Energy-saving axial flow stirrer

Abstract

The utility model belongs to the technical field of chemical production, and particularly relates to an energy-saving axial flow stirrer, which comprises a rack shell, a stirring shaft, a stirring shaft, a stirring shaft and a stirring shaft, the connecting piece sleeves the bottom of the rotating shaft; the at least two paddles are arranged on the arc surface of the connecting piece at equal intervals in the circumferential direction; wherein the paddle is in a circular arc shape, the circular arc side of the paddle is obliquely downwards arranged, so that the front edge of the paddle is suitable for being cut into liquid at a small angle, and then the rear edge of the paddle is suitable for downwards feeding the liquid, the front edge of the paddle is cut into the liquid at a small angle, and the front edge of the paddle is obliquely downwards arranged at a small angle. After passing through the arc curved surface, the liquid generates strong downward liquid feeding quantity under the action of the rear edge, so that the purposes of reducing the resistance generated in the operation of the paddle, enhancing the turbulence degree of axial and radial turbulence, enabling the mixing effect to be better, not generating a vortex region when passing through the arc back surface and saving power are achieved; the stirring efficiency is ensured, and meanwhile, the efficient and energy-saving effects are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production, and particularly relates to an energy-saving axial flow stirrer. Background Art

[0002] A stirrer is a device that can be used for liquid-liquid or liquid-solid two-phase suspension mixing. Its type, size and rotation speed all affect the distribution of stirring power between overall flow and turbulent pulsation. Generally speaking, the power distribution of a turbine stirrer is beneficial to turbulent pulsation, while the axial flow stirrer is beneficial to overall flow. For the same type of stirrer, under the condition of the same power consumption, a stirrer with a large diameter and low rotation speed mainly consumes power in overall flow, which is beneficial to macroscopic mixing, and a stirrer with a small diameter and high rotation speed mainly consumes power in turbulent pulsation, which is beneficial to microscopic mixing.

[0003] The blades of a traditional axial flow stirrer generally adopt three groups of blades distributed on the circumferential side of the rotating shaft arc. The blades usually have a certain inclination angle relative to the rotating shaft, but during the rotation process, they are subject to greater resistance, with low efficiency and high energy consumption, which is not conducive to the long-term development of enterprises.

[0004] Therefore, in order to solve the above problems, it is necessary to design an energy-saving axial flow stirrer. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an energy-saving axial flow stirrer to solve the technical problem of high energy consumption of the existing axial flow stirrer.

[0006] To solve the above technical problems, the utility model provides an energy-saving axial flow stirrer, including:

[0007] A frame housing, with a rotating shaft connected by a bearing inside;

[0008] A connecting piece, sleeved at the bottom of the rotating shaft;

[0009] At least two blades, circumferentially and equidistantly arranged on the arc surface of the connecting piece; wherein

[0010] The blade is arc-shaped and the arc side is inclined downward, so as to be suitable for the front edge of the blade to cut into the liquid at a small angle and then the rear edge of the blade to send the liquid downward.

[0011] Further, the blade includes: an end and a root; wherein

[0012] The width from the end to the root increases linearly; and

[0013] From the root to the end, it is twisted counterclockwise along the central axis of the blade and the twisting angle is 5° - 7°.

[0014] Further, a bearing seat is provided inside the frame housing;

[0015] The bearing seat is sleeved on the rotating shaft.

[0016] Further, a coupling is connected to the top of the rotating shaft; among which

[0017] The other side of the coupling is adapted to be connected to a driving motor.

[0018] Further, the ratio of the diameter of the connecting piece to the rotation diameter of the blade is 1:10.44 to 1:6.96.

[0019] Further, the ratio of the root width to the length from the end to the root is 1:2.68 to 1:1.98;

[0020] The linear ratio of the end width to the root width is 1:2.4 to 1:1.94.

[0021] Further, each of the blades is made by cutting a hollow cylinder; among which

[0022] The ratio of the width of the root to the inner diameter of the hollow cylinder is 1:2.36 to 1:1.74.

[0023] Further, the angle between the center line connecting the two ends of the end and the horizontal line is 8° to 16°;

[0024] The angle between the center line connecting the two ends of the root and the horizontal line is 21° to 29°.

[0025] Further, an integrally formed enamel layer is attached to the surfaces of the rotating shaft, the blade and the connecting piece; among which

[0026] The base material of the blade is a single-piece steel plate.

