Engine scr system urea nozzle with atomizing hole geometry

Abstract

The utility model discloses a kind of engine SCR system urea nozzles with atomizing hole geometric structure, specifically related to nozzle technical field, including limit ring, connection assembly is arranged on the limit ring, the connection assembly includes the feed cylinder being arranged in limit ring one end, the middle part of the limit ring is provided with shunt cone block, and the shape of shunt cone block is set as circular truncated cone, one end of the shunt cone block extends into feed cylinder, for the medium transported by feed cylinder is shunted.This utility model is shunted by circular truncated cone shunt cone block, multiple groups of shunt plate and geometric cavity dispersion plate cooperation, urea aqueous solution is shunted and scattered repeatedly, then it is guided to form fine mist particle by gathering board, increase the contact area with high-temperature tail gas, substantially shorten pyrolysis and hydrolysis time, improve NH3 generation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of nozzle technology, and more specifically, to a urea nozzle for an engine SCR system with an atomizing hole geometry. Background Technology

[0002] SCR (Selective Catalytic Reduction) technology is the core technology for modern diesel vehicle exhaust treatment. Its working principle is as follows: a 32.5% urea aqueous solution (also known as DEF) is precisely injected into the exhaust pipe. Urea undergoes pyrolysis and hydrolysis reactions in the high-temperature exhaust gas to generate ammonia (NH3) and carbon dioxide (CO2). Subsequently, NH3 selectively reacts with harmful nitrogen oxides (NOx) on the catalyst surface, converting them into harmless nitrogen (N2) and water (H2O), thereby achieving exhaust gas purification.

[0003] However, in practical applications, the urea nozzles in existing SCR systems exhibit poor atomization of the sprayed urea solution, resulting in large droplet particles and a small contact area with the high-temperature exhaust gas. This makes it difficult to quickly complete the pyrolysis and hydrolysis reactions, leading to low NH3 generation efficiency and incomplete NOx reduction. Furthermore, the spray diffusion range and concentration control precision are insufficient, resulting in excessive urea in some areas and insufficient urea in others within the exhaust pipe, further reducing NOx conversion efficiency. Large urea droplets easily collide with the exhaust pipe wall to form a liquid film. If this liquid film remains for a long time, it will gradually crystallize, not only clogging the exhaust pipe but also potentially causing increased engine back pressure due to pipe blockage, which can severely damage core engine components. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a urea nozzle for an engine SCR system with an atomizing hole geometry, which aims to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a urea nozzle for an engine SCR system with an atomizing hole geometry, including a limiting ring, on which a connecting component is provided; The connecting assembly includes a feed cylinder disposed at one end of a limiting ring, a flow-dividing cone block disposed in the middle of the limiting ring, and the flow-dividing cone block being shaped like a frustum. One end of the flow-dividing cone block extends into the feed cylinder for diverting the medium conveyed by the feed cylinder. Several flow-dividing plates are disposed on the outer side of the flow-dividing cone block for dispersing the medium after it has been diverted by the flow-dividing cone block. The limiting ring is provided with a plurality of hinge seats, and each hinge seat is hinged with a hinge block, and one end of each of the plurality of hinge blocks is provided with a gathering plate.

[0006] Optionally, in one possible implementation, one end of the diversion cone is provided with a diversion port, and the other end of the diversion cone is provided with a dispersion plate. The dispersion plate is composed of several supporting ribs, which are interlaced to form a geometric cavity for dispersing the medium. A rotating ring is sleeved on the outer side of the limiting ring, and a guide ring is provided on the inner wall of the rotating ring. Several pads are slidably connected on the guide ring. Optionally, in one possible implementation, multiple pads are fixed to the outside of the limiting ring, and a rotating ring is sleeved on the outside of the limiting ring. The outer side of the rotating ring has several oblique holes, and each oblique hole has a sliding column slidably connected to it. One end of the sliding column is fixed to the hinge block, so that when the rotating ring rotates, the oblique holes and the sliding column rub against each other to drive the hinge block to deflect. A second gear is sleeved on the outer side of the rotating ring, and a motor is provided at one end of the feed cylinder. A first gear is provided at the output end of the motor. The first gear meshes with the second gear, so that the motor drives the first gear to drive the second gear and the rotating ring to rotate. The technical effects and advantages of this utility model are as follows: By combining frustum-shaped diversion cones, multi-component diversion plates, and geometric cavity dispersion plates, the urea aqueous solution is diverted and dispersed multiple times, and then guided by a gathering plate to form fine mist particles, increasing the contact area with high-temperature exhaust gas, significantly shortening pyrolysis and hydrolysis time, and improving NH3 generation efficiency. The diameter of the injection channel enclosed by the focusing plate is adjusted by a rotating ring driven by a motor. The spray diffusion range can be dynamically controlled according to the exhaust gas flow and NOx concentration to avoid local urea excess or deficiency, ensure uniform NOx reduction, and prevent the fine mist urea particles from impacting the pipe wall to form a liquid film. This reduces crystal formation at the source, lowers the risk of exhaust pipe blockage, and ensures stable engine operation. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0008] Figure 1 This is a front view of the overall structure of this utility model.

