Wall-penetrating piping connection structure and bathroom unit equipped with same

Abstract

To provide a through-wall pipe connection structure for hot and cold water and a bathroom unit.SOLUTION: A through-wall pipe connection structure is equipped with: a piping adapter comprising a tubular portion inserted through a wall through-hole, attached to a wall with one end of the tubular portion protruding toward an indoor surface side of the wall, and comprising a joint part for water supply piping on a rear surface of the wall; a shower take-out metal fitting comprising a connection pipe having a screw portion screwed into a screw portion formed on the tubular portion and screwed into the tubular portion and provided to protrude on a surface side of the wall, and a flange portion formed on a wall surface side outer periphery of the connection pipe and covering a protruding portion on the indoor side of the tubular portion; and a joint screwed into an indoor-side end of the connection pipe. The through-wall pipe connection structure comprises: a pressure-relief washer arranged around an indoor-side opening of the wall through-hole and around an outer periphery of the tubular portion; and a tightening ring screwed into the screw portion of the tubular portion and pressing the washer against an indoor-side wall surface of the wall. The pressure-relief washer comprises: a ring portion sandwiched between the tightening ring and the wall; and an outer peripheral projection formed on its outer periphery and interposed between a flange portion outer peripheral edge and a wall surface.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a wall-penetrating piping connection structure and a bathroom unit equipped with the same. [Background technology]

[0002] Generally, in bathroom units in hotels, condominiums, ordinary homes, etc., a shower faucet is attached to the wall. Faucets are often installed on the wash area side of the bathroom, and a shower hose is connected to the bottom of the faucet.

[0003] The faucet fittings are installed at a height that is easy to use when sitting on a bath stool, so when the shower head is hung on the shower hook, the shower hose touches the floor of the washing area, making it easy to get dirty. To solve this problem, a known structure is to run the shower pipe from the faucet behind the wall, then pass it through the wall again and connect the shower hose to it. There are also water softeners that are installed between the faucet fittings and the shower hose to soften the hot water coming out of the shower head, and in this case too, the shower piping is arranged to penetrate the wall (see Patent Document 1).

[0004] In this structure, the wall panel is sandwiched between an adapter on the back side of the wall and a clamping ring on the front side of the wall to ensure watertightness of the through-hole. For example, a packing, washer, and clamping ring are provided between the clamping ring and the wall surface, in that order from the wall surface. In this structure, the clamping ring, packing, and washer have approximately the same diameter.

[0005] The adapter has a female thread that is screwed onto the male thread of a shower fitting, which is used to attach a shower elbow for connecting a shower hose, after wrapping it with sealing tape, for example. The flange of the shower fitting is sized to cover the tightening ring and is screwed in until it touches the wall surface. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-14733 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in conventional structures, if the male thread of the shower attachment fitting is not wrapped with sealing tape when the pipe is connected during installation, there is a risk that water will pass through the clearance in the threads, and water may enter the bathroom through the pipe connection.

[0008] If the water were to flow into the bathroom, there would be no problem for the house, but because the flange part of the shower removal fitting was in contact with the wall surface, water that entered the bathroom would remain there without escaping from the shower removal fitting, and there was a risk that it would leak outside the bathroom due to the clearance between the adapter and the threads of the tightening ring.

[0009] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a through-wall piping connection structure that is configured so that water always flows into the bathroom without the risk of water leaking outside the bathroom, even if sealing tape is forgotten to be wrapped during installation, by simply changing the shape of the washer, without changing the specifications of the adapter, tightening ring, or shower outlet fitting. Another object of the present invention is to provide a bathroom unit equipped with the above-mentioned wall-through piping connection structure. [Means for solving the problem]

[0010] The present invention has the following configuration as a means for solving the above-mentioned problems. (1) The wall-through pipe connection structure of the present invention includes a piping adapter having a tubular portion that passes through a wall-through hole, attached to the wall with one end of the tubular portion protruding toward the indoor surface of the wall, and having a joint portion for a water supply pipe on the back surface of the wall; a connecting pipe having a threaded portion that screws into the threaded portion formed on the tubular portion and is screwed onto the tubular portion, and provided so as to protrude toward the surface of the wall; a shower attachment having a flange portion formed on the outer periphery of the connecting pipe on the wall surface side and covering the protruding portion on the indoor side of the tubular portion; A wall-penetrating piping connection structure having a fitting threaded onto the indoor end of a connecting pipe, the wall-penetrating hole being provided with a pressure relief washer arranged around the outer periphery of the cylindrical portion around the indoor opening thereof, and a tightening ring threaded onto the threaded portion of the cylindrical portion to press the washer against the indoor wall surface of the wall, the pressure relief washer having a ring portion sandwiched between the tightening ring and the wall, and an outer peripheral convex portion formed on the outer periphery of the ring portion and interposed between the outer peripheral edge of the flange portion and the wall surface.

