JPH06249451A - Electric carpet - Google Patents

Abstract

PURPOSE:To prevent a generation of a short accident caused by a melting of an electric source cord by setting a current suppression means suppressing a current flowing in the electric source cord through discrimination of the electric source cord temperature rising to an abnormal range of temperature. CONSTITUTION:By using a temperature sensor 12 mounted on a cord reel, a temperature of an electric cord 9 is detected by a second temperature detecting circuit 23, and whether the detected temperature exceeds a temperature that is set by a temperature standard circuit 24 or not is discriminated by a second comparison device 25. If a temperature of the electric cord 9 rises abnormally and exceeds the set temperature, an output of the second comparison device 25 becomes L from H, and the electric cord has a decreased electric current quantity which flows in itself and a self heat generation is suppressed. Thereby, the short accident caused by melting of an outside skin of the electric source cord can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric carpet in which a control box is integrally provided in a part of an electric carpet body, and a cord reel for winding a power cord is housed in the control box.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Application Laid-Open No. 61-98914, an electric carpet laid on a tatami mat or a floor to keep warm is derived from the electric carpet because it is provided in a human moving space, and the wall of a room is used. There was a possibility that the power cord to be connected to the outlet provided in the room would get in the way and the legs could get caught, causing the product to fall or the plug or cord to be broken.

Therefore, it is possible to wind an extra power cord around a cord reel and incorporate the cord reel in a control box.

[0004]

However, when the electric carpet is used, a large amount of power consumption continues for a long time while a large amount of the power cord is wound around the cord reel in the control box. However, there are drawbacks that the temperature rises and exceeds the heat resistant temperature, and the temperature of the control box housing the cord reel case rises. Further, since the electric component board is installed in the control box, there is a problem in heat resistance of components mounted on the electric component board. Furthermore, since the controller box may be covered with the cover of the electric carpet, the temperature may further increase. In addition, there is a drawback that the control box becomes large if the electric board and the cord reel are installed in the same control box.

Therefore, an object of the present invention is to solve the above-mentioned problems caused by housing the cord reel in the control box.

[0006]

According to a first aspect of the present invention, a control box accommodating an electrical equipment substrate having circuit components is integrally provided in a part of an electric carpet body, and the control box is provided in the control box. In an electric carpet containing a cord reel that winds a connected power cord, a temperature detecting unit that detects the temperature of the power cord and the temperature of the power cord rises to an abnormal temperature range based on the output of the temperature detecting unit. And a current suppressing means for suppressing the current flowing through the power cord.

According to a second aspect of the present invention, a control box accommodating an electrical equipment board having circuit components is integrally provided in a part of an electric carpet body, and a power cord connected to the control box is provided in the control box. In an electric carpet containing a cord reel to be wound up, a heat shield wall is provided in the control box at a boundary between the electric board and the cord reel.

In a third aspect based on the second aspect, the control box has a substantially rectangular shape and is arranged at a corner of the electric carpet main body, and the electric board and the cord reel are horizontally arranged in the control box. The cord reels are arranged side by side in the same direction, and the cord reels are arranged closer to the corner of the electric carpet body than the electric board.

[0009]

According to the first aspect of the present invention, the temperature detecting means for detecting the temperature of the power cord, and the current flowing through the power cord by judging that the temperature of the power cord has risen to the abnormal temperature range based on the output of the temperature detecting means. When the temperature of the power cord wound on the cord reel rises to an abnormal temperature range, the current flowing through the power cord is suppressed to lower the temperature of the power cord. , Prevent the occurrence of short circuit accidents due to melting of the power cord. Also,
It lowers the temperature inside the control box and protects the circuit components mounted on the electrical board from high heat.

A second aspect of the present invention is a control box,
Since the heat shield wall is provided at the boundary between the electrical equipment board and the cord reel, the shield wall shields heat from the temperature rise of the power cord wound on the cord reel from reaching the electrical equipment board. Protects circuit components mounted on the board from high heat.

