CN117824414A - Titanium alloy double-tube-plate heat exchanger and connecting process of inner tube plate and outer tube plate - Google Patents
Titanium alloy double-tube-plate heat exchanger and connecting process of inner tube plate and outer tube plate Download PDFInfo
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- CN117824414A CN117824414A CN202410100890.7A CN202410100890A CN117824414A CN 117824414 A CN117824414 A CN 117824414A CN 202410100890 A CN202410100890 A CN 202410100890A CN 117824414 A CN117824414 A CN 117824414A
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- 238000000034 method Methods 0.000 title claims abstract description 89
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 36
- 238000003466 welding Methods 0.000 claims abstract description 168
- 238000010894 electron beam technology Methods 0.000 claims description 40
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 238000003754 machining Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 13
- 239000012530 fluid Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 3
- 230000003796 beauty Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention provides a titanium alloy double-tube plate heat exchanger and a connecting process of inner and outer tube plates, wherein the titanium alloy double-tube plate heat exchanger comprises an inner tube plate and an outer tube plate, a lock bottom boss is arranged at the left end of the inner tube plate, a connecting step is arranged at the right end of the outer tube plate, the inner end of the connecting step is abutted with the outer end of the lock bottom boss, the right end of the connecting step is abutted with the left end of the inner tube plate, the inner tube plate is provided with an inner tube hole, the outer tube plate is provided with an outer tube hole, and the inner tube hole and the outer tube hole are in one-to-one correspondence; the low deformation welding connection of the inner tube plate and the outer tube plate of the titanium alloy double tube plate heat exchanger is realized, the coaxiality and the perpendicularity of the inner tube plate and the outer tube plate are guaranteed, and then the connection form of the inner tube plate and the outer tube plate is made to be simple and reliable on the premise of meeting the requirements of tube penetrating and expansion connection of the subsequent heat exchange tubes, so that the pressure bearing capacity is improved, the structure is compact and the weight is reduced, and meanwhile, the cost is reduced.
Description
Technical Field
The invention relates to the technical field of heat exchanger manufacturing, in particular to a titanium alloy double-tube-plate heat exchanger and a connecting process of inner and outer tube plates.
Background
The heat exchanger is a device for transferring part of heat of hot fluid to cold fluid, is also called a heat exchanger, is widely applied to energy, chemical industry, power, pharmacy and other industrial production, and has a plurality of types, wherein one type of heat exchanger adopts a double-tube-plate structure, namely a double-tube-plate heat exchanger, each end of the heat exchange tube is connected with two tube plates, the inner tube plate close to a shell side is called an inner tube plate, the outer tube plate close to a tube side is called an outer tube plate, and the heat exchange tube and the two tube plates are connected by expansion joint or welding and expansion welding. A certain space is reserved between the inner tube plate and the outer tube plate of the double-tube plate heat exchanger, a drain hole is arranged, when leakage occurs at the joint of the heat exchange tube and one tube plate, leaked fluid is collected in the space and led out through the connecting tube or the drain hole, so that the shell side fluid and the tube side fluid are prevented from being mutually leaked in series and polluted, the double-tube plate heat exchanger is mainly used for the occasion that two fluids participating in heat exchange are strictly forbidden to be leaked in series, and the application is wider.
For a large double-tube-plate heat exchanger, the connection of the inner tube plate and the outer tube plate is usually achieved by adopting bolt connection, sealing gaskets such as aramid rubber and polytetrafluoroethylene are arranged between the two tube plates in the bolt connection, and then the two tube plates are connected through bolt fastening, so that the following defects exist in the connection mode: firstly, arranging a circle of bolt holes on a tube plate can lead to the increase of the diameter of the tube plate, and the increase of the structural weight, materials and processing cost, which is particularly obvious on a large-specification titanium alloy tube plate; the outer tube plate and the heat exchange tubes cannot be disassembled after being welded in an expansion joint sealing manner, so that gaskets clamped between the two tube plates are permanently and irreplaceable, potential safety hazards are brought to the heat exchanger if sealing failure at the gaskets is caused due to aging of the gaskets or other reasons, the two tube plates are welded together by adopting a conventional welding process, obvious deformation of the tube plates is usually caused, coaxiality and tube hole verticality of heat exchange tube holes densely distributed on the two tube plates are difficult to ensure, tube penetrating and expansion joint of the subsequent heat exchange tubes are influenced, and the inner tube plate and the outer tube plate of the double-tube plate heat exchanger are rarely connected in a welding manner in the industry.
