A device for recycling carbon dioxide in a photobioreactor for cultivating red algae

Abstract

This invention relates to the field of Haematococcus pluvialis cultivation technology, specifically to a carbon dioxide recycling device within a Haematococcus pluvialis photobioreactor. The device includes an algae storage tank and several branch pipe racks evenly spaced on one side of its output end. The branch pipe racks extend vertically, with several cultivation tubes evenly spaced on both sides. Connecting pipes are fitted between opposite ends of the cultivation tubes at the same height. A pumping unit is located at the rear lower side of the branch pipe racks to pump carbon dioxide gas into the connecting pipes. A recovery unit is located at the front lower side of the branch pipe racks to recover carbon dioxide gas from the cultivation tubes and transport it to the pumping unit for storage. This invention utilizes the pumping unit to pump carbon dioxide gas into the connecting pipes, thereby promoting the circulation and rotation of the Haematococcus pluvialis within the cultivation tubes, preventing it from growing statically against the wall. The recovery unit recovers the carbon dioxide gas from the cultivation tubes and transports it to the pumping unit for storage, thus saving costs through recycling.

Description

Technical Field

[0001] The invention relates to the technical field of Haematococcus algae cultivation, in particular to a carbon dioxide recycling device in a Haematococcus algae cultivation photobioreactor. Background Art

[0002] Haematococcus pluvialis is a freshwater unicellular green algae that can accumulate astaxanthin in large quantities and presents a red color, hence the name Haematococcus pluvialis. Haematococcus pluvialis is recognized as the most ideal source of natural astaxanthin in nature. Astaxanthin, as one of the most efficient pure natural antioxidants discovered, shows good biological activity in scavenging free radicals, anti-aging, anti-tumor and immune regulation, and is widely used in functional foods, medicines and cosmetics.

[0003] The Haematococcus algae cultivation base is composed of several cultivation pipes and algae storage tanks that are tilted and built in an open field. The Haematococcus algae in the cultivation pipes grow and reproduce in large quantities through the irradiation of natural light. Since the cultivation pipes cover a long area, the Haematococcus algae are prone to become static in the cultivation pipes, and the growth of Haematococcus algae attached to the wall will affect the lighting of other Haematococcus algae in the pipes and affect the harvest of Haematococcus algae. Summary of the invention

[0004] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a carbon dioxide recycling device in a photobioreactor for cultivating Haematococcus pluvialis to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides a carbon dioxide recycling device in a photobioreactor for cultivating red algae, comprising a plurality of branch pipe racks arranged at equal intervals on one side of an algae storage tank and an output end thereof, the branch pipe rack extending vertically and having a plurality of culture tubes placed at equal intervals on both sides thereof, connecting pipes are sleeved between the opposite ends of the plurality of culture tubes at the same height, and clamps are tightly sleeved on the outer walls of both ends of the connecting pipes, a pump gas group for pumping carbon dioxide gas into the connecting pipes is arranged at the lower rear side of the branch pipe rack, and a recovery group for recovering carbon dioxide gas in the culture tubes and transporting it to the pump gas group for storage is arranged at the lower front side of the branch pipe rack;

[0006] Two vent holes are provided in the middle and front end of the connecting pipe, and the two vent holes are respectively arranged toward the outside and downward. The pump gas group includes a gas storage tank storing compressed carbon dioxide, a pair of solenoid valves for controlling the gas injection of the gas storage tank, and a plurality of vent pipes connected to the vent holes below each connecting pipe and sleeved in sequence, wherein the lowest vent pipe is connected to the solenoid valve;

[0007] The recovery group includes an air collecting tank, a booster pump installed between the air collecting tank and the outside of the air storage tank, a plurality of air collecting pipes connected to the air holes on the outside of each connecting pipe and sequentially sleeved, an air filter group rotatably arranged in the middle of the connecting pipe, and a pair of servo electric cylinders driving the air filter group to rotate, wherein the lowest air collecting pipe is connected to the top of the air collecting tank.

