Flushing tube of a solid-jacket screw centrifuge and solid-jacket screw centrifuge

Abstract

The invention relates to a rinsing tube (10) of a solid-jacket screw centrifuge, wherein at least one opening (12) is formed in a cylindrical wall (15) of the rinsing tube (10) and a jet deflection unit (20) is formed in the jet exit direction (SR) on the outside (11) of the rinsing tube (10) in the region of the opening (12), wherein the jet deflection unit (20) has an inner contour (22) forming an outlet channel (25) of the jet deflection unit (20), which causes a deflection of a fluid jet, in particular a liquid jet, exiting from the opening (12) in the direction of the outside (11) of the rinsing tube (10) and the outlet channel (25) is formed to be open radially inwards.

Description

[0001] The invention relates to a rinsing tube of a solid-bowl screw centrifuge, wherein at least one opening is formed in a cylindrical wall of the rinsing tube and a jet deflection unit is formed on the outside of the rinsing tube in the region of the opening in the direction of the jet exit, according to the combination of features of claim 1. Furthermore, the invention relates to a solid-bowl screw centrifuge with a rinsing tube according to the invention, according to claim 16.

[0002] It is known to design screw centrifuges with washing devices so that a screw centrifuge can be cleaned, for example, after separation processes have been carried out. Furthermore, such washing devices serve to loosen solids during spraying with wash water due to a washing effect achieved by means of the washing device. Reference is made in this context to DE 12 95 494 A by way of example. In this device, nozzles are installed in a hollow screw shaft, which are connected to a distribution chamber arranged in the screw shaft, with a supply line for the washing liquid opening into the distribution chamber.

[0003] US patent 3,854,658 A discloses a solid-jacketed screw centrifuge with a flushing tube inserted into the inlet pipe. Oversized openings serve as a means for the flushing fluid to enter the inlet pipe.

[0004] US 3,302,873 A discloses a centrifuge device in which a rinsing liquid can be guided in a channel that extends radially outward through the screw helix. For this purpose, openings are formed in the outermost region of the screw helix.

[0005] However, the washing devices and the flushing pipes connected to the inlet pipe are structurally complex. Particularly in devices used for flushing or cleaning screw bodies, the spatial constraints are so limited that a tension exists between achieving good flushing or cleaning performance on the one hand, and simple and quick assembly of the screw body assembly, which includes a flushing device, on the other.

[0006] The object of the present invention is to provide a solid-jacket screw centrifuge that offers an improved method for screw body rinsing, wherein the device should be easy to install in the space between the screw hub and the inlet pipe of a solid-jacket screw centrifuge and at the same time achieve good rinsing performance.

[0007] According to the invention, this problem is solved with regard to a rinsing tube of a solid-jacket screw centrifuge by the subject matter of claim 1 and with regard to the solid-jacket screw centrifuge by the subject matter of claim 16.

[0008] Advantageous and appropriate embodiments of the rinsing tube according to the invention for a solid-jacket screw centrifuge are specified in the dependent claims.

[0009] The terminology used in the description of this disclosure serves only to describe certain embodiments and is not to be understood as limiting the subject matter. As used in this description and the claims, the singular forms "a", "an", and "the" are to be understood as including the plural forms unless the context clearly indicates otherwise. The reverse is also true; that is, the plural forms include the singular forms. It is also understood that the term "and / or", as used herein, refers to and includes all possible combinations of one or more of the associated listed elements.It is further understood that the terms “include”, “include”, “comprise” and / or “comprehensive”, when used in the present description and the claims, specify the presence of the specified features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or groups thereof.

[0010] In the present description and claims, the terms “includes”, “comprises” and / or “comprising” may also mean “consisting of”, i.e., the presence or addition of one or more other features, steps, operations, elements, components and / or groups is excluded.

[0011] The invention is based on a first idea in which at least one opening is formed in a cylindrical wall of a rinsing tube of a solid-jacketed screw centrifuge and a jet deflection unit is formed on the outside of the rinsing tube in the area of ​​the opening in the direction of the jet exit, wherein the jet deflection unit has an inner contour forming an outlet channel of the jet deflection unit, which causes a deflection of a fluid jet, in particular a liquid jet, exiting from the opening in the direction of the outside of the rinsing tube and the outlet channel is open radially inwards.

