CN103090535B - A kind of electric heater unit for heated air - Google Patents
A kind of electric heater unit for heated air Download PDFInfo
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- CN103090535B CN103090535B CN201310053866.4A CN201310053866A CN103090535B CN 103090535 B CN103090535 B CN 103090535B CN 201310053866 A CN201310053866 A CN 201310053866A CN 103090535 B CN103090535 B CN 103090535B
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Abstract
The invention discloses a kind of electric heater unit for heated air, this electric heater unit being used for heated air comprises housing, heating member and heat-insulation layer, described housing is straight-tube shape, which is provided with air inlet and gas outlet, described heating member and heat-insulation layer are fixed on enclosure interior, described heat-insulation layer is cylindric, the side of described heat-insulation layer is fixedly connected with housing, described heat-insulation layer is provided with the air flue of annular distribution around its center line, described air flue runs through whole heat-insulation layer, heating member is distributed with in each air flue, described heating member is provided with fin, described fin twist.Electric heater unit for heated air has wound form gas flow channel, and this structure is conducive to increasing the length of gas flow channel, changes channel design, finally play improve heat exchanger effectiveness, effect that gas is heated evenly.
Description
Technical field
The present invention relates to a kind of electric heater unit for heated air, particularly relate to the electric calorifie installation on the air delivering pipeline being arranged on band pressure.
Background technology
Housing, heat-insulation layer and heating member is mainly comprised for gas in particular for the electric heater unit of air heat in prior art.Heat-insulation layer and heating member are all fixed on enclosure interior, and be provided with the larger through hole of a diameter in heat-insulation layer inside, heating member is positioned at through hole.This heating member gathers in through hole with bending form or resistance wire spiral form structure, and the heating member length therefore in through hole is much larger than via height or through hole girth.Housing is provided with air inlet and gas outlet, and between air inlet and gas outlet, gas flow channel is through through hole, and the air that air inlet like this enters can flow through heating member position, and then exports from gas outlet.
The publication number that such as September 15 in 2010 announces is the Chinese patent of CN101832642A, discloses a kind of electric gas heater.Disclose this electric gas heater in patent document and comprise pressure-bearing shell; Inlet cavity, is placed in the one end in described pressure-bearing shell, is connected with the inlet nipple on described pressure-bearing shell; Outlet cavity, is placed in the other end in described pressure-bearing shell, is connected with the outlet ozzle on described pressure-bearing shell; Heater, is connected between described inlet cavity and described outlet cavity, enters described inlet cavity also through the gas of heater for heating from described inlet nipple; Yin electricity district, is positioned at described pressure-bearing shell inlet cavity side; Electrical penetration, draw from described Yin electricity district, one end is connected with described heater, and one end connects external power source.
When the electric gas heater described in this patented technology uses, gas enters from inlet nipple, flows through inlet cavity, heater, outlet cavity, and finally flow out from outlet ozzle, thus, gas flow channel is just distributed in above-mentioned zone.Gas flow channel is straight-through structure, and gas flow paths length is a bit larger tham the length of electric gas heater; Electric gas heater length limits by pipeline, can only reach finite length, so the gas flow paths of this structure is short, the time of corresponding heated air is just short, and especially under the situation of gas high-speed motion, the heat time is just shorter, it reduces heat exchanger effectiveness.Comparatively large for the passage aperture by gas on heater, gas forms air-flow and obtains heat exchange by only having during heater outside air-flow, and the temperature of air-flow center changes less in very short time, gas is heated uneven.This electric gas heater exist heat exchanger effectiveness low, heat uneven, that heating gained gas temperature fluctuating range is large defect.
Prior art discloses on April 30th, 2008 Chinese patent that publication number is CN101170845A, disclose a kind of electric gas heater in that patent, it comprises heating chamber, by outer sleeve, inner sleeve and end cover, outer sleeve is fixed on end cover, outer sleeve and end cover, outer sleeve is fixed on end cover, and heating chamber is separated into external heat chamber and interior heating chamber by outer sleeve and inner sleeve; The electrical heating elements be fixed on end cover is provided with in this inner sleeve; Outer sleeve is provided with air inlet, and inner sleeve sets out gas port, has two or more to be fixed on the deflection plate of inner sleeve inwall, and this deflection plate relative spacing arranges.In this technical scheme, be provided with the gas flow channel of bending between inner sleeve, outer sleeve, gas flow paths is further bending distribution under the guide effect of deflection plate, extends gas flow channel length thus.Adopt the technical scheme of the gas flow paths design of bending, except above-mentioned patent, be disclose a kind of high-voltage detachable electric heater component in the Chinese patent of CN101504114A at publication number disclosed in 12 days Augusts in 2009, the inner barrel of this high-voltage detachable electric heater component is provided with electrothermal tube, and electrothermal tube is provided with the deflector of Heterogeneous Permutation.When gas enters this high-voltage detachable electric heater component inside, gas, first through air inlet, flows through electrothermal tube place chamber, and bending flowing under the effect of deflector, finally flow out from gas outlet.
