阅读说明：本技术 具有改善的耐久性和回复力的复合软管 (Composite hose with improved durability and restoring force ) 是由 金璟一 金熙振 黄永日 于 2018-06-12 设计创作，主要内容包括：公开了一种具有改善的耐久性和回复力的复合软管。根据本发明的复合软管具有以包围螺旋缠绕的内部线材的形式形成的涂层,并且在涂层的位于彼此相邻的内部线材之间的区域中设置有带条。另外,带条朝向涂层的中心支撑涂层。因此,因为防止了涂层的纵向伸展,所以防止了内部线材的面对涂层中心的表面与涂层的内表面位于同一条线上,从而防止了内部线材与涂层分离,使得能够改善复合软管的耐久性。另外,作为抗拉强度测试的结果,根据本实施方式的复合软管显示出比传统复合软管更大的弹力,从而具有优异的可回复性。(A composite hose according to the present invention has a coating layer formed in a form of surrounding spirally wound inner wires, and strips are provided in regions of the coating layer between the inner wires adjacent to each other, and in addition, the strips support the coating layer toward the center of the coating layer, and thus, because longitudinal extension of the coating layer is prevented, surfaces of the inner wires facing the center of the coating layer are prevented from being located on the same lines as inner surfaces of the coating layer, thereby preventing the inner wires from being separated from the coating layer, so that durability of the composite hose can be improved.)

1, A composite hose, the composite hose comprising:

a helically wound inner wire;

a coating formed around the inner wire; and

an outer wire spirally wound around an outer circumference of the coating layer,

wherein the coating comprises a strip helically wound between the inner wires adjacent to each other and supporting the coating towards the centre of the coating, i.e. outwards from the inside of the composite hose.

2. The composite hose of claim 1, wherein the coating further comprises:

an inner cover layer formed to surround the inner wire;

a reinforcing layer formed to surround the inner cover layer; and

an outer cover layer formed to surround the reinforcing layer, the outer wire being wound around the outer cover layer, and

the strap is formed to surround the inner cover layer.

3. The composite hose of claim 1, wherein the pitch of the inner wires is 29 to 31mm, and the width of the strip is 15 to 17mm, and the thickness of the strip is 0.7 to 0.9 mm.

4. The composite hose of claim 1 wherein the tape strip is formed of a polyamide fabric.

5. The composite hose of claim 1, wherein the outer wires are formed at positions corresponding to positions of the tape strips.

Technical Field

The present application is based on the benefit of priority claim of korean patent application No. 10-2017-0074589 filed on 14.6.2017, which is incorporated herein by reference in its entirety.

The present invention relates to composite hoses having improved durability and restoring force.

Background

When loading or unloading liquid cargo, such as petrochemicals, into or from a ship, an easy-to-use hose product is generally used. In particular, natural gas and petroleum gas are bulky because they are usually in a gaseous state. Therefore, after natural gas and petroleum gas are liquefied to be converted into liquefied natural gas and liquefied petroleum gas in a liquid state having a small volume, they are stored in a storage tank of a ship to be transported to a destination. At the destination, the lng and lpg are regasified for use as fuel.

Composite hoses are used to transport fluid cargo such as liquefied natural gas and liquefied petroleum gas. The composite hose should be rigid so that it can be used under high pressure conditions, while also being flexible so that it can be wound for storage.

Fig. 1 is a view showing an internal structure of a conventional composite hose disclosed in korean patent laid-open publication No. 10-0274059 (12/15/2000).

Referring to fig. 1, a conventional composite hose 10 includes: an inner spiral ring 2, the inner spiral ring 2 being formed to have a triangular cross-section and spirally wound; an inner layer 4, the inner layer 4 being formed around the inner helical ring 2; a laminate 3, the laminate 3 being formed so as to surround the inner layer 4 and being made of a synthetic resin material; an outer layer 5, the outer layer 5 being formed so as to surround the laminate 3; and an outer spiral ring 1, the outer spiral ring 1 being spirally wound around an outer circumference of the outer layer 5 and having a circular cross section. The fluid passes through the interior of the inner layer 4.

