JP2010268772A - Heating method and apparatus by induction heating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heating method and apparatus capable of efficient heating with less electricity. <P>SOLUTION: This heating method includes flowing alternating current to an induction heating coil, making a heat generator generate heat by induction heating, and sending the heat to a plant cultivation greenhouse or a drying chamber etc. with a blower to heat their insides. The heating apparatus by induction heating includes the induction heating coil, the heat generator which is coupled with the induction heating coil and generates heat through electromagnetic induction, and the blower for sending out heat generation from the heat generator. The heat generator is formed by attaching at least two heat generating plates to the base material thereof. The heating value of the heat generator is automatically controlled by adjusting current flowing in the induction heating coil by installing a current adjusting part for adjusting a current amount to be supplied to the induction heating coil, a temperature detector for detecting the temperature of a heated place, and a control part for controlling the current adjusting part based on environment temperature detected with the temperature detector and set temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to heating by induction heating, and relates to a method for increasing the ambient temperature (environmental temperature) of plants and articles in plant cultivation and drying of articles, and an apparatus used therefor It is.

When cultivating plants in an agricultural house such as a plastic house (hereinafter referred to as “house”), the inside of the house (plant cultivation environment) may be heated, and a heating boiler or electric heater is used as a heat source as a heating device. Various heating facilities are generally used. Specifically, the temperature in the house is increased by blowing heat generated by a boiler or an electric heater into the house. In the case of a drying facility that dries agricultural products such as tobacco leaves, tea leaves, and cereals, a boiler or an electric heater is used as a heat source for raising the temperature in the drying facility.
Boilers that use fossil fuels have high CO ₂ emissions, one of the greenhouse gases that contribute to global warming. In addition, operating costs are not constant because they depend on fossil fuel prices. There was a problem. Electric heater type heaters have low heat generation efficiency and consume a large amount of power.

  Patent Document 1 proposes to use nighttime power to save energy, and Patent Document 2 and Patent Document 3 propose to generate warm air by heating air without using fossil fuel. However, in any case, since it is a heater type that directly heats liquid or air with electricity, the heat generation efficiency is not improved from the conventional one.

JP 2007-319089 A JP 2007-292431 A JP 2005-333840 A

  In view of the above problems, the present invention contributes to energy saving and environmental problems, and also includes a heating method and a heating device (including a heating device) by induction heating that can efficiently heat the inside of a house or a drying facility. ).

  The heating method by induction heating of the present invention is a method in which an alternating current is passed through an induction heating coil, a heating element is heated by induction heating, this heat is sent to a heating point by a blower, and the heating point is heated. is there. In this case, a heating location can also be made into a plant cultivation house or a drying room.

  The heating apparatus using induction heating according to the present invention includes an induction heating coil, a heating element that is electromagnetically coupled to the induction heating coil and generates heat, and a blower that sends out heat generated from the heating element.

  The heating apparatus by induction heating according to the present invention may be one in which two or more heat generating plates are attached to a base material that is disposed in the vicinity of the heat generating element.

  The heating device by induction heating according to the present invention is detected by a current adjustment unit capable of adjusting the amount of current supplied to the induction heating coil, a temperature detector for detecting the temperature of the heating point, and the temperature detector. By providing a control unit that can control the current adjusting unit based on the environmental temperature and the set temperature, and adjusting the current flowing in the induction heating coil, it is possible to automatically control the heat generation amount of the heating element.

The heating method by induction heating according to the present invention has the following effects.
(1) Since heat generation efficiency is good, energy saving and cost saving can be realized.
(2) Since no fossil fuel is used, global warming gas such as CO ₂ is not discharged, and environmentally friendly heating is possible.
(3) Almost no noise is generated as in the case of using a boiler, and the working environment such as plant cultivation and grain drying is improved.

The heating device by induction heating according to the present invention has the following effects.
(1) Since it can be reduced in size as compared with a boiler, it is easy to transport and install, does not require a large space for installation, and neither exhaust gas nor noise is generated.
(2) Since the configuration is simple, it is easy to manufacture, is not likely to fail, and is easy to maintain.
(3) Since the heat generation area can be increased by increasing the surface area of the heat generating plate of the heat generating element, it is possible to easily improve the heat generation efficiency.
(4) The heat exchange efficiency of the gas is improved by increasing the passage resistance of the air (gas) passing through the vicinity of the heat generating plate by changing the shape of the heat generating plate of the heat generating element to a spiral shape, a wave shape, a refractive shape, Heat generation can be used efficiently.
(5) Since the air passage is provided, the heat generated from the heating element can be efficiently delivered to a desired location, for example, a house or a drying chamber, by sending air to the air passage.
(6) Since the temperature control function is provided, temperature control suitable for plant cultivation and grain drying can be performed, and power consumption is not wasted.

