CN114783717A - Magnetic resonance system and quench protection device of superconducting magnet thereof - Google Patents
Magnetic resonance system and quench protection device of superconducting magnet thereof Download PDFInfo
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- CN114783717A CN114783717A CN202210684636.7A CN202210684636A CN114783717A CN 114783717 A CN114783717 A CN 114783717A CN 202210684636 A CN202210684636 A CN 202210684636A CN 114783717 A CN114783717 A CN 114783717A
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- superconducting magnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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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
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
- G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/02—Quenching; Protection arrangements during quenching
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Abstract
The invention discloses a magnetic resonance system and a quench protection device of a superconducting magnet thereof, belongs to the field of superconducting magnets, and is used for protecting the superconducting magnet under the quench condition. The reason of considering to freeze is inside external moisture gets into the superconducting magnet, consequently this application can judge the rupture disk through the atmospheric pressure value that pressure detecting device detected and be backed down the back, reserve the time of predetermineeing for long time so that the inside gas outgoing of superconducting magnet, then the electric control valve door of rethread is closed, thereby quench the blast pipe, isolated with superconducting magnet and outside air, on the one hand can not hinder the normal exhaust of superconducting magnet, on the other hand prevents that external moisture from getting into inside the superconducting magnet, the emergence of the phenomenon of freezing of superconducting coil has been avoided, thereby superconducting coil has been protected, and maintenance cost is reduced.
Description
Technical Field
The invention relates to the field of superconducting magnets, in particular to a quench protection device of a superconducting magnet, and also relates to a magnetic resonance system.
Background
The superconducting coil of the superconducting magnet is made of superconducting materials and is positioned in liquid helium inside the superconducting magnet (the working temperature of the superconducting coil is in an ultralow temperature environment obtained in the liquid helium with an absolute temperature scale of 4.2K, and reaches absolute zero (-273 ℃)), and the superconducting coil is in a superconducting state and has no resistance.
However, when the superconductivity of the superconducting coil is lost due to some uncontrollable factors, the superconducting coil can generate a large amount of heat under the action of large current, so that liquid helium in the superconducting magnet is volatilized into helium, and because the volume ratio of the helium to the liquid helium is 700 times different, high pressure can be generated in the superconducting magnet instantly, a rupture disc of the quench exhaust pipe is burst to release the pressure, after the pressure release is completed, moisture in the environment can enter the inside of the superconducting magnet, so that the phenomenon that the superconducting coil is frozen is caused, the superconducting coil can be damaged, and the maintenance cost is increased.
Therefore, how to provide a solution to the above technical problems is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a quench protection device of a superconducting magnet, which can not hinder the normal exhaust of the superconducting magnet on one hand, and prevent external moisture from entering the inside of the superconducting magnet on the other hand, thereby avoiding the occurrence of the icing phenomenon of the superconducting coil, protecting the superconducting coil and reducing the maintenance cost; another object of the present invention is to provide a magnetic resonance system including the quench protection device for a superconducting magnet, which does not hinder the normal exhaust of the superconducting magnet, and prevents external moisture from entering the inside of the superconducting magnet, thereby preventing the occurrence of icing of the superconducting coil, protecting the superconducting coil, and reducing the maintenance cost.
In order to solve the above technical problem, the present invention provides a quench protection device for a superconducting magnet, including:
the pressure detection device is connected with the superconducting magnet and is used for detecting the air pressure value inside the superconducting magnet;
the electric control valve is arranged at the downstream of the rupture disk in the quench exhaust pipe of the superconducting magnet;
and the controller is used for controlling the electric control valve to be closed from a normally open state after the preset duration of the rupture disk which is jacked open is judged according to the air pressure value, so that the superconducting magnet is isolated from the outside air.
Preferably, the apparatus for quench protection of a superconducting magnet further comprises:
a prompting device;
the controller is further used for controlling the prompting device to prompt the superconducting magnet to quench when the rupture disk is judged to be jacked open through the air pressure value.
Preferably, the prompting device includes:
the local prompter is used for prompting the superconducting magnet to quench under the control of the controller;
and the network terminal is used for receiving the prompt instruction of the controller and controlling the controller to prompt the superconducting magnet to quench.
Preferably, the local prompter is an audible and visual alarm.
Preferably, the network terminal is a mobile phone.
Preferably, the controller is a single chip microcomputer.
Preferably, the electrically controlled valve is an electronic ball valve.
