CN117367174A - Plugging strip and plate bundle for welded plate heat exchanger and processing method - Google Patents
Plugging strip and plate bundle for welded plate heat exchanger and processing method Download PDFInfo
- Publication number
- CN117367174A CN117367174A CN202311350294.6A CN202311350294A CN117367174A CN 117367174 A CN117367174 A CN 117367174A CN 202311350294 A CN202311350294 A CN 202311350294A CN 117367174 A CN117367174 A CN 117367174A
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- Prior art keywords
- plate
- welded
- strip
- cold fluid
- heat exchanger
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- 238000003672 processing method Methods 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000010622 cold drawing Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 65
- 238000003466 welding Methods 0.000 claims description 26
- 230000000903 blocking effect Effects 0.000 claims description 15
- 238000003754 machining Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000002161 passivation Methods 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 4
- 238000005457 optimization Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
-
- 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)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a plugging strip, a plate bundle and a processing method for a welded plate heat exchanger. The plugging strip is a pentagonal prism formed by cold drawing of a die, the plugging strip is small in deformation, simple to process and low in cost, the thickness of the plugging strip can be customized according to the requirements of working conditions, the phenomenon that the plate heat exchanger is torn and leaked due to the fact that the plugging strip is too thin is avoided, the accommodating cavity with the pentagonal cross section can be well filled by the plugging strip in the shape of the pentagon, the leakage flow phenomenon is reduced, and the heat exchange efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of welded plate heat exchangers, and particularly relates to a plugging strip, a plate bundle and a processing method for a welded plate heat exchanger.
Background
In a welded plate heat exchanger comprising a plate bundle, a clamping plate and clamping bolts, wherein the plate bundle comprises a plurality of concave-convex plates formed by stamping, the concave-convex lines between the adjacent plates are combined in 180 degrees, so that the concave-convex ridge lines between the adjacent plates in the plate bundle form staggered contact points, the first contact surfaces at two ends between the adjacent plates are seam welded to form plate pairs for heat supply fluid circulation, the adjacent plate pairs are welded through the second contact surfaces at the other two ends of the plates, a containing cavity with pentagonal cross section is formed between the first contact surfaces of the plate pairs after welding, the containing cavity is filled with plugging strips, the rear ends of the plugging strips are welded with the ends of the adjacent plate pairs, and cold fluid inlets and cold fluid outlets are formed on the plugging strips at each opposite side, so that cold fluid circulation channels are formed between the adjacent plate pairs, and the cold fluid and the hot fluid in the plate heat exchanger generate strong turbulence through the staggered cold and hot fluid circulation channels, thereby achieving the effect of high-efficiency heat exchange.
As shown in fig. 8, the conventional plugging bar is a rectangular parallelepiped thin plate machined, and has the following problems:
1. the machining is divided into cold machining and hot machining, when the sheet is cold machined, the blocking strips cannot deform, but the problems of time consumption, high machining difficulty, high cost and the like exist, when the sheet is hot machined, the sheet can deform due to thermal expansion, so that the utilization rate of materials is reduced, and the difficulty is improved for later assembly.
2. Because current blanking strip is the sheet metal, when the operating mode of high pressure, owing to the welding surplus height of blanking strip is lower to lead to plate heat exchanger to produce tearing and take place to reveal, if with the blanking strip thickening of cuboid shape, can lead to the surface roughness of blanking strip big in machining's in-process, therefore need add a process more and reduce roughness, just can reduce the assembly degree of difficulty and follow-up and the welding degree of difficulty between the slab pair.
3. As shown in fig. 9, since the plate 7 is a concave-convex plate formed by stamping, a receiving cavity 8 with a pentagonal cross section is formed between the first contact surfaces of the adjacent plate pairs 6, when a rectangular parallelepiped-shaped blocking strip 10 is welded in the receiving cavity 8, a large gap 11 is left between the rectangular parallelepiped-shaped blocking strip 10 and the receiving cavity 8, and as shown in fig. 10, when cold fluid flows into the plate bundle from the cold fluid inlet 1-1, a part of the cold fluid flows downward through the gap 11 and then flows out from the cold fluid outlet 1-2, so that a leakage flow phenomenon is generated, thereby reducing heat exchange efficiency.
4. Because the existing blocking strip is in a cuboid shape, the edges and corners of the blocking strip are relatively sharp, and passivation films on the plate are easy to scratch when the blocking strip is assembled with the plate pair, so that the corrosion resistance of the plate is reduced.
