CN217686831U - Device for repairing leakage of heat exchanger - Google Patents
Device for repairing leakage of heat exchanger Download PDFInfo
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- CN217686831U CN217686831U CN202123311264.3U CN202123311264U CN217686831U CN 217686831 U CN217686831 U CN 217686831U CN 202123311264 U CN202123311264 U CN 202123311264U CN 217686831 U CN217686831 U CN 217686831U
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Abstract
The utility model discloses a restore device that heat exchanger leaked, including bloated tight end cap and lining up the coaxial cover from top to bottom establish the bloated end cap on heat exchange tube expansion joint cover expand, the heat exchange tube expansion joint cover the external diameter be less than the heat exchange tube internal diameter, the tight end cap that expands include the circular cone of lower part expand tight section and the locking section on upper portion, the locking section pass the heat exchange tube expand joint cover and lock nut spiro union, the heat exchange tube expand the lower part of joint cover be provided with the heat exchange tube and expand and connect a cover circular cone section, the circular cone expand tight section be located the heat exchange tube expand and connect a cover circular cone section, the heat exchange tube expands and connects cover circular cone section hole tapering to be less than the tight end cap circular cone section hole tapering that expands. The utility model has the advantages of simple structure, convenient operation, good leakage eliminating effect and long sealing service life.
Description
Technical Field
The utility model relates to a heat exchanger technical field, concretely relates to restore device that heat exchanger leaked.
Background
The shell and tube heat exchanger is one of the most widely used heat exchangers in chemical production. It is mainly composed of a shell, a tube plate, a heat exchange tube, a seal head, a baffle plate and the like. The required material can be made of common carbon steel, copper or stainless steel respectively. When heat exchange is carried out, a fluid enters from a connecting pipe of the end socket, flows in the heat exchange pipe and flows out from an outlet pipe at the other end of the end socket, and the fluid is called a pipe pass; the other fluid enters from a connecting pipe of the shell and flows out from the other connecting pipe on the shell, and the shell side is called.
Leakage of the heat exchange tubes is a phenomenon frequently encountered during operation and maintenance of the apparatus. The form of leakage is mainly corrosion leakage, abrasion leakage, and static seal failure leakage. The reasons include problems in the process, inherent defects of equipment, construction habits, quality control and the like. Leakage in tubular heat exchangers is most common due to corrosion at the heat exchanger tube head. The corrosion forms of the tube type heat exchanger are basically three types: electrochemical corrosion, chemical corrosion and stress corrosion.
When the tube type heat exchanger is manufactured, the tube plate and the heat exchange tube are generally welded by manual argon arc welding or automatic argon arc welding, the shape of a welding seam has defects of different degrees, and the stress distribution of the welding seam is not uniform. Copper tubes have been used in large numbers as heat exchange tubes in shell and tube heat exchangers because of their good thermal conductivity. Except that the copper pipe adopts the stick expansion seal, the connection mode of the copper pipe and the pipe plate is mainly strength expansion joint, and the connection of the copper pipe and the pipe plate is the most important and key link in the design and manufacturing process of the heat exchanger. However, when the existing heat exchanger copper tube expands, the heat exchange tube may frequently leak due to the deformation of the tube plate at the joint of the tube ends, the distortion of the tube bundle or the large temperature difference stress between the shell and the tube wall during the use, and the existing commonly used repairing method mainly uses a sealing plug.
For example, CN203811016U discloses a sealing plug, which comprises a conical plug forming interference fit with the orifice of a heat exchange tube, wherein the plug is provided with a through hole which extends axially and penetrates through the upper end face and the lower end face; the top of the plug is provided with an annular flange which protrudes towards the direction of the outer circumferential surface and covers the sealing weld of the heat exchange tube, and the gap between the annular flange and the composite tube plate is sealed by the fillet weld or the gap between the annular flange and the composite tube plate is sealed by a sealing washer arranged below the flange. The defects are poor sealing effect and short service life.
