JP2013160492A - Fluid heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a circuit power factor to enhance efficiency of facility, in a fluid heating device that energizes and heats by applying an ac volatge across conductor pipes in which a fluid flows in the interior.SOLUTION: A fluid heating device includes a fluid heating part 3 composed of one conductor pipe 2 or a plurality of conductor pipes 2 electrically connected to each other, and is configured such that an ac voltage from an ac power source 4 is applied across both ends of even numbers of divided elements 3a, 3b formed by dividing an impedance value of the fluid heating part 3 into equal even number parts, and electric currents flowing through the divided elements 3a, 3b are made reverse relative to each other, thus magnetic fluxes generated on each of the even numbers of the divided elements 3a, 3b are cancelled each other as a whole.

Description

  The present invention relates to a fluid heating apparatus.

  As a fluid heating device, as shown in Patent Document 1, there is a device that energizes and heats a hollow conductor tube and heats a fluid flowing inside the conductor tube to generate a heated fluid. In this fluid heating apparatus, an AC voltage is applied from the electrodes provided at both ends of the conductor tube, and an AC current flows through the side wall of the conductor tube, so that the conductor tube is self-generated by Joule heat generated by the internal resistance of the conductor tube. Fever. The fluid flowing through the conductor tube is heated by the self-heating of the conductor tube.

  However, when the AC voltage is applied to both ends of the conductor tube, there is a problem that a voltage drop occurs due to the inductance of the conductor tube, and the power factor of the circuit that applies the AC voltage to the conductor tube is reduced.

JP 2011-86443 A

  Accordingly, the present invention has been made to solve the above-mentioned problems at once, and in a fluid heating apparatus that applies an AC voltage to a conductor tube in which a fluid flows and heats the current by improving the circuit power factor. Increasing equipment efficiency is the main desired issue.

  That is, the fluid heating device according to the present invention is a fluid heating device that heats a fluid flowing in the conductor tube by applying an AC voltage to the conductor tube in which the fluid flows, and heating the fluid flowing in the conductor tube. Provided with a fluid heating section composed of a plurality of conductor tubes connected to each other, and an alternating current from an AC power source is provided at both ends of an even number of dividing elements formed by dividing the impedance value of the fluid heating section into an even number. While applying a voltage, the electric current which flows into the said division | segmentation element is made into the reverse direction mutually, It is comprised so that the magnetic flux which arises in each of an even number of division | segmentation elements may mutually cancel.

  If this is the case, the current flowing in each of the plurality of divided elements formed by dividing the impedance value of the fluid heating unit into an even number is approximately equal to each other, and is configured to cancel each other out as a whole. Therefore, the power factor can be improved by suppressing the voltage drop due to the inductance of the conductor tube. Therefore, the equipment efficiency of the fluid heating device can be improved.

  As a specific embodiment of the conductor tube, it is desirable that the conductor tube is wound spirally. In this case, as shown below, the power factor can be improved by suppressing the voltage drop due to the inductance by various configurations.

  The even number of dividing elements is an even numbered conductor tube layer formed by spirally winding the conductor tube, and the impedance values of the plurality of conductor tube layers are configured to be substantially equal to each other. The even-numbered conductor tube layers are arranged concentrically so that the winding directions of adjacent conductor tube layers are opposite to each other, and one end of each conductor tube layer has two positive and negative AC voltages. It is desirable that a voltage having one of the polarities is applied, and a voltage having the other of the two positive and negative polarities of the AC voltage is applied to the other end of each conductor tube layer. If this is the case, it is only necessary to connect one end side to one polarity and connect the other end side to the other polarity in all of the even-numbered conductor tube layers, so that the circuit configuration can be simplified.

  The even number of dividing elements is an even numbered conductor tube layer formed by spirally winding the conductor tube, and the impedance values of the plurality of conductor tube layers are configured to be substantially equal to each other. The even-numbered conductor tube layers are arranged concentrically so that the winding directions of the adjacent conductor tube layers are the same direction, and are arranged on one end side of one of the adjacent conductor tube layers. The voltage of one of the two positive and negative polarities of the AC voltage is applied, and the voltage of the other of the two positive and negative polarities of the AC voltage is applied to the other end of the one conductor tube layer. A voltage of one of the two positive and negative polarities of the AC voltage is applied to the other end of the other conductor tube layer among the adjacent conductor tube layers, and one end side of the other conductor tube layer The AC voltage has two positive and negative polarities It is desirable that the voltage of the other polarity is applied. Even with such a configuration, the power factor can be improved by suppressing the voltage drop due to the inductance.

