CN210620895U - Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint - Google Patents
Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint Download PDFInfo
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- CN210620895U CN210620895U CN201921707648.7U CN201921707648U CN210620895U CN 210620895 U CN210620895 U CN 210620895U CN 201921707648 U CN201921707648 U CN 201921707648U CN 210620895 U CN210620895 U CN 210620895U
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Abstract
The utility model discloses a path pipe welded joint postweld thermal treatment does not have cooling induction heater, including the path pipe, be provided with path pipe electric inductor in path tub of outer wall welding seam department, path pipe electric inductor is slice snakelike wainscot structure, divides left side slice path pipe electric inductor and right side slice path pipe electric inductor, and the slice path pipe electric inductor structure of both sides is unanimous, all is fan ring shape structure, and fan ring shape inner ring radius R equals radius R of path pipe plus the pipe wall thickness s of path pipe, promptly: r = R + s, the left sheet-like minor-diameter tube conductive inductor and the right sheet-like minor-diameter tubeFan ring length X of pipe conductive inductor1And the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor are pasted on the outer wall of the small-diameter tube in a semi-surrounding shape. The utility model provides a traditional copper pipe be difficult to the path coupling heat treatment problem of handling, reduced traditional water cooling circulation system to the cost has been practiced thrift.
Description
Technical Field
The utility model relates to a heat treatment technical field, concretely relates to path pipe welded joint post weld thermal treatment does not have cooling induction heater, is applicable to the post weld thermal treatment heating of the interior heating surface pipe of thermal power plant's boiler.
Background
The traditional postweld heat treatment of the welded joint of the heating surface pipe in the boiler of the thermal power plant adopts flame heating or far infrared heating. Flame heating is difficult to ensure uniform temperature due to low efficiency and great influence of operation skills, and is only used for postweld heat treatment of individual repair welding joints of medium and low alloy steel. The flexible resistance heating is suitable for preheating before welding, postheating and postwelding heat treatment, adopts a thermocouple to measure the temperature, and uses automatic temperature control equipment to monitor and record the temperature. However, when the flexible resistance heating is adopted, the requirement on the surface quality of the processed welding joint is high, and a special clamp is required to be manufactured for tightly adhering the heater and the weldment, so that the operation is troublesome and a large space is required. When the far infrared heating is carried out, each welding opening heating device, each thermocouple and each heat preservation device are installed one by one, the efficiency is low, and the temperature field is influenced by a plurality of factors; when the number of the welded junctions is small and the wall thickness of the part is not large, the heat treatment method can meet the requirement of engineering progress and can also ensure the temperature gradient of the joint area of the part. However, with the rapid increase of the number of joints needing postweld heat treatment, the increase of time required for postweld heat treatment and the deterioration of a temperature field caused by the increase of the wall thickness of a material, the traditional heating method and process are far from meeting the requirements of engineering progress and engineering quality. Quality accidents (such as rework, cutting off a welding joint and re-welding) caused by the traditional postweld heat treatment process appear greatly in recent years, wherein the welding joint of the small-diameter tube with the largest number and the most prominent problem is the welding joint of the small-diameter tube with the heating surface.
The medium frequency induction heating utilizes the principle that the conversion among electricity, magnetism and heat energy is utilized to heat the heated object, and can be used for carrying out postweld heat treatment on a welded joint. The current inductors are mainly classified into two types, one type is wound by a copper pipe and cooled by water, the other type is wound by a copper cable, and a heat insulation layer is arranged between the copper cable and a heated workpiece. Medium frequency induction heating has been applied to heat treatment of small-diameter pipe materials, but because the space between the small-diameter pipes of the heating surface is small and only about 5mm exists, the existing inductor cannot be installed, so that the medium frequency induction heating is not applied to post-welding heat treatment of the small-diameter pipe joints of the heating surface.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the cooling-free induction heater for the postweld heat treatment of the small-diameter pipe welding joint is suitable for plane heating, arc surfaces or other heating occasions which can be unfolded into planes, and solves the problem of heat treatment of the small-diameter pipe welding joint which is difficult to treat by a traditional copper pipe by designing the inductor into a flaky snake-shaped veneering structure.
