JPH027404Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention not only makes it possible to make the heater unit much thinner than the conventional one, but also allows warm air to be supplied comfortably, and ensures reliable operation of the thermostat. ,
To provide a warm air type electric kotatsu in which a low capacity heater is always turned on to confirm operation, and the temperature of the floor surface can be maintained below a standard value when the low capacity heater is turned on.

[Conventional technology]

An example of a conventional heater unit designed to reduce the thickness of the heater unit is disclosed in Japanese Patent Application Laid-Open No. 59-66653. In the device shown in this patent application, the fan 1 is located inside the heater 2 and outside the reflector 3, as shown in FIG.

Further, as a circuit used in such a conventional kotatsu, there is a circuit as shown in FIG. That is,
A high capacity heater 5 and a low capacity heater 6 are connected in series to the power source 4, respectively, and a thermostat 7 is connected in series in the circuit including the high capacity heater 5. 8 is a motor for driving the fan, and 9 is a temperature fuse.

[Problem that the invention attempts to solve]

In cases like this, hot air may be supplied by the rotation of the fan as shown by the solid line arrow, but in places where there is no heater, cold air is supplied instead.
It wasn't always comfortable because the cold air mixed with the hot air. However, since the fan 1 is located outside the reflector 3, the heater unit has to be thick, and generally the thermostat that controls the temperature of the heater does not directly control the hot air generated by the fan. Because the kotatsu has a sensing structure, not only is it not possible to accurately control the temperature, but if the temperature of the kotatsu rises excessively and the thermostat 7 is activated, the high-capacity heater 5
is turned off, and only the low capacity heater 6 is turned on. Therefore, it is possible to confirm that the kotatsu is working, but if the low-capacity heater continues to turn on, the floor temperature will exceed the level specified by the Electrical Appliance and Materials Control Law, since this heater is usually of a capacity of 100W. There was a problem in that the temperature exceeded the standard 80 degrees Celsius, violating regulations.

[Means for solving problems]

This proposal was devised in view of the above problems.According to the present proposal, a heat shield plate is provided close to the decorative board, and a heat shield plate is provided opposite to the heat shield plate, and each of the heat shields is provided near the periphery and center of the decorative board. a reflecting plate having a plurality of holes and having elongated holes facing and parallel to each other;
A motor provided on the front side of the central part of this reflector,
A low-capacity rod-shaped heater provided along one long hole and connected in series to the power source; a high-capacity rod-shaped heater provided along the other long hole and also connected in series to the power source; a thermostat connected in series to the circuit including the heater and provided close to any of the plurality of holes near the center of the reflector; and a thermostat connected in series to the circuit including the low capacity heater. The main feature is that it consists of a half-wave rectifier and a fan that is rotated by the motor and is provided between a heat shield plate and a reflector plate.

[Effect]

In this type of proposal, since the fan is provided between the heat shield plate and the reflector plate, the heater unit can be designed much thinner than conventional ones, and the heat generated by the heater is reflected by the fan. Warm air is blown out from multiple holes near the periphery and center of the board, providing a uniform supply of warm air to the user, providing comfort.If the temperature of the kotatsu rises excessively, the temperature will be absorbed by the holes near the center of the reflector. This signal is transmitted to the thermostat corresponding to this hole, and the thermostat immediately operates to turn off the high-capacity heater. Only the low-capacity heater continues to turn on, but since a half-wave rectifier is connected in series to the circuit that includes the low-capacity heater, its capacity is halved, and the temperature never exceeds the standard value of 80°C. safe to use.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 11 denotes a reflecting plate having a substantially rectangular dish-shaped cross section and is fixed to the wooden frames 12 and 13 of the kotatsu body with machine screws 14 and 15. A motor 16 is fixed to the center of the reflecting plate 11 by appropriate means.

Long and narrow holes 17 and 18 are bored in the reflector plate 11 so as to sandwich the motor 16 therebetween, and rod-shaped heaters 19 and 20 are attached to the center of these long holes by appropriate means. However, as is clear from FIG.
1, and each lower surface 23, 24 of the reflector 1
It is installed so that it is located below 1.

A thermostat 25 is provided on one side of the reflecting plate 11 and controls the temperature of the heater. The peripheral edge of the reflector 11 has a slope 2 that slopes inward (upwards).
6, and a plurality of holes 27, 28, and 29 are bored in each of the other three sides of the sloped portion except for one side on which the thermostat 25 is attached. Furthermore, a plurality of holes 30, 31, and 32 are bored near the center of the reflector 11 in the vicinity of the motor 16. Of these holes, however, hole 32 is located adjacent to the thermostat.

