JP2014022227A - Induction heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating apparatus which is equipped in a floodgate arrangement and the like, and which can intensively heat only near a water surface easy to freeze in winter thereby to enable reduction in power consumption.SOLUTION: An induction heating apparatus comprises a guide tube 9 which is arranged from below to above a water surface for guiding water from below; a heat-generating tube piece 10 housed in the guide tube 9 movably in a vertical direction; a float 11 attached to the heat-generation tube piece 10 for floating the heat-generation tube piece 10 on a water surface 8a of water guided into the guide tube 9; and an electric insulated wire 12 inserted into the guide tube 9 and the heat-generation tube piece 10. A material of the heat-generation tube piece 10 is a material which is more subject to induction current than a material of the guide tube 9 when alternating current is conducted to the electric insulated wire 12. Accordingly, only near the water surface 8a easy to freeze in winter can be heated because the heat-generation tube piece 10 floated by the float 11 on the water surface 8a in the guide tube 9 intensively heated by induction current.

Description

  The present invention relates to an induction heating device that is installed in a sluice facility or the like and prevents freezing of water in winter, and more particularly, an induction heating device that can concentrate and heat only the vicinity of a water surface that is likely to freeze, thereby reducing power consumption. About.

  2. Description of the Related Art As an induction heating device that uses induction heating, a device that includes a tube serving as a heating element, an insulated wire inserted through the tube, and an AC power source connected to the insulated wire is known. (See Patent Documents 1 to 3). This induction heating device generates an induction current (eddy current) due to electromagnetic induction in a tubular body by an alternating magnetic flux of alternating current applied to an insulated wire from an alternating current power source, and Joule heat based on the electrical resistance of the tubular body through which the induced current flows. This heats the tube body.

  When such an induction heating device is used for a sluice facility, the longitudinal direction of the pipe body serving as a heating element is on the back side of the door plate to which the door body of the sluice facility is applied (the side opposite to the side to which the door body is applied). Lay along. In winter and severe winter, the door plate is heated by the heat generating tube, thereby preventing the door body from icing on the door plate.

JP 2009-243190 A JP 2009-256942 A JP 2009-287389 A

  By the way, in the winter season and the severe winter season, in the sluice facilities, water begins to freeze from the vicinity of the water surface. Therefore, in order to efficiently prevent icing on the door plate of the door body, it is required to intensively heat the door plate near the water surface, which is the starting point of freezing. However, in the conventional induction heating apparatus, since the tube body generates heat over the entire length thereof, the entire door plate is heated by the tube body, and wasteful energy is consumed.

  An object of the present invention, which was created in view of the above circumstances, is to provide an induction heating apparatus that can concentrate and heat the vicinity of a water surface that is likely to freeze, thereby reducing power consumption.

  The induction heating device according to the present invention, which has been created to achieve the above object, is arranged so as to extend from the lower side to the upper side of the water surface, and is guided so that water is guided from the lower side, and is movable up and down in the guide tube. A heat generating tube piece accommodated, a float attached to the heat generating tube piece for floating the heat generating tube piece on the surface of the water led into the guide tube, and an insulated wire inserted through the guide tube and the heat generating tube piece The induction heating device is characterized in that the material of the heating tube piece is a material that is more likely to generate an induction current than the material of the guide tube when an AC current is passed through the insulated wire.

  In the induction heating device of the present invention, a heat insulating material is provided at an upper portion and a lower portion of the heat generating tube piece with a gap from the inner peripheral surface of the guide tube, and the insulated wire is inserted into the heat insulating material so as to be movable in the vertical direction. A hole may be formed.

  In the induction heating device of the present invention, the heat insulating material provided at the lower portion of the heat generating tube piece may also serve as a float.

  In the induction heating device of the present invention, the buoyancy of the float may be set so that the lower end of the heat generating tube piece is positioned on the water surface in the guide tube.

  In the induction heating apparatus of the present invention, the guide tube is formed in a U shape from a pair of straight tubes arranged along the vertical direction and a bent tube connecting the lower ends of these straight tubes. At least one of the pipes is provided with a water guide hole for guiding water outside the pipe into the pipe, and the heat generating pipe pieces are located above the water guide holes and are movably accommodated in the vertical direction inside the pair of straight pipes. An insulated wire is inserted from one upper part of a pair of straight tubes, taken out from the other upper part of the pair of straight tubes through a heat generating tube piece, a bent tube, and a heat generating tube piece. May be connected.

