RU114960U1 - ARROW ELECTRIC HEATING DEVICE - Google Patents

Abstract

A switch heating device containing a power source, temperature and precipitation sensors, a control system that regulates the intensity of heating, electric heaters, characterized in that the power supply generates an alternating current of high-average frequency, the control system operates on the principle of frequency regulation of the device's power, and as electric heaters, inductors are used, made in the form of conductors with a multi-wire conductive core of high conductivity in heat-resistant insulation and located on the surface of the neck and / or the foot of the rail of the switch, or on the surface of ferromagnetic sleepers.

Description

The utility model relates to the field of railway transport and is intended to increase reliability and ensure uninterrupted operation of switches and crossings in difficult winter conditions, and can be used to clean the turnouts and crossings from snow and ice in winter.

A device for cleaning the switch from snow and ice by electric heating "SIET-04", containing temperature and precipitation sensors, a power supply unit with a single-phase transformer, a switch, flat-oval electric heaters [utility patent No. 97386 dated 04/22/2010, IPC Е01В 7 / 24, EBB 19/00].

The disadvantages of this device include the low value of thermal and electrical efficiency, since the shooter is heated by transferring heat from electric heaters through their insulation and the air gap formed between the rail and the electric heater, which leads to large losses of thermal energy. In addition, due to the low specific energy consumption of the device, it is impossible to carry out heating with a high temperature gradient. Also a significant drawback of the device is the inability to smoothly control the heat transfer process, since the system works on an on-off basis.

Closest to the proposed technical solution is a device for electric heating of frame rails of railroad switches, selected as a prototype, containing an AC power source, temperature sensors, a control system that regulates the intensity of heating, and electric heaters, which are used for heating sections of frame rails [patent for utility model No. 104941 of 08/10/2010, IPC E01B 7/00].

The disadvantages of the prototype are the galvanic connection of the frame rails with the power source, which increases the risk of electric shock to the staff of the turnouts, the impact on the operation of the device of atmospheric phenomena in the form of heavy rain and the likelihood of water flooding sections of the frame rails to which the secondary windings of the transformer of the power source are connected, as well as the impossibility of smooth regulation of the heat transfer process, since the system in this case is also controlled by the principle of "on-off".

The technical tasks of the device are to increase the efficiency of heat transfer, reduce energy costs, increase reliability and ensure uninterrupted operation, and, accordingly, the work of arrows and crossings in difficult winter conditions

The task is achieved by the fact that in the turnout heating device containing an electric power source, temperature and precipitation sensors, a control system that regulates the heating intensity, electric heaters, an electric power source generates alternating current of high-medium frequency, the control system works on the principle of frequency regulation of the device’s power, and as electric heaters are used inducers made in the form of conductors with a multi-wire conductive core of high Qdim a thermally isolated, and arranged on the surface of the neck and / or sole track switch rail or on the surface of ferromagnetic sleepers.

Figure 1 shows a switchgear electric heating device containing a power source of alternating current of extra-medium frequency 1, rail temperature sensors 2, outdoor temperature sensor 3, precipitation sensor 4, control system 5, regulating the intensity of heating, electric heaters - inductors 6, frame rails 7.

Figure 2 presents the same device for electrical heating of the turnout switch, electric heaters - inductors 6 of which are located on ferromagnetic sleepers 8.

The proposed device operates as follows. From the power source with alternating current of extra-medium frequency 1, power is supplied to the inductors 6, through which current will flow and create a magnetic field that acts on the frame rail 7, or on the ferromagnetic sleepers 8. Arising in the metal body of the frame rail 7 (or in ferromagnetic sleepers 8) eddy currents provide heating of the rail (sleepers), and the process of ice melting and snow melting. Depending on the readings of the temperature sensors of the rail (sleepers) 2, outside air 3, precipitation 4, the control system 5 regulates the heating intensity by changing the frequency generated by the current power source.

Improving the heat transfer efficiency is achieved by the fact that the heat source is directly the frame rail (sleeper), thereby eliminating zones with a low heat transfer coefficient from the heat transfer process, minimizing the loss of thermal energy, and reducing energy costs. The lack of galvanic connection between the electric heater and the rail (sleepers) increases reliability and ensures uninterrupted operation of the device.

Claims (1)

The turnout heating device, containing a power source, temperature and precipitation sensors, a control system that regulates the intensity of heating, electric heaters, characterized in that the power source generates alternating current of high-medium frequency, the control system works on the principle of frequency control of the device’s power, and as electric heaters use inductors made in the form of conductors with a multi-wire conductive core of high conductivity in heat-resistant insulation and located on the surface of the neck and / or sole of the rail of the turnout switch, or on the surface of ferromagnetic sleepers.