US3648017A

US3648017A - Device for deicing rails

Info

Publication number: US3648017A
Application number: US41330A
Authority: US
Inventors: Yoshiyuki Obata
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1969-06-06
Filing date: 1970-05-28
Publication date: 1972-03-07
Anticipated expiration: 1989-03-07
Also published as: FR2050042A5; DE2027525A1; CH525327A; DE2027525B2

Abstract

Two parallel rails of a track are magnetically interconnected to cause an alternating current magnetic flux to flow through them. The rails are self-heated with the iron loss caused in them due to the flow of magnetic flux to be deiced.

Description

United States Patent Obata 1 51 Mar. 7, 1972 [54] DEVICE FOR DEICING RAILS [56] References Cited [72] Inventor: Yoshiyuki Obata, Kobe, Japan UNlTED STATES E S I731 Assign Mitsubishi Kabushiki Kaisha, 2,223,970 12/1940 Stansel ..219/10.s7 JaPa 3,530,499 9/1970 Schroeder.... ..219/10.49

[22] Filed: May 28, 1970 FOREIGN PATENTS OR APPLICATIONS [21] Appl. No.: 41,330

508,104 9/1930 Germany ..219/2l3 [30] Foreign Application Priority Data Primary Examiner c. L Mbrimn June 6, 1969 Japan ..44l44468 Attorney-Robert E. Burns and Emmanuel J. Lobato [52] 11.8. CI ..219/2l3, 104/279, 219/1057 [57] ABSTRACT [51] Int. Cl. "1105b 5/08 [58] Field at Search ..214/10.49, 10.57, 50,213; TWO Parallel rails of a track are magnetically merwnnecwd 104/279; 246/428; 307/68 10 cause an alternating current magnetic flux to flow through them. The rails are self-heated with the iron loss caused in them due to the flow of magnetic flux to be deiced.

15 Claims, 4 Drawing Figures 1 a J 3 4 4:1 U U 1 1 1 Q 2; 1 4K, 51

B 2 E; E 2 E 3 6 E 4 A. C. lNPUTS Patented March 7, 1972 A. C. INPUTS A.C. INPUT A.C. INPUT A.C. INPUT 2 E B2 l 2 l A.C. INPUT DEVICE FOR DEICING RAILS BACKGROUND'OF THE INVENTION This invention relates to a device for deicing a railroad during the cold season.

During the cold season railroad lines can often have ice and/or crystallized snow stuck thereon. Such ice and/or crystallized snow accumulated on the railroad line may cause vehicles to slip along the line during acceleration or deceleration thereby providing an obstacle to traffic service and may even cause the vehicles to be derailed.

SUMMARY OF THE INVENTION Accordingly it is an object of the invention to prevent ice and/or crystallized snow from sticking on rails of the line by preliminarily melting the same.

The invention accomplishes this object by the provision of a device for deicing a railroad line including at least two parallel rails, comprising an exciting element for supplying an alternating current magnetic flux across the rails, and a source of alternating current for energizing the exciting element, the arrangement being such that the alternating current magnetic flux passes through the rails to cause an iron loss in each of the rails thereby to deice the rails.

In a preferred embodiment of the invention the deicing device may comprises a magnetic member for magnetically interconnecting the rails on the undersides, a winding inductively disposed around the magnetic member, and a source of alternating current for energizing the winding to induce an alternating current magnetic flux in the magnetic member, the magnetic flux being caused to flow through the rails to cause a iron loss in each of the rails thereby to deice the rails.

BRIEF DESCRIPTION OF THE DRAWING The invention will become more readily apparent from the following detailed description taken in conjunction with the accompanying drawing in which:

FIG. I is a fragmental schematic circuit diagram of a deicing device constructed in accordance with the principles of the invention;

FIG. 2 is a cross-sectional view of the deicing device shown in FIG. I and illustrating one exciting element in more detail; and

FIGS. 3A and B are views similar to FIG. 1 but illustrating two different modifications of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIG. 1 of the drawing, it is seen that an arrangement disclosed herein comprises a pair of rails B, and B, disposed in spaced parallel relationship and a plurality of magnetic flux means generally designated by the reference characters U,, U U and U, and disposed at predetermined intervals across the rails B, and B The magnetic flux means U,, U U or U, includes a magnetic core C,, C C or C, of any suitable magnetic material such as silicon steel connected across the rails B, and 3,, an exciting element or winding W,, W W or W, inductively disposed around each magnetic core and a source of alternating current E,, E E, or E, connected across each of the winding W,, W W, or W, to energize the latter and flow sufficient exciting current therethrough to produce a magnetic flux of alternating current in the associated magnetic core. The magnetic fluxes thus produced will then flow through the rails B, and B,. As shown at the solid or dotted arrows denoted alongside the magnetic cores, the magnetic fluxes thus produced have preferably their instantaneous polarities alternating from one another for the purpose of facilitating the circulation of the fluxes through the rails. It is to be noted that as signal voltages for trains are normally 'applied across the rails, the magnetic cores should be electrically isolated from the rails by any suitable means such as will be described hereinafter. However, it will readily be understood that for railroad along which cargo crane cars travel, the magnetic cores are not required to be electrically isolated from the rails.

