The general cold storage is mainly composed of a compressor, a condenser and an evaporation tube. According to the way of the evaporation tube device, it can be divided into direct cooling and indirect cooling . Direct cooling installs the evaporation tube in the cold storage room. When the liquid coolant passes through the low-pressure evaporation tube, it directly absorbs the heat in the warehouse and cools down. The indirect cooling is performed by the air blower to suck the air in the warehouse into the air cooling device, and the air is heated by the evaporation tube spiraled in the cooling device, and then sent into the storage to cool down. The advantage of air cooling is that it cools quickly and the temperature inside the chamber is relatively uniform. If this article is helpful to you, please click on the "good-looking" support in the lower right corner of the article.

1. Daily maintenance of frozen and cold storage

1. Check and confirm whether the voltage of the power supply meets the requirements. The voltage should be 380V±10% (three-phase four-wire). Whether the protection function of the main power gate is normal and effective.

2. The electrical equipment of the cold storage equipment should be protected from moisture, so as to avoid electric shock and electric shock.

3. The electrical equipment maintenance of the cold storage equipment should be operated by the electrician or the electrician who knows the refrigeration knowledge. Any maintenance must be cut off to ensure safety.

4. The hinges, handles and door locks of the door of the cold storage should be regularly added with lubricating oil according to the actual use.

5. The temperature of the refrigerated and freezer should be recorded regularly.

6. When taking the item, the cold storage door should be closed in time, and the light should be turned off and closed after the item is taken out. To reduce the cold air to run away, affecting the temperature is not normal

7. Don't forget to close the door after entering and exiting to avoid leakage and condensation, frosting and icing.

8. Minimize the number of cold storage door switches to prevent hot air intrusion and reduce the amount of frost in the air cooler.

9, the items loaded into the library can not contain too much water, to prevent water from seeping into the bottom of the library, so as not to affect the life of the cold storage.

10. There should be a cold air passage in the warehouse, and there must be a certain gap between the front and rear of the air cooler. The air cooler should not be stacked with the same height as the air cooler to avoid affecting the cooling effect. Do not touch the sewer line when stocking items.

11. The cold storage should be cleaned, cleaned and disinfected regularly, cleaned once a day, cleaned once every half month, and kept clean and odor-free [source refrigeration encyclopedia public number]. The sewer should be cleaned in time to prevent blockage.

In addition to the above considerations, an arrangement must be made for cleaning to prevent loss. It is also necessary to arrange a thorough cleaning once a month. Carefully clean the water in addition to the cold storage, and also use water to flush the frosted and frozen parts in the warehouse to prevent the water outlet and the air outlet fins from becoming clogged, which may cause the wind to circulate. loss.

12. When cleaning, be careful not to get the water on the fan motor, and pay attention to safety and keep a certain distance to prevent the blade from being scratched.

13. If the air humidity is too large, the defrosting interval is long, and the storage temperature is not normal, all of these will cause the frost layer on the evaporator to thicken and the temperature of the reservoir will not drop. At this time, defrosting (defrosting) treatment should be carried out. And observe in time, and immediately stop the defrosting when the frost layer disappears. Wait a moment before starting the device.

14. The evaporator fan should avoid vibration during the operation. In addition to increasing the mechanical wear, the vibration will also cause the connecting pipe on the unit to loose or break [source refrigeration encyclopedia public number]. If the machine finds abnormal noise during operation, it should be stopped for inspection and then re-run.

15. The parameters such as the temperature and temperature difference of the cold storage equipment should be set according to the actual conditions of the cold storage. The parameters cannot be changed arbitrarily. The cold storage has been customized according to the user's requirements at the factory. To understand the technical parameters of the cold storage, the parameters of the refrigeration are set on the controller.

Second, the maintenance of the storage of frozen and cold storage

1. After the cold storage is installed or used again after long-term deactivation, the speed of cooling should be reasonable: it should be controlled at 8-10 °C every day, and should be kept at 0 °C for a while. When the cold storage equipment is not used for a long time, the total power supply of the cold storage should be cut off, and the cold storage equipment should be protected from moisture and other substances such as gray.

2, the top of the cold storage equipment (top plate) should not be stacked, otherwise the cold storage library will be deformed and affect the insulation performance, and keep the passage around the cold storage unimpeded, only to ensure good heat dissipation, cooling can be good. The location of the cold storage should be kept dry, clean, free of inflammable and explosive materials, and ensure that there are no safety hazards.

3, cold storage library board maintenance, pay attention to the use, should avoid the collision and scratching of the hard object on the library. Because it may cause the depression and rust of the library board, it will seriously reduce the local insulation performance of the library.

