CN101340745A - Method for enhancing performance of electric heating tube - Google Patents
Method for enhancing performance of electric heating tube Download PDFInfo
- Publication number
- CN101340745A CN101340745A CNA200810124661XA CN200810124661A CN101340745A CN 101340745 A CN101340745 A CN 101340745A CN A200810124661X A CNA200810124661X A CN A200810124661XA CN 200810124661 A CN200810124661 A CN 200810124661A CN 101340745 A CN101340745 A CN 101340745A
- Authority
- CN
- China
- Prior art keywords
- pipe
- electric heating
- disposal
- processing
- temperature
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000005485 electric heating Methods 0.000 title claims abstract description 33
- 230000002708 enhancing effect Effects 0.000 title 1
- 239000000843 powder Substances 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 14
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims abstract description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 29
- 239000011265 semifinished product Substances 0.000 claims description 20
- 239000000395 magnesium oxide Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 11
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 229920002545 silicone oil Polymers 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005915 ammonolysis reaction Methods 0.000 claims description 6
- 239000003034 coal gas Substances 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000003570 air Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000004320 controlled atmosphere Methods 0.000 claims description 3
- 238000013022 venting Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract 3
- 238000005498 polishing Methods 0.000 abstract 1
- 238000011049 filling Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Abstract
The invention relates to a method used for improving electric heating management performance, belonging to the manufacture technique of an electric heating device. The method of the invention comprises the steps as follows: a: austenitic stainless steel pipe is taken as the external pipe of the electric heating pipe; after electric heating wire and MgO powder are filled in the external pipe by a routine method, the diameter of the external pipe is shortened by the pipe contracting disposal; b: after the pipe contracting disposal, the half finished product is disposed by high temperature once; c: after the high temperature disposal, the pipe-bending process is carried out by a bending deformation method so as to bend the external pipe as bent shape; d: routine moisture-removal disposal or stress-removal disposal or secondary high-temperature disposal is carried out on the half finished product after the pipe-bending process; e: the pipe port is closed after the moisture-disposal disposal or the secondary high-temperature disposal. The method of the invention adds the high temperature polishing disposal or high temperature oxidation disposal or high temperature oxidation disposal process in suitable procedure of the processing technology of the electric heating pipe, thus achieving the objects of improving the high temperature performance, reliability and prolonging the service life of the electric heating pipe by most economical processing steps.
Description
Technical field
The invention belongs to the manufacturing technology of electric heater unit, relate to a kind of method that improves performance of electric heating tube.
Background technology
Common electric heating tube is a shell with metal (the most frequently used is the kind austenitic stainless steel) thin-wall pipes generally, penetrates the high-resistance alloy silk in the pipe as heating wire, fills heat-conducting insulation material (being generally magnesia powder) between electric heating heated filament and inner wall of metal tube.Performances such as the life-span of electric heating tube, insulating properties, dependability mainly are subjected to the influence of the quality level and the processing technology of heating wire, magnesia powder and metal tube.Mainly there is following problem in the manufacture method of conventional electric heating pipe:
1, the magnesia powder of filling in the electric heating tube absorbs airborne moisture easily under nature, thereby reduces its insulation property.Conventional fabrication processes improvement method is to heat to carry out humidity discharging to about 300 ℃ and handle before ferrule, discharge moisture content after, sealing in the short time to the greatest extent, but this method humidity discharging is not thorough.On the one hand, because lower humidity discharging temperature is not enough to form higher vapour pressure, inner steam is difficult to overcome long narrow, closely knit oxide layer resistance fully and all discharges from the mouth of pipe; On the other hand, magnesia powder absorbs the part of moisture content, in the course of processing, can be combined into magnesium hydroxide with magnesia powder, the insulation property of magnesia powder have directly been reduced, and magnesium hydroxide can not be decomposed into magnesium oxide and water fully under lower temperature conditions, and the discharge of moisture content also is very inadequate like this.The reason of this two aspect has directly influenced insulation property, reliability and the life-span of electric heating tube.
