人妻少妇乱子伦精品_久久精品国产字幕高潮_国产AV无无码精品_国产亚洲专区无码

Safety management of refrigeration and air conditioning systems and their safety devices

2022-07-28

Precautions for System Operation (1) The power supply is not disconnected during maintenance and maintenance of refrigeration equipment, which is prone to personal accidents and should be powered off for maintenance. (2) When the refrigeration system is running, it is found that the pointer of the high-pressure pressure gauge is beating violently

View Details

Difference between ventilator and blower

2022-01-10

The fan is a machine that relies on the input of mechanical energy to increase the gas pressure and supply the gas side by side. It is a kind of driven fluid machinery.?? Ventilator widely used in factory

View Details

Characteristics of direct negative pressure fan

2021-11-12

1. Special motors for IP55 and F insulated aluminum fan produced by foreign advanced technology. Long service life, smooth operation, low noise, and at the same time with phase, overload protection.

View Details

Development and Application of High Performance Coating for Wind Turbine Blade

2021-11-12

At present, there is no unified reference standard for the anti-corrosion system of domestic fan blades, which is caused by the composition of fan blades and their special operating conditions. Fan blades are made of glass fiber composite materials, and the applicable substrates of corrosion resistance standards ISO 9223 and ISO 12944 are metal and cannot be directly referenced. Because the fan blades are mostly in a very harsh corrosive environment and rotate at high speed all year round, the linear velocity of the blade tip is often more than 70 m/s, and the corrosion condition is different from that of the steel structure, which can be clearly seen in the actual operation of each wind farm. In general, the fan blades in addition to the loss of light, pulverization and wind erosion, pollution, wear, shedding, tearing and other phenomena. The corrosive environment of fan blades has the following characteristics: strong ultraviolet radiation, strong wind, sand, dust, hail and other impact and wear, corrosion by -30~50 ℃ temperature changes, high humidity and strong salt spray corrosion in the south or coastal areas.

View Details

What type of machine is a duct fan?

2021-11-12

Duct fan is a kind of ventilation equipment. In the confined space of industrial workshop, air cannot circulate. It is a common product in industrial workshop. We don't know much about duct fan. What product is duct fan?

View Details
< 1 >