The non-contact seal of bearing and seal

Plus seal is divided into non-contact and contact. The author mainly explain the today is with seal of the non-contact seal. Non-contact seal is seal and its relative motion parts don't contact, and there is proper clearance seal. This form of seal, almost do not produce friction heat in the work, no wear and tear, especially suitable for high speed and high temperature occasion. Commonly used non-contact seal clearance, all kinds of different structure forms, such as type labyrinth and washer respectively applied in different situations. Non-contact seal clearance is better to as small as possible. Below is the most commonly used the groove, labyrinth and large capacity small devices that use the 'oil baffle plate' ( Also known as 'dumping tray') Assembly section. The groove in the most widely used in small mechanical, as shown in figure a. Running, the groove will be full of grease, to prevent dust and moisture from entering the bearing, at the same time can have the effect of discharge excess grease in the bearing. In general, the width of the groove is 3 ~ 5 mm, depth is 4 ~ 5 mm. Labyrinth structure is relatively complex, divided into two kinds of radial and axial, figure b shows the axial type. The structure of sealing effect is stronger than the groove. Alpha and figure b clearance b, according to the size of the diameter of axle D to determine the size of the D& lt; 50 mm, alpha = 0. 25 ~ 0. 4毫米,b = 1 ~ 2毫米; D 50 ~ 200 mm, or alpha = 0. 5 ~ 1. 5mm，b=2～5mm。 Figure given c is 'oil baffle plate assembly section. 'Oil baffle plate installed in the bearing rollers of indoor, along with the axis of rotation. Its role on the one hand, will only make the bearing of the excess or 'failure' from the edge crack grease ( Left) A; On the other hand is to prevent external dust and thrown in the use of waste cooking oil bearing.