WO2020149168A1

WO2020149168A1 - Pipe joint structure

Info

Publication number: WO2020149168A1
Application number: PCT/JP2020/000125
Authority: WO
Inventors: 健人前川; 涼志中山
Original assignee: 株式会社ブリヂストン
Priority date: 2019-01-18
Filing date: 2020-01-07
Publication date: 2020-07-23
Also published as: JP7187106B2; JP2020117863A; TW202035832A

Abstract

The pipe joint structure includes a pipe joint connecting a water pipe and a faucet, a faucet box in which the pipe joint is stored, a flat plate that is provided on the faucet side of the faucet box and has a first opening capable of connecting the faucet to the pipe joint, and a decorative plate that covers the flat plate from the faucet side, has a second opening capable of connecting the faucet to the pipe joint, and has a third opening positioned so as not to overlap with the pipe joint in a front view, wherein a heater guide pipe can be inserted into the third opening, and the flat plate has a guide that directs an end portion of the heater guide pipe at the pipe joint side toward the third opening.

Description

Pipe joint structure

The present disclosure relates to a pipe joint structure.

Japanese Unexamined Patent Application Publication No. 2004-250861 discloses a structure in which a header box is attached to a boiler, an air pipe is connected to an air header in the header box, and the air pipe is covered with a water pipe and a sheath pipe. ing. In this structure, air inside and outside the building is taken in by a blower, passed through an air header inside the header box, and air or warm air is sent to a pipe through which air flows, thereby preventing freezing of the water supply pipe.

However, using air or warm air to prevent freezing is considered unfavorable in terms of thermal efficiency and cost.

The present disclosure, in a structure in which a pipe joint connecting a faucet and a water supply pipe is housed in a faucet box, a heater wire from a faucet side to a heater guide pipe along a water supply pipe without enlarging the faucet box. The purpose is to make it easier to insert.

The pipe joint structure according to the present disclosure includes a pipe joint that connects a water supply pipe through which a liquid flows, a faucet attached in a direction intersecting the axial direction of the water supply pipe, and a faucet box in which the pipe joint is housed. A flat plate provided on the faucet side of the faucet box and having a first opening for connecting the faucet to the pipe joint, and the flat plate covering the flat plate from the faucet side, A decorative plate having a second opening for connecting the plug to the pipe joint and a third opening formed at a position not overlapping the pipe joint when viewed from the front, the third opening A heater guide tube, which is provided along the water supply tube and allows a heater wire to pass therethrough, can be inserted into the portion, and the flat plate is positioned so as to overlap with the third opening of the decorative plate in a front view. It has a notch, and has a guide that extends obliquely toward the inside of the faucet box with respect to the flat plate, and that directs the end of the heater guide tube on the pipe joint side toward the third opening side.

According to the pipe joint structure according to the present disclosure, in a structure in which the pipe joint connecting the water faucet and the water supply pipe is housed in the water faucet box, the water faucet side is connected to the water supply pipe without enlarging the water faucet box. It is possible to easily insert the heater wire into the heater guide tube along the heater guide tube.

In the pipe joint structure according to the present embodiment, it is a perspective view showing a state in which the heater guide pipe is exposed at the third opening. It is a perspective view showing the state where the 3rd opening was closed by the lid member in the pipe joint structure concerning this embodiment. It is an exploded perspective view showing a pipe joint structure concerning this embodiment. It is a front view which shows the state which removed the decorative plate in the pipe joint structure which concerns on this embodiment. It is a front view which shows the state which removed the decorative board fixed frame in FIG. FIG. 6 is an enlarged cross-sectional view (a faucet is omitted) taken along line 6-6 in FIG. 1, showing the pipe joint structure according to the present embodiment. FIG. 6 is an enlarged cross-sectional view showing a state in which an end portion of the heater guide pipe on the pipe joint side is pushed to a position of a guide and a third opening is closed by a lid member. It is a partial fracture enlarged front view showing the state where the 3rd opening is closed by the lid member and the end by the side of the pipe joint of a heater guide pipe is located in the back of the 3rd opening. FIG. 6 is a partially enlarged front view showing a state in which a retaining member is attached to an end portion of the heater guide tube on the pipe joint side, and the end portion is locked to the guide by the retaining member. FIG. 6 is a partially enlarged front view showing a state where an end portion of the heater guide pipe on the pipe joint side is hooked on a hooking portion of a flat plate.

