Stirring device capable of improving heat exchange efficiency in crystallizing tank

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to a stirring device capable of improving the heat exchange efficiency in a crystallizing tank, which comprises the crystallizing tank, a main shaft is rotatably mounted on the crystallizing tank, the main shaft is in transmission connection with a speed reducing motor, and a first transmission part and a second transmission part with the same structure are mounted at the bottom of the main shaft at an interval up and down. The first transmission part comprises a rotating block, the rotating block is fixedly arranged on the main shaft, the outer side of the rotating block is rotationally sleeved with an outer sleeve, a groove used for installing a pawl and a plate spring is formed in the curved side face of the rotating block, and one end of the pawl is rotationally connected with the rotating block through a pin shaft; the pawls are unidirectionally meshed with ratchet grooves formed in the inner wall of the outer sleeve, an axial-flow stirrer and a paddle stirrer are respectively mounted on the side surfaces of the outer sleeve in the first transmission part and the second transmission part, and the mounting directions of the pawls in the first transmission part and the second transmission part are opposite.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to a stirring device that can improve the heat exchange efficiency inside a crystallizer. Background Technology

[0002] Traditional crystallizer stirring devices mostly employ a single stirring method, such as paddle stirring, anchor stirring, or turbine stirring. These stirring methods play a certain role in promoting solution mixing and improving heat and mass transfer efficiency, but their limitations gradually become apparent when faced with complex and ever-changing crystallization processes. Especially in the early stages of crystal nucleation and crystal growth, a single stirring method often fails to meet the different requirements for stirring intensity and form at different stages.

[0003] In the early stages of crystal nucleation, solute molecules in the solution need to diffuse and collide to form stable crystal nuclei. This process requires the stirring device to provide sufficient shear force and turbulence to promote the uniform distribution of solute molecules and increase the probability of collisions. However, traditional stirring methods often struggle to provide sufficient local shear force while maintaining overall solution mixing, leading to uneven crystal nucleation, low nucleation rate, and even the formation of numerous tiny crystal nuclei. These tiny crystal nuclei are difficult to grow in subsequent processes, thus affecting the purity and particle size distribution of the crystal.

[0004] Once the crystal growth stage begins, the primary task of the stirring device shifts to ensuring a uniform supply of solute molecules to the crystal growth surface, promoting stable and uniform crystal growth. At this point, the stirring intensity should be appropriately reduced to avoid excessive mechanical impact on the crystal, which could lead to breakage or uneven growth rates. However, traditional stirring methods often struggle to precisely control the stirring intensity, resulting in problems such as localized uneven concentrations and significant differences in growth rates during crystal growth, thus affecting crystal quality and yield.

[0005] Furthermore, traditional stirring devices also have shortcomings in heat exchange efficiency. In the early stages of crystal nucleation, high-intensity stirring is required to promote rapid heat transfer and thus increase the nucleation rate. However, traditional stirring methods often fail to meet this requirement, resulting in low heat exchange efficiency and affecting the overall efficiency of the crystallization process. During the crystal growth stage, although the stirring intensity can be appropriately reduced, a certain level of stirring is still needed to ensure a uniform supply of solute molecules. At this stage, if the stirring intensity is too low, it will lead to a decrease in heat exchange efficiency, affecting the crystal growth rate and purity. Summary of the Invention

[0006] To address the above problems, the purpose of this utility model is to provide a stirring device that can improve the heat exchange efficiency inside the crystallization tank, thus solving the problem that traditional stirring devices cannot be adjusted according to the stage of crystal growth to ensure crystallization quality.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a stirring device that can improve the heat exchange efficiency in a crystallizing tank, comprising a crystallizing tank, a main shaft rotatably mounted on the crystallizing tank, a geared motor drivingly connected to the main shaft, and a first transmission component and a second transmission component with identical structures installed at intervals at the bottom of the main shaft. The first transmission component includes a rotating block, which is fixed on the main shaft. An outer sleeve is rotatably fitted on the outer side of the rotating block. A groove for installing a pawl and a leaf spring is provided on the curved side of the rotating block, and one end of the pawl is rotatably connected to the rotating block through a pin. The pawl engages unidirectionally with a ratchet groove opened on the inner wall of the outer sleeve. The two sides of the leaf spring are respectively connected to the pawl and the rotating block. An upper seal and a lower seal are connected to the upper and lower ends of the outer sleeve, and the upper and lower seals are rotatably fitted on the main shaft. An axial flow stirrer and a paddle stirrer are respectively installed on the sides of the outer sleeve in the first and second transmission components, and the installation directions of the pawls in the first and second transmission components are opposite.

[0008] The beneficial effects of this invention are as follows: When the main shaft rotates in different directions, it can drive the axial flow stirrer and the paddle stirrer to rotate through the first and second transmission components respectively. This allows the solvent in the crystallization tank to form an axial flow in the early stage of crystal nucleus formation, so that the solvent can flow fully in the crystallization tank to obtain a high heat exchange efficiency and improve the crystal nucleus forming quality. Then, the drive wall scraper and the paddle stirrer with better uniformity are switched to rotate, so that the solute molecules can be evenly supplied to the growth surface of the crystal, ensuring the crystallization quality.

