High-stability acidification stirring tank

Abstract

The utility model discloses a high-stability acidification stirring tank, which belongs to the technical field of industrial equipment and comprises an outer tank, an inner tank is arranged in the outer tank, pneumatic membranes are uniformly arranged between the outer tank and the inner tank, pneumatic membranes distributed in an annular array are arranged between the outer tank and the inner tank, and ventilation blocks are arranged among the pneumatic membranes. The inflatable membranes are circumferentially and evenly connected at intervals through the ventilation blocks to form a closed annular buffer structure surrounding the outer side of the inner groove, ventilation holes are evenly formed in the ventilation blocks, the adjacent inflatable membranes are communicated through the ventilation holes, limiting assemblies are arranged between the inflatable membranes and the outer groove and between the inflatable membranes and the inner groove, and inflation nozzles are arranged at the bottoms of the inflatable membranes. During stirring, vibration is transmitted through the inner tank and buffered through the inflatable membrane between the inner tank and the outer tank, vibration energy is dissipated and transmission is weakened by means of compressibility of gas in the inflatable membrane, the ventilation block and the ventilation hole are communicated with the inflatable membrane, pressure is balanced, buffering rigidity is dynamically adjusted, vibration is effectively restrained, and stable operation of the stirring tank is guaranteed.

Description

Technical Field

[0001] This utility model relates to a mixing tank, and more particularly to a highly stable acidification mixing tank, belonging to the field of industrial equipment technology. Background Technology

[0002] In the prior art, such as the utility model with application number 201810599444.X, a stirring tank is disclosed. A baffle is set in the tank body and located on the outer periphery of the stirring shaft. The baffle has a flow-through hole and the cross-section of the baffle is wavy. During the stirring process of the impeller, the fluid will form many high-speed jets after passing through the flow-through hole. Since the cross-section of the baffle is wavy, the high-speed jets will also collide with each other after passing through the baffle to form an impact flow, thereby further increasing the velocity gradient of the fluid in the baffle area of ​​the stirring tank, improving the flow condition of the dead zone between the baffle and the inner wall of the tank, improving the mixing effect of the fluid, and improving the stirring efficiency of the stirring tank.

[0003] The above-mentioned applications still have shortcomings:

[0004] The wave-shaped flow-through baffle mixing tank of this patent has stability defects. High-speed mixing is prone to instability due to vibration or resonance. The wave-shaped baffle and flow-through holes cause asymmetric fluid load and pressure pulsation, which exacerbates the vibration risk. Vibration can lead to structural fatigue and sealing failure, especially in acidification mixing tanks, resulting in media leakage and efficiency reduction, increasing safety risks, and even causing equipment damage and accidents.

[0005] To address these issues, a highly stable acidification mixing tank was designed. Utility Model Content

[0006] The main objective of this invention is to provide a highly stable acidification stirring tank to solve the problems mentioned in the background art.

[0007] The objective of this utility model can be achieved by adopting the following technical solution:

[0008] A highly stable acidification stirring tank includes an outer tank and an inner tank inside the outer tank. An air-filled membrane is uniformly arranged between the outer and inner tanks. An air-filled membrane arranged in a ring array is arranged between the outer and inner tanks. An air exchange block is arranged between each air-filled membrane, and the air-filled membranes are connected circumferentially at uniform intervals through the air exchange blocks to form a closed ring-shaped buffer structure surrounding the outer side of the inner tank. Air exchange holes are uniformly opened on the air exchange blocks, and adjacent air-filled membranes are connected through the air exchange holes. Limiting components are provided between the air-filled membranes and the outer and inner tanks. An air inlet is provided at the bottom of the air-filled membrane. A motor is installed at the top of the inner tank, and a stirring shaft is fixed to the output shaft of the motor. Stirring blades are uniformly arranged at the bottom end of the stirring shaft. A fixing ring is fitted on the outer side of the top of the outer tank, and an installation ring is fitted on the outer side of the top of the inner tank and above the fixing ring. Bolts are uniformly installed between the installation ring and the fixing ring.

