Nozzle device for exhaust gas aftertreatment system and exhaust gas aftertreatment system
By combining the swirl orifice plate and the pre-swirling component, the problems of complex structure and non-dispersive spray in existing nozzle devices are solved, achieving simple and efficient swirl jetting and uniform mixing, and preventing clogging and valve seat cracking.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BOSCH POWERTRAIN SYSTEMS CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-06-23
AI Technical Summary
Existing nozzle devices have complex structures, and the spray is not sufficiently dispersed, making it difficult to achieve uniform swirling spray.
The system employs a combination structure of a swirling orifice plate and a pre-swirling component. The swirling orifice plate is equipped with a guide groove and spray holes, while the pre-swirling component induces pre-swirling flow upstream. Combined with a shut-off valve and a solenoid valve to control the flow path, it achieves two-stage swirling jet.
It achieves a simple swirling jet, prevents residual droplets from clogging the nozzle, avoids valve seat cracking caused by liquid freezing and crystallization, and improves the dispersion and mixing uniformity of the spray.
Smart Images
Figure CN224396563U_ABST
Abstract
Description
Technical Field
[0001] This application relates to a nozzle device for an exhaust gas aftertreatment system and an exhaust gas aftertreatment system. More particularly, this application relates to a nozzle device for injecting urea. Background Technology
[0002] Exhaust gas aftertreatment systems include nozzle devices, particularly those for spraying urea or other treatment liquids. To ensure uniform mixing of the spray with the exhaust gas, current mainstream nozzle devices typically incorporate a swirling element and a jetting element to generate a swirling flow. The swirling element has, for example, a rotating groove on its end face facing the jetting element to achieve the swirling flow. The jetting element covers the groove of the swirling element and has a central spray orifice. Existing nozzle devices have a relatively complex structure for generating swirling flows, and the sprayed mist is not sufficiently dispersed. Utility Model Content
[0003] The purpose of this application is to provide a nozzle device for an exhaust gas aftertreatment system, particularly one that enables simple swirl injection.
[0004] According to a first aspect of this application, a nozzle device for an exhaust gas aftertreatment system is provided, characterized in that the nozzle device includes a swirling orifice plate, the swirling orifice plate having:
[0005] A swirling structure is provided on a first side of the swirling orifice plate, the swirling structure being adapted to induce a swirling flow of the fluid to be ejected, the first side facing the interior of the nozzle device;
[0006] A nozzle extends from a first side of the swirling orifice plate to a second side opposite to the first side, allowing fluid swirled by the swirling structure to be ejected outward through the nozzle.
[0007] According to an optional embodiment of this application, the swirling structure includes a plurality of guide grooves distributed around the central axis of the orifice plate of the swirling orifice plate, the depth of each of the plurality of guide grooves increasing along the same rotational direction about the central axis of the orifice plate to cause swirling along that rotational direction; and / or, the nozzle includes a plurality of nozzles distributed around the central axis of the orifice plate of the swirling orifice plate; and / or, the nozzle device includes a pre-swirling component upstream of the swirling orifice plate, such that the fluid to be injected flows towards the swirling orifice plate after being pre-swirled by the pre-swirling component; and / or, the nozzle device includes a pre-swirling component upstream of the swirling orifice plate. A shut-off valve upstream of the orifice plate, the shut-off valve comprising a first closing body, a first valve seat surface, and a first spring, the first spring pre-tightening the first closing body to the first valve seat surface in a pre-tightening force direction opposite to the main flow direction of fluid flowing into the orifice plate within the nozzle device; and / or, the nozzle device comprising a solenoid valve upstream of the orifice plate to selectively cut off or connect the flow path to the orifice plate; and / or, the thickness of the orifice plate being between 0.1 mm and 0.3 mm; and / or, the nozzle device being a nozzle device for spraying liquid.
