Abstract:
Die Erfindung betrifft einen Luftverdichter (10), beispielsweise zur Versorgung eines Druckluftsystems eines Kraftfahrzeugs mit Druckluft, aufweisend ein Kurbelgehäuse (46), ein mit dem Kurbelgehäuse verbundenes Zylindergehäuse (14), einen Zylinderkopf (20), eine in dem Kurbelgehäuse drehbar gelagert angeordnete Kurbelwelle (40), einen mittels eines Pleuels (42) mit der Kurbelwelle (40) verbundenen zylindrischen Kolben (12), welcher entlang einer zylindrischen Lauffläche (56) des Zylindergehäuses (14) axial bewegbar angeordnet ist, wenigstens einen Kolbenring (54) oder Ölabstreifring, welcher in einer ringförmigen Nut (52) an Außenmantelfläche des Kolbens (12) angeordnet ist, einen Verdichtungsraum (16), welcher oberhalb des Kolbens (12) ausgebildet ist und durch den Zylinderkopf (20) verschlossen ist, weiter aufweisend einen Ansaugkanal (26) und einen Auslasskanal (28), welche in einem Zylinderkopfoberteil (22) des Zylinderkopfes (20) ausgebildet sind, wobei dem Ansaugkanal (26) wenigstens ein Saugventil (36) sowie dem Auslasskanal (28) wenigstens ein Druckventil (38) zugeordnet ist, und bei dem das Kurbelgehäuse (46) sowie das Zylindergehäuse (14) unter Verwendung von Aluminium hergestellt sind. Um die zu komprimierende Luft möglichst wenig mit Wärme zu belasten ist vorgesehen, dass das Kurbelgehäuse (46), das Zylindergehäuse (14), der Zylinderkopf (20) und der Kolben (12) aus Aluminium oder einer Aluminium-Legierung hergestellt sind, und dass der wenigstens eine Kolbenring (54) oder der wenigstens eine Ölabstreifring aus Grauguss oder aus Polytetrafluorethylen (PTFE) hergestellt ist.
Abstract:
A nodular graphite cast iron, a method for fabricating a vane for a rotary compressor using nodular graphite cast iron, and a vane for a rotary compressor using the same are provided. The nodular graphite cast iron is comprised of 3.4 wt% to 3.9 wt% of carbon (C), 2.0 wt% to 3.0 wt% of silicon (Si), 0.3 wt% to 1.0 wt% of manganese (Mn), 0.1 wt% to 1.0 wt% of chromium (Cr), 0.04 wt% to 0.15 wt% of titanium (Ti), less than 0.08 w% of phosphorus (P), less than 0.025 wt% of sulphur (S), 0.03 wt% to 0.05 wt% of magnesium (Mg), 0.02 wt% to 0.04 wt% of rare earth resource, iron (Fe) and impurities as the remnants, and includes a bainite matrix structure, nodular graphite, and 15 vol% to 35 vol% of carbide.
Abstract:
A pump shaft (10, 12) and a pump member (16, 18) mountable on the shaft for rotation with the shaft have respective contact surfaces that contact when the pump member is mounted on the shaft. At least one of the contact surfaces is formed such that corrosion products of the surface are substantially incompatible with the other contact surface so that joining of the shaft and pump member at the contact surfaces by corrosion is substantially prevented. The pump shaft and pump member may be parts of a dry pump.
Abstract:
A multi stage vacuum pump for pumping corrosive fluid with a first flow path of less corrosion material than the material of a second flow path downstream of the first flow path.
Abstract:
A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus (10) includes an adjustment mechanism (88) capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members (14, 42) and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll (42) of two portions (44, 46), with a supporting portion (44) surrounding an eccentric bearing (34) of higher density than that of a scroll portion (46). The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes n orbital scroll (42) having two portions, a supporting portion (44) surrounding an eccentric bearing (34) having a lower coefficient of thermal expansion than that of scroll portion (46), to reduce thermal expansion of the supporting portion, reducing misalignment of the orbital scroll on the eccentric bearing.
Abstract:
A nodular graphite cast iron, a method for fabricating a vane for a rotary compressor using nodular graphite cast iron, and a vane for a rotary compressor using the same are provided. The nodular graphite cast iron includes 3.4 wt % to 3.9 wt % of carbon (C), 2.0 wt % to 3.0 wt % of silicon (Si), 0.3 wt % to 1.0 wt % of manganese (Mn), 0.1 wt % to 1.0 wt % of chromium (Cr), 0.04 wt % to 0.15 wt % of titanium (Ti), less than 0.08 w % of phosphorus (P), less than 0.025 wt % of sulphur (S), 0.03 wt % to 0.05 wt % of magnesium (Mg), 0.02 wt % to 0.04 wt % of rare earth resource, iron (Fe) and impurities as the remnants, and includes a bainite matrix structure, nodular graphite, and 15 vol % to 35 vol % of carbide.
Abstract:
A refrigerant compressor includes a first layer (24) composed of a single layer of chromium, a second layer (25) composed of an alloy layer of chromium and tungsten carbide, a third layer (26) composed of an amorphous carbon layer containing at least one of tungsten and tungsten carbide, and a fourth layer (27) composed of an amorphous carbon layer containing carbon and hydrogen without metals, which are sequentially formed on a surface of a sliding member (13b) of a compression mechanism formed of tool steel. The second layer (25) is formed to have a chromium content higher on a side of the first layer (24) than a side of the third layer (26), and have a tungsten carbide content higher on the side of the third layer (26) than the side of the first layer (24). In addition, the third layer (26) is formed to have a tungsten content or a tungsten carbide content higher on a side of the second layer (25) than a side of the fourth layer (27).
Abstract:
A scroll compressor includes a scroll member having a base and a generally spiral wrap that extends from the base to define a portion of a compression chamber. The scroll member is made of a cast iron material comprising a microstructure having graphite nodules.