Low water reservoir type filter

Abstract

The application provides a low water storage tray type filter, which comprises a filtrate tank, a main shaft cylinder shaft, a water blocking flange, a clamping groove type filter fan, a main shaft transmission assembly, a distribution head, an overflow tank and a discharge tank; the air and liquid passage of the distribution head is arranged in the roller of the main shaft cylinder shaft, the arrayed transverse pipeline is corresponded to and communicated with the clamping groove type filter fan, and is used for sucking filtrate; a self-aligning roller bearing is selected to rollably support the rotating shaft of the main shaft cylinder shaft, which replaces the bearing bush in the prior art; the ratio of the roller diameter to the length of the clamping groove type filter fan is 5-6:1, the roller diameter of the main shaft cylinder shaft is increased, the length of the filter fan is reduced, the water blocking flanges are arranged at both ends of the filtrate tank, the slurry storage amount in the filtrate tank is reduced, the dehydration time is shortened, and the continuous load of the vacuum pump is reduced. The limiting ring and the nut are arranged on the bolt on the bearing seat, the positioning notch is arranged on the limiting ring, and the positioning notch is matched with the positioning groove on the mounting table of the clamping groove type filter fan, so that the clamping groove type filter fan is inserted and connected, and the nut and the bolt do not need to be completely disassembled.

Description

Technical Field

[0001] This invention relates to disc filters in the field of filtration machines, and particularly to a low-water-storage disc filter. Background Technology

[0002] Disc filters are used for solid-liquid separation and dewatering of solid powders, primarily in the beneficiation of iron ore or other minerals with high specific gravity. A disc filter consists of multiple circular filter discs, each composed of multiple filter panels evenly distributed at 360 degrees. The filter has three functional zones: 1. The adsorption zone, filled with slurry, adsorbs mineral powder onto the surface of the filter panels, while water permeates through the filter cloth into the filter panels and is then drawn out of the filter by a vacuum pump; 2. The drying zone, where the filter panels, after rotating out of the slurry tank with the main shaft, continue to have moisture drawn out from the inside and surface of the filter panels and discharged from the equipment; 3. Before entering the slurry tank, air is injected into the filter panels and blown backwards, causing the material to fall onto the belt conveyor below the filter. During filtration, the internal space of the filter panels serves as the air and water passage. Disc filters use a vacuum pump to draw the slurry being filtered, causing it to form a filter cake on a fan-shaped plate. The filtrate is then discharged from the inner cavity of the fan-shaped plate, achieving solid-liquid separation.

[0003] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: 1. The required mineral solution concentration for general-purpose filters is as high as 35-65%, while that for ceramic filters is as high as 55-68%.

[0004] 2. To evenly adsorb the solids within the filter chamber onto the filter panels, a mixing device is installed at the bottom of the filter chamber in general-purpose filters. During operation, the seals at both ends of the mixing device are in close contact with the slurry, resulting in a very short seal lifespan, sometimes as short as 70 days. While the pendulum agitator of ceramic filters can be adapted to general-purpose disc filters, the pendulum agitator falls far short of the mixing effect of a mixing blade and is also more expensive to manufacture.

[0005] 3. In order to increase output, the area of ​​the filter fan is increased, and the length of the filter fan is lengthened to increase the area. Due to the high solid content, the filter fan length of the 2-meter filter is 500mm and that of the 3.2-meter filter is 1000mm. It is difficult for the agitator to stir the slurry evenly, resulting in uneven material layer thickness during the adsorption process. In many cases, there is no material on the top of the filter fan, resulting in low output and excessive vacuum power consumption due to air leakage in the filter fan.

[0006] 4. Due to its structure and historical reasons, the bearings of general-purpose disc filters are made of tin-aluminum alloy or nylon. The bearings have several disadvantages: a. high energy consumption; b. short lifespan; c. need to be greased every working day; d. overflowing grease has a significant impact on the environment.

[0007] 5. Disc filters generally operate continuously for 24 hours. The power of the stirring motor varies from 3kw to 15kw depending on the filter model, and the electricity consumption is 24,000 to 90,000 kWh.

[0008] 6. Vacuum disc ceramic filter: Ceramic filters have many advantages, but the ceramic filter fan is prone to clogging. It needs to be cleaned with oxalic acid every 8 hours of operation and deep-cleaned for 4 hours after 72 hours of operation.

[0009] 7. Currently used filter tanks have overflow and loss of fine solids in the upper layer. Summary of the Invention

[0010] The embodiments of this application aim to at least solve one of the technical problems existing in the prior art. Therefore, one object of the embodiments of this application is to provide a low-water-storage disc filter.

[0011] The solution adopted by the embodiments of this application to solve the technical problem is: A low-water-storage disc filter includes a filtrate tank, a main shaft cylinder, a water-blocking flange, a slotted filter fan, a main shaft drive assembly, a distribution head, an overflow trough, and a discharge trough. The filtrate tank has a semi-section tank structure and is located on the frame of the filter machine. A feeder is provided at one end of the filtrate tank to transport the slurry contained therein to the slurry inlet side of the filtrate tank, and air-liquid separators are provided at both ends to separate the discharged filtrate into air and water. The main shaft consists of a rotating shaft and rollers, and is located at the top of the filtrate tank. Both ends are supported and fixed by rolling. The main shaft drive assembly is located on the side of the filtrate tank near the feeder, and is used to connect an external power source to drive the main shaft cylinder to rotate. The slotted filter fans are arranged on the main shaft to form filter discs, and the filter discs are arrayed on the main shaft. The distribution head is located at both ends of the main shaft. The distribution head has a venting and liquid-conducting pipe. The venting and liquid-conducting pipe is built into the rollers of the main shaft and is connected to the slotted filter fan through an array of horizontally arranged pipes for sucking up the filtrate. Water-blocking flanges are located at both inner ends of the filtrate tank, contacting the roller ends of the main shaft cylinder, to prevent slurry from entering the overflow side and reduce the amount of slurry stored in the filtrate tank; Overflow tanks are located at both outer ends of the filtrate tank for draining clean water from the overflow side of the filtrate tank; The discharge chute is located at the rear end of the overflow side of the filtrate tank and is staggered with the filter discs to collect the filter cake; The ratio of the roller diameter of the main shaft to the length of the slotted filter fan is 5-6:1. Water-blocking flanges are set at both ends of the filtrate tank to reduce the amount of slurry stored in the filtrate tank. The slotted filter fan below and above the roller is immersed in the slurry in the filtrate tank. The slotted filter fan adsorbs the solids in the slurry and forms a filter cake on the filter disc. The cake is then discharged on the conveyor belt through the discharge chute. The clear water in the slurry in the filtrate tank is divided into two parts. First, it enters the flow channel inside the slotted filter fan through the filter cake layer and filter cloth and is discharged through the air-water separator. Second, the clear water in the filtrate on the overflow side is discharged through the overflow chute.

[0012] In order to further solve the technical problems to be solved by the embodiments of this application, the main spindle cylinder provided in the embodiments of this application has distribution ventilation and liquid supply bushings at both ends, and is supported by bearings. The distribution ventilation and liquid supply bushings are fitted on the rotating shaft of the main spindle cylinder, and the bearings are self-aligning roller bearings.