When a fluid flows into the composite hose 10 under strong pressure, friction is generated between the fluid and the inner spiral ring 2. The pitch of the inner helical ring 2 arranged at regular intervals may be different at each region due to continuous friction with the fluid. That is, the pitch of the inner helical ring 2 may be widened in some regions, and the pitch of the inner helical ring 2 may be narrowed in other local regions. The inner helical ring 2 supports the inner layer 4, the outer layer 5 and the outer helical ring 1 wound thereon. If the pitch of the inner helical ring 2 becomes wider, the inner layer 4 and the outer layer 5 are depressed, resulting in damage to the hose.

In addition, in a working environment for transporting natural gas or the like, the composite hose 10 may be repeatedly bent and stretched by a worker. If the pitch of the inner helical ring 2 is not uniform, frequent bending and stretching may cause the pitch of the inner helical ring 2 to be easily widened, and thus the composite hose 10 may be dented and damaged. Damage to the composite hose 10 may result in leakage of combustible fluid flowing therein and may result in a significant life event from an explosion in the event of a fire.

Korean patent laid-open publication No. 10-0274059 uses a triangular inner helical ring 2 to maintain the pitch of the inner helical ring 2 uniform. That is, if the triangular inner spiral ring 2 is used, the inner spiral ring 2 and the inner layer 4 forming the inner surface for fluid flow become flat, thereby minimizing the variation in the pitch of the inner spiral ring 2, and thus improving reliability.

However, the triangular inner coil loop of korean patent publication No. 10-0274059 has a problem in that the spiral of the inner coil loop may be slightly rotated due to repeated bending and stretching in a working environment, so that the hose receives greater friction when fluid flows therein, thereby causing a change in the pitch of the inner coil loop. Furthermore, the triangular inner helical ring may lead to damage to the inner layer 4 in the edge region of the inner layer 4.

Disclosure of Invention

Technical problem

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and the present invention is directed to composite hoses.

Further, the present invention provides composite hoses having improved durability and restoring force.

Technical scheme

In order to achieve the above object, the present invention provides a composite hose including spirally wound inner wires, a coating layer formed to surround the inner wires, and outer wires spirally wound around an outer circumference of the coating layer, wherein the coating layer includes a strip spirally wound between the inner wires adjacent to each other and supporting the coating layer toward a center of the coating layer (outward from an inside of the composite hose).

Advantageous effects

Accordingly, because longitudinal extension of the coating layer is prevented, the surfaces of the inner wires facing the center of the coating layer are prevented from being located on the same lines as the inner surfaces of the coating layer, thereby preventing the inner wires from being separated from the coating layer, enabling the durability of the composite hose to be improved.

In addition, the results of the tensile strength test showed that the composite hose according to the present embodiment has a greater elastic force than the conventional composite hose, thereby having excellent restorability.

Drawings

Fig. 1 is a view illustrating a conventional composite hose.

Fig. 2 is a perspective view of a composite hose according to an embodiment of the present invention.

Fig. 3 is a side sectional view of fig. 2.

Fig. 4 is an enlarged view illustrating a portion "P" of fig. 3.

Fig. 5 is a partially exploded perspective view of a manufacturing apparatus for manufacturing a composite hose according to an embodiment of the present invention.

Fig. 6 and 7 show a state where the manufacturing apparatus shown in fig. 5 is unfolded, and are a front sectional view and a plan sectional view of fig. 5.

Fig. 8 and 9 show a state in which the manufacturing apparatus shown in fig. 5 is contracted, and are a front sectional view and a plan sectional view of fig. 5.

Detailed Description

It should be noted that in different figures, the same reference numerals are used to identify the same elements.

Meanwhile, the meanings of the terms described herein should be understood as follows.

