EP2923769B1 - Outlet device of a solid bowl worm centrifuge - Google Patents

Description

Background of the Invention

The invention relates to an outlet device of a solid bowl screw centrifuge for separating a multi-phase material, which is arranged on an end wall of a centrifuge drum rotating about a longitudinal axis at an outlet opening formed in the end wall, and which comprises a deflection device for deflecting the material passed through the outlet opening in the direction of the end wall circumference , in which the deflection device has a distance element which is arranged at a distance from the longitudinal axis and along which the deflected material can be guided in the direction of the end wall circumference before it is laterally thrown off by the outlet device.

The invention further relates to the use of such an outlet device.

In general, solid bowl screw centrifuges are characterized by a rotatable centrifuge drum, which has a largely closed drum shell with a mostly horizontal axis of rotation or longitudinal axis. The centrifuge drum is rotated at a high rotational speed by means of a drive. A multiphase material to be centrifuged is introduced into the centrifuge drum by means of a mostly centrally arranged inlet tube. The multi-phase material is then subjected to a high centrifugal force by rotating the centrifuge drum, causing it to adhere to the inside Creating a drum jacket as a pond. A phase separation takes place in the material centrifuged in this way, comparatively light material in the pond migrating radially inwards as the light phase and comparatively heavy material migrating radially outwards as the heavy phase. The light phase can be discharged as a fluid radially on the inside by means of an outlet device, while the heavy phase is discharged from the centrifuge drum by means of a screw.

For example, from the DE 20 2011 110 235 U1 a liquid phase outlet connection component arranged on a drum of a decanter centrifuge is known, which has a straight channel. This channel forms a section which is arranged at a distance from a longitudinal axis of the decanter centrifuge by a section radius. The channel is arranged at an acute angle relative to an end-face drum base plate in order to deflect material to the side of the drum through an outlet opening provided in the base plate. As a result, the material emerging essentially in the axial direction from the outlet opening can be deflected laterally outwards for the purpose of energy recovery along the route element before it is at the end of the straight channel or the route at the level of the route radius from the liquid phase outlet connection - component is dropped.

Out US 2004 0072667 A1 a centrifuge with a rotatable drum is known, on the drum cover of which at least one outlet connection device for liquid phase is provided for energy recovery. Each outlet connection device comprises a tube element which has at least one or two bent tube sections or bends. The tube element can generally have pipe sections of different directions between the arcs. The last pipe section following the last bend is always circumferentially directed against a direction of rotation of the drum.

Out JP 4 111 97548 A a solid-liquid centrifuge separator with a rotatable drum and an associated drum lid is known. In the drum lid arc-shaped outlet holes are provided, from which separated water can emerge from the drum via a weir plate. In addition, many blade plates protruding from the drum cover and spaced apart from one another in the circumferential direction are arranged at the radially outer end of the drum cover. During operation, part of the water emerging from the outlet holes collides with the blade plates. This means that part of the energy from the escaping water is recovered by means of the scoop plates for driving the drum. The other part of the water falls to the outside radially without guidance and without energy recovery with a corresponding amount of turbulence.

Underlying task

The invention has for its object to further develop generic outlet devices of a solid bowl centrifuge in order to achieve a more effective energy recovery.

Solution according to the invention

This object of the invention is achieved by an outlet device of a solid-bowl screw centrifuge for separating a multiphase material, which is arranged on an end wall of a centrifuge drum rotating about a longitudinal axis at an outlet opening formed in the end wall, and which has a deflection device for deflecting a fluid of the fluid that has passed through the outlet opening Guts in the direction of the end wall circumference, in which the deflection device has a stretch element arranged at a distance from the longitudinal axis with a deflection path along which the deflected fluid can be directed in the direction of the end wall circumference before it is laterally thrown off the outlet device, the outlet device comprises guide means according to the invention, which are arranged downstream behind the deflection section and by means of which the deflected fluid in the gravitational field of the solid-bowl screw centrifuge before being ejected from the outlet device an energetically lower position potential can be brought, the guide means being designed in such a way that the fluid guided along the deflection path can be guided, starting from the path radius, to a radially outer discharge radius before it is thrown off by the outlet device, the outlet device being by a weir radius Weir element arranged at a distance from the longitudinal axis, the discharge radius of the outlet device being greater than the weir radius, a weir edge which defines the weir radius being formed over the deflection path of the track element and defining the weir radius, the weir radius corresponding to the track radius. According to the invention, the outlet device thus comprises guide means by means of which the diverted fluid in the gravitational field of the solid-bowl screw centrifuge can be brought to an energetically lower position potential before being ejected from the outlet device. This makes it possible to additionally accelerate the deflected fluid at the outlet device before it is finally thrown off by the outlet device, which in turn increases the recoil effect on the outlet device and, in particular, can thereby improve the energy saving for driving the centrifuge drum.

