Easily-processed rotational flow urea nozzle

Abstract

The utility model discloses a rotational flow urea nozzle easy to machine, which belongs to the technical field of urea spraying and comprises a nozzle valve seat, and a spraying hole plate is fixed at the bottom of the nozzle valve seat. An opening hole, a cylindrical-table-shaped hole, an overflowing hole and a rotational flow channel are sequentially formed in the nozzle valve seat from top to bottom. The rotational flow runner comprises a first straight hole runner, a second straight groove runner and a third circular runner which are connected in sequence. The third circular flow channel can be machined by machining the cylinder at the bottom of the nozzle valve seat; a plurality of second straight flute runners connected with the third circular runner are uniformly processed at the bottom of the nozzle valve seat along the circumference of the third circular runner; a first straight hole flow channel is directly machined towards the overflowing hole through one end, far away from the third circular flow channel, of each second straight groove flow channel; the swirling flow channel is simple in structure, low in machining difficulty and small in mass production difficulty, the change amount of the nozzle assembly is reduced, and swirling flow can be achieved by directly machining a plurality of straight flow channels and a cylinder on a valve seat on an existing nozzle.

Description

Technical Field

[0001] The utility model belongs to the technical field of urea injection, and particularly relates to a swirl urea nozzle which is easy to process. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] The SCR post-treatment technology has been widely applied to vehicles. The urea nozzle is the simplest and most reliable mechanical device for realizing the atomization of liquid working medium. However, in the actual application process, the failure rate of the urea nozzle has been remaining high.

[0004] For traditional three-hole or six-hole electronically controlled nozzles, a large pressure difference is used to generate a high-speed flow beam to make a relative movement with the gas to overcome the action of the liquid surface tension, so as to achieve the atomization effect. Such atomization has relatively high processing requirements for the nozzle plate. Among them, the nozzle holes are not only tiny but also need to have a certain angle, and the processing difficulty and cost are relatively high; in addition, due to the very small aperture of the nozzle holes of such urea nozzles, they are easily affected by external exhaust gas and internal urea during actual use, resulting in failures such as blockage and crystallization.

[0005] To solve the above problems, Patent CN220346191 U discloses a three-stage swirl urea nozzle seat and a swirl urea nozzle. The three-stage swirl urea nozzle seat includes a body. A conical hole and a flow-through hole are sequentially arranged and communicated on the first end side of the body. A spray hole is arranged on the second end side of the body, and the spray hole is communicated with the flow-through hole through a swirl flow channel; the swirl flow channel includes a first straight-hole flow channel, a second straight-groove flow channel and a third circular flow channel which are sequentially communicated, and the first straight-hole flow channel and the second straight-groove flow channel intersect at a position far from the axis of the body.

[0006] The above scheme has the following disadvantages:

[0007] (1) The swirl structure is complex, the processing requirements for the swirl flow channel at the bottom are high, and the consistency of the flow channel processing is poor, making it difficult to ensure the consistency of products during mass production;

[0008] (2) The processing speed is slow, a large amount of time is required for processing, and the product output efficiency is low;

[0009] (3) The flow channel is long, resulting in relatively large energy loss. Content of the Utility Model

[0010] Aiming at the above problems, the utility model provides a swirl urea nozzle which is easy to process, can save processing costs, and realizes quantitative production; has a better atomization effect and lower energy loss of swirl, and has more advantages in performance and cost.

[0011] To achieve the above object, the utility model adopts the following technical solutions:

[0012] A swirl urea nozzle that is easy to process, including a nozzle valve seat, and a spray hole plate is fixed at the bottom of the nozzle valve seat; an opening hole, a cylindrical tapered hole, a flow-through hole, and a swirl flow channel are sequentially arranged inside the nozzle valve seat from top to bottom; the swirl flow channel includes a first straight hole flow channel, a second straight groove flow channel, and a third circular flow channel that are sequentially connected.

[0013] Preferably, a nozzle outlet is arranged at the center of the spray hole plate, and the size of the spray hole plate is the same as that of the bottom of the nozzle valve seat.

[0014] Preferably, the flow-through hole is not directly communicated with the nozzle outlet in the axial direction, but is communicated through the swirl flow channel.

[0015] Preferably, the number of the swirl flow channels is multiple, but the number of the third circular flow channels is one.

[0016] Preferably, one end of the first straight hole flow channel is connected to the flow-through hole, and the other end is directly connected to the bottom of the nozzle valve seat.

[0017] Preferably, the second straight groove flow channel is located at the bottom of the nozzle valve seat, and the second straight groove flow channel is connected to one end of the first straight hole flow channel located in the nozzle valve seat.

[0018] Preferably, the third circular flow channel is arranged at the center of the bottom end of the nozzle valve seat.

