KR20190010819A - Buoy - Google Patents

Abstract

The present invention relates to a buoy having a communication part, capable of preventing damage to a buoy due to internal gas expansion. The buoy comprises: a cover part having a hollow part; and a communication part connected to a hole formed in the cover part, and allowing the hollow part to communicate with the outside.

Description

Buoy with traffic section {BUOY}

The present invention relates to buoys floating in water.

In the coastal waters, a marine biological farm is being operated in which fish, shellfish and seaweed are cultured in a net or growth plate by hanging net or growth plate on float.

Float is an essential element in the installation of netting or growth plates, but it is being identified as a major cause of marine pollution.

In order to solve the marine pollution problem, the existing floe fluid of the Styrofoam can be replaced by the polypropylene material.

Korean Patent Publication No. 1155877 discloses a buoy having improved corrosion resistance, weather resistance, chemical resistance, solvent resistance and strength of a float by applying a polypropylene film to the surface of a buoy formed from polypropylene foam.

Korean Patent Registration No. 1155877

The present invention is intended to provide a buoy in which gas inside can be easily discharged to the outside.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

The sub-table of the present invention includes a cover having a hollow portion; And a communication part connected to the hole formed in the cover part and communicating the hollow with the outside, and a flow path extending from the hole toward the hollow can be formed in the communication part.

In order to improve buoyancy and improve productivity, a hollow may be formed inside the buoy.

According to the present invention, since the so-called pores are provided in which the hollow gas can be discharged to the outside, the damage of the buoy due to the expansion of the gas inside can be prevented.

1 is a perspective view showing a sub-table of the present invention.
2 is a schematic view showing a state in which the sub-table of the present invention is cut.
3 is a schematic view showing the present invention.
Fig. 4 is a schematic view showing hollows divided into an upper region and a lower region by the support means; Fig.
Fig. 5 is a schematic view showing a communication part of the present invention. Fig.
6 is a schematic view showing a communication section having a first section and a second section.
7 is a schematic view showing the connecting means and the holding means according to the present invention.
8 is a schematic view showing a cover portion into which an air tube is inserted.
9 is a schematic view showing another sub-section of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

1 is a perspective view showing a sub-table of the present invention. 2 is a schematic view showing a state in which the sub-table of the present invention is cut.

The buoy shown in the figure may include a cover portion 110 and a communication portion 130.

The cover portion 110 forms the contour of the buoy and can be formed to provide buoyancy.

For example, the cover portion 110 may be formed in a cylindrical shape.

Conventional polystyrene buoys are prone to being sliced into fragments due to corrosion and shock. The scrapped pieces are difficult to recover and become environmental waste.

To prevent environmental pollution, buoys of polystyrene materials are gradually disappearing.

In order to replace the buoy of polystyrene, the cover 110 may include a material such as polyethylene, polypropylene, or polyurethane.

Since the cover 110 made of polyethylene is heavy and has a high strength as compared with a polystyrene material, it is difficult to form the cover 110 with the same volume as a buoy of a polystyrene material, and the buoyancy per unit volume is low.

In order to solve the productivity problem and buoyancy problem of the cover part 110, the cover part 110 may be formed hollow.

Due to the hollows 90 formed therein, the cover portion 110 can be light in weight and easy to manufacture. The hollow 90 may be formed similar to the shape of the cover portion 110. For example, the hollow 90 may be formed in a cylindrical shape with respect to the cover 110 formed in a cylindrical shape.

When the external water flows into the hollow 90, the buoyancy of the cover 110 may be lost, so that the hollow 90 may be formed to be hermetically sealed from the outside.

However, according to the hollow 90 sealed from the outside, the gas inside the hollow 90 can not be discharged to the outside. The cover portion 110 containing a material such as polyethylene can be exhausted into the interior of the cover portion 110 even after the fabrication is completed. Or used in an environment exposed to the sunlight, the gas in the hollow 90 can be expanded by being heated to a high temperature by the sunlight.

The exhaust gas or the thermally expanded gas gathered in the hollow 90 can not be discharged to the outside because of the hermetic structure, so that the cover part 110 is expanded, cracks are generated in the cover part 110 due to expansion, Can be broken.

