JP2014191932A - Heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a supply amount and an outflow temperature from changing according to a heating temperature and a vapor generating amount of an object to be heated, and to reduce opportunities in which a scale is attached to an exothermic body.SOLUTION: In a cross section perpendicular to a wound axial direction of a heating coil (3) of an exothermic body (4) in a heating apparatus (1), a cross sectional area occupied by a flow path (10) on an outflow side (6) is larger than a cross sectional area occupied by the flow path (10) on an inflow side (5).

Description

  The present invention relates to a heating device, and more specifically to a heating device that heats a liquid object to be heated such as water by an electromagnetic induction heating method.

  An electromagnetic induction heating type heating device includes a heating coil and a metal-made heating element. In such a heating device, when an alternating current is passed through the heating coil and the magnetic flux generated thereby is passed through the heating element and generated by electromagnetic induction, Joule heat is generated by the electrical resistance of the heating element itself. Further, when the heating element is a magnetic substance, heat is generated due to hysteresis loss. The heat is transferred to the object to be heated.

  In the electromagnetic induction heating type heating apparatus, as a configuration for generating steam from a liquid object to be heated, for example, a steam generating apparatus described in Patent Document 1 can be cited. In the steam generating means in the steam generating device of Patent Document 1, the end face and the side surface of the porous heating element are covered with a water absorbing material, and water is passed through the holes of the heating element heated by electromagnetic induction heating. Steam is generated. The water absorbing material is used for the purpose of intermittently supplying water to the heating element. In addition, water is supplied with respect to an absorber or a heat generating body with a pump. Then, the supplied water is applied to the absorbent material or the heating element, or soaks the absorbent material or the heating element.

JP 10-339401 A (published on December 22, 1998)

  The volume expands as the liquid phase transitions to vapor or gas. For example, when the phase transition from water (liquid) to water vapor (gas) is known, the volume expands 1000 times or more. The interior of the steam generating means in the steam generating apparatus of Patent Document 1 is in a state where the atmospheric pressure is high due to the expansion of air existing by heating and the volume expansion by evaporation of water. It is estimated that the steam generator of Patent Document 1 uses this atmospheric pressure to cause water vapor to flow out. However, the pressure inside the steam generating means is applied not only to the outflow side from which water vapor flows out, but also to the supply side for supplying water. Therefore, when the supply amount of water is compared before and during the generation of steam, the supply amount of water during the generation of steam is reduced.

  Therefore, the steam generator of Patent Document 1 has a problem that the amount of steam generated differs between the time when steam generation starts and the time after the start of steam generation.

  Further, when the supply amount of water supplied to the steam generating means is reduced by volume expansion, the steam generation amount is reduced and the atmospheric pressure is lowered. And as the atmospheric pressure decreases, the water supply amount tends to recover. Then, the steam generation amount increases again due to the recovery of the water supply amount, and the atmospheric pressure rises. As described above, in the steam generator of Patent Document 1, a loop of lowering and rising is repeated for the air pressure inside the steam generating means, and as a result, there is a problem that unevenness occurs in the amount of steam generated. Furthermore, when the supply amount of water supplied to the steam generating means varies, the temperature of the steam flowing out from the steam generating means also varies.

  On the other hand, solid substances called scales generated from impurity components contained in water accumulate in fine pores of the porous heating element due to the long-term use of the steam generator. This scale is composed of calcium carbonate and silica. The scale causes clogging in the holes of the heating element, resulting in a problem that the amount of generated steam is reduced. In particular, in the steam generator of Patent Document 1 in which the entire heating element is made of a porous body having micropores, the probability of this clogging increases.

  The present invention has been made in view of the above-described conventional problems, and the object thereof is that the supply amount and the outflow temperature do not change or fluctuate depending on the heating temperature and steam generation amount of the object to be heated, and the heating element is scaled. An object of the present invention is to provide a heating device that can reduce the chance of adhesion.

  In order to solve the above problems, a heating device according to an aspect of the present invention includes a heating coil casing having a heating coil wound around an outer periphery thereof, and a heating element disposed in the heating coil casing. The heating element is provided with a plurality of flow passages through which the heated object passes from one side in the winding axis direction of the heating coil to the other side, and the liquid heated object is passed through the flow path. In the heating apparatus that flows in from one side and heats out from the other side, the total cross-sectional area occupied by the first flow passage on the outflow side in the cross section perpendicular to the winding axis direction in the heating element Is characterized in that it is larger than the total cross-sectional area occupied by the second flow passage on the inflow side.

  According to one aspect of the present invention, the water supply amount and the outflow temperature are not changed or fluctuated depending on the heating temperature of the object to be heated and the amount of steam generated, and the opportunity for the scale to adhere to the heating element can be reduced.

