WO2009037246A1 - Filter - Google Patents

Abstract

The invention relates to a filter (10) for cleaning liquids. The filter (10) comprises a housing having an inlet (19) and an outlet (20), wherein a filter element (22) is disposed between the inlet (19) and the outlet (20). The filter further comprises a bypass valve (26) that opens a bypass flow path upon a prescribed differential pressure being attained between the inlet side and the outlet side. To this end, the bypass valve comprises a valve body (27) and a tensioning means (28), wherein the tension of the tensioning means (28) between the valve body (27) and a counter bearing (29) can be variably adjusted to the required opening pressure.

Description

 description

filter

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

State of the art

There are known filters which ange¬ a housing with a therein

have ordered filter element. The housing consists of a Gehäu¬

setopf and a housing cover, wherein the housing parts sealing mit¬

are connected to each other. The filter element separates an¬ in the housing

ordered inlet seal from one, also angeordne¬ on the housing

outlet. Furthermore, filters have a bypass valve, through

which the liquids to be purified from the inlet to Aus¬

let flow when the differential pressure between the inlet side

gen raw side and the outlet side clean side is too large. Here wer¬

then the liquids are not cleaned by the filter element. Since the

maximum permissible differential pressure to the respective application

must be fitted, this requires specially designed valves,

which differ in their size and / or their individual components

differ. For this a large variety of components has to be stored

to produce appropriately designed valves.

The object of the invention is to provide a filter with a bypass valve be¬

provide, which easy and inexpensive to the respective Anwen¬

Cases is customizable. This object is solved by the features of claim 1.

Disclosure of the invention

The filter according to the invention is for the purification of liquids, insbe¬

special provided by oils or fuels in motor vehicles.

According to the invention, the filter has a bypass valve, which

is arranged such that from a defined differential pressure between

formed on the inlet side and the outlet side, a bypass flow path

will flow through which liquid from the inlet to the outlet

can. This is especially necessary if the filter element

contaminated or the viscosity of the liquid to be cleaned is too high

and too little liquid can pass through the filter element.

The bypass valve has a valve body and a Spannmit¬

tel, wherein the tensioning means between the valve body and an abutment

can be introduced.

The filter has according to an embodiment of the invention via a Ge

housing with one or more inlets and one or more Aus¬

lässen. Inlets and outlets are by a, arranged in the housing

Filter element sealed sealing. The housing is through a pot and ei¬

NEN lid formed, the pot sealingly connected to the lid

is. The pot and the lid are preferably made of a metal

Sheet, which is mechanically deformable. The pot has one

Bottom of the pot and an adjoining the bottom of the pot, preferably lindrisch trained pot wall. In the pot bottom openings are arranged, which are formed as inlets and outlets. The inlets and outlets are punched out of the bottom of the pot after the forming process of the pot or worked out by a machining operation out. The lid is designed as a liquid-tight sheet metal part without openings. By means of suitable forming processes, a prefabricated lid can be produced from a sheet-metal disk, which lid can be sealingly connected to the pot. For this purpose, the lid may preferably be sealingly crimped with the pot. In other embodiments, the inlets and outlets may also be incorporated in the lid. Here then the top floor has neither an inlet nor an outlet for the purified liquid. Of course, however, an opening for the discharge of a separated liquid such. B. water can be provided. The valve body of the bypass valve can be configured arbitrarily, preferably as a ball or disc. The clamping means has elastic properties, wherein the material itself may have the required elastic properties or by the geometric configuration z. B. as spring the required elasticity is achieved. The bias of the clamping means with which the clamping means is arranged between the valve body and the anvil, is adaptable to the required opening differential pressure. At a low opening differential pressure, a low bias voltage of the clamping device is selected, so that a smaller Differential pressure is sufficient to lift the valve body from its valve seat and release the bypass flow path. In other embodiments, the bypass flow path should be released only at higher differential pressures. For this purpose, the clamping means is introduced with a larger bias between the valve body and the anvil. The greater preload can be generated by a changed installation position of the clamping device or by the use of additional components.

In modified mounting positions, the clamping means z. B. conical and come by rotation in a different position on the abutment to the plant.

In other embodiments, additional spacers can be inserted to reduce the distance between the system to the anvil and the valve body.

By the variable adjustment of the biasing force of the clamping means, it is possible to adjust the opening pressure of the bypass valve to the respectively required conditions, without the storage of different clamping means or other valve parts is required. This reduces the variety of components and thus also the storage, whereby costs can be saved.

Another significant advantage of the invention is that done by the adjustable valve a finished or final assembly of the filter and, after the completion of the filter, the opening pressure of the bypass valve can be adjusted or adjusted in a customer-specific or type-specific manner. In the case of exchangeable filters or filter cartridges, this can be adjusted by a simple tool which is moved through the filter cartridge. With this tool, the counter bearing or a setting plate can be locked in the appropriate position.

