A stirring multi-stage sewage treatment device

Abstract

The present invention provides a stirring multi-stage sewage treatment device, comprising an impeller and a driving part, wherein the driving part drives the impeller to rotate via a shaft, wherein at least one impeller is axially spaced apart on the shaft, and each impeller's single blade is composed of two blade units mounted back to back, wherein the blade unit is in a "Y"-shaped structure, and a gap is provided between the back-flow surfaces of adjacent blade units in a single blade; and each blade unit is provided with a blade hole. The blade unit is symmetrically formed into a "Y"-shaped structure by the upper half of the blade and the lower half of the blade, wherein the upper half of the blade and the lower half of the blade are respectively provided with blade holes, and the incoming-drainage surface of the "Y"-shaped structure is radially parallel to the impeller, and is used to make the blade unit contact the fluid in a tangential direction. The present invention controls the maximum supercavitation area and the optimal cavitation degradation effect through the structural form of specific blades, and has a simple appearance, is easy to install and replace, has strong adaptability to working conditions, and has low production costs.

Description

Technical Field

[0001] The invention relates to the field of cavitation devices, in particular to a stirring multi-stage sewage processor. Background Art

[0002] Hydrodynamic cavitation degradation technology releases a large amount of energy into the surrounding liquid through the collapse of cavitation bubbles. This huge energy release has the following effects: (1) Mechanical effect: It generates a large number of shock waves with extremely high instantaneous pressure and shear stress. (2) Thermal effect: It forms local hot spots with extremely high temperatures, and heating and cooling occur within microseconds. (3) Chemical effect: Water molecules can be decomposed into -OH active free radicals with strong oxidizing properties. These radicals have an extremely high oxidation potential (2.80 eV) and can undergo rapid chain reactions with most organic pollutants, oxidizing harmful substances into CO2, H2O or mineral salts without secondary pollution.

[0003] Due to increasingly severe environmental pollution, the quality of my country's water resources continues to decline. Wastewater discharge is a major source of water pollution, and current treatment processes for organic wastewater are often suboptimal. Harnessing the enormous energy generated by hydraulic cavitation to achieve near-complete degradation of most organic pollutants is one of the newest solutions to address current water pollution issues.

[0004] The prior art discloses a vortex cavitation device, comprising an inlet pipe, a vortex chamber, a cavitation block, and a baffle. The device operates by passing organic wastewater at a certain pressure and flow rate through the inlet pipe. Due to a certain low pressure, the organic wastewater enters the double-helix narrow slit in the cavitation chamber, causing cavitation. The cavitated organic wastewater then passes through the cavitation block, further accelerating the flow rate and causing cavitation. The organic wastewater, containing cavitation bubbles, is discharged through the conical aperture at the bottom, impacting the baffle below, causing the cavitation to collapse and intensify the cavitation effect. Although the device has a simple structure, it suffers from significant energy loss and can rapidly damage key components. The prior art discloses a hydraulic cavitation device for wastewater treatment, featuring multiple cavitation channels and high cavitation efficiency. Ozone can also be introduced into the cavitation chamber. Under the high temperature and high pressure conditions generated by the hydraulic cavitation effect, ozone decomposes into hydroxyl radicals, which have a stronger oxidizing property, further improving cavitation efficiency. The prior art discloses a vortex cavitator used in the field of chemical separation technology, which can perform low-cost and high-efficiency demulsification treatment on aqueous emulsified oil or emulsified oily wastewater at a relatively low temperature and without or with a small amount of chemical demulsifier.

[0005] The above patents mainly focus on sewage cavitation degradation devices and methods based on jet cavitation or plate structures. They cannot achieve efficient cavitation degradation treatment of large-flow sewage, and have high requirements and restrictions on the installation and working mode of the device. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the present invention provides a stirring multi-stage sewage treatment device. In order to ensure efficient cavitation degradation, the structure of specific blades is used to control the maximum supercavitation area and the optimal cavitation degradation effect. It has a simple appearance, is easy to install and replace, has strong adaptability to working conditions, and has low production costs.

[0007] The present invention achieves the above technical objectives through the following technical means.

[0008] A stirring multi-stage sewage treatment device includes an impeller and a driving part. The driving part drives the impeller to rotate through a shaft. At least one impeller is axially spaced apart on the shaft. The single blade of each impeller is composed of two blade units installed back to back. The blade units have a "Y"-shaped structure, and a gap is provided between the back-flow surfaces of adjacent blade units in the single blade; each blade unit is provided with a blade hole.

