WO2010022842A1 - Pressure worm separator having a hollow worm shaft - Google Patents

Abstract

The invention relates to a pressure worm separator (1) for deposition solid components from a slurry comprising solid and liquid components, such as wastewater from municipal, industrial, or agricultural operations, liquid manure, etc., comprising a housing (2) having a filling area (3) comprising an inlet (4) for the slurry, a stopper area (5) comprising an outlet (6) for the solid components and a precipitation area (7) comprising a drain (8) for the liquid components, a drive unit (9), and a pressure worm (11) driven by means of the drive unit (9), the pressure worm (11) comprising a hollow worm shaft (13), characterized in that the drive unit (9) is disposed at least partially inside the hollow worm shaft (13).

Description

 PRESSURE CHECKER WITH A HOLLOWED SNAKE SHAFT

description

The invention relates to a press screw separator for the separation of solid components from a slurry containing solid and liquid components, such as waste water from municipal, industrial or agricultural enterprises, manure, pulp, etc. The invention relates in particular to a compact, small-sized press screw separator.

Known from the prior art is a press screw separator (EP 0 367 037 B1), in which a einwendelige press or screw conveyor is operated in a horizontally oriented position and an annular space between the screw shaft and a screen basket and dimensioned in a certain way. In this known Pressschneckenseparator a motor and a gear outside the press screw separator are flanged to the press screw. Furthermore, the press screw extends horizontally. Thus, this prior art screw extruder is relatively bulky and takes up a great deal of space in its installation. It is an object of the present invention to provide a press screw separator which, in a simple, inexpensive and compact construction, effectively deposits solid components from a slurry containing solid and liquid components.

This object is achieved by the independent claim 1. The subclaims show advantageous refinements of the invention.

Thus, the invention is achieved by a press screw separator for separating solid components from a slurry containing solid and liquid components, such as sewage from municipal, industrial or agricultural operations, manure, etc., comprising a housing with a filling area, which has a feed for the pulp, a plug portion having an outlet for the solid constituents and a separation area having a discharge for the liquid constituents, a drive unit, and a press screw driven by the drive unit. Wherein the press screw has a hollow worm shaft, and wherein the drive unit is at least partially disposed within the hollow worm shaft. Characterized in that the drive unit according to the invention is at least partially disposed within this hollow screw shaft, the press screw separator according to the invention is very kleinbauend and the hitherto empty space within ^~ -Schneckenwelle can thus be effectively utilized. It should also be noted that the press screw can also be referred to as a screw conveyor, since the precipitated from the pulp solids is conveyed and pressed.

In an advantageous embodiment, it is provided that the drive unit further comprises a drive motor and / or a transmission. This transmission can be both within the drive motor and be flanged to this. Advantageously, when the press screw separator is mounted vertically, the drive motor sits above the transmission in order to protect the drive motor from the oil filling of the transmission. An advantageous compact design already arises when only a part of the transmission and / or a part of the drive motor are arranged within the hollow worm shaft. Particularly advantageous, in particular for a press screw separator with high power, is a planetary gear within the drive unit.

In a particularly advantageous embodiment, it is provided that the drive unit is arranged completely within the hollow worm shaft. If the drive unit comprises an electric motor and a transmission, it is thus particularly advantageous that these two components are arranged completely inside the hollow worm shaft. If the drive unit consists solely of a drive motor, e.g. a hydraulic motor, is advantageously located entirely within the hollow worm shaft. Due to the fact that the drive unit according to the invention is arranged completely inside the hollow screw groove, neither the drive motor nor the gear unit projects beyond the hollow worm shaft at its end faces.

Alternatively, it may also be advantageous that only a large part of the drive unit is arranged within the hollow worm shaft. In this case, the hollow worm shaft encloses more than half of the drive unit. In other words, if one looks at the hollow worm shaft perpendicular to its jacket surface, one sees a part of the drive unit sticking out. This is a compromise found in compact design and optimal ventilation of the drive unit.

In an advantageous embodiment it is provided that a center longitudinal axis of the press screw separator is oriented at an angle of 90 ° ± 30 ° relative to the horizontal. Thus, the press screw separator according to the invention is substantially vertical. In this case, advantageously, the filling region is located below the plug region, wherein the separating region with a sieve is located between these regions. Thus, is pressed against gravity and promoted.

