Inspection device and inspection method for pillar-shaped honeycomb filter

Patent metadata

Field	Value
Publication number	US-12117386-B2
Application number	US-202217650400-A
Country	US
Kind code	B2
Filing date	Feb 9, 2022
Priority date	Jun 18, 2021
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

An inspection device for a pillar shaped honeycomb filter includes: a housing portion that can house a pillar shaped honeycomb filter; an introduction pipe and a discharge pipe through which a gas can flow, each of the introduction pipe and the discharge pipe being connected to the housing portion; a particle generation portion for generating particles; a particle introduction portion for introducing the particles generated by the particle generation portion into the introduction pipe; a gas stirring portion arranged in the introduction pipe on an upstream side of the particle introduction portion in a gas flow direction; and particle counters for measuring the number of particles, the particle counters being arranged in the introduction pipe and the discharge pipe on a downstream side of the particle introduction portion in the gas flow direction.

First claim

The invention claimed is:

1. An inspection device for a pillar shaped honeycomb filter, wherein the inspection device comprises:
a housing portion that can house a pillar shaped honeycomb filter;
an introduction pipe and a discharge pipe through which a gas can flow, each of the introduction pipe and the discharge pipe being connected to the housing portion;
a particle generation portion for generating particles;
a particle introduction portion for introducing the particles generated by the particle generation portion into the introduction pipe;
a gas stirring portion arranged in the introduction pipe on an upstream side of the particle introduction portion in a gas flow direction; and
particle counters for measuring the number of particles, the particle counters being arranged in the introduction pipe and the discharge pipe on a downstream side of the particle introduction portion in the gas flow direction,
wherein the gas stirring portion is a gas stirring plate having a pair of planes perpendicular to the gas flow direction and having a plurality of openings penetrating the pair of planes, and the plurality of openings are provided in a region on an outer peripheral side of the gas stirring plate.

2. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein the plurality of openings have an opening ratio of from 5 to 50%.

3. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein a direction of the particles introduced in the particle introduction portion has an angle of more than 90° relative to the gas flow direction.

4. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein the particles have an average particle diameter of from 100 to 1000 nm.

5. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein a flow rate of the gas is from 500 to 10000 L/min.

6. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein the particle counters can measure the number of the particles having a particle diameter of 100 nm or more.

7. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein each of the particle counters is an optical particle counter.

8. The inspection device for a pillar shaped honeycomb filter according to claim 1 , further comprising a diluter for adjusting the concentration of the particles, provided between the particle generation portion and the particle introduction portion.

9. The inspection device for a pillar shaped honeycomb filter according to claim 8 , wherein the diluter dilutes the concentration of the particles generated in the particle generation portion by 2 to 1000 times.

10. The inspection device for a pillar shaped honeycomb filter according to claim 1 , further comprising a calculation unit for calculating a collection efficiency of the particles based on the number of the particles measured by the particle counters arranged in the introduction pipe and the discharge pipe.

11. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein a distance between the particle introduction portion and the gas stirring portion in the gas flow direction is 3 times or less an inner diameter of the introduction pipe at the position where the gas stirring portion is arranged.

12. The inspection device for a pillar shaped honeycomb filter according to claim 1 , wherein a distance between the particle introduction portion and the particle counter arranged in the introduction pipe in the gas flow direction is at least twice an inner diameter of the introduction pipe at the position where the particle counter is arranged.

13. An inspecting method for a pillar shaped honeycomb filter, wherein the method comprises:
a particle generation step of generating particles;
a particle introduction step of introducing the particles generated in the particle generation step into a gas stirred by a gas stirring portion;
a particle feed step of feeding the gas having the introduced particles to the pillar shaped honeycomb filter; and
a particle measurement step of measuring the number of particles in the gas on an upstream side and a downstream side of the pillar shaped honeycomb filter in a flow direction of the gas,
wherein the gas stirring portion is a gas stirring plate having a pair of planes perpendicular to the gas flow direction and having a plurality of openings penetrating the pair of planes, and wherein the plurality of openings are provided in a region on an outer peripheral side of the gas stirring plate.

14. The inspection method for a pillar shaped honeycomb filter according to claim 13 , wherein the plurality of openings have an opening ratio of from 5 to 50%.

15. The inspection method for a pillar shaped honeycomb filter according to claim 13 , wherein a direction of the particles introduced in the particle introduction step has an angle of more than 90° relative to the gas flow direction.

16. The inspection method for a pillar shaped honeycomb filter according to claim 13 , wherein the particles have an average particle diameter of from 100 to 1000 nm.

17. The inspection method for a pillar shaped honeycomb filter according to claim 13 , wherein a flow rate of the gas is from 500 to 10000 L/min.

18. The inspection method for a pillar shaped honeycomb filter according to claim 13 , wherein the particle measurement step comprises measuring the number of the particles having a particle diameter of 100 nm or more.

19. The inspection method for a pillar shaped honeycomb filter according to claim 13 , wherein the number of the particles is measured using optical particle counters.

20. The inspection method for a pillar shaped honeycomb filter according to claim 13 , further comprising a particle concentration diluting step of diluting the concentration of the particles generated in the particle generation step.

21. The inspection method for a pillar shaped honeycomb filter according to claim 20 , wherein the particle concentration diluting step comprises diluting the concentration of the particles generated in the particle generation step by 2 to 1000 times.

22. The inspection method for a pillar shaped honeycomb filter according to claim 13 , further comprising a collection efficiency calculation step of calculating a collection efficiency of the particles from the number of the particles obtained in the particle measurement step.

Assignees

• Ngk Insulators Ltd

Inventors

• Kajiura Yohei
• Watanabe Yuji
• Sato Yoshihiro
• Tajima Yuichi

Classifications

• G01N33/0004

  Gaseous mixtures, e.g. polluted air · CPC title

• G01N2015/0662

  Comparing before/after passage through filter · CPC title

• G01N2015/084

  Testing filters · CPC title

• G01N2015/1486

  Counting the particles · CPC title

• B01D39/2079

  otherwise bonded, e.g. by resins · CPC title