[0009] Furthermore, the blade unit is symmetrically composed of the upper half of the blade and the lower half of the blade to form a "Y"-shaped structure, and the upper half of the blade and the lower half of the blade are respectively provided with blade holes. The flow-inflow-drainage surface of the "Y"-shaped structure is parallel to the impeller radial direction, which is used to make the blade unit contact the fluid in a tangential direction.

[0010] Furthermore, the included angle between the central axis of the blade hole on the blade unit in the "Y"-shaped structure and the symmetry plane between the upper half of the blade and the lower half of the blade is 15° to 75°.

[0011] Furthermore, at least two rows of blade holes are provided on the surfaces of the upper half of the blade and the lower half of the blade, and the blade holes on the upper half of the blade and the lower half of the blade are staggered.

[0012] Furthermore, the blade hole is in the form of a straight hole, a tapered hole, or a stepped hole.

[0013] Furthermore, the maximum angle θ1 between the upper half of the blade and the lower half of the blade is 90° to 180°.

[0014] Furthermore, at least two impellers are mounted in series on the shaft, and the phase angles of single blades of adjacent impellers correspond one to one.

[0015] Furthermore, a cavitation gap is provided between the single blades of adjacent impellers, for forming a cavitation area on both sides between the lower half of the blade of one impeller and the upper half of the blade of the adjacent impeller.

[0016] Furthermore, the range of the cavitation gap δ is (0.05h, 0.15h), where h is the center distance between the two impellers.

[0017] The beneficial effects of the present invention are:

[0018] 1. The stirring multi-stage sewage treatment device described in the present invention drives the blades to rotate in the sewage medium through a power mechanism, so that the entire flow-inflow-drainage surface of the blades is in a supercavitation state. In this state, the bubbles in the supercavitation area gradually collapse, releasing huge amounts of energy into the surrounding liquid. The mechanical effects, thermal effects and chemical reactions generated by this energy are used to achieve sewage degradation treatment.

[0019] 2. The stirring multi-stage sewage treatment device described in the present invention has blade holes on the blades with a "Y"-shaped structure. The fluid passes through the blade holes in the upper and lower parts of the blades, generating cavitation clouds, forming fluid collisions, and shearing with the low-speed fluid in the space, causing the cavitations to completely collapse.

[0020] 3. The stirring multi-stage sewage treatment device described in the present invention can rotate both forward and reverse, and the multi-stage structure can increase the efficiency of the treatment device. This is because the increase in the number of blades increases the sewage treatment capacity. Secondly, the upper and lower corresponding blades form multiple cavitation areas. The fluid enters from the left side. First, the fluid is accelerated through the lower part and the upper part of the blade. At this time, the fluid has a higher speed and meets and impacts in area A to produce vortices. In addition, the fluid flows out from the structurally contracted area A, causing the fluid pressure to further drop. When it drops to near the saturated vapor pressure of the liquid, cavitation occurs. In addition, the fluid passes through the blade holes on the upper part and the lower part of the blade to produce cavitation bubbles, such as Figure 3 As shown by the arrows in areas B and C, the uncollapsed cavitations and the high-speed fluid collide to generate vortices. Then, the cavitations generated in areas A, B, and C are drained to the high-pressure area under the action of the high-speed fluid, and completely collapse in area D, releasing huge energy for the degradation of organic matter in the sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of the stirring multi-stage sewage treatment device described in the present invention.

[0023] Figure 2 for Figure 1 AA cross-sectional view.

[0024] Figure 3 It is a schematic diagram of the direction of fluid flow between the two-stage stirring blades.

[0025] Figure 4It is a schematic diagram of the fluid flow direction between the corresponding blades of the stirring single stage.

[0026] Figure 5 Schematic diagram of the cavitation gap.

[0027] In the picture:

[0028] 1-motor; 2-shaft; 3-impeller; 4-single blade; 41-left blade; 42-right blade; 43-blade hole; 44-upstream-flow-guiding surface; 45-fixed disk; 46-upper part of the blade; 47-lower part of the blade; 48-backstream surface. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] like Figure 1As shown, the stirring multi-stage sewage treatment device described in the present invention includes an impeller 3 and a driving part, and the driving part drives the impeller 3 to rotate through the shaft 2. At least one impeller 3 is axially spaced apart on the shaft 2. The single blade 4 of each impeller 3 is composed of two blade units installed back to back. The blade unit 4 has a "Y"-shaped structure, and a gap is provided between the back-flow surfaces of adjacent blade units in the single blade 4; each of the blade units 4 is provided with a blade hole 43.

