Cross-flow microalgae harvesting equipment

Abstract

The present invention discloses a cross-flow microalgae harvesting device, comprising a shell, a ceramic flat membrane assembly for concentrating microalgae liquid, and a control assembly for making the microalgae liquid in the shell flow, wherein the ceramic flat membrane assembly is composed of a plurality of groups of ceramic flat membranes arranged in parallel at equal intervals, and the clamping plates at the upper ends of the plurality of groups of ceramic flat membranes are connected with a buoyancy plate for lifting the ceramic flat membrane assembly to suspend by buoyancy, and the bottom of the shell is provided with a trough for accommodating the ceramic flat membrane assembly and enabling it to rise and fall, and the side walls on both sides of the trough are correspondingly provided with a plurality of groups of lifting guide grooves for sliding connection with each clamping plate, and the side walls of the shell are provided with a water pump for pumping the ceramic flat membrane assembly. The present invention can effectively reduce the risk of clogging of the ceramic flat membrane by making the microalgae liquid in the shell flow and making each ceramic flat membrane arranged vertically at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of microalgae collection, and in particular to a cross-flow type microalgae collection device. Background Art

[0002] While aquaculture creates economic benefits, it also produces a large amount of aquaculture wastewater. How to treat wastewater and reduce environmental pressure has become a major problem in aquaculture. Microalgae cultivation can effectively utilize the phosphorus and nitrogen in aquaculture wastewater. Among them, microalgae cultivation can be divided into closed cultivation and open cultivation. The former includes various container and pipeline closed cultivation methods, and the latter includes open non-circulating cultivation, open circulating cultivation and semi-open circulating cultivation.

[0003] While purifying aquaculture wastewater through microalgae cultivation, the resulting microalgae liquid can also be concentrated and used to make algae powder, etc., thereby turning aquaculture wastewater into treasure, protecting the environment while effectively utilizing resources.

[0004] At present, when microalgae liquid is made into algae powder and other products, it is usually necessary to concentrate it to reduce drying time, energy consumption, etc. However, when the microalgae liquid is concentrated in the prior art, membrane clogging problems usually occur, which not only easily affects the efficiency of the microalgae liquid concentration treatment, but also easily causes the concentration treatment equipment to malfunction due to microalgae clogging; therefore, a new type of microalgae harvesting equipment is needed to concentrate the microalgae liquid. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a cross-flow microalgae harvesting device.

[0006] The technical solution of the present invention is: a cross-flow microalgae harvesting device, comprising a shell, a ceramic flat membrane component for concentrating microalgae liquid, and a control component for making the microalgae liquid flow in the shell.

[0007] The ceramic flat membrane assembly is composed of multiple groups of ceramic flat membranes arranged in parallel at equal intervals, and the multiple groups of ceramic flat membranes are clamped and fixed by multiple groups of clamping plates provided at the upper and lower ends, the clamping plates at the upper ends of the multiple groups of ceramic flat membranes are connected to buoyancy plates for lifting the ceramic flat membrane assembly to suspend by utilizing buoyancy, and the water outlets of the multiple groups of ceramic flat membranes are connected to the collecting pipes.

[0008] A trough is provided at the bottom of the shell for accommodating the ceramic flat membrane assembly and enabling it to be lifted up and down. Multiple sets of lifting guide grooves are correspondingly provided on the side walls on both sides of the trough for sliding connection with each clamping plate. A water pump for pumping the ceramic flat membrane assembly is provided on the side wall of the shell. The water pump is connected to the collecting pipe through a hose.

[0009] Furthermore, the buoyancy plate is connected to the clamping plate through a steel rope, thereby ensuring that the buoyancy plate and the ceramic flat membrane assembly have a certain travel margin for docking, thereby improving the stability of the buoyancy plate, and the steel rope has a telescopic margin that allows the ceramic flat membrane assembly to slide up and down along the lifting guide groove, thereby avoiding the steel rope limiting the sliding displacement of the ceramic flat membrane assembly.

[0010] As an optional solution of the present invention, the control component is a reflux pipe and a liquid pump, one end of the reflux pipe is connected to the water outlet provided on the side wall of the shell, and the other end of the reflux pipe is connected to the water inlet provided on the side wall of the shell through the liquid pump. The control component has a simple structure and can effectively meet the unidirectional circulation flow of the microalgae liquid in the shell.

