CN111632570A

CN111632570A - Self-oscillation annular jet stirring system

Info

Publication number: CN111632570A
Application number: CN202010448089.3A
Authority: CN
Inventors: 田海平; 李芬; 张一田; 金梓谦; 周谧
Original assignee: Taiyuan University of Technology
Current assignee: Taiyuan University of Technology
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-09-08
Anticipated expiration: 2040-05-25
Also published as: CN111632570B

Abstract

The invention belongs to the technical field of stirring, and particularly relates to a self-oscillation annular jet stirring system. The problem of traditional agitated vessel be difficult to seal because of the motor shaft is solved, including the stirred tank casing, vibrate efflux annular agitating unit, the medium entry, the export of supernatant, the efflux liquid pipeline, diaphragm force pump and medium export, it sets up in the stirred tank casing to vibrate efflux annular agitating unit, stirred tank casing top sets up the medium entry, stirred tank casing upper portion one side sets up the export of supernatant, stirred tank casing lower part sets up the medium export, the export of supernatant passes through diaphragm force pump and efflux liquid pipeline and the access connection who vibrates efflux annular agitating unit. The self-excited oscillation annular jet flow stirring device does not use paddles and blades, does not generate strong shear flow, and does not damage the molecular structure of flora and related organic solution.

Description

Self-oscillation annular jet stirring system

Technical Field

The invention belongs to the technical field of stirring, and particularly relates to a self-oscillation annular jet stirring system.

Background

In organic solutions containing biological bacteria or other substances which are not suitable for withstanding strong shear, substances such as cell membranes, long-chain polymers, etc. are present, and these solutions are often accompanied by agitation during the biological treatment process or the associated chemical reactions. The stirring equipment commonly used at present comprises a mechanical stirring device and a jet stirring device. Most of mechanical stirring devices are complex in structure, strong shear flow can be brought to a local area of a solution when a motor drives stirring blades/stirring paddles to rotate at a high speed, the activity of flora or the long-chain molecular structure of related organic solution is easy to destroy, and the requirements are difficult to meet. Meanwhile, the motor, the paddle and the like can generate larger noise to influence the comfort of the production environment during working. Some current jet flow agitating unit (like "a jet flow agitating unit" that patent publication No. 201620073736.6) are equipped with the stirring rake, not only do not solve the problem of strong shearing, still have the problem of leakproofness because of the stirring rake passes through the motor of agitator shaft connection installation outside the device body, the phenomenon of "running and bleeding leak" often appears.

Disclosure of Invention

The invention provides a self-excited oscillation annular jet flow stirring system, which aims to solve the problem that the traditional stirring equipment is difficult to seal due to a motor shaft.

The invention adopts the following technical scheme: the utility model provides a circular efflux mixing system of auto-excitation oscillation, including the stirred tank casing, vibrate efflux annular agitating unit, the medium entry, the export of upper clear liquid, the efflux liquid pipeline, diaphragm force pump and medium export, it sets up in the stirred tank casing to vibrate efflux annular agitating unit, stirred tank casing top sets up the medium entry, stirred tank casing upper portion one side sets up the export of upper clear liquid, stirred tank casing lower part sets up the medium export, the export of upper clear liquid passes through diaphragm force pump and efflux liquid pipeline and the access connection who vibrates efflux annular agitating unit.

Furthermore, the oscillation jet flow annular stirring device comprises a closed annular device formed by bending and arranging a plurality of oscillation jet flow basic units side by side, and adjacent oscillation jet flow basic units share a feedback channel.

Furthermore, the basic unit of the oscillating jet flow comprises a main cavity, the upper end and the lower end of the main cavity are respectively provided with a water inlet and a water outlet, and each main cavity is provided with a left feedback channel and a right feedback channel which are communicated with the main cavity; the cross-sectional area of the main cavity is larger than that of the left feedback channel and that of the right feedback channel, and the left feedback channel and the right feedback channel of two adjacent main cavities are combined to form a side-by-side common feedback channel.

Furthermore, the cross section of the main chamber is gradually enlarged from the water inlet to the water outlet.