[0011] (2) In the wall-through piping connection structure according to the present invention, a configuration can be adopted in which the outer peripheral edge of the flange portion has a cover wall extending from the outer peripheral edge toward the wall surface, the outer peripheral convex portion of the pressure relief washer member is sandwiched between the indoor end face of the cover wall and the wall surface, and a pressure relief space is formed between the outer peripheral edge of the ring portion on which the outer peripheral convex portion is not formed and the wall surface. (3) In the through-wall pipe connection structure according to the present invention, a configuration can be adopted in which a packing is interposed between the pressure relief washer and the wall surface.

[0012] (4) In the through-wall pipe connection structure according to the present invention, a configuration may be adopted in which three or more of the outer peripheral protrusions are formed on the outer periphery of the ring portion. (5) In the wall-penetrating piping connection structure according to the present invention, a configuration can be adopted in which the inner circumference of the ring portion of the pressure relief washer is formed with three or more inner circumferential convex portions that abut against the outer circumferential surface of the cylindrical portion when the pressure relief washer is inserted into the cylindrical portion of the adapter. (6) In the through-wall pipe connection structure according to the present invention, a shower hose may be connected to the joint.

[0014] ( 7 The bathroom unit according to the present invention is a bathroom unit having a bathtub and a washing area floor and wall, (1) to ( 6 ) is applied, and the piping adapter and the shower removal fitting are attached to the formation portion of the wall through hole formed in the wall facing the washing area floor. [Effects of the Invention]

[0015] According to the wall-through piping connection structure of the present invention, by placing a pressure relief washer between the shower attachment fitting and the wall surface, even if sealing tape is forgotten to be wrapped around the threaded connection part of the shower attachment fitting to the adapter during installation, water can be drained into the bathroom through the gap next to the outer peripheral convex part of the pressure relief washer without leaking outside the bathroom.

[0016] With the through-wall piping connection structure of the present invention, if water entering the bathroom leaks out between the shower fitting and the wall, it is easy and reliable to detect that sealing tape was forgotten to be wrapped around the threaded connection between the shower fitting and the adapter. This allows the threaded connection between the shower fitting and the adapter to be removed, the sealing tape to be rewound, and the shower fitting and the adapter to be reconnected, ensuring the threaded connection is waterproof.

[0017] In the wall-penetrating piping connection structure of the present invention, when the outer peripheral protrusions are arranged at approximately equal intervals circumferentially around the outer periphery of the pressure relief washer, a gap is formed between the shower removal fitting and the wall surface, regardless of the installation direction of the pressure relief washer, and reliable drainage is possible regardless of the direction in which the pressure relief washer is installed.

[0018] In the wall-penetrating piping connection structure of the present invention, when three or more inner peripheral convex portions are provided on the inner peripheral portion of the pressure relief washer, by hooking the inner peripheral convex portions of the pressure relief washer into the valley portions of the threaded portion of the adapter having a threaded portion, it is possible to suppress errors in the mounting position of the pressure relief washer in the up, down, left, and right directions, and to mount the pressure relief washer in an accurate position.

[0019] In addition, the inner circumferential convex portion located on the inner periphery of the pressure relief washer reduces errors in the installation position of the pressure relief washer, so the pressure relief washer can be installed without protruding unnecessarily from the shower removal fitting, resulting in excellent design, as well as excellent drainage performance and excellent water leakage prevention function.

