PIZZATO Switch PX 22440-DM2

06/14/2020

Give home N95 level protection, home fresh air system, real breathing enjoyment!

Give home N95 level protection, home fresh air system, real breathing enjoyment! After the epidemic, the fresh air system once again refreshed people's understanding.

08/13/2020

How to judge the car air conditioner expansion valve ice block What are the symptoms

If there is moisture in the system, icing and blockage will occur at the expansion valve when the air conditioner is in refrigeration. After the blockage, the air conditioner will not be cooled.

10/06/2025

The main structure of the piston compressor

For piston compressors without crosshead, the main components include the body, crankshaft, connecting rod, piston, cylinder, intake and exhaust valves, etc.; for piston compressors with crosshead, in addition to the above parts, there are cross Head and slide, piston rod and stuffing box, etc.

08/31/2020

Discussion on the sales strategy of air compressor equipment

The characteristics of air compressor equipment sales are large unit product value, long customer transaction cycle, more variables in the transaction process, relatively rational customer decision-making,

09/06/2020

Application of Piston Rod Settlement Monitoring System in Reciprocating Compressor

1. Introduction A petrochemical plant imported a reciprocating compressor from abroad, the model is: B254-4118N3.3, 4 rows of symmetrical balanced type, the import and export parameters are: 135kPa (A)@14℃, 3.4MPa (A)@35℃, rotation speed: 425r/min, stroke: 240mm.

07/07/2020

Earth Hour: Hitachi Central Air Conditioner works with you to speak for the earth

06/14/2020

Broken refrigeration compressor bearings? What can be repaired? Which must be thrown?

Broken refrigeration compressor bearings? What can be repaired? Which must be thrown? How to judge whether the bearing can be used again and the defects of the bearing need to be replaced To determine whether the bearing can be used again, it should be 器2䀀
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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.

08/11/2020

7 tips for identifying the quality of central air conditioners, absolutely practical!

1. Appearance comparison<br></br> 　　 Everyone shouldn't be surprised. "Take a machine by appearance" is very practical under certain circumstances. First of all, the surface of the electroplated parts should be smooth and flat, without scratches, peeling, and bottoming.

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.