JP2018045804A - Fluid heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a contact area between a conductor tube and a fluid by eliminating the need for an electrical connection member for causing a short circuit of the spirally wound conductor tube.SOLUTION: A fluid heating device that heats a fluid, flowing in a conductor tube 3, by heating the conductor tube 3 by electromagnetic induction comprises: two first conductor tubes 31a, 31b spirally wound so as to be parallel in an axial direction; and two second conductor tubes 32a, 32b spirally wound so as to be parallel in the axial direction. A two-layer structure is formed by making the winding diameter of the first conductor tubes 31a, 31b and the winding diameter of the second conductor tubes 32a, 32b different from each other. The winding direction of the first conductor tubes 31a, 31b and the winding direction of the second conductor tubes 32a, 32b are different from each other. The one first conductor tube 31a and the one second conductor tube 32a, and the other first conductor tube 31b and the other second conductor tube 32b, are electrically connected at both ends 31m, 31n, respectively, so as to allow circulation of a fluid.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fluid heating apparatus that heats a fluid such as water using a conductor tube that generates heat by electromagnetic induction.

  As a conventional fluid heating device, for example, as shown in Patent Document 1, there is one in which a primary coil is wound around a closed magnetic circuit iron core and a conductor tube through which a fluid flows is spirally wound as a secondary coil. Here, in order to reduce the electrical reactance and improve the heating efficiency, the conductor tube is electrically connected by welding or the like with an electrical connection member extending in the axial direction of the spiral on the outer peripheral surface of the conductor tube. And it is comprised so that a short circuit may be formed in a conductor pipe. In this fluid heating apparatus, an AC voltage is applied to the primary coil to cause a short-circuit current to flow in the conductor tube, thereby heating the fluid by causing the conductor tube to generate Joule heat.

  However, if the electrical connection member is fixed to the conductor tube, a large stress is generated when the Joule-heated conductor tube is about to be thermally deformed, and the conductor tube and the electrical connection member, or the conductor tube and the electrical connection member, There is a risk that fatigue will accumulate or breakage at the fixing points.

  On the other hand, there is a demand for further improving the heating efficiency of the fluid. To that end, it is conceivable to increase the contact area between the conductor tube and the fluid. Since it is the structure which fixes an electrical connection member to the outer peripheral surface of a conductor tube, the structure which increases the number of turns in the axial direction of a spiral can be considered in order to enlarge a contact area easily.

  However, increasing the number of windings of the conductor tube increases the axial dimension of the conductor tube, which leads to an increase in the size of the entire fluid heating device. Also, by increasing the number of windings of the conductor tube, the number of fixing points between the conductor tube and the electrical connection member increases, and fatigue accumulates at the conductor tube, the electrical connection member, or the fixing point between the conductor tube and the electrical connection member. Or the possibility of breakage is likely to occur.

JP 2010-71624 A

  Therefore, the present invention has been made to solve the above-described problems, and it eliminates the need for an electrical connection member for short-circuiting a spirally wound conductor tube, while increasing the contact area between the conductor tube and the fluid. Doing that is the main challenge.

  That is, the fluid heating device according to the present invention is a fluid heating device that heats a fluid flowing through the conductor tube by causing the conductor tube to generate heat by electromagnetic induction, and is wound spirally so as to be parallel in the axial direction. Two first conductor tubes and two second conductor tubes wound spirally so as to be parallel in the axial direction, the first conductor tube and the second conductor tube Since the winding diameters of the first conductor tube and the second conductor tube are different from each other, the winding directions of the first conductor tube and the second conductor tube are different from each other. The other first conductor tube and the other second conductor tube are electrically connected at both ends, and are connected so that the fluid can flow therethrough. In the present invention, one short circuit is formed between one of the first conductor tubes and one of the second conductor tubes, and one short circuit is formed between the other of the first conductor tubes and the other of the second conductor tubes. Is done.