[0008] According to an optional embodiment of this application, in projection along the direction of the central axis of the orifice plate of the swirling orifice plate, the plurality of guide grooves are each approximately fan-shaped; and / or, the swirling orifice plate has a first central frustum surrounded by the plurality of guide grooves on the first side; and / or, the pre-swirling component is adapted to generate a swirling flow in the same direction as the swirling flow caused by the swirling structure; and / or, the pre-swirling component has a plurality of pre-swirling channels distributed around the component's central axis, the pre-swirling channels having at least a channel outflow section adjacent to the channel outlet of the pre-swirling channel relative to the component's central axis. The line is tilted to generate swirl; and / or, in the assembled state, the central axis of the orifice plate of the swirl orifice plate is coaxial with the central axis of the component of the pre-swirl component; and / or, the pre-swirl component has a receiving groove for receiving the first spring; and / or, the solenoid valve is located upstream of the shut-off valve; and / or, the pre-swirl component is located between the shut-off valve and the swirl orifice plate; and / or, the nozzle device includes a valve seat body, on which a first valve seat surface of the shut-off valve is formed on a first end face, and on which a second valve seat surface of the solenoid valve is formed on a second end face; and / or, the liquid is urea.
[0009] According to an optional embodiment of this application, the channel outlet of each of the plurality of pre-swirling channels is aligned with the inlet end of a corresponding guide groove among the plurality of guide grooves; and / or, the plurality of pre-swirling channels are fan-shaped; and / or, the channel outlets of the plurality of pre-swirling channels are respectively generally fan-shaped and separated from each other by spacers; and / or, the bottom surface of the pre-swirling component facing the swirling orifice plate has an annular vent groove communicating with the channel outlets of the plurality of pre-swirling channels and a second central frustum surrounded by the annular vent groove, wherein in the assembled state, the second central frustum is supported on the first central frustum; and / or, the pre-swirling component has a bottom wall defining the receiving groove, a boss is provided at the center of the bottom wall, and the plurality of pre-swirling channels pass through the boss and the bottom wall.
[0010] According to an optional embodiment of this application, the pre-swirl component has a directional portion, and the swirl orifice plate has a mating directional portion for cooperating with the directional portion, wherein the directional portion and the mating directional portion achieve the alignment in a mutually cooperating state; and / or, the channel inflow section of the plurality of pre-swirl channels located in the boss is open radially outward; and / or, in the assembled state, the first spring surrounds the boss.
[0011] According to an optional embodiment of this application, the directional portion is configured as a directional protrusion, and the paired directional portion is configured as a directional slot; the directional protrusion includes a pair of mirror-symmetrical directional protrusions, and the directional slot includes a pair of mirror-symmetrical directional slots.
[0012] According to an optional embodiment of this application, the plurality of guide channels are adjacent to each other and together form a ring; and / or, the plurality of guide channels each include a bottom surface, two side surfaces, and an end surface located at the end along the direction of rotation.
[0013] According to an optional embodiment of this application, the bottom surface of the trough is fan-shaped; and / or, the width of the bottom surface of the trough decreases along the rotation direction; and / or, the plurality of guide troughs each have a spray hole, the spray hole penetrating the bottom surface of the trough adjacent to the end face of the trough.
[0014] According to an optional embodiment of this application, the swirling orifice plate has a thickness reduction groove on the second side, the thickness reduction groove being disposed in the outlet region of the nozzle to reduce the thickness of the swirling orifice plate at the outlet region, the thickness reduction groove being annular; and / or, the nozzle extending obliquely outward in a direction viewed from the inside to the outside of the nozzle device; and / or, the nozzle being a cylindrical nozzle.
[0015] According to a second aspect of this application, an exhaust gas aftertreatment system is provided, characterized in that the exhaust gas aftertreatment system includes the aforementioned nozzle device for an exhaust gas aftertreatment system.
[0016] At least in some embodiments, the positive effects of this application are: it can achieve swirling jet with a simple structure; it can achieve two-stage swirling; it can prevent residual droplets from clogging the nozzle; and it can prevent the valve seat from cracking due to liquid freezing and crystallization. Attached Figure Description
[0017] The principles, features, and advantages of this application will be better understood below with reference to the accompanying drawings. The drawings include:
[0018] Figure 1 The illustration shows a partial example of a nozzle assembly used in an exhaust aftertreatment system.
[0019] Figure 2 An example of the first side of a swirling orifice plate is shown schematically in a front view.
[0020] Figure 3 A three-dimensional diagram is shown schematically. Figure 2 An example of a second side of a swirl plate opposite to the first side.
[0021] Figure 4 A three-dimensional diagram is shown schematically. Figure 2 The first side of the swirling orifice plate.
[0022] Figure 5 A three-dimensional diagram schematically illustrates an example of a swirl orifice plate and a pre-swirl component assembled together.