Furthermore, it is advantageous that the drive unit comprises a drum motor, in particular an electrically driven drum motor, wherein the drive unit is operatively connected to an internal rotationally fixed shaft and an output surrounding the shaft. Drum motors are in a very compact design and in Multiple design available on the market and often combine the electric drive together with the necessary translation within an assembly. Alternatively, a hydraulic drive, in particular a hydraulic drum motor, advantageous.

Furthermore, it is advantageous that in the plug region, that is to say in the case of a vertically standing press screw separator in the upper region, the hollow worm shaft is rotatably mounted to the shaft of the drum motor. That is, the hollow worm shaft is supported, in particular in the radial direction with a rolling bearing, against the rotationally fixed shaft of the drum motor. As a result, no direct connection or storage of the hollow worm shaft in the plug region to the housing is necessary.

It is also advantageous that in the filling area, that is, when the press screw separator is vertical in the lower area, the shaft is mounted non-rotatably in the housing and the hollow worm shaft is mounted axially against the shaft. It is sufficient to store the non-rotatable shaft of the drum motor at one end. Advantageously, this is done with vertically standing press screw separator in the filling area, so below. As already advantageously in the plug region, the worm shaft, in particular with a roller bearing, is also mounted on the shaft of the drum motor in the filling area.

In a further advantageous embodiment, it is provided that the output of the drive unit, in particular of the transmission, is connected in the filling area via a flange with the hollow worm shaft. Alternatively, it would also be possible and advantageous to connect the drum of the drum motor, ie its lateral surface, directly or via annular intermediate elements with the inner wall of the hollow worm shaft. However, the connection via the flange, in particular on an end face of the hollow worm shaft, is particularly simple and easy to assemble.

Furthermore, it is advantageously provided that the hollow worm shaft is axially supported on the housing in the filling area via a slide bearing. Due to the two advantageous rolling bearings already described between the hollow worm shaft and the shaft of the drum motor, the hollow worm shaft is opposite to the Shaft centered. Especially in the vertical embodiment of the press screw separator according to the invention, the press screw can rotate in the housing thanks to the advantageous sliding bearing.

It is furthermore advantageous that the drive unit has a plug connection for an electrical and / or hydraulic connection in the plug region, that is to say in the case of a vertical design of the press screw separator in the upper region. It is also advantageous that the press screw can be assembled and disassembled together with the drive unit as a module. By disconnecting this connector according to the invention this module of the drive unit and press screw is only connected by the rotationally fixed receiving the shaft to the housing. Advantageously, this module now comprises at its upper end a hook and can thus be easily pulled out of this rotationally fixed receptacle.

In a further advantageous embodiment, it is provided that in the plug region, a relaxation chamber surrounding the hollow screw shaft is provided for an outgoing solid plug. As an alternative or in addition to this expansion chamber, a driver, in particular with the press screw, can be provided in this region of the press screw separator. This driver distributes the solids and conveys them into the exit. This exit is advantageously designed as a slide.

In an advantageous embodiment, it is provided that the output can be closed by a stowage flap arrangement which can be pivoted away under a certain axial force acting under an ejection direction. This leads to a compression of the solid plug and thus improved drainage.

Furthermore, it is advantageous that a sieve surrounding the press screw and supported against the housing is arranged in the separation area.

In a further advantageous embodiment, the hollow worm shaft is at least partially surrounded by a spiral screw. Advantageously, at least two spiral flights are provided so that the pressing forces act axially. For large-capacity auger separators, up to eight augers are advantageous in order to distribute the axial forces more evenly over the supporting elements.

Furthermore, it is advantageous that an annular space is defined at least between an inner side of the screen and a lateral surface of the worm shaft. Whereby it is particularly advantageous that the screen is cylindrical and has an inlet facing inlet side opening at an end face, wherein the screw helix starts at least one pitch before the inlet side opening of the wire and has a constant pitch. In this case, a spiral edge of the screw spiral is guided in front of the inlet-side opening of the screen to the housing, and the spiral edge in the screen is guided to close to the inside of the screen. Due to the fact that the spiral edge terminates almost flush with the housing in the filling area, the turbidity can be effectively conveyed from the filling area to the sieve or separating area. In the separation area there is a small distance between the helix edge and the wire to ensure a certain flexibility of the wire.

