CN112325264A - Boiler header connecting pipe with hot spinning water pressure end socket and machining method thereof - Google Patents
Boiler header connecting pipe with hot spinning water pressure end socket and machining method thereof Download PDFInfo
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- CN112325264A CN112325264A CN202011236727.1A CN202011236727A CN112325264A CN 112325264 A CN112325264 A CN 112325264A CN 202011236727 A CN202011236727 A CN 202011236727A CN 112325264 A CN112325264 A CN 112325264A
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- connecting pipe
- water pressure
- hot spinning
- pipe body
- end socket
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/104—Connection of tubes one with the other or with collectors, drums or distributors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a boiler header connecting pipe with a hot spinning water pressure end socket and a processing method thereof, belonging to the technical field of boiler equipment manufacturing. The connecting pipe comprises a connecting pipe body, wherein a water pressure end socket is formed at one end of the connecting pipe body through hot spinning, and a welding groove is formed at the other end of the connecting pipe body; a hot spinning process hole is reserved on the water pressure end enclosure; during the hydrostatic test, the connecting pipe body and the header body are welded and fixed, and the hot spinning fabrication hole is plugged. The complex procedures of processing the blocking plate welding groove, processing the blocking plate, sealing and welding the blocking plate and the like are avoided, and the waste of raw materials for additionally processing the blocking plate is avoided. With the water pressure head of taking over body integral type, firm reliable has avoided the problem that hydrostatic test revealed. The strength of the process holes left by the hot spinning forming process can meet the hydraulic test requirements of all the existing ultra-supercritical unit boiler header tanks only by plugging the process holes by using methods such as arc welding and the like, and only the hydraulic seal heads need to be cut off after the test, so that a large amount of manpower and material resources are saved, the production efficiency is improved, and the cost of an enterprise is obviously reduced.
Description
Technical Field
The invention belongs to the technical field of boiler equipment manufacturing, and particularly relates to a boiler header connecting pipe with a hot spinning water pressure end socket and a processing method thereof.
Background
The boiler equipment is equipment for heating water into high-temperature high-pressure steam, a header is used as a key part in the boiler equipment, the structure form of the boiler equipment is that an open small-diameter connecting pipe is welded on a large-diameter pipeline, and the header connecting pipe is welded with a heating surface pipe on a boiler installation site. After the header is processed in a manufacturing plant, a hydrostatic test is carried out to test the reliability of the product. All the header connecting pipes need to be plugged during the hydrostatic test, and the number of the connecting pipes on the common header is dozens to hundreds, more or even thousands. The existing plugging method is to weld a circular plugging plate on a header connecting pipe. The method comprises the steps of firstly processing a step on the inner wall of a header connecting pipe, placing a round steel plate, then adopting a welding method to completely seal and weld the round steel and the connecting pipe along the pipe wall for one circle, and cutting off a plugging end after a hydrostatic test is finished. The method needs to process steps on the inner wall of the butt-jointed pipe, and needs to purchase round steel plates made of the same grade material as the small-caliber adapter pipe, and the whole circle of sealing welding is needed, so that the welding workload is large; meanwhile, because the round steel plate is a temporary assembly part, workers can weld randomly, so that leakage often occurs during hydrostatic test, and production efficiency is seriously influenced; and the cut-off round steel plates at the blocking ends are fused with the pipe wall, so that the round steel plates cannot be reused.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the boiler header connecting pipe with the hot spinning water pressure end socket and the processing method thereof, so that the production efficiency of the header is improved, and the cost is reduced.
The invention is realized by the following technical scheme:
the invention discloses a boiler header connecting pipe with a hot spinning water pressure end socket, which comprises a connecting pipe body, wherein one end of the connecting pipe body is hot-spun and formed with the water pressure end socket, and the other end of the connecting pipe body is provided with a welding groove; a hot spinning process hole is reserved on the water pressure end enclosure;
during the hydrostatic test, the connecting pipe body and the header body are welded and fixed, and the hot spinning fabrication hole is plugged.
Preferably, the hydraulic head is hemispherical.
Preferably, the axial length of the hydraulic head is 50% of the nozzle body.
Preferably, the thickness of the water pressure sealing head is more than 90% of the wall thickness of the connecting pipe body.
Preferably, the center of the hot spinning process hole is located on the axis of the adapter body.
Preferably, the diameter of the hot spinning process hole is 3-8 mm.
Preferably, the connecting part of the connecting pipe body and the water pressure sealing head is provided with an indication mark.
The invention discloses a method for processing a boiler header connecting pipe with a hot spinning water pressure end socket, which comprises the following steps:
1) processing a connecting pipe body, wherein the length for processing a water pressure sealing head is reserved at one end of the connecting pipe body;
2) carrying out rotary extrusion on a reserved part of the butt joint pipe body after high-frequency electromagnetic heating, and reserving a hot spinning process hole on the formed water pressure seal head;
3) and a welding groove used for being connected with the header body is processed at the other end of the connecting pipe body.