[0012] An opening is formed in the flushing tube, particularly in the cylindrical wall of the flushing tube, so that the fluid, especially the liquid, can exit the flushing tube, particularly from an annular cavity. The annular cavity is preferably formed between an inlet pipe of a solid-jacketed screw centrifuge and the flushing tube.

[0013] After passing through the jet deflection unit, the fluid, in particular the liquid, flows into an external cavity formed between the screw hub and the flushing tube, in particular the outside of the flushing tube.

[0014] A jet deflection unit is formed on the outside of the flushing pipe in the area of ​​at least one opening. This jet deflection unit is located on the outside of the flushing pipe in the direction of jet exit. The direction of jet exit is understood to be, in particular, the direction along which the fluid, especially the liquid, exiting the opening of the flushing pipe initially exits without jet deflection.

[0015] The jet exit direction is understood to be the direction along which the fluid jet exits the opening after exiting directly. The jet exit direction is preferably the direction of the opening's central axis.

[0016] The jet deflection unit has an internal contour that forms an outlet channel. Due to the design of the outlet channel, the fluid jet, particularly a liquid jet, exiting the opening is deflected.

[0017] The deflection of the fluid jet, in particular liquid jet, exiting the opening is carried out in such a way that a deflection towards the outside of the flushing pipe is effected.

[0018] The fluid, in particular the liquid, is preferably a rinsing fluid, especially a rinsing liquid. Particularly preferably, the fluid is water.

[0019] The outlet channel of the jet deflection unit is open radially inwards. In other words, the jet deflection unit preferably has no wall that defines the radially inward boundary of the outlet channel. Due to the radially inward open design of the outlet channel, such a jet deflection unit can be provided with a correspondingly minimized installation space requirement, particularly with regard to the component height required in the radial direction. Preferably, the outer surface of the flushing tube acts as a wall that seals the radially inward boundary of the outlet channel.

[0020] This wall of the cylindrical flushing tube is thus designed as a component section that interacts with the jet deflection unit.

[0021] Preferably, the outlet channel is designed in the flow direction from a fluid inlet to a fluid outlet such that the flow cross-section of the fluid outlet is equal to or smaller than the flow cross-section of the fluid inlet. This ensures that the limitation of the fluid flow rate, particularly the liquid flow rate, is solely determined by the flow cross-section of the fluid outlet. Due to the preferred design of the flow cross-sections in the flow direction, no constriction is formed within the jet deflection unit.

[0022] The flow direction of the outlet channel is to be understood as the direction along which a fluid exiting from the opening of the flushing pipe, in particular an exiting liquid, flows within the jet deflection unit in the direction of the liquid outlet of the jet deflection unit.

[0023] Preferably, a deflection angle of at least 90°, in particular at least 100°, and especially preferably at least 120°, is formed between an opening means axis and a tangent applied to the fluid outlet of the jet deflection unit on the outside of the spray tube. Due to such a deflection angle, the fluid exits the jet deflection unit close to the outside of the spray tube.

[0024] The formation of the deflection angle is particularly evident in a cross-sectional plane that runs perpendicular to the longitudinal axis of the flushing pipe. In other words, the cross-sectional plane shows the flushing pipe in cross-section, so that the flushing pipe is visible as a ring.

[0025] A section of the outer surface of the flushing pipe, specifically a section near the opening, preferably forms a nozzle together with the jet deflection unit. The jet deflection unit itself does not need to have a complete wall in contact with the outer surface of the flushing pipe. This function is performed by an outer section of the flushing pipe.

[0026] In one possible embodiment of the invention, the outlet channel has a first width for the liquid flowing in from the opening, and a second width for the liquid flowing out of the jet deflection unit, wherein the second width is larger than the first width.