[0008] As a further improvement of the technical solution, a pump air pipe is symmetrically inserted into the front top of the air storage tank, the solenoid valve is installed on the pump air pipe, and an air distribution pipe is provided on the outside of the pump air pipe and in front of the solenoid valve.

[0009] As a further improvement of the present technical solution, the front end of the ventilation pipe is tightly fitted with the ventilation hole located below, and the rear end of the ventilation pipe is bent and extended to just above the outlet of the branch air pipe to be connected with a ventilation branch pipe. The ventilation branch pipe is vertically arranged, and the two adjacent ventilation pipes above and below are connected by means of two ventilation branch pipes, wherein the lowest ventilation branch pipe is fitted with the branch air pipe.

[0010] As a further improvement of the present technical solution, air inlet pipes are provided on both sides of the front end of the air storage tank, air outlet pipes are provided on both sides of the front end of the air collecting tank, the air suction port of the boosting pump is connected to the air outlet pipe through a pipe, and the air outlet port of the boosting pump is connected to the air inlet pipe through a pipe.

[0011] As a further improvement of the present technical solution, the air filter group is composed of an air filter valve and a membrane assembly that are sleeved together. The air filter valve is a round box structure with an open rear end and is in a blocked state when its central axis is consistent with the central axis of the connecting pipe. The membrane assembly is composed of a number of hollow fiber membranes and a fixed plate that are sleeved together. The fixed plate is adapted to fit in with the inner hole of the air filter valve.

[0012] As a further improvement of the present technical solution, the rear end of the gas collecting pipe is tightly fitted with the air vent located on the outside, and a hose is bonded to this end of the gas collecting pipe, and the hose is tightly fitted with the through hole opened at the front end of the air filter valve; the front end of the gas collecting pipe is bent and extended above the top of the gas collecting tank to be connected with a gas collecting branch pipe, the gas collecting branch pipe is vertically arranged, and the two adjacent gas collecting pipes above and below are connected by the two gas collecting branch pipes.

[0013] As a further improvement of the technical solution, a recovery pipe is symmetrically connected to the top of the rear end of the gas collecting tank, wherein the lower end of the gas collecting pipe located at the bottom is tightly fitted with the recovery pipe.

[0014] As a further improvement of the present technical solution, an adjustment hole is opened outward in the middle of the connecting pipe, a convex column is radially embedded on the outer side of the air filter valve and the convex column is sleeved and rotated with the adjustment hole, a pair of levers are fixedly connected to one side of the outer end of the convex column, and a linkage frame in the form of a door-shaped frame is connected between the tops of the two servo electric cylinders, and the vertical section of the linkage frame is clamped with a pair of levers and can slide.

[0015] As a further improvement of the present technical solution, the vertical section of the linkage frame is provided with a linkage sleeve in the form of a quarter arc segment on one side facing the plurality of shift rods, an arc groove is provided inside the linkage sleeve, the linkage sleeve is clamped with a pair of shift rods and slides up and down, a pin is embedded between the outer ends of the pair of shift rods and the pin is plugged into the arc groove and slides.

[0016] As a further improvement of the technical solution, a plurality of brackets are vertically welded at equal intervals on both sides of the pipe support rack, the ends of the breeding pipes are overlapped on the brackets, support rods are welded on both sides of the bottom of the pipe support rack, and the support rods are fixedly connected to the servo electric cylinder by bolts.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The carbon dioxide recycling device in the Haematococcus algae cultivation photobioreactor connects two adjacent cultivation tubes through a connecting pipe, and a pumping group and a recovery group are arranged below the connecting pipe. The pumping group is used to pump carbon dioxide gas into the connecting pipe, and the Haematococcus pluvialis in the cultivation tube is driven to circulate by adding carbon dioxide into the cultivation tube to prevent the Haematococcus pluvialis from growing against the wall in a static state; the recovery group is used to recover the carbon dioxide gas in the cultivation tube and transport it to the pumping group for storage. Since the carbon dioxide is a purchased finished product, cost can be saved through recycling.

