End cover side feeding type mixer

Abstract

The utility model provides an end cover side inlet type mixer which comprises an end cover shell, and the end cover shell comprises an opening end and a side inlet end, a closed end; the first open hole and the second open hole are respectively and independently formed in the cylinder body; a rotational flow pipe, a first baffle and a second baffle are arranged in the inner cavity, and the rotational flow pipe is provided with a top pipe opening, a bottom pipe opening and a plurality of side openings formed in the side wall of the rotational flow pipe; a first cavity is formed among the first baffle, the barrel, the closed end and the second baffle, the second open hole is an inlet for gas to flow into the first cavity, the side opening is an outlet for gas to flow out of the first cavity, a second cavity is formed among the first baffle, the barrel, the open end and the second baffle, and the bottom pipe opening is an inlet for gas to flow into the second cavity. The opening end is an outlet through which gas flows out of the second cavity, so that the gas flowing in from the side opening and a reducing agent sprayed by the nozzle are mixed in the rotational flow pipe and then flow out through the bottom pipe opening and the opening end in sequence. The device is compact in space, low in back pressure, good in mixing effect and excellent in anti-crystallization performance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the tail gas treatment technical field, specifically relates to a end cover side -in type mixer. BACKGROUND

[0002] With the continuous upgrading of domestic diesel vehicle emission regulations, more stringent requirements are put forward for the automobile exhaust aftertreatment system and its core component mixer. As a key component in the aftertreatment system, the performance of the mixer directly affects the emission of NOx.

[0003] The mixer needs to ensure that the exhaust gas and the reducing agent (such as urea solution) are fully mixed to improve the conversion efficiency of the SCR system. The mixer also needs to have good heat exchange performance to ensure that the urea solution is rapidly vaporized and fully mixed with the exhaust gas during the injection process, which helps to improve the conversion efficiency of the SCR system and reduce urea consumption. Since the "national six" standard has more stringent emission limits for low temperature and low load conditions, and the injection amount is increased, the risk of crystallization of the mixer is increased. The generation of a large amount of crystallization will block the aftertreatment channel, causing the back pressure of the aftertreatment system to rise, the vehicle power to be insufficient, and there is a risk of exceeding the regulatory limits of emissions.

[0004] With the upgrading of diesel engine national seven regulations, urea double injection system is one of the important solutions. Compared with national six aftertreatment, urea injection needs to be added at the inlet of the aftertreatment, and the front mixer and SCR catalyst need to be added, which poses a great challenge to the boundary of the aftertreatment system. The common technical solution is to add a simple mixer in the front exhaust pipe, which has many shortcomings: the mixing effect is not ideal, the back pressure is high, and the urea crystallization is easy. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides an end cover side-in type mixer with high integration, compact space, low back pressure, good mixing effect and excellent anti-crystallization performance.

[0006] To solve the above technical problems, the utility model provides an end cover side-in type mixer, which mainly comprises an end cover shell, wherein the end cover shell comprises:

[0007] An open end, which is the gas outlet of the mixer;

[0008] A closed end opposite to the open end;

[0009] A cylinder body located between the open end and the closed end, a first opening and a second opening are independently arranged on the cylinder body, the first opening is used for mounting a nozzle, and the second opening is the gas inlet of the mixer;

[0010] An inner cavity, a cyclone tube, a first baffle and a second baffle are arranged in the inner cavity, the cyclone tube has a top tube opening, a bottom tube opening and a plurality of side openings arranged in the side wall of the cyclone tube;

[0011] The top tube opening is used for receiving the reducing agent sprayed by the nozzle.

[0012] The first baffle is located between the opening end and the cyclone tube, the second baffle is installed on the bottom tube opening, the first baffle, the cylinder, the closed end and the second baffle form a first cavity, the second opening is an inlet for gas flowing into the first cavity, the side opening is an outlet for gas flowing out of the first cavity, the first baffle, the cylinder, the opening end and the second baffle form a second cavity, the bottom tube opening is an inlet for gas flowing into the second cavity, and the opening end is an outlet for gas flowing out of the second cavity, so that the gas flowing from the side opening mixes with the reducing agent sprayed by the nozzle in the cyclone tube and then flows out through the bottom tube opening and the opening end in sequence.

