JP2016065686A - Planar warmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar warmer having long life by preventing deterioration of a temperature-sensitive heater wire.SOLUTION: A planar warmer includes: temperature detection means 9 for detecting temperature of a plurality of temperature sensitive heater wires 7 disposed in each of a plurality of regions in a warmer body 11; temperature setting means 14; and temperature control means 12. The temperature control means 12 includes: partial heat insulation determination means 18 for determining a partial heat insulation form by the detection temperature of the other temperature-sensitive heater wire 7 when the detection temperature of one temperature-sensitive heater wire 7 out of the plurality of temperature-sensitive heater wires 7 has reached setting temperature, by comparison between a temperature detection signal of the temperature detection means 9 and a setting temperature signal of the temperature setting means 14; and region temperature automatic switching means 19 for automatically switching individual setting temperature of the plurality of temperature-sensitive heater wires 7 according to the determination result of the partial heat insulation determination means 18. Thus, the planar warmer can be provided in which a heat insulation form is determined and the setting temperature is switched to become low automatically by the region temperature automatic switching means 19 according to the determination result, and which has long life by preventing deterioration of the temperature-sensitive heater wire.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a planar warming tool that uses a temperature sensor integrated with a heater such as an electric carpet or an electric blanket.

  Conventionally, as shown in FIG. 11, this type of planar warming tool includes a planar warming tool body 50, and a one-line heater 51 that is a temperature-sensitive heater wire meanderingly disposed in the planar warming tool body 50. And a temperature control device 52 that controls energization to the one-wire heater 51 in accordance with a set temperature.

  As shown in FIG. 12, the one-wire heater 51 includes a core 53, a heater 54 wound around the peripheral surface of the core 53, and an internal covering the peripheral surface of the core 53 from above the heater 54. The coating 55 includes a detection line 56 wound around the circumferential surface of the inner coating 55, and an outer coating 57 that covers the circumferential surface of the inner coating 55 from above the detection line 56.

  The conventional temperature control device 52 performs the following temperature control.

  The detection line 56 housed in the one-wire heater 51 has a characteristic that its resistance increases when heated by the heater 54. Therefore, when the heater 54 is energized, a weak current is simultaneously applied to the detection line 56 and then the voltage across the detection line 56 is measured. Then, the heater 54 is turned on / off so that the measured voltage across the detection line 56 does not exceed the upper and lower limit values corresponding to the set temperature. That is, the detection line 56 is a temperature sensor that detects the temperature of the one-wire heater 51 by utilizing the fact that the resistance value (impedance) changes depending on the temperature.

  Specifically, when the voltage across the detection line 56 reaches the upper limit value, it is determined that the ambient temperature of the heater 54 has exceeded the set upper limit value of the heating temperature, and the heater driving means in the temperature control device 52 is determined. Thus, the energization to the heater 54 is stopped. In this state, the voltage of both ends is measured while energization of the detection line 56 is continued, and when the voltage at both ends reaches the lower limit value, the ambient temperature of the heater 54 falls below the lower limit value of the set heating temperature. Determination is made and the energization of the heater 54 is resumed.

  With such a control method, the heater 54 is energized and controlled to maintain the heating temperature of the planar warmer at a set temperature.

  However, in a conventional temperature control device for a surface warmer, when a heat insulating material such as a cushion is locally placed on the surface warmer, heat radiation from the portion where the heat insulating material is locally placed is prevented. As a result, the temperature rises abnormally, causing deterioration of the one-wire heater 51, which is a temperature-sensitive heater wire, and not only shortening the service life, but also causing a disconnection of the one-wire heater 51. .

  More specifically, when a heat insulating material such as a cushion is locally placed on the surface warmer, the resistance of the detection line 56 of the placed portion is relatively higher than the resistance of other regions. The total resistance of the detection line 56 is averaged with the resistance of the region not kept warm. Therefore, the voltage between both ends detected by the detection line 56 to measure the temperature is an averaged voltage of the heat retaining portion and the non-heat retaining portion, and it cannot be determined that the temperature is locally retained.

Further, as the room temperature becomes lower, the voltage detected by the detection line 56 to measure the temperature is closer to the voltage at the time of low temperature, so that the temperature is kept more locally and the temperature of the heat retaining portion is increased.

  For these reasons, when the energization time is long, when the room temperature is low, and in the state including both cases, the temperature of the heat retaining portion rises locally and causes deterioration of the one-wire heater 51 that is a temperature-sensitive heater wire. As a result, there is a possibility that not only will the service life be shortened, but the wire heater 51 may be broken.

  In order to solve the above-mentioned problems, a drive unit that energizes a heater to drive the heater, a temperature detection unit that detects a temperature of the heater, a temperature setting unit that sets a set temperature of the heater, and the temperature detection An electric carpet temperature control device comprising: control means for controlling the drive means so that the heater temperature becomes the set temperature based on the output of the means and the output of the temperature setting means. Measuring means for measuring time, and temperature setting changing means for shifting the set temperature of the heater to a new set temperature lower than the set temperature after the energization time measured by the measuring means has passed a predetermined time, And a room temperature detecting means for detecting the room temperature, and the set temperature is shifted to a new set temperature based on the output of the room temperature detecting means and the output of the temperature setting means. Determination means for determining whether or not each time elapses, the temperature setting change means is a new set temperature from the set temperature based on the output of the room temperature detection means and the output of the temperature setting means There has been proposed an electric carpet for setting the shift amount to (for example, see Patent Document 1).

