KR20010082293A - Fluid filter with a discharge dome that is fixed to the housing - Google Patents

Abstract

The present invention relates to a fluid filter, such as an oil filter for an internal combustion engine. The filter according to the invention comprises a replaceable filter inset having a ring-shaped cross section surrounding the inner chamber. The outlet for the clarified fluid is connected to the inner chamber. The filter according to the invention also comprises a discharge line for emptying the filter during filter change. A central discharge aid is provided that extends into the inner chamber. The help is arranged to move axially between the filter inset and a first closed position for closing the discharge line and a second release position for releasing the discharge line. According to the invention, the discharge aid is arranged fixedly in the housing and is pushed into its release position when under spring load. The help can be moved to the closed position against spring action by a filter inset inserted into the filter housing.

Description

FILID FILTER WITH A DISCHARGE DOME THAT IS FIXED TO THE HOUSING}

Filters of this type are known from DE-C2-34,09,219.

DE-U1-296,10,290 is known with a spring loaded, discharge valve fixed to the filter housing, which discharge valve is fixed in its closed position by a filter inset, the filter is opened or the filter inset is disassembled. If it is open by spring pressure.

In DE-U1-94,11,212 a filter is known in which the discharge opening is closed by screws.

The invention relates to a filter according to the preamble of claim 1.

1A-1D are a first embodiment of different operating states,

2a, 2b, 3a, 3b are second additional embodiments of different operating states,

4 to 9 each show a further embodiment.

It is an object of the present invention to make such a filter as inexpensive and space-saving as possible.

This object is achieved by a filter having the features of claim 1.

In other words, in the present invention, the discharge dome is not formed as part of a replaceable filter inset, but is fixedly formed in the housing so that the discharge help remains in the filter. This allows for space saving packing for unique filter insets. This is because its overall height is reduced by a closed tone axially connected to the inherent filter media in the filter. The separate drain aid itself has a diameter that is significantly reduced than the filter insets, so that it can be packed away from the filter insets to provide significant savings when provided to the engine manufacturer, or in some cases without the need for a unique secondary packing, By being placed in the inner chamber of the filter inset, it is possible to transport the filter inset, which saves space, material and saves the overall cost.

In particular, the supply of alternatives has an advantage in these prices. Because the drain aid is fixed in the housing and left in the filter, the replacement cost can be reduced in two ways. That is to say, on the one hand it is possible to transport alternative-filter insets, which saves space and cost, and on the other hand the amount of material of the exhaust aid can be saved entirely.

In the filter, the discharge line is opened by withdrawing the filter inset. This is because with the filter inset the drain aid is also pulled out of the filter housing. According to the present invention, when the spring is not loaded, the drain aid is spring-supported and moves to its release position, thereby making the common operation of the filter inset and the drain help almost identical. The spring is compressed when the filter inset is inserted into the filter housing and the cover of the filter housing is closed, and the discharge aid is moved to its closed position.

Further cost savings in the manufacture of the filter according to the invention are preferably achieved by providing a drain valve, as well as forming a drain block, in which the drain aid is provided. This is a known filter bypass valve that bypasses the filter medium and enables fluid flow upon overpressure, or a backflow blocker which prevents oil from flowing back into the crank housing when the engine is stopped and thus prevents the filter housing from emptying. It can be called a valve.

The additional valve function can in particular be controlled by the possibility of axial adjustment of the discharge aid in a very simple and part-saving manner. In this way the drainage aid can be manufactured with very few parts, and the valve function implemented therein can be implemented very inexpensively, for the user, in particular for the automobile manufacturer, to filter different valves provided for each valve function. The assembly step for mounting therein can be reduced.

In this case the cost can be very reduced by including only one valve body which does not work with the discharge aid being delivered and first interacts with the additional sealing face independent of the discharge aid to form an effective valve. In this way the assembly of the valve body can be made in a very simple and inexpensive way, ie for optimal use.

