Extraction device and extraction method of microalgae oil

Abstract

The invention relates to the technical field of microalgal oil extraction devices, in particular to a microalgal oil extraction device and an extraction method.The technical scheme includes that the microalgal oil extraction device comprises a case, a splitting component is mounted in the case and comprises a piston compression mechanism and a homogenization mechanism, and the microalgal oil extraction device further comprises a cavitation anti-oxygen component; and the cavitation anti-oxygen part is arranged in the case. The microalgae suspension liquid entering the pressurizing cavity is prevented from containing air, so that the oxidation reaction of the microalgae suspension liquid can be effectively reduced, the recycling box is filled with inert gas which does not react with the microalgae suspension liquid, gas can be injected into the microalgae suspension liquid while the microalgae suspension liquid is compressed, and the microalgae suspension liquid is compressed. And gas injection is stopped when compression is stopped, and through gas injection, on one hand, gas can generate bubbles in the microalgae suspension liquid, on the other hand, gas pressure can be formed in the pressurizing cavity, and the microalgae suspension liquid can be pressurized more stably and uniformly.

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] The microalgae oil extraction device is a device specially used to extract oil from microalgae cells, usually including a crushing device, which is used to break the microalgae cell wall and release the oil. The crushing device can be a high-pressure homogenization device, a ball mill or other mechanical crushing equipment.

[0003] In the high-pressure homogenization device, the microalgae needs to be treated with high pressure. During the high-pressure treatment process, the temperature usually rises. This is because high pressure increases the internal energy of the fluid, which causes the temperature to rise. The increase in temperature can accelerate the oxidation reaction of oils and fats, because high temperature increases the average kinetic energy of molecules, which increases the reaction rate. Since the air contains oxygen, which is a strong oxidant, it can react with unsaturated fatty acids in oils and fats, causing oil oxidation. During the high-pressure treatment process, due to the increase in pressure, oxygen is more easily dissolved in the suspension, increasing the chance of reaction with oils and fats. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the background technology and to provide a device and method for extracting microalgae oil.

[0005] On the one hand, the present invention provides 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, and also includes:

[0006] 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;

[0007] The bubble generating component, the bubble homogenizing component and the gas recovery component form a closed internal circulation gas circuit through the cooling component.

[0008] Optionally, the homogenizing mechanism includes a circulation block fixedly mounted on the chassis, a plurality of pressurizing chambers and a conveying trough are provided in the circulation block, a liquid inlet is provided below the pressurizing chamber, a first one-way valve is fixedly mounted in the liquid inlet, a conveying hole connected to the conveying trough is provided above the pressurizing chamber, a second one-way valve is fixedly mounted in the conveying hole, a homogenizing valve connected to the conveying trough is fixedly mounted on the circulation block, a liquid inlet pipe connected to the plurality of liquid inlets is fixedly mounted on the bottom of the circulation block, a connecting pipe is fixedly mounted on the liquid inlet pipe, and a hopper is fixedly mounted on the connecting pipe.

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

[0010] Optionally, the bubble generating assembly includes 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;

[0011] 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.

[0012] Optionally, the bubble homogenization component is fixedly mounted on a motor in the air chamber, a blocking piece is fixedly mounted on an output shaft of the motor, and the blocking piece abuts against the piston.

[0013] Optionally, the gas 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 slide is rotatably installed on the lifting plate, and the gas volume control component also includes a positioning structure;

[0014] 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.

[0015] Optionally, the gas recovery assembly includes a recovery box fixedly mounted on the outlet of the homogenization valve, an exhaust port being provided on the top of the recovery box, a third joint being fixedly mounted on the exhaust port, a plurality of first vibrating rods and a discharge pipe connected to the recovery box being fixedly mounted on the bottom of the recovery box, a second electrically-controlled valve being fixedly mounted in the discharge pipe, and a liquid level meter being fixedly mounted in the recovery box.

[0016] Optionally, 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.

[0017] Optionally, the liquid inlet defoaming component includes a second vibrating rod fixedly installed in the hopper, and a third electrically controlled valve is fixedly installed in the connecting pipe.

