JP3130472B2 - Connection device for flanged pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection device for joining two flanges to each other in a flanged tube such as a waveguide used for a transmission line of microwaves or the like.

[0002]

2. Description of the Related Art A waveguide will be described as an example of a generally-fitted flanged tube. For example, as shown in FIG. 8, the waveguide 1 has a rectangular longitudinal section, and a flange 2 is formed at the tube end. The flange 2 is provided with a predetermined number (ten in this example) of connection holes 3. As shown in FIG. 9, when connecting two flanges 2 formed by two waveguides 1, first, the two waveguides 1 are overlapped so that the connection holes 3 provided in the flanges 2 coincide with each other. A hexagonal bolt 32 fitted with a flat washer 31 is passed through one of the overlapping connection holes 3 as a connecting device 30, and a flat washer 33, a spring washer 34, and a nut 3
5, the nuts 35 or the hexagonal bolts 32 are turned and tightened to connect the flanges 2 of the waveguide 1 to each other.

[0003]

However, the above-mentioned conventional connection device has the following problems.
That is, for example, when the nut is turned, it is necessary to fix the hex bolt on the other side so that the hex bolt does not idle. Therefore,
For one tightening, it was not possible to perform the tightening unless tools were prepared on both sides of the bolt side and the nut side and work was performed from both sides. In addition, the work of fitting flat washers, spring washers, and nuts to the connection holes at each of the ten locations after the hexagon bolts are passed is required when the work space is small or the work posture is low. This is painful and labor intensive for the person, and requires a great deal of work time, making it difficult to perform fastening work and the like.

[0004] In addition, when removing the connecting device, it is necessary to turn each nut until it is separated from the screw portion of the hexagonal bolt. Each individual part must be stored separately. Also in these respects, if the frequency of attachment / detachment frequency, the number of connection points, etc. increase, the number of man-hours becomes further enormous, and work cannot be performed efficiently.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to provide a connection device for a pipe with a flange that can easily and efficiently perform a connection operation between flanges of the pipe. With the goal.

[0006]

The present invention has the following configuration in order to achieve the above object. That is, the invention according to claim 1 is an instrument for connecting flanges of pipes, which is inserted into a plurality of connection holes provided in each flange, and has a locking groove or a locking hole at one end. And an engaging member that individually fits into a locking groove or a locking hole of each screw shaft, and engages with an edge of the flange to restrict rotation of the screw shaft around the axis. And a fastening member that is screwed to the other end of the screw shaft at a position sandwiching both flanges with the engaging member to fasten the flanges to each other.

The invention according to claim 2 is an instrument for connecting flanges of pipes, which is inserted into a plurality of connection holes provided in the respective flanges, and has a locking groove or a groove at one end. A screw shaft having a locking hole, and an engagement member that restricts rotation of the screw shaft around its axis by fitting together into a locking groove or a locking hole of several screw shafts;
And a fastening member for screwing to the other end of each of the screw shafts at a position sandwiching both flanges with the engaging member and fastening the flanges together.

[0008]

The operation of the first aspect of the invention is as follows. First, the flanges of the pipes to be connected are overlapped with each other, and a plurality of connection holes provided on the respective flanges are matched. A screw shaft having a locking groove or a locking hole at one end is inserted into each of the connection holes. The engaging members are individually fitted into the locking grooves or holes in the respective screw shafts that are inserted and protrude from the flange end surfaces. At the same time, these engaging members engage the edges of the flange.
The rotation about the axis of the screw shaft is regulated by this engagement member. Next, a fastening member is screwed to the other end of the screw shaft at a position sandwiching both flanges with the engaging member, and the flanges are fastened to each other.

The operation of the invention described in claim 2 is as follows. The flanges of the pipes to be connected are overlapped with each other, and a plurality of connection holes provided in the respective flanges are matched. A screw shaft having a locking groove or a locking hole at one end is inserted into each of the connection holes. The engaging members are collectively fitted into the locking grooves or holes in the several screw shafts that are inserted and protrude from the flange end surfaces. By fitting several pieces together, the rotation of these screw shafts around the axis is regulated respectively. Next, a fastening member is screwed to the other end of the screw shaft at a position sandwiching both flanges with the engagement member, and the flanges are fastened to each other.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> In this embodiment as well, the waveguide shown in the conventional example will be described as an example of a flanged tube. FIG. 1 is a perspective view showing a waveguide and a connection device according to a first embodiment, FIG. 2 is an enlarged perspective view of a main part of the connection device, and FIG. 3 is a perspective view showing a state where the waveguide is connected by the connection device. FIG. 4 and FIG.
It is a perspective view in the other side of FIG.

