Stirring device

Abstract

The invention 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 invention relates to the technical field of stirrers, and in particular to a stirring device. Background Art

[0002] As my country's environmental protection and energy consumption requirements continue to increase, water treatment mixing equipment continues to develop in the direction of small footprint and high treatment efficiency. Lifting agitators have been widely promoted and applied in municipal, steel, electric power, chemical and other industries, and have achieved good results. Unlike traditional mixing agitators, lifting agitators are one of the core devices of some water treatment processes, and their mixing effect greatly affects the amount of treated water and the quality of effluent water.

[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. 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. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems of the existing lifting type agitator being vulnerable and having high energy consumption. The present invention 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 saving and emission reduction.

[0006] To solve the above technical problems, an embodiment of the present invention 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 arranged at intervals; 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 part 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 first, and the upper impeller (for example, the second impeller assembly) is lifted again. Compared with the existing stirring device, 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 amount requirements. In addition, in the case of a high depth of the application site (for example, a flocculation tank), the stirring part of the embodiment of the present application is lifted twice by the first impeller assembly and the second impeller assembly, which is more conducive to offsetting the influence of gravity on the lifting amount, 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 has a 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, an 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 disposed at an end of the first stirring shaft away from the driving device, and the second impeller is disposed at an end of the second stirring shaft away from the driving device, and 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 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 of the first impeller includes 25% to 40%, and the projection coverage of the second impeller includes 25% to 40%.

[0011] By adopting the above technical scheme, the impellers of the embodiment of the present application (for example, the first impeller and the second impeller) have a large projection coverage rate, a strong axial (i.e., the 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 impellers include a plurality of blades; each of the blades is a curved streamlined shape.

[0013] By adopting the above technical scheme, the curved streamlined design of the blades in the embodiment of the present application conforms to fluid mechanics, and the curved surface 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, an embodiment of the present invention discloses a stirring device, the transmission assembly includes gear one, gear two, gear three and gear four; the gear one is fixedly arranged at one end of the first stirring shaft close to the driving device, the gear two is fixedly arranged at one end of the second stirring shaft close to the driving device, the gear one is meshed with the gear three, the gear two is meshed with the gear four, and the gear three is meshed with the gear four.

[0015] According to another specific embodiment of the present invention, an 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 extend respectively along a first direction and are parallel to each other.

[0016] According to another specific embodiment of the present invention, an 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 component, thereby reducing the wear between the gears and extending the service life of the transmission component.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a stirring device, wherein the gear one, the gear two, the gear three and the gear four 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 comprises a bearing, wherein the bearing is disposed in the bracket, and 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, an embodiment of the present invention discloses a stirring device, which also includes a coupling, and the coupling is arranged in the bracket, and the coupling is respectively connected to 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 support 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 three-dimensional diagram 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 a force model of a stirring device according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The following specific embodiments illustrate the implementation of the present invention, and 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 invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include 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 the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[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 and explained in the 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 inventive product is usually placed when used. They are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the present invention.

[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 is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0038] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in 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 part 30 .

[0040] like Figure 1 As shown, along the first direction (such as Figure 1 The support 10 is provided with a driving device 20 and a stirring part 30 on opposite sides thereof, and the support 10 carries the driving device 20 and the stirring part 30, and the driving device 20 is connected to the stirring part 30 by transmission. The stirring part 30 includes a first impeller assembly 31, a second impeller assembly 32 and a transmission assembly 33.

[0041] Specifically, 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 arranged in the inner cavity 101, and along the first direction, the output end 201 of the driving device 20 extends into the inner cavity 101, and the coupling 40 connects the output end 201 of the driving device 20 and the first impeller assembly 31 (for example, the first stirring shaft 312 described later) of the stirring part 30. Exemplarily, the driving device 20 of the embodiment of the present application is threadedly connected to the bracket 10.

[0042] Exemplarily, 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 in 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, one end of which is close to the driving device 20, passes through the bearing 50 and is transmission-connected to the output end 201 of the driving device 20 through the coupling 40, that is, the output end 201 of the driving device 20 and the first stirring shaft 312 are respectively disposed on opposite sides of the coupling 40, which is convenient for installation and maintenance.

