JP7270898B2 - Resin tee joint - Google Patents

Description

The present invention relates to a resin tee joint.

Non-Patent Document 1 discloses a "WPT1 type cheese socket (hereinafter referred to as a resin cheese joint)" used for branching water supply pipes. As shown in FIG. 5, the resin cheese joint 200 includes a T-shaped joint body 201 made of resin. The joint main body 201 includes a first straight portion 211 to a third straight portion 213 and a branch portion 214 . The branch portion 214 connects the first straight portion 211 to the third straight portion 213 to each other.

The first pipe 311 connected to the first straight portion 211 and the second pipe 312 connected to the second straight portion 212 are of the same size and have the same inner diameter (for example, nominal diameter "16A"). ). The third pipe 313 connected to the third straight portion 213 has a size smaller than that of the first pipe 311 and the second pipe 312 and has a small inner diameter (for example, nominal diameter "13A").

In the resin tee joint 200, the use of branching into the second straight portion 212 and the third straight portion 213 with the first straight portion 211 on the upstream side is so-called "dragonfly piping", and the pressure loss at the branch portion 214 is is generally considered to be better to avoid.

Onda Manufacturing Co., Ltd. "General Catalog 2017-2018", page 84

However, in the case of a construction site where the piping route is greatly restricted, such as remodeling of water supply pipes, the actual situation is that the resin cheese joint 200 is often used as dragonfly piping. Therefore, the pressure loss is particularly large in the passage from the first straight portion 211 to the second straight portion 212 used as the main pipe. becomes a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin tee joint capable of reducing pressure loss caused by fluid passing through a branch in a main pipe.

In order to achieve the above object, the resin cheese joint of claim 1 is integrally formed with the first straight portion to the third straight portion so as to connect the first straight portion to the third straight portion to each other. A joint body made of resin having a branched portion, a first lock mechanism for retaining the first pipe connected to the first straight portion, and retaining the second pipe connected to the second straight portion. and a third locking mechanism for preventing the third pipe connected to the third straight portion from coming off, wherein the branch portion is arranged at right angles to the first straight portion and the third pipe. 2 straight portion, and a straight branched from the corner and connected to the third straight portion, and the inner peripheral surface of the first communicating port with the first straight portion at the corner , the inner peripheral surface of the vertex portion between the first straight portion and the second straight portion, and the inner peripheral surface of the second communication port with the second straight portion are each formed in a perfect circle, and the At corners, the inner peripheral surface of the first communication port and the inner peripheral surface of the vertex are smoothly connected, and the inner peripheral surface of the vertex and the inner peripheral surface of the second communication port are smoothly connected. and the straight is configured such that the axis of the straight is positioned closer to the first straight portion than the axis of the second straight portion.

According to the above configuration, at the corner of the branch portion, the inner peripheral surface is smoothly connected from the first communication port to the second communication port via the apex portion. Therefore, the pressure loss can be reduced particularly in the passage from the first straight portion to the second straight portion used as the main pipe, and even if dragonfly piping is frequently used, for example, insufficient flow rate at the terminal faucet is less likely to occur.

FIG. 2 is a vertical cross-sectional view of a resin tee joint; FIG. 2 is an enlarged view of a main portion of FIG. 1; The longitudinal cross-sectional view of the resin-made cheese joint of example of another. FIG. 10 is a vertical cross-sectional view of another example of resin cheese joint. FIG. 2 is a vertical cross-sectional view of a conventional resin-made cheese joint.

An embodiment of a resin tee joint will be described below with reference to the drawings.
As shown in FIG. 1, the resin cheese joint 1 connects a first pipe 101 on the upstream side of the hot water supply pipe and a second pipe 102 and a third pipe 103 on the downstream side in a T shape. belongs to. In other words, the resin tee joint 1 is used for branching a hot water supply pipe, and is a branch joint suitable for so-called "dragonfly piping". The first to third pipes 101 to 103 are made of synthetic resin such as polybutene or crosslinked polyethylene.

The resin cheese joint 1 includes a T-shaped joint body 11 made of resin. The joint main body 11 includes a first straight portion 21 to a third straight portion 23 and a branch portion 24 . The branch portion 24 is integrally formed with the first straight portion 21 to the third straight portion 23 so as to connect the first straight portion 21 to the third straight portion 23 with each other. As the resin forming the joint main body 11, for example, a mixture of polyphenylene sulfide resin and glass fiber can be used.

In the joint main body 11, the first straight portion 21 and the second straight portion 22 are formed in a cylindrical shape linearly extending in directions perpendicular to each other. A corner 31 forming the flow path of the branch portion 24 is formed in a cylindrical inner surface shape curved in an arc so as to connect the first straight portion 21 and the second straight portion 22 .

