Urea nozzle

Abstract

The urea nozzle comprises a nozzle body, a ball valve and a spray pipe are arranged on the nozzle body, the ball valve is used for controlling communication of the nozzle body and the spray pipe, and the spray pipe is used for spraying a urea solution into a mixer. A valve seat of the ball valve is rotatably connected with the nozzle body, the rotation direction of the valve seat is around the axis direction of the valve seat, the spray pipe is hermetically connected with the valve seat and provided with a mounting section and a spraying section, the spraying section is provided with a spraying hole, and an included angle alpha is formed between the axis of the spraying hole and the axis of the mounting section. Urea jetted from the jet hole can generate thrust in the direction perpendicular to the axis of the installation section, the thrust acts on the jet pipe, and finally the jet pipe drives the valve seat to rotate. The spraying pipe and the valve seat rotate under the counter-acting force of the sprayed urea, the urea sprayed out of the spraying hole of the spraying pipe can be sprayed in the circumferential direction of the valve seat to fall to different positions of the mixer, a continuous low-temperature area does not exist in the mixer, and therefore the risk of crystallization is reduced.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a urea nozzle. Background Art

[0002] In the related art, the urea nozzle is fixed to the valve seat, and urea is sprayed directionally from the spray hole of the urea nozzle, and urea can only fall on a fixed position of the mixer.

[0003] Since urea evaporation absorbs a large amount of heat, the temperature of the location where the urea falls in the mixer drops sharply. Continuous urea injection causes crystallization at the location where the urea falls in the mixer.

[0004] Therefore, how to reduce the risk of crystallization in the mixer has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The present application proposes a urea nozzle for reducing the risk of crystallization in the mixer.

[0006] In order to achieve the above object, the present application provides a urea nozzle, including a nozzle body, on which a ball valve and a nozzle are arranged.

[0007] The valve seat of the ball valve is rotatably connected to the nozzle body, and the rotation direction of the valve seat is around its own axis.

[0008] The nozzle comprises a mounting section and an injection section, wherein the mounting section is sealed and connected to the valve seat, and the mounting section is coaxial with the valve seat, and the injection section is bent relative to the mounting section.

[0009] The injection section is provided with an injection hole on one side of the axial direction of the mounting section, and an angle α is formed between the axis of the injection hole and the axis of the mounting section, so that urea sprayed from the injection hole can generate a reverse thrust along a direction perpendicular to the axial direction of the mounting section, so as to push the injection section to rotate the valve seat, wherein 0<α≤90°.

[0010] Preferably, in the above urea nozzle, the valve seat is rotatably connected to the nozzle body via a bearing.

[0011] Preferably, in the above urea nozzle, an angle β is formed between the axis of the injection hole and the axis of the injection section, and 30°≤β≤90°.

[0012] Preferably, in the above urea nozzle, at least one injection hole is provided on the injection section along the axial direction of the injection section.

[0013] Preferably, in the above urea nozzle, along the circumferential direction of the mounting section, at least one injection section is provided on the mounting section.

[0014] The injection holes are arranged on the same side of two adjacent injection sections.

[0015] Preferably, in the above urea nozzle, the plurality of injection sections are staggered and distributed along the axial direction of the mounting section.

[0016] Preferably, in the above urea nozzle, the apertures of the injection holes of two adjacent injection sections are equal or unequal;

[0017] and / or,

[0018] The plurality of injection segments are evenly or unevenly distributed along the circumference of the installation segment.

[0019] Preferably, in the above urea nozzle, the valve seat is threadedly connected to the mounting section, and the tightening direction of the mounting section is the same as the rotation direction of the valve seat.

[0020] Preferably, in the above urea nozzle, the injection hole is provided on an end surface of the injection section away from the mounting section.

[0021] Preferably, in the above urea nozzle, the angle between the mounting section and the injection section is at least 80°.