When the hole 119 through which the exhaust gas or the like is discharged is formed in the cover 110 to prevent the cover 110 from being damaged, external water flows into the hollow 90 through the hole 119 Lt; / RTI >

It is proposed that a check valve (one-way valve) is directly installed in the hole 119 of the cover part 110 so that the outside water is prevented from penetrating into the hollow 90 and the gas of the hollow 90 is discharged to the outside However, it has not been put to practical use due to a phenomenon in which water flows into the hollow 90 as a result of long-term use.

The present invention can block external water from entering the hollow 90 and form a suitable pore 119 through which the gas of the hollow 90 can be easily discharged to the outside.

The cover portion 110 may be formed with a hole 119 for connecting the hollow 90 to the outside in order to form the pore 119.

The communication portion 130 is connected to the hole 119 formed in the cover portion 110 and can communicate the hollow 90 with the outside. At this time, the communication part 130 prevents external water from flowing into the hollow 90, and the gas of the hollow 90 can be discharged to the outside.

The communicating part 130 is provided with a flow path extending from the hole 119 of the cover part 110 to the hollow 90 of the cover part 110 so as to prevent the external water from flowing into the hollow 90 135 may be formed. The flow path 135 may include a tubular structure in which a fluid flows or a three-dimensional structure in which a fluid is communicated.

Even if external water is input into the flow path 135 through the hole 119 according to the flow path 135 extending in the hollow 90, the air pressure inside the hollow 90 and the capillary phenomenon of the flow path 135 the water can not escape into the hollow 90 and remains in the flow path 135 due to the phenomenon.

On the other hand, when the internal pressure of the hollow 90 is increased by the inflow of exhaust gas or thermal expansion, the gas of the hollow 90 can be easily discharged to the outside through the flow path 135.

It is preferable that the gap between the hole 119 of the cover portion 110 and the communication portion 130 be completely sealed. This is because the gap is directly connected to the hollow 90.

The communication portion 130 may be provided with a coupling means 133 which is coupled to the hole 119 while closing the hole 119. [ The engaging means 133 can be coupled to the hole 119 and close the hole 119, such as by screwing or fusing. At this time, one end of the flow path 135 may be connected to the coupling means 133 so as to open to the outside. The other end of the flow path 135 may extend from the coupling means 133 toward the hollow 90.

The coupling means 133 may be formed with a connecting hole 134 connected to one end of the flow path 135.

One end of the flow path 135 may be directly installed in the hole 119 of the cover portion 110 so long as the gap between the hole 119 of the cover portion 110 and the flow path 135 can be sealed.

According to the present invention, since one end of the flow path 135 is connected to the outside, external water may partially flow into the flow path 135. For example, when the hole 119 of the cover part 110 is immersed in water by a bird or the like, some water may flow into the communication part 130. Alternatively, if a wave hits the hole 119, some water may be introduced into the communication part 130 through the hole 119.

It is difficult for the water inputted into the flow path 135 to be directly output to the hollow 90 due to the flow path 135 extending to the inside of the hollow 90. However, when the physical force of the buoy to be oscillated by the algae, waves and the like is added, some water inside the flow path 135 can be output to the hollow 90. [

A method of preventing the water in the flow path 135 from being output to the hollow 90 may be added.

3 is a schematic view showing the present invention.

Floating buoys are difficult to determine because the upside and downside are inverted or transformed by birds, waves and winds. However, if a separate support means 60 is provided, the story may be changed.

The support means 60 can maintain the water-floating cover portion 110 connected to the cover portion 110 in a set posture.

For example, if you bind multiple buoys to a long bar, the bottom of the buoy can not be inverted, so the top and bottom of the buoy can be distinguished.

A bending line 118 wound on the rope 10 may be formed on the outer circumferential surface of the cover portion 110 to improve the manageability. The bending line 118 may correspond to a position where the bending line 118 is wound on the rope 10 from the outer peripheral surface of the cover portion 110.

The bending line 118 may be formed in a bony shape to prevent the rope 10 from being released. The bending line 118 may have a continuous smooth surface with the surface of the other portion when the release preventing member is provided with the bending line 118 therebetween and both sides connected to the surface of the cover portion 110. [

If the cover portion 110 is connected to the support means 60 by using a joint portion (not shown) separately formed on the rope 10 or the cover portion 110 wrapped around the bending line 118, Can be kept constant.

