Venturi mixer

Abstract

The utility model discloses a venturi mixer which comprises a main body, a contraction cavity, a throat pipe and a diffusion pipe, the contraction cavity is arranged in the left end of the main body and forms a gas inlet cavity with the main body, the contraction cavity is a hollow cone, an air inlet is formed in the middle of the contraction cavity, and a plurality of small holes are uniformly distributed in the surface of the contraction cavity; the throat pipe is arranged in the middle of the main body, the throat pipe is connected with the right end of the shrinkage cavity, and a waste gas cavity is formed between the throat pipe and the main body; the diffusion pipe is arranged in the right end of the main body, an extension pipe expanding outwards is arranged at the left end of the diffusion pipe, and the extension pipe extends out of the right portion of the throat pipe to form an air channel with the throat pipe. The blade type mixer solves the problems that an existing blade type mixer has a mixing efficiency bottleneck, and when the existing blade type mixer is applied to a large-displacement engine, the mixing efficiency is low, the air inflow is insufficient, and the optimal value required by the engine cannot be achieved.

Description

Technical Field

[0001] The utility model relates to the field of engines, and particularly to a Venturi mixer. Background Art

[0002] Based on the greater displacement requirements of gas engines, the larger the engine displacement, the greater the air intake, and the mixing efficiency of the mixer needs to be improved. The most commonly used in existing mixers is a vane type spoiler. This vane type spoiler forms a boundary layer effect through the front and rear vanes, and generates eddy currents by controlling the vanes to achieve the effect of mixing air, gas, and exhaust gas in a certain proportion. This effect has certain achievements in actual applications, but the vane type mixer has a bottleneck in mixing efficiency. When applied to large-displacement engines, there will be problems of low mixing efficiency and insufficient air intake, and the optimal value required by the engine cannot be achieved.

[0003] The disclosure of the above background art content is only used to assist in understanding the inventive concept and technical solution of the utility model, and it does not necessarily belong to the prior art of this patent application. Without clear evidence indicating that the above content was publicly available on the filing date of this patent application, the above background art should not be used to evaluate the novelty and inventiveness of this application. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a Venturi mixer to solve the problems of the existing vane type mixer having a bottleneck in mixing efficiency, low mixing efficiency, insufficient air intake, and inability to reach the optimal value required by the engine when applied to large-displacement engines.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A Venturi mixer, characterized in that it includes a main body, a contraction cavity, a throat tube, and a diffuser tube; the contraction cavity is arranged inside the left end of the main body and forms a gas intake cavity with the main body. The contraction cavity is a hollow cone, with an air intake port in the middle, and a number of small holes are evenly distributed on its surface; the throat tube is arranged in the middle of the main body, and the throat tube is connected to the right end of the contraction cavity, and an exhaust gas cavity is formed between the throat tube and the main body; the diffuser tube is arranged inside the right end of the main body, and an extended tube with an outward expansion is provided at the left end of the diffuser tube, and the extended tube extends outside the right part of the throat tube to form an air passage with the throat tube.

[0007] Further, a gas inlet pipe is provided outside the left part of the main body, and the gas inlet pipe is communicated with the gas intake cavity.

[0008] Further, an exhaust gas inlet is provided outside the middle part of the main body, and the exhaust gas inlet is communicated with the exhaust gas cavity.

[0009] Furthermore, the left end of the nozzle of the diffuser tube gradually expands from left to right.

[0010] Furthermore, the gas inlet cavity is connected to the air inlet and the throat through the small holes.

[0011] Furthermore, the exhaust gas cavity is connected to the throat and the diffuser tube through the air duct.

[0012] Furthermore, a pressure and temperature sensor is provided at the throat.

[0013] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0014] 1. A plurality of small hole structures are provided on the contraction cavity of the present utility model. The multiple small hole structures can cause more turbulence when gas or liquid passes through the small holes. Under the turbulence effect at low flow velocity in this cavity, the mixing efficiency of the gas and air can be significantly improved, and the gas-air mixture is transported towards the throat opening.

[0015] 2. The throat of the present utility model is arranged in the middle. The throat is the narrowest part of the entire Venturi mixer, where the fluid reaches the highest speed and the lowest pressure. Since the throat opening is at negative pressure and the exhaust gas inlet is at positive pressure, as gas always flows from the high-pressure area to the low-pressure area until pressure equilibrium, during this process, gas molecules will accelerate mixing and diffusion during the gas flow, making the gas gradually mix evenly.