[0013] Furthermore, the distribution head includes a static ceramic friction ring, a dynamic ceramic friction ring, and a venting and liquid-conducting pipe; A moving ceramic friction ring is installed at the end of the distribution air-fluid bushing, rotating with the main shaft. A stationary ceramic friction ring is installed outside the moving ceramic friction ring. One end of the stationary ceramic friction ring is connected to the air-water separator, and the other end is connected to the moving ceramic friction ring. It can be used to draw in or blow air through the corresponding air port to achieve adsorption or unloading. The air ports on the stationary ceramic friction ring are connected to air-fluid pipes. The air-fluid pipes are built into an array in the roller and are connected to the slotted filter fans on the filter disc through the horizontally arranged pipe array. Each filter disc corresponds to one air-fluid pipe. The static ceramic friction ring is equipped with an upper water and air discharge port, a lower water and air discharge port, and a reverse air port. When the slotted filter fan is immersed in the adsorption zone, solids are adsorbed onto the surface of the slotted filter fan, while water passes through the filter cloth into the interior of the slotted filter fan and is then drawn out of the filter machine by a vacuum pump through the lower water and air discharge port. When the slotted filter fan rotates out of the filtrate tank and into the drying zone with the main shaft, the vacuum pump continues to draw out the moisture from the inside and surface of the slotted filter fan through the upper water and air discharge port and discharge it out of the filter machine. When the slotted filter fan rotates out of the drying zone with the main shaft, air is injected into the slotted filter fan through the reverse air port and blown back, causing the material to fall onto the belt conveyor below the filter machine.

[0014] Furthermore, the water-blocking flange has a semi-circular arc structure, and an inclined baffle is provided radially on the water-blocking flange. The baffle is a rubber plate embedded in the end face of the water-blocking flange to contact the roller end of the main shaft and prevent slurry from entering the overflow side. The baffle is located on the front side of the water-blocking flange, and the end of the baffle closer to the center of the water-blocking flange is farther away from the axial center line of the main shaft compared to the other end. The top of the water-blocking flange on the slurry inlet side has an inclined structure and gradually rises radially along the water-blocking flange. The top of the water-blocking flange on the overflow side has a straight structure. The top of the water-blocking flange on the slurry inlet side is higher than the top of the water-blocking flange on the overflow side. A slope plate is provided at the lower part of the water-blocking flange in the filtrate tank.

[0015] Furthermore, the overflow trough has a funnel structure, which is set at both ends of the filtrate tank and connected to it by a connecting pipe. The overflow trough is connected to the filtrate tank through an overflow port. The overflow port is set on the overflow side of the filtrate tank. The height of the overflow port is lower than the filtrate tank, higher than the top of the water-blocking flange on the overflow side, and lower than the top of the water-blocking flange on the slurry inlet side. When the roller of the main shaft enters the slurry in the overflow trough and passes through the adsorption zone, the solids in the slurry are adsorbed onto the filter disc to form a filter cake. The clear water on the overflow side flows through the overflow port to the overflow trough and is discharged.

[0016] Furthermore, it also includes grooved discs, which are arrayed at the bottom of the filtrate tank and intersect with the filter discs formed by the slotted filter fans on the main shaft, forming a channel for filter disc adsorption. The grooved discs are circular arc hollow closed structures and are lower than the roller diameter of the main shaft. The cross-section of the grooved discs is trapezoidal, forming V-shaped grooves on both sides of the filter discs. This coordinates the rollers of the main shaft and the water-blocking flange to jointly suppress the slurry concentration in the V-shaped grooves, forming a high concentration of slurry in the V-shaped grooves. A through groove is provided at the bottom of the grooved discs to connect the grooved discs.

[0017] Furthermore, the slotted filter fan includes a filter fan body, and two filter fan bodies are connected to form an integral disc filter. The slotted filter fan body includes an outer frame, a web, a slot, an external vent, an intake port, a mounting base, a spacer column, an inner frame, and an internal vent. The outer frame has a fan-shaped structure, serving as the external outline of the filter fan body. It has a large end and a small end, used to assemble the filter cloth on the filter press to form a filter disc. The web is located inside the outer frame on the front of the filter fan body, forming a support with the outer frame. The external vents are obliquely placed on the web, arranged in a mirror array with the center line of the filter fan body as the center, and are blind holes. The internal vents are embedded in the external vents, forming through-hole structures, creating ventilation and dehydration channels on both sides of the filter fan. The slot is an open groove at the top, located between the outer frame and the external vents. Between the holes, the external vent holes are closed to form an independent unit for mounting filter cloth on the filter fan body; the mounting base is set at both ends of the small end of the outer frame for inserting the filter fan onto the roller of the main shaft to form a filter disc; the suction outlet is arranged inside the mounting base and symmetrically distributed around the center line of the filter fan body for ventilation and drainage; the inner frame is set on the back of the filter fan body, inside the outer frame, to form an independent receiving cavity; the spacer is set in the receiving cavity on the back of the web plate and is arranged alternately with the internal vent holes to support the web plate; The filter cloth consists of two single pieces corresponding to the outline of the filter fan. The slot is equipped with a clip to embed and fix the filter cloth. The spacer columns arranged on the back of the web reduce the water storage space inside the filter fan, so that the water storage volume is reduced when the filter fan enters the drying zone. The suction port is moved from the middle position of the small end of the filter fan to both ends adjacent to the small end of the filter fan. When the filter fan enters the drying zone, the suction port is located at the lower part of the filter fan, which facilitates the rapid discharge of water stored inside the filter fan.

[0018] Furthermore, the filter cloth of the slot-type filter fan is a single piece of woven filter cloth that corresponds to the outline of the filter fan. It is fixed by embedding it into the slot with a clip, so that the whole filter cloth does not need to be replaced if one side of the filter cloth is damaged.

[0019] Furthermore, the mounting base includes a mounting platform and an insertion slot; the insertion slot is a semi-circular arc groove. When two adjacent filter fans are connected, they only need to be inserted together, and the two semi-circular arc grooves close to form a bolt assembly mounting slot, which is then locked and fixed by the bolt assembly; a mounting platform is provided on the upper surface of the insertion slot to support the bolt assembly, and a positioning groove is provided on the mounting platform for positioning when two slot-type filter fans are connected; when disassembling the filter fan, the bolt assembly is loosened, and the filter fan can be pulled out radially along the main shaft of the filter press.

[0020] Furthermore, the insert supports are arranged in a circumferential array on the rollers of the main shaft for inserting slotted filter fans. The insert supports include a bearing seat, bolts, nuts, and a limiting ring. The bearing seat is a structural plate arranged in a circumferential array on the rollers of the main shaft. The lower part of the bearing seat is connected to the rollers of the main shaft, and the upper part has a through hole. The bolt passes through the through hole to limit the connection between the two slotted filter fans. The limiting ring is a round washer fitted onto the bolt. The limiting ring has a positioning stop that cooperates with the positioning groove on the mounting platform of the slotted filter fan. When the nut and bolt are screwed together, rotating the nut pushes the positioning stop of the limiting ring into the positioning groove of the two slotted filter fans, tightening the nut and connecting the two slotted filter fans together. When the nut is loosened and the limiting ring is removed, the slotted filter fan can be pulled out radially from the rollers of the main shaft without completely disassembling the nut and bolt. Among them, the bolts are hexagonal head reamed bolts.