[0019] 2. The carbon dioxide recycling device in the Haematococcus algae cultivation photobioreactor has an air filter group arranged in the connecting pipe. The rotation of the air filter group can control the opening and closing of the connecting pipe, so that the carbon dioxide gas enters the cultivation pipe from one connecting pipe. When it reaches another connecting pipe, the gas is filtered out by the air filter group and led out of the cultivation pipe by the gas collecting pipe, and then collected by the gas collecting tank. The carbon dioxide gas is then pressurized by a booster pump and stored in a gas storage tank for use.

[0020] 3. The carbon dioxide recycling device in the Haematococcus algae culture photobioreactor controls the lifting of the linkage frame by means of a pair of servo electric cylinders. The linkage frame drives the pin to slide along the arc groove by means of the linkage sleeve and the arc groove, and triggers a pair of levers to drive the filter valve to rotate, thereby realizing the open and closed state of the connecting pipe. The device blocks the carbon dioxide and filters the gas from the Haematococcus algae culture solution by means of the pressure difference generated by its transportation. The design is ingenious and does not take up space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0022] Figure 1 It is a schematic diagram of the overall partial assembly structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 The starting end assembly front view;

[0024] Figure 3 It is a schematic diagram of the pipe support structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the assembly structure of several pairs of connecting pipes, pump gas groups and recovery groups of the present invention;

[0026] Figure 5 For the present invention Figure 4 The main view;

[0027] Figure 6 It is a schematic diagram of the assembly structure of the pump gas group and the recovery group of the present invention;

[0028] Figure 7 It is a schematic diagram of the assembly structure of several pairs of connecting pipes and linkage frames of the present invention;

[0029] Figure 8 It is a schematic diagram of the assembly structure of several air filter groups and linkage frames of the present invention;

[0030] Fig. 9 It is a schematic diagram of the assembly structure of a plurality of connecting pipes, a plurality of ventilation pipes and a plurality of gas collecting pipes of the present invention;

[0031] Fig.10 For the present invention Fig. 9 The local split diagram of ;

[0032] Fig.11 It is a schematic diagram of the assembly structure of the linkage frame of the present invention.

[0033] The meaning of each number in the figure is:

[0034] 100, algae storage tank; 110, pipe support rack; 111, bracket; 112, support rod; 120, culture pipe;

[0035] 200, connecting pipe; 201, adjusting hole; 202, vent hole; 210, sealing sleeve;

[0036] 300, pump gas group; 310, gas storage tank; 311, pump gas pipe; 312, gas distribution pipe; 313, air intake pipe; 320, solenoid valve; 330, ventilation pipe; 331, ventilation distribution pipe;

[0037] 400, recovery group; 410, gas collecting tank; 411, recovery pipe; 412, gas outlet pipe; 420, booster pump; 430, gas collecting pipe; 431, gas collecting branch pipe; 440, gas filter group; 441, gas filter valve; 442, membrane assembly; 443, lever; 450, linkage frame; 451, linkage sleeve; 452, arc groove; 460, servo electric cylinder. DETAILED DESCRIPTION

[0038] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as falling within the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

[0039] The terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inside", "outside" and the like used herein to indicate positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0040] See also Figure 1-Figure 11 As shown, the present invention provides a carbon dioxide recycling device in a photobioreactor for cultivating Haematococcus algae, comprising an algae storage tank 100 and a plurality of branch pipe racks 110 arranged at equal intervals on one side of its output end, the branch pipe rack 110 extends vertically and a plurality of culture pipes 120 are placed at equal intervals on both sides thereof, a pump is arranged on the algae storage tank 100 to pump Haematococcus pluvialis into the plurality of culture pipes 120 to receive light and grow; connecting pipes 200 are sleeved between the opposite ends of the plurality of culture pipes 120 at the same height, and clamps are tightly sleeved on the outer walls of both ends of the connecting pipes 200, and sealing sleeves 210 are bonded to the inner sides of both ends of the connecting pipes 200, which are made of rubber material, and when the clamps are used to tighten the two ends of the connecting pipe 200, the sealing sleeves are squeezed to press the outer walls of the ends of the culture pipes 120, thereby ensuring the sealing of the connection;