According to an advantageous embodiment of the invention, the anvil is variably lockable in its axial position. Here, the axial distance between the anvil and the valve body is then changed so that the bias of the clamping means is adapted indirectly to the required properties. Thus, additional components are unnecessary for adjusting the preload force.

In a further development of the invention, the counter bearing is variably lockable in stages. In this case, the steps may be formed as paragraphs in the bypass valve, which with the abutment of the clamping means z. B. cooperate in the form of tongue and groove joints. The arrangement of different stages a targeted adjustment of the opening pressure is possible. Each stage is assigned a special opening pressure and thus easily adjustable. The individual stages are already determined during the development of the filter and can be achieved during installation easily and without special aids exactly. It is advantageous that locking lugs are provided, on which the abutment is lockable. In this case, the abutment is then pressed into the respective position of the latching lugs and thus generates the required for the respective bias axial distance between the anvil and the valve body. In this case, locking lugs are simple and inexpensive to produce geometries, especially in plastic versions.

According to an advantageous embodiment of the invention, the locking lugs are arranged on a support body for the filter element. In this case, the support body can then fulfill the function of supporting the filter element on the one hand and the function of holding the counter bearing on the other hand. Due to the functional integration additional components can be omitted.

In one embodiment of the invention, the support body is connected to an end plate of the filter element. Thus, an exact positioning of the support body is achieved to the filter element. This is particularly advantageous when the bypass valve is at least partially disposed within the filter element. Here, in a particular embodiment of the support body is integral with the end plate, whereby the number of components is reduced.

According to a particular embodiment of the invention, the anvil is formed as a disc. Thus, the anvil can be easily manufactured and mounted in recordings in particular locking lugs. such Slices can be simple and inexpensive z. B. plastic in the spray -

produced casting or punched from thin metal sheets wer¬

the.

In a particular embodiment of the invention, the clamping means

a preferably cylindrical spiral spring, which between the Ventil¬

body and the abutment is arranged. Spiral springs in particular

Spiral compression springs are simple and inexpensive to produce. Farther

Spiral springs are easy to assemble.

According to a particularly advantageous embodiment of the invention is the

Valve body a plastic disc, which in closed Umge¬

Suction valve on a plastic valve seat sealingly rests. This ausge¬

staltung is particularly inexpensive, since the components of Umgehungsven¬

tils can be easily manufactured in plastic injection molding. The art

Valve seat can be molded to the end plate.

Brief description of the drawings

Further details of the invention are described below with reference to the figure

explained. Hereby shows:

1 shows a filter in perspective view in partial section,

Figure 2 shows the items of a bypass valve and

3 shows a bypass valve for insertion into a filter.

Embodiment (s) of the invention

In Figure 1, a filter 10 is a perspective view in partial section darge

provides. The filter 10 has a pot 11 and a lid 12. Der Pot 11, together with the cover 12, forms a housing which essentially represents the external geometry of the filter 10. The pot 11 is connected via a liquid-tight flange 13 with the lid 12. The pot 11 has with its open end in the direction which is closed by the lid 12. The pot 11 has a closed cylindrical peripheral region 14, which merges into a pot bottom 15 in the upper region of the pot 11. In the transition region of the peripheral region to the pot bottom 15, a sealing bead 16 is arranged, on which a seal 17 is plugged or vulcanized is vulcanized. To support the seal 17, an outer ring 18 is provided, which prevents the seal 17 escapes radially outward in the assembled state and thus causes leaks. The outer ring 18 may be welded or glued to the pot 11, whereby it is permanently connected to the pot 11. Of course, there is also the possibility to produce the pot in one piece. In the bottom of the pot 15, a plurality of distributed inlet openings 19 are provided, through which the liquid to be purified can flow into the filter 10. Furthermore, the bottom of the pot 15 has a centrally disposed outlet 20, which has in its interior an internal thread 21 for fastening the filter 10 to an adapter with external thread (not shown). Inside the housing, a filter element 22 is arranged such that the inlet openings 19 are sealingly separated from the outlet. The Fii- For this purpose, the element 22 has a filter medium 23, which in this exemplary embodiment is folded in a zigzag shape and closed in a star shape. At the front ends of the filter medium 23 end plates 24 made of plastic or nitrile rubber are arranged. At the upper end disk 24, a return-blocking diaphragm 25 is sealingly arranged between the outer circumference of the inwardly drawn outlet 20 and the inner diameter of the end disk 24. In the region of the lower end disk 24, a bypass valve 26 is arranged, which protrudes into the interior of the filter element 22. The bypass valve 26 has a disk-shaped valve body 27 and a clamping means 28 which is formed as a spiral compression spring made of wound metal wire. The clamping means 28 is supported on a disc-shaped abutment 29. The counter-bearing 29 is fixed in its axial direction by three locking lugs 30 distributed on the circumference. The locking lugs 30 are arranged on webs 31, which are made in one piece with a support body 32 for the filter element. The support body 32 can be flowed through without appreciable pressure loss for the cleaned fluid. At the webs 31 a further locking lugs 30 'are arranged at defined axial distances, to which the counter-bearing 29 is fixable. The valve body 27 has recesses 33, with which the valve body 27 is guided along the webs 31. Thus, a rotation of the valve body 27 is prevented. Within the webs 31, the support body has via 32 via an annular circumferential valve seat 34, on which the valve body 27 rests sealingly in the closed state.

