JPH10311603A - Heat storage electric heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage electric heater, storing heat employing iron oxide based heat storage bricks, having a big heat capacity, to use midnight electric power. SOLUTION: Iron oxide base heat storage bricks 14, having irregularities 14a, are arranged in a casing 1 and the circumference of the bricks are insulated by a heat insulating material 3 while a sheath heater 9 is contacted with the iron oxide based heat storage bricks 14 to store heat. A plurality of slits 4a-4d, which are penetrated through an inner upper plate 2c, an upper heat insulating material, an inner bottom plate 2d and a lower heat insulating material, which are arranged on the upper and lower surfaces of the iron oxide based heat storage bricks 14, are bored to communicate with a front gap while the slits 4b, bored on the inner upper plate 2c, are provided so as to be opened and closed freely by a damper 5, covered by a heat insulating material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative electric heater, and more particularly, to an electric heater for storing electric power which is supplied to a sheathed heater at night and stores the heat in an iron oxide-based regenerative brick having a large heat capacity. A heat storage electric heater that effectively saves the stored heat storage with thermal insulation covering the system heat storage brick, radiates the stored heat into the room by natural convection by opening and closing the damper as needed, and uses it for indoor heating without a fan It is.

[0002]

2. Description of the Related Art In a conventional heat storage electric heater, a general brick is brought into contact with a sheath heater to store heat.

[0003]

However, conventional bricks have a problem that the heat capacity of nighttime electric power cannot be sufficiently and efficiently used because of a small heat capacity.

The present invention uses an iron oxide heat storage brick having a large heat capacity, coats the iron oxide heat storage brick with a heat insulating material to effectively store heat, and controls natural convection by opening and closing a damper as required. By dissipating heat indoors,
An object of the present invention is to provide a heat storage electric heater aimed at solving the above-mentioned conventional problems.

[0005]

Means for Solving the Problems A regenerative electric heater of the present invention comprises a sheath heater as a heating source in a casing;
An iron oxide-based heat storage brick that stores heat by contacting the back surface with the sheathed heater is provided, and a gap is provided on the front and back surfaces of the iron oxide-based heat storage brick, and the four circumferences are covered with a heat insulating material.
An inner top plate disposed on the upper and lower surfaces of the iron oxide-based heat storage brick, an upper heat insulating material and an inner bottom plate, and a plurality of slits penetrating the lower heat insulating material so as to communicate with the gap on the front surface, and heat insulation. A damper covered with a material is installed so as to adjust the opening and closing of the slit formed in the internal upper surface plate and the amount of air supply, and further comprises a heat storage completion controller and an overheat prevention device in the casing. The above problem was solved by adopting the method.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a heat storage electric heater of the present invention, FIG. 2 is a front view with a front cover removed, and FIG. 3 is a plan view of the same, in which 1 is a casing made of a steel plate, and the casing 1 is a base 1 having an L-shaped cross section.
a and a front cover 1b having an inverted L-shaped cross section and left and right side covers 1c and 1d, respectively. Inside side walls 2a and 2b made of a steel plate are erected on the left and right inside the casing 1, and a plurality of slits 4a and 4b made of a steel plate are provided between the inside side partition plates 2a and 2b. Are fixed in parallel with each other.

In the figure, reference numeral 3 denotes a heat insulating material, and slits 4 formed in the inner upper surface plate 2c and the inner lower surface plate 2d are formed on the lower surface of the inner upper surface plate 2c and the upper surface of the inner lower surface plate 2d.
An upper heat insulating material 3a and a lower heat insulating material 3b each made of a calcium silicide block in which slits 4c and 4d communicating with a and 4b are respectively fixed, and an inner side partition between the inner upper plate 2c and the inner bottom plate 2d. Board 2
External side heat insulators 3c and 3d made of glass wool and internal side heat insulators 3e and 3f made of ceramic fiber are fixed to the inner surfaces of a and 2b, respectively.

