JP4571696B2 - Flange structure and pipe joint - Google Patents

Description

  The present invention relates to a pipe joint used for piping, and particularly relates to a flange structure.

In the field of piping work, it is necessary to connect the pipe ends.
For this pipe connection, various flanges (Japanese Industrial Standard) such as a welded flange, loose flange, screwed flange, integral flange, closed flange and slip-on flange are used.
In any of the flange structures described above, conventionally, a bolt is passed from one side through a bolt through hole provided in the flange and a nut is screwed from the other side to tighten (Patent Document 1 or the like).
However, with such a flange structure, the bolt must be inserted into the bolt through-hole of the flange with one hand and the nut attached to the tip of the bolt with the other hand during piping work in the field. And it was a lot of work in high-altitude work.
In particular, in high-altitude work, nuts may fall, and improvement in workability has been demanded.

Japanese Patent Laid-Open No. 9-14545

  An object of the present invention is to provide a flange structure or a pipe joint that can be connected to a pipe while a nut is preset in a bolt.

The present invention can be applied to the various flanges described above, and can be applied to any form such as a combination flange and a joint flange. The flange structure according to the present invention is a flange for connecting pipe ends. The bolt mounting recess for mounting the bolt from the outer peripheral side to the outer peripheral part of the flange, and the protrusion for preventing the bolt from dropping when the bolt is mounted are on the side opposite to the connection surface of the flange It is provided on the outer peripheral side of the bolt mounting recess on the side surface, and a flexible sheet material is superimposed on the connection side surface of the flange. The sheet material has a bolt temporary holding recess corresponding to the bolt mounting recess on the flange. and, especially that the bolt temporary holding recess that a at the opening tip with the outer peripheral side is opened, has a protrusion which protrudes into the recess inside, when the bolt mounting bolt is prevented from falling To.
In the present invention, the bolt mounting recess is provided for the following reason.
For pipe connection, it is generally necessary to fasten 3 or more bolts around the central axis, and in large pipes, it may be fastened at 6 to 8 places.
Its bolt mounting recess outer peripheral side is opened when a meaning belonging to the present invention if it has one or more, may be combined mounting recess of the conventional through-hole as the present application.

Also, it is a welded flange, loose flange, screw-in flange, integral flange, closed flange, or slip-on flange for piping, and bolts are attached to the outer periphery of the flange from the outer periphery side. For this purpose, it has a bolt mounting recess that is open on the outer peripheral side.
In this case, it may be a set flange or a joint flange having a protrusion on the outer side of the bolt mounting concave portion on the side opposite to the connection surface of the flange.

  Protrusion on the outer periphery of the bolt mounting recess is to temporarily mount the bolt and prevent the bolt from falling before final tightening.As a method of giving the same function, on the side of the flange, A sheet material having flexibility is superposed, and the sheet material has a bolt temporary holding recess corresponding to the bolt mounting recess of the flange, and the bolt temporary holding recess opens from the front end of the opening while the outer peripheral side opens. In addition, a protruding piece protruding inside the recess may be provided.

When the flange structure and pipe joint as described above are adopted, the bolts and nuts used in the flange connection according to the present invention are preset in advance to the bolts, or are subjected to a non-tightening spacer, a spring washer, a washer, etc. It is also possible to attach.
Here, the fact that the single-clamping prevention spacer can also be attached means that the single-clamping prevention spacer is not necessarily required, and a preset bolt composed of a general bolt and nut may be used.

In the flange structure and pipe joint according to the present invention, a bolt mounting recess having an outer peripheral side opened in the outer peripheral portion of the flange can be preset with a nut in advance so that a bolt can be preset in advance. Therefore, the work of attaching the nut to the end of the bolt by hand is reduced, and the work of assembling the piping is improved.
Moreover, if a protrusion is provided on the outer peripheral side of the bolt mounting recess, it is possible to prevent the bolt mounting recess from falling off only by temporarily tightening the bolt.
Here, instead of providing protrusions on the outer peripheral part, if a flexible sheet material having a protruding piece protruding inside the concave part to which the bolt is attached is superimposed on the side surface of the flange, the bolt is directed toward the inner peripheral side of the concave part. When inserting the bolt, the projecting piece is deformed and the bolt is inserted. When the bolt is mounted in the recess, the projecting piece returns to the inside so as to project inward, and the bolt is prevented from dropping before final tightening.
Further, it is possible to attach a single-clamping prevention spacer, a spring washer, a washer or the like to the bolt in advance.

The example of the pipe joint which concerns on this invention, and a preset volt | bolt nut is shown. The positional relationship between pipe fittings and bolts and nuts is shown. The procedure of pipe connection is shown. The example of the flange which combined the bolt mounting recessed part and the bolt insertion hole is shown. A state in which a washer and a spring washer are preset on the bolt is shown. The example which provided the protrusion which shows the position of a through-hole in the flange which combined the through-hole and the bolt mounting recessed part which the outer peripheral side opened is shown. An example in which sheet materials for temporarily holding bolts are overlapped is shown. The example which combined the projection part of the sheet | seat material and the flange is shown.

  The present invention can be used for pipe connection using various flanges defined in JIS. Hereinafter, a pipe joint of a loose flange will be described as an example.

