Parallel flow type three-phase horizontal screw discharge decanter centrifuge

Abstract

This invention discloses a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge, comprising: a feed pipe, a first drum, a first conveying screw disposed within the inner cavity of the first drum, a centrifugal pump, a second drum, a second conveying screw disposed within the inner cavity of the second drum, an intermediate bearing seat for fixing the first drum and the second drum, and an intermediate support shaft for fixing the first conveying screw and the second conveying screw. The second drum is a conical drum. In this invention, the mixed liquid enters the first drum through the feed pipe. The heavy liquid phase, light liquid phase, and solid residue settle and separate within the first drum while moving towards the location of the second drum in the same direction, in parallel. The separated heavy liquid phase, light liquid phase, and solid residue are discharged through their respective channels. No eddies are generated during the separation and discharge processes, greatly improving the centrifuge's separation efficiency and effect.

Description

Technical Field

[0001] This invention relates to the field of solid-liquid separation equipment technology, specifically to a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge. Background Technology

[0002] Ordinary three-phase screw discharge centrifuges are generally counter-current type, and their working mechanism is as follows: Figure 1-2 As shown, specifically: the mixed liquid 01 (the raw slurry to be separated) enters the hollow shaft of the conveying screw 07 of the centrifuge from the feed pipe 02. Several feeding ports 011 are opened in the middle of the hollow shaft of the conveying screw 07. The mixed liquid 01 passes through the feeding ports 011 and enters the drum 06. Under the action of centrifugal force, centrifugal sedimentation separation is achieved. In the feeding area of ​​the centrifuge, the solid phase / light liquid phase / heavy liquid phase are initially separated from each other. The two liquid phase layers in the middle, the light liquid phase and the heavy liquid phase, flow to the large end of the drum. The solid phase that settles on the inner wall of the drum is pushed to the small end of the drum 06 by the conveying screw 07. The light liquid phase moves in the opposite direction (09) to the heavy liquid phase (010) and the solid slag moves in the opposite direction (08) (referred to as countercurrent). Both the light and heavy liquid phases flow towards the large end cap (03) of the drum (06). The heavy liquid phase flows through the heavy liquid phase channel (05) and overflows from the heavy liquid phase outlet (04) into the heavy liquid phase collection hopper (013) for discharge. The light liquid phase flows through the light liquid phase overflow outlet (018) and overflows from the light liquid phase channel (017) into the light liquid phase collection hopper (014) for discharge. The solid slag that has settled on the inner wall of the drum is pushed towards the small end of the drum (06) by the conveying screw (07) and flows into the solid slag collection hopper (012) for discharge.

[0003] The above-mentioned ordinary three-phase screw discharge centrifuge has several problems:

[0004] First, during the operation of a centrifuge, in the process of liquid clarification and slag discharge, the liquid moves towards the larger end while the solid slag moves towards the smaller end; the two move in opposite directions, hence the name "counter-current" centrifuge. In a counter-current centrifuge, the mixed liquid 01 must pass through the distribution hole 011 of the high-speed rotating conveying screw 07 before reaching the drum 06 for centrifugal separation. The mixed liquid 01 enters the "feed zone" a of the drum 06 from the distribution hole 011 at high speed, creating a powerful impact on the liquid pool inside the drum 06 and forming a vortex, causing the settled and stratified liquid and solid phases to remix. Therefore, the separation efficiency in the feed zone of the centrifuge is very low.

[0005] Secondly, because the solid sludge settling on the inner wall of the rotary drum 06 moves in the opposite direction to the liquid phase, as the sludge moves towards the smaller end of the rotary drum 06, some of the solid sludge is washed away by the liquid phase and remixed into the liquid phase. Fine fruit particles, in particular, are more easily washed away and resuspended in the liquid phase. Therefore, this reduces the centrifuge's separation efficiency and screw conveying efficiency.