[0009] Figure 2 This utility model Figure 1 Schematic diagram of the structure on the right.

[0010] Figure 3This is a schematic diagram of the limiting ring, feed cylinder, flow divider cone, flow divider plate, motor and first gear of this utility model.

[0011] Figure 4 This is a schematic diagram of the new material, including the gathering plate, rotating ring, oblique hole, guide ring, and second gear.

[0012] Figure 5 This utility model Figure 4 Exploded view.

[0013] The attached diagram is labeled as follows: 1. Limiting ring; 2. Feed cylinder; 3. Diverting cone block; 4. Diverting plate; 5. Hinge seat; 6. Hinge block; 7. Gathering plate; 8. Rotary ring; 9. Inclined hole; 10. Sliding column; 11. Guide ring; 12. Pad block; 13. Motor; 14. First gear; 15. Second gear. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Example 1 This embodiment discloses a urea nozzle for an engine SCR system with an atomizing hole geometry, which aims to solve the problems of urea aqueous solution being difficult to evaporate and decompose quickly, unevenly distributed, and prone to crystallization on the wall surface and clogging the exhaust pipe in the prior art.

[0016] Specifically, the urea nozzle of the engine SCR system with atomizing hole geometry includes a limiting ring 1, on which a connecting component, a convergence adjustment component, and a drive component are provided. Through the coordinated cooperation of each component, the efficient diversion, dispersion, and uniform atomization of the urea aqueous solution are achieved.

[0017] The connecting assembly includes a feed cylinder 2 fixedly installed at one end of the limit ring 1, as shown in the attached figure. Figure 3 As shown, a diversion cone 3 is integrally formed in the middle of the limiting ring 1. The diversion cone 3 is shaped like a frustum, with its small-diameter end extending to the inner side of the outlet of the feed cylinder 2. One end of the diversion cone 3 has a diversion port distributed in a ring array, and a dispersion plate is fixedly connected to the end of the diversion cone 3 away from the feed cylinder 2. The dispersion plate is composed of several staggered support ribs, which form a geometric cavity structure for secondary dispersion of the diverted medium. At the same time, several diversion plates 4 are fixedly connected to the outer wall of the diversion cone 3, which are evenly distributed along its axis. Each diversion plate 4 is arranged along the generatrix of the diversion cone 3 to further disperse the urea aqueous solution after initial diversion by the diversion cone 3.

[0018] Example 2 Based on Example 1, this example discloses a urea nozzle for an engine SCR system with an atomizing hole geometry, including a convergence adjustment assembly; The convergence adjustment assembly includes several hinge seats 5 fixedly installed on the end face of the limiting ring 1 away from the feed cylinder 2. Each hinge seat 5 is evenly distributed along the circumference of the limiting ring 1, and each hinge seat 5 is hinged to a hinge block 6 via a pin. The ends of the multiple hinge blocks 6 away from the hinge seats 5 are respectively fixedly connected to arc-shaped convergence plates 7. The multiple convergence plates 7 enclose an adjustable-diameter injection channel, as shown in the attached figure. Figure 4 As shown in the attached diagram. A swivel ring 8 is fitted around the outer side of the limiting ring 1. Figure 5 As shown, an annular guide ring 11 is fixedly connected to the inner wall of the rotating ring 8. Several sliding grooves corresponding to the hinge blocks 6 are opened on the guide ring 11. Each sliding groove is slidably connected to a pad 12. Multiple pads 12 are fixed on the outer wall of the limiting ring 1. The rotating ring 8 can rotate around the axis of the limiting ring 1 through the cooperation of the guide ring 11 and the pads 12.

[0019] The outer wall of the rotating ring 8 is provided with several oblique holes 9 that correspond one-to-one with the hinge block 6. Each oblique hole 9 is inclined relative to the radial direction of the rotating ring 8, and a sliding column 10 is slidably connected in each oblique hole 9. One end of the sliding column 10 is fixed on the outer wall of the hinge block 6. When the rotating ring 8 rotates, the inner wall of the oblique hole 9 and the sliding column 10 generate relative sliding friction, thereby driving the hinge block 6 to deflect around the hinge seat 5, so as to realize the adjustment of the diameter of the channel enclosed by the gathering plate 7.

[0020] Example 3 Based on Example 2, this example discloses a urea nozzle for an engine SCR system with an atomizing hole geometry, including a drive assembly; The drive assembly includes a motor 13 fixedly mounted on the outer wall of the feed cylinder 2 near the limit ring 1, as shown in the attached figure. Figure 3 As shown, the output end of the motor 13 is fixedly connected to the first gear 14 via a coupling, and the second gear 15 is fixedly sleeved on the outer side wall of the rotating ring 8. The first gear 14 and the second gear 15 mesh with each other. The motor 13 drives the first gear 14 to rotate, thereby driving the second gear 15 and the rotating ring 8 to rotate synchronously.

