CN108788358B - Brazing filter element and welding process - Google Patents
Brazing filter element and welding process Download PDFInfo
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- CN108788358B CN108788358B CN201810983752.2A CN201810983752A CN108788358B CN 108788358 B CN108788358 B CN 108788358B CN 201810983752 A CN201810983752 A CN 201810983752A CN 108788358 B CN108788358 B CN 108788358B
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- brazing
- filter element
- filter
- filter cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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Abstract
The invention provides a brazing filter element and a welding process, wherein the brazing filter element comprises a bottom cover, an end cover and a stainless steel mesh corrugated filter cylinder, the bottom cover and the end cover are respectively arranged at two ends of the filter cylinder in a sealing mode, the filter cylinder, the bottom cover and the end cover are connected through brazing flux, and inhibitors are coated on the end portions of the two ends of the filter cylinder along the circumference of the filter cylinder. Fix the stainless steel net between end cover and bottom through the mode of brazing, stable in structure and intensity are high, are adapted to high temperature resistant small-size corrugated filter core.
Description
Technical Field
The invention relates to a filter element, in particular to a brazing filter element and a welding process.
Background
The filter industry develops so far, and a plurality of working conditions can not realize butt joint. Such as ultra-high temperature, ultra-low temperature, high viscosity, small usage space, etc. The temperature is an important condition for using the filter, the maximum using temperature of the common paper filter material is 80 ℃, and the maximum using temperature of the stainless steel material is 350 ℃. The processing technology is also an important factor, and the common technology at present is gluing and welding. The difficulty of adhesion is that the adhesive is suitable for the environment, and the common adhesive can resist the temperature of about 95 ℃. Welding cannot process small-size corrugated filter elements due to equipment and current.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a brazing filter element and a welding process, which are suitable for a small-size corrugated filter element with high temperature resistance.
The brazing filter element is characterized by comprising a bottom cover, an end cover and a stainless steel mesh corrugated filter cylinder, wherein the bottom cover and the end cover are respectively arranged at two ends of the filter cylinder in a sealing mode, the filter cylinder is connected with the bottom cover and the end cover through brazing flux, and inhibitors are coated on the end portions of the two ends of the filter cylinder along the circumference of the filter cylinder.
Further comprises the following steps: two ends of the filter cylinder are respectively positioned in annular grooves formed in the end cover and the bottom cover.
Further comprises the following steps: a closing-in is arranged at one end of the filter cylinder, and the closing-in of the filter cylinder is positioned in an annular groove formed in the bottom cover.
Further comprises the following steps: the end cover is provided with a through hole along the axis thereof, and the through hole is communicated with the interior of the filter cylinder.
A filter element brazing process is characterized by comprising the following steps:
step 1: folding and rolling the sintered stainless steel mesh to obtain a filter cylinder;
step 2: filling brazing flux into annular grooves formed in the end cover and the bottom cover, and then respectively sleeving the end cover and the bottom cover at two ends of the filter cylinder through the annular grooves, so as to obtain a filter element to be brazed;
and step 3: placing the filter element to be brazed in a high-temperature furnace, and setting a welding curve of the high-temperature furnace; wherein the welding profile comprises the steps of:
step 3.1: heating to 300-350 ℃ within 2-3 h, and keeping the temperature for 0.3-0.8 h;
step 3.2: when the brazing flux is silver-based, heating to 800 +/-2 ℃ within 1-2 h, and preserving heat for 1.5-2.5 h; when the brazing flux is nickel-based, heating to 1050 +/-2 ℃ within 1-2 h, and preserving heat for 1.5-2.5 h;
step 3.3: cooling to 350-440 ℃ within 0.5-1.5 h, and preserving heat for 0.3-0.8 h;
step 3.4: and cooling to room temperature and discharging.
Further comprises the following steps: in the step 3, the vacuum degree in the high-temperature furnace is 3 multiplied by 10 during brazing-3Pa～6×10-3Pa。
Further comprises the following steps: in the step 2, the end part of one end of the filter cylinder is closed and then placed into the annular groove of the bottom cover.
