JPH05312342A - Temperature controller for electric carpet - Google Patents

Abstract

PURPOSE:To automatically correct the surface temperature of a carpet cover by stopping power supply to a heating means at a point of time when the temperature of an electric carpet reaches a preset temperature and supplying power again to the heating means after finishing the counting of time. CONSTITUTION:The surface temperature of a carpet body is set to a predetermined level, and a power source switch 12 is closed. A resistance value of a temperature sensitive layer decreases according to an increase in the temperature of the carpet body and, when an output voltage of a temperature detection circuit 13 exceeds an output voltage of a temperature setting circuit 15, a relay contact 21 is opened to stop power supply to a heater 4. At the same time, a timer means 18 starts the counting operation for a period of counting time in accordance with the preset temperature. When the counting operation for a predetermined period of counting time is finished, the relay contact 21 is closed to supply power to the heater 4. By this method, the surface temperature of a carpet cover can be automatically corrected according to a thickness of the cover or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for an electric carpet which is used by mounting a cover on the electric carpet.

[0002]

2. Description of the Related Art An electric carpet is used by laying it on a floor or a tatami mat, but a cover is placed on the upper surface of the carpet because dirt and dust adhere to it. (JP-A-2-
However, when the cover is placed, the temperature of the cover decreases depending on the thickness of the cover and the weight per unit area (the amount of fibers per square meter). I was raising the set temperature. In this method, the user has to change the set temperature each time according to the thickness of the cover and the weight per unit area, which is troublesome.

[0003]

For the above reason, the correction means for changing the set temperature by judging the thickness and basis weight of the cover is provided. However, in addition to the original temperature setting means, the set temperature is changed. However, there is a drawback that the circuit configuration becomes complicated because it is necessary to provide the correction means. (JP-A-2-27028
(Gazette No. 2)

[0004]

A first construction is to mount a cover on an electric carpet having heating means, temperature detecting means for detecting the temperature by the heating means, temperature setting means for the heating means, and timer means. When the temperature of the electric carpet reaches a set temperature, the timer means stops the energization to the heating means or reduces the heat generation amount, and after the time measurement is finished, the heating means is energized again. Is to do. In the second configuration, the time measured by the timer means is set short when the set temperature is high and long when the set temperature is low.

[0005]

When the temperature of the electric carpet reaches the preset temperature, the cover is placed on the upper surface of the electric carpet by the thickness and the basis weight of the cover in order to stop energizing the heating means or reduce the amount of heat generation for a predetermined time. The surface temperature of is automatically corrected. Further, since the time measured by the timer means is changed according to the set temperature, the surface temperature of the cover does not become too low when the preset set temperature is high.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
1 is a schematic circuit diagram of a temperature control device for an electric carpet of the present invention, FIG. 2 is a plan view of an electric carpet similarly having a cover, and FIG. 3 is a sectional view of FIG.

(1) is a carpet body, (2) is a base made of felt, (3) is a brushed upper ground, and (4) is arranged meandering between the base (2) and the upper ground (3). The heating means (hereinafter referred to as a heater), (5) is a temperature detection line which is arranged in a meandering manner adjacent to the heater, and (6) is a controller which is arranged at a corner of the carpet body (1), It has a control circuit inside. (7) is the power switch knob
(8) is a temperature setting knob.

The temperature detecting wire (5) is a pair of conductors (9).
A temperature sensitive layer (10) whose resistance value changes with temperature is interposed between (9). Reference numeral (11) is a cover placed on the upper surface of the carpet body (1). (12) is a power switch that is opened / closed by the power switch knob (7), and (13) is a temperature detection circuit that detects a change in resistance value of the temperature sensitive layer (10), together with the temperature sensitive layer (10). It constitutes a temperature detecting means (14). (15) is a temperature setting circuit for setting the surface temperature of the carpet main body (1) by the temperature setting knob (8), which constitutes temperature setting means (16). (17) is a comparing means for comparing the outputs of the temperature detecting circuit (13) and the temperature setting circuit (15), and (18) is a timer means for measuring a predetermined time by the output of the comparing means. When the set temperature is high in conjunction with the output of (15), the time counting time is set short, and when the set temperature is low, the time counting time is set long. Reference numeral (19) is a logic means (AND gate) which receives the outputs of the comparison means (17) and the timer means (18), and (20) is a drive means for driving to the output of the logic means, the heater (4). The relay contact (21) connected in series with is opened and closed. (22)
Is a commercial AC power supply.

