CN108387000B - Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger - Google Patents
Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger Download PDFInfo
- Publication number
- CN108387000B CN108387000B CN201810320306.3A CN201810320306A CN108387000B CN 108387000 B CN108387000 B CN 108387000B CN 201810320306 A CN201810320306 A CN 201810320306A CN 108387000 B CN108387000 B CN 108387000B
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- heat exchanger
- heat exchange
- welding
- stainless steel
- mounting plate
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 57
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 title claims abstract description 12
- 238000003466 welding Methods 0.000 claims abstract description 157
- 238000004891 communication Methods 0.000 claims abstract description 40
- 238000002955 isolation Methods 0.000 claims abstract description 38
- 238000005219 brazing Methods 0.000 claims description 30
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 239000003546 flue gas Substances 0.000 description 7
- 238000006056 electrooxidation reaction Methods 0.000 description 6
- 239000010953 base metal Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/163—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
- F28F21/083—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys from stainless steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
- F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Fluid Heaters (AREA)
Abstract
The application discloses a stainless steel heat exchanger, a gas water heating device and a manufacturing method of the heat exchanger. Wherein, stainless steel heat exchanger includes: a mounting plate; a plurality of heat exchange tubes; the heat exchange tube is fixedly connected with the mounting plate through a first welding part; a communication structure having a communication space; the communicating space communicates the pipe ends of two or more heat exchange pipes to form a flow passage; the communication structure is connected with the mounting plate and/or the heat exchange tube; an isolation part; the isolation portion isolates the first welded portion from the flow passage. The stainless steel heat exchanger, the gas water heating device and the heat exchanger provided by the application can ensure that the welding part of the heat exchange tube is not easy to corrode, and the service life is prolonged.
Description
Technical Field
The application relates to the field of heat exchangers, in particular to a stainless steel heat exchanger, a gas water heating device and a manufacturing method of the heat exchanger.
Background
The gas water heater is a gas appliance which takes gas as fuel and transfers heat to cold water flowing through a heat exchanger in a combustion heating mode so as to achieve the purpose of preparing hot water. At present, a heat exchanger used in a gas water heater mainly comprises a surrounding frame, a plurality of heat exchange tubes provided with fins in a penetrating manner and a U-shaped connector arranged outside the surrounding frame to connect the ends of the heat exchange tubes in pairs, wherein the U-shaped connector enables all the heat exchange tubes to form a continuous flow channel. However, in the processing process, each joint is connected with the end head of the heat exchange tube by brazing independently, so that the operation is complex and the labor hour is consumed. Along with the extension of the service time, the problem of corrosion and water leakage can occur at the brazing welding part, so that the service life of the heat exchanger is reduced.
In the prior art, there is a heat exchanger structure which adopts a water collecting box to communicate heat exchange pipes of a heat exchanger, the heat exchange pipes are communicated through a sealing cover plate provided with a convex hull to form a flow channel, the sealing cover plate is covered on a mounting plate on one side of the heat exchanger, the ends of the heat exchange pipes to be communicated are communicated through a connecting channel of the convex hull structure, however, the brazing welding parts of the ends of the heat exchange pipes, which are in contact with water, are easily corroded and damaged in the use process, and the service life of the heat exchanger is influenced.
Disclosure of Invention
The inventors have long studied and found that the solder material at the end welding part of the heat exchange tube of the heat exchanger of the above-mentioned type is different from the heat exchanger itself, so that when the welding part (weld joint) is in contact with the heat exchange medium (water), there is a potential difference between the two metal materials, and electrochemical corrosion is generated, and particularly in the case of the heat exchanger made of stainless steel and the heat exchanger made of brazing or nickel solder, the corrosion phenomenon is more prominent, and the welding part is corroded and destroyed with long-time use.
In addition, the heat exchanger in the gas water heater heats the water in the heat exchange tube through heat exchange with the high-temperature flue gas formed by the burner. After a user stops the machine (such as stopping using hot water with a water end), water in the heat exchange tube stops flowing, but high-temperature flue gas still exists in the gas water heater, the high-temperature flue gas can continuously heat the water staying in the heat exchange tube, and the water in the heat exchange tube is in a static state at the moment and cannot take away heat transferred by the high-temperature flue gas, so that the water in the heat exchange tube can be heated to an excessive temperature, and the welding part is corroded and damaged more rapidly under the action of the excessive temperature water.
