Superconducting magnet helium supplementing device
By designing the interface flange structure and automatic control mechanism of the superconducting magnet helium replenishment device, the problems of frost formation at the infusion port, connection difficulties, and pressure imbalance were solved, thereby improving the convenience and safety of liquid helium infusion.
Patent Information
- Application Number
- CN202511720258.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-02-10
AI Technical Summary
Existing superconducting magnet helium replenishment processes suffer from problems such as frosting at the infusion port, connection difficulties, pressure imbalance requiring manual adjustment, and high operational risks.
A superconducting magnet helium replenishment device was designed, which uses an interface flange to divide the cavity into a closed cavity and a connecting cavity, with a piston cover plate for sliding connection. It is equipped with a one-way valve, a flow guiding mechanism, a feedback mechanism and a locking mechanism to achieve automated control and enhanced safety of liquid helium transportation.
It improves the convenience and safety of liquid helium infusion, reduces manpower support, avoids helium condensation and pressure imbalance, and enhances the reliability and safety of the connection.
Smart Images
Figure CN121497964A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of superconducting magnet technology, and more specifically, to a superconducting magnet helium replenishment device. Background Technology
[0002] A superconducting magnet is an electromagnet made by using a type II superconductor with a high transition temperature and a particularly high critical magnetic field to form a coil at low temperatures. Its main characteristics are that there is no electrical loss caused by the resistance of the wires, nor is there any magnetic loss caused by the presence of an iron core. It has great practical value and is widely used in industry and scientific research. However, it must operate at liquid helium temperatures, which makes it more expensive. During the preparation and operation of the superconducting magnet, liquid helium needs to be filled and replenished intermittently in order to start the superconducting magnet and ensure its stable operation over a long period of time.
[0003] Typical liquid helium magnets have numerous pre-installed operating valves at the Dewar flange, including the liquid helium inlet flange. During magnet operation, these are usually sealed using a blind flange. Before replenishing the helium, the blind flange needs to be opened. Once the blind flange is open, the magnet's interior is directly connected to the outside air, causing a large amount of helium gas to rush out of the inlet. This direct contact with the outside air causes a large amount of ice crystals to condense at the inlet, requiring repeated de-icing before the inlet tubing can be connected. Furthermore, the large amount of cryogenic helium gas overflowing makes inserting and removing the liquid helium inlet tubing difficult and extremely dangerous.
[0004] Meanwhile, to ensure that the internal pressure balance does not become unbalanced due to boiling and evaporation of liquid helium during replenishment, on-site workers need to closely monitor the pressure gauge of the superconducting magnet and manually and meticulously control the liquid helium output valve throughout the entire process based on the pressure gauge data. This work is extremely tedious during the two to three-hour liquid helium replenishment process, and performing this delicate work for a long time can lead to mental distraction or inability to concentrate. If a work error occurs, the balance of the magnet may be broken, resulting in a loss of supercharge and economic losses. Summary of the Invention
[0005] This invention aims to solve the problems of frosting at the infusion port, difficult connection, pressure imbalance relying on manual adjustment, and high operational risks in the existing helium replenishment process.
[0006] To address the aforementioned problems, this invention provides a superconducting magnet helium replenishment device, comprising: an interface flange, wherein the interface flange has a closed cavity in the upper part and a connecting cavity in the lower part, the closed cavity and the connecting cavity being connected, and the inner diameter of the closed cavity being larger than the inner diameter of the connecting cavity; a piston cover plate, slidably connected to the closed cavity, a liquid delivery cylinder being fixedly fixed through the middle position of the piston cover plate, a through hole being opened on the outer side of the liquid delivery cylinder near the bottom, and a one-way valve being fixedly connected to the top of the liquid delivery cylinder; a flow guiding mechanism, disposed in the connecting cavity, used to block the connecting cavity under normal conditions, and to keep the through hole connected to the connecting cavity when the piston cover plate moves down to block the top of the connecting cavity; a feedback mechanism, disposed above the piston cover plate, used to adaptively control the flow rate of liquid helium during delivery according to the pressure change inside the interface flange; and a locking mechanism, disposed on the outer side of the interface flange, used to lock the position of the piston cover plate when the piston cover plate moves down to block the top of the connecting cavity.