In this fluid heating apparatus, the first conductor tube and the second conductor are connected to each other at one end and the other end of the first conductor tube and the second conductor tube whose winding directions are opposite to each other. Since a short circuit is formed between the tubes, an electrical connection member can be dispensed with.
In addition, since it has a two-layer structure composed of two first conductor tubes and two second conductor tubes, and is configured to allow fluid to flow through these first conductor tubes and second conductor tubes, the conductor The contact area between the conductor tube and the fluid can be increased without increasing the number of turns in the axial direction of the tube.
Furthermore, the short-circuit current and the capacity (fluid throughput) can be adjusted by the number of turns of the conductor tube which is the secondary coil.

  In order to make the temperature of the fluid heated by the first conductor tube and the temperature of the fluid heated by the second conductor tube the same, the conductor tube lengths of the first conductor tube and the second conductor tube are substantially the same. It is desirable to be constituted so that. In order to easily realize this configuration, it is conceivable that the number of turns of the first conductor tube is larger than the number of turns of the second conductor tube.

In order to facilitate the piping structure of the introduction port for introducing fluid and the lead-out port for extracting fluid from the conductor tube and the conductor tube, one end of one of the first conductor tubes and one of the second conductor tubes The connecting portion at one end and the connecting portion at one end of the other first conductor tube and the other end of the second conductor tube are connected so that the fluid can flow therethrough, A connection portion of the other end portion of the conductor tube and the other end portion of one of the second conductor tubes, and a connection portion of the other end portion of the other first conductor tube and the other end portion of the other second conductor tube. It is desirable that the fluid is connected so that the fluid can flow therethrough.
If it is this structure, since the two connection parts provided in the one end part are connected, and the two connection parts provided in the other end part are connected, the introduction port is connected to the two connection parts of the one end part. And connecting the lead-out port to the two connecting portions at the other end can facilitate the piping structure.

A fluid heating device is provided between a cylindrical iron core, a magnetic path forming portion provided outside the cylindrical iron core and forming a closed magnetic path together with the cylindrical iron core, and the cylindrical iron core and the magnetic path forming portion. And an induction coil for generating magnetic flux inside the cylindrical iron core, wherein the first conductor tube and the second conductor tube are provided between the cylindrical iron core and the magnetic path forming portion. It is desirable.
If it is this structure, since it is set as the structure which arrange | positions the 1st conductor tube and 2nd conductor tube which are heat sources between a cylindrical iron core and a magnetic path formation part, it will be outside from a 1st conductor tube and a 2nd conductor tube. The leaking heat can be confined inside the magnetic path forming part.

  According to the present invention configured as described above, the contact area between the conductor tube and the fluid can be increased while eliminating the need for an electrical connection member for short-circuiting the spirally wound conductor tube.

It is sectional drawing which shows typically the structure of the fluid heating apparatus which concerns on one Embodiment of this invention. It is a side view which shows the structure of the 1st conductor tube and 2nd conductor tube of the embodiment. It is a side view showing the composition of the 1st conductor tube of the embodiment. It is a side view showing the composition of the 2nd conductor tube of the embodiment. It is a side view which shows the connection aspect of one 1st conductor tube and one 2nd conductor tube of the embodiment. It is a side view which shows the connection aspect of the other 1st conductor tube and the other 2nd conductor tube of the embodiment.

  Hereinafter, an embodiment of a fluid heating device according to the present invention will be described with reference to the drawings.

<1. Device configuration>
The fluid heating apparatus 100 according to the present embodiment heats water, which is a fluid, to generate saturated steam or superheated steam. As shown in FIG. 1, the diameters of the cylindrical iron core 21 and the cylindrical iron core 21 are as follows. A cylindrical outer magnetic path forming portion 22 provided on the outer side in the direction, a first radial magnetic path forming portion 23 connecting the cylindrical iron core 21 and one axial end of the outer magnetic path forming portion 22, and a cylindrical shape. A closed magnetic path core element 2 having an iron core 21 and a second radial magnetic path forming portion 24 that connects the other axial end of the outer magnetic path forming portion 22 is provided. The closed magnetic path core element 2 has a substantially cylindrical shape, and forms a substantially cylindrical space inside its side peripheral wall.