In a third aspect based on the second aspect, the control box has a substantially rectangular shape and is arranged at a corner of the electric carpet body, and the electric board and the cord reel are horizontally arranged in the control box. Since the cord reels are arranged side by side in the same direction, and the cord reels are arranged closer to the corners of the electric carpet body than the electric equipment substrate, an increase in the thickness of the control box can be suppressed and the control box can be made compact. Also, since the cord reel is located in the corner of the main body,
Make it easy to pull out the power cord.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 4, the electric carpet body (1)
Is formed by notching a corner of a rectangular carpet portion (2) and integrally mounting a rectangular control box (3) in that portion. As shown in FIGS. 1 and 2, a part of the control box (3) is a carpet part (2).
The upper and lower cases (4) and (5) that are engaged with each other are used for the exterior. The interior of the control box (3) is horizontally located between the first room (7) located on the corner side of the carpet body (1) and the second room (8) adjacent to it by the shielding wall (6). Compartments are formed in the direction. In the first room (7), a well-known cord reel (10) for winding the power cord (9) connected to the control box (3) so as to supply power to the carpet portion (2) is arranged, and its corner is arranged. The power cord (9) can be freely taken in and out from the outlet (11). A temperature detecting element (12) such as a negative characteristic thermistor is attached to the upper surface of the cord reel (10) so that the temperature of the power cord (9) can be indirectly detected. On the other hand, in the second room (8), an electrical equipment substrate (1
3) is arranged. A power-on / off knob (14) and a temperature setting knob (15) are attached to the electric component board (13) so that they are projected outward from the side surface of the control box (3) and inside the carpet section (2). The ends of the heater wire (16) and the temperature detection wire (17) arranged at are connected to each other. The boundary between the cord reel (10) and the electrical equipment substrate (13) is partitioned by the shielding wall (6), and the heat generated in the cord reel (10) is applied to the electrical equipment substrate (13).
However, the shield wall (6) is provided with a minimum necessary hole for passing the cord reel (10) and the lead wire connecting the temperature detecting element (12) and the electric component board (13). Is forming.

Next, the circuit configuration will be described with reference to FIG. In the figure, (17) is the temperature detection line,
A member whose impedance decreases as the temperature rises is arranged between the pair of electrodes. (18) is a first temperature detection circuit for detecting the temperature of the carpet section (2) by converting the impedance of the temperature detection line (17) into a voltage value,
(19) is a temperature setting circuit having a volume (VR) operated by the temperature setting knob (15).
Reference numeral (20) is a first comparator in which the output of the first temperature detection circuit (18) is connected to the inverting input terminal and the output of the temperature setting circuit (19) is connected to the non-inverting input terminal. The output of the first comparator (20) is connected to the heater control circuit (21) via the diode (D1). The heater control circuit (21) includes a transistor (Tr), a relay (RY), etc., and the output of the first comparator (20) is at H level (about +).
Transistor (Tr) in case of 5V) (hereinafter referred to as H)
To turn on the relay (RY) to drive the heater wire (1
6), and when the output of the first comparator (20) is L level (0V) (hereinafter referred to as L), the heater wire (16)
It is configured to cut off energization to.

Reference numeral (22) suppresses the current flowing through the power cord (9) by automatically switching the temperature set by the volume (VR) to the low temperature side when the temperature of the power cord (9) rises to an abnormal temperature. It is a current suppressing means. In this current suppressing means (22), (23) is a cord reel (1
The second temperature detection circuit provided with the temperature detection element (12) attached to (0), (24) is a temperature reference circuit for setting an abnormal temperature range of the power cord (9). The output voltage (A) of the temperature reference circuit (24) has a temperature corresponding to the temperature of the temperature detecting element (12) when the heat resistant temperature of the outer cover of the power cord (9) is 90 degrees. The output voltage (B) of the second temperature detection circuit (23) when it reaches is set to a value almost the same as or slightly lower than it. (25) is a second comparator in which the output of the second temperature detection circuit (23) is connected to the inverting input terminal and the output of the temperature reference circuit (24) is connected to the non-inverting input terminal. When the abnormal temperature rises, the second temperature detection circuit (2
When the output voltage (B) of 3) exceeds the reference voltage (A), the output is changed from H to L. The output terminal of the second comparator (25) is connected to the temperature setting circuit (19) through the series circuit of the resistor (R1) and the diode (D2), and the output of the second comparator (25) changes from H to H. When it becomes L, that is, when the temperature of the power cord (9) rises to the abnormal temperature range, the volume (VR) and the resistor (R1) are connected in parallel and the first
The voltage applied to the non-inverting input terminal of the comparator (20), that is, the set temperature is lowered.