  The even number of dividing elements is an even numbered conductor tube layer formed by spirally winding the conductor tube, and the impedance values of the plurality of conductor tube layers are configured to be substantially equal to each other. The even-numbered conductor tube layers are continuously wound concentrically so that the winding directions of the adjacent conductor tube layers are the same direction, and one end side of each conductor tube layer has an AC voltage applied thereto. It is desirable that a voltage having one of the two positive and negative polarities is applied, and a voltage having the other of the two positive and negative polarities of the AC voltage is applied to the other end of each conductor tube layer. If this is the case, one conductor tube can be wound multiple times to form a fluid heating unit with one component, and the number of parts can be reduced and handling can be facilitated.

  The fluid heating device according to the present invention is a fluid heating device that heats a fluid flowing in the conductor tube by applying an AC voltage to the conductor tube in which the fluid flows, and heating the fluid flowing in the conductor tube. A fluid heating section comprising a plurality of conductor tubes electrically connected to each other, and an even number of divided elements formed by evenly dividing the impedance value of the fluid heating section into a current flowing through the divided elements Are opposite to each other, and the magnetic flux generated in each of the even number of divided elements cancels out as a whole.

  If this is the case, the current flowing in each of the plurality of divided elements formed by dividing the impedance value of the fluid heating unit into an even number is approximately equal to each other, and is configured to cancel each other out as a whole. Therefore, the power factor can be improved by suppressing the voltage drop due to the inductance of the conductor tube. Therefore, the equipment efficiency of the fluid heating device can be improved.

  The even number of dividing elements is an even numbered conductor tube layer formed by spirally winding the conductor tube, and the impedance values of the plurality of conductor tube layers are configured to be substantially equal to each other. The even-numbered conductor tube layers are arranged concentrically so that the winding directions of the adjacent conductor tube layers are the same direction, and the even-numbered conductor tube layers are electrically connected in series. In addition, a voltage of one of the two positive and negative polarities of the AC voltage is applied to one end side of the even-numbered conductor tube layers connected in series, and an AC voltage is applied to the other end side of the even-numbered conductor tube layers connected in series. It is desirable to apply a voltage having the other polarity of two positive and negative voltages. In this case, an AC power source may be connected to one end side and the other end side of the even-numbered conductor tube layers connected in series, and the circuit configuration can be simplified.

  It is desirable that a magnetic body for a magnetic circuit is provided in at least one of the core hollow portion of the conductor tube layer wound spirally and the outside of the conductor tube layer. In this case, the magnetic flux generated by energizing the conductor tube layer can be passed along the magnetic body, and the magnetic flux generated by energizing each conductor tube layer can be easily canceled out.

  The conductor tube is not limited to a spiral shape, and the conductor tube may be a straight tube shape. In this case, the configuration of the conductor tube can be extremely simplified.

  According to the present invention configured as described above, in a fluid heating apparatus that applies an AC voltage to a conductor tube in which a fluid flows inside and heats the current by conduction, the circuit power factor can be improved and the equipment efficiency can be improved.

The figure which shows typically the structure of the fluid heating apparatus which concerns on this embodiment. The figure which shows the structure of the fluid heating part of the fluid heating apparatus in the embodiment. The figure which shows the structure of the fluid heating part of the fluid heating apparatus in the embodiment. The figure which shows the structure of the fluid heating part of the fluid heating apparatus in the embodiment. The figure which shows the structure of the fluid heating part of the fluid heating apparatus in the embodiment. The figure which shows the circuit structure and test result of the spiral coil test of 1 layer winding. The figure which shows the circuit structure and test result of a spiral coil test of two-layer winding. The figure which shows the circuit structure and test result of the spiral coil test of 2 steps | paragraphs 2 layers winding. The figure which shows the circuit structure and test result of a straight tubular conductor tube test.

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

  As shown in FIG. 1, the fluid heating apparatus 100 according to the present embodiment applies an AC voltage from an AC power supply 4 to a hollow conductor tube 2 in which a fluid flows, and directly energizes the hollow conductor tube 2. The fluid flowing through the conductor tube 2 is heated by heating the conductor tube 2 with Joule heat generated by the above.

