CN-121993929-A - Outdoor unit and refrigeration cycle device

Abstract

The invention provides an outdoor unit and a refrigeration cycle device having a branch pipe capable of suppressing strength reduction even if brazing is performed in a furnace. An outdoor unit provided with an outdoor heat exchanger (34) having a copper heat transfer tube, and a branch pipe (41) comprising a main pipe (42) made of iron or an iron alloy or stainless steel, and a branch pipe (43) branching from the main pipe (42) and connected to the heat transfer tube (40), wherein at least a part of the branch pipe (43) has a copper alloy pipe containing at least one alloy element selected from cobalt, tin, zinc, nickel, zirconium and iron.

Inventors

• ISHIGAMI TATSUYA

Assignees

• 日立江森自控空调有限公司

Dates

Publication Date

20260508

Application Date

20241223

Priority Date

20241105

Claims (7)

1. 1. An outdoor unit provided in a refrigeration cycle apparatus, comprising: a heat exchanger having a heat transfer tube made of copper, and A branch pipe composed of a main pipe made of iron or iron alloy or stainless steel and a branch pipe branched from the main pipe and connected to the heat transfer pipe, At least a part of the branch pipe is provided with a copper alloy pipe, and the pipe contains more than 1 alloy element selected from cobalt, tin, zinc, nickel, zirconium and iron.
2. 2. The outdoor unit of claim 1, wherein, The heat transfer pipe does not contain the alloy element, or the alloy element content of the heat transfer pipe is lower than that of the branch pipe.
3. 3. An outdoor unit provided in a refrigeration cycle apparatus, comprising: a heat exchanger having a heat transfer tube made of copper, and A branch pipe composed of a main pipe made of iron or iron alloy or stainless steel and a branch pipe branched from the main pipe and connected to the heat transfer pipe, At least a part of the branch pipe is provided with a copper alloy pipe, the pipe comprises more than 1 alloy element selected from phosphorus, cobalt, tin, zinc, nickel, zirconium and iron, The heat transfer pipe does not contain the alloy element, or the alloy element content of the heat transfer pipe is lower than that of the branch pipe.
4. 4. An outdoor unit according to claim 1 or 3, wherein, The branch pipe comprises a pipe made of iron or iron alloy or stainless steel, The iron or iron alloy or stainless steel pipe is disposed between the main pipe and the copper alloy pipe.
5. 5. An outdoor unit according to claim 1 or 3, wherein, The content of the alloy element contained in the copper alloy pipe is lower than the content of the alloy element contained in the main pipe.
6. 6. A refrigeration cycle device provided with an outdoor unit, characterized in that, The outdoor unit includes: a heat exchanger having a heat transfer tube made of copper, and A branch pipe composed of a main pipe made of iron or iron alloy or stainless steel and a branch pipe branched from the main pipe and connected to the heat transfer pipe, At least a part of the branch pipe is provided with a copper alloy pipe, and the pipe contains more than 1 alloy element selected from cobalt, tin, zinc, nickel, zirconium and iron.
7. 7. A refrigeration cycle device provided with an outdoor unit, characterized in that, The outdoor unit includes: a heat exchanger having a heat transfer tube made of copper, and A branch pipe composed of a main pipe made of iron or iron alloy or stainless steel and a branch pipe branched from the main pipe and connected to the heat transfer pipe, At least a part of the branch pipe is provided with a copper alloy pipe, the pipe comprises more than 1 alloy element selected from phosphorus, cobalt, tin, zinc, nickel, zirconium and iron, The heat transfer pipe does not contain the alloy element, or the alloy element content of the heat transfer pipe is lower than that of the branch pipe.

