CN1697574A - Sheathing heater,its mfg. method and heater - Google Patents
Sheathing heater,its mfg. method and heater Download PDFInfo
- Publication number
- CN1697574A CN1697574A CN 200510070291 CN200510070291A CN1697574A CN 1697574 A CN1697574 A CN 1697574A CN 200510070291 CN200510070291 CN 200510070291 CN 200510070291 A CN200510070291 A CN 200510070291A CN 1697574 A CN1697574 A CN 1697574A
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- heater
- cylindrical shell
- sheathed heater
- metal tube
- bending machining
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- 238000000034 method Methods 0.000 title claims description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims description 29
- 238000003754 machining Methods 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 26
- 238000000137 annealing Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 15
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000011265 semifinished product Substances 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 description 35
- 239000002184 metal Substances 0.000 description 35
- 241000283216 Phocidae Species 0.000 description 22
- 239000000395 magnesium oxide Substances 0.000 description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 11
- 229920001296 polysiloxane Polymers 0.000 description 11
- 238000003860 storage Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000741 silica gel Substances 0.000 description 5
- 229910002027 silica gel Inorganic materials 0.000 description 5
- 210000003168 insulating cell Anatomy 0.000 description 4
- 208000005189 Embolism Diseases 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000004078 waterproofing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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- Resistance Heating (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
PROBLEM TO BE SOLVED: To provide a sheathed heater with excellent corrosion resistance against local corrosion, of low cost and an excellent manufacturing property.
Description
Technical field
The present invention relates to the sheathed heater (heat-generating pipe or electrothermal tube) that uses in the various heaters such as electric heater, especially with sheathed heater and the manufacture method thereof that can effectively implement bending machining and to add the improvement of heater relevant.
Background technology
As everyone knows, among electric heater etc., all adopt sheathed heater is configured in the tank for many years, be stored in the mode of the water in the tank with this sheathed heater heating.
This kind sheathed heater is that eiloid heating wire is configured in the metal tube (heater cylindrical shell), simultaneously, again the magnesium oxide as insulating powder is filled in the metal tube (heater cylindrical shell), by rolling above-mentioned metal tube, form the undergauge processing part, seal with joint filling material simultaneously and form behind the both ends open of handling metal tube.
At this moment this kind of sheathed heater is natural or rectilinear, but also has many bending machining to become required form.
In addition, as the metal tube of this kind sheathed heater, be extensive use of stainless steels such as austenitic stainless steel, ferritic stainless steel such as SUS304, SUS321 for many years.
Especially there is the weakness of local corrosions such as stress corrosion cracking (SCC) and pitting in austenitic stainless steel, and ferritic stainless steel has good corrosion resistance in these areas, thereby even more ideal (with reference to patent documentation 1)
(patent documentation 1) spy opens flat 6-260266 communique (prior art, embodiment, Fig. 1)
Yet, among this kind sheathed heater, when running into when having used the situation of ferritic stainless steel as metal tube, since during the bending machining metal tube once the high temperature with about 1000 ℃ carried out annealing in process, if use the magnesium oxide of the silicones that has mixed anti-blushing agent, silicones can all be decomposed when annealing, and its moisture-proof function is exhausted.Thereby can not use the magnesium oxide that has mixed silicones, had to use the magnesium oxide that mixes anti-blushing agent again as insulating powder.
Under this state, adopt following method: after the metal tube annealing in process,,, and then seal the open-ended of metal tube with the glass-dead seal material with 350～400 ℃ of dryings in order to remove the moisture that has in the hygroscopic magnesium oxide.
At this moment, owing to follow magnesian drying process and glass-dead seal operation, thereby not only make the manufacturing procedure of sheathed heater elongated, and when carrying out glass-dead seal, also need the temperature that glass dust is heated to more than the softening point and dissolve the operation of sealing, in addition, owing to also need the inspection operation that whether seals fully, thereby not only manufacturing cost expands, and because the anti-mechanical shock performance of glass-dead seal material is poor, thereby there is the technical problem that carefully to treat when handling.
Summary of the invention
The present invention puts forward in order to solve above-mentioned technical problem just, and purpose is to provide a kind of corrosion resistance with good anti-local corrosion, cheapness and sheathed heater (sheath heater) and manufacture method and the heater being convenient to make.
