CN219244913U

CN219244913U - 4K neck pipe detection device

Info

Publication number: CN219244913U
Application number: CN202321129189.5U
Authority: CN
Inventors: 李先鹏; 胡修贺; 刘大鹏; 李培勇; 高沪光; 张永昌
Original assignee: Shandong Aoxin Medical Technology Co ltd
Current assignee: Shandong Aoxin Medical Technology Co ltd
Priority date: 2023-05-11
Filing date: 2023-05-11
Publication date: 2023-06-23
Anticipated expiration: 2033-05-11

Abstract

The utility model relates to the technical field of superconducting magnet detection, in particular to a 4K neck tube detection device which comprises a first flange and a second flange which are arranged at intervals, wherein the first flange and the second flange are fixedly connected through a plurality of support columns, and the support columns are detachably connected with the first flange; and the second flange is provided with a mounting seat matched with the lower end of the 4K neck pipe. The mount pad includes the barrel with the internal diameter looks adaptation of 4K neck pipe lower part, is equipped with the bevel connection step on the outer circumference of barrel, bevel connection step and 4K neck pipe's lower extreme looks adaptation. The first flange is provided with an annular groove, and a sealing element is arranged in the groove. The 4K neck tube detection device adopts a detachable fixed assembly mode, and has firm and stable structure; the device has a good fixing effect on the 4K neck tube, is suitable for vacuumizing and pressing two detection items, cannot cause the deformation of the bellows in the 4K neck tube in the detection process, and has the advantages of convenience in detection, high detection efficiency and the like.

Description

4K neck pipe detection device

Technical Field

The utility model relates to the technical field of superconducting magnet detection, in particular to a 4K neck tube detection device.

Background

In the superconducting magnet 4K cavity structure, a 4K neck tube is an integral part thereof. The 4K neck tube is a component structure for connecting the outside with the 4K cavity of the superconducting magnet, and the structure of the 4K neck tube comprises two sections of corrugated tubes. The superconducting magnet needs to be used for infusing liquid nitrogen, infusing liquid helium, exciting and entering and exiting the signal wire. The leak rate and bearing capacity of the structural assembly are related to whether the superconducting magnet can operate stably at low temperature.

The leakage rate of the 4K neck pipe is related to the low-temperature operation condition of the whole superconducting system, the consumption of liquid helium in the 4K cavity is increased sharply due to the higher leakage rate, the internal temperature of the whole superconducting system is increased, and the superconducting coil is quenched when the internal temperature is increased seriously, so that huge loss is generated. The size of the 4K neck bearing capacity is related to whether the entire 4K chamber can withstand the pressure of the gas generated by the volatilization of liquid helium.

Before the 4K neck pipe is installed and used, the 4K neck pipe needs to be subjected to vacuumizing leakage detection and pressure bearing test. The vacuum pumping leakage detection is to vacuumize a closed cavity, which is connected with a helium mass spectrometer leakage detector and used for detecting the leakage rate of the cavity so as to judge whether the leakage rate meets the use requirement or not, and the vacuum pumping is usually abbreviated. The pressure bearing test is to carry out inflation pressurization on a closed cavity to observe whether breakage, deformation and pressure drop occur or not in a period of time, and is usually called as pressure pressing for short. Thus, the vacuum and compression test is particularly important for 4K neck tubes.

In the prior art, when a common testing device is used for vacuumizing and pressurizing, the corrugated pipe part of the 4K neck pipe is subjected to compression deformation and extension deformation, and risk hidden danger can be generated on the 4K neck pipe. For example, in a 1.5 tesla superconducting magnet, compression deformation and elongation deformation of the bottom bellows occur during the evacuation and pressing of the 4K neck tube, and the bottom bellows is re-stretched or compressed every time the 4K neck tube is installed, which causes a risk of damage to the bottom bellows and great inconvenience to the installation.

The testing device in the prior art has the defects of great risk hidden trouble caused to the 4K neck tube, time and labor waste and the like in later installation and use, and is unfavorable for safe and efficient production.

Disclosure of Invention

Aiming at the defects, the utility model provides the 4K neck tube detection device which adopts a detachable fixed assembly mode and has firm and stable structure; the device has a good fixing effect on the 4K neck tube, is suitable for vacuumizing and pressing two detection items, cannot cause the deformation of the bellows in the 4K neck tube in the detection process, and has the advantages of convenience in detection, high detection efficiency and the like.

