SU1500867A1 - Thermostat - Google Patents

Abstract

The invention relates to thermometry and allows improving the accuracy of calibration of large-size massive thermometers. The thermostat contains a preparatory chamber with heaters, a pump, a stirrer, an electronic control unit, a working chamber with a reference temperature sensor and a heat equalization screen, and a compensation chamber separated from the working chamber by a removable check valve that separates both chambers and serves as a heat insulator. 1 il.

Description

The invention relates to thermometry and is intended for the calibration of borehole or other large-sized thermal receivers.

The purpose of the invention is to improve the accuracy of calibration of large-sized massive thermometers.

The drawing shows schematically the proposed thermostat with the thermometer under test immersed in it.

The thermostat contains a preparatory chamber 1 fixed in the casing 2, a working chamber 3 and a compensating chamber 4 enclosed in the casing 5. The space between the preparatory chamber 1 and the casing 2, the working chamber 3, the compensating chamber 4 and the casing 5 is filled with thermal insulation material (Emiroid) 6. Preparatory chamber 1 and working chamber 3 are interconnected by pipeline 7, and compensation chamber 4 with preparatory chamber 1 by pipeline 8. Pipe 9 is designed to drain the thermostatic liquid 10 (distilled water), which pump 11 circulates around the device. Preparatory chamber 1 is equipped with heaters 12, a pump 11, a stirrer 13 and an electronic control unit 14. A working temperature gauge 15, a grate 16 for providing a uniform flow of thermostatic fluid 10 in the working chamber 3, a heat-leveling screen 17, a temperature gauge 18 of the thermometer under test 19, and retainers 20 determining a strictly defined position of the thermometer under test 19 plane. The compensation chamber 4, with its upper part through the heat insulator 21, is fastened to the upper part of the skin 5 and closed with a cover 22 with a rubber sealing strip 23. The upper split head of the thermometer under test 19 protrudes through the central hole 24 between the test thermometer.

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3 and the compensation chamber 4 is an annular shelf 25 on which, under pressure from the weight of the thermometer under test 19, a disk-shaped metal body 27 of the check valve rests against the sealing rubber ring 26. The metal case 27 of the check valve and the rubber ring 26 have four matching holes 28 for passing the thermostatic fluid 10 from the working chamber 3 into the compensation chamber and the central hole 29 for coaxially placing the thermometer under test 19 in the working chamber 3 and the compensation chamber A. On the upper plane of the metal case 27 of the check valve is an annular rubber shutter 30, which, when the pump 11 is turned off, closes the openings 28, preventing convective heat transfer between the working chamber 3 and the compensation Camera 4,

The thermostat works as follows,

The preparatory chamber 1 and the working chamber 3 are filled with thermostatic fluid 10. The thermometer under test 19 from the side of its temperature sensor 18 is passed into the central opening 29 of the removable non-return valve until three clamps 20 are engaged and then immersed in the compensation chamber 4 until the rubber sealing ring 26 ring-shaped shelf 25; Thermostat liquid 10 and compensation chamber 4 are added up to the level of pipeline 8 leaving it, and chamber 4 is closed with a cover 22. The electronic control unit 14 sets the required thermal operating mode of the preparatory chamber 1. Turn on the pump II, the stirrer 13 and the heaters 12. Excess thermostatic liquid 10

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pumped by pump 11 through line 7 into working chamber 3, from where, raising rubber shutter 30, through openings 28 enters compensation chamber 4 and returning to preparatory chamber 1 by means of pipe 8, the forced circulation circuit closes.

The calibration of the tested thermometers 19 is possible in two versions - dynamic or static.

In the dynamic version of the thermostat, the calibration is carried out under steady-state thermal conditions and the pump 11, the heaters 12 and the mixer 13 are turned on. In the static version of the thermostat, the pump 11, the heaters 12 and the mixer 13 are turned off,

In the static version, in the thermostat there is no forced circulation of the 1-thermostatic fluid 10, as a result of which the rubber valve 30 of the check valve tightly blocks the holes 28, hermetically isolating the working chamber 3 from the compensating 4.

Claims (1)

30 claims A thermostat containing a preparatory chamber with heaters, a pump, a stirrer, and an electronic control unit, as well as a working chamber with clamps and a heat-equalizing screen, characterized in that, in order to improve the accuracy of checking large-sized array thermometers, it is equipped with a compensation chamber connected to the preparatory chamber , and a check valve with a central bore and an annular rubber shutter located between the compensation and working chambers. П 19 gz: l fO