Equipment piping connection structure, refrigerant equipment, and refrigeration cycle system

The brazing connection structure with a plating layer and lower-melting-point brazing materials simplifies the connection of stainless steel refrigerant pipes in air conditioners by reducing labor and ensuring airtight joints through furnace brazing, addressing the complexity of stainless steel brazing in air conditioners.

JP2026102937APending Publication Date: 2026-06-23SAGINOMIYA SEISAKUSHO INC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SAGINOMIYA SEISAKUSHO INC
Filing Date
2026-04-01
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

The use of stainless steel refrigerant pipes in air conditioners requires complex and labor-intensive brazing processes due to the need to remove oxide films, complicating the connection with equipment bodies and other pipes.

Method used

A brazing connection structure is employed where a plating layer is applied to the stainless steel refrigerant pipes, using brazing materials with lower melting points than the plating layer, allowing for furnace brazing that minimizes the impact on the plating layer and reduces the workload, while ensuring airtight joints.

Benefits of technology

This method allows for efficient brazing of stainless steel refrigerant pipes to equipment bodies and other pipes with reduced labor, using furnace brazing to remove oxide films effectively, thereby simplifying the connection process and maintaining a high-quality joint.

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Abstract

This invention provides a refrigerant piping connection structure, refrigerant equipment, and refrigeration cycle system that allow stainless steel refrigerant piping to be brazed to the main unit of the equipment or other piping while reducing the workload. [Solution] In a refrigerant equipment 10a with a piping connection structure, the melting point of the brazing material 17 used for brazing the equipment body 15 to one end 161 of a stainless steel refrigerant pipe 16 is lower than the melting point of the plating layer 18 on the outer peripheral surface 163a of the other end 162 of the refrigerant pipe 16. The end of the second refrigerant pipe is joined to the other end 162 of the first refrigerant pipe, which is the refrigerant pipe 16. The opposing surface of the second refrigerant pipe to the first refrigerant pipe is formed of a metal of the same material or a similar material as the plating layer 18. The brazing material 17 used to braze the one end 161 of the first refrigerant pipe to the equipment body 15 is the first brazing material. The second refrigerant pipe is brazed to the other end 162 of the first refrigerant pipe using the second brazing material, and the melting point of the second brazing material is lower than the melting point of the first brazing material.
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