Piping structure and piping method for cooling systems on ships

Abstract

The objective is to provide a piping structure and piping method for a cooling system inside a ship that can prevent condensation in refrigerant pipes and also offers excellent maintainability. [Solution] The invention comprises a refrigerant pipe installed inside a ship through which a refrigerant flows, and an insulating section provided on the outside of the refrigerant pipe, wherein the refrigerant pipe is connected to a cooling device which is a refrigerator or freezer installed inside the ship, and the insulating section is attached to the outer surface of the refrigerant pipe and has multiple insulating layers.

Description

Technical Field

[0001] The present invention relates to a piping structure and a piping method for a cooling device in a ship.

Background Art

[0002] A refrigerant pipe that is piped in a ship and through which a refrigerant flows inside, and a heat insulation part provided outside the refrigerant pipe are provided. The piping structure described in Patent Document 1 in which the refrigerant pipe is connected to a cooling device such as a refrigerator or a freezer installed in the ship is conventionally known.

[0003] According to the above document, while the heat insulation part can prevent the refrigerant pipe from condensing due to the temperature difference between its inside and outside, since a fluid heat insulation material such as urethane foam is cured to cover the periphery of the refrigerant pipe to form the heat insulation part, the subsequent maintainability deteriorates.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a piping structure and a piping method for a cooling device in a ship that can prevent condensation of a refrigerant pipe and have excellent maintainability.

Means for Solving the Problems

[0006] To solve the above problems, the piping structure for a cooling device inside a ship according to the present invention comprises a refrigerant pipe that is installed inside the ship and through which a refrigerant flows, and an insulating part provided on the outside of the refrigerant pipe, wherein the refrigerant pipe is connected to a cooling device which is a refrigerator or freezer installed inside the ship, and the insulating part is attached to the outer surface side of the refrigerant pipe and has a plurality of insulating layers The insulation layer has an inner covering portion that covers the outer surface of each of the parallel refrigerant pipes, and an outer covering portion that covers the outer surface side of the inner covering portion. In cross-sectional view, the outer covering portion has a concave portion that faces the space between the refrigerant pipes, and the thickness of the outer covering portion is greater than the thickness of the inner covering portion. It is characterized by the following.

[0007] The aforementioned covering portion is covered with insulating tape. parallel Attached or wrapped around multiple refrigerant pipes Ta It may be considered as such.

[0008] The inner covering portion, in cross-sectional view, is in contact with the outer surface of the refrigerant pipe over its entire circumference, and the outer covering portion is, On the outer surface of the inner covering portion contact It may be assumed that it is.

[0009] On the other hand, the present invention provides a piping method for a cooling device inside a ship, comprising the steps of connecting a refrigerant pipe to a cooling device which is a refrigerator or freezer installed inside the ship and piping it inside the ship, and providing an insulating portion on the outer surface side of the piped refrigerant pipe, wherein the insulating portion is attached to the outer surface side of the refrigerant pipe and has multiple insulating layers The insulation layer has an inner covering portion that covers the outer surface of each of the parallel refrigerant pipes, and an outer covering portion that covers the outer surface side of the inner covering portion. In cross-sectional view, the outer covering portion has a concave portion that faces the space between the refrigerant pipes, and the thickness of the outer covering portion is greater than the thickness of the inner covering portion. It is characterized by the following. [Effects of the Invention]

[0010] The insulating section, which is attached to the outer surface of the refrigerant pipe and has multiple insulating layers, effectively prevents condensation on the refrigerant pipe. Furthermore, if a problem occurs with the refrigerant pipe, the insulating section attached to that pipe can be removed, resulting in high maintainability. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing the configuration of a ship. [Figure 2] This is a schematic diagram showing the refrigeration cycle. [Figure 3] This is a cross-sectional view showing a piping structure comprising a single refrigerant pipe and an insulated section. [Figure 4]This is a cross-sectional view showing a piping structure comprising parallel refrigerant pipes and insulation sections. [Figure 5] This is a cross-sectional view of a piping structure according to another embodiment of the present invention. [Figure 6] Figure 5 is a cross-sectional view showing an embodiment in which the piping structure is installed near the peripheral wall. [Figure 7] This is a cross-sectional view of a piping structure according to another embodiment of the present invention. [Figure 8] This is a cross-sectional view of a piping structure according to another embodiment of the present invention. [Figure 9] This is a flow chart showing a piping method to which the present invention is applied. [Modes for carrying out the invention]

