Stirring device applied to production of 2-isopropyl-2, 3-dimethyl butyronitrile

Abstract

The utility model discloses a stirring device applied to production of 2-isopropyl-2, 3-dimethyl butyronitrile, which comprises a stirring tank, a lifting platform is arranged at the top end of the stirring tank, a stirring shaft is rotatably mounted on the lifting platform, and the bottom end of the stirring shaft movably extends into the stirring tank and is detachably provided with a stirrer; four stirring blades are arranged on the stirrer, each stirring blade is in the shape of a half-moon bent knife and is provided with a sharp sickle surface, and the stirring blades are hard alloy substrates. According to the utility model, the half-moon curved knife shape is adopted, the cutting edge is provided with the sharp sickle surface, the cutting edge is subjected to hardening treatment, and the surface of the cutting edge is covered with the high-hardness coating, so that flaky sodium amide can be effectively cut and crushed, the stirring process is more uniform, the material mixing effect is obviously improved, the reaction speed is accelerated, and the production quality and efficiency of 2-isopropyl-2, 3-dimethyl butyronitrile are improved.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, and in particular to a stirring device used in the production of 2-isopropyl-2,3-dimethylbutyronitrile. Background Technology

[0002] 2-Isopropyl-2,3-dimethylbutyronitrile (2-isopropyl-2,3-dimethylbutyronitrile) is a crucial chemical intermediate with wide applications in pharmaceuticals, pesticides, and many other fields. Sodium amide, as a key raw material, is typically found in flake form during its production. To accelerate the reaction, the flake sodium amide needs to be broken into smaller particles by stirring; therefore, the stirring device plays a vital role in the entire production process.

[0003] However, existing stirring devices have many problems that urgently need to be solved. In terms of stirring efficiency, most traditional stirring devices use simple impeller designs. This impeller design cannot effectively break up flaky sodium amide, resulting in insufficient dispersion of sodium amide in the reaction system, which in turn leads to a slow reaction rate and seriously affects the production efficiency of 2-isopropyl-2,3-dimethylbutyronitrile.

[0004] Regarding the crushing effect, the blades of existing stirring devices have relatively blunt edges, lacking the ability to efficiently cut flaky raw materials. This makes it difficult to fully crush flaky sodium amide into small particles, resulting in uneven particle size distribution in the reaction system, which in turn affects the uniformity of the reaction and ultimately has an adverse impact on product quality.

[0005] Energy consumption is also a major drawback of existing mixing devices. Due to low mixing efficiency, traditional devices require longer mixing times to achieve a certain mixing and crushing effect, and also require higher energy consumption to maintain the mixing process. This undoubtedly increases production costs and reduces the economic benefits for enterprises.

[0006] In terms of temperature control, some existing stirring devices also have significant shortcomings. For example, in a method for preparing 2,2-diisopropylpropionitrile disclosed in existing patent CN103242194A, the stirring device relies on an external temperature control device in the reaction vessel for temperature regulation. However, this design easily leads to uneven temperature distribution, causing temperature differences in different parts of the reaction system, thereby reducing reaction efficiency.

[0007] Another example is the temperature-controlled stirrer proposed in patent CN202020636328. Although it has a certain temperature control capability, its stirring blades are designed in a traditional flat shape, resulting in limited crushing effect. Moreover, the temperature control unit of this stirrer is separate from the stirring mechanism, making it impossible to achieve precise control of the material temperature, which also affects the reaction process and product quality.

[0008] In summary, existing mixing devices generally suffer from problems such as limited blade shape, insufficient crushing capacity, lack of efficient cutting design for flaky materials, and imprecise temperature control. These issues collectively lead to low reaction efficiency. Therefore, developing a mixing device that can effectively improve mixing efficiency, enhance crushing effect, reduce energy consumption, and achieve precise temperature control is of significant practical importance. Utility Model Content

[0009] To address the problems mentioned in the background section, this invention provides a stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile includes a stirring tank, a lifting platform at the top of the stirring tank, a stirring shaft rotatably mounted on the lifting platform, and a stirrer detachably mounted at the bottom end of the stirring shaft extending into the interior of the stirring tank.

