Abstract: A fuel cell system includes a fuel cell module, auxiliary equipment, a power converter, and a casing containing the fuel cell module, the auxiliary equipment, and the power converter. The casing has a plurality of surfaces including one detachable maintenance surface. Only the maintenance surface has an air intake port for taking an oxygen-containing gas into the casing, an air exhaust port for discharging an exhaust gas discharged from the fuel cell module, to the outside of the casing, and a ventilation inlet port and a ventilation outlet port for ventilation of an inside of the casing by air.

Abstract: A fuel cell system includes a fuel cell module, auxiliary equipment, a power converter, and a casing containing the fuel cell module, the auxiliary equipment, and the power converter. The casing has a plurality of surfaces including one detachable maintenance surface. Only the maintenance surface has an air intake port for taking an oxygen-containing gas into the casing, an air exhaust port for discharging an exhaust gas discharged from the fuel cell module, to the outside of the casing, and a ventilation inlet port and a ventilation outlet port for ventilation of an inside of the casing by air.

Abstract: A cogeneration apparatus includes: an airtight chamber provided within an apparatus casing and constructed to prevent exhaust gas of a prime mover from flowing out therefrom; and a relief valve provided in a water flow path within the airtight chamber and constructed to discharge the exhaust gas, contained in the water flow path, to the airtight chamber.

Abstract: An air cleaner device whereby the number of component parts is reduced and the filter element can be maintained and inspected without a time-consuming procedure. The air cleaner device includes: a support part provided to a cleaner case and having a fitting ingress at a region on the opposite side thereof from the cover; and a pivot provided to the cover and having a convex part capable of fitting in the fitting ingress of the support part. A hinge part for connecting the cover to the cleaner case so that the cover can open and close is formed by the support part and the pivot by fitting of the convex part in the fitting ingress.

Abstract: A heat exchange tube is constructed by forming, on a cylindrical tube peripheral wall, a plurality of projecting portions which project to an inside of the tube peripheral wall, and which are formed by pushing. The plurality of projecting portions are formed, respectively, into conical shapes across a tube axis, and are arranged along virtual spirals on the tube peripheral wall. Accordingly, it is possible to provide a heat exchange tube which facilitates formation of a plurality of projecting portions with the thickness hardly changed and without formation of protruded portions, and which is capable of contributing to enhancement of heat exchanging efficiency.

Abstract: A cogeneration apparatus includes: an airtight chamber provided within an apparatus casing and constructed to prevent exhaust gas of a prime mover from flowing out therefrom; and a relief valve provided in a water flow path within the airtight chamber and constructed to discharge the exhaust gas, contained in the water flow path, to the airtight chamber.

Abstract: An air cleaner device whereby the number of component parts is reduced and the filter element can be maintained and inspected without a time-consuming procedure. The air cleaner device includes: a support part provided to a cleaner case and having a fitting ingress at a region on the opposite side thereof from the cover; and a pivot provided to the cover and having a convex part capable of fitting in the fitting ingress of the support part. A hinge part for connecting the cover to the cleaner case so that the cover can open and close is formed by the support part and the pivot by fitting of the convex part in the fitting ingress.

Abstract: A heat exchange tube is constructed by forming, on a cylindrical tube peripheral wall, a plurality of projecting portions which project to an inside of the tube peripheral wall, and which are formed by pushing. The plurality of projecting portions are formed, respectively, into conical shapes across a tube axis, and are arranged along virtual spirals on the tube peripheral wall. Accordingly, it is possible to provide a heat exchange tube which facilitates formation of a plurality of projecting portions with the thickness hardly changed and without formation of protruded portions, and which is capable of contributing to enhancement of heat exchanging efficiency.

Abstract: A water-cooled vertical engine is provided with an exhaust guide cooling water jacket and an exhaust manifold cooling water jacket formed in an engine compartment exhaust passage, a cylinder block cooling water jacket formed in a cylinder block, and a cylinder head cooling water jacket formed in a cylinder head. A first cooling path for supplying cooling water from a cooling water pump to the cylinder block cooling water jacket via the exhaust guide cooling water jacket and the exhaust manifold cooling water jacket is substantially independent from a second cooling path for supplying cooling water from the cooling water pump to the cylinder head cooling water jacket. Thermostats are provided in the cylinder block cooling water jacket and the cylinder head cooling water jacket, respectively.

Abstract: A water-cooled vertical engine includes: an exhaust guide cooling water jacket and an exhaust manifold cooling water jacket which are formed in an engine compartment; a cylinder block cooling water jacket formed in a cylinder block; and a cylinder head cooling water jacket formed in a cylinder head. Cooling water from a cooling water pump is supplied in parallel to an upper part and a lower part of the cylinder block cooling water jacket through the exhaust guide cooling water jacket and the exhaust manifold cooling water jacket.

Abstract: A water-cooled vertical engine is provided with an exhaust guide cooling water jacket and an exhaust manifold cooling water jacket formed in an engine compartment exhaust passage, a cylinder block cooling water jacket formed in a cylinder block, and a cylinder head cooling water jacket formed in a cylinder head. A first cooling path for supplying cooling water from a cooling water pump to the cylinder block cooling water jacket via the exhaust guide cooling water jacket and the exhaust manifold cooling water jacket is substantially independent from a second cooling path for supplying cooling water from the cooling water pump to the cylinder head cooling water jacket. Thermostats are provided in the cylinder block cooling water jacket and the cylinder head cooling water jacket, respectively.

Abstract: A water-cooled vertical engine includes: an exhaust guide cooling water jacket and an exhaust manifold cooling water jacket which are formed in an engine compartment; a cylinder block cooling water jacket formed in a cylinder block; and a cylinder head cooling water jacket formed in a cylinder head. Cooling water from a cooling water pump is supplied in parallel to an upper part and a lower part of the cylinder block cooling water jacket through the exhaust guide cooling water jacket and the exhaust manifold cooling water jacket.