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What is the refrigerator compressor used for

What is the refrigerator compressor used for What is the refrigerator compressor used for? 　　Refrigerators use evaporative cooling or vaporization to absorb heat to achieve the purpose of refrigeration. The throat of the refrigerator contains a refrigerant known as Freon, commonly known as refrigerant. A commonly used one is difluorodichloromethane, which is a colorless, odorless and non-toxic gas with a boiling point of 29°C. Freon is pressurized by the compressor when it is in a gas state. After being pressurized, it flows to the condenser at the back of the refrigerator through the throat pipe, and is radiated by the heat sink to condense into a liquid. 　　 After the liquid Freon enters the valve of the evaporator, it is immediately converted into steam due to the pressure away from the compressor. At the same time, the latent heat of vaporization is drawn from the air and food in the refrigerator, causing the refrigerator to cool. The vaporized Freon is pressed back to the condenser outside the box by the compressor to dissipate heat, and then turns into a liquid. In this way, the heat energy in the refrigerator is pumped out of the box. The refrigeration of the refrigerator must be completed by the work of the compressor. We usually call the "compressor" the "heart" of the refrigerator. Refrigerator compressor start method 　　 (1) Working principle of impedance split-phase starting type 　　The stator winding of the compressor motor is an inductive coil. Because the wire diameter and the number of turns of the running winding and the starting winding are different, the impedance is also different. When the two windings are connected to the AC circuit, the current in the running winding lags the voltage by 90° to produce two different inductance values, although the 50Hz alternating current of the same phase reaches the two windings, and the two windings will The current and voltage values ​​that produce different phase differences play the role of resistance phase separation and generate starting torque. When the motor speed reaches 70%~80% of the rated speed, the start winding is disconnected from the start winding circuit under the control of the start relay, and only the running winding drives the motor to run. 　　 (2) Working principle of capacitor start The compressor motor capacitor start-up circuit is similar to the impedance split-phase start-up circuit. The difference is that a 220V, 45~100μF capacitor is connected in series in the start-up winding, which increases the phase split phase difference of the circuit and the start-up torque. Increase, the starting current is reduced, greatly improving the starting characteristics of the circuit. 　　 (3) Working principle of capacitor starting and capacitor running The starting circuit of the compressor motor with capacitor start and capacitor operation is different from the capacitor start circuit: a small-capacity capacitor is connected in parallel next to the start relay and the start capacitor. When the start process is over, the start capacitor is cut off from the circuit After that, the starting winding is still in parallel with the running winding, so the starting winding can bear part of the motor load, so that the efficiency of the motor can be improved. Refrigerator compressor does not start processing method 　　 Modern life, basically every household will buy a refrigerator. When the refrigerator is in use, there are sometimes failures such as no refrigeration and the compressor does not start. When we encounter the refrigerator compressor does not start, we can find out the reason why the compressor does not start, which is more convenient for us to carry out the refrigerator maintain. The editor today will introduce to you the reason why the refrigerator cannot start and the solution. 　　 First: Check whether the circuit power is turned on. 　　The compressor does not start, it can usually be expressed from the power circuit, such as power failure, poor switch contact, fuse blown, etc. If you find these phenomena, you should analyze them comprehensively and find the root cause to eliminate. 　　Refrigerator compressor does not start 　　 Elimination method (1) Check whether the input power circuit has power, that is, whether the line entering the knife switch has power, generally can be measured with a multimeter and a test pen. If it is found that the fusible link is blown, the cause should be investigated and replaced with a new fusible link according to the specifications. (2) Check the accessories of the press, including thermal protection and relays. If the thermal protection is broken, the press cannot be energized. The failure of the relay generally means that after the press is energized, the motor does not rotate and emits a "buzzing" noise. In this case, the machine should be stopped immediately, otherwise the motor winding will be burned if the time is too long. (3) Check whether the contacts of each connector are intact, whether the plug is tight, and whether there is damage. If there is poor contact in the connector, the motor will not rotate or make a "buzzing" sound. 　　 Second: Check whether the circuit voltage is normal 　　 If the voltage of the fault analysis circuit is significantly lower than the rated value, the motor is not easy to start and emits a "buzzing" sound. 　　Removal method Use a voltmeter to measure the voltage. If the voltage is low, you need to instruct the user to purchase a voltage regulator to increase the voltage value for operation. 　　 Third: Check whether the contacts of each relay are connected 　　Refrigerator compressor does not start 　　Whether the temperature relay contact is connected 　　 Failure analysis: Sometimes the leakage of the temperature-sensitive refrigerant will cause the contact to open. Remedy: Remove the cover of the relay box to check the contacts. If it jumps, it means that the original set value has not been adjusted or the temperature sensor in the temperature sensor has leaked. You can turn the adjustment lever of the relay to a low temperature scale region. To see if the contact is closed, if it is not closed, remove the temperature sensing plate and immerse in warm water, and then see if the contact moves. If there is no action, it can be preliminarily determined that the temperature sensing agent is leaking, and a new thermostat must be replaced. 　　 Fourth: Motor and electrical faults 　　 Burned motor winding or short circuit between turns 　　Fault analysis: When the motor winding is burned or the turn is short-circuited, the fuse will often be repeatedly broken, especially when the switch is pushed up. 　　Removal method: use a multimeter to check whether the terminal and the shell are short-circuited. The resistance of each phase, if it is short-circuited or the resistance of a certain phase is small, indicates that there is a short circuit between windings and turns, and the insulation is burned. A megohmmeter can also be used to check its insulation resistance during inspection, if its resistance is lower than 2MΩ. If the press burns out, the press can be replaced. , Indicating that the insulating layer has been broken. If the press burns out, the press can be replaced.

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