Air inlet adjustment structure of negative pressure regulator

Abstract

A negative pressure regulator includes a regulator body, a pressure relief nut, and a swivel assembly. The regulator body includes a valve body and a cylinder connected to the valve body. The valve body includes an airflow passage. The cylinder includes a mounting hole and an air inlet communicating with the airflow passage. The pressure relief nut is disposed in the mounting hole and includes a relief hole and an air outlet connected with each other. The swivel assembly includes a cap and a knob connected with each other. The cap covers the cylinder and is rotatable relative to the valve body. The knob is inserted in the pressure relief nut and driven by the cap to optionally move away from the air outlet. When the air flowing into the airflow passage is adjusted, the airflow rate and noise may be reduced.

Dependencies are inferred from the claim text.