Commercial freezer structure

From the structure, the freezer generally includes the box, the refrigeration system, and the electrical system.

The basic function of the refrigeration system freezer is to refrigerate and keep the proper low temperature in the box. The refrigeration system generally consists of four basic components: compressor, condenser, capillary or thermal expansion valve, and evaporator. Refrigerant is a liquid that can boil at low temperature under low pressure. It absorbs heat when boiling. The refrigerant circulates continuously in the refrigeration system. The compressor increases the gas pressure of the refrigerant, resulting in liquefaction conditions. It condenses and liquefies through the condenser to release heat. Then it reduces the pressure and temperature through the capillary tube, and then boils and vaporizes through the evaporator to absorb heat. In addition, the current development uses refrigeration diodes without complicated mechanical devices, but the efficiency is poor, used in small commercial freezers. The original freezer with F12 (Freon 12) as a refrigerant, because it will destroy the ozone layer of the atmosphere, now switch to R600a/R134a/R404 and other refrigerants. In addition, due to the inevitable presence of some moisture and impurities in the system, so the capillary inlet end is generally equipped with a dry filter.

Electrical system electric commercial freezers use electricity as the main energy source, rely on electric motors to drive compressors or refrigeration diodes, and are generally equipped with relay protectors and thermostats. According to different starting methods, the commercial freezer motor using compressor is divided into resistance phase starting type, capacitor starting type and capacitor starting capacitor operation type. The motor of the fully enclosed compressor is installed inside the refrigeration system. It is in contact with refrigerant and refrigerating oil for a long time, and bears pressure, high temperature, etc., so it must be resistant to refrigerant and refrigerating oil, stable electrical performance, high temperature resistance, vibration and impact resistance, There are requirements for large starting torque and keeping clean and free of moisture.

Box The box is composed of structural materials and thermal insulation materials to form a space to store food and prevent internal and external heat transfer. The box generally includes an outer box, an inner container and an insulation layer. Commercial freezer liner (lining) is generally made of ABS or HIPS plate by vacuum forming, the thickness is less than 1mm, white, smooth. Polyurethane foam is widely used in thermal insulation materials, which has excellent thermal insulation performance and little change in thermal conductivity after long-term use.

　　Commercial freezer refrigeration principle

Vaporization (liquid to vapor) is heat absorption; liquefaction (vapor to water) is heat release, both commercial freezers and air conditioners have the same working principle as follows (low temperature and low pressure) refrigerant (gas) → compressor → (liquefied) liquid refrigerant (high temperature and high pressure) → radiator (the surface of the commercial freezer releases heat) → liquid refrigerant (low temperature and high pressure) → capillary tube → evaporator in the commercial freezer (copper tube around the inner wall of the box) vaporizes, that is, absorbs heat → the temperature in the commercial freezer will decrease → (Gasification) Refrigerant (Low Temperature and Low Pressure) → The compressor thus moves the heat in the box from the multiple cycle to the refrigerant as the price quality.

　　Commercial freezer preparation before use

1. Check whether the placement position of the commercial freezer meets the requirements.

2. The commercial freezer shall check whether the accessories are complete according to the packing list. Read the product instruction manual in detail and conduct a comprehensive inspection according to the requirements of the instruction manual.

3. Check whether the power supply voltage of the commercial freezer meets the requirements. The power supply used should be 220V,50Hz single-phase AC power supply. During normal operation, the voltage fluctuation is allowed to be between 187-242V. If the fluctuation is large or fluctuates, it will affect the normal operation of the compressor and even burn the compressor.

4, commercial freezer application single-phase three-hole check seat, separate wiring. If there is no grounding device, the grounding wire shall be installed. When setting the grounding wire, the water and gas pipes cannot be used as the grounding wire, nor can they be connected to the telephone line and the lightning rod.

5. Do not damage the insulation layer of the power cord in the commercial freezer, do not press the wire heavily, and do not change or lengthen the power cord at will.

6. After the commercial freezer is checked to be correct, let the electric commercial freezer and freezer stand for half an hour, turn on the power supply, and carefully listen to whether the sound of the compressor during startup and operation is normal, whether there is the sound of pipelines hitting each other, if the noise is too large, check whether the products are placed smoothly, whether the pipelines are in contact, and make corresponding adjustments. If there is a loud abnormal sound, immediately cut off the power supply and contact the professional repair personnel.

7, commercial freezer electric commercial freezer, freezer before storing food, first no-load operation for a period of time, such as the temperature in the box decreases, then put in food, storage of food can not be too much, try to avoid electric commercial freezer, freezer full load work for a long time.

The power consumption of the freezer is divided into rated power consumption and actual power consumption. The rated power consumption is the electric energy consumed by the freezer in a stable operation state (the average temperature of the refrigerator compartment is 5 ℃ and the maximum temperature of the freezer compartment is -18 ℃) when the ambient temperature is 25 ℃. The actual power consumption is the electric energy consumed by the commercial freezer in actual use. The actual power consumption of commercial freezers is sometimes higher than the rated power consumption and sometimes lower than the rated power consumption. The actual power consumption varies with the environment of the freezer, the amount of food stored, the control temperature in the freezer, the number of times and the length of time the door is opened. The higher the ambient temperature, the more food stored, the lower the temperature controlled in the freezer, the more times the door is opened, and the longer the power consumption of the commercial freezers. On the contrary, the power consumption is smaller.