A stirring blade and a stirring device

Abstract

The present application provides a stirring blade and a stirring device, wherein the stirring blade comprises: a stirring blade rod connected to the end of the blade; the end of the blade comprises: a concave portion with a non-smooth surface, located on a first side of the end of the blade; and a convex portion with a chamfer, located on a second side of the end of the blade. According to the stirring blade and the stirring device of the present application, a bionic design is adopted, and a concave portion with a non-smooth surface and a convex portion with a specific chamfer are arranged at the end of the stirring blade, so as to achieve viscosity reduction and resistance reduction, and effectively reduce the risk of breaking the stirring shaft.

Description

Technical Field

[0001] The present application relates to the field of environmental protection technology, and more specifically to stirring. Background Art

[0002] Dry anaerobic fermentation has the characteristics of strong tolerance to impurities, high volumetric load, high volumetric gas production rate, and low energy consumption, but it also has the disadvantages of long reaction cycle and easy acid inhibition and ammonia nitrogen inhibition. At present, most of the dry anaerobic reactors used in industry are horizontal reactors, and the mixing of materials is the key to the stable operation of the reactor. At present, the reactor generally adopts a horizontal stirring device to achieve material mixing. The stirring device consists of a stirring shaft and a single-blade paddle with equal spacing and spiral distribution. The single-blade paddle consists of a paddle rod and a groove at the end of the paddle. During the stirring process, the end groove can scoop up the heavy medium (such as sand, glass, etc.) deposited in the material and evenly disperse it in the reactor to avoid the problem of excessive sand deposition at the bottom of the reactor causing the effective volume of the reactor to be reduced. However, during operation, the dry anaerobic fermentation material has a high solid content and high viscosity, and the end groove of the paddle is easy to adhere to the material, especially the bottom sand. With the increase of the amount of material adhesion in the end groove, the stirring and mixing effect of the groove structure on the material will be greatly reduced, thereby reducing the stability of the reactor operation. Summary of the invention

[0003] The present application is proposed in view of the above problems. The present application provides a stirring blade and a stirring device to solve at least one of the above problems.

[0004] According to a first aspect of the present application, there is provided a stirring blade, comprising:

[0005] A stirring paddle rod connected to the end of the paddle;

[0006] The blade end comprises:

[0007] a recess having a non-smooth surface located on a first side of the blade end;

[0008] A chamfered protrusion is located on the second side of the blade end.

[0009] Optionally, the cross-sectional curve of the concave portion comprises a bionic curve.

[0010] Optionally, the non-smooth surface of the recess includes one or more continuous or discontinuous protrusions or grooves.

[0011] Optionally, the protrusions or recesses include raised ridges, grooves, ribs, scales, bumps or pits.

[0012] Optionally, the chamfer angle of the protrusion is within a range of 45°-145°.

[0013] Optionally, the ratio of the length to the width of the blade end is greater than or equal to 1 and less than or equal to 4.

[0014] Optionally, the cross-section of the blade end comprises a polygon.

[0015] Optionally, the protrusion is perpendicular to the cross section of the blade end.

[0016] Optionally, the stirring paddle rod is made of square steel, rectangular steel, I-beam, or round steel.

[0017] According to a second aspect of the present application, a stirring device is provided, comprising: the stirring blade according to the first aspect, comprising a stirring blade rod and a blade end;

[0018] A stirring shaft is connected to the stirring paddle rod, and the stirring shaft is used to drive the stirring paddle to rotate.

[0019] According to the stirring blade and stirring device of the embodiment of the present application, a bionic design is adopted, and a recess with a non-smooth surface and a protrusion with a specific chamfer are provided at the end of the stirring blade, which can effectively reduce the risk of breaking the stirring shaft while achieving viscosity reduction and resistance reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0021] Figure 1 is a schematic diagram of the structure of a stirring blade according to an embodiment of the present application;

[0022] Figure 2 is an example of a cross-sectional curve of a concave portion according to an embodiment of the present application;

[0023] Figure 3 is an example of a non-smooth surface of a concave portion according to an embodiment of the application;

[0024] Figure 4 is another example of a non-smooth surface of a concave portion according to an embodiment of the application;

[0025] Figure 5 is an example of the dimensions of the blade end according to an embodiment of the present application;

