Instantaneous heater with self-destroying overheat protection structure

By setting an asymmetrical flow channel and a thermal stress-induced structure in the instantaneous liquid heater, the ceramic heating element breaks under abnormal operating conditions, solving the reliability and safety problems of existing protection methods and realizing a self-destructive permanent circuit disconnection, which is suitable for space-constrained scenarios such as smart toilets.

CN122149081APending Publication Date: 2026-06-05CHANGHE SMART HOME (JIAXING) CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGHE SMART HOME (JIAXING) CO LTD
Filing Date
2026-03-10
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing instantaneous liquid heaters rely on electronic or mechanical components for overheat protection, which has reliability issues and may pose safety hazards in case of failure, especially when heating is continuous in the absence of water or when water is interrupted.

Method used

A self-destructing overheat protection structure is adopted. By setting asymmetrical flow channels and thermal stress-induced structures in areas with poor thermal conductivity on the surface of the ceramic heating element, the ceramic heating element is physically fractured under abnormal overheating conditions, disconnecting the conductive heating circuit and achieving permanent protection.

Benefits of technology

It can reliably disconnect the circuit under both water-heating and waterless dry-burning conditions, avoiding protection failures caused by sensor malfunction or control circuit failure, ensuring safety and reliability, while not occupying extra space, making it suitable for space-constrained applications.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122149081A_ABST
    Figure CN122149081A_ABST
Patent Text Reader

Abstract

The application discloses an instant heater with a self-destroying overheating protection structure, comprising a heater shell and a ceramic heating sheet. The ceramic heating sheet comprises two layers of insulating ceramic substrates and an electrically-conductive heating loop sintered between the two layers. The heater shell is provided with a thermal stress inducing structure in contact with a local area of the outer surface of the insulating ceramic substrate. The thermal stress inducing structure is configured to form an asymmetric flow channel and / or a local poor heat conduction area on the surface of the ceramic heating sheet. When an abnormal overheating condition occurs in the flow heating cavity, the thermal stress inducing structure induces thermal stress or bending stress inside the ceramic heating sheet, causing the ceramic heating sheet to physically break, thereby permanently disconnecting the electrically-conductive heating loop. The application realizes overheating protection through a physical self-destroying mechanism, does not rely on electronic components or movable parts, effectively reduces the risk of protection failure caused by sensor failure or control circuit failure, and realizes intrinsic safety in structure.
Need to check novelty before this filing date? Find Prior Art