Fluorine-containing chemical mixing and stirring tank

Abstract

The utility model relates to the technical field of stirring tanks, provides a fluorine-containing chemical mixing and stirring tank, and solves the problem that an existing stirring tank cannot be self-adaptive to liquid level and viscosity changes due to design defects. The device comprises a tank body, wherein a feeding valve is arranged at the top of the tank body; the stirring rod is arranged in the tank body; the motor is arranged at the top of the tank body and is in driving connection with the stirring rod; the liquid level monitoring modules are respectively arranged at different heights of the inner wall of the tank body; the rotating speed sensor is arranged on the stirring rod and used for detecting the actual rotating speed of the stirring rod; the controller is electrically connected with the motor, the liquid level monitoring modules and the rotating speed sensor; through the positive correlation control of the liquid level height and the motor output power, the stirring strength is improved at a high liquid level, the energy consumption is reduced at a low liquid level, and the balance of the mixing efficiency and the energy consumption is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of agitator tank, concretely relates to a fluorine-containing chemical mixing agitator tank. BACKGROUND

[0002] In the production process of fluorine-containing chemicals (such as fluorine-containing pharmaceutical intermediates, fluorinated electrolyte, etc.), raw material mixing is a key link to determine product quality. The existing mixing device mostly adopts fixed speed stirring structure, such as the raw material mixing device for fluorine-containing pharmaceutical intermediates disclosed in Chinese patent publication No. CN218688522U, which realizes inner wall residue removal through the combination of stirring rod and scraper. However, at high liquid level, insufficient stirring power will cause bottom sedimentation (such as fluorinated salt crystallization), and at low liquid level, fixed high-power operation is easy to cause splashing and energy waste. In addition, the viscosity of fluorine-containing raw materials changes with the reaction process (such as polymerization reaction), and the existing device lacks real-time response capability to viscosity changes, which is easy to cause sudden increase of stirring resistance, motor overload and even equipment damage. SUMMARY

[0003] Therefore, in view of the above problems, the utility model provides a fluorine-containing chemical mixing agitator tank to solve the problem that the existing agitator tank cannot adapt to liquid level and viscosity changes due to design defects.

[0004] To achieve the above purpose, the utility model is realized by the following technical scheme:

[0005] A fluorine-containing chemical mixing agitator tank, comprising:

[0006] A tank body, provided with a feed valve at the top;

[0007] A stirring rod arranged in the tank body;

[0008] A motor arranged at the top of the tank body and drivingly connected with the stirring rod;

[0009] A plurality of liquid level monitoring modules arranged at different heights of the inner wall of the tank body;

[0010] A speed sensor arranged on the stirring rod for detecting the actual speed of the stirring rod;

[0011] A controller electrically connected with the motor, each liquid level monitoring module and speed sensor, and configured to adjust the output power of the motor to change the speed of the stirring rod according to the liquid level height fed back by each liquid level monitoring module, the liquid level height being positively correlated with the output power, and at the same output power, setting a standard speed range of the stirring rod, if the actual speed is lower than the lower limit of the standard speed range, then opening the feed valve to supplement dilution raw materials into the tank body.

[0012] Further, the number of the liquid level monitoring modules is three, which are respectively arranged on the upper, middle and lower sidewalls of the tank body.

[0013] Further, the feeding valve is connected to the dilution raw material storage tank through the feeding pipe.

[0014] Further, the stirring rod comprises a main shaft and a plurality of cross-shaped stirring blades, and each cross-shaped stirring blade is arranged on the outside of the main shaft in a sleeved manner.

[0015] Further, the lowermost cross-shaped stirring blade is 5-10 cm away from the bottom of the tank body.

[0016] Further, the outside of each cross-shaped stirring blade is covered with a fluororubber wear-resistant layer, and the surface of the cross-shaped stirring blade is provided with flow guide holes, the hole diameter of the flow guide holes gradually increases from inside to outside along the radial direction of the blade.

[0017] Further, the controller is further configured to dynamically adjust the replenishment amount of the dilution raw material according to the liquid level height fed back by the liquid level monitoring module.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] 1. The utility model discloses a positive correlation control of liquid level height and motor output power, ensures that the stirring intensity is improved when the liquid level is high (prevents deposition), reduces energy consumption when the liquid level is low (reduces splashing), and realizes the balance of mixing efficiency and energy consumption.

