EP0176930A2

EP0176930A2 - Heat generating device and its applied system

Info

Publication number: EP0176930A2
Application number: EP85112082A
Authority: EP
Inventors: Nobuyoshi Kuboyama
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-09-29
Filing date: 1985-09-24
Publication date: 1986-04-09
Also published as: EP0176930A3; BR8504755A

Abstract

This invention relates to a heat generating device and its applied warming or drying system which utilizes the air friction heat generated within a sealed chamber at reduced balanced pressure. This device comprises at least two of the sealed chamber connected in series, and a control means for reducing the current supplied to a rotary means of the sealed chamber when the reduced balanced pressure is achieved in the chamber. The device further comprises a connecting chamber with a plurality of heated air discharging slits for connecting the outlet of the preceding sealed chamber in air flow and the following sealed chamber, and/or an opening degree adjusting member for reducing the inlet opening of the sealed chamber when the reduced balanced pressure is achieved, thereby improving heating efficiency and saving energy.

Description

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to a heat generating device which can be utilized for heat source to dry plants, grains, animal, human body, powder particles, and to warm a room and the like, and such drying and warming system in which the heat generating device is applied. Especially, this invention relates to a heat generation device and its applied system which utilizes the heat generation effect in reducing air pressure within a sealed chamber at a balanced level.

(2) Prior Art

Conventionally, there are known oil heaters, gas heaters, electric heaters and the like, each of which is employed for its respective purpose. A common disadvantage of them is that they consume large quantities of energy at a time when and energy cost is becoming more and more expensive. Particularly, the disadvantage of the electric heaters is that their thermal efficiency is low and power consumption is large and costly. Further, combustion of oil, coal or the like, besides being costly, also produces atmospheric pollution.
The principle of this invention is based upon our previous inventions U.S. patents 4,319,408; 4,426,793; 4,457,083, and Japanese Patent Application Publications Sho. 57-19582, 57-19583, 57-55378 and 57-55379, and Japanese Patent Publications Sho. 58-21185, entitled "Heating Process and its Apparatus in Reducing Air Pressure within a Chamber at a Balances Level".
In a typical heating system of these inventions, the air within the sealed chamber is sucked forcibly and discharged thereoutside by rotation of rotary means installed in the chamber. Then, the air pressure therewithin gets reduced at a balanced level. On the other hand, air friction heat is generated by a continuous rotation of rotary means, thereby the inside of the chamber is heated by the air frictio.
Otherwise, in addition to the above heationg manner, the ambient air is supplied into the heated chamber by manual or automatic operation. Therefore, various kinds of articles incorporated in the chamber may be dried efficiently and speedily due to the air pressure reduction effect as well as the air friction heat effect with low energy consumption.
In our previous invention Japanese Patent Applications Sho. 57-127779 entitled "Heating Process in Pressurized Air Pressure within a Chamber at a Balanced Level",' opening area of an outlet of the sealed chamber is less than the discharging force of the rotary means and thus the air is pressurized by discharging function.
Further, in our invention Japanese Patent Application Sho. 58-126256 entitled "Warm Wind Generating Process and its Apparatus", a plurality of sealed chambers is so aligned that each outlet of the following chamber. Thus air friction heat is generated by rotation of rotary means installed in each chamber and heat generating effect is multipled by a plurality of chambers connected in a line.
Such heat generating system is embodied in a manufacturing product such as a hair dryer as shown in Japanese Patent Application Sho. 58--166395.
Furthermore, variations of this heat generating system such as Japanese Patent Application Publication Sho. 58-172492 entitled "Rotary .Means with Multi-Stepped Fan" and Japanese Patent Application Publication Sho. 59-122856 have been provided by us.
However, such heat generating system comprising multiple connected chambers can not generate sufficiently heat to dry or warm the articles. That is, the temperature of heated air discharged from the heating device is lowen in comparison with the temperature of connecting member and sealed chamber walls.
It is desirable to warm or dry human body, animal, and powder or glanuler particles of medicine by using warm air at relatively low temperature. For room warmer, the heat generating device is not required to generate heated air at high temperature. It is important to consider the thermal efficiency over the whole warming or drying system.
Conventional device tends to cause troubles owing to over-heating of electric motor used as the rotary means. Since the motor is installed in the sealed chamber wherein the air friction heat is generated, and cooling air for the heated motors can not be introduced.
In is desirable to reduce noise caused by this heat generating device when it is used as a room warmer.
The task of this invention is to remove the aforementioned disadvantages of the conventional art and to represent a further novel element or system of the technical concept disclosed in the aforementioned our inventions.

