Cross-flow liquid continuous concentration filter

Abstract

The utility model relates to the technical field of liquid filters, and particularly provides a cross-flow liquid continuous concentration filter which comprises a power assembly, a filter assembly and a material pipe, the power assembly comprises a driving piece and a rotating shaft. The rotating shaft penetrates through the center of the filtering assembly and extends in the axis direction. The filtering assembly comprises a rotating disc, a flow guide plate and a first bottom plate which are coaxially arranged. The at least two rotating discs are arranged in the axis direction, the first bottom plates are arranged at the bottoms of the rotating discs, and the flow guide plates are arranged between the two adjacent rotating discs. The rotating disc and the rotating shaft rotate synchronously, the rotating disc is provided with a curved surface structure protruding towards the first bottom plate, the flow guide plate and the first bottom plate are each of an inverted-cone-shaped structure, and a material passing gap is formed between the flow guide plate and the outer wall of the rotating shaft. The material pipe comprises a feeding pipe and a filtrate discharging pipe. According to the invention, multi-stage synchronous cross flow concentration, filtration and separation are creatively realized, tangential concentrated solution discharge and normal liquid component filtration are realized through the concave-surface-shaped turntable, and the filtration efficiency is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid filtering machines, in particular to a cross-flow liquid continuous concentration filter. BACKGROUND

[0002] The cross-flow concentration machine is a kind of concentration material equipment commonly used in the fields of mining, metallurgy, chemical industry and environmental protection. On the one hand, the existing cross-flow concentration machine can only realize single-stage filtration and cannot simultaneously perform multi-stage concentration filtration in one device, resulting in mutual covering of solid-phase particles of different particle sizes and reducing the filtration efficiency. On the other hand, the filter rotating disc used in the existing cross-flow concentration machine is a flat circular disc. Although the strong centrifugal force brought to the thin layer of solid-liquid two-phase working medium accumulated thereon when rotating can provide strong tangential discharge shear centrifugal force for the concentrated liquid containing a large amount of solid on the screen, so that the viscous concentrated liquid can be smoothly discharged at high speed, it cannot provide sufficient normal filtration force for the filtrate expected to pass through the screen, resulting in that the filtration force of the filtrate passing through the screen of the cross-flow concentration machine is only provided by the static pressure of the thin layer of liquid medium temporarily accumulated on the filter rotating disc. Such filtration force is extremely weak and is insufficient to overcome the huge filtration resistance formed by the fine screen mesh and the layer of viscous concentrated liquid accumulated thereon to form a sufficient filtration flow. Therefore, the cross-flow concentration machine not only has a very low filtration efficiency, but also cannot be provided with a sufficiently fine filter screen, and can only perform coarse filtration concentration. It is more impossible to form a too high concentration of concentrated liquid, otherwise the screen will be blocked, the effective filtration flow will be greatly reduced, and only low-concentration primary concentration filtration can be performed. This greatly limits the effective use range of the traditional cross-flow concentration machine, and there is no process feasibility in many working conditions, resulting in that the cross-flow concentration machine is difficult to be widely popularized and applied in the industrial field.

[0003] In the prior art, due to the lack of a continuous and efficient concentration filtration equipment in various solid-liquid separation processes of solid-liquid two-phase medium, a large flow of low-concentration solid-liquid two-phase medium is directly introduced into various filters for low-efficiency solid-liquid separation processing. Not only is the process efficiency very low, but also the equipment investment and process operation cost is huge. SUMMARY

[0004] The cross-flow liquid continuous concentration filter provided by the embodiments of the present application at least solves the problem that the existing concentration filter can only perform single-stage filtration and uses a flat rotating disc, and has a low filtration efficiency and insufficient filtration flow.

[0005] The cross-flow liquid continuous concentration filter provided by the embodiments of the present application comprises:

[0006] A power assembly, the power assembly comprises a driving member and a rotating shaft, the driving member is connected to one end of the rotating shaft and drives the rotating shaft to rotate.

[0007] The filter assembly is provided with a rotating shaft penetrating through the center of the filter assembly and extending along the axial direction of the filter assembly; the filter assembly comprises a rotating disc, a flow guide plate and a first bottom plate arranged coaxially; the rotating disc has at least two and is arranged along the axial direction; the first bottom plate is arranged at the bottom of the rotating disc; the flow guide plate is arranged between two adjacent rotating discs; the rotating disc is configured to rotate synchronously with the rotating shaft; the rotating disc has a curved surface structure protruding towards the first bottom plate; the flow guide plate and the first bottom plate are both inverted conical structures; and the flow guide plate has a material flow gap with the outer wall of the rotating shaft.

[0008] The material pipe comprises an upper material pipe and a filtrate lower material pipe; one end of the upper material pipe is used for feeding; the other end of the upper material pipe is located at the top of the rotating disc; one end of the filtrate lower material pipe is connected with a filtrate collecting device; the other end of the filtrate lower material pipe is connected with the first bottom plate and communicates with the bottom of the filter assembly.

[0009] The filter assembly further comprises a material guide box part, and the material guide box part is arranged in one-to-one correspondence with the rotating disc; the material guide box part is arranged around the outer periphery of the rotating disc and has a radial material flow channel with the rotating disc.

[0010] The material guide box parts are arranged along the axial direction and the material flow channels are connected with each other; the outer walls of adjacent material guide box parts are sealingly connected through a gasket.

[0011] The material pipe further comprises a concentrated liquid lower material pipe; the bottom of the material guide box part is further connected with a second bottom plate; the second bottom plate is arranged in an inverted conical structure; and the bottom of the second bottom plate communicates with the concentrated liquid lower material pipe.

[0012] The filter assembly further comprises a material guide plate, and the material guide plate is arranged in one-to-one correspondence with the rotating disc; the material guide plate is arranged in a conical structure; the material guide plate is located in the material flow channel and is arranged around the outer edge of the rotating disc.