In general, a pair of flanges is required to connect the end pipes.
FIG. 1B shows an example of a pair of flange combinations of the first joint 10 and the second joint 20.
FIG. 1A is an external view as viewed from the side opposite to the connection surface of the first joint 10.
The first joint 10 has a tube insertion hole 14 for inserting a pipe material to be connected at the central portion of the main body portion 11 which is a substantially disk-shaped flange plate, and a bolt mounting recess 12 whose outer peripheral side is open at the outer peripheral portion. Have
Since the outer peripheral portion of the bolt mounting recess 12 is open, it can be attached from the outer peripheral side in a so-called preset state in which the nut 31, the washer 33 and the spring washer are attached to the bolt 30 in advance.
In addition, the present Example is the example which attached the non-clamp prevention spacer 32 to the preset volt | bolt.
The washer 33 may also be provided on the nut side.
The structure of the second joint 20 is the same as that of the first joint, only being symmetric with respect to the front and back [symmetrical in FIG.

The joint of the present embodiment is an example in which four bolt mounting recesses 12 are provided around the central axis, but the number is not limited as long as it is at least three or more.
Generally, the bolt mounting recesses 12 are provided at equal intervals around the shaft, and the protrusions 13a and 13b are provided on the outer peripheral side, so that the bolts fall from the joint when the bolts are temporarily tightened. To prevent.
The height of the protrusion is a direct purpose of preventing the bolt and nut from falling only by temporary tightening, and may be equivalent to the thickness of the washer.

The second joint 20 corresponding to the first joint 10 is a plate-like main body 21 having a bolt mounting recess 22 in accordance with the first joint, and has protrusions 23 a and 23 b on the outer peripheral side of the bolt mounting recess 22. It is an example.
In addition, although this 1st coupling and the 2nd coupling are disk-shaped examples, various shapes, such as a square and a hexagon, can be employ | adopted and a protrusion part may be only one side of a volt | bolt mounting recessed part.
Moreover, there is no limitation also in the shape of a projection part.
Furthermore, you may provide a projection part only in one of a 1st coupling and a 2nd coupling.

FIG. 3 shows an example of pipe connection.
An example of a flared tube having flange portions 1a and 2a at the ends of the pipe materials 1 and 2 will be described, but the present invention is not limited to this.
The packing 3 is arrange | positioned between the collar parts 1a and 2a, and the 1st coupling 10 and the 2nd coupling 20 are faced | matched.
From the outer peripheral side, a bolt 30 preset with a washer 33, a nut 31 and a single-clamp prevention spacer 32 is mounted in the bolt mounting recesses 12 and 22.
The thickness of the single-clamping prevention spacer 32 is set to a value obtained by adding the thickness obtained by subtracting the clamping margin from the packing 3 to the thickness of the collar portions 1a and 2a, thereby preventing the connecting portion from being in a single-clamped state.

The example of the flange shown in FIGS. 1 to 3 shows an example in which all bolt mounting portions are bolt mounting recesses opened on the outer peripheral side. For example, as shown in FIG. The flange structure which combined the bolt mounting recessed parts 12 and 22 which concern on this invention may be sufficient.
Further, as for the bolt and nut, it is possible to use an anti-rotation bolt and nut in which an anti-rotation tooth is formed on the tightening surface of the bolt head or the tightening surface of the nut.
Furthermore, as shown in FIG. 5, when a bolt and nut in which a spring washer 34 and a washer 33 are inserted on the head side of the bolt and a spring washer 34 and a washer 33 are preset on the nut side are used, the bolt mounting recess 12 of the flange is used. Since the spring washer 34 acts to press the washer 33 against the flange side when the preset bolt is attached to the flange, the washer 33 is engaged with the protruding portion 13a, and the bolt is difficult to drop off from the flange. Adhesiveness is further improved.

FIG. 6 shows an example in which a protrusion 16 for indicating the position of the through hole 15 is provided in an example of a flange in which the through hole 15 closed on the outer peripheral side and the bolt mounting recess 12 opened on the outer peripheral side are combined.
If there is at least one through hole 15, the temporary mounting operation of the flange is stable, and if there is a mark such as a protrusion 16 indicating the position of the through hole 15 at this time, it can be recognized only by touching the hand, so that workability is improved. .
A mark such as a mark may be used instead of the protrusion.

7 and 8 show an example in which a sheet material 40 having flexibility is superimposed on the side surface of the flange.
The sheet material 40 has a circular cutout 41 at the center and a bolt temporary holding recess 42 corresponding to the bolt mounting recess 12 of the flange, and is bonded to the side of the flange using an adhesive or the like.
The sheet material may be made of resin or rubber as long as it bends.
Projection pieces 43a and 43b are provided inside the temporary holding recess 42 of the sheet material 40. When the bolts are inserted, the projections 43a and 43b are deformed to the outside. Prevent falling.
When the sheet material 40 is superimposed on the flange, the protrusions 13a and 13b are not necessarily required. FIG. 7 shows a case where the flange does not have a protrusion, and FIG. 8 shows an example in combination with the protrusion of the flange.

DESCRIPTION OF SYMBOLS 10 1st coupling 11 Main-body part 12 Bolt mounting recessed part 13a Protrusion part 14 Pipe insertion hole 20 2nd coupling 30 Bolt 31 Nut 32 Untightening spacer 40 Temporary holding sheet material

Claims (1)

A flange for connecting a pipe end, for mounting a bolt on the outer peripheral portion of the flange from the outer peripheral side, for preventing the bolt from dropping when the bolt is mounted on the outer peripheral side and a bolt mounting recess . Having a protrusion on the outer peripheral side of the bolt mounting recess on the side opposite to the connection surface of the flange ,
A flexible sheet material is superimposed on the connection side surface of the flange, the sheet material has a bolt temporary holding recess corresponding to the bolt mounting recess of the flange, and the bolt temporary holding recess opens on the outer peripheral side. A flange structure characterized by having a projecting piece protruding from the front end of the opening and inside the recess to prevent the bolt from dropping when the bolt is mounted .

Images