CN105334305B - Porous member - Google Patents
Porous member Download PDFInfo
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- CN105334305B CN105334305B CN201410333062.4A CN201410333062A CN105334305B CN 105334305 B CN105334305 B CN 105334305B CN 201410333062 A CN201410333062 A CN 201410333062A CN 105334305 B CN105334305 B CN 105334305B
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- porous member
- peripheral portion
- central portion
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Abstract
The present invention relates to porous members, and more particularly to porous members for forming louvers of explosion-proof housings. According to one embodiment of the present invention, a porous member made of a porous material includes a peripheral portion and a central portion surrounded by the peripheral portion, wherein the peripheral portion of the porous member is reduced in thickness by being pressed so that the peripheral portion of the porous member is more dense than the central portion of the porous member. The invention also relates to methods for manufacturing the porous member and methods for sealingly bonding the porous member to the explosion-proof housing.
Description
Technical Field
The present invention relates to porous members, and more particularly to porous members for forming louvers of explosion-proof housings. The invention also relates to methods for manufacturing the porous member and methods for sealingly bonding the porous member to the explosion-proof housing.
Background
Devices used in explosive gas environments require explosion-proof designs. For example, for a combustible gas sensor, it is typically placed in an explosion proof housing. The explosion-proof housing has a vent to allow gas to pass through the vent into the explosion-proof housing so that the combustible gas sensor can detect the gas. The louver is typically formed from a porous material. In the prior art, the louvers are formed by sintering porous sintered blocks onto the opening of the explosion proof housing. However, such a sintering manner makes it difficult to reduce the height of the device, which is disadvantageous for achieving miniaturization of the device. To solve the problem of miniaturization of the device, chinese patent application CN201210367286.8 proposes to replace the porous sintered cake with a thin wire mesh which is welded to the opening of the explosion-proof housing by a welding process. However, the fusion welding technique has a disadvantage in that it cannot be guaranteed that the explosion-proof housing meets the explosion-proof standards. For explosion proof housings that use fusion welding techniques to weld the wire mesh, 100% sampling tests must be performed before delivery for use, which greatly extends product delivery time and increases costs.
To overcome the disadvantages of fusion welding, a brazing process is used to sealingly bond the wire mesh to the explosion proof housing. However, one disadvantage of the conventional brazing process for wire mesh welding is that the joint area presents gaps that are uncontrollable in size and location, such that gases and flames may pass through the gaps, causing an explosive accident. Another disadvantage of conventional brazing processes is that the brazing material tends to flow into the central gas permeable portion of the wire mesh due to capillary action of the wire mesh, causing undesirable clogging.
Disclosure of Invention
The present invention is directed to overcoming one or more of the disadvantages of the prior art, which is achieved by the following technical solutions.
In one aspect of the present invention, there is provided a porous member made of a porous material, the porous member including a peripheral portion and a central portion surrounded by the peripheral portion, wherein the peripheral portion of the porous member is reduced in thickness by being pressed so that the peripheral portion of the porous member is more dense than the central portion of the porous member.
In one embodiment, the porous member is a rectangular or circular or oval sheet-like member.
In one embodiment, the porous material is a wire mesh.
In one embodiment, the central portion protrudes beyond the peripheral portion on the top surface of the porous member, and the central portion is flush with the peripheral portion on the bottom surface of the porous member.
In one embodiment, the central portion protrudes beyond the peripheral portion on both the top and bottom surfaces of the porous member.
In one embodiment, the air permeability of the central portion of the porous member is 40% -90%, and the air permeability of the peripheral portion of the porous member is 0-30%.
In another aspect of the present invention, there is provided a method for manufacturing a porous member, the method comprising: providing a blank made of a porous material, the blank comprising a peripheral portion and a central portion surrounded by the peripheral portion; and pressing a peripheral portion of the blank to obtain the porous member such that the peripheral portion is denser than the central portion of the obtained porous member.
In another aspect of the invention, a method for sealingly bonding a porous member to an explosion-proof housing is provided, the method comprising: providing a blank made of a porous material, the blank comprising a peripheral portion and a central portion surrounded by the peripheral portion; pressing a peripheral portion of the blank to obtain the porous member such that the peripheral portion of the obtained porous member is denser than the central portion; providing an explosion proof housing having an opening; applying a brazing material around the opening; covering the opening with the porous member such that a peripheral portion of the porous member is in contact with the brazing material and such that a central portion of the porous member is not in contact with the brazing material; and performing a brazing process such that the porous member is hermetically bonded to the explosion-proof case.
