Engine urea mixer

Abstract

The present invention discloses an engine urea mixer, which belongs to the technical field of engine exhaust post-treatment devices, and solves the problem that there is no mechanical structure inside the existing urea mixer that can promote the mixing of urea and exhaust gas, resulting in poor mixing effect. The mixer includes a sleeve, a mixing tube is vertically inserted in the sleeve, a baffle is provided between the mixing tube and the sleeve to connect the two to separate the sleeve into an air inlet port and an air outlet port, a plurality of vents are provided on the upper periphery of the mixing tube to connect the air inlet port and the air outlet port, and each vent is provided with an inclined plate arranged outwardly on one side, and a spoiler connected to the inner wall of the sleeve is also provided in the sleeve on one side of the air outlet port; the top of the mixing tube is connected to a nozzle seat for installing a nozzle through a cover plate. The mixer of the present invention is applied to exhaust post-treatment, so that the reducing agent and the engine exhaust are fully and evenly mixed, and the structural layout of the diesel engine post-treatment system is reasonably optimized.

Description

Technical Field

[0001] The invention relates to the technical field of engine exhaust after-treatment devices, and more specifically, to an engine urea mixer. Background Art

[0002] Currently, diesel engines emit NO x The post-treatment system uses selective reduction (SCR). The working principle of this system is to spray the reducing agent (urea solution with a concentration of 32.5%) into the engine exhaust pipe, and the urea is decomposed into NH3, NH3 and NO by heat. x The reaction inside the SCR catalyst generates N2 and water, thereby achieving the purpose of reducing engine NOx emissions. The mixer plays a vital role in the entire system, determining the mixing effect of urea and exhaust gas, thereby affecting the performance of the entire system.

[0003] Most existing urea mixers are straight long tubes, and there is no mechanical structure inside the mixer to promote the mixing of urea and tail gas. Although such mixers have a simple structure, the mixing effect is very poor.

[0004] Existing mixers have the following disadvantages:

[0005] 1. Since there is no structure that can promote the mixing of urea and exhaust gas, the entire injection system has higher requirements on the atomization ability of the nozzle, which makes the manufacturing difficulty of the nozzle greater and increases the manufacturing cost of the nozzle;

[0006] 2. In order to make the mixing time of urea and tail gas fully mixed, the length of the mixer will be designed to be very long. Moreover, since urea is highly corrosive, the material of the mixing tube needs to be stainless steel with high corrosion resistance, which results in large consumables of the mixer, high cost, and larger system volume;

[0007] 3. Since the mixer is a straight long tube, the exhaust gas in the mixer flows very slowly, and the exhaust gas easily forms crystals on the surface of the urea nozzle or the inner wall of the mixing tube, causing pipeline blockage. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide an engine urea mixer for use in exhaust gas aftertreatment, so that the reducing agent and the engine exhaust are fully and evenly mixed, and the structural layout of the diesel engine aftertreatment system is reasonably optimized.

[0009] The technical solution adopted by the present invention is: an engine urea mixer, comprising a sleeve, a mixing tube is vertically inserted in the sleeve, a baffle is provided between the mixing tube and the sleeve to connect the two so as to separate the sleeve into an air inlet port and an air outlet port, a plurality of vents are provided on the periphery of the upper part of the mixing tube to connect the air inlet port and the air outlet port, an inclined plate arranged outwardly is provided on one side of each of the vents, a spoiler connected to the inner wall of the sleeve is also provided in the sleeve on the side of the air outlet port; a nozzle seat for mounting a nozzle is connected to the top of the mixing tube through a cover plate.

[0010] As a further improvement, the baffle includes a first baffle, a second baffle and a third baffle, the second baffle is horizontally installed on the middle periphery of the mixing tube, the first baffle and the third baffle are vertically arranged, and the top of the first baffle is connected to the second baffle, the lower periphery of the first baffle is connected to the inner wall of the sleeve, the bottom of the third baffle is connected to the second baffle, and the lower periphery of the third baffle is connected to the inner wall of the sleeve.