3, the ropes 10 wound around the respective cover portions 110 are connected to each other by annular support means 60 in a state where a plurality of cover portions 110 wound with the rope 10 are arranged in parallel .

Fig. 4 is a schematic view showing a hollow 90 divided into an upper region and a lower region by the support means 60. Fig.

The cover portions 110 connected to each other by the support means 60 are maintained in the set posture and the upper portion of the hollow portion 90 with respect to the center of the hollow portion 90 due to the cover portion 110, H and the lower region L can be determined. At this time, the flow path 135 may extend to the upper region H or may be formed to pass through the upper region H.

The upper region of the hollow 90 is likely to be located higher than the water surface 1. The water introduced into the communication portion 130 does not exceed the section of the oil passage 135 passing through the upper region H and the hollow portion (90).

Part of the upper region H may be submerged in water depending on the self-buoyancy of the cover 110 or the weight of the support supported by the cover 110.

A more limited floating region B can be defined in consideration of a situation in which a part of the upper region H is immersed in water.

5 is a schematic view showing the communication unit 130 of the present invention.

The floating region B can be defined as an area located above the water surface 1 in the hollow 90 when the cover portion 110 floats on the water.

5 (a) shows a state in which the cover part 110 is laid sideways on the water, and Fig. 5 (b) shows a state in which the cover part 110 is straight on water.

The flow path 135 of the present invention may be formed such that at least a portion thereof passes through the floating region B.

The floating region B may be formed mainly at the edge of the hollow 90. [ On the other hand, holes 119 may be formed at various positions of the cover portion 110. The flow path 135 may be formed to bend in the hollow 90 so that the flow path 135 extending from the hole 119 formed at various positions passes through the floating region B. [

A first inner wall surface 111 in which the hole 119 is formed in the cover portion 110 and a second inner wall surface 112 facing the first inner wall surface 111 with the hollow 90 therebetween can be defined . A third inner wall surface 113 and a fourth inner wall surface 114 disposed between the first inner wall surface 111 and the second inner wall surface 112 can be defined. At this time, the third inner wall surface 113 and the fourth inner wall surface 114 may face each other with the hollow 90 therebetween.

The flow path 135 has a first section 1 extending over the first inner wall surface 111 and the second inner wall surface 112 and a second section 1 extending over the third inner wall surface 113 and the fourth inner wall surface 114, Section < 2 >.

The position of the floating region B of the hollow 90 varies depending on the attitude of the cover 110 floated in the water, but the last route of the floating region B is the inner surface of the cover portion 110 facing the hollow 90.

Therefore, according to the first section ① extending from the first inner wall surface 111 to the second inner wall surface 112 by a plurality of times in a reciprocating manner, the cover section 110 can be positioned in a straight posture The flow path 135 can pass through the floating region B reliably. According to the second section (2) extending from the third inner wall surface (113) to the fourth inner wall surface (114) a plurality of times in a reciprocating manner, the flow path (135) can reliably pass through the floating region (B) in the remaining posture.

Therefore, if the flow path 135 has both the first section 1 and the second section 2, there is necessarily a section of the flow path 135 higher than the water surface 1, unless the entire hollow 90 is completely immersed in water, The water can not penetrate into the hollow 90 due to the section.

6 is a schematic view showing a communication unit 130 having a first section and a second section.

6 (a) shows a flow path 135 formed in a cross shape in a hollow 90. At this time, the uniaxial axis of the cross becomes the first section ①, and the other axis of the cross becomes the second section ②.

6 (b) shows a flow path 135 curved in a coil shape. At this time, the longitudinal direction of the coil forms the first section (1), and the width direction or circumferential direction of the coil can form the second section (2).

6 (c), the flow path 135 is formed in a coil shape along the inner circumferential surface of the cover portion 110 facing the hollow 90, while a second inner wall surface 112 (see FIG. 6 ).

It may be difficult to form the cross-shaped or coil-shaped flow path 135 by inserting the flexible tube through the hole 119 of the cover portion 110. Therefore, in the process of forming the cover 110, the flexible tube can be installed in the hollow 90. [

For example, when the cover portion 110 is molded through an insert injection for inserting the flexible tube into the chamber, the cover portion 110 having the flexible tube disposed in the hollow shape in a predetermined configuration can be completed.

