Fish oil transesterification gas stirring reaction device
By combining reverse mechanical stirring and gas stirring, the problems of uneven material mixing and insufficient gas stirring synergy in the fish oil transesterification reactor are solved. This achieves uniform material mixing and effective contact of immobilized enzymes, thereby improving reaction efficiency and cost-effectiveness.
Patent Information
- Application Number
- CN202611533195.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-30
- Publication Date
- 2026-11-03
AI Technical Summary
In existing fish oil transesterification reactors, the single stirring method leads to uneven material mixing, insufficient synergy between gas stirring and mechanical stirring, and limited material exchange near the immobilized enzyme component.
A composite stirring method combining reverse mechanical stirring and gas stirring is adopted. The inner and outer hollow drive shafts are driven to rotate in opposite directions by the active bevel gear and the transmission bevel gear. Combined with nitrogen supply and periodic disturbance of immobilized enzyme components, uniform mixing of materials and effective contact of enzyme layers are achieved.
It improves the material mixing uniformity and nitrogen dispersion state during the fish oil transesterification reaction, enhances the contact between the immobilized enzyme and the reactants, improves the mass transfer conditions of the transesterification reaction, and reduces nitrogen consumption and operating costs.
Smart Images
Figure CN123024510A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of stirring device technology, and specifically to a fish oil transesterification gas stirring reaction device. Background Technology
[0002] The transesterification of fish oil typically requires mixing fish oil, alcohols, and catalytic reactants within a reaction apparatus. To improve the contact between the materials during the reaction, existing reaction apparatuses usually employ a stirring structure to mechanically agitate the reactants. Some apparatuses also introduce nitrogen gas into the reaction system to create gas agitation, thereby promoting mixing of the reactants.
[0003] Existing stirring structures typically employ a single stirring shaft driving the stirring blades to rotate in the same direction. During stirring, the material mainly circulates along the direction of the stirring blades, resulting in varying stirring effects on materials at different heights and radial regions. This can easily create areas of weak stirring within the reaction apparatus. Furthermore, when gas-assisted stirring is used, the gas typically enters the reaction system from a fixed position or in a single direction. The distribution of the gas within the reactants and its contact with the materials are easily affected by the stirring flow field, making it difficult to achieve a sufficiently synergistic effect with mechanical stirring.
[0004] On the other hand, when using immobilized enzymes for fish oil transesterification, the immobilized enzyme assembly needs to be placed inside the reaction apparatus. The placement of the immobilized enzyme assembly further alters the material flow space within the reaction apparatus. If the movement of the stirring structure is relatively simple, material exchange near the immobilized enzyme assembly can be easily affected, thus limiting the contact between the immobilized enzyme and the reactants.
[0005] Therefore, it is necessary to provide a new technical solution to overcome the problems of uneven material mixing in different regions of the existing fish oil transesterification reactor when using a unidirectional stirring method, as well as insufficient coordination between gas stirring and mechanical stirring. Summary of the Invention
[0006] The purpose of this invention is to provide a gas-stirred reaction apparatus for fish oil transesterification that can effectively solve the above-mentioned technical problems.
[0007] To achieve the objectives of this invention, the following technical solution is adopted: A fish oil transesterification gas-stirred reaction apparatus includes: a main body, and a gas stirring assembly disposed on the main body for gas stirring of fish oil raw materials inside the main body; the gas stirring assembly includes a motor mounting base fixedly installed at the center of the top of the main body, a stirring motor fixedly installed on the motor mounting base, and a gear protective shell fixedly installed between the motor mounting base and the main body; the gear protective shell has a mounting groove on its side wall, a bearing seat is installed in the mounting groove, and a transmission bevel gear is coaxially installed in the bearing seat; the output end of the stirring motor is driven by a driving bevel gear, the driving bevel gear is driven by the transmission bevel gear, and the transmission bevel gear is driven by a driven bevel gear, the driven bevel gear being driven by the transmission bevel gear. The bevel gears are coaxially arranged; the driving bevel gear is connected to an inner hollow drive shaft, and the driven bevel gear is connected to an outer hollow drive shaft. The inner hollow drive shaft passes through the interior of the outer hollow drive shaft, and a sealed bearing seat is coaxially arranged between the inner and outer hollow drive shafts. The inner hollow drive shaft has an air outlet that communicates with the internal air passage of the outer hollow drive shaft. A first stirring blade and a second stirring blade are installed sequentially from top to bottom on the outer hollow drive shaft. A third stirring blade and a fourth stirring blade are installed sequentially from top to bottom on the inner hollow drive shaft. An immobilized enzyme assembly is also installed between the inner and outer hollow drive shafts. The inner and outer hollow drive shafts rotate in opposite directions.
