CN106943783B

CN106943783B - Filter module

Info

Publication number: CN106943783B
Application number: CN201610918708.4A
Authority: CN
Inventors: M.卡斯特霍恩洛佩斯; J.L.阿里亚斯阿里亚斯
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2015-10-22
Filing date: 2016-10-21
Publication date: 2021-01-29
Anticipated expiration: 2036-10-21
Also published as: CN106943783A; DE102015220686B4; DE102015220686A1

Abstract

The invention relates to a filter module (1) for filtering a fluid, wherein the filter module (1) has an unfiltered side (2) through which the fluid can be fed in and a filtered side (3) through which the fluid can be discharged, wherein a filter element (4) is arranged between the unfiltered side (2) and the filtered side (3), wherein a cover element (9) having a fluid passage (21) is arranged between the filtered side (3) and the filter element (4), wherein the cover element (9) has a bypass (5) which connects the unfiltered side (2) and the filtered side (3) in order to bypass the filter element (4), wherein a first non-return valve (6) blocks a fluid flow through the fluid passage (21) from the filtered side to the filter element (4), and wherein the second check valve (7) blocks fluid flow through the bypass (5) from the unfiltered side portion (2) towards the filtered side portion (3).

Description

Filter module

Technical Field

The present invention relates to a filter module. Such a filter module can be inserted in particular into a filter housing, wherein the filter housing is traversed by a fluid. The fluid can be filtered using the filter module.

Background

Filter modules are known from the prior art. These filter modules are employed when the system being supplied with the working fluid reacts sensitively to contamination of the working fluid. Such contamination can be avoided by the filter module. Filter modules for cleaning fuel are known, for example, from EP O899452B 1.

Systems are known which, in the state of rest or in other states, should not be filled with the working fluid. In this case, the pump must change pump direction in order to remove the working fluid from the system again. However, this results in the working fluid flowing through the filter module in the return flow and thereby removing the filtered particles from the filter module. The dislodged particles can then reach the pump and damage the pump.

Disclosure of Invention

The filter module according to the invention advantageously allows a return flow of the fluid, while filtered-out particles, which in particular adhere to the filter elements of the filter module, cannot reach the pump.

In addition, a filter module for filtering a fluid according to the present invention has a filter element and a bypass portion. The filter module also has an unfiltered side through which fluid can be input and a filtered side through which fluid can be output after it has passed through the filter module. The filter element is disposed between the unfiltered side and the filtered side. The bypass serves to bypass the filter element, so that in particular a connection exists between the filtered side and the unfiltered side, without the fluid having to flow through the filter element. There is a cover element between the filtered side and the filter element. The cover element has a bypass and a fluid passage, by means of which filtered fluid can be conducted from the filter element to the filtered side. Finally, it is provided that the filter module has a first check valve and a second check valve. Fluid flow through the fluid feed-through from the filtered side to the filter element is blocked by means of a first check valve. Fluid flow through the bypass from the unfiltered side portion to the filtered side portion is blocked with a second check valve.

The filter module thus advantageously has two operating modes.

In a normal operating mode (first mode), fluid can be supplied via the unfiltered side, wherein the fluid is guided through the filter element and is discharged via the fluid passage of the cover element via the filtered side. In this mode, the first check valve is non-functional, while the second check valve blocks fluid flow through the bypass.

In the return mode (second mode) of the filter module, fluid flows from the filtered side to the unfiltered side through the bypass. Hereby is achieved that the system (to which the fluid is supplied) can be emptied by said fluid, wherein the first check valve prevents that the returning fluid can reach the filter element, so that the returning fluid cannot release particles from said filter element. Meanwhile, the second check valve has no function, so that the fluid can flow from the filtered side to the unfiltered side through the bypass portion. This prevents particles which could damage the pump or other components of the fluid supply system from being released from the filter element.

The fluid can for example refer to a fuel (e.g. gasoline or diesel), but it can also refer to an aqueous solution, such as an aqueous urea solution.

The filter module can also be incorporated into a liquid filter.

This liquid filter can comprise the filter module, and a filter housing into which the filter module can be fitted. The liquid filter can have at least one liquid inlet, through which unfiltered liquid is supplied to the unfiltered side of the filter module. The liquid outlet can be arranged, for example, at the filter housing. The liquid filter can also have at least one liquid outlet, by means of which filtered liquid can be conducted out of the liquid filter from the filtered side of the filter module. The liquid outlet can be arranged at the filter housing.

For the content, the dependent claims have preferred variants of the invention.

