JPH05223342A - Electric heater - Google Patents

Abstract

PURPOSE:To radiate heat from a plate heater and a heat radiation board, increase their radiation areas, reduce the size of the plate heater and enhance heat radiation efficiency by placing the heat radiation board into contact with the plate heater and extending the heat radiation board having a large thermal conductivity along the surface of the heater. CONSTITUTION:When an electric heater is operated, an air supply fan 37 is rotated so that the air may be absorbed from an opening section 35 of the rear side of a main body case 13. After the air has passed through an electrostatic deodorizing filter 36 and a draft 34, it is heated by a ceramic heater 41 and blown off from a hot air outlet 43. On the other hand, a heater main body 21 of a plate heater 17 is heated so as to produce heat, which heats the front side with radiation heat and reflect the heat forward by a reflecting plate 16 on the rear side so that radiation heating may be carried out with efficiency. The thermal conduction from the heater main body 21 raises the temperature of a rear side metal plate 25 and this heat radiating plate 28 respectively so that the heat radiation plate 28 may carry out radiation heating similar to the heater main body 21. This construction makes it possible to increase the radiation areas and reduce the area of the heater main body, thereby enhancing radiation efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heater having a sheet heater.

[0002]

2. Description of the Related Art In recent years, electric heaters have been developed which combine a planar heater, which has the advantages of providing heating over a wide range with low noise and no wind, and a ceramic heater, which enables rapid heating.

Conventionally, a sheet heater attached to this kind of electric heater is, for example, a flat heater body formed by winding a heating wire around a mica substrate so that the heater body is sandwiched from both sides. An insulating plate made of mica or the like is arranged, and the respective metal plates are arranged so as to sandwich the heater main body and the insulating plate from both sides, and further, the heater main body, the insulating plate and the metal plate are fastened with a fastener or the like. It is formed by being tightened. The metal plate of this planar heater is formed in substantially the same shape as the main body of the heater, and the front surface of the metal plate disposed in the front part has a high radiation efficiency and is made of a far infrared ray by painting in order to improve the appearance. A radiation layer is applied.

The sheet heater having such a structure is arranged in the front portion of the electric heater, and far infrared heat is radiated from the sheet heater by energization, and heating is performed by radiant heat.

[0005]

However, in order to radiate more heat and increase heating by using the planar heater having the above-described structure, the planar heater has to be enlarged with the structure as it is. However, if the planar heater is increased in size, the manufacturing cost of the electric heater increases.

[0006] Therefore, there is a problem to increase the radiation efficiency of the planar heater and reduce the manufacturing cost of the electric heater.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric heater having a high radiation efficiency of a planar heater and a low manufacturing cost.

[0008]

The electric heater according to the present invention comprises:
It is provided with a planar sheet heater and a radiator plate having a large thermal conductivity, which is in contact with the sheet heater and extends along the plane direction of the sheet heater.

[0009]

In the electric heater of the present invention, since the heat dissipation plate having a large thermal conductivity is in contact with the planar heater and extends along the planar direction of the planar heater, the heat of the planar heater is planar. In addition to being radiated from the front surface of the heater, the heat transferred from the planar heater to the radiator plate is also radiated from the radiator plate. Therefore, in addition to the area of the planar heater, the area of the heat dissipation plate is also the radiation area, and the radiation efficiency is improved without increasing the area of the planar heater.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric heater according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 11 denotes an electric heater main body, and the electric heater main body 11 has a substantially box shape and is mounted on an upper part of a mounting base 12. And this electric heater body 11 is
A radiation chamber 15 defined by a heat shield plate 14 formed of an air layer for heat insulation is arranged on the front surface of the main body case 13, and the heat shield plate is provided.
A reflection plate 16 for heat reflection is formed on the front side of 14.
Further, a planar sheet heater 17 is arranged in the radiation chamber 15 so that the plane faces the front of the radiation chamber 15.
A mesh guard 18 is attached to the front surface of the. Further, on the upper surface of the main body case 13, an operation section 19 including an operation changeover switch and the like is arranged.

The planar heater 17 arranged in the radiation chamber 15 as described above is constructed as shown in FIG. That is, a flat heater body 21 is formed by winding a heating wire around a substrate made of mica (not shown).
Flat insulating plates 22 and 23 made of mica or the like are sandwiched from both sides, and are attached to the heater body 21 in a laminated manner, and a flat front metal plate 24 and insulating plate 23 are provided on the front surface of the insulating plate 22. Flat rear surface side metal plates 25 are similarly mounted on the rear surface in a laminated manner.
2, 23, the front side metal plate 24 and the rear side metal plate 25 are
The periphery is tightened by a band-shaped tightening tool 26 and laminated and fixed.

Further, the front side metal plate 24 is formed of iron or the like, and flange portions 27 are provided at the upper end and the lower end of the front side metal plate 24 so as to project forward. Further, on the front surface of the front-side metal plate 24, a far-infrared radiation layer is applied by painting in order to enhance the radiation efficiency and make the appearance beautiful.

On the other hand, the rear side metal plate 25 is made of aluminum or the like having a large heat conductivity, and is a heat radiating plate having a substantially wavy section on the upper end face side above the heater body 21. The heat radiation plate portion 28 is integrally extended. Further, a far-infrared radiation layer is applied to the front surface of the heat radiation plate portion 28 by painting in order to improve radiation efficiency like the front side metal plate 24.

