Dunaliella salina solvent extraction and concentration device and preparation process thereof

Abstract

The invention discloses a dunaliella salina solvent extraction and concentration device and a preparation process thereof, and belongs to the technical field of natural product extraction. The device comprises a tank body, a stirring mechanism, a soaking mechanism and a pressing driving system, materials are lifted and scattered through a spiral blade and a stirring blade, so that the materials make full contact with the inner wall of the tank body to improve the heating uniformity; heat in the heat preservation cavity is conducted to the material area and is matched with hot air for direct heating, the driving mechanism and the pressing mechanism are used for controlling hot air release in a linkage mode, stable injection of hot bubbles in materials is achieved, the heat efficiency is improved, the heating uniformity is improved, and therefore the concentration efficiency of dunaliella salina extraction and the product quality are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of Dunaliella salina extraction, and particularly relates to a Dunaliella salina solvent extraction and concentration device and its preparation process. Background Art

[0002] Dunaliella salina is a type of microalgae living in high-salt environments. Due to its rich natural active ingredients such as β-carotene, glycerol, and protein, it has important nutritional, medical, and health care values. To extract target components from Dunaliella salina, usually solvent extraction, concentration, and other processing steps are required. In actual operation, the concentration process is a key link affecting extraction efficiency and product quality.

[0003] Most of the existing concentration equipment uses the method of heating and stirring to evaporate the solvent under low pressure conditions to achieve the purpose of concentrating the extract. However, in this process, the common problem is that the material is heated unevenly. Especially the material at the bottom of the tank is prone to insufficient heating, resulting in low concentration efficiency and insufficient component extraction. In addition, the stirring device of some concentration equipment has a single structure and cannot effectively disperse and lift the material, causing material accumulation and affecting the overall heat exchange effect. At the same time, the heat transfer method is relatively single, and most of the heat energy is conducted through the tank wall, with low efficiency, which is not conducive to the development of large-scale continuous concentration operations. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a Dunaliella salina solvent extraction and concentration device and its preparation process, which can achieve a Dunaliella salina extraction and concentration device that can improve the uniformity of material heating, enhance the heat conduction efficiency, and improve the concentration effect, so as to solve specific problems such as uneven heating and low efficiency existing in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A Dunaliella salina solvent extraction and concentration device includes a tank body, a motor is arranged at the top of the tank body, and the output end of the motor is connected with a stirring shaft;

[0007] The stirring shaft is located inside the tank body and is used for stirring the material to be concentrated in the tank body;

[0008] A heat preservation cavity is arranged on the outer wall of the tank body;

[0009] A heat equalizing mechanism is arranged inside the tank body;

[0010] The heat equalizing mechanism is used to transfer the temperature in the heat preservation cavity to the inside of the tank body;

[0011] The heat equalizing mechanism includes a base located at the bottom inside the tank body, and heat conduction tubes are arranged equidistantly around the central axis of the tank body on the base. The heat conduction tubes are located in the heat preservation cavity, and the top ends of the heat conduction tubes extend into the tank body;

[0012] And a pressing mechanism is provided at the top end of the heat conduction tube;

[0013] The heat equalizing mechanism further includes a driving mechanism sleeved on the stirring shaft;

[0014] During the rotation of the driving mechanism, the pressing mechanism is extruded, so that the hot air in the heat conduction tube is input from the bottom of the heat conduction tube into the tank body.

[0015] Further, the base is arranged in a circular ring shape, and a through pipe is arranged through the base, and the through pipes are arranged at equal intervals around the central axis of the base.

[0016] Further, one end of the through pipe is connected with an output head;

[0017] The output head includes a positioning ring connected to the through pipe, a plug is movably connected inside the positioning ring, and a cover plate is connected to one end of the positioning ring;

[0018] When the pressing mechanism is pressed, the pressure in the heat conduction tube will increase, and the plug will move towards the cover plate under the action of the pressure, and the hot air in the heat conduction tube will pass through the positioning ring and the cover plate and enter the material to be concentrated in the tank body.

[0019] Further, a gas guiding groove is formed at one end of the positioning ring, the gas guiding groove is arranged in a funnel shape, a receiving cavity is formed at the other end of the positioning ring, and the receiving cavity is communicated with the gas guiding groove;

[0020] The plug fits on the inner wall of the gas guiding groove, and a guiding column is connected to one end of the plug, the guiding column penetrates through the gas guiding groove, and exhaust grooves are arranged at equal intervals around the central axis of the guiding column;

[0021] A spring is sleeved on the guiding column, the spring is located in the receiving cavity, and a stop disc is arranged at the other end of the guiding column;

[0022] Exhaust holes are uniformly formed through the cover plate;

[0023] When the pressure in the heat conduction tube decreases, under the elastic force of the spring, the plug is tightly attached to the inner wall of the gas guiding groove.