[0013] The rotating disc comprises two rotating disc parts arranged in a stack along the axial direction and a filter screen arranged in the axial gap between the two rotating disc parts; the rotating disc part is provided with a plurality of through holes; and the filter screen is provided with filter screen holes.

[0014] The cross-flow liquid continuous concentration filter provided by the embodiment of the application is characterized in that the pore size of the filter screen hole of the filter screen gradually decreases in the direction of the axis towards the direction of the first bottom plate.

[0015] The cross-flow liquid continuous concentration filter provided by the embodiment of the application is characterized in that the rotating shaft is externally covered with a positioning shaft sleeve, and the rotating shaft is connected with the rotating disc through a key.

[0016] The cross-flow liquid continuous concentration filter provided by the embodiment of the application is characterized in that the material pipe further comprises a washing liquid pipe, a first liquid discharge pipe and a second liquid discharge pipe.

[0017] One end of the washing liquid pipe is used for introducing cleaning liquid, and the other end of the washing liquid pipe is communicated with the inside of the filter assembly and located at the top of the rotating disc.

[0018] The first liquid discharge pipe is communicated with the filtrate discharging pipe.

[0019] The second liquid discharge pipe is communicated with the concentrated liquid discharging pipe of the material pipe.

[0020] The cross-flow liquid continuous concentration filter provided by the embodiment of the application is characterized in that a conical top cover is further arranged between the filter assembly and the power assembly; a first sealing element is arranged at the connection position of the rotating shaft and the conical top cover, the inner wall of the rotating shaft in contact with the first sealing element is provided with a threaded groove; and a first bearing is arranged at the top of the rotating shaft.

[0021] A sealing liquid injection plate and a sealing liquid discharge plate are arranged between the first sealing element and the first bearing from bottom to top; the sealing liquid injection plate forms a first annular gap with the rotating shaft in the radial direction, and the sealing liquid discharge plate forms a second annular gap with the rotating shaft in the radial direction; the sealing liquid injection plate is provided with a sealing liquid injection port communicated with the first annular gap, and the sealing liquid discharge plate is provided with a sealing liquid discharge port communicated with the second annular gap.

[0022] The cross-flow liquid continuous concentration filter provided by the embodiment of the application is characterized in that a second sealing element is arranged at the connection position of the bottom of the rotating shaft and the filter assembly, the inner wall of the rotating shaft in contact with the second sealing element is provided with a threaded groove; and a second bearing is further arranged at the bottom of the rotating shaft, and the second bearing is located below the second sealing element.

[0023] The first closed area where the second bearing is located is communicated with a lubricating liquid inlet, and the second closed area where the second sealing element is located is communicated with a sealing liquid inlet; a sealing ring is arranged in the first closed area and the second closed area, and the liquid pressure of the lubricating liquid in the first closed area is greater than the liquid pressure of the sealing liquid in the second closed area, and the liquid pressure of the sealing liquid in the second closed area is also greater than the liquid pressure in the filter assembly.

[0024] The cross-flow liquid continuous concentration filter provided by the embodiment of the application solves the problem that the rotating disc of the existing cross-flow concentration machine can only perform single-stage filtration, and realizes a multi-stage synchronous cross-flow concentration filtration and separation process. The embodiment also solves the problem of insufficient filtration efficiency of the existing cross-flow concentration machine. The rotating disc with a concave upper surface not only provides high-speed tangential discharge shear force of the concentrated liquid of solid matter on the filter screen by using the centrifugal force of high-speed rotating liquid, so as to realize high-speed tangential discharge of the remaining high-concentration concentrated liquid on the filter screen, but also provides strong filtration power when the filtrate passes through the filter screen by using the centrifugal force of high-speed rotating liquid, so as to double the cross-flow concentration filtration flow. The reliable tangential concentrated liquid discharge and high-speed normal liquid component filtration are realized, and the cross-flow concentration filter has great filtration power and high concentration filtration efficiency.

[0025] The cross-flow liquid continuous concentration filter provided by the embodiment of the application is suitable for the solid-liquid separation process of solid-liquid two-phase process medium in various industrial production lines, and is also suitable for the filtration treatment of industrial wastewater containing small suspended solid matter. In the overall filtration system, the medium treatment flow of various solid-liquid separation devices can be greatly reduced, so as to improve the process efficiency, save production cost, and realize long-term stable, maintenance-free, reliable and efficient operation. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application in any way. In the drawings:

[0027] Figure 1 is a cross-sectional structure schematic diagram of the cross-flow liquid continuous concentration filter of the embodiment of the application.

[0028] Figure 2 is Figure 1 is an enlarged schematic diagram of position A in FIG.

[0029] Figure 3 is Figure 1 is an enlarged schematic diagram of position B in FIG.

[0030] Figure 4Figure 7 is an enlarged schematic view of the position of the rotating disc, the first bottom plate and the second bottom plate at the bottom of the cross-flow liquid continuous concentration filter of the embodiment of the present application.

[0031] Figure 5 Figure 8 is an enlarged schematic view of the position of another rotating disc and the flow guide plate except the rotating disc at the bottom of the cross-flow liquid continuous concentration filter of the embodiment of the present application.