[0011] As another optional scheme of the present invention, the control component is a supporting shaft and two groups of lifting parts that alternately lift and lower to make the shell swing left and right, the supporting shaft is located directly below the shell and is rotatably connected to the bottom of the shell, the two groups of lifting parts are respectively located directly below the shell on the left and right sides of the supporting shaft, and the lifting parts are rotatably connected to the shell through the rotating shaft, and a group of flow limiting plates are respectively inserted in the shell on the left and right sides of the ceramic flat membrane assembly, and a strip hole is respectively provided at the corresponding gap between the flow limiting plate and each ceramic flat membrane of the ceramic flat membrane assembly. The control component can make the microalgae liquid in the shell circulate back and forth left and right, and relative to the setting method of the reflux pipe and the liquid pump, it can effectively reduce the footprint of the device.

[0012] Furthermore, the two groups of lifting parts are hydraulic rods, which are connected to the controller through relays. The setting of the hydraulic rods can meet the driving effect of the shell to swing left and right, thereby realizing the left and right reciprocating circulation of the microalgae liquid in the shell.

[0013] Furthermore, the two groups of lifting parts are spring rods and hydraulic control rods respectively.

[0014] The spring rod comprises a spring rod tube and a spring rod main body, the spring rod main body is slidably connected to the spring rod tube, and a limiting ring is provided at the bottom end of the spring rod main body, and the bottom surface of the spring rod main body is connected to the inner bottom surface of the spring rod tube through a spring;

[0015] The hydraulic control rod comprises a hydraulic control rod tube body and a hydraulic control rod main body. A piston cavity for the hydraulic control rod main body to slide up and down is provided in the middle and upper part of the hydraulic control rod tube body. A liquid injection cavity for injecting liquid into the piston cavity is provided in the lower part of the hydraulic control rod tube body. A plugging piece that can be rotatably opened and closed is provided at the opening of the hydraulic control rod main body. A piston ring for limiting and sealing is provided at the bottom of the hydraulic control rod main body.

[0016] The upper side wall of the hydraulic control rod body is provided with a drain port for releasing the pressure in the hydraulic control rod, a clamping block for clamping the clamping block is provided above the blocking piece, the clamping block is rotatably embedded in the inner wall of the hydraulic control rod body through a torsion spring, and the clamping end of the clamping block is located in the hydraulic control rod body and clamped in the second clamping groove of the blocking piece, the triggering end of the clamping block extends out of the side wall of the hydraulic control rod body, a convex block for pressing down the triggering end is provided on the top of the hydraulic control rod tube body, and a groove is provided at the position of the piston ring corresponding to the position of the convex block.

[0017] A top block for restoring the plugging piece is provided at the bottom of the piston cavity of the hydraulic control rod tube body, and a plurality of through holes communicating with the injection cavity are provided at equal angles at the bottom of the piston cavity around the top block. A magnetic plate for assisting in triggering the plugging piece to open is provided at the opening of the hydraulic control rod body, and a magnetic plate that repel the magnetic force of the magnetic plate is embedded at the position corresponding to the position of the plugging piece and the magnetic plate;

[0018] The spring rod and the hydraulic control rod cooperate with each other to realize the reciprocating lifting and lowering operation of the hydraulic control rod by utilizing the force of the water pump to pump out water. At the same time, the spring rod assists in driving the hydraulic control rod to meet the driving effect of the shell to swing left and right, thereby realizing the left and right reciprocating circulation of the microalgae liquid in the shell.

[0019] Furthermore, a relay water tank is provided on the front side of the water pump for compensating the injection of liquid for the hydraulic control rod. The relay water tank is connected to the water pump through a first inlet and a pipeline, and is connected to a pump in an external water replenishment area through a second inlet and a pipeline. The relay water tank is connected to a liquid inlet at the bottom of the hydraulic control rod through an outlet and a pipeline. Through the setting of the relay water tank, filtered sewage can be injected through the second inlet, and the water flow power of the filtered sewage transported by other water treatment can be utilized, thereby compensating for the driving effect of the hydraulic control rod and achieving energy-saving effect.

[0020] Furthermore, a group of first slots are respectively provided at the left and right ends of the buoyancy plate and at the positions corresponding to the gaps between the ceramic flat membranes of the ceramic flat membrane assembly, and a double-row impeller that is rotated by water flow is rotatably provided in the first slots.