In order to solve above-mentioned technical task, annealing temperature during heater cylindrical shell that the inventor etc. are made of ferritic stainless steel with regard to bending machining is inquired into again, found that annealing temperature still can carry out the bending machining of heater cylindrical shell below 850 ℃, and then proposed the present invention program.
That is to say as shown in Figure 1, the invention is characterized in: in heater cylindrical shell 1, dispose in the heating wire 2, two ends at this heating wire 2 connect the terminal member 3 of drawing from the end of this heater cylindrical shell 1, after being filled into insulating powder 4 in the heater cylindrical shell 1, among the sheathed heater that forms by undergauge processing heater cylindrical shell 1, when constituting heater cylindrical shell 1, with not comprising that the simple and easy joint filling material 5 of gas-tight material seals the open-ended of heater cylindrical shell 1 with ferritic stainless steel.
Among such technological means, the workpiece (being made as undergauge processing part 1a) that this case has been processed calandria cylindrical shell 1 with undergauge is a prerequisite, be object mainly, but also comprise the rectilinear form that does not have bending machining part 1b with the form (form) of implementing bending machining with bending machining part 1b.
In addition, the shape of heating wire 2 can be arbitrary shapes such as linear pattern, U font, and terminal member 3 can be any one form of drawing from the two ends of heater cylindrical shell 1 or drawing from an end.
Also have, use stick-likes usually as terminal member 3, as long as but have as the terminal electrode function, any form is all passable.
Besides, in the time of insulating powder 4 lining heating wire 2, also have the function of giving the heat conduction of heater cylindrical shell as Heat Conduction Material, preferably use the high materials of thermal conductivity such as magnesium oxide.In addition, this insulating powder 4 is logical, and can to cross undergauge processing heater simplified 1, improves packed density, thereby can make the thermal conductivity raising between heating wire 2 and heater cylindrical shell.
In addition, heater cylindrical shell 1 adopts ferritic stainless steel to constitute and gets final product, and SuS444, YUS190 etc. are arranged among the ferritic stainless steel.
This ferritic stainless steel has anti-local corrosions such as better anti-stress-corrosion crack and anti-pitting than austenitic stainless steel, thereby even more ideal.
Also have, owing at least one end of heater cylindrical shell 1, leave the opening that is used for filling insulating powder 4, thereby this opening need seal processing in the operation after filling insulating powder 4.
In this case this seals processing, and be just enough with simple and easy joint filling material 5.Simple and easy joint filling material herein only otherwise gassiness seal material (glass-dead seal material etc.) just, also it doesn't matter suitably to select the combination etc. of electro-insulating rubber (silica gel etc.) and insulating cell (insulators of aluminium oxide ceramics etc.).
At this moment, owing to be to seal processing with what simple and easy joint filling material carried out, if insulating powder 4 is to have a hygroscopic material (for example magnesium oxide), preferably can protection against the tide, for example if can make that to contain anti-blushing agent (silica gel etc.) in the insulating powder 4 just passable.At this moment, as the mode that contains anti-blushing agent, the heat energy in the time of can utilizing heat treatment forms coverlay on insulating powder 4 surfaces, also can form coating in advance on insulating powder 4.
Especially the mode of heater cylindrical shell 1 having been implemented bending machining is preferably adopted in this case.
At this moment, as the desirable manufacture method of the sheathed heater of implementing bending machining, can under the annealing temperature condition below 850 ℃, implement at least to implement bending machining after the annealing in process having implemented the bar-shaped sheathed heater semi-finished product of undergauge processing.
As mentioned above, when the bending machining of heater simplified 1, all carry out annealing in process usually, but because this case can deal with problems with very low annealing temperature, thereby as insulating powder 4, can use in magnesium oxide, to have mixed to be used for the product of moistureproof anti-blushing agent (silicones etc.).
Also have, the present invention is not limited to sheathed heater 6, and the heater (comprising the heater with the various forms headed by the electric heater) that above-mentioned sheathed heater has been installed also is an object.
If adopt the sheathed heater that the present invention relates to, owing to used ferritic stainless steel as the heater cylindrical shell, and with the opening of simple and easy joint filling material closed feed water heater cylindrical shell end, thereby except keeping the corrosion resistance of anti-local corrosion well, also needn't comprise glass-dead seal and so on the hermetic sealing material seal processing, thereby manufacture process that can corresponding simplification sheathed heater, and can keep the usability of sheathed heater well.
