Micro-filter for aquaculture tail water

Abstract

The invention belongs to the technical field of agricultural tail water treatment, and relates to an aquaculture tail water microfilter which comprises a case and a roller, the roller comprises two annular plates, and a plurality of baffles which are uniformly distributed in a circular ring shape are arranged between the two annular plates; the outer end face of each baffle is an arc face, the arc center and the central axis of the annular plate are collinear, the multiple baffles define a cylindrical structure, a cylindrical filter screen is fixedly installed on the outer side of the cylindrical structure, and the outer end face of each baffle makes clearance contact with the inner side wall face of the cylindrical filter screen. A pollution discharge box of which the top end is of an open structure is mounted in the roller, and the pollution discharge box is used for collecting solid substances falling from the inner top of the cylindrical filter screen. When the micro-filter is used for filtering aquaculture tail water, more solid substances are carried to the upper part of the pollution discharge box by utilizing the rotation of the baffle, so that the solid substances retained at the bottom in the cylindrical filter screen can be reduced, the filtering efficiency of the micro-filter is improved, the starting frequency of an automatic backwashing system is reduced, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural tail water treatment, and in particular relates to an aquaculture tail water microfilter. Background Art

[0002] Aquaculture plays an important role in the development of agriculture. In the process of aquaculture, a large amount of bait residue and fish feces are mixed into the water, which will lead to eutrophication of the water in the breeding pond; if the eutrophication of the water in the breeding pond is not treated and the water is not replaced, the water environment in the breeding pond will deteriorate, causing aquatic products to be infected, resulting in reduced quality and output of aquatic products; if the tail water discharged from the breeding pond is directly discharged into natural waters, the natural water environment will be polluted.

[0003] In the aquaculture process, the existing technology uses a circulation method to replace the water in the aquaculture pond and discharge the aquaculture tail water to the outside. The tail water is treated by constructing "three ponds, two dams and one wetland" or "ecological pond", using "fish and rice co-cultivation" or filtering equipment to reduce the pollution caused by aquaculture tail water to the environment. Among them, the tail water treatment method of constructing "three ponds, two dams and one wetland" or "ecological pond" and using "fish and rice co-cultivation" takes a long time and has a slow effect. It is not suitable for large-scale or factory-scale aquaculture tail water treatment. The use of microfiltration machines to filter the residual bait and feces in aquaculture tail water has the advantages of small footprint, good filtering effect, long service life, low energy consumption, and low later maintenance cost.

[0004] The existing tailwater microfilter has an automatic backwashing function. The solid materials such as residual bait, feces and sludge are trapped on the inner wall of the filter. During automatic backwashing, after the filter rotates to the top, the high-pressure nozzle sprays high-pressure water to wash the solid materials attached to the inner wall of the filter, so that the solid materials are flushed into the sewage box and discharged outward. However, not all solid materials will adhere to the inner wall of the filter and rotate to the top with the filter. Some solid materials will always stay at the bottom of the filter during the rotation of the filter, which also causes these solid materials to be unable to be carried to the top by the filter and flushed into the sewage box by high-pressure water. These solid materials block the filtration channel of the filter, resulting in a decrease in the filtration efficiency of the microfilter, a faster rise in the water level inside the microfilter, and an increase in the startup frequency of the automatic backwashing system. Summary of the invention

[0005] The purpose of the present invention is to provide an aquaculture tail water microfilter, which arranges a plurality of baffles on the inner wall of a cylindrical filter screen, and uses the rotation of the baffles to carry the solid matter at the bottom of the cylindrical filter screen that is not attached to the inner wall of the cylindrical filter screen to the top of the cylindrical filter screen, so that more solid matter can be flushed into the sewage box by the high-pressure water sprayed by the automatic backwashing system, thereby reducing the solid matter retained at the bottom of the cylindrical filter screen, improving the filtering efficiency of the microfilter, reducing the starting frequency of the automatic backwashing system, and saving energy consumption.

