A nuclear magnetic resonance apparatus magnet temperature control device

Abstract

The application relates to the technical field of nuclear magnetic resonance equipment, in particular to a nuclear magnetic resonance equipment magnet temperature control device which comprises a shell, a temperature sensor, an air supply head, a magnet arranged in the shell, a heat preservation layer made of heat preservation material fixedly connected to the bottom end of the shell and located outside the magnet, the air supply head being connected with an external air blower through a connecting hose and a rotary joint, an opening for placing a sample being arranged at the middle position of the top of the shell, an inner tooth ring being arranged at the bottom end of the shell, a driving gear meshing with the inner tooth ring being rotatably connected to the bottom of the shell, supporting legs being fixedly connected to the four corners of the bottom of the shell, and a bottom plate being fixedly connected to the bottom of each supporting leg. Through the mutual cooperation of the above structure, the air supply head can be driven to rotate in a ring shape during the temperature adjustment of the nuclear magnetic resonance device, and the air supply head can be driven to reciprocate up and down during the rotation, so that the heating uniformity of the temperature control device is further improved.

Description

Technical Field

[0001] This invention relates to the field of nuclear magnetic resonance (NMR) equipment technology, and more particularly to a magnet temperature control device for NMR equipment. Background Technology

[0002] Nuclear magnetic resonance (NMR) refers to a physical process in which the spin energy levels of atomic nuclei with non-zero magnetic moments undergo Zeeman splitting under the perpendicular action of a main magnetic field and a radio frequency field, and the atomic nuclei absorb radio frequency energy. It has many advantages that other detection methods cannot match, such as non-destructive testing and rich detection information. It is widely used in many fields such as biology, medicine, chemistry, food, petroleum, polymers, security inspection, architecture, and art. The magnetic field strength of the permanent magnet changes with the ambient temperature, which affects the detection of NMR signals. Therefore, a temperature control device is required to ensure the normal operation of the NMR equipment.

[0003] The prior art, disclosed in CN209280907U, discloses a temperature control device for nuclear magnetic resonance magnets. This device uses a ring-shaped moving mechanism to drive a fixed plate in a ring motion, which in turn drives the temperature control device to perform ring-shaped temperature control. A convenient sealing component then seals the sample orifice. This solves the problems of uneven heating area and poor heat preservation in existing magnetic resonance magnet temperature control devices. The new device for nuclear magnetic resonance magnets has the advantages of uniform heating area and good heat preservation, improving its temperature control effect and increasing the magnet temperature.

[0004] Although it can drive the temperature control device to rotate in a ring within the nuclear magnetic resonance equipment to increase the temperature control area, there are still some shortcomings in actual use. Since it can only drive the temperature control device to rotate on the same horizontal plane within the nuclear magnetic resonance, a large temperature difference will occur between the top and bottom during use, resulting in dead zones in the heating area. This requires a lot of energy to maintain the temperature, significantly increasing the cost of using the device.

[0005] Therefore, a magnet temperature control device for nuclear magnetic resonance equipment is proposed to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a magnet temperature control device for nuclear magnetic resonance equipment.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a magnetic resonance imaging (MRI) device magnet temperature control device, comprising a housing, a temperature sensor, and an air supply head, and a magnet disposed inside the housing. An insulation layer made of heat-insulating material is fixedly connected to the bottom of the housing and outside the magnet. The air supply head is connected to an external hot air blower via a connecting hose and a rotary joint. An opening for placing a sample is provided in the middle of the top of the housing. An internal gear ring is provided at the bottom of the housing. A drive gear meshing with the internal gear ring is rotatably connected to the bottom of the housing. Support legs are fixedly connected to the four corners of the bottom of the housing, and base plates are fixedly connected to the bottom of each support leg. A drive motor is fixedly connected to the bottom of the housing. The output end of the drive motor passes through the bottom of the housing and is fixedly connected to the bottom of the drive gear. An adjustment mechanism for driving the air supply head to move up and down during rotation is provided on the internal gear ring. The adjustment mechanism includes a sphere, a pair of fixed plates are fixedly connected to the top of the internal gear ring, a sliding block is provided between the fixed plates, the temperature sensor is fixedly connected to the side wall of the sliding block, the air supply head is set at the top of the sliding block, a rotating rod is rotatably connected to the side wall of the sliding block, the outer wall of the sphere is fixedly connected to the side wall of the rotating rod, and a number of upper inclined grooves are equidistantly opened on the inner wall of the housing, and a lower inclined groove is opened and connected to the upper inclined grooves on the inner wall of the housing. The drive motor starts and drives the drive gear to rotate, which in turn drives the meshing internal gear ring to rotate at the bottom of the housing, thereby driving the fixed plate and sliding block to rotate. At the same time, the ball moves in the upper and lower inclined grooves. As the internal gear ring continues to rotate, the ball is pushed upward by the compression of the upper inclined groove, which in turn drives the sliding block to slide upward between the fixed plates. At the same time, the return spring is gradually stretched, thereby driving the air blower head to move upward. Then, as the internal gear ring continues to rotate, when the ball reaches the connection point with the lower inclined groove, it will be immediately squeezed by the lower inclined groove and simultaneously pulled by the return spring, causing the ball and sliding block to gradually move downwards along the inclined surface of the lower inclined groove. This process is repeated to achieve the up-and-down reciprocating movement of the drive air head during its circular rotation, further improving the heating uniformity of the temperature control device.

