Mixing device

Abstract

The utility model provides a mixing device. The mixing device comprises a main body structure which is provided with a first accommodating cavity extending along a first direction; the stirring structure extends in the first direction, at least part of the stirring structure penetrates through the first containing cavity and can rotate around the central axis of the stirring structure relative to the first containing cavity, the part, located in the first containing cavity, of the stirring structure forms a stirring section, and a reaction space is formed between the outer wall face of the stirring section and the inner wall face of the first containing cavity; the main body structure is provided with a first feeding hole and a discharging hole which are communicated with the reaction space, the outer wall surface of the stirring section is provided with a plurality of first concave pits which are concave relative to the stirring section, and the plurality of first concave pits are arranged at intervals along a first direction. According to the technical scheme, the mixing device can solve the problem that solid and liquid cannot be fully mixed on the cross section of a horizontal reaction device when solid and liquid are mixed in the reaction device in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to mixing equipment technical field, specifically, relate to a mixing device. BACKGROUND

[0002] Continuous reaction technology has the advantages of high efficiency, safety, green environmental protection and the like, is popular in fine chemical industry and pharmaceutical chemical industry and the like, and also points out the direction for realizing some difficult process and high-risk chemical process. However, the chemical process involving solids in reaction raw materials, reaction intermediates and final products, in order to prevent the accumulation of solid matter from plugging, usually uses agitated kettle or agitated column as continuous reaction device.

[0003] However, the existing horizontal reaction device cannot realize the full mixing of solids and liquids on its cross section, and the solids will settle at the bottom of the reaction device under the action of gravity, if the solids are reaction raw materials or reaction intermediates, the solids settled at the bottom of the reaction device cannot be fully mixed and reacted with other reaction raw materials, resulting in insufficient reaction and incomplete conversion of raw materials. SUMMARY

[0004] The main purpose of the utility model is to provide a mixing device, which can solve the problem that the reaction device of the prior art cannot realize the full mixing of solids and liquids on the cross section of the horizontal reaction device during solid-liquid mixing.

[0005] In order to achieve the above purpose, the utility model provides a mixing device, which comprises: a main body structure having a first containing cavity extending in a first direction; a stirring structure extending in the first direction, at least part of the stirring structure being provided in the first containing cavity and being rotatable relative to the first containing cavity about a central axis of the stirring structure, the part of the stirring structure in the first containing cavity forming a stirring section, a reaction space being formed between an outer wall surface of the stirring section and an inner wall surface of the first containing cavity, the main body structure being provided with a first feed inlet and a discharge outlet in communication with the reaction space, the outer wall surface of the stirring section being provided with a plurality of first pits recessed relative to itself, and the plurality of first pits being arranged in the first direction at intervals.

[0006] Further, the maximum depth of the first pit is H1, the thickness of the side wall of the stirring section is H2, and H1 / H2 satisfies: 0.5≤H1 / H2≤0.7; and / or, the projection of the first pit in the thickness direction of the side wall of the stirring section is a circle or an ellipse, and when the projection of the first pit is an ellipse, the ellipticity e of the ellipse is in the range of 0.2≤e≤0.8.

[0007] Further, the stirring structure is a circular tube structure, and the plurality of first pits on the outer wall surface of the stirring section are arranged in multiple turns in the first direction and form a first spiral structure.

[0008] Further, the diameter of the stirring structure is D1, the pitch of the first spiral structure is P1, and P1 and D1 satisfy: 2D1≤P1≤4D1.

[0009] Further, the inner wall surface of the first accommodating cavity is provided with a plurality of second pits recessed relative to itself.

[0010] Further, the maximum depth of the second pit is H3, the thickness of the side wall of the main structure is H4, H3 / H4 satisfies: 0.5≤H3 / H4≤0.7; and / or, the projection of the second pit along the thickness direction of the side wall of the main structure is a circle or an ellipse, and when the projection of the second pit is an ellipse, the ellipticity e of the ellipse ranges from 0.2 to 0.8.

[0011] Further, the main structure is a circular tube structure, and the plurality of second pits on the inner wall surface of the first accommodating cavity are arranged in multiple turns along the first direction and form a second spiral structure.

[0012] Further, the diameter of the main structure is D2, the pitch of the second spiral structure is P2, and P2 and D2 satisfy: 2D2≤P2≤4D2.

[0013] Further, the stirring section has a second accommodating cavity, the second accommodating cavity forms an inner cavity of part of the stirring structure, and the stirring structure is provided with a first fluid inlet and a first fluid outlet in communication with the second accommodating cavity.

[0014] Further, the mixing device further comprises a first shell and a second shell, one end of the main structure is sealingly connected to the first shell, the other end of the main structure is sealingly connected to the second shell, the first end of the stirring structure is arranged in the inner cavity of the first shell, the second end of the stirring structure is arranged in the inner cavity of the second shell, the part of the stirring structure in the inner cavity of the first shell has a third accommodating cavity, the part of the stirring structure in the inner cavity of the second shell has a fourth accommodating cavity, the third accommodating cavity and the fourth accommodating cavity are both in communication with the second accommodating cavity, the part of the stirring structure in the inner cavity of the first shell is provided with a first fluid inlet in communication with the third accommodating cavity, the part of the stirring structure in the inner cavity of the second shell is provided with a first fluid outlet in communication with the fourth accommodating cavity, and the first shell is provided with a second inlet in communication with the inner cavity of the first shell.

[0015] Further, the second accommodating cavity is provided with a first turbulence structure, the first turbulence structure comprises a plurality of first turbulence sub-bodies and a plurality of second turbulence sub-bodies, the plurality of first turbulence sub-bodies and the plurality of second turbulence sub-bodies are alternately and spacedly arranged along the first direction, and the outer circumferential surface of each of the first turbulence sub-body and the second turbulence sub-body has a gap with the side wall of the inner cavity of the stirring section.

[0016] Further, along the second direction, a gap between the bottom end of the first turbulence sub-body and the side wall of the inner cavity of the stirring section is a first gap, a gap between the top end of the first turbulence sub-body and the side wall of the inner cavity of the stirring section is a second gap, the first gap is greater than the second gap, a gap between the bottom end of the second turbulence sub-body and the side wall of the inner cavity of the stirring section is a third gap, a gap between the top end of the second turbulence sub-body and the side wall of the inner cavity of the stirring section is a fourth gap, the third gap is less than the fourth gap, the first gap is greater than the third gap, and the second gap is less than the fourth gap, and the second direction is perpendicular to the first direction.

[0017] Further, along the first direction, the projections of the first turbulence sub-body and the second turbulence sub-body are both closed figures, and the closed figures are formed by arc segments and straight line segments.

[0018] Further, the mixing device further comprises an outer shell extending along the first direction, the main body structure is at least partially arranged in the outer shell, a gap is formed between the inner wall surface of the outer shell and the outer wall surface of the main body structure, and the second fluid inlet and the second fluid outlet are arranged on the outer shell and are in communication with the gap.