Further comprises the following steps: the silver group is BAg-9, or BAg-24, or BAg-37.
Further comprises the following steps: the nickel base is BNi2, or BNi5, or BNi 7.
Further comprises the following steps: in the step 1, when the filtering precision of the filter cylinder is within 1-50 μm, inhibitors are coated on the end parts of the two ends of the filter cylinder along the circumference of the filter cylinder; the inhibitor is used for preventing the brazing flux from being sucked upwards along the filter screen under the action of high temperature to block the pore diameter of the filter cylinder, so that the filtering precision and the flow of the filter element are prevented from being influenced.
The invention has the beneficial effects that: the stainless steel net is fixed between the end cover and the bottom cover in a brazing mode, and the stainless steel net is stable in structure, high in strength and high-temperature resistant.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a sixth embodiment of the present invention;
fig. 7 is a graph of the soldering temperature of the present invention.
In the figure, 1, a bottom cover; 2. a filter cartridge; 3. and (4) end covers.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. It should be noted that the terms of orientation such as left, middle, right, up and down in the examples of the present invention are only relative concepts or reference to the normal use state of the product, and should not be considered as limiting.
A brazing filter element comprises a bottom cover 1, an end cover 3 and a stainless steel mesh corrugated filter cylinder 2, wherein the bottom cover 1 and the end cover 3 are respectively arranged at two ends of the filter cylinder 2 in a sealing mode, the filter cylinder 2 is connected with the bottom cover 1 and the end cover 3 through a brazing flux, and inhibitors are coated on the end portions of two ends of the filter cylinder 2 along the circumference of the filter cylinder; two ends of the filter cartridge 2 are respectively positioned in annular grooves formed in the end cover 3 and the bottom cover 1; a closing-in is arranged at one end of the filter cartridge 2, and the closing-in of the filter cartridge is positioned in an annular groove arranged in the bottom cover 1; the end cover 3 is provided with a through hole along the axis thereof, and the through hole is communicated with the interior of the filter cylinder 2.
A brazing filter element process, comprising the steps of:
step 1: folding and rolling the sintered stainless steel mesh to obtain a filter cylinder 2, and coating an inhibitor on the end parts of the two ends of the filter cylinder 2 along the circumference of the filter cylinder 2 when the filtering precision of the filter cylinder 2 is within 1-50 mu m; when the filtration accuracy of the filter cartridge 2 is 50 μm to 200 μm, it is not necessary to coat an inhibitor on both end portions of the filter cartridge 2 along the circumference thereof. And the two end parts of the filter cylinder 2 are coated with inhibitors along the circumference; step 2: filling brazing flux into annular grooves formed in the end cover 3 and the bottom cover 1, and then respectively sleeving the end cover 3 and the bottom cover 1 at two ends of the filter cartridge 2 through the annular grooves, so as to obtain a filter element to be brazed; and step 3: placing the filter element to be brazed in a high-temperature furnace, and setting a welding curve of the high-temperature furnace; wherein the welding curve comprises the steps of: as shown in fig. 7, step 3.1: heating to 300-350 ℃ within T1= 2-3 h for preheating a hearth and parts; and keeping the temperature T2= 0.3-0.8 h, wherein the heat preservation is to make the temperature of the part uniform, and the other is equipment limitation, equipment protection and electricity saving; step 3.2: when the brazing flux is silver-based, heating to 800 +/-2 ℃ within T3= 1-2 h, and keeping the temperature for T4= 1.5-2.5 h; when the brazing flux is nickel-based, heating to 1050 +/-2 ℃ within T3= 1-2 h, and keeping the temperature for T4= 1.5-2.5 h; step 3.3: cooling to 350-400 ℃ within T5= 0.5-1.5 h, and keeping the temperature for T6= 0.3-0.8 h; step 3.4: t7= 0.5-1 h, cooling to room temperature, and discharging; during brazing, the vacuum degree in the high-temperature furnace is 3 multiplied by 10-3Pa～6×10-3Pa. In the step 2, the end part of one end of the filter cartridge 2 is placed into the annular groove of the bottom cover 1 after being pressed. The stainless steel sensitization temperature range is 450-850 ℃, so that the stainless steel should be prevented from staying in the temperature range for a long time as much as possible; when the degree of vacuum is high, the rate of intergranular fracture due to the sensitization of stainless steel is slower. Wherein the silver group is BAg-9, or BAg-24, or BAg-37; the nickel base is BNi2, or BNi5, or BNi 7.