[0008] In the above technical solution, the connection between the upper and lower inclined grooves is further designed as a smooth arc surface, which can improve the smoothness of the ball when it passes through, thereby improving the smoothness of the adjustment mechanism during operation. Two-thirds of the outer wall of the ball is located in the upper inclined groove. The ball is slidably connected to both the upper and lower inclined grooves. A return spring is fixedly connected between the bottom of the sliding block and the top of the inner toothed ring. By setting the return spring, a downward pulling force can be provided when the ball slides into the lower inclined groove, further improving the smoothness of the adjustment mechanism during operation.

[0009] In the above technical solution, further, the sidewalls of the fixed plate are provided with limit grooves, the two sides of the sliding block are fixedly connected to limit blocks and the limit blocks are slidably connected to the inside of the limit grooves, and the side of the limit blocks that is far away from each other is fixedly connected to a limit plate. By setting the limit grooves and limit blocks, the sliding of the sliding block can be guided, further improving the stability during the adjustment process. Moreover, by setting the limit plates, the position of the limit blocks can be restricted.

[0010] In the above technical solution, a ring-shaped T-groove is further provided at the bottom of the housing and below the internal toothed ring. A ring-shaped T-block is fixedly connected to the bottom of the internal toothed ring and the T-block is slidably connected to the inside of the T-groove. The T-groove and T-block can guide the sliding position of the internal toothed ring and further improve the stability of the adjustment mechanism during operation.

[0011] In the above technical solution, the outer wall of the housing is further provided with an air vent, and a one-way valve is provided inside the air vent. The air vent facilitates the discharge of gas, and the one-way valve prevents external gas from entering the housing through the air vent.

[0012] In the above technical solution, a top plate is fixedly connected to the top of the sliding block, an extension plate is fixedly connected to the side wall of the sliding block above the temperature sensor, a crossbar is provided at the top of the extension plate, the bottom of the crossbar near the sphere is rotatably connected to the top of the sliding block via a rotating shaft, a fixed seat is fixedly connected to the top of the crossbar away from the sphere, the air supply head is fixedly connected to the top of the fixed seat, an adjusting gear is rotatably connected to the side wall of the top plate, and a rack that meshes with the adjusting gear is fixedly connected to the side wall of one of the fixed plates.

[0013] In the above technical solution, a through groove is further provided at the bottom of the top plate, and the crossbar is set inside the through groove. The through groove is provided to avoid obstructing the swing of the crossbar and affecting the normal operation of the air supply head.

[0014] In the above technical solution, the top plate sidewall is further fixedly connected to a side plate, the top of the side plate is fixedly connected to a lower conical gear, the sidewall of the adjusting gear is fixedly connected to an upper conical gear that meshes with the lower conical gear, the bottom of the lower conical gear passes through the side plate and is fixedly connected to a disc, the top of the crossbar is provided with a recessed guide groove, and the bottom of the disc is fixedly connected to an eccentric part with a round pin, which is movably connected to the inside of the guide groove. During the operation of the temperature control device, the sliding block is driven to move up and down between the fixed plates by the adjustment mechanism. Subsequently, under the action of the rack, the meshing adjustment gear is rotated, which in turn drives the upper bevel gear to rotate, and then drives the meshing lower bevel gear to rotate. This causes the disc at the bottom of the side plate to rotate, and then drives the round pin to rotate inside the guide groove. Under the pressure of the round pin, the crossbar rotates around the pivot, causing the fixed base and the air supply head to swing back and forth in a fan shape. This allows the hot air to be delivered more evenly to every part, further improving the temperature control effect of the device.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the cooperation of the adjustment mechanism, internal gear ring, drive motor and drive gear, it can not only drive the air supply head to rotate in a ring during the temperature adjustment process in the nuclear magnetic resonance device, but also drive the air supply head to move up and down reciprocally during the rotation, thereby further improving the heating uniformity of the temperature control device.