[0012] Figure 1 is a schematic diagram showing the configuration of a ship, and Figure 2 is a schematic diagram showing a refrigeration cycle. In the illustrated example, ship 1 is a refrigerated ship, freezer ship, or fishing vessel that transports items requiring refrigeration, such as food, and has multiple cooling devices 2, which are refrigerators or freezers, installed inside. These cooling devices 2 contain items and maintain a low temperature inside them. Furthermore, the cooling devices 2 are supplied with a refrigerant that circulates through a refrigeration cycle 3 installed inside ship 1.

[0013] The refrigeration cycle 3 consists of a compressor 4, a condenser 6, an expansion valve 7, and a cooling unit 8, and refrigerant pipes 9 that connect these and through which the refrigerant flows. The cooling unit 8 is, for example, an evaporator or a heat exchanger, and is installed in each of the cooling devices 2 described above. The refrigerant pipes 9 are branched and piped to connect to each cooling unit 8 at an intermediate point from the condenser 6. The expansion valves 7 are provided at each branch of the refrigerant pipes 9 before reaching the cooling unit 8.

[0014] The compressor 4 compresses the medium-temperature, low-pressure, gaseous refrigerant flowing in from the cooling unit 8 through the refrigerant pipe 9, causing it to flow out into the refrigerant pipe 9 as a high-temperature, high-pressure, gaseous refrigerant.

[0015] The condenser 6 cools the high-temperature, high-pressure gaseous refrigerant flowing in from the compressor 4 via the refrigerant pipe 9, and discharges it into the refrigerant pipe 9 as a medium-temperature, high-pressure liquid refrigerant. The condenser 6 is provided with a pump for supplying cooling water for cooling the refrigerant from the outside, or a fan for sending cold air for cooling the refrigerant. Note that the condenser 6 may be a water-cooled type provided with a pump or an air-cooled type provided with a fan, and its specific configuration is not limited.

[0016] The expansion valve 7 allows the medium-temperature, high-pressure liquid refrigerant flowing in from the condenser 6 via the refrigerant pipe 9 to flow through its interior, and discharges it into the refrigerant pipe 9 as a low-temperature, low-pressure liquid refrigerant. The expansion valve 7 has a very small-diameter flow path formed inside it. As the refrigerant flows through the flow path, its flow velocity increases, and its pressure and temperature decrease.

[0017] The cooling unit 8 cools the interior of the cooling device 2 by exchanging heat between the low-temperature, low-pressure liquid refrigerant flowing in from the expansion valve 7 via the refrigerant pipe 9 and the air in the cooling device 2, and discharges the refrigerant into the refrigerant pipe 9 as a medium-temperature, low-pressure gaseous refrigerant. Further, the refrigerant flowing out from the cooling unit 8 flows back into the compressor 4 via the refrigerant pipe 9. At this time, the refrigerant pipes 9 piped from each cooling unit 8 to the compressor 4 are piped so as to merge with other refrigerant pipes 9 at an intermediate portion until reaching the compressor 4.

[0018] When connecting the compressor 4, the condenser 6, the expansion valve 7, and the cooling unit 8, a part of the refrigerant pipe 9 is piped in a bent state. Also, the refrigerant pipe 9 is piped in a T-shape at the locations where it branches or merges with other refrigerant pipes 9 as described above.

[0019] This allows refrigerant to be supplied to each of the multiple cooling devices 2 installed within the ship 1. Note that the configuration of the refrigeration cycle 3 is not limited to the example described above. For example, when using two types of refrigerants with different boiling points, a binary refrigeration cycle may be used, where the above-described refrigeration cycle 3 is provided for each type of refrigerant and these are connected by a cascade condenser.

[0020] Furthermore, the refrigerant pipes 9, which are individually routed from each of the multiple cooling devices 2, are consolidated in one place and routed in parallel throughout the ship.

[0021] Next, the configuration of the refrigerant pipe 9 and the insulation section 11 will be described based on Figure 3.