Hereinafter, a mode for carrying out the present invention will be described with reference to the drawings. 1 and 2, the pipe joint structure 10 according to the present embodiment is used for connecting a faucet 14 to, for example, an indoor side of a wall 12 of a building. In FIG. 3, the pipe joint structure 10 includes a pipe joint 16, a faucet box 18, a flat plate 20, and a decorative plate 22. A substantially rectangular penetrating portion 12A is formed on the wall 12. The vertical and horizontal dimensions of the penetration portion 12A are set to be slightly smaller than the vertical and horizontal dimensions of the flat plate 20, for example. The wall 12 is not shown in FIGS. 4, 5, 9, and 10.

In FIG. 6, the pipe joint 16 is a pipe member that connects the water supply pipe 24 through which the liquid flows and the water faucet 14 (FIG. 1) attached in a direction intersecting the axial direction of the water supply pipe 24. The pipe joint 16 is a so-called elbow formed in an L shape, but may have various other shapes.

The water supply pipe 24 is, for example, a resin pipe that extends in a substantially vertical direction along the wall 12 and has an upper end connected to one end 16A of the pipe joint 16. Examples of the resin material of the water supply pipe 24 include polyolefins such as polybutene, polyethylene, cross-linked polyethylene, and polypropylene, and vinyl chloride. The resin may be used alone or in combination of two or more kinds. Among the resins, polybutene is preferably used, and polybutene is preferably contained as the main component. For example, it is more preferable that the resin material forming the water supply pipe 24 contains polybutene in an amount of 85% by mass or more. In addition, the resin material forming the water supply pipe 24 may contain other additives.

The outer diameter of the water supply pipe 24 is not particularly limited, but is set in the range of 10 mm to 100 mm, for example. The most preferable outer diameter of the water pipe 24 is in the range of 12 mm to 35 mm.

The thickness of the water supply pipe 24 is not particularly limited, but is set to, for example, 1.0 mm to 5.0 mm. The most preferable thickness of the water pipe 24 is in the range of 1.4 mm to 3.2 mm.

The other end 16B of the pipe joint 16 is oriented in a direction orthogonal to the wall 12 and is open to the room side through the wall 12, the flat plate 20 and the decorative plate 22. The end face of the other end 16B of the pipe joint 16 is arranged so as to be substantially flush with the surface of the decorative plate 22, for example. In FIG. 1, the water faucet 14 is directly connected to the pipe joint 16, but the present invention is not limited to this, and another pipe may be connected between the water faucet 14 and the pipe joint 16. Further, the configuration of the faucet 14 is not limited to that shown in the figure.

The faucet box 18 is a member that houses the pipe joint 16. As shown in FIG. 3, the faucet box 18 has, for example, an upper wall 18A, a pair of side walls 18B, and a rear wall 18C. A plurality of female screws 18D are formed on the inner wall 18C. The pipe joint 16 is provided with a mounting seat 16C having a through hole 16D. The mounting seat 16C is a portion that faces the back wall 18C when the pipe joint 16 is mounted on the faucet box 18. The mounting seat 16C is fixed to the inner wall 18C by inserting the screw 26 into the through hole 16D and screwing the screw 26 into the female screw 18D of the inner wall 18C. In this way, the pipe joint 16 is fastened to the faucet box 18.

The pipe joint 16 is provided with not only a mounting seat 16C facing the back wall 18C but also a mounting seat 16E facing the upper wall 18A. Although illustration is omitted, it is possible to provide a female screw on the upper wall 18A and fix the mounting seat 16E to the upper wall 18A when the pipe joint 16 is fastened to the faucet box 18.

A mounting seat 18F having a female screw 18E is provided at the end of the side wall 18B on the wall 12 side. As shown in FIG. 6, the mounting seat 18F is formed by bending the edges of the side walls 18B on both sides. The female screw 18E is provided at each of the upper end portion and the lower end portion of the mounting seat 18F. At least a part of the mounting seat 18F contacts the outdoor side of the wall 12 when the faucet box 18 is mounted on the wall 12.

As shown in FIGS. 2 and 5, the flat plate 20 is provided on the faucet 14 (FIG. 1) side of the faucet box 18. Specifically, the water faucet box 18 is provided on the outside of the wall 12, whereas the flat plate 20 is provided on the side where the faucet 14 (FIG. 1) is provided, that is, on the indoor side of the wall 12. In other words, the wall 12 is sandwiched between the flat plate 20 and the faucet box 18.