  The cylindrical iron core 21 and the outer magnetic path forming portion 22 are both so-called involute iron cores, and a plurality of silicon steel plates each having a curved portion whose cross section in the width direction is curved in an involute curve shape are radially stacked in the circumferential direction. And formed into a cylindrical shape.

  The fluid heating device 100 is provided between the cylindrical iron core 21 and the outer magnetic path forming portion 22, and heats the fluid flowing through the heat generated by electromagnetic induction, and the cylindrical iron core 21 and the outer side. The induction coil 4 provided between the magnetic path forming portions 22 and generating magnetic flux inside the cylindrical iron core 21 and the first radial magnetic path forming portion 23 provided with a fluid flowing into the conductor tube 3 are flown. A second flow path that is provided in the first flow path forming section 5 that forms the first flow path S1 and the second radial magnetic path formation section 24 and that forms the second flow path S2 through which the fluid flowing into the conductor tube 3 flows. And a forming portion 6.

  In the internal space of the closed magnetic circuit core element 2, portions other than the conductor tube 3 and the induction coil 4 are filled with a heat insulating material 10. Further, the closed magnetic circuit core element 2 includes the conductor tube 3, the induction coil 4, and the heat insulating material 10, and the first radial magnetic path forming portion from the axial direction by the fastening mechanism 13 such as a fastening bolt penetrating in the axial direction. 23 and the 2nd radial direction magnetic path formation part 24 are fastened and integrated.

  As shown in FIG. 2, the conductor tube 3 is wound spirally (coiled) along the outer periphery of the cylindrical iron core 21. The conductor tube 3 is arranged coaxially with the cylindrical iron core 21.

  Specifically, as shown in FIG. 3, the conductor tube 3 includes two first conductor tubes 31 spirally wound so as to be parallel in the axial direction (in order to distinguish both, 31a, 31b) and two second conductor tubes 32 spirally wound so as to be parallel in the axial direction as shown in FIG. 4 (32a and 32b when the two are distinguished) The first conductor tube 31 and the second conductor tube 32 have a two-layer structure because the winding diameters thereof are different from each other. In this embodiment, the winding diameter of the first conductor tube 31 is larger than the winding diameter of the second conductor tube 32, and the first conductor tube 31 and the second conductor tube 32 are configured not to contact each other. The winding directions of the first conductor tube 31 and the second conductor tube 32 are different from each other (reverse directions). Further, the first conductor tube 31 and the second conductor tube 32 have substantially the same tube diameter (inner diameter and outer diameter), and the number of turns of the first conductor tube 31 is larger than the number of turns of the second conductor tube 32. Thus, the lengths of the conductor tubes are substantially the same.

  And, one of the two first conductor tubes 31a and 31b and one of the two second conductor tubes 32a and 32b are electrically connected at both ends thereof, and fluid can flow therethrough. It is connected to the. In addition, the other of the two first conductor tubes 31a and 31b and the other of the two second conductor tubes 32a and 32b are electrically connected at both ends thereof, and fluid can flow therethrough. It is connected to the. Because of these configurations, the two first conductor tubes 31a and 31b and the two second conductor tubes 32a and 32b are respectively wound portions of the spiral portions 31x and 32x in addition to the spiral portions 31x and 32x. And it has connection pipe parts 31y and 32y connected to connecting parts 33 and 34, which will be described later, at the winding end part (see FIGS. 3 and 4).

