JP4188521B2 - Induction heating type snow melting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a snow melting device that heats a floor board by loading a heater inside the floor board that supports a rail, and an induction coil is incorporated in the heater and the floor board is heated by an induced magnetic field.
[0002]
[Prior art]
A snow melting device that heats the point part is attached to the rail point part for railroads and tracks and its peripheral part (hereinafter referred to as the point part) in order to prevent the snow from adhering to and freezing. It is done.
As one, inside the heating element is attached to the floor to be laid on the rail under side, floorboards plug-snow melting device for melting snow point portion by heating the floorboards are known in heat heating element emits (actual No. 1-18643, etc.).
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 snow melters are known ( Japanese Utility Model Laid-Open No. 1-150601 ).
[0003]
[Problems to be solved by the invention]
Among the prior arts, in the former, since the heating element is housed in the floor board, although the amount of heat directly dissipated from the heating element into the atmosphere is small, the heating of the point part is performed secondarily through the heating element. However, there is a problem that a loss occurs when heat is conducted from the heating element to the floor board, the heating efficiency for the point portion is poor, and power consumption is large.
In the latter, since the rail generates heat directly and there is no loss other than the internal heating of the induction coil, in principle the heating efficiency for the point part can be improved compared to the heating method using a heating element, Since the number of windings of the induction coil is small, the inductive coupling rate is poor, and there is a problem that a dedicated power supply device having a higher frequency than the commercial power supply must be used to induce a magnetic field sufficient for the rail to generate heat.
[0004]
On the other hand, in technical fields other than this type of snow melting device, a device for induction heating using a spiral induction coil is known (Japanese Patent Laid-Open No. 60-89), and this is used for heating the point portion. It is also possible. However, as described above, the induction heating type snow melting device has firstly a structure that is seismic and weather resistant and can be stably installed on the point portion, and secondly, the point portion is large enough to generate heat. In addition, it is necessary to induce a magnetic field with a small loss of the amount of generated heat, and thirdly, it must be easy to install on site, and a known spiral induction coil cannot be applied to a snow melting device as it is.
[0005]
SUMMARY OF THE INVENTION In view of such problems, the present invention is an apparatus for melting snow at a point portion using an induction coil, and can be installed stably and easily, and it is possible to induce and heat a large magnetic field at the point portion. And
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a snow melting device that heats a floor board installed in a space provided inside an iron floor board that supports a rail, and generates a eddy current by an induced magnetic field. This is an induction heating method that directly heats the part, and has an air-core multi-layer winding structure in which a rectangular magnet wire whose surface is covered with an insulating resin is wound closely in a concentric spiral shape without opening a gap between adjacent wires. a plurality of induction coils are connected in series arranged in a row on the upper surface of a rectangular substrate, and each entire induction coil a thin plate-like heater body formed is fixed to the substrate being coated with an insulator, the A plate-like high heat conductive member is placed on the upper surface and disposed in the space, and a commercial frequency power supply voltage is supplied to the heater body to inductively heat the floor plate.
[0007]
According to this, by arranging the heater body equipped with the induction coil inside the floor plate, the magnetic field can be guided to the floor plate without leakage, and the gap (distance) between the heater body and the floor plate is also small, so the floor plate is efficient. It is possible to generate eddy current and generate heat.
In addition, since the number of turns of the induction coil can be increased by using a flat magnet wire, a magnetic field can be induced with a large magnetic flux density on the floor plate, and the eddy current of the heated body becomes large. A calorific value sufficient to melt the snow at the point can be obtained.
The heater body is formed by covering the entire induction coil with an insulator, so it has excellent durability against rainwater and dust, and the connection wiring does not come off even when subjected to shock or vibration, and is stable within the floorboard. Can be installed in. Moreover, since this apparatus is a floor board insertion type, installation and removal work are also easy.
[0008]
The heater body can be configured using an appropriate number of induction coils according to the installation conditions such as the size of the space inside the floorboard and the required amount of heat generation.
Specifically, for example, an induction coil is placed on a thin plate made of an insulating material as a substrate, and when a plurality of induction coils are used, they are arranged side by side, and both ends of the coil are placed on the upper and lower surfaces of the substrate so as not to cause a short circuit. Each of them is routed and wired, and then the induction coil and the substrate are integrally molded with an insulating resin such as silicon or an insulating material such as rubber, and the whole is covered with an insulating resin film such as Teflon. If the insulating coil can be insulated and sealed by winding the insulating resin film around the induction coil and the substrate, they can be integrated even if the molding process using an insulator is omitted.
[0009]
In the above-described configuration, the heater main body may be configured by continuously integrating a plurality of induction coils with a single magnet wire, and having no connection portion of the conductive wire other than the connection portion with the power supply terminal.
[0010]
Moreover, in the said structure, it is preferable to provide a pressing member, such as a spring piece which contacts a lower surface of a heater main body, in the space part inside a floor board with a heater main body so that the upper surface side of a heater main body may press-contact with a floor board.
