Temperature and humidity sensor

Abstract

The invention relates to the technical field of temperature and humidity sensing devices and specifically relates to a temperature and humidity sensor. The temperature and humidity sensor comprises a hollow packaging shell, a PCB board is arranged in the packaging shell, a front part of the PCB board is provided with a humidity sensitive chip, a panel of the packaging shell is provided with a detection window, and the PCB board is provided with a shaping frame and a setting frame that have ring sleeve structures; the shaping frame, the setting frame and the detection window are orderly mounted in a nested manner with interference fits being formed among the same; the shaping frame is arranged at periphery of the humidity sensitive chip in an annular manner and is connected with the PCB board in a matched manner, an upper port of the shaping frame is covered with a filter membrane, and an edge of the filter membrane is clamped between the shaping frame and the setting frame; the temperature and humidity sensor is reasonable in structure, sealant applied on packaging openings can be reduced via use of an inner cavity of a partitioned packaging shell of a threading plate,, the PCB board is fixed via a guiding groove in the packaging shell, the shaping frame and the setting frame cooperate with the filter membrane to fulfill sealing protection around the humidity sensitive chip, packaging efficiency and effects can be improved, and normal state steam outflow is formed on the detection window; protection performance, sensitivity and reliability are further improved.

Description

technical field [0001] The invention relates to the technical field of temperature and humidity sensing devices, in particular to a temperature and humidity sensor. Background technique [0002] Industrial and agricultural production, meteorology, environmental protection, national defense, scientific research, aerospace and other departments often need to measure and control the environmental humidity. Among the conventional environmental parameters, humidity is the most difficult parameter to measure accurately. The humidity sensor is a sensing device that collects moisture data in the air through a humidity sensor. It feeds back to the central processor through digital and analog signals, so that a series of dehumidification, humidification and other measures are taken to make the environment reach an ideal state. [0003] In order to obtain a more accurate detection value, the humidity sensitive chip is often directly exposed to the environment to be tested, because the ...

AI Technical Summary

Problems solved by technology

However, the packaging procedure is complicated, the yield rate is low, and the interference between the protective structures of each layer will easily lead to a decrease in the detection sensitivity of the humidity chip and an excessive measurement deviation.

Existing humidity sensors still have many deficiencies in measurement accuracy control and environmental tolerance, and the complex packaging structure leads to low production efficiency and yield

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