Abstract: A device for generating a vacuum comprises a liquid-ring vacuum pump driven by an electric motor and operating with a working fluid. A mixture of compressed air and working fluid from the pump flows to a preseparator which separates a major portion of the working fluid from the gaseous mixture. The separated working fluid is fed from a reservoir in the preseparator via a liquid cooling coil back to the liquid-ring vacuum pump, while the gas still loaded with a residue of the working fluid is fed to a fine separator by means of a gas cooler, working fluid separated in the fine separator being returned to the pump via a return line. The preseparator and the fine separator are physically spaced from one another. The gas cooler and the liquid cooling coil are also physically spaced from one another and are located in the path of the cooling air stream for the electric motor.

Abstract: A closed loop control is provided to control pressure and/or temperature in a system where one or more liquid ring vacuum pumps evacuate a recipient. The suction ability of the liquid ring vacuum pumps is controlled either by speed control, operating water temperature, switching-on and -off of pumps or bypass-air. Simultaneous control of all operating characteristics is achieved with a programmable electronic controller.

Abstract: A water ring vacuum pump having a body with end members, an impeller in the body and having a shaft which extends through the end members and being journalled for rotation therein. One end member has an inlet and the other an outlet. A port plate is located in each member and adjacent the ends of the blades of the impeller whereby a manifold is formed between each port plate and its adjacent end chamber. The port plates are moveable relative to their adjacent end members by screws or the like passing through the end member, which screws abut the face of the port plate and can act to vary its location relative to the impeller and locking bolts passing through the end member and into threads in the port plate whereby the port plate can be moved away from the impeller. The locking bolts, when the impeller is correctly positioned, acts against the screws or the like which abut the port plate, thus serving to lock the port plate in position.

Abstract: In a liquid ring compressor, the erosion and cavitation damage occurring under certain operating conditions is avoided by adding air or gas from the outside, at a pressure which approximately corresponds to the compression pressure, into particular pressure slot areas.

Abstract: A fluid pump having an outer cylindrical housing (10) rotating relative to an inner hub (44) from which radially projects a probe (52) apertured in its external surface to be exposed to the flow therepast of an annulus of operational liquid (14) constrained in a circular path of motion by the rotating housing, the probe having an internal passage for communicating the aperture with a first external space and the inner liquid-free space in the housing having an outlet for communicating with a second external space. In use, fluid to be pumped is sucked out of the apertured probe to emerge as fluid bubbles which migrate through the rotating liquid annulus to the liquid-free center, then to pass to the outlet.

Abstract: A double-lobe liquid ring gas compressor includes a port member having two circumferentially spaced intake ports and two circumferentially spaced discharge ports. The intake ports are axially offset from the discharge ports. The intake ports are connected to a common intake passage in the port member, and the discharge ports are similarly connected to a common discharge passage in the port member. These passages respectively communicate with intake and discharge manifolds in a head member which can be identical to the head member of a single-lobe liquid ring vacuum pump.

Abstract: The invention discloses a rotary gas compressor for liquids which includes an impeller housing, an impeller rotatably mounted in the housing, a housing cover, a control disc arranged between the housing and the cover, and a suction intake and pressure outlet provided on the housing cover. Within the housing cover suction and pressure chambers are defined by a separating web arranged between the cover and the control disc. Into the suction chamber opens the suction intake provided on the housing cover; a suction slot provided in the control disc then provides communication with the impeller. The pressure outlet connection communicates with the pressure chamber, and a pressure slot provided in the control disc then also communicates with the impeller. One or more additional pressure apertures are arranged in the control disc adjacent to the pressure slot, and resilient valve tongues cover all of the additional apertures, except for one aperture to which a pressure pipe is connected.

Abstract: The invention discloses a rotary gas compressor for liquids which includes an impeller housing, an impeller rotatably mounted in the housing, a housing cover, a control disc arranged between the housing and the cover, and a suction intake and pressure outlet provided on the housing cover. Within the housing cover suction and pressure chambers are defined by a separating web arranged between the cover and the control disc. Into the suction chamber opens the suction intake provided on the housing cover; a suction slot provided in the control disc then provides communication with the impeller. The pressure outlet connection communicates with the pressure chamber, and a pressure slot provided in the control disc then also communicates with the impeller. One or more additional pressure aperatures are arranged in the control disc adjacent to the pressure slot, and resilient valve tongues cover all of the additional pressure apertures, except for one aperture to which a pressure relief pipe is connected.