Preferably, the first check valve is disposed in the fluid feedthrough. The design of the cover element, in particular of the fluid passage, is thereby achieved very simply and cost-effectively. The first check valve allows a flow through the fluid passage in only one direction, so that it can be prevented that fluid can pass through the fluid passage from the filtered side to the unfiltered side via the fluid passage and the filter element.

Preferably, the second check valve is arranged in the bypass portion. The construction of the bypass is thereby very simple and cost-effective. The second non-return valve allows a flow through the bypass only in one direction, so that on the one hand a filter function can be ensured, and on the other hand the fluid can be conducted through the bypass from the filtered side to the unfiltered side without a flow through the filter element.

In particular, it is advantageous if the filter element is of hollow-cylindrical design and has a cover element on at least one end side. At the other end side, the filter element can have only one closure cap. It is provided here that the unfiltered side is located radially outside the filter element and the filtered side is located axially outside the cover element. The radial and axial directions are described here in relation to the cylindrical shape of the hollow cylindrical filter element. In particular, it is provided that all the following axial or radial direction descriptions used relate to the cylindrical shape of the filter element. By such a shape, the filter element can be manufactured simply and has a large surface, so that the filter module allows a large fluid throughput. At the same time, there is a spatial separation between the filtered and unfiltered sides. The first check valve, the second check valve and the bypass are advantageously arranged in the cover element. All elements required for the return function are thus present in the cover element, so that the filter element itself does not have to be changed.

By definition, the filtered side and the unfiltered side are located outside the filter module. Whereby fluid does not reach the filtered side as it leaves the filter module. Since the actual filtration process is already taking place during the passage through the filter element, the fluid thus filtered is also present radially within the hollow-cylindrical filter element, wherein this portion of the filtered fluid is not defined as belonging to the filtered side. The fluid radially inward of the hollow cylindrical filter element also remains radially inward of the filter element in the backflow mode of the filter module. Only the fluid (which is located on the filtered side, which means that the hollow cylinder-shaped filter element and in particular the axially outer part of the cover element) can pass through the bypass to the unfiltered side in the return mode.

It is particularly advantageous if the cover element has a first cover part and a second cover part. Here, a mouth region is present between the first cover part and the second cover part, which mouth region extends radially outward. In particular, the mouth region is disk-shaped and is interrupted only by a single tab, by means of which the first cover part can be connected to the second cover part. The first cover part can be mechanically connected with the second cover part, advantageously the first cover part can be screwed or clipped or welded to the second cover part, for example. Further, the first cover member has a first mouth portion, and the second cover member has a second mouth portion. The first and second mouth parts are advantageously mounted centrally in the first and second cover parts and are advantageously of the same size. Thereby, the first and second mouths are advantageously concentric with each other. The filtered side is in particular connected to the filter element via said first and second mouths. The first cover part advantageously has at least one third mouth which connects the filtered side with the mouth region. Advantageously, an interior space of the filter module, which is surrounded by the hollow-cylindrical filter element, is accessible via the first and second openings. In particular, the fluid can thus be filtered through the circumferential surface of the filter element, so that the fluid reaches the interior. From the inner chamber, the fluid can pass through the second mouth and through the first mouth to the filtered side of the filter module. It is especially provided that the fluid flows through the third mouth and the mouth region towards the unfiltered side, if the fluid should reach the unfiltered side from the filtered side. Alternatively, the cover element can be designed in one piece. In this case, the first cover member and the second cover member are manufactured as the only elements.

The bypass is advantageously formed by a third port and the port region, wherein the port region is advantageously sealed with respect to the fluid passage by the tube region. In particular, there are a plurality of third mouths which run coronally around the first mouth. Thereby, fluid can pass through the at least one third port into the port region between the first cover part and the second cover part. The fluid can be conducted radially outward from the mouth region so that the fluid can be output to the unfiltered side.

It is furthermore preferably provided that the first check valve and the second check valve are formed by sealing elements. In particular, it is thereby provided that the single element, the sealing element, performs the functions of the first non-return valve and of the second non-return valve. In this way, in particular, the return function of the filter module for bypassing the filter element is simplified, so that the filter module can be constructed in a cost-effective and time-saving manner. It is furthermore advantageously provided that the sealing element has a tube region and a flange region. The tube region connects the first mouth with the second mouth and seals the mouth region in particular with respect to the first and second mouths. Thereby, the first port, the second port and the tube region represent fluid communication portions. The flange region is advantageously arranged in the mouth region and is in particular clamped between the first cover part and the second cover part. The sealing element thus has a secure and stable seat within the cover element.