As used herein, the singular forms "" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise the ordinal numbers "", "second", etc. are used only to distinguish components from another components and are not intended to limit the scope of the invention.

It will be understood that the terms "comprises" or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

For example, "at least of the , second, and third entries" refers to the , second, and third entries and all combinations that may be given from two or more of the , second, and third entries.

For example, "a th item, a second item, and a third item" refers to the th item, the second item, and the third item, and all combinations that may be given from two or more of the th item, the second item, and the third item.

Also, when the expression " elements are directly connected or mounted to the other elements" is used herein, it is understood that there are no intervening elements between them.

Hereinafter, a composite hose having improved durability and restoring force according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 is a perspective view of a composite hose according to an embodiment of the present invention, fig. 3 is a side sectional view of fig. 2, and fig. 4 is an enlarged view illustrating a portion "P" of fig. 3.

As shown in the drawings, the composite hose 100 according to the present embodiment may be used to transport fluid cargo such as liquefied natural gas or liquefied petroleum gas. Since the composite hose 100 according to the present embodiment should be used under high pressure conditions and wound for storage, the hose should be rigid and at the same time flexible to allow it to be repeatedly bent and stretched by a worker.

To this end, the composite hose 100 according to the present embodiment may include an inner wire 110, a coating layer 130, and an outer wire 150.

The inner wire 110 may be spirally wound and may be used as an inner core of the composite hose 100 according to the present embodiment. The inner wire 110 may be spirally wound around the outer circumference of the cover 270 (see fig. 5 to 9) of the manufacturing apparatus 200 to maintain the shape thereof, and may be formed of a carbon fiber material, a synthetic resin material, or a metal material.

The coating layer 130 may be formed to surround the inner wire 110, and may include an inner cover layer 131, a reinforcement layer 133, and an outer cover layer 135.

In detail, the inner cover 131 may be formed to surround the inner wires 110, and may be formed of a film, fabric, or the like of a synthetic resin material. The inner cover 131 may have impermeability to prevent fluid penetration and may have fire resistance to resist fire.

The reinforcing layer 133 may be formed to surround the inner cover 131, and may make the composite hose 100 according to the present embodiment both rigid and malleable. In addition, the reinforcing layer 133 may be formed of a fabric.

The outer cover 135 may be formed to surround the reinforcing layer 133, and may be formed of a synthetic resin material or a rubber material. The outer cover 135 may be used as a cover of the composite hose 100 according to the present embodiment.

The external wire 150 may be spirally wound around the outer cover 135, and may be formed of a carbon fiber material, a synthetic resin material, or a metal material. The outer wire 150 may be used as an outer core of the composite hose 100 according to the present embodiment.

Because each of the inner wire 110 and the outer wire 150 has a predetermined tension, the inner wire 110 may be shaped such that at least thereof is partially embedded in the inner surface of the coating 130, and the outer wire 150 may be shaped such that at least thereof is partially embedded in the outer surface of the coating 130.

Since the coating layer 130 is flexible, the coating layer 130 may be extended/contracted and bent/stretched depending on the form of fluid to be transported, the fluid pressure, and the environment in which the hose is used, if the coating layer 130 is longitudinally extended, the height of the seating groove 131a facing the radial direction of the coating layer 130 is reduced, and then, the inner surface of the coating layer 130 may be located on the same lines as the surface of the inner wire 110 facing the outer surface of the coating layer 130.

The composite hose 100 according to the present embodiment can suppress the longitudinal extension of the coating layer 130, thereby preventing the surface of the inner wire 110 facing the outer surface of the coating layer 130 from being positioned on the same lines as the inner surface of the coating layer 130.

To this end, the coating 130 may further include the tape 137 may support the coating 130 toward the center of the coating 130 (outward from the inside of the hose) more specifically, the tape 137 may be spirally wound between adjacent inner wires 110 and may support the area of the coating 130 around which the tape 137 is wound toward the center of the coating 130 by the tension of the tape 137.

