A stirred tank for antifoam preparation

Abstract

The utility model discloses a kind of stirring tanks for defoaming agent preparation, including kettle body, baffle is arranged at equal intervals in kettle body inner wall, for destroying liquid circulation, weakening liquid surface depression;Motor is installed at kettle body top, motor drives stirring shaft rotation, stirring shaft bottom connects stirring vane, stirring vane is reliably fixed by connecting seat, blade, threaded column, positioning column and nut assembly, and sealing property is guaranteed by sealing ring, sealing groove and sealing ring, to avoid leakage. Stirring shaft is equipped with baffle disc, the outer diameter of baffle disc is greater than stirring vane diameter, disc face is micro taper face or camber structure, its surface is provided with through slot, for cutting off vortex channel above blade and realizing liquid up and down exchange. Baffle disc top is equipped with connecting ring and screw hole, it is convenient to be fastened with stirring shaft connection. When stirring vane is assembled, baffle disc and blade tip keep reasonable gap.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a stirring tank for the preparation of defoamers. Background Technology

[0002] In existing defoamer preparation processes, stirred tanks with stirring blades are commonly used to mix and disperse materials. However, when dealing with systems with high viscosity and easy foaming properties, traditional stirred tanks tend to generate significant eddies during the high-speed rotation of the stirring blades. This causes the liquid surface to sink and a large amount of air to be entrained, resulting in secondary foaming during the stirring process. This not only reduces the preparation efficiency of the defoamer but also affects the stability and quality of the product.

[0003] To mitigate surface eddies, some stirred tanks incorporate baffles on their inner walls to break up circumferential vortices and improve fluid circulation. However, relying solely on baffles is insufficient to completely suppress the coupling between the low-pressure zone above the blades and the liquid surface; surface eddies remain noticeable, and the air entrapment problem persists. Furthermore, the connection between the impeller and shaft in existing stirred tanks largely relies on a single bolt fixation method, which is prone to loosening and leakage under high-frequency vibration and prolonged operation, leading to frequent maintenance and insufficient sealing reliability.

[0004] Furthermore, in existing stirred tanks, if an anti-vortex structure is installed above the stirring blades, it is mostly a closed disc. While this type of structure blocks the upward movement of the vortex core to some extent, the lack of a liquid channel increases the pressure difference between the upper and lower liquids, easily forming secondary vortices, which in turn affects the stirring effect and circulation uniformity. At the same time, if the fit clearance between the anti-vortex structure and the stirring blades is not properly controlled, it may also lead to poor liquid entrainment and the problem of gas entrainment still exists.

[0005] Therefore, existing defoamer preparation stirred tanks generally have the following technical problems: 1. Severe liquid surface depression allows air to be easily trapped, leading to secondary foaming, which reduces preparation efficiency and product stability; 2. Anti-vortex structures are mostly closed designs, which obstruct the exchange of liquid between the upper and lower parts, making it easy to form new secondary vortices and resulting in uneven circulation; 3. The connection and sealing structure between the stirring blades and the stirring shaft are not reasonable, which can easily lead to loosening, leakage and other problems, resulting in insufficient reliability. Utility Model Content

[0006] In view of the problems existing in the prior art, the purpose of this utility model is to provide a stirring tank for the preparation of defoamers, which can effectively suppress liquid surface eddies and air entrapment, while ensuring smooth liquid circulation and improving the reliability of connection sealing.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A stirring vessel for preparing defoamer includes a vessel body, the inner wall of which is provided with baffles. The baffles are distributed at equal intervals around the central axis of the vessel body. The baffles are used to suppress overall vortices and circumferential flow, and to reduce liquid surface depressions and air entrapment. A motor is installed at the top of the vessel, and a stirring shaft is connected to the output end of the motor. A stirring blade is connected to the bottom of the stirring shaft, and the stirring blade is used to stir the mixture in the vessel. A turbulence-disrupting disk is fitted onto the stirring shaft. The turbulence-disrupting disk is used to cut off the pressure gradient channel above the stirring blades and block the coupling of the vortex core to the liquid surface.

[0008] Furthermore, the outer diameter Ds of the turbulence disk is 1.1 to 1.3 times the diameter D of the stirring blade, and the thickness t of the turbulence disk is 6 to 12 mm.

