The role of the sealing device

Date:14-12-2019
Abstract:

Maintaining the tightness of the system is a prerequisi […]

Maintaining the tightness of the system is a prerequisite for ensuring that the system works. Therefore, the sealing device must always be guaranteed to have a good seal within the working pressure of the system and the temperature range that may be encountered.

Type of sealing device
According to different working conditions, the sealing devices used in hydraulic systems and air-conditioning systems can generally be divided into two types of seals: one is a dynamic seal device, and the other is a static seal device. The relative movement between the two sealed components is called a dynamic seal. Such as the hydraulic cylinder, the end cap and the piston, the seal between the output rod and so on. The dynamic sealing device is divided into a rotary seal and a sliding seal. The former is the relative rotation of two sealed components, such as the output shaft of an oil pump and a hydraulic motor, and the latter is the relative sliding of two sealed components. There is no relative movement between the two components being sealed, and its sealing device is called a static seal. Such as fixed joints in hydraulic system and air-conditioning system accessories. This sealing device is sealed by the squeezing action when the sealing surfaces are joined.
According to the form of the sealing device, the rubber rings that are often used can be divided into "O'-shaped seals," "V" -shaped seals, and the like.

Basic requirements for seals:
① It has tight and reliable sealing performance in a certain pressure and temperature range.
② Durable abrasion resistance.
③ The friction resistance is small and the friction factor is stable.
④ The wear speed is slow, and it can compensate automatically to a certain extent.
⑤ Has reliable impact resistance.
⑥ The structure is simple, compact, convenient to load and unload, and the cost is low.
方便 Convenient manufacturing and maintenance, long life, should ensure interchangeability and achieve standardization.
The mechanism or component containing the sealing element is called a sealing device.
Basic requirements of the sealing device: The sealing device requires compact structure, reliable performance, convenient manufacturing and maintenance, and low cost.