Preferably, the electrically controlled valve comprises a plurality of electrically controlled sub-valves;
the specific step of controlling the electric control valve to be closed from a normally open state is as follows:
and controlling all the electronic control sub-valves in the electronic control valves to be closed in a normally open state.
Preferably, the number of the electronic control sub-valves is 2.
In order to solve the technical problem, the invention further provides a magnetic resonance system which comprises the superconducting magnet protection device.
The invention provides a quench protection device of a superconducting magnet, and the reason of icing is that external moisture enters the inside of the superconducting magnet, so that after a rupture disk is judged to be jacked open through an air pressure value detected by a pressure detection device, a preset time is reserved to facilitate the discharge of gas inside the superconducting magnet, and then an electric control valve is closed, so that a quench exhaust pipe is closed, the superconducting magnet is isolated from external air, on one hand, the normal exhaust of the superconducting magnet is not hindered, on the other hand, the external moisture is prevented from entering the inside of the superconducting magnet, the occurrence of the icing phenomenon of a superconducting coil is avoided, the superconducting coil is protected, and the maintenance cost is reduced.
The invention also provides a magnetic resonance system which has the same beneficial effects as the quench protection device of the superconducting magnet.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a quench protection device for a superconducting magnet according to the present invention;
fig. 2 is a schematic structural diagram of another quench protection device for a superconducting magnet according to the present invention.
Detailed Description
The core of the invention is to provide a quench protection device of a superconducting magnet, which can not hinder the normal exhaust of the superconducting magnet on one hand, and prevent external moisture from entering the inside of the superconducting magnet on the other hand, thereby avoiding the occurrence of the icing phenomenon of the superconducting coil, protecting the superconducting coil and reducing the maintenance cost; another core of the present invention is to provide a magnetic resonance system including the quench protection apparatus for a superconducting magnet, which does not hinder normal exhaust of the superconducting magnet, and prevents external moisture from entering the inside of the superconducting magnet, thereby preventing the occurrence of icing of the superconducting coil, protecting the superconducting coil, and reducing the maintenance cost.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a quench protection apparatus for a superconducting magnet according to the present invention, the quench protection apparatus for a superconducting magnet includes:
the pressure detection device 1 is connected with the superconducting magnet and is used for detecting the air pressure value in the superconducting magnet;
an electric control valve 2 arranged at the downstream of the rupture disk in the quench exhaust pipe of the superconducting magnet;
and the controller 3 is used for controlling the electric control valve 2 to be closed from a normally open state after the preset duration that the rupture disk is jacked open is judged according to the air pressure value, so that the superconducting magnet is isolated from the outside air.
Specifically, in fig. 1, the columnar object where the electrically controlled valve 2 is located is a quench exhaust pipe.
In particular, superconducting magnets are an important component of magnetic resonance systems. Its function is to provide a stable and powerful main magnetic field, which is the most important basis for imaging in magnetic resonance systems. The superconducting magnet is manufactured by utilizing the phenomenon that the resistance of a superconducting material is reduced to zero at a certain temperature, and is generally made of a niobium-titanium alloy material, and is cooled by liquid helium (4.2K), and when a current passes through a magnet coil to generate a specified magnetic field, a power supply is cut off, so that a stable and uniform magnetic field can be formed. The magnet maintains the coil below the critical temperature by the cryogen, without the need for an additional power supply. The main difference between superconducting and normal magnets is that the wires are made of superconducting material and placed in liquid helium. The working temperature of the superconductor coil is in an ultralow temperature environment obtained in liquid helium with an absolute temperature scale of 4.2K, and reaches absolute zero (-273 ℃), and at the moment, the coil is in a superconducting state and has no resistance. When the resistance of the superconducting coil is equal to zero at the temperature of 8K, the boiling point of the liquid helium is 77K. The superconducting magnet is provided with an excitation power supply, excitation current is emitted from the excitation power supply and circularly flows through a coil of the superconducting magnet, when the current rises to enable a magnetic field to establish a preset field intensity, a switch of the superconducting magnet is closed, the excitation power supply is disconnected, and the current circularly flows in the closed superconducting coil almost without attenuation, so that a stable, uniform and high-field-intensity magnetic field is generated.