According to the present invention as described above, one end of the flow path 135 is connected to the hole 119 of the cover part 110, and the center of the flow path 135 is connected to the cover part 110 facing the hollow 90, As shown in FIG. The flow path 135 extending to the inner surface of the cover portion 110 passes the floating region B so that external water can not pass through the flow path 135. On the other hand, in the case of the gas inside the hollow 90, even if a part of the flow path 135 is filled with water, it can be easily discharged to the outside through the flow path 135.

It is preferable that the hole 119 is formed in the non-immersion area which is not immersed in the water in the cover part 110, so that water does not flow through the hole 119 of the cover part 110. At this time, it is preferable that the other end of the flow path 135 existing in the hollow 90 is disposed around the hole 119. For example, the other end of the flow path 135 may be disposed in the floating region B on the first inner wall surface 111 side where the hole 119 is formed.

The other end of the flow path 135 disposed around the hole 119 is located at a position higher than the water surface 1 and therefore the water flowing into the vicinity of the other end of the flow path 135 is prevented from being discharged to the hollow 90 It can be a bulwark.

One end 139 of the tube can be easily fixed to the hole 119 through the coupling means 133 or the like when the flow path 135 includes a flexible tube bent in the hollow 90. [ On the other hand, the other end 138 of the flexible tube is hardly arranged as close as possible to the hole 119.

A separate connecting means 150 may be provided so that the other end 138 of the flexible tube is fixed at the set position.

7 is a schematic view showing the connecting means 150 and the holding means 170 according to the present invention.

The connecting means 150 can support the other end 138 of the tube in the body of the tube near one end 139 of the tube.

For example, the connection means 150 may include a connection portion 153 having a first hole 151 through which the body of the pipe passes, and a second hole 152 through which the other end 138 of the pipe passes. A cutout 155 cut from the edge of the connection part 153 to the first hole 151 or cut from the edge of the connection part 153 to the second hole 152 may be provided.

According to the cutout 155, the body of the pipe can be easily installed in the first hole 151, and the other end 138 of the pipe can be easily installed in the second hole 152.

The other end 138 of the pipe provided in the second hole 152 is connected to the body of the pipe by the connecting portion 153 and may be disposed in the floating region B on the side of the hole 119.

On the other hand, the flexible tube may be difficult to hold in a cross shape or a coil shape in the hollow 90. The present invention may be provided with a holding means 170 for connecting the pipe to the pipe body so that the pipe is kept bent in a predetermined shape.

When the tube is supported on the inner surface of the cover portion 110 facing the hollow 90, the separate holding means 170 can be omitted. Alternatively, if the flexible tube is heated while being bent in a set shape and then cooled, the tube can be maintained in the set shape.

The communication part 130 of the present invention can be installed in the hollow 90 through the hole 119 of the cover part 110 after the cover part 110 having the hollow 90 is completed.

It is not easy for the flow path 135 such as the flexible tube inserted through the hole 119 to be maintained in the shape of a cross or a coil in the hollow 90.

An air tube 200 inserted into the hollow 90 so as to form the flow path 135 may be provided.

8 is a schematic view showing a cover portion 110 into which the air tube 200 is inserted.

The air tube 200 can expand when the gas is injected and shrink when the gas is released.

The air tube 200 in a collapsed state as shown in FIG. 8 (a) can be easily inserted into the hollow 90 through the hole 119.

At this time, the flow path 135 may be formed directly on the outer surface of the air tube 200 or wound around the outer surface of the air tube 200.

For example, the air tube 200 can be inserted into the hollow 90 through the hole 119 while the flexible tube is wound around the outer surface of the air tube 200. Thereafter, when the air is injected through the injection port 203 of the air tube 200, the air tube 200 can be expanded inside the hollow 90 as shown in FIG. 8 (b). The flow path 135 surrounding the outer surface of the air tube 200 can be changed into a coil shape passing through the floating region B by the expansion of the air tube 200. [

When the injection of air into the air tube 200 is completed, the injection port 203 of the air tube 200 is closed, the injection port 203 is inserted into the hollow 90 through the hole 119, The installation of the communication unit 130 can be completed.

