Horizontal U-shaped fin tube heat exchanger of air source heat pump and fixing mode thereof

Abstract

The invention discloses a novel U-shaped fin tube heat exchanger and a fixing mode thereof. A common U-shaped fin tube heat exchanger is designed into a horizontal U-shaped heat exchanger with an upward opening, a gas collecting tube assembly is horizontally arranged, the gas collecting tube assembly and a dispenser assembly are respectively assembled outside one side of the fin tube heat exchanger, and an end plate I and an end plate II are respectively shaped into a U-shaped structure. The invention has the advantages of ensuring that pressure drops of refrigerants of all refrigerant loops are consistent and wind circulation of each refrigerating system is more uniform, effectively solving the problem of nonuniform defrosting of heat exchangers adopting other fixing modes, and reducing the height of the whole set because an outdoor condensing fan blade and a motor are installed in a space in the U-shaped fin tube heat exchanger.

Description

Technical field [0001] The invention belongs to the technical field of refrigeration and air conditioning. Specifically, it is an air source heat pump horizontal U-shaped finned tube heat exchanger and its fixing method. Background technique [0002] Air source heat pumps are widely promoted and applied in the air-conditioning industry mainly because of their excellent heat exchange performance and the randomness of the installation location. At present, the installation forms of outdoor fin heat exchangers have the following forms: [0003] 1. Vertical installation of U-shaped and L-shaped heat exchangers; [0004] 2. Vertical installation of straight heat exchanger; [0005] 3. V-type heat exchanger; [0006] 4. W-type heat exchanger; [0007] As for the large cooling capacity air-cooled heat pump unit, most of the top air outlet, the fan and the motor are arranged on the top plate of the unit. In this case, the above four heat exchanger installation forms have a height difference b...

AI Technical Summary

Problems solved by technology

However, due to the installation and structural problems of the traditional finned heat exchanger, the melted water generated by the defrosting in the upper part of the heat exchanger flows to the lower part with the action of gravity, and the melted water will not flow clean after the defrosting cycle due to the defrosting cycle. Enter the next heating cycle

This phenomenon is especially obvious in the air source heat pump air conditioning system with the upper air outlet mode. The main reason is that there are differences in the wind speed of the upper, middle and lower parts of the heat exchanger, resulting in uneven heat transfer efficiency and fin heat transfer. The original frosting on the surface of the device is uneven

In this way, the frost on the lower part of the heat exchanger gradually deteriorates over and over again, which cannot effectively improve the heat exchange efficiency, and may even cause liquid return to the compressor due to poor heat exchange effect, resulting in liquid leakage from the compressor.

At the same time, during the defrosting process, some branch pipes (mainly concentrated in the lower part of the heat exchanger) cannot effectively defrost due to thermodynamic reasons during the operation of the refrigerant, while the defrosting of other branch pipes is completed, resulting in a relatively high operating pressure of the system at this time , a tripping protection phenomenon occurs

Images