FULL-JACKET SCREW CENTRIFUGE

Description

[0001] The present invention relates to a solid-wall screw centrifuge according to the preamble of claim 1.

[0002] Solid-wall screw centrifuges – hereinafter also referred to synonymously as decanters – are known in various designs from the prior art. They serve to clarify and, if necessary, separate a free-flowing suspension in a centrifugal field into a discharged solid phase and one or more liquid phases.

[0003] The rotor of a decanter consists of a solid drum with a cylindrical and usually conical section, and a screw body mounted inside it. Both rotate at high speed, with the screw having a differential speed compared to the drum.

[0004] The suspension to be separated flows centrally through an inlet pipe and enters the cylindrical part of the drum, the actual separation chamber, via a distributor through the screw base. There, a circular cylindrical liquid space forms due to the prevailing centrifugal field; this space is called the pond.

[0005] Due to the density difference between the denser solid and the less dense liquid, the solid settles onto the inner wall of the drum and is conveyed by the screw to a solids outlet in the conical section of the drum, where it is discharged. Above this, the clarified liquid phase flows in the opposite direction towards an axial drum lid, which has an outlet through which it is discharged (at an overflow weir, in a skimming disc, or similar).

[0006] Of particular interest in this document is the distributor. The suspension to be fed into the decanter is introduced through the stationary feed pipe. According to the design considered in this application, the suspension is first transferred from the feed pipe into a rotating distributor – usually rotating with the screw. In the distributor, the incoming suspension or product is divided into several channels, which distribute the incoming suspension flow from the axial flow direction into several partial flows, each of which is redirected into a radial or at least substantially radial flow direction and introduced into a separation chamber of the solid-bowl screw centrifuge. A known prior art of this type is disclosed in US 3,228,592 A1.

[0007] The distributor is designed to pre-accelerate the suspension or product to the screw speed, thus reducing turbulence in the separation chamber.

[0008] Furthermore, the outflow from the distributor and the inflow into the separation chamber should occur with the lowest possible shear, so that – if a flocculant is added – segregation between the flocculant added to the suspension and the suspension itself is largely avoided. The flocculant should bind with the solid phase in the suspension so that it can be separated more effectively in the separation chamber of the solid-bowl screw centrifuge.

[0009] Furthermore, the flow conditions within the manifold should be as laminar as possible to largely prevent gas from entering the suspension. Easy assembly and disassembly for replacement purposes are always essential requirements for a manifold.

[0010] There are known publications in the prior art that deal with the optimization of the inlet openings of a distributor.

[0011] From DE 10 2012 004 544 A1, a rotating inlet pipe of a solid-bowl screw centrifuge is known, at the end of which the axial feed flow encounters a cone that acts as a flow divider. This deflects the feed flow into a rotating distributor disc. This deflection can be, for example, 90° radially or only 45°. The suspension enters the separation chamber through a multitude of specially shaped inlet openings arranged around the circumference of the screw hub. A rotating inlet pipe is structurally complex, and the integration of the numerous inlet openings into the screw hub is also technically complex and therefore labor-intensive.

[0012] From EP 3 106 230 B1 it is known to provide a number of nozzles extending outwards from the interior of a distribution chamber of a solid-jacket screw centrifuge, wherein a number of accelerator inserts are arranged on the inner surface of a screw hub and between the nozzles on the circumference, wherein the accelerator inserts are interchangeable.

[0013] A disadvantage is the multi-part nature of the accelerator inserts and the resulting complex assembly process.

[0014] For the state of the art, DE 101 20 995 A1 and EP3 320 976 A1 should also be mentioned.

[0015] Against this background, the object of the present invention is to create a solid-jacket screw centrifuge with an optimized distributor.

