CN213635558U - Cold head transfer structure for superconducting magnet - Google Patents
Cold head transfer structure for superconducting magnet Download PDFInfo
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- CN213635558U CN213635558U CN202121197758.0U CN202121197758U CN213635558U CN 213635558 U CN213635558 U CN 213635558U CN 202121197758 U CN202121197758 U CN 202121197758U CN 213635558 U CN213635558 U CN 213635558U
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Abstract
The utility model discloses a cold head transmission structure for superconducting magnet, it belongs to superconducting magnetic resonance imaging system technical field, include: a dewar having a load therein; the refrigerating head of the refrigerator extends into the Dewar, and one end of the refrigerating head, which is close to the load, is provided with a secondary cold head; the cold guide medium container is filled with cold guide media, one end of the cold guide medium container is connected with the secondary cold head, and the other end of the cold guide medium container is connected with the load; the utility model discloses a be full of the cold medium container of leading cold medium, make the cold volume transmission between the refrigeration head of refrigerator and the load adopt "solid-liquid combination" conduction refrigeration mode, not only compare in solid conduction refrigeration mode, improvement conduction efficiency that can be very big reduces the conduction and decreases, compares in traditional liquid helium conduction refrigeration mode moreover, the also great reduction of the use amount of liquid helium.
Description
Technical Field
The utility model relates to a superconductive magnetic resonance imaging system technical field, concretely relates to cold head transmission structure for superconducting magnet.
Background
A superconducting magnetic resonance imaging system is one of the currently important clinical imaging means, and a magnetic resonance superconducting magnet is used as one of the core components thereof for providing a background magnetic field required by magnetic resonance imaging.
At present, the main structure of a magnetic resonance superconducting magnet is generally a superconducting coil using liquid helium as a refrigerant, the superconducting coil and the liquid helium are contained in a dewar, and the usage amount of the liquid helium is generally more than 800 liters. Since liquid helium is a scarce resource, is not renewable, and is expensive, how to maximally reduce the usage of liquid helium is one of the important directions in the development of superconducting magnet technology.
In this context, a liquid-free helium superconducting magnet employing solid conduction refrigeration becomes a hot research, wherein improvement of conduction efficiency is crucial to development of the liquid-free helium superconducting magnet. The cold source of the superconducting magnet is generally a refrigerator, and at present, the contact conduction efficiency from a refrigerating head of the refrigerator to the superconducting coil is still to be improved. Patent CN206546753 proposes a jacket device of a refrigerator for a superconducting magnet, which adopts a solid conduction refrigeration mode, but the scheme still has difficulty in solving the problem of large loss of conduction efficiency in the solid conduction refrigeration mode.
Disclosure of Invention
To the problem that exists among the prior art, the utility model provides a pair of a cold head transmission structure for superconducting magnet through being full of the cold medium container of leading cold medium, makes the cold volume transmission between the refrigeration head of refrigerator and the load adopt "solid-liquid combination" conduction refrigeration mode, not only compares in solid conduction refrigeration mode, improvement conduction efficiency that can be very big reduces the conduction and decreases, compares in traditional liquid helium conduction refrigeration mode moreover, the also great reduction of use amount of liquid helium.
In order to realize the purpose, the utility model discloses a technical scheme as follows:
a cold head transfer structure for a superconducting magnet, comprising:
a dewar having a load therein;
the refrigerating head of the refrigerator extends into the Dewar, and one end of the refrigerating head, which is close to the load, is provided with a secondary cold head;
and the cold guide medium container is filled with cold guide media, one end of the cold guide medium container is connected with the secondary cold head, and the other end of the cold guide medium container is connected with the load.
As a preferred technical solution, the load is a superconducting coil; and/or the cold conducting medium is helium.
As a preferable technical solution, a cold conduction shield is provided between the dewar and the load, and the cold conduction shield covers the load.
As a preferred technical scheme, the refrigeration head penetrates through the cold guide screen, a primary cold head is arranged on the refrigeration head, and the primary cold head is connected with the cold guide screen.
As a preferred technical scheme, a cold guide block is arranged between the primary cold head and the cold guide screen, one end of the cold guide block is connected with the primary cold head, and the other end of the cold guide block is connected with the cold guide screen.
As a preferable technical scheme, a first connecting pipe is arranged between the dewar and the cold guide screen, a second connecting pipe is arranged between the cold guide screen and the cold guide medium container, and the refrigerating head penetrates through the first connecting pipe and the second connecting pipe.