The effect of the previously known outlet devices is generally based on deflecting the fluid of the material in the centrifuge drum through the outlet opening only once in the direction of the end wall circumference with the aid of the deflection devices. Here, the flow velocity of the fluid, which is directed and thrown off in the direction of the end wall circumference, depends to a large extent on the fluid throughput quantity passed through the outlet opening, since previously there was no deliberate, additionally desired acceleration of the fluid.

In the present case, however, the additional guide means succeed in deflecting the fluid at least twice on its way to a discharge edge in such a way that the effect of an additional acceleration can be achieved as a result. For the first time, the fluid is deflected at the outlet opening or shortly behind it, in order to deflect the fluid which essentially exits the centrifuge drum in the axial direction in the direction of the end wall circumference. A second time, the fluid that has already been deflected in this way and directed further towards the end wall circumference at the outlet device undergoes an additional change in direction in the radial direction of the centrifuge drum, the fluid being accelerated due to centrifugal forces acting on it before it is finally thrown off by the outlet device. This additional change of direction takes place parallel or skewed to the front wall.

The object of the invention is also achieved by a method for energy recovery on a solid-bowl screw centrifuge for separating a multiphase material located in a centrifuge drum rotating about a longitudinal axis, in which a phase of the material in the form of a fluid in the direction of the longitudinal axis through a in the end wall of the centrifuge drum formed outlet opening, in which the fluid passed through the outlet opening is deflected in the direction of the end wall circumference by means of a deflection device, and in which the fluid deflected in the direction of the end wall circumference is guided along a deflection path formed by the deflection device before it leaves the The deflecting section is laterally thrown off by the deflecting device, the method being characterized in that the fluid guided along the deflecting section after leaving the deflecting section in the gravitational field of the solid-bowl screw centrifuge onto an egg n Lower energy potential is brought before it is finally thrown off to the side by the outlet device. As a result, instead of being thrown off, the fluid is accelerated again radially to the longitudinal axis after leaving the deflection section before it is subsequently thrown off by the outlet device.

The additional acceleration effect is mainly achieved by a targeted drainage of the fluid on a radially outward-pointing fluid guide contour of the guide means, which extends between the deflection path and the discharge edge. Here, the fluid is directed to a larger radius. If a mass is brought to a larger radius in the gravity field of the solid-bowl screw centrifuge, this means that the mass is brought to a lower level of potential energy in relation to the centrifugal field without taking into account the associated peripheral speed.

This difference in potential energy can be converted in the sense of the invention into kinetic energy, as is the case here.

For this purpose, the present guide means are arranged downstream behind the actual deflection section.

Specifically, the guide means are preferably arranged downstream behind the actual deflection section in such a way that the fluid which has already been deflected is additionally accelerated radially outwards on the way to the end wall circumference by a repeated change of direction.

It goes without saying that in particular the route element and the guide means can be implemented in a variety of ways. They can be integrated into the outlet device in a structurally particularly simple manner if they are produced as a one-piece component from which the deflection device is at least partially composed. The invention is also specifically aimed at using an outlet device according to the invention on a solid bowl screw centrifuge for separating a multi-phase material with a centrifuge drum.

wobei R = Abwurfradius, r = Streckenradius, n = Anzahl der Auslassbohrungen am zugehörigen Umfang der Stirnwand, a = Vorzugsfaktor. Der Vorzugsfaktor ist vorzugsweise zwischen 1 und 6, bevorzugt zwischen 2 und 5, besonders bevorzugt zwischen 3 und 4 gewählt.In the invention, the guide means are designed in such a way that the material guided along the deflection section can be guided, starting from the section radius, to a radially outer discharge radius before it is thrown off by the outlet device. The distance radius and the throw radius preferably satisfy the equation: $$\mathrm{R}=\mathrm{r}\cdot \left(\left(\mathrm{a}/100\right)\cdot \mathrm{n}+1\right)$$

where R = throw radius, r = track radius, n = number of outlet bores on the associated circumference of the end wall, a = preferred factor. The preferred factor is preferably between 1 and 6, preferably between 2 and 5, particularly preferably between 3 and 4.

