SU527411A1 - Multi-chamber thermostat - Google Patents

Description

one

The invention relates to the field of measurement technology and can be used for the calibration and calibration of thermocouples, as well as for the advanced thermostating during scientific research.

Multichamber metal thermostats are known, the temperature of the outer chamber of which are maintained at a certain level, and the temperature of the inner chamber is not controlled and is set initially with a special heating heater.

However, the accuracy of operation of such thermostats and the speed of access to the operating mode are insufficient. ;

The closest technical solution to this invention is a multi-chamber thermostat containing heat-insulated and installed one into another thermostatically controlled and thermostatically controlled C23 chambers.

This thermostat also has an inadequate speed of operation and a low accuracy in maintaining the temperature.

ry, since the use of more than two contours in them is difficult.

The purpose of the invention is to increase the speed and accuracy of thermostating, which is achieved by introducing a heat conductor that is installed in the walls of the thermostat chambers. The heat line set to be made in the form of a metal rod or liquid.

FIG. Figures 1 and 2 show multi-chamber thermostats with metal and liquid heat lines, respectively.

A multi-chamber thermostat consists of a thermostatically controlled chamber 1 (internal chamber), which is surrounded by passive thermo-leveling chambers 2, and an external temperature-controlled chamber 3. The chambers are thermally insulated one from the other by heat insulators 4 and the air between the chambers.

Claims (2)

The thermostat has external heat insulation. 5 It is installed between the chambers. the heat line 6, which is designed in such a way that the thermal resistance between it and each chamber, can vary. Chambers 1 and 2 have a high heat capacity. The heat pipe 6 can be made, for example, in the form of a metal rod rotating around its axis in a special slot (Fig. 1). The rod is a cylinder truncated from the sides, and the groove is made in the form of a cylindrical bore having extensions from the sides. In the initial state, the rod is positioned so that it has good thermal contact with all chambers / (solid line in Fig. Thermostatically controlled chamber 3 is brought to operating mode by means of an external thermostat or a thermostatting device placed in it. Thermostatically controlled temperature of the chamber to the resistance of the heat conductor is quickly transferred to the remaining chambers. After all the chambers reach the temperature mode, the thermal resistance between them increases smoothly or sharply, for example, by turning the rod -e Circumference of its axis at 90 In this case, an interlayer of air having a high thermal resistance arises between the rod and the walls of the chambers due to the large thermal capacity of the thermostatted and passive chambers and the large thermal resistance between them thermal disturbances of the external chamber (thermostat inaccuracy, instability, etc. .) are not transferred to the object being thermostatted. It is structurally easier to implement a thermostat with a liquid heat pipe 6 (Fig. 2). It has a higher maximum to a minimum of thermal resistance between the chambers, which allows to increase the accuracy of thermostating. The heat transfer fluid enters the thermostat from the outer cup 7 through the hose 8 to the openings 9 and 10. It fills the space between the circuits, providing thermal contact between them. After the thermostat reaches the thermal mode, the liquid is taken out of the inter-chamber space. At the same time between the cameras there is a large thermal resistance. In the proposed device, several passive thermal leveling circuits can be used, which allows to improve the temperature control accuracy and increase the level to 0.001 ° C and better by several orders of magnitude. In addition, the speed of the thermostat on the thermal mode is increased, the design and operation of the thermostat are simplified. Claim 1. Multi-chamber thermostat containing heat-insulated and installed one into another thermostatically controlled, passive and temperature-controlled chambers, characterized in that, in order to improve the speed and accuracy of thermostatting, it has a heat pipe that is installed in the walls of the thermostat chambers. 2. Thermostat according to claim 1, distinguishing from 10 to 10 and with the fact that the heat conductor is made in the form of a metal rod. 3. The thermostat according to claim 1, which is also distinguished by the fact that the heat conductor is made liquid. Sources of information taken into account in the examination: 1. Fogelson I. B. Thermostatic devices for precision temperature studies. / Works AFI No. 25, pp. 165, 197O 2. Veselova EP and others. Dual-circuit thermostat auth. swith 220571 Q05 23/30 1968 1