Adapter and fluid pipe flow path arrangement structure

Abstract

The object is to prevent the connection portion of the fluid pipe with the joint from being deformed into a buckling state due to linear expansion of the fluid pipe caused by heat. [Solution] Joint cover C 11 An adapter A1 is disposed between the passage 20 and the pipe protection cover C2, and the inclined piping section P2a of the fluid pipe P2 disposed in the flow path arrangement space 41 of the adapter A1 is supported by a pair of intrusion prevention sections 32 formed integrally with the adapter A1, thereby preventing the inclined piping section P2a of the fluid pipe P2 from intruding into the installation surface F due to linear expansion caused by heat, thereby preventing buckling deformation of the inclined piping section P2a.

Description

[Technical Field]

[0001] The present invention relates to an adapter that can prevent a connection portion of a fluid pipe with a coupling from being deformed into a buckling state due to linear expansion of the fluid pipe caused by heat, and to a flow path arrangement structure for a fluid pipe. In this specification, the term "flow path" refers to a passage through which a fluid flows through a fluid pipe and a pipe joint that connects the fluid pipe. [Background technology]

[0002] 4 of Patent Document 1 shows that a straight joint A1 connecting a small-diameter fluid pipe P1 and a large-diameter fluid pipe P2 is restricted by restricting bodies R1 and R2 fixed to a base V1 of a pipe joint housing protective cover to prevent axial movement of the fluid pipes P1 and P2, even if the fluid pipes P1 and P2 undergo linear expansion due to heat. As a result, the thermal expansion of one of the fluid pipes P1 and P2 is blocked from being transmitted to the other at the straight joint A1, so that the linear expansion of multiple fluid pipes connected by the pipe joints is concentrated in one location, preventing damage to a specific location due to excessive load caused by linear expansion.

[0003] However, due to the difference in diameter between the two fluid pipes P1, P2, the axial center holding position of the fluid pipe protective cover holding the large-diameter fluid pipe P2 and the axial center holding position of the fluid pipe protective cover holding the small-diameter fluid pipe P1 are misaligned in the vertical direction, and to eliminate this misalignment, the straight joint A1 is positioned at a slight incline, and the connection portion of the small-diameter fluid pipe P1 with the straight joint A1 is bent slightly downward. Note that the connection portion of the large-diameter fluid pipe P2 with the straight joint A1 is prevented from bending by a restrictor R2, maintaining the horizontal axis.

[0004] As a result, the linear expansion of the small diameter fluid pipe P1 is concentrated in the slightly downwardly curved portion described above, causing the small diameter fluid pipe P1 to deform in a buckled state so as to further increase the downward curvature of that portion, resulting in a problem in which the connection between the straight joint A1 and the small diameter fluid pipe P1 becomes unstable. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-143029 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to prevent a connection portion of a fluid pipe with a joint from being deformed into a buckling state due to linear expansion of the fluid pipe caused by heat. [Means for solving the problem]

[0007] The invention of claim 1 to solve the above problem is: An adapter is attached to a port through which the fluid pipe is drawn out to the outside in a joint cover which is connected to a fluid pipe that is arranged in a straight line along an installation surface and has an accommodation space formed therein for accommodating a joint that forms a flow path together with the fluid pipe, a joint cover side connecting portion that is inserted into the passage hole is provided at one end side of the adapter body, and a pipe protection cover side connecting portion that is fitted externally or internally to an end of a pipe protection cover that has an internal storage space for the fluid pipe drawn out from the joint cover to the outside is provided at the other end side, and an arrangement space for the flow path is formed inside the adapter body, continuing from the one end side to the other end side; the fluid passage arrangement space has an inclined piping section inclined so that the axis of the fluid pipe arranged in the arrangement space gradually approaches the installation surface from the joint toward the pipe protective cover, The adapter body is characterized in that an intrusion prevention section is provided on the installation surface side of the inclined piping section in at least one of the joint cover in the adapter body and the arrangement space of the flow path, with a predetermined gap from the installation surface, and abuts against at least one of the fluid pipe and the joint that tends to intrude into the gap due to linear expansion of the fluid pipe due to heat, thereby preventing the fluid pipe and the joint from intruding into the gap.

[0008] According to the invention of claim 1, a fluid pipe is connected to a fitting housed in a fitting cover, the fitting and the fluid pipe form a flow path, and the fluid pipe is disposed in an installation space of an adapter body attached to the through hole of the fitting cover. The fluid pipe forming the flow path is disposed inside the adapter, and a fitting cover-side connection part and a pipe protection cover-side connection part are formed at both ends of the flow path in the adapter, and each connection part of the adapter is connected to the fitting cover and the pipe protection cover, respectively, and the fluid pipe drawn out from the fitting cover and disposed in the installation space of the adapter body is piped so that the distance between its axis and the installation surface gradually decreases with increasing distance from the fitting, so that the fluid pipe, part of which is disposed in the adapter in an inclined piping state, is housed and held in the pipe protection cover.

[0009] In other words, the fluid pipe pulled out from the joint cover is arranged in an inclined state in the arrangement space inside the adapter body, and its axis is arranged at an angle so that it gradually approaches the installation surface from the joint toward the pipe protection cover, and the axis of the fluid pipe contained and held in the pipe protection cover remains at the same height as the installation surface.

[0010] When the fluid pipe is a hot water supply pipe, the fluid pipe expands due to thermal linear expansion, and the thermal linear expansion is concentrated (accumulated) at a specific location. The linear expansion is often concentrated at both end connections, where the resistance to bending deformation of the fluid pipe is high, and is rarely concentrated at the middle portion. As a result, in the invention of claim 1, one end of the fluid pipe is connected to a fitting housed in a fitting cover, and the portion of the fluid pipe extending from the fitting cover to the outside and disposed at an angle in the installation space of the adapter body is arranged at an angle such that the distance between the axis of the fluid pipe and the installation surface decreases with increasing distance from the fitting cover. Therefore, the thermal linear expansion of the fluid pipe is concentrated at the inclined portion of the fluid pipe disposed in the installation space of the adapter body. In other words, the portion of the fluid pipe disposed in the installation space of the adapter body is slightly curved toward the installation surface, and the linear expansion of the fluid pipe tends to bend the fluid pipe further, concentrating at the curved portion of the fluid pipe. However, an intrusion prevention section, which is provided upstream of the flow path provided in the installation space of the adapter body near the fitting cover and against which at least one of the fluid pipe and the fitting in the fitting cover connecting the fluid pipe abuts, is provided with a predetermined gap between it and the installation surface. When at least one of the fluid pipe and the fitting abuts against the intrusion prevention section, the fluid pipe is prevented from intruding into the gap. As a result, thermal linear expansion of the fluid pipe is prevented from concentrating at the curved portion of the fluid pipe and bending it toward the installation surface in a buckling manner. For example, by bending a straight portion of a considerable length of fluid pipe in either direction with a large radius of curvature, the thermal linear expansion of the fluid pipe is dispersed without concentrating at the end of the fitting. This prevents problems such as partial damage and water leakage at the connection between the fluid pipe and the fitting.

