CN201186374Y - Built-in heating device for pipeline welding - Google Patents
Built-in heating device for pipeline welding Download PDFInfo
- Publication number
- CN201186374Y CN201186374Y CNU2008200771856U CN200820077185U CN201186374Y CN 201186374 Y CN201186374 Y CN 201186374Y CN U2008200771856 U CNU2008200771856 U CN U2008200771856U CN 200820077185 U CN200820077185 U CN 200820077185U CN 201186374 Y CN201186374 Y CN 201186374Y
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- China
- Prior art keywords
- heat
- built
- end portion
- heater
- portion supports
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 31
- 238000003466 welding Methods 0.000 title claims abstract description 20
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims description 27
- 239000011148 porous material Substances 0.000 claims description 5
- 230000007774 longterm Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000005485 electric heating Methods 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000007669 thermal treatment Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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Abstract
The utility model relates to a built-in heating equipment used for welding a pipeline, which comprises an electric heating wire which is wrapped on an insulating casing pipe, end supporting plates which are connected with both ends of the insulating casing pipe, a heat insulating layer which is arranged on the external end of the end supporting plate and a metallic chain which is fixedly connected with the end supporting plate, wherein the electric heating wire is connected with the power supply through a power line connection, and protective gas communicating holes are arranged on the heat insulating layer and the end supporting plate. With the equipment, the difficulty during welding a P92 when the temperature difference between inside and outside is too big is solved, namely the equipment solves the reduction of the structure property which is caused by the big temperature difference, the problem is solved, namely catastrophic incidents can not occur during the operation of a power station. The equipment solves the technical difficulty of the too big temperature difference between inside and outside of an existing P92 steel pipe with big thick-wall (more than 70mm), and effectively guarantees the welding quality and satisfies the requirements of the stable and long-term operation of the pipeline.
Description
Technical field
The utility model relates to the built-in heater of a kind of pipeline welding.
Background technology
Along with the electric power unit develops to big capacity high parameter, the power station begins to use with green wood P92 etc., and the thickness of pipeline is increasing, and this brings difficulty to heat treatment, mainly is the inside and outside non-uniform temperature, and internal temperature is low, the external temperature height.On the one hand cause internal-external temperature difference stress, make that post weld heat treatment can not fine removal welding residual stress, and produced new residual stress on the contrary.Because internal temperature is low, the temperature that heat treatment needs does not reach in addition, and to making structure property poor, especially impact flexibility is low.Data shows that heat treatment temperature is lower than 730 ℃ and promptly can not guarantees notched bar impact strength, and heat treatment temperature is 760 ℃, and promptly internal-external temperature difference can not be difficult to reach at present equipment level greater than 30 ℃.Unlikely too high for guaranteeing pipeline internal-external temperature difference stress, impact flexibility meets the demands, and has adopted a series of method on the engineering, as widens heated perimeter and insulation scope, adopts power frequency (intermediate frequency) mode of heating etc.When thickness reaches certain value (more than the 70mm), adopt to widen heated perimeter and be incubated can not guarantee requirement, adopt power frequency (intermediate frequency) mode of heating to be subjected to the restriction of curie point again, temperature can't meet the demands.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of welding quality that guarantees to satisfy the built-in heater of pipeline welding of pipeline operation steady in a long-term needs.
The utility model adopts following technical scheme:
The utility model comprises end portion supports plate that the electrical heating wire on insulating sleeve around the home is connected with the insulating sleeve two ends, is located at the heat-insulation layer of end portion supports plate outer end and the metallic bond of fixedlying connected with the end portion supports plate; described electrical heating wire is connected with power supply by power supply wiring, and heat-insulation layer and end portion supports plate are provided with the protective gas connected entrance.
Insulating sleeve described in the utility model is sleeved on the support bar, fixedlys connected with heat-insulation layer with the end portion supports plate by holding screw in the two ends of support bar.
The utility model power supply wiring is by being connected with electrical heating wire with the power line insulating terminal that the insulation plain cushion constitutes by stud terminal, nut, pad, endoporus insulation external member.
Layer centre or a layer arranged outside at heat-insulation layer described in the utility model has by the fixedly connected resiliency supported sheet of trip bolt.
The utility model heat-insulation layer and end portion supports plate are provided with the thermocouple intercommunicating pore.
The utility model good effect is as follows: the utility model is the mode that adopts inner heating, mainly be by inner heating element heater, the infrared ray that produces directly is radiated on the tube wall, and penetrates tube wall, secondly is by the convection current of inner air tube the pipeline inner tubal wall to be heated.Use the utility model to solve a difficult point in P92 welding process when internal-external temperature difference is excessive, promptly solved the structure property decline that excessive temperature differentials brings, solved this problem, in the power station running in the future, catastrophic accident can not take place.The utility model has solved the excessive technical barrier of internal-external temperature difference of at present big heavy wall (greater than 70mm) P92 steel pipe, can effectively guarantee welding quality, satisfies the needs of pipeline operation steady in a long-term.