[0019] Preferably, the multiple second straight groove flow channels are uniformly arranged along the circumference of the third circular flow channel and are tangentially connected to the third circular flow channel.

[0020] Preferably, the multiple first straight hole flow channels are uniformly arranged along the circumference of the flow-through hole.

[0021] Compared with the prior art, the advantages and positive effects of the utility model are:

[0022] The swirl urea nozzle of the utility model has the following main advantages:

[0023] (1) The flow channel structure of the nozzle valve seat is optimized and improved, the structure is relatively simple, the processing difficulty is low, and the mass production difficulty is small; the change amount of the nozzle assembly is reduced, and several straight flow channels and a cylinder can be directly processed on the valve seat of the existing nozzle to achieve swirl;

[0024] (2) Through simulation calculation, the swirl intensity is relatively high and the atomization effect is good;

[0025] (3) The flow channel is relatively short and the energy loss is relatively low. Description of the Drawings

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 It is an overall schematic diagram of an embodiment of the utility model;

[0028] Figure 2 is a cross-sectional view of a nozzle valve seat of an embodiment of the utility model;

[0029] Figure 3 Schematic diagram of a nozzle valve seat of an embodiment of the utility model;

[0030] Figure 4 1 is a bottom schematic diagram of a nozzle valve seat of an embodiment of the utility model;

[0031] In the figure:

[0032] 1. Nozzle valve seat; 11. Opening hole; 12. Cylindrical cone hole; 13. Flow hole; 14. Swirl flow channel; 141. First straight hole flow channel; 142. Second straight groove flow channel; 143. Third circular flow channel; 2. Orifice plate; 21. Nozzle outlet. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] The utility model is described in detail below in conjunction with the accompanying drawings. The embodiment discloses a swirl urea nozzle that is easy to process, such as Figure 1 , Figure 2 As shown, it includes a nozzle valve seat 1, at the bottom of which a spray hole plate 2 is fixed; inside the nozzle valve seat 1, an opening hole 11, a cylindrical cone-shaped hole 12, a flow hole 13, and a swirl flow channel 14 are sequentially arranged from top to bottom.

[0035] like Figure 1 As shown, a nozzle outlet 21 is disposed at the center of the spray hole plate 2 , and the spray hole plate 2 and the bottom size of the nozzle valve seat 1 are consistent.

[0036] like Figure 2As shown, the opening hole 11 in the nozzle valve seat 1 is a truncated cone hole with a larger upper part and a smaller lower part. The lower part of the opening hole 11 is connected to a cylindrical truncated cone hole 12, and the cylindrical truncated cone hole 12 is composed of a cylindrical section and an inverted truncated cone section from top to bottom; the lower part of the cylindrical truncated cone hole 12 is connected to a flow-through hole 13; the flow-through hole 13 is not directly connected to the nozzle outlet 21 in the axial direction, but is connected through a swirl flow channel 14. It can be understood that the cylindrical truncated cone hole 12 is used to closely contact the valve stem ball head of the prior art to block the flow-through hole 13.

[0037] In this embodiment, as Figure 2 、 Figure 3 、 Figure 4 shown, the swirl flow channel 14 is composed of a first straight hole flow channel 141, a second straight groove flow channel 142, and a third circular flow channel 143 connected in sequence; among them, one end of the first straight hole flow channel 141 is connected to the flow-through hole 13, and the other end is directly connected to the bottom of the nozzle valve seat 1; the second straight groove flow channel 142 is located at the bottom of the nozzle valve seat 1, as Figure 3 、 Figure 4 shown, the second straight groove flow channel 142 is connected to one end of the first straight hole flow channel located in the nozzle valve seat 1; multiple first straight hole flow channels are uniformly arranged along the circumference of the flow-through hole.

[0038] In this embodiment, as Figure 3 、 Figure 4 shown, a third circular flow channel 143 is also provided at the center of the bottom end of the nozzle valve seat 1; several second straight groove flow channels 142 are uniformly arranged along the circumference of the third circular flow channel 143 and are directly connected to the third circular flow channel 143. It can be understood that the second straight groove flow channel 142 directly cuts into the third circular flow channel 143, which is to enable the urea solution to directly enter a swirling state when flowing from the second straight groove flow channel 142 into the third circular flow channel 143.

[0039] In this embodiment, the second straight groove flow channel 142 and the third circular flow channel 143 are both horizontally arranged, and the number of the third circular flow channels 143 is one. When machining the third circular flow channel 143, only a cylinder needs to be drilled first at the center of the bottom of the nozzle valve seat 1, and then the third circular flow channel 143 can be machined.