[0006] Third, the centrifuge's conveying screw 07 has two supports, one at the large end and one at the small end, namely the screw large end support 015 and the screw small end support 016. When the centrifuge's length-to-diameter ratio (the ratio of the effective working length of the drum to the diameter of the large end of the drum) is greater than 4.5, the rigidity of the conveying screw will be greatly reduced because the screw supports at the two ends are too far apart. The centrifuge cannot operate at high speed, thus reducing the centrifuge's separation capacity. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention proposes a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows:

[0009] This invention discloses a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge, comprising: a feed pipe, a first drum, a first conveying screw disposed in the inner cavity of the first drum, a centripetal pump, a second drum, a second conveying screw disposed in the inner cavity of the second drum, an intermediate bearing seat for fixingly connecting the first drum and the second drum, and an intermediate support shaft for fixingly connecting the first conveying screw and the second conveying screw, wherein the second drum is a conical drum;

[0010] The liquid outlet of the feed pipe is connected to the material distribution port of the first conveying screw, which is used to transport the mixture into the first drum.

[0011] The feed end of the first conveying screw is connected to the first drum via a large end support, and the intermediate bearing seat is connected to the intermediate support shaft via an intermediate support. The first conveying screw is used to transport the light liquid phase, heavy liquid phase and solid slag in the first drum to the second drum.

[0012] The first and second drums are respectively mounted on bearing supports and can rotate under the drive of the drive device. A heavy liquid phase and solid slag channel is provided at their connection point. The heavy liquid phase and solid slag in the first drum flow into the second drum through the heavy liquid phase and solid slag channel.

[0013] The intermediate bearing housing is equipped with a heavy liquid phase channel, through which the heavy liquid phase in the second drum is discharged.

[0014] A centripetal pump is installed inside the second drum, and its inlet is located at the outlet of the first conveying screw, for discharging the light liquid phase inside the first drum.

[0015] The second conveying screw is used to transport the solid slag inside the second drum from its large diameter end to its small diameter end, and then discharge it through the solid slag outlet.

[0016] This invention discloses a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge, which has the following features:

[0017] Beneficial effects:

[0018] First, the feeding screw of the present invention adopts a segmented structure, and the first feeding screw and the second feeding screw are fixedly connected by the intermediate support shaft, which reduces the distance between the two ends of the screw, can realize the ultra-large length-to-diameter ratio of the centrifuge, improve the rigidity of the screw, and can greatly increase the maximum speed of the centrifuge.

[0019] Secondly, in terms of the installation of the conveying screws, the first conveying screw and the second conveying screw are installed inside the first drum and the second drum respectively, which reduces the difficulty of assembly.

[0020] Third, the mixture enters the first drum through the feed pipe. The heavy liquid phase, light liquid phase, and solid residue settle and separate within the first drum while simultaneously moving towards the second drum in the same direction, exhibiting parallel flow (referred to as co-current). The separated heavy liquid phase, light liquid phase, and solid residue are discharged through their respective channels. No eddies are generated during the separation and discharge processes, significantly improving the centrifuge's separation efficiency and effectiveness.

[0021] Based on the above technical solution, the following improvements can be made:

[0022] As a preferred embodiment, several material outlets are distributed on the first conveying screw near the liquid outlet of the feed pipe.

[0023] With the above-mentioned preferred solution, the feed area of ​​the first drum, located near the liquid outlet of the feed pipe, will not generate eddies in the liquid pool inside the first drum.

[0024] The feed pipe, the first drum, the first conveying screw, the centripetal pump, the second drum, the second conveying screw, the intermediate bearing housing, and the intermediate support shaft are all coaxially arranged.

[0025] As a preferred option, the tail end of the intermediate support shaft near the small diameter end of the second drum is a cantilever structure or supported by a small end support.

[0026] The above-mentioned preferred schemes offer diverse structures, allowing for design and layout tailored to specific application scenarios.

[0027] As a preferred embodiment, the centripetal pump is installed at the center of the second drum, the intermediate support shaft is sleeved around the periphery of the centripetal pump, and the radial disc of the intermediate support shaft is fixedly connected to the discharge end of the first conveying screw, while its axial cylinder is fixedly connected to the second conveying screw.

