JP2007234692A - Resin impregnation method for superconducting coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin impregnation method for a superconducting coil which can suppress the generation of voids remaining in a superconducting coil when the superconducting coil is impregnated with resin. <P>SOLUTION: A resin is injected into a circular housing container housing a circular supeconducting coil from the inside of the lower part of the container (or the outside thereof), and the liquid level of the resin in the housing container is advanced toward an outlet which is provided on the outside of the upper part of the housing container (or the inside of the upper part of the housing container) to discharge gas remaining in the housing container. Since the liquid level of the resin in the housing container is advanced toward the outlet which is provided on the outside of the upper part of the housing container to discharge gas remaining in the housing container; the generation of voids remaining in the superconducting coil can be suppressed when the superconducting coil is impregnated with resin, and a high-performance quenchless coil can be formed. <P>COPYRIGHT: (C)2007,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.

  In order to increase the resolution of the MRI apparatus, it is necessary to achieve a high magnetic field. For this purpose, it is necessary to use a closely wound coil. When a densely wound coil is used, the gap between the coil wires becomes very narrow, and the remaining voids during resin impregnation become a problem.

In the resin impregnation of the superconducting coil, a vacuum / pressure impregnation method (hereinafter referred to as “VIP method”) is adopted as a general method in order to minimize residual voids in the coil (for example, patent literature). 1 and Patent Document 2). Patent Document 1 describes the VIP method as a resin impregnation method for a coil composed of a Nb ₃ Sn superconducting wire covered with glass fiber. Patent Document 2 describes a VIP method as a resin impregnation method for a superconducting coil having a large amount of insulating layers.

  In the vacuum impregnation in the VIP method, mixing of the gas into the coil is suppressed by impregnating the coil with resin in a vacuum. However, since an absolute vacuum cannot be achieved, some gas may remain in the coil. Further, in the pressure impregnation, the resin is supplied to a portion that cannot be impregnated by vacuum impregnation. Furthermore, the volume of residual voids can be reduced by pressure impregnation.

Japanese Patent Laid-Open No. 11-154607 JP 2001-189226 A

  For example, when an Nb-Ti superconducting material is covered with a copper material and a superconducting wire covered with an epoxy resin as an insulating material is tightly wound on a bobbin, the densely wound coil is Since the gap between the coil wires is very narrow, if a void is generated, it becomes difficult to escape the void. When electromagnetic force acts, stress concentrates on the void, and resin cracks occur starting from the void. When a resin crack occurs, the energy causes a quench phenomenon that transitions from superconducting to normal conducting. Therefore, in order to avoid the quench phenomenon, it is important not to cause the voids in the superconducting coil to remain.

  An object of the present invention is to provide a resin impregnation method for a superconducting coil that can suppress the occurrence of voids in the superconducting coil when the superconducting coil is impregnated with resin.

  From the inner side of the lower part of the annular storage container (or the outer side of the lower part of the storage container) containing the annular superconducting coil, the outer side of the upper part of the storage container for injecting resin into the storage container and discharging the residual gas in the storage container ( Or, the liquid level of the resin in the storage container is advanced toward the discharge port installed in the upper part of the storage container.

  According to the present invention, the resin is applied to the superconducting coil in order to advance the liquid level of the resin in the storage container toward the discharge port installed outside the storage container upper part for discharging the residual gas in the storage container. When impregnated, generation of residual voids in the superconducting coil can be suppressed, and a high-performance quenchless coil can be formed.

  Embodiments of the present invention will be described below. In the resin impregnation method of the superconducting coil according to the embodiment of the present invention, the resin is injected from the lower part inside the coil (that is, the bobbin side), and the rise in the liquid level of the injected resin is at the farthest position from the inside of the coil. It should be inclined toward the upper part of the outside of a certain coil. Further, a bubble reservoir is installed on the upper part outside the coil. The final reaching position of the slanting liquid level is set in the bubble reservoir installed in the upper part outside the coil.

