Stirring device

Abstract

The utility model discloses a stirring device. The stirring device comprises a bracket, the driving device is arranged on the bracket; the stirring part and the driving device are arranged on the two opposite sides of the support in the first direction; wherein the stirring part comprises a first impeller assembly, a second impeller assembly and a transmission assembly, and the first impeller assembly and the second impeller assembly are arranged in a spaced mode in the first direction; the first impeller assembly and the second impeller assembly are both in transmission connection with the transmission assembly, the first impeller assembly is in transmission connection with the driving device, the driving device is used for driving the first impeller assembly to rotate in the second direction, and the second impeller assembly synchronously rotates along with the first impeller assembly through the transmission assembly. The rotating direction of the first impeller assembly is opposite to that of the second impeller assembly, and the second direction surrounds the first direction. According to the stirring device, the water lifting amount of the stirring device can be increased, the service life of equipment is prolonged, and meanwhile, the requirements of energy conservation and emission reduction can be met.

Description

Technical Field

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

[0002] As my country's environmental protection and energy efficiency requirements continue to rise, water treatment mixing equipment is increasingly moving towards smaller footprints and higher treatment efficiency. Lift-type agitators have been widely adopted and proven effective in industries such as municipal administration, steel, power generation, and the chemical industry. Unlike traditional mixers, lift-type agitators are a core component of certain water treatment processes, and their mixing performance significantly impacts both treated water volume and effluent quality.

[0003] In order to improve the mixing efficiency, the existing lifting agitators are constantly developing towards larger sizes. However, the existing lifting agitators have the following problems: 1. As the impeller diameter increases, the shaft length becomes longer, and the agitator shaft and bearings are easily damaged; 2. Large-scale lifting agitators have high energy consumption and do not meet the requirements of energy conservation and emission reduction.

[0004] Therefore, there is an urgent need for a stirring device that can solve the above problems and meet the requirements of energy conservation and emission reduction to improve water treatment efficiency. Utility Model Content

[0005] The purpose of the utility model is to solve the technical problems of the existing lifting type agitator being easy to damage and having high energy consumption. The utility model provides a stirring device which can increase the lifting water volume of the stirring device, extend the service life of the device, and meet the requirements of energy conservation and emission reduction.

[0006] In order to solve the above technical problems, an embodiment of the present utility model discloses a stirring device, comprising: a bracket; a driving device, arranged on the bracket; a stirring part, along a first direction, the stirring part and the driving device are arranged on opposite sides of the bracket; wherein, the stirring part comprises a first impeller assembly, a second impeller assembly and a transmission assembly, and along the first direction, the first impeller assembly and the second impeller assembly are spaced apart; the first impeller assembly and the second impeller assembly are both transmission-connected to the transmission assembly, the first impeller assembly is transmission-connected to the driving device, the driving device is used to drive the first impeller assembly to rotate along the second direction, the second impeller assembly rotates synchronously with the first impeller assembly through the transmission assembly, and the rotation direction of the first impeller assembly is opposite to the rotation direction of the second impeller assembly, and the second direction surrounds the first direction.

[0007] By adopting the above technical solution, the embodiment of the present application forms a stirring section with a double-layer impeller structure through the first impeller assembly and the second impeller assembly, in which the lower impeller (for example, the first impeller assembly) is pre-lifted and the upper impeller (for example, the second impeller assembly) is lifted again. Compared with existing stirring devices, the lifting efficiency of the stirring device of the embodiment of the present application is increased, making it easier for the stirring device of the embodiment of the present application to meet the lifting capacity requirements. In addition, in the case of a deep application site (for example, a flocculation tank), the stirring section of the embodiment of the present application, which is lifted twice by the first impeller assembly and the second impeller assembly, is more conducive to offsetting the influence of gravity on the lifting capacity, further improving the lifting efficiency and reducing energy consumption.

[0008] In addition, in the embodiment of the present application, the second impeller assembly is connected to the first impeller assembly through a transmission assembly, and they rotate synchronously in opposite directions. The stirring part of the embodiment of the present application also has self-balancing ability, which can reduce the load on the first impeller assembly and the second impeller assembly of the stirring part during movement, thereby extending the service life of the stirring device.

