An extraction device and extraction method for microalgae oil

Abstract

The present invention relates to the technical field of microalgae oil extraction devices, and particularly to a microalgae oil extraction device and an extraction method. The technical solution includes a chassis, a splitting component is installed inside the chassis. The splitting component includes a piston compression mechanism and a homogenization mechanism, and also includes a cavitation oxygen prevention component which is installed inside the chassis. The present invention prevents air from being contained in the microalgae suspension entering the pressurization chamber, thereby effectively reducing the oxidation reaction of the microalgae suspension. By filling the recovery tank with an inert gas that does not react with the microalgae suspension, gas can be injected into the microalgae suspension while compressing the microalgae suspension, and the gas injection stops when the compression stops. Moreover, through the gas injection, on the one hand, bubbles can be generated in the microalgae suspension, and on the other hand, air pressure can be formed inside the pressurization chamber, enabling more stable and uniform pressurization of the microalgae suspension.

Description

Technical Field

[0001] The present invention relates to the technical field of microalgae oil extraction devices, and in particular, to a microalgae oil extraction device and an extraction method. Background Art

[0002] A microalgae oil extraction device is a device specifically used to extract oil from microalgae cells. It usually includes a crushing device, which is used to break the cell wall of microalgae and release the oil. It can be a high-pressure homogenization device, a ball mill or other mechanical crushing equipment.

[0003] In a high-pressure homogenization device, high-pressure treatment needs to be carried out on microalgae. During the high-pressure treatment process, the temperature usually rises because high pressure increases the internal energy of the fluid, resulting in a temperature increase. The increase in temperature can accelerate the oxidation reaction of oil because high temperature increases the average kinetic energy of molecules, making the reaction rate increase. Since air contains oxygen, and oxygen is a strong oxidant that can react with unsaturated fatty acids in oil, resulting in oil oxidation. During the high-pressure treatment process, due to the increase in pressure, oxygen is more likely to dissolve in the suspension, increasing the chance of reaction with oil. Summary of the Invention

[0004] The object of the present invention is to propose a microalgae oil extraction device and an extraction method for the problems existing in the background art.

[0005] On the one hand, the present invention proposes a microalgae oil extraction device, including a chassis. A splitting component is installed in the chassis. The splitting component includes a piston compression mechanism and a homogenization mechanism. The piston compression mechanism increases the pressure of the microalgae suspension and breaks the microalgae under the action of the homogenization mechanism. It further includes:

[0006] A cavitation oxygen prevention component, which is installed in the chassis. The cavitation oxygen prevention component includes a bubble generation component that discharges inert gas into the interior of the microalgae suspension under the drive of the piston compression mechanism, a bubble homogenization component installed on the bubble generation component to control the bubble generation frequency, a gas volume control component installed in the chassis to control the gas volume transported into the microalgae suspension within the single movement cycle time of the piston compression mechanism, a gas recovery component installed on the homogenization mechanism to recover the inert gas inside the broken microalgae suspension, a cooling component installed in the chassis to cool the inert gas, and a liquid inlet de-bubbling component installed on the homogenization mechanism to eliminate the bubbles inside the microalgae suspension.

[0007] The bubble generation component, the bubble homogenization component and the gas recovery component form a closed internal circulation gas path through the cooling component.

[0008] Optionally, the homogenization mechanism includes a circulation block fixedly installed on the chassis. The circulation block is provided with a plurality of pressurization chambers and a conveying groove. A liquid inlet is provided below the pressurization chamber. A first one-way valve is fixedly installed in the liquid inlet. A conveying hole communicating with the conveying groove is provided above the pressurization chamber. A second one-way valve is fixedly installed in the conveying hole. A homogenization valve communicating with the conveying groove is fixedly installed on the circulation block. A liquid inlet pipe communicating with the plurality of liquid inlets is fixedly installed at the bottom of the circulation block. A connecting pipe is fixedly installed on the liquid inlet pipe. A hopper is fixedly installed on the connecting pipe.

[0009] Optionally, the piston compression mechanism includes a compression motor fixedly installed in the chassis, a crankshaft and an input shaft rotatably installed in the chassis. A first gear is fixedly installed on the crankshaft. A second gear is fixedly installed on the input shaft. The second gear meshes with the first gear. A transmission belt is fixedly installed on the output shaft and the input shaft of the compression motor. A plurality of connecting rods are rotatably installed on the crankshaft. A plurality of guide rods are slidably installed in the chassis. The guide rods correspond to the plurality of connecting rods one by one and are rotatably connected. A piston is fixedly installed on the guide rod. The piston is slidably connected to the circulation block and is located inside the pressurization chamber.

