Small-displacement urea mixer for passenger car

Abstract

The small-displacement urea mixer of the passenger car comprises a mixer cylinder, a rotational flow plate, a flow guide plate, a front baffle, a rotational flow piece and a rear baffle, the rotational flow plate, the flow guide plate, the front baffle, the rotational flow piece and the rear baffle are sequentially arranged in the mixer cylinder, the rotational flow plate is an air inlet end and communicated with the rear end of an oxidation catalyst, and center holes are formed in the centers of the rotational flow plate, the front baffle and the rear baffle. The flow guide plate is of a cylinder structure with a notch and a plurality of through holes which are formed in a transversely and longitudinally staggered mode, the two ends of the flow guide plate are fixed and communicated to a center hole of the front baffle and a center hole of the rotational flow plate respectively, a urea nozzle is arranged on the mixer cylinder, and atomized urea sprayed by the urea nozzle is sprayed into the mixer cylinder from the notch of the flow guide plate. The plurality of swirl plates are arc-shaped, are distributed in a central rotating state and are fixedly communicated to the rear baffle and the front baffle, and the rear baffle is an air outlet end and is communicated to the front end of the SCR carrier. The urea mixer can uniformly mix urea, reduces the crystallization risk, and is economical in cost and convenient to install and weld.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen energy vehicle exhaust after-treatment, and more specifically, to a small-displacement urea mixer for passenger vehicles. Background Art

[0002] Hydrogen energy, the latest clean energy technology, has become widespread in passenger vehicles. Due to the inherent characteristics of hydrogen engines, the high temperatures generated during hydrogen combustion cause nitrogen in the air to react with oxygen, producing nitrogen oxides. Hydrogen vehicles must also meet China VI emission standards, placing stringent requirements on exhaust purification. SCR technology remains an effective method for reducing nitrogen oxide (NOx) levels in vehicle exhaust and is adopted by the vast majority of manufacturers. The urea injection system involved in the SCR technology is a key component. Urea solution is injected into the exhaust purification system via a urea pump, atomized and converted into ammonia by a mixer. The ammonia reacts with NOx under the action of the SCR catalyst to produce nitrogen and water. Conventional mixers in hydrogen passenger vehicles are difficult to design, install, disassemble, and maintain due to the confined space. This necessitates a novel mixer, and the device designed in this application fully meets these constraints. Utility Model Content

[0003] One purpose of the utility model is to provide a small-displacement urea mixer for passenger cars, which can mix urea evenly while reducing the risk of crystallization, is cost-effective, and is easy to install and weld.

[0004] In order to solve the above technical problems, the utility model provides a small-displacement urea mixer for passenger cars, comprising a mixer cylinder and a swirl plate, a guide plate, a front baffle, a swirl sheet, and a rear baffle sequentially arranged in the mixer cylinder, wherein the swirl plate is an air inlet end and is connected to the rear end of the oxidation catalyst, the swirl plate, the front baffle, and the rear baffle are arranged in parallel and spaced apart, and their cross sections all cover the entire mixer cylinder and are fixed, the swirl plate, the front baffle, and the rear baffle have a center hole in their centers, the guide plate is a cylinder structure with a notch and a plurality of through holes arranged in a horizontal and vertical staggered manner, the two ends of the guide plate are respectively fixed and connected to the center hole of the front baffle and the center hole of the swirl plate, a urea nozzle is provided on the mixer cylinder, and the mist urea sprayed therefrom is sprayed into the notch of the guide plate, the swirl sheet is arc-shaped and is provided in plurality, the plurality of swirl sheets are distributed in a centrally rotating state and are fixedly connected to the rear baffle and the front baffle, and the rear baffle is an air outlet end and is connected to the front end of the SCR carrier.

[0005] Preferably, a plurality of guide blades are circumferentially spaced apart on the swirl plate, and an opening is provided on the swirl plate corresponding to each guide blade. Gas enters through the plurality of guide blades to form an airflow, and circulates around the guide plate.

[0006] Preferably, a distributor is provided at the rear end of the rear baffle in parallel with the rear baffle, a center hole is also provided at the center thereof, and the distributor is provided with a plurality of through holes that are annular and longitudinally spaced apart.

