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CN-121993933-A - Refrigeration cycle device

CN121993933ACN 121993933 ACN121993933 ACN 121993933ACN-121993933-A

Abstract

The invention provides a refrigeration cycle device, which has high resistance of a refrigerant pipe relative to vibration and suppresses manufacturing cost. An outdoor unit of a refrigeration cycle device provided with a compressor, a heat source side heat exchanger, a pressure reducer, a gas side stop valve, and a liquid side stop valve is provided with a first metal member disposed at least in a gas side refrigerant circuit connecting the gas side stop valve and the heat source side heat exchanger via the compressor, a second metal member disposed at least in a liquid side refrigerant circuit connecting the heat source side heat exchanger and the liquid side stop valve via the pressure reducer, a first copper pipe joined to the first metal member, and a second copper pipe joined to the second metal member, wherein the first and second metal members are made of iron, iron alloy, or stainless steel, the first copper pipe is made of a copper alloy containing no alloy element, and the second copper pipe is made of a copper alloy containing a lower content of alloy element than the first copper pipe.

Inventors

  • ISHIGAMI TATSUYA

Assignees

  • 日立江森自控空调有限公司

Dates

Publication Date
20260508
Application Date
20241230
Priority Date
20241105

Claims (14)

  1. 1. An outdoor unit of a refrigeration cycle apparatus including a compressor, a heat source side heat exchanger, a pressure reducer, a gas side check valve, and a liquid side check valve, the outdoor unit comprising: a first metal member disposed at least in a gas-side refrigerant circuit connecting the gas-side check valve and the heat source-side heat exchanger via the compressor; a second metal member disposed at least in a liquid-side refrigerant circuit connecting the heat source-side heat exchanger and the liquid-side check valve via the pressure reducer; a first copper pipe joined to the first metal member, and A second copper pipe joined to the second metal member, The first metal member and the second metal member are made of iron, iron alloy or stainless steel, The first copper pipe is made of copper alloy containing alloy elements, The second copper pipe is made of copper containing no alloy element or a copper alloy having a lower content of the alloy element than the first copper pipe.
  2. 2. The outdoor unit of the refrigeration cycle apparatus according to claim 1, wherein, The first metal member is a refrigerant pipe, an oil separator, a part of the oil separator, a four-way valve, or a part of the four-way valve, The second metal member is an outdoor unit of the refrigeration cycle apparatus serving as a refrigerant pipe.
  3. 3. An outdoor unit of a refrigeration cycle apparatus including a compressor, a heat source side heat exchanger, a pressure reducer, a gas side check valve, and a liquid side check valve, the outdoor unit comprising: a first metal member disposed at least in a gas-side refrigerant circuit connecting the gas-side check valve and the heat source-side heat exchanger via the compressor; A refrigerant pipe disposed at least in a liquid-side refrigerant circuit connecting the heat source-side heat exchanger and the liquid-side check valve via the pressure reducer, and A first copper pipe joined to the first metal member, The first metal member is made of iron, iron alloy or stainless steel, The first copper pipe is made of copper alloy containing alloy elements, The refrigerant pipe is made of copper containing no alloy element or a copper alloy having a lower content of the alloy element than the first copper pipe.
  4. 4. An outdoor unit of a refrigeration cycle apparatus according to claim 3, wherein, The first metal member is a refrigerant pipe, an oil separator, a metal member constituting a part of the oil separator, a four-way valve, or a metal member constituting a part of the four-way valve.
  5. 5. The outdoor unit of the refrigeration cycle apparatus according to any one of claims 1 to 4, wherein, The alloy element is one or more of P, co, sn, zn, ni, zr and Fe.
  6. 6. An outdoor unit of a refrigeration cycle apparatus according to claim 1 or 3, wherein, The first copper pipe is shorter than a refrigerant pipe connected to the first copper pipe.
  7. 7. An outdoor unit of a refrigeration cycle apparatus according to claim 1 or 3, wherein, The first metal member is a refrigerant pipe, The thickness of the first copper pipe is thicker than the thickness of the refrigerant pipe as the first metal member.
  8. 8. An outdoor unit of a refrigeration cycle apparatus according to claim 1 or 3, wherein, The first metal member is a refrigerant pipe, The second metal member is a refrigerant pipe, The thickness of the first copper pipe is thicker than the thickness of the refrigerant pipe as the first metal member and the thickness of the refrigerant pipe as the second metal member.
  9. 9. An outdoor unit of a refrigeration cycle apparatus according to claim 1 or 3, wherein, Comprises at least one of an accumulator, an oil separator and a four-way valve, The first metal member is a refrigerant pipe connected between the compressor and the accumulator, between the compressor and the oil separator, or between the compressor and the four-way valve, The compressor is a scroll compressor or a twin-rotation compressor.
  10. 10. The outdoor unit of the refrigeration cycle apparatus according to any one of claims 1 to 4, wherein, The content of the alloy element in the first copper pipe is lower than the content of the alloy element in the first metal member.
  11. 11. An outdoor unit of a refrigeration cycle apparatus according to claim 1 or 3, wherein, The first metal member is a refrigerant pipe, The first copper pipe is connected to a copper member forming the refrigerant circuit, The copper member is made of copper containing no alloy element or a copper alloy having a lower content of the alloy element than the first copper tube.
  12. 12. The outdoor unit of the refrigeration cycle apparatus according to claim 11, wherein, The refrigerant pipe and the copper member are overlapped with each other through the first copper pipe.
  13. 13. A refrigeration cycle device is provided with an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a compressor, a heat source side heat exchanger, a pressure reducer, a gas side stop valve and a liquid side stop valve, The refrigeration cycle device is characterized by comprising: a first metal member disposed at least in a gas-side refrigerant circuit connecting the gas-side check valve and the heat source-side heat exchanger via the compressor; A second metal member disposed at least in a liquid-side refrigerant circuit connecting the heat source-side heat exchanger and the liquid-side check valve via the pressure reducer, or in a usage-side refrigerant circuit as a refrigerant circuit incorporated in the indoor unit; a first copper pipe joined to the first metal member, and A second copper pipe joined to the second metal member, The first metal member and the second metal member are made of iron, iron alloy or stainless steel, The first copper pipe is made of copper alloy containing alloy elements, The second copper pipe is made of copper containing no alloy element or a copper alloy having a lower content of the alloy element than the first copper pipe.
  14. 14. A refrigeration cycle device is provided with an outdoor unit and an indoor unit, wherein the outdoor unit is provided with a compressor, a heat source side heat exchanger, a pressure reducer, a gas side stop valve and a liquid side stop valve, The refrigeration cycle device is characterized by comprising: a first metal member disposed at least in a gas-side refrigerant circuit connecting the gas-side check valve and the heat source-side heat exchanger via the compressor; A refrigerant pipe disposed at least in a liquid-side refrigerant circuit connecting the heat source-side heat exchanger and the liquid-side stop valve via the pressure reducer, or in a usage-side refrigerant circuit as a refrigerant circuit incorporated in the indoor unit, and A first copper pipe joined to the first metal member, The first metal member is made of iron, iron alloy or stainless steel, The first copper pipe is made of copper alloy containing alloy elements, The refrigerant pipe is made of copper containing no alloy element or a copper alloy having a lower content of the alloy element than the first copper pipe.

