Unitary Railway Air Conditioning Unit for Leakage Reduction
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Solution Overview
Problem
Conventional railway train air conditioning systems have complex and unreliable separated-type units with complicated pipeline arrangements, leading to long installation times, poor manufacturability, and leakage issues, which compromise safety and comfort.
Innovation Solution
A unitary air conditioning unit with integrally mounted components, including a fixed frame, compressor, evaporator, and condenser, along with a high-pressure fan and air vents, providing active pressure protection and reducing leakage points, while eliminating the need for external refrigerant pipeline mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separated-type air conditioning unit with evaporator and condenser connected by welded pipelines is used, then the air conditioning function is achieved, but the pipeline arrangement becomes complicated, installation time increases, and leakage risk increases
Solution Approach 1:
The evaporator and condenser are integrated into a single unitary air conditioning unit with internal refrigerant circulation, eliminating the need for external welded pipelines. This merging of components directly reduces pipeline complexity and leakage risk while maintaining air conditioning functionality.
2Reliability
If welded pipelines are used to connect evaporator and condenser units, then the air conditioning system is complete, but the welded pipeline is apt to leak and requires long maintenance time
Solution Approach 1:
By integrating the evaporator and condenser into a single manufactured unit with internal refrigerant channels, the system eliminates welded pipeline connections that are prone to leakage. The unitary design allows for factory-sealed refrigerant circuits, improving both reliability and ease of manufacture.
3Adaptability or versatility
If fresh air is delivered through a blower and fresh air duct from passenger compartment, then the driver's compartment receives fresh air, but it occupies the space of the air duct of the passenger compartment
Solution Approach 1:
The air conditioning system is segmented into independent units for different compartments. The driver's compartment air conditioning unit has its own integrated fresh air handling capabilities, allowing fresh air to be delivered directly to the driver's compartment without occupying passenger compartment air duct space.
4Ease of operation
If a separated-type air conditioning unit is installed with evaporator at roof and condenser under car, then the air conditioning components are distributed, but the installation process takes long time and labor efficiency is low
Solution Approach 1:
The evaporator, condenser, and other air conditioning components are merged into a single unitary air conditioning unit that can be installed as one integrated component. This eliminates the need for separate installation of distributed components and their connecting pipelines, significantly reducing installation time and improving labor efficiency.
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
This solution reduces installation time, improves labor efficiency, enhances system reliability, and provides active pressure protection, ensuring a safe and comfortable environment within the railway train.
Implementation Method 1
a compressor (2), an evaporator (3-1) and a condenser (3-2) which are mounted in the fixed frame (1) and communicated with a refrigerant pipeline
Implementation Method 2
an evaporator (3-1) and a condenser (3-2) which are mounted in the fixed frame (1) and communicated with a refrigerant pipeline
Implementation Method 3
an evaporator (3-1) and a condenser (3-2) which are mounted in the fixed frame (1) and communicated with a refrigerant pipeline
Implementation Method 4
A high-pressure fan (6-1), an evaporating fan (6-2) and a condenser fan (6-3) are further provided in the fixed frame (1). The high-pressure fan (6-1) has an air inlet close to the air vent B (5-2) and an air outlet opening into an evaporation chamber
Data Source
Figure 1
Figure 2
AI summary
Provided are a railway train and a unitary air-conditioning unit thereof. The unitary air-conditioning unit comprises a fixed frame (1), and a compressor (2), an evaporator (3-1), a heater (9) and a condenser (3-2) mounted in the fixed frame (1) and in communication by means of refrigerant pipelines, wherein a cover plate (4) is mounted above the fixed frame (1), the cover plate (4) is provided with an air vent B (5-2), and a high-pressure fan (6-1), an evaporator fan (6-2) and a condenser fan (6-3) are also provided in the fixed frame (1). The components are integrally mounted instead of being separately mounted, thereby saving the process operation time and improving the work efficiency thereof. Furthermore, the process of mounting the refrigerant pipelines outside the air-conditioning unit is omitted, thereby shortening the overall assembly cycle and also reducing the points where leakages can easily occur so as to ensure the reliability of the system. In addition, air vents (5-1, 5-2) are provided to save the space required for an air duct in a passenger compartment, and when there is a large fluctuation in the ambient pressure, the high-pressure fan (6-1) is started to offset the large pressure change outside the train body, thereby realizing active pressure protection.