JP-A-10-132304

  However, the detection wire of the one-line heater, which is a temperature-sensitive heater wire generally used in the conventional surface heating device, has an inner coating 55 between the heater 54 and the detection wire 56 mainly composed of polyamide. The heater 54 and the detection line 56 are configured as a temperature sensitive material, and a one-wire heater is configured with an inner coating 55 made of polyamide resin whose impedance changes depending on the temperature.

  However, since the inner coating 55 of the polyamide resin has a characteristic that it is affected by a change in impedance due to moisture absorption, there is a problem that the temperature rise characteristic is inferior when moisture is absorbed, in order to improve the temperature rise characteristic due to the moisture absorption. Control measures were taken. On the other hand, there is a configuration in which a nickel wire that is not affected by moisture absorption is used as a detection wire for a one-wire heater.

  A one-wire heater using this nickel wire as a detection wire can be made unaffected by moisture absorption, but has a resistance value change rate (impedance change rate) with respect to a temperature change that is extremely small. When this nickel wire is used as a detection line, when a heat insulating material such as a cushion is locally placed on the surface warming tool, the resistance of the placed detection line is relatively different from that of other areas. However, as the total resistance of the detection line, the resistance of the region not kept warm and the resistance change averaged are also extremely small. After the elapse of a predetermined time, until the heater set temperature is shifted to a new set temperature lower than the set temperature, the internal coating 55 serving as a temperature fuse reaches a high temperature that melts, and is a one-wire type that is a temperature-sensitive heater wire There was a problem that the deterioration of the heater could not be sufficiently prevented.

  The present invention solves the above-described conventional problems, and provides a long-life surface warming tool that can prevent deterioration of a temperature-sensitive heater wire regardless of whether the resistance change rate with respect to a temperature change of a detection wire to be used is low. The purpose is to provide.

A plurality of temperature sensitive heater wires arranged for each of a plurality of regions of the warming tool body;
Temperature detecting means for detecting the temperature of the temperature sensitive heater wire;
Temperature setting means for setting the temperature of the warming tool body to a desired temperature;
Temperature control means for controlling energization to the plurality of temperature-sensitive heater wires;
With
The temperature control means compares the temperature detection signal from the temperature detection means with the set temperature signal from the temperature setting means, and the detected temperature of any one of the plurality of temperature sensitive heater wires is a set temperature. A partial heat retention determining means for determining a partial heat retention form based on a detected temperature of another temperature sensitive heater wire when the temperature reaches the temperature, and individual set temperatures of the plurality of temperature sensitive heater wires according to the determination result of the partial heat retention determination means And a region temperature automatic switching means for automatically switching between.

  As a result, energization of the temperature-sensitive heater wire of the surface warmer is started, and detection of any one of the plurality of temperature-sensitive heater wires arranged for each of the plurality of regions of the warmer body is detected. When the temperature reaches the set temperature, the temperature of other temperature-sensitive heater wires is also confirmed, and the single area is partially warmed by a cushion or the like, or it is kept warm across multiple cushions. If the warming form such as whether or not any region is partially warmed by a cushion or the like is determined, and if the temperature sensitive heater wire is locally hot due to partial warming by the cushion or the like according to the determination result The discriminated area is switched so that the set temperature is automatically lowered by the area temperature automatic switching means, so that deterioration of the temperature-sensitive heater wire can be prevented and a long-life surface warmer can be provided.

  The planar warming tool of the present invention can prevent deterioration of the temperature-sensitive heater wire and provide a long-lived planar warming tool.

The block diagram which shows the structure of the control system of the planar warming tool in this Embodiment of this invention Configuration diagram of temperature-sensitive heater wire of the same surface heating tool Top view of the appearance of a coplanar warmer Plan view of a state example in which partial warming is performed in the same surface heating device Plan view of a state example in which partial warming is performed in the same surface heating device Plan view of a state example in which partial warming is performed in the same surface heating device Plan view of a state example in which partial warming is performed in the same surface heating device Plan view of a state example in which partial warming is performed in the same surface heating device It is a time chart which shows the detection line resistance value change in the partial heat insulation form example of the same surface warming tool, (a) is a time chart when a cushion is placed only in one area, (b) is a cushion covering two areas. (C) is a time chart when no cushion is placed. Flow chart showing the operation of the temperature control means of the coplanar warming tool Plan view of a conventional surface heating device Configuration diagram of a one-line heater of a conventional surface heating device

In the first invention, a plurality of temperature-sensitive heater wires disposed in a plurality of regions of the warming tool body, temperature detecting means for detecting the temperature of the temperature-sensitive heater wire, and a temperature of the warming tool body are desired. Temperature setting means for setting the temperature to a plurality of temperature-sensitive heater wires, and temperature control means for controlling energization to the plurality of temperature-sensitive heater wires, wherein the temperature control means includes a temperature detection signal from the temperature detection means and the temperature setting means. When the detected temperature of any one of the plurality of temperature-sensitive heater wires reaches the set temperature by comparing with the set temperature signal of A planar warming tool comprising: a partial heat retention determining means for determining; and a region temperature automatic switching means for automatically switching individual set temperatures of the plurality of temperature sensitive heater wires in accordance with a determination result of the partial heat retention determination means It is.