[0009] Furthermore, the upper surface of the turbulence disk is a micro-conical surface with an outward 2° to 3° angle or has an arch of 1 / 200 to 1 / 100 to improve rigidity and facilitate drainage.

[0010] Furthermore, the spoiler disk has through slots that are evenly distributed around the central axis of the spoiler disk.

[0011] Furthermore, the stirring blade includes a connecting seat sleeved at the bottom of the stirring shaft, and blades are evenly spaced around the outer side of the connecting seat around its central axis; The bottom of the connector has a through-hole and a positioning hole, with the positioning holes evenly distributed around the connecting hole; The bottom of the stirring shaft is provided with a threaded post and a positioning post, with the positioning post corresponding to the positioning hole; The threaded post passes through the connecting hole, and a nut is connected to the threaded post.

[0012] Furthermore, a sealing cap is provided at one end of the nut, and a sealing ring is provided on the outer side of the other end of the nut.

[0013] Furthermore, a sealing groove is provided on the contact surface between the sealing ring and the connecting seat, and a sealing ring is provided in the sealing groove.

[0014] Furthermore, a connecting ring is provided at the top center of the turbulence plate, and the stirring shaft passes through the connecting ring.

[0015] Furthermore, the outer surface of the connecting ring is provided with threaded holes, which are evenly distributed around the axis of the connecting ring.

[0016] Furthermore, when the stirring blades are assembled, the axial clearance δ between the lower surface of the turbulence disk and the blade tip is 5–15 mm.

[0017] Compared with the prior art, the beneficial effects of this utility model are: In this technical solution, by arranging baffles at equal intervals on the inner wall of the vessel, the large circumferential circulation formed by the liquid on the inner wall of the vessel can be effectively broken, the degree of liquid surface depression can be reduced, and the air entrainment during the mixing process can be reduced. This improves the problem of obvious liquid surface vortex and easy air entrainment leading to secondary foaming in existing stirred vessels, and improves the preparation efficiency of defoamer and the stability of the product.

[0018] In this technical solution, by installing a turbulence-inducing disk on the stirring shaft and opening a through groove on the surface of the turbulence-inducing disk, the pressure gradient channel above the stirring blades can be cut off, and the coupling relationship between the vortex core and the liquid surface can be blocked. At the same time, the through groove provides a channel for the liquid above and below the disk, allowing the fluid above and below to exchange, avoiding the accumulation of pressure difference and secondary vortices caused by the closed disk surface, thereby ensuring the uniformity of the flow field and improving the problems of existing anti-vortex structures that hinder liquid circulation and have poor stirring effect.

[0019] In this technical solution, by setting a connecting hole, a positioning hole, a threaded post, and a positioning post at the connection between the stirring blade and the stirring shaft, and by using a combination structure of nut, sealing ring, sealing groove, and sealing ring to achieve fastening and sealing, it is possible to ensure that the stirring blade still has good coaxiality and stability under high-speed operation, while improving the sealing reliability and avoiding loosening and leakage. This solves the technical problems of the existing stirring blade and stirring shaft connection being not firm and the sealing performance being insufficient.

[0020] In this technical solution, by rationally designing the axial gap between the baffle plate and the blade tip, the baffle plate and the baffle plate work together on the liquid. This not only avoids the stirring blades directly entraining the liquid and impacting the liquid surface, but also further weakens the liquid surface eddies and air entrainment, thereby significantly improving the mixing uniformity and stability of the defoamer during the preparation process and solving the problem of unsatisfactory defoaming effect in traditional stirred tanks. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the stirring mechanism of this utility model; Figure 3 This is a schematic diagram of the structure of the stirring shaft of this utility model; Figure 4 This is a schematic diagram of the structure of the stirring blade of this utility model. Figure 1 ; Figure 5 This is a schematic diagram of the structure of the stirring blade of this utility model. Figure 2 ; Figure 6 This is a schematic diagram of the structure of the nut of this utility model; Figure 7This is a schematic diagram of the structure of the spoiler disc of this utility model. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the spoiler disc of this utility model. Figure 2 .