[0023] Figure 6 An example of a swirl orifice plate and a pre-swirl component assembled together is shown in a three-dimensional sectional view.
[0024] Figure 7 An example of the bottom surface of a pre-swirling component facing the swirling orifice plate is shown schematically.
[0025] Figure 8 An example of a pre-swirling component is shown schematically in a three-dimensional diagram.
[0026] Figure 9 An example of the area of the receiving groove of the pre-swirling component is schematically shown in part. Detailed Implementation
[0027] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit the scope of protection of this application.
[0028] Figure 1 A partial example of a nozzle assembly for an exhaust aftertreatment system is schematically shown. The exhaust aftertreatment system is, for example, an exhaust aftertreatment system for a vehicle, particularly a commercial vehicle. The nozzle assembly is, for example, a nozzle assembly for injecting urea. The exhaust aftertreatment system may also include a urea pump, a urea solution tank, and / or a catalytic converter, etc. The basic components of an exhaust aftertreatment system are well known to those skilled in the art and will not be described further here. The improvements in this application mainly relate to the nozzle assembly.
[0029] like Figure 1 As shown, exemplarily, the nozzle device may include a swirl orifice plate 1 for realizing the swirling jetting of the fluid to be sprayed. In particular, based on the centrifugal force caused by the swirling, the swirling jetting of the fluid can make the spray uniformly mixed and refine the atomized particles, thereby improving the reaction efficiency.
[0030] like Figure 1 As shown, the swirl orifice plate 1 is the last component of the nozzle assembly related to spraying, and thus it has a decisive influence on the spray.
[0031] Figure 2 An example of the first side 11 of the swirl orifice plate 1 is shown schematically in a front view.
[0032] Figure 3 A three-dimensional diagram is shown schematically. Figure 2 An example of the second side 12 of the swirl plate 1 opposite to the first side 11.
[0033] Figure 4 A three-dimensional diagram is shown schematically. Figure 2 The first side surface 11 of the swirl orifice plate 1.
[0034] See Figures 1 to 4 In this application, the swirl plate 1 has:
[0035] A swirling structure 10 is provided on the first side 11 of the swirling orifice plate 1, the swirling structure 10 being adapted to cause a swirling flow of the fluid to be ejected, the first side 11 facing the interior of the nozzle device;
[0036] The nozzle 13 extends from the first side 11 of the swirling orifice plate 1 to the second side 12 opposite to the first side 11, allowing the fluid swirled by the swirling structure 10 to be ejected outward through the nozzle 13.
[0037] The advantages here are particularly evident in the simple structure, especially the generation of swirling flow with a single swirling orifice plate 1; the flat, plate-like structure of the swirling orifice plate 1 results in a very small dimension of the nozzle 13 along the central axis 17 of the orifice plate, thereby greatly reducing the converging effect of the nozzle 13 on the fluid, or in other words, the sprayed fluid has a very high degree of divergence. Regarding the converging effect, for example, when the nozzle 13 is long, the fluid will be guided by the nozzle 13 into a line, rather than being so divergent.
[0038] For example, the thickness of the swirl plate 1 can be between 0.1 mm and 0.3 mm.
[0039] For example, such as Figure 2 and Figure 4 As shown, the swirling structure 10 may include a plurality of guide grooves 110 distributed around the central axis 17 of the orifice plate 1. The depth of each of the plurality of guide grooves 110 increases along the same rotation direction 14 around the central axis 17 of the orifice plate, thereby causing swirling along the rotation direction 14.
[0040] Instead of the recessed guide groove 110, the swirling structure 10 may also include a protruding guide structure on the first side 11 or a combination of the recessed guide groove 110 and the protruding guide structure.
[0041] Swirling flow can be understood in particular as having at least a rotational flow component that is approximately about the central axis of the nozzle assembly.
[0042] Exemplarily, the nozzle 13 comprises a plurality of nozzles 13 distributed around the central axis 17 of the orifice plate 1. This improves the dispersion of the spray. The nozzles 13 are exemplary cylindrical.
[0043] For example, such as Figure 2 As shown, in projection along the central axis 17 of the orifice plate 1, the plurality of guide grooves 110 can each be approximately fan-shaped. The plurality of guide grooves 110 can, in particular, be adjacent to each other and form an annular shape. Alternatively, the plurality of guide grooves 110 can also be spaced apart from each other.
