Efficient mixing and uniform distribution device based on mixed liquid backstepping

Abstract

The invention discloses an efficient mixing and uniform distribution device based on mixed liquid backstepping, which relates to the technical field of fluid mixing equipment, and comprises a mixing container and a Venturi flow mixer, the Venturi flow mixer is provided with a fluid inlet used for being communicated with the mixing container, a gas inlet used for medium gas to enter and a premixing outlet used for discharging gas-liquid mixed liquid into the mixing container. The premixing outlet is communicated with an aeration reverse thrust blade assembly, and a plurality of jet holes are formed in the aeration reverse thrust blade assembly; through cooperation of the Venturi flow mixer and the aeration reverse thrust blade assembly, stirring is driven by reverse thrust of mixed liquid injection, motor and mechanical transmission is not needed, the energy conversion efficiency is improved, and the energy consumption is reduced; through triple effects of Venturi premixing, stirring blade throwing and jet disturbance, the contact area of gas-liquid mixed liquid and materials in the container is enlarged, the mixing dead angle is reduced, and the mixing uniformity is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluid mixing devices, and particularly relates to a high-efficiency mixing and uniform distribution device based on mixed liquid back-pushing. BACKGROUND

[0002] In industrial production, fluid mixing (especially gas-liquid mixing) is a common unit operation and is widely used in sewage treatment aeration, biological fermentation, chemical reaction and the like. Traditional mixing devices usually rely on motor-driven stirring paddles to realize material stirring through mechanical transmission. For example, a surface aerator (such as a rotating brush aerator) or a forced air aeration system (a microporous aerator + a fan) is used. The surface aerator drives the rotating brush to rotate at a high speed by a motor, throws the liquid into the air to form a water curtain, and increases the gas-liquid contact area. In the forced air aeration system, the fan compresses and delivers air to the microporous aerator through mechanical transmission, and the gas escapes in the form of small bubbles, thereby prolonging the gas-liquid contact time.

[0003] However, due to the low power transmission efficiency of the motor, the mixing effect is good near the stirring paddle, but a mixing dead angle is easily formed in the area far away from the paddle, thereby causing uneven distribution of the material. SUMMARY

[0004] The application aims to provide a high-efficiency mixing and uniform distribution device based on mixed liquid back-pushing, which does not need an additional complex transmission mechanism, realizes high-efficiency mixing through the energy of the fluid itself, and significantly improves the material mixing uniformity and energy utilization efficiency, so as to solve the problems in the background.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] A high-efficiency mixing and uniform distribution device based on mixed liquid back-pushing comprises a mixing container and a Venturi flow mixer, a fluid inlet for communication with the mixing container, a gas inlet for medium gas entering, and a premixing outlet for discharging the gas-liquid mixture into the mixing container are arranged on the Venturi flow mixer.

[0007] The premixing outlet is communicated with an aeration back-pushing blade assembly, a plurality of injection holes are arranged on the aeration back-pushing blade assembly, the aeration back-pushing blade is rotationally connected inside the mixing container through a support assembly, and the injection holes are stirred and mixed by the back-pushing force generated by the injection of the gas-liquid mixture.

[0008] A one-way valve for preventing the gas-liquid mixture from flowing back into the gas pipeline is installed on the pipeline communicated with the mixing container.

[0009] Preferably, the aeration reverse pushing blade assembly comprises a connecting shaft, the outer wall of the connecting shaft is fixed with a plurality of stirring blades at equal angles, the connecting shaft is rotatably connected with the bottom of the mixing container and the premixing outlet through a support assembly, the connecting shaft is provided with a second flow channel communicated with the premixing outlet, the stirring blade is provided with a first flow channel communicated with the second flow channel, and the injection hole is communicated with the inside of the first flow channel.

[0010] Preferably, the plurality of injection holes are uniformly distributed on the stirring blade, the outlet direction of the injection hole forms an inclination angle of 15-45° with the rotation plane of the stirring blade, and the phase difference of the injection holes of two adjacent stirring blades is 60-120°.

