JPH09296404A - Track heating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a track heating apparatus for which connecting cables can be reduced while installation being made easy. SOLUTION: A track heating apparatus 10 comprises of an induction device 14, being constructed of cores 52 and a coil 12, and is installed to a track 60 and with an alternating current from an electric source impressed to the induction device 14, the track 60 is heated by eddy current. The coil 12 is made up by forming an electric wire into a long looplike shape along the lateral of the track 60 in its longitudinal direction. The cores 52 are installed in plural numbers to the lateral of the track 60, each astriding the coil 12 formed in the long looplike shape, at intervals in the longitudinal direction of the track 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent a rail, particularly a branch portion of the rail, from freezing due to snow or the like.
The present invention relates to a rail heating device that heats a rail with an eddy current.

[0002]

2. Description of the Related Art Conventionally, as a rail heating device for heating a rail by eddy current, there is one disclosed in Japanese Utility Model Laid-Open No. 1-160601. The outline of the configuration of the rail heating device 50 will be described with reference to FIG. The rail heating device 50
The induction device 56 includes a core 52 and a coil 54, and a power source 58 that applies an alternating current to the induction device 56. The induction device 56 is formed by winding a coil 54 around a protrusion portion in the center of a core 52 having an E-shaped cross section, and by applying an alternating current to the coil 54, the induction device 56 is introduced into the core 52. An alternating magnetic field is generated. Therefore, when the guiding device 56 is installed on the side surface of the rail 60 so that the opening side of the core 52 faces the side surface of the rail 60, this alternating magnetic field is also transmitted to the rail 60 which is a conductor, and the alternating magnetic field causes the alternating magnetic field. Eddy current is generated inside the rail 60.
Then, heat is generated in the rail 60 due to the ohmic loss of the eddy current, the temperature of the rail 60 rises, and the freezing can be prevented.

[0003]

However, the above-mentioned conventional rail heating device has the following problems. The eddy current generated in the rail 60 by one induction device 56 does not reach the whole of the long rail 60, depending on the strength of the alternating magnetic field, and therefore the heat generation is extremely local. Therefore, when it is necessary to heat the entire rail 60, as shown in FIG. 4, a plurality of guide devices 56 are installed at intervals along the length direction of the rail 60, and each of these guide devices 56 is powered. It is necessary to connect 58 to each of them by a dedicated connection cable 62.

Therefore, the number of connecting cables 62 increases, and it takes time to install the cables. In addition, since the number of the connection cables 62 increases, the connection cables 62
The weight also increases, and a large fixing metal fitting is required for routing, which increases the cost. In addition, since the number of wirings is large, the number of connection points of the wirings increases, and the wirings are generally complicated. In particular, the rail 60 is movably constructed at the branching portion of the rail, and if the wiring is complicated, the connecting cable 6
2 is disengaged from the fixing metal fitting and is sandwiched between the rail 60 and the floor plate, and the coating is torn, and a failure such as a short circuit is likely to occur.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a rail heating device which can reduce the number of connecting cables and can be easily installed.

[0006]

The present invention has the following constitution in order to achieve the above object. That is, in a rail heating device in which an induction device including a core and a coil is provided on a rail, and an alternating current is applied to the induction device to heat the rail by eddy current, the coil is provided on a side surface of the rail. It is formed by winding an electric wire in a long annular shape along the longitudinal direction of the rail, and the core is formed on the side surface of the rail along the longitudinal direction of the rail so as to straddle the annularly formed coil. It is characterized by multiple installations at intervals. With this configuration, one set of coils is enough,
Wiring to a power supply that supplies alternating current can be reduced, and it is not necessary to wind an electric wire around the core itself. Also,
When the core is formed so as to have an E-shaped cross section, and is installed so that the opposing sides of the coil formed in an annular shape pass through the gap between the two cores, the magnetic flux generated around the electric wire is generated. Can be efficiently transmitted to the rail side.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a rail heating device according to the present invention will be described in detail below with reference to the accompanying drawings. First, the configuration of the rail heating device 10 will be described with reference to FIGS. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. As in the conventional example, the rail heating device 10 has a basic configuration including an induction device 14 including a core 52 and a coil 12, and a power source 58 that applies an alternating current to the induction device 14. 14
The configurations are different.

Next, the structure of the guiding device 14 will be described in detail. The coil 12 has a rail 6 as shown in FIGS.
On the side surface of No. 0, the electric wire is wound in one long annular shape along the longitudinal direction of the rail 60. As a method of fixing the electric wire, for example, a clamp material may be adhered to the side surface of the rail 60 and the electric wire may be fixed to the side surface of the rail 60 using this clamp material.
In addition, the rail 60 is a movable rail 60 used at a branch portion.
However, the rail 60 may be a general fixed rail 60.