[0024] Further, heat conducting sheets are fixedly connected to the outer side surface of the heat conduction tube along the length direction thereof, and the heat conducting sheets are arranged at equal intervals around the central axis of the heat conduction tube.

[0025] Further, the pressing mechanism includes a fixed cavity connected to the top end of the heat conduction tube, a movable cavity is movably connected to the open end of the fixed cavity, and a elastic sheet is arranged between the movable cavity and the fixed cavity;

[0026] An even connection hole is formed through the side surface of the fixed cavity, and the heat conduction tube extends into the connection hole;

[0027] The side of the fixed cavity is fixedly connected with an air inlet pipe, and one end of the air inlet pipe is connected with an air inlet mechanism. The air inlet mechanism includes a gland, and a plug disc is arranged inside the gland.

[0028] When the movable cavity is extruded by an external force, the space between the movable cavity and the fixed cavity will be compressed.

[0029] When the external force acting on the movable cavity disappears, under the elastic force of the elastic piece, the movable cavity will be automatically reset. During the reset process of the movable cavity, air will enter the fixed cavity from the through groove.

[0030] Further, a positioning hole is penetrated through the center of the gland, and a plug connector is fixedly connected to the center of the side surface of the plug disc. The plug connector is inserted into the positioning hole.

[0031] Further, the driving mechanism includes a positioning seat sleeved on the stirring shaft. Connecting arms are arranged around the outer side of the positioning seat at equal intervals along its central axis. One end of the connecting arm is provided with a pin joint seat, and a roller is rotatably connected to the pin joint seat.

[0032] Further, stirring blades and spiral blades are arranged on the stirring shaft, and the spiral blades are located inside the stirring blades.

[0033] A process for extracting and concentrating a Dunaliella salina solvent by a Dunaliella salina solvent extraction and concentration device is characterized by including the following steps:

[0034] The first step: Put the Dunaliella salina solvent material to be concentrated into the tank body.

[0035] The second step: Start the motor to drive the stirring shaft to rotate. The stirring blades and the spiral blades on the stirring shaft cooperate to stir, disperse and lift the material in the tank body, enhance the contact between the material and the inner wall of the tank body, and thus promote uniform heating.

[0036] The third step: During the stirring process, the stirring shaft drives the driving mechanism to rotate. The driving mechanism periodically extrudes the pressing mechanism. The hot air in the heat conduction tube is discharged into the material in the tank body through the output head under the action of pressure, forming hot bubbles and heating the material.

[0037] The fourth step: Maintain a constant external temperature through the heat preservation cavity. At the same time, the heat conduction sheet and the heat conduction tube cooperate to transfer heat energy, realizing the rapid distribution and stable supply of heat during the concentration process.

[0038] The fifth step: Continuously operate until the material is concentrated to the target concentration, and then complete the entire concentration process flow.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] The present invention can effectively lift and fully disperse the bottom materials during the material stirring process by setting a stirring structure in which a spiral blade cooperates with a stirring blade; when the stirring shaft rotates, the spiral blade lifts the materials at the bottom of the tank axially upward, enabling the materials to form a circulating flow path; the stirring blade cuts, disperses, and pushes the lifted materials to the inner wall of the tank, making the materials fully contact the tank wall, enhancing the heating area and uniformity, effectively solving the problems of uneven heating of materials and easy accumulation of bottom materials in the existing concentration devices, thereby significantly improving the concentration efficiency and the stability of product quality.

[0041] Through the structure of heat conduction tubes and heat conduction fins set in the heat equalizing mechanism of the present invention, combined with the annular heating space formed by the heat preservation cavity, the heat source in the heat preservation cavity can be fully utilized to conduct wrap-around heating on the heat conduction tubes; the heat conduction fins are arranged along the length direction of the heat conduction tubes and are evenly distributed around the central axis, significantly expanding the heat conduction area and accelerating the heat conduction rate; the top end of the heat conduction tube directly sends hot air into the materials in the tank, thereby providing a bubble heating path directly reaching the materials inside on the basis of maintaining a constant external heating temperature, effectively making up for the problem of low heat efficiency caused by only conducting heat through the tank wall in the traditional method, and improving the heat energy utilization rate and heat transfer speed.

