CN100399863C - Enamel coating heating tube and manufacture for electric water heater - Google Patents
Enamel coating heating tube and manufacture for electric water heater Download PDFInfo
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- CN100399863C CN100399863C CNB2005100376701A CN200510037670A CN100399863C CN 100399863 C CN100399863 C CN 100399863C CN B2005100376701 A CNB2005100376701 A CN B2005100376701A CN 200510037670 A CN200510037670 A CN 200510037670A CN 100399863 C CN100399863 C CN 100399863C
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Abstract
The present invention relates to a heating device used in electric water heaters, and meanwhile, the present invention also relates to a manufacturing method of the heating device. The present invention belongs to the technical field of household appliances. A heating pipe of an enamel coating of an electric water heater of the present invention forms a bent shape, electric heating wires which are isolated from an outer shell of a metal pipe through an insulated terminal are arranged in the heating pipe, the space between the electric heating wires and the outer shell of a metal pipe is filled with insulated heat conducting materials, and the surface of the outer shell of a metal pipe is coated with the enamel layer. The manufacturing method comprises a key step that after the external surface of a metal pipe is coated with enamel coating materials, energized heating temperature and heat preservation time are controlled according to enamel sintering technology through electrical heating. The present invention breaks long-term industrial thinking formulas and traditional technological frames, and the heating pipe of the enamel coating of the electric water heater is realized by means of a simple, artful and reasonable sintering method; consequently, an economic and practical path is opened up for the adequate solution of the problems of corrosion resistance and scale prevention of the electric water heater.
Description
Technical field
The present invention relates to a kind of heater element that is used for electric heater, also relate to the manufacture method of this heater element simultaneously, belong to household electrical appliance technical field.
Background technology
Along with improving constantly of people's quality of life, electric heater has stepped into huge numbers of families, becomes one of the most frequently used household electrical appliance.Heater element wherein is generally crooked electric heating tube, and the heating wire of isolating by insulated terminal and metal tube shell is housed in the pipe, fills the insulating heat-conduction material of magnesium oxide quartz sand and so between heating wire and the metal tube shell.Electric heater is very convenient to use, but the scale removal of electric heating device anticorrosion be a big technical barrier all the time.
In order to address this problem, people are trying every possible means to seek the novel coating material that is applicable to electric heating tube always.Retrieval finds, the Chinese patent application that application number is 00227016.1, name is called " a kind of new electrically heating device " discloses the electric heater that a kind of outer surface scribbles the high temperature resistant non-sticking lining of polytetrafluoroethylene; The Chinese patent application that application number is 01262675.9, name is called " anti-incrustation, anticorrosive liquid electrothermal tube " discloses a kind of electrothermal tube of setting up the fluorocarbon polymer flexible coating on the surface; The Chinese patent application that application number is 01256220.3, name is called " a kind of anticorrosion, antiseized electrothermal tube " discloses the electrothermal tube that a kind of outer surface covers high temperature resistant non-sticking linings such as scribbling polytetrafluoroethylene or import teflon coating.It is introduced that these electrothermal devices can reduce incrustation scale and form, improve pyroconductivity, safe in utilization.
The applicant is in the long-term practice process, recognize through necessary theoretical analysis and experimental verification: adopt traditional electroplating technology or directly adopt corrosion protection material (for example stainless steel) though the electric heating device of making can be antirust, but be difficult to avoid fouling, after using a period of time, the heat efficiency of electric heater can obviously reduce.Teflon coated and so on plasticity non-adhesive material, though have the good antiscale property effect, not only cost is higher, and can't stand to expand with heat and contract with cold repeatedly and long-term hot-water soak, peels off easily after a period of time to come off, useful life is limited.
Have only the enamel coating layer both to have good anticorrosion and good antiscale property effect, insulation, high temperature resistant, and cost economy again.Regrettably, the structure of electric heating tube can't adopt common process to apply enamel.Because if apply enamel after the electric heating tube moulding, the high temperature of sintering process certainly will damage the insulating material in the insulated terminal; And if apply earlier enamel, heating wire in the mounting pipe and insulated terminal again, then electrothermal tube after the draw, BENDING PROCESS in, certainly will destroy enamel layer because of distortion.
Therefore, understand according to the applicant, electric heater was born since over half a century, though new coating material continues to bring out, but never occurred even have no talent and expected the electric heating tube of enamel coating, because can't realize, and formed a kind of mindset of industry gradually---will seek coating material as the unique direction that solves fouling against corrosion.
Summary of the invention
The objective of the invention is to: propose a kind of electric heater enamel coating heating tube that has practicality conscientiously, provide its manufacture method simultaneously, thereby make the electric heater heating tube both have good resistance to corrosion, have desirable good antiscale property performance again, and cost economy is durable in use.