[0011] Preferably, the support assembly comprises a bottom bearing and an intermediate bearing, the lower end of the connecting shaft is rotatably connected with the inner bottom of the mixing container through the bottom bearing, the upper end of the connecting shaft is communicated with the premixing outlet through a connecting mechanism, and the intermediate bearing is sleeved on the outside of the connecting shaft and rotatably connected with the connecting mechanism, so that the connecting shaft can drive the stirring blade to rotate.

[0012] Preferably, the bottom bearing and the intermediate bearing are made of self-lubricating wear-resistant materials, and the outer rings of the bottom bearing and the intermediate bearing are provided with sealing elements for preventing materials from entering the bearing gap.

[0013] Preferably, the connecting mechanism comprises a connecting flange and a mounting flange, the connecting flange is fixed at the connection between the Venturi flow mixer and the external pipeline, the mounting flange is sleeved on the outside of the intermediate bearing, the mechanical sealing mechanism is installed between the mounting flange and the connecting flange, and the mounting flange and the connecting flange are connected through bolts.

[0014] Preferably, the mechanical sealing element comprises a static ring fixed with the premixing outlet and a dynamic ring rotating with the connecting shaft, the sealing rings are embedded between the dynamic ring and the connecting shaft and between the static ring and the premixing outlet, and the dynamic ring rotates on the static ring.

[0015] Preferably, the ratio of the throat diameter to the inlet diameter of the Venturi flow mixer is 0.3-0.6, and the throat is provided with a gas injection channel communicated with the gas inlet.

[0016] Preferably, the inlet diameter of the Venturi flow mixer is 50 mm, the throat diameter is 20 mm, the cone angle of the diffusion section is 15°, the gas inlet diameter is 10 mm, and the adaptive liquid flow rate is 10-20 m³ / h.

[0017] Preferably, the one-way valve is a spring type one-way valve, and the opening pressure of the one-way valve is 0.02 MPa±0.005 MPa.

[0018] The high-efficiency mixing and uniform distribution device based on mixed liquid back-pushing has the following advantages compared with the prior art.

[0019] 1、The Venturi mixer and the aeration back-pushing blade assembly are matched, the back-pushing force of the mixed liquid is used to drive stirring, the motor and mechanical transmission are not needed, the energy conversion efficiency is improved, the energy consumption is reduced, the vulnerable parts such as gears and motors are reduced, and the maintenance cost is reduced.

[0020] 2、The Venturi premixing, the stirring blade throwing and the jet disturbance triple action are used to expand the contact area of the gas-liquid mixed liquid and the materials in the container, reduce the mixing dead angle and improve the uniformity of mixing.

[0021] 3、The Venturi mixer size, the blade jet hole angle and the number can be adjusted to adapt to the mixing requirements of different viscosity materials. DETAILED DESCRIPTION

[0022] Fig. 1 is a structural schematic view of the present application;

[0023] Fig. 2 is a structural schematic view of the aeration back-pushing blade assembly of the present application;

[0024] Fig. 3 is a sectional structural schematic view of the support assembly of the present application;

[0025] In the figure: 1, mixing container;2, Venturi mixer;3, one-way valve;4, aeration back-pushing blade assembly;41, stirring blade;42, connecting shaft;43, jet hole;44, first flow channel;45, second flow channel;5, bottom bearing;6, support assembly;61, connecting flange;62, mechanical sealing mechanism;621, static ring;622, dynamic ring;63, intermediate bearing;64, mounting flange. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. The specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] The present application provides a method for preparing a compound of formula (I) Figs. 1-3The device for efficient mixing and uniform distribution based on mixed liquid backstepping includes a mixing container 1 and a Venturi mixer 2, wherein the Venturi mixer 2 is provided with a fluid inlet for communicating with the mixing container 1, a gas inlet for medium gas entering, and a premixing outlet for discharging the gas-liquid mixture into the mixing container 1.