A damper 5 covered with a heat insulating material made of silicon foam is provided above the inner upper surface plate 2c, and a shaft 5a of the damper 5 is positioned near upper portions of the inner side partition plates 2a and 2b. The upper end of the slit 4a is opened and closed by opening and closing the slit 4a by rotating the damper 5 as needed by pivotally supporting the damper shaft 5a and connecting one end of the damper shaft 5a to start / stop heat radiation. And the amount of heat radiation can be controlled by changing the opening angle. Further, a heat storage completion controller 7 made of bimetal is provided above the internal upper surface plate 2c, and when the heat storage temperature set by the heat storage completion controller 7 is reached, the heat storage circuit is cut off.

Further, an overheating prevention device 8 made of bimetal is provided on the upper portion of the inner upper plate 2c. For example, when the heat storage temperature becomes 150 ° C. or more and there is a possibility of overheating, the overheating prevention device 8 is provided. The heat storage circuit is cut off by the prevention device 8 to prevent damage due to overheating of the device. A sheath heater 9 for heating is provided between the inner side partition plates 2a and 2b in the casing 1 between the inner side partition plates 2a and 2b.
It is provided to be supported by.

On the outside of the inner side partition plate 2b, a damper motor 6 for driving the damper 5, a transformer 11 for converting a commercial power supply to a low voltage as a power supply for the damper motor 6, and a drive for the damper motor 6 are provided. A damper relay 12 to be controlled and a power supply terminal block 13 for wiring and connecting the power supply and the electric equipment are mounted.

A plurality of iron oxide-based heat storage bricks 14 are housed in a space surrounded by the upper heat insulating material 3a, the lower heat insulating material 3b, and the inner side heat insulating materials 3e and 3f in the casing 1, and the oxidizing agent is provided. The front surface of the iron-based heat storage brick 14 is provided with a gap 15 so that the slits 4a to 4d can be vertically penetrated by the internal front main heat insulating material 3g made of microtherm.
a, and the back surface of the iron oxide thermal storage brick 14 is covered with an inner back main heat insulating material 3h made of microtherm with a gap 15b of the width of the sheathed heater 9, and further covered with the inner front surface. An outer front heat insulator 3i and an outer rear heat insulator 3j made of glass wool are provided on the outer surfaces of the main heat insulator 3g and the inner rear main heat insulator 3h, respectively.

Since the iron oxide heat storage brick 14 has a larger heat capacity than conventional bricks, it has a large heat storage effect. Then, the iron oxide-based heat storage brick 14
Has formed a number of serrated irregularities 14a on its front surface,
In addition, the rear surface is arranged so that a middle position thereof is in contact with the sheathed heater 9. The irregularities 14a are for increasing the surface area of the front surface of the iron oxide-based heat storage brick 14 to increase the efficiency of heat exchange when warming the air near the irregularities 14a.

On the front face of the damper 5 of the front cover 1b having an inverted L-shaped cross section, a hot air blowing grill 1c is provided.
However, a suction grill 1d is provided near the lower part of the front surface, and the side covers 1c and 1d cover the damper motor 6, the transformer 11, the damper relay 12, the power supply terminal block 13 and the like from the outside to form the casing 1. I do.

FIG. 4 is a longitudinal sectional view of the regenerative electric heater of the present invention, showing the internal structure from the right side. The casing 1 includes a base 1a having an L-shaped cross section and a front cover 1b having an inverted L-shaped cross section.
A blow grill 1c is formed at the upper part of the front surface of b, and a suction grill 1d is formed at the lower part. Both ends of the inner bottom plate 2d are attached to the base 1a and the front cover 1b, and the center is supported by the bottom support 2e.