  Specifically, this includes a fluid heating unit 3 including one conductor tube 2 or a plurality of conductor tubes 2 electrically connected to each other.

  The fluid heating unit 3 can have various configurations as shown in FIGS.

  The fluid heating unit 3 shown in FIG. 2 is composed of two conductor tubes 2 that are electrically connected by an AC circuit including an AC power source 4, and divides the impedance value of the entire fluid heating unit 3 into an even number. The alternating voltage from the alternating current power source 4 is applied to both ends of the even number (two in the present embodiment) of the dividing elements 3a and 3b.

  Each of the dividing elements 3a and 3b is a conductor tube layer formed by spirally winding a conductor tube 2 having fluid inlets 2Px and 2Py at both ends into which a fluid to be heated flows in or out. The impedance values of the two conductor tube layers 3a and 3b, which are two divided elements, are configured to be substantially equal to each other by adjusting the number of windings, the tube length, the tube diameter, the wall thickness, the winding diameter, and the winding height. Has been. In this embodiment, it is comprised by making the pipe diameter of the conductor pipe | tube 2 which comprises each conductor pipe | tube layer 3a, 3b, the thickness, the frequency | count of winding, etc. the same.

  Further, the conductor tube 2 is insulated by an insulator or a gap for each turn. For example, it is conceivable to use a conductor tube 2 that has been subjected to insulation processing such as providing an insulating layer on the outer peripheral surface. Or you may comprise so that it may divide into blocks every several turns and it may insulate for every block. The number of blocks is determined by the value of current flowing through the conductor tube 2.

  The two conductor tube layers 3a and 3b are concentrically arranged in two layers so that the respective winding directions are opposite to each other. When the number of conductor tube layers is an even number of 4 or more, the conductor tube layers are arranged concentrically so that the winding directions of adjacent conductor tube layers are opposite to each other. Here, it is desirable to provide a magnetic body for a magnetic circuit in at least one of the core hollow portion of the inner conductor tube layer 3a and the outer side of the outer conductor tube layer 3b.

  In the fluid heating section 3 configured as described above, the fluid inlets / outlets 2Px and 2Py of the conductor pipes 2 constituting the conductor pipe layers 3a and 3b are arranged at one end side (upper end side in FIG. 2) and the other end side (in FIG. 2). The configuration is located on the lower end side. The fluid inlet / outlet 2Px, 2Py has a flange portion for connecting an external pipe.

  And in this fluid heating part 3, the voltage of one polarity (plus voltage in FIG. 2) of two positive and negative polarities of AC voltage is applied to one end side (upper end side in FIG. 2) of each conductor tube layer 3a, 3b. The voltage of the other polarity (negative voltage in FIG. 2) of the two positive and negative AC voltages is applied to the other end side (lower end side in FIG. 2) of each conductor tube layer 3a, 3b.

  That is, for applying a voltage of one polarity of the AC voltage from the AC power supply 4 to one end portion or the vicinity thereof constituting the fluid inlet / outlet port 2Px on one end side in the conductor tube 2 constituting each conductor tube layer 3a, 3b. A connection terminal (not shown) is connected. Further, a voltage of the other polarity of the AC voltage from the AC power supply 4 is applied to the other end of the fluid inlet / outlet port 2Py on the other end side of the conductor tube 2 constituting each of the conductor tube layers 3a and 3b. For this purpose, a connection terminal (not shown) is connected.

  In this way, by applying an alternating voltage to each conductor tube layer 3a, 3b, the currents flowing in each conductor layer 3a, 3b are opposite to each other, and magnetic flux generated when one conductor tube layer 3a is energized, Magnetic fluxes generated when the other conductor tube layer 3b is energized are opposite to each other and cancel each other.

  The fluid heating unit 3 shown in FIG. 3 has the same configuration of the conductor layers 3a and 3b, which are two divided elements, with respect to the fluid heating unit 3 in FIG. The direction of the winding direction of 3b and the application method of the alternating voltage are different.

  That is, the two conductor tube layers 3a and 3b are arranged in two layers concentrically so that their winding directions are the same as each other. In the case where the number of conductor tube layers is an even number of 4 or more, they are similarly arranged concentrically so that their winding directions are the same.