[0021] Positive effects: The technical solutions provided in this application embodiment have at least the following technical effects or advantages: 1. Because the embodiments of this application adopt the technical means of increasing the roller diameter of the main shaft cylinder and the length of the slotted filter fan by 5 to 6:1, increasing the roller diameter of the main shaft cylinder and reducing the length of the filter fan, and setting water-blocking flanges at both ends of the filtrate tank to reduce the amount of slurry stored in the filtrate tank; it effectively solves the technical problem of high slurry concentration in the disc filter in the prior art, improves the filter cake formation thickness, shortens the dewatering time, reduces the continuous load of the vacuum pump, and thus achieves the technical effect of energy saving and efficiency improvement.

[0022] 2. Because the embodiments of this application adopt the technical means of using self-aligning roller bearings to roll and support the rotating shaft of the main shaft, the shortcomings of the existing bearing bushes are avoided, and the bearing bushes in the existing technology are replaced, thereby achieving the technical effect of improving the bearing capacity of the main shaft.

[0023] 3. Because the embodiment of this application adopts the technical means of setting the ventilation and liquid passage pipe inside the roller of the main shaft, it can effectively extend the radial dimension of the main shaft. The ventilation and liquid passage pipe is connected to the slotted filter fan on the filter plate through the horizontal pipe, and one filter plate corresponds to one ventilation and liquid passage pipe. With the increase of the roller diameter of the main shaft, the technical effect of increasing the roller of the main shaft and the water-blocking flange to jointly prevent the slurry from entering the overflow side is achieved.

[0024] 4. Because the embodiments of this application adopt the technical means of using a semi-circular arc structure for the water-blocking flange and setting it at both ends of the filtrate tank, and enlarging the main shaft cylinder assembly, it can prevent the slurry entering the filtrate tank from entering the overflow side, thus solving the problem of fine solids overflow.

[0025] 5. Because this application embodiment adopts the technical means of setting grooved discs at the bottom of the filtrate tank, the grooved disc array is in the lower part of the filtrate tank and intersects with the filter discs formed by the slotted filter fans on the main shaft, forming a channel for filter disc adsorption; the grooved disc is lower than the roller diameter of the main shaft, the cross-section is trapezoidal, and V-shaped grooves are formed at both ends of the filter disc; due to the double volume compression of the V-shaped groove and the roller of the large main shaft, as well as the gravity of the solid content, a high concentration zone with a solid content of up to 65-80% is formed in the V-shaped groove of the filtrate tank 100 with a feed concentration of 50%, and the filter disc can quickly form a filter cake thickness of 16mm after passing through the V-shaped groove; a high concentration zone with a solid content of up to 47-60% is formed in the V-shaped groove of the filtrate tank 100 with a feed concentration of 30%, and the filter disc can quickly form a filter cake thickness of 11mm after passing through the V-shaped groove, providing the first technical support for energy saving. Meanwhile, the clear water in the slurry is divided into two parts. One part passes through the filter cake layer and filter cloth into the filter fan and is discharged outside the filter. The other part enters the overflow area through the V-shaped groove and is then discharged through the overflow pipe. Due to the rapid formation of the filter cake, the relatively thick filter fan, and the small area of ​​the short filter fan, the proportion of clear water entering the filter fan is reduced by about 45%. This allows the reduced clear water in the filter fan to be discharged through the overflow port, reducing the load on the vacuum pump and providing a second technical support for energy saving. A through groove is set at the bottom of the grooved discs to connect the grooved discs, allowing the slurry in the high-concentration zone at the bottom of the filtrate tank to circulate and empty the slurry channel. This achieves the technical effect of eliminating the mixing device in the existing technology, realizing a third energy-saving technical support by eliminating the 3-15KW stirring motor and effectively solving the technical problem of slurry leakage in the existing disc filter with stirring device.

[0026] 6. As this application embodiment adopts the technical means of reducing the internal water storage space of the filter fan by using spacer columns arranged on the back of the web plate, when the filter fan enters the drying zone, the suction port is located at the lower part of the filter fan. The filtrate suction path is short and the residual water retention is extremely low. After the filter fan exits the liquid surface, it can quickly complete dehydration and drying, shorten the dehydration time, eliminate the ineffective work of the vacuum pump, provide a fourth technology for energy saving, and improve the filter cake thickness and filtration capacity.

[0027] 7. Because the embodiments of this application employ a technical means in which the bolts on the bearing seat are provided with a limiting ring and a nut, and the limiting ring is provided with a positioning stop that cooperates with the positioning groove on the mounting platform of the slotted filter fan, when the nut and the bolt are screwed together, rotating the nut pushes the positioning stop of the limiting ring into the positioning groove of the two slotted filter fans, thus connecting the two slotted filter fans together; when the nut is loosened and the limiting ring is removed, the slotted filter fan can be radially pulled out from the roller of the main shaft; the slotted filter fan is installed by inserting a support, which effectively solves the technical problem of troublesome filter fan installation and disassembly in the prior art, and achieves the technical effect of quick insertion and removal of the slotted filter fan without completely disassembling the nut and bolt.

[0028] It is suitable for use as a low-water-storage disc filter. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is the northwest isometric side view of this embodiment; Figure 2 This is the front view of this embodiment; Figure 3 This is a top view of this embodiment; Figure 4 This is a side view of this embodiment; Figure 5 This is a front sectional view of this embodiment; Figure 6 This is a partial enlarged view of Embodiment I; Figure 7 This is the southwest isometric side view of the filtrate tank; Figure 8 This is an isometric side view of the southeast side of the filtrate tank. Figure 9 This is an isometric side view of the main sectional section of the filtrate tank; Figure 10 This is a partial enlarged view of Embodiment II; Figure 11 This is a larger image of a portion of Embodiment III; Figure 12 Top view of the filtrate tank; Figure 13 This is an isometric side view of a slotted filter fan; Figure 14 A larger image of a portion of Example IV is provided. Figure 15 This is a larger image of a portion of embodiment V; Figure 16 This is a schematic diagram of the insert support structure.

[0031] In the picture: 100. Filtration tank; 110. Slope plate; 200. Main shaft cylinder; 210. Distribution venting and fluid supply sleeve; 220. Bearing; 300. Water-retaining flange; 310. Baffle; 400. Slotted filter fan; 410. Outer frame; 420. Web plate; 430. Slot; 440. External vent; 450. Suction outlet; 460. Mounting base; 461. Mounting platform; 462. Insert slot; 470. Insert support; 471. Bearing seat; 472. Bolt; 473. Nut; 474. Limiting ring; 500. Spindle drive assembly; 600. Distributor head; 610. Static ceramic friction ring; 620. Dynamic ceramic friction ring; 630. Ventilation and liquid inlet pipe; 700. Overflow channel; 710. Overflow outlet; 800. Grooved disc; 810. Through groove; 900. Unloading chute. Detailed Implementation