2, electric heating tube in order to strengthen its insulation heat-conducting property, need carry out the draw usually and handle after filling magnesia powder,, dwindles caliber with process such as cold pressing, cold rolling that is, makes inner magnesia powder of filling more closely knit; In addition, many heating tubes method of also needing to be bent and deformed is made as shapes such as " U-shaped ", " W shape ".The process of above-mentioned these cold deformations all can cause body to produce internal stress, in use constantly produces micro-crack under the cold cycling effect easily, and continuous extending, finally causes the electric heating tube premature failure.Improvement method in the conventional fabrication processes is to increase by one " destressing treatment process ", for Austenitic stainless steel pipe, promptly is 300 ℃ of-350 ℃ of tempering, also can be the method that slow cooling is handled after 500 ℃-950 ℃.Though this method can reach the purpose of destressing, stainless steel tube is high temperature resistant, the ability of resistance to high temperature corrosion to realizing improving.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method that improves performance of electric heating tube is provided, and it can be improved electric heating tube high-temperature behavior, reliability and useful life in the course of processing of electric heating tube.
Method of the present invention is:
A. with the outer tube of Austenitic stainless steel pipe, the employing conventional method penetrates heating wire and fills magnesia powder in outer tube after, handle the caliber that dwindles outer tube through the draw as electric heating tube;
B. the semi-finished product after the draw being handled carry out the high-temperature process first time, and the described temperature processing first time is that semi-finished product are carried out the processing of high temperature light or high-temperature ammonolysis processing or high temperature oxidation process;
C. the method that is bent and deformed after high-temperature process is carried out bend pipe processing, and outer tube is processed into crooked shape;
D. in bend pipe processing back semi-finished product are carried out conventional humidity discharging and handle or carry out high-temperature process second time, described second time, high-temperature process was semi-finished product to be carried out the high temperature light is handled or high-temperature ammonolysis processing or high temperature oxidation process;
E. the process humidity discharging processing or the high-temperature process rear enclosed mouth of pipe for the second time.
It is at N with semi-finished product that above-mentioned high temperature light is handled
2And H
2Be heated to the processing that 1040-1080 ℃ (± 10 ℃) carry out under the atmosphere of mist.
It is to be protective atmosphere with N2 that above-mentioned high-temperature ammonolysis is handled, and semi-finished product are heated to the processing that 1040-1080 ℃ (± 10 ℃) carry out.
Above-mentioned high temperature oxidation process is that semi-finished product are carried out in the heat treated, feeds coal gas and Air mixing gas or liquefied petroleum gas and Air mixing gas and forms protection controlled atmospher through burning; Venting pressure 〉=the 0.06Mpa of liquefied petroleum gas or coal gas wherein, the volume ratio of liquefied petroleum gas or coal gas and air mixed is (0.4-0.8): 1, the total flow of mist is 17-53M
3/ h, final temperature is 1040-1080 ℃ (± 10 ℃).
The humidity discharging of above-mentioned steps e handle or for the second time after the high-temperature process sealing step of line up comprise and drip silicone oil tube sealing mouth operation just, promptly after coming out of the stove, the semi-finished product of high-temperature process splash into some silicone oil at the mouth of pipe as early as possible, make silicone oil infiltrate the magnesia powder end, enrich the space between powder, prevent the electric heating tube cooling or before final sealing, draw airborne moisture content again.
The present invention has added high temperature light processing or high temperature oxidation process or high temperature oxidation process process in the suitable operation of processing technology of electric heating tube; both can realize changing in the electric heating tube the adsorbed moisture content of magnesium powder at high temperature fully gets rid of; also eliminate the draw fully and handled caused internal stress and surface hardening state; the bend pipe distortion is more prone to; simultaneously can form nitration case or solid oxidation protection rete, thereby reach raising electric heating tube high-temperature behavior, reliability and the purpose in useful life with most economical processing step at stainless steel pipe surface.
Embodiment
Embodiment one: with external diameter
Material is the outer tube of the stainless steel pipe of 304 (Ocr18Ni9) as electric heating tube, carries out the conventional draw after penetrating heating wire and filling magnesia powder and handles; Utilizing protective atmosphere net belt type high temperature furnace that semi-finished product are carried out the high temperature light after the processing handles; Carry out bend pipe processing after the high temperature light is handled, form shapes such as " U-shaped ", " W shape "; Semi-finished product behind the bend pipe are carried out the high temperature light processing second time; After the second time, the high temperature light was handled, outer tube did not splash into silicone oil tube sealing mouth just at the mouth of pipe before the cooling fully.The partial parameters of twice high temperature light processing is as follows:
1) protective atmosphere: feed ammonia, be decomposed into N
2And H
2Mist, atmosphere pressures are 4900Pa, and flow is 25M
3/ h;
2) device temperature: 1060 ± 10 ℃ in two districts, 980 ℃ in a district;
3) by body of heater thermal treatment zone time: 12-18 minute.
