JP2007032891A - Warm bath type kotatsu built into floor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Kotatsu built into a floor having a heating effect (a feeling like a warm bath) by heating at a much lower temperature than a conventional electric heating type Kotatsu. <P>SOLUTION: In this warm bath type Kotatsu built into the floor, a bottom planer heater 7 made of thermoplastic resin, and a heat storage material 8 are laminated and arranged on a bottom plate part 5 of a furnace case 3, and a sidewall planer heater 7a made of thermoplastic resin is provided at a sidewall part 4 of the furnace case 3. Both planer heaters are controlled in temperature to generate heat at 50°C or less. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot-bath digging kotatsu by electric heating, and provides an electric-drilling digging that provides a heating effect similar to that of a hot bath by conducting heat to the body mainly by radiant heat energy while being low-temperature heating. To do.

  Kotatsu using charcoal currently has major safety issues such as difficulty in securing charcoal and adjusting the amount of heat generated, as well as the risk of combustion gas generation and the risk of burns and fire. On the other hand, the heating lamp type is easy to turn on / off and adjust the amount of heat generation and is clean and safe. Such characteristics are common to the electric heating type.

  There is a digging kotatsu as a full-fledged and fixed kotatsu, but now this kotatsu is popular as a local heating method in buildings where you can enjoy a calm atmosphere such as a hot spring resort inn, a cold villa or a luxury restaurant . However, this digging kotatsu is worth using when there are people who take care of the fire, such as a housemaid like an inn. However, since there is usually no one who takes care of the fire, an electric heating type is often used instead of charcoal fire.

  Various types of electric heating type drills have been proposed as follows.

  1) A heat storage type digging kotatsu that uses a sheathed heater at the bottom of the digging kotatsu and a heat storage plate around it to store heat by cheap power during the midnight power rate time period and dissipate it during the daytime. 1 (heat storage / convection heat transfer type).

  2) A direct leg heating type drill that uses a leg stand that incorporates an electric heater to hold the user's leg at an arbitrary angle and directly warm the leg when using the drill. Is described in Patent Document 2 (Leg Contact Heat Transfer Type).

  3) A heating unit is provided on almost the entire bottom surface and inner surface of the furnace box, and a heating unit is provided up to the lower surface of the top plate of the table placed above the furnace box to increase the heating capacity. A type of drilling kotatsu is described in Patent Document 3 (entire heating type).

  4) A backrest heating type digging in which a digging kotatsu and a stool that surrounds it are formed one step below the floor of the room, and a heating element is disposed on the stool of the stool. Kotatsu is described in Patent Document 4 (lumbar heat transfer heating type).

5) A bottom surface heater is provided on the inner bottom surface of the digging kotatsu main body, and a side surface heater is also provided on the inner surface, and the temperature of the side surface heater is set higher than the temperature of the bottom surface heater. The drilling kotatsu made to do is described in patent document 5 (high temperature heating type of leg part).
JP-A-6-265160 JP-A-7-113524 Japanese Patent Laid-Open No. 9-79580 Japanese Patent Laid-Open No. 9-229378 Japanese Patent No. 3206352

(Evaluation of invention described in patent document)
Patent Document 1 describes a structure of a heating device for a digging kotatsu, and collects four heat storage plates that incorporate magnesium oxide in a heat storage plate that constitutes a main part of the heating device, thereby obtaining an aggregate of the heat storage plates. The heat generating part is formed by incorporating a sheathed heater in the concave part formed in the central part. And this heat generating part is accommodated in the inside of the box using a heat insulating plate, a heat storage plate is supported on the bottom plate, and heated air is supplied from the bottom of the box through a heat radiation fin arranged on the bottom surface of the bottom plate. Is discharged and circulated in the kotatsu to heat the kotatsu.

  This kotatsu is to store solid heat storage material as sensible heat, and in order to store a sufficient amount of heat in this heat storage plate, it is necessary to use a large volume, and a large and expensive device. There are disadvantages. In addition, the heating effect is inferior because the convection heat transfer method is adopted in which the air in the kotatsu is heated and circulated in the kotatsu via the heat radiation fin below the heating device to heat the kotatsu. Even when using nighttime electricity, the amount of heat stored is small, and the electricity bill has to be expensive.