[0028] With the above-mentioned preferred scheme, the centrifuge has a robust overall structure, and the light liquid phase is discharged from the center of the centrifuge using a centrifugal pump.

[0029] As a preferred embodiment, a heavy liquid phase overflow port is formed between the radial disk of the intermediate support shaft and the feed end of the second conveying screw. The heavy liquid phase overflow port is connected to the heavy liquid phase channel and is located near the center of the second drum.

[0030] Using the above-mentioned preferred scheme, the heavy liquid phase overflow outlet is located near the center of the second drum, the central layer of the heavy liquid phase contains less solid slag, and the heavy liquid phase outlet is clearer.

[0031] As a preferred embodiment, the discharge end of the first conveying screw has a large-diameter disk, and a groove is provided on the end face of the large-diameter disk facing the second drum, with the inlet end of the centripetal pump placed in the groove.

[0032] By adopting the above-mentioned preferred scheme, the centripetal pump is installed more stably, and the centripetal pump is used to discharge the light liquid phase.

[0033] As a preferred embodiment, several through holes are formed along the axial direction on the large-diameter disk, and these through holes form a light liquid phase channel, which is connected to the inlet of the centripetal pump.

[0034] The above-mentioned preferred scheme features an ingenious design for the light liquid phase channel and a simple manufacturing process.

[0035] As a preferred embodiment, the channel between the outer wall of the large-diameter disc and the inner wall of the first drum forms part of the heavy liquid phase and solid slag channel.

[0036] The above-mentioned preferred scheme features an ingenious design for the heavy liquid phase and solid slag channels.

[0037] As a preferred embodiment, several through holes are provided on the intermediate bearing housing along its axial direction, and these through holes form part of the heavy liquid phase and solid slag channel.

[0038] Using the preferred scheme described above, the heavy liquid phase and solid slag are smoothly transferred from the first drum to the second drum through the heavy liquid phase and solid slag channel.

[0039] As a preferred embodiment, the inner wall of the through hole of the intermediate bearing housing has an inwardly protruding protrusion, and the protrusion has a first inclined surface facing the first feeding screw and a second inclined surface facing the second feeding screw.

[0040] By adopting the above-mentioned preferred scheme, the solid slag is successfully transported into the second drum. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a cross-sectional view of a conventional three-phase screw discharge centrifuge mentioned in the background art.

[0043] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0044] Figure 3 This is a cross-sectional view of a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge provided in an embodiment of the present invention.

[0045] Figure 4 for Figure 3 Enlarged view of part B in the middle.

[0046] Figure 5 for Figure 3 Enlarged view of part C in the middle.

[0047] Figure 6 for Figure 3 Enlarged view of part D in the middle.

[0048] Wherein: 01-mixed liquid, 02-feed pipe, 03-large end cap, 04-heavy liquid phase overflow outlet, 05-heavy liquid phase channel, 06-drum, 07-feeding screw, 08-solid slag movement direction, 09-light liquid phase movement direction, 010-heavy liquid phase movement direction, 011-material distribution hole, 012-solid slag collection hopper, 013-heavy liquid phase collection hopper, 014-light liquid phase collection hopper, 015-screw large end support, 016-screw small end support, 017-light liquid phase channel, 018-light liquid phase overflow outlet, a-feeding area;

[0049] 1-Infeed pipe, 11-Outlet, 21-First drum, 211-Large end cap, 22-Second drum, 221-Small end cap, 23-Intermediate bearing seat, 31-First conveying screw, 311-Distribution port, 312-Infeed end, 313-Outlet end, 314-Large diameter disc, 315-Groove, 32-Second conveying screw, 33-Intermediate support shaft, 331-Radial disc, 332-Axial cylinder, 4-Centrifugal pump, 41-Inlet, 51-Mixed liquid, 52 - Solid phase slag movement direction, 53 - Light liquid phase movement direction, 54 - Heavy liquid phase movement direction, 61 - Large end support, 62 - Intermediate support, 63 - Small end support, 7 - Bearing bracket, 8 - Drive device, 91 - Light liquid phase channel, 92 - Heavy liquid phase and solid phase slag channel, 93 - Heavy liquid phase channel, 94 - Solid phase slag outlet, 95 - Heavy liquid phase overflow outlet, 96 - Light liquid phase outlet, 97 - Heavy liquid phase outlet, 10 - Protrusion, 101 - First inclined surface, 102 - Second inclined surface. Detailed Implementation

[0050] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Using ordinal numbers such as “first,” “second,” “third,” etc. to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, sequence, or any other way.