It is sectional drawing which shows schematic structure of the heating apparatus which concerns on Embodiment 1 of this invention. 2 is a cross-sectional view schematically showing an A-A ′ cross section and a B-B ′ cross section shown in FIG. 1, showing an example of a configuration of a heating element provided in the heating device of FIG. 1. FIG. 5 is a cross-sectional view schematically showing the A-A ′ cross section and the B-B ′ cross section shown in FIG. 1, showing another example of the configuration of the heating element provided in the heating device of FIG. 1. FIG. 5 is a cross-sectional view schematically showing still another example of the configuration of the heating element provided in the heating device of FIG. 1, and schematically showing the A-A ′ cross section and the B-B ′ cross section shown in FIG. 1. It is sectional drawing which shows the further another example of a structure of the heat generating body with which the heating apparatus of FIG. 1 was equipped, and shows the cross-sectional shape along the direction which goes to an outflow side from an inflow side. It is sectional drawing which shows the further another example of a structure of the heat generating body with which the heating apparatus of FIG. 1 was equipped, and shows the cross-sectional shape along the direction which goes to an outflow side from an inflow side. It is sectional drawing which shows schematic structure of the heating apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows schematic structure of the heat generating body with which the heating apparatus which concerns on Embodiment 3 of this invention was equipped. It is sectional drawing which shows the other structure of the heat generating body with which the heating apparatus which concerns on Embodiment 3 of this invention was equipped. It is sectional drawing when it shows still another structure of the heat generating body with which the heating apparatus which concerns on Embodiment 3 of this invention was equipped, and cut | disconnects in a surface perpendicular | vertical with respect to the direction which goes to an outflow side. It is sectional drawing when it shows still another structure of the heat generating body with which the heating apparatus which concerns on Embodiment 3 of this invention was equipped, and cut | disconnects in a surface perpendicular | vertical with respect to the direction which goes to an outflow side.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Of course, the present invention is not limited to this, and the configuration described in this embodiment is not intended to limit the scope of the present invention to this unless otherwise specified. This is just an illustrative example.

  Moreover, in each embodiment of this invention, what has the same structure and attaches | subjects and demonstrates the same name and the same code | symbol.

Embodiment 1 Configuration Example of Heating Device FIG. 1 is a cross-sectional view illustrating a schematic configuration of a heating device 1 according to this embodiment. As shown in FIG. 1, the heating device 1 according to the present embodiment includes a heating coil housing 2, a heating coil 3, a heating element 4, a pump 7, and a liquid tank 8.

  The heating coil casing 2 has a cylindrical shape and houses the heating element 4 therein. The material of the heating coil housing 2 is preferably a non-magnetic material that has a low dielectric constant and is not heated by electromagnetic induction. Examples of the material of the heating coil housing 2 include a resin having heat resistance such as a Teflon (registered trademark) material and a silicon material. The heating coil 3 is made of a copper wire having a small electric resistance, and is wound around the outer periphery of the heating coil housing 2.

  The heating element 4 has a cylindrical shape and is installed in a state of being inserted into the heating coil housing 2. The material of the heating element 4 is preferably a material having magnetic permeability and electric resistance suitable for heating by electromagnetic induction, and examples thereof include iron, stainless steel, and carbon-containing ceramics. The material of the heating element 4 may be a material having good thermal conductivity, such as an aluminum alloy, which can be heated by electromagnetic induction by increasing the frequency of the alternating current.

  The pump 7 is a non-heating part supply means for supplying a liquid that is the object to be heated 9 to the heating element 4. The liquid tank 8 is a tank for storing the article 9 to be heated. In addition, the to-be-heated material 9 should just be liquid, and water is mentioned as a typical substance. Moreover, when the to-be-heated material 9 is water, functional water, such as ionized water, is also included. In the following description, water will be mainly described as the article 9 to be heated.

  In the heating device 1, the heated object 9 stored in the liquid tank 8 is supplied to the heating element 4 by the pump 7. Then, it is heated while passing through the inside of the heating element 4, becomes liquid, gas, or gas-liquid and flows out of the heating element 4. Here, let the side to which the to-be-heated material 9 flows in the heat generating body 4 be the inflow side 5, and let the side to which the to-be-heated material 9 flows out be the outflow side 6. The heating element 4 is provided with a plurality of flow passages 10 so that the heated object 9 can flow from the inflow side 5 toward the outflow side 6. The flow passage 10 will be described later.

  Here, the heating of the article 9 to be heated inside the heating element 4 will be described. Inside the heating element 4, the article 9 to be heated is heated by electromagnetic induction. The heating device 1 is provided with means for flowing an alternating current to the heating coil 3 (not shown). By this means, an alternating current of about several tens of kHz is passed through the heating coil 3 to generate an alternating magnetic field. As a result, the magnetic flux passes through the heating element 4, and an eddy current is generated in the heating element 4 by electromagnetic induction. The heating element 4 is heated by the Joule heat generated by the eddy current and the electric resistance of the heating element 4 itself (the heating element 4 generates heat). In addition, when the heat generating body 4 is a magnetic body, it generates heat also by hysteresis loss. Such heating by electromagnetic induction is because only the heating element 4 is heated and there is no need to bring the heating element 4 and a member such as the heating coil 3 into contact with each other. The feature is that it can be heated.

  The heated object 9 flows from the inflow side 5 into the flow passage 10 of the heating element 4 heated by electromagnetic induction in this way. At this time, heat is transmitted from the heated heating element 4 to the object to be heated 9 in the flow passage 10, and the object to be heated 9 is heated. And by this heating, a part or all of the article 9 to be heated becomes steam and flows out from the outflow side 6.

  Here, it is known that the volume of the article to be heated 9 expands when the phase transitions from liquid to gas. When the article 9 to be heated is water, the volume expands 1000 times or more. Therefore, the heated object 9 that has become steam inside the heating element 4 has a larger volume than that flowing from the inflow side 5 and flows out from the outflow side 6. The volume expansion due to the heating of the heated object 9 not only urges the outflow of the heated object 9 to the outflow side 6 but also affects the inflow of the heated object 9 on the inflow side 5. As a result, the supply amount to the heating element 4 of the article 9 to be heated fed by the pump 7 decreases.

  The heating device 1 according to the present embodiment is configured to reduce a decrease in the supply amount of the heated object 9 to the heating element 4 due to such volume expansion of the heated object 9. Specifically, in the cross section perpendicular to the direction from the inflow side 5 to the outflow side 6 of the heating element 4, the area occupied by the flow passage 10 on the outflow side 6 is larger than that of the inflow side 5. is there. As a result, when the heated object 9 is heated and expands in volume inside the heating element 4, it flows out into the space on the outflow side 6 where the space volume is large and easily expands, while backflow to the inflow side 5 is reduced. The Therefore, a decrease in the supply amount of the heated object 9 to the heating element 4 due to the generation of steam is reduced.