[0008] Furthermore, the immobilized enzyme assembly includes: an upper driving cavity, a mounting cavity, and a lower driving cavity arranged sequentially from top to bottom; the upper driving cavity is fixedly connected to the bottom of the outer hollow drive shaft, the lower driving cavity is fixedly connected to the inner hollow drive shaft, the mounting cavity is fixedly connected to the inner wall of the device body through a connecting structure, and a connecting bearing is connected between the mounting cavity and the inner hollow drive shaft.
[0009] Furthermore, the bottom of the upper driving cavity and the top of the lower driving cavity are respectively provided with air outlets, and spherical rubber air outlet structures are respectively installed on the air outlets; the spherical rubber air outlet structures abut against the mounting cavity; the top of the mounting cavity is provided with an upper arc-shaped air inlet groove, and the bottom of the mounting cavity is provided with a lower arc-shaped air inlet groove, the upper arc-shaped air inlet groove and the lower arc-shaped air inlet groove are staggered in vertical space; the mounting cavity can rotate relative to the upper driving cavity and the lower driving cavity, and the upper arc-shaped air inlet groove and the lower arc-shaped air inlet groove periodically communicate with or stagger with the corresponding spherical rubber air outlet structures during relative rotation; the spherical rubber air outlet structure is in an open state when it is in communication with the upper arc-shaped air inlet groove or the lower arc-shaped air inlet groove, and is in a closed state when it is staggered with the corresponding arc-shaped air inlet groove by the compression of the mounting cavity wall; A piston is slidably installed inside the mounting cavity, and several enzyme layer disturbance components are provided on the piston; when the upper arc-shaped air inlet groove is connected to the spherical rubber air outlet structure, nitrogen gas is introduced, the upper part is pressurized, and the piston moves downward; when the lower arc-shaped air inlet groove is connected to the spherical rubber air outlet structure, nitrogen gas is introduced, the lower part is pressurized, and the piston moves upward.
[0010] Furthermore, the outer hollow drive shaft is connected to the first stirring blade and the upper drive cavity respectively, so as to supply nitrogen gas to the first stirring blade and the upper drive cavity.
[0011] Furthermore, the inner hollow drive shaft is connected to the third stirring blade and the lower drive chamber respectively, so as to supply nitrogen gas to the third stirring blade and the lower drive chamber.
[0012] Furthermore, an air vent is provided at the bottom of the first stirring blade, and an air vent is provided at the top of the third stirring blade.
[0013] Furthermore, the first stirring blade bends downwards, and the third stirring blade bends upwards.
[0014] Furthermore, the blades of the second stirring blade are inclined relative to the horizontal direction.
[0015] Furthermore, the sidewalls of the upper driving cavity and the lower driving cavity are respectively provided with pressure relief holes.
[0016] Compared with the prior art, the present invention has the following beneficial effects: By setting an active bevel gear, a transmission bevel gear, and a driven bevel gear, this application enables a single stirring motor to simultaneously drive the coaxially arranged inner and outer hollow transmission shafts to rotate in opposite directions. The first, second, third, and fourth stirring blades, respectively mounted on the two hollow transmission shafts, stir the materials inside the main body of the device in different directions, causing interaction between materials in different areas and thus enhancing the mixing degree of the reactants. Simultaneously, nitrogen gas is supplied to the stirring blades via the hollow transmission shafts, allowing nitrogen to enter the reactants along with the movement of the stirring blades, forming gas stirring while mechanical stirring is performed. This improves the dispersion of nitrogen in the reactants and enhances the synergistic effect of gas stirring and mechanical stirring. Therefore, this application can form a composite stirring method combining reverse mechanical stirring and gas stirring using a single stirring motor, which is beneficial for improving the mixing uniformity of materials during the fish oil transesterification reaction. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.