[0032] In the above drawings, the following reference signs apply:

[0033] 1 - driving member; 11 - AC motor; 12 - speed reducer; 13 - shaft coupling; 2 - rotating shaft; 21 - positioning shaft sleeve; 22 - key; 31 - rotating disc; 3101 - reinforcing rib; 32 - flow guide plate; 3201 - material passing gap; 33 - first bottom plate; 34 - material guide box split body; 3401 - material passing channel; 3402 - sealing gasket; 35 - material guide plate; 36 - second bottom plate; 41 - feeding pipe; 42 - filtrate discharging pipe; 43 - concentrated liquid discharging pipe; 44 - washing liquid pipe; 45 - first liquid discharging pipe; 46 - second liquid discharging pipe; 47 - lubricating liquid pipe; 48 - sealing liquid pipe; 51 - conical top cover; 52 - first sealing member; 53 - first bearing; 5301 - first bearing seat; 5302 - bearing cover; 5303 - oil injection nozzle; 54 - sealing liquid injection plate; 5401 - first annular gap; 5402 - sealing liquid injection port; 55 - sealing liquid release plate; 5501 - second annular gap; 5502 - sealing liquid release port; 56 - sealing piece; 57 - first sealing ring; 58 - felt dustproof ring; 61 - second sealing member; 62 - second bearing; 6201 - second bearing seat; 6202 - bearing cover; 63 - first closed area; 64 - second closed area; 65 - single-end mechanical seal assembly; 66 - second sealing ring; 71 - support; 72 - ring beam; 73 - support leg. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] The foregoing description details certain embodiments of the application. It will be apparent, however, to one of ordinary skill in the art that numerous changes can be made without departing from the scope of the application and that equivalents can be employed in accordance with the important principles of the application. Thus, nothing in the foregoing description, showing the preferred aspect should be taken to limit the scope of the application. Parts, operations, expressions of numbers and numerical values set forth in these embodiments are not intended to limit the scope of the present application unless otherwise specifically stated. Also, it will be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for the sake of convenience in description. Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the present disclosure where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0037] In the field of industrial production today, there are a large number of solid-liquid separation processes, which must use various solid-liquid separation equipment to separate the solid suspended in the liquid medium. Among them, the commonly used solid-liquid separation equipment includes rotary filter, plate and frame filter press, centrifuge and horizontal screw machine, etc. If the concentration of solid particles suspended in the original solid-liquid two-phase medium to be treated is too low, the working efficiency of these expensive solid-liquid separation equipment will be greatly reduced, and the cost of solid-liquid separation will be increased. Therefore, it is necessary to use a concentration filter to pretreat the raw material before these equipment works, that is, to carry out high-efficiency large-scale concentration on the original solid-liquid two-phase medium, to increase the concentration of solid suspended particles contained therein, and then to reduce the flow of solid-liquid two-phase medium into the above-mentioned solid-liquid separation equipment, to improve the solid-liquid separation efficiency, and to greatly reduce the production cost.

[0038] In addition, in the field of industrial production, a large amount of industrial wastewater containing micro-suspended solid will be discharged on various industrial production lines. The premise for the industrial wastewater to be recycled or discharged in accordance with the environmental protection technical standard is to filter out the micro-suspended solid from the wastewater by using a high-efficiency liquid filter. Since the concentration of solid suspended particles contained in the industrial wastewater is low, if the industrial wastewater can be pretreated by high-efficiency large-scale concentration to increase the concentration of solid suspended particles contained therein, the flow of solid-liquid two-phase medium for solid-liquid separation and filtration in the downstream wastewater treatment equipment can be reduced, the production efficiency can be greatly improved, and the production cost can be reduced.

[0039] The prior art provides a thickener, when the thickener works, raw materials enter the thickener pool body from the center or the periphery, under the action of gravity, solid particles gradually settle, and liquid slowly flows upward or to the periphery. At the same time, the cross-shaped rake arm makes a circular motion around the central vertical shaft under the drive of the motor. The rotation of the rake arm pushes the material settled on the pool bottom to move to the central discharge port, and in this process, the movement path of the material and the flow direction of the liquid are interwoven, forming a flow trajectory similar to a "cross". Due to this special flow state, the thickener is also called "cross-flow thickener".

[0040] Although the traditional cross-flow thickener can participate in the pretreatment link in the above-mentioned solid-liquid separation and industrial wastewater treatment, the traditional cross-flow thickener only has a single-stage single filter disc, so that solid particles of various particle sizes interfere with each other, and the filtering efficiency is low.

[0041] In addition to the single-stage filter disc, the inventor has found that the filter disc of the traditional cross-flow thickener is a pure plane high-speed rotating disc lined with a filter screen. The high-speed rotation of the disc provides a centrifugal force for the liquid medium on the disc surface, and the centrifugal force can provide a horizontal tangent discharge shear force for the concentrated liquid on the filter screen, but cannot provide a filtering power for the liquid component to vertically pass through the filter screen. The filtering power of the liquid component to vertically pass through the filter screen can only rely on the microstatic pressure provided by the liquid thin layer accumulated on the rotating disc. The plane disc design results in very low filtering power of the liquid component downward, and it is difficult to form a high-efficiency large-flow cross-flow concentration process.

[0042] In the prior art, in order to overcome the problem of insufficient filtering power of the liquid component vertically downward, the diameter of the filter screen is increased to accelerate the flow of the liquid. However, the excessively large diameter of the filter screen is insufficient for the screening capacity of solid particles, and can only concentrate and remove a small amount of the largest solid particles contained in the liquid medium, thereby greatly limiting the application range and application effect of the cross-flow thickener.

[0043] In summary, the existing cross-flow thickener has the defect of single-stage filtration, and the plane structure of the filter disc limits the filtering efficiency. Therefore, there is an urgent need for a concentration filter to solve the above problems and realize high-efficiency, low-cost and large-scale concentration filtration of solid-liquid two-phase medium or industrial wastewater.

[0044] Therefore, the embodiment of the present application provides a cross-flow liquid continuous concentration filter, which can realize multi-stage filtration and provide higher filtering efficiency compared with the existing cross-flow thickener, and is used for concentration filtration treatment of various solid-liquid two-phase media or industrial wastewater containing solid substances on an industrial production line. As an upstream pretreatment equipment of the entire solid-liquid separation system, it is matched with various expensive and low-efficiency solid-liquid separation equipment downstream, so as to greatly improve the production efficiency of the entire solid-liquid separation system and reduce the production cost.

[0045] The embodiment of the utility model can realize long-term continuous stable work, automatic cleaning of filter elements, and continuous automatic continuous feeding and continuous discharge, without frequent manual maintenance, only simple regular manual maintenance is needed, and high-efficiency working state can be maintained.

