Atomizing sheet of swirl nozzle and post-treatment atomizing nozzle of internal combustion engine

Abstract

The utility model relates to the technical field of internal combustion engine post-processing, in particular to a swirl nozzle atomizing sheet which comprises an atomizing sheet, a flow dividing structure, a swirl structure and a transition flow channel, and the flow dividing structure, the swirl structure and the transition flow channel are arranged on the atomizing sheet. The transition runner is arranged on the side face of the atomization piece and used for connecting the flow dividing structure and the rotational flow structure so as to guide fluid to flow to the rotational flow structure from the flow dividing structure, the flow dividing structure is located on one side of the atomization piece and comprises flow dividing holes and flow dividing channels, and the flow dividing channels are radially distributed in the circumferential direction of the flow dividing holes; the atomizing piece is located on one side of the atomizing piece and communicated with the flow dividing hole in the center, the rotational flow structure is located on the other side of the atomizing piece and comprises a rotational flow cavity and rotational flow channels, and the rotational flow channels are distributed in the circumferential direction of the rotational flow cavity in the radial direction and communicated with the rotational flow cavity in the center. The atomizing nozzle solves the problem that an existing atomizing nozzle is poor in atomizing effect.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine aftertreatment technology, and in particular to a swirling nozzle atomizing plate and an internal combustion engine aftertreatment atomizing nozzle. Background Technology

[0002] With the promulgation of the National VI emission standards for motor vehicles, emission standards have become more stringent, leading to higher requirements for motor vehicle after-treatment systems. Urea-SCR technology is currently the primary method for treating NOx pollutants. Improving the atomization effect of the urea solution to ensure thorough mixing with engine exhaust gases and thus enhance reaction efficiency is particularly important.

[0003] In existing pressure-type atomizing nozzles, a pump pressurizes the liquid to increase its kinetic energy. The liquid, now possessing kinetic energy, is ejected from the orifice in the form of a liquid film or a liquid column. Under the disturbance of a low-speed external airflow, the liquid film breaks up, atomizing into smaller droplets. This type of atomizing nozzle has poor atomization effect. To improve the atomization effect, it is necessary to increase the pressure difference between the nozzle inlet and outlet, which inevitably increases additional costs.

[0004] In order to solve the above-mentioned technical problems, this utility model designs a swirling nozzle atomizing plate and an internal combustion engine aftertreatment atomizing nozzle. Utility Model Content

[0005] This utility model provides a swirling nozzle atomizing plate and an aftertreatment atomizing nozzle for internal combustion engines, aiming to solve the problem of poor atomization effect of existing atomizing nozzles. The technical solution is as follows:

[0006] A swirling nozzle atomizing plate includes an atomizing plate and a flow-dividing structure, a swirling structure, and a transition channel disposed on the atomizing plate. The transition channel is disposed on the side of the atomizing plate and is used to connect the flow-dividing structure and the swirling structure to guide fluid from the flow-dividing structure to the swirling structure. The flow-dividing structure is located on one side of the atomizing plate and includes a flow-dividing orifice and a flow-dividing channel. The flow-dividing channel is radially distributed along the circumference of the flow-dividing orifice and communicates with the flow-dividing orifice at the center. The swirling structure is located on the other side of the atomizing plate and includes a swirling chamber and a swirling channel. The swirling channel is radially distributed along the circumference of the swirling chamber and communicates with the swirling chamber at the center.

[0007] An aftertreatment atomizing nozzle for an internal combustion engine includes the aforementioned swirl nozzle atomizing plate, nozzle body, and seal. A nozzle transition channel is formed within the nozzle body for liquid flow. The seal and swirl nozzle atomizing plate are installed within the nozzle body. A nozzle outlet is provided at the end of the nozzle body.

[0008] Based on the above technical solution, there are three diversion channels, which are distributed radially at equal intervals with the diversion hole as the center, and each diversion channel is spaced 120 degrees apart.

[0009] Furthermore, the vortex channel is a tapered vortex channel.

[0010] Preferably, there are three swirling channels, and the swirling channels are tangent to the wires of the swirling chamber.

