CN211708316U - Stainless steel vacuum casting solder welding layer interface of heat exchanger - Google Patents
Stainless steel vacuum casting solder welding layer interface of heat exchanger Download PDFInfo
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- CN211708316U CN211708316U CN202020141787.4U CN202020141787U CN211708316U CN 211708316 U CN211708316 U CN 211708316U CN 202020141787 U CN202020141787 U CN 202020141787U CN 211708316 U CN211708316 U CN 211708316U
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Abstract
The utility model discloses a heat exchanger stainless steel vacuum fusion casting brazing filler metal welding layer interface, which comprises a stainless steel interface, a ring groove arranged on the end surface to be welded of the stainless steel interface and fusion casting brazing filler metal correspondingly arranged in the ring groove, wherein the fusion casting brazing filler metal adopts one of copper, brass, phosphorus copper and silver brazing filler metal; when in processing, an annular groove is arranged on the end surface to be welded of the stainless steel interface, and fusion casting solder is placed in the annular groove; and assembling the stainless steel interface and the heat exchanger, then putting the assembled stainless steel interface and the heat exchanger into a vacuum furnace for heating, melting and filling the whole annular groove with the fusion-casting brazing filler metal when the stainless steel interface is heated to a melting point, and fusion-casting the fusion-casting brazing filler metal and the high-temperature stainless steel interface together to ensure that the end surface to be welded of the stainless steel interface is the fusion-casting brazing filler metal. The utility model has the advantages that: the welding firmness between the stainless steel interface and the copper pipe is effectively improved, the welding time can be shortened, the production efficiency is improved, the material cost can be greatly reduced, no soldering flux is used during welding, and no pollution is caused to air.
Description
Technical Field
The utility model belongs to the technical field of heat exchanger, concretely relates to heat exchanger stainless steel vacuum fusion casting brazing filler metal welded layer face interface.
Background
The brazed plate heat exchanger is mainly used in a refrigeration system, is used as an evaporator and a condenser, adopts a copper tube and is butted with the system in a welding mode when being connected with the system, adopts gas welding at the present stage, the inlet/outlet interfaces of the brazed plate heat exchanger are all stainless steel, the stainless steel is very easy to oxidize at high temperature in the welding process, the stainless steel is very difficult to fuse with brazing filler metal, false welding and sand holes are easily caused to cause system leakage, scaling powder is required to be used when the copper is welded with the stainless steel, air pollution can be caused, the body of a welder is damaged, the requirement on welding rods is higher, silver welding rods with the silver content of more than 30 percent are required, the welding cost is high, the welding technical requirement on the welder is also high, the heating temperature of two different metals is required to be controlled, the temperature is high, the surface of a stainless steel joint can be oxidized, the temperature is low, and the adhesive force of the welding rods can be reduced, can cause the rosin joint, bring certain degree of difficulty and inconvenience for the welding when the user uses the brazed plate heat exchanger.
Disclosure of Invention
The utility model aims at providing a heat exchanger stainless steel vacuum fusion cast brazing filler metal welding aspect interface is through offering the ring channel on the terminal surface of stainless steel interface and in it arbitrary one of copper, brass, phosphorus copper, silver brazing filler metal is the fusion cast brazing filler metal of material to the terminal surface at the stainless steel interface forms fusion cast brazing filler metal terminal surface, in order to do benefit to the welding between the copper pipe.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
the welding layer interface is characterized by comprising a stainless steel interface, an annular groove formed in the end face to be welded of the stainless steel interface and a casting brazing filler metal correspondingly arranged in the annular groove, wherein the casting brazing filler metal is made of one of copper, brass, phosphorus copper and silver brazing filler metal.
The section of the annular groove is one of square, V-shaped, semicircular and oval.
The depth of the annular groove is between 1 and 5 mm.
The notch of the annular groove is provided with two symmetrically arranged slopes, and the two slopes respectively extend to the inner edge and the outer edge of the end face to be welded of the stainless steel interface.
