CN106178647B

CN106178647B - Back flush filter

Info

Publication number: CN106178647B
Application number: CN201510363948.8A
Authority: CN
Inventors: W·赫金
Original assignee: Hans Sasserath GmbH and Co KG
Current assignee: Hans Sasserath GmbH and Co KG
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2020-05-19
Anticipated expiration: 2035-05-26
Also published as: CN106178647A

Abstract

The back flush filter has the filter element who establishes in filtering the cup section of thick bamboo, forms annular chamber, its characterized in that between filter element and filtering the cup section of thick bamboo: a channel on the inner wall of the filter cartridge; a threaded receiving portion disposed at a bottom of the filter element; a ring below the filter element, whereby the ring follows the rotational movement of the filter cartridge; a protrusion on the inner wall of the ring; a headed lead screw threaded into the threaded receptacle; a boss extending above the head, the boss and the boss forming a latch mechanism, the boss being configured in an upper region such that when the filter bowl and the collar rotate in a first direction, the boss sweeps over the boss, and when the filter bowl and the collar rotate in an opposite second direction, the boss drives the boss if the lead screw is located in the upper region; the projection is configured in the lower region such that when the filter bowl and the collar rotate in the second direction, the projection sweeps over the projection, and when the filter bowl and the collar rotate in the first direction, the projection drives the projection if the lead screw is located in the lower region.

Description

Back flush filter

Technical Field

The invention relates to a filter device comprising: a fitting with an inlet and an outlet, a substantially cylindrical filter element arranged in fluid flow between the inlet and the outlet and fixed to the housing, the filter element being a backflush filter with a discharge end and a discharge valve, wherein the device is switchable from a first state in which water flows from the inlet via the filter element to the outlet, to a second state in which water flows from the inlet in the opposite direction via the filter element to the discharge end with the discharge valve open, wherein the filter element is arranged in the filter cartridge so that an annular chamber is formed between the filter element and the filter cartridge.

Background

Such a filter device is called a backflush filter. The liquid stream flows through the filter under operating conditions. In this case, dirt particles are trapped. Over time, the filter becomes clogged. The flow then reverses through the filter. The water flows in the opposite direction through the filter to the discharge end and in this case carries away the dirt particles. In this way the filter is cleaned by backwashing.

Such devices are used in domestic water appliances. The drinking water supplied by the supply line to the building or to a separate water receiving point is filtered.

Backwash filter devices are widely known. To service the filter, a barrier is provided on the front of the device. During backwashing, the water flow is directed in the opposite direction through the filter by means of a suitable switching valve mechanism. In this case, the particles adhering to the filter fall off and are taken up via the discharge end.

A filter device with a built-in leakage protection is known from DE 10200500009 a 1. The device uses a backflush filter and a turbine disposed directly in front of the backflush filter. Any water flow through the filter is detected and analyzed by the turbine.

DE 102009003343 a1 discloses a pressure reducer filter arrangement. The pressure reducer is located completely enclosed, inaccessible from the outside, in the interior space of the filter. The filter includes a filter element in a filter cartridge disposed in a filter bowl. A rotatable passage member is provided between the pressure reducer and the filter member. The channel member is provided with wings. The bottom of the filter cup cylinder is provided with a discharge end. When the discharge end is opened for back flushing, the wings are subjected to a flushing flow, whereupon the channel member rotates. The device is complex in construction and delicate.

Chinese patent application publication No. CN 102068849 discloses a filter device provided with channels, the lower ends of which are connected to a discharge end. When the discharge end is opened, the water flows downward and generates a vortex inside the channel. The channel is moved along the filter element by rotation of the channel element, thereby sucking particles away from the filter surface. This known device is complex in construction and expensive to manufacture.

Disclosure of Invention

The object of the invention is to provide a backflushing filter which is simple in construction and comprises few components. It is also an object of the invention to provide a backflush filter, in which the backflushing process can be activated particularly easily.

