Electrical relay switch for a blower of a climate control system
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Solution Overview
Problem
Conventional climate control systems face complexity and increased costs due to complex wiring and control schemes required for operating blowers at multiple speeds, especially when integrated with supplemental heating units, limiting efficiency and performance.
Innovation Solution
The implementation of an electrical relay switch, specifically a single pole double throw relay, coupled to a constant torque motor, allows for simple adjustment of blower speeds through selective energization of motor taps, enabling multi-speed operation without additional controllers, and ensuring compatibility with both cooling and heating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex wiring and control schemes are used to operate blowers at multiple speeds, then blower speed control capability is improved, but device complexity and cost increase
Solution Approach 1:
The electrical relay switch is designed to perform multiple functions: it controls both the first and second taps of the constant torque motor, enabling multi-speed operation while also providing protection functions. This multi-functionality reduces the need for separate control devices, thereby simplifying the overall control scheme while maintaining adaptability for different blower speeds
Solution Approach 2:
The electrical relay switch acts as an intermediary device between the thermostat and the constant torque motor. It receives control signals from the thermostat and accordingly connects or disconnects the motor taps, simplifying the wiring arrangement by providing a centralized control point rather than requiring direct complex wiring from the thermostat to multiple motor terminals
2Adaptability or versatility
If additional controllers are added to achieve multi-speed operation, then blower speed adjustment capability is improved, but device complexity and cost increase
Solution Approach 1:
The electrical relay switch is designed to perform multiple functions: it controls both the first and second taps of the constant torque motor, enabling multi-speed operation while also providing protection functions. This multi-functionality reduces the need for separate control devices, thereby simplifying the overall control scheme while maintaining adaptability for different blower speeds
Solution Approach 2:
The constant torque motor is designed with built-in tap points that can be directly controlled by the relay switch, eliminating the need for external speed control devices. The motor's internal structure provides the speed control capability through its winding connections, and the relay switch simply activates or deactivates these pre-configured taps, allowing the system to self-regulate speeds without additional controllers
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 provides efficient multi-speed operation of the blower, enhancing system performance and efficiency by allowing seamless speed adjustments based on cooling or heating stages, while maintaining simplicity and reducing costs.
Implementation Method 1
an electrical relay switch that is electrically coupled to the second tap, the electrical relay switch being configured to be electrically coupled to a second terminal of the thermostat such that energization of the second terminal is configured to actuate the electrical relay switch from (i) a first position to electrically de-energize the second tap
Implementation Method 2
a constant torque motor that is configured to drive the blower, the constant torque motor including a first tap and a second tap, the first tap being configured to be electrically coupled to a first terminal of a thermostat
Implementation Method 3
a heat exchanger that is configured to transfer heat between the refrigerant and the airflow
Data Source
AI summary
An embodiment of an indoor unit of a climate control system includes a blower to generate an airflow, a heat exchanger to transfer heat between a refrigerant and the airflow, and a motor to drive the blower. The motor includes first and second taps, the first tap to be electrically coupled to a first thermostat terminal. The motor configured such that: energizing the first tap and not the second tap operates the motor at a first blower speed; and energizing the first and second tap operates the motor at a second blower speed. The indoor unit also includes an electrical relay switch coupled to the second tap and configured to electrically couple to a second thermostat terminal such that energization of the second thermostat terminal is to actuate the switch from a first position to electrically de-energize the second tap to a second position to electrically energize the second tap.