CN201639803U - Electric heating pipe - Google Patents
Electric heating pipe Download PDFInfo
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- CN201639803U CN201639803U CN2010201146120U CN201020114612U CN201639803U CN 201639803 U CN201639803 U CN 201639803U CN 2010201146120 U CN2010201146120 U CN 2010201146120U CN 201020114612 U CN201020114612 U CN 201020114612U CN 201639803 U CN201639803 U CN 201639803U
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- coating
- layer
- platinum
- electrothermal tube
- alloy layer
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- 238000005485 electric heating Methods 0.000 title abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 87
- 238000000576 coating method Methods 0.000 claims abstract description 87
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 85
- 229910052751 metal Inorganic materials 0.000 claims abstract description 77
- 239000002184 metal Substances 0.000 claims abstract description 77
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 42
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000010936 titanium Substances 0.000 claims abstract description 38
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 38
- 239000010935 stainless steel Substances 0.000 claims abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 32
- 238000010438 heat treatment Methods 0.000 claims description 25
- 229910001252 Pd alloy Inorganic materials 0.000 claims description 19
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 19
- 229910052763 palladium Inorganic materials 0.000 claims description 19
- 229910001260 Pt alloy Inorganic materials 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 16
- 230000003746 surface roughness Effects 0.000 claims description 11
- 229940100890 silver compound Drugs 0.000 claims description 10
- 150000003379 silver compounds Chemical class 0.000 claims description 10
- 150000002816 nickel compounds Chemical class 0.000 claims description 9
- 239000012774 insulation material Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 abstract description 22
- 230000007797 corrosion Effects 0.000 abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract 1
- 238000004220 aggregation Methods 0.000 abstract 1
- 239000003513 alkali Substances 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 8
- 239000013049 sediment Substances 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000000280 densification Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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Abstract
The utility model relates to an electric heating pipe, in particular to an electric heating pipe of a domestic electric water heater. Most of the electric heating pipe for the traditional domestic electric water heater has poor corrosion resistant function, unsmooth surface, easy scale aggregation and influence on the service life of the electric heating pipe due to the a stainless steel electric heating pipe. The electric heating pipe of the utility model comprises an electric heating element, a heat conducting and insulating material, a metal sleeve and a surface coating, wherein the surface coating is a platinum family element or metal titanium and protects the metal sleeve against corrosion in an inner container by utilizing the characteristics of stable physical-chemical characteristics, indissolubility in strong acid and alkali and no oxidization in the air of the platinum family element or the metal titanium. The electric heating pipe avoids power leakage accidents caused by pitting corrosion of the metal sleeve. In addition, the corrosion resistant metal, such as the platinum family element or the metal titanium has favorable heat conducting performance and less coating dosage and can effectively control the cost on the premise of obviously improving the corrosion resistance of the electric heating pipe.
Description
Technical field
The utility model relates to a kind of electrothermal tube, the electrothermal tube that uses in particularly a kind of storage-type electric water heater.
Background technology
The electric heating tube metal sleeve that the domestic, electric water heater that existing market is sold is used generally is a stainless steel material, under the particular surroundings of storage-type electric water heater, stainless steel material can not form effectively blunt, particularly in the stainless steel metal during nickel chromium triangle uneven components, because Chinese water quality complexity, after long-term the use, the typical pierceability corrosion phenomenon of stainless steel takes place in the stainless steel tube wall of corrosive water matter area electric heating tube easily, causes water heater electric leakage accident.Electrothermal tube surface meeting after regular heating simultaneously produces incrustation scale, and incrustation scale can influence the heat conduction of electrothermal tube, the efficiency of heating surface of reduction electrothermal tube with constantly accumulative total thickening service time.Simultaneously the electrothermal tube surface scale causes the metal sleeve temperature overheating and the temperature inequality of electrothermal tube, causes the metal sleeve internal stress of electrothermal tube to change, and the electrothermal tube modification occurs, serious causes the metal sleeve explosion, forms the electrothermal tube failure of insulation, causes the electric leakage accident.
