Slurry Injection Apparatus for Diesel Particulate Filter Uniformity

Solution Overview

Problem

Existing slurry injection apparatuses fail to suppress the generation of remained slurry in injection holes and cannot form the surface of injected slurry in various shapes with high accuracy, leading to deteriorated physical properties and pressure loss differences in diesel particulate filters.

Innovation Solution

An apparatus with a second member featuring convex sections of varying diameters and lengths, and a specified spacing between them, which injects slurry at a controlled distance from a flat plane, reducing remained slurry and enabling precise shaping of the slurry surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a wheel is used to form the slurry surface in a planar state, then the slurry surface can be formed, but differences in surface height appear depending on worker skill

Engineering Contradiction:

Improveslurry surface height uniformityVSAvoiddependence on worker skill

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent replaces the mechanical wheel-based slurry surface forming method with a slurry injection apparatus that uses injection holes to deposit slurry directly at controlled depths. This substitution eliminates the need for manual wheel operation and achieves uniform slurry surface height through controlled injection parameters rather than mechanical contact.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental parameter of slurry application from surface-level wheel manipulation to subsurface injection at controlled depths. By injecting slurry at a depth of 5-10mm below the DPF surface and controlling injection pressure and flow rate, the system achieves uniform surface height without depending on worker skill or mechanical wheel contact.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the apparatus for injecting slurry is used, then slurry can be injected, but remained slurry is generated in ejection holes

Engineering Contradiction:

Improveslurry injection capabilityVSAvoidslurry physical properties

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by injecting slurry to a controlled depth of 5-10mm below the surface before firing. This pre-injection at subsurface level ensures complete slurry deposition and prevents remained slurry from forming in the injection holes after the process, thereby maintaining slurry physical properties and eliminating the need for cleanup operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies local quality by varying injection parameters (depth, pressure, flow rate) according to the specific requirements of different DPF regions. The injection holes are positioned and configured to deliver slurry at optimal local conditions, ensuring complete filling without remained slurry while accommodating variations in DPF structure and slurry introduction requirements.

Inventive Principle:

Principle #3Local quality

3Reliability

If slurry is injected to plug DPF cells, then particulate matter collection is improved, but pressure loss differences occur between central and outer peripheral parts

Engineering Contradiction:

Improveparticulate matter collection efficiencyVSAvoidslurry depth uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by varying injection parameters (depth, pressure, flow rate) according to the specific requirements of different DPF regions. The injection holes are positioned and configured to deliver slurry at optimal local conditions, ensuring complete filling without remained slurry while accommodating variations in DPF structure and slurry introduction requirements.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the fundamental parameter of slurry application from surface-level wheel manipulation to subsurface injection at controlled depths. By injecting slurry at a depth of 5-10mm below the DPF surface and controlling injection pressure and flow rate, the system achieves uniform surface height without depending on worker skill or mechanical wheel contact.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2181821B1Apparatus for injecting slurry and method therefor

Publication Date: 2015.04.15 NGK INSULATORS LTD

Figure 1
Figure 2~3
Figure 4A~4B

AI summary

The apparatus (1) for injecting slurry contains the first member (2) having the cavity (4) therein; and the second member (3) having a plurality of convex sections (6), each of the convex sections having the injection hole (5) formed therein communicating with the cavity (4), wherein the protrusion length of the convex section is in a range from 3 to 5 mm, and the distance between centers of adjacent convex sections is in a range from 3 to 13 mm.