Through holes 20A through which screws 28 are inserted are formed at the four corners of the flat plate 20. The screw 28 is inserted into the through hole 20A from the indoor side, reaches the outdoor side through the through portion 12A of the wall 12, and is screwed into the female screw 18E of the faucet box 18. Thereby, the flat plate 20 and the faucet box 18 are fastened.

3 to 6, the flat plate 20 is formed with a first opening 31 that allows the faucet 14 (FIG. 1) to be connected to the pipe joint 16. The first opening 31 is, for example, a notch, and is formed to be slightly larger than the outer diameter of the other end 16B so that the other end 16B of the pipe joint 16 can be inserted therethrough. A cutout 20B for passing a heater guide tube 30 described later is formed at a position of the flat plate 20 that overlaps with a third opening 33 (described later) of the decorative plate 22 in a front view. The notch 20B is formed in a substantially rectangular shape that is long in the vertical direction. The notch 20B is continuous with the first opening 31, and the first opening 31 and the notch 20B can be formed at once by punching, for example.

As shown in FIG. 6, a guide 34 is integrally provided at the lower end of the notch 20B in the flat plate 20, for example. The guide 34 extends, for example, obliquely upward toward the inside of the faucet box 18 with respect to the flat plate 20, and the end portion 30A of the heater guide pipe 30 on the pipe joint 16 side (hereinafter, simply “end of the heater guide pipe 30”). Portion 30A") is directed to the third opening 33 (described later) side of the decorative plate 22. The guide 34 is integrally formed with the flat plate 20 by, for example, press molding, and is provided at an angle of, for example, 35 to 45° with respect to the flat plate 20. In other words, the angle θ formed by the guide 34 and the flat plate 20 is 35 to 45°.

As shown in FIGS. 3 and 5, the guide 34 is formed with, for example, a through hole 34A through which the heater guide tube 30 can be inserted. In FIG. 3, the through hole 34A is provided inside the flat plate 20 in the width direction of the through hole 20A and outside the female screw 20C in the width direction of the flat plate 20. The guide 34 guides the end portion 30A of the heater guide tube 30 to the third opening 33 of the decorative plate 22 without interfering with the lower screw 28 (FIG. 4). A cutout (not shown) may be formed in the guide 34 instead of the through hole 34A.

As shown in FIGS. 5 and 10, a hook portion 36 is provided at a position different from the guide 34 on the flat plate 20. The hook portion 36 can hook the end portion 30A of the heater guide tube 30. The hooking portion 36 is normally covered with the decorative plate 22. The hooking portion 36 is, for example, a rectangular projecting portion formed in the upper left corner of the cutout 20B in the front view of the flat plate 20. A through hole 20A (FIG. 3) through which the upper screw 28 is inserted is formed in the hook portion 36, but the hook portion 36 projects downward from the screw 28. Therefore, even if the screw 28 is present, the end portion 30A of the heater guide tube 30 can be hooked on the hook portion 36. The position of the hook portion 36 is not limited to this, and the hook portion 36 may be provided at another position such as the central portion in the vertical direction of the notch 20B.

Instead of providing the hooking portion 36, as shown in FIG. 9, a retaining member 46 may be attached above the guide 34 in the heater guide tube 30. The retaining member 46 is, for example, a ring fitted in the heater guide tube 30. The inner diameter of the retaining member 46 is slightly smaller than the outer diameter of the heater guide tube 30. This prevents the retaining member 46 from being easily separated from the heater guide tube 30. The outer diameter of the retaining member 46 is larger than the diameter of the through hole 34A of the guide 34. This prevents the retaining member 46 from passing through the through hole 34A.

As shown in FIG. 3, female screws 20C are provided at, for example, two horizontal center parts in the upper and lower portions of the flat plate 20. The female screw 20C is a screw portion for fastening the decorative plate fixing frame 38 to the flat plate 20. A through hole 38</b>A into which a screw 41 is inserted is formed in the center of the decorative plate fixing frame 38 at two upper and lower positions in the horizontal direction. The screw 41 is inserted into the through hole 38A from the indoor side and is screwed into the female screw 20C of the flat plate 20. Thereby, the decorative plate fixing frame 38 and the flat plate 20 are fastened. As shown in FIG. 6, the decorative plate fixing frame 38 is in contact with or close to the wall 12 so as to surround the flat plate 20.

As shown in FIG. 4, a rectangular protruding portion 38B is provided on the left side of the decorative plate fixing frame 38. For example, an elliptical hole 38C is formed in the overhanging portion 38B. The heater guide tube 30 is adapted to be inserted into the elliptical hole 38C.

