CN1804494A - Dual-insulation high-efficiency safety electric water heater - Google Patents
Dual-insulation high-efficiency safety electric water heater Download PDFInfo
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- CN1804494A CN1804494A CN 200510134956 CN200510134956A CN1804494A CN 1804494 A CN1804494 A CN 1804494A CN 200510134956 CN200510134956 CN 200510134956 CN 200510134956 A CN200510134956 A CN 200510134956A CN 1804494 A CN1804494 A CN 1804494A
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Abstract
The invention relates to a dual-insulation high-efficiency safety electric water heater, belonging to the household apparatus. It comprises a water storage inner container inside the case; a bended electric heating tube inside the inner container; and a control circuit connecting the electric heating tube. Wherein, said electric heating tube is inserted in the heat conductive insulation sheath whose inner space matches the shape of electric heating tube; said heat conductive insulation sheath is through the metallic mounting end cap to be inserted into the metallic support tube whose shape matches the shape of said sheath; the end of said metallic support tube is sealed and welded with the metallic mounting end cap; and the outer screw of mounting end cap is sealed and screwed with the inner screw of the mounting hole of inner container. Compared to present technique, the invention can avoid change the former structure of water heater with lower cost, and it can form dual insulation outside the electric heating tube and at the connection with the inner container to avoid the electric leakage.
Description
Technical field
The present invention relates to a kind of electric heater, especially a kind of have to improve by insulation system guarantee safe electric heater, belong to household electrical appliance technical field.
Background technology
Electric heater is easy to use, has significantly improved quality of life, is therefore applied.Existing electric heater mainly by the control circuit on the housing, be placed in the water storage liner in the shell, the electric heating device that is installed in the inner bag constitutes.In order both to be convenient to install, reduce self power density again, existing electric heater generally adopts the U-shaped electric heater.
In order to prevent electric leakage, guarantee safe in utilizationly, designers mainly focus one's attention on except taking the earthing of casing, setting up the measure such as anti-electric drainage tube, to electric leakage root--electrical heating has proposed the various double insulated safety measures that are provided with.Yet through intensive research, the applicant finds that all there is weak point in the double insulation structure of existing electric heater.
For example, application number is that the utility model patent of CN94218994.9 discloses between heating element heater and shell filling as the structure of superinsulation heat transfer medium, thereby make heater have the double insulation function, its major defect is that structure is not compact, is contained in the inner bag and will occupies bigger space, and consider from technological angle, because can't carry out undergauge handles, therefore be difficult to guarantee to fill densification, and if contain air in the packing material, tube wall explosion in being easy to cause use.The disclosed double insulation electric heater of CN97224405.0 covers one deck uniform inorganic glued membrane continuously at common metal electrothermal tube outer surface; seamlessly be encapsulated in the metal-coating then; thereby between live part and outer layer metal sheath, constitute dual earth leakage protective; this patent has overcome the shortcoming of last patent; but obviously only be applicable to straight tube; be difficult on the U-shaped electrothermal tube, realize; and, be easy to generate crackle after the use and lose insulating properties because the thermal coefficient of expansion and the metal tube of inorganic glued membrane have than big-difference.
The disclosed double insulation structure of CN99234598.7 and CN99234808.0 Chinese patent is by metal tube and be coated with the glass tube of Electric radiant Heating Film and constitute, and its technology more complicated also is difficult to realize on tortuous electrothermal tubes such as U-shaped.
Experiment shows, the electric heating device of above-mentioned existing double insulation structure is because all deficiencies that self exist, all can not satisfy GB4706.1 " safety of family expenses and the similar applications electrical equipment " standard that issue is carried out that is about to well, especially can't on tortuous electric heating device, realize, thereby when both satisfying the reinforced insulation requirement, still keep good heating properties.
In addition, above-mentioned improvement is connected with the insulation of water heater liner electric heating device and does not propose substantial improvement, even therefore adopt the double insulation structure, still has the weak link of electric leakage.
Summary of the invention
Primary and foremost purpose of the present invention is: at the many disadvantages of above-mentioned prior art existence, propose the tortuous electrothermal tube of a kind of suitable employing, can keep the dual-insulation high-efficiency safety electric water heater of good heat conductive performance and compact conformation simultaneously at reinforced insulation, thereby increase under the limited prerequisite at cost, guarantee that effectively the concerned countries standard-required is satisfied in the security of electric heater.