[0019] Further, the gap in the second turbulence structure comprises a plurality of third turbulence sub-bodies extending along the second direction and a plurality of fourth turbulence sub-bodies, the plurality of third turbulence sub-bodies and the plurality of fourth turbulence sub-bodies both extend along the second direction, the plurality of third turbulence sub-bodies are arranged on the outer wall surface of the main body structure in the first direction, the plurality of fourth turbulence sub-bodies are arranged on the inner wall surface of the outer shell in the second direction, each third turbulence sub-body has a gap between one end thereof facing the outer shell and the inner wall surface of the outer shell, each fourth turbulence sub-body has a gap between one end thereof facing the main body structure and the outer wall surface of the main body structure, and along the first direction, the plurality of third turbulence sub-bodies and the plurality of fourth turbulence sub-bodies are alternately and separately arranged.

[0020] Further, the third turbulence sub-bodies and the fourth turbulence sub-bodies are both circular rings.

[0021] Further, the mixing device further comprises a first discharge pipe extending along a third direction, the first discharge pipe is connected with the main body structure, the first discharge pipe is in communication with the reaction space, one end of the first discharge pipe forms a discharge port, and the third direction is perpendicular to the first direction; and / or, the mixing device further comprises a second discharge pipe extending along the third direction, one end of the second discharge pipe is connected with the main body structure and is in communication with the reaction space, and the other end of the second discharge pipe forms a discharge port, and the third direction is perpendicular to the first direction.

[0022] Further, the mixing device further comprises a driving structure, the driving structure is drivingly connected with the stirring structure; and / or, the main body structure is provided with a sampling pipe in communication with the reaction space.

[0023] The utility model discloses a technical scheme, be provided with main part structure and stirring structure, at least part stirring structure is arranged in first containing cavity and can rotate relative to the central axis of stirring structure of first containing cavity, the part of stirring structure in first containing cavity forms stirring section, and the outer wall surface of stirring section is provided with a plurality of first pits recessed relative to itself, when stirring structure rotates, can form the strong shearing action of vertical first direction and induce reactant material to form turbulent vortex, can promote solid material to break up and even suspend, prevent solid particle from concentrating in the bottom of first containing cavity because of gravity settlement, realize solid material and liquid material's full mixing, can strengthen solid-liquid system's micro - mixing and spatial distribution further. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings constituting a part of the specification of the utility model are used to provide further understanding on the utility model, and the illustrative embodiment of the utility model and the explanation thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0025] Figure 1 The structure schematic diagram of one angle of the mixing device of the embodiment of the utility model is shown,

[0026] Figure 2 The structure schematic diagram of another angle of the mixing device of the embodiment of the utility model is shown,

[0027] Figure 3 The sectional view of the mixing device of the embodiment of the utility model is shown,

[0028] Figure 4 The sectional view of the mixing device of the embodiment of the utility model is shown,

[0029] Figure 5 The sectional view of A-A in Figure 4 is shown,

[0030] Figure 6 The sectional view of B-B in Figure 4 is shown,

[0031] Figure 7 The structure schematic diagram of stirring structure is shown,

[0032] Figure 8 The sectional view of stirring structure is shown,

[0033] Figure 9 The sectional view of C-C in Figure 8 is shown,

[0034] Figure 10 The sectional view of D-D in Figure 8 is shown,

[0035] Figure 11 a cross-sectional view of the mixing device of the embodiment of the present application is shown;

[0036] Figure 12 a cross-sectional view of the mixing device of the embodiment of the present application is shown; Figure 11

[0037] Figure 13 a cross-sectional view of the mixing device of the embodiment of the present application is shown;

[0038] Figure 14 a cross-sectional view of the mixing device of the embodiment of the present application is shown; Figure 13

[0039] Figure 15 a cross-sectional view of the mixing device of the embodiment of the present application is shown;

[0040] Figure 16 a cross-sectional view of the mixing device of the embodiment of the present application is shown; Figure 15

[0041] Figure 17 a cross-sectional view of the mixing device of the embodiment of the present application is shown.

[0042] Among them, the above-mentioned drawings include the following reference signs:

[0043] 10, main body structure; 11, first containing cavity; 12, first feeding port; 13, discharge port; 14, overflow hole; 20, stirring structure; 21, stirring section; 22, first fluid inlet; 23, first fluid outlet; 30, first pit; 40, shell; 41, third fluid inlet; 42, second fluid outlet; 50, interlayer; 60, second turbulence structure; 61, third turbulence sub-body; 62, fourth turbulence sub-body; 70, first turbulence structure; 71, first turbulence sub-body; 711, optimal arc section; 712, straight line section; 72, second turbulence sub-body; 80, first discharge pipe; 90, second discharge pipe; 91, complete discharge port; 100, driving structure; 101, first shell; 102, second shell; 103, second fluid inlet; 105, driving motor; 106, coupling; 107, first pipeline; 108, second pipeline; 109, third pipeline; 110, fourth pipeline; 111, fifth pipeline; 112, sixth pipeline; 113, sampling pipe; 114, flange; 115, first sealing ring; 116, second sealing ring; 117, third sealing ring. DETAILED DESCRIPTION

[0044] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0045] For reference, Figures 1 to 17 ​​​The utility model provides a kind of mixing device, the mixing device includes: main body structure 10, with the first accommodating cavity 11 extending along first direction;Stirring structure 20, extend along first direction, at least part stirring structure 20 is arranged in the first accommodating cavity 11 and can rotate relative to the center axis of stirring structure 20 in the first accommodating cavity 11, the part of stirring structure 20 in the first accommodating cavity 11 forms stirring section 21, the outer wall surface of stirring section 21 and the inner wall surface of the first accommodating cavity 11 form reaction space, the first feed inlet 12 and discharge port 13 of reaction space communication are provided on main body structure 10, the outer wall surface of stirring section 21 is provided with a plurality of first pits 30 recessed relative to itself, and a plurality of first pits 30 are arranged along first direction interval.

[0046] In the embodiment, first direction refers to the horizontal direction in Figure 1 Reaction material is added into reaction space through the first feed inlet 12 to react.The outer wall surface of stirring section 21 is provided with a plurality of first pits 30 recessed relative to itself, when stirring structure 20 rotates, can form strong shear action perpendicular to first direction and induce reaction material to form turbulent vortex, can promote solid material crushing and uniform suspension, prevent solid particles from concentrating in the bottom of the first accommodating cavity 11 due to gravity settlement, realize the full mixing of solid material and liquid material, in turn can strengthen the micro-mixing and spatial distribution of solid-liquid system.A plurality of first pits 30 are arranged along first direction interval, can produce continuous turbulent flow during the rotation of stirring structure 20, help material transport and mixing in first direction, also promote radial mixing, ensure that material distribution on cross section is more uniform.

[0047] It should be noted that the mixing device of the application can also be used for liquid-liquid mixing and gas-liquid mixing to realize the full mixing of liquid material and liquid material and the full mixing of gas material and liquid material respectively.

