SU489027A1 - Device for calibration of heat meters - Google Patents

Description

This is achieved due to the fact that in the device for the granulation of heat meters and the determination of the thermophysical characteristics of the structures, one of the temperature difference meters is made as installed between the center; and a side guard heater of a frame made of heat-conducting material with a winding, the coils of one of the halves of which are covered with a material forming thermocouples, the junctions of which are located on the inner surfaces of the BHeiUHeJr surfaces. framework.

The drawing is a schematic diagram of the device for the calibration of heat meters.

The proposed device contains a flat central electric heater 1. To prevent heat leaks from heater 1 down and sideways, the last is protected from below and from the sides by guard heaters 2 and 3, which must be supported in heater 1 in the radial direction and in the bottom plane zero temperature gradient. The security heaters 2 and 3 are turned on and off according to (1): (O (according to the signal from the measuring instruments of the temperature of 4 and 5). The measuring instrument for temperature 5 is located between the protection gel and heating gel 3 and C1. scrap 1, temperature difference meter 4 (made in the form located between the right 1 and side guard (m heater 2 frames G made of heat-conducting material with winding 7, coils of one - half of which are covered with thermocouple material at the end of the frame 6, junctions which are located on the inside and outside The surfaces of frame 6. For example, in the case of a circular central heater, frame 6 is filled in the form of a kopn or torus, the outer diameter and outer diameter of which are respectively equal to the outer diameter of central 1 and the inner diameter of guard 2 heaters, and the temperature difference meter 4 is in the form solenoid.

Thus, the measurement of the differential. the temperature in frame b in the radial direction is carried out using a technologically advanced sg and a sensitive measuring instrument for the differential flow with a very large number of junctions (equal to the number of turns of the winding 7). An increase in the number of thermocouples leads to an increase in the sensitivity of the temperature difference meter 4, and, consequently, to a decrease in the error of the device.

On the other hand, the frame between heaters 1 and 2 plays the role of a damper that muffles the heat waves arriving at the central heater 1 from the side of the security heater 2, which also reduces the error of the device.

The proposed device work em, ate eduyuschim.

A heat meter or a test design will interfere with the open surface of the central and side security 2 heaters. Registration of measured vedichin is performed in a stationary thermal mode. The heat generated by the central heater 1 is determined by the power it consumes.

In the calibration of heat meters, the relationship between the heat flux density b, emitted by the central heater 1 and the signal corresponding to this by-current generated in the heat meter is plotted.

When determining the thermal resistances and the design, they additionally measure (for example, using thermocouples) temperatures Db between its surfaces and the calculations are made according to the well-known formula

Subject invention

A device for calibration of heat meters, containing central and-guard heaters and temperature meters, located between the central and security heaters, is different in that, from the increase in calibration accuracy, the temperature difference meter is made in the form of a differential thermopile, which turns evenly are wound on a graduated table made of high thermally conductive material.

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