[0027] In other words, the first width at the liquid inlet of the outlet channel can be smaller than the second width at the liquid outlet of the outlet channel. Using such outlet channel widths, the height at the liquid inlet must be chosen to be larger than at the liquid outlet so that the flow cross-section at the outlet is equal to or smaller than the flow cross-section at the inlet.

[0028] It is possible that the jet deflection unit has a liquid outlet whose side walls have such a course in the direction of a liquid inlet of the jet deflection unit that a liquid outlet angle of 120° to 155°, in particular of 125° to 150°, in particular of 130° to 145°, is formed.

[0029] The liquid exit angle is particularly noticeable when the jet deflection unit is in use, as seen from above.

[0030] The liquid exit angle can also be referred to as the spray angle. By designing a jet deflection unit with such a liquid exit angle, in particular a spray angle, it is possible to design a rinsing device for a solid-bowl screw centrifuge that has a small number of nozzles.

[0031] The internal contour formed in the jet deflection unit is preferably a milled contour integrated into a plate-shaped element. The desired spray pattern of the jet deflection unit can be created using this internal contour.

[0032] The side walls extending from a liquid outlet towards the liquid inlet of the jet deflection unit are preferably the side walls of the outlet channel. Using such side walls, an outlet channel can be formed which, particularly as can be seen in a bottom view of the jet deflection unit, is essentially V-shaped.

[0033] It is possible for the side walls to be curved, at least in sections, towards the liquid outlet. This creates a kind of fanning of the outlet channel in the direction of the liquid exit. Therefore, it is possible to design a jet deflection unit with a large liquid exit angle, preferably with the angles specified above.

[0034] The outlet channel preferably has an impact section opposite the opening, wherein the bottom of the outlet channel is inclined from the impact section towards the liquid outlet of the jet deflection unit in the direction of the outside of the flushing pipe. Starting from an impact section, which can form the radially outermost point of an outlet channel in relation to the opening of the flushing pipe, an inclined bottom of the outlet channel is preferably formed so that the liquid jet can be directed towards the outside of the flushing pipe by the jet deflection unit.

[0035] In a cross-sectional plane perpendicular to the longitudinal axis of the flushing pipe, a channel angle of at most 90°, particularly at most 80°, most preferably at most 70°, and more preferably at most 60°, is preferably formed between the opening center axis and the bottom of the outlet channel. Such channel angles make it particularly easy to direct the fluid jet towards the outside of the flushing pipe after the fluid exits the opening. Preferably, such a channel angle enables the formation of a deflection angle as defined above.

[0036] In the specified cross-sectional plane, which runs perpendicular to the longitudinal axis of the flushing pipe, a cross-section of the flushing pipe is visible, so that the flushing pipe appears as a ring in this cross-section. Furthermore, using a channel angle as described, it is possible to guide the fluid jet from the fluid inlet of the jet deflection unit towards the fluid outlet of the jet deflection unit in such a way that the fluid jet exits the jet deflection unit near the outside of the flushing pipe.

[0037] Preferably, the outlet channel has a baffle section opposite the opening, wherein the bottom of the outlet channel is inclined from the baffle section towards the fluid outlet of the jet deflection unit in the direction of the outside of the flushing pipe. Such an inclination of the bottom of the outlet channel preferably causes a jet deflection within the jet deflection unit in the direction of the outside of the flushing pipe, preferably forming the aforementioned deflection angle of at least 90°.

[0038] In a particularly preferred embodiment of the invention, the jet deflection unit is designed as a plate-shaped element with a defined inner contour, wherein the plate-shaped element has a top surface, a base surface opposite the top surface, two side surfaces of the first type, and two side surfaces of the second type that are longer than the side surfaces of the first type. The base surface is partially open and rests against the outer surface of the flushing pipe, so that the outlet channel is open radially inwards relative to the jet deflection unit. Preferably, the milled contour already described above is incorporated into such a plate-shaped element.

[0039] One of the second type of side surfaces is preferably open, so that a fluid outlet is formed.

[0040] With the aid of the flushing tube designed according to the invention, a jet deflection unit in the form of a nozzle can be formed as soon as the jet deflection unit is in contact with the outside of the flushing tube, in particular is connected to the outside of the flushing tube.