[0046] Referring to Figures 1-5 The utility model provides a cross flow liquid continuous concentration filter machine including power assembly, filter assembly and material pipe. Power assembly, filter assembly and material pipe are supported and fixed by support 71, ring beam 72 and support leg 73. Among them, power assembly includes driving part 1 and pivot 2, and driving part 1 drives pivot 2 to rotate, and simultaneously drives the rotation of the turntable 31 of filter assembly to realize filtration concentration. Material pipe is used for feeding, discharging, and cleaning, sealing and lubricating maintenance of equipment.

[0047] Specifically, referring to Figure 1 Power assembly includes driving part 1 and pivot 2. Driving part 1 includes alternating current motor 11, speed reducer 12 and shaft coupling 13. Alternating current motor 11 is used as power source, speed reducer 12 is connected on the output shaft of alternating current motor 11, and the output torque is transmitted through gear engagement. Shaft coupling 13 connects the output shaft of speed reducer 12 and one end of pivot 2, and transmits the power output by speed reducer 12 to pivot 2, so that the two rotate synchronously. Pivot 2 is arranged in the filter assembly, and drives the rotation of the turntable 31 of the filter assembly.

[0048] Further, referring to Figure 1 And Figure 5 Pivot 2 is covered with positioning shaft sleeve 21. Since pivot 2 drives the rotation of turntable 31, corresponding to each turntable 31, positioning shaft sleeve 21 of pivot 2 is connected with turntable 31 outside, and the key 22 used for key connection can be set as a flat key or a spline.

[0049] Specifically, referring to Figure 1 Filter assembly includes coaxially arranged turntable 31, flow guide plate 32 and first bottom plate 33. Filter assembly further includes material guide box split body 34, material guide plate 35 and second bottom plate 36. Pivot 2 is arranged in the center of filter assembly, and the extension direction of pivot 2 is consistent with the axis direction of filter assembly; the axis direction of filter assembly is consistent with the axis of turntable 31, flow guide plate 32, first bottom plate 33, material guide box split body 34, material guide plate 35 and second bottom plate 36.

[0050] Further, turntable 31 is provided with at least two; referring to Figure 1As shown in the preferred embodiment of the utility model, the rotating disc 31 is preferably provided as four. At least two rotating discs 31 are arranged along the axial direction, and the arrangement of multiple rotating discs 31 can realize multi-stage filtration in the same concentration filter, wherein the rotating disc 31 located at the top is the first stage, and multi-stage filtration is formed from top to bottom, and the filtration efficiency and effect are better. The utility model adopts a standard modular design structure, and the number of rotating discs 31 can be increased or reduced at will according to the corresponding working conditions and actual needs to set the number of stages, and different lengths of rotating shafts 2 are replaced correspondingly according to different rotating disc stage numbers, so that any number of synchronous cross-flow concentration filtration stages are constructed, and the highest production efficiency is realized.

[0051] In succession, with reference to Figure 1 、 Figure 4 and Figure 5 As shown in the preferred embodiment of the utility model, the first bottom plate 33 and the discharging position are at the bottom of the rotating disc 31, the rotating disc 31 has a curved surface structure protruding towards the direction of the first bottom plate 33, and a concave surface is formed on the top surface of the rotating disc 31. For the cross-sectional view of the filter assembly along the axial direction, the curved shape of the rotating disc 31 can be set as a circular arc, a parabola, an involute, an elliptical line, a spiral line or other convex curves curved towards the bottom. Preferably, the cross-sectional shape of the rotating disc 31 is a circular arc, the rotating disc 31 is provided as a spherical surface structure, and the spherical center is above the rotating disc 31.

[0052] Compared with the flat disc structure, the concave curved surface provided in the embodiment can generate a strong centrifugal force on the raw materials in the rotating disc 31, so that the raw materials are efficiently separated into concentrated liquid and filtrate. The concave curved surface rotating disc 31 can provide the concentrated liquid with a discharging shear force along the tangent direction of the curved surface of the rotating disc 31, so as to realize continuous high-speed discharging of the concentrated liquid; at the same time, the concave curved surface rotating disc 31 can also provide the filtrate with a filtering dynamic force along the normal direction of the curved surface of the rotating disc 31, so as to efficiently remove most of the liquid components in the raw materials.

[0053] In succession, in the preferred embodiment of the utility model, the rotating disc 31 comprises two rotating disc parts stacked along the axial direction, and a filter screen arranged in the axial gap between the two rotating disc parts. The rotating disc part is provided as a punched curved multi-hole stainless steel plate, a plurality of through holes are arranged on the two rotating disc parts, and the through holes are communicated with each other to facilitate the passage of materials. The filter screen is clamped between the two rotating disc parts, and the filter screen is provided with filter screen holes for filtering materials.

[0054] Due to the multiple rotating discs 31 in the filter assembly forming multiple stages of filtration, the pore size of the filter mesh in each rotating disc 31 is gradually reduced from top to bottom in the axial direction, preferably towards the direction of the first bottom plate 33. Due to the adoption of multiple rotating discs 31, it is sufficient to allow the setting of multiple stages of fine mesh filter, realizing a high-efficiency fine and high-concentration concentration filtration process. Therefore, the embodiment has a doubled filtration efficiency, and can provide a new high-efficiency process scheme for various existing solid-liquid separation processes, greatly improving the solid-liquid separation efficiency and reducing the solid-liquid separation cost. In other embodiments, the pore size of the filter mesh on each rotating disc 31 can also be adjusted according to the characteristics of the raw material to meet the filtration concentration requirements, adapt to the solid-liquid two-phase flow concentration filtration process of different solid particle concentrations and grading components, and achieve the best process effect.

[0055] In succession, the bottom surface of the rotating disc 31 is also provided with a reinforcing rib 3101 in a mesh structure. The reinforcing rib 3101 is welded with the bottom surface of the rotating disc 31, for improving the strength and rigidity of the rotating disc 31, and avoiding damage in high-speed rotation.

