RU1793173C - Foodstuffs freezing refrigerating chamber - Google Patents

Abstract

Usage: in refrigeration engineering, Summary of the invention: a refrigerating chamber comprises a heat-insulated casing with suspended tracks, a vertical partition installed in the casing to form a pre-cooling compartment including a first branch of the suspended track. The partition is hollow and communicates with air coolers. Its wall facing the pre-cooling compartment has openings for air outlet, and the opposite wall is solid. 1 silt

Description

The invention relates to refrigeration

those

Nike.

Known refrigerator for freezing food products containing

a thermally insulated housing with

suspended paths, a vertical partition installed in the housing to form the pre-cooling compartment, including the first branch of the suspension path, locking devices, air coolers, air ducts.

Due to the fact that, depending on the age of the 1st time of delivery of different batches of meat ps entering the freezer, the mass of ps carcasses is variable, and the conditions of the freezing mode do not take these changes into account and are constant during the freezing cycle, such a chamber with possible fluctuations in the mass of half carcasses from 30 to 130 kg, it operates in a non-optimal mode. This leads to an unjustified overcooling of meat and an excessive consumption of cold at

small masses of half carcasses or to an increase in shrinkage of meat and its insufficient cooling with large masses of half carcasses. In the end result, due to the impossibility of controlling the duration of freezing and the intensity of cooling depending on the mass of half carcasses, the efficiency of the process of freezing meat in the freezer decreases, and the amount of food loss from drying increases.

The aim of the invention is to increase productivity and reduce drying of products by enhancing heat transfer and freezing the surface layer of products at the beginning of refrigeration processing.

The drawing schematically shows the proposed refrigeration chamber, top view.

The refrigerator compartment comprises a heat-insulated casing 1 with overhead tracks 2 made in the form of a serpentine.

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Oj

A hydraulic rod follower (not shown) is used to move the meat carcasses on the roller hooks. To prevent cold losses from the chamber 1, the doorway 3 is equipped with a gateway A. The chamber contains a vertical partition 5 installed in the housing to form a pre-cooling compartment 6, including the first branch of the suspension path 2. Air coolers 7 are installed in the working volume of the housing 1. The vertical partition 5 is made hollow, in communication with air coolers 7. Wall 8 of partition 5 facing the pre-cooling compartment 6 has openings 9 for air outlet, and the opposite wall 10 is solid. In the cavity of the partition there is a device for adjusting the air velocity according to

V-: (+3.402

/(9

, 7

 1,998-10 3) /

10 V

where M is the mass of the product, kg;

t is the duration of freezing, h;

t is the air temperature in the chamber, ° C.

The refrigerator works as follows.

Half-carcasses of meat enter the working volume of the chamber along the suspension path 2 through the doorway 3 after passing through the lock 4.

The temperature regime in the chamber is created using air coolers 7, which receive heat influx from the meat and through the heat-insulated casing 1. At the beginning of the route of the meat through the chamber, it passes along the first branch of the suspension path in compartment 6, and then through the remaining branches, which are separated by a partition 5. Warm meat carcasses in compartment 6 are blown cold

air coming out of the outlet openings 9, walls 8 ,. Cold air enters the partition 5 through the flow regulator from the air coolers 7. In the initial stage of freezing, heat flows from the surface layers of meat are significantly removed due to intensive blowing of it and exhaust openings 9. After passing the first branch of the suspension path, the meat enters the second branch ,

on which further freezing occurs and in this case there is additional heat removal from the meat due to radiant heat exchange with the surface of the wall 10 of the partition 5.

Providing optimal combinations of the parameters of the freezing mode leads to a reduction in product drying by 11-, 16% compared to the known device (one of the advantages of the proposed chamber is the presence of radiant heat exchange between the half carcasses and the flat plate of the partition.

Claims (1)

Formula for Finding A food freezing refrigerator containing a heat-insulated casing with overhead rails, a vertical partition installed in the casing to form a pre-cooling compartment including a first branch of the overhead rails, air locks, air coolers, air ducts, that, in order to increase productivity and reduce drying of products due to intensification of heat transfer and freezing of the surface layer of products at the beginning of refrigeration processing, the vertical partition is hollow, in communication with air coolers, its wall facing the pre-cooling compartment has openings for air outlet, and the opposite wall is made Solid, while in the cavity of the partition a device for adjusting the air flow rate according to the established relationship is placed. 89-6