[0044] For example, such as Figure 2 As shown, the swirling orifice plate 1 may have a first central frustum 111 surrounded by the plurality of guide grooves 110 on the first side surface 11. The first central frustum 111 may be flush with the main plane 116 of the first side surface 11.
[0045] For example, such as Figure 4 As shown, the plurality of guide channels 110 each include a channel bottom surface 113, two channel side surfaces 114, and a channel end surface 115 located at the end along the rotation direction 14. The starting edge 1130 of the channel bottom surface 113 can be flush with the main plane 116 of the first side surface 11.
[0046] For example, see Figure 2 The bottom surface 113 of the channel is particularly fan-shaped. The width of the bottom surface 113 can be reduced along the direction of rotation 14. Each of the plurality of guide channels 110 may have a nozzle 13, which penetrates the bottom surface 113 adjacent to the end face 115 of the channel. The end face 115 of the channel extends particularly parallel to the central axis 17 of the orifice plate.
[0047] For example, such as Figure 3 As shown, the swirling orifice plate 1 has a thickness-reducing groove 16 on the second side surface 12. The thickness-reducing groove 16 is provided in the outlet region of the nozzle 13 to reduce the thickness of the swirling orifice plate 1 in the outlet region. This increases the dispersion of the spray ejected from the nozzle 13. The thickness-reducing groove 16 is particularly annular, which facilitates processing. Obviously, it is also possible to omit the thickness-reducing groove 16.
[0048] For example, such as Figure 2 As shown, when viewed from the inside to the outside of the nozzle device, the nozzle orifice 13 extends obliquely outward. This creates a cone-shaped spray overall.
[0049] Figure 5 A perspective view schematically illustrates an example of the swirling orifice plate 1 and the pre-swirling component 2 assembled together. Here, the pre-swirling component 2 is cut in half to provide clarity. Here, the exemplary flow direction of the fluid is shown in dashed lines.
[0050] Figure 6 An example of the swirl orifice plate 1 and the pre-swirl component 2 assembled together is shown in a three-dimensional sectional view. Here, both components are cut open.
[0051] Figure 7 An example of the bottom surface 29 of the pre-swirling component 2 facing the swirling orifice plate 1 is shown schematically.
[0052] Figure 8 An example of the pre-swirling component 2 is shown schematically in a three-dimensional view.
[0053] For example, such as Figures 5 to 8As shown, the nozzle assembly may include a pre-swirling component 2 upstream of the orifice plate 1, such that the fluid to be injected flows towards the orifice plate 1 after being pre-swirled by the pre-swirling component 2. The pre-swirling component 2 specifically induces a pre-swirling flow in the fluid that would otherwise flow substantially in the main flow direction 7. The pre-swirling component 2 should be understood, in particular, as a component independent of the orifice plate 1. Because the orifice plate 1 is typically made very thin to allow for spray dispersion, the swirling effect it can produce may be limited. By introducing the pre-swirling component 2, the swirling effect is greatly enhanced.
[0054] Clearly, the pre-swirling component 2 should generate a swirling flow in the same direction as the swirling flow caused by the swirling structure 10. This enhances the swirling effect.
[0055] Furthermore, in the assembled state, the central axis 17 of the orifice plate 1 is coaxial with the central axis 28 of the pre-swirl component 2. Both are also coaxial with the central axis of the nozzle assembly.
[0056] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, exemplarily, the pre-swirl component 2 has a plurality of pre-swirl channels 20 distributed around the component central axis 28 of the pre-swirl component 2, the pre-swirl channels 20 having at least a channel outflow section 201 adjacent to the channel outlet 200 of the pre-swirl channel 20 (see...). Figure 6 The pre-swirling channels 20 are inclined relative to the central axis 28 of the component to generate swirl. Here, the plurality of pre-swirling channels 20 are in particular fan-shaped.
[0057] For example, such as Figure 5 As shown, the channel outlet 200 of each of the plurality of pre-swirling channels 20 is aligned with the inlet end 112 of a corresponding guide channel 110 among the plurality of guide channels 110. Thus, the pre-swirled fluid then undergoes secondary swirling via the guide channel 110. The inlet end 112 can be understood, for example, as the guide channel 110 being located upstream in the direction of rotation 14, at the first third, first quarter, or first fifth.