Above-mentioned two kinds of technical schemes all adopt the gas flow paths of bending to design, although the gas flow channel comparing through type has the effect extending gas flow paths, but path increases not obvious, compare and adopt the passage of through type to double at the most, heat exchanger effectiveness is still lower, in addition the cross-sectional area of gas flow channel large and in similar rectangle, circle or structure and the distressed structure based on these structures such as oval, the situations such as this deformed finger stretches, reduce but this just local, do not affect the architectural feature that this cross section is comparatively concentrated.Air-flow is formed in gas motion process; Air-flow moves in gas flow channel, and the distance to center outside air-flow is very long, contacts outside it with calandria, air-flow centre position is difficult to contact with calandria, temperature is difficult to be changed in very short time, causes the gas of output to be heated uneven, and the gas temperature fluctuation of output is large.Gas flow rate is fast in the air delivering pipeline of pressure, and when using above-mentioned electric heater unit, gas is just shorter with the time of contact of calandria, therefore heat exchanger effectiveness will reduce greatly, and familiar lacunas is just more obvious.Therefore, electric heater unit of the prior art is only applicable to gas flow rate slowly in air delivering pipeline.
Electric heater unit of the prior art, except above-mentioned technological deficiency, also comprises the shortcoming that thermal losses is large.Heat-insulation layer in electric heater unit plays insulation effect, reduces heat and to shed loss from housing.Because heating member is placed on heat-insulation layer inside by needs, therefore through-hole diameter is configured to higher value, causes the wall thickness of heat-insulation layer little like this.In unit interval, the heat that the heat of the heating member of concentrated setting can maintain much larger than the heat-insulation layer of this wall thickness, makes heat easily run off from housing.So there is obvious loss problem in existing electric heater unit.
Summary of the invention
The technical problem to be solved in the present invention is the length increasing gas flow channel in the confined space, realize gas by change channel design to be heated evenly, reduce the loss that caused by housing distribute heat, the object of the present invention is to provide a kind of heat exchanger effectiveness high, be heated evenly, the electric heater unit for heated air that heat-insulating property is strong.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: this electric heater unit being used for heated air comprises housing, heating member and heat-insulation layer, described housing is straight-tube shape, which is provided with air inlet and gas outlet, described heating member and heat-insulation layer are fixed on enclosure interior, described heat-insulation layer is cylindric, the side of described heat-insulation layer is fixedly connected with housing, described heat-insulation layer is provided with the air flue of annular distribution around its center line, described air flue runs through whole heat-insulation layer, heating member is distributed with in each air flue, described heating member is provided with fin, described fin twist, gap is provided with between described fin and heat-insulation layer.
Only leave the gap for installing between fin and heat-insulation layer, the gas of high-speed motion is difficult to pass through, gas in air flue by time the most unimpeded path be space between fin.Fin is spirality, and it is wrapped on heating member, and so, the gas flow channel being positioned at fin place is the spiral-shaped of wound form.The gas flow paths design of this structure has stereoscopic features, and because fin is very thin, the volume ratio of shared air flue is less, and thus fin farthest can separate air flue, arrives the object fully using air flue space.The gas flow channel length of this structure can reach seven of airway length to octuple, thus considerably increases the length of gas flow channel.
The helical structure of fin is corresponding with gas path cross sections, namely when gas path cross sections is rounded this fin spiral-shaped be circular or gas path cross sections is rectangular time this fin spiral-shaped spiral-shaped for oval for this fin when rectangle or gas path cross sections ovalize.Final air flue is separated to form spiral-shaped gas flow channel under the acting in conjunction of fin and heating member.Use spiral-shaped gas flow channel to compare and use the gas flow channel of bending of the prior art to have the little advantage of pressure loss.
