JP2578962B2 - Digging kotatsu heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a digging kotatsu heater embedded in a floor.

2. Description of the Related Art Conventionally, this type of excavating heater generally has a configuration as shown in FIG.

That is, the heater unit 2 is fixed on the bottom of the kotatsu main body 1 embedded and installed on the floor, and the power cord 3, the controller 4 and the connection cord 5 are connected to the heater unit 2.
Are sequentially supplied through the power supply. The controller 4 has a built-in control device such as a triac for controlling the amount of electricity supplied to the heater unit 2, and has a large-sized radiating fan for radiating heat of the triac, a choke coil for preventing electric noise, a capacitor, and the like. ing. When the controller 4 falls into the kotatsu main body 1 or is covered with the skirt 6, a thermostat for shutting off the power supply is provided on the radiating fins in order to prevent the temperature of the controller 4 from rising abnormally due to the radiation of the triac. Installed.

However, in such a configuration, the heat of the triac causes the controller 4 to heat up, giving the user anxiety. Further, since the controller 4 has a built-in control device, a radiation fin of a triac, a choke coil, and the like, the controller 4 is large and heavy.

In addition, since the heat radiation is hindered only by the cover 4 being covered by the controller 4, the thermostat is activated immediately to shut off the power supply, and the temperature inside the kotatsu main body 1 decreases, so that the handling of the controller 4 requires careful attention. Met. In particular, as the power consumption of the heater unit 2 is increased, the above-mentioned disadvantage becomes more remarkable.

Therefore, an object of the present invention is to provide a digging kotatsu heater that has a compact operation unit that is easy to perform hand-held operation without anxiety due to heat generation, and that does not turn off the power as long as the operation unit is covered with a brim.

Means for Solving the Problems In order to achieve the above object, the present invention provides a control box having a built-in control device for controlling energization to a heater unit provided on the bottom of a kotatsu main body, installed on the bottom of the kotatsu main body. In addition, components for adjusting the control amount of the control device are provided in the operation unit.

Operation With the above-described configuration, there is no heat-generating component in the operation unit and the temperature does not rise, so that the user does not feel uneasy.
Further, the operation unit is compact and light, so that it is easy to use. Also, since the operation unit does not generate heat, there is no need to provide a safety device such as a thermostat, and as a result,
Even if the operation unit is covered with a bun, a problem such as turning off the heater unit does not occur.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an installation diagram of an excavator heater according to one embodiment of the present invention. Numeral 7 denotes a kotatsu main body embedded and installed on a floor surface 8, and a heating space 11 is constituted by the kotatsu main body 7, the tower body 9, and the skirt 10. Reference numeral 12 denotes a heater unit fixed on the bottom surface 13 of the kotatsu main body 7, which generates heat to generate a heating space.
11 is designed to warm. Reference numeral 14 denotes a control box attached to the bottom surface 13, and the heater unit 12 is electrically connected to the control box 15 via a relay cord 15. The mounting position of the control box 14 is on the lower side of the heater unit 12, and is not easily affected by the heat convection of the heater unit 12. Control box
Reference numeral 14 denotes a position where the temperature is the lowest in the kotatsu body 7, but in order to further enhance the heat radiation effect, the lower case 16 of the control box 14 is used.
Project below the opening 17 provided in the bottom
It faces the lower underfloor space. The control box 14 is connected to the operation unit 19 led out of the heating space 11 by a connection cord 18.
Is connected. Reference numeral 20 denotes a power outlet mounted on the side of the kotatsu main body 7, and power is supplied to the control box 14 by a power cord 21.

FIG. 2 is an enlarged partial sectional view of the control box 14. The control box 14 has an outer shell constituted by a lower case 16 and an upper case 22. The lower case 16 is made of metal and has a box shape with no gap so that moisture or the like in the underfloor space does not enter. The upper case 22 is made of synthetic resin in order to cut off the temperature inside the kotatsu 7. Inside the control box 14, a control circuit 23 and a dryac 24 for controlling the power of the heater unit 12 are provided, and the triac 24 is fixed to the lower case 22 via a metal mount 25. .

FIG. 3 is an embodiment of an electric circuit diagram of the digging heater according to the present invention. 26 is a heating element, 27 is a temperature sensor for detecting the temperature in the vicinity of the heating element 26, 28 is a temperature fuse for preventing abnormal temperature rise when the temperature sensor 27 is abnormal, and the heating element 26, the temperature sensor 27, and the temperature fuse 28 Are provided in the heater unit 12. Reference numeral 24 denotes a triac serving as a power control element, and reference numerals 29, 30, and 31 denote a volume, a fixed resistor, and a capacitor connected in series to the temperature sensor 27. 32 is a triac from the connection point 33 of the fixed resistor 30 and the capacitor 31
This is a diac which is a switching element connected to the gate terminal of 24. When the voltage at the connection point 33 exceeds a certain level, it conducts and sends a gate pulse to the triac 24 to turn on the triac 24. Reference numerals 34a, 34b, and 35 denote two choke coils and a capacitor for preventing electric noise in the circuit, and 36 denotes a power switch. The temperature sensor 27 has a positive temperature resistance coefficient such that when the temperature is low, the resistance value is small, and when the temperature is high, the resistance value is large. The volume 29 and the power switch 36 are housed in the operation unit 19, and the triac 24 and other electronic components are all housed in the control box 14.

