JP2005240946A - Instrument connection pipe and pipe arrangement unit using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide instrument connection pipe enabling sure connection of an instrument and pipe in a limited space, and preventing clogging of flowing material in the instrument connection pipe, and also to provide pipe arrangement unit using the same. <P>SOLUTION: In an instrument connection pipe 1 having bellows formed on a whole circumference and made of flexible material, the instrument connection pipe is made easy to get longer in a specific circumference direction by making height of the bellows in a predetermined circumference direction higher than other circumference direction, the instrument connection pipe is easy to bend in a specific circumference direction by making height of the bellows in the predetermined circumference direction lower than other circumference direction, and clogging of material passing through inside of the instrument connection pipe is prevented by putting the specific circumference direction in which the height of the bellows is low in a lower side in a view of an instrument connection pipe attaching condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an appliance connection pipe for connecting an appliance such as a urinal or a urinal and piping, and a piping unit using the same.

  In recent years, in a building where tenants occupy each floor, the floor and toilet have been renovated in accordance with the tenant's occupancy on a specific floor. In this renovation, there are two ways to perform the plumbing for the toilet and the plumbing for the ceiling and the plumbing for the floor. However, when performing ceiling and back piping work, floor work on the upper and lower two floors including the floor to be repaired and the floor below it is necessary, and the floor below the floor to be constructed cannot be used for the piping work.

  On the other hand, there is no such thing as floor piping work, and there is little work to make holes in the slab, so there is no need to damage the building frame. In addition to this, there are cases where electric wires or the like are arranged in the slab, but these can be prevented from being damaged in the piping work. Therefore, regarding the repair of the toilet, the floor piping work is preferable to the ceiling back piping work.

  FIG. 7 shows an example in which a general instrument connection pipe is used to connect the equipment such as a urinal and a urinal to the pipe when performing this floor piping work.

  As can be seen from this figure, the pipe 70 is disposed below the lining 80, and the toilet 30 is disposed in the vicinity of the lining 80. Here, consider the case where the appliance drain 31 and the pipe 70 of the toilet 30 are attached by a general appliance connection pipe 90. If the appliance connection pipe 90 of 75A is normally attached to the appliance drain 31 having a height H (usually around 170 mm) from the floor, it may be attached only when a part of the pipe 70 is buried as shown in FIG. I understand. And in order to solve this, it is necessary to use the instrument connection pipe | tube 91 provided with the bellows as shown in FIG. 8 (for example, refer patent document 1 and patent document 2).

Shokai 52-5465 (page 3-5, Fig. 1) JP 2002-195464 (page 3-5, FIG. 1)

  On the other hand, a problem in carrying out floor piping work is that the size of the lining 80 in the toilet is limited because it is difficult to make a large toilet space. That is, since the toilet space is limited, the lining itself cannot be enlarged. Then, it is necessary to pass the pipe 70 through the lining 80 of the limited size and to dispose the appliance connecting pipe 91 between the toilet 30 and the pipe 70, but the distance between the pipe 70 and the appliance drain 31. Therefore, it is necessary to devise the shape of the instrument connecting pipe 91 in the lining. In addition, the instrument connection pipe | tube 91 as described in patent document 1 and patent document 2 has the structure which formed the bellows uniformly over the perimeter of the said connection pipe circumferential direction. When the bending tolerance of the appliance connecting pipe in the downward bending direction is large, it is advantageous in connecting the appliance and the pipe. However, the appliance connecting pipe 91 as described in Patent Document 1 and Patent Document 2 is uniformly in all directions. Although there is an advantage of being bent, since the bending tolerance in a specific direction is small, the corresponding range of connection between the toilet 30 and the pipe 70 is limited, and the connection between the toilet 30 and the pipe 70 cannot be made. Or the connection work is extremely difficult, and the piping work may be hindered.

  Further, when a plurality of toilets are connected as shown in FIG. 9, the drop of the instrument connecting pipe 91 that connects the drain outlet of the toilet 30 and the pipe 71 becomes large depending on the location (see FIG. 9, Δh3). In the range where the instrument connecting pipe 91 having the normal bellows structure described in Patent Document 1 and Patent Document 2 is bent, it cannot be handled. In order to connect, it is effective to bend the instrument connecting pipe side to the piping side to some extent. Therefore, as shown in FIG. 10, the instrument connecting side end portion 92a has a predetermined bending angle of 5 °, 25 °, 40 °, etc. There are many types of instrument connecting pipes 92 that are bent at different angles, depending on the bending angle. If various types of instrument connecting pipes 92, 92 ′, 92 ″, etc. having fixed bending portions 92a with different bending angles at the end portions are prepared, it is not possible to share parts, and inventory management is performed. Therefore, an instrument connection pipe having a structure with a large bending allowance in a specific direction that can cope with various positional relationships between the instrument drain and the pipe is desirable. It is.