As a preferable technical scheme, a radiating fin is arranged between the secondary cold head and the cold conducting medium container, one end of the radiating fin is connected with the secondary cold head, and the other end of the radiating fin is connected with the cold conducting medium container.
As a preferred technical scheme, a micro-pressure difference transmitter and a heating sheet are arranged in the cold conducting medium container, the micro-pressure difference transmitter is connected with a controller, and the controller is connected with the heating sheet.
The utility model has the advantages of that:
the utility model discloses a be full of the cold medium container of leading cold medium, make the cold volume transmission between the refrigeration head of refrigerator and the load adopt "solid-liquid combination" conduction refrigeration mode, not only compare in solid conduction refrigeration mode, improvement conduction efficiency that can be very big reduces the conduction and decreases, compares in traditional liquid helium conduction refrigeration mode moreover, the also great reduction of the use amount of liquid helium.
Drawings
Fig. 1 is a schematic overall structure diagram of a cold head transmission structure for a superconducting magnet according to the present invention;
FIG. 2 is a front view of FIG. 1;
fig. 3 is a sectional view taken along the line a-a in fig. 2.
In the figure: 1-Dewar, 11-cold conducting screen, 12-first connecting pipe, 13-second connecting pipe, 2-refrigerator, 21-second cold head, 22-first cold head, 23-radiating fin, 3-cold conducting medium container, 31-heating fin and 4-cold conducting block.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to fig. 3, an embodiment of a cold head transmission structure for a superconducting magnet according to the present invention includes:
a dewar 1, a load (not shown in the figure) is arranged in the dewar 1, and the load is a superconducting coil generally;
the refrigerator 2, the refrigerating head of the refrigerator 2 stretches into the Dewar 1, the refrigerating head near one end of the load is provided with a secondary cold head 21, the refrigerator 2 is used as a cold source of the load, and the cold energy generated at the secondary cold head 21 can be transmitted to the load; refrigerator 2 is typically a GM refrigerator;
the cold-conducting medium container 3 is filled with the cold-conducting medium, one end of the cold-conducting medium container 3 is connected with the secondary cold head 21, the other end of the cold-conducting medium container 3 is connected with a load, the cold-conducting medium is usually helium, the helium usually exists in a liquid form in the cold-conducting medium container 3, the helium transfers cold energy to the load near the load, is gasified, flows to the position near the secondary cold head 21, is liquefied after absorbing the cold energy near the secondary cold head 21, and can flow to the position near the load again, so that the cold energy of the secondary cold head 21 can be continuously transferred to the load, and the heat transfer efficiency is high.
It should be noted that the secondary cold head 21 should be located above the load, so as to effectively ensure the normal circulation flow of the cold-conducting medium in the cold-conducting medium container 3; the cold conducting medium container 3 is made of high cold conducting material, such as copper, and the cold conducting efficiency between the cold conducting medium container 3 and the load can be improved by padding indium sheets and/or coating heat conducting silicone grease; in practical use, the amount of the liquid helium in the cold-conducting medium container 3 is generally not more than 10 liters, and the normal operation requirement of the utility model can be met.
In this embodiment, referring to fig. 3, a cold conduction screen 11 is disposed between the dewar 1 and the load, the cold conduction screen 11 covers the load, and the cold conduction screen 11 can prevent heat convection to the load and ensure the heat preservation to the load; further, the refrigeration head penetrates through the cold guide screen 11, a primary cold head 22 is arranged on the refrigeration head, the primary cold head 22 is connected with the cold guide screen 11, and the primary cold head 22 can transmit cold energy to the cold guide screen 11; specifically, be equipped with between one-level cold head 22 and the cold screen 11 and lead cold block 4, lead the one end and the one-level cold head 22 of cold block 4 and be connected, lead the other end and the cold screen 11 of cold block 4 and be connected, realize the transmission of cold volume through the mode of solid conduction between one-level cold head 22 and the cold screen 11 that leads, wherein, lead cold block 4 and should adopt high cold material of leading to make, for example copper.
