JP2008060290A - Method for impregnating superconducting coil with resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for impregnating a superconducting coil with a resin capable of avoiding the remainder of a void in the superconducting coil, and inhibiting the generation of a quenching. <P>SOLUTION: In the method for impregnating the superconducting coil with the resin; the annular superconducting coil is housed in a housing vessel with an annular housing, the resin is injected to the housing, and the superconducting coil is impregnated with the resin. In the method, a trench inclined to a horizontal plane is formed to the top face of the housing, and the resin in the housing is pressed and vibrated after the completion of the injection of the resin to the housing. The remaining of the void in the superconducting coil is avoided, and the generation of the quenching can be inhibited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resin impregnation method for a superconducting coil, and more particularly to a resin impregnation method suitable for application to a superconducting coil of an MRI (Magnetic Resonance Imaging) apparatus (hereinafter referred to as “MRI apparatus”) which is a medical device.

  The superconducting coil employs a method of hardening the superconducting coil with a resin so that a large electromagnetic force acts and insulation between the coil wires is ensured. The impregnation of the superconducting coil with the resin needs to minimize the residual voids in the coil that cause a quench (transition from the superconducting state to the normal conducting state).

  As a conventional resin impregnation method for coils, a vacuum / pressure impregnation method (hereinafter referred to as “VIP method”) is generally employed. In the VIP method, after deaeration is normally performed in a vacuum state (10 to 50 Pa), the coil is filled with a resin, and the void remaining in the coil (the void that flows along with the resin when the resin is injected, the degree of vacuum in the coil) Pressurize voids generated under the influence of This reduces the void volume and avoids its effects.

  In the VIP method, since it is difficult to eliminate voids remaining in the coil, which is important in the superconducting coil, the following method has been proposed.

Patent Document 1 describes a method of injecting resin from the lower center of the coil based on the VIP method as a method for impregnating resin into a coil composed of Nb ₃ Sn superconducting wires covered with glass fiber. Yes. However, in this method, since the degree of vacuum of the deaeration container and the impregnation container is not adjusted and controlled, the residual gas remaining in the piping between the deaeration container and the valve is injected first when resin is injected into the coil. It remains in the coil. Moreover, since the resin in which the void generated by the pressure reduction of the impregnating resin is mixed is injected, the void remains in the coil. Furthermore, voids may be generated from the resin impregnated in the coil due to the continuation of the vacuum state. In addition, since the resin enters and solidifies in the narrow gaps of the winding frame, the plug, the outside of the coil, and the container, there is a problem that it is difficult to take out the coil.

  Patent Document 2 discloses a resin impregnation based on the VIP method in which a coil having a large amount of an insulating layer generates an impregnation path in the insulating layer, and a resin injection speed is set to be equal to or less than a speed at which the resin penetrates the insulator in the coil. A method is described. However, in this method, it takes a long time for the resin to permeate the insulator in the coil, and the gelation with the aging of the resin proceeds. Therefore, the resin viscosity increases, and the penetration of the resin into the coil may be impaired. In addition, since the resin in the pipe between the stirring defoaming tank and the injection valve is not stirred, there is a problem that when it is injected into the coil, it does not solidify.

  Patent Document 3 basically uses the VIP method, but there is no stirrer in the deaeration tank, and a method is described in which resin is dropped into the impregnation tank in a vacuum and the resin is impregnated into the superconducting coil. Has been. At that time, in order to avoid the non-impregnated region (void), the impregnation device is described in which rotational force, axial vibration, vibration + compression force is applied to the superconducting coil, and AC power source and ultrasonic generator are connected to the superconducting coil. Has been. However, in this method, since there is no stirrer in the degassing tank, degassing is insufficient. Furthermore, the resin at the lower end of the deaeration tank is subjected to a pressure corresponding to the height of the resin, and when the resin is dropped into the second impregnation vessel in vacuum, dissolved gas or the like in the resin is deposited at that time. It becomes a void and exists in the resin. When such a resin is impregnated in the coil, a large amount of voids enter the coil. Further, when a rotational force, vibration, or the like is applied to a resin that is not sufficiently degassed, there is a problem that dissolved gas in the resin is likely to precipitate.

  In Patent Document 4, the VIP method is basically used, but the deaeration tank does not have a stirrer, and is sucked from a hole provided in the winding drum, and a pressure difference is applied to the inside and outside of the coil portion to introduce resin from the outer peripheral portion. A manufacturing method and a manufacturing apparatus for suction impregnation and curing in a coil are described. However, in this method, there is a pressure difference between the inside and outside of the coil portion, the resin flow to the suction pipe connecting portion is large, and an unimpregnated area may occur in the upper corner portion of the coil. In addition, since the suction side is at a lower pressure than the saturated state of the dissolved gas of the injected resin, a difference gas from the saturated dissolved gas of the suction side pressure is precipitated from the resin injected into the coil, There are remaining issues. Moreover, since there is no stirrer in the degassing tank, there is a problem that degassing becomes insufficient.

  When a thermosetting resin is used, after the impregnation in the coil is completed, the temperature is raised and the resin is cured. Therefore, it is important to know the resin impregnation time. If the resin is impregnated without knowing the resin impregnation time in the coil, depending on the coil structure, the resin may be cured in a state where there is an unimpregnated region, or the vacuum impregnation state is maintained for a long time, resulting in the risk of void formation in the resin. There are problems such as increasing the size. In Patent Documents 1 to 4, there is no description for knowing the resin impregnation time. Therefore, the transition to the resin curing process becomes ambiguous, and problems remain with resin impregnation in a mass production system.

Japanese Patent Laid-Open No. 11-154607 JP 2001-189226 A JP-A-5-152118 JP-A-9-283326

  Problem 1: In recent MRI apparatuses, in order to achieve high resolution, there is an urgent need to develop a densely wound coil that can generate a high magnetic field. When a closely coiled coil is used, the gap between the coil wires is very narrow and the flow resistance is increased. Therefore, in the vacuum impregnation which is the VIP method, a long time is required until the entire coil is impregnated, and unimpregnation and voids remain a problem. In this tightly wound coil, the electromagnetic force acting on the coil is also large, so if a minute void remains in the gap between the coil wires, the void will crack at the beginning, and quenching will occur due to frictional heat accompanying the movement of the coil become. Further, if the main component of the injected resin and the curing agent are not sufficiently mixed, the resin is not solidified, so that sufficient strength cannot be obtained, and quenching occurs. Therefore, it is necessary to construct a resin impregnation method in which the resin strength in the coil is sufficient and the residual voids are suppressed. Although Patent Documents 1 to 4 are also considered as resin impregnation methods for eliminating voids or unimpregnated regions in the coil, there are some problems, and no resin impregnation technique has been established. In resin impregnation of a superconducting coil using a thermosetting resin, the resin impregnation completion time is important. By knowing the resin impregnation completion time, it is possible to shift to the next resin curing step. If the resin impregnation completion time is unknown, generation of a resin non-impregnated region in the coil and generation of voids in the resin are induced.

