Miniature thermo-sensitive flexible probe

Abstract

The invention belongs to the temperature-controlled sensing technological field and relates to a miniature thermo-sensitive flexible probe. The probe includes a metal probe, a thermistor, and a silicagel head; the silica gel head includes a hemispherical portion at the upper part of the silica gel head, a busing portion at the middle of the silica gel head, and an annular edge portion arranged atthe lower part of the silica gel head; the thermistor is arranged in the silica gel head in a manner that the thermistor passes through the silica gel head; the upper end of the thermistor abuts against the inner wall of the hemispherical portion; the wall thickness of the hemispherical portion is gradually increased from the periphery of the hemispherical portion to the center of the upper end of the hemispherical portion; a positioning mechanism of the thermistor and the silica gel head is arranged in the metal probe; and gaps in the inner cavities of the metal probe and the silica gel headare filled with a sealant. The miniature thermo-sensitive flexible probe is reasonable in structure. The elastic variable of the hemispherical portion can increase the contact area of the sensor, theheat of the thermistor is mainly transmitted by the silica gel head, and therefore, thermal response sensitivity can be improved, the difference of conduction rate stability is small, and the accuracy of temperature sensing can be improved; and the inner end of the thermistor is fixed and limited to a center position by a limiting ring, and pins, leads and solder joints are wrapped with an insulated bushing, and therefore, the electrical insulation of the sensor can be ensured.

Description

technical field [0001] The invention relates to the technical field of temperature control sensing, in particular to a miniature thermosensitive flexible 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 rela...

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 the product structure to the overall design of the electric heating capacitor, the temperature sensing probe is getting smaller and smaller, and the complex shape processing of the metal probe is becoming more and more difficult.

However, the contact between the top heat conduction surface of the rigid probe and the electric heating appliance is insufficient, the contact surface between the thermistor and the probe is smaller, and the heat conduction efficiency is more realized by the sealing gel filling the gap, and the contact gap between the thermistor and the probe exists. If there is a difference, the thickness of the filling colloid is different, so that the thermal response speed is limited, and the thermal response speed of the sensor also has a certain difference; Penetrating the temperature sensing probe, the welding part is too close to the metal shell, resulting in insufficient insulation and insufficient electrical safety protection

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