JP2007214546A - Manufacturing method of frp cryostat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of FRP cryostats allowing a metal joint that is fitted through the wall surface of the FRP cryostat to be securely fixed, and preventing the generation of vacuum leak due to various stresses. <P>SOLUTION: A metal joint 14 is inserted into the joint insertion hole of a flanged male screw member 15 to be fixed. The flanged male screw member with the metal joint fixed is screwed into a female screw hole that is formed in the wall surface of an FRP container through an adhesive. A flanged female screw member 16 is screwed to the male screw of the flanged male screw member that is projected from the female screw hole. In such a state that the container wall is sandwiched between the flanges of both members, a prepreg is laminated and stacked to cover the flanges and the container wall surface. After that, the prepreg is degassed and cured. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an FRP cryostat, and more specifically, a metal wall such as a pipe or an electrode is formed on a wall made of FRP (fiber reinforced plastic) cryostat for storing a cryogenic fluid such as liquid nitrogen or liquid helium. The present invention relates to a method of fixing a joint in a penetrating state.

A cryostat used for cooling a superconducting magnet or the like cannot be manufactured by integral molding because an object to be cooled such as a superconducting magnet must be placed in the cryostat. In particular, in the case of an FRP cryostat, since it cannot be welded like metal, a bottomed cylindrical container main body serving as the main body of the cryostat, and a plate-like lid member attached to the upper opening of the container main body, These are generally manufactured by bonding them together (see, for example, Patent Document 1). Also, when fitting a metal joint such as an exhaust port or a metal joint to the wall surface of such an FRP cryostat in a penetrating state, the male thread portion of the metal joint is inserted into the female thread hole formed in the FRP member. Generally, screwing is performed through an adhesive.
Japanese Patent Laid-Open No. 61-210603

  Up to now, in the case of a sealed container such as a cryostat, it has been common that the metal joint is attached by screwing from the outside of the container. However, in this case, since the FRP female thread is attached only from the outside, if the mechanical or thermal shock is repeatedly applied to the adhesive part, the adhesive part peels off or cracks occur. There was a risk of doing so. When such peeling or cracking occurs, a vacuum leak occurs, and the atmosphere or the stored liquefied gas leaks into the heat insulating vacuum layer, so that the function as a cryostat may be lost.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a manufacturing method of an FRP cryostat that can securely fix a metal joint that is attached through the wall surface of an FRP cryostat and can prevent the occurrence of vacuum leak due to various stresses. It is said.

  In order to achieve the above object, the FRP cryostat manufacturing method of the present invention is an FRP cryostat manufacturing method in which a metal joint is passed through the wall surface of an FRP container that contains a low-temperature fluid. Female screw hole formed in the wall surface of the FRP container with the flanged male screw member fixed in a sealed state by being inserted into the joint insertion hole of the flanged male screw member having a direction joint insertion hole Screwed to the male threaded portion of the male threaded member projecting from the female threaded hole, and threaded to the male threaded member projecting from the female threaded hole, Then, the prepreg is attached and laminated so as to cover the flange and the container wall surface of the male screw member with the flange, and the flange and the container wall surface of the female screw member with the flange. It is characterized by curing the degassed grayed.

  Furthermore, in the method for manufacturing the FRP cryostat of the present invention, when the metal joint is provided on the curved surface portion of the FRP container, the flange portion of the flanged male screw member or the flange portion of the flanged female screw member is provided on the curved surface portion. Affix the prepreg to the abutting part, stack it, degas and cure the prepreg, and after flattening the buttocks abutment surface, either form the female screw hole or The FRP member having a curved surface corresponding to the curved surface portion and the other surface having a flat surface with which the flange portion of the flanged male screw member or the flange portion of the flanged female screw member abuts is attached. It is characterized by forming a hole.

  According to the FRP cryostat manufacturing method of the present invention, since the container wall is sandwiched between the flanges from both sides, the mounting strength can be improved as compared with the conventional screw-in bonding, and the flange and the container By covering the wall with FRP, the mounting strength can be further improved, and it can withstand mechanical shock and vibration from outside, thermal stress and strain due to repeated cooling, and prevent the occurrence of vacuum leaks. be able to. Moreover, when providing aluminum vapor deposition resin as a heat insulation member on a wall surface, since a collar part and aluminum vapor deposition resin can be insulated by FRP, even when an electrode is penetrated, there is no fear of electric leakage.

  FIG. 1 is a partial cross-sectional front view showing one embodiment of an FRP cryostat manufactured by the method of the present invention. The FRP cryostat 11 is formed by joining a pair of container halves 12 and 13 each having a bottomed cylindrical body, and a pair of container halves 12 serving as the upper half of the cryostat has a pair of Metal electrode joints 14 and 14 are provided in a penetrating state. Each electrode coupling 14 is attached to the wall surface of the cryostat 11 made of FRP using a metal male screw member 15 with a hook and a female screw member 16 with a hook.

