JP2012163115A - Flange, and gasket used in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange which can be coupled in highly air-tight condition than conventional ones, can be easily handled at lower cost than the conventional ones, and a gasket used in the same.SOLUTION: The flange with an optional shape is characterized in that a through hole is formed in a center part, a fitting in groove is formed in a surface surrounding the through hole, a holding part is formed by raising the bottom part of the through hole side in the fitting in groove, a knock pin hole is arranged outside of the holding part of the fitting in groove, a large groove continuing to the fitting in groove and arriving at an outer peripheral surface is formed in the front surface, a small groove continuing to the fitting in groove and arriving at the through hole is arranged in the front surface, and a plurality of bolt holes passing through from the front surface to a back surface are bored around (outside of) the fitting in groove.

Description

  The present invention relates to a flange and a gasket used for joining a tube and a tube, a tube and a container, joining the container and the container, and evacuating the inside of the tube or the container.

  Conventionally, as a vacuum flange used for joining a tube and a tube, a tube and a container, and joining a container and a container and evacuating the inside of the tube or the inside of the container, there has been a vacuum flange as in Patent Document 1.

  The vacuum flange of Patent Document 1 includes a surface groove dug down shallowly over a wide range on the surface side, a storage groove dug down one step inside the surface groove, a protrusion provided inside the storage groove, An inner groove dug down one step inside the ridge, a through hole to the back side is formed inside the inner groove, and a step and a groove bottom surface are provided along the peripheral surface of the through hole on the back side It is a vacuum flange that does not distinguish between males and females with grooves, and the end of one pipe to be connected is fitted into the joining groove and brought into contact with the bottom of the groove, and the vacuum flange is connected to the end of the other pipe. Similarly, with the vacuum flange connected, with the gasket fitted in the storage groove of one vacuum flange, the other vacuum flange surface side is stacked, the gasket is sandwiched, and the vacuum flanges are tightened and fixed with bolts The gasket is strong between ridges Tightened, it is possible to connect tubes to each other in an airtight state.

  However, the vacuum flange of Patent Document 1 can connect tubes, tubes and containers, and containers together while maintaining higher airtightness than previous flanges. In the portion, there is a problem that the conventional flange cannot sufficiently seal because the gasket cannot be sufficiently crushed.

  Conventionally, indium wires, hexagonal cross-section aluminum alloy rings, indium-plated U-tight seals, and the like have been used as methods for vacuum-sealing superconducting cavities exposed to liquid helium environments.

  However, in the case of the indium wire, there is a problem that the removal is troublesome and there is a possibility of indium contamination, which is inconvenient to handle.

  In the case of the aluminum alloy ring having the hexagonal cross section, there is a problem that the torque is high.

  Furthermore, the indium-plated U-tight seal has a problem that it is very expensive.

JP 11-82833 A

  Therefore, the present invention provides a flange that can be vacuum-sealed even if the connecting part such as a superconducting cavity exposed to a liquid helium environment is a soft metal, and that is cheaper and easier to handle than before, and a gasket used therefor To do.

  In order to solve the above-described problem, the present invention is a flange having an arbitrary shape, and a through hole is formed in a central portion, and an insertion groove is formed on the surface so as to surround the through hole. The bottom part on the through-hole side is raised to form a sandwiching part, a knock pin hole is provided outside the sandwiching part of the fitting groove, a large groove is provided on the surface to reach the outer peripheral surface, and a large groove is provided on the surface. A flange structure characterized in that a small groove that reaches the through hole is provided continuously with the insertion groove, and a plurality of bolt holes that penetrate from the surface to the back surface are formed around (on the outside) of the insertion groove. .

  Further, the knock pin hole is provided with a first hole and a second hole having a diameter smaller than that of the first hole and having a thread groove on a peripheral surface thereof and communicated with the first hole, and is opposed to the through hole. Two knock pin holes are provided, and the large groove is opposed to the through hole with the two large grooves provided at a position perpendicular to a line connecting the two knock pin holes, and the small groove is opposed to the through hole. And having two small grooves provided on a line connecting the two large grooves.

  The fitting groove, the clamping part, the knock pin hole, the large groove, and the small groove are also formed on the back surface of the flange.