[0006] The present invention is achieved through the following technical solutions:

[0007] An aquaculture tailwater microfilter comprises a chassis and a drum rotatably mounted inside the chassis, wherein the drum comprises two annular plates, a plurality of baffles are arranged between the two annular plates, both ends of each baffle are respectively connected to the two annular plates, and the plurality of baffles are evenly distributed in a circular ring shape with the central axis of the annular plate as the center;

[0008] The outer end surface of each baffle is an arc surface, and the arc center of the outer end surface of each baffle is collinear with the central axis of the annular plate. Multiple baffles are combined to form a cylindrical structure. A cylindrical filter screen is fixedly installed on the outer side of the cylindrical structure. The outer end surface of each baffle is in gap contact with the inner wall surface of the cylindrical filter screen.

[0009] A sewage box with an open top is installed inside the drum, and the sewage box is used to collect solid matter falling from the top of the cylindrical filter screen;

[0010] When the microfilter filters aquaculture tail water, the drum rotates and the cylindrical filter screen rotates with the drum. Solid substances such as residual bait, feces and sludge in the tail water are trapped inside the cylindrical filter screen. A part of the solid substances adhere to the inner wall of the cylindrical filter screen and rotate with the cylindrical filter screen to the top of the sewage discharge box. This part of the solid substances can be washed into the sewage discharge box by high-pressure water. When the baffle of the drum rotates, the solid substances at the bottom of the cylindrical filter screen that are not attached to the inner wall of the cylindrical filter screen are carried to the top of the sewage discharge box. As the baffle continues to rotate and under the flushing of high-pressure water, the solid substances entrained between the inner surface of the baffle and the inner wall of the cylindrical filter screen fall downward at the top of the cylindrical filter screen into the sewage discharge box, so that more solid substances trapped in the cylindrical filter screen can be washed into the sewage discharge box by high-pressure water, reducing the solid substances retained at the bottom of the cylindrical filter screen, improving the filtering efficiency of the microfilter, reducing the startup frequency of the automatic backwashing system, and saving energy consumption.

[0011] Furthermore, annular end covers are provided at both left and right ends of the drum, and the outer edges of the annular end covers are detachably connected to the outer edges of the annular plates by multiple bolts, and the two annular end covers close the left and right ends of the drum; a water inlet pipe is installed at the center of the left annular end cover, and the water inlet pipe and the annular end cover are rotatably connected by a sealing bearing, and the right end of the water inlet pipe extends into the interior of the drum, and aquaculture tail water can be transported into the drum through the water inlet pipe; a sewage pipe is installed at the center of the right annular end cover, and the sewage pipe and the annular end cover are rotatably connected by a sealing bearing, and the left end of the sewage pipe is connected to the sewage box inside the drum, and the interior of the sewage pipe is connected to the bottom of the sewage box, so that the high-pressure water and solid matter collected in the sewage box can be discharged outward through the sewage pipe.

[0012] Furthermore, an annular external gear disk is fixedly mounted on the outer side wall of at least one of the annular end covers, a transmission shaft is rotatably mounted on the inner side wall of the chassis, a driving gear is mounted on one end of the transmission shaft, the driving gear is meshed with the annular external gear disk, and a motor for driving the transmission shaft to rotate is mounted on the outer side wall of the chassis, and the drum can be driven to rotate by the motor.

[0013] Furthermore, the outer side walls of the two annular end covers are fixedly mounted with annular external toothed discs, and the inner bottom of the chassis is mounted with two support seats spaced apart on the left and right sides, and each support seat is rotatably mounted with an auxiliary gear, one of the auxiliary gears is meshed with one of the annular external toothed discs, and the other auxiliary gear is meshed with the other annular external toothed disc; the two auxiliary gears can support the roller and assist the rotation of the roller.

[0014] Furthermore, the chord angle α between the inner surface of the baffle and the cylindrical filter is 45° to 90°; the smaller the chord angle α, the closer the inner surface of the baffle is to the inner wall of the cylindrical filter. If the chord angle α is too small, the solid matter entrained between the inner surface of the baffle and the inner wall of the cylindrical filter will not be easily washed away by water or fall off at the top of the cylindrical filter. If the chord angle α is too large, the solid matter entrained between the inner surface of the baffle and the inner wall of the cylindrical filter will fall off before reaching the top of the cylindrical filter and will not easily fall into the sewage box.

