Emergency fire pump of marine diesel engine

Abstract

The invention discloses an emergency fire pump of a marine diesel engine. A diesel engine is in transmission connection with a sliding vane pump through a coupler, and the diesel engine and the sliding vane pump are fixed on the base. The emergency fire pump of the marine diesel engine is simple in structure, has abilities of high suction lift and strong self priming; the working efficiency of the emergency fire pump is improved; the positive displacement pump is internally provided with graphite sliding vanes; lubrication between members in the positive displacement pump is ensured; and the probability of faults is reduced.

Description

technical field [0001] The invention relates to the technical field of marine fire pumps, in particular to a marine diesel engine emergency fire pump. Background technique [0002] The marine mobile diesel engine emergency fire pump is a special water pump. It is powered by a diesel engine and uses the water surface beside the ship string as the water source. At present, the structure of centrifugal pump and vacuum water diversion pump is widely used on board. This structure has the following disadvantages: First, the centrifugal pump itself has no self-priming ability. When starting, it must rely on the vacuum pump to divert water until the pump body is filled with water before it can work normally. There are high requirements for the reliability of the vacuum pump and the proficiency of the operator. Even if the function of the vacuum pump is normal and the operator is relatively skilled, it takes at least 20 seconds from start to water discharge. If the performance of the...

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Problems solved by technology

At present, the structure of centrifugal pump and vacuum water diversion pump is widely used on board. This structure has the following disadvantages: First, the centrifugal pump itself has no self-priming ability. When starting, it must rely on the vacuum pump to divert water until the pump body is filled with water before it can work normally. There are high requirements for the reliability of the vacuum pump and the proficiency of the operator. Even if the function of the vacuum pump is normal and the operator is relatively skilled, it takes at least 20 seconds from start to water discharge. If the performance of the vacuum pump is not good or the operator is not If you are too proficient, the water discharge time will be longer or even unable to discharge water in time; secondly, if the pump is in operation due to the shaking of the ship and the influence of wind and waves, it is likely to cause the suction of the fire pump to be intermittently sucked and cannot work normally, resulting in a prolonged period from start to discharge. Moreover, due to the working nature of the centrifugal pump, the suction pressure is too low to cause cavitation at the inlet of the impeller, resulting in strong vibration and noise, and even unable to absorb water normally. The impeller of the centrifugal pump is damaged early, so the centrifugal pump must reserve NPSH, resulting in insufficient suction height, with an average suction of 5 meters, resulting in great limitations in its use, which also affects the working efficiency of the pump; at the same time, due to Traditional marine fire-fighting pumps include centrifugal pumps, vacuum pumps, and connected piping systems and valves.

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