[0011] Beneficial effects

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: On the one hand, the atomizing plate adopts a gradually narrowing swirling channel, which can convert part of the pressure potential energy of the incoming liquid into kinetic potential energy, thereby increasing the swirling speed. On the other hand, the fluid medium is guided through multiple segments, and the fluid medium gains radial velocity in the diversion structure. In the transition channel, it impacts and forms turbulence due to the rapid change of the channel structure, thus improving the atomization effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0014] Figure 1 : A schematic diagram of the structure of the swirling nozzle atomizing plate of this utility model;

[0015] Figure 2 : A schematic diagram of the flow splitting structure described in this utility model;

[0016] Figure 3 : A schematic diagram of the swirl structure described in this utility model;

[0017] Figure 4 : A schematic diagram of the structure of the aftertreatment atomizing nozzle for internal combustion engines described in this utility model;

[0018] Figure 5 : A cross-sectional view of the swirl nozzle atomizing plate of the aftertreatment atomizing nozzle for an internal combustion engine of this utility model; Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and examples:

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1 As shown, a swirling nozzle atomizing plate is characterized by comprising an atomizing plate 1 and a flow-dividing structure, a swirling structure, and a transition channel 2 disposed on the atomizing plate 1; the transition channel 2 is disposed on the side of the atomizing plate 1 and is used to connect the flow-dividing structure and the swirling structure to guide the fluid from the flow-dividing structure to the swirling structure.

[0024] like Figure 2 As shown, the flow splitting structure is located on one side of the atomizing plate 1. The flow splitting structure includes a flow splitting hole 3 and a flow splitting channel 4. The flow splitting channel 4 is radially distributed along the circumference of the flow splitting hole 3 and is connected to the flow splitting hole 3 at the center.

[0025] The flow splitting structure divides the incoming fluid into several equal or proportionally proportioned smaller streams, ensuring that the fluid is evenly distributed throughout the subsequent swirling structure. This uniform fluid distribution helps to form more consistent atomized droplet sizes, improving the uniformity of the spray.

[0026] The flow-dividing channels 4 consist of three channels, evenly spaced radially around the flow-dividing orifice 3, with each channel spaced 120 degrees apart. This equidistant distribution ensures that the fluid exiting the central orifice is uniformly divided into three streams before flowing into the vortex structure. This helps guarantee that each fluid stream entering the vortex chamber has a similar flow rate and velocity, thereby improving atomization uniformity. If the flow-dividing channels 4 are not evenly spaced or are asymmetrical in number, the fluid flow rate on one side may be greater than on the other, resulting in uneven droplet distribution or directional flow at the nozzle outlet. The 120-degree angular distribution of the three channels effectively avoids this, ensuring a symmetrical and stable spray pattern.

[0027] like Figure 3 As shown, the swirling structure is located on the other side of the atomizing plate 1. The swirling structure includes a swirling chamber 5 and a swirling channel 6. The swirling channel 6 is radially distributed along the circumference of the swirling chamber 5 and is connected to the swirling chamber 5 at the center.

[0028] When the fluid travels from the split structure through the transition channel 2 to the vortex structure, it first enters the vortex channel 6. Since the vortex channel 6 is radially distributed along the circumference and connected to the vortex chamber 5 at the center, the fluid is quickly guided and begins to rotate. The fluid collides with the wall, intensifying the formation of turbulence, and then collects in the vortex chamber 5.

[0029] The swirl channel 6 is a tapered swirl channel. As the fluid advances along the swirl channel 6, the channel gradually narrows, hence the tapering design. This causes an increase in fluid velocity, and due to geometric constraints, the fluid is forced to rotate more tightly around its axis, enhancing its angular momentum. The tapering channel design follows Bernoulli's principle, meaning that as the channel cross-section gradually decreases, the fluid velocity increases accordingly. This acceleration effect helps to propel the liquid out of the nozzle at a higher velocity, thereby producing finer droplets and improving the quality of atomization.

[0030] There are three swirling channels 6, each tangent to the guide wire of the swirling chamber 5. The three swirling channels 6 are evenly spaced, each 120 degrees apart, and tangent to the guide wire of the swirling chamber 5, ensuring that the fluid entering the swirling chamber 5 receives uniform rotational kinetic energy. This helps to form a more stable and symmetrical rotating flow field, avoiding eccentric rotation or uneven droplet distribution. The guide wire refers to the edge curve at the outlet of the swirling channel 6.