BRIEF SUMMARY OF THE INVENTION

It is an object of the present invention to provide a heat generating device with superior efficiency which make use of air friction heat in reducing air pressure.
. It is another object of the present invention to provide a heat generating device with less energy cost.
It is another object of the present invention to provide a heat generating device the element of which is preventing from troubles owing to over heating.
It is further object of the present invention heat in reducing pressure, which can be fittingly applied to various drying systems and warming systems with reducing noise, low cost and nigh efficiency.
It is furthermore object of the present invention to provide a drying system and a warming system which is employed with a heat generating device making use of air friction heat in reducing pressure.
To accomplish the above objects, the heat generating device according to the present invention is based on following knowledges. In a typical heat generating device constituted in that a plurality of sealed chambers is aligned in air flow and sealingly connected, and electric motors installed in the chambers are electrically connected in parallel arrangement. the same heat generating effect can be achieved even when the downstream side motor in air stream is driven by smaller current rather than the upperstream side motor. The same effect can be achieved by arranging the motors in such that the capacity of the down stream side motor is smaller than that of the upperstream side motor.
After the heat generating device has been in reducing air pressure at a balanced level, heat generating effect is maintained constant even when the air inlet opening of the sealed chamber is changed smaller and thus the current for driving the downstream side motor is also decreased. Therefore, the heat generating device according to the present invention can be characterized by following features.
According to the first feature of the present invention, a heat generating device comprises a plurality of sealed chambers each of which contains an air inlet, an air outlet the opening of which is larger than that of the inlet, and a rotary means. This rotary means is so rotated as to suck air with higher sucking force rather than the inlet sucking capacity and the outlet dischraging capacity, thereby generating friction air heat in the region of the rotary means with keeping a difference between the reduced air pressure and the ambient aor pressure at a dalanced level. The electric motors for driving the rotary means are so controlled that the downstream side located motor is applied with smaller current rather than the upperstream side located motor.
According to the second feature of the present invention, adjoining sealed chambers are connected through a connecting chamber which has a plurality of slits through which heated air is discharged.
According to the third feature of the present invention, an adjusting means is detachably set in front of each air inlet of the sealed chamber. The adjusting means has a throttle opening the degree of which can be controlled by manual or automatically remote operation. The degree is the same or less than the opening of the inlet.
According to the fourth feature of the present invention, the motor for driving the rotary means is provided with heat proof means. This heat proof means may comprise main components for the motor which are made of heat resisting material such as ceramics. Otherwise, the motor may be covered with a material having a low thermal conductivity.
According to fifth feature of the present invention, the heat generating device is provided with noise reducing means. The noise -reducing means may comprise a noise proof material which is adapted to cover over all the heat generating device. The noise proof material is made of plastics, wood, paper, glass fiber, or mixture thereof. It is preferable that the noise proof material has heat resistance property to some degree.
According to sixth feature of the present invention, a room warming system utilizing the heat generating device described above comprises a first unit of sealed chamber which is installed in a room, a second unit of sealed chamber which is arranged outside of the room, and a connection pipe covered with thermal insulater, connected between the inlet of the first unit and the outlet of the second unit. A motor of the first unit is driven by smaller current. Preferably, the first unit may by covered with noise proof material and fixed to the wall through vibration absorbing material in order to reduce noise and vibration. Relatively cold air in the room is sucked in the second unit and heated therein, and further heated in the first unit. Finally heated air is discharged from the first unit.
According to the seventh feature of the present invention, a drying system utilizing the aforementioned heat generating device is adapted to dry glanuler particles. The heated air discharging outlet of the heat generating device is opened towards a net shape bottom of container in which the particles to be dried are dropped.
Other and further objects, features and advantages of this invention will appear more fully from the following description taken in connection with the accompanying drawings.

.BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic sectional view showing a heat generating device and its drying system according to a first embodiment of the present invention;
Fig. 2 is a partially sectional view showing the right side of FIg. 1;
Fig. 3 is a partially enlarged schematic sectional view showing another configuration of the heat generating device of the first embodiment shown in Fig. 1;
Fig. 4 is a schematic sectional view showing a second embodiment of the heat generating device as same as Fig. 4;
Fig. 5 is a schematic view showing an adjusting member used in the second embodiment shown in Fig. 4;
Fig. 6 is a schematic sectional illustration showing a foot warming system which employs a heat generating device according to the third embodiment of the present invention as a heat source;
Fig. 7 is a sectional view showing a heat generating device according to the third embodiment of the present invention;
Fig. 8 is a schematic illustration showing a room warming system according to a fourth embodiment of the present invention;
Fig. 9 is a partially sectional view showing a handy drier according to a fifth embodiment of heat generating device of the present invention;
Fig. 10 is a sectional view showing overall drying system adapted to dry glanuler particles according to a sixth embodiment of heat generating device of the present invention;
Fig. 11 is a sectional view taken along the line A-A in Fig. 10;

. Fig. 12 is a right side view of the drying system shown in Fig 10.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

A preferred embodiment of this invention will now be described with reference to the accompanying drawings.
Referring to Fig. 1 and Fug. 2, numeral 1 denotes a sealed container in a box shape in which a drying system is installed. The sealed container 1 is provided with an air intake 2 through which the ambient air is introduced into the container 1, and an exhaust outlet 3 through which exhausted air is discharged out of the container 1. Numerals 4 and 5 denote an intake passage connected to the air intake 2 and an outlet passage connected to the exhaust outlet 3 through which exhausted air is discharged out of the container 1. Numerals 4 and 5 denote an intake passage connected to the exhaust outlet 3, respectively. Further the intake passage 4 and the outlet passage 5 constitute a heat exchanger.
Numerals 6a and 6b denote and second sealed chambers, respectively. Each chamber is provided with an air inlet 7a(7b) and an air outlet 8a(8b). Opening of the outlet is larger than that of the inlet. The inlet 7a of the first chamber 6a is connected to the air intake passage 4 and the outlet 8b of the second chamber 6b is connected to the outlet passage 5. The first chamber 6a and the second chamber 6b are sealingly connected each other through a connecting chamber 9a.
Fig. 3 shows an modified example of this first embodied heat generating unit. The heat generating unit may be composed of two sealed chambers as shown in Fig. 1 or more as shown in Fig. 3.
Now, heat generating mechanism will be discussed on Fig. 3.
The first sealed chamber 6a is provided with a rotary means. Such rotary means consists of a rotary member 10a such as a propeller fan or a silocco fan and an electric motor lla. The second and third sealed chambers 6b and 6c are substantially same as the first chamber 6a, so that the same explanation is not repeated. The rotary member 10a is driven by the motor lla so as to suck the air from the inlet 7a. The motors lla, llb, llc are controlled by a controll unit, not shown. Further, the motors are provided with heat proof means. This heat proof means comprise main components for the motor which are made of heat resisting material such as ceramics. On the other hand, the motor may be covered with a material having a low thermal conductivity.
A fine gap g is defined between the rotary member 10a and the inner wall of the chamber 6a.
Opening of the inlet 7a is so determined that air sucking capacity of the inlet 7a is smaller than air sucking force caused by normal rotation of the rotary member 10a. Further, opening of the outlet 8a is also determined so that air discharging capacity of the outlet 8a is smaller than the air discharging force caused by the normal rotation of the rotary member 10a. Also, the second and third chambers 6b and 6c are similarly constituted as the above.
In this embodiment, the motors lla, llb, llc have the same performance and the current supplied to the motor lla to the third motor llc, so that the air discharging force of the upperstream side motor lla is larger than that of the downstream side motor llc. In order to perform this control, a control circuit for the motor to be lowered is further provided with a by-pass circuit. The other motor can be used for resistance installed in the by-pass. For example,the motors lla and 11b are used for the resistances in the by-pass for the control circuit of the motor llc.
The connecting chamber 9a (9b) is formed with a pair of slits 12a, 12b (12c and 12d) opening degree of which can be adjusted. Full opened of the slits 12a and 12b (12c and 12d) is smaller than air discharging force of the sealed chamber 6a (6b).
