CN109260977B - Switchable free/limited impinging stream mixer and application method thereof - Google Patents
Switchable free/limited impinging stream mixer and application method thereof Download PDFInfo
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- CN109260977B CN109260977B CN201811254547.9A CN201811254547A CN109260977B CN 109260977 B CN109260977 B CN 109260977B CN 201811254547 A CN201811254547 A CN 201811254547A CN 109260977 B CN109260977 B CN 109260977B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
- B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
Abstract
The invention discloses a switchable free/limited impinging stream mixer and a use method thereof. The device comprises a main body unit, a mixing unit and a connecting and fixing unit; the connecting and fixing unit comprises an A joint, a B joint and a fixing disc, wherein the A joint and the B joint respectively penetrate through two channels in the center of the fixing disc; the mixing unit is of a quadrangular prism structure, the lower bottom surface of the mixing unit is provided with an annular convex edge, the convex edge is connected with the main body unit in a nested manner, and the center of the inside of the mixing unit is provided with a circular step hole with unequal diameters; the whole body unit is of a C-shaped structure; an L-shaped channel and an I-shaped channel are respectively arranged in the main body unit, the L-shaped channel penetrates through the side face and the bottom of the C-shaped structure, the I-shaped channel is arranged in parallel with the top of the L-shaped channel, and the upper ends of the I-shaped channel are respectively connected with the connector; the internal cavity of the C-shaped structure can house the mixing unit. According to the invention, through changing the unit combination form, the switching of two mixed modes of free and limited modes can be realized; realize the regulation and control of the microcosmic mixing performance of the mixer.
Description
Technical Field
The invention relates to a switchable free/limited impinging stream mixer and a use method thereof, belonging to the field of reinforcement of fluid micromixing process.
Background
Micromixing is a precondition for molecular reaction, and is an important way for improving micromixing effect by means of process strengthening technology. Common process strengthening technologies mainly comprise supergravity, micro-flow, impinging stream, static mixing and other technologies, and the technologies can be used for realizing the high efficiency and integration of chemical processes.
Supergravity is an important class of process enhancement techniques, whose core equipment is called Rotating Packed Bed (RPB) or supergravity machines. By high-speed rotation of the packed bed, the gravity acceleration of the earth can be greatly increasedgThe fluid is cut into fluid microelements under the actions of shearing, collision, stretching and the like of the filler in the centrifugal force field, so that the micromixing and mass transfer processes of the fluid are greatly enhanced. A large number of researches show that the micromixing time of the RPB is 0.01-0.1 ms, and the micromixing performance is obviously superior to that of other process strengthening devices. For early RPB, the feed liquid is directly input into the filler for mixing and reaction without premixing, so that partial reactants are not mixed sufficiently, and some reactants are discharged even without contact, thus affecting the quality of the product. In addition, the circumferential distribution condition of the feed liquid in the RPB is poor, and partial filler is not fully utilized. In order to overcome the defects, chinese patent (CN 1425493) discloses an impinging stream-rotating packed bed (IS-RPB), so that the coupling of the supergravity and the impinging stream technology IS realized, and the overall performance of the equipment IS improved. Impinging streams are another important process enhancement technique, and are classified into Free Impinging Streams (FIS) and restricted impinging streams (CIS) according to the fluid impinging pattern. The micro-mixing performance of CIS devices is significantly better than FIS devices due to the wall and internal pressure. The impinging stream device has a simple structure,continuous operation is mainly adopted, but the residence time is short, and the continuous operation is often combined with other equipment. IS-RPB generally uses FIS device as the pre-mixer, on one hand makes the feed liquid carry out preliminary mixing, on the other hand makes the feed liquid strike and forms the liquid level of circumference distribution, provides good liquid initial distribution, and the liquid drop of dispersion IS caught by rotatory packing, further accomplishes mixing, reaction. Notably, the impact surface created by free fluid impact can only cover the filler intermediate layer, leaving a significant amount of filler unused. Meanwhile, FIS is susceptible to fluid disturbance and the impact surface stability is poor. In addition, part of splashed liquid drops are not easy to be captured by the filler, and particularly in the process of preparing superfine/nano powder, the difficulty in cleaning and maintaining the pipe fitting and the shell in the RPB is increased.
