JP3146456U - Heater unit for electric kotatsu - Google Patents

Abstract

To improve the thermal efficiency of an electric kotatsu by making it possible to effectively use the heater heat of the electric kotatsu without escaping to the futon and the top plate placed on the futon and consuming it wastefully.
A heater mounting plate 25 having a heater 5 attached to a lower surface thereof, a unit cover 27 having air permeability disposed in a manner covering the heater 5 below the heater mounting plate 25, and a heater mounting plate 25. And the fan 4 for sending the air in the ventilation path 31 of the heater mounting plate 25 to the lower space through the ventilation hole 30. It is connected to the air inlet 9 communicating with the side space of the plate 25.
[Selection] Figure 1

Description

The present invention relates to a heater unit for an electric kotatsu with improved thermal efficiency.

Conventionally, an electric kotatsu has been used by placing a top plate on a futon that covers a tower equipped with a heater unit, so that the heat of the heater does not scorch the futon etc. Is arranged.

However, in practice, considerable heater heat is transmitted to the futon and the top plate placed on it. A possible reason for this is the lack of function of the reflector and the heat insulating material of the heater.

That is, even if the reflector and the heat insulating material have good performance, they cannot store or heat-insulate all of the heat of the heater and store heat to some extent.

Therefore, the reflector of the heater is heated, and the heat reaches the loose insulation located above the reflector and is absorbed by the futon and the top plate, so that it does not contribute to the heating inside the kotatsu. The thermal efficiency of this electric kotatsu is never good.

On the other hand, there is known a structure as shown in FIG. 5 in which a fan for circulating the air in the kotatsu is attached to increase the thermal efficiency of the electric kotatsu (Patent Document 1).

In this device, the heater unit H is attached to a unit attachment frame (not shown) provided on the lower surface of the tower. The heater unit H includes a heat insulating material 10 that covers the upper surface of the reflecting plate 2 and heaters 5 and 5 provided below the reflecting plate 2, and is heated by a disk-shaped fan 4 that is driven to rotate by the motor 3. Heat is circulated in the kotatsu.

Furthermore, as shown in FIG. 6, a technique in which the top plates 8a and 8b are doubled is disclosed as a measure for alleviating the heater heat that escapes upward from the reflector of the heater. In this structure, a tower 20 having legs 21 attached to the lower parts of the four corners of the lower top plate 8b (formed in a simple flat plate shape rather than a lattice shape), a heater unit H attached to the tower 20 and the lower top plate. The upper top plate 8a is provided with a detachable attachment 22 above 8b. When used as an electric kotatsu, a futon is hung on the lower top plate 8b, and the upper top plate 8a from which the attachment 22 is removed is placed above the futon. In this case, since the lower top plate 8b is formed in a simple flat plate shape instead of a lattice shape, the heater heat from the heater unit H is efficiently cut off by the simple flat plate lower top plate 8b, and the futon is directly removed. Do not warm. Accordingly, the heater heat is not easily transmitted to the futon and the upper top plate 8a mounted thereon, and the amount released to the atmosphere is suppressed, so that the thermal efficiency of the electric kotatsu is improved (Patent Document 2).

JP-A-8-54147 (4th page, FIG. 1) Japanese Patent Application Laid-Open No. 6-241459 (page 3, FIG. 1)

In Patent Document 1, a heater heat circulation fan 4 is provided in the heater unit H, but this fan 4 causes air circulation only in a space below the reflector 2. Since the heater heat that escapes above 2 is not returned to the lower space in the kotatsu, the heater heat reaches the futon and the top plate as in the prior art, and the thermal efficiency of the electric kotatsu is reduced accordingly.

On the other hand, since the thing of patent document 2 requires the upper top plate 8a different from the lower top plate 8b, the attachments 22 and 22 interposed between these both, the number of parts increases and it causes high cost. To do.

The present invention has been made to solve the above-mentioned problems, and the heater heat of the electric kotatsu escapes to the futon and the top plate placed thereon and can be used effectively without being wasted. Thus, an object is to improve the thermal efficiency of the electric kotatsu.

