Mixing cavity for nitrogen oxide treatment device

Abstract

The utility model relates to the technical field of waste gas treatment, in particular to a mixing cavity for a nitrogen oxide treatment device, which comprises a pipe body, one end of the pipe body is a gas inlet, the other end of the pipe body is a gas outlet, a mixer shell is arranged in the pipe body, and one end of the mixer shell is provided with an opening facing the gas outlet. An annular blocking piece is connected to the edge of an opening of the mixer shell, the outer vertical face of the annular blocking piece makes contact with the inner wall of the pipe body in a sealed mode, a plurality of blades arranged in the tangential direction are arranged on the mixer shell, and air inlet holes and spraying holes are formed in the projection positions of the blades on the outer wall of the mixer shell respectively. Due to the fact that the mixer shell is connected with the blades arranged in the tangential direction, waste gas can enter the gas inlet holes along the blades in the tangential direction, the sprayer sprays a solution into the spraying holes along the blades, the waste gas and spraying liquid enter the mixer shell in the tangential direction to generate vortexes, and the waste gas and the spraying liquid are fully and evenly mixed to react.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a mixing chamber for a nitrogen oxide treatment device. Background Art

[0002] The catalyst unit for the exhaust gas catalyst has a plurality of catalyst modules. Each catalyst module has a ceramic catalyst body through which the exhaust gas flows and a metal shell with a rectangular cross section, which is used for the ceramic catalyst body, wherein the shell is also referred to as a can. Under the increasingly stringent emission and fuel consumption standards, as well as the requirements for engine miniaturization and lightweighting, the exhaust after-treatment system should also be improved accordingly, such as adding an engine exhaust gas recirculation system, but this reduces the temperature of the engine, part of the fuel is not fully burned, and the emission of unburned hydrocarbons and particulate matter increases. Therefore, under the increasingly stringent emission and fuel consumption standards, as well as the requirements for engine miniaturization and lightweighting, the exhaust gas treatment system must also be improved accordingly to meet government regulations, such as setting a mixer to reduce nitrogen oxide emissions to treat nitrogen oxides;

[0003] The mixer is generally located at the outlet of the DOC or downstream of the DPF and upstream of the inlet of the SCR. The exhaust gas enters the mixer, and the injector is used to spray the urea aqueous solution from the upstream of the SCR into the exhaust gas flow so that the mixer can fully and evenly mix the urea and the exhaust gas together and discharge them to the SCR for reduction reaction to generate nitrogen and water to reduce the nitrogen oxide emission of the engine. However, there is still room for improvement in the existing mixer, such as the need to further improve the uniformity of the mixing of the exhaust gas and the spray liquid. Utility Model Content

[0004] The purpose of the utility model is to provide a mixing chamber for a nitrogen oxide treatment device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a mixing chamber for a nitrogen oxide treatment device, comprising a tube body, one end of the tube body being an air inlet, and the other end being an exhaust port, a mixer shell being arranged inside the tube body, one end of the mixer shell having an opening and the opening facing the exhaust port, an annular baffle being connected to the opening edge of the mixer shell, the outer facade of the annular baffle being in contact and sealed with the inner wall of the tube body, a plurality of blades arranged along a tangential direction being arranged on the mixer shell, and air inlet holes and spray holes are respectively opened at the projections of the blades on the outer wall of the mixer shell.

[0006] By adopting the above technical solution: one end of the tube body is used for air intake, and the other end is used for air outlet, and a mixer shell and an annular baffle are provided in the tube body. When the exhaust gas enters the exhaust port, it will stay on one side of the air inlet in the tube body due to the obstruction of the mixer shell and the annular baffle, and a plurality of tangentially arranged blades are connected to the mixer shell, and the exhaust gas can enter the air inlet tangentially along the blades, and the sprayer sprays the solution into the spray hole along the blades, and the exhaust gas and the spray liquid both enter the mixer shell tangentially to generate vortexes, so that the exhaust gas and the spray liquid are fully and evenly mixed to react.