In order to solve the problems, the application provides a stainless steel heat exchanger, a gas water heating device and a manufacturing method of the heat exchanger.
A stainless steel heat exchanger comprising:
a mounting plate;
a plurality of heat exchange tubes; the heat exchange tube is fixedly connected with the mounting plate through a first welding part;
a communication structure having a communication space; the communicating space communicates the pipe ends of two or more heat exchange pipes to form a flow passage; the communication structure is connected with the mounting plate and/or the heat exchange tube;
an isolation part; the isolation portion isolates the first welded portion from the flow passage.
Preferably, the isolation part comprises a second welding part for connecting the mounting plate and the heat exchange tube; the second welded portion is welded differently from the first welded portion.
Preferably, the second welding portion is formed by laser welding or argon arc welding, and the first welding portion is formed by brazing.
Preferably, the brazing filler metal is copper or nickel.
Preferably, the communication structure is connected with the mounting plate and/or the heat exchange tube through a third welding part.
Preferably, the communication structure comprises a cover plate arranged at one side of the mounting plate; the cover plate is provided with a protruding part protruding along the direction away from the mounting plate and a second connecting part positioned around the protruding part; the inside of the protruding part forms the communication space; the second connecting portion is connected with the mounting plate through the third welding portion to seal the periphery of the protruding portion.
Preferably, the mounting plate is provided with a first connecting part sleeved outside the heat exchange tube; the first welding part is used for connecting the first connecting part with the outer wall of the heat exchange tube; the second weld is closer to the tube end of the heat exchange tube than the first weld to isolate the first weld from the flow passage.
Preferably, the first connecting portion extends in a direction away from the communication structure; the first connecting part is formed by flanging a mounting hole on the mounting plate.
Preferably, the second welding part is arranged around the heat exchange tube, and seals between the flanging wall surface and the wall surface of the heat exchange tube.
Preferably, the first welding part is formed between the flange and the wall of the heat exchange tube.
Preferably, the length of the second welding part along the axial direction of the heat exchange tube is smaller than the length of the first welding part.
Preferably, the second welding part is formed by fusing part of the mounting plate and/or part of the heat exchange tube.
Preferably, the second welding portion is formed by laser welding the tube ends of the heat exchange tube.
Preferably, the third welded portion is formed by brazing, and a fourth welded portion is provided around the protruding portion, the fourth welded portion isolating the third welded portion from the flow passage.
Preferably, the fourth weld is formed by melting a portion of the cover plate and/or the mounting plate.
Preferably, the first welding part and/or the third welding part is/are made of different materials from the mounting plate and the heat exchange tube.
Preferably, the material of the isolation portion is different from the first welded portion and the third welded portion.
Preferably, the first welding portion and the third welding portion are made of non-stainless steel, and the isolating portion is made of stainless steel.
Preferably, the separator includes a waterproof coating applied to a surface of the first welded portion and/or the third welded portion exposed in the flow passage.
A gas water heating apparatus comprising: a stainless steel heat exchanger as claimed in any one of the preceding claims.
A manufacturing method of a heat exchanger comprises the following steps:
welding and sealing the outer wall of the heat exchange tube and the mounting part of the mounting plate to form a welding part;
an isolation part for isolating the welding part from water is arranged between the outer wall of the heat exchange tube and the mounting part.
Preferably, the isolation portion is formed prior to the welded portion.
Preferably, the temperature at which the welded portion is formed is lower than the melting points of the heat exchange tube and the mounting plate.
Preferably, the heat exchange tube and the mounting plate are made of stainless steel.
Preferably, a part of the heat exchange tube and/or a part of the mounting plate is melted to form the partition.
Preferably, the spacer is formed by laser welding or argon arc welding.
Preferably, the welding method for forming the welded portion is different from the welding method for forming the isolation portion.
Preferably, the mounting portion includes a mounting hole formed on the mounting plate; the manufacturing method of the heat exchanger comprises the following steps:
and forming the isolation part by laser welding the pipe end of the heat exchange pipe extending into the mounting hole.
Preferably, the welded portion is formed by brazing.