Disclosure of Invention
In view of the above, the invention aims to provide a titanium alloy double-tube-plate heat exchanger and a connecting process of inner tube plates and outer tube plates so as to solve the problems of complex connecting structure and high cost of the inner tube plates and the outer tube plates in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the utility model provides a titanium alloy double tube plate heat exchanger, includes interior tube sheet and outer tube sheet, the left end of interior tube sheet is provided with the boss at the bottom of the lock, and the right-hand member of outer tube sheet is provided with the connection step, the inner of connection step and the outer butt of boss at the bottom of the lock, the right-hand member of connection step and the left end butt of interior tube sheet, interior tube sheet is provided with interior tube hole, and outer tube sheet is provided with outer tube hole, interior tube hole and outer tube hole one-to-one.
The utility model provides a titanium alloy double tube plate heat exchanger, through setting up boss and connection step at the bottom of the lock, be convenient for adopt vacuum electron beam or vacuum electron beam to add tungsten electrode argon arc welding combination welding's technology, realized the low deformation welded connection of interior tube sheet and outer tube sheet of titanium alloy double tube plate heat exchanger, the axiality and the straightness that hangs down in guaranteeing interior tube hole and outer tube hole, and then satisfy under the prerequisite of follow-up heat exchange tube poling and expansion joint, make the connected form of interior tube sheet and outer tube sheet become simple reliable, improved bearing capacity, compact structure has been realized moreover, the lightweight, the cost is reduced simultaneously.
The invention also provides a titanium alloy double-tube-plate heat exchanger and a connecting process of inner and outer tube plates, which are used for the titanium alloy double-tube-plate heat exchanger and comprise the following steps:
step 1: setting the depth of the lock bottom boss as H and the width as B, wherein H is more than or equal to 10mm and less than or equal to 30mm, B is more than or equal to 4mm and less than or equal to 6mm;
step 2: assembling and positioning the inner pipe plate and the outer pipe plate by using positioning pins to ensure concentricity of the inner pipe hole and the outer pipe hole;
step 3: and welding the inner tube plate and the outer tube plate together by adopting a vacuum electron beam, mechanically polishing and cleaning a welding seam after the welding is completed, and then performing capping welding on the welding seam by utilizing argon tungsten-arc welding.
The design structure of the lock bottom boss can introduce the root area which is easy to generate defects during electron beam welding into the lock bottom boss through the accurate control of welding process parameters, so that the inside of a welding line is guaranteed to be free of defects, the quality and the reliability of the welding line are further improved, meanwhile, the lock bottom boss can also block electron beam current, welding splashing caused after the electron beam current penetrates through the effective butt joint thickness of a tube plate is avoided, the inner tube plate surface and the tube hole are damaged, and further the subsequent tube penetrating and expansion joint are affected.
Further, in step 1, a second process boss is disposed at the outer end of the outer tube plate, a first process boss is disposed at the outer end of the inner tube plate, the left end of the first process boss is abutted with the right end of the second process boss, and the outer end of the first process boss is flush with the outer end of the second process boss.
The arrangement can introduce the defective forming defect close to the surface area into the first process boss and the second process boss during large-beam electron beam welding, and then remove the first process boss and the second process boss in a machining mode, so that the quality of a welding seam in a welding seam area is ensured, the comprehensive requirement on welding is reduced, and meanwhile, the welding heat input is reduced, so that smaller welding deformation is facilitated.
Further, the widths of the first process boss and the second process boss are W, the heights of the first process boss and the second process boss are T, W is more than or equal to 5mm and less than or equal to 8mm, and T is more than or equal to 5mm and less than or equal to 10mm.
The size structure of the process boss can be adjusted according to actual requirements, the titanium alloy double-tube-plate heat exchanger with different sizes and specifications is suitable for, and on the premise that poor forming defects close to surface areas during large-beam electron beam welding are guaranteed to be introduced into the first process boss and the second process boss, the first process boss and the second process boss which are as small as possible are adopted, so that the original blank sizes of an inner tube plate and an outer tube plate are reduced, and further the material cost and the subsequent processing cost are reduced.