It is also advantageous that the screen is designed as a screen basket, in particular as a slotted screen with axially parallel rods. As a result, the screen forms a stable modular unit and can be easily assembled and disassembled.

This results in the following five advantageous sections of the screw extruder:

The first section (part of the filling area) is used to fill the machine. In order to avoid blockages, spiral flights are located in the entire area. In an advantageous embodiment, vibrations can be introduced here to reduce the viscosity.

The second section (part of the separation zone) is defined by the annulus in which the screen is placed around the screw flights. Here, the solid concentrates on so that the press screw in the axial direction can build a pressing force in the solid. The length of this section is from the properties of the pulp and the solids contained therein. The higher the viscosity (eg cattle slurry), the longer this section has to be. At low viscosity (eg pulp, paper), too long a section causes blockages.

The third section (part of the separation zone) is defined by the annulus formed by the hollow worm shaft and screen without helical coil. At the beginning of the third section, the largest axial pressing forces occur and intensive dewatering occurs, but subsequently decreases rapidly, so that the screen does not need to be carried out much longer.

The fourth section is at the beginning of the plug area. Here, the annular space defined by the worm shaft without screw helix limited by a cylindrical mouthpiece (part of the housing). The plug thus forms in the third and fourth sections. The length of this prog can affect the degree of dewatering of the solid.

In the fifth section, after the formation of the plug, either in the solid matter fluctuating states are compensated by a weighted ejection controller or a scraper arranged on the screw shaft ensures the discharge of the solid.

In an advantageous embodiment, the following sizes and proportions are provided:

In a small version of the press screw separator, a ratio between screw shaft diameter and annular gap of 1.46 is advantageous. Particularly advantageous sizes are: Worm shaft diameter 110 mm, sieve diameter 260 mm, annular gap 75 mm.

In a large version of the press screw separator, a ratio between screw shaft diameter and annular gap of 2.21 is advantageous. Particularly advantageous sizes are: screw shaft diameter 210 mm, screen diameter 400 mm, annular gap 95 mm. In high performance design, there is a ratio between

Worm shaft diameter and annular gap of 11, 9 advantageous. Particularly advantageous sizes are: Worm shaft diameter 890 mm, sieve diameter 1040 mm, annular gap 75 mm.

In the version with drum motor, a ratio between worm shaft diameter and annular gap of 3.20 is advantageous. Particularly advantageous sizes are: Worm shaft diameter 160 mm, sieve diameter 260 mm, annular gap 50 mm.

The invention will be explained in more detail with reference to two embodiments and the accompanying drawings. Showing:

1 is a sectional side view of a Schneckenwelle with cut screw shaft according to the invention according to a first embodiment,

FIG. 2 shows a detailed view of a plug region from FIG. 1, FIG.

3 is a detail view of a filling region of FIG. 1,

4 shows a further sectioned side view of the inventive screw worm separator with uncut worm shaft according to the first embodiment,

5 is a side view of the press screw separator according to the invention according to the first embodiment,

6 is a plan view of the press screw separator according to the invention according to the first embodiment,

Fig. 7 is a sectional plan view of the press screw separator according to the invention according to the first embodiment, and 8 shows a sectional side view of a press screw separator according to the invention with a cut screw shaft according to a second embodiment.

The construction of the press screw separator according to the invention according to the embodiment will be described below with reference to FIGS. 1 to 7.

1 shows a sectional side view of the press screw separator 1 according to the invention with the press screw 11 cut open according to the first exemplary embodiment. This press screw separator 1 is essentially subdivided into a housing 2 and the press screw 11 with a length l of 900 mm, wherein the press screw 11 forms a module together with a drive unit 9. Furthermore, it is easy to see how a central longitudinal axis 17 of the press screw separator 1 is perpendicular to a horizontal 18. The press screw separator 1 thus works against gravity and can be subdivided into the following three functional groups: a filling region 3 in the lower section of the press screw separator 1, a separating region 7 in the middle, and a plug region 5 above the separating region 7.