[0012] The stirrer is equipped with four stirring blades, which are crescent-shaped and have sharp sickle-shaped surfaces. The stirring blades are made of hard alloy substrate.

[0013] The stirring blades have internal channels for hot and cold media, and the stirring shaft has internal channels for hot and cold media. The top of the stirring shaft is rotatably connected to a rotary joint, which is fixed to the top of the lifting platform. The rotary joint has inlets and outlets for hot and cold media. Hot and cold media are introduced into the stirring shaft through the inlets and outlets, then flow through each stirring blade in sequence, then flow back to the stirring shaft, and finally flow out from the inlets and outlets.

[0014] Preferably, a hydraulic cylinder is fixed to the top of the mixing tank, the output shaft of the hydraulic cylinder is fixed to the bottom of the lifting platform, a guide rod is fixed to the bottom of the lifting platform, a guide sleeve is fixed to the top of the mixing tank, and the bottom end of the guide rod extends into the guide sleeve.

[0015] Preferably, a rotary motor is fixed to the top of the lifting platform, a first pulley is fixed to the output shaft of the rotary motor, a second pulley is fixed to the outside of the stirring shaft, and a synchronous belt is provided between the outer sides of the first pulley and the second pulley.

[0016] Preferably, the stirrer is inserted into the bottom end of the stirring shaft, a first positioning ring is fixed at the bottom end of the stirring shaft, a plurality of positioning pins are fixed at the top end of the stirrer, and positioning holes are opened on the first positioning ring at positions corresponding to the positioning pins.

[0017] Preferably, a sealing shell is fixed to the outside of the stirring shaft near its bottom end. A limiting ring is rotatably installed on the stirring shaft inside the sealing shell. The limiting ring has a groove corresponding to the positioning pin, and a limiting groove is opened on the side of the positioning pin near the limiting ring. A toothed ring is fixed to the top of the limiting ring. An adjusting shaft is rotatably installed on the sealing shell. A gear is fixed to the bottom of the adjusting shaft, and the gear meshes with the toothed ring. A knob is fixed to the top of the adjusting shaft extending to the outside of the sealing shell. A spring is connected between the toothed ring and the inner wall of the sealing shell.

[0018] Preferably, the bottom end of the first positioning ring is provided with multiple positioning grooves, and the top end of the stirrer is fixed with multiple positioning protrusions, which are engaged in the positioning grooves.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. High-efficiency mixing and crushing: The mixing blades adopt a crescent shape with a sharp sickle-shaped surface. Combined with its specific arc, blade angle, length, width, thickness and other dimensions, as well as its symmetrical distribution and installation angle, and the hardened blades with a high-hardness coating, it can effectively cut and crush flaky sodium amide. The mixing process is more uniform, significantly improving the material mixing effect, accelerating the reaction rate, and improving the production quality and efficiency of 2-isopropyl-2,3-dimethylbutyronitrile.

[0021] 2. Precise temperature control: The stirring blades and stirring shaft are equipped with hot and cold medium circulation channels, which are connected to the external hot and cold medium system through a rotary joint. This enables precise control of the material temperature and allows for rapid adjustment of the material temperature according to the production process, providing a suitable temperature environment for the reaction, improving reaction efficiency and product quality, and avoiding the problem of low reaction efficiency caused by poor temperature control.

[0022] 3. Convenient agitator assembly and disassembly: The agitator and agitator shaft are connected by a plug-in joint. Initial positioning is achieved through positioning pins, positioning holes, positioning protrusions, and positioning grooves. Further positioning and fixation are achieved using structures such as limit rings, grooves, limit slots, gear rings, gears, knobs, and springs. This design makes the agitator easy and quick to disassemble and install. When wear occurs or replacement is needed, it can be quickly assembled and disassembled, reducing downtime, improving production efficiency, and facilitating equipment maintenance and repair.