  In addition, if filth is allowed to flow with the appliance connection pipe attached between the appliance and the pipe, the filth accumulates in the concave portion of the bellows on the lower side in the circumferential direction inside the appliance connection pipe, and the cross section area of the appliance connection pipe is increased. Narrowing and clogging of dirt in the instrument connecting pipe may occur.

  An object of the present invention is to provide an instrument connection pipe that can reliably connect an instrument and piping in a limited space and prevents clogging of passing materials in the instrument connection pipe, and a piping unit using the instrument connection pipe. It is in.

  In order to solve the above-described problems, an instrument connecting pipe according to the present invention is an instrument connecting pipe made of a flexible material in which bellows is formed on the entire circumference. It is characterized by being higher than the height of the circumferential bellows.

  By configuring the instrument connecting tube in this way, the instrument connecting tube can be easily extended in a specific circumferential direction.

  Moreover, the instrument connecting pipe according to claim 2 of the present invention is an instrument connecting pipe made of a flexible material having a bellows formed on the entire circumference thereof, and the height of the bellows in the predetermined circumferential direction is set in another circumferential direction. It is characterized by being lower than the height of the bellows.

  By configuring the instrument connecting tube in this way, the instrument connecting tube can be easily bent in a specific circumferential direction.

  According to a third aspect of the present invention, there is provided an instrument connecting pipe according to the third aspect of the present invention, wherein the instrument connecting pipe is made of a flexible material having a bellows formed on the entire circumference, and the height of the bellows in the predetermined circumferential direction is increased. The feature is that the height of the bellows in the circumferential direction opposite to is reduced.

  By configuring the instrument connecting tube in this way, it is possible to considerably widen the tolerance for bending in a specific circumferential direction.

  The instrument connecting pipe according to claim 4 of the present invention is the instrument connecting pipe according to claim 2 or claim 3, wherein the specific circumferential direction in which the height of the bellows is reduced refers to the instrument connecting pipe. It is an inside area with respect to the bending direction of the said instrument connection pipe in the state connected to the instrument.

  The concave portion of the bellows inside the instrument connecting tube located inside the bending direction when viewed in the attached state can be made to have a small volume, and the accumulation of the passing material in the instrument connecting tube is reduced in the concave portion. Moreover, since the height of the inner bellows is low, the ease of bending is improved and the connection to the piping is facilitated.

  Moreover, the instrument connecting pipe according to claim 5 of the present invention is the instrument connecting pipe according to any one of claims 1 to 4, wherein the instrument connecting pipe forms an accordion only in a predetermined circumferential direction. And one end of the instrument connecting pipe is connected to the instrument, and the central axis of the one end is parallel or coincides with the central axis of the connection opening of the instrument to which the instrument connecting pipe is attached. It is characterized by that.

  By using such an instrument connection pipe, it is possible to sufficiently bend in the vicinity of the connection portion between the instrument connection pipe and the instrument. In addition, when this one end is attached obliquely to the central axis of the connection opening of the appliance, when the appliance connection tube is crushed and connected between the appliance and the pipe, the water flow inside the appliance connection tube The effective diameter that affects the characteristics becomes narrow, and clogging of the passing material tends to occur in this portion. However, by making the central axis of one end parallel or coincide with the central axis of the connection opening of the instrument to which the instrument connection pipe is attached, the one end of the instrument connection pipe is a so-called straight part with respect to the connection opening of the instrument. And is not attached obliquely as described above, and an effective diameter inside the instrument connecting pipe can be secured. As a result, the passing material does not become clogged inside the instrument connecting pipe.

  Moreover, the instrument connecting pipe according to claim 6 of the present invention is the instrument connecting pipe according to any one of claims 1 to 5, wherein the instrument connecting pipe is directed from one end to the other end connected to the instrument. It is characterized by a large cross-sectional area of the connecting pipe.

  By using such an instrument connection pipe, the instrument and the pipe can be reliably connected even in a narrow space, and in addition, clogging of passing materials in the instrument connection pipe is prevented.