[0011] Furthermore, the first spoiler is a U-shaped plate with a middle portion protruding toward the air inlet port, and correspondingly, the third spoiler is a U-shaped plate with a middle portion recessed toward the air outlet port.

[0012] Furthermore, a steel wool ball is provided at the bottom of the mixing tube.

[0013] Furthermore, an air collecting groove is provided at the center of the spoiler, and a plurality of air outlet holes are opened in the air collecting groove.

[0014] Furthermore, a plurality of spoiler grooves are evenly arranged on the spoiler plate outside the air collecting groove.

[0015] Furthermore, the vent hole is a long hole extending along the axial direction of the mixing tube, and correspondingly, the inclined plate is a long plate extending along the axial direction of the mixing tube.

[0016] Furthermore, a plurality of auxiliary air inlet holes are provided on the mixing pipe above the air vent.

[0017] Furthermore, the axis of the mixing tube is perpendicular to and intersects with the axis of the sleeve.

[0018] Beneficial Effects

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The engine urea mixer of the present invention is applied to exhaust gas aftertreatment. A mixing tube arranged vertically therewith is added in the casing. Through the design of the baffle plate, the vent hole and the inclined plate, the exhaust gas first changes its flow direction through the baffle plate, and then enters the mixing tube in the form of a spiral airflow after being blocked by the inclined plate to contact with urea, so that the reducing agent and the engine exhaust are fully and evenly mixed, the length of the mixer is shortened, the production materials and costs, as well as the volume of the entire injection system are reduced, and the structural layout of the diesel engine aftertreatment system is reasonably optimized.

[0021] 2. The present invention further improves the mixing effect by further arranging a spoiler in the sleeve on one side of the gas outlet port so that the mixed gas is discharged again after impacting the spoiler, and a spoiler groove is arranged on the spoiler to impact the airflow again and change the direction of the airflow, further improving the mixing effect.

[0022] 3. The present invention also arranges a steel ball at the bottom of the mixing tube, which not only meets the gas passing requirement but also further improves the mixing effect. At the same time, it can filter out impurities in part of the tail gas, further improving the emission effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0024] Figure 2 It is a left-side structural schematic diagram of the present invention;

[0025] Figure 3 It is a right view structural schematic diagram of the present invention;

[0026] Figure 4 It is a top view structural schematic diagram of the installation of the mixing tube in the present invention;

[0027] Figure 5 It is an exploded view of the parts of the present invention.

[0028] Among them: 1-sleeve, 2-mixing tube, 3-inlet port, 4-outlet port, 5-vent, 6-inclined plate, 7-spoiler, 8-cover plate, 9-nozzle seat, 10-first spoiler, 11-second spoiler, 12-third spoiler, 13-steel wool, 14-gas collecting groove, 15-outlet, 16-spoiler groove, 17-auxiliary air inlet. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0030] See also Figure 1-5As shown, an engine urea mixer of the present invention comprises a sleeve 1, which is a hollow pipe for connecting with an exhaust gas exhaust pipe. A mixing tube 2 is vertically inserted in the sleeve 1, and the mixing tube 2 is a hollow pipe. A baffle is provided between the mixing tube 2 and the sleeve 1 to connect the two so as to separate the sleeve 1 into an air inlet port 3 and an air outlet port 4. The baffle isolates the sleeve 1 into two closed cavities. A plurality of vents 5 are provided on the outer periphery of the upper part of the mixing tube 2 to connect the air inlet port 3 and the air outlet port 4, so that the exhaust gas enters the mixing tube 2 only through the vents 5. The exhaust gas is blocked by the inclined plate 6 and obliquely cuts into the mixing tube 2 to form a spiral airflow. A spoiler 7 connected to the inner wall of the sleeve 1 is also provided in the sleeve 1 on one side of the exhaust port 4. The spoiler 7 can block and impact the mixed gas to further improve the mixing effect. A nozzle seat 9 for installing a nozzle is connected to the top of the mixing tube 2 through a cover plate 8, which is convenient for installing the urea nozzle and ensures that the urea can be sprayed into the mixing tube 2 to contact and react with the exhaust gas.