[0016] This task is solved using a solid-walled screw centrifuge, which serves to clarify a free-flowing suspension in a centrifugal field into a solid phase and into one or more liquid phases and has at least the following features: a) a rotor with a drum rotatably mounted about an axis of rotation and a screw arranged in the drum rotatably mounted about the axis of rotation, b) wherein the screw and the drum preferably each have a cylindrical section and a conical section, c) wherein a non-rotating feed pipe is provided for supplying the suspension to a distributor rotatable with the screw, the distributor serving to accelerate the suspension in the circumferential direction and to direct it into a separation chamber between the screw rotating during operation and the drum rotating during operation, d) wherein the distributor is inserted into a distributor chamber of the screw and has a channel system for dividing the flow of the suspension to be supplied into partial flows, e) the distributor is made in one piece, f) that the channel system of the one-piece distributor has more than two sections and / or partial channels, each of which, at least over a part of its length,preferably designed to be circumferentially closed over their entire length, characterized in that g) the distributor is made of a wear-resistant and elastic plastic material ,

[0017] This advantageously creates a solid-jacket screw centrifuge with a distributor that is easy to manufacture yet simple to assemble and disassemble.

[0018] The fact that the material from which the distributor is made is chosen in such a way that it allows or supports elastic deformation of the distributor under the influence of centrifugal force has several advantages.

[0019] In this way, the play between the outer circumference of the distributor and the inner wall of the distributor chamber can be eliminated during operation of the solid-jacket screw centrifuge by an elastic deformation of the distributor due to a centrifugal force acting on the distributor, so that during operation of the solid-jacket screw centrifuge the circumference of the distributor fits tightly against the inner wall of the distributor chamber.

[0020] The rotor is typically driven by one or two electric motors and, if necessary, a gearbox. It can be supported on one or both sides by rolling bearings.

[0021] It is particularly advantageous if the distributor is manufactured using a primary forming process. This allows even complex distributor geometries to be produced easily.

[0022] In a particularly preferred embodiment of the invention, the distributor is manufactured using a 3D printing process or a casting process. The 3D printing process, in particular, advantageously offers the possibility of easily manufacturing a distributor according to the invention with a geometry comprising multiple sections and / or partial channels, which would be difficult or costly to produce using other primary forming processes.

[0023] In a further preferred embodiment of the invention, the channel system has a conical section in the inlet direction, which is rotationally symmetrical within the distributor. This allows the distributor to be advantageously used for different inlet pipe diameters. The conical section is preferably designed as a circumferentially closed channel section.

[0024] According to a further embodiment of the invention, a cylindrical section adjoins the conical section in the inlet direction, the cylindrical section being rotationally symmetrical within the distributor. The cylindrical section is preferably circumferentially closed.

[0025] According to a further advantageous embodiment, it can be provided that a preferably dome-shaped, protruding section made of the distributor material projects into the cylindrical section and / or the conical section of the channel system, so that a ring-shaped section of the channel system is formed.

[0026] This advantageously facilitates a simple distribution of the inflow flow. The dome-like section is designed as a projection. The ring-like section is preferably designed as a circumferentially closed, ring-shaped channel section.

[0027] According to a further preferred embodiment of the invention, the dome-like, protruding section has a substantially paraboloid basic geometry and is rotationally symmetrical within the distributor. This results in an advantageously slow increase in diameter, which effectively avoids turbulence and shear in the flow.

[0028] Furthermore, according to another preferred embodiment of the invention, the cylindrical section and / or the conical section may branch into two or more partial channels in the inlet direction. The partial channels further divide the inflow of a suspension in a flow-optimized manner, i.e., while maintaining laminar flow and without shear, and thus advantageously direct it towards the separation chamber of the solid-bowl screw centrifuge.

[0029] It is also advantageous if the sub-channels continuously increase their distance radially from a symmetry axis A of the distributor in the feed direction. This ensures that the supplied suspension is continuously and thus advantageously accelerated to the rotational speed of the screw in the sub-channels.

[0030] According to a further preferred embodiment of the invention, the partial channels are provided to have a swirl or a coil which can be directed against or in the direction of rotation RR of the solid-wall screw centrifuge. This ensures that the supplied suspension is conveyed gently, i.e., while maintaining a laminar flow and without shearing or gas introduction into the suspension, towards the separation chamber, and is thereby accelerated to the rotational speed of the screw.

[0031] It can also be provided that the sub-channels have a substantially circular cross-section. This advantageously results in a flow-optimized cross-section of the sub-channels without unnecessary flow resistance.

