Reusable superconducting coil vacuum pressure impregnation tool and method

Abstract

The invention discloses a reusable superconducting coil vacuum pressure impregnation tool and method, and relates to the technical field of superconducting coil preparation tools. Comprising a dipping tool cylinder, an upper cover plate, a lower cover plate, a coil outer support, a superconducting coil and a coil inner support, the two ends of the dipping tool barrel are detachably connected with the upper cover plate and the lower cover plate respectively; a vacuum joint is arranged on the upper cover plate; a glue injection opening is formed in the side wall of the dipping tool barrel; the coil outer support is arranged on the inner side of the superconducting coil, the coil inner support is arranged on the outer side of the superconducting coil, the coil outer support, the superconducting coil and the coil inner support are arranged on the lower cover plate, and the space between the coil outer support and the inner wall of the dipping tool barrel is filled with epoxy blocks. The device can adapt to superconducting coils of different sizes only by increasing or decreasing the volume of the filling epoxy block, the dipping tool does not need to be destructively disassembled when the coils are taken out, and it is ensured that the temperature is uniform when the whole tool is heated and cured through heating oil in an interlayer of the dipping tool.

Description

Technical Field

[0001] The present invention relates to the technical field of superconducting coil preparation tooling, in particular to a reusable superconducting coil vacuum pressure impregnation tooling and method. Background Art

[0002] Superconducting wire has zero electrical resistance at low temperatures. Winding it into superconducting coils can generate strong magnetic fields, enabling widespread application in fusion devices, accelerators, magnetic resonance imaging, magnetic separation, and other fields. Future applications of superconducting coils will require increasingly higher magnetic field intensities. Superconducting coils will need to withstand enormous electromagnetic forces in high-field environments. To strengthen the coil's structure, improve its electrical insulation, and ensure its safe and stable operation, the coils must undergo an impregnation and curing process.

[0003] The impregnation curing of superconducting coils generally adopts the vacuum pressure impregnation curing method. This method can make the epoxy resin completely fill the gaps inside the superconducting coil, so that the coil becomes a complete whole inside and outside after curing, thereby significantly enhancing the mechanical strength and insulation strength of the superconducting coil magnet.

[0004] Currently, vacuum pressure impregnation tooling is generally made by welding. After the impregnation and curing is completed, the vacuum pressure impregnation tooling needs to be destructively dismantled to remove the superconducting coil. Traditional impregnation tooling cannot be reused. For superconducting coils of different sizes, impregnation tooling of different sizes needs to be designed and processed. For multiple superconducting coils of the same size, multiple impregnation tooling of the same size design needs to be processed. This situation greatly increases the preparation cost of the superconducting coil.

[0005] Currently, vacuum pressure impregnation tooling is usually heated and cured by wrapping heating tape or placing the impregnation tooling in a temperature-controlled furnace for heating and curing. This method can easily cause the temperature of one position of the impregnation tooling to be abnormally higher than that of other positions, resulting in resin explosion. Summary of the Invention

[0006] The main purpose of the present invention is to provide a reusable superconducting coil vacuum pressure impregnation tooling and method to solve the above problems.

[0007] To achieve the above-mentioned objectives, the present invention provides a reusable superconducting coil vacuum pressure impregnation tooling, comprising an impregnation tooling cylinder, an upper cover plate, a lower cover plate, a coil outer support, a superconducting coil, and a coil inner support; the two ends of the impregnation tooling cylinder are detachably connected to the upper cover plate and the lower cover plate, respectively; a vacuum joint is provided on the upper cover plate; a glue injection port is provided on the side wall of the impregnation tooling cylinder; the coil outer support is placed on the inner side of the superconducting coil, the coil inner support is placed on the outer side of the superconducting coil, the coil outer support, the superconducting coil, and the coil inner support are placed on the lower cover plate, and an epoxy block is filled between the coil outer support and the inner wall of the impregnation tooling cylinder.