  In Patent Document 2, a heater is built in a plate-shaped leg platform and a leg is placed directly on the heater to heat it. The heat of this leg platform is directly behind the leg. Therefore, a large temperature difference occurs between the front and back of the leg, which impedes the blood circulation of the leg and has a medical problem.

  In Patent Document 3, heating portions are provided on the bottom surface and the peripheral wall surface of the kotatsu, and further on the six surfaces of the lower surface of the top plate portion of the table. Since this kotatsu can warm the whole inside by convection heat transfer or radiant heat transfer, there is a possibility that the temperature inside the furnace box can be made uniform without using a hanging rack. . However, since this drilling kotatsu needs to provide a large number of heaters up to the table, the electrical equipment becomes complicated and the equipment costs increase, and the heating costs are high.

  In Patent Document 4, a seating surface and a backrest surface are formed around a kotatsu main body located one step below the floor surface, and a heating element is also provided on the backrest surface. However, this digging kotatsu is a large-sized device, and its installation area is greatly increased, so that it is difficult to install in general houses.

  In Patent Document 5, planar heaters are arranged on the bottom surface and the peripheral surface of the kotatsu main body, but when viewed in the embodiment, the heater wires are meandered and arranged to generate heat in a planar shape. . This heater heats the inside of the kotatsu body that heated the air and generated convection, and although it may have improved thermal efficiency compared to conventional electric drilling kotatsu, it has a warm bath effect like a footbath In other words, there is no description about a heating method or a heating effect that gently and comfortably heats the leg at a low temperature and distributes this heating throughout the body.

(Heating temperature of digging kotatsu)
As described above, the digging kotatsu has an electric heater at the bottom of the furnace box, or has an electric heater on the back of the table top, or the bottom of the furnace box and the table top of the table In general, an electric heater is provided on both of the backsides. Moreover, nichrome wire heaters or heat lamps are used as heat sources for this.

  The heat generation temperature using these electric heaters and heaters as heat sources generally generates heat at a high temperature of about 135 ° C. to 150 ° C. Therefore, the heat receiving surfaces such as the furnace box and the table are always burned at a high temperature. There is a defect that the wood itself deteriorates or the coating of the kotatsu member deteriorates. Moreover, the temperature in the kotatsu using such an electric heater etc. is heated to a high temperature of about 70 ° C. to 90 ° C. Therefore, if you put your legs and knees in this kotatsu and heat them up, you will receive radiant heat while touching the heated air that is considerably higher than your body temperature, and you will receive a hot feeling such as tingling and tingling in a short time. Many infants and elderly people need to be careful when warming.

  Certainly, when a body cooled by the outside air is warmed in a hot kotatsu, it will initially feel a warmer sensation than a rapid heat receiving such as hot air. However, when the skin gets warm to some extent, the heating becomes more than necessary, and the skin facing the electric heater is heated locally, and eventually it is too hot and the user feels uncomfortable.

  For example, if you look at a meeting for a long time surrounding the kotatsu, if your knees are exposed to the above high temperature from the legs, your body will receive more heat than necessary, and in some cases the lower body will burn You will not be able to talk, and in many cases you will be sleepy.

  Therefore, for example, when the temperature of the electric heater is adjusted to a low temperature of about 45 ° C., it takes time to warm the leg from the tip of the leg, and the warmth cannot be felt substantially. Therefore, there are few scenes where the temperature is actually used, and usually it has to be controlled to a high temperature as described above.

(New attempt)
Therefore, the present inventors can sufficiently warm the sheet heater even at a low temperature of about 50 ° C. or less to about 40 ° C., preferably close to the body temperature, and further, use according to the low temperature. The following experiment was conducted with the aim of obtaining less than about half the amount of electric power compared to the conventional drilling kotatsu.

