Low-noise negative pressure fan convenient to install

The utility model discloses a low-noise negative pressure fan convenient to install, which belongs to the technical field of machining and comprises an installation base and an installation frame installed on the top of the installation base, and a low-noise negative pressure fan body is installed on the inner side of the installation frame. A mounting assembly is mounted on the inner side of the mounting frame, the mounting assembly comprises a screw rod in threaded connection to the center of the top of the mounting frame and a fixing plate mounted at the bottom of the screw rod through a bearing, the fixing plate abuts against the top of the negative pressure fan body, and four supporting rods are connected to the top of the fixing plate in a rectangular distribution mode; the supporting rods are movably inserted into the corresponding sides of the mounting frame, an inserting groove is formed in the top of the mounting base, an inserting plate inserted into the inner side of the inserting groove is mounte