[0021] A rope winding area for winding steel ropes is provided at the center of the double-row impellers, and scrapers that can move up and down are provided in the gaps between the ceramic flat membranes of the ceramic flat membrane assembly, and the scrapers are connected to the double-row impellers at the left and right ends of the buoyancy plate through a group of steel ropes;

[0022] Through the structural setting of the buoyancy plate, the microalgae liquid swinging left and right in the shell can be used to raise and lower the scraper to scrape the surface of the ceramic flat membrane, further reducing the risk of the ceramic flat membrane surface being blocked by microalgae.

[0023] Furthermore, the end surface of the scraper that contacts the side of the ceramic flat membrane is provided with bristles for scraping the ceramic flat membrane. The bristles can avoid scratching and wearing the ceramic flat membrane, while improving the scraping efficiency; the top surface and the bottom surface of the buoyancy plate corresponding to the position of the steel rope are provided with conduits for limiting the movement of the steel rope. The conduits can improve the transmission efficiency of the steel rope and avoid the occurrence of situations such as steel rope entanglement.

[0024] The beneficial effects of the present invention are:

[0025] (1) The cross-flow microalgae harvesting device of the present invention can greatly reduce the risk of blockage when using the ceramic flat membrane to concentrate the microalgae liquid by allowing the microalgae liquid to flow in the shell and arranging each ceramic flat membrane of the ceramic flat membrane assembly vertically.

[0026] (2) The cross-flow microalgae harvesting equipment of the present invention uses a buoyancy plate to suspend the ceramic flat membrane assembly, and cooperates with a sedimentation tank and a lifting guide groove to move up and down, thereby reducing the exposure of each ceramic flat membrane of the ceramic flat membrane assembly above the surface of the microalgae liquid, thereby improving the concentration efficiency of the ceramic flat membrane for the microalgae liquid.

[0027] (3) The control component of the cross-flow microalgae harvesting equipment of the present invention cooperates with the spring rod and the hydraulic control rod, and utilizes the force of the water pump to make the hydraulic control rod realize reciprocating lifting and lowering operation, so as to meet the driving effect of the shell to swing left and right, thereby realizing the left and right reciprocating circulation of the microalgae liquid in the shell and achieving the effect of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the appearance of a cross-flow microalgae harvesting device according to Example 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the cross-flow microalgae harvesting device according to Example 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the appearance of a cross-flow microalgae harvesting device according to Example 2 of the present invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of a cross-flow microalgae harvesting device according to Embodiment 2 of the present invention;

[0032] Figure 5 This is a schematic diagram of the appearance of a cross-flow microalgae harvesting device according to Example 3 of the present invention;

[0033] Figure 6 This is a schematic diagram of the internal structure of a cross-flow microalgae harvesting device according to Example 3 of the present invention;

[0034] Figure 7It is a schematic diagram of the structure of the ceramic flat membrane assembly and the buoyancy plate of Examples 1 and 2 of the present invention;

[0035] Figure 8 Schematic diagram of the structure of the ceramic flat membrane assembly and the buoyancy plate of Example 3 of the present invention;

[0036] Fig. 9 is a schematic structural diagram of a buoyancy plate according to Embodiment 3 of the present invention;

[0037] Fig.10 Schematic diagram of the double-row impeller structure of the buoyancy plate of Example 3 of the present invention;

[0038] Fig.11 is a schematic diagram of the spring rod structure of embodiment 3 of the present invention;

[0039] Fig.12 is a schematic diagram of the hydraulic control rod structure of Example 3 of the present invention;

[0040] Fig.13 1 is a schematic diagram of the main structure of the hydraulic control rod of the hydraulic control rod of Example 3 of the present invention;

[0041] Fig.14 Schematic diagram of the blocking plate structure of the hydraulic control rod of Example 3 of the present invention;

[0042] Fig.15 Schematic diagram of the block structure of the hydraulic control rod of Example 3 of the present invention;

[0043] Among them, 1-shell, 11-sink, 12-lifting guide, 13-water pump,

[0044] 2-ceramic flat membrane assembly, 21-ceramic flat membrane, 22-card, 23-collecting pipe,

[0045] 3-buoyancy plate, 31-first slot, 32-double-row impeller, 321-rope winding area, 33-scraper, 34-duct,