The guide means are arranged radially behind the route element in such a way that the material guided along the route can be guided, starting from the route radius defined by the route element, to a radially outer throw radius before it is thrown off by the outlet device.

Furthermore, it is advantageous if the guide means comprise an acceleration section along which the fluid between the section radius and a discharge radius of the outlet device can be accelerated. In this way, the rotation of the centrifuge drum can be more strongly supported.

While the deflection section primarily serves the purpose of deflecting the fluid in the circumferential direction, the present acceleration section primarily serves to accelerate the already deflected fluid again.

The acceleration section is arranged downstream behind the actual deflection section in such a way that the fluid which has already been deflected is additionally accelerated on the way to the outer end wall circumference by a further change in direction.

The deflection device is preferably designed such that a direction of the course of the outer contour of the deflection device changes in a transition region in which the deflection section merges into the acceleration section.

If the guide means have a discharge edge which is arranged on the end face at a distance from the longitudinal axis by a throw-off radius, the throw-off radius being greater than the radius of the path, the material can be accelerated further in the direction of the end wall circumference before it is thrown off by the outlet device. In particular, this can provide a drop edge for the redirected and subsequently accelerated material in a structurally simple manner which is arranged radially further outside than the deflection path of the route element.

If the guide means comprise a curved guide element which extends from radially further inwards to radially further outwards, the material guided in the direction of the end wall periphery can be guided radially further outwards in a particularly reliable manner before it is thrown off by the outlet device. Due to the curved guide element, the accelerated material undergoes another change of direction so that it can then be advantageously thrown off the outlet device.

A particularly good acceleration path can be created with the aid of the guide means if the guide means comprise a concave guide surface which faces the longitudinal axis. This guide surface is concave in the radial direction. Cumulatively, it can also be concave in the axial direction in order to be able to better guide the fluid.

A preferred embodiment variant provides that the outlet opening is arranged on a bolt circle with a bolt circle radius, with a discharge radius of the outlet device being greater than the bolt circle radius. As a result, a discharge edge can be arranged further radially outward, which further improves energy recovery.

A very advantageous embodiment variant provides that the outlet device comprises a weir element which is arranged at a distance from the longitudinal axis by a weir radius, with a discharge radius of the outlet device being greater than the weir radius.

In this respect, the weir element is arranged radially further inwards than the discharge edge of the outlet device, so that the material which has already been deflected can be further accelerated in the sense of the invention.

The weir element can be designed to be particularly simple in terms of construction if it is immediately realized by a contour of the deflection device.

It can be advantageous if the weir element is arranged between the deflection path of the path element and the acceleration path of the guide means.

The route element, the curved guide element and the weir element are preferably realized in one piece as a single component of the deflection device, so that the outlet device is very compact.

Furthermore, it is advantageous if the outlet device has a discharge angle α> 0 ° with respect to a tangent which affects a discharge radius of the outlet device. The tangent preferably touches the discharge radius at an intersection generated by the discharge radius and the discharge edge.

From an energetic point of view, a discharge angle of 0 ° is most effective in relation to this tangent, that is, a tangential discharge in the direction of the tangent based on the discharge radius. However, there is a risk here that jets of the fluids ejected by two outlet devices arranged directly behind one another on the bolt circle collide with one another. In this respect, it is advantageous to choose a discharge angle α> 0 °.

If the discharge angle α has a value between 1 ° and 30 °, it can be reliably prevented that the fluid jetted from the outlet device collides with another jetted fluid from another outlet device arranged on the end wall.

If the discharge angle α has an alternative value between 3 ° and 20 °, the fluid discharged by the outlet device can be discharged radially outwards in an even more reliable manner.

For the purposes of the invention, the fluid can be discharged from the outlet device even more effectively and reliably if the discharge angle α has a value between 5 ° and 15 °.