A. What part of the body feels warmth, whether there is a means to sufficiently heat that part even at low temperatures, and whether high-temperature heating is necessary as in the past b. If the temperature is low, how low can the temperature be lowered and can be put to practical use? The following requirements can be considered as a method of receiving heat from the heat source.
a. Convection heat transfer using heated air as a medium, b. Contact heat conduction between the heated part and the body,
c. Single heating of radiant heat conduction, d. Combined use of radiant heat conduction and contact heat conduction.

(Use of low-temperature exothermic surface heater)
Drilling kotatsu model: As shown in FIGS. 1 and 2, a furnace box 3 having an inner surface dimension (vertical / horizontal) of 1200 × 860 mm and a depth of 400 mm was prepared. Then, on the upper surface of the bottom plate portion 5 of the furnace box 3, two “low temperature heating type” bottom surface heaters 7 having a width of 235 mm and a length of 1130 mm are laid, and further, a width of 195 mm and a length of 1970 mm. Two low-temperature exothermic “side wall surface heaters 7a” were prepared and provided along the two side wall surfaces in an L-shaped state. These planar heaters 7 and 7a were wired as shown in FIG.

  As will be described later, the planar heaters 7 and 7a are mainly composed of a thermoplastic resin, and are formed by adding fine carbon powder to the thermoplastic resin. The planar heaters 7 and 7a are suitable for high-temperature heating because they heat the thermoplastic resin. Absent. Moreover, in this example, it experimented without laminating | stacking the thermal storage material 8 on the upper surface of the bottom part planar heater 7. FIG.

(Regarding low-temperature exothermic surface heaters 7 and 7a)
As the low-temperature heating type planar heaters 7 and 7a, the product name “Plaheat” manufactured and sold by Misato Co., Ltd., one of the present applicants, was used. This heater is made of thermoplastic resin as the main raw material. About 20% of fine carbon powder is added to thermoplastic resin mainly composed of polyethylene, polypropylene, nylon, etc. to produce pellets, and the pellets are extruded. Two sheets with a thickness of 1 mm from the T-die are simultaneously formed in parallel to the top and bottom, and the electrode wires are placed in parallel on both sides of the sheet, while pressing and adhering in a softened state to form a continuous belt The planar heater was manufactured.

  This low-temperature heating type planar heater 30 (generic name for the heaters 7 and 7a) is a sheet-like (strip-like) shape in which electrode wires 32 and 33 are arranged on both sides of the heater element 31 as shown in FIGS. This is housed and sealed in a heat-resistant and electrically insulating cover 33, and an electric wire 35 is led out from one end.

  As shown in FIG. 8, the planar heater 30 has a resistance value that increases as the temperature rises. The resistance value increases rapidly from 40 ° C. to 50 ° C., and the current is rapidly limited along with the temperature state. It has a so-called “PTC effect”. Further, since this planar heater is made of a thermoplastic resin such as polyethylene or polypropylene, it is not suitable for high-temperature heat generation, and is suitable for generating heat at a temperature of about 50 ° C to 40 ° C. In addition, the curves A, B, C, and D shown in FIG. 8 show examples having electric capacities of 30, 40, 50, and 60 W / m, respectively.

(Surface heater safety)
The planar heater 30 is manufactured under special conditions. In the cross section, the fine powder layer c of carbon is unevenly distributed on the surface, and only the surface forms a thin conductive layer. Electrical insulation that does not flow. By energization, current flows in the width direction of the heater portion between the electrodes 31 and 32 on both sides of the heater element 31 to generate heat. Note that there is a characteristic that even if a hole is made in the heater portion, the heat generation effect of other portions is not affected.

  In such a state, for example, if one of the wires touches the energized heater portion for some reason and a short circuit occurs, a spark occurs in the small area of the heater portion that the wire contacts, and that portion is instantaneously Melts to form small holes around the wire. In this perforated state, the energization between the heat generating layer and the electric wire is automatically cut off. In other words, this low-temperature heating type planar heater has “self-current interruption” in the event of a short-circuit accident.

