Venturi tube injection device
By designing the Venturi injection device, the annular gas distribution chamber and exhaust hole of the injector are used to uniformly release the gas into the fluid, which solves the problems of large volume and poor mixing uniformity of the gas flotation treatment equipment in the prior art, and realizes small bubbles The efficient production and mixing of oil droplets improves the absorption effect.
Patent Information
- Application Number
- CN202323194241.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-11-27
AI Technical Summary
In the existing air floatation treatment process, the generation of fine bubbles is insufficient in mixing with the fluid, resulting in a large volume of the equipment and the inability to efficiently remove oil droplets in the water.
Design a venturi injection device, including an upstream cylindrical section, a neck section, a throat, a conical diffusion section and a downstream cylindrical section, an outer ring and an inner ring are provided on the injector, a top cover and a bottom cover, and through an exhaust hole The gas is released evenly into the fluid, forming fine bubbles and mixing quickly.
The uniform distribution of gas in the fluid is achieved, the oil droplet absorption effect is improved, the volume of gas flotation equipment is reduced, and the processing efficiency is improved.
Smart Images
Figure CN222174432U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water purification device components, in particular to a venturi tube injection device. Background Art
[0002] Gas flotation technology is to fill the oil-containing water with air to form tiny bubbles, so that the dispersed oil droplets in the water adhere to the bubbles and float to the water surface with the bubbles, thereby achieving the purpose of oil removal. In the flotation process, the size of the bubbles and the uniformity of mixing with the fluid are important factors affecting the flotation treatment effect. Therefore, in the flotation treatment process, the generation of tiny bubbles and the performance of rapid and uniform mixing with the fluid are crucial.
[0003] In the prior art, a separate micro-bubble generator is generally used to generate tiny bubbles, and then the bubbles are evenly mixed in the fluid by stirring, swirling, etc., which makes the flotation equipment larger in size. Utility Model Content
[0004] The utility model aims to provide a venturi tube injection device, which is a device that can generate fine bubbles and quickly mix the bubbles in a fluid. When applied to a gas flotation process, the volume of a bubble generator and a mixing device in the gas flotation equipment can be greatly reduced.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A venturi tube injection device comprises a venturi tube, an injector is arranged inside the venturi tube, and an air supply pipeline is fixedly connected to the injector.
[0007] The utility model is further configured that the venturi tube includes an upstream cylindrical section, a necking section, a throat, a conical diffusion section and a downstream cylindrical section, and the upstream cylindrical section, the necking section, the throat, the conical diffusion section and the downstream cylindrical section are all fixedly connected, and the air supply pipeline runs through the venturi tube.
[0008] The utility model is further configured that the injector is provided with an outer ring and an inner ring.
[0009] The utility model is further configured that a cap is fixedly connected to one side of the injector, and a plurality of exhaust holes are opened on the cap.
[0010] Through the above technical solution, the gas injection direction of the exhaust hole on the cap of the injector is consistent with the direction of the central axis of the injector, so as to promote uniform release of gas into the fluid.
[0011] The utility model is further configured that a bottom cover is fixedly connected to one side of the injector, and the cross section of the bottom cover is a U-shaped cross section.
[0012] Through the above technical solution, the outer surface of the bottom cover of the injector is a smooth convex surface, or a convex annular ridge shape, which is used to separate the fluid.
[0013] The beneficial effects of the utility model are as follows:
[0014] The liquid to be floated flows in from the upstream end, after being accelerated at the neck end, is divided into a central fluid flowing out from the inner channel of the ejector and a circumferential fluid flowing out from the outer channel of the ejector at the throat part. As the passage area of the fluid is further reduced, the speed of the central fluid and the axial fluid is further increased, so that a relatively low pressure area is generated downstream of the ejector, which is conducive to the gas being ejected from the annular gas distribution chamber and mixed into the main flow of the fluid with a high speed, which helps to distribute the gas in the entire fluid and can better absorb any oil droplets in the water. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0016] Figure 2 It is a top view of the utility model;
[0017] Figure 3 for Figure 2 The outer surface of the middle bottom cover is an AA cross-sectional view of a smooth outer convex surface;
[0018] Figure 4 for Figure 2 The outer surface of the middle bottom cover is an AA cross-sectional view in the shape of an outwardly convex circular ridge;
[0019] Figure 5 for Figure 2 Middle BB section view.
[0020] In the figure: 1. Venturi tube; 11. upstream cylindrical section; 12. necking section; 13. throat; 14. conical diffusion section; 15. downstream cylindrical section; 2. air supply pipe; 3. ejector; 31. outer ring; 32. inner ring; 33. bottom cover; 34. top cover; 35. exhaust hole. DETAILED DESCRIPTION
[0021] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.
[0022] See also Figure 1-5 A venturi tube injection device comprises a venturi tube 1,
[0023] The venturi tube 1 includes an upstream cylindrical section 11, a necking section 12, a throat 13, a conical diffusion section 14 and a downstream cylindrical section 15 from upstream to downstream.