[0042] The present invention sets a pressing mechanism with an elastic recovery structure and a driving mechanism linked thereto. By using the rotation of the stirring shaft to drive the driving mechanism to rotate synchronously, the rollers on the driving mechanism periodically press the movable cavity, prompting the air in the heat conduction tube to be compressed and then discharged into the tank through the output head, realizing the stable release of hot bubbles; this structure realizes power input through mechanical extrusion, avoiding the introduction of additional power sources, with a compact structure and strong operation synchronization. At the same time, through the setting of elastic sheets and springs, automatic reset is achieved, ensuring that the gas release process is controllable and adjustable, effectively solving the problems of a single heat medium transmission path and poor control accuracy in the traditional concentration system.

[0043] The present invention adopts a multi-level sealing and diversion design in the output head structure, including the combination of structures such as a positioning ring, a gas guide groove, a receiving cavity, a guide post, and an exhaust hole, which can automatically open the hot air channel when the pressure rises and automatically reset and close after the pressure drops, forming a controllable one-way hot air flow channel; the exhaust grooves on the guide post and the exhaust holes on the cover plate cooperate to enhance the uniformity of hot air distribution, effectively preventing air return and heat loss, while improving the formation efficiency and heating accuracy of hot bubbles, thereby improving the technical problems of low hot air utilization rate and unreliable sealing in the traditional device. Description of the Drawings

[0044] Figure 1 is a schematic structural diagram of the present invention;

[0045] Figure 2 is a schematic structural diagram of the heat equalizing mechanism of the present invention;

[0046] Figure 3 Structural schematic diagram of the base of the present invention;

[0047] Figure 4 Structural schematic diagram of the output head of the present invention;

[0048] Figure 5 Structural schematic diagram of the heat conduction tube of the present invention;

[0049] Figure 6 Structural schematic diagram of the pressing mechanism of the present invention;

[0050] Figure 7 is Figure 6 Enlarged schematic diagram at position A in;

[0051] Figure 8 Structural schematic diagram of the driving mechanism of the present invention.

[0052] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0053] 1, tank body; 11, motor; 12, heat preservation cavity;

[0054] 2, stirring shaft; 21, stirring blades; 22, spiral blades;

[0055] 3, heat equalizing mechanism;

[0056] 31, base; 311, through pipe;

[0057] 32, output head;

[0058] 321, positioning ring; 3211, air guide groove; 3212, accommodating cavity;

[0059] 322, plug; 3221, guiding column; 3222, exhaust groove; 3223, retaining disc;

[0060] 323, spring; 324, cover plate; 3241, exhaust hole;

[0061] 33, heat conduction tube; 331, heat conduction sheet;

[0062] 34, pressing mechanism;

[0063] 341, fixed cavity; 3411, connecting hole; 3412, intake pipe;

[0064] 342, movable cavity; 343, elastic sheet;

[0065] 344, intake mechanism;

[0066] 3441, gland; 3442, through slot; 3443, positioning hole; 3444, plug disc; 3445, plug joint;

[0067] 35. Driving mechanism; 351. Positioning seat; 352. Connecting arm; 353. Pin joint seat; 354. Roller. Detailed implementation manners

[0068] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0069] Embodiment 1:

[0070] Refer to Figure 1-8 , a solvent extraction and concentration device for Dunaliella salina, including a tank body 1. A motor 11 is arranged at the top of the tank body 1, and the output end of the motor 11 is connected with a stirring shaft 2; the stirring shaft 2 is located inside the tank body 1 and is used for stirring the substances to be concentrated in the tank body 1; a spiral blade 22 and a stirring blade 21 are arranged on the stirring shaft 2. The spiral blade 22 is located inside the stirring blade 21 and is used for lifting the materials at the bottom of the tank body 1; the stirring blade 21 cuts and disperses the lifted materials at multiple angles, increasing the contact area between the materials and the inner wall of the tank body 1, thereby effectively promoting the uniform heating and concentration efficiency of the materials; a heat preservation cavity 12 is arranged on the outer wall of the tank body 1 and is used for controlling the temperature of the tank body 1 and preventing heat loss; a heat equalizing mechanism 3 is arranged inside the tank body 1; the heat equalizing mechanism 3 is used for transferring the heat in the heat preservation cavity 12 to the material area inside the tank body 1, enhancing the heat exchange efficiency of the materials.