In the joint main body 11 , the third straight portion 23 is formed in a cylindrical shape coaxial with the second straight portion 22 and linearly extending in a direction perpendicular to the first straight portion 21 . The straight 32 forming the flow path of the branch portion 24 is formed in a cylindrical inner surface shape extending linearly so as to connect the outside of the corner 31 and the third straight portion 23 .

The first straight portion 21 is provided with a first locking mechanism 41 that prevents the first pipe 101 connected to the first straight portion 21 from coming off. The second straight portion 22 is provided with a second lock mechanism 42 that prevents the second pipe 102 connected to the second straight portion 22 from coming off. The third straight portion 23 is provided with a third lock mechanism 43 that prevents the third pipe 103 connected to the third straight portion 23 from coming off.

The first pipe 101 and the second pipe 102 have the same size and inner diameter (for example, nominal diameter "16A"). The third pipe 103 has a size smaller than that of the first pipe 101 and the second pipe 102 and has a smaller inner diameter (for example, nominal diameter "13A").

Therefore, corresponding to the size difference between the first pipe 101 and the second pipe 102 and the third pipe 103, the first straight portion 21 and the second straight portion 22, the third straight portion 23, and the first lock The mechanism 41 and the second locking mechanism 42 and the third locking mechanism 43 also have the same structure but different sizes. Therefore, for example, the third straight portion 23 has a smaller inner diameter than the first straight portion 21 and the second straight portion 22 , and the third locking mechanism 43 is more flexible than the first locking mechanism 41 and the second locking mechanism 42 . Small inner diameter.

Next, the structure of the resin cheese joint 1 will be described in detail.
As shown in FIG. 2, a first communication port 24a is provided at a boundary portion with the first straight portion 21 at the corner 31 of the branch portion 24 . A second communication port 24b is provided at a boundary portion with the second straight portion 22 at the corner 31 of the branch portion 24 . A third communication port 24 c is provided in the straight 32 of the branch portion 24 at a boundary portion with the third straight portion 23 . The first to third communication ports 24a to 24c have the same inner diameter.

On the inner peripheral surfaces of the first to third straight portions 21 to 23, accommodating portions 25 for accommodating the ends of the corresponding first to third pipes 101 to 103 are provided at portions near the branch portion 24. It is A stepped portion 26 is formed between the inner peripheral surface of each housing portion 25 and the inner peripheral surfaces of the corresponding first to third communication ports 24a to 24c in the branch portion 24, respectively. Each stepped portion 26 and the corresponding inner peripheral surfaces of the first communication port 24a to the third communication port 24c are substantially perpendicular to each other. The accommodating portion 25 of the third straight portion 23 has a smaller inner diameter than the accommodating portions 25 of the first straight portion 21 and the second straight portion 22 .

Cylindrical first to third inner cores 111 to 113 made of metal are inserted into the ends of the first to third pipes 101 to 103, respectively. The first to third inner cores 111 to 113 are inserted into the corresponding first to third pipes 101 to 103 by means of the flanges 111a to 113a formed at the ends of the first to third inner cores 111 to 113. Abutment is regulated. The first pipe 101 and the second pipe 102 are attached to the accommodation portion 25 of the corresponding first straight portion 21 or second straight portion 22 until the position where the corresponding first inner core 111 or second inner core 112 contacts the stepped portion 26. inserted.

The first inner core 111 inserted into the first pipe 101 and the second inner core 112 inserted into the second pipe 102 have the same inner diameter, and the inner diameter is the same for the first communication port 24a to the third communication port 24c. Same as inner diameter. The third inner core 113 inserted into the third pipe 103 has a smaller size than the first inner core 111 inserted into the first pipe 101 and the second inner core 112 inserted into the second pipe 102. It is smaller than the inner diameters of the first communication port 24a to the third communication port 24c. That is, the inner diameter of the third communication port 24c (straight 32) is larger than the inner diameter of the third pipe 103 (the inner diameter of the third inner core 113).

A cylindrical guide 27 is arranged in the accommodating portion 25 of the third straight portion 23 . The inner peripheral surface of the guide 27 has a tapered shape in which the inner diameter gradually decreases toward the third inner core 113 of the third pipe 103 (hereinafter referred to as a tapered surface 27a). The tapered surface 27a of the guide 27 has the same inner diameter as the third communication port 24c on the third communication port 24c side, and has the same inner diameter as the third inner core 113 on the third pipe 103 side. The third pipe 103 is inserted into the accommodation portion 25 of the third straight portion 23 to a position where the third inner core 113 contacts the stepped portion 26 via the guide 27 .