The first embodiment has other technical characteristics that under the same condition as the brazing filter element, as shown in fig. 1, the bottom surface of the annular groove is a plane, and brazing flux is arranged between the bottom surface of the annular groove and the filter cartridge 2; the end part of the filter cartridge 2 connected with the bottom cover 1 is provided with a compression edge. The middle part of the end cover 3 is provided with a flange, the end part of the right end of the end cover 3 is provided with a pipeline joint nozzle, and the diameter of a through hole in the pipeline joint nozzle is smaller than that of the through hole in the end cover 3. The end cover 3, the bottom cover 1 and the filter cartridge 2 are made of 304 stainless steel, the stainless steel net forming the filter cartridge 2 is a dense-grain net, the specification of the dense-grain net is 165 x 1400/0.071 x 0.04, and the brazing flux is silver-based BAg-9.
The brazing filter element is manufactured according to the operation steps of the brazing filter element, and the welding curve is as follows: heating to 302 +/-2 ℃ within 2h, and keeping the temperature for 0.3 h; heating to 800 +/-2 ℃ within 1h, and keeping the temperature for 1.5 h; cooling to 352 +/-2 ℃ within 0.5h, and keeping the temperature for 0.3 h; and cooling to room temperature and discharging.
In the second embodiment, other technical features are the same as those of the brazed filter cartridge, and as shown in fig. 2, the bottom surface of the annular groove is a flat surface, and a brazing flux is provided between the bottom surface of the annular groove and the filter cartridge 2. The middle part of the end cover 3 is provided with a flange, the end part of the right end of the end cover 3 is provided with a pipeline nozzle, and the diameter of the pipeline nozzle is the same as that of the end cover 3. The end cover 3, the bottom cover 1 and the filter cartridge 2 are made of 304 stainless steel, the stainless steel net forming the filter cartridge 2 is a dense-grain net, the specification of the dense-grain net is 325 multiplied by 2300/0.036 multiplied by 0.025, and the soldering flux is silver-based BAg-24.
The brazing filter element is manufactured according to the operation steps of the brazing filter element, and the welding curve is as follows: heating to 325 +/-2 ℃ within 2h, and keeping the temperature for 0.5 h; heating to 800 +/-2 ℃ within 1.5h, and keeping the temperature for 2 h; cooling to 375 +/-2 ℃ within 1h, and keeping the temperature for 0.5 h; and cooling to room temperature and discharging.
A third embodiment, otherwise technically characterized in that, in the same case as the said one brazed filter element, as shown in fig. 3, the bottom surface of the annular groove is plane, and a brazing flux is provided between the bottom surface of the annular groove and the filter cartridge 2; the end part of the filter cartridge 2 connected with the bottom cover 1 is provided with a compression edge. The end part of the right end of the end cover 3 is provided with a flange, and the diameter of the end part of the outer end of the through hole is larger than that of the end part of the inner end of the through hole. The end cover 3, the bottom cover 1 and the filter cartridge 2 are made of 304 stainless steel, the stainless steel net forming the filter cartridge 2 is a dense-grain net, the specification of the dense-grain net is 200 multiplied by 1400/0.071 multiplied by 0.04, and the soldering flux is silver-based BAg-37.
