Helmholtz magnetic field coil arrangement

Abstract

The application provides a Helmholtz magnetic field coil device, which comprises a laminated coil assembly, the laminated coil assembly comprises a plurality of conductive sheets, a plurality of insulating sheets and a plurality of sector sheets, the conductive sheets and the insulating sheets are alternately and laminatedly arranged, the conductive sheet is a non-closed ring, the conductive sheet is provided with a plurality of bolt holes, cooling water can flow along the axial direction of the laminated coil assembly through the bolt holes, the insulating sheet is a non-closed ring, the insulating sheet is provided with a first through hole, and the first through hole surrounds two bolt holes of the adjacent conductive sheet in the axial direction of the laminated coil assembly; the cooling water can flow along the circumferential direction of the laminated coil assembly in the first through hole; the sector sheet is arranged at the opening of the insulating sheet, the sector sheet makes the two adjacent conductive sheets conductive, and the conductive sheet is energized to generate a magnetic field; and a cooling water distribution part is used for distributing the cooling water to the plurality of bolt holes of the laminated coil assembly, and the cooling water distribution part and the laminated coil assembly are fixedly connected through bolts.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cold atom experiments, and particularly relates to a Helmholtz magnetic field coil device. BACKGROUND

[0002] Modern scientific experiments (ultra-cold atom research, condensed matter physics, etc.) have an increasing demand for high-intensity magnetic fields. In scientific laboratories or industrial circles, the main ways to generate magnetic fields include:

[0003] 1. Permanent magnets with specific structures.

[0004] 2. Using a wire wound layer by layer to generate a magnetic field by applying a current.

[0005] 3. Using superconducting materials as conductive materials to form a superconducting magnet to generate a magnetic field.

[0006] In the second way, if the magnetic field intensity needs to be increased, the number of turns of the coil can be increased, the current in the coil can be increased, and the distance between the coil and the experimental material can be reduced. However, the inductance of the coil will increase with the increase of the number of turns of the coil, and the heat generated by the coil will increase in a square multiple after the current is increased, which is not conducive to heat dissipation, and thus will affect the stability of related precision experiments. SUMMARY

[0007] The purpose of the present application is to provide a Helmholtz coil device with good cooling effect on the coil, which can generate an ultra-high magnetic field.

[0008] The embodiment of the present application provides a Helmholtz magnetic field coil device, which comprises:

[0009] A laminated coil assembly, the laminated coil assembly comprises a plurality of conductive sheets, a plurality of insulating sheets and a plurality of fan-shaped sheets, the conductive sheets and the insulating sheets are alternately laminated,

[0010] The conductive sheet is a non-closed ring with a conductive sheet opening, the conductive sheet is provided with a plurality of bolt holes, and the cooling water can flow along the axial direction of the laminated coil assembly through the bolt holes,

[0011] The insulating sheet is a non-closed ring with an insulating sheet opening, the insulating sheet is provided with a first through hole, and the first through hole surrounds two bolt holes of the adjacent conductive sheet in the axial direction of the laminated coil assembly, the first through hole and the bolt hole form a channel extending in the axial direction, the channel communicates the first through holes of the multiple insulating sheets, and the cooling water can flow in the circumferential direction of the laminated coil assembly in the first through hole,

[0012] The fan-shaped piece is arranged in the insulating piece opening, and, viewed along the axial direction, the fan-shaped piece is located at one end of the conductive piece opening of one of the conductive pieces adjacent to the fan-shaped piece, the fan-shaped piece is located at the other end of the conductive piece opening of the other of the conductive pieces adjacent to the fan-shaped piece, the fan-shaped piece and the conductive pieces are both capable of conducting electricity, the fan-shaped piece enables the two adjacent layers of the conductive pieces to be in conduction, and energization of the conductive pieces can generate a magnetic field; and

[0013] A cooling water distribution part for distributing the cooling water to the plurality of bolt holes of the laminated coil assembly, the cooling water distribution part and the laminated coil assembly being fixedly connected by bolts.