Embodiment two, with external diameter
Material is the outer tube of the stainless steel pipe of 310S (Ocr25Ni20) as electric heating tube, carries out the conventional draw after penetrating heating wire and filling magnesia powder and handles; Utilize protective atmosphere net belt type high temperature furnace that semi-finished product are carried out high temperature oxidation process after the processing; Carry out bend pipe processing after the high temperature oxidation process, form shapes such as " U-shaped ", " W shape "; Semi-finished product behind the bend pipe are carried out conventional humidity discharging to be handled; After humidity discharging was handled, outer tube did not splash into silicone oil tube sealing mouth just at the mouth of pipe before the cooling fully.The partial parameters of high temperature oxidation process is as follows:
1) protection controlled atmospher: form by air and liquefied petroleum gas combustion, condensation, dry back, be roughly N
2+ CO
2+ CO+H
2The mist of+trace water, venting pressure 〉=0.06Mpa, ventilation flow rate are 20 (air): 1.2 (liquefied petroleum gas) M
3/ h;
2) device temperature: 1060 ± 10 ℃ in two districts, 980 ℃ in a district;
3) by body of heater thermal treatment zone time: 24-32 minute.
Claims (5)
1, a kind of method that improves performance of electric heating tube is characterized in that:
A. with the outer tube of Austenitic stainless steel pipe, the employing conventional method penetrates heating wire and fills magnesia powder in outer tube after, handle the caliber that dwindles outer tube through the draw as electric heating tube;
B. the semi-finished product after the draw being handled carry out the high-temperature process first time, and the described temperature processing first time is that semi-finished product are carried out the processing of high temperature light or high-temperature ammonolysis processing or high temperature oxidation process;
C. the method that is bent and deformed after high-temperature process is carried out bend pipe processing, and outer tube is processed into crooked shape;
D. in bend pipe processing back semi-finished product are carried out conventional humidity discharging processing or destressing and handle or carry out high-temperature process second time, described second time, high-temperature process was semi-finished product to be carried out the high temperature light is handled or high-temperature ammonolysis processing or high temperature oxidation process;
E. process humidity discharging processing or the destressing processing or the high-temperature process rear enclosed mouth of pipe for the second time.
2, the method for raising performance of electric heating tube according to claim 1 is characterized in that: it is at N with semi-finished product that described high temperature light is handled
2And H
2Be heated to the processing that 1040-1080 ℃ (± 10 ℃) carry out under the atmosphere of mist.
3, the method for raising performance of electric heating tube according to claim 1 is characterized in that: it is to be protective atmosphere with N2 that described high-temperature ammonolysis is handled, and semi-finished product are heated to the processing that 1040-1080 ℃ (± 10 ℃) carry out.
4, the method for raising performance of electric heating tube according to claim 1, it is characterized in that: described high temperature oxidation process, be to carry out in the heat treated, feed coal gas and Air mixing gas or liquefied petroleum gas and Air mixing gas and form protection controlled atmospher through burning, condensation, dry back at semi-finished product; Venting pressure 〉=the 0.06Mpa of liquefied petroleum gas or coal gas wherein, the volume ratio of liquefied petroleum gas or coal gas and air mixed is (0.4-0.8): 1, the total flow of mist is 17-53M
3/ h, finally degree of combustion is 1040-1080 ℃.
