KR102186612B1 - Oxygen line compensator for fuel cell system of submarine - Google Patents

Abstract

The present invention is to provide a compensator for an oxygen line of a submarine fuel cell system having high durability against pit corrosion and stress corrosion and withstands external stress and pressure.
Accordingly, in the present invention, a first corrugated pipe made by overlapping two layers, a connection pipe that is joined to both ends in the longitudinal direction of the first corrugated pipe, and a first space and a first mount are formed at regular intervals on the outer periphery, respectively, and the first corrugated pipe A first metal fiber having both ends fixed to the first mount while covering a part of the connection pipe, a second corrugated tube surrounding the first corrugated tube wrapped with the first metal fiber, and at both ends in the longitudinal direction of the second corrugated tube The second space is joined, and a second space corresponding to the first space of the connection pipe is formed on the inner periphery, and the end cap having a second mount on the outer periphery, and the second corrugated pipe and a part of the end cap are wrapped Disclosed is a compensator for an oxygen line of a submarine fuel cell system including a second metal fiber having both ends fixed to a mount.

Description

Compensator for oxygen line of submarine fuel cell system {OXYGEN LINE COMPENSATOR FOR FUEL CELL SYSTEM OF SUBMARINE}

The present invention relates to a compensator installed on a line (path) for supplying or discharging oxygen from the outside to a fuel cell system of a submarine, and more particularly, resistance to pit corrosion and stress corrosion, and external It relates to a compensator for an oxygen line of a submarine fuel cell system with high durability to withstand stress and pressure.

In order to solve the problem of the short duration of submersion of military diesel submarines, research and technology development of an air-free engine (air-independent propulsion system) that produces oxygen by itself with fuel cells has been conducted. By installing a fuel cell system, submarines are being introduced that can improve cruising speed, increase the time available for high-speed navigation, and enable underwater operations (submersion) for a long time without injury.

This fuel cell system controls the chemical reaction rate of hydrogen and oxygen to produce electric energy directly from the chemical energy of hydrogen, so even if it is not supplied with air from the outside, the power required for propulsion of the submarine and the survival of the crew. Can be stably provided.

Meanwhile, the submarine's fuel cell system stores high-density liquid oxygen in an oxygen tank and supplies it to a fuel cell in order to increase power production efficiency and minimize its volume due to the nature of an environment where oxygen is scarce.

That is, as shown in Fig. 1, liquid oxygen is supplied from the outside of the submarine through a separate supply line and stored in an oxygen tank inside the submarine, and the stress due to temperature change in the supplying process of oxygen is on this supply line (path). In addition, a compensator is provided for compensating, preventing vibrations from being transmitted to the oxygen tank and the hull, and preventing damage and failure of the system.

However, due to the characteristic of the conventional compensator having a corrugated pipe with a thickness of about 0.6mm inside, due to abnormal seawater inflow, pit-shaped corrosion, that is, pit corrosion, occurs intensively in the valley of the corrugated pipe and grows into a fancy There is a problem that oxygen leaks by making a small hole.

The background technology or the prior art described herein is information possessed by the present inventors or acquired in the process of deriving the present invention, and is only intended to help understand the technical significance of the present invention. It is stated that it does not mean a widely known technology in the field.

KR 10-1747560 B1 (2017.06.08) KR 10-2015-0088115 A(2015.07.31) KR 10-2013-0055189 A(2013.05.28)

Accordingly, the inventors of the present invention comprehensively consider the above-described matters and, from the idea of solving the technical limitations and problems of the existing compensators, increase the resistance to pit corrosion and stress corrosion, and increase the durability to withstand external stress and pressure. In the midst of continuous research with great efforts to develop a compensator for the oxygen line of the submarine fuel cell system of a new structure that can improve stability and prevent local concentration by distributing stress. As a result, the present invention was created.

Accordingly, it is an object of the present invention to provide a compensator for an oxygen line of a submarine fuel cell system capable of improving stress corrosion resistance and durability withstanding pressure.