[0032] According to a further preferred embodiment of the invention, the individual sub-channels each have a helical path or follow a helix segment with an increasing radius. The increasing radius ensures the necessary acceleration of the incoming suspension. Due to the helical shape (the helix preferably does not extend over a complete 360° turn, but only over a helix-like segment of 180° or less), the flow in the sub-channels can be easily and advantageously controlled as needed, i.e., the acceleration value can be changed.

[0033] According to one embodiment of the invention, the swirl of the partial channels is altered by mounting the distributor, which is made of an elastic material, in an axially twisted or torsioned position. This provides a simple method for changing the swirl angle during the assembly of the distributor.

[0034] According to a further preferred embodiment of the invention, the distributor has a receptacle for a tool, so that the distributor can be pulled out of the distributor chamber of the screw using the tool. This results in advantageously simple assembly and disassembly of the distributor.

[0035] According to a further embodiment of the invention, the tool and the holder can form a bayonet fitting, thus enabling a positive-locking connection between the tool and the holder. This results in advantageously simple and reliable assembly and disassembly of the distributor.

[0036] Further advantageous embodiments of the invention can be found in the remaining dependent claims and the preferred embodiment.

[0037] The invention is described in more detail below with reference to exemplary embodiments and the figures. However, the figures are to be understood as merely illustrative and do not represent the invention exhaustively. Other embodiments and equivalents of the depicted configurations are also feasible and fall within the scope of protection. Furthermore, individual features described in clauses, sentences, or paragraphs of the following description are, when considered individually, not only advantageous for the respective illustrated embodiment but can also be used more generally for other embodiments of the invention, which then incorporate these features. The figures show: Figure 1: a schematic sectional view of a solid-bowl screw centrifuge; Figure 2: a sectional view of the distribution chamber of the solid-bowl screw centrifuge made of Fig. 1 Figure 3: a cross-section of a distributor made of the Fig. 2Figure 4: a spatial view of the distributor Fig. 2 and 3 .

[0038] Fig. 1 Figure 1 shows a solid-walled screw centrifuge 1 with a rotor and a drum 2 rotatable about an axis of rotation D, in which a screw 3, also rotatable about this axis of rotation, is arranged. A drive device (not shown) serves to rotate the rotor during operation.

[0039] Radial directions perpendicular to the axis of rotation D are designated with "R".

[0040] The drum 2 and the screw 3 each have a substantially cylindrical section 4, 5 and only one conically tapered section 6, 7. The solid-wall screw centrifuge 1 serves to clarify and separate a free-flowing suspension in a centrifugal field into a solid phase SP and one or more liquid phases LP.

[0041] During operation of the solid-jacket screw centrifuge 1, the screw 3 rotates at a slightly lower or higher speed than the drum 2, resulting in a differential rotational speed between the screw 3 and the drum 2.

[0042] An axially extending central inlet pipe 8 serves to direct the material to be spun in an axial direction into a distributor 9 which is rotatable with the screw 3.

[0043] The distributor 9 thus forms part of the rotor. It serves to redirect the suspension radially outwards and to introduce it into the separation chamber 10 between the drum and the screw, and to accelerate the product in the circumferential direction of rotation to the speed of the screw. The distributor 9 is of particular interest here. It will be described in more detail below.

[0044] In the separation chamber 10, a circular cylindrical liquid space, the so-called "pond", forms due to the rotation of the drum 2 in the centrifugal field.

[0045] The depth of the pond in drum 2 is limited by a liquid discharge, which is implemented here by a weir 11. Due to the density difference between the denser solid phase SP and the less dense liquid phase LP, the solid phase SP settles on the inner wall of drum 2. Radially further inwards, the clarifying suspension liquid flows into the channel or passage formed in the sediment by a helix 31 of the screw 3 in the direction of the weir 11.

[0046] In the opposite direction to the liquid flow, the solid phase SP is conveyed by the differential movement of the screw 3, resulting from its greater or lesser speed relative to the drum 2. This movement is initially directed along the cylindrical section 4 of the drum 2 and subsequently up the conical section 6 of the drum 2. The helix 31 serves this purpose. The solid phase SP then leaves the liquid reservoir, is transported over the "dry" portion of the conical section 6 of the drum 2, and finally discharged through the solids outlet 12.

