An eddy current diode with an axial flow check component

Abstract

This invention discloses an eddy current diode with an axial flow check component, belonging to the field of molten salt energy storage technology. It includes a vortex disk, an axial tube, a tangential tube, and an axial flow check component. The axial tube is positioned axially on the vortex disk and communicates with its inner cavity. The tangential tube is positioned along the circumferential tangent of the vortex disk and also communicates with its inner cavity. The axial flow check component is coaxially positioned on the outer side of the vortex disk, opposite to the axial tube. When the molten salt medium flows forward along the axial tube, it pushes the axial flow check component to open, allowing fluid to enter through the axial tube cavity and flow out through the tangential tube. When the molten salt medium is cut off and flows back in the reverse direction, the eddy current diode cavity generates high swirling resistance, and simultaneously, the axial flow check component quickly returns to its original position and seals against the axial tube to achieve mechanical cutoff. This invention integrates eddy current unidirectional conduction and forced backflow prevention, combining advantages such as high reverse eddy current resistance, mechanical cutoff, rapid spring reset, and spring-dry cavity isolation.

Description

Technical Field

[0001] This invention belongs to the technical field of molten salt energy storage systems, and specifically relates to an eddy current diode with an axial flow check component. Background Technology

[0002] In molten salt energy storage power plants, a check valve is often installed at the outlet of the cryogenic pump of the CSP to prevent the molten salt from flowing back and causing the pump shaft to seize after the pump stops. Conventional swing or lift check valves have the problem of delayed closing. When the pump stops, the valve disc closes late, and the cryogenic molten salt flows back into the pump chamber. It is easy for it to solidify due to the low temperature, causing the pump shaft to seize and the system to shut down.

[0003] Eddy current diodes are unidirectional flow devices without moving parts. They generate eddies within a cavity using a tangential inlet, exhibiting low resistance in forward flow and high resistance in reverse flow, with a forward-to-reverse flow resistance ratio of 5-10. However, pure eddy current diodes rely solely on flow resistance to suppress backflow, lacking mechanical seals for shut-off. Under prolonged reverse pressure differentials, continuous leakage can still occur, failing to completely block molten salt backflow. Integrating a conventional check valve structure into an eddy current diode would result in the spring being in constant contact with high-temperature molten salt, leading to corrosion, crystallization jamming, and elastic failure, thus reducing service life and reliability. Summary of the Invention

[0004] Technical problem solved: In view of the technical problems existing in the background art, the present invention provides an eddy current diode with an axial flow check component, which realizes the integration of eddy current unidirectional conduction and forced reverse flow prevention, and has the advantages of high reverse resistance of eddy current, mechanical cut-off, rapid spring reset, and spring dry cavity isolation, thus solving the problem of easy reverse backflow when traditional eddy current diodes are applied in high temperature molten salt conditions.

[0005] Technical solution: The eddy current diode with an axial flow check component according to the present invention includes: vortex disk; An axial tube is provided on the axial direction of the vortex and communicates with the inner cavity of the vortex. A tangential tube, wherein the tangential tube is arranged along the circumferential tangential direction of the vortex disk and communicates with the inner cavity of the vortex disk; and An axial flow anti-reverse assembly is provided, which is coaxially aligned with the axial tube and disposed on the outside of the vortex plate, which is different from the axial tube. When the molten salt medium flows forward along the axial pipe, the molten salt medium pushes the axial flow check valve to open, and the fluid enters through the axial pipe cavity and flows out from the tangential pipe. When the molten salt medium is cut off and flows back in the reverse direction, the eddy current diode cavity generates high swirling resistance. At the same time, the axial flow anti-reverse component quickly returns to its original position and seals with the axial tube to achieve mechanical cut-off.

