CN114412619A

CN114412619A - Urea nozzle

Info

Publication number: CN114412619A
Application number: CN202210121203.0A
Authority: CN
Inventors: 陈正国; 董伟; 苗垒
Original assignee: Wuxi Weifu Lida Catalytic Converter Co Ltd
Current assignee: Wuxi Weifu Lida Catalytic Converter Co Ltd
Priority date: 2022-02-09
Filing date: 2022-02-09
Publication date: 2022-04-29
Anticipated expiration: 2042-02-09
Also published as: CN114412619B

Abstract

The application discloses a urea nozzle which comprises a cooling sleeve, a heat dissipation sleeve, a spray head and a sprayer, wherein the cooling sleeve is provided with an air inlet joint and a liquid inlet joint and is communicated with the cooling sleeve; compressed air can enter the cooling jacket through the air inlet joint and contact the ejector, so that heat on the ejector is taken away, and the effects of heat dissipation and cooling are achieved; the compressed air carrying heat is partially discharged through the first air outlet and the other part is discharged through the second air outlet; when the compressed air is blown out through the second air outlet, the urea solution can be blown in multiple directions and atomized by means of airflow pressure; the first air outlet can increase a discharge channel of the compressed air, so that the stability of air inflow and air outflow of the compressed air is ensured, the fresh compressed air can enter the cavity, and the heat dissipation effect is realized.

Description

Urea nozzle

Technical Field

The application relates to the technical field of automobile exhaust treatment devices, in particular to a urea nozzle.

Background

The automobile exhaust contains harmful gases such as CO (carbon monoxide), HC (hydrocarbon) and NOx (nitrogen oxide), and the automobile exhaust needs to be purified to protect the environment and human bodies.

Selective Catalytic Reduction (SCR) is a treatment process for NOx in automobile exhaust. Specifically, after entering the SCR device, the exhaust gas is sprayed with a reducing agent ammonia or urea, and NOx is reduced to nitrogen and oxygen under the action of a catalyst.

The urea injection system is the core of the SCR after-treatment system, and the nozzle is a key component of the urea injection system, so that the quality of the urea atomization effect is determined. Currently, urea injection systems face two major problems: the cooling problem of the nozzle is the second problem of atomization of the nozzle.

Disclosure of Invention

The purpose of this application is to overcome the shortcoming that exists among the prior art, provides a urea nozzle.

To achieve the above technical object, the present application provides a urea nozzle comprising: the cooling sleeve is provided with an air inlet joint and a liquid inlet joint; the heat dissipation sleeve is communicated with the cooling sleeve, and a first air outlet hole is formed in the heat dissipation sleeve; the spray head is communicated with the heat dissipation sleeve, a liquid outlet hole and at least two second air outlet holes are formed in the spray head, and the liquid outlet hole is formed between the at least two second air outlet holes; the ejector is arranged in the cooling sleeve and communicated with the liquid inlet joint, and the ejector is arranged in the heat dissipation sleeve and communicated with the liquid outlet hole; compressed air enters the cooling sleeve through the air inlet joint and can take away heat on the ejector, after the compressed air passes through the cooling sleeve and enters the heat dissipation sleeve, part of the compressed air is discharged through the first air outlet hole, and the other part of the compressed air is discharged through the second air outlet hole; after entering the sprayer through the liquid inlet joint, the urea solution can enter the spray head through the sprayer and be discharged through the liquid outlet hole.

Further, a vortex plate is arranged in the cooling jacket, and the vortex plate extends spirally along the inner wall of the cooling jacket.

Further, the cooling jacket includes: the air inlet joint is communicated with the cylinder; the liquid inlet joint is communicated with the cover body; one end of the cylinder body is connected with the cover body in a sealing way, and the other end of the cylinder body is connected with the heat dissipation sleeve in a sealing way.

Furthermore, a plurality of radiating fins are arranged in the radiating sleeve at intervals along the circumferential direction.

Further, the heat dissipation sleeve is inwards recessed away from the bottom wall of the cooling sleeve; the bottom wall is provided with a mounting hole, and the spray head is arranged in the mounting hole; a plurality of first ventholes are formed in the bottom wall, and the mounting holes are arranged in a surrounding mode.

Further, be equipped with the feed liquor hole on the shower nozzle, the feed liquor hole includes: one end of the liquid inlet section is communicated with the ejector; the first circulation section is arranged on the spray head along the circumferential direction, and the other end of the liquid inlet section is communicated with the first circulation section; and one end of the liquid outlet section is communicated with the first circulation section, and the other end of the liquid outlet section is communicated with the liquid outlet hole.

Furthermore, a second circulation section is also arranged on the spray head and is arranged on the spray head along the circumferential direction and communicated with the heat dissipation sleeve; one end of the second air outlet hole is communicated with the second circulation section, the other end of the second air outlet hole penetrates through the sprayer, and the second air outlet hole extends towards the liquid outlet hole in an inclined mode.