In one embodiment, the weight percentage of boron in the braze material is less than or equal to 3%.
In one embodiment, the solid content of the brazing material is 60-96% by weight, more preferably 82-96% by weight.
Drawings
A more complete understanding of the present invention and other advantages thereof may be acquired by referring to the following detailed description and claims when considered in conjunction with the accompanying drawings. Like reference symbols in the various drawings indicate like elements. In the drawings:
FIG. 1 schematically illustrates one embodiment of a porous member according to the present invention;
FIG. 2 schematically illustrates another embodiment of a porous member according to the present invention;
FIG. 3 schematically illustrates a flow diagram of a method for manufacturing a porous member according to the present invention;
FIG. 4 schematically illustrates a flow chart of a method for sealingly bonding a porous member to an explosion-proof housing in accordance with the present invention;
FIG. 5 shows a schematic view of an explosion proof enclosure according to one embodiment of the invention;
FIG. 6 schematically illustrates a view of the porous member after assembly with the explosion proof housing; and is
Fig. 7 schematically illustrates a brazing material applied around the opening of the explosion proof housing.
Detailed Description
In one aspect of the invention, a porous member made of a porous material is provided. Fig. 1 and 2 show schematic views of a porous member according to the present invention.
Fig. 1 schematically shows an embodiment of a porous member according to the present invention. In the embodiment shown in fig. 1, the porous member 100 is an approximately rectangular sheet-like member whose four corners are rounded. One skilled in the art will recognize that the porous member 100 may also have any other suitable shape, such as circular, elliptical, polygonal, etc., as desired. Since the porous member 100 is made of a porous material, the porous member 100 is air-permeable. Typically, the porous material used to form porous member 100 has an air permeability of 40% -90%, e.g., 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%. One skilled in the art will recognize that the porous material used to form porous member 100 may also have any other suitable air permeability as desired. In one embodiment, the porous material used to make porous member 100 may be a wire mesh. One skilled in the art will recognize that any other suitable porous material may also be used to fabricate the porous member 100.
The porous member 100 may be formed by extrusion from a blank 101 of porous material. The blank 101 includes a peripheral portion 102 and a central portion 104 surrounded by the peripheral portion 102. The blank 101 has an initial thickness T1. The peripheral portion 102 of the blank 101 is pressed so that the thickness is from T1Is reduced to T2While the thickness of the central portion 104 of the blank 101 remains T1. The extruded porous member 100 includes a thickness T2And a peripheral portion 102 and a thickness T1The central portion 104. As shown in FIG. 1, the thickness T of the peripheral portion 102 of the porous member 100 can be seen2Less than the thickness T of the central portion 104 of the porous member 1001. As shown in fig. 1, the central portion 104 of the porous member 100 protrudes from the peripheral portion 102 on the top surface of the porous member 100, and the central portion 104 of the porous member 100 is flush with the peripheral portion 102 on the bottom surface of the porous member 100. Since the peripheral portion 102 of the blank 101 of the porous member 100 is pressed thickThe degree is reduced such that the resulting peripheral portion 102 of the porous member 100 is more dense than the central portion 104. Since the peripheral portion 102 of the porous member 100 is denser than the central portion 104 of the porous member 100, the air permeability of the peripheral portion 102 of the porous member 100 is less than the air permeability of the central portion 104 of the porous member 100. The denser the peripheral portion 102 of the porous member 100 is pressed, the smaller the air permeability of the peripheral portion 102 of the porous member 100. In one embodiment, the central portion 104 of the porous member 100 has an air permeability of 40-90% and the peripheral portion 102 of the porous member 100 has an air permeability of 0-30%. In one embodiment, the central portion 104 of the porous member 100 has an air permeability of 50% and the peripheral portion 102 of the porous member 100 has an air permeability of 5%. One skilled in the art will recognize that the peripheral portion 102 of the porous member 100 may be compressed to any suitable degree of compaction as desired.
It may be advantageous to compress the peripheral portion 102 of the blank 101 of the porous member 100, which may result in a more compact peripheral portion 102 of the porous member 100, thereby significantly inhibiting capillary action at the peripheral portion 102 of the porous member 100. When the brazing material is applied to the peripheral portion 102 of the porous member 100, the flow of the brazing material to the central portion 104 due to capillary action is significantly inhibited.
The pressing operation of the peripheral portion 102 of the blank 101 of the porous member 100 may be performed in any suitable manner as long as the resulting peripheral portion 102 of the porous member 100 is more dense than the central portion 104.
