CN114669673A - Hydraulic expansion joint method and expansion joint for heat exchange tube and tube plate - Google Patents
Hydraulic expansion joint method and expansion joint for heat exchange tube and tube plate Download PDFInfo
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- CN114669673A CN114669673A CN202210251037.6A CN202210251037A CN114669673A CN 114669673 A CN114669673 A CN 114669673A CN 202210251037 A CN202210251037 A CN 202210251037A CN 114669673 A CN114669673 A CN 114669673A
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- Prior art keywords
- tube
- heat exchange
- expansion
- pipe
- hole
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/06—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes in openings, e.g. rolling-in
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
The embodiment of the invention provides a hydraulic expansion joint method and an expansion joint for a heat exchange tube and a tube plate, wherein the method comprises the following steps: s1, processing a tube plate according to a preset tube plate requirement, and turning out a tube hole on the tube plate; s2, arranging an expansion groove at a preset position of the inner wall of the pipe hole, wherein the groove width of the expansion groove is 8mm or 9 mm; s3, forming pipe hole chamfers on two sides in two ends of the pipe hole; s4, arranging a heat exchange pipe chamfer at the intersection end part of the heat exchange pipe and the pipe hole, and removing end part burrs; s5, cleaning the inner and outer surfaces of the pipe hole and the heat exchange pipe, and assembling the heat exchange pipe and the pipe plate; s6, selecting a corresponding tube expander according to the thickness of the tube plate and the inner diameter of the heat exchange tube, and confirming that the expansion joint equipment is intact and can normally work; and S7, selecting corresponding hydraulic expansion force to perform hydraulic expansion joint one by one. The invention can improve the sealing performance and the shearing performance of the expansion joint of the heat exchange tube and the tube plate.
Description
Technical Field
The invention relates to the technical field of expansion joint, in particular to a hydraulic expansion joint method and an expansion joint for a heat exchange tube and a tube plate.
Background
An expansion joint of a heat exchange tube and a tube plate in heat exchanger equipment is usually subjected to strength expansion joint in order to meet the design requirements of axial (pulling or pressing) machinery and temperature difference load of the heat exchange tube and ensure the sealing performance; when vibration or cyclic load exists, a seam corrosion tendency exists, and when the composite tube plate is adopted, a connection mode of expansion welding and the like is adopted. Mechanical expansion belongs to hard rolling, the efficiency is relatively low, and the heat exchange pipe body is damaged to a certain extent and the wall thickness is reduced; the mechanical strength expand tube hole grooving width is 3mm, and the dissection piece shows that the outer wall of the heat exchange tube can not or only a few parts of the outer wall of the heat exchange tube can be squeezed into the groove within the qualified expansion degree range, so that the obtained expansion joint of the heat exchange tube and the tube plate is poor in sealing performance and shearing performance.
Disclosure of Invention
The embodiment of the invention provides a hydraulic expansion joint method for a heat exchange tube and a tube plate, which aims to solve the problem that an expansion joint of the heat exchange tube and the tube plate obtained by the conventional expansion joint method has poor sealing performance and shearing performance.
The embodiment of the invention provides a hydraulic expansion joint method of a heat exchange tube and a tube plate, which comprises the following steps:
s1, processing a tube plate according to a preset tube plate requirement, and turning out a tube hole on the tube plate;
S2, arranging expansion slots at preset positions of the inner walls of the pipe holes, wherein the slot widths of the expansion slots are 8mm or 9 mm;
s3, forming pipe hole chamfers on two sides in two ends of the pipe hole;
s4, arranging a heat exchange pipe chamfer at the intersection end part of the heat exchange pipe and the pipe hole, and removing end part burrs;
s5, cleaning the inner and outer surfaces of the pipe hole and the heat exchange pipe, and assembling the heat exchange pipe and the pipe plate;
s6, selecting a corresponding tube expander according to the thickness of the tube plate and the inner diameter of the heat exchange tube, and confirming that the expansion joint equipment is intact and can normally work;
and S7, selecting corresponding hydraulic expansion force to perform hydraulic expansion joint one by one.
Preferably, in S2, the number of the expansion slots is one or two, and the preset positions are: the first expansion groove is arranged 11mm away from the tube side tube plate surface, and the groove distance between the two expansion grooves is 6 mm.
Preferably, the groove width of the expansion groove is 8mm or 9mm, and the groove depth of the expansion groove is 0.5 mm.
Preferably, in S3, the pipe hole is chamfered at an angle of 1 × 30 °.
Preferably, in S4, the heat exchange tube is chamfered at an angle of 0.5 × 45 °.