The utility model discloses a technical scheme who solves technical problem and take is:
the utility model provides a no cooling induction heater of path pipe soldered connection postweld thermal treatment, includes the path pipe, path pipe outer wall welding seam department is provided with path pipe electric inductor, path pipe electric inductor is slice snakelike wainscot structure, divides left side slice path pipe electric inductor and right side slice path pipe electric inductor, left side slice path pipe electric inductor and right side slice path pipe electric inductor structure are unanimous, all are fan annular structure, fan annular inner ring radius R equals radius R of path pipe plus the tube wall thickness s of path pipe, promptly: r = R + s, and the fan ring length X of the left and right sheet small-diameter tube conductive inductors1= π R-s; the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor are pasted on the outer wall of the small-diameter tube in a semi-surrounding shape; the number of U-shaped winding turns of the winding belt of the sheet-shaped snake-shaped veneering structure is matched with the diameter of the small-diameter pipe, and the number of U-shaped winding turns is increased by one turn when the diameter of the small-diameter pipe is increased by 20 mm; the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tubeGap spacing L between conductive inductors1Equal to the wall thickness s of the small-diameter pipe and the width n of the winding belt of the sheet-shaped snake-shaped veneering structure1Is 1-1.3 times of the wall thickness of the small-diameter pipe, and the gap distance m between adjacent winding belts1Is 0.6 to 0.8 times of the wall thickness of the small-diameter pipe; the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor respectively comprise an inductor insulating layer, an inductor conductive layer and an inductor insulating layer from inside to outside, and the inductor insulating layers are adhered to the outer wall of the small-diameter tube.
The inductor conducting layer is formed by cutting a copper plate, and Ni-P alloy is chemically plated on the surface of the inductor conducting layer to prevent the inductor conducting layer from being oxidized at high temperature; the inductor insulating layer is positioned between the small-diameter pipe and the inductor conducting layer, and has double effects of insulation and heat preservation; the inductor heat-insulating layer is positioned on the outer side of the inductor conducting layer, and has double effects of insulation and heat preservation.
The manufacturing method of the small-diameter pipe welding joint post-welding heat treatment cooling-free induction heater comprises the following specific steps:
① cutting and molding a copper plate with the thickness of 0.3-0.5 mm according to the shapes of the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor, and bending the copper plate into a sheet snake-shaped veneering structure to obtain a conductive layer of the inductor;
② chemically plating a Ni-P alloy plating layer on the surface of the conducting layer of the inductor to prevent the conducting layer from being oxidized at high temperature, wherein the thickness of the Ni-P alloy plating layer is 1/12-1/15 of the thickness of the conducting layer of the inductor;
③, an inductor insulating layer is arranged between the inductor conducting layer and the small-diameter tube, the inductor insulating layer is formed by bonding glass ribbons layer by layer through a high-temperature bonding agent, the high-temperature bonding agent is formed by mixing aluminum oxide and aluminum dihydrogen phosphate, the molar ratio of the aluminum oxide to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor insulating layer is 1/6-1/8 of the thickness of the large-diameter tube;
④, arranging an inductor heat-insulating layer outside the inductor conducting layer and the Ni-P alloy coating, wherein the inductor heat-insulating layer is formed by bonding glass ribbons layer by layer through a high-temperature binder, the high-temperature binder is formed by mixing alumina and aluminum dihydrogen phosphate, the molar ratio of the alumina to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor heat-insulating layer is 1/5-1/6 of the thickness of the small-diameter pipe wall;
⑤ the thickness of the inductor insulating layer is larger than or equal to the thickness of the inductor insulating layer;
⑥, when manufacturing a left sheet small-diameter tube conductive inductor and a right sheet small-diameter tube conductive inductor, respectively bonding an inductor insulating layer, a large inductor conductive layer and an inductor insulating layer on the dies of the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor in sequence, naturally airing for 0.5-1.0 hour after bonding, and then heating and drying at the drying temperature of 60-80 ℃;
⑦ after the left sheet small-diameter tube electric inductor and the right sheet small-diameter tube electric inductor are manufactured, the left sheet small-diameter tube electric inductor and the right sheet small-diameter tube electric inductor are bent and formed after recrystallization annealing, the radius R of the bending radian of the left sheet small-diameter tube electric inductor and the right sheet small-diameter tube electric inductor is the radius R of the small-diameter tube plus the tube wall thickness s of the small-diameter tube, namely R = R + s, and the fan ring length X of the left sheet small-diameter tube electric inductor and the right sheet small-diameter tube electric inductor is equal to R = R + s1=πR-s ；
⑧, subjecting the bent and formed left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor to stress relief annealing and chemical nickel-phosphorus alloy plating processes to obtain a formed left sheet small-diameter tube conductive inductor and a formed right sheet small-diameter tube conductive inductor;
⑨ when in use, the left sheet small-diameter tube conductive inductor and the right sheet small-diameter tube conductive inductor are pasted on the outer wall of the small-diameter tube in a semi-surrounding shape.
