Dual-channel liquid cooling rapid switching system with self-locking mechanism
The valve core is locked through the mechanical structure of the self-locking switching assembly, which solves the problems of channel error switching and medium leakage in the prior art, and achieves stable and fast switching and sealing of the dual-channel liquid cooling system.
Patent Information
- Application Number
- CN202510919322.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-04
- Publication Date
- 2025-08-15
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing dual-channel liquid-cooled pipeline system can easily lead to missed channel switching under electromagnetic lock failure or fluid pressure fluctuations, and lacks rigid mechanical self-locking design.
Self-locking switching components are adopted, including locking collars, stop columns, extrusion springs and locking rods, to achieve rigid locking of the valve core through mechanical structures, and to prevent medium leakage through the sealing structure of the anti-seepage ring and the sealing ring.
It realizes stable switching and sealing of channels under fluid pulsation or equipment vibration conditions, avoiding mis-channel switching and medium leakage.
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Figure CN120487957A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of liquid cooling pipes, and more specifically, to a dual-channel liquid cooling fast switching system with a self-locking mechanism. Background Art
[0002] Dual-channel liquid cooling tubes are a technical design that achieves efficient heat dissipation through two independent liquid circulation channels. They are widely used in data centers, industrial equipment, new energy vehicles, energy storage systems, and other fields. The core principle is to use a dual-circuit structure to optimize the coolant flow path, improve heat dissipation efficiency, and reduce energy consumption. After searching, the existing publication number is: CN118066474A, which discloses a dual-channel liquid helium infusion tube; it includes a vacuum outer tube, and the two ends of the vacuum outer tube are respectively provided with an infusion interface, and also includes a liquid helium delivery pipe and a helium return pipe arranged in the vacuum outer tube, the liquid helium delivery pipe is used to transport liquid helium, and the gas vaporized by the liquid helium after passing through the testing device forms helium, and the helium return pipe is used to transport the helium. The helium return pipe is arranged in parallel with a section of the liquid helium delivery pipe and is coupled and connected by a cooling connector. An insulating support structure is provided between the liquid helium delivery pipe, the helium return pipe and the vacuum outer tube. The liquid helium delivery pipe is cooled by the low-temperature return gas of the liquid helium, thereby improving the utilization rate of the liquid helium. At the same time, the liquid helium delivery pipe is pre-cooled by the cooling connector, thereby reducing the loss caused by heat leakage of the liquid helium during the transportation process and improving the utilization rate of the liquid helium. In the process of realizing this application, the inventor found that the existing technology has the following problems: Most of the existing dual-pipe conveying systems use electric locking or a single bayonet structure, which lacks rigid mechanical Mechanical self-locking design; Among them, the electric lock relies on the electromagnetic lock to maintain the valve core position. Once the system power is cut off or the electromagnetic component fails, the locking state will fail; the pin structure uses a simple spring pin. In the case of fluid pressure fluctuations or vibration, the pin is easy to slip out of the slot, resulting in incorrect channel switching;.
[0003] Therefore, to address the above problems, a dual-channel liquid cooling fast switching system with a self-locking mechanism is proposed. Summary of the Invention
[0004] In order to overcome the above-mentioned defects of the prior art, the present application provides a dual-channel liquid-cooled fast switching system with a self-locking mechanism to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a dual-channel liquid-cooled rapid switching system with a self-locking mechanism, comprising a main pipe body and a self-locking switching assembly, wherein the main pipe body comprises a main pipe body and a diversion pipe, and one end of the main pipe body is connected to two groups of diversion pipes through a flange, and the two groups of diversion pipes are symmetrically placed along the main pipe body, and the outer diameter surfaces of the tube bodies of the two groups of diversion pipes are installed with self-locking switching assemblies, the outer diameter surface of the main pipe body is installed with a main valve body, and the self-locking switching assembly includes a self-locking assembly.
[0006] Preferably, the self-locking switching assembly includes a mounting ring, a self-locking assembly and a ball valve. The ball valve is mounted on the top of the mounting ring via bolts, and the self-locking assembly is mounted on the side of the mounting ring via bolts.
