SU898226A1 - Domestic thermoelectric refrigerator - Google Patents

Description

(54) HOUSEHOLD TER YUELECTRIC REFRIGERATOR

I

The invention relates to refrigeration equipment used to store food products.

 Household coolers are known for storing perishable products in a cooling state with, including an outer casing, a thermally insulated refrigerating chamber, a refrigeration unit with an evaporator or a semiconductor OBoff thermoelectric battery 11.

However, when turning on and gradually lowering the air temperature in the refrigerating chamber, a dew point occurs, i.e. the corresponding temperature at which the water vapor in the air becomes saturated. The excess moisture of the saturated vapor that accumulates on the heat-absorbing element immediately freezes, as a result of which the dynamic equilibrium between the condensate and the saturated vapor is disturbed (the latter becomes unsaturated), which leads to enhanced evaporation of the products stored in the chamber, i.e. to the deterioration of their presentation and taste. The snow cover formed on the heat-absorbing element, the thickness of which increases, sharply reduces the heat exchange with the air of the refrigerating chamber and, accordingly, the cooling capacity of the heat-absorbing element. All this leads to the fact that

As the thickness of the snow cover increases, the mode of operation of the refrigerator is disrupted and, with a greater expenditure of electricity, the average temperature of the refrigerating chamber rises. For

15 defrosting a heat-absorbing element has to be periodically unloaded and turned off the refrigerator, which causes inconvenience and negatively affects the storage of perishable goods.

20 products.

The closest in technical essence and the achieved result to the invention is a household thermoelectric refrigerator containing a two-piece case, a refrigerator located above it, an empty chamber, a radiator and a thermocouple with a cold junction, and a hot junction - with a vapor chamber. This refrigerator has high economic efficiency, ensures quiet operation and high efficiency of heat removal from the hot junctions of the semiconductor battery 2J. However, in this refrigerator, a snow cover forms adjacent to the cold seams of the aluminum radiator and requires periodic defrostation. In the refrigerating chamber, humidity in the spirit is gradually reduced, which leads to intensive evaporation of products. In addition, the temperature of the air in the cooling chamber also varies. The aim of the invention is to improve the storage conditions of products and the convenience of operation. The goal is achieved in those in a domestic thermoelectric cooler containing a double-walled case, a refrigerating chamber, an evaporation chamber located above it — a radiator and a semiconductor thermopile, whose cold junctions contact the radiator , and the hot junctions are with the evaporation chamber, the refrigeration chamber is placed in such a way that between it and the inner walls of the case there is a covering cavity, filled with distilled water, with the padio located in the latter. At the same time, one of the side walls of the evaporation chamber is inclined, and inside the chamber there are mounted inclined heat exchange tubes for circulating ambient air. The drawing shows a domestic thermoelectric cooler, general V.ID, longitudinal section. The refrigerator contains a double-walled case 1, a refrigerating chamber 2 an insulating layer 3 placed above the refrigerating chamber 2, an evaporation chamber 4, a radiator 5 and a semiconductor battery 6, whose cold junctions contact the radiator and the hot junctions to the evaporation chamber 4. Between the refrigerating chamber 2 and the inner walls 7 of the core 4 of the start 1 is formed around its cavity 8, filled with distilled water, while the radiator 5 is located in the latter. In order to increase the evaporation surface of the coolant, the side wall 9 of the evaporation chamber 4 is made inclined, and inside the chamber 4 heat exchanger tubes 1 O are mounted, the end openings of which are free for the circulation of ambient air. In the upper part of the housing 1 there are ventilation slots 11 and 12. The refrigerator operates as follows. Pure water, unlike other liquids, has the highest density at 4 ° C. This feature of water is used in the principle of the proposed refrigerator. The layers of water cooled by radiator 5 to 4 ° C immediately descend through the left side of cavity 8 and occupy the lowest part of its volume, displacing upward through the right part of cavity 8 to radiator 5, layers of water with a temperature higher, i.e. with a lower density. Thus, continuous natural water circulation is formed around the refrigerating chamber 2, as a result of which, as well as its highest heat capacity and good thermal conductivity of the walls, the air of the refrigerating chamber is cooled to 4 ° C. The water vapor becomes saturated. Excess moisture condenses on the walls of the chamber. The heat exchange coefficient of air with the walls of the chamber due to this not only does not decrease, but increases, which also contributes to the high humidity of the air. Due to the high humidity of the air stored in the refrigerator, the products do not lose moisture and, accordingly, their presentation and taste. Instead of a conventional light bulb, an ultraviolet light bulb (not shown) is installed in the refrigerating chamber 2, the rays of which are bactericidal, thereby eliminating the appearance of mold on some products. The heat absorbed by the radiator 5 of the cold junctions of the thermopile 6 is released at the hot junctions of the latter and is transmitted through the base of the evaporation chamber 4.

Claims (2)

Claim 1. A household thermoelectric refrigerator containing a double-walled case, a refrigerating chamber, an evaporation chamber placed above it, a radiator and a semiconductor thermo-battery, the cold junctions of which are in contact with the radiator, and the hot junctions are in contact with the evaporating chamber, which is characterized in that for 5 purposes improving the storage conditions of products and ease of use, the refrigeration chamber is placed in such a way that a cavity is formed between it and the inner walls of the housing, filled with distilled water, while ATOP is in the latter. 2. The refrigerator according to claim 1, characterized in that one of the side walls of the evaporation chamber is made oblique, and inclined heat exchanger tubes are mounted inside the chamber for circulating ambient air. 20 Sources of information taken into account in the examination 1. Small refrigeration units and refrigeration transport. Directory. Ed. A.V. Bykova, M., Food Industry, 1978, p. 105-107. 2. Copyright certificate of the USSR No. 480890, cl. F 25 B 21/02, 1973 (prototype). VNIIIPI Order 11928/55 Circulation 541 Subscription Branch of PPP Patent, Uzhgorod, 4, Projectnaya st.