JP2000346251A - Corrugated pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated pipe which can be easily bent as compared with a conventional one. SOLUTION: This corrugated pipe is equipped with a pipe body 102 wherein a mountain portion 104 having a large outer diameter and a valley portion 106 having a small outer diameter are alternately provided. With reference to a fiducial line N extending in a radial direction at a mountain shifting part S shifting from the valley portion 106 to the mountain position 104, both sides parts 104a, 104b of the mountain portion 104 extend from the mountain shifting part S toward a top portion 104c in such a way as to convexly bend outward from the fiducial line N. Both sides parts 106a, 106b of the valley portion 106 extend from a valley shifting part R toward a bottom portion 106c in such a way as to convexly bend outward from a fiducial line N.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible corrugated pipe.

[0002]

2. Description of the Related Art For example, in an apartment house 2 such as an apartment, gas appliances such as a water heater 4 are installed in each house as shown in FIG. Water heater 4 is installed on floor 6 of apartment house 2. The water heater 4 has a rectangular parallelepiped water heater body 8.
On the upper surface of the water heater main body 8, an intake connection pipe 10 and an exhaust connection pipe 12 are provided. A combustion chamber 14 is provided in the water heater main body 8, and a combustion burner 16 is provided in the combustion chamber 14, and a fuel gas, such as city gas or LP gas, is supplied to the combustion burner 16 through a supply pipe 18.
The intake connection pipe 10 supplies outside air to the combustion chamber 14 and
The combustion gas in 4 is exhausted through the exhaust connection pipe 12.

On the side of the apartment house 2, there are provided an outside air introduction pipe 20 for guiding the air outside the apartment house 2 to the water heater 4 and an external discharge pipe 22 for leading the combustion gas to the outside of the apartment house 2. . The outside air introduction pipe 20 and the outside discharge pipe 22 are generally arranged in a space between the ceiling 24 on the lower floor and the floor 26 on the upper floor, and one end thereof is located outside the apartment house 2. It opens and the other ends open above the water heater 4 to be installed.

Generally, in a new apartment house 2, the other end portions of the outside air introduction pipe 20 and the outside discharge pipe 12 are considered in consideration of the arrangement positions of the intake connection pipe 10 and the exhaust connection pipe 12 of the water heater 4 to be installed. The arrangement position is set. And the outside air introduction pipe 20
The other end of the water heater 4 is connected to the intake connection pipe 10 of the water heater 4 via an intake pipe 28, and the other end of the external discharge pipe 22 and the exhaust connection pipe 12 of the water heater 4 are connected via an exhaust pipe 30. The intake pipe 28 and the exhaust pipe 30 are connected so as to be linear.

[0005] With such a configuration, the air outside the apartment house 2 is supplied to the combustion chamber 14 of the water heater 4 through the outside air introduction pipe 20, the intake pipe 28 and the intake connection pipe 10, and the combustion chamber 14 The burned combustion gas is supplied to the exhaust connection pipe 12,
The exhaust gas is discharged to the outside of the apartment house 2 through the exhaust pipe 30 and the external discharge pipe 22. Although not shown, a heat exchanger is provided in the water heater main body 8, and heat exchange is performed between combustion gas burning in the combustion chamber 14 and water flowing in the heat exchanger to generate hot water. Generated.

[0006]

When such a water heater 4 is used for a long period of time, it has a life, and when it reaches the end of its life, it must be replaced with a new water heater 4A. At this time, if the arrangement position of the intake connection pipe 10 and the exhaust connection pipe 12 of the old water heater 4 and the arrangement position of the intake connection pipe 10A and the exhaust connection pipe 12A of the new water heater 4A are at the same position, replacement for replacement is performed. The installation work is facilitated and no particular problem arises, but on the other hand, the arrangement positions of the intake connection pipe 10 and / or the exhaust connection pipe 12 of the old water heater 4 and the intake connection pipes 10A and / or of the new water heater 4A. Alternatively, if the arrangement position of the exhaust connection pipe 12A is different, for example, as shown in FIG.
8A and the exhaust stack 30A must be connected. That is, on the intake side, the central axis P of the intake connection pipe 10A
1 and the center axis Q1 of the other end of the outside air introduction pipe 20 are deviated, so that the intake cylinder 28a is curved as required, and one end thereof is connected to the intake connection pipe 10A, and the other end is connected to the outside air introduction pipe 2.
0 must be connected to the other end. Also, on the exhaust side, the central axis P2 of the exhaust connection pipe 12A and the central axis Q2 of the other end of the external exhaust pipe 22 are displaced. It must be connected to the exhaust connection pipe 12A and the other end to the other end of the external exhaust pipe 22.

