Axial Mechanical Seal
In addition, these surfaces are subject to the action of the pressurized fluid contained in the sealed enclosure, and the rotary axis extends into that sealed enclosure.Vibration transmitted from the machine to the seal can cause difficulties, especially in large equipment such as turbines, stern tubes.According to the frequency and amplitude of these vibrations, periodic increases will occur.
The falling off of the sealing surface causes a leak between the sealing surfaces.In extreme cases, this effect can result in very short suction and discharge times in the sealing gap, and high-speed leakage flow and extremely high pressure difference can lead to erosion of the sealing surface and rapid damage to the sealing.These vibrations can be divided into radial and axial motion.
Radial movement leads to radial sliding of the sealing ring and seat ring on each other\'s surface;In most cases, however, these movements are accepted by standard axial mechanical seals.On the other hand, the axial movement produces force in the seal area, which can be divided into mass force and hydraulic force.In order to reduce the mass force, parts that are affected by this force are usually made as lightly as possible.
In addition, by adjusting the load of the spring to urge the surface in contact with each other, the resonance area can be avoided.The hydraulic power is far greater than the mass force, because a large amount of fluid must be displaced and pumped in a very short time interval.Because the above-Mention of regular elevatorsOff, these hydraulic forces can cause the sealing surface to open continuously, because the force in the spring cannot restore the contact of the sealing surface in a short time interval.
This situation leads to constant and very high leakage, eliminating the advantages of flow leakage and high life of axial mechanical seals compared to other types of seals.Therefore, the purpose of the present invention is to provide a seal capable of tolerating vibration without the negative effects described above.Thus, the present invention provides a series of pockets, each of which has an axial mechanical seal and compensation device.
The compensation device consists of an elastic device that contacts the fluid under pressure and yields in the pocket, to accept the fluid displacement caused by the axial movement of the sealing ring and the sealing ring carrier when they are subject to high vibration.From the detailed description given below, the scope of application of the invention will become apparent;However, it should be understood that a detailed description, while indicating the preferred embodiment of the present invention, only the various changes and modifications within the spirit and scope of the invention will become obvious to those who are good at art.Basically, the present invention provides a compensator in an axial mechanical seal housing, which is able to accept displaced fluid without high flow rate and force, and process the fluid according to frequency.