[0020] The bathroom unit of the present invention can provide a bathroom unit that can drain water into the bathroom through the gap next to the outer convex portion of the pressure relief washer without leaking water outside the bathroom, even if sealing tape is forgotten to be wrapped around the threaded connection between the shower removal fitting and the adapter during installation. In addition, a bathroom unit can be provided that has the effects obtained from the above-mentioned wall-through piping connection structure. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view showing an overview of a bathroom unit. [Figure 2] An oblique view showing the opposite side of the bathroom unit shown in Figure 1. [Figure 3A] 3 is an exploded perspective view of the shower attachment fitting, a tightening ring, a washer member, a packing member, and a piping adapter according to the first embodiment. FIG. [Figure 3B] FIG. 10 is a perspective view showing a state in which the packing member is attached to the piping adapter. [Figure 3C] FIG. 10 is a perspective view showing a state in which a packing member and a washer member are attached to a piping adapter. [Figure 3D] FIG. 10 is a perspective view showing a state in which a packing member, a washer member, and a fastening ring are attached to a piping adapter. [Figure 3E] 10 is a perspective view showing the state in which the gasket member, washer member, tightening ring, and shower mounting bracket are attached to the piping adapter. FIG. [Figure 3F] 10 is a perspective view showing a state in which a shower elbow is placed opposite a piping adapter equipped with a packing member, a washer member, a tightening ring, and a shower mounting bracket. FIG. [Figure 3G]FIG. 10 is a perspective view showing the shower elbow connected to the piping adapter. [Figure 3H] FIG. 1 is a perspective view showing a shower hose connected to a shower elbow. [Figure 4] FIG. 2 is a cross-sectional view showing the entire through-wall piping connection structure. [Figure 5A] 5 is a front view showing a first example of a packing member applied to the through-wall piping connection structure shown in FIG. 4. FIG. [Figure 5B] 5 is a front view showing a second example of a packing member that can be applied to the through-wall pipe connection structure shown in FIG. 4. FIG. [Figure 5C] 5 is a front view showing a third example of a packing member that can be applied to the through-wall pipe connection structure shown in FIG. 4. FIG. [Figure 5D] 5 is a front view showing a fourth example of a packing member that can be applied to the through-wall pipe connection structure shown in FIG. 4. FIG. [Figure 5E] 5 is a front view showing a fifth example of a packing member that can be applied to the through-wall piping connection structure shown in FIG. 4. FIG. [Figure 5F] 5 is a front view showing a sixth example of a packing member that can be applied to the through-wall piping connection structure shown in FIG. 4. [Figure 6A] FIG. 10 is an exploded perspective view of a shower attachment fitting, a fastening ring, a washer member, a packing member, and a piping adapter according to a comparative example. [Figure 6B] FIG. 10 is a perspective view showing a comparative example in which a packing member is attached to a piping adapter. [Figure 6C] FIG. 10 is a perspective view showing a comparative example in which a packing member and a washer member are attached to a piping adapter. [Figure 6D] FIG. 10 is a perspective view showing a comparative example in which a packing member, a washer member, and a fastening ring are attached to a piping adapter. [Figure 6E] FIG. 10 is a perspective view showing a comparative example in which a gasket member, a washer member, a tightening ring, and a shower mounting bracket are attached to a piping adapter. [Figure 6F] FIG. 10 is a perspective view showing a comparative example in which a shower elbow is opposed to a piping adapter equipped with a gasket member, a washer member, a tightening ring, and a shower mounting bracket. [Figure 6G]FIG. 10 is a perspective view showing a comparative example in which a shower elbow is connected to a piping adapter. [Figure 6H] FIG. 10 is a perspective view of a comparative example showing a shower hose connected to a shower elbow. [Figure 7A] FIG. 10 is a front view showing a portion of a through-wall pipe connection structure of a comparative example. [Figure 7B] FIG. 10 is a partial cross-sectional view showing the entire through-wall pipe connection structure of a comparative example. [Figure 7C] FIG. 10 is a cross-sectional view showing the entire through-wall pipe connection structure of a comparative example. [Figure 8A] FIG. 10 is an exploded perspective view of a shower attachment fitting, a fastening ring, a washer member, and a piping adapter according to a second embodiment. [Figure 8B] FIG. 10 is a perspective view showing a state in which a washer member is attached to a piping adapter according to a second embodiment. [Figure 8C] FIG. 10 is a perspective view showing a state in which a washer member and a fastening ring are attached to a piping adapter according to a second embodiment. [Figure 8D] FIG. 10 is a perspective view showing a state in which a washer member, a tightening ring, and a shower mounting bracket are attached to a piping adapter according to a second embodiment. [Figure 8E] FIG. 10 is a perspective view showing a state in which a shower elbow faces a piping adapter according to a second embodiment. [Figure 8F] FIG. 10 is a perspective view showing a state in which a shower elbow is connected to a piping adapter according to a second embodiment. [Figure 8G] FIG. 10 is a perspective view showing a shower hose connected to a shower elbow according to a second embodiment. [Figure 9] FIG. 6 is a cross-sectional view showing the entire through-wall pipe connection structure according to a second embodiment. [Figure 10A] FIG. 10 is an exploded perspective view of a shower attachment fitting, a fastening ring, a washer member, a packing member, and a piping adapter according to a modified example. [Figure 10B] FIG. 10 is a perspective view showing a state in which a packing member is attached to a piping adapter according to a modified example. [Figure 10C] FIG. 10 is a perspective view showing a state in which a packing member and a washer member are attached to a piping adapter according to a modified example. [Figure 10D] FIG. 10 is a perspective view showing a state in which a packing member, a washer member, and a fastening ring are attached to a piping adapter according to a modified example. [Figure 10E] FIG. 10 is a perspective view showing a state in which a packing member, a washer member, a tightening ring, and a shower mounting bracket are attached to a piping adapter according to a modified example. [Figure 10F] FIG. 10 is a perspective view showing a state in which a shower elbow is opposed to a piping adapter equipped with a packing member, a washer member, a tightening ring, and a shower mounting bracket according to a modified example. [Figure 10G] FIG. 10 is a perspective view showing a state in which a shower elbow is connected to a piping adapter according to a modified example. [Figure 10H] FIG. 10 is a perspective view showing a shower hose connected to a modified shower elbow. [Figure 11] FIG. 10 is a cross-sectional view showing the entire through-wall pipe connection structure according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0022] "First embodiment" A first embodiment of the present invention will be described in detail below with reference to the drawings. In some drawings, some of the detailed reference numerals used in other drawings are omitted. 1 and 2, the reference numeral 1 indicates a bathroom unit, which includes a washing area floor 110, a wall (panel wall) 120 placed on the outer periphery of the washing area floor 110, a ceiling (not shown) installed above the wall 120, a bathtub 2, a faucet 3, a water softener 4, and a counter 5. An apron 140 is provided at the boundary between the bathtub 2 and the washing area floor 110. The washing area floor 110 is formed in a rectangular shape in a plan view, and a drain outlet 111 is formed in the center of the long side of the washing area floor 110 that is closer to the bathtub 2.