[0009] Preferably, the limiting component includes limiting strips and limiting grooves. The limiting strips are evenly disposed on the inner and outer sides of the inflatable membrane, and the limiting grooves are evenly disposed on the inner side of the outer groove and the outer side of the inner groove, and the shape of the limiting grooves matches that of the limiting strips.

[0010] Preferably, the inner side of the inner groove is provided with a spiral strip, and the outer side of the spiral strip is set as an arc surface.

[0011] Preferably, the inflatable membrane is made of fluororubber, and the outer side of the inflatable membrane is uniformly provided with anti-slip texture.

[0012] Preferably, the inflatable membrane is made of fluororubber, and the outer side of the inflatable membrane is uniformly provided with anti-slip texture.

[0013] Preferably, the spiral strips are evenly distributed along the axial direction of the stirring shaft, with a spacing error of ±0.5mm.

[0014] Preferably, the stirring shaft and the stirring blade are respectively made of stainless steel alloy shaft and stainless steel alloy blade.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model utilizes the combined use of an outer tank, an inner tank, an air-filled membrane, an air exchange block, an air exchange hole, a motor, a stirring shaft, stirring blades, and an air inlet. During stirring, vibration is transmitted through the inner tank and buffered by the air-filled membrane between the inner and outer tanks. The compressibility of the gas in the air-filled membrane dissipates the vibration energy, weakening the transmission. The air exchange block and the air exchange hole are connected to the air-filled membrane, balancing the pressure and dynamically adjusting the buffer stiffness, effectively suppressing vibration and ensuring the stable operation of the stirring tank.

[0017] 2. This utility model uses a combination of limiting strips, limiting grooves, mounting rings, fixing rings and bolts for easy installation and disassembly. The limiting strips and limiting grooves are aligned by engaging, eliminating the need for complicated operations, saving time and effort. The structure is stable and reliable, making it convenient for the maintenance and installation of inflatable membranes. Attached Figure Description

[0018] Figure 1 This is a front sectional view of the present invention;

[0019] Figure 2 This is a cross-sectional view of the inflatable membrane of this utility model;

[0020] Figure 3 This is a top view of the inner and outer grooves of this utility model;

[0021] Figure 4 This is a schematic diagram showing the connection between the inflatable membrane and the air exchange block of this utility model.

[0022] In the diagram: 1. Outer tank; 2. Inner tank; 3. Inflatable membrane; 4. Air exchange block; 5. Air exchange hole; 6. Motor; 7. Stirring shaft; 8. Stirring blade; 9. Limiting component; 901. Limiting strip; 902. Limiting groove; 10. Mounting ring; 11. Fixing ring; 12. Bolt; 13. Spiral strip; 14. Air inlet. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0024] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0025] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Example 1

