U.S. patent application number 11/480456 was filed with the patent office on 2007-02-15 for metal net for treatment of gases.
Invention is credited to Juha Laiho, Pekka Matilainen, John Michelon.
Application Number | 20070033923 11/480456 |
Document ID | / |
Family ID | 34803147 |
Filed Date | 2007-02-15 |
United States Patent
Application |
20070033923 |
Kind Code |
A1 |
Laiho; Juha ; et
al. |
February 15, 2007 |
Metal net for treatment of gases
Abstract
The invention relates to a metal net for use in gas treatment
and an gas treatment equipment including this metal net and a
method for cleaning exhaust gases of engines. The invention also
relates to equipment for manufacturing such a metal net. The
equipment according to the invention is particularly suitable as a
catalyzer for small engines. A metal net comprises frame components
fastened to each other at least at some points with weld joints
made with a pulsation arc technique
Inventors: |
Laiho; Juha; (Kuusa, FI)
; Michelon; John; (Crete, IL) ; Matilainen;
Pekka; (Jyvaskyla, FI) |
Correspondence
Address: |
YOUNG & THOMPSON
745 SOUTH 23RD STREET
2ND FLOOR
ARLINGTON
VA
22202
US
|
Family ID: |
34803147 |
Appl. No.: |
11/480456 |
Filed: |
July 5, 2006 |
Current U.S.
Class: |
60/275 |
Current CPC
Class: |
F01N 2330/12 20130101;
Y02T 10/20 20130101; F01N 3/0226 20130101; B01D 2258/01 20130101;
B01D 39/12 20130101; Y02T 10/22 20130101; B01D 53/9454 20130101;
B01J 37/0225 20130101; B01J 35/04 20130101; Y02T 10/12
20130101 |
Class at
Publication: |
060/275 |
International
Class: |
F01N 3/00 20060101
F01N003/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 5, 2005 |
FI |
U20050234 |
Claims
1. A metal net for use in gas treatment, wherein frame components
of the metal net are fastened to each other at least at some points
with weld joints made with a pulsation arc technique.
2. A metal net according to claim 1, wherein the thickness of the
frame component is 0.15 mm or more.
3. A metal net according to claim 1, wherein the material of the
frame component is stainless steel, such as W1.4767, W1.4725 or
W1.4301.
4. A metal net according to claim 1, wherein the metal net is
essentially covered with catalyzing materials.
5. Equipment for manufacturing a metal net frame for use in gas
treatment, wherein the equipment of the treatment cell comprises
means for fastening the metal net (1) and a pulsation arc welding
machine for connecting the metal wire frame components to each
other with pulsation arc weld joints (3).
6. Gas treatment equipment, comprising one or more metal nets (1)
having frame components of the metal net fastened to each other at
least at some points with weld joints made with a pulsation arc
technique.
7. A method for cleaning exhaust gas of engines, wherein exhaust
gas is cleaned with a metal net having frame components fastened to
each other at least at some points with weld joints made with a
pulsation arc technique.
8. A method according to claim 7, wherein said engine is a small
engine.
Description
TECHNICAL BACKGROUND
[0001] The invention relates to a metal net for use in gas
treatment and a treatment equipment including this metal net and a
method for cleaning exhaust gases of engines. The invention also
relates to equipment for manufacturing such a metal net. The
equipment according to the invention is particularly suitable as a
catalyzer for small engines.
[0002] Several types of frame constructions are used in the
treatment of exhaust gases. One commonly used frame solution is a
net-like construction, which includes metal wires. However, the
problem with this type of net-like frame is its poor mechanical
resistance particularly in demanding burning conditions.
GENERAL DESCRIPTION OF INVENTION
[0003] A treatment cell for exhaust gases has now been invented,
which is particularly resistant even in demanding conditions.
[0004] To achieve this object, the invention is characterized by
the features specified in the independent claims. Some of the
advantageous embodiments of the invention are set forth in the
other claims.
[0005] In the treatment cell for exhaust gases according to the
invention, frame components of the metal net are fastened to each
other at least at some points with weld joints produced with a
pulsation arc technique. This pulsation arc weld joint essentially
strengthens the net-like frame. Advantageously the metal net has
pulsation arc weld joints essentially at all connection points of
the frame components. To mention as a reference value, without
pulsation arc weld joints the resistance of the net-like treatment
cell was only about 50 h in the reference test, whereas the
resistance of the cell including weld joints made with the
pulsation arc technique was 125 h.
[0006] The metal net according to the invention is extremely
resistant, because the joints prevent the frame components from
vibrating relative to each other and individually. This is
particularly advantageous for example when the frame components are
covered with a support material. Fastening of the frame components
advances, for example, secure attachment of the support material
layers, which can sometimes be quite thick, connected to the
intersections. This improves the resistance of the coated frame
material.
[0007] According to one embodiment of the invention, the thickness
of the metal net frame component is 0.15 mm or more, such as
advantageously 0.3-0.6 mm. In principle, a treatment cell according
to the invention can also be manufactured from frame components
having a very high thickness. The frame component can
advantageously be less than 2.0 mm. In this case it is sufficiently
thin to allow forming the metal net advantageously to the desired
shape. The treatment cell can be made mechanically extremely
resistant, which further improves its usability.
[0008] According to one embodiment of the invention, the material
of the frame components of the metal net is advantageously
stainless steel, such as W1.4767, W1.4725 or W1.4301. This material
is resistant, which allows making the product maximally resistant
even for demanding conditions.
[0009] The size of the metal net according to the invention can
vary freely. The thickness of the metal net can be e.g. 1-50 mm,
such as advantageously 5-15 mm. In relation to the volume, it is
then maximally resistant for the construction, and also technically
advantageous to manufacture.
[0010] According to one embodiment of the invention, the treatment
cell is essentially covered with catalyzing materials. This type of
cell can be efficiently used particularly as a catalyzer for small
engines. Such small engines include e.g. chain saws, grass
trimmers, mopeds, scooters, motorcycles, outboard motors and
aggregates.
[0011] A treatment cell according to the invention can also be used
for exhaustion of smoke and volatile gases. Applications can also
include hoods and filters, for example.
DETAILED DESCRIPTION OF INVENTION
[0012] Some of the embodiments of the invention are described below
in detail by making reference to the enclosed drawing.
[0013] FIG. 1 is a cross-sectional view of a treatment cell for
exhaust gases welded with a pulsation arc welding technique.
[0014] In FIG. 1 the frame components 2 of the metal net of the
treatment cell 1 for exhaust gases are fastened to each other with
pulsation arc weld joints 3. The metal net 1 forms a resistant
construction, as the frame components 2 are connected in all
directions to each other with weld joints 3.
* * * * *