DE8707478U1 - Filter cartridge - Google Patents

Description

PATENT ATTORNEYS ,^ ^! ' !J ^i ' IJ | ^>#

DIPL-ING. BODO TMIELKING

&Ggr;-&Mgr;&Ggr;-.&Igr; ,Mpm-roeiDrh-rtLiArKi TELEPHONE: (0521) 60621 * 63313

DIPL- ING. OTTO ELBERTZHAGbN _{TELEX: 9320S9 anwltd}

POSTAL CHECK ACCOUNT: MAN 3Ö9193-302

LAW FILE: 3277
oatuM:21 May 1987 Ro

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Anmeiderini Company Paul Rippert, Am Hane-

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Description: Filter cartridge

The invention relates to a filter cartridge |

in the form of a hollow cylinder, the shell of which is ;_

a filter medium is formed and which at its |

one end face a first inlet or outlet opening I and on the opposite end face at least in the
Area of the filter medium has a closed front wall

For filter cartridges designed for wet and |

Dry filtration is generally used, |

only the outer filter surface is available as an active filter surface |

termantel available. The interior of this f

Filter cartridges are unused, it is also not ^

for the flow to the inside of the filter manifold \

with the medium to be cleaned completely
Also for the deactivation of the particles to be filtered out, it is not necessary to
It is important to provide a storage space inside the filter cartridge, as the particles usually accumulate in the form of a coating on the inside of the outer

3277 - 2 - 21,05,1987

Discontinue filter cartridges* There is therefore no reason to use the interior of the filter cartridges mentioned above in order to increase the active filter area.

The invention is therefore based on the object of creating a filter cartridge of the type mentioned at the beginning, in which a further active filter surface is available in addition to the outer filter casing without increasing the total volume of the filter cartridge and thus without requiring additional space.

This object is achieved in a generic filter cartridge according to the invention in that an inner casing made of the filter medium is arranged coaxially to the outer filter casing inside the cartridge, which inner casing has a closed base on its front side facing the first opening and a second inlet or outlet opening open to the outside on the opposite front side.

The particular advantage of a filter cartridge according to the invention is that the inner casing significantly increases the active filter surface, with a sufficiently large annular space being available between the outer filter casing and the inner casing to allow the flow of the raw medium to be cleaned to the outer filter casing from the inside and the inner casing from the outside. In principle, the flow to the outer casing can also come from the outside and the flow to the inner casing from the inside, the opening on the open front side of the outer casing then forms the outlet opening for the clean medium and the open front side of the inner casing forms the inlet opening for the raw medium. -2a

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3277 -2a- 21.05.1987

In the first case, the filtered clean medium appears on the outside of the outer filter casing and on the inside

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- 3 - ······· ' ₃₂₇₇ 21.05.1987

of the inner jacket, whereby in the latter case the clean medium is guided in an axial direction towards the outlet opening of the inner jacket. The outlet opening of the inner jacket, which is small in relation to the total outlet area of the outer filter jacket, does not affect the throughput of the clean medium, since the capacity of the inner jacket is already limited due to the smaller diameter compared to the outer jacket.

In order to make optimal use of the inner casing, it is advisable to make it the same length as the outer filter casing. If the two front sides of the outer filter casing and the inner casing are at approximately the same height when viewed in the axial direction, the inlet opening forms a ring around the bottom of the inner casing. It is therefore advantageous to provide the filter cartridge with a holder on the ring-shaped front side of the outer filter casing, for example in the form of a profile ring, in order not to narrow the inlet opening. If necessary, the bottom of the inner casing can also be set back slightly compared to the holder on the outer filter casing.

If the outlet opening of the inner casing and the front wall of the outer filter casing are in one plane, the front wall can advantageously be made ring-shaped at the end closed to the outer filter casing and thus aligned with the front wall.

- 4 - 3277 21.05.1987

surfaces of the outer filter casing and the inner casing so that it is at least largely flush with the outside of the outer filter casing and the inside of the inner casing. The central opening in the front wall then forms the outlet opening of the inner casing.