[0056] Further, as shown in Figure 1 and Figure 5 , the guide plate 32 is arranged between two adjacent rotating discs 31, and is in an inverted conical structure. The guide plate 32 has a material passing gap 3201 with the outer wall of the rotating shaft 2, and when the rotating disc 31 rotates synchronously with the rotating shaft 2, the material passing through the rotating disc 31 falls into the guide plate 32 below, and flows to the center of the rotating shaft 2 along the inverted conical structure of the guide plate 32, and then falls into the concave surface of the next rotating disc 31 below through the material passing gap 3201 of the guide plate 32.

[0057] Further, as shown in Figure 1 and Figure 4 , the first bottom plate 33 is located at the bottom of the rotating disc 31, specifically at the bottom of the lowermost rotating disc 31 in the axial direction. After the filtrate passes through the lowermost rotating disc 31, the bottom is no longer provided with the guide plate 32, but is provided with the first bottom plate 33, and the filtrate is collected and guided through the first bottom plate 33. The first bottom plate 33 is also in an inverted conical structure, and the bottom is communicated with the filtrate discharge pipe 42 for collecting the filtrate. Preferably, the taper of the first bottom plate 33 is greater than the taper of the guide plate 32, providing installation and maintenance space for the bearing at the bottom of the rotating shaft 2 and the pipe, and accelerating the collection speed of the filtrate.

[0058] Further, as shown in Figure 1As shown, the material guiding box parts 34 are arranged one by one corresponding to the rotating discs 31. The material guiding box parts 34 are arranged around the outer periphery of the rotating discs 31, and have radial material passing channels 3401 with the rotating discs 31. The material guiding box parts 34 are arranged along the axial direction, the corresponding material passing channels 3401 are communicated with each other, and the outer walls of adjacent material guiding box parts 34 are connected by gaskets. When the number of rotating discs 31 is changed to adjust the concentration and filtration effect, the corresponding number of material guiding box parts 34 are connected by the gaskets 3402, and a complete closed material guiding box is obtained by the connection.

[0059] Further, referring to Figure 1 As shown, the material guiding plates 35 are arranged one by one corresponding to the rotating discs 31. The material guiding plates 35 are arranged as upright conical structures, and are arranged around the outer periphery of the rotating discs 31 in the material passing channels 3401. The concentration liquid flying along the outer periphery of the rotating discs 31 is guided into the material passing channels 3401 and falls vertically, so that the flying concentration liquid is prevented from splashing on the walls of the material guiding box parts 34.

[0060] Further, referring to Figure 1 and Figure 4 As shown, the bottoms of the material guiding box parts 34 are further connected with second bottom plates 36 arranged as inverted conical structures, which are used to collect the concentration liquid in the material passing channels 3401 of the material guiding box parts 34. Preferably, the taper of the second bottom plates 36 is larger than that of the first bottom plates 33.

[0061] Specifically, referring to Figure 1 As shown, the material pipes include a material feeding pipe 41, a filtrate discharging pipe 42, a concentration liquid discharging pipe 43, a washing liquid pipe 44, a first liquid discharging pipe 45 and a second liquid discharging pipe 46, a lubricating liquid pipe 47 and a sealing liquid pipe 48. The solid-liquid two-phase medium or industrial wastewater is used as raw material, and the filtration and concentration are performed to obtain filtrate with more liquid components and concentration liquid with more solid particles. The material feeding pipe 41 is used for adding raw material, and the filtrate discharging pipe 42 and the concentration liquid discharging pipe 43 are used for collecting the products after the concentration and filtration. The washing liquid pipe 44, the first liquid discharging pipe 45 and the second liquid discharging pipe 46 are used for cleaning and maintenance of the cross-flow liquid continuous concentration and filtration machine, and the lubricating liquid pipe 47 and the sealing liquid pipe 48 are used for maintenance of the shaft bearing.

[0062] Further, referring to Figure 1 As shown, one end of the material feeding pipe 41 is connected with a raw material supply device for feeding, and the other end is located in the filtration assembly and at the top of the rotating disc 31 of the upper first stage. The material feeding pipe 41 feeds the raw material into the concave surface of the rotating disc 31 of the first stage.

[0063] Further, one end of the filtrate discharging pipe 42 is connected with a filtrate collecting device for collecting filtrate, and the other end of the filtrate discharging pipe 42 is connected with the first bottom plate 33 and located at the bottom tip of the inverted conical structure of the first bottom plate 33 for guiding the filtrate.

[0064] Furthermore, one end of the concentrate discharge pipe 43 is connected to a concentrate collection device for collecting concentrate, and the other end of the concentrate discharge pipe 43 is connected to a second base plate 36, located at the bottom tip of the inverted conical structure of the second base plate 36, for discharging concentrate.

[0065] Furthermore, one end of the washing liquid pipe 44 is connected to the washing liquid supply device for introducing the cleaning liquid, and the other end of the washing liquid pipe 44 is connected to the inside of the filter assembly and is located at the top of the turntable 31. The end of the washing liquid pipe 44 inside the filter assembly is the same as the feed pipe 41, both located at the top of the first-stage turntable 31, allowing the washing liquid to be introduced into the concave surface of the first-stage turntable 31.

[0066] Furthermore, the first drain pipe 45 is connected as a branch pipe to the filtrate discharge pipe 42 for discharging the washing liquid. The second drain pipe 46 is connected as a branch pipe to the concentrate discharge pipe 43, which is used both for auxiliary discharge of the washing liquid and for introducing washing liquid during the backwashing process.

[0067] Specifically, refer to Figure 1 and Figure 2 As shown, a positively positioned conical top cover 51 is provided between the filter assembly and the top power assembly. A first seal 52 is provided at the connection between the rotating shaft 2 and the conical top cover 51. The first seal 52 is provided with a micro-threaded groove for contacting the inner wall of the rotating shaft 2. The first seal 52 is configured as a spiral groove non-contact seal. A first bearing 53 is provided at the top of the rotating shaft 2. The bearing is surrounded by a first bearing seat 5301 and a bearing cover 5302.