  Specifically, as shown in FIGS. 5 and 6, one end 31m of the first conductor tube 31 and one end 32m of the second conductor tube 32 are connected to one end side connecting portion 33 such as a connecting pipe having conductivity. In the case of distinction, they are electrically connected and fluidly connected by 33a, 33b). The other end portion 31n of the first conductor tube 31 and the other end portion 32n of the second conductor tube 32 are electrically connected by the other end side connection portion 34 such as a conductive connection pipe (34a and 34b in the case of distinguishing both). Connected and fluidly connected. These connecting portions 33 and 34 are branched paths for diverting the fluid to the first conductor tube 31 and the second conductor tube 32 or the fluids flowing through the first conductor tube 31 and the second conductor tube 32 are joined together. It has a combined flow path inside.

  As shown in FIG. 5, one end-side connecting portion 33a which is a connecting portion 33 of one end portion 31m of one first conductor tube 31a and one end portion 32m of one second conductor tube 32a, and the other first conductor The one end 31m of the tube 31b and the other one end side connecting portion 33b which is the connecting portion 33 of the one end 32m of the other second conductor tube 32b are connected to each other so that fluid can flow therethrough.

  Also, as shown in FIG. 6, one other end side connection portion 34a which is a connection portion 34 of the other end portion 31n of one first conductor tube 31a and the other end portion 32n of one second conductor tube 32a, The other end side connection part 34b which is the connection part 34 of the other end part 31n of the other 1st conductor pipe | tube 31b and the other end part 32n of the other 2nd conductor pipe | tube 32b is connected so that a fluid can mutually flow. Has been. In the present embodiment, as shown in FIG. 2, one end-side connection portion 33 a and the other end-side connection portion 33 b are connected by an intermediate pipe 35, and the other end-side connection portion 34 a The other end side connection part 34b is connected by the intermediate pipe 36, so that fluids can flow through each other.

  In the present embodiment, the fluid is introduced from one end side connection portion 33 a and flows into the other end side connection portion 33 b through the intermediate pipe 35. In addition, the downstream end part of the inner side hollow coil element 42 is connected to one one end side connection part 33a.

  The fluid that has flowed into the one end-side connection portion 33a branches and flows into one first conductor tube 31a and one second conductor tube 32a. The fluid that has flowed into the other one end side connection portion 33b branches and flows to the other first conductor tube 31b and the other second conductor tube 32b.

  The fluid that has flowed through one first conductor tube 31a and one second conductor tube 32a merges at one other end side connection portion 34a to derive the fluid. The fluid that has flowed through the other first conductor tube 31b and the other second conductor tube 32b joins at the other end side connection portion 34b and flows to the other end side connection portion 34a through the intermediate pipe 36. The derivation port 12 is connected to one other end side connection part 34a.

  As shown in FIG. 1, the induction coil 4 includes an outer hollow coil element 41 and an inner hollow coil element 42 made of a hollow conductor tube through which a fluid flowing into the conductor tube 3 flows, and a solid coil element 43 made of a solid conductor. have. These coil elements 41 to 43 are arranged coaxially with the cylindrical iron core 21.

  The outer hollow coil element 41 is disposed between the outer magnetic path forming portion 22 and the conductor tube 3, that is, on the radially outer side of the conductor tube 3. Further, the outer hollow coil element 41 is configured by winding a hollow conductor tube within a range located on the inner side of both end portions in the axial direction of the conductor tube 3 in order to simplify the piping configuration in the closed magnetic circuit core element 2. ing. In FIG. 1, the outer hollow coil element has a single-layer winding, but it may have two or more layers. Here, an insulating material 11 a is provided between the outer hollow coil element 41 and the conductor tube 3. Specifically, the insulating material 11 a is provided along the inner peripheral surface of the outer hollow coil element 41.

