SU1331511A1 - Cryogenic heat protection life support system - Google Patents

Abstract

This invention relates to autonomous human vital systems. In order to avoid frostbite of the heat exchanger, the system consists of a thermally insulated vessel I, inside of which are placed capillary-porous fluid separators 2, an evaporator 3 with tubes 4, a temperature-controlled valve 5, an ejector 6, a heat exchanger 7 with tubes 8, a sump 9 and an insulating suit 10. 2 3.p. f-ly, 1 ill. -iG (L with 00 SP

Description

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The invention relates to autonomous systems of human vitality in the performance of work in an environment unsuitable for respiration, with high temperature.

The purpose of the invention is to increase the reliability of the system by eliminating the freezing of the heat exchanger.

The drawing shows a scheme of a cryogenic heat-shielding life support system.

The system consists of a heat-insulated vessel 1, inside of which are placed capillary-porous liquid separators 2, an evaporator 3 with evaporator tubes 4, a thermostatically controlled valve 5, an ejector 6, a heat exchanger 7 with heat exchanger tubes 8, a sump 9 and an insulating suit 10.

The system works as follows.

After filling the thermally insulated vessel I, the working pressure in it is established using a special pressure stabilization system (not shown). During the operation of the system, the liquid respiratory mixture from vessel 1 through the liquid outlets 2 enters the annular space of the evaporator 3, where it boils and is heated, extracting heat from the respiratory mixture circulating in the evaporator tubes A. Thereafter, the respiratory mixture successively passes through all the tubes 8 of the heat exchanger and the evaporator tube. Coming out of the last tube of the heat exchanger, the breathing mixture passes through the thermo-regulating valve to the ejector nozzle 6, where it expands, sucking the breathing mix from the suitcase space of the insulating suit 10 suctioned by moisture and carbon dioxide. At this time moisture is removed from the respiratory mixture due to condensation on the cold tubes of the heat exchanger. The resulting condensate flows into the sump 9. After this, the cooled and dried breathing mixture returns to the sub-suit space. When the system is operating, excess breathing mix is discharged from the subsurface into the environment through a pickling valve (not shown). This ensures that the concentration of carbon dioxide is maintained within acceptable limits, as well as

giving overpressure in the suitcase space, which prevents the system from penetration of harmful substances from the outside.

The thermo-regulating thermo-bulb is located in front of the thermo-controlled valve, which ensures the regulation of the system's cooling capacity depending on the severity of the work performed.

To prevent the heat exchanger tubes from freezing, it is necessary that the wall temperature of the tube be greater than or equal. Taking into account this, we take the temperature of the breathing mix at the entrance to the tubes of the heat exchanger equal to 0 ° С. The temperature at the outlet of the tubes of the heat exchanger will be taken equal. Obviously, in this case, the temperature at the inlet of the evaporator tubes is equal, and at the outlet it is 0 ° C. Let us take the temperature of the respiratory mixture leaving the evaporator from the annulus equal to O C. Then the heat balance of the evaporator is written as:

G (i, -in) n,),

where G is the consumption of the respiratory mixture;

i is the enthalpy of the liquid breathing mixture at the inlet in the annular space of the evaporator; ip is the enthalpy at the exit from the intertube space; Chx Nx enthalpy, respectively, at the exit and entrance to the evaporator tubes. From here

Lj-ln

n t -t-ftui; -

20.

Therefore, to ensure the normal operation of the heat exchanger (without frosting), the number of entries must be greater than or equal to 20.

Elimination of frostbite of the heat exchanger allows to create a life support system that reliably ensures the normal viability of a person in any operating conditions.

Claims (2)

1. A cryogenic heat protection life support system containing an insulating suit, a thermally insulated vessel, an ejector, a thermostatic expansion valve with a thermobalon and a heat exchanger, so as to ensure reliable operation of the I33 Because of the fact that the heat exchanger is frozen, it is equipped with a multi-pass evaporator installed between the heat-insulated vessel and the heat exchanger, the heat exchanger is also multi-pass, with the evaporator annulus connected to one of the heat exchanger tubes and the remaining evaporator tubes are connected in series through the heat exchanger tubes. Editor I. Tupitsa Compiled by L.Gohshtein Tehred M.Dndyk 3750 / i Circulation 429 Subscription VNIIPI USSR State Committee on affairs of inventions and discovery 113035, Moscow, Zh-35, Raushsk nab. 4/5 The arbitrariness of the foam-printing company, Uzhgorod, st. Project, 4 I 2. The system of claim 1, characterized in that in the heat-insulated vessel Jca-pill are placed, p-but-porous liquid drains, by means of which the heat-insulated vessel is connected to the evaporator. 3, the system of claim 2, wherein the thermo-expansion valve of the thermostatic valve is installed before the thermostatic expansion valve. Proofreader A.Zimokosov