Liquid-helium-free open type nuclear magnetic resonance superconducting magnet system

Abstract

The utility model relates to a liquid-helium-free open type nuclear magnetic resonance superconducting magnet system which comprises an open type main body and a low-temperature superconducting device, comprising a mounting space, and a low-temperature superconducting device is mounted in the mounting space of the open main body; the low-temperature superconducting device comprises a superconducting magnet installed on the upper inner wall of the installation space and a superconducting magnet installed on the lower inner wall of the installation space, the superconducting magnet is refrigerated through an ultralow-temperature refrigerator, a 45K cold shield and a 4K superconducting coil in the superconducting magnet are suspended through a pull rod and a supporting piece, risks caused by magnet quenching do not exist, and the service life of the superconducting magnet is prolonged. And a heat sink (heat cut-off) effect is directly achieved, so that the heat leakage rate is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of nuclear magnetic resonance imaging, especially to a liquid-helium-free open nuclear magnetic resonance superconducting magnet system. BACKGROUND

[0002] Magnetic resonance imaging (MRI) is a non-invasive imaging mode that can distinguish various objects based on inherent components in the object, and is also an imaging technology that can provide one-dimensional, two-dimensional or three-dimensional imaging of the object.

[0003] In the prior art, such as the documents of CN210690797U nuclear magnetic resonance equipment, CN106373699A nuclear magnetic resonance imaging device and its superconducting coil (24) skeleton, CN111292915A nuclear magnetic resonance imaging superconducting magnet for extremity imaging, and CN102136337A high magnetic field and high uniformity nuclear magnetic resonance superconducting magnet system disclosed by Chinese patents, a cylindrical superconducting magnetic resonance is used, which cannot be used for scanning patients with claustrophobia, and cannot be used for real-time scanning imaging intervention surgery under magnetic resonance guidance. In the above-mentioned technology, the superconducting magnet is surrounded by a liquid helium device on the cylinder to realize low-temperature superconducting, which leads to a large application of liquid helium resources. Moreover, the liquid helium magnet is easy to lose superconductivity, and the liquid helium is easy to gasify, which makes the sealed superconducting superconducting coil (24) container become a container with a huge pressure instantaneously, which has a safety hazard, and the gaseous helium gas is not reversible. A large amount of liquid helium needs to be added for refrigeration again.

[0004] In addition, CN103337331A low-temperature container pull rod suitable for nuclear magnetic resonance device disclosed by Chinese patent is provided to prevent the heat of the high-temperature end from being conducted to the low-temperature area after the pull rod is connected with the high-temperature shell in the cylindrical low-temperature superconducting magnet. Therefore, a heat sink device is arranged on the high-temperature section of the pull rod, which leads to high production and manufacturing cost of the equipment, and is not convenient to install. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the technical defects of the above-mentioned technology and designs a liquid-helium-free open nuclear magnetic resonance superconducting magnet system.

[0006] The liquid-helium-free open nuclear magnetic resonance superconducting magnet system designed by the utility model comprises an open main body and a low-temperature superconducting device.

[0007] The open main body comprises a mounting space, and the low-temperature superconducting device is installed in the mounting space.

[0008] The low-temperature superconducting device comprises a 300K container layer, a 45K cold shield layer accommodated in the 300K container layer, and two coil skeletons and a cold lead frame accommodated in the 45K cold shield layer, a super-low-temperature refrigerator is mounted on the 300K container layer, and a gap is formed between the inner wall of the 300K container layer and the outer wall of the 45K cold shield layer, the two coil skeletons are in contact with the cold lead frame, and superconducting coils are wound on the two coil skeletons to form two 4K low-temperature superconducting magnets.

[0009] The 300K container layer comprises an imaging space, a first vacuum accommodating cavity located above the imaging space, and a second vacuum accommodating cavity located below the imaging space.

[0010] The 45K cold shield layer comprises a first accommodating part accommodated in the first vacuum accommodating cavity and a second accommodating part accommodated in the second vacuum accommodating cavity, the two coil skeletons are accommodated in the vacuum cavities of the first accommodating part and the second accommodating part respectively, and the cold lead frame is in contact with the two coil skeletons respectively.