[0013] Preferably, the vertical projection of the second baffle covers the bottom tube opening, and there is a spacing space between the second baffle and the inner wall of the cylinder corresponding to the position of the bottom tube opening, the gas entering from the second opening heats the second baffle through the spacing space in the first cavity.

[0014] Preferably, the second baffle has a mounting portion and an arc-shaped blocking portion, the arc-shaped blocking portion extends obliquely downward from a part of the mounting portion and extends to the inner wall of the cylinder, and the high-temperature gas entering from the second opening heats the arc-shaped blocking portion through the spacing space.

[0015] Preferably, the first baffle has a circular arc portion matched with the cyclone tube, the circular arc portion of the first baffle forms a circular arc space with the cyclone tube, and the circular arc space is used for forming a cyclone.

[0016] Preferably, the side opening includes a plurality of first side openings and a plurality of second side openings, the first side openings extend along the longitudinal axis of the cyclone tube, the first side openings are distributed on the side surface away from the closed end in the side wall of the cyclone tube, and the longitudinal length of the first side opening is 0.1 to 0.99 times the longitudinal length of the side wall of the cyclone tube; the second side openings are located above the first side openings, and the second side openings are distributed on the side wall of the cyclone tube.

[0017] Preferably, at least one of the first side openings is provided with a vane, and the vane is at a preset angle with the side wall of the cyclone tube.

[0018] Preferably, the central axis of the second opening overlaps or is parallel to the central axis of the first opening after rotating 5° to 355° around the longitudinal axis of the cylinder.

[0019] Preferably, the longitudinal axis of the cyclone tube is at a preset angle with the longitudinal axis of the cylinder, and the preset angle is 60° to 120°.

[0020] Preferably, the open end is provided with an air outlet baffle, the air outlet baffle has a first blocking part and a second blocking part located above the first blocking part, the first blocking part is used for completely blocking the area of the open end corresponding to the first blocking part to close the bottom of the air outlet, and the second blocking part is provided with a plurality of third openings, so that the second blocking part partially blocks the area of the open end corresponding to the second blocking part.

[0021] The end cover side-in type mixer can be applied to a national six SCR system and a national seven front stage and rear stage SCR system, has high integration, compact space, low back pressure, good mixing effect and excellent crystallization prevention performance. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an exploded view of the end cover side-in type mixer.

[0023] Figure 2 It is a perspective view of the end cover side-in type mixer.

[0024] Figure 3 It is a working principle diagram of the end cover side-in type mixer.

[0025] Figure 4 It is a position description diagram of the first opening and the second opening of the end cover side-in type mixer. DETAILED DESCRIPTION

[0026] In order to make the technical problems solved by the utility model more clear, the utility model is further illustrated below in combination with examples and drawings. The specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0027] As Figures 1 to 4As shown, it is the embodiment of the end cover side inlet type mixer of the utility model, reduce system back pressure, save design space, reduce urea crystallization, improve urea and exhaust gas mixing efficiency and De-NOx conversion efficiency.The mixer includes end cover shell 1, the end cover shell 1 includes: open end 11, closed end, cylinder 1 and the inner cavity formed by open end 11, closed end, cylinder 1, the open end 11 is the gas outlet of the mixer;Closed end, with the open end 11 opposite, in this embodiment, the closed end is formed by the end cover 4 closing the cylinder end portion;Cylinder 1 is located between the open end 11 and the closed end, and the cylinder 1 is a cylindrical cylinder with a longitudinal axis.Each of the first opening 9 and the second opening 10 is independently arranged on the cylinder 1, the first opening 9 is used for mounting the nozzle 2, and the second opening 10 is the gas inlet of the mixer, and the second opening 10 can be mounted with the inlet pipe 7.

[0028] The inner cavity is provided with a cyclone tube 6, a first baffle 3 and a second baffle 5, the cyclone tube 6 has a top pipe opening, a bottom pipe opening and a plurality of side openings formed in the side wall of the cyclone tube, the cyclone tube can form a cyclone effect, and can contact and mix with the reducing agent sprayed by the nozzle, wherein the top pipe opening is used for receiving the reducing agent sprayed by the nozzle 2.

[0029] As shown in the figure, Figures 1 to 3 The first baffle 3 is located between the open end 11 and the cyclone tube 6, and the second baffle 5 is mounted on the bottom pipe opening.