There is closely spaced technical characteristic between adjacent fins in spiral fin, this belongs to flat shape with regard to the cross section determining gas flow channel, the cross section of the air-flow formed in this gas flow channel is flat structure, and therefore, the distance to center outside air-flow is very near.Fin is fixed on heating member, adds the area of dissipation of heating member.When gas and fin contacts, heat can be delivered to air-flow center after being heated outside air-flow at once, so can be implemented in the short time and complete effective heat exchanging process, make air-flow internal and external temperature all consistent.Can except raising heat exchanging efficiency except the gas flow channel optimized, the length increase of gas flow channel also can raising heat exchanging efficiency, because the length increase of gas flow channel makes the time of gas and fin contacts greatly increase, heat exchanger time just increases.
This invention is by by multiple air flues of heater scattering device on a heat-insulation layer, the heat that single heater sends within the unit interval is a bit larger tham the retainable heat of heat-insulation layer around this heater, middle heating member concentrated setting is in a thermal environment compared to existing technology, the heat that the heater of centralized arrangement sends within the unit interval is much larger than the retainable heat of heat-insulation layer, this technical scheme can obviously reduce the wastage, and improves the heat insulation effect of heat-insulation layer.
As preferably of the present invention, described heating member is bending to take the shape of the letter U, and described heating member is provided with straight operate portions and bending connecting portion, and described operate portions is connected with connecting portion, the operate portions of described heating member is arranged in two air flues respectively, and at least one, interval air flue between described two air flues.The radius of the heating member crooked radian of this structure is large, can facilitate the production of heating member, contributes to reducing production cost.Another important function of the heating member of U-shaped structure is can so that by unified for the electrical connector position of the heating member same position being arranged on housing, contribute to the compression-resistant structure strengthening housing like this, this electric heater unit is applicable in the heating operation of gases at high pressure.
As preferably of the present invention, one end of described heat-insulation layer is provided with support, and the connecting portion of described heating member is fixed on support, and the connecting portion of each heating member is spaced on support.Heating member separates each other under the effect of support, each heating member is dispelled the heat unobstructed.
As preferably of the present invention, described operate portions is provided with fin.Working position is in air flue, so this fin concentrates in air flue.Such design realizes necessary heating function under cost-saving prerequisite.
As preferably of the present invention, described heat-insulation layer is provided with six air flues, is provided with three heating members in described heat-insulation layer.The heating power of each heating member is identical; Heat-insulation layer is identical at the thickness at each air flue place, and the retainable heat of institute within the unit interval of the heat-insulation layer outside any one air flue is identical.The total heating power of three heating members is greater than the heating power of any one heating member, so the heat sent within the unit interval when heat that single one heating member sends within the unit interval works than three heating members wants much less simultaneously.The heating member that three take the shape of the letter U is placed in six air flues, and each heating member can receive the insulation effect of the heat-insulation layer of enough wall thickness, so just thoroughly can improve the heat-insulating property of heat-insulation layer.
In technical scheme of the present invention, air flue quantity can be any number, determines air flue quantity according to actual needs.
As preferably of the present invention, described heat-insulation layer is provided with an air flue, and described heating member is provided with straight operate portions, and described working position is in air flue.Because only possess a gas flow channel, so this structure is applicable to the less environment for use of gas flow.
As preferably of the present invention, described heat-insulation layer is provided with an air flue, and described heating member takes the shape of the letter U, described heating member is provided with straight operate portions and bending connecting portion, described operate portions is connected with connecting portion, and described working position is in air flue, and described gas path cross sections is in " ∞ " shape.In this mechanism, the U-shaped structure of heating member is comparatively tight, between the fin in two operate portions closely; There is the restriction of air flue, make fin in air flue, define twice side by side and the gas flow channel be communicated with.This structure is equally applicable to the less environment for use of gas flow.
As preferably of the present invention, described heat-insulation layer is provided with two air flues, and described heating member takes the shape of the letter U, and described heating member is provided with straight operate portions and bending connecting portion, and described operate portions is connected with connecting portion, and described operate portions lays respectively in two air flues.This structure is equally applicable to the less environment for use of gas flow.
Because two operate portions lay respectively in two air flues, therefore connecting portion is in the operating position that can reinforce heating member when being supported effect, as preferably of the present invention, one end of described heat-insulation layer is provided with support, and the connecting portion of described heating member is fixed on support.
