JP4517084B2 - Piping cover - Google Patents

Description

  The present invention relates to a pipe cover for covering a pipe such as a refrigerant pipe extended between an outdoor unit and an indoor unit of a home air conditioner, for example.

  Generally, when installing a home air conditioner in a residential house, etc., an outdoor unit is arranged outside the wall part of the house, an indoor unit is attached inside the wall part, and the space between the outdoor unit and the indoor unit is set. They are connected by a flexible refrigerant pipe. The refrigerant pipe is inserted into a through-hole formed in the wall portion of the house and is extended along the wall surface of the wall portion. In addition, a drain pipe or a ventilation pipe extending from the indoor unit is led along the refrigerant pipe, inserted into the through-hole together with the refrigerant pipe, and led out to the outside.

In this case, as disclosed in Patent Document 1, a pipe cover is attached to the wall surface of the wall portion in order to protect the pipes such as the refrigerant pipe and the drain pipe, or to improve the view of the house and the scenery, The pipe cover covers an extended part along the wall surface of each pipe, a through hole in the wall part, and an insertion part of each pipe with respect to the through hole.
JP 2000-337554 A

  However, there are cases where a synthetic resin or stainless steel sleeve having a flange portion is attached to both ends of the through hole of the wall portion through which the pipe is inserted, and there are cases where the sleeve is not attached. That is, in newly built houses, through holes are formed in appropriate locations on the wall in advance so that it can be immediately adapted to the installation of the air conditioner, and lids for closing the through holes are provided at both ends of the through holes. A sleeve for removably attaching is attached. And when installing an air conditioner, the said cover body is removed and each piping is passed through a through-hole. Also, when installing a home air conditioner in an existing house, a through hole may be formed at an appropriate location on the wall during installation, and a sleeve and a cover of the sleeve may be attached to the through hole. In some cases, an air conditioner is installed without attaching a sleeve or the like.

  For this reason, when a sleeve is attached to the through hole, when the piping cover is attached to the wall surface of the house wall, the opening peripheral edge of the end of the piping cover interferes with the flange portion of the sleeve, and the piping cover There is a problem that a gap is formed between the wall surface and the wall surface, the pipe cover cannot be firmly fixed to the wall surface in a joined state, and the appearance is inferior.

  In order to cope with such a problem, for example, it is conceivable to form a notch in the opening peripheral edge of the end portion of the pipe cover so as to avoid interference between the end portion of the pipe cover and the flange portion of the sleeve. However, with this configuration, when the sleeve is not attached to the through-hole of the wall portion, the cutout portion may be in an open state, and dust or rainwater may enter the pipe cover from the open portion. Yes, the function as a piping cover is reduced.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to cover the wall surface of the wall part with the through hole and the pipe insertion part for the through hole, regardless of whether the sleeve is attached to the through hole in the wall part or not. It is an object of the present invention to provide a piping cover that can be securely attached without causing a gap or the like.

In order to achieve the above object, the invention according to claim 1 is a pipe cover provided with a cover part for covering the through hole of the wall part and the pipe inserted through the through hole, wherein the cover part includes: An end cover for covering a through hole and a portion inserted through the through hole of the pipe is provided. The end cover includes an end cover main body and an end cover main body for attaching the end cover main body to the outer wall surface. and a end fitting portion, the opening portion of the wall surface of the end cover portion body, with lack the formed stepped cutting to avoid interference with the flange portion of the sleeve which is mounted in the through hole, the A U-shaped adapter that is detachably attached to the stepped notch is provided , and the adapter and the end attaching portion are configured to be engageable by an uneven relationship .

The invention according to claim 2 extends along the wall surface and covers an extended portion along the wall surface of the pipe so as to cover the pipe inserted through the through hole of the wall portion forming the wall surface. And an end cover for covering a through hole and a portion inserted through the through hole of the pipe. The end cover includes an end cover main body and the end cover. An end attaching portion for attaching the cover portion main body to the outer wall surface, and avoiding interference with the flange portion of the sleeve attached to the through hole in the opening portion on the wall surface side of the end cover portion main body. And a U-shaped adapter that is detachably attached to the stepped notch , and the adapter and the end mounting portion are configured to be engageable by an uneven relationship. It is characterized by being.
According to a third aspect of the present invention, in the piping cover according to the first or second aspect, a locking ring is provided on an inner surface of the end cover main body, and the locking portion is provided on the end mounting portion. An engagement claw that engages with the ring is provided.
According to a fourth aspect of the present invention, in the piping cover according to any one of the first to third aspects, a planar arc-shaped raised portion is provided at the bottom of the end portion attaching portion, and both ends of the raised portion are provided. A step portion is provided in the portion, and when the end portion attachment portion and the adapter are engaged, both ends of the adapter are sandwiched between the lower surface of the raised portion and the upper surface of the step portion. It is characterized by.

