JP2001131901A - Induction heating type melting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device using induction coils for melting snow on a rail point, stably and conveniently installed for inducing a magnetic field to a point area to be heated. SOLUTION: A plurality of induction coils using straight angle magnet wires in an air-core single layer winding structure are arrayed on a board and molded with insulating resin to form a thin plate heater body which is fixed to a frame plate connected with a connector box to form a snow meting device. The heater body is charged into a space in a floor plate and a current is passed through a heater in the state of putting the upper face of the heater body in close contact with the upper face of the floor plate to cause an eddy current on the floor plate with a magnetic field induced by the coils, which generates Joule heat to heat the floor plate and melt snow on a point area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snow melting apparatus for heating a floor plate by mounting a heater inside a floor plate supporting a rail, wherein an induction coil is incorporated in the heater and the floor plate is heated by an induction magnetic field. About things.

[0002]

2. Description of the Related Art In order to prevent ice and snow from adhering and freezing to a rail point portion for railroads and tracks and its peripheral portion (hereinafter referred to as a point portion) to prevent a switching operation, the point portion is heated. Snow melting equipment is installed. As one of them, a floor plate plug-in type snow melting device is known in which a heating element is mounted inside a floor plate laid below a rail, and the floor plate is heated by the heat generated by the heating element to melt snow at a point portion. JP-A-1-18643). In addition, as a method of heating without using a heating element, an induction coil is attached to the rail, an eddy current is generated in the rail by a magnetic field induced by the coil, and the rail itself is heated by Joule heat generated thereby. Heated snowmelters are known (Japanese Patent Laid-Open No. 1-150601, etc.).

[0003]

Among the prior arts, in the former case, since the heating element is housed in the floor plate, the amount of heat directly radiated from the heating element into the atmosphere is small, but the heating of the point portion is caused by heat generation. This is performed secondarily through the body, causing a loss when the amount of heat is transmitted from the heating element to the floor panel, and there is a problem that the heating efficiency for the point portion is poor and the power consumption is large. In the latter, since the rail generates heat directly and there is no loss other than the internal heat generation of the induction coil, although the heating efficiency for the point portion can be improved in principle compared to the heating method using a heating element, Since the number of turns of the induction coil is small, the inductive coupling ratio is poor, and there is a problem that a dedicated power supply device having a higher frequency than a commercial power supply must be used to induce a magnetic field sufficient for the rail to generate heat.

On the other hand, in a technical field other than this type of snow melting apparatus, an apparatus for performing induction heating using a spiral induction coil is known (Japanese Patent Laid-Open No. 60-89, etc.). It is also conceivable to use it. However, as described above, the induction heating type snow melting apparatus has a structure that is firstly earthquake-resistant and weather-resistant and can be stably installed at a point part, and secondly is a large enough for the point part to generate heat. In addition, it is necessary to be able to induce such a magnetic field and to have a small loss of generated heat, and thirdly, to facilitate the on-site mounting work, and the known spiral induction coil cannot be directly applied to the snow melting apparatus.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a device for melting snow at a point using an induction coil, which can be stably and easily installed and can induce a large magnetic field at the point to heat it. That is the task.

[0006]

In order to solve the above-mentioned problems, a snow melting apparatus according to the present invention is of an induction heating type in which an eddy current is generated by an induced magnetic field to directly generate heat at a point portion. A space provided inside a ferromagnetic floor plate supporting a rail, with a thin plate-shaped heater body in which one or a plurality of induction coils arranged in the same plane and having an air-core single-layer winding structure are covered with an insulator. The power supply is supplied to the heater main body to inductively heat the floor panel.