[0011] The first-stage cold head of the super-low-temperature refrigerator is located between the 300K container layer and the 45K cold shield layer and is in contact with the outer wall of the 45K cold shield layer through a cold lead, and the second-stage cold head of the super-low-temperature refrigerator is located in the 45K cold shield layer and is in contact with the cold lead frame.

[0012] A first support and a plurality of first pull rods are arranged in the first channel of the first accommodating part, one end of each first pull rod is connected with the first support, the other end of each first pull rod penetrates through the first channel wall surface of the first accommodating part and is connected with one coil skeleton, so that a gap is formed between the outer wall of the one coil skeleton and the inner wall of the first accommodating part, and a gap is formed between the outer wall of the first support and the first channel wall surface of the first accommodating part.

[0013] A second support and a plurality of second pull rods are arranged in the second channel of the second accommodating part, one end of each second pull rod is connected with the second support, the other end of each second pull rod penetrates through the second channel wall surface of the second accommodating part and is connected with the other coil skeleton, so that a gap is formed between the outer wall of the other coil skeleton and the inner wall of the second accommodating part, and a gap is formed between the outer wall of the second support and the second channel wall surface of the second accommodating part.

[0014] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system described above, mounting holes are formed in the lower side of the first vacuum accommodating cavity and the upper side of the second vacuum accommodating cavity, and a pole head is sealingly mounted in each mounting hole.

[0015] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system described above, a support step is formed on the inner wall of each mounting hole, the edge of the pole head is fixed on the support step, and a sealing member is arranged between the pole head and the support step.

[0016] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, upper sides of the first vacuum accommodating cavities and lower sides of the second vacuum accommodating cavities are respectively formed with through holes, upper inner walls and lower inner walls of the installation spaces are respectively formed with protrusions penetrating in the through holes, one protrusion is fixedly connected with the first support, the other protrusion is fixedly connected with the second support, and inner openings of the through holes are respectively formed with protrusions.

[0017] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, outer walls of the two coil skeletons are respectively formed with winding grooves, and the superconducting coils are wound in the winding grooves.

[0018] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, the first pull rods are obliquely arranged and respectively include first hollow tubes and second hollow tubes, so that one end of the first hollow tube is hingedly connected with the upper part of the coil skeleton in the first accommodating part, and the other end is hingedly connected with the lower end of the first support; one end of the second hollow tube is hingedly connected with the lower part of the coil skeleton in the first accommodating part, and the other end is hingedly connected with the upper end of the first support.

[0019] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, the second pull rods are obliquely arranged and respectively include third hollow tubes and fourth hollow tubes, so that one end of the third hollow tube is hingedly connected with the upper part of the coil skeleton in the second accommodating part, and the other end is hingedly connected with the lower end of the second support; one end of the fourth hollow tube is hingedly connected with the lower part of the coil skeleton in the second accommodating part, and the other end is hingedly connected with the upper end of the second support.

[0020] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, inner walls of the first passages of the first accommodating parts are formed with first mounting seats and second mounting seats, the first hollow tubes penetrate in the first mounting seats, and the second hollow tubes penetrate in the second mounting seats.

[0021] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, inner walls of the second passages of the second accommodating parts are formed with third mounting seats and fourth mounting seats, the third hollow tubes penetrate in the third mounting seats, and the fourth hollow tubes penetrate in the fourth mounting seats.

[0022] According to the liquid-helium-free open nuclear magnetic resonance superconducting magnet system, the first hollow tubes, the second hollow tubes, the third hollow tubes and the fourth hollow tubes are made of carbon fiber material or glass fiber material.

[0023] The utility model discloses a liquid helium open type nuclear magnetic resonance superconducting magnet system, and has the following beneficial effects compared with the prior art:

[0024] 1、 the utility model discloses a magnet cooling mode of liquid helium, and the superconducting coil does not need to be wrapped in the closed liquid helium pressure container, greatly reduces the manufacturing difficulty and cost of 4K part, and there is no risk of magnet quenching.