[0053] Furthermore, the expression "includes" is an "open-ended" expression, which means only that there is a corresponding component or step, and should not be interpreted as excluding additional components or steps.

[0054] To achieve the objectives of this invention, some embodiments of the parallel-flow three-phase horizontal screw discharge sedimentation centrifuge, such as... Figure 3-5 As shown, the centrifuge includes: a feed pipe 1, a first drum 21, a first conveying screw 31 disposed in the inner cavity of the first drum 21, a centripetal pump 4, a second drum 22, a second conveying screw 32 disposed in the inner cavity of the second drum 22, an intermediate bearing seat 23 for fixing the first drum 21 and the second drum 22, and an intermediate support shaft 33 for fixing the first conveying screw 31 and the second conveying screw 32. The second drum 22 is a conical drum.

[0055] The liquid outlet 11 of the feed pipe 1 is connected to the material distribution port 311 of the first conveying screw 31, and is used to convey the mixture 51 into the first drum 21.

[0056] The feed end 312 of the first conveying screw 31 is connected to the first drum 21 via the large end support 61, and the intermediate bearing seat 23 is connected to the intermediate support shaft 33 via the intermediate support. The first conveying screw 31 is used to transport the light liquid phase, heavy liquid phase and solid slag in the first drum 21 to the second drum 22.

[0057] The first drum 21 and the second drum 22 are respectively mounted on the bearing support 7 and can rotate under the drive of the drive device 8. A heavy liquid phase and solid slag channel 92 is provided at their connection point. The heavy liquid phase and solid slag in the first drum 21 flow into the second drum 22 through the heavy liquid phase and solid slag channel 92.

[0058] The intermediate bearing housing 23 is provided with a heavy liquid phase channel 93, through which the heavy liquid phase in the second drum 22 is discharged via the heavy liquid phase channel 93 and the heavy liquid phase outlet 97.

[0059] The centripetal pump 4 is installed in the inner cavity of the second drum 22, and its inlet 41 is installed at the outlet 313 of the first conveying screw 31, for discharging the light liquid phase in the first drum 21 through the light liquid phase outlet 96.

[0060] The second conveying screw 32 is used to transport the solid slag in the second drum 22 from its large diameter end to its small diameter end, and discharge it through the solid slag outlet 94.

[0061] Wherein: the first drum 21 mentioned above may be, but is not limited to, a cylindrical drum.

[0062] The feed pipe 1, the first drum 21, the first conveying screw 31, the centripetal pump 4, the second drum 22, the second conveying screw 32, the intermediate bearing seat 23, and the intermediate support shaft 33 are all coaxially arranged.

[0063] The feed end of the first drum 21 is equipped with a large end cover 211, and the small diameter end of the second drum 22 is equipped with a small end cover 221.

[0064] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining features are the same, except that a number of fabric outlets 311 are distributed on the first conveying screw 31 near the liquid outlet 11 of the feed pipe 1.

[0065] Using the preferred scheme described above, the feed area of ​​the first drum 21 is located near the liquid outlet 11 of the feed pipe 1, which will not generate eddies in the liquid pool inside the first drum 21.

[0066] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining features are the same, except that the tail end of the intermediate support shaft 33 near the small diameter end of the second drum 22 is supported by the small end support 63.