As shown in FIG. 1, on the inner peripheral surfaces of the first straight portion 21 to the third straight portion 23, between each accommodation portion 25 and the tip end portion of the corresponding first straight portion 21 to the third straight portion 23, are provided with seal portions 28 each having an inner diameter larger than that of the accommodating portion 25 . Inside each seal portion 28, a seal ring 51, a spacer 52, a seal ring 53, and a retaining ring 54 are arranged from the accommodation portion 25 side toward the tip end side of the corresponding first straight portion 21 to third straight portion 23. are arranged in order. The inner diameters of the seal ring 51, spacer 52, seal ring 53, and retaining ring 54 are larger than the inner diameters of those disposed in the first straight portion 21 and second straight portion 22. smaller.

When the end portions of the first to third pipes 101 to 103 are inserted into the accommodating portions 25 of the corresponding first to third straight portions 21 to 23, the first to third pipes 101 to 103 are secured to the seal ring. 51 , spacer 52 , sealing ring 53 and retaining ring 54 . At this time, the seal rings 51 and 53 of each seal portion 28 are in contact with the outer peripheral surfaces of the corresponding first to third pipes 101 to 103, and the water flowing through the joint main body 11 is prevented from flowing through the first to third pipes 101 to 103. Leakage to the outside of the resin cheese joint 1 from between the outer peripheral surface of the pipe 103 and the inner peripheral surface of the seal portion 28 is suppressed.

The first to third locking mechanisms 41 to 43 include holding members 44 for holding the corresponding first to third pipes 101 to 103 in the corresponding first to third straight portions 21 to 23; and a cap 45 for attaching the member 44 to the corresponding first to third straight portions 21 to 23 . The holding member 44 is provided with an annular lock ring 48 located between the fitting ring 46 and the split ring 47 . Each retaining member 44 is positioned adjacent a retaining ring 54 located on the corresponding seal portion 28 .

The cap 45 is cylindrically formed. By arranging the split ring 47 and the lock ring 48 inside the cap 45 and fitting the fitting ring 46 inside the cap 45 , the split ring 47 and the lock ring 48 do not come off from the inside of the cap 45 . In this state, the opening end of the cap 45 is engaged with the end portions of the corresponding first straight portion 21 to the third straight portion 23 at the portions overlapping the end portions in the radial direction. The first locking mechanism 41 to the third locking mechanism 43 each including the holding member 44 and the cap 45 are easily assembled to the portion 21 to the third straight portion 23, respectively.

With the first locking mechanism 41 to third locking mechanism 43 (holding member 44 and cap 45) attached to the corresponding first straight portion 21 to third straight portion 23, the first pipe 101 to third pipe 103 passes through the corresponding holding member 44 and the cap 45, and is inserted into the housing portion 25 from the distal ends of the corresponding first to third straight portions 21 to 23, the holding member 44 is locked. The ring 48 presses the outer peripheral surfaces of the corresponding first to third pipes 101 to 103 . This prevents the first to third pipes 101 to 103 from slipping out of the corresponding first to third straight portions 21 to 23 .

Next, the branch portion 24 of the joint body 11 will be described in detail.
As shown in FIG. 2, at the corner 31 of the branch portion 24, a vertex portion 24d is provided at an intermediate position between the first communication port 24a and the second communication port 24b. The inner peripheral surfaces of the first communication port 24a, the second communication port 24b, and the vertex portion 24d are each formed in a perfect circle shape. At the corner 31, the inner peripheral surface of the first communication port 24a and the inner peripheral surface of the vertex portion 24d are smoothly connected, and the inner peripheral surface of the second communication port 24b and the inner peripheral surface of the vertex portion 24d are connected. Connected smoothly.

The inner diameters of the first communication port 24a and the second communication port 24b are larger than the inner diameter of the vertex portion 24d. Therefore, the inner diameter of the corner 31 gradually increases from the vertex portion 24d toward the first communication port 24a, and gradually increases from the vertex portion 24d toward the second communication port 24b.

According to this embodiment having the above configuration, the following effects can be obtained.
(1) At the corner 31 of the branch portion 24, the inner peripheral surface is smoothly connected from the first communication port 24a to the second communication port 24b via the vertex portion 24d. Therefore, the pressure loss can be reduced particularly in the passage from the first straight portion 21 used as the main pipe to the second straight portion 22. Insufficient flow is less likely to occur.

(2) The inner diameter of the third communication port 24c (straight 32) is larger than the inner diameter of the third pipe 103 (the inner diameter of the third inner core 113). Therefore, the water flowing through the corner 31 can be guided to the third pipe 103 with a small pressure loss. That is, as shown by a two-dot chain line in FIG. The angle of the corner X formed on the inside of the connecting portion with is small.

Therefore, when water flows from the first straight portion 21 to the third straight portion 23, vortices are likely to occur around the corners X, resulting in increased pressure loss. On the other hand, in the present embodiment, since the corner X can be arranged closer to the first communication port 24a and the angle of the corner X becomes larger, the aforementioned vortex is less likely to occur.