[0007] The superconducting magnet helium replenishment device provided by this invention has, but is not limited to, the following beneficial effects compared with the prior art: To address the issues of frosting at the infusion port, difficult connections, reliance on manual adjustment for pressure imbalance, and high operational risks during existing helium replenishment processes, this invention uses an interface flange as the connection base between the device and the superconducting magnet. Internally, it is divided into a closed cavity and a connecting cavity, with the closed cavity having a larger inner diameter to provide sliding space for the piston cover. The piston cover can slide up and down along the closed cavity, with a centrally fixed infusion cylinder serving as the liquid helium delivery channel. A one-way valve at the top prevents backflow of liquid helium, and a through-hole at the bottom is used for liquid helium diversion. The flow guiding mechanism normally seals the connecting cavity to prevent internal helium leakage. Before helium replenishment, the external helium replenishment tube is connected to the top of the infusion cylinder. After connection, the piston cover is pressed down until it seals the top of the connecting cavity. At this point, the locking mechanism locks the piston cover in place. Simultaneously, the flow guiding mechanism ensures that the through-hole on the outside of the infusion cylinder and the connecting cavity remain connected. The one-way valve can then be opened for infusion. When the helium replenishment tube head releases liquid helium, a large amount of liquid helium rushes into the infusion cylinder. The liquid helium flowing into the infusion cylinder will be discharged through the through hole and overflow into the interface flange through the flow guiding mechanism, and then flow into the part of the magnet body that needs to be immersed in liquid helium. During the inflow process, a large amount of liquid helium will continuously boil and evaporate, generating a large amount of helium gas inside the interface flange, which will increase the internal pressure of the interface flange. At this time, the feedback mechanism can adaptively control the flow rate of liquid nitrogen infusion according to the internal pressure of the interface flange, which greatly reduces the high-intensity manual support during the infusion process and improves the safety of the infusion process. Moreover, this helium guiding method directly eliminates the need to manually open the infusion tube opening, which would cause the internal helium gas to rush out and make it difficult to connect the helium replenishment tube head. It also avoids the situation of ice forming at the infusion tube opening, which greatly improves the convenience and safety of helium tube connection during infusion work.
[0008] Furthermore, the flow guiding mechanism includes an annular plate, a fixed cylinder, a sliding cylinder, and a reset assembly. The annular plate is fixedly installed on the inner wall of the connecting cavity, the infusion cylinder passes through the annular plate, the fixed cylinder is fixedly installed on the lower surface of the annular plate, the sliding cylinder is slidably disposed inside the fixed cylinder, and the bottom end of the infusion cylinder is in contact with the bottom inner wall of the sliding cylinder. The outer side of the sliding cylinder has a first drainage groove that is evenly spaced and arranged in a ring, and the outer side of the fixed cylinder has a second drainage groove that is evenly spaced and arranged in a ring. When the piston cover plate blocks the connecting cavity, the first drainage groove and the second drainage groove are aligned. The reset assembly is disposed at the bottom of the sliding cylinder and is used to drive the sliding cylinder to move upward and reset synchronously when the infusion cylinder moves upward. A sealing assembly for maintaining a seal is provided between the sliding cylinder and the fixed cylinder.
[0009] Furthermore, the reset assembly includes a reset rod, a reset plate, and a reset spring. The reset rod is fixedly installed at the bottom of the slide cylinder, the reset plate is fixedly installed at the bottom end of the reset rod, one end of the reset spring is fixedly connected to the upper surface of the reset plate, and the other end is fixedly connected to the lower surface of the ring plate.
[0010] Furthermore, the sealing assembly includes a sealing ring, the inner wall of the fixed cylinder has an annular groove, the sealing ring is disposed in the annular groove, and the inner wall of the sealing ring is in contact with the outer wall of the slide cylinder.
[0011] Furthermore, a sealing ring is fixedly installed on the lower surface of the piston cover plate, and when the piston cover plate moves down to the top of the sealing cavity, the sealing ring fits against the bottom inner wall of the sealed cavity.
