US20100111510A1 - Energy-saving electrothermal blower and a manufacture method of the electrothermal element thereof - Google Patents

Energy-saving electrothermal blower and a manufacture method of the electrothermal element thereof Download PDF

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Publication number
US20100111510A1
US20100111510A1 US11/995,633 US99563307A US2010111510A1 US 20100111510 A1 US20100111510 A1 US 20100111510A1 US 99563307 A US99563307 A US 99563307A US 2010111510 A1 US2010111510 A1 US 2010111510A1
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electrothermal
energy
high temperature
blower
saving
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US11/995,633
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Kam Tao Lo
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F24H3/0423—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between hand-held air guns
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/30—Electric circuitry specially adapted for hair drying devices
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49083—Heater type

Definitions

  • the present invention relates to the field of electrothermal blowers, in particular to an electrothermal blower in which mica lamination is used as a basic material of the heater.
  • An electrothermal blower in accordance with the present invention can be used as an electric blower in hairdressing and as an air heater used for household warming.
  • the electrothermal blower is one of the electrical appliances used widely, and the technical research on the heating element which is one of the key parts thereof is being developed.
  • the heating element used at present is usually various resistance wires or electric heating tubes (See FIG. 1 ).
  • the traditional resistance wire is used as the electrothermal element of the electrothermal blower it has the following disadvantages: the resistance wire is wound on the insulating plate in the blower, hence the resistance of the air is high; to reach the temperature needed for the air on the outlet, the power of the motor must be high, resulting in high energy consumption, high air speed, high noise and uneven heating; the use of a high motor speed leads to a faster wear of the motor. Therefore it has the following defects: a low heating efficiency, a short life and it can not be operated at a low voltage (for example 12 V), etc.
  • the technical problem the invention aims to settle is to overcome the defects existing in the prior art and to provide an electrothermal blower, wherein the heating element thereof is made by use of a heating film adhering to a mica lamination as basic material.
  • Another object of the invention is to provide a method for manufacturing the heating element of the electrothermal blower mentioned above.
  • An energy-saving electrothermal blower is composed of: a shell with an outlet and inlet, a fan and a motor for driving it fixed in the shell; an insulating plate with an electrothermal element in the shell, a connecting circuit for connection of the electrothermal element with a power supply, characterized in that mica is used as the basic material of the electrothermal element and coated or screen printed with a thin layer of high temperature resistant strong glue as a connection layer, and then coated or screen printed with a layer of heating film and an electrode to form the heating element.
  • the main raw material of the slurry of the heating film of the heating element consists of one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium.
  • the slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having the same expansion coefficient as the mica.
  • the wire of said electrothermal element is fixed on the electrode film by a conducting clip.
  • One end of the electrode film is connected with a temperature controller, a fuse and a power switch in series; and the wire of the other end thereof is fixed on the other pole of the power switch by a conducting clip to form an electrical circuit.
  • the arrangement of the electrothermal elements is a grid, a cross or star, a triangle or a diamond in shape.
  • the outlet of said blower is a square, a rectangle, an ellipse, a circle, a taper or a triangle in shape.
  • the total thickness of the heating film of the heating element and the mica lamination is less than 1 mm.
  • the technical scheme used by the inventor also includes the method for manufacturing the electrothermal element of the energy-saving electrothermal blower, and the method includes the following steps:
  • a thin layer of high temperature resistant strong glue is screen printed or coated on each surface of the mica lamination under the condition with a drying system, and then it is dried;
  • the slurry of the heating film which is prepared according to the desirable power and temperature, is screen printed or coated on the surface of the mica lamination with a layer of high temperature resistant strong glue, and then it is dried;
  • the silver electrode film with a regulated ratio is screen printed on both ends of the heating film, and then it is dried to form the heating element.
  • the main raw material of the slurry of the heating film consists of one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium.
  • the slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having the same expansion coefficient as the mica;
  • the drying process in steps a, b and c is carried out at 300° C.
  • said heating element can be formed and then stored in a sealed plastic bag.
  • the energy-saving electrothermal blower in accordance with the present invention can transmit a far infrared ray and the motor is running at low speed and low resistance, thus the consumption of energy can be saved by more than 30%.
