Ebmpapst Fan D2E133-AM47-A3

09/23/2022

Structural Characteristics of Gear Pump and Its Working Principle

Gear pump is a kind of hydraulic pump widely used in hydraulic systems. It is generally made into a fixed displacement pump.

09/06/2020

New type filter for screw compressor-oil bath air filter

In the environment with high dust concentration in the air, the dust removal filter device used by the screw compressor is mostly paper or fiber material. The accumulation of dust particles is easy to block, and frequent shutdowns are required to replace filter materials.

06/07/2024

Hydraulic Solenoid Valves: Common Faults and Solutions

A hydraulic solenoid valve is one of the commonly used control components in hydraulic systems, and its working reliability directly affects the normal operation of the system. In order to ensure the stability and safety of the hydraulic system, if a hydraulic solenoid valve fails, it needs to be troubleshot or repaired in time.

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.

08/07/2020

Knowledge points of HVAC cold and heat source design

1.The design position of the pump in the system: Generally speaking, the chilled water pump should be located at the front end of the chiller, and the chilled water coming back from the end is pumped back to the chiller through the chilled water pump;

06/14/2020

Physicists create quantum refrigerator

Physicists create quantum refrigerator For decades, atomic physicists have used lasers to slow down the speed of atoms “jumping around” in the gas and cooled them to slightly above absolute zero to study their weird quantum properties.

04/04/2025

Solenoid Valves on KOBELCO Excavators: Locations, Functions, Error Codes and Troubleshooting Methods

When KOBELCO excavator displays error codes starting with D and E, such as D012 and E013, they are a solenoid valve problem.

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

09/07/2020

What happens if the air compressor uses three filters and one oil for an extended period of time

The "three filters and one oil" of the air compressor have a specified service life, which is generally replaced after 2000 hours of use. If you continue to use it beyond the service life, it will bring a lot of harm to the normal operation of the air compressor

03/02/2021

Advantages and disadvantages, function and service life of brushless motor

Advantage: (1) No brush, low interference When the brush is removed from the brushless motor, the most direct change is that there is no electric spark generated when the brushless motor is running, which greatly reduces the interference of electric spark to the remote control radio equipment.