Types of static rings in mechanical seals
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The static ring is installed on the stationary parts of machinery and equipment such as housings, gland plates, and flanges. Together with the dynamic ring, it forms a sealing surface that prevents leakage of the medium; there are also compensating rings and non-compensating rings. When the compensation mechanism is designed on the moving ring side, once the sealing end face wears out, the stationary ring cannot provide compensation; this is known as a non-compensating stationary ring. Conversely, it is called a compensating stationary ring; when the sealing surface wears out, the stationary ring moves axially under the action of elastic elements to provide compensation. Non-compensating static rings are widely used, all in rotary seals. There are two ways to seal and secure the static ring and the gland: one is the floating type, and the other is the fixed type. There are many different types of structures, and Figures 20 and 21 show some of the more typical ones.
The static ring of a mechanical seal is one of the key components in a sealing system, and it can be divided into various types depending on its structure and function. Here are several typical types of stationary rings for mechanical seals: 1. **Non-compensating stationary ring**: This type of stationary ring cannot automatically compensate for wear; it is usually installed on the stationary components of the mechanical seal, such as the housing, gland, or flange. Due to the lack of a compensation mechanism, it is generally used in conjunction with a compensation device on the moving ring. 2. **Compensating static ring**: It has the capability to move axially to compensate for wear. In this design, the stationary ring can move adaptively under the action of elastic elements to maintain the sealing performance of the contact surface. 3. **Floating static ring**: This type of static ring can make slight adjustments in its position within the chamber, in order to accommodate changes in size caused by installation tolerances or thermal expansion, thus ensuring good sealing performance. 4. **Fixed static ring**: As opposed to the floating type, the fixed static ring remains in its installed position and does not move as working conditions change. This requires extremely high precision from the machine to ensure the quality of the fit between the sealing surfaces. The specific type of static ring to choose usually depends on the specific operating conditions of the machine, including pressure, temperature, properties of the medium, as well as vibration and displacement levels of the equipment. In practical applications, the static ring made of specific materials and with a particular structure may be selected or customized based on the specific operating conditions and design requirements. .