[0012] Furthermore, it also includes a cooling assembly for cooling the helium gas inside the interface flange. The cooling assembly includes a cold head, a cooling ring, and a cooling guide column. The cold head is located on the outside of the interface flange. The cooling ring is sleeved on the outside of the fixed cylinder and located inside the connecting cavity. One end of the cooling guide column is fixedly connected to the cold head, and the other end is fixedly connected to the cooling ring.
[0013] Furthermore, the feedback mechanism includes a manifold, a guide tube, a feedback tube, and an expansion ring. The manifold is sleeved on the outside of the infusion cylinder and located above the piston cover. The guide tube is distributed in a ring at equal intervals, with one end communicating with the outside of the manifold and the other end penetrating the piston cover and extending to the bottom of the piston cover. The expansion ring is disposed inside the infusion cylinder. The feedback tube is distributed in a ring at equal intervals, with one end communicating with the outside of the expansion ring and the other end penetrating the infusion cylinder and communicating with the inside of the manifold.
[0014] Furthermore, the expansion ring is made of nitrile rubber and is bonded to the inner wall of the infusion cylinder.
[0015] Furthermore, the locking mechanism includes a transmission rod, a floating block, a drive spring, and a locking tongue; the transmission rod is U-shaped and is evenly distributed in a ring on the upper surface of the piston cover; the floating block is fixedly installed at the end of the transmission rod; the locking tongue is connected to the outer wall of the floating block near the interface flange via the drive spring, and when the piston cover blocks the connecting cavity, the locking tongue is ejected by the drive spring and locked onto the lower wall of the interface flange.
[0016] Furthermore, a telescopic assembly is provided between the floating block and the locking tongue, with one end of the telescopic assembly connected to the floating block and the other end connected to the locking tongue. Attached Figure Description
[0017] Figure 1 This is a cross-sectional view of a superconducting magnet helium replenishment device according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the infusion cylinder in a superconducting magnet helium replenishment device according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the flow guiding mechanism in a superconducting magnet helium replenishment device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the locking mechanism in the locked state in a superconducting magnet helium replenishment device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the helium flow direction in a superconducting magnet helium replenishment device according to an embodiment of the present invention; Figure 6 This is a first-view structural schematic diagram of a superconducting magnet helium replenishment device according to an embodiment of the present invention; Figure 7 This is a second-view structural schematic diagram of a superconducting magnet helium replenishment device according to an embodiment of the present invention.
[0018] Explanation of reference numerals in the attached figures: 1. Interface flange; 11. Enclosed cavity; 12. Connecting cavity; 13. Piston cover plate; 14. Infusion cylinder; 15. One-way valve; 16. Through hole; 17. Sealing ring; 2. Flow guiding mechanism; 21. Ring plate; 22. Slide cylinder; 23. Fixed cylinder; 24. First slot; 25. Second slot; 3. Reset assembly; 31. Reset rod; 32. Reset plate; 33. Reset spring; 4. Sealing ring; 5. Cooling assembly; 51. Cold head; 52. Cooling ring; 53. Cooling column; 6. Feedback mechanism; 61. Manifold; 62. Flow guiding pipe; 63. Feedback pipe; 64. Expansion ring; 7. Locking mechanism; 71. Transmission rod; 72. Floating block; 73. Drive spring; 74. Locking tongue. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.
[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0023] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.
[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0025] See Figures 1-7 An embodiment of the present invention provides a superconducting magnet helium replenishment device, comprising: an interface flange 1, wherein the interface flange 1 has a closed cavity 11 in the upper part and a connecting cavity 12 in the lower part, the closed cavity 11 and the connecting cavity 12 are connected, and the inner diameter of the closed cavity 11 is larger than the inner diameter of the connecting cavity 12; a piston cover plate 13, slidably connected to the closed cavity 11, wherein an infusion cylinder 14 is fixedly fixed through the middle position of the piston cover plate 13, and a through hole 16 is opened on the outer side of the infusion cylinder 14 near the bottom, and the top of the infusion cylinder 14 is provided with... The system includes a one-way valve 15; a flow guiding mechanism 2, located within the connecting cavity 12, used to block the connecting cavity 12 under normal conditions, and to keep the through hole 16 connected to the connecting cavity 12 when the piston cover plate 13 moves down to block the top of the connecting cavity 12; a feedback mechanism 6, located above the piston cover plate 13, used to adaptively control the flow rate of liquid helium during delivery based on pressure changes inside the interface flange 1; and a locking mechanism 7, located outside the interface flange 1, used to lock the position of the piston cover plate 13 when it moves down to the position of blocking the connecting cavity 12.