(Function)
In the first and second aspects of the invention, when the sleeve is mounted in the through hole of the wall portion, the cover portion is removed from the stepped cutout of the cover portion, and the cover portion is removed from the wall surface of the wall portion. To cover the pipe. As a result, the stepped notch of the cover portion is arranged corresponding to the flange portion of the sleeve, and interference between the end portion of the cover portion and the flange portion of the sleeve is avoided, and the gap due to the stepped notch is caused by this flange. Closed. Therefore, no gap is formed between the cover portion and the wall surface of the wall portion, and the cover portion can be firmly fixed to the wall surface in a joined state.

  On the other hand, when the sleeve is not attached to the through-hole of the wall portion, with the adapter disposed in the stepped notch of the cover portion, the cover portion is attached to the wall surface of the wall portion, and the piping is Cover. Thereby, the stepped notch of the cover part is closed by the adapter, and the cover part can be fixed to the wall surface in a closed state without forming an open portion between the end part of the cover part and the wall surface. . Therefore, it is possible to prevent the possibility of dust, rainwater, or the like entering the inside from the open portion of the stepped notch of the cover portion.

  As described above, according to the present invention, the through hole and the pipe for the through hole are formed on the wall surface of the wall portion, regardless of whether the sleeve is attached to the through hole of the wall portion or not. The pipe cover can be securely attached to the wall surface without any gap in a state where the insertion portion is covered with the pipe cover.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1, 2, 3, and 7, a through hole 12 is formed in a wall portion 11 of a house or the like for installing a home air conditioner. A pipe 13 such as a refrigerant pipe is inserted into the through hole 12, and the outer end of the refrigerant pipe 13 is extended along the outer wall surface 11 a of the wall portion 11 to be connected to the outdoor unit of the air conditioner. The end is connected to the indoor unit of the air conditioner. The piping cover 14 of this embodiment is attached to the outer wall surface 11a of the wall portion 11, and the piping cover 14 extends the extending portion 13a along the outer wall surface 11a of the piping 13, the through hole 12 of the wall portion 11, and the penetration thereof. The insertion portion 13b of the pipe 13 with respect to the hole 12 is covered. In FIGS. 3 and 7, for ease of understanding, the pipe 13 is drawn as one thick pipe, but in practice, the supply side refrigerant pipe, the return side refrigerant pipe, and the drain pipe are drawn. A plurality of pipes exist.

  As shown in FIG. 7, generally, when the through hole 12 of the wall portion 11 is formed at the time of new construction of a house or the like, a synthetic resin sleeve 15 having flange portions 15 a at both ends of the through hole 12. Is attached, and a lid 15c (only the lid 15c inside the wall 11 is shown) is detachably screwed to the inner threaded portion 15b of the sleeve 15 inside and outside the wall 11. Then, when installing the home air conditioner, the pipe 13 such as the refrigerant pipe is inserted into the through hole 12 (in the sleeve 15) with the lid 15 c removed from the sleeve 15. Further, when the pipe cover 14 is attached to the outer wall surface 11a of the wall portion 11 with the sleeve 15 mounted, the flange portion 15a of the sleeve 15 on the outer end side of the pipe cover 14 and the through hole 12 will be described later. Interference is avoided.

  Therefore, the configuration of the piping cover 14 will be described in detail. As shown in FIGS. 1-4, the said piping cover 14 is equipped with the synthetic resin extension cover part 18 for covering the extension part 13a along the outer wall surface 11a of the piping 13, The extension cover part 18 is the following. An extension cover main part 18b and an extension attachment part 19 for attaching the extension cover main part 18b to the outer wall surface 11a are provided. Further, the pipe cover 14 includes a synthetic resin end cover 20 for covering the through hole 12 of the wall 11 and the insertion portion 13b of the pipe 13 with respect to the through hole 12, and the end cover 20 is an end cover. A part covering part main body 20c and an end attaching part 21 for attaching the end covering part main body 20c to the outer wall surface 11a are provided.

