WO2011038811A1

WO2011038811A1 - Filter device

Info

Publication number: WO2011038811A1
Application number: PCT/EP2010/005257
Authority: WO
Inventors: Dietmar Wensauer
Original assignee: Robert Bosch Gmbh; Winter, Frank
Priority date: 2009-10-02
Filing date: 2010-08-27
Publication date: 2011-04-07
Also published as: DE102009048016A1; WO2011038811A8

Abstract

The invention discloses a filter device, in particular a trapezoidal trough filter, for coolants and/or lubricants. Said device has a filter container in which a plurality of partitioning panels are arranged between two longitudinal sides. Said panels, together with said longitudinal sides, form a chamber for dirty fluid. The partinioning panels have plurality of openings that are covered by a filter, the fluid being able to flow from the dirty fluid chamber to a clean fluid chamber via said openings. The partitioning panels are arranged such that a comparatively high fluid column of the fluid to be filtered is able to form in the dirty fluid chamber.

Description

filter means

description

The invention is based on a filter device, in particular a trapezoidal well filter, according to the preamble of patent claim 1.

Such a filter device is shown in EP 1 671 694 A2. This has a revolving support band which engages in sections with an outside a drum-shaped wheel, the interior of which limits a dirt fluid space. Between the outside of the strap and a peripheral portion of the drum-shaped wheel, a filter fleece is guided and is conveyed from a supply roll by a conveying movement of the wheel and the strap to a collecting container. A liquid to be cleaned enters into the dirty liquid space approximately in the area of the axis of rotation of the wheel and flows via the filter fleece to the pure liquid space. Particles are filtered over the filter fleece and form a filter cake, which is then transported by the promotion of the filter fleece to the collecting container, while non-contaminated filter fleece is nachgefördert in the Schmutzflüssig- keitsraum.

The disadvantage here is that for conveying the filter fleece a device technically complex drum-shaped wheel is necessary. The size of the dirty liquid space is limited by the radius of the wheel. The filter fleece is held only by the fastener tape, which is why a flow guide high pressures and large transport distances of the filter fleece is not equal. DE 20 2006 010 759 U1 discloses a further filter device. This has a filter container in which a dirty liquid space is separated via a partition wall of a clean liquid space. Along the dividing wall side, which faces the dirty liquid space, runs a circulating conveyor chain. Between the conveyor chain and the partition is a filter fleece, which is conveyed via the conveyor chain from a supply roll to a container. A section of the partition wall is set at about an angle of 30 ° to a horizontal and serves as a passage of the liquid to be filtered from the dirty liquid space to the clean liquid space. At the clean liquid space a hydraulic pump is connected via an outlet channel, which sucks liquid from the clean liquid space. This creates a negative pressure in the clean and Schmützflüssigkeitsraum, through which the filter throughput of the liquid to be filtered are increased from the Schmützflüssigkeitsraum to pure liquid space and the filter performance of the filter device.

This solution has the disadvantage that such a filter device is constructed extremely expensive and expensive and has a high energy consumption in use by the hydraulic pump. In addition, a further liquid reservoir is required for the filtered liquid, in which it can be removed under normal pressure.

The document DE 91 14 802 U1 shows a further embodiment of a filter device. In contrast to the previous embodiment, no hydraulic pump and no conveyor chain are present. The filter fleece is conveyed here via a driven take-up reel from a supply roll over the Schmützflüssigkeitsraum delimiting dividing wall.

At high filter performance, ie at a high filter throughput through the filter fabric this can disadvantageously easily solve the partition due to the simple flow guide without conveyor chain. Furthermore, due to the lack of hydrogen ropumpe the filter performance significantly reduced in contrast to the above-described prior art.

In contrast, the object of the invention is to provide a filter device with a low outlay in terms of apparatus and a high filter performance.

This object is achieved by a filter device according to the features of patent claim 1.

According to the invention, a filter device, in particular a trapezoidal well filter, for coolants or lubricants has a filter container. In this a plurality of interconnected partition plates are arranged between two longitudinal sides, wherein the longitudinal sides together with the partition plates delimiting a dirty liquid space. This is connected via openings covered by a filter in at least one partition plate with a clean liquid space. The separating plates are arranged in such a way that a liquid column in the dirty liquid space is optimized with regard to the filtering effect and a liquid column which is high in comparison with the prior art can be formed.