[0031] Specifically, the baffle plate includes a first baffle plate 10, a second baffle plate 11 and a third baffle plate 12, wherein the second baffle plate 11 is horizontally installed on the middle periphery of the mixing tube 2, the first baffle plate 10 and the third baffle plate 13 are vertically arranged, and the top of the first baffle plate 10 is connected to the second baffle plate 11, the lower periphery of the first baffle plate 10 is connected to the inner wall of the sleeve 1, the bottom of the third baffle plate 12 is connected to the second baffle plate 11, and the lower periphery of the third baffle plate 12 is connected to the inner wall of the sleeve 1. The three baffle plates block the exhaust gas circulation and can guide the exhaust gas to enter from the vent hole 5 of the mixing tube 2, thereby achieving the purpose of changing the direction of the airflow.

[0032] Preferably, the first spoiler 10 is a U-shaped plate with a protruding middle portion toward the air inlet port 3. The exhaust gas hits the protruding U-shaped plate, which has the effect of colliding and dispersing the airflow. Correspondingly, the third spoiler 12 is a U-shaped plate with a concave middle portion toward the air outlet port 4. The exhaust gas hits the concave U-shaped plate, which has the effect of converging and guiding the airflow, thereby introducing it into the air vent 5.

[0033] Preferably, a steel wool 13 is provided at the bottom of the mixing tube 2. The steel wool 13 is a stainless steel wool. The steel wool 13 can be supported by fixing a mounting bracket at the bottom of the mixing tube 2 to facilitate disassembly and replacement. The provision of the steel wool 13 can meet the gas passage requirements while further improving the mixing effect. At the same time, it can filter out impurities in part of the exhaust gas to further improve the emission effect.

[0034] Preferably, the spoiler 7 is a circular plate adapted to the inner wall of the sleeve 1, and an air collecting groove 14 is provided at the center of the spoiler 7. The air collecting groove 14 is a circular groove that can collect the mixed air flow to the center of the spoiler 7. A plurality of air outlet holes 15 are opened in the air collecting groove 14 to facilitate the discharge of the mixed air.

[0035] Preferably, a plurality of spoiler grooves 16 are evenly arranged on the spoiler plate 7 outside the air collecting groove 14. The cross section of the spoiler groove 16 is composed of two parabolas with different eccentricities. When the mixed gas hits the spoiler plate 7 and enters the spoiler groove 16, then flows back out of the spoiler groove 16, and is finally discharged from the air collecting groove 14, it can hit the airflow again and change the direction of the airflow, thereby further improving the mixing effect.

[0036] Preferably, the vent hole 5 is a long hole extending along the axial direction of the mixing tube 2, and correspondingly, the inclined plate 6 is a long plate extending along the axial direction of the mixing tube 2 to ensure the intake air flow.

[0037] Preferably, a plurality of auxiliary air inlet holes 17 are provided on the mixing tube 2 above the air vent 5 to assist air intake and ensure air intake flow.

[0038] Preferably, the axis of the mixing tube 2 is perpendicular to and intersects with the axis of the sleeve 1, thereby increasing the volume of the mixing tube 2, thereby increasing the mixing volume of the exhaust gas and urea, and further improving the mixing effect.