  The extension mounting portion 19 is formed to have a long shape with a substantially flat U-shaped cross section. A pair of locking grooves 19a are formed on the outer surfaces of both sides of the extension mounting portion 19 so as to extend in the longitudinal direction, and a plurality of insertion holes 19b are formed at predetermined intervals in the longitudinal direction at the center of the bottom portion. Before the pipe 13 is extended and arranged on the outer wall surface 11a of the wall portion 11, the extension mounting portion 19 is cut to a required length, and a screw 22 is screwed into the wall portion 11 from the insertion hole 19b. By doing so, the extension attachment part 19 is attached to the outer wall surface 11 a of the wall part 11.

  The extension cover body 18b is formed to have a long shape with a substantially inverted U-shaped cross section. A pair of engaging protrusions 18a are formed on the inner surfaces of both sides of the extension cover main body 18b so as to extend in the longitudinal direction. And after attaching the extension attachment part 19 to the outer wall surface 11a of the wall part 11, in the state which extended the piping 13 along the extension attachment part 19, this extension cover part main body 18b is required length (usually extension). The extension cover main body 18b is extended and attached by engaging the engagement protrusion 18a of the extension cover main body 18b with the locking groove 19a of the extension attachment part 19 and cutting the same to the same length as the attachment part 19). It is fixed on the part 19. Thereby, the extension part 13a of the piping 13 is covered.

  As shown in FIGS. 4 to 6, a pair of locking recesses 21 a are formed on the outer surface of the side wall 21 e formed on both sides of the end mounting portion 21, and a pair of insertion holes 21 b are formed on both ends of the bottom portion. Has been. Also, a flat arcuate raised portion 21c is formed at the bottom of the end attaching portion 21, and a pair of engagement holes 21d are formed at both ends of the raised portion 21c. Then, prior to inserting the pipe 13 into the through hole 12 of the wall portion 11, the end portion attaching portion 21 is extended by screwing the screw 23 from the insertion hole 21 b of the end portion attaching portion 21 to the wall portion 11. It is attached to the outer wall surface 11 a of the wall portion 11 adjacent to the attachment portion 19.

  The end cover main body 20c is formed in a substantially inverted U-shaped cross section so as to open to the outer wall surface 11a side when the wall portion 11 is attached to the outer wall surface 11a. A pair of engaging convex portions 20a are formed on both inner surfaces of the end cover main body 20c, and an engaging concave portion 20b is formed on the central inner surface of the opening end portion. And after attaching the edge part attaching part 21 to the outer wall surface 11a of the wall part 11, in the state which penetrated the piping 13 to the through-hole 12 of the wall part 11, the engagement convex part 20a of this edge part cover part main body 20c is made into. By engaging with the locking recess 21 a of the end attachment portion 21, the end cover main body 20 c is fixed on the end attachment portion 21. At this time, the base end portion of the end cover main body 20c is superposed on the outer surface of the front end portion of the extension cover main body 18b from the outside. In this state, the through hole 12 of the wall 11 and the insertion portion 13b of the pipe 13 with respect to the through hole 12 are covered. The concave and convex relationship between the engaging convex portion 20a and the engaging concave portion 21a is reversed, and the engaging convex portion 20a is provided on the end attaching portion 21 side and the engaging concave portion 21a is provided on the end covering portion main body 20c side. Also good.

  As shown in FIG. 1 to FIG. 4 and FIG. 7, a stepped notch 24 is formed at the open end (opening on the wall surface side) of the end cover main body 20 c. Then, as shown in FIG. 7, when the end cover main body 20 c is attached to the outer wall surface 11 a of the wall portion 11 with the sleeve 15 attached to the through hole 12 of the wall portion 11, this step difference is generated. The flange portion 15a of the outer sleeve 15 is disposed in the notch 24 so that interference between the opening end portion of the end cover main body 20c and the flange portion 15a of the sleeve 15 is avoided.

