1. An oil seal for preventing oil leakage, said oil seal adapted to fit a shaft, and said oil seal comprising:
an annular casing, having a spindle hole at the center for providing said shaft passing through said annular casing;
a first seal component, mounted on said annular casing;
a second seal component, mounted on said annular casing, for preventing a lubricating oil leaking from said first seal component;
a first seal lip, disposed on first side of said annular casing for preventing said lubricating oil leaking from said first side of said annular casing; and
a second seal lip, disposed on second side of said annular casing, and said second side being opposite to said first side, wherein said second seal lip is for preventing the dust from entering said oil seal.
2. The oil seal of claim 1, wherein said annular casing further comprises:
a first constraint component, extended circularly from said annular casing towards an axial direction of said shaft;
a second constraint component, extended circularly from said annular casing towards said axial direction of the shaft; and
a third constraint component, extended circularly from said annular casing towards said axial direction of the shaft, and said second constraint component located between said first constraint component and said third constraint component;
wherein said first seal component is mounted between said first constraint component and said second constraint component, said second seal component is mounted between said second constraint component and said third constraint component.
3. The oil seal of claim 2, wherein said annular casing further comprises a press edge extended circularly from said second constraint component, and said press edge is used for enhancing the fixing ability for said first seal component or said second seal component.
4. The oil seal of claim 1, wherein said first seal component or said second seal component is made form teflon, polyurethane, polyacrylate, fluorosilicone or materials used for the oil seal.
5. The oil seal of claim 1, wherein said first seal lip or said second seal lip is made from elastic material.
6. The oil seal of claim 1, wherein said first seal lip or second seal encapsulates an outer surface wall of said annular casing
7. The oil seal of claim 1, wherein said first seal lip and second seal lip are integrally formed.
8. The oil seal of claim 1, wherein said first seal lip and said second seal lip can be extended towards to same direction of different directions.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A cyclonic separator for separating particles andor liquids from an airflow comprising:
a separating chamber (12; 112; 212);
an inlet (5; 105; 205) for letting a flow of air (22) entraining particles andor liquids into said separating chamber (12; 112; 212); and
an outlet (6; 106; 206) for letting a flow of air (28), from which at least a portion of the entrained particles andor liquids has been separated, out of the separating chamber (12; 112; 212), the outlet (6; 106; 206) having at least one entry (29; 129; 229);
means for causing the airflow (22, 23, 25-27) to follow a cyclonic flow pattern through the separating chamber (12; 112; 212) and around an axis (17; 117) for causing cyclonic separation of at least a portion of the particles andor liquids from the airflow within the separating chamber (12; 112; 212); and
at least one drum (18; 118; 218) of which at least one interior surface portion extends circumferentially around said axis (17; 117) and bounds said separating chamber (12; 112; 212);
characterized in that said at least one interior surface portion extending circumferentially around said axis (17; 117) is rotatable about said axis (17; 117).
2. A cyclonic separator according to claim 1, wherein the inlet (5; 105; 205) and the outlet (6; 106; 206) enter and leave, respectively, the separating chamber (12; 112; 212) coaxially with the axis (17; 117) of rotation of the drum (18; 118; 218) bounding the separating chamber (12; 112; 212).
3. A cyclonic separator according to claim 2, wherein the inlet (5; 105; 205) and the outlet (6; 106; 206) enter and leave, respectively, the separating chamber (12; 112; 212) at axially opposite ends of the drum (18; 118; 218) bounding the separating chamber (12; 112; 212).
4. A cyclonic separator according to claim 3, wherein an exit opening of the inlet (5) and an entry opening (29) of the outlet (6; 106) face in axially opposite directions, and wherein at least one divider drum (13) situated in, and coaxial with, the separating chamber (12) shields the entry opening (29) of the outlet (6) from the exit opening of the inlet (5).
5. A cyclonic separator according to claim 1, wherein said at least one divider drum (13) has a circumferential wall with radially extending perforations, of which circumferential wall at least one portion is spaced radially outwardly from the at least one entry portion (29) of the outlet (6).
6. A cyclonic separator according to claim 5, wherein the circumferential wall of the divider drum (13) includes an air-grid having at least one portion circumferentially extending around said axis (17).
7. A cyclonic separator according to claim 1, further comprising a plurality of circumferentially distributed blades (20; 120) for imparting tangential velocity to said airflow.
8. A cyclonic separator according to claim 1, wherein said rotatable drum (18; 118; 218) is adapted to rotate at a velocity about equal to the tangential velocity of the cyclonic airflow in the separating chamber (12; 112; 212).
9. A cyclonic separator according to claim 1, including a motorized drive structure (3; 19) for driving the rotation of said rotatable drum (18; 118; 218).
10. A cyclonic separator according to claim 1, wherein the at least one entry portion (129; 229) of said outlet (106; 206) is arranged spaced from an end (237) of the separating chamber (112; 212) opposite an end where the inlet (105; 205) debouches into the separating chamber (212) and facing in a direction having a radially outward component.
11. A cyclonic separator according to claim 1, wherein the at least one entry portion (129; 229) of the outlet (106; 206) is provided with a filter.
12. A cyclonic separator according to claim 11, wherein said filter is rotatable about said axis.
13. A vacuum cleaner having a motor (3), a fan (4) coupled to said motor (3), air guiding conduits (5; 6; 7; 9; 10) and a cyclonic separator (8) having a separating chamber (12; 112; 212) for separating particles andor liquids from an airflow through the air guiding conduits and the separating chamber, which airflow is generated by the motor (3) and the fan (4), characterized in that the cyclonic separator (8) is a cyclonic separator as claimed in claim 1.