  In the induction heating device of the present invention, the guide tube may be provided on a door plate to which a door body of a sluice facility is applied.

  In the induction heating apparatus of the present invention, the material of the heat generating tube piece may be a material having a higher magnetic permeability than the material of the guide tube.

  In the induction heating device of the present invention, the material of the heating tube piece may be a magnetic material, and the material of the guide tube may be a non-magnetic material.

  According to the induction heating device of the present invention, when an alternating current is passed through the insulated wire inserted through the guide tube and the heat generation tube piece, the material of the heat generation tube piece is more easily generated than the material of the guide tube. Therefore, the heat generating tube piece is heated to a higher temperature than the guide tube.

  Since this exothermic tube piece is floated on the water surface in the guide tube by the float, only the vicinity of the water surface that is likely to freeze can be concentrated and heated. In this way, the vicinity of the water surface can be intensively heated by the exothermic tube pieces floated on the surface of the water in the guide tube by the float, thus reducing unnecessary energy consumption compared to the conventional example that generates heat over the entire length of the tube. And power consumption can be reduced.

  As the water level in the guide pipe rises and falls, the float also rises and falls accordingly, so that the exothermic tube piece floating by the float rises and falls according to the rise and fall of the water surface and accurately heats the vicinity of the water surface regardless of the rise and fall of the water surface. it can.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the sluice facility provided with the induction heating apparatus which concerns on one Embodiment of this invention, (a) is a top view of a sluice facility and an induction heating apparatus, (b) is a front view of a sluice facility and an induction heating apparatus. It is. It is explanatory drawing of an induction heating apparatus, (a) is the elements on larger scale of Fig.1 (a), (b) is a bb arrow directional view of Fig.2 (a). It is explanatory drawing of an induction heating apparatus, and is a perspective view of FIG.2 (b). It is a sectional side view which shows the principal part of an induction heating apparatus.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(Sluice equipment 1)
1 to 3 show an outline of a sluice facility 1 in which an induction heating device 2 according to an embodiment of the present invention is incorporated, and FIG. 4 shows a main part of the induction heating device 2. 1 (a) is a plan view of the sluice facility 1 and the induction heating device 2, FIG. 1 (b) is a front view thereof, FIG. 2 (a) is a partially enlarged view of FIG. 1 (a), FIG. 2B is a perspective view of FIG. 2B, FIG. 3 is a perspective view of FIG. 2B, and FIG.

  As shown in FIG. 1, the sluice facility 1 includes a dam pillar 4 erected on a river bottom 3 at a predetermined interval, and a door body 5 that is disposed between the dam pillars 4 and is moved up and down. It has. The weir column 4 is provided with a door plate 6 along the vertical direction so as to face the side surface of the door body 5. A seal 7 is provided along the vertical direction. In winter and severe winter, freezing starts from the vicinity of the water surface 8 of the seal 7 between the door body 5 and the door plate 6.

(Induction heating device 2)
The induction heating device 2 according to the present embodiment intensively heats the vicinity of the water surface 8 of the door plate 6, thereby efficiently preventing icing of the door body 5 to the door plate 6. . As shown in FIGS. 1 to 4, the induction heating device 2 is disposed along the vertical direction on the back side of the door plate 6 in the weir column 4 (the side opposite to the side on which the door body 5 is applied). The guide tube 9, the heating tube piece 10 accommodated in the guide tube 9 so as to be movable in the vertical direction, the float 11 attached to the heating tube piece 10, and the guide tube 9 and the heating tube piece 10 were inserted. Insulated wire 12 is provided. In FIG. 1B and FIG. 3, for the convenience of drawing, only the heating tube piece 10 is displayed inside the guide tube 9, and the float 11 and a heat insulating material 13 described later are omitted. Hereinafter, each component will be described.

(Guide tube 9)
As shown in FIGS. 2 to 4, the guide tube 9 is disposed in the concrete weir column 4 so as to be in contact with the back side of the door stopper plate 6. 8a is positioned. In FIG. 4, the dots in the guide tube 9 represent water. The guide tube 9 is formed in a U-shape from a pair of straight tubes 9a and 9b disposed along the vertical direction on the back side of the door plate 6 and a bent tube 9c connecting the lower ends of the straight tubes 9a and 9b. Is formed. Under the straight pipes 9a and 9b, a water guide hole 9d for guiding water outside the pipe into the pipe is provided.

