Bosch Filter 0986AF2271

08/09/2020

Screw compressor structure

The screw compressor is composed of a pair of parallel and intermeshing female and male screws. It is the most widely used rotary compressor. There are two types of single screw and twin screw. Generally speaking, screw compressor refers to twin screw compressor.

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.

09/03/2020

Modified atmosphere packaging of nitrogen generator for food preservation<br></br>

Modified atmosphere packaging (MAP) accompanies many aspects of our lives and we benefit from it every day. In the supermarket, we hope to find a variety of fresh food, such as fresh bread,

08/24/2020

What should I do if the suction pressure of the refrigeration unit is too low 7 major failure causes to know

In the pharmaceutical, food and other industries, refrigeration units are common equipment, providing reliable protection for various low-temperature environments such as pharmaceuticals.

08/24/2020

How to use refrigerant to empty the air conditioner after installation

Air, the moisture and impurities contained in the air in the air conditioner system will cause increased pressure, increased current, increased noise, increased power consumption, etc.,

08/25/2020

How to calculate the power consumption of central air conditioning

In summer, every household will turn on the air conditioner, so how is the power consumption of the central air conditioner calculated? This is also related to the air conditioner's horsepower, cooling capacity, compressor power, and temperature difference between indoor and outdoor.

09/05/2020

Where does the air compressor rental market go

At the beginning of 2017, Dr. Li in the construction industry said that the international sales of construction machinery hours to leasers have reached more than 25% of the total machinery output value,

09/22/2020

Features of frequency conversion air compressor

6.1. Save energy? Reduce electricity consumption? Improve corporate competitiveness　　 7.§Air compressors and air conditioners often account for more than 30% of the company's electricity consumption.　　

06/14/2020

Danfoss cocuses on providing energy efficient, sustainable and smart refrigeration compressors for a varied range of commercial applications such as cold rooms

08/20/2020

The precursor before the problem of the evaporator in the industrial chiller

The overall stability of the various industrial chillers produced in China is very high. As long as the daily maintenance and maintenance of the chillers are carefully completed, the service life of the chillers is very long.