[0008] Furthermore, an interlayer is provided between the outer wall and the inner wall of the impregnation tool cylinder, and an oil filling port and an oil emitting port connected to the interlayer are provided on the outer wall of the impregnation tool cylinder. The height of the oil filling port is lower than the height of the oil emitting port, and the oil emitting port is close to the top of the impregnation tool cylinder.

[0009] Furthermore, two upper and lower observation ports are provided on the side wall surface of the impregnation tool cylinder, and the two observation ports are connected by a transparent hose for observing the height of the epoxy resin in the impregnation tool.

[0010] Furthermore, the vacuum joint of the upper cover plate is connected to the vacuum ball valve through a bellows, which is connected to the vacuum ball valve through a vacuum pump to maintain the vacuum environment required for vacuum impregnation, and is connected to the vacuum ball valve through a nitrogen bottle to provide pressure during impregnation and curing.

[0011] Furthermore, sealing grooves are provided on the end surfaces of both ends of the impregnation tool cylinder, and sealing gaskets are provided in the sealing grooves.

[0012] Furthermore, the upper cover plate, the lower cover plate and the impregnation tool cylinder are all provided with a plurality of bolt holes, and the two ends of the impregnation tool cylinder are respectively connected to the upper cover plate and the lower cover plate by bolts.

[0013] The present invention also provides an impregnation solidification removal method using the impregnation tool, comprising the following steps:

[0014] Step 1: Place the superconducting coil in the coil outer support, and the coil inner support in the superconducting coil to form an assembly. Place the assembly on the lower cover plate, connect the lower cover plate and the impregnation tooling cylinder with bolts, and use epoxy blocks to fill the gap between the impregnation tooling cylinder and the coil outer support. After filling, connect the impregnation tooling cylinder and the upper cover plate with bolts.

[0015] Step 2: Use a single transparent hose to connect the upper and lower observation ports, use a bellows to connect the vacuum connector on the upper cover, and connect the other end of the bellows to the vacuum ball valve;

[0016] Step 3: Use a vacuum pump to connect the oil outlet through a transparent hose, and the oil filling port to the thermal oil barrel through a transparent hose. Use the vacuum pump to suck the interlayer of the impregnation tool cylinder. Under the action of negative pressure, the thermal oil in the thermal oil barrel enters the interlayer from the oil filling port. When oil comes out of the oil outlet, turn off the vacuum pump and disconnect it. At the same time, use a clamp to clamp the transparent hoses at the oil filling port and the oil outlet.

[0017] Step 4: Use a vacuum pump to connect the vacuum ball valve, connect the glue injection tank to the glue injection port on the side wall of the impregnation tooling cylinder, open the vacuum pump and vacuum ball valve to remove the air inside the impregnation tooling, open the glue injection tank, and inject epoxy resin into the impregnation tooling;

[0018] Step 5: Observe the height of the epoxy resin through the transparent hose between the two observation ports. When the height reaches the required height, close the injection tank and stop injecting glue;

[0019] Step 6: After the glue injection is completed, close the vacuum ball valve, disconnect the vacuum ball valve from the vacuum pump, connect the nitrogen bottle to the vacuum ball valve, open the nitrogen bottle and the vacuum ball valve, and determine the internal pressure of the impregnation tooling through the gas pressure reducing valve. When the pressure reaches the required pressure, stop pressurizing and close the vacuum ball valve;

[0020] Step 7: Wrap the heating tape around the impregnation tooling and perform constant temperature curing according to the epoxy resin type and ratio used;

[0021] Step 8: After curing, remove the connecting bolts of the impregnation tooling cylinder, upper cover and lower cover, take out the epoxy block filled between the impregnation tooling cylinder and the outer support of the coil, and then directly separate the impregnation tooling cylinder, upper cover and lower cover, remove the coil from the lower cover, and use a debonding agent to clean the impregnation tooling cylinder, upper cover and lower cover for next use.

[0022] The present invention has the following beneficial effects:

[0023] (1) This design provides a reusable superconducting coil vacuum pressure impregnation tooling. This impregnation tooling only needs to increase or decrease the volume of the epoxy block to treat superconducting coils of different sizes;

[0024] (2) When removing the coil from the impregnation tool, only the connecting bolts between the impregnation tool parts need to be removed. After removing the epoxy block, the coil can be directly removed without the need for destructive dismantling of the impregnation tool.