The support aid can be provided inside the filter inset, preferably in a known manner, so that a replaceable filter inset can be made of very little material, and its filter media provided to the continuously installed support help remaining in the filter. Can be. The support aid can preferably be formed as an extension or an axial extension of the discharge aid, so that as few parts as possible have to be manufactured and used, which has a favorable effect on manufacturing cost and assembly. In particular by means of the extension of the discharge aid thus acting, the filter bypass valve can be provided on the side of the valve inset opposite the discharge opening,

If the support aid is formed as an extension of the discharge aid, the support can be preferably formed in two parts in certain cases, thereby ensuring a sufficient support effect of the support aid in this way, so as to ensure a sufficient support effect of the support aid. "In the case of manufacture, always the same basic part, including the exhaust aid, is produced, and only different length parts corresponding to the filter housing and the filter inset are always connected with the same basic part, depending only on the overall height of the different filter housing.

Embodiments of the present invention are described in more detail below with reference to the drawings.

In FIG. 1A, a typical filter provided as an oil filter for an internal combustion engine is indicated by 1. The filter 1 comprises a filter housing 2 and a cover 3 represented as a base, and the replaceable filter inset 4 is clipped to the cover 3 by its upper end plate.

1a shows the operating state of the filter 1 when the engine is running: the oil to be purified according to the arrow is first raised from the bottom through the inlet pipe, then flows through the filter medium of the filter inset 4 and then supports Guided upwards in the interior of the helper 5, finally entering the internal chamber 6 of the filter inset 4 through the opening of the support helper 5 and exiting the central outlet 7 downwards. .

In Fig. 1b the operating state of the filter 1 is shown in reverse. That is, by opening the filter bypass valve 11, the filter medium of the filter inset is bypassed: one gap is formed between the lower end plate 8 of the filter inset 4 and the discharge aid 9. Open. This is because, for example, when the temperature is low, the overpressure of the oil to be flowed reaches a constant value by the very high viscosity of the oil, or by the filter inset 4 clogged as a whole. By this pressure the ejection aid 9 is pressed downward against the action of the spring 10, thereby opening the mentioned gap. The filter bypass valve 11 is thus formed with a seal face 12 of the discharge aid 9, or with a collar 14 formed in the lower end plate 8 of the filter inset 4. The oil reaches the inner chamber 6 without being filtered and reaches the support aid 5 and the outlet 7.

The discharge aid 9 is made of plastic. The evacuation aid comprises a plurality of radially anchored fingers 30 which protrude outwards, which are not only elastic but also inclined inward at their lower outer edges. The discharge aid 9 can thus be inserted into a joint provided in the filter base, which forms the wall of the outlet 7, until the holding finger is relaxed in the undercut 31 of the joint. Although 9 is fixed in the joint pipe, it is supported to move vertically to the height inside the undercut 31.

FIG. 1C shows the operating state of the filter 1 during the so-called “filter change”, but in practice only the filter inset 4 is replaced: the cover 3 has already been partially turned away from the filter housing 2. By means of clip engagement the filter inset 4 is also lifted in accordance with FIG. 1A opposite its operating position, whereby the spring 10 is relaxed. Since the drain aid 9 is lifted high so that the drain seal 16 is no longer adjacent to the filter housing 1 in the sealed state, the oil in the filter housing 2 is discharged in the radial direction ( From outside 9) to the discharge line 15. On the contrary, the short seal 17 is located at the bottom of the discharge line 15 and is still sealed and adjacent to the filter housing 2 so that the oil which is not filtered and still remains in the filter housing does not reach the outlet 7. , The lubrication place of the engine can be reached.

The undercut 31 is a discharge seal when the discharge aid 9 is assembled such that the discharge line 15 passes through the opening of the discharge port 7 and is otherwise inserted into the filter housing 2 while moving axially. Where 17) can be damaged, it is used not only to remove the holding finger 30 but also to prevent sharp edges.

1d shows an unprovided operating state of the filter 1 used without filter insets. Nevertheless, in this case the filter ensures engine operation in as much order as possible: the exhaust aid 9 extends axially long so that it is located in the central thorn or bridge of the cover 3, so that The drain aid is pressurized slightly downwards opposite its filter replacement position shown in FIG. 1C, such that the drain seal 16 is adjacent to the filter housing 2 in a sealed state, and in this way the oil is discharged to the drain line 15. What can be reached is prevented. Rather, the oil is guided to the upper region of the discharge aid 9 through an opening provided for the purified oil, from which it reaches the outlet 7.