[0048] In organic metal reagent preparation process, slightly excessive metal solid is added from the top of reaction device, in vertical reaction device, solid is difficult to suspend again once settling in the bottom, and with time passing, accumulated solid is more and more, even blocks reaction device discharge port, and regular cleaning of solid leads to continuous reaction interruption;Existing horizontal reaction device cannot realize the full mixing and distribution of solid and liquid on cross section, solid settles in the bottom of reaction device under the action of gravity, if solid is reaction raw material or reaction intermediate, solid settled in the bottom of reaction device cannot fully mix and react with other reaction raw material, leading to insufficient reaction and incomplete raw material conversion, if solid is byproduct or final product, solid will settle in the bottom of reaction device and accumulate, cannot collect product or regularly clean byproduct, and continuous chemical process application cannot be realized.

[0049] To solve the above problems, in one embodiment of the utility model, the maximum depth of the first pit 30 is H1, the thickness of the side wall of the stirring section 21 is H2, and H1 / H2 satisfies: 0.5≤H1 / H2≤0.7.

[0050] In the embodiment, the plurality of first pits 30 are all arranged on the side wall of the stirring section 21, and the maximum depth H1 of each first pit 30 and the thickness H2 of the side wall of the stirring section 21 satisfy: 0.5≤H1 / H2≤0.7. On the one hand, the shear force formed by the fluid at the first pit 30 during stirring can be maximized, so as to enhance the turbulence intensity, realize the sufficient mixing and distribution of the solid and the liquid on the cross section of the main structure 10, on the other hand, it can not only promote the fluid to produce more complex flow path in the reaction space, which is beneficial to improve the uniformity of solid-liquid mixing, but also can effectively reduce the risk of solid particles settling due to gravity and adhering to the wall, and on the other hand, it can increase the collision opportunity of the solid particles and the liquid, so as to improve the mass transfer efficiency between the solid and the liquid, speed up the chemical reaction rate, and improve the reaction yield.

[0051] In one embodiment of the utility model, the projection of the first pit 30 along the thickness direction of the side wall of the stirring section 21 is a circle or an ellipse, and when the projection of the first pit 30 is an ellipse, the value range of the ellipticity e of the ellipse is 0.2≤e≤0.8.

[0052] In the embodiment, the projection of the first pit 30 along the thickness direction of the side wall of the stirring section 21 is a circle, and the first pit 30 is arranged in this way, which can uniformly exert shear force in all directions, form symmetrical turbulent vortexes, and form consistent mixing effect on the cross section of the stirring section 21, reduce the local retention of the fluid, ensure that the reactant materials are uniformly distributed in space, can improve the probability of contact between the solid particles and the liquid, and thus speed up the mass transfer process.

[0053] When the projection of the first pit 30 is an ellipse instead of a circle, the asymmetric shape of the first pit 30 can produce non-uniform shear force when the stirring structure 20 rotates, which can induce the fluid to form more complex vortexes, and at the same time, the turbulence is neither too strong to cause unnecessary energy loss, nor too gentle to be ineffective in mixing.

[0054] When the reaction raw materials, reaction intermediates and final products involve solids, continuous reaction devices usually use mechanical stirring to promote mixing distribution and prevent solids from accumulating and plugging, which leads to mixing of materials with different reaction degrees (material back mixing) in the continuous reaction device, i.e. fresh high-concentration reaction materials are diluted by low-concentration materials remaining in the reaction device, so that the reaction efficiency in this state is very low, and the volume of the continuous reaction device needs to be increased to meet the capacity and conversion rate requirements, which is contrary to the essence of high efficiency and safety of continuous reaction technology. Therefore, in the prior art, multiple reaction kettles or reaction columns are designed in series, and from the overall process flow, material back mixing can be improved, and the more the number of reaction kettles or reaction columns in series, the weaker the material back mixing effect and the higher the reaction efficiency, which increases the complexity and implementation difficulty of continuous chemical process and chemical equipment, such as equipment facilities, power distribution and control, public pipelines, maintenance, safety supervision and other linear increases. And continuous reaction technology has the advantages of high efficiency, safety, green environmental protection and the like, and is favored in fine chemical and pharmaceutical industries, and also points out the direction for realizing some difficult processes and high-risk chemical processes. However, in order to prevent the accumulation and plugging of solid materials, a stirred tank or a stirred column is usually used as a continuous reaction device, which has severe back mixing and uneven distribution, resulting in low reaction efficiency.

[0055] In the prior art, there are also horizontal screw reactors to meet the solid-liquid system reaction process, which rely on the screw and wall (single screw reactor) or screw and screw (double screw reactor) to realize the mixing and flow of reaction materials, effectively solving the problem of reaction efficiency deterioration caused by material back mixing. However, the reaction system material is only in the gap between the screw and the wall, the screw and the screw, the reaction space is extremely limited, it is difficult to meet the industrial capacity demand, and the equipment processing precision requirement is high, the cost is expensive; some people install comb structure on the stirring shaft of the reaction device, or combine spiral blade, or inclined paddle, turbine paddle, etc. These design schemes can only realize the macro mixing between heterogeneous phases, which greatly restricts the macro reaction rate and the efficiency of the reaction device. In order to solve the above technical problems, in an embodiment of the utility model, the stirring structure 20 is a circular tube structure, and the plurality of first pits 30 on the outer wall surface of the stirring section 21 are arranged in multiple circles along the first direction and form a first spiral structure.

[0056] In the embodiment, the stirring structure 20 is a circular tube structure, that is, a circular ring of the cross section of the stirring structure 20, when the stirring structure 20 rotates counterclockwise, the plurality of first pits 30 on the outer wall surface of the stirring section 21 can exert a force on the reaction material in the opposite direction of the conveying direction of the reaction material, so that the reaction material can flow to the discharge end of the mixing device, the back mixing effect of the reaction material can be limited, the flow pattern tends to be a plug flow, in the reaction space, not only can the problems such as solid deposition blockage and mass transfer efficiency limiting reaction rate be avoided, but also the reaction efficiency of the continuous reaction device can be maximized.

[0057] It should be noted that due to the existence of gravity and buoyancy, the solid usually gathers in the liquid by deposition or floating, and the stirring device needs to provide a driving force in the vertical direction to realize the uniform distribution of the solid in the liquid. If the continuous reaction device is a vertical structure, the stirring effect will cause the mixing of materials with different reaction degrees (that is, material back mixing), and the reaction efficiency in this state is very low. The present application adopts a horizontal structure, when the stirring structure rotates, the plurality of first pits 30 will form a strong shearing effect, inducing the liquid material to form a turbulent vortex, promoting microscale mixing with solid materials or heterogeneous liquid materials, and the first pits 30 are spirally distributed along the first direction, which will form a rotational flow force opposite to the direction of liquid flow, effectively inhibiting material back mixing and effectively avoiding the mixing of materials with different reaction degrees, that is, fresh materials will not be mixed with reacted materials.