In addition, if adopt the manufacture method of the sheathed heater that the present invention relates to, owing to can carry out bending machining to the heater cylindrical shell with lower annealing temperature, thereby as the insulating powder of filling in the heater cylindrical shell, can use the insulating powder that contains anti-blushing agent, can produce simply and seal the sheathed heater of handling simply and having implemented bending machining.
Also have, if adopt the heater that the present invention relates to, local corrosion resisting property is good, price is low owing to used, and is convenient to the sheathed heater of production and processing simultaneously, thereby cheap and safe heater can easily be provided.
Description of drawings
Fig. 1 is the key diagram of the sheathed heater summary that the present invention relates to of expression.
Fig. 2 (a) is the key diagram of execution mode 1 that the electric heater of the sheathed heater that the present invention relates to has been installed in expression.
Fig. 2 (b) is the key diagram of the detailed content of the sheathed heater of use in the expression execution mode 1.
Fig. 3 (a) is the key diagram of the manufacturing process of the sheathed heater that relates to of expression execution mode.(b) be the key diagram of the manufacturing process of the sheathed heater that relates to of expression manner of comparison.
Fig. 4 (a)～(d) is the key diagram that model utility is represented the manufacturing process of the sheathed heater that execution mode relates to.
Embodiment
Execution mode with reference to the accompanying drawings describes the present invention in detail.
(execution mode 1)
Fig. 2 (a) illustrates the execution mode of the electric heater that sheathed heater of the present invention has been installed.
Among this figure, electric heater 50 is to support aqua storage tank 51 by aqua storage tank support 52, when these aqua storage tank 51 tops are connecting hot water outlet pipe 51a, connecting water inlet pipe 51b in its underpart, also have, in aqua storage tank 51, disposed in the sheathed heater 20, and sheathed heater 20 has been fixed on heating on the outer wall of aqua storage tank 51 and is stored in water in the aqua storage tank 51.
And label 55 is to cover aqua storage tank 51 insulation material on every side in order to give aqua storage tank 51 insulations.
Shown in Fig. 2 (b), in the present embodiment, sheathed heater 20 is to insert in metal tube 21 in two ends and the eiloid heating wire 22 that terminal rod 23,24 is connected, above-mentioned terminal rod 23,24 is exposed from the two ends of this metal tube 21, after being filled in the above-mentioned metal tube 21 simultaneously,, form undergauge processing part 21a to insulating powder 26 by metal tube 21 being carried out undergauge processing, and then, form bending machining part 21b's by bending machining.
In the present embodiment, metal tube 21 is made of ferritic stainless steel.Especially as desirable ferritic stainless steel, can use SUS444, YUS190 number etc.
At this moment, the wall thickness of metal tube 21 uses the tubing about 0.6～1.0mm usually, but as long as can carry out in the scope of bending machining, suitably selection also should be all right.
In addition, dispose along the axle center of metal tube 21 usually as heating wire 22, but not limited to by this, also can dispose arbitrarily.
Also have,, preferably use the material of good heat conductivity, for example magnesium oxide etc. as insulating powder 26.Used in this example among hygroscopic magnesium oxide is arranged and mixed the silicone material that uses as anti-blushing agent.
In addition, among this enforcement, the both ends open of metal tube 21 uses simple and easy joint filling material 28 to seal.Here said simple and easy joint filling material 28 is meant the hermetic sealing material that does not comprise glass-dead seal material and so at interior joint filling material, for example is used as the silica gel 28a of electro-insulating rubber and is sealed by the insulating cell 28b that the insulator of aluminium oxide ceramics etc. constitutes.
And in Fig. 2 (b), sheathed heater 20 can be by inserting the installing hole 61 of mounting flange dish 60, and welding is fixing then.
Below with reference to Fig. 3 (a) and Fig. 4 (a)～(d), the manufacturing process of the sheathed heater 20 that present embodiment relates to is described.
When making sheathed heater 20, at first shown in Fig. 4 (a), make the accessory 25 that heating wire 22 two ends have connected terminal rod 23,24 in advance, then above-mentioned accessory 25 is inserted in the metal tube 21.
Then, reach shown in Fig. 4 (b), when being filled into insulating powder 26 in the metal tube 21, so that the state that terminal rod 23,24 exposes uses (for example electro-insulating rubber, insulating paper etc.) embolism 27 to be temporarily fixed at the two ends of metal tube 21 as Fig. 3 (a).