[0027] The beneficial effects of the present utility model are:

[0028] (1). In the present utility model, since the blade is arc-shaped and the arc side is inclined downward, the front edge of the blade cuts into the liquid at a small angle, and the liquid passes through the arc surface and generates a strong downward liquid delivery volume under the action of the rear edge, so as to achieve sufficient pumping capacity of the fluid, and at the same time reduce the resistance generated during the operation of the blade, so as to achieve the effect of ensuring the stirring efficiency and realizing high-efficiency energy saving.

[0029] (2) In the present utility model, due to the high linear velocity at the end and the low linear velocity at the root, by linearly increasing the width from the end to the root, the resistance generated during the operation of the blade end is reduced. At the same time, by twisting counterclockwise along the central axis of the blade from the end to the root, when the fluid flows through the blade, no eddy current region is generated on the back of the blade, thereby achieving the purpose of energy saving. At the same time, a more uniform propulsion speed is generated within the length range of the blade, achieving an efficient pumping capacity.

[0030] (3) The present utility model achieves the best mixing and energy-saving effects by limiting the ratio of the diameter of the connecting piece to the rotating diameter of the blade, the linear ratio of the end width to the root width, the angle between the center line connecting the two ends of the end and the horizontal line, and the angle between the center line connecting the two ends of the root and the horizontal line.

[0031] Other features and advantages of the present utility model will be described in the following specification, and some of them will be obvious from the specification or understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification and the drawings.

[0032] To make the above objectives, features, and advantages of the present utility model more obvious and understandable, the following specifically provides preferred embodiments and, in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 is a perspective view of the preferred embodiment of the whole of the present utility model;

[0035] Figure 2 is a cross-sectional view of the preferred embodiment of the frame housing of the present utility model;

[0036] Figure 3 is a front view of the preferred embodiment of the blade end of the present utility model;

[0037] Figure 4 is a top view of the preferred embodiment of the blade of the present utility model;

[0038] Figure 5 is a cross-sectional view of the preferred embodiment of the blade root of the present utility model;

[0039] Figure 6This is the front view of the preferred embodiment of the blade root of the present utility model.

[0040] In the figure:

[0041] Frame housing 1, rotating shaft 2;

[0042] Blade 3, end 31, root 32;

[0043] Connecting piece 4, bearing seat 5, coupling 6;

[0044] Front edge A, rear edge B, central axis twist angle C, blade rotation diameter D, connecting piece diameter E, angle F between the center line of the two ends of the end and the horizontal line, angle G between the center line of the two ends of the root and the horizontal line, end width H1, root width H2, length H3 from the end to the root, inner diameter L of the hollow cylinder. Specific embodiments

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the scope of protection of the present utility model. Embodiment 1

[0046] As Figures 1 to 6 shown, this embodiment provides an energy-saving axial flow agitator, including:

[0047] Frame housing 1, which is internally connected to the rotating shaft 2 by bearings; connecting piece 4, sleeved at the bottom of the rotating shaft 2; at least two blades 3, which are circumferentially equidistantly arranged on the arc surface of the connecting piece 4; wherein the blade 3 is arc-shaped and the arc side is inclined downward, so as to be suitable for making the front edge of the blade 3 cut into the liquid at a small angle and then the rear edge of the blade 3 send the liquid downward; wherein it is most preferred that the connecting piece 4 and the rotating shaft 2 are movably connected to facilitate transportation and replacement; wherein the number of blades 3 is four but not limited to this.

[0048] In this embodiment, since the blade 3 is arc-shaped and the arc side is inclined downward, the front edge of the blade 3 cuts into the liquid at a small angle, and the liquid generates a strong downward liquid delivery volume under the action of the rear edge after passing through the arc surface, so as to achieve sufficient pumping capacity of the fluid, and at the same time reduce the resistance generated during the operation of the blade 3, so as to achieve the effect of high efficiency and energy saving while ensuring the stirring efficiency.

[0049] The blade 3 includes: a tip 31 and a root 32; wherein the width of the tip 31 linearly increases to the width of the root 32; and from the root 32 to the tip 31, it is twisted counterclockwise along the central axis of the blade 3 with a twist angle of 5° to 7°; and the most preferred twist angle is 6°.

[0050] In this embodiment, since the linear velocity of the tip 31 is high and the linear velocity of the root 32 is low, by linearly increasing the width from the tip 31 to the root 32, the resistance generated during the operation of the tip 31 of the blade 3 is reduced. At the same time, by twisting counterclockwise from the tip 31 to the root 32 along the central axis of the blade 3, when the fluid flows through the blade 3, no eddy current region is generated on the back of the blade 3, thereby achieving the purpose of energy saving. At the same time, a more uniform propulsion speed is generated within the length range of the blade 3, achieving an efficient pumping capacity.