[0022] The urea nozzle provided in the embodiment of the present application includes a nozzle body, a ball valve and a nozzle are arranged on the nozzle body, the ball valve is used to control the connection between the nozzle body and the nozzle, and the nozzle is used to spray urea solution into the mixer. The valve seat of the ball valve is rotatably connected to the nozzle body, the rotation direction of the valve seat is around its own axis direction, the nozzle is sealed and connected to the valve seat, the nozzle has a mounting section and an injection section, the injection section is provided with an injection hole, and there is an angle α between the axis of the injection hole and the axis of the mounting section, so that the urea sprayed from the injection hole can generate a reverse thrust in a direction perpendicular to the axis of the mounting section, and the reverse thrust acts on the nozzle, and finally the nozzle drives the valve seat to rotate. Under the reaction force of the sprayed urea, the nozzle and the valve seat rotate, so that the urea sprayed from the injection hole of the nozzle will be sprayed along the circumference of the valve seat and fall at different positions of the mixer, so that there will be no continuous low temperature area in the mixer, thereby reducing the risk of crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0024] Figure 1 is a cross-sectional view of a prior art urea nozzle;

[0025] Figure 2 is a cross-sectional view of the urea nozzle of the present application;

[0026] Figure 3 is a front view of the nozzle of the urea nozzle of the present application;

[0027] Figure 4 is a side view of the nozzle of the urea nozzle of the present application;

[0028] Figure 5 is a top view of the nozzle of the urea nozzle of the present application;

[0029] Figure 6 It is a schematic diagram of the structure of the urea nozzle of the present application having three injection sections.

[0030] The accompanying drawings are as follows:

[0031] 1-nozzle body; 2-nozzle pipe; 21-installation section; 22-injection section; 23-injection hole; 3-valve seat; 31-injection hole; 4-bearing; 5-housing; 6-sleeve; 7-nozzle straight pipe; 8-sealing valve ball. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It will be understood that the specific embodiments described herein are only used to explain the related application, rather than to limit the application. The described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0033] It should be noted that, for ease of description, only the parts related to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other, as long as the combined technical features are not contradictory. All feasible feature combinations are technical contents clearly recorded in this article. Any of the multiple sub-features contained in the same sentence can be applied independently, and does not have to be applied together with other sub-features.

[0034] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0035] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0036] Some related technologies, such as Figure 1 As shown, the urea nozzle includes a housing 5, a sleeve 6, a nozzle straight pipe 7, a valve seat 3 and a sealing valve ball 8. The cavity formed by the valve seat 3 and the sleeve 6 is used to contain a high-pressure urea solution. The housing 5 is provided with a mounting hole for the sleeve 6 to pass through. One end of the sleeve 6 is located inside the housing 5, and the other end of the sleeve 6 is located outside the housing 5 and is a free end. The valve seat 3 and the nozzle straight pipe 7 are installed inside the sleeve 6. The valve seat 3 is located at the free end of the sleeve 6. The valve seat 3 is provided with a spray hole 31. The sealing valve ball 8 is located between the nozzle straight pipe 7 and the valve seat 3. The sealing ball valve 8 moves upward, and the nozzle straight pipe 7 is connected to the spray hole 31. The sealing ball valve 8 moves downward, seals the spray hole 31, and blocks the connection between the nozzle straight pipe 7 and the spray hole 31. When the nozzle straight pipe 7 is connected to the spray hole 31, urea is sprayed through the spray hole 31. When the nozzle straight pipe 7 is not connected to the spray hole 31, urea cannot be sprayed through the spray hole 31.

[0037] In some embodiments, the urea nozzle includes a nozzle body 1 , on which a ball valve and a nozzle 2 are provided. The ball valve is used to control the connection between the nozzle body 1 and the nozzle 2 , and the nozzle 2 is used to spray the urea solution into the mixer.

