JP6739394B2 - Branch pipe fitting - Google Patents

Description

INDUSTRIAL APPLICABILITY The present invention is a temporary pipe used when renewing or repairing a water supply pipe laid in a multi-storey building such as a condominium, a buried pipe used for waterworks and civil engineering, an air conditioning facility or a building facility. A pipe member that forms a pipe used for, etc., in particular, a housing-type member capable of connecting the end portions of the pipe member having an annular collar portion formed on the outer peripheral surface of the end portion to each other in a butt shape and connecting a branch pipe. The present invention relates to a branch pipe joint.

Generally, flanged pipe members are used for temporary pipes used for renewal work of water supply pipes and buried pipes used for water supply works. As the piping member with the collar, there are a straight pipe, a branch joint (cheese), an elbow, a different diameter pipe (reducer), a short pipe, a flexible joint, an expansion pipe, and the like.

The flanged pipe member is one in which an annular flange portion is integrally formed on the outer peripheral surface of the end portion, and the flange portions of the two pipe members to be connected are arranged to face each other, and the two pipes are made to face each other. This is a type in which a housing-type pipe joint is covered on the end of the member to prevent the flange portion of the pipe member from coming off by covering the flange of the pipe joint with the housing of the pipe joint, and the space between the pipe member and the housing is sealed with an annular packing.

Conventionally, as this type of housing-type pipe joint, a packing-integrated pipe joint previously developed by the applicant of the present application is known (see Patent Documents 1 and 2).

That is, the packing-integrated pipe joint 10 has a ring-shaped split packing 12 mounted in a split ring-shaped housing 11, and a pipe member P (a straight pipe) having an annular flange portion Pa formed on an outer peripheral surface of an end thereof. , Branch joints, elbows, etc.) can be easily connected in a short time.

By the way, when a pipe is branched using the packing integrated pipe joint 10, as shown in FIG. 20, a branch joint 13 is arranged between the pipe member P (straight pipe) and the pipe member P (straight pipe). Then, the piping member P (straight pipe) and the branch joint 13 are connected by the packing-integrated pipe joint 10, and the branch pipe (not shown) is connected to the branch joint 13.

However, when a branch joint is used for branching the pipe, there arises a problem that the number of connection points increases, it takes time to connect the pipe members P to each other, and a large number of packing-integrated pipe joints are required. ..

Therefore, in order to solve the above problem, a branch pipe joint in which a housing-type pipe joint and a branch joint are integrated has been developed and put into practical use (see Non-Patent Document 1).

That is, as shown in FIG. 21, the branch pipe joint is covered with the flange portions Pa of the two piping members P arranged to face each other, and has a semicircular shape that is engaged with the flange portions Pa of the piping member P. Of the upper housing 14 ′ and the lower housing 14 ″, and a tubular branch portion 14 a provided in the upper housing 14 ′ and having a branch flow passage to which a branch pipe is connected. The rubber annular packing 15 which is covered over the flange portion Pa of the two piping members P disposed in the above, and has a through hole formed at a position corresponding to the branch flow passage of the branch portion 14a, the upper housing 14', and The lower housing 14″ is provided with a tightening tool (not shown) including bolts and nuts for tightening and fixing both ends of the lower housing 14″.

Thus, in order to connect the two piping members P using the branch pipe joint, the flange portions Pa of the two piping members P arranged in opposition to each other are covered with the annular packing 15 straddling, The annular packing 15 and the flange portion Pa of the two piping members P are covered with the upper housing 14' and the lower housing 14", and both ends of the upper housing 14' and the lower housing 14" are fastened with a tightening tool. Thus, the two pipe members P can be connected in an airtight state and in a butt shape.

Since the branch pipe joint includes a tubular branch portion 10a to which a branch pipe (not shown) is connected to the upper housing 14', the branch joint 13 is arranged between the pipe member P and the pipe member P. Even if it is not provided, there is an advantage that the pipe can be branched, the number of connecting points can be reduced, and the number of packing-integrated pipe joints 10 can be reduced.

By the way, when two pipe members P are connected using the branch pipe joint or the packing integrated pipe joint 10, the two pipe members P facing each other so as to absorb expansion and contraction, bending, and bending of the pipe. A gap is provided between the end faces. Further, in the case of the branch pipe joint, the water in the pipe member P is allowed to flow from the gap between the end faces of the two pipe members P to the branch pipe through the branch flow passage of the tubular branch portion 10a. (See FIG. 21(a)).

However, in the branch pipe joint, the pipe member P is not fixed to the housing 14 of the branch pipe joint, and the gap between the end faces of the two pipe members P facing each other is as small as several mm. The member P may move and the gap between the end faces of the two opposing pipe members P may be narrowed. In this case, there is a problem that a sufficient amount of water cannot be secured.
In particular, when the end faces of two pipe members P facing each other have abutted against each other, there is a problem that water does not flow to the branch pipe side and there is no water (see FIG. 21(b)). ).

