JP3063246B2 - Panel heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel heater for heating by radiant heat.

[0002]

2. Description of the Related Art A conventional panel heater of this type has a configuration as shown in FIGS.

As shown in FIG. 4, a planar heater 2 is provided upright over substantially the entire width of a main body 1 provided with a heat radiation hole 1a on the front surface. Behind the planar heater 2, a heat shield plate 4 that forms an air flow path 3 with the back surface 1 b of the main body 1.
Are arranged. The upper edge 4 a of the heat shield plate 4 is inclined upward and is in contact with the front surface of the main body 1. Upper edge 4 of heat shield plate 4
The upper part of a is covered with a partition plate 5 and guides the air flow path 3 to the front surface of the main body 1. Reference numeral 7 denotes an intake port of the air flow path 3 provided at a lower portion of the back surface of the main body 1, 8 denotes an exhaust port of the air flow path 3 provided at an upper portion of the front surface of the main body 1, and 9 denotes a front side of the heat radiation hole 1a. The guard 10 is a pedestal.

As shown in FIG. 5, the planar heater 4 has an upper heater 42 and a lower heater 43 in which a heating wire 41 is vertically wound around an insulating plate, and an upper heater 42 and a lower heater 43 on both sides. Plate 44 that insulates the upper and lower heaters 43 from each other.
A pressing plate 46 for pressing the upper heater 42 and the lower heater 43 against the heat radiating plate 45;
And heating wire lead-out portions 47 and 48 each formed of an insulating tube for connecting a heating wire 41 derived from each of the above to a lead wire (not shown).

In the above configuration, when the planar heater 2 is energized, the heating wire 41 generates heat, heats the heat radiating plate 45 to start radiating heat, and the first hot air flow A flows around the planar heater 2. Then, heat radiation to the rear of the planar heater 2 occurs. The heat shield plate 4 against the first hot air flow A and heat radiation
Guides the first hot air flow A to the upper portion of the heat radiating hole 1a of the main body 1 and shuts off heat radiation upward and backward of the planar heater 2. As a result, the temperature of the heat shield plate 6 also increases, so that the second hot air flow B is generated in the air flow path 3. Since the second hot air flow B is sucked in from the intake port 7 and exhausted from the exhaust port 8, the temperature of the outer surface of the main body 1 other than the front surface can be kept low.

[0006]

In such a conventional panel heater, an upper heater 42 and a lower heater 43 are equally divided in order to reduce the extension of the heating wire 41 due to heat expansion. Further, the heating wire 41 is wound around an insulating plate so as to generate heat evenly over the entire surface of the planar heater 2 even when the power is switched, and its leading portions are provided on the respective insulating plates. 48.

For this reason, as shown in FIG.
The second heating wire lead-out portion 48 is located above the lower heater 43, and is heated to a high temperature by the first hot air flow A and the heat radiation of the planar heater 2. There has been a problem that the heat resistance of the object and the like and the connection between the heating wire 41 and the lead wire are exposed to high temperatures.

On the other hand, in order to avoid a high temperature at the connection between the heating wire 41 and the lead wire, the connection is positioned in the low-temperature air passage 3 through the heat shield plate 4. However, the hot air leaking from the through-hole of the heat shield plate 4 and the hot air flow in the air flow path 3 whose temperature becomes higher toward the upper portion have a high temperature at the connection portion, and the heat resistance has been a problem.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a panel heater excellent in durability and reliability capable of lowering a temperature of a connecting portion between a heating wire and a lead wire.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a main body having a heat radiating hole on a front surface thereof, a planar heater provided in the main body, and a rear side of the planar heater. A heat shield plate that forms an air flow path with the back surface of the main body, an air intake port of the air flow passage provided at a lower rear portion of the main body, and a top surface upper portion of the main body. And an exhaust port of the air flow path, and a heating wire lead-out portion of the planar heater is led out to a lower portion in the air flow path.

[0011]

As described above, according to the present invention, a heating wire lead-out portion of a planar heater is provided at a lower portion in an air flow path formed between a heat shield plate provided behind a planar heater and a back surface of a main body. , The heating wire lead-out portion does not receive the heat radiation of the sheet heater, and is cooled by the airflow sucked into the air flow path. The temperature of the connection can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The same parts as those shown in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. A heat shield plate 4 that forms an air flow path 3 between the sheet heater 2 and the rear surface 1b of the main body 1 is provided. A lower part of the heat shield plate 4 is penetrated to a lower part of the air flow path 3. A hole 11 is provided. Then, the heating wire lead-out part 47 of the planar heater 2 is led out from the penetrating part 11 to a lower part in the air flow path 3.

As shown in FIGS. 2 and 3, the planar heater 2 has a heating wire 41 wound vertically around an upper heater 42 and a lower heater 43, respectively. It is configured to be connected to a lead wire via the lead-out section 47.

In the above configuration, when the planar heater 2 is energized, the heating wire 41 generates heat and heat radiation is started in the same manner as in the prior art, and the first hot air flow A and the second hot air flow B occurs.

In this operation, the heating wire lead-out portion 47 is led out from the penetrating portion 11 of the heat shield plate 4 to the lower part in the air flow path 3. It is not cooled, and is cooled by the airflow sucked from the intake port 7 by the second hot airflow B, whereby the connection between the heating wire 41 and the lead wire is maintained at a low temperature.

As described above, according to the panel heater of the embodiment of the present invention, since the heating wire lead-out portion 47 of the planar heater 2 is led out to the lower portion in the air flow path 3, the heating wire lead-out portion 47 is provided.
And the connection between the heating wire 41 and the lead wire does not receive heat radiation from the planar heater 2 or heating of the first hot air flow A,
In addition, the air is cooled by the second airflow B and the temperature thereof can be lowered, so that there is an effect that durability and reliability can be improved.

[0018]

As is clear from the above description of the embodiment,
According to the present invention, the heating wire lead-out portion of the sheet heater is led out to a lower portion in an air flow path formed between the heat shield plate disposed behind the sheet heater and the back surface of the main body. As a result, the heating wire lead-out portion does not receive the heat radiation of the planar heater and is cooled by the airflow sucked into the air flow path, so that the temperature of the connection portion between the heating wire and the lead wire is reduced. It can be lowered, and its deterioration can be prevented.

As described above, according to the present invention, a panel heater excellent in durability and reliability can be provided.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a panel heater according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the planar heater.

FIG. 3 is a front view of a main part of the planar heater.

FIG. 4 is a side sectional view of a conventional panel heater.

FIG. 5 is an exploded perspective view of the same surface heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Planar heater 3 Air flow path 4 Heat shield plate 7 Intake port 8 Exhaust port 47 Heating wire lead-out part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-203126 (JP, A) Japanese Utility Model Showa 61-71813 (JP, U) Japanese Utility Model Showa 47-11151 (JP, U) Japanese Utility Model Showa 63- 22513 (JP, U) Actually open sho 59-103105 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24D 13/02

Claims (1)

(57) [Claims] 1. A main body having a heat radiation hole on a front surface thereof, a planar heater standing inside the main body, and an air flow disposed between the planar heater and a rear surface of the main body. A heat shield plate that forms a path, an air inlet of the air flow channel provided at a lower rear portion of the main body, and an air outlet of the air flow channel provided at an upper front portion of the main body; A panel heater in which a heating wire lead-out portion of the heater is led to a lower portion in the air flow path.