HVAC Case Single Airflow Door Defrost Demist Control

Solution Overview

Problem

Existing HVAC cases require multiple airflow control doors and complex linkages to manage airflow through defrost and demist outlets, which increases costs and complexity.

Innovation Solution

A single movable airflow control door with an elastomeric seal, capable of rotating up to 100°, is used to control airflow through both the defrost and demist outlets, simplifying the arrangement and reducing the need for multiple doors and linkages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple airflow control doors and linkages are used to control airflow through defrost and demist outlets, then airflow control capability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveairflow control capabilityVSAvoiddoor linkage complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple airflow control doors into a single integrated door assembly that controls airflow to both defrost and demist outlets simultaneously. This merging of previously separate components reduces the overall number of parts and linkages while maintaining the ability to control airflow distribution to different outlets.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single airflow control door is designed to perform multiple functions by controlling airflow to both defrost and demist outlets through its rotational movement. This multi-functional door replaces what would traditionally require multiple specialized doors, simplifying the system while preserving adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple airflow control doors are used to control airflow through defrost and demist outlets, then airflow control capability is improved, but manufacturing cost increases

Engineering Contradiction:

Improveairflow control capabilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent combines multiple airflow control doors into a single integrated door assembly that controls airflow to both defrost and demist outlets simultaneously. This merging of previously separate components reduces the overall number of parts and linkages while maintaining the ability to control airflow distribution to different outlets.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single airflow control door is designed to perform multiple functions by controlling airflow to both defrost and demist outlets through its rotational movement. This multi-functional door replaces what would traditionally require multiple specialized doors, simplifying the system while preserving adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If multiple airflow control doors and linkages are used, then airflow control capability is improved, but assembly efficiency decreases

Engineering Contradiction:

Improveairflow control capabilityVSAvoidassembly efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent combines multiple airflow control doors into a single integrated door assembly that controls airflow to both defrost and demist outlets simultaneously. This merging of previously separate components reduces the overall number of parts and linkages while maintaining the ability to control airflow distribution to different outlets.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single airflow control door is designed to perform multiple functions by controlling airflow to both defrost and demist outlets through its rotational movement. This multi-functional door replaces what would traditionally require multiple specialized doors, simplifying the system while preserving adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11135895B2HVAC case

Publication Date: 2021.10.05 DENSO INTERNATIONAL AMERICA INC

AI summary

A heating, ventilation, and air conditioning (HVAC) case, which defines a defrost outlet and a demist outlet. A single airflow control door is movable to control airflow through each one of the defrost outlet and the demist outlet.