[0026] In this embodiment, addressing the problems of frosting at the infusion port, difficult connection, pressure imbalance requiring manual adjustment, and high operational risks during existing helium replenishment processes, the interface flange 1 serves as the connection base between the device and the superconducting magnet. Internally, it is divided into a closed cavity 11 and a connecting cavity 12, with the closed cavity 11 having a larger inner diameter to provide sliding space for the piston cover plate 13. The piston cover plate 13 can slide up and down along the closed cavity 11. The infusion cylinder 14, fixed at its center, serves as the liquid helium delivery channel. A one-way valve 15 at the top prevents backflow of liquid helium, and a through hole 16 at the bottom is used for liquid helium diversion. The flow guiding mechanism 2 normally seals the connecting cavity 12 to prevent internal helium leakage. Before helium replenishment, the external helium replenishment tube is connected to the top of the infusion cylinder 14. After connection, the piston cover plate 13 is pressed downwards until it seals the top of the connecting cavity 12. At this point, the locking mechanism 7 locks the position of the piston cover plate 13. Simultaneously, under the action of the flow guiding mechanism 2, the through hole 16 on the outside of the infusion cylinder 14 is opened. 6 and the connecting cavity 12 are kept in a connected state. At this time, the one-way valve 15 can be opened to perform the infusion operation. When the helium replenishment tube head releases liquid helium, a large amount of liquid helium rushes into the infusion cylinder 14. The liquid helium flowing into the infusion cylinder 14 will be discharged through the through hole 16 and overflow into the interface flange 1 with the help of the flow guiding mechanism 2, and rush into the part of the magnet body that needs to be soaked in liquid helium. A large amount of liquid helium will continuously boil and evaporate during the infusion process, generating a large amount of helium gas inside the interface flange 1, which will increase the internal pressure of the interface flange 1. At this time, the feedback mechanism 6 can adaptively control the flow rate of liquid nitrogen infusion according to the internal pressure of the interface flange 1, which greatly reduces the high intensity of human support during the infusion process and improves the safety of the infusion process. Moreover, this helium guiding method directly eliminates the need to manually open the infusion tube opening, which would cause the internal helium gas to rush out and make it difficult to connect the helium replenishment tube head. At the same time, it avoids the situation of ice forming at the infusion tube opening, which greatly improves the convenience and safety of helium tube connection during infusion work.
[0027] Optional, please refer to Figure 1 and Figure 3 The flow guiding mechanism 2 includes an annular plate 21, a fixed cylinder 23, a sliding cylinder 22, and a reset assembly 3. The annular plate 21 is fixedly installed on the inner wall of the connecting cavity 12. The infusion cylinder 14 passes through the annular plate 21. The fixed cylinder 23 is fixedly installed on the lower surface of the annular plate 21. The sliding cylinder 22 is slidably disposed inside the fixed cylinder 23, and the bottom end of the infusion cylinder 14 is in contact with the bottom inner wall of the sliding cylinder 22. The outer side of the sliding cylinder 22 is provided with a first drainage groove that is evenly spaced and arranged in a ring. The outer side of the fixed cylinder 23 is provided with a second drainage groove that is evenly spaced and arranged in a ring. When the piston cover plate 13 blocks the connecting cavity 12, the first drainage groove and the second drainage groove are aligned. The reset assembly 3 is disposed at the bottom of the sliding cylinder 22 and is used to drive the sliding cylinder 22 to move upward and reset synchronously when the infusion cylinder 14 moves upward. A sealing assembly 4 is provided between the sliding cylinder 22 and the fixed cylinder 23 to maintain a seal.
