JPS6193586A - Electric floor heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to electric floor heating appliances such as electric carpets.

Conventional configurations and their problems In recent years, among electric heaters, floor heaters, especially those using electric carpets, have improved in terms of comfort, safety, interior design, and
It is widely used due to its space-saving advantages.

The conventional electric carpet as described above will be described below with reference to the drawings.

FIG. 1 shows the structure of a conventional electric carpet. 1 is a carpet main body, 2 is a controller, 3 is a temperature control knob, 4 is a heating element, and 5 is a temperature sensor.

FIG. 2 is a circuit diagram of the electric carpet shown in FIG.
is a resistance for setting the maximum temperature, 13 is a signal processing circuit section,
14 is a power controller, 4 is a heating element, and 5 is a temperature sensor.

The operation of the electric carpet configured as above will be explained below.

First, in FIG. 2, when the power is turned on, a signal is input to the signal processing circuit section 13, and based on this signal, the power controller 14 becomes conductive, and the heating element 4 is energized. Here, in the main body 1, as shown in FIG. 1, a heating element 4 and a temperature sensor 5 are arranged in a meandering manner, and the temperature sensor 5 has a thermistor characteristic whose impedance changes with temperature. Upon receiving the heat, a signal corresponding to the body temperature enters the signal processing circuit section 13 from the temperature sensor 5.

When the signal reaches a certain set value, the power controller 14 becomes non-conductive, and the power supply to the heating element 4 is stopped. In this way, the temperature of the main body 1 is controlled, and the main circuit components that determine the set temperature are the variable resistor 11 and the resistor 12.
In particular, the resistor 12 is a circuit constant that sets the maximum temperature of the main body 1, and this is a constant determined from the viewpoint of safety performance as a product. In the case of contact heating such as electric carpets, the maximum temperature is determined based on temperature constraints from the viewpoint of low-temperature burns, fires and discoloration when partially kept warm with cushions, etc.

However, with the above configuration, when the main body 1 is used with a cover placed over it, the cover keeps the main body 1 warm, so the temperature sensor 5 quickly reaches the set value temperature and becomes non-conductive, causing the temperature sensor 5 to become non-conductive for a certain period of time. , the proportion of conduction time to the heating element (hereinafter referred to as conduction rate) decreases compared to the state without the cover, and furthermore, the presence of the cover reduces the thermal conductivity between the main body 1 and the user. Coupled with this, the user has had the problem of lacking a sense of warmth.

OBJECTS OF THE INVENTION In view of the above problems, the present invention provides an electric floor heating device that provides sufficient warmth even when a cover is placed over the electric floor heating device.

Structure of the Invention In order to achieve this object, the electric floor heating appliance of the present invention includes a main temperature control means and an auxiliary temperature control means in the temperature control section,
The auxiliary temperature control means is configured to change the maximum temperature of the main temperature control means depending on whether or not a cover is installed and its type. With this configuration, when a cover is installed on the main body, the auxiliary temperature control means changes. By this means, it is possible to raise the maximum temperature and obtain sufficient warmth.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows the electric carpet main body 1 and the cover 15 laid on the top surface thereof. Note that the temperature control means is built in the cord opening 16.

FIG. 4 shows a circuit diagram of the electric carpet according to the first embodiment of the present invention. In FIG. 4, reference numeral 11 denotes a variable resistor 1 for adjusting the operating temperature, which constitutes the main temperature adjusting means.
2' is a resistor group for setting the maximum temperature, which constitutes the auxiliary temperature adjustment means.

FIG. 5 shows a temperature controller having the above circuit configuration, in which 3 is a knob for adjusting the working temperature, and 6 is a switch for switching the resistor group for setting the maximum temperature.

The operation of the electric carpet constructed as above will be explained below.

First, regarding the temperature control of the electric carpet, the operation is basically the same as that of the conventional example, but the setting of the maximum temperature is different. By setting the selector switch 6 depending on whether or not the cover 15 is installed and the type thereof, the maximum temperature setting is changed by switching the resistor group 1i. Regarding the changeover switch 6, since the thermal resistance of each cover differs depending on the thickness and basis weight, it is practically impossible to assign a changeover switch to each cover 15. Therefore, cover 1
Due to the difference in thermal resistance of 5, for example, as shown in the table below, 6
Arrange the different types of covers with different thermal resistances in descending order of value, and the first to third groups are the first group (thin covers), and the fourth to sixth groups are
The average thermal resistance (
For the first group, 0,075nlH″C/KCa1 from the table
), a three-stage changeover switch will be used, including use without a cover.

Unit: Wl PiC/Kcal As described above, according to this embodiment, the temperature control section changes the maximum temperature according to the average thermal resistance of each group classified based on the difference in thermal resistance between the main temperature control means and the cover. By providing an auxiliary temperature control means, sufficient warmth can be obtained even when various types of covers are installed.

Effects of the Invention As described above, the present invention provides a temperature control unit with a main temperature control unit and an auxiliary temperature control unit that changes the maximum temperature according to the average thermal resistance of each group classified based on the difference in thermal resistance of the cover material. By providing this, sufficient warmth can be obtained even when various types of covers are installed, and the effect is great.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional electric carpet, and Figure 2 is a perspective view of a conventional electric carpet.
FIG. 3 is a circuit diagram of the electric carpet shown in the figure, and FIG. 3 is a perspective view showing the correspondence between the electric carpet and the cover in the present invention. FIG. 4 is a circuit configuration diagram of one embodiment of the present invention, and FIG. 5 is a perspective view of a temperature control section in one embodiment of the present invention. 1... Electric carpet body, 11, 3...
...Main temperature control means, 12,6...Auxiliary temperature control means, 15...Cover. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3

Claims (2)

[Claims] (1) A main body on which a cover can be placed, and a temperature control section of the main body, the temperature control section having a main temperature control means and an auxiliary temperature control means, the auxiliary temperature control means including:
An electric floor heating appliance configured to change the maximum temperature of the main temperature control means depending on whether or not the cover is installed and its type. (2) The electric floor heating appliance according to claim 1, wherein the auxiliary temperature control means changes the maximum temperature according to the average thermal resistance of each group classified into a plurality of groups based on differences in thermal resistance of the cover.