Finned tube heat sink

　　In air coolers, the key heat-transfer component is the SZL. Coil tube Heat exchangers. The performance characteristics of SZL finned‑tube heat exchangers directly affect the air cooler’s heat‑transfer efficiency, output power loss, and overall external performance; moreover, these finned‑tube heat exchangers account for approximately 50–60% of the equipment’s total cost. Consequently, the performance and economic viability of the entire air cooler hinge on the design and quality of the finned‑tube heat exchanger. According to incomplete statistics, more than fifteen types of finned‑tube heat exchangers are currently in common industrial use. However, based on their manufacturing processes, they can be classified into three main categories: assembled‑type, wound‑type, and continuous‑coil type. This paper focuses on the research and development of winding machines for wound‑type finned‑tube heat exchangers.

　　In recent years, air-cooling technology has been adopted abroad for cooling process fluids in refineries and chemical processes. Due to the rapid advancement and expansion of processing technologies, there is a growing demand for SZL… Coil tube The design of air-cooled radiators imposes stringent requirements, leading to the development of a variety of production equipment for finned-tube radiators. Industrial nations such as the United Kingdom, the Federal Republic of Germany, Poland, and the United States have successively developed their own finned-tube radiator winding machines and obtained corresponding patents.

　　The improved SZL finned-tube radiator winding machine features the following characteristics: 1. It can perform winding operations on both elliptical and circular‑section tubes; 2. The number of fin spirals may be either single‑ended or long‑tail. Under the same tube rotational speed, this allows the winding rate to increase by a factor of 1 to several times (of course, the number of spirals cannot be increased indefinitely, as this would make the equipment overly complex).

　　Because several fin tubes move simultaneously, the forces acting on the tube are balanced, allowing for the design of high‑speed sections with minimal or no mechanical assistance. The machine is designed with a specialized component whose function is to pre‑bend the aluminum strip into an obtuse angle greater than 90° before it is wound around the tube; during winding, it is then bent to form a right angle. Clearly, the designer’s intention is to accomplish the right‑angle bending of the fins in two steps, thereby reducing internal stresses, preventing wrinkling, and ensuring secure adhesion of the fins to the tube surface, ultimately enhancing the heat‑dissipation performance of the finned‑tube radiator.

　　Finned tubes come in various forms and materials and are commonly used for industrial heating, cooling, and other applications. They include single-metal finned tubes, steel–aluminum composite extruded finned tubes, steel–aluminum composite wound finned tubes, armored finned tubes, and embedded finned tubes, which increase the heat‑dissipation surface area, enhance conversion efficiency, and reduce costs.

　　1. Extruded aluminum finned tube, which uses an aluminum base tube (the base tube may be carbon steel, stainless steel, or copper). The fins are formed by extrusion, and the fin base is tightly bonded to the outer wall of the tube, resulting in a high heat transfer coefficient and excellent heat exchange performance.

　　2. The finned tube is constructed by helically winding a steel strip around a base tube; the steel strip may be made of copper, aluminum, carbon steel, or stainless steel. This type… Coil tube It is suitable for a wide range of applications, such as stainless steel spiral-wound tubes, and can be used in scenarios with stringent quality requirements. Its drawback is that the steel strip does not fully conform to the outer wall of the base tube; instead, the stress is applied perpendicular to the tube’s surface, resulting in a slightly lower heat transfer coefficient.