[0015] Furthermore, the cylindrical filter is composed of two flexible plate-shaped filter screens; connecting rings are provided between the left end of the baffle and the left annular plate and between the right end of the baffle and the right annular plate, one end of the connecting ring is fixed to the inner wall of the annular plate, and the other end of the connecting ring is fixedly connected to the end of each baffle; the inner wall of the left end and the inner wall of the right end of the plate-shaped filter are respectively fixed to the outer walls of the two connecting rings, and each baffle can support the plate-shaped filter screen.

[0016] Furthermore, two arc-shaped connecting plates are arranged between the two connecting rings, and the two arc-shaped connecting plates are symmetrical along the central axis of the connecting rings; the connecting ends between the two plate-shaped filter screens are respectively fixed on the two arc-shaped connecting plates, which can improve the stability of the plate-shaped filter screens.

[0017] Furthermore, the front side plate and the rear side plate of the sewage box are both inclined, and the distance between the top of the front side plate and the top of the rear side plate is greater than the distance between the bottom of the front side plate and the bottom of the rear side plate, so that the top opening of the sewage box is larger and the bottom end is narrower, thereby reducing the space occupied by the sewage box in the drum, allowing more solid matter on the top of the cylindrical filter to be washed into the sewage box, and diverting the solid matter and water to gather at a lower place in the sewage box.

[0018] Furthermore, the bottom plate of the sewage box is inclined with the left side higher and the right side lower, and the bottom of the right side plate of the sewage box is connected to the sewage pipe, and the interior of the sewage pipe is connected to the inner bottom of the right end of the sewage box; in the sewage box with the above structure, solid matter and high-pressure water can gather at the inner bottom of the right end of the sewage box after falling into the sewage box, and be discharged outward through the sewage pipe.

[0019] Furthermore, a bracket is provided between the left end of the sewage box and the right end of the water inlet pipe, and the bracket can improve the stability of the sewage box.

[0020] Furthermore, the bracket is composed of a T-shaped connecting plate fixed to the outer wall of the left end of the sewage box and an arc-shaped support plate fixed to the bottom of the T-shaped connecting plate. The inner wall of the arc-shaped support plate is in contact with the outer wall of the water inlet pipe, thereby using the water inlet pipe to provide support for the sewage box.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] When the microfilter filters aquaculture tail water, the drum rotates, and the cylindrical filter rotates with the drum. Solid substances such as residual bait, feces and sludge in the tail water are trapped inside the cylindrical filter. Some solid substances adhere to the inner wall of the cylindrical filter and rotate with the cylindrical filter to the top of the sewage box. This part of the solid substances can be washed into the sewage box by the high-pressure water sprayed by the automatic backwashing system. When the baffle of the drum rotates, the solid substances at the bottom of the cylindrical filter that are not attached to the inner wall of the cylindrical filter are carried to the sewage box. The solid matter trapped between the inner surface of the baffle and the inner wall of the cylindrical filter screen falls downward into the sewage box at the top of the cylindrical filter screen as the baffle continues to rotate and is flushed by the high-pressure water sprayed by the automatic backwashing system, so that more solid matter trapped in the cylindrical filter screen can be flushed into the sewage box by the high-pressure water, which can reduce the solid matter retained at the bottom of the cylindrical filter screen, improve the filtration efficiency of the microfilter, reduce the start-up frequency of the automatic backwashing system of the microfilter, and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the drum in the present invention.

[0024] Figure 2 It is a schematic diagram of the explosion structure of the drum in the present invention.

[0025] Figure 3 It is a schematic diagram of the top view of the structure of the drum in the present invention.

[0026] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction.

[0027] Figure 5 for Figure 4 Enlarged schematic diagram of the local structure at point C in the middle.

[0028] Figure 6 for Figure 3 Schematic diagram of the cross-sectional structure along the BB direction.

[0029] Figure 7 It is a schematic diagram of the three-dimensional structure of the sewage discharge box in the present invention.

[0030] Figure 8 It is a schematic diagram of the cross-sectional structure of the present invention along the axial direction of the drum.