[0007] Preferably, the self-locking assembly includes a locking collar, a mounting block, a rotating handle and a second rotating rod. A mounting block is provided above the locking collar, the top end of the mounting block is rotatably connected to the second rotating rod, and the top end of the second rotating rod is mounted with a rotating handle via a bolt.
[0008] Preferably, the locking collar includes a first fixing groove, a contraction groove and a second fixing groove, a contraction groove is provided on the side of the first fixing groove, a second fixing groove is provided on the side of the contraction groove away from the first fixing groove, and the grooves of the first fixing groove, the contraction groove and the second fixing groove are provided along the outer diameter surface of the locking collar.
[0009] Preferably, the self-locking assembly also includes a first rotating shaft, a limiting ring, a connecting cover and a second rotating shaft. The first rotating shaft is located at the bottom end of the mounting block and is installed with a limiting ring. A connecting cover is installed between the mounting block and the locking collar. One end of the first rotating shaft passes through the limiting ring and is connected to the second rotating shaft, and the first rotating shaft and the second rotating shaft are fixedly connected by a card slot.
[0010] Preferably, the self-locking assembly further includes a fixed block, a stop column, an extrusion spring and a locking rod. An extrusion spring is placed above the fixed block, a stop column is provided on one side of the first fixed groove of the fixed block, and a locking rod is installed at the bottom end of the fixed block. When the stop column is driven by the second rotating shaft and rotates axially, the stop column will slide along the first fixed groove, the contraction groove and the second fixed groove.
[0011] Preferably, the self-locking assembly further includes a sealing cavity, an anti-seepage ring, a convex ring, a sealing ring and a sealing groove. The locking collar is located directly below the fixed block and a sealing cavity is reserved therein. The sealing ring is arranged directly below the locking collar. The anti-seepage ring is located at the inner wall of the sealing ring. A sealing groove is arranged on the inner wall of the sealing ring. A convex ring is arranged on the outer diameter surface of the anti-seepage ring. The anti-seepage ring and the sealing ring are sealed via the convex ring and the sealing groove.
[0012] Preferably, a first flange is installed on one end of the main body away from the diverter pipe, and a second flange is installed on one end of the diverter pipe away from the main body.
[0013] Preferably, a driving motor is provided at the top of the ball valve, the output shaft of the driving motor passes through the mounting base, the output shaft of the driving motor is connected to a first rotating rod, a valve core is installed at the bottom end of the first rotating rod, and the valve core is provided with a plug-in slot on one side of the locking assembly.
[0014] Preferably, the two groups of diversion tubes have the same diameter, and the diameter of the main body is larger than the diameter of the diversion tubes.
[0015] The technical effects and advantages of this application are: Compared with the prior art, this is a dual-channel liquid-cooled rapid switching system with a self-locking mechanism, and the first fixed groove, the contraction groove and the second fixed groove provided on the locking collar of the self-locking switching assembly can cooperate with each other to form a positioning track for the stop column, wherein the rotating handle drives the stop column to move along the groove through the second rotating rod and the first rotating shaft. When the stop column reaches the first fixed groove or the second fixed groove, the extrusion spring pushes the locking rod to insert into the plug-in groove of the valve core, forming a rigid mechanical lock. By utilizing the mechanical coupling between the parts, the locking rod always maintains axial pressure on the valve core. Even in the face of fluid pulsation or equipment vibration, the limit structure of the double fixed groove can prevent the stop column from shifting.
[0016] Compared with the existing technology, this dual-channel liquid-cooled rapid switching system with a self-locking mechanism, in which the sealing groove on the inner wall of the sealing ring and the convex ring on the outer diameter of the waterproof ring cooperate with each other to form a first physical barrier, blocking fluid penetration through the sealed cavity between the two. When the liquid-cooling medium flows through the diversion pipe, the waterproof ring is squeezed and deformed by the fluid pressure, thereby enhancing the fit between the convex ring and the sealing groove. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic structural diagram of the shunt pipe of the present application; Figure 3 This is a schematic structural diagram of the lock assembly of this application; Figure 4 This is a schematic diagram of a three-dimensional cross-sectional structure of the lock assembly of the present application; Figure 5 This is a front view structural diagram of the self-locking switching assembly of the present application; Figure 6 This is a schematic structural diagram of the main valve body of this application.
