JPH033897Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a heater unit suitable for use in, for example, an electric kotatsu.

(b) Prior Art Recently, the demand for electric kotatsu has been increasing as a so-called furniture-like kotatsu that can be used all year round.

However, as heater units have come to be used year-round, improvements have been particularly desired in terms of how thin the heater unit can be. In other words, the heater unit conventionally used in furniture-style kotatsu is so thick that it protrudes from the underside of the kotatsu frame, causing foot traffic in the winter and getting in the way, and in the summer the heater unit is exposed, making it unsightly. It was hot.

For this reason, in recent years, there has been a call for thinner heater units, and various configurations have been attempted.One way to achieve this is to bring the distance between the protection card provided at the bottom of the heater unit and the heater fixed to the reflector closer together. However, the temperature of the protective guard rose due to the radiant heat from the heater, creating a risk of burns. As another means, in order to lower the temperature of the above-mentioned protective guard, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 57-195052, a fan for releasing hot air is installed inside the heater unit to release the hot air inside the heater unit. ing. Although this configuration allows the heater unit to be made slightly thinner than a heater unit that does not use a general discharge fan, it was not possible to make the heater unit sufficiently thin.

(C) Structure of the device The device includes a flat top plate, a flat reflector whose periphery is inclined downward, a space formed between the reflector and the guard, and a fan and a fan provided in the space. A configuration including one or more radiant heaters and a heat absorbing part whose surface is coated with a heat-resistant coating with good heat absorption, at least in a part of the reflector plate located on the periphery from a part located above the radiant heater. shall be.

(d) Examples Examples of the present invention will be explained based on the drawings. H is a heater unit having a substantially square plane and a substantially rectangular side cross section, and is suspended in the center of a frame F constituting the kotatsu K shown in FIG.

The aforementioned heater unit H will be explained in detail below.

Reference numeral 1 denotes a flat upper plate made of a material such as wood, which is provided on the uppermost surface of this unit and is used as a decorative plate. 2 is provided on the lower surface of the upper plate 1,
It is a reflective plate made of a metal material with a downwardly sloping tapered surface 3 on its outer periphery and whose cross section is approximately [shaped].
A proper portion of the upper surface is brought into close contact with the lower surface of the upper plate 1. Reference numeral 4 denotes a fixing frame for fixing the peripheral edge of the reflector plate 2 and the upper plate 1; 5 is provided below the reflector plate 2; The combined guards form a flat space 6 between them and the reflecting plate 2. 7 is the space 6
A motor is installed in the center of the interior and rotates a single fan 9 fixed to the shaft 8. The fan 9 has cooling blades 10, 1 inside as shown in FIG.
0... are provided and blowing blades 11, 11... are integrally formed on the outside. Reference numeral 12 denotes a mounting bracket having a flat mounting portion 13 at the bottom and mounting pieces 14, 14, 14, 14 extending upward in parallel on each opposing side, and the motor 7 is mounted on the mounting portion 13. It is mounted and fixed, and the mounting pieces 14, 14, 14, 14 are screwed and fixed to the lower surface of the reflecting plate 2. Numerals 15 and 15 are pipe-shaped red-hot type radiant heaters that are provided in the space 6 and are arranged in parallel on the outside with the fan 9 interposed therebetween. It is fixed apart from the plate 2. 17,
Reference numeral 17 denotes a heat shield plate fixed to the reflector plate 2 below the radiant heaters 15, 15 so as to cover substantially the entire surface thereof, and has a plurality of heat transmission holes 18, 18..., 18, 1.
8... is drilled. Reference numeral 19 indicates a terminal portion fixed to a part of the lower surface of the reflector plate 2, and 20, 20 indicates a terminal portion which is provided in close contact with or close to the lower surface of the reflector plate 2 adjacent to the radiant heaters 15, 15, and which absorbs heat on its surface. The heat absorbing part is coated with a heat-resistant coating made of a mixture of a silicate compound and a metal oxide with good properties. The area is such that one end edge is located slightly inside from directly above the radiant heaters 15, 15, and the other end edge is located on the entire surface of the tapered surfaces 3, 3 of the reflector plate 2.