This solution has the advantage that due to the high liquid column at its base area a high pressure prevails, whereby liquid to be filtered flows with a high pressure force from the dirty liquid space via the filter to the clean liquid space. The filter throughput of the liquid to be cleaned is thereby substantially increased. With such a filter device, a high filter throughput of liquid to be filtered is thus made possible by the filter in a simple device construction of the filter device.

The height of the liquid column is preferably at least 500mm. The filter may be a conventional filter fleece, which is displaceably fixed on the separating plates at least in sections via two circulating conveyor chains arranged approximately parallel to the longitudinal sides of the filter container and parallel to one another at a parallel spacing. The filter fleece is then conveyed from the supply chains of a supply roll on the separator plates to a winding reel. Additionally, in addition to the conveyor chains, the filter fleece can be conveyed by turning the winding reel. Due to the conveyor chains, the filter fabric is fixed securely on the separator plates even at a high filter throughput of the liquid to be filtered and high pressures.

Advantageously, in the filter container, a lower and two lateral partition plates - arranged in a longitudinal sectional view of the filter device - approximately trapezoidal. The lower partition plate extends approximately horizontally and the first laterally arranged to the lower partition plate partition plate approximately vertically. A second separator plate disposed laterally of the lower separator plate has an angle of at least about 60 degrees to a horizontal plane and is inclined away from the first separator plate. The second lateral separating plate is arranged last in the conveying direction of the filter fleece. The trapezoidal arrangement of the separating plates and in particular the arrangement of the lateral separating plates with a low tilting angle to Verti-len lead to an extremely compact design of the filter container and at the same time to a high liquid column compared to the prior art. In addition, while the surface of the lower partition plate is only slightly smaller than the footprint of the filter container. So a large area is available for filtration. As a result of the approximately horizontal arrangement of the lower separating plate, the high pressure of an underside of the liquid column advantageously prevails over this over its entire length and width.

Preferably, the two conveyor chains are connected to each other via a plurality of approximately mutually parallel transverse struts. With these, on the one hand, a secure guidance of the filter fabric on the partition plates can be further increased and, on the other hand, a filter cake or filtered particles are themselves in the Separation plate with en steep angle of at least about 60 ° substantially completely from the dirty liquid space conveyed.

In a further preferred embodiment of the invention, openings for connecting the dirty liquid space to the clean liquid space are also introduced in a lateral separating plate, preferably in all separating plates, whereby an extremely high filter throughput of the liquid is made possible.

In order to increase the safe guidance of the conveyor chains and thus the filter fleece even further, the conveyor chains on the side facing away from the filter fleece in the transition region of the separator plates with a curved guide plate and along the partition plates sections guided with slides, the conveyor chains on the slide rails in addition to springs in Direction of the filter fleece can be acted upon by a spring force.

Preferably, the conveyor chain is guided in the return between the lateral separating plates around a further guide plate arranged in the dirty liquid space, whereby a cost-effective float switch for measuring the liquid column is arranged above the guide plate, whereby measurement of the liquid column is possible with a low technical outlay.

Drive elements for driving the conveyor chain and the winding reel are preferably arranged on one side of the filter container, whereby the accessibility is simplified during maintenance.

For deflecting the conveyor chain and the filter fabric on the first lateral partition a deflection roller is provided. In the guide roller advantageously connected to the dirty liquid space inlet channel is formed for the dirty liquid. Thus, no additional opening in the filter container for the inlet channel is needed. To strip the filter cake on the filter fabric before winding on the take-up reel, a scraper is provided with a retaining hook. The retaining hook engages behind a mounted in the filter housing bearing axis and is pressed by its own weight with a stripper plate on a surface of the filter fabric for stripping the filter cake.