  • the mica heating plate is arranged in the same direction as the air outlet of the motor, thus the average exothermic efficiency is high, the radial radiation is less and the temperature is extraordinarily uniform.
  • the electrothermal element of the energy-saving electrothermal blower in accordance with the present invention can transmit a far infrared ray which can be absorbed by the human body without any side effect. Furthermore it can promote hypodermic blood circulation so that hypodermic cells can absorb more nutrition, which has certain effect in view of cosmetology and health.
  • FIG. 1 is a partial structural schematic drawing of an electrothermal blower of the prior art.
  • FIG. 2 is a sectional view of a heating element of a energy-saving electrothermal blower in accordance with the present invention.
  • FIG. 3 is a circuit connection drawing of a heating element of the energy-saving electrothermal blower in accordance with the present invention.
  • FIG. 4 is a partial sectional view of an energy-saving electrothermal blower in accordance with the present invention.
  • FIG. 5 is a partial sectional view of an energy-saving electrothermal blower in accordance with the present invention.
  • FIGS. 6 , 7 and 8 are structural schematic drawings of three arrangements in the shape of a grid of a heating element of the energy-saving electrothermal blower in accordance with the present invention respectively.
  • FIGS. 9 , 10 and 11 are structural schematic drawings of three arrangements in the shape of a cross or star of a heating element of the energy-saving electrothermal blower in accordance with the present invention respectively.
  • FIGS. 12 , 13 and 14 are schematic drawings of three arrangements in the shape of a triangle or diamond of a heating element of the energy-saving electrothermal blower in accordance with the present invention respectively.
  • an energy-saving electrothermal blower is composed of: a shell 1 with an outlet and inlet 4 , a fan and a motor for driving it fixed in the shell 1 ; an insulating plate with an electrothermal element in the shell, a connecting circuit for connection of the electrothermal element with a power supply, and a handle with a switch fixed on one side of the shell 1 .
  • the key technological features in accordance with the present invention are characterized in that mica is used as the basic material of the electrothermal element and coated or screen printed with a thin layer of high temperature resistant strong glue as a connection layer, and then coated or screen printed with a layer of heating film and an electrode to form the heating element.
  • the main raw material of the slurry of the heating film for the heating element consists of one or more of silicon oxide, alumina, silicon carbide, calcium, potassium.
  • the slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having the same expansion coefficient with the mica.
  • the heating film contains many elements such as germanium, silicon and semiconductor ceramic resistant slurry.
  • the resistant slurry does not contain any harmful substances such as lead, mercury, high valence chromium, polybenzoether and acidic benzene.
  • the expansion coefficient of it is the same as the ceramic body.
  • the resistant slurry is coated on the surface of the mica basic material and then is dried at 300° C. to form the heating film adhering to the surface of the mica, and the heating film can produce heat energy and heat energy of far infrared rays when switched on.
  • the wire of said electrothermal element is fixed on the electrode film 3 by a conducting clip 7 .
  • One end of the electrode film is connected with a temperature controller 8 , a fuse 6 and the power switch in series; and the wire of the other end thereof is fixed on the other pole of the power switch by a conducting clip 7 to form an electrical circuit.
  • the total thickness of the heating film of the heating element and the mica lamination is not more than 0.8 mm.
  • the arrangement of the said electrothermal element may be any of several varieties.
  • the arrangement of the electrothermal elements may be a grid in shape. As shown in the drawings 9 , 10 and 11 , the arrangement of the electrothermal elements can be a cross or star in shape. As shown in the drawings 12 , 13 and 14 , the arrangement of the electrothermal elements can be a triangle or a diamond in shape.
  • the outlet of the blower manufactured correspondingly according to the shape of the arrangement of the electrothermal element, may be a square, a rectangle, an ellipse, a circle, a taper or a triangle in shape.
  • the method for manufacturing the electrothermal elements of the electrothermal blower in accordance with the present invention includes the following steps:
  • a thin layer of high temperature resistant strong glue is screen printed on each surface of the mica lamination under the condition with a drying system, and then it is dried at 300° C.;

Abstract

An energy saving electric heating fan and the making method of its electric heating element are disclosed. The electric heating fan includes a blower and a motor driving the blower in a case (1), an insulation base board with some electric heating elements (2) in the case (1), and a connection electric heating elements (2) with a electric circuit for connecting the power supply. The electric heating elements (2) are heating bodies prepared by steps: coating or screen printing a thin layer of high strength glue with high temperature resistant on a mica base material, then coating or screen printing a layer of heating film with electrodes. The adhesive agent of the heating film of the heating bodies is prepared by steps: sintering the main material of silicon oxide, alumina, silicon carbide, calcium, kalium at high temperature and high pressure, smashing and filtrating to produce powder, then mixing with a high temperature resistant organic adhesive agent with the expansion coefficient equal to mica.