[0020] 2. The utility model discloses the comparison of the rotational speed sensor and the standard rotational speed range, automatically triggers the dilution raw material replenishment, avoids the problem that the stirring resistance is too large, the equipment is stuck or the mixing is uneven due to the too high viscosity.

[0021] 3. The utility model discloses the controller integrates liquid level and rotational speed double feedback signals, realizes the automatic production without manual intervention, and is suitable for continuous fluorine-containing chemical manufacturing scenes. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 It is a tank body section structure schematic view of the utility model embodiment;

[0023] Fig. 2 It is a tank body and dilution raw material storage tank connection structure schematic view of the utility model embodiment.

[0024] REFERENCE SIGNS

[0025] Tank body 1;Feeding valve 11;

[0026] Stirring rod 2;Main shaft 21;Cross-shaped stirring blade 22;Flow guide hole 23;

[0027] Motor 3;

[0028] Liquid level monitoring module 4;

[0029] Speed ​​sensor 5;

[0030] Controller 6;

[0031] Feed pipe 7;

[0032] 8. Diluted raw material storage tank. Detailed Implementation

[0033] The following will describe the implementation of this utility model in detail with reference to specific embodiments, so that the process of how this utility model uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0034] Example

[0035] like Figs. 1-2 As shown, a mixing tank for fluorinated chemicals includes:

[0036] Tank 1, the top of which is provided with a feed valve 11;

[0037] A stirring rod 2 is disposed inside the tank 1;

[0038] Motor 3 is located at the top of tank 1 and is connected to the stirring rod 2 for driving;

[0039] Several liquid level monitoring modules 4 are respectively installed at different heights on the inner wall of the tank 1;

[0040] The speed sensor 5 is installed on the stirring rod 2 to detect the actual speed of the stirring rod 2;

[0041] The controller 6 is electrically connected to the motor 3, each of the liquid level monitoring modules 4 and the speed sensor 5, and is configured to: adjust the output power of the motor 3 to change the speed of the stirring rod 2 according to the liquid level height fed back by each of the liquid level monitoring modules 4. The liquid level height is positively correlated with the output power. Under the same output power, a standard speed range of the stirring rod 2 is set. If the actual speed is lower than the lower limit of the standard speed range, the feed valve 11 is controlled to open to replenish the diluent raw material into the tank 1.

[0042] The motor 3 is a servo motor or a rotary motor, each of the liquid level monitoring modules 4 is a capacitive sensor, and the controller 6 is a PCL controller. All components, including the speed sensor 5, can be purchased from the market and will not be described in detail here.

[0043] By controlling the positive correlation between liquid level and motor 3 output power, the stirring intensity is increased at high liquid levels (to prevent sedimentation), and energy consumption is reduced at low liquid levels (to reduce splashing), thus achieving a balance between mixing efficiency and energy consumption. Based on the comparison between the speed sensor 5 and the standard speed range, the dilution material replenishment is automatically triggered to avoid problems such as excessive stirring resistance, equipment jamming, or uneven mixing caused by excessive viscosity. By integrating the liquid level and speed dual feedback signals through the controller 6, automated production without manual intervention is achieved, which is suitable for continuous fluorinated chemical manufacturing scenarios.

[0044] The liquid level monitoring module 4 consists of three modules, which are respectively located on the upper, middle and lower side walls of the tank 1; multi-point data input improves the accuracy of the controller in adjusting the power of the motor 3 and optimizes the mixing effect.

[0045] It also includes a feed pipe 7 and a diluent storage tank 8. The feed valve 11 is connected to the diluent storage tank 8 through the feed pipe 7. The integrated design of the feed pipe 7 and the diluent storage tank 8 enables a rapid response and ensures that the dilution process is timely and efficient. In other preferred embodiments, multiple diluent storage tanks 8 can be connected to support flexible switching of different diluents (such as water and solvents).

[0046] The stirring rod 2 includes a main shaft 21 and a plurality of cross-shaped stirring blades 22. Each cross-shaped stirring blade 22 is spaced out on the outside of the main shaft 21. The cross-shaped stirring blades 22 are spaced out to form axial and radial flow, which enhances shear force and convection mixing effect. The blades are spaced out on the outside of the main shaft 21 to avoid stress concentration problems caused by welding or bolt connection.