(Heating effect experiment)
First experiment (power consumption of the entire kotatsu)
The bottom surface sheet heater 7 and the side surface sheet heater 7a using the low temperature heating type heater element are wired as shown in FIG. 4, and a voltage of 100V is fed to them to excavate. The state of temperature rise in 1 and changes in inrush current and stable current were measured.

  The inrush current at a room temperature of 18 ° C. was 3.2 A, but decreased to 2.9 A after 5 minutes, decreased to 2.8 A after 10 minutes, decreased to 2.6 A after 20 minutes, and thereafter Is stable. Therefore, the power consumption of the digging kotatsu 20 minutes after the switch was turned on was 260 W. In addition, the power consumption of the conventional digging kotatsu of this size is about 1500 to 3000 W, and the power consumption of the digging kotatsu using the low-temperature heating type planar heater is compared with the conventional one. It can be seen that it is extremely low.

Second experiment (searching for a place where the body feels heated)
Using the excavation kotatsu 1, 14 men, 7 men and 7 women, conducted the following experiment to evaluate the heating method of the excavation kotatsu.

  (Experiment a) The energization of the side wall surface heater 7a is stopped, only the bottom surface heater 7 is heated, and the degree of warmth when the sole part is directly brought into contact with this for about 20 minutes is evaluated. The temperature of the bottom planar heater 7 is controlled at 45 ° C. In this case, the average temperature in the kotatsu was 35 to 36 ° C. (sole, direct, heat conduction heating).

  (Experiment b) A sheet-like heat storage material 8 filled with a latent heat storage material is placed on the bottom surface heater 7, heated to a state in which the heat storage material 8 is melted, and directly on the heat storage material 8 Evaluate the feeling of warmth when the sole part is contacted for about 20 minutes. In this case, the average temperature in the kotatsu was 35 to 36 ° C. The heat storage material had a melting temperature of 31 ° C. and a solidification temperature of 28 ° C. (foot / heat storage material contact heating).

  (Experiment c) Both the side surface heater 7a and the bottom surface heater 7 are heated. Then, the sole is brought into contact with the bottom surface heater 7 and the ankle portion is kept 20-20 cm away from the side wall surface heater 7a, and the feeling of warmth is evaluated in that state for about 20 minutes. To do. In this case, the average temperature in the kotatsu was 35 to 36 ° C. (the sole direct heat conduction heating and the heel radiation heating).

  (Experiment d) An aluminum plate is disposed on the surface of the side wall surface heater 7a, and heat is radiated into the kotatsu via the aluminum plate, and the bottom surface heater 7 is energized to install the double-sided heaters 7 and 7a. While generating heat, the feeling of warmth is evaluated for about 20 minutes in the same posture as in (Experiment c). In this case, the average temperature in the kotatsu was 35 to 36 ° C. The aluminum plate is a heat radiating plate and also functions as a heat reflecting mirror due to the gloss of the surface (direct heat conduction heating and radiant heating).

(Experiment e) Observation Using Infrared Thermography The temperature distribution state by infrared thermography when the legs in the experiments a to d were heated was observed. For comparison, the legs were heated using a conventional high-temperature exothermic digging kotatsu and observed by infrared thermography as described above (reference experiment).

  As a result, in the experiment a, the temperature of the sole increased rapidly, but it took about 20 minutes or more to be heated to the legs. Experiment b took more time to heat the legs than experiment a.

  In experiment c, the temperature of the legs increased considerably while being low-temperature heating. Furthermore, experiment d confirmed that the temperature of the legs was increased quickly and that the temperature increase was transmitted to the lower body quickly. It was also confirmed that the body temperature rose considerably rapidly due to low-temperature heating of the legs, particularly heating of the legs using radiant energy.

  In addition, in the case of the conventional high-temperature heating type drilling kotatsu, the temperature rise of the entire foot and the surface of the leg was remarkable, but the temperature in the kotatsu was quite high, so the leg from the kotatsu Operation such as taking out or moving in a kotatsu is necessary, and there was a problem in using for a long time.