(A) is structural drawing of the heating apparatus of this invention, (b) is the schematic which shows an example of the internal structure of a heating apparatus. An example of the heat generating body in the heating apparatus of this invention is shown, (a) is sectional drawing, (b) is a side view. The front view which shows the example which bent some heat generating plates of the heat generating body. Explanatory drawing which shows the example which connected the heating apparatus by the induction heating of this invention to a drying room, a heating chamber, etc. FIG. (A) is explanatory drawing which shows the example which attached the exhaust heat port to the heating apparatus by induction heating of this invention, (b) is explanatory drawing at the time of swinging the exhaust heat port.

(Embodiment 1)
An embodiment of a heating method and a heating apparatus by induction heating according to the present invention will be described with reference to the drawings.

  A heating device 1 shown in FIG. 1 includes an induction heating coil 2 disposed outside a pipe-shaped air passage 3 having heat insulation and insulation, and a heating element 4 disposed inside the air passage 3. A blower 5 disposed outside one end in the axial direction of the blower passage 3 and an AC power supply 6 for supplying power to the induction heating coil 2 are provided.

  In the induction heating coil 2, an alternating current supplied from the alternating current power supply section 6 flows, and the winding diameter, the number of windings, the winding pitch, the wire diameter, and the like are selected according to the application.

  The AC power supply unit 6 supplies AC to the induction heating coil 2, and may be any AC (high frequency) that can be induction heated with the heating element 4. As an example, a general-purpose IH power source can be used. . Specifically, for example, it can be three-phase 200V, single-phase 100V, and the like. The frequency can also be arbitrarily selected. For example, the frequency can be set to about 10 KHz to 1 MHz.

  The air blower 3 passes the air blown from the blower 5 and sends heat generated from the heating element 4 in the blower 3 to the outside, and its inner diameter, length, etc. are outside the heating element 4. It is selected according to the diameter, the length thereof, the inner diameter of the induction heating coil 2, the length thereof, and the like. Although the air passage 3 in FIG. 1 is cylindrical, the shape thereof may be other shapes such as a rectangular tube and a polygonal tube. The air passage 3 is made of a heat insulating material so that the heat generated from the heating element 4 does not easily escape to the outside of the air blowing path 3 and is made of an insulating material so as not to interfere with the induction heating generated between the induction heating coil 2 and the heat generating body 4. It is. As heat insulation / insulation material, asbestos, ceramic wool, and other heat insulation materials can be used. The air passage 3 has an inner diameter larger than the outer diameter of the heating element 4 so that a gap (air passage) is formed between the heating elements 4.

  The blower 5 sends out the heat in the blower passage 3 to the outside, and may be anything as long as gas can pass through, for example, a general-purpose blower (fan) or other equipment is used. can do. The gas to be sent may be air, but may be another gas (gas) having excellent heat conductivity.

  As shown in FIG. 2A, the heating element 4 has a large number (24 in the figure) of plate-like heating plates 8 attached radially on the outer periphery of a cylindrical base material 7. The heat generating plate 8 is attached along the axial direction of the base material 7. The heating element 4 has a shape and size that can be accommodated in the air passage 3. The heat generating plate 8 generates heat by eddy current flowing due to magnetic lines generated when an alternating current is passed through the induction heating coil 2, and is therefore formed of a material having electrical conductivity and electrical resistance, and generates heat more efficiently. Therefore, it is desirable that the material is a magnetic material, and stainless steel is preferable in consideration of durability and the like. However, the material is not limited to stainless steel, and may be other magnetic material or non-magnetic material. The base material 7 is preferably made of a material that can weld the heat generating plate 8, for example, iron or other metal, but even stainless steel that is difficult to weld can be used depending on the mounting structure. The shape of the base material 7 can be an arbitrary shape such as a polygonal column, a column with an arbitrary cross section, or a solid bar shape, not a cylinder.