[0025] (3) By impregnating the interlayer of the tooling with heating oil, the temperature of the entire tooling is ensured to be uniform during heating and curing, thereby avoiding explosion caused by uneven temperature.

[0026] This design is simple and convenient to use, reduces the cost of purchasing different immersion vacuum containers, saves both time and economic costs, and provides convenience for the preparation of superconducting coils. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a reusable superconducting coil vacuum pressure impregnation tooling according to the present invention;

[0028] Figure 2 This is a schematic diagram of an impregnation tool cylinder of a reusable superconducting coil vacuum pressure impregnation tool of the present invention;

[0029] Figure 3 This is a cross-sectional view of an impregnation tool cylinder of a reusable superconducting coil vacuum pressure impregnation tool of the present invention;

[0030] Figure 4 This is a schematic diagram of the upper cover plate of a reusable superconducting coil vacuum pressure impregnation tooling of the present invention.

[0031] Among them, 1-impregnation tooling cylinder; 2-upper cover; 3-lower cover; 4-coil external support; 5-superconducting coil; 6-coil internal support; 7-sealing groove; 8-observation port; 9-glue injection port; 10-oil injection port; 11-oil outlet. DETAILED DESCRIPTION

[0032] In order to achieve the above-mentioned objectives and effects, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0033] like Figure 1 As shown, the present invention provides a reusable superconducting coil vacuum pressure impregnation tooling and method, comprising an impregnation tooling cylinder 1, an upper cover plate 2, a lower cover plate 3, a coil external support 4, a superconducting coil 5, and a coil internal support 6. The upper cover plate 2, the lower cover plate 3 and the impregnation tooling cylinder 1 are all provided with a plurality of bolt holes so that the two ends of the impregnation tooling cylinder 1 can be connected to the upper cover plate 2 and the lower cover plate 3 respectively by bolts.

[0034] like Figure 2 As shown in Figure 3, the impregnation tool cylinder has a sealing groove 7, an observation port 8, a glue injection port 9, an oil injection port 10, an oil outlet 11 and an interlayer. Sealing grooves 7 are provided on the end faces of both ends of the impregnation tool cylinder 1. The sealing grooves 7 are used to place sealing gaskets. The sealing gaskets provide sealing for the impregnation tool. To ensure the seal, the gap can be filled with vacuum sealant. Two upper and lower observation ports 8 are provided on the side wall surface of the impregnation tool cylinder 1. The two observation ports 8 are connected by a transparent hose for observing the height of the epoxy resin in the impregnation tool. An interlayer is provided between the outer wall and the inner wall of the impregnation tool cylinder 1. An oil injection port 10 and an oil outlet 11 connected to the interlayer are provided on the outer wall of the impregnation tool cylinder 1. The height of the oil injection port 10 is lower than the height of the oil outlet 11, and the oil outlet 11 is close to the top of the impregnation tool cylinder 1. Observation port 8 and glue injection port 9 are welded to the inner wall of the impregnation tooling barrel for injecting glue and observing the glue surface height. Oil injection port 10 and oil vent 11 are welded to the outer wall for injecting thermal oil into the interlayer. Injecting thermal oil into the interlayer prevents resin implosion caused by uneven temperature on the inner wall of the barrel during the degassing and curing processes.

[0035] like Figure 4 As shown, a vacuum joint is welded to the upper cover plate 2. This joint is mainly used for vacuuming and pressurizing, and can be controlled by connecting a vacuum ball valve to the vacuum joint. A vacuum pump is connected to the vacuum ball valve to maintain the vacuum environment required for vacuum impregnation, and a nitrogen bottle is connected to the vacuum ball valve to provide pressure during impregnation and curing.