[0041] A plurality of brackets 111 are vertically welded at equal intervals on both sides of the pipe support frame 110, and the ends of the culture pipes 120 are overlapped on the brackets 111, so that the culture pipes 120 are placed stably and the connecting pipe 200 is conveniently installed coaxially;

[0042] A pumping group 300 for pumping carbon dioxide gas into the connecting pipe 200 is provided at the lower rear side of the support pipe rack 110. By adding carbon dioxide into the culture pipe 120, the Haematococcus pluvialis in the culture pipe 120 is driven to circulate and rotate, thereby preventing the algae from growing against the wall in a static state. A recovery group 400 for recovering the carbon dioxide gas in the culture pipe 120 and transporting it to the pumping group 300 for storage is provided at the lower front side of the support pipe rack 110. Since the carbon dioxide is a purchased finished product, costs can be saved by recycling it.

[0043] Specifically, two vent holes 202 are provided in the middle and at the front end of the connecting pipe 200, and the two vent holes 202 are respectively arranged to face outward and downward. The pumping group 300 includes a gas tank 310 storing compressed carbon dioxide, a pair of solenoid valves 320 for controlling the gas injection of the gas tank 310, and a plurality of vent pipes 330 connected to the vent holes 202 below each connecting pipe 200 and sleeved in sequence, wherein the lowest vent pipe 330 is connected to the solenoid valve 320; that is, the airway is opened by controlling the power supply of the solenoid valve 320, so that the compressed carbon dioxide gas in the gas tank 310 is ejected; the connection port between the vent pipe 330 and the vent hole 202 located below is sleeved with a one-way valve for allowing the vent pipe 330 to eject gas to the connecting pipe 200, so as to prevent gas backflow;

[0044] The recovery group 400 includes a gas collecting tank 410, a booster pump 420 installed between the gas collecting tank 410 and the outside of the gas storage tank 310, a plurality of gas collecting pipes 430 connected to the vent holes 202 on the outside of each connecting pipe 200 and connected in sequence, a gas filter group 440 rotatably arranged in the middle of the connecting pipe 200, and a pair of servo electric cylinders 460 driving the gas filter group 440 to rotate. The rotation of the gas filter group 440 controls the opening and closing of the inside of the connecting pipe 200, so that the carbon dioxide gas enters the breeding pipe 120 from one connecting pipe 200, and when it reaches the other connecting pipe 200, the gas is filtered out by the gas filter group 440 and led out of the breeding pipe 120 by the gas collecting pipe 430, and then collected by the gas collecting tank 410;

[0045] The lowest gas collecting pipe 430 is connected to the top of the gas collecting tank 410; the connecting port of the gas collecting pipe 430 and the gas collecting tank 410 is provided with a one-way valve to allow the connecting pipe 200 to deliver gas into the gas collecting tank 410 to prevent gas backflow.

[0046] Furthermore, a pump air pipe 311 is symmetrically inserted at the top of the front end of the gas storage tank 310, and a solenoid valve 320 is installed on the pump air pipe 311. A gas distribution pipe 312 is provided outside the pump air pipe 311 and in front of the solenoid valve 320, and the solenoid valve 320 controls the compressed gas in the gas storage tank 310 to be ejected;