Another technical problem and object to be solved by the present invention is to provide a compensator for an oxygen line of a submarine fuel cell system to ensure stress dispersion and stability.

Herein, the technical problems and objects to be solved by the present invention are not limited to the technical problems and objects mentioned above, and other technical problems and objects not mentioned will be clearly understood by those skilled in the art from the following description.

A specific means according to an aspect of the present invention for achieving the above-described object and solving the technical problem is a first corrugated pipe made by overlapping two layers, for connecting pipes to both ends in the longitudinal direction of the first corrugated pipe A first metal fiber fixed and fixed at both ends of the first mount while wrapping a first space and a first mount at regular intervals on the outer periphery of each of the connector, the first corrugated pipe and a portion of the connector, A second corrugated pipe enclosing the first corrugated pipe wrapped with the first metal fiber at regular intervals, a second corrugated pipe fixed to both ends of the second corrugated pipe in the longitudinal direction, and corresponding to the first space of the connecting pipe at the inner periphery A space is formed and a second mount is formed at the outer periphery of the end cap, and the second corrugated pipe and a second metal fiber fixed at both ends of the second mount while surrounding a part of the end cap are employed. We present a compensator for oxygen line of submarine fuel cell system.

Accordingly, according to the present invention, the first corrugated pipe and the second corrugated pipe have a double structure that prevents the propagation and diffusion of pit corrosion, so as to prevent leakage of oxygen due to corrosion, as well as increase resistance to stress corrosion Durability to withstand external stress and pressure can be greatly improved.

In a preferred embodiment of the present invention, the first metal fiber may be formed by overlapping at least two layers.

In a preferred embodiment of the present invention, the connecting pipe is formed with an outer diameter larger than the inner diameter of the first corrugated pipe and a smaller outer diameter than the outer diameter of the first corrugated pipe, and the diameter gradually decreases toward the outer end. The first corrugated pipe is formed in a shape, and the first space and the first mount are integrally formed on the inclined surface of the taper, so that when reinforcing fibers are installed around the outer circumference of the first corrugated pipe and the connecting pipe, the first corrugated pipe It is possible to prevent the phenomenon that the stress is concentrated on both ends of.

In a preferred embodiment of the present invention, the connection pipe is formed in a cylindrical shape having an outer diameter larger than the inner diameter of the first corrugated pipe and a smaller outer diameter than the outer diameter of the first corrugated pipe, and the first metal fiber around the outer periphery A step correction ring is mounted between the and the outer diameter and the step difference of the first corrugated pipe to disperse the stress, so that the first corrugated pipe and the first corrugated pipe and the first due to the step difference between the connecting pipe when reinforcing fibers are installed It is possible to prevent the phenomenon that stress is concentrated on both ends of the corrugated pipe.

An aspect of the present invention with means and configuration for achieving the above object and solving the technical problem is a double structure that prevents propagation and diffusion of pit corrosion, in which two or more corrugated pipes are overlapped. Therefore, leakage of oxygen due to corrosion of the corrugated pipe can be prevented.

In other words, even if corrosion occurs in the first corrugated pipe through which oxygen flows due to the inflow of seawater, the second corrugated pipe located outside the corrugated pipe provides secondary protection, effectively preventing the leakage of oxygen, and increasing resistance to stress corrosion. , It can greatly improve the durability to withstand external stress and pressure.

In addition, connecting pipes having an outer diameter larger than the inner diameter and smaller than the outer diameter at both ends of the first corrugated pipe, and forming a taper surface to smoothly correct the step difference or attaching a step correction ring to the connecting pipe When a reinforcing fiber is installed around the outer circumference of the connector, it is possible to secure structural stability by preventing the phenomenon that stress is concentrated at both ends of the first corrugated pipe due to the step difference with the connector.

