CN103090535A - Electric heater device for heating gas - Google Patents
Electric heater device for heating gas Download PDFInfo
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- CN103090535A CN103090535A CN2013100538664A CN201310053866A CN103090535A CN 103090535 A CN103090535 A CN 103090535A CN 2013100538664 A CN2013100538664 A CN 2013100538664A CN 201310053866 A CN201310053866 A CN 201310053866A CN 103090535 A CN103090535 A CN 103090535A
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Abstract
The invention discloses an electric heater device for heating gas. The electric heater device for heating the gas comprises a housing, heating elements and an insulating layer, wherein the housing is in a straight cylinder shape, an air inlet and an air outlet are formed in the housing, the heating element and the insulating layer are fixed in the housing, the insulating layer is cylindrical, one side of the insulating layer is fixedly connected with the housing, air channels which are distributed in a ring shape are arranged on the insulating layer and around the center line of the insulating layer, the air channels penetrate the whole insulating layer, the heating elements are distributed in each air channel, fins are arranged on the heating elements, and the fins are spiral. The electric heater device for heating the gas is provided with wound gas flow channels, the wound gas flow channels is conducive to increasing the lengths of the air flow channels and changing the structures of the channels, at last the electric heater device for heating the gas has the functions of improving the heat exchanging efficiency and enabling the gas to be heated evenly.
Description
Technical field
The present invention relates to a kind of electric heater unit for heated air, relate in particular to and be arranged on the electric calorifie installation of being with on the air delivering pipeline of pressure.
Background technology
Be used for gas in prior art and mainly comprise housing, heat-insulation layer and heating member in particular for the electric heater unit of air heat.Heat-insulation layer and heating member all are fixed on enclosure interior, are provided with a through hole that diameter is larger in heat-insulation layer inside, and heating member is positioned at through hole.This heating member gathers in through hole with bending form or resistance wire spiral form structure, and therefore the heating member length in through hole is much larger than via height or through hole girth.Housing is provided with air inlet and gas outlet, between air inlet and gas outlet gas flow channel through through hole, can flow through heating member position of the air that enters of air inlet like this, and then export from the gas outlet.
The publication number of for example announcing September 15 in 2010 is the Chinese patent of CN101832642A, discloses a kind of electric gas heater.Disclose this electric gas heater in patent documentation and comprised pressure-bearing shell; Inlet cavity is placed in the end in described pressure-bearing shell, is connected with inlet nipple on described pressure-bearing shell; Outlet cavity is placed in the other end in described pressure-bearing shell, is connected with outlet ozzle on described pressure-bearing shell; Heater is connected between described inlet cavity and described outlet cavity, is used for heating and enters described inlet cavity and pass the gas of heater from described inlet nipple; Draw electricity and distinguish, be positioned at described pressure-bearing shell inlet cavity one side; Electrical penetration is drawn from the described electricity district of drawing, and an end is connected with described heater, an end connection external power source.
When the electric gas heater of describing in this patented technology uses, gas advances from inlet nipple, and the inlet cavity of flowing through, heater, outlet cavity flow out from the outlet ozzle at last, and thus, gas flow channel just is 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 is limited 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 heat time heating time is just shorter under the situation of gas high-speed motion, and this has reduced heat exchanger effectiveness.Be used for by the passage aperture of gas greatlyr on heater, gas only has the air-flow outside to obtain heat exchange when forming air-flow by heater, and that the temperature of air-flow center changes in the short time at the utmost point is less, makes gas be heated inhomogeneous.This electric gas heater exists that heat exchanger effectiveness is low, heating is inhomogeneous, heating gained gas temperature fluctuating range large defective.