[0051] In this embodiment, due to the special arc surface design of the blade 3, during stirring, the thrust of the blade 3 from the center to the edge on the lower side decreases, which is contrary to the traditional technology. At the same time, during stirring, the blade 3 makes the fluid in the middle reach the bottom of the container faster, bounce back, and radiate outward, so that the fluid is exchanged faster and is fully mixed faster.

[0052] A bearing seat 5 is provided inside the frame housing 1; the bearing seat 5 is sleeved on the rotating shaft 2; by providing the bearing seat 5, the jumping of the rotating shaft 2 is reduced when it rotates, so that the rotating shaft 2 runs smoothly.

[0053] A coupling 6 is connected to the top of the rotating shaft 2; on the other side of the coupling 6, it is adapted to be connected to a driving motor.

[0054] The ratio of the diameter of the connecting member 4 to the rotating diameter of the blade 3 is 1:10.44 to 1:6.96; the most preferred ratio of the diameter of the connecting member 4 to the rotating diameter of the blade 3 is 1:8.7.

[0055] The ratio of the width of the root 32 to the length from the tip 31 to the root 32 is 1:2.68 to 1:1.98; the linear ratio of the width of the tip 31 to the width of the root 32 is 1:2.4 to 1:1.94; the most preferred ratio of the width of the root 32 to the length from the tip 31 to the root 32 is 1:2.33; the most preferred linear ratio of the width of the tip 31 to the width of the root 32 is 1:2.17.

[0056] Each blade 3 is made by cutting a hollow cylinder; the ratio of the width of the root 32 to the inner diameter of the hollow cylinder is 1:2.36 to 1:1.74; the most preferred ratio of the width of the root 32 to the inner diameter of the hollow cylinder is 1:2.05.

[0057] In this embodiment, the basis for the selection of the blade 3 is as follows: according to the inner diameter of the reactor, determine the rotation diameter of the blade 3, then determine the length from the end 31 to the root 32 based on the rotation diameter of the blade 3, then determine the width of the root 32 based on the length from the end 31 to the root 32, and then determine the width of the end 31 and the arc of the blade 3 according to the width of the root 32, while leaving a certain margin for the enamel layer to adhere, so as to achieve the best stirring and energy-saving effects.

[0058] The angle between the center line connecting the two ends of the end 31 and the horizontal line is 8° - 16°; the angle between the center line connecting the two ends of the root 32 and the horizontal line is 21° - 29°; when the angle between the center line connecting the two ends of the end 31 and the horizontal line is selected as 8°, it is most preferable to select the angle between the center line connecting the two ends of the root 32 and the horizontal line as 21° to ensure the optimal pumping capacity.

[0059] In this embodiment, by limiting the ratio of the diameter of the connecting piece 4 to the rotation diameter of the blade 3, the linear ratio of the width of the end 31 to the width of the root 32, the angle between the center line connecting the two ends of the end 31 and the horizontal line, and the angle between the center line connecting the two ends of the root 32 and the horizontal line, the best stirring and energy-saving effects are achieved.

[0060] The surfaces of the rotating shaft 2, the blade 3, and the connecting piece 4 are all attached with an integrally formed enamel layer; the base material of the blade 3 is a single-piece steel plate; by setting the enamel layer and forming it integrally, the resistance is reduced while being resistant to strong acid and strong alkali working conditions to prevent corrosion; it is most preferable that the blade 3 uses a single steel plate; the traditional blade 3 is two clamped steel plates with a certain gap in the middle. For the convenience of the enamel process, each steel plate is only fired on one side and directly fired at a high temperature of 900°C for enamel, while the blade 3 in this embodiment uses a single steel plate and is fired with enamel on both sides; at the same time, stage temperature control and slow heating rate are adopted, for example, firing for a period of time at 300°C - 400°C, firing for a period of time at 400°C - 600°C, and firing for a period of time at 600°C - 900°C, so as to improve the integrity and durability of the blade 3 and the enamel layer.

[0061] In this embodiment, the enamel layer adopts a low-temperature slow-firing process. To eliminate the stress of the products of the stirring components of the present utility model in the enameling process, normalizing treatment is carried out after the arc of the blade 3 is pressed. After the blade 3 is welded to the connecting piece 4 and the rotating shaft 2, shot blasting treatment is carried out to make the surface rough so that the porcelain glaze can adhere better. Before enameling, a pre-firing step is added to reduce the total stress generated during the welding process, so as to greatly reduce the probability of porcelain chipping and be resistant to strong acids and strong alkalis.