Disclosure of Invention
The invention aims to solve the problems and provide a plugging strip, a plate bundle and a processing method for welding a plate heat exchanger, wherein the plugging strip is a pentagonal prism formed by cold drawing through a die, the plugging strip formed by cold drawing has small deformation, simple processing and low cost, the thickness of the plugging strip can be customized according to the requirements of working conditions, the phenomenon that the plate heat exchanger is torn and leaked due to the fact that the plugging strip is too thin is avoided, and the accommodating cavity with the pentagonal cross section can be well filled by the plugging strip in the shape of the pentagonal cross section, so that the leakage flow phenomenon is reduced, and the heat exchange efficiency is improved.
In order to achieve the above object, the present invention provides a plugging strip for a welded plate heat exchanger, wherein the plugging strip is manufactured by a cold drawing molding process through a die, and the plugging strip has a pentagonal prism shape similar to the size and shape of a receiving cavity between adjacent plate pairs.
As further optimization, the five edges of the plugging strip adopt rounded corner transition.
As a further optimization, the apex angle of the plugging strip is 20-160 degrees.
A plate bundle for welding plate heat exchangers comprises plate pairs, blocking strips with any one of the structures, lining plates, plate end tube boxes and plate side tube boxes.
A method of machining a plate bundle for welding a plate heat exchanger, comprising the steps of:
s1, welding a plate pair: the two plates are oppositely combined at 180 degrees, and the first contact surfaces at the two ends of the two plates are welded in a seam mode to form a hot fluid channel through which a heating fluid flows;
s2, welding a plurality of plate pairs: the plurality of plate pairs are welded through second contact surfaces at the other two ends of the adjacent plates, and a containing cavity with a pentagonal cross section is formed between the first contact surfaces of the adjacent plate pairs after welding;
s3, welding a plate group: the back end of the plugging strip is welded with the end parts of the adjacent plate pairs, and a cold fluid inlet and a cold fluid outlet are arranged on the plugging strip on each opposite side, so that a cold fluid channel for cold fluid circulation is formed between the adjacent plate pairs, and then lining plates are welded on the plate pairs at the outermost two ends, thereby completing the assembly of the plate group;
s4, assembling the plate bundle: the ends of the second contact surfaces at two ends of the plate group are welded with plate end pipe boxes, the plate side pipe boxes are welded at the positions of the other two ends of the plate group, which are opposite to the cold fluid inlet and the cold fluid outlet, the plate end pipe boxes are a hot fluid inlet and a hot fluid outlet, and the plate side pipe boxes are a cold fluid inlet and a cold fluid outlet.
Advantages and beneficial effects of the invention
1. The plugging strip is manufactured by taking round steel and the like as raw materials through a cold-drawing forming process by a die, the deformation of the plugging strip manufactured and formed through the cold-drawing forming process is small, the material utilization rate is high, the processing is simple, the time consuming time is short, the cost is low, the surface roughness of the plugging strip after cold-drawing forming is small, the assembly difficulty and the subsequent welding difficulty of a sheet pair are reduced, and the precision of the installation and the matching of the sheet pair is improved.
2. The thickness of the blocking strip can be customized according to the requirements of working conditions, and when the blocking strip is welded with the adjacent plate pairs, the welding residual height is higher, and the blocking strip has higher pressure bearing capacity and high-temperature heat deformation resistance, so that the phenomenon that the plate heat exchanger is torn and leaks is reduced.
3. The shape of the plugging strip is a pentagonal prism shape which is similar to the size and shape of the containing cavity, so that the gap between the plugging strip and the containing cavity is small, cold fluid flows through a cold fluid channel formed by concave-convex lines between adjacent plate pairs after flowing into the plate bundles from the cold fluid inlet, and then flows out from the cold fluid outlet, thereby reducing the phenomenon of leakage flow and further increasing the heat exchange efficiency of the plate heat exchanger.