  An adapter 25 is detachably attached to the stepped notch 24 of the end cover main body 20c as necessary. The adapter 25 is formed of a synthetic resin so as to be substantially U-shaped as a whole. An insertion hole 25a and an engaging claw 25b are formed in the central portion of the adapter 25, and a pair of engaging pins 25c are projected from both sides. And as shown in FIG.1 and FIG.3, when the end cover main body 20c is attached to the outer wall surface 11a of the wall part 11 in the state where the sleeve 15 is not attached to the through hole 12 of the wall part 11, The adapter 25 is fitted and disposed in the stepped notch 24 of the end cover main body 20c.

  That is, when the sleeve 15 is not attached to the through hole 12, the screw 26 is screwed from the insertion hole 25 a of the adapter 25 to the wall portion 11 when the end cover portion 20 is attached to the outer wall surface 11 a of the wall portion 11. By combining, the adapter 25 is attached to the outer wall surface 11 a of the wall portion 11 so that the adapter 25 is positioned on the outer peripheral edge of the through hole 12. At this time, the engaging pins 25 c of the adapter 25 are engaged with the engaging holes 21 d of the end attaching portion 21 from the outer wall surface 11 a side, so that both end portions of the adapter 25 are engaged with the end attaching portion 21. Stopped. In this state, the end cover main body 20c is attached to the end attachment portion 21, whereby the engagement recess 20b of the end cover main body 20c is engaged with the engagement claw 25b of the adapter 25, and the adapter 25 is It arrange | positions in the step-shaped notch 24 of the edge part cover part main body 20c. Thereby, the stepped notch 24 of the end cover main body 20c is closed. The concave and convex relationship between the engagement pin 25c and the engagement hole 21d may be reversed, and the engagement pin 25c may be provided on the end attaching portion 21 side and the engagement hole 21d may be provided on the adapter 25 side. Further, the concave / convex relationship between the engagement recess 20b and the engagement claw 25b may be reversed, and the engagement recess 20b may be provided on the adapter 25 side and the engagement claw 25b may be provided on the end cover main body 20c side.

Next, a construction method in the case of covering the pipe 13 such as the refrigerant pipe of the home air conditioner using the pipe cover 14 configured as described above will be described.
First, as shown in FIGS. 1, 3, 5, and 6, a case where the sleeve 15 is not attached to the through hole 12 of the wall 11 of the house will be described. First, the adapter 25 is attached to the outer wall surface 11a at the outer peripheral edge of the through hole 12 with the screw 26, and the screw 25 is engaged with the engaging hole 21d of the end attaching portion 21 with the engaging pin 25c of the adapter 25. 23, the end attachment portion 21 is attached to the outer wall surface 11a. In this manner, the adapter 25 and the end attachment portion 21 are attached and fixed to the outer wall surface 11a in a positioned state. In this case, the adapter 25 and the end attaching portion 21 are assembled in advance by engaging the engaging pins 25c and the engaging holes 21d, and in this state, the adapter 25 and the end attaching portion 21 are attached to the wall portion. 11 around the through-holes 12 may be simultaneously fixed by screws 26 and 23. Next, the extension attachment portion 19 is attached to the outer wall surface 11 a of the wall portion 11 with the screw 22. In this state, the pipe 13 extending from the indoor unit of the air conditioner is inserted into the through hole 12, and the pipe 13 is extended to the outdoor unit along the end attachment part 21 and the extension attachment part 19.

  Thereafter, when the extension cover main body 18b is mounted on the extension mounting portion 19 by the engagement of the engaging protrusion 18a and the locking groove 19a, the extension cover main body 18b extends the pipe 13 along the outer wall surface 11a. The portion 13a is covered. Subsequently, when the end cover main body 20c is mounted on the end mounting portion 21 by the engagement of the engaging convex portion 20a and the locking concave portion 21a, the base end portion of the end cover main body 20c becomes the extended cover main body. The end portion 18b is superposed on the outer surface, and the end cover main body 20c covers the through hole 12 and the insertion portion 13b of the pipe 13 with respect to the through hole 12.

  At this time, the engaging recess 20b of the end cover main body 20c is engaged with the engaging claw 25b of the adapter 25, and the adapter 25 is disposed in the stepped notch 24 of the end cover main body 20c. The notch 24 is held closed. Therefore, when the end cover main body 20c is attached to the outer wall surface 11a of the wall 11 in a state where the sleeve 15 is not attached to the through hole 12, the stepped cutout 24 of the end cover main body 20c is used. An open portion is not formed between the opening end of the end cover main body 20c and the outer wall surface 11a. Therefore, it is possible to prevent the possibility of dust, rainwater, or the like from entering the inside of the stepped notch 24.