Here, the effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic diagram showing an oxygen supply line of a submarine fuel cell system according to the prior art.
2 is a longitudinal sectional view showing a compensator for an oxygen line of the submarine fuel cell system according to the first embodiment of the present invention.
3 is a partially exploded longitudinal cross-sectional view of a compensator for an oxygen line of a submarine fuel cell system according to a first embodiment of the present invention.
4 is a longitudinal sectional view showing a compensator for an oxygen line of a submarine fuel cell system according to a second embodiment of the present invention.
5 is a partially exploded longitudinal cross-sectional view of a compensator for an oxygen line of a submarine fuel cell system according to a second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

Prior to this, the terms to be described later are defined in consideration of functions in the present invention, and this should be interpreted as a concept conforming to the technical idea of the present invention and a meaning commonly or commonly recognized in the art.

In addition, when it is determined that a detailed description of known functions or configurations related to the present invention may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Herein, the accompanying drawings are partially exaggerated or simplified for explanation of the configuration and operation of the technology, and for convenience and clarity of understanding, and it is understood that each component does not exactly match the actual size and shape.

In addition, in the present specification, the term and/or means a combination of a plurality of related items or any item among a plurality of related items, and when a certain part includes a certain element, it is a particularly opposite description. Unless there is no other component is not excluded, it means that other components can be further included.

That is, it means that the features, numbers, steps, actions, components, parts, or combinations of these described in the present specification exist, and one or more other features or numbers, step-action components, parts, or a combination thereof It is to be understood that they do not exclude the possibility of their existence or addition.

In addition, terms such as top, bottom, top, bottom, or top, bottom, top, bottom, front and rear, left and right are used for convenience to distinguish the relative positions of each component. For example, the upper part on the drawing may be named or referred to as the upper part and the lower part as the lower part, the length direction as the front-rear direction, and the width direction as the left-right direction.

Also, terms such as first and second may be used to describe various components. That is, terms such as first and second may be used only for the purpose of distinguishing one component from another component. For example, a first component may be referred to as a second component without departing from the protection scope of the present invention, and a second component may also be referred to as a first component.

<Example 1>

2 and 3, the compensator 1 for the oxygen line of the submarine fuel cell system according to the first embodiment of the present invention includes a first corrugated pipe 10, a connection pipe 20, and a first metal fiber. (30), a second corrugated pipe 40, an end cap 50, and a second metal fiber 60.

The first corrugated pipe 10 is made of an alloy material having a high nickel content, and is made by overlapping the inner corrugated tube 11 and the outer corrugated tube 12 having different diameters made by corrugating in the shape of an accordion cylinder.

The connection pipes 20 are respectively joined to both ends of the first corrugated pipe 10 in the longitudinal direction by TIG welding in order to stably connect and connect the first corrugated pipe 10 with the pipe.

And the outer circumferential surface of the connector 20, the first space 21 protruding is formed to keep the gap with the end cap 50 evenly and determine the fixed position when assembling by covering the end cap 50 , A first mount 22 protruding from the first space 21 to support the mounting state of the first metal fiber 30 is formed at a predetermined interval.

In addition, the connection pipe 20 minimizes and mitigates the step difference with the first corrugated pipe 10 when the first metal fiber 30 is wrapped around the outer circumference together with the first corrugated pipe 10, In order to prevent stress from being concentrated at both ends of the tube, the outer diameter is larger than the inner diameter of the first corrugated tube 10 and smaller than the outer diameter of the first corrugated tube 10, and the diameter gradually decreases toward the outer end. The paper is formed in a tapered shape.

In addition, the first space 21 and the first mount 22 are integrally formed on the tapered slope of the connection pipe 20.

Both ends of the first metal fiber 30 are fixed by the first mount 22 while surrounding a part of the first corrugated pipe 10 and the connecting pipe 20 in order to reinforce and reinforce mechanical properties.

In other words, the first metal fiber 30 has a fine diameter of a metal such as stainless steel and is made into fibers so that the length is 100 times or more compared to the diameter, so that it has a high degree of flexibility and possesses the inherent mechanical properties, heat resistance, and corrosion resistance of the metal. , It is possible to protect and strengthen the first corrugated pipe 10 and the connector 20.