In order to solve the problems, the utility model adopts the following technical scheme:

A4K neck tube detection device comprises a first flange and a second flange which are arranged at intervals, wherein the first flange and the second flange are fixedly connected through a plurality of support columns, and the support columns are detachably connected with the first flange; the second flange is provided with a mounting seat which is matched with the lower end of the 4K neck pipe;

the mounting seat comprises a cylinder body which is matched with the inner diameter of the lower part of the 4K neck pipe, an inclined step is arranged on the outer circumference of the cylinder body, and the inclined step is matched with the lower end of the 4K neck pipe; when in use, the lower part of the 4K neck tube is sleeved on the cylinder; the lower end of the 4K neck tube is abutted against the bevel-mouth step.

As an improvement, the first flange is provided with a groove, and a sealing element is arranged in the groove.

As an improvement, the first flange is provided with a convex positioning step, and the positioning step is matched with the inner diameter of the upper end of the 4K neck pipe.

As an improvement, the device also comprises a plurality of transition plates arranged on the side part of the first flange, and the plurality of transition plates are detachably arranged on the first flange through fixing pieces. The fixing piece is an F-shaped clamp or a C-shaped clamp.

As an improvement, the device also comprises a fixing seat, wherein the fixing seat is provided with a connecting hole and a through hole, and one support column is arranged in the through hole.

As an improvement, the fixing seat is provided with a convex connecting part, and the through hole is arranged on the connecting part; the axial direction of the through hole is the same as the extending direction of the support column; the axial direction of the connecting hole is perpendicular to the extending direction of the supporting column.

As an improvement, the first flange and the second flange are respectively provided with a mounting hole, and two ends of the support column are respectively and fixedly arranged in the mounting holes of the first flange and the second flange.

As an improvement, both ends of the support column are respectively provided with an external thread section, and both ends of the support column are respectively fixed in the mounting hole of the first flange and the mounting hole of the second flange through two nuts.

As an improvement, the first flange or the second flange is provided with a vent pipe.

Compared with the prior art, the utility model has the following advantages:

the 4K neck pipe detection device of the technical scheme adopts a detachable fixed assembly mode, is firm and stable in structure, and the support column has good fixing effect on the 4K neck pipe, and cannot cause deformation of the corrugated pipe part in the process of vacuumizing detection and pressing detection on the 4K neck pipe. And two detection items of vacuumizing and pressurizing can be quickly converted, and the vacuum-pumping and pressurizing device is convenient to use and can be used only on the same tool, so that the testing time is saved, and the working efficiency is improved. The operation is very convenient, and all tests can be completed only by one person.

The utility model will now be described in detail with reference to the drawings and examples.

Drawings

FIG. 1 is a schematic diagram of a 4K neck tube detection device according to the present utility model;

FIG. 2 is a schematic diagram of a 4K neck tube detection device according to the second embodiment of the present utility model;

FIG. 3 is a schematic view of the first flange of FIG. 1;

FIG. 4 is a schematic view of the second flange of FIG. 1;

FIG. 5 is a schematic view of the transition plate of FIG. 1;

FIG. 6 is a schematic diagram of the holder of FIG. 1;

FIG. 7 is a schematic view of a 4K neck;

FIG. 8 is a reference diagram of a 4K neck tube detection device according to the present utility model;

FIG. 9 is a reference diagram showing a usage status of a 4K neck tube detection device according to the present utility model;

wherein: 1-first flange, 2-second flange, 3-support column, 5-breather pipe, 6-barrel, 7-bevel step, 8-recess, 9-sealing member, 10-location step, 11-transition plate, 12-fixing base, 13-through hole, 14-connecting part, 15-connecting hole, 16-mounting hole, 17-nut, 18-mount, 19-upper bellows, 20-lower bellows, 21-straight tube, 22-upper flange, 23-copper ring, 24-helium mass spectrometer leak detector, 25-tee bend, 26-manometer, 27-angle valve, 28-aerating device.

Detailed Description

As shown in fig. 7, the 4K neck tube of the superconducting magnet has a tubular structure, and includes an upper bellows 19, a lower bellows 20, and a straight tube 21, which are sequentially communicated from top to bottom. The lower end of the straight pipe 21 is a bevel connection, and the bevel connection is matched with the 4K cylinder of the superconducting magnet, so that the 4K neck pipe is convenient to install on the 4K cylinder. The upper end of the upper bellows 19 is provided with an upper end flange 22. A copper ring 23 is fixedly arranged at the joint of the upper corrugated pipe 19 and the lower corrugated pipe 20.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4 together, a 4K neck tube detection device includes a first flange 1 and a second flange 2 that are arranged at intervals, the first flange 1 and the second flange 2 are fixedly connected through a plurality of support columns 3, and a plurality of support columns 3 are detachably connected with the first flange 1. The support columns 3 are also detachably connected with the second flange 2. The first flange 1 or the second flange 2 is provided with a vent pipe 5. In this embodiment, the number of the support columns 3 is preferably four, and the four support columns 3 are arranged between the first flange 1 and the second flange 2 at intervals; the vent pipe 5 is provided on the first flange 1.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4 together, the first flange 1 and the second flange 2 are provided with mounting holes 16, and both ends of the support column 3 are respectively and fixedly mounted in the mounting holes 16 of the first flange 1 and the mounting holes 16 of the second flange 2. Two ends of the support column 3 are respectively provided with a section of external thread, and two ends of the support column 3 are respectively fixed in the mounting hole 16 of the first flange 1 and the mounting hole 16 of the second flange 2 through two nuts.