The embodiment of the invention also provides an expansion joint of the heat exchange tube and the tube plate, which is formed by expansion joint of the heat exchange tube and the tube plate by the hydraulic expansion joint method of the embodiment, and comprises the following steps: the heat exchange tube penetrates through the tube hole and is hydraulically expanded and connected through the expansion groove to form an integral structure.
Preferably, the groove width of the expansion groove is 8mm or 9mm, and the groove depth of the expansion groove is 0.5 mm.
Preferably, pipe hole chamfers with angles of 1 × 30 ° are arranged on two sides of the pipe hole.
Preferably, the intersection end position of the heat exchange tube and the tube hole is provided with a heat exchange tube chamfer with an angle of 0.5 multiplied by 45 degrees.
Preferably, the number of the expansion slots is one or two.
The invention has the following beneficial effects:
the invention designates hydraulic expansion joint, and the groove width of the expansion groove is set to be 8mm or 9 mm. The hydraulic expansion joint belongs to flexible expansion joint, and the heat exchange pipe can be prevented from being damaged and thinned due to the fact that pressure is uniformly applied to the heat exchange pipe. The invention has simple operation, stability and high efficiency, each pipe only needs several seconds, and each pipe is clean without cleaning after expansion joint, and the expansion joint with good sealing performance and shearing performance can be obtained while greatly reducing labor intensity and improving production efficiency.
Drawings
Fig. 1 is a flow chart of a hydraulic expansion joint method for a heat exchange tube and a tube plate according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an expansion joint of a heat exchange tube and a tube plate according to an embodiment of the present invention.
The heat exchange tube comprises a tube plate 1, a tube plate 2, a heat exchange tube 3, an expansion groove 4 and a heat exchange tube chamfer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The invention will be further illustrated and described with reference to examples of embodiments of the invention.
Example one
As shown in fig. 1, fig. 1 is a flowchart of a method for hydraulically expanding a heat exchange tube and a tube plate according to an embodiment of the present invention. The hydraulic expansion joint method of the heat exchange tube and the tube plate comprises the following steps:
s1, machining the tube plate according to the requirement of a preset tube plate, and turning out tube holes on the tube plate.
Wherein, the preset pipe plate requirement can be a pre-designed drawing requirement. In the embodiment of the invention, the specification of the heat exchange tube can be phi 19 and phi 25. In the specific embodiment, a heat exchange tube with a diameter of 25 is mainly taken as an example for explanation.
Specifically, the large plane, the outer circle and the sealing surface of the tube plate are machined according to a pre-designed drawing, the tube plate is transferred to a numerical control drilling machine, and a unthreaded hole with the diameter of 25.25 mm +/-0.10 mm is drilled according to the drawing.
S2, arranging expansion grooves in preset positions of the inner walls of the pipe holes, wherein the groove widths of the expansion grooves are 8mm or 9 mm.
Wherein, the quantity of expansion tank is one or two, and the preset position is: the first expansion groove is formed at the position 11mm away from the tube side tube plate surface, and the groove distance between the two expansion grooves is 6 mm. The groove depth of the expansion groove is 0.5 mm.
Specifically, the first groove is processed at a position 11mm away from the tube side tube plate surface, the groove width is 9mm, the distance between the two grooves is 6mm, and the groove depth is 0.5 mm. The tube expander is not expanded by 3mm from the surfaces of the two sides of the tube plate respectively because the rubber or liquid bag part of the tube expander exceeds the tube plate, the tube expander is easy to damage and liquid is sprayed out to hurt people, especially the tube pass side. There are areas of about 8mm of expansion before and after the expansion slot, except for 3mm before and after expansion, so tube sheets below 30mm are not recommended for this method.
And S3, forming pipe hole chamfers on two sides in two ends of the pipe hole.
Wherein, the angle of the chamfer of the pipe hole is 1 multiplied by 30 degrees.
Specifically, 1 x 30-degree pipe hole chamfers are machined on two sides in the pipe hole, so that the heat exchange pipe is convenient to assemble, sharp corners on the edge of the pipe hole can be removed, and the heat exchange pipe is prevented from being scratched.
And S4, arranging a heat exchange pipe chamfer at the intersection end part of the heat exchange pipe and the pipe hole, and removing end part burrs.
Wherein, the angle of the chamfer angle of the heat exchange tube is 0.5 multiplied by 45 degrees.
Specifically, the heat exchange tube is cut according to the length required by a preset drawing, and a 0.5X 45-degree heat exchange tube chamfer is processed at the intersection end position of the heat exchange tube and the tube hole, so that the tube expander can be inserted conveniently, burrs are removed simultaneously, and the tube expander is prevented from being damaged.