[0007] The side wall of the tube body is provided with a mounting groove for mounting the sprayer, the spray hole corresponds to the spray hole, and one end of the sprayer extends into the spray hole.

[0008] By adopting the above technical solution: the installation groove is used to install the sprayer and one end of the sprayer can be extended into the spray hole so as to add the spray liquid into the mixer shell.

[0009] An installation hole for installing a temperature sensor and a gas sampler is provided at one end of the tube body close to the exhaust port.

[0010] By adopting the above technical solution: a temperature sensor and a gas sampler are installed at the air inlet of the tube body to detect the temperature and composition of the gas.

[0011] A mesh plate is provided on the inner side of the tube body near the exhaust port, and the mesh plate has exhaust holes of the same size and evenly distributed.

[0012] By adopting the above technical solution: the mesh plate is evenly provided with air outlet holes of the same size for even air outlet.

[0013] Four groups of blades are evenly arranged on the mixer housing, and the length of the blades close to the spray holes is longer than that of the other blades.

[0014] By adopting the above technical solution: the blades close to the spray holes allow the spray liquid to enter the mixer housing tangentially along the spray holes, and at the same time, more exhaust gas can form vortices better on the mixer housing.

[0015] Technical effects and advantages of the utility model:

[0016] 1. In this scheme, one end of the tube body is used for air intake, and the other end is used for air outlet. A mixer shell and an annular baffle are provided in the tube body. When the exhaust gas enters the exhaust port, it will stay on one side of the air inlet in the tube body due to the obstruction of the mixer shell and the annular baffle. A plurality of tangentially arranged blades are connected to the mixer shell. The exhaust gas can enter the air inlet tangentially along the blades, and the sprayer sprays the solution into the spray hole along the blades. Both the exhaust gas and the spray liquid enter the mixer shell tangentially to generate vortexes, so that the exhaust gas and the spray liquid are fully and evenly mixed and reacted.

[0017] 2. In this solution, the mounting groove is used to mount the sprayer and one end of the sprayer can extend into the spray hole so as to add spray liquid into the mixer housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the mixer housing in the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the mesh plate in the utility model;

[0021] Figure 4 It is a structural schematic diagram of the annular baffle in the utility model;

[0022] Figure numerals: 1, tube body; 101, mounting groove; 102, mounting hole; 2, mixer housing; 201, spray hole; 202, air inlet; 3, blade; 4, annular baffle; 5, mesh plate; 501, air outlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example

[0025] This embodiment has the following features: Figure 1 The mixing chamber for the nitrogen oxide treatment device shown in the figure comprises a pipe body 1, one end of the pipe body 1 is an air inlet, and the other end is an exhaust port. A mixer housing 2 is arranged in the pipe body 1, one end of the mixer housing 2 has an opening and the opening faces the exhaust port. An annular baffle 4 is connected to the opening edge of the mixer housing 2, and the outer surface of the annular baffle 4 contacts and seals with the inner wall of the pipe body 1, as shown in FIG. Figure 2 As shown, a plurality of blades 3 arranged along a tangential direction are provided on the mixer housing 2 , and an air inlet hole 202 and a spray hole 201 are respectively opened at the projection of the blades 3 on the outer wall of the mixer housing 2 .

[0026] Furthermore, one end of the tube body 1 is used for air intake, and the other end is used for air outlet. A mixer shell 2 and an annular baffle 4 are provided inside the tube body 1. When the exhaust gas enters the exhaust port, it will stay on one side of the air inlet in the tube body 1 due to the obstruction of the mixer shell 2 and the annular baffle 4. A plurality of tangentially arranged blades 3 are connected to the mixer shell 2. The exhaust gas can enter the air inlet 202 tangentially along the blades 3, and the sprayer sprays the solution along the blades 3 into the spray hole 201. Both the exhaust gas and the spray liquid enter the mixer shell 22 tangentially to generate vortices, so that the exhaust gas and the spray liquid are fully and evenly mixed and reacted.