[0009] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stirring device, wherein the first impeller assembly includes a first impeller and a first stirring shaft, and the second impeller assembly includes a second impeller and a second stirring shaft; wherein, the first impeller is arranged at an end of the first stirring shaft away from the driving device, and the second impeller is arranged at an end of the second stirring shaft away from the driving device, the first stirring shaft is respectively connected to the driving device and the transmission assembly, and the second stirring shaft is sleeved outside the first stirring shaft and is connected to the transmission assembly, so that the second impeller and the first impeller can move synchronously in opposite directions along the second direction.

[0010] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stirring device, wherein along the first direction, the projection coverage rate of the first impeller includes 25% to 40%, and the projection coverage rate of the second impeller includes 25% to 40%.

[0011] By adopting the above technical solution, the impellers (for example, the first impeller and the second impeller) of the embodiment of the present application have a large projection coverage rate, strong axial (i.e., first direction) lifting capacity, and a small power coefficient, which saves the consumption of stirring power and reduces the power consumption of the stirring device of the embodiment of the present application.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stirring device, wherein the structure of the first impeller is the same as that of the second impeller, and both include a plurality of blades; each of the blades is curved and streamlined.

[0013] By adopting the above technical solution, the curved streamlined design of the blades in the embodiment of the present application conforms to fluid mechanics. The curved shape reduces the shearing effect of the blades on the flocs. During the lifting process, the flocs continue to grow, enhancing the adsorption effect, thereby improving the sewage treatment effect of the stirring device in the embodiment of the present application.

[0014] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stirring device, the transmission assembly includes gear 1, gear 2, gear 3 and gear 4; the gear 1 is fixedly arranged at one end of the first stirring shaft close to the driving device, the gear 2 is fixedly arranged at one end of the second stirring shaft close to the driving device, the gear 1 and the gear 3 are meshed with each other, the gear 2 and the gear 4 are meshed with each other, and the gear 3 and the gear 4 are meshed with each other.

[0015] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stirring device, wherein the gear three and the gear four both include a rotating shaft, and the rotating shafts of the gear three and the gear four respectively extend along a first direction and are parallel to each other.

[0016] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stirring device, the transmission assembly also includes a shell, the gear one, the gear two, the gear three and the gear four are all arranged in the shell, and a lubricant is provided between the gear one, the gear two, the gear three and the gear four and the shell.

[0017] By adopting the above technical solution, the embodiment of the present application fills lubricant between gear one, gear two, gear three and gear four and the housing to improve the lubrication effect of the transmission assembly, thereby reducing the wear between the gears and extending the service life of the transmission assembly.

[0018] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stirring device, wherein the gear 1, the gear 2, the gear 3 and the gear 4 are all cylindrical gears.

[0019] By adopting the above technical solution, gear one, gear two, gear three and gear four in the embodiment of the present application all adopt cylindrical gears, which are simpler and more reliable and can extend the service life of the transmission component.

[0020] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stirring device, wherein the length of the first stirring shaft is L1, and the length of the second stirring shaft is L2; ​​wherein L1 / L2=4 / 3.

[0021] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stirring device, wherein the driving device includes a variable frequency motor and a reducer.

[0022] By adopting the above technical solution, the stirring device of the embodiment of the present application can further accurately adjust the rotation speed of the stirring shaft (for example, the first stirring shaft) through the variable frequency motor according to process requirements, thereby improving the processing effect.

[0023] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stirring device, wherein the output speed of the reducer ranges from 30 r / min to 60 r / min.

[0024] According to another specific embodiment of the present invention, the stirring device further includes a bearing, which is disposed in the bracket. Along the first direction, the first stirring shaft of the first impeller assembly passes through the bearing and is transmission-connected to the driving device.

[0025] According to another specific embodiment of the present invention, the embodiment of the present invention discloses a stirring device, which also includes a coupling, which is arranged in the bracket and respectively connects the driving device and the first stirring shaft of the first impeller assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A partial cross-sectional view of a stirring device according to an embodiment of the present invention is shown;

[0027] Figure 2 A cross-sectional view showing a bracket of a stirring device according to an embodiment of the present invention;

[0028] Figure 3 A perspective view showing a first impeller assembly and a second impeller assembly of a stirring device according to an embodiment of the present invention;

[0029] Figure 4 A perspective view showing a transmission assembly of a stirring device according to an embodiment of the present invention;

[0030] Figure 5 A front view showing a transmission assembly of a stirring device according to an embodiment of the present invention;

[0031] Figure 6 A top view of a stirring device according to an embodiment of the present invention is shown;

[0032] Figure 7 A schematic diagram of the force model of the stirring device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0036] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0037] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0039] refer to Figures 1 to 5 The present application provides a stirring device 1 . The stirring device 1 includes: a bracket 10 , a driving device 20 and a stirring portion 30 .

