EP2926622A1 - Airflow heater - Google Patents

Airflow heater

Info

Publication number
EP2926622A1
EP2926622A1 EP13830093.4A EP13830093A EP2926622A1 EP 2926622 A1 EP2926622 A1 EP 2926622A1 EP 13830093 A EP13830093 A EP 13830093A EP 2926622 A1 EP2926622 A1 EP 2926622A1
Authority
EP
European Patent Office
Prior art keywords
support
heating
shows
elements
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP13830093.4A
Other languages
German (de)
French (fr)
Other versions
EP2926622B1 (en
Inventor
Federico ZOPPAS
Angelo Irrera
Daniel Cosmin GUREAN
Gianni Palu'
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of EP2926622A1 publication Critical patent/EP2926622A1/en
Application granted granted Critical
Publication of EP2926622B1 publication Critical patent/EP2926622B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/16—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor the conductor being mounted on an insulating base
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the present invention relates to a heating resistor used, for example, in heaters for tumble driers when a flow of hot air needs to be produced.
  • Heaters for heating a flow of air are used, among other applications, in household appliances, such as tumble driers.
  • a heater generally comprises a plurality of resistive wires wound as a spiral longitudinally along their supports arranged parallel to each other, see Fig. .
  • the existing technology includes the use of resistive wires wound as a spiral and supported by insulating supports made of appropriate material, e.g. mica or ceramic. Generally, such supports have a planar development perpendicular to the development axes of said windings.
  • the resistive filament is connected electrically to the connectors accommodated in a specific insulating block by means of appropriately crimped wiring.
  • a safety thermostat is connected in most cases between the external connection and the internal resistive filament.
  • FIG. 1 shows an air flow heater 100 which comprises a plurality of resistive wires 5 wound about longitudinal insulating supports 4, supported, in turn, by other insulating supports 7, generally made of ceramic, and a container 3, a thermostat 18, a thermistor 19, the connection wiring 9, an electric connector 22, and insulating supports 21 made of mica perpendicular thereto.
  • "Flat" insulating supports are three-dimensional supports, one dimension of which is negligible with respect to the two other.
  • the insulating support 4 according to the solution disclosed in DE1615246 tends to be distorted on the long term due to the combined effect of thermal and micro-climatic stresses. Such a distortion leads to temperature concentrations over time and the electric safety distances are reduced.
  • Fig. 5 shows a photograph of the distortions of a resistive element of the prior art
  • Fig. 6 shows a study of the local distortions of the supporting element of the winding, which results, as seen, in a marked bulging of the element itself. This phenomenon is due to the fact that the air flow which strikes the element is not uniform.
  • the power distribution should compensate such a lack of uniformity: the power should be lower where the air flow is lower to avoid concentrations of heat. It is neither convenient nor practical to dose the power as described due to the spiral-shaped architecture of the product.
  • problems are also related to the assembly of the spiral-shaped solution that includes the use of thin metal rods 2 (Fig. 7) which are to be inserted in specific holes of the insulating supports made of mica which are difficult to handle because they are very small and difficult to insert in the corresponding items made of mica. Therefore, the need is felt to make a heating element wound as a spiral about an insulating support element which allows to overcome the aforesaid drawbacks.
  • the present invention thus is directed at reaching the objects described above by providing a device for heating a flow of air for household appliances, according to claim 1 , which device comprises at least one heating element provided with a three-dimensional insulating support, wherein the value of the thickness is much smaller than the value of length A and that of width B, and with a resistive wire wound as a spiral about said support as to essentially define a flat winding, the device being characterized in that the ratio B/A between width B and length A of the insulating support (4) is smaller than 1/4.
  • the pitch of the turns is not uniform, so that the radiated power is locally variable to solve the non-uniformity of the air flow.
  • the insulating support of the winding includes relieving elements arranged longitudinally to contrast said distortions.
  • Fig. 1 shows a heater of the prior art
  • Fig. 2 shows a heating element according to the prior art
  • Fig. 3 shows a resistive wire wound as a spiral on a supporting element according to the prior art, seen from the side;
  • Fig. 4 shows a resistive wire wound as a spiral on a supporting element according to the prior art, seen from the top;
  • Fig. 5 shows a photograph which illustrates the deformations of the insulating support caused by heating