Above-mentioned reason has a strong impact on the useful life of electrothermal tube, increases the maintenance cost of water heater, also exists electrothermal tube to lose efficacy and causes the potential safety hazard of electric leakage.
The utility model content
The problem that the utility model exists at above-mentioned electrothermal tube, a kind of electrothermal tube is provided, directly plate very strong inert metal platinum or the nickel of one deck anti-corrosion effects on the metal sleeve surface, significantly strengthen the corrosion resistance of the metal sleeve of electrothermal tube, improve the grade of coating surface roughness simultaneously, reduce the fouling of electrothermal tube with very smooth surface, improve the efficiency of heating surface of electrothermal tube, increase the useful life of electrothermal tube, reduce the water heater maintenance cost, guarantee the fail safe that electric heater uses.
The utility model also provides another electrothermal tube, at first nickel plating coating or nickel compound coating or silvering or silver compound coating in the metal surface, platinum plating metal level more afterwards.
The technical scheme that a kind of electrothermal tube that the utility model provides adopts is: a kind of electrothermal tube, comprise electrical heating elements, and metal sleeve, the heat-conducting insulation material between described electrical heating elements and metal sleeve of described electrical heating elements socket, the metal sleeve surface directly is coated with one deck platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer.
A kind of electrothermal tube that the utility model provides also adopts following attached technical scheme: the surface roughness of described platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is less than 0.8 μ m;
The thickness of described platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is greater than 0.2 μ m;
Described metal sleeve adopts stainless steel material to make;
In the described platinum layer, the content of platinum is higher than 75%;
In the described titanium coating, the content of titanium is higher than 95%.
The technical scheme that another electrothermal tube that the utility model provides adopts is: a kind of electrothermal tube, comprise electrical heating elements, metal sleeve with described electrical heating elements socket, heat-conducting insulation material between described electrical heating elements and metal sleeve, be coated with one deck nickel coating on the surface of described metal sleeve, or nickel compound coating, or silvering, or silver compound coating, at described nickel coating, or nickel compound coating, or silvering, or silver compound coating is coated with one deck platinum layer outward again, or platinum alloy layer, or palladium metal layer, or palladium alloy layer, or titanium coating, or titanium alloy layer.
Another electrothermal tube that the utility model provides also adopts following attached technical scheme: the thickness of described nickel coating or nickel compound coating or silvering or silver compound coating is not less than 2 μ m, and the thickness of described platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is not less than 0.3 μ m;
Described titanium coating thickness is not less than 0.2 μ m.
The beneficial effect that a kind of electrothermal tube that adopts the utility model to provide brings is: (1) the utility model directly plates the very strong platinum layer of one deck anti-corrosion effects on the metal sleeve surface, or platinum alloy layer, or palladium metal layer, or palladium alloy layer, or titanium coating, or titanium alloy layer, significantly strengthen the corrosion resistance of the metal sleeve of electrothermal tube, improve the grade (roughness is less than 0.8 μ m) of coating surface roughness simultaneously, reduce the fouling of electrothermal tube with very smooth surface, improve the efficiency of heating surface of electrothermal tube, increase the useful life of electrothermal tube, reduce the water heater maintenance cost, guarantee the fail safe that electric heater uses.(2) at the direct coating in metal sleeve surface, saved intermediate layer, simple in structure.Adopt the direct coating of nano spray plating technology: handle (oily oil removing is arranged, the rust rust cleaning is arranged) → oven dry → spraying plating coating → oven dry → finished product early stage, different with technologies such as existing immersion plating, brush platings, coating is more closely knit, tight, firm attached to the metal sleeve surface, and surface roughness is lower, more smooth.(3) in the platinum layer, the content of platinum is not less than 75%, is fully guaranteed on decay resistance.Equally, in the described titanium coating, the content of titanium is not less than 95%, is fully guaranteed on decay resistance.