According to this, by disposing the heater body provided with the induction coil inside the floor plate, it is possible to guide the magnetic field to the floor plate without leakage, and the gap (distance) between the heater body and the floor plate is small. An eddy current can be efficiently generated in the floor plate to generate heat. In addition, since the number of turns of the induction coil can be increased by using the rectangular magnet wire, a magnetic field can be induced with a large magnetic flux density on the floor plate, and the eddy current of the object to be heated increases. A sufficient amount of heat can be obtained to melt the point. Since the heater body is formed by covering the entire induction coil with an insulator, it has excellent durability against rainwater and dust, and the connection wiring does not come off even under impact or vibration, and it is stable in the floor panel Can be installed in Further, since the present apparatus is a floor board insertion type, installation and removal operations are easy.

[0008] The heater body can be constructed using an appropriate number of induction coils according to installation conditions such as the size of the space inside the floorboard and the required heat generation. For more information,
For example, a thin plate made of an insulating material is used as a substrate and an induction coil is mounted thereon, and when using a plurality of induction coils, they are juxtaposed and juxtaposed, and both ends of the coil are routed on both the upper and lower surfaces of the substrate so as not to cause a short circuit. It is formed by wiring, then integrally molding the induction coil and the substrate with an insulating resin such as silicon or an insulating material such as rubber, and further covering the whole with an insulating resin film such as Teflon. When the insulation can be sealed by a method in which an insulating resin film is wound around the induction coil and the substrate, they can be integrated even if the molding step using an insulator is omitted.

In the above-mentioned structure, the heater body may be constituted by continuously integrating a plurality of induction coils with one magnet wire, and having a structure in which there is no connection part of a conductor other than a connection part with a power supply terminal. it can.

[0010] In the above structure, it is preferable that a pressing member such as a spring piece that partially contacts the lower surface of the heater main body is provided together with the heater main body in the space inside the floor plate, and that the upper surface side of the heater main body is pressed against the floor plate. . If the upper surface of the heater body is pressed against the floor plate, the approach state between the induction coil and the floor plate, which is the object to be heated, can be maintained. The amount can be increased. If a pressing member is provided on the lower side of the heater main body, the heater main body and the floor plate are in close contact with each other to stably fix the heater main body, and a gap is formed between the lower portion of the floor plate space and the heater main body. Is formed, and if the pressing member has a structure in which the heater member partially contacts the lower surface of the heater main body, the area where the lower surface of the heater main body makes contact with other members is reduced, and the thermal insulation in the lower surface direction is increased, Heat radiation to areas other than the heated body, that is, areas other than the upper surface of the heater main body can be reduced, and the heating efficiency for the floorboard can be improved. The temperature of the insulator portion of the heater body can also be kept relatively low. As the pressing member, an elastic member such as a spring piece, a spring coil, or rubber, or any other appropriate member that functions to press the heater body upward can be used.

Further, in the above configuration, it is preferable that a high heat conductive member such as a copper plate is provided on the upper surface of the heater body so that the entire floor plate is uniformly heated. When the floor plate is heated through the induction coil, the amount of heat generated differs between the portion where the induced magnetic field is strong and the portion where the induced magnetic field is weak, and the heat is biased in the floor plate. Is provided, the temperature of the entire upper surface of the floor plate can be uniformly and uniformly raised through the heat conducting member.
In addition, as the high heat conductive member, a member having high heat conductivity such as copper can be used, and it is preferable to use a member large enough to be bonded to the entire upper surface of the heater main body or the entire upper surface in the space.

Further, in the above structure, the flat rectangular magnet wire is replaced with an induction coil having an air-core multi-layer winding structure instead of an induction coil having an air-core single-layer winding structure, and an induction coil, an iron core single-layer winding or a multi-layer winding structure. An induction coil or the like can be used, so that the induction magnetic field can be made larger and the amount of heat generated can be increased.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A snow melting apparatus according to the present invention is a snow melting apparatus in which a floor plate is heated from the inside to melt snow at a point portion. As a heating method, an eddy current is generated to directly generate heat in the floor plate itself. At the same time, the heat generated by the loss of the exciting coil is more efficiently transmitted to the floor plate as the object to be heated. Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a point where a snow melting apparatus of the present invention is installed. In the drawing, reference numeral 1 denotes a pillar, 2
Is a floor plate made of iron fixed to the upper surface of the pillar, 3 is a rail supported on the upper surface of the floor plate, 4 is a snow melting device, and 5 is a fall prevention metal fitting for fixing the position of the snow melting device. The floor plate 2 is provided with a space portion 21 having a size capable of disposing at least a heater body described later therein, and an insertion port 22 communicating with this space portion is formed on a side surface (see FIG. 7).