  The inner hollow coil element 42 is disposed between the conductor tube 3 and the cylindrical iron core 21, that is, on the radially inner side of the conductor tube 3 (second conductor tubes 32a and 32b). Further, the inner hollow coil element 42 is configured by winding the hollow conductor tube over the entire axial end portions of the cylindrical iron core 21, that is, within a range located outside the both end portions in the axial direction of the conductor tube 3. Has been. In FIG. 1, the inner hollow coil element 42 is a single-layer winding, but it may be a two-layer winding or more. Here, an insulating material 11b is provided between the inner hollow coil element 42 and the conductor tube 3 (see FIG. 1). Specifically, the insulating material 11 b is provided along the inner peripheral surface of the conductor tube 3. An insulating material 11 c is provided between the inner hollow coil element 42 and the cylindrical iron core 21. Specifically, the insulating material 11 c is provided along the inner peripheral surface of the inner hollow coil element 42.

  The solid coil element 43 is wound around the outer periphery of the outer hollow coil element 41. Similarly to the outer hollow coil element 41, the solid coil element 43 is formed by winding a hollow conductor tube within a range located on the inner side of both end portions in the axial direction of the conductor tube 3. Here, an insulating material 11d is provided between the solid coil element 43 and the outer magnetic path forming portion 22, and an insulating material 11e is provided between the solid coil element 43 and the outer hollow coil element 41 ( (See FIG. 1). Specifically, the insulating material 11 d is provided along the outer peripheral surface of the solid coil element 43, and the insulating material 11 e is provided on the inner peripheral surface of the solid coil element 43 and the outer peripheral surface of the outer hollow coil element 41. It is provided along.

  The upstream end (right end) of the outer hollow coil element 41 and the right end of the solid induction coil element 43 are electrically connected. An external terminal T1 to which one power supply terminal of the AC power supply is connected is provided at the left end of the solid induction coil element 43.

  Further, the downstream end (left end) of the outer hollow coil element 41 and the upstream end (left end) of the inner hollow coil element 42 are connected, and the fluid that flows through the outer hollow coil element 41 flows. The inner hollow coil element 42 is configured to flow. An external terminal T2 to which the other power supply terminal of the AC power supply is connected is provided at the downstream end of the inner hollow coil element 42.

  Furthermore, the downstream end portion (right end portion) of the inner hollow coil element 42 and the upstream end portion (right end portion, one end side connection portion 33a) of the conductor tube 3 are connected, and the inner hollow coil element is connected. The fluid that has flowed through the element 42 is configured to flow into the conductor tube 3.

  In the present embodiment, the downstream end portion of the inner hollow coil element 42 is spirally wound along the inner surface of the second radial magnetic path forming portion 24. In addition, the upstream end of the inner hollow coil element 42 may be spirally wound along the inner surface of the first radial magnetic path forming portion 23.

  The first flow path forming part 5 forms an annular first flow path S1 along the outer surface of the first radial magnetic path forming part 23, and fluid is supplied to the first flow path S1 from the outside. An introduction port 7 to be introduced is connected. In the present embodiment, the first flow path S <b> 1 is formed by welding the first flow path forming portion 5 having an annular groove to the outer surface of the first radial magnetic path forming portion 23.

  The second flow path forming part 6 forms an annular second flow path S <b> 2 along the outer surface of the second radial magnetic path forming part 24. In the present embodiment, the second flow path S <b> 2 is formed by welding the second flow path forming portion 6 having an annular groove to the outer surface of the second radial magnetic path forming portion 24.

  The first flow path forming part 5 and the second flow path forming part 6 are connected by a first connection pipe 8. Specifically, the first connection pipe 8 has one end (upstream end) connected to the first flow path forming unit 5 and the other end (downstream end) connected to the second flow path forming unit 6. The first connection pipe 8 is provided through the inside of the closed magnetic path core element 2 having a cylindrical shape, that is, the inside of the cylindrical core 21.

  The second flow path forming portion 6 and the outer hollow coil element 41 are connected by a second connection pipe 9. Specifically, one end (upstream end) of the second connection pipe 9 is connected to the second flow path forming unit 6, and the other end (downstream end) is connected to the upstream end of the outer hollow coil element 41. In the present embodiment, the second connecting pipe 9 is introduced into the closed magnetic path core element 2 through the side wall of the outer magnetic path forming portion 22 (the end on the second radial magnetic path forming portion 24 side). And connected to the outer hollow coil element 41. Note that the second connection pipe 9 may be introduced into the closed magnetic path core element 2 through the second radial magnetic path forming portion 24 and connected to the outer hollow coil element 41.

