CN112986877A - Cold fluid conveying pipeline structure, low-temperature coil cooling device and magnetic resonance equipment - Google Patents
Cold fluid conveying pipeline structure, low-temperature coil cooling device and magnetic resonance equipment Download PDFInfo
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- CN112986877A CN112986877A CN202110298483.8A CN202110298483A CN112986877A CN 112986877 A CN112986877 A CN 112986877A CN 202110298483 A CN202110298483 A CN 202110298483A CN 112986877 A CN112986877 A CN 112986877A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34015—Temperature-controlled RF coils
- G01R33/3403—Means for cooling of the RF coils, e.g. a refrigerator or a cooling vessel specially adapted for housing an RF coil
Abstract
The application relates to a cold fluid conveying pipeline structure, a low-temperature coil cooling device and a magnetic resonance device. The cold fluid inlet pipe is used for conveying cold fluid to a load for heat exchange. And the cold fluid return pipe is used for conveying the cold fluid after heat exchange to the cold fluid cavity. The cold shield forms a cavity. The cold fluid inlet pipe is arranged in the cavity. Above-mentioned cold fluid pipeline structure advances the pipe overcoat at cold fluid and establishes cold screen to utilize cold fluid return pipe to cool down to cold screen, make external radiation can not direct action cold fluid advance the pipe, greatly reduced cold fluid advances the heat leakage of pipe, and then has improved the cooling effect to the load.
Description
Technical Field
The application relates to the technical field of medical instruments, in particular to a cold fluid conveying pipeline structure, a low-temperature coil cooling device and magnetic resonance equipment.
Background
Magnetic Resonance Imaging (MRI) techniques have a low signal-to-noise ratio compared to other detection techniques. When the magnetic resonance technique is used for small animal imaging, a higher SNR is generally required because the volume of the subject is small and the resolution is required to be high. Therefore, how to improve the signal-to-noise ratio of the magnetic resonance imaging technology is a permanent proposition. The magnetic resonance signal is a very weak induced current detected by the coil, and either reducing the thermal noise of the background current or increasing the induced current increases the signal-to-noise ratio. Under the guidance of the theory, a low-temperature probe is developed, so that the signal-to-noise ratio is improved to a certain extent.
The low-temperature probe needs to use the cold helium to refrigerate the coil, the cold helium is transmitted through a vacuum pipeline, for example, 30K cold helium is transmitted to the coil position through the vacuum pipeline, the cold helium and the coil exchange heat to realize the cooling of the coil, and then the cold helium after heat exchange is transmitted back to the refrigerating mechanism through the vacuum pipeline again to be cooled again. Because the outer pipeline of the vacuum pipeline is generally at normal temperature, namely about 300K, the vacuum pipeline can be influenced by heat radiation, so that the temperature is increased, and the refrigeration effect of the coil is influenced.
Disclosure of Invention
Based on this, this application provides a cold fluid pipeline structure, low temperature coil cooling device and magnetic resonance equipment, utilizes cold fluid return pipe is right the cold screen cools down for external radiation can not direct action cold fluid admission pipe, and greatly reduced cold fluid admission pipe leaks heat, and then has improved the cooling effect to the load.
The application provides a cold fluid conveying pipeline structure, includes:
a cold shield forming a cavity;
the cold fluid inlet pipe is arranged in the cavity of the cold shield and used for conveying cold fluid to a load for heat exchange;
and the cold fluid return pipe is used for conveying the cold fluid after heat exchange back.
In one embodiment, the cold fluid return pipe and the cold fluid inlet pipe are arranged in parallel, the cold screen is sleeved outside the cold fluid inlet pipe, and a gap is formed between the cold screen and the cold fluid inlet pipe.
In one embodiment, the cold shield is disposed proximate to the cold fluid return.
In one embodiment, the cold shield is in contact with the cold fluid return.
In one embodiment, the side of the cold shield in contact with the cold fluid return is connected by a highly thermally conductive material.
In one embodiment, the side of the cold shield in contact with the cold fluid return pipe is connected with the cold fluid return pipe by welding or bonding; the welding or bonding material is high heat conduction material.
In one embodiment, the cold shield material is copper or aluminum.
In one embodiment, the cold fluid inlet pipe and the cold fluid return pipe are both made of stainless steel.