[0010] Optionally, the bubble generation assembly includes a discharge hole provided on the piston. A third one-way valve is fixedly installed at one end of the discharge hole located inside the pressurization chamber. An air chamber communicating with the discharge hole is fixedly installed on the piston. The air chamber is fixedly connected to the guide rod. A plurality of air cylinders are fixedly installed in the chassis. The air cylinders correspond to the pistons one by one. A fourth one-way valve and a first joint are fixedly installed on the air cylinder. A plug is slidably installed in the air cylinder. A connecting rod is fixedly installed on the plug. The connecting rod penetrates through one side of the air cylinder and extends to the outside of the air cylinder. The connecting rod is slidably connected to the air cylinder;

[0011] A plurality of sliding grooves are rotatably installed in the chassis. Slide rods are slidably installed on both sides of the sliding groove. One of the slide rods is rotatably connected to the connecting rod. The other slide rod is rotatably connected to the guide rod. A second joint is fixedly installed on the air chamber. The second joint communicates with the first joint.

[0012] Optionally, the bubble homogenization assembly is a motor fixedly installed in the air chamber. A blocking piece is fixedly installed on the output shaft of the motor. The blocking piece abuts against the piston.

[0013] Optionally, the air volume control component includes a hydraulic rod fixedly installed in the chassis. A lifting plate is fixedly installed on the output shaft of the hydraulic rod. The lifting plate is slidably connected to the chassis. The sliding groove is rotatably installed on the lifting plate. The air volume control component further includes a positioning structure;

[0014] The positioning structure includes oil drums fixedly installed on the upper and lower sides at both ends of the lifting plate. A positioning rod is slidably installed in the oil drum. Oil pipes are fixedly installed on two oil drums at the same end. A first electric control valve is fixedly installed on two oil pipes at the same end. The oil drums, oil pipes and the first electric control valve are filled with hydraulic oil.

[0015] Optionally, the gas recovery assembly includes a recovery tank fixedly installed at the outlet of the homogenizing valve. An exhaust port is provided at the top of the recovery tank. A third joint is fixedly installed on the exhaust port. A plurality of first vibrating rods and a discharge pipe communicated with the recovery tank are fixedly installed at the bottom of the recovery tank. A second electric control valve is fixedly installed in the discharge pipe. A liquid level gauge is fixedly installed in the recovery tank.

[0016] Optionally, the cooling assembly includes an evaporator and a refrigeration system connected to the evaporator. A cooling pipe is installed in the evaporator. A fourth joint and a fifth joint communicated with the cooling pipe are installed on the evaporator. The third joint is communicated with the fourth joint. The fifth joint is communicated with the fourth one-way valve.

[0017] Optionally, the liquid inlet and defoaming assembly includes a second vibrating rod fixedly installed in the hopper. A third electric control valve is fixedly installed in the connecting pipe.

[0018] On the other hand, the present invention proposes a method for extracting microalgae oil, which is applied to the above-mentioned microalgae oil extraction device. The method includes the following steps:

[0019] Step 1: Place the microalgae suspension inside the hopper and close the third electric control valve;

[0020] Step 2: Start the piston compression mechanism. The piston compression mechanism generates suction on the liquid inlet pipe and generates a thrust on the conveying groove to discharge the gas inside the liquid inlet pipe, avoiding the generation of bubbles when the microalgae suspension enters the liquid inlet pipe;

[0021] Step 3: Open the third electric control valve. Under the action of the piston compression mechanism, the microalgae suspension enters the pressurization chamber and is pressurized, and then the microalgae suspension enters the homogenizing valve for crushing and finally flows into the recovery tank;

[0022] Step 4: Fill the recovery tank with inert gas. Under the action of the piston compression mechanism, the inert gas inside the recovery tank enters the air cylinder after being cooled by the evaporator and is squeezed into the extrusion chamber;

[0023] Step 5: The inert gas entering the pressurization chamber will form bubbles and enter the recovery tank again along with the microalgae suspension, and then repeat the cycle.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] In the present invention, by allowing the gas inside the microalgae suspension to overflow upward, it is possible to prevent the microalgae suspension entering the pressurization chamber from containing air, thereby effectively reducing the oxidation reaction of the microalgae suspension. By filling the recovery tank with an inert gas that does not react with the microalgae suspension, it is possible to inject gas into the microalgae suspension while compressing the microalgae suspension, and stop the gas injection when the compression stops. Moreover, through the injection of gas, on the one hand, bubbles can be generated in the microalgae suspension, and on the other hand, air pressure can be formed inside the pressurization chamber, enabling more stable and uniform pressurization of the microalgae suspension.

[0026] Furthermore, the gas entering the air cylinder through the recovery tank will pass through the evaporator. The gas is cooled by the evaporator, and the cooled gas can cool the microalgae suspension. Since the gas can uniformly contact the microalgae suspension, the microalgae suspension can be uniformly cooled, thereby preventing the microalgae suspension from generating excessive heat when being squeezed, avoiding oxidation of the microalgae suspension at high temperatures, and preventing high temperatures from damaging the quality of the oil.