The housing 2 is divided into a housing base body 2a, on which, connected via a first screw connection 27, an upper housing part 2b is seated. The housing base 2a extends over the separation region 7 and the filling region 3. In the filling region 3, the housing base 2a has a feed 4, which is formed as a tubular extension with a diameter d2. At the lower end of the separation region 7, the housing base body 2a has an outlet 8 designed as a tubular connection with a diameter d3. Furthermore, the housing base body 2a has a square maintenance flap 2c.

The upper housing part 2b is seated on the housing base 2a and is divided into a first cylindrical portion and a second cylindrical portion 5a, wherein a diameter of the first cylindrical portion 5b is smaller than a diameter of the second cylindrical portion 5a. As a result, the second cylindrical portion 5a forms a flash chamber 23. At the level of this Expansion chamber 23 is also an output 6, which is designed as a slide (Fig. 5).

Within the housing base 2a, a cylindrical sieve 12 extends over the entire separation region 7. This sieve 12 filters over its lateral surface and is thus permeable to liquid in the direction of the discharge 8. An annular clearance is formed between an outer side of the sieve 12 and an inner side of the housing base 2a 28. At the end faces of the sieve 12 is open and thus there is a lower, the filling area facing inlet side opening 12a and an upper, the plug region 5 facing outlet side opening 12b.

Within this housing 2 or inside the cylindrical sieve 12, the press screw 11 and the drive 9 are arranged.

The press screw 11 consists of a hollow screw shaft 13, on which a screw flight 14 is arranged. At the extreme ends in the circumferential direction of this screw helix 14, a helical edge 14a is defined. Since a first diameter d1 of the hollow worm shaft 13 is smaller than a fourth diameter d4 of the screen 12, an annular space 15 with a gap width s = V≥ (d4-d1) arises between the hollow worm shaft 13 and the screen 12. The distance between adjacent turns of the worm gear 14 is indicated as a pitch g. Furthermore, it is easy to see that the worm spiral 14 does not extend over the entire separation region 7. Rather, in the lower region of the separation region 7, a first axial section 24 is formed, in which the annular space 15 is traversed by the spiral screw 14. Above this first axial section 24 extends a second axial section 25, in which the annular space 15 is free of the worm gear 14.

Furthermore, FIG. 1 shows how the drive unit 9 is composed of a drive motor 10, designed as an electric drum motor, via a transmission 16. This drive motor 10 and this gear 16 are located over their full length within the hollow worm shaft 13. Furthermore, a shaft 19 extends through this drive unit 9, consisting of drive motor 10 and gear 16. An output 20 of the gear 16, which comprises the shaft 19, is rotatably connected in the filling area 3 via a flange 35 frontally with the hollow worm shaft 13. Die Welle 20 ist in der Füllwelle 3 angeordnet. This connection via the flange 35 is ensured by a second screw 22c.

In the plug region 5, a substantially radial bearing of the hollow worm shaft 14 takes place via a cover 21 against the shaft 19 with a first roller bearing 34, wherein the interior of the hollow worm shaft 13 is sealed with a first seal 33 on the first roller bearing 34. The lid 21 is screwed via a third screw 30 with the hollow screw helix 14. (This bearing structure is shown enlarged in FIG. 2)

Furthermore, four square drivers 29a-29d are provided in the expansion chamber 23 (FIG. 1 shows only two drivers 29a, 29c). These drivers 29a-29d are non-rotatably connected to the hollow worm shaft 13 via a connecting part 32.

In the lower area, ie in the filling area 3, the hollow worm shaft 13 is supported by the flange 35 via a sliding bearing 22 on the housing 2. For this purpose, an annular sliding lining 22a is screwed to the second screw connection 22c on the flange 35. This annular sliding lining 22a rests on a counterpart 22b, designed as an annular portion of the housing base 2a. Within the flange 35, a second roller bearing 36 is designed, which supports the hollow worm shaft 13 substantially in the radial direction to the shaft 19. For sealing the interior of the hollow worm shaft 13, a second seal 36a is provided. (This bearing structure is shown enlarged in FIG. 3)

Furthermore, the shaft 19 is formed in the lower region as a square shaft 19a to rotatably support in a shaft bearing 37. At the top of the shaft 19, an electric cable 38 protrudes from the out.