[0047] like Fig. 9 and Fig.10 As shown, the front end of the vent pipe 330 is tightly sleeved with the vent hole 202 located below, the rear end of the vent pipe 330 is bent and extends to the top of the outlet of the gas branch pipe 312 and is connected with a vent branch pipe 331, the vent branch pipe 331 is vertically arranged, and the two adjacent vent pipes 330 are connected by sleeves of the two vent branch pipes 331, wherein the lowermost vent branch pipe 331 is sleeved with the gas branch pipe 312, so that the plurality of connecting pipes 200 can obtain the gas sprayed by the gas storage tank 310, so that each culture pipe 120 can obtain gas to adjust the living state of Haematococcus pluvialis;

[0048] Inlet pipes 313 are provided on both sides of the front end of the gas storage tank 310, and outlet pipes 412 are provided on both sides of the front end of the gas collecting tank 410. The suction port of the boosting pump 420 is connected to the outlet pipe 412 through a pipe, and the outlet port of the boosting pump 420 is connected to the inlet pipe 313 through a pipe; both the outlet pipe 412 and the inlet pipe 313 are provided with a one-way valve, so that the outlet pipe 412 is only used to discharge air, and the inlet pipe 313 is only used to take in air; the gas collected in the gas collecting tank 410 is pressurized by the boosting pump 420 and compressed and stored in the gas storage tank 310; in addition, the middle part of the gas collecting tank 410 is filled with an adsorbent with hygroscopic and adsorption properties, such as activated carbon, molecular sieves and porous ceramics, so as to absorb moisture in the carbon dioxide gas.

[0049] Specifically, Fig. 9 and Fig.10 As shown, the air filter group 440 is composed of an air filter valve 441 and a membrane assembly 442 that are sleeved together. The air filter valve 441 is a round box structure with an opening at the rear end and is in a blocked state when its central axis is consistent with the central axis of the connecting pipe 200. When the air filter valve 441 is rotated and its central axis is perpendicular to the central axis of the connecting pipe 200, the connecting pipe 200 is in an unobstructed state; the membrane assembly 442 is composed of a plurality of hollow fiber membranes and a fixed plate that are sleeved together. The fixed plate is adapted to be fitted and matched with the inner hole of the air filter valve 441, that is, the fixed plate is used to fix a plurality of hollow fiber membranes, and under the pressure of the compressed carbon dioxide sprayed out from the gas storage tank 310, the gas passes through the hollow fiber membranes and enters the space between the fixed plate and the air filter valve 441, and is then sucked out.

[0050] Furthermore, the rear end of the gas collecting pipe 430 is tightly sleeved with the vent hole 202 located on the outside, and a hose is bonded to this end of the gas collecting pipe 430, and the hose is tightly sleeved with the through hole opened at the front end of the gas filter valve 441; the hose is made of silicone, which is convenient for the gas filter valve 441 to be stored and released when rotating; the front end of the gas collecting pipe 430 is bent and extends above the top of the gas collecting tank 410 to communicate with the gas collecting branch pipe 431, which is vertically arranged, and the two upper and lower adjacent gas collecting pipes 430 are connected by sleeved with the two gas collecting branch pipes 431;

[0051] A recovery pipe 411 is symmetrically connected to the top of the rear end of the gas collecting tank 410, wherein the lower end of the gas collecting pipe 430 located at the bottom is tightly fitted with the recovery pipe 411, so that several connecting pipes 200 can lead out the gas in the breeding pipe 120 behind them.

[0052] Specifically, Figure 7 , Figure 8 and Fig.11 As shown, the middle part of the connecting pipe 200 is provided with an adjustment hole 201 toward the outside, and a convex column is radially embedded on the outside of the air filter valve 441, and the convex column is sleeved and rotated with the adjustment hole 201, and the sleeve is provided with a sealing ring for sealing treatment; a pair of levers 443 are fixedly connected to one side of the outer end of the convex column, and a linkage frame 450 in the form of a door-shaped frame is connected between the upper parts of the two servo electric cylinders 460, and the vertical section of the linkage frame 450 is clamped and slidably connected with the pair of levers 443;