[0028] The Venturi mixer 2 is a liquid mixing device designed based on the Venturi effect, which realizes efficient mixing of two or more fluids through a special pipeline structure, including a converging section, a throat section, and a diverging section. The converging section is a pipeline through which the fluid enters from the inlet and gradually narrows, the flow rate increases, and the pressure decreases. The throat section is the narrowest part of the pipeline, where the pressure is the lowest, forming a negative pressure zone. At this time, if another fluid is introduced, it will be sucked in and mixed at high speed due to the negative pressure. The diverging section is the pipeline where the mixed fluid enters and gradually expands, the flow rate slows down, the pressure recovers, and the mixing process is completed. Through the dynamic changes of flow rate and pressure, passive mixing without mechanical stirring is realized.

[0029] During premixing, when the liquid flows into the throat section at high speed from the inlet, the throat section forms a negative pressure, and gas such as air or reaction gas is automatically sucked in through the gas inlet. The liquid and gas are fully sheared and mixed in the throat section and the diverging section, forming a preliminary uniform gas-liquid mixture. This structure does not require external gas delivery power, improving the efficiency of gas-liquid premixing.

[0030] A plurality of the injection holes 43 are uniformly distributed on the stirring blades 41, and the outlet direction of the injection holes 43 forms an inclination angle of 15-45° with the rotation plane of the stirring blades 41. The phase difference between the injection holes 43 of adjacent two stirring blades 41 is 60-120°. The ratio of the throat diameter to the inlet diameter of the Venturi mixer 2 is 0.3-0.6, and a gas injection channel is arranged at the throat section, which communicates with the gas inlet.

[0031] For example, the inlet diameter of the Venturi mixer 2 is 50 mm, the throat diameter is 20 mm, the ratio of the inlet diameter to the throat diameter is 2.5, the diverging section cone angle is 15°, the gas inlet diameter is 10 mm, and the suitable liquid flow rate is 10-20 m 3 / h.

[0032] The premixing outlet is communicated with an aeration backstepping blade assembly 4, which is provided with a plurality of injection holes 43. The aeration backstepping blade is rotationally connected inside the mixing container 1 through a support assembly 6. The injection holes 43 generate backstepping force for stirring through the injection of gas-liquid mixture. The backstepping force of the mixed liquid injection drives the stirring without the need for a motor and mechanical transmission, improving energy conversion efficiency and reducing energy consumption. Meanwhile, the number of vulnerable components such as gears and motors is reduced, and the maintenance cost is reduced.

[0033] A one-way valve 3 is installed on the pipeline through which the gas inlet communicates with the mixing container 1, which prevents the reverse flow of gas-liquid mixture into the gas pipeline. The one-way valve 3 is a spring type one-way valve, and the opening pressure of the one-way valve 3 is 0.02 MPa ± 0.005 MPa, which prevents the reverse flow of gas-liquid mixture to the gas source system and protects the gas supply equipment.

[0034] The aeration counter-propulsion blade assembly 4 includes a connecting shaft 42, the outer wall of which is fixed at equal angles with a plurality of stirring blades 41, the connecting shaft 42 is rotatably connected with the bottom of the mixing container 1 and the premixing outlet through a support assembly 6, the connecting shaft 42 is provided with a second flow channel 45 communicating with the premixing outlet, and the stirring blade 41 is provided with a first flow channel 44 communicating with the second flow channel 45. The injection hole 43 communicates with the inside of the first flow channel 44. When the gas-liquid mixture is sprayed at high speed from the injection hole 43 through the flow channel, according to the principle of momentum conservation, a counter-propulsion force will be generated on the surface of the stirring blade 41, which drives the whole aeration counter-propulsion blade assembly 4 to rotate around the connecting shaft 42. At the same time, the high-speed sprayed gas-liquid mixture will form a strong disturbance to the surrounding materials, further enhancing the stirring effect, and the rotating stirring blade 41 can uniformly spread the gas-liquid mixture to all areas of the mixing container 1, avoiding dead angles.