In addition, in order to secure a sufficient amount of water, the width of the annular housing 14 may be widened to increase the gap between the end faces of the two opposing piping members P. In this case, the piping of the annular packing 15 is used. Since the area of the member P exposed in the flow path becomes large, when the pressure in the flow path becomes negative, the annular packing 15 bulges and deforms in the flow path so as to be peeled from the inner peripheral surface of the annular housing 14, and the seal is formed. There is a risk that the sex will be greatly impaired.

Further, in the branch pipe joint, since the collar packing Pa of the two pipe members P arranged opposite to each other is covered by the annular packing 15, the annular packing 15 itself has the branch portion 14a. There was a problem that the through hole 15a communicating with the branch flow passage had to be formed, and the number of processing steps increased.

JP, 2014-119939, A JP, 2014-202242, A

Product information/construction (branch joint S type/G type) on the website of Japan Victory Co., Ltd., [Search April 27, 2017], Internet <URL: http://www.victaulic.co.jp/ >

The present invention has been made in view of such a problem, and an object thereof is to ensure a sufficient amount of water on the branch side even if two pipe members to be connected move in the axial direction, It is an object of the present invention to provide a branch pipe joint that does not need to form a branch through hole that communicates with the packing into the branch pipe.

In order to achieve the above object, the branch pipe joint according to the present invention includes both flanges and respective flanges of two piping members which are arranged in an opposed manner and each of which has an annular flange on the outer peripheral surface of the end. The outer peripheral surface of the pipe member adjacent to the portion is covered with a rectangular frame-shaped packing insertion groove on the outer peripheral edge of the inner surface, and a portion surrounded by the rectangular frame-shaped packing insertion groove. A split annular housing composed of a semicircular upper housing and a lower housing, each of which has a semicircular flange accommodating recess whose both ends accommodate two flanges of two piping members opposed to each other. And a cylindrical branch portion provided in the upper housing or the lower housing and having a branch flow passage to which the branch pipe is connected, and inserted into the packing insertion groove of the upper housing and the lower housing, respectively, and face each other. A rectangular frame shape in a plan view and a half shape in a side view, which seal airtightly between the outer peripheral surface adjacent to the flange portions of the two pipe members and the annular housing and between the upper housing and the lower housing, respectively. A branch pipe joint comprising: an annular split packing composed of two arc-shaped semicircular packings; and a tightening tool for fastening and fixing the upper housing and the lower housing in a radial contraction direction, wherein the upper housing and the lower housing A pair of stopper portions each having a contact surface that restricts the movement of the two piping members toward each other by abutting the respective end surfaces of the two piping members on the inner peripheral surfaces of both the collar housing recesses of the side housing, respectively. The pair of stopper portions of the upper housing and the pair of stopper portions of the lower housing, which are provided to face each other, are formed in a semicircular arc shape along the circumferential direction of the upper housing and the lower housing, respectively. It has a ring shape when the housings face each other, and the distance between the contact surface of each stopper portion and the inner side surfaces of the flange housing recesses of the upper housing and the lower housing facing each contact surface is two pipes. It is characterized in that the width is set to be larger than the widths of the flange portions of the two piping members so that the members can move in the axial direction .

It is preferable that the dimension between the contact surfaces where the end surfaces of the two piping members of the stopper portion contact each other is set to a dimension that can sufficiently secure the amount of water flowing into the branch pipe.

The branch pipe joint according to the present invention, the inner peripheral surface of the flange housing recess of both the upper housing and the lower housing, or the inner peripheral surface of any one of the flange housing recesses, each end surface of the two piping members. Since the stopper portion having the contact surface that abuts and regulates the movement of the two pipe members in the approaching direction is provided, even if the two pipe members arranged so as to face each other move in the approaching direction, the stopper portion By this, the movement of the two piping members in the axial direction is restricted, and it is possible to prevent the end surfaces of the two piping members from abutting against each other.
As a result, the branch pipe joint according to the present invention does not cause a problem that water does not come out when the two pipe members move in the direction in which they approach each other like the conventional branch pipe joint does not cause a branch. Water can be reliably flowed to the pipe side.

Further, in the branch pipe joint according to the present invention, the dimension between the contact surfaces where the end surfaces of the two piping members of the stopper portion contact each other is set to a dimension that can sufficiently secure the amount of water flowing into the branch pipe. Even if the end surfaces of the two pipe members come into contact with the contact surface of the stopper portion, a sufficient amount of water can be secured on the side of the branch pipe.

