Abstract: A primary-secondary pumping system for HVAC systems wherein the common pipe is configured so that there is at least a 4 ft pressure drop across the length of the common pipe and that all thermal plants see the same temperature of water entering the thermal plants and that return water sees the pressure drop of the common pipe before it sees the chilled (or heated) water leaving the thermal plant and the suction of the secondary pumps.

Abstract: Disclosed herein are a cylinder assembly for compressors, a compressor with the cylinder assembly, and an apparatus having a refrigerant circulation circuit with the compressor. The present invention provides the cylinder assembly, which has a simple structure and is designed to further reduce a pulse noise. The cylinder assembly includes a cylinder block having two exhaust mufflers. Each of the exhaust mufflers is opened at an end thereof. A frame is mounted to the cylinder block to cover the open ends of the exhaust mufflers. At least one channel is formed at a junction between the cylinder block and the frame to allow a refrigerant to flow between the exhaust mufflers. Further, the cylinder assembly of the present invention is applied to a compressor, and the compressor of the present invention is applied to an apparatus having a refrigerant circulation circuit.

Abstract: The axial piston machine comprises a case, a shaft and a cylinder block (2), arranged so as to rotate in the case and having a plurality of cylinders (21) with pistons, adapted to slide in said cylinders and connected to piston rods (6) by means of first spherical joints, the piston rods being connected to a sliding plate (7) by means of second spherical joints (63), said sliding plate (7) being supported by a swash plate (8) via a bearing (72). For the connection between a piston rod (6) and the sliding plate (7), the machine further comprises a first driving rotational surface (61) linked to the piston rod (6) and a corresponding second driving rotational surface (71) linked to the sliding plate (7), a clearance being left between said first driving rotational surface (61) and said second driving rotational surface (71) and said surfaces being adjacent.

Abstract: A method and apparatus for analyzing a hydraulic pump in real-time. A pressure signal is provided representing a discharge pressure of the hydraulic pump, and the pressure signal is decomposed into a plurality of levels. Each of the plurality of levels has at least one frequency band. A feature pressure signal is located in at least one of the frequency bands and compared to a reference wavelet to determine if a fault exists in the hydraulic pump and/or a type of defect in the hydraulic pump.

Abstract: The electrically motorized pump has a low energy loss because it uses of the shaft and the sleeve made from synthetic resin composition obtained by uniformly dispersing fine powder of RBC or CRBC in a resin. The typical process for the production of a synthetic resin composition for making the sleeve bearing for the pump for use in water includes kneading with a resin the fine powder of RBC or CRBC at a temperature in the neighborhood of the melting point of the resin, and thereby uniformly dispersing the fine powder of RBC or CRBC in the resin. Fibers, such as glass fibers, may be blended with the fine powder of RBC or CRBC and the resin.

Abstract: A piston pump for brake systems the region of the outlet valve is provided with a pressure chamber, an opposing chamber, and a flexible wall that divides the pressure chamber from the opposing chamber. The flexible wall has an elastically resilient diaphragm that is supported in an elastically flexible body.

Abstract: A rod body (30) is formed of magnetostrictive material and includes one end portion (30a) fixed, and a piston (35) is fixed to the other end portion (30b) of the rod body (30). The piston (35) is slidably disposed within a cylinder (36) in which there is formed a pump chamber (37). A suction port (39) for sucking lubricating oil into the pump chamber (37) is formed in the cylinder (36), while a suction valve (40) for preventing the lubricating oil from flowing out from the suction port (39) is disposed in the suction port (39). In the cylinder (36), there is disposed a nozzle (20) which communicates with the pump chamber (37) and has a sectional area smaller than the lubricating oil passage sectional area of the suction valve (40). There is disposed a coil (43) outside the rod body (30) and, to the coil (43), there is connected a control device (6) for controlling the supply of a current to be supplied to the coil (43).