Further, the left feedback channel cross-sectional specification is the same as the right feedback channel cross-sectional specification.

Further, the cross-sectional dimension of the inlet end of the water inlet is larger than the cross-sectional dimension of the outlet end; the cross-sectional dimension of the inlet end of the water outlet is smaller than that of the outlet end.

Furthermore, the water inlets corresponding to the main cavities are connected with the same water inlet cavity.

Furthermore, the two feedback channels between the adjacent main chambers are combined into one feedback channel with the width being 0.8-1.2 times of the width of the feedback channel.

Further, the outer diameters of the oscillating jet flow annular stirring device and the stirring kettle shell are arranged in concentric circles; the jet flow direction of each jet flow outlet on the oscillation jet flow annular stirring device is vertical to the circular plane of the jet flow device, or forms an acute angle with the circular plane of the jet flow device and points to the central shaft of the stirring kettle.

A using method of a self-oscillation annular jet flow stirring system is characterized in that a solution to be stirred enters a stirring kettle shell from a medium inlet and flows out of a stirring kettle from a medium outlet. Under the action of a diaphragm pressure pump, clear liquid on the upper part of the shell enters a jet liquid pipeline from a clear liquid outlet on the upper layer, and is pressurized by the pump and then is sent into a jet inlet pressure cavity positioned at the bottom/upper part/middle part of the stirring kettle; the jet fluid in the water inlet cavity enters the bottom jet stirring device through a plurality of water inlets, and annular jet flows synchronously and alternately swinging in the clockwise direction and the anticlockwise direction are formed on the annular cylindrical surface/conical surface by the water outlets corresponding to the plurality of main cavities; the annular jet flow generated by the oscillation jet flow annular device drives the fluid in the central area of the stirring kettle to generate large-scale jet flow movement, and the fluid flows back to a jet flow generation area along the wall surface of the stirring kettle when meeting the end part of the stirring kettle, so that the internal circulation flow of the stirring kettle is completed.

The oscillating jet flow of the annular jet flow device synchronously makes alternate sweeping motion clockwise and anticlockwise on the cylindrical surface or the conical surface of the annular outlet, and the complex three-dimensional annular jet flow motion is realized through closed annular arrangement.

The three-dimensional ring jet flow movement can drive the fluid in the central area of the three-dimensional ring jet flow to form jet flow movement with larger scale, and the flow rate of the solution participating in the jet flow can reach more than 10 times of the self flow rate of the three-dimensional ring jet flow. The large-scale jet motion can make the liquid in the stirring kettle complete internal circulation flow.

Compared with the prior art, the invention has the following beneficial effects:

1) the self-excited oscillation annular jet flow stirring device does not use paddles and blades, does not generate strong shear flow, and does not damage the molecular structures of flora and related organic solutions;

2) according to the jet stirring device, a plurality of jets on the jet stirring device generate clockwise and anticlockwise alternate swept jets on a cylindrical surface or a conical surface formed by the annular outlet, the jets are complex three-dimensional annular jets, and the stirring efficiency is improved;

3) the three-dimensional annular jet flow generated by the jet flow stirring device can drive the fluid in the inner area to form large-scale jet flow movement, the flow rate of the fluid which can be driven by the three-dimensional annular jet flow stirring device is more than ten times of the flow rate of the three-dimensional annular jet flow, the mixing increasing effect is improved, the internal circulation of the fluid in the kettle is completed, and the stirring efficiency is further improved.

4) The diaphragm pressure pump is used as a power source of the jet device, and components such as the stirring paddle and the sealing shaft are not arranged, so that the problem that the stirring paddle of the traditional paddle stirring equipment is difficult to seal is effectively solved.

5) The jet liquid can be clear liquid at the upper part of the stirring kettle, and other media can be introduced through the spare jet liquid inlet. Meanwhile, the oscillating jet ring device can be arranged at the upper part/lower part or the middle of the stirring kettle. Therefore, the device/the system has strong adaptability and wide application range;

6) the diaphragm pressure pump replaces a conventional stirring motor, and the oscillating jet flow annular device replaces a blade, so that the noise of the device is greatly reduced, and the requirement of low noise in the stirring process is met.