  In addition, while the piping 13 is inserted into the through hole 12 and extended to the outdoor unit, the piping 13 can be covered with the piping cover 14. In this case, after fixing the adapter 25 with the screw 26 in the same manner as described above, the end attaching portion 21 is inserted between the wall portion 11 and the pipe 13 and fixed to the wall portion 11 with the screw 22, and then the same manner. The extension mounting portion 19 is inserted between the wall portion 11 and the pipe 13 and fixed to the wall portion 11 with screws 22. Subsequent operations are the same as described above.

  On the other hand, as shown in FIGS. 2 and 7, even when the sleeve 15 is attached to the through hole 12, the end attachment portion is attached to the outer wall surface 11a of the wall portion 11 by the screws 22 and 23 in the same manner as described above. 21 and the extension attachment part 19 are attached. However, in this case, since the flange portion 15a of the outer sleeve 15 is located on the outer wall surface 11a at the outer peripheral edge of the through hole 12, the adapter 25 is not attached to the outer wall surface 11a. In this state, the pipe 13 is inserted into the through-hole 12 and the pipe 13 is extended along the end attachment portion 21 and the extension attachment portion 19 in the same manner as described above.

  Thereafter, when the extension cover main body 18b is mounted on the extension mounting portion 19, the extension cover main body 18b covers the extension portion 13a of the pipe 13. Subsequently, when the end cover main body 20c is mounted on the end mounting portion 21, the end cover main body 20c covers the through hole 12 and the insertion portion 13b of the pipe 13 with respect to the through hole 12. At this time, the stepped notch 24 in which the adapter 25 of the end cover main body 20c does not exist is disposed corresponding to the flange portion 15a of the outer sleeve 15, and the opening end of the end cover main body 20c and the flange portion of the sleeve 15 are arranged. Interference with 15a is avoided, and the flange portion 15a is fitted into the stepped notch 24 without a gap. Therefore, interference between the opening end portion of the end cover main body 20c and the flange portion 15a of the sleeve 15 can be avoided, and a gap is formed between the end cover main body 20c and the outer wall surface 11a of the wall portion 11. The end cover main body 20c can be firmly fixed in a state where the end cover main body 20c is joined to the outer wall surface 11a.

  In the above description, after the adapter 25 is attached to the outer wall surface 11a, the end cover main body 20c is attached to the adapter 25. Conversely, the adapter 25 is attached to the end cover main body 20c. You may attach the edge part cover part main body 20c to the outer wall surface 11a of the wall part 11 in the state attached to the step-shaped notch 24 side.

  Moreover, although the said description demonstrated the case where the piping 13 was followed along the outer wall surface 11a of the wall part 11, when making it follow an inner wall surface, you may use the piping cover 14 of this embodiment. Further, in the above description, the case where the pipe 13 is extended in the vertical direction has been described. However, when the pipe 13 is extended in the horizontal direction or the oblique direction, the pipe cover 14 of this embodiment may be used.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
-Provide an opening for ventilation in the end cover main body 20c. That is, when the wall portion 11 is provided with a ventilation opening, an opening corresponding to the ventilation opening is provided on the wall surface side of the end cover main body 20c, and air is circulated between the opening. An opening is provided in the side wall of the end cover main body 20c so that ventilation in the room of the house can be performed.

  -As shown to Fig.8 (a)-(c), while the end part attaching part 21 of the end part cover part 20 is comprised in the substantially flat U shape substantially the same as the extension attaching part 19 of the extension cover part 18. A stepped notch 24 for avoiding interference with the flange portion 15a of the sleeve 15 is formed in the end mounting portion 21 thereof. Accordingly, the adapter 25 is fitted into the stepped notch 24. The adapter 25 and the end attachment portion 21 may be fixed by providing the engagement recess 20b and the engagement claw 25b in the above embodiment in the end cover main body 20c and the end attachment portion 21, respectively.

  In the embodiment, the holes 19b, 21b, and 25a for fixing screws are formed in the extension mounting portion 19, the end mounting portion 21, and the adapter 25. However, instead of these holes 19b, 21b, and 25a, the bottom Form a recess with a thin wall. Therefore, the screw penetrates the bottom wall and is fixed to the outer wall surface 11a.

