Tehnology and principle of operation of the refrigerator
The refrigeration unit operates as follows. The air compressor motor pumps out a pair of refrigerant from the evaporator and pumps them into the condenser. In the capacitor of the pair of freon cooled and condensed. Next RedKings holodilnik shema.jpg freon through the air dryer for air compressor and capillary pipe enters the evaporator. The hydraulic resistance of the capillary tubing is chosen in such a way as to create a certain difference between the suction pressure and the condensation that creates the compressor, through which the pipeline passed a certain amount of liquid. Each capillary corresponds to a specific compressor motor. At the entrance of freon in the evaporator, the pressure drops from condensing pressure to evaporating pressure. This process is called throttling. When this occurs, the boiling of freon, entering into the channels of the evaporator freon boils, the energy required to boil in the form of heat, is taken from the surface of the evaporator, the cooling air in the refrigerator. After passing through the evaporator the liquid refrigerant is converted to steam which is pumped by the compressor. The amount of exhaust refrigerating machine of heat per unit of consumed electric energy is called the refrigeration coefficient of the refrigerator.
1 - condenser 2 - capillary tube, 3 - 5hp compressor motor 4 evaporator 5 - air compressor filter dryer, 6 - return tube
the Condenser - heat exchanger for removal of heat from condensing (turns into a liquid) vapor refrigerant to the environment. It was necessary to increase the vapor pressure in the compressor and the outlet from the nick of heat in the condenser. On refrigerators with natural cooling condenser in the form of a coil or shield mounted on the rear wall (outside or inside). Refrigerators larger sizes are usually equipped with capacitors having the form of radiators, they are installed near the compressor at the bottom. The fan provides them with normal cooling. The capacitor must have a good cool down – this guarantee normal operation of the refrigerator. Evaporator – heat exchanger to cool the product directly in the boiling liquid freon. Boiling in the evaporator at a low temperature and corresponding pressure occurs due to the heat away from the cooling medium.
Capillary tube – designed for throttling the front of the evaporator liquid refrigerant and reducing the pressure from condensing pressure to evaporating pressure, with a corresponding decrease in pressure. Represents a copper pipe length 1.5 – 3M with an inner diameter of 0.6 – 0.85 mm is provided between the condenser and the evaporator.
the air compressor dryer is installed at the entrance to the capillary tube to prevent it from clogging by solid particles to absorb moisture from the refrigerant and to prevent freezing on exit of the capillary tube. The housing of the filter cartridge consists of a brass tube length 105-140 mm and a diameter of 18..12 mm with elongated ends in holes which are soldered respectively to the pipe of the condenser and the capillary. In the case of a filter placed between zeolite molecular grids installed on the inlet and outlet of the cartridge.
Doxypal - represents the capacity installed between the evaporator and the suction inlet of the compressor. Designed for dokimasia liquid freon and prevent it in the compressor, which can lead to failure of the compressor. Place doxypal in the cooled volume — in the freezing chamber or the refrigerating chamber. Decimater may be aluminum or copper.
Work household refrigerator provides the electrical circuit.
1 - controller 2 - push button defrost, 3 - thermal overload relay, 3.1. the relay contacts, 3.2. - bimetallic plate, 4 - motor motor-compressor 4.1. - the working winding, 4.2. - starting winding, a 5 - start relay, 5.1. the relay contacts, 5.2. the relay coil.
When the supply voltage in the circuit of an electric current passes through the closed contacts of the thermostat 1, the digging forced defrost 2, thermal overload relay 3, (3.1 contact, a bimetallic plate 3.2), start relay 5 (reel 5.2, contacts 5.1 open) and a working winding 4.1 motor motor-compressor 4. Because the motor is not rotating, the current flowing through its operating winding is several times larger than nominal. Start relay 5 is arranged so that when exceeding the rated current value close contacts 5.1 connecting to the circuit of the starting winding of the motor, which starts to rotate, as a result, the current in the operating winding is reduced, the start relay contacts open, but the engine continues to operate in normal mode at the expense of the working winding. When the set temperature is reached, the contacts of thermostat will open and the motor compressor stops. To turn off the motor when a dangerous increase in current is thermal overload relay. On the one hand it protects the motor from overheating and breakage, and on the other by fire. The relay consists of a bimetallic plate 3.2., which is dangerous when the increasing current heats up and forward, opens the contacts 3.1. After cooling, the bimetallic plate contacts again.