[0068] It should be noted that the rotation direction of the micro-thread groove must match the rotation direction of the rotating shaft 2, so as to ensure that any solid objects entering the micro-thread groove from the direction of the lower guide box or turntable 31 will be automatically returned to the original guide box or turntable 31 by the rotation of the rotating shaft 2, and will not enter the first bearing 53 set at the upper part, thus forming a reliable non-contact sealing structure for the thread groove.

[0069] A sealing fluid injection plate 54 and a sealing fluid discharge plate 55 are provided from bottom to top between the first seal 52 and the first bearing 53. Sealing plates 56 are provided between the first seal 52 and the conical top cover 51, between the first seal 52 and the sealing fluid injection plate 54, between the sealing fluid injection and the sealing fluid discharge plate 55, between the sealing fluid discharge plate 55 and the first bearing seat 5301, and between the first bearing seat 5301 and the bearing cover 5302.

[0070] Next, a first annular gap 5401 is formed between the sealing fluid injection plate 54 and the rotating shaft 2 in the radial direction. The first annular gap 5401 is an internal annular groove of the sealing fluid injection plate 54. The pressure of the sealing fluid injected into the first annular gap 5401 must be maintained appropriately higher than the pressure of the liquid working medium in the guide box below it to ensure that the liquid working medium does not leak into the first bearing 53 above it. A second annular gap 5501 is formed between the sealing fluid drain plate 55 and the rotating shaft 2 in the radial direction. The second annular gap 5501 is an internal annular groove of the sealing fluid drain plate 55.

[0071] A first sealing ring 57 is provided between the first annular gap 5401 and the second annular gap 5501, and between the second annular gap 5501 and the bearing housing. The sealing fluid injection plate 54 is provided with a sealing fluid injection port 5402 communicating with the first annular gap 5401, and the sealing fluid discharge plate 55 is provided with a sealing fluid discharge port 5502 communicating with the second annular gap 5501. The sealing fluid discharge port 5502 is connected to the atmosphere through a pipe and is set as a liquid storage tank for normal pressure venting. It is forbidden to form any back pressure and to prevent the sealing fluid from leaking into the bearing above it.

[0072] A felt dustproof ring 58 is provided between the bearing cover and the rotating shaft 2. An oil injection nozzle 5303 is also provided on the bearing cover 5302, which is used to inject lubricant.

[0073] Specifically, refer to Figure 1 and Figure 3 As shown, a second seal 61 is provided at the connection between the bottom of the rotating shaft 2 and the filter assembly. The second seal 61 is provided with a tiny threaded groove on the inner wall of the rotating shaft 2, and is also a spiral groove non-contact seal. A second bearing 62 is also provided at the bottom of the rotating shaft 2, located below the second seal 61.

[0074] It should be noted that the rotation direction of the micro-thread groove must match the rotation direction of the rotating shaft 2, so as to ensure that any solid material entering the micro-thread groove from the direction of the upper guide box will be automatically driven by the rotation of the rotating shaft 2 and automatically returned to the original guide box along the micro-spiral groove, and will not enter the second bearing 62 set at the lower part, thus forming a reliable non-contact sealing structure for the thread groove.

[0075] The first enclosed area 63, where the second bearing 62 is located, is connected to a lubricant inlet, which is connected to the lubricant feed pipe 47. The first enclosed area 63 is sealed by a bearing cap 6202.

[0076] The second closed area 64 where the second seal 61 is located is communicated with a sealing liquid inlet communicated with the sealing liquid pipe 48.

[0077] The second seal ring 66 is arranged between the first closed area 63 and the second closed area 64, the liquid pressure in the first closed area 63 is greater than that in the second closed area 64, and the liquid pressure of the sealing liquid in the second closed area 64 also needs to be kept higher than the pressure of the liquid working medium in the material guide box of the filter assembly, so as to ensure that the liquid working medium cannot leak into the mechanical seal below and the second bearing 62 below.

[0078] The working principle of the cross-flow liquid continuous concentrator provided by the utility model is as follows.

[0079] In the first aspect, for the filtering process of the cross-flow liquid continuous concentrator, the specific steps are as follows:

[0080] The AC motor 11 is started to drive the rotating shaft 2 to rotate at high speed through the speed reducer 12 and the shaft coupling 13.

[0081] The feeding pipe 41 introduces raw materials into the filter assembly, and the raw materials are low-concentration and large-flow original solid-liquid two-phase medium.

[0082] When the rotating disc 31 rotates, a strong centrifugal force is generated, a large amount of liquid components in the raw materials are under the combined action of the hydrostatic pressure and the centrifugal force, and are high-speed through the filter screen of the rotating disc 31 along the normal direction of the concave surface of the rotating disc 31, fall into the deflector plate 32 below, and flow to the material passing gap 3201 under the guidance of the deflector plate 32, and flow into the concave cavity formed by the concave surface of the next rotating disc 31 and close to the rotating shaft 2.

[0083] The material falling into the next rotating disc 31 through the first rotating disc 31 is consistent with the concentration separation process of the raw materials in the first rotating disc 31, a large amount of liquid components fall into the deflector plate 32 and enter the next rotating disc 31 through the filter screen, and the concentrated liquid is ejected and falls into the material passing channel 3401 through the material guide plate 35.

[0084] It should be noted that the mesh diameter of the filter screen gradually decreases, that is, the next stage of the rotating disc 31 is provided with a screen with finer mesh. Therefore, the material that passes through the upper stage rotating disc 31 will be further concentrated in the lower stage rotating disc 31, and the proportion of liquid components in the filtrate passing through the rotating disc 31 and the guide plate 32 gradually increases, and the proportion of solid medium and the size of solid particles gradually decrease. Until the last stage rotating disc 31 at the bottom, the filtrate passing through the rotating disc 31 no longer falls into the guide plate 32, but falls into the first bottom plate 33 and is collected through the filtrate discharge pipe 42.

