JPH05280758A - Electrical panel heater - Google Patents

Abstract

PURPOSE:To manufacture electrical panel heater at low costs, reduce the danger of being burned and improve its effectiveness in heating the inside of a room by avoiding an expensive flocking of a guard to hinder its heating by the heat flow from the heater. CONSTITUTION:A heat flow guide 7 made of a high heat resisting synthetic resin smaller in heat transfer quantity per time than metal material is provided at the front upper part of a heater case 1, the upper end of a guard 5 is supported by the front plate 7a of the heat flow guide 7 and an opening 7e is formed behind the front plate 7a in order for the exhaust heat from a heating element 2 to be discharged therethrough, thereby reducing the danger of being burned caused by the metal material heated by the exhaust heat as in the conventional case, and the heat flow guide can be made of the resin material inexpensively as compared with the flocked metal material. Also, the opening 7e is provided with a current plate to increase the velocity of the upward stream of the exhaust heat and the convective heat transfer in a room so as to enhance the, heating effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric panel heater having a planar radiant heating element.

[0002]

2. Description of the Related Art In recent years, electric heaters have a planar radiator that does not burn even when touched by paper, dust, etc. Panel heaters are used.

Conventionally, this type of electric panel heater is shown in FIG.
The structure shown in FIG. That is, the planar heating element 102 is housed in the main body case 101 having an open front surface, and the surface temperature is set to 100 to 300 ° C., and the radiant heat is radiated to the warmer in front. Further, the heating element 102 is coated on its surface in order to enhance the radiation characteristic of far infrared rays to enhance the radiation effect. Heating element 102
A guard 103 is provided in front of the main body case 101 so as to cover the opening of the main body case 101, so that the heating element 102 cannot be directly touched by fingers. The guard 103 is generally made of a metal material in order to secure strength and heat resistance.

In the above structure, by energizing the heating element 102, the warmer receives gentle radiant heat from the heating element 102 and the air around the heating element 102 is heated to generate an ascending air current. Due to the indoor convection effect, the temperature of the entire room gradually increased.

[0005]

In such a conventional electric panel heater, since the heating element 102 is a sheet-shaped radiator, the front surface of the guard 103 does not become so hot, but the surface of the heating element 102 is exposed. The high-temperature ascending air current generated by the heat transfer to the air heats the upper end portion 103a of the guard 103 when passing through the upper end portion of the opening of the main body case 101, and the warmer does not care about this high temperature metal portion. There was a problem that there is a risk of burns when touching. In addition, in order to eliminate the occurrence of this burn, guard 1
The metal surface of No. 03 may be flocked, but there is a problem that the manufacturing cost becomes high.

Further, in this electric panel heater, the radiant heat from the heating element 102 is radiated to the warmer, but the updraft heated around the heating element 102 is not effectively utilized and the updraft is generated. Since it stays near the upper part of the main body case 101, there is a problem that it takes time until the entire room becomes warm.

The present invention solves the above problems by reducing local heating of the main body case or the like due to high temperature rising air flow as much as possible, reducing the risk of burns even if touched by fingers, and suppressing manufacturing costs. The first object is to provide an electric panel heater.

A second object of the present invention is to provide an electric panel heater capable of smoothly flowing an ascending air current from a heating element and enhancing convection to improve the heating effect of a room.

[0009]

The first means for achieving the first object of the present invention is to provide a heating element provided on the front surface of the main body case and a metal guard arranged in front of the heating element. And a front plate portion that supports the upper end portion of the guard, and an opening that vertically penetrates behind the front plate portion, and the front plate portion is formed of a heat-radiating synthetic resin. ..

A second means for achieving the second object is to provide a heat flow derivative formed of a heat resistant synthetic resin on the upper front surface of the main body case, and the heat flow derivative is a front plate portion provided at the front. The structure is provided with an opening provided behind the front plate and at least one rectifying plate installed so as to divide the opening into small parts.

[0011]

According to the present invention, the structure of the first means described above
The upward airflow generated from the heating element passes through the opening provided in the upper part of the guard and is discharged from the main body, but the upper part of the guard is made of a heat-resistant synthetic resin material, and the heat transfer amount is higher than that of metal. Since it is extremely small, it is possible to reduce the thermal adverse effect on the skin when the human body comes into contact with it.