[0011] The invention of claim 2 is the invention of claim 1, a split opening that allows the entire fluid pipe to pass through is formed over the entire length of the flow path of the adapter body in a portion of the adapter body facing the installation surface, and the adapter body is entirely flexible and deformable in a direction in which the width of the split opening changes; The anti-entrapment portion is characterized in that a pair of portions are formed on the side of the adapter body that is connected to the joint cover, perpendicular to the flow path and spaced a predetermined distance apart in the width direction of the split opening.

[0012] According to the invention of claim 2, the adapter body has a split opening formed over the entire length of the flow path of the adapter body in the part facing the installation surface, which allows the entire fluid pipe to pass through. Therefore, even after the fluid pipe has been installed and the joint cover and pipe protection cover for the fluid pipe have been installed, the adapter can be installed by pushing it between the joint cover and the pipe protection cover from above. In other words, the adapter can be attached even after the piping has been completed.

[0013] The invention of claim 3 is the invention of claim 2, a locking portion that is locked to a locked portion formed on the joint cover is formed on the joint cover side connection portion of the adapter body, the locking portion is movable between an unlocked position spaced apart from the inner surface of the joint cover and an locked position in proximity to the inner surface of the joint cover due to a flexural deformation of the entire adapter body, The fluid pipe arrangement surfaces of the pair of intrusion prevention portions are characterized by being formed in an arcuate shape that moves away from the installation surface as it moves from the non-engaging position of the engaging portion to the engaging position.

[0014] According to the invention of claim 3, the fluid pipe installation surfaces of a pair of anti-entry portions provided on the adapter body are formed in the shape of an arc that moves away from the installation surface as it moves from the non-engaging position of the engaging portion to the engaging position.Therefore, when the fluid pipe is thermally deformed to either side due to linear expansion caused by heat, the engaging portion formed on the adapter body moves toward the engaged portion formed on the joint cover, making the engagement between the engaging portion of the adapter body and the engaged portion of the joint cover even more secure, and preventing the adapter from coming off. Furthermore, even if thermal deformation of the fluid pipe causes the fluid pipe to bend downward even more and acts to press against the pair of anti-entrapment portions, the locking portion of the adapter main body is moved toward the locked portion of the joint cover, making the locking of the two more secure.In addition, the locking portion of the adapter main body cannot move closer to the locked portion of the joint cover more than a certain point, and the locking portion presses against the locked portion.This relationship also prevents the fluid pipe from being further bent toward the installation surface.

[0015] The invention of claim 4 is as follows: A plurality of fluid pipes arranged along the installation surface are connected by a single joint to form a continuous flow path; At least two of the plurality of fluid pipes are housed and piped in respective pipe protection covers that form housing spaces therein, and are held by a holding part that maintains a state in which the axial positions of the fluid pipes are determined with respect to the installation surface, The joint to which the plurality of fluid pipes are connected is accommodated in an accommodation space inside the joint cover, two specific fluid pipes among the plurality of fluid pipes have different distances between the axis of each fluid pipe and the installation surface when held by the holding portion of each protective cover; Of the two specific fluid pipes, the adjacent fluid pipe whose axis is held at a position relatively close to the installation surface has an inclined piping section formed between the joint and a holding section of a pipe protection cover that holds the adjacent fluid pipe, the inclined piping section being inclined so as to gradually approach the installation surface, This is a fluid pipe flow path arrangement structure, characterized in that the gap formed between the installation surface and at least one of the inclined piping section and the joint is provided with an intrusion prevention section that abuts against at least one of the adjacent fluid pipes and the joint that attempts to intrude into the gap due to thermal linear expansion of at least one of the two specific fluid pipes, thereby preventing the fluid pipe and at least one of the joint from intruding into the gap.

[0016] The invention of claim 4 relates to a device in which a plurality of fluid pipes arranged along an installation surface are connected by a single fitting to form a continuous flow path, one of two specific fluid pipes among the plurality of fluid pipes is an adjacent fluid pipe whose axis is held in a position relatively close to the installation surface, and a piping portion is formed between the fitting and a holding portion of a pipe protective cover that holds the adjacent fluid pipe, the piping portion being inclined so as to gradually approach the installation surface. In other words, when the specific two fluid pipes are housed and held in the pipe protective cover, the heights of their axes relative to the installation surface are different, so when the two fluid pipes including the adjacent fluid pipe are connected to the fitting, a bent portion generally occurs at the connection portion of the adjacent fluid pipe with the fitting, and the bent portion of the fluid pipe is disposed inside the adapter formed between the fitting and the holding portion of the pipe protective cover that holds the adjacent fluid pipe. Furthermore, in the gap formed between the installation surface and at least one of the inclined piping portion of the adjacent fluid pipe and the joint, an intrusion prevention portion is provided that abuts at least one of the adjacent fluid pipe and the joint that attempts to enter the gap due to thermal linear expansion of at least one of the two specific fluid pipes, preventing the adjacent fluid pipe and the joint from entering the gap.As described in the effect of the invention of claim 1, due to the presence of the intrusion prevention portion, thermal linear expansion is not concentrated in the curved portion of the adjacent fluid pipe, but is dispersed to other portions, thereby preventing buckling deformation from occurring in the curved portion of the adjacent fluid pipe.

[0017] The invention of claim 5 is the invention of claim 4, the two specific fluid pipes are a small-diameter fluid pipe and a large-diameter fluid pipe having different outer diameters, and the adjacent fluid pipe is the small-diameter fluid pipe; the pipe protection cover comprises a small diameter pipe protection cover and a large diameter pipe protection cover, each of which forms a space for accommodating the small diameter fluid pipe and the large diameter fluid pipe therein, The joint cover has at least two connection ports including a connection port into which the end of the large diameter pipe protection cover can be inserted, One of the at least two connection ports provided on the joint cover is connected to the large diameter pipe protective cover, and the other connection port is connected to the small diameter pipe protective cover via a separate adapter, The adapter has a joint cover side connection portion provided at one end side along the direction of the flow path inserted into the other connection port of the joint cover, and a pipe protection cover side connection portion provided at the other end side along the direction of the flow path fitted externally or internally onto the end of the small diameter pipe protection cover, so that the arrangement space of the flow path inside the adapter and the accommodation space of the small diameter pipe protection cover are internally connected, The intrusion prevention portion is characterized in that it is provided on the adapter.