[0032] 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. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] according to Figure 1-16 As shown, a low-water-storage disc filter includes a filtrate tank 100, a main shaft cylinder 200, a water-blocking flange 300, a slotted filter fan 400, a main shaft transmission assembly 500, a distribution head 600, an overflow trough 700, and a discharge trough 900. The filtrate tank 100 has a semi-sectional tank structure and is located on the frame of the filter machine. A feeder is provided at one end of the filtrate tank 100 to transport the slurry contained therein to the slurry inlet side of the filtrate tank 100, and gas-liquid separators are provided at both ends to separate the discharged filtrate into gas and water. In this embodiment, the front side of the filtrate tank 100 is the slurry inlet side and the rear side is the overflow side. The main shaft 200 is composed of a rotating shaft and a roller, and is set on the upper part of the filtrate tank 100. Both ends are supported and fixed by rolling. The main shaft drive assembly 500 is located on the side of the filtrate tank 100 near the feeder and is used to connect an external power source to drive the main shaft cylinder 200 to rotate. The slotted filter fans 400 are arranged on the main shaft cylinder 200 to form filter discs, and the filter discs are arrayed on the main shaft cylinder 200; The distribution head 600 is located at both ends of the main shaft cylinder 200. The distribution head 600 has an air and liquid passage pipe 630, which is built into the rollers of the main shaft cylinder 200 and is connected to the slotted filter fan 400 through an array of horizontally arranged pipes for sucking up filtrate. The water-blocking flange 300 is located at both inner ends of the filtrate tank 100 and contacts the roller end of the main shaft cylinder 200. It is used to prevent slurry from entering the overflow side and to reduce the amount of slurry stored in the filtrate tank 200. Overflow tanks 700 are located at both outer ends of the filtrate tank 100 for the discharge of clean water from the overflow side of the filtrate tank 100; The discharge trough 900 is located at the rear end of the overflow side of the filtrate tank 100 and is interspersed with the filter disc to collect the filter cake; In this design, the ratio of the roller diameter of the main shaft cylinder 200 to the length of the slotted filter fan 400 is 5-6:1. Unlike existing technologies, this design increases the roller diameter of the main shaft cylinder 200 and decreases the length of the filter fan, thereby reducing the water storage volume in the filtrate tank 100. Simultaneously, water-blocking flanges 300 are installed at both ends of the filtrate tank 100 to reduce the amount of slurry stored in the filtrate tank 100. Under the compression of the roller volume of the main shaft cylinder 200 and the effect of gravity, a high-concentration zone of slurry solids is formed at the bottom of the filtrate tank 100, effectively solving the technical problem of high slurry concentration in the disc-type filter press in existing technologies. The slotted filter fan 400 below and above the roller is immersed in the slurry in the filtrate tank 100. The slotted filter fan 400 adsorbs the solids in the slurry and forms a filter cake on the filter disc, which is then detached from the discharge chute 900 and transported away on the conveyor belt, achieving solid-liquid separation and providing the first technical support for energy saving. The clear water in the slurry in the filtrate tank 100 is divided into two parts. First, it enters the flow channel inside the slotted filter fan 400 through the filter cake layer and filter cloth and is discharged after being drained and degassed by the air-water separator. Second, the clear water in the filtrate retained on the overflow side is discharged through the overflow tank 700. Due to the rapid formation of the filter cake, the relatively thick filter cake, and the short area of ​​the filter fan, the proportion of clear water entering the slotted filter fan 400 is reduced by about 45%. This allows the clear water reduced by the slotted filter fan 400 to be discharged through the overflow tank 700, reducing the load on the vacuum pump and providing a second technical support for energy saving, thus achieving continuous and stable filtration operation.

[0034] In the prior art, the roller of the 2M specification filter is Φ500mm and the length of the filter fan is 500mm, with a roller diameter to filter fan length ratio of 1:1. The filter fan is relatively long, resulting in uneven thickness of the filter cake layer adsorbed on the upper part of the filter fan. In this embodiment, the filter disc (composed of slotted filter fans 400) of the filter machine has a diameter of Φ2400mm, the roller of the filter machine is Φ1600mm and the length of the filter fan is 270mm, with a roller diameter to filter fan length ratio of 5 to 6:1. This increases the roller diameter of the main shaft 200 and reduces the length of the filter fan. The lower part of the roller and the slotted filter fans 400 above it are immersed in the high-concentration slurry at the bottom of the filtrate tank 100, reducing the continuous load on the vacuum pump. This effectively solves the technical problem of high slurry concentration in the disc filter in the prior art, achieving energy saving and efficiency improvement.

[0035] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: In this embodiment, the ratio of the roller diameter of the main shaft cylinder 200 to the length of the slotted filter fan 400 is 5 to 6:1, which increases the roller diameter of the main shaft cylinder 200 and decreases the length of the filter fan; By increasing the diameter of the roller of the main shaft 200, the lower part of the roller and the slotted filter fan 400 above it are immersed in the slurry of the filtrate tank 100. With the rotation of the roller, the slurry flows evenly and is distributed without stratification and sedimentation, thus ensuring the continuity and stability of the filtration operation. By reducing the length of the slotted filter fan 400, the internal water storage space of the filter fan can be reduced, the filtrate suction path is short, the residual water retention is extremely low, and the filter fan can quickly complete dehydration and drying after exiting the liquid surface, shortening the dehydration time, eliminating the ineffective work of the vacuum pump, and improving the filter cake size and filtration capacity. Because the filtrate tank 100 is equipped with water-blocking flanges 300 at both ends, the slurry is prevented from directly entering the overflow area. The clear water in the filtrate on the overflow side is discharged through the overflow tank 700, which solves the problem of overflow of fine solids.

[0036] To ensure the stability of the implementation structure in this example, please refer to the appendix of the instruction manual. Figure 5-6 The main shaft 200 is provided with distribution ventilation and liquid supply bushings 210 at both ends, and is supported by bearings 220. The distribution ventilation and liquid supply bushings 210 are mounted on the rotating shaft of the main shaft 200, and the bearings 220 are self-aligning roller bearings.

[0037] In existing technology, the rollers of the 2M specification filter are Φ500mm and the filter fan is 500mm long. The filter fan is relatively long, resulting in uneven thickness of the filter cake layer adsorbed on the upper part of the filter fan. Because the filter shaft and roller are matched, the diameter of the filter shaft end is also relatively large. Rolling support is usually provided by bearing bushes, which are generally made of tin-aluminum alloy or nylon. However, bearing bushes have the following disadvantages: a. high energy consumption; b. short lifespan; c. need to be greased every working day; d. overflowing grease affects the environment. In this embodiment, the filter disc (composed of filter fans) of the 2M specification filter has a diameter of Φ2400mm, the roller of the filter has a diameter of Φ1600mm, the length of the filter fan is 270mm, and the ratio of roller diameter to filter fan length is 5 to 6:1. By increasing the roller diameter, self-aligning roller bearings are selected and assembled on the distribution ventilation and liquid circulation bushing 210 to achieve rolling support of the main shaft cylinder 200 and improve the load-bearing capacity of the main shaft cylinder 200.

[0038] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: In this embodiment, the self-aligning roller bearing is selected to roll and support the shaft of the main shaft 200, thus replacing the bearing bush in the prior art and improving the load-bearing capacity of the main shaft 200.