5, according to the method for one of claim 1-4 described performance of electric heating tube, it is characterized in that: the humidity discharging processing of step e destressing is handled or for the second time after the high-temperature process sealing step of line up comprise and drip silicone oil tube sealing mouth operation just, promptly after coming out of the stove, the semi-finished product of high-temperature process splash into some silicone oil at the mouth of pipe as early as possible, make silicone oil infiltrate the magnesia powder end, enrich the space between powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810124661XA CN101340745B (en) | 2008-08-29 | 2008-08-29 | Method for enhancing performance of electric heating tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810124661XA CN101340745B (en) | 2008-08-29 | 2008-08-29 | Method for enhancing performance of electric heating tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101340745A true CN101340745A (en) | 2009-01-07 |
| CN101340745B CN101340745B (en) | 2011-11-30 |
Family
ID=40214673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810124661XA Active CN101340745B (en) | 2008-08-29 | 2008-08-29 | Method for enhancing performance of electric heating tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101340745B (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012016399A1 (en) * | 2010-08-06 | 2012-02-09 | Chen Jianliang | Heating rod for water heater |
| CN102769943A (en) * | 2012-07-12 | 2012-11-07 | 安徽安泽电工有限公司 | High-temperature powder steel pipe annealing epoxy sealing process |
| CN103295706A (en) * | 2013-05-09 | 2013-09-11 | 上海鹰峰电子科技有限公司 | Aluminum housing resistor and manufacturing process thereof |
| CN104021898A (en) * | 2014-06-23 | 2014-09-03 | 上海鹰峰电子科技有限公司 | Aluminum-shell resistor and production method thereof |
| CN104853457A (en) * | 2015-05-07 | 2015-08-19 | 华能无锡电热器材有限公司 | Sealing structure of electric heating pipe and processing method |
| WO2015184755A1 (en) * | 2014-06-06 | 2015-12-10 | 镇江东方电热有限公司(中外合资) | Multi-functional protection connector for tube end of electric heating tube and sealing method for tube end of electric heating tube |
| CN106335005A (en) * | 2016-09-14 | 2017-01-18 | 扬中市华荣电器设备有限公司 | Manufacturing method of sand blasting fin electric heating pipe assembly |
| CN106376114A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for pre-heated electric heating pipe assembly |
| CN106376112A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for sand-blasted electric heating pipe assembly |
| CN106376113A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for sand-blasted fin electric heating pipe assembly |
| CN106385719A (en) * | 2016-09-14 | 2017-02-08 | 扬中市华荣电器设备有限公司 | Method for manufacturing vacuum moisture-removing fin electric heating pipe component |
| CN106385720A (en) * | 2016-09-14 | 2017-02-08 | 扬中市华荣电器设备有限公司 | Method for manufacturing fin electric heating pipe assembly |
| CN106413153A (en) * | 2016-09-14 | 2017-02-15 | 扬中市华荣电器设备有限公司 | Preparation method for surface enameled preheating electric heating tube assembly |
| CN106413151A (en) * | 2016-09-14 | 2017-02-15 | 扬中市华荣电器设备有限公司 | Method for manufacturing pre-heating fin electric heating tube assembly |
| CN109413780A (en) * | 2018-10-16 | 2019-03-01 | 安徽苏立科技股份有限公司 | One kind exempting from humidity discharging electric heating tube of water heater processing technology |
| CN113820223A (en) * | 2021-09-18 | 2021-12-21 | 苏州热工研究院有限公司 | Inert atmosphere protection device, test device and method for tensile test of high-temperature performance of thin-walled tube |
| CN114606368A (en) * | 2022-05-11 | 2022-06-10 | 福建青拓特钢技术研究有限公司 | Electric heating cover for simultaneously annealing stainless steel in multiple batches |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2008
- 2008-08-29 CN CN200810124661XA patent/CN101340745B/en active Active
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012016399A1 (en) * | 2010-08-06 | 2012-02-09 | Chen Jianliang | Heating rod for water heater |
| CN102769943A (en) * | 2012-07-12 | 2012-11-07 | 安徽安泽电工有限公司 | High-temperature powder steel pipe annealing epoxy sealing process |
| CN103295706A (en) * | 2013-05-09 | 2013-09-11 | 上海鹰峰电子科技有限公司 | Aluminum housing resistor and manufacturing process thereof |
| WO2015184755A1 (en) * | 2014-06-06 | 2015-12-10 | 镇江东方电热有限公司(中外合资) | Multi-functional protection connector for tube end of electric heating tube and sealing method for tube end of electric heating tube |
| CN104021898A (en) * | 2014-06-23 | 2014-09-03 | 上海鹰峰电子科技有限公司 | Aluminum-shell resistor and production method thereof |
| CN104853457A (en) * | 2015-05-07 | 2015-08-19 | 华能无锡电热器材有限公司 | Sealing structure of electric heating pipe and processing method |
| CN106376112A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for sand-blasted electric heating pipe assembly |
| CN106376114A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for pre-heated electric heating pipe assembly |
