JP2975765B2 - Electric carpet temperature controller - Google Patents

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 with a cover placed 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. A cover is placed on an upper surface of the carpet to adhere dirt and dust. (Japanese Unexamined Patent Application Publication No.
However, when the cover is placed, the temperature of the cover decreases according to the thickness and the basis weight (the amount of fiber per square meter) of the cover. The set temperature was increased. In this method, the user has to change the set temperature each time according to the thickness and the basis weight of the cover, which is troublesome.

[0003]

For such a reason, there is provided a correction means for changing the set temperature by judging the thickness and the basis weight of the cover. However, the correction means for changing the set temperature is provided separately from the original temperature setting means. However, there is a disadvantage that the circuit configuration is complicated because it is necessary to provide the correction means. (JP-A-2-27028)
No. 2)

[0004]

According to a first aspect, a cover is mounted on an electric carpet having heating means, temperature detecting means for detecting the temperature of the heating means, temperature setting means for the heating means, and timer means. The timer means stops the power supply to the heating means or reduces the calorific value during the timing when the temperature of the electric carpet reaches the set temperature, and supplies power to the heating means again after the completion of the time measurement. Is what you do. In the second configuration, the time measured by the timer means is set shorter when the set temperature is high, and set longer when the set temperature is low.

[0005]

When the temperature of the electric carpet reaches the set temperature, the power supply to the heating means is stopped for a predetermined period of time or the cover is placed on the upper surface of the electric carpet according to the thickness or the weight of the cover in order to reduce the amount of heat generated. Automatically corrects the surface temperature of Further, since the time measured by the timer means is changed according to the set temperature, when the preset set temperature is high, the surface temperature of the cover does not become too low.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic circuit diagram of the electric carpet temperature control device of the present invention, FIG. 2 is a plan view of the electric carpet having a cover mounted thereon, and FIG. 3 is a cross-sectional view of FIG.

[0007] (1) is a carpet body, (2) is a ground made of felt, (3) is a brushed upper ground, and (4) is a meandering arrangement between the ground (2) and the upper ground (3). A heating means (hereinafter referred to as a heater), (5) is a temperature detection line disposed in a meandering manner adjacent to the heater, and (6) is a controller disposed in a corner of the carpet body (1). The control circuit is installed. (7) is a power switch knob,
(8) is a temperature setting knob.

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

Next, the operation will be described with reference to the graphs of FIG. 1 and FIG. 4 showing the temperature change characteristics of the thickness of the carpet body and the thickness of the cover shown in FIG. A case in which a thick or large-weight cover (11) is placed on the upper surface of the carpet body (1) will be described. 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 (7) to operate the power switch (1
2) is closed. At this point, the output of the temperature detection circuit (13) is "L" and the output of the temperature setting circuit (15) is "H" because the resistance value of the temperature sensitive layer (10) is large. Also, the output of the timer means (18) is "H" because the temperature setting circuit is "H" and the timekeeping operation is not performed, and the output of the logic means (19) becomes "H" and the driving means (20) ) Is driven to close the relay contact (21) and energize the heater (4).

The time (t) of the timer means (18) is set in accordance with the set temperature (S) of the temperature setting circuit (15) accompanying the operation of the temperature setting knob (8). The timer means (18) does not start the timing operation as described above. When the resistance value of the thermosensitive layer (10) decreases as the temperature of the carpet body (1) increases and the output voltage of the temperature detection circuit (13) exceeds the output voltage of the temperature setting circuit (15), the comparing means is used. The output of (17) becomes "L", and the output of the logic means (19) becomes "L" by this output, thereby opening the relay contact (21), stopping the power supply to the heater (4), and the timer means (18). ) Starts the timing operation of the timing time according to the set temperature (S). The temperature drop of the carpet body (1) at this time is caused by the cover (11) as shown in FIG.
Is thicker or slower due to a large basis weight.

When the clocking operation of the predetermined clocking time ends, 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 comparing means (17) is also "H", so that the output of the logic means (19) becomes "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 weight per unit area is large, the temperature drop is gradual as shown in FIG. 5 (P). The temperature of the carpet body (1) at the start of energization of the carpet increases, and the average temperature stabilizes at a high state. If you put a thin or heavy cover,
The same operation as described above is repeated, but as shown in FIG. 5 (Q), the temperature of the carpet body (1) is rapidly lowered, so that the power supply to the heater (4) is started after the end of the time period (t). The temperature of the carpet body (1) decreases, and the average temperature stabilizes at a low state.

At the time of setting a desired temperature by the temperature setting knob (8), the above-mentioned timekeeping time is changed according to the set temperature, and when the set temperature is high, the timekeeping time is shortened and the average temperature is maintained at a high value. So that 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 clocking time is lengthened so that the average temperature is kept low.

In the present invention, the power supply to the heater is stopped when the temperature of the carpet body reaches the set temperature. However, the power supply to the heater may be slightly supplied without completely stopping the power supply. In this case, for example, when the timekeeping time is set long by various restrictions, it is possible to prevent the temperature difference between when the set temperature is reached and when the timekeeping time ends 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 calorific value is reduced for a predetermined time. Thereby, the surface temperature of the cover can be automatically corrected. Also, since the time measured by the timer means is changed according to the set temperature, when the preset set temperature is high, the surface temperature of the cover does not become too low so that the cover temperature does not greatly deviate from the set temperature. Can be prevented from becoming high.

[Brief description of the 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 the electric carpet with a cover mounted thereon.

FIG. 3 is a sectional view of FIG. 2;

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

FIG. 5 is a graph showing a temperature characteristic of a carpet body with respect to a thickness of a cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carpet main body 4 Heating means (heater) 11 Cover 14 Temperature detecting means 16 Temperature setting means 18 Timer means

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Toyoki Yoshida 3-201, Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (72) Inventor: Naohiko Kishimoto 3-201, Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) F24D 13/02

Claims (2)

(57) [Claims] 1. An electric carpet having a heating means, a temperature detecting means for detecting a temperature of the heating means, a temperature setting means of the heating means, and a timer means, wherein the timer means is used. When the temperature of the electric carpet reaches the set temperature, the energization of the heating means is stopped or the calorific value is reduced during the timing, and the energization of the heating means is performed again after the end of the timing. Temperature control device. 2. The electric carpet temperature control device according to claim 1, wherein the time measured by said timer means is set short when the set temperature is high and set long when the set temperature is low.