Labyrinth Sealing Device of Marine Auxiliary Blower

Abstract

The invention discloses a labyrinth sealing device of a ship auxiliary blower. The blower comprises an impeller, an impeller casing and a motor shaft. The sealing device is arranged at the periphery of the motor shaft and comprises an impeller seat, a locking disc, a labyrinth sealing part, a step flange, a release pipe and a ball valve, wherein the impeller seat is sleeved at the end at the left side of the motor shaft and is limited by the locking disc arranged at the top end of the motor shaft, the impeller is fixedly connected to the impeller seat, the labyrinth sealing part is tightly sleeved at the periphery of the impeller seat, a plurality of annular sealing teeth which are sequentially arranged at distributed on the inner wall of the labyrinth sealing part, the step flange is fixedly connected to the labyrinth sealing part, the impeller casing is fixedly connected to the step flange, an impeller chamber is formed at the left side of the step flange, a release chamber is formed at the right side of the step flange, the release pipe is connected with the lower part of the step flange, and the ball valve is connected with the lower end of the release pipe. The labyrinth sealing device has the advantages of good sealing performance, safety, reliability, durability and zero negative influence on a host.

Description

technical field [0001] The invention relates to a marine blower device, in particular to a labyrinth sealing device for a marine auxiliary blower, and belongs to the technical field of marine machinery. Background technique [0002] The auxiliary blower is one of the important parts of the air system of the marine main engine. During the operation of the diesel engine, whenever the scavenging pressure drops to 0.55bar (that is, the load drops to about 30%-40%), the auxiliary blower will automatically start to supply the diesel engine. Burn the required air until the scavenging pressure rises to 0.7bar (that is, the load rises to about 40%-50%) and stops automatically. The auxiliary blower is an essential part of the marine diesel engine, and a sealing device is provided between the motor shaft and the flange. see figure 1 , The traditional motor shaft seal of the existing auxiliary blower adopts the form of a skeleton seal ring, and its structure mainly includes the motor,...

AI Technical Summary

Problems solved by technology

[0004] 1. There is only a single first skeleton sealing ring 5 between the impeller chamber A and the discharge chamber B. Due to its very harsh working environment, the first skeleton sealing ring 5 is easily deformed and damaged and affects its sealing performance, resulting in a long service life Very short, according to statistics, 65%-75% of the main engine will have damage to the first skeleton sealing ring 5 within one year of service, and the damage of the first skeleton sealing ring 5 will affect the scavenging pressure of the main engine, thus causing marine Insufficient combustion of the main engine, insufficient power output, so that the speed of the whole machine drops, resulting in the failure of the auxiliary blower to work normally;

[0005] 2. The air permeability of the traditional discharge chamber B is poor. If the first skeleton seal ring 5 is damaged, the high-pressure oil and gas in the impeller chamber A cannot be fully discharged, and the second skeleton seal ring between the motor chamber A and the discharge chamber B will be accelerated. 4 damage, resulting in high-pressure oil and gas fleeing to the motor room A, causing damage to the motor;

[0006] 3. If the skeleton sealing ring is damaged and needs to be replaced, it will be necessary to go through complicated procedures such as slowing down the main engine, stopping the main engine, dismantling the auxiliary blower, disassembling the impeller, taking out the failed skeleton sealing ring, installing a new skeleton sealing ring, and starting the machine to check the sealing condition. , not only consumes a lot of manpower and material resources, but also the ship cannot continue to sail, seriously delaying the shipping plan;

[0007] 4. The space of the traditional discharge chamber B is too small, and there is no certain oil storage space. If the first skeleton sealing ring 5 is damaged, the black oil and gas in the motor room A will be continuously ejected through the discharge chamber B, and the normally open discharge chamber will be released. The area around the hole 6 is sprayed black, polluting the area near the normally open discharge hole 6, and bringing serious visual impact to the crew

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