The copper after cold deformation can produce work hardening and residual internal stress, the utility model discloses carry out recrystallization annealing with the copper that is processed, eliminate the work hardening effect on the one hand and be convenient for carry out bending deformation to it on next step, on the other hand eliminates the internal stress and avoids the inductor during operation size to change, improves the dimensional stability of electrically conductive inductor.
The inside great residual internal stress that has of copper after the bending, the utility model discloses thereby carry out destressing annealing internal stress to the copper after the bending, the trend that the electric conductor during operation produced deformation, fracture in the reduction conductive inductor.
The utility model adopts the Cu sheet with a certain thickness to manufacture the inductor, saves space, but can not adopt water cooling, so the method of chemical plating Ni-P is adopted to prevent the inductor from generating oxidation during heating.
The utility model discloses an actively beneficial effect as follows:
1. the space is saved:
the sheet-shaped veneered copper sheet is adopted as the inductor, the purpose of miniaturization of the inductor is achieved, the inductor is designed into a two-piece structure, the two inductors are directly combined through a mechanical method during heating, and troubles encountered during installation of the integral inductor are avoided.
2. Cooling in the absence of water:
the sheet inductor does not need to be cooled by water, so that the cost is saved by reducing the traditional water cooling circulation system.
3. High-temperature oxidation prevention of the chemical plating layer:
when adopting pure copper to do the inductor material, if not cooling, the temperature of inductor is close heating temperature, very easily oxidizes, the utility model discloses chemical plating Ni-P alloy cladding material can effectively prevent the oxidation on the inductor surface.
4. Heat insulation composite layer:
the utility model discloses be the high temperature binder at the inductor surface with aluminium oxide + aluminium dihydrogen phosphate mixture, bond the glass ribbon on the inductor surface, play insulating and heat retaining dual function to improve the bulk strength of inductor, increase of service life.
Drawings
FIG. 1 is a schematic structural diagram of a sheet-shaped serpentine veneering conductive inductor of a small-diameter pipe with a diameter of 45 mm;
FIG. 2 is a schematic structural diagram of a sheet-shaped serpentine veneering conductive inductor of a small-diameter pipe with a diameter of 70 mm;
FIG. 3 is a schematic diagram of the position structure of the small-diameter tube and the sheet-shaped serpentine veneering conductive sensor;
fig. 4 is a top view of fig. 3.
Detailed Description
The invention will be further explained and explained with reference to the following examples and drawings:
example, referring to figures 1, 2, 3 and 4,
the utility model provides a no cooling induction heater of path pipe welded joint postweld thermal treatment, including path pipe 3, be provided with path pipe electric inductor in 3 outer wall welds departments of path pipe, path pipe electric inductor is slice snakelike wainscot structure, divide left side slice path pipe electric inductor 1 and right side slice path pipe electric inductor 2, left side slice path pipe electric inductor 1 and right side slice path pipe electric inductor 2 structure are unanimous, all be fan ring shape structure, fan ring shape inner ring radius R equals radius R of path pipe plus the tube wall thickness s of path pipe, promptly: r = R + s, and the fan-ring length X of the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 21= π R-s; the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 2 are pasted on the outer wall of the small-diameter tube 3 in a semi-surrounding shape; the U-shaped winding turns of the winding belt of the sheet-shaped snake-shaped veneering structure are matched with the diameter of the small-diameter pipe 3, and the U-shaped winding turns are increased by one turn when the diameter of the small-diameter pipe 3 is increased by 20 mm; the gap distance L between the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 21Equal to the wall thickness s of the small-diameter pipe 3 and the width n of the winding belt of the sheet-shaped snake-shaped veneering structure1Is 1-1.3 times of the wall thickness of the small-diameter pipe, and the gap distance m between adjacent winding belts1Is 0.6 to 0.8 times of the wall thickness of the small-diameter pipe; the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 2 respectively comprise an inductor insulating layer 31, an inductor conductive layer 32 and an inductor insulating layer 33 from inside to outside, and the inductor insulating layer 31 is adhered to the outer wall of the small-diameter tube 3.
The inductor conductive layer 32 is formed by cutting a copper plate, and is chemically plated with Ni-P alloy on the surface to prevent the inductor conductive layer 32 from being oxidized at high temperature; the inductor insulating layer 31 is positioned between the small-diameter pipe 3 and the inductor conducting layer 32, and has double effects of insulation and heat preservation; the inductor insulating layer 33 is located outside the inductor conducting layer 32, and has double effects of insulation and heat preservation.