The beneficial effect that another electrothermal tube that adopts the utility model to provide brings is: outermost coating adopts platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer, compare the alloy layer of gold plate or gold, be significantly increased aspect corrosion resistance, refractory, the rub resistance, the surface is more smooth, and is less scaling.Ductility is better, and the intensity of electrothermal tube and toughness all obviously improve.More suitable in the inner bag environment of electric heater.
Description of drawings
The cutaway view of the electrothermal tube that Fig. 1 provides for the utility model first embodiment;
The cutaway view of another electrothermal tube that Fig. 2 provides for the utility model second embodiment.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed description:
As shown in Figure 1, first embodiment that provides for the utility model.This embodiment provides a kind of electrothermal tube, comprise electrical heating elements 1, and metal sleeve 2, the heat-conducting insulation material 3 between described electrical heating elements 1 and metal sleeve 2 of described electrical heating elements 1 socket, metal sleeve 2 surfaces directly are coated with one deck platinum layer 4.
In the present embodiment, except direct platinum plating metal level 4, but also platinum plating alloy-layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer.The surface roughness of described platinum layer 4 or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is less than 0.8 μ m.Make the surface more smooth, smooth surface is difficult for long-pending scaling.
The thickness of described platinum layer 4 or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is greater than 0.2 μ m.Described metal sleeve 2 adopts stainless steel material to make.In the platinum layer 4, the content of platinum is higher than 75%.On decay resistance, be fully guaranteed.As the titanizing metal level, then in the titanium coating, the content of titanium is higher than 95%.On decay resistance, be fully guaranteed.
In the present embodiment, plating one deck platinum layer, platinum group metal color and luster beauty; Ductility is strong; Refractory, rub resistance, corrosion-resistant; Chemical stabilization at high temperature.Particularly the color of platinum is that the nature sky becomes with gloss, and is for a long time constant.Hardness is 4～4.5 degree.Relative density is 21.45, and proportion is 15～19 or 21.4.Ductility is strong; Intensity and toughness, also all much higher than other noble metal.Fusing point is up to 1773.5 ℃.The heat-conductivity conducting performance is good.Chemical property is extremely stable, is insoluble to strong acid and strong base, not oxidation in air.Adapt to very much and do the coating for protection against corrosion on electrothermal tube surface.
As the titanizing metal level,, ductility is arranged because Titanium has metallic luster.Density 4.5 grams per cubic centimters.1660 ± 10 ℃ of fusing points.3287 ℃ of boiling points.Good corrosion resistance is arranged, be not subjected to the influence of atmosphere and seawater.At normal temperatures, can not corroded by watery hydrochloric acid, dilute sulfuric acid, nitric acid or dilute alkaline soln; Titanium is corrosion-resistant, or even stainless steel also is afraid of the corrosive agent that is strong---hot nitric acid.Because the anti-corrosion property that Titanium possesses as the coating on electrothermal tube metal sleeve surface, can strengthen the Corrosion Protection of electrothermal tube.
Electrothermal tube surface composition of scale mainly is the sediment of CaCO2 and Mg (OH) 2, is that chemical reaction generation CaCO2 and Mg (OH) 2 take place Ca and the Mg in the water, and some is that sacrificial anode generation chemical reaction when work generates water insoluble Mg (OH) 2.Because the heating tube temperature is very high, water-fast CaCO2 and Mg (OH) 2 at first accumulates in the electrothermal tube surface.The electrothermal tube surface ratio is more coarse at present, helps sediment and electrothermal tube surface strong bonded, because the electrothermal tube temperature is very high, with electrothermal tube surface precipitation thing sintering, forms fine and close incrustation scale.Be difficult to come off automatically.