In order to realize the first non-return valve, the sealing element advantageously has a conically narrowing wall or side wall at the tube region. The conically tapering wall or side wall closes off the tube region of the sealing element. It is furthermore preferably provided that the conically tapering walls or side walls can be pushed apart from one another by the first fluid flow. In this way, the sealing element can be opened in the tube region. The first fluid flow is in particular a fluid flow through the fluid passage in the direction of the filtered side. It is thereby ensured that the fluid can pass from the interior of the filter element through the tube region of the sealing element to the filtered side by: the fluid presses conically narrowing walls or side walls away from one another. If the first fluid flow is to be stopped, the conically tapering walls or side walls again bear against one another and thereby seal the pipe region of the sealing element. If there is a fluid flow opposite to the first fluid flow, this fluid flow can no longer enter the tube region of the sealing element, so that it is prevented that fluid can flow radially outward from the inner chamber of the filter element, which leads to a release of the filtered particles. The conically narrowing wall or side wall thus represents a first non-return valve.

It is furthermore preferably provided that, for the realization of the second non-return valve, the sealing element covers the third mouth with a flange region. In this case, it is preferably provided that the flange region can be displaced by the second fluid flow in order to release the bypass. The second fluid flow is in particular a fluid flow from the filtered side through the bypass towards the unfiltered side. The second fluid flow is thereby directed in particular counter to the first fluid flow. If the first fluid flow should prevail, the fluid can pass through the mouth region of the cover element to the flange region of the cover element. Since the sealing element covers the third mouth with the flange region, it is no longer possible for fluid to exit the third mouth. This prevents unfiltered fluid from being able to reach the filtered side directly via the bypass. At the same time, the sealing element allows a second fluid flow through the bypass. A second fluid flow can move the flange region so that fluid can pass through the third mouth to reach into the mouth region. The fluid can reach from the mouth region radially outwards to the unfiltered side.

In order to increase the sealing action of the flange region and thus to improve the function of the second check valve, the mouth region preferably has an additional wall. The additional wall is advantageously arranged at the first cover part (in particular ring-shaped) and particularly advantageously surrounds the flange region. It is furthermore preferably provided that the additional wall has the same or a greater thickness, i.e. the same or a greater axial measurement dimension, than the flange region of the sealing element. The additional wall thus prevents a direct incident flow of the flange region through the fluid which enters the mouth region from the unfiltered region. In this way, the sealing action of the sealing element is increased in the function of the second non-return valve.

In a preferred embodiment of the invention, the first check valve is a mouth valve (schnabellutentil) and/or the second check valve is an umbrella valve (Schirmventil). The sealing element is preferably a combination formed by a mouth valve and an umbrella valve. The mouth valve allows a very simple provision of the non-return function, since the mouth valve, due to its shape, is able to flow through in only one direction. The mouth valve is thereby firmly blocked in the flow direction, while the mouth valve can be easily opened by the opposite flow direction. In this case, the back pressure is reduced by the mouth valve. The umbrella valve allows sealing of a large fluid passage, and is therefore particularly suitable for sealing advantageously a plurality of third mouths.

Drawings

Embodiments of the present invention are described in detail below with reference to the attached drawings. In the drawings:

figure 1 is a schematic view of a filter module according to one embodiment of the invention,

figure 2 is a first schematic view of a sealing element of a filter module according to an embodiment of the invention,

figure 3 is a second schematic view of a sealing element of a filter module according to an embodiment of the invention,

figure 4 is a schematic first detail view of a filter module according to an embodiment of the invention,

FIG. 5 is a schematic second detail view of a filter module according to an embodiment of the invention, an

Fig. 6 is a third detailed schematic view of a filter module according to an embodiment of the invention.

Detailed Description

Fig. 1 schematically shows a filter module 1 according to an embodiment of the invention. The filter module 1 comprises a hollow-cylindrical filter element 4, with which a fluid can be filtered. It is provided here that the fluid can be fed into the filter module 1 via the unfiltered side 2 located radially outside the filter element 4. Radially outside is understood to mean a direction which is oriented perpendicularly to the center axis 400 of the hollow-cylinder-shaped filter element 4. After filtration through the filter element 4, the fluid can be output to the filtered side 3, which is located axially outside the hollow cylinder-shaped end region of the filter element 4. The axially outer direction is understood to be a direction along the central axis 400. Thus, there is a clear and definite separation between the filtered side 3 and the unfiltered side 2.