Further, in step 2, when the inner pipe plate and the outer pipe plate are assembled, the assembly gap between the inner end of the connecting step and the outer end of the lock bottom boss is X 1 ，X 1 < 0.5; the outer circle assembly misalignment of the inner tube plate and the outer tube plate is X 2 ，X 2 < 0.5; the fit clearance between the right end of the connecting step and the left end of the inner tube plate is X 3 ，X 3 ＜0.2。
The arrangement can ensure the tight assembly between the inner tube plate and the outer tube plate, prevent loosening, improve the stability of connection, ensure the quality of the joint welded by the electron beam and the molding attractive appearance of the welding seam, and obtain the welding joint with high reliability and attractive molding.
Further, in the step 3, the vacuum electron beam welding includes three times of welding, the first time of positioning welding, the second time of fixing welding and the third time of finishing welding.
The first-pass welding beam is smaller and is used for fixing the inner tube plate and the outer tube plate, so that the inner tube plate and the outer tube plate are prevented from being misplaced during the subsequent large-beam fixed welding; the second pass welding beam is larger, and the butt joint needs to be completely penetrated, so that enough welding joint strength is obtained; the third welding beam is smaller, and meanwhile, the welding beam needs to swing forward to modify the welding seam which is formed poorly after fixed welding, so that the difficulty of subsequent mechanical grinding and argon tungsten-arc welding cover surface is reduced.
Further, in step 3, when the second process boss is disposed at the outer end of the outer tube plate, the first process boss is disposed at the outer end of the inner tube plate, and the vacuum electron beam welding is performed by two times of welding, the first time of positioning welding and the second time of fixing welding.
The arrangement reduces the number of times of electron beam welding, and simultaneously, after electron beam fixed welding, mechanical grinding and argon tungsten-arc welding cover surfaces are not needed, thereby reducing the comprehensive welding requirement and simplifying the welding procedure.
Further, after vacuum electron beam welding, the first process boss and the second process boss are cut off by machining.
The method can eliminate the surface defect of the welding seam after the electron beam fixing welding, improve the quality of the outer surfaces of the inner tube plate and the outer tube plate, and enable the outer surfaces of the inner tube plate and the outer tube plate to meet the process requirements.
Further, the main welding technological parameters of the vacuum electron beam welding are as follows: the accelerating voltage is 150KV, the welding beam current of the positioning welding is 5-30 mA, the welding beam current of the fixed welding is 50-120 mA, and the welding speed is 40-100 cm/min.
During positioning welding, accurate welding positioning can be realized by adopting smaller welding beam, dislocation of inner and outer tube plates during subsequent large beam fixed welding is prevented, and during fixed welding, enough heat can be provided by adopting larger welding beam, so that the welding seam is sufficiently melted and solidified, the welding firmness and sealing performance are ensured, the welding speed can control the heat input in the welding process, and welding defects are avoided.
Compared with the prior art, the titanium alloy double-tube-plate heat exchanger and the connecting process of the inner tube plate and the outer tube plate have the following advantages: the process of vacuum electron beam or vacuum electron beam and argon tungsten-arc welding combined welding is adopted, so that the low-deformation welding connection of the inner tube plate and the outer tube plate of the titanium alloy double-tube-plate heat exchanger is realized, and the connection form of the inner tube plate and the outer tube plate is simplified and reliable on the premise that the coaxiality and the verticality of the inner tube plate and the outer tube plate are ensured, and the subsequent heat exchange tube penetrating and expanding connection are further met, the pressure bearing capacity is improved, the structure is compact and light, and the cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the connection structure of the inner tube plate and the outer tube plate of the titanium alloy double tube plate heat exchanger according to the embodiment of the invention;
FIG. 2 is a schematic view of an inner and outer tube sheet connection structure of another titanium alloy double tube sheet heat exchanger according to an embodiment of the present invention;
FIG. 3 is a schematic view of a partial enlarged structure of FIG. 1A before welding;
fig. 4 is a schematic view of an assembly structure of an inner tube plate and an outer tube plate according to an embodiment of the present invention.
