Vehicle HVAC Aspirator Layout for Stable Cabin Temperature Sensing
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Solution Overview
Problem
In vehicular air conditioning devices, the aspirator's performance is reduced due to a low pressure difference between the air intake port and the aspirator's interior, leading to inadequate air intake, which affects the room temperature sensor's ability to detect temperature accurately and control cabin temperature effectively.
Innovation Solution
The air conditioning device incorporates a case with a first and second flow path portion, where the aspirator's inlet is connected to the second flow path portion, allowing air to be introduced by static pressure, reducing pressure loss and enhancing air flow speed, and is positioned centrally to avoid obstructing other components, ensuring efficient air introduction and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the aspirator is attached at the center of the main body case, then other components can be disposed at end portions, but the pressure difference between air intake port and aspirator interior becomes small, reducing air intake performance
Solution Approach 1:
The air intake port is positioned on the lateral surface of the case rather than on the front or rear surfaces, utilizing a different spatial dimension for air intake. This lateral positioning allows the aspirator to be located centrally while maintaining adequate pressure difference for effective air intake, resolving the conflict between component layout flexibility and air intake performance
Solution Approach 2:
The air intake port is specifically positioned at a location on the lateral surface where the pressure difference between the port and aspirator interior is sufficient for effective air intake. This localized optimization of the air intake port position ensures adequate air intake performance while allowing central placement of the aspirator and flexible positioning of other components at the end portions
2Ease of operation
If the air intake port is open in the downstream region, then air can be introduced, but the reduced pressure in this region causes small pressure difference, preventing suitable air intake
Solution Approach 1:
Instead of opening the air intake port on the front or rear surface of the case, the port is positioned on the lateral surface. This dimensional change in port location allows air intake to occur from a region with more favorable pressure characteristics, maintaining adequate pressure difference for effective air introduction while avoiding the low-pressure downstream region
Solution Approach 2:
Air is introduced into the case through the laterally positioned air intake port before reaching the downstream low-pressure region. This preliminary air introduction from a higher pressure zone ensures sufficient pressure difference drives air flow into the aspirator, preventing the air intake problems that would occur if the port were positioned in the downstream region
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 improves the aspirator's performance by increasing air flow speed and ensuring suitable air intake, allowing for effective temperature detection and control in the vehicle cabin, while allowing for flexible device layout.
Implementation Method 1
introduces air inside the case from the inlet by static pressure
Implementation Method 2
reducing pressure loss
Data Source
AI summary
The purpose of the present invention is to improve the performance of an aspirator. A vehicular air conditioning device (1) includes: a case body; an evaporator (20); a heater core (40); and an aspirator (50) for guiding air in a vehicle cabin to a temperature detection unit. The case body integrally includes a case upstream portion (12) in which the evaporator (20) and the heater core (40) are stored, and a case downstream portion (13) in which the air circulated through the case upstream portion (12) is circulated. The case upstream portion (12) includes a first flow path portion (16a) that circulates the air in a Z-axis direction, and a second flow path portion (16b) that connects to a downstream side of the first flow path portion (16a), and circulates the air in a Y-axis direction. The aspirator (50) includes a primary air introduction portion (53), and is mounted at a central portion of the case body. The primary air introduction portion (53) includes an inlet (53d) formed at an upstream end, and introduces the air in the case body from the inlet (53d). The upstream end of the primary air introduction unit (53) is connected to the second flow path portion (16b) from the Z-axis direction.