Abstract: An improved motor-driven pump is provided for delivering a flow of water in a swimming pool or spa environment or the like. The improved pump includes a motor mounted within a motor housing having a seal plate mounted at one end thereof. The seal plate carries a shaft bearing for rotatably supporting a drive shaft having an outboard end connected to an impeller disposed within a pump chamber defined cooperatively by the seal plate and a volute housing mounted thereon. A primary seal assembly includes an axially spring-loaded dynamic seal ring carried on the drive shaft for rotation therewith and for running engagement with a stationary bushing carried by the seal plate. A secondary seal assembly is positioned axially between the primary seal assembly and motor bearing, and includes at least one slinger disk for radially outwardly slinging any water leaking past the primary seal assembly through a vent chamber.

Abstract: A pump leak monitor for use with a peristaltic pump comprises a pump housing and a pair of electrical contacts disposed along a bottom end of the pump housing. The electrical contacts are located such that the contacts are immersed in fluid when the pump is leaking. The fluid conducts electricity across the contacts and thereby closes an electrical circuit for providing an indication that a leak has been detected. By measuring an electrical parameter in the circuit, the pump leak monitor is capable of measuring the conductivity of the fluid in the pump housing. As a result, the pump leak monitor is capable of differentiating between different types of fluid.

Abstract: A drive system for driving a mixer impeller shaft in a vessel, including a motor; an outer magnet rotor driven by the motor; a bearing housing mountable to a vessel; and a drive shaft rotatable in the bearing housing. An inner magnet rotor is connected to the drive shaft and a manifold plate is connected to the bearing housing. A canister is connected to the manifold plate so that a chamber is defined in the bearing housing having an inlet port for directing fluids into the chamber. A plurality of ports extend through the manifold plate providing fluid communication from the chamber to the inside of the canister; and a plurality of ports through the inner magnet rotor provide fluid communication from the inside of the canister through the inner magnet rotor. A fluid path is provided from the chamber through the ports, around the inner magnet motor, and through the inner magnet rotor, which fluid path is sealed from the environment by the canister.

Abstract: A jet-propelled rotary engine comprises a stator and a rotor operatively coupled to the stator for rotation of the rotor relative to the stator about a rotor axis. The rotor comprises at least first and second jet assemblies wherein the first jet assembly defines a first converging flow region, a first diverging flow region downstream of the first converging flow region, and a first discharge port and wherein the second jet assembly defines a second converging flow region, a second diverging flow region downstream of the second converging flow region, and a second discharge port. The rotary engine further comprises a combustion region having an upstream portion and is adapted to cause a combustion reaction of an oxygen-fuel mixture in the combustion region in a manner to form combustion reaction products which comprise at least a part of thrust matter to be discharged through the discharge ports of the first and second jet assemblies.

Abstract: A two-stage compressor for generating necessary pressure differential for air-conditioning applications with air-cooled, water-cooled and evaporative-cooled condensing systems using low-pressure refrigerant, such as R134a, is provided. A rotating assembly is mounted for rotation in a compressor housing and includes a shaft, a thrust bearing disk associated with the shaft to maintain an axial position of the rotating assembly, a motor rotor mounted on the shaft, and first and second impellers mounted for rotation with the shaft. First and second journal bearings are mounted in the compressor housing to support the shaft and maintain radial positioning of the rotating assembly. Volute housings including a spiral-shaped volute are associated with each of the impellers to collect and further discharge gas compressed by the impellers. Diffusers having air-foil shaped vanes are locate in the volute channels adjacent the discharge outlets of the impellers to aide in the discharge of gas from the impellers.

Abstract: In an electric compressor, in which an electric motor and a compressor driven thereby are integrated, in order to prevent a reduction in the durability of the electric motor and the like due to heat conducted from heat radiating bodies such as drive circuits, a fluid, prior to being taken into the compressor portion, is circulated through the electric motor portion as a medium for cooling. In this case, a plurality of cooling medium passages for example are provided parallel to the axis of rotation, and the endothermic capacity of passages formed in the vicinity of heat radiating bodies is made greater than the endothermic capacity of passages formed in other portions.