[0040] According to the required number of swirl flow channels, a plurality of straight groove flow channels with the same size are uniformly machined along the circumference of the third circular flow channel 143 at the bottom of the nozzle valve seat 1, and then the second straight groove flow channel 142 can be machined; then, taking the connection line between the end of each second straight groove flow channel 142 far from the third circular flow channel 143 and the flow-through hole 13 as the trajectory of the first straight hole flow channel 141, the first straight hole flow channel 141 can be machined; thus, it can be seen that the machining difficulty of the nozzle valve seat 1 in this embodiment is relatively small.

[0041] It can be understood that the number of swirl channels can be multiple, and the multiple swirl channels are evenly distributed along the circumferential direction of the flow hole 13. In this embodiment, the number is three, and in other embodiments, it can be 4, 5, 6, etc.

[0042] Working principle:

[0043] The urea pump transports the urea with stable pressure into the urea nozzle. When the urea reaches the nozzle valve seat, the urea will maintain the pressure. After the ECU (Electronic Control Unit) sends an instruction, the urea nozzle will spray the urea aqueous solution regularly and quantitatively. At this time, the urea first flows along the first straight hole flow channel 141 of the nozzle valve seat 1 to reach the bottom of the valve seat and enter the second straight groove flow channel 142, and then moves along the second straight groove flow channel 142 on the bottom plane of the valve seat, and finally enters the circular surface of the third circular flow channel 143 along the tangential direction. Under the action of the circular surface of the third circular flow channel 143, the urea is forced to swirl, and the urea converts the pressure energy into rotational kinetic energy;

[0044] Then the urea aqueous solution returns to the nozzle outlet 21 of the spray hole plate 2. When the jet flow detaches from the nozzle outlet 21, it is converted into an outward radial velocity under the action of centrifugal force, and then undergoes two breakages to achieve the atomization effect. The primary breakage occurs at the initial stage of liquid breakage. The unstable waves on the gas-liquid interface grow and cause the liquid film to break. The appearance of tiny forms such as droplets, filaments, and films on the liquid surface marks the breakage of the liquid film. The size of the breakage is related to the nozzle structure, air flow state, and environmental state, and the size is generally in the millimeter or centimeter order of magnitude. The primary breakage process is the initial condition for the secondary breakage. The droplets generated by the primary breakage are decelerated, deformed, and broken under the dual action of air resistance and centrifugal force. This process is called the secondary breakage. After the two breakage processes, the atomized droplets are generally in the range of dozens to more than one hundred micrometers, which can achieve a relatively good atomization effect.

[0045] The flow channel structure of the nozzle valve seat of the present utility model has the following main advantages:

[0046] (1) Optimize and improve the structure of the swirl channel. The structure is relatively simple, the processing difficulty is low, and the mass production difficulty is small; reduce the change amount of the nozzle assembly, and several straight channels and a cylinder can be directly processed on the valve seat of the existing nozzle to achieve swirl;

[0047] (2) Through simulation calculation, the swirl intensity is relatively high, the atomization effect is good, and the treatment of NOx and anti-crystallization are improved;

[0048] (3) The flow channel is relatively short, and the energy loss is relatively low.

[0049] Although the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative efforts on the basis of the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. An easy-to-process swirl urea nozzle, characterized in that: It includes a nozzle valve seat, at the bottom of which a spray hole plate is fixed; the inside of the nozzle valve seat is provided with an opening hole, a cylindrical cone-shaped hole, a flow hole, and a swirl flow channel in sequence from top to bottom; the swirl flow channel includes a first straight hole flow channel, a second straight groove flow channel, and a third circular flow channel connected in sequence; the urea solution will first enter the first straight hole flow channel of the swirl flow channel from the flow hole, then enter the second straight groove flow channel, and finally swirl in the third circular flow channel.

2. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: A nozzle outlet is arranged at the center of the spray hole plate, and the bottom size of the spray hole plate is consistent with that of the nozzle valve seat.

3. The easy-to-process swirl urea nozzle according to claim 2, characterized in that: The flow hole is not directly connected to the nozzle outlet in the axial direction, but is connected through a swirl flow channel.

4. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: The number of the swirl flow channels is multiple, but the number of the third circular flow channel is only one.

5. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: One end of the first straight hole flow channel is connected to the flow hole, and the other end is directly connected to the bottom of the nozzle valve seat.

6. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: The second straight groove flow channel is located at the bottom of the nozzle valve seat, and the second straight groove flow channel is connected to the first straight hole flow channel and is located at one end of the nozzle valve seat.

7. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: The third circular flow channel is arranged at the center of the bottom end of the nozzle valve seat.

8. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: A plurality of the second straight groove flow channels are evenly arranged along the circumference of the third circular flow channel and are tangentially connected to the third circular flow channel.

9. The easy-to-process swirl urea nozzle according to claim 1, characterized in that: The plurality of first straight hole flow channels are evenly arranged along the circumference of the flow hole.

Images