  • Fig. 6 shows a study of the local distortions of an insulating support caused by the lack of uniformity of the air flow which strikes the heating element
  • Fig. 7 shows a detail of the assembly of the heater of the prior art
  • Fig. 8 shows a supporting element of the resistive winding according to the invention
  • Fig. 9 shows a detail of the resistive wire according to the invention.
  • Fig.10A-B shows a detail of the topological arrangement of two heating elements according to the present invention
  • Fig.11A-B shows the assembly and vertical support elements of the heating elements
  • Fig. 12 shows the complete heater 100
  • Fig. 13A-C shows a constructive detail and an assembly sequence of the container made according to the invention
  • Fig. 14 shows the connection system of the resistive wires to the current power wires
  • Fig. 15 shows a detail of the electric connections.
  • Figure 8 shows an embodiment of an insulating support made of mica according to the invention indicated with reference numeral 4.
  • the insulating support 4 made of mica has a flat rectangular shape with a B/A ratio between width and length typically smaller than 1/4; furthermore, appropriate relieving zones 1 which reduce the phenomenon of "bulging" are typically present in the central part of the support 4.
  • Empirical tests have demonstrated that the phenomenon of bulging is much more marked in presence of a continuous (i.e. not relieved) support made of mica. It has been also empirically determined that the phenomenon of bulging disappears when using supports made of mica with a B/A ratio lower than 1/4.
  • the winding operation is easy to implement by means of automatic machinery.
  • the technical solution according to the invention includes the use of a variable winding pitch of the resistive filament on the mica support in order to contrast the phenomenon of lack of temperature uniformity along the insulating element 4 caused by the fact that the air flow which enters into the heating element is not uniform.
  • Fig. 9 shows this type of solution, in which the mutual distance between turns 5-1 is greater than the mutual distance between turns 5-2.
  • a further embodiment of the thermal distribution of the resistive filament is obtained by appropriately offsetting the vertical positions of the heating elements.
  • Fig.10 A shows an arrangement along a transversal plane with respect to the horizontal direction of the air flow between two pairs of heating elements according to the prior art, while Fig. 0B shows the offset arrangement of the same elements according to the present invention.
  • the resistive elements are supported by vertical insulating elements 7 (Fig. 11A-B).
  • the vertical insulating elements 7 are inserted in the insulating supports 4 of the windings 5 by means of a simple snap-fitting mechanism (Fig. 1 A).
  • Fig. 1 B shows the system ready to be inserted in the container shown in Fig. 12.
  • Fig. 3 A-C shows an example of container 3 for accommodating different heating elements, i.e. the various insulating supports made of mica 4 with their respective windings 5 and the subsequent steps of assembling.
  • the container 3 is shaped as a rectangular parallelepiped formed by a bottom 23, two side walls 24 opposite to each other (while the other two side walls are missing to let air in and out) and finally by a removable lid 25 parallel to the bottom.
  • Bayonet-undercut systems are used for assembly as shown in the sequence of figures 13 A-C.
  • the side walls 24 are provided with protruding vertical elements 26 at slots and recesses formed on the lid 25 on which the lid 29 itself is firmly anchored by means of a vertical movement (Fig. 13A) and a horizontal movement (Fig. 13C) of the lid 29 itself.
  • the vertical insulating elements 7, given their particular shape, are fit by means of a bayonet-undercut system onto the lid 25 of the container 3, as shown in the aforesaid sequence 13A-C.
  • an appropriate electric connection system and a particular shape of the horizontal support elements made of mica 5 is provided in order to facilitate the insertion of the vertical support elements 7.
  • Fig. 14 shows an example of horizontal insulating support 5 of the winding of the resistive wire 4 according to the invention. The figure shows that the particular shape 30 of the central and final part of the support 5 to facilitate the insertion of the vertical supports 7.
  • the electric connection in order to facilitate assembly consists of bands 31 for connecting the heating elements to each other and the heating elements to the external supply.
  • the resistive wire 5 is connected directly to the band 31 , which in turn is connected to the power wire 32 which ends with a slot 33. In this manner, the resistive wire is connected directly to the power cables without needing a further wiring, which is costly in terms of time.
  • Fig. 5 shows a detail of this connection.
  • the invention is not limited to household tumble driers, but may be used in any type of device in which the heating of a flow of air is needed.
  • the elements and features illustrated in the various embodiments may be combined remaining within the scope of protection of the present invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