4. The shape of the blocking strip is a pentagonal prism shape which is similar to the size and the shape of the containing cavity, so that when the blocking strip is assembled with the plate pair, the passivation film on the plate pair can be prevented from being scratched, and the five edges and corners of the blocking strip are all rounded corners for transition, so that the passivation film can be further prevented from being scratched when the blocking strip is assembled with the plate pair.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present invention, and other drawings may be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a plugging strip provided by the invention;
FIG. 2 is a schematic view of the overall structure of a plate bundle according to the present invention;
FIG. 3 is an exploded view of a plate bundle provided by the present invention;
FIG. 4 is a schematic view of a plate package comprising a plurality of plate pairs and plugs according to the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4A provided by the present invention;
FIG. 6 is a schematic view of the structure of a plate pair provided by the present invention;
FIG. 7 is a schematic illustration of the plate decomposition provided by the present invention;
FIG. 8 is a schematic view of the overall structure of a prior art plugging strip;
FIG. 9 is an enlarged view of a prior art plate stack formed of a plurality of plate pairs and plugs;
fig. 10 is a schematic diagram of the flow of cold fluid after filling a containment chamber with a prior art plug.
Reference numerals: the device comprises a plugging strip 1, a cold fluid inlet 1-1, a cold fluid outlet 1-2, a plate bundle 2, a plate group 3, a plate end pipe box 4, a plate side pipe box 5, a plate pair 6, a plate 7, a first contact surface 7-1, a second contact surface 7-2, a containing cavity 8, a lining plate 9, a cuboid plugging strip 10, a gap 11, a cold fluid channel 12 and a hot fluid channel 13.
Detailed Description
In the following detailed description of the present invention with reference to the drawings, it should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
A kind of blanking strip used for welding the plate heat exchanger, said blanking strip is to regard round steel, etc. as raw materials and adopt the cold-drawing shaping process to make through the mould, and can customize the thickness of the blanking strip according to the demand of the working condition, make fashioned blanking strip deflection little through the cold-drawing shaping process, even if thicken the thickness of the blanking strip according to the working condition demand, its surface roughness is also low, have avoided the existing thickening blanking strip to make its surface roughness great because of the machining, need to increase the problem that a process reduces the roughness additionally, have reduced assembly difficulty and subsequent welding difficulty with the slab pair, has improved and slab pair installation complex precision. And when welding with adjacent slab pair, because the thickness of stifled strip is according to the demand customization of operating mode, so the surplus height of welding of stifled strip and slab pair is higher, has higher bearing capacity and high temperature resistant heat deformation ability, has reduced the phenomenon that the plate heat exchanger produced tearing and has taken place to reveal.
As shown in fig. 1 and 5, the plugging strip 1 is in a pentagonal prism shape similar to the size and shape of the accommodating cavity 8 between the adjacent plate pairs 6, specifically, the angle formed by the top angle of the plugging strip 1 and the end of the adjacent plate pairs 6 is 20 ° -160 °, and the width, thickness and length of the plugging strip 1 are similar to the width, thickness and length of the accommodating cavity 5, so that the gap between the plugging strip 1 and the accommodating cavity 8 is small, when cold fluid flows into the plate bundle 2 from the cold fluid inlet 1-1, the cold fluid flows upwards from the bottom through the cold fluid channel 12 formed by the concave-convex lines between the adjacent plate pairs 6, and then flows out from the cold fluid outlet 1-2, thus reducing the leakage flow phenomenon, thereby increasing the heat exchange efficiency of the plate heat exchanger, and the plugging strip 1 in the pentagonal prism shape is similar to the shape of the accommodating cavity 8, so that when assembled with the plate pairs 6, scratches on the passivation film on the plate pairs 6 can be avoided.
As a further optimization, the five edges of the plugging strip 1 adopt rounded transition, so that the passivation film can be further prevented from being scratched when being installed with the plate pair 6.
As shown in fig. 2 and 3, a plate package 2 for a welded plate heat exchanger comprises plate pairs 6, the blanking strips 1 according to any of the preceding claims, a lining plate 9, a plate end header 4 and a plate side header 5.