  The procedure for attaching the electrode joint 14 to the wall surface of the FRP cryostat 11 will be described below. First, as shown in the cross-sectional front view of FIG. 2, the container half 12 that forms the FRP cryostat 11 is manufactured. The FRP container half 12 can be manufactured in the same manner as a conventional FRP product, and the manufacturing procedure is not particularly limited.

  Next, as shown in the cross-sectional front view of the main part of FIG. 3, a female screw hole 17 is formed at the attachment position of the electrode joint 14 on the wall surface of the container half 12. Further, as shown in the cross-sectional plan view of the main part of FIG. 4, when the wall surface is an arc surface like the FRP cryostat 11 mentioned in this embodiment, the prepreg is previously attached to the attachment position of the electrode joint 12. By sticking and laminating and degassing and curing the prepreg, the FRP seat 18 integrated with the container wall surface is formed, the surface of the FRP seat 18 is planarized, and a male screw member with a flange 15 and a flat portion 18a perpendicular to the axis of the electrode joint 14 is formed in a range including the periphery of the flange contact surface of the female screw member 16 with a flange, and then the female screw hole 17 including the FRP seat portion 18 is formed. Form. Alternatively, an FRP member corresponding to the arcuate surface of the wall surface may be manufactured in advance, and a flat surface portion may be formed by adhering to the wall surface and contacting the collar portion.

  On the other hand, as shown in the front view of FIG. 5, the electrode joint 14 is composed of a rod-like member having male threads 14 a serving as terminals at both ends, and the flanged male thread member 15 includes the electrode joint 14. A joint insertion hole 15a having an inner diameter slightly larger than the outer diameter is provided in the axial direction. After the electrode joint 14 is inserted into the joint insertion hole 15a, the electrode joint 14 and the joint insertion hole 15a are fixed and integrated in a sealed state by fixing means such as welding or brazing.

  A flange portion 15d having a diameter larger than that of the male screw portion 15c is provided at the distal end of the head portion 15b of the flanged male screw member 15, and the distal end surface of the flange portion 15d is processed into a plane orthogonal to the axis. The male screw portion 15c is formed to be sufficiently longer than the wall thickness of the container half body 12, and an engagement surface 15e (see FIG. 9) of the screwing tool is provided on the peripheral surface of the head portion 15b. ing.

  The female screw member 16 with a hook has a female screw part 16a into which the male screw part 15c is screwed, and a hook part 16c similar to the hook part 15d is provided at the tip of the head part 16b. An engagement surface (not shown) of the screwing tool is provided on the peripheral surface. The adhesive surfaces of the male screw member 15 with the flange, the female screw member 16 with the flange, the wall surface of the container and the like are appropriately roughened in order to improve the adhesiveness.

  Next, as shown in the cross-sectional front view of the main part of FIG. 6, adhesive 19 is respectively applied to the male thread 15 c of the male threaded member 15 with the electrode joint 14 attached, the distal end surface of the collar 15 d, and the female thread hole 17. After the application, the male screw portion 15 c is screwed into the female screw hole 17. Next, as shown in the cross-sectional front view of the main part of FIG. 7, the adhesive 19 is applied to the male screw portion 15c of the male screw member 15 with the flange protruding from the female screw hole 17 on the front end surface of the female screw portion 16a and the flange portion 16c. The hooked female screw member 16 is screwed.

  By screwing the female screw member 16 to the male screw portion 15c of the male screw member 15 with the flange in this way, as shown in the cross-sectional front view of the main part of FIG. 8, the flange portion 15d of the male screw member 15 with the hook and the female screw with the hook. The container wall of the container half 12 is sandwiched between the flange portion 16 c of the member 16. In this way, by attaching the container wall with the flange parts 15d and 16c inside and outside the wall surface, the mounting strength can be greatly improved as compared with the conventional screw-in bonding from the outside of the container.

  Furthermore, as shown in the side view of the main part of FIG. 9, the prepreg 20 is attached and laminated so as to cover the flange 15d of the male screw member 15 with the flange and the container wall surface 12a. At this time, the shape of the prepreg 20 may be a prepreg 20 made up of a large number of small pieces as shown in FIG. 9, but as shown in the side view of the main part of FIG. A prepreg 20 can be used. When such a ring-shaped prepreg 20 is used, the occurrence of a gap can be prevented by overlapping and pasting both ends of a portion where the ring is open.

  As shown in the cross-sectional front view of the main part in FIG. 11, after a predetermined number of prepregs 20 are stacked, the stacked prepregs are degassed and cured. Affixing and laminating the prepreg to the flange 16c portion of the flanged female screw member 16 located on the outer surface side of the container are performed in the same manner as described above. It can be performed simultaneously with the joining of the half bodies 12 and 13 or after the container half bodies 12 and 13 are joined.

  In addition, before joining the container halves 12 and 13 to the male screw 14a of the electrode joint 14 protruding to the inside of the container, a predetermined wiring is connected to a device housed in the cryostat.

  In this way, the contact portion between the flange portions 15d and 16c sandwiching the container wall and the container wall surface 12a is covered with FRP, so that leakage from between the flanged male screw member 15 and the female screw hole 17 is ensured. Can be prevented. Moreover, the insulation between aluminum vapor deposition resin provided in the wall surface as a heat insulation member can also be achieved.

