JP5317284B2 - Fluid heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve heating efficiency in this kind of a fluid heating device by using the heat generated by a primary coil in heating of the fluid. <P>SOLUTION: An insulated part of one conductor pipe having a part of the length insulated is wound around a leg core 11 of a closed magnetic circuit core, and a wound conductor pipe 12a is formed, a non-insulated part is wound around an outer periphery of the wound conductor pipe 12a, and a wound conductor pipe 12b is formed, and all rounds or the rounds of each of a plurality of windings of the wound conductor pipe 12b are electrically connected and fixed, and AC voltage is applied to both ends of the insulated wound conductor pipe 12a, and the fluid is made to flow sequentially through the insides of the wound conductor pipe 12a and the wound conductor pipe 12b. Thus, leakage of the fluid can be prevented, and the heat conventionally generated by energizing of the primary coil can be used for heating the fluid. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a fluid heating apparatus.

As a fluid heating device, a primary coil is wound around a leg core of a closed magnetic circuit iron core along the iron core, and a secondary coil comprising a conductor tube is wound around the outer periphery of the primary coil, thereby forming a secondary coil. The fluid flowing through the inside is heated by the heat generated in the conductor tube. FIGS. 7A and 7B are configuration diagrams showing the configuration of such a conventional fluid heating apparatus, where FIG. 7A is a top view, FIG. 7B is a side view, and FIG. 7C is a cross-sectional view of a coil portion.

  In FIG. 7, 1 is an iron core, 2 is a primary coil, 3 is a secondary coil, and 4 is a mother pipe through which circulating fluid flows. The iron core 1 has a closed magnetic circuit having leg iron cores at both ends of the yoke iron core, and the primary coil 2 is wound around the leg iron cores at both ends of the iron core 1. The secondary coil 3 is made of a conductor such as a tubular SUS (stainless steel) in which a through hole is formed, and is wound around the outer periphery of each primary coil 2, and each secondary coil 3 is shown in FIG. As shown in (c), two coils 3-1 and 3-2 are wound in parallel, and both ends of each secondary coil 3 are electrically short-circuited by a short-circuiting conductor (not shown).

The fluid heating device configured as described above is connected together with the flanges 3 a and 3 b provided at the ends of the secondary coils 3 and the flange 4 a of the mother pipe 4 when arranged in the fluid circulation path. The fluid circulating by this connection circulates through the through holes of the secondary coils 3. In the example shown in FIG. 7, each primary coil 2 is connected in parallel, and when a single-phase (U-V) AC voltage is applied to each primary coil 2, the secondary coil 3 passes through a short-circuiting conductor. A short-circuit current flows, and the secondary coil 3 generates resistance by the current, and this heat is transmitted to the fluid passing through the through hole, and the fluid is heated while passing through the through hole.

JP 2007-128751 A JP 2007-152651 A JP 2007-168223 A

  In the above-described conventional fluid heating device, the heat of the secondary coil that generates heat due to a short circuit is transmitted to the fluid flowing through the through hole of the secondary coil, so that the heat generating area in contact with the fluid can be increased. Even if the difference between the heat generation temperature and the temperature of the fluid heated by the secondary coil is reduced, a predetermined amount of heat can be transmitted to the fluid, and the transformer configuration has a closed magnetic circuit core. The power factor is high and the fluid can be heated efficiently with a small power source. However, since a normal insulated wire is used for the primary coil, it must be considered that the primary coil is cooled against the heat generated by the primary coil, and there is a problem of loss of cooling.

The problem to be solved by the invention is that the heat generated by the primary coil is also used for heating the fluid, and the heating efficiency in this type of fluid heating apparatus is increased.

In order to solve the above-mentioned problems, the present invention divides a single conductor tube, which is partly insulated from a leg core of a closed magnetic circuit core, into an insulated part and a non-insulated part. The ends of the wound conductor tube in which the wound conductor tube wound around a plurality of layers is integrated by mechanically and electrically connecting and fixing the windings of the wound conductor tube wound around the non-insulated portion. In addition, an AC voltage is applied to the first conductor tube, and a fluid is passed through the one conductor tube.