Brief description of the drawings

Fig. 1

eine Frontalansicht einer Stirnwand einer Zentrifugentrommel einer Vollmantelschneckenzentrifuge, wobei an der Stirnwand sechs Auslassvorrichtungen gemäß einer ersten erfindungsgemäßen Ausführungsform angeordnet sind,

Fig. 2

den Schnitt II - II in Fig. 1,

Fig. 3

den Schnitt III - III in Fig. 2 in vergrößertem Maßstab,

Fig. 4

eine Frontalansicht gemäß Fig. 1, wobei an der Stirnwand Auslassvorrichtungen gemäß einer zweiten Ausführungsform angeordnet sind,

Fig. 5

den Schnitt V - V in Fig. 4,

Fig. 6

den Schnitt VI - VI in Fig. 5 in vergrößertem Maßstab, und

Fig. 7

den Schnitt III - III einer Auslassvorrichtung gemäß Fig. 1 in weiter vergrößertem Maßstab.

Two exemplary embodiments of outlet devices on a solid-bowl screw centrifuge are explained in more detail below with reference to the attached schematic drawings. It shows:

Fig. 1

3 shows a frontal view of an end wall of a centrifuge drum of a solid bowl screw centrifuge, six outlet devices according to a first embodiment of the invention being arranged on the end wall,

Fig. 2

the section II - II in Fig. 1 ,

Fig. 3

the section III - III in Fig. 2 on an enlarged scale,

Fig. 4

a frontal view according to Fig. 1 , where outlet devices according to a second embodiment are arranged on the end wall,

Fig. 5

the section V - V in Fig. 4 ,

Fig. 6

the section VI - VI in Fig. 5 on an enlarged scale, and

Fig. 7

the section III - III of an outlet device according to Fig. 1 on a larger scale.

Detailed description of the exemplary embodiments

In the in the 1 to 3 The first exemplary embodiment shown is a plurality of first outlet devices 10 (numbered only by way of example) on an end wall 12 of a centrifuge drum 14 of a solid-bowl screw centrifuge 16 attached to separate a multi-phase good 18. The end wall 12 here forms an axial centrifuge drum cover. A centrifuge screw (not shown) is located within this solid-bowl screw centrifuge 16. The centrifuge drum 14 rotates in a driven state about a longitudinal axis 20, which simultaneously represents the central axis and also the axis of rotation of the centrifuge drum 14. The multiphase material 18 per se forms a pond or a liquid ring 26 on the inside of its drum jacket 24 when the centrifuge drum 14 rotates sufficiently quickly in the direction of rotation 22. The pond has a liquid level or pond radius 28 which is essentially dependent on the throughput of material 18 to be clarified in the centrifuge drum 14. A lot of material 18 to be clarified is fed into the centrifuge drum 14 per unit of time, but only a little clarified material as fluid 30 (see Fig. 3 ) per unit time, the liquid level increases and the pond radius 28 becomes smaller. If relatively more fluid 30 is removed, this liquid level drops. The liquid level of course also depends on the amount of material 18 of the heavy phase discharged per unit of time from the centrifuge drum 14, which should not be discussed here.

To discharge the fluid 30, six circular outlet openings 32 are machined in the end wall 12, through which the fluid 30 is discharged in the axial direction 34 of the longitudinal axis 20 - at a corresponding liquid level within the centrifuge drum 14. The circular outlet openings 32 thus serve for the removal or discharge of clarified material of a lighter phase in the form of the fluid 30 from the centrifuge drum 14. The circular outlet openings 32 are in this case uniformly spaced on a bolt circle 36 with a bolt circle radius 38 around the longitudinal axis 20 the end wall 12 arranged. In order to be able to discharge the fluid 30 flowing through the circular outlet openings 32 in a more controlled manner, one of the outlet devices 10 is attached to the outside of the end wall 12 in front of each circular outlet opening 32.