The strap 137 may be formed of a polyamide fabric to surround the inner cover 131, but the present invention is not limited thereto. The straps may be surrounded by a reinforcing layer 133 and the straps 137 may preferably be made of the same material as the inner cover.

In addition, the pitch P of the inner wire 110 and the width d of the strap 137 may be variously changed according to the size of the composite hose 100. For example, if the pitch P of the inner wire 110 is in the range of 29mm to 31mm, the width d of the strip 137 may be in the range of 15mm to 17mm to minimize friction with fluid flowing in the composite hose, thereby minimizing variation in pitch. In addition, if the pitch P of the inner wire 110 is in the range of 29 to 31mm, the thickness t of the tape is preferably in the range of 0.7 to 0.9mm, but is not limited thereto. If the thickness t of the tape is less than 0.7mm, the tension of the tape is weak, so that the pitch of the inner wire 110 is easily changed. Meanwhile, if the thickness is greater than 0.9mm, the flexibility of the composite hose may be reduced. The external wire 150 may be formed at a position corresponding to the position of the strap 137 to surround the strap 137.

The composite hose 100 according to the present embodiment is configured such that the band 137 is installed in the region of the coating layer 130 between the adjacent inner wires 110, and the band 137 supports the coating layer 130 toward the center of the coating layer 130. then, because the longitudinal extension of the coating layer 130 is suppressed, the surface of the inner wire 110 facing the outer surface of the coating layer 130 is prevented from being located on the same line as lines with the inner surface of the coating layer 130.

The results of the hydrostatic test, the rupture test, and the rigidity test of the composite hose 100 according to the present embodiment will be described.

Hydrostatic pressure test

The leakage and elongation were measured by maintaining a hydraulic pressure of 1.5 times the maximum operating pressure in the composite hose 100 according to the present embodiment and the conventional composite hose for 5 minutes.

According to the test results, the composite hose 100 according to the present embodiment and the conventional composite hose did not have leakage. However, the length of the composite hose 100 according to the present embodiment is elongated from the original length of 2,041mm to 2,105mm by 3.14%, whereas the length of the conventional composite hose is elongated from the original length of 2,165mm to 2,250mm by 3.9%.

Since the composite hose 100 according to the present embodiment reduces the elongation of the length due to the tape 137, it can be seen that the elongation of the seating groove 131a of the coating layer 130 in the longitudinal direction is smaller than that of the coating layer 130. In this case, since the height of the seating groove 131a facing the radial direction of the coating 130 is less reduced, the inner wire 110 may be securely inserted and supported in the seating groove 131 a.

Rupture test

The burst pressure of each of the composite hose 100 according to the present embodiment and the conventional composite hose was measured.

According to the test results, in the composite hose 100 according to the present embodiment, the inner wire 110 was separated at 54.0 bar. However, in the conventional composite hose, the inner wires are separated at 52.3 bar. Therefore, it can be seen that the composite hose 100 according to the present embodiment has more excellent rigidity than the conventional composite hose. In the same pressure range, the composite hose according to the present embodiment is configured such that the tape strips function to increase the contact force between the inner cover layer and the reinforcing layer and to restrain the inner wires and the inner cover layer from leaving their original positions, thereby maintaining the complete inner shape of the composite hose. In contrast, it was confirmed that the conventional composite hose could not withstand the internal pressure and was depressed toward the inside of the hose, thereby causing severe deformation.

Rigidity test

After the composite hose 100 according to the present embodiment and the conventional composite hose are vertically fixed and connected to the load cell, they are vertically pulled. Subsequently, the tensile load caused by the change in length and the change in appearance were measured.

According to the test results, the length variation of the composite hose 100 according to the present embodiment is smaller than that of the conventional composite hose under the same force. When the same test is repeated, the composite hose 100 according to the present embodiment has excellent recyclability due to excellent elastic force.