Reference numeral (26) is a power switch which is opened and closed by a power on / off knob (14), and (27) is a DC power supply circuit for supplying a predetermined DC voltage to the current suppressing means (22) and the like.

Next, the operation of the above configuration will be described. First, when using a carpet, pull out the power cord (9) from the control box (3) for the required length, connect it to the power outlet, and turn on / off the knob (1
4) is operated to close the power switch (26). Also,
Operate the temperature setting knob (15) to set the desired temperature. Since the temperature of the carpet part (2) is lower than the set temperature at the beginning of energization, the output of the first comparator (20) maintains H, and the heater control circuit (21) connects the heater wire (16) to the heater wire based on the output. Energize. When the temperature of the carpet portion (2) rises and exceeds the set temperature due to the energization of the heater wire (16), the output of the first comparator (20) changes from H to L, and the heater control circuit (21) is output based on the output. ) Is the heater wire (1
6) Shut off the power supply to. Thereafter, this is repeated to maintain the temperature of the carpet portion (2) at the set temperature.

In such a usage state, a current continuously flows through the power cord (9). The power cord (9) itself generates a small amount of resistance and thus generates heat.
At this time, when the power cord (9) is pulled out from the cord reel (10) in a relatively large number, the temperature rise of the power cord (9) is small because it is cooled by the outside air, but the power cord (9) pulled out. ) Is short and a large amount of the power cord (9) remains on the cord reel (10) in the control box (3), the heat radiation amount of the power cord (9) is extremely reduced. As a result, if no special measures are taken, the temperature of the power cord (9) itself gradually rises to exceed the heat resistant temperature of the outer cover, causing a short circuit accident due to melting of the outer cover, or a cord reel ( 10), or the control box (3), the electrical equipment substrate (13), etc. may be subjected to thermal stress.

Therefore, in the present embodiment, the temperature of the power cord (9) is detected by the second temperature detecting circuit (23) using the temperature sensor (12) attached to the cord reel (10), and the detected temperature is The second comparator (25) determines whether or not the temperature set by the temperature reference circuit (24) has been exceeded. While the temperature of the power cord (9) is within the normal range,
The output of the second comparator (25) is held at H, and the above heating control is continuously performed. However, when the temperature of the power cord (9) rises abnormally and exceeds the temperature set by the temperature reference circuit (24), the second comparator (2)
The output of 5) changes from H to L, and a parallel circuit of the volume (VR) and the resistor (R1) is formed, and the temperature setting circuit (1
Since the output voltage of 9), that is, the set temperature decreases, the temperature of the carpet part (2) is set by the user to the volume (VR).
The temperature will drop below the set temperature. As a result, since the amount of current flowing through the power cord (9) is reduced and self-heating is suppressed, the temperature rise of the power cord (9) is suppressed, and a short circuit accident occurs due to melting of the outer cover of the power cord (9). It is possible to prevent and protect the components mounted on the electrical equipment substrate (13) from heat.

The optimum value of the set temperature lowering range when the abnormal temperature rises depends on the type of the electric carpet body (1), in particular, the wattage of the heater wire (16) and the shape of the control box (3). Then, the temperature setting circuit (19) and the resistor (R1) may be set appropriately so as to be experimentally obtained in advance. In addition, when the abnormal temperature is determined, the temperature setting can be set to the “off” state to cut off the power supply to the heater wire (16) and substantially stop the heat generation of the power cord (9). That is, in the case of the circuit of FIG. 3, when the output of the second comparator (25) becomes L due to the abnormal temperature determination, the temperature setting circuit (19) transfers to the first comparator (20) based on the output. The output is changed to the L state, and the first comparator (20) cuts off energization to the heater wire (16) regardless of the output of the first temperature detection circuit (18). May be performed. Also, the second
It is also possible to provide a notifying means for notifying that the temperature abnormality of the power cord (9) is generated by driving the lamp or the buzzer based on the L output of the comparator (25).

