TWI487427B - Electric heater - Google Patents

Description

Electric heater

The invention relates to an electric heater.

Electric heaters convert electrical energy into heat, which warms the surrounding environment and heats the surrounding environment. The heating element in the electric heater is a heating element. By applying a certain voltage to the heating element, a current flows in the heating element, and the electric energy is converted into Joule heat by the heating element, thereby heating the surrounding environment. .

The heating elements of the prior electric heaters are usually formed by wire, such as chrome-nickel wire, copper wire, molybdenum wire or tungsten wire, by being laid on a substrate or wound on a support. However, the electric heater using the wire as the heating element has the following disadvantages: First, the wire has a large density and a heavy weight. Therefore, the electric heater has a large weight, and the wall has a large bearing capacity, which is liable to cause damage to the wall. Second, when the wire is used as the heating element, the diameter of the wire is small, and it is difficult to prepare an electric heater with a large area, so the heating area of the electric heater is limited.

In view of this, it is necessary to provide an electric heater that is light in weight and has a large heating area.

An electric heater includes a base, a bracket and a handpiece. The bracket is fixed to the base. The handpiece is movably coupled to the bracket. The handpiece includes a support structure, a heating module and a protection structure. The heating module is disposed on the support structure, and the heating module includes a heating element and at least two electrodes, and the at least two electrodes are respectively electrically connected to the heating element. The electric heater includes two protection structures. The support structure is disposed between the two protection structures. The two protection structures and the support structure form a space, and the heating module is disposed inside the space. The support structure includes a surface, and the heating element is disposed on the support node The surface of the structure, the heating element comprises a carbon nanotube layered structure comprising a plurality of carbon nanotubes.

Compared with the prior art, the electric heater provided by the present invention adopts a carbon nanotube layer structure as a heating element, and has the following advantages: First, the carbon nanotube has a small density, so the heating element is light in weight. Therefore, the electric heater is light in weight and convenient to use; secondly, the heating element is a carbon nanotube layer structure, and the carbon nanotube layer structure can have a large area, therefore, the electric heater The heating area is large.

10,20,30,40,50‧‧‧electric heater

12,22,32,42,52‧‧‧Base

122,222,322,422,522‧‧‧Power plug

124,224,324,424,524‧‧‧Control switch

14,24,34,44,54‧‧‧ bracket

142,242,342,442,542‧‧‧ activities

16,26,36,46,56‧‧‧ nose

160,260,360,460,560‧‧‧Support structure

1602, 2602, 3602, 4602, 5602‧‧‧ Connections

162,262,462,562‧‧‧heating module

1620, 2620, 4620, 5620‧‧‧ heating elements

1622, 2622, 4622, 5622‧‧ electrodes

164,264,564‧‧‧protective structure

212‧‧‧reflective layer

214‧‧‧Insulation

362‧‧‧First heating module

366‧‧‧second heating module

3620‧‧‧First heating element

3660‧‧‧Second heating element

3622‧‧‧First electrode

3662‧‧‧second electrode

3604‧‧‧ first surface

3606‧‧‧ second surface

364,464‧‧‧First protection structure

368,468‧‧‧Second protective structure

4604‧‧‧First side panel

4606‧‧‧Second side panel

4608, 4610‧‧ hole

5604‧‧‧ recess

1 is a schematic exploded view of an electric heater provided by a first embodiment of the present invention.

2 is a scanning electron micrograph of a carbon nanotube film taken by a heating element in an electric heater provided by a first embodiment of the present invention.

3 is a scanning electron micrograph of a carbon nanotube flocculation film used in a heating element in an electric heater provided by a first embodiment of the present invention.

4 is a scanning electron micrograph of a carbon nanotube rolled film used for a heating element in an electric heater provided by a first embodiment of the present invention.

FIG. 5 is a schematic exploded view of an electric heater provided by a second embodiment of the present invention.

FIG. 6 is a schematic exploded view of an electric heater provided by a third embodiment of the present invention.

FIG. 7 is a schematic exploded view of an electric heater provided by a fourth embodiment of the present invention.

FIG. 8 is a schematic exploded view of an electric heater provided by a fifth embodiment of the present invention.