[0031] The outlet of the swirling channel 6 and the inlet of the swirling chamber 5 transition smoothly, with their junction sharing a common tangent curve. This smooth transition and common tangent curve design minimizes energy loss as the fluid enters the swirling chamber 5. When the fluid flows smoothly into the swirling chamber 5 tangentially, it avoids energy dissipation and turbulence formation caused by direct impact on the chamber wall, thus more effectively converting kinetic energy into rotational energy.

[0032] The transition channels 2 are located on the side of the atomizing plate 1, and there are 3 of them. They connect the diversion channel 4 and the swirl channel 6. In the area of ​​the transition channel 2, due to the rapid change of the fluid channel, the fluid collides with the wall, which intensifies the formation of turbulence. It should also be noted that the cross-sectional area of ​​the transition channel 2 is larger than that of the diversion channel 4. The suddenly increased channel area also provides favorable conditions for the development and growth of turbulence.

[0033] The atomizing plate 1 is made of a corrosion-resistant, high-strength material. This corrosion-resistant material resists the corrosive effects of chemical media, such as urea solutions, acidic or alkaline substances, preventing structural damage due to corrosion during long-term use. This significantly extends the service life of the atomizing plate and reduces the frequency of replacement.

[0034] like Figure 4 As shown, an aftertreatment atomizing nozzle for an internal combustion engine includes a swirl nozzle atomizing plate, a nozzle body 7, and a sealing member 8 as described above. A nozzle transition channel is provided in the nozzle body 7 for liquid to flow through. The sealing member 8 and the swirl nozzle atomizing plate 9 are installed in the nozzle body 7. A nozzle outlet 91 is provided at the end of the nozzle body 7.

[0035] The nozzle body 7 is the basic structure of the entire nozzle, supporting and housing other internal components while guiding the flow path of the liquid from the inlet to the outlet. An internal nozzle transition channel allows for liquid flow, ensuring smooth delivery of the fluid to the vortex nozzle atomizing plate 9. The seal 8 is made of elastic material, ensuring a tight fit between the internal components of the nozzle, preventing liquid leakage, and maintaining the pressure integrity of the system. The nozzle outlet 91 is the final part of the nozzle, directly controlling the final direction and shape of the liquid ejection. The nozzle outlet 91 is designed with a porous structure, with the orifice diameter and distribution optimized according to the desired atomization effect. It is designed with a porous structure or other optimized shape to ensure that the liquid is ejected in the most ideal pattern, forming uniformly distributed fine droplets. An adjustment device can be provided to allow adjustment of the spray angle or flow rate according to actual needs.

[0036] like Figure 5 There is a gap between the atomizing plate 9 of the swirl nozzle and the nozzle wall of the nozzle body 7, and fluid flows through the gap and the transition channel 2 of the atomizing plate 9.

[0037] The following is a detailed description of the fluid flow process:

[0038] In the absence of an operating signal, the control seal 8 remains closed, preventing fluid from entering the nozzle. When the control system issues a command, the control seal 8 opens, allowing fluid to enter the swirling nozzle atomizing plate 9 inside the nozzle body 7 from the inlet 72.

[0039] The fluid then reaches the diversion orifice 3 on the atomizing plate 9 of the swirl nozzle. At this point, the fluid pressure and velocity are relatively high. The fluid is divided into three streams from the central diversion orifice 3, with each stream spaced 120 degrees apart. This equal division design ensures uniform fluid distribution. After passing through the diversion orifice, the fluid enters the diversion channel 4, where the fluid velocity begins to stabilize to a certain extent, preparing for the subsequent rotational motion.

[0040] The fluid flowing out of the diversion channel 4 then flows into the transition channel 2. The cross-sectional area of ​​the transition channel is larger than that of the diversion channel, which helps reduce pressure loss in the fluid and allows multiple fluid streams to merge more smoothly. In the transition channel, the fluid velocity gradually decreases, while its energy is redistributed, preparing for the next step of efficient rotation.

[0041] The fluid then enters the gradually narrowing vortex channel 6. As the channel cross-section gradually decreases, the fluid velocity increases, creating a strong helical flow. This design maximizes the retention of fluid momentum and enhances its rotational intensity. Because the vortex channel 6 is tangential to the guide wire of the vortex chamber 5, the fluid enters the vortex chamber tangentially, avoiding energy loss caused by direct impact on the chamber wall. Within the vortex chamber 5, the fluid forms a highly ordered and powerful rotating flow field, increasing the centrifugal force of the liquid and making it easier for droplets to separate from the liquid film. The increased rotational kinetic energy is further converted into the tangential velocity of the fluid medium at the nozzle outlet 91, making it easier for the liquid film to break up upon contact with air, thus producing a better atomization effect. Finally, these high-speed rotating fine droplets are ejected through the nozzle outlet 91, forming the ideal atomization effect. The nozzle outlet design ensures uniform droplet distribution and an appropriate spray angle to meet the needs of specific applications.