[0014] In at least one possible implementation, the cooling water distribution part is provided with an axial water inlet channel, an axial water outlet channel, a circumferential water inlet channel and a circumferential water outlet channel, the axial water inlet channel and the axial water outlet channel both extend through the cooling water distribution part along the axial direction, the circumferential water inlet channel and the circumferential water outlet channel both extend to form a ring shape along the circumferential direction, the axial water inlet channel and the circumferential water inlet channel are in communication, and the axial water outlet channel and the circumferential water outlet channel are in communication.

[0015] In at least one possible implementation, the circumferential water inlet channel is connected with a water inlet opening extending to a side wall of the cooling water distribution part, and the circumferential water outlet channel is connected with a water outlet opening extending to the side wall of the cooling water distribution part.

[0016] In at least one possible implementation, the insulating piece is provided with a second through hole, the second through hole and the bolt hole coincide, and the second through hole is located beside the insulating piece opening, and the fan-shaped piece is provided with a third through hole, viewed along the axial direction, the third through hole and the bolt hole coincide.

[0017] In at least one possible implementation, the inner diameters of the bolt hole, the second through hole and the third through hole are all greater than the diameter of the screw rod of the bolt, so as to form an annular channel around the screw rod of the bolt for the cooling water to flow through.

[0018] In at least one possible implementation, the outer periphery of the conductive piece is provided with a conductive piece notch groove, the outer periphery of the insulating piece is provided with an insulating piece notch groove, and the conductive piece notch groove and the insulating piece notch groove are aligned.

[0019] In at least one possible implementation, the cooling water distribution part is connected with a first wiring part and a second wiring part, and the laminated coil assembly further includes a base, the base and the insulating piece are in contact,

[0020] The first wiring part is in electrical conduction with the base through bolts,

[0021] The second wiring portion is electrically connected to the conductive sheet of the axial end of the laminated coil assembly away from the base through a bolt.

[0022] In at least one possible implementation, the first through hole, the second through hole and the third through hole are each provided with a sealing ring.

[0023] In at least one possible implementation, the circumferential water inlet channel and the circumferential water outlet channel are staggered in the radial direction and / or the axial direction of the cooling water distribution portion.

[0024] In at least one possible implementation, the bottom surface of the cooling water distribution portion facing the laminated coil assembly is provided with a positioning groove, the positioning groove is a circular ring, the inner diameter of the positioning groove is the same as the outer diameter of the laminated coil assembly, and the laminated coil assembly is embedded in the positioning groove.

[0025] By adopting the above technical solution, the cooling water can be used to dissipate heat to the multiple conductive sheets in parallel, and the heat dissipation effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structural schematic diagram of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0027] Figure 2 A structural schematic diagram of a cooling water distribution portion of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0028] Figure 3 An internal structural schematic diagram of a cooling water distribution portion of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0029] Figure 4 And Figure 5 A sectional view of a cooling water distribution portion of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0030] Figure 6 And Figure 7 A sectional view of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0031] Figure 8 A partial exploded view of a laminated coil assembly of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0032] Figure 9 A structural schematic diagram of a conductive sheet of a laminated coil assembly of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0033] Figure 10A structure diagram of an insulating sheet and a sector sheet of a laminated coil assembly of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0034] Figure 11 A structure diagram of an insulating sheet of a laminated coil assembly of a Helmholtz magnetic field coil device according to an embodiment of the present application is shown.

[0035] Figure 12 A temperature diagram of a Helmholtz magnetic field coil device according to an embodiment of the present application in different power and different flow rate of cooling water operation states is shown.

[0036] BRIEF DESCRIPTION OF DRAWINGS

[0037] 100 laminated coil assembly

[0038] 1 cooling water distribution part 11 axial water inlet passage 12 axial water outlet passage 13 circumferential water inlet passage 131 water inlet port 14 circumferential water outlet passage 141 water outlet port 15 mounting hole 16 first wiring part 17 second wiring part 18 second wiring part conductive bolt

[0039] 2 bolt 21 fastening bolt 22 conductive bolt

[0040] 3 base

[0041] 4 conductive sheet 41 conductive sheet opening 42 conductive sheet notch groove 43 bolt hole

[0042] 5 insulating sheet 51 insulating sheet opening 52 insulating sheet notch groove 53 first through hole 531 first sealing ring 54 second through hole 541 second sealing ring

[0043] 6 sector sheet 61 third through hole

[0044] A axial C circumferential DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, the specific embodiments of the present application are described in detail in this part in conjunction with the drawings. In addition to the various embodiments described in this part, the present application can be implemented in other different ways, and those skilled in the art can make corresponding improvements, modifications and substitutions without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed in this part. The scope of protection of the present application should be subject to the claims.

