Segmented Contact Heater with PTC Element and Thermostat
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Solution Overview
Problem
Existing contact heaters for vehicles and vessels face issues with overheating, which can lead to oil carbonization and potential ignition, and require custom manufacturing to fit specific engine geometries, making them more expensive.
Innovation Solution
A two-part contact heater design featuring a standardized heating member with a removable contact element and PTC heating elements, equipped with a thermostat switch to prevent overheating and facilitate mounting on various units, including those made of plastic or composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a contact heater is designed with a fixed geometry to fit specific engine surfaces, then heat transfer efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The contact heater is divided into two separate parts: a standardized heating element with uniform dimensions and a removable contact element with geometry adapted to the specific surface. This segmentation allows the heating element to be mass-produced with simple geometry while the contact element can be customized for different engine surfaces, resolving the contradiction between heat transfer efficiency and manufacturing complexity
Solution Approach 2:
The standardized heating element is designed with universal dimensions and mounting features that allow it to be used with different contact elements for various engine surfaces. This universality enables a single heating element design to serve multiple applications, reducing manufacturing complexity while maintaining effective heat transfer through the customized contact element
2Power
If a contact heater operates at high temperature for effective heating, then heating performance is improved, but risk of overheating and oil carbonization increases
Solution Approach 1:
The contact heater incorporates a thermostat that continuously monitors the temperature and automatically interrupts the electrical current when a predetermined temperature is reached. This feedback mechanism prevents overheating and oil carbonization while allowing the heater to operate at high temperatures for effective heating performance, resolving the contradiction between heating power and overheating risk
Solution Approach 2:
The thermostat is pre-configured with a safety temperature threshold that prevents the heater from reaching temperatures that could cause oil carbonization. By establishing this protective threshold in advance, the system cushions against the harmful effects of overheating while maintaining effective heating operation below the threshold
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 reduces the risk of overheating, allows for standardized manufacturing, and ensures safe operation by automatically regulating temperature, while being adaptable to different engine geometries and materials.
Implementation Method 1
an electrical heating element, where the heating element in principle is an electric resistance which generates heat when it is subjected to an electrical potential
Implementation Method 2
the liquids inside the motor (oil or cooling liquid) are heated by convection heat from the contact heater via the engine block wall
Implementation Method 3
the liquids inside the motor (oil or cooling liquid) are heated by convection heat from the contact heater
Implementation Method 4
a thermostat switch which is arranged to automatically interrupt or establish electrical connection between the heating element and the electrical energy supply on the basis of the temperature
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A contact heater (19) comprising a heating member (2) and a contact surface (21; 21'), where the contact surface (21; 21') is adapted for abutment towards a portion of an engine (16), gearbox, or similar, which is to be heated. The heating member (2) comprises at least one PTC element (4) and connection means (5, 7, 10) for electrical energy supply, and the contact surface (21) constitutes a portion of a contact element (1) which is releasably connected to the heating member (2) by connection means (11, 11'). The contact heater is suitable for use on an engine, for example an automobile engine, an engine block, a sump, a gearbox or a part of the transmission system for a vehicle.