In one embodiment, the cold fluid conveying pipeline structure further comprises an outer pipe, the outer pipe forms a vacuum cavity, and the cold shield, the cold fluid inlet pipe and the cold fluid return pipe are arranged in the vacuum cavity; the outer tube is made of stainless steel.
Based on the same inventive concept, the application provides a low-temperature coil cooling device, which comprises a cold fluid cavity and a cold fluid conveying pipeline structure;
the cold fluid conveying pipeline structure and the cold fluid cavity form a closed structure, and the cold fluid conveying pipeline structure comprises a cold fluid inlet pipe and a cold fluid return pipe;
the closed structure formed by the cold fluid conveying pipeline structure and the cold fluid cavity is used for circulation of cold fluid.
Based on the same inventive concept, the present application provides a magnetic resonance apparatus comprising a coil and the cold fluid conveying pipe structure and/or the cryogenic coil cooling device as described in any one of the above embodiments, the magnetic resonance apparatus further comprising a coil, the cold fluid conveying pipe structure being configured to exchange heat with the coil, and the cryogenic coil cooling device being configured to cool the coil.
The cold fluid conveying pipeline structure comprises a cold fluid inlet pipe, a cold fluid return pipe and a cold screen. The cold fluid inlet pipe is used for conveying cold fluid to a load for heat exchange. And the cold fluid return pipe is used for conveying the cold fluid after heat exchange to the cold fluid cavity. The cold shield forms a cavity. The cold fluid inlet pipe is arranged in the cavity. Above-mentioned cold fluid pipeline structure is in cold fluid advances pipe overcoat and establishes cold screen, and utilizes cold fluid return pipe is right the cold screen is cooled down for external radiation can not direct action cold fluid advances the pipe, and greatly reduced cold fluid advances the heat leakage of pipe, and then has improved the cooling effect to the load.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a cold fluid delivery pipe according to an embodiment of the present application;
FIG. 2 is a cross-sectional view of a cold fluid delivery pipe structure provided in one embodiment of the present application;
fig. 3 is a schematic structural diagram of a cryogenic coil cooling apparatus according to an embodiment of the present application.
Description of the main element reference numerals
10. An outer tube; 20. a cold fluid inlet pipe; 30. a cold fluid return pipe; 40. cooling the screen; 50. a heat insulating layer;
60. a refrigerator, 70, a cold fluid chamber; 80. a cold conductor; 101. a vacuum chamber; 102. a cavity; 110. a magnet; 120. a coil; 130. and a circulating pump.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first acquisition module may be referred to as a second acquisition module, and similarly, a second acquisition module may be referred to as a first acquisition module, without departing from the scope of the present application. The first acquisition module and the second acquisition module are both acquisition modules, but are not the same acquisition module.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Magnetic Resonance Imaging (MRI) technology can directly make cross-sectional, sagittal and coronal slice images, and has become one of the important tools for medical clinical diagnosis and research, especially for the localization of tumors in patients during radiotherapy. The MRI system excites human tissues by emitting electromagnetic waves through the radio frequency coil, generates resonance signals in the human tissues, is received by the receiving coil, and then is sent to the computer system for presentation after signal amplification, filtering and other processing are carried out by the receiving circuit.
The signal-to-noise ratio of the magnetic resonance signal is improved in the prior art by using a cryogenic coil. To maintain the low temperature environment of the coil, it is necessary to refrigerate the coil using cold helium. The cold helium is transmitted to the low-temperature coil through the cold helium inlet pipe, and is transmitted back to the refrigerating mechanism through the cold helium return pipe after heat exchange. Because the outer pipeline of the vacuum pipeline is generally at the normal temperature, namely about 300K, the cold helium inlet pipe and the cold helium return pipe can be influenced by heat radiation to cause temperature rise, and the temperature rise of the cold helium inlet pipe can cause the temperature rise of the low-temperature coil to influence the refrigeration effect of the coil. The application provides a cold fluid conveying pipeline structure in order to overcome the problem that a cold helium inlet pipe is heated under the action of heat radiation and is heated.
Referring to fig. 1, the present application provides a cold fluid conveying pipeline structure. The cold fluid conveying pipeline structure comprises a cold fluid inlet pipe 20, a cold fluid return pipe 30 and a cold screen 40. The cold fluid inlet pipe 20 is used for conveying cold fluid to a load for heat exchange. The cold fluid return pipe 30 is used for conveying the cold fluid after heat exchange to the cold fluid chamber. The cold shield 40 surrounds a cavity 102. The cold fluid inlet pipe 20 is disposed in the cavity 102.