[0024] An ejector 3 is arranged inside the throat 13. The ejector 3 includes an outer ring 31 and an inner ring 32 which are concentrically nested. A bottom seal 33 is arranged in the upstream direction of the ejector 3 and connected between the inner ring 32 and the outer ring 31. A top seal 34 is arranged in the downstream direction of the ejector 3 and connected between the inner ring 32 and the outer ring 31. A plurality of exhaust holes 35 are provided on the top seal 34, so that after the fluid flows into the venturi tube 1 from the upstream, it is divided into two parts. One part flows out through the internal channel of the inner ring 32 (hereinafter referred to as the inner channel), and the other part bypasses the ejector 3 and flows out through the channel between the outer ring 31 and the throat 13 (hereinafter referred to as the outer channel).
[0025] The space between the outer ring 31 and the inner ring 32 of the ejector 3 constitutes an annular gas distribution chamber, one side of which is connected to a gas supply pipe 2, which runs through the venturi tube 1 and is used for external gas to flow into the annular gas distribution chamber of the ejector 3 and then be discharged through the exhaust hole 35 on the cap 34.
[0026] In this embodiment, the cross-sections of each section of the venturi tube 1 are circular, and the cross-sections of the outer ring 31 and the inner ring 32 of the ejector 3 are also circular. Of course, they can also be other shapes, such as elliptical, rectangular, etc.
[0027] The outer surface of the bottom cover 33 of the injector 3 is a smooth outer convex surface (such as Figure 3 ), or in the shape of a convex circular ridge (such as Figure 4 ) is used to separate the fluid. The design is such that the shape of the bottom cover 33 provides very small hydrodynamic resistance. The upstream fluid passes through the bottom cover 33 of the ejector 3 and can pass through the ejector 3 in a smooth laminar flow.
[0028] The outer surface of the cap 34 of the ejector 3 has a sharp edge. In this embodiment, it is a plane shape. Such a sharp edge causes the laminar flow to separate at the edge, forming a turbulent flow, thereby promoting the mixing of the gas mixed in the fluid.
[0029] The gas injection direction of the exhaust hole 35 on the cap 34 of the injector 3 is consistent with the direction of the central axis of the injector 3 to promote uniform release of gas into the fluid.
[0030] The plurality of exhaust holes 35 on the cap 34 are evenly distributed along the central axis of the injector 3. The exhaust holes 35 should be as small as possible and can be circular holes, rectangular holes, elliptical holes, etc., so as to form bubbles as fine as possible after the gas is ejected. However, smaller apertures are prone to clogging. Therefore, after testing, it is found that the diameter of each exhaust hole 35 should be ≥2mm, and a larger aperture reduces the pressure loss of the gas when it flows through the exhaust hole 35, so that the gas flow rate is larger. Therefore, the diameter of each exhaust hole 35 is in the range of 2 to 8mm, preferably 2 to 6mm, and more preferably 3 to 4mm; and the sum of the areas of the plurality of exhaust holes 35 (S 出 ) and the cross-sectional area of the inner wall of the gas supply pipe 2 (S 进 ), S 进 ≥S 出 Taking the above factors into consideration, in this embodiment, the single exhaust hole 35 is a circular hole with a diameter of 3 to 4 mm, which is substantially the same as that between . Such a design ensures low flow resistance and a balance between gas supply and consumption.
[0031] It should be noted that, if the exhaust hole 35 is a rectangular hole, the short side is parallel to the tangent direction of the cross section of the gas distribution chamber, and the symmetry axis of the long side is along a certain diameter direction of the injector 3.
[0032] In this embodiment, the cross section of the air supply pipe 2 is circular.
[0033] With such arrangement, the liquid to be floated flowing in from the upstream end is accelerated at the neck end and then divided at the throat 13 into a central fluid flowing out from the inner channel of the ejector 3 and a circumferential fluid flowing out from the outer channel of the ejector 3. Since the passage area of the fluid is further reduced, the speeds of the central fluid and the axial fluid are further increased, so that a relatively low pressure zone is generated downstream of the ejector 3, which is conducive to the gas being ejected from the annular gas distribution chamber and mixed into the main flow of the fluid with a high speed, which helps to distribute the gas in the entire fluid and can better absorb any oil droplets in the water.
[0034] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A venturi tube injection device, comprising a venturi tube (1), characterized in that: An ejector (3) is arranged inside the venturi tube (1), and an air supply pipeline (2) is fixedly connected to the ejector (3); The ejector (3) is provided with an outer ring (31) and an inner ring (32); A capping (34) is fixedly connected to one side of the injector (3), and a plurality of exhaust holes (35) are provided on the capping (34).
2. A venturi tube injection device according to claim 1, characterized in that: The venturi tube (1) comprises an upstream cylindrical section (11), a neck section (12), a throat section (13), a conical diffusion section (14) and a downstream cylindrical section (15); the upstream cylindrical section (11), the neck section (12), the throat section (13), the conical diffusion section (14) and the downstream cylindrical section (15) are all fixedly connected, and the air supply pipeline (2) passes through the throat section (13) of the venturi tube (1).
3. A venturi tube injection device according to claim 1, characterized in that: A bottom cover (33) is fixedly connected to one side of the injector (3), and the cross section of the bottom cover (33) is a U-shaped cross section.