Anti-settling radial flow stirring impeller and reaction kettle stirring system

Abstract

The utility model belongs to the technical field of fluid mixing and stirring, and relates to a radial flow stirring impeller capable of preventing sedimentation, comprising: a shaft sleeve, which is used for fixed connection with the end of a stirring shaft; at least one pair of conical coil springs, the small end of the conical coil spring being fixed to the outer surface of the shaft sleeve on the diametrically opposite sides; the axial direction of the conical coil spring and the radial direction of the shaft sleeve form an acute angle, so that when the shaft sleeve rotates with the stirring shaft, the conical coil spring can generate composite disturbance in the radial and axial directions in the fluid. The radial flow stirring impeller can actively adapt to the working condition of the tank bottom, fundamentally prevent the formation of sediment, and has strong breaking capacity for the formed sediment.

Description

Technical Field

[0001] This utility model belongs to the field of fluid mixing and stirring technology, and relates to an anti-settling radial flow stirring impeller. Background Technology

[0002] In mixing processes across industries such as chemical engineering, metallurgy, environmental protection, bio-fermentation, and pharmaceuticals, it is often necessary to handle suspensions containing solid particles. A long-standing technical challenge is that during agitation intervals or when agitation intensity is insufficient, solid particles settle rapidly due to gravity, forming a hard sediment layer at the bottom of the storage tank. This not only affects the uniformity of product quality but can also cause excessive starting torque for the mixer, blockage of the discharge port, or even prevent the mixer from restarting.

[0003] Existing solutions mostly employ traditional propeller impellers and turbine impellers. These rigid impellers have several drawbacks: Fixed flow field: They produce a fixed, programmed flow field (such as axial or radial flow). The flow velocity is high in the region near the impeller, but the energy decreases sharply when it reaches the corner of the tank bottom, which easily forms a "mixing dead zone".

[0004] Poor "solid following": The rigid blades and the sediment at the bottom of the tank are in a "head-on" confrontation. Once the sediment layer has formed, the blades can only push or cut a portion of the sediment when they sweep across, and cannot effectively penetrate and stir up the entire sediment layer, resulting in high energy consumption and low efficiency.

[0005] Easily clogged and jammed: For fibrous or easily agglomerated solids, rigid blades are prone to entanglement and clogging.

[0006] Therefore, there is an urgent need in this field for an impeller structure that can actively adapt to the working conditions at the bottom of the tank, fundamentally prevent the formation of sediment, and have a strong ability to break up existing sediment. Summary of the Invention

[0007] This invention addresses the aforementioned problems by providing an anti-settling radial flow stirring impeller that can actively adapt to the working conditions at the bottom of the tank, fundamentally prevent sedimentation, and has a strong ability to break up existing sediment.

[0008] According to the technical solution of this utility model: a radial flow stirring impeller for preventing settling, characterized in that it comprises: A bushing is used for a fixed connection to the end of the stirring shaft. Connecting rods fixed to the radially opposite sides of the bushing; At least one pair of conical helical springs, the small end of which is fixed to the connecting rod.

[0009] As a further improvement of this utility model, the axial direction of the conical helical spring forms an acute angle with the radial direction of the bushing, so that when the bushing rotates with the stirring shaft, the conical helical spring can generate a combined radial and axial disturbance in the fluid.

[0010] As a further improvement of this utility model, the helical profile of the conical helical spring is one of the following: linear variation type, equal pitch type, or equal helical angle type.

[0011] As a further improvement of this utility model, the small end of the conical helical spring is fixed to the connecting rod on the surface of the bushing by welding, threaded connection or interference fit.

[0012] As a further improvement of this utility model, the stirring impeller includes multiple pairs of conical helical springs arranged at axial intervals along the bushing.

[0013] This application also provides a reactor stirring system, including a reactor shell, a drive motor, a stirring shaft, and the aforementioned anti-settling radial flow stirring impeller. The stirring impeller is fixedly installed at the end of the stirring shaft by its bushing and is placed inside the reactor shell.

[0014] The technical advantages of this invention are as follows: The invention has a reasonable and ingenious structure, which allows it to actively adapt to the working conditions at the bottom of the tank, fundamentally preventing sediment formation and effectively breaking up existing sediment. Furthermore, the invention provides compound disturbance during operation, which effectively improves the stirring effect. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention.

[0016] Figure 2 This is a perspective view of the present invention. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0019] It should be noted that in the description of this utility model, the terms "radial", "axial", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Example 1 See Figure 1 and Figure 2 This embodiment provides an anti-settling radial flow stirring impeller, whose core components include a bushing 1, a connecting rod 2, and a conical helical spring 3.

[0021] The bushing 1 is a cylindrical component with a through hole in the center. A keyway (not shown in the figure) can be provided on the inner wall of the through hole for circumferential fixation by key connection with the stirring shaft (not shown in the figure), and axial fixation by means of shaft shoulder and lock nut, so as to install the entire impeller on the stirring shaft.

[0022] In this embodiment, a connecting rod 2 is fixed on each of the radially opposite outer surfaces of the bushing 1. The connecting rod 2 and the bushing 1 can be integrally formed by welding or connected by threads, which facilitates disassembly and replacement.