As shown in fig. 1, 2 and 4 together, the second flange 2 is provided with a mounting seat 18 adapted to the lower end of the 4K neck tube. The mounting seat 18 comprises a cylinder body 6 which is matched with the inner diameter of a straight pipe 21 at the lower part of the 4K neck pipe, a bevel connection step 7 is arranged on the outer circumference of the cylinder body 6, and the shape of the bevel connection step 7 is matched with the lower end of the 4K neck pipe. When in use, the lower part of the 4K neck pipe upper straight pipe 21 is sleeved on the cylinder 6; the lower end of the straight tube 21 abuts against the bezel step 7.

As shown in fig. 1, 2 and 3 together, the first flange 1 is provided with an annular groove 8, and a sealing element 9 is arranged in the groove 8. The position of the seal 9 corresponds to the position of the upper flange 22. The first flange 1 is provided with a convex positioning step 10, and the positioning step 10 is positioned on the inner side of the groove 8. The positioning step 10 is matched with the inner diameter of the upper end of the 4K neck pipe, and the outer diameter of the positioning step 10 is slightly smaller than the inner diameter of the upper end of the 4K neck pipe. When in use, the upper end of the 4K neck tube is sleeved on the positioning step 10.

As shown in fig. 1, 2 and 5 together, the 4K neck pipe detection device further includes a plurality of transition plates 11 disposed on the side of the first flange 1, and the transition plates 11 are disposed on the side of the first flange 1 near the second flange 2. The plurality of transition plates 11 are detachably mounted on the first flange 1 by fixing members. The fixing piece is an F-shaped clamp or a C-shaped clamp. In this embodiment, preferably, the fixing member is an F clip; the transition plate 11 is a quarter-circular plate. When the novel high-pressure pipe is used, the upper end of the 4K neck pipe is sleeved on the positioning step 10, the upper end of the upper end flange 22 abuts against the lower side face of the first flange 1, the transition plate 11 is arranged on the lower side of the upper end flange 22, and the first flange 1, the upper end flange 22 and the transition plate 11 are fixed together by using F clamps.

As shown in fig. 1, 2 and 6, the 4K neck tube detection device further includes a fixing base 12, a connection hole 15 and a through hole 13 are disposed on the fixing base 12, and one support column 3 is disposed in the through hole 13. In this embodiment, preferably, the fixing base 12 is provided with a protruding connecting portion 14, and the through hole 13 is disposed on the connecting portion 14; the axial direction of the through hole 13 is the same as the extending direction of the support column 3; the axial direction of the connection hole 15 is perpendicular to the extending direction of the support column 3. The number of the fixing seats 12 and the number of the support columns 3 are four, each fixing seat 12 is provided with a through hole 13, and each through hole 13 is internally provided with a support column 3. When the 4K neck tube detection device is used, the fixing seat 12 has a supporting effect on the 4K neck tube, the support column 3 penetrates through the through hole 13 on the fixing seat 12, and twisting deformation of the 4K neck tube can be prevented.

As shown in fig. 8, the 4K neck tube detection device was used for vacuum detection. Firstly, sleeving a straight pipe 21 at the bottom end of a 4K neck pipe on a cylinder 6 of a mounting seat 18, wherein the lower end of the straight pipe 21 is abutted against a bevel step 7; the first flange 1 is mounted above the end face of the upper end flange 22 at the upper end of the 4K neck. Then, the support column 3 is installed between the first flange 1 and the second flange 2, and the first flange 1 and the second flange 2 are fixedly connected. When the support column 3 is installed between the first flange 1 and the second flange 2, a certain pretightening force is applied to the 4K neck pipe, so that the 4K neck pipe is in a micro-compression state. Finally, the transition plate 11 is mounted below the end face of the upper flange 22, and the first flange 1 and the transition plate 11 are fixedly clamped with four F-clamps.

Two or three spot welds are performed between the lower end of the straight pipe 21 and the bevel-mouth step 7 using a welding machine, and the lower end of the straight pipe 21 is fixed to the bevel-mouth step 7. As shown in fig. 8, a gap between the straight pipe 21 and the bevel-mouth step 7 is covered with vacuum sealing mud, and the gap is sealed at a in fig. 8 to prevent air leakage. A helium mass spectrometer leak detector 24 is connected to the vent pipe 5, and then the helium mass spectrometer leak detector 24 is used to pump the interior of the 4K neck pipe to the required vacuum degree, and then the leak rate starts to be detected. After the test is completed, the 4K neck tube detection device is disassembled.