[0046] As shown in Figures 1 to 11 An embodiment of the present application proposes a Helmholtz magnetic field coil device, which comprises a cooling water distribution part 1 and a laminated coil assembly 100, the cooling water distribution part 1 and the laminated coil assembly 100 are fixedly connected, and the cooling water distribution part 1 can distribute cooling water to the passages inside the laminated coil assembly 100.

[0047] As Figures 1 to 7 shown, the cooling water distribution part 1 can be cylindrical as a whole, the cooling water distribution part 1 is provided with an axial water inlet channel 11, an axial water outlet channel 12, a circumferential water inlet channel 13 and a circumferential water outlet channel 14.

[0048] The cooling water distribution part 1 is provided with a through center hole, which increases the contact area of the cooling water distribution part 1 and the air, the air can flow through the center hole, which is beneficial to heat dissipation of the Helmholtz magnetic field coil device.

[0049] The axial water inlet channel 11 and the axial water outlet channel 12 both penetrate the cooling water distribution part 1 along the axial direction A of the cooling water distribution part 1, and the axial water inlet channel 11 and the axial water outlet channel 12 are both provided with a plurality of, for example, 4 axial water inlet channels 11 and 4 axial water outlet channels 12. On the circumferential direction C of the cooling water distribution part 1, the axial water inlet channel 11 and the axial water outlet channel 12 are arranged alternately.

[0050] As Figures 1 to 5 shown, the axial water inlet channel 11 and the axial water outlet channel 12 can pass through the bolt 2, and the cooling water distribution part 1 and the laminated coil assembly 100 can be fixedly connected by the bolt 2. The inner diameter of the axial water inlet channel 11 can be greater than the diameter of the screw rod of the bolt 2, and the screw rod of the bolt 2 and the inner wall of the axial water inlet channel 11 have a gap, and the inner diameter of the axial water outlet channel 12 can be greater than the diameter of the screw rod of the bolt 2, and the screw rod of the bolt 2 and the inner wall of the axial water outlet channel 12 have a gap, which can pass through the cooling water. The bolt 2 can be sleeved with a gasket and a sealing ring, and the gasket and the sealing ring are located at the head portion of the bolt 2, and the gasket and the sealing ring can seal the axial water inlet channel 11 and the axial water outlet channel 12, and the bolt 2 will not leak at the head position.

[0051] Optionally, the bolt 2 can be provided with threads only at the end portion away from the bolt head, and most of the portion of the bolt 2 including the portion located in the axial water inlet channel 11 and the axial water outlet channel 12 can be smooth, which is beneficial to the flow of cooling water.

[0052] As Figures 3 to 5As shown, both the circumferential water inlet channel 13 and the circumferential water outlet channel 14 extend along the circumferential direction C of the cooling water distribution section 1 to form a complete ring. The circumferential water inlet channel 13 is connected to an inlet 131 extending to the side wall of the cooling water distribution section 1, and the circumferential water outlet channel 14 is connected to a drain outlet 141 extending to the side wall of the cooling water distribution section 1. The inlet 131 and the drain outlet 141 can be spaced 90 degrees apart in the circumferential direction C of the cooling water distribution section 1. The axial water inlet channel 11 is connected to the circumferential water inlet channel 13, and the axial water outlet channel 12 is connected to the circumferential water outlet channel 14. After entering the circumferential water inlet channel 13 from the inlet 131, the cooling water can flow along the circumferential direction C and then flow along the axial direction A through multiple axial water inlet channels 11. After cooling the laminated coil assembly 100, the cooling water can flow back to the circumferential water outlet channel 14 along multiple axial water outlet channels 12, and then be discharged from the cooling water distribution section 1 from the drain outlet 141.

