Sealed Wall Box Mounting for Thermostat Temperature Sensor Isolation
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Solution Overview
Problem
Home automation systems, such as thermostats, face challenges in accurately measuring temperature due to heat generated by display screens, which can affect the accuracy of temperature control and measurements, especially when installed in varying environments.
Innovation Solution
A temperature control device is mounted within a sealed electrical wall box that prevents air from the wall cavity from entering, using glands to securely accommodate electrical cables and wires of varying thicknesses, ensuring an airtight seal and minimizing the impact of airflow on temperature measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature control device is mounted in a standard electrical wall box, then installation is simple and cables can be easily connected, but air from the wall cavity can enter the box and affect temperature sensor accuracy
Solution Approach 1:
The wall box is divided into a front face with mounting flange and a back plate with cable access holes. The gland seals are separate components that fit into the holes and are punctured by cables. This segmentation allows each component to perform its specific function while maintaining overall simplicity and achieving airtight sealing without complex integrated structures.
2Illumination intensity
If the display screen operates at high intensity, then visibility and user interface performance are improved, but heat generated by the display screen affects temperature sensor measurements
Solution Approach 1:
The temperature sensor is extracted from the main device housing and placed inside the sealed electrical wall box. This physical separation isolates the sensor from heat-generating components like the display screen, allowing the display to operate at high intensity for good visibility while the sensor accurately measures ambient temperature without thermal interference.
Solution Approach 2:
The electrical wall box creates a thermally isolated environment for the temperature sensor, protecting it from thermal influences generated by the device's own components. This inert thermal environment ensures accurate temperature measurements regardless of display screen intensity or other internal heat sources.
3Adaptability or versatility
If glands are used to seal around cables of varying thicknesses, then adaptability to different cable sizes is improved, but the sealing structure becomes more complex
Solution Approach 1:
The glands are made of elastomeric material that is flexible and can be deformed during installation. The front portion is tapered to facilitate insertion, and the intermediate portion flexes to conform to cables of different diameters. This flexibility allows a single gland design to adapt to various cable sizes while maintaining a simple overall structure.
Solution Approach 2:
The gland structure transitions from a static rigid form to a dynamic flexible form during installation. The elastomeric material allows the gland to deform elastically when pressed into the hole and when a cable is inserted, adapting its shape to seal around cables of varying thicknesses. This dynamic behavior provides versatility without requiring multiple fixed-size components.
Data Source
AI summary
A temperature control system may include a temperature control device, an electrical wall box having a hole for passing a wire or cable into the wall box, and a gland configured to be inserted into the hole of the wall box. The temperature control device may include a temperature sensor. The wall box may be configured to be mounted to a wall. The temperature control device may be configured to be mounted to the wall box such that the temperature sensor is located within the wall box. A wire or cable may be passed from a wall cavity of the wall, through the gland once inserted into the hole of the wall box, into an interior of the wall box, and attached to the temperature control device. The gland and the wall box may be configured to prevent air within the wall cavity from entering the wall box when the wire or cable is passed into the wall box.