Drawings

Fig. 1 is a structural diagram of an oscillating jet unit according to a first embodiment of the present invention;

FIG. 2 is a parameter diagram of an oscillating fluidic unit according to a first embodiment of the present invention;

FIG. 3 is a structural diagram of a self-oscillating annular jet stirring device according to a first embodiment of the present invention;

FIG. 4 is a schematic view of a partial structure of a first self-oscillating annular fluidic device according to the present invention;

FIG. 5 is a schematic diagram of a conventional layout of a self-oscillating annular jet stirring system according to a first embodiment of the present invention;

FIG. 6 is a schematic diagram of a second layout of a self-oscillating annular jet mixing system according to a first embodiment of the present invention;

FIG. 7 is a schematic view of a third layout of a self-oscillating annular jet stirring system according to a first embodiment of the present invention;

FIG. 8 is a structural diagram of a self-oscillating annular fluidic device according to a second embodiment of the present invention;

FIG. 9 is a schematic diagram of a self-oscillating annular jet feedback balance state provided by the present invention;

FIG. 10 is a schematic flow diagram of a self-oscillating annular jet provided by the present invention;

FIG. 11 is a schematic view of the internal flow of a self-oscillating annular fluidic system provided by the present invention;

in the figure 1, a water inlet; 2. a water outlet; 3. a main chamber; 4. a left feedback loop; 5. a right feedback loop; 6. a common feedback channel; 7. a jet inlet chamber; 100. a stirred tank housing; 200. a vibration jet flow annular stirring device; 300. a media inlet; 400. a supernatant outlet; 500. a jet fluid line; 600. a diaphragm pressure pump; 700. a medium outlet.

Detailed Description

Example 1

The oscillation jet flow unit (figure 1) is a basic unit of a self-oscillation annular jet flow stirring device (figure 3), and comprises a main chamber 3, a water outlet 2 and a water inlet 1 which are communicated with each other; the main chamber 3 and the respective left 4 and right 5 feedback channels are connected. The oscillating fluidic unit dimensional parameters are shown in figure 2. The ratio of the upper edge to the lower edge of the water inlet (L1: L0) is approximately 1: 3-2: 3, and the included angle between two sides is 60 degrees. The water outlet is a water outlet with the ratio of upper to lower bottom edges (L2: L3) of 1: 5-2: 5 is similar to an isosceles trapezoid, the isosceles trapezoid is connected with the main chamber 3, and the included angle between the two waists is 90 degrees. The ratio of the length L9 of the main cavity from the joint of the water inlet 1 to the joint of the water outlet 2 to the water inlet size L0 is 4: 1-6: 1. The ratio of the width of the constant-section-size part of the main chamber to the water inlet (L6: L0) is 3: 2-2: 1. The ratio of the width of the left feedback channel to the width of the right feedback channel to the water inlet (L4: L0) is 4: 5-5: 4. The water inlet 1, the water outlet 2, the main chamber 3, the left feedback channel 4 and the right feedback channel 5 have the same symmetry axis.

The invention provides a self-oscillation annular jet flow stirring device (figure 3), which is characterized in that a plurality of oscillation jet flow units are uniformly distributed on an annular belt, and the water inlet size L0 is comprehensively determined according to the diameter of a stirring kettle and the number of the oscillation jet flow units. Two

feedback channels

4 and 5 between the main chambers 3 of adjacent oscillation jet units are combined into a common feedback channel 6 (see fig. 4) with the width 1.2 times of the width of the common feedback channel, a closed loop is formed on the annular curved surface to form an oscillation jet annular device of the common feedback channel, and multiple strands of ejected oscillation jets have the same period and phase.