In order to reach above purpose, electric heater enamel coating heating tube of the present invention is bending, the heating wire of isolating by insulated terminal and metal tube shell is housed in the pipe, fills insulating heat-conduction material between heating wire and the metal tube shell, its metal tube case surface is coated with enamel layer.
The manufacture method of above-mentioned electric heater enamel coating heating tube is as follows:
1), heating wire is packed in the metal tube, fills insulating heat-conduction material;
2), two ends install insulated terminal, with heating wire and the isolation of metal tube shell;
3) the metal tube bending forming that, assembling is finished;
4), at the coated enamel paint of metal tube outer surface;
5), the heating of self switching on, press enamel sintering technology controlling and process energising heating-up temperature and temperature retention time, make the coated enamel paint of metal tube outer surface sinter fine and close solid enamel layer into;
Promptly can be made into the electric heater enamel coating heating tube that meets instructions for use fully.
Enrich in order to ensure insulating heat-conduction material, short circuit between heating wire and metal tube shell when avoiding bending forming, in above step 2), 3) between can increase step 3) ', metal tube is elongated undergauge, thereby by dwindling the pipe internal volume, make insulating heat-conduction material enrich space in the pipe.
Above step 4) comprises various coated methods such as soaking enamel slurry, spray enamel slurry and electrostatic spraying enamel powder.
Because during electric heating tube energising heating, the connection electrode resistance of heating wire is very little near the two ends, temperature is not high, therefore can not damage insulated terminal, though can not form sintering enamelled layer herein, but owing to be heating position not herein, do not have the requirement of antiscale when using, do not bring into play due effect so do not influence enamel coating heating tube.
As can be seen, the present invention has broken the long-term industry mindset and the circle of traditional handicraft, with simple, ingenious, rational sintering method, realized the electric heater enamel coating heating tube, for the antiscale problem against corrosion of properly settling electric heater has been opened up an economic, practical approach.
In addition, what deserves to be mentioned is, the not only ingenious problem that solves reasonable heat-agglomerating of method of the present invention self energising heating, and different with traditional enamel sintering ecto-entad heating be that the thermal source from-inner-to-outer produces sintering temperature, enamel layer is sintering gradually from inside to outside, therefore check shows that enamel layer is finer and close, and is more firm with combining of metal tube base material, thereby more help antiscale against corrosion, increase the service life.Since the heating tube surface-coated have the enamel of insulating properties, can effectively reduce the electric current of water tank inner anode protection, reduce the consumption of anode stub, prolong the life-span of guard time and water tank.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the embodiment of the invention one.
Fig. 2 is the structural representation of the embodiment of the invention two.
Embodiment
Embodiment one
Present embodiment is electric heater enamel coating (the claiming golden Gui again) heating tube of 2 kilowatts of power, adopts the following steps manufacturing:
1), the heating wire metal tube of packing into is dashed, fills the quartz sand insulating heat-conduction material;
2), two ends install insulated terminal, with heating wire and the isolation of metal tube shell;
3) ' metal tube is elongated undergauge;
3), the metal tube that assembling is finished bends to U-shaped;
4), to immerse enamel slurry at the metal tube outer surface coated, coating layer thickness is controlled at 0.4～0.6mm;
5), energising heating, press enamel sintering technology controlling and process energising heating-up temperature at 800～900 ℃, temperature retention time 10 minutes (being controlled at usually 8-12 minute) makes the coated enamel paint of metal tube outer surface sinter the solid enamel layer of densification into.
The electric heater enamel coating heating tube of making is as shown in Figure 1: insulated terminal 1 is fixedlyed connected with the metal tube shell 3 of U-shaped bending.The heating wire of isolating with it is housed in the metal tube shell 3, is filled with the quartz sand insulating heat-conduction material between heating wire and the metal tube shell 3.Metal tube shell 3 surface-coated have uniform enamel coating 4, and its thickness is controlled at 0.1～0.4mm usually.Experiment showed, that this coating not only has desirable high temperature resistant, insulation property, and have good anti-incrustation and corrosion resistance, can reduce the depletion rate of anode stub in the water heater liner, keep the heat efficiency of electric heater.
Insulated terminal 1 also is connected with the nipple 2 that is used to install, and therefore can screw on the water tank that is installed in electric heater, and dismounting is all very convenient.
Embodiment two
Present embodiment is 1.5 kilowatts an electric heater enamel coating heating tube, and its manufacture method and embodiment are basic identical, and difference is:
1), metal tube shell 3 bend to L shaped, insulated terminal 1 be connected with the bowl-type bump joint 2 that is used to install;
2), enamel paint adopts the mode of spraying to be coated on L shaped metal tube shell 3 surfaces;
3), because self electrical power is lower, therefore when the energising heating, need take the insulation measure.
Its result of use is identical with embodiment one, does not give unnecessary details in addition.
In addition to the implementation, the present invention can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of requirement of the present invention.