[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment proposes a highly stable acidification stirring tank, including an outer tank 1, an inner tank 2 inside the outer tank 1, and an air-filled membrane 3 uniformly arranged between the outer tank 1 and the inner tank 2. The air-filled membrane 3 is filled with dry nitrogen gas for moisture and oxidation prevention. The stiffness coefficient of the air-filled membrane 3 is 60 N / mm, and it can absorb vibration energy with a frequency of 10-50 Hz. According to vibration table testing, the vibration amplitude of the inner tank 2 can be reduced by more than 60%. The air-filled membranes 3 are arranged in a ring array between the outer tank 1 and the inner tank 2. Each air-filled membrane 3 is provided with a ventilation block 4, and the air-filled membranes 3 are connected circumferentially at uniform intervals through the ventilation blocks 4 to form a closed ring-shaped buffer structure around the outer side of the inner tank 2. Ventilation holes 5 are uniformly opened on the ventilation blocks 4, and adjacent air-filled membranes 3 are connected through the ventilation holes 5. Limiting components 9 are provided between the air-filled membranes 3 and the outer tank 1 and the inner tank 2. The bottom of the air-filled membrane 3 is provided with a filling device. The air nozzle 14 is installed on the top of the inner tank 2. The motor 6 is fixed to the output shaft of the motor 6. The motor 6 is made of 2205 duplex stainless steel GB / T24511-2017 "Stainless Steel and Heat-Resistant Steel Plates and Strips for Pressure Equipment", with a yield strength ≥450MPa and a pitting corrosion resistance index PREN ≥32. It is suitable for environments with Cl⁻ concentration ≤2000ppm. The bottom end of the stirring shaft 7 is uniformly provided with stirring blades 8. The stirring blades 8 are integrally cast 2507 super duplex steel PREN ≥40 with a blade thickness of 10mm and a rounded edge R5mm to reduce stress concentration. It conforms to JB / T6886-2013 "Agitators". The outer side of the top of the outer tank 1 is fitted with a fixing ring 11. The outer side of the top of the inner tank 2 and above the fixing ring 11 is fitted with an installation ring 10. Bolts 12 are uniformly installed between the installation ring 10 and the fixing ring 11.

[0030] When the stirring shaft 7 and the stirring blades 8 rotate and stir in the inner tank 2, the dynamic interaction between the stirring blades 8 and the material generates mechanical vibration, forming a periodic load that is transmitted to the inner tank 2. The air-filled membrane 3 between the inner tank 2 and the outer tank 1 utilizes the compressibility of gas to deform during vibration impact, compressing or expanding the gas and converting the mechanical energy of vibration into the internal energy of the gas, thus dissipating energy and weakening the transmission of vibration. The air exchange blocks 4 and air exchange holes 5 between adjacent air-filled membranes 3 form a gas communication channel. When the air-filled membrane 3 in a certain area is impacted, causing a sudden pressure change, the gas will flow through the air exchange blocks 4 and air exchange holes 5 to the air-filled membranes 3 in other areas, balancing the pressure distribution, dynamically adjusting the buffer stiffness of each part, further suppressing the vibration response of the inner tank 2, weakening the vibration, and ensuring the stable operation of the mixing tank.

[0031] Example 2

[0032] The solution in Example 1 will be further described below with reference to its specific working method.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in a preferred embodiment, based on the above method, the limiting component 9 further includes a limiting strip 901 and a limiting groove 902. The limiting strip 901 is evenly disposed on the inner side (the side in contact with the inner groove 2) and the outer side (the side in contact with the outer groove 1) of the inflatable membrane 3. The limiting strip 901 has a T-shaped cross section. The limiting groove 902 is evenly opened on the inner side of the outer groove 1 and the outer side of the inner groove 2. The limiting groove 902 matches the shape of the limiting strip 901. The limiting groove 902 is a T-shaped groove.

[0034] After removing the bolts 12 between the mounting ring 10 and the fixing ring 11, the inflatable membrane 3 is taken out from between the outer groove 1 and the inner groove 2. The inflatable membrane 3 drives the limiting strip 901 to move upward along the inside of the limiting groove 902 until the inflatable membrane 3 is separated from between the outer groove 1 and the inner groove 2. During installation, the inflatable membrane 3 is placed between the outer groove 1 and the inner groove 2. At the same time, the limiting strips 901 on the inner and outer sides of the inflatable membrane 3 are aligned with the limiting grooves 902 on the outer groove 1 and the inner groove 2, and are engaged into the limiting grooves 902 by the limiting strips 901, thus completing the installation of the inflatable membrane 3 between the outer groove 1 and the inner groove 2.

