TW201937098A - A composite tube - Google Patents

Abstract

A composite tube includes: a tubular pipe body; an overlaying layer composed of a resin material, being tubular and covering the periphery of the pipe body, in which an annular mountain portion outwardly protruded towards a radial direction and an annular valley portion recessed on the outside of the radial direction are formed alternately in an axial direction of the pipe body so as to contract along the axial direction in a bellows shape; and retaining mechanisms extendedly disposed along either the peripheral direction or axial direction of the overlaying layer and separated along by the other in a plural manner with an interval so that the pipe body is retained within the overlaying layer.

Description

 Composite pipe  

The present disclosure relates to a composite pipe.

Conventionally, a composite pipe in which a plurality of layers of a pipe body are stacked is known. For example, Japanese Laid-Open Patent Publication No. 2013-231490 discloses a composite pipe in which a protective layer is formed between a pipe body and a holding layer covering the outer periphery of the pipe.

The composite pipe shown in Japanese Laid-Open Patent Publication No. 2013-231490 is provided with a protective layer to hold the pipe body inside the holding layer. Further, the inner peripheral surface of the protective layer is provided with irregularities to reduce the frictional resistance between the outer peripheral surface of the tubular body and the protective layer. Thereby, when the holding layer and the protective layer are pulled in the axial direction of the tube body in order to connect the pipe body to the pipe joint, the pipe body end portion is easily exposed. However, since the protective layer covers the outer peripheral surface of the tubular body, it may become an impedance when the protective layer is stretched and stretched, and there is a possibility that it is difficult to expand and contract.

The present disclosure provides a composite pipe that retains the tubular body inside the cladding layer and allows the coating layer to be easily stretched.

The composite pipe of the first aspect has a tubular pipe body; a coating layer composed of a resin material, which is tubular and covers the outer circumference of the pipe body, and is formed in the axial direction of the pipe body: a convex annular mountain portion; and a radially inner annular portion which is concave in the radial direction, and which has a bellows shape which can be contracted in the axial direction; and a holding mechanism which is along the periphery of the coating layer or Either of the axial directions are extended, and are arranged in a plurality of intervals along the other, and the tubular body is held inside the cladding layer.

According to the composite tube of the first aspect, the tube system is held inside the coating layer by the holding mechanism. The holding mechanism is extended along the circumference of the coating layer, and is disposed in plural intervals along the axial direction. Or it may extend along the axial direction of the coating layer, and may be arranged in plural intervals along the surrounding direction.

Therefore, the friction between the tube body and the holding mechanism is compared to the holding mechanism that extends along both the circumferential direction and the axial direction of the coating layer (in other words, the holding mechanism covering the outer circumference of the tube), or The friction between the coating and the holding mechanism will be small. Therefore, the coating layer is easily stretched in the axial direction.

The composite pipe according to the second aspect is the composite pipe of the first aspect, and the holding mechanism is a reduced diameter portion in which the valley portion protrudes inward in the radial direction.

In the composite tube of the second aspect, the valley portion of the coating layer protrudes inward in the radial direction, and the reduced diameter portion is formed. Then, the tubular body is held inside the coating layer by the reduced diameter portion. The reduced diameter portion can be actuated in the axial direction along with the expansion and contraction of the coating layer. Further, the reduced diameter portions are arranged at intervals in the axial direction. Therefore, the contact area between the cladding layer and the tube body is small, and the frictional force is small. Thereby, the coating layer is easily stretched.

The composite pipe of the third aspect is the composite pipe of the first aspect, and the holding mechanism is an elastic body disposed between the valley portion and the pipe body in the axial direction.

The composite pipe of the third aspect is disposed between the valley portion of the coating layer and the pipe body, and an elastic body is disposed along the axial direction. Further, the elastic body is disposed at intervals in the surrounding direction. Therefore, the contact area of the coating layer with the elastic body is small and the frictional force is small. Thereby, the coating layer is easily stretched.

The composite tube of the fourth aspect is in the composite tube of the first aspect, and the elastic system is formed in a wave shape with an amplitude in a direction around the coating layer.

In the composite tube of the fourth aspect, the elastic body extending along the axial direction of the coating layer has an amplitude in the direction around the coating layer. Therefore, the elastic body is easily deformed in the axial direction. Thereby, the coating layer is more easily stretched.

