2results about How to "Increase air speed" patented technology

This invention discloses a comprehensive performance testing system for an electronic expansion valve. One end of an electric proportional valve is connected to the outlet of a gas storage tank via a booster pump, and the other end is sequentially connected to valve 1, a first pressure sensor, valve 3, valve 6, a second pressure sensor, a stepping solenoid valve, valve 8, and a first flow meter. One end of valve 2 is connected between valve 1 and the first pressure sensor, and the other end is left unconnected. One end of valve 5 is connected to the connection point of valve 3 and the first pressure sensor, and the other end is connected to one end of valve 4. The other end of valve 4 is connected to the connection point of valve 6 and the second pressure sensor. One end of valve 7 is connected between the first pressure sensor and the stepping solenoid valve, and the other end is left unconnected. One end of valve 9 is connected between the stepping solenoid valve and valve 8, and the other end is connected to the second flow meter. The inlet and outlet of the electronic expansion valve under test are connected between valve 3 and valve 6, and between valve 5 and valve 4, respectively.

The application discloses a ventilation cabinet, comprising a cabinet body, a make-up air system, an upper make-up air module, and an upper outer make-up air outlet arranged towards a partition passage on the top side of an inner cavity, wherein the upper outer make-up air outlet is not arranged to make up air from outside a window. The application can improve the air flow organization of the inner cavity and prevent leakage of pollutants of the ventilation cabinet.