[0027] A mounting groove 101 for installing a sprayer is provided on the side wall of the tube body 1, and a spray hole 201 corresponds to the spray hole 201. One end of the sprayer extends into the spray hole 201. The mounting groove 101 is used to install the sprayer and one end of the sprayer can extend into the spray hole 201 so as to add spray liquid into the mixer housing 2; in addition, a mounting hole 102 for installing a temperature sensor and a gas sampler is provided at one end of the tube body 1 close to the exhaust port, and a temperature sensor and a gas sampler are installed at the air inlet of the tube body 1 for detecting the temperature and composition of the gas.

[0028] like Figure 3 As shown, a mesh plate 5 is provided on the inner side of the tube body 1 near the exhaust port, and the mesh plate 5 has air outlet holes 501 of the same size and evenly distributed. By evenly arranging the air outlet holes 501 of the same size, it is ensured that the spray liquid and the exhaust gas are fully mixed and evenly discharged.

[0029] Furthermore, four groups of blades 3 are evenly arranged on the mixer housing 2, and the length of the blades 3 close to the spray hole 201 is longer than that of other blades 3. The blades 3 close to the spray hole 201 allow the spray liquid to enter the mixer housing 22 tangentially along the spray hole 201, while allowing the exhaust gas to better form vortices on the mixer housing 2.

[0030] Specific implementation process: negative pressure is set at the exhaust port end of the tube body 1. At this time, the exhaust gas is sucked into the tube body 1 from the air inlet of the tube body 1. The exhaust gas passes through the tangentially arranged blades 3 to form a vortex and enters the mixer housing 22 from the air inlet hole 202. At the same time, the sprayer sprays the solution into the mixer through the spray hole 201. Figure 4 As shown, due to the presence of the tangentially arranged blades 3, the spray liquid also enters the mixer housing 22 tangentially along the blades 3. At this time, a vortex is formed in the mixer housing 22 to fully mix the spray liquid and the exhaust gas, thereby effectively improving the uniformity of the mixing of the exhaust gas and the spray liquid. The evenly mixed exhaust gas is evenly discharged through the outlet holes 501 on the mesh plate 5.

[0031] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mixing chamber for a nitrogen oxide treatment device, comprising a tube body (1), one end of the tube body (1) being an air inlet and the other end being an air outlet, characterized in that: A mixer housing (2) is provided in the pipe body (1), one end of the mixer housing (2) has an opening and the opening faces the exhaust port, an annular baffle (4) is connected to the edge of the opening of the mixer housing (2), the outer surface of the annular baffle (4) is in contact and sealed with the inner wall of the pipe body (1), a plurality of blades (3) arranged in a tangential direction are provided on the mixer housing (2), and an air inlet hole (202) and a spray hole (201) are respectively provided at the projection of the blades (3) on the outer wall of the mixer housing (2).

2. A mixing chamber for a nitrogen oxide treatment device as claimed in claim 1, characterized in that: A mounting groove (101) for mounting a sprayer is provided on the side wall of the tube body (1), the spray hole (201) corresponds to the mounting groove (101), and one end of the sprayer extends into the spray hole (201).

3. A mixing chamber for a nitrogen oxide treatment device as claimed in claim 2, characterized in that: An installation hole (102) for installing a temperature sensor and a gas sampler is provided at one end of the tube body (1) close to the exhaust port.

4. A mixing chamber for a nitrogen oxide treatment device as claimed in claim 3, characterized in that: A mesh plate (5) is provided on the inner side of the tube body (1) close to the exhaust port, and the mesh plate (5) has exhaust holes (501) of the same size and evenly distributed.

5. A mixing chamber for a nitrogen oxide treatment device according to any one of claims 1 to 4, characterized in that: Four groups of blades (3) are evenly arranged on the mixer housing (2), and the length of the blades (3) close to the spray hole (201) is longer than the lengths of the other blades (3).

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