JP7616550B2 - Elbow Pipe Fittings - Google Patents

Description

The present invention relates to an elbow pipe fitting.

Figure 5 shows an elbow pipe fitting 101 disclosed in Patent Document 1. The elbow pipe fitting 101 includes one fitting body 102 into which a plastic pipe 151 is inserted and connected, the other fitting body 102 into which a plastic pipe 151 of the same size as the plastic pipe 151 is inserted and connected, a retaining mechanism 103 consisting of a one-touch joint for holding the corresponding plastic pipe 151, which is constructed in each of the one fitting body 102 and the other fitting body 102, and a cap 104 for attaching the retaining mechanism 103 to the corresponding fitting body 102. The one fitting body 102 and the other fitting body 102 are arranged so that their axes L3 and L4 intersect at right angles.

Each joint body 102 is provided with a positioning surface 102a that determines the insertion position of the corresponding plastic pipe 151. When the intersection Q between the axis L3 of one joint body 102 and the axis L4 of the other joint body 102 is used as a reference, the positioning surface 102a of one joint body 102 and the positioning surface 102a of the other joint body 102 are set to have the same distances C3, C4 in the directions of the corresponding axes L3, L4. Therefore, the distance D3 from the intersection Q to the pipe insertion port 104a of the cap 104 corresponding to one joint body 102 is the same as the distance D4 from the intersection Q to the pipe insertion port 104a of the cap 104 corresponding to the other joint body 102.

JP 2019-011857 A

The object of the present invention is to provide a new elbow pipe fitting.

In order to achieve the above object, the elbow pipe fitting of the invention of claim 1 comprises one joint body into which a plastic pipe is inserted and connected, the other joint body into which a plastic pipe of the same size as the plastic pipe is inserted and connected, a slip-out prevention mechanism consisting of a one-touch joint for holding the corresponding plastic pipe, which is constructed on the one joint body and the other joint body, respectively, and a cap for attaching the slip-out prevention mechanism to the corresponding joint body, and the one joint body and the other joint body are arranged so that their axes intersect at right angles. Each joint body is provided with a positioning surface that determines the insertion position of the corresponding plastic pipe, and the flesh near the positioning surface of one joint body protrudes into the L-shaped flow path located at the boundary between the one joint body and the other joint body, and the flesh extends into the flow path up to the axis of the other joint body, and a notch is formed on the positioning surface of the other joint body on the opposite side to the part of the inner surface of the flow path that corresponds to the flesh, and the shape is such that it connects to the notch without a step in the flow path.

Longitudinal cross-sectional view of an elbow pipe fitting. FIG. 1 is a longitudinal cross-sectional view of a pipeline constructed using an elbow pipe fitting. FIG. 4 is a longitudinal sectional view of another example of an elbow pipe fitting. FIG. 11 is a longitudinal sectional view of another example of an elbow pipe fitting. FIG. 2 is a longitudinal sectional view of a conventional elbow pipe fitting. FIG. 1 is a longitudinal cross-sectional view of a pipeline constructed using a conventional elbow pipe joint.

Hereinafter, an embodiment of the present invention will be described in which the present invention is embodied in a pipeline for supplying cold water and hot water.
As shown in FIG. 1, the elbow pipe fitting 11 has two cylindrical fitting bodies 12 into which pipes 50 of the same size are inserted and connected. Each fitting body 12 is made of a synthetic resin such as polyphenylene sulfide resin. The pipe 50 is formed by inserting a cylindrical incore 52 into the end of a resin pipe 51. The resin pipe 51 is made of a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.). The incore 52 is prevented from sinking into the resin pipe 51 by a flange 52a formed at the end of the incore 52. The incore 52 is intended to maintain the roundness of the end of the resin pipe 51 at a high level.

In the elbow pipe fitting 11, one fitting body 12 and the other fitting body 12 are arranged so that their axes L1, L2 intersect at right angles. One fitting body 12 and the other fitting body 12 have the same structure except for some parts, and one fitting body 12 and the other fitting body 12 are constructed as one-touch fittings of the same structure. Therefore, unless necessary, only one fitting body 12 will be described for the identical parts, and the description of the other fitting body 12 will be omitted.

The fitting body 12 has an outer tube portion 15 protruding therefrom. An insertion space 13 is formed inside the outer tube portion 15 to allow the insertion of the piping 50. A step portion 15a is provided on the base end side of the inner circumferential surface of the outer tube portion 15. A locking step 15b is provided on the inner circumferential surface of the outer tube portion 15 on the tip side of the step portion 15a. A positioning surface 15c is provided on the base end of the inner circumferential surface of the outer tube portion 15, which abuts against the tip surface of the incore 52 to determine the insertion position of the piping 50. The positioning surface 15c exists on an imaginary plane perpendicular to the axes L1, L2 of the corresponding fitting body 12.

