Stirring paddle and stirrer

Abstract

The utility model provides a stirring paddle and a stirrer, and relates to the technical field of stirrers, the stirring paddle provided by the embodiment of the utility model comprises a driving shaft and a venturi tube, the venturi tube is connected with the driving shaft, and the driving shaft is used for driving the venturi tube to rotate; the Venturi tube comprises an inlet and an outlet, and the area of the inlet is larger than that of the outlet; the outlet and the inlet are sequentially formed in the rotating direction of the driving shaft, so that after the stirring paddle rotates, liquid enters from the inlet and flows out from the outlet; an air inlet hole is formed in the side wall of the Venturi tube and is used for being connected with an air source.

Description

Technical Field

[0001] The utility model relates to the technical field of stirrers, in particular to a stirring paddle and a stirrer. Background Art

[0002] In the fields of biopharmaceuticals, chemical production, etc., aerobic fermentation and gas-liquid reaction processes are common production processes. These processes require efficient stirring and ventilation equipment to ensure reaction efficiency. As one of the core equipment, the performance of the agitator directly affects the gas-liquid mixing effect and the overall energy consumption level. Traditional gas-liquid reaction stirring systems usually adopt a combination of axial flow blades and radial flow blades. The axial flow blades are responsible for promoting the liquid to form an axial circulation flow to ensure macroscopic mixing within the reaction system; while the radial flow blades undertake the key tasks of gas distribution and bubble breakage, and disperse the introduced gas into fine bubbles through shearing action, thereby promoting mass transfer between the gas and liquid phases.

[0003] In current industrial practice, the design of agitators generally has the problem of insufficient bubble breaking ability of radial flow blades. Due to the unsatisfactory bubble breaking effect, the gas-liquid contact area is limited and the mass transfer efficiency is low. In order to achieve the expected reaction rate and production efficiency, operators are often forced to increase the stirring speed or increase the ventilation volume, which not only greatly increases the power consumption of the agitator, but also leads to an increase in the energy consumption of the compressed air system. Against the background of rising energy costs, this high-energy consumption stirring system has become an important factor restricting the improvement of corporate economic benefits. Especially in continuous, large-scale production equipment, stirring energy consumption accounts for a significant proportion of the total production cost, making the development of high-efficiency and low-consumption stirring technology a common problem that needs to be solved urgently in the industry. Utility Model Content

[0004] The purpose of the utility model is to provide a stirring paddle and a stirrer to alleviate the technical problem of limited gas-liquid contact area caused by unsatisfactory bubble breaking effect.

[0005] In a first aspect, an embodiment of the present invention provides a stirring impeller, comprising: a drive shaft and a venturi tube, wherein the venturi tube is connected to the drive shaft, and the drive shaft is used to drive the venturi tube to rotate;

[0006] The venturi tube includes an inlet and an outlet, the area of the inlet is larger than the area of the outlet; the outlet and the inlet are arranged in sequence along the rotation direction of the drive shaft, so that after the stirring paddle rotates, the liquid enters from the inlet and flows out from the outlet;

[0007] An air inlet is provided on the side wall of the venturi tube, and the air inlet is used to be connected to an air source.

[0008] Furthermore, there are multiple Venturi tubes, and the multiple Venturi tubes are arranged along the circumference of the drive shaft.

[0009] Furthermore, a gas collection hood is connected to the drive shaft, and the air inlet holes of the multiple Venturi tubes are connected to the gas collection hood. An opening is provided at the bottom of the gas collection hood, and the opening is for the air intake pipe to extend into, so that the gas emitted from the air intake pipe can be dispersed to each Venturi tube through the gas collection hood.

[0010] Furthermore, the stirring paddle also includes a gas distribution pipe, one end of which is connected to the air inlet, and the other end of which is connected to the gas collection cover.

[0011] Furthermore, the number of air inlet holes on the Venturi tube is n, where n is greater than or equal to 2, and the same Venturi tube is connected to the gas collection hood through n distribution pipes.

[0012] Furthermore, the stirring paddle also includes a connecting plate, which fixedly connects the venturi tube and the gas collection cover.

[0013] Furthermore, a line connecting the outlet and the inlet is arranged at an angle to a tangent line of the rotation direction of the drive shaft.

[0014] Furthermore, the gas collection hood is a gas container with a downward opening in a cylindrical, conical, elliptical or hemispherical shape.

[0015] Furthermore, the connection point between the gas distribution pipe and the gas collection cover is horizontal to the connection point between the gas distribution pipe and the air inlet;

[0016] Alternatively, the connection point between the gas distribution pipe and the gas collection cover is lower than the connection point between the gas distribution pipe and the gas inlet hole.

[0017] In a second aspect, the present invention provides an agitator comprising the above-mentioned agitator paddle.