| CN106335005A (en) * | 2016-09-14 | 2017-01-18 | 扬中市华荣电器设备有限公司 | Manufacturing method of sand blasting fin electric heating pipe assembly |
| CN106376113A (en) * | 2016-09-14 | 2017-02-01 | 扬中市华荣电器设备有限公司 | Manufacturing method for sand-blasted fin electric heating pipe assembly |
| CN106385719A (en) * | 2016-09-14 | 2017-02-08 | 扬中市华荣电器设备有限公司 | Method for manufacturing vacuum moisture-removing fin electric heating pipe component |
| CN106385720A (en) * | 2016-09-14 | 2017-02-08 | 扬中市华荣电器设备有限公司 | Method for manufacturing fin electric heating pipe assembly |
| CN106413153A (en) * | 2016-09-14 | 2017-02-15 | 扬中市华荣电器设备有限公司 | Preparation method for surface enameled preheating electric heating tube assembly |
| CN106413151A (en) * | 2016-09-14 | 2017-02-15 | 扬中市华荣电器设备有限公司 | Method for manufacturing pre-heating fin electric heating tube assembly |
| CN109413780A (en) * | 2018-10-16 | 2019-03-01 | 安徽苏立科技股份有限公司 | One kind exempting from humidity discharging electric heating tube of water heater processing technology |
| CN109413780B (en) * | 2018-10-16 | 2022-02-25 | 安徽苏立科技股份有限公司 | Processing technology of electric heating tube of tide-free water heater |
| CN113820223A (en) * | 2021-09-18 | 2021-12-21 | 苏州热工研究院有限公司 | Inert atmosphere protection device, test device and method for tensile test of high-temperature performance of thin-walled tube |
| CN113820223B (en) * | 2021-09-18 | 2023-08-22 | 苏州热工研究院有限公司 | Inert atmosphere protection device, test device and method for tensile test of high-temperature performance of thin-wall pipe |
| CN114606368A (en) * | 2022-05-11 | 2022-06-10 | 福建青拓特钢技术研究有限公司 | Electric heating cover for simultaneously annealing stainless steel in multiple batches |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101340745B (en) | 2011-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101340745B (en) | Method for enhancing performance of electric heating tube | |
| CN105274308B (en) | Automobile engine cam vacuum isothermal annealing process | |
| CN107701281A (en) | A kind of automobile exhaust pipe based on heat transfer technology | |
| CN101532720A (en) | Improved structure of energy-saving high-efficiency gas water boiler | |
| EP3106527A1 (en) | Shaftless air heater | |
| CN202272941U (en) | Vacuum heat treatment device for titanium and titanium alloy U-shaped bend pipe | |
| CN102676188A (en) | Special charcoal production equipment and special charcoal production process | |
| CN210229631U (en) | System for treating nitric acid tail gas by selective catalytic reduction denitration method | |
| CN106839067A (en) | A kind of method and its system and heat transferring medium that civil power is efficiently converted to heat energy | |
| CN101748270A (en) | Stainless steel strip bell type annealing furnace | |
| CN207031623U (en) | A kind of polyacrylonitrile-based carbon fibre low-carbon sealing gland high temperature nitrogen blow device | |
| CN103697476B (en) | A kind of flat double-P type radiant tube | |
| MX2011004231A (en) | Heat exchanger for an annealing furnace for exchanging heat between two fluids. | |
| CN208273278U (en) | A kind of refrigerator heater | |
| CN102022950B (en) | Anticorrosive processing method for aluminum-alloy heat-exchanger water pipe for gas water heater | |
| CN105715944A (en) | Bottle interior heating method for LNG gas cylinder vacuum pumping | |
| CN104791836A (en) | Heat exchange device of heating furnace | |
| CN212610825U (en) | Flue gas waste heat recovery assembly for tempering furnace | |
| CN114264166B (en) | Oven heat exchanger | |
| CN103575169B (en) | Manufacturing method for high-specific-gravity and high-hardness cylindrical shot of shotgun | |
| CN204824996U (en) | Hydrogen annealing furnace of band edge portion concurrent heating | |
| CN201317799Y (en) | Hood-type annealing furnace for stainless steel band | |
| CN1369335A (en) | Technology for making seamless steel tube for axle shaft of semitrilar | |
| CN204730641U (en) | A kind of heating furnace | |
| CN209180960U (en) | A kind of new combustion furnace apparatus using yellow phosphoric tail gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230419 Address after: 212000 Dagang mechanical and Electrical Industrial Park, Dagang District, Zhenjiang, Jiangsu Patentee after: ZHENJIANG DONGFANG ELECTRIC HEATING TECHNOLOGY CO.,LTD. Address before: 212000 Dagang mechanical and Electrical Industrial Park, Dagang District, Zhenjiang, Jiangsu Patentee before: ZHENJIANG DONGFANG ELECTRIC HEATING TECHNOLOGY CO.,LTD. |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20090107 Assignee: Jiangsu Oriental Ruiji Energy Equipment Co.,Ltd. Assignor: ZHENJIANG DONGFANG ELECTRIC HEATING TECHNOLOGY CO.,LTD. Contract record no.: X2024320000007 Denomination of invention: Methods to improve the performance of electric heating tubes Granted publication date: 20111130 License type: Common License Record date: 20240228 |