Next, the operation will be explained. First, the heater unit H is suspended in the center of the frame F as shown in FIG. Then, a remote controller (not shown) is connected to the terminal portion 19 and the radiant heater 1
5, 15 and the motor 7. As the fan 9 rotates, the air sucked in by the cooling vanes 10, 10, . In addition, the wind taken in by the blower blades 11, 11...
As shown by the arrow B in the figure, the air passes through the outside of the cooling blades 11, 11..., and together with the above-mentioned intake air, the radiant heater 1
5 and 15, the hot air is converted into hot air, and is discharged from the outside of the heater unit H along the tapered surface 3 of the reflection plate 2.

Therefore, as shown in FIG. 3, the heater unit H suspended at the center of the frame F of the kotatsu K takes in air from the center of the unit and discharges hot air from the outer periphery.

In the above-mentioned usage condition, the radiant heater 15,
Most of the radiant heat 15 is radiated into the kotatsu K, but some of it is radiated in the circumferential direction and upper part of the heater unit H and is absorbed by the heat absorbing parts 20, 20, so that the reflected heat from the reflector plate 2 is reduced, and the temperature rise of the guard 5 is suppressed. That is, if the wall surface of the reflecting plate 2 facing the upper and lateral parts of the radiant heaters 15, 15 does not have a heat absorbing part and is subjected to a conventional reflection treatment, the radiant heater 1
Since the heat radiating to the upper part of the kotatsu is reflected to the guard 5 side by the reflection treatment part and radiated into the kotatsu, the guard 5 is directly connected to the radiant heater 15, 15.
It is heated to a high temperature by the radiant heat directed towards the guard side and the radiant heat reflected by the reflection plate 2 and radiated towards the guard side. However, when the heat absorbing part 20 is provided as in the present invention, the heat radiating upward from the radiant heaters 15, 15 is absorbed by the heat absorbing part without being reflected.
heating will be eliminated and the temperature of the guard will be well below the critical temperature. Therefore, since the temperature of the guard 5 does not become high, the guard and the radiant heater can be brought closer to each other.

Thus, although the present invention uses a metal plate separate from the reflector as the heat absorption part, the same effect can be achieved even if the lower surface of the reflector is directly coated with a heat-resistant coating. Further, the heater unit of the present invention can be used not only for kotatsu but also for various appliances. In use, the temperature of the reflector increases slightly due to heat absorption by the heat absorbing section, but since a flat upper plate is provided on the upper surface of the reflector, the temperature of the upper plate does not rise above the dangerous temperature. There isn't.

(e) Effects of the invention A flat reflecting plate with a downwardly sloping peripheral edge is provided on the lower surface of the flat upper plate, a guard is provided below the reflecting plate, and the space formed between the reflecting plate and the guard is A fan and one or more radiant heaters are disposed in the reflector, and the reflector has a heat-resistant coating with good heat absorption on its lower surface, at least in a portion located on the periphery from a portion located above the radiant heater. Most of the radiant heat from the radiant heater is radiated downward and used for heating, but some of the radiant heat in the upward or lateral direction is absorbed by the heat absorbing part. Since there is no radiant heat from the reflector, there is no rise in temperature of the guard, so the heater unit can be made thinner by bringing the guard and the radiant heater closer together. That is, by suppressing the temperature rise of the guard, the heater unit can be made thinner in addition to the hot air discharge effect by the fan, and the guard does not become hotter than necessary, thereby preventing burns. Further, the surface of the reflective plate is protected by the heat absorbing portion, thereby preventing the occurrence of rust.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway bottom view of the heater unit of the present invention, FIG. 2 is a sectional side view of the same, and FIG. 3 is an explanatory diagram showing the state of use. 1...Top plate, 2...Reflector, 5...Guard, 6
...Space, 15,15...Radiant heater, 20,
20... Endothermic part.

Claims (1)

[Scope of utility model registration request] A flat reflecting plate whose peripheral edge is inclined downward is provided on the lower surface of the flat upper plate, a guard is provided below the reflecting plate, and a fan or a fan is provided in the space formed between the reflecting plate and the guard. A plurality of radiant heaters are disposed, and a heat-resistant coating with good heat absorption is applied to the lower surface of the reflecting plate, at least from a portion located above the radiant heaters to a portion located at the periphery thereof. A heater unit characterized by being provided with a heat absorbing section.