[0018] The stirring paddle provided in an embodiment of the present invention includes: a drive shaft and a venturi tube, the venturi tube is connected to the drive shaft, and the drive shaft is used to drive the venturi tube to rotate; the venturi tube includes an inlet and an outlet, and the area of the inlet is larger than the area of the outlet; the outlet and the inlet are arranged in sequence along the rotation direction of the drive shaft, so that after the stirring paddle rotates, the liquid enters from the inlet and flows out from the outlet; an air inlet hole is opened on the side wall of the venturi tube, and the air inlet hole is used to connect to the air source.

[0019] The beneficial effects are as follows: when the stirring paddle rotates, the venturi tube rotates, and the liquid flows in through the side of the large-diameter inlet of the venturi tube and flows out through the small-diameter outlet. According to the Venturi effect generated by the Bernoulli principle, when the fluid flows through the narrow cross-section of the contraction section of the venturi tube, the flow velocity at the outlet will increase and the pressure will decrease, and a low-pressure area will be formed at the outlet. Therefore, air is sucked into the venturi from the air inlet, and the air converges inside the venturi tube and flows out through the outlet. With the changes in pressure and flow rate and the turbulence formed, the gas is broken into tiny bubbles and mixed with the liquid, so as to achieve the purpose of fully breaking the bubbles; and the overall stirring paddle generates radial flow while the gas and liquid are mixed, so that the bubbles are evenly distributed in the radial direction of the tank body, thereby increasing the gas-liquid contact area.

[0020] The stirrer provided by the present invention includes the above-mentioned stirring paddle. Since the stirrer provided by the embodiment of the present invention uses the above-mentioned stirring paddle, the stirrer provided by the embodiment of the present invention also has the advantages of the stirring paddle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of an agitator provided in an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a stirring paddle provided in an embodiment of the present utility model;

[0024] Figure 3 A top view of a stirring paddle provided in an embodiment of the present utility model;

[0025] Figure 4 A cross-sectional view of the Venturi tube of the stirring paddle provided in an embodiment of the present invention.

[0026] Icons: 1-drive shaft; 2-Venturi tube; 21-inlet; 22-outlet; 23-throat; 24-contraction section; 3-mounting disc; 5-air inlet; 6-gas collection hood; 61-opening; 7-inlet pipe; 8-gas distribution pipe; 9-connecting plate. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. 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.

[0028] like Figure 1-Figure 4 As shown, the stirring impeller provided in the embodiment of the present invention includes: a driving shaft 1, a mounting disc 3, a gas collecting cover 6, 2 to 8 venturi tubes 2, and 2 to 8 gas distribution pipes 8.

[0029] Mounting disc 3 is connected to drive shaft 1. Multiple Venturi tubes 2 are fixedly attached to the circumference of mounting disc 3. A gas collection hood 6 is connected below mounting disc 3. A gas distribution pipe 8 connects the Venturi tubes 2 and gas collection hood 6. Specifically, gas collection hood 6 is connected to the small-diameter throat 23 of the Venturi tubes 2 via gas distribution pipe 8.

[0030] The impeller includes a mounting disc 3, a venturi tube 2, a gas collection hood 6, a gas distribution pipe 8, a drive shaft 1 (which transmits power), and an air inlet pipe 7 (which connects to the air source outside the reactor). The venturi tube 2 is secured to the mounting disc 3 via a connecting plate 9, which strengthens the connection.

[0031] The gas collection hood 6 can be shaped like a downward-facing gas container, such as a cylinder, cone, ellipse, or hemispherical container. An opening 61 is provided at the bottom of the gas collection hood 6, into which the outlet of the externally connected air intake pipe 7 extends. The gas collection hood 6 serves as a gas transition and diversion mechanism. The air intake holes 5 of the multiple venturi tubes 2 are connected to the gas collection hood 6 via a gas distribution pipe 8. Gas flowing upward from the air intake pipe 7 into the opening 61 then enters each venturi tube 2.

[0032] The venturi tube 2 may be connected to the gas collection hood 6 via one gas distribution pipe 8 or via multiple gas distribution pipes 8 .

[0033] The line connecting the outlet 22 and the inlet 21 is arranged at an angle with a tangent to the rotational direction of the drive shaft 1, and the angle can range from 0° to 35°. The gas-liquid mixture flowing out of the outlet 22 of the previous venturi tube 2 does not flow directly into the inlet 21 of the next venturi tube 2, thereby achieving full fusion of the gas and liquid.

[0034] The connection point between the gas distribution pipe 8 and the gas collection cover 6 is horizontal to the connection point between the gas distribution pipe 8 and the gas inlet 5. Alternatively, the connection point between the gas distribution pipe 8 and the gas collection cover 6 is lower than the connection point between the gas distribution pipe 8 and the gas inlet 5.