  Further, the pinching portion is a ridge, the depths of the bottom portions on the inside and outside of the ridge are made equal, and one or more gas venting recesses are formed on the bottom portion on the inner side of the ridge of the fitting groove, The flange is characterized by allowing air to escape into the small groove.

  Further, a gasket used for the flange, wherein a through hole having the same shape as the outer shape of the insertion groove of the flange and slightly smaller and having the same diameter as the through hole is formed, and a positioning recess is formed at a position corresponding to the knock pin hole. When the flanges are formed and connected to each other, the flange gasket is configured to be sandwiched between the insertion grooves of the flanges and to be compressed and deformed in the insertion grooves.

  In addition, the flange pipe is composed of the flange and an inner pipe joined to the through hole of the flange, and when the flanges of the same shape are joined together, the gap between the inner pipes becomes very small or compressed. The flange pipe is characterized by being deformed.

  Since the present invention is configured as described above, for example, even when high confidentiality is required such as a vacuum seal of a superconducting cavity placed in a superfluid helium environment, it can be dealt with. .

  Further, even in a connection under the special environment as described above, it is cheaper than the conventional one and can be easily handled.

It is a top view of the flange which is this invention. It is an AA line sectional view of the flange which is the present invention. It is a BB sectional view of the flange which is the present invention. It is the cross-sectional enlarged view which showed the connection state of C parts of the flange which is this invention. It is the cross-sectional enlarged view which showed the connection state of D parts of the flange which is this invention. It is a top view of the 2nd example of a flange which is the present invention. It is the EE sectional view taken on the line of the 2nd Example of the flange which is this invention. It is the FF sectional view taken on the line of the 2nd Example of the flange which is this invention. It is the cross-sectional enlarged view which showed the connection state of G parts of the 2nd Example of the flange which is this invention. It is the cross-sectional enlarged view which showed the connection state of H parts of the 2nd Example of the flange which is this invention. It is a top view of the gasket used for the flange which is this invention. It is sectional drawing which shows the usage example of the flange which is this invention. It is the I section expansion simplification figure of sectional drawing which shows the usage example of the flange which is this invention. It is the J section expansion simplification figure of sectional drawing which shows the usage example of the flange which is this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  The following embodiments are applied to all arbitrary-shaped flanges, but a circular flange will be described as an example of an arbitrary-shaped flange with reference to the drawings. The illustrated inner tube 2 is not an essential member constituting the flange 1 but is inserted into the through hole 2b provided in the flange 1, and joins the outer wall surface of the inner tube 2 and the inner wall surface of the through hole 2b. The portion indicated by reference numeral 2c is a joint portion.

  FIG. 1 is a plan view of a flange according to the present invention, FIG. 2 is a sectional view taken along line AA of the flange, FIG. 3 is a sectional view taken along line BB of the flange, and FIG. FIG. 5 is an enlarged cross-sectional view, and FIG.

  As shown in FIG. 1 to FIG. 5, the flange 1 according to the present invention is a flange having an arbitrary shape, and a through hole 2 b is formed at the center, and the insertion groove 3 is formed on the surface so as to surround the through hole 2 b. And forming a pinching portion by raising the bottom portion of the insertion groove 3 on the side of the through hole 2b, providing a bottomed knock pin hole 4 outside the pinching portion of the insertion groove 3, and forming the insertion groove 3 on the surface. Is provided with a large groove 2e which reaches the outer peripheral surface and is provided with a small groove 2f which is continuous with the insertion groove 3 and reaches the through-hole 2b on the surface. Is formed with a plurality of bolt holes 2d, 2d, 2d,.

  The insertion groove 3 is formed so as to surround the through hole 2b, and the inner diameter of the insertion groove 3 is slightly larger than the diameter of the through hole 2b. Therefore, the inner diameter of the through hole 2b and the insertion groove 3 is not in contact.

  Moreover, although the bottom part by the side of the through-hole 2b in the said insertion groove | channel 3 is raised, a clamping part is formed, In Example 1, the said clamping part is made into the protrusion 3a, and the depth of the bottom part inside the said protrusion 3a and an outer side Made equal. That is, the fitting groove 3 forms an outer groove 3d and an inner groove 3e by the protrusion 3a.