In the normal operating mode, the fluid can thus be conducted from the unfiltered side 2 through the filter element 4, so that the fluid reaches the interior 19 of the filter element 4 (see fig. 4, 5, 6). The inner chamber 19 is a chamber part which is enclosed by the hollow cylindrical filter element 4. From the interior 19, the fluid can be conducted through the fluid passage 21 of the end-side cover element 9, so that the fluid can be discharged toward the filtered side 3.

The filter module 1 also allows a return flow of fluid from the filtered side 3 towards the unfiltered side 2 through the bypass 5 without the fluid having to pass through the filter element 4. In addition, the cover member 9 is divided into a first cover member 10 and a second cover member 11. A sealing element 8 is mounted between the first cover part 10 and the second cover part 11, wherein the sealing element 8 is in particular firmly clamped by the first cover part 10 and the second cover part 11. Further, the first cover member 10 has a first mouth portion 13 and a plurality of third mouth portions 15. The first mouth 13 is arranged in particular centrally in the first cover part 10 and is configured concentrically to the second mouth 14 of the second cover part 11. The plurality of third mouths 15 coronally stretches around the first mouth 13.

The sealing element 8 is schematically shown in fig. 2 and 3. The function of the first check valve 6 and of the second check valve 7 is achieved by said sealing element 8. The sealing element 8 here comprises two

non-return valves

6, 7 in the only element. The sealing element can be made of a highly elastic material, for example rubber or gum. The sealing element is thus flexible and elastic and can thus ensure the function of the two

non-return valves

6, 7.

The first non-return valve 6 has, for example, conically tapering side walls 18 which, in the closed state, taper in the upward direction in the drawing and rest against one another. The first non-return valve 6 prevents fluid from flowing through the fluid passage 21 from the filtered side 3 to the filter element 4.

The second check valve 7 is, for example, disk-shaped or umbrella-shaped. It functions just like an umbrella valve or a diaphragm valve. The second non-return valve 7 prevents fluid from flowing from the unfiltered side 2 to the filtered side 3 via the bypass 5, bypassing the filter element 4. The function of the first check valve 6 and the second check valve 7 is illustrated in fig. 4 and 5.

In fig. 2, the first non-return valve 6 is shown in the closed state. The conically tapering side walls 18 rest against one another at their free ends and thereby block the mouth.

In fig. 3, the first non-return valve 6 is shown in the opened state. In this case, the conically tapering side walls 18 are pushed apart from one another, for example by the force (fluid flow) coming from the bottom in the figure, and thus open. The free ends of the side walls 18 no longer rest against each other but release the mouth through which the fluid can flow. The first check valve 6 is designed such that the first check valve 6 is moved in a force-free state into its closed position shown in fig. 2 by means of shape elasticity or inherent material elasticity. This means that, when the force or volume flow acting from below is terminated, the side walls 18 are displaced back into the closed state of fig. 2 by the inherent elasticity of the first non-return valve 6, i.e. the free ends of the side parts rest against one another again.

The first non-return valve 6 is in particular a mouth valve. The second non-return valve 7 is preferably an umbrella valve. Thereby, the sealing element 8 is preferably a combination formed by a mouth valve and an umbrella valve.

In principle, it is also conceivable for the first check valve 6 and the second check valve 7 to be designed as two separate elements. Alternatively, although the two

non-return valves

6, 7 are integrated in the sealing element 8, they are first of all two separate elements which are only joined to form the single sealing element 8 in a further step.

Fig. 4 shows a schematic first detail view of the filter module 1 from fig. 1. In fig. 4, a situation is shown in which a first fluid flow 100 flows through the filter module 1. In this case, the fluid should be filtered and pass through the filter element 4 from the unfiltered side 2 to the filtered side 3. In this case, the second non-return valve 7 prevents the fluid from passing through the bypass 5 from the unfiltered side part 2 to the filtered side part 3 while bypassing the filter element 4.

In contrast to fig. 4, fig. 5 shows a second fluid flow 200 for which a return flow of fluid is to be achieved. The second fluid flow 200 is particularly useful for removing fluid from the system to which it should be supplied. To hinder: on return flow, which fluid has to flow through the filter element 4 and thus the filtered particles can be released from the filter element 4, a bypass 5 is present. At the same time, the first check valve 6 blocks the fluid flow through the fluid passage portion 21. The bypass 5 comprises a plurality of third mouths 15 and a mouth region 12 which is present between the first cover part 10 and the second cover part 11 and which extends radially outwards towards the unfiltered region 2.

