Double swirling counter flow type heat exchanger with rib and coiled spiral flat tube

Abstract

The invention relates to a rib disc screw flat-tube dual cyclone reflux heat exchanger, which comprises a heat exchange tube, a case, a cylinder cover, and an inlet and an outlet of the liquid inside the tube. It is characterized in that: said heat exchange tube is a multiple-inner channel flat tube whose outer side has ribs to be coiled into flat tube screw disc to be sealed inside the chamber formed by the heat exchange case and the case cover, therefore, it can form a fluid screw channel inside the tube and a screw channel of another fluid outside the tube; it uses the rib height to control the distance of outer channel and said two fluids flow reversely. The invention can combine the advantages of different heat exchangers with high heat exchanger property, tight structure, easy production, and lower cost, and it can apply the water condenser whose water flux is lower and needs large temperature rise.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers, in particular to a double-swirl counter-flow liquid-liquid heat exchanger with ribbed disc-shaped spiral flat tubes. Background technique [0002] A large amount of hot water at 45-55°C is needed in life. At present, domestic hot water is mostly provided by electric water heaters, and hot water required by hotels and restaurants is mostly provided by oil-fired boilers. It is recognized that the use of heat pump water heaters to produce hot water has obvious energy-saving effects, and its key equipment is the water condenser. The water condenser of the heat pump water heater requires that the cooling water can obtain a large temperature rise. In winter, the tap water temperature is about 5-7°C, the domestic water temperature is 45-55°C, and the temperature rise needs to reach 40-50°C. [0003] According to "Heat Transfer" (Higher Education Press, written by Yang Shiming and Tao Wenquan), ...

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Problems solved by technology

[0007] The plate heat exchanger uses a thin plate to separate the channels between the cold and hot fluids. It is in the form of double wave counterflow. The flow channel is very narrow and has a high area and volume heat transfer coefficient. It is relatively compact, but the mold is complicated and expensive.

The plate-fin heat exchanger is also welded with corrugated fins between the plates. The heat transfer area per unit volume is large. It is a compact high-efficiency heat exchanger, but the manufacturing process is complicated, and it is only suitable for large air-air heat exchangers.

Because the distance between the water channel and the refrigerant channel of the plate heat exchanger is almost equal, and the minimum channel spacing of the plate-fin type is also 4 mm, the flow velocity of the water channel is extremely small under the condition of large temperature rise, and the thermal coefficient is greatly reduced, so that the plate-type and plate-fin type The advantages of high-efficiency heat exchange of heat exchangers cannot be brought into play, so plate and plate-fin heat exchangers are difficult to choose as condensers for heat pump water heaters

[0008] It can be seen from the above that if the existing heat exchanger is used as a water condenser with a large water temperature rise, the heat transfer efficiency may decrease due to the low water flow rate; danger; or the heat transfer power per unit volume is small

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