Impeller Assembly and Mixing Device

Abstract

This application discloses an impeller assembly and a mixing device, which relates to the technical field of a solid and liquid mixing device, and includes an impeller structure and a casing structure, the impeller structure includes a body, the surface of the body is provided with a plurality of backward-facing blades, the blade angle in any flow surface of the backward-facing blades decreases from the inlet to the outlet and then increases, the lower part of the body is provided with a first shutter, the casing structure includes a second shutter, the first shutter is provided with a first guide groove, the second shutter is provided with a second guide groove, the fluid enters from the inlet at the upper part of the body, flows along the surface of the body, and flows out through the outlet at the lower part of the body, the first guide groove and the second guide groove, the center line of the first guide groove is deflected in the opposite direction to the rotation direction of the impeller structure, and the center line of the second guide groove is deflected in the rotation direction of the impeller structure. This application solves the problems of unstable discharge, large vibration and noise, and insufficient work efficiency.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims priority to a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on October 13, 2021, bearing application number 202111190681.9 and titled "Impeller Assembly and Mixing Device," the entire contents of which are incorporated herein by reference. [Technical field] The present application relates to the technical field of solid and liquid mixing devices, and in particular to impeller assemblies and mixing devices. [Background technology]

[0002] In the related art, the blades have no special design for the inner blade blade shape and fluid flow path, the blades' working capacity for the fluid is limited, and the multi-layer shutter creates a large obstruction to the fluid movement, making it difficult to discharge, so the fluid needs to be accelerated and discharged by the discharge blades on the outside of the shutter. However, the forced acceleration and discharge of the fluid by the discharge blades causes large pressure fluctuations in the discharge cavity, which causes pulsation of the discharge flow rate, generates large noise and vibration, and reduces the operating efficiency of the dispersion device. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application aims to provide an impeller assembly and a mixer that solves the problems existing in the prior art and that tend to occur in dispersion devices that use a centrifugal discharge method when the viscosity of a solid-liquid mixture is high, such as unstable discharge, high vibration and noise, and insufficient operating efficiency. [Means for solving the problem]

[0004] In order to achieve the above object, the present application provides the following technical solution:

[0005] The present application provides an impeller assembly including an impeller structure and a casing structure which rotate relative to one another, the impeller structure including a main body, a surface of the main body being provided with a plurality of rearward facing blades along a circumferential direction of the main body, at least one layer of first shutters being provided on a lower portion of the main body, the first shutters being provided on the outer side of each of the rearward facing blades, the casing structure including at least one layer of second shutters being located inside and / or outside the first shutter, the first shutters being provided with a plurality of first guide grooves, and the second shutters being provided with a plurality of second guide grooves, a fluid entering from an inlet at an upper portion of the main body, flowing along the surface of the main body, and flowing out through an outlet at a lower portion of the main body, the first guide groove, and the second guide groove, a center line of the first guide groove being deflected in a direction opposite to a rotation direction of the impeller structure, and a center line of the second guide groove being deflected in a rotation direction of the impeller structure.

[0006] Preferably, the size of the body gradually increases from the top of the body to the bottom of the body, and the surface of the body is curved.

[0007] Preferably, the blade angle of the rearward facing blades on either flow surface gradually decreases and then gradually increases from the inlet to the outlet, said blade angle being the angle between a tangent to a surface arc of the rearward facing blade and an axial plane of the impeller structure.

[0008] Preferably, the blade angle at the inlet is between 20° and 80°, and the blade angle at the outlet is between 0° and 30°.

[0009] Preferably, the angle between the center line of the first guide groove and the radial direction of the center axis of the main body is between 15° and 50°.

[0010] Preferably, the angle between the center line of the second guide groove and the radial direction of the center axis of the main body is between 35° and 80°.

[0011] The present application further provides a mixing device including the impeller assembly. Effect of the Invention

[0012] The present application provides the following technical advantages over the prior art.

[0013] The backward blades adopted in the present application can be well coupled with the flow of the fluid when rotating, so that the backward blades on the main body can work more efficiently on the fluid, and in particular, the blade angle on either flow surface of the backward blades is designed to decrease and then increase from the inlet to the outlet by simulation calculation, so that the backward blades can work more efficiently on the fluid, while the first shutter is provided with a first guide groove and the second shutter is provided with a second guide groove, and the direction of the first guide groove and the second guide groove reduces the kinetic energy loss when the fluid passes through the first shutter and the second shutter. After the fluid is dispersed by the dispersion area between the first shutter and the second shutter, it still has sufficient kinetic energy to be centrifuged and discharged, so that there is no need to add more discharge blades to work on the fluid, and the disturbance to the fluid in the discharge area can be greatly reduced, the fluid pressure in the discharge area can be maintained uniformly and stably, the fluid is discharged at a stable flow rate, and the vibration and noise caused by pulsation can be eliminated.