[0016] 2. By adjusting the interaction of gears, discs, pins, and crossbars, the air supply head can be further driven to swing back and forth during the air supply process, thereby further improving the temperature control effect of the device. Attached Figure Description

[0017] Figure 1 This is a full-section three-dimensional structural diagram of the shell and magnet of the present invention. Figure 2 Appendix of the present invention Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a three-dimensional structural diagram of the side of the fixing plate and sliding block of the present invention; Figure 4 This is a schematic diagram of the overall appearance and structure of the adjustment mechanism of the present invention; Figure 5 This is a three-dimensional cross-sectional view of the front of the housing of the present invention; Figure 6 This is a bottom-view perspective view of the top plate and side plates of the present invention. Figure 7 This is a top-view three-dimensional structural diagram of the sliding block and extension plate of the present invention.

[0018] In the diagram: 1. Housing; 2. Magnet; 3. Insulation layer; 4. Temperature sensor; 5. Air outlet; 6. Connecting hose; 7. Internal gear ring; 8. Drive gear; 9. Drive motor; 10. Ball; 11. Fixing plate; 12. Sliding block; 13. Rotating rod; 14. Upper inclined groove; 15. Lower inclined groove; 16. Limiting groove; 17. Limiting block; 18. Limiting plate; 19. T-slot; 20. T-block; 21. Top plate; 22. Through slot; 23. Crossbar; 24. Fixing base; 25. Guide slot; 26. Adjusting gear; 27. Air outlet; 28. One-way valve; 29. ​​Rack; 30. Rotating shaft; 31. Extension plate; 32. Side plate; 33. Lower bevel gear; 34. Upper bevel gear; 35. Disc; 36. Pin; 37. Opening; 38. Support leg; 39. Base plate; 40. Return spring. Detailed Implementation

[0019] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0020] like Figures 1-7 The magnetic resonance imaging (MRI) device shown includes a magnet temperature control device, comprising a housing 1, a temperature sensor 4, and an air supply head 5, as well as a magnet 2 disposed inside the housing 1. An insulation layer 3 made of heat-insulating material is fixedly connected to the bottom of the housing 1 and outside the magnet 2. The air supply head 5 is connected to an external hot air blower through a connecting hose 6 and a rotary joint. The connection of the rotary joint can prevent the connecting hose 6 from getting tangled when the internal gear ring 7 drives the air supply head 5 to rotate. This is a mature technology in the prior art and will not be described in detail here. An opening 37 for placing a sample is opened in the middle of the top of the housing 1. An internal gear ring 7 is provided at the bottom of the housing 1. A drive gear 8 that meshes with the internal gear ring 7 is rotatably connected to the bottom of the housing 1. Support legs 38 are fixedly connected to the four corners of the bottom of the housing 1, and base plates 39 are fixedly connected to the bottom of the support legs 38. The support legs 38 and base plates 39 can support the housing 1 and prevent the drive motor 9 from causing obstruction during placement. The drive motor 9 is fixedly connected to the bottom of the housing 1. The output end of the drive motor 9 passes through the bottom of the housing 1 and is fixedly connected to the bottom of the drive gear 8. The internal gear ring 7 is provided with an adjustment mechanism for moving up and down during the rotation of the air blower head 5. An air outlet 27 is opened through the outer wall of the housing 1. A one-way valve 28 is provided inside the air outlet 27. The air outlet 27 facilitates the discharge of gas, and the one-way valve 28 prevents external gas from entering the interior of the housing 1 through the air outlet 27. The adjustment mechanism includes a sphere 10, a pair of fixed plates 11 fixedly connected to the top of an internal gear ring 7, a sliding block 12 between the fixed plates 11, a temperature sensor 4 fixedly connected to the side wall of the sliding block 12, an air supply head 5 located at the top of the sliding block 12, a rotating rod 13 rotatably connected to the side wall of the sliding block 12, the outer wall of the sphere 10 fixedly connected to the side wall of the rotating rod 13, and several upper inclined grooves 14 equidistantly formed on the inner wall of the housing 1, with lower inclined grooves formed on the inner wall of the housing 1 between the upper inclined grooves 14. 15 and connected to it, the connection between the upper inclined groove 14 and the lower inclined groove 15 is set as a smooth arc surface, and two-thirds of the outer wall of the sphere 10 is set in the upper inclined groove 14. The sphere 10 is slidably connected to both the upper inclined groove 14 and the lower inclined groove 15. A return spring 40 is fixedly connected between the bottom of the sliding block 12 and the top of the inner toothed ring 7. By setting the return spring 40, a downward pulling force can be provided when the sphere 10 slides into the lower inclined groove 15, thereby improving the smoothness of the adjustment mechanism during operation. When the temperature sensor 4 detects a decrease in the temperature inside the housing 1, it controls the external hot air blower to start and deliver hot air to the connecting hose 6 and the air outlet 5 via the controller. At the same time, it controls the drive motor 9 to start and drive the drive gear 8 to rotate. This causes the meshing internal gear ring 7 to rotate at the bottom of the housing 1, which in turn causes the fixed plate 11 and the sliding block 12 to rotate. Simultaneously, it causes the ball 10 to move within the upper inclined groove 14 and the lower inclined groove 15. As the internal gear ring 7 continues to rotate, the ball 10 is pushed upward by the compression of the upper inclined groove 14. This causes the sliding block 12 to slide upward between the fixed plates 11, while gradually stretching the return spring 40, thereby causing the air outlet 5 to move upward. Then, as the internal gear ring 7 continues to rotate, when the ball 10 reaches the connection point with the lower inclined groove 15, it will be immediately squeezed by the lower inclined groove 15 and pulled by the return spring 40, causing the ball 10 and the sliding block 12 to gradually move downward along the inclined surface of the lower inclined groove 15. This process is repeated to achieve the up-and-down reciprocating movement of the drive air head 5 during its annular rotation, further improving the heating uniformity of the temperature control device and reducing energy consumption.