Preferably, the temperature of the high-frequency electromagnetic heating is 950-1050 ℃.
Preferably, the length of the reserved one end of the connecting pipe body for processing the water pressure seal head is 60-80 mm.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the boiler header connecting pipe with the hot spinning water pressure end socket, one end of the connecting pipe body is the hot spinning formed integral water pressure end socket, so that complicated procedures of processing a welding groove of the blocking plate, processing the blocking plate, sealing and welding the blocking plate and the like are avoided, and waste of raw materials for additionally processing the blocking plate is avoided. With the water pressure head of taking over body integral type, firm reliable has avoided the problem that hydrostatic test revealed. The strength of the process holes left by the hot spinning forming process can meet the hydraulic test requirements of all the existing ultra-supercritical unit boiler header tanks only by plugging the process holes by using methods such as arc welding and the like, and only the hydraulic seal heads need to be cut off after the test, so that a large amount of manpower and material resources are saved, the production efficiency is improved, and the cost of an enterprise is obviously reduced.
Furthermore, the hydraulic seal head is a hemisphere, the hot spinning forming is simple, the stress is uniform during the hydraulic test, and the safety and the reliability are good.
Furthermore, the thickness of the water pressure sealing head is more than 90% of the wall thickness of the connecting pipe body, and the phenomenon that the strength is affected by excessively weak parts is avoided.
Furthermore, the circle center of the hot spinning process hole is located on the axis of the connecting pipe body, the process is easy to control, the shape in the hole is regular, and welding plugging is facilitated.
Furthermore, the diameter of the hot spinning process hole is 3-8 mm, so that the process is easy to control on one hand, and welding plugging is convenient on the other hand.
Furthermore, the joint of the connecting pipe body and the water pressure end socket is provided with an indication mark, so that the connecting pipe body can be conveniently cut off after a water pressure test, the connecting pipe body is prevented from being damaged, and the construction efficiency is improved.
According to the processing method of the boiler header connecting pipe with the hot spinning water pressure end socket, the length section for hot spinning forming is reserved on the processed connecting pipe body, and the integral water pressure end socket can be obtained by performing hot spinning forming on the length section. The method is simple and convenient to operate, the hot spinning process is mature, the production efficiency is greatly improved, and the cost is saved.
Further, the length that is used for processing water pressure head is reserved to the one end of taking over the body is 60 ~ 80mm, is convenient for on the one hand carry out hot spinning processing, and on the other hand suitable length can reduce the cost.
Drawings
FIG. 1 is a schematic view of the overall structure of a boiler header connecting pipe with a hot spinning hydraulic head according to the present invention.
In the figure: 1-connecting pipe body, 2-header body, 3-water pressure end socket and 4-hot spinning process hole.
Detailed Description
The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:
referring to fig. 1, the boiler header connecting pipe with the hot spinning water pressure end enclosure comprises a connecting pipe body 1, wherein a water pressure end enclosure 3 is formed at one end of the connecting pipe body 1 in a hot spinning mode, the water pressure end enclosure 3 is a hemisphere, the axial length of the water pressure end enclosure 3 is 50% of that of the connecting pipe body 1, and the thickness of the water pressure end enclosure 3 is more than 90% of that of the connecting pipe body 1. A hot spinning process hole 4 is formed in the water pressure sealing head 3, the circle center of the hot spinning process hole 4 is located on the axis of the connecting pipe body 1, and the diameter of the hot spinning process hole 4 is 3-8 mm. During the hydrostatic test, the hot spinning fabrication hole 4 is sealed by arc welding, and the arc welding uses a welding material which is the same as the material of the connecting pipe body 1.
The other end of the connecting pipe body 1 is provided with a welding groove. The joint of the connecting pipe body 1 and the water pressure end enclosure 3 is provided with an indication mark, so that the water pressure test can be conveniently cut off.
The processing method of the boiler header connecting pipe with the hot spinning water pressure end socket comprises the following steps:
1) processing a connecting pipe body 1, wherein the length for processing a water pressure sealing head 3 is reserved at one end of the connecting pipe body 1 and is generally 60-80 mm;
2) heating the reserved part of the butt joint pipe body 1 to 950-1050 ℃ by high-frequency electromagnetic heating, then performing rotary extrusion, and leaving a hot spinning process hole 4 in the formed water pressure seal head 3; after the hydraulic end socket 3 is formed, the pipe body 1 can be bent to meet the requirements of different angles;
3) and a welding groove used for being connected with the header body 2 is processed at the other end of the connecting pipe body 1.
In an embodiment of the present invention, the size of the adapter body 1 is calculated according to design parameters, the adapter body 1 has a length margin of 70mm compared with the design value, the adapter body 1 is made of 12Cr1MoVG, and the specification is as follows: Φ 42 × 8.5 mm.