The air tube 200 not only keeps the set shape of the flow path 135 in the hollow 90, but also can provide a buoyancy space as much as the space in which the gas is injected. Therefore, even if cracks are generated in the cover part 110 due to external impact such as collision of the ship, sinking of the cover part 110 by the air tube 200 can be prevented.

9 is a schematic view showing another sub-section of the present invention.

A check valve 190 may be additionally provided at a position spaced apart from the hole 119 in the flow path 135 to reliably prevent the external water from being introduced into the hollow 90. [

The check valve 190 can be formed with a very simple structure by using the fact that the water pressure inside the flow path 135 is not high due to the floating space B.

For example, the flow path 135 may include a first tube portion 131 and a second tube portion 132 which are connected to each other in the hollow 90. For example, the first tube portion 131 may include a flow path 135 extending from the hole 119 until entering the first section? And the second section? Associated with the floating region B. The second tube portion 132 may include a channel 135 corresponding to the first section 1 or the second section 2.

The first tube portion 131 may be disposed closer to the flow outer side of the fluid, i. E., Closer to the hole 119 than the second tube portion 132. The second tube portion 132 may be disposed further away from the flow-side hollow 90 side of the fluid, that is, the hole 119 than the second tube portion 132. In other words, when the position of the water existing outside the cover 110 is defined as the upstream and the hollow 90 corresponding to the destination of the water flows downstream is defined as the downstream, And can be disposed on the upstream side of the bifurcated portion (132).

The check valve 190 may be installed between the first tube portion 131 and the second tube portion 132. The water pressure of the water existing between the first tube portion 131 and the second tube portion 132 separated from the hole 119 by the air pressure inside the hollow 90 and the capillary phenomenon may be considerably low.

The check valve 190 provided between the first tube portion 131 and the second tube portion 132 extends from the second tube portion 132 toward the first tube portion 131 and is inserted into the through hole 136 of the first tube portion 131 And a flexible vinyl tube inserted into the flexible tube.

As shown in FIG. 9 (b), when the air pressure of the hollow 90 is increased, the vinyl tube may be fluttered due to the pressure difference. The gas of the hollow 90 is output to the first tube portion 131 through the opened vinyl tube and discharged to the outside through the hole 119 connected to the first tube portion 131.

9 (c), when the water flows in from the first tube portion 131 side, the vinyl tube can be closed while being folded or curled. The water inputted into the first tube portion 131 due to the closing of the vinyl tube may not flow to the second tube portion 132.

The water can not be output to the hollow 90 due to the first section ① and the second section ② of the oil passage 135 corresponding to the second tube section 132 even if water passing through the diaphragm and the vinyl tube exists.

On the other hand, a plurality of holes may be formed in the cover portion. At this time, a plurality of flow paths may be connected to one hole or may be connected to each hole, respectively. According to this embodiment in which a plurality of flow paths are connected to the hollow and the outside, the fluid in the hollow can be easily circulated. For example, when the inside of the hollow is filled with water, the water inside the hollow can be taken out to the outside by using a plurality of flow paths.

For example, the flow path may include a double tube in which a plurality of passages through which the fluid flows. Both ends of each passage forming the double pipe may be provided with an entrance through which the fluid enters and exits.

One end of the double pipe can be exposed to the outside through the hole of the cover portion so that the hollow fluid can be forcibly extracted to the outside. According to this embodiment, the openings of the plural passages can be exposed to the outside through the holes. When negative pressure is applied to one of the outlets of the plurality of passages exposed to the outside, the gas inside the hollow can be discharged to the outside while the outside gas is inserted into the hollow through the remaining outlets.

On the other hand, a channel having a longer length can be formed by using the double pipe.