Abstract: In liquid ring pumps having conical port members, cavitation and associated operating noise are reduced by providing a second subsidiary discharge port beyond the closing edge of the main discharge port in the direction of rotor rotation.

Abstract: For improved operation of a liquid ring vacuum pump at lower suction pressures and avoiding erosion damage while eliminating pressure booster pumps or scooping tubes in circular operation as well as for simplified external control of the working liquid, an inflow channel is milled into the control disc behind the suction slot on the side facing the impeller, which channel is in communication with a pressurized liquid passage for gap sealing pressurized liquid. The pressurized liquid feed line is connected to a separator or to the machine sump. For improving the efficiency or the liquid output at higher suction pressures, a relief passage is also provided in the control disc above the pressure slot.

Abstract: A liquid ring pump including a helically bladed rotor 2 eccentrically mounted in an elongated pump casing 1 and including a hub 3, a suction inlet 18 and a discharge outlet 19 at respective ends of the pump casing 1. The open space between the bladings ends at the inlet are closed by a preferably circular plate 26 and access to the space between the buildings is given only through one or more openings 27 in the plate 26. This results in a minimizing of the power loss.Paddles 28 could be attached to the plate 26 and there could be a plate 31 at the discharge end as well. Further the holes 27 could be arranged in the hub 3, and the end of the rotor at the inlet end could be located in a cavity 32 in the end wall 10.

Abstract: In a liquid-ring rotary compressor, a control disc has, ahead of a sickle-shaped pressure or outlet slot, a multiplicity of spaced radial slots with width and shape conforming to the width and profile of the impeller blades. One such disc is usable for different pressure ratios without requiring a change in the relative position of the compressor housing.

Abstract: In liquid ring pumps having conical port members, cavitation and associated operating noise are reduced by providing a second subsidiary discharge port beyond the closing edge of the main discharge port in the direction of rotor rotation.

Abstract: A liquid ring pump with a conical or cylindrical port member has a vent-recirculation port in the port member in addition to the conventional intake and discharge ports. The vent-recirculation port communicates with the compression zone of the pump and is connected to a reservoir of pumping liquid maintained in the discharge portion of the pump head. When the pump is operating at relatively low compression ratios, the vent-recirculation port acts as a vent to prevent overcompression of the gas in the pump. At relatively high compression ratios, the vent-recirculation port recirculates pumping liquid from the reservoir, thereby increasing the maximum attainable compression ratio.

Abstract: A liquid ring pump having a control disk interposed between the impeller housing and a cover provided with connecting stubs is disclosed. A seal is interposed between the cover and the control disk and pressed against the control disk by a supporting edge of the cover. The seal further has a central web separating the pressure and the suction spaces formed in the cover. The interior of the impeller housing is sealed from the exterior thereof at the edge resting against the control disk. Sealing at two spaced locations, i.e. at the edge of the housing and between the cover and the control disk, is accomplished with a one-piece seal in accordance with the invention by providing a cup-shaped seal which has at the free end of its circumferential wall a radially outward-extending bead which is pressed against the rim of the impeller housing by an edge of the cover which axially extends beyond the circumferential wall.

Abstract: A liquid ring pump having at least one vane disposed in the portion of the liquid ring between the outer periphery of the rotor and the inner periphery of the housing for controlling the flow of the adjacent liquid to reduce energy losses due to such factors as the curvature of the liquid flow and re-entry of the liquid into the rotor with velocity which does not match the velocity of the liquid already in the rotor.

Abstract: A liquid ring pump having at least two discharge port portions communicating respectively with relatively low and relatively high pressure portions of the compression zone in the pump, and a discharge chamber communicating with the discharge port portions for causing excess pumping liquid discharged from the discharge port to flow transversely over the discharge port portion communicating with the relatively low pressure portion of the compression zone.

Abstract: An injector for a material transport system includes a helical inducer having a housing with a fluid input port, a material input port and a discharge port, each port is open to an internal chamber of the housing. A rotor with a helical blade is mounted to the housing and constrained for rotation within the chamber. A fluid entering the fluid input port is formed into a fluid vortex having a ventilated core by the rotating rotor blade. A feeder assembly feeds the material to be transported into the material input port where it is carried by the fluid vortex to the discharge port for transmission to a hydraulic transport line.