[0043] It can be understood that the transmission assembly 33 (for example, the shell 335 described later) of the stirring device 1 of the embodiment of the present application 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 agitators, the underwater bearing is easy to be 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, the bearing 50 is not easy to be 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 arranged at intervals, 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 opposite direction.

[0045] Exemplarily, the driving device 20 of the embodiment of the present application includes a variable frequency motor and a 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 the process needs, so as to improve the processing effect. The embodiment of the present application does not limit the output speed of the reducer, and the output speed of the 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 can be understood that the lifting capacity of the 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 practical applications, on the one hand, the impeller diameter of the stirring device is limited by the space occupied by the application site (such as a flocculation tank); on the other hand, too high a stirring shaft speed can easily lead to the destruction of the floccules, affecting the treatment effect, so it is difficult to increase the lifting capacity of the stirring device by increasing the impeller and the speed.

[0047] Based on this, the embodiment of the present application forms a stirring part 30 with a double-layer impeller structure through 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 first, 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 amount requirements. In addition, in the case of a high depth of the application site (for example, a flocculation tank), the stirring part 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 amount, and 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 second impeller assembly 32 is connected to the first impeller assembly 31 in a transmission manner ... Figure 1The stirring device 1 of the embodiment of the present application has a self-balancing ability through the mirror-designed first impeller assembly 31 and the second impeller assembly 32, which can reduce the load of the first impeller assembly 31 and the second impeller assembly 32 of the stirring portion 30 when they move, 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 Combined with 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, Figure 1 and Figure 3 As shown, the first end 3121 of the first stirring shaft is transmission-connected to the driving device 20, the second stirring shaft 322 is sleeved outside the first stirring shaft 312, and the first end 3221 of the second stirring shaft is transmission-connected to the transmission assembly 33, the first impeller 311 is fixedly provided at the second end 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 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 3 333 and gear 4 334 .

[0053] Specifically, Figure 4 and Figure 5 As shown, the gear 1 331 is fixedly sleeved on the first end 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 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 in 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 434 both 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 434 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. In addition, the gear 333 and the gear 434 both include a rotation axis, and 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 434 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 mesh 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 along the second direction R, firstly, the gear 1 331 rotates synchronously with the first stirring shaft 312 along the second direction R, and secondly, since the gear 1 331 is meshed with the gear 3 333 and the gear 3 333 is meshed with the gear 4 334, the gear 3 333 rotates with the gear 1 331, the gear 4 334 rotates with the gear 3 333 and the rotation direction of the gear 4 334 is the same as the rotation direction of the gear 1 331; finally, since the gear 2 332 is meshed with the gear 4 334, the gear 2 332 rotates with the gear 4 334, the second stirring shaft 322 rotates with the gear 2 332 and the rotation direction of the gear 4 334 is opposite to the rotation direction of the gear 2 332. That is, the rotation direction of the second stirring shaft 322 is opposite to the rotation direction of the first stirring shaft 312.

[0055] Thus, 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 to rotate in the second direction R in a synchronous manner through the transmission assembly 33 .

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

[0057] For example, reference Figure 1 Combined with Figure 4 The transmission assembly 33 of the embodiment of the present application further includes a housing 335, and the housing 335 is threadedly connected to the bracket 10. Gear 1 331, gear 2 332, gear 3 333 and gear 4 334 are all arranged in the housing 335, and lubricant (not shown in the figure) is filled between gear 1 331, gear 2 332, gear 3 333 and 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 (as shown in the direction e in the figure), the first impeller 311 can rotate clockwise along the second direction R synchronously with the first stirring shaft 312. 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 counterclockwise along the second direction R (as shown in the direction e in the figure) synchronously with the first stirring shaft 312. Figure 1 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 two components move in a synchronous mirroring manner (as shown in directions e and f), and both have a lifting effect upward along 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 is made by taking the first impeller 311 as an example.

[0061] like Figure 6 As shown, the first impeller 311 includes a Figure 6 Three blades 301 are arranged around the first stirring shaft (not shown in the figure) in the R direction. For example, each blade 301 is a curved streamline 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 (for example, sewage) can flow smoothly along the surface of the blade 301, reduce turbulence and separation, and reduce the resistance encountered by the sewage when passing through the blade 301.

