection device.

[0029] Subsequently, the air guide tube 5 and the pipe plug 7 are respectively threadedly installed in the corresponding internal threaded tube 41 of the outward expansion fixing mechanism 3 through the corresponding external threaded joints 42, and the sealing gasket 43 contacts the outer side of the sealing tube 31, thereby achieving a sealed connection and fixation between the air guide tube 5, the pipe plug 7 and the corresponding outward expansion fixing mechanism 3;

[0030] Subsequently, the vacuum pump 6 and the external pressure gauge are turned on to monitor the pressure change in the heat exchange tube bundle 2 to determine whether there is any air leakage in the heat exchange tube bundle 2.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A leak detection device for a tube-type heat exchanger, comprising a heat exchange tube bundle (2), wherein tube sheets (1) are provided at both ends of the heat exchange tube bundle (2), and characterized in that: Outward expansion fixing mechanisms (3) are respectively inserted into both ends of the heat exchange tube bundle (2), one end of the outward expansion fixing mechanism (3) is connected to a pipe plug (7) via a connector (4), and the other outward expansion fixing mechanism (3) is installed with an air guide pipe (5) via the connector (4), and the air guide pipe (5) is connected to a vacuum pump (6); The outward expansion fixing mechanism (3) includes a sealing cylinder (31) and a driving platform (35). A connecting piece (4) is installed on one side of the sealing cylinder (31), and a cartridge (32) is connected to the other side of the sealing cylinder (31). The cartridge (32) is movably plugged into the end of the heat exchange tube bundle (2). The sealing cylinder (31) and the cartridge (32) are hollow structures. The inner cavity of the sealing cylinder (31) is connected to the inner cavity of the cartridge (32). The cross section of the driving platform (35) is an L-shaped structure. One section of the driving platform (35) is rotatably installed in the cavity of the sealing cylinder (31), and the other section of the driving platform (35) is rotatably installed in the cavity of the cartridge (32). The outer circle of the cartridge (32) is movably plugged with a plurality of rings. The chuck (32) is provided with a driving ring (34), the inner circle of the driving ring (34) is tightly connected to the outer circle of the driving platform (35), the outer circle of the driving ring (34) is connected to the inner circle of the chuck (32) in a relatively rotatable manner, the side of the driving ring (34) is connected to the side of the positioning protrusion (33) inserted into the chuck (32) by a thread, the outer circle of the sealing cylinder (31) is provided with an arc-shaped through-groove (361), and the outer circle of the driving platform (35) therein is provided with a connecting bolt (36), the connecting bolt (36) is slidably installed in the arc-shaped through-groove (361), and a fixing nut (362) is installed on the connecting bolt (36).

2. The leak detection device for a calandria heat exchanger according to claim 1, characterized in that: A sealing ring (38) is installed on one side of the sealing cylinder (31) connected to the clamping cylinder (32). A sealing rubber ring (381) is installed on the sealing ring (38). The sealing rubber ring (381) is in contact with the outer wall of the tube sheet (1).

3. The leak detection device for a calandria heat exchanger according to claim 2, characterized in that: A mounting seat (371) is mounted on one end of the positioning protrusion (33) extending outside the cartridge (32), and a non-slip protrusion (37) is detachably mounted on the mounting seat (371).

4. The leak detection device for a calandria heat exchanger according to claim 3, characterized in that: The connecting member (4) comprises an inner spiral tube (41), one end of which is fixedly connected to the side wall of the sealing tube (31), and the other end of which is cooperatively connected to an outer threaded joint (42), wherein one outer threaded joint (42) is connected to the pipe plug (7), and the other outer threaded joint (42) is cooperatively connected to the air guide tube (5).

5. The leak detection device for a calandria heat exchanger according to claim 4, characterized in that: A sealing gasket (43) is sleeved on the inner spiral tube (41), and the sealing gasket (43) is located between the outer threaded joint (42) and the sealing cylinder (31).

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