Beijing fan repair professional kitchen exhaust fan repair sales and installation

Mobile 13121565588 Our long-term maintenance of all kinds of fans, fan repairs including exhaust fans axial fans, centrifugal fans, roof fans, blower, hot air, suction fan and fan installation, central air-conditioning fan coil professional maintenance staff can come services; hospitality; reasonable price; excellent quality; an impeller wheel causes the main reason for the imbalance of an imbalance in use can be briefly divided into two: the impeller wear and impeller fouling. Resulting in both cases before the induced draft fan into contact with the dust removal device related, dry dust caused by the impeller means to wear the main reason for the imbalance, and wet dust impact impeller means to scale the main reason for the imbalance. It is described below. Impeller wear dry flue gas dust removal device although you can get rid of most of the large dust particles, but a few large and many small particles of dust particles along with high temperatures, together with high speed through the smoke fan, the blades subjected to continuous continue to scour. Over time, the formation of knife-edged blade wear at the outlet. Since such wear is irregular, thus causing an imbalance of the impeller. In addition, the impeller surface is easily oxidized at high temperatures to form a thick oxide. The binding force of the impeller surface oxide is not uniform, some effects of scale by vibration or centrifugal force will automatically fall off, this is a cause wheel imbalance. 2. Impeller fouling by wet dust removal device (Venturi Water Dust) cleaned flue gas is very humid, though not eliminated net of small dust particles, but a large viscosity. When they are through the fan, in the role of gas vortices will be attracted to non-working surface of the blade, especially the more serious form of dust fouling in non-face at the entrance and exit, and gradually thickening. When part of the grime off the joint effect of centrifugal force and vibration, balance impeller is destroyed, the whole draft fan will vibrate. Second, to address the imbalance of the impeller measures 1. Solution impeller wear on the impeller dry dust caused by wear and tear, in addition to improve precipitator dust effects, the most effective way is to increase the wear resistance of the impeller. Currently, this more mature approach is thermal spray technology, which uses a special means to wear, high temperature materials such as metal or ceramics to become high-temperature, high-speed stream of particles, is sprayed onto the surface of the impeller blade, forming a ratio impeller wear material itself, a much higher temperature and oxidation resistance of super coat. This will not only reduce the wear and tear caused by the destruction of impeller balancing, but also reduce the oxide layer caused by an imbalance problem. Selection of draft fan, the dry dust should be preferred thermal spray process through impeller. Use without overheating the impeller spraying process, when equipment maintenance, consider impeller thermal spraying. Although this will increase the impeller manufacture or maintenance costs, but to improve the life of the impeller l ~ 2 times, extending the induced draft fan overhaul cycle. Thereby reducing operating costs induced draft fan and the entire production system, comprehensive benefits good. 2. Solve impeller fouling (1) spray cleaning: This is a common method of cleaning, sprinkler system installed in the induced draft fan casing, the pipe, 3 nozzles (one located at the outlet of the impeller, 2 is located at the entrance) and drain hole components. Water is generally the water pressure of about 0.3MPa. This method is generally still effective. The disadvantage is that every time down descaling longer, stopping several times per month descaling. Affect the normal use of the unit. (2) high-pressure gas cleaning: The system uses a similar structure with a sprinkler system, but its pipeline of high pressure pipes, special nozzles and high-pressure gas source. This means the blade cleaning is fast and efficient, it can be induced draft fan normal shutdown of the gap, open the high pressure gas source, just tens of seconds of time to complete the cleaning. Because of simple operation, many times a day can be, not only to solve the artificial cleaning laborious, time-consuming problems, but also significantly reduce the production cost of the entire unit. The question is whether users have existing high-pressure gas source (pressure between 0.8 ~ 1.5MPa, you can use compressed air or nitrogen), or require a special high-pressure compressor equipment. (3) continuous purge stream cleaning: Structurally, continuous purging device requires no external gas source, which uses exhaust pressure induced draft fan itself, a small amount of smoke (1% to 2% of the rated air volume) from Internal drawing fan toward special nozzle, the nozzle located imports impeller at high speed onto the non-working smoke cough surface of the blade, which is continuously purge it with the induced draft fan started to open, Not only will just stick to blow off the dust on the leaves, but also to prevent dust deposition thickened and no downtime cleaning. The simple structure, very small changes to the induced draft fan, anti-scale works well, is a promising new technology development. 3. Street impeller moving flat correction either by thermal spraying impeller treatment, or the use of various methods of cleaning the impeller, the effect will not be once and for all. Induced draft fan after prolonged use, there will still be vibration exceeds the allowable upper limit order situation. At this point, the impeller imbalance can only be solved by balancing correction. Conventional impeller balancing correction is usually on the balancing machine, which is the use of the fan, especially large fan is very convenient. Therefore, on-site dynamic balancing technology in recent years more to get people's attention. Compared with the conventional method of the main advantages are (1) avoid cumbersome dismantling work, saving disassembly and transportation costs, reducing maintenance time; (2) to save the original installation accuracy, improve the whole draft fan balance accuracy.