As shown in fig. 2 and 3, the sealing element 8 has a tube region 16 and a flange region 17. The pipe region 16 is used to connect the first port portion 13 of the first cover member 10 and the second port portion 14 of the second cover member 11. The connection can preferably be sealed fluid-tightly. Thus, the tube region 16 serves to: fluid is conducted from the interior 19 of the filter element 4 through the cover element 9 to the filtered side 3. The first mouth 13, the second mouth 14 and the tube region 16 thus represent a fluid lead-through 21 (see fig. 1).

At the same time, the sealing element 8 seals the fluid passage 21 with respect to the bypass 5 by means of the tube region 16.

The tube region 16 of the sealing element 8 also has a conically narrowing side wall 18. The conically narrowing side wall 18 completely closes off the tube region 16 (see fig. 2 and 5) and thus forms a spout valve. It is provided here that the first fluid flow 100 pushes the conically narrowing side walls 18 apart from one another, as is shown in fig. 3 and 4. The tube region 16 is released by the conically narrowing side walls 18 being pushed apart from one another. In addition, only a small fluid pressure is required, thereby minimizing back pressure of the nozzle valve. When the first fluid flow 100 disappears, the tapered side walls 18 close again due to their elasticity in shape or their elasticity in material, i.e. the free ends of the side walls 18 rest against one another. Thereby, the mouth is blocked and thus also the tube region 16 is blocked or no longer released. Here, the side wall is arranged or fastened with a first end at the tube region. The second end of the side wall 18 facing away from the first end is said free end.

Unlike the first fluid flow 100, the second fluid flow 200 flowing in the opposite direction relative to the first fluid flow 100 does not squeeze apart the conically narrowing side wall 18, so that the tube region 16 remains blocked. The conically narrowing side wall 18 thereby performs the check valve function. In particular, the conically narrowing side wall 18 represents the first non-return valve 6. The pipe region 16 thus has the first non-return valve 6. This means that the tube region 16 is blocked by the conically narrowing wall 18, the fluid passing from the filtered side 3 into the interior 19 and from there through the filter element 4 to the unfiltered side 2. This advantageously hinders the release of the filtered particles from the filter element 4.

However, in order to achieve a fluid flow from the filtered side 3 towards the unfiltered side 2, a bypass 5 is present. As described earlier, the bypass portion 5 includes the third mouth portion 15 and the mouth region 12. It is provided here that the flange region 17 (see fig. 2 and 3) of the sealing element 8 represents the second non-return valve 7. It is thus provided that the flange region 17 covers the third mouths 15 as an umbrella valve, so that the transition of fluid from each third mouth 13 to the mouth region 12 is inhibited. If the fluid is to flow radially from the outside into the mouth region 12, the flange region 17 of the sealing element 8 is pressed against the first cover part 10 by the fluid pressure, so that the bypass 5 is securely and reliably blocked. This prevents fluid from the unfiltered side 2 from reaching the filtered side 3 while bypassing the filter element 4. At the same time, said fluid flowing along the second fluid flow 200 moves or (with reference to the illustrations in fig. 4 and 5) folds down or displaces the flange region 17 of the sealing element 8 downwards. In this case, the radially outer end of the flange region is folded or displaced downward. Thereby, the bypass 5 can be released, since in this case fluid can reach from the third mouth 15 to the mouth region 12. Passing through the mouth region 12 causes the fluid to be directed radially outwardly and thence out to the unfiltered region 2.

It can be seen that the fluid can flow through the filter module 1 in two directions, wherein one direction allows bypassing the filter element 4. In this way, the fluid can be filtered in only one direction, so that, in particular, it is prevented that the element that has been filtered out is released from the filter element 4 and reaches the fluid again.

Fig. 6 shows a third schematic partial view of the filter module 1 from fig. 1. In fig. 6, it is illustrated that the mouth region 12 has an additional wall 20 which is arranged at the first cover part 10. The additional wall 20 has in particular a thickness, which is the same as or greater than the flange region 17 of the sealing element 8, measured in the direction of the central axis 400. The additional wall 20 thus prevents a direct, radial or lateral incident flow of the flange region 17 by the fluid which enters the mouth region 12 from the unfiltered region 3. In addition, the additional wall 20 advantageously surrounds the flange region 17 in an annular manner. In this way, the sealing action of the sealing element 8 in the function of the second non-return valve 7 is increased, so that it is ensured that, bypassing the filter module 4, no fluid can reach from the unfiltered side 2 to the filtered side 3. In particular, the third fluid flow 300 flowing from the unfiltered side 2 into the mouth region 12 can reach the sealing element 8, in particular the flange region 17, only after deflection by the additional wall 20. Since this third fluid flow 300 cannot directly laterally encounter the flange region 17 of the sealing element 8 and lift this flange region 17 from the third mouth 15 due to the additional wall 20.