[0047] The bottommost cross-shaped stirring blades 22 are 5-10cm away from the bottom of the tank 1; this eliminates bottom sedimentation, ensures that the raw materials are fully involved in the mixing, and the close-range bottom stirring prevents high-density fluorinated chemicals (such as fluoride salts) from depositing and solidifying, reduces repeated stirring caused by bottom residue, and shortens the mixing cycle.

[0048] Each of the cross-shaped stirring blades 22 is covered with a fluororubber wear-resistant layer, and the surface of the cross-shaped stirring blade 22 is provided with a flow guide hole 23. The diameter of the flow guide hole 23 gradually increases from the inside to the outside along the radial direction of the blade. The fluororubber coating layer resists corrosion from fluorinated chemicals and extends the blade life. The flow guide hole 23 gradually increases in diameter from the inside to the outside, forming a gradient shear force, which enhances the turbulent mixing effect of high viscosity liquids. The flow guide hole 23 can release local pressure and reduce stirring power loss.

[0049] The inner wall of the tank 1 is coated with a polytetrafluoroethylene (PTFE) anti-corrosion layer. The PTFE coating is resistant to strong corrosive media such as hydrofluoric acid, which can extend the service life of the tank 1.

[0050] The controller 6 is also configured to dynamically adjust the replenishment amount of diluent based on the liquid level height fed back by the liquid level monitoring module 4. The higher the liquid level, the larger the single replenishment amount, and the replenishment amount is calculated using the following formula:

[0051] Q = k·(H / H) max )·(N1-N2)

[0052] Where Q is the replenishment amount, k is the compensation coefficient, and H is the current liquid level height. max N1 represents the maximum liquid level in the tank, N2 represents the lower limit of the standard rotational speed, and N2 represents the actual rotational speed.

[0053] The dilution amount is automatically adjusted according to the liquid level to avoid over-dilution at high liquid levels or under-dilution at low liquid levels.

[0054] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A fluorine-containing chemical mixing and stirring tank, characterized by comprising: The application relates to a stirring tank for diluting raw materials, which comprises the following parts: a tank body provided with an inlet valve at the top; a stirring rod arranged in the tank body; a motor arranged at the top of the tank body and drivingly connected with the stirring rod; a plurality of liquid level monitoring modules arranged at different heights on the inner wall of the tank body; a rotating speed sensor arranged on the stirring rod and used for detecting the actual rotating speed of the stirring rod; a controller electrically connected with the motor, the liquid level monitoring modules and the rotating speed sensor, and configured to adjust the output power of the motor to change the rotating speed of the stirring rod according to the liquid level height fed back by the liquid level monitoring modules, the liquid level height being positively correlated with the output power, and the standard rotating speed range of the stirring rod being set under the same output power, the inlet valve being controlled to be opened to supplement dilution raw materials into the tank body if the actual rotating speed is lower than the lower limit of the standard rotating speed range.

2. A fluorine-containing chemical mixing and stirring tank according to claim 1, characterized in that: The number of the liquid level monitoring modules is three, and the liquid level monitoring modules are arranged on the upper, middle and lower sidewalls of the tank body.

3. A fluorine-containing chemical mixing and stirring tank according to claim 1, characterized in that: The application further comprises a feeding pipe and a dilution raw material storage tank, and the inlet valve is connected with the dilution raw material storage tank through the feeding pipe.

4. The fluorine-containing chemical mixing and stirring tank according to claim 1, characterized in that: The stirring rod comprises a main shaft and a plurality of cross-shaped stirring blades, and each cross-shaped stirring blade is arranged on the outer side of the main shaft in a sleeved mode.

5. A fluorine-containing chemical mixing and stirring tank according to claim 4, characterized in that: The lowermost cross-shaped stirring blade is 5-10 cm away from the bottom of the tank body.

6. A fluorine-containing chemical mixing and stirring tank according to claim 4, characterized in that: The outer side of each cross-shaped stirring blade is covered with a fluororubber wear-resistant layer, and the cross-shaped stirring blade is provided with flow guide holes, the hole diameter of the flow guide holes gradually increases from the inside to the outside along the radial direction of the blade.

7. A fluorine-containing chemical mixing and stirring tank according to claim 1, characterized in that: The inner wall of the tank body is coated with a polytetrafluoroethylene anticorrosive layer.

8. The fluorine-containing chemical mixing and stirring tank according to claim 1, characterized in that, The controller is further configured to dynamically adjust the supplement amount of the dilution raw materials according to the liquid level height fed back by the liquid level monitoring modules.

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