  Here, the specific structure of the flow path 10 which is the characteristic structure of the heating apparatus 1 which concerns on this embodiment is demonstrated using FIGS. 2 to 4 each show an example of the configuration of the heating element 4, schematically showing the AA ′ section (inflow side 5) and the BB ′ section (outflow side 6) shown in FIG. 1. It is sectional drawing.

  As shown in FIG. 2, the heating element 4 has a configuration in which the number of the flow passages 10 is greater on the outflow side 6 (BB ′ cross section) than on the inflow side 5 (AA ′ cross section). May be. The heating element 4 shown in FIG. 2 can be manufactured, for example, by processing or molding one flow passage 10 on the inflow side 5 so as to branch into a plurality of flow passages 10.

  Further, as shown in FIG. 3, the heating element 4 has a hole diameter of each flow passage 10 on the outflow side 6 (BB 'cross section) compared to the inflow side 5 (AA' cross section). The configuration may be large. The heating element 4 shown in FIG. 3 can be manufactured, for example, by forming or molding a tapered hole as the flow passage 10 so that the hole diameter increases from the inflow side 5 toward the outflow side 6. .

  As shown in FIG. 4, the heating element 4 may be made of a porous metal. In this case, the porosity of the inflow side 5 (A-A 'cross section) is small, and the porosity of the outflow side 6 (B-B' cross section) is large. The heating element 4 shown in FIG. 4 can be manufactured by, for example, reducing the amount of pore material on the inflow side 5 and increasing on the outflow side 6 when manufacturing the porous metal constituting the heating element 4. is there. Further, when the porous metal constituting the heating element 4 is manufactured, the porous material can be manufactured by reducing the particle size of the pore material on the inflow side 5 and increasing it on the outflow side 6. Further, when metal fibers are used as the material of the porous metal and the metal fibers are pressed, the amount of metal fibers on the inflow side 5 can be increased and the amount of metal fibers on the outflow side 6 can be decreased.

  The heating element 4 shown in FIGS. 2 to 4 has a configuration in which a plurality of heating members (parts: elements) having different area ratios occupied by the flow passage 10 from the inflow side 5 to the outflow side 6 are stacked. May be. That is, the inflow side 5 is provided with a first heat generating member with a small proportion of the flow passage 10, and the outflow side 6 is provided with a second heat generation member with a large proportion of the flow passage 10. One heating element 4 may be configured by connecting the second member by welding or the like at the outer periphery.

  By using the heating element 4 shown in FIGS. 2 to 4, the heated object 9 that has undergone volume expansion inside the heating element 4 is selectively expanded to the outflow side 6 where the free space is relatively large. As it flows out, expansion to the inflow side 5 is suppressed. Therefore, it is possible to realize the heating apparatus 1 that stably supplies the heated object 9 to the heating element 4 without reducing the supply amount of the heated object 9 by the pump 7.

  5 and 6 are cross-sectional views showing another configuration example of the heating element 4 and showing a cross-sectional shape along a direction from the inflow side 5 toward the outflow side 6.

  In the configuration shown in FIG. 5, the heating element 4 has a cylindrical shape in which an opening 11 is provided on the outflow side 6. A plurality of flow passages 10 communicating with the opening 11 are provided on the inflow side 5 of the heating element 4. Further, the inner bottom surface 12 of the opening 11 is disposed in the winding area 13 of the heating coil 3.

  As a result, the gas (air) that flows out of the heating element 4 and contains the vapor of the article 9 to be heated easily expands in volume toward the outflow side 6. As a result, similarly to the above, this volume expansion can greatly reduce the influence of the vapor of the article 9 to be heated on the supply of the article 9 to the heating element 4. In addition, since the opening 11 has a configuration that does not have a barrier therein, the gas of the article 9 to be heated heated inside the heating element 4 is very easy to escape toward the outflow side 6. The gas containing the vapor | steam of the to-be-heated material 9 heated escapes from the outflow side 6 by volume expansion. As a result, the space on the outflow side 6 of the heating element 4 is in a state where the gas density is lower and the atmospheric pressure is lower than the space outside the outflow side 6. Ascending air current is generated in the opening 11 on the outflow side 6 of the heating element 4. Therefore, the density of the gas (air) inside the opening 11 is lowered. As a result, the supply of the object to be heated 9 from the inflow side 5 of the heating element 4 is promoted, and a decrease in the supply amount of the object to be heated 9 due to volume expansion that is somewhat affected can be compensated.

  The heating element 4 shown in FIG. 6 has an opening 11 on the outflow side 6 as in the configuration of FIG. In the cross section perpendicular to the direction from the inflow side 5 to the outflow side 6 of the heating element 4, the area occupied by the flow passage 10 on the outflow side 6 is larger than that of the inflow side 5. Examples of the configuration of such a flow passage 10 include the configurations shown in FIGS. Needless to say, the configuration of the heating element 4 shown in FIG.

[Embodiment 2]: Other Configuration Example of Heating Device The following describes another embodiment of the present invention with reference to FIG. FIG. 7 is a cross-sectional view showing a schematic configuration of the heating apparatus 1 according to the present embodiment.