[0018] On the other hand, the present invention provides a method for extracting microalgae oil, which is applied to the above microalgae oil extraction device, and the method comprises the following steps:

[0019] Step 1: placing the microalgae suspension in the hopper and closing the third electronically controlled valve;

[0020] 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;

[0021] 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;

[0022] 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;

[0023] 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.

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

[0025] The present invention prevents the microalgae suspension from containing air when entering the pressurizing chamber by allowing the gas inside the microalgae suspension to overflow upward, thereby effectively reducing the oxidation reaction of the microalgae suspension. By filling the recovery box with an inert gas that does not react with the microalgae suspension, the microalgae suspension can be injected with gas while the microalgae suspension is being compressed, and the injection of gas is stopped when the compression is stopped. Moreover, through the injection of gas, bubbles can be generated in the microalgae suspension on the one hand, and air pressure can be formed inside the pressurizing chamber on the other hand, so that the microalgae suspension can be pressurized more stably and evenly.

[0026] Furthermore, the gas entering the gas cylinder through the recovery box will pass through the evaporator, and the gas will be cooled by the evaporator. The cooled gas can cool the microalgae suspension, and the gas can be in uniform contact with the microalgae suspension, so the microalgae suspension can be evenly cooled, thereby preventing the microalgae suspension from generating high heat when the microalgae suspension is squeezed, avoiding oxidation of the microalgae suspension under high heat, thereby preventing high temperature from damaging the quality of the oil.

[0027] Furthermore, making the gas entering the discharge hole discontinuous helps to generate stable bubbles of uniform size in the microalgae suspension, and can make the bubbles more evenly distributed in the microalgae suspension. It can effectively prevent the accumulation of bubbles in the suspension that may be caused by continuous injection and affect the homogenization effect, and help the bubbles to disperse and rupture quickly, thereby improving the uniformity of microalgae crushing under the action of cavitation bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A structural schematic diagram of the chassis of the present invention is provided;

[0029] Figure 2 It is a schematic diagram of the structure inside the chassis of the present invention;

[0030] Figure 3 The structure diagram of the piston compression mechanism of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 4 The structure diagram of the piston compression mechanism of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 5 It is a structural schematic diagram of the bubble generating assembly of the present invention;

[0033] Figure 6 It is a schematic diagram of the structure inside the gas cylinder of the present invention;

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

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

[0036] Fig. 9 The structure of the circulation block of the present invention is shown in FIG. Figure 1 ;

[0037] Fig.10 The structure of the circulation block of the present invention is shown in FIG. Figure 2 ;

[0038] Fig.11 It is a schematic diagram of the structure inside the circulation block of the present invention;

[0039] Fig.12 for Fig. 9 A partial enlarged view of the middle A;

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

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

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

[0043] Figure numerals: 1, chassis; 2, circulation block; 201, pressurizing chamber; 202, conveying trough; 203, liquid inlet; 204, first one-way valve; 205, conveying hole; 206, second one-way valve; 207, homogenizing 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 one-way valve; 402, air chamber; 403, air cylinder; 404, fourth one-way valve; 405, first joint; 406, plug; 407, connecting rod; 408, slide groove; 409, slide rod; 410, second joint; 5, motor; 501, plugging plate; 6, hydraulic rod; 601, lifting plate; 602, oil drum; 603, positioning rod; 604, oil pipe; 605, first electric-controlled valve; 7, recovery box; 701, exhaust port; 702, third joint; 703, first vibrating rod; 704, discharge pipe; 705, second electric-controlled valve; 706, liquid level meter; 8, evaporator; 801, fourth joint; 802, fifth joint; 9, second vibrating rod; 901, third electric-controlled valve. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] Embodiment 1, as Figures 1 to 4 and Figures 10 to 13 As shown, the present invention proposes a device for extracting microalgae oil, including a chassis 1, in which a splitting component is installed, and the splitting component includes a piston compression mechanism and a homogenization mechanism, and the piston compression mechanism increases the pressure of the microalgae suspension and crushes the microalgae under the action of the homogenization mechanism. Microalgae high-pressure homogenization crushing is to pass the microalgae suspension through a tiny homogenization valve, so that the microalgae cells are instantly subjected to strong shear force, impact force and turbulence under extremely high pressure, thereby causing the cells to rupture and release oil. When the microalgae suspension passes through the homogenization valve, the pressure rises sharply and the cells are deformed under high pressure. When the microalgae suspension passes through the narrow channel of the homogenization valve, a strong shear force is generated, and these forces act on the cells, causing the rupture of the cell membrane and the cell wall. When the microalgae suspension is ejected from the homogenization valve under high pressure, high-speed fluid power is generated, and these forces impact the cells, further crushing the cells (homogenization crushing is a prior art and is not described in detail here).

