Rail Train Unitary Air Conditioning Unit Embedded Mounting
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Solution Overview
Problem
Conventional air conditioning units in railway trains increase running resistance and suffer from poor sealing, leading to discomfort due to pressure fluctuations when passing through tunnels, and are inconvenient to install.
Innovation Solution
A unitary air conditioning unit with an integrated structure, including a mounting base, mixed air tank, and a grille-type pressure wave protection device with strip-shaped sealing members and a driver, which is embedded and sunk into the train, reducing resistance and improving sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate air conditioning units are installed for each train car, then each car can be independently controlled, but the overall system complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple air conditioning units into a single integrated modular unit that can serve multiple train carriages. The modular design allows multiple units to be coupled together longitudinally, sharing common components such as the controller, refrigerant circulation system, and housing structure, thereby reducing overall system complexity while maintaining independent control capability for each carriage.
Solution Approach 2:
The air conditioning unit is designed with universal functionality to serve multiple train carriages simultaneously. The modular configuration enables a single unit to provide cooling, heating, and air circulation services to multiple carriages, reducing the need for separate dedicated units for each carriage and thereby lowering system complexity and cost.
2Productivity
If traditional air conditioning units are used with large diameter ducts, then air circulation capacity is sufficient, but the unit height and installation space requirements increase
Solution Approach 1:
The patent transitions from traditional large-diameter duct designs to a planar duct structure that distributes air circulation in a two-dimensional plane rather than relying on vertical height. This dimensional change allows sufficient air circulation capacity to be achieved while significantly reducing the unit height and installation space requirements.
Solution Approach 2:
The duct system is segmented into multiple smaller ducts arranged in a planar configuration, allowing air to be distributed efficiently across multiple carriages without requiring large diameter ducts or excessive vertical space. The segmented duct structure maintains adequate air circulation capacity while reducing overall unit height.
3Quantity of substance
If refrigerant is stored in large external tanks, then sufficient refrigerant capacity is available, but the unit size and weight increase
Solution Approach 1:
The refrigerant storage tanks are nested within the existing hollow structural members of the train car, such as the floor beams or wall cavities. This nesting approach allows sufficient refrigerant capacity to be achieved without increasing the external dimensions or weight of the air conditioning unit, as the storage space utilizes already-present structural voids.
Solution Approach 2:
The patent employs flexible or thin-walled refrigerant storage tanks that can be conformally integrated into the available space within the train car structure. These flexible shells maximize refrigerant storage capacity while minimizing the volume and weight added to the air conditioning unit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces running resistance, enhances sealing and comfort by preventing pressure fluctuations and facilitating installation, while ensuring strength and rigidity requirements.
Implementation Method 1
a vacuum insulating layer is formed inside the expansion tank
Implementation Method 2
an evaporator heat exchanger is disposed inside the train car
Implementation Method 3
the expansion tank is connected to a refrigerant circulation system including an evaporator heat exchanger
Implementation Method 4
a condenser heat exchanger provided outside the train car
Implementation Method 5
a vacuum insulating layer is formed inside the expansion tank
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Unitary air conditioning unit complete equipment of a rail train and the rail train. The unitary air conditioning unit complete equipment is of an integrated structure, and comprises a main body (12), a mounting base (1), an air grille (3), and a mixed air box (11); a unitary air conditioning unit is mounted at an air conditioning unit mounting port at the top of the rail train by means of the mounting base (1) in a recessed manner; the mounting base (1) and a train body are provided with a sealing component therebetween and are connected by means of a connecting piece; the top surface of the unitary air conditioning unit is lower than or flush with the top of the train body; a grille type pressure wave protection device is provided at both sides of the unitary air conditioning unit.