[0053] Between adjacent axial inlet channels 11 and axial outlet channels 12, circumferential inlet channels 13 and circumferential outlet channels 14 may be offset radially and / or axially (A), but circumferential inlet channels 13 and circumferential outlet channels 14 are not interconnected. (Refer to...) Figure 3 and Figure 4 ,from Figure 3 In the middle view, the parts where the circumferential water inlet channel 13 and the circumferential drainage channel 14 intersect can be staggered in the axial direction A. Therefore, although in Figure 4 While the circumferential water inlet channel 13 and the circumferential drainage channel 14 appear to be multiple broken segments, in reality they are still a complete ring.

[0054] See Figures 5 to 7 The cooling water distribution section 1 may be provided with a positioning groove on the bottom surface facing the stacked coil assembly 100. The positioning groove may be annular, and the inner diameter of the positioning groove is the same as the outer diameter of the stacked coil assembly 100. The stacked coil assembly 100 may be embedded in the positioning groove to position the cooling water distribution section 1 and the stacked coil assembly 100.

[0055] like Figures 1 to 3 As shown, the cooling water distribution section 1 can be provided with multiple, such as 8 mounting holes 15. The mounting holes 15 can be used for mounting bolts to pass through, thereby connecting the Helmholtz magnetic field coil device to the experimental equipment, such as a vacuum chamber for cold atom experiments.

[0056] like Figure 1 , Figure 6 and Figure 7 As shown, bolt 2 includes fastening bolt 21 and conductive bolt 22. There can be 7 fastening bolts 21 and 1 conductive bolt 22. The fastening bolt 21 can be made of titanium, titanium alloy or stainless steel, and the conductive bolt 22 can be made of copper or copper alloy.

[0057] The cooling water distribution part 1 is connected with a first wiring part 16 and a second wiring part 17, which are respectively used for connecting the positive and negative poles of a power supply.

[0058] The first wiring part 16 is connected to the cooling water distribution part 1 through a conductive bolt 22, and the first wiring part 16 is electrically connected to the base 3 through the conductive bolt 22. The first wiring part 16 can be connected to the positive pole of the power supply, so that the current is introduced into the base 3 at the bottom of the stacked coil assembly 100, and then the current can flow spirally from bottom to top.

[0059] The second wiring part 17 can be connected to the cooling water distribution part 1 through a second wiring part conductive bolt 18, and the second wiring part 17 is electrically connected to the conductive sheet 4 at the axial end of the stacked coil assembly 100 away from the base 3.

[0060] Further, the cooling water distribution part 1 can be integrally formed by 3D printing using a material such as a toughened resin. The 3D printing process facilitates the formation of a zigzag and complex circumferential water inlet channel 13 and a circumferential water outlet channel 14, which are beneficial for heat dissipation.

[0061] As shown in Figure 1 , Figures 6 to 11 , the stacked coil assembly 100 includes a base 3, a conductive sheet 4, an insulating sheet 5, and a sector sheet 6.

[0062] The conductive sheet 4 and the insulating sheet 5 are alternately stacked, i.e., one conductive sheet 4 is arranged between two adjacent insulating sheets 5, and one insulating sheet 5 is arranged between two adjacent conductive sheets 4. For example, the conductive sheet 4 can be provided with 23 layers, and the insulating sheet 5 can be provided with 24 pieces. If the stacked coil assembly 100 is damaged, it is easy to repair, and the repair cost is relatively low, only the corresponding sheet layer needs to be replaced.

[0063] The lowermost insulating sheet 5 of the stacked coil assembly 100 can be in contact with the base 3, and the uppermost insulating sheet 5 of the stacked coil assembly 100 can be in contact with the cooling water distribution part 1.

[0064] The base 3 can be provided with a threaded hole, and the bolt 2 can be screwed into the base 3 through the cooling water distribution part 1, the multiple layers of conductive sheets 4, the insulating sheets 5, and the sector sheets 6, so that the cooling water distribution part 1 and the base 3 can press the conductive sheets 4 and the insulating sheets 5 tightly, and press the conductive sheets 4 and the sector sheets 6 tightly. The base 3 can be made of brass, which has good electrical conductivity and high hardness and is not easy to deform.