A blower motor storage chamber 32 for storing a blower motor 31 is formed at the rear of the heat shield plate 14 of the electric heater body 11, and a casing 33 is provided below the radiation chamber 15 and the blower motor storage chamber 32. And a ventilation path 34 communicating with the blower motor storage chamber 32 is formed. Further, an opening 35 for intake is formed on the rear surface of the main body case 13, and an electrostatic deodorizing filter 36 is arranged in this opening 35. Then, a blower motor 31 is provided at the front of the electrostatic deodorizing filter 36 so as to face the electrostatic deodorizing filter 36 and to have a casing 33.
A fan 37 for blowing air, which is operated by the blower motor 31, is attached to the front part of the blower motor 31. Further, a plurality of ceramic heaters 41 are arranged below the heat shield plate 14 in the ventilation passage 34.
In front of 41, a warm air outlet 43 having a plurality of louvers 42 for changing the blowing direction is formed.

In addition, a fall OFF switch 44 is provided on the base 12.
Is provided, and when the electric heater body 11 falls, its operating protrusion
45 is stretched to stop energizing and prevent a fire.

Next, the operation of the above embodiment will be described.

First, the fan 37 for blowing air sucks in air from the opening 35 in the rear surface of the body case 13, and the dust and odor in the sucked air are collected and deodorized by the electrostatic deodorizing filter 36. , Ceramic heater through air passage 34
The air sent to 41 and supplied to the ceramic heater 41 takes heat from the ceramic heater 41 to reach a high temperature, and is sent out as warm air from the hot air outlet 43 to heat the hot air.

On the other hand, in the planar heater 17, the heater main body 21 generates heat when energized, and the front side of the heater main body 21 is warmed by radiant heat, and is also reflected forward by the reflecting plate 16 in the rear part to efficiently radiatively heat. Further, when the heater body 21 generates heat, the temperature of the rear surface side metal plate 25 rises due to heat conduction, and the temperature of the heat dissipation plate portion 28 of the rear surface side metal plate 25 rises, so that the heat dissipation plate portion 28 also heats. Radiation is performed similarly to the main body 21, and radiant heating is performed together with the heater main body 21.

As described above, the ceramic heater is provided immediately after energization.
By operating 41, warm the warmer in a short time by quick heating,
After that, the planar heater 17 is operated, and heating over a wide range can be obtained with low noise and no wind.

Further, in the planar heater 17, a heat radiating plate portion 28 having a large thermal conductivity is provided on the upper surface of the rear metal plate 25 on the rear metal plate 25.
Since it is extended along the surface direction, the far-infrared heat of the heater body 21 is radiated from the front side metal plate 24, and is also transmitted to the heat radiating plate section 28 through the rear side metal plate 25, so that the heat radiating plate section 28 Also emitted from. Therefore, the area of the front side metal plate 24 and the area of the heat dissipation plate portion 28 become the radiation area, and the radiation efficiency is improved. Further, since the radiation efficiency is increased in this way, the area of the heater main body 21 can be made smaller than that of the conventional planar heater in which the heat dissipation plate portion 28 is not extended in order to obtain the same radiation effect. The cost can be reduced.

Further, since the heat radiating plate portion 28 has a substantially wavy cross section, the surface area can be made larger than that of the flat plate, and the same radiation effect can be obtained. Therefore, the heat radiating plate portion 28 is more compact than that of the flat plate. It can be miniaturized.

Furthermore, since the heat radiating plate portion 28 is thin and has a substantially wavy cross section, it is easy to bend, and the radiation direction can be easily changed by changing the angle of the heat radiating plate portion 28. For example, the heat dissipation plate portion 28 can be easily deformed downward. An appropriate bending adjustment device may be provided around the heat dissipation plate 28 so that the angle of the heat dissipation plate 28 can be adjusted in several steps.

The heat dissipation plate portion 28 is the rear side metal plate.
It may be formed integrally with 25 or may be provided separately.

Alternatively, the heat dissipation plate portion 28 may be extended to the upper end surface of the front side metal plate 24 instead of extending to the upper end surface of the rear side metal plate 25.

Further, without disposing the heat radiating plate portion 28 on the rear side metal plate 25, the lower side of the rear side metal plate 25, or the side portion, that is, to the left and right of the rear side metal plate 25 when viewed from the front side. Alternatively, it may be extended horizontally along the surface direction of the rear metal plate 25.

[0027]

According to the electric heater of the present invention, since the heat dissipation plate having a large thermal conductivity is in contact with the planar heater and extends along the planar direction of the planar heater, In addition to the heat being radiated from the front surface of the planar heater, the heat transmitted from the planar heater is also radiated from the heat dissipation plate. Therefore, in addition to the area of the planar heater, the area of the radiator plate also becomes the radiation area, and the radiation efficiency can be improved without increasing the size of the planar heater.

Further, since the radiation efficiency is increased as described above, the area of the heater main body can be made smaller than that of the conventional sheet heater without extending the heat dissipation plate in order to obtain the same radiation effect. The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electric heater of the present invention.

FIG. 2 is a side view showing an embodiment of a planar heater of the electric heater.

[Explanation of symbols]

 11 Electric heater body 17 Planar heater 28 Radiator plate as a radiator plate

Claims (1)

[Claims] 1. A planar sheet heater, and a radiator plate having a large thermal conductivity, which is in contact with the sheet heater and extends along the surface direction of the sheet heater. Electric heater to be.