The core is equipped with an efficient on-board dedicated refrigeration unit, supporting the optional installation of different models of domestic or imported units with equivalent power. The refrigeration temperature can flexibly cover -15 ℃ to 15 ℃, which can achieve the preservation and refrigeration of fruits, vegetables, and dairy products (0 ℃ to 15 ℃), as well as the low-temperature transportation of small frozen goods (-5 ℃ to -15 ℃), adapting to the diverse needs of short distance cold chain transportation. The refrigeration unit operates stably and has high cooling efficiency. It can quickly reach the set temperature and maintain a constant temperature, effectively locking in the freshness of the goods and avoiding deterioration caused by temperature fluctuations during short distance distribution. At the same time, it also takes into account energy saving, and with excellent insulation performance, further reduces energy consumption. It meets the economic needs of small cold chain transportation, and other models of refrigeration units with equivalent power can be selected according to demand to improve configuration flexibility. The refrigerated compartment body is manufactured using negative pressure one-time molding technology, which is a fully sealed sandwich composite structure with excellent insulation performance. It can effectively block external temperature conduction, reduce refrigeration energy consumption, and ensure constant temperature inside the compartment during short distance distribution. The inner and outer wall panels of the cabin are made of FRP fiberglass material, which does not absorb light, has good thermal insulation, strong hardness, and oxidation resistance. The middle insulation layer is made of XPS extruded board, and the thickness of the cabin is 80mm, with excellent sealing performance; The bottom of the compartment is equipped with aluminum alloy anti slip patterned plates, which are easy to clean and anti slip and wear-resistant. The door edge strips are sealed with tight rubber strips, matched with stainless steel door lock hinges, door frames and hinges, completely eliminating cold air leakage. The compartment is equipped with energy-saving LED lighting, which is convenient for checking the inside of the compartment when loading and unloading goods. The top of the compartment is closed and cannot be opened, further enhancing the insulation effect. The weight of the compartment varies from 860-920kg depending on the configuration, and the structure is sturdy and durable.