[0067] The preferred solutions described above offer diverse structural options, allowing for design and layout tailored to specific application scenarios. In other embodiments, the tail of the intermediate support shaft 33 is a cantilever structure, eliminating the small-end support 63 and further simplifying the centrifuge's discharge end structure. Removing the small-end support 63 frees up space that can be used to further reduce the diameter of the centrifuge's discharge end, increase the depth of the sedimentation tank and the length of the dewatering zone, thereby improving the clarity and dryness of the centrifuge's effluent.

[0068] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining features are the same, except that the centripetal pump 4 is installed at the center of the second drum 22, the intermediate support shaft 33 is sleeved on the periphery of the centripetal pump 4, and the radial disk 331 of the intermediate support shaft 33 is fixedly connected to the discharge end 313 of the first conveying screw 31, and its axial cylinder 332 is fixedly connected to the second conveying screw 32.

[0069] With the above-mentioned preferred scheme, the centrifuge has a robust overall structure, and the light liquid phase is discharged from the center of the centrifuge by the centrifugal pump 4.

[0070] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining features are the same, except that a heavy liquid phase overflow port 95 is formed between the radial disk 331 of the intermediate support shaft 33 and the feed end of the second conveying screw 32. The heavy liquid phase overflow port 95 is connected to the heavy liquid phase channel 93, and the heavy liquid phase overflow port 95 is located near the center of the second drum 22.

[0071] Using the preferred scheme described above, the heavy liquid phase overflow port 95 is located near the center of the second drum 22. The central layer of the heavy liquid phase contains less solid residue, resulting in a clearer heavy liquid phase outlet. Compared to the ordinary three-phase screw discharge centrifuge mentioned in the background art, the heavy liquid phase outlet is located further away from the centrifuge center and closer to the inner wall of the drum, making it easier for the heavy liquid phase to carry away any fine residue that has not settled firmly.

[0072] In order to further optimize the implementation effect of the present invention, in some other embodiments, the remaining features are the same, except that the discharge end of the first conveying screw 31 has a large diameter disk 314, and a groove 315 is provided on the end face of the large diameter disk 314 facing the second drum 22, and the liquid inlet end of the centripetal pump 4 is placed in the groove 315.

[0073] By adopting the above-mentioned preferred scheme, the installation of centripetal pump 4 is more stable, and the centripetal pump 4 is used to discharge the light liquid phase.

[0074] Furthermore, based on the above embodiment, a plurality of through holes are provided on the large-diameter disk 314 along its axial direction, and the plurality of through holes form a light liquid phase channel 91, which is connected to the liquid inlet of the centripetal pump 4.

[0075] The above-mentioned preferred scheme has an ingenious design for the light liquid phase channel 91 and a simple manufacturing process.

[0076] Furthermore, based on the above embodiments, the channel between the outer wall of the large-diameter disk 314 and the inner wall of the first drum 21 forms part of the heavy liquid phase and solid slag channel 92.

[0077] The design of the heavy liquid phase and solid slag channel 92 is ingenious, adopting the above-mentioned preferred scheme.

[0078] Furthermore, based on the above embodiment, a plurality of through holes are provided on the intermediate bearing seat 23 along its axial direction, and the plurality of through holes form part of the heavy liquid phase and solid slag channel 92.

[0079] Using the above-mentioned preferred scheme, the intermediate bearing housing 23 has a "hub-type" structure. The heavy liquid phase and solid slag are smoothly transferred from the first drum 21 to the second drum 22 through the heavy liquid phase and solid slag channel 92. The heavy liquid phase is discharged from the heavy liquid phase channel 93. The solid slag passing through the intermediate bearing housing is transported by the second conveying screw 32 to the small diameter end of the second drum 22 and discharged from the solid slag outlet 94.

[0080] Furthermore, based on the above embodiment, the inner wall of the through hole of the intermediate bearing seat 23 has an inwardly protruding protrusion 10, and the protrusion 10 has a first inclined surface 101 facing the first feeding screw 31 and a second inclined surface 102 facing the second feeding screw 32.