[0025] 2、 the utility model discloses can effectively reduce the dependence of medical institutions to liquid helium.

[0026] 3、 the utility model discloses the installation of pole head and 300K container layer and the installation of support piece and 300K container layer all adopt sealing piece sealing installation, so that compared with the traditional welding mode, the 300K container layer simplifies the manufacturing process, and repeatedly dismounting can be achieved, and internal parts are convenient to replace.

[0027] 4、 the utility model discloses the structure form of open type main part as iron ore, so that the superconducting coil current efficiency is greatly improved, and the superconducting coil structure is greatly simplified, the magnet manufacturing cost is greatly reduced, and the magnetic field uniformity can be adjusted through pole head compensation;The rigidity of iron ore makes the whole magnet have good strength, and the 300K container layer is directly fixed on the iron ore, so it is not necessary to support the 300K container layer separately.

[0028] 5、 the utility model discloses that the traditional cylindrical superconducting magnetic resonance causes the claustrophobic patient to be unable to carry out scanning operation, so the main part is arranged as an open type main part, and is in " " type, so that it has very good openness, so that the claustrophobic patient can also be normally scanned, and the real-time scanning imaging intervention operation under the guidance of magnetic resonance can be carried out.

[0029] 6、 the utility model discloses that the pull rod adopts low thermal conductivity high-strength carbon fiber material, and the superconducting coil on the 4K low-temperature superconducting magnet and the 45K cold screen layer adopt the mode of sharing the same pull rod, wherein the pull rod is an elongated hollow tube structure, so that the heat leakage rate of the pull rod is reduced by at least 50%.

[0030] 7、 the superconducting coil on the 4K low-temperature superconducting magnet and the 45K cold screen layer share a pull rod, so that the position where the 45K cold screen and the pull rod are fixed directly plays the role of heat sink (heat cutoff), solving the technical problems that the traditional process needs to make a heat sink separately, resulting in high equipment production and manufacturing cost, and inconvenient installation. DRAWINGS

[0031] Figure 1 It is whole structure schematic diagram;

[0032] Figure 2 It is whole structure cross section view (one);

[0033] Figure 3 It is the sectional view of the overall structure (II);

[0034] Figure 4 It is the schematic diagram of the structure of the 300K container layer;

[0035] Figure 5 It is the schematic diagram of the structure of the 45K cold shield layer;

[0036] Figure 6 It is the schematic diagram of the structure of the combination of the 4K low-temperature superconducting magnet and the cold conduction frame;

[0037] Figure 7 It is the schematic diagram of the structure where the hollow tube is arranged around the support;

[0038] Figure 8 It is the schematic diagram of the structure where the first hollow tube and the second hollow tube are arranged staggeredly;

[0039] Figure 9 It is the schematic diagram of the structure where the third hollow tube and the fourth hollow tube are arranged staggeredly. Specific implementation manners

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art shall fall within the protection scope of the present utility model.

[0041] Embodiment:

[0042] As Figures 1-9 shown, the liquid-helium-free open-type nuclear magnetic resonance superconducting magnet system described in this embodiment includes an open-type main body 1 and a low-temperature superconducting device 2. The open-type main body 1 has a "匚"-shaped structure or a "C"-shaped structure, so that an installation space is formed on the open-type main body 1. The low-temperature superconducting device 2 is installed in the installation space, and the open-type main body 1 serves as the iron yoke of the superconducting magnet system.