Description

    FIELD OF THE INVENTION
  • The present invention relates to the field of electrothermal blowers, in particular to an electrothermal blower in which mica lamination is used as a basic material of the heater. An electrothermal blower in accordance with the present invention can be used as an electric blower in hairdressing and as an air heater used for household warming.
    • BACKGROUND OF THE INVENTION
  • The electrothermal blower is one of the electrical appliances used widely, and the technical research on the heating element which is one of the key parts thereof is being developed. The heating element used at present is usually various resistance wires or electric heating tubes (See FIG. 1). When the traditional resistance wire is used as the electrothermal element of the electrothermal blower it has the following disadvantages: the resistance wire is wound on the insulating plate in the blower, hence the resistance of the air is high; to reach the temperature needed for the air on the outlet, the power of the motor must be high, resulting in high energy consumption, high air speed, high noise and uneven heating; the use of a high motor speed leads to a faster wear of the motor. Therefore it has the following defects: a low heating efficiency, a short life and it can not be operated at a low voltage (for example 12 V), etc.
    • SUMMARY OF THE INVENTION
  • The technical problem the invention aims to settle is to overcome the defects existing in the prior art and to provide an electrothermal blower, wherein the heating element thereof is made by use of a heating film adhering to a mica lamination as basic material.
  • Another object of the invention is to provide a method for manufacturing the heating element of the electrothermal blower mentioned above.
  • The technical scheme used by the inventor to solve the problem mentioned above is as follows:
  • An energy-saving electrothermal blower is composed of: a shell with an outlet and inlet, a fan and a motor for driving it fixed in the shell; an insulating plate with an electrothermal element in the shell, a connecting circuit for connection of the electrothermal element with a power supply, characterized in that mica is used as the basic material of the electrothermal element and coated or screen printed with a thin layer of high temperature resistant strong glue as a connection layer, and then coated or screen printed with a layer of heating film and an electrode to form the heating element.
  • The main raw material of the slurry of the heating film of the heating element consists of one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium. The slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having the same expansion coefficient as the mica.
  • The wire of said electrothermal element is fixed on the electrode film by a conducting clip. One end of the electrode film is connected with a temperature controller, a fuse and a power switch in series; and the wire of the other end thereof is fixed on the other pole of the power switch by a conducting clip to form an electrical circuit.
  • The arrangement of the electrothermal elements is a grid, a cross or star, a triangle or a diamond in shape.
  • The outlet of said blower is a square, a rectangle, an ellipse, a circle, a taper or a triangle in shape. The total thickness of the heating film of the heating element and the mica lamination is less than 1 mm.
  • The technical scheme used by the inventor also includes the method for manufacturing the electrothermal element of the energy-saving electrothermal blower, and the method includes the following steps:
  • A. A thin layer of high temperature resistant strong glue is screen printed or coated on each surface of the mica lamination under the condition with a drying system, and then it is dried;
  • B. The slurry of the heating film, which is prepared according to the desirable power and temperature, is screen printed or coated on the surface of the mica lamination with a layer of high temperature resistant strong glue, and then it is dried;
  • C. The silver electrode film with a regulated ratio is screen printed on both ends of the heating film, and then it is dried to form the heating element.
  • The main raw material of the slurry of the heating film consists of one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium. The slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having the same expansion coefficient as the mica; The drying process in steps a, b and c is carried out at 300° C.
  • After the mica lamination is adhered to the heating film, said heating element can be formed and then stored in a sealed plastic bag.
  • Comparing with the blower in the prior art, the application of the energy-saving electrothermal blower according to the present invention has following advantages:
  • 1. In view of the air strength and energy consumption
      • A. Many heating coils should be wound around the insulating plate in the traditional blower, so the motor should overcome the resistance resulting in high rotational speed, high temperature and high energy consumption.
      • B. The total thickness of the heating plate and the mica lamination of the energy-saving electrothermal blower according to the present invention is only 0.7 mm, so it has large space, low resistance and a desirable air volume can be reached under low rotational speed.
  • 2. In view of noise
      • A. The motor of the traditional blower will produce a noise of more than 80 db under a high rotational speed and resistance.
      • B. The energy-saving electrothermal blower in accordance with the present invention blows in the axial direction; the motor is running almost without resistance and at 30% of the air volume and rotational speed, so the noise is less than 74 db.