The brazing filter element is manufactured according to the operation steps of the brazing filter element, and the welding curve is as follows: heating to 348 +/-2 ℃ within 2.5h, and keeping the temperature for 0.8 h; heating to 800 +/-2 ℃ within 2h, and keeping the temperature for 2.5 h; cooling to 438 +/-2 ℃ within 1.5h, and keeping the temperature for 0.8 h; and cooling to room temperature and discharging.
In the fourth embodiment, other technical features are the same as those of the brazed filter cartridge described above, and as shown in fig. 4, the bottom surface of the annular groove is a flat surface, and a brazing flux is provided between the bottom surface of the annular groove and the filter cartridge 2. The middle part of the end cover 3 is provided with a flange, the end part of the right end of the end cover 3 is provided with a pipeline nozzle, and the diameter of the pipeline nozzle is the same as that of the end cover 3. The end cover 3, the bottom cover 1 and the filter cartridge 2 are made of 316L stainless steel, the stainless steel net forming the filter cartridge 2 is a dense-grain net, the specification of the dense-grain net is 165 multiplied by 600/0.071 multiplied by 0.05, and the brazing flux is nickel-based BNi 2.
The brazing filter element is manufactured according to the operation steps of the brazing filter element, and the welding curve is as follows: heating to 302 +/-2 ℃ within 2h, and keeping the temperature for 0.3 h; heating to 1050 +/-2 ℃ within 1h, and keeping the temperature for 1.5 h; cooling to 302 +/-2 ℃ within 0.5h, and keeping the temperature for 0.3 h; and cooling to room temperature and discharging.
In the fifth embodiment, other technical features are the same as those of the brazing filter element described above, and as shown in fig. 5, the bottom surface of the annular groove is a flat surface, and a brazing flux is provided between the bottom surface of the annular groove and the filter cartridge 2. The end cover 3, the bottom cover 1 and the filter cartridge 2 are made of 316L stainless steel, the stainless steel net forming the filter cartridge 2 is a dense-grain net, the specification of the dense-grain net is 50 multiplied by 270/0.14 multiplied by 0.1, and the brazing flux is nickel-based BNi 5.
The brazing filter element is manufactured according to the operation steps of the brazing filter element, and the welding curve is as follows: heating to 325 +/-2 ℃ within 2.5h, and keeping the temperature for 0.5 h; heating to 1050 +/-2 ℃ within 1.5h, and keeping the temperature for 2 h; cooling to 352 +/-2 ℃ within 1h, and keeping the temperature for 0.5 h; and cooling to room temperature and discharging.
A sixth embodiment, otherwise technically characterized in that, in the same case as the brazing filter element, as shown in fig. 6, the bottom surface of the annular groove is a flat surface, and a brazing flux is provided between the bottom surface of the annular groove and the filter cartridge 2; the end part of the filter cartridge 2 connected with the bottom cover 1 is provided with a compression edge. The end part of the right end of the end cover 3 is provided with a flange, and the diameter of the end part of the outer end of the through hole is larger than that of the end part of the inner end of the through hole. The end cover 3, the bottom cover 1 and the filter cartridge 2 are made of 304 stainless steel, the stainless steel net forming the filter cartridge 2 is a square mesh net, the specification of the square mesh net is 0.071/0.056, and the brazing flux is nickel-based BNi 7.
The brazing filter element is manufactured according to the operation steps of the brazing filter element, and the welding curve is as follows: heating to 348 +/-2 ℃ within 3h, and keeping the temperature for 0.8 h; heating to 1050 +/-2 ℃ within 2h, and keeping the temperature for 2.5 h; cooling to 438 +/-2 ℃ within 1.5h, and keeping the temperature for 0.8 h; and cooling to room temperature and discharging.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A filter element brazing process is characterized by comprising the following steps:
step 1: folding and rolling the sintered stainless steel mesh to obtain a filter cylinder;
step 2: filling brazing flux into annular grooves formed in the end cover and the bottom cover, and then respectively sleeving the end cover and the bottom cover at two ends of the filter cylinder through the annular grooves, so as to obtain a filter element to be brazed;
and step 3: placing the filter element to be brazed in a high-temperature furnace, and setting a welding curve of the high-temperature furnace; wherein the welding profile comprises the steps of: step 3.1: heating to 300-350 ℃ within 2-3 h, and keeping the temperature for 0.3-0.8 h; step 3.2: when the brazing flux is silver-based, heating to 800 +/-2 ℃ within 1-2 h, and preserving heat for 1.5-2.5 h; when the brazing flux is nickel-based, heating to 1050 +/-2 ℃ within 1-2 h, and preserving heat for 1.5-2.5 h; step 3.3: cooling to 350-440 ℃ within 0.5-1.5 h, and preserving heat for 0.3-0.8 h; step 3.4: and cooling to room temperature and discharging.