[0046] Furthermore, the homogenizing mechanism includes a circulation block 2 fixedly mounted on the chassis 1, wherein a plurality of pressurizing chambers 201 and a conveying trough 202 are arranged in the circulation block 2, a liquid inlet 203 is arranged below the pressurizing chamber 201, a first one-way valve 204 is fixedly mounted in the liquid inlet 203, a conveying hole 205 connected to the conveying trough 202 is arranged above the pressurizing chamber 201, a second one-way valve 206 is fixedly mounted in the conveying hole 205, a homogenizing valve 207 connected to the conveying trough 202 is fixedly mounted on the circulation block 2, a liquid inlet pipe 208 connected to the plurality of liquid inlets 203 is fixedly mounted at the bottom of the circulation block 2, a connecting pipe 209 is fixedly mounted on the liquid inlet pipe 208, and a hopper 210 is fixedly mounted on the connecting pipe 209. The microalgae suspension is placed inside the hopper 210 , and the microalgae suspension can enter the pressurizing chamber 201 through the first one-way valve 204 and be squeezed inside the pressurizing chamber 201 . The squeezed microalgae suspension will enter the conveying trough 202 through the second one-way valve 206 , and then enter the homogenizing valve 207 through the conveying trough 202 .

[0047] Furthermore, the piston compression mechanism includes a compression motor 3 fixedly installed in the chassis 1, a crankshaft 301 and an input shaft 302 rotatably installed in the chassis 1, a first gear 303 fixedly installed on the crankshaft 301, a second gear 304 fixedly installed on the input shaft 302, the second gear 304 and the first gear 303 are meshed with each other, a transmission belt 305 is fixedly installed on the output shaft and the input shaft 302 of the compression motor 3, 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, a piston 308 is fixedly installed on the guide rod 307, the piston 308 is slidably connected to the circulation block 2 and is located inside the pressurizing chamber 201. The transmission belt 305 is driven to rotate by the compression motor 3, and the rotating transmission belt 305 will drive the input shaft 302 to rotate. The rotating input shaft 302 can drive the first gear 303 to rotate through the second gear 304. The rotating first gear 303 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 reciprocate, and then drive 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 is away from the inside of the pressurizing chamber 201, the pressurizing chamber 201 will be negatively pressurized, so that the pressurizing chamber 201 generates suction to the outside, and the second one-way valve 206 does not allow gas or liquid to enter the inside of the pressurizing chamber 201 through the top, thereby preventing the microalgae suspension on the upper side from being affected, and enables the liquid under the circulation block 2 to enter the inside of the pressurizing chamber 201, and when the piston 308 moves toward 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 pass through the circulation block 2 continuously and stably (the first one-way valve 204 and the second one-way valve 206 are both existing technologies and are not described here).

[0049] The working principle of this embodiment is as follows: the microalgae suspension is placed inside the hopper 210, and the transmission belt 305 is driven to rotate by the compression motor 3, and the rotating transmission belt 305 will drive the crankshaft 301 to rotate, and the rotating crankshaft 301 will drive the connecting rod 306 to rotate, and the rotating connecting rod 306 can push the guide rod 307 to reciprocate, and then drive the piston 308 to reciprocate inside the pressurizing chamber 201, and the reciprocating movement of the piston 308 inside the pressurizing chamber 201 can suck the microalgae suspension into the pressurizing chamber 201, and then be squeezed into the homogenizing valve 207, when the microalgae suspension passes through the homogenizing valve 207, the pressure rises sharply, and the cells are deformed under high pressure. When the microalgae suspension passes through the narrow channel of the homogenizing valve 207, strong shear forces are generated, and these forces act on the cells, causing the cell membrane and cell wall to rupture. When the microalgae suspension is ejected from the homogenization valve 207 under high pressure, high-speed fluid power is generated, which impacts the cells and further breaks the cells, thereby allowing the oil inside the location to flow out.