[0018] The accompanying drawings are marked as follows: 1. main pipe body; 2. self-locking switching assembly; 3. main valve body; 4. main pipe body; 5. first flange; 6. diverter pipe; 7. mounting ring; 8. self-locking assembly; 9. ball valve; 901. drive motor; 902. mounting base; 903. first rotating rod; 904. valve core; 905. plug-in slot; 10. second flange; 11. locking collar; 12. first fixed groove; 13. contraction groove; 14. second fixed groove; 15. fixing block; 16. stop column; 17. mounting block; 18. rotating handle; 19. second rotating rod; 20. first rotating shaft; 21. limiting ring; 22. connecting cover; 23. second rotating shaft; 24. extrusion spring; 25. locking rod; 26. sealing cavity; 27. anti-seepage ring; 2701. convex ring; 28. blocking ring; 2801. sealing groove. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application. Example
[0020] As attached Figures 1 to 6 The shown system is a dual-channel liquid-cooled rapid switching system with a self-locking mechanism, comprising a main pipe body 1 and a self-locking switching assembly 2. The main pipe body 1 includes a main pipe body 4 and a diversion pipe 6. One end of the main pipe body 4 is connected to two groups of diversion pipes 6 through a flange. The two groups of diversion pipes 6 are symmetrically placed along the main pipe body 4. The self-locking switching assembly 2 is installed on the outer diameter surface of the pipe body of the two groups of diversion pipes 6. The outer diameter surface of the main pipe body 4 is installed with a main valve body 3. The self-locking switching assembly 2 includes a self-locking assembly 8.
[0021] Among them, the dual-channel liquid-cooled rapid switching system with a self-locking mechanism is composed of a main pipe body 1 and a self-locking switching component 2. The main pipe body 1 forms a liquid-cooled transmission channel through the main pipe body 4 and the symmetrical diversion pipe 6. The main valve body 3 controls the total flow, and the flange realizes the equipment connection. Then the ball valve 9 in the self-locking switching component 2 is driven by the driving motor 901 to drive the valve core 904 to open and close, and the self-locking component 8 drives the blocking column 16 to move along the fixed groove and the contraction groove 13 of the locking ring 11 by rotating the handle 18, and cooperates with the extrusion spring 24 to make the locking rod 25 inserted into the valve core 904 plug-in groove 905 to realize mechanical self-locking. At the same time, the sealing structure of the anti-seepage ring 27 and the sealing ring 28 prevents medium leakage and locks the valve core 904, so that the parts work together to realize dual-channel rapid switching and self-locking. Example
[0022] Based on Example 1, the solution in Example 1 is further detailed in combination with the following specific working methods. Figures 1 to 6 As shown, see the following description for details: As a preferred embodiment, the self-locking switching component 2 includes a mounting ring 7, a self-locking component 8 and a ball valve 9. The mounting ring 7 is detachably mounted by bolt connection to ensure the stability of the component position. The top of the mounting ring 7 is installed with a ball valve 9 by bolts, wherein the ball valve 9 cooperates with the self-locking component 8 to control the on-off and flow direction switching of the fluid in the diversion pipe 6, and is the core executive component of the dual-channel switching. The side of the mounting ring 7 is installed with a self-locking component 8 by bolts.
[0023] As a preferred embodiment, the self-locking assembly 8 includes a locking collar 11, a mounting block 17, a rotating handle 18 and a second rotating rod 19, wherein the locking collar 11 provides a moving track for the blocking column 16, and realizes the switching and fixing of the locking position through the internal groove structure. A mounting block 17 is provided above the locking collar 11, and the top end of the mounting block 17 is rotatably connected to the second rotating rod 19, and the top end of the second rotating rod 19 is installed with a rotating handle 18 by a bolt.
