Miniature thermistor sensor packaging method

Abstract

The invention relates to the field of thermistor sensing technology, and in particular to a miniature thermistor sensor packaging method. Included are a metal probe, a silica gel head, a thermistor, leads, and a positioning bracket. The steps are as follows: a, welding the leads to pins of the thermistor; b, assembling the silica gel head on an upper port of the metal probe, and injecting a smallamount of sealant into the metal probe and the silica gel head; c, integrally assembling the thermistor and the positioning bracket, with the upper end of the bracket abutting against the thermistor;d, grabbing the thermistor and the positioning bracket into the metal probe by a manipulator; and e, starting sealant filling using a glue injection needle on the manipulator through a through hole inthe positioning bracket while the step d is carried out. According to the invention, the structure is reasonable, the insertion depth of the thermistor can be determined by grabbing the positioning bracket during installation, the sealant does not produce bubbles and can accelerate the filling speed, the curing cycle is shortened, the production efficiency can be increased and the electrical insulation performance of the sensor can be improved.

Description

technical field [0001] The invention relates to the technical field of thermal sensing, in particular to a packaging method for a miniature thermal probe. Background technique [0002] With the rise of smart home appliances, electric heating appliances are generally equipped with various sensors and micro-processing terminals, so as to realize the purpose of self-adjusting the heat and controlling the cooking program. The temperature sensor is the core of intelligent control. The temperature sensor used in electric heating appliances is generally a top temperature-sensing probe, which senses the heat and cooking progress through direct contact. The lead wires lead out from the opening of the housing and are insulated with sealant. [0003] Since the temperature-sensing probe needs to be exposed to water vapor, its temperature-sensing shell needs to meet the requirements of food safety standards, so it is mostly made of stainless steel or aluminum, and the cost is relatively...

AI Technical Summary

Problems solved by technology

[0003] Since the temperature-sensing probe needs to be exposed to water vapor, its temperature-sensing shell needs to meet the requirements of food safety standards, so it is mostly made of stainless steel or aluminum, and the cost is high

With the development of temperature sensing technology, in order to adapt to the overall design of the electric heating capacitor, the product structure has become smaller and smaller, and the complex shape processing of the metal probe has become more and more difficult; the pins of the thermistor need to be welded and penetrated The temperature-sensing probe, its welding part is close to the metal shell, which leads to insufficient insulation and insufficient electrical safety protection; the diameter of the metal shell is small, and it has a certain length to ensure the embedment depth of the lead wire, which leads to the filling of the sealant It is more difficult, as air bubbles are prone to appear in the metal shell and affect the insulation performance, and the air bubble removal process requires a long curing time for the sealant, which further prolongs the assembly cycle and reduces production efficiency

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