Air Path Switching in Heating Fans Without PCB Control
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Solution Overview
Problem
Existing heating and ventilating fans require a circuit board and stepping motor to switch between ventilation and heating modes, increasing costs.
Innovation Solution
A heating and ventilating fan design utilizing a timing motor and spring to control the air path switching plate, eliminating the need for a circuit board by using a timing motor to rotate the plate by a constant angle and a spring to return it to its rest position, with a relay for safe and cost-effective switching between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a circuit board and stepping motor are used to control the air path switching plate, then the switching between ventilation and heating modes is achieved, but the cost of the heating and ventilating fan is increased
Solution Approach 1:
The patent replaces the electrical control system (circuit board and stepping motor) with a mechanical timing motor and spring mechanism. The timing motor rotates the air path switching plate by a constant angle to switch between modes, while the spring returns the plate to its rest position when the timing motor is deenergized. This mechanical substitution eliminates the need for expensive circuit boards and stepping motors, directly resolving the contradiction between functional versatility and device complexity/cost.
2Adaptability or versatility
If a circuit board and stepping motor are used to control the air path switching plate, then the switching between ventilation and heating modes is achieved, but the device complexity is increased
Solution Approach 1:
The patent replaces the electrical control system (circuit board and stepping motor) with a mechanical timing motor and spring mechanism. The timing motor rotates the air path switching plate by a constant angle to switch between modes, while the spring returns the plate to its rest position when the timing motor is deenergized. This mechanical substitution eliminates the need for expensive circuit boards and stepping motors, directly resolving the contradiction between functional versatility and device complexity/cost.
Solution Approach 2:
The spring mechanism automatically returns the air path switching plate to its rest position when the timing motor is deenergized, without requiring additional control circuits or motors. This self-service feature simplifies the control system and reduces device complexity while maintaining the ability to switch between ventilation and heating modes.
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 reduces costs by eliminating the need for a circuit board and simplifies wire connections while ensuring safe operation and efficient switching between ventilation and heating modes.
Implementation Method 1
a spring having a first end fixed to the frame wall, and a second end rotating synchronously with the air path switching plate, wherein the spring controls the air path switching plate to rotate in an opposite direction to the single direction, and when the timing motor is deenergized, the spring returns the air path switching plate to its rest position
Data Source
AI summary
A heating and ventilating fan including a frame, a motor with fan blades, a casing, a heating device, and an air path switching plate disposed at an air outlet of the casing for switching outlets of the ventilating fan and a timing motor. The timing motor and the air path switching plate are fixed on either side of a frame wall. The air path switching plate is connected to the timing motor shaft through a connection part, and controls the air path switching plate to rotate by a constant angle in a single direction. A spring having a first end fixed to the frame wall, and a second end rotating synchronously with the air path switching plate controls the air path switching plate to rotate in an opposite direction to the single direction. When the timing motor is switched off, the spring returns the air path switching plate to its rest position.