The top surface of the fusion casting brazing filler metal is flush with the end surface to be welded of the stainless steel interface, so that the end surface to be welded of the stainless steel interface is the fusion casting brazing filler metal.
The fusion casting brazing filler metal and the stainless steel interface are connected in a vacuum fusion casting mode.
A processing and welding method related to any heat exchanger stainless steel vacuum fusion casting brazing filler metal welding layer interface is characterized by comprising the following steps: an annular groove is formed in the end face to be welded of the stainless steel interface, and fusion-casting brazing filler metal is placed in the annular groove; and assembling the stainless steel interface and the heat exchanger, then putting the assembled stainless steel interface and the heat exchanger into a vacuum furnace for heating, melting and filling the whole annular groove by the fusion-casting brazing filler metal when the stainless steel interface is heated to a melting point, and fusion-casting the fusion-casting brazing filler metal and the high-temperature stainless steel interface together, so that the end surface to be welded of the stainless steel interface is the fusion-casting brazing filler metal.
Taking out the stainless steel interface which is finished with casting from the vacuum furnace, inserting a copper pipe to be welded into the stainless steel interface, welding the copper pipe and the stainless steel interface by adopting a welding rod, wherein the welding part is the end surface of the stainless steel interface and the outer wall surface of the copper pipe, the casting brazing filler metal is made of one of copper, brass, phosphor copper and silver brazing filler metal, and the welding rod is made of one of brass, phosphor copper and silver brazing filler metal.
The utility model has the advantages that: the welding firmness between the stainless steel interface and the copper pipe is effectively improved, the welding time can be shortened, the production efficiency is improved, the material cost can be greatly reduced, no soldering flux is used during welding, and no pollution is caused to air.
Drawings
Fig. 1 is a schematic perspective view of a stainless steel interface according to the present invention;
FIG. 2 is a cross-sectional view of a stainless steel interface according to the present invention;
fig. 3 is a partially enlarged schematic view of a portion a of fig. 2 according to the present invention;
FIG. 4 is a schematic view of the stainless steel interface of the present invention disposed on the brazed plate heat exchanger;
FIG. 5 is a cross-sectional view of the stainless steel port of the present invention disposed on a brazed plate heat exchanger;
fig. 6 is a schematic enlarged partial view of a portion B of the stainless steel interface of fig. 5 where the molten solder is disposed in the annular groove of the present invention;
fig. 7 is a schematic view showing a part B of the stainless steel interface of fig. 5 where the casting solder is disposed in the annular groove and vacuum-cast according to the present invention;
FIG. 8 is a schematic view of a stainless steel interface of the present invention with copper tubes;
FIG. 9 is a schematic view of a stainless steel interface and a copper tube according to the prior art;
fig. 10 is a schematic view of the stainless steel interface and the copper pipe provided with the fusion-cast brazing filler metal welding layer surface of the present invention;
fig. 11 is a schematic view of the welding completion of the stainless steel interface and the copper pipe provided with the fusion-cast brazing filler metal welding layer surface of the present invention;
FIG. 12 is a cross-sectional view of the stainless steel interface of the present invention welded to a copper pipe after vacuum casting of the copper welding surface;
fig. 13 is a cross-sectional view of the welded copper tube after the brazing material is vacuum cast at the stainless steel interface of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example with reference to the accompanying drawings, for the understanding of those skilled in the art:
referring to fig. 1-13, the labels 1-7 in the figures are: stainless steel interface 1, ring channel 2, slope 3, brazed plate heat exchanger 4, casting brazing filler metal 5, copper pipe 6, brazing solder 7.
Example (b): as shown in fig. 1 to 13, the present embodiment specifically relates to a stainless steel vacuum fusion casting brazing filler metal welding layer interface of a heat exchanger, where the welding layer interface includes a stainless steel interface 1, an annular groove 2 formed in the stainless steel interface 1, and a fusion casting brazing filler metal 5 correspondingly fusion-cast in the annular groove 2.
