Double-rotational-flow valve body for urea nozzle and urea nozzle

Abstract

The utility model relates to the technical field of urea spraying, in particular to a double-rotational-flow valve body for a urea nozzle and the urea nozzle, the double-rotational-flow valve body comprises a body, the body is provided with a first end face, a second end face and a side wall, the first end face and the second end face are opposite to each other, the side wall is connected with the first end face and the second end face, and an inlet groove is formed in the first end face; an outlet groove is formed in the second end face, and the body is provided with a double-rotational-flow runner communicated with the inlet groove and the outlet groove. The double-swirl flow channel comprises an inlet flow channel, an outlet flow channel and a connecting flow channel, the inlet flow channel is arranged on the first end face and communicated with the inlet groove, the outlet flow channel is arranged on the second end face and communicated with the outlet groove, and the connecting flow channel is arranged on the side wall and connected with the inlet flow channel and the outlet flow channel. According to the double-rotational-flow valve body, the rotational flow strength of the urea nozzle can be improved, the spraying effect is improved, the double-rotational-flow valve body can have high machining consistency, and the reliability of the urea nozzle is improved.

Description

Technical Field

[0001] This application relates to the field of urea injection technology, and in particular to a dual-swirling valve body and a urea nozzle for use in urea nozzles. Background Technology

[0002] With the rapid development of the automotive industry, diesel vehicle exhaust pollution has attracted increasing attention. In aftertreatment technology, urea solution is typically used, injected into an aftertreatment mixer. In the mixer, a series of physicochemical reactions, including collision, evaporation, hydrolysis, and pyrolysis, convert the urea solution into ammonia and nitrogen oxides. The urea injection system plays a crucial role in the atomization, evaporation, pyrolysis, and mixing of the urea solution. However, current urea nozzles mostly use direct-injection six-hole nozzles, with the nozzle simply designed as a six-hole spray plate. This results in larger particle sizes, poor atomization quality, and a lack of swirling characteristics. Alternatively, the urea nozzle typically has a swirling function in the lower spray plate, while the upper spray plate connected near the ball valve usually does not. In this case, the swirling intensity mainly relies on the lower spray plate, and the orifice length of the upper spray plate is not fully utilized, making it difficult for the swirling structure to function optimally. Utility Model Content

[0003] In view of the problems existing in the background art, this application provides a dual swirl valve body for urea nozzle and a urea nozzle. The dual swirl valve body can improve the swirl intensity of the urea nozzle and improve the spray effect. Moreover, the dual swirl valve body can have high processing consistency and improve the reliability of the urea nozzle.

[0004] According to one aspect of the present invention, a dual-swirl valve body for a urea nozzle is provided, comprising a body having a first end face, a second end face, and a sidewall connecting the first end face and the second end face. An inlet groove is formed on the first end face, and an outlet groove is formed on the second end face. The body is provided with a dual-swirl channel communicating with the inlet groove and the outlet groove. The dual-swirl channel includes an inlet channel, an outlet channel, and a connecting channel. The inlet channel is located on the first end face and communicates with the inlet groove. The outlet channel is located on the second end face and communicates with the outlet groove. The connecting channel is located on the sidewall and connects the inlet channel and the outlet channel.

[0005] In some embodiments of this invention, the swirling directions of the inlet channel and the outlet channel are opposite.

[0006] In some embodiments of this utility model, the inlet channel, connecting channel, and outlet channel are all curved channels.

[0007] In some embodiments of this utility model, the inlet channel is tangent to the edge of the inlet groove, and the outlet channel is tangent to the edge of the outlet groove.

[0008] In some embodiments of this utility model, the inlet channel gradually tapers from the end near the inlet groove to the end away from the inlet groove.

[0009] In some embodiments of this utility model, the outlet channel gradually tapers from the end furthest from the outlet groove to the end closest to the outlet groove.

[0010] In some embodiments of this utility model, the two ends of the connecting channel smoothly transition to the inlet channel and the outlet channel, respectively.

[0011] In some embodiments of this utility model, the number of dual swirling channels is multiple.

[0012] According to another aspect of the present invention, a urea nozzle is provided, comprising the aforementioned double swirl valve body and a nozzle plate disposed on the second end face, wherein the nozzle plate is provided with a nozzle corresponding to the outlet groove.

[0013] In some embodiments of this utility model, the minimum cross-sectional dimension of the outlet flow channel of the dual swirl valve body is larger than the nozzle size of the nozzle plate.