[0026] Figure 6 It is a schematic structural diagram of a stirring device according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0028] The uniform mixing of materials is the key to efficient dry anaerobic fermentation. In the current related technologies, a single-blade paddle with a groove at the end can be used to prevent the deposition of heavy medium at the bottom of the reactor. However, during the operation of the single-blade paddle, the groove at the end of the paddle is prone to adhere to materials, especially bottom sand, thereby reducing the stability of the reactor operation. For the symmetrically distributed groove form at the end of the paddle, the bottom surface of the paddle groove is designed as an inclined surface, a folded surface or a curved surface to reduce the radial inward emptying resistance of the material in the groove to facilitate the removal of the material. However, during operation, especially during the process of stopping stirring for a period of time and restarting, it also has obvious disadvantages: on the one hand, the groove structure with an inclined surface or a folded surface at the bottom still has dead corners, and material adhesion cannot be avoided, and the adhesion will gradually increase with the increase of the running time. Although the groove with a curved surface at the bottom has no dead corners, during the process of stopping and restarting the stirring paddle, adhesion occurs during the contact between the groove and the heavy medium due to excessive resistance. On the other hand, the two grooves at the end of the paddle are symmetrical structures. When the stirring paddle rotates forward and reversely, the contact area between the groove and the heavy medium is relatively large, and a large instantaneous torque will appear, which cannot avoid the risk of blade breakage.

[0029] Based on the above considerations, a stirring blade is provided according to an embodiment of the present application. Figure 1 , Figure 1 FIG. 2 shows a schematic diagram of the structure of the stirring blade according to an embodiment of the present application. Figure 1 As shown, the stirring blade 100 includes:

[0030] A stirring paddle rod 110 connected to a paddle end 120;

[0031] The blade end 120 includes:

[0032] a recessed portion 121 having a rough surface, located on a first side of the blade end 120;

[0033] The chamfered protrusion 122 is located on the second side of the blade end 120 .

[0034] The blade end has a groove on one side and a chamfer or sharp corner on the other side, which allows the stirring blade to reverse first during the shutdown and restart process. At this time, the sharp corner on the back of the groove is less resisted by the deposited heavy medium, and the instantaneous torque is small, which can effectively reduce the risk of the stirring shaft breaking. It can be widely used in any occasions that require stirring.

[0035] Alternatively, the stirring paddle bar 110 may include a column having a polygonal, circular, or elliptical cross section. In some embodiments, the stirring paddle bar 110 may be a cylinder.

[0036] In some embodiments, the stirring paddle shaft 110 may be made of square steel, rectangular steel, I-beam, or round steel.

[0037] Optionally, the cross-sectional curve of the recess 121 may include a bionic curve. For example, the bionic curve may be designed according to the bending curve of the claws of digging animals, so that the recess 121 designed based on the bionic curve can reduce viscosity and resistance during stirring, thereby improving stirring efficiency.

[0038] In some embodiments, see Figure 2 , Figure 2 FIG. 2 shows an example of a cross-sectional curve of a concave portion according to an embodiment of the present application. Figure 2 As shown, the bionic curve may include a curve composed of multiple line segments.

[0039] Optionally, the non-smooth surface of the recess 121 may include one or more protrusions or grooves. The presence of the non-smooth surface produces a "rolling effect" and a "guiding effect" on the material in contact with the blade end 120, further reducing viscosity and resistance during the stirring process and improving stirring efficiency.

[0040] In some embodiments, the protrusions or grooves may include protruding ridges, grooves, ribs, scales, humps or pits. In some embodiments, the protrusions may be continuous or discontinuous.

[0041] In some embodiments, Figure 1 As shown, the non-smooth surface of the recess 121 includes a plurality of continuous ribs 123 .

[0042] In some embodiments, see Figure 3 , Figure 3 An example of a rough surface of a concave portion according to an embodiment of the application is shown, and the rough surface of the concave portion 121 includes a plurality of discontinuous convex hull forms. Further, the plurality of discontinuous convex hulls may be evenly distributed or unevenly distributed, or symmetrically distributed or asymmetrically distributed, without limitation here. It should be understood that the number, size and position of the convex hulls may be set as required, without limitation here.

[0043] In some embodiments, see Figure 4 , Figure 4 Still another example of the non-smooth surface of the recessed portion according to the embodiment of the application is shown, and the non-smooth surface of the recessed portion 121 includes discontinuous ridges.

[0044] According to the embodiment of the application, the recess 121 adopts the bionic design principle, and is a bionic curved surface composed of multiple line segments when viewed from the cross-section, and a certain number of protrusions are arranged on the surface of the recess 121 to ensure that the surface of the recess 121 is a non-smooth surface, thereby reducing the adhesion of materials, especially heavy media, inside the recess 121, and further improving the stirring efficiency and effect.

[0045] Optionally, the chamfer angle of the protrusion 122 includes 45°-145°. In some embodiments, the chamfer angle of the protrusion 122 includes 0°-120°. The chamfer has less resistance to the deposited heavy medium and less instantaneous torque, which can effectively reduce the risk of breaking the stirring shaft.