1 to 3, 6, and 7, the decorative plate 22 is a member that covers the flat plate 20 from the faucet 14 (FIG. 1) side. Specifically, the decorative plate 22 is detachably fitted into the decorative plate fixing frame 38 by, for example, claw fitting. The decorative plate 22 is formed with a second opening 32 that allows the faucet 14 to be connected to the pipe joint 16, and a third opening 33 is formed at a position not overlapping the pipe joint 16 in a front view. ..

The second opening 32 is, for example, a circular hole, and is formed slightly larger than the outer diameter of the other end 16B so that the other end 16B of the pipe joint 16 can be inserted (FIG. 6). When the other end 16B is deeper on the faucet box 18 side than the decorative plate 22, it is sufficient that the faucet 14 can be connected to the other end 16B through the second opening 32. In this case, the second opening 32 may be smaller than the outer diameter of the other end 16B.

The heater guide tube 30 can be inserted into the third opening 33. The heater guide pipe 30 is a flexible resin pipe that is provided along the water supply pipe 24 and allows the heater wire 40 (FIG. 1) to pass inside. As shown in FIGS. 4 and 5, the water supply pipe 24 and the heater guide pipe 30 are covered with a resin coating layer 44 and are bundled in a state of being in close contact with each other. This constitutes the composite pipe 50.

Examples of the resin as the coating layer 44 include polyurethane, polystyrene, polyethylene, polypropylene, ethylene propylene diene rubber, and a mixture of these resins. Among the resins, polyurethane is preferable. The coating layer 44 is preferably a layer containing polyurethane as a main component (that is, a porous urethane layer). For example, in the constituent components of the coating layer 44, polyurethane is preferably contained in an amount of 80% by mass or more, and more preferably 90% by mass or more. The porous resin layer as the coating layer 44 may contain other additives.

The presence ratio of pores in the coating layer 44 (for example, the foaming rate in the case of a foam) can be measured using the method described in Annex 1 of JIS-K6400-1 (2012). Here, the existence ratio of 25/25 mm or more is preferable, and the existence ratio of 45/25 mm or less is more preferable. The coating layer 44 is preferably a foam.

The density of the porous resin layer as the coating layer 44 is set in the range of 12 kg/m ³ to 22 kg/m ³ .

When the end portion of the water supply pipe 24 is connected to the one end 16A of the pipe joint 16, if the end portion of the coating layer 44 is shortened and deformed along the axial direction of the water supply pipe 24 and displaced, the end portion of the water supply pipe 24 is exposed. To do. By setting the density of the porous resin layer to 22 kg/m ³ or less, the coating layer 44 has appropriate flexibility. Therefore, the end of the coating layer 44 in the composite pipe 50 can be easily shortened and deformed to expose the end of the water supply pipe 24.

On the other hand, since the density of the porous resin layer is set to 12 kg/m ³ or more, the coating layer 44 has an appropriate strength, and processing such as manufacturing the composite pipe 50 including the water supply pipe 24 and the heater guide pipe 30 is performed. Occurrence of breakage or breakage of the coating layer 44 at this time can be effectively suppressed.

Here, the density of the porous resin layer can be measured by the method specified in JIS-K7222 (2005). The measurement environment is a temperature of 23° C. and a relative humidity of 45%.

The method for controlling the density of the porous resin layer in the above range is not particularly limited, but for example, a method of adjusting the abundance ratio of pores (for example, a foaming rate in the case of a foam), a resin And a method for adjusting the molecular structure of As a method of adjusting the molecular structure of the resin, a method of adjusting the molecular structure of the monomer that is the raw material of the resin and the method of adjusting the cross-linked structure thereof can be practically used.

The heater guide tube 30 is a tube formed of a synthetic resin material whose main material is polyethylene, polypropylene or aliphatic polyamide, and has flexibility. The heater guide tube 30 is, for example, a circular tube having a diameter smaller than that of the water supply tube 24 and having no uneven surface. The heater guide tube 30 is generally a member that has an outer diameter of 5 mm to 20 mm, has the heater wire 40 inserted therein, and can sufficiently transmit the generated heat to the outside. The heater guide tube 30 may be a so-called corrugated tube having a bellows shape having ridges and valleys. Since the heater guide pipe 30 has a smaller diameter than the water supply pipe 24, as shown in FIG. 3, the other end 16B of the pipe joint 16 is inserted into the third opening 33 into which the heater guide pipe 30 is inserted. It is smaller than the second opening 32.