If the upper surface of the heater body is in pressure contact with the floor plate, the induction coil and the floor plate that is the object to be heated can be kept close to each other, so eddy currents are generated efficiently and wastefully on the upper surface of the floor plate that supports the rail. The amount can be increased.
Further, if a pressing member is provided on the lower side of the heater body, the heater body and the floor board are in close contact with each other, the heater body is stably fixed, and a gap is formed between the lower part of the floor board space and the heater body. Is formed, and the pressing member has a structure in which the lower surface of the heater body is in partial contact with the lower surface of the heater body, the area where the lower surface of the heater body is in contact with other members is reduced and the thermal insulation in the lower surface direction is increased. It is possible to improve the heating efficiency for the floor board by reducing the heat radiation to the direction other than the heated body direction, that is, the direction other than the upper surface of the heater body. The temperature of the insulator portion of the heater body can also be kept relatively low.
As the pressing member, a spring piece, a spring coil, an elastic body such as rubber, and other appropriate members that act to press the heater body upward can be used.
[0011]
Furthermore, in the said structure, it is preferable to arrange | position high heat conductive members, such as a copper plate, on a heater main body upper surface so that the whole floor board may be heated uniformly.
When the floor plate is heated through the induction coil, the amount of heat generated is different between the strong and weak portions of the induction magnetic field, and the heat generation is uneven within the floor plate. If this is provided, the temperature of the entire upper surface of the floor plate can be increased uniformly and uniformly through the heat conducting member.
In addition, as the high thermal conductivity member, a member having high thermal conductivity such as copper can be used, and it is preferable to use a member having a size that can be joined to the entire upper surface of the heater body or the entire upper surface of the space.
[0012]
Further, Oite the above configuration, it is greater to increase the heating value of the induced magnetic field by using an inductive coil a rectangular magnet wire was air-core multilayer winding structure becomes possible.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The snow melting device of the present invention is a snow melting device of the type that heats the floor plate from the inside and melts snow at the point portion, and as the heating method, the eddy current is generated and the floor plate itself is directly heated and accompanied with the excitation coil loss. This is a system in which the heat generation energy is more efficiently transmitted to the floor plate that is the object to be heated. Preferred embodiments of the present invention will be described below with reference to the drawings.
[0014]
FIG.1 and FIG.2 has shown the point part in which the snow melting apparatus of this invention was installed. In the figure, reference numeral 1 is a pillar, 2 is an iron floor fixed to the upper surface of the pillar, 3 is a rail supported on the upper surface of the floor, 4 is a snow melting device, and 5 is a drop prevention for fixing the position of the snow melting device. It is a metal fitting. The floor plate 2 is provided with a space portion 21 having a size capable of disposing at least a heater main body, which will be described later, and an insertion port 22 communicating with the space portion is formed on a side surface (see FIG. 7).
[0015]
As shown in FIG. 3, the snow melting device 4 of this example includes a heater main body 41, a frame plate 42 that supports the heater main body, a connector box 43 attached to an end of the frame plate, and a power distribution cable 44. ing.
[0016]
As shown in FIG. 4, the heater body 41 includes four induction coils 411 formed by densely winding a conductive wire in a flat spiral shape, and these are arranged in a row on a substrate 412 made of an insulating material. They are connected in series, and the surface of each coil and substrate is covered with an insulator to form a thin plate.
[0017]
Specifically, the four induction coils 411 are continuously integrated by a single flat magnet wire 411a whose surface is coated with an insulating resin 411b, and the magnet wire is tightly wound with an air-core single layer. Each is juxtaposed on the upper surface of the substrate 412.
Further, as shown in FIG. 5, the substrate 412 has a rectangular shape in which the lateral direction is slightly larger than the diameter of the induction coil 411, and a predetermined interval is provided on one side thereof. The notch 412a is provided, and when the induction coil 411 is placed, an opening 412b is provided at a position overlapping with the center of each coil, and a slit 412c connected from the edge to each opening 412b is provided on the other side. It is provided and formed.
[0018]
In each coil, a wire portion extending from the outer periphery of the coil wound concentrically to the center of the adjacent coil is inserted into a notch 412a provided on the side portion of the substrate 412 and routed to the back side of the substrate, and further to the other side portion. The slit 412c is inserted into the slit, and the inside of the slit is shifted to the opening 412b. The coil is wound again concentrically from the opening 412b, and the wire portions of the intersecting coils are short-circuited across the substrate 412. Without being integrated with a single wire 411a.
[0019]
Each induction coil 411 juxtaposed on the substrate 412 is molded integrally with the substrate with an insulating resin 413 such as silicon or an insulating material such as rubber and solidified into a thin plate shape, and further, the whole is formed with an insulating resin film 414 such as Teflon. The heater body 41 is configured by being covered.
The induction coil 411 arranged on the substrate 412 may be thinly covered with a thin silicon rubber and press-molded to fix each coil on the substrate. The induction coil 411 may be insulated. If it can be fixed on the substrate 412, the molding step may be omitted, and for example, a Teflon adhesive tape may be wound around the induction coil 411 and the substrate 412 to be integrated.