[0041] The radial height of the jet deflection unit, in particular the distance between the top surface and the base of the plate-shaped element, is preferably a maximum of 7.0 mm, more preferably a maximum of 5.0 mm, and most preferably a maximum of 4.5 mm. The radial direction of the jet deflection unit is understood to be the direction extending radially outwards from the longitudinal axis of the flushing tube. Due to the design of the flushing tube according to the invention, in particular the at least one jet deflection unit, it is possible to pass a flushing tube with an attached jet deflection unit through a drum lid of a solid-jacket screw centrifuge.

[0042] In a further embodiment of the invention, the at least one jet deflection unit has at least one positioning aid. Preferably, the jet deflection unit has at least one detent element that engages in a detent opening of the flushing tube, wherein the detent element is preferably pin-shaped and the detent opening is preferably designed as a bore. In a further embodiment of the invention, the detent elements can be designed as screws, in which case the detent elements primarily fulfill a connecting and / or fastening function. If the detent elements are designed as screws, the detent openings of the flushing tube are designed as bores with internal threads.

[0043] Using such a positioning aid, in particular a locking element / locking opening combination, it is possible to position the jet deflection unit on the outside of the flushing pipe in a first manufacturing step. In this positioned position, the jet deflection unit can then be connected to the outside of the flushing pipe.

[0044] In a particularly preferred embodiment of the invention, the jet deflection unit has two locking elements, and the flushing tube has two locking openings, and / or the jet deflection unit is materially bonded to the outside of the flushing tube, in particular by means of welds.

[0045] Preferably, the at least one positioning aid, in particular the at least one locking element, especially preferably the pin-shaped locking element, extends over a base surface of one / the plate-shaped element, so that the positioning aid, in particular the locking element, in particular the pin-shaped locking element, can engage in a locking opening of the flushing tube.

[0046] In a preferred embodiment of the invention, two locking elements, in particular two pin-shaped locking elements, are provided, wherein these locking elements lie on a common line with the opening of the jet deflection unit when the jet deflection unit is connected to the flushing tube. This can ensure good force distribution within the jet deflection unit when the fluid jet strikes the outlet channel, particularly an impact section of the outlet channel, since in the latter case the locking elements are located at the level of the force acting on the outlet channel. This is particularly the case when the locking elements are designed, for example, as screws and primarily fulfill a connecting and / or fastening function.

[0047] Another possibility for designing a positioning aid is that the jet deflection unit has at least one marking. Preferably, in this case, the flushing tube, and in particular its outer surface, also has a marking. In such a case, the jet deflection unit and the marking of the positioning aid can be aligned with the marking on the flushing tube.

[0048] A locking element is understood to be, in particular, an element that projects beyond the base of the beam deflection unit. A locking element may have a shape other than a pin shape. The locking element-locking opening combination may also be designed as a tongue-and-groove combination.

[0049] In a particularly preferred embodiment of the invention, at least two openings are formed in the cylindrical wall of the flushing pipe, wherein a jet deflection unit is formed on the outside of the flushing pipe in the area of ​​the opening in the direction of the jet exit.

[0050] It is possible that the openings are formed parallel to the longitudinal axis of the flushing pipe. In such a case, the jet deflection units are also formed parallel to the longitudinal axis of the flushing pipe. This arrangement of the openings and jet deflection units allows for simple fabrication and installation, as they only need to be spaced apart along the length of the flushing pipe. This also applies to attaching the jet deflection units to the openings. The flushing pipe does not need to be rotated to make the connections, as the jet deflection units are simply positioned at the same distance from each other along the same longitudinal axis.

[0051] Alternatively, the openings can be offset from each other along the circumference of the flushing tube. Depending on the size of the flushing tube and the surroundings of the screw body, such an offset arrangement of the openings, and thus of the jet deflection units, can result in a better flushing performance and / or a consistent spray pattern from all jet deflection units. Positioning at least two jet deflection units in this way prevents, among other things, the fluid jets exiting the jet deflection units, especially the spray cones, from interfering with each other.