  The piping unit according to claim 7 of the present invention is a piping unit in which finishing is arranged on the front and top surfaces of a lining frame, piping is provided inside, and the appliance is connected via an appliance connecting pipe. The appliance connecting pipe according to any one of claims 1 to 6 is used as the connecting pipe.

  By configuring the piping unit in this way, it is possible to provide a piping unit that saves space and is less likely to cause clogging of passing materials in the instrument connection pipe.

  According to the present invention, the instrument connecting pipe is easily bent in a specific direction. That is, it can be set as the instrument connection pipe of the bellows structure whose bending tolerance is larger than the conventional instrument connection pipe of the bellows structure. As a result, the appliance and the pipe can be reliably connected in a limited space by a small number of types of appliance connection pipes.

  As a result, when the appliance connection pipe is used to connect the toilet urinals installed in the building and piping, the floor of the specific floor of the building where tenants occupy each floor is repaired. In addition to avoiding ceiling and back piping work that can no longer be used on the floor, it is possible to easily install the appliance connection pipe in a small lining, improving the workability of toilet repair and saving the toilet space.

  In addition, it is possible to reduce the accumulation of passing materials in the bellows recess located on the lower side in the instrument connection pipe with the instrument connection pipe attached.

  Hereinafter, an instrument connection pipe and a piping unit using the same according to an embodiment of the present invention will be described. The appliance connection pipe 1 according to an embodiment of the present invention is installed in a toilet lining and connects a cheese (T-shaped pipe) receiving port that forms part of the piping and an appliance drainage port of a toilet (tool). It is a connecting pipe. The instrument connecting tube 1 has a flexible portion made of soft vinyl chloride, and as shown in FIG. 1, a bellows 20 is formed in a predetermined portion around it, and as shown in FIG. The water flow cross-sectional area of the end portion 11 is determined according to the diameter of the drain on the appliance side, and the water flow cross-sectional area of the other end portion (pipe connection side end portion) 12 is larger than that of the one end portion 11. (Refer to the comparison between the tube diameter D1 and the tube diameter D2 in FIG. 4). One end 11 of the appliance connecting pipe 1 is connected to the appliance drain 31 (see FIGS. 2 and 4) of the toilet 30 via the drain flange 40, and the other end 12 is clamped to the receptacle 51 of the cheese 50. 60 to be connected.

  Moreover, as can be seen from FIGS. 2 and 4, the instrument connecting tube 1 has a bent portion in the vicinity 23 of the one end 11, and the instrument connecting tube 1 is located between the toilet 30 and the cheese 50. In the connected state, the bent portion is connected so that the one end portion 11 is higher than the other end portion 12, and the opening center axis X1 and the other end of the one end portion 11 as viewed from above in the state where the instrument connecting pipe is attached. The opening center axis X2 of the portion 12 is attached so as to be deviated (see FIG. 4). Further, the central axis of the one end portion 11 in the vicinity of the appliance drain of the appliance connecting pipe is attached in parallel with the central axis of the appliance drain. By having the above configuration, the appliance connecting pipe 1 is attached in a state where the vicinity of one end is bent three-dimensionally in a limited narrow space between the appliance drain 31 of the toilet 30 and the cheese 50. It has become.

  A bellows 20 is formed on the instrument connecting tube 1 in the whole circumferential direction from one end side to the other end side in almost the entire longitudinal direction. Then, as shown in FIG. 2, the height Ha of the bellows 20a in the upper portion of the portion that extends in the circumferential direction with the appliance connecting pipe 1 attached, that is, when the appliance connecting tube 1 is attached, is the other circumference. It is formed higher than the height of the bellows in the direction (middle and lower side in the circumferential direction). On the other hand, the portion that compresses in the circumferential direction with the appliance connecting pipe 1 attached, that is, the portion that opposes the bellows 20a in the upper portion, and the lower portion of the bellows 20b in the attached state of the appliance connecting tube 1 is seen. The height Hb is formed to be lower than the height of the bellows in the other circumferential directions (the middle and upper sides in the circumferential direction). Further, as shown in FIG. 2, when the instrument connecting pipe 1 is attached, the bellows 21 is formed only on the outer side of the bent portion and the bellows is formed on the inner side of the bent portion. It is not formed and the inside of the bent portion forms a bellows non-formation region 25 of the instrument connecting pipe 1.

  One end portion 11 of the instrument connecting pipe 1 is formed to expand so as to coincide with the tapered portion 41 of the drainage flange 40 attached to the instrument drainage port 31 of the toilet 30. And the one end part 11 of the instrument connection pipe 1 is fixed to the taper part 41 of the drainage flange 40 by an adhesive or a fastening means (not shown), and is connected to the instrument drainage port 31 of the toilet 30 via the drainage flange 40 in a liquid-tight manner. It has come to be.