Hereinafter, an electric heater according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, an electric heater 10 according to a first embodiment of the present invention is shown. The electric heater 10 includes a base 12, a bracket 14 and a head 16 mounted on the bracket 14.

The base 12 includes a power plug 122 and a control switch 124. The power plug 122 is used to electrically connect the external power source, so that the entire electric heater 10 is in an energized state. The control switch 124 is used to control the operating state of the electric heater 10, including the operating temperature of the electric heater 10, the working time, and the heating direction of the head 16.

The bracket 14 is used to support the handpiece 16 and to connect the handpiece 16 and the base 12. One end of the bracket 14 is provided with a movable device 142. The movable device 142 can control the handpiece 16 to rotate 360 degrees in the horizontal direction. The inside of the bracket 14 is provided with an electrical system (not shown) for controlling the operation of the entire electric heater 10. In this embodiment, the bracket 14 is a sleeve type bracket, and the head 16 can be moved in the vertical direction by adjusting the height of the bracket 14.

The head 16 includes a support structure 160, a heating module 162 and a protection structure 164. The support structure 160 includes a connecting portion 1602 that is movably coupled to the movable device 142 at one end of the bracket 14. The support structure 160 is used to support and fix the heating module 162. The heating module 162 is located between the protection structure 164 and the support structure 160.

The shape of the support structure 160 is not limited, and may be a non-porous plate-like structure, a plurality of orifice-like structures or a frame-like structure. The material of the support structure 160 is an insulating material, including glass, ceramic, plastic or wood materials. The support structure 160 may also be a conductive material whose surface is coated with an insulating material, such as stainless steel, metal, or the like. In this embodiment, the support structure 160 is a non-porous plate-like structure. The thickness of the support structure 160 is not limited, and is preferably 1 mm to 2 cm. When the electric heater 10 is of an ultra-thin structure, the support structure 160 has a thickness of 10 micrometers to 1 millimeter. The size of the support structure 160 is not limited and can be customized according to the size of the heating space.

The heating module 162 is disposed on the support structure 160 and supported by the support structure 160. The heating module 162 includes a heating element 1620 and at least two electrodes 1622. The heating element 1620 is secured to a surface of the support structure 160. The heating element 1620 may be adhered to the surface of the support structure 160 by a bonding agent, or may be fixed to the surface of the support structure 160 by mechanical fixing such as a bolt or the like. In this embodiment, the heating element 1620 is adhered to the surface of the support structure 160 by a bonding agent (not shown). The at least two electrodes 1622 are electrically coupled to the heating element 1620. The at least two electrodes 1622 can be disposed on the same surface or different surfaces of the heating element 1620. In this embodiment, at least two electrodes 1622 are located on the same surface of the heating element 1620, are fixed by a conductive adhesive, and are electrically connected to the circuitry inside the bracket 14 through electrode leads (not shown).

The heating element 1620 includes a carbon nanotube layered structure including at least one layer of carbon nanotube film. When the carbon nanotube layered structure includes at least two layers of carbon nanotube film, the at least two layers of carbon nanotube film are stacked or arranged side by side. The carbon nanotube membrane comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are tightly bonded by van der Waals force. The carbon nanotubes in the carbon nanotube film are disordered or ordered. The disordered arrangement here means that the arrangement direction of the carbon nanotubes is irregular, and the ordered arrangement here means that at least the arrangement direction of the plurality of carbon nanotubes has a certain regularity. Specifically, when the carbon nanotube film comprises a disordered arrangement of carbon nanotubes, the carbon nanotubes are intertwined or isotropically aligned; when the carbon nanotube layered structure comprises an ordered arrangement of carbon nanotubes The carbon nanotubes are arranged in a preferred orientation in one direction or in a plurality of directions. When the carbon nanotubes in the layered structure of the carbon nanotubes are arranged in an order, the arrangement direction of the carbon nanotubes may be perpendicular to the direction in which the electrodes 1622 are arranged. In this embodiment, preferably, the carbon nanotube layer structure comprises a plurality of stacked carbon nanotube films, and the carbon nanotube layer structure preferably has a thickness of 0.5 nm to 1 mm. The carbon nanotube layered structure has a heat capacity per unit area of less than 2 x 10 ^-4 joules per square centimeter Kelvin. Preferably, the carbon nanotube layer structure has a heat capacity per unit area of less than or equal to 1.7 x 10 ^-6 joules per square centimeter Kelvin. It can be understood that the thermal response speed of the carbon nanotube layered structure is related to its thickness. In the case of the same area, the greater the thickness of the carbon nanotube layered structure, the slower the heat response speed; conversely, the smaller the thickness of the carbon nanotube layered structure, the faster the heat response speed.

