JPH0621692B2 - Heater for digging kotatsu - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heater unit used inside a dug kotatsu.

As shown in FIG. 2, a conventional dig kotatsu is provided with a box-shaped partition frame 2 in the center of the bottom surface of the dig kotatsu 1, in which a heater 3 for the dig kotatsu is installed, and an opening of the partition frame 2 is provided. There is a grid 4 placed on the part to keep warm, or a partition frame is not made as shown in FIG. 3, and the dig kotatsu heater 3 is installed on the bottom of the dig kotatsu 1, and the grid 4 is placed on top of it to keep warm. It was like taking them, but in each of the dug kotatsu, the upper yagura had pillars attached to the four corners. However, recently, the pillars attached to the four corners of the yagura of the dig kotatsu have been removed so that the feet can be inserted not only from the four sides of the dig kotatsu, but from anywhere.
Instead, a mushroom-shaped yagura has been devised, which has a pillar installed at the center of the dug kotatsu to support the dug kotatsu top plate.

Problems to be Solved by the Invention However, in the case of a dig kotatsu having a mushroom-shaped yagura, it is not possible to install a heater for dig kotatsu in the central part of the bottom surface of the dig kotatsu like the conventional dig kotatsu. Four
Since it is biased to one of the sides, the temperature distribution in the dig kotatsu is also biased, and when I put my foot in the dig kotatsu from one place, I feel too warm as it is too hot, but from other places When I put my feet in, I had the problem of not being warm.

Means for Solving the Problems In order to solve the above problems, the digging kotatsu heater of the present invention includes a plurality of units each having a heating element, and each unit is electrically connected by an intermediate cord. To form a heater unit, connect a temperature controller and temperature fuse in series with the heating element in this unit, and remove the unit closest to this power source The heating element in the unit is connected in parallel with the heating element in the unit closest to the power source, and each heating element is connected in series with an overheat protector and a temperature fuse and is connected to the power source. Connect the temperature controller and thermal fuse in the closest unit in series so that the temperature controller in the unit closest to the power supply normally controls the heating elements in all units. However, in the event of an abnormality, the heating element in each unit is controlled by a temperature controller or an overheat protector.

Working The operation of this technical means is as follows.

That is, a plurality of units are installed around the pillar provided at the center of the digging kotatsu, and usually the temperature controller in the unit closest to the power source controls the heating elements in all the units. There is no bias in the temperature distribution inside the kotatsu, and you can get a warm feeling no matter where you put your foot from in the kotatsu. Also, in the event of an abnormal situation where foreign matter such as clothing falls on any of the units and the temperature rises rapidly,
If it falls on the unit closest to the power supply, the temperature controller inside the unit closest to the power supply controls the unit to prevent fire and other hazards, and place it on a unit other than the unit closest to the power supply. In case of a drop, the overheat protector in the unit controls the temperature separately from the temperature controller in the unit closest to the power supply to prevent the risk of ignition. Furthermore, when the temperature controller or overheat protector fails in the ON state and the heating element continues to be energized,
The thermal fuses in each unit stop the energization before the temperature becomes dangerous.

Example Hereinafter, a heater for excavating kotatsu according to an example of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the unit 5a has a heating element 6, a temperature controller 7, and the units 5b, 5c, and 5d each have a heating element 6, an overheat protector 8, and a thermal fuse 11. 4 units 5a, 5b, 5c, 5d are 3
The digging kotatsu heater unit 3 is electrically connected by the intermediate cord 9 of the book and constitutes the digging kotatsu heater unit 3. As shown in FIG.
The heating element 6 in each unit 5a, 5b, 5c, 5d is connected in parallel to the power source, and each heating element 6 has the same capacity. Also, the unit 5a closest to the power source
The internal temperature controller 7 and the thermal fuse 11 are the unit 5a,
5b, 5c, 5d connected in series to the heating element 6 in,
The overheat protector 8 and the temperature fuse 11 in the units 5b, 5c, and 5d are connected in series to the heating element 6 in each of the units 5b to 5d. In the present embodiment, the temperature controller 7 mechanically controls energization such as a thermostat, but may be electrically controlled such as a triac. In this way, the units 5a, 5b, 5c, 5d can be arranged around the column 10 at the center of the excavation kotatsu 1, as shown in FIG. 5 and FIG. Since the kotatsu heater unit 3 is normally controlled by the temperature controller 7 of the unit 5a, for example, in the X direction in FIG.
There is no bias in the temperature distribution in the vertical direction in any of the Y directions, and the temperature distribution is symmetrical about the column 10. Therefore, a warm feeling can be obtained no matter which direction the foot is put in the digging kotatsu 1. Further, for example, even if foreign matter such as clothes falls on the unit 5b and is kept warm, and the temperature of the unit 5b rises sharply, the overheat protector 8 in the unit 5b controls the heating element 6 in the unit 5b. It
This also applies to the units 5c and 5d. When a foreign substance falls on the unit 5a and is kept warm, the temperature controller 7 in the unit 5a causes the heat generated in all the units 5a, 5b, 5c and 5d. The body 6 will be controlled.