[0031] Fig. 9 It is a schematic diagram of the cross-sectional structure of the present invention along the radial direction of the drum.

[0032] The names of the components in the figure are: 1. Drum 1.1, annular plate 1.2, baffle 1.3, connecting ring 1.4, arc-shaped connecting plate 2, cylindrical filter 2.1, plate filter 3, auxiliary gear 4, annular end cover 5, water inlet pipe 6, annular outer gear plate 7, transmission shaft 8, driving gear 9, bracket 9.1, T-type connecting plate 9.2, arc-shaped support plate 10, sewage box 11, sewage pipe 12, chassis 13, motor 14, automatic backwashing system 14.1, water pump 14.2, water suction pipe 14.3, water supply main pipe 14.4, spray branch pipe 14.5, nozzle 15, support seat 16, drain pipe. DETAILED DESCRIPTION

[0033] The present invention is further described below through specific embodiments in conjunction with the accompanying drawings, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0034] A microfiltration machine for aquaculture tail water, such as Figure 8 As shown, it includes a chassis 12, a drum 1 rotatably installed inside the chassis 12, a cylindrical filter screen 2 installed on the outer wall of the drum 1, a motor 13 for driving the drum 1 to rotate, and an automatic backwashing system 14 for backwashing the cylindrical filter screen 2.

[0035] like Figures 1 to 6 As shown, the drum 1 is composed of two annular plates 1.1, a plurality of baffles 1.2, two connecting rings 1.3 and two arc-shaped connecting plates 1.4; the two connecting rings 1.3 are respectively fixed to the inner side walls of the two annular plates 1.1, and the annular plates 1.1 and the connecting rings 1.3 are coaxial and can be welded or integrally formed; the plurality of baffles 1.2 are all located between the two connecting rings 1.3, and the left and right ends of each baffle 1.2 are respectively fixedly connected to the two connecting rings 1.3, and can be welded or integrally formed, and the plurality of baffles 1.2 are evenly distributed in a circular ring shape with the central axis of the annular plate 1.1 as the center;

[0036] like Figure 4As shown, the outer end surface of each baffle 1.2 is an arc surface, and the arc center of the outer end surface of each baffle 1.2 is collinear with the central axis of the annular plate 1.1, and multiple baffles 1.2 are surrounded to form a cylindrical structure;

[0037] like Figures 4 to 6 As shown, the left and right ends of the two arc-shaped connecting plates 1.4 are respectively fixedly connected to the two connecting rings 1.3, and can be welded or integrally formed. The two arc-shaped connecting plates 1.4 are symmetrical along the central axis of the connecting ring 1.3, and the arc centers of the two arc-shaped connecting plates 1.4 are collinear with the central axis of the annular plate 1.1.

[0038] like Figures 2 to 4 As shown, the cylindrical filter screen 2 is composed of two bendable plate-shaped filter screens 2.1, and the two plate-shaped filter screens 2.1 are both wrapped and installed on the outside of the two connecting rings 1.3 to form a cylindrical shape; the inner wall of the left end and the inner wall of the right end of the plate-shaped filter screen 2.1 are respectively fixed to the outer walls of the two connecting rings 1.3; the two connecting ends between the two plate-shaped filter screens 2.1 are respectively attached to the outer arc surfaces of the two arc-shaped connecting plates 1.4; specifically, the plate-shaped filter screen 2.1 and the connecting ring 1.3 and the plate-shaped filter screen 2.1 and the arc-shaped connecting plate 1.4 can be detachably connected by multiple screws or fixed by a pipe hoop, which can facilitate the replacement of the plate-shaped filter screen 2.1; the connecting end between the two plate-shaped filter screens 2.1 refers to the adjacent ends of the two plate-shaped filter screens 2.1 when they are enclosed into a cylindrical shape;