Each of the six outlet devices 10 comprises a deflection device 40 (here numbered only as an example) for deflecting the fluid 30, which has essentially passed axially through the outlet opening 32, so that this fluid 30 is deflected laterally in the direction 42 of the end wall circumference 44 and with respect to the longitudinal axis 20 is directed radially outward before it is thrown off the respective outlet device 10 in order to achieve energy recovery. The six deflecting devices 40 are fastened to the end wall 12 with a common retaining ring 46, each of the deflecting devices 40 being firmly screwed to the end wall 12 by means of two screws 48 (only numbered by way of example) inserted through the common holding ring 46.

The common retaining ring 46 also ensures that the fluid 30 to be deflected can only flow off laterally in the direction 42 of the end wall circumference 44 and not further in the axial direction 34. In this respect, the common retaining ring 46 on each of the outlet devices 10 forms an axial baffle plate element (not numbered here) of the respective deflection device 40 in such a way that on the respective deflection device 40 between the end wall 12 and the common retaining ring 46 a corresponding bowl-shaped guide space 50 for receiving the deflection element Fluid 30 is realized.

For guiding the deflected fluid 30 radially outward, the deflection device 40 further comprises a distance element 54 which is arranged at a distance from the longitudinal axis 20 and which defines a deflection path 56, the distance radius 52 being based on the distance between the deflection path 56 and the longitudinal axis 20 relates.

In this exemplary embodiment, the deflection device 40 immediately embodies a weir element 58, the weir edge 60 of which defines a weir radius 62 by appropriately designing the route element 54. In this respect, the weir radius 62 is also defined by the geometry of the route element 54. The axially flowing through the outlet opening 32 passes through this weir edge 60 Fluid 30 into the bowl-shaped guide space 50, from which it is deflected and directed in the direction 42 of the end wall circumference 44.

In order to further accelerate the fluid 30 guided along the deflection path 56 before it is ejected from the outlet device 10 and thereby make the energy recovery more effective, each of the outlet devices 10 according to the invention comprises guide means 64, by means of which the deflected fluid 30 in the gravitational field of the solid bowl screw centrifuge 16 before the ejection can be brought to an energetically lower position potential by the outlet device 10. Such guide means 64 can be implemented in a variety of ways.

In the present exemplary embodiments, the guide means 64 are embodied in a structurally simple manner by a curved guide element 66 which extends in the direction of the arrow 68 from radially further inwards to radially further outwards. Here, the curved guide element 66 is curved in such a way that a guide surface 70 designed in this way is concave. This concave guide surface 70 is integrated in the respective outlet device 10 in such a way that it faces the longitudinal axis 20. A fluid 30 which is forced outwards by the centrifugal forces can thus be guided particularly advantageously.

In particular, the curved guide element 66 is designed in such a way that the fluid 30 guided along the deflection section 56 can be guided, starting from the section radius 52 defined by the section element 54, to a radially outer discharge radius 72 before it is ejected from a discharge edge 74 of the respective outlet device 10 becomes. The section radius 52 and thus also the deflection section 56 are thus arranged radially further inwards than the discharge edge 74.

The curved guide element 66 here forms an acceleration path 76 (see in particular Fig. 3 ), by means of which the fluid 30 between the deflection section 56 and the discharge radius 72 is accelerated. This acceleration distance 76 is here - viewed in the direction of the end wall circumference 44 - arranged behind the deflection section 56 of the section element 54 such that the fluid 30 guided along the deflection section 56 undergoes a change in direction in the direction of rotation 22 of the centrifuge drum 14 at the transition between the deflection section 56 and the acceleration section 76. The fluid 30 can thus be accelerated better by centrifugal forces which act on the fluid 30 due to the rotation of the centrifuge drum 14.

Advantageously, the deflected fluid 30 is redirected at least once more by means of the acceleration path 76, namely radially outwards and in a direction opposite to the direction of rotation 22 before it is thrown off by the outlet device 10. For this purpose, the guide element 66 is curved, as already described above. By deflecting the fluid 30 radially outward and in the opposite direction, the latter is pressed against the curved guide surface 70, so that it can be ensured that the fluid 30 is only ejected from the outlet device 10 at the discharge edge 74.

The fluid 30, which has been accelerated again, can be ejected particularly advantageously with an ejection angle α in a ejection range between 5 ° and 15 °, which is provided here on each of the outlet devices 10. In the present case, the discharge angle α relates to a tangent 78, which affects the discharge radius 72 at an intersection 80 of the discharge radius 72 and the discharge edge 74. The discharge area also depends on the speed of rotation of the centrifuge drum 14.