While four magnetic flux means are illustrated in FIG. I it is to be understood that the number of "such means may be greater or smaller than four. i

All the magnetic flux means U are identical in construction to one another and only one thereof will be described in detail. FIG. 2 shows a cross section of one of the magnetic flux means, forexample the magnetic flux means U,. As shown in FIG. 2, a pair of rails B, and B, disposed'in opposite parallel relationship have the respective lower faces interconnected through a U-shaped magnetic core including a .pair of L- shaped magnetic core portions C, and C and an electric insulation D, sandwiched between the opposited ends of the core portions. Thus it will be appreciated that both rails B, and B are electrically isolated from each other by the insulation D, ensuring that any signal voltage for trains is prevented from shortcircuiting through the magnetic core C -C Then an exciting winding W, is inductively disposed around both the magnetic core portions C and C and connected across the source of alternating current E,.

In operation, the source E, energizes the exciting winding W, to produce in the magnetic core portions C and C a magnetic flux of alternating current which, in turn, circulates through the rails B, and B The circulation of the flux through the rails causes the generation of heat in the rails as previously described. The succeeding magnetic flux means are arranged to produce the magnetic fluxes having the instantaneous polarities alternating from one another so that the fluxes can effectively flow through the rails to increase the temperature thereof. It will readily be understood that the quantity of heat generated in the rails and therefore the temperatures thereof can be controlled by adjusting the magnitudes of the respectivefluxes.

The magnetic core portions of each magnetic flux means U,, U, may preferably be a stack of laminations of any suitable magnetic material such as sheet, silicon-steel low in magnetic loss in order to eliminate or minimize the eddy current loss caused in the magnetic core portions. The magnetic flux means each are conveniently disposed between adjacent sleepers for the rails without hindrance.

While the magnetic flux means are shown as being connected across their own sources of alternating current, it is to be understood that a plurality of magnetic flux means may be connected across a common source of alternating current with satisfactory results. In the latter case, one of the rails is utilized to form one part of the circuit for energizing the individual exciting winding. 7

FIG. 3A, wherein like reference characters designate the components identical or corresponding to those shown in FIG. 1, illustrates a modification of the invention. More specifically, the source E is connected at one side to one of the rails, in this case the rail 3,, and all the exciting windings W,, W W and W, are connected across the rail 8, and the other side of the source E with the magnetic core composed of two pertions C,, and C electrically isolated from each other. In other respects the arrangement is identical to that shown in FIG. 1.

FIG. 38, wherein like reference characters designate the components identical or corresponding to those shown in FIG. 1 or 3A, illustrates another modification of the invention. A selected number of the exciting windings, in the illustrated example, two windings W, and W are connected in series circuit relationships across the source E, through that portion disposed between both windings of the rail 8,. The remaining windings W and W, are connected in the similar manner across another source E In other respects the arrangement is identical to that shown in FIG. 3A. While the arrangement of FIG. 38 includes the two separate sources E, and B, it is to be understood that with thesourcescomprising, for example, transformers, their primary windings are not required to be electrically isolated from each other. It is sufficient to energize the series combinations of the exciting windings by the respective sources electrically insulated from one another. For example, it is possible to use a single transformer including a plurality of separate secondary windings.

While the invention has been illustrated and described in conjunction with a few preferred embodiments thereof it is to be understood that various changes and modifications may be resorted to without departing from the spirit and scope of the invention. For example, the invention is equally applicable to more than two rails. Also the exciting windings may be energized in any of the manners different from those shown in FIGS. 3A and B and which would be apparent to those skilled in the art.

What is claimed is:

l. A device for deicing a railroad line including at least two parallel rails, comprising: an exciting element operable when energized to supply an alternating current magnetic flux across the rails, and means including a source of alternating current for energizing the exciting element to develop an alternating current magnetic flux flowing through the rails to cause an iron loss in each of the rails of sufficient magnitude to effect deicing of the rails.

2. A rail deicing device as claimed in claim 1 wherein said means for energizing the exciting element includes at least one portion of the rail.

3. A rail deicing device as claimed in claim 1 wherein the exciting element includes a magnetic core for magnetically interconnecting the rails on the lower surfaces thereof, and an exciting winding inductively disposed around the magnetic core and connected to be energized by the source.

4. A rail deicing device as claimed in claim 1 wherein the exciting element includes a magnetic core for magnetically interconnecting the rails on the lower surfaces thereof, the magnetic core having an electric insulation interposed therein, and an exciting winding inductively disposed around the magnetic core and connected to be energized by the source.