If CN208992092U discloses a welding and expansion joint type plug for repairing leakage of a heat exchanger tube head, the plug sequentially comprises a cylindrical section, a transition section and a welding section, through holes are formed in the axial direction of the cylindrical section, the axis direction of the transition section and the axis direction of the welding section, a plurality of rings of embedded toothed rings are arranged on the peripheral surface of the cylindrical section, the cylindrical section and the transition section are all extended into the heat exchanger tube, the cylindrical section is in an expansion joint mode, the embedded toothed rings of the cylindrical section are inserted into the inner wall of the heat exchanger tube, the welding section is abutted against the outer end face of the heat exchanger tube, one part of the welding section is located in a tube hole of the tube plate, and the welding section and the tube hole of the tube plate are welded together. After the original defective welding line is removed, the cylindrical section is inserted into the inner wall of the heat exchange tube in an expansion joint mode, the welding section is welded with the tube hole of the tube plate, and the sealing effect is good. The defects are that aiming at the full expansion joint structure of the tube plate of the copper tube heat exchanger, the welding process of the plug welding section and the tube hole of the tube plate inevitably influences the surrounding tube plate and tube hole expansion joint structure, and the leakage is caused by the influence of thermal stress and the damage of other expansion joint structures.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a simple structure, convenient operation, the leak hunting is effectual, the long-lived device that restores the heat exchanger and leak of sealing.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a restore device that heat exchanger leaked, link up the coaxial cover from top to bottom including bloated tight end cap and establish the bloated adapter sleeve of heat exchange tube on the tight end cap that expands, the external diameter of the bloated adapter sleeve of heat exchange tube is less than the internal diameter of heat exchange tube, bloated tight end cap include the circular cone of lower part expand tight section and the locking section on upper portion, the locking section pass the bloated adapter sleeve of heat exchange tube and lock nut spiro union, the lower part of the bloated adapter sleeve of heat exchange tube is provided with the bloated adapter sleeve cone section of heat exchange tube, the circular cone expand tight section be located the bloated adapter sleeve cone section of heat exchange tube, the heat exchange tube expands and connects the tapering that the internal hole tapering of cover cone section is less than the circular cone and expands tight section.
As the utility model discloses a preferred embodiment, the locking section includes linkage segment and screw thread section, the linkage segment with the circular cone tight section that expands connect, the screw thread section with lock nut spiro union.
As the preferred embodiment of the utility model, the upper portion of the heat exchange tube expansion sleeve is a heat exchange tube expansion sleeve cylindrical section.
As the utility model discloses a preferred embodiment, the big footpath of the circular cone tight section that expands is less than the big footpath of heat exchange tube expanded joint cover conical section, the path of the circular cone tight section that expands is greater than the path of heat exchange tube expanded joint cover conical section.
The utility model discloses a device of restoreing heat exchanger leakage, through the tight effect of connecting of the heat exchange tube expansion nipple between the tight end cap that expands, effectively solved heat exchanger heat exchange tube and tube sheet seal failure and caused the leakage because of the damage of heat exchange tube itself, the problem that influences the equipment and use.
Compared with the prior art, the utility model has the advantages of it is following:
1. through the cooperation of locking section and lock nut, drive the removal of the tight end cap that expands to through the fitting surface of heat exchange tube expanded joint cover conical section and the tight section of circular cone expanded joint and the little tapering difference of two conical sections make the heat exchange tube expanded joint cover radial expansion, form a reliable and stable sealed, carry out the expanded joint clearance of even extrusion elimination heat exchange tube and tube sheet to circumference simultaneously, it is effectual to disappear to leak, and sealed longe-lived.
2. The leakage at the expansion joint of each heat exchange tube and the tube plate is eliminated without mutual influence, the complete expansion joint structure at the periphery of the leaked heat exchange tube is not damaged, and the leakage elimination effect is stable and reliable.
3. The small leakage can be detected through pressure testing while tightening the locking nut without pressure relief treatment, the treatment process is rapid and convenient, and fire operation is not needed.
4. In the fastening process of the locking nut, the heat exchange tube expansion sleeve is uniformly deformed, the conical section tube wall of the heat exchange tube expansion sleeve is outwards extended and transmitted to the tube wall of the heat exchange tube by vertical extrusion force, the tube wall of the heat exchange tube is also continuously outwards extended and transmitted to the inner hole of the tube plate, and the sealing failure part between the heat exchange tube and the tube plate is re-expanded to achieve the sealing of the expansion plug and the heat exchange tube expansion sleeve, the sealing of the heat exchange tube expansion sleeve and the heat exchange tube, the sealing of the heat exchange tube and the tube plate and triple sealing, so that the expansion connection defect of the heat exchange tube and the tube plate can be overcome, and the leakage caused by the defect of the heat exchange tube can be avoided.
Drawings
FIG. 1 is a schematic structural diagram of a tube-plate heat exchanger;
FIG. 2 is a schematic view of the device of the present invention repairing the failure of the expansion joint between the heat exchange tube and the tube sheet;
FIG. 3 is a schematic structural view of the expansion joint sleeve of the heat exchange tube of the present invention;
fig. 4 is the structural schematic diagram of the expansion plug of the present invention.
In the figure, an expansion plug 1, a conical expansion section 11, a connecting section 12, a thread section 13, a heat exchange tube expansion sleeve 2, a heat exchange tube expansion sleeve conical section 21, a heat exchange tube expansion sleeve cylindrical section 22, a locking nut 6, a heat exchange tube 7, a tube plate 8 and a spot welding fixed point 9.
