CN213116434U - Novel post-treatment nozzle cooling device - Google Patents
Novel post-treatment nozzle cooling device Download PDFInfo
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- CN213116434U CN213116434U CN202020641173.2U CN202020641173U CN213116434U CN 213116434 U CN213116434 U CN 213116434U CN 202020641173 U CN202020641173 U CN 202020641173U CN 213116434 U CN213116434 U CN 213116434U
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Abstract
The utility model provides a novel aftertreatment nozzle cooling device, includes a reductant nozzle, a cooling water jacket, a nozzle fixed bolster, the reductant nozzle includes an injection portion, the cooling water jacket includes a nozzle mounting hole, a cooling water cavity coaxial with the nozzle mounting hole, a water inlet channel and a water outlet channel, the injection portion of nozzle is installed in the nozzle mounting hole, and is fixed through the nozzle fixed bolster, and the cooling liquid encircles the injection portion in the cooling water cavity, gets into by the water inlet channel, and water outlet channel output circulates to the protection nozzle does not receive high temperature damage.
Description
Technical Field
The invention belongs to the field of engine emission control, and particularly relates to a urea liquid supply metering system of an engine exhaust selective reduction (SCR) technology.
Background
Selective Catalytic Reduction (SCR) technology is one of the most effective aftertreatment technologies currently known to reduce the emission of nitrogen oxides in diesel engine exhaust. The SCR technology is to inject a urea aqueous solution of 32.5% by weight concentration quantitatively into the exhaust gas of a diesel engine, decompose the exhaust gas into ammonia gas at high temperature, mix the ammonia gas with the exhaust gas, and then enter an SCR catalytic converter, where the ammonia gas and NOx in the engine exhaust gas undergo catalytic reduction reaction under the action of a catalyst, so that the NOx is decomposed into harmless N2 and H2O.
Because the reducing agent nozzle of the SCR system is directly arranged on the exhaust pipe, particularly the electromagnetic driving nozzle has higher requirements on the temperature resistance of the reducing agent nozzle. In addition, in the aftertreatment system equipped with a DPF (diesel Particulate filter) regeneration device, the temperature of the DPF and the SCR catalyst, etc. is further increased due to the regeneration process, and a nozzle for the reducing agent disposed downstream of the DPF needs to withstand a higher temperature, which may directly affect the operation of the SCR system and even cause the nozzle to melt or explode.
At present, most of cooling measures for the reducing agent nozzle adopt an air cooling structure, nozzle cooling is realized by a mode of additionally arranging an external cooling fin at a spraying end, but the air cooling mode is low in cooling efficiency and cannot achieve a good cooling effect, particularly for an after-treatment system specified by national six regulations, the temperature resistance of the nozzle needs to reach more than 800 ℃, and the cooling structure can not effectively reduce the temperature.
For the reducing agent nozzle partially adopting a water cooling structure, due to structural limitation of the nozzle, the temperature of cooling water can be instantly increased under the condition of high-temperature shutdown, the heat resistance of the nozzle cannot be met, an additional cooling auxiliary device is required or the design structure of the nozzle is changed, and the cost is increased.
Disclosure of Invention
The present application is directed to the above-mentioned problems, and an object of the present application is to provide a post-treatment nozzle cooling device with simple structure, good environmental adaptability, and easy installation.
In order to achieve the purpose, the invention adopts the following technical scheme: a novel reducing agent nozzle cooling device comprises a reducing agent nozzle, a cooling water jacket and a nozzle fixing support.
The reducing agent nozzle includes an injection portion. The cooling water jacket comprises a nozzle mounting hole, a cooling water cavity coaxial with the nozzle mounting hole, a water inlet channel and a water outlet channel. The nozzle support is in an inverted U shape and comprises two lip eaves with fixing holes. The spraying part of the nozzle extends into the nozzle mounting hole, the fixing support is buckled on the nozzle, the lip brim is tightly attached to the cooling water jacket, and the lip brim penetrates through the fixing hole in a threaded manner and is tightly fixed on the cooling water jacket. The nozzle and the cooling water jacket are sealed by a sealing element to prevent the cooling water solution from leaking, and the sealing element is generally designed to resist the temperature of 300 ℃ and above.