[0006] Preferably, the axial flow anti-reverse assembly includes: The valve tube is coaxially arranged with the axial tube and is located on the side of the scroll opposite to the axial tube. The end of the valve tube is provided with a fixed flange. Valve cover, which is fixedly connected to the fixed flange of the valve pipe; The valve stem passes through the side wall of the vortex, with its inner end extending into the connection between the axial tube and the vortex, and its outer end extending into the valve tube. The valve disc is fixedly installed at the inner end of the valve stem and correspondingly seals the outlet of the axial pipe. A compression spring is located inside the valve tube and is correspondingly fitted onto the valve stem. The compression spring provides a preload force for the valve disc to close.

[0007] Preferably, the axial flow anti-reverse assembly further includes: A first spring seat is disposed at the outer end of the valve stem, and a first limiting post is provided on the outer side of the first spring seat; The second spring seat is located inside the valve cover, and a second limiting post is provided on the side of the second spring seat near the compression spring. The two ends of the compression spring are respectively sleeved on the first limiting post and the second limiting post.

[0008] Preferably, a third limiting post is provided on the side of the second spring seat away from the compression spring; a limiting hole for accommodating the third limiting post is provided on the inner side of the valve cover.

[0009] Preferably, the axial flow anti-reverse assembly further includes an isolation end plate and a sealing bellows; The isolation end plate is disposed at the root of the inner side of the valve tube, and the isolation end plate separates the internal fluid channel of the scroll plate from the spring chamber of the valve tube; The sealing bellows is fitted onto the outside of the valve stem, and its two ends are respectively supported between the isolation end plate and the first spring seat to achieve dynamic sealing of the valve stem.

[0010] Preferably, the inner wall of the vortex disk is provided with a receiving groove for accommodating the valve disc at the location corresponding to the valve pipe.

[0011] Preferably, the vortex is a spiral or disc-shaped cavity structure, the axial tube is connected to the center of the vortex surface, and the tangential tube is tangentially connected to the edge of the vortex.

[0012] Preferably, the valve disc has a conical or spherical structure, forming a line seal or surface seal with the outlet of the axial pipe.

[0013] Preferably, the eddy current diode is used for unidirectional flow control in molten salt energy storage / nuclear power, chemical or hydraulic systems.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects: 1. This invention integrates an axial flow check component into the traditional eddy current diode structure. Forced check is achieved through the cooperation of a valve disc and a compression spring, effectively blocking the backflow of reverse molten salt fluid, solving the problem of easy leakage at low voltage in traditional eddy current diodes, and significantly improving the reliability of unidirectional check. 2. This axial flow check valve assembly uses a combination of a sealing bellows and an isolation end plate for sealing, which isolates the molten salt fluid from contact with the compression spring and valve stem moving parts, avoids corrosion of the molten salt medium and jamming of impurities, extends the service life of the axial flow check valve assembly, and is suitable for high temperature and corrosive fluid conditions. 3. The eddy current diode has a compact structure. The eddy current diode body and the axial flow anti-reverse component are integrated into one design, eliminating the need for additional check valves, reducing pipeline interfaces, lowering the risk of molten salt backflow, and making installation and maintenance convenient. It is suitable for large-scale molten salt energy storage system promotion. 4. This device retains the characteristics of eddy current diodes, which are unpowered and have a fast response. When the fluid flows in the forward direction, it enters the vortex disk through the axial pipe to form a vortex, which automatically conducts along the tangential pipe channel. When the fluid flows in the reverse direction, the vortex effect is superimposed on the dual blocking function of the axial flow check component. The compression spring provides the reset force, the valve core responds quickly, shortens the closing time of the eddy current diode, and has excellent unidirectional conduction performance. It significantly reduces the backflow of molten salt and avoids the backflow of low-temperature molten salt that could seize the pump shaft. The present invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of the eddy current diode of the present invention; Figure 2 for Figure 1 Front view of the eddy current diode structure; Figure 3 for Figure 2 Cross-sectional view of the AA-axis structure of the eddy current diode; Figure 4 for Figure 2 Cross-sectional view of the BB-axis structure of the eddy current diode; Figure 5 for Figure 3 First-view structural schematic diagram of a central axial flow check valve assembly; Figure 6 for Figure 3 First-view structural schematic diagram of a central axial flow check valve assembly; Figure 7 for Figure 3 Cross-sectional view of the central axial flow check valve assembly along the axis.