Further, the ejector includes: a first flow channel is arranged in the limiting block and communicated with the liquid inlet joint; the valve rod is internally provided with a second flow passage which is communicated with the first flow passage; the elastic piece is arranged between the limiting block and the valve rod; the valve ball is arranged at one end of the valve rod, which is far away from the limiting block; the electromagnet is used for driving the valve rod to drive the valve ball to be close to or far away from the limiting block; the protective sleeve is internally provided with a third flow passage, the spray head is arranged in the third flow passage, and at least part of the valve rod is positioned in the third flow passage; the nozzle is provided with a circulation groove which is communicated with the liquid outlet hole, and the valve ball can approach or leave the liquid outlet hole along the circulation groove; when the valve ball abuts against the liquid outlet hole, the liquid outlet hole can be blocked, so that the urea solution is prevented from being discharged; after the valve ball is far away from the liquid outlet hole, the urea solution can be discharged through the liquid outlet hole.

Furthermore, a circulation hole is formed in the valve rod and is communicated with the second flow passage and the third flow passage; a liquid inlet hole is formed in the spray head and is communicated with the third flow passage and the circulation groove; the urea solution entering the second flow passage can enter the third flow passage through the circulation hole and then enter the circulation groove through the liquid inlet hole.

Further, the urea nozzle also comprises a fixing flange for fastening the cooling jacket and the heat dissipation jacket.

The application provides a urea nozzle which comprises a cooling sleeve, a heat dissipation sleeve, a spray head and a sprayer, wherein the cooling sleeve is provided with an air inlet joint and a liquid inlet joint and is communicated with the cooling sleeve; compressed air can enter the cooling jacket through the air inlet joint and contact the ejector, so that heat on the ejector is taken away, and the effects of heat dissipation and cooling are achieved; the urea solution can enter the ejector through the liquid inlet joint; the compressed air carrying heat is partially discharged through the first air outlet and the other part is discharged through the second air outlet; when the compressed air is blown out through the second air outlet, the urea solution can be blown in multiple directions and atomized by means of airflow pressure; the first air outlet can increase a discharge channel of the compressed air, so that the stability of air inflow and air outflow of the compressed air is ensured, the fresh compressed air can enter the cavity, and the heat dissipation effect is realized.

Drawings

FIG. 1 is a schematic perspective view of a urea nozzle provided herein;

FIG. 2 is a cross-sectional view of the urea nozzle of FIG. 1 in another orientation;

FIG. 3 is a front cross-sectional view of the urea nozzle of FIG. 1;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

fig. 5 is a structural sectional view of the spray head in fig. 3 in another direction.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The present application provides a urea nozzle comprising: the cooling jacket 10, there are air inlet joints 1 and liquid inlet joints 2 on the cooling jacket 10; the heat dissipation sleeve 20 is communicated with the cooling sleeve 10, and a first air outlet 21 is formed in the heat dissipation sleeve 20; the spray head 30 is communicated with the heat dissipation sleeve 20, a liquid outlet hole 31 and at least two second air outlet holes 32 are formed in the spray head 30, and the liquid outlet hole 31 is formed between the at least two second air outlet holes 32; and a part of the ejector is arranged in the cooling jacket 10 and communicated with the liquid inlet joint 2, and the other part of the ejector is arranged in the heat dissipation jacket 20 and communicated with the liquid outlet hole 31.

Referring specifically to fig. 1 to 3, in the illustrated embodiment, the cooling jacket 10 is disposed above the heat dissipation jacket 20, and the air inlet connector 1 is disposed on one side of the cooling jacket 10 and the liquid inlet connector 2 is disposed on the top of the cooling jacket. In specific embodiments, the air inlet joint 1 is communicated with a compressed air supply device (not shown, such as an air pump in a vehicle), the compressed air supply device can output compressed air, and the compressed air can enter the cooling jacket 10 through the air inlet joint 1; the inlet connection 2 communicates with a urea supply (not shown) which can deliver urea solution which can enter the injector through the inlet connection 2.

With continued reference to FIG. 2, in the illustrated embodiment, the cooling jacket 10 and the heat sink jacket 20 are both hollow inside, forming a communicating cavity to facilitate injector placement. The ejector is hidden in the cavity, and the cooling jacket 10 and the heat dissipation jacket 20 can play a role in protection and dust prevention.

After entering the cooling jacket 10, the compressed air is able to contact the injector in the cavity and is able to flow along the cavity and finally leave the urea nozzle. It should be explained that the injector may generate heat during operation, and if the heat is not dissipated in time, as the temperature of the injector increases, the urea solution flowing through the injector may volatilize or crystallize due to the high temperature. Therefore, when the urea nozzle works, the air supply equipment provides normal-temperature or low-temperature compressed air, and after the compressed air contacts the ejector in the cavity, the heat on the ejector can be taken away, so that the effects of heat dissipation and temperature reduction are achieved. After the compressed air carries heat through the cooling jacket 10 and the heat dissipation jacket 20, part of the compressed air is discharged through the first air outlet hole 21, and the other part of the compressed air is discharged through the second air outlet hole 32.