[0065] As shown in Figure 8 and Figure 9As shown, the conductive sheet 4 is annular, and the conductive sheet 4 is provided with a conductive sheet opening 41, which makes the conductive sheet 4 form a non-closed annular shape. The conductive sheet opening 41 can make the current unable to form a closed loop along the conductive sheet 4 of a single layer. The outer periphery of the conductive sheet 4 is provided with a plurality of, for example, 7 conductive sheet notch grooves 42, and the 7 conductive sheet notch grooves 42 and one conductive sheet opening 41 can be uniformly arranged at equal intervals along the circumferential direction C of the conductive sheet 4. The width of the conductive sheet opening 41 and the width of the conductive sheet notch groove 42 can be the same.

[0066] As shown in Figure 6 , Figure 9 , the conductive sheet 4 is provided with a plurality of bolt holes 43, the inner diameter of the bolt hole 43 is greater than the diameter of the screw rod of the bolt 2, and the gap between the bolt hole 43 and the bolt 2 can form an annular channel S for the flow of cooling water in the axial direction A. The bolt hole 43 can be provided with 8, of which 4 bolt holes 43 are aligned with the axial water inlet channel 11, and the other 4 bolt holes 43 are aligned with the axial water outlet channel 12.

[0067] The conductive sheet 4 can be made of red copper, which has good electrical conductivity. The thickness of the conductive sheet 4 can be, for example, 0.5 mm.

[0068] As shown in Figure 8 , Figure 10 and Figure 11 , the insulating sheet 5 is annular, and the insulating sheet 5 is provided with an insulating sheet opening 51, which makes the insulating sheet 5 form a non-closed annular shape. The outer diameter of the insulating sheet 5 and the outer diameter of the conductive sheet 4 can be the same. In the circumferential direction C, the width of the insulating sheet opening 51 is greater than the width of the conductive sheet opening 41.

[0069] The outer periphery of the insulating sheet 5 can be provided with a plurality of, for example, 8 insulating sheet notch grooves 52, which are uniformly arranged at equal intervals along the circumferential direction C of the insulating sheet 6. The conductive sheet notch groove 42 and the insulating sheet notch groove 52 are aligned, thereby facilitating the accurate and rapid stacking assembly of the multiple layers of conductive sheets 4 and insulating sheets 5 at a specific angle, avoiding problems such as misalignment and distortion during assembly.

[0070] The insulating sheet 5 is provided with a first through hole 53, and the first through hole 53 of the insulating sheet 5 can surround two bolt holes 43 of the adjacent conductive sheet 4, and the cooling water can flow in opposite directions in the two bolt holes 43. The first through hole 53 can be provided with a plurality of, for example, 3 first through holes 53, and the cooling water can enter the first through hole 53 from the bolt hole 43, and then flow in the circumferential direction C of the insulating sheet 5 in the first through hole 53, and then flow out from the other bolt hole 43. In each first through hole 53 of the same insulating sheet 5, the flow direction of the cooling water can be the same.

[0071] The first through hole 53 is provided with a first sealing ring 531 inside, the first through hole 53 can be a waist circle or a banana-shaped circular arc, the shape of the first sealing ring 531 is the same as that of the first through hole 53, and the first sealing ring 531 can contact the inner circumferential surface of the first through hole 53. The first sealing ring 531 can be extruded and deformed by the upper and lower two layers of conductive sheets 4 of the insulating sheet 5, so that the cooling water cannot leak out from the edge of the first through hole 53.

[0072] The insulating sheet 5 is provided with a second through hole 54, which can be located beside the insulating sheet opening 51, and the second through hole 54 can be a circular hole. When viewed along the axial direction A, the second through hole 54 coincides with the bolt hole 43. The inner diameter of the second through hole 54 can be greater than the diameter of the screw rod of the bolt 2. The second through hole 54 is provided with a second sealing ring 541 inside, the second sealing ring 541 is a circular ring, and the second sealing ring 541 contacts the inner circumferential surface of the second through hole 54. The second sealing ring 541 can be extruded and deformed by the upper and lower two layers of conductive sheets 4 of the insulating sheet 5, so that the cooling water cannot leak out from the edge of the second through hole 54.