[0023] The water softening device 4 is arranged along a wall surface 121 above the washing area floor 110, and above the water softening device 4, a counter 5 and a faucet device 3 are arranged along the wall surface 121. The faucet device 3 has a shower outlet, and as shown in FIG. 2, a water supply pipe 710 and a hot water supply pipe 720 are arranged along the back side of the wall 120. The shower outlet is connected to a water supply pipe 730 for the water softening device via the wall 120, and the water supply pipe 730 is arranged along the back side of the wall 120 and connected to the water softening device 4. A soft water supply pipe 740 for the water softener is arranged from the water softener 4 along the back side of the wall 120, and the soft water supply pipe 740 passes through the wall 120 and is connected to a shower removal fitting 360 made of plated brass, and a shower elbow (joint) 370 and a shower hose 380 are attached to the shower removal fitting 360 to allow water to flow to the shower head 390.

[0024] 3 and 4 show a through-wall pipe connection structure 100 according to a first embodiment, which has improved design and allows for the release of internal pressure. As shown in Figure 4, a co-rotation prevention member 6 and a piping adapter 310 are provided on the back side of wall 120 to prevent co-rotation, and a tightening ring 350 is provided on the indoor wall surface side of wall 120 from the wall surface 121 side, via packing 320 and a ring-shaped pressure relief washer 340, and this tightening ring 350 presses and fixes packing 320 and pressure relief washer 340 against wall surface 121. A cylindrical portion 310A is formed on the wall 120 side of the adapter 310, and this cylindrical portion 310A is inserted into the wall through-hole 122 from the back side of the wall 120, with the tip portion 310a of the cylindrical portion 310A protruding slightly from the wall surface 121 of the wall 120 toward the inside of the room.

[0025] An adapter male thread (threaded portion) 312 is formed on the outer peripheral surface of the cylindrical portion 310A, and a clamping ring female thread (threaded portion) 351 on the inner peripheral side of the clamping ring 350 is screwed onto this adapter male thread 312. By screwing the clamping ring female thread 351 onto the adapter male thread 312, the clamping ring 350 is threadedly coupled to the outer periphery of the cylindrical portion 310A, so that the pressure relief washer 340 and the packing 320 can be pressed against the wall surface 121 of the wall 120 by the clamping ring 350.