After entering the injector, the urea solution can enter the spray head 30 through the injector and be discharged through the liquid outlet hole 31. The ejector can control the discharge conditions of the urea solution such as the injection time, the injection amount and the like so as to meet the purification requirement of the tail gas.

Since the liquid outlet holes 31 are disposed between the at least two second air outlet holes 32, when the compressed air is blown out through the second air outlet holes 32, the urea solution can be blown in multiple directions, and the urea solution can be efficiently atomized by the airflow pressure.

Meanwhile, through the arrangement of the first air outlet hole 21, a discharge channel of compressed air can be increased, so that the stability of the air input and the air output of the compressed air is ensured, the fresh compressed air can enter the cavity, and the heat dissipation effect is realized.

Optionally, a scroll plate 3 is provided within the cooling jacket 10, the scroll plate 3 extending helically along the inner wall of the cooling jacket 10.

Referring specifically to fig. 2 and 3 in combination, the scroll plate 3 is similar to a helical blade, one end of the scroll plate 3 is near or in contact with the top of the cooling jacket 10, the other end is near or in contact with the bottom of the cooling jacket 10 and communicates with the heat dissipation jacket 20, and from top to bottom, the scroll plate 3 extends spirally from the top of the cooling jacket 10 to the bottom of the cooling jacket 10 along the inner wall of the cooling jacket 10. Further, the air inlet joint 1 is communicated with the output end of the cooling jacket 10 and is positioned above the vortex plate 3; so, compressed air receives the injecing and the guide of vortex board 3 after blowing in cooling jacket 10, can fully sweep the inside space of cavity, guarantee the cooling radiating effect.

Further, to ensure that the air entering the cooling jacket 10 through the inlet fitting 1 efficiently sweeps the space inside the cavity, the inlet fitting 1 is disposed near the top of the cooling jacket 10. In this way, the gas flow can be swept from top to bottom along the path defined by the scroll plate 3.

With continued reference to fig. 2, the scroll plate 3 is connected on one side to the inner wall of the cooling jacket 10 and on the other side extends towards the injector. By reducing the clearance between the ejector and the scroll plate 3, the flow direction of the compressed air can be better defined, and the purging heat dissipation performance of the compressed air is ensured.

Alternatively, the thickness of the plate wall of the scroll plate 3 is gradually reduced from the inner wall of the cooling jacket 10 toward the ejector. At the moment, the side with larger thickness of the plate wall of the scroll plate 3 is connected with the inner wall of the cooling jacket 10, which is beneficial to the stability of the connection of the scroll plate and the cooling jacket; along with the reduction of the plate wall thickness of the vortex plate 3, the weight can be reduced, the vortex plate 3 can be prevented from occupying too much cavity space, and the circulation of compressed air is facilitated.

Optionally, the bottom of the cooling jacket 10 is provided with a through hole, the through hole is communicated with the inner cavity of the heat dissipation jacket 20, the ejector is arranged in the through hole in a penetrating manner, and compressed air can flow into the heat dissipation jacket 20 through the through hole.

In order to facilitate the installation of the injector, optionally, a receiving block extending toward the axis thereof is provided in the through hole. Referring specifically to fig. 2, in the illustrated embodiment, the injector includes a portion with a larger outer diameter that can pass through the through-hole and into the heat sink 20, and a portion with a smaller outer diameter (described in more detail below with respect to the structure of the injector), which is blocked by the receiving block. Thus, when the injector is installed, the part with the smaller outer diameter of the injector passes through the through hole and enters the heat dissipation sleeve 20, and after the bearing block contacts the part with the larger outer diameter of the injector, the bearing block can play a role in limiting the position of the injector.

Further, set up two at least bearing blocks in the through-hole, two at least bearing block cooperations can hold the great part of sprayer external diameter, and then fixed sprayer in the cavity.

Optionally, the cooling jacket 10 comprises: the cylinder 11 is communicated with the air inlet joint 1; the liquid inlet joint 2 is communicated with the cover body 12; one end of the cylinder 11 is hermetically connected with the cover 12, and the other end is hermetically connected with the heat dissipation sleeve 20.

Referring to fig. 2 or fig. 3, in the illustrated embodiment, the cylinder 11 is cylindrical and has openings at its upper and lower ends, the cover 12 is used for sealing the upper end opening of the cylinder 11, and the lower end opening (i.e., the through hole) of the cylinder 11 is communicated with the heat dissipation sleeve 20. In one embodiment, the injector is installed such that the barrel 11 and the cap 12 are in a separated state; after the sprayer is mounted in place, the cover 12 is secured to the upper opening of the barrel 11.