(Experimental considerations)
From the experimental result of the first power consumption, in the case of the digging kotatsu using the low-temperature heating type planar heater, the power consumption is extremely reduced as compared with the conventional high-temperature heating type digging kotatsu. Was confirmed. This is because it is an effect of cryogenic heating manufactured using a thermoplastic resin having a PTC effect as a main raw material.

  From the second human body kotatsu heating experiment, many people felt that the sole, direct, and heat conduction heating in (Experiment a) did not feel warm or received heat insufficiently.

  Further, in the case of (experiment b), the contact / heat storage material contact heating, as in the case of (experiment a), there were many people who did not feel much warmth. From these experiments, it was evaluated that low-temperature heating only on the soles is insufficient for heating kotatsu.

  Next, in the case of combined heating in which heat is directly transferred to the sole of (experiment c) and heating by radiant heat is further applied to the heel, the average temperature in the kotatsu is 35 to 36 ° C. and below the body temperature ( In spite of the low temperature heating, we could feel sweating over 10 to 15 minutes and a comfortable heating effect that we have never experienced with conventional kotatsu ).

  Furthermore, according to the kotatsu heating effect in the case where the side wall heater and the reflector in (Experiment d) are used in combination, there is sweating in a time of about 10 to 15 minutes, and more than in the case of (Experiment c). I could feel the comfortable heating effect that I had never experienced before. Although the temperature in the kotatsu was as low as about 35 or 36 ° C. as described above, the entire leg became warm, and this was transmitted from the lower body to the entire body and felt a comfortable warmth.

  And in the case of this kotatsu according to the present invention, compared with the conventional kotatsu, even though it is heating by a planar heater mainly made of a cryogenic synthetic resin, even if it comes out of the kotatsu, the flame of the leg is lit. However, it continued for about 30 minutes, and it felt as if the legs had become lighter (an eyelid / far infrared heating effect).

  The object of the present invention is to provide a digging kotatsu that eliminates the problems of the prior art from the characteristics of the digging kotatsu using low-temperature heating.

  In order to achieve the above object, the excavation kotatsu according to the present invention is configured as follows.

  1) A bottom surface heater made of a thermoplastic resin and a heat storage material are laminated on a bottom plate portion of the furnace box, and a side wall surface heater made of a thermoplastic resin is provided on the side wall portion of the furnace box. Is characterized in that the temperature is controlled so as to generate heat at a temperature of 50 ° C. or lower.

  2) A bottom surface heater made of a thermoplastic resin and a heat storage material are laminated on the bottom plate portion of the furnace box, and a side wall surface heater made of a thermoplastic resin is provided on the side wall of the furnace box. The surface of the heater is covered with a metal heat radiating plate, and the temperature of the double-sided heater is controlled so as to generate heat at a temperature of 50 ° C. or less.

  3) The sheet heater made of a thermoplastic resin is characterized in that a mixture of a thermoplastic resin and carbon is extruded and has a PTC characteristic.

  4) The metal heat dissipating plate disposed on the surface of the side wall surface heater is such that a titanium oxide ceramic layer and an aluminum oxide ceramic layer are formed in a double structure from the side closer to the side wall surface heater. It is a feature.

  5) The surface of the side wall heater is coated with a reflective metal heat radiating plate, and radiant heat energy is radiated through the heat radiating plate, and radiant heat energy is reflected to fill the furnace box with the radiant heat energy. Further, the present invention is characterized in that the object to be heated contained in the furnace box is efficiently heated by applying radiant heat energy.

  The digging kotatsu according to the present invention uses a low-temperature heating type planar heater extruded using a thermoplastic resin, heat transfer heating to the sole, radiant heat heating to the heel, and leg Due to the far-infrared heating of the entire body, the inside of the kotatsu has an effect of driving heat energy into the legs despite the fact that the temperature in the kotatsu is about the body temperature, and it is possible to realize comfortable kotatsu heating.

  Therefore, unlike conventional high-temperature heating type electrothermal drilling kotsutsu of 100 ° C. or more, it does not receive heat that is tingling and irritating. There is no feeling at all. Therefore, it is possible to perform a meeting or a meeting surrounding the kotatsu comfortably and for a long time.