  The bubble reservoir tube during resin impregnation is evacuated and the vacuum state is maintained. The upper spacer of the coil is provided with a groove from the center of the coil toward the bubble reservoir, so that residual gas can easily collect in the bubble reservoir. Furthermore, in order to allow residual gas in the coil to escape upward (in the direction of the bubble reservoir), the corners of the spacer portion (the upper portion inside the coil) that is the coil internal frame are processed obliquely. In addition, by processing the corners of the spacer portion obliquely, it also serves to eliminate a portion having a large gap in the coil wire where voids tend to accumulate. With such a structure, the residual gas in the coil can be discharged during the resin impregnation process in the coil.

  A contact-type liquid level gauge or thermoelectric thermometer may be installed in the bubble reservoir installed at the top of the coil, and it may be determined whether the coil is filled with resin based on the change in the signal. In response to a signal change from the contact-type liquid level gauge or thermoelectric thermometer, a resin curing operation (resin temperature rise) is performed as the next step. Prior to the resin curing operation, it can be avoided that the coil is not impregnated by checking whether or not the coil is filled with the resin by using a contact-type liquid level meter or a thermoelectric thermometer.

Further, when the resin temperature is raised in the resin curing operation, the temperature of the resin may be controlled by energizing and heating the coil itself. The temperature of the resin is derived based on a change in resistance (R _t ) of the coil. Specifically, the applied voltage (V) and current (I) to the coil are measured and derived from the following equations.

R _t = V / I (1)
R _t = R _s {1 + α _s (T ₂ −T _s )} (2)
here,
R _s : resistance at reference temperature (Ω)
α _s : temperature coefficient of resistance (0.00043 at 20 ° C of copper)
T _s : Reference temperature T ₂ : Temperature of coil wire (corresponding to internal resin temperature)
It is.

  That is, the coil temperature during energization of the coil can be obtained from the above two equations. Based on the obtained coil temperature, the voltage applied to the coil is controlled to manage the temperature in the coil. In this embodiment, in order to increase the temperature of the entire resin, temperature management is performed with another heater. That is, the temperature control by energizing the coil is used to make the temperature in the coil uniform.

  When the resin temperature is raised in the resin curing operation, the inside of the coil can be uniformly cured by making the temperature inside the coil uniform by energizing and heating the coil itself. Therefore, it is possible to avoid the formation of a space inside the impregnating resin that occurs due to heat shrinkage.

  Next, the resin impregnation method of the superconducting coil in the present invention will be specifically described with reference to the drawings.

  A first embodiment relating to a resin impregnation method for a superconducting coil according to the present invention will be described with reference to FIGS. In this embodiment, when the superconducting coil is impregnated with resin, the resin is injected into the storage container from the inside (or outside the bottom of the storage container) of the annular storage container containing the annular superconducting coil. Residue of voids in the superconducting coil by advancing the liquid level of the resin in the storage container toward the discharge port installed outside the storage container upper part (or inside the storage container upper part) for discharging residual gas It suppresses generation | occurrence | production of this.

  The apparatus used for the resin impregnation method of the superconducting coil in the first embodiment will be described. FIG. 1 is an overall configuration diagram of a coil resin impregnation apparatus in the first embodiment. FIG. 2 is a structural diagram of the resin-impregnated coil in the first embodiment. The resin impregnation method in this example is autoclave molding by the VIP method. First, the superconducting coil 1 to be impregnated with resin is installed in a resin reservoir 3 installed in an autoclave container 2. A resin injection system 4 for injecting the resin into the resin reservoir 3 is connected to the bottom of the resin reservoir 3. Further, a thermometer (T1) for measuring the temperature of the resin and a heater 5 for heating the resin are installed. A vacuum system 6 and a pressurization system 7 are connected to the autoclave container 2, and a pressure gauge (P1) for monitoring the internal pressure is installed.