The articles 13 to be dried are installed in the sealed container 1 and then the motors are energized. Ambient air is introduced into the air intake 2 and flowed through the intake passage 4. The inner air in the sealed container 1 is also introduced into the intake passage 4 and mixed with the ambient air. The mixed air is fed into the first chamber 6a through the first inlet 7a. Since the opening of the air inlet 7a is smaller than the air sucking force of the rotary member 10a and also smaller than that of the air outlet 8a, sucked air becomes less in comparison with the discharged air by the rotary member 10a. Therefore, the pressure of rotating area of the rotary member 10a is reduced rather than the other space and thus the inner pressure of the first chamber 6a is also reduced. Difference between the air pressure of the rotating area and that of the other space, and between a reduced air pressure of the inner space of the chamber and a normal air pressure thereoutside gradually becomes larger, but after short time the difference therebetween is maintained. at balanced level. The air pressure difference is defined by a sucking force of the rotary member 10a, the gap g between the rotary member and the chamber wall, and the opening of the air inlet 7a, but the difference between the reduced air pressure within the chamber 6a and the ambient air pressure is maintained at a balanced level as the rotary member 10a is rotated continuously.
At the reduced balanced level of the air pressure an air retaining phenomenon is generated in the rotary area of the rotary member 10a. Since the rotary member 10a is rotated continuously at high speed in that area, air friction heat is generated and the air temperature is gradually risen. The heated air is forcibly discharged out of the chamber 6a through the outlet 8a by rotation of the rotary member 10a. Further, since the discharging capacity of the outlet 8a is smaller than the discharging force of the rotary member 10a, the discharged air is pressurized at the outlet 8a and heat is generated owing to this pressure. The discharged air is further heated by this pressure heat.
The same heat generating operation is performed in the other chambers 6b and 6c.
In this embodiment shown in Fig. 1, the chambers 6a and 6b are sealingly aligned through a connecting chamber 9a which is connected between the chambers 6a and 6b. Thus, the discharged heated air form the first chamber 6a is partially sucked into the sealed container 1 through the slits 12a and 12b of the first connecting member 9a. Heated air is partially discharged into the outlet 8b of the second chamber 6b. The air is exhaused outside from the exhaust outlet 3 after the heat is transferred from the heated air in the outlet passage 5 to the fresh air in the intake passage 4.
According to this structure, the outlet side of the chambers are not only prevented from over-heating, but the temperature in the container 1 can be also quickly risen to demand level. The articles installed in the container 1 can be effectively dried even though the heated air is relatively low temperature.
Referring to Fig. 4, there is shown a second embodiment of heat generating device according to the present invention. The same reference numerals denote the same or corresponding elements or parts in the first embodiment shown in Fig. 1, so that the same explanation is not repeated to avoid complication.
In this second embodiment, the heat generating device further comprises an adjusting means 13a (13b) detachably set in front of the inlet 7a (7b) of the chamber. As shown in Fig. 5, the adjusting means 13a (13b) comprises a throttle 14a(14b) such as an iris diaphragm the opening degree of which can be controlled by manual or automatically remote operation. The opening degree is controlled to the same or less than that of the inlet 7a(7b).
This adjusting means 13a(13b) is secured to the chamber 6a(6b) through bolts and the opening degree of the throttle 14a(14b) is kept maximum; i.e., the same as the opening of the inlet 7a(7b). Under this condition, the motors lla and llb are energized to generate the same phenomenon as explained and the air pressure has been maintained at reduced balanced level, the opening degree of the throttles 14a and 14b are minimized to smaller than that of the inlets 7a, 7b. Although the current supplied to the motors lla and llb are decreased, heat generation is continued at the same reduced pressure level.
For example, the assembled motor is driven by current of 30 A under the normal pressure condition. When the opening degree of throttle is maintained maximum, current requires 15 A under the reduced balanced pressure condition. Further, when the opening degree is smaller than the inlet opening of the chamber, current for the motor require 10 A under hte same reduced balanced preessure level. Relation between the opening degree of the throttle and the motor current is based in 'performance and specification of the used motor, dimension of the heat generating device, various ambient conditions or the like, so that it is determined in experiential manner. The heated air generated by the device is circulated and exhausted in the same ways as shown in the

first embodiment.