[0038] Specifically, the valve seat 3 of the ball valve is rotatably connected to the nozzle body 1, the rotation direction of the valve seat 3 is around its own axis direction, and the nozzle 2 is sealed and connected to the valve seat 3. The valve seat 3 and the nozzle 2 rotate synchronously or asynchronously, but the valve seat 3 and the nozzle 2 rotate in the same direction, and the nozzle 2 also rotates around the axis direction of the valve seat 3.

[0039] In some embodiments, the nozzle body 1 may optionally include a housing 5, a sleeve 6, and a nozzle straight tube 7, the ball valve includes a valve seat 3 and a sealing valve ball 8, the valve seat 3 is rotatably connected to the sleeve 6 of the nozzle body 1, the valve seat 3 is communicated with the nozzle straight tube 7, a spray hole is provided on the valve seat 3, and the nozzle 2 is communicated with the valve seat 3 through the spray hole. Specifically, the sleeve 6 is sleeved outside the valve seat 3, and the outer wall of the valve seat 3 is rotatably connected to the inner wall of the sleeve 6.

[0040] like Figure 2 As shown, the nozzle 2 includes a mounting section 21 and an injection section 22, wherein the mounting section 21 is used to connect the nozzle 2 with the valve seat 3. Preferably, the mounting section 21 is coaxially arranged with the valve seat 3, the injection section 22 is connected with the mounting section 21 and is bent relative to the mounting section 21, and an injection hole 23 is provided on the injection section 22 for injecting urea. Specifically, the urea entering the nozzle body 1 enters the mounting section 21 and the injection section 22 in sequence after passing through the ball valve, and is finally injected through the injection hole 23 of the injection section 22.

[0041] In this solution, the rotational power of the valve seat 3 comes from the urea sprayed through the injection section 22. Specifically, there is an angle α between the axis of the injection hole 23 and the axis of the mounting section 21, and the angle α enables the high-pressure urea sprayed from the injection hole 23 to generate a reverse thrust in a direction perpendicular to the axis of the mounting section 21, and the reverse thrust acts on the nozzle 2, and finally the nozzle 2 drives the valve seat 3 to rotate 360°. Optionally, the angle α>0°, and the angle α≤90°.

[0042] The nozzle 2 and the valve seat 3 are driven to rotate by the reaction force of the injected urea, so that the urea sprayed from the injection hole 23 of the nozzle 2 is sprayed along the circumference of the valve seat 3 and falls on different positions of the mixer, so that there is no continuous low-temperature area in the mixer, thereby reducing the risk of crystallization.

[0043] As the nozzle 2 rotates, the injection points of urea in the mixer are more dispersed, forming a circle of low-temperature zone in the mixer. Compared with the method in which the injection position of the urea nozzle is fixed, the area of ​​the low-temperature zone in the mixer becomes larger, and the temperature drop in the low-temperature zone is reduced, thereby improving the temperature uniformity inside the mixer and reducing the risk of crystallization. At the same time, since the positions of urea injection in the mixer are dispersed, it is helpful to improve the uniformity of mixing urea and exhaust gas.

[0044] The rotation speed of the valve seat 3 is positively correlated with the urea injection amount. The greater the urea injection amount, the greater the reverse thrust generated and the faster the rotation speed of the valve seat 3.

[0045] Under the condition of the same urea injection flow rate, the diameter of the injection hole 23 can be reduced, the particle size of the urea after injection can be reduced, and the injection penetration distance after the urea is injected can be increased, which is more conducive to the atomization and mixing of urea and reduces the risk of hitting the wall. At the same time, the number of injection holes 23 can be increased to ensure the total amount of urea injected.

[0046] The injection hole 23 of the injection section 22 is arranged on one side of the axial direction of the mounting section 21 so that the reverse thrust generated by urea injection is concentrated on one side of the injection section 22, thereby improving the reliability of the urea injected from the injection hole pushing the valve seat 3 to rotate.

