Working principle of scroll compressor_Characteristics of scroll compressor

Working principle of scroll compressor_Characteristics of scroll compressor Working principle of scroll compressor    Scroll compressor is a kind of positive displacement compression compressor, the compression part is composed of movable scroll and static scroll. This includes many structural features that divert the flow of gas through the compressor housing to reduce entrained oil. After entering the housing, some gas flows upward to reduce the amount of gas flowing downward toward the oil. To achieve this, the motor of the compressor may be surrounded by a sleeve having upper and lower holes for guiding the airflow to the turns of the upper and lower stator ends of the motor. In some embodiments, the suction inlet is importantly positioned relative to the two gas passages between the stator and the motor housing. The location of the inlet allows a channel to receive incoming gas and divide the flow into two opposite directions, namely upward and downward flows. The other channels only send gas upward. In addition, suction baffles, diffusers, streamlined counterweights, and suction tube oil catchers can also assist in gas-oil separation or minimize entrained oil.    Scroll compressor is formed by the dynamic and static scrolls with two double function equations interlocking each other. In the process of suction, compression and exhaust, the static plate is fixed on the frame. The moving plate is driven by the eccentric shaft and controlled by the anti-rotation mechanism. It rotates around the center of the base circle of the static plate and makes a plane with a small radius. The gas is sucked into the periphery of the static disk through the air filter. With the rotation of the eccentric shaft, the gas is gradually compressed in the crescent-shaped compression chamber formed by the dynamic and static disk phasing, and then continuously discharged through the axial hole of the center part of the static disk. Scroll compressor characteristics    Excellent low temperature performance, high efficiency and energy saving (high volumetric efficiency): In medium and low temperature applications, the volumetric efficiency is more than 30% higher than the traditional piston machine.    Beautiful appearance, outdoor installation, space saving: compact system design, easy to install and maintain; remove the machine room, save floor space, and save rent.    Smooth operation, low noise and vibration, reduce the impact on the environment. The unique design of the scroll compressor makes it an energy-saving compressor in today's world. The main operating parts of scroll compressor scrolls only have a combination of no wear and tear, so the life is longer, known as maintenance-free compressors. The scroll compressor runs smoothly, has little vibration, and has a quiet working environment. It is also known as a'super-static compressor'. The scroll compressor has a novel and precise structure, and has the advantages of small volume, low noise, light weight, small vibration, low energy consumption, long life, continuous and stable gas transmission, reliable operation, and clean air source. Known as the "new revolutionary compressor" and "maintenance-free compressor" are ideal power sources for pneumatic machinery, widely used in industry, agriculture, transportation, medical equipment, food decoration and textile industries and other occasions that require compressed air . A scroll compressor includes: a drive shaft, which can rotate clockwise or counterclockwise, and has an eccentric portion of a predetermined size; a cylinder, which forms an internal volume of a predetermined size; a roller, which contacts the inner circumferential surface of the cylinder , And can be rotatably mounted on the outer peripheral surface of the eccentric portion, can roll along the inner peripheral surface, and together with the inner peripheral surface to form a fluid chamber for fluid suction and compression operations; blades, elastically mounted on the cylinder, so that It is in continuous contact with the roller; the upper and lower bearings, which are installed on the upper and lower parts of the cylinder, are used to rotatably support the above drive shaft and close the internal volume; the oil flow path is provided between the bearing and the drive shaft, and Make the organic oil flow evenly between them; the discharge port, which communicates with the fluid chamber; the suction port, which communicates with the fluid chamber and are isolated from each other at a predetermined angle; the valve assembly, which is selected according to the direction of rotation of the drive shaft One of the suction ports is opened sexually.

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What are the causes of air conditioning trip

06/20/2020

What are the causes of air conditioning trip

What are the causes of air conditioning trip 1. The contradiction between the rated current of the air conditioner and the current carrying capacity of the wire.   Here are two formulas involved:   ①The rated current of air conditioner I=P÷U ÷power factor, the power remains unchanged, the smaller the voltage, the greater the current required.   ② The current carrying capacity of the wire I=U÷R, the voltage is proportional to the current.    So when the power supply voltage is normal, we must consider the line voltage drop. The longer the line, the greater the resistance, the greater the voltage drop, and the smaller the output current at the end. However, because the power of the load remains unchanged, the voltage becomes smaller, and the current that needs to be output will be larger. At this time, the wire is forced to overload, and the time will cause heating, and eventually cause the tripping of the open circuit.    Some friends said that the heat of the wire will not cause the tripping of the circuit breaker. In fact, the manufacturer of the air switch has made it clear in the relevant manuals that the heat of the wire will cause the air switch to trip. Because the wire heats up, the crimp terminal will also heat up, and the resistance will become larger and larger. The larger the resistance, the greater the current consumption, and the hotter it will be, a vicious cycle.    2. Leakage   During the daily maintenance work, we will encounter the situation that the air circuit trips due to the leakage of electricity. At least I have not experienced it once or twice. Regardless of the leakage of the neutral line or the leakage of the live line, a long time will cause the circuit breaker to trip.   Why does the electric leakage cause the MCB to trip? There are two situations.    ① Good grounding. At the beginning, the leakage current was not large, and as time went by, the leakage current became larger and larger, and eventually evolved into a short circuit to ground, unable to close.   ②There is no ground wire. If the equipment is not connected to the protective ground, when the wire leaks to the equipment, it is equivalent to adding a large shunt resistance. Like this problem, if the air conditioner does not have a ground wire, when the wire leaks to the air conditioner, the air conditioner is a very large shunt resistor and will consume a lot of current. Eventually, the wire will heat up or trip open.   How to determine whether the trip caused by the above two aspects can be done with a clamp ammeter.    ① Measure the voltage at the input and output to see if there is a significant change in voltage drop.   ②Measure whether the output current exceeds the standard.    So my suggestion is: first measure the supply voltage to see if it is within the allowable fluctuation range. Then measure the current to see if it exceeds the rated ampacity of the wire. Finally, check the data one by one according to the measured data to find out the reason.

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