Abstract: The disclosure relates to a rotary compressor for a gas and liquid mixture and comprising a disk-like rotor disposed in a fixed pump housing and having an annular peripheral gas and liquid channel. The channel includes an annular radially outer space for an entrapped liquid annulus and a radially inner, concentric annular space for gas, which is defined by a liquid trap-forming side wall which penetrates into the liquid annulus space. The gas space is divided into suction and compression chambers by one or more transverse walls connected to the rotor and radially from inwards penetrating into the liquid annulus space, and by planar liquid jets which are deflected from the rotating liquid annulus in the space therefor by means of one or more blades which are fixedly anchored in the pump housing and extend radially along the liquid annulus space.

Abstract: A rotary gas compressor has a hollow housing, inner and outer rotors arranged in the housing and provided with a liquid ring therebetween so that rotation of the inner rotor causes rotation of the outer rotor, and the inner rotor is provided with two helical blades guiding gas from the ends to the center of the inner rotor, a speed-varying device having a member which freely rotates over the outer rotor and includes an acceleration tube arranged to receive an incoming fluid and to introduce the same into the liquid ring, and a deceleration tube arranged to receive the fluid outgoing from the liquid ring and to pass the same into the interior of the housing, a filter element separating drops contained in the fluid within the interior of the inner rotor, and an oscillating tube for loading and unloading the compressor by varying the position of the liquid ring.

Abstract: In a system for evacuating fluids having vapor and gaseous phases, including a liquid ring pump, the seal liquid for which is provided in a closed system and is cooled by a heat exchanger through cooling liquid fed to the heat exhanger from outside the system, means are provided for diverting the seal liquid through a chiller when the temperature of the cooling liquid approaches the temperature of the gas/liquid mixture entering the pump. The chiller maintains the seal liquid temperature below the temperature of the cooling liquid in the heat exchanger and the cooling liquid is used in the chiller to receive the heat rejected from the seal liquid.

Abstract: In a two-stage liquid ring pump, gas leakage from the high pressure to the low pressure side of at least the first stage is substantially reduced and gas leakage from the second stage to the first stage is substantially reduced or eliminated by providing an annular seal member in the clearance between the first stage port plate adjacent the second stage and the adjacent end of the first stage rotor hub and supplying sealing liquid under pressure at least equal to the pump discharge pressure to substantially fill the portion of the clearance bounded by the annular seal member.

Abstract: Discharge or unloading orifices are provided in both stages of the two stage pump to bleed seal liquid under various vacuum conditions and to render the pump immune to the effects of variation in rotor speed and in the delivery rate of seal liquid.

Abstract: A normally liquid hydrocarbon having a minimum boiling point of about 425.degree. F. is utilized to provide the liquid seal in a vacuum pump which intakes a gaseous light ends stream resulting from a process for the production of ethyl acrylate by the reaction of ethylene with acrylic acid in the presence of a sulfuric acid catalyst. Upon contact in the vacuum pump, the gaseous light ends are partially absorbed into the normally liquid hydrocarbon, with the normally liquid hydrocarbon being recovered by fractionation.

Abstract: An improved liquid ring pump includes an impeller having a prime number of radial blades, preferably thirteen, which reduce pump noise and vibration by eliminating subharmonics due to blade pairing.

Abstract: A process for the compression of steam, particularly very low pressure saturated steam; and thermal circuits for its implementation.For the compression of the steam there is used at least one liquid ring compressor using water as compression agent.Principal applications: drying enclosures and circuits for obtaining compressed saturated steam.

Abstract: In a liquid ring compressor or vacuum pump with a liquid cooled electric motor and in a liquid separator disposed in housings which are connected to each other without piping and are subdivided into chambers by partitions, the compressor or pump housing forms, together with the motor housing, a first housing block and, in a second housing block, which is connected to the first via internal canals, a heat exchanger and the liquid separator are arranged with the two prismatic housing blocks immediately adjacent and sealed to each other on one side. The inlets and outlets for the liquid to be pumped and the cooling liquid are distributed over both housing blocks to provide a closed circuit for the operating liquid and for a continuous external supply of cooling liquid.

Abstract: A piece of machinery which, in an abnormal operating condition exhibits a vibration frequency characteristic of or peculiar to that condition, is monitored by securing a spring and mass unit to the machinery, the spring and mass unit having a natural frequency equal to said vibration frequency so that upon the occurence of the abnormal condition the magnified vibration of the spring and mass unit can be used to effect a control function or sound an alarm.