2a and 2b show a second embodiment in which the filter inset 4 does not include an inherent support aid. In this operating state, the filter medium of the filter inset 4 is softened by the prevailing pressure and temperature ratio or by the oil supplied fluid, and through the claw 18 to the filter connected with the discharge aid 9. It is provided on a fixed provided support help (5). 2a shows the operating state of the filter 1 when the engine is running, the unfiltered oil enters through the filter inset 4 and then reaches the outlet 7 through the opening of the support aid 5. do.

On the contrary, FIG. 2B shows the operating state by means of the open filter bypass valve 11: Here too, the discharge aid 9 is lowered by the prevailing overpressure in the filter housing 2, so that the oil is introduced into the filter inset 4. Can be raised between the folded portions of) and reach the outlet 7 through the support help 5 without having to pass through the filter media of the filter inset 4. In this embodiment also a spring 10 is provided which presses the discharge aid 9 upwards.

3A and 3B show the third embodiment, and FIG. 3A shows the operating state of the filter 1 when the engine is operated. 3b, on the other hand, is formed on the one hand by the collar 19 on the upper end plate 20 of the filter inset 4 and on the other hand by the sealing surface 21 on the cover 3. The valve 11 is shown. The filter bypass valve 11 is opened by pressurizing the filter inset 4 downward with a prevailing overpressure in the filter 1. A discharge aid 9, which also forms a support aid 5 integrally in the upper region, is pressed downwards against the action of the spring 10 in this operation.

In order to enable the opening of the filter bypass valve 11, continuous operation of the drainage assistance 9 as provided in the embodiments of FIGS. 1-3 is characterized by high wear resistance, typically during cold start of the engine by oil viscosity. Asks for a seal with This is because the drain aid 9 is designed as a part that remains in the filter 1 permanently.

In contrast, FIG. 4 shows a further embodiment of the invention, which can be formed of an inexpensive seal, such as a manually operated O-ring. The function of the filter bypass valve 11 is implemented by a known valve body 22 provided in the upper region of the support aid 5 as in FIGS. 5-7 below. The filter bypass valve 11 can be manufactured very simply because the valve body 22 can be assembled very simply and quickly. This is because the valve body is optimally accessible because it interacts with the sealing surface 23 and the valve seat. The sealing surface is formed in a known manner as a separate part, ie the upper end plate 20 of the filter inset 4, so that an effective valve is produced only when the entire filter 1 is finally assembled, and the individual part If the group is initially assembled, it does not need to be prepared in advance.

The discharge aid 9 of the embodiment of FIG. 4 supports the backflow shutoff valve 24, the backflow shutoff valve comprising a flap valve 25 which is approximately represented, the flap valve being against the action of the spring 26. It is opened by oil flowing from the bottom and prevents oil from flowing back from the inside of the filter housing 2 when the engine stops in the closed position of the valve. 4 shows the operating state of the filter 1 when the engine is operating, with the flap valve 25 open.

The assembling of the backflow shutoff valve 24 is also facilitated and inexpensive as the valve interacts with the sealing surface 27 as a valve seat. Since the sealing surface is independent of the closing aid 9, the optimum usability and accessibility of the flap valve 25 and the spring 26 are ensured during assembly, and the function of the backflow shutoff valve 24 has a drainage aid 9 ) Is caused by the flap valve 25 adjoining the sealing surface 27 provided on the housing side when it is incorporated in the filter housing 2.

In this embodiment of Figure 4 the function of the discharge valve, the filter bypass valve and the backflow shutoff valve is implemented at a high integrated density in the discharge aid, whereby a very simple and quick assembly is very easy for users, in particular engine manufacturers or automobile manufacturers. This is made possible by parts which are complex and pre-assembled. In this embodiment, which includes a separate valve body 22, since the discharge aid 9 does not need to be constantly moving back and forth for its function as a filter bypass valve, a relatively inexpensive seal here is the discharge seal 16 and the short seal. It can be used in the area of (17).

In contrast, FIG. 5 shows a similar embodiment including an inexpensive discharge aid 9 without a backflow shutoff valve.

The embodiment of FIG. 6 corresponds to the embodiment of FIG. 4, and the embodiment of FIG. 7 corresponds to the embodiment of FIG. 5, but here, respectively, an embodiment of two partial discharge aids 9 is provided.

The two partial discharge aids 9 can basically be used in similar filters, which filters can be matched to different engine types, have different filter sizes, and include filter insets with different overall heights for this purpose. Can be. The upper part which forms the support help 5 while matching each such overall height can be formed, whereby different ejection aids 9 with different overall lengths can be produced with simple material and low tool cost.