[0014] Hereinafter, in order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the drawings that need to be used in the embodiments will be briefly described. The drawings in the following description are only some embodiments of the present application, and it is obvious to those skilled in the art that they can also obtain other drawings based on these drawings without creative labor. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a schematic diagram of the impeller assembly of the present application. [Diagram 2] Cross section AA of Figure 1. [Diagram 3] FIG. 3 is a partial enlarged view of a portion I in FIG. [Figure 4]FIG. 2 is a schematic structural diagram of the impeller of the present application. [Diagram 5] FIG. 2 is a structural schematic diagram of a casing according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is clear that the described embodiments are only some of the embodiments of the present application, and are not all of the embodiments. All other embodiments obtained by those skilled in the art without creative labor through the embodiments of the present application belong to the scope of the claims of the present application.

[0017] The present application aims to provide an impeller assembly and a mixer that solves the problems existing in the prior art and that tend to occur in dispersion devices that use a centrifugal discharge method when the viscosity of a solid-liquid mixture is high, such as unstable discharge, high vibration and noise, and insufficient operating efficiency.

[0018] In order to make the above objects, features and advantages of the present application more clearly understandable, the present application will be described in more detail below with reference to the drawings and specific embodiments.

[0019] Example 1 As shown in Figs. 1 to 5, this embodiment provides an impeller assembly 100, and the impeller assembly 100 includes an impeller structure 1 and a casing structure 2 which rotate relative to each other. The impeller structure 1 includes a main body 3, a surface of the main body 3 is provided with a plurality of rearward facing blades 4 along the circumferential direction of the main body 3, at least one layer of first shutters 5 is provided on the lower part of the main body 3, the first shutters 5 are provided on the outside of each rearward facing blade 4, the casing structure 2 includes at least one layer of second shutters 6, the second shutters 6 are located on the inside and / or outside of the first shutters 5, in this embodiment, the casing structure 2 is provided with two layers of second shutters 6, an inner layer and an outer layer, which are respectively located on the inside and outside of the first shutters 5, the second shutters 6 are fitted and engaged with the outer periphery of the first shutters 5, the first shutters 5 are provided with a plurality of first guide grooves 7 along the circumferential direction, and the first shutters 5 are provided with a plurality of first guide grooves 7 along the circumferential direction of the first shutters 5. The guide grooves 7 are uniformly distributed on the first shutter 5, and a plurality of second guide grooves 8 are opened along the circumferential direction of the two layers of the second shutter 6, the second guide grooves 8 are uniformly distributed on the second shutter 6, the cross-sectional shapes of the first guide grooves 7 and the second guide grooves 8 are similar to rhombuses, and the deflections of the first guide grooves 7 and the second guide grooves 8 are alternately installed. This impeller assembly 100 is a main body 3 of the impeller structure 1. A fluid inlet is provided at the upper end of the impeller structure 1 and a fluid outlet is provided at the lower end of the main body 3 of the impeller structure 1, the fluid enters from the inlet at the top of the main body 3, flows along the surface of the main body 3, and flows out in order through the outlet at the bottom of the main body 3, the second guide groove 8 on the inside, the first guide groove 7 and the second guide groove 8 on the outside, the center line of the first guide groove 7 deflected in the opposite direction to the rotation direction of the impeller structure 1, and the center line of the second guide groove 8 deflected in the rotation direction of the impeller structure 1.

[0020] In this embodiment, the impeller structure 1 rotates clockwise around the axis of the main body 3 with the arrangement direction in FIG.

[0021] In this embodiment, the size of the body 3 gradually increases from the top of the body 3 to the bottom of the body 3, the body 3 is a truncated cone, and the surface of the body 3 is a curved surface. The meridian flow line from the inlet to the outlet of the body 3 is an inward approximately arc-shaped curve.

[0022] In this embodiment, the blade angle on either flow surface of the backward blade 4 gradually decreases from the inlet to the outlet and then gradually increases, the blade angle is the angle between the tangent to the arc line of the surface of the backward blade 4 and the axial plane of the impeller structure 1, and is a positive value.

[0023] In this embodiment, the gap between the backward-directed vanes 4 and the casing varies continuously and smoothly from the inlet to the outlet.

[0024] In this embodiment, the blade angle at the inlet is 20° to 80°, the blade angle at the outlet is 0° to 30°, and the smallest blade angle is 0° to 30°. The blade angle distribution is related to the air load distribution of the rearward-facing blades 4, and based on the fluid simulation results for the rearward-facing blades 4, the blade angle distribution is adjusted so that the fluid flow and the rearward-facing blades 4 can be suitably coupled, thereby ensuring that the rearward-facing blades 4 work efficiently on the fluid.