Through research, the electrothermal tube surface is smooth more, and sediment is not easy electrothermal tube surface strong bonded more, be difficult to form blocked up sediment, during electrothermal tube work, the huge temperature difference can be that sediment comes off from the electrothermal tube surface, avoids sediment to sinter fine and close incrustation scale into.
At the direct coating in metal sleeve surface, saved intermediate layer, simple in structure.Adopt the direct coating of nano spray plating technology: handle (oily oil removing is arranged, the rust rust cleaning is arranged) → oven dry → spraying plating coating → oven dry → finished product early stage, different with technologies such as existing immersion plating, brush platings, coating is more closely knit, tight, firm attached to the metal sleeve surface, and surface roughness is lower, more smooth.
Describe titanizing metal layer process below in detail: titanizing metal level electrothermal tube is formed electrothermal tube by electrical heating elements 1 and metal sleeve 2 and the heat-conducting insulation material 3 that is filled between the two, at first plate Titanium 6 on the metal sleeve surface, guarantee that the coating densification is firm greater than 0.2 μ m.Purity is not less than 95%, guarantees the corrosion resistance of coating.The coating surface roughness should be controlled at more than the 0.8 μ m, guarantees the smooth of surface, prevents fouling.For guaranteeing surface roughness, can suitably increase the thickness of Titanium coating, on technology the scheme of implementing easily.
As shown in Figure 2, second embodiment that provides for the utility model, another electrothermal tube that this embodiment provides, comprise electrical heating elements 1, and metal sleeve 2, the heat-conducting insulation material 3 between described electrical heating elements 1 and metal sleeve 2 of described electrical heating elements 1 socket, be coated with one deck nickel coating 5 on the surface of described metal sleeve 2, outside nickel coating 5, be coated with one deck platinum layer 4.
Except that nickel plating coating 5, but also nickel plating compound coating or silvering or the replacement of silver compound coating, and the platinum layer 4 of plating also can be by platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer replacement outside nickel coating 5.
The thickness of described nickel coating 5 or nickel compound coating or silvering or silver compound coating is not less than 2 μ m, and the thickness of described platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is not less than 0.3 μ m.Described titanium coating thickness is not less than 0.2 μ m.This embodiment compares with first embodiment, and something in common is all to adopt platinum layer 4 or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer.Refractory, rub resistance, corrosion resistance all are significantly increased.Adopt nano spray plating technology, it is more tight that nickel coating 5 and platinum layer 4 and metal sleeve 2 are adhered to,, guarantee that the coating densification is firm, difficult drop-off.
Concrete technology is as follows: form electrothermal tube by electrical heating elements 1 and metal sleeve 2 and the heat-conducting insulation material 3 that is filled between the two, at first plate nickel coating 5 or the nickel compound coating that is no less than 2 μ m on metal sleeve 2 surfaces, also can be the silvering of same thickness or silver compound coating to basic unit's plating, guarantee that the coating densification is firm.And then plate platinum layer 4 or the platinum family element that is no less than 0.3 μ m, purity is not less than 75%, guarantees the corrosion resistance of coating.The coating surface roughness should be controlled at more than the 0.8 μ m, guarantees the smooth of surface, prevents fouling.For guaranteeing surface roughness, can suitably increase the thickness of metal platinum or platinum family element coating.
The common feature of two embodiments is exactly to plate fine and close strong erosion-resisting platinum layer, platinum alloy layer, palladium metal layer, palladium alloy layer, titanium coating or titanium alloy layer on electrothermal tube metal sleeve surface, utilize the corrosion resistance of the corrosion-resistant coating raising electrothermal tube of their even compact heat conduction, utilize smooth coating to improve the roughness quality on electrothermal tube surface, reduce fouling.Guarantee the heat conductivility of electrothermal tube, prolong the useful life of electrothermal tube, improve the security performance of electrothermal tube, reduce the electrothermal tube maintenance cost.
