摘要:
Engine parts having high durability, which can be used at high operating temperatures, comprise components (23) consisting mainly of partially stabilized zirconia having high strength in which the thermal expansion hysteresis (difference of thermal expansion at an optional temperature in the thermal expansion during heating up and the thermal shrinkage during cooling down) is less than 0.4% and the thermal expansion coefficient is more than 10 x 10 -6 /°C. Preferred such engine parts consist of a ceramic-metal composite body wherein the partially stabilized zirconia and a metal (22) are bonded and wherein the difference between the thermal expansion coefficients of the ceramic and the metal is less than 3 x 10 6 /°C.
摘要:
Scroll compressor designs are provided to minimize vibration, sound, and noise transmission. The scroll compressor has a bearing housing, and orbiting and non-orbiting scroll members. The non-orbiting scroll member has a radially extending flanged portion with at least one aperture substantially aligned with the axially extending bore. At least one fastener is disposed within the aperture and the bore. A sound isolation member contacts at least one of the non-orbiting scroll member, the fastener, or the bearing housing, to reduce or eliminate noise transmission. The sound isolation member may be formed of a polymeric composite having an acoustic impedance value greater than the surrounding materials. The sound isolation member may be an annular washer, an O-ring, or a biasing member, by way of non-limiting example. In other variations, fluid passages are provided within the fastener and/or bearing housing to facilitate entry of lubricant oil to further dampen sound and noise.
摘要:
A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.
摘要:
Es wird ein Aktor zur Umwandlung von thermischer in kinetische Energie bereitgestellt, umfassend einen Arbeitszylinder (1) mit einem Gehäuse (3) mit einem Einlass (5) und einem Auslass (7) für ein Arbeitsfluid, mindestens einem Dehnstoffelement (15), das eine Umhüllung, einen Dehnstoff und eine Kolbenstange (17) aufweist, wobei das Dehnstoffelement (15) zumindest teilweise von dem Arbeitsfluid (14) umgeben ist, und einem Arbeitskolben (19), der axial aus dem Arbeitszylinder (1) heraus und in denselben hinein bewegbar ist, eine erste Arbeitsfluidquelle, die dazu eingerichtet ist, Arbeitsfluid (14) einer ersten Temperatur bereit zu stellen, eine zweite Arbeitsfluidquelle, die dazu eingerichtet ist, Arbeitsfluid (14) einer um eine vorbestimmte Temperaturdifferenz niedrigeren zweiten Temperatur bereit zu stellen, eine Vorlaufleitung (9), die an ihrem einen Ende mit der ersten oder der zweiten Arbeitsfluidquelle verbindbar und an ihrem anderen Ende mit dem Arbeitszylinder (1) verbunden ist, eine Rücklaufleitung (11), die an ihrem einen Ende mit dem Arbeitszylinder (1) und an ihrem anderen Ende mit einer Arbeitsfluidsenke verbunden ist, eine Steuerungseinrichtung, die dazu eingerichtet ist, den Fluidfluss aus der ersten oder der zweiten Arbeitsfluidquelle in den und aus dem Arbeitszylinder (1) zu steuern, wobei sich durch abwechselndes Zuführen von Arbeitsfluid (14) aus der ersten oder der zweiten Arbeitsfluidquelle in den Arbeitszylinder (1) das mindestens eine Dehnstoffelement (15) von dem Arbeitsfluid (14) umgeben wird und dadurch eine Hin- und Herbewegung des Arbeitskolbens (19) bewirkt wird.
摘要:
A tapered roller bearing (31a) has a plurality of retainer segments (11a, 11d) each having a pocket to house a tapered roller (34a), and arranged so as to be continuously lined with each other in a circumferential direction between an outer ring (32a) and an inner ring (33a). The retainer segment (11a, 11d) is formed of a resin containing a filler material to lower a thermal linear expansion coefficient. In addition, a clearance (39a) is provided between the first retainer segment (11a) and the last retainer segment (11d) after the plurality of retainer segments (11a, 11d) have been arranged in the circumferential direction without providing any clearance. Here a circumferential range (R) of the clearance (39a) is larger than 0.075% of a circumference of a circle passing through a center of the retainer segment (11a, 11d) and smaller than 0.12% thereof at room temperature.
摘要:
The invention relates to a thermohydraulic pressure increase method and to the application thereof. Such a technical solution is required primarily in the field of energy management, in mechanical engineering, and in chemical plant engineering. In a hydraulic system, according to the prior art a hydraulic pump, which is driven by a motor disadvantageously requiring premiums forms of energy, such as electricity, diesel, or gasoline, is used to achieve the pressure increase. Some working fluids very drastically change the density thereof close to and above the critical point as the temperature rises, and transition into the gaseous state and under high pressure multiply the volume thereof if additional energy is supplied without density leaps at temperatures far below 100ºC. If the substance-specific system pressure and the system temperature can be adjusted to a hydraulic process, the waste heat can be used for volume change work. The aim is to achieve volume change work by way of waste heat in a thermal process and apply said work to a hydraulic process, for example, in order to then drive presses or generators in stationary industrial systems.
摘要:
An actuator assembly (26) includes an operating actuator and a holding actuator (365) that are engageable with an operator member of a device. The operating actuation is cycled between on and off states to move the operator member in incremental steps, and the holding is maintained in an active state to maintain or latch the current position of the operator member. Each of the operating and holding actuators may include one of the following: a solenoid actuator (361); and an actuator including one or more expandable elements, such as a piezoelectric element, a magnetostrictive element, and a heat-expandable element (602).
摘要:
A multistage dry pump includes a pump housing having plural pump chambers aligned in parallel, a rotational shaft extending along a parallel alignment direction of the plural pump chambers and rotatably supported by the pump housing, and plural rotors parallelly aligned in an axial direction of the rotational shaft and furnished in the respective plural pump chambers. The rotational shaft is formed with a base material of which linear expansion coefficient is less than 6 × 10 -6 m / m · K inclusive, and the respective plural rotors is made of a material which is more easily machined than the material of the rotational shaft.
摘要翻译:多级干式泵包括:泵壳体,其具有平行排列的多个泵室,沿着多个泵室的平行排列方向延伸并由泵壳体可旋转地支撑的旋转轴,以及沿旋转轴线方向平行排列的多个转子 并配置在相应的多个泵室中。 旋转轴形成有线膨胀系数小于6×10 -6 m / m·K的基材,并且各个转子由比旋转材料更容易加工的材料制成 轴。