The cooling liquid in the cooling water cavity surrounds the spraying part, enters from the water inlet channel, and is output from the water outlet channel for circulation, so that the nozzle is protected from being damaged by high temperature.
The axial included angle between the water inlet channel and the water outlet channel can be designed to be less than 180 degrees. The cooling water cavity comprises a boss, and the boss is arranged between the water inlet channel and the water outlet channel to prevent cooling water from directly flowing out of the water outlet channel and ensure effective circulation of internal liquid.
Furthermore, in order to ensure that no liquid is retained in the cooling water cavity, the sectional area of the cooling water cavity is designed to be smaller than that of the water inlet channel.
The spraying part is made of metal materials, so that the nozzle can still work normally when the cooling water does not work, such as a high-temperature shutdown state.
The novel post-treatment nozzle cooling device further comprises a nozzle mounting seat and a nozzle mounting gasket. The nozzle mounting seat can be integrally designed with the cooling water jacket and comprises a positioning hole and a ring groove. The nozzle mounting gasket includes a snap, a raised rim. The nozzle mounting gasket is connected to the annular groove through a buckle, the raised annular edge faces the bottom surface of the nozzle, the nozzle is mounted on the exhaust pipe through a mounting seat and is fastened by bolts, and the raised edge is attached to the bottom edge of the nozzle, so that a sealing surface is formed.
The following technical solutions further define or optimize the present application.
Drawings
FIG. 1 is a schematic structural diagram of a novel aftertreatment nozzle cooling device according to an embodiment of the invention.
FIG. 2 is a schematic view of a flow passage structure of a cooling water chamber of the novel post-treatment nozzle cooling device provided by the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
The novel aftertreatment nozzle cooling device provided by the application, as shown in fig. 1, comprises a reducing agent nozzle 108, a cooling water jacket 100, a nozzle fixing bracket 112, a nozzle mounting seat 106 and a nozzle mounting gasket 101. The reducing agent nozzle 108 includes an injection portion 107 and a main body 109. The cooling water jacket 100 comprises a nozzle mounting hole 116, a nozzle fixing threaded hole 114, a cooling water cavity 200 coaxial with the nozzle mounting hole 116, and a water inlet channel 204 and a water outlet channel 202 which are communicated with the cooling water cavity 200. As shown in fig. 2, the included angle between the axes of the water inlet 204 and the water outlet 202 may be less than 180 °, and the water inlet 205 and the water outlet 203 are respectively installed, and the water inlet 205 and the water outlet 203 are designed according to the standard of a quick connector. The sectional area of the cooling water chamber 200 is smaller than that of the water inlet channel 204 to ensure that no liquid remains in the cooling water chamber 200. In addition, the cooling water cavity 200 includes a boss 201, and the boss 201 is disposed between the water inlet channel 204 and the water outlet channel 202, near one side of the water outlet channel 202, to prevent the cooling water from directly flowing out from the water outlet channel 202, and to ensure effective circulation of the internal liquid.
The nozzle fixing bracket 112 is used for mounting and fixing the reducing agent nozzle 108, and the nozzle fixing bracket 112 is in an inverted U shape and includes two lip eaves 110 with fixing holes 110 a. The injection part 107 of the reducing agent nozzle 108 extends into the nozzle mounting hole 116, the nozzle main body 109 is partially positioned at the upper end of the cooling water jacket 100, the reducing agent nozzle 108 is fastened by the nozzle fixing bracket 112, the bottom surface 110b of the lip 110 is tightly attached to the threaded hole plane 114a of the cooling water jacket 100, the fixing bolt 111 passes through the fixing hole 110a and is locked in the nozzle fixing threaded hole 114, so that the reducing agent nozzle 108 is mounted on the cooling water jacket 100.
