Filtering arrangement including a non-reentrant shape
AssigneePall Corporation
InventorsStephen A. Geibel, Scott D. Hopkins, William L. Murphy, John D. Miller
Life of this patent
Estimating the term…
Abstract
The disclosure describes a filter arrangement comprising a fitting and a filter assembly. The filter assembly includes an end tap and the end cap has a wall defining a bore. The fitting and the wall of the bore are fitted to one another by thermal expansion and contraction under elastic stress. At least one of the fitting and the wall of the bore has a non-reentrant shape shaped to resist longitudinal movement on the fitting within the bore and longitudinally secure and seal the filter assembly to the fitting.
Claims62
A filter arrangement comprising a fitting including a portion having a non-reentrant shape and a filter assembly mounted to the fitting, the filter assembly including a filter and an end cap mounted to the filter and having an end cap wall defining a bore, the end cap being expandable to a first size at a first predetermined temperature wherein the bore is large enough to accept the non-reentrant portion of the fitting and being contractible to a second size at a second predetermined temperature wherein the wall of the end cap is sealed tightly about the non-reentrant portion of the fitting.
A filter arrangement comprising:
- a fitting, and
- a filter assembly including an end cap having a wall defining a bore, the fitting and the wall of the bore being fitted by thermal expansion and contraction under elastic stress to one another, wherein at least one of the fitting and the wall have a non-reentrant shape shaped to resist axial movement of the fitting within the bore and axially secure and seal the filter assembly to the fitting.
A filter assembly arrangement comprising, in combination:
- a housing assembly comprising a housing chamber having at least two apertures defining a flow path therethrough, the housing assembly further comprising at least one extension disposed within the housing chamber at one of the apertures, the extension having a non-reentrant shaped portion which extends into the housing chamber and an internal bore through which flow proceeds, the non-reentrant shaped portion of the extension being defined by an outer diameter, and
- a filter assembly comprising a filter material and at least one end cap, the end cap including a substantially annularly shaped bore defined by a wall having an inner diameter, the inner diameter of the bore wall being smaller than the outer diameter of the non-reentrant shaped portion of the extension at ambient temperatures when the non-reentrant shaped portion is not disposed within the end cap bore,
- the filter assembly being disposed within the housing chamber in the flow path, the non-reentrant shaped portion being disposed within the end cap bore during use, the extension and the ends cap being joined to one another by thermal expansion and contraction such that there is an interference between the inner diameter and the outer diameter that induces stress in the end cap, the end cap bore and the non-reentrant shaped portion of the extension being sealed to one another under elastic stress at ambient temperatures so that the end cap bore fits tightly to the non-reentrant shaped portion without the presence of a sealing member.
A filter arrangement comprising:
- a housing assembly including a housing chamber having an aperture and a hollow fitting extending from the aperture into the housing chamber, the hollow fitting having an outer surface with a non-reentrant shape, and
- a filter assembly disposed in the housing chamber and including a filter material and an end cap connected to the filter material, the end cap having a bore with a wall, the wall being sealed tightly about the outer surface of the fitting by an interference fit at ambient temperatures, the end cap and the fitting being joined to one another by thermal expansion and contraction of at least one of the end cap and the fitting.
Dependencies are inferred from the claim text.