DE29915845U1 - Filter with separation tube - Google Patents

Description

Company Ing. Walter Hengst GmbH & Co. KG, Nienkamp 75, 48147 Münster

"Filter with separating tube"
5

The innovation concerns a filter according to the preamble of claim 1.

Such filters are known, for example, from DE 34 09 219 C2.

When changing the filter, i.e. when replacing the filter insert, care must be taken to ensure that a certain amount of unfiltered raw fluid, which always remains in the filter housing, cannot enter the outlet provided for the filtered clean fluid.

For example, if the filter is used as an oil filter for an internal combustion engine, dirt particles could otherwise get into the oil channels and clog them, which could result in significant engine damage.

In the generic filter, the installation position ensures that the outlet for the clean oil is arranged higher than the drain opening through which the unfiltered residual oil remaining in the filter housing can flow away when the filter insert is changed.

The innovation is based on the task of achieving a reliable separation of raw and clean fluid in the most cost-effective way possible and at the same time allowing the greatest possible constructive freedom for the design and arrangement of the filter.

lichen.

This problem underlying the innovation is solved by a filter with the features of claim 1. 35

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In other words, the innovation proposes the use of a separating pipe which is connected to the outlet in a fluid-tight manner and has an inlet opening which is higher than the outlet. In this way, the outlet is extended upwards, so to speak. In the usual operating state of the filter when the

In the engine, cleaned fluid collects around the separator tube until it has reached a level at which it can flow into the inlet opening of the separator tube and from there through its outlet opening into the actual outlet. When changing the filter, i.e. when the filter insert is removed from the filter housing

is removed, the oil remaining in the filter housing, whether it is pure oil that has already passed through the filter medium of the filter insert, or whether it is unfiltered oil, flows through a flow channel that exists between the separating tube and the inner surface of the filter housing, not to the outlet for

the clean oil but to a drain opening through which the oil is not returned to the lubrication points but, for example, to the oil sump. The flow channel is opened or closed by a drain valve, which is arranged around the separating pipe to save space.

The separating pipe provided for in the new version can be designed as a one-piece nozzle formed on the filter housing during series production of new filters, so that no further processing, sealing or assembly measures are required.

men are required in the filter.

Alternatively, especially when revising or converting existing filter concepts, it is possible to replace an existing filter housing with a

separating pipe in order to be able to use the advantages of the innovation. In addition, the separate design of the separating pipe as a component that can be inserted into the filter housing can enable inexpensive and uncomplicated production of both the filter housing and the separating pipe, so that here

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Depending on the structural design of the filter housing, a more cost-effective construction may be achievable despite the required assembly and sealing than with a separating pipe which is intended as a component of the filter housing.

Furthermore, the separating tube can advantageously be designed in two parts over its length, i.e. it can be provided with a first part that connects to the outlet of the filter housing and a second part that determines the final height of the separating tube. In this way, for example, the separating tube can be adapted to different heights of the filter by using different second components. Conversely, differently designed first components can be used to easily and inexpensively adapt to the respective outlets of different filter types, while otherwise a standardized second component of the separating tube is used.

Two examples of the innovation are explained in more detail below using the drawing. The

Fig. 1a and 1b

Fig.2

a first embodiment in different operating states and a second embodiment.

In the drawing, 1 generally designates a filter which is intended, for example, as an oil filter for an internal combustion engine and which has a filter housing 2 and a cover 3 as well as a filter insert 4 arranged in the filter housing 2.

Fig. 1a shows the normal operating state of the filter 1 when the engine is running. Unfiltered "crude oil" flows through an inlet 5 into the filter housing 2 and passes through a pleated filter element into the interior of the filter insert 4. There the filtered

purified oil until it reaches an upper inlet opening 6 of a separating pipe 7. It flows downwards in the separating pipe 7, leaves the separating pipe through an outlet opening 8 and is already in an outlet 9 of the filter housing, where it flows from the outlet 9 to the individual lubrication points

is promoted.