33 is a heat shield plate located inside (above) the reflector plate 11.
The reflective plate is attached to the reflective plate in the vicinity of the decorative plate 34 by appropriate means. The peripheral edge of this heat shield plate has an inclined surface 35 facing outward (downward). A chamber 36 is formed by the reflective plate 11 and the heat shield plate 33. This chamber 36 has a disc-shaped fan 37 rotated by the motor 16. It is preferable that the fan has a plurality of blades 38 on its peripheral edge and is sized to cover each heater. 39 indicates a protection card.

The heater 20 is a 350W heating element in a high capacity example, and the heater 19 is a 100W heating element in a low capacity example, and is connected to a power source 40 as shown in FIG. That is, the heater 20 is connected in series from the power source 40 to the power source via the lead wire 41, the temperature fuse 42, the lead wire 43, and the lead wire 44, and the heater 19 is connected in series from the power source 40 to the power source through the lead wire 41, the temperature fuse 42, the lead wire 43, and the lead wire 44.
They are connected in series in a circuit that leads to the power supply via 43 and 44. The motor 16 is connected to a power source 40 in parallel to each heater. Thus, thermostat 25 is connected in series with the circuit that includes heater 20. However, the low capacity heater 19
A half-wave rectifier 45, such as a rectifier diode, is connected in series to the circuit including the rectifier.

Next, the operation of the kotatsu shown in this example will be described. When the heaters 19 and 20 are turned on and heated, the heat emitted from these heaters is reflected by the reflection plate 11.
The air in the chamber 36 formed by the heat shield plate 33 and the heat shield plate 33 is heated. When the fan 37 rotates due to the rotation of the motor 16, the warm air in the chamber 36 is pumped through the plurality of holes 27, 28, 29 at the periphery of the reflecting plate 11, the plurality of holes 30, 31, 32 near the center part, and further through the long holes. Comfortable warm air is blown out from the holes 17 and 18 and is supplied to the user.

Since the lower surfaces 23 and 24 of each heater 19 and 20 are located on the front side of the reflecting plate 11 with the elongated holes as boundaries, the heat from each heater is directly supplied to the user along with the warm air, and the overall Provides comfortable heating.

Furthermore, since the hot air blown out from the holes 32 directly touches the thermostat 25, if the temperature becomes excessively high, it immediately acts on the thermostat 25 to control the temperature of each heater. When the thermostat 25 operates in this manner, the heater 20 is cut off and turned off, but the heater 19 remains energized and remains lit.

However, even if the low-capacity heater 19 continues to be lit, its capacity is reduced to half, that is, due to the action of the half-wave rectifier 45.
The power output is 50W, and the floor temperature is kept below 80W, making it safe.

[Effect of idea]

As mentioned above, according to the present invention, the heater unit is designed to be much thinner than conventional ones, and not only is the heater unit uniformly supplied with warm air to the user, making it more comfortable, but also prevents the user from getting too hot when the temperature of the kotatsu rises. , the thermostat activates immediately, turning off the high capacity heater and leaving the low capacity heater on, but
Since the floor temperature is kept below the standard value, it is possible to provide a safe electric kotatsu.

[Brief explanation of drawings]

Figure 1 is a cutaway plan view of an embodiment of the proposed kotatsu, Figure 2 is a sectional view taken along the line in Figure 1, Figure 3 is a wiring diagram of the heater, and Figure 4 is a diagram of a conventional kotatsu. FIG. 5, which is a vertical cross-sectional view of the main part, is a wiring diagram of a conventional heater. 11...Reflector, 16...Motor, 17, 18
...Elongated hole, 19,20...Heater, 25...Thermostat, 27,28,29,30,31,3
2... Hole, 33... Heat shield plate, 34... Decorative board, 3
7...fan, 45...half wave rectifier.

Claims (1)

[Scope of utility model registration request] A heat shield plate provided close to the decorative board, and a plurality of holes provided facing the heat shield plate, each having a plurality of holes near the periphery and center, and bored parallel to each other, facing each other. a motor provided on the front side of the central part of the reflector, a low-capacity rod-shaped heater provided along one of the elongated holes and connected in series to a power supply, and a long hole on the other side. A high-capacity rod-shaped heater provided along the hole and also connected in series to a power source, and a plurality of holes connected in series to a circuit including this high-capacity heater and near the center of the reflector. A thermostat provided nearby, a half-wave rectifier connected in series to the circuit including the low capacity heater, and a fan rotated by the motor and provided between the heat shield plate and the reflector plate. A heated electric kotatsu.