[0071] The heat equalizing mechanism 3 includes a base 31 located at the inner bottom of the tank body 1. The base 31 is arranged in a circular ring structure and forms a closed support structure in contact with the inner wall of the tank body 1; a plurality of heat conducting tubes 33 are arranged on the base 31 at equal intervals around the central axis of the tank body 1. The bottom of the heat conducting tube 33 is embedded in the base 31 and extends into the heat preservation cavity 12, and is used for guiding the heat source in the heat preservation cavity 12 to circulate and delivering hot air into the heat conducting tube 33; the top end of the heat conducting tube 33 extends upward and penetrates out of the base 31 and is inserted into the tank body 1, and is used for directly releasing the heated air into the materials; a pressing mechanism 34 is arranged at the top end of the heat conducting tube 33 and is used for controlling the ejection mode and ejection frequency of the air in the heat conducting tube 33 under the driving action; the heat equalizing mechanism 3 further includes a driving mechanism 35 sleeved on the stirring shaft 2; the driving mechanism 35 rotates synchronously during the rotation of the stirring shaft 2 and generates periodic mechanical extrusion on the pressing mechanism 34, so as to generate an air pressure difference inside the heat conducting tube 33, realizing the stable release and cyclic heating of the hot air.

[0072] Refer to Figure 4, the base 31 is arranged in a circular ring shape, and a through pipe 311 is arranged through the base 31. The through pipes 311 are evenly distributed around the central axis of the base 31; one end of the through pipe 311 is communicated with the heat conduction pipe 33, and the other end is used to install an output structure to ensure that hot air is introduced from the bottom and transmitted into the tank body 1 through the structure guidance.

[0073] Refer to Figure 2-6 , an output head 32 is connected to one end of the through pipe 311; the output head 32 includes a positioning ring 321 connected to the through pipe 311. A plug 322 is movably connected inside the positioning ring 321, and a cover plate 324 is connected to one end of the positioning ring 321; under the action of the pressing mechanism 34, the pressure in the heat conduction pipe 33 increases accordingly. The plug 322 moves towards the cover plate 324 under the push of the hot air pressure, thereby opening the sealing gap. The high-temperature air in the heat conduction pipe 33 enters the tank body 1 along the path of the through pipe 311 through the internal structures of the positioning ring 321 and the cover plate 324, directly contacts the salt algae solvent material to be concentrated, forms hot bubbles, and effectively improves the heating speed of the material and the concentration reaction rate.

[0074] Refer to Figure 3-4 , a gas guiding groove 3211 is opened at one end of the positioning ring 321. The gas guiding groove 3211 is arranged in a funnel shape to converge the airflow direction released by the heat conduction pipe 33; a receiving cavity 3212 is opened at the other end of the positioning ring 321. The receiving cavity 3212 is communicated with the gas guiding groove 3211 to form a sliding chamber for the plug 322; the plug 322 fits on the inner wall of the gas guiding groove 3211. One end of the plug 322 is connected with a guiding column 3221. The guiding column 3221 penetrates through the gas guiding groove 3211 to control the moving direction and limiting precision of the plug 322; exhaust grooves 3222 are evenly opened on the outer side surface of the guiding column 3221 around its central axis. The exhaust grooves 3222 are used to disperse the hot air flow and improve the uniformity of bubble generation; a spring 323 is sleeved on the guiding column 3221. The spring 323 is arranged in the receiving cavity 3212 to push the plug 322 to return when the hot pressure disappears; a retaining disc 3223 is arranged at the other end of the guiding column 3221. The retaining disc 3223 is used to limit the pre-compression deformation amount of the spring 323 and stabilize the reset direction of the plug 322; a plurality of exhaust holes 3241 are evenly penetrated through the cover plate 324. The exhaust holes 3241 are used to release the heat conduction gas and generate dispersed heating bubbles; when the pressure in the heat conduction pipe 33 decreases, under the action of the spring 323, the plug 322 automatically adheres tightly to the inner wall of the gas guiding groove 3211 to seal the gas path and prevent air from flowing back.

[0075] Refer to Figure 5, on the outer side of the heat conduction tube 33, there is a fixed connection of heat conduction fins 331 along its length direction, and the heat conduction fins 331 are arranged at equal intervals around the central axis of the heat conduction tube 33; the heat conduction fins 331 are used to expand the contact area between the heat conduction tube 33 and the internal heat source of the heat preservation cavity 12, improve the heat energy transfer efficiency, enhance the heat conduction speed and temperature uniformity, and prevent the appearance of temperature difference zones on the surface of the heat conduction tube 33.