[0030] As shown in the figure, Figure 2 The first baffle 3, the cylinder 1, the closed end and the second baffle 5 form a first cavity 15, for the first cavity 15, the second opening 10 is the inlet of the gas flowing into the first cavity 15, and the side opening is the outlet of the gas flowing out of the first cavity 15.

[0031] As shown in the figure, Figure 2 The first baffle 3, the cylinder 1, the open end 11 and the second baffle 5 form a second cavity 14, for the second cavity 14, the bottom pipe opening is the inlet of the gas flowing into the second cavity, and the open end 11 is the outlet of the gas flowing out of the second cavity, so that the gas flowing from the side opening and the reducing agent sprayed by the nozzle are mixed in the cyclone tube, heat exchange occurs in the cyclone tube, urea is evaporated into ammonia gas, and then flows out through the bottom pipe opening and the open end in turn.

[0032] In the mixer of the utility model, Figure 1 And Figure 2As shown, the vertical projection of the second baffle 5 covers the bottom pipe opening, and there is a spacing space 17 between the second baffle 5 and the inner wall of the cylinder body 1 corresponding to the bottom pipe opening. Figure 3 As shown, the gas entering from the second opening 10 heats the second baffle 5 in the first cavity through the spacing space 17.

[0033] Based on the mixer structure of the utility model, the gas inlet of the mixer enters the outside of the second baffle of the mixer, the inside of the second baffle is a high-risk area of crystallization of the mixer, the high-temperature gas wraps the outside of the second baffle, and the second baffle is heated from the outside, which is beneficial to the removal of the inside crystallization.

[0034] Specifically, as shown in Figure 1 and Figure 2 As shown, the second baffle 5 has a mounting portion 16 and an arc-shaped blocking portion, the arc-shaped blocking portion extends obliquely downward from a part of the mounting portion 16 and extends to the inner wall of the cylinder body 1, and the high-temperature gas entering from the second opening 10 heats the arc-shaped blocking portion through the spacing space. The arc-shaped blocking portion can also be a bowl-shaped blocking portion.

[0035] As shown in Figures 1 to 3 As shown, the first baffle 3 has a circular arc portion matched with the cyclone pipe 6, and the circular arc portion of the first baffle 3 forms a circular arc space with the cyclone pipe 6, and the circular arc space is used for forming a cyclone.

[0036] As shown in Figures 1 to 3 As shown, the side opening includes a plurality of first side openings 13 and a plurality of second side openings 12, the first side openings 13 extend along the longitudinal axis of the cyclone pipe 6, the first side openings 13 are distributed on the side surface of the side wall of the cyclone pipe 6 away from the closed end, and the longitudinal length of the first side openings 13 is 0.1 to 0.99 times the longitudinal length of the side wall of the cyclone pipe 6; the second side openings 12 are located above the first side openings, and the second side openings 12 are distributed on the side wall of the cyclone pipe.

[0037] The gas in the first cavity can enter the cyclone pipe through the second side opening, or can enter the cyclone pipe through the first side opening, and the gas entering through the first side opening further enhances the cyclone effect.

[0038] As shown in Figure 1 and Figure 2 As shown, part of the first side openings 13 are provided with blades, and the blades are at a preset angle with the side wall of the cyclone pipe 6, wherein the blades can be directed inward or outward.

[0039] As shown in Figure 4As shown, the central axis 18 of the second opening 10 overlaps the central axis 19 of the first opening 9 after rotating 5° to 355° around the longitudinal axis of the cylinder body 1, that is, the included angle between the second opening and the first opening is between 5° and 355° in the cross section of the cylinder body. Alternatively, the position of the second opening 10 can also be adjusted so that the central axis 18 of the second opening 10 is parallel to the central axis 19 of the first opening 9 after rotating 5° to 355° around the longitudinal axis of the cylinder body 1.

[0040] The longitudinal axis of the cyclone pipe 6 is at a preset angle with the longitudinal axis of the cylinder body 1, and the preset angle is 60°-120°, preferably about 90°. The cyclone pipe can be a circular pipe body, an elliptical pipe body, or other similar shaped pipe body.

