Liquid purification or separation – With repair or assembling means
Patent
1995-07-25
1997-03-25
Nessler, Cynthia L.
Liquid purification or separation
With repair or assembling means
210460, 210463, 210541, 210172, B01D 3502
Patent
active
056140908
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a filtering pot of a return filter according to the preamble to patent claim 1.
Filtering pots of this type are known from DE-A-24 34 076 or FR-A-2 397 130.
Return filters have been used for a long time for the filtration of hydraulic oils and these filters have a filter head attachable to a tank for hydraulic oil, a filtering pot on one side of the filter head, a detachably arranged cover on the other side and a filter element arranged to pass through the filter head and filtering pot. The hydraulic oil to be filtered passes through the filter element via an opening in the filter head and flows out of an outlet connection projecting from the free end of the filtering pot and back into the tank for hydraulic oil. To prevent the filtered, returning hydraulic oil from exiting out of the filtering pot above the level of hydraulic oil in the tank and thereby causing a disadvantageous formation of foam when impinging on the surface of the oil, an extension pipe is secured to the outlet connection and this allows the filtered hydraulic oil to flow directly into the oil already located in the tank as far as possible beneath the level of the hydraulic oil. In order to be able to use return filters of this type in tanks for hydraulic oil having different shapes and sizes it is necessary to secure extension pipes of different shapes and lengths to the outlet connection arranged on the filtering pot, e.g. by form-locking.
In known extension pipes, a plastic pipe consisting of PVC is, for example, heated, pushed onto the outlet connection of the filtering pot and secured with a conventional hose clip.
In other, known extension pipes, metal pipes are, for example, sealingly connected with the filtering pot by welding or soldering.
The object of the invention is to provide an extension pipe which can be mounted on the fully assembled filter and allows a connection of the extension pipe with an outlet connection of a filtering pot which is tight, secure and easy to handle. In this respect, an extension pipe for a filtering pot made from plastic is, in particular, intended to be created.
The object is accomplished in accordance with the invention by the characterizing features of patent claim 1.
BRIEF DESCRIPTION OF THE DRAWINGS
The following description of a preferred embodiment serves to explain the invention in greater detail in conjunction with the attached drawings. In the drawings:
FIG. 1 is a partially cutaway illustration of a filtering pot with an inventive pipe extension and
FIG. 2 is a sectional illustration along line II--II in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
As illustrated in FIG. 1, an outlet connection 2 is integrally formed on the free end of a filtering pot 1 made from plastic, this free end projecting into the interior, for example, of a tank for hydraulic oil. An annular groove 3 extending in circumferential direction is arranged at the outlet connection 2, adjacent to its free end face. An annular seal 4 known per se is inserted into the annular groove 3; this seal does not protrude radially beyond the outer circumference of the outlet connection 2.
Four radially projecting webs 6 are arranged at the outlet connection 2 in the region between the annular groove 3 and the lower end of the filtering pot 1. These webs extend in axial direction towards the annular groove 3 in a slightly conically tapering shape. The webs 6 are distributed symmetrically over the outer circumferential surface of the outlet connection 2. Instead of the four webs 6 illustrated, only three or more than four, for example, five or six webs can be provided.
For securing the pipe extension, a relatively thin-walled pipe 7 consisting of metal, preferably of aluminum or an aluminum alloy, is pushed over the outlet connection 2. The pipe 7 is thereby expanded at its end pushed over the outlet connection 2 due to the conically ending webs 6 and deformed into an essentially square-shaped form having curved corners (FIG. 2). This deformation prevents any wobbling of the pipe 6 on the connect
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ARGO GmbH fur Fluidtechnik
Nessler Cynthia L.
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