CN101407903B - Method for improving surface load of electric heating tube - Google Patents
Method for improving surface load of electric heating tube Download PDFInfo
- Publication number
- CN101407903B CN101407903B CN2008102344681A CN200810234468A CN101407903B CN 101407903 B CN101407903 B CN 101407903B CN 2008102344681 A CN2008102344681 A CN 2008102344681A CN 200810234468 A CN200810234468 A CN 200810234468A CN 101407903 B CN101407903 B CN 101407903B
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- CN
- China
- Prior art keywords
- electric heating
- heating tube
- high temperature
- temperature oxidation
- air
- 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.)
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- 238000005485 electric heating Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003915 liquefied petroleum gas Substances 0.000 claims abstract description 9
- 230000003647 oxidation Effects 0.000 claims abstract description 9
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 8
- 239000010935 stainless steel Substances 0.000 claims abstract description 8
- 238000005488 sandblasting Methods 0.000 claims abstract description 7
- 239000003570 air Substances 0.000 claims abstract description 6
- 239000003034 coal gas Substances 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004320 controlled atmosphere Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000004576 sand Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- Heat Treatment Of Articles (AREA)
Abstract
The invention belongs to the manufacturing technology of an electric heating device and relates to a method of improving the surface load of an electric heating tube. The method includes the following steps: after a stainless steel pipe workpiece which is used as a shell of an electric heating tube is processed into a shape needed by an electric heating tube and a sand blasting treatment of an outer surface of the tube shell is carried out, the pipe workpiece is sent into a high temperature furnace for high temperature oxidation treatment; during high temperature oxidation treatment, the treatment temperature in the high temperature furnace is 1060 plus or minus 10 DEG C and the controlled atmospheres in the furnace are air and coal gas, or air and liquefied petroleum gas. On one hand, the invention improves the heat-sinking capability of the electric heating tube through increasing the superficial area of the electric heating tube by about 10 percent through sand blasting; on the other hand, through the high temperature oxidation treatment of the electric heating tube the invention enhances the performance of the material of the stainless steel electric heating tube and improves the surface heat resistance ability of the material of the electric heating tube. According to practical detection, the operating power of the electric heating tube treated after the adoption of the method can be increased by 15 to 20 percent when parameters such as materials, shapes, sizes and the like are not changed.
Description
Technical field
The invention belongs to the manufacturing technology of electric heater unit, relate to a kind of method that improves surface load of electric heating tube.
Background technology
The surface load of electric heating tube is meant the power (W/cm that electric heating tube unit's heating area is born
2), this be electric heating tube under in working order electrical safety performance and the index in work-ing life.The surface load of electric heating tube has all been made concrete regulation in JB/T4088-1999 and two parts of standards of JB/T2379-1993, under the fixed situation of material, diameter, length, the heating medium of electric heating tube, the maximum service rating of electric heating tube has also just determined basically.When the surface load of electric heating tube was higher than standard, electric heating tube the time will occur that nichrome wire blows or rubescent, the overheated phenomenon such as burn in electrothermal tube surface in work.When needs improve the operating power of electric heating tube again, surface load just must increase the size (length, caliber) of electric heating tube or the material of replacing electric heating tube (with nickel content higher stainless steel tube material or employing import stainless steel tube), so that can adapt with it.Will certainly improve the manufacturing cost of electric heating tube and the installing space of increasing electric heater like this, also some rare metallic substance and resources be caused waste.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that can improve surface load of electric heating tube, so that electric heating tube can bear higher operating power under equal dimensions condition.
Method of the present invention is, will be machined to the required shape of electric heating tube as the stainless steel pipe of electric heating tube housing after, the shell outside surface is carried out entering High Temperature Furnaces Heating Apparatus again after the sandblasting carries out high temperature oxidation process.
The employed sand grains of described sandblasting is 80～120 purpose glass microballons or 70～140 purpose silica powders, or the mixing of two kinds of materials.
During described high temperature oxidation process, treatment temp is 1020～1080 ℃ in the High Temperature Furnaces Heating Apparatus, and stove inner control atmosphere is air and coal gas, or air and liquefied petroleum gas (LPG).
Method of the present invention forms a very rough external surface by sandblast on the one hand on the electric heating tube housing, can make the surface-area of electric heating tube increase about 10%, simultaneously because this rough external surface is irregular, the heat that electric heating tube is produced can be torn open from various direction and penetrate, distributes, and therefore the heat-sinking capability of electric heating tube is improved; On the other hand,, can produce the oxide protective layer of one deck black, improve stainless steel electric heating tube material capability, improve the surperficial temperature capacity of electric heating tube material at the outside surface of electric heating tube by high temperature oxidation process to electric heating tube.According to actual detected, adopt the electric heating tube after the inventive method is handled, under the situation of parameter constants such as various materials, shape, size, the operating power of electric heating tube can improve 15-20%.
Embodiment
The implementation process of the inventive method is:
At first, will be machined to the required shape of electric heating tube as the stainless steel pipe of electric heating tube housing; Then the shell outside surface is carried out sandblasting, the employed sand grains of sandblast is 80～120 purpose glass microballons and 70～140 purpose quartz powder mixtures, and the weight proportion of two kinds of sand materials is 1: 1, by high pressure wind-force (8kgf/cm
2About) sandblast is carried out on the surface of electric heating tube, make the very slick originally surface of electric heating tube form rough external surface;
After the sandblasting workpiece sent into and carry out high temperature oxidation process in the protective atmosphere meshbeltfurnace, the parameter of oxide treatment is as follows:
Controlled atmosphere: bubbling air and liquefied petroleum gas (LPG), venting pressure 〉=0.07MPa, ventilation flow rate: 20 (air): 1.2 (liquefied petroleum gas (LPG)) M
3/ h;
Device temperature: 1060 ± 10 ℃ of workspace temperature;
Guipure speed: 130mm/min.
Claims (1)
1. method that improves surface load of electric heating tube is characterized in that: after will being machined to the required shape of electric heating tube as the stainless steel pipe of electric heating tube housing, the shell outside surface being carried out entering High Temperature Furnaces Heating Apparatus again after the sandblasting carry out high temperature oxidation process; When high temperature oxidation process, treatment temp is 1060 ± 10 ℃ in the High Temperature Furnaces Heating Apparatus, and stove inner control atmosphere is air and coal gas, or air and liquefied petroleum gas (LPG).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102344681A CN101407903B (en) | 2008-11-20 | 2008-11-20 | Method for improving surface load of electric heating tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102344681A CN101407903B (en) | 2008-11-20 | 2008-11-20 | Method for improving surface load of electric heating tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101407903A CN101407903A (en) | 2009-04-15 |
| CN101407903B true CN101407903B (en) | 2010-06-02 |
Family
ID=40571109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102344681A Active CN101407903B (en) | 2008-11-20 | 2008-11-20 | Method for improving surface load of electric heating tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101407903B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
-
2008
- 2008-11-20 CN CN2008102344681A patent/CN101407903B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101407903A (en) | 2009-04-15 |
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| 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 | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20090415 Assignee: Zhenjiang Dongfangshanyuan Electric Heating Co.,Ltd. Assignor: ZHENJIANG DONGFANG ELECTRIC HEATING TECHNOLOGY CO.,LTD. Contract record no.: X2023320000253 Denomination of invention: Methods for increasing the surface load of electric heating tubes Granted publication date: 20100602 License type: Common License Record date: 20231214 |