[0018] According to the invention of claim 5, when two fluid pipes of different outer diameters are connected with a single fitting, the axis of the small-diameter fluid pipe is positioned closer to the installation surface than the axis of the large-diameter fluid pipe while it is housed and held in the pipe protective cover, so the connection portion of the small-diameter fluid pipe with the fitting is slightly curved downward, and the downward curved portion of the small-diameter fluid pipe is arranged in the arrangement space of the adapter body, and the downward curved portion of the small-diameter fluid pipe is installed in the intrusion prevention portion provided on the adapter, so that buckling deformation of the downward curved portion of the small-diameter fluid pipe can be prevented.

[0019] The invention of claim 6 is the invention of claim 5, The joint cover includes a base and a lid body that are assembled together to form the storage space therein, The intrusion prevention portion is characterized in that it is inserted between at least one of the inclined piping portion and the joint and the inner surface of the base.

[0020] According to the invention of claim 6, the intrusion prevention portion provided on the adapter cannot come into contact with the installation surface on which the joint cover and the pipe protection cover are installed.

[0021] The invention of claim 7 is the invention of claim 5, the adapter comprises a fixed body having a fixing portion to be fixed to the installation surface, and a cover body assembled to the fixed body and cooperating with the fixed body to form an accommodation space for accommodating the inclined piping portion of the adjacent fluid pipe therein; The intrusion prevention portion is characterized in that it is provided on the fixed body.

[0022] According to the invention of claim 7, the adapter is provided with a fixed body that is fixed to the installation surface, and the intrusion prevention part is provided on the fixed body, so that the positioning state of the intrusion prevention part is stabilized, and the cover is configured to cover the fixed body that is fixed to the installation surface first, improving workability.

[0023] The invention of claim 8 is any one of the inventions of claims 4 to 7, The abutment surface of the intrusion prevention portion, with which at least one of the inclined piping portion of the adjacent fluid pipe and the fitting abuts, is characterized by being positioned farther from the installation surface than the difference between the axial positions of each fluid pipe held by two pipe protection covers of different sizes.

[0024] According to the invention of claim 8, the adjacent fluid pipe can be smoothly inclined between the joint cover and the pipe protection cover to form an inclined piping section. [Effects of the Invention]

[0025] The present invention relates to a configuration in which one of two fluid pipes connected via a fitting is partially inclined at the portion from the fitting that is housed and protected by a pipe protective cover so that the distance from the installation surface becomes shorter as the portion moves away from the fitting.In this configuration, an adapter is attached to an opening in the fitting cover that houses the fitting, through which the partially inclined fluid pipe is pulled out from the fitting cover, and the protective cover side connection portion is fitted externally or internally into the protective cover.In order to prevent the linear expansion of the fluid pipe due to heat from being concentrated in the inclined piping portion of the fluid pipe, the adapter is provided with an intrusion prevention portion that supports the inclined piping portion from below, thereby effectively preventing buckling deformation of the inclined piping portion due to thermal deformation of the fluid pipe. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 2 is an exploded perspective view of each member constituting the flow path arrangement structure using the adapter A1 of the present invention. [Figure 2] This is an exploded perspective view of a state in which the base V11 of the joint cover C11 is connected in a straight line to the base V11 of the two large-diameter fluid pipe protection covers C1, and a three-way joint D1 that connects two large-diameter fluid pipes P1 and one small-diameter fluid pipe P2 in a T-shape is placed on the base V11. [Figure 3] This is an oblique view showing the state in which the lid body L11 of the joint cover C11 is covering the base V11 of the joint cover C11 on which the three-way joint D1 is arranged and the adapter A1 connected to one end of the small-sized protective cover C2 just before the completion of the piping work of a total of three fluid pipes P1 and P2 with different outer diameters. [Figure 4] FIG. 10 is a perspective view showing a state in which piping work is completed. [Figure 5] 10(a) and 10(b) are perspective views of the base V11 of the joint cover C11 as seen from the front and rear sides, respectively. [Figure 6] 5(a) and (b) are cross-sectional views taken along the lines W1-W1 and W2-W2 in FIG. 5(a), respectively. [Figure 7] 1(a) and 1(b) are perspective views of the adapter A1 as seen from different directions. [Figure 8] 1(a) to 1(e) are a front view, a plan view, a rear view, a bottom view, and a left side view of the adapter A1, respectively. [Figure 9] 8(a) to 8(c) are cross-sectional views taken along lines U1-U1 to U3-U3 in FIG. 8(b), respectively. [Figure 10] 10 is a plan view showing the piping state immediately before the adapter A1 is attached to the base V11 of the joint cover C11. FIG. [Figure 11] 11 is a cross-sectional view taken along line X1-X1 in FIG. 10. [Figure 12] 10 is a plan view showing the piping state after the adapter A1 is attached to the base V11 of the joint cover C11. FIG. [Figure 13] 13 is a cross-sectional view taken along line X2-X2 in FIG. 12. [Figure 14] 13(a) and (b) are cross-sectional views taken along the lines Y1-Y1 and Y2-Y2 in FIG. 12, respectively. [Figure 15] FIG. 13 is a view taken along the arrow Y3 in FIG. [Figure 16] 12. FIG. 13 is a vertical cross-sectional view (corresponding to the cross-sectional view along the line Y2-Y2 in FIG. 12) showing a state in which the lid body L11 is placed over the base V11 of the joint cover C11 and the adapter A1 to complete piping. [Figure 17] 10(a) and 10(b) are perspective views showing the state before and after the adapter A1 is pressed from above onto the base V11 of the joint cover C11 and attached after the small diameter fluid pipe P2 has been installed. [Figure 18] 10(a) and 10(b) are cross-sectional views of the same state, viewed from the upstream side to the downstream side of the fluid flowing through a small-diameter fluid pipe P2. [Figure 19] 10 is a cross-sectional plan view showing a state in which the fitting and locking recess 38 of the adapter A1 is locked to the fitting and locking protrusion 17 of the base V11 of the joint cover C11. FIG. [Figure 20] 10 is a plan view showing the state in which the adapter A1 is being attached to the base V11 of the joint cover C11 by sliding. [Figure 21] FIG. [Figure 22] This is a front view of a piping structure in which an adapter A2 is attached to a joint cover C12 that covers a straight joint D2 that connects to large and small diameter fluid pipes P1' and P2', respectively, to prevent buckling of the small diameter fluid pipe P2'. [Figure 23] FIG. [Figure 24] 10 is an exploded perspective view of a base V12 and a lid L12 that constitute a joint cover C12, and an adapter A2. FIG. [Figure 25] 23 is a cross-sectional view taken along line ZZ in FIG. 22. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in more detail below with reference to several preferred embodiments. [Example]

