A cooling device for a nuclear magnetic resonance radio frequency coil

Abstract

The utility model is suitable for the technical field of nuclear magnetic resonance machine, provides a kind of cooling device for nuclear magnetic resonance radio frequency coil, including;Nuclear magnetic resonance machine;Mounting groove, the mounting groove is established in the top of right end of nuclear magnetic resonance machine, and is provided with protective cover plate;Cooling circulation groove, the cooling circulation groove is established in the rear end of mounting groove, and is placed with nuclear cold head;Negative pressure structure, the negative pressure structure is arranged at the upper end of cooling circulation groove, and liquid nitrogen is extracted;Plugging structure, the plugging structure is arranged in the middle part of cooling circulation groove, and is connected with negative pressure structure transmission, and the cooling circulation groove is plugged.Compared with prior art, the beneficial effects of the utility model are: when using, by setting negative pressure structure in the upper end of cooling circulation groove, and then when disassembling and replacing nuclear cold head, the liquid nitrogen moved to the upper end of cooling circulation groove is continuously extracted and stored under negative pressure, to reduce the leakage and waste of liquid nitrogen.

Description

Technical Field

[0001] This utility model belongs to the field of nuclear magnetic resonance imaging (NMR) machine technology, and in particular relates to a cooling device for NMR radio frequency coils. Background Technology

[0002] Magnetic resonance imaging (MRI) is a novel medical imaging technology that has excellent diagnostic capabilities for solid organs such as the brain, thyroid, liver, kidneys, spleen, uterus, and prostate, as well as the heart and major blood vessels.

[0003] An MRI machine mainly consists of components such as radio frequency coils, superconducting magnets, and auxiliary equipment. Because an MRI machine generates a lot of heat during operation, excessively high temperatures can cause the radio frequency coils and other equipment to malfunction. Therefore, multiple cooling structures are used to continuously cool the MRI machine. Traditional MRI machines use vaporized liquid helium for direct cooling and are equipped with a magnetic resonance cold head. Helium is circulated and cooled by compression and expansion to ensure that the magnet coils are in a superconducting state close to absolute zero. However, in order to maintain the effectiveness of the magnetic resonance cold head, it needs to be replaced regularly. However, liquid nitrogen leakage can occur when replacing the magnetic resonance cold head, and because liquid nitrogen is expensive, the replacement process results in significant losses.

[0004] Therefore, how to provide a cooling device for nuclear magnetic resonance radio frequency coils is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a cooling device for nuclear magnetic resonance radio frequency coils, which aims to solve the problems mentioned in the background art.

[0006] This invention is implemented as follows: a cooling device for a nuclear magnetic resonance radio frequency coil, comprising;

[0007] Nuclear magnetic resonance imaging (NMR) machine;

[0008] The mounting slot is located at the top right end of the MRI machine and is equipped with a protective cover.

[0009] A cooling circulation tank is located at the rear end of the mounting tank and houses a nuclear magnetic cold head.

[0010] A negative pressure structure is installed at the upper end of the cooling circulation tank to extract liquid nitrogen;

[0011] A sealing structure is provided, which is located in the middle of the cooling circulation tank and is connected to the negative pressure structure to seal the cooling circulation tank.

[0012] Preferably, the sealing structure includes a sealing block, a first transmission gear, a second movable groove, a second transmission gear ring, an adjusting screw, and an adjusting rack. The second movable groove is located on the outer side of the middle of the cooling circulation groove and communicates with the inside of the cooling circulation groove. The second transmission gear ring is movably disposed on the outer side of the second movable groove. The sealing block is arranged in a circumferential array on the inner side of the second movable groove. The adjusting screw is movably installed on the outer end of the sealing block. The outer end of the adjusting screw is connected to the top of the inner side of the second transmission gear ring. The first transmission gear is driven on the left side of the negative pressure structure. The adjusting rack is fixedly installed on the bottom of the first transmission gear and is connected to the top of the second transmission gear ring.