[0052] In one embodiment of the invention, at least two fluid outlets, in particular the at least two fluid outlets of the at least two jet deflection units, are aligned in the same direction in a cross-sectional plane that runs perpendicular to the longitudinal axis of the flushing pipe. This particularly simplifies the connection of several jet deflection units to the flushing pipe, since in this case the installer only needs to align the jet deflection units in the same way, so that no special arrangements need to be observed.

[0053] Alternatively, according to a further embodiment of the invention, at least two fluid outlets, in particular the at least two fluid outlets of the at least two jet deflection units, are oriented in opposite directions around the circumference of the flushing tube. In other words, at least one fluid outlet is oriented clockwise around the circumference, and at least one other jet deflection unit is oriented counterclockwise around the circumference. Such a positioning of at least two jet deflection units prevents the fluid jets, in particular the spray cones, emerging from the jet deflection units from interfering with each other. Thus, it is possible that, despite an accidental overlap of fluid cones, in particular spray cones, emerging from the jet deflection units, they do not interfere with each other.

[0054] The flushing tube according to the invention is particularly suitable for applications in solid-walled screw centrifuges that provide a supply of flushing fluid, especially flushing liquid, at line pressure. This line pressure is at least 3 bar.

[0055] Another aspect of the invention relates to a full-size screw centrifuge comprising a screw with a screw hub and an inlet pipe running inside the screw hub, wherein a flushing pipe surrounds at least partially the inlet pipe along its longitudinal extent. The flushing pipe is designed according to the invention.

[0056] Similar advantages arise as those already mentioned in connection with the flushing pipe according to the invention.

[0057] An inlet pipe is a tube in a solid-bowl screw centrifuge that allows the product to be fed into the drum of the solid-bowl screw centrifuge. In other words, the product to be processed is fed into the drum of the solid-bowl screw centrifuge via the inlet pipe.

[0058] Specifically, the product is fed via the inlet pipe, initially into the inlet area of ​​a screw hub. Through openings formed in the screw hub, the product to be processed or separated is conveyed into the drum interior. The flushing pipe surrounds at least part of the inlet pipe. In other words, the inlet pipe is surrounded at least partially by the flushing pipe. In a preferred embodiment of the invention, the screw hub, the inlet pipe, and the flushing pipe are arranged concentrically to the longitudinal axis of a rotor unit of the solid-bowl screw centrifuge.

[0059] Between the flushing pipe and the inlet pipe, an annular space is formed in cross-section, which serves to hold a fluid, in particular a liquid, preferably a flushing fluid, especially preferably a flushing liquid.

[0060] The invention will be explained in more detail below using exemplary embodiments with reference to the attached schematic drawings.

[0061] It shows: Fig. 1 a cross-section through a flushing pipe according to the invention with jet deflection unit; Fig. 2 a top view of a beam deflection unit; Fig. 3 a flushing pipe with attached jet deflection units in perspective view; and Fig. 4 a longitudinal section through a screw hub with inlet pipe and flushing pipe located therein.

[0062] In the following, the same reference numbers are used for identical and equivalent parts.

[0063] Fig. Figure 1 shows a cross-section through the longitudinal axis of a rinsing tube 10 of a solid-bowl screw centrifuge with a jet deflection unit 20 attached to it. The rinsing tube 10 has a cylindrical wall 15 with at least one opening 12 formed therein. The jet deflection unit 20 is located on the outside 11 of the rinsing tube 10 in the jet exit direction SR. In this case, the jet exit direction SR corresponds to the opening center axis M.

[0064] The jet deflection unit 20 has an inner contour 22 that forms an outlet channel 25. The inner contour 22 deflects a fluid jet, in particular a liquid jet, exiting from the opening 12 towards the outside 11 of the flushing tube 10.

[0065] Furthermore, the outlet channel 25 is open radially inwards. In other words, the jet deflection unit 20 is not completely closed in the area of ​​the outer surface 11 of the flushing pipe 10, or rather, the jet deflection unit 20 is not completely closed on the side facing the outer surface 11 of the flushing pipe 10.