Here, it is preferable that the first metal fiber 30 is wound by overlapping at least two or more layers.

For example, the first metal fiber 30 may be formed by overlapping the inner metal fiber 31 and the outer metal fiber 32 in two layers.

The second corrugated tube 40 is made of an alloy material having a high nickel content and is corrugated in the shape of an accordion, and surrounds the first corrugated tube 10 wrapped with the first metal fiber 30 at regular intervals.

In addition, the second corrugated pipe 40 is preferably electropolished or painted on its surface to prevent corrosion.

The end cap 50 is made of a tubular shape having an inner diameter larger than the outer diameter of the connecting pipe 20 in order to maintain a state in which the second corrugated pipe 40 covers the first corrugated pipe 10 at regular intervals. They are respectively joined to both ends in the length direction of 40) by a method such as TIG welding.

And on the inner circumferential surface of the end cap 50, a second space 51 for maintaining a space between the connection pipe 20 and determining a fixed position, and achieving a stable fixed state therebetween is a connection pipe 20 It is formed to correspond to the first space 21 of the second space 51 and a second mount 52 protruding to support the mounting state of the second metal fiber 60 at a regular interval have.

Here, the second space 51 of the end cap 50 and the first space 21 of the connection pipe 20 may be fixed to each other by welding or the like.

In order to reinforce and reinforce mechanical properties, the second metal fiber 60 is fixed at both ends by a second mount 52 while surrounding a portion of the second corrugated pipe 40 and the end cap 50.

In other words, the second metal fiber 60 has a fine diameter of a metal such as stainless steel and is made into fibers so that its length is more than 100 times the diameter, so that it has a high degree of flexibility and possesses the inherent mechanical properties, heat resistance, and corrosion resistance of the metal. , It is possible to protect and reinforce the second corrugated pipe 40 and the end cap 50.

The oxygen line compensator 1 of the submarine fuel cell system according to the first embodiment of the present invention configured as described above has a double structure in which the first corrugated pipe 10 and the second corrugated pipe 40 have a certain gap and overlap each other. Therefore, it is possible to effectively prevent leakage of oxygen (liquid oxygen, a state in which liquid oxygen is vaporized by temperature rise, gaseous oxygen) by preventing the propagation and diffusion of pit corrosion.

That is, even when corrosion occurs due to the inflow of seawater into the first corrugated pipe 10 among the paths for supplying oxygen to the oxygen tank inside the submarine, the second corrugated pipe 40 provides secondary protection to prevent oxygen leakage. By effectively blocking it, you can prevent dangerous consequences from occurring.

In addition, the first corrugated pipe 10 and the second corrugated pipe 40, the first metal fiber 30 and the second metal fiber 60 each have a double structure, which increases resistance to stress corrosion and withstands external stress and pressure. Durability can be greatly improved.

In addition, the outer circumferential surface of the connection pipe 20 is formed as a tapered surface that distributes stress by minimizing and gently alleviating the step difference with the first corrugated pipe 10, so that the first corrugated pipe 10 and the connecting pipe 20 When installing the first metal fiber 30 around the outer circumference of the first corrugated pipe 10 and the connecting pipe 20, the stress is concentrated on both ends of the first corrugated pipe 10 in the longitudinal direction due to the difference in height. To ensure structural stability.

<Example 2>

4 and 5, the oxygen line compensator 1 ′ of the submarine fuel cell system according to the second embodiment of the present invention includes a first corrugated pipe 10, a connection pipe 20, and a first metal. It includes a fiber 30, a second corrugated pipe 40, an end cap 50, a second metal fiber 60, and a step correction ring 70.

In particular, the connection pipe 20 is formed in a cylindrical shape whose outer diameter is larger than the inner diameter of the first corrugated pipe 10 and smaller than the outer diameter of the first corrugated pipe 10, and together with the first corrugated pipe 10, 1 When wrapping the metal fiber 30, the first metal fiber around the outer circumference is minimized and relaxed to prevent stress concentration at both ends of the first corrugated tube 10 by minimizing and mitigating the step with the first corrugated tube 10. A step correction ring 70 for distributing stress by correcting the outer diameter and the step difference of the first corrugated pipe 10 is mounted between (30) and.