[0046] Alternatively, if Figure 1 As shown, the cross section 124 of the blade end 120 can be a polygon such as a rectangle, a square, a trapezoid, a triangle, etc. In some embodiments, the plane where the recess 121 is located is perpendicular to the cross section. In some embodiments, the protrusion 122 includes a first plane and a second plane, and the first plane and the second plane form the chamfer, wherein the first plane and the second plane are perpendicular to the cross section of the blade end 120. In some embodiments, the protrusion 122 is perpendicular to the cross section of the blade end.

[0047] In some embodiments, see Figure 5 , Figure 5 2 shows an example of the dimensions of the blade end according to an embodiment of the present application. Figure 5 As shown, the ratio of the length L1 to the width L2 of the blade end 120 is in the range of [1, 4], that is, greater than or equal to 1 and less than or equal to 4.

[0048] In some embodiments, the ratio of the width L3 of the protrusion 122 to the width L2 of the blade end 120 is in the range of [1 / 3, 2 / 3], greater than or equal to 1 / 3, and less than or equal to 2 / 3.

[0049] Optionally, the blade end 120 may further include: at least one end side surface 125 .

[0050] According to another aspect of the present application, a stirring device is provided. Figure 6 , Figure 6 Schematic diagram of the structure of the stirring device according to an embodiment of the present application is shown. Figure 6 As shown, the stirring device 600 includes:

[0051] A stirring blade 610, comprising a stirring blade rod 611 and a blade end 612;

[0052] The stirring shaft 620 is connected to the stirring paddle rod 611 , and the stirring shaft 620 is used to drive the stirring paddle 610 to rotate.

[0053] Optionally, the stirring device 600 further includes:

[0054] A control device (not shown) is connected to the stirring shaft 620 and is used to control the rotation direction of the stirring shaft 620 .

[0055] In some embodiments, the control device may be implemented by software, hardware, firmware or a combination thereof. In some embodiments, the control device may use at least one of a circuit, a single or multiple application-specific integrated circuits (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a PLC, a microcontroller, and a microprocessor.

[0056] In some embodiments, see Figure 6 The control device can control the stirring shaft 620 to start rotating clockwise (reverse), counterclockwise (forward) or stop rotating.

[0057] Among them, Figure 6 As shown, the stirring shaft 620 can rotate forward and reverse around the axis, and the stirring paddle rod 611 is connected to the stirring shaft 620 and rotates with the stirring shaft 620. When the stirring shaft 620 rotates forward, the blade end 612 contacts the sand at the bottom of the reactor, scoops up the sand at the bottom, and avoids excessive sand deposition of the material. When the blade of the stirring device stops for a period of time due to special reasons, a hard sand layer may be formed at the bottom of the reactor. At this time, the stirring shaft 620 can be reversed, and the raised portion of the blade end 612 has a sharp corner, which contacts the sand layer at the bottom of the reactor to play a role in breaking it, while preventing the blade end 612 or the stirring shaft 620 from breaking due to excessive instantaneous torque.

[0058] According to the stirring blade and stirring device of the embodiment of the present application, a bionic design is adopted, and a recess with a non-smooth surface and a protrusion with a specific chamfer are provided at the end of the stirring blade, which can effectively reduce the risk of breaking the stirring shaft while achieving viscosity reduction and resistance reduction.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A stirring blade, characterized in that: The stirring blade comprises: A stirring paddle rod connected to the end of the paddle; The blade end comprises: a recess having a non-smooth surface located on a first side of the blade end; A chamfered protrusion is located on the second side of the blade end.

2. The stirring blade according to claim 1, characterized in that: The cross-sectional curve of the concave portion includes a bionic curve.

3. The stirring blade according to claim 1, characterized in that: The non-smooth surface of the recess includes one or more continuous or discontinuous protrusions or grooves.

4. The stirring blade according to claim 3, characterized in that: The protrusions or recesses include protruding ridges, grooves, ribs, scales, bumps or pits.

5. The stirring blade according to claim 1, characterized in that: The chamfer angle of the protrusion is within a range of 45°-145°.

6. The stirring blade according to claim 1, characterized in that: The ratio of the length to the width of the blade end is greater than or equal to 1 and less than or equal to 4.

7. The stirring blade according to claim 1, characterized in that: The cross-section of the blade end comprises a polygon.

8. The stirring blade according to claim 7, characterized in that: The protrusion is perpendicular to a cross section of the blade end.

9. The stirring blade according to claim 1, characterized in that: The stirring paddle rod is made of square steel, rectangular steel, I-beam, or round steel.

10. A stirring device, characterized in that: The stirring device includes: The stirring blade according to any one of claims 1 to 9, comprising a stirring blade rod and a blade end; A stirring shaft is connected to the stirring paddle rod, and the stirring shaft is used to drive the stirring paddle to rotate.

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