[0021] The specific working principle is as follows: When the engine SCR system is working, for example, a 32.5% urea aqueous solution is transported to the inside of the limiting ring 1 through the feed cylinder 2. It first comes into contact with the frustum-shaped diverting cone 3. The diverting cone 3 diverts the concentrated urea aqueous solution to the surrounding areas. The diverted urea aqueous solution flows through the diverting plate 4 and is further dispersed by the diverting plate 4 to form multiple water streams. Subsequently, the water stream enters the geometric cavity of the dispersion plate and is dispersed again by the interlaced support ribs, thus initially achieving a uniform distribution of the water stream.

[0022] Simultaneously, motor 13 is started, driving the first gear 14 to rotate. The first gear 14 meshes with and drives the second gear 15 and the rotating ring 8 to rotate around the axis of the limiting ring 1. During the rotation of the rotating ring 8, the inner wall of the inclined hole 9 slides relative to the sliding column 10. Since the inclined hole 9 is inclined, the sliding column 10, guided by the inclined hole 9, drives the hinge block 6 to deflect around the hinge seat 5, thereby adjusting the diameter of the injection channel formed by several gathering plates 7. According to the engine exhaust flow rate and NOx concentration, by adjusting the rotation direction and speed of motor 13, the deflection angle of the gathering plate 7 can be precisely controlled, realizing the dynamic adjustment of the injection channel diameter. Under the guidance of the gathering plate 7, the urea aqueous solution after multiple dispersions is sprayed out from the injection channel at a suitable flow rate and diffusion angle, forming uniform and fine mist particles.

[0023] The mist-like urea solution comes into full contact with the high-temperature exhaust gas, enabling rapid pyrolysis and hydrolysis reactions to generate ammonia. The ammonia then reacts efficiently with NOx on the catalyst surface to produce nitrogen and water, effectively solving the problems of slow evaporation and uneven distribution of urea solution in existing technologies. At the same time, because the urea solution is atomized into fine particles, the phenomenon of spray hitting the wall and forming a liquid film is greatly reduced, lowering the risk of crystallization clogging the exhaust pipe and ensuring the normal operation of the engine.

[0024] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A urea nozzle for an engine SCR system with an atomizing hole geometry, comprising a limiting ring (1), characterized in that: A connecting component is provided on the limiting ring (1); The connecting assembly includes a feed cylinder (2) disposed at one end of a limiting ring (1), a diverting cone (3) disposed in the middle of the limiting ring (1), and the diverting cone (3) is shaped as a frustum. One end of the diverting cone (3) extends into the feed cylinder (2) for diverting the medium conveyed by the feed cylinder (2). Several diverting plates (4) are disposed on the outer side of the diverting cone (3) for dispersing the medium after it has been diverted by the diverting cone (3). The limiting ring (1) is provided with a plurality of hinge seats (5), and each hinge seat (5) is hinged with a hinge block (6), and one end of each of the hinge blocks (6) is provided with a gathering plate (7).

2. The urea nozzle for an engine SCR system with atomizing hole geometry according to claim 1, characterized in that: One end of the diversion cone (3) is provided with a diversion port, and the other end of the diversion cone (3) is provided with a dispersion plate. The dispersion plate is composed of several supporting ribs, which are interlaced to form a geometric cavity for dispersing the medium.

3. The urea nozzle for an engine SCR system with atomizing hole geometry according to claim 1, characterized in that: A rotating ring (8) is sleeved on the outer side of the limiting ring (1), and a guide ring (11) is provided on the inner wall of the rotating ring (8). Several pads (12) are slidably connected on the guide ring (11).

4. The urea nozzle for an engine SCR system with atomizing hole geometry according to claim 3, characterized in that: Multiple pads (12) are fixed on the outside of the limiting ring (1), and the swivel ring (8) is sleeved on the outside of the limiting ring (1).

5. A urea nozzle for an engine SCR system with an atomizing hole geometry according to claim 3, characterized in that: The outer side of the rotating ring (8) is provided with several oblique holes (9), and each oblique hole (9) is slidably connected with a sliding column (10).

6. A urea nozzle for an engine SCR system with an atomizing hole geometry according to claim 5, characterized in that: One end of the slide column (10) is fixed on the hinge block (6) and is used to drive the hinge block (6) to deflect when the rotating ring (8) rotates by friction between the inclined hole (9) and the slide column (10).

7. A urea nozzle for an engine SCR system with an atomizing hole geometry according to claim 3, characterized in that: The outer side of the rotating ring (8) is fitted with a second gear (15), and one end of the feed cylinder (2) is equipped with a motor (13).

8. A urea nozzle for an engine SCR system with an atomizing hole geometry according to claim 7, characterized in that: The output end of the motor (13) is provided with a first gear (14), which meshes with a second gear (15) for the motor (13) to drive the first gear (14) to drive the second gear (15) and the rotating ring (8) to rotate.

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