A ceiling-inserted fan includes a case having an air inlet on a bottom surface of the case and an air outlet on a side surface of the case, an adapter plate having a rectangular opening and forming at least part of the side surface of the case, a duct-connecting adapter protruding outward the adapter plate and an air-sending part for directing air from the air inlet to the air outlet. The duct-connecting adapter is separated from the adapter plate and includes a sealing section that contacts with a peripheral section of the rectangular opening inside the case and a locking section that contacts with the peripheral section of the rectangular opening outside the case. The sealing section and the locking section removably holds the peripheral section.

A fan frame electrical connector structure is configured for assembling to a motherboard of an electronic device and includes a fan having a frame. The frame is provided with at least one pogo pin connector, which is located at one side of the frame to project into an outer side of the frame. The motherboard of the electronic device is provided at a position corresponding to the pogo pin connector with at least one metal contact, and the pogo pin connector is electrically connected to the metal contact. With the above fan frame electrical connector structure, it is possible to realize automated assembling of the fan to the electronic device motherboard.

A fan frame electrical connector structure is configured for assembling to a motherboard of an electronic device and includes a fan having a frame. The frame is provided with at least one pogo pin connector, which is located at one side of the frame to project into an outer side of the frame. The motherboard of the electronic device is provided at a position corresponding to the pogo pin connector with at least one metal contact, and the pogo pin connector is electrically connected to the metal contact. With the above fan frame electrical connector structure, it is possible to realize automated assembling of the fan to the electronic device motherboard.

A centrifugal heat dissipation fan including a housing and an impeller is provided. The housing has at least one flow inlet. The impeller assembled in the housing and rotating about an axial direction includes a hub and a plurality blades disposed around the hub. The flow inlet is located in the axial direction and faces the hub. Each of the blades has a wing tab next to the flow inlet, and the wing tab extends from a main surface of the blade to another blade. The wing tab has an inclined surface facing toward a periphery of the flow inlet along a radial direction of the impeller.

A centrifugal heat dissipation fan including a housing and an impeller is provided. The housing has at least one flow inlet. The impeller assembled in the housing and rotating about an axial direction includes a hub and a plurality blades disposed around the hub. The flow inlet is located in the axial direction and faces the hub. Each of the blades has a wing tab next to the flow inlet, and the wing tab extends from a main surface of the blade to another blade. The wing tab has an inclined surface facing toward a periphery of the flow inlet along a radial direction of the impeller.

A blower assembly for a powered air-purifying respirator (PAPR) assembly includes: a lower housing; an upper housing connected to the lower housing, such that the upper housing and the lower housing collectively define a first interior cavity; a filter configured to filter ambient air drawn into the blower assembly; and a fan. The upper housing and the filter define a pathway for a flow of air into the first interior cavity. The fan is positioned in the first interior cavity such that, when the fan is activated, ambient air is drawn into the blower assembly and travels along the pathway into the first interior cavity for subsequent delivery out of the blower assembly. The lower housing defines an outlet port for directing breathable air out of the blower assembly for delivery to a user (e.g., via a breathing tube interconnecting a headpiece and the outlet port).

A blower assembly for a powered air-purifying respirator (PAPR) assembly includes: a lower housing; an upper housing connected to the lower housing, such that the upper housing and the lower housing collectively define a first interior cavity; a filter configured to filter ambient air drawn into the blower assembly; and a fan. The upper housing and the filter define a pathway for a flow of air into the first interior cavity. The fan is positioned in the first interior cavity such that, when the fan is activated, ambient air is drawn into the blower assembly and travels along the pathway into the first interior cavity for subsequent delivery out of the blower assembly. The lower housing defines an outlet port for directing breathable air out of the blower assembly for delivery to a user (e.g., via a breathing tube interconnecting a headpiece and the outlet port).

A centrifugal pump includes a motor portion including a rotor rotatably disposed in a rotor chamber and includes a pump portion including an impeller rotatably disposed in a pump chamber. The impeller is coupled to the rotor. The centrifugal pump also includes a casing that separates the rotor chamber from the pump chamber, and a bearing that rotatably supports a rotor shaft of the rotor and to which grease is supplied is provided. Two communication holes extend through the casing and provide fluid communication between the rotor chamber and the pump chamber.

A centrifugal pump includes a motor portion including a rotor rotatably disposed in a rotor chamber and includes a pump portion including an impeller rotatably disposed in a pump chamber. The impeller is coupled to the rotor. The centrifugal pump also includes a casing that separates the rotor chamber from the pump chamber, and a bearing that rotatably supports a rotor shaft of the rotor and to which grease is supplied is provided. Two communication holes extend through the casing and provide fluid communication between the rotor chamber and the pump chamber.

A blowing device is equipped with a blowing portion and a holder. The blowing portion has a cylindrical body that stores a rotating body, and includes: a suction inlet arranged on a side surface perpendicular to the axial direction of the cylindrical body; and an exhaust outlet arranged on a part of the peripheral surface of the cylindrical body. The holder has a wall that faces the peripheral surface of the blowing portion with a gap between the wall and the peripheral surface, and holds the blowing portion inside. The holder includes: a suction portion that communicates with the suction inlet; and an exhaust portion that causes the exhaust outlet to communicate with the outside and the gap.