[0076] Refer to Figure 6-8 , the pressing mechanism 34 includes a fixed cavity 341 connected to the top end of the heat conduction tube 33, and the fixed cavity 341 is used to fix the whole set of elastic control components and provide stable support; the open end of the fixed cavity 341 is movably connected with a movable cavity 342, and the movable cavity 342 is used to perform up and down compression movement under the action of the driving mechanism 35; there is a spring piece 343 between the movable cavity 342 and the fixed cavity 341, and the spring piece 343 provides an automatic return force to drive the movable cavity 342 to reset; a coupling hole 3411 is penetrated and opened on the side of the fixed cavity 341, and the heat conduction tube 33 is arranged in the coupling hole 3411 to form a sealed heat conduction cavity with the fixed cavity 341; an air inlet pipe 3412 is fixedly connected to the side of the fixed cavity 341, and the air inlet pipe 3412 is connected to an external air inlet source to supplement air; one end of the air inlet pipe 3412 is connected with an air inlet mechanism 344, and the air inlet mechanism 344 includes a gland 3441, and a plug disk 3444 is arranged inside the gland 3441, and the plug disk 3444 controls the opening and closing of the air inlet channel through a sealing structure; when the movable cavity 342 is extruded by the external force of the roller 354, the space between the movable cavity 342 and the fixed cavity 341 will be compressed, and the air pressure in the heat conduction tube 33 will increase; after the external force on the movable cavity 342 disappears, under the action of the spring piece 343, it realizes automatic reset, and during the reset process, external air enters the fixed cavity 341 through the through groove 3442 to maintain the system pressure stability.

[0077] Refer to Figure 6-8 , a positioning hole 3443 is penetrated and opened at the center of the gland 3441, and a plug joint 3445 is fixedly connected to the center of the side of the plug disk 3444, and the plug joint 3445 is inserted into the positioning hole 3443 to position and seal the air inlet path, ensuring the tightness and stability during the air pressure change process.

[0078] Refer to Figure 6-8 , the driving mechanism 35 includes a positioning seat 351 sleeved on the stirring shaft 2, and the positioning seat 351 is arranged around the stirring shaft 2; a plurality of connecting arms 352 are arranged at equal intervals along the circumferential direction on the outer side of the positioning seat 351, and the connecting arms 352 are used to transfer the rotational power to the roller 354; one end of the connecting arm 352 is provided with a pin joint seat 353, and a roller 354 is rotatably connected to the pin joint seat 353, and the roller 354 contacts and periodically presses against the outer wall of the movable cavity 342 when the driving mechanism 35 rotates, realizing the linkage control of the pressing mechanism 34.

[0079] Refer toFigure 2 On the stirring shaft 2, stirring blades 21 and spiral blades 22 are provided. The stirring blades 21 and the spiral blades 22 are arranged in sequence along the axial direction of the stirring shaft 2. The spiral blades 22 are located inside the stirring blades 21 and are used to lift the bottom materials to flow upward; the stirring blades 21 perform radial cutting and shearing on the materials, enhancing the stirring intensity, enabling the materials to form a sufficient circulating flow path in the tank body 1, and improving the heat uniformity and extraction efficiency of the materials.

[0080] A process for extracting and concentrating Dunaliella salina solvent by a Dunaliella salina solvent extraction and concentration device is characterized by including the following steps:

[0081] The first step: Input the Dunaliella salina solvent material to be concentrated into the tank body 1.

[0082] The second step: Start the motor 11 to drive the stirring shaft 2 to rotate. The stirring blades 21 and the spiral blades 22 on the stirring shaft 2 cooperate to stir, disperse and lift the materials in the tank body 1, enhancing the contact between the materials and the inner wall of the tank body 1, thereby promoting uniform heating.

[0083] The third step: During the stirring process, the stirring shaft 2 drives the driving mechanism 35 to rotate. The driving mechanism 35 periodically presses the pressing mechanism 34. The hot air in the heat conduction tube 33 is discharged into the materials in the tank body 1 through the output head 32 under the action of pressure, forming hot bubbles and heating the materials.

[0084] The fourth step: Maintain a constant external temperature through the heat preservation cavity 12. At the same time, the heat conduction sheet 331 and the heat conduction tube 33 cooperate to transfer heat energy, realizing the rapid distribution and stable supply of heat during the concentration process.

[0085] The fifth step: Continuously operate until the materials are concentrated to the target concentration, and then complete the entire concentration process flow.