[0047] The rotational connection between the valve seat 3 and the nozzle body 1 may be achieved through a bearing 4, a slider and a slide groove, or other methods, which are not specifically limited here.

[0048] There is an angle β between the axis of the injection hole 23 and the axis of the injection section 22 (or there is an angle β between the axis of the injection hole 23 and the airflow direction), and the angle β is ≥ 30° and ≤ 90°.

[0049] The angle between the axis of the injection hole 23 and the airflow direction is an acute angle, which has little effect on the spraying of urea from the injection hole 23 , so that while ensuring the spraying of urea, urea can also apply a reverse thrust to the injection section 22 .

[0050] Along the axial direction of the injection section 22, the number of the injection hole 23 is at least one.

[0051] The number of the injection holes 23 is based on ensuring that the valve seat 3 can rotate. The more the number of injection holes 23 is, the greater the reaction force generated by urea injection is. On the contrary, the fewer the number of injection holes 23 is, the smaller the reaction force generated by urea injection is.

[0052] The reaction force generated by urea injection is affected not only by the number of the injection holes 23 but also by the hole diameters of the injection holes 23 and the shapes of the injection holes 23 .

[0053] In some embodiments, the shape of the injection hole 23 can be circular, elongated, polygonal, etc.

[0054] At least one injection segment 22 is provided along the circumferential direction of the mounting segment 21 .

[0055] In the embodiment where a plurality of injection segments 22 are arranged along the circumferential direction of the mounting segment 21 , injection holes 23 are provided on the same side of two adjacent injection segments 22 to prevent the reaction forces generated by the urea injection of the two adjacent injection segments 22 from weakening each other and reducing the reliability of the rotation of the valve seat 3 .

[0056] like Figure 6 As shown, it is an embodiment in which three injection sections 22 are arranged along the circumference of the mounting seat, and injection holes 23 are opened on the same side of two adjacent injection sections 22.

[0057] In the embodiment where at least two injection sections 22 are arranged in the circumferential direction of the installation section 21, the number of injection holes 23 opened on each injection section 22 may be equal or unequal;

[0058] The angle α between the axis of the injection hole 23 opened on each injection section 22 and the axis of the mounting section 21 may be equal or unequal;

[0059] The angle β between the axis of the injection hole 23 opened on each injection section 22 and the axis of the injection section 22 may be equal or unequal;

[0060] The shapes of the injection holes 23 opened on each injection section 22 may be the same or different;

[0061] The sizes of the injection holes 23 formed in each injection section 22 may be the same or different.

[0062] In the embodiment where at least two injection segments 22 are provided in the circumferential direction of the mounting segment 21 , the plurality of injection segments 22 are evenly or unevenly distributed along the circumference of the mounting segment 21 .

[0063] In an embodiment in which at least two injection sections 22 are arranged in the circumferential direction of the mounting section 21, the plurality of injection sections 22 are staggeredly distributed along the axial direction of the mounting section 21 to increase the area of ​​the low-temperature zone formed in the mixer. Urea injected by different injection sections 22 falls at different points in the mixer, and the temperature drop in the low-temperature zone is reduced, which is beneficial to reducing the risk of crystallization.

[0064] In some embodiments, since the pressure at each position in the injection section 22 is equal, the apertures of the plurality of injection holes 23 opened on the injection section 22 are equal.

[0065] In the embodiment where a plurality of injection holes 23 are provided in the axial direction of the injection section 22 , the plurality of injection holes 23 are arranged at equal or non-equal heights along the axis of the injection section 22 .

[0066] In some embodiments, the valve seat 3 is also rotatably connected to the mounting section 21, and the rotation direction of the nozzle 2 is around the axis of the mounting section 21. Specifically, the valve seat 3 and the nozzle 2 can both rotate to improve the reliability of the nozzle rotation.