[0035] like Figure 1 As shown, in a preferred embodiment, based on the above method, a spiral strip 13 is further provided on the inner side of the inner tank 2. The spiral angle of 35° is optimized by CFD simulation. At this angle, the axial flow velocity of the material is 1.0 m / s and the circumferential flow velocity is 2.0 m / s. The mixing efficiency is 15% higher than that of the traditional 45° spiral angle. The outer side of the spiral strip 13 is set as an arc surface. The radius of curvature of the outer arc surface is 25 mm, which forms a 1:20 ratio with the radius of the inner wall of the inner tank 2 of 500 mm. This reduces the energy consumption of material impact and meets the requirements of JB / T2640-2014 "Technical Conditions for Mixing Equipment". The roughness of the arc surface is Ra≤0.8μm after electrolytic polishing. The weld is subjected to penetrant testing in accordance with the first-level standard of JB / T6064-2006 "Non-destructive Testing Penetrant Testing" to avoid material retention and corrosion.

[0036] With its special geometric structure, the spiral strip 13 guides the material to make axial and circumferential compound motion along the spiral path under the drive of the stirring shaft 7 and the stirring blade 8, reducing mechanical vibration caused by uneven flow field. The arc surface of the spiral strip 13 can reduce the flow resistance of the material, avoid dead corners in the flow channel, and make the flow smoother.

[0037] like Figure 1 As shown, in a preferred embodiment, based on the above method, the inflatable membrane 3 is further made of fluororubber, using DuPont Viton A fluororubber, the preferred material in the industry for strong acid resistance, resistant to 98% concentrated sulfuric acid corrosion, and conforming to HG / T3089-2017 "Technical Conditions for Corrosion-Resistant Rubber Products". The membrane thickness is 3mm, a conventional thickness for industrial rubber membranes, balancing elasticity and strength, and the outer side of the inflatable membrane 3 is uniformly provided with anti-slip texture.

[0038] Fluororubber exhibits excellent resistance to strong acids such as concentrated sulfuric acid and strong alkalis such as sodium hydroxide. It also possesses good mechanical strength and anti-aging properties. The anti-slip texture and the stable air membrane effectively buffer vibrations, enhancing the overall structural stability.

[0039] like Figure 1 and 3 As shown, in a preferred embodiment, based on the above method, a sealing gasket is further provided at the engagement point between the limiting strip 901 and the limiting groove 902, and the sealing gasket is located inside the limiting groove 902.

[0040] The sealing gasket enhances the sealing between the limiting strip 901 and the limiting groove 902, improving the stability of the snap-fit ​​installation.

[0041] like Figure 1 As shown, in a preferred embodiment, based on the above method, the spiral strips 13 are further distributed equidistantly along the stirring shaft 7, with an adjacent spacing of 100 mm and a spacing error of ±0.5 mm.

[0042] The equidistantly distributed spiral strips 13 improve the uniformity and stability of the material flow field.

[0043] like Figure 1 As shown, in a preferred embodiment, based on the above method, the stirring shaft 7 and the stirring blade 8 are further configured as a stainless steel alloy shaft and a stainless steel alloy blade, respectively.

[0044] The stainless steel alloy stirring shaft 7 and stirring blades 8 combine high strength and corrosion resistance, ensuring stirring stability and durability.