[0023] The conical helical springs 3 are in pairs, with their small ends fixed to the ends of the two connecting rods 2 by welding. This fixing method is firm and reliable, and can withstand the complex stress generated by the springs during stirring. It can be understood that the small ends of the conical helical springs 3 can also be installed on the bushing 1 or the connecting rod 2 by other equivalent mechanical fixing methods such as threaded connection or interference fit.

[0024] The key improvement of this utility model lies in the fact that the axial direction of the conical helical spring 3 is parallel to the radial direction of the bushing 1 (i.e., Figure 1 The conical helical spring 3 forms an acute angle in the horizontal direction. Preferably, this angle is between 15° and 75°. This specific angle causes the conical helical spring 3 to be in an inclined extended state in space, with its large end offset axially from the fixed position of the small end.

[0025] Working principle: When the stirring shaft drives the impeller to rotate, the inclined conical helical spring 3 interacts violently with the fluid. The fluid generates a continuous, high-frequency impact force on the spring coil, forcing the conical helical spring 3 to simultaneously produce high-frequency, low-amplitude elastic vibrations and micro-deformations in both the radial and axial directions. This unique motion mode produces the following synergistic effects: Radial dominant flow field: The rotation of the conical helical spring 3 generates a powerful radial jet that impacts the tank wall.

[0026] Axial secondary flow: Due to the inclined arrangement of the conical helical spring 3, it induces strong axial flow while disturbing the fluid, especially the flow stream towards the bottom of the tank, which can effectively impact and clean the bottom area of ​​the tank.

[0027] Microscopic efficient mixing: The high-frequency vibration of the conical helical spring 3 forms a large number of microscale eddies around it, generating an extremely high local shear rate, which is very effective in breaking particle agglomeration, preventing sedimentation and promoting mass transfer.

[0028] Adaptive slag removal: When the large end of the conical helical spring 3 sweeps across the sediment layer that has formed at the bottom of the tank, its flexible structure can bend and deform, penetrate into the lower part of the sediment layer, and "pry up" and break the sediment layer through vibration and rotational force. This process cannot be achieved by a rigid impeller.

[0029] In this embodiment, the conical helical spring 3 preferably has a constant pitch helical profile. This means that when the conical helical spring 3 is compressed, the large coils will tighten sequentially to the small coils. This design provides a progressive elastic response and gives the conical helical spring 3 better "digging" ability when in contact with sediment. Of course, depending on different process requirements (such as processing materials with different viscosities and particle characteristics), the conical helical spring 3 may also adopt a linearly varying or constant helical angle helical profile.

[0030] Example 2 This embodiment is a further optimization of Embodiment 1. To create a more uniform flow field in vertical mixing tanks, especially in equipment with a large height-to-diameter ratio, and to avoid axial mixing dead zones, this embodiment arranges multiple pairs of conical helical springs 3 at intervals along the axial direction of the bushing 1. For example, a pair of conical helical springs 3 can be added to the upper part of the bushing. The multi-layered arrangement of conical helical springs 3 can synchronously stir the fluid at different heights within the tank, forming a superimposed composite flow field, which greatly improves the overall mixing efficiency and anti-settling capability.

[0031] This utility model also provides a reactor stirring system, including a reactor shell, a drive motor, a stirring shaft, and the anti-settling radial flow stirring impeller described in any of the above embodiments. The stirring impeller is fixedly installed at the end of the stirring shaft by its bushing 1 and extends into the reactor shell, preferably located near the bottom of the tank, so as to maximize its anti-settling and sediment-breaking functions.

[0032] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A radial flow stirring impeller with anti-settling properties, characterized in that, include: A bushing (1) is used to fix and connect to the end of the stirring shaft; Connecting rods (2) are fixed to the radially opposite sides of the bushing (1); At least one pair of conical helical springs (3), the small end of which is fixed to the connecting rod (2).

2. The anti-settling radial flow stirring impeller as described in claim 1, characterized in that: The axial direction of the conical helical spring (3) forms an acute angle with the radial direction of the bushing (1), so that when the bushing (1) rotates with the stirring shaft, the conical helical spring (3) can generate a combined radial and axial disturbance in the fluid.

3. The anti-settling radial flow agitator impeller as described in claim 1, characterized in that: The spiral profile of the conical helical spring (3) is one of the following: linear variation type, equal pitch type, or equal helical angle type.

4. The anti-settling radial flow agitator impeller as described in claim 1, characterized in that: The small end of the conical helical spring (3) is fixed to the connecting rod (2) by welding, threaded connection or interference fit.

5. The anti-settling radial flow agitator impeller as described in claim 1, characterized in that: The stirring impeller includes multiple pairs of conical helical springs (3) arranged axially spaced along the bushing (1).

6. A stirring system for a reaction vessel, characterized in that, The reactor includes a reactor shell, a drive motor, a stirring shaft, and an anti-settling radial flow stirring impeller as described in any one of claims 1 to 5. The stirring impeller is fixedly installed at the end of the stirring shaft by its bushing (1) and placed inside the reactor shell.

Images