[0024] As a preferred embodiment, the locking collar 11 includes a first fixed groove 12, a contraction groove 13 and a second fixed groove 14, wherein the first fixed groove 12 and the contraction groove 13 correspond to the two sealing directions of the ball valve 9 respectively. At this time, during the rotation process, whether the blocking column 16 is in the first fixed groove 12 or the second fixed groove 14, the valve core 904 is locked, and only the blocking column 16 is in the contraction groove 13. At this time, the blocking column 16 moves in the transition area, allowing the valve core 904 to rotate during the switching process, which is used to fix the blocking column 16 to prevent the valve core 904 from malfunctioning. The contraction groove 13 is provided on the side of the first fixed groove 12, and the second fixed groove 14 is provided on the side of the contraction groove 13 away from the first fixed groove 12. The grooves of the first fixed groove 12, the contraction groove 13 and the second fixed groove 14 are arranged through the outer diameter surface of the locking collar 11.
[0025] As a preferred embodiment, the self-locking assembly 8 also includes a first rotating shaft 20, a limiting ring 21, a connecting cover 22 and a second rotating shaft 23. The first rotating shaft 20 is located at the bottom end of the mounting block 17 and is installed with a limiting ring 21. The limiting ring 21 is installed between the mounting block 17 and the locking ring 11 to limit the axial displacement of the first rotating shaft 20 and ensure smooth rotation. A connecting cover 22 is installed between the mounting block 17 and the locking ring 11, and the connecting cover 22 fixes the connection between the first rotating shaft 20 and the second rotating shaft 23 to prevent the transmission components from falling off. One end of the first rotating shaft 20 passes through the limiting ring 21 and is connected to the second rotating shaft 23, and the first rotating shaft 20 and the second rotating shaft 23 are fixedly connected by a card slot.
[0026] As a preferred embodiment, the self-locking assembly 8 also includes a fixed block 15, a stop column 16, an extrusion spring 24 and a locking rod 25. The fixed block 15 is installed on the locking collar 11, supports the extrusion spring 24 and fixes the moving direction of the stop column 16. The extrusion spring 24 is placed above the fixed block 15, and the extrusion spring 24 provides a reset force. When the stop column 16 moves to the fixed groove, the spring pushes the locking rod 25 to insert into the plug-in groove 905 of the valve core 904 to achieve self-locking. The fixed block 15 is located on one side of the first fixed groove 12 and is provided with a stop column 16, and the stop column 16 is the key. The actuator is driven by the second rotating shaft 23 and slides along the first fixed groove 12, the contraction groove 13 and the second fixed groove 14 of the locking ring 11 to control the position of the locking rod 25. The locking rod 25 is installed at the bottom end of the fixed block 15, and the bottom end of the locking rod 25 is inserted into the valve core 904 insertion groove 905. When the blocking column 16 is located in the fixed groove, the locking rod 25 clamps the valve core 904 to prevent it from rotating due to fluid pressure or vibration. When the blocking column 16 is driven by the second rotating shaft 23 and rotates axially, the blocking column 16 slides along the first fixed groove 12, the contraction groove 13 and the second fixed groove 14.
[0027] As a preferred embodiment, the self-locking assembly 8 further includes a sealing cavity 26, an anti-seepage ring 27, a convex ring 2701, a blocking ring 28 and a sealing groove 2801. The locking collar 11 is located directly below the fixed block 15 and a sealing cavity 26 is reserved. It is located below the locking collar 11 to provide a reset space for the locking rod 25. The blocking ring 28 is arranged directly below the locking collar 11. The anti-seepage ring 27 is located at the inner wall of the blocking ring 28. The inner wall of the blocking ring 28 is provided with a sealing groove 2801. The outer diameter surface of the anti-seepage ring 27 is provided with a convex ring 2701, wherein the anti-seepage ring 27 is installed on the inner wall of the blocking ring 28. The outer diameter convex ring 2701 is interference fit with the sealing groove 2801 to form a sealing cavity 26 to block the fluid leakage path. The anti-seepage ring 27 and the blocking ring 28 are sealed and connected between the convex ring 2701 and the sealing groove 2801. The sealed connection prevents leakage of the liquid cooling medium and ensures the sealing of the system.
