Characteristics of Air Conditioning Devices for Railway Vehicles The principle of refrigeration for railroad vehicle air conditioners does not differ from general air conditioning. However, because it is installed on a vehicle, it has the following characteristics: First, its installation site, installation space, and power supply are all subject to strict restrictions; secondly, the cooling capacity is much larger than that of general building air conditioners. The installation site and space railway vehicles are generally of a box type structure. In order to maximize the space inside the vehicle compartment, power devices such as traction devices, auxiliary power supply devices, brake devices, and air conditioning devices are installed under the roof and under the floor. Air-conditioning units vary in their structure depending on the installation location. Under-floor installation The air-conditioning device is installed under the floor of the vehicle, which reduces the center of gravity of the vehicle and facilitates the speeding up of the vehicle. Recently, the Shinkansen air-conditioning units are installed almost under the floor. However, there are also deficiencies in this approach, which is that in order to send the conditioned air into the vehicle and reach the top, it is necessary to install a blower and lay the appropriate piping. In addition, due to the installation of a traction device, auxiliary power supply, etc. under the floor, it is necessary to ensure the installation space of the air conditioner. Rooftop installations are represented by commuter vehicles, and many vehicles use air conditioners mounted on the roof. Its advantage is that the air-conditioning duct is simplified, and the installation of the air-conditioning device is also relatively easy, which is beneficial to the compactness and light weight of the vehicle. The disadvantages are: First, the top of the vehicle is limited by the vehicle's limit, and its installation space is limited; secondly, the center of gravity of the vehicle is increased, which is not conducive to high speed. Therefore, in recent years, this type of installation has been mostly used for vehicles such as commuters, suburban electric trains, and subways, which are not very fast. Installation on the floor When there is no space under the roof and under the floor, use the space of the guest to install the air conditioner. This air conditioner is similar to the air conditioner in the shop. The floor is installed in the double-decker bus and the passenger compartment is the vehicle of the observation car. When no space for air conditioning is installed under the local board, the air-conditioning is installed in the space between the guest floor and the body frame. The split-type split type air conditioner is composed of an indoor unit and an outdoor unit. The outdoor unit is installed under the floor. The indoor unit is installed indoors or on the roof, and is mainly used for new traffic and tilting trains. Power supply railroad vehicle air conditioner Pugou Kangxiong (Japan) Railway vehicles take power from the contact network, and their power supply is DC power supply or single-phase AC power supply. Shinkansen air-conditioning Shinkansen began in 1964 and installed air-conditioning on all vehicles. Air conditioners were installed on the roof at that time. Recently, with the speeding up of trains, air conditioners are almost all installed under the vehicle floor. Subway air conditioning reduces the size of subway tunnels, which can reduce construction costs. Most of the subways use the 3rd rail power supply method. This method does not need to set the pantograph on the roof, which can reduce the size of the subway tunnel and the size of the roof can also approach the size of the tunnel. In this way, it is extremely difficult to install air conditioning on the roof. Vacuum Forming Machine,Foam Dish Machine,Foam Food Plate Machine,Foam Food Tray Machine haiyuanmachinery , https://www.foamfoodboxmachine.com