[0073] Referring to Figure 8 , when viewed along the axial direction A, the second through hole 54 coincides with the first through hole 53 of the insulating sheet 5 of the adjacent layer on the upper side of one side Figure 8 , and the second through hole 54 coincides with the third through hole 61 of the insulating sheet 5 of the adjacent layer on the lower side of the other side Figure 8 .

[0074] The insulating sheet 5 can be made of an insulating material such as polyimide.

[0075] As shown in Figure 8 and Figure 10 , the sector sheet 6 is provided on the insulating sheet opening 51, the inner diameter and the outer diameter of the sector sheet 6 are the same as those of the insulating sheet 5, and the sector sheet 6 and the insulating sheet 5 can form a closed ring.

[0076] The sector sheet 6 can be provided with a third through hole 61, which can be a circular hole. When viewed along the axial direction A, the third through hole 61 coincides with the bolt hole 43, and the inner diameter of the third through hole 61 is greater than the diameter of the screw rod of the bolt 2. The third through hole 61 is provided with a second sealing ring 541 inside, and the second sealing ring 541 contacts the inner circumferential surface of the third through hole 61. The second sealing ring 541 can be extruded and deformed by the upper and lower two layers of conductive sheets 4 of the sector sheet 6, so that the cooling water cannot leak out from the edge of the third through hole 61.

[0077] As shown in Figure 8As shown, the conductive sheet openings 41 of two adjacent conductive sheets 4 are staggered by a certain angle, for example 45 degrees, along the circumferential direction C. As viewed along the axial direction A of the stacked coil assembly 100, the sector sheet 6 is located at one end of the conductive sheet opening 41 of one conductive sheet 4 adjacent thereto, and the sector sheet 6 is located at the other end of the conductive sheet opening 41 of another conductive sheet 4 adjacent thereto, so that the current can flow from one conductive sheet 4 to another conductive sheet 4 through the sector sheet 6, but cannot pass through the insulating sheet 5. The sector sheet 6 and the conductive sheet 4 can be made of the same conductive material.

[0078] As viewed along the axial direction A, the axial water inlet passage 11, the bolt hole 43, the second through hole 54 and the third through hole 61 can be coincident, and the bolt 2 passes through these holes to form an annular passage S around the shank of the bolt 2 for the flow of cooling water. As viewed along the axial direction A, the axial water outlet passage 12, the bolt hole 43, the second through hole 54 and the third through hole 61 can be coincident, and the bolt 2 passes through these holes to form an annular passage S around the shank of the bolt 2 for the flow of cooling water.

[0079] The thickness of the sector sheet 6 can be the same as that of the insulating sheet 5, for example, the thickness of the insulating sheet 5 and the thickness of the sector sheet 6 can each be, for example, 0.3 mm.

[0080] The use of the Helmholtz magnetic field coil device will be described below.

[0081] In use of the Helmholtz magnetic field coil device of the present application, cooling water is fed into the cooling water distribution part 1 from the water inlet 131, and the cooling water is discharged from the water outlet 141 after circulation. In the cooling water distribution part, the cooling water circulates along the circumferential water inlet passage 13 and then enters the annular passage S of the stacked coil assembly 100 along the four axial water inlet passages 11. In the first through hole 53 of the insulating sheet 5, the cooling water can flow along the circumferential direction C for a while and then flow back to the axial water outlet passage 12 and the circumferential water outlet passage 14 of the cooling water distribution part 1 along another annular passage S, and then discharged through the water outlet 141. In the first through hole 53, the cooling water can directly contact the conductive sheet 4, and the contact area is large, which is conducive to heat dissipation of the conductive sheet 4. The electrical resistance of the cooling water is much higher than that of the conductive sheet 4 and the sector sheet 6, for example, the cooling water can be deionized water or distilled water, so that the current can flow through the conductive sheet 4 and the sector sheet 6 to form a loop, and no current backflow is formed in the cooling water.