[0058] In an embodiment of the present application, the diameter of the stirring structure 20 is D1, the pitch of the first spiral structure is P1, and P1 and D1 satisfy: 2D1≤P1≤4D1.

[0059] Through the above setting, the breaking and dispersion of the solid material can be ensured, the mixing efficiency can be improved, the back mixing of the material along the first direction can be inhibited, the flow pattern is closer to plug flow, the separation of the newly added material and the reacted material can be maintained, the interaction between the heterogeneous materials can be enhanced, the mass transfer efficiency can be improved, and the rapid progress of the chemical reaction can be promoted.

[0060] In an embodiment of the present application, the inner wall surface of the first accommodating cavity 11 is provided with a plurality of second pits recessed with respect to itself.

[0061] Through the above setting, when the fluid flows, the second pit can make the reaction material form a turbulent vortex, further promote the crushing and uniform suspension of the solid material, and realize the full mixing of the solid material and the liquid material.

[0062] In an embodiment of the present application, the maximum depth of the second pit is H3, the thickness of the side wall of the main body structure 10 is H4, and H3 / H4 satisfies: 0.5≤H3 / H4≤0.7.

[0063] Through the above arrangement, on the one hand, the turbulence intensity and the micro-mixing efficiency of the fluid can be enhanced, on the other hand, the fluid can be caused to generate a more complex flow path in the reaction space, the uniformity of the solid-liquid mixing is beneficial to be improved, and the collision opportunity of the solid particles and the liquid can be further increased, so that the mass transfer efficiency between the solid and the liquid is improved, the chemical reaction rate is accelerated, and the reaction yield is improved.

[0064] In one embodiment of the utility model, the projection of the second pit along the thickness direction of the side wall of the main body structure 10 is a circle or an ellipse, and when the projection of the second pit is an ellipse, the value range of the ellipticity e of the ellipse is 0.2<=e<=0.8.

[0065] In the embodiment, the projection of the second pit along the thickness direction of the side wall of the stirring section 21 is a circle, and such arrangement can uniformly apply shear force in all directions to form symmetrical turbulent vortexes to form uniform mixing effect on the cross section of the stirring section 21, reduce local retention of the fluid, ensure uniform spatial distribution of the reactant, and improve the probability of contact between the solid particles and the liquid to accelerate the mass transfer process.

[0066] When the projection of the second pit is an ellipse instead of a circle, the asymmetric shape can generate uneven shear force when the stirring structure 20 rotates to induce the fluid to form more complex vortexes, and at the same time, the turbulence is neither too intense to cause unnecessary energy loss nor too mild to be ineffective in mixing.

[0067] In one embodiment of the utility model, the main body structure 10 is a circular tube structure, and the plurality of second pits on the inner wall surface of the first accommodating cavity 11 are arranged in multiple turns along the first direction and form a second spiral structure.

[0068] In the embodiment, the main body structure 10 is a circular tube structure, i.e., the circular ring of the cross section of the main body structure 10, and the plurality of second pits on the inner wall surface of the first accommodating cavity 11 are arranged in multiple turns along the first direction and form a second spiral structure, which can further inhibit backmixing of the reactant to make the flow pattern tend to be plug flow.

[0069] In one embodiment of the utility model, the value range of the rotating speed of the stirring structure 20 is 50rpm~500rpm.

[0070] In an embodiment of the utility model, the depth of the first and second pits is 3mm-7mm, the distance between two adjacent first pits 30 is 5mm-15mm along the radial direction of the stirring structure 20, the distance between two adjacent second pits is 5mm-15mm along the radial direction of the main body structure 10, and the distance between two adjacent first pits 30 and the distance between two adjacent second pits are both 10mm-15mm along the first direction. Through the above setting, the mixing effect can be ensured.

[0071] It should be noted that by increasing the depth of the first pit 30 and improving the rotation speed of the stirring structure, the turbulent vortex induced by the liquid is enhanced, and the influence area is expanded, which not only can be applied to scenes such as more viscous reaction system, larger solid density, and more easily layered heterogeneous phase, but also can ensure the consistency of mixing distribution, mass transfer reaction, heat transfer temperature control, etc. when the equipment is enlarged.

[0072] In an embodiment of the utility model, the diameter of the main body structure 10 is D2, and the pitch of the second spiral structure is P2, and P2 and D2 satisfy: 2D2≤P2≤4D2.

[0073] Through the above setting, the crushing and dispersion of solid materials can be ensured, the mixing efficiency can be improved, the back mixing of materials along the first direction can be inhibited, the flow mode is closer to plug flow, the separation of newly added materials and reaction materials that have participated in the reaction can be maintained, the interaction between heterogeneous materials can be enhanced, the mass transfer efficiency can be improved, and the rapid progress of chemical reaction can be promoted.

[0074] For reference Figures 1 to 17 In an embodiment of the utility model, the stirring section 21 has a second accommodating cavity, the second accommodating cavity forms an inner cavity of part of the stirring structure 20, and the stirring structure 20 is provided with a first fluid inlet 22 and a first fluid outlet 23 which communicate with the second accommodating cavity.

[0075] In the embodiment, the second accommodating cavity is provided, so that the coolant or heat medium can enter the inside of the stirring structure 20 through the first fluid inlet 22, and the coolant or heat medium in the second accommodating cavity can more closely contact the reaction system, so as to more quickly respond to the demand of reaction heat release or heat absorption, realize accurate temperature control, avoid the fluctuation of reaction temperature, and ensure the smooth progress of the reaction. The first fluid outlet 23 can communicate with the external collecting pipeline to realize the circulating flow of the coolant or heat medium.

[0076] For reference Figures 1 to 17As shown in the utility model, one embodiment of the utility model, the mixing device still includes first casing 101 and second casing 102, one end of main body structure 10 is sealedly connected with first casing 101, the other end of main body structure 10 is sealedly connected with second casing 102, the first end of stirring structure 20 is arranged in the inner chamber of first casing 101, the second end of stirring structure 20 is arranged in the inner chamber of second casing 102, the portion of stirring structure 20 in the inner chamber of first casing 101 has third accommodating cavity, the portion of stirring structure 20 in the inner chamber of second casing 102 has fourth accommodating cavity, third accommodating cavity and fourth accommodating cavity are all communicated with second accommodating cavity, the portion of stirring structure 20 in the inner chamber of first casing 101 is provided with first fluid inlet 22 communicated with third accommodating cavity, the portion of stirring structure 20 in the inner chamber of second casing 102 is provided with first fluid outlet 23 communicated with fourth accommodating cavity, and first casing 101 is provided with second fluid inlet 103 communicated with the inner chamber of first casing 101.