Although the micro-mixing performance of IS-RPB and the utilization rate of filler can be further improved by adopting CIS to replace FIS, for a rapid reaction system with sediment generation, the CIS equipment IS easy to generate blocking phenomenon after long-time operation, thereby causing production interruption. Therefore, the CIS mode and the FIS mode have advantages and disadvantages, the single mode cannot meet the production requirement, and the integral performance of the IS-PRB can be further improved and the application field of the IS-PRB can be expanded only by organically combining the CIS mode and the FIS mode.
Disclosure of Invention
The invention aims to provide a switchable free/limited impinging stream mixer and a use method thereof, and the impinging stream mixer integrating limited and free modes is constructed by simple assembly by referring to the integration concept; the problem of the existing single impinging stream mode application IS solved, the micro-mixing performance of IS-RPB IS further improved, and the application range IS widened.
The principle of the invention is as follows: by selecting different units for assembly, the free impinging stream mode and the limited impinging stream mode can be mutually switched; by varying the structure of the mixing unit and the operating conditions, the micro-mixing performance of the device can be adjusted.
The invention provides a switchable free/limited impinging stream mixer, which comprises a main body unit, a mixing unit and a connecting and fixing unit, wherein the main body unit is connected with the mixing unit;
the connecting and fixing unit comprises a joint A, a joint B and a fixing disc, wherein one ends of the joint A and the joint B are of tower structures and are used for connecting a liquid inlet pipe, the other ends of the joint A and the joint B are provided with external threads, the external threads of the joint A are used for connecting a main body unit, the external threads of the joint B are used for connecting a mixing unit, the middle part of the joint is of square prism structures, and the rotary joint is convenient; the fixed disk is of a disk-shaped structure, an elliptical boss is arranged at the upper end of the disk, a circular boss is arranged at the lower end of the disk, two channels are arranged in parallel in the center of the fixed disk, and the pipe fitting penetrates through the two channels respectively and is connected with the A, B joint;
a retaining disk is used to support the tube and can secure the mixer inside the RPB.
The mixing unit is of a quadrangular prism structure, the lower bottom surface of the mixing unit is provided with an annular convex edge, the convex edge is connected with the main body unit in a nested manner, the center of the inside of the mixing unit is provided with a circular step hole with unequal diameters, and sealing among the units can be realized; the circular step hole is sequentially provided with a first hole, a second hole and a third hole from top to bottom, threads are arranged in the first hole and are connected with the connector, the side surface of the second hole is vertically communicated with the liquid outlet, the second hole is vertically arranged with the liquid outlet, the liquid outlet is of a gradually-expanding structure, the distribution of liquid is facilitated, the diameter of the third hole is larger than that of the second hole, and the third hole is communicated with a pore canal at the lower part of the main body unit;
the whole body unit is of a C-shaped structure; an L-shaped channel and an I-shaped channel are respectively arranged in the main body unit, the L-shaped channel penetrates through the side face and the bottom of the C-shaped structure, the I-shaped channel is arranged in parallel with the top of the L-shaped channel, the upper end of the L-shaped channel is connected with the joint A, liquid flows out of the main body L-shaped channel and the joint B respectively and collides with the main body L-shaped channel and the joint B, and an impinging stream is formed under certain conditions to strengthen the micro-mixing process;
the internal cavity of the C-shaped structure can be used for placing the mixing unit; the upper surface of the bottom of the mixing unit is provided with an annular groove which is nested with the bottom convex edge of the mixing unit, so that the mixing unit is convenient to fix and seal; the center of the annular groove is provided with a hole which is communicated with the bottom of the L-shaped channel; the bottom of the main body unit is vertically and downwards provided with a flushing hole for cleaning the device.
In the switchable free/limited impinging stream mixer, the mixing unit is fixed at the inner cavity of the main body unit through the bolts, the lower bottom surface of the cavity, namely the upper surface of the bottom of the main body unit, is provided with the annular groove, and the outer edge of the surface is designed with the chamfer.
In the switchable free/limited impinging stream mixer, the inner diameter of the L-shaped channel of the main body unit is 6.0-8.0 mm, the length of the upper thread of the channel is 10.0-15.0 mm, and the thread is of the national standard model M6-M8 and is connected with the joint A; the aperture of the central hole of the annular groove is 1.0-3.0 mm, and the hole depth is 8.0-24.0 mm; the inner diameter of the I-shaped channel is 6.0-8.0 mm, and the hole depth is 8.0-10.0 mm; the center-to-center spacing of the two channels is at least 20 mm, so that the connecting device is convenient to install and maintain.