2. A process of brazing a filter element according to claim 1, wherein: in the step 3, the vacuum degree in the high-temperature furnace is 3 multiplied by 10 during brazing-3Pa～6×10-3Pa。
3. A process of brazing a filter element according to claim 2, wherein: in the step 2, the end part of one end of the filter cylinder is closed and then placed into the annular groove of the bottom cover.
4. A process of brazing a filter element according to claim 3, wherein: the silver group is BAg-9, or BAg-24, or BAg-37.
5. A process of brazing a filter element according to claim 3, wherein: the nickel base is BNi2, or BNi5, or BNi 7.
6. A process of brazing a filter element according to claim 5, wherein: in the step 1, when the filtering precision of the filter cylinder is within 1-50 μm, inhibitors are coated on the two end parts of the filter cylinder along the circumference of the filter cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810983752.2A CN108788358B (en) | 2018-08-27 | 2018-08-27 | Brazing filter element and welding process |
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| CN201810983752.2A CN108788358B (en) | 2018-08-27 | 2018-08-27 | Brazing filter element and welding process |
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| CN108788358A CN108788358A (en) | 2018-11-13 |
| CN108788358B true CN108788358B (en) | 2020-11-03 |
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Citations (5)
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| SU416191A1 (en) * | 1971-11-29 | 1974-02-25 | ||
| CN2342868Y (en) * | 1998-09-21 | 1999-10-13 | 龚云明 | Conoid wire winding-up filter screen cylinder of stainless steel |
| CN1326017A (en) * | 2001-05-08 | 2001-12-12 | 徐中立 | Antirusting technology for liquid reservoir made of carbon steel in air conditioner or refrigerator |
| CN202648275U (en) * | 2012-05-18 | 2013-01-02 | 浙江盾安机械有限公司 | Filter-type oil separator |
| CN103566656A (en) * | 2012-08-09 | 2014-02-12 | 新乡市天诚航空净化设备有限公司 | Aerospace pure oxygen filter and welding method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7287684B2 (en) * | 2002-07-03 | 2007-10-30 | Tubular Perforating Mfg., Ltd. | Filter cartridge assembly and method of manufacture |
| CN203183775U (en) * | 2013-04-01 | 2013-09-11 | 何乐平 | Transversely folded filter core |
-
2018
- 2018-08-27 CN CN201810983752.2A patent/CN108788358B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU416191A1 (en) * | 1971-11-29 | 1974-02-25 | ||
| CN2342868Y (en) * | 1998-09-21 | 1999-10-13 | 龚云明 | Conoid wire winding-up filter screen cylinder of stainless steel |
| CN1326017A (en) * | 2001-05-08 | 2001-12-12 | 徐中立 | Antirusting technology for liquid reservoir made of carbon steel in air conditioner or refrigerator |
| CN202648275U (en) * | 2012-05-18 | 2013-01-02 | 浙江盾安机械有限公司 | Filter-type oil separator |
| CN103566656A (en) * | 2012-08-09 | 2014-02-12 | 新乡市天诚航空净化设备有限公司 | Aerospace pure oxygen filter and welding method thereof |
Non-Patent Citations (1)
| Title |
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| 高精度骨架式过滤器的复合连接技术;梁俊民等;《甘肃工业大学学报》;19941231;第20卷(第4期);第7-10页 * |
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