[0086] Embodiment 2: Application of the stirring structure for improving the heating uniformity of bottom materials

[0087] In this embodiment, a vertical stainless steel stirring tank of model FCR-50 is selected. The inner wall of the tank body is made of 304 food-grade stainless steel and is surface mirror-treated; the motor is a 3KW variable-frequency motor, which is matched with a stirring shaft with an internal and external combined spiral structure. The diameter of the stirring shaft is Φ40mm, and three 304 stainless steel stirring blades and four spiral blades are installed; the spiral blades are spirally wound upward and have a lifting effect. The width of the blades is 60mm, and the spacing is 120mm; the stirring blades are arranged in an obliquely cut fan shape to enhance the radial shearing force; during the stirring process, after the bottom materials are lifted by the spiral blades, the stirring blades cut, disperse and push the materials to the inner wall of the tank body, forming a circulating flow path from the bottom upward and falling back from the top; through the combined action of lifting and shearing, the materials are heated more uniformly, avoiding the problem of slow heating of the bottom materials.

[0088] Comparative case: In a traditional stirring structure without a spiral blade, the stirring blade only acts on the middle material, resulting in the bottom material standing still for a long time and low heat conduction efficiency. It takes 92 minutes to concentrate the material to the set concentration under the same test conditions, while the stirring system using the structure of this embodiment only takes 67 minutes, and the concentration efficiency is increased by about 27%.

[0089] Example 3: A heat equalizing mechanism with enhanced multi-path heat conduction

[0090] In this embodiment, a layer of annular heat preservation cavity is arranged on the outer wall of the tank body. The cavity thickness is 20 mm, and high-temperature hot oil is introduced into the cavity as the heat source medium, and the medium temperature is constantly controlled at 80 °C; an annular aluminum alloy base with a thickness of 10 mm is installed at the bottom inside the tank body. The base model is 6061-T6 and has excellent heat conduction performance; 6 stainless steel heat conduction pipes with an outer diameter of Φ12 mm and a wall thickness of 1 mm are arranged at equal intervals inside the base. The heat conduction pipes penetrate through the heat preservation cavity and extend upward into the tank body. Aluminum heat conduction sheets with a width of 8 mm and a thickness of 1 mm are embedded at the top. The heat conduction sheets are installed at equal angles along the heat conduction pipes. The heat contact area is increased through the heat conduction sheets and the heat transfer speed is accelerated; during the heating process, the hot oil heats the heat conduction pipes through the heat preservation cavity, and then the heat energy is efficiently transferred to the material through the heat conduction sheets and bubbles, realizing internal and external collaborative heat conduction.

[0091] Comparative case: In the control group where the heat conduction sheet is cancelled, when concentrating 100 L of Dunaliella salina solution under the same conditions, it takes 46 minutes for the central temperature of the material to rise to 70 °C, while the device using the structure of this embodiment only takes 31 minutes. The heat transfer speed is significantly improved, and the temperature distribution of the material is more balanced.

[0092] Example 4: A roller linkage type hot gas release control structure

[0093] In this embodiment, a spring sheet 343 is made of Φ10 mm high-carbon spring steel wire and is encapsulated in a fixed cavity made of 316 stainless steel. The diameter of the fixed cavity is Φ60 mm. The outer wall of the movable cavity is set as a concave track and is matched with the roller 354; the roller 354 is made of aluminum alloy and is installed at the end of the connecting arm, and is driven by the stirring shaft to rotate to form a periodic pressing motion; the internal chamber of the movable cavity forms a positive pressure area through compressed air, and the gas is introduced into the heat conduction pipe through the through pipe and then discharged into the material inside the tank body to form bubbles; this structure does not require additional compression equipment and relies on mechanical linkage to complete gas control, ensuring synchronous heating and bubble release during the stirring process, and effectively reducing the system complexity.

[0094] Comparative case: The structure of the traditional solenoid valve controlling the release of hot air has a response delay problem, resulting in difficulty in synchronizing the release frequency with the stirring rhythm. The hot bubbles are unstable, and the local temperature of the material rises unevenly, resulting in a decrease of about 15% in the retention rate of β-carotene in the concentrated sample; while the linkage structure in this embodiment realizes synchronous release in a pure mechanical manner, the hot bubbles are formed stably, and the retention rate of the target component is higher.

