2results about How to "Play a noise reduction effect" patented technology

This invention relates to a low-noise optical module three-temperature testing device, comprising a test box with a test cavity formed inside. An air inlet pipe is connected to the test box and communicates with the test cavity. A first silencing cavity is also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity is provided on the test box. A duct is also connected to the test box, connecting the test cavity and the first silencing cavity. By setting up the first silencing cavity and connecting it to the test cavity via the duct, this invention not only extends the gas flow path within the test box and serves to store airflow, but also significantly increases the gas flow area and the diffuse reflection area and number of reflections within the test box, thereby reducing gas velocity and noise energy, achieving noise reduction. The test cavity-duct-first silencing cavity can form a Venturi effect, resulting in better noise reduction.

This application relates to an anti-backflow control device, comprising: a valve body with a through channel inside; a valve seat fixed to one end of the valve body and having its inner cavity connected to the internal channel of the valve body, wherein one end of the inner cavity of the valve seat is formed with a valve port; a valve sleeve disposed inside the valve body and coaxially fixedly connected to the valve body, wherein a fixed sleeve is provided at the center of the valve sleeve and extends away from the valve port; a guide sleeve, one end of which is fixed inside the fixed sleeve and the other end of which extends towards the valve port; a guide sleeve, one end of which is fixed inside the fixed sleeve and the other end of which extends towards the valve port; and a valve core assembly that slides with the guide sleeve, wherein the valve core assembly is configured to cooperate with the valve port. This invention enables the valve sleeve to be coaxially connected to the valve body, and the fixed sleeve guides the movement of the valve core assembly, thereby avoiding valve core jamming and leakage during valve closure due to concentricity differences, which improves the valve's response flexibility and extends its service life.