[0040] like Figure 1 As shown, along the first direction (as Figure 1 The bracket 10 is provided with a driving device 20 and a stirring portion 30 on opposite sides thereof (as shown in the X direction). The bracket 10 carries the driving device 20 and the stirring portion 30 and provides a transmission connection between the driving device 20 and the stirring portion 30. The stirring portion 30 includes a first impeller assembly 31, a second impeller assembly 32, and a transmission assembly 33.

[0041] Specifically, if Figure 2 As shown, the stirring device 1 of the embodiment of the present application further includes a coupling 40, and the bracket 10 has an inner cavity 101. The coupling 40 is disposed within the inner cavity 101. Along a first direction, the output end 201 of the drive device 20 extends into the inner cavity 101. The coupling 40 connects the output end 201 of the drive device 20 and the first impeller assembly 31 of the stirring portion 30 (e.g., the first stirring shaft 312 described below). For example, the drive device 20 of the embodiment of the present application is threadedly connected to the bracket 10.

[0042] For example, the bracket 10 of the embodiment of the present application further includes a bearing 50. Figure 2 As shown, along the first direction X, the bearing 50 is disposed within the inner cavity 101 and is threadedly connected to the inner wall of the bracket 10. The first stirring shaft 312 of the first impeller assembly 31, at the end closest to the drive device 20, passes through the bearing 50 and is transmission-connected to the output end 201 of the drive device 20 via the coupling 40. That is, the output end 201 of the drive device 20 and the first stirring shaft 312 are disposed on opposite sides of the coupling 40, facilitating installation and maintenance.

[0043] It can be understood that the transmission assembly 33 of the stirring device 1 of the embodiment of the present application (for example, the shell 335 described later) is installed on the top of the stirring container (not shown in the figure), that is, the stirring device 1 is a cantilever stirring device. Compared with the existing underwater bottom bearing or intermediate bearing type agitator, the underwater bearing is easily damaged and it is not convenient to repair the underwater bearing after damage. The bearing 50 of the stirring device 1 of the embodiment of the present application is located above the water surface, and the bearing 50 is not easily damaged and is easy to repair.

[0044] Continue to refer Figure 1 Combined with Figure 3 , along the first direction (such as Figure 1 The first impeller assembly 31 and the second impeller assembly 32 are spaced apart, and the second impeller assembly 32 is sleeved outside the first impeller assembly 31. The first impeller assembly 31 is connected to the driving device 20 in a transmission connection, and the first impeller assembly 31 and the second impeller assembly 32 are both connected to the transmission assembly 33 in a transmission connection, so that the driving device 20 can drive the first impeller assembly 31 to move in the second direction (as shown in the X direction). Figure 1The second impeller assembly 32 rotates synchronously with the first impeller assembly 31 through the transmission assembly 33, and the rotation direction of the first impeller assembly 31 (as shown in the R direction) is Figure 1 e direction) and the rotation direction of the second impeller assembly 32 (as shown in Figure 1 f in the figure).

[0045] Exemplarily, the driving device 20 of the embodiment of the present application includes a variable frequency motor and a speed reducer. Thus, the stirring device 1 of the embodiment of the present application can further accurately adjust the speed of the stirring shaft (for example, the first stirring shaft 312) by the variable frequency motor according to process needs, thereby improving the processing effect. The embodiment of the present application is not limited to the output speed of the speed reducer, and the output speed of the speed reducer can be any value between 30r / min and 60r / min, for example, 30r / min, 35r / min, 40r / min, 45r / min, 50r / min, 52r / min, 55r / min, 57r / min or 60r / min etc.