[0028] As a preferred embodiment, a first flange 5 is installed at one end of the main body 4 away from the shunt pipe 6 , and a second flange 10 is installed at one end of the shunt pipe 6 away from the main body 4 .
[0029] As a preferred embodiment, a driving motor 901 is provided at the top of the ball valve 9, and the output shaft of the driving motor 901 passes through the mounting base 902. The output shaft of the driving motor 901 is connected to a first rotating rod 903, and a valve core 904 is installed at the bottom end of the first rotating rod 903. When liquid is transported to the main body 4 respectively through two groups of diversion pipes 6, the self-locking switching assembly 2 on the diversion pipe 6 body locks the valve core 904 in the ball valve 9, thereby directly fixing the valve core 904. The valve core 904 is located on one side of the locking assembly and is provided with a plug-in groove 905. During the liquid transportation process, the self-locking assembly 8 locks the valve core 904, thereby directly allowing the valve core 904 to withstand the impact of the liquid without displacement.
[0030] As a preferred embodiment, the diameters of the two groups of diverter tubes 6 are the same, and the diameter of the main body 4 is larger than that of the diverter tube 6 .
[0031] The working process of the present application is as follows: first, the ball valve 9 cooperates with the self-locking assembly 8, which controls the on-off and flow direction switching of the fluid in the shunt pipe 6 and is the core executive component of the dual-channel switching. The locking collar 11 provides a moving track for the blocking column 16, and realizes the switching and fixing of the locking position through the internal groove structure. The first fixed groove 12 and the contraction groove 13 correspond to the two sealing directions of the ball valve 9 respectively. At this time, during the rotation process, whether the blocking column 16 is in the first fixed groove 12 or the second fixed groove 14, the valve core 904 is locked. Only when the blocking column 16 is in the contraction groove 13, the blocking column 16 moves in the transition area, allowing the valve core 904 to rotate during the switching process; The limiting ring 21 is installed between the mounting block 17 and the locking collar 11 to limit the axial displacement of the first rotating shaft 20 and ensure smooth rotation. The connecting cover 22 fixes the connection between the first rotating shaft 20 and the second rotating shaft 23 to prevent the transmission components from falling off. The extrusion spring 24 provides a reset force. When the blocking column 16 moves to the fixed groove, the spring pushes the locking rod 25 to insert into the plug groove 905 of the valve core 904 to achieve self-locking. The blocking column 16 is a key actuator. Driven by the second rotating shaft 23, it slides along the first fixed groove 12, the contraction groove 13 and the second fixed groove 14 of the locking collar 11 to control the position of the locking rod 25. The sealing cavity 26 is located below the locking collar 11 to provide a reset space for the locking rod 25. The anti-seepage ring 27 mounting block 17 is on the inner wall of the blocking ring 28. The outer diameter protrusion 2701 is interference fit with the sealing groove 2801 to form a sealing cavity 26 to block the fluid leakage path. When liquid is transported to the main body 4 respectively through the two groups of shunt pipes 6, the self-locking switching component 2 on the shunt pipe 6 locks the valve core 904 in the ball valve 9, thereby directly fixing the valve core 904. During the liquid transportation process, the self-locking component 8 locks the valve core 904, thereby directly allowing the valve core 904 to withstand the liquid impact without displacement. The above is the working principle of the dual-channel liquid-cooled fast switching system with a self-locking mechanism.
Claims
1. A dual-channel liquid cooling rapid switching system with a self-locking mechanism, comprising a main pipe body (1) and a self-locking switching assembly (2), characterized in that: The main pipe body (1) includes a main pipe body (4) and a diverter pipe (6), one end of the main pipe body (4) is connected to two groups of diverter pipes (6) via a flange, the two groups of diverter pipes (6) are symmetrically placed along the main pipe body (4), the outer diameter surfaces of the two groups of diverter pipes (6) are mounted with self-locking switching components (2), the outer diameter surface of the main pipe body (4) is mounted with a main valve body (3), and the self-locking switching component (2) includes a self-locking component (8).