It is understood that the materials and dimensions of the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are not particularly limited, as long as cold fluid can be transported. The cooling fluid may be a gas or a liquid. In one embodiment, the cold fluid may be liquid nitrogen or chilled helium, or the like. The cold helium may be cold helium gas. In one embodiment, the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are made of stainless steel material, which can ensure that the pipeline is not corroded and cracked when the cold fluid is conveyed for a long time. In one embodiment, in order to compensate for thermal stress deformations caused by temperature variations, bellows are mounted on both the cold fluid inlet pipe 20 and the cold fluid return pipe 30.
It is understood that the material and dimensions of the cold shield 40 are not particularly limited. In one embodiment, the cold shield 40 is formed by bending a thin copper plate into a cylindrical shape and welding or riveting.
In one embodiment, the cold fluid return pipe 30 is disposed in parallel with the cold fluid inlet pipe 20, the cold shield 40 is sleeved outside the cold fluid inlet pipe 20, and a gap exists between the cold shield 40 and the cold fluid inlet pipe 20. The cold shield 40 is positioned in close contact with the cold fluid return 30. In this case, the cold shield 40 is arranged concentrically with the cold fluid inlet pipe 20. Optionally, a bracket or other fixing device may be used to fix the cold shield 40 near the cold fluid return 30, so as to cool the cold shield 40 with the cold fluid return 30.
In another embodiment, the cold fluid return pipe 30 is disposed in parallel with the cold fluid inlet pipe 20, the cold shield 40 is sleeved outside the cold fluid inlet pipe 20, and a gap exists between the cold shield 40 and the cold fluid inlet pipe 20. The cold screen 40 is directly arranged in contact with the cold fluid return pipe 30, so that the cold fluid return pipe 30 can be utilized to cool the cold screen 40. In one embodiment, the outer surface of the cold shield 40 is in contact with the cold fluid return 30. Optionally, the side of the cold shield in contact with the cold fluid return is connected by a highly thermally conductive material. Optionally, the cold shield 40 and the cold fluid return pipe 30 are fixed by welding or bonding to ensure a thermal contact area and sufficient heat exchange. In one embodiment, the material for welding and bonding is a high thermal conductivity material with excellent thermal conductivity, for example, a high thermal conductivity welding material may be used for welding or thermal conductive glue bonding.
In one embodiment, the cold fluid conveying piping structure further comprises an outer pipe 10. The outer tube 10 encloses a vacuum chamber 101. The cold shield 40, the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are arranged in the vacuum chamber 101. It is understood that the material and size of the outer tube 10 are not particularly limited as long as they can function to eliminate the convection of gas. In one embodiment, the outer tube 10 is made of stainless steel. In one embodiment, the outer tube 10 is provided with a vacuum draw. Vacuum interlayers are arranged between the outer pipe 10 and the cold shield 40, between the cold shield 40 and the cold fluid inlet pipe 20, between the cold shield 40 and the cold fluid return pipe 30 and between the cold fluid return pipe 30 and the outer pipe 10. In one embodiment, in order to compensate for ambient temperature variation, or due to the cold fluid inlet pipe 20 or the cold fluid return pipe 30 being broken, the low-temperature cold fluid overflows into the vacuum interlayer, thereby causing thermal stress deformation of the outer pipe 10 due to temperature variation, a metal mesh grid may be provided on the outer pipe 10.
The cold fluid conveying pipeline structure comprises an outer pipe 10, a cold fluid inlet pipe 20, a cold fluid return pipe 30 and a cold screen 40. The outer tube 10 encloses a vacuum chamber 101. The cold fluid inlet pipe 20 is used for conveying cold fluid to a load for heat exchange. The cold fluid return pipe 30 is disposed in the vacuum chamber 101, and is used for conveying the cold fluid after heat exchange to the cold fluid chamber. The cold shield 40 is disposed in the vacuum chamber 101, and the cold shield 40 surrounds a cavity 102. The cold fluid inlet pipe 20 is disposed in the cavity 102. The cold fluid conveying pipeline structure arranges the cold fluid inlet pipe 20 and the cold fluid return pipe 30 in the same vacuum outer pipe 10, so that the conveying pipeline structure is compact. Cold fluid advances pipe 20 overcoat and establishes cold screen 40, and utilizes cold fluid return pipe 30 is right cold screen 40 cools down for external radiation can not direct action cold fluid advances pipe 20, and greatly reduced cold fluid advances the heat leakage of pipe 20, and then has improved the cooling effect to the load.