[0028] In this embodiment, the flow guiding mechanism 2 consists of an annular plate 21, a fixed cylinder 23, a sliding cylinder 22, and a reset assembly 3. The annular plate 21 is fixed to the inner wall of the connecting cavity 12, serving as a support and positioning element. The fixed cylinder 23 and the sliding cylinder 22 are slidably engaged. Under normal conditions, the reset assembly 3 pulls the sliding cylinder 22 upward, causing the first drain groove and the second drain groove to misalign, thus sealing the connecting cavity 12. When the piston cover plate 13 is pressed downward, the infusion cylinder 14 will drive the sliding cylinder 22 downward together until the piston cover plate 13 seals the connecting cavity 12. At this time, the outer side of the sliding cylinder 22... When the first leakage channel is aligned with the second leakage channel on the outside of the fixed cylinder 23, the one-way valve 15 is opened to supply liquid nitrogen. Liquid nitrogen will then enter the slide cylinder 22 through the through hole 16, and then flow along the first and second leakage channels into the connecting cavity 12, and into the part of the magnet body that needs to be soaked in liquid helium. When the liquid injection is completed and the liquid delivery cylinder 14 is moved upward, the reset component 3 can drive the slide cylinder 22 to move upward and reset, so that the first and second leakage channels are misaligned again, and the connecting cavity 12 is restored to the blocked state to avoid helium leakage.
[0029] Optional, please refer to Figure 3 The reset assembly 3 includes a reset rod 31, a reset plate 32, and a reset spring 33. The reset rod 31 is fixedly installed at the bottom of the slide cylinder 22, the reset plate 32 is fixedly installed at the bottom end of the reset rod 31, one end of the reset spring 33 is fixedly connected to the upper surface of the reset plate 32, and the other end is fixedly connected to the lower surface of the ring plate 21.
[0030] In this embodiment, the reset rod 31 is fixed to the bottom of the slide cylinder 22 by argon arc welding, and the reset plate 32 is fixed to the bottom end of the reset rod 31 by bolts. When the slide cylinder 22 moves down, the reset rod 31 drives the reset plate 32 to move down synchronously, and the reset spring 33 stretches and stores elastic potential energy. After the helium is replenished, when the infusion cylinder 14 moves up, the slide cylinder 22 can be automatically reset and moved up under the action of the reset spring 33, making it more convenient to use.
[0031] Optional, please refer to Figure 3 The sealing assembly includes a sealing ring 4. The inner wall of the fixed cylinder 23 has an annular groove, the sealing ring 4 is disposed in the annular groove, and the inner wall of the sealing ring 4 is in contact with the outer wall of the sliding cylinder 22.
[0032] In this embodiment, an annular groove with a width of 4 mm and a depth of 3 mm is machined on the inner wall of the fixed cylinder 23. The fluororubber sealing ring 4 is embedded in the annular groove to ensure that the inner wall of the sealing ring 4 is tightly fitted with the outer wall of the slide cylinder 22. The sealing ring 4 fills the gap between the slide cylinder 22 and the fixed cylinder 23. By utilizing the elastic deformation of fluororubber, dynamic sealing is achieved to prevent helium from leaking from the gap. The sealing ring 4 has excellent low-temperature resistance and maintains elasticity even at -200℃, which greatly improves the sealing effect.
[0033] Optional, please refer to Figure 1 and Figure 2 A sealing ring 17 is fixedly installed on the lower surface of the piston cover plate 13, and when the piston cover plate 13 moves down to the top of the sealing cavity 12, the sealing ring 17 fits against the bottom inner wall of the closed cavity 11.
[0034] In this embodiment, when the piston cover plate 13 moves down to the sealing position, the sealing ring 17 fits tightly against the inner wall of the bottom of the sealed cavity 11 to form an annular sealing strip, preventing helium from leaking from the gap between the piston cover plate 13 and the sealed cavity 11.
[0035] Optional, please refer to Figure 1 and Figure 6 It also includes a cooling assembly 5 for cooling the helium gas inside the interface flange 1. The cooling assembly 5 includes a cold head 51, a cooling ring 52 and a cooling guide column 53. The cold head 51 is disposed on the outside of the interface flange 1. The cooling ring 52 is sleeved on the outside of the fixed cylinder 23 and located in the connecting cavity 12. One end of the cooling guide column 53 is fixedly connected to the cold head 51 and the other end is fixedly connected to the cooling ring 52.