[0027] Still further, making the gas entering the discharge hole non - continuous helps to generate stable and uniformly sized bubbles in the microalgae suspension, enabling the bubbles to be more evenly distributed in the microalgae suspension, effectively preventing the accumulation of bubbles in the suspension caused by continuous injection, which may affect the homogenization effect, and facilitating the rapid dispersion and rupture of the bubbles, thereby improving the uniformity of microalgae fragmentation under the action of cavitation bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The structural schematic diagram of the chassis of the present invention is given;

[0029] Figure 2 The structural schematic diagram inside the chassis of the present invention;

[0030] Figure 3 The structural schematic of the piston compression mechanism of the present invention Figure 1 ;

[0031] Figure 4 The structural schematic of the piston compression mechanism of the present invention Figure 2 ;

[0032] Figure 5 The structural schematic diagram of the bubble generation component of the present invention;

[0033] Figure 6 The structural schematic diagram inside the air cylinder of the present invention;

[0034] Figure 7 The structural schematic diagram of the gas volume control component of the present invention;

[0035] Figure 8 It is a schematic structural diagram of the positioning structure of the present invention;

[0036] Figure 9 It is a schematic structure of the circulation block of the present invention Figure 1 ;

[0037] Figure 10 It is a schematic structure of the circulation block of the present invention Figure 2 ;

[0038] Figure 11 It is a schematic structural diagram of the inside of the circulation block of the present invention;

[0039] Figure 12 It is Figure 9 a partial enlarged view of the position A in

[0040] Figure 13 It is a schematic structural diagram of the bubble homogenization component of the present invention;

[0041] Figure 14 It is a schematic diagram of the position of the discharge hole of the present invention;

[0042] Figure 15 It is a schematic structural diagram of the cooling component of the present invention.

[0043] Reference numerals: 1, chassis; 2, circulation block; 201, pressurization chamber; 202, conveying groove; 203, liquid inlet; 204, first check valve; 205, conveying hole; 206, second check valve; 207, homogenization valve; 208, liquid inlet pipe; 209, connecting pipe; 210, hopper; 3, compression motor; 301, crankshaft; 302, input shaft; 303, first gear; 304, second gear; 305, transmission belt; 306, connecting rod; 307, guide rod; 308, piston; 4, discharge hole; 401, third check valve; 402, air chamber; 403, air cylinder; 404, fourth check valve; 405, first joint; 406, plug; 407, connecting rod; 408, chute; 409, sliding rod; 410, second joint; 5, motor; 501, plugging piece; 6, hydraulic rod; 601, lifting plate; 602, oil barrel; 603, positioning rod; 604, oil pipe; 605, first electric control valve; 7, recycling box; 701, exhaust port; 702, third joint; 703, first vibrating rod; 704, discharge pipe; 705, second electric control valve; 706, liquid level gauge; 8, evaporator; 801, fourth joint; 802, fifth joint; 9, second vibrating rod; 901, third electric control valve. Detailed implementation manners

[0044] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1, as Figures 1 to 4 and Figures 10 to 13 shown, the present invention provides an extraction device for microalgae oil, including a chassis 1. A splitting component is installed inside the chassis 1. The splitting component includes a piston compression mechanism and a homogenization mechanism. The piston compression mechanism increases the pressure of the microalgae suspension and breaks the microalgae under the action of the homogenization mechanism. Microalgae high-pressure homogenization crushing is to pass the microalgae suspension through a fine homogenization valve. Under extremely high pressure, the microalgae cells are instantly subjected to strong shearing force, impact force and turbulent flow, resulting in cell rupture and release of oil. When the microalgae suspension passes through the homogenization valve, the pressure rises sharply and the cells deform under high pressure. When the microalgae suspension passes through the narrow channel of the homogenization valve, strong shearing force is generated, and these forces act on the cells, causing the rupture of the cell membrane and cell wall. When the microalgae suspension sprays out from the homogenization valve under high pressure, high-speed hydrodynamic force is generated, and these forces impact the cells, further breaking the cells (homogenization crushing is a prior art and will not be elaborated here).

[0046] Further, the homogenization mechanism includes a flow-through block 2 fixedly installed on the chassis 1. A plurality of pressurizing chambers 201 and a conveying groove 202 are provided inside the flow-through block 2. An inlet 203 is provided below the pressurizing chamber 201. A first one-way valve 204 is fixedly installed inside the inlet 203. A conveying hole 205 communicating with the conveying groove 202 is provided above the pressurizing chamber 201. A second one-way valve 206 is fixedly installed inside the conveying hole 205. A homogenization valve 207 communicating with the conveying groove 202 is fixedly installed on the flow-through block 2. An inlet pipe 208 communicating with a plurality of inlets 203 is fixedly installed at the bottom of the flow-through block 2. A connecting pipe 209 is fixedly installed on the inlet pipe 208. A hopper 210 is fixedly installed on the connecting pipe 209. Place the microalgae suspension inside the hopper 210. The microalgae suspension can enter the pressurizing chamber 201 through the first one-way valve 204 and be extruded inside the pressurizing chamber 201. The extruded microalgae suspension will enter the conveying groove 202 through the second one-way valve 206, and then enter the homogenization valve 207 through the conveying groove 202.