Further aim of the present invention is: propose the dual-insulation high-efficiency safety electric water heater that a kind of electric heating device and inner bag rationally are connected, thereby further guarantee the security of electric heater.
In order to reach above primary and foremost purpose, dual-insulation high-efficiency safety electric water heater of the present invention comprises the water storage liner that is placed in the shell, be installed in tortuous electrothermal tube in the inner bag, connect the control circuit of electrothermal tube, described electrothermal tube is inserted in the heat conductive insulating sleeve pipe that interior shape and electrothermal tube envelope profile coincide substantially, and described heat conductive insulating sleeve pipe adopts the heat conductive insulating ceramic material of tight sintering to make.Above heat conductive insulating ceramic material is a kind of in aluminium oxide, aluminium nitride, silicon nitride, black crystalline substance, magnesia, carborundum, the no expansion ceramic similar materials such as (2LiO+2AL2O3+5SiO2).
This sleeve structure is the tortuous electrothermal tube that generally adopted in electric heater such as suitable U-shaped very, and structure is very compact, is more or less the same with the electrothermal tube volume of original individual layer insulation.Closely the heat conductive insulating ceramic material of sintering can be not moistening by water, and whole electric heater not only still has good heating properties, and insulating properties have had double shield, can satisfy every request of national standard.
In order to reach further aim of the present invention, described heat conductive insulating sleeve pipe passes metal and end cap is installed tightly is inserted in the identical metallic support pipe of interior shape and heat conductive insulating sleeve pipe profile, the tail end of described metallic support pipe and metal are installed end cap end face seal welding, and the internal thread sealing of the external screw thread of described installation end cap and inner bag installing hole screws.
During installation, screw in the installing hole of water heater liner and get final product end cap is installed, not only very convenient, and also forming same double insulation with the inner bag junction, so avoided anti-creeping weak link.
Experiment showed, that sleeve structure of the present invention can overcome the following problem of prior art:
1, not fragile--the double insulation structure (for example CN94218994.9) that has filling insulation heat transfer medium between heating element heater and shell now is difficult to adopt draw technology, so have air gap unavoidably in the heat transfer medium that insulate, because of expanding, air causes booster easily after the heating; Apply the double insulation structure (for example CN97224405.0) of Electric radiant Heating Film at coating inorganic glued membrane on the metal tube or on glass tube,, therefore crackle occurs and damage because of heating repeatedly easily because it is bigger with the base material thermal expansion coefficient difference to film; There is not above prior art problems in heat conductive insulating sleeve pipe of the present invention, even therefore long-term the use can not damaged yet;
2, double insurance--the double insulation of above filling insulation heat transfer medium class is when the outer tube seepage, and water will infiltrate the insulation heat transfer medium, and the insulating properties of whole electric heating device is reduced greatly; The double insulation structure of the class of filming also will lose insulation effect when crackle occurring, influence overall performance; Double insulation of the present invention then can not produce harmful effect mutually: when the nexine insulation breakdown, outer unaffected; When the metallic support tube damage of outside, insulating sleeve can not reduce insulating properties, therefore has the insulation effect of dual fail-safe;
3, tolerance dry combustion method--existing various double insulation structures when water heater under anhydrous situation during non-normal working, will burn because of metal tube, resistance wire blows and damage; In the double insulation structure of the present invention, the heat conductive insulating sleeve pipe not only self has certain thermal capacity, and can in time heat be delivered to outside metallic support pipe, the metallic support pipe then can reject heat to surrounding air by bigger surface area when dry combustion method, the reasonable sealing that end cap and inner bag are installed in addition screws structure and also has the effect of conducting heat to wall of inner container, so the present invention can resist dry combustion method.
In a word, the present invention can form complete double insulation, has overcome the shortcoming that prior art exists from many aspects, therefore has significant substantive distinguishing features and outstanding progress.
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 sectional view of Fig. 1 embodiment.
Fig. 3,4,5,6 is respectively the sectional view of other embodiment.
The specific embodiment
Embodiment one
The dual-insulation high-efficiency safety electric water heater of present embodiment is a preference, main by the control circuit on the housing, be placed in the water storage liner in the shell, the U-shaped electrothermal tube that is installed in the inner bag is formed.Except that electric heating device, other parts are identical with existing electric heater, and are practical.