In this operating state, the interior of the filter housing 2 is sealed against a drain opening 10 by means of a seal 11, so that neither crude oil nor pure oil can enter the

Drain opening 10 and a drain valve 16 is formed here, which is in its closed position.

Fig. 1 b shows the operating state of the filter change: The cover 3 is removed from the filter housing 2 and the filter insert 4 is raised compared to the operating position according to Fig. 1a. Oil, which is also located inside the filter housing 2 when the engine is stopped, now passes through a flow path 12 into the drain opening 10, whereby this flow path 12 always extends outside around the separating pipe 7, so

that no oil can get into the separating pipe 7 and thus into the outlet 9.

The filter insert 4 has a lower end plate 14 which is angled downwards and extended to form a drain dome 15 which forms the movable valve body of the drain valve 16. As can be seen from Fig. 1a, this drain valve 16 seals the interior of the filter housing 2 from the drain opening 10 in the normal operating state of the filter 1 by the drain dome 15 and in particular its seal 11 resting against the filter housing 2. When the filter is changed, however, the drain dome 15 is lifted together with the filter element 4. In this way, the drain valve 16 is opened and the flow path 12 is released at a time when the filter insert 4 cannot yet be completely removed from the filter housing 2.

so that premature draining of the filter housing 2

remaining oil is ensured and thus the risk of contamination for the user from dripping oil when changing the filter is minimized.

Fig. 2 shows a second embodiment with a

filter insert 4 designed considerably smaller than in Fig. 1: The lower end disk 14 according to Fig. 2 is designed as a flat, annular disk, while the drain dome 15 is designed as a separate component, which in its upper area also represents a support dome to which the pleated filter element is attached.

element of the filter insert 4. Here too, the valve body of the drain valve 16 is formed by the drain dome 15. The opening of the flow path 12 in this second embodiment can be carried out, for example, by a spring (not shown for reasons of clarity), which

lifts the drain dome 15 as soon as the spring is relieved by unscrewing the cover 3.

Alternatively, the drain dome 15 can be connected to the cover in its upper area, where it forms the support dome.

3 so that - as shown in Fig. 1b - the drain dome 15 is also removed from the filter housing 2 together with the cover 3.

The embodiment according to Fig. 2 enables a filter

filter insert 4 with more compact dimensions than Fig. 1 and reduces the amount of material to be disposed of when changing a filter insert.

Claims (5)

1. Filters, such as oil filters for an internal combustion engine,
with a filter housing,
and with an outlet for purified fluid,
and with a drain opening for emptying the filter housing when changing the filter insert,
marked by
a separating pipe ( 7 ) which extends from the outlet ( 9 ) upwards into the filter housing ( 2 ),
wherein the separating tube ( 7 ) is fluid-tightly connected to the outlet ( 9 ),
and wherein the separating tube ( 7 ) has an inflow opening ( 6 ) for fluid above the lowest point of the interior and an outflow opening ( 8 ) leading to the outlet ( 9 ) below the inflow opening ( 6 )
and wherein outside the separating tube ( 7 ) between the separating tube ( 7 ) and the filter housing ( 2 ) a flow path for the fluid is provided leading from the filter interior to the drain opening ( 10 ),
wherein the flow path can be closed by a drain valve ( 16 ) arranged between the separating tube ( 7 ) and the filter housing ( 2 ). 2. Filter according to claim 1, characterized in that the separating tube ( 7 ) is formed in one piece from the filter housing ( 2 ). 3. Filter according to claim 1, characterized in that the separating tube ( 7 ) is designed as a separate component. 4. Filter according to claim 3, characterized in that the separating tube ( 7 ) can be inserted into the outlet ( 9 ). 5. Filter according to one of the preceding claims, characterized in that the separating tube ( 7 ) is designed in at least two parts over its length.