  Problem 2: In Patent Documents 1 to 4, there is a description of a resin impregnation method for each coil. However, a main coil, a shield coil, and the like are different in size in a densely wound coil used for one MRI. There are coils, and if these are manufactured individually, enormous time and cost are required. That is, there is a problem that measures for shortening the resin impregnation time and cost are not taken for mass production. In addition, there are problems in which measures such as ease of handling, disassembly and cleaning of the resin impregnation apparatus have not been taken.

  An object of the present invention is to provide a resin impregnation method for a superconducting coil that can prevent the void from remaining in the superconducting coil and suppress the occurrence of quenching.

  A superconducting coil resin impregnation method in which an annular superconducting coil is housed in a housing container having an annular housing portion, and then the resin is injected into the housing portion to impregnate the superconducting coil with the resin. Has a groove inclined with respect to the horizontal plane, and applies pressure vibration to the resin in the storage section after the injection of the resin into the storage section is completed.

  According to the present invention, an object of the present invention is to provide a resin impregnation method for a superconducting coil that can prevent the void from remaining in the superconducting coil and suppress the occurrence of quenching.

  Since the issues 1 and 2 have several different issues, first, each issue and solving means are listed.

  Problem 1-1: Voids using dissolved gas as a source are mixed in the resin impregnated in the superconducting coil. When this resin is impregnated into the superconducting coil, voids remain in the coil.

  Solution to Problem 1-1: Precipitation of water in the resin and dissolved gas contained in the solvent is defined by the saturated state of the dissolved gas. In other words, the resin temperature is kept constant, and the degree of vacuum at the time of resin impregnation into the coil is reduced to the same level or slightly lower than the degree of vacuum at the time of resin degassing before resin impregnation, so that it is unsaturated and dissolved in the injected resin. Suppresses gas precipitation. However, even with this measure, there is a possibility that a slight amount of gas may be mixed in the resin-impregnated region in the coil by reducing the degree of vacuum to a level equivalent to or slightly lowering the vacuum. As a means for discharging this gas out of the coil, a groove having an inclination is provided in the FRP spacer (upper part inside the storage container for storing the coil) above the coil so that the void is easily discharged out of the coil. Further, after the resin impregnation in the coil is completed, the pressure is changed and the pressure is reduced, the residual void is changed due to the pressure difference, and the void is discharged out of the coil. This suppresses residual voids in the coil.

  Problem 1-2: The closely wound coil has a very narrow gap between the coil wires and a large flow resistance. Therefore, in the vacuum impregnation that is the VIP method, it takes a long time until the entire coil is impregnated, and the remaining of voids due to unimpregnation and precipitation of dissolved gas generated by decompression becomes a problem.

  Solution for Problem 1-2: A resin injection method is adopted in which a vacuum is maintained at the time of resin injection into the impregnation container, but the resin liquid level is set to the specified liquid level at the top of the coil as soon as possible and the process immediately shifts to pressure impregnation. Thereby, the vacuum holding time in the coil is shortened, and the risk of void generation due to the reduced pressure in the coil can be reduced.

  Problem 1-3: The thermosetting resin, which is a resin used for resin impregnation of the coil, increases the temperature after the resin is impregnated in the coil and enters the curing process, but does not know the impregnation time in the coil And it is unclear when the temperature and pressure change for curing can be performed. For this reason, there is a possibility that after the curing process, the solidification occurs in a state where there is an unimpregnated region.

  Solution for Problem 1-3: It is important to grasp the impregnation time in the coil in order to eliminate the unimpregnated region. In the closely wound coiled coil, the resin flows into a flow path in a gap formed at the center of the three coil wires. The flow rate Q flowing into the flow path can be derived from the formula (2) newly invented by the inventors based on the formula (1) of the laminar friction loss in the pipe.

ΔP = 64 / Re × L / D × (ρV 2 / 2g) ... (1)
Q = {√ (1 / (64 / Re × L / (D × α) × 1/2 g × ρ / ΔP)) × A} × β (2)
ΔP: pressure loss of the flow path, Re: Reynolds number, L: flow path length, D: flow path diameter (equivalent diameter), ρ: fluid density, V: flow velocity, g: acceleration of gravity, A: flow path area, β: Number of coil inlets, α: Equivalent diameter correction coefficient that changes with winding tension Using equation (2), the resin inflow amount Q in the resin impregnation state that changes from time to time is calculated, and the integrated value of the resin inflow amount Q is The resin impregnation is completed when the volume is equal to the resin impregnation volume of the coil. The resin impregnation time is the resin impregnation time. This resin impregnation time is a base of the resin impregnation process, and if the resin impregnation time is known, the temperature and pressure of the resin can be controlled. As a result, a resin impregnation step without contradiction can be assembled.

  Problem 1-4: In a closely wound coil, the resin impregnation gap in the coil is very narrow and the pressure loss during resin impregnation is large. Therefore, the inflow amount is limited and the impregnation time is long. Furthermore, the thermosetting resin to be impregnated becomes viscous and gels in a short time with time. This increases the flow resistance in the coil and reduces the inflow. Therefore, it is necessary to shorten the impregnation time in the coil and complete the resin impregnation into the coil before gelation.

  Solution for Problem 1-4: Using equation (2), analyze the winding tension and the number of inlets, which are factors affecting the impregnation time, reflect these in the coil system, and contradict the resin curing process. Avoiding and determining a series of resin impregnation steps. For example, when the resin impregnation time becomes long, the resin impregnation time for the coil is shortened by providing a large number of grooves serving as resin injection ports in the FRP spacers at the upper and lower portions of the coil. Moreover, by reducing the coil tension to loosen the space between the coil wires, the equivalent diameter increases and the resin easily flows.

  Problem 1-5: There is a possibility that a resin liquid in which the main component of the injected resin and the curing agent are not sufficiently mixed is accumulated in the resin injection pipe below the vacuum deaeration container. When this resin liquid is injected into the coil, the resin is not solidified, so that sufficient strength cannot be obtained, causing a quench phenomenon.

  Solution for Problem 1-5: When injecting resin into the coil impregnation vessel after vacuum deaeration, the valve on the upstream drain pipe immediately above the valve provided in the resin injection pipe below the vacuum deaeration vessel is opened and vacuum is applied. Undeaerated resin agent accumulated in the resin injection pipe below the deaeration container is discharged to the drain tank. As a result, the resin after vacuum deaeration is exchanged and accumulated in the resin injection pipe.

  Problem 2-1: Coils used in the MRI apparatus include coils having different sizes such as a main coil and a shield coil, and if these are individually manufactured by one resin impregnation apparatus, enormous time and cost are required. Become. That is, no measures for shortening the resin impregnation time and cost are taken for mass production.

  Solution for Problem 2-1: Using a plurality of Dutch oven type resin impregnated containers in which different sizes of coils, such as a main coil and a shield coil used in one MRI apparatus, are matched to the shape thereof, and resin for each coil The impregnation time is determined by the equation (2) to determine the impregnation step, and the resin impregnation apparatus performs the respective resin impregnation simultaneously. In this apparatus, a common vacuum deaeration part of the injected resin is used. As a result, the resin impregnation time of various coils can be shortened and costs such as electric heating costs can be reduced.