A heating element for a device for heating a flow of air, consisting of an essentially flat-shaped support element made of mica (4) and a resistive wire (5) wound as a spiral about such a support to avoid the distortion of the support (4) caused by its heating, the ratio between width B and length A of the support (4) is smaller than 1/4.

Description

AIR FLOW HEATER
Field of the invention
The present invention relates to a heating resistor used, for example, in heaters for tumble driers when a flow of hot air needs to be produced.
State of the art
Heaters for heating a flow of air are used, among other applications, in household appliances, such as tumble driers. A heater generally comprises a plurality of resistive wires wound as a spiral longitudinally along their supports arranged parallel to each other, see Fig. . In the prior art, the existing technology includes the use of resistive wires wound as a spiral and supported by insulating supports made of appropriate material, e.g. mica or ceramic. Generally, such supports have a planar development perpendicular to the development axes of said windings. The resistive filament is connected electrically to the connectors accommodated in a specific insulating block by means of appropriately crimped wiring. A safety thermostat is connected in most cases between the external connection and the internal resistive filament. The assembly of the windings and of the associated supports is accommodated in an appropriate container, generally shaped as a parallelepiped without the two opposite walls parallel to the development axes of the windings for the passage of the air flow. Fig. 1 , according to the prior art, shows an air flow heater 100 which comprises a plurality of resistive wires 5 wound about longitudinal insulating supports 4, supported, in turn, by other insulating supports 7, generally made of ceramic, and a container 3, a thermostat 18, a thermistor 19, the connection wiring 9, an electric connector 22, and insulating supports 21 made of mica perpendicular thereto. "Flat" insulating supports are three-dimensional supports, one dimension of which is negligible with respect to the two other. Patent publication DE1615246 describes (Fig. 2-4) a heating element in which the resistive wires are wound about flat shaped supports 4 made of mica. The insulating support 4 according to the solution disclosed in DE1615246 tends to be distorted on the long term due to the combined effect of thermal and micro-climatic stresses. Such a distortion leads to temperature concentrations over time and the electric safety distances are reduced. Fig. 5 shows a photograph of the distortions of a resistive element of the prior art and Fig. 6 shows a study of the local distortions of the supporting element of the winding, which results, as seen, in a marked bulging of the element itself. This phenomenon is due to the fact that the air flow which strikes the element is not uniform. In order to contrast such a phenomenon, the power distribution should compensate such a lack of uniformity: the power should be lower where the air flow is lower to avoid concentrations of heat. It is neither convenient nor practical to dose the power as described due to the spiral-shaped architecture of the product. Finally, problems are also related to the assembly of the spiral-shaped solution that includes the use of thin metal rods 2 (Fig. 7) which are to be inserted in specific holes of the insulating supports made of mica which are difficult to handle because they are very small and difficult to insert in the corresponding items made of mica. Therefore, the need is felt to make a heating element wound as a spiral about an insulating support element which allows to overcome the aforesaid drawbacks.
Summary of the invention
It is the primary object of the present invention to make a heating element to be used in household appliances, such as for example tumble driers, which can eliminate the phenomenon of bulging. Another object of the invention is to make a heating element which can implement a non-uniformly dosed power distribution to be able to contrast the non-uniform distribution of the air flow which invests the element. It is a further object of the invention to make a heater which is easy and cost-effective to assemble. The present invention thus is directed at reaching the objects described above by providing a device for heating a flow of air for household appliances, according to claim 1 , which device comprises at least one heating element provided with a three-dimensional insulating support, wherein the value of the thickness is much smaller than the value of length A and that of width B, and with a resistive wire wound as a spiral about said support as to essentially define a flat winding, the device being characterized in that the ratio B/A between width B and length A of the insulating support (4) is smaller than 1/4. Advantageously, the pitch of the turns is not uniform, so that the radiated power is locally variable to solve the non-uniformity of the air flow. Advantageously, the insulating support of the winding includes relieving elements arranged longitudinally to contrast said distortions. The dependent claims describe preferred embodiments of the invention.
Brief description of the figures
Further features and advantages of the present invention will be more apparent in the light of the detailed description of a preferred, but not exclusive, embodiment, of a device shown by way of non-limitative example, with the aid of the accompanying drawings, in which:
Fig. 1 shows a heater of the prior art;
Fig. 2 shows a heating element according to the prior art;
Fig. 3 shows a resistive wire wound as a spiral on a supporting element according to the prior art, seen from the side;