[0062] In this embodiment, the data comparison between this stirrer and a conventional stirrer is as follows:

[0063] Comparison 1:

[0064] Comparison 2:

[0065] Disadvantages of the conventional agitator in the original working conditions in Comparison 1:

[0066] The stirring resistance is relatively large. The anchor-type stirrer is too close to the bottom of the kettle, and the material often accumulates and covers the bottom layer of the stirrer. The starting current is extremely large, resulting in serious motor loss, posing a safety hazard and increasing the replacement cost;

[0067] Disadvantages of the conventional agitator in the original working conditions in Comparison 2:

[0068] There are safety hazards (the belt will generate static electricity and heat), the stirring resistance is relatively large, and the current consumption is large;

[0069] In this embodiment, since the condition reflecting energy consumption is current, when the conventional agitator is idling without load, the current required for a 7.5kw motor to run idle is 7.5A. Due to the particularity of the blade 3 in this agitator, it can effectively reduce the resistance generated during the operation of the blade 3 and save work. When gradually testing the motor specifications from large to small, when the motor specification is 0.75kw, it is the minimum motor specification to meet the normal rotation and stirring of this agitator.

[0070] On the other hand, in this embodiment, the data comparison between the agitator with double-layer blades 3 and the conventional double-layer agitator is as follows:

[0071] Comparison 3:

[0072] Disadvantages of the conventional double-layer agitator in the original working conditions in Comparison 3:

[0073] The stirring resistance is relatively large, and the current consumption is large;

[0074] In summary, the advantages of this agitator are:

[0075] The stirring arc is optimized more reasonably;

[0076] The stirring torque is reduced, the service life is extended, and the safety is high;

[0077] The blade 3 generates an axial force, making the material stirring more uniform;

[0078] Effectively reduce the stirring resistance and save more electricity compared with the conventional agitator.

[0079] Each device (components without specific structures described) selected in this application is a general standard component or a component known to those skilled in the art, and its structure and principle can be known by those skilled in the art through technical manuals or by conventional experimental methods.

[0080] In the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0081] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0082] Taking the above ideal embodiments of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An energy-saving axial flow agitator, characterized in that: include: A frame housing (1) having an internal bearing connected to a rotating shaft (2); A connecting member (4) is sleeved on the bottom of the rotating shaft (2); At least two blades (3) are arranged equidistantly in the circumferential direction on the arc surface of the connecting member (4); wherein The blade (3) is in an arc shape and the arc side is arranged obliquely downward, so that the front edge of the blade (3) cuts into the liquid at a small angle and the rear edge of the blade (3) delivers the liquid downward.

2. The energy-saving axial flow agitator according to claim 1, characterized in that: The blade (3) comprises an end portion (31) and a root portion (32); wherein The width of the end portion (31) increases linearly to the width of the root portion (32); and The root portion (32) to the end portion (31) is twisted counterclockwise along the central axis of the blade (3) and the twisting angle is 5° to 7°.

3. The energy-saving axial flow agitator according to claim 1, characterized in that: A bearing seat (5) is provided inside the frame housing (1); The bearing seat (5) is sleeved on the rotating shaft (2).

4. The energy-saving axial flow agitator according to claim 1, characterized in that: The top of the rotating shaft (2) is connected to a coupling (6); wherein The other side of the coupling (6) is suitable for being connected to a driving motor.

5. The energy-saving axial flow agitator according to claim 1, characterized in that: The ratio of the diameter of the connecting member (4) to the rotation diameter of the blade (3) is 1:10.44 to 1:6.

96.

6. The energy-saving axial flow agitator according to claim 2, characterized in that: The ratio of the width of the root (32) to the length from the end (31) to the root (32) is 1:2.68 to 1:1.98; The linear ratio of the width of the end portion (31) to the width of the root portion (32) is 1:2.4 to 1:1.

94.

7. The energy-saving axial flow agitator according to claim 6, characterized in that: Each of the blades (3) is made by cutting a hollow cylinder; wherein The ratio of the width of the root (32) to the inner diameter of the hollow cylinder is 1:2.36 to 1:1.

74.

8. The energy-saving axial flow agitator according to claim 7, characterized in that: The angle between the center line of the two ends of the end portion (31) and the horizontal line is 8° to 16°; The angle between the center line of the two ends of the root (32) and the horizontal line is 21° to 29°.

9. The energy-saving axial flow agitator according to claim 1, characterized in that: The surfaces of the rotating shaft (2), the blades (3) and the connecting piece (4) are all attached with an integrally formed enamel layer; wherein The base material of the blade (3) is a single steel plate.

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