It is the Chinese patent of CN101170845A that prior art discloses publication number on April 30th, 2008, a kind of electric gas heater is disclosed in this 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 are fixed on end cover, and outer sleeve and inner sleeve are separated into external heat chamber and interior heating chamber with heating chamber; Be provided with the electrical heating elements that is fixed on end cover in this inner sleeve; Outer sleeve is provided with air inlet, and inner sleeve sets out gas port, and the deflection plate that is fixed in the inner sleeve inwall more than two is arranged, and this deflection plate relative spacing is arranged.Be provided with the gas flow channel of bending in this technical scheme between inner sleeve, outer sleeve, gas flow paths is further bending distribution under the guide effect of deflection plate, extends thus gas flow channel length.Adopt the technical scheme of the gas flow paths design of bending, except above-mentioned patent, a kind of high-voltage detachable electric heater component is disclosed in the Chinese patent that on August 12nd, 2009, disclosed publication number was CN101504114A, 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.Gas enters this high-voltage detachable electric heater component when inner, and at first gas pass through air inlet, the electrothermal tube place chamber of flowing through, and bending is flowed under the effect of deflector, flows out from the gas outlet at last.
Above-mentioned two kinds of technical schemes all adopt the gas flow paths design of bending, have although compare the gas flow channel of through type the effect that extends gas flow paths, it is not obvious that but the path increases, compare and adopt the passage of through type to double at the most, heat exchanger effectiveness is still lower, the cross-sectional area of gas flow channel is large and be similar rectangle, circle or the structure such as oval and based on the distressed structure of these structures in addition, the situations such as this deformed finger stretches, dwindles but this are just local, do not affect the architectural feature that this cross section is comparatively concentrated.Form air-flow in the gas motion process; Air-flow moves in gas flow channel, and the air-flow outside is very long to the distance of center, and its outside contacts with calandria, the air-flow centre position is difficult to contact with calandria, temperature is difficult to be changed in the short time at the utmost point, causes the gas of output to be heated inhomogeneous, 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, 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 also comprises the shortcoming that thermal losses is large except above-mentioned technological deficiency.Heat-insulation layer in electric heater unit plays insulation effect, reduces heat from the housing loss that sheds.Because needs are placed on heat-insulation layer inside with heating member, therefore through-hole diameter is configured to higher value, cause like this wall thickness of heat-insulation layer little.In unit interval, the heat that the heat of the heating member of concentrated setting can be kept 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 to increase the length of gas flow channel in the confined space, realize that by changing channel design gas is heated evenly, reduction is by the loss that the housing distribute heat causes, the object of the present invention is to provide a kind of heat exchanger effectiveness high, be heated evenly, the electric heater unit that is used 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: the electric heater unit that should be 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, be provided with the air flue of annular distribution on described heat-insulation layer around its center line, described air flue runs through whole heat-insulation layer, be distributed with heating member in each air flue, described heating member is provided with fin, described fin twist, be provided with the gap between described fin and heat-insulation layer.
Only leave between fin and heat-insulation layer for the gap of installing, the gas of high-speed motion is difficult to pass through, gas in the air flue by the 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 that is positioned at the 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, thereby fin can farthest be separated air flue, the abundant purpose of using the air flue space of arrival.The gas flow channel length of this structure can reach seven of airway length and arrive octuple, thereby has greatly increased the length of gas flow channel.
The helical structure of fin is corresponding with the air flue cross section, and namely this fin spiral-shaped is circular or air flue cross section this fin spiral-shaped for oval when this fin spiral-shaped is for rectangle or air flue cross section ovalize when rectangular when the air flue cross section is rounded.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 advantages of that pressure loss is little.
There is closely spaced technical characterictic between adjacent fins in spiral fin, this belongs to flat shape with regard to the cross section that has determined gas flow channel, the cross section of the air-flow that forms in this gas flow channel is the flat structure, and therefore, the air-flow outside is very near to the distance of center.Fin is fixed on heating member, has increased the area of dissipation of heating member.When gas contacts with fin, can heat be delivered to the air-flow center after the air-flow outside is heated at once, so can realize completing at short notice effective heat exchanging process, make the air-flow internal and external temperature all consistent.Can 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 time that the length increase of gas flow channel makes gas contact with fin increases greatly, heat exchanger time just increases.