Fig. 4 shows a resistive wire wound as a spiral on a supporting element according to the prior art, seen from the top;
Fig. 5 shows a photograph which illustrates the deformations of the insulating support caused by heating;
Fig. 6 shows a study of the local distortions of an insulating support caused by the lack of uniformity of the air flow which strikes the heating element;
Fig. 7 shows a detail of the assembly of the heater of the prior art;
Fig. 8 shows a supporting element of the resistive winding according to the invention;
Fig. 9 shows a detail of the resistive wire according to the invention;
Fig.10A-B shows a detail of the topological arrangement of two heating elements according to the present invention;
Fig.11A-B shows the assembly and vertical support elements of the heating elements;
Fig. 12 shows the complete heater 100;
Fig. 13A-C shows a constructive detail and an assembly sequence of the container made according to the invention;
Fig. 14 shows the connection system of the resistive wires to the current power wires;
Fig. 15 shows a detail of the electric connections.
The same reference numbers in the figures identify the same elements. Detailed description of a preferred embodiment of the invention
Figure 8 shows an embodiment of an insulating support made of mica according to the invention indicated with reference numeral 4. The insulating support 4 made of mica has a flat rectangular shape with a B/A ratio between width and length typically smaller than 1/4; furthermore, appropriate relieving zones 1 which reduce the phenomenon of "bulging" are typically present in the central part of the support 4. Empirical tests have demonstrated that the phenomenon of bulging is much more marked in presence of a continuous (i.e. not relieved) support made of mica. It has been also empirically determined that the phenomenon of bulging disappears when using supports made of mica with a B/A ratio lower than 1/4. The winding operation is easy to implement by means of automatic machinery. The technical solution according to the invention includes the use of a variable winding pitch of the resistive filament on the mica support in order to contrast the phenomenon of lack of temperature uniformity along the insulating element 4 caused by the fact that the air flow which enters into the heating element is not uniform. Fig. 9 shows this type of solution, in which the mutual distance between turns 5-1 is greater than the mutual distance between turns 5-2. According to this embodiment, it is possible, by means of a simple setup of the winding system, to obtain a different distribution of the resistive filament 5 on the mica support 4, which translates into an appropriate dosing of the power as a function of local ventilation. A further embodiment of the thermal distribution of the resistive filament is obtained by appropriately offsetting the vertical positions of the heating elements. Fig.10 A shows an arrangement along a transversal plane with respect to the horizontal direction of the air flow between two pairs of heating elements according to the prior art, while Fig. 0B shows the offset arrangement of the same elements according to the present invention. The resistive elements are supported by vertical insulating elements 7 (Fig. 11A-B). The vertical insulating elements 7 are inserted in the insulating supports 4 of the windings 5 by means of a simple snap-fitting mechanism (Fig. 1 A). Fig. 1 B shows the system ready to be inserted in the container shown in Fig. 12. Fig. 3 A-C shows an example of container 3 for accommodating different heating elements, i.e. the various insulating supports made of mica 4 with their respective windings 5 and the subsequent steps of assembling. The container 3 is shaped as a rectangular parallelepiped formed by a bottom 23, two side walls 24 opposite to each other (while the other two side walls are missing to let air in and out) and finally by a removable lid 25 parallel to the bottom. Bayonet-undercut systems are used for assembly as shown in the sequence of figures 13 A-C. The side walls 24 are provided with protruding vertical elements 26 at slots and recesses formed on the lid 25 on which the lid 29 itself is firmly anchored by means of a vertical movement (Fig. 13A) and a horizontal movement (Fig. 13C) of the lid 29 itself. Also the vertical insulating elements 7, given their particular shape, are fit by means of a bayonet-undercut system onto the lid 25 of the container 3, as shown in the aforesaid sequence 13A-C. In order to facilitate the assembly process, an appropriate electric connection system and a particular shape of the horizontal support elements made of mica 5 is provided in order to facilitate the insertion of the vertical support elements 7. Fig. 14 shows an example of horizontal insulating support 5 of the winding of the resistive wire 4 according to the invention. The figure shows that the particular shape 30 of the central and final part of the support 5 to facilitate the insertion of the vertical supports 7. The electric connection in order to facilitate assembly consists of bands 31 for connecting the heating elements to each other and the heating elements to the external supply. The resistive wire 5 is connected directly to the band 31 , which in turn is connected to the power wire 32 which ends with a slot 33. In this manner, the resistive wire is connected directly to the power cables without needing a further wiring, which is costly in terms of time. Fig. 5 shows a detail of this connection. The invention is not limited to household tumble driers, but may be used in any type of device in which the heating of a flow of air is needed. The elements and features illustrated in the various embodiments may be combined remaining within the scope of protection of the present invention.