Conventionally, the intake cylinder 28 (28A) and the exhaust cylinder 3
0 (30A) uses a corrugated pipe 42 as shown in FIG. The corrugated pipe 42 has a corrugated pipe main body 4 in which peaks 44 and valleys 46 are alternately formed in the axial direction.
8, and the shapes of the peaks 44 and the valleys 46 of the tube main body 48 are formed in a sine curve shape. Such a corrugated pipe 42 has a large bending rigidity, and the intake cylinder 28 (28A)
In addition, it is not easy to bend the exhaust pipe 30 (30A) into a predetermined shape, and in connection with this, there is a problem that it is not easy to exchange a new water heater 4A, and it takes time to exchange the water heater 4A. In particular, the intake cylinder 28 (28A) and the exhaust cylinder 3
In the case of the corrugated pipe 42 having a large diameter such as 0 (30A), the bending rigidity is increased and it is not easy to bend. An object of the present invention is to provide a corrugated pipe that can be easily bent as compared with the related art.

[0008]

SUMMARY OF THE INVENTION The present invention is a corrugated pipe having a pipe body in which ridges having a large outer diameter and valleys having a small outer diameter are provided alternately. With reference to a reference line extending in the radial direction at the peak transition part transitioning to the part, one side part and / or the other side part of the peak part is higher than the reference line from the peak transition part toward the top thereof. It is characterized by extending outwardly in a curved shape.

According to the present invention, one side and / or the other side of the peak of the corrugated pipe extends from the peak transition to the top thereof outside a reference line extending radially from the peak transition. Since the convex portion is curved, the peak portion is easily bent by the presence of the convex curved portion, and the tube body can be easily curved. By providing this convex curved portion on both sides of the peak portion, the curved portion can be more easily curved. Also,
The present invention is a corrugated pipe including a pipe main body in which ridges having a large outer diameter and valleys having a small outer diameter are alternately provided, and a valley transition portion that transitions from the ridge to the valley. One side and / or the other side of the valley portion extends from the valley transition portion toward the bottom thereof so as to be convexly curved outward from the reference line with respect to a radially extending reference line. It is characterized by having.

According to the present invention, one side and / or the other side of the valley of the corrugated pipe extends from the valley transition toward the bottom thereof outside a reference line extending radially from the valley transition. Since it is curved in a convex shape, the valley portion is easily bent by the presence of such a convex curved portion, and the tube body can be easily curved. By providing this convex curved portion on both sides of the valley, it can be more easily curved. Furthermore,
The present invention is a corrugated pipe including a pipe main body in which a ridge having a large outer diameter and a valley having a small outer diameter are provided alternately, and a ridge transition portion that transitions from the valley to the ridge. On the basis of a reference line extending in the radial direction, both side portions of the crest extend in a convex shape from the crest transition portion toward the apex thereof outwardly from the reference line, and extend along the valley portion. Are characterized by extending from the valley transition portion toward the bottom thereof so as to protrude outward from the reference line.

According to the present invention, both sides of the peak of the corrugated pipe are convexly curved outward from a reference line extending in a radial direction from the peak transition from the peak transition to the top thereof. Since both sides of the trough are convexly curved outward from the reference line from the trough transition to the bottom, the entire pipe body is bent by the convex curving portion of the peak and the trough. And the tube body can be more easily curved as required.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2,
An embodiment of a corrugated pipe according to the present invention will be described. FIG. 1 is a front view showing an embodiment of a corrugated pipe according to the present invention, and FIG. 2 is a partially enlarged sectional view showing a part of the corrugated pipe of FIG.

1 and 2, a corrugated pipe 101 shown has a corrugated pipe main body 102.
In a large part of 02 (except for both ends), peaks 104 having a large outer diameter and valleys 106 having a small outer diameter are alternately provided. The corrugated pipe 101 is used as an intake pipe and an exhaust pipe of a water heater as described with reference to FIGS. 3 and 4, for example, and is made of stainless steel (for example, SUS30).
4) It is made of a metal material having corrosion resistance such as the above.