In the present invention, an alternating current is passed through an insulated winding conductor tube, the insulated winding conductor tube generates resistance heat, and is generated by an alternating current passed through the insulated winding conductor tube. Due to the alternating magnetic flux, an induced current flows through the non-insulated winding conductor tube, and the non-insulating winding conductor tube generates resistance heat. Therefore, the fluid flowing in the insulated conductor tube and the non-insulated conductor tube is heated by the heat generated by both, and the heat generated in the conductor tube is used for heating the fluid. The heating efficiency can be increased, that is, the heat generated in the conventional primary coil can be effectively used for heating the fluid. In addition, since the insulated and non-insulated wound conductor pipes are composed of a single conductor pipe, there is no leakage due to cuts (seam) in the conductor pipe, and flammable oil is used as a heating fluid. And strong acid / alkali fluids can be used safely.

It is a half cross-sectional schematic diagram of the winding conductor pipe | tube part of the fluid heating apparatus which concerns on the Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the structure of the fluid heating apparatus based on the Example of this invention, (a) is a top view, (b) is a side view, (c) is a connection diagram. It is a half cross-sectional schematic diagram of the winding conductor pipe | tube part of the fluid heating apparatus which concerns on the other Example of this invention. It is a block diagram which shows the structure of the fluid heating apparatus which concerns on the other Example of this invention, (a) is a top view, (b) is a side view, (c) is a connection diagram. It is a perspective view of a leg iron core. It is a half cross-sectional schematic diagram of the winding conductor pipe | tube part of the fluid heating apparatus which concerns on the further another Example of this invention. It is a block diagram which shows the structure of the conventional fluid heating apparatus, (a) is a top view, (b) is a side view, (c) is a half cross-sectional view of a coil part.

A fluid heating apparatus applied to a single-phase power source according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, 11 is a leg iron core whose outer peripheral surface is insulated, 12a is a wound conductor tube which is insulated, 12b is a non-insulated wound conductor tube, 12c is a fluid inlet flange, 12d is a fluid outlet flange, 14 is Insulating flakes (in this example, a polyimide film in which a solventless insulating adhesive is applied to the entire front and back surfaces).

Insulated treatment (in this example, a polyimide film coated with a non-solvent insulating adhesive is wound and insulated) and the wound conductor tube 12a is not insulated (hereinafter referred to as non-insulated treatment). 12b is formed of a single conductor tube (including one that has been connected by welding or the like) in which a part of the length is insulated, and a conductor tube portion that is insulated in one conductor tube, The outer peripheral surface is wound around the leg iron core 11 which has been subjected to insulation treatment (in this example, a polyimide film coated with a solventless insulation adhesive is wound) through the insulation thin piece 14 (winding conductor tube 12a). Then, it is wound around the outer periphery of the insulated conductor tube (wound conductor tube 12a) that is wound around the non-insulated conductor tube portion (wound conductor tube 12b). The winding conductor tube 12b is mechanically and electrically connected and fixed by welding a conductor plate or the like. Note that the wound conductor tube 12 a and the wound conductor tube 12 b may be formed and fitted into the leg iron core 11.

The fluid inlet flange 12c is formed in the opening of the insulated conductor tube portion of one conductor tube, and the fluid outlet flange 12d is formed in the opening of the non-insulated conductor tube portion. Therefore, in this case, the fluid introduced from the fluid inlet of the fluid inlet flange 12c is led out from the outlet of the fluid outlet flange 12d via the innermost winding conductor 12a and the outermost winding conductor 12b in this order. Is done. That is, the fluid is heated by the innermost winding conductor tube 12a and further heated by the outermost winding conductor tube 12b. In this case, since the fluid having the lowest temperature flows through the innermost winding conductor tube 12a, the cooling effect of the leg iron core 11 can be enhanced.