[0014] Compared with the prior art, the present invention achieves the following technical effects:

[0015] This application provides a dual-swirl valve body for a urea nozzle. This dual-swirl valve body forms a dual-swirl channel connecting the inlet and outlet slots on a single body. When multiple dual-swirl channels converge, a strong impact is generated. As the impact angle increases, the velocity component of the urea solution jet in the horizontal direction increases, while the velocity component in the vertical direction decreases. The actual impact momentum of the two jets increases, increasing the lateral instability of the liquid film generated by the collision. The turbulent motion of the urea solution becomes more intense, reaching the critical breakage point within a relatively short distance. The increased impact angle further intensifies the liquid film breakage, improving the swirl intensity of the urea nozzle and enhancing the spray effect. Furthermore, the integrated dual-swirl valve body ensures high processing consistency, improves assembly accuracy, and enhances the reliability of the urea nozzle. Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the dual swirl valve body of this application;

[0018] Figure 2 This is a schematic diagram of the first end face of the dual swirl valve body of this application;

[0019] Figure 3 This is a schematic diagram of the second end face of the dual swirl valve body of this application;

[0020] Figure 4 This is a schematic diagram of the overall structure of the urea nozzle in this application;

[0021] Figure 5 This is a partial schematic diagram of the valve structure of this application;

[0022] Figure 6 This is a schematic diagram of the nozzle plate of this application.

[0023] The reference numerals in the attached drawings represent the following: 1. Body; 11. First end face; 12. Second end face; 2. Inlet groove; 3. Outlet groove; 4. Inlet flow channel; 5. Outlet flow channel; 6. Connecting flow channel; 10. Urea pipe quick-connect coupling; 20. Valve structure; 21. Push rod; 22. Sealing ball; 23. Sealing valve seat; 24. Nozzle plate; 241. Nozzle; 30. Electromagnetic unit. Detailed Implementation

[0024] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0025] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0026] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0027] This application discloses a dual-swirl valve body for a urea nozzle. For example... Figure 1-3As shown, the dual swirl valve body includes a body 1, which has a first end face 11, a second end face 12 facing each other, and a side wall connecting the first end face 11 and the second end face 12. An inlet groove 2 is formed on the first end face 11, and an outlet groove 3 is formed on the second end face 12. The body 1 is provided with a dual swirl flow channel connecting the inlet groove 2 and the outlet groove 3.

[0028] The dual vortex flow channel includes an inlet flow channel 4, an outlet flow channel 5, and a connecting flow channel 6. The inlet flow channel 4 is located on the first end face 11 and communicates with the inlet groove 2. The outlet flow channel 5 is located on the second end face 12 and communicates with the outlet groove 3. The connecting flow channel 6 is located on the side wall and connects the inlet flow channel 4 and the outlet flow channel 5.

[0029] By installing the dual-swirl valve body of this invention into the urea nozzle, when the urea nozzle is running, the urea solution first enters the inlet groove 2 and flows from the inlet groove 2 into the inlet channel 4. The fluid is accelerated by swirling in the inlet channel 4, and then enters the outlet channel 5 through the connecting channel 6. The fluid is further accelerated by swirling in the outlet channel 5, thus causing an impact in the outlet groove 3, especially when multiple dual-swirl channels converge. As the impact angle increases, the velocity component of the urea solution jet in the horizontal direction increases, while the velocity component in the vertical direction decreases. The actual impact momentum of the two jets increases, thus increasing the instability of the liquid film generated by the collision in the lateral direction. The turbulent motion of the urea solution becomes more intense, which is directly manifested as an increase in the amplitude of the impact wave fluctuation, reaching the critical breakage point within a relatively short distance. The increased impact angle also leads to intensified liquid film breakage, thereby improving the swirling intensity of the urea nozzle and improving the spray effect. Furthermore, the main body 1 is a one-piece structure design, that is, the dual-swirl valve body is a one-piece valve body, which can have high processing consistency, improve assembly accuracy, and improve the reliability of the urea nozzle.

[0030] In addition, the dual-swirling valve body of this invention can not only reduce the particle size and improve the ammonia conversion rate, but also increase the horizontal velocity of the dual-swirling fluid, which can effectively impact the crystallization caused by long-term use at the nozzle outlet and prevent crystallization from occurring at the nozzle outlet.

[0031] In some embodiments of this utility model, such as Figure 1 As shown, the swirling directions of the inlet channel 4 and the outlet channel 5 are opposite.