Referring to Fig. 6, there is shown an example of warming system according to the heat generating device of the present invention. Fig. 7 shows a third embodiment of the heat generating device which is adapted to use in this warming system. In these drawings, the same reference numerals denote the same or corresponding elements or parts in the first embodiment, so that the explanation is not repeated to avoid complication.
The warming system shown in Fig. 6 was been typically and traditionally used in Japanese house, called "Kotatsu". Kotatsu essentially consists of a heat source 22, a lower box 21, and a table shape frame 23. In the drawing, a rectangular opening (for example 90cm _x90cm) is formed in a floor 20. The lower box 21 is fit in the rectangular opening. The heat source 22 is installed in the bottom of the lower box 21. The table shape frame 23 is constructed on the lower box 21 and covered with a quilt 24 to keep warm air in the space defined between the box 21 and the frame 23. As illustrated in a phantom line, a person sits in the Kotatsu box in order to get warm. As the heat source for Kotatsu, charcoal or electric heater has been conventionally used.
In this warming system, the heat generating device 22 according to the third embodiment is installed in a heat source container 25. As shown in Fig. 7, the heat generating device 22 is covered with a noise proof material 26 made of plastics, wood, paper, glass fiber, porous wooden material, or the mixture thereof, and fixed to the bottom of the container 25 through a vibration absorber 27. Numeral 28 benotes a heater cover in a net shape through which heated air is passed.
Since the heat generating device shown in Fig. 7 is essentially same as the first embodiment except for noise proof means, the explanation on heat generating operation is not repeated.
The heated air from this device 22 is discharged into the heater container 25 and then passed through the cover 28. In the Kotatsu box, the heated air is forcibly circulated as shown by the arrow in Fig. 6. The Kotatsu box is a narrow space about 1m^s, so that air temperature in the Kotatsu is quickly risen to required level. The heat generating device according to the present invention can provide comfortable and low cost warming system.
Fig. 8 shows a fourth embodiment of the present invention, wherein the heat generating device is adapted to room warmer. Numeral 30 denotes an inner unit of heat generating device and numeral 31 denotes an outer unit. The inner unit 30 and the outer unit 31 is connected to a connecting pipe 32 covered with an insulating material. Structure and the outer unit 31 are substantially same as the device of the first embodiment. The outlet side chamber 6c in Fig. 3 corresponds to the inner unit 30. The inlet side chambers 6a and 6c also correspond with noise proof means as shown in Fig. 7 and mounted on inner wall 34. The outer unit 31 is connected to an intake pipe 35 which introduces relatively cool air near by floor 33.
As discussed in the first embodiment, the downstream side motor can be activated by smaller current rather than the other. Therefore, the inner unit 30 is activated by smaller current, so that motor noise is reduced.
Fig. 9 shown a fifth embodiment of the heat generating device according to the present invention which is used as a heat source for a handy hair drier. Numeral 40 denotes a hair drier which is mainly composed of an air intake 41, a blower nozzle 42, a grip 43, and heat generating means. This heat generating means is essentially same as the heat generating device shown in Fig. 3. Numeral 44 denotes a sealed chamber which contains an inlet 45 and an outlet 46. Numeral 47 denotes a rotary member such as propeller fan or a silocco fan which is actuated by a motor 48. Relation among the dimension of the inlet 45 and outlet 46 and air sucking force of the rotary member 47 is essentially same as the first embodiment. In this embodiment three chambers are sealingly connected as shown in Fig. 9 and a current supplied to the blower nozzle side motor is less than the air intake side motor. Heat generating mechanism within each chamber is also essentially same as the first embodiment, so that the same explanation is not repeated.
This embodied hair drier provides various advantages in comparison with conventional electric resistance heating type hair drier. Conventional drier needs rotary means to generate wind in addition to heating means, and tends to blow over-heated air onto a person's hair. On the other hand, the embodied hair drier employs rotary means as a heat source and thus blows relatively low heated air, for example about
40.C to 60_°C, suitable for human's hair. This new hair drier does not need metal elements used as heat-resisting parts against high temperature generated by resistance heater, so that many plastic parts can be employed instead of such metal parts. This results in a light and compact handy hair drier.
Fig. 10 shows the sixth embodiment wherein the heat generating device according to the present invention is applied to a drying system for glanuler particles. Fig. 11 is a sectional view taken along the line A - A in Fig. 12 shows a right side view of Fig. 10.
In Fig. 10, numeral 51 denotes a drying apparatus to dry glanuler particles 52. The drying apparatus 51 comprises a particle container 53 which is provided with a net shape bottom. Openings of the net shape bottom are so determined as to prevent the particles to be dride from passing therethrough. The container 53 is composed of a hollow cylindrical upper core and a bottom widened cone shape lower core. The cone shape lower core acts as a regulator to adjust the amount of particles 52 falling down to the bottom. Numeral 54 denotes as air intake window through which ambient fresh air is introduced in the apparatus. Also, numeral 55 denotes an exhaust window through which heated air is exhausted outside. The intake window 54 and the exhaust window 55 are respectively connected to an intake passage 56 and an exhaust passage 57. These passages 56 and 57 configure a heat exchanger. A heat source is composed of first and second heat generating units 58 and 59. The air intake passage 56 is connected to an inlet of the first unit 58 and the exhaust passage 57 is connected to an outlet of the second unit 59, respectively. The heat source is not only assembled by two heat generating units as shown in Fig. 11, but also three or more. Each unit is constituted in the same as the heat generating device explained in the first embodiment, so that the heat generating mechanism and its control manner are essentially same as the first embodiment. Further, although there is not shown in Fig. 11, it is of course that a connecting chamber may be installed between the first unit 58 and the second unit 59. Numeral 60 denotes a heated air discharging outlet which opens towards the bottom of the particle container 53. The bottom is connected to a thrower 61 through a conduit 62. The thrower 61 contains a screw conveyer for transporting the particles from the bottom to the top of the container 53.
When the heat generating units 58 and 59, and the thrower 61 are energized, the fresh air is sucked from the air intake window 54 and flowed through the intake passage 56. At point B, the sucked air is mixed with the air from the hollow cylindrical upper core of the particle container 53. The mixed air is introduced in the inlet of the first heat generating unit 58 and subjected to heat generating operation.
In these first and second heat generating units 58, 59, the principle and mechanism of heat generating are essentially same as the

