Device for automatic protection of cooling compressor against wet stroke

FIELD: cooling engineering.

SUBSTANCE: device comprises two temperature gauges, unit for comparing temperatures, unit for generating alarm signal on wet stroke, converters for converting signals from temperature gauges into the alternating signals, frequency synchronizer, amplifier, and protecting relay. The first temperature gauge is set in the line for supplying coolant to the object to be cooled. The second temperature gauge is set at the inlet of the line for withdrawing the vapors of coolant from the object to be cooled to the bridge of switching of the compressors. The converters are synchronized in frequency. The unit for comparing temperatures is made of a transformer with magnetization and two primary windings which are connected in series with the signal converters. The secondary winding is connected with the input of the amplifier whose output is provided with the protecting relay.

EFFECT: enhanced reliability.

1 dwg

 

The invention relates to refrigeration, and in particular to the cooling of the piston compressor from water hammer through automatic compressor protection from wet operation.

It is known that to protect the compressor from damp course and, respectively, of the hydraulic shock used in refrigeration installation separators liquid (coolant) and vertical circulation receivers (VCR) with protective relays level (CDD). Despite the use of coolant and VCR with CDD hydraulic shock remains a major and severe accident (see Uccellacci "analysis of the causes of breaks and leaks of ammonia from refrigeration plants. Refrigeration, 1984, No. 4, p.48-50). This is because the efficiency of separation of the vapor phase from the liquid in the coolant and VCR decreases significantly with increasing load on the refrigeration object (for example, when loading freezers for frozen goods).

The closest analogue of the claimed invention is the automatic regulator overheating of the refrigeration machine comprising two sensor temperatures and the comparison module temperature, while the first sensor is installed in the supply line of the liquid refrigerant in the cooled object, a second temperature sensor installed at the inlet of the suction line refrigerant vapor from the cooled object (see A.S. SU 237173, F 25 B, 1969).

The technical result is allaamah the invention, improving the reliability of automatic protection refrigeration compressor from wet operation and simplifying the design of this protection.

This result is achieved by the fact that in the inventive device introduced: transducers of signals from temperature sensors in the signal variable values, the clock frequency converters, transformer toroidal shape (TTF) with four windings, operational amplifier with protective relays.

The second temperature sensor is installed on the inlet line of the suction of the refrigerant vapor in the bridge switching compressors. Signal converters installed at the entrance TTF, and their output is made in the form of windings on TTF, which are connected in series with the transducers of signals and connected between a counter. This allows you to continuously compare the signals from the temperature sensors t0 and t that may change in time. To increase the sensitivity TTF and amplification of the signals TTF made of magnetically sensitive material (e.g. ferrite) and has a bias winding with direct current. The secondary winding TTF introduced at the input of the operational amplifier, the output of which is mounted protective relays.

The inventive device shown in the drawing.

The device consists of:

from the two temperature sensors 1 and 2, which are installed in the feed line of the refrigerant is cooled object 3 and the input line of the suction refrigerant in the bridge 4 switch compressor 5;

- of the two converters 6 and 7, which are included in the outputs of the temperature sensors, transducers 6 and 7 are connected to the synchronizer 8;

from the comparison module temperatures, which consists of a transformer 9, and the three windings 10, 11, 12, as well as from the bias winding 13;

from the amplifier 14 and the protective relay 15 module alarm signal 16.

This device operates as follows. The signals from the temperature sensors 1 and 2 arrive at their converters 6 and 7 with the synchronizer 8, where in the form of signals of variable values synchronously received respectively in the primary winding 10 and 11 of the transformer 9. Winding connected in opposite, the signals are subtracted, and the resulting signal is taken from the secondary winding 12 of the transformer 9. The resulting signal is fed to the input of amplifier 14, where it is amplified and compared with the setpoint, which is equal to Y=t-t0=10-15°C. If the resulting signal becomes smaller the rate, the amplifier includes a protective relay 15, which disables all running compressors with alarm sound and deciphering the light signal 16.

This device allows to increase the reliability of automatic compressor protection of wet operation and to simplify the design of this protection.

Device for the automatic protection of refrigeration compressor from wet Ho is a, includes two sensor temperatures and the comparison module temperature, the first temperature sensor installed in the supply line of the liquid refrigerant in the cooled object, and a second temperature sensor installed at the inlet of the suction line refrigerant vapor from the cooled object in bridge switching compressors, characterized in that the device further comprises a delivery module alarm on a wet course, the transducers of signals from temperature sensors in the signal variable value, clock frequency, power and protective relays, converters are synchronized in frequency, the comparison module temperature is made in the form of a transformer magnetization and two primary windings, which are connected in series with signal converters and connected between a counter and the secondary winding is connected to the input of the amplifier, the output of which is mounted protective relays.



 

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