According to the invention, this object is achieved by a device of the type mentioned in the opening paragraph, characterized in that:

(a) axially extending channel walls which are formed in pairs to the inner wall of the filter cartridge and extend along the entire height of the filter cartridge (18) and form one or more channels (82) which are closed upwards and in the circumferential direction, open downwards towards the discharge end and open towards the inside in the radial direction;

(b) an upwardly extending, coaxial threaded receptacle disposed at the bottom of the filter element;

(c) a ring which is arranged coaxially and rotatably below the filter element and interacts with the channel wall such that the ring follows the rotational movement of the filter cartridge;

(d) one or more asymmetric protrusions on the inner wall of the collar;

(e) a threaded spindle (28) screwed into the threaded receptacle from below, the threaded spindle having a head (30) which closes the discharge end;

(f) one or more projections extending in the radial direction above the head (30), which projections form a latching mechanism with asymmetrical projections on the inner wall of the ring, wherein,

(e) the asymmetrical projections on the inner wall are configured in the upper region such that when the filter bowl and the collar are rotated in a first direction, the projections on the threaded spindle pass over the asymmetrical projections, and when the filter bowl and the collar are rotated in a second, opposite direction, the projections on the threaded spindle are driven by the asymmetrical projections if the threaded spindle is located in the upper region;

(f) the asymmetrical projection on the inner wall is configured in the lower region such that when the filter bowl and the ring are rotated in a second direction, the projection on the threaded spindle passes over the asymmetrical projection, and when the filter bowl and the ring are rotated in a first, opposite direction, the projection on the threaded spindle is carried along by the asymmetrical projection if the threaded spindle is located in the lower region.

Thus, unlike known backflushing filters, the device of the invention makes use of channel walls which form channels in which vortices are generated with the discharge end open. The channel walls are part of the filter cartridge. By rotating the filter cartridge, the channel is moved past the filter element by the side of the opening located in the interior. In this case, the dirt particles are sucked off in each angular region successively along the entire height and are absorbed via the discharge end. The backwashing is initiated and carried out by the rotation of the filter cartridge. In the operating state, water flows from the inlet into the annular chamber. From the annular chamber, the water flows into the central region via the cylindrical filter element and from there, in the filtered state, to the outlet.

Instead of a ball valve, this device uses a threaded spindle which is screwed in the bottom of the filter element. On the underside facing away from the base, the spindle has a head with which the discharge end is closed. The backwash position is achieved by opening of the discharge end. By rotation of the filter cartridge, the collar also rotates. The ring has at least one protrusion on the inside. The spindle has at least one projection which extends in the radial direction above the head, i.e. in the region of the ring. When the ring rotates, the protrusions touch the bosses on the lead screw. Depending on the direction of rotation, the boss acts as a chuck, so that the spindle also rotates. When the direction of rotation is reversed, the protrusions on the ring sweep over the bosses based on the asymmetrical shape of the protrusions. The boss and the projection thus act like a latch mechanism: in one direction, the spindle is rotated, while in the other direction, the spindle remains in its angular position, independently of whether the filter cartridge is actuated or not.

With the device of the invention, the asymmetry varies with height. In the lower region of the ring, the projection is designed such that the spindle moves upwards when rotating in a thread fixed to the housing. In this case, the head is moved out of the discharge end. In the upper region of the ring, the projection is designed such that the spindle moves downward when it rotates. In this case, the discharge end is closed. It is also possible to provide a region between them, in which the screw can be moved in both directions. The latching mechanism is thus preferably only specified at the end of the rotational movement. A locking mechanism is used to ensure that the spindle can be moved in the vertical direction only along a certain region. If the filter cup and thus the ring rotate past this region, the rotary motion is no longer transmitted to the spindle. Jamming or over-rotation of the lead screw does not occur. The person turning the filter cup receives a tactile signal that the spindle rotation is complete and the discharge end is fully closed or open.

Preferably, it is provided that the raised middle region allows the same number of revolutions as is required for cleaning the filter. This can be influenced by the height of the intermediate region, the number of passages in the inner wall of the filter cup and the screw pitch. In the case of three channels, for example three revolutions, is sufficient for cleaning. Each angular zone is then swept approximately 9 times "on the go" and approximately 9 times "on the return" by the channel member, so that thorough cleaning is achieved. Once the end region is reached, the rotation of the filter cartridge can be reversed. The tactile signal of the latch mechanism allows this condition to be easily detected. Furthermore, the upper end position of the latching mechanism ensures that the filter is rotated through any number of turns for cleaning, wherein each turn is fed back by a tactile signal.

Provision is preferably made for the projection to extend along the entire height of the ring. Here, as described above, the projections are not necessarily asymmetrical along the entire height. In particular, the projections may be rounded off from one side in the upper and/or lower region and have sharp edges from the opposite side. The projection sweeps the boss with rounded sides and imparts rotational motion with sharp edges.