  Further, the other end portion 12 of the appliance connecting tube 1 is formed so as to cover the receiving port 51 of the cheese 50. The other end portion 12 is attached to the receiving port 51 of the cheese 50 via an adhesive and is fastened by a fastening ring 60. Thereby, the other end side of the appliance connection pipe 1 can also be liquid-tightly connected to the receiving port 51 of the cheese 50.

  Hereinafter, the operation of the instrument connecting pipe 1 having such a structure will be described. The appliance connecting pipe 1 has flexibility and is connected to the appliance drain 31 of the toilet 30 at one end side of the appliance connecting pipe 1 at a high height via a drainage flange 40. The other end 12 is a position lower than the appliance drain 31 of the toilet 30 and is displaced (biased) from the appliance drain 31 when viewed from above when the appliance connecting pipe 1 is attached. It is attached to the receiving port 51 of the cheese 50 to be made.

  In addition, when attaching the instrument connection pipe 1 to the horizontal piping 71 shown in FIG. 9, the instrument connection pipe 1 is attached to the horizontal pulling pipe 71 so that the direction is such that the flow is directed to the lower gradient side. The connecting pipe 1 is connected to the horizontal pulling pipe 71. Thereby, the backflow in the piping 71 can be prevented.

  By attaching the appliance connecting pipe 1 in this way, the appliance connecting pipe 1 is attached in a state where the vicinity of one end of the appliance connecting pipe 1 is bent three-dimensionally as seen from the attached state of the appliance connecting pipe 1, and The upper side in the direction is attached in an extended state over the entire longitudinal direction, and the lower side in the circumferential direction of the instrument connecting tube 1 is attached in a contracted state over the entire longitudinal direction. As a result, in addition to enabling space-saving installation, it is also possible to cope with a steep slope between piping and equipment.

  In addition, since the height Ha of the bellows 20a formed on the upper side in the circumferential direction when viewed in the attached state of the instrument connecting tube 1 is formed higher than the height of the bellows in the other circumferential directions, the bellows 20a on the upper side in the circumferential direction is formed. The allowable deformation amount becomes sufficiently large and can sufficiently cope with such elongation. On the other hand, the height Hb of the bellows 20b formed on the lower side in the circumferential direction when viewed in the attached state of the instrument connecting pipe 1 is formed lower than the height of the other bellows in the circumferential direction. However, the bellows itself does not hinder the compression, and the instrument connecting pipe 1 can be sufficiently bent until the curvature of the peripheral surface has a small curvature radius.

  The instrument connecting pipe 1 is attached to the toilet 30 in the most bent state on one end side, but only in the circumferential direction in which the outer peripheral portion extends with respect to the bending of the instrument connecting pipe 1 on the one end side when viewed in the attached state. Since the bellows is formed and the bellows is not formed in the circumferential direction in which the outer peripheral portion is compressed, the allowable range for bending in the vicinity of one end portion of the instrument connecting tube 1 is the conventional instrument connecting tube in which the bellows is formed in the entire circumferential direction. On the other hand, it spreads dramatically.

  That is, it can be set as the instrument connection pipe with a large bending | flexion tolerance compared with the conventional instrument connection pipe with a bellows. Specifically, as shown in FIG. 6 (a), the conventional instrument connection pipe having the bellows structure can be bent up and down by an angle α in an attached state with respect to the neutral extending direction NL. The amount of bending in the downward direction for improving the attachment property of the instrument was insufficient, but the instrument connecting tube according to this embodiment is in the attached state with respect to the neutral extension direction NL as shown in FIG. It is possible to bend in the range of the angle α upward and the angle β considerably larger than the angle α downward.

  Further, the height of the bellows 20b formed in the lower portion in the circumferential direction when viewed in the attached state of the instrument connecting pipe 1 is formed lower than the other portions, so that a recess formed in the bellows inner wall in the lower portion in the circumferential direction. Is smaller than that of a conventional instrument connecting pipe having a bellows (see the comparison between the concave portion volume VA at the top of the bellows and the concave portion volume VB at the bottom of the bellows shown in FIG. 5). Therefore, even if filth and toilet paper flow into the appliance connection pipe from the appliance drain 31 of the toilet 30, the filth and toilet paper adhere to the recess in the lower circumferential direction of the inner wall of the bellows and flow cross-sectional area of the appliance connection pipe 1 There is no narrowing. This makes it possible to reduce the clogging of filth and toilet paper in the appliance connecting pipe as compared with a high bellows crest.