Preferably, the mounting hole is provided with a flange, and the brazing part is formed between the flange and the outer wall of the heat exchange tube so as to seal and connect the mounting plate with the heat exchange tube.
The beneficial effects are that:
according to the stainless steel heat exchanger provided by the application, the first welding part is isolated from the flow channel by the isolating part, so that the first welding part cannot be directly contacted with a heat exchange medium (preferably water) in the flow channel, and therefore, the first welding part cannot be corroded by the heat exchange medium, and therefore, the first welding part between the heat exchange pipe and the mounting plate can be effectively protected, and the service life is prolonged.
Meanwhile, the first welding part is isolated from the runner by the isolating part, and electrochemical corrosion cannot be formed even if the material of the first welding part is different from that of the mounting plate and the heat exchange tube, so that the first welding part cannot be corroded and damaged, and the service life of the welding part between the heat exchange tube and the mounting plate is effectively improved.
Specific embodiments of the application are disclosed in detail below with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the application are not limited in scope thereby. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic view of a stainless steel heat exchanger according to an embodiment of the present application;
FIG. 2 is a partially disassembled view of FIG. 1;
FIG. 3 is a schematic diagram of the spacer structure of FIG. 1;
fig. 4 is a schematic diagram of steps of a method for manufacturing a heat exchanger according to an embodiment of the present application.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, shall fall within the scope of the application.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Please refer to fig. 1 to 3. In an embodiment of the present application, there is provided a stainless steel heat exchanger 100 including: a mounting plate 3; a plurality of heat exchange tubes 4; the heat exchange tube 4 is fixedly connected with the mounting plate 3 through a first welding part 8; a communication structure having a communication space 6; the communication space 6 communicates the pipe ends of two or more heat exchange pipes 4 to form a flow passage; the communication structure is connected with the mounting plate 3 and/or the heat exchange tube 4; an isolation part; the spacer separates the first welded portion 8 from the flow passage.
The stainless steel heat exchanger 100 provided in this embodiment isolates the first welded portion 8 from the flow channel by providing the isolation portion, so that the first welded portion 8 cannot directly contact with the heat exchange medium (preferably water) in the flow channel, and thus the first welded portion 8 cannot be corroded by the heat exchange medium, and the first welded portion 8 between the heat exchange tube 4 and the mounting plate 3 can be effectively protected, and the service life is prolonged.
Meanwhile, the first welding part 8 is isolated from the flow passage by the isolating part, and even if the material of the first welding part 8 is different from that of the mounting plate 3 and the heat exchange tube 4, electrochemical corrosion cannot be formed, so that the first welding part 8 cannot be corroded and damaged, and the service life of a welding part between the heat exchange tube 4 and the mounting plate 3 is effectively improved.
In addition, the first welded portion 8 is isolated from the flow passage by the isolating portion, and even if the high-temperature flue gas remaining in the heat exchanger after the shutdown heats the water remaining in the heat exchange tube 4 to an excessively high temperature, the first welded portion 8 cannot be contacted with the water due to the isolating portion, and also cannot be corroded with acceleration.
In an embodiment, the isolation portion may be a coating structure, and the isolation portion may be disposed on the surface of the first welding portion 8 exposed to the flow channel, so as to avoid direct contact between the first welding portion 8 and the heat exchange medium in the flow channel. Preferably, the spacer is formed by laser welding or argon arc welding.
In the present embodiment, the second welded portion 7 formed by laser welding or argon arc welding isolates the welded portion formed by brazing from the water in the flow passage. Because the laser welding and the argon arc welding are the second welding part 7 formed after the melting of the base metal of the stainless steel heat exchanger, the second welding part 7 is basically consistent with the stainless steel heat exchanger, has stronger corrosion resistance, further avoids the corrosion damage problem caused by the direct contact of the first welding part 8 formed by brazing and water, and prolongs the service life of the heat exchanger.
Meanwhile, the heat exchange tube 4 is mainly connected with the mounting plate 3 through the first welding part 8, so that the requirement on the connection performance of the second welding part 7 is reduced, and only the second welding part 7 is required to isolate the first welding part 8 from the flow passage.
In the embodiment, the isolation portion may isolate the first welded portion 8 entirely from the flow passage, or may isolate a part of the first welded portion 8. Preferably, the spacer completely separates the first weld 8 from the flow path to ensure that the first weld 8 cannot contact water and cause corrosion. The isolation part and the first welding part 8 can be contacted, or not contacted, and only the isolation part can separate the first welding part 8 from the flow passage.