In one embodiment of the invention, the channel walls on the inner side of the filter cartridge engage in recesses (Ausbuchtung) on the outer side of the ring, which recesses are formed in the region of the smaller wall thickness. However, it is also possible for the ring to be firmly connected to the channel wall, or for the device to be formed integrally from the filter cartridge, the channel wall and the ring. The advantage of using a ring with notches is that these parts can easily be made, for example, by injection moulding.

The filter cartridge is preferably fixed to an adapter which is rotatably connected to the fitting, so that the adapter, the filter cartridge and the ring form a rotatable group. In particular, knurling or projections can be provided on the adapter and/or the filter cartridge in order to improve the handling.

According to a further embodiment of the invention, 6 channel walls are provided on the inner side of the filter cartridge, which channel walls form three channels. More or fewer channels may be used.

According to a further embodiment of the invention, the ring has notches which connect the channel to the discharge end. The filter component is positioned at the bottom of the filter cup cylinder. In the region of the ring, the bottom is slightly lowered, so that the ring is accommodated in the lowered portion. The notch is arranged in the region of the channel and forms a connection of the channel to the discharge end.

The filter element is preferably formed by a filter insert arranged coaxially in the filter cartridge, which has a plurality of annular ribs which are arranged axially upward and downward and are connected to one another by connecting webs. Such a filter element can be backwashed well. The filter member, like the other components, may be made of a durable plastic.

A preferred embodiment of the invention provides that a channel part is provided, which opens at its upper end into an outlet channel in the fitting housing, which channel part communicates with the outlet, and is connected at its lower end to the filter part, the channel part having a lug at its upper end, which lug engages in a groove on the inner wall of the fitting housing. In this way it is ensured that the filter element does not rotate concomitantly. It goes without saying that the channel part can also be constructed integrally with the filter part.

In a further embodiment of the invention, a cover element for closing the channels is provided at the upper end, wherein the corner regions of the cover element between the channels are uncovered. Instead of a cover, other ways of closing the passage may be used.

In one design of the invention, the fitting has a barrier for blocking the inlet. The barrier enables simple maintenance of the device.

Drawings

Improvements of the invention are the subject of the dependent claims. The embodiments are described in detail below with reference to the accompanying drawings.

3 FIG. 3 1 3 is 3 a 3 longitudinal 3 section 3 through 3 a 3 backwash 3 filter 3 in 3 the 3 operating 3 position 3 along 3 section 3 A 3- 3 A 3; 3

3 FIG. 32 3 is 3 a 3 longitudinal 3 section 3 through 3 the 3 backflush 3 filter 3 of 3 FIG. 3 1 3 along 3 section 3 B 3- 3 B 3, 3 which 3 is 3 rotated 3 by 3 an 3 angle 3 of 3 75 3 ° 3 relative 3 to 3 section 3 A 3- 3 A 3; 3

FIG. 3 shows the backflush filter similar to FIG. 2 in a backflush position;

FIG. 4 shows the backflush filter similar to FIG. 1 in a backflush position;

FIG. 5 is a cross-sectional view of the backflush filter of FIG. 1 taken along section C-C, where the lead screw is rotated;

FIG. 6 is a cross-sectional view similar to FIG. 5 in an end position where the lead screw is not co-rotating;

FIG. 7 is a cross-sectional view of the backflush filter of FIG. 1 taken along section D-D;

FIG. 8 is a cross-sectional view of the backflush filter of FIG. 1 taken along section plane E-E;

FIG. 9 is a cross-sectional view of the backflush filter of FIG. 1 taken along section plane F-F;

FIG. 10 is an exploded perspective view of the backflush filter of FIG. 1;

FIG. 11 is an exploded view of the backflush filter of FIG. 1, with the filter cartridge shown in isolation;

FIG. 12 is a top view of the components of the backflush filter of FIG. 1;

FIG. 13 shows a filter bowl of the backflush filter of FIG. 1 with a lid;

FIG. 14 shows the lead screw of the backflush filter of FIG. 1 separately;

fig. 15 shows the ring of the backflush filter of fig. 1 separately.

Detailed Description

Fig. 1 shows a filter fitting for drinking water, generally designated 10. The fitting 10 has a fitting housing 12 with an inlet 14 and an outlet 16 arranged coaxially with the inlet. The fitting housing 12 may be installed into a pipeline (not shown). To block the inlet, some common ball valve may be preceded. The fitting 10 is connected with an inlet 14 to a drinking water supply, not shown. Water flowing from the outlet 16 is directed to a water receiving point in the building.