[0050] Embodiment 2, as Figures 5 to 8 and Fig.14 As shown, based on the first embodiment, the extraction device of the present invention further includes a cavitation anti-oxidation component, which is installed in the chassis 1. The cavitation anti-oxidation component includes a bubble generating component that discharges an inert gas from the inside of the microalgae suspension under the drive of the piston compression mechanism. The bubble generating component includes a discharge hole 4 provided on the piston 308, and a third one-way valve 401 is fixedly installed in the discharge hole 4 and at one end located in the pressurizing chamber 201. The piston 308 is fixedly installed with an air chamber connected to the discharge hole 4. 402, the air chamber 402 is fixedly connected to the guide rod 307, a plurality of air cylinders 403 are fixedly installed in 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 cylinder 403, a plug 406 is slidably installed in the air cylinder 403, a connecting rod 407 is fixedly installed on the plug 406, the connecting rod 407 passes through one side of the air cylinder 403 and extends to the outside of the air cylinder 403, and the connecting rod 407 is slidably connected to the air cylinder 403. When the plug 406 reciprocates inside the gas cylinder 403, the gas cylinder 403 will generate suction to the outside through the fourth one-way valve 404, so that the gas can be sucked into the gas cylinder 403 through the fourth one-way valve 404, and the gas sucked into the gas cylinder 403 can be pressed out through the first joint 405. The pressed gas will enter the air chamber 402 and enter the pressurized chamber 201 through multiple 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] Furthermore, a plurality of slide grooves 408 are rotatably installed in the chassis 1, and slide bars 409 are slidably installed on both sides of the slide grooves 408, one of which is rotatably connected to the connecting rod 407, and the other slide bar 409 is rotatably connected to the guide rod 307. A second joint 410 is fixedly installed on the air chamber 402, and the second joint 410 is connected to the first joint 405. When the guide rod 307 reciprocates, the slide groove 408 and the slide bar 409 will be driven to reciprocate synchronously, and the reciprocating slide bar 409 can drive the plug 406 to slide reciprocally inside the gas cylinder 403, so that the microalgae suspension can be compressed while injecting gas into the microalgae suspension, and the gas injection can be stopped when the compression is stopped. Through the injection of gas, on the one hand, the gas can generate bubbles in the microalgae suspension, and on the other hand, air pressure can be formed inside the pressurizing chamber 201, so that the microalgae suspension can be pressurized more stably and evenly.

[0052] Furthermore, the bubbles generated in the microalgae suspension will form cavitation bubbles as the microalgae suspension is compressed. Cavitation bubbles are tiny bubbles formed in a fluid due to pressure changes. The formation of these bubbles is usually caused by the rapid entry of the fluid from a high-pressure area into a low-pressure area, or by shear force, turbulence or other dynamic effects in a high-speed flowing fluid. The formation and disappearance of cavitation bubbles is a dynamic process, which is called cavitation. In fluid dynamics, the formation and disappearance of cavitation bubbles have an important influence on the flow behavior and energy transfer of the fluid. In a high-pressure area, the bubble may be in a stable state, but as the pressure decreases, the bubble may collapse rapidly, releasing a large amount of energy. This process is called cavitation collapse, which produces high-speed microjets and shock waves, which can have significant mechanical effects on the surrounding fluid or objects. In high-pressure homogenization, the collapse of bubbles helps to release oil from microalgae cells and improve the oil extraction rate. It helps to make the microalgae more thoroughly and evenly broken, facilitating the extraction of oil from the microalgae.