  Unlike the heating device 1 according to the first embodiment, the heating device 1 according to the present embodiment has a configuration that does not include the pump 7 for supplying the heating object 9 to the heating element 4. In the heating device 1 shown in FIG. 7, the heating element 4, the heating coil housing 2, and the heating coil 3 are arranged so that the inflow side 5 is downward and the outflow side 6 is upward. Further, the end portion on the inflow side 5 of the heating element 4 is disposed so as to protrude downward from the heating coil 3, and a part thereof is immersed in the heated object 9 stored in the liquid tank 8. In order to efficiently flow the heated object 9 from the end (lower end) of the inflow side 5 of the heating element 4, between the end of the inflow side 5 of the heating element 4 and the bottom surface of the liquid tank 8, It is desirable to provide a space for the article to be heated 9 to enter the end of the inflow side 5 of the heating element 4. Such a space is formed by inserting a spacer member between the end of the inflow side 5 of the heating element 4 and the bottom surface of the liquid tank 8, or the end of the inflow side 5 of the heating element 4 or the liquid tank 8. It is provided by providing a protrusion on the bottom surface and forming a protrusion shape.

  Further, the flow passage 10 of the heating element 4 has an area occupied by the flow passage 10 on the outflow side 6 in the cross section perpendicular to the direction from the inflow side 5 to the outflow side 6 as in the first embodiment. Larger than side 5.

  In the heating device 1 according to the present embodiment, the object to be heated 9 is supplied from the inflow side 5 of the heating element 4 to the inside of the heating element 4 using a capillary phenomenon via the plurality of flow paths 10.

  Here, the suction height of the liquid due to the capillary phenomenon will be described by taking as an example the case where the heated object 9 is water. If the contact angle of water (the object to be heated 9) with respect to the heating element 4 is 45 degrees and the hole radius of the flow passage 10 on the inflow side 5 of the heating element 4 is 0.5 mm, the water passes through the flow passage 10 and is 210 mm. Can rise to the height of Therefore, if the height of the heating element 4 (from the inflow side 5 to the outflow side 6) is about 200 mm, it can be said that the water as the heated object 9 rises from the inflow side 5 to the outflow side 6 of the heating element 4. .

  As described above, according to the heating device 1 according to the present embodiment, by appropriately setting the hole radius of the flow passage 10 on the inflow side 5, the heating object 9 can be heated without using the pump 7. It becomes possible to supply inside.

  In the heating apparatus 1 according to this embodiment, if the hole radius of the flow passage 10 on the inflow side 5 is reduced, the suction height of the heated object 9 into the heating element 4 increases, and the supply amount of the heated object 9 Will increase. On the other hand, the amount of the heated object 9 that can be supplied per unit time becomes smaller as the hole radius of the flow passage 10 on the inflow side 5 is smaller. Therefore, it is desirable to design so as to increase the number of flow passages 10 by increasing the diameter of the heating element 4 or the like according to the use application of the heating device 1.

  In the heating apparatus 1 according to the present embodiment, the heated object 9 is sucked into the heating element 4 and at least reaches the level of the end (lower end) of the inflow side 5 in the heating coil 3, the sucked heated object 9 is heated by electromagnetic induction heating, and a part or all of it is vaporized and discharged toward the outflow side 6. At this time, as described above, the flow passage 10 on the outflow side 6 is larger in cross-sectional area, hole diameter, or number of holes than the flow passage 10 on the inflow side 5. That is, the flow path 10 of the heating element 4 has an area occupied by the flow path 10 on the outflow side 6 in the cross section perpendicular to the direction from the inflow side 5 to the outflow side 6 as in the first embodiment. Larger than side 5. For this reason, the vapor | steam of the to-be-heated object 9 volume-expanded inside the heat generating body 4 by heating becomes easy to flow out to the outflow side 6 which is upper part. As a result, according to the heating device 1 according to the present embodiment, it is possible to reduce the hindrance to the rise of the article 9 to be heated due to the capillary phenomenon due to volume expansion. Further, in the heating device 1 according to the present embodiment, as in the first embodiment, the space on the outflow side 6 of the heating element 4 has a lower gas density and an atmospheric pressure than the space outside the outflow side 6. It is in a low state. Ascending air current is generated in the opening 11 on the outflow side 6 of the heating element 4. Therefore, it is possible to reduce the amount of supply of the object to be heated 9 due to volume expansion, or it is possible to promote the suction of the object to be heated 9 due to capillary action.

  Note that the suction height of the object 9 to be heated due to the capillary phenomenon is also related to the contact angle between the heating element 4 and the object 9 to be heated. For this reason, it is also effective to control the contact angle by applying a hydrophilic treatment to the heating element 4 in order to increase the suction height due to the capillary phenomenon.

[Embodiment 3]: Other Configuration Example of Heating Element Still another embodiment of the present invention will be described below with reference to FIGS. FIG. 8 is a cross-sectional view illustrating a schematic configuration of the heating element 4 provided in the heating apparatus 1 according to the present embodiment.

  The heating apparatus 1 according to the present embodiment is different from those of the first and second embodiments in that the heating element 4 includes an outer peripheral member 14 and an inner member 15. The outer peripheral member 14 is provided so as to surround the side surface of the cylindrical inner member 15. The outer peripheral member 14 does not include the flow passage 10 for circulating the article 9 to be heated. That is, the outer peripheral member 14 is not configured to actively circulate the article 9 to be heated. On the other hand, the inner member 15 is provided with a flow passage 10 through which the heated object 9 can flow in and out from the inflow side 5 toward the outflow side 6.

  The inner member 15 is provided so that the end portion on the inflow side 5 is located at the same position as the end portion on the inflow side 5 in the outer peripheral member 14. Further, the end on the outflow side 6 of the inner member 15 is on the inflow side 5 than the end of the outflow side 6 of the outer peripheral member 14. For this reason, in the heating element 4, the opening 11 is formed by the inner peripheral surface of the outer peripheral member 14 and the end surface of the inner member 15 on the outflow side 6.

