A superconducting magnet system with low liquid helium loss

Abstract

The utility model relates to a kind of superconducting magnet systems of low liquid helium loss, including coil framework, superconducting coil, condensing cavity and refrigerator, and superconducting coil is arranged on the outer periphery of coil framework;Several annular heat exchange flow channels are opened in the inside of coil framework, and several heat exchange flow channels are evenly distributed along the axial direction of coil framework;Liquid-collecting cavity and gas-collecting cavity are opened in coil framework, and liquid-collecting cavity is located at the lowest point of coil framework, and gas-collecting cavity is located at the highest point of coil framework, and liquid-collecting cavity and gas-collecting cavity are communicated with all heat exchange flow channels respectively;Liquid-collecting cavity and gas-collecting cavity are communicated with condensing cavity, and cold head of refrigerator is inserted into condensing cavity.By integrating heat exchange flow channel into coil framework, liquid helium is transported using the liquid-collecting cavity of lower part of coil framework, and helium gas after heat exchange is recovered using the gas-collecting cavity of top of coil framework, and helium gas is condensed by condensing cavity and recycled, so as to reduce the occupied space of heat exchange pipeline, and the miniaturization of superconducting magnet is realized.

Description

Technical Field

[0001] This utility model relates to the field of superconducting magnet technology, and in particular to a superconducting magnet system with low liquid helium loss. Background Technology

[0002] Currently, the most common cooling method for cryogenic superconducting magnets used in industrial production is liquid helium immersion cooling. This involves absorbing heat from the superconducting coil through the vaporization of liquid helium. The vaporized helium then exchanges heat with the cold source to reliquefy the helium, utilizing this liquid-gas two-state cycle to allow the superconducting magnet to operate at a stable cryogenic temperature. Liquid helium is a scarce resource, and its price is heavily influenced by supply. Existing superconducting magnets use large quantities of liquid helium and have large liquid helium chamber volumes, while the volume of liquid helium actually participating in heat exchange is limited, resulting in a significant waste of liquid helium resources.

[0003] Patent CN113053615B discloses a helium micro-circulation cooling Dewar system for superconducting magnets. This system achieves micro-circulation of liquid helium within a heat exchange pipe located outside the superconducting coil, reducing helium usage and waste. However, placing the heat exchange pipe outside the superconducting coil not only increases the outer diameter of the superconducting magnet, limiting its miniaturization, but also results in a small heat exchange area and poor heat exchange efficiency.

[0004] Based on the above-mentioned technical problems, this application proposes a superconducting magnet system with low liquid helium loss. Utility Model Content

[0005] The purpose of this invention is to provide a superconducting magnet system with low liquid helium loss to solve the technical problems mentioned in the background art. This purpose is achieved through the following technical solution: A superconducting magnet system with low liquid helium loss includes a coil frame, a superconducting coil, a condenser cavity, and a cooler. The coil frame is a horizontally arranged cylindrical structure, and the superconducting coil is wound around the outer periphery of the coil frame. Several annular heat exchange channels are opened inside the coil frame, and the heat exchange channels are evenly distributed along the axial direction of the coil frame. A liquid collection cavity and a gas collection cavity are opened inside the coil frame. The liquid collection cavity is located at the lowest point of the coil frame, and the gas collection cavity is located at the highest point of the coil frame. Both the liquid collection cavity and the gas collection cavity are connected to all the heat exchange channels. The bottom of the condenser cavity is connected to the liquid collection cavity through a liquid delivery pipe, and the sidewall of the condenser cavity is connected to the gas collection cavity through a gas delivery pipe. The cold head of the cooler extends into the condenser cavity.

