CN103978291A - Corrugated plate, corrugated plate bundle and welding method - Google Patents
Corrugated plate, corrugated plate bundle and welding method Download PDFInfo
- Publication number
- CN103978291A CN103978291A CN201410046119.2A CN201410046119A CN103978291A CN 103978291 A CN103978291 A CN 103978291A CN 201410046119 A CN201410046119 A CN 201410046119A CN 103978291 A CN103978291 A CN 103978291A
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- China
- Prior art keywords
- straight flange
- wave card
- welding
- corrugated plating
- end assembly
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
- F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
-
- 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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
- B23K26/26—Seam welding of rectilinear seams
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a corrugated plate for a plate-type heat exchanger. A plate tube comprises a first corrugated plate body and a second corrugated plate body. The corrugated plate also comprises two first straight-sided protection plates and two second straight-sided protection plates, each first straight-sided protection plate is respectively fixed on the outer side of a welded straight side on the end part of each first corrugated plate in a spot welding manner, each second straight-sided protection plate is respectively fixed on the outer side of a welded straight side on the end part of each second corrugated plate in a spot welding manner, and the first straight-sided protection plate, the first corrugated plate end welded straight side, the second corrugated plate end part welded straight side and the second straight-sided protection plate on each same side of the corrugated plate are welded together. By adding the first straight-sided protection plates, the second straight-sided protection plates and weld-seam metal, the strength of the weld seam is greatly improved, and the corrosion resistance is improved.
Description
Technical field
The present invention relates to a kind of heat-exchangers of the plate type, relate in particular to a kind of corrugated plating, corrugated plating plate bundle and welding method.
Background technology
Heat-exchangers of the plate type is the new and effective heat exchanger of one being formed by a series of sheet metal closed assemblies with certain bellows-shaped.Between various plates, form thin rectangular shape passage, carry out exchange heat by plate.It is compared with conventional shell-and-tube exchanger, and under identical flow resistance and pump power Expenditure Levels, its heat transfer coefficient will exceed a lot, is therefore more widely used.
Solder type heat-exchangers of the plate type is used widely in industries such as chemical fertilizer industry, iron and steel, petrochemical industry.But because welding unit (corrugated plating) solder side of solder type heat-exchangers of the plate type is large, plate is thinner, the problems such as ubiquity weld defect, reliability are not high, thereby bring equipment to reprocess or the problem such as inconvenient maintenance, even impact is produced, and polluted product causes greater loss.Therefore, raising corrugated plating soldering reliability is just very urgent.
Therefore, be necessary to provide a kind of improved system and method to solve above-mentioned technical problem.
Summary of the invention
The present invention is that the corrugated plating in order to solve existing heat-exchangers of the plate type exists the problem that after welding, the strength of materials reduces and corrosion resistance reduces, one aspect of the present invention is to propose a kind of corrugated plating for heat-exchangers of the plate type (100), this corrugated plating (100) comprises first wave card body (102) and Second Wave card body (104), the both sides of this first wave card body (102) respectively comprise first wave card end assembly welding straight flange (103), the both sides of this Second Wave card body (104) respectively comprise Second Wave card end assembly welding straight flange (105), it is characterized in that: this corrugated plating (100) also comprises two the first straight flange backplates (203) and two the second straight flange backplates (204), each the first straight flange backplate (203) respectively spot welding is fixed on the outside of each first wave card end assembly welding straight flange (103), each the second straight flange backplate (205) respectively spot welding is fixed on the outside of each Second Wave card end assembly welding straight flange (105), in the both sides of this corrugated plating (100), this of the same side the first straight flange backplate (203), this first wave card end assembly welding straight flange (103), this Second Wave card end assembly welding straight flange (105) and this second straight flange backplate (205) weld together.
Corrugated plating for plate heat exchanger as above (100), wherein, the width of this first straight flange backplate (203) is 40% ~ 80% of this first wave card end assembly welding straight flange (103) length of side, and the width of this second straight flange backplate (205) is 40% ~ 80% of this Second Wave card end assembly welding straight flange (105) length of side.
Corrugated plating for plate heat exchanger as above (100), wherein, the material of this first straight flange backplate (203) and this second straight flange backplate (205) is consistent with this first wave card body (102).