[0043] The low-temperature superconducting device 2 comprises a 300K container layer 21, a 45K cold shield layer 22 accommodated in the 300K container layer 21, and two coil skeletons 23 and a cold lead frame 25 accommodated in the 45K cold shield layer 22, the 300K container layer 21 and the 45K cold shield layer 22 also have a "H" type structure, and the volume of the 45K cold shield layer 22 is smaller than that of the 300K container layer 21, a convex part is formed between the longitudinal part and the upper transverse part of the 300K container layer 21, the outer wall of the convex part is provided with a super-low-temperature refrigerator 31, the outer wall of the convex part and the super-low-temperature refrigerator 31 are sealed by a sealing ring, and there is a gap between the inner wall of the 300K container layer 21 and the outer wall of the 45K cold shield layer 22, the two coil skeletons 23 are in contact with and mechanically connected to the cold lead frame 25, the two ends of the cold lead frame 25 are respectively provided with wire passing holes 251 for the wires of the superconducting coils 24 to pass through, the outer walls of the two coil skeletons 23 are respectively provided with winding grooves 231, and the superconducting coils 24 are respectively wound in the winding grooves 231 of the two coil skeletons 23 to form two 4K low-temperature superconducting magnets, the 300K container layer 21 comprises an imaging space, a first vacuum accommodating cavity 211 located above the imaging space, and a second vacuum accommodating cavity 212 located below the imaging space, the first vacuum accommodating cavity 211 is formed in the upper transverse part of the 300K container layer 21, the second vacuum accommodating cavity 212 is formed in the lower transverse part of the 300K container layer 21, and the winding grooves 231 are arranged so that the superconducting coils 24 can be positioned.

[0044] The 45K cold shield layer 22 comprises a first accommodating part 221 accommodated in the first vacuum accommodating cavity 211 and a second accommodating part 222 accommodated in the second vacuum accommodating cavity 212, the two coil skeletons 23 are respectively accommodated in the vacuum cavities of the first accommodating part 221 and the second accommodating part 222, and the cold lead frame 25 is in contact with and mechanically connected to the two coil skeletons 23; the two coil skeletons 23 are copper skeletons and have a ring structure, and the first accommodating part 221 and the second accommodating part 222 also have a ring structure.

[0045] The first cold head 311 of the super-low-temperature refrigerator 31 is located between the 300K container layer 21 and the 45K cold shield layer 22, is in contact with and mechanically connected to the outer wall of the 45K cold shield layer 22 through a cold lead 217, and is located in the inner cavity formed by the convex part, the cold lead 217 is a copper sleeve, the copper sleeve is welded and fixed on the through hole of the 45K cold shield layer 22, the lower end of the first cold head 311 of the super-low-temperature refrigerator 31 is located in the copper sleeve, and the outer wall of the first cold head 311 is attached to the copper sleeve; the second cold head 312 of the super-low-temperature refrigerator 31 is located in the 45K cold shield layer 22 and is in contact with and mechanically connected to the cold lead frame 25 after penetrating the copper sleeve and the through hole; the second cold head 312 is in contact with the cold lead frame 25 after penetrating the copper sleeve and the through hole, and the cold lead frame 25 is a copper frame, and the structure of the cold lead frame 25 promotes the 45K cold shield layer 22 to form a 45K cold shield under the action of the second cold head 312.

[0046] Among the above, the mechanical structure connection can adopt a conventional welding fixed connection and the like.

[0047] The first channel 223 of the first accommodating part 221 is provided with a first support 27 and a plurality of first pull rods 29, one end of the first pull rod 29 is connected with the first support 27, the other end penetrates the wall surface of the first channel 223 of the first accommodating part 221 and is connected with a coil framework 23, so that there is a spacing between the outer wall of the coil framework 23 and the inner wall of the first accommodating part 221, and there is a spacing between the outer wall of the first support 27 and the wall surface of the first channel 223 of the first accommodating part 221; wherein the superconducting coil 24 on the 4K low-temperature superconducting magnet and the 45K cold screen are composed of a 45K cold screen layer 22 and share a pull rod, so that the position where the 45K cold screen is fixed with the pull rod directly plays a heat sink heat cutting role, and the number of pull rods used can be reduced, the cross section of the pull rod is reduced, the heat leakage rate is reduced, and the superconducting imaging effect of the nuclear magnetic resonance equipment is better.