[0026] In the adapter 310, a flange 310B is formed on the back surface of the wall 120, and this flange 310B is disposed on the back surface of the wall 120, pressing the co-rotation prevention member 6 against the back surface of the wall 120. A dome-shaped connecting portion 310C is formed on the outside of the flange 310B, covering the inner opening of the flange 310B, which is formed at the opening on the back surface of the wall of the cylindrical portion 310A. A joint 310D for connecting piping is formed at the bottom of this connecting portion 310C. A soft water supply pipe 740 is connected to this joint 310D. The flange portion 310B is pressed against the back side of the wall 120 via the anti-rotation member 6, and the pressure relief washer 340 and the packing 320 are pressed against the wall surface 121 side of the wall 120 by the tightening ring 350, so that the adapter 310 is fixed to the wall 120 while penetrating the wall 120.

[0027] The shower removal fitting 360 has a connecting pipe 360A, the outer surface of which is formed with a shower removal fitting male thread (threaded portion) 362. Furthermore, the inner surface of the aforementioned cylindrical portion 310A is formed with an adapter female thread (threaded portion) 311. The shower removal fitting 360 is threadedly coupled to the adapter 310 by threading the shower removal fitting male thread 362 into the adapter female thread 311, and the connecting pipe 360A is inserted into the inside of the cylindrical portion 310A and threadedly coupled to the adapter 310, and protrudes from the indoor side of the wall 120.

[0028] In shower removal fitting 360, disk-shaped flange 360B is formed on the inside of the room from tip 310a of cylindrical portion 310A. The outer diameter of flange 360B is slightly larger than the outer diameter of fastening ring 350, and a cylindrical cover wall 360C is formed on the outer periphery of flange 360B, extending toward the wall surface of wall 120. Cover wall 360C is formed so that tip 360D on the wall surface side of wall 120 is positioned near the wall surface of wall 120 to cover and conceal fastening ring 350, pressure relief washer 340, and packing 320 from the indoor side.

[0029] An inner cylindrical portion 360E is formed on the indoor side of the flange portion 360B of the shower removal fitting 360, and a shower removal fitting female thread (thread portion) 361 is formed on the inner circumferential surface of this inner cylindrical portion 360E. A shower hose 380 is threadedly connected to the indoor side of the shower removal fitting 360 via an L-shaped shower elbow 370. Shower elbow male threads (thread portions) 371 are formed on each of one end and the other end of the shower elbow 370. The shower elbow 370 is joined to the inner cylindrical portion 360E by threading the shower elbow male thread 371 on one end of the shower elbow into the shower removal fitting female thread 361 on the inner cylindrical portion 360E. The shower elbow male thread 371 on the other end of the shower elbow 370 is threadedly fitted with the base end of a coupling member 382 equipped with a shower hose female thread 381, and the tip end of this coupling member 382 is connected to the base end 383 of a shower hose 380.

[0030] In the above-described structure, pressure relief washer 340 is generally made up of a ring portion 340A, and four inner peripheral protrusions 342 are formed at 90° intervals around the inner circumference of ring portion 340A. When pressure relief washer 340 is fitted onto the outer periphery of cylindrical portion 310A of adapter 310, the tips of the four inner peripheral protrusions 342 are slightly crushed so that cylindrical portion 310A can be fitted onto the outer periphery of pressure relief washer 340. Therefore, the tip of the inner peripheral convex portion 342 engages with the root portion of the adapter male thread 312 of the adapter 310 while being slightly deformed, which makes it easy to accurately position the pressure relief washer 340.

[0031] The outer diameter of the ring portion 340A of the pressure relief washer 340 is formed slightly smaller than the inner diameter of the cover wall 360C of the shower removal fitting 360, and the outer periphery of the pressure relief washer 340 is provided with outer peripheral protrusions 341 of the shape shown in Figure 5A in four directions at equal intervals around the periphery. In the pressure relief washer 340, the outer peripheral protrusion 341 is sized to protrude outward from the outer peripheral edge of the tightening ring 350 when the pressure relief washer 340 is fitted onto the cylindrical portion 310A of the adapter 310 as shown in Figure 4. Furthermore, the outer peripheral protrusion 341 is sized to be pressed against the wall surface 121 by the tip 360D of the shower attachment fitting 360 when the tip 360D is brought close to the wall surface, and to be sandwiched between the tip 360D and the wall surface 121. Note that when the tip 360D is pressed against the wall surface 121, the outer peripheral edge of the outer peripheral protrusion 341 is preferably positioned inward from the outer peripheral edge of the tip 360D so that the outer peripheral edge is difficult to see from inside the room.