[0013] Preferably, the negative pressure structure includes a second transmission gear ring, a first movable groove, a lifting and receiving cylinder, a piston ring, and a drive gear. The first movable groove is located on the outer side of the top of the cooling circulation groove. The inner circumferential array of the first movable groove has grooves, and the surface of the grooves has a first through hole. The lifting and receiving cylinder is slidably disposed inside the first movable groove, and the inner circumferential array of the cylinder has protrusions, and the surface of the protrusions has a second through hole. The inner side of the lifting and receiving cylinder has a receiving cavity. A spring is fixedly installed at the top of the outer end of the lifting and receiving cylinder, and the spring is fixedly connected to the top of the outer side of the first movable groove. The piston ring is slidably disposed inside the receiving cavity, and a traction screw is movably installed in the middle. A driven gear is fixedly installed at the bottom of the traction screw. A motor is disposed on the rear side of the mounting groove. The drive gear is movably installed at the bottom of the traction screw. A first transmission gear ring is disposed on the outer side of the bottom of the first movable groove and is connected to the outer side of the driven gear. A second transmission gear is disposed between the first transmission gear ring and the drive gear. The side of the second transmission gear ring is connected to the sealing structure.

[0014] Preferably, the number and position of the first through hole and the second through hole are correspondingly set, and the initial positions of the first through hole and the second through hole are staggered.

[0015] Preferably, the top of the inner side of the second transmission gear ring is inclined, the top of the second transmission gear ring is inclined, and both the top of the inner side of the second transmission gear ring and the top of the second transmission gear ring are provided with tooth grooves.

[0016] Preferably, both the receiving cavity and the piston ring are annular, and the thickness of the piston ring is equal to the thickness of the receiving cavity.

[0017] Preferably, the sealing block is configured as a one-third circle, and the diameter of the sealing block is greater than the inner diameter of the cooling circulation tank.

[0018] Compared with the prior art, the beneficial effects of this utility model are: during use, by setting a negative pressure structure at the upper end of the cooling circulation tank, when the NMR cold head is disassembled and replaced, the liquid nitrogen that moves to the upper end of the cooling circulation tank is continuously extracted and stored under negative pressure, so as to reduce the leakage and waste of liquid nitrogen.

[0019] Meanwhile, by setting a sealing structure in the middle of the cooling circulation tank that is connected to the negative pressure structure, the middle of the cooling circulation tank can be automatically sealed when the NMR cold head is disassembled or replaced, thereby disconnecting the connection between the inside and outside of the cooling circulation tank to prevent the liquid nitrogen filled in the NMR machine from continuously leaking from the cooling circulation tank, thus further avoiding the leakage and waste of liquid nitrogen. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 A schematic diagram of the overall appearance structure of a cooling device for a nuclear magnetic resonance radio frequency coil provided in an embodiment of this utility model;

[0022] Figure 2 A top view of the overall appearance structure of a cooling device for a nuclear magnetic resonance radio frequency coil provided in an embodiment of this utility model;

[0023] Figure 3 A right-side cross-sectional view of a cooling device for a nuclear magnetic resonance radio frequency coil provided in an embodiment of this utility model;

[0024] Figure 4 A schematic diagram of the main cross-sectional structure of a cooling device for a nuclear magnetic resonance radio frequency coil provided in an embodiment of this utility model;

[0025] Figure 5 A schematic diagram of the overall appearance of the sealing structure of a cooling device for a nuclear magnetic resonance radio frequency coil provided in an embodiment of this utility model;

[0026] Figure 6 A top-view diagram showing the disassembled sealing structure of a cooling device for a nuclear magnetic resonance radio frequency coil, provided for an embodiment of this utility model;

[0027] Figure 7 This is a top-view diagram showing the disassembled sealing structure of a cooling device for a nuclear magnetic resonance radio frequency coil, provided as an embodiment of the present invention.