Referring to fig. 2, in one embodiment, the cold fluid transport pipe structure further comprises a thermal insulation layer 50.
The thermal insulation layer 50 is disposed between the cold fluid inlet pipe 20 and the cold shield 40. The cold fluid advances the pipe 20 with set up heat insulation layer 50 between the cold screen 40, guaranteed that the cold fluid has better adiabatic effect when advancing the transportation in the pipe 20 at the cold fluid, further reduced cold fluid and advanced the heat leak of pipe 20, and then improved the cooling effect to the load.
In one embodiment, the thermal insulation layer 50 includes aluminum-plated sheets and fiber barriers, which are alternately arranged. The number of the heat insulating layer 50 is not particularly limited. In one embodiment, the insulation layer 50 may be wrapped around the outer surface of the cold fluid inlet pipe 20.
Referring to fig. 3, the present application provides a cooling apparatus for a low temperature coil. The low-temperature coil cooling device comprises the cold fluid conveying pipeline structure in the embodiment. The cryogenic coil cooling apparatus may also include a refrigerator 60, a cold fluid chamber 70, and a cold conductor 80.
The cold fluid chamber 70 is used for containing cold fluid and is connected with the refrigerator 60. The cold fluid transfer conduit structure is connected to the cold fluid chamber 70. The cold conductor 80 is structurally connected with the cold fluid conveying pipeline. The cold fluid conveying pipeline structure comprises an outer pipe 10, a cold fluid inlet pipe 20, a cold fluid return pipe 30 and a cold screen 40. The outer tube 10 encloses a vacuum chamber 101. The cold fluid inlet pipe 20 is used for conveying cold fluid to the cold guide body 80 for heat exchange. The cold fluid return pipe 30 is disposed in the vacuum chamber 101, and is used for conveying the cold fluid after heat exchange to the cold fluid chamber 70. The cold shield 40 is disposed in the vacuum chamber 101, and the cold shield 40 surrounds a cavity 102. The cold fluid inlet pipe 20 is disposed in the cavity 102.
The cold fluid may be liquid nitrogen or chilled helium, or the like. In one embodiment, liquid nitrogen (77K) is placed in the cold fluid chamber 70 and the closed cold fluid conveying pipe structure, and the circulating pump 130 can circulate the liquid nitrogen in the cold fluid conveying pipe structure, wherein the liquid nitrogen continuously circulates between the cold fluid chamber 70 and the coil 120. The cold fluid chamber 70 is connected with the refrigerator 60, the refrigerator 60 can generate low temperature and cool the liquid nitrogen to low temperature, the coil 120 is cooled to low temperature after the low temperature liquid nitrogen circulates to the coil 120, the liquid nitrogen is also heated, and the heated liquid nitrogen circulates back to the cold fluid chamber 70 and is cooled by the refrigerator 60. Using the cryogenic coil cooling device, liquid nitrogen is permanently enclosed in the cold fluid chamber 70 and the cold fluid conveying piping structure, continuously cooling the coil 120, avoiding liquid nitrogen loss, reducing maintenance difficulty.
In another embodiment, chilled helium is placed in the cold fluid chamber 70 and the closed cold fluid delivery conduit structure, and the circulating pump 130 can circulate the chilled helium in the cold fluid delivery conduit structure, wherein the chilled helium continuously circulates between the cold fluid chamber 70 and the coil 120. The refrigerating machine 60 is connected to the refrigerating machine 60, the refrigerating machine 60 can generate low temperature and cool the helium to low temperature (about 30K), after the low-temperature helium circulates to the coil 120, the coil 120 is cooled to low temperature (for example, below 77K), the temperature of the helium itself is raised (for example, 77K), and the raised helium circulates back to the refrigerating fluid chamber 70 and is cooled by the refrigerating machine 60. With the cryogenic coil cooling device, the cold helium is permanently enclosed in the cold fluid chamber 70 and the cold fluid conveying pipeline structure, and the coil 120 is continuously cooled, so that the loss of the cold helium can be avoided, and the maintenance difficulty is reduced. Furthermore, during the process of returning the chilled helium (77K) to the cold fluid return pipe 30, the cold shield 40 is close to the cold fluid return pipe 30 or in contact with the cold fluid return pipe 30, so that the cold fluid return pipe 30 can continuously cool the cold shield 40, and the cold shield 40 can be maintained at a low temperature of about 80K. The cold shield kept at low temperature has good heat insulation effect on the cold fluid inlet pipe 20 for conveying cold helium (about 30K), and avoids heat radiation loss caused by high temperature (about 300K) outside.