[0032] The pressure relief washer 340 may not be flat, but may have a shape that takes into consideration the thickness of the packing 320 . The pressure relief washer 340 is preferably formed by punching, but may also be formed by injection molding. The material of the pressure relief washer 340 is preferably polyethylene, but other resin materials such as polypropylene may also be used. The color of pressure relief washer 340 is preferably translucent so as not to affect the various types of wall surface 121, including dark and light colors. For example, if the color is white or black, depending on the color of wall surface 121, outer peripheral protrusion 341 of pressure relief washer 340 will be too conspicuous and the design will be compromised. By making the color translucent so as not to affect wall surface 121, it is possible to provide a highly designed through-wall piping connection structure 100 that does not detract from the aesthetic appearance of the bathroom unit.

[0033] 4, as shown in FIG. 3A, shower removal fitting 360 is assembled by threading shower removal fitting male thread 362 of shower removal fitting 360 into adapter female thread 311 of adapter 310 provided on wall 120 (see FIGS. 3B, 3C, 3D, and 3E). At this time, outer peripheral protrusion 341 of pressure relief washer 340 is sandwiched between tip 360D of cover wall 360C and wall surface 121 of wall 120, and is deformed during assembly. In this way, the pressure relief washer 340 is interposed between the shower attachment fitting 360 and the wall surface 121, so that a pressure relief space 364 shown in FIG. 4 can be formed between the shower attachment fitting 360 and the wall surface 121. By providing the pressure relief space 364, pressure applied to the inside of the shower attachment 360 can be released.

[0034] Next, shower elbow 370 can be connected to shower attachment fitting 360 by threading shower elbow male thread 371 of shower elbow 370 into shower attachment fitting female thread 361. Shower hose 380 can be connected to shower elbow 370 by threading shower hose female thread 381 of coupling member 382 equipped with shower hose 380 into the other shower elbow male thread 371.

[0035] When installing the through-wall piping connection structure 100 shown in Figure 4, when screwing the connecting pipe 360A of the shower attachment 360 into the cylindrical portion 310A of the adapter 310, the screw connection work is usually carried out after a waterproof layer such as sealing tape is applied to the outer surface of the connecting pipe 360A. However, if sealing tape is not applied during on-site installation, water may leak inside cover wall 360C through the clearance in the threads of shower attachment male thread 362 and adapter female thread 311. Even in this case, there is no risk of water leakage because pressure relief space 364 is provided as shown in Figure 4, allowing water to pass through pressure relief space 364 and reach bathroom wall 121 and washing area floor 110.

[0036] If the pressure relief space 364 were not provided, water accumulating inside the cover wall 360C could seep in between the adapter male thread 312 and the tightening ring female thread 351 and could find its way around to the back side of the wall 120 through the wall through-hole 122. In the through-wall pipe connection structure 100 shown in FIG. 4, a pressure relief washer 340 is used to provide a pressure relief space 364 between the tip 360D of the shower attachment 360 and the wall surface 121, thereby solving the above problem.

[0037] According to the structure of the first embodiment, if water entering the bathroom from the soft water supply pipe 740 were to leak out between the shower attachment fitting 360 and the wall surface 121, it would be easy and reliable to detect that sealing tape had been forgotten to be wrapped around the threaded joint between the shower attachment fitting 360 and the adapter 310. This would allow the threaded joint between the shower attachment fitting 360 and the adapter 310 to be removed, the sealing tape rewound, and the shower attachment fitting 360 and the adapter 310 to be reconnected, ensuring that the threaded joint is waterproof. In the first embodiment, when the outer peripheral protrusions 341 are arranged at approximately equal intervals around the outer periphery of the pressure relief washer 340, a gap is formed between the shower removal fitting 360 and the wall surface 121, regardless of the installation direction of the pressure relief washer 340, and regardless of the direction in which the pressure relief washer 340 is installed, reliable drainage as described above is possible.