A seal ring retainer 16 made of polyacetal resin is retained on the retaining step 15b. A pair of seal rings 17 made of rubber such as ethylene-propylene-diene copolymer rubber are arranged at a distance between the seal ring retainer 16 and the step 15a. A spacer ring 18 is arranged between the pair of seal rings 17. When the piping 50 is inserted into the insertion space 13, the seal ring 17 is crushed between the outer circumferential surface of the resin pipe 51 and the inner circumferential surface of the outer tube 15, thereby ensuring watertightness between the two circumferential surfaces.

The elbow pipe fitting 11 includes a retaining mechanism 23 for holding the piping 50 to the fitting body 12, and a cap 20 for attaching the retaining mechanism 23 to the fitting body 12. The cap 20 is made of a synthetic resin such as polyphenylene sulfide resin. Two locking grooves 21 are formed on the inner peripheral surface of the cap 20. Two locking ridges 19 are formed on the outer peripheral surface of the outer tube portion 15. The cap 20 is fitted onto the outer tube portion 15, and is connected to the outer tube portion 15 by snap-engaging the locking grooves 21 with the locking ridges 19 of the outer tube portion 15. The cap 20 has an inclined surface 22 on the inner peripheral surface of the tip portion, the diameter of which decreases toward the tip side.

The lock ring 24 that constitutes the anti-slip mechanism 23 is made of a thin metal plate such as stainless steel and has a circular ring shape. On the inner periphery of the lock ring 24, multiple anti-slip pieces 24a are formed so as to protrude and incline toward the inner end. A split ring 26 that constitutes the anti-slip mechanism 23 is interposed between the lock ring 24 and the cap 20. The split ring 26 is made of a synthetic resin such as polyphenylene sulfide resin. The split ring 26 backs up and maintains the inclination angle of the anti-slip pieces 24a of the lock ring 24.

The lock ring retainer 25, which constitutes the anti-slip mechanism 23, is sandwiched between the seal ring retainer 16 and the cap 20. The lock ring 24 is sandwiched between the lock ring retainer 25 and the split ring 26. Assume that a pulling force is applied to the pipe 50 inserted into the insertion space 13 and with the split ring 26 and lock ring 24 inserted through it. In this case, the anti-slip piece 24a of the lock ring 24 bites into the outer circumferential surface of the plastic pipe 51, preventing the pipe 50 from slipping out of the elbow pipe fitting 11. In this case, the split ring 26 is guided by the inclined surface 22 of the cap 20 to reduce its diameter and tighten the outer circumferential surface of the plastic pipe 51, preventing the pipe 50 from slipping out of the elbow pipe fitting 11.

As described above, one joint body 12 and the other joint body 12 are constructed as one-touch joints of the same structure. Also, the same size pipe 50 is inserted and connected to one joint body 12 and the other joint body 12. Therefore, the distance C1 in the direction of axis L1 from the positioning surface 15c of one joint body 12 (hereinafter referred to as "joint body 12S") to the pipe insertion port 20a of the cap 20 corresponding to the joint body 12S is the same as the distance C2 in the direction of axis L2 from the positioning surface 15c of the other joint body 12 (hereinafter referred to as "joint body 12L") to the pipe insertion port 20a of the cap 20 corresponding to the joint body 12L.

However, when the intersection P between the axis L1 of the fitting body 12S and the axis L2 of the fitting body 12L is taken as the reference point, the positioning surface 15c of the fitting body 12S is located closer to the intersection P in the direction of the corresponding axis L1, L2 than the positioning surface 15c of the fitting body 12L. Therefore, the distance D1 from the intersection P to the pipe insertion port 20a corresponding to the fitting body 12S in the direction of the axis L1 is shorter than the distance D2 from the intersection P to the pipe insertion port 20a corresponding to the fitting body 12L in the direction of the axis L2.

As a result, the fleshy portion 15d near the positioning surface 15c of the fitting body 12S protrudes into the L-shaped flow passage 31 located at the boundary between the fitting body 12S and the fitting body 12L, and even penetrates into the flow passage 31 near the axis L2 of the fitting body 12L. Therefore, due to the protrusion of the fleshy portion 15d, the flow passage 31 has a reduced cross-sectional area for hot and cold water passing from the fitting body 12L side to the fitting body 12S side. In order to make the reduction in the cross-sectional area more gradual, the portion 31a on the inner surface of the flow passage 31 that corresponds to the fleshy portion 15d is formed in a tapered shape.