  The knock pin hole 4 includes a first hole 4a and a second hole 4b having a diameter smaller than that of the first hole 4a and a thread groove formed on a peripheral surface thereof and communicating with the first hole 4a. In the first embodiment, as shown in FIG. 1, two knock pin holes 4 are provided to sandwich the through hole 2b, but the number and arrangement of the knock pin holes 4 are not particularly limited. Moreover, although the diameter of the insertion port of the knock pin hole 4 is slightly sharpened and the extended portion 4c is provided, it is not limited and may not be provided.

  The large groove 2e is a groove that is connected to the outer groove 3d of the insertion groove 3 and reaches the outer peripheral surface and is slightly deeper than the insertion groove 3. In FIG. 1, two large grooves 2e are provided, and the through hole 2b Between the two knock pin holes 4 and 4 and provided at a position perpendicular to the line connecting the two knock pin holes 4 and 4.

  The small groove 2f is a groove that is continuous with the inner groove 3e of the fitting groove 3 and reaches the through hole 2b, and is much shallower than the fitting groove 3. In FIG. Then, the through hole 2b was sandwiched and opposed to each other and provided on a line connecting the two large grooves 2e and 2e.

  The two large grooves 2e and the two small grooves 2f are preferably all located on the extension line, and the two large grooves 2e, the two small grooves 2f, and the two knock pin holes 4 are preferably in a vertical position. However, there is no particular limitation, and other positional relationships may be used.

  A plurality of the bolt holes 2d are formed by penetrating from the front surface to the back surface of the fitting groove 3 (outside).

  As shown in FIGS. 1 to 5, the flange 1 is formed with one or more degassing recesses 3 b on the bottom (inner groove 3 e) inside the protrusion 3 a of the insertion groove 3. As can be seen from FIG. 1, in Example 1, it is preferable to provide a total of four degassing recesses 3b on the line connecting the knock pin holes 4 and 4 and on the extension line connecting the small grooves 2f and 2f. The position of the recess 3b for extraction is not limited.

  Next, the joining state of the flange 1 is demonstrated using FIG.4 and FIG.5. The flange 1 according to the present invention is joined to each end of two pipes to be connected (or two containers, or a pipe and a container), and the flanges 1 are bolted to each other. Fix each other or tube and container). At this time, the flange 1 is fixed by aligning the positions of the C parts in FIG. 2 and the D parts in FIG. 3. The end portion of the tube (or container) is inserted into the through hole 2b of the flange 1, and the inner wall surface of the through hole 2b and the outer peripheral surface of the end portion of the tube (or container) are joined, and the joining method is particularly limited. do not do.

  Based on the above, first, the connection between the C parts will be described with reference to FIG. First, the knock pin 5 is inserted into the knock pin hole 4 provided in one flange 1 where the end of the pipe (or container) on the connection portion 2g side is joined, and the screw pin 5 and the second of the knock pin hole 4 are inserted. The hole 4b is screwed.

  The knock pin 5 is composed of a pin body 5a and a threaded portion 5b connected to one end of the pin body 5a. The diameter of the pin body 5 is larger than the diameter of the threaded portion 5b. A screw thread is formed on the peripheral surface of the screwing portion 5b.

  As described above, in a state where the knock pin 5 is screwed and connected to the knock pin hole 4, the screw portion 5b and a part of the pin body 5a on the screw portion 5b side are located in the knock pin hole 4 of one flange 1. The other end side of the pin body 5a protrudes from the knock pin hole 4.

  In FIG. 1, since two knock pin holes 4 are provided in the flange 1, the knock pin 5 is also screwed into the other knock pin hole 4.

  Next, the gasket 6 is attached to the flange 1 to which the knock pin 5 is attached. The gasket 6 is inserted in the state where the pin main bodies 5a and 5a protruding from the flange 1 are fitted in the positioning recesses 6a and 6a provided on the outer periphery of the gasket 6. Is inserted into the insertion groove 3.

  The gasket 6 has a thickness, and the thickness of the gasket 6 is greater than the depth of the protrusion 3a (or the sandwiching portion 3c). Therefore, even if the gasket 6 is fitted into the fitting groove 3 of one flange 1 as described above, a part of the gasket 6 protrudes from the fitting groove 3.