[0036] The present invention also provides an impregnation solidification removal method using the impregnation tool, which is characterized by comprising the following steps:

[0037] Step 1: Place the superconducting coil 5 inside the coil outer support 4, and the coil inner support 6 inside the superconducting coil 5 to form an assembly, place the assembly on the lower cover plate 3, connect the lower cover plate 3 and the impregnation tool cylinder 1 with bolts, fill the gap between the impregnation tool cylinder 1 and the coil outer support 4 with epoxy blocks, and after filling, connect the impregnation tool cylinder 1 and the upper cover plate 2 with bolts;

[0038] Step 2: Use a single transparent hose to connect the upper and lower observation ports 8, use a bellows to connect the vacuum connector on the upper cover 2, and connect the other end of the bellows to the vacuum ball valve;

[0039] Step 3: Use a vacuum pump to connect the oil outlet 11 through a transparent hose, and the oil filling port 10 to the thermal oil barrel through a transparent hose. Use the vacuum pump to suck the interlayer of the impregnation tool cylinder 1. Under the action of negative pressure, the thermal oil in the thermal oil barrel enters the interlayer from the oil filling port 10. When oil comes out of the oil outlet 11, turn off the vacuum pump and disconnect it. At the same time, use a clamp to clamp the transparent hoses at the oil filling port 10 and the oil outlet 11.

[0040] Step 4: Use a vacuum pump to connect the vacuum ball valve, connect the glue injection tank to the glue injection port 9 on the side wall of the impregnation tooling cylinder 1, open the vacuum pump and the vacuum ball valve, remove the air inside the impregnation tooling, open the glue injection tank, and inject epoxy resin into the impregnation tooling;

[0041] Step 5: Observe the height of the epoxy resin through the transparent hose between the two observation ports 8. When the height reaches the required height, close the injection tank and stop injecting the glue;

[0042] Step 6: After the glue injection is completed, close the vacuum ball valve, disconnect the vacuum ball valve from the vacuum pump, connect the nitrogen bottle to the vacuum ball valve, open the nitrogen bottle and the vacuum ball valve, and determine the internal pressure of the impregnation tooling through the gas pressure reducing valve. When the pressure reaches the required pressure, stop pressurizing and close the vacuum ball valve;

[0043] Step 7: Wrap the heating tape around the impregnation tooling and perform constant temperature curing according to the epoxy resin type and ratio used;

[0044] Step 8: After the curing is completed, remove the connecting bolts of the impregnation tool cylinder 1, the upper cover plate 2 and the lower cover plate 3, take out the epoxy block filled between the impregnation tool cylinder 1 and the coil outer support 4, and then directly separate the impregnation tool cylinder 1, the upper cover plate 2 and the lower cover plate 3, remove the coil from the lower cover plate 3, and use a degumming agent to clean the impregnation tool cylinder 1, the upper cover plate 2 and the lower cover plate 3 for next use.

[0045] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

Claims

1. A reusable superconducting coil vacuum pressure impregnation tooling, characterized in that: The invention comprises an impregnation tool cylinder (1), an upper cover plate (2), a lower cover plate (3), a coil outer support (4), a superconducting coil (5), and a coil inner support (6); the two ends of the impregnation tool cylinder (1) are detachably connected to the upper cover plate (2) and the lower cover plate (3); a vacuum joint is provided on the upper cover plate (2); a glue injection port (9) is provided on the side wall of the impregnation tool cylinder (1); the coil outer support (4) is placed on the inner side of the superconducting coil (5), the coil inner support (6) is placed on the outer side of the superconducting coil (5), the coil outer support (4), the superconducting coil (5) and the coil inner support (6) are placed on the lower cover plate (3), and epoxy blocks are filled between the coil outer support (4) and the inner wall of the impregnation tool cylinder (1).

2. A reusable superconducting coil vacuum pressure impregnation tool as claimed in claim 1, characterized in that: An interlayer is provided between the outer wall and the inner wall of the impregnation tool cylinder (1); an oil filling port (10) and an oil emitting port (11) communicating with the interlayer are provided on the outer wall of the impregnation tool cylinder (1); the height of the oil filling port (10) is lower than the height of the oil emitting port (11); and the oil emitting port (11) is close to the top of the impregnation tool cylinder (1).