[0048] The second channel 224 of the second accommodating part 222 is provided with a second support 28 and a plurality of second pull rods 30, one end of the second pull rod 30 is connected with the second support 28, the other end penetrates the wall surface of the second channel 224 of the second accommodating part 222 and is connected with another coil framework 23, so that there is a spacing between the outer wall of the other coil framework 23 and the inner wall of the second accommodating part 222, and there is a spacing between the outer wall of the second support 28 and the wall surface of the second channel 224 of the second accommodating part 222; wherein the superconducting coil 24 on the 4K low-temperature superconducting magnet and the 45K cold screen are composed of a 45K cold screen layer 22 and share a pull rod, so that the position where the 45K cold screen is fixed with the pull rod directly plays a heat sink heat cutting role, and the number of pull rods used can be reduced, the cross section of the pull rod is reduced, the heat leakage rate is reduced, and the superconducting imaging effect of the nuclear magnetic resonance equipment is better.

[0049] In the embodiment, the lower side of the first vacuum accommodating cavity 211 and the upper side of the second vacuum accommodating cavity 212 are both formed with mounting holes 213, and each mounting hole 213 is respectively and sealingly mounted with a pole head 26; the inner wall of each mounting hole 213 is respectively formed with a support step 214, the edge of the pole head 26 is fixed on the support step 214 in cooperation, and a sealing element is arranged between the pole head 26 and the support step 214; the pole head 26 is composed of a silicon steel sheet layer and an electrically pure iron layer, the sealing element adopts an O-shaped sealing ring, the support step and the pole head 26 are fixedly connected by bolts, and under the action of the pole head 26, the magnetic field generated by the superconducting magnet is more uniform, the use effect of the nuclear magnetic resonance equipment is improved, the pole head 26 is detachable, so that the maintenance and replacement operation of internal parts are facilitated, and the support step 214 is a ring-shaped step structure.

[0050] In this embodiment, through holes 215 are formed on the upper side of the first vacuum chamber 211 and the lower side of the second vacuum chamber 212. The upper and lower inner walls of the installation space are respectively formed with protrusions 11 passing through each through hole 215. One protrusion 11 is fixedly connected to the first support member 27, and the other protrusion is fixedly connected to the second support member 28. A protrusion 216 is formed on the inner edge of each through hole 215. The lower side of one protrusion 216 is in contact with the first support member 27, and the two are sealed by a first sealing body. The upper side of another protrusion 216 is in contact with the second support member 28, and the two are sealed by a second sealing body. This structural arrangement allows the two support members to be fixed, thus facilitating the suspension of the 45K cold shield layer 22 and the 4K low-temperature superconducting magnet by multiple tie rods. Both sealing bodies also use O-rings, and the protrusions 216 are arranged in a ring shape.

[0051] In this embodiment, several first pull rods 29 are arranged at an angle and include several first hollow tubes 291 and several second hollow tubes 292, such that one end of the first hollow tube 291 is hinged to the upper part of the coil skeleton 23 in the first receiving part 221, and the other end is hinged to the lower end of the first support member 27; one end of the second hollow tube 292 is hinged to the lower part of the coil skeleton 23 in the first receiving part 221, and the other end is hinged to the upper end of the first support member 27; wherein, there are four first hollow tubes 291, and the four first hollow tubes 291 are in an inclined and staggered state, and the four first mounting positions 101 on the upper inner wall of the coil skeleton 23 in the first receiving part 221 for hinged connection of the first hollow tubes 291 are arranged in a ring array; there are also four second hollow tubes 292, and the four second hollow tubes 292 are in an inclined and staggered state, and the lower inner wall of the coil skeleton 23 in the first receiving part 221 is used for hinged connection. The four second mounting positions 102 of the second hollow tube 292 are arranged in a ring array, with each second mounting position 102 located between two adjacent first mounting positions 101. The cross-section of the first support member 27 is "I" shaped, with the lower end of the first support member 27 being a lower disc and the upper end being an upper disc. This arrangement facilitates the staggered arrangement of the first hollow tubes 291 and the second hollow tubes 292 to suspend the 45K cold shield layer 22 and the coil frame 23. The hollow tubes are staggered in a regular pattern, with the staggered angle a between the four first hollow tubes 291 being 90° and the staggered angle b between the four second hollow tubes 292 being 90°. This achieves stable suspension of the 45K cold shield layer 22 and the coil frame 23 with a small number of hollow tubes, further significantly reducing the heat leakage rate and making assembly quick. When connecting with hinges, the connecting frame is fixed to the coil frame 23 and the first support member 27 with bolts, and then the two ends of the hollow tubes are looped onto the crossbar of the connecting frame.