As shown in FIG. 3, the snow melting apparatus 4 of this embodiment has a heater body 41 and a frame plate 4 for supporting the heater body.
2. Connector box 4 attached to the end of the frame plate
3 and a distribution cable 44.

As shown in FIG. 4, the heater main body 41 includes four induction coils 411 each formed by closely winding a conductive wire in a flat spiral shape.
12 are connected in series in a line, and the surface of each coil and substrate is covered with an insulator to form a thin plate.

More specifically, the four induction coils 411 are continuously integrated with a single rectangular magnet wire 411a whose surface is coated with an insulating resin 411b, and are formed by tightly winding a magnet wire with a single layer of air core. And are juxtaposed on the upper surface of the substrate 412, respectively. Further, as shown in FIG. 5, the substrate 412 has a rectangular shape in which the short side direction is slightly larger than the diameter of the induction coil 411, and a predetermined space is provided on one side thereof. A notch 412a is provided, and an opening 41 is provided at a position overlapping the center of each coil when the induction coil 411 is placed.
2b, and each opening 412b is formed on the other side from the edge.
Each of the slits 412c is formed.

In each coil, a wire portion extending from the outer periphery of the concentrically wound coil to the center of the adjacent coil is inserted through a notch 412a provided on a side portion of the substrate 412 and routed to the rear surface of the substrate. Slit 4 on the side
12c, the inside of the slit is displaced to the opening 412b, the coil is wound around the substrate surface side from the opening 412b, and the coil is wound concentrically again. The wire portion of the intersecting coil does not short-circuit across the substrate 412, In addition, they are provided integrally by one wire 411a.

Each of the induction coils 4 juxtaposed on the substrate 412
Reference numeral 11 denotes an insulating resin such as silicon or an insulating material such as rubber, which is integrally molded with the substrate and solidified into a thin plate.
Further, the entire heater body 41 is covered with an insulating resin film 414 such as Teflon. The substrate 41
The induction coils 411 arranged on the second coil 411 may be thinly coated with a thin silicon rubber and press-molded so that each coil is fixed on the substrate.
If the substrate can be fixed on the substrate 412 in an insulated state, the molding step may be omitted, and for example, an adhesive tape made of Teflon may be wound around the induction coil 411 and the substrate 412 to be integrated.

Heater body 41 molded into a thin plate
Is fixed to the upper surface of a dish-shaped frame plate 42 having a connector box 43 connected to a side portion, and the power distribution cable 44 and the wires at both ends of the group of induction coils 411 are connected in the connector box 43. Silicone resin is injected into the boundary between the heater body 41, the frame plate 42 and the connector box 43, and the wiring portion in the connector box 43, and is solidified integrally.

The snow melting apparatus 4 configured as described above has a structure shown in FIG.
As shown in FIG. 5, a spring piece 6 formed by bending a rectangular steel plate in the short direction is applied to the lower side of the heater body 41,
The heater body 41 is loaded together with the spring piece 6 from the insertion opening 22 into the space 21 of the floor plate 2, and the fall prevention metal fitting 5 is engaged with the connector box 43 abutting on the side surface of the floor plate 2, so that the heater body 41 is placed on the pillar 1. Fixed.

As shown in FIG. 8, the heater main body 41 loaded in the space portion 21 of the floor plate 2 is pressed upward with the curved top of the spring piece 6 in contact with the substantially central portion of the lower surface. The upper surface where the induction coils 411 are juxtaposed is pressed against the upper surface of the floor plate 2 in close contact. When power is supplied to the distribution cable 44 in this state, an eddy current is generated in the floor panel 2 by the magnetic field induced by each induction coil 411, and the Joule heat generated thereby causes the upper surface of the floor panel 2 to generate heat. Can melt snow.