[0047] The liquid phase LP, on the other hand, flows towards the larger drum diameter at the rear end of the cylindrical section 5 of the drum 2 and is diverted there by the weir 11 - located here in the drum cover 19.

[0048] This is a two-phase separation process in which a suspension to be clarified is separated into a single solid phase (SP) and a single liquid phase (LP). Alternatively, the solid-wall screw centrifuge 1 can also be designed to separate the suspension to be clarified (S) into a single solid phase (SP) and two liquid phases (LP1, LP2).

[0049] In Fig. 2 The distributor 9 of the solid-walled screw centrifuge 1 is shown in full section. It has a preferably rotationally symmetrical, essentially cylindrical basic geometry.

[0050] Distributor 9 is designed or constructed as a single piece.

[0051] This makes it advantageously easy to assemble and disassemble. Particularly advantageous manufacturing processes are preferably used, which are explained in more detail below.

[0052] The term "one-piece" here means that distributor 9 was not manufactured by joining several parts together - not even by joining them with a material bond - but consists of only one part.

[0053] A section of the outer contour of the otherwise cylindrical basic geometry of the distributor 9 has a non-round contour 91 (see Fig. 3 ) which geometrically corresponds to a corresponding contour within a distribution chamber 32 of the screw 3. The non-circular contour 91 can be designed as a four-sided flattening, so that - as in Fig. 3The figure shows a rectangular or non-circular contour 91, which can be extended to form a rectangle. This ensures a clearly positioned and positive-locking seat for the distributor 9 in the otherwise correspondingly designed distributor chamber 32 of the screw 3. The non-circular contour 91 can also be designed differently; the essential features are the unambiguous positioning of the distributor 9 in the distributor chamber 32 and a positive fit in the sense of a torque transmission contour.

[0054] The distributor 9 can be inserted into the distributor chamber 32 of the screw 3 with a clearance fit. The clearance fit can be designed such that the play between the outer circumference of the distributor 9 and an inner wall of the distributor chamber 32 is eliminated during operation of the solid-bowl screw centrifuge 1 by an elastic deformation of the distributor 9 due to a centrifugal force acting on the distributor 9, so that during operation of the solid-bowl screw centrifuge 1 the circumference of the distributor 9 fits tightly against the inner wall of the distributor chamber 31. This results in a firm and secure fit during operation, while the distributor 9 can be easily removed or installed when the centrifuge is not in operation.

[0055] The material from which distributor 9 is manufactured is selected to allow or promote elastic deformation of distributor 9 under the influence of centrifugal force. Furthermore, the material from which distributor 9 is manufactured should be sufficiently, or ideally, wear-resistant.

[0056] Accordingly, the distributor 9 is preferably made of a wear-resistant and elastic plastic material, particularly preferably of a thermoplastic elastomer, such as polyurethane. Alternatively, the distributor 9 can also be made of another suitably wear-resistant material.

[0057] Sufficient elastic deformation can be supported by the fact that the distributor 9 has one or more cavities or recesses 92 independent of a channel system (see Fig. 2), so that the distributor 9 can expand more easily in this area, thereby reducing the play between the inner wall of the distributor comb 31 and the distributor 9 to zero due to elastic deformation of the distributor 9 caused by the action of centrifugal forces and creating a pressure.

[0058] The distributor 9 further comprises an inlet channel system 93 for dividing the flow of the incoming and through-flowing suspension. The channel system 93 extends axially from an end face of the distributor 9 in the inlet direction. The inlet pipe 8 projects axially into an opening of the distributor, which forms an inlet opening into the channel system 93.

[0059] The channel system 93 can initially have a conical section 931 in the inlet direction, which can be rotationally symmetrical within the distributor 9. The conical section 931 has a frustoconical cross-section into which the stationary inlet pipe 8 can engage, as shown here. The conical section 931 can be formed as a closed, tubular structure on its inner circumference.

[0060] A cylindrical section 932, which can also be rotationally symmetrical within the distributor 9, can adjoin the conical section 931 in the inlet direction. The conical section 931 can be circumferentially closed and tubular on its inner circumference.

[0061] A projecting section 94 of the distributor material can extend into the cylindrical section in front of the end opposite the end of the inlet pipe 8. This section 94 can be dome-shaped. The dome-shaped section 94 can have a substantially paraboloid basic geometry and can be arranged rotationally symmetrically within the distributor 9.