[0018] Figure 1 This is a schematic diagram of the overall structure of a fish oil transesterification gas stirring reaction device according to the present invention; Figure 2 This is a schematic diagram of the structure of a gas-stirred reaction device for fish oil transesterification according to the present invention; Figure 3 This is a schematic diagram of the internal structure of a gas-stirred reaction device for fish oil transesterification according to the present invention; Figure 4 This is an internal schematic diagram of a fish oil transesterification gas stirring reaction device according to the present invention; Figure 5 This is a schematic diagram of the upper driving chamber, mounting chamber, and lower driving chamber in the immobilized enzyme assembly of a fish oil transesterification gas stirring reaction device of the present invention.
[0019] In the diagram: 1. Main body of the device; 2. Gas stirring assembly; 3. Gas recovery device; 4. Nitrogen delivery pipe; 5. Stirring motor; 6. Motor mounting base; 7. Gear protective shell; 8. Bearing housing; 9. Transmission bevel gear; 10. Driving bevel gear; 11. Driven bevel gear; 12. Inner hollow transmission shaft; 13. Outer hollow transmission shaft; 14. First stirring blade; 15. Second stirring blade; 16. Immobilized enzyme assembly; 17. Third stirring blade; 18. Fourth stirring blade; 19. Upper drive chamber; 20. Mounting chamber; 21. Piston; 22. Lower drive chamber; 23. Spherical rubber gas outlet structure; 24. Enzyme layer disturbance component; 25. Upper arc-shaped air inlet groove; 26. Lower arc-shaped air inlet groove; 27. Connecting structure; 28. Connecting bearing. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.
[0021] In the description of this invention, it should be understood that the terms "center," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. When a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component. When a component is considered to be "set on" another component, it can be directly set on the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.
[0022] like Figures 1 to 5 As shown, this invention relates to a gas-stirred reaction apparatus for fish oil transesterification, comprising: a main body 1 and a gas stirring assembly 2 disposed on the main body 1. (In conjunction with...) Figure 1 As shown, the main body 1 of the device is a vertical reaction vessel structure, which is used to contain fish oil raw materials and other reaction materials, and is equipped with an immobilized enzyme layer; the top of the main body 1 is connected to a gas recovery device 3, and a nitrogen delivery pipe 4 is provided on the main body 1. The nitrogen delivery pipe 4 is connected to the internal gas passage of the two hollow drive shafts in the gas stirring assembly 2, and is used to supply nitrogen into the device.
[0023] Combination Figure 3 and Figure 4As shown, the gas stirring assembly 2 includes a motor mounting base 6 fixedly installed at the top center of the main body 1, a stirring motor 5 fixedly installed on the motor mounting base 6, and a gear protective shell 7 fixedly installed between the motor mounting base 6 and the main body 1. The gear protective shell 7 encloses the transmission components, isolating them from the reaction environment. A mounting groove is provided on the side wall of the gear protective shell 7, and a bearing seat 8 is installed in the mounting groove. A transmission bevel gear 9 is coaxially installed in the bearing seat 8. The output end of the stirring motor 5 is driven by a driving bevel gear 10, which is connected to the transmission bevel gear 9. The transmission bevel gear 9 is driven by a driven bevel gear 11, which is coaxially arranged with the transmission bevel gear 9. The driving bevel gear 10 is connected to the inner hollow drive shaft 12, and the driven bevel gear 11 is connected to the outer hollow drive shaft 13. The inner hollow drive shaft 12 passes through the interior of the outer hollow drive shaft 13. The two shafts are coaxially arranged, and a sealed bearing seat is coaxially arranged between the inner hollow drive shaft 12 and the outer hollow drive shaft 13 to support the relative rotation of the two shafts and maintain the sealing of the air passage between the two shafts. The inner hollow drive shaft 12 is provided with an air outlet that communicates with the internal air passage of the outer hollow drive shaft 13, so that the internal air passage of the inner hollow drive shaft 12 and the internal air passage of the outer hollow drive shaft 13 are interconnected through the air outlet, and nitrogen can flow between the internal air passages of the two shafts.