[0032] In this embodiment, it should be understood that the swirling directions of the inlet channel 4 and the outlet channel 5 are designed to be opposite, that is, the flow direction of the fluid in the inlet channel 4 is opposite to the flow direction in the outlet channel 5 and maintains a certain angle. They are connected by the connecting channel 6 so that the fluid can better achieve the effect of double swirling.

[0033] In some embodiments of this utility model, such as Figure 1-3As shown, the inlet channel 4, the connecting channel 6, and the outlet channel 5 are all curved channels.

[0034] In this embodiment, the inlet channel 4, connecting channel 6, and outlet channel 5 are designed as curved channels, that is, they are respectively arc-shaped. Multiple arc segments are connected to make the double swirling flow channel approximately a circular structure, thus better forming the swirling flow channel (e.g., Figure 1 (As shown in the ring formed by the hollow solid arrow and the hollow dashed arrow), the double swirl channel can have a continuous curvature with an optimized hydrodynamic profile, conforming to the natural trajectory of fluid movement. This can reduce obstruction and energy loss, further enhance the swirl intensity, and improve the spray effect.

[0035] In some embodiments of this utility model, such as Figure 1-3 As shown, the inlet channel 4 is tangent to the edge of the inlet groove 2, and the outlet channel 5 is tangent to the edge of the outlet groove 3.

[0036] In this embodiment, making the inlet channel 4 tangent to the edge of the inlet groove 2 and the outlet channel 5 tangent to the edge of the outlet groove 3 can reduce the obstruction of fluid entering the inlet channel 4 from the inlet groove 2 and entering the outlet groove 3 from the outlet channel 5, so that the fluid flows more smoothly.

[0037] In some embodiments of this utility model, such as Figure 2 As shown, the inlet channel 4 gradually tapers from the end closest to the inlet groove 2 to the end furthest from the inlet groove 2.

[0038] In this embodiment, by gradually narrowing the inlet channel 4 from the end closest to the inlet groove 2 to the end furthest from the inlet groove 2, the fluid velocity can be increased from the center of the first end face 11 to the surrounding area, effectively improving the fluid kinetic energy.

[0039] In some embodiments of this utility model, such as Figure 3 As shown, the outlet flow channel 5 gradually tapers from the end furthest from the outlet groove 3 to the end closest to the outlet groove 3.

[0040] In this embodiment, by gradually narrowing the outlet channel 5 from the end away from the outlet groove 3 to the end closer to the outlet groove 3, the fluid velocity can be increased from the periphery of the second end face 12 to the center, thereby further improving the fluid kinetic energy.

[0041] In some embodiments of this utility model, such as Figure 1 As shown, the two ends of the connecting channel 6 smoothly transition to the inlet channel 4 and the outlet channel 5, respectively, that is, the width of the two ends of the connecting channel 6 is the same as the width of the four edges of the inlet channel 4 and the outlet channel 5.

[0042] In this embodiment, the two ends of the connecting channel 6 are smoothly transitioned to the inlet channel 4 and the outlet channel 5, which can reduce the energy loss of the fluid from the inlet channel 4 to the outlet channel 5 and ensure the swirling effect.

[0043] In some embodiments of this utility model, such as Figure 1 As shown, there are multiple double swirl channels.

[0044] Preferably, multiple double swirl channels are evenly distributed on the body 1, and the inlet groove 2 and outlet groove 3 of the double swirl channels are preferably located in the central regions of the first end face 11 and the second end face 12, respectively.

[0045] Furthermore, the number of dual swirl channels can be designed to be 3-6, for example, 3, 4, 5 or 6 dual swirl channels, etc.

[0046] Furthermore, when the size of the dual swirl valve body is not limited, the flow channel can be designed as n channels, where n is greater than 6.

[0047] This embodiment also proposes a urea nozzle, such as Figure 4-6 As shown, the urea nozzle includes the aforementioned double swirl valve body and a nozzle plate 24 disposed on the second end face 12. The nozzle plate 24 is provided with a nozzle 241 corresponding to the outlet groove 3.

[0048] Specifically, such as Figure 4 and Figure 5 As shown, the urea nozzle may include a urea pipe quick-change connector 10, a valve structure 20, and an electromagnetic unit 30. The valve structure 20 may include a stationary iron, a preload bolt, a preload spring sleeve, a preload spring, a nozzle protective sleeve, a push rod 21, a sealing ball 22, a sealing valve seat 23, and the aforementioned double swirl valve body and nozzle plate 24. Under the action of the preload bolt, the preload spring causes the sealing ball 22 at the head of the push rod 21 to be tightly pressed against the sealing valve seat 23, thereby sealing the sealing valve seat 23.