  • 3. Energy-saving: the energy-saving electrothermal blower in accordance with the present invention can transmit a far infrared ray and the motor is running at low speed and low resistance, thus the consumption of energy can be saved by more than 30%.
  • 4. The mica heating plate is arranged in the same direction as the air outlet of the motor, thus the average exothermic efficiency is high, the radial radiation is less and the temperature is extraordinarily uniform.
  • 5. The electrothermal element of the energy-saving electrothermal blower in accordance with the present invention can transmit a far infrared ray which can be absorbed by the human body without any side effect. Furthermore it can promote hypodermic blood circulation so that hypodermic cells can absorb more nutrition, which has certain effect in view of cosmetology and health.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a partial structural schematic drawing of an electrothermal blower of the prior art.
  • FIG. 2 is a sectional view of a heating element of a energy-saving electrothermal blower in accordance with the present invention.
  • FIG. 3 is a circuit connection drawing of a heating element of the energy-saving electrothermal blower in accordance with the present invention.
  • FIG. 4 is a partial sectional view of an energy-saving electrothermal blower in accordance with the present invention.
  • FIG. 5 is a partial sectional view of an energy-saving electrothermal blower in accordance with the present invention.
  • FIGS. 6, 7 and 8 are structural schematic drawings of three arrangements in the shape of a grid of a heating element of the energy-saving electrothermal blower in accordance with the present invention respectively.
  • FIGS. 9, 10 and 11 are structural schematic drawings of three arrangements in the shape of a cross or star of a heating element of the energy-saving electrothermal blower in accordance with the present invention respectively.
  • FIGS. 12, 13 and 14 are schematic drawings of three arrangements in the shape of a triangle or diamond of a heating element of the energy-saving electrothermal blower in accordance with the present invention respectively.
    •  DETAILED DESCRIPTION
  • The technical scheme of the present invention will be described using an electrothermal blower as an example combined with the drawings.
  • As shown in the FIGS. 2, 3, 4 and 5, an energy-saving electrothermal blower according to the present invention is composed of: a shell 1 with an outlet and inlet 4, a fan and a motor for driving it fixed in the shell 1; an insulating plate with an electrothermal element in the shell, a connecting circuit for connection of the electrothermal element with a power supply, and a handle with a switch fixed on one side of the shell 1. The key technological features in accordance with the present invention are characterized in that mica is used as the basic material of the electrothermal element and coated or screen printed with a thin layer of high temperature resistant strong glue as a connection layer, and then coated or screen printed with a layer of heating film and an electrode to form the heating element.
  • The main raw material of the slurry of the heating film for the heating element consists of one or more of silicon oxide, alumina, silicon carbide, calcium, potassium. The slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having the same expansion coefficient with the mica. In particular, the heating film contains many elements such as germanium, silicon and semiconductor ceramic resistant slurry. The resistant slurry does not contain any harmful substances such as lead, mercury, high valence chromium, polybenzoether and acidic benzene. The expansion coefficient of it is the same as the ceramic body. The resistant slurry is coated on the surface of the mica basic material and then is dried at 300° C. to form the heating film adhering to the surface of the mica, and the heating film can produce heat energy and heat energy of far infrared rays when switched on.
  • The wire of said electrothermal element is fixed on the electrode film 3 by a conducting clip 7. One end of the electrode film is connected with a temperature controller 8, a fuse 6 and the power switch in series; and the wire of the other end thereof is fixed on the other pole of the power switch by a conducting clip 7 to form an electrical circuit.
  • The total thickness of the heating film of the heating element and the mica lamination is not more than 0.8 mm. The arrangement of the said electrothermal element may be any of several varieties.
  • As shown in the drawings 6, 7 and 8, the arrangement of the electrothermal elements may be a grid in shape. As shown in the drawings 9, 10 and 11, the arrangement of the electrothermal elements can be a cross or star in shape. As shown in the drawings 12, 13 and 14, the arrangement of the electrothermal elements can be a triangle or a diamond in shape.
  • The outlet of the blower, manufactured correspondingly according to the shape of the arrangement of the electrothermal element, may be a square, a rectangle, an ellipse, a circle, a taper or a triangle in shape.
  • The method for manufacturing the electrothermal elements of the electrothermal blower in accordance with the present invention includes the following steps:
  • a. A thin layer of high temperature resistant strong glue is screen printed on each surface of the mica lamination under the condition with a drying system, and then it is dried at 300° C.;
      • b. The slurry of the heating film, which is prepared according to the desirable power and temperature, is screen printed on the surface of the mica lamination and then it is dried at 300° C.;
      • c. A silver electrode film with a regulated ratio is screen printed on both ends of the heating film and then it is dried at 300° C.;
      • d. After the mica lamination is adhered to the heating film, said heating element can be formed and then stored in a sealed plastic bag.