The carbon nanotube film may be a carbon nanotube film obtained by pulling the carbon nanotube array. Referring to FIG. 2, the carbon nanotube film comprises a plurality of carbon nanotubes which are oriented in the same direction and aligned parallel to the surface of the carbon nanotube film. The carbon nanotubes are connected end to end by Van der Waals force. The carbon nanotube film comprises a plurality of continuous and aligned carbon nanotube segments. The plurality of carbon nanotube segments are connected end to end by Van der Valli. Each of the carbon nanotube segments includes a plurality of mutually parallel carbon nanotubes, and the plurality of mutually parallel carbon nanotubes are closely connected by a van der Waals force. The thickness of the carbon nanotube film is 0.5 nm to 100 μm, and the width is related to the size of the carbon nanotube array for pulling the carbon nanotube film, and the length is not limited. It can be understood that when the carbon nanotube layered structure is composed of a carbon nanotube film, and the thickness of the carbon nanotube layer structure is relatively small, for example, less than 10 micrometers, the carbon nanotube layer structure is very good. Transparency, its light transmittance can reach 90%. When the substrate 102 and the heat insulating plate 104 of the electric heater 100 are made of a transparent material, a transparent electric carbon nanotube layered structure can be used to obtain a transparent electric heater, which is beautiful and elegant. The area of the carbon nanotube film is not limited, and is determined by the size of the carbon nanotube array from which the film is pulled out. When the size of the carbon nanotube array is large, a large area of the carbon nanotube film can be pulled out, so that an electric heater having a larger area can be obtained, thereby making the electric heater have a larger heating. area.

The carbon nanotube flocculation membrane is a carbon nanotube membrane formed by a flocculation method. Referring to FIG. 3, the carbon nanotube flocculation membrane comprises carbon nanotubes which are intertwined and uniformly distributed. The carbon nanotubes are attracted and entangled by van der Waals forces to form a network structure. The carbon nanotube flocculation membrane is isotropic. The length and width of the carbon nanotube film are not limited. Since the carbon nanotubes are intertwined in the carbon nanotube flocculation membrane, the carbon nanotube flocculation membrane has good flexibility and is a self-supporting structure which can be bent and folded into any shape without breaking. . The area and thickness of the carbon nanotube film are not limited, and the thickness is 1 micrometer to 1 mm, preferably 100 micrometers.

The carbon nanotube film may also be a carbon nanotube rolled film formed by rolling an array of carbon nanotubes. The carbon nanotube rolled film comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are arranged in the same direction or in different directions. The carbon nanotubes can also be isotropic. The carbon nanotubes in the carbon nanotube rolled film partially overlap each other and are attracted to each other by the van der Waals force, and are tightly bonded. The carbon nanotubes in the carbon nanotube rolled film form an angle β with the surface of the growth substrate forming the carbon nanotube array, wherein β is greater than or equal to 0 degrees and less than or equal to 15 degrees. The carbon nanotubes in the carbon nanotube rolled film have different arrangements depending on the manner of rolling. Referring to Figure 4, when rolled in the same direction, the carbon nanotubes are arranged in a preferred orientation along a fixed orientation. It can be understood that when crushed in different directions, the carbon nanotubes can be aligned in a plurality of directions. The thickness of the carbon nanotube rolled film is not limited, and is preferably from 1 μm to 1 mm. The area of the carbon nanotube rolled film is not limited, and is determined by the size of the carbon nanotube array that is rolled out of the film. When the size of the carbon nanotube array is large, a large area of the carbon nanotube film can be crushed, so that an electric heater having a larger area can be obtained, thereby making the electric heater more Large heating area.