[0049] When the urea nozzle is in normal use, the urea pipe quick-connect connector 10 is connected to the urea pressure pipe, and the urea injection signal line is inserted into the connector of the electromagnetic unit 30. When the urea injection signal is sent to the electromagnetic unit 30, the electromagnetic unit 30 is energized, pulling the push rod 21 and the sealing ball 22 in the valve structure 20 to move to the left, opening the channel in the sealing valve seat 23, allowing the urea solution to enter the double swirl valve body, and finally spraying out from the nozzle plate 24. When the electromagnetic unit 30 is de-energized, under the action of the spring force of the pre-tightening spring, the push rod 21 and the sealing ball 22 move to the right, and the urea nozzle closes.

[0050] In this invention, the size of the outlet channel 5 and the outlet groove 3 in the dual swirl valve body directly determines the size of the spray particle size and velocity, and can be designed according to the urea injection requirements.

[0051] For example, the nozzle 241 of the nozzle plate 24 has a size of 0.3mm, 0.4mm, and 0.5mm. At this time, the flow rate is relatively small. By adjusting the size of the nozzle 241 and the minimum cross-section of the outlet flow channel 5 in the double swirl valve body, nozzles with different particle sizes and cone angles can be designed.

[0052] In some embodiments of this utility model, when the required flow rate increases and the swirl is strong, the outlet flow channel 5 and outlet groove 3 in the double swirl valve body are enlarged as much as possible, and the minimum cross-section of the outlet flow channel 5 in the double swirl valve body is larger than the size of the nozzle 241 of the nozzle plate 24, so as to prevent the outlet flow channel 5 in the double swirl valve body from restricting the flow.

[0053] In this invention, by changing the number of double swirling channels, the angle of the rotating channels, the minimum cross-sectional area of ​​the outlet channel 5, and the size of the nozzle 241 orifice of the nozzle plate 24, the requirements of the urea nozzle for different particle sizes, different nozzle angles, and different penetration distances can be effectively met.

[0054] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A dual-swirl valve body for a urea injector, characterized by, Includes a body (1), the body (1) having a first end face (11), a second end face (12) facing each other and a sidewall connecting the first end face (11) and the second end face (12), an inlet groove (2) is formed on the first end face (11), an outlet groove (3) is formed on the second end face (12), and the body (1) is provided with a double vortex flow channel connecting the inlet groove (2) and the outlet groove (3); The dual vortex flow channel includes an inlet flow channel (4), an outlet flow channel (5), and a connecting flow channel (6). The inlet flow channel (4) is located on the first end face (11) and communicates with the inlet groove (2). The outlet flow channel (5) is located on the second end face (12) and communicates with the outlet groove (3). The connecting flow channel (6) is located on the side wall and connects the inlet flow channel (4) and the outlet flow channel (5).

2. The double rotary valve body of claim 1, wherein The swirling directions of the inlet channel (4) and the outlet channel (5) are opposite.

3. The double rotary valve body of claim 1, wherein, The inlet channel (4), connecting channel (6) and outlet channel (5) are all curved channels.

4. The double rotary valve body of claim 3, wherein, The inlet channel (4) is tangent to the edge of the inlet groove (2), and the outlet channel (5) is tangent to the edge of the outlet groove (3).

5. The double rotary valve body of claim 1, wherein, The inlet channel (4) gradually tapers from the end closest to the inlet groove (2) to the end furthest from the inlet groove (2).

6. The double rotary valve body of claim 1, wherein, The outlet channel (5) gradually tapers from the end away from the outlet groove (3) to the end closer to the outlet groove (3).

7. The double rotary valve body of claim 1, wherein, The two ends of the connecting channel (6) smoothly transition to the inlet channel (4) and the outlet channel (5), respectively.

8. The double rotary valve body of claim 1, wherein, The number of dual swirl channels is multiple.

9. A urea nozzle characterized by, Includes a double swirl valve body as described in any one of claims 1-8 and a nozzle plate (24) disposed on the second end face (12), wherein the nozzle plate (24) is provided with a nozzle (241) corresponding to the outlet groove (3).

10. The urea nozzle of claim 9, wherein, The minimum cross-sectional dimension of the outlet flow channel (5) of the dual swirl valve body is larger than the size of the nozzle (241) of the nozzle plate (24).

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