Several methods to detect the quality of refrigerator compressor

Several methods to detect the quality of refrigerator compressor

The compressor is the heart of the refrigerator refrigeration system, and its quality directly affects the performance of the refrigerator. Therefore, in the process of detecting the quality of the refrigerator, the new, old and operating status of the compressor should be focused on. But ordinary consumers don’t know how to conduct professional testing. What tips can okmarts.com teach you to test the quality of refrigerator compressors?

　　1. Detect the quality of the compressor from the sound

　　1, normal sound

　　1) Clang:

　　When the compressor in operation stops, it will produce this kind of clanging sound, sometimes it sounds once, sometimes it sounds twice, and the noise is louder. This noise comes from the inside of the compressor. The reason is that there are three springs in the compressor that suspend the cylinder and the stator to prevent shock. When the compressor stops working, it will produce a kind of resistance. Due to the action of the spring, the cylinder is moved to both sides. It swings and produces a metal knocking sound, which is a normal sound.

　　2) Pops:

After the compressor has been running for a few minutes or stopped for a few minutes, a popping sound can be heard. This sound depends on which part of the refrigerator. If it is behind the refrigerator, it is usually the condenser copper tube or shutters to dissipate heat. The sound produced by thermal expansion and contraction. If this sound comes from the upper part of the refrigerator, it is usually the evaporator hoisted in the upper part of the refrigerator. Due to the change of temperature from cold to hot, the hoisting parts are frozen together. The crackle caused by tearing. The above two kinds of noises are normal.

　　3) Rumble:

　　 During the use of the refrigerator, whenever the compressor starts and stops, a rumbling sound is often heard in the tube, which is the sound of liquid refrigerant flowing. In a pressurized liquid pipeline, when the liquid flows, there is a rolling sound of water. This sound is loud when the compressor starts and stops. For example, when the compressor is started, the liquid refrigeration is instantly impacted by high pressure, that is, it should start to flow, and it will make a rumbling sound of liquid flow from back waves to front waves. Once the liquid flows smoothly, The noise is reduced; when the compressor stops running, the pressure decreases or disappears, but the flow of liquid cannot stop for a while. Although the speed of the front wave slows down, the inertial force of the back wave is relatively large, and it still rolls forward with a booming sound, followed by a sound Disappear, this is a normal phenomenon.

　　2, what are the abnormal noises?

　　1) Impact sound:

　　When the compressor is running, there is a metal impact sound in the machine. This sound is caused by the high-pressure silencing fracture in the compressor. It often occurs in the refrigerator. This kind of sound needs to cut the shell, replace the high-pressure muffler tube or weld the broken part.

　　 2) Boom:

When the compressor is running, there is a roaring sound in the machine. This kind of sound is a broken or dislocated spring of the steam hanging in the machine, causing the cylinder to collide with the casing. This is an abnormal sound. sound. This kind of sound needs to cut the shell, check the cause of the dislocation of the suspension spring, or the cause of the break, and eliminate them separately.

　　3) Buzzing sound:

One refers to the buzzing sound of the compressor after the compressor is turned on, due to the high or low voltage of the power supply, the overheating of the heating wire of the overload protection relay, the jamming of the moving parts in the machine, etc., which makes the compressor difficult to start; the other is This is the buzzing sound of the pipeline being suspended for too long without anti-vibration measures. The solutions to this sound include: In the first case, the voltage is too high or too low. The voltage stabilizer is generally used to solve the problem; the compressor itself must be cut and repaired; the fault caused by other control appliances must also Check and eliminate one by one. In the second case, measures of reinforcement, cushioning and isolation are taken to solve it.

　　4) Click:

　　 The main reason is that the pipes are very close to each other or the pipes are close to the refrigerator wall. When the compressor is running, it will produce a clicking sound; in addition, the loosening of screws will also make this noise. The solution to this kind of sound is as follows: During the operation of the refrigerator, press each part of the vibration with your hand. When pressing to a certain part, the sound is significantly reduced or eliminated, that is, the source of the sound is found. You can use padding, reinforcement, The method of isolation can be solved.

　　 2. Check the compressor's newness from the appearance

　　 1. Appearance

　　 Brand-new refrigerator compressors are usually smooth in appearance, bright in color and not rough. The welding ports of the input and output pipes are directly welded to the evaporator at one time. If it is re-welded, there will usually be traces of polishing. 　　2. Production date label 　　New compressors have nameplates, which are marked with the compressor model, serial number, date of manufacture, power level, etc., which can be checked. 　　3. Temperature 　　 When the compressor is running, the shell can be touched with the back of the hand, and the shell should not be too hot. 　　 4. Sound When the compressor starts to rotate, no abnormal mechanical noise should be heard. As the operating time increases, the compressor should emit a clear, uniform and smooth running sound, and the sound will gradually decrease. When the compressor is stopped, the compressor will not An unusual sound is made.