[0036] In this embodiment, the low-temperature cooling energy generated by the cold head 51 is transferred to the cooling ring 52 through the cooling column 53. The cooling ring 52 condenses the helium in the connecting cavity 12, converting the helium into liquid helium, reducing the total amount of helium, and thus reducing the internal pressure.
[0037] Optional, please refer to Figure 2 and Figure 5 The feedback mechanism 6 includes a manifold 61, a guide tube 62, a feedback tube 63, and an expansion ring 64. The manifold 61 is sleeved on the outside of the infusion cylinder 14 and is located above the piston cover plate 13. The guide tube 62 is distributed in a ring at equal intervals, with one end communicating with the outside of the manifold 61 and the other end penetrating the piston cover plate 13 and extending to the bottom of the piston cover plate 13. The expansion ring 64 is disposed inside the infusion cylinder 14. The feedback tube 63 is distributed in a ring at equal intervals, with one end communicating with the outside of the expansion ring 64 and the other end penetrating the infusion cylinder 14 and communicating with the inside of the manifold 61.
[0038] In this embodiment, the manifold 61 is fixed to the outside of the infusion cylinder 14 by a clamp. One end of the guide pipe 62 is welded to the manifold 61, and the other end passes through the piston cover plate 13 and extends 5mm. One end of the feedback pipe 63 is connected to the expansion ring 64, and the other end passes through the infusion cylinder 14 and is connected to the manifold 61. A large amount of liquid helium will continuously boil and evaporate during the inflow process, generating a large amount of helium gas inside the interface flange 1. The helium gas first enters the slide cylinder 22 through the first and second venting channels, and then enters below the piston cover plate 13 through the gap between the ring plate 21 and the infusion cylinder 14. It then enters the manifold 61 through multiple guide pipes 62 on the piston cover plate 13. The gas inside the manifold 61 then enters the expansion ring 64 through the feedback pipe 63, thereby allowing the gas inside the expansion ring 64 to pass through. When helium is filled, if the liquid helium flow rate into the interface flange 1 of the infusion cylinder 14 is too high, the pressure generated by the helium also increases, which causes the expansion ring 64 to expand. This narrows the flow path inside the infusion cylinder 14, thereby reducing the flow rate. At the same time, the cooling component 5 continuously condenses the upper layer of helium gas at low temperature, causing the helium gas to condense back into liquid helium. This continuously reduces the pressure inside the interface flange 1. As the helium gradually decreases, the helium inside the expansion ring 64 is also reduced, causing the expansion ring 64 to shrink. This increases the liquid helium injection flow rate, effectively achieving adaptive feedback adjustment of the liquid helium introduction rate. This significantly reduces the need for high-intensity manual support during infusion, while improving the safety of the infusion process and resulting in better performance.
[0039] Optionally, the expansion ring 64 is made of nitrile rubber and is bonded to the inner wall of the infusion cylinder 14.
[0040] In this embodiment, the expansion ring 64 is made of nitrile rubber (tensile strength ≥15MPa), with a thickness of 6mm and a natural inner diameter of 30mm. It is bonded to the inner wall of the infusion cylinder 14 with special adhesive. The expansion ring 64 utilizes the high elasticity of nitrile rubber to expand and contract under helium pressure, dynamically adjusting the internal flow cross-sectional area of the infusion cylinder 14 to achieve flow rate regulation.
[0041] Optional, please refer to Figure 4 The locking mechanism 7 includes a transmission rod 71, a floating block 72, a drive spring 73, and a locking tongue 74. The transmission rod 71 is U-shaped and is evenly distributed in a ring on the upper surface of the piston cover plate 13. The floating block 72 is fixedly installed at the end of the transmission rod 71. The locking tongue 74 is connected to the outer wall of the floating block 72 near the interface flange 1 by the drive spring 73. When the piston cover plate 13 blocks the connecting cavity 12, the locking tongue 74 is ejected by the drive spring 73 and locked onto the lower wall of the interface flange 1.
