CN210690797U - Nuclear magnetic resonance apparatus - Google Patents
Nuclear magnetic resonance apparatus Download PDFInfo
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- CN210690797U CN210690797U CN202020667162.1U CN202020667162U CN210690797U CN 210690797 U CN210690797 U CN 210690797U CN 202020667162 U CN202020667162 U CN 202020667162U CN 210690797 U CN210690797 U CN 210690797U
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Abstract
The utility model discloses a nuclear magnetic resonance device, which comprises a magnet, a liquid nitrogen tank, a helium pipe, a vacuum interlayer pipe and a helium cooling component; the liquid nitrogen tank stores liquid nitrogen to primarily cool helium, and the helium cooling assembly is used for cooling helium in the magnet; the helium pipe is inlet section, heat exchange section, linkage segment and export section along its extending direction in proper order, and inlet section, linkage segment and export section are located outside the liquid nitrogen tank, and the heat exchange section is located the liquid nitrogen tank, and the linkage segment is located the vacuum interlayer pipe, and the export section stretches into inside the magnet. The two-stage cooling of the helium gas condensed by the liquid nitrogen and the helium gas condensed by the helium gas cooling assembly can cool the helium gas into liquid helium, the helium gas consumption can be adaptively set according to actual requirements, the controllability of the liquid helium consumption can be improved, the waste of the liquid helium is reduced, and the cost is reduced.
Description
Technical Field
The utility model relates to a superconducting magnet equipment technical field, in particular to nuclear magnetic resonance equipment.
Background
In the existing 3.0T high-end extremity nuclear magnetic resonance imaging system, the cooling medium for cooling the superconducting coil is liquid helium.
However, at present, when liquid helium is supplied, it is difficult to supply the liquid helium according to the practical requirement of the 3.0T high-end extremity nuclear magnetic resonance imaging system, which easily causes the waste of the liquid helium.
Therefore, how to reduce the waste of liquid helium is a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a nuclear magnetic resonance apparatus, which can reduce the waste of liquid helium.
In order to achieve the above object, the utility model provides a following technical scheme:
a nuclear magnetic resonance device comprises a magnet, a liquid nitrogen tank, a helium pipe, a vacuum interlayer pipe and a helium cooling assembly; the liquid nitrogen tank stores liquid nitrogen to primarily cool helium, and the helium cooling assembly is used for cooling helium in the magnet; the helium pipe is inlet section, heat exchange section, linkage segment and export section along its extending direction in proper order, the inlet section the linkage segment with the export section is located outside the liquid nitrogen tank, the heat exchange section is located within the liquid nitrogen tank, the linkage segment is located in the vacuum intermediate layer pipe, the export section stretch into in inside the magnet.
Preferably, an ultra-low temperature probe is arranged at the bottom in the magnet to detect the temperature of the liquid helium, and the ultra-low temperature probe is electrically connected with a temperature display outside the magnet.
Preferably, the helium cooling assembly comprises a first cold head, the nuclear magnetic resonance equipment further comprises a second cold head, the first cold head and the second cold head are connected with the magnet in an exchangeable mode, and the power of the first cold head is larger than that of the second cold head.
Preferably, a liquid level meter is arranged inside the magnet and electrically connected to a liquid level display outside the magnet.
Preferably, the heat exchange section is of a spiral structure.
Preferably, the outer layer of the liquid nitrogen tank is a vacuum interlayer.
Preferably, an exhaust pipeline is arranged on the magnet, a one-way valve is arranged on the exhaust pipeline, and the exhaust direction of the one-way valve is from the inside to the outside of the magnet.