[0024] After the stirring motor 5 is started, the power is divided into two outputs through the meshing transmission of the driving bevel gear 10, the transmission bevel gear 9, and the driven bevel gear 11: the driving bevel gear 10 drives the inner hollow transmission shaft 12 to rotate in the first direction, and the driven bevel gear 11 drives the outer hollow transmission shaft 13 to rotate in the second direction opposite to the first direction, thereby causing the inner hollow transmission shaft 12 and the outer hollow transmission shaft 13 to rotate in opposite directions. Figure 2 and Figure 4 As shown, the outer hollow drive shaft 13 is equipped with a first stirring blade 14 and a second stirring blade 15 sequentially from top to bottom, while the inner hollow drive shaft 12 is equipped with a third stirring blade 17 and a fourth stirring blade 18 sequentially from top to bottom. When the two shafts rotate in opposite directions, the first stirring blade 14, the second stirring blade 15, the third stirring blade 17, and the fourth stirring blade 18 form two sets of opposing stirring structures within the main body 1 of the device. One set of stirring blades pushes the material in one direction, while the other set pushes the material in the opposite direction. The material from different regions interacts at the interface between the two sets of stirring structures, which can promote the material to form a circulating flow along the inside of the main body 1 of the device. This avoids the localized weak mixing areas that are easily formed by stirring in one direction, which is beneficial to improving the uniformity of the reactant distribution within the main body 1 of the device, increasing the opportunity for the reactant to contact the immobilized enzyme layer, and improving the overall mass transfer conditions of the transesterification reaction.
[0025] Nitrogen gas enters the internal gas passages of the two hollow drive shafts via nitrogen delivery pipe 4 and is then supplied in separate paths: the outer hollow drive shaft 13 is connected to the first stirring blade 14 and the upper drive chamber 19 respectively, to supply nitrogen gas to the first stirring blade 14 and the upper drive chamber 19; the inner hollow drive shaft 12 is connected to the third stirring blade 17 and the lower drive chamber 22 respectively, to supply nitrogen gas to the third stirring blade 17 and the lower drive chamber 22. An air outlet is provided at the bottom of the first stirring blade 14 and at the top of the third stirring blade 17; the first stirring blade 14 is bent downwards, the third stirring blade 17 is bent upwards, and the blades of the second stirring blade 15 are inclined relative to the horizontal direction. Nitrogen gas is discharged into the reactants through the vent holes at the bottom of the first stirring blade 14 and the top of the third stirring blade 17, forming gas stirring while mechanically stirring. The first stirring blade 14 and the third stirring blade 17 are bent downwards and upwards respectively, which can push the materials in different directions during rotation. The inclined blades of the second stirring blade 15 push the materials radially when rotating. The vent holes change their vent positions as the stirring blades rotate, allowing nitrogen gas to enter different areas inside the main body 1 of the device, thereby improving the dispersion of nitrogen gas in the reactants. At the same time, nitrogen gas forms a protective atmosphere inside the materials and above the liquid surface during the reaction, which helps to reduce the oxidation of fish oil during the transesterification process.
[0026] An immobilized enzyme assembly 16 is also installed between the inner hollow drive shaft 12 and the outer hollow drive shaft 13. Figure 5 As shown, the immobilized enzyme assembly 16 includes an upper driving cavity 19, a mounting cavity 20, and a lower driving cavity 22 stacked sequentially from top to bottom. The three components together form an annular disc-shaped structure fitted between two hollow drive shafts. The upper driving cavity 19 is fixedly connected to the bottom of the outer hollow drive shaft 13 and communicates with the internal air passage of the outer hollow drive shaft 13, rotating with the outer hollow drive shaft 13. The lower driving cavity 22 is fixedly connected to the inner hollow drive shaft 12 and communicates with the internal air passage of the inner hollow drive shaft 12, rotating in the opposite direction with the inner hollow drive shaft 12. The mounting cavity 20 is fixedly connected to the inner wall of the device body 1 via a connecting structure 27, keeping the mounting cavity 20 stationary relative to the device body 1. The inner hollow drive shaft 12 passes through the mounting cavity 20, and a connecting bearing 28 connects the mounting cavity 20 and the inner hollow drive shaft 12 to support the inner hollow drive shaft 12 and allow it to rotate relative to the mounting cavity 20. As a result, the upper drive cavity 19 and the lower drive cavity 22 rotate in opposite directions around the fixed mounting cavity 20, and relative rotation is formed between the mounting cavity 20 and the upper drive cavity 19, and between the mounting cavity 20 and the lower drive cavity 22.