  The densely wound coil 1 is housed so as to be surrounded by the glass insulating material 10, the FRP upper spacer 11 and the FRP lower spacer 12 installed inside the bobbin 8 and the binder 9. The FRP lower spacer 12 is provided with a groove 15 so that the resin 14 flowing from the gap 13 provided at the lower portion of the binder 9 reaches the bobbin 8 side. A hole 16 for injecting resin into the coil is provided on the bobbin side of the FRP lower spacer 12.

The upper spacer 11 made of FRP above the coil is provided with a groove 17 so that the remaining gas can easily pass therethrough. That is, a hole 18 is provided on the coil upper binder side so as to be connected to the groove 17, and the hole 18 is connected to the bubble reservoir 19. In the bubble reservoir 19, a contact type liquid level gauge (L 1) is installed. The installation position of the liquid level gauge (L1) is adjusted to a position slightly lower than the final resin liquid level 26 of the resin reservoir 3. This level gauge can be installed on all of the bubble reservoirs 19 when a plurality of bubble reservoirs 19 are provided. In FIG. 1, the case where a liquid level gauge is installed in a total of eight places (L1-L8) is shown. A pipe 20 that performs vacuum and pressurization is connected to the upper part of the bubble reservoir 19, and the pipe 20 is connected to a vacuum and pressurization system via valves (V 3 and V 4). Here, the valves (V3, V4) are opened and closed by a signal processor (L _AV ) that centrally manages the signals of the liquid level gauges (L1-L8). The valves (V1, V2) in the vacuum / pressurization system are opened and closed by a liquid level gauge (L9) of the resin reservoir 3.

  The resin injection system 4 connected to the resin reservoir 3 is connected to the upper resin deaerator. The resin degassing apparatus includes a degassing resin reservoir tank 21, a stirrer 22, a resin charging port 23, a vacuum system 24, a resin heating heater 25, a resin charging valve (V5), a resin injection valve (V6), It consists of a pressure gauge (P0), a thermometer (T0), and a liquid level gauge (L0).

  Hereinafter, the resin impregnation method of the superconducting coil in the first embodiment will be described.

  The resin impregnated in the coil 1 is used by mixing a curing agent with an epoxy resin as a main ingredient. After mixing, gelation progresses with time, and thus it is necessary to proceed quickly. Therefore, preparation for resin impregnation into the coil 1 is made before pouring the resin into the resin reservoir 3. Specifically, the coil 1 is installed in the autoclave container 2, electric and piping systems are connected, the heater 5 preheats the resin reservoir container 3 to the resin temperature at the time of impregnation, and a pressurizing valve ( V2 and V3) are closed, evacuation is performed, and the inside of the autoclave container 2 and the coil 1 is kept in a vacuum state.

  Next, a resin in which a main component of epoxy resin and a curing agent are mixed is put into a degassing resin reservoir tank 21 preheated by a resin heating heater 25, mixed with stirring, and then evacuated from the vacuum system 24. Deaerate. At this time, the vacuum pressure for deaeration is higher than the vacuum in the autoclave container 2 and the coil 1. For example, the pressure at the time of impregnation into the coil 1 can be 7 Pa, and the pressure of the degassing resin reservoir tank 21 can be 5 Pa.

  Degassing will be described in more detail with reference to FIG. FIG. 3 is a saturation curve diagram and is an explanatory diagram of resin degassing pressure and impregnation pressure. In FIG. 3, the horizontal axis indicates the resin temperature, and the vertical axis indicates the pressure. The resin in which the epoxy resin main agent and the curing agent are mixed is in a state where air when stirring and mixing, dissolved gas dissolved in the liquid, moisture, volatile gas, and the like are mixed. It is necessary to eliminate this gaseous component as much as possible. However, if the degree of vacuum is increased too much, the solvent evaporates due to boiling under reduced pressure, so that the mixing ratio does not match and there is a possibility that the strength changes after curing. Accordingly, the degassing pressure (P0) of the degassing resin reservoir tank 21 is set to a position (Y1) close to the saturation curve in the reduced-pressure boiling avoidance region. The vacuum impregnation pressure in the coil 1 and the autoclave container 2 is set to a position (Y2) that is equal to or higher than the internal pressure (P0) of the deaeration tank 21. When the internal pressure (P1) in the coil 1 and the autoclave container 2 is made lower than the internal pressure (P0) in the deaeration tank 21, the dissolved gas is deposited as voids from the resin injected into the resin reservoir container 3 due to the difference pressure, and the coil It is because it will flow into 1. Therefore, the vacuum impregnation pressure in the coil 1 and the autoclave container 2 is set to a position (Y2) that is equal to or higher than the internal pressure (P0) of the deaeration tank 21.