The cooling jacket 10 is arranged in a split manner, so that the cooling jacket 10 is formed conveniently, and the components such as the air inlet connector 1, the liquid inlet connector 2 and the ejector are convenient to mount.

Optionally, the cylinder 11 and the cover 12 are welded and fixed; or, the cylinder 11 and the cover 12 are connected by a wire sealing plug.

In one embodiment, the cooling jacket 10 is integrally formed with the heat sink jacket 20.

In another embodiment, the cooling jacket 10 is provided separately from the heat dissipating jacket 20. Optionally, the cooling jacket 10 is welded to the heat sink jacket 20.

To facilitate the fastening of the cooling jacket 10 to the cooling jacket 20, the urea nozzle optionally further comprises a fastening flange 5 for fastening the cooling jacket 10 and the cooling jacket 20.

Referring to fig. 1 and 2, in the illustrated embodiment, the upper end of the fixing flange 5 is fixedly connected to the bottom wall of the cooling jacket 10, at least a portion of the heat dissipation jacket 20 can be inserted into the fixing flange 5, the outer wall surface of the heat dissipation jacket 20 is attached to the inner wall surface of the fixing flange 5, the fixing flange 5 can lock the heat dissipation jacket 20, and the cooling jacket 10 and the heat dissipation jacket 20 are connected and also have a certain sealing effect.

Optionally, a plurality of cooling fins 4 are disposed in the cooling jacket 20, and the plurality of cooling fins 4 are disposed at intervals along the circumferential direction.

The heat dissipation area in the heat dissipation sleeve 20 can be increased by arranging the heat dissipation fins 4 in the heat dissipation sleeve 20; after entering the heat dissipation sleeve 20, the compressed air carrying heat contacts with the wall surfaces of the plurality of heat dissipation fins 4, so that the heat can be diffused in multiple points, and the heat dissipation effect is improved.

In one embodiment, referring to fig. 3, the heat dissipating sleeve 20 is extended in a vertical direction, and one side of the heat dissipating fin 4 is connected to the inner wall of the heat dissipating sleeve 20, and the other side is extended toward the axial center of the heat dissipating sleeve 20, so that, on one hand, the wall surface of the heat dissipating fin 4 contacting the compressed air can be enlarged, and on the other hand, the compressed air can be guided by the heat dissipating fin 4 to move toward the axial center of the heat dissipating sleeve 20, so that the compressed air can enter the first air outlet hole 21 and the second air outlet hole 32.

Further, in the embodiment shown in fig. 3, any one of the heat dissipating fins 4 is extended in the vertical direction, and can effectively act on the compressed air in the entire heat dissipating sleeve 20.

Referring to fig. 4 in combination, in the illustrated embodiment, six cooling fins 4 are disposed in the cooling jacket 20, and the six cooling fins 4 are disposed at equal intervals in the circumferential direction around the axial center of the cooling jacket 20. Further, the wall thickness of the heat sink 4 gradually decreases from the inner wall of the heat sink 20 toward the axis of the heat sink 20; as can be seen from fig. 4, the horizontal cross section of the heat sink 4 resembles a triangle; thus, the space occupation of the radiating fins 4 can be reduced, the diffusion space of the compressed air is increased, and the installation of the ejector is facilitated.

Optionally, the heat sink sleeve 20 is recessed inwardly away from the bottom wall of the cooling sleeve 10; the bottom wall is provided with a mounting hole, and the spray head 30 is arranged in the mounting hole; a plurality of first ventholes 21 are formed in the bottom wall, and the mounting holes are formed in the surrounding mode of the first ventholes 21.

Referring to fig. 3, in the illustrated embodiment, the injector is vertically disposed in the cavity, the output end of the injector faces the spray head 30, and the spray head 30 is disposed on the bottom wall of the heat dissipation sleeve 20. The bottom wall of the heat dissipation sleeve 20 protrudes towards the inner cavity of the heat dissipation sleeve 20, so that a groove is formed at the bottom of the heat dissipation sleeve 20, and the mounting hole is formed at the bottom of the groove. After the nozzle 30 is arranged in the mounting hole, the wall of the groove surrounds the nozzle 30, and a funnel-shaped diffusion space is formed in front of the output end of the nozzle 30.

Referring to fig. 1 and 2, a plurality of first outlet holes 21 surround the mounting hole, and the first outlet holes 21 are positioned lower than the mounting hole in the vertical direction. Therefore, when part of the compressed air is discharged from the first air outlet 21, the discharged plurality of channels of compressed air can surround the urea solution discharged from the spray head 30, which is beneficial to further promoting the atomization of the urea solution. In addition, because the groove wall of the groove extends towards the spray head 30 in an inclined manner, the groove also has a converging effect, and compressed air can be well guided to flow towards the urea solution, so that atomization is promoted.

