The working principle of Roots blower is that when the motor drives the driving shaft to rotate through the coupling or pulley, the gear installed on the driving wheel drives the gear on the driven wheel to rotate synchronously in the opposite direction, so that the engaged rotor rotates with each other, thus forming a space between the casing and the rotor, and the gas enters the space from the air inlet. At this time, the gas will be compressed and squeezed out of the gas outlet by the rotor, while the other rotor will turn and form a new space with the other side of the casing at the relative position of the first rotor at the beginning of compression, and the new gas will enter this space again and be squeezed out, so as to achieve the purpose of blowing continuously.
Auxiliary cooling measures. General Roots drum Fan cooling includes water cooling and air cooling. Air cooling can be used according to technical requirements. If the temperature is high, water cooling is required. In order to ensure the normal use of main and auxiliary oil tanks, cooling treatment is also required to reduce the temperature of lubricating oil. The temperature of general lubricating oil shall not exceed 65 ℃.
In winter, we should also pay attention to the water-cooled roots drum When the fan is not used for a long time in winter, the water in the cooling pipe should be drained to avoid freezing crack of the cooling pipe.
Impeller clearance design. Roots drum When designing the fan, the clearance between the impellers will also affect the heat dissipation, such as the casing clearance, impeller clearance, wallboard clearance, etc. These are also the key points in the design. Some small manufacturers have short service life because of poor design.
The design of impeller clearance shall meet certain standards, and it shall also be checked during use. During the annual overhaul, the dust and dirt on the impeller shall be treated to ensure that the impeller clearance is within the standard error, and the clearance is not too small.
Strengthen protection for vulnerable parts. The lubricating oil is Roots drum The fan is easily damaged by high temperature, so the cooling treatment of lubricating oil needs to be protected in many ways. In addition to the application of water cooling, we also need to carry out other treatment. From the inside of the casing to the wall panel and then to the lubricating oil, the temperature should be reduced in order for cooling treatment.
Influence Roots drum There are many factors affecting the fan outlet temperature, mainly including: Roots drum Volume efficiency of fan, working pressure, internal leakage of fan, temperature of suction air, etc. However, many factors have much to do with the technical level of the manufacturer. The three blade roots blower has been shaped once it is formed. What the site can do is to reduce the outlet pressure (in many cases, the sewage treatment plant, aquaculture, etc. are subject to process restrictions, and the outlet pressure cannot be reduced), reduce the temperature of the suction air, or manually reduce the outlet temperature by other means. Specifically, the cooling of three blade roots blower on site can be started from the following aspects:
1. Roots drum If the fan is installed indoors. If possible, air conditioners and fans can be installed for cooling. Don't regret air conditioning and electricity. Because the life of the motor will be greatly reduced when the temperature increases by 10 degrees. Therefore, indoor air conditioning can not only prolong the service life of equipment, but also reduce the outlet temperature.
2. Some places have requirements for noise. If there is a soundproof cover, the door of the soundproof cover must be opened in summer. The sound insulation cover forms a closed space, which increases the ambient temperature, resulting in high temperature of the air inhaled and high outlet temperature. Many three blade Roots blowers with sound insulation cover have inlet temperatures exceeding 45 ℃ in summer.
3. Reduce pipeline bends and other pressure losses as far as possible.
4. Empirical formula, three leaf roots drum Outlet temperature of fan=inlet temperature+(10-12) * pressure
The unit of pressure here is meter water column. For example, if the water level is 6 meters, the pressure loss of pipeline loss and membrane loss (membrane of aeration pipe of sewage plant) is 1 meter, and the ambient temperature is 30 degrees, then the outlet temperature will be 100-114 ℃. According to this formula, we can understand the significance of reducing the inlet temperature and outlet pressure.
5. Another stupid method is to install a sink at a distance of about 5~10 meters from the pipeline outlet (especially suitable for the air blast aeration of aquaculture, sewage treatment, etc.), which can effectively reduce the outlet temperature.
I believe that after reading the above, you should also pay attention to Roots drum I have learned some basic measures for cooling fans in high temperature season, and I hope it will be helpful to everyone.
Text word tag: Roots drum Fan
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