Relevant experts believe that the research and development of energy-saving fan products must start from the product design and the operation of the fan.

 

First of all, in terms of design, through the application of scientific research results of impellers, volutes and other components, as well as further improving the manufacturing accuracy, we strive to increase the efficiency of various fans by an average of 5%~10%. At present, the most advanced centrifugal fans are due to Using a three-dimensional flow impeller, its maximum efficiency can reach more than 87%; the more efficient axial fan, its maximum efficiency has reached 92%.

 

For example, the 4-71 and 4-74 ternary flow impeller centrifugal fans developed by Shenyang Blower Research Institute in 1992 for the replacement of medium and low pressure centrifugal fans are new products with high efficiency and energy saving, and their efficiency is higher than that of the same type of old fans. Increased by 4%, the average annual electricity saving per fan is about 2000 kilowatts per hour. However, due to the cumbersome manufacturing process of the ternary flow blade used in the fan, the manufacturing cost is higher than that of the ordinary blade fan, and the high technology transfer fee of the product increases the manufacturing cost of the entire fan, which cannot be afforded by the user. Comprehensive promotion in the whole industry.

 

　　Secondly, use imported technology to develop high-efficiency and energy-saving fans. For example, Shanghai Blower Factory Co., Ltd. and Shenyang Blower (Group) Co., Ltd. respectively introduced the technology of adjustable-blade axial flow fans from Germany’s TLT and Danish Novenco; Chengdu Electric Machinery Factory and Shenyang Blower (Group) Co., Ltd. introduced The static blade adjustable axial flow fan technology of German KKK; Wuhan Blower Co., Ltd. introduced the moving blade adjustable axial flow fan technology of Japan’s Mitsubishi Heavy Industries; Guangzhou Fan Factory introduced the axial flow and Centrifugal fan technology; Chongqing General (Group) Co., Ltd. and Siping Jinfeng Co., Ltd. introduced the high-temperature fan technology of British Howteng Company; Shijiazhuang Fan Factory Co., Ltd. introduced the centrifugal fan manufacturing technology of Ebara Company of Japan. Through the introduction of technology, it has effectively promoted the development of energy-saving ventilator products. During the "Eleventh Five-Year Plan" period, wind turbine technology and special-purpose wind turbines should be appropriately introduced according to market demand to fill the gaps in the country.

 

　　 In addition, it is very important to adjust the speed change mechanism and change the operating conditions of the fan products to save energy. At present, most of the fan speed mechanism is relatively backward. Some products use traditional V-belts and worm gear pairs as speed regulators, and most of them are adjusted by adjusting doors. Due to the above reasons, although some fans have high internal efficiency (over 86%), their device efficiency is not very high, and some are even as low as 30%. With the application of fluid couplings and frequency converters in fans , Greatly improving the operating efficiency of the fan, but the number of applications is extremely limited.

 

　　 At the same time, during the "Eleventh Five-Year Plan" period, the development of energy-saving blowers should be vigorously carried out. In this regard, foreign countries have already taken the lead. For example, Japan has made appropriate improvements to the shape of the volute and the impeller of the flow part, which effectively prevents the generation of vortex and flow separation, and its adiabatic efficiency is increased by 5% to 10% compared with the original centrifugal blower; the large flow rate made in Switzerland Centrifugal blower, each stage is equipped with an imported guide vane device, and its variable efficiency reaches 82%; the multi-stage centrifugal blower made in Japan adopts imported guide vanes for continuous automatic adjustment, and the energy saving rate reaches 20%; high-speed single-stage centrifugal type After the blower adopts a high-speed, high-pressure ratio semi-open radial three-element impeller, its efficiency can be increased by 10%; there is also an exhaust turbine device at the other end of the blower main shaft, which not only meets environmental protection requirements, but also achieves the purpose of energy saving . Roots blower has adopted three-lobe Roots blower, which saves energy and reduces noise.

 

In the development of centrifugal compressors, more ternary flow impellers should be used to increase the efficiency of the impeller by an average of 2% to 5%. For example, the three large-flow ternary flow impellers developed by the United States for natural gas pipeline transmission centrifugal compressors, The impeller efficiency can reach 94%~95%; the efficiency level of Japanese single-shaft multi-stage centrifugal compressor has also been further improved, and the adiabatic efficiency of its first-stage large-flow semi-open ternary impeller reaches 94%. Its adjustment method should More use of industrial steam turbines or gas turbines to change the speed to achieve the purpose of energy saving.