Description

Refrigeration cycle device Technical Field The present invention relates to a refrigeration cycle apparatus including a refrigerant pipe assembly in which a copper-based refrigerant pipe is joined to an iron-based refrigerant pipe such as stainless steel, and more particularly to an outdoor unit of the refrigeration cycle apparatus. Background Refrigerating air-conditioning equipment such as air-conditioning equipment, refrigeration equipment, and refrigerator equipment includes a refrigerant circuit for circulating a refrigerant to perform a refrigeration cycle. The refrigerant circuit is connected to devices such as a compressor, a condenser, a pressure reducer, and an evaporator via refrigerant pipes. Conventionally, the refrigerant piping is made of copper such as phosphorus deoxidized copper. In addition, the heat transfer pipe, oil separator, valve, etc. of the heat exchanger are often made of copper. Patent document 1 describes a copper alloy tube for heat exchangers that has excellent bending workability and heat resistance compared to conventional phosphorus deoxidized copper. Co, sn, zn, ni, P and the like are positively added to the copper alloy tube for heat exchangers. In this copper alloy tube for heat exchangers, the mechanical properties are improved by precipitation strengthening and solid solution strengthening due to the addition of alloying elements. Prior art literature Patent document 1, patent publication 5111922 In recent years, the price of copper has increased, and the material costs of the refrigerant piping and equipment forming the refrigerant circuit have increased. Therefore, the cost can be suppressed by converting the material of the refrigerant piping and equipment forming the refrigerant circuit from a copper system such as phosphorus deoxidized copper to an iron system such as stainless steel. However, there are several problems in terms of performance and construction in order to completely convert the materials of the refrigerant piping and equipment forming the refrigerant circuit into iron-based metals. Therefore, it is currently assumed that copper-based refrigerant pipes and equipment used in the past coexist with iron-based refrigerant pipes and equipment such as stainless steel. When iron-based refrigerant piping such as stainless steel and equipment coexist, it is necessary to appropriately join these dissimilar metals to each other. However, it is known that the bonding of copper to stainless steel or the like is not easy due to the difference in physical properties and the presence of an oxide film. It is desirable that these joints are not performed in the atmosphere but rather in an environmentally controlled oven. On the other hand, copper is desired to be easily joined to each other in facilities and sites which have been conventionally used. In order to solve such a problem, a countermeasure has been proposed in which devices forming a refrigerant circuit of a refrigeration cycle apparatus are connected to each other by a refrigerant piping assembly. The refrigerant pipe assembly is a member in which copper pipes made of copper or copper alloy are joined to iron-based refrigerant pipes. The refrigerant pipe assembly is obtained by joining the ends of copper pipes to the ends of iron-based refrigerant pipes by brazing in a furnace. When the refrigerant piping assembly is manufactured in advance in an appropriate environment and then connected to the equipment by the original equipment or the like, a low-cost refrigerant circuit in which the iron-based refrigerant piping is appropriately joined can be easily formed. However, even when such measures are taken, there is a problem concerning strength of the copper pipe portion of the refrigerant piping assembly. In the refrigeration cycle apparatus, the vibration of the equipment during operation affects the copper pipe portion in the vicinity of the compressor, the valve accompanying the switching operation, and the like. If the strength of the copper pipe is low, fatigue failure may occur. The repeated stress caused by vibration causes the refrigerant piping assembly connected to the equipment to fall off or the copper pipe to be partially broken. In particular, the refrigerant piping assembly is formed by brazing in a furnace at a high temperature of about 800 to 1200 ℃ for a long time of about 20 to 30 minutes, and therefore the copper pipe portion is greatly affected by heat. The crystal grains are coarsened, and the tensile strength and fatigue strength tend to be lowered. In the vicinity of a compressor that generates continuous vibration, a valve that generates intermittent vibration at the time of switching, and the like, if conventional phosphorus deoxidized copper or the like brazed in a supply furnace is used, the risk of causing fatigue failure becomes higher. Disclosure of Invention Accordingly, an object of the present invention is to provide a refrigeration cycle apparatus in which the refrigera