For making things convenient for the urea solution to discharge, optionally, be equipped with the feed liquor hole on the shower nozzle 30, the feed liquor hole includes: at least two liquid inlet sections 33a, wherein one end of each liquid inlet section 33a is communicated with the ejector; the first circulation section 33b is arranged on the spray head 30 along the circumferential direction, and the other end of the liquid inlet section 33a is communicated with the first circulation section 33 b; at least two liquid outlet sections 33c, one end of the liquid outlet section 33c is communicated with the first circulation section 33b, and the other end is communicated with the liquid outlet hole 31.

By providing at least two liquid inlet sections 33a, on one hand, the inlet passage of the urea solution in the spray head 30 can be increased, thereby ensuring the discharge amount of the spray head 30; on the other hand, the at least two liquid inlet sections 33a are respectively arranged at different positions of the spray head 30, which is beneficial for the urea solution to uniformly flow into the spray head 30, and is further beneficial for the uniformity of the spray head 30.

To facilitate a uniform flow of the at least two urea solutions entering the spray head 30 through the at least two inlet sections 33a towards the outlet openings 31, a first recirculation section 33b is provided. As will be readily appreciated, since the first circulation section 33b is disposed in the circumferential direction, the first circulation section 33b can communicate with the plurality of liquid inlet sections 33a simultaneously. At this point, at least two urea solution flows entering the spray head 30 via the inlet section 33a can mix in the first circulation section 33b and then exit through the outlet section 33c and the outlet holes 31.

By arranging at least two liquid outlet sections 33c, on one hand, the outflow passages of the urea solution in the spray head 30 can be increased, and the discharge amount of the spray head 30 is further ensured; on the other hand, at least two liquid outlet sections 33c are separately arranged at different positions of the spray head 30, which is beneficial for the urea solution to uniformly flow into the liquid outlet holes 31.

Alternatively, the liquid inlet sections 33a correspond to the liquid outlet holes 31 one by one.

The application does not limit the setting position and the quantity of the liquid inlet section 33a and the liquid outlet hole 31, the output end of the liquid inlet section 33a can be opposite to the input end of the liquid outlet section 33c, and the liquid inlet section 33a and the liquid outlet section 33c can also be arranged in a staggered mode.

In one embodiment, with combined reference to fig. 3 and 5, the spray head 30 is disposed within a jacket 46 (described in more detail below), and the inlet section 33a and the first annular flow section 33b are formed on the surface of the spray head 30. Since the outer wall of the nozzle 30 is attached to the inner wall of the sheath 46, the sheath 46 can cooperate with the liquid inlet section 33a and the first circulation section 33b to form a passage through which the urea solution can flow. The liquid inlet section 33a penetrates through the upper surface of the spray head 30 so as to communicate with the sprayer; the liquid outlet section 33c is disposed in the first circulation section 33b and penetrates through the side wall of the nozzle 30 so as to be communicated with a circulation groove 35 (specifically, described in detail below), and the circulation groove 35 is simultaneously communicated with each liquid outlet section 33c, so that the urea solution flowing out through the liquid outlet section 33c can be converged, and the urea solution can be guided to flow into the liquid outlet hole 31.

In other embodiments, the inlet section 33a and the first circulation section 33b may be opened inside the spray head 30, and in this case, the inlet section 33a and the first circulation section 33b independently form a passage through which the urea solution can flow.

Similarly, in order to facilitate the discharge of the compressed air through the second air outlet 32, optionally, the nozzle 30 is further provided with a second circulation section 34, and the second circulation section 34 is circumferentially arranged on the nozzle 30 and communicated with the heat dissipation sleeve 20; one end of the second air outlet 32 is communicated with the second circulation section 34, and the other end of the second air outlet 32 penetrates through the spray head 30, and the second air outlet 32 extends towards the liquid outlet 31 in an inclined mode.

Since the second circulation section 34 is provided in the circumferential direction, the second circulation section 34 can communicate with the plurality of second outlet holes 32 at the same time. At this time, the compressed air entering the second circulation section 34 can flow along the second circulation section 34 and then enter the respective second outlet holes 32. As can be readily appreciated, the second circulation section 34 has a large flow area to facilitate compressed air ingress; the compressed air can be facilitated to enter the second outlet aperture 32 again by the guidance of the second annular flow section 34.

In one embodiment, and with reference to FIGS. 3 and 5 in combination, the spray head 30 is disposed within a jacket 46 (described in more detail below), and the second annular flow section 34 is formed on a surface of the spray head 30. Since the outer wall of nozzle tip 30 conforms to the inner wall of jacket 46, jacket 46 is able to cooperate with second circulation section 34 to form a passageway through which pressurized air may flow. Further, the sheath 46 is provided with an air inlet, the air inlet faces the second circulation section 34, and the compressed air in the heat dissipation sleeve 20 can enter the second circulation section 34 through the air inlet.