  By the way, in the heating by electromagnetic induction, an alternating current is passed through the heating coil 3 and a continuous magnetic flux is passed through the heating element 4, and an eddy current flowing along therewith, and a hysteresis loss is used when the heating element 4 is a magnetic body. Heating. The frequency of a general alternating current is determined according to the material of the heating element 4 and the output such as a necessary heating temperature, and is several tens of kHz or more. Such high-frequency eddy currents are affected by the skin effect in which current flows only near the surface of the conductor. Therefore, the outer peripheral portion may be heated intensively due to the eddy current flowing in the outer peripheral portion intensively with respect to the heating element 4.

  Therefore, according to the heating device 1 according to the present embodiment, since the outer peripheral member 14 that does not include the flow passage 10 is provided on the outer periphery of the heating element 4, the magnetic permeability is increased and electromagnetically induced magnetic flux is generated. It becomes easy to concentrate on the outer peripheral member 14 and a large eddy current flows. As a result, the heating device 1 that can efficiently perform electromagnetic induction heating can be realized.

  The inner member 15 is preferably fixed in close contact with the outer peripheral member 14 having a cylindrical shape, for example, by press fitting or the like. Thus, heat generated from the outer peripheral member 14 can be easily transmitted to the inner member 15.

  Furthermore, as described above, on the outflow side 6 of the heating element 4, the opening 11 is formed by the inner peripheral surface of the outer peripheral member 14 and the end surface of the inner member 15 on the outflow side 6. For this reason, as described in the first embodiment, the gas containing the vapor of the article 9 to be heated is likely to flow out to the outflow side 6 by volume expansion.

  Moreover, it is preferable that the inner member 15 is comprised with the metal fiber. In this case, the heating element 4 shown in FIG. 8 can be manufactured by inserting an inner member 15 formed by compressing metal fibers into a cylindrical outer peripheral member 14, for example. In the configuration shown in FIG. 8, the outer diameter of the heating element 4 is determined by the outer peripheral member 14. For this reason, it is not necessary to accurately compression-mold the inner member 15 made of metal fibers. Therefore, the processing and assembly of the heating element 4 can be simplified and made inexpensive.

  FIG. 9 is a cross-sectional view showing another configuration of the heating element 4 provided in the heating apparatus 1 according to the present embodiment. In the heating element 4 shown in FIG. 9, the inner member 15 has a three-layer structure including a first inner member 16, a second inner member 17, and a third inner member 18. In addition, of the first inner member 16, the second inner member 17, and the third inner member 18, the ratio that the first inner member 16 occupies most (that is, the volume or the number (when the dimensions are constant)). Is small, and the ratio (that is, the volume or the number (when the dimension is constant)) occupied by the third inner member 18 is the largest.

  Further, in the configuration shown in FIG. 9, since the outer peripheral member 14 not provided with the flow passage 10 is provided on the outer periphery of the heating element 4, the magnetic permeability is increased, and the electromagnetically induced magnetic flux is generated by the outer peripheral member 14. It becomes easy to pass through to the center and a large eddy current flows. As a result, the heating device 1 that can efficiently perform electromagnetic induction heating can be realized.

  Further, the proportion of the flow passage 10 formed in each inner member increases in the order of the first inner member 16, the second inner member 17, and the third inner member 18. For this reason, as described in the first embodiment, the gas containing the vapor of the article 9 to be heated easily escapes to the outflow side 6 by volume expansion.

  Furthermore, on the outflow side 6 of the heating element 4, an opening 11 is formed by the inner peripheral surface of the outer peripheral member 14 and the end surface of the inner member 15 on the outflow side 6. For this reason, as described in the first embodiment, the gas containing the vapor of the article 9 to be heated is likely to flow out to the outflow side 6 by volume expansion.

  Moreover, it is preferable that the 1st inner member 16, the 2nd inner member 17, and the 3rd inner member 18 are closely fixed by press-fitting etc. in the cylindrical outer peripheral member 14, for example. Accordingly, heat generated from the outer peripheral member 14 is easily transmitted to the first inner member 16, the second inner member 17, and the third inner member 18.

  Moreover, the 1st inner member 16, the 2nd inner member 17, and the 3rd inner member 18 may be comprised with the metal fiber. In this case, the heating element 4 shown in FIG. 9 can be manufactured by the following procedure. That is, first, the third inner member 18 configured by compressing metal fibers is inserted into the cylindrical outer peripheral member 14 from the inflow side 5, for example. Next, from the inflow side 5, the second inner member 17 configured to have a higher degree of metal fiber compression than the third inner member 18 is inserted. Finally, from the inflow side 5, the first inner member 16 configured to have a higher degree of metal fiber compression than the second inner member 17 is inserted. In the heating element 4 manufactured by such a procedure, the degree of compression of the metal fibers decreases in the order of the third inner member 18, the second inner member 17, and the first inner member 16. Further, in the configuration shown in FIG. 9, the outer diameter of the heating element 4 is determined by the outer peripheral member 14. For this reason, it is not necessary to accurately compress and mold the first inner member 16, the second inner member 17, and the third inner member 18 made of metal fibers. Therefore, the processing and assembly of the heating element 4 can be simplified and made inexpensive.

  FIG. 10 shows still another configuration example of the heating element 4 provided in the heating device 1 according to the present embodiment, and is a cross-sectional view taken along a plane perpendicular to the direction from the inflow side 5 to the outflow side 6. It is. FIG. 11 is a cross-sectional view showing still another configuration example of the heating element shown in FIG. 10, taken along a plane perpendicular to the direction from the inflow side 5 to the outflow side 6.