[0046] 4- reflux pipe, 41- liquid pump,

[0047] 5-support shaft, 51-limiting plate, 511-strip hole,

[0048] 6-Hydraulic rod,

[0049] 7-spring rod, 71-spring rod tube, 72-spring rod body, 73-limiting ring, 74-spring,

[0050] 8-hydraulic control rod, 81-hydraulic control rod body, 811-piston chamber, 812-liquid injection chamber, 813-liquid inlet, 82-hydraulic control rod body, 821-liquid discharge port, 83-blocking piece, 831-second card groove, 84-piston ring, 841-groove, 85-card block, 851-card connection end, 852-trigger end, 86-bump, 87-top block, 88-through hole, 89-magnetic plate,

[0051] 9- water tank, 91- first inlet, 92- second inlet, 93- outlet. DETAILED DESCRIPTION

[0052] The present invention is further described in detail below in conjunction with specific implementation methods to better reflect the advantages of the present invention. Example

[0053] like Figure 1 and 2 As shown, a cross-flow microalgae harvesting device comprises a housing 1, a ceramic flat membrane assembly 2 for concentrating microalgae liquid, and a control assembly for making the microalgae liquid flow in the housing 1.

[0054] like Figure 2 and 7 As shown, the ceramic flat membrane assembly 2 is composed of four groups of ceramic flat membranes 21 arranged in parallel at equal intervals, and the four groups of ceramic flat membranes 21 are clamped and fixed by four groups of clamping plates 22 provided at the upper and lower ends. The two groups of clamping plates 22 at the upper ends of the four groups of ceramic flat membranes 21 are connected with buoyancy plates 3 for suspending the ceramic flat membrane assembly 2 by utilizing buoyancy. The water outlets of the four groups of ceramic flat membranes 21 are connected to the collecting pipe 23. The buoyancy plates 3 are connected to the clamping plates 22 by steel ropes, thereby ensuring that the buoyancy plates 3 and the ceramic flat membrane assembly 2 have a certain travel margin when docking, thereby improving the stability of the buoyancy plates 3.

[0055] like Figure 2 As shown, the bottom of the shell 1 is provided with a trough 11 for accommodating the ceramic flat membrane assembly 2 and enabling it to be lifted up and down, and the side walls on both sides of the trough 11 are respectively provided with two groups of lifting guide grooves 12 that are slidably connected with two longitudinal rows of clamps 22, and each row of clamps 22 includes clamps 22 at the upper and lower ends of the ceramic flat membrane 21. The side wall of the shell 1 is provided with a water pump 13 for pumping the ceramic flat membrane assembly 2, and the water pump 13 is connected to the collection pipe 23 through a hose. The hose has a telescopic margin for allowing the ceramic flat membrane assembly 2 to slide up and down along the lifting guide groove 12, thereby avoiding the hose from restricting the sliding displacement of the ceramic flat membrane assembly 2.

[0056] like Figure 1As shown, the control component is a reflux pipe 4 and a liquid pump 41. One end of the reflux pipe 4 is connected to the water outlet provided on the side wall of the shell 1, and the other end of the reflux pipe 4 is connected to the water inlet provided on the side wall of the shell 1 through the liquid pump 41. The control component has a simple structure and can effectively meet the unidirectional circulation flow of the microalgae liquid in the shell 1.

[0057] The operation method of the above-mentioned cross-flow microalgae harvesting equipment is: start the liquid pump 41 to make the microalgae liquid in the shell 1 form a circulation flow in the shell 1 and the reflux pipe 4, and then start the water pump 13 to pump and discharge the water in the microalgae liquid through the ceramic flat membrane assembly 2, so as to concentrate the microalgae liquid. Example

[0058] This embodiment is basically the same as embodiment 1, except that Figure 3 and 4 As shown, the control component is a support shaft 5 and two groups of lifting parts that are alternately lifted to make the shell 1 swing left and right. The two groups of lifting parts are hydraulic rods 6. The two groups of hydraulic rods 6 are connected to the controller through relays. The setting of the hydraulic rods 6 can meet the driving effect of the shell 1 swinging left and right, thereby realizing the left and right reciprocating circulation of the microalgae liquid in the shell 1. The support shaft 5 is located directly below the shell 1 and is rotatably connected to the bottom of the shell 1. The two groups of lifting parts are respectively located directly below the shell 1 on the left and right sides of the support shaft 5, and the lifting parts are rotatably connected to the shell 1 through the rotating shaft. A group of flow limiting plates 51 are respectively inserted into the shell 1 on the left and right sides of the ceramic flat membrane assembly 2. A strip hole 511 is respectively provided at the corresponding gap between the flow limiting plate 51 and each ceramic flat membrane 21 of the ceramic flat membrane assembly 2. The control component can make the microalgae liquid in the shell 1 reciprocate left and right. Compared with the setting mode of the reflux pipe 4 and the liquid pump 41, it can effectively reduce the footprint of the device;