In the illustrated example of FIG. 1, the winding conductor tube 12b is mechanically and electrically connected and fixed between all windings. However, as shown in FIG. The illustrated example may be divided into three), and a plurality of divided windings (four windings in the illustrated example) may be mechanically and electrically connected and fixed. Thus, if the windings are mechanically and electrically connected and fixed for each of a plurality of windings, the winding width of the winding conductor tube 12a and the winding width of the winding conductor tube 12b can be adjusted to the same extent. Further, the heat generation capacity of the wound conductor tube 12b can also be adjusted by adjusting the number of turns to be mechanically and electrically connected and fixed to the wound conductor tube 12b. That is, in the illustrated example of FIG. 1, the wound conductor tube 12 b is equivalent to one turn, but in the illustrated example of FIG. 6, it is equivalent to three turns and the divided conductor tube 12 b is three turns. The power consumed is reduced.

As shown in FIG. 5, the leg iron core 11 is formed in a cylindrical shape by laminating a large number of magnetic steel plates 11a having curved portions curved in an involute curve, and this is formed in three stages in the radial direction with ABC. It is preferable to use a laminated iron core (the number of laminated layers is determined by the required diameter of the leg iron core) (hereinafter, this iron core is referred to as an involute leg iron core). In addition, a polyimide film coated with a non-solvent insulating adhesive may be used as an insulating treatment for the leg iron core. Thus, the involute leg iron core wound with a polyimide film coated with a solvent-free insulating adhesive is almost completely circular, and the insulation treatment part has a low heat insulating effect (no bubbles are generated due to drying, etc.) .), Because of its high thermal conductivity, when a conductor tube is wound through a polyimide film coated with a solvent-free insulating adhesive on both front and back surfaces, iron loss heat is efficiently transmitted to the conductor tube. Iron loss heat generation can also be effectively used as fluid heating. In other words, the leg iron core is cooled by the fluid flowing through the conductor tube, and the temperature rise of the leg iron core can be suppressed.

As shown in FIGS. 2 (a) and 2 (b), the leg core 11 fitted with the wound conductor tube 12a and the wound conductor tube 12b is disposed between both end portions of the upper and lower yoke cores 13 and is fastened and fixed. The That is, the upper and lower yoke iron cores 13 and leg iron cores 11 form a closed-shaped magnetic path. As shown in FIG. 2 (c), one end of the insulated winding conductor tube 12a wound around the leg core 11 on one side is connected to the input U terminal of the single-phase power source, and the other end is connected to the single-phase power source. Connected to the input V terminal, the folded portion of the conductor tube is connected to the input U terminal of the single-phase power source. Also, one end of the insulated winding conductor tube 12a wound around the other leg iron core 11 is connected to the input U terminal of the single-phase power source, and the other end is connected to the input V terminal of the single-phase power source. The folded portion of the conductor tube is connected to the input V terminal of the single-phase power source.

When an AC power supply is connected to the input U and V terminals of the single-phase power supply, an AC voltage is applied to the insulated wound conductor tube 12a wound around the leg cores 11 on both sides, an AC current flows, and a closed magnetic circuit An alternating magnetic flux is generated in the iron core, and an induced current flows through the wound conductor tube 12b interlinked with the alternating magnetic flux. These currents generate heat in the wound conductor tube 12a and the wound conductor tube 12b. This heat is transmitted to the fluid flowing through the inside of the winding conductor tube 12a and the winding conductor tube 12b, and the fluid is sequentially heated while flowing through the winding conductor tube 12a and the winding conductor tube 12b. .

3 and 4 show a fluid heating apparatus applied to a three-phase power source according to another embodiment of the present invention. In FIG. 3, 21 is a leg iron core whose outer peripheral surface is insulated, 22a is an insulated winding. Non-insulated wound conductor tube, 22c is an insulated conductor tube, 22d is a fluid inlet flange, 22e is a fluid outlet flange, and 14 is a solvent-free insulating adhesive. Insulating flakes made of a polyimide-based film.