[0022] The attached diagram lists the components represented by each number as follows: 1. Kettle body; 11. Baffle plate; 2. Electric motor; 3. Stirring shaft; 31. Threaded column; 32. Positioning column; 4. Agitator blade; 41. Connecting seat; 411. Connecting hole; 412. Positioning hole; 42. Blade; 43. Nut; 431. Sealing cap; 432. Sealing ring; 4321. Sealing groove; 5. Spoiler plate; 51. Through groove; 52. Connecting ring; 521. Threaded hole. Detailed Implementation

[0023] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0024] Example 1: See Figure 1-8 A stirred tank for preparing defoamer includes a tank body 1; the inner wall of the tank body 1 is provided with baffles 11, which are evenly distributed around the central axis of the tank body 1. The baffles 11 are fixed by welding to the inner wall of the tank body 1, and can break the overall vortex flow field of the liquid when the stirring blades 4 rotate at high speed, and suppress the large circumferential circulation of the liquid; the presence of baffles 11 can effectively reduce the depression formed on the liquid surface due to negative pressure, reduce the situation of air entrainment into the liquid, thereby reducing the phenomenon of secondary foaming and ensuring the stability and uniformity of the defoamer in the preparation process; See Figure 1-2 A motor 2 is installed at the top of the vessel body 1. The motor 2 is connected to the stirring shaft 3 via a coupling. The output end of the motor 2 can drive the stirring shaft 3 to rotate stably. The stirring shaft 3 passes through the upper end of the vessel body 1 and is arranged vertically on the central axis of the vessel body 1. The bottom of the stirring shaft 3 is reliably fixed to the connecting seat 41 via a threaded column 31. The stirring shaft 3 drives the stirring blade 4 to rotate. The blades 42 of the stirring blade 4 generate forced circulation of the mixture in the vessel body 1, so that the material can be fully mixed and dispersed. In order to reduce the direct impact of the blades 42 on the liquid surface when rotating, a baffle plate 5 is fitted on the stirring shaft 3. The baffle plate 5 is located above the stirring blade 4 and can cut off the pressure gradient channel above the stirring blade 4, block the coupling between the vortex core and the liquid surface, thereby reducing the degree of liquid surface depression. See Figure 1-2The outer diameter Ds of the turbulence disk 5 is 1.1 to 1.3 times the diameter D of the stirring blade 4. The setting of the outer diameter Ds can cover the rotation area formed by the blade 42 and ensure the effect of suppressing eddies. The thickness t of the turbulence disk 5 is 6 to 12 mm. The thicker structure can maintain sufficient rigidity and stability under high speed conditions and avoid deformation due to vibration. See Figure 7-8 The upper surface of the turbulence plate 5 is a micro-cone surface with an outward 2° to 3° angle or an arch of 1 / 200 to 1 / 100. The presence of the micro-cone surface or arch can enhance the overall structural strength of the turbulence plate 5, while making it easier for liquid to be discharged during cleaning and operation, avoiding the accumulation of residual liquid on the plate surface, thereby improving the service life and hygienic performance of the anti-vortex plate in the defoamer preparation process. See Figure 7-8 A through groove 51 is provided on the turbulence plate 5. The through groove 51 is evenly distributed around the central axis of the turbulence plate 5. The through groove 51 is a long strip structure, which can provide a controllable channel for the liquid between the upper and lower parts of the plate. The liquid exchanges between the upper and lower parts through the through groove 51, which can effectively reduce the pressure difference formed between the upper and lower parts of the plate, avoid secondary eddies caused by the completely closed structure, and thus ensure a more uniform stirring flow field and further reduce the phenomenon of air entrainment. See Figure 2-6 The stirring blade 4 includes a connecting seat 41 sleeved on the bottom of the stirring shaft 3; blades 42 are evenly spaced around the central axis of the connecting seat 41, and the blades 42 are upward-pushing hydraulic foil structures that can form an axial flow from bottom to top when rotating; a connecting hole 411 and a positioning hole 412 are opened through the bottom of the connecting seat 41, and the positioning holes 412 are evenly distributed around the connecting hole 411; a threaded post 31 and a positioning post 32 are provided at the bottom of the stirring shaft 3, and the positioning post 32 cooperates with the positioning hole 412 to achieve precise positioning of the stirring blade 4; the threaded post 31 passes through the connecting hole 411, and a nut 43 is connected to the threaded post 31, which reliably fixes the connecting seat 41 to the stirring shaft 3; See Figure 2-6 One end of the nut 43 is provided with a sealing cap 431, which can cover the threaded end to reduce liquid intrusion; the other end of the nut 43 is provided with a sealing ring 432, which improves the sealing performance of the connection through the tightening action, ensuring that no leakage occurs during the stirring process. See Figure 2-6 A sealing groove 4321 is provided on the contact surface between the sealing ring 432 and the connecting seat 41. A sealing ring is provided in the sealing groove 4321. The sealing ring can effectively fill the gap when it is compressed, improve the sealing reliability, and avoid equipment failure and cleaning difficulties caused by material leakage. See Figure 7-8A connecting ring 52 is provided at the top center of the turbulence plate 5. The connecting ring 52 and the stirring shaft 3 are sleeved together. The stirring shaft 3 passes through the connecting ring 52 and is fixed on the turbulence plate 5, ensuring that the turbulence plate 5 can rotate synchronously with the stirring shaft 3. See Figure 7-8 A threaded hole 521 is provided through the outer side of the connecting ring 52. The threaded holes 521 are evenly distributed around the axis of the connecting ring 52. Fastening screws can be installed in the threaded holes 521 to enhance the connection strength between the turbulence plate 5 and the stirring shaft 3 and prevent loosening under high speed conditions. See Figure 1-2 When the stirring blade 4 is assembled, the axial gap δ between the lower surface of the baffle plate 5 and the tip of the blade 42 is 5-15mm. The reasonable gap δ can prevent the stirring blade 4 from directly entraining liquid and impacting the liquid surface. At the same time, it works together with the baffle plate 5 to effectively reduce liquid surface depression, reduce air entrainment, and improve the stability of the defoamer preparation process.