[0039] like Figures 2 to 6 As shown, each baffle 1.2 is located inside the cylindrical filter 2, and the outer end surface of each baffle 1.2 is in contact with the inner wall gap of the plate filter 2.1 of the cylindrical filter 2. Each baffle 1.2 can support the plate filter 2.1, so that the two plate filter 2.1 can be enclosed into a cylindrical shape; Figure 4 and Figure 5 As shown, the size of the tangent angle α between the inner surface of the baffle 1.2 and the cylindrical filter screen 2 is 45° to 90°; the smaller the tangent angle α, the closer the inner surface of the baffle 1.2 is to the inner wall of the cylindrical filter screen 2. If the tangent angle α is too small, the solid matter entrained between the inner surface of the baffle 1.2 and the inner wall of the cylindrical filter screen 2 is not easily washed by water and is not easy to fall off at the top of the cylindrical filter screen 2. If the tangent angle α is too large, the solid matter entrained between the inner surface of the baffle 1.2 and the inner wall of the cylindrical filter screen 2 has not reached the top of the cylindrical filter screen 2. It has already slipped off the baffle 1.2 and is not easy to fall into the sewage box 10. It is explained here that Figure 4 In the embodiment, the rotation direction of the drum 1 is counterclockwise.

[0040] like Figure 2 , Figure 4 , Figures 6 to 9As shown, a sewage box 10 with an open top is installed inside the drum 1 , and the sewage box 10 is used to collect solid matter dropped from the top of the cylindrical filter screen 2 .

[0041] like Figures 1 to 4 , Figure 6 As shown, both left and right ends of the drum 1 are provided with an annular end cover 4, and the outer edge of the annular end cover 4 is detachably connected to the outer edge of the annular plate 1.1 by a plurality of bolts, and the two annular end covers 4 close the left and right ends of the drum 1;

[0042] like Figures 1 to 3 , Figure 6 , Figure 8 As shown, a water inlet pipe 5 is installed in the center of the left annular end cover 4, and the water inlet pipe 5 and the annular end cover 4 are rotatably connected through a sealed bearing, the right end of the water inlet pipe 5 extends into the drum 1, and the left end of the water inlet pipe 5 passes through the chassis 12 and is sealed and fixed to the chassis 12, and aquaculture tail water can be transported into the drum 1 through the water inlet pipe 5;

[0043] like Figures 2 to 4 , Figure 6 , Figure 8 As shown, a drain pipe 11 is installed in the center of the right annular end cover 4, and the drain pipe 11 is rotatably connected to the annular end cover 4 through a sealed bearing. The left end of the drain pipe 11 is connected to the drain box 10 inside the drum 1, and the inside of the drain pipe 11 is connected to the bottom of the drain box 10. The right end of the drain pipe 11 passes through the chassis 12 and is sealed and fixed to the chassis 12, so that the high-pressure water and solid matter collected in the drain box 10 can be discharged outward through the drain pipe 11.

[0044] like Figure 1 , Figure 2 and Figure 8 As shown, an annular outer toothed disc 6 is fixedly mounted on the outer side walls of the two annular end covers 4, and two support seats 15 spaced apart from each other are mounted on the inner bottom of the chassis 12. An auxiliary gear 3 is rotatably mounted on each support seat 15, one of the auxiliary gears 3 is meshed with one of the annular outer toothed discs 6, and the other auxiliary gear 3 is meshed with the other annular outer toothed disc 6; the two auxiliary gears 3 can support the drum 1 and can assist the drum 1 in rotating;

[0045] like Figure 8 As shown, a transmission shaft 7 is rotatably mounted on the inner side wall of the chassis 12, a driving gear 8 is mounted on one end of the transmission shaft 7, the driving gear 8 is meshed with one of the annular outer gear plates 6, a motor 13 is mounted on the outer side wall of the chassis 12, and the other end of the transmission shaft 7 is transmission-connected with the power output end of the motor 13; specifically, the transmission shaft 7 is rotatably mounted on the side wall of the chassis 12 through a bearing, and the motor 13 is equipped with a reduction box, and the motor 13 can drive the drum 1 to rotate;

[0046] It is explained here that the above-mentioned rotation driving structure of the drum 1 is one of the prior arts, and there are other forms of rotation driving structures in the existing microfiltration machines, which can all be applied to the present application.