According to the present disclosure, it is possible to provide a composite pipe which can hold the pipe body inside the coating layer and make the coating layer easy to expand and contract.

10‧‧‧Composite tube

12‧‧‧ tube body

12A‧‧‧ outer perimeter

14‧‧‧Intermediate

20‧‧‧coating

22‧‧‧Mountain

22A‧‧‧Outer side wall

22B‧‧‧ side wall

22C‧‧‧Outer bending

24‧‧‧ Valley Department

24A‧‧‧ inner side wall

24B‧‧‧ side wall

24C‧‧‧Inside bending

26‧‧‧Reducing section

26A‧‧‧ inner side wall

30‧‧‧ Elastomers

40‧‧‧ Elastomers

H1‧‧‧ thickness

H2‧‧‧ thickness

L1‧‧‧ length

L2‧‧‧ length

M‧‧‧Intermediate

R‧‧‧ radial

△R‧‧‧radius difference

S‧‧‧ axial

V‧‧‧Air Storage Department

Fig. 1 is a perspective view showing a composite pipe according to an embodiment of the present disclosure.

Fig. 2 is a longitudinal sectional view showing a composite pipe according to an embodiment of the present disclosure.

Fig. 3 is an enlarged partial cross-sectional view showing a composite pipe according to an embodiment of the present disclosure.

Fig. 4A is a perspective view showing a modification of the holding mechanism in the composite pipe according to the embodiment of the present disclosure.

Fig. 4B is a perspective view showing a state in which the end portion of the tubular body of the composite pipe of Fig. 4A is exposed.

Fig. 4C is a perspective view showing a state in which the deformation of the coating layer is shortened and the elastic body is also shortened.

Fig. 5 is a vertical cross-sectional view showing a state in which a tubular body end portion of the composite pipe according to the embodiment of the present invention is exposed.

Fig. 6 is a view showing a process of shortening the deformation of the coating layer in the longitudinal section of Fig. 3.

Fig. 7 is a view showing a state in which the coating layer is shortened and deformed in the longitudinal section of Fig. 3.

Fig. 8 is a perspective view showing a state in which the end portion of the tubular body of the composite pipe according to the embodiment of the present invention is exposed.

Fig. 9A is a perspective view showing a modification of the holding mechanism in the composite pipe according to the embodiment of the present disclosure.

Fig. 9B is a perspective view showing a state in which the end portion of the tubular body of the composite pipe of Fig. 9A is exposed.

Fig. 9C is a perspective view showing a state in which the deformation of the coating layer is shortened and the elastic body is also shortened.

Fig. 10 is a longitudinal sectional view showing a composite pipe relating to a comparative example.

Hereinafter, the embodiment of the composite pipe according to the present disclosure will be described in detail with reference to the drawings as appropriate. The constituent elements denoted by the same reference numerals in the respective drawings represent the same constituent elements. Further, each component is not limited to one, but may be plural. In addition, the description of the configuration and the symbols which are repeated in the embodiments described below will be omitted. Further, the present disclosure is not limited to the following embodiments, and may be implemented by adding appropriate modifications within the scope of the gist of the present disclosure.

The term "process" in this specification does not refer to an independent process. Even if it is not clearly distinguishable from other processes, this process is also included in this term as long as it can achieve its purpose. In the present specification, the amount of each component in the composition may be present in the composition in a plurality of substances as the components, and unless otherwise specified, represents the total amount of the plurality of substances present in the composition. The term "principal component" as used in this specification means a component having the highest mass reference content in the mixture unless otherwise specified.

<composite tube>

The composite pipe system disclosed in the present disclosure has a tubular pipe body, a coating layer which is tubular and covers the outer circumference of the pipe, and a holding mechanism for holding the pipe body inside the coating layer. The tube system is composed of a resin material. The coating layer is made of a resin material. Further, the shape is such that an annular mountain portion which is convex toward the outside in the radial direction and an annular valley portion which is concave toward the outside in the radial direction are formed in the axial direction of the tubular body, and are formed in a bellows shape and are in the tube. The outer circumference is guided and can be shortened in the axial direction. The holding mechanism is integrally formed with the covering layer.