Step 1: one end of the connecting pipe body 1 is heated to 950-1050 ℃ by high-frequency electromagnetic heating and then is rotated and extruded to form a water pressure end enclosure 3, a hot spinning process hole 4 is reserved in the formed water pressure end enclosure 3, the diameter of the small hole is 4mm, and the hot spinning process hole 4 is located on the central axis of the connecting pipe body 1;
step 2: the other end of the connecting pipe body 1 is machined with a groove according to the drawing requirements, and the header body 2 is drilled according to the drawing. The connecting pipe body 1 and the collecting box body 2 are drilled by full penetration welding, and the hot spinning process hole 4 at the end of the welded hydraulic seal head 3 is sealed by arc welding.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (10)
1. A boiler header connecting pipe with a hot spinning water pressure end socket is characterized by comprising a connecting pipe body (1), wherein a water pressure end socket (3) is formed at one end of the connecting pipe body (1) in a hot spinning mode, and a welding groove is formed at the other end of the connecting pipe body; a hot spinning process hole (4) is reserved on the water pressure end enclosure (3);
during the hydrostatic test, the connecting pipe body (1) and the header body (2) are welded and fixed, and the hot spinning process hole (4) is plugged.
2. The boiler header connecting pipe with the hot spinning water pressure end socket as claimed in claim 1, wherein the water pressure end socket (3) is a hemisphere.
3. Boiler header connection pipe with hot spinning hydraulic head according to claim 1, characterized in that the axial length of the hydraulic head (3) is 50% of the connection pipe body (1).
4. Boiler header connection pipe with hot spinning hydraulic head according to claim 1, characterized in that the thickness of the hydraulic head (3) is more than 90% of the wall thickness of the connection pipe body (1).
5. The boiler header connecting pipe with the hot spinning water pressure end socket as claimed in claim 1, wherein the center of the hot spinning fabrication hole (4) is located on the axis of the connecting pipe body (1).
6. The boiler header connecting pipe with the hot spinning water pressure end socket as claimed in claim 1, wherein the diameter of the hot spinning fabrication hole (4) is 3-8 mm.
7. The boiler header connecting pipe with the hot spinning water pressure end socket as claimed in claim 1, wherein an indication mark is arranged at the joint of the connecting pipe body (1) and the water pressure end socket (3).
8. The processing method of the boiler header connecting pipe with the hot spinning water pressure head as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
1) processing a connecting pipe body (1), wherein the length for processing a water pressure seal head (3) is reserved at one end of the connecting pipe body (1);
2) the reserved part of the butt joint pipe body (1) is heated by high-frequency electromagnetic waves and then is subjected to rotary extrusion, and a hot spinning process hole (4) is reserved in the formed water pressure seal head (3);
3) and a welding groove used for being connected with the header body (2) is processed at the other end of the connecting pipe body (1).
9. The processing method of the boiler header connecting pipe with the hot spinning water pressure head as claimed in claim 8, wherein the temperature of the high-frequency electromagnetic heating is 950-1050 ℃.
10. The processing method of the boiler header connecting pipe with the hot spinning water pressure sealing head as claimed in claim 8, wherein the length reserved for processing the water pressure sealing head (3) at one end of the connecting pipe body (1) is 60-80 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236727.1A CN112325264A (en) | 2020-11-09 | 2020-11-09 | Boiler header connecting pipe with hot spinning water pressure end socket and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236727.1A CN112325264A (en) | 2020-11-09 | 2020-11-09 | Boiler header connecting pipe with hot spinning water pressure end socket and machining method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112325264A true CN112325264A (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011236727.1A Pending CN112325264A (en) | 2020-11-09 | 2020-11-09 | Boiler header connecting pipe with hot spinning water pressure end socket and machining method thereof |
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| CN (1) | CN112325264A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198161A (en) * | 2022-07-25 | 2022-10-18 | 华能国际电力股份有限公司 | Header for 650 ℃ and above grade boiler unit and preparation method thereof |
| CN117548998A (en) * | 2023-11-21 | 2024-02-13 | 华钛空天(北京)技术有限责任公司 | Preparation method, device, equipment and medium for thin-wall cavity rudder |
-
2020
- 2020-11-09 CN CN202011236727.1A patent/CN112325264A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198161A (en) * | 2022-07-25 | 2022-10-18 | 华能国际电力股份有限公司 | Header for 650 ℃ and above grade boiler unit and preparation method thereof |
| CN117548998A (en) * | 2023-11-21 | 2024-02-13 | 华钛空天(北京)技术有限责任公司 | Preparation method, device, equipment and medium for thin-wall cavity rudder |
| CN117548998B (en) * | 2023-11-21 | 2024-05-07 | 华钛空天(北京)技术有限责任公司 | Preparation method, device, equipment and medium for thin-wall cavity rudder |
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