[0028] In the diagram: 1-Nuclear Magnetic Resonance Machine, 2-Mounting Slot, 3-Protective Cover Plate, 4-Cooling Circulation Slot, 5-Nuclear Magnetic Cold Head, 6-First Movable Slot, 7-Lifting Storage Cylinder, 8-Spring, 9-Piston Ring, 10-First Through Hole, 11-Second Through Hole, 12-Traction Screw, 13-Driving Gear, 14-Sealing Block, 15-Driven Gear, 16-First Transmission Gear Ring, 17-First Transmission Gear, 18-Second Movable Slot, 19-Second Transmission Gear Ring, 20-Adjusting Gear, 21-Adjusting Screw, 22-Motor, 23-Groove, 24-Protrusion, 25-Storage Cavity, 26-Second Transmission Gear. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The diagram shown is a structural schematic of a cooling device for a nuclear magnetic resonance radio frequency coil according to an embodiment of the present invention, comprising:

[0032] Nuclear magnetic resonance imaging machine 1;

[0033] Mounting slot 2 is located on the top right end of the MRI machine 1 and is equipped with a protective cover plate 3.

[0034] Cooling circulation tank 4 is located at the rear end of mounting tank 2 and houses nuclear magnetic cold head 5;

[0035] The negative pressure structure is located at the upper end of the cooling circulation tank 4 to extract liquid nitrogen.

[0036] The sealing structure is located in the middle of the cooling circulation tank 4 and is connected to the negative pressure structure to seal the cooling circulation tank 4.

[0037] In this embodiment of the utility model, when in use, when the nuclear magnetic cold head 5 is removed from the cooling circulation tank 4, the negative pressure structure is activated to extract the leaked liquid nitrogen, and the sealing structure is activated simultaneously to seal the cooling circulation tank 4.

[0038] By setting up a negative pressure structure, leaked liquid nitrogen can be extracted and stored to reduce leakage and waste. Furthermore, by setting up a sealing machine, the cooling circulation tank 4 can be sealed to further prevent leakage and waste of liquid nitrogen.

[0039] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in a preferred embodiment of this utility model, the sealing structure includes a sealing block 14, a first transmission gear 17, a second movable groove 18, a second transmission gear ring 19, an adjusting screw 21, and an adjusting gear 20. The second movable groove 18 is located on the outer side of the middle part of the cooling circulation groove 4 and communicates with the inside of the cooling circulation groove 4. The second transmission gear ring 19 is movably disposed on the outer side of the second movable groove 18. The sealing block 14 is arranged in a circumferential array on the inner side of the second movable groove 18. The adjusting screw 21 is movably installed on the outer end of the sealing block 14, and the outer end of the adjusting screw 21 is connected to the top of the inner side of the second transmission gear ring 19. The first transmission gear 17 is driven on the left side of the negative pressure structure. The adjusting gear 20 is fixedly installed on the bottom of the first transmission gear 17 and is connected to the top of the second transmission gear ring 19.

[0040] In this embodiment of the utility model, when the first transmission gear ring 16 rotates, it will drive the first transmission gear 17 on its outer side to rotate. Then, through the adjusting gear 20 at the bottom of the first transmission gear 17, it will drive the second transmission gear ring 19 in the second movable groove 18 to rotate synchronously. This will drive the adjusting screw 21 in the second movable groove 18 to rotate, thereby changing the position of the sealing block 14 at the inner end of the adjusting screw 21, and thus sealing the cooling circulation groove 4.

[0041] By setting a sealing structure in the middle of the cooling circulation tank 4 that is connected to the negative pressure structure, the middle of the cooling circulation tank 4 can be automatically sealed when the NMR cold head 5 is disassembled and replaced, thereby disconnecting the connection between the inside and outside of the cooling circulation tank 4, so as to prevent the liquid nitrogen filled in the NMR machine 1 from continuously leaking from the cooling circulation tank 4, and further avoiding the leakage and waste of liquid nitrogen.