As preferably of the present invention, described heat-insulation layer is provided with four air flues, is provided with two heating members in described heat-insulation layer.In this mechanism, gas flow channel quantity has four, therefore goes for the environment for use that gas flow is medium.
The present invention adopts technique scheme: the electric heater unit for heated air has wound form gas flow channel, this structure is conducive to the length increasing gas flow channel, change channel design, finally play the effect improving heat exchanger effectiveness, gas and be heated evenly.Electric heater unit for heated air has heat insulation layer structure and the rational heating member of distributed architecture of optimization, both are combined together rear heat and are dispersed in the multiple position of heat-insulation layer, avoid the situation of the heat-insulation layer heat insulation effect difference concentrating distribute heat to cause because of multiple heating member, thus effectively suppress the loss that caused by housing distribute heat.This electric heater unit being used for heated air has power saving advantages.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.
Fig. 1 is the structural representation I of the first embodiment of a kind of electric heater unit for heated air of the present invention;
Fig. 2 is the structural representation II of the first embodiment of a kind of electric heater unit for heated air of the present invention;
Fig. 3 be the housing of the first embodiment of a kind of electric heater unit for heated air of the present invention with heat-insulation layer in conjunction with schematic diagram I;
Fig. 4 be the housing of the first embodiment of a kind of electric heater unit for heated air of the present invention with heat-insulation layer in conjunction with schematic diagram II;
Fig. 5 is the structural representation of the second embodiment of a kind of electric heater unit for heated air of the present invention;
Fig. 6 is the structural representation of the third embodiment of a kind of electric heater unit for heated air of the present invention;
Fig. 7 be the housing of the third embodiment of a kind of electric heater unit for heated air of the present invention with heat-insulation layer in conjunction with schematic diagram;
Fig. 8 is the structural representation of the 4th kind of embodiment of a kind of electric heater unit for heated air of the present invention;
Fig. 9 be the heat-insulation layer of the 5th kind of embodiment of a kind of electric heater unit for heated air of the present invention and support in conjunction with schematic diagram;
Figure 10 is the structural representation of the 5th kind of embodiment of a kind of electric heater unit for heated air of the present invention.
Detailed description of the invention
The first embodiment of the present invention, as shown in Figure 1,2,3, 4, the electric heater unit for heated air is made up of housing 1, heat-insulation layer 2, heating member.Housing 1 is straight-tube shape structure, and its inside is provided with cavity; One end is gradually footpath tubular construction.Housing 1 is provided with air inlet 3 and gas outlet 4, and air inlet 3 is positioned at housing 1 this end in straight-tube shape, and gas outlet 4 is positioned at this end that housing 1 is gradually footpath tubulose.The center line of air inlet 3 and the central axis of housing 1, the center line of gas outlet 4 overlaps with the center line of housing 1.It is inner that heat-insulation layer 2 is positioned at housing 1, and it is cylindric.Heat-insulation layer 2 is provided with six straight air flues, and air flue runs through whole heat-insulation layer 2.The cross section of each air flue is rounded, and six air flues are distributed on heat-insulation layer 2 in circular centered by heat-insulation layer 2 center line.Heating member is the strip structure taken the shape of the letter U, and it is made up of operate portions 5 and connecting portion 6.The operate portions 5 of heating member is straight shape, and surface is provided with spiral fin 7, between fin 7 and heat-insulation layer 2 from must close to and form gap; Connecting portion 6 bends curved; The two ends of connecting portion 6 are respectively provided with an operate portions 5.As described in Figure 4, heat-insulation layer 2 is provided with air flue I 8, air flue II 9, air flue III 10, air flue IV 11, air flue V 12, air flue VI 13.As shown in Figure 2, always have three heating members and be arranged in housing 1, two operate portions 5 of any one heating member lay respectively in two air flues, and as described in Figure 1, fin 7 is only positioned at air flue.Three heating members are the distributions in " work " shape of heating member I 14, heating member II 15 and heating member III 16, three heating members respectively.Two operate portions 5 of heating member I 14 lay respectively in air flue I 8 and air flue IV 11, are separated with air flue II 9, air flue III 10 between air flue I 8 and air flue IV 11 mutually.Two operate portions 5 of heating member II 15 lay respectively in air flue II 9 and air flue VI 13, interval air flue I 8 between air flue II 9 and air flue VI 13.Two operate portions 5 of heating member III 16 lay respectively in air flue III 10 and air flue V 12, interval air flue IV 11 between air flue III 10 and air flue V 12.Heating member one end is fixed on housing 1 by insulating part, is connected with the supply line of outside.