[0025] Example 2: See Figure 1-8 A stirring vessel for preparing defoamer includes a vessel body 1; baffles 11 are evenly spaced on the inner wall of the vessel body 1, and the baffles 11 are vertically fixed on the inner wall of the vessel body 1. During stirring, the baffles 11 can disrupt the circumferential vortex flow formed by the liquid near the inner wall of the vessel body 1, interrupt the large-scale circulation path, make the liquid flow state more uniform, thereby reducing the degree of liquid surface depression and reducing the possibility of air entrainment.

[0026] See Figure 1-2 A motor 2 is installed on the top of the vessel body 1. The output end of the motor 2 is coaxially connected to the stirring shaft 3 through a coupling. When the motor 2 is powered on, it can drive the stirring shaft 3 to rotate stably. The stirring shaft 3 runs from top to bottom through the top of the vessel body 1 and extends into the internal space of the vessel body 1. The bottom end of the stirring shaft 3 is connected to the stirring blade 4. The stirring blade 4 is sleeved on the bottom end of the stirring shaft 3 through a connecting seat 41. Blades 42 are evenly distributed on the outer periphery of the connecting seat 41. The blades 42 are upward-pushing hydraulic foil paddle structures. When rotating, they can generate an axial flow from bottom to top, which drives the mixture in the vessel body 1 to circulate and tumble, so that the materials are fully mixed. See Figure 2-6The bottom of the connecting seat 41 is provided with a connecting hole 411 and multiple positioning holes 412. The connecting hole 411 is engaged with the threaded post 31 at the bottom of the stirring shaft 3, and the positioning holes 412 are corresponding to the positioning posts 32 at the bottom of the stirring shaft 3. The positioning posts 32 are inserted into the positioning holes 412 to ensure that the connecting seat 41 and the stirring shaft 3 are radially aligned and to prevent eccentric operation. The threaded post 31 passes through the connecting hole 411 and is fastened by the nut 43. One end of the nut 43 is equipped with a sealing cap 431 and the other end is equipped with a sealing ring 432. A sealing groove 4321 is provided on the contact surface of the sealing ring 432. A sealing ring is installed in the sealing groove 4321. The sealing ring can be compressed and filled when the nut 43 is tightened to achieve liquid sealing and gas sealing, and prevent material leakage and air infiltration.