[0062] Therefore, the curved streamlined design of the blade 301 of the embodiment of the present application conforms to fluid mechanics and has a large projection coverage, a strong lifting capacity in the axial direction (i.e., the first direction X), a small power factor, and saves the consumption of stirring power. At the same time, the curved shape reduces the shearing effect of the blade 301 on the floccules, and the floccules continue to grow during the lifting process, thereby enhancing the adsorption effect. Furthermore, the curved streamlined blade 301 of the embodiment of the present application improves the effect of sewage treatment.

[0063] The embodiment of the present application does not specifically limit the specific shape and number of the blades 301, as long as the efficiency of the stirring device 1 can be improved. For example, the number of blades 301 of the first impeller 311 can also be two, four, five or more, and the shape of each blade 301 is an S-shaped blade or a spiral blade.

[0064] Exemplarily, the projection coverage of the first impeller 311 of 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, so that when the application site (for example, a flocculation tank) has limited space, 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 of 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 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 the 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 due to the radial forceR , we can know that:

[0069] M R =(∑F hi ·L i +9.81m w1 ·L e ·sinα+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 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, K 1 Refers to the radial force coefficient of the fluid, which can be determined based on 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 rotation speed of the stirring shaft (ie, the rotation 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] The value of (n / nk) is 0.5, and [e] refers to the allowable eccentricity at the combined center of gravity of the agitator shaft (including the first agitator shaft 312 and the second agitator 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 move synchronously in opposite directions (such as Figure 1 Thus, the direction of the bending moment acting on the first stirring shaft 312 in the embodiment of the present application is opposite to the direction of the bending moment acting on the second stirring shaft 322. Furthermore, the bending moment of the second impeller assembly 32 acting on the second stirring shaft 322 in the embodiment of the present application can balance the bending moment of the first impeller assembly 31 acting on the first stirring shaft 312.

[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 of 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, and the fluid radial force coefficient K 1 =1, the allowable eccentricity at the combined center of gravity of the stirring shaft and each impeller assembly [e] = 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 rotation speed n of the stirring shaft in the embodiment of the present application is the rotation speed of the first stirring shaft 312, n=56r / min.

[0084] As described above, the structure of the first impeller 311 of the embodiment of the present application is the same as the structure of the second impeller 321, so 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 The same; then P q1 =P q2 =1.1kw, D J1 =D J2 =1.35m.

[0085] According to calculation, the radial force of the embodiment of the present application causes a bending moment MR acting on the first stirring shaft 312. 1 The radial force causes a bending moment MR acting on the second stirring shaft 322. 2 is 1131 N·m, that is, the percentage of the bending moment 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: MR 1 / MR 2 *100%=86.3%.

[0086] Therefore, the stirring device 1 of the embodiment of the present application has a self-balancing ability. The second stirring shaft 322 balances the bending moment acting on the first stirring shaft 312 caused by the radial force, thereby avoiding 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 of the stirring shaft (for example, the first stirring shaft 312 and the second stirring shaft 322) by adopting the 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 lifting structure formed by the first impeller 311 and the second impeller 321 increases the lifting amount and lifting effect of the stirring device 1, improves the sewage treatment effect, and reduces 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 saving 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 is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several 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, arranged on the support; 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 arranged at intervals; 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 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 that 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, 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 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 projection coverage ratio of the first impeller is comprised between 25% and 40%, and a projection 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 impellers 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 one is fixedly arranged at one end of the first stirring shaft close to the driving device, the gear two is fixedly arranged at one end of the second stirring shaft close to the driving device, the gear one is meshed with the gear three, the gear two is meshed with the gear four, and the gear three is meshed with the gear four.

6. The stirring device according to claim 5, characterized in that The gear three and the gear four both include a rotating shaft, and the rotating shafts of the gear three and the gear four extend along the first direction respectively 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 one, the gear two, the gear three and the gear four are all arranged in the housing, and a lubricant is arranged between the gear one, the gear two, the gear three and the gear four and the housing.

8. The stirring device according to claim 5, characterized in that The gear one, the gear two, the gear three and the gear four are all cylindrical gears.

9. The stirring device according to claim 2, characterized in that: 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, characterized in that: The driving device comprises 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, characterized in that: The stirring device further comprises a bearing, wherein the bearing is arranged in the bracket, and 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, wherein the coupling is arranged in the bracket and respectively connects the driving device and the first stirring shaft of the first impeller assembly.

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