  Problem 2-2: Measures such as ease of handling and disassembly / cleaning of the resin impregnation apparatus are not taken.

  Solution for Problem 2-2: In the resin impregnation apparatus according to the present invention, the connection between the pipes and the container is constituted by a flange and a screwed joint that can be easily removed, and the vacuum deaeration container and the resin injection pipe are After the resin is poured into the impregnation container, it can be removed immediately. Therefore, each part can be removed and cleaned in a state where the resin does not harden. Moreover, the coil after resin hardening can be easily taken out by making a resin impregnation vacuum container and a resin impregnation container different. Therefore, the transition to the next resin impregnation step can be performed smoothly, which can contribute to time and cost reduction.

  The problems 1 and 2 and the solving means 1 and 2 are summarized as follows. That is, the problem 1 is that 1) a void caused by dissolved gas generated during vacuum impregnation is mixed in the coil, and 2) a coil wire tube with a very narrow gap and a large pressure loss, such as a closely wound coil, When the resin is impregnated under the conditions, it takes a long time for the resin to be impregnated, and the voids remain due to the unimpregnated resin in the coil and precipitation of dissolved gas generated by the reduced pressure. 3) The thermosetting resin to be impregnated is 4) The thermosetting resin that is used for resin impregnation of the coil is heated and cured after the coil is impregnated with the resin. 5) If the completion time of impregnation in the coil is not grasped, 5) The resin in the resin injection tube from the resin mixing / degassing device is not sufficiently mixed / degassed with the resin main agent and curing agent. Is that .

  Solution means 1 for solving Problem 1 is as follows. That is, 1) A large number of inclined grooves are provided in the FRP spacer at the top of the coil to facilitate the discharge of voids. Furthermore, after the resin impregnation in the coil is completed, a sudden change of pressurization / depressurization is applied, and the residual void is changed by the pressure difference, and discharged outside the coil. In order to apply a change in pressure and pressure, the resin impregnated container is made as small as possible so that a sudden change in pressure and pressure can be brought about. 2) Instead of using vacuum impregnation, which is the VIP method, the vacuum is maintained when the resin is poured into the impregnation vessel, but the resin liquid level is set to the specified liquid level at the top of the coil as soon as possible, and the process immediately shifts to pressure impregnation. Adopt resin injection method. 3) The resin impregnation time for the coil is shortened by providing a large number of grooves as resin injection ports in the FRP spacers at the upper and lower portions of the coil. 4) Determining the resin impregnation time by deriving the flow rate flowing into the coil by the equation (2). 5) As a resin impregnation device, open the valve on the upstream drain pipe immediately above the valve provided in the resin injection pipe below the vacuum degassing container, and keep the undegassed inside the resin injection pipe below the vacuum degassing container. The resin composition is discharged to the drain tank.

  Problem 2 is: 1) The closely wound coils used in the MRI apparatus include a wide variety of coils such as a main coil and a shield coil, and if these coils are individually manufactured with a single resin impregnating apparatus, it is enormous. 2) The measures for handling the resin impregnating device and the ease of disassembling / cleaning are not taken.

  Solution means 2 for solving Problem 2 is as follows. That is, 1) A resin impregnation apparatus that simultaneously impregnates each coil with a resin by using a Dutch oven type resin impregnation container having various coil shapes with different sizes. In this apparatus, a common vacuum deaeration part of the injected resin is used. 2) The pipes and containers of the resin impregnation equipment are connected with flanges, screwed joints, etc. that are easy to remove. The vacuum deaeration container and the resin injection pipe are configured so that they can be removed immediately after the resin is injected into the impregnation container. By making the resin-impregnated vacuum container and the resin-impregnated container different from each other, a structure in which the coil after the resin is cured can be easily taken out.

  According to the present invention, a superconducting coil using a superconducting material can be a high-performance quenchless coil that avoids coil non-impregnation, and provides a resin impregnation apparatus suitable for mass production of superconducting coils. Can do.

  FIG. 1 shows the overall configuration of a resin impregnation apparatus for superconducting coils according to the present invention. The resin impregnation method is basically autoclave molding by a pressure impregnation method. First, the configuration of the outline of the resin impregnation apparatus for the superconducting coil will be described. The resin impregnation device for the superconducting coil includes one mixing / degassing device 1 for mixing and degassing the resin, and a plurality of Dutch oven type resin impregnation devices 2a and 2b for impregnating the coil with the mixed and degassed resin. And a vacuum piping system 3 that performs vacuum and pressurization of these devices, a pressure piping system 4, and a measurement system for grasping the state of each device.

  Here, the symbols of the piping system installation equipment will be described. VV-n is a vacuum system valve, PV-n is a pressurization system valve, IV-n is a resin injection system valve, DV-n is a drain valve, and AV-n is an air release system valve. . As a measuring meter, PG is a strain pressure gauge, PB-n is a Bourdon tube pressure gauge (with negative pressure display), VG is a vacuum gauge, and Tn is a thermocouple thermometer. As a heater control system, TC is a temperature controller, and LC is an output power controller.

  The vacuum / pressure piping system will be described. The vacuum system is maintained at a vacuum by a vacuum pump 5, and the system is connected to the vacuum vessel 6 of the mixing / degassing device 1 via the vacuum valve VV-3, vacuum valves VV-4, 5 Connected to the Dutch oven type resin impregnation vessel 7a, 7b of the Dutch oven type resin impregnation device 2a, 2b, to another Dutch oven type resin impregnation device (not shown) via the vacuum valve VV-6. Some are connected.

  The pressurization piping system pressurizes with a gas supplied from a high-pressure dry air cylinder 8 (which may be a compressor), and the system is a vacuum container of the mixing / deaeration device 1 via a pressurization valve PV-3. 6, supplied through the pressurizing valves PV-4, 5 to the Dutch oven type resin impregnation apparatuses 7a, 7b of the Dutch oven type resin impregnating apparatuses 2a, 2b, via the pressurizing valve PV-6 Some of them are supplied to other Dutch oven type resin impregnation apparatuses (not shown).

  The resin supply system from the mixing / degassing apparatus 1 to the Dutch oven type resin impregnation containers 7a and 7b supplies the resin to the Dutch oven type resin impregnation apparatus 2a through the resin injection valve IV-3 and the resin supply valve IV-4. A system for supplying resin to the Dutch oven type resin impregnation apparatus 2b by the resin supply valve IV-5, and a system for supplying resin to another Dutch oven type resin impregnation apparatus (not shown) by the resin supply valve IV-6. is there. This system uses a swage lock joint and can be easily attached and detached. Drain valves (DV-1, DV-2, DV-3) are provided upstream of the valve and in the vicinity of the valve in IV-3, IV-4, IV-5, IV-6, which are valves of this system. It is done. Here, when the drain valve DV-1 injects the resin mixed and degassed by the mixing and degassing device 1, the drain valve DV-1 first extracts the resin that is insufficiently mixed and degassed first in the resin supply system piping. Used for. The drain valve DV-1 is used for draining excess resin in the mixing / degassing apparatus 1 after the resin injection into the Dutch oven type resin impregnation containers 7a and 7b is completed. Furthermore, a sampling tube for checking the viscosity of the injected resin is also provided. After the resin injection into the Dutch oven type resin impregnated containers 7a and 7b is completed and the resin supply valves IV-4 and IV-5 are closed, the drain valve DV- in the vicinity of the upstream of the resin supply valves IV-4 and IV-5 is provided. 2, DV-3 is opened, and the resin accumulated in the pipe is drained when the resin is still in a liquid state. In addition, the heater 9 and the thermocouple thermometer 10 are provided in the pipe | tube outer side of this resin injection | pouring system, and the temperature of the resin which passes a pipe | tube is controlled to regulation temperature.