[0042] The fluid medium flowing through the nozzle is guided in multiple segments. The fluid medium gains radial velocity in the flow splitting structure and impacts to form turbulence in the transition channel 2 due to the rapid changes in the channel structure.

[0043] By making the spiral of the swirl chamber 5 tangent to the spiral of the swirl channel 6 on one side, the transition between the swirl channel and the inlet of the swirl chamber 5 is smooth, and the two curves at the junction are tangent to each other, which can reduce the impact and wear of the liquid flow on the metal material, thereby improving the service life of the parts.

[0044] The swirl channel 6 of the atomizing plate is a gradually narrowing channel, which can convert part of the pressure potential energy of the incoming liquid into kinetic potential energy, thereby increasing the swirling speed. By using rotational kinetic energy, the liquid can overcome its own viscosity and surface tension, making it easier to atomize and break up when flowing through the nozzle outlet, resulting in a better atomization effect.

[0045] This device optimizes fluid distribution and initial stabilization, and enhances rotational motion through a swirling structure, causing the fluid medium to form turbulence, thereby making the atomized particles of the nozzle smaller and the atomization effect better.

[0046] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A swirling nozzle atomizing plate, characterized in that: It includes an atomizing plate (1) and a flow splitting structure, a swirling structure and a transition channel (2) disposed on the atomizing plate (1); the transition channel (2) is disposed on the side of the atomizing plate (1) and is used to connect the flow splitting structure and the swirling structure to guide the fluid from the flow splitting structure to the swirling structure. The flow splitting structure is located on one side of the atomizing plate (1). The flow splitting structure includes a flow splitting hole (3) and a flow splitting channel (4). The flow splitting channel (4) is radially distributed along the circumferential direction of the flow splitting hole (3) and is connected to the flow splitting hole (3) at the center. The swirling structure is located on the other side of the atomizing plate (1). The swirling structure includes a swirling chamber (5) and a swirling channel (6). The swirling channel (6) is radially distributed along the circumferential direction of the swirling chamber (5) and is connected to the swirling chamber (5) at the center.

2. The swirl nozzle atomizing plate according to claim 1, characterized in that... The diversion channel (4) consists of three channels, which are distributed radially at equal intervals with the diversion hole (3) as the center, and each channel is spaced 120 degrees apart.

3. The swirl nozzle atomizing plate according to claim 2, characterized in that... The vortex channel (6) is a gradually narrowing vortex channel.

4. The swirl nozzle atomizing plate according to claim 3, characterized in that... The swirling channel (6) consists of three channels, and the swirling channel (6) is tangent to the conductor of the swirling chamber (5).

5. A swirling nozzle atomizing plate according to claim 3, characterized in that... The cross-sectional area of ​​the transition channel (2) is greater than that of the diversion channel (4).

6. A swirling nozzle atomizing plate according to claim 4, characterized in that... The outlet of the swirling channel (6) and the inlet of the swirling chamber (5) are smoothly connected, and the curves at the junction of the two are tangent to each other.

7. The swirl nozzle atomizing plate according to claim 1, characterized in that... The atomizing plate (1) is made of corrosion-resistant and high-strength material.

8. An aftertreatment atomizing nozzle for an internal combustion engine, characterized in that... The nozzle body (7) comprises a swirl nozzle atomizing plate, a nozzle body (7) and a seal (8) as described in any one of claims 1 to 7. A nozzle transition channel is provided in the nozzle body (7) for liquid to flow through. The seal (8) and the swirl nozzle atomizing plate (9) are installed in the nozzle body (7). A nozzle outlet (91) is provided at the end of the nozzle body (7).

9. The aftertreatment atomizing nozzle for an internal combustion engine according to claim 8, characterized in that... The nozzle outlet (91) is designed with a porous structure, and the diameter and distribution of each pore are optimized according to the required atomization effect.

10. An aftertreatment atomizing nozzle for an internal combustion engine according to claim 8, characterized in that... The seal (8) is made of elastic material.

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