[0038] The pressure relief washer 340 is not limited to the configuration shown in FIG. 5A, and various configurations shown in FIGS. 5B to 5F can be adopted. The pressure relief washer 340 shown in Fig. 5B has eight outer peripheral protrusions 341 around the outer periphery, and the pressure relief washer 340 shown in Fig. 5C has three outer peripheral protrusions 341 around the outer periphery. As shown in Figs. 5A to 5C, the number of outer peripheral protrusions 341 provided may be any number. The pressure relief washer 340 shown in FIG. 5D has eight inner circumferential protrusions 342 around the inner circumference, the pressure relief washer 340 shown in FIG. 5E has three inner circumferential protrusions 342 around the inner circumference, and the pressure relief washer 340 shown in FIG. 5F has four inner circumferential protrusions 342 around the inner circumference, but the tip of each inner circumferential protrusion 342 has a sharp shape.

[0039] As shown in Figures 5D to 5F, any number of inner peripheral convex portions 342 may be provided, and various shapes may also be adopted for the inner peripheral convex portions 342. In particular, when sharp inner peripheral convex portions 342 are formed as shown in Figure 5F, the inner peripheral convex portions 342 formed on the inner periphery of the pressure relief washer 340 deform and reliably engage with the root portions of the adapter male thread 312 of the adapter 310, which has the advantage of facilitating positioning of the pressure relief washer 340.

[0040] "Comparative Example" The through-wall piping connection structure 100A shown in Figures 6A to 6H and Figures 7A to 7C is a comparative example in which the through-wall piping connection structure 100 shown in Figures 3 and 4 is replaced with a simple ring-shaped washer 330 shown in Figures 6A and 6B instead of the pressure relief washer 340. The same components as those in the through-wall pipe connection structure 100A are given the same reference numerals and the description thereof will be omitted. In the comparative example configuration shown in these figures, ring-shaped washer 330 is provided, so that tip portion 360D of shower removal fitting 360 abuts against wall surface 121 of wall 120 as shown in FIGS. 7B and 7C. In this configuration, the inside of the cover wall 360C of the shower attachment fitting 360 is an enclosed space. Therefore, if water accumulates in this sealed space, it may seep in between the adapter male thread 312 and the fastening ring female thread 351 and may find its way around to the back side of the wall 120 through the wall through-hole 122. In other words, there is a risk of water leaking outside the bathroom unit. The through-wall pipe connection structure 100 shown in Figs. 3 and 4 described above does not have such a problem, and therefore has a structure with excellent drainage properties.

[0041] "Second embodiment" Figures 8 and 9 are intended to show a second embodiment of the wall-penetrating piping connection structure 100B according to the present invention, and components equivalent to those of the first embodiment of the wall-penetrating piping connection structure 100A are given the same symbols, and descriptions of the same components will be omitted. In the through-wall piping connection structure 100B of the second embodiment, the packing 320 provided in the first embodiment is omitted, and only a pressure relief washer 340 is provided between the tightening ring 350 and the wall surface 121. The construction is performed in the order shown in Figures 8A to 8G, and the structure shown in Figure 9 can be obtained. In the through-wall pipe connection structure 100B, by providing the pressure relief space 364 between the tip 360D of the shower attachment 360 and the wall surface 121, the above-mentioned problem can be solved.

[0042] In the structure of the first embodiment, the packing 320 is disposed between the wall surface 121 and the pressure relief washer 340, but the members subsequent to the shower pull-out fitting 360 are downstream of the faucet device 3. Furthermore, since the shower attachment 360 is connected to the faucet 3 via the water softener 4, the connecting members after the water softener 4 are not subjected to pressure above a certain level. Furthermore, a pressure relief washer 340 can be sandwiched between the shower attachment 360 and the wall surface 121 to provide a pressure relief space 364 . Therefore, even if water attempts to stagnate inside the shower removal fitting 360, it is always possible to drain the water into the bathroom unit 1 from the depressurization space 364, and there is no possibility of water leaking outside the bathroom unit 1, so a structure that omits the gasket 320 as in the second embodiment may be adopted.

[0043] "Third embodiment" Figures 10A to 10H and Figure 11 show a third embodiment of a wall-penetrating piping connection structure 100C according to the present invention, and components equivalent to those of the wall-penetrating piping connection structure 100 of the first embodiment are given the same symbols, and descriptions of the same components will be omitted. In the third embodiment of the wall-penetrating piping connection structure 100C, the gasket 320 and washer 330 that were provided in the comparative example are provided between the tightening ring 350 and the wall surface 121, and multiple drainage holes 363 are provided in the cover wall 360C of the shower removal fitting 360.