  By adopting such an injection system configuration, it is possible to control the temperature at the time of resin injection, and discharge the resin that is insufficiently mixed and degassed at the initial stage of resin injection. Further, the disassembly in a state where the resin is attached as a liquid, that is, the upstream disassembly can be performed immediately after the resin supply valves IV-4 and IV-5 are closed. Therefore, the adhering resin is not solidified. Moreover, when it transfers to pressurization impregnation, resin supply valve IV-4, IV-5 is removed by removing resin supply valve IV-4, IV-5 in an atmospheric pressure state, and attaching a stopper plug to the downstream piping. Can be washed. Therefore, since the resin can be washed in a liquid state, there is an effect that washing with a solvent can be easily performed.

  Next, the characteristics of the thermosetting resin will be described. FIG. 2 shows the relationship between temperature and resin viscosity in the resin impregnation step. In FIG. 2, the horizontal axis represents the elapsed time from the deaeration process, and the vertical axis represents temperature and viscosity. In normal coil resin impregnation using a thermosetting resin, the temperature is maintained at the impregnation temperature after resin mixing (main agent / curing agent) and deaeration, and the coil is impregnated. Thereafter, the resin is cured by raising the temperature to the first curing temperature and the second curing temperature. Even when the thermosetting resin is maintained at the temperature of impregnation into the coil, gelation occurs due to aging and the viscosity increases. Therefore, when the resin is impregnated, the pressure loss in the coil becomes large, and the inflow amount is limited. Thus, when the impregnation time becomes long, an unimpregnated region is generated in the coil.

  Therefore, it is desirable to complete the impregnation of the resin into the coil in a short time (about 10 hours). That is, the resin impregnation apparatus needs to be an apparatus that completes the resin impregnation into the coil in a short time, and furthermore, an optimum resin impregnation method is required.

  Details of the mixing / degassing device 1 and the Dutch oven type resin impregnation devices 2a and 2b studied by the inventors under such a concept will be described below.

First, the mixing / degassing apparatus 1 shown in FIG. 3 will be described. The structure of the mixing / degassing device 1 includes a vacuum / pressurized container 11 mainly having a flange structure at the top, an agitating resin reservoir 12 accommodated therein, and a resin 62 accumulated in the agitating resin reservoir 12. And an agitator 13 for agitating. Here, to the upper flange of the vacuum / pressure vessel 11, a stirrer drive device 13, a viewing window 14, a resin main agent injection system 15, a resin hardener injection system 16, a vacuum system 3, and a pressure system 4 are attached. ing. Further, a Bourdon tube pressure gauge 17 is attached to the pipe where the vacuum system 3 and the pressurizing system 4 are joined to know the pressure of the system. The leading ends of the resin main agent injection system 15 and the resin curing agent injection system 16 have a structure that guides the resin agent into the stirred resin reservoir 12. Agitator blades 18 are installed in the agitation resin reservoir 12. In addition, a heater 19 and a thermocouple thermometer 20 (T14) for maintaining the resin temperature are installed outside the stirring resin reservoir 12. This temperature is controlled by an external temperature controller 21 and an output power controller 22. Here, in order to avoid vacuum leakage, the thermocouples (T14, T15) and the wires of the heater 19 are led to the outside via the terminal connection flange 23 that can maintain a vacuum. The thermocouples (T14, T15) are connected to the data processing apparatus 100 and monitored.

  Further, the structure of the stirrer driving device 13 is a motor structure as shown in FIG. 3A, which is a detailed view of part A. The stirrer shaft 24 is received by a bearing 25, and the stirrer shaft 24 and the rotor coil 26 are connected to each other. The integrated unit is driven by an external coil 27 and the rotor coil 25 is separated by a stainless steel wall 28. The mounting flanges 29 and 30 are sealed with an O-ring 31 in order to avoid vacuum leakage. Since the structure of the mixing / degassing apparatus 1 uses a resin, it must be structured so that it can be disassembled and cleaned and can maintain a vacuum state. That is, the stirring resin reservoir 12 needs to be taken out and cleaned.

  Therefore, the resin injection part structure to the outside is the structure shown in the B part detailed view of FIG. 3-2. That is, the resin injection pipe 32 to the outside is welded to the bottom of the agitating resin reservoir 12, passes through the heat insulating material 33, passes through the nozzle pipe 34 welded to the vacuum / pressure container 11, and is drawn to the outside. A screw joint 35 is attached to the tip. At the tip of the nozzle tube 34, a vacuum holding mechanism comprising a recessed part 37 that accommodates the O-ring 36, an O-ring holding part 38, and a screw-in cap 39 is installed, and the outer surface of the resin injection pipe 32 is covered by the internal O-ring 36. Seal. This facilitates maintenance of a vacuum state and disassembly / assembly. A resin injection valve IV-3 is provided at a screw joint 35 at the tip of the resin injection pipe 32, and a drain valve DV-1 is provided in the vicinity of the upstream side thereof.

  The drain valve DV-1 has three roles. The first is the discharge of the unmixed resin in the resin injection tube 32, the second is the sampling for checking the viscosity of the mixed resin, and the third is the stirred resin reservoir. The resin remaining in the container 12 is discharged. That is, the drain valve DV-1 can prevent the unmixed resin from flowing into the Dutch oven type resin impregnated containers 7a and 7b. 7b, and the resin remaining in the stirring resin reservoir 12 can be discharged, so that the stirring resin reservoir 12 can be easily cleaned.

  By adopting such a structure of the mixing / degassing device 1, the steps from resin mixing to vacuum degassing can be performed smoothly, and the time can be shortened.

  FIG. 4 shows the transition of the resin mixing / degassing process by the mixing / degassing apparatus 1. Here, the horizontal axis represents the elapsed time since the respective resin agents were injected from the resin main agent injection system 15 and the resin hardener injection system 16 provided in the upper part of the mixing / degassing apparatus 1. The vertical axis represents the pressure in the vacuum / pressure vessel 11, the resin temperature, the resin viscosity, and the resin liquid level in the stirred resin reservoir 12.