The nozzle mount 106 may be integrally formed with the cooling water jacket 100 by an integral process or injection molding. The nozzle mount 106 includes a positioning hole 105 and a ring groove 104. The nozzle mounting pad 101 may be stamped from a sheet of metal and includes a snap 103, a raised rim 102. The buckle 103 comprises a raised elastic sheet 103a, the buckle 103 is pressed into the nozzle mounting seat 106, and the elastic sheet 103a is buckled into the annular groove 104. The reducing agent nozzle 108 is mounted on the exhaust pipe (not shown) through the positioning hole 105 and tightened by the bolt 117, so that the annular edge 102 is tightly attached to the bottom surface of the reducing agent nozzle 108, thereby forming a sealing surface, and the bolt 117 is basically uniformly distributed in the circumferential direction (the rest are not shown) in order to ensure uniform stress.
When the engine cooling water works, the cooling water enters from the water inlet channel 204, passes through the cooling water cavity 200, is output from the water outlet channel 202, circulates, and surrounds the injection part 107 with the cooling liquid in the cooling water cavity 200, so that the reducing agent nozzle 108 is protected from being damaged by high temperature. The reducing agent nozzle 108 and the cooling water jacket 100 are sealed by a sealing element 115 to prevent the cooling water solution from leaking, and the sealing element 115 can resist the temperature of 300 ℃ and above.
The injection part 107 is made of a metal material, and ensures that the reducing agent nozzle 108 can still work normally when the cooling water does not work. For example, in a high-temperature shutdown state, the temperature of water in the cooling water cavity 200 is relatively increased, and at this time, the reducing agent nozzle 108 is designed to be resistant to high temperature, so as to avoid high-temperature damage. Throughout the process, the temperature of the injection portion 107 of the reducing agent nozzle 108 is lower than the temperature of the liquid in the cooling water chamber 200.
The above examples are only for illustrating the essence of the present invention, but not for limiting the present invention. Any modifications, simplifications, or other alternatives made without departing from the principles of the invention are intended to be included within the scope of the invention.
The present invention is not concerned with parts which are the same as or can be implemented using prior art techniques.
Claims (7)
1. The utility model provides a novel aftertreatment nozzle cooling device, includes a reductant nozzle, a cooling water jacket, a nozzle fixed bolster, its characterized in that, the reductant nozzle includes a injection portion, the cooling water jacket includes a nozzle mounting hole, a cooling water cavity coaxial with the nozzle mounting hole, a water inlet channel and a water outlet channel, the injection portion of nozzle is installed in the nozzle mounting hole, and is fixed through the nozzle fixed bolster, and the cooling liquid encircles injection portion in the cooling water cavity, gets into by the water inlet channel, and water outlet channel output circulates to the protection nozzle does not receive high temperature damage.
2. The novel aftertreatment nozzle cooling device of claim 1 wherein the inlet channel and the outlet channel have an included axis angle of less than 180 °.
3. A novel aftertreatment nozzle cooling device as claimed in claim 2 wherein said cooling water chamber includes a boss disposed between said inlet and outlet channels to ensure effective circulation of internal fluid.
4. A novel aftertreatment nozzle cooling arrangement in accordance with claim 3 wherein the cooling water chamber has a cross-sectional area less than the cross-sectional area of the water inlet passageway.
5. The novel aftertreatment nozzle cooling device of claim 1, wherein the nozzle is sealed from the cooling jacket by a seal to prevent coolant from leaking.
6. A novel aftertreatment nozzle cooling device in accordance with claim 5 wherein said nozzle tip is formed of a metallic material.
7. The novel aftertreatment nozzle cooling device of any one of claims 1-6, comprising a nozzle mount configured to be integrated with a cooling jacket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020641173.2U CN213116434U (en) | 2020-04-25 | 2020-04-25 | Novel post-treatment nozzle cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020641173.2U CN213116434U (en) | 2020-04-25 | 2020-04-25 | Novel post-treatment nozzle cooling device |
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| CN213116434U true CN213116434U (en) | 2021-05-04 |
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| CN202020641173.2U Active CN213116434U (en) | 2020-04-25 | 2020-04-25 | Novel post-treatment nozzle cooling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060126A (en) * | 2021-11-08 | 2022-02-18 | 凯龙高科技股份有限公司 | Urea metering and spraying device |
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2020
- 2020-04-25 CN CN202020641173.2U patent/CN213116434U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060126A (en) * | 2021-11-08 | 2022-02-18 | 凯龙高科技股份有限公司 | Urea metering and spraying device |
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