Claims (4)
1. electric heater enamel coating heating tube manufacture method may further comprise the steps:
1), heating wire is packed in the metal tube, fills insulating heat-conduction material;
2), two ends install insulated terminal, with heating wire and the isolation of metal tube shell;
3) the metal tube bending forming that, assembling is finished;
It is characterized in that:
4), at the coated enamel paint of metal tube outer surface;
5), the heating of self switching on, press enamel sintering technology controlling and process energising heating-up temperature and temperature retention time, make the coated enamel paint of metal tube outer surface sinter fine and close solid enamel layer into.
2. according to the described electric heater enamel coating heating tube of claim 1 manufacture method, it is characterized in that: described step 2), 3) between also comprise step 3) ', metal tube is elongated undergauge.
3. according to claim 1 or 2 described electric heater enamel coating heating tube manufacture methods, it is characterized in that: described step 4) coated for soaking enamel slurry, spray one of enamel slurry, electrostatic spraying enamel powder.
4. according to the described electric heater enamel coating heating tube of claim 2 manufacture method, it is characterized in that: described energising heating-up temperature is incubated 8-12 minute at 800～900 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100376701A CN100399863C (en) | 2005-01-11 | 2005-01-11 | Enamel coating heating tube and manufacture for electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100376701A CN100399863C (en) | 2005-01-11 | 2005-01-11 | Enamel coating heating tube and manufacture for electric water heater |
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| Publication Number | Publication Date |
|---|---|
| CN1645972A CN1645972A (en) | 2005-07-27 |
| CN100399863C true CN100399863C (en) | 2008-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100376701A Active CN100399863C (en) | 2005-01-11 | 2005-01-11 | Enamel coating heating tube and manufacture for electric water heater |
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| CN (1) | CN100399863C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102457997A (en) * | 2010-10-14 | 2012-05-16 | 阿里斯顿热能产品(中国)有限公司 | Antibacterial resistor for heating water |
| CN102457998A (en) * | 2010-10-14 | 2012-05-16 | 阿里斯顿热能产品(中国)有限公司 | Resistor with enhanced antibacterial effect for heating water |
| CN104057248A (en) * | 2014-05-31 | 2014-09-24 | 安徽省宁国市天成科技发展有限公司 | New process for producing heating tube for washing machine |
| CN104534672A (en) * | 2014-12-10 | 2015-04-22 | 芜湖恒美电热器具有限公司 | Novel electric heater for water heater |
| CN105352186A (en) * | 2015-10-09 | 2016-02-24 | 芜湖恒美电热器具有限公司 | Heater and electrifying dry burning enamel technology for manufacturing heater |
| CN105499305B (en) * | 2015-12-31 | 2017-06-20 | 上海瓦鲁自动化技术有限公司 | A kind of heating rod enamel sinters automatic production line system |
| CN105744662A (en) * | 2016-01-26 | 2016-07-06 | 广东万家乐燃气具有限公司 | Enamel electric heater and fabrication method thereof |
| CN109163442A (en) * | 2018-08-01 | 2019-01-08 | 江阴市博豪电热电器制造有限公司 | A kind of rubber flexible heater and preparation method thereof |
| 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 |
| CN109827322A (en) * | 2019-03-04 | 2019-05-31 | 芜湖美的厨卫电器制造有限公司 | The preparation method of electric heating assembly, water heater, electric heating assembly |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201035U (en) * | 1987-02-11 | 1988-01-13 | 交通部上海船舶运输科学研究所 | Electric heating type liquid interface level probe |
| CN2118272U (en) * | 1991-10-25 | 1992-10-07 | 赵双福 | Domestic electrothermal pipe type water heater |
| CN2243046Y (en) * | 1996-03-15 | 1996-12-18 | 丛军 | Electric shower device |
| CN2485581Y (en) * | 2001-06-11 | 2002-04-10 | 李宗盛 | Electric heating pipe on pressure resistant enamel lining sole |
| CN2621380Y (en) * | 2003-05-23 | 2004-06-23 | 深圳大学 | Enamel electrothermal pipe |
-
2005
- 2005-01-11 CN CNB2005100376701A patent/CN100399863C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201035U (en) * | 1987-02-11 | 1988-01-13 | 交通部上海船舶运输科学研究所 | Electric heating type liquid interface level probe |
| CN2118272U (en) * | 1991-10-25 | 1992-10-07 | 赵双福 | Domestic electrothermal pipe type water heater |
| CN2243046Y (en) * | 1996-03-15 | 1996-12-18 | 丛军 | Electric shower device |
| CN2485581Y (en) * | 2001-06-11 | 2002-04-10 | 李宗盛 | Electric heating pipe on pressure resistant enamel lining sole |
| CN2621380Y (en) * | 2003-05-23 | 2004-06-23 | 深圳大学 | Enamel electrothermal pipe |
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| CN1645972A (en) | 2005-07-27 |
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