Electric heating device as shown in Figure 1, 2, the basic structure of electrothermal tube 1 is identical with the common electrical heat pipe, and resistance wire 2 is housed in the outer tube 3, the insulating powder 4 of fine and close magnesia and so on behind the wadding warp draw between outer tube and the resistance wire.Different with the common electrical heat pipe is, the cross section of U-shaped electrothermal tube 1 bringing-up section of present embodiment as shown in Figure 2, the semi-circular cross-section electrothermal tube that is closed up by two doublings constitutes, therefore whole U-shaped electrothermal tube close up part just as a cylindrical tube, can tightly be inserted in easily in the cylindrical heat conductive insulating pipe 7 that inner chamber coincide with it.This heat conductive insulating pipe is made by the aluminium oxide heat conductive insulating ceramic material of tight sintering, and each composition in its material is: α-AL2O3＞99.2%, SiO2＜0.4%, MgO＜0.3%, CaO+Fe2O3 trace.This aluminium oxide heat conductive insulating porcelain bushing tightly is inserted in the cylindrical stainless steel stay pipe 6 that interior shape matches with it.
The V-shaped bifurcated of the terminals of U-shaped electrothermal tube 1, the cross section of bifurcated section keep circular, and the heat conductive insulating pipe 7 of this section overcoat is the bell mouth shape that matches with it, and the heat conductive insulating pipe wedging stainless steel of this toroidal is installed in the end cap 10.The tail end of stainless steel stay pipe 6 and installation end cap 10 end face seals welding.The external screw thread that end cap is installed screws with the installing hole 9 internal threads sealing that is welded on the inner bag 8.The binding post of U-shaped electrothermal tube 1 terminals is with insulating sleeve 5 outward.
Facts have proved, the improvement design of present embodiment electric heater heater element is ingenious rationally, the involutory U-shaped electrothermal tube of semicircle is compact conformation not only, outer sleeve regular shape, good manufacturability, and be convenient to guarantee fitting tightly of exterior insulation pipe, stay pipe, thereby make whole electric heating device have desirable thermal conductivity, keep the thermal effect that adds of former electrothermal tube substantially, insulating properties and security then improve greatly, can satisfy the safety standard of national II electric appliances fully, need not earthing or grounding means during use.The long-term use explosion, crackle can not occur yet, therefore can guarantee safe in utilizationly all the time, thoroughly avoids leaky.
It below is contrast experiment's table that can prove present embodiment dual-insulation high-efficiency safety electric water heater insulation heat-conducting property
| The two insulation of sleeve pipe | Fill two insulation | The two insulation of coating | Single insulation | |
| The independence of insulation | Independent.Independence is finished in double insulation; do not influence each other; to the not influence of another layer, can reach duplicate protection behind every layer of insulation breakdown. | Not independent.Double insulation is not independent; behind one deck casing collapse inside; the insulation of outside also destroys, and can not form duplicate protection | Not independent.Double insulation is not independent; behind one deck casing collapse of inside and outside; insulation also destroys, and can not form duplicate protection | Can only play the substance protection, in case insulation breakdown just lost efficacy |
| Superinsulation | Satisfy the requirement of superinsulation | Do not satisfy the requirement of superinsulation | Do not satisfy the requirement of superinsulation | Do not have |
| Electrical strength | Can stand 3750V, the electrical strength of 1min | Can stand 3750V, the electrical strength of 1min | Can stand 3750V, the electrical strength of 1min | Can only stand 1250V, the electrical strength of 1min |
| The thermal efficiency | 96% | 96% | 96% | 97% |
| Anti-dry combustion method | Can stand 1000 the degree high temperature and insulating properties do not reduce | Can stand high temperature | Can't stand high temperature, when standing high temperature, coating ftractures easily and lost efficacy | Can stand high temperature |
As can be seen from the above table, bushing type double insulation electric heater of the present invention is compared with various prior aries, can satisfy every requirement of security appliance standard, and have desirable anti-dry combustion method under the constant substantially prerequisite of the thermal efficiency keeping.
Other embodiment
Except that above-mentioned involutory semicircle electrothermal tube, under the identical situation of basic structure and embodiment one, can also there be multiple variation in the cross section of electrothermal tube, thereby forms other embodiment.