Optionally, the bottom wall of the spray head 30 away from the injector is provided with a converging groove 36, and particularly referring to fig. 2, in the illustrated embodiment, the converging groove 36 is in an inverted funnel shape, the liquid outlet hole 31 is provided at the bottom of the converging groove 36, and the plurality of second air outlet holes 32 are provided around the liquid outlet hole 31. In the vertical direction, the output end of the second air outlet hole 32 is lower than the liquid outlet hole 31.

Optionally, the output ends of the second air outlets 32 are arranged at intervals along the circumferential direction, and the output end of the liquid outlet 31 is arranged at the center of the circumference. Since the second outlet holes 32 extend obliquely toward the outlet holes 31, the compressed air discharged through the second outlet holes 32 has a tendency to flow toward the central axis of the circumference along which the urea solution discharged through the outlet holes 31 flows. The plurality of channels of compressed air discharged through the plurality of second air outlet holes 32 are converged in front of the liquid outlet holes 31, so that a low-pressure area is formed near the output ends of the liquid outlet holes 31, and the urea solution is sucked under the influence of the air pressure difference, so that the flow rate of the urea solution is increased; the compressed gas can also promote the atomization of the urea solution after contacting with the urea solution.

In one embodiment, an ejector comprises: a limiting block 41, wherein a first flow channel 41a is arranged in the limiting block 41, and the first flow channel 41a is communicated with the liquid inlet joint 2; a valve rod 42, wherein a second flow passage 42a is arranged in the valve rod 42, and the second flow passage 42a is communicated with the first flow passage 41 a; an elastic member 43 provided between the stopper 41 and the valve stem 42; the valve ball 44 is arranged at one end of the valve rod 42 far away from the limiting block 41; the electromagnet 45 is used for driving the valve rod 42 to drive the valve ball 44 to be close to or far away from the limiting block 41; a sheath 46, a third flow passage 46a is arranged in the sheath 46, the spray head 30 is arranged in the third flow passage 46a, and at least part of the valve rod 42 is arranged in the third flow passage 46 a; wherein, the nozzle 30 is provided with a circulation groove 35, the circulation groove 35 is communicated with the liquid outlet hole 31, and the valve ball 44 can approach or leave the liquid outlet hole 31 along the circulation groove 35; when the valve ball 44 abuts against the liquid outlet hole 31, the liquid outlet hole 31 can be blocked, so that the urea solution is prevented from being discharged; after the valve ball 44 is far away from the liquid outlet hole 31, the urea solution can be discharged through the liquid outlet hole 31.

Referring specifically to fig. 3, in the illustrated embodiment, the liquid inlet joint 2 is disposed at the top of the cooling jacket 10, and a stepped hole is disposed in the liquid inlet joint 2; the upper section of the stepped hole has smaller hole diameter and is communicated with urea solution supply equipment to allow the urea solution to flow; the diameter of the lower section of the stepped hole is large, and the upper section of the limiting block 41 extends into the lower section of the stepped hole, so that the urea solution can efficiently enter the first flow passage 41a through the stepped hole.

Optionally, a first sealing element 6 is arranged between the limiting block 41 and the liquid inlet joint 2. The first sealing element 6 may be an elastic sealing ring, and can block the gap between the limiting block 41 and the liquid inlet joint 2, so as to prevent the urea solution from overflowing from the gap.

Referring to fig. 2 and 3 in combination, in the illustrated embodiment, the electromagnet 45 includes an armature 45a, a solenoid winding 45b, a wire 45c, and a connector 45d, wherein the connector 45d is used for connecting with a power supply, when the power supply supplies power, current acts on the solenoid winding 45b through the wire 45c to form a magnetic field, and further, the armature 45a is attracted and the armature 45a is caused to move; after the power is off, the magnetic field disappears and the armature 45a can reset. Specifically, a through installation hole is formed in the armature 45a, the valve rod 42 penetrates through the installation hole and is fixedly connected with the armature 45a, and when the armature 45a moves, the valve rod 42 can be driven to move, so that the valve ball 44 is driven to move.

Optionally, the electromagnet 45 further includes a coil injection molded casing 45e, which is wrapped outside the electromagnetic coil winding 45b, and can protect the electromagnetic coil winding 45b and improve the safety of the device.

Optionally, the electromagnet 45 further includes a support housing 45f, which is connected to the coil molded housing 45e and the stopper 41, to better conceal the solenoid winding 45 b. In addition, when the electromagnetic coil winding 45b is electrified and works, heat is generated, and the supporting shell 45f can better receive and radiate heat outwards; the compressed air contacts the support housing 45f and can carry away heat.

