CN215180699U - Technological equipment for testing superconducting switch - Google Patents
Technological equipment for testing superconducting switch Download PDFInfo
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- CN215180699U CN215180699U CN202120892103.9U CN202120892103U CN215180699U CN 215180699 U CN215180699 U CN 215180699U CN 202120892103 U CN202120892103 U CN 202120892103U CN 215180699 U CN215180699 U CN 215180699U
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Abstract
The utility model discloses a technical equipment for testing a superconducting switch, which comprises a low-temperature sealed container, a plurality of current leads and a superconducting switch bracket; the superconducting switch bracket is positioned in the low-temperature sealed container; one or more superconducting switches are fixed on the superconducting switch bracket through a hoop; the current lead is provided with an upper joint and a lower joint, the upper joint is positioned above the top cover of the low-temperature sealed container and is connected with an external power supply, and the lower joint is positioned inside the low-temperature sealed container and is connected with the superconducting switch to be detected; a heater of the superconducting switch is led out of the low-temperature sealed container through an insulated copper covered wire; the superconducting wires of the superconducting switch are closely arranged and fastened on the superconducting switch bracket through an insulating tape. The utility model discloses a technological equipment is used in superconducting switch test can realize need not to switch, directly carries on a plurality of superconducting switch tests, reduces the liquid helium loss, reduces to switch man-hour loss and low temperature loss, reduces the probability of magnetic resonance superconducting magnet hardware great damage.
Description
Technical Field
The utility model relates to a technological equipment is used in superconducting switch test, is particularly useful for the superconducting switch test of magnetic resonance imaging superconducting magnet.
Background
With the rapid development of related technologies such as superconducting technology, cryogenic technology, magnet technology, electronics and computer technology, the superconducting magnetic resonance imaging system technology and magnet technology have been rapidly developed, have been widely applied to clinical applications, and have become an indispensable member in the field of medical imaging. The magnetic resonance imaging device is generally composed of five parts, namely a magnet system, a radio frequency system, a gradient system, a computer system and other auxiliary equipment. The magnet system is primarily a static magnetic field that provides high uniformity and high stability. At present, the low-field magnetic resonance system is mainly a permanent magnet, a part of the low-field open type magnetic resonance system also starts to use a superconducting magnet, and the high-field magnetic resonance system is mainly the superconducting magnet.
At present, a superconducting magnet for a magnetic resonance system mainly adopts a liquid helium soaking cooling mode, and after a superconducting coil obtains superconducting characteristics under a low-temperature condition, the superconducting coil needs to be charged through an external power supply through a current lead and a magnet internal cable, so that a required magnetic field is achieved. If the field needs to be removed, it is also reasonable to discharge the superconducting coil from an external power supply via current leads and internal cables to the magnet.
In the prior art, superconducting magnet systems are mostly used in magnetic resonance systems. Due to the long-term operation requirements, such superconducting magnet systems are often designed to operate in a closed-loop mode, i.e., with superconducting current in a loop inside the liquid helium tank, and with a very small decay rate.
In order to realize closed-loop operation, a branch (switch heater) of the superconducting switch needs to be connected in parallel between the positive electrode and the negative electrode of the superconducting magnet coil and the excitation power supply.
Before excitation, applying voltage to two ends of a heater tightly attached to or contained in the superconducting switch, and heating a superconducting wire of the superconducting switch nearby, so that the superconducting switch enters an open working mode (resistance state) from a closed working mode (superconducting state); then, the output current is gradually ramped up by the excitation power supply.
Because the branch circuit of the superconducting switch is in a resistance state, most of current can enter the branch circuit where the superconducting magnet coil is located, and therefore the purpose of exciting the superconducting magnet coil is achieved; and stopping the climbing of the output current of the excitation power supply after the current in the magnet coil reaches a preset value, and removing the voltage applied to the two ends of the superconducting switch heater. After the external heating disappears, the superconducting switch enters a closed working mode (superconducting state) from an open working mode (resistance state) along with the reduction of the temperature.
At this time, the output current is gradually reduced by the excitation power supply. Because the branch circuit of the superconducting switch is in a superconducting state and the superconducting switch usually only has the characteristic of small inductance, the current on the superconducting switch can be gradually increased along with the reduction of the output current of the excitation power supply, and the current flowing on the superconducting magnet coil with larger inductance basically does not change; when the output current of the excitation power supply is reduced to zero, the superconducting switch and the superconducting magnet coil have the same current, and a current closed loop is formed. At this time, the connection between the excitation power supply and the positive and negative electrodes of the superconducting magnet can be disconnected.
It can be seen that after the closed loop operation is entered, the superconducting magnet can maintain a long-term continuous operation with approximately zero energy consumption. An important component for achieving the operation in the closed-loop mode is the switching of the superconducting switch between the closed (superconducting state) and the open (resistive state) operating modes. In conventional and known technology, this state switching is mostly achieved by switching the heater. There are also special techniques for switching between the on and off states of a superconducting switch by applying an external magnetic field or external stress.