[0035] For example, the aeration counter-propulsion blade assembly 4 adopts three stirring blades 41, which are uniformly distributed along the circumference of the connecting shaft 42, the included angle between adjacent two stirring blades 41 is 120°, the length of the blade is 300mm, the diameter of the injection hole 43 is 8mm, four injection holes 43 are arranged on each stirring blade 41, the included angle between the axis of the injection hole 43 and the tangent direction of the stirring blade is 30°, which ensures that the counter-propulsion force is uniform and the rotation is stable.

[0036] The support assembly 6 includes a bottom bearing 5 and an intermediate bearing 63, the lower end of the connecting shaft 42 is rotatably connected with the inner bottom of the mixing container 1 through the bottom bearing 5, the upper end of the connecting shaft 42 is connected with the premixing outlet through a connecting mechanism, and the intermediate bearing 63 is sleeved on the outside of the connecting shaft 42 and is rotatably connected with the connecting mechanism, so that the connecting shaft 42 can drive the stirring blade 41 to rotate, and the radial displacement of the stirring blade 41 is limited by the bottom bearing 5 and the intermediate bearing 63, which ensures the stability of rotation and reduces the friction resistance.

[0037] The bottom bearing 5 and the intermediate bearing 63 are made of self-lubricating wear-resistant materials, and the outer rings of the bottom bearing 5 and the intermediate bearing 63 are provided with sealing elements for preventing materials from entering the bearing gap. The bottom bearing 5 and the intermediate bearing 63 are made of polytetrafluoroethylene material, which has self-lubricating and corrosion-resistant properties, and is suitable for complex media such as sewage.

[0038] The connecting mechanism comprises a connecting flange 61 fixed at the connection of the Venturi flow mixer 2 and an external pipeline and a mounting flange 64 sleeved outside the intermediate bearing 63, the mechanical sealing mechanism 62 is mounted between the mounting flange 64 and the connecting flange 61, and the mounting flange 64 and the connecting flange 61 are connected through bolts, the connecting flange 61 and the mounting flange 64 adopt a DN80 standard flange, which is convenient for connection with the mixing container 1 or the external pipeline and guarantees the sealing property of the overall installation of the device.

[0039] The mechanical sealing mechanism comprises a static ring 621 fixed at the premixing outlet and a dynamic ring 622 rotating with the connecting shaft 42, sealing rings are embedded between the dynamic ring 622 and the connecting shaft 42 and between the static ring 621 and the premixing outlet, and the dynamic ring 622 rotates on the static ring 621, and the sealing rings increase the sealing property between the dynamic ring 622 and the connecting shaft 42 and between the static ring 621 and the premixing outlet.

[0040] In use, liquid (such as sewage) is pumped from the inlet of the Venturi flow mixer 2, air is sucked in when the liquid flows at high speed through the throat, and gas-liquid mixed liquid is formed in the diffusion section, the gas-liquid mixed liquid enters the second flow channel 45 of the aeration reverse thrust vane assembly 4 through the pipeline, is then sprayed at high speed from the jet holes 43 through the first flow channel 44, and the reverse thrust drives the stirring vane 41 to rotate at a speed of 30-60 r / min, the rotating stirring vane 41 uniformly throws the gas-liquid mixed liquid to all parts of the mixing container 1, and simultaneously stirs the material, so that the gas-liquid mixed liquid fully contacts and diffuses with the material in the mixing container 1, high-efficiency mixing and uniform distribution are realized, the gas-liquid mixing and reverse thrust are ingeniously combined through the cooperation of the Venturi flow mixer 2 and the aeration reverse thrust vane assembly 4, the technical limitations of traditional stirring equipment are broken through, and remarkable advantages are achieved in aspects of improving mixing efficiency, reducing energy consumption and simplifying structure, and the mixing requirements of different viscosity materials (such as sewage, fermentation liquid and slurry) can be met by adjusting the size of the Venturi flow mixer 2, the angle and number of the vane jet holes 43.

[0041] When the high-efficiency mixing and uniform distribution device is applied in a sewage treatment aeration tank, compared with traditional aeration stirring equipment, the uniformity of dissolved oxygen is improved by 40%, energy consumption is reduced by 25%, and there is no wear problem of mechanical transmission components, so that the service life of the equipment is prolonged.