[0007] Preferably, the number of swirl blades is 2-6.

[0008] Preferably, the portion of the swirl blades facing the center of the mixer cylinder forms a porous plate structure that is staggered horizontally and vertically.

[0009] Preferably, the central axes of the swirl plate, the guide plate, the front baffle, the multiple swirl plates, the rear baffle, and the distributor all coincide with the central axis of the mixer barrel.

[0010] The utility model has at least the following beneficial effects:

[0011] 1. The utility model can mix urea evenly through the reasonable arrangement and distribution of the swirl plate, guide plate, front baffle, multiple swirl plates, rear baffle and distributor structures, and perfectly solves the problem of crystallization caused by contact between urea and the wall of the metal mixer cylinder.

[0012] 2. The entire device of the utility model has a compact structure and a small overall width. At the same time, by hooking the mixer outside, it solves the problem of convenient installation and disassembly maintenance under the narrow space conditions on hydrogen energy vehicles.

[0013] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is an exploded view of the overall structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the swirl plate of the utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the swirl blade of the utility model;

[0018] Figure 5 This is a schematic structural diagram of the guide plate of the utility model;

[0019] Figure 6 This is a schematic structural diagram of the rear baffle of the present invention;

[0020] Figure 7 This is a schematic structural diagram of the dispenser of the utility model.

[0021] Description of reference numerals:

[0022] 1. Swirl plate, 2. Guide plate, 3. Urea nozzle, 4. Front baffle, 5. Swirl plate, 6. Rear baffle, 7. Distributor, 8. Mixer cylinder. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below with reference to the accompanying drawings so that those skilled in the art can implement it according to the description.

[0024] It should be noted that, in the description of the present invention, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply 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 a limitation on the present invention.

[0025] like Figures 1 to 7 As shown, the utility model provides a small-displacement urea mixer for passenger cars, comprising a mixer cylinder 8 and a swirl plate 1, a guide plate 2, a front baffle 4, a swirl sheet 5, and a rear baffle 6 sequentially arranged in the mixer cylinder. The swirl plate is an air inlet end and is connected to the rear end of the oxidation catalyst. The swirl plate, the front baffle, and the rear baffle are arranged in parallel and spaced apart, and their cross sections all cover the entire mixer cylinder and are fixed. The swirl plate, the front baffle, and the rear baffle have a center hole in their centers. The guide plate is a cylinder structure with a notch and a plurality of through holes arranged in a horizontal and vertical staggered manner. Both ends of the guide plate are respectively fixed and connected to the center hole of the front baffle and the center hole of the swirl plate. A urea nozzle 3 is provided on the mixer cylinder, and the mist urea sprayed therefrom is sprayed into the notch of the guide plate. The swirl sheet is arc-shaped and multiple sheets are provided. The multiple swirl sheets are distributed in a centrally rotating state and are fixedly connected to the rear baffle and the front baffle. The rear baffle is an air outlet end and is connected to the front end of the SCR carrier.

[0026] The swirl plate is circumferentially spaced with multiple guide vanes. Each guide vane has an opening. Gas enters through the guide vanes, forming an airflow that circulates around the guide vanes, thus preventing urea from crystallizing due to contact with the metal mixer cylinder wall.

[0027] A distributor 7 is provided at the rear end of the tailgate, parallel to the tailgate, and has a central hole in its center. The distributor is provided with a plurality of through holes spaced longitudinally in an annular pattern. The configuration of the distributor ensures that the ammonia and exhaust gases are mixed evenly and the gas flow rate is evenly distributed.

[0028] The swirl blades are provided in 2-6 pieces. The portion of the swirl blades facing the center of the mixer cylinder forms a porous plate structure arranged in a horizontal and vertical staggered manner, so that the urea particles are fully broken in the high-speed airflow and the urea is fully hydrolyzed.

[0029] The central axes of the swirl plate, the guide plate, the front baffle, the multiple swirl plates, the rear baffle, and the distributor all coincide with the central axis of the mixer barrel.