[0081] By adopting the above-mentioned preferred scheme, the solid slag is smoothly transported into the second drum 22. The solid slag is pushed by the first conveying screw 31 to the top of the protrusion 10 via the first inclined surface 101, and makes an upward movement. After reaching the top, the solid slag slides with the help of centrifugal force, and slides from the top through the second inclined surface 102 into the second drum 22. After entering the second drum 22, the solid slag is then transported by the second conveying screw 32.

[0082] In some other embodiments, the large-diameter end of the second drum 22 has a larger size, and the solid slag settled on the inner wall of the first drum 21 can be directly transported into the second drum 22 by the first conveying screw 31.

[0083] The working process of the centrifuge of this invention is as follows:

[0084] The mixture 51 is introduced into the feed end 312 of the first conveying screw 31 through the feed pipe 1, and enters the first drum 21 through the material distribution hole to achieve centrifugal sedimentation separation;

[0085] The light liquid phase, heavy liquid phase and solid slag in the first drum 21 are together conveyed to the second drum 22 by the first conveying screw 31;

[0086] During the transport process, the clarified light liquid phase (the middle layer) flows from the light liquid phase channel 91 into the centrifugal pump 4 and is discharged from the centrifuge.

[0087] At the same time, the heavy liquid phase and solid slag that settle at the bottom reach the second drum 22 through the heavy liquid phase and solid slag channel 92, and the heavy liquid phase overflows from the heavy liquid phase overflow port 95 and is discharged from the centrifuge through the heavy liquid phase channel 93.

[0088] The solid slag is conveyed from the large diameter end of the second drum 22 to the small diameter end by the second conveying screw 32, and discharged from the centrifuge through the solid slag outlet 94.

[0089] This invention discloses a parallel-flow three-phase horizontal screw discharge sedimentation centrifuge, which has the following features:

[0090] Beneficial effects:

[0091] First, the feeding screw of the present invention adopts a segmented structure, and the first feeding screw 31 and the second feeding screw 32 are fixedly connected by the intermediate support shaft 33, which reduces the distance between the two ends of the screw, can realize the centrifuge with a large length-to-diameter ratio (length-to-diameter ratio of 4.5 or more), improve the rigidity of the screw, and can greatly increase the maximum speed of the centrifuge.

[0092] Secondly, in terms of the installation of the conveying screws, the first conveying screw 31 and the second conveying screw 32 are respectively installed inside the first drum 21 and the second drum 22, reducing the difficulty of assembly.

[0093] Third, the mixture 51 enters the first drum 21 from the feed pipe 1. The heavy liquid phase, light liquid phase, and solid residue settle and separate within the first drum 21 while moving towards the location of the second drum 22 in the same direction: the solid residue moves in direction 52, the light liquid phase in direction 53, and the heavy liquid phase in direction 54, as shown below. Figure 6 As shown, they move in parallel (referred to as parallel flow). The separated heavy liquid phase, light liquid phase, and solid residue are discharged through their respective channels. No eddies are generated during the separation and discharge processes, which greatly improves the separation efficiency and effect of the centrifuge.

[0094] Fourth, the light liquid phase is discharged from the center of the centrifuge by the centrifugal pump 4, and the heavy liquid phase is discharged from the heavy liquid phase channel 93 in the intermediate bearing housing 23. The large end of the centrifuge has no liquid discharge or material discharge (solid phase) hopper, and the casing can be simplified.

[0095] Fifth, the intermediate support 62 shortens the support distance of the traditional slag conveying screw. The intermediate support 62 and the large end support 61 are the main supports of the conveying screw, while the small end support 63 is only used as an auxiliary support for the conveying screw and can be omitted.

[0096] Sixth, the light liquid phase is separated from the first drum 21, and the heavy liquid phase is separated from the second drum 22. They are discharged through different channels, preventing cross-contact between the light and heavy liquid phases during discharge, resulting in better separation. Furthermore, the heavy liquid phase undergoes further clarification in the second drum 22 before discharge, as it travels a longer distance and has a longer residence time within the centrifuge, leading to even better clarification.

