CN109883665B - Method for sealing positive pressure helium inside superconducting magnet coil - Google Patents

Method for sealing positive pressure helium inside superconducting magnet coil Download PDF

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Publication number
CN109883665B
CN109883665B CN201910031725.XA CN201910031725A CN109883665B CN 109883665 B CN109883665 B CN 109883665B CN 201910031725 A CN201910031725 A CN 201910031725A CN 109883665 B CN109883665 B CN 109883665B
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stainless steel
steel pipe
superconducting magnet
magnet coil
valve
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CN109883665A (en
Inventor
谢延玉
吴欢
宋云涛
陆坤
卫靖
沈光
吴维越
曹福坤
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Hefei Institutes of Physical Science of CAS
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Hefei Institutes of Physical Science of CAS
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Abstract

The invention discloses a sealing method of positive pressure helium inside a superconducting magnet coil, which is characterized in that the positive pressure helium inside the superconducting magnet coil is sealed and welded through a pipeline system, the pipeline system comprises a stainless steel pipe, one end of the stainless steel pipe is connected with an air inlet pipeline of the superconducting magnet coil, the other end of the stainless steel pipe is connected with a pressurizing pipeline, the pressurizing pipeline is sequentially connected with a first stop valve, a first three-way valve, a second stop valve and a pressure reducing valve, the first three-way valve is connected with a deflation valve, the second three-way valve is sequentially connected with a third stop valve and a pressure gauge, a high-purity helium bottle is connected to a pipe orifice behind the pressure reducing valve of the pressurizing pipeline, two vertical flattening operations are carried out at the proper position of the stainless steel pipe after required positive pressure helium pressure. The method is simple, the sealing effect is good, the size is small, the shape is regular, the method is flexible and mobile, and the method is suitable for multiple occasions; economical and practical, and simple to maintain.

