AXIAL-CENTRIFUGAL SECTIONAL FAN (EMBODIMENTS) Russian patent published in 2024 - IPC F04D25/10 

FIELD: machine building.

SUBSTANCE: invention relates to the field of fan engineering and can be used in mine and tunnel ventilation systems. Axial-flow sectional fan comprises a base and an expandable section, each of which has a casing, an impeller with blades placed in it on the shaft, and the base section is made in the form of an axial fan with a straightener, wherein said sections are detachably interconnected. Axial-flow sectional fan is equipped with at least one additional section made in the form of an axial fan and containing a casing, an impeller with blades placed in it on the shaft and a straightener. Output of the additional section is connected to the input of the base section with the possibility of disconnection, and the expandable section is made in the form of a centrifugal fan. Embodiment is possible, in which an axial-centrifugal sectional fan, comprising a base and an expandable section, each of which has a casing and an impeller with blades placed in it on the shaft, and the base section is made in the form of an axial fan with a straightener, wherein the above sections are connected to each other with the possibility of disconnection. Axial-flow sectional fan is equipped with at least one additional section made in the form of an axial fan and containing a casing, an impeller with blades placed in it on the shaft and a straightener. Inlet of the additional section is connected to the outlet of the base section, and the outlet of the additional section is connected to the inlet of the expandable section with the possibility of disconnection, wherein the expandable section is made in the form of a centrifugal fan. Effect of the embodiments is the same.

EFFECT: solving the problem of increasing the fan operating efficiency by expanding the scope of its application by increasing the adaptive capabilities of the fan to the varying aerodynamic parameters of the ventilation network.

3 cl, 3 dwg