  In this case, since the vacuum impregnation pressure in the coil 1 and the autoclave container 2 is slightly increased, the residual gas remaining in the coil 1 and the autoclave container 2 increases. When resin impregnation is performed in a state where the upper part of the coil is sealed, this residual gas exists as a void in the upper part of the coil 1. Further, in a closely wound coil in a state where the upper part of the coil is hermetically sealed, a glass fiber insulating material may be inserted therein, and the degree of vacuum near the upper part of the coil farther from the resin injection port 13 is slightly lower. Accordingly, a large amount of residual gas exists in the upper part of the coil 1. This causes a quench phenomenon in the superconducting coil. Therefore, it is necessary to take measures to prevent this residual gas from remaining in the coil.

  Next, the operation of injecting the resin, which has been degassed by the resin degassing device, into the resin reservoir 3 and impregnating the coil with the resin will be described with reference to FIG. FIG. 6 shows a change in the resin liquid level in the resin reservoir 3 and a change in the impregnating liquid level in the coil with respect to the elapsed time since the start of the injection of the resin degassed by the resin deaerator into the resin reservoir 3. The pressure change in the coil 1, the pressure change in the autoclave container 2, and the change in the resin temperature in the coil are shown.

  The initial equipment conditions are as follows. That is, the pressure in the autoclave container 2 and the coil 1 is maintained at 7 Pa. The injected resin was adjusted to the initial resin temperature, degassed under 5 Pa conditions, and then maintained at a pressure of 7 Pa. The resin reservoir 3 and the coil 1 are preheated at a temperature equivalent to the initial resin temperature.

  In this apparatus state, the valve (V6) in the resin deaerator is opened, and the resin is injected into the resin reservoir 3. This state is shown at point a in FIG. The liquid level of the resin reservoir 3 rises with time and reaches the full water level. In this state, the coil is immersed in the injected resin, and the drive source for the resin to enter the coil is the height of the resin accumulated in the resin reservoir 3. Since this height is small, in the vacuum impregnation, the flow resistance in the coil is large and the amount of impregnation is small.

  When reaching the point b where the liquid level gauge (L9) of the resin reservoir 3 is activated, the valve (V6) in the resin deaerator is closed to stop the injection of the resin. Then, it shifts to pressure impregnation.

  In the pressure impregnation, the valve (V1) in the vacuum system is closed, the valve (V3) is confirmed to be closed, the valve (V2) in the pressure system is opened, and the pressure in the autoclave container 2 is Increase gradually. When pressure impregnation begins, resin begins to enter the coil 1 and the liquid level in the coil 1 rises. At this time, the pressure in the coil 1 remains at 7 Pa, which is set at the initial stage.

  At the point c where the liquid level in the coil 1 rises and the liquid level gauge (L1-L8) installed in the bubble reservoir 19 operates, the coil is filled with resin and the impregnation is completed. . Here, in this example, the resin is impregnated into the coil by using both vacuum and pressure impregnation, and after the entire space in the coil is filled with the resin, the resin temperature is raised to the curing temperature to solidify the resin. Let At this time, it is important to determine whether or not the inside of the coil is filled with resin. If this determination is ambiguous and the resin temperature is raised to the curing temperature and the resin is solidified, problems such as the occurrence of an unimpregnated area occur. Therefore, in this embodiment, a liquid level gauge (L1-L8) is installed in the bubble reservoir 19 installed on the upper part of the coil so that it can be reliably determined whether or not the inside of the coil is filled with resin. Thereby, when it moves to the resin hardening operation | work which is the next process, an unimpregnated state can be avoided reliably.

