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08/17/2020
Why does industrial chiller have serious odor during use
After long-term operation of industrial chillers, if cleaning and maintenance are not carried out for a long time, the operational stability of industrial chillers will be greatly affected, and peculiar smells will appear.
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06/13/2020
Working principle of York screw compressor
Working principle of York screw compressor Working principle of York screw compressor, screw compressor is a volumetric compression machine with working volume for rotary motion. The compression of gas depends on the change in volume, and the change in v 器2 䀀 ᅵ皥 䖒皦즠Ʋ奌ི 㲈Ʋ 䌁皦 ᮔDž༬皧奖ིЀ 呄ᠾ鹨់༹皧 ࠄ
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09/19/2022
How to Select a Hydraulic Pump
When choosing a hydraulic pump, the following aspects can be considered.
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07/01/2020
What causes the exhaust temperature of the refrigeration compressor to be too high
What causes the exhaust temperature of the refrigeration compressor to be too high Refrigeration compressor is a kind of equipment commonly used in air conditioning and refrigeration. Without it, the air conditioner cannot be cooled normally. However, refrigeration compressors often encounter many problems in normal use. For example, the exhaust steam temperature is too high.
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06/30/2020
The advantages of Copeland compressor car refrigerator
The advantages of Copeland compressor car refrigerator With the improvement of economic conditions, most of us have private cars, and even the public transport vehicles have improved very well. Traditional vehicles do not have on-board refrigerators, and today's vehicles can be modified to include on-board refrigerators.
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01/10/2023
What is a Directional Control Valve?
Hydraulic valves are used to control the flow direction or adjust the flow and pressure of liquids (oil, water, or air) in hydraulic systems.
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08/07/2020
The difference between fixed speed, frequency conversion, DC frequency conversion, AC frequency conversion, digital scroll air conditioner
The difference between fixed speed, frequency conversion, DC frequency conversion, AC frequency conversion, digital scroll air conditioner The fixed speed air conditioner means that the speed of the internal compressor motor is constant and the temperaturﰨ2 䀀 湠疌 V ǜ V 㠠ư㠠ư㠠ư類
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07/05/2020
Hitachi Air Energy Heat Pump Compressor
Hitachi Air Energy Heat Pump Compressor The compressor does not start and has nothing to do with the four-way valve coil heating mode Why can't the compressor of the four-way valve of the air conditioner start up after changing the heating mode? The compressor does not start and has nothing to do with the four-way valve coil heating mode.
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06/19/2020
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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03/10/2021
The main circuit fuse fusing is a common fault of SCR servo driver. The causes of fuse fusing are as follows
The "phase sequence" of power incoming line is incorrect. Due to the synchronization problem between the trigger pulse and the main circuit of SCR servo driver, there are strict requirements on the "phase sequence" of the input power supply. If the "phase sequence" is not correct, connecting the power supply may immediately cause the fuse of the main circuit of the driver to blow.