[0023] 4. Expand the mixing range: The lifting platform is raised and lowered by a hydraulic cylinder, thereby adjusting the height of the mixing shaft. This allows the mixer to move up and down during the mixing process, increasing the mixing range, reducing dead zones, and further improving mixing efficiency, thus overcoming the limitation of the limited mixing range of traditional mixing devices. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a perspective view of the present utility model;

[0026] Figure 2 This is a front-view sectional view of the present invention;

[0027] Figure 3 This is a perspective view of the connection between the stirring shaft and the stirrer of this utility model.

[0028] Figure 4 for Figure 3 Enlarged detail image of position A in the middle;

[0029] Figure 5 This is a first-view perspective perspective view of the stirring shaft and stirrer of this utility model in the separated state.

[0030] Figure 6 for Figure 5 Enlarged detail image of position B in the middle;

[0031] Figure 7 This is a second-view perspective perspective view of the stirring shaft and stirrer of this utility model in a separated state.

[0032] Figure 8 This is a top view of the stirrer of this utility model;

[0033] In the diagram: 1. Mixing tank; 2. Lifting platform; 201. Hydraulic cylinder; 202. Guide sleeve; 203. Guide rod; 204. Rotary motor; 205. First pulley; 3. Mixing shaft; 301. Second pulley; 302. Limiting ring; 3021. Groove; 303. Gear ring; 3031. Spring; 304. Sealing shell; 3041. Adjusting shaft; 3042. Gear; 3043. Knob; 305. First positioning ring; 4. Agitator; 401. Mixing blade; 402. Positioning protrusion; 403. Positioning pin; 4031. Limiting groove; 5. Rotary joint; 501. Hot and cold medium inlet and outlet. Detailed Implementation

[0034] 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 embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Example 1

[0036] Reference Figure 1-8 A stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile includes a stirring tank 1, a lifting platform 2 at the top of the stirring tank 1, a stirring shaft 3 rotatably mounted on the lifting platform 2, and a stirrer 4 detachably mounted at the bottom end of the stirring shaft 3 into the interior of the stirring tank 1.

[0037] The stirrer 4 is equipped with four stirring blades 401. The stirring blades 401 are crescent-shaped and have sharp sickle surfaces. The stirring blades 401 are made of hard alloy substrate. The cross section of the stirring blades 401 is arc-shaped with an arc of 120-150°. The bending direction is consistent with the rotation direction of the stirring shaft 3.

[0038] The sickle-shaped cutting edge angle is 20-30°, and the sickle-shaped design of the stirring blade 401 can effectively cut and crush flaky sodium amino acid.

[0039] The length of the stirring blade 401 is 1 / 3 to 1 / 2 of the inner diameter of the mixing tank 1, the width is 1 / 4 to 1 / 3 of the length, the root thickness is 5-8 mm, and the tip thickness is 2-3 mm, so as to ensure the structural strength and crushing effect of the stirring blade 401 when rotating at high speed.

[0040] The four stirring blades 401 are symmetrically distributed, making the stirring process more uniform;

[0041] The included angle between adjacent stirring blades 401 is 90°. The installation angle between each stirring blade 401 and the stirring shaft 3 is 15-30°.

[0042] Each stirring blade 401 has a single-sided sharpened sickle-shaped edge, with the cutting edge located at the front end of the stirring blade 401 and facing the rotation direction of the stirring shaft 3. The cutting edge of the sickle-shaped edge has been hardened to a hardness of HRC55-60.

[0043] The surface of the stirring blade 401 is covered with a laser-clad tungsten carbide coating with a thickness of 50-100μm and a hardness ≥HRC60.

[0044] The stirring blade 401 has a hot and cold medium flow channel inside, and the stirring shaft 3 has a hot and cold medium flow channel inside. The top end of the stirring shaft 3 is rotatably connected to the rotary joint 5, and the rotary joint 5 is fixed to the top end of the lifting platform 2. The rotary joint 5 has a hot and cold medium inlet and outlet 501. The hot and cold medium is introduced into the stirring shaft 3 through the hot and cold medium inlet and outlet 501, then flows through each stirring blade 401 in sequence, then flows back to the stirring shaft 3, and then flows out from the hot and cold medium inlet and outlet 501.