  In the fluid heating unit 3 configured as described above, one of the two conductor tube layers 3a and 3b is connected to one end of the conductor tube layer 3a. Is applied to the other end of one of the conductor tube layers 3a, and a voltage having the other of the two positive and negative polarities of the AC voltage (a negative voltage in FIG. 3) is applied. In addition, a voltage having one of the two positive and negative polarities of the AC voltage (positive voltage in FIG. 3) is applied to the other end of the other conductor tube layer 3b of the two conductor tube layers 3a and 3b. One of the two positive and negative polarities of the AC voltage is applied to one end of the conductor tube layer 3b (negative voltage in FIG. 3). That is, the same polarity voltage is applied to one end side of one conductor tube layer 3a and the other end side of the other conductor tube layer 3b, and the other end side of one conductor tube layer 3a and the other conductor tube layer 3b A voltage having the same polarity is applied to one end side.

  That is, a connection for applying a voltage of one polarity of the AC voltage from the AC power supply 4 to one end of the fluid inlet / outlet port 2Px on one end side of the conductor tube 2 constituting one conductor tube layer 3a or the vicinity thereof. A terminal (not shown) is connected, and the other end of the fluid inlet / outlet 2Py on the other end of the conductor tube 2 constituting one conductor tube layer 3a is connected to the other end of the fluid inlet / outlet 2Py or the vicinity thereof. A connection terminal (not shown) for applying a polarity voltage is connected. Also, in order to apply a voltage of one polarity of the AC voltage from the AC power supply 4 to the other end portion of the fluid inlet / outlet port 2Py on the other end side of the conductor tube 2 constituting the other conductor tube layer 3b or the vicinity thereof. Are connected to one end of the fluid inlet / outlet port 2Px on one end side of the conductor tube 2 constituting the other conductor tube layer 3b, and the other end of the AC voltage from the AC power source 4 is connected to the other end of the fluid inlet / outlet 2Px. A connection terminal (not shown) for applying a polarity voltage is connected.

  In this way, by applying an alternating voltage to each conductor tube layer 3a, 3b, the currents flowing in each conductor layer 3a, 3b are opposite to each other, and magnetic flux generated when one conductor tube layer 3a is energized, Magnetic fluxes generated when the other conductor tube layer 3b is energized are opposite to each other and cancel each other.

  The fluid heating unit 3 shown in FIG. 4 is composed of one conductor tube 2 electrically connected by an AC circuit including an AC power source 4, and divides the impedance value of the entire fluid heating unit 3 into an even number. The alternating voltage from the alternating current power source 4 is applied to both ends of the even number (two in the present embodiment) of the dividing elements 3a and 3b.

  The two split elements 3a and 3b are connected to the inner conductor tube layer 3a formed by spirally winding one conductor tube 2 from one end side to the other end side, and to the other end of the conductor tube layer 3a. The outer conductor tube layer 3b is formed by spirally winding from the other end side to the one end side in the same direction as the winding direction of the inner conductor tube layer 3a. The impedance values of the conductor tube layers 3a and 3b are configured to be substantially equal to each other. In this embodiment, the conductor tube layers 3a and 3b are configured to have the same number of turns.

  In this way, the two conductor tube layers 3a and 3b are configured to be concentrically wound in two layers so that the respective winding directions are the same. In other words, the fluid heating unit configured in this manner is configured such that the two conductor tube layers 3a and 3b are continuously integrated. When the number of conductor tube layers is an even number of 4 or more, one conductor tube 2 is wound in the same direction, continuously from one end side to the other end side, and then continuously from the other end side to the one end side. It is constructed by winding concentrically.

  In the fluid heating unit 3 configured as described above, the two fluid inlets / outlets 2Px and 2Py are positioned on one end side (the upper end side in FIG. 4) regardless of the number of conductor tube layers.

  And in this fluid heating part 3, the voltage of one polarity (plus voltage in FIG. 4) of two positive and negative polarities of AC voltage is applied to one end side (upper end side in FIG. 4) of each conductor tube layer 3a, 3b. Applied to the folded portion where the conductor tube layers 3a and 3b are continuous on the other end side of the conductor tube layers 3a and 3b, that is, at an intermediate position between the two fluid inlets and outlets. The voltage of the other polarity (minus voltage in FIG. 4) is applied. In this way, a common voltage is applied to the adjacent ends of the two conductor tube layers 3a and 3b (locations where the dividing elements are divided).