[0046] It is understood that the lift capacity of a stirring device is affected by the impeller diameter and the stirring shaft speed. The larger the impeller diameter and the higher the stirring shaft speed, the greater the lifting capacity of the stirring device. However, in actual applications, on the one hand, the impeller diameter of a stirring device is limited by the space occupied by the application site (for example, a flocculation tank); on the other hand, excessively high stirring shaft speeds can easily destroy the flocs, affecting the treatment effect. Therefore, it is difficult to increase the lifting capacity of a stirring device by increasing the impeller size and speed.

[0047] Based on this, the embodiment of the present application forms a stirring section 30 with a double-layer impeller structure by using the first impeller assembly 31 and the second impeller assembly 32, in which the lower impeller (for example, the first impeller assembly 31) is pre-lifted and the upper impeller (for example, the second impeller assembly 32) is lifted again. Compared with the existing stirring device, the lifting efficiency of the stirring device 1 of the embodiment of the present application is increased, making it easier for the stirring device 1 of the embodiment of the present application to meet the lifting capacity requirements. In addition, in the case of a deep application site (for example, a flocculation tank), the stirring section 30 of the embodiment of the present application is lifted twice by the first impeller assembly 31 and the second impeller assembly 32, which is more conducive to offsetting the influence of gravity on the lifting capacity, further improving the lifting efficiency.

[0048] In addition, in the embodiment of the present application, the second impeller assembly 32 is connected to the first impeller assembly 31 through the transmission assembly 33, and the impeller assembly 32 is connected to the first impeller assembly 31 in a transmission manner ... Figure 1The stirring device 1 of the present invention rotates in the directions e and f, thereby reducing the bending moment between the driving device 20 and the stirring portion 30. Specifically, the stirring device 1 of the present invention, through the mirror-image design of the first impeller assembly 31 and the second impeller assembly 32, enables the stirring portion 30 of the present invention to have a self-balancing capability, thereby reducing the load on the first impeller assembly 31 and the second impeller assembly 32 of the stirring portion 30 during movement, thereby extending the service life of the stirring device 1.

[0049] The following will be combined Figure 1 、 Figures 3 to 6 The structures and working principles of the first impeller assembly 31 and the second impeller assembly 32 provided in the embodiment of the present application are described in detail.

[0050] refer to Figure 3 and combined Figure 1 The first impeller assembly 31 of the embodiment of the present application includes a first impeller 311 and a first stirring shaft 312, and the second impeller assembly 32 includes a second impeller 321 and a second stirring shaft 322. The first stirring shaft 312 includes a first end 3121 and a second end 3122, and the second stirring shaft 322 includes a first end 3221 and a second end 3222.

[0051] Specifically, if Figure 1 and Figure 3 As shown, the first end portion 3121 of the first stirring shaft is in transmission connection with the driving device 20, the second stirring shaft 322 is sleeved on the outside of the first stirring shaft 312, and the first end portion 3221 of the second stirring shaft is in transmission connection with the transmission assembly 33, the first impeller 311 is fixedly provided at the second end portion 3122 of the first stirring shaft (i.e., the end of the first stirring shaft 312 away from the driving device 20), and the second impeller 321 is fixedly provided at the second end portion 3222 of the second stirring shaft (i.e., the end of the second stirring shaft 322 away from the driving device 20).

[0052] refer to Figure 4 and Figure 5 The transmission assembly 33 of the embodiment of the present application includes gear 1 331 , gear 2 332 , gear 3 33 , and gear 4 334 .

[0053] Specifically, if Figure 4 and Figure 5 As shown, the gear 1 331 is fixedly sleeved on the first end portion 3121 of the first stirring shaft (i.e., the end of the first stirring shaft 312 close to the driving device 20), and the gear 2 332 is fixedly sleeved on the first end portion 3221 of the second stirring shaft (i.e., the end of the second stirring shaft 322 close to the driving device 20). The tops of the gear 1 331 and the gear 3 333 are both on the first plane (as shown in FIG. Figure 5 The bottoms of the gear 2 332 and the gear 4 334 are both located in the second plane (as shown by the dashed line A) and mesh with each other. Figure 5In addition, the gear 333 and the gear 4 334 each include a rotation axis, the rotation axis 3331 of the gear 3 and the rotation axis 3341 of the gear 4 extend along the first direction X and are parallel to each other, and the gear 333 and the gear 4 334 extend along the first direction (as shown by the dashed line B) and mesh with each other, and the first plane A is parallel to the second plane B. Figure 4 and Figure 5 The first and second planes (shown in the X direction) extend between the first plane A and the second plane B and engage with each other.