The at least two electrodes 1622 are disposed on a surface of the heating element 1620. The at least two electrodes 1622 can be disposed on the surface of the heating element 1620 through a conductive adhesive (not shown). The conductive adhesive can also be used to better fix the electrode 1622 to the surface of the heating element 1620. Good electrical contact is maintained between electrode 1622 and heating element 1620. The conductive adhesive can be a silver paste. The at least two electrodes 1622 are made of a conductive material, and the shape thereof is not limited, and may be a conductive film, a metal piece or a metal lead. Preferably, the at least two electrodes 1622 are each a conductive film. When the electric heater 100 is of an ultra-thin structure, the conductive film has a thickness of 0.5 nm to 100 μm. The material of the conductive film may be metal, alloy, indium tin oxide (ITO), germanium Tin oxide (ATO), conductive silver paste, conductive polymer or conductive carbon nanotubes. The metal or alloy material can be an alloy of aluminum, copper, tungsten, molybdenum, gold, titanium, rhodium, palladium, iridium or any combination thereof. In this embodiment, the material of the electrode 108 is a metal palladium film having a thickness of 5 micrometers. The metal palladium has a better wetting effect with the carbon nanotubes, which facilitates good electrical contact between the electrode 1622 and the heating element 1620, and reduces ohmic contact resistance. The at least two electrodes 1622 are electrically connected to the circuitry in the bracket 14 by electrode leads (not shown), respectively.

The electric heater 10 can include a plurality of electrodes electrically coupled to the heating element 1620, the number of which is not limited to achieve selective heating of the heating element 1620 by controlling different electrodes. Any two of the plurality of electrodes can be electrically coupled to an external circuit, respectively, to operate the heating element 1620 electrically coupled between the two electrodes. Preferably, any two adjacent electrodes of the plurality of electrodes are respectively electrically connected to an external power source through electrode leads, that is, electrodes alternately spaced apart are connected to the positive electrode or the negative electrode at the same time, so that heating between each two adjacent electrodes is performed. The components are connected in parallel to each other so that the sheet resistance of the heating element can be reduced.

The protection structure 164 is used to protect the heating element 1620, to prevent the heating element 1620 from being damaged by external pollution, or to prevent the electric heater 100 from causing electric shock damage during use. The material of the protective structure 164 is not limited, and may be an insulating material or a conductive material, and only needs to satisfy the heat resistance. The material of the protective structure 164 may be selected from a conductive material such as a metal or an insulating material such as plastic, rubber or the like. The metal includes one or more of stainless steel, carbon steel, copper, nickel, titanium, zinc, and aluminum. It will be appreciated that when the material of the protective structure 164 is an insulating material, it can be in direct contact with the heating element 1620 and the at least two electrodes 1622. When the material of the protective structure 164 is a conductive material, it should be ensured that the protective structure 164 is spaced from the heating element 1620. The protective structure 164 can be a plurality of pore structures, such as a grid, or a non-porous structure, such as a glass plate or the like. In this embodiment, the protection structure 164 is a groove having a grid structure. The periphery of the protective structure 164 is fixed to the periphery of the support structure 160. A space is formed between the protection structure 164 and the support structure 160. The heating module 162 is disposed inside the space, and the heating module 162 and the protection structure 164 are spaced apart from each other. The fixing structure of the protection structure 164 is not limited and can be fixed by bolts, bonding, riveting, etc. In this embodiment, the protection structure is fixed to the supporting structure 160 through four screw holes (not shown). Since the protective structure 164 is spaced apart from the heating element 1620, the material of the protective structure 164 It can be a conductive material. It can be understood that the conductive material generally has better thermal conductivity. When the material of the protective structure 164 is a conductive material, the electric heater 10 has better heat dissipation effect and higher heating efficiency.