[0006] Furthermore, the coil frame includes an inner frame cylinder and an outer frame cylinder. The outer wall of the inner frame cylinder has several first heat exchange grooves arranged around it. A first gas collecting groove is located at the highest point of the outer wall of the inner frame cylinder, and a first liquid collecting groove is located at the lowest point of the outer wall. Both the first gas collecting groove and the first liquid collecting groove penetrate all the first heat exchange grooves along the axial direction of the inner frame cylinder. The inner wall of the outer frame cylinder has several second heat exchange grooves arranged around it. A second gas collecting groove is located at the highest point of the inner wall of the outer frame cylinder, and a second liquid collecting groove is located at the lowest point of the inner wall. Both the second gas collecting groove and the second liquid collecting groove penetrate all the second heat exchange grooves along the axial direction of the outer frame cylinder. The inner diameter of the outer frame cylinder matches the outer diameter of the inner frame cylinder. The first and second heat exchange grooves form a heat exchange channel, and the first and second liquid collecting grooves form a liquid collecting cavity. The first and second gas collecting grooves form a gas collecting cavity.

[0007] Furthermore, the outer wall of the skeleton outer cylinder is provided with a baffle ring, and the superconducting coil is wound between two adjacent baffle rings; a third heat exchange groove is opened inside the baffle ring, and the second liquid collection groove and the second gas collection groove are both connected to the third heat exchange groove; the third heat exchange groove and the outer wall of the skeleton inner cylinder form a side heat exchange flow channel.

[0008] Furthermore, the outer periphery of the superconducting coil is covered with a cooling strip, and a connecting plate is installed on the outer wall of the infusion tube, with the cooling strip connected to the connecting plate.

[0009] Furthermore, the bottom of the condensation chamber is inverted conical.

[0010] Furthermore, it also includes a gas storage tank, which is connected to the condensation chamber via a conduit.

[0011] The technical solutions provided in this application have at least the following technical effects or advantages: 1. By integrating the heat exchange channel into the coil frame, liquid helium is transported through the liquid collection cavity at the bottom of the coil frame and the helium gas after heat exchange is recovered through the gas collection cavity at the top of the coil frame. The helium gas is condensed through the condensation cavity and then recycled, thereby reducing the space occupied by the heat exchange pipe and realizing the miniaturization of the superconducting magnet. 2. By setting up heat exchange channels, side heat exchange channels, and cold guide strips, the heat exchange area of ​​the superconducting wire is increased, thereby improving the cooling effect. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1This is a schematic diagram of the superconducting magnet system structure according to an embodiment of this application; Figure 2 This is a schematic diagram of the inner ring structure of the skeleton in an embodiment of this application; Figure 3 This is a schematic diagram of the outer ring structure of the skeleton in an embodiment of this application; Figure 4 This is a schematic diagram of the coil frame structure in an embodiment of this application.

[0014] Reference numerals in the attached drawings: 1. Coil frame; 11. Inner cylinder of the frame; 111. First heat exchange tank; 112. First gas collecting tank; 113. First liquid collecting tank; 12. Outer cylinder of the frame; 121. Second heat exchange tank; 122. Second gas collecting tank; 123. Second gas collecting tank; 124. Retaining ring; 125. Third heat exchange tank; 2. Superconducting coil; 3. Condensation chamber; 31. Liquid delivery pipe; 311. Connecting plate; 32. Gas delivery pipe; 33. Conduit; 4. Refrigerator; 5. Gas storage tank. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0016] like Figure 1 The illustrated superconducting magnet system with low liquid helium loss includes a coil frame 1, a superconducting coil 2, a condenser 3, a cooler 4, and a gas storage tank 5. The coil frame 1 is a horizontally arranged cylindrical structure, and the superconducting coil 2 is wound around the outer periphery of the coil frame 1. Several annular heat exchange channels are evenly distributed along the axial direction of the coil frame 1 inside. A liquid collecting cavity and a gas collecting cavity are also provided inside the coil frame 1. The liquid collecting cavity is located at the lowest point of the coil frame 1, and the gas collecting cavity is located at the highest point of the coil frame 1. Both the liquid collecting cavity and the gas collecting cavity are connected to all the heat exchange channels.