[0052] Several second pull rods 30 are arranged at an angle and each includes several third hollow tubes 301 and several fourth hollow tubes 302, such that one end of the third hollow tube 301 is hinged to the upper part of the coil frame 23 in the second receiving part 222, and the other end is hinged to the lower end of the second support member 28; one end of the fourth hollow tube 302 is hinged to the lower part of the coil frame 23 in the second receiving part 222, and the other end is hinged to the upper end of the second support member 28; wherein, the third hollow tube 301 The coil frame 23 within the second receiving portion 222 has four third hollow tubes 301 arranged in an inclined, staggered configuration. The four third mounting positions 103 on the upper inner wall of the coil frame 23 for hinged connection of the third hollow tubes 301 are arranged in a ring array. Similarly, the coil frame 23 within the second receiving portion 222 also has four fourth hollow tubes 302 arranged in an inclined, staggered configuration. The four fourth mounting positions 104 on the lower inner wall of the coil frame 23 within the second receiving portion 222 for hinged connection of the fourth hollow tubes 302 are arranged in a ring array. Each third mounting position 103 is located between two adjacent fourth mounting positions 104; the cross-section of the second support member 28 is in the shape of an "I", and the lower end of the second support member 28 is a lower disc, and the upper end is an upper disc. Its arrangement facilitates the staggered arrangement of the third hollow tube 301 and the fourth hollow tube 302 to suspend the 45K cold shield layer 22 and the coil frame 23. The hollow tubes are staggered in a regular pattern, that is, the staggered angle c between the four third hollow tubes 301 is 90°, and the staggered angle d between the four fourth hollow tubes 302 is 90°. This achieves stable suspension of the 45K cold shield layer 22 and the coil frame 23 with a small number of hollow tubes, further significantly reducing the heat leakage rate and making assembly quick. When the hinge is connected, the connecting frame is fixed to the coil frame 23 and the first support member 27 by bolts, and then the two ends of the hollow tube are looped onto the crossbar of the connecting frame.

[0053] In the above, the first hollow tube 291, the second hollow tube 292, the third hollow tube 301 and the fourth hollow tube 302 are all made of carbon fiber or glass fiber to achieve low thermal conductivity.

[0054] The pull rod of this utility model is made of high-strength carbon fiber material with low thermal conductivity, and the superconducting coil on the 4K low-temperature superconducting magnet and the 45K cold screen (composed of 45K cold screen layer) share the same pull rod. The pull rod is a slender hollow tube structure, which reduces the heat leakage rate of the pull rod by at least 50%.

[0055]

[0056] TL and TH represent the low-temperature end temperature and high-temperature end temperature of the tie rod, respectively; A and L represent the cross-sectional area and effective thermal conductivity length of the tie rod; and λ(T) represents the thermal conductivity of the tie rod.

[0057] For example, TH=300K, TL=45K, thermal conductivity λ=5W / mK Q=λ(TH-TL)A / L / 1000, the railing diameter D=8mm, length L=300mm, a single rod Q=5*255*πD² / 4 / 300 / 1000=0.213W can be obtained, if the traditional way of rod is used, 8 upper and 8 lower, 45K to 300K rod heat loss is 0.213W*16=3.4W, if the way described in the embodiment is used, the 45K rod is saved, and the heat loss is reduced by 0.213W*8=1.7W. As can be seen from the above, the rods between 45K and 300K are saved in the embodiment, so that the system heat loss is greatly reduced

[0058] The main purpose is to reduce the heat loss of the 45K cold screen, thereby reducing the load of the primary cold head. Since the primary cold head and the secondary cold head have specified rated refrigeration power, the heat loss of the primary and secondary cold heads cannot exceed the rated power, otherwise the system cannot maintain balance in cold state.