[0058] For example, such as Figure 7 As shown, the channel outlets 200 of the plurality of pre-swirling channels 20 are generally fan-shaped and separated from each other by spacers 22. The channel outlets 200 of the pre-swirling channels 20 specifically correspond only to the inlet ends 112 of the corresponding guide channels 110.
[0059] For example, see Figure 4 and Figure 8The pre-swirling component 2 has a directional portion 27, and the swirling orifice plate 1 has a mating directional portion 15 for cooperating with the directional portion 27. The directional portion 27 and the mating directional portion 15 achieve alignment when they are in mutual cooperation. The directional portion 27 can be constructed as a directional protrusion, and the mating directional portion 15 can be constructed as a directional slot, but the reverse is also possible. For example, see... Figure 4 and Figure 8 The directional protrusions include a pair of mirror-symmetrical directional protrusions, and the directional slots include a pair of mirror-symmetrical directional slots. However, other numbers of directional protrusions and directional slots are also possible.
[0060] For example, such as Figure 8 As shown, the bottom surface 29 of the pre-swirl component 2 facing the swirl orifice plate 1 has an annular venting groove 23 communicating with the channel outlet 200 of the plurality of pre-swirl channels 20, and a second central frustum 24 surrounded by the annular venting groove 23. See also Figure 6 In the assembled state, the second central frustum 24 is supported on the first central frustum 111. The annular venting groove 23 facilitates complete circulation and thus enhances the swirling effect.
[0061] In addition to the swirl orifice plate 1 and the pre-swirl component 2, exemplarily, such as Figure 1 As shown, the nozzle device may include a shut-off valve 3 upstream of the swirling orifice plate 1. The shut-off valve 3 includes a first closing body 31, a first valve seat surface 61, and a first spring 30. The first spring 30 pre-tightens the first closing body 31 onto the first valve seat surface 61 in a pre-tightening force direction opposite to the main flow direction 7 of the fluid flowing towards the swirling orifice plate 1 within the nozzle device. Specifically, when there is no fluid, the shut-off valve 3 is normally closed due to the first spring 30. When a fluid with a pressure higher than a certain value is present, the fluid resists the pre-tightening force of the first spring 30, causing the first closing body 31 to disengage from the first valve seat surface 61 for injection. The first closing body 31 is exemplarily a sphere, but may also be a cone or something similar.
[0062] After the injection process of the injection device is completed, urea solution will remain in the injection chamber. The urea solution will drip slowly, and during the cooling process of the air in the exhaust pipe at high temperature, urea may dry and crystallize, causing blockage of the nozzle 13 of the swirl plate 1. The dripping problem can be avoided after the injection is completed by the shut-off valve 3. In addition, the volume expansion of urea in the injection chamber due to freezing at low temperature can also be supported by the compression of the first spring 30.
[0063] like Figure 1 As shown, the pre-swirling component 2 is located between the shut-off valve 3 and the swirling orifice plate 1.
[0064] For example, such as Figure 1 , Figure 5 and Figure 6 As shown, the pre-swirl component 2 has a receiving groove 21 for accommodating the first spring 30. Thus, the first spring 30 presses the pre-swirl component 2 against the swirl orifice plate 1.
[0065] See Figure 5 The pre-swirl component 2 may have a bottom wall 25 defining the receiving groove 21. A boss 26 may be provided at the center of the bottom wall 25. This boss 26 can be used for positioning the first spring 30, such that the first spring 30 surrounds the boss 26 in the assembled state. On the other hand, the plurality of pre-swirl channels 20 can be formed in the boss 26, thereby allowing the pre-swirl component 2 to provide sufficient longitudinal length along the component's central axis 28 for the design of the pre-swirl channels 20. The pre-swirl channels 20 also penetrate the bottom wall 25.
[0066] Figure 9 An example of a region of the receiving groove 21 of the pre-swirling component 2 is schematically shown in part.
[0067] For example, such as Figure 9 As shown, to facilitate fluid entry into the pre-swirling channels 20, the channel inflow sections 202 located in the bosses 26 of the plurality of pre-swirling channels 20 are open radially outward. This facilitates fluid entry into the pre-swirling channels 20.