  As a result, energization of the temperature-sensitive heater wire of the surface warmer is started, and detection of any one of the plurality of temperature-sensitive heater wires arranged for each of the plurality of regions of the warmer body is detected. When the temperature reaches the set temperature, the temperature of other temperature-sensitive heater wires is also confirmed, and a single area is partially kept warm by a cushion or the like, or a cushion is stretched across multiple areas. If the warming form such as whether or not any region is partially warmed by a cushion or the like is determined, and if the temperature sensitive heater wire is locally hot due to partial warming by the cushion or the like according to the determination result The discriminated area is switched so that the set temperature is automatically lowered by the area temperature automatic switching means, so that deterioration of the temperature-sensitive heater wire can be prevented and a long-life surface warmer can be provided.

  According to a second aspect of the invention, in the first aspect of the invention, in the first aspect of the invention, the temperature control unit may be a resistor in which a resistance value of a temperature detection line of any one of the plurality of temperature sensitive heater wires corresponds to a set temperature. A partial heat retention determining means for determining a partial heat retention form based on a resistance value of a temperature detection line of another temperature sensitive heater wire when the value exceeds the value, and the plurality of temperature sensitive heaters according to a determination result of the partial heat retention determination means There is provided an area temperature automatic switching means for automatically switching off the resistance value of the temperature detection line which cuts off the energization of the line.

  As a result, the region where the temperature-sensitive heater wire is determined to be locally hot and the temperature-sensitive heater wire is determined to be locally high temperature is controlled so that the temperature-sensitive heater wire does not become too high by the region temperature automatic switching means. An off-resistance value of the detection line that cuts off energization is automatically switched, and a long-life surface heating tool that can prevent deterioration of the temperature-sensitive heater line can be provided.

  In a third aspect of the invention, particularly in the first or second aspect of the invention, the apparatus further comprises a controller that houses the temperature control means and is provided at an end of the planar warming tool body, and the plurality of temperature-sensitive heater wires include: It is a planar warming tool that is drawn and wired in at least two directions with respect to the controller. If the wiring interval of the temperature-sensitive heater wires drawn into the controller is narrower than the predetermined interval, the heat generation density increases. Therefore, in order to avoid that the temperature-sensitive heater wire temperature in the high-density part is too high, the predetermined interval or more is required. An interval is required. The plurality of temperature-sensitive heater wires are configured to be drawn and wired from at least two directions with respect to the controller, so that it is not necessary to increase the size of the controller and to ensure compactness.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a control system for a planar warming device in the present embodiment, and FIG. 2 is a configuration diagram of a temperature-sensitive heater wire of the planar warming device. FIG. 3 is a plan view of the appearance of the same surface heating device, which is not originally visible, but is shown so that the arrangement of the temperature-sensitive heater wire can be seen for convenience. 4 to 8 are plan views showing an example of a state in which partial warming is performed in the same surface warming tool, and FIG. 9 is a time chart showing a change in detection line resistance value in a partial warming configuration example of the same surface warming tool. 10 is a flowchart showing the operation of the temperature control means of the surface heating device.

As shown in FIG. 2, the temperature-sensitive heater wire 7 is composed mainly of a heating wire 1 wound in a spiral shape on the peripheral surface of the core 3 and nickel whose resistance value changes with a temperature change of the heating wire 1. The temperature detection line 2 is configured by sandwiching an inner coating 4 mainly composed of polyimide resin. The temperature detection line 2 is further covered with a vinyl chloride outer coating 5 and an adhesive layer 6 on the outer side thereof. As shown in FIG. 3, the temperature-sensitive heater wire 7 is wired to an electric carpet and a sheet heating device that is a simple floor heating device.

  As shown in FIG. 3, in the present embodiment, the planar warming tool 10 is divided into six regions, and temperature sensitive heater wires are arranged for each of the six regions. For convenience, the controller 8 side will be referred to as the A plane, the other as the B plane, and the six areas will be described as A-1, A-2, A-3, B-1, B-2, and B-3.

  Due to the heat generation of the heating wire 1 of the temperature-sensitive heater wire 7, the temperature of the temperature detection wire 2 adjacent to the heating wire 1 with the inner coating 4 interposed therebetween changes, and the resistance value of the temperature detection wire 2 changes. The resistance value of the temperature detection line 2 is taken as a temperature signal, and the temperature detection means 9 detects the temperature.