[0042] In this embodiment, the transmission rod 71 is welded to the upper surface of the piston cover plate 13, and the floating block 72 is welded to the end of the transmission rod 71. The locking tongue 74 is connected to the floating block 72 through the drive spring 73. The drive spring 73 is pre-compressed by 5mm to ensure that the locking tongue 74 has a tendency to pop out under normal conditions. When the piston cover plate 13 moves down, the transmission rod 71 drives the floating block 72 and the locking tongue 74 to move down synchronously. When the blocking position is reached, the locking tongue 74 is released from the constraint of the side wall of the interface flange 1, and the drive spring 73 pops out the locking tongue 74 and locks it into the lower wall of the interface flange 1. When unlocking, pressing the locking tongue 74 compresses the spring, and the piston cover plate 13 can be moved up.
[0043] Among them, the locking mechanism 7 has a locking force of ≥50N, and the piston cover plate 13 has no loosening or displacement during the helium replenishment process (displacement amount ≤0.1mm); the locking operation only takes 1 second, which is 90% more efficient than the traditional bolt locking method.
[0044] Optionally, a telescopic assembly is provided between the floating block 72 and the locking tongue 74, with one end of the telescopic assembly connected to the floating block 72 and the other end connected to the locking tongue 74.
[0045] In this embodiment, the telescopic kit consists of a guide cylinder and a guide sleeve. The guide cylinder is connected to the floating block 72, and the guide sleeve is connected to the locking tongue 74. This provides precise guidance for the reciprocating motion of the locking tongue 74, preventing the locking tongue 74 from shifting due to the deformation of the drive spring 73. When the piston cover plate 13 moves down, the transmission rod 71 drives the floating block 72 to move down synchronously. Under the pressure of the side wall of the interface flange 1, the locking tongue 74 compresses the drive spring 73 along the direction of the guide cylinder. At this time, the guide sleeve and the guide cylinder slide together to ensure that the locking tongue 74 moves only axially without radial offset. When the piston cover plate 13 reaches the sealing position, the locking tongue 74 is released from the constraint of the flange side wall, the drive spring 73 resets, and pushes the locking tongue 74 out along the guide cylinder, locking it against the lower wall of the interface flange 1. After helium replenishment is completed, pressing the locking tongue 74 causes the locking tongue 74 to compress the spring along the guide cylinder again, thus unlocking. Throughout the process, the telescopic kit always restricts the movement trajectory of the locking tongue 74, resulting in better performance.
[0046] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.
Claims
1. A superconducting magnet helium replenishment device, characterized in that, include: An interface flange (1) is provided with a closed cavity (11) in the upper part and a connecting cavity (12) in the lower part inside the interface flange (1). The closed cavity (11) and the connecting cavity (12) are connected, and the inner diameter of the closed cavity (11) is larger than the inner diameter of the connecting cavity (12). A piston cover plate (13) is slidably connected to the closed cavity (11). An infusion cylinder (14) is fixed through the middle position of the piston cover plate (13). A through hole (16) is opened on the outside of the infusion cylinder (14) near the bottom. A one-way valve (15) is provided at the top of the infusion cylinder (14). The flow guiding mechanism (2) is located in the connecting cavity (12) and is used to block the connecting cavity (12) under normal conditions. When the piston cover plate (13) moves down to block the top of the connecting cavity (12), the through hole (16) is kept connected to the connecting cavity (12). Feedback mechanism (6) is located above the piston cover plate (13) and is used to adaptively control the flow rate of liquid helium during delivery based on the pressure change inside the interface flange (1). The locking mechanism (7) is located on the outside of the interface flange (1) and is used to lock the position of the piston cover plate (13) when the piston cover plate (13) moves down to the position of blocking the connecting cavity (12).