When the coil 120 is cooled, the cold conductor 80 may be disposed in contact with or close to the coil 120. Any existing technique for providing liquid nitrogen may be used, including, but not limited to, physically transferring liquid helium from a storage dewar; cooling the helium stream with a closed cycle refrigerator such as a Gifford-Mcmahon or stirling refrigerator; or cooled using a joule-thomson refrigerator. Liquid nitrogen is stored in the cold fluid chamber 70. In use, the circulation pump 130 circulates liquid nitrogen from the cold fluid delivery conduit structure to a cold conductor 80 located adjacent to the coil 120. The cold conductor 80 is typically a block of thermally conductive material, for example, the cold conductor 80 may be made of a non-metallic material (e.g., Al) with high thermal conductivity2O3) And (4) heating. In one embodiment, the cold fluid delivery conduit structure and cold conductor 80 are enclosed in a cold finger.
It is understood that the material and size of the outer tube 10 are not particularly limited as long as they can function to eliminate the convection of gas. In one embodiment, the outer tube 10 is made of stainless steel. In one embodiment, the outer tube 10 is provided with a vacuum draw. Vacuum interlayers are arranged between the outer pipe 10 and the cold shield 40, between the cold shield 40 and the cold fluid inlet pipe 20, between the cold shield 40 and the cold fluid return pipe 30 and between the cold fluid return pipe 30 and the outer pipe 10. In one embodiment, in order to compensate for ambient temperature variation, or due to the cold fluid inlet pipe 20 or the cold fluid return pipe 30 breaking, the low-temperature cold fluid overflows into the vacuum interlayer, thereby causing the thermal stress deformation of the outer pipe 10 due to temperature variation, a woven mesh of metal may be provided on the outer pipe 10.
It is understood that the materials and dimensions of the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are not particularly limited, as long as cold fluid can be transported. The cooling fluid may be a gas or a liquid. In one embodiment, the cold fluid may be liquid nitrogen or chilled helium, or the like. In one embodiment, the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are made of stainless steel material, which can ensure that the pipeline is not corroded and cracked when the cold fluid is conveyed for a long time. In one embodiment, in order to compensate for thermal stress deformations caused by temperature variations, bellows are mounted on both the cold fluid inlet pipe 20 and the cold fluid return pipe 30.
It is understood that the material and dimensions of the cold shield 40 are not particularly limited. In one embodiment, the cold shield 40 is formed by bending a thin copper plate into a cylindrical shape and welding or riveting.
In one embodiment, the cold fluid return pipe 30 is disposed in parallel with the cold fluid inlet pipe 20, the cold shield 40 is sleeved outside the cold fluid inlet pipe 20, and a gap exists between the cold shield 40 and the cold fluid inlet pipe 20. The cold shield 40 is positioned in close contact with the cold fluid return 30. In this case, the cold shield 40 is arranged concentrically with the cold fluid inlet pipe 20. Optionally, a bracket or other fixing device may be used to fix the cold shield 40 near the cold fluid return 30, so as to cool the cold shield 40 with the cold fluid return 30.
In another embodiment, the cold fluid return pipe 30 is disposed in parallel with the cold fluid inlet pipe 20, the cold shield 40 is sleeved outside the cold fluid inlet pipe 20, and a gap exists between the cold shield 40 and the cold fluid inlet pipe 20. The cold screen 40 is directly arranged in contact with the cold fluid return pipe 30, so that the cold fluid return pipe 30 can be utilized to cool the cold screen 40. In one embodiment, the outer surface of the cold shield 40 is in contact with the cold fluid return 30. Optionally, the cold shield 40 and the cold fluid return pipe 30 are fixed by soldering or bonding to ensure a thermal contact area and sufficient heat exchange.