Other advantageous developments of the invention are the subject of further subclaims. In the following, a preferred embodiment of the invention will be explained in more detail with reference to schematic drawings. Show it:

1 shows a longitudinal sectional view of a filter device according to an embodiment;

Figure 2 is a front view of the filter device of Figure 1; and

FIG. 3 shows a top view of the filter device from FIG. 1. FIG. 1 is a longitudinal sectional view of a filter device 1, which is shown in FIG

Trapezoidal well filter is formed, shown according to one embodiment. This is used for the continuous filtration of, for example, water-mixed cooling lubricants, oils or other liquids. The filter device 1 has a filter container 2, in which over approximately trapezoidally arranged separating plates 4, 6 and 8, a dirty liquid space 10 is separated from a clean liquid chamber 12. On a dirt liquid space 10 facing side of the partition plates 4 to 8, a filter fabric 14 with two rotating conveyor chains 16, 18 is performed. Liquid to be filtered enters the dirty liquid space 10 via an inlet pipe 20 and, filtered through the filter fabric 14 and openings in the separating plates 6 to 8, enters the clean liquid space 12. The filter container 2 has two approximately parallel longitudinal sides 22, 24, an upper side 26, a left and right lateral side 28 and 30 in FIG. 1, and a bottom side 32.

The partition plates 4 to 8 extend approximately transversely between the longitudinal sides 22 and 24. The left in Figure 1 separating plate 4 is arranged approximately perpendicular to the bottom side 32 and to a horizontal. The lower partition plate 6 extends approximately in a horizontal and is at the bottom side 32 in the parallel distance. The right in Figure 1 partition plate 8 is angled with an angle of at least 60 ° to the horizontal, wherein the partition plate 8 is then inclined away from the partition plate 4. A vertical height of the partition plates 4 and 8 is approximately equal. Approximately in parallel distance to the left partition plate 4, a partition wall 34 is arranged between this and the transverse side 28, which together with the partition plate 4 and the longitudinal sides 22, 24 delimits a space portion 36 of the clean liquid space 12. Another partition wall 38 is arranged between the obliquely arranged right partition plate 8 at a parallel distance to this on the side facing away from the dirty liquid space 10. This limits, together with the partition plate 8 and the longitudinal sides 22, 24, a further space section 40 of the clean liquid space 12. Filtered liquid can thus flow from the space sections 36, 40 to a space section 42 of the dirty liquid space 10 formed below the lower separation plate 6. The lower space portion 42 is opened, for example, down in Figure 1, whereby filtered liquid, for example, passes into a collecting container arranged underneath. The clean liquid chamber 12 could also be arranged completely outside the filter container 2 and, for example, consist only of the collecting container.

The partition plates 4, 6 and 8 are connected to each other via curved connecting plates 44, 46. The filter fleece 14 is guided by a supply roll 48, which extends approximately perpendicular to the plane of the drawing in FIG. 1, to the left separating plate 4 and then extends along the separating plates 4, the connecting plate 44 of the lower partition plate 6, the connecting plate 46 to the right partition plate 8. From this, the filter fabric 14 is further guided over a in Fig. 1 from the partition plate 8 to the right staggered guide roller 50 and then wound on an approximately below the guide roller 50 winding reel 52 , For monitoring the remaining amount of filter fleece on the supply roll 48, a fleece flow switch 53 is provided.