[0059] The operation method of the cross-flow microalgae harvesting device is as follows: the two sets of hydraulic rods 6 are controlled to be lifted and lowered alternately by a commercially available PLC controller, so that the shell 1 swings left and right periodically, so that the microalgae liquid flows left and right in the shell 1, and then the water pump 13 is started to pump water in the microalgae liquid through the ceramic flat membrane assembly 2, so as to concentrate the microalgae liquid.

[0060] During the left and right flow of the microalgae liquid, the flow limiting plate 51 reduces the flow speed of the microalgae liquid from one side to the other side, thereby preventing the shell 1 from shaking greatly due to the left and right flow of the microalgae liquid. In addition, through the combined effect of the buoyancy of the buoyancy plate 3 and the gravity of the ceramic flat membrane assembly 2 itself, the ceramic flat membrane assembly 2 moves up and down along the lifting guide groove 12 during the left and right flow of the microalgae liquid, so that the microalgae liquid in contact with the ceramic flat membrane 21 flows left and right and up and down, thereby further reducing the risk of microalgae in the microalgae liquid clogging the ceramic flat membrane 21. Example

[0061] This embodiment is basically the same as embodiment 2, except that Figure 5 and 6 As shown, the two groups of lifting parts are spring rod 7 and hydraulic control rod 8.

[0062] like Fig.11 As shown, the spring rod 7 includes a spring rod tube 71 and a spring rod main body 72, the spring rod main body 72 is slidably connected to the spring rod tube 71, and a limiting ring 73 is provided at the bottom end of the spring rod main body 72, and the bottom surface of the spring rod main body 72 is connected to the inner bottom surface of the spring rod tube 71 through a spring 74;

[0063] like Fig.12 As shown, the hydraulic control rod 8 includes a hydraulic control rod tube body 81 and a hydraulic control rod main body 82. A piston cavity 811 for the hydraulic control rod main body 82 to slide up and down is provided in the middle and upper part of the hydraulic control rod tube body 81. A liquid injection cavity 812 for injecting liquid into the piston cavity 811 is provided in the lower part of the hydraulic control rod tube body 81. A plugging piece 83 that can be rotatably opened and closed is provided at the opening of the hydraulic control rod main body 82. A piston ring 84 for limiting and sealing is provided at the bottom of the hydraulic control rod main body 82.

[0064] like Fig.13 , 14 As shown in Figures 15, a drain port 821 for releasing the pressure in the hydraulic control rod 8 is provided on the upper side wall of the hydraulic control rod body 82, a block 85 for clamping the block 83 is provided above the plugging piece 83, the block 85 is rotatably embedded in the inner wall of the hydraulic control rod body 82 through a torsion spring, and the clamping end 851 of the block 85 is located in the hydraulic control rod body 82 and clamped with the second clamping groove 831 of the plugging piece 83, the triggering end 852 of the block extends out of the side wall of the hydraulic control rod body 82, a convex block 86 for pressing down the triggering end 852 is provided on the top of the hydraulic control rod tube body 81, and a groove 841 is provided at the position of the piston ring 84 corresponding to the convex block 86.

[0065] like Fig.12As shown, a top block 87 for restoring the plugging piece 83 is provided at the bottom of the piston cavity 811 of the hydraulic control rod tube body 81, and six through holes 88 communicating with the injection cavity 812 are evenly distributed at the bottom of the piston cavity 811 around the top block 87. A magnetic plate 89 for assisting in triggering the plugging piece 83 to open is provided at the opening of the hydraulic control rod body 82, and a magnetic sheet that magnetically repels the magnetic plate 89 is embedded at the position corresponding to the position of the plugging piece 83 and the magnetic plate 89;