[0053] like Fig.13 As shown, the extraction device also includes a bubble homogenizing component installed on the bubble generating component to control the frequency of bubble generation. The bubble homogenizing component is fixedly installed on the motor 5 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. The blocking piece 501 is driven by the motor 5 to rotate at a high speed, so that the blocking piece can periodically block the multiple discharge holes 4, so that the gas entering the discharge hole 4 is not continuous, which is helpful to generate stable bubbles of uniform size in the microalgae suspension, and can make the bubbles more uniform in the microalgae suspension. It can effectively prevent the accumulation of bubbles in the suspension caused by continuous injection, which affects the homogenization effect, and helps to quickly disperse and rupture the bubbles, thereby improving the uniformity of microalgae crushing.

[0054] like Figures 7 and 8 As shown, the extraction device also includes an air volume control component installed in the chassis 1 to control the amount of air transported into the microalgae suspension within a single movement cycle of the piston compression mechanism. The air volume control component includes a hydraulic rod 6 fixedly installed in the chassis 1, and 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, and the slide 408 is rotatably installed on the lifting plate 601. The air volume control component also includes a positioning structure. According to different crushing requirements, the stroke 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 rotation connection of the slide groove 408 and the lifting plate 601 and the rotation connection of the slide rod 409 and the guide rod 307 will increase, while the distance between the rotation connection of the slide groove 408 and the lifting plate 601 and the rotation connection of the guide rod 307 and the connecting rod 407 will decrease, thereby reducing the stroke of the plug 406, and further reducing the single air intake volume inside the pressurized chamber 201. Conversely, when the lifting plate 601 descends, the single air intake volume inside the pressurized chamber 201 will increase.

[0055] Furthermore, the positioning structure includes an oil barrel 602 fixedly mounted on both upper and lower sides of the two ends of the lifting plate 601, a positioning rod 603 is slidably mounted in the oil barrel 602, an oil pipe 604 is fixedly mounted on the two oil barrels 602 at the same end, a first electric-controlled valve 605 is fixedly mounted on the two oil pipes 604 at the same end, and the oil barrel 602, the oil pipe 604 and the first electric-controlled valve 605 are filled with hydraulic oil. The positioning rod 603 is fixedly connected to the lifting plate 601. When the lifting plate 601 is lifted, the first electric-controlled valve 605 needs to be opened, and the hydraulic oil can circulate inside the two oil barrels 602 at this time. When the lifting plate 601 is fixed, the first electric-controlled valve 605 can be closed to prevent the hydraulic oil inside the two oil barrels 602 from flowing, thereby preventing the position of the lifting plate 601 from changing, and then fixing the lifting plate 601.

[0056] like Fig.12As shown, the extraction device also includes a gas recovery component installed on the homogenization mechanism for recovering the inert gas inside the crushed microalgae suspension, the gas recovery component includes a recovery box 7 fixedly installed on the outlet of the homogenization valve 207, the top of the recovery box 7 is provided with an exhaust port 701, the exhaust port 701 is fixedly installed with a third joint 702, the bottom of the recovery box 7 is fixedly installed with a plurality of first vibrating rods 703 and a discharge pipe 704 connected to the recovery box 7, a second electrically-controlled valve 705 is fixedly installed in the discharge pipe 704, and a liquid level meter 706 is fixedly installed in the recovery box 7. The recovery box 7 is filled with an inert gas that does not react with the microalgae suspension, so that the gas cylinder 403 can suck out the inert gas inside the recovery box 7, and the microalgae suspension and gas passing through the homogenization valve 207 will enter the recovery box 7, so that the inert gas can be recycled, thereby reducing the processing cost, and the liquid level of the microalgae suspension at this time is detected by the liquid level meter 706. 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 the gas above the microalgae suspension is blocked under the action of the microalgae suspension to prevent 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 suspension can overflow upward, thereby preventing the gas from being discharged in the form of bubbles.

[0057] In addition, Fig.15 As shown, the extraction device also includes a cooling assembly installed in the chassis 1 to cool the inert gas, the cooling assembly includes an evaporator 8 and a refrigeration system connected to the evaporator 8, a cooling pipe is installed in the evaporator 8, and a fourth joint 801 and a fifth joint 802 connected to the cooling pipe are installed on the evaporator 8, the third joint 702 is connected to the fourth joint 801, and the fifth joint 802 is connected to 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, low-temperature refrigerant vapor into a high-pressure, 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, low-pressure liquid before entering the evaporator. The evaporator 8 is 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 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 described here, and the refrigeration system is not drawn in the figure).