[0062] The cylindrical section 932 of the channel system 93 is progressively transformed into a section with an annular basic geometry by this dome-shaped section 94 of the distributor 9, which projects into the cylindrical section 932. The section with annular basic geometry forms an annular channel section, which can be circumferentially closed on the inside and outside.

[0063] The cylindrical section 932, or subsequently the ring-shaped section, branches out in the inlet direction into several, here four, sub-channels 933a, b, c, d (see also Fig. 3The number of sub-channels 933a, b, c, d can vary depending on the diameter of the distributor 9 and the inlet pipe 8, as well as the viscosity of the incoming suspension S. At least two sub-channels 933 are provided. Each sub-channel can be designed as a circumferentially closed tube.

[0064] The radial distance to the axis of rotation D, which also forms an axis of symmetry A of the distributor 9, of the subchannels 933a, b, c, d increases continuously in the axial direction or in the inlet direction. They preferably run in a quasi-helical fashion.

[0065] The sub-channels 933a, b, c, d can be arranged in the manner of a section of a helix with increasing radius, or they can have a twist or turn directed against the direction of rotation RR of the solid-wall screw centrifuge 1. Alternatively, the direction of the twist or turn of the sub-channels 933a, b, c, d can also be in the direction of rotation RR.

[0066] The sub-channels 933a, b, c, d can have a substantially circular cross-section. The cross-section of the sub-channels 933a, b, c, d can also deviate from a circular shape, such as oval, kidney-shaped, or polygonal. Furthermore, it is conceivable that the cross-sections of the sub-channels 933a, b, c, d are each different or identical in pairs.

[0067] The swirl of each sub-channel 933a, b, c, d ensures that the suspension flow supplied from the inlet pipe 8 is absorbed by the rotating distributor 9 as gently as possible, i.e., without significant shearing and thus turbulence. Throughout the entire length of each sub-channel 933a, b, c, d, the flow remains largely laminar until the suspension S leaves the distributor 9.

[0068] The increasing radius of the helix also guarantees the necessary acceleration of the incoming suspension.

[0069] The helix preferably does not extend over a complete 360° helix, but only over a helical section with an angle α of 180° or less. By choosing the radius and the angle α, the flow in the sub-channels 933a, b, c, d can be easily and advantageously controlled as needed, i.e., the acceleration value can be changed. α is the angle between a jet through a reference point (e.g., the center of the cross-section) of a sub-channel 933a, b, c, d at its beginning and a jet through this reference point further along the sub-channel 933a, b, c, d. The starting point of the jets is the axis of symmetry A. L is the distance in the direction of axis A from the beginning of the sub-channel (see Figure 3 )

[0070] Depending on the viscosity of the incoming suspension S, an optimal swirl angle α is obtained. It is conceivable that the swirl angle α varies along the course of the respective sub-channel 933a, b, c, d. A in Fig. 3 The depicted swirl angle α of 45° is chosen as an example. The swirl angle α can be directed against or in the direction of rotation RR of the solid-wall screw centrifuge 1, resulting in either an acceleration or a deceleration of the suspension feed into the screw 3. Depending on the boundary conditions (viscosity, volume flow rate, flocculant, etc.), the optimum can lie in either direction. The magnitude of the optimal swirl angle α can therefore lie in the range -180° ≤ α ≤ +180°.

[0071] In one embodiment of the distributor 9, the swirl of the sub-channels 933a, b, c, d can be changed by mounting the distributor 9, which is made of an elastic material, in an axially twisted or torsioned position. This changes the swirl angle α. For this to work, the inlet side of the distributor 9 must not be positively engaged and must be fixed in a rotationally fixed position after twisting.

[0072] The partial channels 933a, b, c, d open into radial outlet openings 934a, b, c, d, which each terminate in the region of an outer surface A of the non-circular contour 91. They can also terminate in a lateral surface M of the distributor 9. The outlet openings 934a, b, c, d can also have a tangential and / or an axial directional component.

[0073] It is preferred that the distributor 9 is manufactured by a primary forming process, in particular a 3D printing process or by a casting process. This makes it possible to easily manufacture even complex internal geometries – such as the channel system 93.