Reference numerals illustrate:
1. an inner tube sheet; 11. a lock bottom boss; 2. an outer tube sheet; 21. a connecting step; 31. an inner tube hole; 32. an outer tube hole; 41. a first process boss; 42. a second process boss; 100. and (3) welding seams.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Example 1
As shown in fig. 1-4, a titanium alloy double-tube-plate heat exchanger comprises an inner tube plate 1 and an outer tube plate 2, wherein a lock bottom boss 11 is arranged at the left end of the inner tube plate 1, a connecting step 21 is arranged at the right end of the outer tube plate 2, the inner end of the connecting step 21 is abutted with the outer end of the lock bottom boss 11, the right end of the connecting step 21 is abutted with the left end of the inner tube plate 1, an inner tube hole 31 is arranged on the inner tube plate 1, an outer tube hole 32 is arranged on the outer tube plate 2, and the inner tube holes 31 and the outer tube holes 32 are in one-to-one correspondence.
The utility model provides a titanium alloy double tube plate heat exchanger, through setting up boss 11 and connection step 21 at the bottom of the lock, be convenient for adopt vacuum electron beam or vacuum electron beam to add tungsten electrode argon arc welding combination welding's technology, realized the low deformation welded connection of titanium alloy double tube plate heat exchanger's inner tube board 1 and outer tube board 2, under guaranteeing axiality and straightness that hangs down of interior tube hole 31 and outer tube hole 32, and then satisfy follow-up heat exchange tube poling and expansion joint's the prerequisite, make the connected form of interior tube sheet 1 and outer tube board 2 become simple reliable, improved the bearing capacity, compact structure has been realized moreover, the lightweight, the cost is reduced simultaneously.
The invention also provides a titanium alloy double-tube-plate heat exchanger and a connecting process of inner and outer tube plates, which are used for the titanium alloy double-tube-plate heat exchanger and comprise the following steps:
step 1: setting the depth of the lock bottom boss 11 as H and the width as B, wherein H is more than or equal to 10mm and less than or equal to 30mm, B is more than or equal to 4mm and less than or equal to 6mm;
step 2: assembling and positioning the inner tube plate 1 and the outer tube plate 2 by using positioning pins to ensure that the inner tube holes 31 and the outer tube holes 32 are concentric;
step 3: and welding the inner tube plate 1 and the outer tube plate 2 together by adopting a vacuum electron beam, mechanically repairing and cleaning the welding seam 100 after the welding is completed, and then performing capping welding on the welding seam 100 by utilizing argon tungsten-arc welding.
Specifically, the design structure of the lock bottom boss 11 can introduce the root area which is easy to generate defects during electron beam welding into the lock bottom boss 11 through the accurate control of welding process parameters, so that the inside of the welding line 100 is guaranteed to be free of defects, and the quality and reliability of the welding line 100 are improved.
Preferably, in step 3, a cemented carbide grinding head is typically used for grinding.
As a preferred example of the present application, in step 1, a second process boss 42 is disposed at the outer end of the outer tube plate 2, a first process boss 41 is disposed at the outer end of the inner tube plate 1, the left end of the first process boss 41 abuts against the right end of the second process boss 42, and the outer end of the first process boss 41 is flush with the outer end of the second process boss 42.
Specifically, the arrangement can introduce the defective forming defect close to the surface area into the first process boss 41 and the second process boss 42 during large-beam electron beam welding, and then remove the first process boss 41 and the second process boss 42 in a machining mode, so that the quality of the welding seam 100 area is ensured, the welding can be completed without adopting a combined welding process, the comprehensive requirement on welding is reduced, the welding heat input is reduced, and smaller welding deformation is further facilitated.
As a preferred example of the present application, the first process boss 41 and the second process boss 42 have a width W, a height T, a width W is 5mm < 8mm, a width T is 5mm < 10mm.
Specifically, the size structure of the process boss can be adjusted according to actual requirements, the titanium alloy double-tube-plate heat exchanger with different sizes and specifications is suitable for, and on the premise that the defect of poor molding close to the surface area during large-beam electron beam welding is introduced into the first process boss 41 and the second process boss 42, the first process boss 41 and the second process boss 42 which are as small as possible are adopted, so that the original blank sizes of the inner tube plate 1 and the outer tube plate 2 are reduced, and further the material cost and the subsequent processing cost are reduced.