[0066] Due to the formation of the inner contour 22, which is additionally in Fig. 2 shown in a top view with a dashed line, an outlet channel 25 is formed which in the flow direction S of the outlet channel 25 from a fluid inlet 31 to a fluid outlet 33 is designed such that the flow cross-section of the fluid outlet 33 is equal to or smaller than the flow cross-section of the fluid inlet 31.

[0067] In Fig. Figure 1 also shows a deflection angle U formed between the opening center axis M and the tangent 28. The tangent 28 is located at the fluid outlet 33 on the outer surface 11 of the flushing pipe 10. The deflection angle U is at least 90°, and in particular at least 100°. Due to the deflection angle U, a flow of the fluid in the flow direction S is caused, which results in a flow towards the outer surface 11 of the flushing pipe 10.

[0068] The outer surface 11, in the area where it is covered in a radial direction R by the jet deflection unit 20, forms part of a nozzle created by the jet deflection unit 20. In the drawing, this area of ​​the outer surface 11 is represented in the cross-section shown, to the left and right of the opening 12, by a correspondingly thicker line.

[0069] In Fig. Figure 2 shows that the outlet channel 25 has a first width B1 for the fluid flowing in from the opening 12 and a second width B2 for the fluid flowing out of the jet deflection unit 20. The second width B2 is larger than the first width B1. In other words, the first width B1 corresponds to the fluid inlet 31, and the second width B2 to the fluid outlet 33.

[0070] Compared to Fig. Figure 1, which represents the jet deflection unit 20 on the cutting axis AA, makes it clear that in areas where the width of the outlet channel 25 increases, the channel height, which extends from the outside 11 to the bottom 26 of the outlet channel 25, decreases at the same time.

[0071] Again in Fig. Figure 2 shows a top view of the fluid outlet 33, which is formed with side walls 35 that curve towards the fluid inlet 31 such that a fluid outlet angle F of 130° to 145° is formed. Thus, a jet deflection unit 20 with a very large fluid outlet angle F, in particular a spray angle, is provided.

[0072] The outlet channel 25 has an impact section 30 opposite the opening 12. The impact section 30 is thus the section of the outlet channel 25 against which the fluid flowing from the opening 12 in the jet exit direction SR first impacts. The bottom 26 of the outlet channel 25 is inclined, at least from this impact section, towards the fluid outlet 33 in the direction of the outer surface 11 of the flushing pipe 10.

[0073] In the Fig. In the cross-sectional plane shown in Figure 1, which runs perpendicular to the longitudinal axis L of the flushing pipe 10, a channel angle K is shown, which is enclosed between the opening center axis M and the bottom of the outlet channel. This channel angle K is preferably at most 70°.

[0074] The beam deflection unit 20 is, as can be seen from a combined view of the Fig. 1 and Fig. As is clear, the element 40 is essentially designed as a plate-shaped element with the defined inner contour 22. The plate-shaped element 40 has a top surface 41, a base surface 42 opposite the top surface, two side surfaces of the first type 43, and two side surfaces of the second type 44. The side surfaces of the second type 44 are longer than the side surfaces of the first type 43. The base surface 42 is partially open, with the outer surface 11 of the flushing pipe 10 forming part of the nozzle created by the jet deflection unit 20 in these sections. The outlet channel 25 is open due to the partially open base surface 42.

[0075] The plate-shaped element 40 formed in this way is easy to manufacture using a milling process.

[0076] One of the side surfaces 44, in the case of the representation according to Fig. 2. The right side surface 44 is partially open, forming the fluid outlet 33. The component height BH of the jet deflection unit 20 in the radial direction R, in particular the distance between the top surface 41 and the base surface 42 of the plate-shaped element 40, is preferably a maximum of 5.0 mm. Due to such a component height BH, a flushing tube 10 with attached jet deflection units 20 can be easily inserted through an opening in the drum lid into the drum of a solid-wall screw centrifuge.