[0039] To further ensure the airtightness of the vacuum system in this embodiment, please refer to the appendix to the instruction manual. Figure 5-6 The dispensing head 600 includes a static ceramic friction ring 610, a dynamic ceramic friction ring 620, and a venting and liquid-conducting pipe 630. At both ends of the main shaft 200, bearings 220 are mounted on the distribution air-fluid-transmitting bushings 210 for rolling support. A moving ceramic friction ring 620 is provided at the end of the distribution air-fluid-transmitting bushings 210 to rotate with the main shaft 200. A stationary ceramic friction ring 610 is provided outside the moving ceramic friction ring 620. One end of the stationary ceramic friction ring 610 is connected to the air-water separator, and the other end is connected to the moving ceramic friction ring 620. It can be used to draw in or blow air through the corresponding air port to achieve adsorption or unloading. The air ports on the stationary ceramic friction ring 610 are respectively connected to the air-fluid-transmitting pipes 630. The air-fluid-transmitting pipes 630 are built into the roller and are connected to the slotted filter fans 400 on the filter disc through the horizontally arranged pipe array. Each filter disc corresponds to one air-fluid-transmitting pipe 630. The static ceramic friction ring 610 is equipped with an upper water and air discharge port, a lower water and air discharge port, and a reverse air port. When the slotted filter fan 400 is immersed in the adsorption zone, solids are adsorbed onto the surface of the slotted filter fan 400, while water passes through the filter cloth into the interior of the slotted filter fan 400 and is drawn out of the filter by a vacuum pump through the lower water and air discharge port. When the slotted filter fan 400 rotates out of the filtrate tank 100 and enters the drying zone with the main shaft cylinder 200, the vacuum pump through the upper water and air discharge port continues to draw out the material moisture from the interior and surface of the slotted filter fan 400 and discharge it out of the filter. When the slotted filter fan 400 rotates out of the drying zone with the main shaft cylinder 200, air is injected into the filter fan through the reverse air port and blown back, causing the material to fall onto the belt conveyor below the filter.

[0040] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: In the prior art, the ventilation and liquid passage pipe 630 is located on the outside of the roller of the main shaft cylinder 200, and one row of filter fans corresponds to one ventilation and liquid passage pipe 630. In this embodiment, the ventilation and liquid passage pipe 630 is connected to the slotted filter fan 400 on the filter plate through a horizontally placed pipe, and one filter plate corresponds to one ventilation and liquid passage pipe 630. When the roller diameter of the main shaft cylinder 200 is increased, the ventilation and liquid passage pipe 630 can be built into the roller, which can effectively extend the radial dimension of the main shaft cylinder. When the roller diameter of the main shaft cylinder is increased, the technical effect of increasing the roller diameter of the main shaft cylinder and the water-blocking flange to jointly prevent the slurry from entering the overflow side is achieved.

[0041] To optimize the structure of this embodiment, please refer to the appendix to the specification. Figure 7-10 The water-blocking flange 300 has a semi-circular arc structure. An inclined baffle 310 is provided radially on the water-blocking flange 300. The baffle 310 is a rubber plate and is embedded in the end face of the water-blocking flange 300 to contact the roller end of the main shaft cylinder 200 and prevent slurry from entering the overflow side. The baffle 310 is located on the front side of the water-blocking flange 300, and the end near the center of the water-blocking flange 300 is farther away from the axial center line of the main shaft cylinder 200 than the other end. The top of the water-blocking flange 300 on the slurry inlet side has an inclined structure and gradually rises radially along the water-blocking flange 300. The top of the water-blocking flange 300 on the overflow side has a straight structure. The top of the water-blocking flange 300 on the slurry inlet side is higher than the top of the water-blocking flange 300 on the overflow side to prevent slurry entering the filtrate tank 100 from entering the overflow side.

[0042] To further optimize the structure of this embodiment, please refer to the appendix to the specification. Figure 9 A slope plate 110 is provided at the lower part of the water-blocking flange 300 at the inner end of the filtrate tank 100. This serves two purposes: first, to increase the concentration of the slurry in the filtrate tank 100; and second, to reduce the volume of the filtrate tank 100, facilitating the circulation of the mineral liquid in the filtrate tank 100 and enabling filtration operations with low water storage.

[0043] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: Because the water-blocking flange 300 has a semi-circular arc structure and is set on both sides of the filtrate tank 100, the water storage volume in the filtrate tank 100 is reduced, thereby reducing the amount of slurry stored in the filtrate tank 100 and increasing the slurry concentration in the filtrate tank 100. At the same time, the top of the water-blocking flange 300 on the slurry inlet side is higher than the top of the water-blocking flange 300 on the overflow side, preventing the slurry entering the filtrate tank 100 from entering the overflow side. As a result, the slurry flows and spreads out by itself, thus enabling high-concentration slurry to be filtered, thereby broadening the application range.

[0044] Preferably, see the appendix to the instruction manual. Figure 7-10 The overflow trough 700 has a funnel structure and is located at both ends of the filtrate tank 100 and connected by a connecting pipe. The overflow trough 700 is connected to the filtrate tank 100 through the overflow port 710. The overflow port 710 is located on the overflow side of the filtrate tank 100. The height of the overflow port 710 is lower than the filtrate tank 100, higher than the top of the overflow side water-blocking flange 300, and lower than the top of the slurry inlet side water-blocking flange. When the roller of the main shaft cylinder 200 enters the slurry in the overflow trough 700 and passes through the adsorption zone, the solids in the slurry are adsorbed onto the filter disc to form a filter cake. The clear water on the overflow side flows through the overflow port 710 to the overflow trough 700 and is discharged.

[0045] To further optimize the structure of this embodiment, please refer to the appendix to the specification. Figure 7-12 A low-water-storage disc filter also includes grooved discs 800. The grooved discs 800 are arrayed at the lower part of the filtrate tank 100 and intersect with the filter discs formed by the slotted filter fans 400 on the main shaft 200, forming a channel for filter disc adsorption. The grooved discs 800 are arc-shaped, hollow, and closed structures, and are lower than the roller diameter of the main shaft 200. The cross-section of the grooved discs 800 is trapezoidal, forming V-shaped grooves on both sides of the filter discs. These grooves coordinate with the rollers of the main shaft 200 and the water-blocking flange 300 to jointly suppress the slurry concentration within the V-shaped grooves, resulting in a high-concentration slurry in the V-shaped grooves. Testing shows that a feed concentration of 50% results in a high slurry concentration within the filter. In the V-shaped groove of the filtrate tank 100, a high-concentration zone with a solid content of up to 65-80% is formed. The filter disc can quickly form a filter cake with a thickness of 16mm after passing through the V-shaped groove. In the filtrate tank 100 with a feed concentration of 30%, a high-concentration zone with a solid content of up to 47-60% is formed. The filter disc can quickly form a filter cake with a thickness of 11mm after passing through the V-shaped groove. Due to the effect of gravity, the concentration of slurry at the bottom of the filtrate tank 100 is high. A through groove 810 is provided at the bottom of the grooved plate 800 to connect the grooved plates 800, so that the slurry in the high-concentration zone at the bottom of the filtrate tank 100 can flow.

[0046] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: Because the groove 810 is provided at the bottom of the grooved disc 800, the grooved discs 800 are connected to each other, so that the slurry in the high concentration zone at the bottom of the filtrate tank 100 can flow and the slurry channel can be emptied. This achieves the technical effect of eliminating the mixing device in the prior art, and provides a third technical support for energy saving. It eliminates the need for the 3-15KW stirring motor and effectively solves the technical problem of slurry leakage in the disc filter with the stirring device in the prior art.