In this way, it is possible to prevent the power cord (9) from reaching an abnormal temperature, but if the power cord (9) is stored in the control box (3), the power cord (9) will be Since the temperature becomes considerably high, the temperature inside the control box (3) also rises, and unless special measures are taken, the temperature of the circuit components arranged in the control box (3) also rises. However, in the present embodiment, as described above, the inside of the control box (3) is divided into the first room (7) and the second room (8) adjacent to the first room (7) by the shielding wall (6) to form the first room (7). Room (7)
Since the cord reel (10) is arranged in the second room (8) and the electric equipment board (13) is arranged in the second room (8), the heat of the power cord (9) is applied to the electric equipment board (13) by the shielding wall (6). This can be prevented from reaching, and the thermal protection of the circuit components attached to the electrical board (13) can be achieved. Also, the first
Since the room (7) and the second room (8) are arranged in the horizontal direction, the control box (3) can be made thinner and the first box and the second room (8) can be made thinner than in the case where the both are vertically stacked. The heat generated in room (7) is transferred to the second room (8)
You can effectively dissipate heat without telling. In addition, the first room (7) in which the cord reel (10) is arranged
Since the cord outlet (11) is arranged in the corner of the carpet body (1), the power cord (9) can be easily pulled out.

The present invention is not limited to the above-mentioned embodiment, and modifications can be made without departing from the scope of the invention. For example, the main part of the circuit shown in FIG. 3 can be configured by a microcomputer.

[0022]

As described above, in the electric carpet in which the cord reel for winding the power cord is housed in the control box, the first invention is to detect the temperature of the power cord, and the temperature detecting means of the temperature detecting means. The temperature of the power cord wound on the cord reel is determined by the configuration that the current suppression means that suppresses the current flowing through the power cord by determining that the temperature of the power cord has risen to the abnormal temperature range based on the output is provided. When the temperature rises to an abnormal temperature range, the current flowing through the power cord is suppressed, the temperature of the power cord is lowered, and it is possible to prevent the occurrence of a short circuit accident due to melting of the power cord to improve safety and control It is possible to suppress the temperature rise in the box and protect the circuit components inside from the high heat to prevent the occurrence of circuit failure.

A second aspect of the present invention is a control box,
Since the heat shield wall is provided at the boundary between the electrical equipment board and the cord reel, the shield wall shields heat from the temperature rise of the power cord wound on the cord reel from reaching the electrical equipment board. The circuit component attached to the board can be protected from high heat to prevent the occurrence of circuit failure.

In a third aspect based on the second aspect, the control box has a substantially rectangular shape and is arranged at a corner of the electric carpet body, and the electric board and the cord reel are horizontally arranged in the control box. Since the cord reels are arranged side by side in the same direction, and the cord reels are arranged closer to the corners of the electric carpet body than the electric equipment substrate, the heat of the power cord housed in the control box can be effectively radiated. While you can
The thickness of the control box can be prevented from increasing, the control box can be made compact, and the cord reel is located at the corner of the main body, so that the power cord can be pulled out easily and the operability can be improved.

[Brief description of drawings]

FIG. 1 is a partial plan view of an electric carpet showing an embodiment of the present invention and showing a state where an upper case of a control box is removed.

FIG. 2 is a sectional view of a control box portion of the same embodiment.

FIG. 3 is a circuit diagram of the embodiment.

FIG. 4 is a plan view of the electric carpet body of the embodiment.

[Explanation of symbols]

 1 Electric Carpet Main Body 2 Carpet Part 3 Control Box 6 Shield Wall 9 Power Cord 10 Cord Reel 12 Temperature Detection Element 13 Electrical Board 16 Heater Wire 18 First Temperature Detection Circuit 22 Current Suppression Means 23 Second Temperature Detection Circuit

Claims (3)

[Claims] 1. A cord reel in which a control box accommodating an electrical equipment substrate having circuit parts mounted thereon is integrally provided in a part of an electric carpet body, and a power cord connected to the control box is wound around the control box. In the electric carpet housing the above, the temperature detection means for detecting the temperature of the power cord, and the output of the temperature detection means are used to determine that the temperature of the power cord has risen to an abnormal temperature range and flow to the power cord. An electric carpet provided with a current suppressing means for suppressing an electric current. 2. A cord reel in which a control box accommodating an electric equipment substrate having circuit parts mounted therein is integrally provided in a part of an electric carpet body, and a power cord connected to the control box is wound around the control box. In the electric carpet storing the above, a heat shield wall is provided in the control box at a boundary between the electric equipment substrate and the cord reel. 3. The control box has a substantially rectangular shape, is arranged at a corner of the electric carpet body, and the electric equipment substrate and the cord reel are horizontally arranged side by side in the control box and the cord reel is arranged. The electric carpet according to claim 2, wherein the electric carpet is arranged closer to a corner of the electric carpet body than the electric board.