Abstract: An improved water ring rotary air compressor in which the rotor assembly has a cylindrical bore while the port head includes a cylindrical port sleeve, made from a high lubricity thermoplastic material, which fits within the bore. The use of a high lubricity thermoplastic port sleeve eliminates the need for shimming the port head following an overhaul of the compressor. The port sleeve includes a plurality of longitudinal slots which eliminate cavitation during start up under pressure. A needle valve built into the manifold allows bypass of a portion of the discharge air into the air inlet. Adjustment of the needle valve permits the maintenance of constant air flow as the compressor becomes worn.

Abstract: A liquid ring vacuum pump or compressor in which the port members open to the buckets of the rotor intermediate to the ends of the rotor so that the ratio of the axial length of the pump to the diameter can be relatively high.

Abstract: An improved liquid ring pump includes an impeller having a larger axial length to diameter ratio than found in the prior art, with suction ports at both ends of the impeller. The number of impeller blades is chosen to be a prime number, preferably thirteen, to reduce pump noise and vibration. The pump housing includes novel manifolding for parallel or compound pump arrangements having two impellers, with suction ports at both ends of at least one impeller. A unique joint configuration between housing sections is also disclosed.

Abstract: An engine driven by an expanding gas and utilizing a liquid seal in an inexpensive construction which by virtue of the low temperature differential required between inlet and outlet gas is particularly well adapted for use in converting collected solar energy to mechanical or electrical energy. The engine may also be adapted for use as a compressor.

Abstract: A novel method for compressing mixed gas consisting of combustible gas and air without risk of explosion of the mixed gas is described herein. In the novel method, the mixed gas is compressed under coexistence of non-combustible liquid such as water. In one preferred embodiment, a water-sealed compressor as represented by a Nash pump is used for compressing the mixed gas, and water contained in the compressed mixed gas is separated and fed back to the water-sealed compressor to assure existence of sealing water in the compressor.

Abstract: A motor-driven liquid-ring pump in which the pump and the motor are disposed in tandem and are coupled to each other by means of a coupling and/or a transmission and including a liquid separator coupled to the pump. The improvement of the invention comprises the separator being disposed between the motor and the pump and at least partially enclosing the coupling and/or the transmission.

Abstract: A liquid ring compressor including a separate gas input opening disposed in the control disc of the compressor near the delivery space of the compressor impeller between the suction and the output openings of the control disc. The improvement of the invention comprises the gas input opening comprising a calibrated gas input opening, and the compressor including means for coupling the opening to the compression space of the liquid ring compressor for continuously feeding a pressure-increasing gas ballast to the delivery space of the compressor through the calibrated opening. The pressure increase of the gas pumped by the impeller ahead of the output openings of the control disc in the direction of rotation of the impeller is thereby reduced.

Abstract: Liquid ring compressors and pumps using a ferrofluidic ring liquid are disclosed there being electrical coil means disposed around the compressor or pump casing to induce a field in the ferrofluidic ring liquid causing that liquid to form a rotating ring within the casing to drive the rotor.

Abstract: Solutions of phosgene, an organic solvent and nitrogen or oxygen compounds which have a higher boiling point than the solvent are evaporated in a vacuum which is produced by a liquid ring pump operated on a phosgene-containing solvent as working fluid, the used working fluid being subsequently returned to the process.

Abstract: A liquid ring pump comprising a housing, a substantially oval chamber within said housing, and a hub supporting a plurality of radially disposed vanes adapted to rotate within said chamber, said pump being such that the interstices between said individual vanes are partially blocked by a blocking mass which rotates with said vanes and which raises the stall pressure ratio of said pump to increase its pumping efficiency. The blocking mass is additional to the hub and in the case where the liquid ring pump also includes a gas/liquid mixture inlet port and a gas discharge port arranged on opposite sides of said pump, then the blocking mass forms a weir which gives the additional advantage that it acts to prevent the direct axial migration of liquid from said inlet port to said gas discharge port, thus enabling said pump to easily separate said gas liquid mixture into separate gas and liquid phases.

Abstract: Purging passages are machined or cast into the casing of a liquid ring compressor through which soluble or nonsoluble contaminants which may be present in the liquid ring may be removed from the compressor. These passages in single lobe pumps are located in the outer peripheral zones of the casing approximately 240.degree. from the pump land in the direction of rotation of the rotor in the area of the drive and idle ends of the rotor.