[0047] As a conventional technical option, refer to the appendix of the instruction manual. Figure 13-14 The slotted filter fan 400 includes a filter fan body, and two filter fan bodies are connected to form an integral disc filter. The filter fan body includes an outer frame 410, a web plate 420, a slot 430, an external vent 440, a suction outlet 450, a mounting base 460, a spacer column, an inner frame, and an internal vent. The outer frame 410 has a fan-shaped structure, which serves as the outer contour of the filter fan body. It has a large end and a small end, and is used to assemble filter cloth on the filter to form a filter disc. The web plate 420 is located inside the outer frame 410 on the front side of the filter fan body, forming a support with the outer frame 410; The external vent 440 is obliquely placed on the web plate 420, and is arranged in a mirror array with the center line of the filter fan body as the center, and is a blind hole structure. The internal vent is embedded in the external vent 440, forming a through-hole structure that creates ventilation and dehydration channels on both sides of the filter fan for ventilation and dehydration. The slot 430 is an open slot at the top, located between the outer frame 410 and the external vent 440, and closes the external vent 440 to form an independent unit for mounting filter cloth on the filter fan body. Mounting bases 460 are located at both ends of the small end of the outer frame 410 and are used to insert the filter fan onto the roller of the main shaft 200 to form a filter disc; The suction outlets 450 are arranged inside the mounting base 460 and are symmetrically distributed with the center line of the filter fan body as the center, for ventilation and drainage. The inner frame is located on the back of the filter fan body, inside the outer frame 410, forming an independent accommodating cavity; Spacer columns are arranged in the receiving cavity on the back of the web 420, and are arranged alternately with the internal vent holes to support the web 420. The filter cloth consists of two single pieces corresponding to the outline of the filter fan. The slot 430 is equipped with a clip to embed and fix the filter cloth. The fit between the filter cloth and the surface of the filter fan is stable and reliable. There is no leakage under negative pressure and the vacuum degree is stable, avoiding the problems of air leakage and filtration efficiency reduction of traditional filter fans. The spacers arranged on the back of the web 420 reduce the water storage space inside the filter fan, thus reducing the amount of water stored when the filter fan enters the drying zone and lowering the vacuum load on the filter fan in the drying zone. The suction port 450 is moved from the middle position of the small end of the filter fan to both ends adjacent to the small end of the filter fan. In this embodiment, only one suction port 450 is connected to the air and liquid pipe 630. When the filter fan enters the drying zone, the suction port 450 is located at the lower part of the filter fan, which facilitates the rapid discharge of water stored inside the filter fan and improves the working efficiency of the disc filter.

[0048] Specifically, the filter cloth of the slot-type filter fan 400 is a single piece of woven filter cloth that corresponds to the outline of the filter fan. It is fixed by embedding it into the slot 430 with a clip. If the filter cloth on one side is damaged, the whole filter fan does not need to be replaced.

[0049] In this embodiment, the slotted filter fan 400 has only one suction port 450 connected to the air and liquid passage pipe 630.

[0050] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: Because the spacers arranged on the back of the web 420 reduce the internal water storage space of the slotted filter fan 400, when the slotted filter fan 400 enters the drying zone, the suction outlet 450 is located at the lower part of the slotted filter fan 400. The filtrate suction path is short and the residual water retention is extremely low. After the slotted filter fan 400 exits the liquid surface, it can quickly complete dehydration and drying, shorten the dehydration time, eliminate the ineffective work of the vacuum pump, provide the fourth technical support for energy saving, and improve the filter cake size and filtration capacity.

[0051] Mounting base 460 includes mounting platform 461 and insertion slot 462; insertion slot 462 is a semi-circular arc slot. When two adjacent filter fans are connected, they only need to be inserted together, and the two semi-circular arc slots close to form a bolt assembly mounting slot, which is then locked and fixed by the bolt assembly; mounting platform 461 is provided on the upper plane of insertion slot 462 to support the bolt assembly. The mounting platform 461 is provided with a positioning slot for positioning when two slot-type filter fans 400 are connected; when disassembling the filter fan, the bolt assembly is loosened, and the filter fan can be pulled out radially along the main shaft of the filter, which is quick and convenient and improves work efficiency.

[0052] Refer to the instruction manual appendix Figure 15-16The insert support 470 is circumferentially arrayed on the roller of the main shaft 200 for inserting the slotted filter fan 400. The insert support 470 includes a bearing seat 471, a bolt 472, a nut 473, and a limiting ring 474. The bearing seat 471 is a structural plate, circumferentially arrayed on the roller of the main shaft 200. The lower part of the bearing seat 471 is connected to the roller of the main shaft 200, and the upper part is provided with a through hole. The bolt 472 passes through the through hole to form a limiting position for the connection of the two slotted filter fans 400. The limiting ring 474 is a round washer, fitted on the bolt 472, and has a setting on the limiting ring 474. The positioning stop and the positioning groove on the mounting platform 461 of the slotted filter fan 400 are mutually engaged; when the nut 473 and the bolt 472 are screwed together, rotating the nut 473 pushes the positioning stop of the limit ring 474 into the positioning groove of the two slotted filter fans 400, tightens the nut 473, and connects the two slotted filter fans 400 together; when the nut 473 is loosened and the limit ring 474 is removed, the slotted filter fan 400 can be pulled out radially from the roller of the main shaft 200 without completely disassembling the nut 473 and the bolt 472; wherein, the bolt 472 is a hexagonal head reamed hole bolt.

[0053] The technical solutions provided in this application embodiment have at least the following technical effects or advantages: Because the bolt 472 on the bearing seat 471 is equipped with a limiting ring 474 and a nut 473, and the limiting ring 474 is equipped with a positioning stop that cooperates with the positioning groove on the mounting platform 461 in the slotted filter fan 400; therefore, when the nut 473 is screwed with the bolt 472, rotating the nut 473 pushes the positioning stop of the limiting ring 474 into the positioning groove of the two slotted filter fans 400, thus connecting the two slotted filter fans 400 together; when the nut 473 is loosened and the limiting ring 474 is removed, the slotted filter fan 400 can be pulled out radially from the roller of the main shaft 200; the slotted filter fan 400 can be inserted and installed through the insertion support 470, without completely disassembling the nut 473 and the bolt 472, thus achieving quick insertion and removal of the slotted filter fan 400.

[0054] The working principle of this embodiment: A slurry with a concentration exceeding 25% enters the filtrate tank 100. Each filter disc at the bottom of the filtrate tank 100 has a V-shaped groove along its path via the grooved disc 800. Because the slurry's solid content is 2.2-2.8 times greater than water, the material quickly enters the V-shaped groove, forming a high-concentration mineral zone. This high-concentration mineral zone is the adsorption zone of the filter. The V-shaped groove increases the height of the high-concentration slurry zone within the filtrate tank 100. Simultaneously, the rollers of the main shaft 200 are designed with a large diameter, and the filter discs 400 are designed with short filter discs. Water-blocking flanges 300 are provided at both ends of the inner side of the filtrate tank 100. The large-diameter roller portion penetrates the slurry, increasing the pressure on the upper part of the slurry and facilitating the overflow of clear water. The filter discs 400 rotate with the main shaft 200 and enter the high-concentration adsorption zone, where they efficiently adsorb mineral materials under vacuum.