Detailed Description
The technical solution of the present invention will be further clearly and completely described below with reference to the following embodiments and the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1 to 4, the device for repairing heat exchanger leakage of the present invention comprises an expansion plug 1 and a heat exchange tube expansion sleeve 2 coaxially sleeved on the expansion plug, wherein the outer diameter of the heat exchange tube expansion sleeve 2 is smaller than the inner diameter of the heat exchange tube 7; the expansion plug 1 consists of a conical expansion section 11 at the lower part, a threaded section 13 at the upper part and a connecting section 12 in the middle, the connecting section 12 is connected with the conical expansion section 11, and the threaded section 13 passes through the heat exchange tube expansion sleeve 2 and is in threaded connection with the locking nut 6; the heat exchange tube expansion sleeve 2 consists of a heat exchange tube expansion sleeve conical section 21 at the lower part and a heat exchange tube expansion sleeve cylindrical section 22 at the upper part, and the conical expansion section 11 is positioned at the heat exchange tube expansion sleeve conical section 21; the taper of the inner hole of the conical section 21 of the heat exchange tube expansion sleeve is smaller than that of the conical expansion section 11; the major diameter of the conical expansion section 11 is smaller than that of the heat exchange tube expansion sleeve conical section 21, and the minor diameter of the conical expansion section 11 is larger than that of the heat exchange tube expansion sleeve conical section 21.
When the leakage of the heat exchanger is repaired, the materials of the heat exchange tube expansion sleeve 2 and the expansion plug 1 are selected according to the materials of the heat exchange tube 7 and the tube plate 8 of the heat exchanger, a 16Mn bar material can be selected for a carbon steel heat exchanger, an S30408 seamless steel tube can be selected for a copper tube heat exchanger, and an S22503 forge piece can be selected for a stainless steel heat exchanger. In this embodiment, for a copper tube heat exchanger, the heat exchange tubes 7 are copper tube finned tubes, and are made of TP2, the tube plate 8 is made of Q345R, the specification of the heat exchange tubes 7 is phi 19x1.18, and the thickness of the tube plate 8 is 50mm. The machining sizes of the heat exchange tube expansion sleeve 2 and the expansion plug 1 are determined according to the diameter and the wall thickness of the heat exchange tube 7 and the thickness of the tube plate 8, the material of the heat exchange tube expansion sleeve 2 can be brass, the material of the expansion plug 1 can be S30408, and the machining can be carried out by using a small numerical control lathe or a common small lathe.
When the heat exchanger is repaired to leak, the heat exchange tube expansion sleeve conical section 21 and the heat exchange tube expansion sleeve cylindrical section 22 all extend into the heat exchange tube 7 at the expansion joint with the tube plate 8 of the heat exchanger, the connecting section 12 and the thread section 13 extend into the heat exchange tube expansion sleeve conical section 21, and the thread section 13 partially extends out of the heat exchange tube expansion sleeve cylindrical section 22 to be in threaded connection with the locking nut 6, so that the heat exchange tube expansion sleeve 2 and the expansion plug 1 are mutually matched to achieve the expansion effect. The major diameter of the conical expansion section 11 is smaller than that of the heat exchange tube expansion sleeve conical section 21, the minor diameter of the conical expansion section 11 is larger than that of the heat exchange tube expansion sleeve conical section 21, the conical expansion section 11 is guaranteed to be completely positioned in the heat exchange tube expansion sleeve, and a stable and reliable seal is formed through the matching surface of the heat exchange tube expansion sleeve conical section 21 and the conical expansion section 11 and the small taper difference of the two conical sections. In the fastening process of the locking nut 6, the heat exchange tube expansion sleeve 2 is uniformly deformed, the extrusion force in the vertical direction enables the tube wall of the conical section 21 of the heat exchange tube expansion sleeve to extend outwards and transmit the tube wall to the tube wall of the heat exchange tube 7, the tube wall of the heat exchange tube 7 also continues to extend outwards and transmit the tube wall to the inner hole of the tube plate 8, the sealing failure part between the heat exchange tube 7 and the tube plate 8 is expanded again, the sealing between the expansion plug 1 and the heat exchange tube expansion sleeve 2 is achieved, the sealing between the heat exchange tube expansion sleeve 2 and the heat exchange tube 7 is achieved, the sealing between the heat exchange tube 7 and the tube plate 8 is achieved, and triple sealing is achieved, so that the leakage defect of the heat exchange tube 7 and the tube plate 8 can be overcome, and the defect of the heat exchange tube 7 is suitable for the heat exchange tube 7. And finally, welding the locking nut 6 and the thread section 13 at the spot welding fixed point 9, so that the locking nut 6 is prevented from loosening to cause expansion failure in the use process of the heat exchanger.
