Novel venturi structure mixer

Abstract

A novel venturi structure mixer comprises a reducing section, a throat section, a diverging section, a return pipe, an introduction pipe, a return chamber and an injection port, the reducing section, the throat section and the diverging section are sequentially connected in sequence, inner cavities of the reducing section, the throat section and the diverging section are communicated, the return chamber is connected with the reducing section and the throat section, the two ends of the return pipe are connected to the return chamber and the tail section of the diverging section respectively, and the return chamber and the tail section of the diverging section are communicated. The included angle between the injection port and the central axis of the mixer is smaller than 90 degrees, the injection port faces the flow direction of the medium, the introduction pipe is connected to the middle section of the return pipe, and the mixed secondary flow medium is introduced into the mixer. The trace medium is subjected to primary mixing on the return branch and then is subjected to secondary mixing, so that the mixing ratio of each stage of mixing is increased, and the overall mixing effect is enhanced.

Description

Technical Field

[0001] This utility model relates to a novel Venturi structure mixer, specifically a mixer that utilizes a Venturi structure to solve the problem of uneven mixing when one or more of the multiple fluids being mixed have a lower flow rate than the other fluids. Background Technology

[0002] A Venturi tube is a pipe that initially narrows and then gradually widens after passing through a throat. Because the fluid velocity increases and then decreases as it flows through the Venturi tube, the static pressure across the tube also changes. Therefore, Venturi tubes are often used as a device to measure fluid flow rate by utilizing the pressure difference across the tube.

[0003] Meanwhile, a mixer is a mixing device used to mix two or more media. In terms of structure, mixers can be divided into various types, but their basic principles are the same. In the process of fluid flow, several mixing units of specific shapes are set up. When the fluid flows through the mixing unit, it is guided by the mixing unit, and the flow direction and position change, producing effects such as separation, rotation, and collision, and finally achieving the mixing effect.

[0004] However, when conventional mixers are used in applications where one or more of the fluids being mixed have a relatively small flow rate compared to the others, the distribution of this trace medium within the other mixing media is not significantly affected by the disordered flow of the main stream, resulting in the desired mixing effect. Therefore, conventional mixers often produce poor mixing results for applications involving trace media. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a novel Venturi structure mixer to solve the problem of poor mixing effect when existing conventional mixers are used in micro-medium mixing conditions.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A novel Venturi structure mixer includes a converging section, a throat section, a diverging section, a return pipe, an inlet pipe, a return chamber, and an injection port. The converging section, throat section, and diverging section are sequentially connected and have interconnected cavities. The return chamber is connected to the converging section and the throat section. The two ends of the return pipe are respectively connected to the return chamber and the end of the diverging section, connecting the return chamber and the end of the diverging section. The injection port has an angle of less than 90° with the mixer's central axis and is oriented in the direction of the medium flow. The inlet pipe is connected to the middle section of the return pipe, introducing the secondary flow medium to be mixed into the mixer.

[0008] The number of return pipes is multiple, meaning that the fluid at the end of the diffuser section can be divided into multiple branches, which mix with the secondary flow medium in the inlet pipe before entering the middle section of the throat section.

[0009] The mixed secondary flow medium enters the return pipe through the inlet pipe, where it undergoes primary mixing with the return medium in the middle section of the return pipe and the return chamber, forming a primary mixed medium. Then, it undergoes secondary mixing with the mainstream medium in the middle section of the throat.

[0010] This invention employs a Venturi structure, utilizing the pressure difference before and after fluid flow through the Venturi tube. A return branch is established between the high and low static pressure points, where trace amounts of medium undergo primary mixing, followed by secondary mixing. This increases the mixing ratio at each stage, thereby enhancing the overall mixing effect.

[0011] This invention achieves better mixing results based on a relatively simple structure, facilitating manufacturing. It also boasts strong adaptability, suitable for various working conditions and media, making it suitable for widespread promotion and application. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the mixer described in this utility model;

[0013] Figure 2 This is a schematic diagram illustrating the working principle of this utility model;

[0014] Figure 3 This is a schematic diagram of another embodiment of the mixer described in this utility model;

[0015] In the diagram: 01, converging section; 02, throat section; 03, expanding section; 04, return pipe; 05, inlet pipe; 06, return chamber; 07, injection port; 21, main flow medium; 22, secondary flow medium; 23, return medium; 24, primary mixing medium. Detailed Implementation

[0016] The present invention can be explained in more detail through the following embodiments, but the present invention is not limited to the following embodiments;

[0017] First, it should be noted that the orientations or positional relationships indicated by terms such as "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer" used in describing the structure of this utility model are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing and simplifying this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Combined with appendix Figure 1 Appendix Figure 2 A novel Venturi structure mixer includes a converging section 01, a throat section 02, a diffusing section 03, a return pipe 04, an inlet pipe 05, a return chamber 06, an injection port 07, and a mixing chamber 08. The converging section 01, throat section 02, diffusing section 03, and mixing chamber 08 are sequentially connected and their internal cavities are interconnected. The return chamber 06 is connected to the converging section 01 and the throat section 02. The two ends of the return pipe 04 are respectively connected to the return chamber 06 and the end of the diffusing section 03, connecting the return chamber 06 and the end of the diffusing section 03. The injection port 07 has an angle of less than 90° with the central axis of the mixer and is oriented in the direction of medium flow. The inlet pipe 05 is connected to the middle section of the return pipe 04, introducing the mixed secondary flow medium 22 into the mixer.