The invention provides a self-oscillation annular jet flow stirring system (figure 5), which mainly comprises a stirring kettle shell 100, an oscillation annular jet flow stirring device 200, a medium inlet 300, a supernatant outlet 400, a jet flow liquid pipeline 500, a diaphragm pressure pump 600 and a medium outlet 700. In the system, a jet inlet pressure cavity 7 is formed by a cover plate and a bottom plate of a reaction kettle shell in the inner side space of the inner annular surface of a self-oscillation annular jet device 200, high-pressure fluid is introduced into the pressure cavity by a jet fluid pipeline 500, and the cavity is used as a water inlet cavity 7 of the jet device. The medium inlet and outlet are connected with external pipeline equipment, and the description of the invention is omitted.

As shown in fig. 5, under the action of the diaphragm pressure pump 600, the supernatant enters the jet inlet pressure chamber 7 from the outlet 400 through the jet liquid pipe 500, and the supernatant is made uniform while being pressurized to enter each oscillating jet unit in the bottom annular jet stirring device 200. The fluid is ejected from each fluidic unit and shows periodic oscillation which is alternately changed clockwise and anticlockwise on the annular cylindrical surface to form a three-dimensional fluidic ring surface. Meanwhile, the fluid in the central area of the three-dimensional jet ring surface is driven by the jet flow of the ring surface to generate jet flow movement with larger scale, and the flow rate of the driven fluid can reach more than 10 times of the flow rate of the jet flow of the ring surface. As for the flow in the jet flow stirring kettle, the jet flow has various movement scales and frequencies, and the vortex system formed in the flow field is complex and has high turbulence, so that the effect of mixing and mass transfer in the flow field is obvious, and the stirring efficiency is improved.

The invention also provides other arrangement conditions of the self-oscillation annular jet stirring system (see figures 6 and 7): the oscillating jet flow annular device in the left middle of the figure 6 is arranged up and down in the stirring kettle. In fig. 7, the oscillating jet annular device is arranged in the middle of the stirring kettle, and the structure of the pressure cavity is an annular tubular shape, which is different from the structure of a jet inlet pressure cavity arranged up and down. The pressure cavity structure can not influence the up-down convection condition in the stirring kettle.

In addition, the jet liquid used by the oscillating jet annular device can be external solution besides the supernatant liquid of the stirring kettle. At this time, the supernatant outlet 400 of the agitation system according to the present invention is connected to an external solution container.

Example 2

The difference between the embodiment 2 and the embodiment 1 is that, as shown in fig. 8, the jet oscillation basic unit structure in the embodiment 2 is not changed, but the annular cylindrical surface formed by a plurality of basic units in the embodiment 1 is changed into a conical surface. The change requires that each basic unit has a certain bending radian and forms a closed ring, and the result is that the jet flow of each basic unit makes clockwise and anticlockwise alternate sweeping flow on the conical surface, so that the intensity of the large-scale jet flow movement in the middle area is enhanced. Meanwhile, the sweeping jet conical surface and the inner wall cylindrical surface of the stirring kettle keep proper space interval, which is beneficial to the kettle internal circulation of large-scale jet motion in the stirring kettle. Applicability is further enhanced.

The principle of the invention is explained in connection with the first embodiment as follows:

the flow principle for the oscillating jet basic unit is described below (see fig. 1): the fluid flows into the stirring device from the water inlet and forms a jet flow after entering the main chamber. Under the action of the Coanda effect, the jet has the possibility of deflecting either the left or the right surface of the main chamber, and the probability of deflecting the left and the right surface is equal. Assuming the jet is deflected towards the left surface of the primary chamber, creating a coanda flow, a small portion of the jet will flow in the primary chamber near the exit to the primary chamber inlet along a feedback loop near the left surface. The small jet (feedback stream) flowing along the feedback loop to the primary chamber inlet location interacts with the primary jet such that the primary jet is deflected away from the primary chamber left surface and in turn deflected towards the primary chamber right surface. Near the main chamber outlet, a small portion of the jet flows along a feedback loop near the right surface to the main chamber inlet, causing the main jet to deflect again toward the main chamber left surface. The process is repeated in cycles, thereby causing periodic pressure oscillations within the main chamber. That is, the main jet flow forms an auxiliary wall flow under the action of the feedback flow and repeatedly changes on the left and right cavity walls. When the main jet flow is ejected from the nozzle, a self-excited oscillation jet flow which repeatedly swings left and right is formed.