  In the resin mixing / degassing step by the mixing / degassing apparatus 1 of the present invention, first, the vacuum / pressurized vessel 11 is evacuated until it reaches P1 which is the degassing pressure. Thereafter, a resin agent (main agent, curing agent) for the amount of resin to be used is injected into the vacuum / pressurized vessel 11 from the resin main agent injection system 15 and the resin curing agent injection system 16 and mixed by the stirrer 13. At this time, the temperature of the resin is controlled to the impregnation temperature injected into the coil. In this state, mixing and vacuum stirring and deaeration are performed, but the first vacuum stirring and degassing is finished by observing the resin state from the observation window 14 on the upper part of the vacuum / pressure vessel 11 and confirming that there is no rise in voids. To do. After that, once the pressure is brought to atmospheric pressure with dry air, the drain valve DV-1 provided in the vicinity of the upstream side of the resin injection valve IV-3 of the resin injection pipe 32 is opened and exists in the resin injection pipe 32. After throwing out the mixed degassed resin outside, check the resin viscosity. When this operation is completed, vacuuming is performed again until the deaeration pressure reaches P1. In addition, there is almost no re-dissolution of the gas by making a pressure into an atmospheric pressure state with dry air. Then, 2nd stirring deaeration is performed. The resin state is observed from the observation window 14 on the upper part of the vacuum / pressurized container 11, and it is confirmed that there is no rise in the void, and the end of the second stirring deaeration is determined. Degassing is completed by the above steps. The resin is injected into the Dutch oven type resin impregnated containers 7a and 7b in a state where the degree of vacuum is slightly reduced to P2 pressure.

  The reason why the degree of vacuum is slightly reduced to the P2 pressure will be described with reference to FIG. The resin contains volatile components of the solvent and moisture, and in a vacuum, they evaporate and form voids. FIG. 5 shows a precipitation boundary curve of dissolved gas. When the resin degassing injection temperature is point a, the dissolved gas precipitation boundary pressure is point b. If the resin is degassed at a vacuum level indicated by point b, voids continue to appear until all the volatile components of the solvent are evaporated, resulting in a change in the curing characteristics of the resin. Therefore, the degassing pressure of the resin is set to P1, which is slightly higher than the precipitation boundary curve of the dissolved gas. The injection pressure of the resin into the Dutch oven type resin impregnated containers 7a and 7b is set to P2, which is slightly higher than the P1 pressure. The pressure in the Dutch oven type resin impregnated containers 7a and 7b at the time of injecting the resin into the coil is equal to the P2 pressure. As a result, generation of voids in the resin during resin impregnation, which is a problem of quenching the superconducting coil, can be avoided.

  Next, the details of the Dutch oven type resin impregnation apparatus 2a into which the resin that has been mixed and degassed by the mixing and degassing apparatus 1 is injected will be described. FIG. 6 shows an overall configuration diagram of the Dutch oven type resin impregnation apparatus 2a.

  The injection resin passes through the branch pipe 40 connected from the resin injection pipe 32 described above, passes through the branch resin injection valve IV-4, the resin injection pipe 41 directly above the container, and is a Dutch oven type resin impregnated container in the thermostat 42. It is poured into the resin reservoir container 43 of 7a. Here, the drain valve DV-2 installed just above the branch resin injection valve IV-4 injects a specified amount of resin into the resin reservoir 43 and then drains the resin accumulated in the pipe upstream of the branch resin injection valve IV-4. To do. Thereby, the piping upstream of the branch resin injection valve IV-4 can be disassembled and washed before the resin hardens.

  In addition to the resin injection system, a gas system 44 as a vacuum / pressurization system is connected to the upper part of the Dutch oven type resin impregnation container 7a via a pressure gauge PB-4.

First, the structure of the thermostatic bath 42 for heating and keeping the temperature of the Dutch oven type resin impregnation container 7a will be described with reference to FIG. The thermostatic chamber 42 is provided with four outer walls 48 that open in the center of the column 47 so as to surround a heat insulating material 46 spread on a circular base 45. Further, a lid 49 is installed on the upper part. The base 45 is provided with a heat insulating material 50 for placing the coil body. On these circular base 45, outer wall 48, and lid 49, a heater 51 is installed via a heat insulating material. The heater 51 heats the Dutch oven type resin impregnated container 7a housed in the thermostat 42, and is installed outside based on signals from thermocouple thermometers (T12 to T14, etc.) installed on the respective walls. Temperature controller (TC)
21, controlled by an output power controller (LC) 22. Note that a camera 52 and a monitor 80 for monitoring the inside of the Dutch oven type resin impregnated container 7 a housed in the thermostat 42 are installed on the thermostat 42. The inside size of the thermostatic chamber 42 is slightly larger than the Dutch oven type resin impregnated container 7a to be stored. This is to increase the thermal efficiency of the heater heating and improve the economic efficiency.

FIG. 6B shows a state when the thermostat 42 is disassembled. As shown in FIG. 6B, the thermostatic chamber 42 can be disassembled when the Dutch oven type resin impregnation container 7a is installed and taken out. Here, a car 53 for reducing the force when the double door is opened is installed on the four outer walls 48 which open the double door at the center of the support 47, and can be easily opened by human power.

  Since the constant temperature bath 42 has the above-described structure, it can be easily disassembled and assembled, so that work efficiency can be improved. Moreover, since it can be made compact, there are effects such as a reduction in heat loss and an increase in thermal efficiency.

  Next, the Dutch oven type resin impregnation container 7a housed in the thermostat 42 and its internal structure will be described with reference to FIG. 6-3. The Dutch oven type resin impregnated container 7 a includes a coil storage container 56 that substantially matches the shape of a coil in which a coil wire 55 is wound around a bobbin 54 and a lid 57 of the coil storage container 56. The coil storage container 56 and the lid 57 are fixed with bolts by sandwiching a Teflon (registered trademark) or silicon packing 58 corresponding to high temperature in a flange form. This avoids leakage due to vacuum and pressure. Here, the lid 57 includes a resin injection pipe 41, a gas system 44 that is a vacuum / pressurization system, a viewing window 59 for observing the inside of the Dutch oven type resin impregnation container 7a, a light extraction window 60, and a hanging tool 61. is set up. The attachment positions of the thermocouples for monitoring the outer surface temperature of each part are T10 at the center part by the lid 57, T9 at the flange part, T8 and T11 at the outer side by the coil storage container 56, and T7 at the bottom part. The attachment position of the thermocouple for monitoring the inner surface temperature of each part is T6 in the center part with the lid 57, T3, T5 inside the side surface with the coil storage container 56, and T4 at the bottom part. These thermometers monitor and control the temperature of the entire Dutch oven type resin impregnation container 7a. In this Dutch oven type resin-impregnated container 7a, one coil having a coil wire 55 wound around a bobbin 54 is accommodated. However, this coil does not directly contact the coil accommodating container 56, but a resin reservoir container constituted by a thin plate. It is in contact with the coil storage container 56 through 43. This is a measure for preventing the resin from directly contacting the coil storage container 56 and solidifying, and the resin is injected into the resin reservoir container 43. Since the resin reservoir container 43 has to be solidified with the coil body and then wired to the hanger 63 and taken out to the outside after being solidified, it is easy to remove a thin tin plate or an adhesion sheet (Teflon (registered) Trademark)). A specified amount of resin 62 is injected into the Dutch oven type resin impregnated container 7a having such a structure in a vacuum state. The specified amount of resin is determined by monitoring the temperature change of the thermocouple thermometers T1 and T2 for monitoring the resin temperature and the observation window 59. The thermocouple thermometers T1 and T2 are located in the vicinity of the upper liquid level even when the resin is solidified, so that the solidified resin can be crushed and removed before the coil body is carried out to the outside.