In the illustrated state, the clamping means 28 is introduced with a small bias between the valve body 27 and the abutment 29, whereby the bypass valve 26 is apparent with a small differential pressure. In an alternative mounting state (not shown), the abutment 29 is fixed to spaced locking lugs 30 ', whereby the biasing force of the clamping means 28 is increased. The bypass valve 26 thus opens only at a higher differential pressure.

For mounting the bypass valve 26, the valve body 27 is first applied to the valve seat 34. Here, the valve body 27 is guided with its recesses 33 along the webs 31. Subsequently, the clamping means 28 is placed on the valve body 27 and pressed against the counter-bearing 29 to the valve body 27. The counter-bearing 29 also has recesses 33, which correspond to the webs 31. During assembly, the abutment 29 is pressed into the locking lugs 30, whereby the webs 31 with the detents 30 arranged thereon spring radially outwards and fix the abutment 29 in the axial and radial directions during spring-back. In order to achieve a greater bias of the tensioning means 28, the abutment 29 is pressed further down until the webs 31 again spring radially outward and the anvil 29 slides under the locking lugs 30 '. After springing back ge 31, the abutment 29 is fixed to the locking lugs 30 ', whereby the distance between the abutment 29 and the valve body 27 is shortened and the clamping means 28 has a greater bias. Thus, the opening pressure is greater than in the installation position shown by the figure. The distances, number and arrangement of the locking lugs 30 is dependent on the bias to be achieved. Of course, more or less than three stages can be provided here.

FIG. 2 shows the individual parts of a bypass valve. On a valve plate 41, three webs 38, 39, 40 are arranged. These webs each have a micro-toothing. Within the webs, a valve plate 36 is inserted, which can close the opening of the valve plate 41. The valve disk is in contact with a compression spring 35. This is closed on its side opposite the valve disk with an adjustment plate 37. The adjustment plate has three guides for the webs 38, 39, 40. The webs are pushed through the guides. A corresponding detent mechanism within the guides ensures that the adjustment plate is only downwardly, i. can be moved in the direction of the valve plate, but is no longer removable. This valve is inserted in a filter element.

Figure 3 shows the assembled valve, which can be connected via the valve plate 41 with the end plate of a filter element. After installation in the filter element, the opening pressure for the surrounding By adjusting the adjusting plate in the direction of the

Adjust valve disc 36.

Claims

claims 1. Filter, in particular for lubricating oil of an internal combustion engine with a bypass valve, which forms a bypass flow path between the inlet side and the outlet side of the filter from a defined differential pressure, wherein the bypass valve has a valve body and a clamping means, characterized in that the clamping means zw is the valve body and an abutment can be introduced, wherein the bias of the clamping means between the valve body and the anvil is adaptable. 2. Filter according to claim 1, characterized in that the counter bearing is variably lockable in its axial position. 3. Filter according to one of claims 1 or 2, characterized in that latching noses are provided, on which the abutment is lockable. 4. Filter according to claim 3, characterized in that the latching lugs are arranged on a support body. 5. Filter according to claim 4, characterized in that the supporting body is connected to an end plate of the filter element. 6. Filter according to one of the preceding claims, characterized in that a housing is provided, wherein the housing has an inlet and an outlet and the filter element separates the inlet of the outlet. 7. Filter according to one of the preceding claims, characterized in that the counter-bearing is formed as a disc. 8. Filter according to one of the preceding claims, characterized in that the clamping means is a coil spring, which is arranged between the valve body and the anvil. 9. Filter according to claim 1, characterized in that a compression spring (35) is designed as a clamping means and between the valve disc (36) and an adjusting plate (37) is clamped, wherein the adjusting plate on at least three webs (38, 39, 49), in particular via a micro-toothing, can be locked and adjusted. 10. Filter according to claim 8, characterized in that the webs (38, 39, 40) are attached to a valve plate (41) and this valve plate is connected to the end plate (24) or forms the end plate. 11. Filter according to one of the preceding claims, characterized in that an adjustment of the valve opening pressure after the final assembly or final assembly of the filter takes place. 12. Filter according to one of the preceding claims, characterized in that the valve body is a plastic disc which sealingly rests on a plastic valve seat when the bypass valve is closed.