[0082] The first wiring part 16 is connected to the positive pole of the power supply, and the second wiring part 17 is connected to the negative pole of the power supply. After the current passes through the conductive bolt 22 to the lowermost base 3, it spirally flows upward through the conductive sheet 4 and the sector sheet 6, and finally flows back to the negative pole of the power supply through the uppermost conductive sheet 4. The current flowing through the conductive sheet 4 and the sector sheet 6 can form a Helmholtz magnetic field.

[0083] The cooling water entering the first through hole 53 of the different layers of insulation sheet 5 is delivered through a plurality of annular channels S, and the cooling channels of the different layers of conductive sheet 4 are in parallel relationship, which can make the cooling water cool each layer of conductive sheet 4 at a lower temperature. The cooling channels of different parts of the same conductive sheet 4 are also in parallel relationship, which can make the cooling water cool different parts of each layer of conductive sheet 4 at a lower temperature. The cooling water is not cooled to the conductive sheet of one layer first and then to the conductive sheet of the next layer, which avoids the cooling water after the temperature of the conductive sheet of one layer is raised to continue to cool the conductive sheet downstream.

[0084] Figure 12 The temperature under different cooling water flow rates and different powers using the Helmholtz magnetic field coil device of the present application is shown.

[0085] In the figure, the abscissa is the operating power of the Helmholtz magnetic field coil, the ordinate is the temperature, the asterisk T represents no cooling water, the circle U represents a cooling water flow rate of 0.3 liters / minute, the square V represents a cooling water flow rate of 0.13 liters / minute, and the diamond W represents a cooling water flow rate of 0.45 liters / minute. It can be seen that using the Helmholtz magnetic field coil device of the present application to cool with cooling water has good cooling effect on the stacked coil assembly 100 under various flow rates and powers, and the temperature of the stacked coil assembly 100 can be kept below 25 degrees Celsius.

[0086] It should be understood that at least some aspects or features of the above-described embodiments, examples or implementations can be appropriately combined.

[0087] It can be understood that in the present application, when the number of components or members is not particularly limited, the number can be one or more, and here the plurality means two or more. For the case where the number of components or members is described as a specific number such as two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not limiting, and it can be understood as a plurality, i.e. two or more, but this does not mean that the present application excludes the case of one.

[0088] In the present application, unless specifically stated or limited otherwise, the terms "mounting", "assembly", "assembling", "connecting", "connection", "coupling", "joining", "abutting", "communicating", "communicate", "conducting", "fixing", "fastening" and the like shall be interpreted broadly, for example, they can be direct or indirect. For example, in terms of connection, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection via an intermediate medium; it can be internal communication of two elements, or interaction relationship between two elements, unless specifically stated or limited otherwise. For example, in terms of communication / conducting, it can be direct communication / conducting, or indirect communication / conducting via an intermediate medium. The specific meanings of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

[0089] In the present application, unless specifically stated or limited otherwise, one member being disposed in / mounted in / located in / contained in / placed in another member, etc. can be either of the following two cases: a part or most of the one member is located in the other member; and the one member is completely contained in the other member.

[0090] Although the present application has been described in detail using the above embodiments, it is obvious to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as modified embodiments without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the present specification is for the purpose of illustration only, and does not have any limiting meaning on the present application.