Fig. 2 schematically shows another embodiment of a porous member according to the present invention. In the embodiment shown in fig. 2, porous member 200 has a shape similar to porous member 100 of fig. 1, and blank 201 for forming porous member 200 is also similar to blank 101 for forming porous member 100. Except that the central portion 204 of the extruded porous member 200 protrudes from the peripheral portion 202 on both the top and bottom surfaces of the porous member 200, while the central portion 104 of the extruded porous member 100 protrudes from the peripheral portion 102 only on the top surface of the porous member 100.
In another aspect of the invention, a method for manufacturing a porous member is provided. Fig. 3 schematically shows a flow chart of a method 300 for manufacturing a porous member according to the present invention.
As shown in fig. 3, at step 302, a blank 101, 201 made of a porous material is provided, the blank 101, 201 comprising a peripheral portion 102, 202 and a central portion 104, 204 surrounded by the peripheral portion 102, 202. At step 304, the peripheral portion 102, 202 of the blank 101, 201 of the porous member 100, 200 is pressed to obtain the porous member 100, 200 such that the peripheral portion 102, 202 of the resulting porous member 100, 200 is more dense than the central portion 104, 204.
In another aspect of the invention, a method for sealingly bonding a porous member to an explosion-proof housing is provided. FIG. 4 schematically illustrates a flow chart of a method 400 for sealingly bonding a porous member to an explosion-proof housing in accordance with the present invention.
As shown in fig. 4, at step 402, a blank 101, 201 made of a porous material is provided, the blank 101, 201 comprising a peripheral portion 102, 202 and a central portion 104, 204 surrounded by the peripheral portion 102, 202. At step 404, the peripheral portion 102, 202 of the blank 101, 201 of the porous member 100, 200 is pressed to obtain the porous member 100, 200 such that the peripheral portion 102, 202 of the resulting porous member 100, 200 is more dense than the central portion 104, 204. At step 406, an explosion proof housing 500 having an opening 502 is provided. At step 408, a brazing material 504 is applied around the opening 502. At step 410, the porous member 100, 200 is covered over the opening 502 such that the peripheral portion 102, 202 of the porous member 100, 200 is in contact with the brazing material and such that the central portion 104, 204 of the porous member 100, 200 is not in contact with the brazing material. At step 412, a brazing process is performed such that the porous members 100, 200 are sealingly bonded to the explosion proof housing 500.
Figure 5 shows a schematic view of an explosion proof enclosure 500 according to one embodiment of the invention. The explosion proof housing 500 has an opening 502.
Fig. 6 schematically shows a view after the porous members 100, 200 are assembled with the explosion-proof case 500. The porous members 100, 200 are sealingly bonded to the explosion proof housing 500 and cover the opening 502 to form the vent window.
FIG. 7 schematically illustrates a brazing material 504 applied around the opening 502 of the explosion proof housing 500. As shown in fig. 7, a brazing material 504 is applied to the explosion proof housing 500 in the area to be in contact with the peripheral portions 102, 202 of the porous members 100, 200.
In order to further reduce the fluidity of the brazing material, and to better avoid the brazing material from flowing to the central portion of the porous member, the percentage by weight of boron in the brazing material is preferably 3% or less.
In order to further reduce the fluidity of the brazing material and to better avoid the brazing material from flowing to the central portion of the porous member, the solid content in the brazing material is preferably 60% to 96% by weight, more preferably 82% to 96% by weight.
While the present invention has been described with reference to exemplary embodiment(s), it will be understood by those skilled in the art that the invention is not limited to the precise construction and components disclosed herein and that various modifications, changes, and variations may be apparent from the foregoing descriptions without departing from the spirit and scope of the invention as defined in the appended claims. The present invention is not limited by the illustrated ordering of steps, as some steps may occur in different orders and/or concurrently with other steps. Therefore, it is intended that the invention not be limited to the particular embodiment(s) disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (11)
1. A porous member made of a porous material, comprising:
a peripheral portion; and
a central portion having a perimeter, wherein the perimeter of the central portion is surrounded by the perimeter portion,
wherein a peripheral portion of the porous member is reduced in thickness by being pressed so that the peripheral portion of the porous member is denser than a central portion of the porous member,
wherein the central portion protrudes from the peripheral portion on the top surface of the porous member.
2. The porous member of claim 1, wherein the porous member is a rectangular or circular or oval sheet-like member.
3. The porous member of claim 1, wherein the porous material is a wire mesh.
4. The porous member of claim 1, wherein the central portion is flush with the peripheral portion on a bottom surface of the porous member.
