Constant temperature and humidity testing machine

Abstract

The invention discloses a constant-temperature and constant-humidity test machine. The constant-temperature and constant-humidity test machine comprises a test machine casing, wherein a test box is arranged in the test machine casing, the test box comprises a box body and a test chamber which is arranged in the box body, a circulating air duct is formed between the box body and the test chamber, the circulating air duct is communicated with the test chamber, gas uniform distribution devices are respectively arranged at an air inlet and an air outlet of the circulating air duct, each gas uniform distribution device comprises a first meshed plate and a second meshed plate which are sequentially arranged towards the interior of the circulating air duct, a plurality of mesh holes are respectively formed in the first meshed plate and the second meshed plate, and the hole diameters of the mesh holes of the second meshed plate are sequentially reduced from the upper part to the lower part, or the number of the mesh holes of the second meshed plate is sequentially reduced from the upper part to the lower part. The flow speed of gas from the upper part to the lower part can be controlled through the first meshed plate and the second meshed plate so as to ensure uniform gas flow in the test chamber and avoid air flow turbulence phenomena. As a result, the constant-temperature and constant-humidity test machine can meet the requirement of low-flow rate tests.

Description

technical field [0001] The invention relates to the technical field of testing devices, more specifically, to a constant temperature and humidity testing machine. Background technique [0002] The constant temperature and humidity testing machine is a kind of equipment that tests the performance of the product under a certain constant temperature and humidity state to check whether the performance of the product meets the requirements of the relevant standards. [0003] The shell of the existing constant temperature and humidity testing machine is generally equipped with a test box. The test box includes a box body and a test cabin arranged inside the box body. A circulating air duct is formed between the box body and the test cabin. The test chamber is connected, and the interior of the circulating air duct is equipped with an evaporator, a heater, a humidifier and a circulating fan. When working, the gas will flow between the test chamber and the circulating air duct unde...

AI Technical Summary

Problems solved by technology

When working, the gas will flow between the test chamber and the circulating air duct under the action of the circulating fan. However, during the flow of the gas, most of the gas will sink and gather at the bottom of the circulating air duct. When the gas returns to the test chamber, the gas flow velocity at the bottom of the test chamber will be relatively large, which is prone to air flow disturbance, making the constant temperature and humidity testing machine unable to meet the low flow rate test requirements

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