[0019] The number of return pipes 04 is multiple, meaning that the fluid at the end of the gradually expanding section 03 can be divided into multiple branches, which mix with the secondary flow medium 22 in the inlet pipe 05 before entering the middle section of the throat section 02.

[0020] Secondary flow medium 22 enters return pipe 04 through inlet pipe 05. In the middle section of return pipe 04 and return chamber 06, it undergoes primary mixing with return medium 23 to form primary mixed medium 24. Then, in the middle section of throat section 02, it undergoes secondary mixing with mainstream medium 21.

[0021] Combined with appendix Figure 1 The novel Venturi structure mixer is designed to mix the main flow medium 21 and the secondary flow medium 22. Since the flow rate of the secondary flow medium 22 is relatively small compared to that of the main flow medium 21, the direct mixing effect is poor. Therefore, a special mixing method is required.

[0022] When the mixer described in this invention is in operation, the main medium 21 enters the mixer from the converging section 01 and passes through the converging section 01, the throat section 02, and the expanding section 03 under upstream pressure. Since the converging section 01, the throat section 02, and the expanding section 03 are sequentially connected and their internal cavities are interconnected to form a Venturi structure, the flow velocity of the main medium 21 increases and the static pressure decreases in the throat section 02, while the flow velocity decreases and the static pressure decreases in the expanding section 03, thus creating a pressure difference between the throat section 02 and the expanding section 03. Simultaneously, this invention provides a return pipe 04 and a return chamber 05 between the throat section 02 and the expanding section 03, utilizing the pressure difference to create a backflow between them. Then, an inlet pipe 05 is connected to the middle section of the return pipe 04 to mix the secondary flow medium 22 with the return medium 23, forming a primary mixed medium 24. Because the return medium 23 has a smaller proportion than the mainstream medium 21, the mixing ratio of the secondary flow medium 22 with the return medium 23 is significantly higher than that with the secondary flow medium 21, thus achieving a better mixing effect. The resulting primary mixed medium 24 then flows back through the return pipe 04 and return chamber 05 to the middle section of the throat section 02, where it undergoes secondary mixing with the mainstream medium 21, further improving the mixing effect. The mixed fluid then flows out of the mixer described in this invention from the diffuser section 03.

[0023] Appendix Figure 3 In another embodiment of this utility model, in practical applications, a plurality of return pipes 04 are set according to the flow rate of the mainstream medium 21. Each return pipe 04 is provided with an independent inlet pipe 05. On each branch of the return pipe 04, the secondary flow medium 22 and the return medium 23 are mixed in the first stage, and then the flow returns to the middle section of the throat section 02. In the middle section of the throat section 02, a second stage of mixing occurs with the mainstream medium 21, which further improves the mixing effect. This technical solution is also within the protection scope of this utility model.

[0024] This utility model has the following advantages:

[0025] 1. This utility model changes the original direct mixing to two-stage mixing. Because the mixing ratio is reduced, the mixing effect will be significantly improved.

[0026] 2. This utility model achieves a better mixing effect on a relatively simple structure, which is convenient for mass production.

[0027] 3. This utility model can be configured with different numbers of return pipes according to actual operating conditions to adjust the reflux ratio and mixing ratio. At the same time, when the secondary flow medium changes and the injection volume needs to be adjusted, this utility model can also make corresponding adjustments as needed.

[0028] The parts of this utility model not described in detail are existing technologies.

[0029] The above embodiments illustrate one, but not all, implementations of this utility model. The scope of protection of this utility model is not limited to the following implementations; all equivalent changes or substitutions made based on the technical principles and spirit of this utility model are within its protection scope. The purpose of disclosing this utility model is to protect all technical improvements within it. All other implementations obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A novel Venturi structure mixer, comprising a tapering section (01), a throat section (02), a diffusing section (03), a return pipe (04), an inlet pipe (05), a return chamber (06), and an injection port (07), characterized in that: The converging section (01), throat section (02), and expanding section (03) are connected in sequence and their inner cavities are interconnected. The return chamber (06) is connected to the converging section (01) and throat section (02). The two ends of the return pipe (04) are connected to the return chamber (06) and the end of the expanding section (03) respectively, connecting the return chamber (06) and the end of the expanding section (03). The injection port (07) has an angle of less than 90° with the central axis of the mixer and is oriented in the direction of medium flow. The inlet pipe (05) is connected to the middle section of the return pipe (04) to introduce the mixed secondary flow medium (22) into the mixer.

2. The mixer according to claim 1, characterized in that: The number of return pipes (04) is multiple, that is, the fluid at the end of the gradually expanding section (03) can be divided into multiple branches, which mix with the secondary flow medium (22) in the inlet pipe (05) and then enter the middle section of the throat section (02).

3. The mixer according to claim 1, characterized in that: The mixed secondary flow medium (22) enters the return pipe (04) through the inlet pipe (05), and undergoes primary mixing with the return medium (23) in the middle section of the return pipe (04) and the return chamber (06), and then forms a primary mixed medium (24), which then undergoes secondary mixing with the mainstream medium (21) in the middle section of the throat section (02).

Images