[0016] 3. The diffuser tube of the present utility model is arranged at the tail and gradually expands starting from the throat, and finally returns to a diameter close to that of the inlet section. During this process, the fluid velocity gradually decreases, the pressure rises, the molecular density becomes smaller, and the degree of gas mixing becomes further higher.

[0017] 4. The present utility model solves the problem of the mixing efficiency bottleneck existing in the existing vane mixers. When applied to large-displacement engines, there will be problems such as low mixing efficiency, insufficient air intake, and inability to reach the optimal value required by the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a cross-sectional view of the present utility model;

[0020] Figure 3 is a top view of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described in detail below in conjunction with the specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present utility model.

[0022] As Figures 1 to 3 shown, a Venturi mixer is characterized by comprising a main body 1, a contraction cavity 2, a throat 3 and a diffuser tube 4; the contraction cavity 2 is arranged inside the left end of the main body 1 and forms a gas inlet cavity 5 with the main body 1, a gas inlet pipe 6 is arranged outside the left part of the main body 1, the gas inlet pipe 6 is communicated with the gas inlet cavity 5, the contraction cavity 2 is a hollow cone, the middle part is an air inlet 7, and a plurality of small holes 8 are evenly distributed on its surface. The gas inlet cavity 5 is communicated with the air inlet 7 and the throat 3 through the small holes 8. The structure of the multiple small holes 8 can make gas or liquid generate more turbulence when passing through the small holes 8; the throat 3 is arranged in the middle of the main body 1, a pressure and temperature sensor 9 is arranged at the throat 3 for providing real-time detection data to the ECU, the throat 3 is connected to the right end of the contraction cavity 2, and an exhaust gas cavity 10 is formed between the throat 3 and the main body 1. An exhaust gas inlet 11 is arranged outside the middle part of the main body 1, and the exhaust gas inlet 11 is communicated with the exhaust gas cavity 10. The throat 3 is the narrowest part of the entire Venturi mixer, and the fluid reaches the highest speed and the lowest pressure here. Since the throat is in negative pressure and the exhaust gas inlet 11 is in positive pressure, because gas always flows from the high-pressure area to the low-pressure area (throat) until the pressure is balanced. During this process, gas molecules will accelerate mixing and diffusion during the gas flow, making the gas gradually mix evenly; the diffuser tube 4 is arranged inside the right end of the main body 1, the pipe orifice of the diffuser tube 4 gradually expands from the left end to the right end, an extended tube 12 with an outward expansion is arranged at the left end of the diffuser tube 4, and the extended tube 12 extends to the outside of the right part of the throat 3 and forms an air passage 13 with the throat 3. The exhaust gas cavity 10 is communicated with the throat 3 and the diffuser tube 4 through the air passage 13. The diffuser tube 4 gradually expands from the throat and finally returns to a diameter close to that of the inlet section. During this process, the fluid velocity gradually decreases, the pressure rises, the molecular density becomes smaller, and the gas mixing degree becomes higher.

[0023] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several alternatives or modifications can be made to these described embodiments, and these alternative or modification methods should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A Venturi mixer, characterized in that: It includes a main body, a contraction cavity, a throat and a diffuser; the contraction cavity is arranged in the left end of the main body to form a gas intake cavity with the main body, the contraction cavity is a hollow cone, the middle part is an air intake port, and a plurality of small holes are evenly distributed on its surface; the throat is arranged in the middle part of the main body, the throat is connected to the right end of the contraction cavity, and an exhaust gas cavity is formed between the throat and the main body; the diffuser is arranged in the right end of the main body, and an outwardly expanded extension pipe is provided at the left end of the diffuser, and the extension pipe extends to the outside of the right part of the throat to form an airway with the throat.

2. A Venturi mixer according to claim 1, characterized in that: A gas inlet pipe is arranged outside the left part of the main body, and the gas inlet pipe is communicated with the gas inlet cavity.

3. A Venturi mixer according to claim 1, characterized in that: An exhaust gas inlet is arranged outside the middle of the main body, and the exhaust gas inlet is communicated with the exhaust gas cavity.

4. A Venturi mixer according to claim 1, characterized in that: The pipe opening of the diffusion pipe gradually expands from the left end to the right end.

5. A Venturi mixer according to claim 1, characterized in that: The gas intake cavity is connected with the air intake port and the throat through the small hole.

6. A Venturi mixer according to claim 1, characterized in that: The exhaust gas chamber is communicated with the throat pipe and the diffusion pipe through the air passage.

7. A Venturi mixer according to claim 1, characterized in that: A pressure and temperature sensor is provided at the throat.

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