[0068] For example, such as Figure 1 As shown, the nozzle device includes a solenoid valve 8 upstream of the swirling orifice plate 1 to selectively cut off or connect the flow path to the swirling orifice plate 1. Here, the solenoid valve 8 is located upstream of the shut-off valve 3.
[0069] The solenoid valve 8 may include, in particular, a second valve seat surface 62, a second closing body 80, an armature 81, and an electromagnet assembly 82. The second closing body 80 is exemplarily a ball. Exemplarily, the second closing body 80 is welded to the armature 81. When not energized, a second spring 83 presses the second closing body 80 against the second valve seat surface 62 via the armature 81, thereby forming a normally closed, sealed state. When the electromagnet assembly 82 is energized, the electromagnet assembly 82 generates an attractive force on the armature 81. This attractive force resists the preload of the second spring 83, causing the second closing body 80 to disengage from the second valve seat surface 62, thereby opening the solenoid valve 8 and allowing urea solution to enter.
[0070] For example, such as Figure 1As shown, the nozzle device includes a valve seat body 6, on which a first valve seat surface 61 of the shut-off valve 3 is formed on a first end face, and on which a second valve seat surface 62 of the solenoid valve 8 is formed on a second end face.
[0071] Furthermore, the nozzle assembly may also include a nozzle base 91 for receiving the swirling orifice plate 1. It is conceivable that the lower part of the swirling orifice plate 1 is welded to the nozzle base 91. Additionally, the nozzle base 91 may be threadedly connected to the valve seat body 6.
[0072] In addition, the nozzle assembly may also include a nozzle housing 90. The nozzle housing 90 may be used to accommodate the valve seat 6 and at least partially accommodate the solenoid valve 8.
[0073] The following describes the spraying process, shutdown process, and shutdown status of the nozzle device.
[0074] Injection process: When there is an injection demand, the high-pressure urea solution enters through the upper opening and reaches the upper part of the second closing body 80; the electromagnet assembly 82 receives the opening signal, and the electromagnetic force overcomes the spring force of the second spring 83 to lift the armature 81, thereby lifting the second closing body 80 as well. At this time, the high-pressure urea solution reaches the upper part of the first closing body 31 inside the valve seat 6; when the downward pressure of the high-pressure urea solution acting on the first closing body 31 is greater than the spring force of the lower first spring 30, the first closing body 31 opens. The high-pressure urea solution enters the pre-swirling component 2, passes through the channel outlet 200 of the pre-swirling component 2 and the swirling structure 10 of the swirling orifice plate 1, and reaches the nozzle 13 of the swirling orifice plate 1 for injection.
[0075] Closing Process: When the electromagnet receives the closing signal, the electromagnetic force disappears, and the downward spring force of the second spring 83 acts on the armature 81, simultaneously driving the second closing body 80 downward, thus closing the second closing body 80; consequently, the fluid pressure above the first closing body 31 decreases. When the fluid pressure above the first closing body 31 is less than the upward spring force of the lower first spring 30, the first closing body 31 moves upward to close, at which point the jetting stops, and the residual liquid above is blocked by the first closing body 31, preventing it from reaching the vortex orifice plate 1, thereby reducing the risk of crystallization and blockage of the vortex orifice plate 1.
[0076] Shutdown state: Especially in low temperature environments, after shutdown, the residual low-pressure urea solution in the inner cavity of valve seat 6 will expand in volume (7%) due to freezing and crystallization. This expansion volume can be compensated by the compression of the first spring 30, thus preventing valve seat 6 from cracking.
[0077] In this context, "multiple" is understood as two or more. "First," "second," etc., are only used to avoid confusion of elements and do not serve any other limiting function.
[0078] The dimensions, quantity, position, shape, and interrelationships of the elements in the accompanying drawings should be understood as examples, not as absolute limitations of this application. Those skilled in the art can also conceive of simple variations in the dimensions, quantity, position, shape, and interrelationships of these elements without departing from the scope of protection of this application.
[0079] In the accompanying drawings, there are multiple elements that have the same function. Sometimes only some of them are labeled as examples, but those skilled in the art can identify the other elements that have the same function without any doubt by the similarity between the shapes of these elements.
[0080] Provided that it is permissible in principle, each of the cited features can be considered as an individual feature and can be combined with any other feature in any form without departing from the scope of protection of this application. If it is permissible in principle, even if not explicitly stated, a feature described for one embodiment should be considered as being arbitrarily applicable to other embodiments.