  As shown in FIGS. 2 and 3, one of the openings of the water introduction hole 9 d is connected to the straight pipes 9 a and 9 b, and the other penetrates the door plate 6 and below the water surface 8 outside the weir column 4 (underwater). It is open to. The water guide hole 9d is provided so as to sandwich the seal 7 when viewed from above so as not to interfere with the seal 7 of the door body 5. The water surface 8a (see FIG. 4) is positioned inside the straight tubes 9a and 9b of the guide tube 9 by the water guided to the guide tube 9 from the water guide hole 9d. The water guide hole 9d only needs to have a function of guiding water outside the pipe into the pipe, and may be provided in at least one of the lower part of the straight pipes 9a and 9b and the bent pipe 9c.

(Fever tube piece 10)
As shown in FIGS. 2 to 4, the heating tube piece 10 is formed in a cylindrical shape, and is located above the water guide hole 9 d inside the pair of straight tubes 9 a and 9 b constituting the guide tube 9. Each is accommodated so as to be movable in the vertical direction. As shown in FIG. 4, a gap G1 is formed between the outer peripheral surface of the heat generating tube piece 10 and the inner peripheral surfaces of the straight tubes 9a and 9b to allow the heat generating tube piece 10 to move up and down. The gap G1 is set as small as possible in order to suppress deterioration in heat transfer from the heating tube piece 10 to the straight tubes 9a and 9b.

  An insulated wire 12 is inserted into the heating tube piece 10 and the guide tube 9 so that when alternating current is passed through the insulated wire 12, the alternating magnetic flux acts on both the heating tube piece 10 and the guide tube 9. It has become. Here, the material of the heating tube piece 10 is a material having a larger magnetic permeability than the material of the guide tube 9. This is because a material having a high magnetic permeability is more likely to generate an induced current by an alternating magnetic flux than a material having a low magnetic permeability, and the heating tube piece 10 can be heated to a higher temperature than the guide tube 9. In addition, it is preferable to use a magnetic material for the material of the heating tube piece 10 and a non-magnetic material for the material of the guide tube 9. An induced current is generated in the magnetic material, but almost no induced current is generated in the non-magnetic material, so that the heat generating tube piece 10 can be intensively heated without generating much heat in the guide tube 9. It is. Specifically, in the present embodiment, an SGP pipe (made of steel) is used as the magnetic body for the heating tube piece 10, and an SUS pipe (made of austenitic stainless steel such as SUS304) as the non-magnetic body for the guide pipe 9. Is used.

(Float 11)
As shown in FIG. 4, a float 11 is attached to the lower part of the heating tube piece 10. The float 11 floats the heating tube piece 10 on the water surface 8a in the guide tube 9, and has a floating portion made of a material having a specific gravity smaller than that of water such as foamed polystyrene. The float 11 is formed in a columnar shape with a gap G2 separated from the inner peripheral surface of the guide tube 9, and is formed so as to penetrate vertically around a hole 11a through which the insulated wire 12 is movably inserted in the vertical direction. ing. The float 11 is movable in the vertical direction along the insulated wire 12 in the guide tube 9. The buoyancy of the float 11 is set so that the lower end 10a of the heat generating tube piece 10 is positioned on the water surface 8a in the guide tube 9 in consideration of the weight of the heat generating tube piece 10 and the weight of the heat insulating material 13 described later. .

  As shown in FIG. 4, a heat insulating material (upper heat insulating material) 13 is provided on the upper portion of the heat generating tube piece 10 with a gap G <b> 3 from the inner peripheral surface of the guide tube 9. The upper heat insulating material 13 is made of a material having a heat insulating function such as foamed polystyrene, and has the same shape as the float 11. That is, the upper heat insulating material 13 is formed in a columnar shape with a gap G3 separated from the inner peripheral surface of the guide tube 9, and is vertically moved around a hole 13a through which the insulated wire 12 is movably inserted in the vertical direction. The guide tube 9 is movable in the vertical direction along the insulated wire 12. The upper heat insulating material 13 suppresses heat generated in the heat generating tube piece 10 from escaping upward in the guide tube 9. In addition to the above-described float 11, a heat insulating material (lower heat insulating material) for suppressing heat generated in the heat generating tube piece 10 from escaping downward in the guide tube 9 is also provided at the lower portion of the heat generating tube piece 10. Although it may be provided, in the present embodiment, the float 11 is made of a heat-insulating material such as foamed polystyrene, so that the float 11 also serves as a lower heat insulating material.