[Convention of Claim 1]
The means for solving the problems according to claim 1 for solving the above-mentioned problems are as follows:
“A heater mounting plate with a heater attached to the bottom surface,
A vent hole formed in the heater mounting plate;
A fan for sending air in a ventilation path formed between the heater mounting plate and a plate body thereabove to the lower space through the ventilation holes;
A heater unit for electric kotatsu, comprising a unit cover having air permeability arranged in a manner to cover the heater and the fan below the heater mounting plate,
It is provided on the side surface of the heater unit or in the vicinity of the outer periphery of the heater mounting plate and has an intake port for sucking air in a side space of the heater unit.
In this case, when the fan rotates during the use of the kotatsu, the air in the side space of the heater unit is sucked from the side surface of the heater unit or the intake port opened near the outer periphery of the heater mounting plate. Therefore, according to the above solution, the heated air released downward from the heater is not sucked into the intake port. Then, the air sucked into the intake port flows through a ventilation path formed between the heater mounting plate and a plate body thereabove by the action of the fan, and is sent out to the lower space from the ventilation hole.
As is clear from the above description, according to the above solution, the staying heat in the air passage formed between the heater mounting plate heated by the heater and the plate body thereabove is caused by the rotation of the fan. It is sent to the space below from the vent hole formed in the heater mounting plate, whereby the staying heat is effectively utilized and the thermal efficiency of the electric kotatsu is improved.

[A device according to claim 2]
In the device according to claim 1,
In the case where “the deodorizing filter is provided upstream of the intake port”, the odor is removed when the air inside the kotatsu passes through the deodorizing filter by the operation of the fan.

The present invention has the following specific effects.
The accumulated heat in the air passage formed between the heater mounting plate heated by the heater and the plate above it is sent to the lower space from the vent hole formed in the heater mounting plate by the rotation of the fan. Therefore, the thermal efficiency of the electric kotatsu is improved by effectively using the staying heat.

Since the intake port is connected to the side space of the heater mounting plate, the hot air discharged downward from the heater is not sucked, but the relatively hot air existing in the side space of the heater mounting plate is sucked. Therefore, the intake air effectively absorbs the heat of the upper surface of the heater mounting plate. Therefore, also from this point, the thermal efficiency of the electric kotatsu is improved.

In the device according to claim 2, as described above, when the air inside the kotatsu passes through the deodorizing filter by the operation of the fan, the odor is removed.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
As shown in FIG. 1, a heater unit H is attached to a unit attachment frame 1 provided on the lower surface of the tower 20 having legs 21 attached to the lower portions of the four corners.

The heater unit H includes a heater mounting plate 25 in which the heaters 5 and 5 are attached to the lower surface via a bracket (not shown), and an air flow arranged so as to cover the heaters 5 and 5 below the heater mounting plate 25. A reticulated net-like unit cover 27 (see FIGS. 1 and 2) is provided. The heater mounting plate 25 is a rectangular metal plate, and a vent hole 30 is formed at the center thereof.

Above the heater mounting plate 25, the cover plate 7 which is the plate body described above with an interval provided is provided, and the interval corresponds to the “ventilation path 31” which is a specific matter described above. A flat heat insulating material 10 is disposed above the lid plate 7.
A fan 4 for sending the air in the ventilation path 31 of the heater mounting plate 25 to the lower space through the ventilation hole 30 is provided, and the intake port 9 at the upstream end of the ventilation path 31 is connected to the heater unit H. It is open on the side. The intake port 9 sucks air in the side space of the heater unit through a through hole 90 provided in the unit mounting frame 1 provided on the lower surface of the tower 20. Further, a deodorizing filter 14 is provided outside the through hole 90 on the upstream side of the intake port 9. Thereby, when the fan 4 is operated, the air in the kotatsu is sucked from the through hole 90 to the intake port 9 via the deodorizing filter 14.