[0041] As shown in the drawings, Figures 1 to 3 As shown, the open end is provided with an air outlet baffle 8, the air outlet baffle 8 has a first blocking part and a second blocking part above the first blocking part, the first blocking part is used to completely block the area of the open end corresponding to the first blocking part, to block the bottom of the air outlet, and the second blocking part is provided with a plurality of third openings, so that the second blocking part partially blocks the area of the open end corresponding to the second blocking part.

[0042] The end cover side-in type mixer can be applied to the national six SCR system and the national seven front stage and rear stage SCR system, has high integration, compact space, low back pressure, good mixing effect, and excellent crystallization prevention performance.

[0043] The above is a specific embodiment of the present application, and does not constitute a limitation on the protection scope of the present application. Any modification and deformation within the technical concept of the present application shall be included in the protection scope of the present application.

Claims

1. A side entry end cap mixer characterized by, The end cover shell comprises: an open end as an air outlet of the mixer; a closed end opposite to the open end; a barrel between the open end and the closed end, a first opening and a second opening are independently arranged on the barrel, the first opening is used for mounting a nozzle, and the second opening is an air inlet of the mixer; an inner cavity, a cyclone tube, a first baffle and a second baffle are arranged in the inner cavity, the cyclone tube has a top tube opening, a bottom tube opening and a plurality of side openings arranged in the side wall of the cyclone tube; the top tube opening is used for receiving the reducing agent sprayed by the nozzle; the first baffle is located between the open end and the cyclone tube, the second baffle is mounted on the bottom tube opening, a first cavity is formed between the first baffle, the barrel, the closed end and the second baffle, the second opening is an inlet of the gas flowing into the first cavity, the side opening is an outlet of the gas flowing out of the first cavity, a second cavity is formed between the first baffle, the barrel, the open end and the second baffle, the bottom tube opening is an inlet of the gas flowing into the second cavity, and the open end is an outlet of the gas flowing out of the second cavity, so that the gas flowing from the side opening and the reducing agent sprayed by the nozzle are mixed in the cyclone tube and then flow out through the bottom tube opening and the open end in sequence.

2. The end cap side entry mixer of claim 1, wherein A vertical projection of the second baffle covers the bottom tube opening, and there is a spacing space between the second baffle and the inner wall of the barrel corresponding to the position of the bottom tube opening, and the gas entering from the second opening heats the second baffle through the spacing space in the first cavity.

3. The end cap side entry mixer of claim 2, wherein, The second baffle has a mounting portion and an arc-shaped resisting portion, the arc-shaped resisting portion extends obliquely downward from a part of the mounting portion and extends to the inner wall of the barrel, and the high-temperature gas entering from the second opening heats the arc-shaped resisting portion through the spacing space.

4. The end cap side entry mixer of claim 1, wherein The first baffle has a circular arc portion matched with the cyclone tube, the circular arc portion of the first baffle forms a circular arc space with the cyclone tube, and the circular arc space is used for forming a cyclone.

5. The end cap side entry mixer of claim 1 or 4, wherein, The side opening comprises a plurality of first side openings and a plurality of second side openings, the first side openings extend along the longitudinal axis of the cyclone tube, the first side openings are distributed on the side surface of the side wall of the cyclone tube away from the closed end, the longitudinal length of the first side opening is 0.1 to 0.99 times the longitudinal length of the side wall of the cyclone tube, and the second side openings are located above the first side openings and are distributed on the side wall of the cyclone tube.

6. The end cap side entry mixer of claim 5, wherein, At least one of the first side openings is provided with a vane, and the vane is at a preset angle with the side wall of the cyclone tube.

7. The end cap side entry mixer of claim 1, wherein The central axis of the second opening is rotated around the longitudinal axis of the barrel by 5° to 355° and overlaps or is parallel to the central axis of the first opening.

8. The end cap side entry mixer of claim 1, wherein, The longitudinal axis of the cyclone tube and the longitudinal axis of the barrel body form a preset angle, and the preset angle is 60°-120°.

9. The end cap side entry mixer of claim 1, wherein, The open end is provided with an air outlet baffle, the air outlet baffle has a first blocking part and a second blocking part located above the first blocking part, the first blocking part is used for completely blocking the area of the corresponding open end of the first blocking part to close the bottom of the air outlet, and the second blocking part is provided with a plurality of third openings, so that the second blocking part partially blocks the area of the corresponding open end of the second blocking part.

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