SU1244446A1 - Refrigerating unit - Google Patents

Description

The invention relates to refrigeration engineering, in particular, to devices equipped with an automatic defrosting system for evaporators with hot vapor of a refrigerant.

The purpose of the invention is to increase the reliability of the refrigeration unit.

FIG. 1 schematically shows a refrigeration unit; in fig. 2 is a section A-A in FIG. one.

The refrigeration unit contains a compressor 1, a condenser 2, an ispa (.rit1el 3, a thermo-regulating valve 4, a solenoid valve 5 and a heat exchanger made in the form of a heat pipe, the evaporation zones 6 and 7 of which are located on the suction and discharge lines of compressor 1, respectively. The heat pipe has a housing 8 with internal longitudinal ribs 9 and a cylindrical insert 10 mounted concentrically in the housing 8, on the outer surface of which longitudinal ribs 11 are made, which are placed in the slots between the ribs 9 of the building Sa 8 with the formation of slotted channels 12 between them. In the lower and upper parts of the insert 10 along the perimeter there are holes 13 and 14 respectively.

Refrigeration unit operates as follows.

The refrigerant vapor is compressed in the compressor 1 and enters the condenser 2 through the discharge line. During its movement, the refrigerant vapor transfers part of the heat to the intermediate heat carrier located in the evaporation zone 7 of the heat pipe, and their temperature decreases. The heat carrier boils, and under the action of mass forces its vapors rise to the condensation zone 6 of the heat pipe.

In condenser 2, vapor condenses, and the liquefied refrigerant through thermostatic valve 4, in which the refrigerant temperature is lowered through throttling, enters evaporator 3. The refrigerant vapor from the evaporator 3 is washed by the condensation zone 5 of the heat pipe and overheated

c due to the heat of condensation released during the condensation of vapors of the intermediate heat transfer medium inside the heat pipe.

When heat is supplied to the evaporation zone 7 of the heat pipe, the intermediate heat carrier in the annular slotted channels 12 intensively boils. The generated steam under the action of mass forces enters through the channels 12 into the heat pipe condensation zone 6, where it condenses on the cold inner surface of the heat pipe body 8 . The condensate through the holes 14 flows into the inner space of the insert 10 and flows down, then through the lower hole 13 enters the annular slotted channels 12. The insert 10 separates the flow of steam and liquid, thereby ensuring stable operation of the heat pipe.

During operation of the refrigeration unit in the cooling mode, the solenoid valve 5 is closed. In the defrosting mode, the refrigerant vapor from the compressor, washing the evaporation zone 7 of the heat pipe, is directed through the solenoid valve 5 (with the appropriate signal) to the evaporator 3. At the beginning of the defrost cycle, the hot refrigerant vapor entering the evaporator 3 is not only cooled, but condenses. , giving away the heat of condensation to the evaporator. The evaporation of the liquid refrigerant condensed in the evaporator 3 occurs due to the heat of condensation of the intermediate heat carrier of the heat pipe. This prevents the operation of the compressor 1 in the wet running mode, which increases the reliability of the refrigeration unit.

The proposed refrigeration unit with a heat exchanger in the form of a heat pipe provides a constant circulation of the intermediate heat transfer medium, as well as a high intensity of heat exchange during the boiling of the intermediate heat transfer fluid in the annular slotted channel, whose width is comparable to the detachable diameter of steam bubbles, and, consequently, increases the reliability of the refrigeration unit.

72

Compiled by E. Pirogov

Editor E. KopchaTehred I. VeresKorrektor M. Sharoshi

Order 3902/41 Circulation 482Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch POP "Patent, Uzhgorod, st. Project, 4

Claims (1)

REFRIGERATING INSTALLATION, comprising a compressor, a condenser, an evaporator, a thermostatic valve, a solenoid valve and a heat exchanger, characterized in that, in order to increase the reliability of operation, the heat exchanger is made in the form of a heat pipe, the condensation and evaporation zones of which are located respectively on the suction and discharge lines compressor, while the heat pipe has a housing with internal longitudinal ribs along the entire height and a cylindrical insert concentrically installed in it, on the outer surface of which you olneny longitudinal ribs arranged in the grooves between the ribs the housing to form a gap therebetween channels, wherein the insert into upper and lower parts of the perimeter provided with holes for communication with the inner cavity insert slotted channels. FIG. 1 SU, „, 1244446