[0047] like Figure 8 As shown, the automatic backwashing system 14 is composed of a water pump 14.1, a water suction pipe 14.2, a water supply main pipe 14.3, a spray branch pipe 14.4 and a nozzle 14.5; the water pump 14.1 is fixed to the outer wall of the chassis 12, one end of the water suction pipe 14.2 is connected to the bottom of the chassis 12, and the other end of the water suction pipe 14.2 is connected to the water inlet of the water pump 14.1; one end of the water supply main pipe 14.3 is connected to the water outlet of the water pump 14.1, and the other end thereof is fixed inside the chassis 12, and a plurality of spray branches 14.4 are arranged at intervals along the axial direction of the cylindrical filter 2 on the top of the cylindrical filter 2, and the top of each spray branch pipe 14.4 is The bottom end of the spray branch pipe 14.4 is fixed and connected with the water supply main pipe 14.3, and a nozzle 14.5 is installed. During automatic backwashing, the water pump 14.1 draws water from the chassis 12 and pressurizes it to transport it to each spray branch pipe 14.4, and each nozzle 14.5 sprays water to wash the cylindrical filter 2, flushing the solid matter attached to the inner wall of the top of the cylindrical filter 2 into the sewage box 10, and flushing the solid matter on the baffle 1.2 at the top of the cylindrical filter 2 into the sewage box 10. In addition to drawing backwashing water in the chassis 12, the water pump 14.1 can also draw water from other water sources. The automatic backwashing system 14 is a well-known technology for microfiltration machines.

[0048] In addition, the microfilter also includes a PLC controller installed on the outer wall of the chassis 12, a liquid level sensor installed in the chassis 12 for monitoring the water level in the chassis 12, and a liquid level sensor installed on the bypass pipe of the water inlet pipe 5 for monitoring the water level in the drum 1. Each liquid level sensor, the motor 13, and the water pump 14.1 are electrically connected to the PLC controller; the water level in the drum 1 is monitored by the liquid level sensor, and the signal is transmitted to the PLC controller. If the water level in the drum 1 reaches a preset water level, it indicates that the cylindrical filter screen 2 is blocked. At this time, the water pump 14.1 is controlled to start and backwash the cylindrical filter screen 2. At the same time, the drum 1 is controlled to rotate so that the baffle 1.2 carries the solid matter at the bottom of the cylindrical filter screen 2 to the top, so that the solid matter can fall into the sewage box 10; the above-mentioned control system, water level monitoring system and automatic backwashing system 14 of the microfilter are all existing technologies and are used in existing microfilters, so they will not be repeated here.

[0049] As a preferred implementation, in this embodiment, Figure 4 and Figure 7 As shown, the front side plate and the rear side plate of the sewage box 10 are both inclined, and the distance between the top of the front side plate and the top of the rear side plate is greater than the distance between the bottom of the front side plate and the bottom of the rear side plate;

[0050] like Figure 6 and Figure 7 As shown, the bottom plate of the sewage box 10 is inclined with the left side higher and the right side lower. The bottom of the right side plate of the sewage box 10 is connected to the sewage pipe 11, and the interior of the sewage pipe 11 is connected to the bottom of the right end of the sewage box 10;

[0051] The sewage box 10 of the above structure has a larger opening at the top and a narrower bottom, thereby reducing the space occupied by the sewage box 10 in the drum 1, so that more solid matter at the top of the cylindrical filter screen 2 can be washed by high-pressure water and fall into the sewage box 10. After the solid matter and the high-pressure water fall into the sewage box 10, they can gather at the bottom of the right end of the sewage box 10 and be discharged outward through the sewage pipe 11.

[0052] As a preferred implementation, in this embodiment, Figure 2 , Figure 6 and Figure 7 As shown, a bracket 9 is provided between the left end of the sewage box 10 and the right end of the water inlet pipe 5, and the right end of the sewage box 10 is supported by the sewage pipe 11. The bracket 9 is used to support the left end of the sewage box 10, which can improve the stability of the sewage box 10;

[0053] Specifically, Figure 2 and Figure 7 As shown, the bracket 9 is composed of a T-shaped connecting plate 9.1 fixed to the outer wall of the left end of the sewage box 10 and an arc-shaped support plate 9.2 fixed to the bottom of the T-shaped connecting plate 9.1. The inner wall of the arc-shaped support plate 9.2 is in contact with the outer wall of the water inlet pipe 5, so that the water inlet pipe 5 provides support for the sewage box 10.