[0077] In the embodiment, the first end of stirring structure 20 is arranged in the inner chamber of first casing 101 and can rotate in the inner chamber of first casing 101, the outer wall surface of the portion of stirring structure 20 arranged in the inner chamber of first casing 101 forms annular accommodating cavity with the inner wall surface of the inner chamber of first casing 101, second fluid inlet 103 is communicated with annular accommodating cavity, and the refrigerant or heat medium can enter annular accommodating cavity through fluid second fluid inlet 103, then enter third accommodating cavity from first fluid inlet 22 through annular accommodating cavity, then enter second accommodating cavity through third accommodating cavity, and the refrigerant or heat medium in second accommodating cavity can more closely contact the reaction system, so that the demand of responding to reaction heat release or heat absorption is faster, accurate temperature control is realized, the fluctuation of reaction temperature is avoided, and the reaction is ensured to proceed stably.

[0078] In combination with Figures 1 to 17 As shown in the utility model, one embodiment of the utility model, the first disturbance structure 70 is arranged in the second accommodating cavity, and the first disturbance structure 70 includes a plurality of first disturbance sub-bodies 71 and a plurality of second disturbance sub-bodies 72, the plurality of first disturbance sub-bodies 71 and the plurality of second disturbance sub-bodies 72 are alternately and spacedly arranged along the first direction, and the outer circumferential surfaces of the first disturbance sub-bodies 71 and the second disturbance sub-bodies 72 both have gaps with the side wall of the inner chamber of the stirring section 21.

[0079] In the embodiment, the first disturbance structure 70 can destroy the laminar flow state of the fluid flowing in the second accommodating cavity through the alternately arranged first disturbance sub-bodies 71 and second disturbance sub-bodies 72, form complex turbulent flow, thereby increasing the contact time of the refrigerant or heat medium with the inner wall of the second accommodating cavity and ensuring the cooling or heating effect. Meanwhile, the alternately arranged first disturbance sub-bodies 71 and second disturbance sub-bodies 72 enable the refrigerant or heat medium to form a wave shape in the first direction when flowing through the second accommodating cavity, thereby reducing the dead zone in the fluid flow.

[0080] Through the above setting, under the action of the first and second turbulence sub-bodies 71 and 72, the heat transfer between the fluid in the second containing cavity and the stirring structure can be strengthened, the flow boundary layer can be broken, the fluid temperature uniformity can be improved, the heat transfer to the outside can be realized, and the reaction system can be efficiently controlled.

[0081] Referring to Figures 1 to 17 In an embodiment of the utility model, along the second direction, the gap between the bottom end of the first turbulence sub-body 71 and the side wall of the inner cavity of the stirring section 21 is a first gap, the gap between the top end of the first turbulence sub-body 71 and the side wall of the inner cavity of the stirring section 21 is a second gap, the first gap is greater than the second gap, the gap between the bottom end of the second turbulence sub-body 72 and the side wall of the inner cavity of the stirring section 21 is a third gap, the gap between the top end of the second turbulence sub-body 72 and the side wall of the inner cavity of the stirring section 21 is a fourth gap, the third gap is less than the fourth gap, the first gap is greater than the third gap, the second gap is less than the fourth gap, and the second direction is perpendicular to the first direction.

[0082] In the embodiment, the second direction refers to the vertical direction in Figure 4 The fluid flowing through the second gap and the third gap can form an annular flow, in the adjacent first and second turbulence sub-bodies 71 and 72, the fluid flowing through the first gap, the region between the first turbulence sub-body 71 and the second turbulence sub-body 72, and the fourth gap forms a jet flow, the jet flow strengthens the heat transfer between the fluid and the stirring structure 20, the annular flow is used to purge the flow dead zone caused by the jet flow, the periodic flow and mixing between the two can break the flow boundary layer, improve the fluid temperature uniformity, and realize efficient temperature control of the reaction system.

[0083] Referring to Figures 1 to 17 In an embodiment of the utility model, the projection along the first direction is a closed figure, and the closed figure is surrounded by an arc segment 711 and a straight line segment 712.

[0084] Through the above setting, the size of the reaction space can be ensured, the fluid can be smoothly transitioned, the resistance of the fluid bypassing the turbulence sub-body can be reduced, and the energy consumption can be reduced.

[0085] Referring to Figures 1 to 17 In an embodiment of the utility model, the mixing device further comprises an outer shell 40 extending along the first direction, and the main body structure 10 is at least partially arranged in the outer shell 40, a gap 50 is formed between the inner wall surface of the outer shell 40 and the outer wall surface of the main body structure 10, and the outer shell 40 is provided with a third fluid inlet 41 and a second fluid outlet 42 in communication with the gap 50.

[0086] In the embodiment, the interlayer 50 is arranged to allow the external coolant or heat medium to flow through, so as to realize heat exchange with the outer wall surface of the main body structure 10, and for the exothermic reaction, the excess heat can be carried away more effectively, and for the endothermic reaction, the sufficient heat compensation can be provided to stabilize the reaction temperature.

[0087] In one embodiment, the stirring section 21 has a second containing cavity which forms the inner cavity of the partial stirring structure 20, and the stirring structure 20 is provided with the first fluid inlet 22 and the first fluid outlet 23 which are in communication with the second containing cavity; the mixing device further comprises the shell 40 which extends along the first direction, and the main body structure 10 is at least partially arranged in the shell 40, and the interlayer 50 is formed between the inner wall surface of the shell 40 and the outer wall surface of the main body structure 10, and the shell 40 is provided with the third fluid inlet 41 and the second fluid outlet 42 which are in communication with the interlayer 50.

[0088] In the embodiment, the application can obviously accelerate the chemical reaction in the reaction space by strengthening the microscale mixing and mass transfer, and the application can realize double-sided cooling or heating by the arrangement of the above-mentioned stirring section 21, so as to control the uniformity and stability of the reaction temperature, thereby avoiding the risks of thermal runaway, deterioration of materials or deterioration of selectivity. In the exothermic reaction, the coolant is introduced into the second containing cavity and the interlayer 50 to absorb heat and regulate the temperature of the reaction system; in the endothermic reaction, the heat medium is introduced into the second containing cavity and the interlayer 50 to release heat and regulate the temperature of the reaction system.

[0089] It should be noted that the first fluid inlet 22 and the third fluid inlet 41 can be connected with the external supply pipeline, and the first fluid outlet 23 and the second fluid outlet 42 are connected with the external return pipeline, so as to realize the circulation supply of the required coolant or heat medium.

[0090] For reference Figures 1 to 17 As shown in the drawings, in one embodiment of the utility model, the interlayer 50 is provided with the second turbulence structure 60, the second turbulence structure 60 includes a plurality of third turbulence sub-bodies 61 extending along the second direction and a plurality of fourth turbulence sub-bodies 62, the plurality of third turbulence sub-bodies 61 and the plurality of fourth turbulence sub-bodies 62 all extend along the second direction, the plurality of third turbulence sub-bodies 61 are arranged on the outer wall of the main body structure 10 along the first direction, the plurality of fourth turbulence sub-bodies 62 are arranged on the inner wall of the shell 40 along the second direction, the end of each third turbulence sub-body 61 towards the shell 40 has a gap with the inner wall of the shell 40, the end of each fourth turbulence sub-body 62 towards the main body structure 10 has a gap with the outer wall of the main body structure 10, and along the first direction, the plurality of third turbulence sub-bodies 61 and the plurality of fourth turbulence sub-bodies 62 are alternately and spacedly arranged.

