SU1740917A1 - Refrigerating plant - Google Patents

Abstract

Usage: refrigeration units with air cooler power supply system Refrigerant providing stable operation under varying thermal loads. SUMMARY OF THE INVENTION: The installation comprises a circulation circuit with a compressor 1, a condenser 2, a main thermostatic valve (TRV) 3 and an air cooler 4 in a heat-insulated chamber 5. Equalizing line 6 of the main TRV 3 is connected to the outlet of the cooler 4 at the installation site of the balloon 7. A jumper is installed between the steam cavity of the condenser 2 and the suction line of the compressor 1, containing successive capillary tubes 8, 9 and 10. In addition to the main dispenser 3, additional dispensers 11 and 12 are connected with t Thermoballoons 13 and 14 installed at the outlet of the air cooler 4. Equalizing lines 15 and 16 additional expansion valves are connected respectively to the outlets of the capillary tubes 8 and 9 1 or

Description

The invention relates to refrigeration, in particular, to installations with the formation of transients.

A refrigeration unit is known, which contains a circulation circuit with a compressor, a condenser with a thermostatic valve with an equalizing line and an air cooler, the thermal balloon being installed at the outlet of the air cooler.

A refrigeration unit is known that contains a closed circulation circuit with a compressor, a condenser, a main thermostatic valve with an equalization line and an air cooler, and additional thermostatic valves, the latter being connected in parallel, and their thermocylinders are installed in the circuit after the air cooler.

This refrigeration unit is the closest to the invention in its technical essence and the achieved result. The evaporator power supply system used in it with parallel installed thermostatic valves is difficult to adjust and is not capable of stable operation.

The purpose of the invention is to increase the sustainability of the work.

This is achieved by the fact that in a refrigeration unit containing a closed circulation circuit with a compressor, a condenser, at least one

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thermostatic valve with equalization line, air cooler and parallel installed additional thermostatic valves with thermal bulbs after the air cooler, additionally install a jumper connecting the steam cavity of the condenser with the compressor suction line through successive capillary tubes, and the number of tubes exceeds by one the number of additional thermoregulators , and the equalization lines of the latter are connected to the outputs of the corresponding capillary tubes. approx.

The drawing shows the proposed installation in ka.

The refrigeration unit contains a closed circulation circuit with compressor 1, condenser 2, main thermostatic valve (TRV) 3 and air cooler 4 in the heat-insulated chamber 5. Equalizing line 6 of the main thermostatic valve 3 is connected to the outlet of the air cooler 4. Between the steam cavity of the condenser 2 and the suction line of the compressor 1 are equipped with a jumper, containing successive capillary tubes 8, 9 and 10. In parallel with the main switchgear module 3, additional switchgear units 11 are connected 12. Their bulb 13 and 14 are mounted on the outlet of the air cooler 4. The equalizing line 15, expansion valve 11 podklyuchena.k exit capillary tube 8, and an equalizing line 16, expansion valve 12 - to the output of the capillary tube 9.

Refrigeration unit operates as follows.

When the hot heat-insulated chamber 5 is cooled, the compressor 1 sucks the vapors from the air cooler 4, compresses them and pumps them into the condenser 2. In the condenser 2, the vapors are liquefied. Liquid refrigerant enters parallel installed additional TPB 11 and 12 and main TPB

3. Here the vapors expand and boil to the air cooler.

4 where the refrigeration action takes place

on the construction elements of the chamber 5 and cooling objects in it. Due to the large flow capacity of the throttle assembly, a high refrigerating capacity of the refrigeration unit is ensured at a high boiling point. A minor part of the saturated vapor from the condenser 2 is throttled in the jumper into the suction line, which allows to maintain additional pressure-sensitive dispensers 11 and 12 in the sump

the linkage of their equalizing linms 15 and 16 with the joints of the capillary tubes 9 and 8

The displacement of the valve seat valve is determined by the difference between the vapor pressure in the thermostatic valve system (supramembrane region) and the vapor line in the equalization line (sub-membrane).

Since thermo-balloons 7, 13, 14 ТРВ 3, 11, 12 are installed on the same section of the pipeline, the pressure in the thermal systems of all ТРВ are equal. The pressures in the equalization lines x6. 15, 16 are determined in a jumper at the outlets of the capillary tubes 10, 9, 8, respectively. The maximum pressure difference in the expansion valve 3 is minimal in the expansion valve 11 due to the high vapor pressure in the equalization line 15.

In the process of cooling the heat-insulated chamber 5 by a refrigeration unit, the boiling point and the vapor temperature at the outlet of the air cooler decrease. The vapor pressure in the thermometers of the expansion valve 3, 11. 12 and equalization lines 6, 15, 16 also decreases. Because of the vapor pressure in the thermal control valves 11 and 12 decreases faster than pressure in equalizing lines x 15 and 16, there is a decrease in the pressure difference acting on the membranes of TPB 11 and 12, and the difference in the TPB 11 is less than that of TPB 12. Reduction of the pressure difference acting on the membranes at TRV, leads to locking TRV. The TPB 11 is locked first. The throughput of the throttle assembly is reduced, but the compressor capacity remains high. Therefore, the boiling pressure and boiling point are reduced. With a decrease in the temperature of cold generation, the cooling capacity decreases, remaining more than the cooling capacity of a similar refrigeration unit with one TPV. There is a further decrease in the temperature of the vapors at the outlet of the air cooler 4, the vapor pressure in the thermal system of the TPB 11, the pressure in the equalization line 16, as well as the difference between these pressures. The latter leads to locking of the VTR 12, the flow capacity of the throttle assembly, the boiling pressure and the boiling point decrease. Further cooling of the chamber is provided by the capacity of the main TRB 3,

Claims (1)

Claims of the Invention A refrigeration unit comprising a closed circulation circuit with a compressor, a condenser, at least one main thermostatic valve with an equalized line, an air cooler and additional thermostatic valves, the latter being connected in parallel, and their thermocylinders installed in the circuit after the air cooler, differing in that that, in order to increase stability in operation, the installation additionally contains a jumper connecting the steam cavity of the condenser with a compressor suction line through successive capillary tubes, the number of tubes per unit exceeds the number of additional thermoregulating valves, and the balancing lines of the latter are connected to the outputs of the corresponding capillary tubes MR; / 12