[0077] In Fig. Figure 2 further shows that the jet deflection unit 20 has two positioning aids 50. These are designed as pin-shaped locking elements that engage in locking openings (not shown) of the flushing tube 10. In this case, the locking openings are designed as bores in the cylindrical wall 15 of the flushing tube 10. Such positioning aids 50 are preferably designed as elements projecting beyond the base 42 of the jet deflection unit 20, so that these projecting positioning aids 50 can be inserted into complementary locking openings of the flushing tube 10.

[0078] The jet deflection unit 20 is preferably connected to the outside 11 of the flushing pipe 10 by means of a material bond, particularly preferably by means of welds 55.

[0079] In Fig. Figure 3 shows a further embodiment of a flushing tube 10 according to the invention. This flushing tube 10 has openings (not shown) that are formed on a line parallel to the longitudinal axis L of the flushing tube. A jet deflection unit 20 is formed on the outside 11 of the flushing tube 10 in the area of ​​the (not shown) openings, in the direction of jet exit SR.

[0080] In the illustrated embodiment, the fluid outlets 33 of the two jet deflection units 20 are aligned in the same direction as the circumferential direction UR of the flushing pipe 10.

[0081] In Fig. Figure 4 shows a section-by-section longitudinal section through a solid-wall screw centrifuge according to the invention. A screw hub 60 with a screw helix 65 attached to it is visible.

[0082] Within the screw hub 60, an inlet pipe 66 and a flushing pipe 10 according to the invention extend. Flushing fluid, in particular flushing liquid, is supplied in the annular gap 70 formed between the inlet pipe 66 and the flushing pipe 10. The flushing fluid, in particular the flushing liquid, enters the jet deflection units 20 via the openings 12.

[0083] The longitudinal section shown also indicates the bores 18 formed in the flushing pipe 10, which serve as detent openings for the positioning aids 50, which are designed in particular as pin-shaped detent elements.

[0084] Also in the Fig. In the embodiment of the invention shown in Figure 4, the openings 11 and thus the jet deflection units 20 lie on a parallel to the longitudinal axis L of the flushing pipe. REFERENCE MARK LIST 10 flushing pipe 11 Outside 12 Opening 15 cylindrical walls 18 rest opening 20 Beam deflection unit 22 Inner contour 25 Outlet channel 26 Floor 28 Tangent 30 Impact section 31 Fluid inlet 33 Fluid outlet 35 side wall 40 plate-shaped element 41 Cover area 42 square meters 43 First-type side surface 44 Second type of side surface 50 Positioning Aid 55 weld seam 60 snail hub 65 snail spirals 66 Inlet pipe 70 gap B1 first width B2 second width BH component height F Fluid outlet angle H Channel height K channel angle L Longitudinal axis Flushing pipe M Opening mechanism axis R Radial direction S Flow direction SR Beam exit direction U deflection angle UR circumferential direction