[0027] See Figure 1-2 and Figure 7-8 A baffle plate 5 is fitted onto the stirring shaft 3. The baffle plate 5 is fixed in the middle section of the stirring shaft 3. Its outer diameter Ds is 1.1 to 1.3 times the diameter D of the stirring blade 4, and its thickness t is 6 to 12 mm, which can ensure sufficient structural strength during operation. The upper surface of the baffle plate 5 is designed as a micro-conical surface with an outward 2° to 3° or an arch structure with a 1 / 200 to 1 / 100 camber, which facilitates liquid discharge during rotation and prevents liquid accumulation on the plate surface. A connecting ring 52 is provided inside the baffle plate 5. The stirring shaft 3 passes through the connecting ring 52. Multiple threaded holes 521 are opened on the outer side of the connecting ring 52. The threaded holes 521 are used to install fastening screws, so that the baffle plate 5 is reliably connected to the stirring shaft 3 and prevents loosening at high speed. See Figure 7-8 Multiple through grooves 51 are evenly distributed on the turbulence plate 5. The through grooves 51 penetrate through the thickness direction of the turbulence plate 5, forming a liquid channel that runs vertically through the plate. The liquid can exchange flow between the upper and lower surfaces of the plate through the through grooves 51, reducing the pressure difference between the upper and lower surfaces of the turbulence plate 5, avoiding the formation of secondary eddies, and thus ensuring a more uniform stirring and circulating flow field. See Figure 1-2 During the assembly process, an axial gap δ of 5-15 mm is maintained between the lower surface of the turbulence disk 5 and the tip of the blade 42 of the stirring blade 4. The reasonable gap δ can prevent the blade 42 from directly entraining liquid and impacting the liquid surface. The turbulence disk 5 plays a role in cutting off and dispersing the liquid vortex core. Combined with the flow suppression effect of the turbulence plate 11, the three can significantly reduce the liquid surface depression, reduce air entrainment, and improve the preparation effect of the defoamer.

[0028] During operation in this embodiment, after the motor 2 starts, it drives the stirring shaft 3 to rotate. The stirring shaft 3 drives the connecting seat 41 and the blades 42 to rotate. The blades 42 push the liquid to flow from bottom to top, forming a forced circulation flow field. During the rotation, the turbulence plate 5 cuts off the low-pressure area above the blades 42 to prevent the vortex core from extending to the liquid surface. The through groove 51 ensures the exchange of liquid between the upper and lower parts. The turbulence plate 11 breaks the circulation formed on the inner wall of the vessel 1, thereby making the liquid flow field in the entire vessel 1 uniform and stable, and ultimately achieving the purpose of improving mixing efficiency, reducing air entrainment and avoiding secondary foaming.

[0029] The working principle of this utility model is as follows: When motor 2 starts, its output drives the stirring shaft 3 to rotate, and the stirring blades 4 connected to the lower end of the stirring shaft 3 rotate accordingly. The stirring blades 42 generate an upward circulating flow field on the mixture in the vessel 1, forming an axial flow from bottom to top inside the liquid, thereby accelerating the mixing and uniform dispersion of the materials.

[0030] During the stirring process, the turbulence disk 5, fitted onto the stirring shaft 3, is positioned above the stirring blades 4. The turbulence disk 5 can cut off the pressure gradient channel above the stirring blades 4, blocking the coupling of the vortex core to the liquid surface, thus reducing the vortex pit on the liquid surface and lowering the risk of air entrainment. The outer diameter Ds of the turbulence disk 5 is larger than the diameter D of the stirring blades 4, ensuring the coverage of the anti-vortex effect; at the same time, the micro-conical or arched structure on the upper surface of the turbulence disk 5 enhances the rigidity of the disk body and facilitates liquid discharge during cleaning and operation.

[0031] The through slots 51 on the turbulence plate 5 are evenly distributed on the circumference. The through slots 51 provide a controllable flow channel for the liquid, thereby reducing the pressure difference between the top and bottom of the plate, ensuring the exchange and circulation of the liquid, and preventing the secondary eddy phenomenon caused by the complete blockage of the plate surface.