The filter assembly 10 has a filter bowl 18 made of plastic. The fitting housing 12 has a connecting stub 22. The filter cartridge 18 is provided with external threads 20. The filter cartridge 18 is screwed into an adapter 21 made of plastic using an external thread 20. A sealing ring 23 is arranged in an annular groove at the upper end of the filter cup cartridge and seals against the adapter 21. The connecting stub 22 has an annular groove with a sealing ring 25 at the lower end. The upper end 27 of the adapter 21 is slipped onto the connecting stub 22. In the axial direction, the adapter 21 is held by the clip 29. The clip is clearly visible in figures 8, 11 and 12. The clips 29 snap into the slots 27 in the upper region of the adapter, as shown in fig. 8. The clip is inserted into a recess in the connecting stub 22. The adapter 21 is thus fixedly and sealingly seated on the connecting piece 22, but is freely rotatable with the filter cartridge 18 relative to the fitting housing 12.

A discharge end 26 is provided in the bottom region of the filter cup cartridge 18. The discharge end 26 is closed in the operating position by a head 30 of the rotary spindle 28 and a seal 32. The working position is shown in fig. 1. The head 30 is axially movable within the discharge end 26.

A filter insert 48 is coaxially disposed within the filter bowl 18. The cartridge 48 is a plastic piece. The filter insert 48 has a plurality of annular ribs 52 which are arranged axially upwardly and downwardly. The ribs 52 form a cylindrical shape. The ribs 52 are connected to each other by a connecting bar 60. The connecting strip 60 has a triangular cross-section and can be seen clearly in fig. 9.

An annular cavity 38 is formed between the inner wall of filter bowl 18 and filter element 48. The upper end of the annular chamber opens into the inlet 14. The lower end of the annular chamber 38 opens into the region 36 below the closed bottom 34 formed by the filter insert 48. Formed on the base 34 is an upwardly formed threaded receptacle 40 with internal threads 42. The rotary spindle 28 is screwed into the threaded receptacle 40. The rotary screw 28 is shown separately in fig. 14. By rotation of the rotary screw 28, its head 30 is moved in the axial direction. The discharge end 26 opens when the head 30 moves upwardly out of the discharge end 26. This is the backwash position described in detail below with reference to figures 3 and 4.

In the fitting housing 12, a wall 46 is formed between the

inlets

14 and 16. On the outlet side of the wall 46, a narrowing channel part 50 is provided. The upper end of the channel member 50 opens into an outlet channel 54 in the fitting housing 12 that is connected to the outlet 16. Lugs 57 at the upper end of the channel member 50 are inserted into slots in the inner wall of the fitting housing 12. The lugs 57 can be seen clearly in figure 11. In this way, the channel part 50 is held in its position non-rotatably and fixedly with the housing. The lower end of the channel member 50 is inserted into the cartridge 48 along with the seal member 56. The channel member 50 has a plurality of connections in the form of collets 55 below the seal 56. The cartridge 48 is also secured against rotation in the fitting housing 12 by the cartridge connector 55 of the channel member 50 being inserted between the connector strips 60. Channel member 50 extends coaxially with filter element 48, filter bowl 18, and nipple 22 through the length of nipple 22 to filter bowl 18.

In the operating position shown in fig. 1 and 2, water flows into the fitting housing 12 via the inlet 14 in the direction of arrow 44. There, the water flows in the direction of the arrow 58 externally through the channel part 50 down into the annular chamber 38. Water flows inwardly from the annular chamber 38 through the filter element 48 in the direction of arrow 62. In this embodiment, the cartridge 48 is hollow on the inside, forming a central passage 64 for the filtered water. From the central passage 64, the water flows internally up through the passage member 50 to the outlet passage 54. This is indicated by arrow 66. Water is then provided at outlet 16 for further use.

The bottom 34 of the cartridge 48 is supported on the collar 68 and on the end of the channel 82. Fig. 15 shows the ring 68 in isolation. The ring 68 is constructed of plastic. The annular ring 68 is positioned concentrically with the upper discharge opening of the discharge end 26 between the bottom 70 of the filter bowl 18 and the bottom 34 of the filter cartridge 48. This is shown in fig. 1. The rotary spindle 28 projects through the ring 68 into the threaded receptacle 40.