In this example, the leg iron core 21 is formed in a cylindrical shape by laminating a number of magnetic steel plates 11a having curved portions curved in an involute curve as shown in FIG. 5, and this is laminated in three stages in the radial direction with ABC. (The number of stacked layers is determined by the diameter of the required leg iron core.) The involute iron core is used, and the insulation treatment of the leg iron core 21 and the insulation treatment of the conductor tube are the same as in the example shown in FIG. It is processed by winding a polyimide film coated with.

The insulated winding conductor tube 22a, the non-insulated winding conductor tube 22b, and the insulated winding conductor tube 22c are partly insulated by welding (such as by welding). A conductor tube portion of one conductor tube is wound (winding conductor tube 22c), and the conductor tube portion folded and insulated is wound (winding conductor). The tube 22a) is further wound and the conductor tube portion that has been folded and non-insulated is wound (winding conductor tube 22b), and the winding of the winding conductor tube 22b is mechanically and electrically connected and fixed. The winding conductor tube is fitted into the leg iron core 21 whose outer peripheral surface is insulated through the insulating thin piece 14. That is, three layers of an insulated wound conductor tube 22a, a non-insulated wound conductor tube 22b, and an insulated treated conductor tube 22c are wound on the leg iron core 21 covered with the insulating thin piece 14 in this order. When three-layer winding is used in this way, the magnetic coupling becomes two surfaces (one surface in the case of two-layer winding), and the amount of magnetic leakage is theoretically halved. That is, the impedance of the fluid heating device is lowered, and the power factor and efficiency are improved.

In the illustrated example of FIG. 3, all the turns of the non-insulated conductor tube 22b are electrically short-circuited and fixed. However, the number of turns is divided into a plurality of turns, and the turns between the divided turns are divided. The connection may be fixed mechanically and electrically. Thus, if the winding is electrically short-circuited and fixed for a plurality of turns, the winding width of the winding conductor tube 12a and the winding width of the winding conductor tube 12b can be adjusted to the same extent. The heat generation capacity of the wound conductor tube 22b can also be adjusted by adjusting the number of turns for mechanically and electrically connecting and fixing the wound conductor tube 22b.

The fluid inlet flange 22d is formed in the opening of the insulated conductor tube portion of one conductor tube, and the fluid outlet flange 22e is formed in the opening of the non-insulated conductor tube portion. Therefore, the fluid introduced from the fluid inlet of the fluid inlet flange 22d passes through the outermost wound conductor tube 22c, the innermost wound conductor tube 22a, and the intermediate layer wound conductor tube 22b in this order. It is derived | led-out from the exit of 22e part.

As shown in FIGS. 4 (a) and 4 (b), the leg iron core 21 to which the wound conductor tube 22a, the wound conductor tube 22b and the wound conductor tube 22c are attached is formed at both ends and the center portion of the upper and lower yoke cores 23. It arrange | positions in between and is clamped and fixed to the upper and lower yoke cores 23. That is, the upper and lower yoke iron cores 23 and leg iron cores 21 form a closed letter-shaped magnetic path. As shown in FIG. 4 (c), the insulated wound conductor tubes 12a and 12c wound around the leg iron core 21 are electrically connected in series, and the ends of the wound conductor tube 12a are connected to the legs. It is connected to the end portion of the insulated winding conductor tube 12a wound around the iron core 21, and the end portion of the winding conductor tube 12c is connected to the input U terminal, input V terminal and input W terminal of the three-phase power source, respectively. The That is, the winding conductor tube in which the winding conductor tubes 12a and 12c are electrically connected in series is Y-connected. One end of the wound conductor tube 22b is connected to an input U terminal, an input V terminal, and an input W terminal of a three-phase power source, respectively.