[0058] The gas entering the gas cylinder 403 through the recovery box 7 will pass through the evaporator 8, and the gas will be cooled by the evaporator 8 (the existing technology will not be repeated again). The cooled gas can enter the pressurized chamber 201 through the gas cylinder 403, so that the microalgae suspension can be cooled. The gas can be in uniform contact with the microalgae suspension, so the microalgae suspension can be cooled uniformly, thereby preventing the microalgae suspension from generating high heat when the microalgae suspension is squeezed, avoiding oxidation of the microalgae suspension under high heat, thereby preventing high temperature from damaging the quality of the oil.

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

[0060] like Figures 1 to 15 As shown, in this embodiment, the bubble generating assembly, the bubble homogenizing assembly and the gas recovery assembly form a closed internal circulation gas path through the cooling assembly, so that the inert gas can circulate and flow, 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 box 7. When the guide rod 307 moves back and forth, it will drive the slide groove 408 and the slide rod 409 to rotate back and forth synchronously. The reciprocating slide rod 409 can drive the plug 406 to slide back and forth inside the gas cylinder 403, so that the microalgae suspension can be compressed while the gas is injected into the microalgae suspension, and the gas injection is stopped when the compression is stopped. Through the injection of gas, on the one hand, the gas can generate bubbles in the microalgae suspension, and on the other hand, air pressure can be formed inside the pressurizing chamber 201, so that the microalgae suspension can be pressurized more stably and evenly.

[0062] When the height of the microalgae suspension is higher than the height of the discharge pipe 704, the second electrically controlled valve 705 is opened. At this time, the microalgae suspension can be discharged through the discharge pipe 704, and the gas above the microalgae suspension is blocked under the action of the microalgae suspension to prevent 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 suspension can overflow upward, thereby preventing the gas from being discharged in the form of bubbles. The inert gas can be recycled, thereby reducing the processing cost.

[0063] The gas entering the gas cylinder 403 through the recovery box 7 will pass through the evaporator 8, and the gas will be cooled by the evaporator 8 (the existing technology will not be repeated again). The cooled gas can enter the pressurized chamber 201 through the gas cylinder 403, so that the microalgae suspension can be cooled. The gas can be in uniform contact with the microalgae suspension, so the microalgae suspension can be cooled uniformly, thereby preventing the microalgae suspension from generating high heat when the microalgae suspension is squeezed, avoiding oxidation of the microalgae suspension under high heat, thereby preventing high temperature from damaging the quality of the oil.

[0064] By driving the sealing piece 501 to rotate at a high speed through the motor 5, the sealing piece can periodically block the multiple discharge holes 4, so that the gas entering the discharge hole 4 is not continuous, which helps to generate stable bubbles of uniform size in the microalgae suspension, and can make the bubbles more evenly distributed in the microalgae suspension. It can effectively prevent the accumulation of bubbles in the suspension that may be caused by continuous injection and affect the homogenization effect, and help to quickly disperse and rupture the bubbles, thereby improving 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 single air intake volume inside the pressurizing chamber 201 can be adjusted.

[0066] Embodiment three, as Figures 1 to 15 As shown, based on the above-mentioned embodiment 1 or embodiment 2, the present invention proposes a method for extracting microalgae oil, which is applied to the above-mentioned microalgae oil extraction device, and the method comprises the following steps:

[0067] Step 1: placing the microalgae suspension in the hopper 210 and closing the third electronically controlled valve 901;

[0068] Step 2: Start the piston compression mechanism to generate suction force on the liquid inlet pipe 208 and thrust force on the conveying trough 202 through the piston compression mechanism to discharge the gas inside the liquid inlet pipe 208 to avoid bubbles when the microalgae suspension enters the liquid inlet pipe 208;

[0069] Step 3: Open the third electrically controlled valve 901, and under the action of the piston compression mechanism, the microalgae suspension enters the pressure chamber 201 and pressurizes the microalgae suspension, and then the microalgae suspension enters the homogenization valve 207 for crushing, and finally flows into the recovery box 7;

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

[0071] Step 5: The inert gas entering the pressurized chamber will form bubbles and re-enter the recovery tank 7 along with the microalgae suspension, and then the cycle is repeated.