[0022] Figure 3 is a cross-sectional view showing a piping structure comprising a single refrigerant pipe and an insulating section. In the illustrated example, the structure comprises a refrigerant pipe 9 that is installed inside the ship 1 and through which the refrigerant flows, and an insulating section 11 that is provided on the outside of the refrigerant pipe 9 and insulates the inside of the refrigerant pipe 9 from the outside. The insulating section 11 is attached to the outer surface of the refrigerant pipe 9 and has multiple insulating layers 12.

[0023] The thermal insulation layer 12 is composed of a covering portion that covers at least a portion of the outer surface of the refrigerant pipe 9 (in this example, it covers the entire outer surface). The thermal insulation layer 11 has an inner covering portion 12A and an outer covering portion 12B as the covering portion 12.

[0024] Each covering portion 12 is formed at least partially (in this example, entirely) by attaching or wrapping (in this example, wrapping) an insulating tape to the outer surface of the refrigerant pipe 9. The insulating tape is mainly made of closed-cell nitrile synthetic rubber and has enough flexibility to bend along the outer surface of the refrigerant pipe 9.

[0025] The inner covering portion 12A adheres closely to the outer surface of the refrigerant pipe 9 and covers the entire circumference of the outer surface, forming an inner insulation layer (insulation layer) 12A.

[0026] The outer covering portion 12B adheres closely to the outer circumferential surface of the inner covering portion 12A and covers the entire circumference of the outer circumferential surface, forming the outer insulation layer (insulation layer) 12B. The outer insulation layer 12B is formed by overlapping the outer circumferential surface of the cylindrical inner insulation layer 12A.

[0027] Furthermore, the heat-insulating tape constituting the outer covering portion 12B is mainly made of closed-cell nitrile-based synthetic rubber and has superior flexibility compared to the heat-insulating tape constituting the inner covering portion 12A described above.

[0028] Furthermore, each covering portion 12 only needs to have the degree of flexibility and excellent heat insulation properties described above, and is not limited to a configuration where all of the covering portions 12 are heat insulating tapes. For example, each covering portion 12 may be configured to cover the outer surface of the refrigerant pipe 9 to be covered with a rubber tube or rubber sheet that has heat insulating properties. Alternatively, either the inner covering portion 12A or the outer covering portion 12B may be made of heat insulating tape.

[0029] Next, a piping structure comprising parallel refrigerant pipes 9,9 and an insulating section 11 will be described based on Figure 4.

[0030] Figure 4 is a cross-sectional view showing a piping configuration comprising parallel refrigerant pipes and an insulating section. In the illustrated example, there are multiple (specifically, two) parallel refrigerant pipes 9, 9 and an insulating section 11 provided on the outside of the refrigerant pipes 9, 9. The insulating section 11 is attached to the outer surface of the refrigerant pipes 9, 9 and has multiple insulating layers 12.

[0031] The thermal insulation layer 12 is composed of a covering portion that covers at least a portion of the outer surface of the refrigerant pipes 9, 9 (in this example, it covers the entire outer surface). The thermal insulation layer 11 has an inner covering portion 12A, 12A and an outer covering portion 12B as the covering portion 12.

[0032] Each covering portion 12 is formed by attaching or wrapping (in this example, wrapping) an insulating tape similar to that used for each covering portion 12 in the above example to the outer surface of the refrigerant pipe 9, thereby forming at least a part of (in this example, all of) the covering portion 12.

[0033] The inner covering portions 12A, 12A individually adhere to the outer surface of each of the parallel refrigerant pipes 9, 9 and cover the entire circumference of the outer surface, forming the inner insulation layer 12A, 12A.

[0034] Each inner covering portion 12A has a circular outer surface when viewed in cross-section. Furthermore, one inner covering portion 12A is formed such that, in cross-section, it has a point of contact on the circumference of its outer surface with the circumference of the outer surface of the other inner covering portion 12A that covers the refrigerant pipe 9 it covers and the adjacent refrigerant pipe 9. In other words, one inner covering portion 12A and the other inner covering portion 12A that covers the refrigerant pipe 9 it covers and the adjacent refrigerant pipe 9 are formed so that their respective outer surfaces are in contact with each other.

[0035] The outer covering portion 12B is formed by overlapping at least a portion of the outer surface of the cylindrical inner insulation layers 12A, 12A (in this example, the majority excluding the contact points between the inner covering portions 12A, 12A) with the inner covering portions 12A, 12A, which cover the periphery of the multiple parallel refrigerant pipes 9, 9.