[0059] Preferably, the inner wall of the first channel 223 of the first containing portion 221 forms a plurality of first mounting seats 225 and a plurality of second mounting seats 226, the first hollow pipe 291 is arranged in the first mounting seat 225, and the second hollow pipe 292 is arranged in the second mounting seat 226; the inner wall of the second channel 224 of the second containing portion 222 forms a plurality of third mounting seats 227 and a plurality of fourth mounting seats 228, the third hollow pipe 301 is arranged in the third mounting seat 227, and the fourth hollow pipe 302 is arranged in the fourth mounting seat 228; the inclination angle of the mounting seat is arranged according to the inclination angle of each hollow pipe, a limiting body is formed on the hollow pipe, and the limiting body is limited at the port of the mounting seat; the mounting seat can support the hollow pipe and keep the hollow pipe stable.

[0060] The utility model is not limited to the above-mentioned best implementation, anyone can draw other various forms of products under the inspiration of the utility model, but no matter make any change in its shape or structure, if the same or similar technical scheme is used, it falls within the protection scope of the utility model.

Claims

1. A liquid-helium-free open nuclear magnetic resonance superconducting magnet system, characterized by, The open body (1) and the low-temperature superconducting device (2); The open body (1) comprises a mounting space, and the low-temperature superconducting device (2) is mounted in the mounting space; The low-temperature superconducting device (2) comprises a 300K container layer (21), a 45K cold shield layer (22) accommodated in the 300K container layer (21), and two coil skeletons (23) and a cold lead frame (25) accommodated in the 45K cold shield layer (22), a super-low-temperature refrigerator (31) is mounted on the 300K container layer (21), and a gap is formed between the inner wall of the 300K container layer (21) and the outer wall of the 45K cold shield layer (22), the two coil skeletons (23) are in contact with the cold lead frame (25), and superconducting coils (24) are wound on the two coil skeletons (23) respectively to form two 4K low-temperature superconducting magnets; The 300K container layer (21) comprises an imaging space, a first vacuum accommodating cavity (211) located above the imaging space, and a second vacuum accommodating cavity (212) located below the imaging space; The 45K cold shield layer (22) comprises a first accommodating part (221) accommodated in the first vacuum accommodating cavity (211) and a second accommodating part (222) accommodated in the second vacuum accommodating cavity (212), the two coil skeletons (23) are accommodated in the vacuum cavities of the first accommodating part (221) and the second accommodating part (222) respectively, and the cold lead frame (25) is in contact with the two coil skeletons (23) respectively; A primary cold head (311) of the super-low-temperature refrigerator (31) is located between the 300K container layer (21) and the 45K cold shield layer (22) and is in contact with the outer wall of the 45K cold shield layer (22) through a cold lead (217); and a secondary cold head (312) of the super-low-temperature refrigerator (31) is located in the 45K cold shield layer (22) and is in contact with the cold lead frame (25); A first support (27) and a plurality of first pull rods (29) are arranged in a first channel (223) of the first accommodating part (221), one end of each first pull rod (29) is connected with the first support (27), the other end of each first pull rod (29) penetrates through the wall surface of the first channel (223) of the first accommodating part (221) and is connected with one coil skeleton (23), so that a gap is formed between the outer wall of the one coil skeleton (23) and the inner wall of the first accommodating part (221), and a gap is formed between the outer wall of the first support (27) and the wall surface of the first channel (223) of the first accommodating part (221); A second support (28) and a plurality of second pull rods (30) are arranged in a second channel (224) of the second accommodating part (222), one end of each second pull rod (30) is connected with the second support (28), the other end of each second pull rod (30) penetrates through the wall surface of the second channel (224) of the second accommodating part (222) and is connected with the other coil skeleton (23), so that a gap is formed between the outer wall of the other coil skeleton (23) and the inner wall of the second accommodating part (222), and a gap is formed between the outer wall of the second support (28) and the wall surface of the second channel (224) of the second accommodating part (222).

