Introduction: The Science Behind Bimetal Coil Springs
Temperature measurement is a crucial factor in various industries, from HVAC systems and industrial machinery to household appliances. One of the most reliable temperature-sensing mechanisms is the bimetal thermometer, which relies on custom flat volute bimetal spiral coil springs for accurate readings.
In this blog, we’ll explore how bimetallic spiral coils work, their key benefits, and their applications in temperature-sensitive devices.
What Are Bimetal Spiral Coil Springs?
A bimetal spiral coil spring is a temperature-sensitive component made of two different metals laminated together. These metals expand and contract at different rates when exposed to temperature changes, causing the coil to curl or uncurl. This movement is used to drive mechanical dials or send electrical signals for temperature measurement and control.
Key Features of Custom Bimetal Springs
✔ Bimetallic Composition – Two metals with different thermal expansion rates bonded together.
✔ Flat Volute Spiral Design – Maximizes sensitivity and response time.
✔ Self-Actuating Mechanism – No need for external power sources.
✔ Highly Durable – Withstands long-term thermal cycling.
✔ Customizable Sensitivity – Designed for different temperature ranges.
How Do Bimetal Coil Springs Work in Thermometers?
1️⃣ Heat Exposure
When the temperature increases, the metal with the higher expansion rate expands more than the other, causing the coil to unwind.
2️⃣ Temperature Measurement
This motion is mechanically linked to a pointer or dial, translating expansion into a readable temperature value.
3️⃣ Cooling Effect
When the temperature drops, the coil contracts, moving the dial back accordingly.
This precise and repeatable motion makes bimetal coils an essential component in analog temperature measurement systems.
Common Applications of Bimetal Spiral Coil Springs
🌡 Bimetal Thermometers – Industrial, medical, and household temperature measurement.
🔥 Thermal Switches & Sensors – Used in HVAC systems, refrigerators, and heating devices.
🔋 Thermal Circuit Breakers – Prevents overheating in electrical systems.
🚗 Automotive Temperature Controls – Found in engine cooling systems and air conditioning units.
🏭 Industrial Heat Regulators – Used in boilers, furnaces, and manufacturing processes.
Why Choose Custom Bimetal Coil Springs?
🔹 Precision Temperature Control – Engineered for specific temperature ranges and sensitivity.
🔹 Energy-Efficient & Self-Operated – No external power required for operation.
🔹 Reliable & Durable – Performs consistently over years of use.
🔹 Customizable for Any Application – Tailored coil thickness, metal combinations, and winding geometry.
💡 Pro Tip: Choosing the right bimetal combination (e.g., steel-copper, brass-steel, or nickel-based alloys) ensures optimal performance for your specific temperature range.
Conclusion: The Future of Temperature-Sensitive Bimetal Coils
Custom flat volute bimetal spiral coil springs play an essential role in temperature-sensitive applications, from industrial thermometers to automotive heat controls. Their ability to convert temperature changes into mechanical motion makes them an indispensable component in precision temperature regulation.
🔹 Need a custom bimetal coil for your application?
Contact us today for expert engineering, precise customization, and high-performance bimetal springs!
🔧 Accuracy. Durability. Innovation. 🌡