Nitrogen cooling device based on superconducting magnet

Abstract

The invention relates to the technical field of superconducting magnets, in particular to a superconducting magnet-based nitrogen cooling device, which comprises a shell, a vacuum box, a nitrogen chamber, a nitrogen channel and a copper bar, a low-temperature nitrogen storage cavity is formed in the shell; the vacuum box is arranged in the low-temperature nitrogen storage cavity; and the nitrogen bath chamber is arranged in the vacuum cavity. The nitrogen channel is formed at the top of the vacuum box; the bottom of the nitrogen channel communicates with the nitrogen chamber; a nitrogen outlet hole is formed in the nitrogen channel. The copper bar penetrates through the nitrogen channel, and the bottom end of the copper bar is connected with the magnet through a current lead. And low-temperature nitrogen generated by volatilization of liquid nitrogen in the nitrogen bath chamber rises into the nitrogen channel and flows into the shell through the nitrogen outlet holes. When low-temperature nitrogen flows through the surfaces of the copper bar and the current lead, the copper bar and the current lead are cooled, and the volatilization amount of liquid nitrogen is reduced. The vacuum box can be isolated from the external environment through the shell, and the loss of cooling capacity in the nitrogen bathroom can be reduced. On the whole, the cooling capacity of the liquid nitrogen is fully utilized, and energy waste is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting magnets, and in particular to a nitrogen cooling device based on superconducting magnets. Background Art

[0002] After cooling, the magnet becomes a superconducting magnet with zero resistance. A strong magnetic field can be generated by passing an electric current through the magnet. Various cooling technologies have been developed to deal with different magnets, such as immersion in liquid nitrogen or cryogenic refrigerators.

[0003] Traditional nitrogen cooling devices do not fully utilize cooling capacity, resulting in energy waste. Summary of the invention

[0004] The invention provides a nitrogen cooling device based on a superconducting magnet, which is used to solve the problem that the traditional nitrogen cooling device does not fully utilize the cooling capacity, resulting in energy waste.

[0005] The present invention provides a nitrogen cooling device based on a superconducting magnet, comprising: The shell has a low-temperature nitrogen storage chamber formed therein; A vacuum box is arranged in the low-temperature nitrogen storage chamber and has a vacuum chamber formed therein; A nitrogen bath room, which is located in the vacuum chamber and is used to contain liquid nitrogen and magnets; A nitrogen channel is formed at the top of the vacuum box; the bottom of the nitrogen channel is connected to the nitrogen bath room; and a nitrogen outlet hole is provided on the nitrogen channel; The copper busbar is inserted into the nitrogen channel, and the bottom end is connected to the magnet through a current lead.

[0006] In some of the embodiments, a heat exchange groove is formed on at least one side of the copper busbar; a plurality of heat exchange fins are arranged at equal intervals in the heat exchange groove on each side.

[0007] In some of the embodiments, the top of the copper busbar passes through the top of the housing.

[0008] In some of the embodiments, a nitrogen outlet hole is formed on at least one side of the top of the nitrogen channel.

[0009] In some of the embodiments, a nitrogen path extension channel is formed on at least one side wall of the nitrogen channel.

[0010] In some of the embodiments, a claw vacuum pump is disposed on at least one side of the housing.

[0011] In some embodiments, it also includes: The liquid nitrogen inflow tube is arranged vertically, and the bottom end extends into the nitrogen bath chamber.

[0012] In some embodiments, it also includes: The liquid level meter is set vertically, with the bottom end extending into the nitrogen bath room.