Next, an example will be given and the form of the composite pipe used in the present disclosure will be described based on the drawings. The composite pipe 10 according to the present embodiment shown in FIG. 1 includes a pipe body 12 and a coating layer 20.

(tube body)

The tubular body 12 is tubular and is a resin tube composed of a resin material. The resin of the resin material is, for example, a polyolefin such as polybutene, polyethylene, cross-linked polyethylene or polypropylene, or vinyl chloride. The resin may be used alone or in combination of two or more. Among them, polybutene is preferably used, and polybutene is preferably contained as a main component, and may be, for example, a state in which the resin material constituting the tubular body contains 85% by mass. Further, the resin material constituting the tube body may contain other additives.

The diameter (i.e., the outer diameter) of the tubular body 12 is not particularly limited, and may be, for example, in the range of 10 mm or more and 100 mm or less, preferably in the range of 12 mm or more and 35 mm or less. Further, the thickness of the tubular body 12 is not particularly limited, and may be, for example, 1.0 mm or more and 5.0 mm or less, preferably 1.4 mm or more and 3.2 mm or less.

(cladding layer)

The cladding layer 20 is tubular and covers the outer circumference of the tubular body 12. The coating layer 20 is made of a resin material. The resin constituting the resin material of the coating layer 20 is, for example, a polyolefin such as polybutene, polyethylene, cross-linked polyethylene or polypropylene, or vinyl chloride. The resin may be used alone or in combination of two or more. Among them, a low-density polyethylene is preferably used, and a low-density polyethylene is preferably contained as a main component, and for example, it may be contained in a resin material constituting the coating layer in an amount of 80% by mass or more, and more preferably Contains 90% by mass or more.

Further, the MFR (Melt Flow Rate) of the resin to be used is preferably 0.25 or more, more preferably 0.3 or more, and most preferably 0.4 or more and 1.2 or less. By setting the MFR to 1.2 or less, it is possible to make the burrs difficult to produce. In the case where the MFR is larger than 1.2, the molten resin is easily allowed to flow into the parting surface of the mold for forming the coating layer 20, and burrs are easily generated. Further, the resin material constituting the coating layer may contain other additives.

As shown in Fig. 2, the coating layer 20 is bellows-shaped, and an annular mountain portion 22 which is convex toward the radially outer side and which is concave toward the radially outer side is continuously formed alternately in the axial direction S of the tubular body 12. The annular valley 24 . The mountain portion 22 is disposed on the outer side of the radial direction R from the valley portion 24. As shown in Fig. 3, when the radially outer portion of the bellows shape of the coating layer 20 is the outer side wall 22A and the radially inner side portion is the inner side wall 24A, the outer side of the radial direction can be used. The intermediate portion M of the wall 22A and the inner side wall 24A serves as a boundary, and the radially outer side is the mountain portion 22, and the radially inner side is the valley portion 24.

The mountain portion 22 has a side wall 22B extending in the axial direction S (see FIG. 2) and a side wall 22B extending from both ends of the outer side wall 22A in the radial direction R. An outer curved portion 22C is formed between the outer side wall 22A and the side wall 22B. The valley portion 24 has a side wall 24A extending in the axial direction S and a side wall 24B extending from both ends of the inner side wall 24A in the radial direction R. An inner curved portion 24C is formed between the inner side wall 24A and the side wall 24B.

Further, although not particularly limited, the length L1 of the axial direction S of the mountain portion 22 is preferably set to be longer than the length L2 of the axial direction S of the valley portion 24. The length L1 is preferably 1.2 times or more the length L2 in order to ensure the ease of deformation of the outer side wall 22A when the following deformation is shortened.

Further, the length L2 is preferably 0.8 mm or more. When the length L2 is less than 0.8 mm, the width of the valley portion of the mold for producing the coating layer 20 is too small. As a result, when the coating layer 20 is produced, after the resin constituting the coating layer 20 is pushed out, and the resin is provided with irregularities by a mold, the portion corresponding to the valley portion of the resin mold is changed. Fine and easy to damage. Therefore, the coating layer 20 is difficult to form. On the other hand, the length L1 is preferably 5 times or less the length L2. This is because the flexibility of the composite pipe 10 can be maintained by making the length L1 five times or less the length L2. Moreover, when the length L1 is too long, when the composite pipe 10 is laid, it becomes difficult to apply because the contact area with the ground becomes large.