[0028] First, an outline of the "flow path arrangement structure for fluid pipes" of Example 1 will be described with reference to Figures 1 to 4, and then each member constituting the flow path arrangement structure will be described in detail. The "flow path arrangement structure for fluid pipes" of Example 1 is a structure in which, when two large-diameter fluid pipes P1 are connected in a straight line using a three-way joint (tee joint) D1 and one small-diameter fluid pipe P2 is branched at right angles to the two fluid pipes P1, an adapter A1 prevents buckling due to concentration of linear expansion caused by heat in an inclined piping portion P2a generated in the portion of the small-diameter fluid pipe P2 connected to the three-way joint D1, and a joint cover C that is T-shaped in a plan view and that houses the three-way joint D1 inside. 11 The three-way joint D1 is characterized by a structure in which it is attached to a straight joint portion 1. The three-way joint D1 is made up of a straight joint portion 1 that connects two large-diameter fluid pipes P1 in a straight line, and a branch joint portion 2 that is perpendicular to the straight joint portion 1 and has its axis positioned at the same height as the axis of the straight joint portion 1 as shown in Figure 13, and that connects the small-diameter fluid pipe P2.

[0029] Two large-diameter fluid pipes P1 connected in a straight line via the straight joint portion 1 of the three-way joint D1 are housed and held in respective pipe protection covers C1, and a small-diameter fluid pipe P2 that branches off perpendicularly to the two large-diameter fluid pipes P1 is housed and held in a pipe protection cover C2. Each pipe protection cover C1 that houses and holds the two large-diameter fluid pipes P1 comprises a base V1 fixed to the installation surface F, and a cover L1 that is assembled integrally with the base V1 to form an internal storage space in cooperation with the base V1. The joint cover C, which is T-shaped in plan view, 11 is the base V fixed to the installation surface F 11 and the base V 11 By assembling it integrally with the base V 11 A cover L which cooperates with the cover L to form an accommodation space for the three-way joint D1 therein. 11 The bases V1 of the pipe protection covers C1 of the two large-diameter fluid pipes P1 are connected to the joint covers C. 11 Base V 11 The joint cover C is connected in a straight line to each of the straight connection portions 11. 11 The base V 11 and lid body L 11 Both of these are T-shaped in plan view.

[0030] The small diameter fluid pipe P2 is housed and held in another pipe protection cover C2 that is smaller than the pipe protection cover C1, and the pipe protection cover C2 is made up of a base V2 that is fixed to the installation surface F and a lid body L2 that is assembled integrally with the base V2 and forms a housing space for the small diameter fluid pipe P2 in cooperation with the base V2. The small diameter fluid pipe P2 is connected to the branch joint portion 2 of the three-way joint D1, and thereby a total of three fluid pipes P1, P2, consisting of two large diameter fluid pipes P1 and one small diameter fluid pipe P2, are connected to each other via the three-way joint D1, with the small diameter fluid pipe P2 forming a branch piping configuration. As shown in Figure 13, the heights H1, H2 from the installation surface F of the respective axes K1, K2 of the large-diameter and small-diameter fluid pipes P1, P2 are different (H1>H2), so when one end of the small-diameter fluid pipe P2 is connected to the branch joint portion 2 of the three-way joint D1, a predetermined length of the small-diameter fluid pipe P2 calculated from the branch joint portion 2 becomes an inclined piping portion P2a (see Figure 13) that is piped in an inclined state with respect to the installation surface F, and most of the inclined piping portion P2a is not contained in the pipe protective cover C2 and is in an aerial piping state. Therefore, the base V2 of the pipe protective cover C2 of the small-diameter fluid pipe P2 is connected to the joint cover C 11 Base V 11 The adapter A1 is not directly connected to the branch connection portion 12 of the adapter A1, but is fixed to the installation surface F at an interval corresponding to the length of the adapter A1 in the flow path direction. As shown in Figure 13, the bases V1 and V2 of the pipe protection covers C1 and C2 are configured such that a pair of holding pieces 82 (84) for holding the fluid pipe P1 (P2) are integrally provided on the upper surface of a base plate portion 81 (83) fixed to the installation surface F.

[0031] Joint cover C 11 Lid L 11 The adapter A1 is made up of a straight portion 3 and a branch portion 4 which is provided integrally with the straight portion 3 and perpendicular to the longitudinal center of the straight portion 3. The adapter A1 has a split opening 35 which is open on the entire surface of the side facing the installation surface F, and a fitting and locking recess 38 provided on the upstream side in the flow path direction is connected to the joint cover C. 11 Base V 11 In a state where the branch connection portion 12 is fitted and locked to the fitting and locked protrusion 17, the upstream end in the flow path direction is 11 Lid L 11The branch portion 4 is fitted onto the outside of the joint cover C2, and its downstream end is fitted onto the end of a pipe protection cover C2 that houses and holds a small diameter fluid pipe P2 inside. 11 In order to absorb the size difference between the three-way joint D1 and the pipe protective cover C2, the split opening 35 is maintained in a planar shape, and the perimeter is gradually shortened from the upstream side to the downstream side of the flow path while maintaining the approximate similarity of the cross section. 11 The fluid pipes P1, P2, the pipe protection covers C1, C2 and the adapter A1 are all made of resin.