The manufacturing method of the small-diameter pipe welding joint post-welding heat treatment cooling-free induction heater comprises the following specific steps:
① cutting and molding a copper plate with the thickness of 0.3-0.5 mm according to the shapes of the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 2, and bending the copper plate into a sheet snake-shaped veneering structure to obtain an inductor conductive layer 32;
② a layer of Ni-P alloy is chemically plated on the surface of the inductor conducting layer 32 to prevent the inductor conducting layer from being oxidized at high temperature, and the thickness of the Ni-P alloy plating layer is 1/12-1/15 of the thickness of the inductor conducting layer;
③ an inductor insulating layer 31 is arranged between the inductor conducting layer 32 and the small-diameter tube 3, the inductor insulating layer 31 is formed by bonding glass ribbons layer by layer through a high-temperature bonding agent, the high-temperature bonding agent is formed by mixing aluminum oxide and aluminum dihydrogen phosphate, the molar ratio of the aluminum oxide to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor insulating layer 31 is 1/6-1/8 of the thickness of the tube wall of the large-diameter tube;
④ an inductor heat-insulating layer 33 is arranged outside the inductor conducting layer 32 and the Ni-P alloy coating, the inductor heat-insulating layer 33 is formed by bonding glass ribbons layer by layer through a high-temperature adhesive, the high-temperature adhesive is formed by mixing alumina and aluminum dihydrogen phosphate, the mole ratio of the alumina to the aluminum dihydrogen phosphate is 1:2, and the thickness of the inductor heat-insulating layer 33 is 1/5-1/6 of the thickness of the small-diameter pipe wall;
⑤ the thickness of the inductor insulation layer 33 is greater than or equal to the thickness of the inductor insulation layer 31;
⑥, when manufacturing a left sheet small-diameter tube conductive inductor 1 and a right sheet small-diameter tube conductive inductor 2, respectively and sequentially bonding an inductor insulating layer 31, an inductor conductive layer 32 and an inductor insulating layer 33 on the dies of the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 2, naturally airing for 0.5-1.0 hour after bonding, and then heating and drying at the drying temperature of 60-80 ℃;
⑦ made of left sheet-like small diameter tube conductive inductor 1 and right sheet-like small diameter tube conductive inductor 2After the small-diameter tube is manufactured, the small-diameter tube is bent and formed after recrystallization annealing, and the radius R of the bending radian of the left flaky small-diameter tube conductive inductor 1 and the right flaky small-diameter tube conductive inductor 2 is the radius R of the small-diameter tube plus the tube wall thickness s of the small-diameter tube, namely: r = R + s, and the fan-ring length X of the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 21=πR-s ；
⑧, subjecting the bent and formed left sheet small-diameter tube conductive inductor 1 and right sheet small-diameter tube conductive inductor 2 to stress relief annealing and chemical nickel-phosphorus alloy plating processes to obtain a formed left sheet small-diameter tube conductive inductor 1 and a formed right sheet small-diameter tube conductive inductor 2;
⑨ when in use, the left sheet small-diameter tube conductive inductor 1 and the right sheet small-diameter tube conductive inductor 2 are pasted on the outer wall of the small-diameter tube (3) in a semi-surrounding shape.
Example 1
As shown in fig. 1: the inductor conductive layer 32 is manufactured by processing pure copper into a required shape and size according to the heat treatment requirement of a single tube with the diameter of 45mm, then performing recrystallization annealing on the pure copper to reduce the hardness, bending the pure copper into a semicircular arc shape as shown in figure 3, and performing chemical plating. And bonding an inductor insulating layer 31 on the die, then placing an inductor conducting layer 32, bonding an inductor insulating layer 33, and drying to obtain the two flaky snakelike veneered semi-circular arc inductors. The two flaky snakelike veneered semi-circular arc inductors are combined by a mechanical method, and the welding seam can be heated by introducing current.
Example 2
As shown in fig. 2: firstly, processing pure copper into a required shape and size according to the heat treatment requirement of a phi 70mm single tube, then carrying out recrystallization annealing to reduce the hardness, then bending the pure copper into a continuous semicircular arc shape as shown in figure 3, naturally transiting the arcs, and then carrying out chemical plating, thus obtaining the inductor conducting layer 32. And bonding an inductor insulating layer 31 on the die, then placing an inductor conducting layer 32, bonding an inductor insulating layer 33, and drying to obtain the two flaky snakelike veneered semi-circular arc inductors. The two flaky snakelike veneered semi-circular arc inductors are combined by a mechanical method, and the welding seam can be heated by introducing current.