  In particular, when compared with the drilling kotatsu according to the present invention and the conventional high-temperature heating type drilling kotatsu, it is understood that the uniformity of temperature rise is further improved by observation of the heating state of the legs and lower body by infrared thermography. .

  In the present invention, an excellent heating effect and a soft heating effect can be obtained even at a low temperature of 40 ° C. or less and about 35 to 36 ° C. Therefore, this is compared with the case where a warm bath (footbath) is immersed in a warm bath type. Called.

  Next, an embodiment of a warm bath type digging kotatsu according to the present invention will be described with reference to the drawings.

  FIG. 1A is a front sectional view of a digging kotatsu, and FIG. 1B is a sectional view showing another form of the side wall.

  The excavation kotatsu 1 according to the present invention is configured to be installed in a recess in which a floor surface 2 is dug down. For example, the side walls 4a to 4d (4) made of a heat insulating plate having a thickness of 15 mm and An assembled box-like furnace box 3 having an open top is formed by a bottom plate portion 5 made of a similar heat insulating plate.

  A bottom surface heater 7 and a heat storage material 8 in which a latent heat type heat storage material is packed in a thin plate shape are laid on the upper surface of the bottom plate portion 5 to form a bottom surface heating portion H, and a crosspiece 9 is laid thereon. Has been. The crosspiece 9 can be changed to a felt-shaped rug 9a in order to improve the feel of the foot.

  A concave portion 11 is formed on the inner surface of the side wall portion 4 provided above the heat generating portion H, and a side wall heat generating portion Ha including a side wall surface heater 7a is provided therein. FIG. 1B is a cross-sectional view showing an example of the side wall heat generating portion Ha, and a surface treatment sheet 12 such as an insulating sheet or a flocking cloth or a carpet is attached to the surface of the concave portion 11 formed in the side wall portion 4c. Yes. And the side wall heater 7a is inserted in the said recessed part 11, and the heat sink 13 which consists of an aluminum plate (The reflecting plate made from a metal plate, the surface should have glossiness like a mirror) is provided on this. . The heat radiating plate 13 supports the side surface heater 7a and has a property of converting the amount of heat generated from the heater into radiant energy.

  The sheet heaters 7 and 7a are designed based on the product name “Plaheat” manufactured by Misato Co., Ltd. as a basic structure, and are a low-temperature heating type in which a mixture of a thermoplastic resin and carbon is extruded. However, the one with the large radiation effect of far infrared rays is used.

  And as a heat storage body, for example, it is described in Patent No. 2929418, “water, anhydrous sodium sulfate, calcium sulfate dihydrate, sodium borate decahydrate, water glass and hydrochloric acid, Use a heat storage composition in which the blending amount of calcium sulfate dihydrate is 0.1 to 2.9% by weight and the blending amount of sulfuric acid is 0.1 to 10% by weight in terms of 35% hydrochloric acid. Can do.

  FIG. 2 shows an embodiment in which a concave portion for accommodating a planar heater is not formed in the side wall portion 4a. The side wall planar heater 7a is covered and fixed by a heat radiating plate 13 made of an aluminum plate. The back surface of the heat radiating plate 13 faces the heater 7a. On this heat receiving surface, as shown in FIG. 2B, a ceramic layer 13b made of titanium oxide / a ceramic layer 13a made of aluminum oxide is laminated in a double layer. A ceramic layer for smooth heat transfer is formed.

  In addition, about making this ceramic layer into two layers, and the order of the layer were obtained by many years experiment of this invention, there exists a fixed law in the lamination | stacking order of the layer. That is, in the distribution diagram of radiation intensity and wavelength, a ceramic layer having a short wavelength corresponding to the maximum intensity is provided on the heat receiving surface side (heat source side), and a ceramic layer having a wavelength longer than the wavelength is provided on the surface of the heat sink. Will be placed on the side. There is a finding that if the ceramic layers are laminated in this order, the amount of heat radiation is considerably increased (about 10 to 20%) as compared with the heat radiation from a planar heater without a heat sink.