  After the knock pin 5 and the gasket 6 are attached to one flange 1 as described above, the pin body 5a protruding from the flange 1 is fitted into the first hole 4a of the flange 1 joined to the other pipe, and protrudes from the flange 1. A part of the gasket 6 is inserted into the insertion groove 3 of the other flange 1 to connect the flanges 1 to each other.

  When the flanges 1 are fastened together with the bolts 7 and the nuts 7a in the above-described state, the gasket 6 is pressed between the insertion grooves 3 of the flanges 1 and 1 and the protrusions 3a provided in the insertion grooves 3, Since the portion 3a protrudes from the bottom of the insertion groove 3, the gap between the protrusions 3a and 3a is narrowed, and therefore the gasket 6 is a portion that is more strongly pressed.

  As described above, by creating a vacuum seal part with a gasket outside the connection part between tubes (or between containers, or between a tube and a container), tubes made of soft metal (or between containers, or between a tube and a container) The connecting portion can be sufficiently sealed.

  Further, as shown in the lower diagram of FIG. 4, the gasket 6 fills most of the space formed by the insertion grooves 3 and 3, and this structure allows the inner grooves 3e and 3e of the insertion grooves 3 and 3 to be filled. Since there is a problem that a small amount of air remains in the space formed between them, gas venting recesses 3b and 3b are provided at the bottom of the inner groove 3e as a refuge for the air.

  Next, the connection between the D parts of the flange 1 will be described with reference to FIG. In the connected state of the D parts when the flanges 1 are connected to each other by the procedure described in FIG. 4, as shown in the lower diagram of FIG. Similarly, the portion 3a is also strongly pressed.

  However, since a small groove 2f that connects the inner groove 3e of the insertion groove 3 and the through hole 2b is formed in the portion D, a smaller gap 8 between the small grooves 2f and 2f is formed, and air is released from the gap 8. be able to. Therefore, it is possible to prevent air accumulation in the slight gap formed by the inner grooves 3e and 3e and the degassing recess 3b.

  The small groove 2f is also preferably provided at the same position on the end of the pipe (or container) to which the flange 1 is joined. By doing so, the air in the inner groove 3e is more effectively released. I can do things.

  Further, a large groove 2e that connects the outer groove 3d of the fitting groove 3 and the outer periphery of the flange 1 is formed in the portion D, and a space 8a is formed by the large grooves 2e and 2e. The space 8a can release the air on the outer groove 3d side of the fitting grooves 3 and 3 and inserts a separating tool when the flanges 1 and 1 after connection are removed to easily separate the flanges 1 and 1 from each other. It is also a space for.

  Next, a second embodiment of the flange according to the present invention will be described with reference to FIGS.

  FIG. 6 is a plan view of a second embodiment of the flange according to the present invention, FIG. 7 is a sectional view taken along line EE of the second embodiment of the flange, and FIG. 8 is a sectional view taken along line FF of the second embodiment of the flange. FIG. 9 is an enlarged cross-sectional view showing a connected state of the G parts of the second embodiment of the flange, and FIG. 10 is an enlarged cross-sectional view showing a connected state of the H parts of the second embodiment of the flange.

  As shown in FIGS. 6 to 10, the flange 1 a according to the present invention has substantially the same structure as the flange 1 shown in the first embodiment.

  That is, it is a flange having an arbitrary shape, and a through hole 2b is formed at the center, and a fitting groove 3 is formed on the surface so as to surround the through hole 2b, and the bottom of the fitting groove 3 on the side of the through hole 2b is formed. A pinching portion is formed by raising the pin, a bottomed knock pin hole 4 is provided outside the pinching portion of the fitting groove 3, a large groove 2e is provided on the surface and is continuous with the fitting groove 3 and reaches the outer peripheral surface. A small groove 2f that is continuous with the insertion groove 3 and reaches the through hole 2b is provided, and a plurality of bolt holes 2d, 2d, 2d,. It is characterized by being drilled.