The present invention is to provide a kind of corrugated plating plate bundle (200) that adopts corrugated plating as above (100) to make on the other hand, wherein, this corrugated plating plate bundle (200) comprises that multiple corrugated platings (100) are welded, and the seal face (108) between the outside of this first corrugated sheet body (102) of each corrugated plating (100) and the outside of this second corrugated sheet body (104) of each corrugated plating (100) welds together.
The welding method (300) that is to provide on the one hand more a kind of corrugated plating for plate heat exchanger of the present invention, is characterized in that: the method comprises the steps:
By spot welding, two the first straight flange backplates (203) are individually fixed in to the outside of the first wave card end assembly welding straight flange (103) of corrugated plating (100) both sides;
By spot welding, two the second straight flange backplates (205) are individually fixed in to the outside of the Second Wave card end assembly welding straight flange (105) of corrugated plating (100) both sides; And
Respectively this first straight flange backplate (203) of this corrugated plating (100) the same side, this first wave card end assembly welding straight flange (103), this Second Wave card end assembly welding straight flange (105) and this second straight flange backplate (205) are welded together by welding procedure.
Method (300) as mentioned above, wherein, the width of this first straight flange backplate (203) is 40% ~ 80% of this first wave card end assembly welding straight flange (103) length of side, and the width of this second straight flange backplate (205) is 40% ~ 80% of this Second Wave card end assembly welding straight flange (105) length of side.
Method (300) as mentioned above, wherein, the material of this first straight flange backplate (203) and this second straight flange backplate (205) is consistent with this first wave card body (102).
Method (300) as mentioned above, wherein, this welding procedure comprises argon arc welding, plasma weldering, Laser Welding, plasma or laser built-up welding.
Corrugated plating, corrugated plating plate bundle and the welding method the invention discloses is compared with traditional solder type heat-exchangers of the plate type, adopt in the time that the first wave card end assembly welding straight flange to corrugated plating and Second Wave card end assembly welding straight flange carry out welding resistance, add the first straight flange backplate in the outside of this first wave card end assembly welding straight flange respectively, add the second straight flange backplate in the outside of Second Wave card end assembly welding straight flange.On the one hand, can increase welding pool width, welding current is large, and pool depth increases, and molten pool metal increases, and is difficult for forming weldering partially.On the other hand, the increase of the first straight flange backplate, the second straight flange backplate and weld metal increases considerably weld strength, and decay resistance strengthens.
Brief description of the drawings
Fig. 1 is a kind of embodiment schematic diagram of corrugated plating;
Fig. 2 is a kind of embodiment schematic diagram that adopts the corrugated plating plate bundle that corrugated plating as shown in Figure 1 makes;
Fig. 3 is the partial structurtes schematic diagram before first wave card body and Second Wave card body assembly welding;
Fig. 4 is the corrugated plating partial structurtes schematic diagram that adopts prior welding mode to be welded into;
Fig. 5 is the corrugated plating partial structurtes schematic diagram that adopts welding manner of the present invention to be welded into; And
Fig. 6 is the welding method flow chart of corrugated plating.
Detailed description of the invention
The structure of corrugated plating in traditional heat-exchangers of the plate type is described, a kind of embodiment schematic diagram that Fig. 1 is corrugated plating in conjunction with Fig. 1 and Fig. 3.This corrugated plating 100 comprises first wave card body 102 and Second Wave card body 104.In one embodiment, this first wave card body 102 and this Second Wave card body can all adopt and be less than the stainless steel material of 1 millimeter and make.The both sides of this first wave card body 102 respectively comprise a first wave card end assembly welding straight flange 103, and the both sides of this Second Wave card body 104 respectively comprise a Second Wave card end assembly welding straight flange 105.After this first wave card end assembly welding straight flange 103 of these first wave card body 102 both sides and this Second Wave card end assembly welding straight flange 105 of these Second Wave card body 104 both sides welds respectively, this first wave card body 102 can form this corrugated plating 100 with this Second Wave card body 104.
The structure of traditional heat-exchangers of the plate type medium wave floor plates bundle is described in conjunction with Fig. 1 and Fig. 2, and Fig. 2 is a kind of embodiment schematic diagram that adopts the corrugated plating plate bundle that corrugated plating 100 as shown in Figure 1 makes.This corrugated plating plate bundle 200 comprises that multiple corrugated platings 100 are as shown in Figure 1 welded, and the seal face 108 between the outside of this first corrugated sheet body 102 of each corrugated plating 100 and the outside of the second corrugated sheet body 104 of each corrugated plating 100 welds together.