The conveyor chains 16 and 18 extend approximately parallel to each other and are each adjacent to a longitudinal side 22 and 24 respectively. Between the two conveyor chains 16, 18 are arranged transversely to the direction of extension of a plurality of mutually parallel spaced crossbars 54 and scratch angles. These are evenly distributed over the entire circulation of the conveyor chains 16, 18. The conveyor chains 16, 18 are guided via a deflection roller 49 on the left in Figure 1 separator plate 4 such that the filter fabric 14 between the conveyor chains 16, 18 and the separator plate 4 is fixed. The extension of the conveyor chains 16, 18 is carried out according to the filter fabric 14 along the partition plates 4 to 8 to about the right in Figure 1 right dividing plate 8 arranged drive shaft 56 of the conveyor chains 16, 18. This is arranged such that the conveyor chains 16, 18 extend approximately parallel to the inclined partition plate 8 to the drive shaft 56. The conveyor chains 16, 18 are deflected by the drive shaft 56 such that they extend at an acute angle to the partition plate 8 in the direction of the dirty liquid space 10. In this then a curved guide plate 58 is fixed between the longitudinal sides 22, 24, which deflects the conveyor chains 16, 18 in the direction of the guide roller 49. The conveyor chains 16, 18 thus extend in the return V-shaped in the dirty liquid space 10, whereby above the conveyor chains 16, 18 approximately in the area above the guide plate 58, a float switch 60 can be arranged. This has an approximately perpendicular to the horizontal extending guide rod 62 to which a floating body 64 is slidably mounted. The floating body 64 then displays the current liquid level of the liquid in the dirty liquid space 10. The conveyor chains 16, 18 are guided with the example of plastic slide rails 66, 68 and 70, which are each arranged on the side facing away from the filter fabric 14 side of the conveyor chains 16, 18, on the partition plates 4 to 8. The slide rail 66 extends approximately parallel to the separator plate 4, the slide rail 68 to the separator plate 6 and the slide rails 70 to the separator plate 8. In the transition region of the separator plates 4 to 8 curved guide plates 73, 74 are arranged convexly toward the conveyor chains 16, 18 ,

The slide rails 66, 68 and 70 can in each case be displaceable in the direction of the adjacent separating plate 4, 6 or 8 and in each case additionally acted upon by a spring force of a spring supported on the filter container 2, as a result of which the conveyor chains 16, 18 and the filter fleece 14 would be better defined on the separator plates 4 to 8. With the conveyor chains 16, 18 is further a backwash the filter fabric

14 reliably avoided.

The conveyor chains 16, 18 are driven via the drive shaft 56, which in turn is driven via a drive motor 76 arranged laterally outside the rear longitudinal side 22 in FIG. 1 outside of the filter container 2. The winding reel 52 is also driven by the drive motor 76, which is explained in more detail below in Figure 2.

The separating plates 4, 6 and 8 are designed as perforated plates or have different openings for the passage of the liquid from the dirty to the clean liquid space.

The liquid to be purified flows via an inlet channel 78 which is formed in the deflection roller 49 from the outside of the filter container 2 to the inlet pipe 20, which extends from the deflection roller 49 and thus from the inlet channel 78 in the direction of the dirty liquid space 10. The inlet pipe 20 opens into an inlet Distributed 80. This and the inlet pipe 20 have a plurality of openings and serve to allow a uniform and comparatively slow inflow of liquid into the dirty liquid space. Liquid to be filtered thus flows from the inlet channel 78 into the inlet pipe 20 and the inlet distributor 80 and from there into the dirty liquid space 10

In the dirty liquid space 10, a liquid column of the liquid to be filtered can be formed at least up to the deflection roller 49 or the inlet channel 78. The liquid column is preferably more than 500 mm, whereby a high pressure prevails below this liquid column and the liquid to be filtered passes at a high speed, in particular through the most deeply arranged in the dirty liquid space 10 partition plate 6 passes. Due to the approximately trapezoidal arrangement of the partition plates 4 to 8 and the high construction, a large-area filter surface is formed. Liquid to be filtered can flow into the pure liquid space 12 over the entire separating plates 4 to 8.