The electric heater 10 provided in this embodiment has the following advantages due to the use of a carbon nanotube layered structure in the heating element 1620. First, the carbon nanotube layered structure includes a plurality of carbon nanotubes, and the carbon carbon. The density of the tube is small, and the weight of the head 16 having the heating element 1620 is relatively light. Therefore, the requirement of the strength of the bracket 14 by the head 16 is not high, and the cost of the electric heater 10 can be reduced, and at the same time, due to the head 16 The weight is lighter, so the electric heater 10 is lighter in weight and more convenient to apply. Secondly, since the carbon nanotube layered structure includes at least one layer of carbon nanotube film, the thickness of the carbon nanotube film can be as small as 0.5 nm, and therefore, the electric heater 10 can be made ultra-thin. The structure, the space occupied by the application is small, and is particularly suitable for use in a room with a small space and is more beautiful. Third, the carbon nanotube layered structure is composed of a carbon nanotube film, and since the carbon nanotube film having a relatively large area can be obtained relatively easily, the carbon nanotube layered structure can have a large area. The electric heater 10 having a large heating area can be obtained in a simple process. Fourth, the carbon nanotube layered structure has a black body structure, and the heat is transmitted in the form of heat radiated electromagnetic waves, and can emit infrared electromagnetic waves.

Referring to FIG. 5, a second embodiment of the present invention provides an electric heater 20. The electric heater 20 includes a base 22, a bracket 24 and a handpiece 26 mounted on the bracket 24. The base 22 includes a power plug 222 and a control switch 224. The bracket 24 is used to support the handpiece 26. One end of the bracket 24 is provided with a movable device 242. The movable device 242 can control the handpiece 26 to rotate 360 degrees in the horizontal direction. The inside of the bracket 24 is provided with an electrical system (not shown) for controlling the operation of the entire electric heater 20. Since the height of the bracket 24 is adjustable, the height of the head 26 supported by the bracket 24 in the vertical direction can be adjusted. The handpiece 26 includes a support structure 260, a heating module 262, and a protection structure 264. The support structure 260 includes a connecting portion 2602 that is movably coupled to the movable device 242 at one end of the bracket 204. The heating module 262 is located between the support structure 260 and the protection structure 264. The heating module 262 includes a heating element 2620 and two electrodes 2622. The heating element 2620 includes a carbon nanotube layered structure.

The electric heater 20 provided in this embodiment is electrically connected to the first embodiment. The structure of the heater 100 is substantially the same, and the difference is that the electric heater 200 of the present embodiment includes a reflective layer 212 and an insulating layer 214 disposed between the support structure 260 and the heating module 262. The reflective layer 212 is disposed on a surface of the support structure 260 , the insulating layer 214 is disposed on a surface of the reflective layer 212 , and the heating module 262 is disposed on a surface of the insulating layer 214 . That is, the support structure 260, the reflective layer 212, the insulating layer 214, and the heating module 262 are sequentially disposed to form a plurality of layers.

The heat reflecting layer 212 is configured to reflect the heat emitted by the heating element 2620, such that the heat is effectively diverged toward the side away from the supporting structure 260, and the electric heater 20 is heated on one side. The material of the heat reflecting layer 212 may be a white insulating material such as a metal oxide, a metal salt, or a ceramic. The heat reflective layer 212 can also be a conductive material such as a metal, including silver, aluminum, aluminum, gold or alloys. The thickness of the heat reflective layer 212 is not limited, and is preferably 1 micrometer to 1 millimeter. In this embodiment, the material of the heat reflective layer 212 is an aluminum foil having a thickness of 0.1 mm. The insulating layer 214 is used to insulate the heat reflecting layer 212 from the heating element 2620. It can be understood that when the material of the heat reflecting layer 212 is an insulating material, it is not necessary to provide the insulating layer 214 between the heat reflecting layer 212 and the heating element 2620. The material of the insulating layer 214 is an insulating material such as ceramic, plastic, glass, or the like. The thickness of the insulating layer 214 is not limited, and is preferably 1 micrometer to 1 millimeter. In this embodiment, the material of the insulating layer 214 is ceramic and has a thickness of 10 micrometers. The surface of the insulating layer 214 adjacent to the heating element 2620 may further include a patterned structure composed of at least one recess (not shown) or a convex portion (not shown), and the heating element 2620 corresponds to the recess or the convex portion. The position is at least partially suspended. The shape of the concave portion or the convex portion on the surface of the insulating layer 214 is a dot shape or a linear shape. Preferably, the plurality of dot structures are evenly distributed on the surface of the insulating layer 214, and the plurality of linear structures are parallel and spaced apart from each other on the surface of the insulating layer 214. The patterned structure of the insulating layer 214 can partially suspend the heating element 2620, reduce the contact area of the heating element 2620 with the insulating layer 214, prevent the heat generated by the heating element 2620 from being absorbed by the insulating layer 214, and affect the heating of the electric heater 20. effectiveness.