For example, can be as shown in Figure 3, the square-section electrothermal tube that is closed up by two doublings constitutes, whole U-shaped electrothermal tube close up part just as a square column, tightly be inserted in the square-section heat conductive insulating pipe that inner chamber coincide with it.Also can be as shown in Figure 4, the circular cross-section electrothermal tube that is closed up by two doublings constitutes, and the part of closing up of whole U-shaped electrothermal tube tightly is inserted in the inner chamber oval cross section heat conductive insulating pipe that the envelope profile is coincide with it.Can also be as shown in Figure 5, the semi-circular cross-section electrothermal tube that is closed up by two reverse doublings constitutes, and the part of closing up of whole U-shaped electrothermal tube tightly is inserted in the heat conductive insulating pipe of square-section.Or as shown in Figure 6, the square section electrothermal tube that is closed up by two doublings tightly is inserted in the identical with it square-section heat conductive insulating pipe of inner chamber.
More than the outside of each embodiment heat conductive insulating pipe all tightly overlap the stainless steel stay pipe that cross sectional shape coincide with it.Below stainless steel everywhere also can use common steel tube surface enamel coating or anticorrosion surface-treated layer or other anticorrosion metal material to replace.In addition to the implementation, the present invention can also have many other embodiments.For example, electric heating tube is made spiral U-shaped, W shape etc.; And for example, the heat conductive insulating sleeve pipe also can pass the metal mounting flange and tightly be inserted in the metallic support pipe that interior shape and heat conductive insulating sleeve pipe profile coincide, the tail end of metallic support pipe can be connected by fixedly connected modes such as screw thread, screw, pressing riveted joints with metal mounting flange end face, the sealing of mounting flange end face and inner bag installed surface is connected etc., for another example, the V-shaped bifurcated of the terminals of electrothermal tube has comprised similar vertical 90 degree bifurcateds, U-shaped; Again for another example, for deaeration as far as possible, better heat conduction is filled conductive powder (as MGO) between heating tube and insulation tube or insulation tube and metal-coating, or the like.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (10)
1. dual-insulation high-efficiency safety electric water heater, comprise the water storage liner that is placed in the shell, be installed in tortuous electrothermal tube in the inner bag, connect the control circuit of electrothermal tube, it is characterized in that: described electrothermal tube is inserted in the heat conductive insulating sleeve pipe that interior shape and electrothermal tube envelope profile coincide substantially, and described heat conductive insulating sleeve pipe adopts the heat conductive insulating ceramic material of tight sintering to make.
2. according to the described dual-insulation high-efficiency safety electric water heater of claim 1, it is characterized in that: described heat conductive insulating sleeve pipe passes metal and end cap is installed tightly is inserted in the identical metallic support pipe of interior shape and heat conductive insulating sleeve pipe profile, the tail end of described metallic support pipe and metal are installed end cap end face seal welding, and the internal thread sealing of the external screw thread of described installation end cap and inner bag installing hole screws.
3. according to the described dual-insulation high-efficiency safety electric water heater of claim 1, it is characterized in that: described heat conductive insulating sleeve pipe passes the metal mounting flange and tightly is inserted in the metallic support pipe that interior shape and heat conductive insulating sleeve pipe profile coincide, the tail end of described metallic support pipe is fixedlyed connected with the end face seal of metal mounting flange, and described mounting flange end face and the sealing of inner bag installed surface are connected.
4. according to claim 2 or 3 described dual-insulation high-efficiency safety electric water heaters, it is characterized in that: described heat conductive insulating ceramic material is a kind of in aluminium oxide, aluminium nitride, silicon nitride, black crystalline substance, magnesia, carborundum, the no expansion ceramic.
5. according to the described dual-insulation high-efficiency safety electric water heater of claim 4, it is characterized in that: the semi-circular cross-section electrothermal tube that the bringing-up section of described electrothermal tube is closed up by two doublings constitutes, the described part of closing up tightly is inserted in the cylindrical heat conductive insulating pipe, and described heat conductive insulating pipe tightly is inserted in the cylindrical metal stay pipe.