The good performance of the superconducting switch plays a more critical role in the excitation and use processes, and the technical equipment for the superconducting switch test plays a role in quality control and quality guarantee on the good performance of the superconducting switch.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art's defect, provide a technological equipment for superconducting switch test, can realize need not to switch, directly carry on a plurality of superconducting switch tests to guarantee that magnetic resonance superconducting magnet can reduce the liquid helium loss in excitation and use, reduce and switch man-hour loss and low temperature loss, reduce the probability of the great damage of magnetic resonance superconducting magnet hardware, thereby further reduce cost of labor and quality cost.
The technical scheme for realizing the purpose is as follows: a process equipment for testing a superconducting switch comprises a low-temperature sealed container, a plurality of current leads and a superconducting switch bracket, wherein:
a support plate is transversely arranged in the low-temperature sealed container;
the superconducting switch bracket is positioned in the low-temperature sealed container and fixed on the upper side and the lower side of the supporting plate;
one or more superconducting switches are fixed on the superconducting switch bracket through a hoop;
each current lead is provided with an upper joint and a lower joint, the upper joint is positioned above the top cover of the low-temperature sealed container and is connected with an external power supply, and the lower joint is positioned inside the low-temperature sealed container and is connected with a superconducting switch to be detected;
one of the current leads is a positive current lead, and the rest of the current leads are negative current leads;
the heater of the superconducting switch is led out of the low-temperature sealed container through a copper wire with an insulating sheath;
each superconducting switch is provided with two superconducting wires, and the superconducting wires of all the superconducting switches are densely arranged and fastened on a superconducting switch bracket through an insulating adhesive tape; the lower joint of the positive current lead is connected with one superconducting wire of all superconducting switches; the lower taps of all the negative current leads are connected to the other superconducting wire of all the superconducting switches, one for one.
The technical equipment for testing the superconducting switch is characterized in that the low-temperature sealed container is a Dewar tank sealed container, and the Dewar tank sealed container comprises a Dewar tank and a Dewar cover sealed at the upper end of the Dewar tank and provided with an opening.
According to the technical equipment for testing the superconducting switch, the superconducting wire of the superconducting switch is fastened on the lower joint of the corresponding current lead through the tinned copper wire.
The technical equipment for testing the superconducting switch comprises a frame and a switch mounting plate fixed in the frame, wherein the superconducting switch support is positioned on a central axis of the low-temperature sealed container.
The technical equipment for testing the superconducting switch is characterized in that the top end of the superconducting switch bracket is connected with the supporting plate through the vertical rod.
The technical equipment for testing the superconducting switch is characterized in that the current lead is laid in the current lead sleeve.
The technical equipment for testing the superconducting switch is characterized in that the current lead sleeve is a GFRP insulating sleeve.
According to the technical equipment for testing the superconducting switch, the insulating tape is a polyimide tape or a glass fiber cloth tape.
According to the technical equipment for the superconducting switch test, the insulating material of the copper wire with the insulating sheath is made of the insulating material resistant to the low-temperature environment.
The utility model discloses a technological equipment is used in superconducting switch test, under low temperature magnetic field environment, switch on inside superconducting coil of superconducting switch and current lead and film heater wire respectively and test superconducting switch performance, the realization need not to switch, directly carry on a plurality of superconducting switch tests, thereby guarantee that magnetic resonance superconducting magnet can reduce the liquid helium loss in excitation and use, reduce and switch man-hour loss and low temperature loss, reduce the probability of magnetic resonance superconducting magnet hardware great damage, thereby further reduce cost of labor and quality cost.
Drawings
Fig. 1 is a schematic structural view of the technical equipment for testing the superconducting switch of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following detailed description is provided with reference to the accompanying drawings:
referring to fig. 1, a preferred embodiment of the present invention is a process equipment for testing a superconducting switch, which includes a low temperature sealed container, a plurality of current leads 2, and a superconducting switch support 3.
A support plate 4 is transversely arranged in the low-temperature sealed container 1; the cryogenic sealed vessel 1 is a dewar-type sealed vessel including a dewar 11 and a dewar cap 12 sealed at an upper end thereof with an opening. The support plate 4 is disposed laterally within the dewar 11.
The superconducting switch bracket 3 is positioned in the Dewar flask 11 and is fixed below the supporting plate 4; the superconducting switch bracket 3 comprises an outer frame and a switch mounting plate fixed in the outer frame, and the superconducting switch bracket 3 is positioned on the central axis of the low-temperature sealed container 1. The top end of the superconducting switch bracket 3 is connected with a supporting plate 4 through a vertical rod 5.
One or more superconducting switches 100 can be fixed on the switch mounting plate of the superconducting switch bracket 3 through a hoop; the superconducting switch 100 is located in the center of the magnetic field in the cryogenic sealed container 1.
The current lead 2 is laid in a current lead sleeve. Each current lead 2 is provided with an upper joint and a lower joint, the upper joint is positioned above the Dewar cover 12 (namely the top cover of the low-temperature sealed container) and is connected with an external power supply, the lower joint is positioned inside the low-temperature sealed container 1 and is connected with the superconducting switch 100 to be detected, one of the current leads is a positive current lead, and the rest current leads are negative current leads.