[0047] Further, the piston compression mechanism includes a compression motor 3 fixedly installed in the chassis 1, a crankshaft 301 rotatably installed in the chassis 1, and an input shaft 302. A first gear 303 is fixedly installed on the crankshaft 301, a second gear 304 is fixedly installed on the input shaft 302, the second gear 304 meshes with the first gear 303, a transmission belt 305 is fixedly installed on the output shaft of the compression motor 3 and the input shaft 302. A plurality of connecting rods 306 are rotatably installed on the crankshaft 301, a plurality of guide rods 307 are slidably installed in the chassis 1, the guide rods 307 correspond to the plurality of connecting rods 306 one by one and are rotatably connected, and a piston 308 is fixedly installed on the guide rods 307. The piston 308 is slidably connected to the flow block 2 and is located inside the pressurizing chamber 201. The compression motor 3 drives the transmission belt 305 to rotate, the rotating transmission belt 305 drives the input shaft 302 to rotate, the rotating input shaft 302 drives the first gear 303 to rotate through the second gear 304, the rotating first gear 303 drives the crankshaft 301 to rotate, the rotating crankshaft 301 drives the connecting rods 306 to rotate, and the rotating connecting rods 306 can push the guide rods 307 to reciprocate, thereby driving the piston 308 to reciprocate inside the pressurizing chamber 201, so that the piston 308 squeezes the microalgae suspension inside the pressurizing chamber 201.

[0048] Among them, under the action of the first one-way valve 204 and the second one-way valve 206, when the piston 308 moves away from the inside of the pressurizing chamber 201, the pressurizing chamber 201 will be in negative pressure, so that the pressurizing chamber 201 generates suction to the outside. The second one-way valve 206 does not allow gas or liquid to enter the inside of the pressurizing chamber 201 from above, thus preventing the microalgae suspension on the upper side from being affected, and enabling the liquid below the flow block 2 to enter the inside of the pressurizing chamber 201. When the piston 308 moves towards the direction close to the pressurizing chamber 201, the first one-way valve 204 prevents the microalgae suspension from being pressed into the liquid inlet pipe 208, thereby ensuring that the microalgae suspension can continuously and stably pass through the flow block 2 (the first one-way valve 204 and the second one-way valve 206 are both prior arts and will not be elaborated here).

[0049] The working principle of this embodiment is as follows: Place the microalgae suspension inside the hopper 210. Drive the conveyor belt 305 to rotate through the compression motor 3. The rotating conveyor belt 305 will drive the crankshaft 301 to rotate. The rotating crankshaft 301 will drive the connecting rod 306 to rotate. The rotating connecting rod 306 can push the guide rod 307 to move reciprocally, and then can drive the piston 308 to move reciprocally inside the pressurization chamber 201. The reciprocating movement of the piston 308 inside the pressurization chamber 201 can suck the microalgae suspension into the pressurization chamber 201, and then be squeezed into the homogenization valve 207. When the microalgae suspension passes through the homogenization valve 207, the pressure rises sharply, and the cells deform under high pressure. When the microalgae suspension passes through the narrow channel of the homogenization valve 207, strong shear forces are generated. These forces act on the cells, resulting in the rupture of the cell membrane and cell wall. When the microalgae suspension sprays out from the homogenization valve 207 under high pressure, high-speed hydrodynamic forces are generated. These forces impact the cells, further breaking the cells, so that the oil inside the position can flow out.

[0050] Embodiment 2, as Figures 5 to 8 and Figure 14 shown, based on Embodiment 1, the extraction device of the present invention further includes a cavitation oxygen prevention component. The cavitation oxygen prevention component is installed inside the chassis 1. The cavitation oxygen prevention component includes a bubble generation assembly that discharges inert gas into the microalgae suspension under the drive of the piston compression mechanism. The bubble generation assembly includes a discharge hole 4 provided on the piston 308. A third one-way valve 401 is fixedly installed at one end of the discharge hole 4 located inside the pressurization chamber 201. An air chamber 402 communicated with the discharge hole 4 is fixedly installed on the piston 308. The air chamber 402 is fixedly connected with the guide rod 307. A plurality of air cylinders 403 are fixedly installed inside the chassis 1. The air cylinders 403 correspond to the pistons 308 one by one. A fourth one-way valve 404 and a first joint 405 are fixedly installed on the air cylinders 403. A plug 406 is slidably installed inside the air cylinder 403. A connecting rod 407 is fixedly installed on the plug 406. The connecting rod 407 penetrates through one side of the air cylinder 403 and extends to the outside of the air cylinder 403. The connecting rod 407 is slidably connected with the air cylinder 403. When the plug 406 reciprocates inside the air cylinder 403, the air cylinder 403 will generate a suction force to the outside through the fourth one-way valve 404, be able to suck gas into the air cylinder 403 through the fourth one-way valve 404, and be able to press out the gas sucked into the air cylinder 403 through the first joint 405. The pressed-out gas will enter the air chamber 402 and enter the pressurization chamber 201 through a plurality of discharge holes 4, so that the gas enters the microalgae suspension and can generate bubbles in the microalgae suspension. Under the action of the third one-way valve 401, the microalgae suspension can be prevented from entering the discharge hole 4.