  A gap G2 between the float 11 and the guide tube 9 and a gap G3 between the heat insulating material 13 and the guide tube 9 are set to allow the float 11 and the heat insulating material 13 to move up and down smoothly in the guide tube 9. These gaps G2 and G3 may be equal or different. Further, the gap G1 between the heat generating tube piece 10 and the guide tube 9 is set narrower than the gaps G2 and G3. Deterioration of heat transfer to is suppressed as much as possible.

(Insulated wire 12)
As shown in FIGS. 2 and 4, an insulated wire 12 is inserted through the guide tube 9 and the heating tube piece 10. The insulated wire 12 is inserted from the upper part of one straight tube 9a constituting the guide tube 9, and includes a heat insulating material 13, a heat generating tube piece 10, a float 11, a bent tube 9c, a float 11, a heat generating tube piece 10, and a heat insulating material 13. It is taken out from the upper part of the other straight tube 9b. An AC power supply 14 is connected to both ends of the insulated wire 12 so that an alternating current is passed through the insulated wire 12. The AC power source 14 may be an AC power source having a commercial frequency of 50 Hz or 60 Hz, but is not limited thereto.

(Action / Effect)
As shown in FIG. 4, in this induction heating device 2, the material (steel) of the heating tube piece 10 located on the water surface 8 a in the guide tube 9 has an induction current higher than that of the guide tube 9 (austenitic stainless steel). The material is easily generated. Therefore, when an alternating current is applied to the insulated wire 12 inserted through the guide tube 9 and the heat generating tube piece 10, the heat generating tube piece 10 generates heat intensively with the guide tube 9 hardly generating heat.

  Since the exothermic tube piece 10 is floated on the water surface 8a in the guide tube 9 by the float 11, only the guide tube 9 in the vicinity of the water surface 8a that is easily frozen is concentrated and heated, and the heat of the guide tube 9 is transmitted. The door plate 6 (see FIGS. 1 to 3) near the water surface 8 outside the guide tube 9 is heated intensively. As a result, wasteful energy consumption can be suppressed and power consumption can be reduced as compared with the conventional example in which heat is generated over the entire length of the tube and the door plate 6 is heated over the entire length.

  As shown in FIGS. 2 and 3, the guide tube 9 is connected to the water below the water surface 8 outside the weir column 4 through the water guide hole 9d, and the water surface 8 outside the weir column 4 moves up and down. The water surface 8a inside the guide tube 9 is raised and lowered. When the water surface 8a in the guide tube 9 is moved up and down, the float 11 is also moved up and down accordingly. Therefore, the heat generating tube piece 10 floated by the float 11 accurately moves the guide tube 9 near the water surface 8a near the water surface 8a. Can be heated. As a result, even if the height of the water surface 8 outside the weir column 4 fluctuates, the door plate 6 in the vicinity of the water surface 8 that is likely to freeze can be heated accurately, and ice accretion can be efficiently applied to the door plate 6 of the door body 5. Can prevent well.

  As shown in FIG. 4, the upper heat insulating material 13 is provided at the upper part of the heat generating tube piece 10, and the float 11 provided at the lower part of the heat generating tube piece 10 also serves as the lower heat insulating material. It is possible to suppress heat from escaping up and down in the guide tube 9. Therefore, the heat of the heat generating tube piece 10 can be effectively transmitted to the side guide tube 9 (the guide tube 9 near the water surface 8a). Further, since the float 11 also serves as the lower heat insulating material, the cost can be reduced as compared with the case where the lower heat insulating material is provided separately from the float 11.

  As shown in FIG. 4, the buoyancy of the float 11 is set so that the lower end 10 a of the heating tube piece 10 is positioned on the water surface 8 a in the guide tube 9 in consideration of the weight of the heating tube piece 10 and the heat insulating material 13. ing. As a result, the exothermic tube piece 10 is brought as close to the water surface 8a as possible while preventing the exothermic heat of the exothermic tube piece 10 from being released (heat radiation) due to the exothermic tube piece 10 being immersed in the water in the guide tube 9. Therefore, the heat of the heat generating tube piece 10 can be transmitted to the guide tube 9 in the vicinity of the lateral water surface 8a effectively and accurately.