Furthermore, the press screw separator 1 has feet 39a to 39d. In Fig. 1, only two feet 39a and 39c can be seen. Thus, turbidity can be introduced into the press screw separator 1 via the feed 4. This is then conveyed through the filling area 3 in the separation area 7 and compressed at the same time. In this separation region 7, water is pressed out of the solid, with the water passing through the sieve 12 into the free space 28. From there the water continues to flow via the discharge 8 out of the screw extruder 1. Alternatively, a certain backpressure in the free space 28 can be established via a valve-controlled discharge of the water via the discharge 8 in order to regulate the separation process. In the second axial section 25 of the separation region 7 and in the first cylindrical portion 5b, a plug is optimally formed from the solid. This plug is distributed in the expansion chamber 23 by the drivers 29a-29d and leaves the press screw separator 1 via the outlet 6, designed as a chute.

The press screw 11 is rotated via the electric drive 10, which is supplied with power via the electric cable 38, and via the gear 16 and performs the conveying or pressing operation. In this case, the press screw 11 is supported on the housing 2 via the slide bearing 22. Thanks to the connecting part 32, the drivers 29a-29d are co-rotated simultaneously with the press screw 11. For maintenance, the complete unit of press screw 11 and drive 9 via a hook 26 (Fig. 4) are removed upwards out of the housing 2.

FIG. 2 shows the plug region 5 from FIG. 1 in an enlarged detail view. Furthermore, FIG. 3 shows the filling area 3 from FIG. 1 in an enlarged detail view.

Fig. 4 shows the press screw separator 1 of FIG. 1 according to the embodiment with the press screw 11 in a full view. In this illustration, now also another driver 29b can be seen. Further, a hood 31 covering the shaft 19 at the uppermost end of the press screw separator 1 is shown. On this hood 31, a hook 26 is provided. Furthermore, the marking for a section from FIG. 7 is indicated by the marking A-A in FIG. 4.

Fig. 5 shows an uncut side view of the press screw separator 1 according to the embodiment. In contrast to FIGS. 1 and 4 is the Press screw separator 1 turned here by 90 °. Thus, the discharge 8 shows out of the plane of the drawing. This makes it easy to see how the output 6 is designed as a slide. Furthermore, FIG. 5 shows two further feet 39b and 39d.

Fig. 6 also shows in uncut view the press screw separator 1 in plan view. It is easy to see how the feet 39a-39d and the drivers 29a-29d are distributed uniformly along the circumference.

Fig. 7 shows the section through the press screw separator 1 with mark A-A, as already indicated in Fig. 4. It can be seen how the screen 12 is supported in the radially outer direction against a support basket 40. This support basket 40 is in turn connected by a first holder 41a, a 120 ° offset second holder 21b and a turn offset by 120 ° third holder 21c with the housing base 2a. The first holder 41a, the second holder 41b and the third holder 41c are synonymous in construction and mode of action. By way of example, this structure will be briefly explained on the first holder 41a. The holder 41a is composed of a stop 42, welded to the support basket 40. At this stop 42 is an elastic holder member 43, which is bolted via a fourth screw 45 with a retaining plate 44 on the housing base 2a.

In the following, the second embodiment of the press screw separator 1 will be shown with reference to FIG. Identical or functionally identical parts are described in the second embodiment with the same reference numerals as in the first embodiment.

Fig. 8 shows a sectional side view of a press screw separator 1 according to the invention with a cut screw shaft 13 according to the second embodiment. This screw extruder 1 is more powerful than that of the first embodiment. Therefore, here the gear 16 is designed as a planetary gear. The drive unit 9 is supported by a stand 46 on the housing base body 2a. This stand 46 is connected by means of a fifth screw 46 a with a non-rotating portion of the transmission 16. An output of the transmission 16 is connected to a sixth screw 47a and an annular connecting part 47 connected to the inside of the worm shaft 13.

In the plug region 5 is a driver 29 e, which is attached directly to the outside of the worm shaft 13.

An overhang 10a denotes a part of the drive motor 10 which protrudes from the hollow worm shaft 13. Nevertheless, the majority of the drive unit 9 remains within the hollow worm shaft 13 and a space-saving construction is given.