[0066] like Figure 6 As shown, a relay water tank 9 for compensating the injection of liquid to the hydraulic control rod 8 is provided at the front side of the water pump 13, the relay water tank 9 is connected to the water pump 13 through a first inlet 91 and a pipeline, the relay water tank 9 is connected to a pump in an external water replenishment area through a second inlet 92 and a pipeline, and the relay water tank 9 is connected to a liquid inlet 813 at the bottom of the hydraulic control rod 8 through an outlet 93 and a pipeline; by setting the relay water tank 9, filtered sewage can be injected through the second inlet 92, and the water flow power of the filtered sewage transported by other water treatment can be utilized, thereby compensating for the driving effect of the hydraulic control rod 8 and achieving an energy-saving effect;

[0067] The spring rod 7 and the hydraulic control rod 8 cooperate with each other to realize the reciprocating lifting and lowering operation of the hydraulic control rod 8 by utilizing the force of the water pump 13 to pump out water. At the same time, the spring rod 7 assists in driving the hydraulic control rod 8 to achieve the driving effect of the housing 1 swinging left and right, thereby realizing the reciprocating circulation of the microalgae liquid in the housing 1.

[0068] like Figure 8 , 9 As shown in Figure 10, a group of first slots 31 are respectively provided at the left and right ends of the buoyancy plate 3 and at the corresponding positions of the gaps between the ceramic flat membranes 21 of the ceramic flat membrane assembly 2. A double-row impeller 32 that is rotated by water flow is rotatably provided in the first slots 31. A rope winding area 321 for winding up the steel rope is provided at the center of the double-row impeller 32. A scraper 33 that can move up and down is provided in the gaps between the ceramic flat membranes 21 of the ceramic flat membrane assembly 2. The scrapers 33 are connected to the double-row impellers 32 at the left and right ends of the buoyancy plate 3 through a group of steel ropes. Bristles for scraping the ceramic flat membrane 21 are provided on the end surfaces of the scrapers 33 that contact the side surfaces of the ceramic flat membranes 21. The bristles can avoid scratching and abrasion of the ceramic flat membrane 21, and at the same time improve the scraping efficiency. A conduit 34 for limiting the movement of the steel rope is provided on the upper top surface and the lower bottom surface of the buoyancy plate 3 at the corresponding positions of the steel rope. The conduit 34 can improve the transmission efficiency of the steel rope and avoid the occurrence of situations such as steel rope winding.

[0069] Among them, the scraper 33 is provided with a strip through hole for reducing water flow resistance, and a ring-shaped counterweight block is provided at the bottom of the scraper 33; through the structural setting of the buoyancy plate 3, the microalgae liquid swinging left and right in the shell 1 can be utilized to lift and lower the scraper 33 to scrape the surface of the ceramic flat membrane 21, further reducing the risk of the surface of the ceramic flat membrane 21 being blocked by microalgae.

[0070] The operation method of the above-mentioned cross-flow microalgae harvesting equipment is as follows: water is pumped into the water pump 13 through the relay water tank 9, and the filtered sewage pumped into the external water replenishment area is injected into the injection chamber 812 of the hydraulic control rod tube body 81 through the pipeline and the liquid inlet 813. Then, as the water rises to the piston chamber 811 and continuously pushes up the hydraulic control rod body 82, when the hydraulic control rod body 82 rises to the inner top of the hydraulic control rod tube body 81, the trigger end 852 of the clamping block 85 is pushed down by the protrusion 86, so that the clamping block 85 overcomes the elastic force of the torsion spring and rotates, so that the clamping end 851 of the clamping block 85 is disengaged from the clamping connection with the second clamping groove 831 of the plugging plate 83. Under the action of the magnetic repulsion of the magnetic sheet 83, the plugging piece 83 rotates, so that water is discharged through the discharge port 821 of the hydraulic control rod body 82. During the discharge, the water pressure in the piston chamber 811 of the hydraulic control rod tube body 81 is not enough to support the lifting of the shell 1 on this side, and the hydraulic control rod body 82 falls back under the action of the shell 1. During the falling period, the block 85 recovers under the restoring force of the torsion spring, but due to the water pressure and the magnetic repulsion of the magnetic sheet between the magnetic plate 89 and the plugging piece 83, the plugging piece 83 cannot be engaged with the engaging end 851 of the block 85. When it falls to the bottom of the piston chamber 811, the plugging piece 83 is engaged with the engaging end 851 of the block 85 again by pushing up the top block 87.