[0091] In the embodiment, the second flow disturbing structure 60 can destroy the laminar flow state of the fluid flowing through the interlayer 50 by the alternately arranged third flow disturbing part 61 and fourth flow disturbing part 62, form a complex turbulent flow, increase the contact time of the coolant or heat medium with the outer wall surface of the main structure 10, and ensure the cooling or heating effect. Meanwhile, the alternately arranged third flow disturbing part 61 and fourth flow disturbing part 62 can make the coolant or heat medium form a wave shape in the first direction when flowing through the interlayer 50, and further reduce the dead zone in the fluid flow.

[0092] Through the above arrangement, the heat transfer between the fluid and the shell 40 can be strengthened, the fluid temperature uniformity can be improved, and the heat transfer to the inside can realize efficient temperature control of the reaction system.

[0093] In an embodiment of the utility model, the third flow disturbing part 61 and fourth flow disturbing part 62 are both circular rings.

[0094] In the embodiment, the main structure 10 and shell 40 are circular pipe structures, that is, the cross sections of the main structure 10 and shell 40 are both circular rings, the third flow disturbing part 61 is a circular ring, the inner circumferential surface of the third flow disturbing part 61 is connected with the outer wall surface of the main structure 10, the fluid flow space is formed between the outer circumferential surface of the third flow disturbing part 61 and the inner wall surface of the shell 40, the fourth flow disturbing part 62 is a circular ring, the outer circumferential surface of the fourth flow disturbing part 62 is connected with the inner wall surface of the shell 40, and the fluid flow space is formed between the inner circumferential surface of the fourth flow disturbing part 62 and the outer wall surface of the main structure 10.

[0095] Through the above arrangement, the fluid in the interlayer 50 and the second containing cavity can be disturbed in the whole circumferential direction of the main structure 10 and shell 40, and further the dead zone in the fluid flow can be reduced.

[0096] Combined with the Figures 1 to 17 In an embodiment of the utility model, the mixing device further comprises a first discharge pipe 80 extending in the third direction, the first discharge pipe 80 is connected with the main structure 10, the first discharge pipe 80 is in communication with the reaction space, one end of the first discharge pipe 80 forms a discharge port 13, and the third direction is perpendicular to the first direction.

[0097] In the embodiment, the third direction refers to Figure 6The third direction is perpendicular to the first direction in the horizontal direction. The main body structure 10 is a circular tube structure, the first discharge pipe 80 is connected to and tangent to the top of the main body structure 10, and the stirring structure 20 is provided with a flow hole 14 in communication with a second containing cavity at the connection position of the first discharge pipe 80, and the fluid in the second containing cavity enters the first discharge pipe 80 through the flow hole 14 and is discharged through the first discharge pipe 80. The first discharge pipe 80 is tangent to the upper end of the main body structure 10, and the tangent line tangent to the top position of the main body structure 10 is a first tangent line, that is, the tangential discharging of the mixing device, when the stirring structure 20 rotates counterclockwise, the discharging direction of the first discharge pipe 80 is the same as the extension direction of the first tangent line, and the uniform overflow of the reaction system is realized by the shearing vortex effect of the stirring structure 20, so as to prevent the problems of solid accumulation and blockage, liquid-liquid and gas-liquid stratification in the first discharge pipe 80, and reduce the reactor efficiency and reaction process deterioration. The first discharge pipe 80 can be connected with an external material collecting pipeline or device.

[0098] Referring to Figures 1 to 17 Fig. 1, in an embodiment of the present application, the mixing device further comprises a second discharge pipe 90 extending in a third direction, one end of the second discharge pipe 90 is connected to the main body structure 10 and communicates with the reaction space, and the other end of the second discharge pipe 90 forms a discharge port 91, and the third direction is perpendicular to the first direction.

[0099] In the embodiment, the third direction refers to Figure 6 the horizontal direction in the figure. The main body structure 10 is a circular tube structure, and the second discharge pipe 90 is connected to the bottom of the main body structure 10, that is, the tangential discharging of the second discharge pipe 90, when the stirring structure 20 rotates counterclockwise, the discharging direction of the second discharge pipe 90 is opposite to the flow direction of the fluid in the second containing cavity at the bottom of the main body structure 10, and the solid or heavy phase deposited in the second discharge pipe 90 is entrained out by the shearing vortex effect of the stirring structure 20, and is uniformly mixed with the fluid in the second containing cavity, thereby solving the problems of solid blockage of the second discharge pipe 90 or incomplete discharge in the reactor.

[0100] Referring to Figures 1 to 17 Fig. 1, in an embodiment of the present application, the mixing device further comprises a driving structure 100, and the driving structure 100 is drivingly connected with the stirring structure 20.

[0101] Through the above arrangement, the stirring structure 20 can rotate relative to the first containing cavity 11 around the central axis of the stirring structure 20.

[0102] Referring to Figures 1 to 17 Fig. 1, in an embodiment of the present application, the main body structure 10 is provided with a sampling pipe 113 in communication with the reaction space.

[0103] In the present embodiment, the sampling tube 113 is used to drain the fluid in the reaction space for online sampling or online analysis.

[0104] With reference to Figures 1 to 17 As shown in the drawings, in one embodiment of the present application, the driving structure 100 comprises a driving motor 105 and a shaft coupling 106, the driving motor 105 is connected with the one end of the stirring structure 20 penetrating through the first shell 101 through the shaft coupling 106, so that the driving motor 105 can drive the stirring structure 20 to rotate along the central axis of the stirring structure 20 relative to the first containing cavity 11.

[0105] With reference to Figures 1 to 17 As shown in the drawings, in one embodiment of the present application, the both ends of the main body structure 10 are provided with flanges 114, the one end of the first shell 101 towards the main body structure 10 is provided with a flange 114, the one end of the second shell 102 towards the main body structure 10 is provided with a flange 114, the flange 114 of the one end of the main body structure 10 is bolted with the flange 114 on the first shell 101, and the flange 114 of the other end of the main body structure 10 is bolted with the flange 114 on the second shell 102.

[0106] The mixing device further comprises a first sealing ring 115, a second sealing ring 116 and a third sealing ring 117, the first sealing ring 115 and the second sealing ring 116 are both installed in the inner cavity of the first shell 101, the first sealing ring 115 and the second sealing ring 116 are arranged in the first direction, the part of the first end of the stirring structure 20 penetrating into the inner cavity of the first shell 101 is sequentially provided with the second sealing ring 116 and the first sealing ring 115, the outer peripheral surface of the first sealing ring 115 and the second sealing ring 116 is tightly combined with the inner wall surface of the inner cavity of the first shell 101, the inner peripheral surface of the first sealing ring 115 and the second sealing ring 116 is tightly combined with the outer wall surface of the stirring structure 20, the first sealing ring 115, the second sealing ring 116 and the inner wall surface of the inner cavity of the first shell jointly enclose an annular containing cavity, at the same time, the side of the second sealing ring 116 away from the first sealing ring 115 can seal one end of the reaction space, the third sealing ring 117 is installed in the inner cavity of the second shell 102, the outer peripheral surface of the third sealing ring 117 is tightly combined with the inner wall surface of the inner cavity of the second shell 102, the inner peripheral surface of the third sealing ring 117 is tightly combined with the outer wall surface of the stirring structure 20, at the same time, the side of the third sealing ring 117 towards the main body structure 10 can seal the other end of the reaction space. Through the above arrangement, the sealing connection of the one end of the main body structure with the first shell and the sealing connection of the other end of the main body structure with the second shell can be realized.

