SU1667278A1 - Cooling device for electric and radio components - Google Patents

Abstract

The invention relates to electronic and radio electronics, in particular to devices for cooling electrical radio elements, is intended to provide normal thermal modes of operation of elements subjected to short-term thermal overloads. The purpose of the invention — extending operational capabilities — is achieved by increasing the range of operating temperatures. The device contains two circuits: external - passive and internal - active. The passive circuit provides heat removal from the electrical radio element due to conduction, convection and radiation when the electrical radio element is operating in nominal mode. The active circuit is connected with a thermostatic element in case the passive circuit does not ensure the normal thermal condition of the electrical radio element. The design of the active circuit allows additional heat removal due to the capillary effect, the Peltier effect, and heat absorption during the endothermic reaction. For this, the sealed enclosure of the active circuit is made of compartments, the walls of which are made of dissimilar metals with different thermoelectric power values. and heat absorption, creating a normal thermal mode of operation of electrical elements with multiple thermal cycles. 1 hp f-ly, 1 ill.

Description

The invention relates to radio engineering, is intended to provide thermal conditions for radio elements, thermoelements, radioelectronic devices operating with short-term thermal overloads, and can be used in other areas that require thermal regime during cyclic thermal overloads.

The purpose of the invention is to enhance operational capabilities by increasing the range of operating temperatures.

The drawing shows the structure of a device for cooling radio electronic elements.

A device for cooling a heat-generating electro-radioelectric element 1 comprises a passive external cooling circuit in the form of an external casing 2 made of heat-conducting

material, thermostatic element 3, active circuit, made in the form of a sealed enclosure of two compartments 4 and 5, which are made of metals with different values of thermoelectromotive force and are in contact with each other at the place of spa 6, compartment 4 - heat absorbing - is filled with active heat absorbing substance 7 , is separated from the heat-absorbing compartment 5 by a partition 8 of gas-permeable and non-heat-conducting material, the compartment 5 is filled with the active substance 9. The heat absorption coefficients of substances 7 and 9 differ from each other. The metal of the walls of compartment 4 has a greater thermo-emf value than the metal of the walls of compartment 5. The thermoregulatory element 3 is placed between the case 2 of the external passive cooling circuit and the compartment 4 of the sealed body of the active circuit with ensuring thermal contact with them. The installation platform 10 for the placement of the radio-electronic elements 1 is located on the outer casing 2 on the placement side of the thermostatic element 3 with ensuring thermal contact with them, respectively. Moreover, the thermostatic element 3 is located on the side of the base 11 of the hermetic housing of the compartment 4.

When conducting experimental studies, the active contour case was made using a pair of dissimilar Zn-Cu metals, the casing 2 of the passive contour was made of Ai, and the thermostatic element 3 was made of a nickel-nickel alloy.

A membrane of a non-heat-conducting and gas-permeable material, such as a zeolite plate, is used as a partition 8. The thermally loaded electrical radio element 1 is a thermopile (TE-MO-3).

The decisive characteristic when choosing materials for compartment walls 4, 5 of the hermetic body of an active kongur is the efficiency of their thermoelectric coefficient, at which the temperature and contact potential difference arising at the place of spa 6 should facilitate intensive movement of the active heat-absorbing substance from the heat-absorbing compartment 4 to the heat absorber - a storage compartment 5 with corresponding cooling processes, i.e. The thermopower of the metal body of the heat-receiving compartment 4 must be higher than the thermopower of the metal of the body of the heat-absorbing compartment 5.

The device works as follows.

When the radio electronic elements 1 are turned on, the heat they dissipate is removed

an external cooling passive circuit into the environment due to thermal conductivity, convection and radiation until the temperature of the electrical radio element 1 approaches the permissible condition of operation. When the temperature of the electrical radio element 1 is close to the preset permissible level, the thermostatic element 3, which controls the thermal resistance value, connects to the heat removal the internal active circuit. The difference in thermoEMF of compartment 4 and 5 metals, namely, the heat-receiving compartment 4 and the heat-absorbing compartment 5 of the active circuit, leads to a difference in their temperatures and contact potential difference in the spa 6, causing the transfer of the active heat-absorbing substance 7 from the heat-absorbing compartment 4 through the partition 8 to the heat-absorbing compartment 5 filled with active heat-absorbing substance 9. During the movement of the active substance 7 from compartment 4 through partition 8 into compartment 5, the temperature in compartment 4 decreases through the implementation of the capillary effect (Peltve effect) using electrically conductive active substances, and in compartment 5 heat is absorbed during the endothermic reaction when the active substances 7 and 9 are combined. As soon as the temperature of the electric radio element decreases to an acceptable level, the active circuit is turned off, heat is removed by an external cooling passive circuit. When temperature overloads occur, the process is repeated. The rate of heat removal, the time of operation of the active circuit are determined by the type of active substances 7, 9 and the working volumes of the heat receiving and heat absorbing compartments 4, 5, respectively.

When conducting experimental studies in compartment 5, the mixture of MNZYOzS20, accompanied by heat absorption, was provided.

In the prototype, where the body is made of a homogeneous metal, the only way to ensure the endothermic reaction is the temperature effect that spreads over the entire cooling volume, and heating the active substances to critical temperatures leads to a change in their physical and chemical properties, limiting the service life of the device two orders of magnitude compared to the proposed.

The invention eliminates the temperature effects on the entire cooling volume,

which ensures the stability of the properties of active substances during multiple temperature cycles, increases the service life of the device. An additional passive circuit in contact with the active circuit through the thermostatic element eliminates unproductive consumption of active substances in cases when the normal thermal operation mode of the radio radio element is provided by the operation of the passive cooling circuit.

Claims (2)

Thus, the proposed device has a long service life due to the realized possibility of controlling the consumption of active substances and controlling the heat exchange intensity of temperature and contact potential differences, eliminating unproductive consumption of active substances by turning off the active circuit, preserving the stability of the properties of active substances. Claim 1. Device for cooling of radio-radioelements, containing a hermetic body with bases made of two hermetically interconnected at a common parallel base of the body of a partition of gas-permeable and non-heat-conducting material compartments that are filled with active heat absorbing materials with different heat absorption coefficient, walls which are made of heat-conducting materials, and the installation site for the placement of radio electronic elements, about t-l and that with to expand the operational capabilities by increasing the temperature range, it is provided with an outer casing of thermally conductive material and a thermo-regulating element, and metals with different values of their thermoelectromotive force, respectively, are used as thermally conductive materials of the remaining walls of the housing sections A thermostatic element is placed between the outer casing and the compartment of the hermetic case, the rest of which is made They are made of metal with a high value of thermoelectromotive force, with thermal contact between them, respectively, and the installation platform for placing radio-electronic elements is located in the outer casing at the location of the thermostatic element with thermal contact. 2. The device according to claim 1, wherein the thermostatic element is located on the base side of the sealed enclosure of its corresponding compartment. V v v v v v v v v vv V v v v v v v vv v v v v oh oh oh oh oh oh oo oh oh five