The switchable free/limited impinging stream mixer has the advantages that the inner diameter of a first channel of a hole in a mixing unit is 6.0-8.0 mm, the length of the first channel is 5.0-10.0 mm, and threads are of national standard M6-M8 types and are connected with a joint B; the inner diameter of the channel of the second hole is 2.0-4.0 mm, the length of the channel is 2.0-4.0 mm, and the channel is a limited mixing cavity; the minimum aperture of the liquid outlet is 1.0 mm, the maximum aperture is 6.0 mm, the liquid outlet is of a divergent structure, and the divergent angle is 30-60 degrees; the height of the annular convex rib on the lower bottom surface of the mixing unit is 1.0-1.5 mm, and the radial thickness is 1.0 mm.
In the switchable free/limited impinging stream mixer, the outer diameter of the joint A is 6.0-8.0 mm, the wall thickness is 1.0-2.0 mm, and the side length of the square structure is the same as the outer diameter of the joint; different from the joint A, the outer diameter of the joint B is smaller than the inner diameter of the I-shaped channel, so that the joint B can penetrate through the I-shaped channel to be connected with the mixing unit, and a chamfer angle of 45-60 degrees is arranged outside the joint B; the inside of the threaded section of the joint B is a pore which is consistent with the pore structure in the center of the annular groove of the main body unit, and the centers of the threaded section and the pore structure are opposite to each other.
The center-to-center distance between the two channels in the fixed disk of the switchable free/limited impinging stream mixer is at least 20.0 mm, and the switchable free/limited impinging stream mixer is respectively aligned with the L-shaped channel and the I-shaped channel of the main body unit; the height difference between the mixing unit and the cavity of the main body unit is at least 5.0 mm, so that the mixing unit is convenient to mount and dismount; the annular convex edges of the mixing unit are matched with the grooves of the main body unit, and are fastened through bolts on the upper side of the main body unit, wherein the specifications of the bolts are M2-M3; the groove is internally provided with a sealing gasket, the depth of the groove is 1.5-2.0 mm, and the width of the groove is larger than the thickness of the convex rib.
The switchable free/limited impinging stream mixer is characterized in that all components are made of one material of resin and nylon and are formed by 3D printing. When the mixer is used in combination with the RPB, the distance between the outer edge of the main body unit and the inner edge of the RPB filler is larger than 10.0 mm, so that collision between the main body unit and the RPB filler is avoided.
The invention provides a use method of the switchable free/limited impinging stream mixer, which comprises the following steps:
(1) The main body unit, the mixing unit, the connecting and fixing unit are selected and assembled into the limited impinging stream mixer in sequence, and the specific assembly process is as follows: firstly, embedding a mixing unit into a cavity of a main body unit, and fixing the mixing unit by adopting bolts; then, passing the B-connector through the I-channel and connecting with the mixing unit; then, connecting the A joint with the L-shaped channel; finally, the liquid inlet pipe fitting penetrates through the channel of the fixed disc and is respectively connected with the A, B connectors; forming a confined impinging stream mixer.
A series of mixing units with different structures are processed by changing the structural parameters such as the inner diameter, the length, the divergent angle of a liquid outlet and the like of the second hole, and the regulation and control of the whole micro mixing effect of the equipment are realized by selecting and matching different mixing units or regulating the liquid flow; the mixer is arranged in the RPB through the fixed disk and is mainly used for strengthening the homogeneous phase rapid reaction process.
(2) Removing the mixing unit in the limited impinging stream mixer, namely switching to a free impinging stream mixer; the distance between the joint B and the central hole of the annular groove is changed by adjusting the position of the joint B, or the liquid flow is regulated, so that the micro-mixing effect of the equipment is optimized; is fixed in RPB, can strengthen the rapid precipitation reaction process, and is applied to the field of superfine/nano material preparation.
The invention provides a switchable impinging stream mixer, which can switch between free and limited mixing modes through a regulating unit combination form, and can be coupled with RPB to strengthen the homogeneous phase and rapid precipitation reaction process. The invention has the beneficial effects that:
(1) The structure of the composition unit is simple, each unit is provided with a series of different specifications, and the unit molding materials are easy to obtain, clear and maintain, so that the mixer can be used for theoretical research and actual production;
(2) By changing the combination form of the units, the switching of two mixed modes of freedom and limitation can be realized; by changing the internal structure of the unit, the micro mixing performance of the mixer can be regulated and controlled;
(3) The impinging stream mixer has simple structure and convenient assembly, can be coupled with the RPB, not only can improve the micromixing performance of the IS-RPB, but also can greatly expand the application range of the IS-RPB.