  Further, since the bellows 20 is formed from the other end portion 12 of the instrument connecting tube 1 over the entire circumference in the constant region in the longitudinal direction, the attachment position of the other end portion 12 of the instrument connecting tube 1 and the cheese tube 50 is determined. Even if the individual instrument connecting pipes are slightly deviated, the mounting position deviation can be absorbed by the bellows 20 formed in this portion of the instrument connecting pipe 1.

  As a result, when the size of the lining is limited, in order to perform floor piping work, the space between the toilet bowl and the pipe is narrow, and the appliance connection pipe must be installed in a complicated bent state. Can also be dealt with reliably.

  In addition, when installing toilets in a series, it is necessary to connect the horizontal pipes with a slope, and the horizontal pipes must have a slope. The positional relationship in the direction is different for each instrument connecting pipe to be attached. Even in such a case, the bellows formed over the entire circumference in the constant region in the longitudinal direction from the other end of the instrument connecting pipe. 20 can absorb the deviation of the mounting position in the height direction. This eliminates the need for preparing various types of bellows-equipped instrument connecting pipes having bending portions with different bending angles at one end attached to the instrument drainage port so as to correspond to such horizontally drawn piping.

  Moreover, since the water flow cross-sectional area of the instrument connecting pipe 1 increases from one end connected to the toilet to the other end, the instrument connecting pipe is crushed and connected between the toilet and the pipe. At this time, in the bent portion of the instrument connecting pipe 1, the effective diameter that affects the water flow characteristics inside the instrument connecting pipe 1 is narrowed, but the instrument connection is gradually increased from one end connected to the toilet to the other end. Since the cross-sectional area of the pipe 1 is large, it is possible to secure an effective cross-sectional area at the bent part when it is crushed and connected, and the cheese and toilet that form part of the pipe in a narrow space In addition to being able to connect securely, it prevents dirt and toilet paper from clogging in the appliance connection pipe.

  By connecting the appliance connecting pipe 1 between the toilet bowl and the pipe and constructing a piping unit having the toilet connecting pipe 1 and the toilet connecting pipe 1 for connecting the toilet bowl, the filth is drained from the toilet bowl. However, it is possible to reduce the amount of filth entering the recess of the inner wall of the bellows as compared with a high bellows mountain.

  In addition, since the central axis of one end of the instrument connecting pipe and the central axis of the instrument drain are parallel, one end of the instrument connecting pipe is formed as a straight portion perpendicular to the opening surface of the instrument drain. When the connecting pipe is attached between the instrument and the pipe, one end of the instrument connecting pipe is not crushed, and the water passage performance at this part is not deteriorated. As a result, clogging of filth is difficult to occur.

  As described above, the appliance connecting pipe 1 is formed so that the upper bellows 20a in the circumferential direction is higher than the other bellows in the circumferential direction when viewed in the attached state, and the bellows 20b in the lower circumferential direction is the other bellows in the other circumferential direction. Because it is formed lower than that, when connecting the appliance drain with different heights and piping at a close distance, the appliance connecting pipe can be bent and connected in the vicinity of the appliance, and the appliance connecting pipe and piping are connected. Even if the attachment position of the instrument connection pipe differs depending on the gradient of the pipe, it can be absorbed by the deformation of the bellows 20.

  Therefore, even in a narrow space, the toilet bowl and the pipe can be reliably connected in a state where the one end side of the instrument connecting pipe is considerably bent and the other end side can be expanded to some extent. Thereby, it is possible to cope with various positional relationships between the appliance drain and the pipe even in a narrow space in the lining.

  Moreover, even if filth is drained from the toilet bowl, filth and toilet paper do not enter and accumulate in the inner concave portion of the bellows, and all the filth can flow through the pipe.

  And such an instrument connection pipe is used in a piping unit that has a finish on the front and top surfaces of the lining frame, has a pipe inside, and connects the instrument via the instrument connection pipe. It is possible to realize a piping unit that saves space with the instrument connecting pipe.

  The instrument connecting pipe provided with the bellows was made of soft vinyl chloride in this embodiment, but is not limited to this, and can be made of any material as long as it is flexible and water resistant. May be.

  Moreover, it cannot be overemphasized that an appliance connection pipe | tube is not limited to the use which connects a toilet bowl and piping, but can be used also for the use which connects a urinal and piping.