The separator may also be a water barrier in some embodiments, considering that the heat exchange medium typically employs water. The first welding part 8 is isolated from water in the flow passage by the water isolation part, so that the first welding part 8 is prevented from contacting with water. In a preferred embodiment, the spacer may sealingly connect the mounting plate 8 and the heat exchange tube 4 while completely isolating the first weld 8 from the flow passage.
In order to separate the first welded portion 8 from the flow channel, a spacer may be located at a side of the first welded portion 8 close to the flow channel, avoiding direct contact of the first welded portion 8 with the inside of the flow channel. As shown in fig. 3, the partition is located on the side of the first welded portion 8 near the communication structure.
In the embodiment shown in fig. 1 and 2, the mounting plate 3 is located at one side of the heat exchanger 100, and a plurality of heat exchange tubes 4 are mounted on the mounting plate 3 in parallel with each other. The outside of each mounting plate 3 is provided with the communication structure to connect a plurality of heat exchange tubes 4 in series to form a flow passage. The heat exchange tube 4 may have a circular tube shape, and may be provided with fins 9 to increase a heat exchange area. In the present embodiment, the heat exchange tube 4 heats the internal heat exchange medium (preferably water) by exchanging heat with the flue gas generated by the burner.
As shown in fig. 3, the mounting plate 3 is provided with a plurality of flanging holes 10, a plurality of heat exchange tubes 4 are arranged in parallel, and the tube ends of the heat exchange tubes 4 are inserted into the flanging holes 10. To isolate the first weld 8 from the flow channel, the isolation may be annular in shape, surrounding the tube ends of the heat exchange tube 4.
In this embodiment, the partition comprises a second weld 7 connecting the mounting plate 3 with the heat exchange tube 4. The second welding portion 7 is welded to the first welding portion 8 in a different manner to form a second welding portion 7 and a first welding portion 8 of different materials. As a preferred embodiment, the second welded portion 7 may be formed by laser welding or argon arc welding. The first welded portion 8 is formed by brazing. Specifically, the brazing solder is copper or nickel.
In this embodiment, the second welding part 7 formed by laser welding or argon arc welding isolates the brazing part from the water in the flow channel, and since the laser welding and the argon arc welding are the second welding part 7 formed by melting the base metal of the stainless steel heat exchanger, the second welding part 7 is basically consistent with the stainless steel heat exchanger, so that the risk of electrochemical corrosion is reduced, the corrosion resistance is high, the corrosion damage problem caused by direct contact between the first welding part 8 formed by brazing and water is avoided, and the service life of the heat exchanger is prolonged.
Meanwhile, the heat exchange tube 4 is mainly connected with the mounting plate 3 through the first welding part 8, so that the requirement on the connection performance of the second welding part 7 is reduced, and only the second welding part 7 is required to isolate the first welding part 8 from the flow passage.
In practice, the second welded portion 7 may be formed prior to the first welded portion 8 by laser welding or argon arc welding, and the heat exchange tube 4 may be positioned by fixing the heat exchange tube 4 to the mounting plate 3 with respect to the second welded portion 7. A space for filling with brazing solder is formed between the positioned heat exchange tube 4 and the mounting plate 3, and the filled solder (such as copper or nickel) forms a first welded portion 8.
In the embodiment, the mounting plate 3 has a first connection portion that is fitted over the heat exchange tube 4. The first welding part 8 connects the first connection part with the outer wall of the heat exchange tube 4. The second welded portion 7 is closer to the tube end of the heat exchange tube 4 than the first welded portion 8 to isolate the first welded portion 8 from the flow passage.
Specifically, the first connection portion extends in a direction away from the communication structure; the first connecting part is a flanging of a flanging hole 10 on the mounting plate 3. By means of which a fit gap can be formed between the flange and the tube end of the heat exchanger tube 4, which fit gap can be filled with solder for brazing to form the first weld 8.
Similar to the first welded portion 8, in this embodiment, the second welded portion 7 is disposed around the heat exchange tube 4 and seals between the burred wall surface and the wall surface of the heat exchange tube 4. Specifically, the first welding portion 8 is formed between the flange and the wall of the heat exchange tube 4. At the same time, the second welded portion 7 is closer to the communication space 6 than the first welded portion 8.