  By making the Dutch oven type resin impregnated container 7a and the internal structure thereof as described above, the difference in volume between the internal volume of the Dutch oven type resin impregnated container 7a and the coil body impregnated with the resin is reduced. The amount can be reduced. Furthermore, since the volume is small, the heat capacity is reduced and the thermal efficiency is improved. Accordingly, the volume is 1.5 times or less of the coil volume. Moreover, since the inside of the Dutch oven type resin impregnation container 7a is not soiled by injecting the resin into the resin reservoir container 43, maintenance is easy. Furthermore, the assembly type is advantageous in that it can be easily disassembled, temperature, pressure, and internal observation by visual observation, so that the state can be best understood.

FIG. 7 shows a detailed cross-sectional view of the coil body housed in the resin reservoir container 43. Here, reference numeral 41 is a resin injection tube, 54 is a coil bobbin, 55 is a coil wire, 64 is a lower spacer, 65 is a resin injection port of the lower spacer, 66 is an upper spacer, and 67 is a resin of the upper spacer. An inlet / void outlet groove 68, a release sheet 68 used as a boundary between the resin in the coil and the resin outside the coil, and 69, a void generated in the coil.

  FIG. 7 shows that the resin 62 injected from the resin injection tube 41 reaches the specified liquid level, the resin fills the coil, and the void 69 in the coil to which pressure vibration (described later) is applied is discharged out of the coil. It shows how it is done.

  The coil body according to the present invention is characterized by the groove 67 structure of the upper spacer 66 that also serves as the resin injection port and the void discharge port 67. The structure is such that a groove is cut so that the outer side (outer peripheral side) is higher than the inner side (inner peripheral side) of the coil, and the minute voids 69 accumulated on the upper part of the coil are easily discharged by buoyancy.

  FIG. 7-1 shows the structure of the upper spacer 66 made of FRP. As shown in FIG. 7A, the number of grooves 67 provided in the upper spacer 66 can be the same as the number of grooves 65 that are resin injection ports provided in the lower spacer 64. The grooves 65 and 67 are also resin injection ports, and the greater the number of grooves 65 and 67, the shorter the resin impregnation time for the coil. Considering the resin gelation time, it is desirable that the number of grooves (resin inlets) 65 and 67 is larger. In this embodiment, the groove is cut so that the outside is higher than the inside of the coil. However, the same effect can be obtained by cutting the groove so that the outside of the coil is higher than the inside.

  Next, the resin impregnation time in the coil will be described. In order to determine the process after completion of resin impregnation, it is most important to grasp the resin impregnation time in the coil. If the resin impregnation time is unknown, the start time of heating, which is a resin curing process, becomes inaccurate, and an unimpregnated region is created in the coil.

The prediction method according to the present invention will be described below with respect to the resin impregnation time which is the most important for resin impregnation. First, the resin flow situation in the closely wound coil will be described with reference to FIG. At the time of resin impregnation, the resin 62 flows in from the grooves 65 and 67 of the upper and lower spacers as indicated by arrows 73-0 to 73-2, and flows through the narrow flow path 70 (see FIG. 8-1) in the stacked coil. The entire coil is impregnated. The resin is sequentially impregnated in the oblique direction as indicated by the thick dotted arrow 71 from the coil angle. Here, the flow path 70 closest to the four corners to be impregnated first is defined as the first circumference, and is impregnated sequentially as indicated by a thin dotted line 72, and the coil center portion becomes the final circumference. As for the flow of this peripheral circuit, for example, the resin peripheral circuit entered from the arrow 73-1 flows in the direction of the arrow 73-2, and the distance is half of that. The peripheral circuit indicated by the dotted line 72 is a parallel flow path even if there are many flow paths 70, and the pressure loss is equivalent to one flow path. The flow rate Q flowing into the flow path can be derived from the newly invented equation (2) based on the in-pipe laminar friction loss equation (1).

ΔP = 64 / Re × L / D × (ρV 2 / 2g) ... (1)
Q = {√ (1 / (64 / Re × L / (D × α) × 1/2 g × ρ / ΔP)) × A} × β (2)
ΔP: pressure loss of the flow path, Re: Reynolds number, L: flow path length, D: flow path diameter (equivalent diameter), ρ: fluid density, V: flow velocity, g: acceleration of gravity, A: flow path area, β: Number of coil inlets, α: Equivalent diameter correction coefficient that changes depending on winding tension Here, the coil diameter is changed when the coil diameter r is different even if the winding diameter F0 is the same as the winding diameter F0. Therefore, the flow path diameter D needs to be corrected. Formula (3) shows the relationship between the coil radius r and the pressing force Fr of the coil wire (see FIG. 9).

Fr∝1 / r (3)
In FIG. 10, the difference of the flow path 70 between wires when the pressing force Fr of a coil wire differs in a stacked coil is shown. When the pressing force Fr is large, the space between the coil wires opens to the two below, and the flow resistance of the flow path 70 between the wires becomes small. Therefore, it is necessary to correct the flow path diameter D to be larger. When the pressing force Fr is medium, the coil wires are in close contact with each other, and the flow resistance of the flow path 70 between the wires is increased. Even in this case, it is necessary to correct the flow path diameter D to be smaller than the flow path diameter D obtained based on the design dimensions. When the pressing force Fr is small, the space between the coil wires becomes loose, the flow resistance of the inter-line flow path 70 becomes medium, and the flow path diameter D needs to be corrected to be large. Since the flow path diameter D varies depending on the difference in the pressing force Fr as described above, the relationship between the pressing force Fr and the correction coefficient (α) is compiled into a database and used in the calculation for calculating the resin impregnation time.

  (2) Calculate the resin inflow amount Q in the resin impregnated state that changes from time to time using the equation, and determine that the resin impregnation is completed when the integrated value of the resin inflow amount Q is equal to the resin impregnation volume of the coil. The resin impregnation time is defined as the resin impregnation time.

  Next, a verification test of the resin impregnation time prediction method will be described. FIG. 11 shows the shape of a simulated coil that is a test body. FIG. 12 shows the verification test result of the resin impregnation time prediction method. The shape of the simulated coil as the test body was a radius of 150 and a simulated coil wire of 765 turns, and the resin inlet grooves were provided at 24 locations at equal intervals in the lower part of the coil. Water was used as a simulated resin. All test specimens were made of transparent acrylic, the internal resin impregnation state was monitored, and the time when all the impregnations were measured was measured.

  The visual observation during the test will be described below. In the test, in a vacuum state, water that is a simulated resin is injected and held at a constant water level H that is a parameter. Water, which is a simulated resin, flows from 24 grooves provided at equal intervals in the lower part of the coil and enters the coil. The impregnation into the coil wire gap is impregnated from the two lower corners as indicated by the dotted arrows in the figure, and is completed at the upper central portion.