When the superconductivity of the inside of the superconducting coil is lost due to some uncontrollable factors, the coil can generate a large amount of heat under the action of large current, so that liquid helium in the magnet is volatilized into helium. Because the volume ratio of helium to liquid helium is 700 times, high pressure is generated in the superconducting magnet instantly, and a rupture disk of the quench pipeline is burst to release pressure, so that the inside of the superconducting magnet and the external environment form a passage. At the moment, because of the large temperature difference between the inside and the outside, the pressure inside the magnet is too small, so that air enters to cause the coil to be frozen, and the coil is frozen.
It is specific, consider as technical problem among the above background art, combine to consider again that the reason of icing gets into inside the superconducting magnet for external moisture, consider simultaneously if just closing quench exhaust pipe when the quench condition just takes place, then the inside a large amount of gas of superconducting magnet may lead to the explosion, consequently this application judges the rupture disc by the back of back-pushing open at the atmospheric pressure value that detects through pressure detection device 1, can not control automatically controlled valve 2 immediately and close, but reserve the time of predetermineeing for a long time so that the inside gas outgoing of superconducting magnet, then rethread electrically controlled valve 2 closes, thereby closed quench exhaust pipe and isolated superconducting magnet and outside air, make the moisture can not get into inside the superconducting magnet when not hindering the normal exhaust of superconducting magnet.
The preset time period may be set autonomously according to experience, so that at the moment when the electrically controlled valve 2 is closed, the air pressure value inside the superconducting magnet is slightly higher than or equal to the standard atmospheric pressure, for example, may be set to 8 seconds, and the like.
Specifically, the pressure detection device 1 may be a plurality of types of air pressure sensors, and the embodiment of the present invention is not limited herein.
Specifically, the step of judging whether the rupture disk is jacked open through the air pressure value may specifically be: when the air pressure value is greater than the preset determination threshold value, it is determined that the rupture disk is pushed open, and the like.
The preset determination threshold may be set autonomously, and the embodiment of the present invention is not limited herein.
In addition, it is worth mentioning that whether the air pressure value is larger than the preset alarm value can be judged again after the electric control valve 2 is controlled to be closed, if so, the electric control valve 2 can be opened again for a second preset time and then closed, and then the step of 'judging whether the air pressure value is larger than the preset alarm value again after the electric control valve 2 is controlled to be closed' is repeated until the air pressure value is not larger than the preset alarm value, so that the safety of the superconducting magnet can be further ensured.
The invention provides a quench protection device of a superconducting magnet, and the reason of icing is that external moisture enters the inside of the superconducting magnet, so that after a rupture disk is judged to be jacked open through an air pressure value detected by a pressure detection device, a preset time is reserved to facilitate the discharge of gas inside the superconducting magnet, and then an electric control valve is closed, so that a quench exhaust pipe is closed, the superconducting magnet is isolated from external air, on one hand, the normal exhaust of the superconducting magnet is not hindered, on the other hand, the external moisture is prevented from entering the inside of the superconducting magnet, the occurrence of the icing phenomenon of a superconducting coil is avoided, the superconducting coil is protected, and the maintenance cost is reduced.
On the basis of the above-described embodiment:
as a preferred embodiment, the quench protection device for a superconducting magnet further comprises:
a prompting device 4;
the controller 3 is also used for controlling the prompting device 4 to prompt the superconducting magnet to quench when the rupture disk is judged to be jacked open through the air pressure value.
Specifically, in order to facilitate the workers to know and overhaul at the first time after the quench condition occurs, the controller 3 in the embodiment of the present invention may further control the prompting device 4 to prompt the quench of the superconducting magnet when it is determined through the air pressure value that the rupture disk is pushed open, so that the overhaul speed of the workers can be increased, thereby increasing the work efficiency.
Specifically, when the staff feels field maintenance, the superconducting magnet can be refilled with liquid helium, excited, shimmed and replaced with a new rupture disk, and then the electronic ball valve is manually reset.
As a preferred embodiment, the prompting device 4 includes:
the local prompter is used for prompting the superconducting magnet to quench under the control of the controller 3;
and the network terminal is used for receiving the prompt instruction of the controller 3 and controlling the superconducting magnet to prompt the superconducting magnet to quench.
Specifically, the local prompter is favorable for enabling staff near the superconducting magnet to timely discover conditions and conduct maintenance, the network terminal can be favorable for staff at the side of the network terminal to timely discover conditions and conduct maintenance under the condition that no staff exists near the superconducting magnet, and the local prompter and the network terminal are combined to be more favorable for the staff to quickly conduct maintenance, so that the working efficiency is further improved.
In a preferred embodiment, the local alarm is an audible and visual alarm.