[0009] To effectively ensure the transmission stability between the rotating block and the outer sleeve;

[0010] As a further improvement to the above technical solution: the number of pawls is multiple, and they are equidistantly spaced around the axis of the rotating block.

[0011] The beneficial effect of this improvement is that multiple pawls can simultaneously engage with the ratchet groove, thereby ensuring the stability of power transmission between the rotating block and the outer sleeve.

[0012] To ensure the stability of the rotating block's installation on the spindle;

[0013] As a further improvement to the above technical solution: the rotating block and the main shaft are interference fit.

[0014] The beneficial effects of this improvement are: the rotating block is firmly connected to the main shaft through an interference fit installation method, thereby ensuring that the axial flow agitator and the paddle agitator rotate stably under the drive of the main shaft.

[0015] To ensure the sealing performance of the connection between the upper and lower seals and the outer sleeve;

[0016] As a further improvement to the above technical solution: a sealing gasket is sandwiched between the rotating block and the outer sleeve, and the inner diameter of the sealing gasket is not less than the inner diameter of the upper sealing element.

[0017] The beneficial effects of this improvement are: the sealing gasket plays a sealing role, effectively preventing solvent from entering the interior of the first and second transmission components through the gaps between the outer sleeve and the upper and lower sealing components.

[0018] To further improve the sealing performance of the first and second transmission components;

[0019] As a further improvement to the above technical solution: a dynamic sealing ring is provided between the upper sealing element, the lower sealing element and the main shaft.

[0020] The beneficial effects of this improvement are: the dynamic sealing ring can effectively seal the connection between the upper and lower seals and the spindle.

[0021] To ensure the end of the pawl is stably engaged in the ratchet groove;

[0022] As a further improvement to the above technical solution: the leaf spring is a V-shaped plate structure.

[0023] The beneficial effects of this improvement are: the leaf spring can provide elastic support for the pawl, so that the end of the pawl is stably locked in the ratchet groove.

[0024] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the crystallization tank of this utility model;

[0027] Figure 3 This is a bottom sectional view of the first transmission component in this utility model;

[0028] Figure 4 This is an enlarged view of A in this utility model;

[0029] In the diagram: 1. Crystallization tank; 2. Main shaft; 3. First transmission component; 4. Second transmission component; 41. Rotating block; 42. Outer sleeve; 43. Ratchet; 44. Pawl; 45. Leaf spring; 46. Upper seal; 47. Lower seal; 48. Dynamic seal ring; 49. Sealing gasket; 5. Axial flow agitator; 6. Paddle agitator. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way. Example

[0031] like Figure 1As shown in Figure 4: A stirring device for improving heat exchange efficiency in a crystallizer includes a crystallizer 1. A main shaft 2 is rotatably mounted on the crystallizer 1. The main shaft 2 is driven by a geared motor. A first transmission component 3 and a second transmission component 4 with identical structures are installed at intervals on the bottom of the main shaft 2. The first transmission component 3 includes a rotating block 41, which is fixed to the main shaft 2. An outer sleeve 42 is rotatably fitted onto the outer side of the rotating block 41. A groove for mounting a pawl 44 and a leaf spring 45 is provided on the curved side of the rotating block 41. One end of the pawl 44 is rotatably connected to the rotating block 41 via a pin. The pawl 44 engages unidirectionally with a ratchet groove 43 on the inner wall of the outer sleeve 42. The leaf spring 45 has pawls 44 and rotating blocks 41 connected to its two sides respectively. The upper and lower ends of the outer sleeve 42 are connected to an upper seal 46 and a lower seal 47. The upper seal 46 and lower seal 47 are rotatably mounted on the main shaft 2. An axial flow stirrer 5 and a paddle stirrer 6 are respectively installed on the sides of the outer sleeve 42 in the first transmission member 3 and the second transmission member 4. The pawls 44 in the first transmission member 3 and the second transmission member 4 are installed in opposite directions. When the main shaft 2 rotates in different directions, it can drive the axial flow stirrer 5 and the paddle stirrer 6 to rotate through the first transmission member 3 and the second transmission member 4 respectively. This causes the solvent in the crystallization tank 1 to form an axial flow in the early stage of crystal nucleus formation, thus allowing the solvent to... The crystallizer 1 achieves high heat exchange efficiency by ensuring sufficient flow within the crystallizer, thus improving the crystal nucleus formation quality. Then, the drive scraper and the paddle agitator 6, which provides better uniformity, are switched to rotate, ensuring that solute molecules are evenly supplied to the crystal growth surface and guaranteeing crystallization quality. Multiple pawls 44 are equidistantly spaced around the axis of the rotating block 41. These pawls 44 can simultaneously engage with the ratchet groove 43, ensuring stable power transmission between the rotating block 41 and the outer sleeve 42. The rotating block 41 is interference-fitted with the main shaft 2, maintaining a stable connection. This interference fit ensures the axial flow agitator 5 and the paddle agitator 6 operate stably under the drive of the main shaft 2. The rotating block 41 and the outer sleeve 42 are fitted with a sealing gasket 49, and the inner diameter of the sealing gasket 49 is not less than the inner diameter of the upper seal 46. The sealing gasket 49 plays a sealing role, effectively preventing solvent from entering the interior of the first transmission component 3 and the second transmission component 4 through the gap between the outer sleeve 42 and the upper seal 46 and the lower seal 47. A dynamic sealing ring 48 is provided between the upper seal 46, the lower seal 47 and the main shaft 2. The dynamic sealing ring 48 can effectively seal the connection between the upper seal 46, the lower seal 47 and the main shaft 2. The leaf spring 45 has a V-shaped plate structure. The leaf spring 45 can play the role of elastically supporting the pawl 44, so that the end of the pawl 44 is stably locked in the ratchet groove 43.