As shown in fig. 1 to 7, the stainless steel interface 1 in the present embodiment is specifically disposed on the brazed plate heat exchanger 4 and used as an inlet/outlet interface, and the adopted material is stainless steel; the annular groove 2 is formed in the end face to be welded of the stainless steel interface 1, the forming depth of the annular groove 2 is 1-5mm, the cross section of the annular groove 2 can be one of square, V-shaped, semicircular and oval, the embodiment specifically adopts the square cross section, it is to be noted that the middle lower part of the annular groove 2 is of a square structure, two inner side wall surfaces of the annular groove 2 are respectively spaced from the inner wall surface and the outer wall surface of the stainless steel interface 1, an upper notch of the annular groove 2 is provided with two symmetrically arranged slopes 3, the slopes 3 have a certain inclination angle, and the two slopes 3 respectively extend to the inner edge and the outer edge of the end face to be welded of the stainless steel interface 1, as shown in fig. 3. If a V-shaped groove, a semicircular groove or an oval groove is adopted, the top end of the notch is arranged at the inner edge and the outer edge of the end face to be welded.
As shown in fig. 1 to 7, a casting solder 5 is correspondingly cast in the annular groove 2, the molten casting solder 5 completely fills the annular groove 2 after being melted, and the top surface of the casting solder 5 is flush with the end surface to be welded of the stainless steel interface 1, so that the end surface to be welded of the stainless steel interface 1 is the upper surface of the casting solder 5, and the end surface to be welded of the stainless steel interface 1, which is originally made of a stainless steel material, is changed into the material of the casting solder 5. The material adopted by the casting brazing filler metal 5 in the embodiment can be one or a combination of copper, brass, phosphor copper and silver brazing filler metal, is the same as or close to the material of the copper pipe 6 to be welded subsequently, the surface adhesive force of copper is very good, and the welding between copper is very easy.
It should be noted that, in order to increase the casting firmness between the casting solder 5 and the stainless steel interface 1, in the process of grooving the annular groove 2 on the stainless steel interface 1, continuous grooves may be formed at intervals on the inner side wall surface of the annular groove 2, so that in the process of casting the casting solder 5, the solder of the casting solder 5 is melted into the grooves, and the casting firmness is increased.
As shown in fig. 1 to 13, the method for processing and welding the interface of the welding layer of the vacuum melting and casting brazing filler metal for the heat exchanger in this embodiment specifically includes the following steps:
(1) as shown in fig. 1, 2 and 3, an annular groove 2 is formed in the stainless steel joint 1, and the square groove shown in fig. 3 is taken as an example in the present embodiment.
(2) As shown in fig. 4 and 5, the grooved stainless steel interface 1 is assembled with a brazing plate heat exchanger 4, a processed casting brazing filler metal 5 matched with the annular groove 2 is placed in the annular groove 2 of the stainless steel interface 1, the casting brazing filler metal 5 may be made of different materials, such as brazing materials of copper, brass, phosphor copper, silver brazing filler metal, etc., and the volume of the casting brazing filler metal 5 should be the same as the volume of the annular groove 2; and then placing the brazed plate heat exchanger 4 and the stainless steel interface 1 on the brazed plate heat exchanger into a vacuum furnace together for vacuum fusion welding and fusion casting.
(3) As shown in fig. 4, 5, 6 and 7, the brazed plate heat exchanger 4 is heated to a certain temperature in a vacuum furnace to reach the melting point of copper, and the high-temperature corrugated stainless steel plates are firmly welded together by the molten copper foil between the stainless steel plates, so that the brazed plate heat exchanger 4 is welded; meanwhile, the fusion casting brazing filler metal 5 in the annular groove 2 of the stainless steel interface 1 is fused and then closely fused with the high-temperature stainless steel interface 1, the whole annular groove 2 is filled, and the whole welding process of the brazing plate type heat exchanger 4 and the stainless steel interface 1 is finished through once entering a vacuum furnace. Because all welding processes are carried out in a vacuum furnace, the problem of oxidation does not exist, the welding firmness is greatly improved, and a flat welding layer surface made of brazing materials or copper materials is formed on the end surface to be welded of the stainless steel interface 1.