[0095] Embodiment 5: Optimization of the integrated sealing control and diversion structure of the output head

[0096] In this embodiment, the positioning ring 321 is made of polytetrafluoroethylene (PTFE), which has good heat resistance and corrosion resistance; the internal air guide groove is set in a funnel shape, with an opening diameter of 20 mm and a bottom diameter of 8 mm, which is used to guide the direction of the hot air flow and reduce the resistance; the plug 322 is formed by high-temperature silicone molding and fits precisely with the inner wall of the air guide groove; the guiding column 3221 is 40 mm long and 6 mm in diameter, and 6 exhaust grooves with a depth of 1 mm are evenly distributed on the side wall; the cover plate 324 is a stainless steel punching plate, with an exhaust hole diameter of 2 mm and 30 in number, which is used to evenly release the hot air; the spring is wound with 65Mn spring steel, and the stiffness coefficient is 1.5 N / mm, which provides precise return spring force to control the opening and closing of the plug; this structure automatically opens when the air pressure is high and automatically closes when the air pressure weakens, effectively preventing the reflux of hot air and enhancing the jet stability.

[0097] Comparative case: In a common output head without the guiding column + spring sealing structure, when the air pressure in the heat conduction tube changes, there is a problem that part of the hot air flows back to the heat preservation cavity, which is likely to cause temperature control imbalance and energy consumption increase; after adopting the structure of this embodiment, the release direction of the hot air in the device is stable, the reflux phenomenon disappears, and the temperature fluctuation range in the tank is reduced from ±4°C to ±1.2°C, and the thermal energy control performance of the system is significantly improved.

[0098] The working principle of the present invention is:

[0099] During use, the material to be concentrated is put into the tank body 1, and the stirring shaft 2 installed on the output end of the motor 11 will be driven to rotate under the drive of the motor 11. As the stirring shaft 2 rotates, the stirring blades 21 and the spiral blades 22 will stir the material in the tank body 1;

[0100] During the process of stirring the material, the spiral blade 22 will lift the material at the bottom of the tank body 1, and the stirring blade 21 will disperse the lifted material, so that the material in the tank body 1 can be fully contacted with the inner wall of the tank body 1, and then the material can be heated more evenly;

[0101] During the rotation of the stirring shaft 2, the driving mechanism 35 installed on the stirring shaft 2 will be driven to rotate synchronously. During the rotation of the driving mechanism 35, the roller 354 at one end of the connecting arm 352 will squeeze the outside of the movable cavity 342. With the squeezing of the movable cavity 342, the hot air in the heat conduction tube 33 will enter the material in the tank body 1 through the output head 32. The bubbles formed by the hot air will heat the material during the rising process, thereby effectively improving the heating efficiency of the material.

[0102] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A solvent extraction and concentration device for Dunaliella salina, characterized in that: It includes a tank body (1), at the top of the tank body (1) there is a motor (11), and the output end of the motor (11) is connected to a stirring shaft (2); The stirring shaft (2) is located inside the tank body (1) and is used for stirring the substances to be concentrated in the tank body (1); The outer wall of the tank body (1) is provided with a heat preservation cavity (12); A heat equalizing mechanism (3) is arranged inside the tank body (1); The heat equalizing mechanism (3) is used to transfer the temperature in the heat preservation cavity (12) to the inside of the tank body (1); The heat equalizing mechanism (3) includes a base (31) located at the inner bottom of the tank body (1), and heat conduction tubes (33) are equidistantly arranged around the central axis of the tank body (1) on the base (31). The heat conduction tubes (33) are located in the heat preservation cavity (12), and the top ends of the heat conduction tubes (33) extend into the tank body (1); And a pressing mechanism (34) is arranged at the top end of the heat conduction tube (33); The heat equalizing mechanism (3) further includes a driving mechanism (35) sleeved on the stirring shaft (2); During the rotation of the driving mechanism (35), the pressing mechanism (34) is extruded, so that the hot air in the heat conduction tube (33) is input into the tank body (1) from the bottom of the heat conduction tube (33).

2. The solvent extraction and concentration device for Dunaliella salina according to claim 1, wherein: The base (31) is arranged in a circular ring shape, and a through tube (311) is arranged through the base (31). The through tubes (311) are equidistantly arranged around the central axis of the base (31).

3. The solvent extraction and concentration device for Dunaliella salina according to claim 2, wherein: One end of the through tube (311) is connected to an output head (32); The output head (32) includes a positioning ring (321) connected to the through tube (311). A plug (322) is movably connected inside the positioning ring (321), and one end of the positioning ring (321) is connected to a cover plate (324); When the pressing mechanism (34) is pressed, the pressure in the heat conduction tube (33) will increase, and the plug (322) moves towards the cover plate (324) under the action of the pressure. The hot air in the heat conduction tube (33) will pass through the positioning ring (321) and the cover plate (324) and enter the materials to be concentrated in the tank body (1).