[0027] Air vents are provided at the bottom of the upper drive cavity 19 and the top of the lower drive cavity 22, respectively. Spherical rubber air venting structures 23 are installed on the air vents, and the spherical rubber air venting structures 23 abut against the mounting cavity 20. An upper arc-shaped air inlet groove 25 is provided at the top of the mounting cavity 20, and a lower arc-shaped air inlet groove 26 is provided at the bottom of the mounting cavity 20. The upper arc-shaped air inlet groove 25 and the lower arc-shaped air inlet groove 26 are staggered in vertical space. During the rotation of the upper drive chamber 19 and the lower drive chamber 22 relative to the mounting chamber 20, the spherical rubber vent structures 23 on the two drive chambers slide along the outer surface of the mounting chamber 20. When the spherical rubber vent structure 23 rotates to coincide with the corresponding arc-shaped air inlet groove, the spherical rubber vent structure 23 is in an open state, communicating with the arc-shaped air inlet groove, and nitrogen in the corresponding drive chamber enters the mounting chamber 20 through the arc-shaped air inlet groove. When the spherical rubber vent structure 23 continues to rotate with the drive chamber until it is misaligned with the arc-shaped air inlet groove, the spherical rubber vent structure 23 is squeezed by the cavity wall of the mounting chamber 20 and is in a closed state, and nitrogen stops entering the mounting chamber 20. Thus, with the continuous counter-rotation of the upper and lower drive chambers, the upper arc-shaped air inlet groove 25 and the lower arc-shaped air inlet groove 26 are periodically connected to and misaligned with the corresponding spherical rubber vent structure 23, respectively, realizing the periodic switching of the nitrogen supply position in the mounting chamber 20.
[0028] A piston 21 is slidably installed inside the mounting cavity 20. The piston 21 divides the inner cavity of the mounting cavity 20 into an upper space and a lower space. Several enzyme layer disturbance elements 24 are provided on the piston 21. The enzyme layer disturbance elements 24 extend from the piston 21 to the outer periphery of the mounting cavity 20. The immobilized enzyme layer is arranged in a ring on the outer periphery of the mounting cavity 20. When the piston 21 reciprocates, the enzyme layer disturbance elements 24 move up and down near the immobilized enzyme layer. When the upper arc-shaped air inlet groove 25 is connected to the spherical rubber air outlet structure 23 on the upper drive chamber 19, nitrogen enters the upper space of the mounting chamber 20, pressurizing the upper part of the piston 21 and pushing the piston 21 downward. When the spherical rubber air outlet structure 23 rotates with the drive chamber to close and is offset from the upper arc-shaped air inlet groove 25, and the spherical rubber air outlet structure 23 on the lower drive chamber 22 rotates to connect with the lower arc-shaped air inlet groove 26, nitrogen enters the lower space of the mounting chamber 20, pressurizing the lower part of the piston 21 and pushing the piston 21 upward. In this way, the gas distribution position switches periodically between the upper and lower sides of the piston 21 as the drive chamber rotates. Under the alternating drive of nitrogen, the piston 21 reciprocates within the mounting chamber 20. The original continuous rotational motion is converted into the reciprocating motion of the piston 21. This conversion process does not require a separate gas distribution valve or reciprocating drive mechanism; it can be completed solely by the relative rotation between the upper and lower drive chambers and the mounting chamber 20.