  9A and 9B, stepped portions 21f are formed at both ends of the raised portion 21c of the end mounting portion 21, and both ends 25f of the adapter 25 are connected to the lower surface of the raised portion 21c and the stepped portion 21f. Put it between the top surface. In this way, the engagement state between the engagement pin 25c and the engagement hole 21d can be stabilized, and the fixing operation to the outer wall surface 11a is facilitated, and the fixed state is stabilized. In addition, when comprised in this way, it is preferable to extend the both ends 25f of the adapter 25 a little so that the contact area with respect to the upper surface of the level | step-difference part 21f may be enlarged so that FIG.9 (a) may show. In this modification, it is desirable that the upper end of the engagement pin 25c be hemispherical so that the engagement pin 25c can be easily inserted into the engagement hole 21d.

  10 (a) and 10 (b), instead of the engaging cover 20a and the locking recess 21a of the end cover 20 and the end mounting part 21 in the above embodiment, the end cover 20 A locking ring 20g is provided on the inner surface, and an engagement claw 21g is provided on the end mounting portion 21. In this modification, the side wall of the end cover 20 is bent inward to release the engagement between the locking ring 20g and the engaging claw 21g, and the locking ring 20g is engaged with the engaging claw. It can be removed from 21g.

The principal part perspective view which shows the state which used the piping cover of one Embodiment in the condition where a sleeve does not exist. Similarly, the principal part perspective view which shows the state which used the piping cover of one Embodiment in the condition where a sleeve exists. The principal part longitudinal cross-sectional view of the piping cover of FIG. The exploded perspective view of the piping cover. The principal part cross-sectional view of the piping cover. The principal part cross-sectional view in a different position from FIG. The principal part perspective view which shows a piping cover in the use condition different from FIG. (A)-(c) is a side view which shows each different embodiment, bb sectional drawing, cc sectional drawing. (A) and (b) are the decomposition | disassembly partial perspective views and partial sectional views which show a modification, respectively. (A) and (b) are a partial perspective view and a partial sectional view showing a further modification, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Wall part, 11a ... Outer wall surface, 12 ... Through-hole, 13 ... Piping, 13a ... Extension part, 13b ... Insertion part, 14 ... Piping cover, 15 ... Sleeve, 15a ... Flange part, 18 ... Extension covering part, 19 ... extension attachment part, 20 ... end cover part, 21 ... end part attachment part, 24 ... stepped notch, 25 ... adapter.

Claims (4)

In the pipe cover provided with a cover part for covering the through hole of the wall part and the pipe inserted through the through hole,
The cover includes an end cover for covering the through hole and a portion inserted through the through hole of the pipe. The end cover includes an end cover main body and the end cover main body. An end mounting portion for mounting on a wall surface,
In the opening on the wall surface side of the end cover main body, a stepped notch for avoiding interference with the flange portion of the sleeve mounted in the through hole is formed, and the stepped notch can be attached and detached. Provide a U-shaped adapter to be installed ,
The adapter and the end portion attaching portion are configured to be engageable by a concavo-convex relationship . An extension covering portion for covering the extension portion along the wall surface of the pipe so as to cover the pipe inserted into the through hole of the wall portion forming the wall surface, and extending along the wall surface; In the pipe cover provided with an end cover part for covering the part inserted through the through hole of the pipe,
The end cover includes an end cover main body, and an end attachment for attaching the end cover main body to the outer wall surface,
In the opening on the wall surface side of the end cover main body , a stepped notch is formed to avoid interference with the flange portion of the sleeve mounted in the through hole, and the stepped notch can be attached to and detached from the opening. A U-shaped adapter to be attached to the
The adapter and the end portion attaching portion are configured to be engageable by a concavo-convex relationship . 3. An engagement claw that engages with the engagement ring is provided at the end attachment portion, and an engagement claw that engages with the engagement ring is provided at the inner surface of the end cover main body. Piping cover as described in A flat arc-shaped raised portion is provided at the bottom of the end attaching portion, and step portions are provided at both ends of the raised portion, and when the end attaching portion and the adapter are engaged, both ends of the adapter are provided. The pipe cover according to any one of claims 1 to 3, wherein the pipe cover is sandwiched between a lower surface of the raised portion and an upper surface of the stepped portion.

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