Thermostat Switch Assembly With Co-Injected Base for Precise Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current thermostat manufacturing processes face challenges in achieving agile and automated assembly while ensuring structural solidity and reducing the likelihood of operational failures.
Innovation Solution
A thermostat design featuring a co-injected base with terminals and a contact blade, forming an arc-like structure to cradle a cylindrical core body, which includes a movable pin and diaphragm, facilitating precise positioning and automated assembly, and optionally incorporating a heater bias with parallel resistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the thermostat body is formed by coupling multiple separate parts, then the assembly process becomes complex and time-consuming, but using a single integrated body improves manufacturing simplicity
Solution Approach 1:
The base and core body are merged into a single co-injected piece, eliminating the need for separate assembly of these components. This reduces the number of parts and assembly steps while maintaining structural integrity and precision positioning of internal components like the pin and diaphragm.
Solution Approach 2:
The thermostat is divided into functional modules: the co-injected base/core body unit, the separate shell enclosure, and internal components (diaphragm, pin, contacts). This modular segmentation allows automated assembly of the integrated base unit while keeping the shell as a separate assembly step.
2Productivity
If the base and core body are co-injected as one piece, then automated assembly becomes more efficient, but the manufacturing precision requirements increase
Solution Approach 1:
The base and core body are co-injected in advance as a pre-assembled unit with precise internal features already formed. This preliminary action ensures accurate positioning of the pin, diaphragm, and contact elements before the final assembly with the shell, enabling both high productivity and precision.
Solution Approach 2:
The co-injection process utilizes controlled material flow parameters, injection pressure, and temperature settings to achieve precise positioning of internal features within the integrated base and core body, meeting the required manufacturing precision while maintaining efficient production.
3Adaptability or versatility
If heater bias resistors are added to adjust temperature response, then the thermostat functionality is improved, but the device complexity and assembly steps increase
Solution Approach 1:
The heater bias resistors serve multiple functions: they adjust the temperature response range, compensate for thermal losses, and enable the thermostat to adapt to different operating conditions. This multi-functionality justifies the additional components by providing versatile temperature control capabilities.
Solution Approach 2:
The heater bias resistors act as intermediary elements between the power source and the bimetallic sensing mechanism, allowing precise control of the thermal input to the diaphragm. This intermediary function enables fine-tuning of the temperature response without directly modifying the sensing mechanism.
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 enables efficient, precise, and robust assembly of thermostats, reducing the risk of mechanical displacement and operational failures, while meeting industry demands for quality and time efficiency.
Implementation Method 1
a thermal insulator (40) positioned between said heater bias and said actuating mechanism, for protecting said bimetallic thermostat from overheating
Implementation Method 2
Through this technique, said resistors are externally fed, thereby supplying a pre-determined amount of heat to the bimetallic thermostat, thus reducing its activation temperature
Implementation Method 3
a bimetallic thermostat, comprising: a diaphragm (6) placed on a core body (2)
Data Source
AI summary
Provided is a thermostat including a diaphragm arranged on a core body that is inserted into a base. The assembly is closed at the top by a metallic cover and at the bottom by a flat lid. The thermostat also includes the core body presenting a cylindrical shape and is provided with two radially opposing projections and a guide hole, with the guide hole centrally arranged to receive a pin in a slidably manner; and the base, in an monolithic body, including: two walls in the form of a cylindrical arc, having collars on their top portions and together defining a cradle for said core body; and sides and faces that are adjacent to the sides. Projecting from said faces are terminals for electrical connection. The short terminal is coupled to a contact blade for contact with the long terminal. The blade is actuated by the pin, which is in turn actuated by the diaphragm. The terminals and the blade are co-injected with the base. Alternatively, the thermostat also includes a heater bias, formed by a pair of resistors in parallel.