As shown in FIG. 1, the waveguide 1 is formed in a rectangular shape in longitudinal section, and is generally used as a transmission line for microwaves or the like. A flange 2 is formed around the end of the waveguide 1. As shown in FIG. 8, the flange 2 is provided with ten connection holes 3 used for connecting, for example, two waveguides 1 with the respective flanges 2. A connection tool 4 described later is fitted into these connection holes 3.

The connection tool 4 includes a screw shaft 5 inserted into the connection hole 3 and an engagement member 6 which is engaged with one end of the screw shaft 5.
And a fastening member 7 screwed to the other end of the screw shaft 5. As shown in FIG. 2 in an enlarged manner, the screw shaft 5 has a pair of locking grooves 8 formed at one end thereof in a shaft radial direction. The bottom surfaces of the locking grooves 8 are cut so as to be parallel.
Further, a screw portion 9 is formed on the other end side. Except for the locking groove 8, portions other than the screw portion 9 are machined into a round shaft shape. The engaging member 6 has a cross section formed in a shape of “L”,
A cutout portion 10 is provided on one of the folded surfaces. The inner edge of the notch 10 is fitted into the locking groove 8 of the screw shaft 5. Further, the inner wall portion 11 of the folded back surface is engaged with the edge 2 a (see FIG. 1) of the flange 2 located near the corresponding connection hole 3. When the screw shaft 5 is inserted into the connection hole 3 of the flange 2, the engagement member 6 regulates the rotation of the screw shaft 5 around the axis. As shown in FIG. 1, the fastening member 7 includes a flat washer 12, a spring washer 13 and a nut 14.
It is composed of The nut 14 is screwed into the threaded portion 9 of the screw shaft 5 at a position sandwiching both flanges 2 with the engaging member 6 via the screw shaft 5 inserted into the connection hole 3 of the flange 2, thereby forming the flange 2. They are designed to tighten each other.

The connection device 4 for the waveguide 1 according to the present embodiment is configured as described above, and the connection operation and the like will be described below.

In connecting the two flanges 2 of the two waveguides 1, first, the flanges 2 of the waveguides 1 to be connected are overlapped with each other, and a plurality of connecting flanges provided on the respective flanges 2 are connected. The holes 3 are respectively matched. And
In these connection holes 3, the fastening members 7
Is inserted from the end side having the locking groove 8. At this time, the insertion operation of the screw shaft 5 is stopped at a position where the screw shaft 5 protrudes from the connection hole 3 on the flange surface on the side opposite to the inserted side and the locking groove 8 is confirmed.
In addition, the insertion stop position of the screw shaft 5 corresponding to the thickness of the overlapped flanges 2 is recognized in advance, and the screw shaft 5 is fitted to the screw shaft 5 at a position where the locking groove 8 is confirmed in the inserted state. The flat washer 12 of the inserted fastening member 7 may be brought into contact with the flange surface to stop the insertion operation of the screw shaft 5. By doing so, the work on site can be performed more quickly than when the fastening member 7 is inserted from the end of the screw portion 9 after the screw shaft 5 is inserted into the connection hole 3. In addition, even when the working space is narrow, the labor of the worker can be remarkably reduced.

When the locking groove 8 of the screw shaft 5 is confirmed, for example, at the position of the upper connection hole 3 shown in FIG. Edge 2
The screw shaft 5 is slightly rotated around the axis so as to be in a direction along the axis a. Thereafter, the engaging member 6 is positioned from above the adjacent edge 2a.
And the notch 10 is fitted into the locking groove 8. At this time, the folded inner wall portion 11 (see FIG. 2) of the engaging member 6 is engaged with the edge 2a of the flange 2. This restricts the rotation of the screw shaft 5 around the axis.

Next, at the position where both flanges 2 are sandwiched between the engaging member 6 and the nut 14, the nut 14 of the tightening member 7 fitted to the screw portion 9 of the screw shaft 5 is screwed temporarily. The above operation is sequentially performed for each of the ten connection holes 3. 1
When the temporary fastening is completed in each of the 0 connection holes 3,
Finally, each is tightened to the specified pressure. As shown in FIGS. 3 and 4, the two flanges 2 are fastened to each other by the connection tools 4 attached to the connection holes 3, and the connection of the waveguide 1 is completed. According to the connection operation by the connection device 4, it is only necessary to tighten the nut 14 as compared with the conventional operation in which the operation is performed by using a tool from both sides of the bolt and the nut. It can be done easily.