[0081] Although specific embodiments of this application are described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of this application. Various substitutions, modifications, and alterations can be conceived without departing from the spirit and scope of this application.
[0082] Figure Labels
[0083] 1. Swirl orifice plate
[0084] 10 Swirl Structure
[0085] 11 First side view
[0086] 110 guide channel
[0087] 111 First Central Frustum
[0088] 112 entrance terminal
[0089] 113 bottom surface
[0090] 1130 starting edge
[0091] 114 slot side
[0092] 115 slot end face
[0093] 116 Main Plane
[0094] 12 Second side
[0095] 13 nozzles
[0096] 14 Rotation direction
[0097] 15 Pairing Orientation Section
[0098] 16 Thickness Reduction Groove
[0099] 17-hole plate centerline
[0100] 2 Pre-swirl component
[0101] 20 pre-swirl channels
[0102] 200 Channel Exits
[0103] 201 Channel Outflow Section
[0104] 202 Channel Inflow Section
[0105] 21 Reservoir
[0106] 22 intervals
[0107] 23 Annular Ventilation Slots
[0108] 24 Second Central Frustum
[0109] 25 bottom wall
[0110] 26 bosses
[0111] 27 Orientation Department
[0112] 28 component centerlines
[0113] 29 parts bottom surface
[0114] 3. Shut-off valve
[0115] 30 First Spring
[0116] 31 First Closed Body
[0117] 5 bases
[0118] 6 Valve seat body
[0119] 61 First valve seat surface
[0120] 62 Second valve seat surface
[0121] 7. Main flow direction
[0122] 8 Solenoid Valves
[0123] 80 Second Closed Body
[0124] 81 Armature
[0125] 82 Electromagnet Assembly
[0126] 83 Second Spring
[0127] 90 Nozzle Housing
[0128] 91 Nozzle Base
Claims
1. A nozzle device for an exhaust gas aftertreatment system, characterized in that, The nozzle device includes a swirling orifice plate (1), which has: A swirling structure (10) is provided on a first side (11) of the swirling orifice plate (1), the swirling structure (10) being adapted to cause a swirling flow of the fluid to be ejected, the first side (11) facing the interior of the nozzle device; The nozzle (13) extends from the first side (11) of the swirling orifice plate (1) to the second side (12) opposite to the first side (11), allowing the fluid swirled by the swirling structure (10) to be ejected outward through the nozzle (13).
2. The nozzle device for an exhaust gas aftertreatment system according to claim 1, characterized in that, The swirling structure (10) includes a plurality of guide grooves (110) distributed around the central axis (17) of the orifice plate (1), the depth of each of the plurality of guide grooves (110) increasing along the same rotational direction (14) about the central axis (17) of the orifice plate to cause swirling along that rotational direction (14); and / or The nozzles (13) include a plurality of nozzles (13) distributed around the central axis (17) of the orifice plate surrounding the swirling orifice plate (1); and / or The nozzle assembly includes a pre-swirling component (2) upstream of the swirling orifice plate (1) such that the fluid to be injected flows towards the swirling orifice plate (1) after being pre-swirled by the pre-swirling component (2); and / or The nozzle device includes a shut-off valve (3) upstream of the swirling orifice plate (1). The shut-off valve (3) includes a first closing body (31), a first valve seat (61), and a first spring (30). The first spring (30) pre-tightens the first closing body (31) onto the first valve seat (61) in a pre-tightening force direction, the pre-tightening force direction being opposite to the main flow direction (7) of the fluid flowing through the nozzle device toward the swirling orifice plate (1); and / or The nozzle device includes a solenoid valve (8) upstream of the swirling orifice plate (1) to selectively cut off or connect the flow path to the swirling orifice plate (1); and / or The thickness of the swirl plate (1) is between 0.1 mm and 0.3 mm; and / or The nozzle device is a nozzle device used for spraying liquid.