As a preferred example of the present application, in step 2, when assembling the inner tube plate 1 and the outer tube plate 2, the assembling gap between the inner end of the connecting step 21 and the outer end of the lock bottom boss 11 is X 1 ，X 1 < 0.5; the outer circle assembly misalignment of the inner tube plate 1 and the outer tube plate 2 is X 2 ，X 2 < 0.5; the fit clearance between the right end of the connecting step 21 and the left end of the inner tube plate 1 is X 3 ，X 3 ＜0.2。
In particular, the arrangement can ensure the tight assembly between the inner tube plate 1 and the outer tube plate 2, prevent loosening, improve the stability of connection, ensure the joint quality of electron beam welding and the molding beauty of the appearance of welding seams, and obtain a welding joint with high reliability and molding beauty.
As a preferred example of the present application, in step 3, the vacuum electron beam welding includes three times of welding, the first time of tack welding, the second time of fixing welding, and the third time of finish welding.
Specifically, the first-pass welding beam is smaller and is used for fixing the inner tube plate 1 and the outer tube plate 2, so that the dislocation of the inner tube plate and the outer tube plate during the subsequent large-beam fixed welding is prevented; the second pass welding beam is larger, and the butt joint needs to be completely penetrated, so that enough welding joint strength is obtained; the third welding beam is smaller and needs to swing forward at the same time, so that the welding seam 100 with poor molding after fixed welding is modified, and the difficulty of subsequent mechanical grinding and argon tungsten-arc welding cover surface is reduced.
As a preferred example of the present application, in step 3, when the second process boss 42 is disposed at the outer end of the outer tube plate 2, the first process boss 41 is disposed at the outer end of the inner tube plate 1, and the vacuum electron beam welding is adopted, two times of welding are included, the first time of tack welding and the second time of fixing welding are performed.
Specifically, the arrangement reduces the number of times of electron beam welding, and simultaneously, after electron beam fixed welding, mechanical grinding and argon tungsten-arc welding cover surfaces are not needed, thereby reducing the comprehensive welding requirement and simplifying the welding procedure.
As a preferred example of the present application, the first process boss 41 and the second process boss 42 are cut off by machining after vacuum electron beam welding is used.
Specifically, the method can eliminate the surface defect of the weld joint 100 after the electron beam fixing welding, improve the quality of the outer surfaces of the inner tube plate 1 and the outer tube plate 2, and enable the outer surfaces of the inner tube plate 1 and the outer tube plate 2 to meet the process requirements.
As a preferred example of the present application, the main welding process parameters of the vacuum electron beam welding are: the accelerating voltage is 150KV, the welding beam current of the positioning welding is 5-30 mA, the welding beam current of the fixed welding is 50-120 mA, and the welding speed is 40-100 cm/min.
Specifically, the high accelerating voltage is adopted to provide enough energy, so that the electron beam has enough penetrating power, the welding material can be effectively penetrated and melted, during the positioning welding, the small welding beam can be used for realizing accurate welding positioning, the dislocation of inner and outer tube plates during the subsequent large beam fixed welding is prevented, during the fixed welding, the large welding beam can be used for providing enough heat, the welding seam is fully melted and solidified, the welding firmness and the sealing performance are ensured, and the welding speed can control the heat input in the welding process, so that the welding defect is avoided.
The titanium alloy double-tube-plate heat exchanger and the connecting process of the inner tube plate and the outer tube plate have the following advantages: the process of vacuum electron beam or vacuum electron beam and argon tungsten-arc welding combined welding is adopted, so that the low-deformation welding connection of the inner tube plate 1 and the outer tube plate 2 of the titanium alloy double-tube-plate heat exchanger is realized, the coaxiality and the verticality of the inner tube hole 31 and the outer tube hole 32 are ensured, and the connection form of the inner tube plate 1 and the outer tube plate 2 is simplified and reliable on the premise of meeting the requirements of the subsequent heat exchange tube penetrating and expanding connection, the pressure bearing capacity is improved, the structure is compact and light, and the cost is reduced.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (9)
1. The utility model provides a titanium alloy double tube plate heat exchanger, its characterized in that, including interior tube sheet (1) and outer tube sheet (2), the left end of interior tube sheet (1) is provided with lock end boss (11), and the right-hand member of outer tube sheet (2) is provided with and connects step (21), the inner of connecting step (21) and the outer butt of lock end boss (11), the right-hand member of connecting step (21) and the left end butt of interior tube sheet (1), interior tube sheet (1) is provided with interior tube hole (31), and outer tube sheet (2) are provided with outer tube hole (32), interior tube hole (31) and outer tube hole (32) one-to-one.