Fig. 3 is the partial structurtes schematic diagram before first wave card body 102 and Second Wave card body 104 assembly weldings.Fig. 3 has only illustrated the half structure of corrugated plating 100 as shown in Figure 1, and its second half be symmetrical structure with it.Before welding, the first wave card end assembly welding straight flange 103 of this first wave card body 102 and the Second Wave card end assembly welding straight flange of this Second Wave card body 104 105 are aimed at and are close together, in the time adopting prior welding mode, as shown in Figure 4, Fig. 4 is the corrugated plating partial structurtes schematic diagram that adopts common welding manner to be welded into welding method.When welding, the first wave card end assembly welding straight flange 103 after aiming at and the end face of Second Wave card end assembly welding straight flange 105 are welded to form welding pool 107, the width of welding pool 107 is d1, and d1 is the twice of these the first corrugated sheet body 102 thickness.This welding procedure comprises argon arc welding, plasma weldering, Laser Welding, plasma or laser built-up welding.But, the problem such as because the solder side of this corrugated plating 100 is large, plate is thinner, and ubiquity weld defect, reliability are not high.For improving the soldering reliability of corrugated plating, the invention provides the corrugated plating that a kind of welding method forms, its detailed description of the invention is as follows.
Detailed description of the invention one, is elaborated to present embodiment in conjunction with Fig. 5, and Fig. 5 is the corrugated plating partial structurtes schematic diagram that adopts welding manner of the present invention to be welded into.In the present embodiment, corrugated plating 100 for plate heat exchanger comprises first wave card body 102 and Second Wave card body 104, the both sides of this first wave card body 102 respectively comprise first wave card end assembly welding straight flange 103, and the both sides of this Second Wave card body 104 respectively comprise Second Wave card end assembly welding straight flange 105.In present embodiment, this corrugated plating 100 also comprises two the first straight flange backplates 203 and two the second straight flange backplates 204, each the first straight flange backplate 203 respectively spot welding is fixed on the outside of each first wave card end assembly welding straight flange 103, each the second straight flange backplate 205 respectively spot welding is fixed on the outside of each Second Wave card end assembly welding straight flange 105, in the both sides of this corrugated plating 100, this of the same side the first straight flange backplate 203, this first wave card end assembly welding straight flange 103, this Second Wave card end assembly welding straight flange 105 and this second straight flange backplate 205 weld together.
By the welding manner of present embodiment, connecting end surface place at this first wave card body 104 and this Second Wave card body 104 forms welding pool 207, the width of this welding pool 207 is d2, in the time that the thickness of this first straight flange backplate 203 and this second straight flange backplate 205 is identical with this Second Wave card body 104 with this first wave card body 102, can double compared with the welding pool width d1 of welding pool width d2 and the generation of tradition side's welding method above.Welding method in present embodiment is compared with the traditional welding method shown in Fig. 4, and on the one hand, welding current is large, and pool depth is dark, and molten pool metal amount increases, and is difficult for forming weldering partially.On the other hand, the first straight flange backplate 203, the second straight flange backplate 205 increase considerably weld strength with the increase of weld metal, and decay resistance strengthens.
Detailed description of the invention two, illustrates present embodiment in conjunction with Fig. 5.In the present embodiment, the width h1 of this first straight flange backplate 203 is 40% ~ 80% of this first wave card end assembly welding straight flange 103 length of side h2.Corresponding, the width h1 of this second straight flange backplate 205 is 40% ~ 80% of this Second Wave card end assembly welding straight flange 105 length of side h2.
Detailed description of the invention three, illustrates present embodiment in conjunction with Fig. 5.In the present embodiment, the material of this first straight flange backplate 203 and this second straight flange backplate 205 is consistent with this first wave card body 102.In some embodiments, the material of this first wave card body 102 can comprise the stainless steel of Multiple Type, as 304,316L, 321,2205 etc.
Detailed description of the invention four, illustrates present embodiment in conjunction with Fig. 2 and Fig. 5.In the present embodiment, employing is as shown in Figure 5 increased to the first straight flange backplate 203, the corrugated plating 100 that the welding manner of the second straight flange backplate 205 is made for the manufacture of corrugated plating plate bundle 200, this corrugated plating plate bundle 200 comprises that multiple corrugated platings 100 are welded, and the seal face 108 between the outside of this first corrugated sheet body 102 of each corrugated plating 100 and the outside of the second corrugated sheet body 104 of each corrugated plating 100 welds together.
