Hollow stirring paddle reaction kettle

Abstract

The invention discloses a reaction kettle with a hollow stirring paddle. The reaction kettle comprises a driving structure and a stirring reaction structure, the stirring reaction structure comprises a double-layer kettle body and a hollow stirring rod arranged in an inner cavity of the double-layer kettle body, a feeding hole is formed in the top of the hollow stirring rod, the bottom of the hollow stirring rod is of an open structure, and stirring blades are arranged on the side wall, so that raw materials can be directly conveyed to the central area of the bottom of the kettle body from the top of the kettle cover through the hollow stirring rod. The driving structure drives the hollow stirring rod to rotate in a motor and synchronous wheel belt transmission mode, an effective flow field is formed in the stirring process, and the mixing efficiency is improved. The reaction kettle further comprises a sealing bearing, a movable sealing ring, a jacket cooling structure and a movable support assembly, has the advantages of directional feeding, efficient stirring, reliable sealing, compact structure and the like, and is suitable for liquid-phase or multi-phase reaction processes in the fields of chemical engineering, pharmacy, food and the like.

Description

Technical Field

[0001] The invention relates to the technical field of reactors, in particular to a hollow stirring paddle reactor. Background Art

[0002] Reactors are commonly used in the chemical, pharmaceutical, metallurgical, food, and energy industries, and are widely used in processes such as reactions, mixing, extraction, emulsification, and polymerization of multiphase systems, such as liquid-liquid, liquid-solid, or gas-liquid systems. Reactors come in a variety of configurations, typically including a reactor body, a stirring mechanism, a heating / cooling jacket, a sealing system, and a power transmission device. The stirring mechanism is a key component that determines the efficiency and uniformity of mass transfer in reactions.

[0003] Traditional reactors generally use a solid stirring shaft structure. Raw materials are added through the top of the reactor or the side of the reactor cover through the feeding port. The materials diffuse under the action of gravity or rely on paddle stirring to achieve uniform mixing. However, in actual operation, this "top feeding" method has multiple technical bottlenecks:

[0004] On the one hand, since the raw material addition position is far away from the main mixing zone of the reactants, especially in high-viscosity or adhesive material systems, top feeding may cause some raw materials to remain on the surface, resulting in a concentration gradient, affecting the reaction rate and product quality; on the other hand, most traditional stirring blades are installed on the central axis or lower area, and cannot form an effective flow field through-path, resulting in stirring blind spots and material dead corners in the central area of the bottom of the kettle body. In severe cases, it may even cause local heat accumulation, side reactions or material sintering.

[0005] Furthermore, while solid agitator shafts provide sufficient strength, they also limit the ability to achieve hollow functions. This makes it impossible to integrate multiple functions such as directional feeding, cooling, and sampling, resulting in a complex system, cumbersome operation, and inconvenient cleaning. Traditional structures are particularly inadequate for applications such as fine chemicals, polymer polymerization, and bioreactions, which require extremely high temperature, mixing uniformity, and reaction efficiency.

[0006] In terms of power transmission of the agitator shaft, direct coupling or gear transmission structure is currently commonly used. Although the structure is simple, the bearing load is large, the noise is high during operation, maintenance is frequent, the sealing performance is poor, and the shaft end is prone to liquid leakage, corrosion and even breakage, affecting production safety and system reliability.

[0007] Therefore, in view of the above technical status quo, there is an urgent need for a reactor structure with hollow feeding function, reasonable flow field distribution, strong stirring uniformity, high mass transfer efficiency, good sealing and maintainability to meet the needs of the new generation of efficient, intelligent and clean continuous processes.

[0008] Based on the above problems, the present invention proposes a hollow stirring paddle reactor with a novel structure, which cleverly integrates the raw material feeding channel into the interior of the stirring rod, and is equipped with high-efficiency blades and sealed bearing structures. It not only solves the problem that traditional reactors cannot add materials directly to the center of the bottom of the reactor, but also improves the stirring efficiency and the overall sealing performance of the system. It has good industrial adaptability and technological innovation value.

[0009] Therefore, it is urgent to design a hollow stirring paddle reactor to solve these problems. Summary of the Invention

[0010] The purpose of the present invention is to provide a hollow stirring paddle reactor to address the deficiencies of the prior art and to solve the problems raised in the background technology.

[0011] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a hollow stirring paddle reactor, comprising a driving structure and a stirring reaction structure, wherein the stirring reaction structure comprises a double-layer reactor body and a hollow stirring paddle, wherein the hollow stirring rod is connected to the output end of the driving structure, and the hollow stirring rod is located in the inner cavity of the double-layer reactor body, the side wall of the hollow stirring rod is provided with a stirring paddle, both ends of the hollow stirring rod are open structures, and the top opening is a feed port.

[0012] As a preferred technical solution of the present invention, a reactor cover is provided on the double-layer reactor body, and the reactor cover is connected to the motor support plate via a supporting column.