[0055] Features of this embodiment: 1. This example is highly efficient and energy-saving, featuring two functional combination structures. The first combination consists of the rollers of the large main shaft 200, the water-blocking flange 300, and the overflow port 710 located at the rear of the filtrate tank 100, increasing the overflow volume of clean water. The second combination comprises the rollers of the large main shaft 200, the short grooved filter fan 400, and a V-shaped channel, allowing the filter disc to quickly form a filter cake through the high-concentration slurry zone. It incorporates two low-water-storage structures: one in the tank structure to quickly draw solids onto the filter disc to form the filter cake; and the other in the filter fan's internal structure designed for low water storage and low residual water when the filter fan exits the feeding area. These two combinations and the two low-water-storage structures eliminate the need for a stirring device, collectively achieving energy savings of 35-65% (compared to general filter cloth disc filters).

[0056] 2. It can be used for slurry concentration requirements of 25-35%, and the output of general-purpose filters has a small attenuation, which is consistent with the optimal concentration range of 45-65 and general-purpose filters.

[0057] 3. Removing the mixing device: In this embodiment, a trapezoidal grooved plate 800 is provided at the bottom of the filtrate tank 100, forming V-shaped channels on both sides of the filter plate; the slotted filter fan 400 is designed as a short filter fan, which is installed around the circumference of the main shaft cylinder 200. Water-blocking flanges 300 are provided at both ends of the inner side of the filtrate tank 100. The lower part of the roller is immersed in the slurry and approaches the high concentration zone of the slurry in the filtrate tank 100. Due to its high solid content, the slurry entering the filtrate tank 100 quickly enters the trapezoidal groove to form a high concentration zone of slurry, creating good basic conditions for removing the mixing device.

[0058] 4. The slotted filter fan 400 is a short filter fan. It quickly draws in sufficient thickness and fills the solid material through the trapezoidal groove in the high concentration zone, improving the efficiency per unit area and avoiding the air leakage problem caused by standard filter fans.

[0059] 5. The main shaft 200 adopts a self-aligning roller bearing to overcome the shortcomings of the bearing bush.

[0060] 6. Eliminating the mixing device avoids the problem of slurry leakage and saves 24,000-90,000 kWh of electricity per year.

[0061] 7. Since this embodiment uses a slotted filter fan, woven filter cloth can replace some existing ceramic filter machines, eliminating the need for cleaning.

[0062] 8. In this embodiment, a channel structure is adopted. The solids need to enter the channel formed by the adjacent groove plate 800, and the slotted filter fan 400 will adsorb them. The clean water is discharged through the overflow port 710. Here, the solids refer to the fine solid particles or fine mud in the slurry.

[0063] Comparative Example: Energy Consumption Comparison Table of ZPG20 Filter and a Low-Water-Storage Disc Filter:

[0064] Compared to power consumption of 2.303 kWh and 1.0666 kWh, the energy saving is 53.68%.

[0065] It is worth noting that all contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of bearing 220, slotted filter fan 400 and distributor 600 are not specifically limited and can be determined using conventional equipment. Electrical control components not mentioned in this technical solution are not shown in the figure because they are existing technologies, and will not be described here.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-water-storage disc filter, characterized in that: A low-water-storage disc filter includes a filtrate tank (100), a main shaft cylinder (200), a water-blocking flange (300), a slotted filter fan (400), a main shaft drive assembly (500), a distribution head (600), an overflow trough (700), and a discharge trough (900). The filtrate tank (100) is a semi-section tank structure, located on the frame of the filter machine; a feeder is provided on one side of the filtrate tank (100) to transport the contained slurry to the slurry inlet side of the filtrate tank (100), and air-water separators are provided at both ends to separate the discharged filtrate into air and water. The main shaft (200) is composed of a rotating shaft and a roller, and is set on the upper part of the filtrate tank (100). Both ends are supported and fixed by rolling. The main shaft drive assembly (500) is located on the side of the filtrate tank (100) near the feeder and is used to connect an external power source to drive the main shaft cylinder (200) to rotate. The slotted filter fans (400) are arranged on the main shaft (200) to form filter discs, and the filter discs are arrayed on the main shaft (200). The distribution head (600) is set at both ends of the main shaft (200). The distribution head (600) has a venting and liquid-conducting pipe (630). The venting and liquid-conducting pipe (630) is built into the rollers of the main shaft (200) and is connected to the slotted filter fan (400) through an array of horizontally arranged pipes for sucking up the filtrate. Water-blocking flanges (300) are provided at both inner ends of the filtrate tank (100) and contact the roller ends of the main shaft cylinder (200) to prevent slurry from entering the overflow side and reduce the amount of slurry stored in the filtrate tank (100); Overflow tanks (700) are located at both outer ends of the filtrate tank (100) for the discharge of clean water from the overflow side of the filtrate tank (100); The discharge trough (900) is located at the rear end of the overflow side of the filtrate tank (100) and is interspersed with the filter disc to collect the filter cake; The ratio of the roller diameter of the main shaft (200) to the length of the slotted filter fan (400) is 5 to 6:

1. Water-blocking flanges (300) are provided at both ends of the filtrate tank (100) to reduce the amount of slurry stored in the filtrate tank (100). The lower part of the roller and the slotted filter fan (400) above it are immersed in the slurry of the filtrate tank (100). The slotted filter fan (400) adsorbs the solids in the slurry and forms a filter cake on the filter plate. The cake is then discharged on the conveyor belt through the discharge chute (900). The clear water in the slurry of the filtrate tank (100) is divided into two parts. First, it is discharged through the filter cake layer and filter cloth of the slotted filter fan (400) into the flow channel inside the slotted filter fan (400) and discharged through the air-water separator. Second, the clear water in the filtrate on the overflow side is discharged through the overflow chute (700).

2. The low-water-storage disc filter according to claim 1, characterized in that: The main shaft (200) is provided with distribution ventilation and liquid supply bushings (210) at both ends, and is supported by bearings (220) rolling. The distribution ventilation and liquid supply bushings (210) are mounted on the rotating shaft of the main shaft (200), and the bearings (220) are self-aligning roller bearings.

3. A low-water-storage disc filter according to claim 2, characterized in that: The dispensing head (600) includes a static ceramic friction ring (610), a dynamic ceramic friction ring (620), and a venting and liquid-conducting pipe (630). A moving ceramic friction ring (620) is provided at the end of the distribution air-fluid bushing (210) and rotates with the main shaft (200); a stationary ceramic friction ring (610) is provided on the outside of the moving ceramic friction ring (620). One end of the stationary ceramic friction ring (610) is connected to the gas-liquid separator, and the other end is connected to the moving ceramic friction ring (620). It can be sucked or blown through the corresponding air port to achieve adsorption or unloading; the air ports on the stationary ceramic friction ring (610) are respectively connected to the air-fluid pipes (630). The air-fluid pipes (630) are built into an array in the roller and are connected to the slotted filter fans (400) on the filter disc through the array of horizontally placed pipes. Each filter disc corresponds to one air-fluid pipe (630). The static ceramic friction ring (610) is provided with an upper water and air discharge port, a lower water and air discharge port and a reverse air port. When the slotted filter fan (400) is immersed in the adsorption zone, the solids are adsorbed onto the surface of the slotted filter fan (400), while the water passes through the filter cloth into the interior of the slotted filter fan (400) and is drawn out of the filter machine by the vacuum pump through the lower water and air discharge port. When the slotted filter fan (400) rotates out of the filtrate tank (100) and enters the drying zone with the main shaft cylinder (200), the vacuum pump through the upper water and air discharge port continues to draw out the material moisture inside the slotted filter fan (400) and on the surface of the slotted filter fan (400) and discharge it out of the filter machine. When the slotted filter fan (400) rotates out of the drying zone with the main shaft cylinder (200), air is injected into the slotted filter fan (400) through the reverse air port and blown down in the opposite direction, and the material falls onto the belt conveyor below the filter machine.