  Energization of the plurality of temperature-sensitive heater wires 7 provided for each of the plurality of regions (A-1, A-2, A-3, B-1, B-2, B-3) of the warming tool main body 11 is performed. The temperature control means 12 to be controlled is provided with a detection line resistance detection means 13 for detecting the resistance value of the temperature detection line 2 for each region.

  The temperature setting means 14 is instructed by the user to set a desired temperature using a variable resistor, push switch, or the like of the controller 8, and this temperature is input to the comparison means 15 as a set temperature signal.

  As the relay 17 is turned on by the temperature control means 12 and the heating wire 1 of the temperature-sensitive heater wire 7 is energized and the temperature rises, the resistance value of the temperature detection wire 2 increases.

  As the temperature of the temperature-sensitive heater wire 7 increases, the resistance value of the temperature detection wire 2 increases, and a plurality of temperature-sensitive heater wires are compared by comparing the temperature detection signal of the temperature detection means 9 and the set temperature signal of the temperature setting means 14. 7, when the detected temperature of one of the temperature-sensitive heater wires 7 reaches the upper limit value so as to be held in the range of the upper and lower limit values according to the set temperature, the temperature-sensitive heater wire 7 that has reached the upper limit value The relay 17 to be energized is turned off by the temperature control means 12, and the relay 17 is turned on when the detected temperature falls to the lower limit value. In this way, the temperature control means 12 performs on / off control of the temperature-sensitive heater wire 7 so as to be held in the range of the upper and lower limit values corresponding to the set temperature.

  The control by the temperature control means 12 in the planar warming tool of the present embodiment will be described in more detail.

  As described above with reference to FIG. 3, the planar warming tool 10 according to the present embodiment is called the controller A side as the A plane and the other as the B plane, and each of the A plane and the B plane is divided into three regions. . The controller 8 provided with the temperature control means 12 can select partial heating operation only on the A surface, partial heating operation only on the B surface, and full heating operation on both the A surface and B surface. Then, the temperature control means 12 individually controls energization of the temperature-sensitive heater wires 7 in the respective regions.

  Since the temperature control by the temperature control means 12 is the same in both the above-described full heating operation and partial heating operation, the case where the partial heating operation is performed only on the A surface will be described here.

  After the start of energization at S1 in the flowchart of FIG. 10 (Step 1 is described as S1, and thereafter Step S is also described as S), first, at S2, the detected temperature of the temperature sensitive heater wire 7 in the region A-1 is the set temperature. It is determined whether or not an OFF resistance (946Ω) corresponding to the upper limit value of the upper and lower limit values corresponding to the above has been reached.

If the area A-1 has not reached the OFF resistance (946Ω), the process proceeds to S8, and it is determined whether the area A-2 has reached the OFF resistance (946Ω), and the area A-2 has the OFF resistance (946).
If it has not reached (Ω), the process proceeds to S16 and it is determined whether or not the region A-3 has reached the OFF resistance (946Ω). If none of A-1, A-2, and A-3 has reached OFF resistance (946Ω) in S2, S8, and S16, energization is continued as it is for the temperature-sensitive heater wire 7 in any region.

  Thereafter, when the temperature-sensitive heater wire 7 in the region A-1 reaches the OFF resistance (946Ω), that is, when the set temperature is reached, the energization of the reached temperature-sensitive heater wire 7 in the region A-1 is turned off. At the same time, the process proceeds to S3, where it is determined whether the other regions A-2 and A-3 other than A-1 have also reached the OFF resistance (946Ω). In S3, if the areas A-2 and A-3 reach the OFF resistance (946Ω) as in A-1, no cushion is placed in any area as shown in FIG. It is determined that the temperature is not kept, and the process proceeds to S4, and the OFF resistance 946Ω for turning off the current is not changed and is continued as it is. P4 in the time chart shown as a change in the detection line resistance value when there is no cushion in FIG. 9C is the time when the OFF resistance (946Ω) is reached.

  Thus, when partial heat insulation is not performed, the detection line resistance value of the temperature-sensitive heater wire 7 (resistance value of the temperature detection line 2) is OFF resistance (946Ω) in the same manner for A-1, A-2, and A-3. At P4 when the temperature reaches P4, the energization of the temperature-sensitive heater wire 7 in any region is interrupted by the relay 17. When the energization is interrupted and the temperature drops, and the detected temperature of the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values according to the set temperature, the energization is performed again. By such on / off control to the temperature sensitive heater wire 7 (heating wire 1), the temperature is maintained at the set temperature.

  If it is determined in S3 of the flowchart of FIG. 10 that the areas A-2 and A-3 other than A-1 have not reached the OFF resistance (946Ω), the process proceeds to S5. In S5, it is determined whether the cushion is placed only in the area A-1 as shown in FIG. 4 or whether the cushion is placed across the areas A-1 and A-2 as shown in FIG. .

  That is, if the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-2 (resistance value of the temperature detection line 2) is equal to or less than a resistance value that is not partially retained by a cushion or the like, a so-called non-insulated resistance (935Ω), As shown in FIG. 4, it is determined that only the region A-1 is in a state of being kept warm as shown in FIG. 4, the process proceeds to S6, and the OFF resistance of the region A-1 is automatically switched from 946Ω to 874Ω.