[0071] During this period, when the microalgae liquid flows left and right in the shell 1, the buoyancy plate 3 guides the liquid through the strip holes 511 of the flow limiting plate 51, and uses the flow of the microalgae liquid to rotate each double-row impeller 32. At the same time, the leftward flow and the rightward flow correspond to the winding of the steel rope of each double-row impeller 32 or the releasing of the steel rope of the double-row impeller 32, respectively. Therefore, with the cooperation of the scraper 33's own gravity, it can move up and down in the gaps between each ceramic flat membrane 21 of the ceramic flat membrane assembly 2, and use its bristles to assist in scraping the ceramic flat membrane 21, thereby further reducing the risk of clogging the ceramic flat membrane 21 by the microalgae liquid.

Claims

1. A cross-flow microalgae harvesting device, characterized in that: The invention comprises a housing (1), a ceramic flat membrane assembly (2) for concentrating microalgae liquid, and a control assembly for making the microalgae liquid flow in the housing (1). The ceramic flat membrane assembly (2) comprises a plurality of groups of ceramic flat membranes (21) arranged in parallel at equal intervals, and the plurality of groups of ceramic flat membranes (21) are clamped and fixed by a plurality of groups of clamping plates (22) provided at upper and lower ends, the clamping plates (22) at the upper ends of the plurality of groups of ceramic flat membranes (21) are connected to a buoyancy plate (3) for lifting the ceramic flat membrane assembly (2) to suspend by utilizing buoyancy, and the water outlets of the plurality of groups of ceramic flat membranes (21) are connected to a collecting pipe (23). The bottom of the shell (1) is provided with a trough (11) for accommodating the ceramic flat membrane assembly (2) and enabling it to be lifted up and down, and the side walls on both sides of the trough (11) are respectively provided with a plurality of lifting guide grooves (12) for slidingly connecting with each clamping plate (22), and the side wall of the shell (1) is provided with a water pump (13) for pumping the ceramic flat membrane assembly (2), and the water pump (13) is connected to the collection pipe (23) through a hose; The control component comprises a supporting shaft (5) and two groups of lifting members that are alternately lifted and lowered to make the shell (1) swing left and right. The supporting shaft (5) is located directly below the shell (1) and is rotatably connected to the bottom of the shell (1). The two groups of lifting members are respectively located directly below the shell (1) on the left and right sides of the supporting shaft (5), and the lifting members are rotatably connected to the shell (1) via a rotating shaft. A group of flow limiting plates (51) are respectively inserted into the shell (1) on the left and right sides of the ceramic flat membrane assembly (2). A strip hole (511) is respectively provided at a position corresponding to the gap between the flow limiting plate (51) and each ceramic flat membrane (21) of the ceramic flat membrane assembly (2); The two groups of lifting parts are respectively a spring rod (7) and a hydraulic control rod (8). The spring rod (7) comprises a spring rod tube (71) and a spring rod main body (72), the spring rod main body (72) being slidably connected to the spring rod tube (71), and a limiting ring (73) is provided at the bottom end of the spring rod main body (72), and the bottom surface of the spring rod main body (72) is connected to the inner bottom surface of the spring rod tube (71) via a spring (74); The hydraulic control rod (8) comprises a hydraulic control rod tube body (81) and a hydraulic control rod main body (82); a piston chamber (811) for the hydraulic control rod main body (82) to slide up and down is provided at the middle upper part of the hydraulic control rod tube body (81); a liquid injection chamber (812) for injecting liquid into the piston chamber (811) is provided at the lower part of the hydraulic control rod tube body (81); a plugging piece (83) that can be rotatably opened and closed is provided at the opening of the hydraulic control rod main body (82); and a piston ring (84) for limiting and sealing is provided at the bottom of the hydraulic control rod main body (82). The upper side wall of the hydraulic control rod body (82) is provided with a drain port (821) for releasing the pressure in the hydraulic control rod (8); a clamping block (85) for clamping the clamping block (83) is provided above the blocking plate (83); the clamping block (85) is rotatably embedded in the inner wall of the hydraulic control rod body (82) through a torsion spring; the clamping end (851) of the clamping block (85) is located in the hydraulic control rod body (82) and is clamped with the second clamping groove (831) of the blocking plate (83); the triggering end (852) of the clamping block protrudes from the side wall of the hydraulic control rod body (82); a convex block (86) for pressing down the triggering end (852) is provided at the top of the hydraulic control rod tube body (81); a groove (841) is provided at a position corresponding to the position of the piston ring (84) and the convex block (86); A top block (87) for restoring the plugging piece (83) is provided at the bottom of the piston cavity (811) of the hydraulic control rod tube body (81), and a plurality of through holes (88) communicating with the injection cavity (812) are provided at equal angles at the bottom of the piston cavity (811) around the top block (87). A magnetic plate (89) for assisting in triggering the plugging piece (83) to open is provided at the opening of the hydraulic control rod body (82). A magnetic plate that magnetically repels the magnetic plate (89) is embedded at a position corresponding to the position of the plugging piece (83) and the magnetic plate (89). A water relay tank (9) for compensating the injection of liquid into the hydraulic control rod (8) is provided at the front side of the water pump (13). The water relay tank (9) is connected to the water pump (13) via a first inlet (91) and a pipeline. The water relay tank (9) is connected to a pump in an external water replenishment area via a second inlet (92) and a pipeline. The water relay tank (9) is connected to a liquid inlet (813) at the bottom of the hydraulic control rod (8) via an outlet (93) and a pipeline. Water pumped into the water pump (13) and filtered sewage pumped into the external water replenishment area are injected into the injection chamber (812) of the hydraulic control rod tube body (81) through the water tank (9) through the pipeline and the liquid inlet (813). Then, as the water rises to the piston chamber (811), the hydraulic control rod body (82) is continuously pushed upward. When the hydraulic control rod body (82) rises to the inner top of the hydraulic control rod tube body (81), the trigger end (852) of the clamping block (85) is pushed downward by the protrusion (86), so that the clamping block (85) overcomes the elastic force of the torsion spring and rotates, so that the clamping end (851) of the clamping block (85) is disengaged from the clamping connection with the second clamping groove (831) of the plugging plate (83). Under the action of water pressure and the magnetic repulsion force between the magnetic plate (89) and the plugging plate (83), the plugging plate (83) is rotated, so that the water is discharged through the liquid discharge port (821) of the hydraulic control rod body (82).

