JP2009500600A5

JP2009500600A5 -

Info

Publication number: JP2009500600A5
Application number: JP2008518937A
Authority: JP
Filing date: 2006-06-27
Publication date: 2009-07-16

Claims

A non-destructive method for detecting an internal defect of a filter , the filter comprising one or more honeycomb filter elements, the series or elements having a series of parallel axes separated by porous walls comprises adjacent ducts or channels, said duct gas is to pass through the porous walls, by being sealed by a plug at one or the other of their ends, open through the gas inlet side through the inlet chamber and a gas take-out side are separated and an outlet chamber which is open, the presence or absence of該欠point is evaluated by measuring the propagation of one or more of the filter elements passing Ruga scan flow A method characterized by that.

The disadvantages are of the following types: damage in joints in walls or between elements in honeycomb elements, incomplete sealing of ducts, cracks in walls or in joints, defects, porous plugs or additional plugs, walls or joints The method according to claim 1, wherein the thickness distribution of the parts is uneven and the coating cement is poorly sealed.

Presence or absence of該欠points are evaluated by comparison with a control value corresponding to a filter not having any internal defect, a method according to claim 1 or 2.

Propagation of gas flow through the filter is evaluated by the analyzing the transmission spectrum of infrared with a filter outlet, the method according to any one of claims 1 to 3.

Propagation of gas flow through the filter is evaluated by at least one measurement of the gas velocity at the exit of the filter, The method according to claim 1.

The method of claim 5, wherein a series of measurements of gas velocity are made to obtain a profile of the velocity at the filter outlet.

7. A method according to claim 6, wherein the presence or absence of the drawback is assessed by comparison between various gas velocity values obtained on the filter.

The method according to claim 6 or 7 , wherein the measured pitch is equal to or less than the width of the duct.

9. A method according to any preceding claim , wherein the porous wall of the filter is pre-filled with a smoke concentration of 1 gram per liter or more.

An apparatus for carrying out the method according to any one of 請 Motomeko 1-9,
- means for sending the gas into the filter (6),
-Means (8, 9, 10) for limiting the air flow introduced into the filter (4);
-Means (3, 5) for controlling the flow rate and / or pressure of the air introduced into the filter;
- it means in the filter outlet for measuring the propagation of one or more of the filter elements passing Ruga scan stream,
Including the device.

Measuring means, propeller anemometer, hot wire, pitot tube, Nekkyu device, thermal film device, PIV (particle image Velocimetry) type device, LDA (laser Doppler velocimeter) for measuring the Doppler effect associated with the airflow velocity type 11. The device according to claim 10, which is a means for measuring a gas velocity (15) selected from the device.

12. The device according to claim 11, wherein the control means comprises a butterfly valve (3) with a precision valve (5).

Measuring means, a device for evaluating the propagation of the gas stream by analyzing the transmission spectrum of infrared in the filter outlet device according to claim 10.

A use of the method or apparatus according to any one of 請 Motomeko 1-13,
-To control the particle filter manufacturing method,
-To control the particle filter recycling method,
-For consideration for the design, characterization or development of new particle filters ;
-For studying filter durability control
Uses.