[0013] As a preferred technical solution of the present invention, the driving structure includes a motor, the output shaft of the motor is provided with a synchronous wheel 1, the synchronous wheel 1 is provided with a synchronous belt, the other end of the synchronous belt is sleeved on the synchronous wheel 2, the synchronous wheel 2 is fixedly mounted on the hollow stirring rod, and the motor is fixedly mounted on the motor support plate.

[0014] As a preferred technical solution of the present invention, a hole for a hollow stirring rod to pass through is provided on the lid of the reactor, and a sealed bearing is provided on the hole.

[0015] As a preferred technical solution of the present invention, a hole for installing a bearing is opened on the motor support plate, the bearing is installed on the hollow stirring rod, and a dynamic sealing ring is provided in the bearing.

[0016] As a preferred technical solution of the present invention, the double-layer kettle body is fixed on a bracket, and casters are provided at the bottom of the four corners of the bracket.

[0017] As a preferred technical solution of the present invention, a right discharge port is provided at the bottom of the double-layer kettle body.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] By designing the feed channel as an integrated hollow stirring rod, this invention allows raw materials to enter through the top feed port and be directly introduced into the center area of the bottom of the reactor body through the inner cavity of the stirring rod, breaking the limitation of traditional reactors that only feed materials from the top or side walls. This structure can accurately deliver raw materials to the area where the stirring blades are active, effectively avoiding uneven mixing, reaction delays, and material waste caused by material accumulation on the surface. It is particularly suitable for fine chemical and pharmaceutical processes that require high initial mixing accuracy.

[0020] The stirring blades in this invention are arranged on the outer wall of the hollow stirring rod. Their rotation creates a three-dimensional spiral flow field, providing excellent axial and radial circulation capabilities. This significantly enhances fluid disturbance within the reactor, breaking up aggregated particles and promoting full contact between reactants, thereby significantly improving mass transfer efficiency and heat exchange rates between reactants. Combined with a double-jacketed temperature control structure, this allows for efficient mixing and precise thermal control during complex reactions, improving product yield and reaction safety.

[0021] By providing a sealed bearing (for the shaft penetrating the reactor cover) and a dynamic seal (for supporting the motor drive), this invention solves the problems of leakage and shaft wear during the rotation of the hollow agitator shaft, enhancing the system's sealing performance and corrosion resistance. Furthermore, the use of a synchronous belt drive structure offers the advantages of low noise and easy maintenance. The equipment boasts high operational stability, is suitable for continuous reaction conditions, and meets the comprehensive requirements of modern production for cleanliness, safety, and maintainability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 : A structural diagram of a hollow stirring paddle reactor system proposed in the present invention;

[0023] Figure 2 : A structural diagram of the hollow stirring paddle reactor system proposed in the present invention.

[0024] Among them, 1 caster; 2 bracket; 3 discharge port; 4 stirring blade; 5 double-layer kettle body; 6 hollow stirring rod; 7 reactor lid; 8 feed port; 10 motor support plate; 11 support column; 12 motor; 13 dynamic sealing ring; 14 bearing; 15 synchronous wheel 1; 16 synchronous belt. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The present invention relates to a hollow agitator reactor, particularly suitable for pilot and industrialized reaction processes in the chemical, pharmaceutical, and materials industries, such as liquid-liquid mixing, solid-liquid dispersion, heat transfer enhancement, and directional feeding requirements. This device addresses engineering and technical issues such as uneven feeding, blind mixing areas, low heat exchange efficiency, and shaft seal leakage associated with traditional reactors. It offers significant advantages such as a compact structure, multiple functions, and stable operation.

[0027] This hollow paddle reactor consists of a drive structure and a stirring reaction mechanism. The core of the stirring reaction mechanism is a double-layered kettle 5, which features an inner and outer tube-in-tube structure. The middle layer allows for cooling water or thermal oil to flow through, forming a highly efficient heat exchange channel, thereby enabling dynamic temperature control of the reaction system. A discharge port 3 is located on the outer bottom of the double-layered kettle for rapid discharge of material after the reaction is completed, avoiding any residual material in dead corners.

[0028] A hollow stirring rod 6 is vertically arranged in the center of the kettle body. The stirring rod is made of corrosion-resistant stainless steel and has a hollow structure as a whole, with openings at both ends. The top opening is the raw material feed port 8, which is connected to the external raw material delivery pipeline to achieve quantitative and constant-speed continuous feeding. After the material enters through the feed port, it flows downward along the cavity under the action of gravity and is directly injected into the reaction zone at the bottom of the kettle body from the outlet at the bottom end of the stirring rod. This "hollow direct injection" method innovatively solves the problem that traditional reactors can only be fed from the top or side wall. It is particularly suitable for the precise addition of high-viscosity, high-shear or reaction-sensitive substances, greatly improving the uniformity of material distribution and the initial mixing efficiency, and enhancing the temperature control and rate regulation capabilities of the reaction.