  In the heating element 4 shown in FIG. 10, the plurality of flow passages 10 have substantially the same hole diameter. The flow passage 10 is concentrated in the central portion of the heating element 4. That is, in the radial direction of the heating element 4, the number of the flow passages 10 increases from the outer periphery toward the center. According to this configuration, the outer periphery of the heating element 4 can be efficiently heated by the electromagnetic induction, and the heat can be transmitted to the object to be heated passing through the flow passage 10.

  Further, in the heating element 4 shown in FIG. 11, the plurality of flow passages 10 have different hole diameters. And the hole diameter of the flow path 10 formed in the outer periphery of the heat generating body 4 is small, and the hole diameter of the flow path 10 formed in the center part of the heat generating body 4 is large. In other words, in the radial direction of the heating element 4, the flow passage 10 has a hole diameter that increases from the outer periphery toward the center. According to this configuration, similarly to the configuration of FIG. 10, the outer periphery of the heating element 4 can be efficiently heated by the electromagnetic induction, and the heat can be transmitted to the heated object passing through the flow passage 10. In particular, by using a heat conductive material such as iron or stainless alloy as the material of the heating element 4, heat is instantaneously transmitted to the internal flow passage 10 through which the heated object 9 passes, and the heated object 9. Is effectively heated.

  As described above, according to the present invention, in the heating device 1 that heats the liquid heated object 9 and generates steam, a part or all of the heated object 9 is vaporized inside the heating element 4 to expand the volume. Even so, it is possible to reduce the influence of a decrease in the supply amount of the article 9 to be heated due to the volume expansion. Furthermore, the effect by an updraft and a capillary phenomenon can be enjoyed effectively. In addition, impurities such as scale contained in the article 9 to be heated can reduce the probability of adhesion of the heating element 4 to the flow passage 10. Therefore, it is possible to provide the heating apparatus 1 that can supply the article 9 to be heated stably and reliably.

[Summary]
A heating device 1 according to aspect 1 of the present invention includes a heating coil housing 2 around which a heating coil 3 is wound, and a heating element 4 disposed in the heating coil housing 2, and The heating element 4 is provided with a plurality of flow passages 10 through which the heated object 9 passes from one side (inflow side 5) in the winding axis direction of the heating coil 3 to the other side (outflow side 6). In the heating device 1 that heats the liquid heated object 9 from one side (inflow side 5) of the flow passage 10 and out of the other side (outflow side 6), the heating element 4 in the heating element 4 is heated. In the cross section perpendicular to the winding axis direction, the total cross-sectional area occupied by the first flow passage 10 on the outflow side 6 is larger than the total cross-sectional area occupied by the second flow passage 10 on the inflow side 5. is there.

  According to the above configuration, the ratio of the total cross-sectional area of the flow passage 10 to the cross-sectional area of the heating element 4 is small on the inflow side 5 and large on the outflow side 6. Therefore, even if the article 9 to be heated is heated after flowing into the heating element 4 and partially or entirely becomes steam and the volume expands, according to the above configuration, the first flow passage 10 on the outflow side 6 occupies. Since the total cross-sectional area is larger than the total cross-sectional area occupied by the second flow passage 10 on the inflow side 5, the article 9 to be heated easily expands to the outflow side 6. As a result, according to the above configuration, it is possible to reduce the influence of the increase in atmospheric pressure on the inflow side 5 and to suppress the problem that the supply amount of the heated object 9 to the heating element 4 decreases.

  Moreover, according to said structure, the fluctuation | variation of the temperature of the liquid to-be-heated object 9 flowing out with the fluctuation | variation of the supply amount of the to-be-heated liquid object 9 in the heating apparatus 1 can be made small. Therefore, the stability and reliability of the heating device 1 can be improved.

  Further, the total cross-sectional area occupied by the first flow passage 10 on the outflow side 6 is larger than the total cross-sectional area occupied by the second flow passage 10 on the inflow side 5, and thus is included in the liquid heated object 9. Impurities such as scale are trapped inside the heating element 4 and the chance of clogging the flow passage 10 can be reduced.

  As described above, according to the above-described configuration, the supply amount and the outflow temperature do not change or fluctuate depending on the heating temperature and the amount of steam generated of the article 9 to be heated, and the heating device can reduce the chance that the scale adheres to the heating element. 1 can be provided.

  In the heating device 1 according to aspect 2 of the present invention, the average cross-sectional area occupied by each of the first flow passages 10 in the cross section perpendicular to the winding axis direction in the aspect 1 is the second circulation. The configuration is larger than the average cross-sectional area occupied by each of the paths 10.

  Here, the “average cross-sectional area” means an area obtained by dividing the total cross-sectional area occupied by the flow passage 10 by the number of the flow passages 10 in a cross section perpendicular to the winding axis direction of the heating element 4.

  According to the above configuration, in each flow passage 10, the average cross-sectional area is set so that the inflow side 5 is small and the outflow side 6 is large. Even in such a configuration, the heated object 9 is easily expanded to the outflow side 6 when the heated object 9 is heated after flowing into the heating element 4 and part or all of the heated object 9 becomes steam and the volume expands. . As a result, according to the above configuration, it is possible to reduce the influence of the increase in atmospheric pressure on the inflow side 5 and to suppress the problem that the supply amount of the heated object 9 to the heating element 4 decreases. Furthermore, it is possible to reduce the chance of clogging of the flow path 10 because impurities such as scale contained in the liquid object 9 are trapped inside the heating element 4.