  As shown in FIG. 2, a guide tube 9 is formed in a U shape from a pair of straight tubes 9a, 9b and a bent tube 9c connecting the lower ends thereof, and a heating tube piece 10 is provided on each of the straight tubes 9a, 9b. The insulated wire 12 is inserted from the upper part of one straight tube 9 a, taken out from the upper part of the other straight tube 9 b through the heat generating tube piece 10, the bent tube 9 c and the heat generating tube piece 10. An AC power supply 14 is connected. As a result, the two exothermic tube pieces 10 can be heated by the single insulated wire 12, and the AC power supply 14 can be disposed above the water surface 8 without difficulty. That is, power can be supplied concentrated from above the guide tube 9 where no water is present.

  As shown in FIG. 4, the insulated wire 12 is held at the center of the guide tube 9 by being inserted through the hole 13 a formed through the heat insulating material 13 and the hole 11 a formed through the float 11, and the heating tube It is separated from the inner peripheral surface of the piece 10. Therefore, the space S between the inner peripheral surface of the heat generation tube piece 10 and the heat insulation electric wire 12 becomes an air heat insulation layer, and even if the heat generation tube piece 10 generates heat, the insulated wire 12 can be prevented from being deteriorated by the heat.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope of the claims. Needless to say, examples or modifications also belong to the technical scope of the present invention.

  For example, by forming irregularities on the outer peripheral surface of the heat insulating material 13, the outer peripheral surface of the float 11, and the outer peripheral surface of the heating tube piece 10, the contact area with the inner peripheral surface of the guide tube 9 is reduced, and the heat insulating material 13, the float 11, A reduction in sliding resistance (friction resistance) when the heat generating tube piece 10 moves up and down along the guide tube 9 may be achieved.

  INDUSTRIAL APPLICABILITY The present invention is installed in a sluice facility or the like, and can be used in an induction heating apparatus that can concentrate and heat only the vicinity of a water surface that is likely to freeze in an induction heating apparatus that prevents freezing of water in winter, and reduces power consumption. .

1 Sluice equipment 2 Induction heating device 5 Door body 6 Door plate 8 Water surface (outside of guide tube)
8a Water surface (in the guide tube)
9 Guide tube 9a Straight tube 9b Straight tube 9c Bent tube 9d Water transfer hole 10 Heating tube piece 10a Lower end 11 Float (also used as lower heat insulating material)
11a hole 12 insulated wire 13 heat insulating material (upper heat insulating material)
13a hole 14 AC power supply G1 gap G2 gap G3 gap

Claims (8)

A guide pipe that is arranged from the bottom to the top of the water surface and from which the water is guided;
A heating tube piece accommodated in the guide tube so as to be movable in the vertical direction;
A float attached to the exothermic tube piece, the float for floating the exothermic tube piece on the surface of the water led into the guide tube;
An insulated wire inserted through the guide tube and the heating tube piece,
An induction heating apparatus characterized in that the material of the heat generating tube piece is a material that is more likely to generate an induced current than the material of the guide tube when an AC current is passed through the insulated wire.   A heat insulating material is provided at an upper portion and a lower portion of the heat generating tube piece with a gap from an inner peripheral surface of the guide tube, and a hole is formed in the heat insulating material so that the insulated wire is movably inserted in the vertical direction. The induction heating apparatus according to claim 1.   The induction heating apparatus according to claim 2, wherein a heat insulating material provided at a lower portion of the heating tube piece also serves as the float.   The induction heating apparatus according to any one of claims 1 to 3, wherein the buoyancy of the float is set so that a lower end of the heat generating tube piece is positioned on a water surface in the guide tube. The guide pipe is formed in a U shape from a pair of straight pipes arranged along the vertical direction and a bent pipe connecting the lower ends of the straight pipes,
At least one of the straight pipe and the bent pipe is provided with a water guide hole for guiding water outside the pipe into the pipe,
The exothermic tube pieces are accommodated inside the pair of straight tubes so as to be movable above and below the water guide holes and vertically movable, respectively.
The insulated wire is inserted from one upper part of the pair of straight tubes, taken out from the other upper part of the pair of straight tubes through the heat generating tube piece, the bent tube, and the heat generating tube piece,
The induction heating apparatus according to any one of claims 1 to 4, wherein an AC power supply is connected to both ends of the insulated wire.   The induction heating apparatus according to any one of claims 1 to 5, wherein the guide tube is provided on a door plate to which a door body of a sluice facility is applied.   The induction heating apparatus according to any one of claims 1 to 6, wherein a material of the heat generating tube piece is a material having a larger magnetic permeability than a material of the guide tube.   The induction heating device according to any one of claims 1 to 7, wherein a material of the heat generating tube piece is a magnetic material, and a material of the guide tube is a non-magnetic material.

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