Drawings
FIG. 1 is a perspective view of a main unit of the present invention;
FIG. 2 is a front view of the main unit of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a perspective view of a mixing unit according to the present invention;
FIG. 5 is a front view of a mixing unit of the present invention;
FIG. 6 is a cross-sectional view B-B of FIG. 5;
FIG. 7 is a perspective view of the joint A of the present invention;
FIG. 8 is a front view of the A-joint of the present invention
FIG. 9 is a cross-sectional view of C-C of FIG. 8;
FIG. 10 is a perspective view of the joint B of the present invention;
FIG. 11 is a front view of the B-adapter of the present invention;
FIG. 12 is a sectional view D-D of FIG. 11;
FIG. 13 is a perspective view of a holding pan of the present invention;
FIG. 14 is a front view of a holding pan of the present invention;
FIG. 15 is a cross-sectional view E-E of FIG. 14;
FIG. 16 is an assembly view of a limited impingement flow mixer of the present invention;
FIG. 17 is an assembly view of a free impinging stream mixer of the present invention;
FIG. 18 is a flow chart of a process for preparing an electrode material from a free impinging stream-rotating packed bed (FIS-RPB);
in the figure: 1-a main body unit; 2-a mixing unit; 3-A linker; a 4-B linker; 5-a fixed disc; a 6-L-shaped channel; 7-I-shaped channel; 8-a first threaded hole; 9-a second threaded hole; 10 a third threaded hole; 11-a cavity; 12-an annular groove; 13-flushing holes; 14-annular rib; 15-a mixing chamber; 16-a liquid outlet; 17-a boss; 18-parallel channels; 19-a first reservoir; 20-a pump; 21-a flow regulating valve; 22-a flow meter; 23-a second reservoir; 24-a motor and a controller; 25-a product collector; 26-a hydrothermal kettle; 27-free impinging stream mixer; 28-free impinging stream-rotating packed bed. Detailed Description
The present invention is further illustrated by, but not limited to, the following examples.
Examples:
as shown in fig. 1 to 17, a switchable free/limited impinging stream mixer comprises a main body unit 1, a mixing unit 2, and a connecting and fixing unit;
the connecting and fixing unit comprises an A joint 3, a B joint 4 and a fixing disc 5, one ends of the A joint 3 and the B joint 4 are of tower structures and are used for connecting a liquid inlet pipe, external threads are arranged at the other ends of the A joint 3 and are used for connecting the main body unit 1, external threads of the B joint 4 are used for connecting the mixing unit 2, the middle parts of the A joint 3 and the B joint 4 are of square prism structures, and the rotary joint is convenient; the fixed disk 5 is of a disk-shaped structure, an elliptical boss 17 is arranged at the upper end of the disk, a circular boss is arranged at the lower end of the disk, two parallel channels 18 are arranged in the center of the fixed disk 5, and pipe fittings respectively penetrate through the two channels to be connected with a A, B joint;
a fixing plate 5 is used to support the tube, which can fix the mixer inside the RPB.