As the liquid to be filtered flows through the filter fleece 14, it collects filtered particles which form a filter cake. The more particles accumulate, the greater the flow resistance through the filter fleece 14, whereby the filter throughput is reduced. A lower filter throughput leads to an increase in the liquid acid, which is detected via the floating body 64. From a certain height of the liquid column, for example just before liquid passes over an upper edge of the separating plate 6, 8, the soiled filter fabric 14 is conveyed via the conveyor chains 16, 18 together with the filter cake from the dirty liquid space 10 and wound on the co-rotating winding reel 25 , A clean filter fleece 14 then passes from the supply roll 48 into the dirty liquid space 10. The cross braces 54 between the conveyor chains 16, 18 prevent filter cake from falling back into the dirty liquid space 10 when it is conveyed via the right-hand separating plate 8 arranged at a large angle of attack , Before the soiled filter fleece 14 is wound onto the winding reel 52, the filter cake is stripped off by a wiper 82. The scraper 82 has a stripper plate 84 extending over the entire width of the filter fabric 14 and fixed to two lateral holding plates 86. A respective holding plate 86 is arranged adjacent to one of the longitudinal sides 22 and 24 of the filter container 2 and in each case has a holding hook 88 which engages behind a respective bearing axis projecting approximately perpendicular to the longitudinal side 22 and 24. The retaining hooks 88 are arranged so that acts on the holding plates 86 together with the stripper plate 84 due to its own weight a torque in the direction of the filter web 14, whereby the stripper plate 84 is pressed on this. A filter cake located on the filter fleece 14 is then stripped off during a conveying movement of the filter fleece 14 from the stripper plate 84. By an oblique arrangement of the stripper 84 of the filter cake falls on the winding reel 52 in Figure 1 right to this past for ages. The filter container 2 is downgraded from the transverse side 30 below the winding reel 52 axially approximately to the partition wall 38, whereby below the winding reel 52, a container for collecting the over the stripper plate 84 discharged filter cake can be arranged. The filter container 2 is open for this purpose below the winding reel 52 and the scraper 82.

By the cross braces 54 between the conveyor chains 16, 18 filter cake on the filter fabric 14, the plate along the obliquely arranged separating 8 is supported, held on the filter fabric 14. In this way, despite the large angle of attack of at least about 60 ° of the partition plate 8 a safe removal of the filter cake from the protective liquid space 10 allows. Figure 2 illustrates the filter device 1 in the direction of the right in Figure 1

Transverse side 30. The drive motor 76 is mounted on the right side in Figure 2 on the longitudinal side 22 from the outside to the filter container 2. On the drive shaft 56, a gear 90 is arranged, which is in operative engagement with a drive gear 76 driven by the gear 92, whereby the drive shaft 56 is rotated. The winding reel 52 also has a gear 94, which is arranged in the figure 2 below the gear 90 and a drive element 96, which is shown in Figure 1, from Gear 90 of the drive shaft 56 is driven. With increasing amount of the wound filter fabric 14 on the winding reel 52 also increases their diameter. An increasing diameter would lead to an increasing conveying speed of the filter fleece 14 with constant drive speed of the winding reel 52, for which reason an element is provided in the chain drive 90, 94, 96 in order to keep the conveying speed substantially constant. This is, for example, a slip hub. The drive shaft 56 further has to drive the conveyor chains 6, 18 in the filter container 2 drive pinion 98, 00 on. An axis of rotation 102 of the winding reel 52 is at its ends in each case via a

Double bearings 104 and 106 mounted, which is fixed outside of the filter container 2 on the longitudinal side 22 and 24 respectively.

The inlet pipe 20 is connected approximately centrally to the deflection channel 49 having the inlet channel 78. The intake manifold 80 has a slightly smaller width than the width of the filter container 2 between the longitudinal sides 22, 24th

FIG. 3 reveals a plan view of the upper side 26 of the filter device 1 from FIG. 1. The supply roll 48 of FIG. 1 is supported on a bearing shaft 104 which projects laterally from the longitudinal sides 22, 24 of the filter container 2.

It would also be conceivable to form the filter fleece 14 from FIG. 1 as an endless belt, which is then arranged, for example, circumferentially along the conveyor chains 16, 18. The guide roller 49 may also be a bent plate or a tubular body.

Disclosed is a filter device, in particular a trapezoidal well filter, for coolants or lubricants. This has a filter container in which several partition plates are arranged between two longitudinal sides. These form together with the long sides of a dirty liquid space. In the partition plates are doing a Introduced plurality of openings, which are covered by a filter, and over which the liquid to be filtered can flow from the dirty liquid space to a clean liquid space. The separating plates are arranged such that a comparatively high liquid column of a liquid to be filtered can be formed in the dirty liquid space. ^■