  In FIG. 12, the horizontal axis represents the water head (H) from the coil center to the water surface, and the vertical axis represents the time until the coil is filled with water. The scale on the vertical and horizontal axes is logarithmic. From this result, it can be seen that the predicted value (a) in the resin impregnation time prediction method and the test result (b) are in good agreement, and the prediction method correctly evaluates. Therefore, it can sufficiently be used as a method for predicting the impregnation time in the coil with the actual resin. The resin impregnation time is a base of the resin impregnation step. If the resin impregnation time is known, a resin impregnation step consistent with the temperature and pressure control of the resin can be assembled.

  FIG. 13 shows a voidless resin impregnation method performed under the resin-impregnated coil mass production apparatus according to the present invention. The resin impregnation procedure in the resin impregnation method of the present invention is different from the resin impregnation procedure according to the prior art (VIP method).

The resin impregnation procedure by the prior art (VIP method) is “resin vacuum degassing → vacuum impregnation (resin impregnation completion) → pressure impregnation (volume reduction of residual voids in the coil) → curing”. In the prior art (VIP method), since resin impregnation is performed in a vacuum state, dissolved gas and volatile fluid in the resin are precipitated and evaporated, and the risk of void generation is high. Furthermore, there is a problem that the resin impregnation time is unknown. In consideration of the resin gelation time, resin impregnation of coils with small electromagnetic force that is less affected by the presence of voids and small pressure loss in the coil with a small coil diameter that completes resin impregnation in a short time. The VIP method is effective for application. However, as a resin impregnation method for a coil having a large coil diameter, a large pressure loss in the coil, and a large electromagnetic force,
The VIP method is unsuitable for the relationship between the resin gelation time and the resin impregnation time and the risk of voids. Therefore, a new resin impregnation method is required.

  On the other hand, the resin impregnation procedure by the resin impregnation method according to the present invention is “resin vacuum degassing → coil impregnation container resin injection (until the resin immerses the coil) → pressure impregnation → pressure vibration addition → curing”.

  That is, the resin impregnation method according to the present invention is a resin impregnation method suitable for a coil having a large coil diameter, a large pressure loss in the coil, and a large electromagnetic force. It is mainly composed of pressure impregnation capable of impregnation.

  The resin impregnation procedure by the resin impregnation method according to the present invention will be described with reference to FIG.

  As preparation for resin impregnation into the coil, first, the coil temperature is once increased to the maximum temperature which is the curing temperature, and vacuum deaeration is sufficiently performed, and then the resin impregnation temperature is set for standby. The resin is sufficiently degassed with a degassing device at the impregnation temperature so that no voids are generated. When the degassing of the resin by the degassing device and the degassing of the empty coil are completed, the resin is injected. First, the pressure of the deaerator 1 and the pressure of the Dutch oven type resin impregnated container 7a are set to the same pressure, and the resin is injected from the deaerator 1 into the resin reservoir container 43 of the Dutch oven type resin impregnated container 7a. This injection time is indicated by point a in FIG. The pressure in the resin reservoir container 43 at the point a is slightly lower than the vacuum deaeration by the deaerator, so that no void is generated from the resin in the resin reservoir container 43. In this state, the liquid level of the injected resin is rapidly raised to a fixed position above the coil.

  In the present invention, the vacuum impregnation is performed during this process. However, when the pressure loss in the coil is large as in the case of a closely wound coil, the amount of resin impregnation in the coil is extremely small. shorten.

  In a closely wound coil, it takes a long time to impregnate the coil only by vacuum impregnation as in the conventional VIP method. Therefore, it becomes difficult for the resin to flow into the coil due to gelation of the injected resin, and an unimpregnated region is generated. In the present invention, in order to avoid the occurrence of the unimpregnated region, when the resin liquid level reaches a fixed position on the upper part of the coil, the inside of the Dutch oven type resin impregnated container 7a is pressurized with quick dry air and pressurized to a specified pressure. A method mainly using impregnation was adopted. In the pressure impregnation, the pressure in the non-impregnated region in the coil is almost kept at the vacuum pressure, so that the resin can be impregnated at a high speed by press-fitting. Therefore, the resin impregnation of the coil can be completed before the resin gelation starts.

  The time to complete the impregnation is known in advance by the fat impregnation time prediction method, and it is not clear whether or not the impregnation is completed as in the prior art, and instead of moving to the next step in a groping state, it is smooth. It is possible to shift to a process after completion of impregnation.

  However, there is a possibility that a void 69 having a slightly lower degree of vacuum remains on the upper part of the coil. As an operation for discharging the residual void 69, after the resin impregnation is completed, the pressurized air is once lowered to the atmospheric pressure, further reduced in pressure, and subjected to a void evacuation operation by applying a pressure vibration that repeats the atmospheric pressure and the reduced pressure state. As a result, the void remaining in the upper part of the coil is discharged out of the coil. The spacer 66 at the top of the coil is provided with an oblique groove so that voids can be easily discharged.

  After the void ejection operation is completed, the pressure is increased again to the specified pressure, and the process proceeds to the resin curing process. In the thermosetting resin curing step, pressure vibration is applied to increase the resin temperature in the coil to the primary curing temperature after completion of the void ejection operation, and then the temperature is increased to the secondary curing temperature to completely cure the resin. Thereafter, the temperature and pressure are lowered, the coil is taken out from the Dutch oven type resin impregnation container 7a at room temperature and atmospheric pressure, and the excess resin adhering around the coil is removed, and the resin impregnation process of the coil is completed.

By applying the above resin impregnation method and resin impregnation apparatus, there are the following advantages.
1) By controlling the degassing pressure and impregnation pressure of the resin, it is possible to avoid generation of voids which are dissolved gas and evaporated gas from the resin.
2) By mainly applying pressure impregnation, and further establishing a resin impregnation time prediction method, generation of an unimpregnated region can be avoided and a resin impregnation step can be determined.
3) The number of resin injection ports can be optimized by establishing a resin impregnation time prediction method.
4) As countermeasures against void discharge, the coil structure is provided with an inclined groove in the upper spacer, and by applying pressure vibration that repeats atmospheric pressure and reduced pressure in the pressurization process during resin impregnation, it is thoroughly reduced. Voids generated at a vacuum level can be discharged, and residual voids can be eliminated.

  A quenchless superconducting coil can be completed by the mass production apparatus for resin-impregnated coil according to the present invention and the voidless resin impregnation method of the superconducting coil.