This invention is passed through in a plurality of 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 of the present invention preferred, described heating member bending takes the shape of the letter U, and described heating member is provided with straight operate portions and crooked connecting portion, and described operate portions is connected with connecting portion, the operate portions of described heating member is arranged on respectively in two air flues, and one, interval air flue at least 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, helps to reduce production costs.Another important function of the heating member of U-shaped structure is can be so that be arranged on the electrical connector position unification of heating member at the same position of housing, help like this to strengthen the compression-resistant structure of housing, this electric heater unit can be applicable in the heating operation of gases at high pressure.
As of the present invention preferred, an 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 under the effect of support each other, each heating member can be dispelled the heat unobstructed.
As of the present invention preferred, described operate portions is provided with fin.The working position is in air flue, so this fin concentrates in air flue.Such design realizes necessary heating function under the prerequisite of saving cost.
As of the present invention preferred, described heat-insulation layer is provided with six air flues, and three heating members are installed 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 heat-insulation layer retainable heat of institute within the unit interval in any one air flue outside is identical.The total heating power of three heating members is greater than the heating power of any one heating member, so the heat that sends within the unit interval when heat that a single heating member sent within the unit interval is worked simultaneously than three heating members is wanted much less.Three heating members that take the shape of the letter U are placed in six air flues, and each heating member can be received the insulation effect of the heat-insulation layer of enough wall thickness, so just can thoroughly improve the heat-insulating property of heat-insulation layer.
In technical scheme of the present invention, air flue quantity can be any number, determines according to actual needs air flue quantity.
As of the present invention preferred, 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 of the present invention preferred, 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 crooked connecting portion, described operate portions is connected with connecting portion, and described working position is in air flue, and described air flue cross section is " ∞ " shape.In this mechanism, the U-shaped structure of heating member is comparatively tight, and is together adjacent between the fin on two operate portions; The restriction that air flue is arranged makes fin form twice side by side in air flue and the gas flow channel that is communicated with.This structure is equally applicable to the less environment for use of gas flow.
As of the present invention preferred, 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 crooked connecting portion, and described operate portions is connected with connecting portion, and described operate portions is positioned at respectively two air flues.This structure is equally applicable to the less environment for use of gas flow.
Because two operate portions are positioned at respectively two air flues, therefore connecting portion is in to be supported and does the used time and can reinforce the operating position of heating member, as of the present invention preferred, an end of described heat-insulation layer is provided with support, and the connecting portion of described heating member is fixed on support.
As of the present invention preferred, described heat-insulation layer is provided with four air flues, and two heating members are installed in described heat-insulation layer.In this mechanism, gas flow channel quantity has four, therefore goes for the medium environment for use of gas flow.
The present invention adopts technique scheme: the electric heater unit that is used for heated air has the wound form gas flow channel, this structure is conducive to increase the length of gas flow channel, change channel design, finally play and improve the effect that heat exchanger effectiveness, gas are heated evenly.The electric heater unit that is used 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 heat-insulation layer a plurality of positions, avoid the poor situation of heat-insulation layer heat insulation effect of concentrating distribute heat to cause because of a plurality of heating members, thereby effectively suppress the loss that causes by the housing distribute heat.The electric heater unit that should be used for heated air has energy-conservation advantage.
Description of drawings
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 is that the housing of the first embodiment of a kind of electric heater unit for heated air of the present invention is combined the schematic diagram I with heat-insulation layer;
Fig. 4 is that the housing of the first embodiment of a kind of electric heater unit for heated air of the present invention is combined the schematic diagram II with heat-insulation layer;
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 is that the housing of the third embodiment of a kind of electric heater unit for heated air of the present invention is combined schematic diagram with heat-insulation layer;
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.