[0016] Reference numerals: 100, eddy current diode; 1, vortex disk; 2, axial tube; 3, tangential tube; 4, axial flow check valve assembly; 41, valve tube; 42, fixed flange; 43, valve cover; 431, limiting hole; 44, valve stem; 45, valve disc; 46, receiving groove; 47, isolation end plate; 48, sealing bellows; 49, first spring seat; 491, first limiting post; 410, compression spring; 411, second spring seat; 412, second limiting post; 413, third limiting post. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings. Figures 1-7 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0018] like Figures 1-4 As shown, this invention provides an eddy current diode with an axial flow check assembly. The eddy current diode 100 includes a vortex disk 1, an axial tube 2, a tangential tube 3, and an axial flow check assembly 4. The vortex disk 1 has a spiral or disc-shaped cavity structure. The axial tube 2 is correspondingly disposed on the axial direction of the vortex disk 1 and communicates with the inner cavity of the vortex disk 1. The tangential tube 3 is disposed along the circumferential tangent direction of the vortex disk 1 and communicates with the inner cavity of the vortex disk 1. The axial flow check assembly 4 is coaxially disposed on the outer side of the vortex disk 1, opposite to the axial tube 2, corresponding to the axial tube 2. When the molten salt medium flows forward along the axial tube 2, the molten salt medium pushes the valve of the axial flow check assembly 4 to open, and the fluid flows into the cavity of the vortex disk 1 through the axial tube 2 with low resistance and flows out through the tangential tube 3. When the molten salt medium is cut off and flows back in the opposite direction, the cavity of the eddy current diode generates high swirling resistance, and at the same time, the valve of the axial flow check assembly 4 quickly returns to its original position and seals against the axial tube 2 to achieve mechanical cut-off. The axial flow anti-reverse component 4 and the eddy current diode 100 form an integrated structure of "axial tube inlet, tangential tube outlet and axial tube bottom anti-reverse".

[0019] like Figure 3 and Figures 5-7 As shown, the core structure of the axial flow anti-reverse component 4 is as follows: The valve pipe 41 is coaxially arranged with the axial pipe 2 and is located on the side of the scroll plate 1 opposite to the axial pipe 2. The end of the valve pipe 41 is provided with a fixed flange 42. The valve cover 43 is fixedly connected to the fixed flange 42 of the valve pipe 41, so that a dry cavity for the compression spring is formed inside the valve pipe 41.

[0020] The valve stem 44 passes through the side wall of the scroll plate 1, with its inner end extending into the connection between the axial tube 2 and the scroll plate 1. The valve disc 45 is fixedly disposed at the inner end of the valve stem 44 and correspondingly seals the outlet of the axial tube 2. The valve disc 45 can adopt a conical or spherical structure to form a line seal or surface seal with the outlet of the axial tube 2. The outer end of the valve stem 44 extends into the valve tube 41, and the compression spring 410 is located inside the valve tube 41 and correspondingly fitted onto the valve stem 44. The compression spring 410 provides preload force for the valve disc 45 to close.