Especially according to the representation according to Fig. 3 it can be seen very clearly that the fluid 30 after its deflection in the direction 42 of the end wall circumference 44 at the height of the weir radius 62 has the velocity vu. By directing the fluid 30 down to the larger discharge radius 72, the fluid 30 in the gravitational field of the solid-bowl screw centrifuge 16 is at a level there with a lower one potential energy. The higher potential energy inherent in the fluid 30 at the height of the weir radius 62 or at the level of the distance radius 52 was converted into kinetic energy along the acceleration path 76 of the guide means 64, so that the fluid 30 with the ejection speed va> vü on the ejection radius 72 of the respective outlet device 10 is dropped. The fluid 30 is guided during the guiding along the curved guide element 66 from the weir radius 62 located further inwards or the radius 52 of the route to the discharge radius 72 located further outside.

The second, in the 4 to 6 In the embodiment shown, alternative outlet devices are installed on the end wall 12 described above. In this respect, components of the two exemplary embodiments, which at least essentially correspond in terms of their function, are identified by the same reference numerals, the components need not be numbered and explained in all the figures. With regard to the second exemplary embodiment, reference is made to the above explanations of the first exemplary embodiment in order also to avoid repetitions.

How now according to the representations after the 4 to 6 , in which the alternative outlet devices 110 are shown, can be clearly seen, it may alternatively be more favorable to deflect the fluid 30 in front of the actual weir edge 60 instead of deflecting the fluid 30 on or behind the weir radius 62. With this, the deflection of the fluid 30 takes place already at a low flow velocity vf, whereby a deflection of the fluid 30 can be achieved with less losses due to turbulence. When flowing over the weir edge 60, the fluid 30 is then increased to the speed vu. By directing the fluid 30 to the radially outer throwing radius 72, analogous to that in FIGS 1 to 3 shown embodiment and the related previous description, the discharge speed va reached.

Except for the differently designed weir edge 60 and the route element 54 of the alternative outlet device 110, both exemplary embodiments are essentially identical in construction.

Further advantages with regard to the two outlet devices 10 and 110 can be achieved if, for example, the weir radius 62 can be variably set by a radially displaceable design of the weir element 58, for example with the aid of eccentric discs (not shown here).

In addition, in order to make it easier to mount the outlet devices 10 and 110 on the end wall 12, the respective deflection device or the relevant route element 54 and / or the guide means 64 and the common retaining ring 46 could be firmly attached to one another before the respective outlet device 10 or 110 was installed get connected.

Depending on the preferred embodiment, the effective weir edge 60 can lie in a plane parallel to the end wall 12 (see first exemplary embodiment, 1 to 3 ), in a plane which is arranged perpendicular to the end wall 12 (see second exemplary embodiment, 4 to 6 ) or at an angle between 0 ° and 90 °.

At the in Fig. 7 illustrated outlet device 10 can be seen how it is preferably designed in detail. The outlet device 10 is formed with the deflection device 40 and the plate-shaped weir element 58, which is mounted with the screws 48 in a fixed manner in bores of the weir element 58 or adjustable in elongated holes of the weir element 58 on the associated end wall 12 of the centrifuge drum 14. The centrifuge drum 14 rotates in the direction of rotation 22. The weir edge 60, which defines the weir radius 62, is formed with the weir element 58 over the deflection section 56 of the section element 54. In the present case, the weir radius 62 corresponds to the line radius 52, the line radius 52 advantageously also being slightly larger than the weir radius 62 can be, so that the clarified material or fluid flows over the weir edge 60 in the form of a small hurdle or hill. The guide element 64, with its curved guide element 66, adjoins the route element 54 counter to the direction of rotation 22. The curved guide element 66 has a convex section at the transition to the deflection section 56, which is formed with a radius r1. This is followed by the guide surface 70, which is designed as a concave section with a radius r2. The two radii r1 and r2 preferably have a ratio r1: r2 of 1: 1.5 to 1:10, preferably 1: 2 to 1: 6, particularly preferably 1: 2.5 to 1: 3.5.