For the self-oscillation annular jet device, the self-oscillation annular jet device is composed of a plurality of oscillation jet basic units, is bent and forms a closed ring shape, and feedback loops of adjacent basic units are shared. Therefore, the oscillating jet flows generated by the basic units are not always in a disordered state after a period of time, and gradually tend to a balanced state of 'step by step' due to mutual influence. Two feedback equilibrium states can be achieved for adjacent oscillating jet elementary units, illustrated schematically in fig. 9: one is that the wall flow formed in two adjacent main cavities deviates to the common feedback channel of the two, at this time, two feedback flows are combined in the common feedback channel, and then are separated to enter two cavities, and the main jet flow at the inlet is fed back to push the main jet flow in each cavity to deviate to the other side. I.e. the flow conditions of adjacent cavities are symmetrical about the common feedback channel axis. Then, the left cavity and the adjacent cavity on the left side of the left cavity, and the right cavity and the adjacent cavity on the right side of the right cavity continue to form the same balance state and perform reciprocating circulation; the other is that the coanda flows formed in two adjacent main cavities are deflected to one side of the cavity, at this time, the flows in each main cavity are completely synchronous, the coanda flows to the right side of the main cavity, and the feedback flows through the common feedback channels on the respective right sides and returns to the main jet flow inlet, so that the coanda flow direction gradually changes to the other side. Then, the peripheral wall in each main cavity flows and clings to the left side, and the feedback flows through the common feedback channel on the left side to push the main jet flow to deviate to the right side. And (6) reciprocating and circulating.

Although the oscillating jet annular agitator has two equilibrium states as shown in fig. 9, it is stable only in the second case. In the first feedback balance, two feedback flows enter the same common feedback channel at the same time, are merged and then flow into two flows respectively to the left cavity and the right cavity, and further deflect the main jet flow direction of the main cavity by the momentum of the flows. This requires that the coanda flow is completely synchronous, the feedback flow is completely the same in the distribution process, and the like, and the condition requirement is extremely high, and any asynchronism or inconsistent feedback flow to the respective cavities will break the balance. The first feedback balance is thus an unstable equilibrium state. In the second feedback balance, the auxiliary wall flows in the respective cavities can be allowed to have certain phase difference and feedback flow difference, the feedback balance cannot be changed immediately in a certain range, the feedback can still evolve according to the original oscillation jet flow rule, and certain fault tolerance is achieved. And thus is a stable equilibrium state. That is, each jet outlet on the oscillating jet ring device can maintain a stable balance state, the jet direction changes clockwise and anticlockwise alternately, and oscillating jets which change synchronously and periodically are formed on the ring-shaped cylindrical surface. (see FIG. 10)

Meanwhile, when the three-dimensional annular jet flow is generated, a negative pressure area is generated on the annular cylindrical surface/conical surface where the jet flow moves, the surrounding solution is continuously involved into the jet flow to move, and large-scale jet flow movement is generated in the center of the annular device. The jet flow moves to meet the upper end face and the lower end face of the stirring kettle, and then flows back to the area generated by the annular jet flow along the wall surface of the stirring kettle, so that the internal circulation of the stirring kettle is completed. (see FIG. 11)

In view of this, each basic jet unit in the self-excited oscillation annular jet stirring device generates synchronously oscillating jet, and three-dimensional annular jet which periodically oscillates is generated on an annular cylindrical surface/conical surface of the jet device. Meanwhile, inside the annular jet, the large-scale jet motion with more than 10 times of annular jet flow is formed by driving. In the jet flow stirring kettle, the jet flow motion scale is various, the frequency is changeable, the vortex system formed in the flow field is complex and the turbulence degree is large, so that the flow field mixing and mass transfer effect is obvious, and the jet flow stirring efficiency is further improved.