2. A titanium alloy double-tube-plate heat exchanger and a connecting process of inner tube plates and outer tube plates, which are used for the titanium alloy double-tube-plate heat exchanger as claimed in claim 1, and are characterized by comprising:
step 1: setting the depth of the lock bottom boss (11) as H, the width as B, H being more than or equal to 10mm and less than or equal to 30mm, B being more than or equal to 4mm and less than or equal to 6mm;
step 2: assembling and positioning the inner tube plate (1) and the outer tube plate (2) by using positioning pins, so as to ensure that the inner tube hole (31) and the outer tube hole (32) are concentric;
step 3: and welding the inner tube plate (1) and the outer tube plate (2) together by adopting a vacuum electron beam, mechanically polishing and cleaning the welding seam (100) after the welding is finished, and then performing capping welding on the welding seam (100) by utilizing argon tungsten-arc welding.
3. The titanium alloy double-tube-plate heat exchanger and the connecting process of the inner tube plate and the outer tube plate according to claim 2, wherein in the step 1, a second process boss (42) is arranged at the outer end of the outer tube plate (2), a first process boss (41) is arranged at the outer end of the inner tube plate (1), the left end of the first process boss (41) is abutted with the right end of the second process boss (42), and the outer end of the first process boss (41) is flush with the outer end of the second process boss (42).
4. A titanium alloy double-tube-plate heat exchanger and a connecting process of inner and outer tube plates according to claim 3, wherein the widths of the first process boss (41) and the second process boss (42) are W, the heights are T, W is more than or equal to 5mm and less than or equal to 8mm, and T is more than or equal to 5mm and less than or equal to 10mm.
5. The titanium alloy double tube plate heat exchanger and the connection process of the inner tube plate and the outer tube plate according to claim 2, wherein in the step 2, when the inner tube plate (1) and the outer tube plate (2) are assembled, an assembly gap between the inner end of the connecting step (21) and the outer end of the lock bottom boss (11) is X 1 ，X 1 < 0.5; the outer circle assembly misalignment of the inner tube plate (1) and the outer tube plate (2) is X 2 ，X 2 < 0.5; the fit clearance between the right end of the connecting step (21) and the left end of the inner tube plate (1) is X 3 ，X 3 ＜0.2。
6. The process for connecting the titanium alloy double-tube-plate heat exchanger and the inner tube-plate and the outer tube-plate according to claim 2, wherein in the step 3, the vacuum electron beam welding comprises three times of welding, wherein the first time of positioning welding, the second time of fixing welding and the third time of finishing welding.
7. The process for connecting the inner tube plate and the outer tube plate of the titanium alloy double tube plate heat exchanger according to claim 3, wherein in the step 3, the vacuum electron beam welding comprises two times of welding, wherein the first time is the positioning welding, and the second time is the fixing welding.
8. The process for connecting the inner and outer tube plates and the titanium alloy double tube plate heat exchanger according to claim 7, wherein the first process boss (41) and the second process boss (42) are cut off by machining after vacuum electron beam welding.
9. The titanium alloy double-tube-plate heat exchanger and the connecting process of the inner tube plate and the outer tube plate according to claim 7, wherein the main welding process parameters of the vacuum electron beam welding are as follows: the accelerating voltage is 150KV, the welding beam current of the positioning welding is 5-30 mA, the welding beam current of the fixed welding is 50-120 mA, and the welding speed is 40-100 cm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410100890.7A CN117824414A (en) | 2024-01-25 | 2024-01-25 | Titanium alloy double-tube-plate heat exchanger and connecting process of inner tube plate and outer tube plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410100890.7A CN117824414A (en) | 2024-01-25 | 2024-01-25 | Titanium alloy double-tube-plate heat exchanger and connecting process of inner tube plate and outer tube plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117824414A true CN117824414A (en) | 2024-04-05 |
Family
ID=90509820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410100890.7A Pending CN117824414A (en) | 2024-01-25 | 2024-01-25 | Titanium alloy double-tube-plate heat exchanger and connecting process of inner tube plate and outer tube plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117824414A (en) |
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2024
- 2024-01-25 CN CN202410100890.7A patent/CN117824414A/en active Pending
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