Fire pump refers to a special pump installed on fire trucks, fixed fire extinguishing systems or other fire fighting facilities and used to transport liquid fire extinguishing agents such as water or foam solution. It is well known that the core component of the Isuzu fire truck is the fire pump. However, once the fire pump fails, it will not be able to provide the fire truck with the water pressure and water volume required to extinguish the fire, and it will not be possible to carry out fire extinguishing and rescue operations at the best time. It will cause some unnecessary losses, so when the fire pump fails, it must be solved in time. So what are the common failures of fire pumps? How should we deal with these failures? The main working principle of Isuzu fire truck fire pump Fire pumps for fire trucks mainly use centrifugal water pumps. The working principle is that before starting the centrifugal pump, the pump casing and water suction pipe should be filled with the liquid to be transported. When the prime mover drives the pump shaft to rotate, it drives the impeller and water to rotate at high speed. At this time, the water is accelerated by centrifugal force and thrown out of the impeller. It flows into the discharge pipe of the water pump through the flow channel in the scroll pump casing. During this process, part of the kinetic energy of the water is converted into pressure energy. At the same time, a low-pressure area is formed at the center of the water pump impeller because water is thrown out. Under the action of the difference between the liquid surface pressure and the pressure inside the pump, the liquid enters the impeller of the pump through the suction pipe to fill the position of the discharged liquid. As long as the impeller keeps rotating, liquid is continuously sucked in and discharged. ➹ Malfunction problem: What should I do if the fire pump cannot be started? ________________________________________ Approach: 1. First check the power supply: Whether the joint connection is secure; Whether the switch contact is tight; Whether the fuse is blown; Whether the three-phase power supply is equal or not. If there is an open circuit, poor contact, blown fuse, or phase loss, the cause should be identified and repaired in time. 2. Secondly, check whether it is a mechanical failure of the water pump itself. Common reasons are: The packing is too tight or the space between the impeller and the pump body is stuck and blocked by debris; The pump shaft, bearings and leakage reducing ring are rusted; The pump shaft is severely bent, etc. Method of exclusion: Loosen the filler and clear the water diversion channel; Disassemble the pump body to remove debris and rust; Remove the pump shaft and correct it or replace it with a new one. ➹Malfunction problem: The fire pump vibrates seriously ________________________________________ Approach: 1. The fire pump and the motor shaft are not concentric? [The effe...
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