Constant temperature and constant-humidity test box

Abstract

The invention relates to the technical field of test devices, in particular to a constant-temperature and constant-humidity test box. The constant-temperature and constant-humidity test box comprises a barrel-shaped test chamber arranged in a vertical direction, a base, a heating device, a refrigerating device, a humidifying device and a balance weight piston, and the base is provided with a support used for installing a sample; a test space is formed in the test cabin and is positioned between the counterweight piston and the base; the humidifying device is used for adding wet air into the test space, the humidifying device comprises an atomizing device and a compressor, the atomizing device atomizes water in the water tank to generate water vapor, and the compressor presses the water vapor into the test space; and the test box further comprises a circulating fan, a honeycomb rotating wheel, a temperature sensor, a humidity sensor and a controller. According to the constant-temperature and constant-humidity test box, after water vapor is condensed and liquefied, due to the fact that the balance weight piston can freely slide under the action of gravity, the air pressure in the test chamber is kept constant, and the air pressure in the test chamber can be kept stable without an air pressure sensor.

Description

technical field [0001] The invention relates to the technical field of testing devices, in particular to a constant temperature and humidity test chamber. Background technique [0002] The constant temperature and humidity test chamber is a kind of equipment that tests the performance of the product under a certain constant temperature and humidity state to test whether the performance of the product meets the requirements of the relevant standards. [0003] During the test, in order to achieve the preset temperature and humidity, the constant temperature and humidity test chamber needs to be equipped with corresponding temperature adjustment devices and humidity adjustment devices to adjust the temperature and humidity. However, there are currently testing requirements for constant temperature, humidity, and pressure. The existing constant temperature, humidity, and pressure test chambers rely on the PID closed-loop control system. After the sensor detects the air pressure ...

AI Technical Summary

Problems solved by technology

However, there are currently testing requirements for constant temperature, humidity, and pressure. The existing constant temperature, humidity, and pressure test chambers rely on the PID closed-loop control system. After the sensor detects the air pressure in the target space, it feeds back to the controller, and the controller controls whether to adjust the pressure. , which has the following disadvantages: it is highly dependent on the air pressure sensor. When the sensor cannot sense accurately, the closed-loop control system cannot control the air pressure stably and cannot be tested.

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