The specific embodiment
The first embodiment of the present invention, as shown in Fig. 1,2,3,4, the electric heater unit that is used for heated air is comprised of housing 1, heat-insulation layer 2, heating member.Housing 1 is the straight-tube shape structure, and its inside is provided with cavity; One end is footpath tubular construction gradually.Be provided with air inlet 3 and gas outlet 4 on housing 1, air inlet 3 is positioned at this end that housing 1 is straight-tube shape, and gas outlet 4 is positioned at housing 1 and is gradually this end of footpath tubulose.The center line of air inlet 3 is vertical with the center line of housing 1, and the center line of gas outlet 4 overlaps with the center line of housing 1.Heat-insulation layer 2 is positioned at housing 1 inside, 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 circular and are distributed on heat-insulation layer 2 centered by heat-insulation layer 2 center lines.Heating member is the strip structure that takes the shape of the letter U, and it is comprised of operate portions 5 and connecting portion 6.The operate portions 5 of heating member is straight shape, and the surface is provided with spiral fin 7, between fin 7 and heat-insulation layer 2 close to must be and form the gap; Connecting portion 6 is crooked curved; The two ends of connecting portion 6 respectively are 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 only is positioned at air flue.Three heating members are respectively that heating member I 14, heating member II 15 and 16, three heating members of heating member III are the distribution of " work " shape.Two operate portions 5 of heating member I 14 lay respectively in air flue I 8 and air flue IV 11, are separated with mutually air flue II 9, air flue III 10 between air flue I 8 and air flue IV 11.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 respectively groove I 18, groove II 19 and groove III 20, and the axis of groove I 18, groove II 19 is parallel, 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 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.On between after heating member is embedded in groove, heating member is fixedly connected on, and separating between heating member under the effect of support 17.
The electric heater unit that should be used for heated air can be suitable for gas flow rates operating environment faster.During work, power supply is to heating member, and heating member is heat energy with electric energy conversion, and dissipation of heat is in housing 1 inside, mainly is distributed in heat-insulation layer 2 regions; Gas enters housing 1 inside from air inlet 3.Gas by in the process of six air flues constantly and fin 7 and heating member main body carry out heat exchange, reach the purpose of heating, therefore be heated by the gas after air flue, out gas collection mixes behind the territory, area under control, gradually footpath of housing 1 in each air flue, 4 discharges from the gas outlet at last.Be slightly smaller than the size of air flue due to fin 7 sizes, so have assemblage gap between fin 7 and heat-insulation layer 2.Due to the gas flow at high speed, make gas be difficult for passing through from the gap, air-flow mainly passes through from the passage of 7 of fins, forms thus the wound form gas flow channel.This wound form gas flow paths length long enough, thus the gas high-speed motion by the time still can obtain enough heat exchanger times, be enough to guarantee that gas-heated is to design temperature.Channel cross-section is flat, and the air-flow outside is very near to the distance of its center, and being heated outside air-flow, when heating up, the temperature of air-flow center increases immediately.Due to long enough heat time heating time, so the temperature outside the air-flow of last output is consistent with the temperature of air-flow center position.
As shown in Figure 5, the second embodiment of the present invention, the difference that this embodiment and the first are implemented is only to be provided with on heat-insulation layer 2 air flue; Only be provided with an operate portions on heating member, this operate portions is straight, and its two ends are separately fixed on two positions of housing 1, and is different from the fixed installation position of heating member in the first embodiment.Be provided with equally spiral fin 7 on the operate portions of heating member.
As shown in Fig. 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 distance between parallel and two center lines of the center line between air flue is less than the air flue radius; Only has a heating member that takes the shape of the letter U in this embodiment, heating member is provided with the connecting portion of two straight operate portions and a bending, this U-shaped state is compacter than the U-shaped 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 all is positioned at air flue and the top spiral fin 7 that is provided with equally.