[0053] A linkage sleeve 451 in the shape of a quarter arc segment is provided on the vertical section of the linkage frame 450 toward one side of the plurality of levers 443. An arc groove 452 is provided inside the linkage sleeve 451. The linkage sleeve 451 is engaged with a pair of levers 443 and slides up and down. A pin is embedded between the outer ends of the pair of levers 443 and the pin is plugged into and slides in the arc groove 452. The linkage frame 450 is driven up and down by the servo electric cylinder 460 to drive the pin to slide along the arc groove 452, thereby triggering the pair of levers 443 to drive the air filter valve 441 to rotate, thereby realizing the open and closed state of the connecting pipe 200. Support rods 112 are welded on both sides of the bottom of the pipe support frame 110, and the support rods 112 are fixedly connected to the servo electric cylinder 460 by bolts.

[0054] When the carbon dioxide recycling device in the Haematococcus algae cultivation photobioreactor of the present invention is used, the electromagnetic valve 320 is energized to open and release the compressed carbon dioxide gas in the gas storage tank 310, which is pumped into the plurality of connecting pipes 200 and enters the cultivation pipe 120, so that the carbon dioxide gas is used to promote the Haematococcus pluvialis in the cultivation pipe 120 to circulate and rotate, thereby preventing the Haematococcus pluvialis from growing against the wall in a static state;

[0055] When it is necessary to collect carbon dioxide, the servo electric cylinder 460 is started to drive the linkage frame 450 to descend, and the linkage sleeve 451 and the arc groove 452 are used to guide the lever 443 to rotate 90 degrees, thereby driving the air filter valve 441 in the connecting pipe 200 to rotate and seal it, so that the carbon dioxide gas enters the breeding pipe 120 from one connecting pipe 200, and when it reaches the other connecting pipe 200, the gas is filtered out by the membrane assembly 442 in the air filter valve 441, and then the booster pump 420 is started to suck the gas collected in the gas collecting tank 410, and the booster is discharged to the gas storage tank 310 for recovery and storage, so that the carbon dioxide gas can be recovered and reused.

[0056] It should be noted that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for recycling carbon dioxide in a photobioreactor for cultivating red algae, comprising an algae storage tank (100) and a plurality of pipe support racks (110) arranged at equal intervals on one side of its output end, the pipe support rack (110) extending vertically and having a plurality of culture pipes (120) arranged at equal intervals on both sides thereof, connecting pipes (200) being sleeved between opposite ends of the plurality of culture pipes (120) at the same height, and clamps being tightly sleeved on the outer walls of both ends of the connecting pipes (200), characterized in that: A pumping group (300) for pumping carbon dioxide gas into the connecting pipe (200) is provided at the lower rear side of the pipe support frame (110), and a recovery group (400) for recovering carbon dioxide gas in the breeding pipe (120) and transporting it to the pumping group (300) for storage is provided at the lower front side of the pipe support frame (110); Two ventilation holes (202) are provided in the middle and at the front end of the connecting pipe (200), and the two ventilation holes (202) are arranged to face outward and downward respectively. The gas pump group (300) comprises a gas storage tank (310) storing compressed carbon dioxide, a pair of solenoid valves (320) for controlling the gas injection of the gas storage tank (310), and a plurality of ventilation pipes (330) connected to the ventilation holes (202) below each connecting pipe (200) and connected in sequence, wherein the lowest ventilation pipe (330) is connected to the solenoid valve (320); The recovery group (400) comprises a gas collecting tank (410), a booster pump (420) installed between the gas collecting tank (410) and the outside of the gas storage tank (310), a plurality of gas collecting pipes (430) connected to the vent holes (202) on the outside of each connecting pipe (200) and sleeved in sequence, a gas filtering group (440) rotatably arranged in the middle of the connecting pipe (200), and a pair of servo electric cylinders (460) driving the gas filtering group (440) to rotate, wherein the lowest gas collecting pipe (430) is arranged in communication with the top of the gas collecting tank (410); Both sides of the front end of the gas storage tank (310) are provided with air inlet pipes (313); both sides of the front end of the gas collecting tank (410) are provided with air outlet pipes (412); the air intake port of the booster pump (420) is connected to the air outlet pipe (412) via a pipe; and the air outlet port of the booster pump (420) is connected to the air inlet pipe (313) via a pipe; The air filter group (440) is composed of an air filter valve (441) and a membrane assembly (442) that are sleeved together. The air filter valve (441) is a round box structure with an open rear end and is in a blocked state when its central axis is aligned with the central axis of the connecting pipe (200). The membrane assembly (442) is composed of a plurality of hollow fiber membranes and a fixed plate that are sleeved together. The fixed plate is adapted to be sleeved and matched with the inner hole of the air filter valve (441). The top of the rear end of the gas collecting tank (410) is symmetrically connected to a recovery pipe (411), wherein the lower end of the gas collecting pipe (430) located at the bottom is tightly sleeved with the recovery pipe (411); An adjusting hole (201) is provided in the middle of the connecting pipe (200) toward the outside, a convex column is radially embedded on the outside of the air filter valve (441), and the convex column is sleeved and rotated with the adjusting hole (201), a pair of levers (443) is fixedly connected to one side of the outer end of the convex column, a linkage frame (450) in the form of a door-shaped frame is connected between the upper parts of the two servo electric cylinders (460), and a vertical section of the linkage frame (450) is snap-fitted with the pair of levers (443) and is slidable; A vertical section of the linkage frame (450) is provided with a linkage sleeve (451) in the form of a quarter arc segment on one side facing the plurality of levers (443). An arc groove (452) is provided inside the linkage sleeve (451). The linkage sleeve (451) is engaged with a pair of levers (443) and slides up and down. A pin is embedded between the outer ends of the pair of levers (443) and is plugged into and slides in the arc groove (452).