[0032] Next, referring to FIGS. 1 to 6, particularly FIGS. 5 and 6, the joint cover C 11 The base V that constitutes 11 and lid body L 11 The T-shaped base V 11 A pair of linear connection parts 11 and one branch connection part 12 provided in the above-mentioned connection part 11 have the same shape including dimensions, and each of the three connection parts 11, 12 has a thick-walled part 14 formed to be thick by a predetermined length along the flow path direction relative to the base plate part 13 over the entire width, and at both ends in the width direction of each connection part 11, 12, a standing wall part 15 including the thick-walled part 14 is formed along the flow path direction, and on the outside of each standing wall part 15, a lid body L is provided. 11 The inner surface of each upright wall portion 15 is formed with a portion that stands up and is connected to the thick portion 14 and is thicker than the other portions, thereby forming a mating mating protrusion 17 into which the mating mating recess 38 of the adapter A1 is mated and locked. The inclined inner surface 17a of the mating mating protrusion 17 is inclined at an obtuse angle with the upper surface of the thick portion 14 to ensure a secure fit with the mating mating recess 38 of the adapter A1 (see FIG. 6). In the center of the width direction of the upper surface of the base plate portion 13, recessed stripes 18a and 18b are formed perpendicularly along the linear connection direction and the branching direction, respectively, which indicate the center of the width direction of the base plate portion 13. At the portions where the recessed stripes 18a and 18b intersect with the thick portion 14 at the ends thereof and the portions where the recessed stripes 18a and 18b intersect, a total of four portions are provided.11 The joint cover C has screw insertion holes 19 through which screws 91 are inserted to fix the joint cover C to the installation surface F. 11 The base V that constitutes 11 and lid body L 11 When the joint cover C is assembled, 11 The portion where the large diameter fluid pipe P1 is drawn out from the internal accommodation space and the portion where the small diameter fluid pipe P2 is drawn out and the adapter A1 is attached are both through holes 20 (see FIG. 4). 16b denotes an assembly locking portion provided between two other assembly locking portions 16a formed along the linear connection direction of the base plate portion 13, and 21 denotes a joint cover C. 11 Base V 11 10 shows a pair of positioning pieces for positioning in the width direction when connecting the bases V1 and V2 of the tube protection covers C1 and C2 to the tube protection covers C1 and C2.

[0033] Joint cover C 11 Base V 11 A three-way joint D1 to which two large-diameter fluid pipes P1 and one small-diameter fluid pipe P2 are connected is disposed on the base V. 11 With the adapter A1 attached to the branch connection portion 12 of the base V 11 Lid L that can be assembled to 11 As shown in FIGS. 1, 3 and 4, the base V 11 The base V has a T-shape corresponding to the straight portion 3 and the branch portion 4. 11 The cover L cooperates with the cover L to form an accommodation space for the three-way joint D1 inside. 11 The inner surfaces of the side walls of the straight portion 3 and the branch portion 4 are 11 The base V has an assembly locking portion 22a corresponding to the assembly locking portions 16a and 16b. 11 An assembly locking portion corresponding to the assembly locked portion 16b is not shown.

[0034] Adapter A1 is compatible with coupling cover C. 11 Base V 11 In a state where the joint cover C is attached to the branch connection portion 12 of the 11and the pipe protection cover C2 that houses and holds the small-diameter fluid pipe P2, and covers and protects the inclined pipe portion P2a of the fluid pipe P2 that is piped in that portion, and is equipped with a pair of intrusion prevention portions 32 that prevent the linear expansion of the fluid pipe P2 due to heat from concentrating on the inclined pipe portion P2a and causing buckling. 11 Lid L 11 The branch portion 4 of the adapter body 31 is fitted onto the outside of the joint cover C2, and the protective cover side connecting portion 42 is fitted onto the outside of the end of the pipe protective cover C2 which accommodates and holds the small diameter fluid pipe P2 inside. 11 and the pipe protective cover C2, the adapter A1 has a tapered shape in which the perimeter gradually decreases from the upstream side to the downstream side of the flow path while maintaining the approximate similarity of the cross section, while maintaining the flatness of the split opening 35. Also, as shown in Figures 3 and 7 to 9, the adapter A1 comprises an adapter main body 31 and a pair of intrusion prevention parts 32 provided at the upstream end of the flow path of the small-diameter fluid pipe P2 in the adapter main body 31 so as to protrude upstream. The adapter body 31 has side walls 34 extending from both widthwise ends of the top wall 33 arranged opposite the installation surface F toward the installation surface F, and a split 35 that allows a small-diameter fluid pipe P2 to pass between the tips of the side walls 34. Therefore, the cross section of the adapter body 31 is U-shaped in all parts along the flow path direction, and as the side walls 34 flex and deform, the width of the split 35 changes, changing the spacing between the pair of entry prevention portions 32 along the width direction of the split 35. At the upstream end of the adapter body 31 in the flow path direction, a U-shaped cross-sectionally fitted portion 36 is provided, which is attached to the joint cover C relative to other parts. 11 Lid L 11The pair of intrusion prevention sections 32 are integrally provided in a cantilevered manner via support arms 37 at the upstream tip (free end) of each side wall section 34, so that the pair of intrusion prevention sections 32 are arranged at a predetermined distance in the center of the adapter body 31 in the width direction, protruding toward the upstream side of the adapter body 31. The space surrounded by the top wall section 33 and the pair of side walls 34 of the adapter body 31 and opened downward by the split opening 35 serves as a flow path arrangement space 41 in which an inclined piping section P2a of the small-diameter fluid pipe P2 is arranged, forming an inclined flow path.

[0035] The pair of intrusion prevention portions 32 have a predetermined length along the direction of the flow path of the small-diameter fluid pipe P2 housed and held in the pipe protection cover C2, which is fitted over the downstream end of the adapter body 31, and are provided parallel to the split opening 35 of the adapter body 31. Therefore, the pair of intrusion prevention portions 32 are arranged at an incline relative to the flow path of the inclined pipe portion P2a housed in the installation space inside the adapter body 31. The upper surfaces of the pair of intrusion prevention portions 32 form pipe support surfaces 32a that support the inclined pipe portion P2a of the small-diameter fluid pipe P2, and the pipe support surfaces 32a are formed in an arc-shaped surface that corresponds to the outer diameter of the circle that is the cross section of the small-diameter fluid pipe P2. For this reason, when the adapter A1 is attached to the joint cover C 11 Base V 11 When the adapter A1 is attached to the fitting cover C, the height of each of the pipe support surfaces 32a on the upper surface of the pair of intrusion prevention portions 32 gradually increases from the installation surface F from the center of the adapter body 31 in the width direction toward both ends. Due to this shape, when the inclined piping portion P2a of the small-diameter fluid pipe P2 supported by the pipe support surfaces 32a tries to move sideways due to linear expansion, the lateral pressing force against the pipe support surfaces 32a is induced by the fitting engagement recess 38 of the adapter A1, which will be described later, and the joint cover C. 11 Base V 11 This has the effect of ensuring the engagement with the fitting engagement projection 17.