The corrugated tube 101 is configured as follows so that it can be bent relatively easily. Referring mainly to FIG.
Between the valley 106 and the valley 106, the valley 10
Looking at the 6 side, there is a valley transition R that transitions from the valley 104 to the valley 106, while looking from the valley 106 side to the valley 104 side, a valley transition that transitions from the valley 106 to the valley 104 There is a part S, and the valley transition part R and the peak transition part S are the same part.

With respect to each peak 104 of the corrugated pipe 101, with respect to a reference line M extending in the radial direction at the peak transition portion S, both side portions 104a and 104b of the peak 104 are
The ridge 104 is curved outward from the reference line M (left and right sides in FIG. 2) toward the top 104c. It has a substantially Ω shape that bulges into the shape. Further, with respect to each valley portion 106, a reference line N extending in the radial direction at the valley transition portion R (this reference line N coincides with the reference line M).
, The both sides 106a, 106b of the valley 106
Extends in a convex shape outward (left and right sides in FIG. 2) beyond the reference line N toward the bottom 106c,
By bending the valleys 10 in this manner, each valley 10
Numeral 6 has a substantially inverted Ω shape bulging in an arc shape on both sides. still,
As shown in FIG. 2, the reference line M (N) extends in the radial direction substantially perpendicular to the axial line L connecting the valley transitions R (peak transitions S).

The corrugated pipe 101 thus constructed
In this case, the peak portions 104 are easily curved by curving the both side portions 104a and 104b of each peak portion 104 outwardly, and the both side portions 106a and 106b of each valley portion 106 are bent.
Is curved outward so that the valley 106 is easily curved. Therefore, the corrugated tube 101 described above
In this case, almost the entire tube main body 102 is easily curved in relation to its shape, and can be curved with a relatively small bending force. And by using such a corrugated pipe 101 for an intake pipe and an exhaust pipe of a water heater, for example,
The replacement work of the water heater, in particular, the bending work of the intake cylinder and the exhaust cylinder becomes easy, and the construction time can be greatly reduced.

In this embodiment, both side portions 104a, 104b and a valley portion 106 of the peak portion 104 of the corrugated pipe 101 are provided.
Are bent in a convex shape on both sides, for example, both sides 104a, 104b (or 106a, 106b) of the peak 104 (or the valley 106).
May be convexly curved to both sides, and in such a configuration, the pipe main body 102 is easily bent in relation to the shape of the peak portion 104 (or the valley portion 106), and as described above, Can be curved. The corrugated pipe 101 is not necessarily provided on both sides 104a, 1
It is not necessary to bend the outer side of the valley portion 104a (or 104b) [the one side portion 106a (or 106b) of the valley portion 106]. )] Is convexly curved outwardly to achieve the desired effect.

Such a corrugated pipe 101 includes a gas supply pipe for supplying a fuel gas, a liquid supply pipe for supplying a liquid such as water and hot water, and a gas such as air in addition to an intake pipe and an exhaust pipe of a water heater. Can be widely used for gas supply pipes for supplying air. In particular, the inner diameter (the inner diameter of the bottom 106c of the valley 106)
A corrugated pipe having a large inner diameter, for example, a pipe having an inner diameter of 50 mm or more tends to be hard to bend because the strength is increased. However, such a corrugated pipe 101 having a large inner diameter can be easily bent, and the handling operation is easy. Become. Examples and Comparative Examples In order to confirm the effects of the corrugated pipe described above, the following experiments were performed. As an example, a corrugated pipe having a corrugated shape shown in FIGS. 1 and 2 was made of stainless steel (SUS30).
4) Five corrugated pipes were manufactured, and these corrugated pipes were bent and the initial force of bending was measured. Various dimensions of the corrugated tube of the example were as follows.

Overall length: 523 mm Inner diameter of valley: 60 mm Outer diameter of ridge: 68 mm Pitch of ridge: 7.0 mm Overall length of ridge: 450 mm Plate thickness: 0.3 mm Example of corrugated pipe The maximum force at the beginning of the turn is 31
50kgf ・ mm, the minimum value is 2940kgf ・ m
m, the average of the five measurements was 3020 kgf · mm.