  As an example of the arrangement of the bottom surface heater 7 and the side wall heater 7a, as shown in FIG. 3, two sheets are juxtaposed on the bottom plate 5, and two sheet heaters 7a are provided on the inner surfaces of the side walls 4a to 4d. It arrange | positions in the recessed part 11 in the state bent to L shape. Therefore, two sheet heaters 7 are used on the upper surface of the bottom plate part 5, and two sheet heaters 7a are used on the inner surfaces of the side walls 4a to 4d.

  In the present invention, as shown in FIG. 2 (A), the sheet heater 8 is laid on the upper surface of the sheet heater 7 laid on the bottom plate portion 5, and the heat generated by the sheet heater 7 is stored in the heat storage. Heat is radiated into the digging cot 1 through the material 8. On the other hand, the planar heater 7a provided on the inner surfaces of the side wall portions 4a to 4d is efficient in the kotatsu 1 through the heat sink 13 made of an aluminum plate as shown in FIGS. 1 (B) and 2 (A). Heat radiation.

  FIG. 4 shows a wiring diagram of the digging kotatsu. The control device 15 is connected to the two bottom heaters 7 and the wires 16 and 16a connected to the electrodes of the two side wall heaters 7a. ing. Although not shown, a thermal fuse and a temperature sensor are connected to each of the sheet heaters 7 and 7a so as to generate heat at a predetermined temperature, that is, a low temperature of 45 to 50 ° C.

  FIG. 5 is a side sectional view showing an example of the digging kotatsu 1, in which a heat insulating box 18 is supported in a hole formed by cutting the floor surface 2, and the furnace box 3 having the above-described configuration is provided in the heat insulating box 18. In this state, the heaters provided in the furnace box 3 are wired as shown in FIG. A table 19 is provided above the kotatsu 1, and the upper surface of the table 19 is covered with a basket or blanket.

  When the digging kotatsu 1 having the above structure is used, both the bottom surface heater 7 and the side wall surface heater 7a are energized so that the heat from the bottom surface heater 7 passes through the heat storage material 8 in the furnace box 3. To conduct heat. A part of the heat from the side wall heater 7a is radiated as low-temperature far-infrared rays into the furnace box 3 via the heat radiating plate 13, and the remaining part is convectively conducted to the air inside the kotatsu 1. It will be.

  Then, a person sits on a squab or the like placed around the furnace box 3 of the kotatsu 1 and heats the legs by extending the legs into the furnace box 3, but the sole is a carpet on the heat storage material 8, etc. It is placed on the surface and receives contact heat conduction. Then, the heel portion faces a position away from the side wall heater 7a, receives radiant heat conduction, and further contacts the heated air in the kotatsu 1 to heat the leg portion and lower body.

  As mentioned above, the inside of this octopus adopts low-temperature heat generation that is not common sense compared with the conventional electric heating type digging ridge of about 35-36 ° C. Does not feel any heating. Some people felt that it was not switched on in some cases. However, the heating effect as described above is obtained by heating for about 15 minutes, soft warmth is given to the entire body, the lower body is warmed up more easily than the legs, and it can be felt that the body is gradually sweating.

  In addition, there is no precedent for excavation by cryogenic heat generation, and it is difficult to describe its comfort in detail, but for example, an infant is put to sleep with a part of its body in this kotatsu However, it is surprising that there are no problems such as low temperature burns or abnormal skin dryness.

  The heating effect of the legs of the digging kotatsu according to the present invention is similar to the feeling of being heated by being immersed in the “footbath”. As a precaution, when measuring the temperature distribution with infrared thermography, the temperature uniformity in the legs and the circulation effect of the heat flow throughout the body, despite the low temperature compared to the conventional kotatsu, It was even more remarkable.

  Further, since the planar heater used in the present invention is essentially power-saving, the electricity bill can be reduced to about half to １ ／ as compared with the conventional electric heating type drilling kotatsu.