Abstract: The invention relates to a hydraulic system (1) comprising a main pump (12) and a precompression pump (5), whereby the outlet (8) of the precompression pump (5) is connected by a connecting line (9) to the inlet (11) of the main pump (12). The outlet (16) of the main pump (12) can be connected by a working line (17) to a consumer (A, B). The volume flow at the inlet (11) of the main pump (12) is changeable. The aim of the invention is to achieve greater efficiency. The precompression pump (5) comprises an adjusting device (6) for adjusting the flow rate.

Abstract: The invention relates to a rocket engine nozzle comprising a system for controlling jet separation of the flow in the nozzle, wherein said control system exhibits a plurality of separation triggering elements (5, 10) arranged in such a way as to generate, from mutually spaced initiation points (9), distinct zones (6) of jet separation, so as to form a three-dimensional separation of the flow. The flow control system can exhibit at least two triggering elements (5, 10).

Abstract: The present invention provides a process and a device for transport of gas in a main duct with more than two branch ducts wherein the gas is guided through the branch ducts (1, 2, 3, 4, 5, 6, 7, 8) and into the main duct (A) with a direction which is parallel to the direction of the flow in the main duct, while the gas in the branch duct at the inlet to the main duct is kept at a higher velocity than the gas in the main duct and the gas in the main duct is given an impulse, by utilisation of excess energy from the gas in the branch duct, for acceleration of the gas prior to introduction into the main duct.

Abstract: A high-speed fluidic device has a friction roller type speed-increasing mechanism, an electric motor, and a high-speed fluidic machine, wherein: the friction roller type speed-increasing mechanism includes a housing, a low-speed side member having an outer ring provided at one end portion thereof, a high-speed side shaft rotatably supported by the housing so as to be eccentric to the low-speed side member and the outer ring, at least one guide roller rotatably supported between the outer ring and the high-speed side shaft, and at least one movable roller rotatably supported between the outer ring and the high-speed side shaft; the electric motor drives the friction roller type speed-increasing mechanism; and the high-speed fluidic machine is connected to the high-speed side shaft so as to be driven by the high-speed side shaft.

Abstract: A vibration type compressor related to the present invention, in which a compressor main body 3 is built into a gastight vessel 2 including a yoke 7-1, a magnetic path member 7 formed from a column-shaped core pole 7-2, a permanent magnet 12 arranged in the magnetic path, an electromagnetic coil 14 which is arranged within an annular magnetic gap 13 between the magnetic path members 7 by being supported by a mechanical vibration system to as to be able to vibrate and is wound around a lead plate to perform the connection treatment of a terminal thereof, a piston 16 connected to the electromagnetic coil 14, and a cylinder block 8 which closes the yoke 7-1 and in the interior of which is formed the cylinder portion 17 housing the piston 16, characterized in that the permanent magnet 12 is formed from a neodymium magnet or a rare-earth magnet and in that the cylindrical permanent magnet 12 is divided into four parts in the axial direction thereof, the four-part divided magnet being bonded and fixed to the side o

Abstract: A vacuum pump apparatus has a casing and a base connected to the casing. The base has an opening communicating with an interior space of the casing. A heater is mounted on the base for heating the base to maintain a gas discharge path at a temperature high enough to prevent solidification of processed gas in the vacuum pump. A cover member covers the opening of the base. The cover member has a first surface communicating with the interior space of the casing and a second surface exposed to the exterior of the vacuum pump. A substrate is connected to the first surface of the cover member and has at least one circuit for controlling operation of the vacuum pump.

Abstract: Provided is an engine having positive displacement chambers containing pistons and an external combustion chamber which utilizes the compression energy in compressed natural gas from a high pressure main line and compressed air in combination with the energy released during combustion of the fuel to drive the pistons. Energy expended compressing the natural gas and air are recovered. Also provided is an electrical generator driven by the engine.