Sealing arrangement
AssigneeVoith Paper Patent GmbH
InventorDavid A. Beck
Life of this patent
Estimating the term…
Abstract
A sealing arrangement for closing off an end of a chamber formed between a plurality of rollers of a pressing apparatus, comprises a seal member made of a hard seal material such as carbon fiber material. The seating arrangement is preferably a self-loaded seating arrangement.
Claims37
A sealing arrangement (36) for closing off an end of a chamber formed between a plurality of rollers of a pressing apparatus, wherein said sealing arrangement (36) comprises a seal member (38) made of hard seal material such as carbon fiber material.
The sealing arrangement of any one of the preceding claims, wherein the hard seal member (38) has a seal contact surface that is about 1.02 mm to about 2.54 mm wide.
The sealing arrangement of any one of the preceding claims, wherein said sealing arrangement (36) is a self loaded sealing arrangement.
The sealing arrangement of any one of the preceding claims, wherein said seal piston (42) comprises a seal holder (48) having a seal plate (50) and an outer annular lip (52), and wherein said hard seal member (38) is disposed in the region of said lip (52) and reaches beyond said lip (52) towards the end faces (40) of the rollers.
The sealing arrangement of any one of the preceding claims, wherein said hard seal member (38) is disposed inside of the lip (52) or inserted into the slot, respectively, and abuts against the seal plate (50).
The sealing arrangement of any one of the preceding claims, wherein said seal plate (50) is provided with holes (56) so that the chamber pressure on the side of the seal plate (50) opposite to said hard seal member (38) is equal to the chamber pressure on the side of the seal plate (50) on which side said hard seal member (38) is disposed, and wherein said chamber pressure is higher than the atmospheric pressure surrounding said seal piston (42).
The sealing arrangement of any one of the preceding claims, wherein the surface of the seal plate (50) exposed to said chamber pressure on the side opposite to said hard seal member (38) is greater than the surface of the seal plate (50) exposed to said chamber pressure on the side of the hard seal member (38).
The sealing arrangement of any one of the preceding claims, wherein said seal piston (42) is biased towards said end faces of the rollers by spring means (60).
The sealing arrangement of any one of the preceding claims, wherein the seal contact region (70) of said hard seal member (38) is initially tapered towards said end faces (40) of the rollers to concentrate the initial sealing pressure into a smaller area and therefore to increase the initial seal wear.
The sealing arrangement of any one of the preceding claims, wherein a seal member (58) made of a seal material softer than that of the hard seal member (38) is disposed on the inner surface of said hard seal member (38), with said soft seal member (58) initially reaching beyond said hard seal member (38) towards the end faces (40) of the rollers.
The sealing arrangement of any one of the preceding claims, wherein said soft seal member (58) is biased towards said end faces (40) of the rollers by spring means.
The sealing arrangement of any one of the preceding claims, wherein fluid lubrication, e.g. water, is added to the sealing area.
The sealing arrangement of any one of the preceding claims, wherein the lubricant is injected into the air supply line for the chamber.
The sealing arrangement of any one of the preceding claims, wherein lighting on the inside of the sealing contact area is provided.
The sealing arrangement of any one of the preceding claims, wherein at least one mechanical stop (64) is provided to prevent said seal piston (42) from further advancing to the end faces (40) of the rollers when the wear distance (66) has reached a defined small value.
The sealing arrangement of any one of the preceding claims, wherein said seal piston (42) comprises a portion of non-abrasive material which preferably contacts the end faces (40) of the rollers in a non-critical area when the hard seal member (38) is worn out.
The sealing arrangement of any one of the preceding claims, wherein alarm means are provided to signalize that the hard seal member (38) is worn out and needs replacing.
The sealing arrangement of any one of the preceding claims, wherein said seal holder (48) is made of metal.
The sealing arrangement of any one of the preceding claims, wherein said hard seal member (38) comprises at least one layer of carbon fiber material, the fibers of which are running in a direction perpendicular to the end faces (40) of the rollers, said layer being adhered to the inner side of the lip (52) and the thickness of said layer being preferably about 0.18 mm.
Dependencies are inferred from the claim text.