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Split urea metering nozzle structure

A split-type, urea technology, applied in mufflers, exhaust treatment, engine components, etc., can solve the problems of high processing and welding positioning process requirements, poor atomization quality, small injection aperture, etc., and it is easy to achieve key dimensions and tolerances. Control, easy to manufacture, good performance

Inactive Publication Date: 2016-12-21
WUXI WEIFU HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two forms of urea metering unit: pressure type and swirl atomization. Due to the low-pressure injection, the pressure type has the disadvantages of poor atomization quality, difficulty in ensuring atomization consistency, small spray aperture and easy blockage. The existing swirl mist Most of the transformation methods adopt the form of split pressing and welding, which makes it difficult to guarantee the sealing between the valve core and the seat surface, and requires high processing and welding positioning technology.

Method used

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  • Split urea metering nozzle structure
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  • Split urea metering nozzle structure

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Such as figure 1 with figure 2 As shown, a split-type cone-surface sealed urea metering nozzle structure includes a valve stem 128, a sheath 132 and a swirl nozzle 133, and a swirl nozzle 133 is fixed inside the lower end of the sheath 132, and the swirl nozzle 133 The center hole 146 of the swirl nozzle is opened along its axial direction, and the lower end of the swirl nozzle 133 is provided with a spray hole 145, and the upper end wall body of the spray hole 145 and the lower end wall body of the swirl nozzle middle hole 146 Connected through the inner sealing surface 141, an annular protrusion is integrally connected on the inner wall of the sheath 132, and a valve stem 128 is slidably and sealingly connected in the center hole of the annular protrusion. The lower end of the valve stem 128 has an outer sealing surface 148, and the outer sealing The surface 148 cooperates with the inner sealing surface 141, and a valve stem flow channel 131 is opened in the valve s...

Embodiment 2

[0030] Such as image 3 , Figure 4 with Figure 5 As shown, a split-type ball-sealed urea metering nozzle structure includes a valve stem 128, a sheath 132 and a swirl nozzle 133. A swirl nozzle 133 is fixed inside the lower end of the sheath 132. Inside the swirl nozzle 133 A middle hole 146 of the swirl nozzle is provided along its axial direction, and a nozzle hole 145 is provided at the lower end of the swirl nozzle 133, and the upper end wall of the nozzle hole 145 passes through the wall body of the lower end of the middle hole 146 of the swirl nozzle. The inner sealing surface 141 is connected, the valve stem 128 is installed in the sheath 132, the solution storage chamber 139 is formed between the outer circle of the valve stem 128 and the inner circle of the sheath 132, and a sealing ball 129 is fixed at the lower end of the valve stem 128 , the sealing ball 129 cooperates with the inner sealing surface 141, and a valve stem flow channel 131 is opened in the valve ...

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Abstract

The invention relates to a split type urea metering nozzle structure, which includes a valve stem, a sheath and a swirl nozzle. The middle hole of the swirl nozzle is provided with a nozzle hole at the lower end of the swirl nozzle, and the upper end wall of the nozzle hole is connected with the lower end wall of the middle hole of the swirl nozzle through an inner sealing surface. There is an annular groove for the nozzle along its circumference, and a vertical groove for the nozzle is arranged on the outer wall of the swirling nozzle above the annular groove of the nozzle. The lower end of the vertical groove of the nozzle communicates with the annular groove of the nozzle. A swirl hole is opened on the flow spray head. The invention has the advantages of convenient processing and manufacturing, easy control of key dimensions and tolerances, good performance and the like.

Description

technical field [0001] The invention relates to a nozzle structure, in particular to a split type urea metering nozzle structure. Background technique [0002] In the prior art, there are many exhaust after-treatment systems for reducing exhaust pollutants of internal combustion engines. Among them, the SCR (Selective Catalytic Reduction) urea injection system, as one of the exhaust after-treatment devices for reducing nitrogen oxides in exhaust, has become a popular choice for medium- and heavy-duty vehicles. Mainstream technical solutions that meet China IV and above emission regulations. The principle is to reduce the nitrogen oxides in the exhaust gas to nitrogen and water by injecting urea solution into the exhaust gas of the diesel engine under the action of high temperature and catalyst. The urea solution is sprayed into the exhaust pipe through the metering unit. The metering unit directly affects the conversion efficiency of nitrogen oxides and is an important devi...

Claims

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Application Information

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IPC IPC(8): F01N3/20
CPCF01N3/2073F01N2610/1453
Inventor 张坤磊崔震霆李刚孙天旗
Owner WUXI WEIFU HIGH TECH CO LTD