[0067] In some embodiments, the valve seat 3 is fixedly connected to the mounting section 21. When the valve seat 3 and the mounting section 21 rotate synchronously, the mounting section 21 and the valve seat 3 do not move relative to each other. In this embodiment, the valve seat 3 is threadedly connected to the mounting section 21, which facilitates the replacement of a blocked nozzle 2. The tightening direction of the mounting section 21 is the same as the rotation direction of the valve seat 3 to prevent the connection position of the mounting section 21 and the valve seat 3 from loosening during the rotation process.

[0068] In some embodiments, the present application is not limited to opening the injection hole 23 on the side of the injection section 22, and the injection hole can also be opened on the end face of the injection section 22 away from the mounting section 21. The diameter of the injection hole opened on the end face of the injection section 22 is smaller than the diameter of the injection hole 23 opened on the side of the injection section 22, so as to reduce the influence on the pressure in the injection section 22 and ensure the reliability of the rotation of the nozzle 2.

[0069] The angle between the mounting section 21 and the injection section 22 is at least 80°. Preferably, the angle between the mounting section 21 and the injection section 22 is a right angle or an obtuse angle.

[0070] The angle between the installation section 21 and the injection section 22 can be an acute angle, a right angle or an obtuse angle. Preferably, the angle between the installation section 21 and the injection section 22 is a right angle or an obtuse angle to facilitate the installation of the nozzle 2.

[0071] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used, and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. The scope of application involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned application concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in this application (but not limited to) to form a technical solution.

Claims

1. A urea nozzle, characterized in that: The nozzle body (1) comprises a nozzle body, on which a ball valve and a nozzle pipe (2) are arranged. The valve seat (3) of the ball valve is rotatably connected to the nozzle body (1), and the rotation direction of the valve seat (3) is around its own axis. The nozzle (2) comprises a mounting section (21) and an injection section (22); the mounting section (21) is sealedly connected to the valve seat (3), and the mounting section (21) and the valve seat (3) are coaxial; the injection section (22) is bent relative to the mounting section (21). The injection section (22) is provided with an injection hole (23) on one side of the axial direction of the mounting section (21); an included angle α is formed between the axis of the injection hole (23) and the axis of the mounting section (21), so that urea sprayed from the injection hole (23) can generate a reverse thrust in a direction perpendicular to the axial direction of the mounting section (21), so as to push the injection section (22) to rotate the valve seat (3), wherein 0<α≤90°.

2. The urea nozzle according to claim 1, characterized in that: The valve seat (3) is rotatably connected to the nozzle body (1) via a bearing (4).

3. The urea nozzle according to claim 1, characterized in that: An included angle β is formed between the axis of the injection hole (23) and the axis of the injection section (22), and the angle is 30°≤β≤90°.

4. The urea nozzle according to claim 1, characterized in that: At least one injection hole (23) is provided on the injection section (22) along the axial direction of the injection section (22).

5. The urea nozzle according to claim 1, characterized in that: At least one injection section (22) is provided on the installation section (21) along the circumferential direction of the installation section (21). The injection hole (23) is provided on the same side of two adjacent injection sections (22).

6. The urea nozzle according to claim 5, characterized in that: The plurality of injection sections (22) are staggeredly distributed along the axial direction of the installation section (21).

7. The urea nozzle according to claim 5, characterized in that: The apertures of the injection holes (23) of two adjacent injection sections (22) are equal or unequal; and / or, The plurality of injection sections (22) are evenly or unevenly distributed along the circumference of the installation section (21).

8. The urea nozzle according to claim 1, characterized in that: The valve seat (3) is threadedly connected to the mounting section (21), and the tightening direction of the mounting section (21) is the same as the rotation direction of the valve seat (3).

9. The urea nozzle according to claim 1, characterized in that: The injection hole is arranged on the end surface of the injection section (22) away from the mounting section (21).

10. The urea nozzle according to claim 1, characterized in that: The angle between the mounting section (21) and the injection section (22) is at least 80°.

Images