4. A Dunaliella solvent extraction and concentration device according to claim 3, wherein: One end of the positioning ring (321) is provided with a gas guiding groove (3211). The gas guiding groove (3211) is arranged in a funnel shape. The other end of the positioning ring (321) is provided with a receiving cavity (3212), and the receiving cavity (3212) is communicated with the gas guiding groove (3211); The plug (322) fits on the inner wall of the gas guiding groove (3211), and one end of the plug (322) is connected to a guiding column (3221). The guiding column (3221) penetrates through the gas guiding groove (3211), and exhaust grooves (3222) are equidistantly arranged on the outer side surface of the guiding column (3221) around its central axis; A spring (323) is sleeved on the guiding column (3221). The spring (323) is located in the receiving cavity (3212), and the other end of the guiding column (3221) is provided with a stop disc (3223); The cover plate (324) is uniformly provided with exhaust holes (3241); When the pressure in the heat conduction tube (33) decreases, under the elastic force of the spring (323), the plug (322) is tightly attached to the inner wall of the gas guiding groove (3211).

5. A Dunaliella salina solvent extraction and concentration device according to claim 1, characterized in that: On the outer side of the heat conduction tube (33), heat conduction fins (331) are fixedly connected along its length direction, and the heat conduction fins (331) are arranged at equal intervals around the central axis of the heat conduction tube (33).

6. A Dunaliella salina solvent extraction and concentration device according to claim 1, characterized in that: The pressing mechanism (34) includes a fixed cavity (341) connected to the top end of the heat conduction tube (33). A movable cavity (342) is movably connected to the open end of the fixed cavity (341), and a spring piece (343) is arranged between the movable cavity (342) and the fixed cavity (341); A coupling hole (3411) is formed through the side of the fixed cavity (341), and the heat conduction tube (33) extends into the coupling hole (3411); An air inlet pipe (3412) is fixedly connected to the side of the fixed cavity (341). One end of the air inlet pipe (3412) is connected to an air inlet mechanism (344). The air inlet mechanism (344) includes a gland (3441), and a plug disk (3444) is arranged inside the gland (3441); When an external force is applied to the movable cavity (342), the space between the movable cavity (342) and the fixed cavity (341) will be compressed; When the external force applied to the movable cavity (342) disappears, under the elastic force of the spring piece (343), the movable cavity (342) will automatically reset. During the reset process of the movable cavity (342), air will enter the fixed cavity (341) from the through groove (3442).

7. The solvent extraction and concentration device for Dunaliella salina according to claim 6, wherein: A positioning hole (3443) is formed through the center of the gland (3441). A plug connector (3445) is fixedly connected to the center of the side of the plug disk (3444), and the plug connector (3445) is inserted into the positioning hole (3443).

8. A Dunaliella salina solvent extraction and concentration device according to claim 1, characterized in that: The driving mechanism (35) includes a positioning seat (351) sleeved on the stirring shaft (2). Connecting arms (352) are arranged at equal intervals around the central axis of the positioning seat (351). One end of the connecting arm (352) is provided with a pin joint seat (353), and a roller (354) is rotatably connected to the pin joint seat (353).

9. The solvent extraction and concentration device for Dunaliella salina according to claim 1, wherein: Stirring blades (21) and spiral blades (22) are arranged on the stirring shaft (2), and the spiral blades (22) are located inside the stirring blades (21).

10. A process for extracting and concentrating Dunaliella salina solvent by using the Dunaliella salina solvent extraction and concentration device according to any one of claims 1 to 9, characterized in that, It includes the following steps: The first step: Put the salt algae solvent material to be concentrated into the tank body (1); The second step: Start the motor (11) to drive the stirring shaft (2) to rotate. The stirring blades (21) and the spiral blades (22) on the stirring shaft (2) cooperate to stir, disperse and lift the material in the tank body (1), enhancing the contact between the material and the inner wall of the tank body, so as to promote uniform heating; The third step: During the stirring process, the stirring shaft (2) drives the driving mechanism (35) to rotate. The driving mechanism (35) periodically presses the pressing mechanism (34). The hot air in the heat conduction tube (33) is discharged into the material in the tank body (1) through the output head (32) under the action of pressure, forming hot bubbles and heating the material; The fourth step: Maintain a constant external temperature through the heat preservation cavity (12). At the same time, the heat conduction fins (331) and the heat conduction tube (33) cooperate to transfer heat energy, realizing the rapid distribution and stable supply of heat during the concentration process; Step 5: Continuously operate until the material is concentrated to the target concentration, and then complete the entire concentration process flow.

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