As the heater wire 40, either a heater wire with a thermostat or a self-controlled heater may be used, but a self-controlled heater is preferable. By using the self-controlling heater, it is possible to efficiently heat the water supply pipe 24 by, for example, connecting the heater guide pipe 30 only to a portion where freezing is expected.

The third opening 33 is closer to the water pipe 24 than the second opening 32. Specifically, when viewed from the front of the decorative plate 22, the third opening 33 is located at a position where it does not interfere with the flange 14A of the faucet 14, for example, at the lower left of the second opening 32. Depending on the type of the faucet 14, a bowl seat (not shown) may be used instead of the flange 14A, but the third opening 33 is arranged so as not to interfere with this bowl seat.

At least a part of the third opening 33 has an elliptical shape that is long in the direction in which the heater guide tube 30 extends. As shown in FIG. 1, FIG. 3, and FIG. 8, a guide portion 22A having a U-shaped cross section is projected to the inside of the third opening 33. As shown in FIG. 6, the guide portion 22A extends obliquely upward toward the indoor side.

On the other hand, on the back side of the third opening 33, a guide portion 22B that extends obliquely downward toward the outdoor side is projected. The guide portion 22B is located on the opposite side of the guide portion 22A in the third opening 33. The

guide portions

22A and 22B are formed in a tubular shape.

The above-mentioned

guide portions

22A and 22B are integrally formed with the decorative plate 22. The end portion 30A of the heater guide tube 30 is guided by the

guide portions

22A and 22B, so that the end portion 30A is opened obliquely upward on the indoor side.

As shown in FIGS. 2 and 8, in the present embodiment, when the heater guide tube 30 is not used, the lid member 42 can be attached to the third opening 33 of the decorative plate 22 to close it. The lid member 42 has a lid body 42A and a fitting portion 42B. The lid main body 42A is a portion exposed to the indoor side when the lid member 42 is attached. The fitting portion 42B is a portion fitted into the

tubular guide portions

22A and 22B.

(Action)
The present embodiment is configured as described above, and its operation will be described below. 1 and 6, in the pipe joint structure 10 according to the present embodiment, the heater guide pipe 30 can be inserted into the third opening 33 of the decorative plate 22 provided in the faucet box 18. As shown in FIGS. 4 and 5, the heater guide pipe 30 is provided along the water supply pipe 24, and the heater wire 40 can be inserted therein. The end 30A of the heater guide tube 30 can be easily pulled out in front of the decorative plate 22 through the first opening 31 of the flat plate 20 and the third opening 33 of the decorative plate 22. Since the third opening 33 is formed at a position where it does not overlap with the pipe joint 16 when viewed from the front, the faucet 14 connected to the pipe joint 16 and the heater guide pipe 30 are unlikely to interfere with each other. Therefore, even if the size of the faucet box 18 is not increased, it is easy to pass the heater wire 40 inside the heater guide tube 30.

If the third opening 33 is on the side farther from the water supply pipe 24 than the second opening 32, the heater guide pipe 30 is passed through while avoiding the pipe joint 16, so it is difficult to pass the heater wire 40 through that portion. Become. In the present embodiment, since the third opening 33 is located closer to the water supply pipe 24 than the second opening 32, the heater guide pipe 30 is soaked with water so that the heater wire 40 can be easily passed through the heater guide pipe 30. It can be attached to the stopper box 18.

Further, as shown in FIG. 6, in the present embodiment, the guide 34 is provided at an angle θ of 35 to 45° with respect to the flat plate 20. Therefore, when the end portion 30A of the heater guide tube 30 is pulled out to the front side of the decorative plate 22 through the third opening 33 of the decorative plate 22, the heater guide tube 30 can be curved with a large radius of curvature R. The radius of curvature R is desirably, for example, 130 mm or more. Therefore, it becomes easier to pass the heater wire 40 through the heater guide tube 30. By supplying electric power to the heater wire 40 passing through the heater guide pipe 30, it is possible to prevent the liquid in the water supply pipe 24 from freezing.

When the heater wire 40 is not passed through the heater guide tube 30, that is, when the heater guide tube 30 is not used, it does not look good if the heater guide tube 30 is visible from the third opening 33 of the decorative plate 22. In the present embodiment, as shown in FIG. 10, the end portion 30A of the heater guide tube 30 can be hooked on the hook portion 36 provided on the flat plate 20. Therefore, when the heater guide tube 30 is not used, the end portion 30A of the heater guide tube 30 can be easily accommodated in the faucet box 18. As shown in FIG. 9, instead of the hook portion 36, a retaining member 46 may be used to store the end portion 30A of the heater guide tube 30 in the faucet box 18.