[0074] The term "3D printing" refers to an additive or generative manufacturing process in which material is applied layer by layer to create three-dimensional objects (workpieces). Consequently, no tools such as molds are required to produce a workpiece.

[0075] The screw 3 can have corresponding openings 33a, b, c, d to the radial outlet openings 934a, b, c, d of the partial channels 933a, b, c, d in the distributor 9 between the distributor chamber 32 and the separation chamber 10 of the solid-bowl screw centrifuge 1. The openings 33a, b, c, d can preferably have a circular cross-sectional geometry. This allows the openings 33a, b, c, d in the screw 3 to be easily produced – e.g., by drilling. However, the openings 33a, b, c, d can also be designed in a non-circular shape.

[0076] The distributor 9 can optionally have a receptacle 95 for a tool, as shown in Fig. 4The diagram shows that the distributor 9 can be pulled out of the distributor chamber 32 of the screw 3 using the tool 13. The tool 13 can form a bayonet fitting with the receptacle 95, thus creating a positive-locking connection between the tool 13 and the receptacle 95. In case of advanced wear, the distributor 9 can therefore be easily replaced.

[0077] Existing solid-jacketed screw centrifuges can be easily and advantageously retrofitted with a distributor 9 according to the invention.

[0078] The distributor 9 pre-accelerates the suspension S to the speed of the screw 3. This is achieved by transferring the suspension S from the stationary feed pipe into the distributor 9, which is rotating at the speed of the screw.

[0079] This axial flow, or flow direction, is deflected into a radial flow within the channel system 93 inside the rotating distributor 9. When the suspension S leaves the distributor 9 and enters the pond, it has already accelerated to screw speed.

[0080] Furthermore, by dividing the incoming suspension S into flow-optimized subchannels 933a, b, c, d within the distributor 9 and by forcing the suspension S through these channels, adverse shearing is avoided. When a flocculant is used, segregation or separation of the flocculant and the solid phase SP is completely or substantially prevented.

[0081] Furthermore, the forced guidance of the suspension flows in the sub-channels 933a, b, c, d avoids random flow patterns with gas impact. Reference symbol list

[0082] 1 Solid-wall screw centrifuge 2 Drum 3 Screw 31 Helix 32 Distributor chamber 33a, b, c, d Opening 4 Cylindrical section 5 Cylindrical section 6 Conical section 7 Conical section 8 Inlet pipe 9 Distributor 91 Non-round contour 92 Recess 93 Channel system 931 Conical section 932 Cylindrical section 933a, b, c, d Partial channel 934a, b, c, d Outlet opening 94 Dome-shaped section 95 Intake 10 Separation chamber 11 Weir 12 Solids outlet 13 Tool 19 Drum lid A) Axis of symmetry D) Axis of rotation R) Radial direction M) Shell surface R) Radial direction R) Direction of rotation SSuspension SP) Solid phase LPF) Liquid phase α Twist angle L length

Claims

1. Solid bowl screw centrifuge (1) which is used to clarify a flowable suspension S in a centrifugal field into a solid phase SP and into one or more liquid phases LP and comprises at least: a) a rotor having a bowl (2) mounted to rotate about an axis of rotation and having a screw (3) arranged in the bowl (2) and mounted to rotate about the axis of rotation, b) wherein the screw (3) and the bowl (2) preferably each have a cylindrical section and a conical section, c) wherein a non-rotating feed pipe (8) is provided for feeding the suspension into a distributor which can rotate together with the screw (3), wherein the distributor (9) serves to accelerate the suspension in the circumferential direction and to guide it into a separation space between the screw (3), which rotates during operation, and the bowl (2), which rotates during operation, d) wherein the distributor (9) is inserted into a distributor chamber (32) of the screw (3) and has a channel system (93) for flow division of the suspension to be supplied, e) the distributor (9) is designed in one piece and f) that the channel system of the one-piece distributor (9) has more than two sections and / or partial channels, each of which is circumferentially closed over at least part of its length, preferably over its entire length, characterized in that g) the distributor (9) is made of a wear-resistant and elastic plastic material.

2. Solid bowl screw centrifuge (1) according to claim 1, characterized in that the distributor (9) has a rotationally symmetrical, substantially or completely cylindrical basic geometry.