[0021] To further improve the stability of the adjustment device during operation, limit grooves 16 are provided on the side walls of the fixed plate 11. Limit blocks 17 are fixedly connected to both sides of the sliding block 12, and the limit blocks 17 are slidably connected to the inside of the limit grooves 16. Limit plates 18 are fixedly connected to the side of the limit blocks 17 that is far away from each other. The limit grooves 16 and limit blocks 17 can guide the sliding of the sliding block 12, further improving the stability during the adjustment process. The limit plates 18 can also limit the position of the limit blocks 17. An annular T-slot 19 is provided at the bottom of the housing 1 and below the internal gear ring 7. An annular T-block 20 is fixedly connected to the bottom of the internal gear ring 7 and the T-block 20 is slidably connected to the inside of the T-slot 19. The T-slot 19 and the T-block 20 can guide the sliding position of the internal gear ring 7 and further improve the stability of the adjustment mechanism during operation.

[0022] To further improve the temperature control effect of the device, a top plate 21 is fixedly connected to the top of the sliding block 12, and an extension plate 31 is fixedly connected to the side wall of the sliding block 12 above the temperature sensor 4. A crossbar 23 is provided at the top of the extension plate 31. The bottom of the crossbar 23 near the ball 10 is rotatably connected to the top of the sliding block 12 through a rotating shaft 30. A fixed seat 24 is fixedly connected to the top of the crossbar 23 away from the ball 10. The air supply head 5 is fixedly connected to the top of the fixed seat 24. An adjusting gear 26 is rotatably connected to the side wall of the top plate 21. A rack 29 that meshes with the adjusting gear 26 is fixedly connected to the side wall of one of the fixed plates 11. A through groove 22 is provided at the bottom of the top plate 21. The through groove 22 is provided to avoid obstructing the swing of the crossbar 23 and affecting the normal operation of the air supply head 5. The crossbar 23 is located inside the through groove 22. A side plate 32 is fixedly connected to the side wall of the top plate 21. A lower conical gear 33 is fixedly connected to the top of the side plate 32. An upper conical gear 34 that meshes with the lower conical gear 33 is fixedly connected to the side wall of the adjusting gear 26. A disc 35 is fixedly connected to the bottom of the lower conical gear 33 through the side plate 32. A recessed guide groove 25 is provided at the top of the crossbar 23. A round pin 36 is fixedly connected to the eccentric part at the bottom of the disc 35 and the round pin 36 is movably connected inside the guide groove 25. During the operation of the temperature control device, the sliding block 12 is driven to move up and down between the fixed plates 11 by the adjustment mechanism. Subsequently, under the action of the rack 29, the meshing adjustment gear 26 is driven to rotate, which in turn drives the upper bevel gear 34 to rotate, and then drives the meshing lower bevel gear 33 to rotate, thereby driving the disc 35 at the bottom of the side plate 32 to rotate. Then, the round pin 36 is driven to rotate inside the guide groove 25. Under the pressure of the round pin 36, the crossbar 23 is driven to rotate around the rotating shaft 30, thereby causing the fixed base 24 and the air supply head 5 to swing back and forth in a fan shape, which can deliver the hot air more evenly to each place and further improve the temperature control effect of the device.

