An explosion-proof housing 10 having at least one pressure relief body 15 arranged in a pressure compensation vent opening 14 of one of the housing parts 12, 13. In order to secure the pressure relief body 15 to the housing part 12, a thickened region 20 of the housing part 12 engages over an edge zone 24 of the pressure relief body 15 along its entire peripheral surface 23 on both of its flat sides 16, 17. A resulting engaging depth Si, which is measured parallel to the flat sides 16, 17, is preferably greater than a thickness D1, D2 of the part of the thickened region 20 engaging over the edge zone 24. The pressure relief element 15 consists of sintered wire mesh. This connection is pressure-resistant and stable over a wide temperature range.

An explosion-proof housing 10 having at least one pressure relief body 15 arranged in a pressure compensation vent opening 14 of one of the housing parts 12, 13. In order to secure the pressure relief body 15 to the housing part 12, a thickened region 20 of the housing part 12 engages over an edge zone 24 of the pressure relief body 15 along its entire peripheral surface 23 on both of its flat sides 16, 17. A resulting engaging depth Si, which is measured parallel to the flat sides 16, 17, is preferably greater than a thickness D1, D2 of the part of the thickened region 20 engaging over the edge zone 24. The pressure relief element 15 consists of sintered wire mesh. This connection is pressure-resistant and stable over a wide temperature range.

A hydrogen recirculation blower is used in a hydrogen return arrangement in a fuel cell system. The blower includes a rotatable rotor with an end region on which an impeller is arranged, and a stator with coil windings and with a hydrogen barrier which is formed as a hollow body. The rotor is arranged in a cavity of the hydrogen barrier, with the hydrogen barrier running both between the rotor and the coil windings and between the impeller and the coil windings. The rotor and the stator form an electric motor for driving the impeller.

A hydrogen recirculation blower is used in a hydrogen return arrangement in a fuel cell system. The blower includes a rotatable rotor with an end region on which an impeller is arranged, and a stator with coil windings and with a hydrogen barrier which is formed as a hollow body. The rotor is arranged in a cavity of the hydrogen barrier, with the hydrogen barrier running both between the rotor and the coil windings and between the impeller and the coil windings. The rotor and the stator form an electric motor for driving the impeller.

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.

Intrinsically safe and explosion proof enclosure platforms for convertible gas detectors are disclosed. In some embodiments, a convertible gas detector comprises a gas sensor, the gas sensor comprising sensor circuit. The gas detector further comprises an enclosure, the enclosure configured to house the sensor circuit. The gas sensor further comprises an end cap, the end cap configured to be detachably connected to the enclosure along a flamepath joint. The gas detector is configured to switch between operating as an explosion proof detector and an intrinsically safe detector responsive to whether the end cap is connected to the enclosure.

Intrinsically safe and explosion proof enclosure platforms for convertible gas detectors are disclosed. In some embodiments, a convertible gas detector comprises a gas sensor, the gas sensor comprising sensor circuit. The gas detector further comprises an enclosure, the enclosure configured to house the sensor circuit. The gas sensor further comprises an end cap, the end cap configured to be detachably connected to the enclosure along a flamepath joint. The gas detector is configured to switch between operating as an explosion proof detector and an intrinsically safe detector responsive to whether the end cap is connected to the enclosure.

A housing with an inner lining, made of an open-pore material, preferably covering at least two sides of the housing, for the reduction of internal explosion pressure. In addition, or alternatively, a molded body made of the open-pore material, for example a bonded fibrous material, may be arranged in the housing.

Methods and devices are provided that allow for easy replacement of a motor assembly in a fuel dispensing unit. In one embodiment, a protective end cap for use with a motor assembly is provided and includes a junction box housing having a sealed end that can couple to a motor, and an opposite open end that can couple to an end plate. The junction box housing can be configured to house a junction box that allows electrical wires extending through the end plate to couple to electrical wires extending from the motor through the sealed end of the junction box housing. A motor assembly having a junction box housing and methods for replacing a motor assembly in a fuel dispenser are also provided.