3. The nozzle device for an exhaust gas aftertreatment system according to claim 2, characterized in that, Viewed in projection along the direction of the central axis (17) of the orifice plate (1), the plurality of guide grooves (110) are approximately fan-shaped; and / or The swirling orifice plate (1) has a first central frustum (111) on the first side (11) surrounded by the plurality of guide grooves (110); and / or The pre-swirling component (2) is adapted to generate a swirling flow in the same direction as the swirling flow caused by the swirling structure (10); and / or The pre-swirling component (2) has a plurality of pre-swirling channels (20) distributed around the component's central axis (28), wherein the pre-swirling channels (20) are inclined relative to the component's central axis (28) at least in their channel outlet (200) adjacent to the channel outlet (200) to generate swirl; and / or In the assembled state, the central axis (17) of the orifice plate (1) is coaxial with the central axis (28) of the pre-swirl component (2); and / or The pre-swirl component (2) has a receiving groove (21) for receiving the first spring (30); and / or The solenoid valve (8) is located upstream of the shut-off valve (3); and / or The pre-swirling component (2) is located between the shut-off valve (3) and the swirling orifice plate (1); and / or The nozzle device includes a valve seat body (6), on which a first valve seat surface (61) of the shut-off valve (3) is formed on a first end face, and on which a second valve seat surface (62) of the solenoid valve (8) is formed on a second end face; and / or The liquid is urea.
4. The nozzle device for an exhaust gas aftertreatment system according to claim 3, characterized in that, The channel outlet (200) of each of the plurality of pre-swirling channels (20) is aligned with the inlet end (112) of a corresponding guide channel (110) among the plurality of guide channels (110); and / or The plurality of pre-swirling channels (20) are fan-shaped; and / or The channel outlets (200) of the plurality of pre-swirling channels (20) are generally fan-shaped and separated from each other by spacers (22); and / or The bottom surface (29) of the pre-swirl component (2) facing the swirl orifice plate (1) has an annular vent groove (23) communicating with the channel outlet (200) of the plurality of pre-swirl channels (20) and a second central frustum (24) surrounded by the annular vent groove (23). In the assembled state, the second central frustum (24) is supported on the first central frustum (111); and / or The pre-swirling component (2) has a bottom wall (25) that defines the receiving groove (21), and a boss (26) is provided at the center of the bottom wall (25). The plurality of pre-swirling channels (20) pass through the boss (26) and the bottom wall (25).
5. The nozzle device for an exhaust gas aftertreatment system according to claim 4, characterized in that, The pre-swirling component (2) has a directional part (27), and the swirling orifice plate (1) has a mating directional part (15) for cooperating with the directional part (27). The directional part (27) and the mating directional part (15) achieve the alignment when they cooperate with each other; and / or The channel inflow section (202) of the plurality of pre-swirling channels (20) located in the boss (26) is open radially outward; and / or In the assembled state, the first spring (30) surrounds the boss (26).
6. The nozzle device for an exhaust gas aftertreatment system according to claim 5, characterized in that, The directional part (27) is constructed as a directional protrusion, and the mating directional part (15) is constructed as a directional groove; The directional protrusions include a pair of mirror-symmetrical directional protrusions, and the directional slots include a pair of mirror-symmetrical directional slots.
7. The nozzle device for an exhaust gas aftertreatment system according to claim 2, characterized in that, The plurality of guide channels (110) are adjacent to each other and together form a ring; and / or The plurality of guide channels (110) each include a bottom surface (113), two side surfaces (114), and an end surface (115) located at the end along the rotation direction (14).
8. The nozzle device for an exhaust gas aftertreatment system according to claim 7, characterized in that, The bottom surface (113) of the groove is fan-shaped; and / or Along the rotation direction (14), the width of the groove bottom surface (113) decreases; and / or The plurality of guide channels (110) each have a spray hole (13), and the spray hole (13) passes through the bottom surface (113) of the channel adjacent to the end face (115) of the channel.
9. The nozzle device for an exhaust gas aftertreatment system according to any one of claims 1 to 8, characterized in that, The swirling orifice plate (1) has a thickness reduction groove (16) on the second side surface (12), the thickness reduction groove (16) being disposed in the outlet region of the nozzle (13) to reduce the thickness of the swirling orifice plate (1) at the outlet region, the thickness reduction groove (16) being annular; and / or The nozzle orifice (13) extends obliquely outward when viewed from the inside to the outside of the nozzle device; and / or The nozzle (13) is a cylindrical nozzle.
10. A tail gas aftertreatment system, characterized in that, The exhaust gas aftertreatment system includes a nozzle device for an exhaust gas aftertreatment system according to any one of claims 1 to 9.