[0021] In a preferred embodiment, the axial flow check valve assembly 4 further includes an isolation end plate 47, a sealing bellows 48, a first spring seat 49, and a second spring seat 411. The isolation end plate 47 is disposed at the inner root of the valve tube 41, separating the internal fluid passage of the scroll plate 1 from the spring chamber of the valve tube 41. The sealing bellows 48 is fitted onto the outside of the valve stem 44, and its two ends are respectively supported between the isolation end plate 47 and the first spring seat 49 (which can be sealed and fixed by welding), thereby dividing the inner cavity of the valve tube 41 into an upper cavity (connecting to the scroll plate) and a lower cavity (accommodating the compression spring) to achieve dynamic sealing at the movement of the valve stem 44 and prevent fluid leakage into the spring mounting cavity (dry cavity). The first spring seat 49 is located at the outer end of the valve stem 44, and a first limiting post 491 is provided on the outer side of the first spring seat 49. The second spring seat 411 is located on the inner side of the valve cover 43, and a second limiting post 412 is provided on the side of the second spring seat 411 near the compression spring 410. The two ends of the compression spring 410 are respectively sleeved on the first limiting post 491 and the second limiting post 412. The first limiting post 491 and the second limiting post 412 are used to limit the radial displacement of the compression spring and ensure that the force is coaxial. This axial flow check valve assembly adopts a combination of sealing bellows and isolation end plate for sealing, which isolates the molten salt fluid from contact with the compression spring and valve stem moving parts, avoids corrosion of the molten salt medium and impurity jamming, extends the service life of the axial flow check valve assembly, and is suitable for high temperature and corrosive fluid conditions.

[0022] In a preferred embodiment, such as Figure 7 As shown, a third limiting post 413 is also provided on the side of the second spring seat 411 away from the compression spring 410; a limiting hole 431 for accommodating the third limiting post 413 is provided on the inner side of the valve cover 43; this arrangement can improve the connection stability between the second spring seat 411 and the valve cover 43, and the valve cover 43 can meet the maintenance requirements of the axial flow check assembly 4.

[0023] In a preferred embodiment, such as Figure 3 As shown, a receiving groove 46 for accommodating the valve disc 45 is provided on the inner wall of the vortex plate 1 at the position corresponding to the valve pipe 41. When the eddy current diode 100 is flowing in the forward direction, based on the fluid pressure, the valve disc 45 overcomes the resistance of the sealing bellows 48 and the compression spring 410, causing the valve disc 45 to descend and be housed in the receiving groove 46, thereby reducing the fluid resistance in the vortex plate 1.

[0024] In this embodiment, the sealing bellows 48 can be made of high-temperature resistant alloy material, which can withstand molten salt conditions above 500°C for a long time; the sealing surface can be made of hard alloy overlay welding, which is wear-resistant and corrosion-resistant, ensuring long-term reliable sealing.

[0025] The eddy current diode 100 of this invention can be used for unidirectional flow control in molten salt energy storage / nuclear power, chemical or hydraulic systems. Its working principle or method is as follows: (1) Forward conduction state: Molten salt fluid enters the inner cavity of the vortex 1 from the axial pipe 2 and forms a vortex by high-speed rotation. It is discharged from the tangential pipe 3 along the tangential direction. When the molten salt fluid enters the axial pipe 2, it pushes the valve disc 45 to move downward against the elastic force of the compression spring 410 based on the fluid pressure. The axial channel is open and the molten salt fluid flows out through the vortex 1 and the tangential pipe 3, realizing forward low resistance conduction.

[0026] (2) Reverse check state: When the fluid flows in the reverse direction (from the tangential pipe 3 back to the vortex 1), due to the special structure of the eddy current diode, the reverse fluid cannot form an effective eddy current after entering the vortex 1, and the outlet resistance of the axial pipe 1 is extremely large, which inhibits the backflow of molten salt fluid; based on the disappearance of the forward fluid pressure, under the action of the compression spring 410, the valve disc 45 is pushed upward to reset and tightly fits the sealing surface at the outlet of the axial pipe at the top of the vortex 1, blocking the axial backflow, thereby achieving double check.

[0027] The present invention, through the above structure, takes into account both the unidirectional conduction characteristics of eddy current diodes and the forced sealing capability of axial flow anti-reverse components, and is suitable for working conditions with high requirements for unidirectional sealing, such as hydraulic systems, chemical pipelines, and energy transmission, and is especially suitable for high-temperature and corrosive fluid environments in molten salt energy storage.

