Built-in type air conditioning device
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Solution Overview
Problem
Built-in type air conditioning devices with V-shaped indoor heat exchangers face issues such as drain water scattering, uneven air flowing velocities, and temperature differences, leading to inefficient heat exchange, complex fixing structures, and difficult maintenance due to the limited space and configuration of the indoor unit mounted in a ceiling.
Innovation Solution
The indoor heat exchanger is designed with the upper portion closer to the air blower, a step between the upper and lower heat exchange portions to manage drain water, and resin fixing members to simplify the structure and maintenance, while the air blower's blow-out port confronts the apex of the V-shape, ensuring uniform air flow and increased heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the indoor heat exchangers are arranged in V-shape to increase capacity, then the heat exchange capacity increases, but drain water scatters from the connection portion and is blown out from the blow-out port
Solution Approach 1:
A drain water guide member is introduced as an intermediary component between the upper and lower heat exchangers. This guide member receives drain water from the upper heat exchanger and directs it to the drain pan, preventing scattering while maintaining the V-shaped configuration that increases heat exchange capacity
Solution Approach 2:
The drain water guidance function is extracted from the heat exchanger structure itself and implemented as a separate, dedicated drain water guide member. This allows the heat exchangers to maintain their V-shaped capacity-optimizing configuration while the separate guide member handles drain water control
2Quantity of substance
If the indoor heat exchangers are arranged in V-shape, then the heat exchange capacity increases, but the positions and distances of parts within the heat exchange face are uneven, causing difference in air flowing velocity and uneven temperature distribution
Solution Approach 1:
The air blower is positioned to face the apex of the V-shaped heat exchanger arrangement, creating localized optimal air flow conditions at the apex. This positioning ensures that air is distributed more uniformly across the heat exchange face, compensating for the geometric asymmetry of the V-shape and maintaining uniform heat exchange efficiency throughout
3Stability of the object's composition
If a fixing structure is used to secure the V-shaped heat exchanger, then the heat exchanger is fixed in place, but the fixing structure becomes complicated and protrudes into the air flowing path, serving as a resistor to air flow
Solution Approach 1:
The fixing members are merged with the end portions of the heat exchanger, forming an integrated structure. The fixing members extend from the heat exchanger ends and are fixed to the unit case, eliminating the need for separate, complex fixing mechanisms while maintaining stability and avoiding air flow obstruction
4Ease of repair
If the refrigerant pipe and drain pipe are made to penetrate through the side plate for maintenance access, then the device can be serviced, but the workability is bad due to narrow space under the roof
Solution Approach 1:
The side plate is designed with multi-functionality, serving both as a structural component and as a maintenance access panel. The side plate can be opened or removed to provide access to the refrigerant pipe and drain pipe connections, eliminating the need for separate access openings and improving workability in the narrow under-roof space
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 configuration prevents drain water scattering, ensures uniform heat exchange efficiency, simplifies the fixing and maintenance of the indoor heat exchanger, and enhances the overall performance of the air conditioning device by reducing the number of parts and improving workability.
Implementation Method 1
an indoor heat exchanger and an air blower are mounted in the indoor unit. The compressor, the outdoor heat exchanger and the indoor heat exchanger are connected to one another through the refrigerant pipe to constitute a refrigerant circuit. Air is blown to the indoor heat exchanger by the air blower, and air-conditioning air heat-exchanged with refrigerant flowing in the indoor heat exchanger is blown through an air blow-out duct to a room to be air-conditioned
Implementation Method 2
Air is blown to the indoor heat exchanger by the air blower, and air-conditioning air heat-exchanged with refrigerant flowing in the indoor heat exchanger is blown through an air blow-out duct to a room to be air-conditioned
Implementation Method 3
a compressor and an outdoor heat exchanger are mounted in the outdoor unit
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A built-in type air conditioning device in which maintenance performance and efficiency of an indoor heat exchanger are enhanced is provided. A heat exchanger 60 contains an upper heat exchange portion and a lower heat exchange portion which are connected to each other substantially in V-shape in side view, and the lower end of the upper heat exchange portion is mounted to be stacked on the lower heat exchange portion at the apex of the V-shape. The heat exchange area of the lower heat exchange portion is set to be larger than the heat exchange area of the upper heat exchange portion. Inverted U-shaped grooves 66A, 66B are provided to be opened downwards so that an auxiliary refrigerant pipe 67 of the heat exchanger 60 can be inserted into the heat exchange chamber integrally with the heat exchanger 60. Both the end portions of the heat exchanger 60 are provided with fixing members 63A, 63B formed of resin which are fixed to the front plate 16 and the top plate 12 of the unit main body 10 to fix the heat exchanger 60 to the inside of the unit main body 10.