Elbow Pipe Fittings

Abstract

To provide a new elbow pipe joint.SOLUTION: An elbow pipe joint 11 includes: joint bodies 12S and 12L; a slipping-off prevention mechanism 23 constructed in each of the joint bodies 12S and 12L for holding a resin pipe 51; and a cap 20 for attaching the slipping-off prevention mechanism 23 to the joint bodies 12S and 12L. Each of the joint bodies 12S and 12L is provided with a positioning surface 15c for stipulating an insertion position of the resin pipe 51. A thick part 15d in the vicinity of the positioning surface 15c in the joint body 12S reaches the vicinity of an axis line L2 of the joint body 12L with respect to a flow channel 31. A cutout 15-1 is formed on a side opposite to a part 31a corresponding to the thick part 15d on an inner surface of the flow channel 31 on the positioning surface 15c of the joint body 12L. In the flow channel 31, connection is made to the cutout 15-1 without a step.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an elbow pipe fitting. [Background technology]

[0002] 5 shows an elbow pipe joint 101 disclosed in Patent Document 1. The elbow pipe joint 101 includes one joint body 102 into which a plastic pipe 151 is inserted and connected, the other joint 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 constructed in each of the one joint body 102 and the other joint body 102 for holding the corresponding plastic pipe 151, and a cap 104 for attaching the retaining mechanism 103 to the corresponding joint body 102. The one joint body 102 and the other joint body 102 are arranged such that their axes L3, L4 intersect at a right angle.

[0003] Each joint body 102 is provided with a positioning surface 102a that determines the insertion position of the corresponding plastic pipe 151. When an intersection Q between an axis L3 of one joint body 102 and an 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, a 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 a distance D4 from the intersection Q to the pipe insertion port 104a of the cap 104 corresponding to the other joint body 102. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-011857 ​​A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a novel elbow pipe joint. [Means for solving the problem]

[0006] In order to achieve the above object, an elbow pipe fitting according to the invention of claim 1 comprises 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 which determines the insertion position of the corresponding plastic pipe, and a flesh portion near the positioning surface of one of the joint bodies protrudes into an L-shaped flow path located at the boundary between the one joint body and the other joint body, and the flesh portion extends into the flow path up to near the axis of the other joint body. A notch is formed on the positioning surface of the other joint body on the opposite side to the part corresponding to the flesh portion on the inner surface of the flow path, and the positioning surface of the other joint body is shaped to connect without a step to the notch in the flow path. [Brief description of the drawings]

[0007] [Figure 1] Longitudinal cross-sectional view of an elbow pipe fitting. [Diagram 2] FIG. 4 is a longitudinal cross-sectional view of a pipeline constructed using an elbow pipe fitting. [Diagram 3] FIG. 4 is a longitudinal sectional view of another example of an elbow pipe fitting. [Figure 4] FIG. 11 is a longitudinal sectional view of another example of an elbow pipe fitting. [Diagram 5] FIG. 2 is a longitudinal sectional view of a conventional elbow pipe fitting. [Figure 6] FIG. 1 is a longitudinal cross-sectional view of a pipeline constructed using a conventional elbow pipe joint. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] 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, an 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.

[0009] In the elbow pipe joint 11, one joint body 12 and the other joint body 12 are arranged so that their axes L1, L2 intersect at a right angle. One joint body 12 and the other joint body 12 have the same structure except for some parts, and one joint body 12 and the other joint body 12 form a one-touch joint of the same structure. Therefore, unless necessary, only one joint body 12 will be described for the same parts, and a description of the other joint body 12 will be omitted.

[0010] An outer tubular portion 15 is formed to protrude from the joint body 12. An insertion space 13 that allows the insertion of the piping 50 is formed inside the outer tubular portion 15. A step 15a is provided on the base end side of the inner circumferential surface of the outer tubular portion 15. A locking step 15b is provided on the tip side of the step 15a on the inner circumferential surface of the outer tubular portion 15. A positioning surface 15c is provided on the base end of the inner circumferential surface of the outer tubular 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 that is perpendicular to the axes L1, L2 of the corresponding joint body 12.

[0011] A seal ring holder 16 made of polyacetal resin is engaged with the engagement 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 holder 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 cylinder 15, thereby ensuring watertightness between the two circumferential surfaces.