Under this state, shown in Fig. 3 (a),, form undergauge processing part 21a (with reference to Fig. 4 (c) by metal tube 21 is implemented rolling (undergauge processing).
After this, the semi-finished product of the sheathed heater 20 of having implemented undergauge processing are implemented bending machining.But when carrying out this bending machining,, need carry out the process annealing shown in Fig. 3 (a) and handle as the operation in early stage.This process annealing is handled is the process annealing temperature (600-850 ℃) that the interior annealing temperature of annealing furnace is set in regulation, is undertaken by the semi-finished product of sheathed heater 20 being placed on send on the conveyer belt that can suitably select transfer rate.
When this process annealing is handled, because the semi-finished product of sheathed heater 20 can be handled with 600～850 ℃ annealing temperature at short notice, thereby the silicones in the insulating powder 26 is dissolved by this heat and form by overlay film at mgo surface, and the moisture that can be prevented the outside by overlay film that this silicones constitutes enters magnesium oxide.
Then, after having carried out bending machining, remove the interim embolism 27 at metal tube 21 two ends, shown in Fig. 4 (d), (silica gel 28a+ insulating cell 28b) seals processing with simple and easy joint filling material 28.
About the welding sequence of mounting flange 60, both can handle the row that advances sealing with simple and easy joint filling material 28, also can handle laggard row above-mentioned sealing.
In addition,, illustrate as metal tube use ferritic stainless steel below with reference to Fig. 3 (b) as its manner of comparison, and in the manufacturing process that implements the sheathed heater of bending machining afterwards through The high temperature anneal (about 1050～1100 ℃).
Sheathed heater in this manner of comparison is connected to the heating wire two ends with the terminal rod, and insert in the metal tube back that makes it to become one.Then in metal tube, fill in the insulating powder two ends of interim plug metal pipe under the state that the terminal rod is exposed.
Under this state,, metal tube forms the undergauge processing part by being implemented rolling (undergauge processing).
Then, before bending machining, metal tube is implemented The high temperature anneal (for example the annealing temperature in the annealing furnace is about 1050～1100 ℃),, form the bending machining part by making the softening bending machining of carrying out afterwards of metal tube.
Then remove the interim embolism at the metal tube two ends after the bending machining, make the insulating powder drying in the metal tube, as moisture preventive measure, carry out airtight seal with the glass-dead seal material, and then seal with secondary joint filling material (silica gel+insulating cell) to above-mentioned insulating powder.
As mentioned above, among manner of comparison, want metal tube is implemented bending machining, must carry out the The high temperature anneal about 1050-1100 ℃ in advance, if use the insulating powder that has mixed silicones, the silicones that this insulating powder contains can be because of the aging water proofing property of losing but at this moment.
So, want effectively to prevent airborne moisture, as the processing of sealing of metal tube end, must carry out the hermetic sealing of glass-dead seal and so on, manufacturing cost is increased.
In contrast, though the metal tube 21 that present embodiment uses same ferritic stainless steel to constitute, but because the annealing in process before the bending machining is handled and can be dealt with problems with process annealing, even thereby use the insulating powder 26 mixed silicones, also can avoid disappearing because of the aging water resistance that causes of silicones.
In addition, owing to can keep water proofing property, thereby, needn't adopt the hermetic sealing of glass-dead seal and so on, thereby can make the corresponding decline of manufacturing cost as the processing of sealing of metal tube 21.
Claims (5)
1, a kind of sheathed heater, it is characterized in that: in the heater cylindrical shell, dispose heating wire, connect the terminal member of drawing at the two ends of this heating wire simultaneously from the cartridge heater end of body, after insulating powder being filled in the heater cylindrical shell, among the sheathed heater that forms by undergauge processing heater cylindrical shell, constitute the heater cylindrical shell with ferritic stainless steel, simultaneously with not comprising that the simple and easy joint filling material of gastight material seals the open-ended of heater cylindrical shell.
2, according to the described sheathed heater of claim 1, it is characterized in that: the heater cylindrical shell has been implemented bending machining.
3, sheathed heater according to claim 1 is characterized in that: contain anti-blushing agent in the insulating powder.
4, a kind of manufacture method that is used to make the described sheathed heater of claim 2, it is characterized in that: for the bar-shaped sheathed heater semi-finished product after the undergauge processing, under the annealing temperature condition below at least 850 ℃, after the annealing in process, implement bending machining.