  The portion of the first embodiment different from the flange 1 is the shape of the clamping portion 3c, and the flange 1 has a protrusion 3a. However, as shown in the right view of FIG. The sandwiching part 3c is one step higher than the bottom part of 3 and no degassing recess 3b is provided.

  Therefore, as shown in the lower part of FIG. 9, when the gasket 6 is pressed between the insertion grooves 3 and 3, the gasket 6 is most strongly pressed by the holding portion 3 c, and the holding portion 3 c of the insertion grooves 3 and 3. Air is pushed into a slight gap formed by 3c.

  However, since the small groove 2f is also formed in the flange 1a, the air pushed into the slight gap formed by the holding portions 3c and 3c of the fitting grooves 3 and 3 escapes from the gap 8 formed by the small grooves 2f and 2f. be able to.

  In addition, in the flanges 1 and 1a shown in FIGS. 1 to 10, the fitting groove 3, the clamping portion 3c (or the protrusion 3a), the knock pin hole 4, the large groove 2e, and the small groove 2f are provided on one surface of the flanges 1 and 1a. However, these may be provided on the opposite surface and provided on both surfaces of the flanges 1 and 1a. The flange provided with the fitting groove 3, the clamping part 3c (or the protrusion 3a), the knock pin hole 4, the large groove 2e, and the small groove 2f on both sides is used as a flange that comes to the center when the flanges are joined to three pieces. To do.

  Next, the gasket will be described with reference to FIG. FIG. 11 is a plan view of a gasket used for the flange according to the present invention.

  The gasket 6 is a gasket used for the flanges 1 and 1a, and is formed with a through hole 6b having the same shape as the outer shape of the fitting groove 3 of the flanges 1 and 1a and slightly smaller than the through hole 2b. When the positioning recess 6a is formed at a position corresponding to the knock pin hole 4 and the flanges 1 (1a) are connected to each other, they are sandwiched between the insertion grooves 3 and 3 of the flanges, Deforms with pressure.

  The outer shape of the gasket 6 shown in FIG. 11 is substantially donut-shaped because the planar shape of the flanges 1, 1 a shown in FIGS. 1 to 10 is donut-shaped, but is not particularly limited. If the external shape of 1 and 1a is a rectangular shape and the insertion groove 3 to be formed is also rectangular, the gasket 6 is also rectangular according to the insertion groove 3.

  Further, as described above, the thickness of the gasket 6 is larger than the depth of the protrusion 3a (or the sandwiching portion 3c), and in this way, the gasket 6 is sandwiched between the fitting grooves 3 and 3. At this time, the protrusion 3a (or the sandwiching portion 3c) is pressed to increase the sealing degree.

  Finally, an example using the flanges 1 and 1a and the gasket 6 according to the present invention will be described with reference to FIGS.

  12 is a sectional view showing an example of use of the flange according to the present invention, FIG. 13 is an enlarged view of I part of the sectional view showing an example of use of the flange, and FIG. 14 is an enlarged simplified view of J part of the sectional view of the example of use of the flange. FIG.

  In FIG. 12, a pipe made of a high-purity soft material such as niobium material is connected by a flange 1 (1 a) to form a beam pipe, and the beam pipe is installed in the box body 9. An example in which liquid helium 9a is filled is shown.

  A flange 1b is joined to the end of the tube 10 having the expanded portion 10a, a flange 1c is joined to the end of the tube 10b, and the flange 1b and the flange 1c are further connected (I portion). A flange 1d is joined to the other end of the tube 10b, and a flange 1f is joined to an end of the tube 10c. The flange 1d and the flange 1f are connected via a flange 1e (J portion). ).

  As shown in FIG. 13, in the I part, the knock pin 5 is screwed into the knock pin hole 4 on the flange 1b side, the gasket 6 is attached, and then the flange 1c is connected.

  It is difficult to directly join the tubes made of high-purity soft material such as niobium material, and they are connected via the flange 1 (1a) according to the present invention as shown in FIG. The flange 1 (1a) and the gasket 6 play a major role in preventing liquid helium 9a from entering.

  However, as described above, when connecting the pipes made of niobium with the flanges as described above, if the mounting positions of the flanges on the pipes are shifted so that the pipes 10 and 10b are in contact with each other, the niobium is connected when the flanges are connected. Since the tubes 10 and 10b made of the material are pressed and deformed to be in close contact with each other, the electrical characteristics of the beam pipe are further improved.