2. A dual-channel liquid-cooled rapid switching system with a self-locking mechanism according to claim 1, characterized in that: The self-locking switching assembly (2) comprises a mounting ring (7), a self-locking assembly (8) and a ball valve (9), wherein the ball valve (9) is mounted on the top of the mounting ring (7) via bolts, and the self-locking assembly (8) is mounted on the side of the mounting ring (7) via bolts.
3. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 1, characterized in that: The self-locking assembly (8) comprises a locking collar (11), a mounting block (17), a rotating handle (18) and a second rotating rod (19). The mounting block (17) is provided above the locking collar (11). The top end of the mounting block (17) is rotatably connected to the second rotating rod (19). The top end of the second rotating rod (19) is mounted with the rotating handle (18) via a bolt.
4. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 3, characterized in that: The locking collar (11) comprises a first fixing groove (12), a shrinkage groove (13) and a second fixing groove (14); the shrinkage groove (13) is provided on the side of the first fixing groove (12); the second fixing groove (14) is provided on the side of the shrinkage groove (13) away from the first fixing groove (12); the grooves of the first fixing groove (12), the shrinkage groove (13) and the second fixing groove (14) are provided along the outer diameter surface of the locking collar (11).
5. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 3, characterized in that: The self-locking assembly (8) further comprises a first rotating shaft (20), a limiting ring (21), a connecting cover (22) and a second rotating shaft (23), wherein the first rotating shaft (20) is located at the bottom end of the mounting block (17) and is installed with the limiting ring (21), a connecting cover (22) is installed between the mounting block (17) and the locking collar (11), one end of the first rotating shaft (20) passes through the limiting ring (21) and is connected to the second rotating shaft (23), and the first rotating shaft (20) and the second rotating shaft (23) are fixedly connected via a slot.
6. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 3, characterized in that: The self-locking assembly (8) further comprises a fixed block (15), a stop column (16), an extrusion spring (24) and a locking rod (25), wherein the extrusion spring (24) is placed above the fixed block (15), the stop column (16) is provided on one side of the fixed block (15) located at the first fixed groove (12), and the locking rod (25) is installed at the bottom end of the fixed block (15), and when the stop column (16) is driven by the second rotating shaft (23) and rotated in the axial direction, the stop column (16) slides along the first fixed groove (12).
7. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 3, characterized in that: The self-locking assembly (8) further comprises a sealing cavity (26), an anti-seepage ring (27), a convex ring (2701), a blocking ring (28) and a sealing groove (2801); the locking collar (11) is located directly below the fixed block (15) and has a sealing cavity (26) reserved therefor; the blocking ring (28) is arranged directly below the locking collar (11); the anti-seepage ring (27) is located on the inner wall of the blocking ring (28); the inner wall of the blocking ring (28) is provided with a sealing groove (2801); the outer diameter surface of the anti-seepage ring (27) is provided with a convex ring (2701); the anti-seepage ring (27) and the blocking ring (28) are sealedly connected via the convex ring (2701) and the sealing groove (2801).
8. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 1, characterized in that: A first flange (5) is installed at one end of the main body (4) away from the diverter pipe (6), and a second flange (10) is installed at one end of the diverter pipe (6) away from the main body (4).
9. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 2, characterized in that: A driving motor (901) is provided at the top end of the ball valve (9), an output shaft of the driving motor (901) passes through the mounting base (902), the output shaft of the driving motor (901) is connected to a first rotating rod (903), a valve core (904) is installed at the bottom end of the first rotating rod (903), and a plug-in slot (905) is provided on one side of the locking assembly of the valve core (904).
10. The dual-channel liquid cooling rapid switching system with a self-locking mechanism according to claim 1, characterized in that: The two groups of diverter tubes (6) have the same diameter, and the diameter of the main body (4) is larger than the diameter of the diverter tubes (6).
Citation Information
Patent Citations
Double-channel liquid helium infusion tube
CN118066474A