  Although the heat generating plate 8 is arranged in parallel to the axis of the base material 7, it may be arranged irregularly or may be arranged in another state such as a spiral shape. As shown in FIG. 2 (a), the heat generating plates 8 can be arranged at non-uniform intervals instead of being arranged at equal intervals in the circumferential direction of the base material 7, and can be arranged other than radially. Since it is desirable that the heat generating plate 8 has a large surface area, the heat generating plate 8 is not limited to a flat plate but may be formed in other shapes such as a corrugated plate.

  When the heat generating plate 8 is densely arranged on the base material 7, spirally arranged, a corrugated plate is used, or the air is blown or curved in the middle, the air blown from the blower 5 is heated by the heat generating plate. It becomes difficult to circulate by receiving resistance at 8 (passage resistance increases). That is, the time during which the air stays in the air blowing path 3 becomes longer, the time for heat exchange with the heat generating plate 8 becomes longer, and the air can sufficiently absorb the heat. In order to increase the passage resistance of the wind sent from the blower and hitting the heat generating plate 8, it can be bent or curved in the middle of the heat generating plate 8 in the axial direction as shown in FIG. The part to be bent or curved may be one place or two places or more. The shape can be other shapes.

  In this embodiment, the induction heating coil 2 is disposed outside the air blowing path 3 and the heating element 4 is disposed inside. However, the arrangement is such that induction heating occurs between the induction heating coil 2 and the heating element 4. If the separation is provided, the induction heating coil 2 is arranged in the air passage 3 and the heating element 4 is arranged outside the pipe, or the heating element 4 and the induction heating coil 2 are arranged in the air passage 3. Any arrangement can be selected.

  The blower 5 sends ambient air into the blower passage 3, and a sirocco fan is employed in this embodiment, but other commonly used blowers such as a propeller type and a blower type can also be used. .

(Operation example of Embodiment 1)
When an AC current is supplied to the induction heating coil 2 from the AC power supply unit 6, lines of magnetic force are generated in the induction heating coil 2. Since the current flowing through the induction heating coil 2 is alternating current, the strength and direction of the lines of magnetic force change, thereby causing an eddy current to flow through the heating plate 8 of the heating element 4. Since the heating plate 8 has electrical resistance, Joule heat is generated by the flow of eddy current. When air is sent into the air passage 3 by the blower 5, the heat generated from the heat generating plate 8 is sent out from the exhaust port of the air passage 3 to the outside. This heat heats the outside of the air passage 3, for example, the inside of the house and the inside of the drying facility.

The heating method and heating apparatus by induction heating according to the present invention are far superior in thermal efficiency as compared with the conventional electric heater type warmer. Table 1 shows the result of the verification.

(Embodiment 2)
Another embodiment of the heating method by induction heating according to the present invention will be described. This embodiment is an embodiment for explaining the case where the present invention is used for plant cultivation or drying in a drying facility, and the basic structure and operation of the heating device 1 are the same as those of the first embodiment. .

In planting places for agricultural crops such as fields and orchards, and in planting places such as in the house, the environmental temperature of plant cultivation areas may be raised to promote growth. If one or two or more heating devices 1 are arranged in the house and the house temperature is heated, the cultivation can be promoted more effectively.

The heating device 1 does not send the hot air sent from the outlet of the air passage 3 directly into the house, but connects an air supply pipe to the outlet of the air passage 3 and pipes this air supply pipe into the house. Hot air can also be sent into the house from an outlet provided at an arbitrary location in the trachea. As the air supply pipe, various pipes such as a polyvinyl chloride pipe, a flexible pipe, and a tube can be used as long as hot air can be fed into the house. When the diameters of the air supply pipe and the air blowing path 3 are different, they may be connected via a reducer.

FIG. 4 is a view showing a state in which the heating device 1 is connected to the drying equipment 9. The drying facility 9 includes, for example, tobacco leaves and shiitake mushrooms, herbs used for herbal medicine, rice, wheat and other grains, compost, chicken manure and other fertilizers, feed plants, and the like (hereinafter referred to as “to-be-dried”). While the hot air is sent from the heating device 1 into the drying facility 9, the rotating shaft 10 provided in the drying facility 9 is rotated to rotate the plurality of blades 11 connected to the rotating shaft 10. The drying object can be dried while stirring the drying object in the drying equipment 9.