With continued reference to fig. 3, in the illustrated embodiment, the first flow passage 41a is a multi-step hole, wherein the first-step hole has the smallest diameter and is directly connected to the liquid inlet connector 2; the aperture of the second section of hole is larger than that of the first section of hole, and the armature 45a is arranged in the second section of hole and can move along the second section of hole; the third section of holes have a larger diameter than the second section of holes and the sheath 46 is disposed in the third section of holes. The valve stem 42 has one end connected to the armature 45a and the other end extending into the sheath 46 and connected to the valve ball 44.

Further, the first flow channel 41a is provided with a mounting hole provided between the first hole and the second hole, and the mounting hole has a diameter larger than the first hole and smaller than the second hole. The elastic member 43 is disposed in the mounting hole, and one end of the elastic member 43 abuts against the step between the first-stage hole and the mounting hole, and the other end thereof extends into the seating hole of the armature 45a and abuts against the valve rod 42.

Specifically, when the power supply supplies power, the armature 45a is adsorbed, and drives the valve rod 42 to move towards the first section hole, so that the valve ball 44 is far away from the liquid outlet hole 31, and the elastic piece 43 is compressed; after the power supply is cut off, the electromagnetic coil winding 45b loses the adsorption force, the elastic piece 43 recovers, the valve rod 42 is pushed, the armature 45a and the valve ball 44 are driven to reset, and the valve ball 44 is close to the liquid outlet hole 31. The elastic member 43 is kept in a compressed state, and the elastic member 43 always has elastic force of restoring to the original state and can press the valve ball 44, so that the valve ball 44 blocks the liquid outlet hole 31.

Optionally, a second sealing element 7 is provided between the sheath 46 and the stop block 41. The second sealing member 7 may be an elastic sealing ring, and may seal a gap between the sheath 46 and the stopper 41, so as to prevent the urea solution from overflowing from the gap, and prevent compressed air from entering the first flow channel 41a through the gap.

Alternatively, the bottom of the circulation groove 35 is tapered, and the diameter of the bottom of the groove decreases as the bottom of the groove is closer to the liquid outlet hole 31, which facilitates the sealing of the liquid outlet hole 31 by the valve ball 44.

In a specific embodiment, referring to fig. 3 and 5, the nozzle 30 is provided with a liquid inlet hole, the liquid inlet hole includes at least two liquid inlet sections 33a, a first circulation section 33b and at least two liquid outlet sections 33c (see above for details), and the at least two liquid outlet sections 33c are both communicated with the circulation groove 35. The urea solution enters the first flow channel 41a through the inlet joint 2, can enter the second flow channel 42a along the first flow channel 41a, enters the third flow channel 46a from the second flow channel 42a, enters the inlet hole from the third flow channel 46a, and then enters the circulation groove 35 through the inlet section 33a, the first circulation section 33b and the outlet section 33c once. After the valve ball 44 is far away from the liquid outlet hole 31, the urea solution can enter the liquid outlet hole 31 through the circulation groove 35 and finally be discharged.

In order to facilitate the urea solution to flow out of the second flow passage 42a, optionally, a flow hole 42b is formed in the valve rod 42, and the flow hole 42b communicates the second flow passage 42a and the third flow passage 46 a; a liquid inlet hole is formed in the spray head 30 and is communicated with the third flow passage 46a and the circulation groove 35; the urea solution introduced into the second flow passage 42a can be introduced into the third flow passage 46a through the flow hole 42b and then introduced into the flow groove 35 through the liquid inlet hole.

In one embodiment, valve stem 42 is rolled from sheet metal; in the rolling process, both ends of the sheet metal plate are close to each other, and after the valve rod 42 is manufactured, both ends of the sheet metal plate are arranged at intervals, which are the flow holes 42 b. Because the sheet metal plate is a finished plate, the surface of the sheet metal plate is processed and is smooth and has no burrs; therefore, the valve stem 42 is obtained by rolling a sheet metal plate, and the surfaces of the valve stem 42 are also flat and free of burrs. Meanwhile, since the flow holes 42b are formed by spacing both ends of the sheet metal plate, the edges of the flow holes 42b are also flat and burr-free.

In other embodiments, the flow hole 42b may be a through hole of any shape such as a circular hole or a square hole formed in the valve stem 42.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A urea nozzle, comprising:

the cooling jacket (10), wherein the cooling jacket (10) is provided with an air inlet joint (1) and a liquid inlet joint (2);

the heat dissipation sleeve (20) is communicated with the cooling sleeve (10), and a first air outlet hole (21) is formed in the heat dissipation sleeve (20);

the spray head (30) is communicated with the heat dissipation sleeve (20), a liquid outlet hole (31) and at least two second air outlet holes (32) are formed in the spray head (30), and the liquid outlet hole (31) is formed between the at least two second air outlet holes (32);

the ejector is partially arranged in the cooling sleeve (10) and communicated with the liquid inlet joint (2), and the ejector is partially arranged in the heat dissipation sleeve (20) and communicated with the liquid outlet hole (31);

compressed air enters the cooling jacket (10) through the air inlet joint (1) and can take away heat on the ejector, after the compressed air passes through the cooling jacket (10) and enters the heat dissipation jacket (20), part of the compressed air is discharged through the first air outlet hole (21), and the other part of the compressed air is discharged through the second air outlet hole (32);

urea solution passes through liquid inlet joint (2) get into behind the sprayer, can pass through the sprayer gets into shower nozzle (30) and pass through go out liquid hole (31) and discharge.