2. The superconducting magnet helium replenishment device according to claim 1, characterized in that, The flow guiding mechanism (2) includes an annular plate (21), a fixed cylinder (23), a sliding cylinder (22), and a reset assembly (3). The annular plate (21) is fixedly installed on the inner wall of the connecting cavity (12). The infusion cylinder (14) passes through the annular plate (21). The fixed cylinder (23) is fixedly installed on the lower surface of the annular plate (21). The sliding cylinder (22) is slidably disposed inside the fixed cylinder (23), and the bottom end of the infusion cylinder (14) is in contact with the bottom inner wall of the sliding cylinder (22). The outer side of the sliding cylinder (22) has equidistant openings. A first drain groove (24) is arranged in a ring shape, and a second drain groove (25) is arranged in a ring shape at equal intervals on the outside of the fixed cylinder (23). When the piston cover plate (13) blocks the connecting cavity (12), the first drain groove (24) and the second drain groove (25) are aligned. The reset component (3) is located at the bottom of the slide cylinder (22) and is used to drive the slide cylinder (22) to move upward synchronously and reset when the infusion cylinder (14) moves upward. A sealing component is provided between the slide cylinder (22) and the fixed cylinder (23) to maintain the seal.
3. The superconducting magnet helium replenishment device according to claim 2, characterized in that, The reset assembly (3) includes a reset rod (31), a reset plate (32) and a reset spring (33). The reset rod (31) is fixedly installed at the bottom of the slide cylinder (22). The reset plate (32) is fixedly installed at the bottom end of the reset rod (31). One end of the reset spring (33) is fixedly connected to the upper surface of the reset plate (32), and the other end is fixedly connected to the lower surface of the ring plate (21).
4. The superconducting magnet helium replenishment device according to claim 2, characterized in that, The sealing assembly includes a sealing ring (4), and the inner wall of the fixed cylinder (23) is provided with an annular groove. The sealing ring (4) is disposed in the annular groove, and the inner wall of the sealing ring (4) is in contact with the outer wall of the sliding cylinder (22).
5. The superconducting magnet helium replenishment device according to claim 1, characterized in that, A sealing ring (17) is fixedly installed on the lower surface of the piston cover plate (13), and when the piston cover plate (13) moves down to the top of the sealing cavity (12), the sealing ring (17) fits against the bottom inner wall of the closed cavity (11).
6. The superconducting magnet helium replenishment device according to claim 2, characterized in that, It also includes a cooling assembly (5) for cooling the helium inside the interface flange (1). The cooling assembly (5) includes a cold head (51), a cooling ring (52) and a cooling column (53). The cold head (51) is located on the outside of the interface flange (1). The cooling ring (52) is sleeved on the outside of the fixed cylinder (23) and located in the connecting cavity (12). One end of the cooling column (53) is fixedly connected to the cold head (51) and the other end is fixedly connected to the cooling ring (52).
7. The superconducting magnet helium replenishment device according to claim 6, characterized in that, The feedback mechanism (6) includes a manifold (61), a guide tube (62), a feedback tube (63), and an expansion ring (64). The manifold (61) is sleeved on the outside of the infusion cylinder (14) and located above the piston cover plate (13). The guide tube (62) is distributed in a ring at equal intervals, with one end connected to the outside of the manifold (61) and the other end penetrating the piston cover plate (13) and extending to the bottom of the piston cover plate (13). The expansion ring (64) is located inside the infusion cylinder (14). The feedback tube (63) is distributed in a ring at equal intervals, with one end connected to the outside of the expansion ring (64) and the other end penetrating the infusion cylinder (14) and communicating with the inside of the manifold (61).
8. The superconducting magnet helium replenishment device according to claim 7, characterized in that, The expansion ring (64) is made of nitrile rubber and is bonded to the inner wall of the infusion cylinder (14).
9. The superconducting magnet helium replenishment device according to claim 1, characterized in that, The locking mechanism (7) includes a transmission rod (71), a floating block (72), a drive spring (73), and a locking tongue (74). The transmission rod (71) is U-shaped and is evenly distributed in a ring on the upper surface of the piston cover plate (13). The floating block (72) is fixedly installed at the end of the transmission rod (71). The locking tongue (74) is connected to the outer wall of the floating block (72) near the interface flange (1) by the drive spring (73). When the piston cover plate (13) blocks the connecting cavity (12), the locking tongue (74) is ejected by the drive spring (73) and locked onto the lower wall of the interface flange (1).
10. A superconducting magnet helium replenishment device according to claim 9, characterized in that, A telescopic assembly is provided between the floating block (72) and the locking tongue (74), with one end of the telescopic assembly connected to the floating block (72) and the other end connected to the locking tongue (74).