WO-2026094731-A1 - PIPING STRUCTURE

WO2026094731A1WO 2026094731 A1WO2026094731 A1WO 2026094731A1WO-2026094731-A1

Abstract

[Problem] To provide a piping structure for a cooling device in a ship. [Solution] This piping structure includes: a first refrigerant pipe 120 in which a refrigerant flows from a compressor 104 to a condenser 106; a second refrigerant pipe 122 in which the refrigerant flows from the condenser 106 to a first branching part 132; a third refrigerant pipe 124 in which the refrigerant flows from the first branching part 132 to an expansion valve 107; a fourth refrigerant pipe 126 in which the refrigerant flows from the expansion valve 107 to a cooling unit 108; a fifth refrigerant pipe 128 in which the refrigerant flows from the cooling unit 108 to a second branching part 134; and a sixth refrigerant pipe 130 in which the refrigerant flows from the second branching part 134 to the compressor 104.

Inventors

MURATA TAKANORI

Assignees

株式会社HA-RU

Dates

Publication Date: 20260507
Application Date: 20251022
Priority Date: 20241029

Claims (2)

A piping structure in a ship in which refrigerant circulates in the following order: compressor, condenser, first branch, expansion valve, cooling unit, second branch, and the compressor, A first refrigerant pipe through which the refrigerant flows from the compressor to the condenser, A second refrigerant pipe through which the refrigerant flows from the condenser to the first branch section, A third refrigerant pipe through which the refrigerant flows from the first branch to the expansion valve, A fourth refrigerant pipe through which the refrigerant flows from the expansion valve to the cooling unit, A fifth refrigerant pipe through which the refrigerant flows from the cooling unit to the second branch section, A sixth refrigerant pipe through which the refrigerant flows from the second branch to the compressor, Equipped with, The inner diameter of the first refrigerant pipe is 20 mm to 65 mm. The inner diameter of the second refrigerant pipe is 30 mm to 50 mm. The inner diameter of the third refrigerant pipe is 20 mm to 40 mm. The inner diameter of the fourth refrigerant pipe is 10 mm to 40 mm. The inner diameter of the fifth refrigerant pipe is 20 mm to 65 mm. The inner diameter of the sixth refrigerant pipe is 65 mm to 100 mm. Coverings are provided on the outer surfaces of the first refrigerant pipe, the second refrigerant pipe, and the fourth to sixth refrigerant pipes. The covering portion of the first refrigerant pipe, the second refrigerant pipe, and the sixth refrigerant pipe is a single layer, and the thickness of the covering portion is 20 mm to 35 mm. A portion of the third refrigerant pipe is provided with a covering, and the thickness of the covering is 20 mm to 35 mm. If the gap between one of the aforementioned fourth refrigerant pipes and the other adjacent aforementioned fourth refrigerant pipe is 15 mm to 70 mm, The covering portion of one of the fourth refrigerant pipes and the covering portion of the other fourth refrigerant pipes are one or two layers thick, and the sum of the thickness of the covering portion of one of the fourth refrigerant pipes and the thickness of the covering portion of the other fourth refrigerant pipes is less than or equal to the gap between one of the fourth refrigerant pipes and the other adjacent fourth refrigerant pipes. If the gap between one of the aforementioned fourth refrigerant pipes and the other adjacent aforementioned fourth refrigerant pipe is greater than 70 mm, The covering portion of one of the fourth refrigerant pipes and the covering portion of the other fourth refrigerant pipe are one layer, and the thickness of the covering portion of one of the fourth refrigerant pipes and the thickness of the covering portion of the other fourth refrigerant pipe are 20 mm to 35 mm. If the gap between one of the fifth refrigerant pipes and the other adjacent fifth refrigerant pipe is 15 mm to 70 mm, The covering portion of one of the fifth refrigerant pipes and the covering portion of the other fifth refrigerant pipes are one or two layers thick, and the sum of the thickness of the covering portion of one of the fifth refrigerant pipes and the thickness of the covering portion of the other fifth refrigerant pipes is less than or equal to the gap between one of the fifth refrigerant pipes and the other fifth refrigerant pipe. If the gap between one of the fifth refrigerant pipes and the other adjacent fifth refrigerant pipe is greater than 70 mm, The piping structure is such that the covering portion of one fifth refrigerant pipe and the covering portion of the other fifth refrigerant pipe are one layer, and the thickness of the covering portion of one fifth refrigerant pipe and the thickness of the covering portion of the other fifth refrigerant pipe are 20 mm to 35 mm.
A piping structure according to claim 1, wherein the covering portion is a closed-cell nitrile synthetic rubber having an apparent density of 45 kg/ m³ to 55 kg/ m³ , a thermal conductivity of 0.034 W/m·k to 0.038 W/m·k, and a moisture permeability coefficient of 0.18 ng/( m² ·s·Pa) to 0.19 ng/( m² ·s·Pa).