LIST OF REFERENCES

1 filter device

2 filter containers

4 separating plate

6 separating plate

8 separating plate

10 dirty fluid space

12 clean fluid chamber 14 filter fleece

16 conveyor chains

18 conveyor chains

20 inlet pipe

22 long side

24 long side

26 top

28 transverse side

30 transverse side

32 bottom side

34 partition

36 room section

38 partition

40 room section

42 room section

44 connecting plate

46 Connecting plate

48 supply roll

49 pulley

50 pulley

52 winding reel

53 fleece flow switch Cross struts Drive shaft Guide plate Float switch Guide rod Float Slide rails Slide rails Slide rails Guide plate Guide plate Drive motor Inlet channel Infeed distributor Scraper

Stripper plate holding plate retaining hook

gear

Drive element Drive pinion Drive pinion Rotary axis

bearing axle

Claims

Filter device, in particular a trapezoidal trough filter, for coolants and/or lubricants, with a filter container (2) in which a plurality of separating plates (4, 6, 8) are arranged between two long sides (22, 24), the long sides (22, 24) together with the separating plates (4, 6, 8), delimit a dirty liquid space (10), which is connected to a clean liquid space (12) via openings in at least one separating plate (4, 6, 8) covered by a filter (14), characterized in that the separating plates (4, 6, 8) are arranged in such a way that a comparatively high liquid column of a liquid to be filtered that is optimized with regard to a filter effect can be formed in the dirty liquid space (10).

Filter device according to claim 1, wherein a height of the liquid column of at least 500 mm is provided.

Filter device according to claim 1 or 2, wherein the filter is a filter fleece (14) which is displaceable on the dirty liquid chamber side via two circulating conveyor chains (16, 18) arranged approximately parallel to the long sides (22, 24) of the filter container (2) and at a parallel distance from one another is fixed in sections on the separating plates (4, 6, 8), and the filter fleece (14) is transported from the conveyor chains (16, 18) from a supply roll (48) via the separating plates (4, 6, 8) to a winding reel (52 ) is eligible for funding.

Filter device according to one of the preceding claims, wherein in the filter container (2) a lower and two side separating plates (4, 6, 8), in a longitudinal section view of the filter device, are arranged approximately trapezoidal, the lower separating plate (6) being approximately horizontal and the first lateral partition plate (4) extend approximately vertically and wherein the second lateral - the last in the conveying direction of the filter fleece - separating plate (8) is inclined away from the first separating plate (4) with an angle of attack of at least approximately 60 ° to a horizontal plane.

Filter device according to claim 3 or 4, wherein a plurality of cross struts (54) extending approximately parallel to one another are arranged between the conveyor chains (16, 18).

Filter device according to one of the preceding claims, wherein in at least two separating plates (4, 6, 8), in particular in a side separating plate (4, 8), in particular in all separating plates (4, 6, 8) there are openings for connecting the dirty liquid space (10). with the pure liquid space (12) are introduced.

Filter device according to one of claims 3 to 6, wherein the conveyor chains (16, 18) on the side facing away from the filter fleece (14) in the transition area of the separating plates (4, 6, 8) with a curved guide plate (73, 74) and along the separating plates (4, 6, 8) are guided in sections with slide rails (66, 68, 70).

Filter device according to claim 7, wherein the conveyor chains (16, 18) are subjected to a spring force in the direction of the filter fleece (14) via the slide rails (66, 68, 70).

Filter device according to one of claims 3 to 8, wherein the conveyor chains (16, 18) are guided in the return between the side separating plates (4, 8) around a guide plate (58) arranged in the dirty liquid space (10), a float switch (60) for Measuring the liquid column is arranged above the guide plate (58).

10. Filter device according to one of claims 3 to 9, wherein drive elements (76, 90, 92, 94) for driving the conveyor chains (16, 18) and the winding reel (52) are arranged on a longitudinal side (22) of the filter container (2). .

11. Filter device according to one of claims 3 to 10, wherein a deflection roller (49) is provided for deflecting the conveyor chains (16, 18) and the filter fleece (14) onto the first lateral partition (4), wherein in the deflection roller (49) an inlet channel connected to the dirty liquid space (10) is formed for the liquid to be filtered.

12. Filter device according to one of claims 3 to 11, wherein a scraper (82) is provided with a holding hook (88), which engages behind a bearing axis attached to the filter housing (2) and, by its own weight, with a scraper plate (84) on a surface of the Filter fleece (14) is pressed to strip off a filter cake.