[0072] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations 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 (1), wherein a splitting component is installed in the chassis (1), wherein the splitting component comprises a piston compression mechanism and a homogenization mechanism, wherein the piston compression mechanism increases the pressure of the microalgae suspension and crushes the microalgae under the action of the homogenization mechanism, wherein: Also includes: A cavitation and oxygen prevention component, the cavitation and oxygen prevention component is installed in the chassis (1), and the cavitation and oxygen prevention component includes a bubble generating component that discharges inert gas into the microalgae suspension under the drive of the piston compression mechanism, a bubble homogenizing component installed on the bubble generating component to control the bubble generation frequency, a gas volume control component installed in the chassis (1) to control 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 to recover the inert gas in the microalgae suspension after crushing, a cooling component installed in the chassis (1) to cool the inert gas, and a liquid inlet defoaming component installed on the homogenizing mechanism to eliminate 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.

2. A microalgae oil extraction device according to claim 1, characterized in that: The homogenizing mechanism comprises a circulation block (2) fixedly mounted on the chassis (1), wherein a plurality of pressurizing chambers (201) and a conveying trough (202) are arranged in the circulation block (2), a liquid inlet (203) is arranged below the pressurizing chamber (201), a first non-return valve (204) is fixedly mounted in the liquid inlet (203), a conveying hole (205) communicating with the conveying trough (202) is arranged above the pressurizing chamber (201), a second non-return valve (206) is fixedly mounted in the conveying hole (205), a homogenizing valve (207) communicating with the conveying trough (202) is fixedly mounted on the circulation block (2), a liquid inlet pipe (208) communicating with the plurality of liquid inlets (203) is fixedly mounted at the bottom of the circulation block (2), a connecting pipe (209) is fixedly mounted on the liquid inlet pipe (208), and a hopper (210) is fixedly mounted on the connecting pipe (209).

3. A microalgae oil extraction device according to claim 2, characterized in that: The piston compression mechanism comprises a compression motor (3) fixedly mounted in a casing (1), a crankshaft (301) and an input shaft (302) rotatably mounted in the casing (1); a first gear (303) is fixedly mounted on the crankshaft (301); a second gear (304) is fixedly mounted on the input shaft (302); the second gear (304) and the first gear (303) are meshed with each other; a transmission belt (305) is fixedly mounted on the output shaft and the input shaft (302) of the compression motor (3); a plurality of connecting rods (306) are rotatably mounted on the crankshaft (301); a plurality of guide rods (307) are slidably mounted in the casing (1); the guide rods (307) correspond to the plurality of connecting rods (306) one by one and are rotatably connected; a piston (308) is fixedly mounted on the guide rod (307); the piston (308) is slidably connected to the circulation block (2) and is located inside the pressurizing chamber (201).

4. A device for extracting microalgae oil according to claim 3, characterized in that: The bubble generating assembly comprises a discharge hole (4) provided on a piston (308); a third one-way valve (401) is fixedly installed in one end of the discharge hole (4) and located in the pressurizing chamber (201); an air chamber (402) connected to the discharge hole (4) is fixedly installed on the piston (308); the air chamber (402) is fixedly connected to the guide rod (307); a plurality of air cylinders (403) are fixedly installed in the chassis (1); the air cylinders (403) are connected to the pressure chamber (201); The pistons (308) correspond one to one, a fourth one-way valve (404) and a first joint (405) are fixedly installed on the gas cylinder (403), a plug (406) is slidably installed in the gas cylinder (403), a connecting rod (407) is fixedly installed on the plug (406), the connecting rod (407) passes through one side of the gas cylinder (403) and extends to the outside of the gas cylinder (403), and the connecting rod (407) is slidably connected to the gas cylinder (403); A plurality of slide grooves (408) are rotatably installed in the chassis (1), and slide rods (409) are slidably installed on both sides of the slide grooves (408), one of the slide rods (409) is rotatably connected to the connecting rod (407), and another slide rod (409) is rotatably connected to the guide rod (307), and a second joint (410) is fixedly installed on the air chamber (402), and the second joint (410) is connected to the first joint (405).