[0042] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, in a preferred embodiment of this utility model, the negative pressure structure includes a second transmission gear ring 19, a first movable groove 6, a lifting and receiving cylinder 7, a piston ring 9, and a drive gear 13. The first movable groove 6 is located on the outer side of the top of the cooling circulation groove 4. A groove 23 is arranged in a circular array on the inner side of the first movable groove 6, and a first through hole 10 is arranged in a circular array on the surface of the groove 23. The lifting and receiving cylinder 7 is slidably disposed inside the first movable groove 6, and a protrusion 24 is arranged in a circular array on its inner side. A second through hole 11 is arranged in a circular array on the surface of the protrusion 24. A receiving cavity 25 is formed on the inner side of the lifting and receiving cylinder 7, and the top of the outer end of the lifting and receiving cylinder 7... A spring 8 is fixedly installed and is fixedly connected to the top of the outer side of the first movable groove 6. A piston ring 9 is slidably disposed inside the receiving cavity 25 and a traction screw 12 is movably installed in the middle. A driven gear 15 is fixedly installed at the bottom of the traction screw 12. A motor 22 is disposed on the rear side of the mounting groove 2. A driving gear 13 is movably installed at the bottom of the traction screw 12. A first transmission gear ring 16 is disposed on the outer side of the bottom of the first movable groove 6 and is connected to the outer side of the driven gear 15. A second transmission gear 26 is disposed between the first transmission gear ring 16 and the driving gear 13. The side of the second transmission gear ring 19 is connected to the sealing structure.

[0043] In this embodiment of the invention, when the NMR cold head 5 is removed, under the traction of the spring 8 at the outer end of the first movable groove 6, the lifting and receiving cylinder 7 causes its inner protrusion 24 to automatically rise along the groove 23 at the top of the cooling circulation groove 4. This aligns and connects the second through hole 11 on the inner surface of the lifting and receiving cylinder 7 with the first through hole 10 at the top of the cooling circulation groove 4. Then, due to the presence of the traction screw 12, the piston ring 9 moves out of the receiving cavity 25 inside the lifting and receiving cylinder 7, creating a negative pressure within the receiving cavity 25, which in turn cools the cylinder. Liquid nitrogen moved to the upper end of the circulation tank 4 is initially extracted. At the same time, the motor 22 on the top of the nuclear magnetic resonance machine 1 is started, which drives the drive gear 13 to rotate, thereby driving the second transmission gear 26 to rotate synchronously, which in turn drives the first transmission gear ring 16 to rotate. This causes the driven gear 15 inside the first transmission gear ring 16 to rotate synchronously, which in turn drives the traction screw 12 to rotate, causing the piston ring 9 to continue to descend. This creates a continuous negative pressure in the receiving cavity 25, continuously extracting the leaked liquid nitrogen.

[0044] By setting a negative pressure structure at the upper end of the cooling circulation tank 4, when the NMR cold head 5 is disassembled and replaced, the liquid nitrogen that moves to the upper end of the cooling circulation tank 4 is continuously extracted and stored under negative pressure to reduce the leakage and waste of liquid nitrogen.

[0045] like Figure 3 , Figure 4 , Figure 6 and Figure 7As shown, in a preferred embodiment of the present invention, the number and position of the first through hole 10 and the second through hole 11 are correspondingly arranged, and the initial positions of the first through hole 10 and the second through hole 11 are offset.

[0046] In this embodiment of the utility model, when in use, by setting the number and position of the first through hole 10 and the second through hole 11 to correspond, it is convenient to extract liquid nitrogen. The initial positions of the first through hole 10 and the second through hole 11 are misaligned, so that when the storage cavity 25 is not in use, no liquid nitrogen will enter and leakage will occur.

[0047] like Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in a preferred embodiment of the present invention, the top of the inner side of the second transmission gear ring 19 is inclined, the top of the second transmission gear ring 19 is inclined, and both the top of the inner side of the second transmission gear ring 19 and the top of the second transmission gear ring 19 are provided with tooth grooves.