  When the point c is reached, since the resin impregnation in the coil 1 has been completed, the pressure of the bubble reservoir 19 system is returned to the autoclave vessel 2 pressure. This closes the vacuum system valve (V4) and opens the pressurization system connection valve (V3). Thereby, the autoclave container 2 pressure and the pressure of the bubble reservoir 19 system become the same pressure. Thus, the resin impregnation into the coil 1 is completed, but the pressure is maintained until the resin is cured.

  In this embodiment, when the superconducting coil is impregnated with resin, the following measures are taken to suppress the occurrence of voids remaining in the superconducting coil.

  First, the bubble reservoir 19 is installed on the upper part of the coil 1 to be impregnated with resin, and the resin is impregnated while the inside thereof is evacuated. That is, the inside of the coil is directly evacuated. Thereby, the residual gas in the coil 1 can be discharged efficiently.

  Further, the resin impregnation process in the coil 1 is controlled. This will be described with reference to FIG. FIG. 4 shows a block diagram of the resin impregnation liquid level control in the coil in the first embodiment. The FRP lower spacer 12 is provided with many grooves 15 so that the resin 14 flowing from the binder lower gap 13 reaches the bobbin side, and the bobbin side is provided with many holes 16 for injecting resin into the coil. It has been. As a result, the resin 14 flowing from the binder lower gap 13 is guided to the bobbin side, and the resin flows into the coil 1 from the lower part of the bobbin side. The resin that has flowed in from the bobbin side (the coil inner side) of the lower part of the coil fills the flow path between the coil wires, forms an oblique liquid level 27 toward the outer side of the upper part of the coil at a position facing the bobbin side of the lower part of the coil. Rises toward the bubble reservoir 19 at the top of the coil on the side (that is, toward the bubble reservoir for discharging residual gas installed outside the upper portion of the resin reservoir, the liquid level of the resin in the resin reservoir is proceed). That is, this obliquely rising liquid level pushes the residual gas obliquely upward, and the inside of the bubble reservoir installed outside the upper part of the coil is the final destination. The bubble reservoir tube during resin impregnation is evacuated and maintained in a vacuum state. As a result, the residual gas is pushed up to the liquid level 27 and guided to the bubble reservoir 19. Regarding the rise of the liquid level in the coil, resin was injected from the outside of the lower part of the coil, and the rise of the injected resin liquid level was installed on the inner side (bobbin side) of the upper part of the coil in a position facing the lower part of the outer side of the coil. It may be inclined toward the bubble reservoir (that is, the resin liquid level in the resin reservoir is directed toward the bubble reservoir for discharging the residual gas installed inside the upper portion of the resin reservoir. You can make it progress.) In this embodiment, the upper part refers to the upper side from the midpoint in the height direction of the resin reservoir, and the lower part refers to the lower side from the midpoint in the height direction of the resin reservoir. Further, the outer side means the outside from the radial intermediate point of the resin reservoir container, and the inner side means the center side from the radial intermediate point of the resin reservoir container.

  Further, a groove 17 toward the bubble reservoir 19 is formed so that the residual gas can easily pass through the FRP upper spacer 11 at the top of the coil. A groove 19 is provided in the upper spacer 11 made of FRP above the coil, and a hole 18 is provided on the coil upper binder side so as to be connected to the groove 17. The hole 18 is connected to the bubble reservoir 19. Residual gas is guided to the bubble reservoir 19 by the grooves 17 and the like.

