Air supply principle and pressure control method of constant temperature and humidity machine

The constant temperature and humidity chamber is used to simulate whether the product's adaptability and characteristics are changed and the reliability and temperature and humidity environment test are tested under high temperature and high humidity conditions. The equipment has high temperature storage; low temperature storage; high and low temperature circulation; constant temperature and humidity. It is used to test various materials for heat resistance, cold resistance, dry resistance and moisture resistance. Suitable for electronics, electrical appliances, communications.

Most users have questions about how the constant temperature and humidity machine delivers air. Is it a supply duct? Or is it directly blown out like an air conditioner? In fact, whether it is a constant temperature and humidity machine or a cabinet air conditioner, it is blown out from the fan and then returns to the wind from below. The constant temperature and humidity machine is also blown out by the fan, and the heat is taken away from the return air return plate through the evaporator. If it is a constant temperature and humidity room, the space is relatively large, there is a special air duct to blow down, and then return from the main air return plate, generally according to the size of the space, calculate the top needs to install several exhaust vents.

The constant temperature and humidity machine has two kinds of control: high and low pressure control and single high pressure control, and different control is selected according to different needs. So what is the role of each of them, how is it controlled?

In the constant temperature and humidity machine , whether it is high and low pressure control or single high pressure control, it is generally used to protect the compressor. High-pressure voltage control is to prevent the compressor from damaging the compressor due to excessive current and excessive pressure when the load on the pressure system (high-pressure end) is too large. The low-pressure pressure control is to prevent the pressure at the return port (low-pressure end) from being too high and the valve is damaged. Compressor ; of course, there is also a kind of over-pressure control, that is, when the pressure is lower than a certain pressure, it is generally a negative pressure value to avoid compressor idling damage. The single high-pressure voltage control is because the general equipment has been adjusted, and the dose of the system refrigerant has been adjusted. Under normal circumstances, it is impossible to have a low pressure, and it is impossible to damage the compressor. This is mainly to simplify the circuit. And save costs. However, in the case of repair, it should be noted that excessive refrigerant should not be charged .

"Knowing oneself and knowing oneself, there is no war." Only when you fully understand the equipment of the constant temperature and humidity machine can you avoid unnecessary mistakes and use the machine more reasonably and safely.