2. The device for recycling carbon dioxide in a photobioreactor for culturing Haematococcus coccus according to claim 1, characterized in that: A pump air pipe (311) is symmetrically plugged into the top of the front end of the air storage tank (310), the solenoid valve (320) is mounted on the pump air pipe (311), and an air distribution pipe (312) is provided outside the pump air pipe (311) and in front of the solenoid valve (320); The front end of the ventilation pipe (330) is tightly sleeved with the ventilation hole (202) located below, and the rear end of the ventilation pipe (330) is bent and extends to the top of the outlet of the air branch pipe (312) to communicate with a ventilation branch pipe (331). The ventilation branch pipe (331) is arranged vertically, and two ventilation pipes (330) adjacent to each other are connected by sleeve-fitting the two ventilation branch pipes (331), wherein the lowermost ventilation branch pipe (331) is sleeve-fitted with the air branch pipe (312).

3. The device for recycling carbon dioxide in a photobioreactor for culturing Haematococcus coccus according to claim 2, characterized in that: The rear end of the gas collecting pipe (430) is tightly fitted with the vent hole (202) located on the outside, and a hose is bonded to this end of the gas collecting pipe (430), and the hose is tightly fitted with the through hole opened at the front end of the gas filter valve (441); the front end of the gas collecting pipe (430) is bent and extends above the top of the gas collecting tank (410) to communicate with a gas collecting branch pipe (431), the gas collecting branch pipe (431) is arranged vertically, and two upper and lower adjacent gas collecting pipes (430) are connected by sleeve-fitting the two gas collecting branch pipes (431).

4. The device for recycling carbon dioxide in a photobioreactor for culturing Haematococcus coccus according to claim 1, characterized in that: A plurality of brackets (111) are welded vertically at equal intervals on both sides of the pipe support frame (110); ends of the culture pipes (120) are overlapped on the brackets (111); support rods (112) are welded on both sides of the bottom of the pipe support frame (110); and the support rods (112) are fixedly connected to the servo electric cylinder (460) by bolts.

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