2. Urea nozzle according to claim 1, characterized in that a vortex plate (3) is arranged in the cooling jacket (10), which vortex plate (3) extends helically along the inner wall of the cooling jacket (10).

3. Urea nozzle according to claim 1 or 2, characterized in that the cooling jacket (10) comprises:

the cylinder (11), the air inlet joint (1) is communicated with the cylinder (11);

the liquid inlet joint (2) is communicated with the cover body (12);

one end of the cylinder body (11) is hermetically connected with the cover body (12), and the other end of the cylinder body is hermetically connected with the heat dissipation sleeve (20).

4. Urea nozzle according to claim 1, characterized in that a number of cooling fins (4) are arranged in the cooling jacket (20), which cooling fins (4) are arranged at circumferential intervals.

5. Urea nozzle according to claim 1, characterized in that the heat sink sleeve (20) is recessed inwards away from the bottom wall of the cooling sleeve (10);

the bottom wall is provided with a mounting hole, and the spray head (30) is arranged in the mounting hole;

the bottom wall is provided with a plurality of first air outlet holes (21), and the first air outlet holes (21) are arranged around the mounting hole.

6. Urea nozzle according to claim 1 or 5, characterized in that the spray head (30) is provided with a liquid inlet opening comprising:

at least two liquid inlet sections (33 a), one end of each liquid inlet section (33 a) is communicated with the ejector;

the first circulation section (33 b) is arranged on the spray head (30) along the circumferential direction, and the other end of the liquid inlet section (33 a) is communicated with the first circulation section (33 b);

and one end of the liquid outlet section (33 c) is communicated with the first circulation section (33 b), and the other end of the liquid outlet section (33 c) is communicated with the liquid outlet hole (31).

7. Urea nozzle according to claim 1 or 5, characterized in that a second recirculation section (34) is arranged in the spray head (30), which second recirculation section (34) is arranged circumferentially in the spray head (30) and communicates with the heat sink sleeve (20);

one end of the second air outlet hole (32) is communicated with the second circulation section (34), the other end of the second air outlet hole penetrates through the spray head (30), and the second air outlet hole (32) extends towards the liquid outlet hole (31) in an inclined mode.

8. The urea nozzle of claim 1, wherein the injector comprises:

a limiting block (41), wherein a first flow channel (41 a) is arranged in the limiting block (41), and the first flow channel (41 a) is communicated with the liquid inlet joint (2);

a valve rod (42), wherein a second flow passage (42 a) is arranged in the valve rod (42), and the second flow passage (42 a) is communicated with the first flow passage (41 a);

the elastic piece (43) is arranged between the limiting block (41) and the valve rod (42);

the valve ball (44) is arranged at one end of the valve rod (42) far away from the limiting block (41);

the electromagnet (45) is used for driving the valve rod (42) to drive the valve ball (44) to be close to or far away from the limiting block (41);

a sheath (46), wherein a third flow passage (46 a) is arranged in the sheath (46), the spray head (30) is arranged in the third flow passage (46 a), and at least part of the valve rod (42) is positioned in the third flow passage (46 a);

wherein, a circulation groove (35) is arranged on the spray head (30), the circulation groove (35) is communicated with the liquid outlet hole (31), and the valve ball (44) can be close to or far away from the liquid outlet hole (31) along the circulation groove (35);

when the valve ball (44) abuts against the liquid outlet hole (31), the liquid outlet hole (31) can be blocked, so that the urea solution is prevented from being discharged;

after the valve ball (44) is far away from the liquid outlet hole (31), the urea solution can be discharged through the liquid outlet hole (31).

9. The urea nozzle according to claim 8, wherein the valve rod (42) is provided with a flow hole (42 b), and the flow hole (42 b) is communicated with the second flow passage (42 a) and the third flow passage (46 a);

a liquid inlet hole is formed in the spray head (30), and the liquid inlet hole is communicated with the third flow channel (46 a) and the circulation groove (35);

the urea solution entering the second flow passage (42 a) can enter the third flow passage (46 a) through the flow hole (42 b) and then enter the flow groove (35) through the liquid inlet hole.

10. Urea nozzle according to claim 1, characterized in that the urea nozzle also comprises a fixing flange (5) for fastening the cooling jacket (10) and the heat sink jacket (20).