Further, as shown in FIG. 3, the length L1 is a distance between the outer side of the axial direction S of the surface from the outer side of the radial direction R of the cladding layer 20 in the portion intersecting the intermediate portion M of the cladding layer 20 (also That is, the distance between the surface on the one side in the axial direction S of the convex portion of the coating layer 20 on the outer side in the radial direction R and the surface on the other side in the axial direction S). Further, the length L2 is a distance between the outer side of the axial direction S of the surface from the inner side of the radial direction R of the cladding layer 20 in the portion intersecting the intermediate portion M of the cladding layer 20 (that is, at the cladding layer 20). The inner side of the radial direction R is a convex portion, and the distance between the surface on the one side in the axial direction S and the surface on the other side in the axial direction S).

The thickness of the coating layer 20 is preferably 0.1 mm or more for the thinnest portion and 0.4 mm or less for the thickest portion in order to shorten the coating layer 20. The thickness H1 of the outer side wall 22A is thinner than the thickness of the inner side wall 24A. The thickness H1 is preferably 0.9 times or less the thickness H2 in order to ensure the ease of deformation of the outer side wall 22A at the time of shortening the deformation described below.

The difference in radius ΔR between the mountain portion 22 and the valley portion 24 on the outer surface is preferably equal to or less than 800% of the thickness of the coating layer 20. If the radius difference ΔR is too large, even if the portion of the mountain portion 22 along the axial direction S is not deformed, it is difficult to cause the valley portion 24 to bulge outward in the radial direction when shortening, or to prevent the adjacent mountain portions 22 from being mutually inclined. Close to and become a distorted state of deformation. When the radius difference ΔR is 800% or less of the thickness of the coating layer 20, in order to suppress the deformation state, it is preferable that the axial length S of the mountain portion 22 is longer than the axial length of the valley portion 24. Further, it is more preferable that the radius difference ΔR is 600% or less of the thickness of the overcoat layer 20.

The diameter of the coating layer 20 (that is, the outermost outer diameter) is not particularly limited and may be, for example, in the range of 13 mm or more and 130 mm or less.

(holding institution)

As shown in FIG. 2, the cover layer 20 is partially formed with a reduced diameter portion 26 as a holding means for holding the tubular body 12. The reduced diameter portion 26 is an annular support body in which the valley portion 24 is formed to protrude inward in the radial direction, and is extended along the peripheral direction of the cover layer 20. The reduced diameter portion 26 is provided in plural along the axial direction of the cladding layer 20 at intervals. In the present embodiment, for example, the three valley portions 24 and the one reduced diameter portion 26 of the non-reduced diameter portion 26 are arranged alternately in the axial direction.

As shown in FIG. 3, the radius of the inner side wall 26A of the reduced diameter portion 26 substantially coincides with the radius of the outer peripheral surface 12A of the tubular body 12. Thereby, the tubular body 12 is held inside the cladding layer 20 by the reduced diameter portion 26. Further, the "substantially identical" aspect is as shown by a two-dot chain line, and includes a radius of the inner side wall 26A of the reduced diameter portion 26 in a state of being deformed radially outward, and a radius of the outer peripheral surface 12A of the tubular body 12. Will be consistent. Further, the radius of the inner side wall 26A of the reduced diameter portion 26 is slightly larger than the radius of the outer peripheral surface 12A of the tubular body 12, and a gap is formed between the inner side wall 26A and the outer peripheral surface 12A.

(action)

When the composite pipe 10 according to the present embodiment is connected to the joint, the force of the direction in which the pipe body 12 is exposed is applied to the coating layer 20 in the state shown in Fig. 2, and the coating layer 20 is shortened in the axial direction S. . As a result, as shown in FIG. 5, the coating layer 20 at one end portion is held in the direction in which the tubular body 12 is exposed while being held by the reduced diameter portion 26.