  This is shown in the time chart of FIG. 9A (change in the detection line resistance value when there is a cushion in only one region).

  In other words, the temperature-sensitive heater wire 7 in the region A-1 is heated at the time point P2 when the temperature-sensitive heater wire 7 rises in temperature when energization starts and the temperature-sensitive heater wire 7 in the region A-1 reaches the first OFF resistance 946Ω. 7 is cut off, and it is determined that only the region A-1 as shown in FIG. 4 is partially warmed by a cushion or the like by the partial heat insulation determination means 18 of the temperature control means 12, and the region A-1 The OFF resistance is automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is interrupted at the time point P2, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values corresponding to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the region A-1 that is partially kept warm by a cushion or the like and is determined that the temperature-sensitive heater wire 7 is locally hot is automatically set by the region temperature automatic switching unit 19 of the temperature control unit 12. Therefore, the temperature of the partially warmed region can be appropriately maintained, the temperature sensitive heater wire can be prevented from being deteriorated, and a long-life surface warmer can be provided.

  In addition, in the determination in S5 of the flowchart of FIG. 10, the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-2 (resistance value of the temperature detection line 2) is a resistance value that is not partially heated by a cushion or the like, so-called heat retention. If it is not less than the resistance (935Ω), the process proceeds to S7. That is, as shown in FIG. 5, it is determined that the cushion is placed over the areas A-1 and A-2, and the area temperature automatic switching means 19 causes the OFF resistance of the areas A-1 and A-2. Is automatically switched from 946Ω to 874Ω.

  This is shown in the time chart of FIG. 9B (detection line resistance value change when a cushion is straddling two regions).

  In other words, the temperature-sensitive heater wire 7 in the region A-1 is heated at the time point P3 when the temperature-sensitive heater wire 7 is heated by the start of energization and the temperature-sensitive heater wire 7 in the region A-1 reaches the first OFF resistance 946Ω. 7 is cut off, and it is determined by the partial heat insulating determining means 18 of the temperature control means 12 that the cushion is placed over the areas A-1 and A-2 as shown in FIG. By the temperature automatic switching means 19, the OFF resistances of the regions A-1 and A-2 are automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is cut off at the time point P3, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values according to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the regions A-1 and A-2, which are partially kept warm by a cushion or the like and determined that the temperature-sensitive heater wire 7 is locally hot, are automatically detected by the region temperature automatic switching unit 19 of the temperature control unit 12. Thus, the temperature is switched so that the set temperature is lowered, and the temperature of the partially warmed region can be appropriately maintained, so that the temperature-sensitive heater wire can be prevented from being deteriorated and a long-life surface warmer can be provided.

  Moreover, in S8 of the flowchart of FIG. 10, the detection line resistance value (resistance value of the temperature detection line 2) of the temperature-sensitive heater wire 7 in the region A-2 among the regions A-1, A-2, and A-3 is When the OFF resistance (946Ω) is reached earliest, the process proceeds to S9.

  In S9, similarly to the determination described in S3, it is determined whether the regions A-1 and A-3 other than A-2 have also reached the OFF resistance (946Ω). Here, if the areas A-1 and A-3 also reach the OFF resistance (946Ω) as in A-2, as shown in FIG. It is determined that the temperature is not kept, and the process proceeds to S10, and the OFF resistance 946Ω that turns off the current is not changed and is continued as it is.

  If it is determined in S9 of the flowchart of FIG. 10 that the areas A-1 and A-3 other than A-2 have not reached the OFF resistance (946Ω), the process proceeds to S11. In S11, as shown in FIG. 5, it is determined whether or not the cushion is placed over the areas A-1 and A-2 or the other heat retaining mode.

  In S11, when the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-1 (resistance value of the temperature detection line 2) is not less than the resistance value that is not partially insulated by a cushion or the like, or a so-called non-insulated resistance (935Ω) If there is, the process proceeds to S14. That is, as shown in FIG. 5, it is determined that the cushion is placed over the areas A-1 and A-2, and the OFF resistance of the areas A-1 and A-2 is automatically switched from 946Ω to 874Ω. It is done.

  This is shown in the time chart of FIG. 9B (detection line resistance value change when a cushion is straddling two regions).

  That is, the temperature-sensitive heater wire 7 rises in temperature when energization starts, and at time P3 when the temperature-sensitive heater wire 7 in the region A-2 reaches the first OFF resistance 946Ω, the temperature-sensitive heater wire in the region A-2. 7 is cut off, and it is determined by the partial heat insulating determining means 18 of the temperature control means 12 that the cushion is placed over the areas A-1 and A-2 as shown in FIG. By the temperature automatic switching means 19, the OFF resistances of the regions A-1 and A-2 are automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is cut off at the time point P3, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values according to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the regions A-1 and A-2, which are partially kept warm by a cushion or the like and determined that the temperature-sensitive heater wire 7 is locally hot, are automatically detected by the region temperature automatic switching unit 19 of the temperature control unit 12. Thus, the temperature is switched so that the set temperature is lowered, and the temperature of the partially warmed region can be appropriately maintained, so that the temperature-sensitive heater wire can be prevented from being deteriorated and a long-life surface warmer can be provided.