The mixing unit 2 is of a quadrangular prism structure, the lower bottom surface of the mixing unit is provided with an annular rib 14, the annular rib 14 is connected with the main unit 1 in a nested manner, the center of the inside of the mixing unit 2 is provided with a circular step hole with unequal diameters, and sealing among the units can be realized; the circular step hole is sequentially provided with a first hole, a second hole and a third hole from top to bottom, threads are arranged in the first hole and are connected with the connector, the side surface of the second hole is vertically communicated with the liquid outlet 16, the second hole is a mixing cavity 15 and is arranged in a T shape with the liquid outlet 16, the liquid outlet 16 is in a gradually expanding structure, the distribution of liquid is facilitated, the diameter of the third hole is larger than that of the second hole, and the third hole is communicated with a lower pore canal of the main body unit;
the whole body unit 1 is in a C-shaped structure; an L-shaped channel 6 and an I-shaped channel 7 are respectively arranged in the main body unit 1, the L-shaped channel 6 penetrates through the side face and the bottom of the C-shaped structure, the I-shaped channel 7 is arranged in parallel with the top of the L-shaped channel 6, the upper end of the L-shaped channel 6 is connected with the A joint 3, the B joint 4 penetrates through the I-shaped channel 7 to be connected with the mixing unit 2, liquid flows out of the main body L-shaped channel 6 and the B joint 4 respectively and collides, an impinging stream is formed under certain conditions, and the micromixing process is enhanced;
the internal cavity 11 of the C-shaped structure is able to house the mixing unit 2; the upper surface of the bottom of the C-shaped structure is provided with an annular groove 12, and the annular groove 12 is nested with the bottom convex edge of the mixing unit 2, so that the mixing unit 2 is convenient to fix and seal; the center of the annular groove 12 is provided with a hole which is communicated with the bottom of the L-shaped channel; the bottom of the main body unit 1 is provided with a flushing hole 13 vertically downwards for cleaning the device.
In the switchable free/limited impinging stream mixer described above, the mixing unit 2 is fixed to the inner cavity 11 of the main body unit 1 by bolts, and the lower bottom surface of the cavity 11, i.e., the upper surface of the bottom of the main body unit 1, is provided with an annular groove 12, and the outer edge of the surface is designed with a chamfer.
In the switchable free/limited impinging stream mixer, the inner diameter of the L-shaped channel 6 of the main body unit is 6.0-8.0 mm, the length of the upper thread of the channel is 10.0-15.0 mm, and the thread is of the national standard model M6-M8 and is used with the joint A3; the aperture of the central hole of the annular groove 12 is 1.0-3.0 mm, and the hole depth is 8.0-24.0 mm; the inner diameter of the I-shaped channel 7 is 6.0-8.0 mm, and the hole depth is 8.0-10.0 mm; the center-to-center spacing of the two channels is at least 20 mm, so that the connecting device is convenient to install and maintain.
The switchable free/limited impinging stream mixer has the advantages that the inner diameter of a first channel of a hole in a mixing unit is 6.0-8.0 mm, the length of the first channel is 5.0-10.0 mm, and threads are of national standard M6-M8 types and are connected with a joint B; the inner diameter of the channel of the second hole is 2.0-4.0 mm, the length of the channel is 2.0-4.0 mm, and the channel is a limited mixing cavity; the minimum aperture of the liquid outlet 16 is 1.0 mm, the maximum aperture is 6.0 mm, the liquid outlet 16 is of a gradually-expanding structure, and the gradually-expanding angle is 30-60 degrees; the height of the annular convex edge 14 on the lower bottom surface of the mixing unit 2 is 1.0-1.5 mm, and the radial thickness is 1.0 mm.
In the switchable free/limited impinging stream mixer, the outer diameter of the joint A3 is 6.0-8.0 mm, the wall thickness is 1.0-2.0 mm, and the side length of the square structure is the same as the outer diameter of the joint; different from the joint A3, the outer part of the joint B4 is provided with a chamfer angle of 45-60 degrees, and the outer diameter of the chamfer angle is smaller than the inner diameter of the I-shaped channel, so that the chamfer angle can penetrate through the I-shaped channel 7 to be connected with the mixing unit 2; the inside of the threaded section of the joint B is a pore which is consistent with the pore structure in the center of the annular groove of the main body unit, and the centers of the threaded section and the pore structure are opposite to each other.
The center-to-center spacing between the two channels in the fixed disk 5 of the switchable free/restricted impinging stream mixer is at least 20.0 mm, and the switchable free/restricted impinging stream mixer is respectively aligned with the L-shaped channel 6 and the I-shaped channel 7 of the main body unit; the height difference between the cavities of the mixing unit 2 and the main body unit 1 is at least 5.0 and mm, so that the installation and the disassembly are convenient; the annular convex edges 14 of the mixing unit 2 are matched with the annular grooves 12 of the main body unit, and are fastened through bolts on the upper side of the main body unit, wherein the specifications of the bolts are M2-M3; the annular groove 12 is internally provided with a sealing gasket, the depth of the annular groove 12 is 1.5-2.0 mm, and the groove width is larger than the thickness of the annular convex rib 14.