The iron oxide thermal storage brick 14 is covered on the upper and lower sides with an upper heat insulating material 3a and a lower heat insulating material 3b, and has gaps 15a and 15b before and after the inner front main heat insulating material 3g.
And an inner rear main heat insulator 3h, and an outer front heat insulator 3i and an outer rear heat insulator 3j are disposed on outer surfaces of the inner front main heat insulator 3g and the inner rear main heat insulator 3h. The reason why the gap 15a is provided in the vicinity of the uneven portion 14a and the inner front main heat insulating material 3g is to efficiently convect the heat of the iron oxide-based heat storage brick 14 upward. The reason why the gap 15b is provided between the rear surface of the inner back main insulating material 3h and the inner rear main heat insulating material 3h is not only that the heat of the sheath heater 9 is directly transmitted to the iron oxide-based heat storage brick 14 as conduction heat, but also that the gap 15b is provided. The iron oxide-based heat storage brick 14 is heated using radiant heat, and the gap 1 is further heated.
This is because the iron oxide-based heat storage brick 14 is efficiently heated from the entire back surface using the hot air of 5b.

FIG. 5 is a circuit diagram showing a heat storage circuit section. The sheath heater 9, an overheat prevention device 8 made of bimetal, and a heat storage completion controller 7 made of bimetal constitute a series circuit. Since it is connected to the power supply, the series circuit is disconnected even when the heat storage is completed or when the temperature is too high, so that the sheathed heater 9 is not heated in any case.

FIG. 6 is a circuit diagram showing a heat radiating circuit section. A transformer 11 converts a commercial power supply to a low voltage to operate the damper motor 6, and the damper motor 6 and the damper relay 12 are connected in series. By controlling the damper relay 12 with a thermostat 16, the rotation direction of the damper motor 6 is switched, and the opening / closing operation of the damper 5 is controlled.

Thus, the iron oxide heat storage brick 14
When the temperature rises to a preset heat storage temperature and heat storage is completed, the heat storage completion controller 7 made of bimetal disconnects the heating circuit, so that the sheath heater 9 is not heated any more. In the event that the iron oxide heat storage brick 14 is heated to a temperature higher than a preset temperature for some reason, the temperature rise prevention device 8 made of bimetal is activated to activate the heating circuit. Is cut off and the sheath heater 9 is no longer heated, so that safety can be ensured.

Outside the inner front main heat insulating material 3g and the inner rear main heat insulating material 3h before and after the iron oxide-based heat storage brick 14, an outer front heat insulating material 3i and an outer rear heat insulating material 3j are further provided.
Are provided in the casing 1 to more strictly prevent heat storage from unnecessarily flowing out of the casing 1 around the outside. A damper 5 is provided on the slit 4a of the inner upper surface plate 2c in the casing 1, and the damper 5 includes a damper shaft 5a and inner side partition plates 2a and 2a.
b is rotatably supported, connected to the damper motor 6, and driven to open and close the upper part of the slit 4a.

The slit 4 is formed by a damper 5.
is closed, and the sheath heater 9 is heated by an external current supply, the heat is stored in the iron oxide-based heat storage brick 14, and the stored heat is transferred to the heat insulating material 3 by the entire iron oxide-based heat storage brick 14. And since the damper 5 closes the slit 4a, the heat is kept without being dissipated. The heat is stored in the surroundings, particularly the uneven portions 14 having a large surface area.
The air in the gap near a is efficiently heated. The warmed air has a lower specific gravity, and the iron oxide-based heat storage brick 1
The gap 15a between the vicinity of the uneven portion 14a of FIG. The rising air is the upper insulation material 3a.
The slits 4a and 4c for communicating the internal upper plate 2c with the slits 4a and 4c
Try to go up through. However, since the slit 4c is closed by the damper 5 covered with a heat insulating material made of silicon foam, the casing 1
The heat is not radiated to the outside, and the heat is further stored in the iron oxide-based heat storage brick 14.