  Further, in the cross section perpendicular to the winding axis direction, when the cross-sectional areas of the individual flow passages 10 are different between the inflow side 5 and the outflow side 6, the heating element 4 in the heating device 1 according to the aspect 2 of the present invention. Examples of the flow path 10 include a tapered hole formed so that the hole diameter increases from the inflow side 5 toward the outflow side 6. In the configuration in which the flow passage 10 is a tapered hole, the effect of sucking up the liquid heated object 9 by the capillary phenomenon of the flow passage 10 is increased on the inflow side 5 of the heating element 4. For this reason, there exists an effect that the supply capability to the inside of the heat generating body 4 of the to-be-heated material 9 improves.

  In addition, in the heating device 1 according to the aspect 3 of the present invention, the total cross-sectional area occupied by the flow passage 10 in the cross section perpendicular to the winding axis direction of the heating element 4 in the aspect 1 or 2 is the inflow side. The configuration increases from 5 to the outflow side 6.

  According to said structure, supply_amount | feed_rate and outflow temperature do not change and fluctuate with the heating temperature of the to-be-heated material 9 and the amount of steam generation, and the opportunity for a scale to adhere to a heat generating body can be reduced.

  In the heating device 1 according to the aspect 4 of the present invention, in any one of the aspects 1 to 3, the heating element 4 is longer than the winding length of the heating coil 3, and the heating element 4 in the heating element 4 The first flow passage 10 is formed at an end portion of the outflow side 6 and is provided as an opening portion 11 communicating with the plurality of second flow passages 10, and the opening portion 11 includes at least one of the opening portions 11. It is the structure provided so that a part may be settled in the winding area 13 of the said heating coil 3. FIG.

  According to the above configuration, since the opening 11 that communicates with the plurality of flow passages 10 on the inflow side 5 is formed on the outflow side 6 of the heating element 4, the heated object 9 is connected to the heating element 4. After the inflow, it is heated and part or all becomes steam, the volume expands, and flows out from the opening 11. Here, since there is no barrier in the space in the opening 11 that blocks the flow of the heated object 9 that has become a gas, the heated object 9 can easily escape to the outflow side 6 due to volume expansion due to the generation of steam, Airflow is generated from the inflow side to the outflow side. And the outflow of the to-be-heated material 9 containing a vapor | steam is accelerated | stimulated by this airflow. Therefore, according to said structure, even if the to-be-heated material 9 flows into the heat generating body 4 and is heated and a part or all becomes a vapor | steam and a volume expands, the supply amount to the heat generating body 4 of the to-be-heated material 9 Can be prevented from deteriorating.

  The heating device 1 according to the fifth aspect of the present invention is the heating device 1 according to any one of the first to fourth aspects, wherein the end of the inflow side 5 of the heating element 4 is immersed in the liquid heated object 9. It is the composition which is.

  According to said structure, since the edge part of the said inflow side 5 in the said heat generating body 4 is immersed in the said liquid to-be-heated object 9, without using the supply means of the to-be-heated object 9, such as a pump, The object to be heated 9 can flow into the heating element 4. Therefore, according to said structure, the heating apparatus 1 of the cheap structure which is not provided with the supply means of the to-be-heated objects 9, such as a pump, can be provided.

  The heating device 1 according to Aspect 6 of the present invention is the heating device 1 according to any one of the Aspects 1 to 5, in which the flow passage 10 occupies a cross section perpendicular to the winding axis direction of the heating element 4. The cross-sectional area is configured to increase from the outer peripheral side toward the central side.

  In the electromagnetic induction heating, electromagnetic induction is performed by flowing a high-frequency current through the heating coil 3. Such high-frequency current is affected by the skin effect in which current flows only near the surface of the conductor. Therefore, the outer peripheral portion may be heated intensively due to the eddy current flowing in the outer peripheral portion intensively with respect to the heating element 4.

  So, according to said structure, in the cross section perpendicular | vertical with respect to the said winding-axis direction in the said heat generating body 4, the total cross-sectional area which the said flow path 10 occupies becomes large as it goes to the center side from the outer peripheral side. . That is, the total cross-sectional area occupied by the material of the heating element 4 increases from the center side toward the outer periphery side. As described above, by increasing the material density of the heating element 4 on the outer periphery, more eddy current can be caused to flow in the heating element 4 by the electromagnetic induction action, and the heat generation property can be improved.

  The heating device 1 according to Aspect 7 of the present invention is the heating device 1 according to any one of the Aspects 1 to 6, wherein the heating element 4 includes an outer cylindrical member (outer peripheral member 14) in which the flow passage 10 is not formed, The inner member 15 is inserted into the outer cylinder member (outer peripheral member 14) and the flow passage 10 is formed.

  According to said structure, the outer cylinder member (outer peripheral member 14) with a high material density is used as a member of the outer peripheral part of the heat generating body 4, and the inside in which the to-be-heated material 9 can distribute | circulate as a member inside the heat generating body 4 By using the material 15, it is possible to easily manufacture the heating element 4 in which the total cross-sectional area occupied by the flow passage 10 increases from the outer peripheral side toward the central side. Therefore, according to said structure, the cost reduction of the heating apparatus 1 is realizable.

  Moreover, the heating apparatus 1 which concerns on the aspect 8 of this invention WHEREIN: In any one aspect of the said aspects 1-7, the said heat generating body 4 has the number of the said flow paths 10 in the outflow side 6 compared with the inflow side 5. There may be more configurations. Moreover, the heating apparatus 1 which concerns on the aspect 9 of this invention WHEREIN: In any one aspect of the said aspects 1-7, the said heat generating body 4 is the outflow compared with the inflow side 5 in the hole diameter of each flow path 10. The side 6 may have a larger configuration.

  Moreover, the heating apparatus 1 which concerns on the aspect 10 of this invention WHEREIN: In any one aspect of the said aspects 1-7, the said heat generating body 4 is comprised with the porous metal (for example, metal fiber), The outflow side 6 The porosity of the porous metal may be larger than the porosity of the porous metal on the inflow side 5.