  FIGS. 12 and 13 are a front view and a cross-sectional view of the main part showing another example of attaching the prepreg around the collar part, and a plurality of ring-shaped prepregs corresponding to the diameter of the collar part, for example, FIG. In the example shown in FIG. 10, a plurality of shapes having different width dimensions are created in advance and pasted in a predetermined order.

  First, the first prepreg 20a having the narrowest width is attached so as to cover the interface between the flange portion 15d and the container half 12. Next, the second prepreg 20b, which is wider than the first prepreg 20a, is attached so as to cover the first prepreg 20a. Further, a third-layer prepreg 20c wider than the prepreg 20b in the second tank is attached so as to cover the prepreg 20b in the second tank. In this way, the prepreg having a width wider than that of the lower layer prepreg is sequentially laminated to form a multilayer structure in a state of covering the lower layer prepreg, and then deaerated and cured, thereby preventing leakage through the female screw hole 17 more reliably. can do.

  Further, in this embodiment, the metal electrode joint 14 is exemplified as a member penetrating the wall surface of the FRP container. However, as shown in the cross-sectional front view of the main part in FIG. When the pipe joint 21 to be penetrated through the wall surface of the FRP cryostat 11 is used, the pipe joint 21 is connected to the FRP cryostat 11 in the same procedure as described above by using the male male screw member 15 and the female female member 16 with the hook. Can be securely attached in a penetrating state.

It is a partial cross section front view which shows one example of a FRP cryostat manufactured with the method of this invention. It is a cross-sectional front view which shows an example of the container half which forms the cryostat made from FRP. It is a principal part cross-sectional front view which shows the state which formed the female screw hole in the wall surface of a container half body. It is a principal part sectional top view which shows the state which provided the FRP seat part in the wall surface used as the circular arc surface. It is a front view of an electrode coupling, a male screw member with a hook, and a female screw member with a hook. It is a principal part sectional front view showing the state where the male screw member with a hook to which the electrode joint is attached is screwed into the female screw hole. It is a principal part cross-sectional front view which shows the state which screws the hooked female screw member to the male screw member with a hook protruding from the female screw hole. It is a principal part cross-sectional front view which shows the state which clamped the container wall with the collar part of the male screw member with a collar, and the collar part of the female thread member with a collar. It is a principal part side view which shows the state which has stuck and laminated | stacked the prepreg so that a collar part and a container wall surface may be covered. It is a principal part side view which shows the state which affixes and laminate | stacks the prepreg of another shape so that a collar part and a container wall surface may be covered. It is a principal part sectional front view which shows the state which affixed and laminated | stacked the prepreg so that a collar part and a container wall surface might be covered. It is a front view which shows the other example of affixing the prepreg around a collar part. It is a principal part sectional drawing similarly. It is a principal part sectional front view which shows the example which attached the pipe joint to the wall surface of the cryostat made from FRP.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... FRP cryostat, 12, 13 ... Container half body, 14 ... Electrode coupling, 14a ... Male screw, 15 ... Male screw member with flange, 15a ... Joint insertion hole, 15b ... Head, 15c ... Male screw part, 15d ...鍔, 15e ... engaging surface, 16 ... female screw member with hook, 16a ... female screw, 16b ... head, 16c ... heel, 17 ... female screw hole, 18 ... FRP seat, 18a ... flat surface, 19 ... Adhesive, 20, 20a, 20b, 20c ... Prepreg, 21 ... Pipe fitting

Claims (3)

  In a method for manufacturing an FRP cryostat in which a metal joint is passed through a wall of an FRP container that contains a low-temperature fluid, the metal joint is inserted into the joint insertion hole of a male screw member with a flange having an axial joint insertion hole. Then, the flanged male screw member fixed in a sealed state and fixed with a metal joint is screwed to the female screw hole formed on the wall surface of the FRP container via an adhesive, and the flange protruding from the female screw hole A female screw member with a flange is screwed onto the male screw portion of the male screw member with a flange, and the container wall is sandwiched between the flange portion of the male screw member with a flange and the flange portion of the female screw member with a flange. The FRP cryostat is manufactured by attaching and stacking a prepreg so as to cover a portion, a container wall surface, and a flange portion of the female screw member with a flange and the container wall surface, and degassing and curing the prepreg Law.   When a metal joint is provided on the curved surface portion of the FRP container, a prepreg is attached to the curved surface portion of the curved male screw member or a flange portion of the female screw member, and laminated. 2. The method of manufacturing an FRP cryostat according to claim 1, wherein the female screw hole is formed after the prepreg is deaerated and cured, and the flange contact surface is planarized.   When providing a metal joint on the curved surface portion of the FRP container, one surface of the curved surface portion has a curved surface corresponding to the curved surface portion, and the other surface is a flange portion or a flange of the flanged male screw member. 2. The method of manufacturing an FRP cryostat according to claim 1, wherein the female screw hole is formed after the FRP member having a flat surface with which the flange portion of the female screw member abuts is attached.

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