The cryogenic coil cooling device includes a refrigerator 60, a cold fluid chamber 70, a cold fluid conveying pipe structure, and a cold conductor 80. The cold helium is placed in the cold fluid chamber 70 and the closed cold fluid conveying pipe structure, and the circulating pump 130 can circulate the cold helium in the cold fluid conveying pipe structure, so that the cold helium continuously circulates between the cold fluid chamber 70 and the coil 120. The cold fluid chamber 70 is connected to the refrigerator 60, the refrigerator 60 can generate low temperature and cool the cold helium to low temperature (about 30K), after the low temperature cold helium circulates to the coil 120, the coil 120 is cooled to low temperature (for example, 77K), the cold helium itself is heated (for example, 77K), and the heated cold helium circulates back to the cold fluid chamber 70 and is cooled by the refrigerator 60. With the cryogenic coil cooling device, the cold helium is permanently enclosed in the cold fluid chamber 70 and the cold fluid conveying pipeline structure, and the coil 120 is continuously cooled, so that the loss of the cold helium can be avoided, and the maintenance difficulty is reduced. The cold fluid conveying pipeline structure comprises an outer pipe 10, a cold fluid inlet pipe 20, a cold fluid return pipe 30 and a cold screen 40. The outer tube 10 encloses a vacuum chamber 101. The cold fluid inlet pipe 20 is used for conveying cold fluid to a load for heat exchange. The cold fluid return pipe 30 is disposed in the vacuum chamber 101, and is used for conveying the cold fluid after heat exchange to the cold fluid chamber. The cold shield 40 is disposed in the vacuum chamber 101 adjacent to the cold fluid return 30, and the cold shield 40 surrounds and forms a cavity 102. The cold fluid inlet pipe 20 is disposed in the cavity 102. The cold fluid conveying pipeline structure arranges the cold fluid inlet pipe 20 and the cold fluid return pipe 30 in the same vacuum outer pipe 10, so that the conveying pipeline structure is compact. Cold fluid advances pipe 20 overcoat and establishes cold screen 40, and utilizes cold fluid return pipe 30 is right cold screen 40 cools down for external radiation can not direct action cold fluid advances pipe 20, and greatly reduced cold fluid advances the heat leakage of pipe 20, and then has improved the cooling effect to the load.
The present application provides a magnetic resonance apparatus comprising a coil 120 and a cryogenic coil cooling arrangement as described in any one of the above embodiments for cooling the coil 120. In one embodiment, the magnetic resonance apparatus is a preclinical animal magnetic resonance apparatus. In one embodiment, the magnetic resonance apparatus is an ultra-high field preclinical animal magnetic resonance apparatus, for example, a 9.4T magnetic resonance apparatus.
The magnetic resonance apparatus may further comprise a chamber for housing the coil 120 and a magnet 110. The cryogenic coil cooling device is disposed adjacent to the magnet 110. The magnet 110 is used to generate a magnetic field. The cryogenic coil cooling apparatus includes a refrigerator 60, a cold fluid chamber 70, a cold fluid transfer conduit structure, and a cold conductor 80.
The cold fluid chamber 70 is used for containing cold fluid and is connected with the refrigerator 60. The cold fluid transfer conduit structure is connected to the cold fluid chamber 70. The cold conductor 80 is structurally connected with the cold fluid conveying pipeline. The cold fluid conveying pipeline structure comprises an outer pipe 10, a cold fluid inlet pipe 20, a cold fluid return pipe 30 and a cold screen 40. The outer tube 10 encloses a vacuum chamber 101. The cold fluid inlet pipe 20 is used for conveying liquid nitrogen to the cold guide body 80 for heat exchange. The cold fluid return pipe 30 is disposed in the vacuum chamber 101, and is used for conveying the heat-exchanged liquid nitrogen to the cold fluid chamber 70. The cold shield 40 is disposed in the vacuum chamber 101, and the cold shield 40 surrounds a cavity 102. The cold fluid inlet pipe 20 is disposed in the cavity 102.
The cold helium is placed in the cold fluid chamber 70 and the closed cold fluid conveying pipe structure, and the circulating pump 130 can circulate the cold helium in the cold fluid conveying pipe structure, so that the cold helium continuously circulates between the cold fluid chamber 70 and the coil 120. The cold fluid chamber 70 is connected to the refrigerator 60, the refrigerator 60 can generate low temperature and cool the cold helium to low temperature (about 30K), after the low temperature cold helium circulates to the coil 120, the coil 120 is cooled to low temperature (for example, 77K), the cold helium itself is heated (for example, 77K), and the heated cold helium circulates back to the cold fluid chamber 70 and is cooled by the refrigerator 60. With the cryogenic coil cooling device, the cold helium is permanently enclosed in the cold fluid chamber 70 and the cold fluid conveying pipeline structure, and the coil 120 is continuously cooled, so that the loss of the cold helium can be avoided, and the maintenance difficulty is reduced.