[0045] Hydraulic cylinder 201 is fixed at the top of mixing tank 1. The output shaft of hydraulic cylinder 201 is fixed to the bottom of lifting platform 2. Guide rod 203 is fixed at the bottom of lifting platform 2. Guide sleeve 202 is fixed at the top of mixing tank 1. The bottom of guide rod 203 extends into guide sleeve 202.

[0046] The lifting platform 2 can be moved up and down by the hydraulic cylinder 201, which in turn can adjust the height of the stirring shaft 3, so that the stirrer 4 can move up and down during the stirring process, increasing the stirring range, reducing the number of dead zones, and improving the stirring efficiency.

[0047] The top of the lifting platform 2 is fixed with a rotary motor 204, and the output shaft of the rotary motor 204 is fixed with a first pulley 205. The outside of the stirring shaft 3 is fixed with a second pulley 301. A synchronous belt is provided between the outer sides of the first pulley 205 and the second pulley 301. The rotary motor 204 can drive the first pulley 205 to rotate, and then drive the second pulley 301 to rotate through the transmission of the synchronous belt, thereby driving the stirring shaft 3 to rotate. Since the rotary motor 204 is fixed on the lifting platform 2, it can follow the lifting and moving, thereby driving the stirring shaft 3 to rotate while lifting and moving. During the stirring process, the height of the stirrer 4 is continuously adjusted, which can effectively improve the stirring and crushing effect.

[0048] The stirrer 4 is inserted into the bottom end of the stirring shaft 3. A first positioning ring 305 is fixed at the bottom end of the stirring shaft 3, and multiple positioning pins 403 are fixed at the top end of the stirrer 4. Positioning holes are opened on the first positioning ring 305 at positions corresponding to the positioning pins 403. When the stirrer 4 is inserted into the bottom end of the stirring shaft 3, the positioning pins 403 are inserted into the positioning holes, which can improve the stability of the fit between the stirrer 4 and the stirring shaft 3, so that the two will not rotate.

[0049] A sealing shell 304 is fixed to the outside of the stirring shaft 3 near its bottom end. A limiting ring 302 is rotatably mounted on the stirring shaft 3 inside the sealing shell 304. The limiting ring 302 has a groove 3021 corresponding to the positioning pin 403, and the positioning pin 403 has a limiting groove 4031 on the side near the limiting ring 302. A gear ring 303 is fixed to the top of the limiting ring 302. An adjusting shaft 3041 is rotatably mounted on the sealing shell 304. A gear 3042 is fixed to the bottom of the adjusting shaft 3041, and the gear 3042 meshes with the gear ring 303. A knob 3043 is fixed to the top of the adjusting shaft 3041 extending to the outside of the sealing shell 304. A spring 3031 connects the gear ring 303 and the inner wall of the sealing shell 304. When the spring 3031 is in a relaxed state, the groove 3021 and the positioning pin 403 are engaged. The positioning pins 403 are precisely staggered. When installing the stirrer 4, first turn the knob 3043 with a tool to drive the gear ring 303 to rotate. Since the gear rings 303 mesh with each other, they can drive the limiting ring 302 to rotate, so that the grooves 3021 on the limiting ring 302 correspond one-to-one with the positioning pins 403. At this time, insert the stirrer 4 to ensure that the positioning pins 403 pass through the grooves 3021 and the limiting ring 302. Then, release the knob 3043. Due to the restoring force of the spring 3031, the limiting ring 302 can be pulled back to its initial state. At this time, the limiting ring 302 is stuck in the limiting groove 4031, which can ensure that the stirring shaft 3 and the stirrer 4 will not move axially and separate, thereby achieving the purpose of quickly installing the stirrer 4. The same principle applies to disassembly, which can easily replace the stirrer 4 and improve the convenience of maintenance and repair of the device.