  In the fluid heating apparatus 100 of the present embodiment configured as described above, by applying an AC voltage from an AC power source to the external terminal T1 of the solid coil element 43 and the external terminal T2 of the inner hollow coil element 42, the solid coil element 43, current flows through the outer hollow coil element 41 and the inner hollow coil element 42, and magnetic flux flows through the closed magnetic circuit core element 2. A short-circuit current flows through the conductor tube 3 by the magnetic flux, and the conductor tube 3 generates Joule heat. Thereby, the fluid flowing through the conductor tube 3 is heated by the conductor tube 3.

  Specifically, since one first conductor tube 31a and one second conductor tube 32a are wound in opposite directions, the induced current flowing in one first conductor tube 31a and one second conductor tube The induced current flowing in 32a is in the opposite direction, short-circuited at the connecting portions 33a and 34a at both ends, and a short-circuit current flows in the first conductor tube 31a and the second conductor tube 32a. Since the other first conductor tube 31b and the other second conductor tube 32b are wound in opposite directions, the induced current flowing in the other first conductor tube 31b and the other second conductor tube 32b flow. The induced current is reversed and short-circuited at the connecting portions 33b and 34b at both ends, and a short-circuit current flows through the first conductor tube 31b and the second conductor tube 32b. In this way, two short circuits are formed in the conductor tube 3.

  Next, the fluid heating mode will be described together with the fluid flow of the fluid heating apparatus 100.

  Water, which is a fluid, is introduced from the introduction port 7 connected to the first flow path forming unit 5. Then, the fluid flows from the introduction port 7 into the first flow path S1 to cool the first radial magnetic path forming portion 23 and is preheated by the first radial magnetic path forming portion 23. Thereafter, the fluid flows through the first connection pipe 8 and flows into the second flow path S <b> 2 to cool the second radial magnetic path forming unit 24 and to preheat by the second radial magnetic path forming unit 24. Is done. The first radial magnetic path forming unit 23 and the second radial magnetic path forming unit 24 are heated by heat transfer from the conductor tube 3.

  The fluid that has flowed through the first flow path S1 and the second flow path S2 in this way flows through the second connection pipe 9 and flows into the outer hollow coil element 41. At this time, the fluid cools the outer hollow coil element 41 and is preheated by the outer hollow coil element 41. The outer hollow coil element 41 is heated by heat transfer from the conductor tube 3 together with heat generated by energization.

  The fluid that has flowed through the outer hollow coil element 41 flows into the inner hollow coil element 42. At this time, the fluid cools the inner hollow coil element 42 and is preheated by the inner hollow coil element 42. The inner hollow coil element 42 is heated by heat transfer from the conductor tube 3 as well as heat generated by energization.

  Then, the fluid preheated by the first radial magnetic path forming portion 23, the second radial magnetic path forming portion 24, the outer hollow coil element 41 and the inner hollow coil element 42 flows into the conductor tube 3. The fluid flowing through the conductor tube 3 is heated by the induction-heated conductor tube 3 to become saturated water vapor or superheated water vapor, and is connected to the downstream end of the conductor tube 3 (one other end side connection portion 34a). 12 to the outside or external piping. The conductor tube 3 passes through the side wall of the outer magnetic path forming portion 22 (the end portion on the first radial magnetic path forming portion 23 side) and is led out of the closed magnetic path core element 2. The conductor tube 3 may be led out of the closed magnetic circuit core element 2 through the first radial magnetic path forming portion 23.

