SU953527A1 - Device for testing specimens for thermal stability - Google Patents

Description

(54) DEVICE FOR TESTING SAMPLES FOR THERMAL RESISTANCE

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The invention is fire testing equipment, namely, devices for testing samples for heat resistance.

A device for testing thermal shock samples is known, comprising a heating chamber and a cooling chamber, installed coaxially and rigidly interconnected, a thermally insulating wall with an opening installed between them, a container for placing samples U with a mechanism for its movement and a sealing system in the form of thermally insulating plugs, mounted on opposite ends of the container l.

A disadvantage of the known device is the difficulty of controlling the temperature change of the samples when the sample container is moved.

The closest to the invention with the technical essence and the achieved 20 result is a device for testing samples for heat resistance, containing means for securing samples, heating and cooling chambers with a drive

their relative displacement and instrumentation equipment. The heating and cooling chambers are made of two halves, each of which is hingedly mounted on the axle and provided with a pin that fits into the curvilinear groove of the base plate T.

The disadvantage of the known device is the complexity of its design.

The purpose of the invention is to simplify the design.

Claims (1)

This goal is achieved by the fact that in a device for testing specimens for heat resistance, containing means for fastening specimens, heating and cooling chambers with a drive of relative movement and test equipment, the cooling chamber is completed as a glass installed in the heating chamber along a sliding fit, open the end of which faces the means for fastening the samples and in the side wall of which the holes are screwed); But the number of which in the wall of the heating is made of Y-shaped channels, the distance between the outlets of each of which is greater than the distance from the blind end of the glass to its corresponding holes, which coincide with one of the outlets of each channel when the open end of the glass stops at the end of the heating chamber The drive of the cooling chamber is implemented in the form of a means for supplying a cooling medium under pressure communicated with the heating chamber on the side of the blind end of the glass. The drawing shows the proposed device. The device contains a heating chamber 1, closed with a chuck 2 with a foam 3 to exit the cooling medium, a rod 4 passing through a hole in the roof 2, mounted on the shank 4 means 5 for fastening samples, a cooling chamber made in the form of a cup 6 installed in the cylindrical part 7 of the heating chamber 1 along a sliding fit; The open end of the takan 6 faces the means 5 for fastening the samples. There are holes 8 in the side wall of the bowl 6, and V-shaped channels 9 are made in the walls of the cylindrical part 7 of the heating chamber 1, the number of which corresponds to the number of holes 8 in the side stand of the boiler 6. The movement of the cooling chamber is made as a means (in the drawing not shown) supplying a cooling medium under pressure, which communicates with the cylindrical part 7 of the heating chamber 1 through the pipeline with an electric valve 11. The temperature of the samples is controlled by a thermocouple 12, electrically connected to the device 13, which It also controls the electric valve 11, and the temperature in the heating chamber 1 is controlled by a thermocouple 14, electrically connected to the device 15. The heating is carried out from the power source 16, which is electrically connected to the device 15. The device works as follows. The test samples (not shown) are placed in the sample fixing device 5 and include the power supply 16 of the heating chamber 1. When the samples reach a predetermined temperature, the signal from the device 13 enters the electric valve 11, which opens the pipe 10, through which the medium is supplied to the cylindrical part 7 of the heating chamber 1. At the same time, the cup 6 rises up to form a screen protecting the samples from further heating. Raising up to the stop, the open end of the glass 6 presses on the tap 3 to exit the cooling medium and opens it, together with the internal cavity of the cup 6 with the atmosphere. In this case, the holes 8 in the side wall of the bowl 6 are aligned with the upper outlets 17 of the respective channels 9. Since the distance between the outlets 17 and 18 of each of the channel 9 is greater than the distance from the blind end of the bowl 6 to the corresponding openings of its holes 8, then in the extreme upper position The cup 6, the lower outlet 18 of each of the channels 9 does not overlap with the cup 6, and the cooling medium through the Y-shaped channels 9 enters the internal cavity of the cup 6, cools the samples and is removed through the valve 3 to the atmosphere. The coolant pressure is automatically maintained so that cTaKaif 6 is kept in its highest position. When Ofaztsov cooling to a predetermined temperature. The signal from the device 13 enters the electric valve 11, which closes the pipe 1O and connects the internal cavity of the cylindrical part 7 of the heating chamber 1 to the atmosphere. In this case, the glass 6 is lowered by the force of gravity. After that, 1 pc of heating / cooling is repeated. The proposed device allows for the testing of samples for heat resistance and has a simple design, since the drive for moving the cooling chamber is combined with the means for supplying the cooling medium. Apparatus for testing heat resistance of specimens, comprising means for fastening specimens, heating and cooling chambers with their relative movement and test equipment, characterized in that, in order to simplify the design, the cooling chambers are implemented as installed in the heating chamber along the slippers neck planting glass, the open end of which faces the means of attachment of the oats, and in the side wall of which holes are made, according to the number