[0050] The bottom end of the first positioning ring 305 is provided with multiple positioning grooves, and the top end of the stirrer 4 is fixed with multiple positioning protrusions 402. The positioning protrusions 402 are stuck in the positioning grooves, which can further improve the stability of the connection between the stirrer 4 and the stirring shaft 3 and improve the strength against torsion during the stirring process.

[0051] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0053] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0054] The above description is only a preferred 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 technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stirring apparatus for the production of 2-isopropyl-2,3-dimethylbutyronitrile, comprising a stirring tank (1), characterized in that: The top of the mixing tank (1) is provided with a lifting platform (2), and a stirring shaft (3) is rotatably installed on the lifting platform (2). The bottom end of the stirring shaft (3) extends into the interior of the mixing tank (1) and is detachably equipped with a stirrer (4). The stirrer (4) is provided with four stirring blades (401). The stirring blades (401) are crescent-shaped and have sharp sickle surfaces. The stirring blades (401) are made of hard alloy substrate. The stirring blade (401) has a hot and cold medium flow channel inside, and the stirring shaft (3) has a hot and cold medium flow channel inside. The top of the stirring shaft (3) is rotatably connected to the rotary joint (5). The rotary joint (5) is fixed to the top of the lifting platform (2). The rotary joint (5) has a hot and cold medium inlet and outlet (501). The hot and cold medium is introduced into the stirring shaft (3) through the hot and cold medium inlet and outlet (501), then flows through each stirring blade (401) in sequence, then flows back to the stirring shaft (3), and then flows out from the hot and cold medium inlet and outlet (501).

2. The stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile according to claim 1, characterized in that: A hydraulic cylinder (201) is fixed at the top of the mixing tank (1). The output shaft of the hydraulic cylinder (201) is fixed to the bottom of the lifting platform (2). A guide rod (203) is fixed at the bottom of the lifting platform (2). A guide sleeve (202) is fixed at the top of the mixing tank (1). The bottom of the guide rod (203) extends into the guide sleeve (202).

3. The stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile according to claim 1, characterized in that: The top of the lifting platform (2) is fixed with a rotary motor (204), the output shaft of the rotary motor (204) is fixed with a first pulley (205), the outside of the stirring shaft (3) is fixed with a second pulley (301), and a synchronous belt is provided between the outer sides of the first pulley (205) and the second pulley (301).

4. The stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile according to claim 1, characterized in that: The stirrer (4) is inserted into the bottom end of the stirring shaft (3). The bottom end of the stirring shaft (3) is fixed with a first positioning ring (305). The top end of the stirrer (4) is fixed with multiple positioning pins (403). Positioning holes are opened on the first positioning ring (305) at positions corresponding to the positioning pins (403).

5. The stirring device for the production of 2-isopropyl-2,3-dimethylbutyronitrile according to claim 4, characterized in that: A sealing shell (304) is fixed to the outside of the stirring shaft (3) near the bottom. A limiting ring (302) is rotatably installed on the stirring shaft (3) inside the sealing shell (304). The limiting ring (302) has a groove (3021) corresponding to the positioning pin (403). The positioning pin (403) has a limiting groove (4031) on the side near the limiting ring (302). A toothed ring (303) is fixed to the top of the limiting ring (302). An adjusting shaft (3041) is rotatably installed on the sealing shell (304). A gear (3042) is fixed to the bottom of the adjusting shaft (3041). The gear (3042) meshes with the toothed ring (303). A knob (3043) is fixed to the top of the adjusting shaft (3041) extending to the outside of the sealing shell (304). A spring (3031) is connected between the toothed ring (303) and the inner wall of the sealing shell (304).

6. The stirring apparatus for the production of 2-isopropyl-2,3-dimethylbutyronitrile according to claim 5, characterized in that: The bottom end of the first positioning ring (305) is provided with multiple positioning grooves, and the top end of the stirrer (4) is fixed with multiple positioning protrusions (402), which are stuck in the positioning grooves.

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