S5, cleaning the pipe hole, the inner surface and the outer surface of the heat exchange pipe, and assembling the heat exchange pipe and the pipe plate.
Specifically, impurities, oil stains, corrosion and the like on the inner and outer surfaces of the tube hole and the heat exchange tube are cleaned, and the heat exchange tube and the tube plate are assembled.
S6, selecting a corresponding tube expander according to the thickness of the tube plate and the inner diameter of the heat exchange tube, and confirming that the expansion joint equipment is intact and can normally work.
Specifically, the length of the rubber or liquid bag of the tube expander is less than or equal to the thickness of the tube plate minus 6mm, and the diameter of the tube expander is selected according to the inner diameter of the heat exchange tube; and (5) confirming that the expanded connection equipment is intact and can work normally.
And S7, selecting corresponding hydraulic expansion force to perform hydraulic expansion joint one by one.
Specifically, a proper hydraulic expansion force is selected for hydraulic expansion joint according to the evaluation of the expansion joint process.
In the embodiment of the invention, hydraulic expansion joint is specified, and the groove width opening of the expansion groove is set to be 8mm or 9 mm. The hydraulic expansion joint belongs to flexible expansion joint, and the heat exchange pipe can be prevented from being damaged and thinned due to the fact that pressure is uniformly applied to the heat exchange pipe. The invention has simple operation, stability and high efficiency, each pipe only needs several seconds, and each pipe is clean without cleaning after expansion joint, thereby greatly reducing the labor intensity and improving the production efficiency. Meanwhile, the expansion joint with good sealing performance and shearing performance can be obtained.
More specifically, the present invention has the following advantages:
1. the device is not limited by the thickness of the tube plate, can be used for opening double grooves or single grooves, and the single groove can completely meet the requirements of sealing and shearing.
2. The expansion of mechanical strength requires that the hardness of the heat exchange tube is lower than that of the tube plate, and the problem of poor hardness of the heat exchange tube and the tube plate is not required to be considered in the method.
3. The hydraulic expansion operation is flexible, the adaptability is strong, the utilization rate of the pipe expander is high, and one pipe expander can expand dozens of pipes and hundreds of pipes.
4. Lubricant is not needed to be added during expansion joint, and the pipe end and the pipe inside the expanded pipe are clean and do not need to be cleaned.
5. High working efficiency, good safety performance and greatly reduced labor intensity.
Example two
As shown in fig. 2, fig. 2 is a schematic structural diagram of an expansion joint of a heat exchange tube and a tube plate according to an embodiment of the present invention, which is formed by expanding a heat exchange tube 2 and a tube plate 1 according to the hydraulic expansion joint method of the embodiment, and includes: the heat exchange tube 2 and the tube plate 1 are arranged, the tube plate 1 is provided with a tube hole, an expansion groove 3 is formed in the inner wall of the tube hole, and the heat exchange tube 2 penetrates through the tube hole and is hydraulically expanded through the expansion groove 3 to form an integrated structure.
The groove width of the expansion groove 3 is 8mm or 9mm (for example, the diameter 19 tube H is 8mm, the diameter 25 tube H is 9mm), and the groove depth of the expansion groove 3 is 0.5 mm. So that the outer wall of the heat exchange tube 2 can be better extruded into the expansion groove 3, and the sealing performance is further improved.
The two sides of the pipe hole are provided with pipe hole chamfers with the angles of 1 multiplied by 30 degrees. This facilitates assembly of the heat exchange tube 2.
The intersection end position of the heat exchange tube 2 and the tube hole is provided with a heat exchange tube chamfer 4 with an angle of 0.5 multiplied by 45 degrees. Thus facilitating the installation of the pipe expander
The number of the expansion slots 3 is one or two. The expansion slot 3 can also meet the requirements of hydraulic expansion joint and the requirements of sealing performance and shearing performance. However, the expansion joint has better sealing performance and shearing performance by arranging the two expansion slots 3.
In fig. 2, "note" means: when only expansion welding is adopted, the thickness is more than or equal to 3mm, and when the expansion welding is used, the thickness is changed to 15 mm. H is the width of the expansion slot 3, phi 19 tubes H is 8mm, and phi 25 tubes H is 9 mm.