One end of heat-insulation layer 2 is provided with support 17, and support 17 is fixedly connected on heat-insulation layer 2.Support 17 is provided with three grooves, is the axis parallel of groove I 18, groove II 19 and groove III 20, groove I 18, groove II 19 respectively, and the axis of groove III 20 is vertical with the axis of groove I 18, groove II 19.Groove I 18, groove II 19 degree of depth are identical and be all less than the degree of depth of groove III 20.The connecting portion 6 of heating member II 15 is embedded in groove I 18, and the connecting portion 6 of heating member III 16 is embedded in groove II 19, and heating member I 14 is embedded in groove III 20.Heating member be embedded in heating member after in groove be fixedly connected between on, and under the effect of support 17 heating member spaced apart.
This electric heater unit being used for heated air can be suitable for gas flow rates faster in operating environment.During work, power to heating member, electric energy conversion is heat energy by heating member, and heat distributes at housing 1 inner, is mainly distributed in heat-insulation layer 2 region; It is inner that gas enters housing 1 from air inlet 3.Gas by the process of six air flues constantly and fin 7 and heating member main body carry out heat exchange, reach the object of heating, therefore heated by the gas after air flue, in each air flue, gas collection out mixes behind the territory, area under control, gradually footpath of housing 1, finally discharges from gas outlet 4.Because fin 7 size is slightly smaller than the size of air flue, therefore there is assemblage gap between fin 7 and heat-insulation layer 2.Due to gas flow at high rates, gas is not easily passed through from gap, air-flow mainly passes through from the passage between fin 7, forms wound form gas flow channel thus.This wound form gas flow paths length long enough, therefore gas high-speed motion by time still can obtain enough heat exchanger times, be enough to ensure gas-heated to design temperature.Channel cross-section is flat, very near to the distance of its center outside air-flow, and the temperature of air-flow center while heating up of being heated outside air-flow increases immediately.Due to heat time long enough, so the temperature outside the last air-flow exported is consistent with the temperature of air-flow center position.
As shown in Figure 5, the second embodiment of the present invention, this embodiment and the difference that the first is implemented are heat-insulation layer 2 to be only provided with an air flue; Heating member is only provided with an operate portions, this operate portions is straight, and its two ends are separately fixed on two positions of housing 1, different from the fixed installation position of the heating member in the first embodiment.The operate portions of heating member is provided with spiral fin 7 equally.
As shown in Figure 6,7, the third embodiment of the present invention, the difference of this embodiment and the first embodiment is that heat-insulation layer 2 is provided with the air flue 21 of two cross connections, the centerline parallel between air flue and distance between two center lines is less than air flue radius; A heating member taken the shape of the letter U is only had in this embodiment, heating member is provided with two straight operate portions and a bending connecting portion, this U-shape state is compacter than the U-shape state of the heating member in the first embodiment, and the radius of its connecting portion is less than the radius of the connecting portion of the heating member in the first embodiment.Cross section " ∞ " shape of the air flue 21 on heat-insulation layer 2.The operate portions of heating member is all positioned at air flue and is provided with spiral fin 7 equally above.
As shown in Figure 8, the present invention's the 4th kind of embodiment, the difference of this embodiment and the first embodiment is that heat-insulation layer 2 is provided with two independently air flues, and the working position of a heating member taken the shape of the letter U is in air flue, and the bending connecting portion of this heating member is in one end of heat-insulation layer 2.Heat-insulation layer is provided with support 22, this support 22 is only provided with the groove IV 23 of one corresponding heating member profile, the connecting portion of heating member is embedded in groove IV 23, is fixedly connected with support 22.