The utility model uses the Cu sheet with a certain thickness as the inductor, thereby greatly saving space and solving the problem of heat treatment of the small-diameter pipe joint which is difficult to be treated by the traditional copper pipe; water cooling is not adopted, so that the traditional water cooling circulation system is reduced, and the cost is saved; the inductor is designed into two parts, so that the installation problem of the inductor under complex conditions is solved; the chemical plating of the Ni-P alloy on the surface of the inductor can effectively prevent the oxidation of the inductor during high-temperature heating; the surface of the inductor is bonded with a glass ribbon by using a mixture of aluminum oxide and aluminum dihydrogen phosphate as a high-temperature binder, so that the dual functions of insulation and heat preservation are achieved, the overall strength of the inductor is improved, and the service life is prolonged.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.
Claims (2)
1. The utility model provides a no cooling induction heater of path pipe soldered connection postweld thermal treatment, includes path pipe (3), its characterized in that: the utility model discloses a small diameter pipe (3) outer wall welding seam department is provided with small diameter pipe conductive inductor, small diameter pipe conductive inductor is slice snakelike wainscot structure, divides left side slice small diameter pipe conductive inductor (1) and right side slice small diameter pipe conductive inductor (2), left side slice small diameter pipe conductive inductor (1) and right side slice small diameter pipe conductive inductor (2) structure are unanimous, all are fan ring shape structure, and fan annular inner ring radius R equals the radius R of small diameter pipe plus the tube wall thickness s of small diameter pipe, promptly: r = R + s, the left side slice path pipe leads the inductanceThe length X of the fan ring of the inductor (1) and the conductive inductor (2) with the sheet small diameter tube on the right side1= π R-s; the left sheet small-diameter tube conductive inductor (1) and the right sheet small-diameter tube conductive inductor (2) are pasted on the outer wall of the small-diameter tube (3) in a semi-surrounding shape; the number of U-shaped winding turns of the winding belt of the sheet-shaped snake-shaped veneering structure is matched with the diameter of the small-diameter pipe (3), and the number of U-shaped winding turns is increased by one turn when the diameter of the small-diameter pipe (3) is increased by 20 mm; the gap distance L between the left sheet small-diameter tube conductive inductor (1) and the right sheet small-diameter tube conductive inductor (2)1Equal to the wall thickness s of the small-diameter pipe (3) and the width n of the winding belt of the sheet-shaped snake-shaped veneering structure1Is 1 to 1.3 times of the wall thickness of the small-diameter pipe (3), and the gap spacing m between adjacent winding belts1Is 0.6 to 0.8 times of the wall thickness of the small-diameter pipe (3); the left sheet small-diameter tube conductive inductor (1) and the right sheet small-diameter tube conductive inductor (2) comprise an inductor insulating layer (31), an inductor conductive layer (32) and an inductor heat-insulating layer (33) from inside to outside, and the inductor insulating layer (31) is adhered to the outer wall of the small-diameter tube (3).
2. The small-diameter tube welding joint post-weld heat treatment cooling-free induction heater according to claim 1, characterized in that: the inductor conducting layer (32) is formed by cutting a copper plate, and Ni-P alloy is chemically plated on the surface of the inductor conducting layer; the inductor insulating layer (31) is located between the small-diameter pipe (3) and the inductor conducting layer (32), and the inductor insulating layer (33) is located on the outer side of the inductor conducting layer (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921707648.7U CN210620895U (en) | 2019-10-12 | 2019-10-12 | Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921707648.7U CN210620895U (en) | 2019-10-12 | 2019-10-12 | Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint |
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| CN210620895U true CN210620895U (en) | 2020-05-26 |
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| CN201921707648.7U Withdrawn - After Issue CN210620895U (en) | 2019-10-12 | 2019-10-12 | Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564946A (en) * | 2019-10-12 | 2019-12-13 | 中国电建集团河南工程有限公司 | Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint and manufacturing method thereof |
-
2019
- 2019-10-12 CN CN201921707648.7U patent/CN210620895U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110564946A (en) * | 2019-10-12 | 2019-12-13 | 中国电建集团河南工程有限公司 | Cooling-free induction heater for postweld heat treatment of small-diameter pipe welding joint and manufacturing method thereof |
| CN110564946B (en) * | 2019-10-12 | 2023-07-21 | 中国电建集团河南工程有限公司 | Non-cooling induction heater for postweld heat treatment of small-diameter pipe welding joint and manufacturing method thereof |
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