2. The liquid-helium-free open nuclear magnetic resonance superconducting magnet system of claim 1, wherein, The lower side of the first vacuum accommodating cavity (211) and the upper side of the second vacuum accommodating cavity (212) are formed with mounting holes (213), and the pole heads (26) are respectively sealingly mounted in the mounting holes (213).

3. The liquid-helium-free open nuclear magnetic resonance superconducting magnet system of claim 2, wherein, The inner walls of the mounting holes (213) are respectively formed with support steps (214), the edges of the pole heads (26) are fixedly fitted on the support steps (214), and sealing members are arranged between the pole heads (26) and the support steps (214).

4. The liquid-helium-free open nuclear magnetic resonance superconducting magnet system of claim 1, wherein, The upper side of the first vacuum accommodating cavity (211) and the lower side of the second vacuum accommodating cavity (212) are respectively formed with through holes (215), the upper inner wall and the lower inner wall of the mounting space are respectively formed with protrusions (11) penetrating through the through holes (215), one protrusion (11) is fixedly connected with the first support member (27), the other protrusion is fixedly connected with the second support member (28), and the inner openings of the through holes (215) are respectively formed with protrusions (216) upward; the lower side of one protrusion (216) is in abutment with the first support member (27), and the two are sealed by a first sealing body; the upper side of the other protrusion (216) is in abutment with the second support member (28), and the two are sealed by a second sealing body.

5. The liquid-helium-free open nuclear magnetic resonance superconducting magnet system of claim 1, wherein, The outer walls of the two coil frames (23) are respectively formed with winding grooves (231), and the superconducting coils (24) are wound in the winding grooves (231).

6. The liquid-helium-free open nuclear magnetic resonance superconducting magnet system of claim 1, wherein, The first pull rods (29) are obliquely arranged and respectively include first hollow tubes (291) and second hollow tubes (292), so that one end of the first hollow tube (291) is hingedly connected with the upper part of the coil frame (23) in the first accommodating portion (221), and the other end is hingedly connected with the lower end of the first support member (27); one end of the second hollow tube (292) is hingedly connected with the lower part of the coil frame (23) in the first accommodating portion (221), and the other end is hingedly connected with the upper end of the first support member (27).

7. The liquid-helium-free open NMR superconducting magnet system of claim 6, wherein, The second pull rods (30) are obliquely arranged and respectively include third hollow tubes (301) and fourth hollow tubes (302), so that one end of the third hollow tube (301) is hingedly connected with the upper part of the coil frame (23) in the second accommodating portion (222), and the other end is hingedly connected with the lower end of the second support member (28); one end of the fourth hollow tube (302) is hingedly connected with the lower part of the coil frame (23) in the second accommodating portion (222), and the other end is hingedly connected with the upper end of the second support member (28).

8. The liquid-helium-free open NMR superconducting magnet system of claim 7, wherein, The inner wall of the first channel (223) of the first accommodating portion (221) is formed with first mounting seats (225) and second mounting seats (226), the first hollow tube (291) penetrates through the first mounting seat (225), and the second hollow tube (292) penetrates through the second mounting seat (226).

9. The liquid-helium-free open NMR superconducting magnet system of claim 8, wherein, The inner wall of the second channel (224) of the second accommodating portion (222) is formed with third mounting seats (227) and fourth mounting seats (228), the third hollow tube (301) penetrates through the third mounting seat (227), and the fourth hollow tube (302) penetrates through the fourth mounting seat (228).

10. The liquid-helium-free open nuclear magnetic resonance superconducting magnet system of claim 9, wherein, The first hollow tube (291), the second hollow tube (292), the third hollow tube (301) and the fourth hollow tube (302) are made of carbon fiber material or glass fiber material.

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