[0036] As shown in FIG. 8, the pair of intrusion prevention parts 32 are integrally provided on the inner side of a pair of support arms 37 that protrude upstream from the upstream end of the flow path of the adapter body 31, and a joint cover C is provided on the outer side of the pair of support arms 37. 11 Base V 11 The fitting and locking recesses 38 are formed in a rectangular concave shape in a plan view, into which the fitting and locking projections 17, which are rectangular convex in a plan view, are fitted, and the inclined inner surfaces 38a of the fitting and locking recesses 38 along the flow path direction are inclined corresponding to the inclined inner surfaces 17a of the fitting and locking projections 17. Also, the corners of the pair of support arms 37 located on the upstream side of the fitting and locking recesses 38 slide in the opposite direction to the flow path of the adapter A1, and the fitting and locking recesses 38 are formed in a rectangular concave shape in a plan view, and the inclined inner surfaces 38a of the fitting and locking recesses 38 along the flow path direction of the adapter A1 are inclined corresponding to the inclined inner surfaces 17a of the fitting and locking projections 17. 11 Base V 11 In order to allow the fitting-engagement recess 38 of the fitting-engagement protrusion 17 to fit into the fitting-engagement recess 38 of the fitting-engagement protrusion 17, the fitting-engagement protrusion 17 has an inclined guide surface 39 that is inclined in plan view so that its width gradually increases along the direction of the flow path.

[0037] Next, referring mainly to Figures 1 to 4 and Figures 10 to 16, a piping method will be described in which the adapter A1 is used to prevent buckling caused by the concentration of thermal linear expansion of the fluid pipe P2 at the inclined piping portion P2a of the small-diameter fluid pipe P2 branched at the connection portion of two large-diameter fluid pipes P1 using a three-way joint D1. First, as shown in Figures 1 and 2, the base V of the three-way joint D1 is attached to the installation surface F. 11 is fixed via a plurality of screws 91, and the base V 11 The base V1 of the pipe protection cover C1 is directly connected and fixed to each of the linear connection portions 11 of the pipe protection cover C1. 11 10 and 11, the base V2 of the pipe protection cover C2 is indirectly connected and fixed to the branch joint portion 12 at a predetermined interval. In this state, as shown in Fig. 10 and Fig. 11, the three-way joint D1, in which the large-diameter fluid pipe P1 is connected to each straight joint portion 1 and the small-diameter fluid pipe P2 is connected to the branch joint portion 2, is fixed to the base V2 of the three-way joint D1. 11The pipe protective covers C1, C2 are installed on the installation surface F, and three large-diameter and small-diameter fluid pipes P1, P2 are held by the holding pieces 82, 84 of the corresponding bases V1, V2, respectively. After that, covers L1, L2 are placed on the bases V1, V2. The heights H1, H2 of the axes K1, K2 of the large-diameter and small-diameter fluid pipes P1, P2 held by the pair of holding pieces 82, 84 of the bases V1, V2 of the pipe protective covers C1, C2 from the installation surface F are different (H1>H2). As a result, the portion of the small-diameter fluid pipe P2 connected to the branch joint portion 2 of the three-way joint D1 forms an inclined pipe portion P2a that is slightly curved downward by a predetermined length with respect to the installation surface F. The side of the inclined pipe portion P2a connected to the three-way joint D1 is covered with a joint cover C. 11 The inclined piping section P2a is accommodated in an aerial state within the accommodation space of the adapter A1, and the side of the inclined piping section P2a connected to the pipe protective cover C2 is arranged in the air in the flow path arrangement space 41 of the adapter A1. The thermal linear expansion of the small-diameter fluid pipe P2 is concentrated in the inclined piping section P2a, and the inclined piping section P2a is likely to undergo buckling deformation that tends to bend the inclined piping section P2a further downward.

[0038] Next, joint cover C 11 Base V 11 17 to 19, in order to attach the adapter A1 to the branch connection portion 12 of the adapter A1, the pair of intrusion prevention portions 32 of the adapter A1 are oriented toward the upstream side of the flow path, and the pair of side wall portions 34 of the adapter body 31 of the adapter A1 are flexibly deformed outward to widen the width of the split opening 35, and the inclined piping portion P2a of the small-diameter fluid pipe P2 is relatively passed between the pair of intrusion prevention portions 32, and the adapter body 31 is pressed strongly downward, and as shown in FIGS. 3, 12, and 13, the base V of the three-way joint D1 is engaged with each of the fitting and locking recesses 38 arranged on the outside of the pair of intrusion prevention portions 32 of the adapter A1. 11 The fitting-retaining projections 17 of the branch connection portion 12 are inserted and fitted in. This prevents the pair of side walls 34 of the adapter body 31 arranged opposite to each other from deforming outward, i.e., prevents the split opening 35 of the adapter body 31 from deforming so as to widen, and also prevents the base V of the three-way joint D1 from deforming. 11This also prevents the adapter A1 from moving in the direction of the flow path of the small-diameter fluid pipe P2. Because the adapter A1 has a split opening 35 at its bottom, after the small-diameter fluid pipe P2 has been installed, the adapter A1 can be pushed in from above the fluid pipe P2, allowing the installed fluid pipe P2 to be inserted from the split opening 35 of the adapter A1 into the internal flow path installation space 41, making it possible to install the adapter A1 later.

[0039] In addition, joint cover C 11 Base V 11 After the adapter A1 is attached to the branch connection portion 12 as described above, it is also possible to attach a small diameter fluid pipe P2 to the branch joint portion 2 of the three-way joint D1. 11 Base V 11 To attach the adapter A1 to the branch connection portion 12, as shown in Figures 20 and 21, the adapter A1 is bent so that the split opening 35 becomes slightly narrower, and then the adapter A1 is attached to the base V. 11 The adapter A1 is slid from the front side relative to the branch connection portion 12, with the abutment portion 39a, which is the widest portion at the rear end of the inclined guide surface 39 at the tip of each support arm 37 of the adapter A1, in contact with the inclined inner surface 17a of each mating-engagement-target protrusion 17 provided opposite to each other in the width direction of the branch connection portion 12, and when the adapter A1 passes each mating-engagement-target protrusion 17, the deflection disappears and the adapter A1 returns to its original shape, and the mating-engagement-target protrusion 17 of the branch connection portion 12 is inserted and mated into each mating-engagement-target recess 38 of the adapter A1, 11 An adapter A1 is attached to the

[0040] As described above, the base V of the three-way joint D1 1114 and 17(b), when the adapter A1 is attached to the adapter A1, the pair of intrusion prevention members 32 of the adapter A1 are arranged such that the inclined piping section P2a of the small-diameter fluid pipe P2 is positioned at the pair of intrusion prevention members 32 of the adapter A1, and the downstream portion of the flow path of the adapter A1 is fitted over the cover L2 of the installed pipe protective cover C2. Here, the pair of intrusion prevention members 32 of the adapter A1 are formed parallel to their own split opening 35, and the inclined piping section P2a of the small-diameter fluid pipe P2 arranged above the pair of intrusion prevention members 32 is slightly inclined with respect to the installation surface F, i.e., the split opening 35 of the adapter A1. Therefore, of the portion of the inclined piping section P2a arranged above the pair of intrusion prevention members 32, only the lowest downstream portion of the flow path of the portion arranged above the pair of intrusion prevention members 32 is in contact with the pipe support surface 32a- of the pair of intrusion prevention members 32, and the remaining portion is in close proximity to the pipe support surface 32a-.