3. Solid bowl screw centrifuge (1) according to claim 1 or 2, characterized in that the distributor (9) is produced by a primary forming process.

4. Solid bowl screw centrifuge (1) according to one of the preceding claims, characterized in that the distributor (9) is produced in a 3D printing process or by a casting process.

5. Solid bowl screw centrifuge (1) according to one of the preceding claims, characterized in that the distributor (9) is made of a thermoplastic elastomer, in particular of polyurethane.

6. Solid bowl screw centrifuge (1) according to one of the preceding claims, characterized in that the channel system (93) extends axially from an end face of the distributor (9) in the axial direction and merges into the radial direction.

7. Solid bowl screw centrifuge (1) according to one of the preceding claims, characterized in that the channel system (93) has a conical section (931) which is designed in a circumferentially closed and rotationally symmetrical manner to the axis of rotation in the distributor (9).

8. Solid bowl screw centrifuge (1) according to claim 7, characterized in that the conical section (931) has a circumferentially closed frustoconical cross-section in which the feed pipe (8) can engage.

9. Solid bowl screw centrifuge (1) according to claim 7 or 8, characterized in that the conical section (931) is adjoined in the feed direction by a cylindrical section (932) which is circumferentially closed and which is arranged rotationally symmetrically in the distributor (9).

10. Solid bowl screw centrifuge (1) according to claim 9, characterized in that a preferably dome-like projection-like section (94) made of material of the distributor (9) projects into the cylindrical section (932) and / or the conical section (931) of the channel system (93), so that a ring-like section of the channel system is formed, wherein the dome-like projection-like section (94) has an essentially paraboloidal basic geometry and is formed rotationally symmetrically in the distributor (9).

11. Solid bowl screw centrifuge (1) according to one of the preceding claims 9 or 10, characterized in that the cylindrical section (932) and / or the conical section (931) branches in the feed direction into at least two or more partial channels (933a, b, c, d), wherein the distance of the partial channels (933a, b, c, d) from the axis of rotation increases progressively in the feed direction.

12. Solid bowl screw centrifuge (1) according to claim 11, characterized in that the partial channels (933a, b, c, d) run in the manner of a section of a helical line with an increasing radius, wherein the partial channels (933a, b, c, d) have a circumferentially closed and preferably round cross-section.

13. Solid bowl screw centrifuge (1) according to claim 12, characterized in that the pitch varies in the helical course of the respective partial channel (933a, b, c, d).

14. Solid bowl screw centrifuge (1) according to one of claims 12 to 13, characterized in that the twist of the partial channels (933a, b, c, d) changes in that the distributor (9) made of an elastic material is mounted in an axially turned or twisted manner.

15. Solid bowl screw centrifuge (1) according to one of claims 11 to 14, characterized in that the partial channels (933a, b, c, d) open into radial outlet openings (934a, b, c, d) which end in the region of an outer surface A of a non-circular contour (91) of the distributor (9), wherein the screw (3) has corresponding openings (33a, b, c, d) to the radial outlet openings (934a, b, c, d) of the partial channels (933a, b, c, d) in the distributor (9) between the distributor chamber (32) and the separation chamber (10) of the solid bowl screw centrifuge (1), and wherein the openings (33a, b, c, d) preferably have a circular cross-sectional geometry.

16. Solid bowl screw centrifuge (1) according to one of the preceding claims, characterized in that the distributor (9) has a receptacle (95) for a tool (13), so that the distributor (9) can be pulled out of the distributor chamber (32) of the screw (3) with the aid of the tool (13), preferably in such a way that the tool (13) forms a bayonet lock with the receptacle (95), so that a positive connection can be produced between the tool (13) and the receptacle (95).

17. Solid bowl screw centrifuge (1) according to one of the preceding claims, characterized in that the screw (3) is rotatable at a differential speed to the bowl and in that it is designed to convey solids to a solids outlet (12) at a free end of its conical section, while at least one liquid phase (LP) flows in the opposite direction in the bowl (2) towards at least one liquid outlet (11), and in that the solid bowl screw centrifuge (1) has at least one drive device for rotating the screw and for rotating the bowl.