JPS5810904Y2 - heating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heating device that prevents abnormal overheating of a heating element that heats indoor air.

Generally, a conventional heating device has a main body a shaped like a rectangular parallelepiped, as shown in Fig. 4, and air outlets are provided at the upper and lower parts of the front surface of the main body a, respectively, extending over almost the entire length in the width direction of the main body a. A suction port C is formed.

Furthermore, a heating element d is built into the main body a corresponding to the entire length of the air outlet.

The indoor air is circulated by natural convection or the like and exchanges heat with the heating element d to heat the room.

On the other hand, such heating equipment is equipped with a safety device e such as a thermoswitch to detect the temperature of the air heated by the heating element d and to prevent abnormal overheating of the heating element d. , only one safety device e is provided in the central portion of the main body a.

By the way, if a part of the air outlet, which is formed over almost the entire length of the front width direction of main body a, is inadvertently blocked by something being placed on it, the air flow rate in that part will be extremely reduced. , the heating element d in the part corresponding to this blocked part becomes abnormally overheated.

However, in the conventional device, if the position where the abnormal overheating occurs and the safety device e are misaligned in the width direction, the abnormal overheating of the heating element d cannot be reliably detected.
In addition, if the air outlet is blocked even at the corresponding position, no airflow will occur, so it takes too long for heat transfer to occur after abnormal overheating occurs until the safety device e detects it immediately. There were serious safety shortcomings, such as the inability to

Examples of such prior art include Japanese Utility Model Publication No. 42-27420, Japanese Utility Model Application Publication No. 50-39246, or Japanese Utility Model Application Publication No. 50-39246.
The one shown in Japanese Patent No. 0-39247 is known.

For example, Japanese Utility Model Publication No. 45-27420 discloses that - in a flow path having a hot air outlet along the longitudinal direction on the side surface,
An electric hot air machine is provided with a heater divided into a plurality of parts and held by a holding insulator along almost the entire length of the flow path, and a hot air overheating preventer is provided in the longitudinal center of the flow path. It is shown.

According to such a configuration, if a part of the hot air outlet is inadvertently blocked as described above, the air flow rate in this part will be extremely reduced, and the heater in the corresponding part will be abnormally overheated. .

If the position of this abnormally overheated part and the overheating preventer are misaligned, it is clear that there is a danger that the overheating preventer will not be able to detect the abnormal overheating of the heater.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to divide the inside of the main body into a plurality of ventilation passages, and to configure the radiation fins provided in each ventilation passage with a positive characteristic resistor. It is an object of the present invention to provide a heating device that prevents the heating element from being abnormally overheated without using a safety device such as a temperature overrise preventer.

That is, the present invention divides the inside of the main body in the width direction into a plurality of ventilation passages using dividing fins, and the main body is provided with an air outlet and a suction port that communicate with the ventilation passages, and each ventilation passage has a positive characteristic. A heat radiation fin made of a resistor is provided.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is a main body formed in the shape of a rectangular parallelepiped, and on the front surface 2 of this main body 1, an air outlet 3 is formed in the upper part and a suction port 4 is formed in the lower part, extending over almost the entire length of the front surface 2 in the width direction. has been done.

Further, a mounting plate 5 is disposed inside the main body 1, and this mounting plate 5
A plurality of plate-shaped partitioning fins 7 are attached to the main body 1 to partition the inside of the main body 1 in the width direction into a plurality of ventilation passages 6 .

Furthermore, each ventilation passage 6 divided by the partitioning fins 7 has a heat dissipating plate-like heating element smaller than the fins 7 made of a positive characteristic resistor. A plurality of fins 8 are attached to the mounting plate 5, forming a heat generating portion 9 in each ventilation passage 6.

Although not shown, the heat generating parts 9 are electrically connected in parallel.

Next, the operation of the above configuration will be explained.

First, a voltage is applied to each heat generating part 9..., and the heat radiation fin 8
When ... is heated, these radiation fins 8...
... and the air inside the main body 1 are heated by heat exchange, so the air inside the main body 1 rises and flows out from the air outlet 3 to heat the room, and at the same time, low-temperature indoor air flows into the air inlet 4. Natural convection flows into the main body 1 from the inside.

By the way, if a part of the air outlet 3 is inadvertently blocked, natural convection in the ventilation passage 6 corresponding to the blocked part is stopped.

Then, the radiation fins 8 provided in this ventilation passage 6...
Because there is no heat exchange with the air,
The temperature of the radiation fins 8 rises rapidly.

However, since these radiation fins 8 are formed of positive characteristic resistors, when the temperature rises, the current flowing through the heat generating part 9 provided with these radiation fins 8 decreases. Decrease.

Therefore, the heat radiation fins 8 corresponding to the air outlet 3 in the closed portion are maintained at a predetermined temperature and will not become abnormally overheated.

Although the above embodiment uses natural convection of the air, there is no problem with forced convection using a fan or the like.

As described above, in the present invention, the inside of the main body is divided in the width direction into a plurality of ventilation passages by dividing fins, and the main body is formed with an air outlet and a suction port that communicate with the ventilation passages, and a plurality of ventilation passages are formed in each ventilation passage. Heat dissipation fins each made of a positive characteristic resistor were provided.

Therefore, even if the air flow inside the main body is inadvertently blocked at any part of the main body in the width direction, the heat dissipating fins are formed of a positive characteristic resistor, so the heat dissipating fins will overheat abnormally to a predetermined temperature or higher. There's nothing to do.

That is, it is possible to provide a heating device that is excellent in terms of safety and can reliably prevent abnormal overheating of the radiation fins without using a safety device.

In addition, since the heat dissipation fins provided in each ventilation passage are made of a positive characteristic resistor, the response of the heat dissipation fins to abnormal overheating within the ventilation passage is quick and reliable, and the heat dissipation efficiency of the heat dissipation fins is will improve.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a partially cutaway front view, Figure 2 is a longitudinal sectional view, and Figure 3 is a longitudinal sectional view.
The figure is a perspective view showing the heating element taken out, and FIG. 4 is a partially cutaway front view showing a conventional heating device. 1... Main body, 3... Air outlet, 4...
... Suction port, 6... Ventilation path, 7...
Compartment fin, 8...radiating fin (heating element),
10...Mounting body (heating element).

Claims (1)

[Scope of utility model registration request] a main body, a fin for partitioning the width direction of the main body into a plurality of ventilation passages, an air outlet and a suction port formed in the main body so as to communicate with the ventilation passages, and an air outlet and a suction opening provided in each of the ventilation passages, respectively. A heating device characterized by comprising a radiation fin made of a positive characteristic resistor.