Since the coil 12 is basically formed by winding one electric wire, it is only necessary to provide two connecting cables 62 between the coil 12 and the power source 58. The coil 12
In order to generate a large magnetic field, it is necessary to pass a large current, but in this case there is a risk that the allowable current value of one wire will be exceeded. 12 may be formed. Even in this case, it is sufficient to provide the two connecting cables 62 between the power source 58 and the coil 12. An alternating current is supplied to the coil 12 from the power supply 58 via the connection cable 62.

In this embodiment, the core 52 has a cross section formed in an E-shape as in the conventional example. The core 52 is attached to the side surface of the rail 60 so that the opposite sides 12a and 12b of the coil 12 formed in an annular shape respectively pass between the two gaps 16a and 16b of the core 52 as shown in FIG. . Further, in order to efficiently and efficiently heat the long rail 60, a plurality of cores 52 are installed at intervals along the longitudinal direction of the rail 60 (FIGS. 1 and 2).
reference). That is, each core 52 has a structure that shares one coil 12 formed in a ring shape. In the present embodiment, the core 5 having an E-shaped cross section is provided so that the magnetic flux generated in the coil 12 can be efficiently transmitted to the rail side.
2 is used, but with a U-shaped core 52,
One of opposite sides 1 of the coil 12 formed in a ring shape
The structure may be such that it is attached to the side surface of the rail 60 so as to straddle only 2a and 12b.

Next, the operation will be described. When an alternating current is applied to the coil 12 from the power supply 58, the alternating current flows through the electric wire forming the coil 12, so that an alternating magnetic field is generated in the coil 12. This magnetic field acts on the rail 60,
An eddy current is generated in the rail 60. When an eddy current is generated in the rail 60, ohmic loss occurs in the rail 60 and the temperature of the rail 60 rises, as described in the conventional example. Therefore, it is possible to prevent the rail 60 from freezing.

Further, in the present embodiment, the coil 12 is not used in an air-core state, but the cores 52 are installed in the coil 12 at predetermined intervals so that the opening side faces the side surface of the rail 60. . Therefore, the coil 12 is covered with the core 52 at the portion where the core 52 is attached,
Since the magnetic circuit is formed in a closed circuit by the core 52 and the rail 60, the magnetic field generated in the coil 12 can be efficiently transferred to the rail 60.
Since the eddy current generated in the rail 60 is larger than that in the air core state, the temperature of the place where the coil 12 is installed rises intensively. Therefore, by disposing the plurality of cores 52 at appropriate intervals in the long coil 12 attached to the side surface of the rail 60, the entire rail 60 can be efficiently heated.

Although the preferred embodiments of the present invention have been described in various ways, the present invention is not limited to the above-described embodiments, and it is noted that many modifications can be made without departing from the spirit of the invention. Of course.

[0014]

When the rail heating device according to the present invention is used,
It is possible to reduce the number of connecting cables between the coil installed on the rail and the power supply that supplies an alternating current to the coil to a minimum of two compared to the conventional one, and the number of connecting points of wiring is reduced. Installation can be done easily in a short time. Further, since the number of connecting cables is small, the wiring can be laid out in an orderly manner.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a rail heating device according to the present invention.

FIG. 2 is a front view of FIG.

3 is a cross-sectional view taken along the line AA of FIG. 2 showing a positional relationship between a coil attached to a rail and a core.

FIG. 4 is a front view showing an example of a conventional rail heating device.

[Explanation of symbols]

 10 rail heating device 12 coil 14 induction device 52 core 58 power supply 60 rail

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Ideno 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Inventor Yoshiharu Murakami 1-6-5 Marunouchi, Chiyoda-ku, Tokyo Issue East Japan Railway Company (72) Inventor Yoshifumi Denda 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Inventor Fumihiko Sakamoto 2210 Tsuruga Gondocho, Nagano City, Nagano Prefecture No. B Nichinanda Electric Co., Ltd.

Claims (2)

[Claims] 1. A rail heating device in which an induction device including a core and a coil is provided on a rail, and an alternating current is applied to the induction device to heat the rail by an eddy current, wherein the coil is a side surface of the rail. In the longitudinal direction of the rail, the core is formed by winding an electric wire in a long annular shape, and the core is formed on a side surface of the rail so that the core extends in the longitudinal direction of the rail. The rail heating device is characterized in that a plurality of rail heating devices are installed at intervals along the line. 2. The core is formed to have an E-shaped cross section, and is installed so that each opposing side of the coil formed in an annular shape passes through a gap between two cores. The rail heating device according to 1.