[0054] As a preferred implementation, in this embodiment, Figure 8 and Fig. 9 As shown, a drain pipe 16 is installed on the bottom side wall of the chassis 12, and the tail water filtered by the cylindrical filter screen 2 is discharged outside through the drain pipe 16 in the chassis 12.

[0055] In this embodiment, the working principle of the microfilter is:

[0056] When the microfilter filters aquaculture tail water, the tail water is transported to the inside of the drum 1 by the water inlet pipe 5, and the cylindrical filter screen 2 filters the tail water in the drum 1. Solid substances such as residual bait, feces and sludge in the tail water are trapped in the cylindrical filter screen 2. Some solid substances can adhere to the inner side wall of the cylindrical filter screen 2, and other solid substances are free at the bottom of the cylindrical filter screen 2. After the tail water is filtered by the cylindrical filter screen 2, it is discharged to the outside through the drain pipe 16 in the machine box 12, and can be discharged to natural waters or recycled.

[0057] When the liquid level sensor detects that the liquid level in the drum 1 reaches a preset high level, it indicates that the cylindrical filter screen 2 is clogged, which affects the filtering effect of the cylindrical filter screen 2 and requires backwashing of the cylindrical filter screen 2;

[0058] During backwashing, the water pump 14.1 draws water from the housing 12 and pumps high-pressure water to each spray branch pipe 14.4, and each nozzle 14.5 sprays water to the top of the cylindrical filter screen 2. At the same time, the motor 13 drives the drum 1 to rotate, and the cylindrical filter screen 2 rotates with the drum 1; when the cylindrical filter screen 2 with solid matter attached rotates to the top, the high-pressure water sprayed by the nozzle 14.5 backwashes the cylindrical filter screen 2, and the solid matter attached to the inner wall of the cylindrical filter screen 2 is flushed into the sewage box 10, and the baffle 1.2 of the drum 1 rotates to carry the solid matter that is not attached to the inner wall of the cylindrical filter screen 2 at the bottom of the cylindrical filter screen 2 to the sewage box 10 As the baffle 1.2 continues to rotate and under the flushing of high-pressure water, the solid matter entrained between the inner surface of the baffle 1.2 and the inner wall of the cylindrical filter screen 2 falls downward at the top of the cylindrical filter screen 2 into the sewage box 10, so that more solid matter trapped in the cylindrical filter screen 2 can be carried to the top of the cylindrical filter screen 2 and flushed into the sewage box 10 by high-pressure water. The solid matter and water in the sewage box 10 are discharged outward through the sewage pipe 11 and subjected to subsequent treatment, which can reduce the solid matter retained at the bottom of the cylindrical filter screen 2, improve the filtration efficiency of the microfilter, reduce the startup frequency of the automatic backwashing system 14, and save energy consumption.

Claims

1. An aquaculture tailwater microfiltration machine, comprising a housing (12) and a drum (1) rotatably mounted inside the housing (12), characterized in that: The drum (1) comprises two annular plates (1.1), and a plurality of baffles (1.2) evenly distributed in an annular shape are arranged between the two annular plates (1.1); The outer end surface of each baffle (1.2) is an arc surface, and the arc center of the outer end surface of each baffle (1.2) is colinear with the central axis of the annular plate (1.1); a plurality of baffles (1.2) are combined to form a cylindrical structure, a cylindrical filter screen (2) is fixedly installed on the outer side of the cylindrical structure, and the outer end surface of each baffle (1.2) is in gap contact with the inner wall surface of the cylindrical filter screen (2); A sewage box (10) with an open top is installed inside the drum (1), and the sewage box (10) is used to collect solid matter dropped from the top of the cylindrical filter screen (2).