  That is, a connection for applying a voltage of one polarity of the AC voltage from the AC power source 4 to the end portion or the vicinity thereof constituting one fluid inlet / outlet port 2Px of the conductor tube 2 constituting each conductor tube layer 3a, 3b. A terminal (not shown) is connected to one end of the other fluid inlet / outlet port 2Py of the conductor tube 2 constituting each of the conductor tube layers 3a and 3b, or in the vicinity thereof, with one polarity of the AC voltage from the AC power source 4 A connection terminal (not shown) for applying a voltage is connected. In addition, a connection terminal (not connected) for applying the voltage of the other polarity of the AC voltage from the AC power source 4 to the folded portion where the conductor tube layers 3a and 3b are continuous on the other end side of the conductor tube layers 3a and 3b. Are connected. In addition, the code | symbol 31 in FIG. 4 is a connection piece provided in the folding | turning part (intermediate position) and the connection terminal of the said AC power supply 4 is connected.

  By applying an alternating voltage to each conductor tube layer in this way, the currents flowing through the conductor layers 3a and 3b are opposite to each other, and the magnetic flux generated when one conductor tube layer 3a is energized and the other conductor The magnetic fluxes generated when the tube layer 3b is energized are opposite to each other and cancel each other.

  The fluid heating unit 3 shown in FIG. 5 has the same configuration of the conductor layers 3a and 3b, which are two divided elements, as compared to the fluid heating unit 3 in FIG. 2 described above, but each of the conductor layers 3a and 3b. The direction of the winding direction, the connection method, and the application method of the AC voltage are different.

  That is, the two conductor tube layers 3a and 3b are arranged in two layers concentrically so that the respective winding directions are the same direction, and are electrically in series with the AC power source 4. It is connected to the. Specifically, as shown in FIG. 5, the other end side of each conductor tube layer 3a, 3b is connected and short-circuited by the conductive member 5, whereby the other end portion of one conductor tube layer 3a and the other The other end of the conductor tube layer 3b is electrically connected. When the number of conductor tube layers is an even number of 4 or more, one end sides or the other end sides of the adjacent conductor tube layers are electrically connected in series.

  In the fluid heating unit 3, one of the two positive and negative polarities of the AC voltage is applied to one end of the two conductor tube layers 3a and 3b connected in series, that is, one end of the one conductor tube layer 3a. (Plus voltage in FIG. 5) is applied, and two polarities of the AC voltage are applied to the other end side of the two conductor tube layers 3a and 3b connected in series, that is, one end side of the other conductor tube layer 3b. The voltage of the other polarity (minus voltage in FIG. 5) is applied.

  That is, a connection terminal for applying a voltage of one polarity of the AC voltage from the AC power source to one end of the fluid inlet / outlet 2Px on one end side of the conductor tube 2 constituting one conductor tube layer 3a or the vicinity thereof. (Not shown) is connected, and the voltage of the other polarity of the AC voltage from the AC power source is applied to one end of the fluid inlet / outlet port 2Px on one end side of the conductor tube 2 constituting the other conductor tube layer 3b or in the vicinity thereof. A connection terminal (not shown) for applying is connected.

  Thus, by applying an alternating voltage to each conductor pipe layer 3a, 3b, the electric current which flows into each conductor layer 3a, 3b becomes a mutually reverse direction, the magnetic flux which arises when one conductor pipe layer is energized, and the other The magnetic fluxes generated when the conductive tube layers are energized are opposite to each other and cancel each other.

  Next, the test which shows the power factor improvement of the fluid heating apparatus 100 comprised in this way is demonstrated. In the following tests, a single-phase AC power source with a frequency of 800 Hz was used to express the comparative tendency prominently. However, in an actual fluid heating device, a single-phase AC power source with a commercial frequency of 50 Hz or 60 Hz should be used. Can be considered, and is higher than the power factor shown below.

6 shows a case where a single-phase AC voltage is applied to a coil element formed by winding a copper wire having a cross-sectional area of 8.042 mm ² and a diameter of 3.2 mm in a spiral manner 60 times (test No. 1 and FIG. )) And two coil elements formed by spirally winding the copper wire in the axial direction, and a single-phase AC voltage on the other end side of one coil element and one end side of the other coil element. When applying one of the two positive and negative polarities and applying the other of the two positive and negative polarities of the single-phase AC voltage to one end of one coil element and the other end of the other coil element ( A circuit configuration with test No. 2 and FIG.