[0032] When the stirring blade 4 is assembled with the stirring shaft 3, the connecting seat 41 is connected to the threaded post 31 through the connecting hole 411 and fixed by the nut 43; the positioning post 32 and the positioning hole 412 cooperate with each other to achieve precise axial and radial positioning of the stirring blade 4. One end of the nut 43 is provided with a sealing cap 431, and the other end is provided with a sealing ring 432. The contact surface of the sealing ring 432 is provided with a sealing groove 4321 and a sealing ring is installed, thereby ensuring the sealing of the connection and preventing material leakage.

[0033] Under normal operating conditions, the baffles 11 are evenly distributed along the inner wall of the vessel 1, which can suppress the overall vortex and circumferential flow of the liquid in the vessel 1, further weaken the liquid surface depression, and enhance the vertical circulation effect of the liquid. When the stirring blade 4 rotates, an axial gap δ of 5-15 mm is maintained between the lower surface of the baffle plate 5 and the tip of the blade 42. This gap can effectively prevent the blade from carrying liquid directly to the liquid surface. Combined with the joint action of the baffle plate 5 and the baffle 11, the gas entrainment is significantly reduced, ensuring the stability and uniformity of the defoamer during the preparation process.

[0034] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A stirred tank for preparing defoamer, comprising a tank body (1), characterized in that: The inner wall of the vessel body (1) is provided with a baffle plate (11). The baffle plate (11) is distributed at equal intervals around the central axis of the vessel body (1). The baffle plate (11) is used to suppress the overall vortex and circumferential flow, and to weaken the liquid surface depression and air entrapment. A motor (2) is provided on the top of the vessel body (1), and a stirring shaft (3) is connected to the output end of the motor (2). A stirring blade (4) is connected to the bottom of the stirring shaft (3). The stirring blade (4) is used to stir the mixture in the vessel body (1). The stirring shaft (3) is fitted with a turbulence disk (5), which is used to cut off the pressure gradient channel above the stirring blade (4) and block the coupling of the vortex core to the liquid surface.

2. The stirred tank for preparing defoamer according to claim 1, characterized in that: The outer diameter Ds of the turbulence disk (5) is 1.1 to 1.3 times the diameter D of the stirring blade (4), and the thickness t of the turbulence disk (5) is 6 to 12 mm.

3. The stirred tank for preparing defoamer according to claim 1, characterized in that: The upper surface of the turbulence plate (5) is a micro-conical surface with an outward 2° to 3° angle or an arch of 1 / 200 to 1 / 100, in order to improve rigidity and facilitate drainage.

4. The stirred tank for preparing defoamer according to claim 3, characterized in that: The spoiler disk (5) has through slots (51) that are evenly distributed around the central axis of the spoiler disk (5).

5. The stirred tank for preparing defoamer according to claim 1, characterized in that: The stirring blade (4) includes a connecting seat (41) sleeved on the bottom of the stirring shaft (3), and blades (42) are arranged at equal intervals around the central axis on the outer side of the connecting seat (41). The bottom of the connector (41) is provided with a connecting hole (411) and a positioning hole (412), and the positioning holes (412) are distributed at equal intervals around the connecting hole (411); The bottom of the stirring shaft (3) is provided with a threaded post (31) and a positioning post (32), and the positioning post (32) corresponds to the positioning hole (412); The threaded post (31) passes through the connecting hole (411), and a nut (43) is connected to the threaded post (31).

6. The stirred tank for preparing defoamer according to claim 5, characterized in that: One end of the nut (43) is provided with a sealing cap (431), and the other end of the nut (43) is provided with a sealing ring (432).

7. A stirred tank for preparing defoamer according to claim 6, characterized in that: A sealing groove (4321) is provided on the contact surface between the sealing ring (432) and the connecting seat (41), and a sealing ring is provided in the sealing groove (4321).

8. The stirred tank for preparing defoamer according to claim 1, characterized in that: A connecting ring (52) is provided at the top center of the turbulence plate (5), and the stirring shaft (3) is provided through the connecting ring (52).

9. A stirred tank for preparing defoamer according to claim 8, characterized in that: The outer side of the connecting ring (52) is provided with threaded holes (521), and the threaded holes (521) are evenly distributed around the axis of the connecting ring (52).

10. A stirred tank for preparing defoamer according to claim 5, characterized in that: When the stirring blade (4) is assembled, the axial gap δ between the lower surface of the turbulence disk (5) and the tip of the blade (42) is 5 to 15 mm.

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