That is, the step correction ring 70 is formed in a tapered shape whose outer diameter gradually decreases as the outer periphery goes toward one end in the left and right longitudinal direction, thereby minimizing the step difference with the first corrugated pipe 10 and It can be relieved gently.

The oxygen line compensator 1'of the submarine fuel cell system according to the second embodiment of the present invention configured as described above has a step difference with the first corrugated pipe 10 on the outer circumferential surface of the connecting pipe 20 having a cylindrical shape. When installing the first corrugated pipe (10) and the first metal fiber (30) around the outer circumference of the connecting pipe (20) by installing the step correction ring (70) to distribute the stress by minimizing and gently alleviating Due to the difference in height between (10) and the connection pipe (20), it is possible to prevent a phenomenon in which stress is concentrated at both ends of the first corrugated pipe (10) in the longitudinal direction.

Here, among the components related to the compensator 1'for the liquid oxygen supply line of the submarine fuel cell system according to the second embodiment of the present invention, the same reference numerals are used for components having the same or similar effects as in the first embodiment. And, a repetitive and detailed description thereof will be omitted.

On the other hand, the present invention is not limited by the above-described embodiments and the accompanying drawings, and can be variously modified and applied in various ways not illustrated without departing from the technical spirit of the present invention. It is apparent to those of ordinary skill in the art that substitutions and other equivalent examples may be applied widely.

Therefore, the content related to the modification and application of the technical features of the present invention should be interpreted as being included within the spirit and scope of the present invention.

1: compensator 10: first corrugated tube
11: inner corrugated tube 12: outer corrugated tube
20: connector 21: first space
22: first mount 30: first metal fiber
31: inner metal fiber 32: outer metal fiber
40: second corrugated tube 50: end cap
51: second space 52: second mount
60: second metal fiber 70: step correction ring

Claims (6)

A first corrugated tube 10 made by overlapping two layers; A connection pipe 20 that is joined to both ends of the first corrugated pipe 10 in the longitudinal direction, and has a first space 21 and a first mount 22 formed at an outer periphery at regular intervals; A first metal fiber (30) having both ends fixed to the first mount (22) while covering a portion of the first corrugated pipe (10) and the connector pipe (20); A second corrugated tube 40 surrounding the first corrugated tube 10 wrapped with the first metal fiber 30 at regular intervals; An end cap 50 joined to both ends of the second corrugated pipe 40 in the longitudinal direction and having a second mount 52 formed at the outer periphery; And a second metal fiber 60 fixed at both ends of the second mount 52 while surrounding a portion of the second corrugated pipe 40 and the end cap 50;
The connection pipe 20 has an outer diameter larger than the inner diameter of the first corrugated pipe 10 and has an outer diameter smaller than the outer diameter of the first corrugated pipe 10, and the diameter gradually decreases toward the outer end. And the first space (21) and the first mount (22) are integrally formed on the tapered inclined surface of the submarine fuel cell system.
The method of claim 1,
The first metal fiber 30 is a compensator for an oxygen line of a submarine fuel cell system formed by overlapping at least two or more layers.
delete The method of claim 1,
The connection pipe 20 includes a step correction ring 70 for distributing stress by gently correcting the outer diameter and the step difference of the first corrugated pipe 10 between the outer circumference and the first metal fiber 30 Compensator for the oxygen line of the installed submarine fuel cell system.
The method of claim 1,
The end cap 50 is a compensator for an oxygen line of a submarine fuel cell system in which a second space 51 corresponding to the first space 21 of the connection pipe 20 is formed at an inner periphery.
The method of claim 1,
The second corrugated pipe 40 is a compensator for an oxygen line of a submarine fuel cell system for electrolytic polishing or painting to prevent corrosion on the surface.

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