  At this time, as shown in the lower table of FIG. In the case of 1, the power factor was 0.039, whereas the test No. In the case of 2, test no. At the same capacity as 1, the power factor was 0.048. In this way, in the case of FIG. 6B, it is considered that the power factor is improved by suppressing the voltage drop because the magnetic fluxes generated in the respective conductor tube layers cancel each other.

Next, in FIG. 7, a coil layer is formed by winding 60 turns of a copper wire having a cross-sectional area of 8.042 mm ² and a diameter of 3.2 mm spirally from one end side to the other end side so that the winding direction is the same direction. When a single-phase AC voltage is applied to both ends of a two-layered coil element formed by winding 60 from one end side to the other end side to form a coil layer (Test No. 1, FIG. 7 (1)), the coil When one polarity of two positive and negative polarities of the single-phase AC voltage is applied to one end of the element, and the other polarity of two positive and negative polarities of the single-phase AC voltage is applied to the other end of the coil element ( A circuit configuration with test No. 2 and FIG.

  At this time, as shown in the lower table of FIG. In the case of 1, the power factor was 0.026, whereas the test No. In the case of 2, test no. At a capacity equivalent to 1, the power factor was 0.225. In this way, in the case of FIG. 7B, it is considered that the power factor is improved by suppressing the voltage drop because the magnetic fluxes generated in the respective conductor tube layers cancel each other. The power factor when a single-phase AC power source with a commercial frequency of 60 Hz is used is the test number. In the case of No. 1, it is 0.324. In the case of 1, it is 0.951.

Next, in FIG. 8, a coil layer is formed by winding 60 turns of a copper wire having a cross-sectional area of 8.042 mm ² and a diameter of 3.2 mm spirally from one end to the other so that the winding direction is the same direction. In the two-layer coil element in which the coil layer is formed by winding 60 from the other end side to the one end side, one polarity of the positive and negative two polarities of the single-phase AC voltage at the center position of one end and the other end of the coil element Is shown, and the other one of the positive and negative polarities of the single-phase AC voltage is applied to one end and the other end of the coil element.

  At this time, as shown in the lower table of FIG. At a capacity equivalent to 2, the power factor was 0.248. Thus, in the case of FIG. 8, the power factor is improved as compared with the case shown in FIG. The power factor when a single-phase AC power source with a commercial frequency of 60 Hz is 0.960.

  According to the fluid heating apparatus 100 according to the present embodiment configured as described above, the currents flowing in the plurality of divided elements 3a and 3b formed by dividing the impedance value of the fluid heating unit substantially evenly into directions are opposite to each other. Therefore, the power factor can be improved by suppressing the voltage drop due to the inductance of the conductor tube 2. Therefore, the equipment efficiency of the fluid heating apparatus 100 can be improved.

<Other modified embodiments>
The present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the dividing element is configured by winding a conductor tube in a spiral shape. However, the fluid heating unit includes a conductor tube having a straight tube shape, and the dividing element has a straight tube shape. There may be. In this case, the two fluid inlets / outlets 2P are located at the axial ends of the conductor tube 2, respectively.

  FIG. 9 shows a test showing the power factor improvement of the fluid heating apparatus having the fluid heating unit composed of the divided elements formed in the straight tube shape as described above.

  9 shows a case where a single-phase AC voltage is applied to both ends of a stainless steel tube having a diameter of 34 mm, a tube length of 2200 mm, and a tube thickness of 1.65 mm (test No. 1, FIG. 9 (1)), and the stainless steel Divide the tube into two equal parts, apply one of the two positive and negative polarities of the single-phase AC voltage to both ends of the stainless steel tube, and single-phase AC at the intermediate position of the stainless steel tube (the boundary between the two split elements) The circuit configuration when the other polarity of two positive and negative voltages is applied (test No. 2, FIG. 9 (2)) is shown.

  At this time, as shown in the lower table of FIG. In the case of 1, the power factor was 0.1715, whereas the test No. In the case of 2, test no. At the same capacity as 1, the power factor was 0.1985. Thus, in the case of FIG. 9 (2), it is considered that the power factor is improved by suppressing the voltage drop because the magnetic fluxes generated in the two split elements cancel each other.