It is not necessary to sequentially perform the operation for each of the ten connection holes 3, and separately, the screw shaft 5 is connected to each of the connection holes 3.
After the first insertion, the engagement members 6 may be individually fitted, and the connection order is not limited to the above.

Conversely, in the operation of removing the connecting device 4, the order of the above-described mounting operation may be reversed. That is, the nut 14 of the tightened fastening member 7 is slightly loosened. Due to this slight loosening, the engaging member 6 and the side surface of the flange 2 are separated from each other, so that the engaging member 6 can be inserted and removed from the locking groove 8 of the screw shaft 5. Then, if the engaging member 6 is removed and the screw shaft 5 is pulled out to the side of the fastening member 7, the connecting device 4 can be easily removed from the flange 2, and the flanges 2 can be separated from each other. Therefore, the connection operation can be easily performed as compared with the conventional case in which the connection device cannot be removed from the flange unless the nut is turned to the end of the bolt.

<Second Embodiment> A connection device according to a second embodiment will be described with reference to FIG. FIG. 5 is a perspective view showing a waveguide and a connection device according to the second embodiment. In the figure,
Portions denoted by the same reference numerals as those in the first embodiment described above have the same configuration as in the first embodiment, and a description thereof will be omitted. In the second embodiment, basically, the engaging member in the connection device of the first embodiment is modified.

As shown in FIG. 5, the screw shaft 5 and the tightening member 7 of the connecting device 4 have the same configuration as that of the first embodiment. The engaging member 16 is formed in a long plate shape, and notches 17 are provided at three long sides. The interval between the notches 17 is the same as the interval between the connection holes 3. The inner edges of the notches 17 are fitted together into the locking grooves 8 of the three screw shafts 5 inserted into the connection holes 3. The engagement member 16 allows the screw shaft 5 to be inserted into three connection holes 3 on one side (the upper side in FIG. 5) of the flange 2.
In the inserted state, the rotation of these screw shafts 5 around the axis is regulated.

That is, the connection hole 3 on one side of the flange 2
When the locking groove 8 is confirmed by inserting the screw shaft 5 into each of the above, the operation of inserting the screw shaft 5 is stopped. When the locking groove 8 of the screw shaft 5 is confirmed, for example, at the position of the upper connection hole 3 shown in FIG. 5, each of the pair of locking grooves 8 is located at the edge 2 a of the adjacent flange 2. Three screw shafts 5 in such a direction (all the locking grooves 8 are arranged side by side).
Are slightly rotated around the axis. Thereafter, the engaging member 16 is advanced from the side of the adjacent edge 2a, and the cutout portions 17 are fitted into the respective locking grooves 8 collectively. By fitting several pieces together, the rotation of these screw shafts 5 around the axis is regulated. Thereafter, similarly to the first embodiment, the fastening members 7 are respectively screwed and tightened.
The engaging member 16 is provided with cutouts 17 at three places. However, if there are two connecting holes 3 on one side of the flange 2 (the left side in FIG. 5), the cutouts 17 are formed at two places. An engagement member provided with a notch may be used.

According to the engagement member 16, a plurality of connection points can be processed collectively, so that the work efficiency can be further improved. Further, since the shape is simple, processing is easy.

The present invention can be modified as follows. FIG. 6 is a perspective view showing a modification of the connection device, and FIG. 7 is a perspective view showing a modification of the waveguide and the connection device. In each of the above embodiments, the waveguide 1 is taken as an example of a flanged pipe, but the present invention is not limited to this, and can be applied to various flanged pipes such as a water pipe. Although ten connection holes 3 are provided in the flange 2 of the waveguide 1, the number of connection holes 3 is not limited to the above embodiment.

In the above embodiment, the connecting device 4 is
The notch 10 of the engaging member 6 is fitted into the locking groove 8 engraved on the screw shaft 5, but the present invention is not limited to this. For example, as shown in FIG. A locking hole 18 formed in a square cross section may be provided at one end of the screw shaft 5 and an engagement member 19 fitted into the locking hole 18 may be used. The engagement portion of the locking hole 18 and the engagement member 19 is not limited to a square shape, but may be, for example, an elliptical shape or another square shape.