[0051] Further, a plurality of sliding grooves 408 are rotatably installed in the chassis 1. Slide rods 409 are slidably installed on both sides of the sliding grooves 408. One of the slide rods 409 is rotatably connected to the connecting rod 407, and the other slide rod 409 is rotatably connected to the guiding rod 307. A second joint 410 is fixedly installed on the air chamber 402, and the second joint 410 communicates with the first joint 405. When the guiding rod 307 reciprocates, it will drive the sliding grooves 408 and the slide rods 409 to rotate synchronously in a reciprocating manner. The reciprocatingly rotating slide rods 409 can drive the plug 406 to slide reciprocatingly inside the air cylinder 403, so that gas can be injected into the microalgae suspension while compressing the microalgae suspension, and the gas injection stops when the compression stops. And through the injection of gas, on the one hand, bubbles can be generated in the microalgae suspension, and on the other hand, air pressure can be formed inside the pressurizing chamber 201, which can pressurize the microalgae suspension more stably and evenly.

[0052] Furthermore, the bubbles generated in the microalgae suspension will form cavitation bubbles during the compression process of the microalgae suspension. Cavitation bubbles are tiny bubbles formed in a fluid due to pressure changes. The formation of these bubbles is usually due to the fluid rapidly entering a low-pressure area from a high-pressure area, or being generated due to shear forces, turbulence, or other dynamic effects in a high-speed flowing fluid. The formation and disappearance of cavitation bubbles is a dynamic process, and this process is called cavitation. In hydrodynamics, the formation and disappearance of cavitation bubbles have important effects on the flow behavior and energy transfer of the fluid. In a high-pressure area, the bubbles may be in a stable state, but as the pressure decreases, the bubbles may rapidly collapse, releasing a large amount of energy. This process is called cavitation collapse, and it will generate high-speed microjets and shock waves, which can have a significant mechanical effect on the surrounding fluid or object. In high-pressure homogenization, the collapse of the bubbles helps to release the oil from the microalgae cells and improve the oil extraction rate. It helps to break the microalgae more thoroughly and evenly, facilitating the extraction of oil from the microalgae.

[0053] As Figure 13 shown, the extraction device further includes a bubble homogenization component installed on the bubble generation component to control the bubble generation frequency. The bubble homogenization component is a motor 5 fixedly installed in the air chamber 402. A blocking piece 501 is fixedly installed on the output shaft of the motor 5, and the blocking piece 501 abuts against the piston 308. By driving the blocking piece 501 to rotate at a high speed by the motor 5, the blocking piece 501 can periodically block a plurality of discharge holes 4, so that the gas entering the discharge holes 4 is not continuous, which helps to generate stable and uniformly sized bubbles in the microalgae suspension, enables the bubbles to be more evenly distributed in the microalgae suspension, can effectively prevent the accumulation of bubbles in the suspension caused by continuous injection, which affects the homogenization effect, helps the bubbles to disperse and rupture rapidly, and improves the uniformity of microalgae crushing.

[0054] As Figures 7 to 8 shown, the extraction device further includes a gas volume control component installed in the chassis 1 to control the gas volume conveyed into the microalgae suspension within the single movement cycle time of the piston compression mechanism. The gas volume control component includes a hydraulic rod 6 fixedly installed in the chassis 1. A lifting plate 601 is fixedly installed on the output shaft of the hydraulic rod 6. The lifting plate 601 is slidably connected to the chassis 1. A chute 408 is rotatably installed on the lifting plate 601. The gas volume control component further includes a positioning structure. According to different crushing requirements, the stroke size of the plug 406 can be controlled by changing the height of the lifting plate 601. When the hydraulic rod 6 drives the lifting plate 601 to rise, the distance between the rotational connection of the chute 408 and the lifting plate 601 and the rotational connection of the sliding rod 409 and the guide rod 307 will increase, while the distance between the rotational connection of the chute 408 and the lifting plate 601 and the rotational connection of the guide rod 307 and the connecting rod 407 will decrease, resulting in a decrease in the stroke of the plug 406, and further resulting in a decrease in the single intake gas volume inside the pressurized chamber 201. Conversely, when the lifting plate 601 descends, the single intake gas volume inside the pressurized chamber 201 will increase.

[0055] Furthermore, the positioning structure includes oil barrels 602 fixedly installed on the upper and lower sides at both ends of the lifting plate 601. A positioning rod 603 is slidably installed in the oil barrels 602. Oil pipes 604 are fixedly installed on the two oil barrels 602 at the same end. A first electric control valve 605 is fixedly installed on the two oil pipes 604 at the same end. The oil barrels 602, the oil pipes 604, and the first electric control valve 605 are filled with hydraulic oil. The positioning rod 603 is fixedly connected to the lifting plate 601. When the lifting plate 601 moves up and down, the first electric control valve 605 needs to be opened. At this time, the hydraulic oil can circulate inside the two oil barrels 602. When fixing the lifting plate 601, closing the first electric control valve 605 can prevent the hydraulic oil inside the two oil barrels 602 from flowing, thereby preventing the position of the lifting plate 601 from changing, and further fixing the lifting plate 601.