When manufacturing the composite hose 100 according to the present embodiment, the pitch P of the inner wire 110 should be uniform. For this reason, the inventors developed a manufacturing apparatus 200 for manufacturing the composite hose 100 according to the present embodiment. The manufacturing apparatus 200 will be described with reference to fig. 5 to 7.

As shown in the drawing, the manufacturing apparatus 200 may include a mandrel 210, a support frame 230, a roller 250, and a cover 270.

The spindle 210 may be formed in the shape of a hollow cylinder and then rotatably installed.

The support frames 230 may be formed in a ring shape and mounted to the outer circumference of the spindle 210 in the circumferential direction of the spindle 210 two or more support frames 230 may be mounted and may rotate together with the spindle 210 .

The roller 250 may be mounted to each support frame 230 a plurality of rollers may be mounted to each support frame 230, and furthermore, the side of the roller 250 may protrude to the outside of the support frame 230.

The cover 270 may be formed in a cylindrical shape corresponding to the shape of the mandrel 210, may be installed to surround the mandrel 210, and may be concentric with the mandrel 210. furthermore, the inner circumference of the cover 270 is in contact with the outer circumference of the roller 250, and the composite hose 100 to be formed is wound around the outer circumference of the cover 270. the cover 270 is moved together with the mandrel 210 because the inner circumference of the cover 270 is in contact with and supported by the outer circumference of the roller 250.

Thus, if the roller 250 is rotated, the roller 250 may move in the longitudinal direction of the mandrel 210 from the end of the mandrel 210 to the other end, or may move in the longitudinal direction of the mandrel 210 from the other end to the end.

When the mandrel 210 is moved in the longitudinal direction thereof to move the roller 250, the area of the inner circumference of the cover 270 contacting the outer circumference of the roller 250 is changed. Since the area of the inner circumference of the cover 270 in contact with the roller 250 changes as the roller 250 moves, the cover 270 may expand outward from the center of the mandrel 210 (see fig. 6) or may contract toward the center of the mandrel 210 (see fig. 8). That is, the cap 270 may expand to an increased diameter shape and may contract to a reduced diameter shape.

In detail, the cover 270 may include a plurality of arc-shaped covers 271 that are identically formed, in the drawings, an embodiment is shown in which the covers 271 have -th covers 272, 273, and 274-th covers.

Both ends of each of the cover 272 to the third cover 274 are arranged in the longitudinal direction of the cap 270, and both sides of each of the cover 272 to the third cover 274 are arranged in the circumferential direction of the cap 270, and therefore, the side of the cover 272 and the side of the second cover 273, the side of the second cover 273 and the side of the third cover 274, and the side of the third cover 274 and the side of the cover 272 adjacent to each other face each other.

Elastic members 281 may be respectively installed at both ends of each of the th to third covers 272 to 274, 0 end of each elastic member 281 may be installed to be supported by each of the th, second and third covers 273 and 274 of the 1 st to third covers 272, the second and third covers 273 and 274, and the other end may be installed to be supported by each of the second, third and covers 273, and 272, which are adjacent to each other, whereby each elastic member 281 may be elastically supported such that a side of the th cover 272 and a side of the second cover 273, a side of the second and third covers 273 and 274, and a side of the third cover 274 and a side of the th cover 272, which are adjacent to each other, contact each other.

If the cover 271 is pushed out from the cover 270 by an external force greater than the elastic force of the elastic member 281 such that the side of the th cover 272 and the side of the second cover 273, the side of the second cover 273 and the side of the third cover 274, and the side of the third cover 274 and the side of the th cover 272 do not contact each other (see fig. 6), the diameter of the cover 270 increases and the cover 270 expands.

Further, since the side of the cover 272 and the side of the second cover 273, the side of the second cover 273 and the side of the third cover 274, and the side of the third cover 274 and the side of the cover 272 contact each other by the elastic member 281 (see fig. 8), the diameter of the cap 270 is reduced and the cap 270 is shrunk.