2. The aquaculture tailwater microfilter according to claim 1, characterized in that: The left and right ends of the drum (1) are both provided with an annular end cover (4), and the outer edge of the annular end cover (4) is detachably connected to the outer edge of the annular plate (1.1) via a plurality of bolts; A water inlet pipe (5) is installed in the center of the left annular end cover (4), and the water inlet pipe (5) and the annular end cover (4) are rotatably connected via a sealing bearing, and the right end of the water inlet pipe (5) extends into the interior of the drum (1); A sewage discharge pipe (11) is installed in the center of the right annular end cover (4), and the sewage discharge pipe (11) and the annular end cover (4) are rotatably connected via a sealing bearing. The left end of the sewage discharge pipe (11) is connected to the sewage discharge box (10) inside the drum (1), and the inside of the sewage discharge pipe (11) is connected to the bottom of the sewage discharge box (10).

3. The aquaculture tailwater microfilter according to claim 2, characterized in that: An annular outer toothed disc (6) is fixedly mounted on the outer side wall of at least one of the annular end covers (4); a transmission shaft (7) is rotatably mounted on the inner side wall of the chassis (12); a driving gear (8) is mounted on one end of the transmission shaft (7); the driving gear (8) is meshed with the annular outer toothed disc (6); and a motor (13) for driving the transmission shaft (7) to rotate is mounted on the outer side wall of the chassis (12).

4. The aquaculture tailwater microfilter according to claim 3, characterized in that: An annular outer toothed disc (6) is fixedly mounted on the outer side walls of the two annular end covers (4), and two support seats (15) spaced apart from each other are mounted on the inner bottom of the chassis (12). An auxiliary gear (3) is rotatably mounted on each support seat (15), and the two auxiliary gears (3) are respectively meshed with the two annular outer toothed discs (6).

5. The aquaculture tailwater microfilter according to claim 1, characterized in that: The tangent angle α between the inner surface of the baffle (1.2) and the cylindrical filter screen (2) is in the range of 45° to 90°.

6. The aquaculture tail water microfilter according to claim 1 or 5, characterized in that: The cylindrical filter screen (2) is composed of two bendable plate-shaped filter screens (2.1); a connecting ring (1.3) is provided between the left end of the baffle (1.2) and the left annular plate (1.1) and between the right end of the baffle (1.2) and the right annular plate (1.1); one end of the connecting ring (1.3) is fixed to the inner wall of the annular plate (1.1), and the other end of the connecting ring (1.3) is fixedly connected to the end of each baffle (1.2); the inner wall of the left end and the inner wall of the right end of the plate-shaped filter screen (2.1) are respectively fixed to the outer walls of the two connecting rings (1.3).

7. The aquaculture tailwater microfilter according to claim 6, characterized in that: Two arc-shaped connecting plates (1.4) are arranged between the two connecting rings (1.3), and the two arc-shaped connecting plates (1.4) are symmetrical along the central axis of the connecting ring (1.3); the connecting ends between the two plate-shaped filter screens (2.1) are respectively fixed on the two arc-shaped connecting plates (1.4).

8. The aquaculture tailwater microfilter according to claim 2, characterized in that: The front side plate and the rear side plate of the sewage discharge box (10) are both inclined, and the distance between the top of the front side plate and the top of the rear side plate is greater than the distance between the bottom of the front side plate and the bottom of the rear side plate.

9. The aquaculture tailwater microfilter according to claim 8, characterized in that: The bottom plate of the sewage box (10) is inclined with the left side higher and the right side lower. The bottom of the right side plate of the sewage box (10) is connected to the sewage pipe (11), and the interior of the sewage pipe (11) is communicated with the inner bottom of the right end of the sewage box (10).

10. The aquaculture tail water microfilter according to claim 8 or 9, characterized in that: A bracket (9) for supporting the sewage discharge box (10) is provided between the left end of the sewage discharge box (10) and the right end of the water inlet pipe (5).

11. The aquaculture tailwater microfilter according to claim 10, characterized in that: The bracket (9) is composed of a T-shaped connecting plate (9.1) fixed to the outer side wall of the left end of the sewage box (10) and an arc-shaped supporting plate (9.2) fixed to the bottom of the T-shaped connecting plate (9.1), and the inner side wall of the arc-shaped supporting plate (9.2) is in contact with the outer side wall of the water inlet pipe (5).

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