Claims (10)

1. An energy-saving electrothermal blower including a shell (1) with an inlet and outlet (4), a fan and a motor for driving it fixed in the shell (1); an insulating plate with an electrothermal element in the shell; and a connecting circuit for connection of the electrothermal element with a power supply, characterized in that mica is used as a base material of the electrothermal element (2) and is coated or screen printed with a thin layer of high temperature resistant strong glue as a connection layer, and then coated or screen printed with a layer of heating film and an electrode.
2. The energy-saving electrothermal blower according to claim 1, characterized in that the main raw material of a slurry of the heating film includes one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium; and the slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having an expansion coefficient which is the same as an expansion coefficient as the mica.
3. The energy-saving electrothermal blower according to claim 1, characterized in that wire of said electrothermal element is fixed on an electrode film (3) by a first conducting clip (7); one end of the electrode film is connected with a temperature controller (8), a fuse (9) and a power switch in series; and another end thereof is fixed on another pole of the power switch by a second conducting clip (7) to form an electrical circuit.
4. The energy-saving electrothermal blower according to any of claim 1, 2 or 3, characterized in that the electrothermal element (2) is a cross or star in shape.
5. The energy-saving electrothermal blower according to any of claim 1, 2 or 3, characterized in that the electrothermal element (2) is a grid in shape.
6. The energy-saving electrothermal blower according to any of claim 1, 2 or 3, characterized in that the electrothermal element (2) is a triangle or a diamond in shape.
7. The energy-saving electrothermal blower according to any of claim 1, 2 or 3, characterized in that the outlet of the blower is one of a square, a rectangle, an ellipse, a circle, a taper or a triangle in shape.
8. The energy-saving electrothermal blower according to any of claim 1, 2 or 3, characterized in that a total thickness of the heating film and mica is less than 1 mm.
9. A method for manufacturing an electrothermal element of an energy-saving electrothermal blower, comprising:
a. screen printing or coating on each surface of a mica lamination a thin layer of high temperature resistant strong glue and then drying same;
b. screen printing or coating on a surface of the mica lamination a slurry of heating film prepared according to desirable power and temperature with a layer of high temperature resistant strong glue and then drying same;
c. screen printing on both ends of the heating film a silver electrode film with a regulated ratio and then drying same to form the heating element.
10. The method for manufacturing the electrothermal element of the energy-saving electrothermal blower according to claim 9, characterized in that: a main raw material of the slurry of the heating film includes one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium; the slurry being made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having an expansion coefficient which is the same as an expansion coefficient as the mica; and the drying in steps a, b and c is carried out at 300° C.
US11/995,633 2007-06-25 2007-09-26 Energy-saving electrothermal blower and a manufacture method of the electrothermal element thereof Abandoned US20100111510A1 (en)

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CN200710123365.3 2007-06-25
CN200710123365.3A CN101334214A (en) 2007-06-25 2007-06-25 Energy-saving electric heating fan and its electrothermal element manufacture method
PCT/CN2007/002820 WO2009000114A1 (en) 2007-06-25 2007-09-26 Energy saving electric heating fan and the making method of its electric heating element

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US11589661B2 (en) 2017-01-12 2023-02-28 Dyson Technology Limited Hand held appliance

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