By forming the portion 31a of the flow path 31 in a tapered shape, part of the flow of hot water leaving the joint body 12L and heading toward the joint body 12S is bent in the opposite direction to portion 31a. Therefore, a notch 15c-1 is formed on the positioning surface 15c of the joint body 12L on the side opposite portion 31a, and the flow path 31 is also shaped to connect to the notch 15c-1 without any steps, so the bending of the flow of hot water described above is performed smoothly. In addition, a notch 15c-2 is formed on the positioning surface 15c of the joint body 12S in a portion corresponding to the inside of the L-shape of the flow path 31, so that the flow of hot water between the joint body 12L and the joint body 12S is smoothly bent in the flow path 31.

The above embodiment can provide the following advantageous effects.
(1) As shown in FIG. 2, when constructing a pipeline using two elbow pipe fittings 11 to overcome a small step (inlet/outlet bump) K, by arranging fitting bodies 12S with a short distance D1 (see FIG. 1) between the outlet and outlet bumps, the elbow pipe fitting 11 corresponding to the outlet bump can be well positioned along the outlet bump.

(2) Because the anti-slip mechanism 23 of the elbow pipe fitting 11 is a one-touch fitting, it is possible to perform construction (connection) with the distance between the pipe insertion openings 20a on the opposing fitting bodies 12S sides of the two elbow pipe fittings 11 being nearly zero, which is particularly suitable for small inlet/outlet holes K.

(Another example)
The above embodiment can be modified, for example, as follows.
As shown in FIG. 3, a portion 31a of the inner surface of the flow passage 31 corresponding to the thick portion 15d may be formed in a stepped shape.

As shown in FIG. 4, the fleshy portion 15d near the positioning surface 15c of the joint body 12S is not allowed to protrude into the L-shaped flow passage 31 located at the boundary between the joint body 12S and the joint body 12L. In this way, the flow resistance of hot and cold water in the flow passage 31 can be reduced.

○ Eliminate the incore 52 from the pipe 50. In this case, provide an inner tube portion having the same function as the incore 52 in the fitting body 12.

Next, the technical concept that can be understood from the above embodiment will be described.
(A) An elbow pipe fitting comprising: one joint body into which a plastic pipe is inserted and connected; another joint body into which a plastic pipe of the same size as the plastic pipe is inserted and connected; a slip-out prevention mechanism constructed on each of the one joint body and the other joint body and consisting of a one-touch joint for holding the corresponding plastic pipe; and a cap for attaching the slip-out prevention mechanism to the corresponding joint body, wherein the one joint body and the other joint body are arranged so that their axes intersect at right angles;
Each of the joint bodies is provided with a positioning surface that defines an insertion position of the corresponding resin pipe,
a portion of the first joint body adjacent to the positioning surface protrudes into an L-shaped flow passage located at a boundary between the first joint body and the second joint body, and the portion of the first joint body extends into the flow passage up to an axis of the second joint body;
An elbow pipe fitting in which, taking the intersection between the axis of one fitting body and the axis of the other fitting body as a reference, the positioning surface of the one fitting body is located at a position closer to the intersection in the axial direction than the positioning surface of the other fitting body and closer to the intersection in the axial direction than a distance of half the inner diameter of the pipe insertion port of the cap, thereby making the distance from the intersection to the pipe insertion port of the cap attached to the one fitting body shorter than the distance from the intersection to the pipe insertion port of the cap attached to the other fitting body.

(b) A method for constructing a pipeline that goes over an inlet and outlet, using two elbow pipe fittings according to the technical idea (a) and positioning one of the fitting bodies of each of the two elbow pipe fittings between the outlet and inlet.

11... elbow pipe fitting, 12... fitting body, 12S... one fitting body, 12L... other fitting body, 15c... positioning surface, 20... cap, 20a... pipe insertion port, 23... anti-slip mechanism, 51... plastic pipe, K... inlet/outlet.

Claims (1)

An elbow pipe fitting comprising: one joint body into which a plastic pipe is inserted and connected; another joint body into which a plastic pipe of the same size as the plastic pipe is inserted and connected; a slip-out prevention mechanism constructed on each of the one joint body and the other joint body and consisting of a one-touch joint for holding the corresponding plastic pipe; and a cap for attaching the slip-out prevention mechanism to the corresponding joint body, wherein the one joint body and the other joint body are arranged so that their axes intersect at a right angle,
Each of the joint bodies is provided with a positioning surface that defines an insertion position of the corresponding resin pipe,
a portion of the first joint body adjacent to the positioning surface protrudes into an L-shaped flow passage located at a boundary between the first joint body and the second joint body, and the portion of the first joint body extends into the flow passage up to an axis of the second joint body;
A notch is formed on the inner surface side of the flow path in the positioning surface of the other joint body on the opposite side to the portion corresponding to the meat portion (i.e., on the opposite side 180° from the axis of the other joint body),
An elbow joint in which the inner surface of the flow path and the notch are connected to each other without any step only on the inner surface side of the flow path with respect to the boundary between the inner surface of the flow path and the positioning surface .

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