[0056] As Figure 12As shown in the figure, the extraction device further includes a gas recovery component installed on the homogenization mechanism for recovering the inert gas inside the broken microalgae suspension. The gas recovery component includes a recovery tank 7 fixedly installed at the outlet of the homogenization valve 207. The top of the recovery tank 7 is provided with an exhaust port 701, and a third joint 702 is fixedly installed on the exhaust port 701. A plurality of first vibrating rods 703 are fixedly installed at the bottom of the recovery tank 7, and a discharge pipe 704 communicating with the recovery tank 7 is fixedly installed. A second electric control valve 705 is fixedly installed inside the discharge pipe 704, and a liquid level gauge 706 is fixedly installed inside the recovery tank 7. An inert gas that does not react with the microalgae suspension is filled into the recovery tank 7, so that the air cylinder 403 can suck out the inert gas inside the recovery tank 7. The microalgae suspension and gas passing through the homogenization valve 207 will enter the inside of the recovery tank 7, enabling the inert gas to be recycled, thereby reducing the processing cost. The liquid level gauge 706 is used to detect the liquid level height of the microalgae suspension at this time. When the height of the microalgae suspension is higher than the height of the discharge pipe 704, the second electric control valve 705 is opened. At this time, the microalgae suspension can be discharged through the discharge pipe 704, and under the action of the microalgae suspension, the gas above the microalgae suspension is blocked to prevent the gas from being discharged through the discharge pipe 704. The first vibrating rods 703 can be started to vibrate the microalgae suspension, enabling the bubbles inside the position suspension to overflow upward, thereby preventing the gas from being discharged in the form of bubbles.

[0057] In addition, as Figure 15 shown in the figure, the extraction device further includes a cooling component installed inside the chassis 1 for cooling the inert gas. The cooling component includes an evaporator 8 and a refrigeration system connected to the evaporator 8. A cooling pipe is installed inside the evaporator 8, and a fourth joint 801 and a fifth joint 802 communicating with the cooling pipe are installed on the evaporator 8. The third joint 702 is communicated with the fourth joint 801, and the fifth joint 802 is communicated with the fourth one-way valve 404. The refrigeration system includes a compressor, an expansion valve, and a condenser. The compressor is responsible for compressing the low-pressure and low-temperature refrigerant vapor into a high-pressure and high-temperature gas to provide power for the refrigeration cycle. The expansion valve is used to adjust the flow rate of the refrigerant and reduce its pressure, so that the refrigerant becomes a low-temperature and low-pressure liquid before entering the evaporator. The evaporator 8 is the place where the refrigerant absorbs heat and evaporates, and is usually used to cool air, liquid, or other substances that need to be cooled. The condenser is the place where the refrigerant releases heat and condenses into a liquid, and is usually cooled by air or water (the refrigeration system is a prior art and will not be elaborated here, and the refrigeration system is not shown in the figure).

[0058] The gas entering the air cylinder 403 through the recovery tank 7 will pass through the evaporator 8. The gas is cooled by the evaporator 8 (the prior art is not described again here). The cooled gas can enter the inside of the pressurization chamber 201 through the air cylinder 403, so as to cool the microalgae suspension. And the gas can be in uniform contact with the microalgae suspension, so as to uniformly cool the microalgae suspension, thereby preventing the microalgae suspension from generating high heat when being extruded, avoiding the oxidation of the microalgae suspension at high heat, and thus preventing the quality of the oil from being damaged by high temperature.

[0059] As Figure 9 shown, the extraction device of this embodiment further includes a liquid inlet defoaming component installed on the homogenization mechanism to eliminate the bubbles inside the microalgae suspension. The liquid inlet defoaming component includes a second vibrating rod 9 fixedly installed in the hopper 210, and a third electric control valve 901 is fixedly installed in the connecting pipe 209. By means of the second vibrating rod 9, the microalgae suspension inside the hopper 210 can be vibrated, so that the gas inside the microalgae suspension can overflow upward, preventing the microalgae suspension entering the inside of the pressurization chamber 201 from containing air, thereby effectively reducing the oxidation reaction of the microalgae suspension and ensuring the quality of the oil.

[0060] As Figures 1 to 15 shown, in this embodiment, the bubble generation component, the bubble homogenization component and the gas recovery component form a closed internal circulation gas path through the cooling component. It can make the inert gas circulate, reducing the loss of the inert gas.

[0061] The working principle of this embodiment is as follows: An inert gas that does not react with the microalgae suspension is filled into the recovery tank 7. When the guide rod 307 moves reciprocally, it will drive the chute 408 and the slide rod 409 to rotate synchronously and reciprocally. The reciprocally rotating slide rod 409 can drive the plug 406 to slide reciprocally inside the air cylinder 403, so as to realize injecting gas into the microalgae suspension while compressing the microalgae suspension, and stopping the gas injection when the compression stops. And through the injection of the gas, on the one hand, it can make the gas generate bubbles in the microalgae suspension, and on the other hand, it can form air pressure inside the pressurization chamber 201, so as to pressurize the microalgae suspension more stably and uniformly.