On the other hand, as a comparative example, five corrugated pipes having a corrugated shape shown in FIG. 5 were manufactured using the same material as the example, and the force at the beginning of bending was measured in the same manner as in the example. Various dimensions of the corrugated tube of the comparative example were as follows. Hull length: 523 mm Inner diameter of valley: 60 mm Outer diameter of hill: 72 mm Pitch of hill: 7.0 mm Length of hill: 450 mm The maximum force at the beginning of bending of the corrugated pipe of the comparative example is 45.
00kgf ・ mm, the minimum value is 4320kgf ・ m
m, the average of the five measurements was 4430 kgf · mm.

As is clear from the results of the above-described Examples and Comparative Examples, the side portions of the peaks and valleys of the corrugated pipe are bent outwardly in a convex shape, so that the corrugated pipe becomes extremely easy to bend, and the force required for bending is also reduced. It was confirmed from the experimental results that about 2/3 was sufficient.

[0022]

According to the corrugated pipe of the first aspect of the present invention, one side portion and / or the other side portion of the peak portion is outwardly curved from the peak transition portion toward the top portion. Therefore, the convex portion is easily bent by the presence of the convex curved portion, and the pipe main body can be easily curved.

According to the corrugated pipe of the second aspect of the present invention, one side and / or the other side of the valley is curved outwardly from the valley transition toward the bottom. So
Due to the presence of the convex curved portion, the valley portion is easily bent, and the tube body can be easily curved.

Further, according to the corrugated pipe of the third aspect of the present invention, since both sides of the peak and the valley are curved outwardly convex, the convex curved portion of the peak and the valley is provided. As a result, the entire pipe body is easily bent, and can be easily bent as required.

[Brief description of the drawings]

FIG. 1 is a front view schematically showing an embodiment of a corrugated pipe according to the present invention.

FIG. 2 is a partially enlarged sectional view showing a part of the corrugated pipe of FIG. 1 in an enlarged manner.

FIG. 3 is a simplified cross-sectional view for explaining an installation state of a water heater.

FIG. 4 is a simplified cross-sectional view for explaining an installation state of the water heater when the water heater is replaced with a new water heater.

FIG. 5 is a partially enlarged sectional view showing a part of a conventional corrugated pipe in an enlarged manner.

[Explanation of symbols]

 4,4A water heater 10, 10A Intake connection pipe 12, 12A Exhaust connection pipe 28, 28A Intake cylinder 30, 30A Exhaust cylinder 101 Corrugated pipe 102 Pipe main body 104 Mountain part 104a, 104b Mountain side part 104c Mountain top 106 Valley 106a, 106b Valley side 106c Valley bottom M, N Reference line R Valley transition S Mountain transition

Continued on the front page (72) Inventor Seisuke Muraoka 24 Fukushima 3-chome 4-35-402 Nishi-ku, Sapporo-shi, Hokkaido F-term (reference) 3H111 AA03 BA03 CA42 CB14 CB21 DB11 DB27

Claims (3)

[Claims] 1. A corrugated pipe provided with a pipe main body in which ridges having a large outer diameter and valleys having a small outer diameter are alternately provided, wherein a corrugated pipe transitioning from the valley to the ridge is provided. And one side of the crest and / or
Alternatively, the corrugated tube is characterized in that the other side portion extends from the mountain transition portion toward the top portion thereof so as to be convexly curved outward from the reference line. 2. A corrugated pipe comprising a pipe main body in which ridges having a large outer diameter and valleys having a small outer diameter are provided alternately, wherein a valley transition portion transitioning from the ridge to the valley is provided. And one side of the valley and / or
Alternatively, the corrugated tube is characterized in that the other side portion extends from the valley transition portion toward the bottom so as to be convexly curved outward from the reference line. 3. A corrugated pipe provided with a pipe main body in which ridges having a large outer diameter and valleys having a small outer diameter are provided alternately, wherein a corrugated pipe transitioning from the valley to the ridge is provided. On the basis of a reference line extending in the radial direction, both side portions of the crest portion extend from the crest transition portion toward the top portion in a convexly curved shape outside the reference line, and the valleys. A corrugated pipe characterized in that both side portions of the portion extend from the valley transition portion toward the bottom so as to be convexly curved outside the reference line.