Claims (9)
1. electrothermal tube, comprise electrical heating elements (1), and the metal sleeve (2) of described electrical heating elements (1) socket, be positioned at the heat-conducting insulation material (3) between described electrical heating elements (1) and the metal sleeve (2), it is characterized in that: described metal sleeve (2) surface directly is coated with one deck platinum layer (4) or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer.
2. electrothermal tube according to claim 1 is characterized in that: the surface roughness of described platinum layer (4) or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is less than 0.8 μ m.
3. electrothermal tube according to claim 1 is characterized in that: the thickness of described platinum layer (4) or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is greater than 0.2 μ m.
4. according to the described electrothermal tube of claim 1, it is characterized in that: described metal sleeve (2) adopts stainless steel material to make.
5. according to the described electrothermal tube of claim 1, it is characterized in that: in the described platinum layer (4), the content of platinum is higher than 75%.
6. according to the described electrothermal tube of claim 1, it is characterized in that: in the described titanium coating, the content of titanium is higher than 95%.
7. electrothermal tube, comprise electrical heating elements (1), metal sleeve (2) with described electrical heating elements (1) socket, be positioned at the heat-conducting insulation material (3) between described electrical heating elements (1) and the metal sleeve (2), it is characterized in that: be coated with one deck nickel coating (5) on the surface of described metal sleeve (2), or nickel compound coating, or silvering, or silver compound coating, in described nickel coating (5), or nickel compound coating, or silvering, or silver compound coating is coated with one deck platinum layer (4) outward again, or platinum alloy layer, or palladium metal layer, or palladium alloy layer, or titanium coating, or titanium alloy layer.
8. electrothermal tube according to claim 7, it is characterized in that: the thickness of described nickel coating (5) or nickel compound coating or silvering or silver compound coating is not less than 2 μ m, and the thickness of described platinum layer or platinum alloy layer or palladium metal layer or palladium alloy layer or titanium coating or titanium alloy layer is not less than 0.3 μ m.
9. electrothermal tube according to claim 8 is characterized in that: described titanium coating thickness is not less than 0.2 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201146120U CN201639803U (en) | 2010-02-03 | 2010-02-03 | Electric heating pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201146120U CN201639803U (en) | 2010-02-03 | 2010-02-03 | Electric heating pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201639803U true CN201639803U (en) | 2010-11-17 |
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ID=43084311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201146120U Expired - Fee Related CN201639803U (en) | 2010-02-03 | 2010-02-03 | Electric heating pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201639803U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105307300A (en) * | 2015-11-25 | 2016-02-03 | 王丽霞 | Improved water heater electric heating pipe |
| CN105444404A (en) * | 2015-10-26 | 2016-03-30 | 重庆光煦科技有限公司 | Efficient solar water heater |
| CN107511648A (en) * | 2017-09-25 | 2017-12-26 | 广东恒美电热科技股份有限公司 | Ooze titanium electric heating tube and its method of manufacturing technology |
| CN111378942A (en) * | 2018-12-28 | 2020-07-07 | 芜湖美的厨卫电器制造有限公司 | Anti-corrosion treatment process for metal surface, metal workpiece, electric heating pipe and electric water heater |
-
2010
- 2010-02-03 CN CN2010201146120U patent/CN201639803U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444404A (en) * | 2015-10-26 | 2016-03-30 | 重庆光煦科技有限公司 | Efficient solar water heater |
| CN105307300A (en) * | 2015-11-25 | 2016-02-03 | 王丽霞 | Improved water heater electric heating pipe |
| CN107511648A (en) * | 2017-09-25 | 2017-12-26 | 广东恒美电热科技股份有限公司 | Ooze titanium electric heating tube and its method of manufacturing technology |
| CN111378942A (en) * | 2018-12-28 | 2020-07-07 | 芜湖美的厨卫电器制造有限公司 | Anti-corrosion treatment process for metal surface, metal workpiece, electric heating pipe and electric water heater |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101117 Termination date: 20180203 |