[0054] That is, when the driving device 20 drives the first stirring shaft 312 of the first impeller assembly 31 to move in the second direction (eg Figure 4 and Figure 5 When the first stirring shaft 312 rotates (as shown in the R direction), first, gear 1 331 rotates synchronously with the first stirring shaft 312 in the second direction R. Secondly, because gear 1 331 is meshed with gear 3 333, and gear 3 333 is meshed with gear 4 334, gear 3 333 rotates with gear 1 331, and gear 4 334 rotates with gear 3 333, and the rotation direction of gear 4 334 is the same as that of gear 1 331. Finally, because gear 2 332 is meshed with gear 4 334, gear 2 332 rotates with gear 4 334, and the second stirring shaft 322 rotates with gear 2 332, and the rotation direction of gear 4 334 is opposite to that of gear 2 332. In other words, the rotation direction of the second stirring shaft 322 is opposite to that of the first stirring shaft 312.

[0055] Therefore, when the driving device 20 drives the first stirring shaft 312 to rotate along the second direction R, the second stirring shaft 322 follows the first stirring shaft 312 and rotates synchronously in the second direction R in the opposite direction through the transmission assembly 33 .

[0056] For example, gear one 331, gear two 332, gear three 333 and gear four 334 in the embodiment of the present application are all cylindrical gears, which are simpler and more reliable than gear sets such as planetary gear sets and worm gears commonly used in the prior art and can extend the service life of the transmission assembly 33.

[0057] For example, refer to Figure 1 and combined Figure 4 The transmission assembly 33 of the present embodiment further includes a housing 335, which is threadedly connected to the bracket 10. Gear 1 331, gear 2 332, gear 3 333, and gear 4 334 are all disposed within the housing 335. Lubricant (not shown) is filled between gears 1 331, gear 2 332, gear 3 333, gear 4 334, and the housing 335 to improve the lubrication effect of the transmission assembly 33 and extend the service life of the transmission assembly 33.

[0058] The embodiment of the present application does not limit the specific structure of the housing 335, as long as it can be used to accommodate gear one 331, gear two 332, gear three 333 and gear four 334. For example, the housing 335 can also be an oil tank structure filled with lubricating oil. Moreover, the embodiment of the present application does not limit the type of lubricant, as long as it can be used for lubrication between gear one 331, gear two 332, gear three 333 and gear four 334, for example, it can be lubricating oil or grease.

[0059] Thus, the driving device 20 drives the first stirring shaft 312 in the second direction R clockwise (eg Figure 1 When the first impeller 311 rotates in the second direction R in synchronization with the first stirring shaft 312, the second stirring shaft 322 can rotate in the second direction R in synchronization with the first stirring shaft 312 in a clockwise direction (as shown in the direction e in the figure). Since the second stirring shaft 322 is connected to the first stirring shaft 312 through the transmission assembly 33, the second stirring shaft 322 can rotate in the second direction R in synchronization with the first stirring shaft 312 in a counterclockwise direction (as shown in the direction e in the figure). Figure 1 f direction) rotates, the second impeller 321 can rotate counterclockwise along the second direction R synchronously with the second stirring shaft 322, so that the first impeller 311 and the second impeller 321 rotate in opposite directions (for example Figure 1 The synchronous mirror motion (as shown in directions e and f) both have a lifting effect in the first direction X.

[0060] refer to Figure 6 Combined with Figure 3 The structure of the first impeller 311 of the embodiment of the present application is the same as that of the second impeller 321, and both the first impeller 311 and the second impeller 321 include a plurality of blades 301. For the convenience of description, the following description will be made by taking the first impeller 311 as an example.

[0061] like Figure 6 As shown, the first impeller 311 includes a first impeller 312 along the second direction (eg Figure 6 Three blades 301 are arranged around the first stirring shaft (not shown in the figure) (as shown in the R direction). For example, each blade 301 is a curved streamlined shape. Figure 3 As shown, along the second direction R, one side edge 3011 of each blade 301 and the other side edge 3012 are aligned along the first direction (eg Figure 3 The outer edge 3013 of each blade 301 extends between the one side edge 3011 and the other side edge 3012 to form a streamlined concave surface 3014 of the blade 301, so that the fluid (such as sewage) can flow smoothly along the surface of the blade 301, reducing turbulence and separation, and lowering the resistance encountered by the sewage when passing through the blade 301.

