HVAC Junction Box Design for Single-Cable Actuator Connection
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Solution Overview
Problem
HVAC systems require significant installation time and excess cable usage due to the need for daisy-chaining components like controllers and actuators, which is undesirable.
Innovation Solution
A control system with a junction box that connects an actuator to a controller using a single cable, allowing both daisy-chain wiring and T-junction connections, utilizing a single cable with six electrically isolated conductors for data and power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If daisy-chain wiring is used to connect controllers and actuators, then system reliability is improved, but installation time increases and cable usage increases
Solution Approach 1:
The patent combines multiple functions (power supply, data communication, and control signals) into a single cable connection between the junction box and actuator. This merging of functions reduces the number of cables required and simplifies installation while maintaining reliable system operation through the preserved daisy-chain architecture.
Solution Approach 2:
The single cable connecting the junction box to the actuator serves multiple purposes: providing power, transmitting data, and carrying control signals. This multi-functional cable reduces installation complexity and time while maintaining the reliability of the control system through integrated communication and power delivery.
2Reliability
If daisy-chain wiring is used to connect controllers and actuators, then system reliability is improved, but cable quantity increases
Solution Approach 1:
The patent merges power supply, data communication, and control signal transmission into a single cable connection. This consolidation reduces the total amount of cable material required for installation while maintaining the reliable daisy-chain system architecture through the junction box's multi-functional interface.
Solution Approach 2:
The single cable performs multiple functions including power delivery, data transmission, and control signaling to the actuator. This universal cable reduces material consumption and waste while preserving system reliability through integrated multi-functional communication and power pathways.
3Reliability
If traditional multi-cable connections are used for actuators, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple separate cable connections (power, data, control) into a single integrated cable connection between the junction box and actuator. This merging reduces wiring complexity and the number of connection points while maintaining connection reliability through the junction box's ability to handle multiple signal types through a unified interface.
Solution Approach 2:
The single cable connection serves multiple functions including power supply, data communication, and control signal transmission. This universal connection method reduces device complexity by eliminating the need for separate cables and connection terminals while maintaining reliable connections through the junction box's multi-functional design.
Data Source
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AI summary
The present disclosure provides a control system for a HVAC system configured to control a flow of a medium throughout the HVAC system, the control system comprising: a controller; a first valve; a first actuator configured to receive instructions from the controller and regulate the flow of the medium through the first valve based on the received instructions; and a first junction box connected to the first actuator using a single cable, the first junction box connecting the first actuator to the controller; wherein the first junction box enables both daisy chain wiring and T-junction connection between the controller, the first actuator and a further element of the system.