The ring 68 has three

regions

72, 74 and 76 of small wall thickness. Accordingly, notches are formed in these

regions

72, 74 and 76 that extend along the entire height of the loop 68. Formed in pairs on the inner side of the filter cartridge 18 are 6

channel walls

78, 80. These channel walls can be clearly seen in fig. 5 and 6. Each pair of channel walls, such as

channel walls

78 and 80 in fig. 5, forms a channel 82. The channels 82 formed by the

channel walls

78 and 80, in this embodiment three channels 82, extend along the entire height of the filter cartridge 18 and extend toward the bottom. Where the filter is supported. At the upper end, a cover 83 is provided, by means of which the channel 82 is closed upwards. The cover 83 can be clearly seen in fig. 7 and 13. The angled regions of the cover 83 between those channels 82 are uncovered. Thus, water may pass in the annular chamber in the angled regions between the passages 82. The

channel walls

78, 80 extend substantially radially into recesses formed in the annular wall of the annular ring 68 in the

regions

72, 74 and 76. This can be seen clearly in figure 5. In this way, the ring 68 is held in the filter cup 18 so as to be non-rotatable. With respect to the fitting installation, the arrow 92 on the exterior of the fitting housing 12 indicates the water flow direction, as can be seen in fig. 10.

Above the head 30 of the rotary spindle 28, two projections 84 offset by 180 ° are formed on the rotary spindle 28. These bosses 84 are clearly visible in fig. 5 and 14. At the upper edge of the inner side of the ring 68, two projections 86 are formed, which are offset by an angle of 180 °. These projections can be clearly seen in fig. 5 and 15. The projection 86 has rounded flanks 88 and a sharp edge 90 in the upper region. If the collar is moved counterclockwise in FIG. 3, such movement is arrested by boss 84 at edge 90. This situation is shown in fig. 5. The opposite, i.e. counter-clockwise, movement remains possible due to the rounded sides 88 on the projections 86. This is shown in fig. 6. In the following region, the situation is reversed. Here, the sharp edge 196 is on the opposite side, so that a clockwise rotation of the ring 68 is braked. Thus, counterclockwise rotation of the ring 68 is maintained possible due to the rounded sides 198. The ring 68 thus acts like a detent of the boss 84. Movement is permitted in one direction wherein a distinct click sound can be heard or felt. In the opposite direction, the movement is braked. The boss 84 then acts as a collet. The lead screw 28 rotates.

The filter formed by the filter element 48 becomes clogged over time. In this case, dirt particles settle on the outer side of the filter. For cleaning, the filter is backwashed, i.e. water flows through the filter in the opposite direction and in this case dissolves dirt particles. The backwash position is shown in figures 3 and 4. For backwashing, the rotationally movable group of adapter 21, filter bowl 18 and ring 68 is rotated clockwise. For ease of handling, the adapter 21 has ribs 94 for this purpose, which can be seen in fig. 10.

During rotation, the sharp edge on ring 68 encounters boss 84. Thereby rotating the lead screw 28. Since the filter insert 48 with the receptacle 40 is arranged fixedly with the housing, during the rotational movement of the group, the spindle 28 is moved upward in the axial direction in the direction of the arrow 92 into the position shown in fig. 3 and 4. The discharge end 26 is open. In this case, water flows from the inlet 14 into the annular chamber 38. From the annular chamber 38, the water flows through the filter in the direction of arrow 96 in fig. 4. The annular chamber 38 is closed off downwards by the bottom of the filter cartridge 18. Water flows from the lumen in the opposite direction through the filter into the passage 82. This is illustrated in fig. 4 by arrow 98. The channel 82 connects to the region 36 at the bottom of the filter bowl. Through the open discharge end 26, water flows downwardly from the region 36 through the openings 97 in the ring 68 and creates a swirling action in the channel 82. This swirling action causes water to flow from the filter interior region in the opposite direction through the filter into the passage 82 and from there to the discharge end 26. In this case, dirt particles are carried away from the filter outer surface and are taken up via the discharge end 26 with the backwash water. As the set of adapter 21, filter bowl 18 and collar 68 rotates, the passage 82 sweeps through all angular regions of the filter in sequence. In this way the filter is thoroughly cleaned.

Upon rotation, the head 30 of the lead screw 28 moves upward along with the boss 84. A sharp edge 196 extends in the vertical direction over the greater part of the projection 84. At the top, the sharp edge 196 is removed by the rounding 88 in the upper region of the projection 84. The spindle 28 then no longer moves with it, but jumps over the protrusion like a chuck. This achieves that after a few revolutions no further rotation of the spindle takes place and the user notices that the filter is thoroughly cleaned. The filter can then be rotated in the opposite direction, and the spindle 28 is rotated back again, so that the filter device again reaches the operating position shown in fig. 1.