As shown in Figure 8, the 4th kind of embodiment of the present invention, 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 that takes the shape of the letter U is in air flue, and the connecting portion of the bending of this heating member is in an end of heat-insulation layer 2.Be provided with support 22 on heat-insulation layer, only be provided with the groove IV 23 of one corresponding heating member profile on this support 22, 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 5th kind of embodiment of the present invention, the difference of this embodiment and the first embodiment is that heat-insulation layer 2 is provided with four independently air flues, respectively that air flue VII 24, air flue VIII 25, air flue IX 26,27, four air flues of air flue X are around the evenly distribution in the form of a ring of heat-insulation layer 2 center lines; 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 crooked connecting portion.Two operate portions of heating member IV 28 are positioned at respectively air flue VII 24, air flue IX 26, and two operate portions of heating member V 29 are positioned at respectively air flue VIII 25, air flue X 27.The connecting portion of the connecting portion of heating member IV 28 and heating member V 29 intersects and is vertical configuration and distributes.Be provided with support 17 at heat-insulation layer 2 one ends, this support 17 is provided with groove V 30 and groove VI 31, and the degree of depth of groove V 30 is intersected vertical greater than the degree of depth of groove VI 31 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 (10)
1. electric heater unit that is used for heated air, the electric heater unit that should be used for heated air comprises housing (1), heating member and heat-insulation layer (2), described housing (1) is straight-tube shape, which is provided with air inlet (3) and gas outlet (4), described heating member and heat-insulation layer (2) are fixed on housing (1) inside, it is characterized in that: described heat-insulation layer (2) is cylindric, the side of described heat-insulation layer (2) is fixedly connected with housing (1), the upper air flue that is provided with annular distribution around its center line of described heat-insulation layer (2), described air flue runs through whole heat-insulation layer (2), be distributed with heating member in each air flue, described heating member is provided with fin (7), described fin (7) twist, be provided with the gap between described fin (7) and heat-insulation layer (2).
2. be used for according to claim 1 the electric heater unit of heated air, it is characterized in that: described heating member bending takes the shape of the letter U, described heating member is provided with straight operate portions (5) and crooked connecting portion (6), described operate portions (5) is connected 6 with connecting portion) connect, the operate portions of described heating member (5) is arranged on respectively in two air flues, and one, interval air flue at least between described two air flues.
3. be used for according to claim 2 the electric heater unit of heated air, it is characterized in that: an end of described heat-insulation layer (2) is provided with support (17), the connecting portion of described heating member (6) is fixed on support (17), and the connecting portion of each heating member (6) is spaced on support (17).
4. be used for according to claim 2 the electric heater unit of heated air, it is characterized in that: described operate portions (5) is provided with fin (7).
5. according to claim 2 or 3 described electric heater units for heated air, it is characterized in that: described heat-insulation layer (2) is provided with six air flues, and three heating members are installed in described heat-insulation layer (2).
6. be used for according to claim 1 the electric heater unit of heated air, it is characterized in that: described heat-insulation layer (2) is provided with an air flue, and described heating member is provided with straight operate portions, and described working position is in air flue.
7. be used for according to claim 1 the electric heater unit of heated air, it is characterized in that: described heat-insulation layer (2) is provided with an air flue (21), described heating member takes the shape of the letter U, described heating member is provided with straight operate portions and crooked connecting portion, described operate portions is connected with connecting portion, described working position is in air flue (21), and described air flue (21) cross section is " ∞ " shape.
8. be used for according to claim 1 the electric heater unit of heated air, it is characterized in that: described heat-insulation layer (2) is provided with two air flues, described heating member takes the shape of the letter U, described heating member is provided with straight operate portions and crooked connecting portion, described operate portions is connected with connecting portion, and described operate portions is positioned at respectively two air flues.
9. be used for according to claim 8 the electric heater unit of heated air, it is characterized in that: an end of described heat-insulation layer (2) is provided with support (22), and the connecting portion of described heating member (6) is fixed on support (22).
10. according to claim 2 or 3 described electric heater units for heated air, it is characterized in that: described heat-insulation layer (2) is provided with four air flues, and two heating members are installed in described heat-insulation layer (2).
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| CN106839397A (en) * | 2015-11-17 | 2017-06-13 | 博格华纳路德维希堡有限公司 | Electric heater unit for heating fluid |
| CN107519655A (en) * | 2016-06-22 | 2017-12-29 | 张明镇 | Instantaneously heated type heater for fog machine |
| CN108301089A (en) * | 2018-04-07 | 2018-07-20 | 郭柏权 | Elasticizer electric heating unit and elasticizer heater box |
| CN109520125A (en) * | 2018-09-29 | 2019-03-26 | 江苏九州电器有限公司 | A kind of air duct heater of homogeneous heating |
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