The electric heater 20 provided in this embodiment is provided with a heat reflecting layer 212 between the supporting structure 260 and the heating element 2620, so that the heat generated by the heating element 206 is diverged toward the side away from the supporting structure 260. The heating element 2620 comprises a carbon nanotube layered structure comprising a plurality of carbon nanotubes. It is understood that the heat generated by the carbon nanotubes is mainly electromagnetic In the form of wave propagation, the heat reflecting layer 212 can effectively reflect heat to the other direction for heat transmitted in the form of electromagnetic waves, thereby improving the efficiency of single-sided heating of the electric heater 20 while protecting the support structure 260. Preventing damage to the support structure 260 when the temperature generated by the carbon nanotube layered structure is high.

Referring to FIG. 6, a third embodiment of the present invention provides an electric heater 30. The electric heater 30 includes a base 32, a bracket 34 and a head 36 mounted on the bracket 34. The base 32 includes a power plug 322 and a control switch 324. The bracket 34 is used to support the handpiece 36. One end of the bracket 34 is provided with a movable device 342. The movable device 342 can control the handpiece 36 to rotate 360 degrees in the horizontal direction. The height of the bracket 314 is adjustable, and the head 36 can also be moved in the vertical direction. The inside of the bracket 34 is provided with an electrical system (not shown) for controlling the operation of the entire electric heater 30.

The head 36 includes a support structure 360, a first heating module 362, and a first protection structure 364. The support structure 360 includes a connecting portion 3602 that is movably coupled to the movable device 342 at one end of the bracket 34. The support structure 360 includes a first surface 3604 and a second surface 3606 opposite the first surface 3604. The first heating module 362 is disposed on the first surface 3604 of the support structure 360 between the first surface 3604 and the first protection structure 364. The first heating module 362 includes a first heating element 3620 and two first electrodes 3622. The first heating element 3620 includes a carbon nanotube layered structure.

The electric heater 30 provided in this embodiment is basically the same as the electric heater 10 provided in the first embodiment. The difference is that the electric heater 30 further includes a second heating module 366 and A second protection structure 368. The second heating module 366 and a second protection structure 368 are disposed on the handpiece 36. The second heating module 366 is disposed on the second surface 3606 of the support structure 360 between the second surface 3606 and the second protection structure 368. The second heating module 366 includes a second heating element 3660 and two second electrodes 3662. The second heating element 3660 includes a carbon nanotube layered structure. The structure of the second heating module 366 is the same as that of the first heating module 362. The structure of the second protection structure 368 is the same as that of the first protection structure 364.

The electric heater 30 provided in this embodiment can realize the high-efficiency double-sided heating of the electric heater 30 by providing the second heating module 366, and has a large effective heating range. It is suitable for applications in offices, hotel lobbies or conference rooms.

Referring to FIG. 7, a fourth embodiment of the present invention provides an electric heater 40. The electric heater 40 includes a base 42, a bracket 44 and a head 46 mounted on the bracket 44. The base 42 includes a power plug 422 and a control switch 424. The bracket 44 is used to support the handpiece 46. One end of the bracket 44 is provided with a movable device 442. The movable device 442 can control the handpiece 46 to rotate 360 degrees in the horizontal direction. The interior of the bracket 44 is provided with circuitry (not shown) that is responsible for controlling the operation of the entire electric heater 40. The head 46 includes a support structure 460, a heating module 462, a first protection structure 464 and a second protection structure 468. The support structure 460 includes a connecting portion 4602 that is movably coupled to the movable device 442 at one end of the bracket 44. The heating module 462 is disposed on the support structure 460. The heating module 462 includes a heating element 4620 and four electrodes 4622. The heating element 4620 includes a carbon nanotube layered structure having a thickness of less than 10 microns.