<2. Effects of this embodiment>
According to the fluid heating apparatus 100 configured as described above, the first conductor tube 31 and the second conductor tube 32 whose winding directions are opposite to each other are connected to the one end portions 31m and 32m and the other end portions 31n and 32n. Therefore, since a short circuit is formed between the first conductor tube 31 and the second conductor tube 32, an electrical connection member can be eliminated. In addition, a two-layer structure including two first conductor tubes 31a and 31b and two second conductor tubes 32a and 32b is provided, and fluid is supplied to the first conductor tubes 31a and 31b and the second conductor tubes 32a and 32b. Since it is configured to flow, the contact area between the conductor tube 3 and the fluid can be increased without increasing the number of turns of the conductor tube 3 in the axial direction of the spiral. Furthermore, the short-circuit current and the capacity (fluid throughput) can be adjusted by the number of turns of the conductor tube 3 that is a secondary coil.

  Moreover, in this embodiment, the conductor tube 3 which is a heat source is arrange | positioned in the space formed of the cylindrical iron core 21, the outer side magnetic path formation part 22, and the 1st and 2nd radial direction magnetic path formation parts 23 and 24. Since the configuration is such that the periphery of the conductor tube 3 is cooled by a fluid, the heat leaking outside from the conductor tube 3 can be confined inside the closed magnetic circuit core element 2.

  Specifically, the first and second flow paths S1 and S2, the outer hollow coil element 41 and the inner hollow coil element 42 are arranged so as to surround the conductor tube 3, and the fluid flows in the first flow path S1 and the first flow path S1. After flowing through the two flow paths S2, the outer hollow coil element 41 and the inner hollow coil element 42, it is configured to flow into the conductor tube 3, and thus leaked from the conductor tube 3 to both the radial direction side and the axial direction both sides. The fluid can be preheated using heat. That is, the loss due to heat radiation from the conductor tube 3 can be reduced and the fluid can be efficiently heated.

  Further, the first flow path S1, the second flow path S2, the outer hollow coil element 41, and the inner hollow coil element 42 exhibit a function of blocking heat leaked from the conductor tube 3 to both the radial direction side and the axial direction both sides. Therefore, the thermal safety of the fluid heating device can be improved while reducing the amount of heat insulating material used.

  Further, since the fluid flows through the outer hollow coil element 41 and then into the inner hollow coil element 42, the fluid flowing through the outer hollow coil element 41 has a lower temperature than the fluid flowing through the inner hollow coil element 42. The thermal safety of the device 100 can be further improved.

<3. Modified Embodiment of the Present Invention>
The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the induction coil 4 has the inner hollow coil element 42, but the induction coil 4 may not have the inner hollow coil element 42. In this case, the outer hollow coil element 41 is connected to the conductor tube 3, and the fluid flowing through the outer hollow coil element 41 flows into the conductor tube 3.

  Further, the fluid that flows through the inner hollow coil element 42 may flow through the outer hollow coil element 41. In this case, the second connection pipe 9 connects the second flow path forming unit 6 and the inner hollow coil element 42, and the fluid flowing through the second flow path S 2 flows into the inner hollow coil element 42.

  Further, the solid coil element 43 may be disposed radially inside the outer hollow coil element 41 or radially inside the inner hollow coil element 42.

  In addition, the first flow path forming portion 5 and the second flow path forming portion 6 are disposed between the outer surfaces of the first radial magnetic path forming portion 23 and the second magnetic path forming portion 24 as in the embodiment. You may comprise by the piping through which a fluid flows besides what forms a flow path. In this case, it is considered that the pipes to be the first flow path forming section 5 and the second flow path forming section 6 are provided in contact with the outer surfaces of the first radial magnetic path forming section 23 and the second magnetic path forming section 24. It is done.

  In the above-described embodiment, the fluid that has flowed through the inner hollow coil element 42 is configured to flow to the conductor tube 3. Alternatively, it may flow directly from the introduction port 7 to the conductor tube 3.

