A wear-resistant fan

Abstract

The invention aims to provide a wear-resistant fan suitable for delivering high-concentration dust. The wear-resistant fan comprises a rotor spindle, a wheel cap and a blade. The blade is formed by welding an inner central disk and an outer central disk, the rotor spindle is fixedly connected with the inner central disk through a connecting bolt, the wear-resistant fan is characterized by further comprising a protection cover, one end of the protection cover is welded with the spindle, the other end of the protection cover is welded with the inner central disk, and accordingly the connecting bolt covers an inner space enclosed by the protection cover, the spindle and the inner middle disk. An air inlet end of the blade most subjected to wear is protected by utilizing a wear-resistant nose, the blade is protected by utilizing a wear-resistant plate, and the wear-resistant nose and the wear-resistant plate can be replaced limitlessly, and accordingly service life of a rotor of the fan can be greatly prolonged; and time for maintenance and replacement is greatly shortened, loss of a user caused by halt is lowered to the minimum, and accordingly cost is saved, and productivity is increased.

Description

technical field [0001] The invention belongs to the field of fluid machinery, and in particular relates to a wear-resistant fan. Background technique [0002] At present, fans are widely used in various industries such as chemical industry, mining, metallurgy, and environmental protection. Due to the limitations of some process requirements and the need to make the medium conveyed by the fan rotor have a high dust concentration, such as a dust concentration greater than 100-200 grams per cubic meter , the rotor wears quickly during use and has a short lifespan. Some have a lifespan of only two to three months. The cost of a larger fan rotor can reach hundreds of thousands. Whether it is frequent maintenance or replacement, it will bring huge losses to users. , so it is an urgent need to develop a long-life fan for transporting high-concentration dust. [0003] The rotor of a traditional fan is composed of the main shaft, the connecting bolts of the main shaft and the impell...

AI Technical Summary

Problems solved by technology

[0004] 1. The surface of the blade is pasted with ceramics, but the ceramic sheets are greatly affected by the vibration of the fan and the quality of the adhesive glue. During use, the ceramic sheets often fall off, and they must be stopped for repairs. At the same time, they are limited by the adhesive glue. The temperature of the medium currently used Generally not more than 150 degrees Celsius

[0005] 2. Surfacing wear-resistant alloy on the blade body. Surfacing welding will damage the blade body, which will reduce the strength of the blade and reduce its safety. Therefore, only interval welding can be used, and wear-resistant welding cannot be used on the entire blade surface. At the same time, it is limited by the thickness of the blade body. The thickness of the surfacing welding is generally less than 8 mm. If it is too thick, it will easily cause the surfacing welding to fall off while damaging the blade, because the wear-resistant thickness is thin and the gap between the surfacing wear-resistant layer Gap effect, in actual use, it is often necessary to stop the machine to repair the wear-resistant layer after failure, and repair welding on the impeller, because the impeller flow path is narrow and the wear part and wear amount of the blade are different from place to place, and the uniformity of manual repair welding, The consistency is poor, which leads to uneven impact and wear of the dust-laden airflow on the wear-resistant surface of the blade during operation, resulting in damage to the rotor balance of the fan, and it has to be stopped for maintenance. Generally, after several repairs, the impeller is scrapped

[0006] 3 Invention patent --- "A wear-resistant boiler induced draft fan impeller application number: 201210172452" and utility model --- "A new type of wear-resistant fan impeller, authorization announcement number: 202520616u" both propose to set the Abrasive material, but the wear-resistant material is very difficult to repair and replace after long-term use and failure

[0007] 4. The surface of the existing blades is protected by wear-resistant plates, which are all welded around the wear-resistant plates and the blades, and the middle hole is plug-welded. After the wear-resistant plates fail, the welds need to be blown off manually and replaced with new ones. Wear-resistant plate, but the space in the flow channel of the impeller is narrow, so it is very difficult to repair and replace; and in order to ensure the connection strength between the wear-resistant plate and the blade, it must be welded firmly, so the weld length of the connection is long, and the connection that needs to be blown off after repeated repairs At the same time, the weld seam also caused damage to the blade, resulting in a limited number of maintenance and replacement of wear-resistant plates, and at the same time, the maintenance intensity was relatively high

[0008] The inlet end of the impeller blade is the most severely worn part of the rotor, so this part is the most prone to wear and failure. Therefore, how to improve the wear resistance of this part is also the main problem. The blade strength or the way to replace the blades does not mention how to prevent wear, and the replacement method requires downtime, affects production, and increases costs

Images