Further, in the branch pipe joint according to the present invention, the distance between the inner side surface of the flange accommodating recess of the upper housing and the lower housing and the contact surface of the stopper portion facing the inner side surface is set so that the two pipe members are arranged in the axial direction. Since the width of the flanges of the two piping members is set to be larger than that of the two piping members, expansion and contraction, bending, and bending of the piping can be absorbed when the two piping members are connected.

In addition, in the branch pipe joint according to the present invention, the annular packing is composed of two semicircular packings having a square frame shape in a plan view and a semicircular arc shape in a side view, and the two semicircular packings are two. Since the outer peripheral surface adjacent to the flange portion of the piping member and the annular housing are hermetically sealed, a state in which the annular packing is straddled over the flange portions of the two piping members arranged opposite to each other. It is not necessary to form a through hole for branching in the annular packing, unlike the conventional branching pipe joint that is covered with the above, and the number of processing steps and the cost can be reduced.

FIG. 3 is a front view of the branch pipe joint according to the embodiment of the present invention, in which the upper housing and the lower housing are closed. Similarly, it is a front view of the branch pipe joint, showing the branch pipe joint, with the upper housing and the lower housing being opened. Similarly, it is a top view of a branch pipe joint. It is a left side view of the pipe joint for branching similarly. It is a right view of the branch pipe joint similarly. It is an AA line expanded sectional view of FIG. It is a top view of a branch pipe joint in a state where an upper housing and a lower housing are opened. FIG. 8 is a sectional view taken along line BB of FIG. 7. It is a top view of the housing in the state where the upper housing and the lower housing were opened. It is CC sectional view taken on the line of FIG. It is a front view of a split packing. It is a side view of a split packing. It is a top view of a split packing. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. FIG. 6 is a plan view showing a procedure for connecting piping members using a branch pipe joint, and showing a state in which the flange portions of two pipe members to be connected are inserted into a flange housing recess of a lower housing. FIG. 7 is a front view of the branch pipe joint in a state where the flanges of the two pipe members are covered with the upper housing and tightened and fixed by the tightening tool. It is the GG line expanded sectional view of FIG. It is sectional drawing which shows the state which connected two piping members using the conventional packing integrated pipe joint and a branch joint. The state which connected two piping members using the conventional branch pipe joint is shown, (a) is sectional drawing of the branch pipe joint in the state where water flows to the branch side from the clearance gap between piping members, ( b) is a cross-sectional view of the branch pipe joint in a state where the tips of the two piping members abut each other and water does not flow to the branch side.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 8 show a branch pipe joint according to an embodiment of the present invention. The branch pipe joint is used, for example, when renewing or repairing a water supply pipe laid in a multi-storey building. A pipe member P for forming a temporary pipe used for the above, a buried pipe used for a water supply work, a civil engineering work, and the like, in particular, two pipe members P (a straight pipe, a branch joint, which have an annular flange portion Pa formed on the outer peripheral surface of the end). Elbows, different diameter pipes (, short pipes, flexible joints, expansion pipes, etc.) can be connected to each other in a butt shape, and a branch pipe can be connected. It is formed on the pipe joint.

That is, as shown in FIGS. 1 to 8 and FIGS. 17 to 19, the branch pipe joint is provided with both the flange portions Pa of the two opposing pipe members P and the pipe member P adjacent to each flange portion Pa. A rectangular frame-shaped packing insertion groove 1g is formed on the outer peripheral edge of the outer peripheral surface portion, and a portion surrounded by the rectangular frame-shaped packing insertion groove 1g is opposed. A split annular ring composed of a semi-circular upper housing 1'and a lower housing 1", each of which has a semi-circular flange accommodating recess 1h with both ends for accommodating both flanges Pa of one piping member P formed. Of the upper housing 1 ′ or the lower housing 1 ″, and a cylindrical branch portion 1 b having a branch flow passage to which the branch pipe 5 is connected, and the upper housing 1 ′ and the lower housing 1 ″. Between the outer peripheral surface adjacent to the flange portion Pa of the two piping members P and the annular housing 1, which are respectively inserted into the packing insertion groove 1g and faced each other, and between the upper housing 1′ and the lower housing 1″. An annular split packing 2 composed of two semi-circular packings 2'having a rectangular frame shape in a plan view and a semi-circular arc shape in a side view, which seals the spaces in an airtight manner, an upper housing 1'and a lower housing 1 A connecting pin 3 that rotatably connects one ends of the upper housing 1 ′ and a tightening tool 4 that fastens and fixes the other ends of the upper housing 1 ′ and the lower housing 1 ″ in the diameter reducing direction.

The upper housing 1 ′ and the lower housing 1 ″ that form the annular housing 1 are each formed in a semicircular shape from a non-ferrous or synthetic resin material such as stainless cast steel, ductile cast iron, aluminum alloy or copper alloy, The upper housing 1 ′ and the lower housing 1 ″ are configured to have an annular shape when the both end surfaces are abutted with each other.