  Further, in the determination in S11 of the flowchart of FIG. 10, the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-1 (resistance value of the temperature detection line 2) is a resistance value that is not partially insulated by a cushion or the like, so-called heat insulation. If it is less than the resistance (935Ω), the process proceeds to S12.

  In S12, whether the cushion is placed only in the region A-2 as shown in FIG. 6 or whether the cushion is placed across the regions A-2 and A-3 as shown in FIG. Determine.

  That is, if the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-3 (resistance value of the temperature detection line 2) is equal to or less than a resistance value that is not partially retained by a cushion or the like, a so-called unheated resistance (935Ω), As shown in FIG. 6, it is determined that only the region A-2 is in a state of being kept warm as shown in FIG. 6, and the process proceeds to S13, and the OFF resistance of the region A-2 is automatically switched from 946Ω to 874Ω.

  This is shown in the time chart of FIG. 9A (change in the detection line resistance value when there is a cushion in only one region).

  That is, the temperature-sensitive heater wire 7 rises in temperature by the start of energization, and the temperature-sensitive heater wire in the region A-2 reaches the time point P2 when the temperature-sensitive heater wire 7 in the region A-2 reaches the first OFF resistance 946Ω. 7 is cut off, and it is determined that only the region A-2 as shown in FIG. 6 is partially warmed by the cushion or the like by the partial heat insulation determination means 18 of the temperature control means 12, and the region A-2 The OFF resistance is automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is interrupted at the time point P2, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values corresponding to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the region A-2 that is partially kept warm by a cushion or the like and determined that the temperature-sensitive heater wire 7 is locally hot is automatically set by the region temperature automatic switching unit 19 of the temperature control unit 12. Therefore, the temperature of the partially warmed region can be appropriately maintained, the temperature sensitive heater wire can be prevented from being deteriorated, and a long-life surface warmer can be provided.

Further, in the determination in S12 of the flowchart of FIG. 10, the temperature-sensitive heater wire 7 in the region A-3.
If the detection line resistance value (resistance value of the temperature detection line 2) is not equal to or less than the resistance value that is not partially insulated by a cushion or the like, that is, the so-called non-insulated resistance (935Ω), the process proceeds to S15. That is, as shown in FIG. 7, it is determined that the cushion is placed across the regions A-2 and A-3, and the region temperature automatic switching means 19 causes the OFF resistance of the regions A-2 and A-3. Is automatically switched from 946Ω to 874Ω.

  This is shown in the time chart of FIG. 9B (detection line resistance value change when a cushion is straddling two regions).

  That is, the temperature-sensitive heater wire 7 rises in temperature when energization starts, and at time P3 when the temperature-sensitive heater wire 7 in the region A-2 reaches the first OFF resistance 946Ω, the temperature-sensitive heater wire in the region A-2. 7 is cut off, and it is determined by the partial heat insulating determining means 18 of the temperature control means 12 that the cushion is placed over the areas A-2 and A-3 as shown in FIG. By the temperature automatic switching means 19, the OFF resistances of the regions A-2 and A-3 are automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is cut off at the time point P3, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values according to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the regions A-2 and A-3, which are partially kept warm by a cushion or the like and determined that the temperature-sensitive heater wire 7 is locally hot, are automatically detected by the region temperature automatic switching unit 19 of the temperature control unit 12. Thus, the temperature is switched so that the set temperature is lowered, and the temperature of the partially warmed region can be appropriately maintained, so that the temperature-sensitive heater wire can be prevented from being deteriorated and a long-life surface warmer can be provided.

  Moreover, in S16 of the flowchart of FIG. 10, the detection line resistance value (resistance value of the temperature detection line 2) of the temperature-sensitive heater wire 7 in the region A-3 among the regions A-1, A-2, and A-3 is as follows. When the OFF resistance (946Ω) is reached earliest, the process proceeds to S17.

  In S17, similarly to the determination described in S3, it is determined whether the regions A-1 and A-2 other than A-3 have also reached the OFF resistance (946Ω). Here, if the areas A-1 and A-2 also reach the OFF resistance (946Ω) as in A-3, a state in which no cushion is placed in any area as shown in FIG. It is determined that the temperature is not maintained, and the process proceeds to S20, and the 946Ω of the OFF resistance for turning off the energization is continued without being changed.

  If it is determined in S17 of the flowchart of FIG. 10 that the areas A-1 and A-2 other than A-3 have not reached the OFF resistance (946Ω), the process proceeds to S18. In S18, it is determined whether the cushion is placed only in the area A-3 as shown in FIG. 8, or whether the cushion is placed across the areas A-2 and A-3 as shown in FIG. .