Furthermore, when the temperature controller 7 of the unit 5a fails in the ON state and the heating element 6 in the unit 5a continues to be energized,
Before the thermal fuse 11 in the unit 5a receives the heat of the heating element 6 and becomes in a temperature dangerous state, the energization of the digging kotatsu heater unit 3 is stopped. Further, for example, when the overheat protector in the unit 5b fails in the ON state and the heating element 6 in the unit 5b continues to be energized, the temperature fuse 11 in the unit 5b causes the heating element 6 in the unit 5b to The energization to the unit 5b is stopped before the temperature becomes dangerous due to receiving the heat. This also applies to the units 5c and 5d. In addition,
In the present embodiment, the excavation kotatsu having the pillar at the center has been described as an example, but the heater for excavation kotatsu of the present invention can also be used for the conventional excavation kotatsu, and has the same effect as the example.

EFFECTS OF THE INVENTION As described above, the heater for excavating kotatsu according to the present invention can dispose a plurality of units around the pillar provided at the center of the excavating kotatsu, and normally all the heat generated in all the units is generated. All heating elements are controlled by the temperature controller in the unit closest to the power source, which is connected in series with the body, so the temperature distribution in the dig kotatsu is uniform and symmetrical with the pillar as the center. So, you can get a warm feeling no matter where you put your foot from in the kotatsu. In addition, in the unit closest to the power supply, there is a temperature fuse connected in series with all the heating elements in addition to the temperature controller connected in series with all the heating elements. All units except the unit on the side have an overheat protector and a thermal fuse that are connected in series only to the heating element in each unit, so foreign matter such as clothing may not be on each unit. Even if the unit is dropped, each unit can be controlled by a temperature controller or an overheat protector in each unit so as not to be in a dangerous state such as a foreign substance such as clothes being ignited. In addition, the temperature controller or overheat protector is
Even if the failure occurs in the N state and the heating element continues to be energized, the energization can be stopped before the temperature becomes dangerous by the thermal fuse, and the following effects are also obtained.

That is, the present invention can be used not only for the excavation kotatsu having the mushroom-shaped yagura for supporting the excavation kotatsu top plate by installing the support pillar at the center of the excavation kotatsu, but also for the conventional excavation kotatsu. Also, since each unit is placed closer to the periphery than the center of the digging kotatsu, when you normally put your foot inside the digging kotatsu, your feet will come to the top of each unit and the heat of the unit from the beginning of energization. The problem of the conventional digging kotatsu that the foot is received and the foot is cold at the beginning of electricity can be solved.

[Brief description of drawings]

FIG. 1 is a perspective view of a heater unit for excavating kotatsu according to an embodiment of the present invention, FIGS. 2 and 3 are views showing the actual use of a heater for excavating kotatsu, and FIG. 4 is an embodiment of the present invention. FIG. 5 is a circuit diagram of a heater unit for excavating kotatsu as an example, FIG. 5 is a diagram showing the actual usage of the heater unit for excavating kotatsu according to one embodiment of the present invention, and FIG. 6 is a heater unit for excavating kotatsu according to one embodiment of the present invention. FIG. 1 ... dig kotatsu, 3 ... dig kotatsu heater unit, 5
a, 5b, 5c, 5d ... Unit, 6 ... Heating element, 7
...... Temperature regulator, 8 ...... Temperature overheat protector, 9 ...... Intermediate code, 10 ...... Post, 11 ...... Temperature fuse.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic data Sho 57-5660 (JP, U) Real development Sho 56-50953 (JP, U) Actual public Sho 56-27474 (JP, Y2)

Claims (1)

[Claims] 1. A plurality of units having a heating element are provided, each unit is electrically connected by an intermediate cord to form a heater unit, and temperature control is provided in a unit closest to a power source. And a thermal fuse connected in series with the heating element in this unit, and the heating elements in the other units except the unit closest to this power supply are the heating elements in the unit closest to the power supply. Each of them is connected in parallel, and each heating element is connected in series with an overheat protector and a temperature fuse, and in series with a temperature controller and a temperature fuse in the unit closest to the power source. Normally, the temperature controller in the unit closest to the power supply controls the heating elements in all units, and in the case of an abnormality, the temperature controller or overheat protector is used in each unit. Kotatsu heater drilling formed by controlling the heating element.