[0012] 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 tubular portion 15. The cap 20 is fitted onto the outer tubular portion 15, and is connected to the outer tubular portion 15 by snap-engaging the locking grooves 21 with the locking ridges 19 of the outer tubular 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.

[0013] The lock ring 24 constituting the retaining mechanism 23 is made of a thin metal plate such as stainless steel and has an annular shape. A plurality of retaining pieces 24a are formed on the inner periphery of the lock ring 24 so as to protrude and incline toward the inner end. A split ring 26 constituting the retaining 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 retaining pieces 24a of the lock ring 24.

[0014] A lock ring holder 25 constituting the retaining mechanism 23 is sandwiched between the seal ring holder 16 and the cap 20. A lock ring 24 is sandwiched between the lock ring holder 25 and the split ring 26. Assume that a pulling force acts on the pipe 50 inserted into the insertion space 13 and through which the split ring 26 and the lock ring 24 are inserted. In this case, the retaining piece 24a of the lock ring 24 bites into the outer circumferential surface of the plastic pipe 51, thereby preventing the pipe 50 from coming off from the elbow pipe fitting 11. Also, 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, thereby preventing the pipe 50 from coming off from the elbow pipe fitting 11.

[0015] As described above, one joint body 12 and the other joint body 12 are constructed as one-touch joints of the same structure. In addition, the pipe 50 of the same size is inserted and connected to one joint body 12 and the other joint body 12. Therefore, the distance C1 in the direction of the axis L1 from the positioning surface 15c of one joint body 12 (hereinafter referred to as the "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 the axis L2 from the positioning surface 15c of the other joint body 12 (hereinafter referred to as the "joint body 12L") to the pipe insertion port 20a of the cap 20 corresponding to the joint body 12L.

[0016] However, when the intersection P of the axis L1 of the joint body 12S and the axis L2 of the joint body 12L is taken as a reference, the positioning surface 15c of the joint body 12S is provided at a position closer to the intersection P in the direction of the corresponding axes L1, L2 than the positioning surface 15c of the joint body 12L. Therefore, the distance D1 from the intersection P to the pipe insertion port 20a corresponding to the joint 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 joint body 12L in the direction of the axis L2.

[0017] Accordingly, the fleshy portion 15d near the positioning surface 15c of the joint body 12S protrudes into the L-shaped flow passage 31 located at the boundary between the joint body 12S and the joint body 12L, and further penetrates into the vicinity of the axis L2 of the joint body 12L with respect to the flow passage 31. Therefore, the protrusion of the fleshy portion 15d reduces the cross-sectional area of ​​the flow passage 31 through which hot and cold water passes from the joint body 12L side to the joint 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.

[0018] By forming the portion 31a of the flow passage 31 in a tapered shape, a part of the flow of hot and cold water leaving the joint body 12L and heading toward the joint body 12S is bent in the opposite direction to the portion 31a. Therefore, a notch 15c-1 is formed on the positioning surface 15c of the joint body 12L on the opposite side to the portion 31a, and the flow passage 31 is also shaped to connect to the notch 15c-1 without any steps, so that the bending of the flow of hot and cold water described above is performed smoothly. Note that a notch 15c-2 is also 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 passage 31, and the flow of hot and cold water between the joint body 12L and the joint body 12S is bent smoothly in the flow passage 31.

[0019] The above embodiment can provide the following advantageous effects. (1) As shown in Figure 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 Figure 1) between the outlet and inlet bumps, the elbow pipe fitting 11 corresponding to the outlet bump can be well positioned along the outlet bump.

[0020] (2) Since the anti-slip mechanism 23 of the elbow pipe fitting 11 is a one-touch fitting, construction (connection) is possible with the distance between the pipe insertion ports 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 gaps K.

[0021] (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 that corresponds to the flesh portion 15d may be formed in a stepped shape.

[0022] As shown in Figure 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.

[0023] The incore 52 may be removed from the pipe 50. In this case, an inner cylindrical portion having the same function as the incore 52 may be provided in the joint body 12.

[0024] 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 retaining 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 retaining 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.

[0025] (b) A method for constructing a pipeline that overcomes an inlet and outlet, comprising using two elbow pipe fittings according to technical idea (a) and positioning one of the fitting bodies of each of the two elbow pipe fittings between the outlet and inlet. [Explanation of symbols]

[0026] 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 pipe.

Claims

[Claim 1] An elbow pipe joint 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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