[0036] More specifically, the outer covering portion 12B adheres closely to the outer circumferential surfaces of the inner covering portions 12A, 12A, which individually cover each of the parallel refrigerant pipes 9, 9, and also covers the outer circumferential surfaces of these inner covering portions 12A, 12A collectively. The outer covering portion 12B is curved along the outer circumferential surfaces of the inner covering portions 12A, 12A so as to adhere closely to them, and in cross-sectional view it forms a sideways figure-eight shape. This prevents gaps from forming between each covering portion 12A, 12A, 12B and efficiently prevents condensation on the refrigerant pipes 9, 9.

[0037] Next, a piping structure according to another embodiment of the present invention will be described based on Figures 5 and 6.

[0038] Figure 5 is a cross-sectional view of a piping structure according to another embodiment of the present invention, and Figure 6 is a cross-sectional view showing the piping structure shown in Figure 5 installed near the peripheral wall. In the illustrated example, there are multiple (two in this example) refrigerant pipes 9, 9 installed in parallel, and an insulating section 11 provided on the outside of the refrigerant pipes 9, 9. The insulating section 11 is attached to the outer surface side of the refrigerant pipes 9, 9 and has multiple insulating layers 12 and insulating members 13.

[0039] The thermal insulation layer 12 is composed of a covering portion that covers at least a portion of the outer surface of the refrigerant pipes 9, 9 (in this example, it covers the outer surface of multiple parallel refrigerant pipes 9, 9 together). The thermal insulation layer 11 has an intermediate covering portion 12C and an outer covering portion 12B as the covering portion 12.

[0040] The intermediate covering portion 12C is formed, at least in part, by attaching or wrapping (in this example, wrapping) an insulating tape to the outer surface of a plurality of parallel refrigerant pipes 9, 9. The insulating tape is mainly made of closed-cell nitrile synthetic rubber and has enough flexibility to bend along the outer surface of the refrigerant pipes 9.

[0041] The outer covering portion 12B is formed by attaching or wrapping (in this example, wrapping) the same type of heat insulating tape as the outer covering portion 12B in the above example to the outer circumferential surface of the intermediate covering portion 12C, thereby forming at least a part (in this example, all of it).

[0042] The intermediate covering portion 12C adheres closely to a part of the outer surface of the multiple parallel refrigerant pipes 9, 9 and covers the area around these refrigerant pipes 9, 9 together, forming an intermediate insulation layer 12C around the multiple parallel refrigerant pipes 9, 9. Specifically, the intermediate covering portion 12C adheres closely to the outer surface of approximately half of the circumference of the multiple parallel refrigerant pipes 9, 9 in the direction that they are separated from each other in the parallel direction (in the illustrated example, the left-right direction, hereinafter referred to as the "left-right direction"), forming a cylindrical intermediate insulation layer 12C that has an elongated elliptical shape in cross-section in the left-right direction.

[0043] The outer covering portion 12B adheres closely to the outer circumferential surface of the intermediate covering portion 12C and covers the entire circumference of the outer circumferential surface, forming an outer insulation layer 12B that overlaps the outer circumferential surface of the cylindrical intermediate insulation layer 12C.

[0044] The thermal insulation member 13 is a rectangular plate-like member that, in cross-sectional view, has a long rectangular shape in the direction that intersects the parallel directions of the multiple refrigerant pipes 9, 9 (in the illustrated example, this is the vertical direction, and hereinafter referred to as the "vertical direction"). The thermal insulation member 13 is covered on its outer surface by the intermediate covering portion 12C and is interposed between adjacent refrigerant pipes 9, 9 that are arranged in parallel. The thermal insulation member 13 is mainly made of closed-cell nitrile synthetic rubber and has the same or approximately the same thermal insulation properties as the thermal insulation sheet that constitutes the intermediate covering portion 12C described above.

[0045] The heat insulating member 13 is held between the refrigerant pipes 9, 9 on both sides in the left-right direction, in contact with the outer surfaces of the refrigerant pipes 9, 9.