Claims

1. A device (100) for heating a flow of air for apparatuses for household use, comprising at least one heating element provided with a three-dimensional insulating support (4), wherein the value of the thickness is negligible with respect to the value of length A and that of width B, and with a resistive wire (5) wound as a spiral about said support as to essentially define a flat winding, the device being characterized in that the ratio B/A between width B and length A of the insulating support (4) is smaller than 1/4.
2. A device according to claim 1 , wherein relieving elements (1 ) of the strains caused by the heating of said support are inserted along length A of the insulating support (4).
3. A device according to claim 1 , wherein the pitch of the spiral of the resistive wire (5) is variable.
4. A device according to claim 1 , wherein the heating elements are inserted in a container (3) provided with an inlet and an outlet for the air flow.
5. A device according to claim 4, wherein the heating elements are arranged with their longitudinal axis essentially parallel to the inlet and outlet of the container (3) and with the plane represented by the two larger dimensions A and B arranged transversally to the plane of the outlet of the container (3).
6. A device according to claim 5, comprising at least one pair of said heating elements distanced along the width thereof and arranged on two offset planes parallel to the plane represented by the two larger dimensions of the insulated support (4).
7. A device according to the preceding claims, wherein the insulating support (4) is made of mica.
EP13830093.4A 2012-11-30 2013-11-29 Airflow heater Active EP2926622B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000607A ITRM20120607A1 (en) 2012-11-30 2012-11-30 AIR FLOW HEATER
PCT/IB2013/060500 WO2014083540A1 (en) 2012-11-30 2013-11-29 Hairflow heater

Publications (2)

Publication Number Publication Date
EP2926622A1 true EP2926622A1 (en) 2015-10-07
EP2926622B1 EP2926622B1 (en) 2019-09-04

Family

ID=47633366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13830093.4A Active EP2926622B1 (en) 2012-11-30 2013-11-29 Airflow heater

Country Status (6)

Country Link
EP (1) EP2926622B1 (en)
KR (1) KR102117615B1 (en)
CN (1) CN104995992B (en)
IT (1) ITRM20120607A1 (en)
RU (1) RU2663811C1 (en)
WO (1) WO2014083540A1 (en)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1615246B1 (en) 1967-08-18 1973-02-15 Eichenauer Fa Fritz Electrically operated hair dryer of small dimensions
DE2530075B2 (en) * 1975-07-05 1978-02-09 Schehr, Ingo, 6729 Jockgrim ELECTRIC RADIATOR FOR GAS MEDIA
DE3031373A1 (en) * 1980-08-20 1982-04-01 Braun Ag, 6000 Frankfurt Heater element for hot air fan - has wire supporting mica strips, and forming integral body divided by corresponding number of heating wire coils
GB2089626B (en) * 1980-12-11 1984-06-20 Standard Telephones Cables Ltd Electric resistance heating element
FR2838599B1 (en) * 2002-04-11 2004-08-06 Valeo Climatisation ELECTRIC HEATING DEVICE, PARTICULARLY FOR VEHICLE HEATING AND AIR CONDITIONING APPARATUS
DE202004019912U1 (en) * 2003-12-19 2005-03-10 Eichenauer Heizelemente Gmbh & Co. Kg Electrical heating body for gaseous media has plates that can be moved from position with slot entry regions overlapping to position with entry regions covered and expansion regions forming continuous throughway
DE102007003906A1 (en) * 2007-01-19 2008-07-24 Dbk David + Baader Gmbh Heating coil arrangement for heating by-passing gas substances
CN102089589A (en) * 2007-02-20 2011-06-08 西莫塞莱米克斯公司 Gas heating apparatus and methods
RU76192U1 (en) * 2007-12-10 2008-09-10 Общество с ограниченной ответственностью "ЭЛКАД" (ООО "ЭЛКАД") ELECTRIC HEATER CONVECTOR
KR20090076468A (en) * 2008-01-09 2009-07-13 이용순 An oil-electric boiler with different heating effect to time
IT1399252B1 (en) * 2010-04-02 2013-04-11 Irca Spa ELECTRIC AIR HEATER, IN PARTICULAR FOR APPLIANCES

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014083540A1 *

Also Published As

Publication number Publication date
EP2926622B1 (en) 2019-09-04
ITRM20120607A1 (en) 2014-05-31
KR102117615B1 (en) 2020-06-03
WO2014083540A8 (en) 2015-07-02
WO2014083540A9 (en) 2015-08-13
RU2663811C1 (en) 2018-08-10
CN104995992A (en) 2015-10-21
KR20150113951A (en) 2015-10-08
WO2014083540A1 (en) 2014-06-05
CN104995992B (en) 2019-06-04

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