[0048] In this embodiment of the utility model, when in use, the top of the inner side of the second transmission gear ring 19 is tilted, and the top of the second transmission gear ring 19 is tilted. Gear grooves are provided on both the top of the inner side of the second transmission gear ring 19 and the top of the second transmission gear ring 19. When the adjusting gear rod 20 rotates, it will drive the second transmission gear ring 19 to rotate, which will indirectly drive the adjusting screw 21 to rotate and adjust the position of the sealing block 14.

[0049] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, in a preferred embodiment of the present invention, both the receiving cavity 25 and the piston ring 9 are annular, and the thickness of the piston ring 9 is equal to the thickness of the receiving cavity 25.

[0050] In this embodiment of the invention, when in use, both the receiving cavity 25 and the piston ring 9 are set to be annular, and the thickness of the piston ring 9 is equal to the thickness of the receiving cavity 25. Thus, when the piston ring 9 descends, a negative pressure is formed in the receiving cavity 25 to extract liquid nitrogen.

[0051] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, in a preferred embodiment of the present invention, the sealing block 14 is configured as a one-third circle, and the diameter of the sealing block 14 is greater than the inner diameter of the cooling circulation tank 4.

[0052] In this embodiment of the invention, when in use, the sealing block 14 is set to a one-third circle shape, and the diameter of the sealing block 14 is greater than the inner diameter of the cooling circulation groove 4, so that the cooling circulation groove 4 can be sealed when the sealing block 14 is closed.

[0053] The present invention provides a cooling device for a nuclear magnetic resonance radio frequency coil in the above embodiments. When in use, the protective cover plate 3 on the top mounting slot 2 on the right side of the nuclear magnetic resonance machine 1 is opened, thereby exposing the nuclear magnetic cold head 5, so that the nuclear magnetic cold head 5 can be removed and replaced, and the cooling circulation tank 4 is temporarily connected to the outside.

[0054] When the nuclear magnetic cold head 5 is removed, under the traction of the spring 8 at the outer end of the first movable groove 6, the lifting and receiving cylinder 7 drives the inner protrusion 24 to rise automatically along the groove 23 at the top of the cooling circulation groove 4, thereby aligning and connecting the second through hole 11 on the inner surface of the lifting and receiving cylinder 7 with the first through hole 10 at the top of the cooling circulation groove 4.

[0055] Due to the presence and constraint of the traction screw 12, the piston ring 9 is moved out of the storage cavity 25 inside the lifting storage cylinder 7, which in turn creates a negative pressure in the storage cavity 25, thereby initially extracting the liquid nitrogen that has been moved to the upper end of the cooling circulation tank 4.

[0056] The motor 22 on top of the MRI machine 1 is started, which drives the drive gear 13 to rotate, thereby driving the second transmission gear 26 to rotate synchronously, which in turn drives the first transmission gear ring 16 to rotate, so that the driven gear 15 inside it rotates synchronously with the rotation of the first transmission gear ring 16, which in turn drives the traction screw 12 to rotate, causing the piston ring 9 to continue to descend, thereby continuously forming a negative pressure in the receiving cavity 25, and continuously extracting the leaked liquid nitrogen;

[0057] At the same time, when the first transmission gear ring 16 rotates, it will drive the first transmission gear 17 on its outer side to rotate, and then drive the second transmission gear ring 19 in the second movable groove 18 to rotate synchronously through the adjusting gear 20 at the bottom of the first transmission gear 17.

[0058] When the second transmission gear ring 19 rotates, it will drive the adjusting screw 21 in the second movable groove 18 to rotate, which will cause the sealing block 14 at the inner end of the adjusting screw 21 to move from the outside to the inside, thereby sealing the cooling circulation groove 4 and preventing liquid nitrogen from continuously leaking from the cooling circulation groove 4.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling device for a nuclear magnetic resonance radio frequency coil, characterized in that, include; Nuclear magnetic resonance imaging (NMR) machine (1); The mounting slot (2) is located on the top of the right end of the MRI machine (1) and is equipped with a protective cover plate (3). Cooling circulation tank (4), the cooling circulation tank (4) is opened at the rear end of the mounting tank (2) and a nuclear magnetic cold head (5) is placed thereon; A negative pressure structure is provided at the upper end of the cooling circulation tank (4) to extract liquid nitrogen; A sealing structure is provided in the middle of the cooling circulation tank (4) and is connected to the negative pressure structure to seal the cooling circulation tank (4).