[0085] In the filtration process of each stage of the rotating disc 31, the concentrated liquid that fails to pass through the rotating disc 31 and is thrown out due to centrifugal force, flies to the guide plate 35 along the outer edge of the rotating disc 31 and falls into the material passing channel 3401, and is collected through the second bottom plate 36 and the concentrated liquid discharge pipe 43.

[0086] Although the concentrated liquid on the filter screen has high viscosity and large flow resistance, the centrifugal force of the rotating disc 31 provides a large discharge shear force in the tangential direction of the concave surface of the rotating disc 31. Therefore, the concentrated liquid with high viscosity will not adhere to the concave surface of the rotating disc 31, but will be thrown out immediately and fly to the outer edge of each stage of the rotating disc 31, and fall into the material passing channel 3401 under the action of the guide plate 35. These concentrated liquids will enter the downstream special solid-liquid separation equipment to realize the final solid-liquid separation.

[0087] At the same time, the centrifugal force also provides a filtering component force in the normal direction of the concave surface of the rotating disc 31, so that a large amount of liquid components in the material pass through the filter screen at high speed and are separated and filtered, and are continuously separated in multiple stages thereafter, and the content of extremely fine solid suspended matter in the final filtrate is extremely small. The filtrate discharged through the filtrate discharge pipe 42 will enter the downstream special environmental filter to realize the final environmental filtration and discharge.

[0088] In the second aspect, for the cleaning process of the cross-flow liquid continuous concentrator, the specific steps are as follows:

[0089] The cross-flow liquid continuous concentrator provided in the embodiment will have a thin layer of solid deposits attached to the inside of the filter assembly, including the rotating disc 31, the guide box 34, the guide plate 35 and the guide plate 32. If not cleaned in time, the deposits will become increasingly hardened and scaled, and in severe cases, the machine needs to be stopped for manual maintenance, and the solid deposits will easily affect the production efficiency. Accordingly, the cross-flow liquid continuous concentrator provided in the embodiment is solved through the cleaning process, which specifically includes forward washing and reverse washing, and through the forward washing and reverse washing, the long-period maintenance-free and efficient operation of the equipment is ensured.

[0090] The positive washing process is to introduce cleaning liquid through the washing liquid pipe 44, and to realize the regular cleaning of the rotating disc 31 and the guide box body 34 by using the centrifugal force, inertial force and viscous drag of liquid flowing at high speed on the surface of solid. The formed waste washing liquid sewage is discharged through the first liquid discharge pipe 45 and the second liquid discharge pipe 46.

[0091] The backwashing process is to introduce cleaning liquid through the second liquid discharge pipe 46, and to realize the regular cleaning of the rotating disc 31 and the guide box body 34 by using the kinetic energy and static pressure of liquid passing through the screen, and by using the centrifugal force, inertial force and viscous drag of liquid flowing at high speed on the surface of solid. The formed waste washing liquid sewage is discharged through the first liquid discharge pipe 45. The residual waste cleaning liquid sewage in the equipment after the cleaning is also discharged through the second liquid discharge pipe 46.

[0092] In the third aspect, the sealing and lubricating process of the cross-flow liquid continuous concentrator is as follows:

[0093] Under the long-term action of solid-liquid two-phase medium, a large number of solid particles are easy to enter the bearing shaft seal of the rotating shaft 2, resulting in bearing wear and failure and sealing failure, and a large amount of liquid leakage. Preferably, the bearing maintenance and sealing are realized by the structural design of the top bearing and the bottom bearing.

[0094] For the first bearing 53 at the top, the lubricating liquid is injected through the oil injection nozzle 5303 to realize lubricating maintenance.

[0095] For the first bearing 53 at the top, the sealing liquid with a certain pressure is injected into the first annular gap 5401 through the sealing liquid injection port 5402, and the sealing liquid flows into the inside of the equipment through the screw groove on the inner wall of the bottom first sealing element 52. It should be noted that the direction of the screw groove of the first sealing element 52 is adapted to the rotation direction of the rotating shaft 2, so that the sealing liquid entering the screw groove can only flow downward in one direction in a small amount, and any solid components contained in the solid-liquid two-phase liquid medium in the guide box below cannot leak into the first bearing 53. When the rotating shaft 2 rotates, any solid entering the screw groove will be immediately transported back to the guide box below in the opposite direction and cannot infiltrate upward to affect the first bearing 53.

[0096] At the same time, the sealing liquid in the first annular gap 5401 also seeps upward through the first sealing ring 57, and at this time, the second annular gap 5501 and the sealing liquid pressure relief port 5502 at normal pressure can discharge the seeped sealing liquid to avoid the seepage of the sealing liquid into the first bearing 53.

[0097] For the second bearing 62 at the bottom, the lubricating liquid with a certain pressure enters the first closed area 63 through the lubricating liquid pipe 47 and completely immerses the bearing.

[0098] The sealing liquid with pressure enters into and fills the second closed area 64 from the sealing liquid pipe 48, completely immerses the single end face mechanical sealing assembly 65, and necessarily reaches the second sealing element 61 installed on the upper part of the bearing housing, passes through the threaded groove of the second sealing element 61, and flows into the equipment interior in a small amount upward. It should be noted that the threaded groove direction of the second sealing element 61 is adapted to the rotation direction of the rotating shaft 2, so that the sealing liquid entering the threaded groove can only flow in the equipment in one direction upward, and cannot infiltrate downward to affect the second bearing 62 when the rotating shaft 2 rotates.

[0099] Since the lubricating liquid pressure in the first closed area 63 is greater than the sealing liquid pressure in the second closed area 64, the pressure difference can avoid the sealing liquid in the second closed area 64 from leaking through the second sealing ring 66 to the second bearing 62 downward, thereby ensuring that the second bearing 62 can work stably and reliably for a long time without failure.

[0100] In the embodiment, the chemical components of the sealing liquid and the lubricating liquid are both compatible with the solid-liquid two-phase medium raw material, and a small amount of leakage does not affect the separation and concentration of the raw material. The sealing structure at the first bearing 53 and the second bearing 62 has strong reliability and sealing performance, which prevents the raw material from leaking and at the same time provides good lubrication and maintenance for the bearings, prolongs the service life of the equipment, and avoids premature wear or sealing failure of the bearings.