Next, the operation will be described with reference to the cover thickness and carpet temperature change characteristic charts shown in FIGS. 1 and 4 and the cover thickness and carpet body temperature characteristic charts shown in FIG. A case will be described in which a cover (11) having a thick or large basis weight is placed on the upper surface of the carpet body (1). The surface temperature of the carpet body (1) is previously set to a desired temperature by the temperature setting knob (8) (set temperature (S), FIG. 5).
Operate the power switch knob (7) to turn the power switch (1
2) is closed. At this point in time, since the resistance value of the temperature sensitive layer (10) is large, the output of the temperature detection circuit (13) is "L" and the output of the temperature setting circuit (15) is "H". Further, the output of the timer means (18) is "H" because the temperature setting circuit is "H" and the timing operation is not performed, and the output of the logic means (19) is "H". ) Is driven to close the relay contact (21) to energize the heater (4).

The timed time (t) of the timer means (18) is set according to the set temperature (S) of the temperature setting circuit (15) associated with the operation of the temperature setting knob (8). The timer means (18) does not start the time counting operation as described above. When the resistance value of the temperature sensitive layer (10) decreases with the temperature rise of the carpet body (1) and the output voltage of the temperature detection circuit (13) exceeds the output voltage of the temperature setting circuit (15), the comparing means The output of (17) becomes "L", the output of the logic means (19) becomes "L" by this output, the relay contact (21) is opened, the energization of the heater (4) is stopped, and the timer means (18). ) Starts the timekeeping operation of the timekeeping time according to the set temperature (S). At this time, the temperature drop of the carpet body (1) is caused by the cover (11) as shown in FIG.
Is thick or has a large basis weight, and therefore becomes gentle.

Eventually, when the timekeeping operation for a predetermined time is finished, the output of the timer means (18) becomes "H",
Further, since the temperature of the carpet body (1) is also lower than the set temperature, the output of the comparison means (17) is also "H", and the output of the logic means (19) is "H". The relay contact (21) is closed to energize the heater (4). Hereinafter, this operation is repeated.

As described above, when the cover (11) is thick or the basis weight is large, the temperature drop is gentle as shown in (P) of FIG. 5, so that the heater (4) after the time measurement (t) is finished. The temperature of the carpet body (1) at the start of energization to the vehicle becomes high, and the average temperature is stable at a high state. If you put a thin or heavy cover,
The same operation as described above is repeated, but as shown in (Q) of FIG. 5, the temperature of the carpet main body (1) is rapidly lowered, so that when the electricity is supplied to the heater (4) after the measurement time (t) ends. The temperature of the carpet body (1) becomes low and the average temperature is stable at a low state.

When the desired temperature is set by the temperature setting knob (8), the above-mentioned clocking time is changed according to the set temperature, and when the set temperature is high, the clocking time is shortened to keep the average temperature high. To do so. This prevents the carpet body from being maintained at a low temperature despite the high set temperature. Further, when the set temperature is low, the time measuring time is lengthened to keep the average temperature low.

In the present invention, the heater is de-energized when the temperature of the carpet body reaches the set temperature. However, the heater may be energized slightly without completely de-energizing. In this case, for example, when the timekeeping time is set to be long due to various restrictions, it is possible to prevent the temperature difference between when the set temperature is reached and when the timekeeping time is over from increasing.

[0015]

As described above, according to the present invention, when the temperature of the electric carpet reaches the set temperature, the energization of the heating means is stopped or the heat generation amount is reduced for a predetermined time. Can automatically correct the surface temperature of the cover. Further, since the time measured by the timer means is changed according to the set temperature, the surface temperature of the cover will not be too low when the preset temperature is high and will not deviate significantly from the set temperature, and the surface temperature will be low when the set temperature is low. Can be prevented from rising.

[Brief description of drawings]

FIG. 1 is a schematic circuit diagram of a temperature control device for an electric carpet of the present invention.

FIG. 2 is a plan view of an electric carpet with a cover mounted thereon.

FIG. 3 is a sectional view of FIG.

FIG. 4 is a temperature change characteristic diagram of the cover thickness and the carpet body.

FIG. 5 is a temperature characteristic diagram of the thickness of the cover and the carpet body.

[Explanation of symbols]

 1 Carpet Main Body 4 Heating Means (Heater) 11 Cover 14 Temperature Detection Means 16 Temperature Setting Means 18 Timer Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyoki Yoshida 3-201 Minamiyoshikata, Tottori-shi, Tottori Sanyo Electric Co., Ltd. (72) Inventor Naohiko Kishimoto 3-201 Minamiyoshikata, Tottori-shi Tottori Sanyo Denki Within the corporation

Claims (2)

[Claims] 1. An electric carpet having a heating means, a temperature detecting means for detecting a temperature by the heating means, a temperature setting means for the heating means, and a timer means, wherein the timer means is used. At the time when the temperature of the electric carpet reaches a set temperature, the energization to the heating means is stopped or the heat generation amount is reduced during the time counting, and the heating means is energized again after the time counting is finished. Temperature control device. 2. The temperature control device for an electric carpet according to claim 1, wherein the time measured by the timer means is set short when the set temperature is high and long when the set temperature is low.