The invention is not the best known technology. The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A self-oscillation annular jet stirring system is characterized in that: including stirred tank casing (100), vibrate efflux annular agitating unit (200), medium entry (300), upper clear liquid export (400), efflux liquid pipeline (500), diaphragm force pump (600) and medium export (700), it sets up in stirred tank casing (100) to vibrate efflux annular agitating unit (200), stirred tank casing (100) top sets up medium entry (300), stirred tank casing (100) upper portion one side sets up upper clear liquid export (400), stirred tank casing (100) lower part sets up medium export (700), upper clear liquid export (400) are through diaphragm force pump (600) and efflux liquid pipeline (500) and the access connection who vibrates efflux annular agitating unit (200).

2. A self-oscillating annular jet mixing system according to claim 1, wherein: the oscillation jet flow annular stirring device (200) comprises a closed annular device formed by bending and arranging a plurality of oscillation jet flow basic units side by side, and adjacent oscillation jet flow basic units share a feedback channel.

3. A self-oscillating annular jet mixing system according to claim 2, wherein: the basic unit of the oscillating jet flow comprises a main cavity (3), a water inlet (1) and a water outlet (2) are respectively arranged at the upper end and the lower end of the main cavity (3), and each main cavity (3) is provided with a left feedback channel (4) and a right feedback channel (5) which are communicated with the main cavity; the cross-sectional area of the main cavity (3) is larger than that of the left feedback channel (4) and the right feedback channel (5), and the left feedback channel (4) and the right feedback channel (5) of two adjacent main cavities (3) are combined to form a side-by-side feedback channel.

4. A self-oscillating annular jet mixing system according to claim 3, wherein: the section shape of the main chamber (3) adopts a structure which is gradually enlarged from the water inlet (1) to the water outlet (2).

5. A self-oscillating annular jet mixing system according to claim 4, wherein: the section specification of the left feedback channel (4) is the same as that of the right feedback channel (5).

6. A self-oscillating annular jet mixing system according to claim 5, wherein: the cross-sectional dimension of the inlet end of the water inlet (1) is larger than that of the outlet end; the cross section size of the inlet end of the water outlet (2) is smaller than that of the outlet end.

7. A self-oscillating annular jet mixing system according to claim 6, wherein: the water inlets (1) corresponding to the main cavities (3) are connected with the same water inlet cavity (6).

8. A self-oscillating annular jet mixing system according to claim 7, wherein: the two feedback channels between the adjacent main chambers (3) are combined into one feedback channel with the width being 0.8-1.2 times of the width of the feedback channel.

9. A self-oscillating annular jet mixing system according to claim 8, wherein: the outer diameters of the oscillating jet flow annular stirring device (200) and the stirring kettle shell (100) are arranged in concentric circles; the jet flow direction of each jet flow outlet on the oscillating jet flow annular stirring device (200) is vertical to the circular plane of the jet flow device, or forms an acute angle with the circular plane of the jet flow device and points to the central shaft of the stirring kettle.

10. A method of using a self-oscillating annular jet mixing system according to claim 9, wherein: the solution to be stirred enters a stirring kettle shell (100) from a medium inlet (300) and flows out of the stirring kettle from a medium outlet (700), under the action of a diaphragm pressure pump (600), clear liquid on the upper part of the shell enters a jet liquid pipeline (500) from a supernatant outlet (400), and is pressurized by the pump and then sent into a jet inlet pressure cavity (7) positioned at the bottom/upper part/middle part of the stirring kettle; the jet fluid in the water inlet cavity (7) enters the bottom jet stirring device (200) through a plurality of water inlets (1), and water outlets (2) corresponding to a plurality of main cavities (3) form annular jet flows which synchronously and alternately swing in the clockwise direction or the anticlockwise direction on the annular cylindrical surface/conical surface; the annular jet flow generated by the oscillation jet flow annular device (200) drives the fluid in the central area of the stirring kettle to generate large-scale jet flow motion, and the fluid flows back to the jet flow generation area along the wall surface of the stirring kettle when meeting the end part of the stirring kettle, so that the circulating flow in the stirring kettle is completed.