  Moreover, although the other end part of the instrument connection pipe was attached to the receptacle of cheese through the adhesive and the fastening metal fitting, it is not necessarily limited to this and may be attached only by the fastening metal fitting.

  Moreover, although cheese and the pipe connected to this were described about the hard vinyl chloride pipe | tube, it is applicable similarly also to a steel pipe and a stainless steel pipe | tube.

  Moreover, the attachment position relationship between the appliance connection pipe and the appliance and the pipe is not limited to the attachment position relationship of the above-described embodiment, and includes any attachment position relationship that exhibits the water passing performance of the appliance connection pipe.

  The appliance connection pipe according to the present invention is not limited in its application range for draining filth and toilet paper by connecting a urinal or urinal to a pipe, and other so-called slurry fluid is allowed to flow from the appliance to the pipe. It is also applicable to cases.

It is the perspective view which looked at the instrument connecting pipe concerning one Embodiment of this invention from the diagonal side. It is a side view in the state where the instrument connection pipe shown in Drawing 1 was attached to an instrument and piping. It is the perspective view which looked at the instrument connection pipe | tube shown in FIG. 1 from diagonally upward. It is the figure seen from the arrow Y direction of FIG. 2 in the state which attached the instrument connection pipe | tube shown in FIG. 1 to the instrument and piping. FIG. 5 is an enlarged cross-sectional view (FIG. 5A) of an A bellows 20 a in part A in FIG. 2 and an enlarged cross-sectional view (FIG. 5B) of a bellows 20 b in part B in FIG. 2. It is the figure which showed the bending | flexion tolerance (FIG. 6 (a)) of the conventional instrument connection pipe with a bellows, and the bending tolerance (FIG.6 (b)) of the instrument connection pipe concerning this embodiment. It is the schematic which showed the state which connected the conventional appliance connection pipe between the toilet bowl and piping by floor piping construction. It is the schematic which showed the state which connected the conventional instrument connection pipe | tube with a bellows between the toilet bowl and piping. It is the schematic which showed the state which each connected the several instrument connection pipe | tube attached to the several toilet bowl to the horizontal piping. It is the schematic which showed the state which connected between the toilet bowl and piping with the modification provided with the fixed bending part in the edge part of the conventional instrument connection pipe with a bellows.

Explanation of symbols

1 device connection pipe 11 one end (device connection side end)
12 Other end (Pipe connection side end)
20, 20 a, 20 b bellows 21 bellows 23 vicinity portion 25 bellows non-formation region 30 toilet bowl 31 appliance drainage port 40 drainage flange 41 taper portion 50 cheese 51 receiving port 60 tightening fitting 70 piping 80 lining 90 appliance connection tube 91 appliance connection tube 92, 92 ', 92 "... Instrument connecting pipe 92a Fixed bending part

Claims (7)

  An instrument connection tube made of a flexible material having a bellows formed on the entire circumference, wherein the height of the predetermined bellows in the circumferential direction is higher than the height of the bellows in other circumferential directions. .   An instrument connection tube made of a flexible material having a bellows formed on the entire circumference, wherein the height of the predetermined bellows in the circumferential direction is lower than the height of the bellows in the other circumferential direction. .   In the instrument connecting pipe made of a flexible material having a bellows formed on the entire circumference, the height of the predetermined bellows in the circumferential direction is increased and the height of the bellows in the circumferential direction facing the bellows is lowered. Instrument connecting tube.   The specific circumferential direction in which the height of the bellows is lowered is an inner region with respect to the bending direction of the instrument connecting pipe in a state where the instrument connecting pipe is connected to the instrument. Or the instrument connecting pipe of Claim 3.   The instrument connecting tube includes one end portion that forms a bellows only in a predetermined circumferential direction, and one end portion of the instrument connecting tube is connected to the instrument, and a central axis of the one end portion is attached to the instrument connecting tube. The instrument connection pipe according to any one of claims 1 to 4, wherein the instrument connection pipe is parallel or coincident with a central axis of the connection opening of the instrument.   The instrument connecting pipe according to any one of claims 1 to 5, wherein a water flow cross-sectional area of the instrument connecting pipe increases from one end connected to the instrument to the other end. Connection tube. In the piping unit which arrange | positions finishing to the front and upper surface of the flame | frame of a lining, has piping inside, and connects an instrument via an instrument connecting pipe, The said instrument connecting pipe is any one of Claims 1 thru | or 6. A piping unit using the appliance connecting pipe described.

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