  Furthermore, as a structure for allowing the residual gas in the coil to escape upward, the corners of the spacer portion serving as the coil inner frame are processed obliquely. In particular, the corner portion of the FRP upper spacer 11 on the upper side of the bobbin 8 where residual gas tends to accumulate is cut obliquely 28. By processing the corners of the spacer portion obliquely, it also serves to eliminate a portion having a large gap in the coil wire where voids tend to accumulate. With such a structure, the gas in the coil can be discharged during the resin impregnation process in the coil. Even when the number of turns of the coil is adjusted to be small, the corner portion of the FRP upper spacer 11 on the upper side of the bobbin 8 is cut diagonally 28 as shown in FIG.

  After the resin impregnation operation into the coil is completed, the resin is cured. This resin is cured by raising the temperature. The temperature of the resin is increased from the point d after the point c, and the resin is hardened by primary curing and secondary curing.

  Here, since the resin to be used is one that is cured by raising the temperature, it is necessary to manage the temperature so that the temperature in the coil is uniform. If the temperature varies in the coil having a large diameter, the cured portion becomes a spotted pattern, which causes a problem of forming a space due to shrinkage inside the resin. Therefore, in this embodiment, curing temperature management is performed by energizing and heating the coil itself. In the temperature management, the temperature is derived based on the resistance change of the coil. Thereby, the temperature in the coil can be managed at a uniform temperature, and the problem of forming a space inside the resin can be avoided because the curing location does not become a spotted pattern.

  The resin temperature is increased by using both the heater 5 for heating the resin in the resin reservoir 3 and the heating by direct energization of the coil 1. This is because it is difficult to manage the temperature in the coil 1 with a large coil. That is, in the case of a coil having a large diameter, only the resin heating heater 5 heated from the outside of the resin reservoir 3 causes a temperature difference in the coil, causing an unbalance of heat shrinkage at the time of curing, and the space inside the impregnated resin. May be formed. By using the heater 5 for resin heating and heating by direct energization to the coil 1 together, the temperature in the coil can be made uniform, and the formation of a space inside the impregnated resin can be avoided. This direct energization is auxiliary to the heater 5 for resin heating and does not require a large output.

  Hereinafter, heating by direct energization of the coil will be described with reference to FIG. FIG. 7 is a diagram for explaining a heating method by direct energization and a method for deriving the temperature in the coil. The Nb—Ti superconducting coil 1 wire is a Nb—Ti superconducting material coated with a copper material, and in normal conduction, it has a resistance of a copper wire. The coil wire is directly energized to warm the coil and indirectly heat the resin. By adopting such direct energization to the coil, the temperature in the coil 1 can be made uniform. When voltage V is applied to the coil and current I is applied, heat is generated by the resistance Rt of the coil wire. The temperature inside the coil is identified by converting a resistance change accompanying a temperature rise into a temperature. This can be derived from the following equation:

R _t = V / I (1)
R _t = R _s {1 + α _s (T ₂ −T _s )} (2)
here,
R _s : resistance at reference temperature (Ω)
α _s : temperature coefficient of resistance (0.00043 at 20 ° C of copper)
T _s : Reference temperature T ₂ : Temperature of coil wire (corresponding to internal resin temperature)
That is, the coil temperature during energization of the coil is found from the above two equations. Based on this temperature, the voltage applied to the coil is controlled to manage the temperature in the coil. However, the temperature of the entire resin is controlled by a separate heater, and the temperature control by energizing the coil is for making the temperature in the coil uniform, and does not increase the temperature of the entire charged resin. By making the temperature inside the coil uniform in this way, the inside of the coil can be uniformly cured, the formation of a space inside the impregnating resin caused by heat shrinkage can be avoided, and the cause of quenching of the superconducting coil can be avoided. be able to.

  The resin curing operation is completed by raising the temperature of the resin by appropriate temperature control and hardening the resin. The bubble reservoir 19 is removed after being impregnated and cured. Further, the resin clogged in the hole 18 on the coil upper binder side to which the bubble reservoir 19 is attached is also removed. This is performed in order to avoid resin cracking in the coil superconducting state.

  With the above operation, a quenchless superconducting coil can be created.

