Galvanized negative pressure fan is the most common negative pressure fan in the market, which is made of galvanized iron plate (commonly known as tinplate). Because of its affordable price, many manufacturers choose this kind of negative pressure fan. However, this negative pressure fan has a short service life; Plastic steel negative pressure fan: it is rarely used in the market at present; FRP glass fiber negative pressure fan: FRP is fiber reinforced plastic. Characteristics of FRP: (1) light weight and high strength. (2) Good corrosion resistance. Good tolerance to atmosphere, water, acid, alkali, salt and various oils and solvents with general concentration. (3) Good electrical performance. Excellent insulating material, used to make insulators. And can still protect good dielectric property at high frequency. Good microwave permeability. (4) Good thermal performance. Glass fiber reinforced plastic has low thermal conductivity, is not easy to deform and is fire-resistant.
Due to the above characteristics of FRP, the negative pressure fan made of FRP is resistant to high temperature, acid and alkali, light and stable, and has a longer service life.
Second, transmission mode: the transmission mode of negative pressure fan is divided into direct type and belt type.
From this transmission mode, the transmission mode affects the air volume, noise and maintenance of the fan; Direct optimization;
1. The blades of the direct-discharge negative pressure fan are directly installed on the motor, which reduces the power loss caused by transmission. The air volume of the direct negative pressure fan is about 10% larger than that of the belt fan with the same power. The belt of belt negative pressure fan will loosen after long-term use, and the air volume of the fan will decrease obviously after loosening.
2. There is no noise caused by belt friction in the direct type; To maintain the belt type, the general fan belt can be used for two years (imported) and only for one year, especially the negative pressure fan installed at high altitude is difficult to replace.
3. Motor: The motor is the heart of the negative pressure fan. Belt motors are generally ordinary motors (except for a few manufacturers who match special motors, Litong Ventilation has its own special motors for negative pressure fans); The direct-connected motor is an aluminum-shell motor, and the 12 pole is dust-proof and waterproof above IP55, which is specially used for negative pressure fans.
4. Blades: The blades of the negative pressure fan are made of aluminum alloy, stainless steel, aluminum alloy matte, aluminum-magnesium alloy die casting, nylon, iron and other materials. The material of the blade is different, depending on the place of use. Commonly used blades are aluminum alloy, stainless steel and aluminum alloy sand turning blades. However, Al-Mg alloy die-casting blades are relatively stable and not easy to deform and fracture due to the characteristics of materials. Nylon iron blades are used in acid and alkali places, and electroplating plants are generally corrosive.
Daily maintenance and troubleshooting of negative pressure fan: No matter any product, it needs to be maintained during use, which can prolong the service life of the product and is not prone to failure. Of course, the negative pressure fan with forced ventilation is no exception. Although the quality of Litong ventilator is the first, good things should be properly used and cared for to achieve the best results, and Litong ventilator is no exception.