[0025] In this embodiment, the angle between the center line of the first guide groove 7 and the radial direction of the central axis of the main body 3 (i.e., β2) is 15° to 50°. The angle between the center line of the second guide groove 8 and the radial direction of the central axis of the main body 3 (i.e., β1 and β3) is 35° to 80°. Specifically, as shown in FIG. 3, β1 is the angle between the center line L1 of the inner second guide groove 8 and the radial line R1, β2 is the angle between the center line L2 of the first guide groove 7 and the radial line R2, and β3 is the angle between the center line L3 of the outer second guide groove 8 and the radial line R3. The radial line R1, the radial line R2, and the radial line R3 are all lines extending radially from the central axis of the main body 3. The intersection of the center line L1 and radial line R1 of the second guide groove 8 of the second shutter 6 in the inner layer is on the circumference where the inner wall of the second shutter 6 in the inner layer is located, the intersection of the center line L2 and radial line R2 of the first guide groove 7 is on the circumference where the inner wall of the first shutter 5 is located, and the intersection of the center line L3 and radial line R3 of the second guide groove 8 of the second shutter 6 in the outer layer is on the circumference where the inner wall of the second shutter 6 in the outer layer is located.

[0026] As shown by the arrow in Fig. 3, the rotation direction of the impeller assembly 100 in this embodiment is controlled by adjusting the blade angle to control the fluid load distribution of the backward blades 4, and the blade angle distribution is used to suitably couple the rotation of the backward blades 4 with the flow of the fluid, so that the backward blades 4 provided on the body 3 work more efficiently on the fluid. Meanwhile, the first guide groove 7 is opened in the first shutter 5, and the second guide groove 8 is opened in the second shutter 6, and the directions of the first guide groove 7 and the second guide groove 8 reduce the kinetic energy loss when the fluid passes through the first shutter 5 and the second shutter 6. Specifically, the second shutter 6 fixed to the casing structure 2 is stationary, and the center line of the second guide groove 8 is deflected in the rotation direction of the impeller structure 1, so that the fluid can smoothly pass through the second guide groove 8 without changing its direction significantly. The first shutter 5 fixed to the impeller structure 1 rotates together with the impeller structure 1, so that the remaining part other than the first guide groove 7 can be regarded as a rearward-facing extension of the blade 4, and the first guide groove 7 can also be made into a rearward-facing structure, which is even more advantageous for performing work on the fluid.

[0027] After the fluid is dispersed by the dispersion area between the first shutter 5 and the second shutter 6, it is still centrifugally discharged with sufficient kinetic energy, and there is no need to add additional discharge blades to perform work on the fluid outside the outermost second shutter 6. This greatly reduces the disturbance to the fluid in the discharge area, and the fluid pressure in the discharge area can be maintained uniform and stable, the fluid is discharged at a stable flow rate, and pulsating vibration and noise can be eliminated.

[0028] Example 2 This embodiment provides a mixing device including the impeller assembly 100 of the first embodiment.

[0029] In this specification, the principle and embodiments of the present application are described using specific examples, and the above description of the examples is for the purpose of facilitating the understanding of the method and gist of the present application. At the same time, those skilled in the art may also make changes in specific embodiments and application scope based on the gist of the present application. In summary, the contents of this specification should not be understood as limiting the present application. [Explanation of symbols]

[0030] 100 Impeller Assembly 1 Impeller structure 2. Casing structure 3. Main unit 4 Backward-facing wings 5 First Shutter 6 Second Shutter 7 First guide groove 8 Second guide groove

Claims

1. 1. An impeller assembly including an impeller structure and a casing structure which rotate relative to one another, the impeller structure including a main body, a surface of the main body being provided with a plurality of rearward facing blades along a circumferential direction of the main body, at least one layer of first shutters being provided on a lower portion of the main body, the first shutters being provided on the outside of each of the rearward facing blades, the casing structure being provided with two layers of second shutters, an inner layer and an outer layer, located on the inner side and the outer side of the first shutter, respectively, a plurality of first guide grooves being formed in the first shutter, and a plurality of second guide grooves being formed in the second shutter, a fluid enters from an inlet at an upper portion of the main body, flows along the surface of the main body, and flows out through an outlet at a lower portion of the main body, the first guide groove, and the second guide groove, a center line of the first guide groove being deflected in a direction opposite to a rotation direction of the impeller structure, and a center line of the second guide groove being deflected in a rotation direction of the impeller structure.

2. 2. The impeller assembly of claim 1, wherein the size of the body gradually increases from the top of the body to the bottom of the body, and the surface of the body is curved.

3. The impeller assembly of claim 1, characterized in that the blade angle on any flow surface of the rearward-facing blade gradually decreases from the inlet to the outlet and then gradually increases, the blade angle being the angle between a tangent to the surface arc of the rearward-facing blade and an axial plane of the impeller structure, the axial plane being a plane formed by the axis of rotation of the impeller structure and a radial line passing through the intersecting point of the tangent on the surface arc.

4. 4. The impeller assembly of claim 3, wherein the blade angle at the inlet is between 20° and 80°, and the blade angle at the outlet is between 0° and 30°.

5. The impeller assembly according to claim 1, wherein an angle between a center line of the first guide groove and a radial direction of a center axis of the main body is between 15° and 50°.

6. The impeller assembly according to claim 1, wherein an angle between a center line of the second guide groove and a radial direction of a center axis of the main body is between 35° and 80°.

7. A mixing device comprising an impeller assembly according to any one of claims 1 to 6.

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