The refrigerated truck is a closed van type transport vehicle used to transport frozen or fresh goods. It is equipped withrefrigeration unitThe refrigeration device and the refrigerated special transport vehicle with polyurethane insulated compartment are commonly used to transport frozen food (refrigerated vehicle), dairy products (milk transport vehicle), vegetables and fruits (fresh goods transport vehicle), vaccines and drugs (vaccine transport vehicle), etc.
Chinese name
refrigeration van
Nature
Enclosed van
Role
Transportation of frozen or fresh goods
Scope
Frozen food, dairy products, vegetables and fruits
The refrigerator car consists of the traveling part of the chassis of the special vehicle, and the heat insulation and heat preservation chamber (generallyPolyurethane material, glass fiber reinforced plastic, color steel plate, stainless steel, etc.),refrigeration unit, in the carTemperature recorderFor vehicles with special requirements, such as meat hook, waist rail, aluminum alloy guide rail, ventilation slot and other options can be added.
principle
During the operation of the refrigeration system, the air compressor continuously sucks the low-pressure gaseous refrigerant in the evaporator. After the compressor works, it turns into high-pressure refrigerant steam and flows to the condenser. Due to the high pressure, the condensation process is carried out in the condenser, which emits a lot of heat to the surrounding environment. The refrigerant from the condenser completely turns into liquid,When the liquid refrigerant flows into the expansion valve, because the pressure drops sharply, the liquid refrigerant evaporates in the evaporator and absorbs a lot of heat from the compartment, thus reducing the temperature in the compartment.Refrigerant vapor enters againAir compressor, carry out the next working cycle, so that the heat in the compartment is transferred to the surrounding atmosphere continuously.
Manufacturing technology of refrigerated car body
1. The "sandwich" plate adhesive type assembled in pieces is adopted by the large domestic refrigerator car manufacturers, and the refrigerator car produced by this technology has high thermal insulation performance.
2. Injection foaming type assembled in pieces.
3. The whole skeleton is injected with foam.
4. Vacuum adsorption pasting
Refrigeration unit classification
The refrigeration unit is divided into non independentrefrigeration unitAnd independent refrigeration unit.Domestic units and imported units, etc.The external chiller is used for general models, and the built-in chiller is used for a few mini refrigerated cars.For refrigerated vehicles with low temperature requirements, a built-in cold plate can be used in the compartment (the function is equivalent to the evaporator).
Classified by chassis carrying capacity: mini refrigerator carSmall refrigerator carMedium refrigerator car, large refrigerator car
Classification by compartment type: bread type refrigerator car, van type refrigerator car semi trailer refrigerator car
characteristic
The containers of sealed refrigerated vehicles need to be strictly sealed to reduce the externalquantity of heatExchange to keep the refrigerator lowtemperature。
Refrigerated truck
RefrigerantRefrigeration equipmentConnect with the container and provide continuousrefrigerationEnsure that the temperature of the container is within the allowable range of the goods.
The goods transported by portable refrigerated trucks are usually those that cannot be stored for a long time. Although there are refrigeration equipment, they still need to be delivered to the destination quickly.
Containers of insulated refrigerated trucks are similarContainerHowever, it is made of materials with good heat insulation effect, reducing heat exchange.
Key equipment
Refrigeration unit of refrigerator car
Refrigeration of refrigerator carcrew: The important equipment to provide continuous "cold" for refrigerated truck containers is usually installed incontainerFront top of, withair conditionerIt has the same shape, but it has stronger cooling capacity than air conditioners of the same volume.[1]
Introduction to all parts of refrigerator car
Announce
edit
Car body
Structural form of car body:
1. The "sandwich" plate adhesive type assembled in pieces is adopted by the large domestic refrigerator car manufacturers, and the refrigerator car produced by this technology has high thermal insulation performance.
2. Injection foaming type assembled in pieces.
3. The whole skeleton is injected with foam.
4. Vacuum adsorption pasting.
Requirements for insulation material:
(1) Uniform foaming and low density
(2) The thermal conductivity shall be as small as possible, and it is generally required to be lower than 0.045 W/(m? K)
(3) The stability of temperature change is good, and the service performance shall meet the specified requirements within the temperature range of - 40~70 ℃
(4) It has a certain mechanical strength, and can withstand the vibration and impact of the vehicle under adverse road conditions without damage or deformation
(5) Low water absorption and hygroscopicity, good frost resistance
(6) It is non-toxic, tasteless, and has low permeability. When the thermal insulation material is burned, it cannot be decomposedToxic and harmful gases
Expansion valve
The expansion valve plays the role of throttling and depressurizing. When the high-pressure refrigerant liquid condensed by the condenser passes through the throttle valve, the pressure drops due to blockage, leading to the gasification of some refrigerant liquid. At the same time, it absorbs the latent heat of gasification, and its own temperature decreases accordingly, becoming a wet vapor of low temperature and pressure, and then entering the evaporator.
evaporator
It is also a heat exchanger, which enables low pressure and low temperature refrigerant liquid to absorb the heat of the cooled medium (air, water, salt water or other refrigerants) during boiling, so as to achieve the purpose of refrigeration.[2]