When a three-phase AC power source is connected to the input U, V, W terminals of the three-phase power source, an AC voltage is applied to the insulated wound conductor tubes 12c and 12a wound around the leg cores 21, respectively. An alternating current flows, an alternating magnetic flux is generated in the closed magnetic circuit core, and an electric current flows through each winding conductor tube 22b interlinked with the alternating magnetic flux. These currents generate heat in the wound conductor tubes 22a and 22c and the wound conductor tube 22b. This heat is transmitted to the fluid flowing through the inside of the winding conductor tube 22c, the winding conductor tube 22a, and the winding conductor tube 22b, and the fluid flows through the winding conductor tubes 22c, 22a and the winding conductor tube 22b. Heated sequentially while flowing.

Thus, since the fluid flows through the outermost winding conductor tube 22c, the innermost winding conductor tube 22a, and the intermediate winding conductor tube 22b, the fluid is led out from the intermediate winding conductor tube 22b. The fluid reaches the maximum temperature, and the winding conductor tube 22b of the intermediate layer becomes higher than the winding conductor tube 22c of the outermost layer or the winding conductor tube 22a of the innermost layer. Accordingly, the intermediate layer winding conductor tube 22b having a high temperature is positioned at the center, and the outermost layer winding conductor tube 22c and the innermost layer winding conductor tube 22a having a relatively low temperature are positioned on both outer sides. As a result, the temperature difference from the outside becomes small, and the amount of heat radiation can be suppressed.

Note that the lap winding order may be the order of a non-insulated wound conductor tube, an insulated wound conductor tube, and a non-insulated wound conductor tube.

11 and 21 are leg iron cores 12a, 22a, 22c. Insulated winding conductor tubes 12b, 22b Non-insulated winding conductor tubes 12c, 22d Fluid inlet flanges 12d, 22e Fluid outlet flanges.

Claims (8)

A single conductor tube, which is partly insulated from the length of a closed magnetic circuit core, is wound in multiple layers, divided into a part that is insulated and a part that is not insulated. The windings of the wound conductor tube are mechanically and electrically connected and fixed to be integrated, and an AC voltage is applied to both ends of the wound conductor tube around which the insulated portion is wound, and the one conductor A fluid heating apparatus, wherein a fluid is passed through a pipe. A single conductor tube, which is partly insulated from the length of a closed magnetic circuit core, is wound in multiple layers, divided into a part that is insulated and a part that is not insulated. The number of turns between the windings of the wound conductor tube was divided into a plurality of turns, and each turn was mechanically and electrically connected and fixed for each turn, and each turn was integrated and insulated. A fluid heating apparatus, wherein an alternating voltage is applied to both ends of a wound conductor tube wound with a portion, and a fluid is passed through the one conductor tube. The insulated part of one conductor tube with a part of the length insulated is wound around the leg iron core of the closed magnetic circuit core, and the non-insulated part is wound around the outer circumference of the insulated conductor tube. The fluid heating device according to claim 1 or 2, wherein the fluid heating device is rotated. Insulated wound conductor tube, non-insulated wound conductor tube, insulated wound conductor tube in order, or non-insulated wound conductor tube, insulated winding on leg core of closed magnetic circuit core The fluid heating apparatus according to claim 1 or 2, wherein three layers of the conductor pipe and the non-insulated wound conductor pipe are wound in order. 5. The fluid heating device according to claim 4, wherein the fluid flows in from the innermost layer winding conductor tube or the outermost layer winding conductor tube of the winding conductor tube and flows in the direction of discharging from the middle layer conductor tube. The said leg iron core is the iron core formed in the cylindrical shape by laminating | stacking radially many magnetic steel plates which have the curved part curved in the involute curve shape, or Claim 3 or Claim 3 characterized by the above-mentioned. The fluid heating apparatus according to claim 4. 5. The fluid heating according to claim 1, 2, 3, or 4, wherein the conductor tube and the leg iron core are insulated by winding an insulating thin piece coated with a solventless insulating adhesive. apparatus. 8. The fluid heating apparatus according to claim 7, wherein the insulating thin piece is a polyimide film.

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