Support grooves 271a may be formed on both ends of the cover 271 to support the elastic member 281, thereby allowing the elastic member 281 to be stably mounted.

As described above, as the roller 250 moves and the area of the inner circumference of the cover 270 contacting the roller 250 changes, the cover 270 contracts and expands. This will be described below.

An inclined surface 271b may be formed on the inner circumference of the cover 270 at a position where the roller 250 is located, the inner radius of the inclined surface 271b linearly changes along the longitudinal direction of the cover 270, and the roller 250 may be in contact with the inclined surface 271 b. The inclined surface 271b may be gradually lowered from the inner circumference to the outer circumference of the cover 270, and the region of the cover 270 where the inclined surface 271b is formed has a different thickness.

Therefore, if the roller 250 comes into contact with the thick area of the inclined surface 271b of the cover 270 due to the movement of the mandrel 210 (see fig. 7), the cover 270 may expand due to the roller 250 pushing the cover 271 outward (see fig. 6). Meanwhile, if the roller 250 contacts the thin region of the inclined surface 271b of the cover 270 (see fig. 9), the cover 270 may be contracted by the elastic force of the elastic member 281 (see fig. 8).

The roller 250 is moved by means of the spindle 210. Therefore, if the moving distance of the mandrel 210 is limited, the moving distance of the roller 250 is limited, so that the roller 250 can move only in the vicinity of the inclined surface 271 b.

In order to limit the moving distance of the spindle 210, a locking slot 271c having a predetermined length in the longitudinal direction of the cap 270 may be formed on the inner circumference of the cover 271 of the cap 270. The support frames 230 and 230 adjacent to each other may be connected to each other by a plurality of connecting rods 240, and a stopper 241 for insertion into the locking slot 271c may be formed on each connecting rod 240.

Therefore, if the mandrel 210 is moved such that the roller 250 comes into contact with the thick area of the inclined surface 271b of the cover 270 (see fig. 7), the cover 271 overcomes the elastic force of the elastic member 281 by the roller 250 and moves outward from the center of the cover 270. Therefore, since the sides of the covers 271 adjacent to each other do not contact each other, the cover 270 is expanded (see fig. 6).

If the cover 270 is expanded, the inner wire 110 is spirally wound around the outer circumference of the cover 270 while rotating the mandrel 210, and the inner cover layer 131, the band 137, the reinforcement layer 133, and the outer cover layer 135 are sequentially wound around the inner wire 110, thereby forming the coating 130. Thereafter, the outer wire is spirally wound around the outer circumference of the reinforcing layer, thereby manufacturing the composite hose 100.

Subsequently, if the composite hose 100 has been manufactured, the mandrel 210 is moved so that the rollers 250 come into contact with the thin regions of the inclined surfaces 271b of the cover 270 (see fig. 9). Then, since the covers 271 are moved toward the center of the cover 270 by the elastic force of the elastic member 281, the sides of the adjacent covers 271 contact each other. Thus, the cover 270 is retracted (see fig. 8).

When the cover 270 has been contracted (as shown in fig. 8), a gap is formed between the inner circumference of the composite hose 100 and the outer circumference of the cover 270, so that the composite hose 100 can be easily taken out from the cover 270.

That is, since the inner wire 110 and the inner cover 131 of the composite hose 100 can be separated from the cap 270 without any friction, the pitch P of the inner wire 110 may be uniform.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is, therefore, to be understood that the scope of the invention is to be determined by the appended claims, and all changes that fall within metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the claims.

Description of the reference numerals of the important parts

110: inner wire

130: coating 131: inner cover layer

131a, 135 a: placing groove

133: reinforcing layer 135: outer cover layer

137: strap

150: external wire

200: manufacturing apparatus

210: mandrel 230: supporting frame

240: connecting rod 250: roller

270: cover 271: covering element

272: th covering part 273: second covering part

274: third cover