[0023] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0024] Other parts of this invention that are not detailed herein are all mature technologies in the prior art, and therefore will not be described in detail here.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnet temperature control device for a nuclear magnetic resonance (NMR) device, comprising a housing (1), a temperature sensor (4), and an air supply head (5), and a magnet (2) disposed inside the housing (1), wherein an insulation layer (3) made of insulation material is fixedly connected to the bottom of the housing (1) and outside the magnet (2), the air supply head (5) is connected to an external hot air blower via a connecting hose (6) and a rotary joint, and an opening (37) for placing a sample is provided at the middle of the top of the housing (1), characterized in that: The housing (1) has an internal gear ring (7) at the bottom. The bottom of the housing (1) is rotatably connected to a drive gear (8) that meshes with the internal gear ring (7). Support legs (38) are fixedly connected to the four corners of the bottom of the housing (1). The bottom of the support legs (38) is fixedly connected to a base plate (39). The bottom of the housing (1) is fixedly connected to a drive motor (9). The output end of the drive motor (9) passes through the bottom of the housing (1) and is fixedly connected to the bottom of the drive gear (8). The internal gear ring (7) is provided with an adjustment mechanism for driving the air blower head (5) to move up and down during rotation. The adjustment mechanism includes a sphere (10), a pair of fixed plates (11) are fixedly connected to the top of the internal toothed ring (7), a sliding block (12) is provided between the fixed plates (11), the temperature sensor (4) is fixedly connected to the side wall of the sliding block (12), the air supply head (5) is set at the top of the sliding block (12), a rotating rod (13) is rotatably connected to the side wall of the sliding block (12), the outer wall of the sphere (10) is fixedly connected to the side wall of the rotating rod (13), a number of upper inclined grooves (14) are equidistantly opened on the inner wall of the housing (1), and a lower inclined groove (15) is opened on the inner wall of the housing (1) between the number of upper inclined grooves (14) and connected to them.

2. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 1, characterized in that: The connection between the upper inclined groove (14) and the lower inclined groove (15) is set as a smooth arc surface, and two-thirds of the outer wall of the sphere (10) is set in the upper inclined groove (14). The sphere (10) is slidably connected to the upper inclined groove (14) and the lower inclined groove (15). A reset spring (40) is fixedly connected between the bottom of the sliding block (12) and the top of the inner toothed ring (7).

3. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 1, characterized in that: The sidewalls of the fixed plate (11) are provided with limit grooves (16), and the two sides of the sliding block (12) are fixedly connected with limit blocks (17), and the limit blocks (17) are slidably connected to the inside of the limit grooves (16). The side of the limit blocks (17) that is far away from each other is fixedly connected with a limit plate (18).

4. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 1, characterized in that: An annular T-groove (19) is provided at the bottom of the housing (1) and below the internal toothed ring (7). An annular T-block (20) is fixedly connected to the bottom of the internal toothed ring (7) and the T-block (20) is slidably connected to the inside of the T-groove (19).

5. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 1, characterized in that: The outer wall of the housing (1) is provided with an air outlet (27), and a one-way valve (28) is provided inside the air outlet (27).

6. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 1, characterized in that: The top of the sliding block (12) is fixedly connected to a top plate (21). The side wall of the sliding block (12) and above the temperature sensor (4) is fixedly connected to an extension plate (31). The top of the extension plate (31) is provided with a crossbar (23). The bottom of the crossbar (23) near the sphere (10) is rotatably connected to the top of the sliding block (12) via a rotating shaft (30). The top of the crossbar (23) away from the sphere (10) is fixedly connected to a fixed seat (24). The air blower (5) is fixedly connected to the top of the fixed seat (24). The side wall of the top plate (21) is rotatably connected to an adjusting gear (26). One of the fixed plates (11) is fixedly connected to a rack (29) that meshes with the adjusting gear (26).

7. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 6, characterized in that: The bottom of the top plate (21) is provided with a through groove (22), and the crossbar (23) is provided inside the through groove (22).

8. The magnet temperature control device for nuclear magnetic resonance equipment according to claim 6, characterized in that: The top plate (21) is fixedly connected to a side plate (32), and a lower bevel gear (33) is fixedly connected to the top of the side plate (32). The adjusting gear (26) is fixedly connected to an upper bevel gear (34) that meshes with the lower bevel gear (33). The bottom of the lower bevel gear (33) passes through the side plate (32) and is fixedly connected to a disc (35). The top of the crossbar (23) is provided with a recessed guide groove (25). A round pin (36) is fixedly connected to the eccentric part of the bottom of the disc (35) and the round pin (36) is movably connected to the inside of the guide groove (25).

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