[0107] With reference to Figures 1 to 17As shown, in one embodiment of the utility model, the mixing device further comprises a first pipeline 107, a second pipeline 108, a third pipeline 109, a fourth pipeline 110, a fifth pipeline 111 and a sixth pipeline 112, one end of the stirring structure 20 penetrating out of the second shell 102 is communicated with the first pipeline 107, the second pipeline 108 is fixedly connected with the main body structure 10, the second pipeline 108 is communicated with the first feed inlet 12, the third pipeline 109 is fixedly connected with the shell 40, the third pipeline 109 is communicated with the second fluid outlet 42, the fourth pipeline 110 is fixedly connected with the first shell 101, the fourth pipeline 110 is communicated with the second fluid inlet 103, the fifth pipeline 111 is fixedly connected with the shell 40, the fifth pipeline 111 is communicated with the third fluid inlet 41, one end of the sixth pipeline 112 is communicated and the other end is not communicated, the blind end of the sixth pipeline 112 extends into the reaction space, the temperature measuring device can be installed in the sixth pipeline 112, the temperature of the reaction space is monitored, the number and position of the sixth pipeline 112 can be adjusted according to actual needs.The temperature measuring device can adopt the temperature measuring device of prior art, and the specific structure will not be repeated here.

[0108] Wherein, one end of the stirring structure 20 penetrating out of the second shell 102 is screwed with the first pipeline 107.The number of the second pipeline 108 is at least 2, so that the materials participating in the reaction are added separately, and the chemical reaction is ensured to occur in the reaction space.

[0109] In the continuous chemical process in which the reaction system involves solid materials, the mixing scheme of the existing reaction device can either achieve macro mixing of the materials, mass transfer efficiency dominates the macro reaction rate, and the reaction efficiency is low due to material back mixing, which greatly reduces the advantages of continuous process; or it can weaken the material back mixing effect, but the complexity and difficulty of the implementation of the continuous reaction process and the supporting equipment and facilities are increased, which is difficult to be applied in industry; or it can prevent material back mixing, but the reaction volume is limited, the processing precision of the reaction device is high, the investment is large, etc., which is also difficult to be used in large-capacity continuous chemical production; in addition, the existing mechanical mixing scheme is mostly macro mixing of heterogeneous materials, and the mass transfer process restricts the macro reaction speed, which also leads to the reduction of the efficiency of the continuous reaction device. In summary, the mixing device of the present application not only can realize the enhanced mixing and distribution of heterogeneous materials such as solids, solve the problem of mass transfer efficiency limiting reaction efficiency, but also the mixing occurs on the radial cross section, which inhibits the material back mixing in the mainstream direction from the process, maximizes the reaction efficiency of the continuous reaction device, and with the problem of strong heat release introduced by the reaction speed-up, the present application adopts a double-sided cooling design to control the uniformity and stability of the reaction temperature, thereby avoiding the risks of thermal runaway, material deterioration or selectivity deterioration. At the same time, the present application enhances the mixing and ideal plug flow, has high heat removal and temperature control capacity, not only meets the continuous chemical process involving solids, but also is suitable for liquid-liquid heterogeneous and gas-liquid heterogeneous continuous chemical processes. Not only can it realize micro mixing and uniform distribution of solid-liquid reaction systems, solve the typical problem of mass transfer hindering reaction, but also can obtain an approximate plug flow in the continuous reactor, maximize the reaction efficiency, and inhibit the side reaction process. In a certain project kilogram test, the macro reaction rate is increased by more than 2 times, and the continuous reaction time is shortened from 30 min to less than 10 min.

[0110] In actual application process, the temperature data, online sampling or online analysis data can be provided as input signals to the automatic control system, and the automatic output driving motor speed, the temperature and flow control signals of the second installation cavity and the interlayer into the refrigerant or heat medium can be realized. The functions of continuous heterogeneous micro mixing device and reactor full automation, etc. The key technology in the present application has been verified and optimized through simulation, cold model experiment, reaction experiment, and the prototype machine has been debugged and applied. Under relatively harsh test conditions, not only can the radial cross section (perpendicular to the mainstream direction) micro mixing and uniform distribution be realized, but also the material back mixing can be effectively inhibited, and the results meet the design expectation. In a certain continuous project, the mixing device provided by the present application can improve the reaction efficiency of the conventional continuous reaction device by 2 times.

[0111] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: the main body structure and the stirring structure are arranged, at least part of the stirring structure is arranged in the first containing cavity and can rotate relative to the first containing cavity around the central axis of the stirring structure, the part of the stirring structure in the first containing cavity forms a stirring section, the outer wall surface of the stirring section is provided with a plurality of first pits recessed relative to itself, when the stirring structure rotates, strong shearing action perpendicular to the first direction can be formed and the reactant material can be induced to form turbulent vortex, solid material crushing and uniform suspension can be promoted, solid particles can be prevented from being concentrated at the bottom of the first containing cavity due to gravity settlement, the solid material and the liquid material can be fully mixed, and then the micro-mixing and spatial distribution of the solid-liquid system can be strengthened.

[0112] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0113] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0114] The above only describes the preferred embodiments of the utility model, and is not intended to limit the utility model, and those skilled in the art can make various changes and changes to the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A mixing device, characterized by include: The main structure (10) has a first receiving cavity (11) extending along a first direction. A stirring structure (20) extends along the first direction. At least a portion of the stirring structure (20) passes through the first receiving cavity (11) and can rotate relative to the first receiving cavity (11) around the central axis of the stirring structure (20). The portion of the stirring structure (20) located in the first receiving cavity (11) forms a stirring section (21). A reaction space is formed between the outer wall surface of the stirring section (21) and the inner wall surface of the first receiving cavity (11). The main structure (10) is provided with a first feed inlet (12) and a discharge outlet (13) communicating with the reaction space. The outer wall surface of the stirring section (21) is provided with a plurality of first pits (30) that are recessed relative to themselves, and the plurality of first pits (30) are arranged at intervals along the first direction.

2. The mixing device of claim 1, wherein, The maximum depth of the first pit (30) is H1, the sidewall thickness of the stirring section (21) is H2, and H1 / H2 satisfies: 0.5≤H1 / H2≤0.7; and / or, the projection of the first pit (30) along the thickness direction of the sidewall of the stirring section (21) is a circle or an ellipse, and when the projection of the first pit (30) is an ellipse, the ellipticity e of the ellipse is in the range of 0.2≤e≤0.