A method of machining a plate bundle for welding a plate heat exchanger, comprising the steps of:
s1, welding a plate pair 6: the two plates 7 are oppositely combined at 180 degrees, and the first contact surfaces 7-1 at the two ends of the two plates 7 are seam welded to form a hot fluid channel 13 (see fig. 6 and 7) for circulating a hot fluid;
s2, welding a plurality of plate pairs 6: the plurality of plate pairs 6 are welded through second contact surfaces 7-2 at the other two ends of the adjacent plates 7, and a containing cavity 8 with pentagonal cross section is formed between the first contact surfaces 7-1 of the plurality of plate pairs 6 after welding;
s3, welding a plate group 3: the accommodating cavity 8 is filled with any one of the above-mentioned plugging strips 1, the rear ends of the plugging strips 1 are welded with the end parts of the adjacent plate pairs 6, and each opposite side of the plugging strip 1 is provided with a cold fluid inlet 1-1 and a cold fluid outlet 1-2, so that a cold fluid channel 12 for cold fluid circulation is formed between the adjacent plate pairs 6, and then a lining plate 9 is welded on the plate pairs 6 at the outermost two ends, so that the assembly of the plate group 3 is completed (see fig. 4-6);
s4, assembling the plate bundle 2: the ends of the second contact surfaces 7-2 at the two ends of the plate group 3 are welded with plate end pipe boxes 4, the other two ends of the plate group 3 are welded with plate side pipe boxes 5 at positions corresponding to the cold fluid inlets 1-1 and the cold fluid outlets 1-2, the plate end pipe boxes 4 are a hot fluid inlet and a hot fluid outlet, the plate side pipe boxes 5 are a cold fluid inlet and a cold fluid outlet (see fig. 2 and 3), the hot fluid enters the hot fluid channels 13 in the plate pairs 6 through the plate end pipe boxes 4 at the top end, flows out from the plate end pipe boxes 4 at the bottom end, the cold fluid enters the cold fluid channels 12 formed between the adjacent plate pairs 6 through the plate side pipe boxes 5 at the lower side, and flows out from the plate side pipe boxes 5 at the upper side, so that heat exchange is completed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions.
Claims (5)
1. A plugging strip for welded plate heat exchangers, characterized in that: the plugging strip is manufactured by a cold drawing forming process through a die, and is in a pentagonal prism shape which is similar to the size and the shape of the accommodating cavity between the adjacent plate pairs.
2. A blanking strip for a welded plate heat exchanger according to claim 1, characterized in that: five edges of the blocking strip adopt fillet transition.
3. A blanking strip for a welded plate heat exchanger according to claim 1, characterized in that: the apex angle of the plugging strip is 20-160 degrees.
4. A plate bundle for welding plate heat exchanger includes slab pair, stifled strip, welt, board end pipe case and board side pipe case, its characterized in that: the plug strip is a plug strip for a welded plate heat exchanger according to any one of claims 1-3.
5. A method of machining a plate package for use in a welded plate heat exchanger, comprising the steps of:
s1, welding a plate pair: the two plates are oppositely combined at 180 degrees, and the first contact surfaces at the two ends of the two plates are welded in a seam mode to form a hot fluid channel through which a heating fluid flows;
s2, welding a plurality of plate pairs: the plurality of plate pairs are welded through second contact surfaces at the other two ends of the adjacent plates, and a containing cavity with a pentagonal cross section is formed between the first contact surfaces of the plurality of plate pairs after welding;
s3, welding a plate group: the back ends of the plugging strips are welded with the end parts of the adjacent plate pairs, and cold fluid inlets and cold fluid outlets are formed in the plugging strips on each opposite side, so that cold fluid channels for cold fluid circulation are formed between the adjacent plate pairs, and lining plates are welded on the plate pairs at the outermost two ends, so that the assembly of the plate group is completed;
s4, assembling the plate bundle: and the plate end pipe boxes are welded at the end parts of the second contact surfaces at the two ends of the plate group, plate side pipe boxes are welded at the positions of the other two ends of the plate group, which are opposite to the cold fluid inlet and the cold fluid outlet, the plate end pipe boxes are a hot fluid inlet and a hot fluid outlet, and the plate side pipe boxes are a cold fluid inlet and a cold fluid outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311350294.6A CN117367174A (en) | 2023-10-18 | 2023-10-18 | Plugging strip and plate bundle for welded plate heat exchanger and processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311350294.6A CN117367174A (en) | 2023-10-18 | 2023-10-18 | Plugging strip and plate bundle for welded plate heat exchanger and processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117367174A true CN117367174A (en) | 2024-01-09 |
Family
ID=89401879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311350294.6A Pending CN117367174A (en) | 2023-10-18 | 2023-10-18 | Plugging strip and plate bundle for welded plate heat exchanger and processing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117367174A (en) |
-
2023
- 2023-10-18 CN CN202311350294.6A patent/CN117367174A/en active Pending
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