PTC Heater with Open Metal Envelope for Thermal Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional PTC heating devices face inefficiencies in thermal coupling between the PTC heating element and the envelope, leading to suboptimal heat dissipation and complex assembly processes.
Innovation Solution
A tubular metal envelope with open ends and thermally conductive adapter layers allows for easy insertion and full-surface contact of the PTC heating element, eliminating the need for separate assembly steps and enhancing thermal efficiency through a flat, material-bonded closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the envelope is designed to be closed and the PTC heating element is inserted into it, then thermal coupling between the heating element and envelope is improved, but assembly complexity increases due to the need for separate assembly steps to ensure full-surface contact
Solution Approach 1:
The envelope is pre-formed with an open profile that allows the PTC heating element to be inserted from the outside. The opening is created in advance during envelope manufacturing, enabling the heating element to be positioned and contacted with the envelope surface before final closure, thus simplifying the assembly process while ensuring thermal coupling.
Solution Approach 2:
The envelope is designed as a segmented structure with an open profile consisting of multiple sections that can be assembled together. The opening is divided into end sections that can be joined after insertion, allowing the heating element to be accommodated within the segmented envelope structure without requiring complex pre-assembly operations.
2Ease of manufacture
If the envelope is made open with an opening in the profile to facilitate insertion, then assembly simplicity is improved, but the envelope interior volume increases which may affect thermal efficiency
Solution Approach 1:
The opening is created in advance during envelope manufacturing as a pre-formed feature. This preliminary action allows the PTC heating element to be inserted from the outside without requiring complex assembly operations, while the opening is designed to minimize the increase in envelope interior volume by being positioned and sized optimally.
Solution Approach 2:
The envelope opening is positioned in a specific dimensional location (in the profile perpendicular to the extension direction) to facilitate insertion while minimizing impact on the envelope interior volume. The opening is strategically placed to allow access without significantly increasing the overall envelope volume.
3Reliability
If the envelope is closed after insertion to ensure thermal contact, then thermal coupling is improved, but manufacturing complexity increases due to additional bonding operations
Solution Approach 1:
The envelope is pre-formed with an open profile that allows the PTC heating element to be inserted from the outside. The opening is created in advance during envelope manufacturing, enabling the heating element to be positioned and contacted with the envelope surface before final closure, thus simplifying the assembly process while ensuring thermal coupling.
Solution Approach 2:
The closure operation is merged with the final assembly step. The end sections of the envelope are joined together by material bonding in a single operation that simultaneously closes the opening and completes the envelope structure, eliminating the need for separate closure operations and simplifying manufacturing.
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 design achieves improved thermal coupling and simplified assembly, ensuring efficient heat dissipation and enhanced manufacturability of PTC heating devices.
Implementation Method 1
When an electrical voltage is applied to the contact plates, the PTC thermistor generates heat
Implementation Method 2
a thermally conductive adapter layer made of an electrically insulating material, which is arranged on an outer surface of each of the two contact plates
Implementation Method 3
the heat generated by the PTC heating element can also be efficiently dissipated to the external environment of the PTC heating device
Data Source
Figure 1~3
AI summary
The invention relates to a PTC heater (1) with an electrically energizable PTC heating element (2), comprising a block-shaped PTC thermistor (3) having two opposing contact surfaces (4a, 4b), on each of which there is an electrical contact plate (5a, 5b) for electrically contacting the PTC thermistor (3) with an electrical power supply. The PTC heating element (2) also has a thermally conductive adapter layer (6a, 6b) made of an electrically insulating material, each of which is arranged on an outer surface (14a, 14b) of the two contact plates (5a, 5b) facing away from the PTC thermistor (3). The PTC heater (1) further comprises an envelope (7) of a metal extending along an extending direction (ER) and surrounding an envelope inner space (8) in which the PTC heating element (2) is arranged. The envelope (7) is open at its two ends opposite in the direction of extension (ER) and, in profile perpendicular to the direction of extension (ER), has two end sections (11a, 11b) which can be connected to one another by material bonding. In the profile, the envelope (7) lies flat against the two opposing adapter layers (6a, 6b).