[0097] Seventh, it has a simple structure. Only local modifications are needed to the structure of a regular horizontal screw centrifuge to significantly improve the centrifuge's clarification and separation efficiency and effect.

[0098] In summary, the present invention can eliminate the scouring of the liquid layer inside the drum during feeding, reduce the disturbance of liquid flow to the sludge, enhance the rigidity of the screw, increase the operating speed of the centrifuge, and effectively improve the separation capacity and separation effect of the three-phase centrifuge, especially for liquid / liquid / solid three-phase separation containing fine solid sludge (e.g., for oily sludge, to achieve oil / water / sludge three-phase separation).

[0099] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0100] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0101] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

[0102] The control method of this invention is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this invention is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

Claims

1. A parallel-flow three-phase horizontal screw discharge sedimentation centrifuge, characterized in that, include: The system includes a feed pipe, a first drum, a first conveying screw disposed in the inner cavity of the first drum, a centripetal pump, a second drum, a second conveying screw disposed in the inner cavity of the second drum, an intermediate bearing seat for fixing the first drum and the second drum, and an intermediate support shaft for fixing the first conveying screw and the second conveying screw. The second drum is a conical drum. The liquid outlet of the feed pipe is connected to the material distribution port of the first conveying screw, and is used to transport the mixture into the first drum. The feed end of the first conveying screw is connected to the first drum via a large end support, and the intermediate bearing seat is connected to the intermediate support shaft via an intermediate support. The first conveying screw is used to transport the light liquid phase, heavy liquid phase and solid slag in the first drum to the second drum. The first and second drums are respectively mounted on bearing supports and can rotate under the drive of the drive device. A heavy liquid phase and solid slag channel is provided at their connection point. The heavy liquid phase and solid slag in the first drum flow into the second drum through the heavy liquid phase and solid slag channel. The intermediate bearing housing is provided with a heavy liquid phase channel, through which the heavy liquid phase in the second drum is discharged. The centripetal pump is disposed in the inner cavity of the second drum, and its inlet is disposed at the outlet end of the first conveying screw, for discharging the light liquid phase in the first drum; The second conveying screw is used to transport the solid slag inside the second drum from its large diameter end to its small diameter end, and discharge it through the solid slag outlet; A heavy liquid phase overflow port is formed between the radial disk of the intermediate support shaft and the feed end of the second conveying screw. The heavy liquid phase overflow port is connected to the heavy liquid phase channel and is located near the center of the second drum.

2. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 1, characterized in that, Several of the fabric inlets are distributed on the first conveying screw near the liquid outlet of the feed pipe.

3. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 1, characterized in that, The tail end of the intermediate support shaft near the small diameter end of the second drum is a cantilever structure or is supported by a small end support.

4. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 1, characterized in that, The centripetal pump is installed at the center of the second drum, the intermediate support shaft is sleeved around the periphery of the centripetal pump, and the radial disc of the intermediate support shaft is fixedly connected to the discharge end of the first conveying screw, and its axial cylinder is fixedly connected to the second conveying screw.

5. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 1, characterized in that, The discharge end of the first conveying screw has a large-diameter disc, and a groove is provided on the end face of the large-diameter disc facing the second drum. The inlet end of the centripetal pump is placed in the groove.

6. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 5, characterized in that, Several through holes are formed along the axial direction on the large-diameter disk, forming a light liquid phase channel, which is connected to the inlet of the centripetal pump.

7. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 6, characterized in that, The channel between the outer wall of the large-diameter disc and the inner wall of the first drum forms part of the heavy liquid phase and solid slag channel.

8. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 1, characterized in that, Several through holes are provided on the intermediate bearing housing along its axial direction, and the several through holes form part of the heavy liquid phase and solid slag channel.

9. The parallel-flow three-phase horizontal screw discharge sedimentation centrifuge according to claim 8, characterized in that, The inner wall of the through hole of the intermediate bearing housing has an inwardly protruding protrusion, and the protrusion has a first inclined surface facing the first feeding screw and a second inclined surface facing the second feeding screw.

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