[0028] The above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An eddy current diode with an axial flow check component, characterized in that, include: vortex disk (1); Axial tube (2), which is correspondingly arranged in the axial direction of the vortex (1) and communicates with the inner cavity of the vortex (1); A tangential tube (3), which is arranged along the circumferential tangential direction of the vortex disk (1) and communicates with the inner cavity of the vortex disk (1); and An axial flow anti-reverse component (4) is provided on the outside of the vortex (1) which is different from the axial tube (2) and is coaxially aligned with the axial tube (2). When the molten salt medium flows in the forward direction along the axial pipe (2), the molten salt medium pushes the axial flow check component (4) to open, and the fluid flows into the vortex (1) cavity through the axial pipe (2) with low resistance and flows out from the tangential pipe (3); When the molten salt medium is cut off and flows back in the reverse direction, the eddy current diode cavity generates high swirling resistance. At the same time, the axial flow anti-reverse component (4) quickly returns to its original position and seals with the axial tube (2) to achieve mechanical cut-off.

2. The eddy current diode with an axial flow check component according to claim 1, characterized in that, The axial flow anti-reverse assembly (4) includes: Valve pipe (41), the valve pipe (41) is coaxially arranged with the axial pipe (2) and is arranged on the side of the scroll plate (1) opposite to the axial pipe (2). The end of the valve pipe (41) is provided with a fixed flange (42). Valve cover (43), which is fixedly connected to the fixed flange (42) of the valve tube (41); Valve stem (44) passes through the side wall of the vortex (1), with its inner end extending into the connection between the axial tube (2) and the vortex (1), and its outer end extending into the valve tube (41). Valve disc (45), which is fixedly installed at the inner end of valve stem (44) and correspondingly seals the outlet of axial tube (2); A compression spring (410) is located inside the valve tube (41) and is fitted onto the valve stem (44). The compression spring (410) provides preload for the valve disc (45) to close.

3. The eddy current diode with an axial flow check component according to claim 2, characterized in that, The axial flow anti-reverse assembly (4) also includes: The first spring seat (49) is disposed at the outer end of the valve stem (44), and a first limiting post (491) is disposed on the outer side of the first spring seat (49). The second spring seat (411) is located inside the valve cover (43), and a second limiting post (412) is provided on the side of the second spring seat (411) near the compression spring (410). The two ends of the compression spring (410) are respectively sleeved on the first limiting post (491) and the second limiting post (412).

4. The eddy current diode with an axial flow check component according to claim 3, characterized in that, The second spring seat (411) is provided with a third limiting post (413) on the side away from the compression spring (410); the valve cover (43) is provided with a limiting hole (431) for the third limiting post (413) to be accommodated.

5. The eddy current diode with an axial flow check component according to claim 3, characterized in that, The axial flow anti-reverse assembly (4) also includes an isolation end plate (47) and a sealing bellows (48). The isolation end plate (47) is disposed at the root of the inner side of the valve tube (41), and the isolation end plate (47) separates the internal fluid channel of the vortex (1) from the spring chamber of the valve tube (41); The sealing bellows (48) is fitted outside the valve stem (44), and its two ends are respectively supported between the isolation end plate (47) and the first spring seat (49) to achieve dynamic sealing of the valve stem (44).

6. The eddy current diode with an axial flow check component according to claim 2, characterized in that, The inner wall of the vortex (1) is provided with a receiving groove (46) for accommodating the valve disc (45) at the position corresponding to the valve tube (41).

7. The eddy current diode with an axial flow check component according to claim 1, characterized in that, The vortex (1) is a spiral or disc-shaped cavity structure. The axial tube (2) is connected to the center of the vortex (1) disk surface, and the tangential tube (3) is tangentially connected to the edge of the vortex (1).

8. The eddy current diode with an axial flow check component according to claim 2, characterized in that, The valve disc (45) has a conical or spherical structure and forms a line seal or surface seal with the outlet of the axial pipe (2).

9. The eddy current diode with an axial flow check component according to any one of claims 1-8, characterized in that, The eddy current diode (100) is used for unidirectional flow control in molten salt energy storage / nuclear power, chemical or hydraulic systems.

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