The heater of the superconducting switch 100 is led out to the outside of the low-temperature sealed container 1 through the insulated copper wire with the insulation; each superconducting switch 100 is provided with two superconducting wires, and the superconducting wires of all the superconducting switches 100 are closely arranged and fastened on a superconducting switch bracket 3 through an insulating tape; the lower joint of the positive current lead is connected with one superconducting wire of the superconducting switch 100; the lower taps of all the negative current leads are connected to the other superconducting wire of the left and right superconducting switches 100, one for one. A heater of the superconducting switch is led out of the low-temperature sealed container through an insulated copper covered wire;
the superconducting wire of the superconducting switch 100 is fastened to the lower joint of the corresponding current lead 2 through a tinned copper wire, and is reinforced by soldering, so that good contact is ensured.
The current lead sleeve adopts a GFRP insulating sleeve. The insulating tape is polyimide tape or glass fiber cloth tape. The insulating material of the copper wire with the insulating sheath is made of low-temperature-environment-resistant insulating material.
The utility model discloses a technological equipment is used in superconducting switch test, possess one just many negative attributes, many current lead have, wherein the positive pole of the external power supply of top connection of positive pole current lead, all superconducting switch's a superconducting wire is connected to positive pole current lead's lower clutch, all negative pole current lead's lower clutch is connected to the remaining another superconducting wire of each superconducting switch respectively, and fasten superconducting switch on superconducting switch support 3 with the clamp, hang with the driving in the low temperature closed container 1 that possesses the magnetic field, the test of circular telegram respectively, the actual measurement value reaches standard design value can.
To sum up, the utility model discloses a technological equipment is used in superconducting switch test under low temperature magnetic field environment, switches on inside superconducting coil of superconducting switch and current lead and film heater wire respectively and tests superconducting switch performance, realizes need not to switch, directly carries on a plurality of superconducting switch tests to guarantee that the magnetic resonance superconducting magnet can reduce the liquid helium loss in excitation and use, reduce and switch man-hour loss and low temperature loss, reduce the probability of the great damage of magnetic resonance superconducting magnet hardware, thereby further reduce cost of labor and mass cost.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as limitations of the present invention, and that changes and modifications to the above described embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (9)
1. The technical equipment for the superconducting switch test is characterized by comprising a low-temperature sealed container, a plurality of current leads and a superconducting switch bracket, wherein:
a support plate is transversely arranged in the low-temperature sealed container;
the superconducting switch bracket is positioned in the low-temperature sealed container and fixed on the upper side and the lower side of the supporting plate;
one or more superconducting switches are fixed on the superconducting switch bracket through a hoop;
each current lead is provided with an upper joint and a lower joint, the upper joint is positioned above the top cover of the low-temperature sealed container and is connected with an external power supply, and the lower joint is positioned inside the low-temperature sealed container and is connected with a superconducting switch to be detected;
one of the current leads is a positive current lead, and the rest of the current leads are negative current leads;
the heater of the superconducting switch is led out of the low-temperature sealed container through a copper wire with an insulating sheath;
each superconducting switch is provided with two superconducting wires, and the superconducting wires of all the superconducting switches are densely arranged and fastened on a superconducting switch bracket through an insulating adhesive tape; the lower joint of the positive current lead is connected with one superconducting wire of all superconducting switches; the lower taps of all the negative current leads are connected to the other superconducting wire of all the superconducting switches, one for one.
2. The process equipment for testing the superconducting switch according to claim 1, wherein the low-temperature sealed container is a dewar-type sealed container comprising a dewar and a dewar cover sealed at an upper end thereof.
3. The process kit for testing a superconducting switch according to claim 1, wherein the superconducting wire of the superconducting switch is fastened to the lower joint of the corresponding current lead by a tinned copper wire.
4. The technological equipment for testing the superconducting switch according to claim 1, wherein the superconducting switch bracket comprises an outer frame and a switch mounting plate fixed in the outer frame, and the superconducting switch bracket is located on a central axis of the low-temperature sealed container.
5. The tooling of claim 4, wherein the top end of the superconducting switch bracket is connected to the support plate through a vertical rod.
6. The tooling of claim 1, wherein the current lead is routed within a current lead sleeve.
7. The tooling of claim 6, wherein the current lead sleeve is a GFRP insulation sleeve.
8. The process equipment for testing the superconducting switch according to claim 1, wherein the insulating tape is a polyimide tape or a glass cloth tape.
9. The process equipment for testing the superconducting switch according to claim 1, wherein the insulating material of the insulated copper covered wire is an insulating material resistant to a low temperature environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892103.9U CN215180699U (en) | 2021-04-27 | 2021-04-27 | Technological equipment for testing superconducting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892103.9U CN215180699U (en) | 2021-04-27 | 2021-04-27 | Technological equipment for testing superconducting switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215180699U true CN215180699U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120892103.9U Active CN215180699U (en) | 2021-04-27 | 2021-04-27 | Technological equipment for testing superconducting switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215180699U (en) |
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2021
- 2021-04-27 CN CN202120892103.9U patent/CN215180699U/en active Active
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