As shown in fig. 3, the second weld 7 is located in the fit-in gap between the flange and the heat exchanger tube 4. The first welding part 8 is positioned in the fit clearance to connect the heat exchange tube 4 with the flanging, and the heat exchange tube 4 is in sealing connection with the mounting plate 3. The second welded portion 7 is also connected to the heat exchange tube 4 by the flange, and may be formed prior to the first welded portion 8 to position the welding of the first welded portion 8. As shown in fig. 3, the length of the second welded portion 7 in the axial direction of the heat exchange tube 4 is smaller than the length of the first welded portion 8.
In the embodiment, the material of the second welded portion 7 may be the same as or different from the material of the mounting plate 3 and the heat exchange tube 4. In order to prevent the second welded portion 7 from being electrochemically corroded and to protect the second welded portion 7 from corrosion, the material of the second welded portion 7 is preferably stainless steel.
In order to avoid the electrochemical corrosion of the second welding portion 7, the second welding portion 7 is ensured not to be damaged, and the material of the second welding portion 7 can be the same as the material of the mounting plate 3 and the heat exchange tube 4. Specifically, the material of the second welding portion 7 may be stainless steel. The second welded portion 7 having stainless steel material has a better corrosion resistance. Further, the second welded portion 7 may be formed by melting a part of the mounting plate 3 and/or a part of the heat exchange tube 4.
In order to facilitate the formation of the second welded portion 7, when the second welded portion 7 is formed by welding, the second welded portion 7 may be formed by laser welding the tube ends of the heat exchange tube 4. Of course, the second welded portion 7 is not limited to being formed by the tube end of the heat exchange tube 4, and may be formed by laser welding the side wall of the heat exchange tube 4 or by laser welding the mounting plate 3.
The first welding part formed by brazing is isolated from water in the flow channel through the second welding part 7 formed by laser welding, and as the second welding part 7 formed by melting the base metal is formed by laser welding, the second welding part 7 is basically consistent with the stainless steel heat exchanger, so that the risk of electrochemical corrosion is reduced, the corrosion resistance is higher, the corrosion damage problem caused by direct contact of the brazing part and water is avoided, and the service life of the heat exchanger is prolonged.
In this embodiment, the communication structure may be mounted on the mounting plate 3, and the plurality of heat exchange tubes 4 may be communicated with each other through the communication space 6. The application does not limit the shape of the communication space 6, and only needs to communicate the pipe ends of the plurality of heat exchange pipes 4. The communication structure may be formed with a plurality of communication spaces 6, and the respective communication spaces 6 may be sealed from each other (not directly communicated).
Specifically, the periphery of each communication space 6 may be in sealing connection with the mounting plate 3, so that each communication space 6 remains independent, and thus, the plurality of heat exchange tubes 4 are connected in series to form a heat exchange flow channel. The communication structure may be mounted on the mounting plate 3 by bolting and sandwiching a gasket, or may be mounted by riveting or the like. Preferably, the communication structure may be connected to the mounting plate 3 and/or the heat exchange tube 4 by a third welded portion.
In the embodiment shown in fig. 1 and 2, the communication structure includes a cover plate 1 disposed on one side of the mounting plate 3. The cover plate 1 is provided with a protruding part 2 protruding along the direction away from the mounting plate 3 and a second connecting part positioned around the protruding part 2. The inside of the boss 2 forms the communication space 6. The second connecting portion is connected to the mounting plate 3 by the third welding portion to seal the periphery of the boss 2.
In this embodiment, the protrusion 2 of the communication structure may communicate two or more heat exchange tubes 4. As shown in fig. 2, in order to form a flow path by connecting a plurality of heat exchange tubes 4 in series, the tube ends of two heat exchange tubes 4 communicate with the inside (communication space 6) of one boss 2.
Specifically, the third welded portion may be formed by brazing. In order to avoid the third weld being destroyed by water corrosion, a fourth weld 5 may be provided around the boss 2. The fourth weld 5 isolates the third weld from the flow channel. Wherein the fourth weld 5 may be formed by melting a part of the cover plate 1 and/or the mounting plate 3.