The utility model provides a nuclear magnetic resonance device, which comprises a magnet, a liquid nitrogen tank, a helium pipe, a vacuum interlayer pipe and a helium cooling component; the liquid nitrogen tank stores liquid nitrogen to primarily cool helium, and the helium cooling assembly is used for cooling helium in the magnet; the helium pipe is inlet section, heat exchange section, linkage segment and export section along its extending direction in proper order, and inlet section, linkage segment and export section are located outside the liquid nitrogen tank, and the heat exchange section is located the liquid nitrogen tank, and the linkage segment is located the vacuum interlayer pipe, and the export section stretches into inside the magnet.
The two-stage cooling of the helium gas condensed by the liquid nitrogen and the helium gas condensed by the helium gas cooling assembly can cool the helium gas into liquid helium, the helium gas consumption can be adaptively set according to actual requirements, the controllability of the liquid helium consumption can be improved, the waste of the liquid helium is reduced, and the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a cross-sectional view of a nuclear magnetic resonance apparatus provided by the present invention.
Reference numerals:
1-helium pipe, 101-inlet section, 102-heat exchange section, 103-connecting section, 104-outlet section, 2-liquid nitrogen tank, 201-liquid nitrogen, 202-vacuum interlayer, 3-temperature display, 4-vacuum interlayer pipe, 5-magnet, 6-exhaust pipeline, 601-one-way valve, 7-first cold head, 8-liquid level meter, 9-ultralow temperature probe, 10-4K Dewar cylinder, 11-50K Dewar cylinder, 12-300K Dewar cylinder, 13-liquid level display, 14-shielding coil, 15-superconducting coil and 16-helium cooling component.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The core of the utility model is to provide a nuclear magnetic resonance equipment can reduce the waste of liquid helium.
It will be understood that when an element is referred to as being "secured" to 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In a specific embodiment of the nuclear magnetic resonance apparatus provided by the present invention, see fig. 1 in detail, the apparatus comprises a magnet 5, a liquid nitrogen tank 2, a helium pipe 1, a vacuum interlayer pipe 4 and a helium cooling module 16. The magnet 5 comprises a 4K Dewar cylinder 10, a 50K Dewar cylinder 11 and a 300K Dewar cylinder 12 which are sleeved from inside to outside in sequence, and the 4K Dewar cylinder 10 is internally provided with a superconducting coil 15, a shielding coil 14 and other structures. The liquid nitrogen tank 2 stores liquid nitrogen 201 to preliminarily cool the helium gas, and the helium gas cooling assembly 16 is used for cooling the helium gas in the magnet 5.
The helium pipe 1 is provided with an inlet section 101, a heat exchange section 102, a connecting section 103 and an outlet section 104 in sequence along the extension direction. The inlet section 101, the connecting section 103 and the outlet section 104 are located outside the liquid nitrogen tank 2, the heat exchange section 102 is located inside the liquid nitrogen tank 2, and the heat exchange section 102 is immersed in liquid nitrogen 201 in the liquid nitrogen tank 2. The connecting section 103 is located in the vacuum interlayer pipe 4, specifically, the vacuum interlayer pipe 4 is located between the liquid nitrogen tank 2 and the magnet 5, wherein a liquid nitrogen infusion tube insertion hole is arranged at the top of the magnet 5 in a penetrating manner, and the vacuum interlayer pipe 4 is connected with the magnet 5 through the liquid nitrogen infusion tube insertion hole. The outlet section 104 protrudes inside the magnet 5.
High-purity helium with a certain pressure at the temperature of 300K is led in from the inlet section 101 and is discharged into the interior of the magnet 5 through the heat exchange section 102, the connecting section 103 and the outlet section 104 in sequence. Wherein, in the heat exchange section 102, the helium temperature is reduced from 300K to 80K; the vacuum interlayer pipe 4 has a vacuum interlayer structure, can play a role in heat preservation, and reduces the temperature rise of 80K helium after the helium goes out of the liquid nitrogen tank 2. Thereafter, the helium cooling unit 16 further cools the 80K helium gas in the magnet 5 to become liquid helium.