Specifically, the upper housing 1'is formed of a stainless cast steel product (SCS13) as shown in FIGS. 1 to 10, and covers the flange portions Pa of both of the two pipe members P facing each other. A semicircular arc-shaped housing part 1a, a cylindrical branch part 1b provided in the arc-shaped housing part 1a and having a branch flow passage to which the branch pipe 5 is connected, and an inner circumference of the arc-shaped housing part 1a The stopper portion 1c provided on the surface and having the contact surface 1c' for restricting the movement of the two piping members P in the approaching direction by contacting the respective end surfaces of the two piping members P, and the arc-shaped housing portion 1a. A bifurcated connecting piece 1d which is continuously provided on the outer peripheral surface of one end and protrudes outward, and a bifurcated fastening piece 1e which is continuously provided on the outer peripheral surface of the other end of the arc-shaped housing portion 1a and protrudes outward. Equipped with.

The branch portion 1b of the upper housing 1'is continuously provided at the center of the arc-shaped housing portion 1a so as to project outward, and the inner peripheral surface of the branch portion 1b is provided with the outer periphery of the end portion of the branch pipe 5. A female screw 1f is formed to which the male screw 5a formed on the surface is detachably attached. The branch pipe 5 may be directly connected to the branch portion 1b, or the branch pipe 5 may be connected via an adapter (not shown) such as a nipple.

Further, as shown in FIG. 9, the inner peripheral edge portion of the upper housing 1'(both ends of the inner peripheral surface of the arc-shaped housing portion 1a and both end surfaces of the arc-shaped housing portion 1a) has a rectangular frame shape in plan view. A packing insertion groove 1g is formed.

Further, the inner peripheral surface (the inner surface of the arc-shaped housing portion 1a) surrounded by the rectangular frame-shaped packing insertion groove 1g of the upper housing 1'(the inner surface of the arc-shaped housing portion 1a) has both flange portions Pa of the two piping members P facing each other. Is formed in a semicircular flange accommodating recess 1h whose both ends are open along the circumferential direction from one end face to the other end face of the arc-shaped housing part 1a.

As shown in FIGS. 9 and 10, the stopper portion 1c of the upper housing 1'is continuously provided so as to project inwardly on the inner peripheral surface of the flange accommodating recess 1h of the upper housing 1'. It is formed in a semi-circular shape along the circumferential direction of the housing 1'.

In this embodiment, a pair of stopper portions 1c are provided on the inner peripheral surface of the flange accommodating recess 1h of the upper housing 1'with a constant space in the width direction of the upper housing 1'(left and right direction in FIG. 9). The outer side surface of each stopper portion 1c is a contact surface 1c' that abuts on each end surface of the two piping members P, respectively.

The dimension L between the contact surfaces 1c' where the end surfaces of the two pipe members P of the two stopper portions 1c contact each other is such that the end surfaces of the two pipe members P contact the contact surfaces 1c' of the two stopper portions 1c, respectively. Even when they come into contact with each other, the distance between the end faces of the two pipe members P is kept constant, and the size is set so that a sufficient amount of water flowing into the branch pipe 5 can be secured (see FIG. 19).

The distance W between the contact surface 1c' of the two stopper portions 1c and the inner side surface 1h' of the flange accommodating recess 1h of the upper housing 1'opposed to each contact surface 1c' is such that the two pipe members P are in the axial direction. The width is set to be larger than the widths of the flange portions Pa of the two piping members P so that they can be moved to (see FIG. 19).

On the other hand, the lower housing 1″ is formed of a stainless cast steel product (SCS13) as shown in FIGS. 1 to 10, and is covered with both flange portions Pa of two pipe members P facing each other. The semicircular arc-shaped housing portion 1a and the inner peripheral surface of the arc-shaped housing portion 1a are provided, and the respective end surfaces of the two piping members P are in contact with each other to move the two piping members P in the approaching direction. A stopper portion 1c having a restricting contact surface 1c' and a bifurcated connection which is continuously provided on the outer peripheral surface of one end of the arc-shaped housing portion 1a and protrudes outward to be inserted between the connection pieces 1d of the upper housing 1'. It has a piece 1d and a bifurcated tightening piece 1e which is continuously provided on the outer peripheral surface of the other end of the arc-shaped housing portion 1a and which projects outward and contacts the tightening piece 1e of the upper housing 1'.

Further, as shown in FIG. 9, a rectangular frame shape is formed on the inner peripheral edge portions of the lower housing 1″ (both ends of the inner peripheral surface of the arc-shaped housing portion 1a and both end surfaces of the arc-shaped housing portion 1a). The packing insertion concave groove 1g is formed.