In the embodiment, for ease of manufacturing and formation of a sealing structure between the heat exchange tube 4, the mounting plate 3, and the communication structure, the first welded portion 8, the third welded portion may be formed by brazing. The first welded portion 8 and/or the third welded portion are/is made of a material different from that of the mounting plate 3 and the heat exchange tube 4.
In the embodiment, the material of the isolation portion is different from the first welded portion 8 and the third welded portion. Specifically, the first welded portion 8 and the third welded portion are made of non-stainless steel materials, such as copper (including copper alloy) and nickel (including nickel alloy). The isolation part is made of stainless steel.
In an embodiment, the isolation portion is not limited to the above-described weld structure formed by welding, and in one example, the isolation portion may include a waterproof coating applied to a surface of the first welding portion 8 and/or the third welding portion exposed in the flow passage. The waterproof coating may be applied after the first weld 8 and/or the third weld is formed.
The embodiment of the application also provides a gas water heating device, which comprises: stainless steel heat exchanger 100 as described in any of the above. The gas water heating device can comprise, but is not limited to, a gas water heater and a wall-mounted boiler. Specifically, the gas water heating device may be provided with a burner (not shown), and the flue gas formed by the burner exchanges heat with the stainless steel heat exchanger 100 to heat water in the stainless steel heat exchanger 100.
The combustion portion and other portions (e.g., control portion and display portion) of the gas water heater according to the present embodiment may be any suitable conventional structure. For clarity and brevity, the technical solutions provided in the present embodiment will not be described in detail herein, and the drawings in the description are correspondingly simplified. It should be understood that the present embodiment is not limited in scope thereby.
As shown in fig. 4, the embodiment of the application further provides a manufacturing method of the heat exchanger. The method of manufacturing the heat exchanger may be used to manufacture, but is not limited to, the stainless steel heat exchanger 100 in any of the embodiments or examples described above. In this embodiment, the method for manufacturing the heat exchanger includes:
s1, welding and sealing the outer wall of the heat exchange tube 4 and the mounting part of the mounting plate 3 to form a welding part;
s2, an isolation part for isolating the welding part from water is arranged between the outer wall of the heat exchange tube 4 and the mounting part.
The steps S1 and S2 in the present embodiment are not limited in order of execution, and the step S1 may be executed before the step S2, that is, the welded portion is formed before the isolation portion. Step S2 may also be performed prior to step S1, i.e. the spacer is formed prior to the weld.
In step S1, the temperature at which the welded portion is formed is lower than the melting points of the heat exchange tube 4 and the mounting plate 3. The solder may be formed using a solder, which may be copper or nickel. Specifically, the welded portion is formed by brazing. Of course, the welded portion may also refer to the welded portion in the stainless steel heat exchanger 100 of the above embodiment, or the description of the first welded portion 8 and/or the third welded portion, which will not be repeated here.
In step S2, a part of the heat exchange tube 4 and/or a part of the mounting plate 3 are melted to form the partition. Specifically, the isolation portion is formed by laser welding or argon arc welding. Wherein the welding manner of forming the welding portion may be different from the welding manner of forming the isolation portion.
The mounting portion is a mounting hole formed in the mounting plate 3. Specifically, the mounting hole is a flanging hole 10, and the welding part formed by brazing is formed between the flanging of the flanging hole 10 and the outer wall of the heat exchange tube 4 so as to seal and connect the mounting plate 3 with the heat exchange tube 4.
In the step S2, the isolation portion is formed by laser welding the pipe end of the heat exchange pipe 4 extending into the mounting hole. The welding part formed by brazing is isolated from water in the flow channel through the isolating part formed by laser welding, and the isolating part formed by melting the base metal is basically consistent with the stainless steel heat exchanger, so that the isolating part has stronger corrosion resistance, further the corrosion damage problem caused by direct contact of the brazing part and water is avoided, and the service life of the heat exchanger is prolonged.
It should be noted that, in this embodiment, the description contents of the mounting plate 3, the welding portion, the mounting hole, and the isolation portion may be referred to by the mutual reference with the description contents of the mounting plate 3, the welding portion (the first welding portion 8 and/or the third welding portion), the mounting hole, and the isolation portion of the stainless steel heat exchanger 100 in the above embodiment, which are not described in detail herein.
