JP3170846B2 - Heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the safety of a heating device having a heater for warm air heating and a heater for radiant heating.

[0002]

2. Description of the Related Art Conventionally, this type of electric heating apparatus generally has a structure as disclosed in Japanese Patent Application Laid-Open No. 60-60454. Hereinafter, the configuration will be described with reference to FIG. In the figure, 1 is a main body of the electric heating device,
A blower 2 and a heater 3 for warm air heating are provided in the main body 1,
It has an air inlet 4 and a warm air outlet 5. A radiation heating heater 6 is provided on the front surface of the main body 1.

In the above-described conventional configuration, the hot air heating function of the electric heating device is such that air flowing into the main body 1 from the air suction port 4 is pressurized by the blower 2 and further heated by the heater 3 for hot air heating. It is blown out of the warm air outlet 5 into the room. In the radiant heating function, the radiant heating heater 6 generates heat and radiates heat to the front surface. The warm air heating function part and the radiant heating function part are provided completely independently of each other at the partition walls.

[0004]

In the electric heating apparatus having such a conventional configuration, the power supply is stopped when an abnormality such as the lower portion of the front surface of the main body 1 having the hot air outlet 5 is closed. In this case, an overheating prevention device (not shown) for warm air heating is provided near the hot air outlet 5,
Since the portion of the heater 3 for hot air heating and the portion of the heater 6 for radiant heating are independently shielded from each other, when the operation state is radiant heating, the device for preventing excessive temperature rise for hot air reduces the internal temperature rise. It could not be detected, and it was not possible to prevent abnormal temperature rise due to the vicinity of the lower part of the heater 6 for radiation heating and an obstruction. That is, when the operation state is the radiant heating, it is necessary to provide a radiant heating overheat prevention device (not shown) also near the lower part of the radiant heating heater 6, so that safety is guaranteed regardless of the operation state. However, it is necessary to provide a number of overheating prevention devices, which complicates the control circuit.

The present invention has been made to solve the above-mentioned problems, and is capable of stopping power supply when the temperature is abnormal irrespective of the operation state of the radiant heating and the hot air heating without increasing the overheating prevention device or the like. The purpose is to provide a highly reliable heating device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an air inlet at the rear of a case, an opening at an upper portion at the front of the case, and a hot air outlet at a lower portion, and a hot air outlet in the case. Providing a blow-off air path communicating the air suction port and the warm-air blow-out port, providing a blower at the top of the blow-out air path and a heater for warm air heating downstream of the blower,
Further, a heater for radiant heating is provided between the outlet air passage and the opening on the front surface of the case, a through hole communicating with the opening portion on the front surface of the case, and the through hole and the heater for radiant heating are provided on the outlet air passage. An excessive temperature rise prevention device is provided between them.

[0007]

According to the heating device of the present invention, the heater portion for warm air heating and the heater portion for radiant heating communicate with each other through the same through-hole, and an overheat prevention device is provided near the through-hole. In the event of an abnormal condition such as when the front of the main unit is closed, if the operating condition is hot air heating, the heated air that has settled in the blow-out air passage rises through the through-hole and an overheating prevention device is installed. Activate. When the operation state is the radiant heating, the excessive temperature rise prevention device is operated by the heated air that has stuck under the radiant heating heater.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an internal configuration of an electric heating device according to one embodiment of the present invention, and FIG. 4 is an external view of the same embodiment. 1 and 4, reference numeral 7 denotes a case, which is provided with an air inlet 8 on the rear surface of the case, an opening 9 on the upper part of the front surface of the case, and a hot air outlet 10 on the lower part of the front surface of the case. An L-shaped outlet air passage 11 communicating the air inlet 8 and the hot air outlet 10 is provided in the case 7, and a blower 13 is provided in a vertical portion 12 of the outlet air passage 11.
Are mounted with the rotating shaft 14 horizontal. Blower 13
A heater 15 for warm air heating is provided horizontally downstream of the heater. A front guard 16 is provided in the opening 9, and a radiant heating heater 17 having a smaller area than the opening 9 is provided between the front guard 16 and the blower 13. A through hole 19 communicating with the opening 9 is provided in the outlet air passage horizontal portion 18, and a first overheating prevention device 20 is provided between the through hole 19 and the radiation heating heater 17. Is provided with a second overheat prevention device 21. In the upper part of the case 7, an electric circuit as shown in FIG. 5 is formed, and only the heater 15 for hot air heating, the heater 17 for radiant heating is energized, and both the heater 15 for hot air heating and the heater 17 for radiant heating are provided. An operation control device 24 capable of selecting an operation mode by energization is provided.