  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 2 ... Conductor tube 3 ... Fluid heating part 3a, 3b ... Dividing element (conductor tube layer)

Claims (9)

A fluid heating device that heats an electric current by applying an AC voltage to a conductor tube in which a fluid flows, and heats the fluid flowing in the conductor tube,
Both ends of an even number of divided elements, each having a fluid heating portion comprising a single conductor tube or a plurality of conductor tubes electrically connected to each other, and formed by equally dividing the impedance value of the fluid heating portion While applying the AC voltage from the AC power source to
A fluid heating apparatus configured such that currents flowing through the dividing elements are opposite to each other, and magnetic fluxes generated in the even number of dividing elements cancel each other as a whole.   The fluid heating apparatus according to claim 1, wherein the conductor tube is wound spirally. The even-numbered dividing element is an even-numbered conductor tube layer formed by spirally winding the conductor tube;
The impedance values of each of the plurality of conductor tube layers are configured to be substantially equal to each other,
The even-numbered conductor tube layers are arranged concentrically so that the winding directions of the conductor tube layers adjacent to each other are opposite to each other,
One of the two positive and negative polarities of the AC voltage is applied to one end of each conductor tube layer, and the other of the two positive and negative polarities of the AC voltage is applied to the other end of each of the conductor tube layers. The fluid heating apparatus according to claim 1, wherein a polarity voltage is applied. The even-numbered dividing element is an even-numbered conductor tube layer formed by spirally winding the conductor tube;
The impedance values of each of the plurality of conductor tube layers are configured to be substantially equal to each other,
The even-numbered conductor tube layers are arranged concentrically so that the winding directions of the conductor tube layers adjacent to each other are the same direction,
A voltage of one of the two positive and negative polarities of the alternating voltage is applied to one end of one of the adjacent conductor tube layers, and the other end of the one conductor tube layer is The voltage of the other of the two positive and negative polarities of the AC voltage is applied,
A voltage of one of the two positive and negative polarities of the AC voltage is applied to the other end of the other conductor tube layer of the adjacent conductor tube layers, and one end of the other conductor tube layer The fluid heating device according to claim 1 or 2, wherein a voltage having the other polarity of the positive and negative AC voltages is applied. The even-numbered dividing element is an even-numbered conductor tube layer formed by spirally winding the conductor tube;
The impedance values of each of the plurality of conductor tube layers are configured to be substantially equal to each other,
The even-numbered conductor tube layers are continuously wound concentrically so that the winding directions of adjacent conductor tube layers are the same direction,
One of the two positive and negative polarities of the AC voltage is applied to one end of each conductor tube layer, and the other of the two positive and negative polarities of the AC voltage is applied to the other end of each of the conductor tube layers. The fluid heating apparatus according to claim 1, wherein a polarity voltage is applied. A fluid heating device that heats an electric current by applying an AC voltage to a conductor tube in which a fluid flows, and heats the fluid flowing in the conductor tube,
A fluid heating unit comprising a single conductor tube or a plurality of conductor tubes electrically connected to each other, and an even number of divided elements formed by evenly dividing the impedance value of the fluid heating unit; A fluid heating apparatus configured such that currents flowing through the dividing elements are opposite to each other, and magnetic fluxes generated in each of the even number of dividing elements cancel each other as a whole. The even-numbered dividing element is an even-numbered conductor tube layer formed by spirally winding the conductor tube;
The impedance values of each of the plurality of conductor tube layers are configured to be substantially equal to each other,
The even-numbered conductor tube layers are arranged concentrically so that the winding directions of the conductor tube layers adjacent to each other are the same direction,
The even-numbered conductor tube layers are connected in series so that one end of the even-numbered conductor tube layers connected in series is applied with a voltage having one of two positive and negative polarities of the AC voltage. The fluid heating device according to claim 6, wherein a voltage of the other of the two positive and negative polarities of the AC voltage is applied to the other end of the even-numbered conductor tube layers connected in series.   The fluid heating device according to any one of claims 1 to 7, wherein a magnetic body for a magnetic circuit is provided on at least one of a hollow core portion of the conductor tube layer wound spirally and an outer side of the conductor tube layer.   The fluid heating apparatus according to claim 1, wherein the conductor tube has a straight tubular shape.