Liquid purification or separation – Flow – fluid pressure or material level – responsive – Vent control
Patent
1991-05-07
1992-05-19
Dawson, Robert A.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Vent control
210148, 210440, 210444, 210450, 210472, 2104935, 2105021, 210DIG17, 55500, 55502, 55504, 55521, B01D 2708
Patent
active
051145723
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a filter assembly and to a filter cartridge adapted to form part of such an assembly.
It is well known in the gas and liquid filtration art to provide a filter housing in the form of a filter bowl and a filter head and to provide a separate consumable filter cartridge for fitting into the bowl. For assembling the filter, the cartridge is conventionally attached first to the filter head, followed by the filter bowl. But this conventional method of assembly is wasteful of space because the filter bowl has to be slid axially over the cartridge before it can engage the filter head, subsequent removal requiring the reverse procedure. A free space has to be provided beneath the filter head whose length equals the sum of the lengths of the the cartridge and the filter bowl. Where compactness is desired, or where the filter assembly forms part of a crowded installation, this waste space can be a disadvantage.
It is therefore an object of the invention to provide an assembly of filter bowl, cartridge and head in which the filter bowl can be removed within a "freeboard" which is only a part, and preferably only a minor part, of the length of the filter cartridge.
Broadly stated the invention provides an assembly of a filter cartridge, bowl and head wherein the bowl and cartridge are removable together from the head in a non-axial direction once the bowl has descended a short distance from the head.
In a further aspect the invention provides a filter assembly comprising a filter head, a filter bowl mountable to the filter head and a filter cartridge that fits in the bowl and connects to a fluid flow port in the filter head, wherein means establishes a mechanical connection between the filter bowl and the filter cartridge so that the filter bowl and the filter cartridge are together mountable to and demountable from the filter head.
Conveniently, the filter cartridge and the filter head fit together by a spigot and socket connection which may be fluid-tightly sealed by means of at least one O-ring seal. The advantage of this spigot and socket connection is that the cartridge is mounted to the filter head simply by pushing and is demounted from the filter head simply by pulling. With this arrangement the filter cartridge and bowl can be installed and removed with a "freeboard" which need only be equal to or slightly greater than the length of a neck or spigot of the filter cartridge. The spigot is preferably part of the cartridge as indicated above and the socket is preferably a vertical port in the filter head, but the spigot could also depend from the filter head and fit into a socket in the cartridge.
In a preferred arrangement, the spigot and socket are sealed by a pair of axially spaced seals between which is defined a space fluid-tightly isolated from the filter bowl or the filter head, and a port opens into this space the pressure or flow through the port depending on and providing an indication of the presence or absence of a cartridge in the bowl.
The top inner face of the bowl may have seat means on which a projection of the cartridge fits, and may also have internal buttresses, the cartridge projection being shaped to pass the buttresses in one angular position and to be trapped beneath the buttresses in other angular positions.
The filter head and the filter bowl advantageously have bayonet formations for connecting them together, rotation of the bowl from its unengaged position causing the bayonet formations to cam the bowl gradually upwards towards the filter head, the same small axial movement engaging the cartridge fully home in the filter head. Conveniently there are four bayonet connections disposed at 90.degree. intervals about the filter bowl, a male part of the bayonet formations including shallow ramps leading to level faces defining the intended working axial relative position of the filter bowl and the filter head.
The filter bowl may carry a pressure relief valve and latch means that snaps into a recess in the filter head at one angular position at which the bayonet co
REFERENCES:
patent: 4331535 (1982-05-01), Pett
patent: 4764275 (1988-08-01), Roluichaud
patent: 4886599 (1989-12-01), Bachnann et al.
patent: 4949141 (1990-09-01), Anderson
patent: 4989636 (1991-02-01), Hunter et al.
patent: 4992166 (1991-02-01), Lousiky et al.
Hawker Michael J.
Hunter George S.
Dawson Robert A.
Millard Wanda L.
Process Scientific Innovations Limited
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