[0062] Thus, the curved, streamlined design of blade 301 in the embodiment of the present application conforms to fluid mechanics and provides a large projected coverage ratio. It also provides strong lifting capacity in the axial direction (i.e., the first direction X) and low power consumption, saving stirring power. Furthermore, the curved shape reduces the shearing effect of blade 301 on the flocs, allowing the flocs to grow continuously during the lifting process, thereby enhancing the adsorption effect. Furthermore, the curved, streamlined blade 301 in the embodiment of the present application improves the sewage treatment effect.

[0063] The embodiment of the present application does not impose any specific restrictions on the specific shape and number of the blades 301, as long as they can meet the requirements for improving the efficiency of the stirring device 1. For example, the number of blades 301 of the first impeller 311 can also be two, four, five, or more, and each blade 301 can be in the shape of an S-shaped blade or a spiral blade.

[0064] Exemplarily, the projection coverage of the first impeller 311 in the embodiment of the present application is 25% to 40%. The projection coverage mentioned in the embodiment of the present application refers to the ratio of the projection area of ​​the blades 301 of the first impeller 311 (for example, the sum of the projection areas of the three blades 301 of the first impeller 311 in the horizontal plane along the first direction X) to the total area of ​​the impeller rotation plane (for example, the total area covered by the three blades 301 of the first impeller 311 during the rotation process). It can be understood that the higher the impeller projection coverage, the greater the lift of the impeller. Therefore, when the space of the application site (for example, a flocculation tank) is limited, the impeller projection coverage of the ordinary wide blade in the prior art is low, while the projection coverage of the first impeller 311 is high. Then, the lift of the first impeller 311 in the embodiment of the present application is much greater than the lift of the impeller of the ordinary wide blade.

[0065] Figure 7 A schematic diagram of a force model of the stirring device 1 according to an embodiment of the present application is shown.

[0066] As mentioned above, the stirring device 1 of the embodiment of the present application is a cantilever stirring device. When the lifting amount of the stirring device 1 is large, the dead weight and load of the impeller and the stirring shaft are large, the bending moment on the stirring shaft is large, and the strength requirements for the stirring shaft (or bearing 50) are high.

[0067] It can be understood that the bending moment of the stirring device 1 in the embodiment of the present application is an internal moment caused by the action of an external force, which can easily cause the stirring shaft of the stirring device 1 (for example, the first stirring shaft 312 or the second stirring shaft 322) to bend and deform and be damaged or the bearing 50 to break, thereby affecting the service life of the stirring device 1. The bending moment of the stirring device 1 in the embodiment of the present application is a bending moment M caused by a radial force acting on the stirring shaft (for example, the first stirring shaft 312 or the second stirring shaft 322). R .

[0068] The bending moment M acting on the stirring shaft caused by the radial forceR , we can know that:

[0069] M R =(∑F hi ·L i +9.81m w1 ·L e ·sin α +F e ·L e )×10 -3 (1)

[0070] Among them, F hi refers to the radial force of the fluid on the i-th impeller (including the radial force of the fluid on the first impeller 311 and the second impeller 321), L i refers to the length of the stirring shaft of the i-th impeller assembly (including the length of the first stirring shaft 312 and the second stirring shaft 322), m w1 It refers to the combined mass of the stirring shaft (including the first stirring shaft 312 and the second stirring shaft 322) and each impeller assembly (including the mass of the first impeller 311 and the second impeller 321), L e It refers to the distance between the combined center of gravity of the stirring shaft (including the first stirring shaft 312 and the second stirring shaft 322) and each impeller assembly (including the first impeller assembly 31 and the second impeller assembly 32) and the bearing, and α refers to the distance between the stirring shaft of each impeller assembly (including the first stirring shaft 312 and the second stirring shaft 322) and the vertical direction (i.e., the first direction, such as Figure 7 The angle (shown in the X direction) is F e It refers to the centrifugal force caused by the combined mass of the agitator shaft (including the first agitator shaft 312 and the second agitator shaft 322 ) and each impeller assembly.