  That is, if the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-3 (resistance value of the temperature detection line 2) is equal to or less than a resistance value that is not partially retained by a cushion or the like, a so-called unheated resistance (935Ω), As shown in FIG. 8, it is determined that only the region A-3 is in a state of being kept warm as shown in FIG. 8, the process proceeds to S19, and the OFF resistance of the region A-3 is automatically switched from 946Ω to 874Ω.

  This is shown in the time chart of FIG. 9A (change in the detection line resistance value when there is a cushion in only one region).

That is, the temperature-sensitive heater wire 7 in the region A-3 is heated at the time point P2 when the temperature-sensitive heater wire 7 is heated by the start of energization and the temperature-sensitive heater wire 7 in the region A-3 reaches the first OFF resistance 946Ω. 7 is cut off, and it is determined that only the region A-3 as shown in FIG. 8 is partially warmed by a cushion or the like by the partial heat insulation determination means 18 of the temperature control means 12, and the region A-3 The OFF resistance is automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is interrupted at the time point P2, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values corresponding to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the region A-3, which is partially warmed by a cushion or the like and determined that the temperature-sensitive heater wire 7 is locally hot, is automatically set by the region temperature automatic switching unit 19 of the temperature control unit 12. Therefore, the temperature of the partially warmed region can be appropriately maintained, the temperature sensitive heater wire can be prevented from being deteriorated, and a long-life surface warmer can be provided.

  Further, in the determination in S18 of the flowchart of FIG. 10, the detection line resistance value of the temperature-sensitive heater wire 7 in the region A-2 (resistance value of the temperature detection line 2) is a resistance value that is not partially maintained by a cushion or the like, so-called heat retention. If it is not less than the resistance (935Ω), the process proceeds to S21. That is, as shown in FIG. 7, it is determined that the cushion is placed across the regions A-2 and A-3, and the region temperature automatic switching means 19 causes the OFF resistance of the regions A-2 and A-3. Is automatically switched from 946Ω to 874Ω.

  This is shown in the time chart of FIG. 9B (detection line resistance value change when a cushion is straddling two regions).

  That is, the temperature-sensitive heater wire 7 is heated at the start of energization, and the temperature-sensitive heater wire in the region A-3 is P3 when the temperature-sensitive heater wire 7 in the region A-3 reaches the first OFF resistance 946Ω in the region A-3. 7 is cut off, and it is determined by the partial heat insulating determining means 18 of the temperature control means 12 that the cushion is placed over the areas A-2 and A-3 as shown in FIG. By the temperature automatic switching means 19, the OFF resistances of the regions A-2 and A-3 are automatically switched from 946Ω to 874Ω.

  Therefore, after the energization is cut off at the time point P3, the temperature detected by the temperature-sensitive heater wire 7 becomes the ON resistance (855Ω) corresponding to the lower limit value of the upper and lower limit values according to the set temperature, and the temperature is increased again. From the second time on, the energization is turned off by the OFF resistance 874Ω as shown by the point P5.

  In this way, the regions A-2 and A-3, which are partially kept warm by a cushion or the like and determined that the temperature-sensitive heater wire 7 is locally hot, are automatically detected by the region temperature automatic switching unit 19 of the temperature control unit 12. Thus, the temperature is switched so that the set temperature is lowered, and the temperature of the partially warmed region can be appropriately maintained, so that the temperature-sensitive heater wire can be prevented from being deteriorated and a long-life surface warmer can be provided.

As described above, the planar warming tool 10 according to the present embodiment detects a plurality of temperature-sensitive heater wires 7 disposed for each of a plurality of regions of the warming-tool main body 11 and the temperature of the temperature-sensitive heater wire 7. A temperature detecting means 9; a temperature setting means 14 for setting the temperature of the warming tool main body 11 to a desired temperature; and a temperature control means 12 for controlling energization to the plurality of temperature sensitive heater wires 7. Reference numeral 12 denotes another when the temperature detected by any one of the plurality of temperature-sensitive heater wires 7 reaches the set temperature by comparing the temperature detection signal from the temperature detection means 9 with the set temperature signal 14. The partial heat retention determining means 18 for determining the partial heat retention form based on the detected temperature of the temperature sensitive heater wire 7, and the individual set temperatures of the plurality of temperature sensitive heater wires 7 according to the determination result of the partial heat retention determining means 18 are automatically performed. And a region temperature automatic switching means 19 for switching. As a result, energization is started to the temperature sensing heater wire 7 of the sheet heating device 10, and any one of the plurality of temperature sensing heater wires 7 arranged for each of the plurality of regions of the heating device body 11. When the detected temperature of the heater wire 7 reaches the set temperature, the temperature of the other temperature-sensitive heater wires 7 is also confirmed, and a single region is partially kept warm by a cushion or the like, or a cushion or the like in a plurality of regions Is kept warm, the warming form such as whether or not any region is partially warmed by a cushion, etc., is determined, and according to the determination result, the temperature is partially warmed by the cushion, etc. Is determined so that the set temperature is automatically lowered by the area temperature automatic switching means 19 to prevent the temperature-sensitive heater wire 7 from being deteriorated, and a long-life surface warmer is provided. Can be provided.