[0045] Example 3

[0046] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0047] After removing the bolts 12 between the mounting ring 10 and the fixing ring 11, the inflatable membrane 3 is taken out upwards from between the outer groove 1 and the inner groove 2. The inflatable membrane 3 drives the limiting strip 901 to move upwards along the inside of the limiting groove 902. During installation, the inflatable membrane 3 is placed between the outer groove 1 and the inner groove 2. At the same time, the limiting strips 901 on the inner and outer sides of the inflatable membrane 3 are aligned with the limiting grooves 902 on the outer groove 1 and the inner groove 2, and are engaged into the limiting grooves 902 by the limiting strips 901, thus completing the installation of the inflatable membrane 3 between the outer groove 1 and the inner groove 2. When the stirring shaft 7 and the stirring blade 8 rotate and stir in the inner groove 2, the dynamic interaction between the stirring blade 8 and the material generates mechanical vibration, forming a periodic load and transmitting it to the inner groove 2. The inflatable membrane 3 between the inner groove 2 and the outer groove 1 utilizes the compressible gas... The gas is compressed or expanded during vibration and impact, converting the mechanical energy of the vibration into the internal energy of the gas, thus dissipating energy and weakening the transmission of vibration. The air exchange block 4 and air exchange hole 5 between adjacent air-filled membranes 3 form a gas communication channel. When the air-filled membrane in a certain area is impacted and the pressure changes suddenly, the gas will flow to the air-filled membranes 3 in other areas through the air exchange block 4 and air exchange hole 5, balancing the pressure distribution, dynamically adjusting the buffer stiffness of each part, further suppressing the vibration response of the inner tank 2, and finally achieving effective elimination and weakening of vibration, ensuring the stable operation of the mixing tank. The spiral strip 13, with its special geometric structure, guided the material to make axial and circumferential compound motion along the spiral path under the drive of the stirring shaft 7 and stirring blade 8, reducing mechanical vibration caused by uneven flow field.

[0048] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A highly stable acidification stirring tank, comprising an outer tank (1), characterized in that: An inner groove (2) is provided inside the outer groove (1). An inflatable membrane (3) is uniformly arranged between the outer groove (1) and the inner groove (2). An inflatable membrane (3) arranged in a ring array is provided between the outer groove (1) and the inner groove (2). An air exchange block (4) is provided between each inflatable membrane (3). The inflatable membranes (3) are connected circumferentially and evenly through the air exchange blocks (4) to form a closed ring buffer structure around the outer side of the inner groove (2). Air exchange holes (5) are uniformly opened on the air exchange blocks (4). Adjacent inflatable membranes (3) are connected through the air exchange holes (5). The inflatable membranes (3) are connected to the outer groove. A limiting component (9) is provided between (1) and the inner tank (2). An air inlet (14) is provided at the bottom of the air-filled membrane (3). A motor (6) is installed at the top of the inner tank (2). A stirring shaft (7) is fixed to the output shaft of the motor (6). Stirring blades (8) are evenly provided at the bottom end of the stirring shaft (7). A fixing ring (11) is sleeved on the outer side of the top of the outer tank (1). An installation ring (10) is sleeved on the outer side of the top of the inner tank (2) and above the fixing ring (11). Bolts (12) are evenly installed between the installation ring (10) and the fixing ring (11).

2. The highly stable acidification stirring tank according to claim 1, characterized in that: The limiting component (9) includes a limiting strip (901) and a limiting groove (902). The limiting strip (901) is evenly disposed on the inner and outer sides of the inflatable membrane (3). The limiting groove (902) is evenly disposed on the inner side of the outer groove (1) and the outer side of the inner groove (2). The shape of the limiting groove (902) matches that of the limiting strip (901).

3. The highly stable acidification stirring tank according to claim 1, characterized in that: The inner side of the inner groove (2) is provided with a spiral strip (13), and the outer side of the spiral strip (13) is set as an arc surface.

4. The highly stable acidification stirring tank according to claim 1, characterized in that: The inflatable membrane (3) is made of fluororubber, and anti-slip textures are uniformly provided on the outer side of the inflatable membrane (3).

5. The highly stable acidification stirring tank according to claim 1, characterized in that: A sealing gasket is provided at the engagement point between the limiting strip (901) and the limiting groove (902), and the sealing gasket is located inside the limiting groove (902).

6. The highly stable acidification stirring tank according to claim 1, characterized in that: The spiral strips (13) are equidistantly distributed along the axial direction of the stirring shaft (7), with a spacing error of ±0.5mm.

7. The highly stable acidification stirring tank according to claim 1, characterized in that: The stirring shaft (7) and stirring blade (8) are respectively set as stainless steel alloy shaft and stainless steel alloy blade.

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