The switchable free/limited impingement flow mixer described above, all components may be made of one of resin, nylon, and molded by 3D printing. When the mixer is used in combination with the RPB, the distance between the outer edge of the main body unit and the inner edge of the RPB filler is larger than 10.0 mm, so that collision between the main body unit and the RPB filler is avoided.
FIG. 18 sets forth a process flow diagram for preparing electrode material from a free impinging stream-rotating packed bed (FIS-RPB).
The invention provides a use method of the switchable free/limited impinging stream mixer, which comprises the following steps:
(1) The main body unit, the mixing unit, the connecting and fixing unit are selected and assembled into the limited impinging stream mixer in sequence, and the specific assembly process is as follows: firstly, embedding a mixing unit into a cavity of a main body unit, and fixing the mixing unit by adopting bolts; then, passing the B-connector through the I-channel and connecting with the mixing unit; then, connecting the A joint with the L-shaped channel; finally, the liquid inlet pipe fitting penetrates through the channel of the fixed disc and is respectively connected with the A, B connectors; forming a confined impinging stream mixer.
A series of mixing units with different structures are processed by changing the structural parameters such as the inner diameter, the length, the divergent angle of a liquid outlet and the like of the second hole, and the regulation and control of the whole micro mixing effect of the equipment are realized by selecting and matching different mixing units or regulating the liquid flow; the mixer is arranged in the RPB through the fixed disk and is mainly used for strengthening the homogeneous phase rapid reaction process.
(2) Removing the mixing unit in the limited impinging stream mixer, namely switching to a free impinging stream mixer; the distance between the joint B and the central hole of the annular groove is changed by adjusting the position of the joint B, or the liquid flow is adjusted, so that the micro-mixing effect of the equipment can be optimized; is fixed in RPB, can strengthen the rapid precipitation reaction process, and is applied to the field of superfine/nano material preparation.
Claims (8)
1. A switchable free/restricted impingement flow mixer, characterized by: comprises a main body unit, a mixing unit and a connecting and fixing unit;
the connecting and fixing unit comprises a joint A, a joint B and a fixing disc, wherein one ends of the joint A and the joint B are of tower structures and are used for connecting a liquid inlet pipe fitting, the other ends of the joint A and the joint B are provided with external threads, the external threads of the joint A are used for connecting a main body unit, the external threads of the joint B are used for connecting a mixing unit, the middle part of the joint is of square prism structures, and the rotary joint is convenient; the fixed disk is of a disk-shaped structure, an elliptical boss is arranged at the upper end of the disk, a circular boss is arranged at the lower end of the disk, two channels are arranged in parallel in the center of the fixed disk, and the pipe fitting penetrates through the two channels respectively and is connected with the A, B joint;
the mixing unit is of a quadrangular prism structure, the lower bottom surface of the mixing unit is provided with an annular convex edge, the convex edge is connected with the main body unit in a nested manner, and the center of the inside of the mixing unit is provided with a circular step hole with unequal diameters; the circular step hole is sequentially provided with a first hole, a second hole and a third hole from top to bottom, threads are arranged in the first hole and connected with the joint B, the side surface of the second hole is vertically communicated with the liquid outlet, the second hole is vertically arranged with the liquid outlet, the liquid outlet is of a gradually-expanding structure, the distribution of liquid is facilitated, and the diameter of the third hole is larger than that of the second hole;
the whole body unit is of a C-shaped structure; an L-shaped channel and an I-shaped channel are respectively arranged in the main body unit, the L-shaped channel penetrates through the side face and the bottom of the C-shaped structure, the I-shaped channel is arranged in parallel with the top of the L-shaped channel, and the upper end of the L-shaped channel is connected with the connector A; the internal cavity of the C-shaped structure can be used for placing the mixing unit; the joint B passes through the I-shaped channel to be connected with the mixing unit; the upper surface of the bottom of the C-shaped structure is provided with an annular groove which is nested with the bottom convex edge of the mixing unit, so that the mixing unit is convenient to fix and seal; the center of the annular groove is provided with a hole which is parallel to the I-shaped channel and communicated with the bottom of the L-shaped channel, and the hole III is communicated with the center hole of the lower annular groove of the main body unit; the bottom of the main body unit is vertically and downwards provided with a flushing hole.
2. The switchable free/limited impingement flow mixer of claim 1, wherein: the mixing unit is fixed in the internal cavity of the main body unit through a bolt, the lower bottom surface of the cavity, namely the upper surface of the bottom of the main body unit, is provided with an annular groove, and the outer edge of the surface is designed with a chamfer.