Any numerical value recited herein includes all values of the lower and upper values that increment by one unit from the lower value to the upper value, as long as there is a spacing of at least two units between any lower value and any higher value. For example, if it is stated that the number of components or the value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, then the purpose is to explicitly list such values as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. in this specification as well. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be explicitly recited in this description, and all possible combinations of values recited between the lowest value and the highest value are believed to be explicitly stated in the description in a similar manner.
Unless otherwise indicated, all ranges include endpoints and all numbers between endpoints. "about" or "approximately" as used with a range is applicable to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the indicated endpoints.
All articles and references, including patent applications and publications, disclosed herein are incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not substantially affect the essential novel features of the combination. The use of the terms "comprises" or "comprising" to describe combinations of elements, components, or steps herein also contemplates embodiments consisting essentially of such elements, components, or steps. By using the term "may" herein, it is intended that any attribute described as "may" be included is optional.
Multiple elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, component, section or step is not intended to exclude other elements, components, sections or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the inventors regard such subject matter as not be considered to be part of the disclosed subject matter.
Claims (29)
1. A stainless steel heat exchanger, comprising:
a mounting plate;
a plurality of heat exchange tubes; the heat exchange tube is fixedly connected with the mounting plate through a first welding part;
a communication structure having a communication space; the communicating space communicates the pipe ends of two or more heat exchange pipes to form a flow passage; the communication structure is connected with the mounting plate and/or the heat exchange tube;
an isolation part; the isolation part isolates the first welding part from the flow channel, the isolation part comprises a second welding part which is used for connecting the mounting plate with the heat exchange tube, the second welding part is formed by melting part of the mounting plate and/or part of the heat exchange tube, and the isolation part is made of stainless steel.
2. The stainless steel heat exchanger of claim 1, wherein: the second welded portion is welded differently from the first welded portion.
3. The stainless steel heat exchanger of claim 2, wherein: the second welded portion is formed by laser welding or argon arc welding, and the first welded portion is formed by brazing.
4. A stainless steel heat exchanger according to claim 3, wherein: the brazing solder is copper or nickel.
5. The stainless steel heat exchanger of claim 1, wherein: the communication structure is connected with the mounting plate and/or the heat exchange tube through a third welding part.
6. A stainless steel heat exchanger according to claim 5, wherein: the communication structure comprises a cover plate arranged on one side of the mounting plate; the cover plate is provided with a protruding part protruding along the direction away from the mounting plate and a second connecting part positioned around the protruding part; the inside of the protruding part forms the communication space; the second connecting portion is connected with the mounting plate through the third welding portion to seal the periphery of the protruding portion.
7. A stainless steel heat exchanger according to claim 2 or 3 or 4, wherein: the mounting plate is provided with a first connecting part sleeved outside the heat exchange tube; the first welding part is used for connecting the first connecting part with the outer wall of the heat exchange tube; the second weld is closer to the tube end of the heat exchange tube than the first weld to isolate the first weld from the flow passage.
8. The stainless steel heat exchanger of claim 7, wherein: the first connecting portion extends in a direction away from the communication structure; the first connecting part is formed by flanging a mounting hole on the mounting plate.
9. The stainless steel heat exchanger of claim 8, wherein: the second welding part is arranged around the heat exchange tube and seals the gap between the flanging wall surface and the wall surface of the heat exchange tube.
10. The stainless steel heat exchanger of claim 9, wherein: the first welding part is formed between the flanging and the pipe wall of the heat exchange pipe.
11. The stainless steel heat exchanger of claim 10, wherein: the length of the second welding part along the axial direction of the heat exchange tube is smaller than that of the first welding part.
12. The stainless steel heat exchanger of claim 1, wherein: the second welding part is formed by laser welding the pipe ends of the heat exchange pipes.
13. The stainless steel heat exchanger of claim 6, wherein: the third welded portion is formed by brazing, a fourth welded portion is provided around the boss portion, and the fourth welded portion isolates the third welded portion from the flow passage.
14. The stainless steel heat exchanger according to claim 13, wherein: the fourth weld is formed by melting a portion of the cover plate and/or the mounting plate.
15. A stainless steel heat exchanger according to claim 5, wherein: the first welding part and/or the third welding part are/is different from the mounting plate and the heat exchange tube.