4. A low-water-storage disc filter according to claim 1, characterized in that: The water-blocking flange (300) has a semi-circular arc structure. An inclined baffle (310) is provided radially on the water-blocking flange (300). The baffle (310) is a rubber plate, which is embedded in the end face of the water-blocking flange (300) to contact the roller end of the main shaft cylinder (200) and prevent slurry from entering the overflow side. The baffle (310) is located on the front side of the water-blocking flange (300), and one end of the water-blocking flange (300) is farther away from the axial center line of the main shaft cylinder (200) than the other end. The top of the water-blocking flange (300) on the slurry inlet side has an inclined structure and gradually rises radially along the water-blocking flange (300). The top of the water-blocking flange (300) on the overflow side has a straight structure. The top of the water-blocking flange (300) on the slurry inlet side is higher than the top of the water-blocking flange (300) on the overflow side. A slope plate (110) is provided at the lower part of the water-retaining flange (300) inside the filtrate tank (100).

5. A low-water-storage disc filter according to claim 1, characterized in that: The overflow trough (700) is a funnel structure, which is set at both ends of the filtrate tank (100) and connected by a connecting pipe; the overflow trough (700) is connected to the filtrate tank (100) through the overflow port (710); the overflow port (710) is set on the overflow side of the filtrate tank (100), and the height of the overflow port (710) is lower than the filtrate tank (100), higher than the top of the overflow side water-blocking flange (300) and lower than the top of the slurry inlet side water-blocking flange (300); when the roller of the main shaft cylinder (200) enters the slurry in the overflow trough (700), when it passes through the adsorption zone, the solids in the slurry are adsorbed onto the filter plate to form a filter cake, and the clear water on the overflow side flows through the overflow port (710) to the overflow trough (700) and is discharged.

6. A low-water-storage disc filter according to claim 1, characterized in that: It also includes grooved discs (800), which are arrayed at the bottom of the filtrate tank (100) and intersect with the filter discs formed by the slotted filter fans (400) on the main shaft (200) to form a channel for filter disc adsorption; the grooved discs (800) are circular arc hollow closed structures and are lower than the roller diameter of the main shaft (200); the cross section of the grooved discs (800) is trapezoidal, forming V-shaped grooves on both sides of the filter discs, coordinating the rollers of the main shaft (200) and the water-blocking flange (300) to jointly suppress the slurry concentration in the V-shaped grooves, forming a high concentration of slurry in the V-shaped grooves; a through groove (810) is provided at the bottom of the grooved discs (800) to connect the grooved discs (800) with each other.

7. A low-water-storage disc filter according to claim 1, characterized in that: The slotted filter fan (400) includes a filter fan body, and two filter fan bodies are connected to form an integral disc filter slotted filter fan. The filter fan body includes an outer frame (410), a belly plate (420), a slot (430), an external vent (440), a suction outlet (450), a mounting base (460), a spacer column, an inner frame, and an internal vent. The outer frame (410) is a fan-shaped structure, serving as the outer contour of the filter fan body. It has a large end and a small end, which are used to assemble filter cloth on the filter press to form a filter disc. The web plate (420) is located inside the outer frame (410) on the front side of the filter fan body, forming a support with the outer frame (410); The external vent (440) is obliquely placed on the web (420), arranged in a mirror array with the center line of the filter fan body as the center, and is a blind hole structure; The internal vent is embedded in the external vent (440), forming a through-hole structure, which creates ventilation and dehydration channels on both sides of the filter fan for ventilation and dehydration. The slot (430) is an open slot at the top, located between the outer frame (410) and the external vent (440), and closes the external vent (440) to form an independent unit for mounting filter cloth on the filter fan body; The mounting base (460) is set at both ends of the small end of the outer frame (410) for inserting the filter fan onto the roller of the main shaft (200) to form a filter disc; The suction outlets (450) are arranged inside the mounting base (460) and symmetrically distributed with the center line of the filter fan body as the center, for ventilation and drainage; The inner frame is located on the back of the filter fan body, inside the outer frame (410), forming an independent accommodating cavity; Spacer columns are arranged in the receiving cavity on the back of the web (420) and are arranged alternately with the internal vent holes to support the web (420). Among them, the filter cloth consists of two single pieces corresponding to the outline of the filter fan, and the card slot (430) is provided with a card to embed and fix the filter cloth; The spacers arranged on the back of the web (420) reduce the water storage space inside the filter fan, so that the water storage is reduced when the filter fan enters the drying zone, thus reducing the vacuum load of the filter fan in the drying zone. The suction port (450) is moved from the middle position of the small end of the filter fan to both ends adjacent to the small end of the filter fan. When the filter fan enters the drying zone, the suction port (450) is located at the lower part of the filter fan, which facilitates the rapid discharge of water stored inside the filter fan.

8. A low-water-storage disc filter according to claim 7, characterized in that: The filter cloth of the slotted filter fan (400) is a single piece of woven filter cloth corresponding to the outline of the filter fan. It is fixed by embedding it into the slot with a belt. If the filter cloth on one side is damaged, the whole filter fan does not need to be replaced.

9. A low-water-storage disc filter according to claim 7, characterized in that: The mounting base (460) includes a mounting platform (461) and an insertion slot (462); the insertion slot (462) is a semi-circular arc groove. When two adjacent filter fans are connected, they only need to be inserted together. The two semi-circular arc grooves close to form a bolt assembly mounting slot, which is then locked and fixed by the bolt assembly; a mounting platform (461) is provided on the upper plane of the insertion slot (462) to support the bolt assembly. A positioning groove is provided on the mounting platform (461) for positioning when two slot-type filter fans (400) are connected; when the filter fan is disassembled, the bolt assembly is loosened and the filter fan can be pulled out radially along the main shaft of the filter.

10. A low-water-storage disc filter according to claim 9, characterized in that: It also includes insert supports (470), which are arranged in a circumferential array on the rollers of the main shaft (200) for inserting slotted filter fans (400); the insert supports (470) include a bearing seat (471), a bolt (472), a nut (473) and a retaining ring (474). The bearing seat (471) is a structural plate, arranged circumferentially on the rollers of the main shaft cylinder (200); the lower part of the bearing seat (471) is connected to the rollers of the main shaft cylinder (200), and the upper part is provided with a through hole, through which bolts (472) pass to form a limit for the connection of two slotted filter fans (400); the limit ring (474) is a round washer, fitted on the bolt (472), and the limit ring (474) is provided with a positioning stop that matches the positioning groove on the mounting platform (461) of the slotted filter fan (400). When the nut (473) and bolt (472) are screwed together, rotating the nut (473) pushes the positioning stop of the limit ring (474) into the positioning groove of the two slotted filter fans (400), tightens the nut (473), and connects the two slotted filter fans (400) together; when the nut (473) is loosened and the limit ring (474) is removed, the slotted filter fan (400) can be pulled out radially from the roller of the main shaft cylinder (200) without completely disassembling the nut (473) and bolt (472); Among them, bolt (472) is a bolt for hexagonal head reamed holes.

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