[0033] Figure 2 This is a diagram of a single blade structure. The single blade 4 includes a left blade 41 and a right blade 42. The left blade 41 and the right blade 42 are respectively in a "Y"-shaped structure. The tail of the left blade 41 in the "Y"-shaped structure and the tail of the right blade 42 in the "Y"-shaped structure are symmetrically arranged back to back. The head of the left blade 41 is the incoming flow-guiding surface 44, and the tail of the left blade 41 is the back flow surface 48; there is a gap between the back flow surface 48 of the left blade 41 and the back flow surface 48 of the right blade 42; it needs to be explained that when Figure 1 When rotating clockwise, the backflow surface 48 of the left blade 41 is at the tail, and the backflow surface 48 of the right blade 42 is at the head. Figure 1 When rotating counterclockwise, the backflow surface 48 of the right blade 42 is at the tail, and the backflow surface 48 of the left blade 41 is at the head. This will result in a gap between the backflow surface 48 of the left blade 41 and the backflow surface 48 of the right blade 42, which is incomprehensible. The gap between the backflow surface 48 of the left blade 41 and the backflow surface 48 of the right blade 42 of the present invention actually refers to a gap between the tail of the right blade 42 and the tail of the left blade 41, or a gap between the backflow surface 48 of the left blade 41 when rotating clockwise and the backflow surface 48 of the right blade 42 when rotating counterclockwise. This design can meet the design requirements of the forward and reverse rotation of the stirring multi-stage sewage treatment device.

[0034] Taking the left blade 41 as an example, the left blade 41 is symmetrically formed into a "Y"-shaped structure consisting of an upper blade portion 46 and a lower blade portion 47. The left blade 41 is mounted on a fixed plate 45. Each of the upper and lower blade portions 46 and 47 is provided with a blade hole 43. The flow-inflow-discharge surface 44 of the "Y"-shaped structure is parallel to the radial direction of the fixed plate 45, ensuring that the blade unit 4 comes into tangential contact with the fluid. The angle between the central axis of the blade hole 43 in the upper blade portion 46 and the plane of symmetry between the upper and lower blade portions 46 and 47 is 15° to 75°. In other words, the angle θ between the central axis of the blade hole 43 in the upper blade portion 46 and the central axis of the blade hole 43 in the lower blade portion 47 is 30° to 150°. At least two rows of blade holes 43 are formed on the surfaces of the upper and lower blade portions 46 and 47, and the blade holes 43 in the upper and lower blade portions 46 and 47 are staggered. The blade holes 43 are in the form of straight holes, tapered holes, or stepped holes. The maximum angle θ1 between the upper blade portion 46 and the lower blade portion 47 is between 90° and 180°. The blade holes 43 are provided on the left blade 41, which has a "Y"-shaped structure. Fluid passing through the blade holes 41 in the upper blade portion 42 and the lower blade portion 43 generates a cavitation cloud, forming a fluid collision and shearing with the low-velocity fluid in the space, completely collapsing the cavitation.

[0035] like Figure 4 As shown, when the single-stage stirring multi-stage sewage treatment device is working, it can rotate forward or reverse without affecting the efficiency of the treatment device at this time. A part of the fluid generates vortex in the blade groove with a "Y" shape structure (area a), and a part of the fluid passes through the blade hole 41 on the upper part 46 of the blade and the lower part 47 of the blade. The contraction structure causes the fluid pressure to drop. When it drops to near its saturated vapor pressure, cavitation is generated. In addition, the outflowing fluid has a high speed, and the mutual shearing also generates cavitation, which is collapsed in area b; part of the fluid in area b flows out from the upper and lower directions (as shown by the arrows in the figure), and is drained to the high-pressure area for complete collapse, and part flows out from the blade hole 43 on the right blade, generates cavitation again, and disperses into the high-pressure area of ​​area c for complete cavitation collapse, releasing huge energy for the degradation of organic matter in sewage, and will not affect the following blades. Figure 4 The distances L1 and L2 between the blade holes and the axis of the two corresponding blades can be equal or different. When the distances are different, when the fluid between the two blades flows out from the blade hole on the other side, more obvious bypass will occur, which is also prone to cavitation.