(A) is sectional drawing of the digging kotatsu concerning embodiment of this invention, (B) is sectional drawing of a side wall part. (A) is detail drawing of the principal part of a digging kotatsu, (B) is sectional drawing of a heat sink. It is explanatory drawing of arrangement | positioning of the planar heater in a furnace box. It is a wiring diagram of the planar heater in a furnace box. It is sectional drawing which shows the whole excavation kotatsu. It is a perspective view for description of a low-temperature heating type planar heater. It is a top view for description of a low-temperature heating type planar heater. It is a graph for description of the PTC effect of a planar heater.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Kotatsu 2 Floor surface 3 Furnace box 5 Bottom plate part 7 Bottom surface heater 7a Side wall surface heater 8 Thermal storage material 9 Crosspiece (or carpet) 11 Recess 12 Surface treatment sheet 13 Heat sink (aluminum plate)
13a titanium oxide ceramic layer 13b amyl oxide ceramic layer 15 control device 16, 16a electric wire 18 heat insulation box 19 table 30 sheet heater 31 heater element H heat generating portion Ha side heat generating portion

Claims (9)

A bottom surface heater made of a thermoplastic resin and a heat storage material are laminated on the bottom plate portion of the furnace box, and a side wall surface heater made of a thermoplastic resin is provided on the side wall of the furnace box. A warm bath type digging kotatsu that is temperature controlled to generate heat at a temperature of ℃ or less. A bottom surface heater made of a thermoplastic resin and a heat storage material are laminated on the bottom plate portion of the furnace box, and a side wall surface heater made of a thermoplastic resin is provided on the side wall portion of the furnace box. A hot-bath type digging cot, the surface of which is covered with a metal heat sink, and the temperature of the double-sided heater is controlled so as to generate heat at a temperature of 50 ° C. or less.   3. The hot-bath digging kotatsu according to claim 1 or 2, wherein the thermoplastic resin planar heater is formed by extruding a mixture of a thermoplastic resin and carbon and has PTC characteristics.   The metal heat dissipating plate disposed on the surface of the side wall heater is characterized in that a titanium oxide ceramic layer and an aluminum oxide ceramic layer are formed in a double structure from the side closer to the side wall heater. The warm bath type digging kotatsu according to any one of claims 2 to 3.   A plurality of the bottom planar heaters are arranged in parallel on the top surface of the bottom plate part, and two side heaters are provided facing each other with the planar heater bent into an L shape. The hot-bath type digging kotatsu according to any one of claims 1 and 4, characterized in that   A recess having a depth and width capable of accommodating a planar heater is formed on the side wall surface of the furnace box, and the side wall surface heater is accommodated in the concave portion, and the surface of the side wall surface heater is covered with a metal heat sink. The hot-bath type digging kotatsu according to any one of claims 2 to 5, wherein: A bottom surface heater made of a thermoplastic resin and a heat storage material are laminated on the bottom plate portion of the furnace box, and a side wall surface heater made of a thermoplastic resin is disposed on the peripheral surface of the side wall of the furnace box. In the digging kotatsu where the exothermic temperature is controlled to 50 ° C. or less, the side wall surface heater radiates into the furnace box mainly using low-temperature radiant heat energy, and the radiant heat energy mainly forms the leg buttock. The hot-bath type digging kotatsu according to claim 1 or 2, wherein the hot-bath type digging kotatsu is configured to give a footbath effect by heating. The surface of the side wall heater is coated with a reflective metal heat radiating plate, radiant heat energy is radiated through the heat radiating plate, and radiant heat energy is reflected to fill the radiant heat energy into the furnace box. The warm bath type digging kotatsu according to claim 7, characterized in that the object to be heated contained in the furnace box is heated by efficiently applying radiant heat energy. A double ceramic layer consisting of a different lower ceramic layer and an upper ceramic layer formed on the lower ceramic layer is formed on the surface of the heat sink,
The ceramic layer has a shorter wavelength corresponding to a peak value in a distribution curve drawn on a radiation energy / radiation wavelength curve as an upper ceramic layer and a longer wavelength as a lower ceramic layer. The expected hot-bath digging kotatsu.

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