3. The switchable free/limited impingement flow mixer of claim 1, wherein: the inner diameter of the L-shaped channel of the main body unit is 6.0-8.0 mm, the length of the thread at the upper part of the channel is 10.0-15.0 mm, and the thread adopts national standard M6-M8 model and is connected with the joint A; the inner diameter of the central hole of the annular groove is 1.0-3.0 mm, and the hole depth is 8.0-24.0 mm; the inner diameter of the I-shaped channel is 6.0-8.0 mm, and the hole depth is 8.0-10.0 mm; the center-to-center spacing of the two channels is at least 20 mm, so that the connecting device is convenient to install and maintain.
4. The switchable free/limited impingement flow mixer of claim 1, wherein: the inner diameter of a channel of the first hole in the mixing unit is 6.0-8.0 mm, the length of the channel is 5.0-10.0 mm, and the threads are of national standard M6-M8 type and are connected with the joint B; the inner diameter of the channel of the second hole is 2.0-4.0 mm, the length of the channel is 2.0-4.0 mm, and the channel is a limited mixing cavity; the minimum aperture of the liquid outlet is 1.0 mm, the maximum aperture is 6.0 mm, the liquid outlet is of a divergent structure, and the divergent angle is 30-60 degrees; the height of the convex edges of the lower bottom surface of the mixing unit is 1.0-1.5 mm, and the radial thickness is 1.0 mm.
5. The switchable free/limited impingement flow mixer of claim 1, wherein: the outer diameter of the joint A is 6.0-8.0 mm, the wall thickness is 1.0-2.0 mm, and the side length of the square structure is the same as the outer diameter of the joint; different from the joint A, the outer diameter of the joint B is smaller than the inner diameter of the I-shaped channel, so that the joint B can penetrate through the I-shaped channel to be connected with the mixing unit, and a chamfer angle of 45-60 degrees is arranged outside the joint B; the inside of the threaded section of the joint B is a pore which is consistent with the pore structure in the center of the annular groove of the main body unit, and the centers of the threaded section and the pore structure are opposite to each other.
6. The switchable free/limited impingement flow mixer of claim 1, wherein: the center distance between the two channels in the fixed disc is at least 20.0 and mm, and the two channels are respectively aligned with the L-shaped channel and the I-shaped channel of the main body unit; the height difference between the mixing unit and the cavity of the main body unit is at least 5.0 mm, so that the mixing unit is convenient to mount and dismount; the annular convex edges of the mixing unit are matched with the grooves of the main body unit, and are fastened through bolts on the upper side of the main body unit, wherein the specifications of the bolts are M2-M3; the groove is internally provided with a sealing gasket, the depth of the groove is 1.5-2.0 mm, and the width of the groove is larger than the thickness of the convex rib.
7. The switchable free/limited impingement flow mixer of claim 1, wherein: all the components are made of one material of resin and nylon.
8. A method of using a switchable free/restricted impingement flow mixer according to any of claims 1 to 7, comprising the steps of:
(1) The main body unit, the mixing unit, the connecting and fixing unit are selected and assembled into the limited impinging stream mixer in sequence, and the specific assembly process is as follows: firstly, embedding a mixing unit into a cavity of a main body unit, and fixing the mixing unit by adopting bolts; then, passing the B-connector through the I-channel and connecting with the mixing unit; then, connecting the A joint with the L-shaped channel; finally, the liquid inlet pipe fitting penetrates through the channel of the fixed disc and is respectively connected with the A, B connectors; forming a confined impinging stream mixer;
by changing the inner diameter, length and divergent angle of the liquid outlet of the second hole, a series of mixing units with different structures can be processed, and by selecting different mixing units or adjusting the liquid flow, the whole micro mixing effect of the equipment can be regulated and controlled; the mixer is arranged in the RPB through a fixed disc and is used for strengthening the homogeneous phase rapid reaction process;
(2) Removing the mixing unit in the limited impinging stream mixer, namely switching to a free impinging stream mixer; the distance between the joint B and the central hole of the annular groove is changed by adjusting the position of the joint B, or the liquid flow is regulated, so that the micro-mixing effect of the equipment is optimized; is fixed in RPB to strengthen the precipitation reaction process, and is used in the field of superfine/nanometer material preparation.
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