When the coil 120 is cooled, the cold conductor 80 may be disposed in contact with or close to the coil 120. Any existing technique for providing liquid nitrogen may be used, including, but not limited to, physically transferring liquid helium from a storage dewar; cooling the helium stream with a closed cycle refrigerator such as a Gifford-Mcmahon or stirling refrigerator; or cooled using a joule-thomson refrigerator. Liquid nitrogen is stored in the cold fluid chamber 70. In use, the circulation pump 130 circulates liquid nitrogen from the cold fluid delivery conduit structure to a cold conductor 80 located adjacent to the coil 120. The cold conductor 80 is typically a block of thermally conductive material, for example, the cold conductor 80 may be made of a non-metallic material (e.g., Al) with high thermal conductivity2O3) And (4) heating. In one embodiment, the cold fluid delivery conduit structure and cold conductor 80 are enclosed in a cold finger.
It is understood that the material and size of the outer tube 10 are not particularly limited as long as they can function to eliminate the convection of gas. In one embodiment, the outer tube 10 is made of stainless steel. In one embodiment, the outer tube 10 is provided with a vacuum draw. Vacuum interlayers are arranged between the outer pipe 10 and the cold shield 40, between the cold shield 40 and the cold fluid inlet pipe 20, between the cold shield 40 and the cold fluid return pipe 30 and between the cold fluid return pipe 30 and the outer pipe 10. In one embodiment, in order to compensate for ambient temperature variation, or due to the cold fluid inlet pipe 20 or the cold fluid return pipe 30 breaking, the low-temperature cold fluid overflows into the vacuum interlayer, thereby causing the thermal stress deformation of the outer pipe 10 due to temperature variation, a woven mesh of metal may be provided on the outer pipe 10.
It is understood that the materials and dimensions of the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are not particularly limited, as long as cold fluid can be transported. The cold fluid may be liquid nitrogen or cold helium. In one embodiment, the cold fluid inlet pipe 20 and the cold fluid return pipe 30 are made of stainless steel material, which can ensure that the pipeline is not corroded and cracked when the cold fluid is conveyed for a long time. In one embodiment, in order to compensate for thermal stress deformations caused by temperature variations, bellows are mounted on both the cold fluid inlet pipe 20 and the cold fluid return pipe 30.
It is understood that the material and dimensions of the cold shield 40 are not particularly limited. In one embodiment, the cold shield 40 is formed by bending a thin copper plate into a cylindrical shape and welding or riveting.
The cold screen 40 is close to or directly contacts with the cold fluid return pipe 30, so that the cold fluid return pipe 30 can be utilized to cool the cold screen 40. In one embodiment, the outer surface of the cold shield 40 is in contact with the cold fluid return 30. Optionally, the cold shield 40 and the cold fluid return pipe 30 are fixed by brazing to ensure a thermal contact area and sufficient heat exchange.