3. The reusable superconducting coil vacuum pressure impregnation tooling according to claim 2, characterized in that: The side wall surface of the impregnation tool cylinder (1) is provided with two upper and lower observation ports (8), which are connected by a transparent hose and are used to observe the height of the epoxy resin in the impregnation tool.

4. A reusable superconducting coil vacuum pressure impregnation tool as claimed in claim 3, characterized in that: The vacuum joint of the upper cover plate (2) is connected to the vacuum ball valve via a bellows, which is connected to the vacuum ball valve via a vacuum pump for maintaining the vacuum environment required for vacuum impregnation, and is connected to the vacuum ball valve via a nitrogen bottle for providing pressure during impregnation and curing.

5. The reusable superconducting coil vacuum pressure impregnation tooling according to claim 4, characterized in that: Sealing grooves (7) are provided on the end surfaces of both ends of the impregnation tool cylinder (1), and sealing gaskets are provided in the sealing grooves (7).

6. The reusable superconducting coil vacuum pressure impregnation tooling according to claim 5, characterized in that: The upper cover plate (2), the lower cover plate (3) and the impregnation tool cylinder (1) are all provided with a plurality of bolt holes, and the two ends of the impregnation tool cylinder (1) are respectively connected to the upper cover plate (2) and the lower cover plate (3) by bolts.

7. A method for removing a superconducting coil by impregnation and curing using the reusable superconducting coil vacuum pressure impregnation tool as claimed in claim 6, characterized in that: The following steps are involved: Step 1: Place the superconducting coil (5) in the coil outer support (4), place the coil inner support (6) in the superconducting coil (5) to form an assembly, place the assembly on the lower cover (3), connect the lower cover (3) and the impregnation tool cylinder (1) with bolts, fill the gap between the impregnation tool cylinder (1) and the coil outer support (4) with epoxy blocks, and after filling, connect the impregnation tool cylinder (1) and the upper cover (2) with bolts; Step 2: Use a single transparent hose to connect the upper and lower observation ports (8), use a bellows to connect the vacuum connector on the upper cover (2), and connect the other end of the bellows to the vacuum ball valve; Step 3: Use a vacuum pump to connect the oil outlet (11) through a transparent hose, and the oil filling port (10) is connected to the thermal oil barrel through a transparent hose. Use the vacuum pump to suck the interlayer of the impregnation tool cylinder (1). Under the action of negative pressure, the thermal oil in the thermal oil barrel enters the interlayer from the oil filling port (10). When oil comes out of the oil outlet (11), turn off the vacuum pump and disconnect it. At the same time, use a clamp to clamp the transparent hoses at the oil filling port (10) and the oil outlet (11); Step 4: Use a vacuum pump to connect the vacuum ball valve, connect the glue injection tank to the glue injection port (9) on the side wall of the impregnation tool cylinder (1), open the vacuum pump and the vacuum ball valve, remove the air inside the impregnation tool, open the glue injection tank, and inject epoxy resin into the impregnation tool; Step 5: Observe the height of the epoxy resin through the transparent hose between the two observation ports (8), and when the height reaches the required height, close the injection tank and stop injecting the glue; Step 6: After the glue injection is completed, close the vacuum ball valve, disconnect the vacuum ball valve from the vacuum pump, connect the nitrogen bottle to the vacuum ball valve, open the nitrogen bottle and the vacuum ball valve, and determine the internal pressure of the impregnation tooling through the gas pressure reducing valve. When the pressure reaches the required pressure, stop pressurizing and close the vacuum ball valve; Step 7: Wrap the heating tape around the impregnation tooling and perform constant temperature curing according to the epoxy resin type and ratio used; Step 8: After the curing is completed, remove the connecting bolts of the impregnation tool cylinder (1), the upper cover plate (2) and the lower cover plate (3), take out the epoxy block filled between the impregnation tool cylinder (1) and the coil outer support (4), and then directly separate the impregnation tool cylinder (1), the upper cover plate (2) and the lower cover plate (3). Take out the coil from the lower cover plate (3), and use a degumming agent to clean the impregnation tool cylinder (1), the upper cover plate (2) and the lower cover plate (3) for next use.

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