In this case, the intensity of the induced magnetic field varies depending on the position of each of the induction coils 411 in close contact with the floor plate 2, and thus the amount of heat generated differs depending on the position of the floor plate 2. As shown in FIG. 9, if the high heat conducting member 7 such as a copper plate having a size to be joined to substantially the entire upper surface of the space portion 21 is installed on the upper surface of the heater main body 41, the floor plate 2 is passed through the high heat conducting member 7. The temperature of the entire upper surface portion can be uniformly increased without unevenness.

Although the heater body 41 of the embodiment has four induction coils 411 arranged in a line, the number of induction coils used and their arrangement can be changed as appropriate. Although the induction coil 411 has a rectangular magnet wire having an air-core single-layer winding structure, a coil having an iron core or a multi-layer winding structure may be used in order to obtain a larger induction magnetic field. As the pressing member installed in the space portion 21 together with the heater main body 41, a member other than the spring piece 6 may be used as long as the pressing member partially touches the lower surface of the heater main body 41 and presses the heater main body 41 upward. Can be.

The apparatus of the present invention has a structure in which a heater body containing an induction coil is inserted into a floor plate. However, a heater body having the same structure as that of a conventionally used snow melting apparatus having a structure attached to the side surface of a rail abdomen is used. By incorporating it, it is not limited to use as a snow melting device that generates an eddy current directly on the rail abdomen.

[Brief description of the drawings]

FIG. 1 is a top view of a state in which a snow melting apparatus according to an embodiment of the present invention is installed at a point portion.

FIG. 2 is a side view showing a state in which the snow melting apparatus according to one embodiment of the present invention is installed at a point portion.

FIG. 3 is a plan view of the snow melting apparatus of FIG. 1;

FIG. 4 is a diagram showing an upper surface side and a lower surface side of a heater main body constituting the snow melting apparatus.

FIG. 5 is a plan view of a substrate constituting the heater main body.

FIG. 6 is a diagram showing a partially enlarged cross section of the heater main body.

FIG. 7 is a view for explaining a procedure for attaching the snow melting apparatus of FIG. 1;

FIG. 8 is a diagram showing a cross section of a floor plate on which a heater main body is loaded.

FIG. 9 is a view showing a cross section of a floor plate in which a heater main body is loaded together with a high heat conductive member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pillar 2 Floor board 21 Space part 22 Insertion opening 3 Rail 4 Snow melting device 41 Heater body 411 Induction coil 412 Board 42 Frame plate 43 Connector box 44 Power distribution cable 5 Fall prevention metal fitting 6 Spring piece 7 High heat conductive member

Claims (5)

[Claims] 1. A thin plate-shaped heater body in which a rectangular magnet wire having an air-core single-layer winding structure or a plurality of induction coils arranged in the same plane and covered with an insulator is provided with a ferromagnetic material supporting a rail. An induction heating snow melting apparatus characterized in that it is disposed in a space provided inside a floor panel made of steel, and supplies power to a heater body to induction heat the floor panel. 2. The induction-heated snow melting apparatus according to claim 1, wherein a plurality of induction coils are continuously integrated using one magnet wire. 3. The heater body according to claim 1, wherein a pressing member such as a spring piece that partially contacts the lower surface of the heater body is provided in the space inside the floor plate together with the heater body, and the upper surface side of the heater body is pressed against the floor plate. 3. The induction heating snow melting apparatus according to 1 or 2. 4. The induction-heated snowmelt according to claim 1, wherein a high heat conductive member such as a copper plate is arranged on the upper surface of the heater body so that the entire floor plate is uniformly heated. apparatus. 5. An induction coil having a flat rectangular magnet wire having an air core single layer winding structure and an iron coil having a flat rectangular magnet wire having an iron core single layer winding structure or a multi-layer winding structure. An induction-heating snow melting apparatus according to any one of claims 1 to 4.