[0101] The cross-flow liquid continuous concentration filter provided in the embodiment is suitable for the solid-liquid separation process of various industrial production lines of solid-liquid two-phase process medium, and is also suitable for the filtration treatment of industrial wastewater containing small suspended solids. The industrial wastewater can be directly recycled or discharged to meet environmental standards, which is conducive to realizing green and environmentally friendly production methods.

[0102] In the overall filtration system, the cross-flow liquid continuous concentration filter provided in the embodiment can greatly reduce the medium processing flow of various solid-liquid separation equipment, thereby greatly improving the process efficiency, significantly saving the production process cost, and realizing long-term stable, maintenance-free, reliable and efficient operation, greatly reducing the labor maintenance cost, reducing the time and frequency of shutdown and maintenance, and thereby significantly improving the production efficiency of the production line.

[0103] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device described herein relative to the other device or structure is inverted, then a spatially relative term such as "above" can be interpreted as meaning "below" or "below" can be interpreted as meaning "above". The device can also be oriented in other ways (rotated at 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0104] In addition, it should be pointed out that the use of "first", "second" and the like words to qualify parts, is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present application.

[0105] The preferred embodiments of the present application have been described above with the specific details. Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and principle of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A crossflow liquid continuous concentration filter characterized by, The application relates to a filter device, which comprises a power assembly and a filter assembly. The power assembly comprises a driving member and a rotating shaft, and the driving member is connected to one end of the rotating shaft and drives the rotating shaft to rotate. The rotating shaft is arranged in the center of the filter assembly and extends along the axial direction of the filter assembly. The filter assembly comprises coaxially arranged rotating discs, flow guide plates and a first bottom plate.

2. The crossflow liquid continuous concentration filter of claim 1, wherein, The rotating discs are arranged in at least two and along the axial direction. The first bottom plate is arranged at the bottom of the rotating discs.

3. The crossflow liquid continuous concentration filter of claim 2, wherein, The flow guide plates are arranged between two adjacent rotating discs.

4. The cross-flow liquid continuous concentration filter according to claim 2 or 3, characterized in that The rotating discs are configured to rotate synchronously with the rotating shaft.

5. The crossflow liquid continuous concentration filter of claim 1 wherein, The rotating discs have a curved surface structure which protrudes towards the first bottom plate.

6. The crossflow liquid continuous concentration filter of claim 5, wherein, The flow guide plates and the first bottom plate are both in an inverted conical structure.

7. The crossflow liquid continuous concentration filter of claim 1 wherein, The flow guide plates have a material flow gap with the outer wall of the rotating shaft.

8. The crossflow liquid continuous concentration filter of claim 1 wherein, The filter assembly further comprises material guide box parts which are arranged one by one corresponding to the rotating discs. The material guide box parts are arranged around the outer periphery of the rotating discs and have radial material flow channels with the rotating discs. The material guide box parts are arranged along the axial direction and the material flow channels are connected with each other. The outer walls of adjacent material guide box parts are sealed and connected by gaskets.

9. The crossflow liquid continuous concentration filter of claim 1 wherein, The filter assembly further comprises material guide plates which are arranged one by one corresponding to the rotating discs. The material guide plates are arranged in a conical structure and are arranged in the material flow channels and around the outer edge of the rotating discs. The rotating discs comprise two rotating disc parts which are arranged in layers along the axial direction and a filter screen which is arranged in the axial gap between the two rotating disc parts. The rotating disc parts are provided with a plurality of through holes. The filter screen is provided with filter screen holes. Along the axial direction, the filter screen holes gradually decrease in size towards the first bottom plate. The rotating shaft is covered with a positioning shaft sleeve. The rotating discs are keyed connected with the rotating shaft. The bottom surface of the rotating discs is provided with a mesh structure reinforcing rib. The filter assembly further comprises a washing liquid pipe, a first liquid discharge pipe and a second liquid discharge pipe. One end of the washing liquid pipe is used for feeding washing liquid. The other end of the washing liquid pipe is connected with the inside of the filter assembly and is arranged at the top of the rotating discs. The first liquid discharge pipe is connected with the filtrate discharge pipe. The second liquid discharge pipe is connected with the concentrated liquid discharge pipe of the material pipe. The filter assembly and the power assembly are further provided with a conical top cover. The connecting part of the rotating shaft and the conical top cover is provided with a first sealing member. The first sealing member is arranged on the inner wall of the rotating shaft and is provided with a threaded groove. The top of the rotating shaft is provided with a first bearing. A sealing liquid injection plate and a sealing liquid discharge plate are arranged between the first sealing member and the first bearing from bottom to top; the sealing liquid injection plate forms a first annular gap with the rotating shaft in the radial direction, and the sealing liquid discharge plate forms a second annular gap with the rotating shaft in the radial direction; the sealing liquid injection plate is provided with a sealing liquid injection port communicating with the first annular gap, and the sealing liquid discharge plate is provided with a sealing liquid discharge port communicating with the second annular gap.

10. The crossflow liquid continuous concentration filter of claim 1 wherein, A second sealing member is arranged at the connection between the bottom of the rotating shaft and the filter assembly, and the second sealing member is provided with a threaded groove for contacting the inner wall of the rotating shaft; the bottom of the rotating shaft is further provided with a second bearing, and the second bearing is located below the second sealing member; A lubricating liquid inlet is communicated with a first closed area where the second bearing is located, and a sealing liquid inlet is communicated with a second closed area where the second sealing member is located; a sealing ring is arranged in the first closed area and the second closed area, the liquid pressure of the lubricating liquid in the first closed area is greater than the liquid pressure of the sealing liquid in the second closed area, and the liquid pressure of the sealing liquid in the second closed area is also greater than the liquid pressure in the filter assembly.

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