RU2263419C1 - Freight car foot heater - Google Patents

Abstract

FIELD: railroad transport, mechanical engineering.

SUBSTANCE: between lower end surface of multi-coil, multi-layer inductive coil and its heat insulation a slit air space is made in form of disk with central opening, in which along middle line of circle three flat sickle-shaped heads of air-guiding branch pipes are placed having multiple radially-directed recesses for forced letting through of cooling air. Cooling air forms protective air screen, preventing transfer of heat to multi-coil, multi-layer inductive coil from subject foot.

EFFECT: fast and balanced heating of working portion of foot to 600°C and higher.

3 dwg

Description

The invention relates to technological equipment of car repair enterprises of railway transport and is intended for heating the friars of freight cars to a temperature of 600 ° C and above during their repair.

In the existing practice of car repair enterprises, gas burners are used to heat the Fridays. However, this method is not able to ensure uniform heating of the metal of the working part of the Friday in depth and reach a temperature of 600 ° C and above. In addition, the heating process is time-consuming, requires significant manual labor and the consumption of combustible gas and oxygen.

A technical solution is known, which we took as a prototype (RU 2138138, C1 6 Н 05 В 6/40, С 21 D 9/00. Device for individual heating of the thrust bearings of the sprung beams of freight carriages. / Kruglov V.M., Popov S.I. ., Nikishin Yu.M. - Publish. 09/20/99 Bull. No. 26), allowing heating of the bearings to a temperature of 250-300 ° C. However, the design features of this device do not allow heating of the working part of the freight car's Friday to a temperature of 600 ° C and higher, due to overheating of the multi-turn, multi-layer induction coil with the heat of the heated Friday.

The purpose of the invention is the provision of fast and uniform in depth heating of the working part of the Friday to a temperature of 600 ° C and above.

This goal is achieved by the use of reliable protection of a multi-turn, multi-layer induction coil from overheating by heat of a heated Friday, the essence of which is that between it and thermal insulation there is a gap air gap designed to purge it with compressed air, the flow of which creates an air screen between a multi-turn, multi-layer induction coil and thermal insulation, which prevents the transfer of heat penetrating through thermal insulation from the Friday, which is absorbed by air shnny stream and is released into the atmosphere.

Figure 1 presents the heater of the fridays of freight cars in the context of aa in figure 2; figure 2 is the same in section along BB in figure 1; figure 3 is a section along BB in figure 1.

The wagon heater for trucks consists of a base 1, a multi-turn, multi-layer induction coil 2 attached to the base by means of three clamps 3, six U-shaped magnetic circuits 4, each of which can be limitedly moved in the guide angles 5 between the induction coil 2 and the base 1 in the direction perpendicular to the plane of the base. Between the base 1 and the magnetic circuits 4 there are gaskets 6 made of round spongy material to reduce noise during heater operation.

The movement of the magnetic circuits in radial directions is limited by a disk 7 made of an insulating material that insulates the upper end of the multi-turn, multi-layer induction coil from the guide angles 5. The induction coil is protected from mechanical damage by a casing 8 made of non-magnetic steel, which is fixed on the base 1 by three rods 9.

To protect the multi-turn, multi-layer induction coil 2 from overheating by heat of the heated Friday 10 between its lower end surface and thermal insulation 11, a slotted air gap 12 is made in the form of a disk with a hole in the center, purged with compressed air.

In the center of the base 1, an air distribution box 14 is fixed with a nut 13, which serves to distribute compressed air through three air ducts 15 with flat crescent tips 16 of oval cross section. Crescent tips 16 are placed in the slotted air gap 12 between the end surface of the induction coil 2 and the insulation 11 along the midline of the slotted air gap. To exit the air from the crescent tips 16, the latter have, on both sides of small oval-shaped radii, many radially directed drillings 17.

A flexible hose is connected to the fitting 18 for supplying compressed air from the workshop air duct.

To reduce pressure and regulate the flow of compressed air supplied to the heater, a pressure regulator and a flow regulator are provided. Compressed air pressure is controlled by a manometer. A shut-off valve is provided to shut off the compressed air supply. (Instruments for pressure and flow control, pressure control and shut-off valve are not shown in the drawings).

The findings of a multi-turn, multi-layer induction coil are connected to an alternating current source with a voltage of 220/380 V and a frequency of 50 Hz.

Turning the power and compressed air on and off is done from the control panel.

The proposed heater Fridays freight cars works as follows. The repaired Friday is placed on the rack with the attachment plane down. With the help of the lifting mechanism, the heater of the wagons on trucks is mounted on the Friday so that its vertical axis coincides with the center of the Friday 10, the casing 8 of the multi-turn, multi-layer induction coil 2 is aligned with the flat bearing surface of the Friday, the magnetic cores 4 were supported by the ends of the lower struts on the flat bearing surface of the Friday , and the inner cylindrical surface of the high struts adjoined to the persistent surface of the heel. From the control panel, the compressed air is supplied, which enters the air junction box 14, from where it is fed through the three nozzles 15 to the crescent tips 16 and blown through a plurality of radially directed drillings 17 to the center and periphery of the slotted air gap 12, creating an air screen that impedes the multi-turn transmission, a multilayer induction coil of heat penetrating through thermal insulation from a heated Friday. After making sure that the compressed air enters the slot air gap 12, a voltage is applied to the induction coil. In the latter, a current will flow, exciting a magnetic flux of alternating direction, which, closing through the magnetic circuits and the Friday, induces eddy currents heating it in the thickness of the metal of the Friday. When the set temperature is reached, the multi-turn, multi-layer induction coil is de-energized, the compressed air supply is shut off, and the heater of the wagons is removed. Friday is ready to carry out technological operations on it.

Thus, the proposed device allows you to heat the working part of the Friday of the freight car to a temperature of 600 ° C and above, without exposing the multi-turn, multi-layer induction coil to dangerous overheating.

The economic efficiency of the proposed technical solution is confirmed by its reliability and the absence of additional, more expensive devices (step-down transformer, frequency converter and other equipment and apparatus).

Claims (1)

A heater for the wagons of freight cars, containing a base on which a multi-turn, multi-layer ring induction coil is connected to an alternating current source of industrial frequency and voltage, thermal insulation, movable U-shaped magnetic circuits with racks of different heights with an inner cylindrical surface, characterized in that between the lower the end surface of a multiturn, multilayer induction coil and its thermal insulation is made slot air gap having the form of a disk with a hole in the center, in which there are three flat sickle-shaped tips of air ducts with many radially directed holes for forced passage of cooling air, which creates a protective air screen that prevents the transfer of heat to the multi-turn induction coil from the heated Friday.

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