[0013] The beneficial effects of the present invention are as follows: The nitrogen cooling device based on the superconducting magnet of the present invention is provided by arranging a shell, a vacuum box, a nitrogen bath room, a nitrogen channel and a copper bar. A low-temperature nitrogen storage chamber is formed inside the shell. The vacuum box is arranged in the low-temperature nitrogen storage chamber. A vacuum chamber is formed inside the vacuum box. The nitrogen bath room is arranged in the vacuum chamber. The nitrogen bath room is used to contain liquid nitrogen and the magnet to be cooled. The nitrogen channel is formed at the top of the vacuum box. The vacuum chamber is a closed chamber and is not connected to the nitrogen channel. The bottom of the nitrogen channel is connected to the nitrogen bath room through more than two drainage pipes. A nitrogen outlet hole is provided on the nitrogen channel. The copper bar is penetrated in the nitrogen channel, and the bottom end is connected to the magnet through a current lead. Current is passed into the magnet through the copper bar and the current lead to generate a strong magnetic field. The low-temperature nitrogen generated by the volatilization of liquid nitrogen in the nitrogen bath room rises along the drainage pipe to the nitrogen channel and flows into the shell through the nitrogen outlet hole. When low-temperature nitrogen flows through the surface of the copper busbar and the current lead, the copper busbar and the current lead are cooled, so as to prevent the copper busbar and the current lead from introducing a large amount of heat into the nitrogen bath room, thereby reducing the volatilization of liquid nitrogen and the loss of liquid nitrogen. By adding a shell, the vacuum box can be isolated from the external environment, so as to prevent the external environment from exchanging heat with the vacuum box, which is beneficial to reducing the loss of cold capacity in the nitrogen bath room and reducing the loss of liquid nitrogen. Moreover, the low-temperature nitrogen flowing into the low-temperature nitrogen storage chamber makes the temperature in the low-temperature nitrogen storage chamber much lower than the external environment, and creates a low-temperature environment on the periphery of the vacuum box, which is further beneficial to reducing the loss of cold capacity in the nitrogen bath room and reducing the amount of liquid nitrogen consumed by cooling the magnet. On the whole, the cold capacity of liquid nitrogen is fully utilized, which reduces the waste of energy and reduces the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the internal structure of some specific embodiments of a nitrogen cooling device based on a superconducting magnet of the present invention; Figure 2 yes Figure 1 The schematic diagram of the structure of the copper bar in the nitrogen cooling device based on superconducting magnets is shown; Figure 3 yes Figure 1 A cross-sectional view of a nitrogen channel in a nitrogen cooling device based on a superconducting magnet is shown; Figure 4 It is a schematic diagram of the structure of the high voltage introduction component.

[0015] In the accompanying drawings, 110, shell; 111, claw vacuum pump; 120, vacuum box; 130, nitrogen bath room; 140, nitrogen channel; 141, nitrogen outlet hole; 142, nitrogen path extension channel; 150, copper busbar; 151, heat exchange tank; 1511, heat exchange fins; 160, liquid nitrogen inlet pipe; 170, liquid level meter; 180, high-voltage introduction component; 181, fixing rod; 182, high-voltage equalizing ring; 183, high-voltage connecting terminal; 184, high-voltage introduction clamp; 190, current lead; 200, magnet. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] As described in the background technology, after the magnet is cooled, it becomes a superconducting magnet with zero resistance. A strong magnetic field can be generated by passing an electric current into the magnet. Various cooling technologies have emerged to deal with different magnets. The magnet can be cooled by immersion in liquid nitrogen or a cryogenic refrigerator. Traditional nitrogen cooling devices do not make full use of the cooling capacity, resulting in a waste of energy.

[0018] To solve the above problems, refer to Figure 1 , Figure 2 and Figure 3The present invention provides a nitrogen cooling device based on a superconducting magnet, comprising a shell 110, a vacuum box 120, a nitrogen bath room 130, a nitrogen channel 140 and a copper bar 150. A low-temperature nitrogen storage chamber is formed inside the shell 110. The vacuum box 120 is arranged in the low-temperature nitrogen storage chamber. A vacuum chamber is formed inside the vacuum box 120. The nitrogen bath room 130 is arranged in the vacuum chamber. The nitrogen bath room 130 is used to contain liquid nitrogen and a magnet 200 to be cooled. The nitrogen channel 140 is formed at the top of the vacuum box 120. It should be noted that the vacuum chamber is a closed chamber and is not connected to the nitrogen channel 140. The bottom of the nitrogen channel 130 is connected to the nitrogen bath room 130 through more than two drainage pipes. A nitrogen outlet hole 141 is provided on the nitrogen channel 140. The copper bar 150 is penetrated in the nitrogen channel 140, and the bottom end is connected to the magnet 200 through the current lead 190. Current is passed through the copper bar 150 and the current lead 190 to the magnet 200 to generate a strong magnetic field. The low-temperature nitrogen generated by the volatilization of liquid nitrogen in the nitrogen bath room 130 rises along the drainage pipe to the nitrogen channel 140, and flows into the housing 110 through the nitrogen outlet hole 141. When the low-temperature nitrogen flows through the surface of the copper bar 150 and the current lead 190, the copper bar 150 and the current lead 190 are cooled, and the copper bar 150 and the current lead 190 are prevented from introducing a large amount of heat into the nitrogen bath room 130, thereby reducing the volatilization amount of liquid nitrogen and reducing the loss of liquid nitrogen. By adding the housing 110, the vacuum box 120 can be isolated from the external environment, and heat exchange between the external environment and the vacuum box 120 can be avoided, which is conducive to reducing the loss of cold capacity in the nitrogen bath room 130 and reducing the loss of liquid nitrogen. Moreover, the low-temperature nitrogen flowing into the low-temperature nitrogen storage chamber makes the temperature inside the low-temperature nitrogen storage chamber much lower than the external environment, creating a low-temperature environment around the vacuum box 120, which is further conducive to reducing the loss of cold capacity in the nitrogen bath room 130 and reducing the amount of liquid nitrogen consumed in cooling the magnet 200. Overall, the cold capacity of liquid nitrogen is fully utilized, reducing energy waste and reducing operating costs.