This arrangement has the advantage that the installer may not apply excessive force to the lead screw 28. Over-rotation and consequent damage to the device does not occur. Further rotation may be performed, if desired, to clean the filter.

Claims

1. A filter device (10) comprising: a fitting (12) having an inlet (14) and an outlet (16), a substantially cylindrical filter element (48) which is arranged in terms of the flow of liquid between the inlet (14) and the outlet (16) and is fixed to the housing, the filter element being a backflush filter having a discharge end (26) and a discharge valve (28), wherein the device is switchable from a first state in which water flows from the inlet (14) to the outlet (16) via the filter element (48) to a second state in which water flows from the inlet (14) to the discharge end (26) via the filter element (48) in the opposite direction with the discharge valve (28) open, wherein the filter element (48) is arranged in the filter bowl (18) so that an annular chamber (38) is formed between the filter element (48) and the filter bowl (18),

the method is characterized in that:

(a) axially extending channel walls (78, 80) formed in pairs to the inner wall of the filter cartridge (18) and extending along the entire height of the channel member (68) and forming one or more channels (82) which are upwardly and circumferentially closed, open downwardly towards the discharge end and open inwardly in the radial direction;

(b) an upwardly extending, coaxial threaded receptacle (40) disposed in the bottom (34) of the filter element (48);

(c) a ring (68) which is arranged coaxially and rotatably below the filter element (48) and interacts with the channel walls (78, 80) such that the ring (68) follows the rotational movement of the filter cartridge (18);

(d) one or more asymmetric protrusions (86) on an inner wall of the collar (68);

(e) a spindle (28) which is screwed into the threaded receptacle (40) from below and has a head (30) which closes the discharge end (26);

(f) one or more projections (84) extending in the radial direction above the head (30) and forming a latching mechanism with asymmetrical projections (86) on the inner wall of the ring (68), wherein,

(e) the asymmetrical projection (86) on the inner wall is configured in the upper region such that if the threaded spindle (28) is located in the upper region, the projection (84) on the threaded spindle (28) rides over the asymmetrical projection (86) when the filter bowl (18) and the collar (68) are rotated in a first direction, and the projection (84) on the threaded spindle (28) carries the asymmetrical projection (86) when the filter bowl (18) and the collar (68) are rotated in a second, opposite direction;

(f) the asymmetrical projection (86) on the inner wall is configured in the lower region such that if the threaded spindle (28) is located in the lower region, the projection (84) on the threaded spindle (28) rides over the asymmetrical projection (86) when the filter bowl (18) and the collar (68) are rotated in the second direction, and the projection (84) on the threaded spindle (28) entrains the asymmetrical projection (86) when the filter bowl (18) and the collar (68) are rotated in the first, opposite direction.

2. A filter device as claimed in claim 1, wherein the projection (86) extends along the entire height of the collar (68).

3. A filter device as claimed in claim 1, characterized in that the projection (86) is rounded off from one side (88, 198) in the upper and/or lower region and has a sharp edge from the opposite side (90, 196).

4. A filter device as claimed in claim 1, characterized in that the channel walls (78, 80) on the inner side of the filter cartridge (18) engage in recesses (72, 74, 76) on the outer side of the ring (68), which recesses form regions of reduced wall thickness.

5. A filter device according to claim 1, wherein the filter bowl (18) is secured to an adapter (21) which is rotatably connected to said fitting (12) such that the adapter (21), the filter bowl (18) and the collar (68) form a rotatable set.

6. A filter device as claimed in claim 1, characterized in that 6 channel walls (78, 80) are provided on the inner side of the filter cartridge (18), which channel walls form three channels (82).

7. A filter device as claimed in claim 1, characterised in that the ring (68) has a cut-out which brings about the connection of the channel (82) to the discharge end (26).

8. A filter device as claimed in claim 1, characterized in that the filter member (48) is formed by a filter insert (48) arranged coaxially in the filter cartridge (18) and having a plurality of annular ribs (52) arranged axially upwardly and downwardly and interconnected by a connecting strip (60).

9. A filter device according to claim 1, c h a r a c t e r i z e d by a channel member (50) which opens at its upper end into an outlet channel (54) in the fitting housing (12) communicating with the outlet (16) and which is connected at its lower end to the filter member (48), the channel member having a lug (57) at its upper end which is inserted into a groove in the inner wall of the fitting housing (12).

10. A filter device as claimed in claim 1, characterised by a cover (83) at the upper end for closing the channels (82), wherein the angular regions of the cover (83) between the channels (82) are uncovered.