5, a kind of heater is characterized in that: disposed each described sheathed heater of claim 1 to 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004145170A JP2005327620A (en) | 2004-05-14 | 2004-05-14 | Sheathed heater, its manufacturing method, and heating device |
| JP2004145170 | 2004-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1697574A true CN1697574A (en) | 2005-11-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510070291 Pending CN1697574A (en) | 2004-05-14 | 2005-05-13 | Sheathing heater,its mfg. method and heater |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005327620A (en) |
| CN (1) | CN1697574A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101351059B (en) * | 2008-08-29 | 2011-05-18 | 镇江东方电热有限公司 | Method and fixture for improving insulation heat-conducting property of electric heating tube |
| CN103273631A (en) * | 2013-05-14 | 2013-09-04 | 乐清市海狮电热电器制造有限公司 | Hot runner heater and manufacture method thereof |
| CN103916991A (en) * | 2014-03-12 | 2014-07-09 | 无为虹波电器有限公司 | Sealing process of semi-finished electric heating pipe |
| CN104284460A (en) * | 2013-07-05 | 2015-01-14 | 镇江市清安电器有限公司 | High-temperature drying-free U-shaped pipe and manufacturing method thereof |
| CN105072713A (en) * | 2015-09-08 | 2015-11-18 | 湖州思创电热科技有限公司 | Heating pipe high temperature-resistant sealing structure and operation method |
| CN105307300A (en) * | 2015-11-25 | 2016-02-03 | 王丽霞 | Improved water heater electric heating pipe |
| CN106658800A (en) * | 2016-11-28 | 2017-05-10 | 江西江钨稀有金属新材料股份有限公司 | Induction coil heating device and manufacturing method thereof |
| CN106888517A (en) * | 2016-09-06 | 2017-06-23 | 郭玉琦 | Tube body of electric heating tube, electric heating tube structure and manufacturing method |
| CN107071938A (en) * | 2017-05-19 | 2017-08-18 | 杭州热威机电有限公司 | A kind of technical method for improving electrothermal tube stainless steel pipe performance |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523641A (en) * | 2011-12-19 | 2012-06-27 | 王荣其 | Manufacturing method of heating pipe for oil heater |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS598294A (en) * | 1982-07-06 | 1984-01-17 | 松下電器産業株式会社 | Method of producing sheathed heater |
| JPS6132380A (en) * | 1984-07-20 | 1986-02-15 | 松下電器産業株式会社 | Sea heater |
| JP3533548B2 (en) * | 1996-07-12 | 2004-05-31 | 日新製鋼株式会社 | Ferritic stainless steel pipe for heat resistance with excellent workability |
-
2004
- 2004-05-14 JP JP2004145170A patent/JP2005327620A/en active Pending
-
2005
- 2005-05-13 CN CN 200510070291 patent/CN1697574A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101351059B (en) * | 2008-08-29 | 2011-05-18 | 镇江东方电热有限公司 | Method and fixture for improving insulation heat-conducting property of electric heating tube |
| CN103273631A (en) * | 2013-05-14 | 2013-09-04 | 乐清市海狮电热电器制造有限公司 | Hot runner heater and manufacture method thereof |
| CN104284460A (en) * | 2013-07-05 | 2015-01-14 | 镇江市清安电器有限公司 | High-temperature drying-free U-shaped pipe and manufacturing method thereof |
| CN103916991A (en) * | 2014-03-12 | 2014-07-09 | 无为虹波电器有限公司 | Sealing process of semi-finished electric heating pipe |
| CN105072713A (en) * | 2015-09-08 | 2015-11-18 | 湖州思创电热科技有限公司 | Heating pipe high temperature-resistant sealing structure and operation method |
| CN105307300A (en) * | 2015-11-25 | 2016-02-03 | 王丽霞 | Improved water heater electric heating pipe |
| CN106888517A (en) * | 2016-09-06 | 2017-06-23 | 郭玉琦 | Tube body of electric heating tube, electric heating tube structure and manufacturing method |
| CN106658800A (en) * | 2016-11-28 | 2017-05-10 | 江西江钨稀有金属新材料股份有限公司 | Induction coil heating device and manufacturing method thereof |
| CN107071938A (en) * | 2017-05-19 | 2017-08-18 | 杭州热威机电有限公司 | A kind of technical method for improving electrothermal tube stainless steel pipe performance |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005327620A (en) | 2005-11-24 |
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