  In this embodiment, the pipe 20 is connected to the upper part of the bubble reservoir 19, but it is also possible to adopt a configuration in which the pipe 20 is not used. The pipe 20 is for individually evacuating the coil 1 and forcibly exhausting residual gas in the coil. In FIG. 8, the block diagram of the resin impregnation coil when not using the piping 20 is shown. In the configuration diagram of the resin-impregnated coil shown in FIG. 8, the pipe 20 is not provided, but the other structure is the same as that of the resin-impregnated coil shown in FIG. By adopting a configuration in which the pipe 20 is not used, the resin impregnation effect is slightly reduced, but an effect such as cost reduction by simplification can be obtained.

  The superconducting coil created by the resin impregnation method of the superconducting coil according to the present embodiment can be applied to a coil using an MRI apparatus or other superconducting material, an insulating coil using a normal conducting material, or the like.

The whole block diagram of the coil resin impregnation apparatus in a 1st Example. The structure figure of the resin impregnation coil in the 1st example. Explanatory drawing of resin degassing pressure and impregnation pressure. The resin impregnation liquid level control block diagram in the coil in a 1st Example. The internal block diagram of the coil turn number adjustment coil in a 1st Example. The figure which shows the change of the resin liquid level of the resin reservoir container in 1st Example, the change of the impregnation liquid level in a coil, the change of the pressure in a coil, the pressure change in an autoclave container, and the resin temperature change in a coil. Explanatory drawing of the heating method by direct electricity supply, and the temperature deriving method in a coil. The structure figure of the simplified resin impregnation coil.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Coil, 2 ... Autoclave container, 3 ... Resin reservoir container, 4 ... Resin injection system, 8 ... Bobbin, 9 ... Binder, 27 ... Diagonal liquid level, 28 ... Spacer angle diagonal cut part.

Claims (8)

From the inside of the lower part of the annular storage container containing the annular superconducting coil, the resin is injected into the storage container,
A resin for a superconducting coil, wherein the resin level in the storage container is advanced toward a discharge port installed outside the upper part of the storage container for discharging residual gas in the storage container. Impregnation method. From the outside of the lower part of the annular storage container containing the annular superconducting coil, the resin is injected into the storage container,
A resin for a superconducting coil, wherein the resin surface in the storage container is advanced toward a discharge port installed inside the upper part of the storage container for discharging residual gas in the storage container. Impregnation method.   3. The method of impregnating a superconducting coil according to claim 1 or 2, wherein the residual gas in the storage container is made to progress by advancing the liquid level of the resin in the storage container toward the discharge port. A method of impregnating a superconducting coil with resin, wherein the superconducting coil is discharged out of the storage container.   4. The method of impregnating a superconducting coil according to claim 1, wherein at least one of the corner portion on the outer side of the upper portion of the storage container and the corner portion on the inner side of the upper portion of the storage container is formed obliquely. A method of impregnating a superconducting coil with a resin. A method of impregnating a superconducting coil according to any one of claims 1 to 4,
After confirming that the storage container is filled with the resin by a level gauge installed in the discharge pipe connected to the discharge port, the resin is increased by raising the temperature of the resin to a curing temperature. A method of impregnating a superconducting coil with a resin, characterized by solidifying. A resin impregnation method for a superconducting coil according to any one of claims 1 to 5,
After the storage container is filled with the resin, the temperature of the resin is raised to a curing temperature to solidify the resin,
A method of impregnating a superconducting coil with resin, wherein the superconducting coil is directly energized when the resin is solidified.   The resin impregnation method for a superconducting coil according to claim 6, wherein when energizing the superconducting coil directly, the temperature of the superconducting coil is derived from the resistance of the superconducting coil, and based on the temperature, A method of impregnating a superconducting coil with resin, wherein the electric power directly applied to the superconducting coil is adjusted. The superconducting coil resin impregnation method according to any one of claims 1 to 7, wherein a vacuum / pressure impregnation method is used when the superconducting coil is impregnated with the resin. Resin impregnation method.

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