Further, according to the structure of the second means, the opening of the heat flow guide is divided into small squares by the straightening vane,
The upward airflow from the heating element does not diffuse, but the speed of the upward airflow can be increased, the convection effect of the room can be increased, and the rising speed of room temperature can be increased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, a sheet-like heating element 2 having a coating that enhances radiation characteristics of far infrared rays is installed on the opening surface of the main body case 1 having a substantially box-shaped front opening. A heater wire 2 a is provided inside the heating element 2.
Is embedded. A heat insulating plate 3 for preventing rearward radiation is disposed between the heating element 2 and the main body case 1 to prevent the rear surface of the main body case 1 from being heated. Heating element 2
Are supported by the heat insulating legs 4 and fixed with a gap from the heat insulating plate 3. A guard 5 made of a wire is attached to the front surface of the main body case 1 and to the front of the heating element 2.
The guard 5 is appropriately set with its coarseness and the distance from the heating element 2 so that the fingers do not directly touch the heating element 2. The heat insulating plate 3 has an inclined side 6 formed above it,
An upward airflow generated by heat radiation to the front and rear of the heating element 2 is guided above the front surface of the main body case 1. A heat flow guide 7 made of high heat resistant synthetic resin is integrally formed on the upper part of the main body case 1. The heat flow guide 7 supports the upper end of the guard 5 and stands upright, a rear plate 7b standing upright substantially parallel to the front plate 7a, and a rear plate 7b extending rearward from the lower end thereof. And a hypotenuse portion 7c which is connected to the back surface 1a of the main body case 1. Further, the heat flow guide 7 has an opening 7e surrounded by the front plate portion 7a, the rear plate portion 7b and the side plate portions 7d on both sides. A control device 8 is housed in the upper part of the main body case 1, and a control switch 8a is provided on the top plate 1b.
At the bottom of the body case 1, there is a stand 9 that supports this body.
Is attached.

In the above structure, when the control switch 8a is operated to energize the heating element 2, the surface temperature of the heating element is about 1.
It is heated to about 00 to 400 ° C., a low energy amount of radiation occurs from the far-infrared radiation processed surface on the front surface, and the warmer can obtain gentle radiant heat. On the other hand, on the front surface and the back surface of the heating element 2, direct heat conduction to air occurs, and this heated air becomes an ascending airflow of about 100 ° C. and is guided to the heat flow derivative 7 along the inclined side 6. It Further, the ascending airflow passes through the opening 7e from the hypotenuse 7c of the heat flow guide 7 and is discharged above the main body 1. At this time, the high-temperature ascending airflow of 80 ° C. or higher is the heat flow derivative 7
The front plate portion 7a is heated to have a surface temperature of about 70 ° C. or higher, but as shown in FIG. 2, the front plate portion 7a made of synthetic resin has a heat transfer amount per unit time that is higher than that of a metal material. It is extremely small, and if it is touched for a short time, the possibility of burns on fingers and the like is reduced.

As described above, according to the air panel heater of the first embodiment of the present invention, since the high heat resistant synthetic resin is arranged in the passage of the ascending air current generated from the heating element, the resin is higher than the high temperature heating portion of the metal piece. Since the heat capacity of the material is small, it is possible to reduce the risk of burns even if the heating part is touched. In addition, an increase in manufacturing cost can be suppressed as compared with the flocking process on the guard surface.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those described in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. As shown in the figure, heat flow derivative 7
When a plurality of flow straightening plates 7f are installed between the front plate portion 7a and the rear plate portion 7b of the above, and the heat flow guide 7 is viewed from the upper surface, the openings 7e have a large number of squares by the flow straightening plate 7f as shown in FIG. The ventilation hole 7g is formed.

With the above-described structure, the ascending air current generated around the heating element 2 is moved along the inclined side 6 of the heat insulating plate 3 into the heat flow induction member 7.
When the air flows through the ventilation holes 7g formed in the heat flow guide 7, the flow is rectified without being diffused, and the air is discharged upward while increasing the ascending air velocity, thereby increasing the function of convection in the guide. Thus, the room temperature can be raised in a relatively short time.

Thus, according to the second embodiment of the present invention,
By guiding the ascending airflow, which was conventionally treated as exhaust heat, to the ventilation holes formed in a grid shape of the heat flow derivative, it is possible to accelerate the ascending speed and further increase the convection effect to enhance the indoor temperature increasing effect. ..

[0019]

As is apparent from the above embodiments, according to the present invention, a heat flow guide made of a highly heat-resistant synthetic resin is formed on the upper part of the front surface of the main body, and the end face of the guard of the metal wire is a front plate of the heat flow guide. By being locked to the portion, it is possible to provide an electric panel heater which is effective in reducing the risk of burns caused by local heating of the metal guard due to an upward air flow and further suppressing an increase in manufacturing cost. In addition, by providing a grid-like ventilation hole in the heat flow derivative and rectifying the rising airflow without diffusing it, the electric airflow has an effect of accelerating the speed of the airflow and increasing the convection effect to enhance the heating effect in the room. A heater can be provided.

[Brief description of drawings]

FIG. 1 is a side sectional view of an electric panel heater according to first and second embodiments of the present invention.

FIG. 2 is a material characteristic diagram of the heat flow derivative of the first embodiment.

FIG. 3 is a plan view of the same second embodiment.

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

[Explanation of symbols]

 1 Main Body Case 2 Heating Element 5 Guard 7 Heat Flow Derivative 7a Front Plate 7e Opening 7f Rectifier Plate

Claims (2)

[Claims] 1. A heating element provided on a front surface of a main body case, a metal guard installed in front of the heating element, a front plate portion for supporting an upper end portion of the guard, and an upper and lower part behind the front plate portion. An electric panel heater having an opening penetrating into the front panel, the front panel being formed of a heat resistant synthetic resin. 2. A heat flow guide formed of heat-resistant synthetic resin is provided on the upper front surface of the main body case, and the heat flow guide has a front plate provided at the front and an opening provided behind the front plate.
The electric panel heater according to claim 1, further comprising at least one rectifying plate that is installed so as to divide the opening into small parts.