Design And Research Of Self-propelled Dual Fan Wind Fire Extinguishing Equipment

Forest is an important part of ecological environment,which is used to reduce soil erosion,improve climate and control environmental pollution.However,the frequent occurrence of forest fires makes the ecological environment face a serious threat.Fire prevention and fire fighting are particularly important.Countries all over the world attach great importance to and support the research of forest fire-fighting equipment.In our country,the relevant equipment for forest fire fighting mainly includes portable wind fire extinguishers and large fire trucks.The former has the advantages of environmental protection and energy saving,but it has high requirements for the physical strength and endurance of fire fighters,and there are certain safety risks.The latter has high efficiency in extinguishing fire,but it causes waste of resources and high production cost in extinguishing medium and low intensity fire.Therefore,in order to reduce the labor intensity of fire fighting personnel and further improve the economy and safety of fire fighting work,it is necessary to design an economic and practical self-propelled double fan wind extinguishing equipment.In this paper,the principle of forest fire fighting was analyzed to determine the final fire-fighting mode of equipment;then,the selection of wind-driven fire-fighting for centrifugal and axial-flow fans was carried out,and the basic theory of centrifugal fans was studied to understand its main components,main performance parameters and basic equations.According to the requirements of the overall structure design of the equipment,the overall structure layout and working principle were determined.In addition,theoretical calculation and overall structural design were carried out for the key parts of the equipment,such as crawler chassis,double air duct regulating mechanism,intermediate transmission structure,complete machine frame and centrifugal fan system.The main technical parameters of the equipment were determined.The geometric structure parameters of impeller and volute of centrifugal fan and shaft power were calculated in detail,and the geometric structure parameters of impeller and volute and shaft power were determined,then the theoretical design of key components of centrifugal fan system was completed.And through MATLAB software,the relevant parameters of impeller geometry were optimized.The key parts of the self-propelled double fan wind extinguishing equipment,the whole frame and the impeller of the centrifugal fan were analyzed by finite element mechanics,including the common static analysis and modal analysis.Through static analysis,the stress and displacement nephogram of key components were obtained to verify the rigidity and strength of the structure.Through the modal analysis,the low-order frequency and mode shape nephogram of the key components were obtained to verify the stability of the structure.Through Fluent software,the internal flow field of the centrifugal fan system was simulated,and the velocity cloud chart of the internal flow field was obtained.After calculation,the mean value of the wind speed at the outlet end of the wind tube and the flow at the outlet of the wind tube were obtained,and compared with the basic requirements of the wind speed and flow of the wind fire extinguishing.The prototype of self-propelled double fan wind fire extinguishing equipment was trial manufactured,and the fire extinguishing functional verification test was carried out.The structure of the air duct was improved to achieve the optimal design of the air duct structure.