2. The cooling device for a nuclear magnetic resonance radio frequency coil according to claim 1, characterized in that, The sealing structure includes a sealing block (14), a first transmission gear (17), a second movable groove (18), a second transmission gear ring (19), an adjusting screw (21), and an adjusting gear rod (20). The second movable groove (18) is located on the outer side of the middle part of the cooling circulation groove (4) and communicates with the inside of the cooling circulation groove (4). The second transmission gear ring (19) is movably disposed on the outer side of the second movable groove (18). The sealing block (14) is arranged in a circumferential array on the inner side of the second movable groove (18). The adjusting screw (21) is movably installed on the outer end of the sealing block (14). The outer end of the adjusting screw (21) is connected to the top of the inner side of the second transmission gear ring (19). The first transmission gear (17) is driven on the left side of the negative pressure structure. The adjusting gear rod (20) is fixedly installed on the bottom of the first transmission gear (17) and is connected to the top of the second transmission gear ring (19).

3. The cooling device for a nuclear magnetic resonance radio frequency coil according to claim 1, characterized in that, The negative pressure structure includes a second transmission gear ring (19), a first movable groove (6), a lifting and storing cylinder (7), a piston ring (9), and a drive gear (13). The first movable groove (6) is located on the outer side of the top of the cooling circulation groove (4). The inner circumferential array of the first movable groove (6) has grooves (23). The surface of the grooves (23) has a first through hole (10). The lifting and storing cylinder (7) is slidably disposed inside the first movable groove (6), and the inner circumferential array of the cylinder has protrusions (24). The surface of the protrusions (24) has a second through hole (11). The inner side of the lifting and storing cylinder (7) has a storage cavity (25). A spring (8) is fixedly installed on the top of the outer end of the lifting and storing cylinder (7). The spring (8) is fixedly connected to the top of the outer side of the first movable groove (6). The piston ring (9) is slidably disposed inside the receiving cavity (25), and a traction screw (12) is movably installed in the middle. A driven gear (15) is fixedly installed at the bottom of the traction screw (12). A motor (22) is disposed on the rear side of the mounting groove (2). The driving gear (13) is movably installed at the bottom of the traction screw (12). A first transmission gear ring (16) is disposed on the outer side of the bottom of the first movable groove (6) and is connected to the outer side of the driven gear (15). A second transmission gear (26) is disposed between the first transmission gear ring (16) and the driving gear (13). The side of the second transmission gear ring (19) is connected to the sealing structure.

4. A cooling device for a nuclear magnetic resonance radio frequency coil according to claim 3, characterized in that, The number and position of the first through hole (10) and the second through hole (11) are set in a corresponding manner, and the initial positions of the first through hole (10) and the second through hole (11) are set out to be offset.

5. A cooling device for a nuclear magnetic resonance radio frequency coil according to claim 4, characterized in that, The top of the inner side of the second transmission gear ring (19) is inclined, and the top of the second transmission gear ring (19) is inclined. Both the top of the inner side of the second transmission gear ring (19) and the top of the second transmission gear ring (19) are provided with tooth grooves.

6. A cooling device for a nuclear magnetic resonance radio frequency coil according to claim 4, characterized in that, Both the receiving cavity (25) and the piston ring (9) are annular, and the thickness of the piston ring (9) is equal to the thickness of the receiving cavity (25).

7. A cooling device for a nuclear magnetic resonance radio frequency coil according to claim 2, characterized in that, The sealing block (14) is set to one-third circular shape, and the diameter of the sealing block (14) is greater than the inner diameter of the cooling circulation tank (4).

Images