5. The porous member of claim 1 wherein said central portion protrudes above said peripheral portion on both said top and bottom surfaces of said porous member.
6. The porous member of claim 1, wherein the air permeability of the central portion of the porous member is 40% -90% and the air permeability of the peripheral portion of the porous member is 0-30%.
7. A method for manufacturing a porous member, comprising:
providing a blank made of a porous material, the blank comprising a peripheral portion and a central portion, the central portion having a periphery, wherein the periphery of the central portion is surrounded by the peripheral portion; and
the porous member is obtained by pressing a peripheral portion of the blank so that the peripheral portion of the obtained porous member is denser than a central portion that protrudes from the peripheral portion on the top surface of the porous member.
8. A method for sealingly bonding a porous member to an explosion-proof housing, comprising:
providing a blank made of a porous material, the blank comprising a peripheral portion and a central portion, the central portion having a periphery, wherein the periphery of the central portion is surrounded by the peripheral portion;
pressing a peripheral portion of the blank to obtain the porous member such that the peripheral portion of the obtained porous member is denser than a central portion protruding from the peripheral portion on a top surface of the porous member;
providing an explosion proof housing having an opening;
applying a brazing material around the opening;
covering the opening with the porous member such that a peripheral portion of the porous member is in contact with the brazing material and such that a central portion of the porous member is not in contact with the brazing material; and
performing a brazing process such that the porous member is hermetically bonded to the explosion-proof housing.
9. The method of claim 8, wherein the weight percentage of boron in the braze material is less than or equal to 3%.
10. The method of claim 8, wherein the solid content of the brazing material is 60% to 96% by weight.
11. The method of claim 8, wherein the solid content of the brazing material is 82% to 96% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333062.4A CN105334305B (en) | 2014-07-14 | 2014-07-14 | Porous member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410333062.4A CN105334305B (en) | 2014-07-14 | 2014-07-14 | Porous member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105334305A CN105334305A (en) | 2016-02-17 |
| CN105334305B true CN105334305B (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410333062.4A Active CN105334305B (en) | 2014-07-14 | 2014-07-14 | Porous member |
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Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1006452A3 (en) * | 1992-12-18 | 1994-08-30 | Bekaert Sa Nv | Porous sintered laminate comprising metal fibers. |
| FR2782278B1 (en) * | 1998-08-17 | 2000-09-15 | Commissariat Energie Atomique | CATALYSIS HYDROGEN RECOMBINATOR ANTI-DEFLAGRATION DEVICE |
| CN1209345A (en) * | 1998-09-02 | 1999-03-03 | 冶金工业部钢铁研究总院 | Mirco-aperture fire-retardant anti-explosion component made of sintered metal wire-mesh screen |
| US6551421B1 (en) * | 2000-11-20 | 2003-04-22 | Honeywell International Inc. | Brazing foil performs and their use in the manufacture of heat exchangers |
| JP2003207108A (en) * | 2002-01-18 | 2003-07-25 | Kaneko Sangyo Kk | Wire mesh flame arrestor |
| DE10326150B4 (en) * | 2003-06-06 | 2005-12-15 | Leinemann Gmbh & Co. Kg | Durable fire barrier |
| JP2008012856A (en) * | 2006-07-07 | 2008-01-24 | Sumitomo Wiring Syst Ltd | Insert molded article with porous member and method for manufacturing insert molded article with porous member |
| CN101157567B (en) * | 2007-09-11 | 2010-06-02 | 江苏科技大学 | Boron-containing titanium-based amorphous solder for braze welding Si3N4 ceramic and preparation method thereof |
| CN101413071A (en) * | 2008-12-05 | 2009-04-22 | 西北有色金属研究院 | Metal polyporous material with gradient pore structure and preparation thereof |
| US8485040B2 (en) * | 2011-03-14 | 2013-07-16 | Rosemount Inc. | Flame arrestor for process transmitter |
| CN203280947U (en) * | 2013-06-17 | 2013-11-13 | 安徽理工大学 | Double-core-plate pipeline fire barrier |
| DE102013109260A1 (en) * | 2013-08-27 | 2015-03-05 | R.Stahl Schaltgeräte GmbH | Housing part for an explosion-proof housing with a porous body |
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2014
- 2014-07-14 CN CN201410333062.4A patent/CN105334305B/en active Active
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| CN105334305A (en) | 2016-02-17 |
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