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Strainer

A coarse filter and main body technology, which is applied in the field of coarse filter, can solve the problems of urea water back-spraying, labor and cost, and achieve the effect of preventing back-spraying

Active Publication Date: 2020-02-21
YAMASHIN FILTER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to remove the sensor unit from the urea water tank and maintain it, it will take time and money, so it is desirable to remove the dust in the urea water at a position upstream of the filter in the urea water tank, but remove the dust when filling the tank with water, for example In some cases, backspray of urea water may occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0026] figure 1 It is an overall configuration diagram showing the overall configuration of the urea SCR system 1 according to the first embodiment of the present invention. exist figure 1 In , the double-dashed line schematically shows the flow of urea water.

[0027] The urea SCR system 1 mainly includes: an exhaust unit that discharges exhaust gas from an engine of an automobile (not shown); and a urea water supply unit.

[0028] The exhaust section mainly includes a continuous regenerative PM removal filter (not shown) that traps PM (Particulate Matter) in the exhaust gas, an exhaust pipe 101, and promotes the reduction reaction of NOx to treat the exhaust gas. A purifying catalyst (not shown) and an exhaust pipe (not shown) are provided in this order from the upstream side of the exhaust gas.

[0029] An aqueous solution containing ammonia serving as a NOx reducing agent (hereinafter referred to as urea water) is sprayed and supplied from the nozzle 4 to the exhaust pi...

no. 2 approach

[0057] In the first embodiment, the front end portion 23b made of a material impervious to urea water is integrally formed with the front end cylinder 232 so as to protrude toward the hollow portion of the prefilter body 23a, but the form of the front end portion is not limited thereto.

[0058] Image 6 It is a perspective view showing the outline of a prefilter 23A used in the urea SCR system according to the second embodiment. The difference between the first embodiment and the second embodiment lies in whether to use the coarse filter 23 or the coarse filter 23A, so only the coarse filter 23A will be described below, and the description of other structures in the urea SCR system will be omitted.

[0059] The strainer 23A mainly includes: a roughly cylindrical strainer body 23a; and a front end portion 23c provided on the strainer body 23a.

[0060] The front-end part 23c is integrally formed with the front-end cylinder 232 so that it may protrude to the side opposite to t...

no. 3 approach

[0064] In the first embodiment, the shape of the tip portion 23b formed of a material impermeable to urea water when cut along a plane including the central axis A of the prefilter 23 is approximately triangular, but the shape of the tip portion is not limited thereto.

[0065] Figure 7 It is a perspective view showing the outline of a strainer 23B used in the urea SCR system according to the third embodiment. The difference between the first embodiment and the third embodiment lies in whether to use the strainer 23 or the strainer 23B, so only the strainer 23B will be described below, and the description of other structures in the urea SCR system will be omitted.

[0066] The strainer 23B mainly includes: a roughly cylindrical strainer body 23a; and a front end portion 23d provided on the strainer body 23a.

[0067] The front-end part 23d is integrally formed with the front-end cylinder 232 so that it may protrude to the side opposite to the prefilter main body 23a.

[006...

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Abstract

It can prevent backspray of urea water. A strainer is provided inside an injection pipe which serves as an injection port for injecting a liquid containing a reducing agent into the tank main body. The strainer has a front end portion integrally formed at the front end of a roughly cylindrical strainer body, and the shape of the front end portion when cut along a plane including the shaft of the strainer body is roughly triangular or trapezoidal.

Description

technical field [0001] This invention relates to strainers. Background technique [0002] Patent Document 1 discloses an SCR system in which urea water in a urea water tank is sucked into a urea water pump disposed in the urea water tank through a strainer and a filter. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2009-183012 [0006] The problem to be solved by the invention [0007] A selective reduction (SCR: Selective Catalytic Reduction) type urea SCR system for reducing NOx (nitrogen oxides) in exhaust gas is used in internal combustion engines (especially diesel engines) applied to automobiles and the like. In this urea SCR system, an SCR catalyst that reacts nitrogen oxides (NOx) with a reducing agent is installed in the middle of the exhaust pipe through which exhaust gas flows, so that NOx in the exhaust gas is selectively adsorbed on the SCR catalyst and sent to the SCR catalyst. Urea water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D35/02B01D29/01B01D53/94F01N3/08
CPCB01D35/02B01D29/117B01D29/902B01D2201/02B01D53/90B01D2251/2067B01D53/9418F01N3/2066F01N2610/02F01N2610/1426Y02T10/12B01D29/11
Inventor 丹下誉积中冈英雄若林正法
Owner YAMASHIN FILTER CORP