Thermostatic Valve Actuator Elastic Coupling
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Solution Overview
Problem
Current thermostatic valve actuators for hot water heating systems face challenges in versatility, quick temperature adjustments, and cost-effectiveness, particularly in controlling valves independently of required valve force and readjusting quickly after temperature changes.
Innovation Solution
The proposed thermostatic valve actuator incorporates an elastic coupling device to influence the control characteristic, allowing for adaptable 'preload' and rapid initial switching, combined with an electric motor for subsequent precise control, reducing hysteresis effects and leveraging existing components for efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional thermostatic valve actuator design is used, then the structure is simple and cost-effective, but the actuator cannot quickly readjust after temperature changes and is dependent on valve force requirements
Solution Approach 1:
The actuator is divided into two independent systems: a traditional thermostatic control element for temperature sensing and a separate electric motor with elastic coupling for active control. This segmentation allows each component to perform its specialized function optimally - the thermostatic element provides temperature response while the electric motor provides force-independent adjustment speed.
Solution Approach 2:
An elastic coupling device is introduced as an intermediary between the electric motor and the valve mechanism. This elastic coupling absorbs force variations and allows the actuator to operate independently of valve force requirements while maintaining precise control capability.
2Speed
If an electric motor is added to enable quick adjustments, then the readjustment speed improves, but the device complexity and cost increase
Solution Approach 1:
The thermostatic control element serves itself by directly actuating the valve through the elastic coupling without requiring complex control electronics. The electric motor only activates when temperature adjustment is needed, and the elastic coupling provides passive force absorption, simplifying the overall control architecture.
Solution Approach 2:
The electric motor with elastic coupling serves multiple functions: it provides quick temperature adjustments, operates independently of valve force requirements, and can work with existing thermostatic control elements. This multi-functionality reduces the need for additional specialized components.
3Adaptability or versatility
If the actuator is made independent of valve force, then the versatility improves, but the control precision may be compromised
Solution Approach 1:
The thermostatic control element provides continuous feedback on temperature conditions, and the elastic coupling transmits this control action to the valve while absorbing force variations. This feedback mechanism ensures precise temperature control is maintained even as the actuator becomes independent of valve force requirements.
Solution Approach 2:
The elastic coupling changes the mechanical parameter transmission by absorbing force variations, allowing the actuator to maintain control precision across different valve force conditions. This parameter adaptation enables versatility without sacrificing control accuracy.
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 enables fast initial temperature shifts and stable control, making the thermostatic valve actuator largely independent of valve counterforce, with improved control characteristics and energy efficiency, maintaining constant water temperature.
Implementation Method 1
a control element that changes depending on the temperature... The most common design of thermostatic valve bonnets currently in use is to use a control element that is filled with a charge whose volume changes with temperature
Implementation Method 2
its influencing device influences the control characteristic of the control element by means of an elastic coupling device. This elastic coupling allows the thermostatic valve actuator to be provided with a certain 'preload' adapted to the respective situation
Data Source
Figure 1
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AI summary
Disclosed is a thermostatic valve actuator (11) for a hot water heating system (1), comprising a temperature-dependent control element (15, 16), an actuating element (13), and a device (23) that influences the regulation characteristics of the control element (15, 16). Said influencing device (23) influences the regulation characteristics of the control element (15, 16) by means of an elastic coupling mechanism (26). The influencing device (23) can be equipped with a spring mechanism, an electric motor, a force sensor, an electronic controller, and a digital display unit.