Description

Outdoor unit and refrigeration cycle device Technical Field The present invention relates to an outdoor unit and a refrigeration cycle apparatus. Background In recent years, copper has been increasingly demanded as electronic devices are popularized, and the price of copper has increased. Copper is excellent in heat conductivity, workability, and corrosion resistance, and is therefore used for refrigerant piping of refrigeration cycle devices such as air conditioning devices, but the price increases to compress the benefits, and therefore other materials are being studied to replace copper. For example, as a heat transfer tube for a heat exchanger of an air conditioner, there has been proposed a heat transfer tube using a copper alloy tube containing cobalt (Co), tin (Sn), zinc (Zn), nickel (Ni), and phosphorus (P), and a heat transfer tube as a heat exchanger of an air conditioning system, wherein a main header of a header tube connected to a copper tube group is made of a stainless steel tube (for example, refer to patent documents 1 and 2). Prior art literature Patent literature Patent document 1 Japanese patent No. 5111922 Patent document 2 Japanese patent application laid-open No. 2024-515018 Disclosure of Invention Problems to be solved by the invention As described in patent document 2, when a main header (main pipe) of a header (branch pipe) connected to a heat exchanger is made of a stainless steel pipe and a subassembly including a branch pipe branched from the main pipe and a pipe connected to a distal end of the main pipe is manufactured by brazing in a furnace, the copper pipe is exposed to a high-temperature environment at a temperature of about 800 to 1200 ℃ for a long period of time, and crystals of the copper pipe portion coarsen, and the tensile strength and fatigue strength are significantly reduced. When the refrigerant temperature changes rapidly, the main pipe expands or contracts, for example, during the defrosting operation or the heating operation in a low-temperature environment. In this case, there is a difference in expansion or contraction between the main pipe and the branch pipe, and a large stress may be generated in the branch pipe. Therefore, when copper pipes having reduced strength due to brazing in a furnace are used for the branch pipes, there is a possibility that the copper pipes cannot withstand the stress generated by the expansion or contraction, and the copper pipes are damaged. Accordingly, it is desirable to provide an outdoor unit and a refrigeration cycle apparatus having a branch pipe that can suppress a decrease in strength even when brazing is performed in a furnace. Means for solving the problems In view of the above problems, the present invention provides an outdoor unit provided in a refrigeration cycle apparatus, comprising a heat exchanger having a heat transfer pipe made of copper, and a branch pipe composed of a main pipe made of iron or an iron alloy or stainless steel, and a branch pipe branched from the main pipe and connected to the heat transfer pipe, wherein at least a part of the branch pipe has a pipe made of a copper alloy, and the pipe contains at least one alloy element selected from the group consisting of cobalt, tin, zinc, nickel, zirconium, and iron. The outdoor unit includes a heat exchanger having a heat transfer pipe made of copper, and a branch pipe composed of a main pipe made of iron or iron alloy or stainless steel and a branch pipe branched from the main pipe and connected to the heat transfer pipe, wherein at least a part of the branch pipe has a pipe made of copper alloy containing at least 1 or more alloy elements selected from cobalt, tin, zinc, nickel, zirconium and iron. Effects of the invention According to the present invention, it is possible to provide an outdoor unit and a refrigeration cycle apparatus having a branch pipe that can suppress a decrease in strength even when brazing is performed in a furnace. Drawings Fig. 1 is a diagram showing a configuration example of an air conditioner as an example of a refrigeration cycle apparatus. Fig. 2 is a diagram showing in detail a structure around an outdoor heat exchanger constituting an outdoor unit. Fig. 3 is a diagram showing a configuration example of the branch pipe. Fig. 4 is an S-N diagram showing the results of the bending fatigue test. Symbol description The air conditioner comprises an air conditioner, an indoor unit, an outdoor unit, an indoor heat exchanger, an indoor fan motor, a compressor, a liquid storage device, a four-way valve, an outdoor expansion valve, an outdoor heat exchanger, an outdoor fan, a 37 control device, a 40 heat transfer pipe, a 41 gas header, a 42 main pipe, a 43 branch pipe, a 44 refrigerant pipe, a 45 connecting pipe, a 46 connecting pipe and a 47 liquid header. Detailed Description The refrigeration cycle apparatus is an apparatus that circulates a refrigerant in a system while changing the pressure and state of the refrigerant as