Reference list

10th

Exhaust device

12th

Front wall

14

Centrifuge drum

16

Solid bowl screw centrifuge

18th

multi-phase good

20

Longitudinal axis

22

Direction of rotation

24th

Drum jacket

26

Liquid ring

28

Pond radius or liquid level

30th

Fluid

32

Outlet opening

34

axial direction

36

Bolt circle

38

Pitch circle radius

40

Deflection device

42

direction

44

End wall circumference

46

Retaining ring

48

Screws

50

Control room

52

Line radius

54

Route element

56

Deflection path

58

Weir element

60

Weir edge

62

Weir radius

64

Leadership resources

66

curved guide element

68

Arrow direction

70

Leadership area

72

Throwing radius

74

Discharge edge

76

Acceleration distance

78

tangent

80

Intersection

110

alternative outlet device

r1

radius

r2

radius

Claims (8)

1. An outlet device (10; 110) of a solid bowl screw centrifuge (16) for separating a multi-phase material (18), which outlet device is arranged on an end wall (12) of a centrifuge drum (14), which rotates about a longitudinal axis (20), at an outlet opening (32) arranged in the end wall (12), and which comprises a deflecting apparatus (4) for deflecting a fluid (30) of the material (18) that has passed through the outlet opening (32) in the direction (42) toward the end wall circumference (44), in which the deflecting apparatus (40) has a distance element (54) having a deflecting distance (56), which distance element is arranged to be spaced from the longitudinal axis (20) by a distance radius (52), along which deflecting distance the deflected fluid (30) can be conducted in the direction toward the end wall circumference (44) before being thrown off laterally by the outlet device (10; 110),
   wherein the outlet device (10; 110) comprises guiding means (64) arranged downstream behind the deflecting distance (56), and by means of which the deflected fluid (30) can be brought to an energetically lower positional potential in the gravitation field of the solid bowl screw centrifuge (16) before being thrown off by the outlet device (10; 110),
   wherein the guiding means (64) are configured such that the fluid (30) conducted along the deflecting distance (56) can be guided starting from the distance radius (52) to a throw-off radius (72) situated radially further outward, before being thrown off by the outlet device (10; 110),
   wherein the outlet device (10; 110) comprises a weir element (58) arranged to be spaced from the longitudinal axis (20) by a weir radius (62), wherein the throw-off radius (72) of the outlet device (10; 110) is larger than the weir radius (62),
   wherein a weir edge (60) is formed by means of the weir element (58) over the entire deflecting distance (56) of the distance element (54), which weir edge defines the weir radius (62), wherein the weir radius (62) corresponds to the distance radius (52).
2. The outlet device (10; 110) according to claim 1,
   characterized in that the guiding means (64) comprise an accelerating distance (76) along which the fluid (30) can be accelerated between the distance radius (52) and the throw-off radius (72) of the outlet device (10; 110).
3. The outlet device (10; 110) according to any one of claims 1 to 2,
   characterized in that the guiding means (64) have a throw-off edge (74), which is arranged on the end wall (12) to be spaced from the longitudinal axis (20) by a throw-off radius (72), wherein the throw-off radius (72) is larger than the distance radius (52).
4. The outlet device (10; 110) according to any one of claims 1 to 3,
   characterized in that the guiding means (64) comprise a curved guiding element (66) extending from radially further inward to radially further outward.
5. The outlet device (10; 110) according to any one of claims 1 to 4,
   characterized in that the guiding means (64) comprise a guiding surface (70) configured to be concave, which is facing the longitudinal axis (20).
6. The outlet device (10; 110) according to any one of claims 1 to 5,
   characterized in that the outlet opening (32) is arranged on a hole circle (36) having a hole circle radius (38), wherein a throw-off radius (72) of the outlet device (10; 110) is larger than the hole circle radius (38).
7. The outlet device (10; 110) according to any one of claims 1 to 6,
   characterized in that the outlet device (10; 110), relative to a tangent (78) being tangent to a throw-off radius (72) of the outlet device (10; 110), has a throw-off angle of α > 0°, wherein the throw-off angle α has a value of between 1° and 30°, preferably between 3° and 20°, or particularly preferred between 5° and 15°.
8. Use of an outlet device (10; 110) according to any one of the preceding claims on a solid bowl screw centrifuge (16) for separating a multi-phase material (18) by means of a centrifuge drum (14).

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