An explosion-proof apparatus with an explosion-proof housing and a cooling device. The explosion-proof housing has a plurality of outer walls enclosing a housing interior. A pressure-relief arrangement of the cooling device has at least one pressure relief opening with at least one gas-permeable, flameproof pressure-relief body. The pressure-relief opening passes through at least one of the outer walls. The cooling device also has at least one heat sink which forms at least one heat sink wall part of one the outer walls and which, as a heat sink wall part of this outer wall, directly borders, on its outer face, the surrounding area and directly borders, on its inner face, the housing interior.

A generator enclosure for an engine-generator includes multiple walls defining at least one air path. In one example, a first wall includes an exhaust path for the engine-generator, and a second wall includes an intake path for the engine-generator. The generator enclosure may include at least one air flow frame associated with the exhaust path or the intake path and at least one movable wall supported by the at least one air flow frame, At least one thermal fuse may be coupled to the at least one movable wall and configured to release the at least one movable wall to block the exhaust path or the intake path.

Disclosed herein are pressure attenuator devices for rotating electrical machines, The pressure attenuation device contains a screen with a plurality of openings, wherein the screen is positioned within the internal cavity and configured to segregate a flame front propagating from an ignition source formed by a combustion process originated in the cavity. Thus, with the use of the pressure attenuation device, an expressive reduction of pressure inside the cavity of the rotating electrical machine is obtained.

Disclosed herein are pressure attenuator devices for rotating electrical machines, The pressure attenuation device contains a screen with a plurality of openings, wherein the screen is positioned within the internal cavity and configured to segregate a flame front propagating from an ignition source formed by a combustion process originated in the cavity. Thus, with the use of the pressure attenuation device, an expressive reduction of pressure inside the cavity of the rotating electrical machine is obtained.

An explosion proof actuator assembly and servo system is described. Embodiments of the present invention include an explosion proof actuator assembly and servo system that may implement a rotating nut and a threaded member to effectuate an opening and closing of a valve.

Disclosed is a rear grill assembly for a box fan including a rear grill, an electric motor support positioned on the rear grill by a positioning structure, and a frame arranged on the periphery of the rear grill by a snap structure. The frame includes a bottom cover, a top cover, and two side boards connected between the bottom cover and the top cover. The electric motor support is positioned on the rear grill by the positioning structure so that the electric motor support can be mounted easily and firmly. Thus, shortening the time for mounting the motor support, and improving the efficiency for mounting the rear grill assembly. Moreover, since the bottom cover, the top cover and the two side boards are assembled to form a frame, each part can be produced separately, whereby the difficulty in producing the frame is decreased to a certain extent.

Disclosed is a rear grill assembly for a box fan including a rear grill, an electric motor support positioned on the rear grill by a positioning structure, and a frame arranged on the periphery of the rear grill by a snap structure. The frame includes a bottom cover, a top cover, and two side boards connected between the bottom cover and the top cover. The electric motor support is positioned on the rear grill by the positioning structure so that the electric motor support can be mounted easily and firmly. Thus, shortening the time for mounting the motor support, and improving the efficiency for mounting the rear grill assembly. Moreover, since the bottom cover, the top cover and the two side boards are assembled to form a frame, each part can be produced separately, whereby the difficulty in producing the frame is decreased to a certain extent.

A rotary electric machine in which a capacitor does not explode even if heat is generated in the capacitor, is provided. A heat sink includes a recess-shaped capacitor housing portion having an inner peripheral side surface joined to an outer peripheral side surface of a capacitor via a capacitor heat dissipation material, and the capacitor housing portion includes an explosion-proof valve recess located at a position facing an explosion-proof valve of the capacitor, and a communication passage providing communication between a drive circuit board and the explosion-proof valve.

A rotary electric machine in which a capacitor does not explode even if heat is generated in the capacitor, is provided. A heat sink includes a recess-shaped capacitor housing portion having an inner peripheral side surface joined to an outer peripheral side surface of a capacitor via a capacitor heat dissipation material, and the capacitor housing portion includes an explosion-proof valve recess located at a position facing an explosion-proof valve of the capacitor, and a communication passage providing communication between a drive circuit board and the explosion-proof valve.

A fluid transfer pump assembly that includes a motor enclosure assembly that forms a motor cavity sized to receive a motor. The motor enclosure includes a flame path that extends from an interior joint to an exterior joint. The interior joint faces the motor cavity and the exterior joint faces exterior of the motor enclosure assembly. A heat sink is located in the motor cavity of the motor enclosure assembly. A portion of the heat sink abuts the interior joint.