Further, on the inner peripheral surface (the inner surface of the arc-shaped housing portion 1a) surrounded by the rectangular frame-shaped packing insertion concave groove 1g of the lower housing 1″ (both flange portions of two pipe members P opposed to each other). A semicircular flange accommodating concave portion 1h, in which Pa is accommodated and whose both ends are open, is formed along the circumferential direction from one end face of the arc-shaped housing part 1a to the other end face thereof.

In addition, the upper housing 1'is tightened when both end surfaces of the upper housing 1'and the lower housing 1" are butted to the outer surface of the base end portion of the bifurcated tightening piece 1e of the lower housing 1". Positioning protrusions 1i are formed so as to be engaged with both side surfaces of the piece 1e to position the upper housing 1'and the lower housing 1".

As shown in FIGS. 9 and 10, the stopper portion 1c of the lower housing 1″ is continuously provided so as to project inwardly to the inner peripheral surface of the flange accommodating recess 1h of the lower housing 1″. , Is formed in a semi-circular shape along the circumferential direction of the lower housing 1″.

In this embodiment, the stopper portions 1c are paired with each other on the inner peripheral surface of the collar housing recess 1h of the lower housing 1″ at regular intervals in the width direction of the lower housing 1″ (left-right direction in FIG. 9). The outer side surface of each stopper portion 1c is a contact surface 1c' that abuts on each end surface of the two piping members P. The two stopper portions 1c are formed on the inner peripheral surface of the flange housing recess 1h of the lower housing 1″ so as to face the two stopper portions 1c of the upper housing 1′. The stopper portion 1c of 1″ and the stopper portion 1c of the upper housing 1′ have a ring shape when the housings 1′ and 1″ face each other.

The dimension L between the contact surfaces 1c' where the end surfaces of the two pipe members P of the two stopper portions 1c contact each other is such that the end surfaces of the two pipe members P contact the contact surfaces 1c' of the two stopper portions 1c, respectively. Even when they come into contact with each other, the distance between the end faces of the two pipe members P is kept constant, and the size is set so that a sufficient amount of water flowing into the branch pipe 5 can be secured (see FIG. 19).

Further, the distance W between the contact surface 1c' of the two stopper portions 1c and the inner side surface 1h' of the collar housing recess 1h of the lower housing 1" facing each contact surface 1c' is such that the two pipe members P have an axis line. The width is set to be larger than the widths of the flange portions Pa of the two piping members P so as to be movable in the direction (see FIG. 19).

In the upper housing 1'and the lower housing 1" thus configured, the bifurcated connecting piece 1d of the upper housing 1'is inserted between the bifurcated connecting pieces 1d1b of the lower housing 1" to connect them. The connecting pin 3 is inserted into the piece 1d and is prevented from coming off by the bush nut 6, so that the piece is connected rotatably.

In the above embodiment, the upper housing 1′ and the lower housing 1″ are provided with the two semi-circular stopper portions 1c, respectively, but in other embodiments, the upper housing 1′ and the lower housing 1′ are provided. It is also possible to provide one wide semicircular stopper portion 1c on the side housing 1″, and form side surfaces on both sides of the stopper portion 1c as a contact surface 1c′ with which the end surfaces of the two piping members P abut.

Further, in the above embodiment, the stopper portions 1c of the upper housing 1'and the lower housing 1" are formed in a semi-circular shape, but the shape of the stopper portion 1c is not limited to that according to the above embodiment. Instead, any shape and structure may be used as long as the end faces of the two opposing pipe members P are in contact with each other to restrict the movement of the two pipe members P in the approaching direction. The portion 1c may be formed in a protrusion shape (not shown) protruding inward of the upper housing 1'and the lower housing 1".

Each of the two semi-circular packings 2 ′ forming the annular split packing 2 is formed of synthetic rubber such as nitrile rubber (NBR) into a square frame shape in a plan view and a semi-arcuate shape in a side view. The two semi-circular packings 2'are formed into an annular shape when the end surfaces of the two packings are abutted with each other.