The electric heater 40 provided in this embodiment is basically the same as the electric heater 10 provided in the first embodiment, and is different in the shape of the support structure 460, the positional relationship between the heating module 462 and the support structure 460, and the electrode 4622. The number is different from that of the electric heater 10 provided in the first embodiment.

In this embodiment, the support structure 460 is a frame structure including a first side plate 4604 and a second side plate 4606 opposite to the first side plate 4604. The first side plate 4604 and the second side plate 4606 include a plurality of identical holes 4608, 4610, and the holes 4608 on the first side plate 4604 and the holes 4610 on the second side plate 4606 correspond one-to-one. The number of holes 4608 in the first side plate 4604 and the holes 4610 in the second side plate 4606 are equal to the number of electrodes 4622 in the heating module 462. The distance between adjacent holes 4608 on the first side panel 4604 is equal, and the distance between adjacent holes 4610 on the second side panel 4606 is equal. In this embodiment, the number of the electrodes 4622 is four. Therefore, the number of the holes 4608 on the first side plate 4604 and the holes 4610 on the second side plate 4606 are respectively four.

The four electrodes 4622 of the heating module 462 are all wires. The two ends of each electrode 4622 are respectively fixed to the holes 4608 on the first side plate 4604 and the holes 4610 on the second side plate 4606 corresponding to the holes 4608. The distance between the four electrodes 4622 is equal and parallel to each other. The heating element 4620 is disposed on the electrode 4622, and the electrode 4622 is located on the surface of the heating element 4620. In the present embodiment, the electrode 4622 supports the heating element 4620, and the heating element 4620 is suspended. The four electrodes 4622 are electrically connected to the circuitry inside the bracket 44 by electrode leads, respectively.

The support structure 460 is disposed between the first protection structure 464 and the second protection structure 468. The first protection structure 464 and the second protection structure 468 are respectively transparent glass plates. Since the support structure 460 is a frame structure, the first protection structure 464 and the second protection structure 468 form a space with the support structure 460, and the heating module 462 is located inside the space.

The heating element 4020 of the electric heater 40 provided in this embodiment is suspended by the electrode 4622. Since the heating element 4620 is a carbon nanotube layer structure, the thickness of the carbon nanotube layer structure is less than 10 micrometers, which is very good. The transparency, the light transmittance can reach 90%, and the first/second protection structures 464, 468 are respectively transparent glass plates. Therefore, the electric heater 40 is a transparent electric heater, which does not block the line of sight and is elegant in application. . Moreover, since the heating element 4620 is suspended, the heating element 4620 can effectively dissipate heat in two directions, and the heating efficiency of the electric heater 40 is high.

Referring to FIG. 8, a fifth embodiment of the present invention provides an electric heater 50. The electric heater 50 includes a base 52, a bracket 54 and a head 56 mounted to the bracket 54. The base 52 includes a power plug 522 and a control switch 524. The bracket 54 is used to support the handpiece 56. One end of the bracket 54 is provided with a movable device 542. The movable device 542 can control the handpiece 56 to rotate 360 degrees in the horizontal direction. The interior of the bracket 54 is provided with circuitry (not shown) that is responsible for controlling the operation of the entire electric heater 50. The head 56 includes a support structure 560, a heating module 562, and a protection structure 564. The support structure 560 includes a connecting portion 5602 that is movably coupled to the movable device 542 at one end of the bracket 54. The heating module 562 is located between the support structure 560 and the protection structure 564. The heating module 562 includes a heating element 5620 and two electrodes 5622. The heating element 5620 is located on a surface of the support structure 560. The heating element 5620 includes a carbon nanotube layered structure.