Description

Method for sealing positive pressure helium inside superconducting magnet coil
Technical Field
The invention relates to the technical field of superconducting magnet coil test methods, in particular to a sealing method of positive pressure helium in a superconducting magnet coil.
Background
In a superconducting tokamak apparatus, a superconducting magnet coil is an important and indispensable part thereof. In the manufacturing process of the superconducting magnet coil, the problems that positive pressure gas needs to be injected into the superconducting magnet coil and the superconducting magnet coil needs to be sealed are often encountered, for example, 3MPa helium gas needs to be injected into the superconducting magnet coil as tracer gas during vacuum leak detection of the superconducting magnet. After helium is injected, positive pressure helium sealing is needed, and the traditional positive pressure helium sealing method generally adopts valve sealing, but in the engineering application process, the valve sealing has several disadvantages: 1. the knob of the valve is at risk of being manually unscrewed. 2. The valve has a large volume, and when parts such as small-aperture wedges need to cross the valve to be installed, the risk of being clamped by the valve exists. 3. The shape of the valve is irregular, the sealing part needs to be subjected to wet packaging in some tests, and the irregular shape of the valve brings certain difficulty to the wet packaging treatment. Accordingly, the present patent describes a positive pressure helium gas seal method that does not require a valve seal.
Disclosure of Invention
The invention aims to make up for the defects of the prior art and provides a method for sealing positive pressure helium inside a superconducting magnet coil.
The invention is realized by the following technical scheme:
a method for sealing positive pressure helium in a superconducting magnet coil is characterized by comprising the following steps: the positive pressure helium gas in the superconducting magnet coil is hermetically welded through a pipeline system, the pipeline system comprises a stainless steel pipe, one end of the stainless steel pipe is connected with an air inlet pipeline of the superconducting magnet coil, the other end of the stainless steel pipe is connected with a pressurizing pipeline, a first stop valve, a first three-way valve, a second stop valve and a pressure reducing valve are sequentially connected to the pressurizing pipeline, the first three-way valve is connected with a deflation valve, the second three-way valve is sequentially connected with a third stop valve and a pressure gauge, and a high-purity helium bottle is connected to a pipe; the specific sealing method comprises the following steps: sealing and welding one end of a stainless steel pipe with a superconducting magnet coil and the other end of the stainless steel pipe with a pressurizing pipeline by using an argon arc welding machine, injecting a certain helium pressure into the superconducting magnet coil through the pressurizing pipeline, closing the pressure reducing valve after the helium injection work is finished, closing a second stop valve and a first stop valve, extruding the stainless steel pipe by using a manual hydraulic crimping clamp at a position of the stainless steel pipe, which is about one third away from the welding end of the superconducting magnet coil, performing a first flattening operation, performing a second flattening operation at a position of about two thirds away from the welding end of the superconducting magnet coil, wherein the second flattening operation is vertical to the first flattening operation, after the second flattening operation, continuously applying pressure by using the manual hydraulic crimping clamp, opening the first stop valve, opening a gas release valve, and releasing the section of helium between the first stop valve and the second stop valve, and opening the leak detector, placing a suction gun of the leak detector at the outlet position of a vent valve for leak detection, if a leak point is detected, enlarging a manual hydraulic crimping pliers to continuously apply pressure or perform a third flattening operation to remove the leak point, if the leak detector does not detect the leak point, cutting off the stainless steel pipe at a position 10cm away from the second flattening position, sealing and welding the cut position of the stainless steel pipe by using an argon arc welding machine, then loosening the manual hydraulic crimping pliers, checking whether the cut welding position of the stainless steel pipe has the leak point by using the suction gun of the leak detector, and performing repair welding operation if the leak point exists so as to ensure that the leak does not exist, wherein if the leak point does not exist, the sealing requirement can be met.
The stainless steel pipe material be 304 stainless steel, the external diameter is 6mm, the internal diameter is 4mm, length is 600mm at least.
After the first flattening operation and the second flattening operation, the thickness of the stainless steel tube is also controlled to be 1.8 +/-0.05 mm.
The leak detector has a suction gun leak detection function, and is provided with a suction gun and a corresponding pipeline thereof, the rated working pressure of the manual hydraulic pressure welding pliers is 10t, the working stroke is 14mm, and the die is selected to be 10 mm.
The invention has the advantages that:
the method is simple and easy to operate, and is specifically represented as follows:
1) the pressure of the sealing helium is high and can reach at least 3 MPa;
2) the sealing effect is good, and long-term sealing is facilitated;
3) the size is small, and small-bore parts such as wedges are easy to pass;
4) the shape is regular, and the operation such as wet packaging is easy;
5) flexible and mobile, and has many applicable occasions;
6) economical and practical, and simple to maintain.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
See the drawings.
A sealing method of positive pressure helium inside a superconducting magnet coil is characterized in that the positive pressure helium inside the superconducting magnet coil is sealed and welded through a pipeline system, the pipeline system comprises a stainless steel pipe 2, one end of the stainless steel pipe 2 is connected with an air inlet pipeline of the superconducting magnet coil 1, the other end of the stainless steel pipe is connected with a pressurizing pipeline 5, a first stop valve 6-1, a first three-way valve 7-1, a second three-way valve 7-2, a second stop valve 6-2 and a pressure reducing valve 8 are sequentially connected to the pressurizing pipeline 5, the first three-way valve 7-1 is connected with a vent valve 6-4, the second three-way valve 7-2 is sequentially connected with a third stop valve 6-3 and a pressure gauge 10, and a pipe orifice behind the pressure reducing valve;
the specific sealing method comprises the following steps: and (3) carrying out sealing welding on the stainless steel pipe 2 and the superconducting magnet coil 1 by using an argon arc welding machine, and carrying out sealing welding on the stainless steel pipe 2 and the pressing pipeline 5 by using the argon arc welding machine. Opening the first stop valve 6-1, the second stop valve 6-2 and the third stop valve 6-3, closing the air release valve 6-4, opening the switch of the high-purity helium bottle 9, slowly opening the pressure reducing valve 8, pressurizing the superconducting magnet coil, closing the first stop valve 6-1, the second stop valve 6-2, closing the switch of the high-purity helium bottle 9, closing the pressure reducing valve 8 and stopping pressurizing after the indication number of the pressure gauge 10 shows 3MPa and is kept stable for a period of time.
The length of the stainless steel tube is 600mm, a first flattening operation is carried out on a position 3-1 of the stainless steel tube 2 200mm away from the welding end of the superconducting magnet coil 1 by using manual hydraulic crimping pliers, and the thickness of the position 3-1 of the stainless steel tube after being flattened is controlled to be 1.8 +/-0.05 mm. And performing a second flattening operation on the stainless steel pipe 2 at a position 3-2 200mm away from the first flattening operation, wherein the second flattening operation and the first flattening operation are mutually vertical, and the thickness of the position 3-2 of the stainless steel pipe after being flattened is controlled to be 1.8 +/-0.05 mm. After the second flattening, the manual hydraulic crimping pliers continue to exert force, the air release valve 6-4 is opened, helium between the first stop valve 6-1 and the second stop valve 6-2 is released, the first stop valve 6-1 is opened, the leak detector 14 is opened and is adjusted to a suction gun leak detection mode, a suction gun of the leak detector 14 is placed at the outlet position of the air release valve 6-4, whether leakage exists at the two vertical flattening positions 3-1 and 3-2 is detected, when the leak detector does not detect leakage, the stainless steel pipe is cut off at the 500mm position 4 of the stainless steel pipe 2, and the notch position 4 of the stainless steel pipe 2 is welded tightly through an argon arc welding machine. The manual hydraulic pressure crimping pliers are released, and the welding position of the notch weld-dead position 4 of the stainless steel pipe 2 is checked using the suction gun of the leak detector 13.