[0035] Preferably, when the connection point between the gas distribution pipe 8 and the gas collection hood 6 is lower than the connection point between the gas distribution pipe 8 and the air inlet 5, after entering the gas collection hood 6, the air rises along the inclined gas distribution pipe 8 into the venturi tube 2. Since the gas itself has buoyancy in the liquid, it can enter the venturi tube 2 more smoothly. Because air is mainly drawn into the venturi tube 2 at low pressure, the optimal choice is to be horizontal or lower. However, in other feasible solutions, the connection point between the gas distribution pipe 8 and the gas collection hood 6 can also be higher than the connection point between the gas distribution pipe 8 and the air inlet 5.

[0036] In summary, after the air intake pipe 7 enters the tank, it rises to the gas collection hood 6. When the motor drives the drive shaft 1 to rotate clockwise, the drive shaft 1 drives the venturi tube 2 to rotate through the mounting disc 3. The liquid flows in through the side of the large-diameter inlet 21 of the venturi tube 2 and flows out at the small-diameter throat 23. According to the Venturi effect generated by the Bernoulli principle, when the fluid flows through the narrow cross-section of the contraction section 24 of the venturi tube 2, the flow rate at the throat 23 increases and the pressure decreases, forming a low-pressure area at the throat 23. Therefore, air is sucked from the gas collection hood 6 through the gas distribution pipe 8 into the air inlet 5 of the venturi tube 2. The air converges inside the venturi tube 2 and flows out through the throat 23. With the changes in pressure and flow rate and the turbulence formed, the gas is broken into tiny bubbles that mix with the liquid. By calculating and adjusting the angle of the venturi tube 2, the overall stirring paddle generates radial flow while the gas and liquid are mixed, so that the bubbles are evenly distributed in the radial direction of the tank body.

[0037] The stirrer provided by the present invention includes the above-mentioned stirring paddle. Since the stirrer provided by the embodiment of the present invention uses the above-mentioned stirring paddle, the stirrer provided by the embodiment of the present invention also has the advantages of the stirring paddle.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stirring paddle, characterized in that: include: A drive shaft (1) and a venturi tube (2), wherein the venturi tube (2) is connected to the drive shaft (1), and the drive shaft (1) is used to drive the venturi tube (2) to rotate; The venturi tube (2) comprises an inlet (21) and an outlet (22), wherein the area of the inlet (21) is larger than the area of the outlet (22); the outlet (22) and the inlet (21) are arranged in sequence along the rotation direction of the drive shaft (1), so that after the stirring paddle rotates, the liquid enters from the inlet (21) and flows out from the outlet (22); An air inlet (5) is provided on the side wall of the venturi tube (2), and the air inlet (5) is used to be connected to an air source.

2. The stirring paddle according to claim 1, characterized in that There are multiple Venturi tubes (2), and the multiple Venturi tubes (2) are arranged along the circumference of the drive shaft (1).

3. The stirring paddle according to claim 2, characterized in that: A gas collecting hood (6) is connected to the driving shaft (1), and the air inlet holes (5) of the plurality of venturi tubes (2) are all in communication with the gas collecting hood (6). An opening (61) is provided at the bottom of the gas collecting hood (6), and the opening (61) is for the air inlet pipe (7) to extend into, so that the gas emitted from the air inlet pipe (7) is dispersed to each venturi tube (2) through the gas collecting hood (6).

4. The stirring paddle according to claim 3, characterized in that: The stirring paddle further comprises a gas distribution pipe (8), one end of the gas distribution pipe (8) is connected to the gas inlet hole (5), and the other end is communicated with the gas collection cover (6).

5. The stirring paddle according to claim 4, characterized in that: The number of the air inlet holes (5) on the Venturi tube (2) is n, where n is greater than or equal to 2, and the same Venturi tube (2) is connected to the gas collection hood (6) through n distribution pipes.

6. The stirring paddle according to claim 3, characterized in that: The stirring paddle further comprises a connecting plate (9), wherein the connecting plate (9) fixedly connects the venturi tube (2) and the gas collection hood (6).

7. The stirring paddle according to claim 1, characterized in that: The connecting line of the outlet (22) and the inlet (21) is arranged at an angle to the tangent line of the rotation direction of the drive shaft (1).

8. The stirring paddle according to claim 3, characterized in that: The gas collection hood (6) is cylindrical, conical, elliptical or hemispherical.

9. The stirring paddle according to claim 4, characterized in that: The connection point between the gas distribution pipe (8) and the gas collection cover (6) is horizontal to the connection point between the gas distribution pipe (8) and the gas inlet hole (5); Alternatively, the connection point between the gas distribution pipe (8) and the gas collection cover (6) is lower than the connection point between the gas distribution pipe (8) and the air inlet (5).

10. A stirrer, characterized in that: The stirring paddle comprises the stirring paddle according to any one of claims 1 to 9.

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