Reflecting plates 2 that reflect the radiant heat of the heater 5 downward are disposed above and below the heater mounting plate 25 and each heater 5, and the reflecting plate 2 extends from both side edges of the horizontal top plate 27 to the side plates 28, 28 has an inverted saddle-shaped cross-sectional shape bent in a divergent shape.
In this case, as shown in FIG. 1, the top of the tower 20 is covered with a futon 6 and the top plate 8 is further placed thereon.
When heating is started, the fan 4 rotates and the heater 5 generates heat, and the radiant heat from the heater 5 is reflected downward by the reflector 2 to warm the inside of the kotatsu.

On the other hand, when the fan 4 rotates as described above, the air inlet 9 opened in the side surface of the heater unit H sucks air in the side space of the heater unit H through the outer through hole 90. Accordingly, the heated air released downward from the heater 5 is not inhaled. The air sucked into the air inlet 9 flows through the air passage 31 formed between the heater mounting plate 25 and the upper cover plate 7 by the action of the fan 4 and enters the lower space from the air vent 30. Sent out.
As described above, the staying heat of the air passage 31 formed between the heater mounting plate 25 heated by the heat generation of the heater 5 and the lid plate 7 thereabove is established at the center of the heater mounting plate 25 by the rotation of the fan 4. From the vent hole 30 made, it is sent into the kotatsu below it. Therefore, the heat staying in the air passage 31 of the heater mounting plate 25 is not increased as in the case where the air vent 30 is not formed, and the staying heat is effectively used to improve the thermal efficiency of the electric kotatsu. Further, since the air in the side space of the heater unit H is sucked into the air passage 30 of the heater mounting plate 25 through the deodorizing filter 14, when the air inside the kotatsu passes through the deodorizing filter 14, the odor Is removed.

Next, a heater unit for an electric kotatsu according to a second embodiment of the present invention will be described with reference to FIGS.
An air inlet 9a is provided in the vicinity of the outer periphery of the heater mounting plate 25, and high-temperature air heated by the heater 5 is prevented from flowing into the air inlet 9a in a short circuit inside the air inlet 9a. In other words, a guide plate 9b is provided for allowing air in the side space of the heater unit H to be sucked by the intake port 9a.
In this configuration, air in the side space of the heater unit H is sucked from the intake port 9a (see FIGS. 3 and 4) opened near the outer periphery of the heater mounting plate 25, and the air passage 31 above the heater mounting plate 25 is passed through. It flows and releases the staying heat downward from the vent hole 30.
Therefore, even when the upper outer periphery of the heater unit H is closely fitted into the unit mounting frame 1 provided on the lower surface of the tower 20, it is not necessary to form the through holes 90 in the unit mounting frame 1 as shown in FIG.

Sectional drawing of the principal part of the electric kotatsu provided with the heater unit H which concerns on embodiment of this invention Bottom view of heater unit H according to an embodiment of the present invention Sectional drawing of the principal part of the electric kotatsu provided with the heater unit H which concerns on 2nd Embodiment of this invention. Bottom view of heater unit H according to the second embodiment of the present invention (however, the guide plate 9b is omitted). Illustration of conventional example Illustration of conventional example

Explanation of symbols

4 ... Fan 5 ... Heater 9 ... Intake port 25 ... Heater mounting plate 27 ... Unit cover 30 ... Vent hole 31 ... Ventilation path

Claims (2)

A heater mounting plate with a heater attached to the lower surface;
A vent hole formed in the heater mounting plate;
A fan for sending air in a ventilation path formed between the heater mounting plate and a plate body thereabove to the lower space through the ventilation holes;
A heater unit for electric kotatsu, comprising a unit cover having air permeability arranged in a manner covering the heater and the fan below the heater mounting plate,
A heater unit for an electric kotatsu, comprising an air inlet that is opened on a side surface of the heater unit or in the vicinity of the outer periphery of the heater mounting plate and sucks air in a side space of the heater unit. The heater unit for an electric kotatsu according to claim 1, wherein a deodorizing filter is provided upstream of the intake port.