(4) As shown in fig. 8-13, the copper tube 6 is inserted into the mouth of the stainless steel interface 1 to a certain depth, and the copper tube 6 is welded to the end surface of the stainless steel interface 1 by using a brazing solder 7 (welding rod), the welding position is the end surface of the stainless steel interface 1 and the side wall surface of the copper tube 6, the brazing solder 7 is made of one of brass, phosphor copper and silver solder, and the casting solder 5 is made of one of copper, brass, phosphor copper and silver solder; in the embodiment, the brazing solder 7 is made of the same material as the casting solder 2, the brazing solder 7 and the casting solder 2 are melted into a whole, and the comparison of the cross sections shown in fig. 13 shows that the welding surface area is obviously increased, the strength is greatly improved, the welding is very easy, and the welding quality is very good.
The beneficial effect of this embodiment lies in: can make the welding of brazed plate heat exchanger and copper pipe way become very easy, and very firm reliable, shorten the welding time, improve production efficiency, and can greatly reduced material cost, scaling powder is not used during the welding, there is not pollution to the air, it is the welding between two kinds of different metals (stainless steel and copper) in the past, become the welding between the same kind of metal (copper and copper) now, the surface adhesion of copper is very good, the welding between copper and the copper is very easy, or the welding of a brazing filler metal and copper, if the casting brazing material in the groove, the user chooses the same kind of welding rod for use during the welding, as long as the temperature of copper reaches the melting point of welding rod, the welding rod will be welded on the surface of copper, and fuse together with the brazing filler metal in the groove, make the welding firm reliable, light and easy.
Claims (6)
1. The welding layer interface is characterized by comprising a stainless steel interface, an annular groove formed in the end face to be welded of the stainless steel interface and a casting brazing filler metal correspondingly arranged in the annular groove, wherein the casting brazing filler metal is made of one of copper, brass, phosphorus copper and silver brazing filler metal.
2. The heat exchanger stainless steel vacuum fusion cast solder weld level interface of claim 1, wherein the annular groove has a cross-section in the shape of one of a square, a V, a semi-circle, and an oval.
3. A heat exchanger stainless steel vacuum fusion cast solder weld level interface as claimed in claim 1, wherein the depth of the annular groove is between 1-5 mm.
4. A heat exchanger stainless steel vacuum fusion casting solder weld level interface as claimed in claim 1, wherein the notch of the annular groove has two symmetrically disposed slopes, both slopes extending to the inner and outer edges of the end surface to be welded of the stainless steel interface, respectively.
5. The heat exchanger stainless steel vacuum fusion cast solder weld face interface of claim 4, wherein the top surface of the fusion cast solder is flush with the end surfaces to be welded of the stainless steel interface, so that the end surfaces to be welded of the stainless steel interface are the fusion cast solder.
6. The heat exchanger stainless steel vacuum fusion cast solder weld level interface of claim 1, wherein the fusion cast solder is vacuum fusion cast with the stainless steel interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020141787.4U CN211708316U (en) | 2020-01-22 | 2020-01-22 | Stainless steel vacuum casting solder welding layer interface of heat exchanger |
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| CN202020141787.4U CN211708316U (en) | 2020-01-22 | 2020-01-22 | Stainless steel vacuum casting solder welding layer interface of heat exchanger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110977077A (en) * | 2020-01-22 | 2020-04-10 | 纪尚忠 | Heat exchanger stainless steel vacuum casting brazing filler metal welding layer interface and processing welding method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110977077A (en) * | 2020-01-22 | 2020-04-10 | 纪尚忠 | Heat exchanger stainless steel vacuum casting brazing filler metal welding layer interface and processing welding method |
| WO2021147533A1 (en) * | 2020-01-22 | 2021-07-29 | 纪尚忠 | Heat exchanger stainless steel vacuum casting brazing filler metal welding plane connector and machining and welding method |
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