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Single Spring Mechanical Seal And Multi-spring Mechanical Seal Difference And Characteristics?
Apr 09, 2018

Single spring mechanical seal and multi-spring mechanical seal difference and characteristics?

Differences and characteristics of single spring mechanical seals and multi-spring mechanical seals? Principles and structures of mechanical seals!

First, the two major advantages of a single spring in mechanical seals:

1. Permissible mating lengths The axial tolerances can be larger, because for a given change, larger diameter springs require greater axial movement.

2. The single-spring spring section of the mechanical seal has a much heavier section than the multiple springs. If the spring is exposed to an abrasive environment or is easily clogged with solid particles or paint, the single spring has a greater chance of success. Placing the spring outside the liquid to be treated can overcome the blockage, but abrasion may still be present.

Mechanical seal is a pair of or several pairs of end faces that slide perpendicularly to the shaft. Under the action of the fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, the mechanical seal factory is combined with an auxiliary seal to achieve the axis of the leakage. Sealing device.

According to whether they have axial compensation ability, the mechanical seal of the pump is called compensation ring or non-compensated.

   There are four channels A, B, C, and D in the mechanical seal.

   The C and D leak paths are the seals between the stationary ring and the gland, the gland and the housing, respectively, both of which are static seals. The B-channel is the seal between the rotating ring and the shaft. When the end surface is worn out, it can only follow the compensating ring to make a slight movement in the axial direction. It is still a relatively static seal. Therefore, these seal plant leakage channels are relatively easy to plug. The most commonly used static sealing elements are rubber O-rings or PTFE V-rings. As the auxiliary ring for the compensation ring, the rotating ring or the stationary ring, rubber or PTFE or metal bellows with the function of an elastic member is sometimes used. Structure.

The A channel is a dynamic seal in which the end surfaces of the rotating ring and the stationary ring are in sliding contact with each other. It is the main seal in the mechanical seal device and is also the key to determine the mechanical seal performance and life. Therefore, the processing of the sealing end face is very demanding, and at the same time, in order to maintain the necessary lubricating liquid film between the sealing end faces, the pressure per unit area on the cavity end face must be strictly controlled, and the pressure is too large to form a stable lubricating liquid film and accelerate the end face. Wear; pressure is too low, leakage increases. Therefore, in order to obtain a good sealing performance and have a sufficient life, when designing and installing a mechanical seal, it is necessary to ensure that the pressure value per unit area of the end face is in the most appropriate range.

Compared with soft packing seals, mechanical seals have the following advantages: 1 Reliable seal In the long-period operation, the seal state is very stable, and the leakage is very small. According to rough statistics, the leakage is generally only 1/100 of the soft packing seal; 2 long service life in oil, water-based media generally up to 1 to 2 years or more, in chemical media can usually be more than six months; 3 frictional power consumption of mechanical seal friction power is only soft packing seal 10% to 50%.

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Susie Ding


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