In the embodiment of the invention, the expanded joint of the heat exchange tube 2 and the tube plate 1 formed by the hydraulic expanded joint method of the heat exchange tube 2 and the tube plate 1 in the embodiment has better sealing performance and shearing performance.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A hydraulic expansion joint method for a heat exchange tube and a tube plate is characterized by comprising the following steps:
S1, machining a tube plate according to the requirement of a preset tube plate, and turning out tube holes on the tube plate;
s2, arranging expansion slots at preset positions of the inner walls of the pipe holes, wherein the slot widths of the expansion slots are 8mm or 9 mm;
s3, forming pipe hole chamfers on two sides in two ends of the pipe hole;
s4, arranging a heat exchange pipe chamfer at the intersection end part of the heat exchange pipe and the pipe hole, and removing end part burrs;
s5, cleaning the inner and outer surfaces of the pipe hole and the heat exchange pipe, and assembling the heat exchange pipe and the pipe plate;
s6, selecting a corresponding tube expander according to the thickness of the tube plate and the inner diameter of the heat exchange tube, and confirming that the expansion joint equipment is intact and can normally work;
and S7, selecting corresponding hydraulic expansion forces to perform hydraulic expansion joint one by one.
2. The method for hydraulically expanding a heat exchange tube and a tube sheet according to claim 1, wherein the number of the expansion slots is one or two in S2, and the preset positions are: the first expansion groove is formed at the position 11mm away from the tube side tube plate surface, and the groove distance between the two expansion grooves is 6 mm.
3. A method for hydraulically expanding a heat exchange tube and a tube sheet as claimed in claim 2, wherein the groove depth of the expansion groove is 0.5 mm.
4. A method for hydraulically expanding a heat exchange tube and a tube sheet as claimed in claim 1, wherein in S3, the tube hole is chamfered at an angle of 1 x 30 °.
5. The tube sheet hydraulic expansion joint method of heat exchange tube of claim 1, wherein in S4, the angle of the chamfer of the heat exchange tube is 0.5 x 45 °.
6. An expanded joint of a heat exchange tube and a tube plate, which is formed by expanding the heat exchange tube and the tube plate according to any one of claims 1 to 7 by a hydraulic expansion method, comprising: the heat exchange tube penetrates through the tube hole and is hydraulically expanded and connected through the expansion groove to form an integrated structure.
7. An expanded joint of a heat exchange tube and a tube sheet according to claim 6, wherein the slot width of the expansion slot is 8mm or 9mm, and the slot depth of the expansion slot is 0.5 mm.
8. An expanded joint of a heat exchange tube and a tube sheet as claimed in claim 6, wherein the tube hole is chamfered at an angle of 1 x 30 ° at both sides of the tube hole.
9. An expanded joint of a heat exchange tube and a tube plate as claimed in claim 6, wherein a chamfer of the heat exchange tube with an angle of 0.5 x 45 ° is provided at the intersection end position of the heat exchange tube and the tube hole.
10. An expanded joint of a heat exchange tube and a tube sheet according to any one of claims 6 to 9, wherein the number of the expansion slots is one or two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210251037.6A CN114669673A (en) | 2022-03-15 | 2022-03-15 | Hydraulic expansion joint method and expansion joint for heat exchange tube and tube plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210251037.6A CN114669673A (en) | 2022-03-15 | 2022-03-15 | Hydraulic expansion joint method and expansion joint for heat exchange tube and tube plate |
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| Publication Number | Publication Date |
|---|---|
| CN114669673A true CN114669673A (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210251037.6A Pending CN114669673A (en) | 2022-03-15 | 2022-03-15 | Hydraulic expansion joint method and expansion joint for heat exchange tube and tube plate |
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| CN (1) | CN114669673A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205519153U (en) * | 2016-04-21 | 2016-08-31 | 山西阳煤化工机械（集团）有限公司 | Flexible intensity expanded joint structure |
| CN106706298A (en) * | 2017-01-11 | 2017-05-24 | 江苏省特种设备安全监督检验研究院 | Expanding connection process evaluation method for tube-tube plate joint |
| CN108202110A (en) * | 2018-02-01 | 2018-06-26 | 珠海格力电器股份有限公司 | Heat exchanger pipe-expanding device |
-
2022
- 2022-03-15 CN CN202210251037.6A patent/CN114669673A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205519153U (en) * | 2016-04-21 | 2016-08-31 | 山西阳煤化工机械（集团）有限公司 | Flexible intensity expanded joint structure |
| CN106706298A (en) * | 2017-01-11 | 2017-05-24 | 江苏省特种设备安全监督检验研究院 | Expanding connection process evaluation method for tube-tube plate joint |
| CN108202110A (en) * | 2018-02-01 | 2018-06-26 | 珠海格力电器股份有限公司 | Heat exchanger pipe-expanding device |
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