5. A rail deicing device as claimed in claim 1 wherein the exciting element includes a magnetic core of lamination type for magnetically interconnecting the rails on the lower surfaces thereof, and wherein the magnetic core has an electric insulation interposed therein.

6. A device for deicing a railroad line including at least two parallel rails, comprising: a source of alternating current a magnetic core magnetically interconnecting said two rails and including means maintaining said two rails electrically insulated from each other and alternating current exciting means disposed between said two rails and including an exciting winding disposed around said magnetic core energizable by said source to produce an alternating current magnetic flux flowing from said magnetic core into said rails to develop an iron loss in each of said rails of sufficient magnitude to selfheat the rails to a temperature effective to deice same.

7. A deicing device as claimed in claim 6, including means electrically connecting at least one portion of the rail to said exciting winding whereby said exciting winding is energized by said source through at least said one portion of said rail.

8. A deicing device as claimed in claim 6 wherein said magnetic core has interposed thereinto a section of electric insulation for electrically dividing the magnetic core into two parts in the axial direction thereof.

9. A device for deicing a railroad line including at least two parallel rails, comprising: a source of alternating current; at least two alternating current exciting means disposed between said two rails and spaced apart from each other along the length of the rails at predetermined intervals and each including an exciting winding energizable by said source to produce respective alternating current magnetic fluxes; and one magnetic core magnetically coupled to each said exciting winding to magnetically interconnect said two rails while said rails are maintained electrically insulated from each other and wherein the two adjacent magnetic cores and those portions of said rails disposed therebetween define a closed loop magnetic circuit in which the alternating current magnetic flux'produced by one of the associated alternating current exciting means is added to that produced by the other of the associated alternatmg current exciting means to develop an ll'Ol'l loss in each of those portions of the rails disposed between said two magnetic cores of sufficient magnitude to self-heat the rails to a tem perature effective to deice same.

10. A deicing device as claimed in claim 9 wherein said alternating current exciting means are energized by said source through at least one portion of said rail.

11. In combination: a pair of spaced-apart and parallel rails lying in situs and overwhich vehicles may ride; a magnetic core member interconnecting said pair of rails and having means therein electrically insulating said pair of rails from each other; and magnetic flux generating means magnetically coupled to said magnetic core member for developing a varying magnetic flux flowing from said magnetic core member into said rails to induce eddy currents of sufficient strength in said rails to heat said rails to a temperature effective to deice same.

12. A combination according to claim 11; including means locating said magnetic core member and said magnetic flux generating means sufficiently away from the riding surface of said rails to allow vehicles to ride on said rails while same are being heated.

13. A combination according to claim 12; wherein said magnetic flux generating means comprises an exciting winding disposed around said magnetic core member, and alternating current means connected to said exciting winding for flowing sufficient exciting current therethrough to develop said varying magnetic flux.

14. A combination according to claim 13; including means electrically connecting said exciting winding in series with a portion of one of said rails and said alternating current means whereby said exciting current flows through said rail portion.

15. A combination according to claim 12; wherein said means electrically insulating said pair of rails from each other comprises a section of electric insulation effectively dividing said magnetic core member into two sections.

Claims

1. A device for deicing a railroad line including at least two parallel rails, comprising: an exciting element operable when energized to supply an alternating current magnetic flux across the rails, and means including a source of alternating current for energizing the exciting element to develop an alternating current magnetic flux flowing through the rails to cause an iron loss in each of the rails of sufficient magnitude to effect deicing of the rails.

6. A device for deicing a railroad line including at least two parallel rails, comprising: a source of alternating current a magnetic core magnetically interconnecting said two rails and including means maintaining said two rails electrically insulated from each other and alternating current exciting means disposed between said two rails and including an exciting winding disposed around said magnetic core energizable by said source to produce an alternating current mAgnetic flux flowing from said magnetic core into said rails to develop an iron loss in each of said rails of sufficient magnitude to self-heat the rails to a temperature effective to deice same.

9. A device for deicing a railroad line including at least two parallel rails, comprising: a source of alternating current; at least two alternating current exciting means disposed between said two rails and spaced apart from each other along the length of the rails at predetermined intervals and each including an exciting winding energizable by said source to produce respective alternating current magnetic fluxes; and one magnetic core magnetically coupled to each said exciting winding to magnetically interconnect said two rails while said rails are maintained electrically insulated from each other and wherein the two adjacent magnetic cores and those portions of said rails disposed therebetween define a closed loop magnetic circuit in which the alternating current magnetic flux produced by one of the associated alternating current exciting means is added to that produced by the other of the associated alternating current exciting means to develop an iron loss in each of those portions of the rails disposed between said two magnetic cores of sufficient magnitude to self-heat the rails to a temperature effective to deice same.