4, cold storage seal parts maintenance, because the assembly type cold storage is made up of several pieces of insulation board, so there is a certain gap between the board and the board, these gaps will be sealed with sealant during construction to prevent air and moisture from entering. Therefore, in use, some parts of the seal failure should be repaired in time.

5, cold storage ground maintenance, the general use of small-scale assembly cold storage floor insulation board, the use of cold storage should prevent the ground from a large amount of ice and water, if there is ice, do not use hard objects to knock when cleaning, damage the ground.

6. Check the thermal insulation performance of the cold storage warehouse, check whether there is condensed water around the cold storage, check whether the cold storage door is open, and the sealing effect of the cold storage door.

Third, cold storage sterilization and odor removal

First, the cold storage of mold sterilization and disinfection

Cold storage of cooking ingredients and foods contain certain fats, proteins and starches. The presence of these nutrients can cause mold and bacteria to multiply and grow. In order to do a good job in cold and hygienic management and to ensure the refrigerated quality of food and cooking ingredients, it is necessary to carry out cold and hygienic disinfection work regularly.

For the sterilization and disinfection of cold storage, acid disinfectants can be used first. The bactericidal action of acid disinfectants is mainly the protein in the coagulated cells. Common disinfectants are lactic acid, peroxy acid, bleaching, formalin and the like.

Second, the method of eliminating odor in the cold storage

1. The cause of odor in the cold storage.

The so-called odor, that is, the cooking ingredients and food in the cold storage, under the influence of external factors, produce an abnormal odor through physical and chemical changes. For a long time, this odor adheres to the walls, ceilings, equipment and tools of the cold storage. on. There are odors in the cold storage. Generally speaking, there are several reasons:

There is an odor in the cold storage before it enters the food. Before entering the cold storage, there will be spoilage and deterioration, such as spoiled eggs, meat and fish. The cold storage where the fish is stored, the meat, eggs, fruits and vegetables are stored without washing, and the smell is infected and deteriorated.

The cold storage is not well ventilated, and the temperature and humidity are too large, causing the mold to multiply and produce a mildew smell. Foods with different odors exist in a cold storage warehouse, causing food odors to infect each other.

The leakage of the cold storage refrigeration pipe, the refrigerant (ammonia) erodes into the food, causing odor. The temperature in the cold storage does not drop, causing the meat to deteriorate and produce spoilage. This happens mostly when fresh meat is not frozen, frozen, or transferred to the warehouse.

2, the method to prevent the occurrence of cold storage odor

Foods that are refrigerated in cold storage must be inspected and placed in stock without deterioration. Cold storage warehouses must not have odors before they are purchased. If there is any odor, it must be treated with technical means to eliminate the odor before use.

It is usually necessary to strengthen the maintenance of the refrigeration equipment, and it is strictly forbidden to dump the unloading goods to prevent the pipeline from being damaged and the refrigerant to be leaked. During the cold processing of food, the cold storage warehouse must be kept at a certain temperature, and the frozen food should not be transferred or stored.

If the temperature of the cold storage warehouse does not drop, you should find the reason and wait for the food processing. Do not mix and store foods that are infected with each other in the cold storage.

3, cold storage method to eliminate odor

Ozone method. Ozone has a strong oxidizing effect, which not only eliminates the odor of the cold storage warehouse, but also stops the growth of microorganisms. The use of an ozone generator can eliminate the odor of the warehouse. If the food containing more fat is stored in the cold storage, it is not suitable to use ozone treatment to avoid the oxidation of fat and the rancidity.

Formaldehyde method. The goods in the cold storage warehouse were carried out, and the 2% formaldehyde aqueous solution (ie, formalin solution) was used for disinfection and odor removal.

Vinegar method. The cold storage warehouse with fish is very heavy. It is not advisable to install other foods, and it is necessary to thoroughly clean and remove the fishy smell before loading other foods. The general method of removing the smell of fish is to use vinegar.

The specific method is as follows: after the fish is out of the cold storage, the frost layer on the evaporation tube group is cleaned, and the temperature of the warehouse is kept below -50 ° C, and then the volume of the vinegar is 50-100 g per cubic meter of the cold storage warehouse, and the sprayer is used. In the interior of the warehouse, the warehouse door is closed tightly, and the blower is started intermittently, so that the vinegar volatilizes and flows in the warehouse, so that the vinegar absorbs a large amount of fishy smell. Generally, after about 4-24 hours, the cold storage door is opened, and the vinegar taste can be blown out of the library after continuous blasting for several hours.

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