Pipe joints or couplings – Packed – Flanged pipe
Patent
1986-04-07
1987-06-09
Scanlan, Jr., Richard J.
Pipe joints or couplings
Packed
Flanged pipe
285347, 285342, 285918, 411542, 277190, 277193, 277198, 220327, F16L 2302
Patent
active
046715460
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a means for sealing a bolt hole in a fluid containing assembly.
There are many applications in industry where a bolted connection has to be effected between two parts and where this connection has to be sealed. One, for instance, is in the large diameter (typically 8 to 20 foot diameter) pressure vessel used as a dryer in paper-making installations, known within the paper trade as "Yankee Dryers" or 'M. G. Cylinders". In such arrangements steam is introduced under pressure into the drying cylinder as a heat source whilst condensate is drawn out. Wet paper contacting the hot outside surface of the cylinder has some of its water content evaporated by the dryer. All such dryers, and other similar types of apparatus, suffer from the problem of steam leaking from the holes accommodating securing bolts used in assembling the dryer. For example, a pressure vessel such as the dryer of a paper-making machine installation has bolts passing through holes from the inside of a fluid chamber to the outside in order to secure a head to a shell of the dryer. Even if a gasket is used in the joint between the head and the shell, a lead can occur through the bolt hole.
In the past, the through hole has been sealed by the provision of an internal gasket locted around the bolt shank and disposed between the bolt head or nut and the shell i.e. within the pressure vessel.
Such an arrangement suffers from the disadvantage that if the sealant forming the gasket between the head and the shell should deteriorate, fluid could enter the bolt hole and leak out even through the gasket under the bolt head were intact.
It is an aim of the present invention to solve the aforementioned problem.
According to the present invention there is provided a fluid containing assembly having a through hole passing between the exterior and the interior of the assembly, securing means received in said hole to secure together parts of the assembly, and hole sealing means to prevent fluid leakage out of the assembly from said hole, wherein said hole sealing means is disposed externally of the assembly, surrounding and in abutment with the exterior opening of said hole and in abutment with a shank of said securing means.
According to one embodiment of the invention the hole sealing means comprises an annular seal member which is received in an annular carrier member. The annular carrier member has parallel opposite end faces and an internal bore, the internal bore being counterbored from one end face to define a recess receiving said annular seal member. Preferably, the annular seal member comprises an O-ring seal. Preferably, the recess is defined by a conical surface and more preferably, the conical surface is bounded by the internal bore and the said one end face.
The conical surface preferably has an apex angle of substantially 90.degree..
In use, the annular seal member contacts the conical surface of the annular carrier member and is urged into contact with the shank of the securing means and the exterior face of the assembly. The said one end face of the annular carrier member is also preferably urged into abutment with said exterior face of the assembly outwardly of the seal member. The dimension of the annular seal member in cross-section is such that it cannot be freely received within the recess in the annular carrier member, i.e. distortion is necessary, and this distortion ensures abutment with the shank and the exterior of the assembly.
Preferably, the securing means comprises a nut and a bolt, with the head of the bolt located internally, and the nut located externally. The annular carrier member is received under the nut and serves as a washer. The bolt and annular carrier member are so dimensioned that the annular seal member seats on the shank portion of the bolt. Preferably, the internal diameter of the annular seal member is slightly larger than the external diameter of the bolt threads to avoid damage to the seal on fitting over the threaded section of the bolt.
It will be apprecited that t
REFERENCES:
patent: 2353549 (1944-07-01), Dalzell et al.
patent: 2394097 (1946-02-01), Parker
patent: 2752814 (1956-07-01), Iaia
patent: 3043470 (1962-07-01), Puxkanol
patent: 4056144 (1977-11-01), Wellstein
Archer David J.
Beloit Corp.
Campbell Raymond W.
Scanlan, Jr. Richard J.
Veneman Dirk J.
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