Description of drawings
Accompanying drawing 1 is the utility model structural representation
Accompanying drawing 2 is provided with power supply wiring, intercommunicating pore and protective gas connected entrance structural representation for the utility model
Accompanying drawing 3 is the utility model heat insulation layer structure schematic diagram
Accompanying drawing 4 is the utility model user mode schematic diagram
Accompanying drawing 5 is the external endoporus insulation of a utility model power supply wiring external member structural representation
In the accompanying drawings: 1 electrical heating wire, 2 insulating sleeves, 3 support bars, 4 felt pads, 5 end portion supports plates, 6 holding screws, 7 power supply wirings, 8 thermocouple intercommunicating pores, 9 heat-insulation layers, 10 stud terminals, 11 nuts, 12 pads, 13 endoporus insulation external member, 14 insulation plain cushions, 15 protective gas connected entrances, 16 metallic bonds, 17 heating bodys, 18 resiliency supported sheets, 19 trip bolts.
The specific embodiment
Shown in accompanying drawing 1,2, the utility model employing electrical heating wire 1 is enclosed within on the insulating sleeve 2, and end portion supports plate 5 and heat-insulation layer 9 are as the criterion at 2/3 place of following radius can smoothly enter heating body 17 and to guarantee to add the thermal center (-tre) according to the internal diameter adjustment of heating body 17.
The utility model end portion supports plate 5 outer circular heat-insulation layers 9 that install band resiliency supported sheet 18 additional; by trip bolt 19 circular heat-insulation layer 9 and resiliency supported sheet 18 are fixed together; the effect of circular heat-insulation layer 9 is to reduce scattering and disappearing of heat on the one hand, stops scattering and disappearing of internal protection argon gas on the other hand.Circular heat-insulation layer 9 adds resiliency supported sheet 18, so that the utility model takes out (pipeline that particularly has reducing) when withdrawing from smoothly after usefulness.
The effect of the utility model thermocouple intercommunicating pore 8 is temperature of inserting in the thermocouple measurement thermal treatment zone; The effect of protective gas connected entrance 15 is to filling protective gas in the weld zone.The effect that heater is drawn metallic bond 16 is that (flaw detection finish after) is convenient to the utility model heater is taken out after heat treatment is finished.
During the pipeline outer wall heating, thermal source conducts heat to pipeline outer wall by heat conduction and heat radiation, and heat passes to inwall by heat exchange pattern then.The pipeline wall thickness direction is also dispelled the heat outside the thermal treatment zone simultaneously, and inwall also dispels the heat to inner air dielectric by convection type.Inner air then passes to other position by convection type with heat.When heat production and heat radiation reached balance, the inside and outside wall temperature difference no longer changed.It is fast more to dispel the heat, and heat production is more little, and temperature difference is big more.Firing equipment is subjected to the influence of key elements such as power, can not infinitely increase, and reducing heat radiation this moment and disperseing hot source point is exactly good way.
Use the utility model pipe interior adopts the convection current outside the interior gas flow minimizing of constraint heated perimeter and the thermal treatment zone; Inside is established heating element heater and is promptly divided source of heat release by heat radiation and Convective Heating inner-walls of duct.
As shown in Figure 3, earlier the utility model heater is placed the position of counterpart before counterpart, protective gas connected entrance 15, heating element heater power supply wiring 7, temperature survey joint 20, metallic bond 16 place the direction of taking out in the future.The opposite side pipeline is inserted in from the utility model opposite side.Also fixing by welding requirements to good groove.The energising preheating, the temperature of control the utility model heater satisfies preheat requirements, and keeps this temperature in welding process.
The argon filling welding, temperature is controlled at the lower limit of preheat temperature in the welding process, and purpose is to guarantee martensite transfor mation fast.
Post weld heat treatment, control the utility model heter temperature is the upper limit that heat treatment temperature requires.Defect detecting test, cooling back defect detecting test, this moment, the utility model heater was stayed in the pipeline, prepared against when reprocessing and used.After passed examination, be the slowly outwards extraction simultaneously of argon-filled tube, power line 7, thermometric lead with metallic bond 16, protective gas connected entrance 15.
Check the firing equipment integrality, the metal device of staying in the pipeline can not be arranged.Safeguard, take care of the utility model heater, in order to using next time.
After if the utility model heater is drawn out accidentally, can heater be pushed up back again according to duct length with resisting bar stubbornly, various lines connections are together pushed up back when noting pushing up back, can not come off.
The utility model has three electrical heating wires 1, and every electrical heating wire is 10KW, and power supply inserts by three stud terminals 10, and stud terminal 10 is by endoporus insulation external member 13 and 5 insulation of end portion supports plate.