[0017] like Figure 1 As shown, the condensing chamber 3 is a vertically installed cylindrical shell with an inverted conical bottom. The cooler 4 is installed on top of the condensing chamber 3, with its cold head extending into the condensing chamber 3. The bottom of the condensing chamber 3 is connected to the liquid collection chamber via a liquid inlet pipe 31, allowing liquid helium in the condensing chamber 3 to flow into the liquid collection chamber through the liquid inlet pipe 31. The sidewall of the condensing chamber 3 is connected to the gas collection chamber via a gas inlet pipe 32, allowing helium in the gas collection chamber to enter the condensing chamber 3 through the gas inlet pipe 32 and condense into liquid helium under the cooling effect of the cooler 4. The gas storage tank 5 is connected to the condensing chamber 3 via a conduit 33, on which a high-pressure gas pump is installed. When the superconducting magnet loses its quench, the high-pressure gas pump activates, drawing helium from the condensing chamber 3 into the gas storage tank 5 to prevent helium loss.

[0018] like Figures 1-4 As shown, the coil frame 1 includes an inner frame cylinder 11 and an outer frame cylinder 12. The inner frame cylinder 11 has a cylindrical structure, and a plurality of first heat exchange grooves 111 are formed on the outer wall of the inner frame cylinder 11. The first heat exchange grooves 111 are arranged around the circumference of the inner frame cylinder 11 and are evenly distributed along the axial direction of the inner frame cylinder 11. A first gas collecting groove 112 is formed at the highest point of the outer wall of the inner frame cylinder 11, and a first liquid collecting groove 113 is formed at the lowest point of the outer wall of the inner frame cylinder 11. The first gas collecting groove 112 and the first liquid collecting groove 113 both penetrate all the first heat exchange grooves 111 along the axial direction of the inner frame cylinder 11.

[0019] like Figures 2-4 As shown, the outer cylinder 12 of the skeleton has a cylindrical structure and is coaxially fitted onto the outside of the inner cylinder 11 of the skeleton. The inner wall of the outer cylinder 12 and the outer wall of the inner cylinder 11 are fitted with a clearance. The inner wall of the outer cylinder 12 is provided with a plurality of second heat exchange grooves 121, which are arranged around the circumference of the outer cylinder 12. The second heat exchange grooves 121 correspond one-to-one with the first heat exchange grooves 111, and the second heat exchange grooves 121 and the first heat exchange grooves 111 form a plurality of heat dissipation channels surrounding the coil skeleton 1.

[0020] like Figures 2-4 As shown, a second gas collecting groove 122 is formed at the highest point of the inner wall of the outer frame cylinder 12, and a second liquid collecting groove 123 is formed at the lowest point of the inner wall of the outer frame cylinder 12. Both the second gas collecting groove 122 and the second liquid collecting groove 123 extend through all the second heat exchange grooves 121 along the axial direction of the outer frame cylinder 12. The first liquid collecting groove 112 and the second liquid collecting groove 122 form a liquid collecting cavity, which is connected to the lowest point of all heat exchange channels. The first gas collecting groove 113 and the second gas collecting groove 123 form a gas collecting cavity, which is connected to the highest point of all heat exchange channels.

[0021] like Figure 3 , Figure 4 As shown, multiple retaining rings 124 are fixed to the outer wall of the outer frame cylinder 12, and the retaining rings 124 are arranged around the outer wall of the outer frame cylinder 12. The superconducting coil 2 is wound between two adjacent retaining rings 124, thereby limiting the position of the superconducting coil 2. Preferably, a third heat exchange groove 125 is formed inside the retaining ring 124, and the second liquid collection groove 123 and the second gas collection groove 122 are both connected to the third heat exchange groove 125. The third heat exchange groove 125 and the outer wall of the inner frame cylinder 11 form a side heat exchange channel.

[0022] During use, liquid helium in condensing chamber 3 enters the liquid collection chamber through liquid delivery pipe 31 under the action of gravity. It flows from bottom to top through heat exchange channel and side heat dissipation channel, cooling the superconducting coil 2 from the inner wall and side. The liquid helium that absorbs heat evaporates to form helium gas, which is collected in the gas collection chamber at the top and enters condensing chamber 3 through gas delivery pipe 32. Under the cooling of refrigerator 4, it re-condenses into liquid helium and circulates to cool the superconducting coil 2.