(3) A guide 27 is arranged between the corner 31 of the branch portion 24 and the third pipe 103, and the guide 27 has a tapered surface 27a whose inner diameter gradually decreases toward the third pipe 103. there is Therefore, the water flowing through the corner 31 can be guided to the third pipe 103 more smoothly, which also contributes to reducing the pressure loss at the branch portion 24 .

<Extra example>
For example, the present invention can also be implemented in the following aspects.
・The guide 27 is removed so that the third inner core 113 is directly in contact with the stepped portion 26, and the inner peripheral surface of the flange 113a of the third inner core 113 is directed toward the inside of the third pipe 103. be a tapered surface that reduces the

・The guide 27 is removed so that the third inner core 113 is directly in contact with the stepped portion 26, and the inner peripheral surface of the straight 32 near the third communication port 24c is directed toward the third pipe 103 side to the inner diameter be a tapered surface that reduces the

・Instead of providing the first to third in-cores 111 to 113, the corresponding first straight portion 21 to third An inner tubular portion formed integrally with the straight portion 23 is provided, and the corresponding ends of the first to third pipes 101 to 103 are inserted into the outer peripheral surface of the inner tubular portion.

- The inner diameters of the first communication port 24a, the second communication port 24b, and the vertex portion 24d should be the same.

- As shown in Fig. 3 or 4, the guide 27 should be removed and the inner diameter of the third communication port 24c (straight 32) should be the same as the inner diameter of the third pipe 103 (the inner diameter of the third inner core 113). .

- As shown in FIG. 3, the straight 32 is connected at the branch portion 24 at a position closer to the second straight portion 22 than at an intermediate position of the corner 31 .

- As shown in FIG. 4, the straight 32 is connected at the branch portion 24 at a position closer to the first straight portion 21 than at an intermediate position of the corner 31 .

A technical idea that can be grasped from the above embodiment will be described.
(1) a joint body made of resin having a branch portion integrally formed with the first straight portion to the third straight portion so as to connect the first straight portion to the third straight portion; A first locking mechanism for retaining the first pipe connected to the straight portion, a second locking mechanism for retaining the second pipe connected to the second straight portion, and connected to the third straight portion. a third lock mechanism for preventing the third pipe from coming off, the branching portion having a corner connecting the first straight portion and the second straight portion arranged at right angles; and a corner branching from the corner. and a straight connected to the third straight portion, and at the corner, an inner peripheral surface of a first communication port with the first straight portion, and a connection between the first straight portion and the second straight portion The inner peripheral surface of the apex portion between and the inner peripheral surface of the second communication port with the second straight portion are each formed in a perfect circle shape, and at the corner, the inner peripheral surface of the first communication port and the A resin tee joint in which the inner peripheral surface of the vertex is smoothly connected, and the inner peripheral surface of the vertex and the inner peripheral surface of the second communication port are smoothly connected.

(2) The first pipe and the second pipe have the same inner diameter, the third pipe has a smaller inner diameter than the first pipe and the second pipe, and the inner diameter of the straight at the branch portion The resin cheese joint according to (1), which is larger than the inner diameter of the third pipe.

(3) The resin cheese joint according to (2), wherein a tapered surface is formed between the corner and the third pipe so that the inner diameter gradually decreases toward the third pipe.

DESCRIPTION OF SYMBOLS 1... Resin cheese joint, 11... Joint main body, 21... 1st straight part, 22... 2nd straight part, 23... 3rd straight part, 24... Branch part, 24a... 1st communication port, 24b... 2nd communication Mouth 24d Vertex 31 Corner 32 Straight 41 First locking mechanism 42 Second locking mechanism 43 Third locking mechanism 101 First pipe 102 Second pipe 103 Third pipe.

Claims (1)

A resin tee joint used for branching a pipe for water supply and hot water supply,
a joint body made of resin having a branch portion integrally formed with the first straight portion to the third straight portion so as to connect the first straight portion to the third straight portion to each other;
a first locking mechanism that prevents the first pipe connected to the first straight portion from coming off;
a second lock mechanism that prevents the second pipe connected to the second straight portion from coming off;
a third lock mechanism that prevents the third pipe connected to the third straight portion from coming off,
The branched portion has a corner connecting the first straight portion and the second straight portion arranged at right angles, and a straight branched from the corner and connected to the third straight portion ,
At the corner, the inner peripheral surface of the first communicating port with the first straight portion and the inner peripheral surface of the vertex portion between the first straight portion and the second straight portion are smoothly connected. and the inner peripheral surface of the vertex portion and the inner peripheral surface of the second communication port of the second straight portion are smoothly connected,
An acute-angled corner is formed inside the connecting portion between the corner and the straight,
The straight is a resin tee joint, wherein the axis of the straight is located closer to the first straight portion than the axis of the second straight portion.

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