The magnetic resonance apparatus includes a refrigerator 60, a cold fluid chamber 70, a cold fluid conveying pipe structure, and a cold conductor 80. The cold helium is placed in the cold fluid chamber 70 and the closed cold fluid conveying pipe structure, and the circulating pump 130 can circulate the cold helium in the cold fluid conveying pipe structure, so that the cold helium continuously circulates between the cold fluid chamber 70 and the coil 120. The cold fluid chamber 70 is connected to the refrigerator 60, the refrigerator 60 can generate low temperature and cool the cold helium to low temperature (about 30K), after the low temperature cold helium circulates to the coil 120, the coil 120 is cooled to low temperature (for example, 77K), the cold helium itself is heated (for example, 77K), and the heated cold helium circulates back to the cold fluid chamber 70 and is cooled by the refrigerator 60. With the cryogenic coil cooling device, the cold helium is permanently enclosed in the cold fluid chamber 70 and the cold fluid conveying pipeline structure, and the coil 120 is continuously cooled, so that the loss of the cold helium can be avoided, and the maintenance difficulty is reduced. The cold fluid conveying pipeline structure comprises an outer pipe 10, a cold fluid inlet pipe 20, a cold fluid return pipe 30 and a cold screen 40. The outer tube 10 encloses a vacuum chamber 101. The cold fluid inlet pipe 20 is used for conveying cold fluid to a load for heat exchange. The cold fluid return pipe 30 is disposed in the vacuum chamber 101, and is used for conveying the cold fluid after heat exchange to the cold fluid chamber. The cold shield 40 is disposed in the vacuum chamber 101 adjacent to the cold fluid return 30, and the cold shield 40 surrounds and forms a cavity 102. The cold fluid inlet pipe 20 is disposed in the cavity 102. The cold fluid conveying pipeline structure arranges the cold fluid inlet pipe 20 and the cold fluid return pipe 30 in the same vacuum outer pipe 10, so that the conveying pipeline structure is compact. Cold fluid advances pipe 20 overcoat and establishes cold screen 40, and utilizes cold fluid return pipe 30 is right cold screen 40 cools down for external radiation can not direct action cold fluid advances pipe 20, and greatly reduced cold fluid advances the heat leakage of pipe 20, and then has improved the cooling effect to the load.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A cold fluid transfer piping structure, comprising:
a cold shield forming a cavity;
the cold fluid inlet pipe is arranged in the cavity of the cold shield and used for conveying cold fluid to a load for heat exchange;
and the cold fluid return pipe is used for conveying the cold fluid after heat exchange back.
2. The cold fluid conveying pipeline structure of claim 1, wherein the cold fluid return pipe is arranged in parallel with the cold fluid inlet pipe, the cold screen is sleeved outside the cold fluid inlet pipe, and a gap is formed between the cold screen and the cold fluid inlet pipe.
3. The cold fluid conveying piping structure of claim 1, wherein the cold shield is disposed proximate to the cold fluid return.
4. The cold fluid conveying piping structure of claim 1, wherein the cold shield is in contact with the cold fluid return.
5. The cold fluid conveying piping structure of claim 4, wherein the side of the cold shield in contact with the cold fluid return pipe is connected by a highly thermally conductive material.
6. The cold fluid conveying pipeline structure of claim 4, wherein the side of the cold shield in contact with the cold fluid return pipe is connected with the cold fluid return pipe by welding or bonding.
7. The cold fluid transfer piping structure of claim 1, wherein said cold shield material is copper or aluminum.
8. The cold fluid conveying pipeline structure of claim 1, wherein the cold fluid inlet pipe and the cold fluid return pipe are both made of stainless steel.
9. The cold fluid conveying pipeline structure of claim 1, further comprising an outer pipe forming a vacuum chamber, wherein the cold shield, the cold fluid inlet pipe and the cold fluid return pipe are disposed in the vacuum chamber; the outer tube is made of stainless steel.
10. A low-temperature coil cooling device is characterized by comprising a cold fluid cavity and a cold fluid conveying pipeline structure;
the cold fluid conveying pipeline structure and the cold fluid cavity form a closed structure, and the cold fluid conveying pipeline structure comprises a cold fluid inlet pipe and a cold fluid return pipe;
the closed structure formed by the cold fluid conveying pipeline structure and the cold fluid cavity is used for circulation of cold fluid.
11. A magnetic resonance apparatus comprising a cold fluid conveying conduit structure as claimed in any one of claims 1 to 9 and/or a cryogenic coil cooling arrangement as claimed in claim 10, the apparatus further comprising a coil, the cold fluid conveying conduit structure being for heat exchange with the coil, the cryogenic coil cooling arrangement being for cooling the coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110298483.8A CN112986877A (en) | 2021-03-19 | 2021-03-19 | Cold fluid conveying pipeline structure, low-temperature coil cooling device and magnetic resonance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110298483.8A CN112986877A (en) | 2021-03-19 | 2021-03-19 | Cold fluid conveying pipeline structure, low-temperature coil cooling device and magnetic resonance equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112986877A true CN112986877A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110298483.8A Pending CN112986877A (en) | 2021-03-19 | 2021-03-19 | Cold fluid conveying pipeline structure, low-temperature coil cooling device and magnetic resonance equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112986877A (en) |
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2021
- 2021-03-19 CN CN202110298483.8A patent/CN112986877A/en active Pending
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