Detailed description of the invention five, illustrates this detailed description of the invention in conjunction with Fig. 6.Fig. 6 is the welding method flow chart of heat-exchangers of the plate type.The method comprises the steps: step 301, by spot welding, two the first straight flange backplates 203 is individually fixed in to the outside of the first wave card end assembly welding straight flange 103 of corrugated plating 100 both sides.Step 302, is individually fixed in two the second straight flange backplates 205 by spot welding the outside of the Second Wave card end assembly welding straight flange 105 of corrugated plating 100 both sides.Step 303, is welded together this first straight flange backplate 203 of these corrugated plating 100 the same sides, this first wave card end assembly welding straight flange 103, this Second Wave card end assembly welding straight flange 105 and this second straight flange backplate 205 respectively by welding procedure.
Detailed description of the invention six, illustrates this detailed description of the invention in conjunction with Fig. 5 and Fig. 6.In step 301, the width h1 of this first straight flange backplate 203 is 40% ~ 80% of this first wave card end assembly welding straight flange 103 length of side h2.Corresponding, the width h1 of this second straight flange backplate 205 is 40% ~ 80% of this Second Wave card end assembly welding straight flange 105 length of side h2.
In some embodiments, in step 301 and 302, the material of this first straight flange backplate 203 and this second straight flange backplate 205 is consistent with this first wave card body 102.
In some embodiments, in step 303, this welding procedure comprises argon arc welding, plasma weldering, Laser Welding, plasma or laser built-up welding.
For above embodiment, after welding finishes, need to implement range estimation, hydraulic pressure intensity, the inspection such as airtight.
Although describe the present invention in conjunction with specific embodiment, those skilled in the art will appreciate that and can make many amendments and modification to the present invention.Therefore, recognize, the intention of claims is to be encompassed in all such modifications and the modification in true spirit of the present invention and scope.
Claims (8)
1. the corrugated plating for heat-exchangers of the plate type (100), this corrugated plating (100) comprises first wave card body (102) and Second Wave card body (104), the both sides of this first wave card body (102) respectively comprise first wave card end assembly welding straight flange (103), the both sides of this Second Wave card body (104) respectively comprise Second Wave card end assembly welding straight flange (105), it is characterized in that: this corrugated plating (100) also comprises two the first straight flange backplates (203) and two the second straight flange backplates (204), each the first straight flange backplate (203) respectively spot welding is fixed on the outside of each first wave card end assembly welding straight flange (103), each the second straight flange backplate (205) respectively spot welding is fixed on the outside of each Second Wave card end assembly welding straight flange (105), in the both sides of this corrugated plating (100), this of the same side the first straight flange backplate (203), this first wave card end assembly welding straight flange (103), this Second Wave card end assembly welding straight flange (105) and this second straight flange backplate (205) weld together.
2. the corrugated plating for heat-exchangers of the plate type as claimed in claim 1 (100), wherein, the width of this first straight flange backplate (203) is 40% ~ 80% of this first wave card end assembly welding straight flange (103) length of side, and the width of this second straight flange backplate (205) is 40% ~ 80% of this Second Wave card end assembly welding straight flange (105) length of side.
3. the corrugated plating for heat-exchangers of the plate type as claimed in claim 1 (100), wherein, the material of this first straight flange backplate (203) and this second straight flange backplate (205) is consistent with this first wave card body (102).
4. the corrugated plating plate bundle (200) that adopts the corrugated plating for heat-exchangers of the plate type as claimed in claim 1 (100) to make, wherein, this corrugated plating plate bundle (200) comprises that multiple corrugated platings (100) are welded, and the seal face (108) between the outside of this first corrugated sheet body (102) of each corrugated plating (100) and the outside of this second corrugated sheet body (104) of each corrugated plating (100) welds together.
5. the welding method of a corrugated plating (300), is characterized in that: the method comprises the steps:
By spot welding, two the first straight flange backplates (203) are individually fixed in to the outside of the first wave card end assembly welding straight flange (103) of corrugated plating (100) both sides;
By spot welding, two the second straight flange backplates (205) are individually fixed in to the outside of the Second Wave card end assembly welding straight flange (105) of corrugated plating (100) both sides; And
Respectively this first straight flange backplate (203) of this corrugated plating (100) the same side, this first wave card end assembly welding straight flange (103), this Second Wave card end assembly welding straight flange (105) and this second straight flange backplate (205) are welded together by welding procedure.