As shown in fig. 9, the 4K neck tube detection device was used for the pressing detection. Firstly, sleeving a straight pipe 21 at the bottom end of a 4K neck pipe on a cylinder 6 of a mounting seat 18, wherein the lower end of the straight pipe 21 is abutted against a bevel step 7; the first flange 1 is mounted above the end face of the upper end flange 22 at the upper end of the 4K neck. Then, the support column 3 is installed between the first flange 1 and the second flange 2, and the first flange 1 and the second flange 2 are fixedly connected. When the support column 3 is installed between the first flange 1 and the second flange 2, a certain pretightening force is applied to the 4K neck pipe, so that the 4K neck pipe is in a micro-compression state. Finally, the transition plate 11 is mounted below the end face of the upper flange 22, and the first flange 1 and the transition plate 11 are fixedly clamped with four F-clamps.

As shown in fig. 9, a gap between the straight pipe 21 and the cylinder 6 is covered with a vacuum sealing paste, and the gap is sealed at a position B in fig. 9 to prevent air leakage. The breather pipe 5 is connected with a tee joint 25, one end of the tee joint 25 is connected with a pressure gauge 26 for reading real-time pressure, and the other end is connected with an angle valve 27, and the angle valve 27 is connected with an inflating device 28 for providing stable pressure. When the pressurizing starts, the pressurizing is slowly performed until the pressure reaches a preset value, the pressurizing is stopped after the pressure reaches the preset value, the pressure maintaining effect is observed after waiting for 20 minutes, and whether the value of the pressure gauge 26 is low or not is observed. After the test is finished, the angle valve 27 is slowly opened, the gas is discharged, the pressurizing test is finished, and the 4K neck tube detection device is disassembled.

In summary, the 4K neck tube detection device adopts a detachable fixed assembly mode, and has firm and stable structure; the device has a good fixing effect on the 4K neck tube, is suitable for vacuumizing and pressing two detection items, cannot cause the deformation of the bellows in the 4K neck tube in the detection process, and has the advantages of convenience in detection, high detection efficiency and the like.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A4K neck pipe detection device, its characterized in that: the flange comprises a first flange (1) and a second flange (2) which are arranged at intervals, wherein the first flange (1) and the second flange (2) are fixedly connected through a plurality of support columns (3), and the support columns (3) are detachably connected with the first flange (1); a mounting seat (18) which is matched with the lower end of the 4K neck pipe is arranged on the second flange (2); the mounting seat (18) comprises a cylinder body (6) which is matched with the inner diameter of the lower part of the 4K neck pipe, a bevel connection step (7) is arranged on the outer circumference of the cylinder body (6), and the bevel connection step (7) is matched with the lower end of the 4K neck pipe.

2. The 4K neck detection device of claim 1, wherein: the first flange (1) is provided with a groove (8), and a sealing piece (9) is arranged in the groove (8).

3. The 4K neck detection device of claim 1, wherein: the first flange (1) is provided with a convex positioning step (10), and the positioning step (10) is matched with the inner diameter of the upper end of the 4K neck pipe.

4. The 4K neck detection device of claim 1, wherein: the flange structure further comprises a plurality of transition plates (11) arranged on the side part of the first flange (1), and the plurality of transition plates (11) are detachably arranged on the first flange (1) through fixing pieces.

5. The 4K neck detection device of claim 1, wherein: the fixing seat (12) is further included, a connecting hole (15) and a through hole (13) are formed in the fixing seat (12), and one supporting column (3) is arranged in the through hole (13).

6. The 4K neck tube detection device of claim 5, wherein: the fixing seat (12) is provided with a protruding connecting part (14), and the through hole (13) is arranged on the connecting part (14); the axial direction of the through hole (13) is the same as the extending direction of the support column (3); the axial direction of the connecting hole (15) is perpendicular to the extending direction of the support column (3).

7. The 4K neck detection device according to any one of claims 1 to 6, wherein: the mounting holes (16) are formed in the first flange (1) and the second flange (2), and two ends of the support column (3) are fixedly mounted in the mounting holes (16) of the first flange (1) and the mounting holes (16) of the second flange (2) respectively.

8. The 4K neck detection device of claim 7, wherein: both ends of the support column (3) are respectively provided with an external thread section, and both ends of the support column (3) are respectively fixed in the mounting hole (16) of the first flange (1) and the mounting hole (16) of the second flange (2) through two nuts (17).

9. The 4K neck detection device according to any one of claims 1 to 6, wherein: and a vent pipe (5) is arranged on the first flange (1) or the second flange (2).