[0032] The working principle of this technical solution is as follows: In the initial stage of crystal nucleus formation, the reduction motor connected to the main shaft 2 is controlled to rotate clockwise, causing the main shaft 2 to drive the rotating block 41 in the first transmission component 3 and the second transmission component 4 to rotate. At this time, the end of the pawl 44 in the first transmission component 3 is engaged in the ratchet groove 43, driving the outer sleeve 42 to rotate clockwise, which in turn drives the axial flow stirrer 5 to rotate and generate axial flow. The strong axial flow promotes the diffusion and collision of solute molecules, increases the chance of nucleation, and allows the high-speed flowing solvent to contact the inner wall of the crystallization tank 1 for sufficient heat exchange. The pawl 44 in the second transmission component 4 is pushed by the ratchet 43, repeatedly squeezing the leaf spring 45 to produce elastic deformation. After the crystal nucleus is formed, the crystal growth stage begins. The main goal at this time is to ensure that the solute molecules can be evenly supplied to the growth surface of the crystal. The operator controls the geared motor connected to the main shaft 2 to reverse and reduce the speed of the motor, so that the first transmission component 3 is disengaged from the axial flow stirrer 5, and the second transmission component 4 is engaged with the paddle stirrer 6, so that the paddle stirrer 6 rotates, ensuring that the material is evenly distributed in the crystallization tank, reducing dead corners, and facilitating the uniform growth of the crystal.

[0033] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the invention; these examples are merely for the purpose of helping to understand the method and core ideas of the invention. The above descriptions are only preferred embodiments of the invention. It should be pointed out that, due to the limitations of written expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or variations can be made without departing from the principles of the invention, and the above technical features can be combined in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this invention.

Claims

1. A stirring device that can improve the heat exchange efficiency inside a crystallizer, characterized in that: The utility model relates to a crystallization tank, which comprises a crystallization tank (1), a main shaft (2) rotatably installed on the crystallization tank (1), a speed reducer motor connected to the main shaft (2), a first transmission part (3) and a second transmission part (4) of the same structure installed on the bottom of the main shaft (2) at intervals, the first transmission part (3) comprising a rotating block (41) fixed on the main shaft (2), an outer sleeve (42) rotatably sleeved on the outer side of the rotating block (41), a groove for installing a pawl (44) and a leaf spring (45) formed on the curved side of the rotating block (41), one end of the pawl (44) rotatably connected to the rotating block (41) through a pin shaft, the pawl (44) one-way engaged with a ratchet groove (43) formed on the inner wall of the outer sleeve (42), the leaf spring (45) connected to the pawl (44) and the rotating block (41) on both sides, the upper and lower ends of the outer sleeve (42) connected to an upper sealing element (46) and a lower sealing element (47), the upper sealing element (46) and the lower sealing element (47) rotatably sleeved on the main shaft (2), the side surface of the outer sleeve (42) in the first transmission part (3) and the second transmission part (4) respectively installed with an axial flow type stirrer (5) and a paddle type stirrer (6), and the installation direction of the pawl (44) in the first transmission part (3) and the second transmission part (4) is opposite.

2. The stirring device for improving the heat exchange efficiency in a crystallization tank according to claim 1, characterized in that: The number of the pawl (44) is multiple, and the pawl (44) is arranged at equal intervals around the axis of the rotating block (41).

3. The stirring device for improving the heat exchange efficiency in a crystallization tank according to claim 1, characterized in that: The rotating block (41) is in interference fit with the main shaft (2).

4. The stirring device for improving the heat exchange efficiency in a crystallization tank according to claim 1, characterized in that: A sealing gasket (49) is clamped between the rotating block (41) and the outer sleeve (42), and the inner diameter of the sealing gasket (49) is not less than the inner diameter of the upper sealing element (46).

5. The stirring device for improving the heat exchange efficiency in a crystallization tank according to claim 1, characterized in that: A dynamic sealing ring (48) is arranged between the upper sealing element (46), the lower sealing element (47) and the main shaft (2).

6. The stirring device for improving the heat exchange efficiency in a crystallization tank according to claim 1, characterized in that: The leaf spring (45) is a V-shaped plate structure.

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