first embodiment.

The heated air at the outlet of the second unit 59 has the highest temperature and is partially introduced to the heated air discharging outlet 60. The heated air is blown from the outlet 60 to the net shape bottom of the particle container 53. The glanuler particles 52 are subjected to the heated air blowing up from the bottom. The dried particles 52 are smoothly transported to the thrower 61 since the lumped particles 52 are broken into fine and isolated particles by blowing air. The partickes 52 are repeatingly fed to the top of the container 53. This operation is repeated in order to completely dry the particles 52.
The heated air introduced in the exhaust passage 57 is exhausted outside from the exhaust window 55 after heat exchaning between the . intake passage 56 and the exhaust passage 57.
Although, in the aforementioned embodiments, the sealed chambers containing the rotary means are not moved, this invention is not limited to this structure. That is, the sealed chambers per se may be also rotated in the counter direction of the rotary member by another driving unit in addition to the rotary means installed in the chamber. Such structure can further improve heat generating efficiency.
It is further understood by those skilled in the art that the forgoing description is a preferred embodiment of the disclosed device and that various changes and modifications may be made in the invention without departing from the spirit and scope thereof.

Claims

1. A heat generating device comprising;

at least two of sealed chamber, each chamber containing an air inlet, an air outlet the opening of which is larger than that of the inlet and a rotary means, said rotary means being electrically actuated so as to suck air with higher sucking force rather than the inlet sucking capacity and the outlet discharging capacity , thereby generating a difference between the reduced air pressure within said chambers being connected to the rotary means after the difference between the reduced air pressure and the ambient air pressure is maintained at a balances level, said chambers being connected in series; and a control means for reducing the current which is supplied to the rotary means after the difference between the reduced air pressure and the ambient air pressure is maintained at a balanced level.

2. A heat generating device as set forth in claim 1, where said sealed chambers are sealingly connected each other through a connecting chamber which is provided with a plurality of slits through which heated air is discharged.

3. A heat generating device as set forth in claim 1 or 2, wherein said control means so controls the current that the downstream located rotary means is suppled with smaller current rather than the upperstream located means.

4. A heat generating device as set forth in claim 3, wherein said control means comprises a by-pass circuit attached to the circuit for said rotary means to be controlled, and said by-pass circuit containing another electric motor of the rotary as a resistance.