In this embodiment, two-stage cooling of condensing helium gas by using the liquid nitrogen 201 and condensing helium gas by using the helium gas cooling assembly 16 can cool helium gas into liquid helium, and the helium gas consumption can be adaptively set according to actual needs, so that controllability of the liquid helium consumption can be improved, waste of liquid helium can be reduced, and cost can be reduced.
Further, an ultra-low temperature probe 9 is provided at the bottom inside the magnet 5 to detect the liquid helium temperature, and the ultra-low temperature probe 9 is electrically connected to the temperature display 3 outside the magnet 5. By observing the temperature value of the temperature display 3, it can be determined whether the helium gas in the magnet 5 reaches the liquefaction temperature (4.2K) or not, so as to determine when the helium gas starts to accumulate liquid helium, and to control the shutdown time of the helium gas cooling assembly 16.
Further, the helium cooling assembly 16 comprises a first cold head 7, and the nuclear magnetic resonance equipment further comprises a second cold head. The first cold head 7 and the second cold head are alternatively connected to the magnet 5, and the power of the first cold head 7 is larger than that of the second cold head. Optionally, the first cold head 7 is a high-power cold head with the refrigerating capacity of 1.8W. After the 80K helium gas is discharged into the magnet 5, the first cold head 7 is refrigerated to improve the helium gas liquefaction efficiency, and in the normal work of the magnet 5, the first cold head 7 is replaced by a second cold head to save energy. Of course, in other embodiments, it is also possible to connect the first cold head 7 and the second cold head to the magnet 5 simultaneously and then to activate the first cold head 7 or the second cold head selectively. Wherein the first cold head 7 is connected with the compressor assembly through a cold head drive cable and a compressor air pipe.
Further, a liquid level meter 8 is arranged inside the magnet 5, the liquid level meter 8 is electrically connected with a liquid level display 13 outside the magnet 5, and the amount of liquid helium in the magnet 5 is known.
Further, the heat exchange section 102 is of a spiral structure, so that the contact area between the liquid nitrogen 201 and the heat exchange section 102 is increased, and the cooling efficiency is improved.
Further, the outer layer of the liquid nitrogen tank 2 is a vacuum interlayer 202 to play a heat insulation role, and volatilization of the liquid nitrogen 201 can be effectively reduced.
Further, an exhaust pipeline 6 is arranged on the magnet 5, a one-way valve 601 is arranged on the exhaust pipeline 6, the exhaust direction of the one-way valve 601 is from the inside to the outside of the magnet 5, the exhaust pipeline 6 leads to the outside of the magnet 5 from the magnet 5, and the exhaust direction can be ensured by the one-way valve 601.
The utility model provides a liquid helium preparation principle of nuclear magnetic resonance equipment as follows:
(1) high purity helium gas at a temperature of 300K and a certain pressure is made to pass through an inlet section 101 of a helium pipe 1 into a heat exchange section 102 in a liquid nitrogen tank 2, and the temperature of the helium gas is reduced from 300K to 80K.
(2) Helium enters the vacuum interlayer tube 4 through the heat exchange section 102 and then enters the magnet 5, and the temperature rise of the helium is small due to the protection of the vacuum interlayer tube 4.
(3) Firstly, helium in the magnet 5 is cooled by a first cold head 7 with refrigerating capacity of 1.8W and high power, data detected by an ultralow temperature probe 9 displayed by the temperature display 3 are observed, and liquid helium begins to accumulate when the temperature display 3 displays that the temperature is 4.2K.
(4) And after the liquid helium is accumulated, observing the detection data of the liquid level meter 8 displayed by the liquid level display 13 until the required liquid helium amount is more than that.
(5) And (3) replacing the cold head, and replacing the high-power first cold head 7 by adopting a second cold head required by the normal work of the magnet 5.