The electric heater 50 provided in this embodiment is basically the same as the electric heater 10 provided in the first embodiment, except that the support structure 560 in the electric heater 50 provided in this embodiment is close to the heating element 5620. The surface is further patterned to include at least one recess that opens toward the heating element 5620 or at least one protrusion that is convex toward the heating element, such that The heating element 5620 is at least partially suspended by the at least one recess or protrusion. The shape of the recess or the projection is not limited. The maximum depth of the recess is less than or equal to the thickness of the support structure 560. When the maximum depth of the recess is equal to the thickness of the support structure 560, the recess is a through slot. When the maximum depth of the recess is less than the thickness of the support structure 560, the recess is a blind slot. The protrusion and the support structure 560 may be integrally formed or may not be integrally formed. The surface of the support structure 560 adjacent to the heating element 5620 may include a plurality of concave or convex patterned structures. The shape of the patterned structure is not limited. Preferably, the patterned structure includes a plurality of spaced apart dot structures. Or a plurality of linear structures, even if the support structure 560 is in point or line contact with the heating element 5620. Further, the plurality of linear structures may be disposed in parallel with each other. The dot structure may be a circular, square, triangular or other irregular shape having a small area. The linear structure may be a strip shape or a strip shape having a small width. The plurality of concave portions or convex portions may be uniformly distributed or randomly distributed, and therefore, the dot structures or the linear structures may be uniformly distributed or randomly distributed. In this embodiment, the support structure 560 includes a plurality of cylindrical recesses 5604 having a depth equal to the thickness of the support structure 560, that is, the recesses 5604 are through-hole structures.

The electric heater 50 provided in this embodiment can make the heating element 5620 correspond to the concave portion or the convex portion by providing at least one concave portion facing the opening of the heating element 5620 or at least one convex portion protruding toward the heating element on the surface of the supporting structure 560. The position is at least partially suspended, and since the heating element 5620 includes a carbon nanotube layered structure, the heat generated by the carbon nanotube layered structure propagates in the form of heat radiated electromagnetic waves, when the carbon nanotube layered structure is suspended The heating element 5620 has a higher heating efficiency.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

40‧‧‧Electric heater

42‧‧‧Base

422‧‧‧Power plug

424‧‧‧Control switch

44‧‧‧ bracket

442‧‧‧Active devices

46‧‧‧ nose

460‧‧‧Support structure

4602‧‧‧Connecting Department

462‧‧‧ heating module

4620‧‧‧ heating element

4622‧‧‧electrode

464‧‧‧First protection structure

468‧‧‧Second protective structure

4604‧‧‧First side panel

4606‧‧‧Second side panel

4608, 4610‧‧ hole

Claims (10)

An electric heater includes: a base; a bracket fixed to the base; and a head, the head is movably fixed to the bracket, the head includes a support structure, and at least one heating module The at least one heating module is disposed on the support structure, the heating module includes a heating element and at least two electrodes, the at least two electrodes are respectively electrically connected to the heating element; and the improvement is that the electric heater The utility model comprises two protection structures, the support structure is disposed between the two protection structures, the two protection structures and the support structure form a space, the heating module is disposed inside the space, and the support structure comprises A surface, the heating element is disposed on a surface of the support structure, the heating element comprises a carbon nanotube layer structure, and the carbon nanotube layer structure comprises a plurality of carbon nanotubes. The electric heater according to claim 1, wherein the plurality of carbon nanotubes are substantially parallel to each other and arranged in the same direction. The electric heater of claim 2, wherein the at least two electrodes are spaced apart from each other, and an axial direction of the plurality of carbon nanotubes extends along one electrode toward the other electrode. The electric heater of claim 1, wherein the carbon nanotube layered structure comprises at least one carbon nanotube film. The electric heater according to claim 4, wherein the carbon nanotubes in the carbon nanotube film are connected end to end by van der Waals force. The electric heater according to claim 4, wherein the carbon nanotubes in the carbon nanotube film are arranged in a preferred orientation in substantially the same direction. The electric heater as claimed in claim 1 , wherein the electric heater comprises two heating modules, and the two heating modules are respectively disposed on two opposite surfaces of the support structure. The electric heater according to claim 1, wherein the support structure is a frame structure including a first side plate and a second side plate opposite to the first side plate, the at least two electrodes being fixed to Between the first side panel and the second side panel. The electric heater according to claim 8, wherein the carbon nanotube layered structure is suspended on the at least two electrodes. The electric heater according to claim 1, wherein the two protection structures are structures having a repeating hole.