In order to ensure that the inner casing provides a noticeably usable additional filter surface, it is advantageous to make the diameter of the inner casing at least half as large as that of the outer filter casing. The inner casing, like the outer filter casing, is also expediently shaped like a hollow cylinder.

The invention is explained in more detail below with reference to an embodiment example in the drawing.

The drawing shows a cut-open filter cartridge in perspective, viewed diagonally from above.

The filter cartridge has an outer filter casing 1, which consists of a filter medium, which is, for example, a star-shaped folded filter paper. The filter casing 1 forms the casing of a hollow cylindrical body, so that the external dimensions of the filter cartridge depend solely on its dimensions. With its lower, ring-shaped side, the outer filter casing i is divided into a front

5 -

- 5 - 3277 21.05.2987

filring 2 is inserted, which on the one hand supports the filter medium and on the other hand forms the holder of the filter cartridge for connection to a feed nozzle/a feed line or the like for the raw medium to be filtered.

Coaxially to the outer filter casing 1, an inner casing 3, which is also hollow and cylindrical, is arranged inside the filter cartridge and is generally made of the same filter medium as the outer filter casing 1. The inner casing 3 essentially has the same length as the outer filter casing 1, at least the upper end face of the inner casing 3 is in the same plane as that of the outer filter casing 1. The inner casing 3 is closed on its underside by a flush base 4, and an annular gap-shaped inlet opening 5 extends in a ring around the base 4 towards the ring profile 2. For flow-related reasons, it can be advantageous to set the base 4 of the inner casing 3 back slightly inwards compared to the plane spanned by the profile ring 2.

On the top of the filter cartridge, the annular gap between the outer filter casing 1 and the inner casing 3 is closed by an end wall 6, which is essentially flush with the outside of the outer filter casing 1 and the inside of the inner casing 3. The inner opening 7 of the annular «

shaped front wall 6 forms the outlet opening

_ 6 - 3277 21.05.1987

for the inner jacket 3 or for the clean medium exiting on the inside of the inner jacket 3.

Unlike in the embodiment shown, the inflow side can also be swapped with the outflow side, so that the inner opening of the annular end wall 6 forms an inlet opening and the entire outer surface of the casing 1 is available as an inflow surface. Accordingly, the filtered clean medium is then drawn off through the bottom opening 5, which accordingly forms an outlet opening.

Claims (5)

PATENT ATTORNEYS · · ··■·.* '·.·,„,· ·.,' . gadderbaumerstrasse DIPL-ING. BODO THIELKING _{A &Lgr;} ___ _&Lgr; _, „,_,_,_,_,„ _1A ^ — _K1 PHONE: (05 21)606 214-63313 DIPL.- ING. OTTO ELBEPTZHAGEN _{TELEX: 932059} ^ ₀ POSTAL CHECK ACCOUNT: HAN 3091 93-302 ATTORNEY FILE: 3277 date: 21.05.1987 E/Sg Expectations: 1. Filter cartridge in the form of a hollow cylinder, the casing of which is formed by a filter medium and which has a first inlet or outlet opening on one end face and a j opposite end face at least in area of the filter medium has a closed front wall, characterized in that an inner casing (3) made of the filter medium is arranged coaxially to the outer filter casing (1) in the interior of the cartridge, which has a closed base (4) on its end face facing the first opening (5) and on the opposite end face a second inlet or outlet opening (7) open to the outside. 2. Filter cartridge according to claim 1, characterized in that the outer filter casing (1) and the inner casing (3) are approximately the same length. 3. Filter cartridge according to claim 2, characterized in that the first opening (5) is formed radially around the bottom (4) of the inner casing (3) in an annular manner. · · U - 2 - 21.05.1987 4. Filter cartridge according to claim 2 or 3, characterized in that the second opening (7) of the inner casing (3) and the end wall (6) of the outer filter casing (1) lie in one plane / wherein the end wall (6) is annular and its central opening forms the second inlet or outlet opening (7) of the inner casing (3). 5. Filter cartridge according to one of claims 1 to 4, characterized in that the diameter of the inner casing (3) is at least half as large as that of the outer filter casing (1). 14 tt ItIIt II 1 I t · I * · I1*4 · · III I I ·