2. The cross-flow microalgae harvesting device according to claim 1, characterized in that: The buoyancy plate (3) is connected to the clamping plate (22) via a steel rope, and the steel rope has a telescopic margin for enabling the ceramic flat membrane assembly (2) to slide up and down along the lifting guide groove (12).

3. The cross-flow microalgae harvesting device according to claim 1, characterized in that: Alternatively, the control component is a reflux pipe (4) and a liquid pump (41), one end of the reflux pipe (4) is connected to a water outlet provided on a side wall of the shell (1), and the other end of the reflux pipe (4) is connected to a water inlet provided on a side wall of the shell (1) via the liquid pump (41).

4. The cross-flow microalgae harvesting device according to claim 1, characterized in that: The hose has a retractable margin sufficient for the ceramic flat membrane assembly (2) to slide up and down along the lifting guide groove (12).

5. The cross-flow microalgae harvesting device according to claim 1, characterized in that: Alternatively, both groups of lifting members are hydraulic rods (6), and the two groups of hydraulic rods (6) are connected to the controller via a relay.

6. The cross-flow microalgae harvesting device according to claim 1, characterized in that: A group of first slots (31) are respectively provided at the left and right ends of the buoyancy plate (3) and at positions corresponding to the gaps between the ceramic flat membranes (21) of the ceramic flat membrane assembly (2), and a double-row impeller (32) that is rotated by water flow is rotatably provided in the first slots (31). A rope winding area (321) for winding up a steel rope is provided at the center of the double-row impeller (32), and scrapers (33) that can move up and down are provided in the gaps between the ceramic flat membranes (21) of the ceramic flat membrane assembly (2), and the scrapers (33) are connected to the double-row impellers (32) at the left and right ends of the buoyancy plate (3) via a group of steel ropes.

7. The cross-flow microalgae harvesting device according to claim 6, characterized in that: Brushes for scraping the ceramic flat membrane (21) are provided on the end surface of the scraper (33) that contacts the side of the ceramic flat membrane (21), and guide tubes (34) for limiting the movement of the steel rope are provided at the top and bottom surfaces of the buoyancy plate (3) corresponding to the position of the steel rope.

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