[0039] When the engine urea mixer of the present invention is in use, the exhaust gas enters the sleeve 1 from the air inlet port 3, is changed in direction under the obstruction of the first spoiler 10, the second spoiler 11 and the third spoiler 12, and is guided to the vent 5 and enters the mixing tube 2, so that the exhaust gas enters the mixing tube 2 in the form of a spiral airflow. At this time, the urea nozzle sprays urea into the mixing tube 2 to contact and react with the exhaust gas; then the mixed gas flows along the bottom of the mixing tube 2 and passes through the steel ball 13 and is discharged to the outlet port 4, the mixed gas continues to flow to the spoiler 7, hits the spoiler groove 16 again, and then gathers in the gas collecting groove 14, and is discharged from the outlet hole 15, thereby achieving the purpose of exhaust gas treatment. The engine urea mixer of the present invention is applied to exhaust gas post-treatment. A mixing tube arranged vertically therewith is added in the casing. Through the design of the baffle plate, the vent hole and the inclined plate, the exhaust gas first changes its flow direction through the baffle plate, and then enters the mixing tube in the form of a spiral airflow after being blocked by the inclined plate to contact with urea, so that the reducing agent and the engine exhaust are fully and evenly mixed, the length of the mixer is shortened, the production materials and costs, as well as the volume of the entire injection system are reduced, and the structural layout of the diesel engine post-treatment system is reasonably optimized.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. An engine urea mixer, comprising a sleeve (1), characterized in that: A mixing tube (2) is vertically inserted into the sleeve (1); a baffle plate is provided between the mixing tube (2) and the sleeve (1) to connect the two so as to separate the sleeve (1) into an air inlet port (3) and an air outlet port (4); a plurality of air vents (5) are provided on the outer periphery of the upper portion of the mixing tube (2) to connect the air inlet port (3) and the air outlet port (4); a slanted plate (6) arranged outwardly is provided on one side of each of the air vents (5); and a spoiler plate (7) connected to the inner wall of the sleeve (1) is also provided in the sleeve (1) on the side of the air outlet port (4). The top of the mixing tube (2) is connected to a nozzle seat (9) for mounting a nozzle through a cover plate (8); a gas collecting groove (14) is provided at the center of the spoiler (7), and a plurality of gas outlet holes (15) are provided in the gas collecting groove (14); a plurality of spoiler grooves (16) are evenly provided on the spoiler (7) outside the gas collecting groove (14), and the cross section of the spoiler groove (16) is composed of two parabolas with different eccentricities. When the mixed gas hits the spoiler (7), it enters the spoiler groove (16), then flows back out of the spoiler groove (16), and finally is discharged from the gas collecting groove (14).

2. An engine urea mixer according to claim 1, characterized in that: The baffle plate comprises a first baffle plate (10), a second baffle plate (11) and a third baffle plate (12); the second baffle plate (11) is horizontally installed on the periphery of the middle part of the mixing tube (2); the first baffle plate (10) and the third baffle plate (12) are both arranged vertically; the top of the first baffle plate (10) is connected to the second baffle plate (11); the lower periphery of the first baffle plate (10) is connected to the inner wall of the sleeve (1); the bottom of the third baffle plate (12) is connected to the second baffle plate (11); and the upper periphery of the third baffle plate (12) is connected to the inner wall of the sleeve (1).

3. An engine urea mixer according to claim 2, characterized in that: The first spoiler (10) is a U-shaped plate with a middle portion protruding toward one side of the air inlet port (3), and correspondingly, the third spoiler (12) is a U-shaped plate with a middle portion protruding toward one side of the air outlet port (4).

4. The engine urea mixer according to claim 1, characterized in that: A steel ball (13) is provided at the bottom of the mixing tube (2).

5. An engine urea mixer according to any one of claims 1 to 4, characterized in that: The vent hole (5) is a long hole extending along the axial direction of the mixing tube (2), and correspondingly, the inclined plate (6) is a long plate extending along the axial direction of the mixing tube (2).

6. The engine urea mixer according to claim 5, characterized in that: A plurality of auxiliary air inlet holes (17) are also provided on the mixing tube (2) above the air vent hole (5).

7. The engine urea mixer according to claim 1, characterized in that: The axis centerline of the mixing tube (2) is perpendicular to and intersects with the axis centerline of the sleeve (1).

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