The working principle of the utility model is as follows: after leakage at the tube plate 8 of the heat exchanger is found, the end socket is firstly disassembled completely, and the structure of the joint of the heat exchange tube 7 and the tube plate 8 is seen, as shown in fig. 2. Firstly, the thread section 13 extends into the conical section 21 of the expansion joint sleeve of the heat exchange tube to form a whole, then the expansion joint sleeve 2 of the heat exchange tube is slowly plugged into the heat exchange tube 7 until the heat exchange tube is completely in a complete entering state, and because the clearance between the inner diameter of the heat exchange tube 7 and the outer diameter of the expansion joint sleeve 2 of the heat exchange tube is small, the heat exchange tube can be lightly knocked by an auxiliary tool to ensure that the heat exchange tube smoothly enters the heat exchange tube. When the heat exchange tube expansion sleeve 2 completely enters the heat exchange tube 7 or part of the expansion joint sleeve still protrudes outside, the expansion plug 1 is horizontally tensioned along the locking section direction, a locking nut 6 with a proper size is arranged on the external thread of the thread section 13, and the locking nut 6 is slowly fastened to the bottom to ensure that the locking nut 6 is tightly attached to the heat exchange tube 7 or the tube plate 8. And then, in the process of continuously fastening the locking nut 6, the conical expansion section 11 can be pulled out reversely, so that a stable seal is formed between the conical expansion section 11 and the conical section 21 of the heat exchange tube expansion sleeve, after an internal conical matching surface is formed, in the continuous extrusion process, the heat exchange tube expansion sleeve 2 is uniformly deformed, the tube wall of the conical section 21 of the heat exchange tube expansion sleeve is outwards extended and transmitted to the tube wall of the heat exchange tube 7 by the extrusion force in the vertical direction, the tube wall of the heat exchange tube 7 is also continuously outwards extended and transmitted to the inner hole of the tube plate 8, and the sealing failure part between the heat exchange tube 7 and the tube plate 8 is expanded again. The expansion plug 1 and the heat exchange tube expansion sleeve 2 are sealed, the heat exchange tube expansion sleeve 2 and the heat exchange tube 7 are sealed, the heat exchange tube 7 and the tube plate 8 are sealed, and triple sealing is achieved, so that the leakage defect of the heat exchange tube 7 and the tube plate 8 can be overcome, and the heat exchange tube expansion sleeve is suitable for the defect of the heat exchange tube 7. And finally, welding the locking nut 6 and the thread section 13 at the spot welding fixed point 9, so that the locking nut 6 is prevented from loosening to cause expansion failure in the use process of the heat exchanger.
The above is the preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (4)
1. The utility model provides a restore device that heat exchanger leaked, its characterized in that link up the coaxial cover from top to bottom including bloated tight end cap and establish the bloated adapter sleeve of heat exchange tube on the tight end cap that expands, the external diameter of the bloated adapter sleeve of heat exchange tube is less than the internal diameter of heat exchange tube, bloated tight end cap include the circular cone of lower part expand tight section and the locking section on upper portion, the locking section pass the bloated adapter sleeve of heat exchange tube and lock nut spiro union, the lower part of the bloated adapter sleeve of heat exchange tube is provided with the bloated adapter sleeve cone section of heat exchange tube, the circular cone expand tight section be located the bloated adapter sleeve cone section of heat exchange tube, the heat exchange tube expands and connects the taper of cover cone section hole and is less than the taper of the bloated tight section of circular cone.
2. The apparatus for repairing leakage of a heat exchanger according to claim 1, wherein the locking section comprises a connecting section and a threaded section, the connecting section is connected with the conical expansion section, and the threaded section is in threaded connection with the locking nut.
3. The apparatus for repairing a leak in a heat exchanger according to claim 1, wherein the upper portion of the heat exchanger tube expansion sleeve is a cylindrical segment of the heat exchanger tube expansion sleeve.
4. The apparatus for repairing leakage of a heat exchanger according to claim 1, wherein the major diameter of the conical expansion section is smaller than the major diameter of the conical section of the expansion sleeve of the heat exchange tube, and the minor diameter of the conical expansion section is larger than the minor diameter of the conical section of the expansion sleeve of the heat exchange tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123311264.3U CN217686831U (en) | 2021-12-27 | 2021-12-27 | Device for repairing leakage of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123311264.3U CN217686831U (en) | 2021-12-27 | 2021-12-27 | Device for repairing leakage of heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217686831U true CN217686831U (en) | 2022-10-28 |
Family
ID=83728064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123311264.3U Active CN217686831U (en) | 2021-12-27 | 2021-12-27 | Device for repairing leakage of heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217686831U (en) |
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2021
- 2021-12-27 CN CN202123311264.3U patent/CN217686831U/en active Active
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