Thus, the invention shows a very effective, yet compact, compact and practical screw extruder.

LIST OF REFERENCE NUMBERS

1 screw extruder

2 housings

2a Housing basic body 2b Housing upper part 2c Maintenance flap

3 filling area feeder

5 plug area exit

7 separation area

8 exhaustion

9 drive unit

10 drive motor 10a projection

11 press screw

12 sieve

12a inlet side opening 12b outlet side opening

13 hollow worm shaft

14 helix 14a helix edge

15 annulus

16 gears

17 center longitudinal axis

18 Horizontal 19 WeIIe

19a square shaft 0 output 1 cover 2 plain bearing 2a friction lining 2b counterpart 22c second screw connection

23 relaxation chamber

24 first axial section

25 second axial section

26 hooks

27 first screw connection

28 free space

29a to 29d driver

30 third screw connection

31 hood

32 connecting part

33 first seal

34 first camp

35 flange

36 second camp

37 shaft bearings

38 electric cables

39 a to 39 d feet

40 support basket

41 a to 41 c mounts

42 stop

43 elastic element

44 retaining plate

45 fourth screw connection

46 stands

46a fifth screw connection

47 annular connecting part 47a sixth screw

I length d1 to d4 first to fourth diameter g pitch / slope s gap width

Claims

claims A screw extruder (1) for separating solid components from a slurry containing solid and liquid components, such as sewage from municipal, industrial or agricultural operations, manure, etc., comprising: a housing (2) having a filling area (3) containing a feeder (4) for the Cloudy, a plug region (5) having an outlet (6) for the solid constituents and a Abscheidebereich (7), the one A discharge unit (8) for the liquid components, a drive unit (9), and a drive unit (9) driven pressing screw (11), wherein the compression screw (11) has a hollow screw shaft (13), characterized in that the drive unit (9) at least partially within the hollow Worm shaft (13) is arranged. 2. screw extruder according to claim 1, characterized in that the drive unit (9) further comprises a drive motor (10) and / or a transmission (16). 3. screw extruder according to one of the preceding claims, characterized in that the drive unit (9) is arranged completely within the hollow screw shaft (13). 4. screw extruder according to one of the preceding claims, characterized in that a central longitudinal axis (17) of the press screw separator (1) at an angle of 90 ° +/- 30 ° relative to a horizontal (18) is aligned. 5. screw extruder according to one of the preceding claims, characterized in that the drive unit (9) comprises a drum motor, wherein the drive unit (9) with an internal rotationally fixed Shaft (19) and with a shaft surrounding the output (20) is operatively connected. 6. screw extruder according to claim 5, characterized in that in the plug region (5), the hollow screw shaft (13) to the shaft (19) is rotatably mounted. 7. screw extruder according to one of claims 5 or 6, characterized in that in the filling region (3) the shaft (13) rotatably in the housing (2) is mounted and the hollow screw shaft (13) axially against the shaft (19) is mounted. 8. screw extruder according to one of the preceding claims, characterized in that the hollow screw shaft (13) in the filling region (3) via a sliding bearing (22) axially on the housing (2) is supported. 9. screw extruder according to one of the preceding claims, characterized in that the pressing screw (11) is mounted together with the drive unit (9) as a module and / or disassembled. 10. Press screw separator according to one of the preceding claims, characterized in that in the plug region (5) a hollow screw shaft (13) surrounding the expansion chamber (23) is provided for a leaking Feststoffpfropfen. 11. Press screw separator according to one of the preceding claims, characterized in that in the separation region (7) a pressing screw (11) surrounding and against the housing (2) supported sieve (12) is arranged. 12. Press screw separator according to one of the preceding claims, characterized in that the hollow screw shaft (13) is at least partially surrounded by a screw flight (14). 13. screw extruder according to claims 11 and 12, characterized in that at least between an inner side of the screen (12) and a lateral surface of the worm shaft (14) an annular space (15) is defined. 14. screw extruder according to claim 13, characterized in that the annular space (15) has a first axial portion (24) into which the screw helix (14) extends, and the annular space (15) has a second axial portion (25) of the free of the screw flight (14), wherein in particular a ratio of a first length (11) of the first axial section (24) to a second length (12) of the second axial section (25) is 3 to 4.