A movable air duct type mixed flow variable frequency fruit and vegetable precooler and its application

Abstract

The invention discloses a movable air duct type mixed-flow variable-frequency fruit and vegetable pre-cooler and an application thereof. The pre-cooler comprises a mixed flow fan, a distributed air duct, an air channel end surface sealing baffle plate, a temperature control variable-frequency control cabinet, a fruit and vegetable temperature measurement probe, a shield cloth, universal wheels with chasses, and heterogeneous open holes; and the distributed air duct is provided with the heterogeneous open holes, one end of the distributed air duct is connected with the suction opening of the mixed flow fan, the other end is sealed, the distributed air duct is placed in a tunnel formed by a fruit and vegetable packaging box and the shield cloth and parallels to the tunnel, the air channel end surface sealing baffle plate is arranged on the mixed flow fan, the fruit and vegetable temperature measurement probe adopts a probe type PT100 thermal resistor and is inserted into fruits and vegetables to sense the decrease of the temperature of the fruits and vegetables, and a temperature signal transmission line is connected with the temperature control variable-frequency control cabinet. The movable air duct type mixed-flow variable-frequency fruit and vegetable pre-cooler adopts the temperature control variable-frequency control cabinet, so the airflow speed adjustment in different temperature sections of the pre-cooled fruits and vegetables is realized, and the purposes of power consumption reduction and energy saving are achieved.

Description

technical field [0001] The invention belongs to the technical field of fresh-keeping and ventilation of modern cold chain logistics of fruits and vegetables, and relates to a fast, uniform cooling and energy-saving fruit and vegetable pre-cooling device, more specifically, a movable air duct type mixed flow frequency conversion fruit and vegetable pre-cooling machine and its application. Background technique [0002] The most important external factor regulated by the modern cold chain logistics preservation of fruits and vegetables is to provide suitable low temperature, because proper low temperature can not only inhibit the metabolic intensity of fruits and vegetables themselves, but also inhibit the growth and reproduction of pathogenic microorganisms that cause fruit and vegetable diseases. Therefore, in order to maintain the good appearance and internal quality of harvested fruits and vegetables and reduce various losses, the use of the whole cold chain is the most adva...

AI Technical Summary

Problems solved by technology

However, in the actual application of this static pressure box-type differential pressure pre-cooling mode, there are the following three serious defects, which restrict its application scale and application effect: ① It must be matched with a special pre-cooling packaging carton, which is difficult for most users to achieve ;②Using a single axial flow fan or centrifugal fan, it is difficult to meet the requirements of large air volume and high pressure head at the same time, so the gas flow velocity in the fruit and vegetable boxes near the static pressure box is high, while the gas flow velocity in the fruit and vegetable boxes away from the static pressure box is small, resulting in The pre-cooling temperature of the product is not uniform, the required pre-cooling time is increased, and the energy consumption is increased; ③ During the whole pre-cooling period of fruits and vegetables, the fan keeps a certain speed and air volume, which does not meet the requirements of pre-cooling products. Optimized design principles that can use smaller air volumes to facilitate energy-saving operation

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