[0071] According to the radial force F of the fluid on the i-th impeller hi , we can know that:

[0072]

[0073] Among them, K1 refers to the radial force coefficient of the fluid, which can be determined according to experimental results, M nqi It refers to the torque generated by the power of the i-th impeller (including the first impeller 311 and the second impeller 321), D Ji Refers to the diameter of the i-th impeller (including the diameter D of the first impeller 311 J1 and the diameter D of the second impeller 321 J2 ).

[0074] The torque M generated by the i-th impeller power nqi , we can know that:

[0075]

[0076] Among them, P qi It refers to the design power of the i-th impeller, and n refers to the rotational speed of the stirring shaft (ie, the rotational speed of the first stirring shaft 312).

[0077] The centrifugal force F caused by the combined mass of the agitator shaft and each impeller assembly e , we can know that:

[0078]

[0079] Wherein, the value of (n / nk) is 0.5, and [e] refers to the allowable eccentricity at the combined center of gravity of the stirring shaft (including the first stirring shaft 312 and the second stirring shaft 322) and each impeller assembly.

[0080] It can be understood that since the structure of the first impeller 311 of the stirring device 1 of the embodiment of the present application is the same as that of the second impeller 321, and the first impeller 311 and the second impeller 321 are synchronously moved in opposite directions (such as Figure 1 Thus, the bending moment acting on the first agitation shaft 312 in the embodiment of the present application is opposite to the bending moment acting on the second agitation shaft 322. Furthermore, the bending moment acting on the second agitation shaft 322 by the movement of the second impeller assembly 32 in the embodiment of the present application can balance the bending moment acting on the first agitation shaft 312 by the movement of the first impeller assembly 31.

[0081] In the following, the embodiment of the present application takes the length L1 of the first stirring shaft 312 = 4 m and the length L2 of the second stirring shaft 322 = 3 m as an example to illustrate the self-balancing ability of the stirring device 1 in the embodiment of the present application.

[0082] First, since the stirring device 1 of the embodiment of the present application is installed vertically, the stirring shaft of each impeller assembly is aligned with the vertical direction (i.e., the first direction, such as Figure 7 The angle α (shown in the X direction) is 0, the fluid radial force coefficient K1 is 1, and the allowable eccentricity [e] at the combined center of gravity of the stirring shaft and each impeller assembly is 9.55G / n.

[0083] For example, the combined mass of the first stirring shaft 312 and the first impeller 311 (ie, the mass of the first impeller assembly 31) is m w1 =420kg, the combined mass of the second stirring shaft 322 and the second impeller 321 (i.e. the mass of the second impeller assembly 32) m w1 =330kg, and the first stirring shaft 312 is connected to the driving device 20, and the second stirring shaft 322 is connected to the first stirring shaft 312 through the transmission assembly 33, that is, the rotational speed n of the stirring shaft in the embodiment of the present application is the rotational speed of the first stirring shaft 312, n=56r / min.

[0084] As mentioned above, the structure of the first impeller 311 of the embodiment of the present application is the same as that of the second impeller 321. Therefore, the design power P of the first impeller 311 of the embodiment of the present application is q1 The design power P of the second impeller 321 q2 Similarly, the diameter D of the first impeller 311 J1 The diameter D of the second impeller 321 J2 Same; then P q1 =P q2 =1.1kw, D J1 =D J2 =1.35m.

[0085] According to calculations, the bending moment MR1 caused by the radial force acting on the first stirring shaft 312 in the embodiment of the present application is 1310 N·m, and the bending moment MR2 caused by the radial force acting on the second stirring shaft 322 is 1131 N·m. That is, the percentage of the bending moment acting on the first stirring shaft 312 caused by the radial force that can be balanced by the second stirring shaft 322 in the embodiment of the present application is: MR1 / MR2*100%=86.3%.

[0086] Therefore, the stirring device 1 of the embodiment of the present application has self-balancing ability. The second stirring shaft 322 balances the bending moment acting on the first stirring shaft 312 caused by the radial force, which can avoid bending deformation and damage of the stirring shaft due to excessive internal torque, thereby extending the service life of the stirring device 1.

