SU1643890A1 - Compression refrigerator - Google Patents

Description

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(21) 3981788 / 23-06 (22) 11/04/85 (46) 04/23/91. Bul Ms 15

(71) Moscow Technological Institute of the Ministry of Consumer Services of the Population of the RSFSR and All-Union Research Experimental Design Institute of Household Machines and Instruments

(72) A. I. Naberezhnykh, Yu. A. Ponomarev, O. N. Pluzhnikov, N. F. Ivchenko, L. V. Sumzina, and V. F. Vozny (53) 621.57 (088.8)

(56) Japan Patent Nfe 55-5019, cl. F 25 D 11/02, 1980.

(54) COMPRESSION REFRIGERANT UNIT

(57) Invention m. B. used in units with a dual evaporative cooling system and various t-boil refrigerant boilers in evaporators. The purpose of the invention is to increase the economy and reduce the time of natural thawing and the first evaporator during the non-working part of the cycle. For this purpose, the inlet and outlet valve 4 is provided with vertical containers 5 and 6. A capillary tube 8 is located inside the evaporator 9. The outlet end of the tube 8 is connected to the inlet of the evaporator 10. The helical tube 7 is connected to the input end 6 with the reservoir 6 and the output end to the inlet evaporator 9. With a container 5, the outlet end of the capillary tube 3 and the inlet end of the tube 8 are connected. Coolant from this evaporator. 1 il.

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about

The invention relates to refrigeration engineering, namely, to compression refrigeration units with a two-evaporative cooling system and different boiling points of refrigerant in evaporators.

The aim of the invention is to increase the economy and provide automatic natural defrosting of the evaporator of the refrigeration compartment during the off-cycle time.

The drawing shows a compression refrigeration unit

The refrigeration compression unit contains series-connected compressor 1, condenser 2, first capillary tube 3, valve 4 with two vertical tanks 5 and 6 at the inlet of the outlet, two parallel-mounted capillary tubes 7 and 8, high-temperature evaporator 9, low-temperature evaporator 10, as well as regenerative heat exchangers 11 and 12. Moreover, part of the capillary tube 8 is located inside the evaporator 9 and the output end of which is connected to the inlet of the evaporator 10, and the capillary tube 7 is connected to the input end with tank b and outlet - with the inlet of the evaporator 9. In this case, with the tank 5, the output end of the capillary tube 3 and the input end of the capillary tube are connected. 8 so that the end of the tube, 3 is located below the inlet end of the tube 8,

The unit works as follows. After loading the heated products of the freezing and refrigerating chambers, the unit is turned on for 24 hours continuous operation without turning off the compressor, i.e., the freezing mode. So, when starting up the unit, the temperature in the refrigerating chamber is above + 5 ° C, then, at the command of the first thermostat installed in the refrigerating chamber, valve 4 turns on. The refrigerant vapor compressed in compressor 1 and concentrated in the condenser 2 is throttled by the first capillary tube 3 in the upper vertical tank 5 to intermediate pressure. The magnitude of the intermediate pressure is determined by the permeability of the capillary tube 3 and is chosen so that the valve 4 and the associated vertical containers 5 and 6 do not freeze and no condensate will fall on them. After throttling in the first capillary tube 3, a liquid refrigerant flows into the lower vertical tank 6, covers the lead-in end of the second capillary tube 7 and is throttled therein from intermediate pressure to suction pressure, ensuring that the high-temperature cold is produced.

evaporator 9. Increasing the boiling point of refrigerant in the plus evaporator leads to a significant increase in the cooling capacity of the compressor.

At the same time, refrigerant vapor formed during throttling to intermediate pressure is supplied through the third capillary tube 8 to the inlet of evaporator 10. Throttled refrigerant vapor ejects a vapor-e liquid mixture formed after incomplete boiling of the refrigerant in the second evaporator 9 into the first evaporator 10. In the evaporator 10, the vapor-liquid mixture boils, strongly bent the heat from the cooled products, and the resulting vapors of the suction compressor 1.

When the temperature in the refrigerating chamber decreases, the valve 4 closes. When this liquid refrigerant fills the top

0 a vertical tank 5 and covers the input end of the third capillary tube 8, which nests throttling liquid refrigerant at the inlet of the evaporator 10. After closing valve 4 in the second evaporator 9, the vapor-liquid mixture remains, which is intensively sucked out by using the kinetic energy of the jet throttled in the first evaporator liquid mixture. As a result,

The zero flap 4 provides a quick defrosting of the positive evaporator 9. The refrigerant vapor formed during boiling in the first evaporator 10 is sucked off by the compressor at a pressure ensuring a low-temperature level. After freezing the products in the low-temperature compartment, the refrigerator switches to the food storage mode.

0After reaching the required temperature in the low-temperature compartment, the compressor is switched off during the time of the non-working part

5 cycle automatic high-temperature evaporator automatic defrosting occurs. Full thawing occurs as a result of the ejection of the vapor-liquid mixture from the positive evaporator, which allows suction of the refrigerant from this evaporator, which ensures its quick defrosting,

When the temperature rises in the low-temperature compartment, the second thermostat is triggered, the compressor is turned on and the refrigerator is cycled,

Claims (1)

Claims: Compression refrigeration unit comprising a refrigerant circuit with a series-connected compressor, a condenser, a first capillary tube, a switching valve, a second capillary tube and two evaporators, and a third capillary tube connecting the outlet of the first capillary tube to the inlet of the second evaporator, I differ from the fact that, in order to increase the economy and reduce the time defrosting of the first evaporator during the non-working part of the cycle, the valve at the inlet and outlet is provided with vertical tanks, the upper end of which contains the outlet end of the first capillary tube and the inlet - the third, the first of which is located under the second, and at least part The third capillary tube is placed in the first evaporator.