[0041] Finally, fitting cover C 11 Base V 11 For the lid body L 11 When the cover is closed, the cover L 11 Both ends of the straight portion 3 are fitted onto the ends of the lid bodies L1 of the pipe protection covers C1 of the large-diameter fluid pipes P1 that have already been installed, and the ends of the branched portions 4 are fitted onto the fitted portions 36 of the adapters A1 that have already been installed, thereby completing the piping work.

[0042] When each of the fluid pipes P1 and P2 is a hot water supply pipe, the linear expansion due to heat is concentrated in one of the portions of each of the fluid pipes P1 and P2 (usually, the joint connection portion or the faucet connection portion at both ends of the pipe where the expansion resistance is greatest). In the first embodiment, as shown in Figs. 14 and 16, the inclined piping portion P2a of the fluid pipe P2 is covered with the joint cover C. 11 The inclined piping portion P2a is disposed between the accommodation space of the adapter A1, the flow path arrangement space 41 of the adapter A1, and the end of the pipe protection cover C2. 11Within the accommodation space, the fluid pipe P2 is supported by the pipe support surfaces 32a on the upper surfaces of the pair of intrusion prevention parts 32 of the adapter A1. For this reason, with respect to the small-diameter fluid pipe P2, thermal linear expansion tends to concentrate at the inclined pipe section P2a, which is the fixed end of the fluid pipe P2 and is slightly bent downward, but this section is supported with the necessary support strength by the pair of intrusion prevention parts 32 of the adapter A1, so that the expansion resistance is too great for the inclined pipe section P2a to thermally expand and deform in a direction approaching the installation surface F and enter between the pair of intrusion prevention parts 32. Therefore, this intrusion is effectively prevented, and the thermal linear expansion of the fluid pipe P2 is absorbed without being concentrated in one specific location by being bent at a large radius of curvature in other parts, for example, in a long-span section of the fluid pipe P2 accommodated and held in the pipe protective cover C2. As a result, the linear expansion is concentrated in the inclined pipe portion P2a of the fluid pipe P2, and it is possible to prevent the downward curvature of the inclined pipe portion P2a from becoming larger or from progressing further to cause buckling.

[0043] Furthermore, when the pair of insertion prevention portions 32 of the adapter A1 are pressed downward by the inclined piping portion P2a of the fluid pipe P2 due to linear expansion caused by heat, this pressing force is applied to the fitting and locking recesses 38 provided in the adapter A1 itself and the joint cover C. 11 Base V 11 When the inclined piping portion P2a is thermally deformed laterally, the pipe support surface 32a having an arcuate cross section of one of the pair of intrusion prevention portions 32 is pressed laterally, and this pressing force acts to further strengthen the fit between one of the pair of inclined piping portions 17 and one of the pair of inclined piping recesses 38. Therefore, no matter in what direction the inclined piping portion P2a of the fluid pipe P2 is thermally deformed or attempts to be thermally deformed, the force always acts to further strengthen the fit. Therefore, when the inclined piping portion P2a of the fluid pipe P2 is thermally deformed, the joint cover C can be easily disassembled. 11 Base V 11 The attachment of the adapter A1 to the adapter A1 does not loosen or come loose.

[0044] 13 and 14, it is desirable that the height H0 of the contact portion between the pair of intrusion prevention portions 32 of the adapter A1 and the inclined piping portion P2a of the fluid pipe P2 relative to the installation surface F is greater than the difference (H1-H2) in height positions relative to the installation surface F of the respective axial centers K1, K2 of the large-diameter and small-diameter fluid pipes P1, P2 housed and held in each pipe protection cover C1, C2 [H0>(H1-H2)].

[0045] Furthermore, although the adapter A1 is a single unit with a split opening 35, the adapter may also be configured with a base that is fixed to the installation surface and a cover that covers the base, and a pair of entry prevention parts may be provided on the base.

[0046] In addition, in Example 1, the pair of intrusion prevention portions 32 of the adapter A1 support the inclined piping portion P2a of the small diameter fluid pipe P2, but they may also support the branch joint portion 2 of the three-way joint D1, or may support both the inclined piping portion P2a and the branch joint portion 2.

[0047] In terms of terminology, the inclined piping section P2a of the fluid pipe P2 "enters" between a pair of intrusion prevention sections 32 of the adapter A1 due to the concentration of thermal linear expansion, which is synonymous with the inclined piping section P2a "moving excessively close" to the installation surface F. [Example]

[0048] Next, a "flow path arrangement structure for fluid pipes" according to a second embodiment of the present invention will be briefly described with reference to Figures 22 to 25. In the second embodiment, the present invention is applied to the "pipe joint housing protective cover" disclosed in Patent Document 1. A straight joint D2 connecting a large-diameter fluid pipe P1' and a small-diameter fluid pipe P2' is provided with a joint cover C. 12 Base V 12Since movement in the flow path direction is restricted by a pair of regulating bodies R1, R2 detachably fixed to the linear joint D2, the concentration of thermal linear expansion of each fluid pipe P1', P2' is blocked at the regulating bodies R1, R2. However, since the small diameter fluid pipe P2' is connected to the straight joint D2 with a slight downward curve, the thermal linear expansion is concentrated in the curved lower part of the small diameter fluid pipe P2', which makes it prone to buckling deformation.