[0062] When the height of the microalgae suspension is higher than the height of the discharge pipe 704, the second electric control valve 705 is opened. At this time, the microalgae suspension can be discharged through the discharge pipe 704, and under the action of the microalgae suspension, the gas above the microalgae suspension is blocked, preventing the gas from being discharged through the discharge pipe 704, and the first vibrating rod 703 can be started to vibrate the microalgae suspension, so that the bubbles inside the position suspension can overflow upward, thereby preventing the gas from being discharged in the form of bubbles. It can make the inert gas be recycled, thus reducing the processing cost.

[0063] The gas entering the air cylinder 403 through the recovery tank 7 will pass through the evaporator 8. The gas is cooled by the evaporator 8 (the prior art is not elaborated here again). The cooled gas can enter the inside of the pressurizing chamber 201 through the air cylinder 403, thereby cooling the microalgae suspension. And the gas can be in uniform contact with the microalgae suspension, so that the microalgae suspension can be cooled evenly, thereby preventing the microalgae suspension from generating high heat when being extruded, avoiding the oxidation of the microalgae suspension at high heat, and preventing the high temperature from damaging the quality of the oil.

[0064] The motor 5 drives the plugging piece 501 to rotate at a high speed, so that the plugging piece can periodically block the plurality of discharge holes 4, so that the gas entering the inside of the discharge holes 4 is not continuous, which helps to generate stable and uniformly sized bubbles in the microalgae suspension, makes the bubbles disperse more evenly in the microalgae suspension, and can effectively prevent the accumulation of bubbles in the suspension caused by continuous injection, which affects the homogenization effect, helps the rapid dispersion and rupture of the bubbles, and improves the uniformity of microalgae crushing.

[0065] According to different crushing requirements, the stroke of the plug 406 can be controlled by changing the height of the lifting plate 601, and the size of the single intake air volume inside the pressurizing chamber 201 can be adjusted.

[0066] Example 3, as Figures 1 to 15 shown, based on the above Example 1 or Example 2, the present invention proposes a method for extracting microalgae oil, which is applied to the above microalgae oil extraction device, and the method includes the following steps:

[0067] Step 1: Place the microalgae suspension inside the hopper 210 and close the third electrically controlled valve 901;

[0068] Step 2: Start the piston compression mechanism. The piston compression mechanism generates suction on the liquid inlet pipe 208 and generates a thrust on the conveying groove 202 to discharge the gas inside the liquid inlet pipe 208, avoiding the generation of bubbles when the microalgae suspension enters the liquid inlet pipe 208;

[0069] Step 3: Open the third electrically controlled valve 901. Under the action of the piston compression mechanism, the microalgae suspension enters the pressurizing chamber 201, is pressurized, and then enters the homogenization valve 207 for crushing, and finally flows into the recovery tank 7;

[0070] Step 4: Fill the recovery tank 7 with inert gas. Under the action of the piston compression mechanism, the inert gas inside the recovery tank 7 is cooled by the evaporator 8 and then enters the air cylinder 403 and is extruded into the extrusion chamber;

[0071] Step Five: The inert gas entering the interior of the pressurized chamber will form bubbles and re-enter the interior of the recovery tank 7 together with the microalgae suspension, and then repeat the cycle.

[0072] The above specific embodiments are merely several alternative embodiments of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A device for extracting microalgae oil, comprising a chassis, a splitting component installed in the chassis, the splitting component comprising a piston compression mechanism and a homogenization mechanism, the piston compression mechanism increases the pressure of the microalgae suspension and crushes the microalgae under the action of the homogenization mechanism, characterized in that: Also includes: A cavitation and oxygen prevention component, the cavitation and oxygen prevention component is installed in the chassis, and the cavitation and oxygen prevention component includes a bubble generating component for discharging an inert gas into a microalgae suspension under the drive of a piston compression mechanism, a bubble homogenizing component installed on the bubble generating component for controlling the frequency of bubble generation, a gas volume control component installed in the chassis for controlling the gas volume transported into the microalgae suspension within a single movement cycle of the piston compression mechanism, a gas recovery component installed on the homogenizing mechanism for recovering the inert gas in the crushed microalgae suspension, a cooling component installed in the chassis for cooling the inert gas, and a liquid inlet defoaming component installed on the homogenizing mechanism for eliminating bubbles in the microalgae suspension; The bubble generating component, the bubble homogenizing component and the gas recovery component form a closed internal circulation gas circuit through the cooling component; The homogenizing mechanism comprises a circulation block fixedly mounted on the chassis, wherein a plurality of pressurizing chambers and a conveying trough are arranged in the circulation block; A plurality of guide rods are slidably mounted in the chassis, and pistons are fixedly mounted on the guide rods; The bubble generating assembly comprises a discharge hole provided on the piston, a third one-way valve is fixedly installed in the discharge hole and at one end located in the pressurizing chamber, an air chamber connected to the discharge hole is fixedly installed on the piston, the air chamber is fixedly connected to the guide rod, a plurality of air cylinders are fixedly installed in the chassis, the air cylinders correspond to the pistons one by one, a fourth one-way valve and a first joint are fixedly installed on the air cylinder, a plug is slidably installed in the air cylinder, a connecting rod is fixedly installed on the plug, the connecting rod passes through one side of the air cylinder and extends to the outside of the air cylinder, and the connecting rod is slidably connected to the air cylinder; A plurality of slide grooves are rotatably installed in the chassis, and slide rods are slidably installed on both sides of the slide grooves, one of the slide rods is rotatably connected to the connecting rod, and another slide rod is rotatably connected to the guide rod, and a second joint is fixedly installed on the air chamber, and the second joint is connected to the first joint.

