The DJF-I electric foot pedal dual-purpose fan is a new product jointly developed by our company and Shanghai Jiao Tong University. This fan is an essential equipment for ventilation and protection in civil air defense works and air defense basements during wartime when the power supply is destroyed and the enemy uses atomic, chemical, or bacterial weapons. The focus of its technical indicators is to ensure that the filtering ventilation requirements of a 400 person unit are met under wartime human driven conditions. Considering the combination of peacetime and wartime, power can be used to provide ventilation and air exchange for civil defense works, air defense basements, underground hotels, restaurants, and shopping malls. The appraisal believes that the equipment has high air volume and pressure, and has a relatively advanced level among similar products in China.

Performance of DJF-I electric foot pedal dual-purpose fan

Structural form of DJF-I electric foot pedal dual-purpose fan

The entire equipment consists of two parts: a centrifugal fan and a transmission frame
a、 Fan: The fan mainly includes a snail shell and an impeller. The impeller consists of 12 thin curved blades (backward type), streamlined front plate, flat rear plate, and shaft plate. The impeller has undergone static and dynamic balance verification, and operates smoothly with good aerodynamic performance. It has the advantages of high efficiency, low noise, and low energy consumption. This fan is designed to be left-handed, with a volute outlet wind direction of 90 degrees. If necessary, it can also be made into a right-handed 90 degree structure.
b、 Rack: The rack consists of a gearbox, sprockets, saddles, and handles. See the outline drawing for the structure. The transmission devices are manufactured with high precision to achieve high mechanical efficiency. The conversion between electric and foot pedals is achieved by turning the gear shift handle on the gearbox.

DJF-I type electric foot pedal dual-purpose fan appearance and installation dimensions

Maintenance and upkeep of DJF-I electric foot pedal dual-purpose fan

The common working mode of electric foot pedal dual-purpose fans is electric, and foot pedals can only be used during wartime. But once used, it is a critical situation. To ensure the reliable operation of the fan. So, it is necessary to strengthen maintenance and upkeep, especially for various moving parts. The maintenance work includes the following:
a、 Check for oil leakage in the gearbox and replace the sealing gasket if necessary.
b、 Regularly lubricate the chain, sprocket, and flywheel to prevent rusting.
c、 Check the structure of the bracket for rust, damage, or missing fasteners.
d、 Gearbox maintenance: Open the gearbox cover to check the lubricating oil. If it has deteriorated, pour it out and add new No. 120 engine oil. If the oil level is insufficient, add it to the oil level that is flush with the lower surface of the shaft. Then one person runs slowly and checks for any jamming or impact sounds. If there is no malfunction, then 4 people will run simultaneously for 5 minutes. If there is a malfunction, repair or replace the parts.
e、 If the fan is not used for a long time, remove the belt or loosen the motor base plate to loosen the belt.
The above maintenance work should be carried out every three months (once a month on hot and humid days).