The operation of the above configuration will be described. During warm air heating, the air sucked from the air suction port 8 passes through the case 7 and enters the blower 13. The air pressurized by the blower 13 is heated by the warm air heating heater 15, passes through the blow air passage 11, and is blown into the room from the warm air blow outlet 10. At this time, the temperature is kept low because the first excessive temperature rise prevention device 20 is outside the hot air path.

On the other hand, at the time of radiant heating, the heater 1 for radiant heating is used.
7 generates heat and radiates heat from the opening 10 to the front through the front guard 16. At this time, the hot air generated by the radiation heating heater 17 flows by natural convection from the through hole 19 to the upper convection port 23 through the suction port 22 below the opening 9 and the hot air blowing port 10, and from inside the case 7 to the case. 7 is discharged outside. At this time, the first overheating prevention device 20
The temperature is kept low because is in the air flow path of natural convection air.

As shown in FIG. 2, when the hot air outlet on the front of the case 7 is closed during the hot air heating, the air heated by the hot air heating heater 15 accumulates in the blowing air horizontal portion 18. Then, the temperature rises further through the through hole 19, and the first excessive temperature rise prevention device 20 detects the temperature of the heated air and stops the energization.

As shown in FIG. 3, when the front of the case 7 is closed during the radiant heating, the hot air due to the radiation of the radiant heater 17 accumulates in the lower part of the opening 9 and the first temperature rises excessively. The prevention device 20 detects the temperature and stops energization.
The second overheating prevention device 21 detects the temperature and stops the operation when only the upper part of the case 7 is closed during the radiant heating.

As described above, according to the electric heating apparatus of the embodiment of the present invention, the blowing air passage 11 through which the air heated by the hot air heating heater 15 flows and the opening 9 through which the heat is radiated by the radiant heating heater 17. Communicate with each other through the through hole 19,
A first overheating prevention device 2 is provided in the upper portion near the through hole 19.
0 is provided. And this first temperature rise prevention device 2
0 is provided outside the hot air path and in the air suction path of natural convection at the time of radiant heating, so that the first overheating prevention device 20 has a low temperature during normal operation regardless of the heating operation mode. . Then, in the event of an abnormality that the front surface is blocked, the first temperature rise prevention device 20 can sensitively detect an increase in the internal temperature and stop energization.

Further, since the excessive temperature rise prevention device 20 is provided in the vicinity of the hot air heating heater 15 mounting portion, when the blower 13 is abnormal, the abnormal temperature rise of the hot air heating heater 15 itself is detected. The energization can be stopped.

In this embodiment, electricity is used as the heat source of the heater, but other gases, oil, etc. may be used.

[0016]

As is apparent from the above embodiments, according to the present invention, the heater side for warm air heating and the heater side for radiant heating communicate with each other through a through-hole, and an overheating prevention device is provided in the through-hole. By providing, the temperature rise prevention device can detect the rise of the internal temperature regardless of the heating mode in the case of an abnormality such as the front is closed, and one temperature rise prevention device is used for both hot air heating and radiant heating. A highly reliable electric heating device serving as a safety device can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a heating apparatus according to an embodiment of the present invention at the time of radiant heating.

FIG. 2 is a vertical cross-sectional view when a lower portion of a front surface of a main body is closed during warm air heating according to the embodiment.

FIG. 3 is a vertical cross-sectional view when the lower part of the front surface of the main body is closed during radiation heating according to the embodiment.

FIG. 4 is an external perspective view of the front side of the heating device of the embodiment.

FIG. 5 is an electric circuit diagram of the embodiment.

FIG. 6 is a longitudinal sectional view showing the internal configuration of a conventional electric heating device as viewed from a side.

[Explanation of symbols]

 7 Case 8 Air Suction Port 9 Opening 10 Hot Air Blow Out Port 11 Blow Out Air Path 13 Blower 15 Heater for Heating Heating 17 Heater for Radiation Heating 19 Through Hole 20 Overheat Prevention Device

Continuation of the front page (56) References JP-A-3-1020 (JP, A) JP-A-48-36242 (JP, A) JP-A-60-60454 (JP, A) JP-A-5-34013 (JP, A) , A) Japanese Utility Model Showa 50-15757 (JP, U) Japanese Utility Model Showa 60-7560 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 3/04 305 F24C 7/04 F24H 9/20

Claims (1)

(57) [Claims] 1. An air inlet at the rear of the case, an opening at the top and a hot air outlet at the bottom on the front of the case, and a blower air communicating the air inlet and the hot air outlet in the case. A blower, a heater for warm air heating downstream of the blower, a heater for radiant heating between the blower airflow passage and the opening at the front of the case, and further comprising the blower airflow passage. A heating device provided with a through-hole communicating with the opening on the front surface of the case and an overheating prevention device between the through-hole and the radiant heating heater.