Double-end-surface mechanical seal

Abstract

The invention provides a double-end-surface mechanical seal. The standard structure of the double-end-surface mechanical seal comprises a positioning packing structure, a double-end-surface sealing structure and a positioning and locking structure. A movable ring (10) rotates along with a shaft sleeve (1) under the action of a shifting fork and can simultaneously slide along an excircle surface of the shaft sleeve front and back (or left and right) in the axial direction, so that the movable ring can be permanently kept in place when the shaft sleeve moves front and back, axial floating of the movable ring is realized and a left end surface clearance and a right end surface clearance formed by the movable ring with a static ring (7) and a compensating ring (12) throughout keep working states. The double-end-surface mechanical seal has the advantages of good sealing effect and wide use range, can realize safe, reliable and long-life operation without using sealing oil or by using little sealing oil, and can simultaneously reduce use costs and maintenance costs of the double-end-surface mechanical seal and bring great social benefits to a user.

Description

technical field [0001] The invention relates to a mechanical seal for a rotating shaft, in particular to a double-face mechanical seal. Background technique [0002] In industrial production, especially in petrochemical production, in order to ensure production safety and protect the ecological environment from pollution damage, for those rotating equipment that transport various fluid media, the use of various mechanical seals is often the first choice, because these well-known The mechanical seal has a good sealing effect and can achieve zero leakage, but it is used to transport those unclean, high-temperature, flammable, explosive, toxic and harmful fluid media, or the working conditions are harsh, that is, intermittent operation, easy to evacuate, and easy to vibrate. In order to use these known mechanical seal structures well on the equipment, it is necessary to add an oil sealing system, so that these known mechanical seals can achieve better results, which not only in...

AI Technical Summary

Problems solved by technology

[0002] In industrial production, especially in petrochemical production, in order to ensure production safety and protect the ecological environment from pollution damage, for those rotating equipment that transport various fluid media, the use of various mechanical seals is often the first choice, because these well-known The mechanical seal has a good sealing effect and can achieve zero leakage, but it is used to transport those unclean, high-temperature, flammable, explosive, toxic and harmful fluid media, or the working conditions are harsh, that is, intermittent operation, easy to evacuate, and easy to vibrate. In order to use these known mechanical seal structures well on the equipment, it is necessary to add an oil sealing system, so that these known mechanical seals can achieve better results, which not only increases the cost of using and maintaining the mechanical seals , and it has not essentially eliminated the known safety hazards that the end faces of mechanical seals are easy to open or the bellows will break, especially on high-temperature oil pumps. If the end face is opened too much, the seal oil will leak too much to the external environment. For a safety accident such as a fire, it is not acceptable to leak too much sealing oil into the equipment. This will not only affect the quality of the product, but also cause the equipment to evacuate and cause fluctuations in the production process, which will affect stable production and cause operational accidents.

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