2. A microalgae oil extraction device according to claim 1, characterized in that: A liquid inlet is provided below the pressurizing chamber, a first one-way valve is fixedly installed in the liquid inlet, a delivery hole connected to the delivery trough is provided above the pressurizing chamber, a second one-way valve is fixedly installed in the delivery hole, a homogenizing valve connected to the delivery trough is fixedly installed on the circulation block, a liquid inlet pipe connected to the multiple liquid inlets is fixedly installed at the bottom of the circulation block, a connecting pipe is fixedly installed on the liquid inlet pipe, and a hopper is fixedly installed on the connecting pipe.

3. A microalgae oil extraction device according to claim 2, characterized in that: The piston compression mechanism includes a compression motor fixedly installed in the chassis, a crankshaft and an input shaft rotatably installed in the chassis, a first gear fixedly installed on the crankshaft, a second gear fixedly installed on the input shaft, the second gear meshes with the first gear, a transmission belt fixedly installed on the output shaft and the input shaft of the compression motor, a plurality of connecting rods rotatably installed on the crankshaft, the guide rod corresponds to the plurality of connecting rods one by one and is rotatably connected, and the piston is slidably connected to the circulation block and is located inside the pressurizing chamber.

4. A device for extracting microalgae oil according to claim 3, characterized in that: The bubble homogenization component is fixedly mounted on a motor in the air chamber, and a blocking piece is fixedly mounted on an output shaft of the motor, and the blocking piece abuts against a piston.

5. A device for extracting microalgae oil according to claim 4, characterized in that: The gas volume control assembly includes a hydraulic rod fixedly installed in the chassis, a lifting plate is fixedly installed on the output shaft of the hydraulic rod, the lifting plate is slidably connected to the chassis, the slide is rotatably installed on the lifting plate, and the gas volume control assembly also includes a positioning structure; The positioning structure includes an oil barrel fixedly installed on the upper and lower sides of both ends of the lifting plate, a positioning rod is slidably installed in the oil barrel, oil pipes are fixedly installed on the two oil barrels located at the same end, and a first electrically-controlled valve is fixedly installed on the two oil pipes located at the same end, and the oil barrel, the oil pipe and the first electrically-controlled valve are filled with hydraulic oil.

6. The device for extracting microalgae oil according to claim 5, characterized in that: The gas recovery assembly includes a recovery box fixedly installed on the outlet of the homogenization valve, an exhaust port is provided on the top of the recovery box, a third joint is fixedly installed on the exhaust port, a plurality of first vibrating rods and a discharge pipe connected to the recovery box are fixedly installed on the bottom of the recovery box, a second electrically-controlled valve is fixedly installed in the discharge pipe, and a liquid level meter is fixedly installed in the recovery box.

7. The device for extracting microalgae oil according to claim 6, characterized in that: The cooling component includes an evaporator and a refrigeration system connected to the evaporator. A cooling pipe is installed in the evaporator. A fourth joint and a fifth joint connected to the cooling pipe are installed on the evaporator. The third joint is connected to the fourth joint, and the fifth joint is connected to the fourth one-way valve.

8. The device for extracting microalgae oil according to claim 7, characterized in that: The liquid inlet and defoaming component comprises a second vibrating rod fixedly installed in the hopper, and a third electrically controlled valve is fixedly installed in the connecting pipe.

9. A method for extracting microalgae oil, applied to the microalgae oil extraction device as claimed in claim 8, the method comprising the following steps: Step 1: placing the microalgae suspension in the hopper and closing the third electronically controlled valve; Step 2: Start the piston compression mechanism, which generates suction on the liquid inlet pipe and thrust on the conveying trough to discharge the gas inside the liquid inlet pipe, thereby preventing bubbles from being generated when the microalgae suspension enters the liquid inlet pipe; Step 3: Open the third electronically controlled valve, and under the action of the piston compression mechanism, the microalgae suspension enters the pressurizing chamber and pressurizes the microalgae suspension, and then the microalgae suspension enters the homogenizing valve for crushing, and finally flows into the recovery box; Step 4: Fill the recovery box with inert gas. Under the action of the piston compression mechanism, the inert gas inside the recovery box is cooled by the evaporator and then enters the gas cylinder and is squeezed into the extrusion chamber; Step 5: The inert gas entering the pressurized chamber will form bubbles and re-enter the recovery tank along with the microalgae suspension, and then the cycle will repeat.

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