  As shown in FIG. 14, at the J portion, the knock pin 5 is screwed into the knock pin hole 4 on the flange 1d side, the gasket 6 is attached and the flange 1e is connected, and the knock pin 5 is further screwed into the knock pin hole 4 on the flange 1f side. The gasket 6 is attached to connect the flange 1e and the flange 1f.

  When connecting the flanges 1d and 1f joined to each other at a distance between the tubes 10b and 10c, the pipes 10b and 10c can be connected to each other by inserting a flange 1e between which the flanges 1d and 1f are not joined. The beam pipe can be configured without contact.

  The flange 1e is a flange having a fitting groove 3, a pinching portion (projection 3a), a knock pin hole 4, a large groove 2e, and a small groove 2f formed on both sides, and other flanges can be connected from both sides.

  In addition, when connecting flanges, it is not specifically limited to which flange the knock pin 5 is screwed into the knock pin hole 4 and the gasket 6 is attached.

  The flange according to the present invention and the gasket used therein can be used even when high confidentiality such as a vacuum seal of a superconducting cavity is required, and is inexpensive and easy to handle. Make a significant contribution to this area.

DESCRIPTION OF SYMBOLS 1 Flange 1a Flange 1b Flange 1c Flange 1d Flange 1e Flange 1f Flange 2 Inner cylinder 2a 鍔 2b Through hole 2c Joint part 2d Bolt hole 2e Large groove 2f Small groove 2g Connection part 3 Insertion groove 3a Convex strip 3b Degassing concave part 3c Holding part 3d Outer groove 3e Inner groove 4 Knock pin hole 4a First hole 4b Second hole 4c Expansion part 5 Knock pin 5a Pin body 5b Screw part 6 Gasket 6a Positioning recess 6b Through hole 7 Bolt 7a Nut 8 Gap 8a Space 9 Box 9a Liquid helium 10 pipe 10a expansion part 10b pipe 10c pipe

Claims (6)

A flange of any shape,
A through hole is formed in the central part, an insertion groove is formed on the surface surrounding the through hole, a bottom part on the through hole side in the insertion groove is raised to form a holding part, and the outside of the holding part of the insertion groove A knock pin hole is provided on the surface, a large groove is provided on the surface that is continuous with the insertion groove and reaches the outer peripheral surface, a small groove is provided on the surface that is continuous with the insertion groove and reaches the through hole, and the periphery of the insertion groove ( A flange characterized in that a plurality of bolt holes penetrating from the front surface to the back surface are formed on the outer side). The knock pin hole is composed of a first hole and a second hole having a diameter smaller than that of the first hole and having a thread groove on a peripheral surface thereof and communicating with the first hole. With a knock pin hole,
The large groove is two large grooves provided at a position perpendicular to a line connecting the two knock pin holes with the through hole interposed therebetween,
The small groove,
2. The flange according to claim 1, wherein two small grooves are provided on a line connecting the two large grooves so as to face each other through the through hole.   The flange according to claim 1 or 2, wherein the insertion groove, the clamping portion, the knock pin hole, the large groove, and the small groove are also formed on the back surface of the flange.   The pinching portion is a ridge, the depths of the bottoms on the inside and outside of the ridge are made equal, and one or more gas venting recesses are formed on the bottom inside the ridge of the fitting groove, and the small groove The flange according to any one of claims 1 to 3, wherein air is allowed to escape. A gasket used for the flange according to any one of claims 1 to 4,
When forming the through hole having the same shape as the outer shape of the insertion groove of the flange and having the same diameter as the through hole, forming a positioning recess at a position corresponding to the knock pin hole, and connecting the flanges, A flange gasket, which is sandwiched between insertion grooves of each flange and is compressed and deformed in the insertion grooves. A flange pipe comprising the flange according to any one of claims 1 to 4 and an inner pipe joined to a through hole of the flange, wherein the inner pipe is joined when the flanges having the same shape are joined to each other. A flange tube characterized in that the gap of the tube is very small or is deformed by compression.

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