[0087] In summary, the stirring device 1 of the embodiment of the present application reduces the bending moment on the stirring shaft (e.g., the first stirring shaft 312 and the second stirring shaft 322) by adopting a self-balancing stirring structure formed by the first impeller assembly 31, the second impeller assembly 32, and the transmission assembly 33, thereby extending the service life of the stirring device 1. In addition, the double-lift structure formed by the first impeller 311 and the second impeller 321 increases the lifting capacity and lifting effect of the stirring device 1, improving the sewage treatment effect while reducing the power consumption of the stirring device 1, so that the stirring device 1 of the embodiment of the present application can meet the requirements of energy conservation and emission reduction.

[0088] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A stirring device, characterized in that: include: Bracket; A driving device, provided on the bracket; The stirring portion and the driving device are arranged on opposite sides of the bracket along the first direction; wherein, The stirring part includes a first impeller assembly, a second impeller assembly and a transmission assembly, and along the first direction, the first impeller assembly and the second impeller assembly are spaced apart; The first impeller assembly and the second impeller assembly are both in transmission connection with the transmission assembly. The first impeller assembly is in transmission connection with the driving device. The driving device is used to drive the first impeller assembly to rotate in a second direction. The second impeller assembly rotates synchronously with the first impeller assembly through the transmission assembly. The rotation direction of the first impeller assembly is opposite to the rotation direction of the second impeller assembly, and the second direction surrounds the first direction.

2. The stirring device according to claim 1, characterized in that The first impeller assembly includes a first impeller and a first stirring shaft, and the second impeller assembly includes a second impeller and a second stirring shaft; wherein, The first impeller is arranged at one end of the first stirring shaft away from the driving device, and the second impeller is arranged at one end of the second stirring shaft away from the driving device. The first stirring shaft is respectively connected to the driving device and the transmission assembly, and the second stirring shaft is sleeved outside the first stirring shaft and is connected to the transmission assembly, so that the second impeller and the first impeller can move synchronously in opposite directions along the second direction.

3. The stirring device according to claim 1 or 2, characterized in that Along the first direction, a projected coverage ratio of the first impeller is comprised between 25% and 40%, and a projected coverage ratio of the second impeller is comprised between 25% and 40%.

4. The stirring device according to claim 3, characterized in that The structure of the first impeller is the same as that of the second impeller, and both include a plurality of blades; Each of the blades is of a curved streamlined shape.

5. The stirring device according to claim 2, characterized in that The transmission assembly includes gear 1, gear 2, gear 3 and gear 4; The gear 1 is fixedly arranged at one end of the first stirring shaft close to the driving device, the gear 2 is fixedly arranged at one end of the second stirring shaft close to the driving device, the gear 1 is meshed with the gear 3, the gear 2 is meshed with the gear 4, and the gear 3 is meshed with the gear 4.

6. The stirring device according to claim 5, characterized in that The gear three and the gear four both include a rotation shaft, and the rotation shafts of the gear three and the gear four extend along the first direction and are parallel to each other.

7. The stirring device according to claim 5, characterized in that The transmission assembly also includes a housing, and the gear 1, the gear 2, the gear 3 and the gear 4 are all arranged in the housing, and lubricant is provided between the gear 1, the gear 2, the gear 3 and the gear 4 and the housing.

8. The stirring device according to claim 5, characterized in that The gear 1, the gear 2, the gear 3 and the gear 4 are all cylindrical gears.

9. The stirring device according to claim 2, wherein The length of the first stirring shaft is L1, and the length of the second stirring shaft is L2; ​​wherein L1 / L2=4 / 3.

10. The stirring device according to claim 1, wherein The driving device includes a variable frequency motor and a reducer.

11. The stirring device according to claim 10, characterized in that The output speed of the reducer ranges from 30 r / min to 60 r / min.

12. The stirring device according to claim 1, wherein The stirring device further includes a bearing, which is disposed in the bracket. Along the first direction, the first stirring shaft of the first impeller assembly passes through the bearing and is transmission-connected to the driving device.

13. The stirring device according to claim 1 or 12, characterized in that The stirring device further comprises a coupling, which is arranged in the bracket and is respectively connected to the driving device and the first stirring shaft of the first impeller assembly.

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