5. A device for extracting microalgae oil according to claim 4, characterized in that: The bubble homogenization component is fixedly mounted on a motor (5) in the air chamber (402), and a blocking piece (501) is fixedly mounted on the output shaft of the motor (5), and the blocking piece (501) abuts against the piston (308).

6. The device for extracting microalgae oil according to claim 5, characterized in that: The gas volume control component comprises a hydraulic rod (6) fixedly mounted in the chassis (1); a lifting plate (601) is fixedly mounted on the output shaft of the hydraulic rod (6); the lifting plate (601) is slidably connected to the chassis (1); the slide groove (408) is rotatably mounted on the lifting plate (601); and the gas volume control component further comprises a positioning structure; The positioning structure comprises an oil barrel (602) fixedly mounted on both upper and lower sides of the two ends of the lifting plate (601), a positioning rod (603) being slidably mounted in the oil barrel (602), an oil pipe (604) being fixedly mounted on the two oil barrels (602) located at the same end, a first electrically controlled valve (605) being fixedly mounted on the two oil pipes (604) located at the same end, and the oil barrel (602), the oil pipe (604) and the first electrically controlled valve (605) being filled with hydraulic oil.

7. The device for extracting microalgae oil according to claim 6, characterized in that: The gas recovery component comprises a recovery box (7) fixedly mounted on the outlet of a homogenizing valve (207), an exhaust port (701) being provided at the top of the recovery box (7), a third joint (702) being fixedly mounted on the exhaust port (701), a plurality of first vibrating rods (703) and a discharge pipe (704) connected to the recovery box (7) being fixedly mounted at the bottom of the recovery box (7), a second electrically controlled valve (705) being fixedly mounted in the discharge pipe (704), and a liquid level meter (706) being fixedly mounted in the recovery box (7).

8. The device for extracting microalgae oil according to claim 7, characterized in that: The cooling assembly comprises an evaporator (8) and a refrigeration system connected to the evaporator (8); a cooling pipe is installed in the evaporator (8); a fourth joint (801) and a fifth joint (802) connected to the cooling pipe are installed on the evaporator (8); the third joint (702) is connected to the fourth joint (801); and the fifth joint (802) is connected to the fourth one-way valve (404).

9. The device for extracting microalgae oil according to claim 8, characterized in that: The liquid inlet defoaming component comprises a second vibrating rod (9) fixedly installed in the hopper (210), and a third electrically controlled valve (901) is fixedly installed in the connecting pipe (209).

10. A method for extracting microalgae oil, applied to the microalgae oil extraction device according to any one of claims 1 to 9, the method comprising the following steps: Step 1: placing the microalgae suspension inside the hopper (210) and closing the third electronically controlled valve (901); Step 2: starting the piston compression mechanism, generating suction force on the liquid inlet pipe (208) and thrust force on the conveying groove (202) through the piston compression mechanism, so as to discharge the gas inside the liquid inlet pipe (208) and avoid the generation of bubbles when the microalgae suspension enters the liquid inlet pipe (208); Step 3: Open the third electrically controlled valve (901), and under the action of the piston compression mechanism, allow the microalgae suspension to enter the pressurizing chamber (201), pressurize the microalgae suspension, and then allow the microalgae suspension to enter the homogenizing valve (207) for crushing, and finally flow into the recovery box (7); Step 4: Fill the recovery box (7) with inert gas. Under the action of the piston compression mechanism, the inert gas inside the recovery box (7) is cooled by the evaporator (8) and then enters the gas cylinder (403) and is squeezed into the extrusion chamber; Step 5: The inert gas entering the pressurized chamber will form bubbles and enter the recovery box (7) again along with the microalgae suspension, and then repeat the cycle.

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