 Next, the operation of the configuration of the embodiment will be described.

When the user turns on the power switch 36 of the operation unit 19, since the temperature of the heating space 11 is still low, the resistance value of the temperature sensor 27 is small, and therefore, the voltage applied to the capacitor 31 increases, and the voltage of the capacitor 31 increases. The charging time is fast. That is, the potential rise at the connection point 33 becomes faster, reaches the switching voltage of the diac 32 immediately, the diac 32 is turned on, the triac 24 is turned on with a large conduction angle, and the heating element is close to full energization. Current flows through 26. When the temperature of the temperature sensor 27 rises due to the heat generated by the heating element 26, the resistance value of the temperature sensor 27 increases, and the voltage applied to the capacitor 31 decreases, so that the potential of the connection point 33 reaches the switching voltage of the diac 32. Therefore, the triac 24 is turned on with a small conduction angle, and the current to the heating element 26 is reduced. That is, as the temperature of the temperature sensor 27 increases, the conduction angle of the triac 24 decreases, the current flowing through the heating element 26 decreases, the calorific value decreases, and the temperature of the heating space 11 is kept constant. I have. The triac 24 controls the power by phase control, and in this case, it involves a large amount of heat, but is appropriately radiated from the lower case 16 of the control box 14 to the underfloor space via the mount 25. .

Further, the user can adjust the temperature of the heating space 11 by operating the volume 29 of the operation unit 19.
As the resistance value of the volume 29 increases, the current flowing through the heating element 26 decreases, and the temperature of the heating space 11 decreases.

As described above, the operation unit 19 includes the volume 29 and the power switch 36.
Because it is only built-in, it can be made compact and light, and it is very convenient to operate it while holding it in your hand. Since the volume 29 and the power switch 36 generate almost no heat, the temperature of the operation section 19 hardly rises,
Therefore, the user does not feel a sense of temperature anxiety during the operation. In addition, since there is no heat-generating component in the operation unit 19, it is not necessary to provide a safety device such as a thermostat as in the conventional example. There is no such a problem that is turned off.

In addition, by providing the control box 14 containing the heat generating triac 24 and other electronic components on the bottom surface 13 having the lowest temperature in the kotatsu main body 7, the dimensional restriction of the control box 14 is reduced, and the radiation of the triac 24 is reduced. And the durability of the triac 24 can be increased. Control box as in the embodiment
By placing the lower part of 14 below the floor below the floor 13 of the kotatsu main body 7, the effect is further increased.

Effect of the Invention As described above, the present invention installs a control box having a built-in control device for controlling energization to the heater unit installed on the floor of the kotatsu main body on the bottom of the kotatsu main body, and reduces the control amount of the control device. Since the component to be adjusted is provided on the operation unit, the operation unit hardly generates heat, and the user does not feel anxiety about temperature. Further, since the operation unit can be made compact and light, it is easy to use. In addition, since it is not necessary to provide a temperature safety device in the operation unit, even when the operation unit is covered with a bun or the like, a problem such as turning off the heater unit does not occur. In addition, since the dimensional restriction of the control box is reduced, it can be made large enough to radiate heat of the electronic components.
As a result, the durability of the control device can be increased.

[Brief description of the drawings]

FIG. 1 is an installation diagram of a digging kotatsu heater according to one embodiment of the present invention,
FIG. 2 is a partial sectional view of a control box of the heater, FIG. 3 is an electric circuit diagram used for the heater, and FIG. 4 is an installation diagram of a conventional excavator heater. 7 ... Kotatsu main body, 12 ... heater unit, 14 ... control box, 19 ... operation unit.

Claims (2)

(57) [Claims] 1. A heater unit embedded in a floor and installed on the bottom surface of a box-shaped kotatsu main body having an upper opening, a control box containing a control device for controlling the power supply to the heater unit, and the control box An excavator heater comprising an operation unit for adjusting a control amount of the apparatus, wherein the control box is installed on a bottom surface of the kotatsu main body. 2. The digging kotatsu heater according to claim 1, wherein a part or the whole of the control box faces under the floor below the floor of the kotatsu main body.