Specifically, the audible and visual alarm has the advantages of good prompting effect, low cost, long service life and the like.
Of course, the local alarm may be of various types other than the audible and visual alarm, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the network terminal is a mobile phone.
Specifically, the mobile phone has the advantages of high popularity, high information transmission efficiency and the like.
Of course, the network terminal may be of various types other than the mobile phone, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the controller 3 is a single chip microcomputer.
Specifically, the single chip microcomputer has the advantages of being small in size, low in cost, long in service life and the like.
Of course, the controller 3 may be of various types other than a single chip, and the embodiment of the present invention is not limited herein.
In a preferred embodiment, the electrically controlled valve 2 is an electronic ball valve.
Specifically, the electronic ball valve has the advantages of small volume, low cost, long service life and the like.
Of course, the electrically controlled valve 2 may be of various types other than the electronic ball valve, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the electrically controlled valve 2 comprises a plurality of electrically controlled sub-valves;
the specific step of controlling the electronic control valve 2 to be closed from the normally open state is as follows:
all the electric control sub-valves in the control electric control valve 2 are closed in a normally open state.
Specifically, in order to prevent a single electronic control sub-valve from being unable to be closed in time due to a fault, a plurality of electronic control sub-valves may be provided in the embodiment of the present invention, so that, in time, one of the electronic control sub-valves is unable to be closed in time due to a fault, and the other electronic control sub-valves may be closed to cut off external moisture, thereby further protecting the superconducting magnet.
As a preferred embodiment, the number of electrically controlled sub-valves is 2.
Specifically, the cost is saved by the two electric control sub-valves, and the situation that external moisture cannot be cut off due to the fault of the single electric control sub-valve can be avoided.
Wherein, each electronic control sub-valve is arranged in series in the quench exhaust pipe.
Of course, the number of the electronic control sub-valves may be other than 2, and the embodiment of the present invention is not limited herein.
In order to solve the technical problem, the invention also provides a magnetic resonance system which comprises the superconducting magnet protection device.
For the introduction of the magnetic resonance system provided in the embodiment of the present invention, reference is made to the embodiment of the quench protection device for the superconducting magnet, and details of the embodiment of the present invention are not repeated herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should also be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A quench protection device for a superconducting magnet, comprising:
the pressure detection device is connected with the superconducting magnet and is used for detecting the air pressure value inside the superconducting magnet;
the electronic control valve is arranged at the downstream of the rupture disk in the quench exhaust pipe of the superconducting magnet;
and the controller is used for controlling the electric control valve to be closed from a normally open state after the preset duration of the rupture disk which is jacked open is judged according to the air pressure value, so that the superconducting magnet is isolated from the outside air.
2. The quench protection apparatus for a superconducting magnet according to claim 1, further comprising:
a prompting device;
the controller is further used for controlling the prompting device to prompt the superconducting magnet to quench when the rupture disk is judged to be jacked open through the air pressure value.
3. The quench protection apparatus for a superconducting magnet according to claim 2, wherein the prompting apparatus includes:
the local prompter is used for prompting the superconducting magnet to quench under the control of the controller;
and the network terminal is used for receiving the prompt instruction of the controller and controlling the controller to prompt the superconducting magnet to quench.
4. The quench protection arrangement for a superconducting magnet according to claim 3, wherein the local alarm is an audible and visual alarm.
5. The quench protection apparatus for superconducting magnet according to claim 3, wherein the network terminal is a mobile phone.
6. The quench protection device for a superconducting magnet according to claim 1, wherein the controller is a single chip microcomputer.
7. The quench protection arrangement for a superconducting magnet according to claim 1, wherein the electrically controlled valve is an electronic ball valve.
8. The quench protection arrangement for a superconducting magnet according to any of claims 1 to 7, wherein the electrically controlled valve comprises a plurality of electrically controlled sub-valves;
the specific step of controlling the electric control valve to be closed from a normally open state is as follows:
and controlling all the electronic control sub-valves in the electronic control valves to be closed in a normally open state.
9. The quench protection arrangement for a superconducting magnet according to claim 8, wherein the number of the electrically controlled sub-valves is 2.
10. A magnetic resonance system comprising a superconducting magnet protection arrangement as claimed in any of claims 1 to 9.
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| CN202210684636.7A CN114783717A (en) | 2022-06-17 | 2022-06-17 | Magnetic resonance system and quench protection device of superconducting magnet thereof |
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