[0030] The air inlet of the urea mixer device of the present application is at the rear end of the pre-oxidation catalyst (OC) of the hydrogen energy after-treatment system, and the air outlet is at the front end of the SCR carrier. After the automobile exhaust passes through the OC, the airflow enters the mixer cylinder along the pre-swirl plate. The airflow entering from a circle of guide blades arranged on the swirl plate forms a circular flow that wraps around the guide plate. At the same time, the urea solution is sprayed out through the urea nozzle installed on the top nozzle holder. The mist urea sprayed out by the nozzle is mixed with the airflow entering from the pre-swirl plate inside the guide plate. The urea solution is wrapped by the circulating gas entering from the pre-swirl plate inside the guide plate, avoiding contact with the inner wall surface of the mixer cylinder. The mixed airflow enters the post-swirl plate system along the center hole of the front baffle. The number of swirl plates ranges from 2 to 6, forming a uniformly mixed airflow that passes through the rear baffle and enters the distributor. During the entire flow process, it does not contact the metal mixer cylinder wall at all. At the same time, a porous plate structure is installed in the upper middle portion of the rear swirl vane to fully break up urea granules in the high-speed airflow, allowing for complete hydrolysis of the urea. During the mixing process, the urea undergoes a chemical reaction and hydrolyzes into ammonia. After mixing with the vehicle exhaust and exiting through the rear tailgate, it passes through a distributor at the mixer outlet, achieving uniform mixing of the ammonia and exhaust gases and uniform gas flow velocity distribution. This entire structure perfectly eliminates the problem of urea crystallization caused by contact with the metal mixer cylinder wall. The entire device is compact and has a small overall width. Furthermore, the hook connection on the outside of the mixer facilitates installation and disassembly for maintenance in the narrow and long spaces of hydrogen-powered vehicles.

[0031] It is understood that the present invention is described through some embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and implementation methods. They can be applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A small displacement urea mixer for passenger cars, characterized in that: The mixer comprises a cylinder body and a swirl plate, a guide plate, a front baffle, a swirl sheet and a rear baffle which are sequentially arranged in the cylinder body. The swirl plate is the air inlet end and is connected to the rear end of the oxidation catalyst. The swirl plate, the front baffle and the rear baffle are arranged in parallel and spaced apart and their cross sections cover the entire cylinder body of the mixer and are fixed. The swirl plate, the front baffle and the rear baffle have a central hole in the center. The guide plate is a cylinder structure with a notch and a plurality of through holes arranged in a horizontal and vertical staggered manner. The two ends of the guide plate are respectively fixed and connected to the central hole of the front baffle and the central hole of the swirl plate. A urea nozzle is provided on the mixer cylinder, and the mist urea sprayed therefrom is sprayed into the notch of the guide plate. The swirl sheet is arc-shaped and multiple sheets are provided. The multiple swirl sheets are distributed in a central rotating state and are fixedly connected to the rear baffle and the front baffle. The rear baffle is the air outlet end and is connected to the front end of the SCR carrier.

2. The small-displacement urea mixer for passenger cars according to claim 1, characterized in that: The swirl plate is provided with a plurality of guide blades at intervals in an annular direction. An opening is provided on the swirl plate corresponding to each guide blade. Gas enters through the plurality of guide blades to form an airflow, and circulates to wrap around the guide plate.

3. The small-displacement urea mixer for passenger cars according to claim 1, characterized in that: A distributor is provided at the rear end of the rear baffle in parallel with the rear baffle, and a center hole is also provided at the center of the distributor. A plurality of through holes are provided on the distributor in an annular manner and are spaced apart longitudinally.

4. The small-displacement urea mixer for passenger cars according to claim 1, characterized in that: The swirl sheets are provided in 2-6 pieces.

5. The small-displacement urea mixer for passenger vehicles according to claim 1, characterized in that: The portion of the swirl blades facing the center of the mixer barrel forms a porous plate structure that is staggered horizontally and vertically.

6. The small-displacement urea mixer for passenger vehicles according to claim 3, characterized in that: The central axes of the swirl plate, the guide plate, the front baffle, the multiple swirl plates, the rear baffle, and the distributor all coincide with the central axis of the mixer barrel.

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