High-speed Mechanical Seal In The Operation Of The Problems And Answers

Why follow the nature of high-speed mechanical seal bad

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High-speed mechanical seals ring in addition to doing high-speed rotation, but also there are two campaigns: one to do with the shaft axial displacement. Centrifugal compressor load fluctuations or other reasons why the occurrence of certain axial rotor displacement, the displacement distance of o. 30mm or less, subject to space constraints only destroy bearings. Load fluctuation is irregular, the occurrence of displacement is also irregular. As compensation for the axial displacement of the spring within the spring force as long as enough, there is no effect on the mechanical seals. Ring there is an alternative movement is axial runout. As the ring itself and the installation of the cumulative error of manufacturing precision, ring on a vertical axis error, in the rotation ring face runout will be produced, their frequency and shaft speed equal to the vibration amplitude depends on the moving pendulum Central vertical error. Static ring under the spring force in close contact with the ring, when the shaft speed rotation, the ring axial displacement occurs (including vibration pendulum), static and dynamic ring ring still fit, this movement of static and dynamic ring ring fitting ability, known as the mechanical seals to follow nature. Obviously, put in the ring oscillator under the action turns a static ring must be pushed open a small gap, static ring under the action of the spring force to be fit in time in the ring-side surface, the two frequencies are equal (or "sync"), then follow with good, small leakage. Conversely, if the static loop compensation frequencies lower than the ring oscillator frequency of the pendulum (not simultaneously), the two form a small gap between the amount of leakage increases, are called to follow the Bad.

Why high-speed mechanical seals stationary structure?

Practical application in the structure of high-speed mechanical seals many types of their structures and found one thing in common: all are static structure. Such as the rotating structure, taking into account the high speed centrifugal force will affect the performance of elastic elements, so that more heterogeneous than the pressure. And rotating in rotating parts are more in need of balancing check before installation, more troublesome, if not verification, dynamic balance is not good, will cause large vibrations; other hand, the rotating part of the liquid medium will cause more violently stirred, big power consumption. At the same time, this power consumption in the form of heat out, the next question sealing system of the cooler area is to be increased. For these three reasons, all high-speed mechanical seals stationary structure.

Why high-speed mechanical seals consumes more power?

The power consumption of each mechanical seals have two parts: First, the friction between seal faces power consumption, and the other is the rotating part of the rotation of the liquid mixing power consumption. General mechanical seals because the lower speed, stirring power is very small, often worm-eaten: the nature of the different requirements of mechanical seals in the choice of materials and structures, there are many special considerations. The result that the complex structure of mechanical seals, spare parts and more technically demanding to install, resulting in higher prices. Some non-corrosive and neutral media are not high pressure and temperature conditions of work, also use the same harsh conditions than the mechanical seals are no need. Here are a light simple mechanical seals, which is the Lanzhou Institute of Chemical Machinery years of research the results of scientific and technical personnel. Its structure see Figure 100, which is a built-in, internal flow, rotary, single face, rubber bellows-type sealing drive in the balance. As the rubber bellows as the elastic element, so simple, there are three kinds of rubber bellows effect.

1. Transfer torque. Rubber bellows with a metal clasp at one end secured to the shaft, the other end and ring-solid tight, driven ring rotation;

2. Canceled ring seals, to solve the ring and shaft sealing problems:

3. Replaced the spring, which ensures close fitting mechanical seals faces.

Ring material is ceramic, with a binder bonding together with the rubber bellows. Ceramic ring rectangular cross section, in addition to one end of the ground, the others can not process, this would ensure the mechanical seals have reduced processing volume to lower the cost. Impregnated graphite stationary ring can also be used hot phenolic graphite manufacturing. Static ring with L-type gasket fixed on the stationary ring seat, omit processing and anti-static ring tail reseller, so simple and compact. Friction materials also can choose the nature of working conditions and medium 4F, cast iron or steel. Bellows, rounded waveform, the compression stress distribution is also easily forming curing process.

by: lucy00123

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