[0029] When piston 21 reciprocates, enzyme layer disturbance component 24 reciprocates synchronously with piston 21, periodically approaching and moving away from the immobilized enzyme layer, forming periodic disturbances on the surface of the immobilized enzyme layer and the reaction liquid in the vicinity, so that the reaction liquid on the surface of the enzyme layer is constantly renewed, promoting the transfer of reactants to the surface of the enzyme layer and the timely removal of reaction products from the surface of the enzyme layer, thereby helping to increase the rate of fish oil transesterification reaction; mechanical stirring and enzyme layer disturbance are both powered by the same stirring motor 5, and gas supply is achieved by the internal air passage of the two hollow drive shafts, so there is no need to set up separate independent power sources for enzyme layer disturbance, and mechanical stirring, gas stirring and enzyme layer disturbance can be carried out in the same driving process.
[0030] The upper drive chamber 19 and the lower drive chamber 22 are respectively provided with pressure relief holes on their side walls to release the gas pressure in the upper drive chamber 19 and the lower drive chamber 22. This allows the upper drive chamber 19 and the lower drive chamber 22 to depressurize when they are not supplying gas to the installation chamber, thus preventing the continuous accumulation of gas. This helps the spherical rubber gas outlet structure 23 to return to the closed state and ensures the normal operation of the subsequent periodic gas distribution process.
[0031] During the reaction, nitrogen gas is discharged into the reactants from the vent holes at the bottom of the first stirring blade 14 and the top of the third stirring blade 17. After escaping from the liquid surface of the material, the nitrogen gas gathers at the top of the main body 1 of the device and is recovered by the gas recovery device 3 connected to the top of the main body 1 of the device. The recovered nitrogen gas can be recycled back into the device, which helps to reduce nitrogen consumption and lower the operating cost of the device.
[0032] During operation, driven by a single stirring motor 5, the device simultaneously performs three coordinated actions: the inner hollow drive shaft 12 and the outer hollow drive shaft 13 rotate in opposite directions, driving four sets of stirring blades to form reverse mechanical stirring within the main body 1; the two hollow drive shafts continuously supply nitrogen gas to the stirring blades and the upper and lower drive chambers, and the nitrogen gas is discharged into the reactants through the vent holes on the first stirring blade 14 and the third stirring blade 17, forming gas stirring; the upper and lower drive chambers rotate in opposite directions relative to the fixed mounting chamber 20, and through the periodic connection and offset of the spherical rubber vent structure 23 with the upper arc-shaped air inlet groove 25 and the lower arc-shaped air inlet groove 26, nitrogen gas is alternately supplied to the top and bottom of the piston 21, driving the piston 21 and the enzyme layer disturbance component 24 to reciprocate, periodically disturbing the immobilized enzyme layer. The three actions of mechanical stirring, gas stirring, and disturbance of the immobilized enzyme layer are carried out synchronously and in coordination.
[0033] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0034] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A gas-stirred reaction apparatus for fish oil transesterification, characterized in that, include: The device body (1) is mounted on the device body (1) and a gas stirring assembly (2) is used to gas stir the fish oil raw material inside the device body (1). The gas stirring assembly (2) includes a motor mounting base (6) fixedly mounted on the top center of the device body (1), a stirring motor (5) fixedly mounted on the motor mounting base (6), and a gear protective shell (7) fixedly mounted between the motor mounting base (6) and the device body (1). The side wall of the gear protective shell (7) is provided with a mounting groove, and a bearing seat (8) is installed in the mounting groove. A transmission bevel gear (9) is coaxially mounted in the bearing seat (8). The output end of the stirring motor (5) is driven by a driving bevel gear (10). The driving bevel gear (10) is driven by the transmission bevel gear (9). The transmission bevel gear (9) is driven by a driven bevel gear (11). The driven bevel gear (11) is coaxially arranged with the transmission bevel gear (9). The wheel (10) is connected to an inner hollow drive shaft (12), and the driven bevel gear (11) is connected to an outer hollow drive shaft (13). The inner hollow drive shaft (12) passes through the interior of the outer hollow drive shaft (13), and a sealed bearing seat (8) is coaxially provided between the inner hollow drive shaft (12) and the outer hollow drive shaft (13). The inner hollow drive shaft (12) is provided with an outlet that communicates with the internal air passage of the outer hollow drive shaft (13). Vents; the outer hollow drive shaft (13) is equipped with a first stirring blade (14) and a second stirring blade (15) from top to bottom; the inner hollow drive shaft (12) is equipped with a third stirring blade (17) and a fourth stirring blade (18) from top to bottom; an immobilized enzyme assembly (16) is also installed between the inner hollow drive shaft (12) and the outer hollow drive shaft (13); the inner hollow drive shaft (12) and the outer hollow drive shaft (13) rotate in opposite directions.