(Embodiment 3)
Another embodiment of the heating apparatus by induction heating according to the present invention will be described. This embodiment is an embodiment in the case where a current adjustment function is mounted on the AC power supply unit 6, and the basic structure and the operation thereof are common to the first and second embodiments. The current adjustment function can be constituted by, for example, means for inputting and storing a predetermined temperature, a temperature detector for measuring the environmental temperature, and a control unit in addition to the current adjustment unit.

(Operation example of Embodiment 3)
For example, the case where it is desired to keep the temperature in the house at 25 ° C. will be described below.
First, a numerical value (reference value) of 25 ° C. is inputted in advance using an input means and stored in the storage means. In addition, a temperature detector for measuring the environmental temperature is provided near the intake port of the heating device. In this state, the heating device 1 is operated to raise the temperature in the house. When the temperature in the house (detected temperature) exceeds 25 ° C., the control unit compares and determines the detected temperature of 26 ° C. and the reference temperature of 25 ° C., and sends an adjustment command signal to the current adjusting unit. The current adjusting unit receives the command signal and adjusts so that the current flowing through the induction heating coil 2 is weakened. The current adjustment unit uses the inverter function to convert the alternating current to direct current, return it to the alternating current again, and adjust the voltage when converting to direct current, so that the current adjustment unit adjusts the current flowing through the induction heating coil 2 can do. Or the electric current which flows into the induction heating coil 2 can also be adjusted by adjusting the frequency of alternating current when returning from direct current to alternating current. In any case, by adjusting the current flowing through the induction heating coil 2, the amount of heat generated in the heat generating plate 8 can be adjusted, the increase in the environmental temperature can be mitigated, and the set temperature (reference temperature) of 25 ° C. can be maintained. . When the detected temperature does not reach 25 ° C. (for example, 24 ° C.), the control unit makes a judgment by comparing the detected temperature 24 ° C. with the set temperature 25 ° C., and sends an adjustment command signal to the current adjusting unit. In response to the command signal, the current flowing through the induction heating coil 2 is increased to raise the ambient temperature to a set temperature of 25 ° C.

(Embodiment 4)
Another embodiment of the heating apparatus by induction heating according to the present invention will be described. This embodiment is an embodiment in which a blower pipe is attached to the outlet of the blower passage 3, and the basic structure and the operation thereof are common to the first to third embodiments.

  In the heating device 1 of FIG. 1, the direction of the exhaust port of the air passage 3 is fixed, so that hot air is sent out in a fixed direction. In the present embodiment, the bent pipe 12 is connected to the exhaust port of the air passage 3, and the bent pipe 12 can be rotated (swinged) around the axis of the air path 3, and hot air is sent out in the swing direction by this swinging. The temperature inside the room can be raised evenly.

  Since the present invention is lightweight and easy to install, it enables environmentally friendly and efficient heating, and is not limited to agricultural and drying hot air generators, for example, factories, public It can also be used as an indoor heating device for facilities, residences, etc., and can be used in various other fields that require heating, drying, and heating.

DESCRIPTION OF SYMBOLS 1 Heating device 2 Induction heating coil 3 Blower path 4 Heat generating body 5 Blower 6 AC power supply part 7 Base material 8 Heating plate 9 Drying equipment 10 Rotating shaft 11 Blade 12 Bent tube

Claims (5)

  A heating method by induction heating, in which an alternating current is passed through an induction heating coil, a heating element is heated by induction heating, and this heat is sent to a heating location by a blower to heat the heating location.   2. The heating method according to claim 1, wherein the heating location is in a plant cultivation house or a drying chamber.   An induction heating heating apparatus comprising: an induction heating coil; a heating element that generates heat by electromagnetic induction coupling with the induction heating coil; and a blower that sends out heat generated from the heating element.   The heating apparatus by induction heating according to claim 3, wherein the heating element has two or more heating plates attached to a base material arranged in the vicinity thereof.   The heating apparatus by induction heating according to claim 3 or 4, wherein a current adjusting unit capable of adjusting an amount of current supplied to the induction heating coil, a temperature detector for detecting a temperature of a heating portion, and the temperature By providing a control unit that can control the current adjustment unit based on the ambient temperature and the set temperature detected by the detector, and adjusting the current flowing through the induction heating coil, the heat generation amount of the heating element can be automatically controlled. A heating device by induction heating, characterized by

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