[0023] Preferably, the outer periphery of the superconducting coil 2 is covered with a cooling strip (not shown), and a connecting plate 311 is installed on the outer wall of the infusion tube 31. The cooling strip is connected to the connecting plate 311, thereby cooling the superconducting coil 2 from the outside and achieving overall cooling of the superconducting coil 2.

[0024] The technical solutions provided in this application have at least the following technical effects or advantages: 1. By integrating the heat exchange channel into the coil frame, liquid helium is transported through the liquid collection cavity at the bottom of the coil frame and the helium gas after heat exchange is recovered through the gas collection cavity at the top of the coil frame. The helium gas is condensed through the condensation cavity and then recycled, thereby reducing the space occupied by the heat exchange pipe and realizing the miniaturization of the superconducting magnet. 2. By setting up heat exchange channels, side heat exchange channels, and cold guide strips, the heat exchange area of ​​the superconducting wire is increased, thereby improving the cooling effect.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A superconducting magnet system with low liquid helium loss, characterized in that, The device includes a coil frame, a superconducting coil, a condenser cavity, and a cooler. The coil frame is a horizontally arranged cylindrical structure, and the superconducting coil is wound around the outer periphery of the coil frame. Several annular heat exchange channels are evenly distributed along the axial direction of the coil frame. A liquid collection cavity and a gas collection cavity are located within the coil frame. The liquid collection cavity is located at the lowest point of the coil frame, and the gas collection cavity is located at the highest point of the coil frame. Both the liquid collection cavity and the gas collection cavity are connected to all the heat exchange channels. The bottom of the condenser cavity is connected to the liquid collection cavity via a liquid delivery pipe, and the sidewall of the condenser cavity is connected to the gas collection cavity via a gas delivery pipe. The cold head of the cooler extends into the condenser cavity.

2. The low liquid helium loss superconducting magnet system according to claim 1, characterized in that, The coil frame includes an inner cylinder and an outer cylinder. The outer wall of the inner cylinder has several first heat exchange grooves arranged around it. A first gas collecting groove is located at the highest point of the outer wall of the inner cylinder, and a first liquid collecting groove is located at the lowest point of the outer wall. Both the first gas collecting groove and the first liquid collecting groove penetrate all the first heat exchange grooves along the axial direction of the inner cylinder. The inner wall of the outer cylinder has several second heat exchange grooves arranged around it. A second gas collecting groove is located at the highest point of the inner wall of the outer cylinder, and a second liquid collecting groove is located at the lowest point of the inner wall. Both the second gas collecting groove and the second liquid collecting groove penetrate all the second heat exchange grooves along the axial direction of the outer cylinder. The inner diameter of the outer cylinder matches the outer diameter of the inner cylinder. The first and second heat exchange grooves form the heat exchange channel, and the first and second liquid collecting grooves form the liquid collecting cavity. The first and second gas collecting grooves form the gas collecting cavity.

3. A low-liquid-helium-loss superconducting magnet system according to claim 2, characterized in that, The outer wall of the skeleton outer cylinder is provided with a baffle ring, and the superconducting coil is wound between two adjacent baffle rings; a third heat exchange groove is opened in the baffle ring, and the second liquid collection groove and the second gas collection groove are both connected to the third heat exchange groove; the third heat exchange groove and the outer wall of the skeleton inner cylinder form a side heat exchange channel.

4. The low liquid helium loss superconducting magnet system according to claim 1, characterized in that, The outer periphery of the superconducting coil is covered with a cooling strip, and a connecting plate is installed on the outer wall of the infusion tube. The cooling strip is connected to the connecting plate.

5. A low-liquid-helium-loss superconducting magnet system according to claim 1, characterized in that, The bottom of the condensation chamber is inverted conical.

6. A low-liquid-helium-loss superconducting magnet system according to claim 1, characterized in that, It also includes a gas storage tank, which is connected to the condensation chamber via a conduit.

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