For example, any one of the outlets of each passage provided at one end of the double pipe can be exposed to the outside through the hole of the cover portion. At this time, the outlets of the respective passages formed at the other end of the double pipe can be connected to communicate with each other so that the respective passages included in the double pipe are communicated with each other. In this case, if the length of the double pipe is S and the number of the passages included in the double pipe is n, if the remaining exits are exposed to the outside through the holes in the entrance of each passage formed at one end of the double pipe, A flow path of a multiplied length can be provided.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

1 ... sleep 10 ... rope
60 ... support means 90 ... hollow
110 ... cover part 111 ... first inner wall surface
112 ... second inner wall surface 113 ... third inner wall surface
114 ... fourth inner wall surface 118 ... bending line
119 ... hole 130 ... communication part
131 ... first tube portion 132 ... second tube portion
133 ... coupling means 134 ... connected hole
135 ... passage 150 ... connecting means
151 ... first hole 152 ... second hole
153 ... connection part 155 ... incision part
170 ... Holding means 190 ... Check valve
200 ... air tube 203 ... inlet

Claims (17)

A cover portion having a hollow;
And a communication part connected to the hole formed in the cover part and communicating the hollow with the outside,
And a flow path extending from the hole toward the hollow is formed in the communication portion.
The method according to claim 1,
The communicating part prevents external water from flowing into the hollow, and the hollow gas is discharged to the outside.
The method according to claim 1,
A supporting means connected to the cover portion and holding the cover portion floating in water in a set posture is provided,
The upper and lower regions of the hollow are determined by the cover portion maintained in the set posture,
The flow path extending to the upper region or passing through the upper region.
The method according to claim 1,
When a region of the hollow above the water surface is defined as a floating region when the cover portion is floated on water,
Wherein the flow path is formed such that at least a part of the flow path passes through the floating region.
5. The method of claim 4,
Said channel being bent in said hollow to pass through said floating region.
The method according to claim 1,
A first inner wall surface having the hole formed in the cover portion, a second inner wall surface facing the first inner wall surface with the hollow therebetween, and a second inner wall surface disposed between the first inner wall surface and the second inner wall surface, When the third inner wall surface and the fourth inner wall surface facing each other are defined,
Wherein the flow path includes a first section extending across the first inner wall surface and the second inner wall surface, and a second section extending across the third inner wall surface and the fourth inner wall surface.
The method according to claim 1,
Wherein the flow path is formed in a coil shape along an inner circumferential surface of the cover portion facing the hollow and extends to a second inner wall surface facing the hole.
The method according to claim 1,
One end of the flow path is connected to the hole,
And a middle portion of the flow path extends to the inner surface of the cover portion facing the hollow.
9. The method of claim 8,
And the other end of the flow path is disposed around the hole.
The method according to claim 1,
Wherein the flow path includes a flexible tube bent in the hollow,
One end of the tube is connected to the hole,
And a connecting means for supporting the other end of the tube on the body of the tube near one end of the tube.
The method according to claim 1,
Wherein the flow path includes a flexible tube bent in the hollow,
And a holding means for connecting the bodies of the tubes so that the tube is kept bent in a predetermined shape.
The method according to claim 1,
An air tube inserted into the hollow is provided,
The flow path is formed on the outer surface of the air tube or wound around the outer surface of the air tube.
The method according to claim 1,
The communicating portion is provided with engaging means for engaging with the hole while closing the hole,
One end of the flow path is connected to the coupling means so as to open to the outside,
And the other end of the flow path extends from the coupling means toward the hollow.
The method according to claim 1,
And a check valve is provided at a position spaced apart from the hole in the flow path.
The method according to claim 1,
Wherein the flow path includes a first tube portion and a second tube portion connected to each other in the hollow,
A check valve is provided between the first tube portion on the outer side and the second tube portion on the hollow side,
Wherein the check valve comprises a flexible vinyl tube extending from the second tube portion toward the first tube portion and inserted into the aperture of the first tube portion.
The method according to claim 1,
Wherein the flow path includes a double tube in which a plurality of passages through which a fluid flows,
Wherein one end of the double pipe provided with the entrance and exit of each passage is exposed to the outside through the hole so that the hollow fluid can be forcibly extracted to the outside.
The method according to claim 1,
Wherein the flow path includes a double tube in which a plurality of passages through which a fluid flows,
The two ends of each of the passages forming the double pipe are provided with entrances and exits for the fluid to enter and exit,
Only one of the entrance and exit of each passage provided at one end of the double tube is exposed to the outside through the hole,
And the entrances of the respective passages formed at the other end of the double pipe are connected to each other so that the passages included in the double pipe are communicated with each other.

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