[0019] Specifically, in the exemplary embodiment, a heat exchange groove 151 is formed on at least one side of the copper bar 150. A plurality of heat exchange fins 1511 are arranged at equal intervals in each side of the heat exchange groove 151. In this way, the contact area between the copper bar 150 and the low-temperature nitrogen is increased, and the cooling effect on the copper bar 150 is further improved, thereby further reducing the heat introduced into the nitrogen bath 130 by the copper bar 150.

[0020] In some embodiments, a heat exchange groove 151 is formed on one side of the copper bar 150. A plurality of heat exchange fins 1511 are arranged in the heat exchange groove 151 at equal intervals.

[0021] In other embodiments, Figure 2 As shown, heat exchange grooves 151 are formed on two opposite sides of the copper bar 150. A plurality of heat exchange fins 1511 are arranged at equal intervals in each heat exchange groove 151.

[0022] Preferably, the depth of the middle portion of the heat exchange groove 151 on each side is greater than the top and the bottom, which is beneficial to increase the retention time of the low-temperature nitrogen in the heat exchange groove 151 and further improve the cooling effect.

[0023] Preferably, the distance between two adjacent heat exchange fins 1511 on each side is 1 mm-10 mm to ensure the cooling effect.

[0024] Preferably, a sealing layer is formed outside the copper bus 150 , the current lead 190 and the magnet 200 to play a sealing and isolating role.

[0025] Preferably, the top of the copper busbar 150 passes through the top of the housing 110 , so as to facilitate the introduction of high voltage current into the copper busbar 150 .

[0026] Preferably, a first sealing member is provided at the top of the housing 110 to seal the contact point between the housing 110 and the copper bus 150 to prevent leakage of low-temperature nitrogen.

[0027] Preferably, a second sealing member is provided at the top of the nitrogen channel 140 to prevent leakage of low-temperature nitrogen at the contact point between the top of the nitrogen channel 140 and the copper bus 150 .

[0028] Preferably, the first sealing member and the second sealing member may be sealing rings or fillers.

[0029] In other embodiments, Figure 1 and Figure 4 As shown, the nitrogen cooling device based on superconducting magnet also includes a high-voltage introduction component 180. The high-voltage introduction component 180 is integrally mounted on the top of the housing 110. The high-voltage introduction component 180 includes a fixed rod 181, a high-voltage equalizing ring 182, a high-voltage connection terminal 183 and a high-voltage introduction clamp 184. The axis of the fixed rod 181 is vertically arranged, and the bottom end is fixed to the top of the housing 110. The high-voltage equalizing ring 182 is installed on the top of the fixed rod 181. The electric potential of each part of the high-voltage equalizing ring 182 is equal. The high-voltage connection terminal 183 is installed on the high-voltage equalizing ring 182 and is suitable for connection with a high-voltage device. The high-voltage device can input a high voltage to the high-voltage introduction component 180. The high-voltage introduction clamp 184 is fixed to the bottom end of the fixed rod 181 and can be connected to the copper bus 150.

[0030] In some embodiments, the nitrogen outlet hole 141 is formed on one side of the top of the nitrogen channel 140 , which is beneficial to prolonging the travel path of the low-temperature nitrogen and further prolonging the residence time of the low-temperature nitrogen in the nitrogen channel 140 .

[0031] In other embodiments, such as Figure 1As shown, there are two nitrogen outlet holes 141 formed at opposite sides of the top of the nitrogen channel 140 , which is beneficial to prolonging the travel path of the low-temperature nitrogen and further prolonging the residence time of the low-temperature nitrogen in the nitrogen channel 140 .