[0036] Another embodiment, such as Figure 3As shown, at least two impellers 3 are mounted in series on the shaft 2, and the phase angles of the single blades 4 of adjacent impellers 3 correspond one to one. A cavitation gap is provided between the single blades 4 of adjacent impellers 3, which is used to form a cavitation area on both sides between the lower half 47 of the blade of one impeller 3 and the upper half 46 of the blade of the adjacent impeller 3. Figure 3 As shown, when a two-stage or multi-stage stirring sewage treatment device is used to treat sewage, it can rotate forward or reverse, and the multi-stage structure can increase the efficiency of the treatment device. There are two reasons for this effect: First, the increase in the number of blades increases the sewage treatment capacity. Second, as shown in the figure, the upper and lower corresponding blades 4 form multiple cavitation areas. The fluid enters from the left side. First, the fluid is accelerated through the upper half 46 of the blade and the lower half 47 of the blade. At this time, the fluid has a higher speed and meets and collides in area A to produce vortices. In addition, the fluid flows out from the structurally contracted area A, causing the fluid pressure to further drop. When it drops to near the saturated vapor pressure of the liquid, cavitation occurs. In addition, the fluid passes through the blade holes 43 on the upper half 46 and the lower half 47 of the blade to produce cavitation bubbles, as shown in FIG. Figure 3 As shown by the arrows in areas B and C, the uncollapsed cavitations and the high-speed fluid collide to generate vortices. Then, the cavitations generated in areas A, B, and C are drained to the high-pressure area under the action of the high-speed fluid, and completely collapse in area D, releasing huge energy for the degradation of organic matter in the sewage.

[0037] like Figure 5 As shown, a cavitation gap δ is provided between the single blades 4 of adjacent impellers 3 to form a cavitation zone on both sides between the lower blade half 47 of one impeller 3 and the upper blade half 46 of the adjacent impeller 3. The range of cavitation gap δ is (0.05h, 0.15h), where h is the center-to-center distance between the two impellers 3. If the cavitation gap δ is too large, cavitation cannot be achieved, while if the cavitation gap δ is too small, the flow area is too small, affecting cavitation efficiency. Generally, the height of the upper blade half 46 and the lower blade half 47 is h1, and the center-to-center distance h between the two impellers 3 is preferably 2.1 to 2.3h1.

[0038] The agitator-type multi-stage sewage treatment device of the present invention requires surface strengthening treatment when it is in long-term operation. When the blade surface is severely damaged, the blade needs to be replaced to continue sewage treatment. The agitator-type multi-stage sewage treatment device of the present invention has a wide range of installation applications, and the blade working space can adopt a cylindrical box or a rectangular box.

[0039] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0040] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stirring multi-stage sewage treatment device, comprising an impeller (3) and a driving part, wherein the driving part drives the impeller (3) to rotate through a shaft (2), characterized in that: At least one impeller (3) is axially spaced apart on the shaft (2), and a single blade (4) of each impeller (3) is composed of two blade units installed back to back, the blade units (4) are in a "Y"-shaped structure, and a gap is provided between the back-flow surfaces of adjacent blade units in the single blade (4); each blade unit (4) is provided with a blade hole (43); The blade unit (4) is symmetrically formed into a "Y"-shaped structure by a blade upper half (46) and a blade lower half (47), wherein the blade upper half (46) and the blade lower half (47) are respectively provided with blade holes (43). The flow-inflow-discharge surface (44) of the "Y"-shaped structure is radially parallel to the impeller (3), and is used to enable the blade unit (4) to contact the fluid in a tangential direction.

2. The stirring multi-stage sewage treatment device according to claim 1, characterized in that: The angle between the central axis of the blade hole (43) on the blade unit in the "Y"-shaped structure and the symmetry plane between the upper half (46) and the lower half (47) of the blade is 15° to 75°.

3. The stirring multi-stage sewage treatment device according to claim 1, characterized in that: At least two rows of blade holes (43) are provided on the surfaces of the upper blade part (46) and the lower blade part (47), and the blade holes (43) on the upper blade part (46) and the lower blade part (47) are staggered.

4. The stirring multi-stage sewage treatment device according to claim 1, characterized in that: The blade hole (43) is in the form of a straight hole, a tapered hole, or a stepped hole.

5. The stirring multi-stage sewage treatment device according to claim 1, characterized in that: The maximum included angle θ1 between the upper half (46) and the lower half (47) of the blade is 90° to 180°.

6. The stirring multi-stage sewage treatment device according to any one of claims 1 to 5, characterized in that: At least two impellers (3) are mounted in series on the shaft (2), and the phase angles of the single blades (4) of adjacent impellers (3) correspond one to one.

7. The stirring multi-stage sewage treatment device according to claim 6, characterized in that: A cavitation gap δ is provided between the single blades (4) of adjacent impellers (3) for forming a cavitation area on both sides between the lower half (47) of the blade of one impeller (3) and the upper half (46) of the blade of the adjacent impeller (3).

8. The stirring multi-stage sewage treatment device according to claim 7, characterized in that: The range of the cavitation gap δ is (0.05h, 0.15h), where h is the center distance between the two impellers (3).

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