As described above, according to the composite pipe 10 of the present embodiment, the pipe body 10 is held inside the cladding layer 20 by the reduced diameter portion 26. The reduced diameter portion 26 is extended along the circumferential direction of the cover layer 20. Therefore, the tube body 12 can be surely held. By holding the pipe body 12, even in the case of a water hammer phenomenon caused by, for example, a liquid flowing inside the pipe body 12, it is possible to suppress the vibration of the pipe body 12 and suppress the generation of noise.

Further, the reduced diameter portion 26 is movable in the axial direction in accordance with the expansion and contraction of the covering layer 20. Since the reduced diameter portions 26 are arranged at intervals in the axial direction, the contact area with the tubular body 12 is small. Therefore, the cover layer 20 can be easily stretched.

On the other hand, for example, the holding mechanism (intermediate layer 14) related to the comparative example shown in FIG. 10 is extended along both the circumferential direction and the axial direction of the coating layer 20. In other words, the intermediate layer 14 covers the entirety of the outer circumference of the tubular body 12. Therefore, the contact area between the intermediate layer 14 and the tubular body 12 is larger than the contact area between the reduced diameter portion 26 and the tubular body 12 of the present embodiment. Therefore, in the comparative example, when the coating layer 20 is stretched and contracted, a large frictional force acts between the tubular body 12 and the intermediate layer 14, and there is a possibility of becoming a resistance. Further, since the intermediate layer 14 is disposed on the entire outer circumference of the tubular body 12, the rigidity is likely to be high when it is intended to be shortened in the axial direction, and it is difficult to deform, and the coating layer 20 may be difficult to expand and contract.

Further, according to the composite pipe 10 according to the present embodiment, as shown in FIG. 3, the reduced diameter portion 26 is formed such that the valley portion 24 protrudes inward in the radial direction. Therefore, an air storage portion V is formed between the inner side wall 24A of the valley portion 24 and the outer peripheral surface 12A of the tubular body 12. In other words, the tubular body 12 is covered by the air storage portion V. Therefore, the heat retention of the pipe body 12 can be ensured.

Further, in the outer side wall 22A of the mountain portion 22 and the inner side wall 24A of the valley portion 24, preferably, the length L1 of the axial direction S is longer than the length L2, and the thickness H1 is thinner than the thickness H2. Thereby, the outer side wall 22A is more easily deformed than the inner side wall 24A, and as shown in Fig. 6, it is deformed so as to bulge outward in the radial direction. Next, as shown in FIG. 7, the curved portion 22C outside the mountain portion 22 and the curved portion 24C inside the valley portion 24 are deformed so that the adjacent mountain portions 22 are close to each other.

As a result, as shown in FIG. 5, one end of the covering layer 20 is more likely to move in a direction in which the tubular body 12 is exposed. In this manner, when the coating layer 20 is shortened, the outer side wall 22A is deformed so as to bulge. Thereby, even if the bending angle or thickness of the coating layer 20 is slightly uneven, it is possible to suppress the valley portion 24 from bulging outward in the radial direction, or to make the adjacent mountain portions 22 not close to each other and become distorted. Deformation state. Thereby, it is possible to suppress deterioration of the appearance of the shortened coating layer 20.

Further, in the present embodiment, the thickness H1 of the outer side wall 22A is made thinner than the thickness H2 of the inner side wall 24A, but the thickness H1 may be the same as the thickness H2.

Further, in the present embodiment, the outer side wall 22A has a substantially linear shape along the axial direction S, but may be an arc shape that bulges outward in the radial direction. Further, regarding the inner side wall 24A, it may be an arc shape that bulges radially inward. Further, the inner side wall 26A of the reduced diameter portion 26 may have a shape that bulges inward in the radial direction. Thereby, the covering layer 20 can be more easily stretched and contracted.

Further, in the present embodiment, the reduced diameter portion 26 that deforms the valley portion 24 of the coating layer 20 is used as a holding mechanism for holding the tubular body 12 inside the coating layer 20. In this manner, the number of components is reduced by integrating the holding mechanism with the cover layer 20. Thereby, the composite pipe can be easily manufactured.

In addition, the holding mechanism can be additionally constructed with the cover layer 20. For example, as shown in FIG. 4A, a resin elastic body 30 formed in a rod shape (for example, a columnar shape) may be disposed between the coating layer 20 and the tubular body 12. The elastic body 30 is extended along the axial direction of the coating layer 20, and is disposed at a plurality of intervals along the circumferential direction of the coating layer 20. In the present embodiment, a total of four are arranged every 90 degrees in the circumferential direction, but any number may be arranged. For example, a total of three may be arranged every 120 degrees. However, in order to secure the holding force of the tubular body 12, the elastic body 30 is preferably provided in three or more.