  In addition, the temperature control means 12 is configured so that the resistance value of the temperature detection line 2 of any one of the plurality of temperature sensitive heater wires 7 becomes equal to or higher than the resistance value corresponding to the set temperature. Depending on the resistance value of the temperature detection line 2 of the temperature sensitive heater wire 7, the partial heat retention determining means 18 for determining the partial heat retention form and the energization of the plurality of temperature sensitive heater wires 7 are cut off according to the determination result of the partial heat retention determining means 18. The region temperature automatic switching means 19 that automatically switches the off-resistance value of the temperature detection line 2 is provided, so that the region where the temperature-sensitive heater wire 7 is locally heated and locally determined to be hot is the region temperature. The automatic switching means 19 automatically switches off the resistance value of the temperature detection line 2 that cuts off the energization of the temperature-sensitive heater wire 7 so that the temperature-sensitive heater wire 7 does not become too hot, and the temperature-sensitive heater wire is deteriorated. Can prevent longevity It is possible to provide a planar Todan tool.

  In the present embodiment, specific numerical examples such as an OFF resistance of 946Ω, an OFF resistance of 874Ω, an ON resistance of 855Ω, and an uninsulated resistance of 935Ω have been described. However, the present invention is not limited to absolute values of these resistance values. Of course, these numbers are different depending on the material and specifications of the temperature-sensitive heater wire.

  In the present embodiment, an example in which a plurality of regions in which the temperature-sensitive heater wires are arranged is divided into six parts A-1, A-2, A-3, B-1, B-2, and B-3. Although described, it is not limited to this, for example, A-1, A-2, A-3, A-4, B-1, B-2, B-3, B-4, -1, A-2, A-3, B-1, B-2, B-3, C-1, C-2, C-3 may be used.

  Moreover, the planar warming tool 10 of this Embodiment accommodates the temperature control means 12, the controller 8 provided with the operation switch is provided in the edge part of the warming tool main body 11, and several temperature-sensitive heater wires Reference numeral 7 denotes a configuration in which wiring is drawn into the controller 8 from two directions. In the plan view of FIG. 3, with respect to the controller 8 provided at the lower left end of the warming tool main body 11, a plurality of temperature sensitive heater wires 7 are drawn and wired in two directions, the upper side and the right side. It is shown that there is.

  If the wiring interval of the temperature-sensitive heater wires 7 drawn into the controller 8 is narrower than the predetermined interval, the heat generation density increases. Therefore, in order to avoid that the temperature-sensitive heater wire temperature of the high density portion is too high. The above interval is necessary. However, the size of the controller 8 is increased by adopting a configuration in which a plurality of temperature-sensitive heater wires 7 are drawn and wired from two directions with respect to the controller 8 as in the planar warming tool 10 of the present embodiment. There is no need for compactness.

  As described above, the planar warming device according to the present invention can prevent deterioration of the temperature-sensitive heater wire and extend its life, so that it can also be used for thermal equipment including other temperature-sensitive heater wires. Applicable.

DESCRIPTION OF SYMBOLS 1 Exothermic line 2 Temperature detection line 3 Winding core 4 Inner coating 5 Outer coating 7 Temperature-sensitive heater wire 8 Controller 10 Surface heating device 11 Heating device body 12 Temperature control means 13 Detection line resistance detection means 14 Temperature setting means 15 Comparison means 18 Partial heat retention discriminating means 19 Area temperature automatic switching means

Claims (3)

A plurality of temperature sensitive heater wires arranged for each of a plurality of regions of the warming tool body;
Temperature detecting means for detecting the temperature of the temperature sensitive heater wire;
Temperature setting means for setting the temperature of the warming tool body to a desired temperature;
Temperature control means for controlling energization to the plurality of temperature-sensitive heater wires;
With
The temperature control means compares the temperature detection signal from the temperature detection means with the set temperature signal from the temperature setting means, and the detected temperature of any one of the plurality of temperature sensitive heater wires is a set temperature. A partial heat retention determining means for determining a partial heat retention form based on a detected temperature of another temperature sensitive heater wire when the temperature reaches the temperature, and individual set temperatures of the plurality of temperature sensitive heater wires according to the determination result of the partial heat retention determination means An area temperature automatic switching means for automatically switching between and a surface heating device.   The temperature control means includes another temperature-sensitive heater wire when a resistance value of a temperature detection line of any one of the plurality of temperature-sensitive heater wires is equal to or higher than a resistance value corresponding to a set temperature. A partial heat retention determination means for determining a partial heat retention form based on a resistance value of the temperature detection line, and an off-resistance value of the temperature detection line for cutting off the energization of the plurality of temperature sensitive heater wires according to the determination result of the partial heat retention determination means The area warmer according to claim 1, further comprising a region temperature automatic switching means for automatically switching between the two.   The structure according to claim 1, further comprising a case that houses the temperature control means and is provided at an end of the planar warming tool body, wherein the plurality of temperature-sensitive heater wires are drawn into and wired from at least two directions with respect to the case. The planar warming tool according to 1 or 2.

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