In this embodiment, referring to fig. 1-3, a first connecting pipe 12 is disposed between the dewar 1 and the cold conducting screen 11, a second connecting pipe 13 is disposed between the cold conducting screen 11 and the cold conducting medium container 3, the refrigeration head passes through the first connecting pipe 12 and the second connecting pipe 13, the first connecting pipe 12 and the second connecting pipe 13 can form a channel for the refrigeration head to enter the dewar 1, and the internal space of the dewar 1 is isolated from the channel, so that a certain heat preservation effect is achieved, and helium loss can be prevented; preferably, first connecting pipe 12 and second connecting pipe 13 all can be established to the bellows, can cushion the stress when refrigeration head is connected with leading cold screen 11 and leading cold medium container 3 respectively effectively, guarantee the utility model discloses a normal operating.
In this embodiment, referring to fig. 3, a heat dissipation fin 23 is disposed between the secondary cold head 21 and the cold conducting medium container 3, one end of the heat dissipation fin 23 is connected to the secondary cold head 21, and the other end of the heat dissipation fin 23 is connected to the cold conducting medium container 3, and the heat dissipation fin 23 can further increase the heat dissipation area at the secondary cold head 21, so as to effectively increase the transfer efficiency of the cold energy between the secondary cold head 21 and the cold conducting medium container 3.
In this embodiment, referring to fig. 3, a micro differential pressure transmitter (not shown in the figure) and a heating plate 31 are arranged in the cooling medium guiding container 3, the micro differential pressure transmitter is connected to a controller, the controller is connected to the heating plate 31, the micro differential pressure transmitter is used for monitoring the air pressure in the cooling medium guiding container 3 and sending the air pressure value information to the controller, when the air pressure is lower than a preset value, the controller starts the heating plate 31 to heat, so that part of the liquid helium in the cooling medium guiding container 3 is gasified, the air pressure in the cooling medium guiding container 3 is higher than the preset value, and the air pressure in the cooling medium guiding container 3 can be kept stable; specifically, the controller is provided outside the dewar 1, and the controller is preferably a PLC.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A cold head transfer structure for a superconducting magnet, comprising:
a dewar having a load therein;
the refrigerating head of the refrigerator extends into the Dewar, and one end of the refrigerating head, which is close to the load, is provided with a secondary cold head;
and the cold guide medium container is filled with cold guide media, one end of the cold guide medium container is connected with the secondary cold head, and the other end of the cold guide medium container is connected with the load.
2. A cold head transfer structure for a superconducting magnet according to claim 1, wherein the load is provided as a superconducting coil; and/or the cold conducting medium is helium.
3. A cold head transfer structure for a superconducting magnet according to claim 1 or 2, wherein a cold conducting shield is provided between the dewar and the load, and the cold conducting shield covers the load.
4. A cold head transfer structure for a superconducting magnet according to claim 3, wherein the cooling head passes through the cold conducting shield, and a primary cold head is provided on the cooling head and connected to the cold conducting shield.
5. A coldhead transfer structure for a superconducting magnet according to claim 4, wherein a coldness conduction block is disposed between the primary coldhead and the coldness conduction shield, one end of the coldness conduction block is connected to the primary coldhead, and the other end of the coldness conduction block is connected to the coldness conduction shield.
6. A cold head transfer structure for a superconducting magnet according to claim 3, wherein a first connection pipe is provided between the dewar and the cold conducting shield, a second connection pipe is provided between the cold conducting shield and the cold conducting medium container, and the cold head passes through the first connection pipe and the second connection pipe.
7. A cold head transfer structure for a superconducting magnet according to claim 1 or 2, wherein a heat sink is provided between the secondary cold head and the cold conducting medium container, one end of the heat sink is connected to the secondary cold head, and the other end of the heat sink is connected to the cold conducting medium container.
8. A cold head transfer structure for a superconducting magnet according to claim 1 or 2, wherein a micro-pressure difference transmitter and a heating plate are arranged in the cold conducting medium container, the micro-pressure difference transmitter is connected with a controller, and the controller is connected with the heating plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121197758.0U CN213635558U (en) | 2021-06-01 | 2021-06-01 | Cold head transfer structure for superconducting magnet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121197758.0U CN213635558U (en) | 2021-06-01 | 2021-06-01 | Cold head transfer structure for superconducting magnet |
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| CN213635558U true CN213635558U (en) | 2021-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116031039A (en) * | 2023-03-22 | 2023-04-28 | 宁波健信超导科技股份有限公司 | Superconducting magnet heat transfer system |
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2021
- 2021-06-01 CN CN202121197758.0U patent/CN213635558U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116031039A (en) * | 2023-03-22 | 2023-04-28 | 宁波健信超导科技股份有限公司 | Superconducting magnet heat transfer system |
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