Specifically, the two semicircular packings 2 ′ are formed of ethylene propylene diene rubber (EPDM) in the same shape and the same size as shown in FIGS. 6 to 8 and 11 to 16. And a pair of semi-circular arcs which are respectively attached to the inner housing surface 1a of the arc-shaped housing portion 1a of the packing insertion groove 1g of the upper housing 1'and the lower housing 1". The pair of arc portions 2a are connected to the outer surfaces of both ends of the pair of arc portions 2a so as to project outward, connect both end portions of the pair of arc portions 2a, and connect the upper housing 1′ and the lower housing 1″. A pair of planar U-shaped connecting portions 2b which are respectively inserted into portions of the packing insertion groove 1g located on both end surfaces of the arc-shaped housing portion 1a, and arc portions on the inner peripheral surfaces of the pair of arc portions 2a. Lip portions 2c each having a tapered cross-sectional shape, which are formed to project in the radial direction of 2a and are pressed into close contact with the outer peripheral surface portions of the pair of opposed piping members P adjacent to each flange portion Pa, and each arc. It is formed at a boundary portion between both end positions of the inner peripheral surface of the portion 2a and both end surfaces of the arc portion 2a so as to be continuous with the lip portion 2c, and when the two end surfaces of the two semicircular packings 2'are butted to each other, the lip portion A rectangular parallelepiped tongue portion 2d which prevents the both end portions of 2c from being largely deformed and maintains the airtightness of the butting surfaces of the semicircular packing 2', and is formed along the arc portion 2a on the outer peripheral surface of the pair of arc portions 2a. And the concave groove 2e.

As shown in FIGS. 2 and 8, these two semi-circular packings 2′ are inserted into the packing insertion groove 1g of the upper housing 1′ and the lower housing 1″, respectively. At this time, both end surfaces of both semicircular packings 2'project from both end surfaces of the upper housing 1'and the lower housing 1".

Further, both end surfaces of the circular arc portion 2a of the two semi-circular packings 2'are upwardly inclined from the outer side to the inner side (inclined surface in a state where the inner portion projects in the circumferential direction more than the outer portion). Is formed in.

Further, the inner diameters of the two semicircular packings 2'are formed to be smaller than the outer diameter of the flange portion Pa of the pipe member P to be connected.

As shown in FIGS. 1 to 3, the tightening tool 4 is swingably connected between the fastening pieces 1e of the lower housing 1″ via rivet pins 7 and is inserted between the fastening pieces 1e of the upper housing 1′. The bolt 4a and the nut 4b screwed to the bolt 4a. The bolt 4a is inserted between the tightening pieces 1e of the upper housing 1'and the nut 4b screwed to the bolt 4a is tightened. The other ends (the fastening pieces 1e) of the upper housing 1′ and the lower housing 1″ can be fastened and fixed.

Next, a case will be described in which the two pipe members P having the flange portion Pa formed by using the branch pipe joint described above are connected in a butt shape and the branch pipe 5 is connected to the branch pipe joint.

First, it is confirmed whether the semicircular packing 2'is securely inserted in the packing insertion groove 1g of the upper housing 1'and the lower housing 1", and the two pipe members P to be connected are not damaged. Check that there is no foreign matter, and do not use if there is a significant damage to the piping member P.

Next, a lubricant is applied to the two semicircular packings 2', the upper housing 1'and the lower housing 1" are opened, and the flange portions Pa of the two piping members P to be connected are connected to the flange of the lower housing 1". It is inserted into the part housing recess 1h (see FIG. 17).

After that, the two pipe members P to be connected are made horizontal, and both end faces of the pipe member P are opposed to each other, and while keeping this state, the upper housing 1'is covered on the flange portion Pa of the opposed pipe member P.

Finally, the upper housing 1'and the lower housing 1" are tightened and fixed in the diameter reducing direction by the tightening tool 4 (see FIG. 18). At this time, both end surfaces of the upper housing 1'and the lower housing 1" come into contact with each other. Tighten with the tightening tool 4. Further, it is confirmed whether or not the positioning protrusion 1i is in contact with one end surface of the upper housing 1'.

Then, the inner side surface 1h' of the flange accommodating recess 1h of the upper housing 1'and the lower housing 1" is locked to the inner side surface of the flange portion Pa of the opposed piping member P, and both piping members P branch. The annular split packing 2 is pressed against the outer peripheral surface of the pipe member P facing each other adjacent to each flange portion Pa in close contact with the upper housing 1'. An annular split packing 2 seals between both end surfaces of the housing 1 ″. As a result, both pipe members P are airtightly connected (see FIG. 19).

When the two pipe members P facing each other are connected by the branch pipe joint, the tip portion of the branch pipe 5 is screwed to the branch portion 1b of the branch pipe joint.

In the branch pipe joint described above, the respective end surfaces of the two piping members P are in contact with the inner peripheral surfaces of the flange housing recesses 1h of the upper housing 1'and the lower housing 1" so that the two piping members P are close to each other. Since the stopper portions 1c each having the contact surface 1c' for restricting the movement in the direction are provided respectively, even if the two pipe members P arranged facing each other move toward each other, the stopper portion 1c causes the two pipes The movement of the member P in the axial direction is restricted, and it is possible to prevent the end faces of the two piping members P from abutting against each other.
As a result, if the branch pipe joint is used, the two pipe members P are not fixed, and even if they move in the directions in which they are close to each other, there is no problem that water does not come out, and the branch pipe Water can be surely flowed to the 5 side.