[0032] In some embodiments, a nitrogen path extension channel 142 is formed on a side wall of the nitrogen channel 140 , so that the travel path of the low-temperature nitrogen in the nitrogen channel 140 can be further extended, thereby extending the residence time of the low-temperature nitrogen in the nitrogen channel 140 .

[0033] In other embodiments, such as Figure 3 As shown, nitrogen path extension channels 142 are respectively formed on the opposite side walls of the nitrogen channel 140 , so that the travel path of the low-temperature nitrogen in the nitrogen channel 140 can be further extended, thereby extending the residence time of the low-temperature nitrogen in the nitrogen channel 140 .

[0034] In some embodiments, a claw vacuum pump 111 is provided at the lower portion of one side of the housing 110. The claw vacuum pump depressurizes the nitrogen flowing into the cryogenic nitrogen storage chamber, converts the cryogenic nitrogen into supercooled nitrogen, and further reduces the temperature in the cryogenic nitrogen storage chamber.

[0035] In other embodiments, such as Figure 1 As shown, claw vacuum pumps 111 are respectively provided at the lower parts of opposite sides of the housing 110. The claw vacuum pumps depressurize the nitrogen flowing into the cryogenic nitrogen storage chamber, converting the cryogenic nitrogen into supercooled nitrogen, further reducing the temperature in the cryogenic nitrogen storage chamber.

[0036] Specifically, in the example, Figure 1 As shown, the nitrogen cooling device based on the superconducting magnet also includes a liquid nitrogen storage bottle, a liquid nitrogen inflow pipe 160 and a liquid level meter 170. The liquid nitrogen inflow pipe 160 is vertically arranged, the top end is connected to the liquid nitrogen storage bottle, and the bottom end extends into the nitrogen bath room 130. The liquid nitrogen storage bottle is used to store liquid nitrogen, and can supply liquid nitrogen to the nitrogen bath room 130 through the liquid nitrogen inflow pipe 160. The liquid level meter 170 is vertically arranged, and the bottom end extends into the nitrogen bath room 130. The liquid level meter 170 is used to detect the liquid level height in the nitrogen bath room 130. When the liquid level meter 170 detects that the liquid level height in the nitrogen bath room 130 is lower than a preset value, the liquid nitrogen storage bottle replenishes liquid nitrogen into the nitrogen bath room 130 through the liquid nitrogen inflow pipe 160.

[0037] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0041] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A nitrogen cooling device based on a superconducting magnet, characterized in that: include: The shell has a low-temperature nitrogen storage chamber formed therein; A vacuum box is arranged in the low-temperature nitrogen storage chamber and has a vacuum chamber formed therein; A nitrogen bath room, arranged in the vacuum chamber, for containing liquid nitrogen and magnets; A nitrogen channel is formed at the top of the vacuum box; the bottom of the nitrogen channel is connected to the nitrogen bath room; and a nitrogen outlet hole is provided on the nitrogen channel; The copper busbar is inserted into the nitrogen channel, and the bottom end of the copper busbar is connected to the magnet through a current lead.

2. The nitrogen cooling device based on superconducting magnet according to claim 1, characterized in that: A heat exchange groove is formed on at least one side of the copper bar; a plurality of heat exchange fins are arranged at equal intervals in the heat exchange groove on each side.

3. The nitrogen cooling device based on superconducting magnet according to claim 1, characterized in that: The top of the copper busbar passes through the top of the shell.

4. The nitrogen cooling device based on superconducting magnet according to any one of claims 1 to 3, characterized in that: The nitrogen outlet hole is formed on at least one side of the top of the nitrogen channel.

5. The nitrogen cooling device based on superconducting magnet according to any one of claims 1 to 3, characterized in that: A nitrogen path extension flow channel is formed on at least one side wall of the nitrogen channel.

6. The nitrogen cooling device based on superconducting magnet according to any one of claims 1 to 3, characterized in that: A claw type vacuum pump is disposed on at least one side of the housing.

7. The nitrogen cooling device based on superconducting magnet according to any one of claims 1 to 3, characterized in that: Also includes: The liquid nitrogen inflow tube is vertically arranged, and the bottom end thereof extends into the nitrogen bath chamber.

8. The nitrogen cooling device based on superconducting magnet according to any one of claims 1 to 3, characterized in that: Also includes: The liquid level meter is vertically arranged, and the bottom end thereof extends into the nitrogen bath room.

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