Claims

[1] A flushing tube (10) of a solid-jacket screw centrifuge, wherein at least one opening (12) is formed in a cylindrical wall (15) of the flushing tube (10) and a jet deflection unit (20) is formed in the jet exit direction (SR) on the outside (11) of the flushing tube (10) in the region of the opening (12), wherein the jet deflection unit (20) has an inner contour (22) forming an outlet channel (25) of the jet deflection unit (20), which causes a deflection of a fluid jet, in particular a liquid jet, exiting from the opening (12) in the direction of the outside (11) of the flushing tube (10) and the outlet channel (25) is open radially inwards. [2] Flushing pipe (10) according to claim 1, characterized by, that the outlet channel (25) in the flow direction (S) from a fluid inlet (31) to a fluid outlet (33) is designed such that the flow cross-section of the fluid outlet (33) is equal to or smaller than the flow cross-section of the fluid inlet (31). [3] Flushing pipe (10) according to claim 1 or 2, characterized by , that a deflection angle (U) of at least 90°, in particular at least 100°, particularly preferably at least 120°, is formed between an opening means axis (M) and a tangent (28) applied to a fluid outlet (33) of the jet deflection unit (20) on the outside (11) of the flushing tube (20). [4] Flushing pipe (10) according to one of claims 1 to 3, characterized by , that the outlet channel (25) has a first width (B1) for the fluid flowing in from the opening (12) and a second width (B2) for the fluid flowing out of the jet deflection unit (20), wherein the second width (B2) is larger than the first width (B1). [5] Flushing pipe (10) according to any of the preceding claims, characterized by , that the jet deflection unit (20) has a fluid outlet (33) whose side walls (35) in the direction of a fluid inlet (31) of the jet deflection unit (20) have such a course that a fluid outlet angle (F) of 120° - 155°, in particular of 125° - 150°, in particular of 130° - 145°, is formed. [6] Flushing pipe (10) according to any of the preceding claims, characterized by , that the outlet channel (25) has an impact section (30) opposite the opening (12), wherein a bottom (26) of the outlet channel (25) is inclined at least from the impact section (30) towards the fluid outlet (33) of the jet deflection unit (20) in the direction of the outside (11) of the flushing pipe (10). [7] Flushing pipe (10) according to claim 6, characterized by, that in a cross-sectional plane which runs perpendicular to the longitudinal axis (L) of the flushing pipe (10), a channel angle (K) of at most 90°, in particular of at most 80°, particularly preferably of at most 70°, and further preferably of at most 60°, is formed between an / the opening means axis (M) and the bottom (26) of the outlet channel (25). [8] Flushing pipe (10) according to any of the preceding claims, characterized by, that the jet deflection unit (20) is designed as a plate-shaped element (40) with a formed inner contour (22), wherein the plate-shaped element (40) has a top surface (41), a base surface (42) opposite the top surface (41), two side surfaces of the first kind (43) and two side surfaces of the second kind (44) which are longer than the side surfaces of the first kind (43), wherein the base surface (42) is partially open and abuts the outside (11) of the flushing pipe (10), so that the outlet channel (25) is open radially inwards. [9] Flushing pipe (10) according to claim 8, characterized by , that one of the second-type side surfaces (44) is partially open, so that a fluid outlet (33) is formed. [10] Flushing pipe (10) according to one of the preceding claims, in particular according to claim 8 or 9, characterized by, that the component height (BH) of the beam deflection unit (20) in the radial direction (R), in particular the distance between the top surface (41) and the base surface (42) of the plate-shaped element (40), is a maximum of 7.0 mm, in particular a maximum of 5.0 mm, and most preferably a maximum of 4.5 mm. [11] Flushing pipe (10) according to any of the preceding claims, characterized by , that the jet deflection unit (20) has at least one positioning aid (50), in particular at least one locking element which engages in a locking opening (18) of the flushing tube (10), wherein the locking element is preferably pin-shaped and the locking opening (18) is preferably designed as a bore. [12] Flushing pipe (10) according to claim 11, characterized bythat the jet deflection unit (20) has two locking elements and the flushing tube (10) has two locking openings (18) and / or the jet deflection unit (20) is materially bonded to the outside (11) of the flushing tube (10), in particular by means of a weld (55). [13] Flushing pipe (10) according to any of the preceding claims, characterized by , that at least two openings (12) are formed in the cylindrical wall (15) of the flushing tube (10) and a jet deflection unit (20) is formed in the jet exit direction (SR) on the outside (11) of the flushing tube (10) in the area of ​​the opening (12). [14] Flushing pipe (10) according to claim 13, characterized by , that - the openings (12) are formed on a parallel to the longitudinal axis (L) of the flushing pipe (10) or - are offset from each other in the circumferential direction (U) of the flushing pipe (10). [15] Flushing pipe (10) according to claim 13 or 14, characterized by, that the at least two fluid outlets (33) of the at least two jet deflection units (20) are aligned in the same or opposite directions in a cross-sectional plane perpendicular to the longitudinal axis (L) of the flushing pipe (10). [16] Solid shell screw centrifuge comprising a screw with screw hub (60) and an inlet pipe (66) which runs inside the screw hub (60), wherein a flushing pipe (10) surrounds at least section by section the inlet pipe (66) in its longitudinal extent, wherein the flushing pipe (10) is designed according to any one of claims 1 to 15.

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