[0049] Therefore, the adapter A2 having a pair of intrusion prevention parts 51 for supporting the downwardly curved part of the small diameter fluid pipe P2' is attached to the joint cover C. 12 Base V 12 and the pipe protection cover C2' of the small-diameter fluid pipe P2', thereby preventing buckling of the small-diameter fluid pipe P2' due to thermal expansion deformation. The adapter A2 has a pair of side walls 53 extending from both widthwise ends of the top wall 52 toward the installation surface, and a pair of assembly locking portions 55 provided on the inner surface of each side wall 53 at a portion facing the split opening 54 are secured to the joint cover C2'. 12 Base V 12 The joint cover C is engaged with the respective assembly engaging portions 56 provided on the side end surfaces of the joint cover C. 21 Base V 12 The fitting portion 57 on the upstream side in the flow path direction is provided with a joint cover C. 12 is fitted onto the outside of the pipe, and the downstream side in the flow path direction is fitted onto the outside of the pipe protection cover C2'. [Explanation of symbols]

[0050] A1, A2: Adapter C1: Pipe protection cover (large diameter fluid pipe) C2: Pipe protection cover (small diameter fluid pipe) C 11 : Joint cover (3-way joint) C 12 : Joint cover (straight joint) D1: 3-way joint D2: Straight joint L1, L2: Tube protection cover lid L 11 Three-way joint lid L 12 :Straight joint cover P1: Large diameter fluid pipe (large diameter) P2: Small diameter fluid pipe (small diameter) P2a: Inclined piping section of small diameter fluid pipe V1, V2: Pipe protection cover base V 11 :Three-way joint base V 12 : Straight joint base 17: Fitted and locked convex portion of the base of the joint cover 20: Joint cover hole 31: Adapter body 32, 51: Anti-entrapment section 32a: Pipe support surface 35,54: Adapter split 36: Outer fitting part of adapter (connection part on joint cover side) 38: Adapter fitting and locking recess 41: Adapter flow path arrangement space 42: Adapter pipe protection cover side connection part

Claims

1. An adapter is attached to a port through which the fluid pipe is drawn out to the outside in a joint cover which is connected to a fluid pipe that is arranged in a straight line along an installation surface and has an accommodation space formed therein for accommodating a joint that forms a flow path together with the fluid pipe, a joint cover side connecting portion that is inserted into the passage hole is provided at one end side of the adapter body, and a pipe protection cover side connecting portion that is fitted externally or internally to an end of a pipe protection cover that has an internal storage space for the fluid pipe drawn out from the joint cover to the outside is provided at the other end side, and an arrangement space for the flow path is formed inside the adapter body, continuing from the one end side to the other end side; the fluid passage arrangement space has an inclined piping section inclined so that the axis of the fluid pipe arranged in the arrangement space gradually approaches the installation surface from the joint toward the pipe protective cover, An adapter characterized in that the adapter body is provided with an intrusion prevention section that is arranged on the installation surface side of the inclined piping section in at least one of the fitting cover in the adapter body and the arrangement space of the flow path, with a predetermined gap from the installation surface, and that abuts against at least one of the fluid pipe and the fitting that attempts to intrude into the gap due to linear expansion of the fluid pipe due to heat, thereby preventing the fluid pipe and the fitting from intruding into the gap.

2. a split opening that allows the entire fluid pipe to pass through is formed over the entire length of the flow path of the adapter body in a portion of the adapter body facing the installation surface, and the adapter body is entirely flexible and deformable in a direction in which the width of the split opening changes; The adapter according to claim 1, characterized in that a pair of the intrusion prevention portions are formed on the side of the adapter body connected to the joint cover, perpendicular to the flow path and spaced a predetermined distance apart in the width direction of the split opening.

3. a locking portion that is locked to a locked portion formed on the joint cover is formed on the joint cover side connection portion of the adapter body, the locking portion is movable between an unlocked position spaced apart from the inner surface of the joint cover and an locked position in proximity to the inner surface of the joint cover due to a flexural deformation of the entire adapter body, The adapter according to claim 2, wherein the fluid pipe arrangement surfaces of the pair of intrusion prevention portions are formed in an arcuate shape that moves away from the installation surface as the engaging portion moves from the non-engaging position to the engaging position.

4. A plurality of fluid pipes arranged along the installation surface are connected by a single joint to form a continuous flow path; At least two of the plurality of fluid pipes are housed and piped in respective pipe protection covers that form housing spaces therein, and are held by a holding part that maintains a state in which the axial positions of the fluid pipes are determined with respect to the installation surface, The joint to which the plurality of fluid pipes are connected is accommodated in an accommodation space inside the joint cover, two specific fluid pipes among the plurality of fluid pipes have different distances between the axis centers of the fluid pipes and the installation surface when held by the holding portions of the protective covers, Of the two specific fluid pipes, the adjacent fluid pipe whose axis is held at a position relatively close to the installation surface has an inclined piping section formed between the joint and a holding section of a pipe protection cover that holds the adjacent fluid pipe, the inclined piping section being inclined so as to gradually approach the installation surface, A fluid pipe flow path arrangement structure characterized in that a gap formed between the installation surface and at least one of the inclined piping section and the joint is provided with an intrusion prevention section that abuts against at least one of the adjacent fluid pipes and the joint that attempts to intrude into the gap due to thermal linear expansion of at least one of the two specific fluid pipes, thereby preventing the intrusion of the adjacent fluid pipe and the joint.

5. the two specific fluid pipes are a small-diameter fluid pipe and a large-diameter fluid pipe having different outer diameters, and the adjacent fluid pipe is the small-diameter fluid pipe; The pipe protection cover comprises a small diameter pipe protection cover and a large diameter pipe protection cover, each of which forms a space for accommodating the small diameter fluid pipe and the large diameter fluid pipe therein, The joint cover has at least two connection ports including a connection port into which an end of the large diameter pipe protective cover can be inserted, One of the at least two connection ports provided on the joint cover is connected to the large diameter pipe protective cover, and the other connection port is connected to the small diameter pipe protective cover via a separate adapter, The adapter has a joint cover side connection portion provided at one end side along the direction of the flow path inserted into the other connection port of the joint cover, and a pipe protection cover side connection portion provided at the other end side along the direction of the flow path fitted externally or internally onto the end of the small diameter pipe protection cover, so that the arrangement space of the flow path inside the adapter and the accommodation space of the small diameter pipe protection cover are internally connected, 5. The fluid pipe flow path arrangement structure according to claim 4, wherein the intrusion prevention portion is provided on the adapter.

6. The joint cover includes a base and a lid body that are assembled together to form the storage space therein, 6. The fluid pipe flow path arrangement structure according to claim 5, wherein the intrusion prevention portion is inserted between at least one of the inclined piping portion and the joint and the inner surface of the base.

7. the adapter comprises a fixed body having a fixing portion to be fixed to the installation surface, and a cover body assembled to the fixed body and cooperating with the fixed body to form an accommodation space for accommodating the inclined piping portion of the adjacent fluid pipe therein; 6. The fluid pipe flow path arrangement structure according to claim 5, wherein the intrusion prevention portion is provided on the fixed body.

8. A fluid pipe flow path arrangement structure as described in any one of claims 4 to 7, characterized in that the abutment surface of the intrusion prevention portion, which abuts at least one of the inclined piping portion of the adjacent fluid pipe and the fitting, is positioned at a position farther from the installation surface than the difference between the axial positions of each fluid pipe held by two pipe protection covers of different sizes.

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