6. method (300) as claimed in claim 5, wherein, the width of this first straight flange backplate (203) is 40% ~ 80% of this first wave card end assembly welding straight flange (103) length of side, and the width of this second straight flange backplate (205) is 40% ~ 80% of this Second Wave card end assembly welding straight flange (105) length of side.
7. method (300) as claimed in claim 5, wherein, the material of this first straight flange backplate (203) and this second straight flange backplate (205) is consistent with this first wave card body (102).
8. method (300) as claimed in claim 5, wherein, this welding procedure comprises argon arc welding, plasma weldering, Laser Welding, plasma or laser built-up welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410046119.2A CN103978291A (en) | 2014-02-10 | 2014-02-10 | Corrugated plate, corrugated plate bundle and welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410046119.2A CN103978291A (en) | 2014-02-10 | 2014-02-10 | Corrugated plate, corrugated plate bundle and welding method |
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| Publication Number | Publication Date |
|---|---|
| CN103978291A true CN103978291A (en) | 2014-08-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410046119.2A Pending CN103978291A (en) | 2014-02-10 | 2014-02-10 | Corrugated plate, corrugated plate bundle and welding method |
Country Status (1)
| Country | Link |
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| CN (1) | CN103978291A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834652A (en) * | 2016-05-30 | 2016-08-10 | 兰州兰石集团有限公司 | Plate pair laser welding fixing and gas protection tool |
| CN108335865A (en) * | 2018-04-08 | 2018-07-27 | 上海置信电气非晶有限公司 | A kind of fuel tank corrugate fin group and its welding method, corrugated tank of transformer |
| CN110186309A (en) * | 2019-06-28 | 2019-08-30 | 宁波市哈雷换热设备有限公司 | A kind of energy exchange plate and its manufacturing method |
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| JP2005180821A (en) * | 2003-12-19 | 2005-07-07 | Toyo Radiator Co Ltd | Element for heat exchanger and its manufacturing method |
| CN101045269A (en) * | 2006-03-30 | 2007-10-03 | 株式会社聚源 | Method for manufacturing a heat exchanger |
| CN102575905A (en) * | 2009-05-18 | 2012-07-11 | 阿法拉伐维卡勃公司 | Method for manufacturing a bundle of plates for a heat exchanger |
| CN102933929A (en) * | 2010-06-18 | 2013-02-13 | 阿尔法拉瓦尔股份有限公司 | Plate heat exchanger and method of producing a plate heat exchanger |
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2014
- 2014-02-10 CN CN201410046119.2A patent/CN103978291A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005180821A (en) * | 2003-12-19 | 2005-07-07 | Toyo Radiator Co Ltd | Element for heat exchanger and its manufacturing method |
| CN101045269A (en) * | 2006-03-30 | 2007-10-03 | 株式会社聚源 | Method for manufacturing a heat exchanger |
| CN102575905A (en) * | 2009-05-18 | 2012-07-11 | 阿法拉伐维卡勃公司 | Method for manufacturing a bundle of plates for a heat exchanger |
| CN102933929A (en) * | 2010-06-18 | 2013-02-13 | 阿尔法拉瓦尔股份有限公司 | Plate heat exchanger and method of producing a plate heat exchanger |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105834652A (en) * | 2016-05-30 | 2016-08-10 | 兰州兰石集团有限公司 | Plate pair laser welding fixing and gas protection tool |
| CN105834652B (en) * | 2016-05-30 | 2018-07-10 | 兰州兰石集团有限公司 | Plate is fixed by Laser Welding and gas shield tooling |
| CN108335865A (en) * | 2018-04-08 | 2018-07-27 | 上海置信电气非晶有限公司 | A kind of fuel tank corrugate fin group and its welding method, corrugated tank of transformer |
| CN110186309A (en) * | 2019-06-28 | 2019-08-30 | 宁波市哈雷换热设备有限公司 | A kind of energy exchange plate and its manufacturing method |
| CN110186309B (en) * | 2019-06-28 | 2024-04-09 | 宁波市哈雷换热设备有限公司 | Energy exchange plate and manufacturing method thereof |
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Application publication date: 20140813 |
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