Description

Piping structure This invention relates to a piping structure for a cooling system in a ship. Patent Document 1 describes a piping structure comprising 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. In the piping structure described in Patent Document 1, condensation on the refrigerant pipe is prevented by the insulation layer. However, because the insulation layer surrounding the refrigerant pipe is formed from a fluid insulating material such as hardened urethane foam, the maintainability of the refrigerant pipe is compromised. Schematic diagram showing the configuration of a shipSchematic diagram showing the refrigeration cycleCross-sectional view showing a piping structure with a single refrigerant pipe and insulation section.Cross-sectional view showing a piping structure comprising parallel refrigerant pipes and insulated sections.Cross-sectional view of a piping structure according to another embodiment of the present inventionFigure 5 is a cross-sectional view showing a configuration in which the piping structure is installed near the perimeter wall.Cross-sectional view of a piping structure according to another embodiment of the present inventionCross-sectional view of a piping structure according to another embodiment of the present inventionFlowchart showing a piping method to which the present invention is applied.Schematic diagram showing a refrigeration cycle of a piping structure according to another embodiment of the present invention.Figure 11A is a cross-sectional view of a single-layer coating 136, and Figure 11B is a cross-sectional view of a double-layer coating 136. Figure 1 is a schematic diagram showing the configuration of a ship, and Figure 2 is a schematic diagram showing the refrigeration cycle. Ship 1 is a refrigerated ship, freezer ship, or fishing vessel, etc., used for transporting items such as food that require refrigeration. Multiple cooling devices 2, which are refrigerators or freezers, are installed inside Ship 1. The items to be transported are housed inside the cooling devices 2, and the temperature inside the cooling devices 2 is maintained at a low temperature by supplying refrigerant to the cooling devices 2. The refrigerant circulates through a refrigeration cycle 3 installed inside Ship 1. The refrigeration cycle 3 comprises a compressor 4, a condenser 6, an expansion valve 7, a cooling unit 8, and refrigerant pipes 9. The refrigerant pipes 9 are routed to connect these components. Refrigerant flows through the inside of the refrigerant pipes 9. The cooling unit 8 is, for example, an evaporator or a heat exchanger, and is installed in each cooling device 2. The refrigerant pipes 9 branch off and are routed from the condenser 6 to each cooling unit 8. The condenser 6 is connected to each cooling unit 8 by the refrigerant pipes 9. The expansion valve 7 is located upstream of each cooling unit 8 on the branched refrigerant pipe 9. The compressor 4 compresses the low-temperature, low-pressure gaseous refrigerant flowing in from the cooling unit 8 via the refrigerant pipe 9, and discharges the high-temperature, high-pressure gaseous refrigerant into the condenser 6 via the refrigerant pipe 9. The condenser 6 condenses and liquefies the high-temperature, high-pressure gaseous refrigerant flowing in from the compressor 4, and discharges the medium-temperature, high-pressure liquid refrigerant through the refrigerant pipe 9 to the expansion valve 7. The condenser 6 is equipped with a pump to supply cooling water from an external source for cooling the refrigerant, or a fan to blow cool air to cool the refrigerant. The condenser 6 may be a water-cooled type with a pump, or an air-cooled type with a fan; its specific configuration is not limited. The expansion valve 7 reduces the pressure of the medium-temperature, high-pressure liquid refrigerant flowing in from the condenser 6, and allows the low-temperature, low-pressure liquid refrigerant to flow out to the cooling unit 8 via the refrigerant pipe 9. A very small-diameter flow path is formed inside the expansion valve 7. Within the expansion valve 7, as the refrigerant flows through this flow path, its flow velocity increases, while its pressure and temperature decrease. In the cooling unit 8, the liquid refrigerant, which is low temperature and pressure, flows in from the expansion valve 7 and exchanges heat with the air inside the cooling unit 8. This cools the inside of the cooling unit 8, and the gaseous refrigerant, which is also low temperature and pressure, flows back to the compressor 4 via the refrigerant pipes 9. At this time, the refrigerant pipes 9 that run from each cooling unit 8 to the compressor 4 are routed so that they merge with other refrigerant pipes 9 along the way to th