Under the design conditions, the wind turbine with a wind pressure of 30kPa~200KPa or a compression ratio of e=1.3~3 belongs to the category of high pressure blowers. At present, the gas ring vacuum pump is generally classified as a high pressure blower in the industry. High-pressure fans, also called high-pressure blowers, are distinguished from general centrifugal high-pressure blowers.
What is a high pressure blower? High-pressure fan selection considerations
The history of the development of high pressure fans
The working principle of the high-pressure blower was discovered at the University of Hanover in Germany in 1933, and the products were successfully manufactured. Up to now, the application of high-pressure blowers has been popularized. It is widely used in industrial and agricultural areas, covering infrastructure, automobile industry, plastics industry. , chemical, food, pharmaceutical, medical, electrical and electronic, light industrial textiles, ship and railway, aerospace engineering, has made outstanding contributions to the prosperity and progress of the world.
How high pressure fans work
When the impeller 3 rotates, the wind direction causes the gas to move forward and outward due to the centrifugal force, thereby forming a series of spiral motions. The air between the impeller blades rotates in a spiral shape and squeezes the gas outside the pump body into the side groove (inhaled by the suction port 1). When it enters the side channel 2, the gas is compressed and then returned to the impeller blade. Speed ​​up the rotation again. As air passes through the impeller and side channels along a spiral track, each impeller blade increases the degree of compression and acceleration, and as the rotation progresses, the kinetic energy of the gas increases, causing the gas pressure passing along the side channels to further increase. When the air reaches the junction of the side channel and the discharge flange (the side channel narrows at the outlet), the gas is forced out of the blade and discharged through the outlet muffler 4 to the pump body.
High pressure fan features
In general, high pressure fans have the following characteristics:
1. It has dual functions of blowing and sucking. It can be used for both air and air. There is a high pressure fan of the Champions League blower series. It can also use suction and air blow at the same time, which is equivalent to the function of the rotary vane vacuum pump.
2, less oil or no oil operation, the output air is clean;
3. Compared with centrifugal fan and medium pressure fan, the pressure is much higher, often more than ten times that of centrifugal fan.
4. If the pump body is integrally die-cast and the shock-proof mounting foot is used, its requirements for the installation base are also very low. It can even operate normally without fixing the foot. It is very convenient and saves installation costs. And installation cycle;
5. Relative to other types of fans, such as Roots blowers, the noise of their operation is lower, the greater the power, the more obvious, more than 5.5KW will be displayed;
6, maintenance-free use; its loss parts are only two bearings, within the warranty period, basically no maintenance;
7. The mechanical wear of the high-pressure blower is very small, because there is no other mechanical contact part except the bearing, so the service life is of course very long. As long as it is under normal use conditions, there is no problem in 3 to 5 years. of.
8, easy to install, easy to use!
High-pressure fan selection considerations
The use of high-pressure fans is very extensive, as its selection is relatively complex. In general, you need to do the following two steps:
1. It is necessary to determine what function of the high-pressure fan is used in the field. Whether it is suction or blowing, find the pressure-flow curve corresponding to the high-pressure fan; if you read the wrong curve, sometimes the selected product cannot be used;
2. According to the calculated pressure and flow rate, find the working curve above the working point corresponding to the pressure and flow rate on the graph; then select the high pressure fan model according to the working curve;
As long as they are different work sites, their demand for pressure and flow is different. Therefore, in order to obtain relatively accurate data, relevant calculations are needed. This needs to be done by a professional designer or by a professional company.
Installation precautions for high pressure fans
1. Flat washers and spring washers must be used to tighten the screws;
2, it is best to use rubber buffer rubber to withstand the weight of high-pressure fans, especially high-power high-pressure fans, essential;
3. For some occasions where noise is required, a silencer can be added to reduce the noise (generally about 5dB), and the silencer is installed at the end of the air inlet duct or the air outlet duct;
4. For some occasions with high noise requirements, you can meet the noise requirements of the site according to the conditions of the machine itself, plus a layer of silencer, specifically consult the manufacturer of high-pressure fans or professional noise control company;
5. When using silencer cotton silencer, pay attention to the distance between the high pressure fan and the box, pay attention to the ventilation and heat dissipation of the high pressure fan, pay attention to the use of rubber buffer rubber to bear the weight of the high pressure fan, specifically need to consult the manufacturers of high pressure fans, such as the Champions League blower, Full wind, etc.;
6. The inlet and outlet of the high-pressure fan are connected by pipes, and hoses should be connected to isolate the vibration.
Precautions for use of high pressure fans
No matter which brand of high-pressure fan, it needs to be protected in two aspects: one is pressure and the other is dust.
For pressure, the pressure relief valve is often used. It is an unloading valve. When the pressure of the high pressure fan exceeds the pressure set by the pressure relief valve, the pressure relief valve will automatically open to release the excess pressure. Protect high pressure fans.
For dust, filters are often used. It is based on different use sites, often using different filter precision filter cartridges, different filter cartridges have different maintenance methods and service life, you need to ask when ordering.
In some special occasions, special protection is needed: for example, when using in a sealed environment, pay attention to ventilation and heat dissipation; when the ambient temperature (the intake air temperature is relatively high), pay more attention to ventilation and heat dissipation, or choose to allow air intake. High-temperature high-pressure fan (such as a Champions high-pressure fan, allowing the inlet air temperature to reach 70 degrees);
For some brands of high pressure fans, there may be their own recommendations for use, it is best to have a more detailed understanding before buying.
High pressure fan common faults and troubleshooting methods
(1) The fan does not rotate
1, not connected to the power - turn on the power
2, the motor does not work - check the motor wiring or replace the motor
3, the fan head is damaged - repair the fan or replace
4, foreign matter stuck in the fan - remove foreign objects
(2) Increased noise
1, bearing dry lubrication - plus bearing grease
2, bearing damage - replacement of bearings
3, impeller wear - replace the impeller or pump head
4, the solid parts loose or fall off - tighten the fasteners
5, there are foreign objects in the fan - remove foreign objects or replace the pump head
(3) Increased vibration
1, bearing damage - replacement of bearings
2, the impeller is unbalanced - remove the foreign object in the impeller or static balance
3, spindle deformation - replace the spindle or pump head
4, the working state enters the quake zone - adjust the working state, avoid the quake zone
5, the inlet and outlet ports into the filter blockage - cleaning filter
(4) Increase in temperature
1. The inlet temperature is too high - lower the inlet temperature
2, bearing dry lubrication - plus bearing grease
3, the fan efficiency is reduced - remove the leaf dust or replace the pump head
4, work status changes - adjust the working status
5, the ambient temperature increases - increase the environment ventilation
(5) Pressure reduction
1. The pump head speed is reduced - the power supply voltage is low or the motor is faulty.
2, pipe network resistance increased - reduce pipe network resistance
3, work status changes - adjust the working status
4, motor steering reverse - motor rewiring
(6) Flow reduction
1. Import and export gas filter plugging - cleaning filter
2. The pump head speed is reduced - the power supply voltage is low or the motor is faulty.
3, pipe network resistance increased - reduce pipe network resistance
4, work status increases - adjust the work status
5, motor steering reverse - motor rewiring