[0046] According to this configuration, since the insulating member 13 is interposed between a plurality of parallel refrigerant pipes 9, 9, even if the spacing between adjacent refrigerant pipes 9, 9 is large and it is difficult to tightly adhere the outer covering portion 12B to almost the entire circumference of the outer surface of the inner covering portion 12A, the insulating member 13 can fill the gaps between each covering portion 12A, 12B, thereby efficiently preventing condensation on the refrigerant pipes 9, 9.

[0047] Furthermore, as shown in Figure 6, when the refrigerant pipes 9, 9 described above are routed in parallel near the perimeter wall 14 inside the ship 1, the outer covering portion 12B is constructed by attaching a portion of the heat-insulating tape constituting the outer covering portion 12B to the perimeter wall 14 and then wrapping it around the outer surface of the intermediate covering portion 12C.

[0048] As a result, even when it is difficult to cover the entire circumference of the intermediate covering portion 12C with the outer covering portion 12B due to the refrigerant pipe 9 being routed near the peripheral wall 14, the outer covering portion 12B is in close contact with the peripheral wall 14 inside the ship 1 and covers most of the area around the intermediate covering portion 12C, thereby providing an effective heat insulation effect and preventing condensation on the refrigerant pipes 9, 9.

[0049] Furthermore, the outer covering portion 12B may be covered with another covering portion, and the number of insulation layers may be increased. In other words, the multiple insulation layers constituting the insulation portion 11 are not limited to two or three layers, but may be a multi-layer structure of more than two layers.

[0050] Next, a piping structure according to another embodiment of the present invention will be described based on Figure 7.

[0051] Figure 7 is a cross-sectional view of a piping structure according to another embodiment of the present invention. The illustrated piping structure comprises a plurality (five in this example) of refrigerant pipes 9,9,9,9,9 arranged in parallel, and an insulating section 11. The insulating section 11 comprises a cylindrical covering unit 16 that covers the entire area around the plurality of parallel refrigerant pipes 9,9,9,9,9, and a plate-shaped insulating member 13 interposed between adjacent refrigerant pipes 9,9,9,9,9 arranged in parallel within the cylindrical shape of the covering unit 16.

[0052] The covering unit 16 has a plurality of covering covers 17, 18 (two in the illustrated example) arranged in the circumferential direction. The covering covers 17, 18 each have a main body made of an insulating material and a cover that covers the outer surface of the main body. One covering cover 17 is a first covering cover 17 whose cross-section is formed in a U-shape that is long in the parallel direction of the plurality of parallel refrigerant pipes 9,9,9,9,9, and the other covering cover 18 is a second covering cover 18 that covers the open portion of the U-shape of the first covering cover 17.

[0053] The ends of adjacent covering covers 17 and 18 in the circumferential direction of the covering unit 16 overlap to form multiple insulation layers. In other words, each covering cover 17 and 18 functions as the aforementioned insulation layer.

[0054] Next, a piping structure according to another embodiment of the present invention will be described based on Figure 8.

[0055] Figure 8 is a cross-sectional view of a piping structure according to another embodiment of the present invention. In the illustrated example, there are multiple (two in this example) refrigerant pipes 9, 9 arranged in parallel, and an insulating section 11 provided on the outside of the refrigerant pipes 9, 9. The insulating section 11 is attached to the outer surface of the refrigerant pipes 9, 9 and has multiple insulating layers 12 and insulating members 13.

[0056] The thermal insulation layer 12 is composed of a covering portion that covers at least a portion of the outer surface of the refrigerant pipes 9, 9 (in this example, it covers the entire outer surface). The thermal insulation layer 11 has an inner covering portion 12A and an outer covering portion 12B as the covering portion 12.

[0057] Each covering portion 12 is formed by attaching or wrapping (in this example, wrapping) an insulating tape similar to that used for each covering portion 12 in the above example to the outer surface of the refrigerant pipe 9, thereby forming at least a part of (in this example, all of) the covering portion 12.

[0058] The inner covering portions 12A, 12A individually adhere to the outer surface of each of the parallel refrigerant pipes 9, 9 and cover the entire circumference of the outer surface, forming the inner insulation layer 12A, 12A.

[0059] The outer covering portion 12B adheres closely to a part of the outer surface of the inner covering portions 12A, 12A, which individually cover the outer surface of each of the multiple parallel refrigerant pipes 9, 9, and also covers the periphery of these inner covering portions 12A, 12A collectively. The outer covering portion 12B adheres closely to approximately half of the outer surface of the cylindrical inner insulation layers 12A, 12A that individually cover the multiple parallel refrigerant pipes 9, 9, in the direction that is further apart from each other in the left-right direction, and forms a cylindrical outer insulation layer 12B that is elongated in the left-right direction in cross-section.