At the time of heating the room, when the damper 5 which has been closing the slit 4a is opened by driving the damper motor 6, the light and warm air passing through the slits 4c and 4a is removed by the casing. The air is blown out from the blowout grill 1c at the upper portion of the front surface 1 and is discharged indoors. The blowing amount is controlled by the degree of opening of the damper 5. On the other hand, when the air near the uneven portion 14a of the iron oxide-based thermal storage brick 14 is efficiently heated by the uneven portion 14a and rises and is discharged indoors, the gap 15a near the uneven portion 14a becomes negative pressure, The negative pressure sucks air from the suction grill 1d on the lower front surface, and replenishes the air with the negative pressure near the uneven portion 14a. When the replenished air is heated by the iron oxide regenerative brick 14 to cause convection of the air, warm air can be continuously sent into the room without using a fan. Since the heat storage electric heater of the present invention employs the iron oxide heat storage brick 14, the heat capacity is large, and the duration of heating by convection can be extended.

When the regenerative electric heater of the present invention is installed near a window of a building and constantly emits upward warm air, a stable air curtain effect prevents cold drafts (cold air) from the outside and heats the room. And the temperature distribution in the room can be made uniform. In addition, since heat can be stored using inexpensive nighttime power, the overall running cost can be reduced. Further, the present invention provides an iron oxide heat storage brick 14 having a large heat capacity by energizing and heating the sheath heater 9 on the basis of inexpensive nighttime power.
The iron oxide-based thermal storage brick 1 is mainly configured by electrically storing and storing heat and electrically opening and closing the damper according to the presence or absence of a heating request.
The control unit controls the heat radiation of natural heat convection of the heat storage of No. 4, and can perform additional cooking during the day if necessary.

[0023]

The regenerative electric heater according to the present invention is embodied in the form described above, and has the following effects. Since iron oxide heat storage bricks were used for heat storage,
It has a large heat capacity and can stably release its heat for a long time. Since the iron oxide-based heat storage brick has an uneven portion on the front surface, the surface area is large, and heat exchange for producing warm air for heating is efficiently performed. Since the heat storage completion controller made of bimetal is provided, the heating circuit can be automatically cut off when the heat storage is completed. Further, since the overheating prevention device made of a bimetal is provided, the heating circuit is automatically cut off when the temperature is overheating, thereby ensuring safety.
Furthermore, by installing the regenerative electric heater of the present invention in the perimeter zone (air conditioning) near the window of a building, it is possible to prevent cold draft (cold air) and reduce the load of indoor heating by a stable air curtain effect. In addition, the temperature distribution in the room can be made uniform. Further, since inexpensive nighttime power is used, there is an effect that the overall running cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a heat storage electric heater according to the present invention.

FIG. 2 is a front view of the heat storage electric heater of the present invention with a front cover removed.

FIG. 3 is a plan view of the heat storage electric heater of the present invention with a front cover removed.

FIG. 4 is a longitudinal sectional view of the heat storage electric heater according to the present invention.

FIG. 5 is an explanatory diagram of a heat storage circuit of the heat storage electric heater according to the present invention.

FIG. 6 is an explanatory diagram of a heat dissipation circuit of the heat storage electric heater according to the present invention.

[Explanation of symbols]

Reference Signs List 1 casing, 2c internal top plate, 2d internal bottom plate, 3 heat insulating material (3a to 3g), 4a to 4d slit, 5 damper, 7 heat storage completion controller, 8
Overheat prevention device, 9 sheathed heater, 14
Iron oxide thermal storage brick, 15a / 15b gap.

Claims (2)

[Claims] 1. A sheath heater, which is a heating source, and an iron oxide-based heat storage brick that stores heat by contacting a back surface of the sheath heater in a casing, and a gap is provided between a front surface and a back surface of the iron oxide-based heat storage brick. In addition to covering the four circumferences with a heat insulating material, a plurality of slits penetrating the inner top plate, the upper heat insulating material and the inner bottom plate, and the lower heat insulating material provided on the upper and lower surfaces of the iron oxide-based heat storage brick are provided. And a damper covered with a heat insulating material is installed so that a slit formed in the inner upper surface plate can be opened and closed and the amount of supplied air can be adjusted, and heat storage is completed in the casing. A heat storage electric heater comprising a controller and an overheat prevention device. 2. The heat storage electric heater according to claim 1, wherein the iron oxide heat storage brick has an uneven portion on a front surface.