The whole block diagram of the resin impregnation coil device by the present invention. The relationship figure of the resin temperature and resin viscosity in a resin impregnation process. The whole structure of the resin deaeration apparatus by this invention. The motor side detailed drawing of the vacuum holding stirrer by this invention. FIG. 3 is a detailed view of a structure for holding a resin injection part vacuum outside the deaeration device according to the present invention. FIG. 4 is a process diagram for mixing and degassing a resin according to the present invention. FIG. 4 is a relationship diagram of resin vacuum injection pressure and vacuum stirring deaeration according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram of the Dutch oven type resin impregnation apparatus by this invention. 1 is a structural diagram of a constant temperature bath for heating and keeping warm of a Dutch oven type resin impregnated container according to the present invention. The decomposition | disassembly state figure of the thermostat for heating and heat insulation of the Dutch oven type resin impregnation container by this invention. The Dutch oven type resin impregnation container by this invention and its internal structure figure. The detailed sectional view of the coil main part stored in the resin reservoir according to the present invention. FIG. 3 is a structural diagram of an FRP upper spacer according to the present invention. The resin flow condition instruction | indication figure in the closely wound coil by this invention. Narrow flow path instruction diagram in the stacking coil. The relationship figure of coil radius r and pressing force Fr of a coil wire. The figure showing the difference of the flow path between lines in case the pressing force Fr of a coil wire differs. The shape figure of the simulation coil which is a test body. The relationship between the impregnation time prediction value and the test result of the simulated coil according to the present invention. The resin impregnation procedure figure by the resin impregnation method by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mixing and deaeration apparatus, 2a, 2b ... Dutch oven type resin impregnation apparatus, 3 ... Vacuum piping system, 4 ... Pressure piping system, 5 ... Vacuum pump, 6 ... Vacuum container, 7a, 7b ... Dutch oven type resin impregnation container , 8 ... High-pressure dry air cylinder, 9, 19, 51 ... Heater, 10, 20, Tn ... Thermocouple thermometer, 11 ... Vacuum / pressurized vessel, 12 ... Stirring resin reservoir, 13 ... Stirring device drive device, 14, 59 ... Viewing window, 15 ... Resin main agent injection system, 16 ... Resin hardener injection system, 17 ... Bourdon tube pressure gauge, 18 ... Stirrer blade, 21, TC ... Temperature controller, 22, LC ... Output power Controller, 23 ... Terminal connection flange, 24 ... Stirring shaft, 25 ... Bearing, 26 ... Rotor coil, 27 ... External coil, 28 ... Stainless steel wall, 29, 30 ... Mounting flange, 31, 36 ... O-ring, 32 Resin injection pipe, 33 ... Insulating material, 34 ... Nozzle pipe, 35 ... Screwed joint, 37 ... Recessed part, 38 ... O-ring holding part, 39 ... Screwed cap, 40 ... Branch pipe, 41 ... Resin injection pipe just above the container, 42 ... constant temperature bath, 43 ... resin reservoir, 44 ... gas system, 45 ... foundation, 46 ... heat insulator, 47 ... strut, 48 ... outer wall, 49, 57 ... lid, 50 ... thermal insulation, 52 ... camera, 53 ... Car, 54 ... Bobbin, 55 ... Coil wire, 56 ... Coil storage container, 58 ... Packing, 60 ... Light extraction window, 61, 63 ... Hanger, 62 ... Resin, 64 ... Lower spacer, 65 ... Lower spacer inlet , 66 ... upper spacer, 67 ... upper spacer inlet / void discharge groove, 68 ... release sheet, 69 ... void, 73-0 to 73-2 ... arrow, 70 ... flow path in coil, 71 ... dotted arrow, 72 ... thin dotted line, 80 ... Niter, 100 ... Data processing device, PB-n ... Bourdon tube pressure gauge (with negative pressure display), VG-n ... Vacuum gauge, PG ... Strain-type pressure gauge, VV-n ... Vacuum system valve, PV-n ... Additive Pressure system valve, IV-n: resin injection system valve, DV-n: drain valve, AV-n: air release valve.

Claims (10)

A resin impregnation method for a superconducting coil in which an annular superconducting coil is housed in a housing container having an annular housing portion, and then a resin is injected into the housing portion to impregnate the superconducting coil with resin.
The upper surface of the storage part has a groove inclined with respect to a horizontal plane,
A resin impregnation method for a superconducting coil, wherein after the injection of the resin into the storage portion is completed, pressure vibration is applied to the resin in the storage portion.   2. The resin impregnation method for a superconducting coil according to claim 1, wherein after the injection of the resin into the storage part is completed, the resin in the superconducting coil is impregnated by pressurizing the resin in the storage part. A method of impregnating a superconducting coil with a resin.   3. The resin impregnation method for a superconducting coil according to claim 1 or 2, wherein the groove is formed such that the height from the horizontal plane increases from the inner peripheral side to the outer peripheral side of the storage portion. And a resin impregnation method for a superconducting coil.   4. The resin impregnation method for a superconducting coil according to claim 1, wherein the pressure vibration is applied while the resin is pressurized.   5. The method of impregnating a superconducting coil according to claim 1, wherein the degree of vacuum when the resin is deaerated before the resin is injected into the storage portion and the resin is injected into the storage portion is A method of impregnating a superconducting coil with a resin, which is lower than the degree of vacuum when degassing the resin.   6. The method for impregnating a superconducting coil according to claim 1, wherein the storage container has a discharge port for discharging a void generated in the storage unit to the outside of the storage unit, and the discharge port is in the storage unit. And a resin impregnation method for a superconducting coil, which also serves as an injection flow path for injecting the resin into the substrate. 7. The resin impregnation method for a superconducting coil according to claim 1, wherein the resin is injected into the storage portion via an injection flow path, and the inflow flow rate Q of the resin into the storage portion defined by the following formula. A resin impregnation method for a superconducting coil, wherein the resin impregnation time of the superconducting coil is predicted.
Resin inflow rate Q = {√ (1 / (64 / Re × L / (D × α) × 1/2 g × ρ / ΔP))
× A} × β
(Where, ΔP: pressure loss of the flow path, Re: Reynolds number, L: length of the flow path, D: diameter of the flow path (equivalent diameter), ρ: fluid (resin) density, V: flow velocity, g: gravity Acceleration: A: channel area, β: number of channels, α: correction coefficient of channel diameter (equivalent diameter) depending on winding tension.   8. The resin impregnation method for a superconducting coil according to claim 7, wherein the time when the integrated value of the resin inflow amount Q reaches the amount of resin to be immersed in the superconducting coil is defined as the resin impregnation time of the superconducting coil. To impregnate superconducting coil with resin. A resin impregnation method for a superconducting coil in which an annular superconducting coil is housed in a housing container having an annular housing portion, and then a resin is injected into the housing portion to impregnate the superconducting coil with resin.
The resin is injected into the storage portion through an injection flow path, and the resin impregnation time of the superconducting coil is predicted from the flow rate Q of the resin into the storage portion defined by the following equation. Resin impregnation method for superconducting coils.
Resin inflow rate Q = {√ (1 / (64 / Re × L / (D × α) × 1/2 g × ρ / ΔP))
× A} × β
(Where, ΔP: pressure loss of the flow path, Re: Reynolds number, L: length of the flow path, D: diameter of the flow path (equivalent diameter), ρ: fluid (resin) density, V: flow velocity, g: gravity Acceleration: A: channel area, β: number of channels, α: correction coefficient of channel diameter (equivalent diameter) depending on winding tension. 10. The resin impregnation method for a superconducting coil according to claim 9, wherein the time when the integrated value of the resin inflow amount Q reaches the amount of resin to be immersed in the superconducting coil is defined as the resin impregnation time of the superconducting coil. To impregnate superconducting coil with resin.

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