[0029] Several stirring blades 4 are evenly welded to the sidewalls of the hollow stirring shaft. These blades feature a twisted, sheet-like structure, creating a combined tangential and axial flow disturbance. As the stirring shaft rotates, the blades generate spiral vortices that powerfully break up material agglomerates, increasing material circulation between different layers, effectively eliminating dead zones, and enhancing mass transfer at the solid-liquid interface.

[0030] The stirring rod's rotation is powered by a drive structure located above. This drive structure comprises a motor 12, a motor support plate 10, a synchronous pulley 15, a synchronous belt 16, and a synchronous pulley 2 17. The motor is fixedly mounted on the motor support plate 10, with its output shaft connected to synchronous pulley 15. Its power is transmitted via the synchronous belt 16 to synchronous pulley 2 17, connected to the upper end of the hollow stirring rod 6, thereby driving the entire stirring rod's rotation. This belt drive structure offers advantages such as low noise, minimal vibration, smooth operation, and ease of maintenance and adjustment.

[0031] To ensure long-term stable operation of the stirring system, the reactor lid 7 is removable and sealed to the reactor body via a flange, facilitating easy cleaning and maintenance. A central axial hole is provided in the lid for the hollow stirring rod 6 to penetrate the reactor. To prevent material leakage along the axis during rotation, a sealed bearing 18 is located in this hole. The bearing cavity is filled with high-temperature and corrosion-resistant materials, adapting to various reaction conditions.

[0032] The motor support plate 10 is fixed to the sides of the kettle cover by two supporting columns 11 on the left and right. A bearing hole is provided in the center of the support plate for mounting a precision rolling bearing 14. This bearing is mounted on the upper part of the stirring rod and forms a sealed transition zone with its outer shell through a dynamic sealing ring 13. This ensures that the stirring shaft can maintain excellent sealing and mechanical stability even at high speeds, preventing liquid leakage and external air ingress.

[0033] To enhance operational convenience and flexibility, the double-layered kettle 5 is secured to a rectangular metal bracket 2. Lockable universal casters 1 are located at each corner of the bracket, facilitating easy movement and positioning within a laboratory or pilot plant. The discharge port 3 features a flange interface for connecting to an external valve or downstream piping, enabling rapid discharge by weight-assisted bottom-loading.

[0034] This reactor can be used in conjunction with a peristaltic pump, metering pump, constant temperature oil bath, cooling circulator and PLC control module to achieve precise control of parameters such as feed flow, reaction temperature and stirring speed. It is particularly suitable for reaction processes such as oxidation, condensation, polymerization and emulsification that require strict mass transfer and temperature control.

[0035] In summary, the hollow stirring paddle reactor solves the key problems of the existing equipment such as unreasonable feeding path, low stirring efficiency, poor sealing effect, slow heat exchange reaction, etc. through its ingenious structural design and optimized integration of process parameters. It is suitable for the synthesis and preparation of intermediates and finished products in multiple industries such as chemical, pharmaceutical, biological, and metallurgical industries, and has good engineering adaptability and industrial promotion value.

[0036] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hollow stirring paddle reactor, comprising a driving structure and a stirring reaction structure, characterized in that: The stirring reaction structure comprises a double-layer kettle body (5) and a hollow stirring paddle (6), wherein the hollow stirring rod (6) is connected to the output end of the driving structure, and the hollow stirring rod (6) is located in the inner cavity of the double-layer kettle body (5), and the side wall of the hollow stirring rod (6) is provided with a stirring paddle (4), and both ends of the hollow stirring rod (6) are open structures, and the top opening thereof is a feed port (8).

2. A hollow stirring paddle reactor according to claim 1, characterized in that: A reactor cover (7) is provided on the double-layer reactor body (5), and the reactor cover (7) is connected to the motor support plate (10) via a supporting column (11).

3. A hollow stirring paddle reactor according to claim 1, characterized in that: The driving structure comprises a motor (12), an output shaft of the motor (12) is provided with a synchronous wheel (15), a synchronous belt (16) is sleeved on the synchronous wheel (15), the other end of the synchronous belt (16) is sleeved on the synchronous wheel (17), the synchronous wheel (17) is fixedly mounted on the hollow stirring rod (6), and the motor (12) is fixedly mounted on the motor support plate (10).

4. A hollow stirring paddle reactor according to claim 1, characterized in that: The reactor cover (7) is provided with a hole for the hollow stirring rod (6) to pass through, and a sealing bearing (18) is provided on the hole.

5. A hollow stirring paddle reactor according to claim 3, characterized in that: The motor support plate (10) is provided with a hole for installing a bearing (14), the bearing (14) is installed on the hollow stirring rod (6), and a dynamic sealing ring (13) is provided in the bearing (14).

6. A hollow stirring paddle reactor according to claim 1, characterized in that: The double-layer kettle body (5) is fixed on the bracket (2), and casters (1) are provided at the bottom of the four corners of the bracket (2).

7. The hollow stirring paddle reactor according to claim 1, characterized in that: A right discharge port (3) is provided at the bottom of the double-layer kettle body (5).

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