2. The fish oil transesterification gas-stirred reaction apparatus as described in claim 1, characterized in that, The immobilized enzyme assembly (16) includes an upper driving cavity (19), an installation cavity (20), and a lower driving cavity (22) arranged sequentially from top to bottom. The upper driving cavity (19) is fixedly connected to the bottom of the outer hollow drive shaft (13), the lower driving cavity (22) is fixedly connected to the inner hollow drive shaft (12), the installation cavity (20) is fixedly connected to the inner wall of the device body (1) through a connecting structure (27), and a connecting bearing (28) is connected between the installation cavity (20) and the inner hollow drive shaft (12).
3. The fish oil transesterification gas-stirred reaction apparatus as described in claim 2, characterized in that, The bottom of the upper driving cavity (19) and the top of the lower driving cavity (22) are respectively provided with air outlets, and spherical rubber air outlet structures (23) are respectively installed on the air outlets; the spherical rubber air outlet structures (23) abut against the mounting cavity (20); the top of the mounting cavity (20) is provided with an upper arc-shaped air inlet groove (25), and the bottom of the mounting cavity (20) is provided with a lower arc-shaped air inlet groove (26), the upper arc-shaped air inlet groove (25) and the lower arc-shaped air inlet groove (26) are staggered in vertical space; the mounting cavity (20) can rotate relative to the upper drive cavity (19) and the lower drive cavity (22). The upper arc-shaped air inlet groove (25) and the lower arc-shaped air inlet groove (26) are periodically connected or staggered with the corresponding spherical rubber air outlet structure (23) during the relative rotation. When the spherical rubber air outlet structure (23) is connected with the upper arc-shaped air inlet groove (25) or the lower arc-shaped air inlet groove (26), it is in the open state. When it is staggered with the corresponding arc-shaped air inlet groove, it is squeezed by the wall of the mounting cavity (20) and is in the closed state. A piston (21) is slidably installed in the mounting cavity (20), and a number of enzyme layer disturbance elements (24) are provided on the piston (21); when the upper arc-shaped air inlet groove (25) is connected to the spherical rubber air outlet structure (23), nitrogen gas is introduced, the upper part is pressurized, and the piston (21) moves downward; when the lower arc-shaped air inlet groove (26) is connected to the spherical rubber air outlet structure (23), nitrogen gas is introduced, the lower part is pressurized, and the piston (21) moves upward.
4. The fish oil transesterification gas-stirred reaction apparatus as described in claim 3, characterized in that, The outer hollow drive shaft (13) is connected to the first stirring blade (14) and the upper drive chamber (19) respectively, so as to supply nitrogen gas to the first stirring blade (14) and the upper drive chamber (19).
5. The fish oil transesterification gas-stirred reaction apparatus as described in claim 4, characterized in that, The inner hollow drive shaft (12) is connected to the third stirring blade (17) and the lower drive chamber (22) respectively, so as to supply nitrogen gas to the third stirring blade (17) and the lower drive chamber (22).
6. The fish oil transesterification gas-stirred reaction apparatus as described in claim 5, characterized in that, The bottom of the first stirring blade (14) is provided with an air outlet, and the top of the third stirring blade (17) is provided with an air outlet.
7. The fish oil transesterification gas-stirred reaction apparatus as described in claim 6, characterized in that, The first stirring blade (14) bends downward and the third stirring blade (17) bends upward.
8. The fish oil transesterification gas-stirred reaction apparatus as described in claim 7, characterized in that, The blades of the second stirring blade (15) are inclined relative to the horizontal direction.
9. The fish oil transesterification gas-stirred reaction apparatus as described in claim 8, characterized in that, The side walls of the upper driving cavity (19) and the lower driving cavity (22) are respectively provided with pressure relief holes.