[0060] The heat insulating member 13 is sandwiched between the inner covering portions 12A, 12A, which cover the outer surfaces of the refrigerant pipes 9, 9, from both sides in the left-right direction within the outer covering portion 12B.

[0061] With the piping structure for the cooling system inside a ship configured as described above, the insulating section 11, which is attached to the outer surface of the refrigerant pipe 9 and has multiple insulating layers 12, can efficiently prevent condensation on the refrigerant pipe 9. Furthermore, if a problem occurs with the refrigerant pipe 9, the insulating section 11 attached to that refrigerant pipe 9 can be removed, thus providing high maintainability.

[0062] Next, a series of steps for a piping method for a cooling system 2 inside a ship 1, to which the present invention is applied, will be described based on Figure 9.

[0063] Figure 9 is a flow chart showing a piping method to which the present invention is applied. The illustrated piping method includes a piping step S101 and an insulation step S102.

[0064] The piping process S101 is the process of connecting the refrigerant pipes 9 to the cooling device 2, which is a refrigerator or freezer installed inside the ship 1, and piping them within the ship 1. After all the refrigerant pipes 9 have been installed, the process proceeds to the insulation process S102.

[0065] The insulation process S102 is a process of providing an insulation portion 11 on the outer surface side of the refrigerant pipe 9 that was installed in the piping process S101. The insulation portion 11 provided in the insulation process S102 is attached to the outer surface side of the refrigerant pipe 9 and has multiple insulation layers 12.

[0066] Furthermore, the heat insulating portion 11 has a covering portion 12 that constitutes a single heat insulating layer 12 and covers at least a part of the outer surface of the refrigerant pipe 9, or covers the periphery of a plurality of parallel refrigerant pipes 9 together. In the heat insulating process S102, an inner covering process is performed to form an inner heat insulating layer 12A by providing an inner covering portion 12A that is in close contact with and covers the outer surface of the refrigerant pipe 9 on the outer surface of the refrigerant pipe 9. Subsequently, an outer covering process is performed to form an outer heat insulating layer 12B by providing an outer covering portion 12B that is in close contact with and covers the outer surface of the inner covering portion 12A on the outer surface of the inner covering portion 12A.

[0067] The insulation process S102 includes a winding process in which insulation tape is wrapped around the outer surface of the non-bent portion of the refrigerant pipe 9, and an application process in which insulation tape is attached to the outer surface of the bent portion of the refrigerant pipe 9 along its bent shape. This makes it possible to provide an insulation portion 11 even in the bent portion of the refrigerant pipe 9.

[0068] When the insulation process S102 is completed, the series of processes is terminated.

[0069] Incidentally, if the heat insulating section 11 has the heat insulating member 13 described above, the heat insulating process S102 includes an insertion process of inserting the heat insulating member 13 between a plurality of parallel refrigerant pipes 9, 9. The heat insulating member 13 may be the plate-shaped member described above, but if the spacing between the refrigerant pipes 9, 9 is small, a heat insulating sheet molded to have a thickness smaller than that of a plate-shaped member is used.

[0070] Furthermore, the insulation process S102 is not limited to the insulation portion 11 being constructed by attaching, wrapping, or inserting insulation tape or sheet to the outer surface of the refrigerant pipe 9.

[0071] For example, the aforementioned insulation layers 12, 17, and 18 may be constructed by cutting a cylindrical member, which is mostly made of an elastically deformable insulation material such as urethane foam, along its axial and radial lines, to form a C-shaped cover body that can be separated in the circumferential direction in cross-section. Incidentally, a cover sheet may be provided to cover the outer surface of this cover body over its entire circumferential direction.

[0072] Alternatively, the cover body may be housed on the inner circumferential surface of the refrigerant pipe 9 by separating its separation surfaces, allowing the refrigerant pipe 9 to be accommodated through the resulting gap, and then reconnecting the separation surfaces of the cover body integrally with an adhesive or the like. It is also possible to attach multiple of these cover bodies to the outer circumferential surface of the refrigerant pipe 9 in an axial direction, and then integrally connect adjacent ones in the axial direction with an adhesive or the like.