In each of the above-described embodiments, the cross-section of the waveguide 1 is rectangular, and the connecting device 4 adapted to the shape of the waveguide 1 is illustrated. However, the present invention is not limited to this. As shown in FIG. 7, if the waveguide 1 is formed in a cylindrical shape, the engagement member 20 of the connection device 4 is supported, for example, at two points along the circumferential surface of the waveguide 1. What is necessary is just to comprise.

In the above embodiment, the fastening member 7 of the connection device 4 is constituted by the flat washer 12, the spring washer 13 and the nut 14. However, the present invention is not limited to this. By using the one in which the spring washer and the spring washer are integrally formed and fitted into the screw shaft 5, the parts can be properly stored without being dissipated after being removed. it can. Further, the fastening member 7 may have another configuration or combination. Furthermore, the screw shaft 5
The length may be appropriately determined according to the thickness of the two flanges 2 to be connected.

In the above embodiment, the screw portion 9 of the screw shaft 5 is inserted before the screw shaft 5 is inserted into the connection hole 3 in the connection operation.
Although the fastening member 7 is fitted in advance in
After inserting the screw shaft 5 into the connection hole 3, the fastening member 7 may be fitted into the screw portion 9 of the screw shaft 5. When the screw shaft 5 is inserted into the connection hole 3, the screw shaft 5 is inserted from the end having the locking groove 8, but may be inserted from the end having the screw 9.

[0028]

As is apparent from the above description, according to the first aspect of the present invention, the engagement grooves or the engagement holes of the respective screw shafts inserted into the connection holes between the flanges of the pipes are formed. The rotation of the screw shaft around its axis is restricted by the engagement of the engagement members individually and the engagement of the engagement members with the edges of the flanges. The flanged pipe is connected by screwing the tightening member to the other end of the flange and connecting it. Therefore, it is not necessary to perform work on both sides sandwiching both flanges that have been overlapped as in the conventional case, and the side of the tightening member The connection operation can be performed only by using only the flange, and the connection between the flanges can be easily performed. Also, when removing the connecting device, the engaging member can be disengaged from the locking groove or the locking hole of the screw shaft by only slightly loosening the tightening member. Work can be performed quickly and easily. As a result, it is possible to improve the work efficiency regarding the connection of the flanged pipe.

According to the second aspect of the present invention, the engaging members are fitted together into the locking grooves or holes of several screw shafts inserted through the connection holes between the flanges of the pipe. As a result, the rotation of these screw shafts around the axis thereof is regulated, and a flanged pipe is formed by screwing a tightening member to the other end of the screw shaft at a position sandwiching both flanges with the engaging member and tightening. Is performed, a plurality of connection points can be processed collectively, and the work efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a waveguide and a connection device according to a first embodiment.

FIG. 2 is an enlarged perspective view of a main part of the connection device.

FIG. 3 is a perspective view showing a state in which the flanges of the waveguides are connected by a connection device.

FIG. 4 is a perspective view on the opposite side of FIG. 3;

FIG. 5 is a perspective view showing a waveguide and a connection device according to a second embodiment.

FIG. 6 is a perspective view showing a modification of the connection device.

FIG. 7 is a perspective view showing a modified example of the waveguide and the connection device.

FIG. 8 is a perspective view of a flange portion of the waveguide.

FIG. 9 is a perspective view showing a conventional connection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waveguide (flanged tube) 2 ... Flange 3 ... Connection hole 4 ... Connection tool 5 ... Screw shaft 6, 16, 19, 20 ... Engaging member 7 ... Tightening member 8 ... Locking groove 18 ... Engagement Stop hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16B 7/18 F16B 35/00-35/06 H01P 1/04

Claims (2)

(57) [Claims] A tool for connecting flanges of pipes to each other, wherein the screw shaft is inserted through a plurality of connection holes provided in the respective flanges, and has a locking groove or a locking hole at one end. An engagement member that individually fits into a locking groove or a locking hole of each screw shaft, and that engages with an edge of the flange to regulate rotation of the screw shaft around its axis; And a fastening member screwed to the other end of the screw shaft at a position sandwiching both flanges with the member to fasten the flanges to each other. 2. A device for connecting flanges of pipes, said screw shaft being inserted into a plurality of connection holes provided in each flange, each having a locking groove or a locking hole at one end. An engaging member that restricts the rotation of the screw shafts around the axis by fitting together into the locking grooves or holes of the several screw shafts. And a tightening member for screwing the flanges together by screwing to the other ends of the screw shafts at the sandwiched position, respectively.