The filter module 1 can be inserted, for example, into a liquid filter, which is not shown here. This liquid filter can comprise the filter module 1 and a filter housing into which the filter module 1 can be inserted. The liquid filter can have at least one liquid feed, by means of which unfiltered liquid is supplied to the unfiltered side of the filter module 1. The liquid inlet can be provided, for example, at the filter housing. The liquid filter can also have at least one liquid outlet, by means of which filtered liquid can be discharged from the liquid filter from the filtered side of the filter module 1. The liquid outlet can be arranged at the filter housing.

The filter module 1 can be adapted for filtering a fluid fuel, such as gasoline or diesel. It can also be applied to filtering aqueous solutions of fluids for DENOX applications, such as aqueous urea solutions. In the context of this application, the term fuel is also understood to mean urea. Thus, the filter module 1 that can be used for filtering gasoline, diesel, or an aqueous urea solution can be referred to as a fuel filter module 1.

Claims

1. A filter module (1) for filtering a fluid,

-wherein the filter module (1) has an unfiltered side (2) through which fluid can be input and a filtered side (3) through which fluid can be output,

-wherein a filter element (4) is arranged between the unfiltered side portion (2) and the filtered side portion (3),

-wherein a cover element (9) with a fluid passage (21) is arranged between the filtered side (3) and the filter element (4),

-wherein the cover element (9) has a bypass (5) connecting the unfiltered side part (2) and the filtered side part (3) in order to bypass the filter element (4),

-wherein the first check valve (6) obstructs fluid flow through the fluid lead-through (21) from the filtered side towards the filter element (4) and

-wherein the second check valve (7) blocks fluid flow through the bypass (5) from the unfiltered side portion (2) towards the filtered side portion (3).

2. Filter module (1) according to claim 1, wherein the first non-return valve (6) is arranged in the fluid through-going portion (21).

3. Filter module (1) according to one of the preceding claims, wherein a second non-return valve (7) is arranged in the bypass (5).

4. Filter module (1) according to claim 1 or 2, wherein the filter element (4) is hollow cylindrical and has a cover element (9) at least one end side, wherein the unfiltered side part (2) is located radially outside the filter element (4) and the filtered side part (3) is located axially outside the cover element (9).

5. Filter module (1) according to claim 1 or 2, wherein the cover element (9) has a first cover part (10) and a second cover part (11),

-wherein between the first cover part (10) and the second cover part (11) there is a mouth region (12) which stretches radially outwards,

-wherein a first cover part (10) has a first mouth (13) and a second cover part (11) has a second mouth (14), said first and second mouths allowing connection of the filtered side (3) with the filter element (4), and

-wherein the first cover part (10) has at least one third mouth (15) connecting the filtered side (3) with the mouth area (12).

6. A filter module (1) as claimed in claim 5, wherein the bypass (5) is formed by the third mouth (15) and the mouth region (12).

7. Filter module (1) according to claim 5, wherein the first non-return valve (6) and the second non-return valve (7) are formed by a sealing element (8),

-wherein the sealing element (8) has a tube region (16) and a flange region (17), and

-wherein a tube region (16) connects the first mouth (13) with the second mouth (14) and a flange region (17) is arranged in the mouth region (12).

8. Filter module (1) according to claim 7, wherein, for realizing the first non-return valve (6), the sealing element (8) has conically tapering side walls (18) at the tube region (16), which can be squeezed apart from one another by a first fluid flow (100) which runs through the fluid passage (21) in the direction of the filtered side (3).

9. Filter module (1) according to claim 7 or 8, wherein for realizing the second non-return valve (7) the sealing element (8) covers the third mouth (15) with a flange region (17), wherein for releasing the bypass (5) the flange region (17) is movable by a second fluid flow (200) running from the filtered side (3) through the bypass (5) towards the unfiltered side (2).

10. Filter module (1) according to claim 7, wherein the mouth region (12) has an additional wall (20) which is arranged around the flange region (17) of the sealing element (8).

11. Filter module (1) according to claim 10, characterised in that the mouth region (12) has an additional wall (20) which is arranged annularly around the flange region (17) of the sealing element (8).