Finally, FIG. 8 shows an embodiment in which the function of the filter bypass valve is formed by a separate valve body 28, rather than by the discharge aid 9 itself. The overpressure of the interior of the filter housing 2 causes the valve body 28 to be pushed downwards so that the valve body falls from the lower end plate 8 and the unfiltered oil reaches the inner chamber 6, from which It may flow to the outlet (7).

The valve body 28 extends upwards, where it forms a separation tube 29 similar to that shown in the embodiment of FIG. 1. The separation tube 29 allows partial oil in the filter housing 2, in particular the inner chamber 6, to flow into the outlet 7 when the engine is stopped, so that a small minimum amount of oil is always present in the filter 1. Will remain.

The embodiment described so far has been directed to a filter type in which the outlet is always decentralized, ie extending outwardly of the outlet in the radial direction, for example parallel or inclined to the axis, such as the illustrated outlet line 15. In contrast, filters are also known which comprise a so-called central outlet for a particular assembly position. In this case the oil first flows in an inherent flow channel provided inside the cabbage opening, which flow channel is separated by a separating wall and extends around the intrinsic outlet channel, for example coaxially, and then branches from the outlet. The filter comprising a central outlet can also preferably be formed according to the invention.

The embodiment shown in FIG. 9 shows a filter 1 including a central discharge line 15. The discharge aid 9 comprises a plurality of windows 33 separated from one another by a bridge 32 through which the filtered pure oil reaches the outlet 7. The lower end of the discharge aid 9 is closed.

When replacing the filter, in particular when the filter inset 4 is replaced, the cover 3 is lifted. In this case the spring 10 is relaxed, lifting the discharge aid 9 to a position where the lower end of the discharge aid 9 is lifted such that the discharge line 15 is no longer sealed closed. The enclosing rim 35 consists of a plurality of locking hooks 34 which hold the drain aid 9 in the filter housing 2, and the oil passes through the recess between the locking hooks 34. It can flow from (6) to the discharge line 15 via the lower end of the discharge aid 9 laterally.

Claims (10)

As a fluid filter such as an oil filter for an internal combustion engine A replaceable filter inset having a ring-shaped cross section surrounding the inner chamber, The outlet for purified fluid is connected to the inner chamber, A discharge line for emptying the filter when the filter is replaced, A central discharge aid is provided that extends into the inner chamber, A fluid filter arranged to move axially between a first closed position for closing the discharge line and a second release position for releasing the discharge line with the filter inset, The discharge aid 9 is fixedly arranged in the filter housing and is pushed to its release position under spring load and moved to its closing point against the spring action by a filter inset 4 inserted into the filter housing 2. Filter, characterized in that. The method of claim 1, A filter, characterized in that the discharge aid (9) forms a filter bypass valve (11) or is connected with a filter bypass valve (11). The method according to claim 1 or 2, The discharge aid (9) is characterized in that it forms a backflow shutoff valve (24) or is connected with a backflow shutoff valve (24). The method of claim 2 or 3, The filter, characterized in that the open or closed state of the additional valve (11) is controlled by the position of the discharge aid (9) moving axially. The method of claim 2 or 3, And the further valve comprises a valve body (22, 25) which interacts with a sealing surface (23, 27) provided independently of the discharge aid (9). The method according to any one of claims 1 to 5, Filter, characterized in that the discharge help (9) extends into the inner chamber (6), forming a support help (5) for the filter inset (4). The method of claim 6, Filter, characterized in that the discharge aid (9) is formed in two parts comprising two parts arranged one after another in the axial direction thereof. The method according to any one of claims 1 to 7, Filter, characterized in that the filter inset (4) is connected directly to the discharge aid (9) without a separate sealing part. The method according to any one of claims 1 to 8, A separation tube 29 is provided in the inner chamber 6 including an upper inlet opening for pure fluid and a lower outlet opening connected to the outlet 7, wherein the lower region of the separation tube 29 is purified fluid and / or A filter, characterized in that it is connected to the wall of the outlet (7) in a fluid sealed manner to prevent the flow of crude fluid. The method according to any one of claims 1 to 9, Filter, characterized in that the outlet (9) is laterally connected to the discharge help (9), the discharge line (15) is connected to the discharge help (9) in the axial direction.