  In addition, the heating device 1 according to the eleventh aspect of the present invention is the configuration in the first to tenth aspects, in which the heating element 4 has a layer structure in which a plurality of elements are stacked in the winding axis direction. May be.

  Furthermore, in the heating device 1 according to the aspect 12 of the present invention, in the aspect 7, the inner member 15 is configured by compressing metal fibers, and the inner member 15 includes a plurality of inner member elements (first elements). The inner member 16, the second inner member 17, and the third inner member 18) have a layer structure in which the inner member element is laminated in the winding axis direction, and the inner member element is moved from the inflow side 5 to the outflow side 6. The structure provided so that the compression degree of a metal fiber may become high may be sufficient as it goes.

(Supplement)
The heating device according to the present invention can also be expressed as follows.

  (1) A heating coil, a heating coil casing around which the heating coil is wound, and a heating element disposed in the heating coil casing are provided, and an object to be heated passes in the direction of the heating coil winding axis of the heating element. In a heating apparatus provided with a plurality of possible flow passages and heating a liquid object to be heated from one of the flow passages and from the other, the total number of flow passages of the heating element in the cross section perpendicular to the heating coil winding axis A heating device characterized in that the cross-sectional area is larger on the outflow side than on the inflow side.

  (2) The average cross-sectional area of the individual flow passages on the outflow side in the cross section perpendicular to the heating coil winding axis is larger than the average cross-sectional area of the individual flow passages on the outflow side. Heating device.

  (3) The heating element is longer than the winding length of the heating coil, the outflow side of the heating object of the heating element has an opening shape, and at least a part of the opening is hooked on the heating coil winding section. The heating device according to (1) or (2).

  (4) The heating apparatus according to any one of (1) to (3), wherein a part of the heating part inflow side of the heating object is immersed in a liquid heating object.

  (5) The heating device according to any one of (1) to (4), wherein the radial outer periphery of the heating element has a smaller total area of the flow path than the inside.

  (6) The heating element includes a heating element outer cylinder that is cylindrical and has no flow path, and a heating element absorbing liquid that is provided with a plurality of flow paths that are inserted into the outer cylinder and that allow liquid to pass therethrough. The heating apparatus according to any one of (1) to (5).

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The configuration shown in FIG. 7 was adopted as the heating device 1 and the configuration shown in FIG. 8 was adopted as the heating element 4 to confirm the effect.

  Water was used as the article 9 to be heated. The heating element 4 used has a cylindrical shape and an inner diameter of 40 mm. Further, steel fibers were used as the inner member 15 and the porosity was about 50%. Moreover, the electric power input into the heating coil 3 was 500 W, and the heating frequency was 20 kHz.

  Further, as an example, a configuration was adopted in which the inner member 15 was inserted from the lower end of the outer peripheral member 14 to a height of ½, and the remaining ½ portion above that became the opening 11. In the configuration of the embodiment, the opening 11 corresponds to the flow passage 10 on the outflow side 6. Further, as a comparative example, a configuration in which the inner member 15 is inserted into the entire inside of the outer peripheral member 14 is employed. The configuration of the comparative example has a configuration in which the area occupied by the flow passage 10 does not change in the cross section of the inflow side 5 and the outflow side 6 of the heating element 4. The effect was confirmed in the structure of the said Example and the structure of the said comparative example. As a result, in the configuration of the above example, the generated steam was about 250 cc / hour, whereas in the configuration of the comparative example, the generated steam was about 190 cc / hour.

  From this result, it can be seen that the steam generation amount is increased by about 30% in the configuration of the above embodiment compared to the configuration of the comparative example, and the decrease in the supply amount of the heated object 9 to the heating element 4 is suppressed. I was able to confirm that

  The electromagnetic induction heating type heating apparatus that heats a liquid can be applied to a heating apparatus that is required to stably supply a liquid while suppressing fluctuation and lowering of the supply amount of the liquid.

DESCRIPTION OF SYMBOLS 1 Heating device 2 Heating coil housing | casing 3 Heating coil 4 Heating body 5 Inflow side 6 Outflow side 7 Pump 8 Liquid tank 9 Heated object 10 Flow path 11 Opening part 12 Inner bottom face 13 Rolling area 14 Outer peripheral member 15 Inner member

Claims (5)

A heating coil housing around which a heating coil is wound,
A heating element disposed in the heating coil housing,
The heating element is provided with a plurality of flow passages through which the heated object passes from one side to the other side in the winding axis direction of the heating coil, and the liquid heated object passes through one of the flow paths. In the heating device that flows in from the other side and heats by flowing out from the other side,
In the cross section perpendicular to the winding axis direction of the heating element, the total cross-sectional area occupied by the outflow side first flow passage is larger than the total cross-sectional area occupied by the inflow side second flow passage. A heating device characterized by.   The average cross-sectional area occupied by each of the first flow paths in a cross section perpendicular to the winding axis direction is larger than the average cross-sectional area occupied by each of the second flow paths. The heating apparatus according to 1. The heating element is longer than the winding length of the heating coil,
The first flow path in the heating element is formed at the end on the outflow side, and is provided as an opening that communicates with the plurality of second flow paths.
The heating apparatus according to claim 1 or 2, wherein the opening is provided so that at least a part of the opening fits in a winding area of the heating coil.   The heating device according to any one of claims 1 to 3, wherein an end portion on the inflow side of the heating element is immersed in the liquid heated object.   In the cross section perpendicular to the winding axis direction of the heating element, the total cross-sectional area occupied by the flow passage increases from the outer peripheral side toward the central side. The heating device according to any one of the above.