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Solution to the failure of the snap-type thermostat

Article Source:Thermal protectorAuthor:YaxunPopularity:Published time:2019-11-04 17:52

The snap-on thermostat is a very common thermostat, but during use, we occasionally encounter a sudden thermostat failure. So how do we solve this situation?
Yaxun Electronics here to share with you the solution to the failure of the snap-type thermostat, let's get to know it!

Failure analysis of manual reset snap-type thermostat

Solution to the failure of the snap-type thermostat
1. The cleanliness and finish of the contact surface have a great influence on the working state of the contact. When the surface of the contact is rough or there is excess on the contact, it is easy to cause arcing and reduce the life of the contact. Therefore, the part cleaning process should be improved to eliminate unnecessary materials; Increase the process of unwanted material screening to improve the quality and reliability of the thermostat.

2. Improve the surface cleanliness and finish of the contacts. In the daily work, the cleaning of the contact surface should be strengthened to remove oxides, thereby improving the quality and life of the snap-on thermostat.

3. Select the material suitable for the working environment of the contact in the material selection of the contact. AgNi15 contact materials are recommended for working environments with large loads, and Ag contact materials can be used for environments with small loads.


4. According to the working mechanism analysis of the reed. Reasonable design of the structure of the reed, selection of the reed with appropriate stiffness, and the correct position of the action point of the push rod are particularly important for improving the performance of the thermostat.

5. In the design of the action point of the reed push rod, in order to avoid the phenomenon of cracking, the rounded corner of the reed can be smoothed to avoid stress concentration.

6. The occurrence of cracks at the bend of the spring, because the fatigue strength caused by insufficient. Therefore, increasing the fatigue strength of the reed is a solution to avoid this situation.

7. The influence of hot bimetal on the temperature control of the snap-type thermostat is more obvious. Therefore, the hot bimetal should be heat treated multiple times to increase its fatigue resistance.

8. The hot bimetal needs to be strictly controlled for the two parameters, which are the circumscribed circle radius and the arch height. Reasonably good control of the two parameters help to reduce the probability of occurrence of drift in thermal bimetal sheet.