16. A stainless steel heat exchanger according to claim 5, wherein: the material of the isolation part is different from that of the first welding part and the third welding part.
17. The stainless steel heat exchanger according to claim 16, wherein: the first welding part and the third welding part are made of non-stainless steel materials.
18. A stainless steel heat exchanger according to claim 5, wherein: the isolation part comprises a waterproof coating coated on the surface of the first welding part and/or the third welding part exposed in the flow channel.
19. A gas water heating apparatus, comprising: a stainless steel heat exchanger according to any one of claims 1 to 18.
20. A method of manufacturing a stainless steel heat exchanger according to any one of claims 1 to 18, comprising:
welding and sealing the outer wall of the heat exchange tube and the mounting part of the mounting plate to form a welding part;
an isolation part for isolating the welding part from water is arranged between the outer wall of the heat exchange tube and the mounting part.
21. The method of manufacturing a heat exchanger of claim 20, wherein the separator is formed prior to the weld.
22. The method of manufacturing a heat exchanger according to claim 20, wherein the temperature at which the weld is formed is lower than the melting points of the heat exchange tube and the mounting plate.
23. The method of claim 20, wherein the heat exchange tube and the mounting plate are stainless steel.
24. The method of manufacturing a heat exchanger according to claim 20, wherein a part of the heat exchange tube and/or a part of the mounting plate is melted to form the partition.
25. The method of manufacturing a heat exchanger of claim 24, wherein the spacer is formed by laser welding or argon arc welding.
26. The method of manufacturing a heat exchanger according to claim 20, wherein a welding manner in which the welded portion is formed is different from a welding manner in which the separator is formed.
27. The method of manufacturing a heat exchanger according to claim 20, wherein the mounting portion includes a mounting hole formed in the mounting plate; the manufacturing method of the heat exchanger comprises the following steps:
and forming the isolation part by laser welding the pipe end of the heat exchange pipe extending into the mounting hole.
28. A method of manufacturing a heat exchanger according to any one of claims 20 to 27 wherein the weld is formed by brazing.
29. The method of manufacturing a heat exchanger according to claim 28, wherein the mounting hole is provided with a flange, and the brazing weld is formed between the flange and an outer wall of the heat exchange tube to seal-connect the mounting plate with the heat exchange tube.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310966337.7A CN117006865A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
| CN202310963473.0A CN117006864A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
| CN201810320306.3A CN108387000B (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
| PCT/CN2019/080056 WO2019196661A1 (en) | 2018-04-11 | 2019-03-28 | Stainless steel heat exchanger, gas water heater and manufacturing method of heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810320306.3A CN108387000B (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310963473.0A Division CN117006864A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
| CN202310966337.7A Division CN117006865A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
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| Publication Number | Publication Date |
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| CN108387000A CN108387000A (en) | 2018-08-10 |
| CN108387000B true CN108387000B (en) | 2023-09-22 |
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| CN202310966337.7A Pending CN117006865A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
| CN202310963473.0A Pending CN117006864A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
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| CN202310966337.7A Pending CN117006865A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
| CN202310963473.0A Pending CN117006864A (en) | 2018-04-11 | 2018-04-11 | Stainless steel heat exchanger, gas water heating device and manufacturing method of heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019196661A1 (en) * | 2018-04-11 | 2019-10-17 | 艾欧史密斯(中国)热水器有限公司 | Stainless steel heat exchanger, gas water heater and manufacturing method of heat exchanger |
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- 2018-04-11 CN CN201810320306.3A patent/CN108387000B/en active Active
- 2018-04-11 CN CN202310966337.7A patent/CN117006865A/en active Pending
- 2018-04-11 CN CN202310963473.0A patent/CN117006864A/en active Pending
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| WO1996006705A1 (en) * | 1994-09-01 | 1996-03-07 | Lars Persson | Heat exchanger and method for the manufacturing thereof |
| CN2448507Y (en) * | 2000-11-21 | 2001-09-19 | 张永林 | Protective coating for welding seam of stainless steel water tank |
| CN2608934Y (en) * | 2002-12-16 | 2004-03-31 | 张永胜 | Composite heat-exchanging pipe air cooler |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN117006865A (en) | 2023-11-07 |
| CN108387000A (en) | 2018-08-10 |
| CN117006864A (en) | 2023-11-07 |
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