6. according to the described dual-insulation high-efficiency safety electric water heater of claim 4, it is characterized in that: the square-section electrothermal tube that the bringing-up section of described electrothermal tube is closed up by two doublings constitutes, the described part of closing up tightly is inserted in the heat conductive insulating pipe of square-section, and described heat conductive insulating pipe tightly is inserted in the metallic support pipe of square-section.
7. according to the described dual-insulation high-efficiency safety electric water heater of claim 4, it is characterized in that: the bringing-up section of described electrothermal tube is made of the circular section electrothermal tube of two doublings, described doubling part tightly is inserted in the elliptic cross-section heat conductive insulating pipe, and described heat conductive insulating pipe tightly is inserted in the elliptic cross-section metallic support pipe.
8. according to the described dual-insulation high-efficiency safety electric water heater of claim 4, it is characterized in that: the semi-circular cross-section electrothermal tube that the bringing-up section of described electrothermal tube is closed up by two reverse doublings constitutes, described doubling part tightly is inserted in the heat conductive insulating pipe of square section, and described heat conductive insulating pipe tightly is inserted in the metallic support pipe of square section.
9. according to the described dual-insulation high-efficiency safety electric water heater of claim 5, it is characterized in that: the V-shaped bifurcated of the terminals of described electrothermal tube, the heat conductive insulating pipe of described bifurcated section overcoat is the bell mouth shape that matches with it, and the heat conductive insulating pipe wedging anticorrosion metal of described bell mouth shape is installed in the end cap.
10. according to the described dual-insulation high-efficiency safety electric water heater of claim 9, it is characterized in that: fill conductive powder between described heating tube and insulation tube or insulation tube and the metal-coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101349561A CN100498110C (en) | 2005-12-29 | 2005-12-29 | Dual-insulation electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101349561A CN100498110C (en) | 2005-12-29 | 2005-12-29 | Dual-insulation electric water heater |
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| Publication Number | Publication Date |
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| CN1804494A true CN1804494A (en) | 2006-07-19 |
| CN100498110C CN100498110C (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101349561A Active CN100498110C (en) | 2005-12-29 | 2005-12-29 | Dual-insulation electric water heater |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183059A (en) * | 2011-04-21 | 2011-09-14 | 刘春元 | Radiating unit of directly-heated type electric heater and manufacturing method of radiating unit |
| CN103438569A (en) * | 2013-08-12 | 2013-12-11 | 杭州佐帕斯工业有限公司 | Pump cavity electric heater |
| CN105072712A (en) * | 2015-09-08 | 2015-11-18 | 湖州思创电热科技有限公司 | Heating pipe disassembly and assembly-facilitating structure |
| CN105072724B (en) * | 2015-09-08 | 2018-06-26 | 湖州思创电热科技有限公司 | Without cold end heating tube |
| CN113391182A (en) * | 2021-06-09 | 2021-09-14 | 中车青岛四方车辆研究所有限公司 | IGBT thermal simulation device and semi-physical IGBT thermal simulation system |
| CN114111045A (en) * | 2020-08-28 | 2022-03-01 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater |
-
2005
- 2005-12-29 CN CNB2005101349561A patent/CN100498110C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183059A (en) * | 2011-04-21 | 2011-09-14 | 刘春元 | Radiating unit of directly-heated type electric heater and manufacturing method of radiating unit |
| CN103438569A (en) * | 2013-08-12 | 2013-12-11 | 杭州佐帕斯工业有限公司 | Pump cavity electric heater |
| CN105072712A (en) * | 2015-09-08 | 2015-11-18 | 湖州思创电热科技有限公司 | Heating pipe disassembly and assembly-facilitating structure |
| CN105072724B (en) * | 2015-09-08 | 2018-06-26 | 湖州思创电热科技有限公司 | Without cold end heating tube |
| CN114111045A (en) * | 2020-08-28 | 2022-03-01 | 青岛经济技术开发区海尔热水器有限公司 | Electric water heater |
| CN113391182A (en) * | 2021-06-09 | 2021-09-14 | 中车青岛四方车辆研究所有限公司 | IGBT thermal simulation device and semi-physical IGBT thermal simulation system |
| CN113391182B (en) * | 2021-06-09 | 2022-12-06 | 中车青岛四方车辆研究所有限公司 | IGBT thermal simulation device and semi-physical IGBT thermal simulation system |
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| CN100498110C (en) | 2009-06-10 |
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