Claims

1. A Helmholtz magnetic field coil device, characterized in that, include: A stacked coil assembly (100) includes multiple conductive sheets (4), multiple insulating sheets (5), and multiple sector-shaped sheets (6), wherein the conductive sheets (4) and the insulating sheets (5) are alternately stacked. The conductive sheet (4) is a non-closed ring with a conductive sheet opening (41). The conductive sheet (4) is provided with multiple bolt holes (43), through which cooling water can flow along the axial direction (A) of the stacked coil assembly (100). The insulating sheet (5) is a non-closed annular shape with an opening (51). The insulating sheet (5) has a first through hole (53). When viewed along the axial direction (A) of the multilayer coil assembly (100), the first through hole (53) surrounds two bolt holes (43) of the adjacent conductive sheet (4). The first through hole (53) and the bolt holes (43) form a channel extending along the axial direction (A). This channel connects the first through hole (53) of the multilayer insulating sheet (5). Cooling water can flow along the circumferential direction (C) of the multilayer coil assembly (100) through the first through hole (53). The fan-shaped plate (6) is disposed at the opening (51) of the insulating sheet. Viewed along the axial direction (A), the fan-shaped plate (6) is located at one end of the opening (41) of the conductive sheet (4) adjacent to it, and at the other end of the opening (41) of the conductive sheet (4) adjacent to it. Both the fan-shaped plate (6) and the conductive sheet (4) are conductive. The fan-shaped plate (6) connects the two adjacent layers of conductive sheets (4), thereby generating a magnetic field when current is applied to the conductive sheet (4); and Cooling water distribution section (1) is used to distribute the cooling water to the plurality of bolt holes (43) of the stacked coil assembly (100). The cooling water distribution section (1) and the stacked coil assembly (100) are fixedly connected by bolts (2). The inner diameter of the bolt hole (43) is larger than the diameter of the bolt (2).

2. The Helmholtz magnetic field coil device according to claim 1, characterized in that, The cooling water distribution section (1) is provided with an axial water inlet channel (11), an axial water outlet channel (12), a circumferential water inlet channel (13) and a circumferential water outlet channel (14). The axial water inlet channel (11) and the axial water outlet channel (12) both penetrate the cooling water distribution section (1) along the axial direction (A). The circumferential water inlet channel (13) and the circumferential water outlet channel (14) both extend along the circumferential direction (C) to form a ring. The axial water inlet channel (11) and the circumferential water inlet channel (13) are connected. The axial water outlet channel (12) and the circumferential water outlet channel (14) are connected.

3. The Helmholtz magnetic field coil device according to claim 2, characterized in that, The circumferential water inlet channel (13) is connected to an inlet (131) extending to the side wall of the cooling water distribution section (1), and the circumferential drainage channel (14) is connected to a drain outlet (141) extending to the side wall of the cooling water distribution section (1).

4. The Helmholtz magnetic field coil device according to claim 1, characterized in that, The insulating sheet (5) is provided with a second through hole (54), which coincides with the bolt hole (43). The second through hole (54) is located next to the opening (51) of the insulating sheet. The fan-shaped sheet (6) is provided with a third through hole (61). When viewed along the axial direction (A), the third through hole (61) coincides with the bolt hole (43).

5. The Helmholtz magnetic field coil device according to claim 4, characterized in that, The inner diameters of the second through hole (54) and the third through hole (61) are both larger than the diameter of the bolt (2) shank, thereby forming an annular channel (S) around the bolt (2) shank for the cooling water to flow through.

6. The Helmholtz magnetic field coil device according to claim 1, characterized in that, The conductive sheet (4) has a conductive sheet notch (42) on its outer periphery, and the insulating sheet (5) has an insulating sheet notch (52) on its outer periphery. The conductive sheet notch (42) and the insulating sheet notch (52) are aligned.

7. The Helmholtz magnetic field coil device according to claim 1, characterized in that, The cooling water distribution section (1) is connected to a first wiring section (16) and a second wiring section (17). The stacked coil assembly (100) also includes a base (3), which contacts the insulating sheet (5). The first wiring part (16) is electrically connected to the base (3) via bolts. The second wiring portion (17) is electrically connected by the bolt and the conductive sheet (4) at the axial end of the stacked coil assembly (100) away from the base (3).

8. The Helmholtz magnetic field coil device according to claim 4, characterized in that, A sealing ring is provided inside the first through hole (53), the second through hole (54) and the third through hole (61).

9. The Helmholtz magnetic field coil device according to claim 2, characterized in that, The circumferential water inlet channel (13) and the circumferential drainage channel (14) are offset radially and / or axially from the cooling water distribution section (1).

10. The Helmholtz magnetic field coil device according to claim 1, characterized in that, The cooling water distribution section (1) has a positioning groove on its bottom surface facing the stacked coil assembly (100). The positioning groove is annular, and the inner diameter of the positioning groove is the same as the outer diameter of the stacked coil assembly (100). The stacked coil assembly (100) is embedded in the positioning groove.

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