Refrigerator car knowledge - maintenance articles

Cars should be used to protect cars, do not think that only old cars need maintenance, in fact, the road to the maintenance of refrigerated trucks began to buy home.
First of all, the first step to take care of the car is to let the car go. Going together, as the name implies, means that the new car is allowed to walk for a period of time, allowing all parts of the engine to run smoothly. The purpose is to enable the various parts of the engine to adapt to the environment. Can be adjusted to improve. The pros and cons of running a refrigerated truck will have an important impact on the life, safety and economy of a refrigerated truck. It cannot be underestimated.

Second, preventive maintenance is inseparable from the maintenance and maintenance of vehicles and chillers during our normal use. Only when the equipment is properly maintained and maintained on time, the normal use of the equipment can be guaranteed and the service life of the equipment can be extended. Usually, the chassis engine is maintained and maintained according to the mileage, while the refrigeration unit is designed to maintain and maintain according to the engine operating hours. The usual refrigeration unit is 500-700 hours for maintenance and maintenance. It needs to replace the oil filter, fuel filter, and air filter; and pay attention to check the tightness of the belt, whether the cooling system leaks, etc.; However, the current individual refrigeration units (such as The United States Cool King) In order to meet the needs of environmental protection, to minimize the damage to the environment, reduce the emission of harmful substances, so the use of synthetic or semi-synthetic engine oil to replace the ordinary motor oil, thereby extending the engine maintenance time, usually done in accordance with 2000 hours maintenance. As a result, the waste of used motor oil is reduced. In addition, scientific experiments show that by using this high-end engine oil, not only the wear of the engine is reduced, but also the fuel consumption of the engine can be reduced. Therefore, scientific maintenance and maintenance can not only ensure the integrity of equipment, but also reduce operating costs.

Transport temperature control is necessary

And if the goods with too high or too low temperature are loaded into the compartment of the refrigerated truck, the refrigerating unit is set to the necessary transport temperature of the transported goods, and the temperature of the cargo is lowered or raised to its necessary temperature for a certain period of time. However, the opposite is true. Not only does the temperature fall (or does not go up), the cargo damages or deteriorates.

The cooling air blown by the refrigeration unit will change the temperature of the goods and the water content of the goods will be lost. This will cause the quality of the goods to change, which will lead to a decline in the quality of the goods, a shortened storage period, and even a corruption of the goods. It is quite possible that the fresh beans that you pull will have more "dryness" at the destination beans, which will reduce the weight and cause trouble. This is why refrigerated trucks generally go to the cold storage, and rarely go to the field to pull the goods directly.

Refrigerated car is not cold storage refrigeration unit is mainly insulation

A refrigerated truck is not a cold storage. In the concept of many people, a refrigerating unit on a refrigerated truck is free to freeze or heat the cargo loaded into the compartment to its required temperature. In fact, the refrigeration unit is used to maintain the temperature of the cargo, not to reduce the temperature of the cargo. It is similar to the quilt used to sell cold drinks in the past. It wraps the goods. When the outside temperature passes radiation, conduction, and convection into the compartment of the refrigerated truck, it will be carried away by the cooling air blown by the refrigeration unit, blocking the heat source from entering the goods.

Carriage must be pre-cooled or warmed up before loading

Before loading, the car must be pre-cooled or warmed up for about 1.5 hours. Because the vehicle is parked in the open air, usually the temperature of the passenger compartment is the temperature of the external environment. In general, the temperature of the conveyed goods cannot be the ambient temperature. If so, it is not necessary to transport the refrigerated truck. When the cargo is loaded into the carriage, the ambient temperature inside the carriage will affect the temperature of the transported cargo, which will cause the quality of the transported cargo to change. Therefore, it is necessary to precool the carriage to the required temperature before loading.

Shut down the chiller assembly cargo unloading reefer temperature loss is slower

When loading and unloading, the refrigeration unit must be turned off. Many people do not shut down the refrigeration unit when loading or unloading cargo, thinking that this can make the temperature of the goods rise more slowly. In fact, this is a very wrong understanding.

If the refrigeration unit is not turned off, when the door of the car is opened, because the fan of the evaporator of the refrigeration unit is working, the fan blows the cool air from the upper part of the cabin, and the lower part will rapidly suck in the hot air from outside, resulting in the rapid increase of the temperature inside the cabin. If the goods are shut down and then loaded and unloaded, the air flow stops due to the fan being stopped, the air pressure inside and outside the cabin is the same, and the speed of the hot air entering outside is slower.

Excessive stress on cargo discharge requires keeping cool air circulation in the compartment

When placing the goods, it must be taken into account that the cold air circulation inside the refrigerated compartment is good. The goods can be stacked on the double-sided pallets. The refrigerated cargo pallets cannot contain the reel film. The reel film will block the circulation of cold air to the goods. Keep a distance of 23cm or more between the top of the compartment and the cargo. The floor of a refrigerated truck generally has a groove that can be ventilated, but some do not. If not, a double-sided pallet is used to load, so as to ensure the cold airflow at the bottom of the floor.

The stacking of goods should not be too high, and should not be higher than the level of the outlet. If the front of the air outlet is blocked by goods or is too close to the goods, it will not only affect the storage and transportation temperature of the goods, but also affect the normal operation of the refrigeration unit, affecting the cold air circulation inside the carriage, causing the cargo near the vents to freeze, and other The local cargo temperature may be too high. In addition, the refrigeration unit is usually equipped with an air-sensitive defrost design. When the goods are too close to the air outlet, the ice near the air outlet will freeze, the unit will quickly enter the defrosting state, the temperature will rise, the defrost will end immediately, and this action will be repeated. The temperature does not fall down. When transporting fruits and vegetables, more attention should be paid to the fact that fruits and vegetables, etc., will produce heat of respiration. If the circulation of cold air is not good, the temperature in the central part of the car will rise, which will lead to problems with the quality of the goods. Also, the upper cargo that is closer to the air outlet should be covered with a cover cloth to protect it from frostbite.

Frequent cleaning of refrigerated compartments keeps the interior clean and clean

Cleaning the refrigerator compartment has two functions. One is to keep the interior of the compartment clean and prevent strange smells in the compartment. This should be well understood, refrigerator cars are somewhat similar to the refrigerator, if you do not pay attention to cleaning, it is easy to have strange smell. Refrigerated vehicles are often loaded with different goods, especially fish, meat, etc., so that each time the goods are transported, they are cleaned once. Another role is to prevent the evaporator fan of the refrigeration unit from sucking impurities into the evaporator coil, thereby reducing the cooling effect of the refrigeration unit. This is one of the reasons why the refrigeration cars will feel worse than the start of cooling after a few years. .