5. A heat generating device as set forth in any one of claims 1 to 4, wherein said each chamber is provided with an adjusting means for regulating the opening degree of said air inlet of the chamber, and said adjusting means can be automatically remote-controlled from the outside of said chamber.

6. A heat generating device as set forth in any one of claims 1 to 5, wherein said rotary means is provided with heat proof means.

7. A heat generating device as set forth in claim 6, wherein said heat proof means comprises heat proof material such as a ceramics used for main parts for the motor of said rotary means.

8. A heat generating device as set forth in claim 6, wherein said heat proof means comprises a covering material having low heat conductinity for covering overall of the motor of said rotary means.

9. A heat generating device as set forth in any one of claims 6 to 8 used as a heat source for a handy hair drier.

10. A heat generating device as set forth in any one of claims 1 to 8, further comprising a noise proof and vibration absorbing means.

11. A heat generating device as set forth in claim 10, wherein said noise proof and vibration absorbing means comprises a covering member for covering overall of said heat generating devises, said covering member being made of plastic, wood, paper, glass fiber, or mixture thereof, and said noise proof material being provided with heat resistance property to some degree.

12. A heat generating device as set forth in claim 10, wherein said noise proof and vibration absorbing means comprises a seat made of vibration absorbing material through which said heat generating device is fixed to a floor or wall.

13. A heat generating device as set forth in any one of claims 10 to 13 used as a heat source for a Kotatsu (Japanese traditional warming system).

14. A heat generating device as set forth in any one of claims I to 8, wherein said sealed chamber can be rotated in the counter direction of said rotary means by another actuating means provided in addition to the actuating means for said rotary member.

15. A warming system utilizing the heat generating device according to claim 1 or 2 as a heat source, comprising;

an inner heat generating unit installed in a room to be warmed;

an outer heat generating unit installed outside of the room, said outer unit having an air inlet through which a relatively cold air in the room is sucked into said outer unit;

a connecting pipe sealingly connected between the inlet of said inner unit and the outlet of said outer unit, said connecting pipe being covered with a thermal insulating material;

a control means for reducing electric current for actuating said inner unit rather than said heat generating units and the ambient normal air pressure is maintained at a balanced level.

16. A warming system as set forth in claim 15, wherein said inner heat generating unit is covered with a noise proof material and fixed to a room wall through a vibration absorbing seat.

17. A drying system utilizing the heat generating device according to any one of claims 1 to 8 as a heat source compeising;

a sealed container (1) for containing the articles to be dried;

an air intake (2) formed in one side of said sealed container;

an exhaust outlet (3) formed in the same side of said sealed container;

an intake passage (4) one end of which is connected to said air intake (2);

an outlet passage (5) one end of which is connected to said exchange outlet (3);

an heat exchange means constituted by said intake passage (4) and said outlet passage (5);

a heat source consisting of at least two of heat generating sealed chambers (6), the inlet of the upper stream side chamber being connected to the other end of said intake passage (4), and the outlet of the downstream side chamber being connected to the other end of said exhaust passage (5);

at least one of connecting chamber (9) connected between said sealed chambers (6), said connecting chamber (9) being formed with a plurality of slits (12) through which heated air can be discharged into said container (1); and

a control means for reducing current supplied to each rotary means installed in said chambers (6).

18. A drying system utilizing said heat generating device according to any one of claims 1 to 8 as a heat source, compeising;

a particle container (53) for containing glanuler particles to be dried, said container (53) provided with a net shape bottom;

a hollow core installed in said container (53), said hollow core being composed of a cylindrical upper section and a lower section in a bottom widened cone shape for regulating falling amount of the glanuler particles;

an air intake passage (56), through which ambient fresh air is sucked in the system;

an exhaust passage (57), through which heated air is exhausted outside;

a heat exchange means constituted by said intake passage and said exhaust passage for exchanging the heat from the exhaust air to the fresh air;

a heat generating device (59) for generating an air friction heat at a reduced balanced air pressure, an inlet of said heat generating device being connected to said intake passage (56) and an outlet of side device being connected to said exhaust passage (57);

a control means for reducing the current for said heat generating device (59);

a heated air discharging outlet (60) for discharging the heated air from said heat generating device to the net-bottom of said particle container (53);

a thrower (61) for transporting the particles to the top of said container (53); and

a conduit (62) connected between said bottom and said thrower (61).