[0042] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A highly efficient mixing and uniform distribution device based on liquid back-propagation, characterized in that: It includes a mixing container (1) and a Venturi mixer (2), wherein the Venturi mixer (2) is provided with a fluid inlet for communicating with the mixing container (1), a gas inlet for the medium gas to enter, and a premixing outlet for discharging the gas-liquid mixture into the mixing container (1); The premix outlet is connected to an aeration back thrust blade assembly (4), which is provided with a number of injection holes (43). The aeration back thrust blade is rotatably connected to the inside of the mixing container (1) through a support assembly (6). The injection holes (43) generate back thrust through the injection of gas-liquid mixture to stir and mix. A one-way valve (3) is installed on the pipe connecting the gas inlet and the mixing container (1) to prevent the gas-liquid mixture from flowing back into the gas pipe.

2. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 1, characterized in that: The aeration back thrust blade assembly (4) includes a connecting shaft (42), and multiple stirring blades (41) are fixed at equal angles on the outer wall of the connecting shaft (42). The connecting shaft (42) is rotatably connected to the bottom of the mixing container (1) and the premix outlet through the support assembly (6). A second flow channel (45) communicating with the premix outlet is provided inside the connecting shaft (42). A first flow channel (44) communicating with the second flow channel (45) is provided inside the stirring blades (41). The injection hole (43) is connected to the interior of the first flow channel (44).

3. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 2, characterized in that: Multiple injection holes (43) are evenly distributed on the stirring blade (41), and the outlet direction of the injection holes (43) is at an angle of 15-45° to the plane of rotation of the stirring blade (41), and the phase difference between the injection holes (43) of two adjacent stirring blades (41) is 60-120°.

4. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 3, characterized in that: The support assembly (6) includes a bottom bearing (5) and an intermediate bearing (63). The lower end of the connecting shaft (42) is rotatably connected to the bottom of the mixing container (1) through the bottom bearing (5). The upper end of the connecting shaft (42) is connected to the premix outlet through a connecting mechanism. The intermediate bearing (63) is sleeved on the outside of the connecting shaft (42) and rotatably connected to the connecting mechanism, so that the connecting shaft (42) can drive the stirring blade (41) to rotate.

5. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 4, characterized in that: Both the bottom bearing (5) and the intermediate bearing (63) are made of self-lubricating wear-resistant material, and the outer rings of the bottom bearing (5) and the intermediate bearing (63) are provided with seals to prevent material from entering the bearing gap.

6. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 5, characterized in that: The connection mechanism includes a connecting flange (61) and a mounting flange (64). The connecting flange (61) is fixed at the connection between the Venturi mixer (2) and the external pipe. The mounting flange (64) is sleeved on the outside of the intermediate bearing (63). The mechanical seal mechanism (62) is installed between the mounting flange (64) and the connecting flange (61). The mounting flange (64) and the connecting flange (61) are connected by bolts.

7. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 6, characterized in that: The mechanical seal includes a stationary ring (621) fixed to the premix outlet and a rotating ring (622) that rotates with the connecting shaft (42). Sealing rings are embedded between the rotating ring (622) and the connecting shaft (42) and between the stationary ring (621) and the premix outlet. The rotating ring (622) rotates on the stationary ring (621).

8. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 1, characterized in that: The ratio of the throat diameter to the inlet diameter of the Venturi mixer (2) is 0.3-0.6, and a gas ejection channel is provided at the throat, which is connected to the gas inlet.

9. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 8, characterized in that: The Venturi mixer (2) has an inlet diameter of 50 mm, a throat diameter of 20 mm, a diffuser cone angle of 15°, a gas inlet diameter of 10 mm, and is suitable for liquid flow rates of 10-20 m³ / h.

10. The efficient mixing and uniform distribution device based on liquid back-propagation according to claim 1, characterized in that: The one-way valve (3) is a spring-loaded one-way valve, and the opening pressure of the one-way valve (3) is 0.02MPa±0.005MPa.

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