RU1793569C - Heat insulating housing - Google Patents

Abstract

Usage: the invention relates to the field of radio engineering. SUMMARY OF THE INVENTION: An improvement in the conditions for regulating thermal conductivity is achieved by the fact that an additional Peltier thermocouple 7 with electrical leads 6, identical to the first one, is introduced into the thermal insulation casing, consisting of two sealed evacuated shells 1,2, separated by a main Peltier thermocouple above him. 1 ill. ---. : Ј.

Description

/ I XX yX / VVS

.uh-chdo: ixjt. uffESoa

tdlsh1:

Th

ft

 g

s

Yu

It can be seen from the dependence that when the temperatures are equal, there is no temperature contrast and no heat is released.

In the proposed device, the amount of heat (Q) transferred from the surface of the 4-Tag thermocouple to the surface of the thermocouple 7 TI r is proportional to the difference

Q Tar-Tir,

moreover, the polarity of the elements is chosen so that Tag-Ti g; those. in the evacuated cavity 3, between the adjacent surfaces of thermocouples 4 and 7, a temperature contrast is always created, determined by the difference T2r-Tin

The efficiency of regulation of thermal conductivity (K) is determined by the ratio

., Q T21 -Tir

To Of T2G-T1

It can be seen from the relation that, in the case when, a very high efficiency K is obtained and the system will work to transfer heat in the outward direction, determined by the polarity of the inclusion of Peltier thermocouples.

Thus, the advantages of the proposed device in comparison with the prototype.

The advantages of the proposed device are as follows:

- the efficiency of controlling the thermal conductivity has increased by a factor of K by creating a directed outflow and heat influx between adjacent surfaces of the thermocouples;

- the temperature range in which thermostating can be carried out has expanded;

- The system has become more dynamic with the thermal regulation process.

Thus, the objective of the alleged invention was achieved by constructing an original, effective design of the insulating casing by introducing a second gas generator on the Peltier element mounted on the inner side of the outer shell and located above the first thermocouple and, in addition, improving the thermal insulation properties of the inner shell which does not have a hole for the insulating plug. The proposed device allows K times

 Q

shch

where k

T2G - T1G T2r-Ti)

increase the efficiency of regulation of thermal conductivity.

Formula of the invention

Claims (3)

1. A heat-insulating casing containing internal and external sealed evacuated shells separated from each other by perimeters of a vacuum cavity, an adjustable heat carrier gas generator with electrical leads, made in the form of a Peltier thermocouple, which is placed in the vacuum cavity, between the outer and inner shells with the possibility thermal contact of one of its layers with an internal sealed evacuated shell, and a getter located in the specified vacuum cavity vozmr LS awn thermal contact with another layer of the gas generator Peltier element controlled heat medium, characterized in that, in order to increase reliability and operational capabilities of expansion by controlling the conditions for improving the thermal conductivity, it is provided with an additional controlled heating medium gas generator which is configured identically to main an adjustable heat carrier gas generator, which is placed in the indicated evacuated cavity between the inner and outer tight vacuum tubes to heat contact one layer with the outer one of these shells and the other layer with a getter of an additional controlled coolant gas generator, with the main and Peltier elements additional controlled heat carrier gas generators are connected, respectively, to the inner and outer shells and to their getter with their unlike spas, respectively. 2. The casing according to claim 1, with the exception that it is equipped with heat-insulating holders that are installed between said shells. From the above distinguishing features it is seen that the proposed device differs from the prototype in that there is no heat-insulating plug in the inner shell and there is a second Peltier thermocouple. which eliminates the disadvantage of the prototype and improves the efficiency of regulation of thermal conductivity. The applicant did not find technical solutions having similar features with features distinguishing the claimed solution from the prototype, and therefore, the proposed technical solution has significant differences. In FIG. Figure 1 shows the construction of a heat insulating casing. The heat-insulating casing (Fig. 1) contains inner 1 and outer 2 sealed shells separated by a vacuum cavity 3, in which the first 4 adjustable Peltier heat carrier gas generator with a getter 5 and electrical leads 6 and the second 7 adjustable gas generator are placed Peltier-based heat transfer fluid with getter 8 and electrical leads 9. as well as insulating holders 10. The heat-insulating casing (Fig. 1) is structurally an internal sealed evacuated shell 1, which is located in the outer sealed shell 2, the shells are separated by a vacuum cavity 3. The inner air-tight shell 1 is held in the outer air-tight shell 2 by means of heat-insulating holders 10. In the evacuated cavity 3, the first 4 and second 7 adjustable gas generators of the heat carrier based on the Peltier thermocouple are placed. The first thermocouple 4. contains two spas, one of which is in thermal contact with the internal sealed shell 1, and the other with the getter 5, and electrical leads 6. The second thermocouple 7 also contains two spas, one of which is in thermal contact with the getter 8, and the other with the inner side of the outer sealed sheath 2, and the electrical terminals 9. The thermocouples 4 and 7 are connected in such a way that they have the opposite polarity of adjacent junctions and are one above the other. Thermal insulation casing (see Fig. 1) works as follows. After switching on, by passing a direct current through a Peltier thermocouple 4, the junction in thermal contact with the inner shell 1 is cooled, and the second junction in thermal contact with the getter 5 starts to release heat carrier gas that transfers heat to the second Peltier thermocouple 7, This element has an external cold junction and the other is a warm junction brought into good thermal contact with the outer shell 2. The amount of heat transferred from the heated surface of the Peltier thermocouple 4 to the cold surface of the Peltier thermocouple is determined by the expression , 2x102xPxS (T2-Ti), where P is the gas pressure, mm Hg; S is the surface area of the Peltier element; Ta, Ti is the temperature of the surfaces of opposite junctions. Since the external Peltier element 7 is all as the time cools, the maintained temperature difference () of the surfaces contributes to a guaranteed, efficient transfer of heat from the inner shell 1 to the outer 2, i.e. such a device works as an efficient heat pump, which removes heat from one surface to another. This allows you to effectively control the temperature control of the object located in the internal cavity formed inner shell 1 in a wide temperature range. The same device also works efficiently when switching the polarity of Peltier thermocouples 4 and 7, thereby supporting a higher temperature of the inner shell 1. The heat carrier gas can not be introduced into the evacuated cavity 3, then the device will work like a normal thermostat, and the getter will absorb from the vacuum cavity 3 the residual gases that remained in it after evacuation or flowed due to diffusion over time. In this case, the durability increases and casing reliability as well its thermal insulation properties are improved, . Let us evaluate the efficiency of regulating the thermal conductivity of the prototype and the proposed device. The amount of heat transferred from the prototype (Qnp.) From the surface of thermocouple 4 (to a temperature T2g) to the surface of the outer shell 2 пропорцион is proportional to Qnp T2G - Ti