[0044] In the through-wall pipe connection structure 100C, the cover wall 360C is provided with a drain hole 363, which prevents an increase in internal pressure inside the cover wall 360C. In other words, even if water attempts to accumulate inside the shower attachment fitting 360, the pressure can be released and the water can be drained through the drain hole 363 of the shower attachment fitting 360. This prevents the risk of water leaking outside the bathroom unit.

[0045] However, in the structure of the third embodiment, the drain holes 363 are provided on the outer peripheral design surface of the shower removal fitting 360, which causes a problem of poor design. In this regard, the structures of the first and second embodiments described above do not have the drain hole 363, and therefore have excellent design. [Explanation of symbols]

[0046] 1...bathroom unit, 110...washing area floor, 111...drain, 120...wall, 121...wall surface, 122...wall penetration hole, 2...bathtub, 3...faucet fixture, 310...piping adapter, 310A...cylindrical part, 310D...joint part, 311...adapter female thread, 312...adapter male thread, 320...packing, 330...washer, 340...pressure relief washer, 340A...ring part, 341...outer peripheral convex part, 342...inner peripheral convex part, 350...tightening ring, 351... Tightening ring female screw, 360... shower removal fitting, 360A... connecting pipe, 360B... flange portion, 360C... cover wall, 361... shower removal fitting female screw, 362... shower removal fitting male screw, 364... pressure relief space, 370... shower elbow (joint), 371... shower elbow male screw, 380... shower hose, 390... shower head, 4... water softening device, 5... counter, 6... co-rotation prevention member, 740... soft water supply piping.

Claims

1. a piping adapter having a cylindrical portion that is inserted into a wall through-hole, attached to the wall with one end of the cylindrical portion protruding toward the indoor surface of the wall, and having a joint portion for a water supply pipe on the back surface of the wall; a connecting pipe that has a threaded portion that threads onto the threaded portion formed on the cylindrical portion and is threaded onto the cylindrical portion, and that protrudes toward the surface of the wall; and a shower attachment that has a flange portion that is formed on the outer periphery of the connecting pipe on the wall surface side and that covers and conceals the protruding portion of the cylindrical portion on the indoor side; A through-wall piping connection structure including a fitting screwed to the indoor end of the connecting pipe, A pressure relief washer is disposed around the outer periphery of the cylindrical portion around the indoor opening of the wall through-hole, and a tightening ring is screwed onto the threaded portion of the cylindrical portion to press the washer against the indoor wall surface of the wall, A wall-penetrating piping connection structure characterized in that the pressure relief washer has a ring portion that is sandwiched between the tightening ring and the wall, and an outer peripheral convex portion that is protruded from the outer periphery of the ring portion and is interposed between the outer peripheral edge of the flange portion and the wall surface.

2. The wall-through piping connection structure described in claim 1, characterized in that the flange portion has a cover wall extending from the outer peripheral edge toward the wall surface, the outer peripheral convex portion of the pressure relief washer member is sandwiched between the indoor end face of the cover wall and the wall surface, and a pressure relief space is formed between the outer peripheral edge of the ring portion where the outer peripheral convex portion is not formed and the wall surface.

3. 3. The through-wall piping connection structure according to claim 1, wherein a packing is interposed between the pressure relief washer and the wall surface.

4. The wall-through pipe connection structure according to any one of claims 1 to 3, characterized in that three or more of the outer peripheral convex portions are formed on the outer periphery of the ring portion.

5. A wall-penetrating piping connection structure as described in any one of claims 1 to 4, characterized in that three or more inner peripheral convex portions are formed on the inner circumference of the ring portion of the pressure relief washer, which abut against the outer peripheral surface of the cylindrical portion when the pressure relief washer is inserted into the cylindrical portion of the adapter.

6. The through-wall piping connection structure according to any one of claims 1 to 5, characterized in that a shower hose is connected to the joint.

7. A bathroom unit characterized in that the wall-penetrating piping connection structure described in any one of claims 1 to 6 is applied to a bathroom unit having a bathtub, a washing area floor, and a wall, and the piping adapter and the shower removal fitting are attached to the formation portion of the wall-penetrating hole formed in the wall facing the washing area floor.

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