Claims (5)
1, the built-in heater of a kind of pipeline welding; it is characterized in that end portion supports plate (5), heat-insulation layer (9) that is located at end portion supports plate (5) outer end that it comprises that the electrical heating wire (1) on insulating sleeve (2) around the home is connected with insulating sleeve (2) two ends and the metallic bond (16) of fixedlying connected with end portion supports plate (5); described electrical heating wire (1) is connected with power supply by power supply wiring (7), and heat-insulation layer (9) and end portion supports plate (5) are provided with protective gas connected entrance (15).
2, the built-in heater of a kind of pipeline welding according to claim 1, it is characterized in that described insulating sleeve (2) is sleeved on the support bar (3), fixedlys connected with heat-insulation layer (9) with end portion supports plate (5) by holding screw (6) in the two ends of support bar (3).
3, the built-in heater of a kind of pipeline welding according to claim 1 and 2 is characterized in that power supply wiring (7) is by being connected with electrical heating wire (1) by stud terminal (10), nut (11), pad (12), endoporus insulation external member (13) and the power line insulating terminal that insulation plain cushion (14) constitutes.
4, the built-in heater of a kind of pipeline welding according to claim 1 and 2 is characterized in that a described layer centre or a layer arranged outside at heat-insulation layer (9) has by the fixedly connected resiliency supported sheet (18) of trip bolt (19).
5, the built-in heater of a kind of pipeline welding according to claim 1 and 2 is characterized in that heat-insulation layer (9) and end portion supports plate (5) are provided with thermocouple intercommunicating pore (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200771856U CN201186374Y (en) | 2008-05-05 | 2008-05-05 | Built-in heating device for pipeline welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200771856U CN201186374Y (en) | 2008-05-05 | 2008-05-05 | Built-in heating device for pipeline welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201186374Y true CN201186374Y (en) | 2009-01-28 |
Family
ID=40309390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200771856U Expired - Fee Related CN201186374Y (en) | 2008-05-05 | 2008-05-05 | Built-in heating device for pipeline welding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201186374Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012068737A1 (en) * | 2010-11-26 | 2012-05-31 | Lv Runchun | Welding sleeve |
| CN102601552A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力建设工程公司 | Heater for butt-welding steel tubes |
| CN102601490A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力公司电力科学研究院 | Welding process of P92/T92 steel pipe and heating device |
| CN107557541A (en) * | 2017-10-16 | 2018-01-09 | 山东电力建设第工程公司 | The big footpath posted sides pipeline argon filling heating and thermal insulation frock of 9% ~ 12%Cr martensite heat-resistant steels and method |
| CN112372192A (en) * | 2021-01-18 | 2021-02-19 | 泛海海工(山东)智能装备有限公司 | Welding set based on thing networking platform boats and ships assemblage grillage structure |
-
2008
- 2008-05-05 CN CNU2008200771856U patent/CN201186374Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012068737A1 (en) * | 2010-11-26 | 2012-05-31 | Lv Runchun | Welding sleeve |
| CN102601552A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力建设工程公司 | Heater for butt-welding steel tubes |
| CN102601490A (en) * | 2011-12-20 | 2012-07-25 | 宁夏电力公司电力科学研究院 | Welding process of P92/T92 steel pipe and heating device |
| CN102601552B (en) * | 2011-12-20 | 2015-10-07 | 宁夏电力建设工程公司 | The heater of steel pipe butt welding |
| CN107557541A (en) * | 2017-10-16 | 2018-01-09 | 山东电力建设第工程公司 | The big footpath posted sides pipeline argon filling heating and thermal insulation frock of 9% ~ 12%Cr martensite heat-resistant steels and method |
| CN112372192A (en) * | 2021-01-18 | 2021-02-19 | 泛海海工(山东)智能装备有限公司 | Welding set based on thing networking platform boats and ships assemblage grillage structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HEBEI ELECTRIC POWER CORPORATION ELECTRIC POWER RE Free format text: FORMER OWNER: HEBEI ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20130320 Owner name: STATE ELECTRIC NET CROP. HEBEI ELECTRIC POWER CONS Effective date: 20130320 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130320 Address after: 050021 Shijiazhuang Province, Yuhua Province Sports street, South Street, No. 238, No. Patentee after: Electric Power Research Institute of Hebei Electric Power Corporation Patentee after: State Grid Corporation of China Patentee after: Hebei Electric Power Construction & Adjustment Research Institute Address before: 050021 Hebei city of Shijiazhuang Province Sports South Street No. 238 Hebei Electric Power Research Institute Patentee before: Hebei Electric Power Research Institute |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090128 Termination date: 20150505 |
|
| EXPY | Termination of patent right or utility model |