  In the above embodiment, the first conductor tube and the second conductor tube are connected by a single connection portion such as a conductive connection pipe, and are electrically and fluidically connected. It is good also as a separate body from the structure connected to this, and the structure connected fluidly. For example, the first conductor tube and the second conductor tube may be connected by a connection pipe having no conductivity, and the end portions of the first conductor tube and the second conductor tube may be connected to each other by a conductive member. .

  In the embodiment, the first conductor tube 31a and the second conductor tube 32a are electrically and fluidly connected, and the first conductor tube 31b and the second conductor tube 32b are electrically and fluidly connected. However, the first conductor tube 31a and the second conductor tube 32b may be electrically and fluidly connected, and the first conductor tube 31b and the second conductor tube 32a may be electrically and fluidly connected.

  In the above embodiment, two first conductor tubes and two second conductor tubes are used. However, three or more first conductor tubes and three or more second conductor tubes are used. You may do it. Also in this case, similarly to the above-described embodiment, one end portions and the other end portions of the first conductor tube and the second conductor tube whose winding directions are opposite to each other are connected. Thereby, three or more short circuits corresponding to the number of conductor tubes are formed.

  In the embodiment, the conductor tube has a two-layer structure. However, a plurality of pairs of the first conductor tube and the second conductor tube of the embodiment may be used to form a multilayer structure of 2n (n is 2 or more) layers.

  A plurality of fluid heating devices of the embodiment may be connected in series. In this case, it is conceivable that the former stage fluid heating device functions as a saturated steam generation unit that generates saturated steam from water, and the latter stage fluid heating device functions as a superheated steam generation unit that generates superheated steam from the saturated steam.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Fluid heating apparatus 21 ... Cylindrical iron core 22 ... Outer magnetic path formation part 23 ... 1st radial direction magnetic path formation part 24 ... 2nd radial direction magnetic path formation part 31 (31a) , 31b) ... first conductor tube 31m ... one end 31n ... other end 32 (32a, 32b) ... second conductor tube 32m ... one end 32n ... other end 33 (33a, 33b) ... one end side connection part 34 (34a, 34b) ... the other end side connection part 4 ... induction coil

Claims (5)

A fluid heating device that heats a fluid flowing through a conductor tube by causing the conductor tube to generate heat by electromagnetic induction,
Two first conductor tubes spirally wound so as to be parallel along the axial direction;
Two second conductor tubes spirally wound so as to be parallel along the axial direction,
The first conductor tube and the second conductor tube have a two-layer structure with different winding diameters,
The winding directions of the first conductor tube and the second conductor tube are different from each other,
One of the first conductor pipe and one of the second conductor pipes, and the other of the first conductor pipe and the other of the second conductor pipes are electrically connected at both ends, and the fluid passes therethrough. Fluid heating device connected to allow flow.   The fluid heating apparatus according to claim 1, wherein the first conductor tube and the second conductor tube are configured to have substantially the same conductor tube length.   The fluid heating apparatus according to claim 2, wherein the number of turns of the first conductor tube is larger than the number of turns of the second conductor tube, so that the conductor tube lengths are substantially the same. One end portion of the first conductor tube and one end portion of the second conductor tube, and one end portion of the other first conductor tube and one end portion of the other second conductor tube Are connected to allow the fluid to flow therethrough,
One end of the first conductor tube and the other end of the second conductor tube, and the other end of the other first conductor tube and the other end of the second conductor tube. The fluid heating apparatus according to any one of claims 1 to 3, wherein the fluid is connected to a connection part of the part so that the fluid can flow therethrough. A cylindrical iron core,
A magnetic path forming portion that is provided outside the cylindrical iron core and forms a closed magnetic path together with the cylindrical iron core;
An induction coil provided between the cylindrical iron core and the magnetic path forming portion and generating a magnetic flux inside the cylindrical iron core;
The fluid heating device according to any one of claims 1 to 4, wherein the first conductor tube and the second conductor tube are provided between the cylindrical iron core and the magnetic path forming portion.