8.

3. The mixing device of claim 1, wherein, The stirring structure (20) is a circular tube structure. Multiple first pits (30) on the outer wall of the stirring section (21) are spirally arranged in multiple turns along the first direction to form a first spiral structure.

4. The mixing device of claim 3, wherein, The diameter of the stirring structure (20) is D1, and the pitch of the first spiral structure is P1. P1 and D1 satisfy: 2D1≤P1≤4D1.

5. The mixing device of any one of claims 1 to 4, wherein, The inner wall of the first receiving cavity (11) is provided with a plurality of second recesses that are recessed relative to itself.

6. The mixing device of claim 5, wherein, The maximum depth of the second pit is H3, the sidewall thickness of the main structure (10) is H4, and H3 / H4 satisfies: 0.5≤H3 / H4≤0.7; and / or, the projection of the second pit along the thickness direction of the sidewall of the main structure (10) is a circle or an ellipse, and when the projection of the second pit is an ellipse, the ellipticity e of the ellipse is in the range of 0.2≤e≤0.

8.

7. The mixing device of claim 5, wherein, The main structure (10) is a circular tube structure. Multiple second pits located on the inner wall of the first receiving cavity (11) are spirally arranged in multiple turns along the first direction to form a second spiral structure.

8. The mixing device of claim 7, wherein, The diameter of the main structure (10) is D2, and the pitch of the second spiral structure is P2. P2 and D2 satisfy: 2D2≤P2≤4D2.

9. The mixing device of any one of claims 1 to 4, wherein, The stirring section (21) has a second receiving cavity, which forms part of the inner cavity of the stirring structure (20). The stirring structure (20) is provided with a first fluid inlet (22) and a first fluid outlet (23) communicating with the second receiving cavity.

10. The mixing device of claim 9, wherein, The mixing device further comprises a first housing (101) and a second housing (102), one end of the main body structure (10) is in sealing connection with the first housing (101), the other end of the main body structure (10) is in sealing connection with the second housing (102), the first end of the stirring structure (20) is arranged in the inner cavity of the first housing (101), the second end of the stirring structure (20) is arranged in the inner cavity of the second housing (102), the part of the stirring structure (20) located in the inner cavity of the first housing (101) has a third accommodating cavity, the part of the stirring structure (20) located in the inner cavity of the second housing (102) has a fourth accommodating cavity, the third accommodating cavity and the fourth accommodating cavity are in communication with the second accommodating cavity, the part of the stirring structure (20) located in the inner cavity of the first housing (101) is provided with the first fluid inlet (22) in communication with the third accommodating cavity, the part of the stirring structure (20) located in the inner cavity of the second housing (102) is provided with the first fluid outlet (23) in communication with the fourth accommodating cavity, and the first housing (101) is provided with the second fluid inlet (103) in communication with the inner cavity of the first housing (101).

11. The mixing device of claim 9, wherein, The first turbulence structure (70) is arranged in the second accommodating cavity, the first turbulence structure (70) comprises a plurality of first turbulence sub-bodies (71) and a plurality of second turbulence sub-bodies (72), the plurality of first turbulence sub-bodies (71) and the plurality of second turbulence sub-bodies (72) are alternately and spacedly arranged along the first direction, and the outer circumferential surface of each of the first turbulence sub-bodies (71) and the second turbulence sub-bodies (72) has a gap with the side wall of the inner cavity of the stirring section (21).

12. The mixing device of claim 11, wherein, In the second direction, the gap between the bottom end of the first turbulence sub-body (71) and the side wall of the inner cavity of the stirring section (21) is a first gap, the gap between the top end of the first turbulence sub-body (71) and the side wall of the inner cavity of the stirring section (21) is a second gap, the first gap is greater than the second gap, the gap between the bottom end of the second turbulence sub-body (72) and the side wall of the inner cavity of the stirring section (21) is a third gap, the gap between the top end of the second turbulence sub-body (72) and the side wall of the inner cavity of the stirring section (21) is a fourth gap, the third gap is smaller than the fourth gap, the first gap is greater than the third gap, the second gap is smaller than the fourth gap, and the second direction is perpendicular to the first direction.

13. The mixing device of claim 11, wherein, In the first direction, the projection of each of the first turbulence sub-bodies (71) and the second turbulence sub-bodies (72) is a closed figure, and the closed figure is surrounded by an arc segment (711) and a straight line segment (712).

14. The mixing device of any one of claims 1 to 4, wherein, The mixing device further comprises a shell (40) extending along the first direction, the main body structure (10) is at least partially arranged in the shell (40), a sandwich layer (50) is formed between the inner wall of the shell (40) and the outer wall of the main body structure (10), and the shell (40) is provided with a third fluid inlet (41) and a second fluid outlet (42) which are in communication with the sandwich layer (50).

15. The mixing device of claim 14, wherein, The sandwich layer (50) is provided with a second turbulence structure (60), the second turbulence structure (60) comprises a plurality of third turbulence sub-bodies (61) extending along a second direction and a plurality of fourth turbulence sub-bodies (62), the plurality of third turbulence sub-bodies (61) and the plurality of fourth turbulence sub-bodies (62) both extend along the second direction, the plurality of third turbulence sub-bodies (61) are arranged on the outer wall of the main body structure (10) in the first direction, the plurality of fourth turbulence sub-bodies (62) are arranged on the inner wall of the shell (40) in the second direction, each third turbulence sub-body (61) has a gap between one end thereof facing the shell (40) and the inner wall of the shell (40), each fourth turbulence sub-body (62) has a gap between one end thereof facing the main body structure (10) and the outer wall of the main body structure (10), and the plurality of third turbulence sub-bodies (61) and the plurality of fourth turbulence sub-bodies (62) are alternately and spacedly arranged in the first direction.

16. The mixing device of claim 15, wherein, The third turbulence sub-bodies (61) and the fourth turbulence sub-bodies (62) are both circular rings.

17. The mixing device of any one of claims 1 to 4, wherein, The mixing device further comprises a first discharge pipe (80) extending along a third direction, the first discharge pipe (80) is connected with the main body structure (10), the first discharge pipe (80) is in communication with the reaction space, one end of the first discharge pipe (80) forms the discharge port (13), and the third direction is perpendicular to the first direction; and / or the mixing device further comprises a second discharge pipe (90) extending along a third direction, one end of the second discharge pipe (90) is connected with the main body structure (10) and is in communication with the reaction space, and the other end of the second discharge pipe (90) forms a discharge port (91), and the third direction is perpendicular to the first direction.

18. The mixing device of any one of claims 1 to 4, wherein, The mixing device further comprises a driving structure (100), the driving structure (100) is drivingly connected with the stirring structure (20); and / or the main body structure (10) is provided with a sampling pipe (113) which is in communication with the reaction space.

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