[0073] Since the cover body is elastically deformable, it can be applied to refrigerant pipes 9 composed of T-shaped pipes, and even with such a shape, it is possible to cover the outer surface without any gaps. Furthermore, it is possible to attach another cover body to the outer surface of the cover body. Moreover, in the configuration shown in Figure 6, it is not necessary to integrally connect and fix the separation surfaces of the cover body together by adhesive or the like.

[0074] Alternatively, a pair of half-cut cover bodies that form a C-shape in cross-section may be connected and fixed to each other with their inner circumferential surfaces facing each other to form a circular, annular insulating layer 12, 17, 18 in cross-section. [Explanation of Symbols]

[0075] 1 ship 2 Cooling device 9 Refrigerant pipes 11. Insulation section 12. Covering (insulation layer) 12A Inner covering part ( Insulation layer ) 12B Outer covering part ( Insulation layer )

Claims

1. A refrigerant pipe installed inside a ship through which a refrigerant flows, The refrigerant pipe is provided with an insulating section on the outside, The refrigerant pipe is connected to a cooling device, which is a refrigerator or freezer, installed inside the ship. The aforementioned heat insulating section is attached to the outer surface side of the refrigerant pipe and has multiple heat insulating layers. A piping structure for a cooling system inside a ship, characterized by the following features.

2. The aforementioned heat insulating portion has a single heat insulating layer and covers at least a portion of the outer surface of the refrigerant pipe, or a covering portion that covers the periphery of multiple parallel refrigerant pipes together. A piping structure for a cooling system inside a ship, as described in claim 1.

3. The covering portion is formed by attaching or wrapping insulating tape around the outer surface of the refrigerant pipe or around a plurality of parallel refrigerant pipes, at least a part of it. The piping structure for a cooling system inside a ship according to claim 2.

4. The heat insulating portion comprises an inner covering portion which is in close contact with and covers the outer surface of the refrigerant pipe, and an outer covering portion which is in close contact with and covers the outer surface of the inner covering portion. A piping structure for a cooling system in a ship according to claim 2 or 3.

5. The heat insulating portion comprises an inner covering portion which is a covering portion that individually adheres to and covers the outer surface of each of the multiple parallel refrigerant pipes, and an outer covering portion which is a covering portion whose outer surface is covered by the inner covering portion and which covers the periphery of the multiple parallel refrigerant pipes together. The outer covering portion is curved along the outer surface so as to be in close contact with the outer surface of the inner covering portion. A piping structure for a cooling system in a ship according to claim 2 or 3.

6. The aforementioned heat insulating portion comprises a covering portion configured to collectively cover the perimeter of a plurality of parallel refrigerant pipes, and a plate-shaped heat insulating member interposed between adjacent parallel refrigerant pipes. A piping structure for a cooling system in a ship according to claim 2 or 3.

7. The aforementioned heat-insulating section has a covering unit that collectively covers the area around a plurality of parallel refrigerant pipes. The covering unit has a plurality of covering covers arranged in the circumferential direction, In the aforementioned covering unit, adjacent covering covers in the circumferential direction overlap each other in a portion of their circumferential direction, forming multiple heat insulating layers. A piping structure for a cooling system inside a ship, as described in claim 1.

8. The heat insulating portion comprises an outer covering portion configured to collectively cover the periphery of a plurality of parallel refrigerant pipes, and an inner covering portion that individually adheres to and covers the outer circumferential surfaces of each of the plurality of refrigerant pipes within the outer covering portion. The piping structure for a cooling system in a ship according to claim 6.

9. The heat insulating portion includes an intermediate covering portion which is configured to cover the periphery of a plurality of parallel refrigerant pipes, and an outer covering portion which covers the outer surface of the intermediate covering portion. The piping structure for a cooling system in a ship according to claim 6.

10. The process of connecting refrigerant pipes to a cooling device, which is a refrigerator or freezer, installed inside the ship and piping it inside the ship, The process includes the step of providing an insulating portion on the outer surface side of the installed refrigerant pipe, The aforementioned heat insulating section is attached to the outer surface side of the refrigerant pipe and has multiple heat insulating layers. A piping method for a cooling system inside a ship, characterized by the features described herein.

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