Further, in the branch pipe joint, the dimension L between the contact surfaces 1c' where the end faces of the two piping members P of the stopper portion 1c contact each other is set to a size that can secure a sufficient amount of water flowing into the branch pipe 5. Therefore, even if the end surfaces of the two piping members P abut on the contact surface 1C' of the stopper portion 1c, a sufficient amount of water can be secured on the side of the branch pipe 5.

Further, the branch pipe joint has a space W between the inner side surface 1h' of the collar housing recess 1h of the upper housing 1'and the lower housing 1" and the contact surface 1c' of the stopper portion 1c facing the inner side surface 1h'. Is set to be larger than the width of the flange portion Pa of the two piping members P so that the two piping members P can move in the axial direction. Therefore, when the two piping members P are connected, expansion and contraction and bending of the piping are performed. It is possible to absorb bending and the like.

Further, in the branch pipe joint, the annular packing is composed of two semicircular packings 2'having a square frame shape in a plan view and a semicircular arc shape in a side view, and the two semicircular packings 2'are two pipes. Since the outer peripheral surface adjacent to the flange portion Pa of the member P and the annular housing 1 are hermetically sealed, an annular packing is provided on the flange portion Pa of the two pipe members P arranged opposite to each other. There is no need to form a through hole for branching in the annular packing, unlike the conventional branching pipe joint that is put over in a state of straddling over, and the number of processing steps can be reduced and the cost can be reduced.

Further, the branch pipe joint uses split packing that is split in two in the diameter direction, and has a configuration in which the split packing and the split housing are integrated, so when connecting the two piping members P, an annular packing is used. As in the conventional pipe joint using the above, the flange portions Pa of the two piping members P are butted against each other and the center positions (axial center positions) of the two piping members P are aligned to keep the two piping members P in a horizontal posture. Thus, it is not necessary to evenly cover the flange portions Pa that are abutted while the packing is extended and expanded, and the connecting work of the pipe member P can be performed easily and easily in a short time.

Further, since the branch pipe joint is configured to integrate the split packing and the housing, when the housing is attached to the flange portion Pa where the piping member P is abutted, a construction error such as biting of the packing does not occur, The cause of water leakage disappears.

Further, in the branch pipe joint, when the two pipe members P are connected, the flange portions Pa of the two pipe members P are respectively inserted into the flange portion receiving recesses 1h of the lower housing 1″, so that both pipe members P are connected. Since the upper housing 1'and the lower housing 1" are simply tightened with the tightening tool 4 by placing the upper housing 1'on the flange portions Pa of both the piping members P with the upper housing 1'horizontally arranged, the long piping member P and the heavy piping member P It is not necessary to hold the cable for a long time, and it is possible to easily connect in a short time even for piping work on uneven work sites or in the air.

Further, in the branch pipe joint, the annular split packing 2 comes into close contact with the outer peripheral surface portion adjacent to the flange portion Pa of the pipe member P where scratches and foreign matter (dust, sand, dust, etc.) are unlikely to occur. Therefore, the sealing performance is superior to the conventional pipe joint that seals on the outer peripheral surface of the flange portion Pa of the piping member P that is easily damaged.

Furthermore, in the branch pipe joint, since both end surfaces of both semicircular packings 2'project from both end surfaces of the upper housing 1'and the lower housing 1", respectively, the upper housing 1'and the lower housing 1" are When tightened and fixed, the portions of both the semicircular packings 2'protruding from both end surfaces of the upper housing 1'and the lower housing 1" are strongly pressed and tightly adhered to each other so that the semicircular packings 2'protrude. The mating surfaces can be reliably and satisfactorily sealed.
In particular, since both end surfaces of the arc portion 2a of the two semicircular packings 2'are formed into inclined surfaces that are inclined upward from the outer side to the inner side, the inner portions of the both end surfaces of the arc portion 2a are more than the outer portion. Even more strongly, the airtightness of the abutting surfaces of the two semicircular packings 2'can be reliably maintained.

Further, since the branch pipe joint is provided with the positioning protrusion 1i that is locked to the upper housing 1'on the lower housing 1", the upper housing 1'and the lower housing 1" are accurately positioned. As a result, the two end faces of the two split packings are also accurately and surely abutted to each other for reliable sealing.

In the above embodiment, one ends of the upper housing 1'and the lower housing 1" are rotatably connected by the connecting pin 3, and the other ends of the upper housing 1'and the lower housing 1" are connected. Although the fastening members 4 are used to fasten and fix each other, in other embodiments, the other ends of the upper housing 1'and the lower housing 1" are also fastened to each other with the fastening device 4 although not shown. You may do it.