When the heater guide tube 30 is used again, the decorative plate 22 is removed from the faucet box 18, the end portion 30A of the heater guide tube 30 is removed from the hook portion 36, and the decorative plate 22 is passed through the third opening 33 of the decorative plate 22, The decorative plate 22 is attached to the faucet box 18. As a result, the end portion 30A of the heater guide tube 30 can be easily pulled out to the indoor side.

In the present embodiment, at least a part of the third opening 33 of the decorative plate 22 has an elliptical shape that is long in the direction in which the heater guide tube 30 extends, so that the end portion 30A of the heater guide tube 30 is attached to the decorative plate 22. Even if the end portion 30A is inclined, the end portion 30A can be easily passed through the third opening 33.

Further, as shown in FIGS. 2 and 8, in the present embodiment, the third opening 33 of the decorative plate 22 can be closed by the lid member 42 when the heater guide tube 30 is not used. Therefore, it is possible to improve the appearance of the decorative plate 22 when the heater guide tube 30 is not used.

As described above, according to the present embodiment, in the structure in which the pipe joint 16 that connects the faucet 14 and the water supply pipe 24 is housed in the faucet box 18, the faucet 14 is not enlarged. From the side, the heater wire 40 can be easily inserted into the heater guide pipe 30 along the water supply pipe.

[Other Embodiments]
Although an example of the embodiment of the present invention has been described above, the embodiment of the present invention is not limited to the above, and may be variously modified and implemented in a range other than the above without departing from the gist thereof. Of course there is.

The first opening 31 in the flat plate 20 is a notch, but the first opening 31 may be a through hole. Although the third opening 33 of the decorative plate 22 is located closer to the water supply pipe 24 than the second opening 32, the position of the third opening 33 is not limited to this.

The guide 34 is provided at an angle θ of 35 to 45° with respect to the flat plate 20, but the angle θ is not limited to this.

The hook portion 36 capable of hooking the end portion 30A of the heater guide tube 30 is provided at a position different from the guide 34 on the flat plate 20, but the hook portion 36 may not be provided. Good.

Although at least a part of the third opening 33 has an elliptical shape that is long in the direction in which the heater guide tube 30 extends, the shape of the third opening 33 is not limited to this.

The lid member 42 that can close the third opening 33 of the decorative plate 22 may not be used.

The disclosure of Japanese Patent Application 2019-7118 filed on January 18, 2019 is referred to in its entirety.
All publications, patent applications, and technical standards mentioned herein are to the same extent as if each individual publication, patent application, and technical standard were specifically and individually referenced. Referenced in the specification.

Claims

A water pipe through which a liquid is flowed, and a pipe joint that connects a water tap attached in a direction intersecting the axial direction of the water pipe,
A faucet box in which the pipe joint is housed,
A flat plate provided on the faucet side of the faucet box and having a first opening for connecting the faucet to the pipe joint;
A second opening that covers the flat plate from the faucet side and enables the faucet to be connected to the pipe joint is formed, and a third opening is formed at a position not overlapping the pipe joint in a front view. With a veneer
Equipped with
A heater guide tube, which is provided along the water supply pipe and allows a heater wire to pass therethrough, can be inserted into the third opening.
The flat plate has a notch at a position overlapping with the third opening of the decorative plate in a front view, and extends obliquely toward the inside of the faucet box with respect to the flat plate, and the tube of the heater guide tube. A pipe joint structure having a guide for directing an end portion on the joint side toward the third opening side.
The pipe joint structure according to claim 1, wherein the third opening of the decorative plate is closer to the water pipe than the second opening.
The pipe joint structure according to claim 1 or 2, wherein the guide is provided at an angle of 35 to 45° with respect to the flat plate.
The hooking portion capable of hooking the end portion of the heater guide tube on the pipe joint side and covered with the decorative plate is provided at a position different from the guide on the flat plate. The pipe joint structure according to claim 3.
The pipe joint structure according to any one of claims 1 to 4, wherein at least a part of the third opening of the decorative plate has an elliptical shape that is long in a direction in which the heater guide tube extends.
The pipe joint structure according to any one of claims 1 to 5, further comprising a lid member capable of closing the third opening of the decorative plate.