The utility model provides a nuclear magnetic resonance equipment through evacuation, liquid nitrogen precooling, evacuation, utilizes the liquid nitrogen conveyor that liquid nitrogen tank 2, helium pipe 1, vacuum intermediate layer pipe constitute to and utilize helium cooling module to obtain liquid helium to the high-purity helium gas of certain pressure (99.999%) condensation mode. According to the scheme, high-purity helium gas is adopted to replace liquid helium, so that the problems of waste of the liquid helium and difficulty in purchasing the liquid helium are solved, and the production cost is reduced. The nuclear magnetic resonance device may be a 3.0T high-end extremity nuclear magnetic resonance imaging system.
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.
The nuclear magnetic resonance equipment provided by the utility model is described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (7)
1. The nuclear magnetic resonance equipment comprises a magnet (5), and is characterized by further comprising a liquid nitrogen tank (2), a helium pipe (1), a vacuum interlayer pipe (4) and a helium cooling assembly (16); the liquid nitrogen tank (2) stores liquid nitrogen (201) for primarily cooling helium, and the helium cooling assembly (16) is used for cooling helium in the magnet (5); helium pipe (1) is inlet section (101), heat exchange section (102), linkage segment (103) and export section (104) along its extending direction in proper order, inlet section (101) linkage segment (103) with export section (104) are located outside liquid nitrogen tank (2), heat exchange section (102) are located within liquid nitrogen tank (2), linkage segment (103) are located in vacuum interlayer pipe (4), export section (104) stretch into inside magnet (5).
2. The nmr apparatus according to claim 1, wherein the bottom inside the magnet (5) is provided with an ultra-low temperature probe (9) to detect liquid helium temperature, the ultra-low temperature probe (9) being electrically connected to a temperature display (3) outside the magnet (5).
3. The nmr apparatus according to claim 2, wherein the helium cooling assembly (16) comprises a first cold head (7), the nmr apparatus further comprising a second cold head, the first cold head (7) and the second cold head being replaceably connected to the magnet (5), the first cold head (7) having a power greater than the second cold head.
4. The NMR apparatus according to any of claims 1-3, wherein the magnet (5) is provided with a level gauge (8) inside, the level gauge (8) being electrically connected to a level display (13) outside the magnet (5).
5. The nmr apparatus according to any of claims 1 to 3, wherein the heat exchange section (102) is of a helical structure.
6. The NMR apparatus according to any of claims 1 to 3, characterised in that the outer layer of the tank (2) is a vacuum jacket (202).
7. The NMR apparatus according to any of claims 1-3, wherein the magnet (5) is provided with an exhaust line (6), the exhaust line (6) is provided with a check valve (601), and the exhaust direction of the check valve (601) is from inside to outside of the magnet (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020667162.1U CN210690797U (en) | 2020-04-28 | 2020-04-28 | Nuclear magnetic resonance apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020667162.1U CN210690797U (en) | 2020-04-28 | 2020-04-28 | Nuclear magnetic resonance apparatus |
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| CN210690797U true CN210690797U (en) | 2020-06-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029618A (en) * | 2021-02-04 | 2021-06-25 | 浙江大学 | Method and device for identifying abnormality of magnet refrigeration system |
| CN114068132A (en) * | 2021-10-15 | 2022-02-18 | 江苏美时医疗技术有限公司 | Liquid helium circulation-based nuclear magnetic resonance ultrahigh field magnet circulation refrigeration device |
-
2020
- 2020-04-28 CN CN202020667162.1U patent/CN210690797U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029618A (en) * | 2021-02-04 | 2021-06-25 | 浙江大学 | Method and device for identifying abnormality of magnet refrigeration system |
| CN113029618B (en) * | 2021-02-04 | 2022-04-01 | 浙江大学 | Method and device for identifying abnormality of magnet refrigeration system |
| CN114068132A (en) * | 2021-10-15 | 2022-02-18 | 江苏美时医疗技术有限公司 | Liquid helium circulation-based nuclear magnetic resonance ultrahigh field magnet circulation refrigeration device |
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