As shown in Fig. 9,10, the present invention's the 5th kind of embodiment, the difference of this embodiment and the first embodiment is that heat-insulation layer 2 is provided with four independently air flues, be air flue VII 24 respectively, air flue VIII 25, air flue Ⅸ 26, air flue Ⅹ 27, four air flues are uniformly distributed in the form of a ring around heat-insulation layer 2 center line; Also comprise heating member IV 28 and heating member V 29, each heating member takes the shape of the letter U, and is provided with straight operate portions and bending connecting portion.Two operate portions of heating member IV 28 lay respectively in air flue VII 24, air flue Ⅸ 26, and two operate portions of heating member V 29 lay respectively in air flue VIII 25, air flue Ⅹ 27.It is that vertical configuration distributes that connecting portion and the connecting portion of heating member V 29 of heating member IV 28 intersect.Be provided with support 17 in heat-insulation layer 2 one end, this support 17 is provided with groove V 30 and groove VI 31, and the degree of depth of groove V 30 is greater than the degree of depth of groove VI 31, intersecting vertical between groove V 30 and groove VI 31.The connecting portion of heating member IV 28 is embedded in groove V 30, and the connecting portion of heating member V 29 is embedded in groove VI 31, and two heating members are fixedly connected on support thus.
Claims (3)
1. the electric heater unit for heated air, this electric heater unit being used for heated air comprises housing (1), heating member and heat-insulation layer (2), described housing (1) is in straight-tube shape, which is provided with air inlet (3) and gas outlet (4), it is inner that described heating member and heat-insulation layer (2) are fixed on housing (1), it is characterized in that: described heat-insulation layer (2) is in cylindric, the side of described heat-insulation layer (2) is fixedly connected with housing (1), described heat-insulation layer (2) is provided with the air flue of annular distribution around its center line, described air flue runs through whole heat-insulation layer (2), heating member is distributed with in each air flue, described heating member is provided with fin (7), described fin (7) is only positioned at air flue, described fin (7) twist, gap is provided with between described fin (7) and heat-insulation layer (2), described heating member is bending to take the shape of the letter U, described heating member is provided with straight operate portions (5) and bending connecting portion (6), described operate portions (5) is connected with connecting portion (6), the operate portions (5) of described heating member is arranged in two air flues respectively, and at least one, interval air flue between described two air flues, described heat-insulation layer (2) is provided with six air flues, three heating members are installed in described heat-insulation layer (2).
2. according to claim 1 for the electric heater unit of heated air, it is characterized in that: one end of described heat-insulation layer (2) is provided with support (17), the connecting portion (6) of described heating member is fixed on support (17), and the connecting portion (6) of each heating member is spaced on support (17).
3. according to claim 1 for the electric heater unit of heated air, it is characterized in that: described operate portions (5) is provided with fin (7).
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| CN201310053866.4A CN103090535B (en) | 2013-02-19 | 2013-02-19 | A kind of electric heater unit for heated air |
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| CN201310053866.4A CN103090535B (en) | 2013-02-19 | 2013-02-19 | A kind of electric heater unit for heated air |
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| CN103090535A CN103090535A (en) | 2013-05-08 |
| CN103090535B true CN103090535B (en) | 2015-09-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102015119863A1 (en) * | 2015-11-17 | 2017-05-18 | Borgwarner Ludwigsburg Gmbh | Electric heating device for heating fluids |
| CN107519655B (en) * | 2016-06-22 | 2019-12-13 | 广州市创韦照明灯具有限公司 | Instant heating type heater for smoke sprayer |
| CN108301089A (en) * | 2018-04-07 | 2018-07-20 | 郭柏权 | Elasticizer electric heating unit and elasticizer heater box |
| CN109520125B (en) * | 2018-09-29 | 2020-10-23 | 江苏九州电器有限公司 | Heater for air duct with uniform heating |
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| CN201476297U (en) * | 2009-07-15 | 2010-05-19 | 无锡康宁防爆电器有限公司 | Anti-explosion electric heater |
| CN201547931U (en) * | 2009-09-29 | 2010-08-11 | 黄跃华 | Flat-plate electric heater |
| CN203163236U (en) * | 2013-02-19 | 2013-08-28 | 杭州中亚机械股份有限公司 | Electric heating device for heating gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2916488Y (en) * | 2006-02-15 | 2007-06-27 | 湖南五江轻化集团有限公司 | Squirrel cage type scale-free heater |
| KR200457578Y1 (en) * | 2009-08-14 | 2011-12-26 | 이승룡 | Heating apparatus for gas heating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201476297U (en) * | 2009-07-15 | 2010-05-19 | 无锡康宁防爆电器有限公司 | Anti-explosion electric heater |
| CN201547931U (en) * | 2009-09-29 | 2010-08-11 | 黄跃华 | Flat-plate electric heater |
| CN203163236U (en) * | 2013-02-19 | 2013-08-28 | 杭州中亚机械股份有限公司 | Electric heating device for heating gas |
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