In the above embodiment, the upper housing 1'and the lower housing 1" are made of stainless cast steel, but in other embodiments, the upper housing 1'and the lower housing 1" are made of other materials, For example, it may be made of ductile cast iron, a non-ferrous alloy such as an aluminum alloy or a copper alloy, or a synthetic resin material.

In the above-described embodiment, the annular split packing 2 is made of synthetic rubber, but in other embodiments, the split packing is made of synthetic resin material such as natural rubber or Teflon (registered trademark). May be.

In the above embodiment, the branch portion 1b is provided in the upper housing 1', but in another embodiment, the branch portion 1c may be provided in the lower housing 1", or the upper housing 1'. The branch portion 1c may be provided on both the lower housing 1″ and the lower housing 1″.

In the above-described embodiment, the stopper portions 1c having the contact surfaces 1c' are provided on the inner peripheral surfaces of the flange accommodating recesses 1h of both the upper housing 1'and the lower housing 1", respectively. In this embodiment, the stopper portion 1c having the contact surface 1c' may be provided on the inner peripheral surface of the flange housing recess 1h of either the upper housing 1'or the lower housing 1".

1 is an annular housing, 1'is an upper housing, 1" is a lower housing, 1a is an arc-shaped housing part, 1b is a branch part, 1c is a stopper part, 1c' is a contact surface, 1d is a connecting piece, and 1e is a tightening part. One piece, 1f is a female screw of a branch portion, 1g is a groove for inserting a packing, 1h is a concave portion for receiving the flange portion, 1h' is an inner side surface of the concave portion for receiving the flange, 1i is a positioning protrusion, 2 is an annular split packing, 2'. Is a semi-circular packing, 2a is an arcuate portion, 2b is a U-shaped connecting portion, 2c is a lip portion, 2d is a tongue portion, 2e is a groove, 3 is a connecting pin, 4 is a tightening tool, 4a is a bolt, 4b. Is a nut, 5 is a branch pipe, 5a is a male screw of the branch pipe, 6 is a bush nut, 7 is a rivet pin, P is a piping member, Pa is a flange portion, L is a dimension between contact surfaces, W is a contact surface and a flange. The distance from the inner side surface of the part housing recess.

Claims (2)

Both of the flange portions (Pa) of the two piping members (P), which are arranged to face each other and each of which has an annular flange portion (Pa) formed on the outer peripheral surface of the end, and a piping member adjacent to each of the flange portions (Pa). (P) is covered with the outer peripheral surface portion, and a rectangular frame-shaped packing insertion groove (1 g) is formed on the inner peripheral edge portion, and is surrounded by the rectangular frame-shaped packing insertion groove (1 g). Of the two piping members (P) opposed to each other, the semi-circular upper side having the semi-circular flange accommodating recesses (1h) open at both ends. A ring-shaped housing (1) divided into a housing (1') and a lower housing (1") and an upper housing (1') or a lower housing (1") are provided, and a branch pipe (5) is connected to the housing. And a cylindrical branch portion (1b) having a branch flow passage formed therein and the packing insertion groove (1g) of the upper housing (1′) and the lower housing (1″), respectively, so as to face each other. The outer peripheral surfaces of the two pipe members (P) adjacent to the flange portions (Pa) and the annular housing (1) and the upper housing (1′) and the lower housing (1″) are hermetically sealed. An annular split packing (2) composed of two semi-circular packings (2′) that are square frame-shaped in plan view and semi-circular arc-shaped in side view, and an upper housing (1′) and a lower housing ( A branch pipe joint including a tightening tool (4) for tightening and fixing 1″) in a diameter reducing direction, wherein the flange housing recesses of both the upper housing (1′) and the lower housing (1″). A pair of contact surfaces (1c') are provided on the inner peripheral surface of (1h), with which the end surfaces of the two piping members (P) are in contact with each other to restrict the movement of the two piping members (P) in the approaching direction. The stopper portions (1c) are provided so as to face each other, and the pair of stopper portions (1c) of the upper housing (1′) and the pair of stopper portions (1c) of the lower housing (1″) respectively correspond to the upper housing (1c). 1') and the lower housing (1") are formed in a semi-circular shape along the circumferential direction, and have a ring shape when the upper housing (1') and the lower housing (1") are opposed to each other, and , Inside of the flange receiving recess (1h) of the upper housing (1') and the lower housing (1") facing the contact surface (1h') of each stopper portion (1c) and each contact surface (1h'). The distance (W) from the side surface (1h′) is set to be larger than the width of the flange portion (Pa) of the two piping members (P) so that the two piping members (P) can move in the axial direction. A pipe joint for branching characterized by being specified . The dimension (L) between the contact surfaces (1c') where the end surfaces of the two piping members (P) of the stopper portion (1c) contact each other is such that a sufficient amount of water flowing into the branch pipe (5) can be secured. The branch pipe joint according to claim 1, which is set.

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