Improvement and application of BRY air-cooled centrifugal oil pump oil seal structure 1. Introduction Due to the high rotation speed of the pump, the centrifugal oil pump is pulled out from the end cover along the shaft under the action of centrifugal force. The oil leakage phenomenon is very common. The bearing box, the coupling and the surrounding ground are covered with oil, which brings hidden dangers to safety production and causes unnecessary lubricant waste. Improvement and application of BRY air-cooled centrifugal oil pump oil seal structure
1. Introduction Due to the high rotation speed of the pump, the centrifugal oil pump is pulled out from the end cover along the shaft under the action of centrifugal force. The oil leakage phenomenon is very common, causing the bearing box, the coupling and the surrounding ground to be full. Oil pollution brings hidden dangers to safe production, and at the same time causes unnecessary waste of lubricating oil, which seriously pollutes the production environment and affects the upgrading of civilized production and enterprises. If the operator can't find it in time, it may cause damage to the pump. Therefore, it is necessary to improve the crude oil seal structure and develop a new oil seal structure with excellent sealing performance and long service life to replace the crude oil seal.
2. Problems with the original sealing structure Due to the oil level limitation, the lower end of the nut is immersed in the oil pool during operation. The centrifugal oil pump stirs up the lubricating oil, squats down the inner surface of the gland, and drops directly onto the rotating shaft. There is a lot of oil, which is driven by the rotating shaft, and the oil crawls along the shaft. Botaibang enters the gap between the gland and the shaft labyrinth. Because the sealing gap is large and the sealing resistance is small, once the oil enters, it is difficult to get back, so it is continuously pulled out along the shaft. The oil is formed at the end of the shaft, so that the dust ring does not seal, that is, oil leakage occurs.
3. Demonstration of the improvement plan and preliminary selection of the new oil leakage prevention structure should meet the following requirements: First, ensure the tightness of the joint part. At the same time, the structure is compact, the system is simple, the manufacturing and maintenance are convenient, the finished product is low, the work is reliable, and the service life is long. For the main reason for oil leakage, we should improve from the following two aspects to prevent oil leakage.
(1) Reducing the amount of oil immersion The oil immersion depth of the bearing lock nut (the relative distance between the liquid level and the lock nut) is an important factor affecting the amount of oil. Reducing the diameter of the nut can reduce the depth of oil immersion and reduce the oil mixing, thereby reducing the amount of oil falling on the shaft and indirectly reducing the amount of oil leakage.
(2) Improve the structural analysis of the crude oil seal structure centrifugal oil pump. From the perspective of the sealing principle, it can consider filling or blocking, separating, extracting or injecting and flow resistance, reverse transmission, and combinations of these schemes. First of all, for the separation, a mechanical seal can be taken. According to the mechanical sealing performance, the applicable range and the service life, the mechanical seal can be applied, but the mechanical seal has high price, complicated structure, large space required, inconvenient disassembly and assembly, and is not suitable for such a small space structure. Secondly, considering the use of the extraction or injection method, the sealing requirements can be achieved, but the auxiliary device is required, and the structure is complicated, and thus it is not preferable. Considering the method of packing and blocking, due to the long life required, some contact seals such as felt rings, retaining rings, sealing rings, oil seals, etc. are worn in contact with the shaft, have limited life, and are not suitable for high-speed long-cycle operation, and The hoop axis occurs and is therefore excluded. Finally, consider using flow resistance or reverse transmission, or adopt an integrated scheme. Flow resistance is the fluid resistance required to seal using a narrow gap or tortuous path of the seal. The reverse drive uses a seal to cause a back pressure on the leaking fluid, which is partially balanced or fully balanced, and the fluid is reversely fed upstream to achieve the purpose of sealing. It is characterized by no mechanical friction and compact structure. Considering the requirements of small space, long life, low power consumption, simple structure, convenient disassembly, and low price, the flow resistance or reverse transmission and its comprehensive scheme are optimal.
4. Application situation Prior to this, due to the frequent leakage of the original sealing structure, the workload of the post operator is very large. In the inspection every hour, the lubricating oil of the pump must be supplemented, and two oil spills have occurred. The resulting equipment axle hazard caused fluctuations in production. Due to the generality of oil spills, on-site hygiene has been difficult to solve, which has brought difficulties to equipment site management. After the transformation of the centrifugal oil pump, the lubricating oil of the pump does not need to be replenished in a large amount during the oil change interval, which greatly reduces the labor intensity of the workers, the situation on the site is obviously improved, and favorable conditions for the smooth operation of the production are also created.
5. Conclusion The labyrinth seal of the original bearing box gland is changed into the combined sealing structure of centrifugal seal and spiral seal. The centrifugal seal is used as the preliminary throttling leakproof seal. The spiral seal is used as the secondary seal to ensure that there is no shaft head. leakage. This improved method only needs to modify the bearing lock nut and the bearing box gland, and the original structure is changed little, that is, it can meet the sealing requirements, and can adapt to the limitation of the space available for the original structure. The sealing structure is simple, convenient to manufacture and install, and consumes little power. From the actual use effect, the situation caused by the oil pollution caused by the original structure and the surrounding environment is completely improved, the production hazard is eliminated, the labor intensity of the workers is reduced, and the civilized production is promoted.
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