Claims (4)

1. A method for sealing positive pressure helium in a superconducting magnet coil is characterized by comprising the following steps: the positive pressure helium gas in the superconducting magnet coil is hermetically welded through a pipeline system, the pipeline system comprises a stainless steel pipe, one end of the stainless steel pipe is connected with an air inlet pipeline of the superconducting magnet coil, the other end of the stainless steel pipe is connected with a pressurizing pipeline, a first stop valve, a first three-way valve, a second stop valve and a pressure reducing valve are sequentially connected to the pressurizing pipeline, the first three-way valve is connected with a gas release valve, a leak detector is arranged at the outlet of the gas release valve, the second three-way valve is sequentially connected with a third stop valve and a pressure gauge, and a high-purity; the specific sealing method comprises the following steps: sealing and welding one end of a stainless steel pipe with a superconducting magnet coil and the other end of the stainless steel pipe with a pressurizing pipeline by using an argon arc welding machine, injecting a certain helium pressure into the superconducting magnet coil through the pressurizing pipeline, closing the pressure reducing valve after the helium injection work is finished, closing a second stop valve and a first stop valve, extruding the stainless steel pipe by using a manual hydraulic crimping pliers at a position of one third of the stainless steel pipe away from the welding end of the superconducting magnet coil, performing a first flattening operation, performing a second flattening operation at a position of two thirds of the welding end of the superconducting magnet coil, wherein the second flattening operation is vertical to the first flattening operation, continuously applying pressure by using the manual hydraulic crimping pliers after the second flattening operation, opening the first stop valve, opening a gas release valve, and releasing the section of helium between the first stop valve and the second stop valve, and opening the leak detector, placing a suction gun of the leak detector at the outlet position of a vent valve for leak detection, increasing a manual hydraulic crimping tong to continuously apply pressure or perform a third flattening operation if a leak point is detected, removing the leak point, cutting off the stainless steel pipe at a position 100mm away from a second flattening position if the leak point is not detected by the leak detector, sealing and welding the cut position of the stainless steel pipe by using an argon arc welding machine, loosening the manual hydraulic crimping tong, checking whether the cut welding position of the stainless steel pipe has the leak point by using the suction gun of the leak detector, performing repair welding operation if the leak point exists, and ensuring that the leak does not exist, wherein the sealing requirement can be met if the leak point does not exist.
2. The method of sealing positive pressure helium gas inside a superconducting magnet coil according to claim 1, wherein: the stainless steel pipe material be 304 stainless steel, stainless steel pipe's length is 600mm at least, the external diameter is 6mm, the internal diameter is 4 mm.
3. The method of sealing positive pressure helium gas inside a superconducting magnet coil according to claim 1, wherein: after the first flattening operation and the second flattening operation, the thickness of the stainless steel tube is also controlled to be 1.8 +/-0.05 mm.
4. The method of sealing positive pressure helium gas inside a superconducting magnet coil according to claim 1, wherein: the leak detector has a suction gun leak detection function, and is provided with a suction gun and a corresponding pipeline thereof, the rated working pressure of the manual hydraulic pressure welding pliers is 10t, the working stroke is 14mm, and the die is selected to be 10 mm.
CN201910031725.XA 2019-01-14 2019-01-14 Method for sealing positive pressure helium inside superconducting magnet coil Active CN109883665B (en)

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CN109883665B true CN109883665B (en) 2021-04-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50160693A (en) * 1974-03-15 1975-12-26
CN104568336A (en) * 2015-01-26 2015-04-29 上海贤日自动化设备有限公司 Helium mass spectrometer leak detection method for sealing workpiece
CN207318024U (en) * 2017-08-08 2018-05-04 上海电气核电设备有限公司 Helium inspection seal box after a kind of tube-tube plate test block plugging
CN108444651A (en) * 2018-06-21 2018-08-24 中国核动力研究设计院 A kind of isotope target piece helium mass spectrum leak detecting device and detection method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50160693A (en) * 1974-03-15 1975-12-26
CN104568336A (en) * 2015-01-26 2015-04-29 上海贤日自动化设备有限公司 Helium mass spectrometer leak detection method for sealing workpiece
CN207318024U (en) * 2017-08-08 2018-05-04 上海电气核电设备有限公司 Helium inspection seal box after a kind of tube-tube plate test block plugging
CN108444651A (en) * 2018-06-21 2018-08-24 中国核动力研究设计院 A kind of isotope target piece helium mass spectrum leak detecting device and detection method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HT-7U超导托卡马克装置低温杜瓦的真空问题;王小明等;《真空》;20030331(第02期);第35-39页 *

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