[0020]
The heater body 41 molded in a thin plate shape is fixed to the upper surface of a dish-shaped frame plate 42 having a connector box 43 connected to the side, and the distribution cable 44 and the wires at both ends of the induction coil 411 group are connected in the connector box 43. Is connected. Silicon resin is injected into the boundary portion between the heater main body 41, the frame plate 42 and the connector box 43, and the wiring portion in the connector box 43, and is solidified integrally.
[0021]
As shown in FIG. 7, the snow melting device 4 configured in this way has a spring piece 6 formed by curving a rectangular steel plate in the short direction applied to the lower side of the heater body 41. Is loaded together with the spring piece 6 into the space 21 of the floor board 2 from the insertion port 22, and the drop-off prevention metal fitting 5 is engaged with the connector box 43 in contact with the side surface of the floor board 2 to be fixed on the pillar 1. .
[0022]
As shown in FIG. 8, the heater main body 41 loaded in the space portion 21 of the floor board 2 is pressed upward with the curved top portion of the spring piece 6 in contact with the substantially central portion of the lower surface thereof, and the induction coil. The upper surface on which 411 is juxtaposed is pressed against the upper surface portion of the floor plate 2 in close contact.
If the distribution cable 44 is energized in this state, an eddy current is generated in the floor plate 2 by the magnetic field induced by each induction coil 411, the upper surface portion of the floor plate 2 is heated by Joule heat generated thereby, and the point portion Can melt snow.
[0023]
In this case, the induction magnetic field is strong and weak depending on the arrangement position of each induction coil 411 that is in close contact with the floor plate 2, so that the amount of heat generation varies depending on the position of the floor plate 2, and temperature unevenness occurs in the floor plate 2, but is shown in FIG. As described above, if the high heat conductive member 7 such as a copper plate having a size to be joined to substantially the entire upper surface portion of the space portion 21 is installed on the upper surface of the heater body 41, the upper surface portion of the floor plate 2 is passed through the high heat conductive member 7. The temperature can be raised uniformly and uniformly.
[0024]
In addition, although the heater main body 41 of the Example comprised the four induction coils 411 arranged in a line, the use number and arrangement | positioning of an induction coil can be changed suitably. As the induction coil 411, a flat magnet wire having an air-core single-layer winding structure is used, but in order to obtain a larger induction magnetic field , a multi-layer winding structure may be used. The pressing member installed in the space portion 21 together with the heater main body 41 may be in a form other than the spring piece 6 as long as the pressing member is in partial contact with the lower surface of the heater main body 41 and presses the heater main body 41 upward. Can do.
[0025]
In addition, the apparatus of the present invention has a structure in which a heater main body incorporating an induction coil is inserted into a floor plate, but a conventional snow melting apparatus that is attached to the side of the rail abdomen has a built-in heater main body. Therefore, it is not limited to use as a snow melter that directly generates eddy currents in the rail abdomen.
[Brief description of the drawings]
FIG. 1 is a view of a snow melting device according to an embodiment of the present invention installed at a point portion as viewed from above.
FIG. 2 is a side view of a snow melting device according to an embodiment of the present invention installed at a point portion.
FIG. 3 is a plan view of the snow melting device of FIG. 1;
FIG. 4 is a view showing an upper surface side and a lower surface side of a heater body constituting the snow melting device.
FIG. 5 is a plan view of a substrate constituting the heater body.
FIG. 6 is a partial enlarged cross-sectional view of a heater body.
7 is a view for explaining a procedure for attaching the snow melting device of FIG. 1; FIG.
FIG. 8 is a diagram showing a cross-section of a floor board loaded with a heater body.
FIG. 9 is a view showing a cross section of a floor board in which a heater main body is loaded together with a high heat conduction member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pillar 2 Floor board 21 Space part 22 Insertion slot 3 Rail 4 Snow melting apparatus 41 Heater main body 411 Induction coil 412 Board | substrate 42 Frame board 43 Connector box 44 Power distribution cable 5 Fall-off prevention metal fitting 6 Spring piece 7 High heat conductive member

Claims (2)

A snow melting device that is installed in a space provided inside an iron floor plate that supports a rail and heats the floor plate,
A rectangular magnet wire with a plurality of air-core multi-layer winding structures, in which a flat rectangular magnet wire whose surface is covered with an insulating resin is closely wound in a concentric spiral shape without a gap between adjacent wires, is connected in series. A thin plate-like heater body arranged in a line on the upper surface of the substrate, and the entire induction coil is covered with an insulator and fixed on the substrate ,
An induction heating type snow melting device characterized in that a plate-like high heat conductive member is placed on the upper surface and arranged in the space, and a commercial frequency power supply voltage is supplied to a heater body to inductively heat the floor plate. 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 a high heat conductive member disposed on the upper surface of the heater body is pressed against the floor plate. The induction heating type snow melting apparatus according to claim 1 .

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