The elastic body 30 is interposed between the outer circumferential surface 12A of the tubular body 12 and the inner side wall 24A of the valley portion 24 of the coating layer 20. Thereby, the tubular body 12 is held inside the cladding layer 20.

The resin constituting the elastic body 30 may, for example, be a polyurethane, a polystyrene, a polyethylene, a polypropylene, an ethylene propylene diene rubber, a ruthenium rubber, or a mixture of the resins, and among them, a ruthenium rubber is preferable. Alternatively, a coil or the like that can expand and contract along the axial direction of the coating layer 20 can also be used. Further, in the present embodiment, the elastomer 30 is a rubber tube made of ethylene propylene diene monomer.

According to the composite pipe using the elastic body 30, the rod-shaped elastic body 30 is extended between the coating layer 20 and the pipe body 12 along the axial direction of the coating layer 20. Therefore, in the case where the coating layer 20 is to be expanded and contracted, the coating layer 20 and the elastic body are provided in a comparative example in which the intermediate layer 14 shown in FIG. 10 is disposed between the coating layer 20 and the tubular body 12, for example. The friction generated between 30 will be small. Therefore, as shown in Fig. 4B, the covering layer 20 is easily stretched.

Further, when the elastic body 30 is fixed to the inner side wall 24A of the valley portion 24 of the coating layer 20, as shown in Fig. 4C, the elastic body 30 is elastically deformed accompanying the expansion and contraction of the coating layer 20. Case. Even in this case, compared with the comparative example of Fig. 10, since the frictional force generated between the elastic body 30 and the tubular body 12 is small, the covering layer 20 is easily stretched.

Further, as shown in FIG. 9A, a resin elastic body 40 formed in a wave shape may be disposed between the coating layer 20 and the tubular body 12. The elastic body 40 is extended along the axial direction of the coating layer 20, and has an amplitude in the peripheral direction and is formed in a wave shape. Further, the elastic body 40 is disposed at a plurality of intervals along the circumferential direction of the coating layer 20. In the present embodiment, a total of four are arranged every 90 degrees in the peripheral direction. Further, the resin constituting the elastic body 40 can be the same as the resin constituting the elastic body 30.

According to the composite pipe provided with the elastic body 40, in the case where the coating layer 20 is to be expanded and contracted, compared with, for example, the intermediate layer 14 shown in Fig. 10 is disposed between the coating layer 20 and the pipe body 12, The friction generated between layer 20 and elastomer 40 will be less. Therefore, as shown in Fig. 9B, the covering layer 20 is easily stretched.

Further, as shown in FIG. 9C, the elastic body 40 may be elastically deformed accompanying the expansion and contraction of the coating layer 20. Even in this case, compared with the comparative example of Fig. 10, since the frictional force generated between the elastic body 40 and the tubular body 12 is small, the covering layer 20 is easily stretched. Further, since the elastic body 40 itself can be deformed in the axial direction with a wave interval, the coating layer 20 is more easily deformed.

Claims (4)

 A composite pipe has a tubular pipe body and a coating layer composed of a resin material, which is tubular and covers the outer circumference of the pipe body, and is formed in the axial direction of the pipe body to be convex toward the outer side in the radial direction. a ring-shaped mountain portion; and a ring-shaped valley portion which is concave in the radial direction, and has a bellows shape which can be contracted in the axial direction; and a holding mechanism which is along the circumferential direction or the axial direction of the coating layer Either the extension is arranged and will be arranged in a plurality of intervals along the other, while the tube is held inside the cladding layer.    The composite pipe according to claim 1, wherein the holding mechanism is a reduced diameter portion in which the valley portion protrudes inward in the radial direction.    A composite pipe according to claim 1, wherein the holding mechanism is an elastic body disposed between the valley portion and the pipe body in the axial direction.    The composite pipe of claim 3, wherein the elastic system is formed in a wave shape with an amplitude in a direction around the coating layer.