A device evacuates a chamber and purifies the gas extracted from said chamber of any foreign substances. The device comprises a dry-condensing vacuum pump having an input connected to the chamber to be evacuated and is suitable for maintaining the input pressure at a constant level at the output despite variable conditions. An intermediate line which connects to the output of the dry-condensing vacuum pump and a liquid ring vacuum pump, the input of which is connected to the intermediate line, are additionally provided. A corresponding method makes it possible to purify the gas of any foreign substances reliably and effectively.
F04C 19/00 - Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 25/02 - Adaptations for special use of pumps for elastic fluids for producing high vacuum
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
B01D 47/00 - Separating dispersed particles from gases, air or vapours by liquid as separating agent
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
A fluid ring compressor comprises a first single-acting compression stage having a first impeller eccentrically mounted in a housing and a second single-acting compression stage having a second impeller eccentrically mounted in a housing. The first compression stage and the second compression stage are separated from one another by a sealing gap. The sealing gap is arranged between a suction section of the first compression stage and a suction section of the second compression stage.
F04C 19/00 - Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
F04C 27/00 - Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
A side-channel pump having a pump housing in which an operating chamber which is provided with a side channel and a motor are arranged, and having an impeller in the operating chamber which rotates with a shaft which is driven by the motor. A cooling circuit extends from the operating chamber to the motor and from the motor to a suction portion of the pump, wherein the cooling circuit is supplied from an operating chamber whose outlet side is connected to an outlet opening of the side-channel pump. Using the pump, gas can be drawn in without the pump becoming overheated.
The invention relates to a screw pump having two screws, in which screw pump each screw has a first thread and a second thread. The threads extend in each case from a suction side to a delivery side. The threads are in engagement with one another, with the result that the threads are divided into a plurality of working chambers, the volume of which decreases from the suction side to the delivery side. According to the invention, the threads have two thread turns. Moreover, the invention relates to a screw for a pump of this type. On account of the uniform distribution of mass of the two-turn threads, the pump can be operated at a high rotational speed, with the result that the throughput of the pump is increased.
F04C 18/08 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
The invention relates to a side-channel pump with a pump housing (15), in which a working chamber (23) provided with a side channel (24) and a motor (19, 20) are arranged, and with an impeller (22) in the working chamber (23), said impeller being rotated by a shaft (14) driven by the motor (19, 20). According to the invention, a cooling circuit (40, 44, 45, 46) extends from the working chamber (23) to the motor (19, 20) and from the motor (19, 20) to a suction section (46) of the pump. The cooling circuit (40, 44, 45, 46) is supplied from the working chamber (23), the outlet side of which is connected to an outlet opening (17) of the side-channel pump. Gas can be suctioned using the pump without overheating the pump.
The invention relates to a fluid ring compressor comprising: a first single-acting compression stage (17) having a first impeller (23) eccentrically mounted in a housing (14); and a second single-acting compression stage (18) having a second impeller (24) eccentrically mounted in a housing. The first compression stage (17) and the second compression stage (18) are separated from one another by a sealing gap (28). According to the invention, the sealing gap (28) is arranged between a suction section (271) of the first compression stage (17) and a suction section (272) of the second compression stage (18).
F04C 19/00 - Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
7.
Pump assembly and method for evacuating a vapor-filled chamber
The invention relates to an assembly comprising a vacuum pump and a chamber, wherein a suction tract extends between the chamber and the vacuum pump. The vacuum pump is a liquid ring machine. According to the invention, a liquid outlet is arranged in the suction tract in order to add liquid to gas sucked in from the chamber. The invention further relates to a method for evacuating a chamber filled with vapor. According to the invention, the vapor is condensed by introducing additional liquid into the suction tract, thus by co-condensation. By supplying liquid selectively only when liquid is required for the condensation of the vapor, water is saved.
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
F04C 25/02 - Adaptations for special use of pumps for elastic fluids for producing high vacuum
F04C 28/10 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
The invention relates to a side-channel pump and to a method for operating a side-channel pump in which an impeller rotates in a working chamber provided with a side channel. According to the invention, the pump is operated at an overspeed with a gas-filled working chamber in a first step. The speed is then reduced to an operating speed in order to pump a liquid. The pump according to the invention has a high suction power as a result of the overspeed, but only gas is drawn initially.
A method for evacuating a chamber employs a pump arrangement composed of a booster pump and of a downstream forepump is connected to the chamber. The booster pump is accelerated, gas from the chamber is introduced into the booster pump, such that from the booster pump there is temporarily extracted an excess power which exceeds the power provided by the drive of the booster pump. The gas is discharged through a bypass valve while the outlet pressure of the booster pump lies above a predefined threshold value, and the gas is directed to the forepump when the outlet pressure of the booster pump has fallen below the threshold value. The gas supplied by the booster pump is compressed by means of the forepump.
F04C 2/10 - Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
F04C 14/08 - Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
F04C 28/06 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
F04C 28/02 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
F04C 25/02 - Adaptations for special use of pumps for elastic fluids for producing high vacuum
F04C 18/08 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
10.
Liquid ring vacuum pump with cavitation regulation
A method for operating a liquid ring vacuum pump employs taking vibration measurements of the pump and comparing the measurements with a prescribed cavitation threshold. In addition, a measurement representing the liquid content in the gas to be conveyed is taken. This measurement is compared with a prescribed threshold. The rotational speed of the liquid ring vacuum pump is reduced if the prescribed cavitation threshold has been exceeded and the liquid content is less than the prescribed threshold. The rotational speed is increased if the prescribed cavitation threshold has been exceeded and the liquid content is greater than the prescribed threshold. A liquid ring vacuum pump is designed for implementing the method. Due to the regulation depending on the oscillations of the pump, the pump can be operated near the cavitation boundary without any risk of damage.
F04C 28/08 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
F04C 25/02 - Adaptations for special use of pumps for elastic fluids for producing high vacuum
11.
Bearing arrangement and wear indicator for a liquid ring vacuum pump
A liquid-ring vacuum pump comprises a pump casing and a shaft eccentrically mounted in the pump casing. An impeller and a rotor of a drive motor are connected to the shaft. A disk cam is arranged parallel to the impeller. A first main bearing for the shaft is arranged between the impeller and the rotor of the drive motor, on the plane of the disk cam. The impeller is arranged between the first main bearing and a second main bearing. The arrangement of the bearings prevents the shaft from bending, thus allowing the leakage gap between the impeller and the disk cam to be kept small.
F04C 29/00 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups
F04C 7/00 - Rotary-piston machines or pumps with fluid ring or the like
12.
PUMP ASSEMBLY AND METHOD FOR EVACUATING A VAPOR-FILLED CHAMBER
The invention relates to an assembly comprising a vacuum pump (16) and a chamber (15), wherein a suction tract (17) extends between the chamber (15) and the vacuum pump (16). The vacuum pump (16) is a liquid ring machine. According to the invention, a liquid outlet (18) is arranged in the suction tract (17) in order to add liquid to gas sucked in from the chamber (15). The invention further relates to a method for evacuating a chamber (15) filled with vapor. According to the invention, the vapor is condensed by introducing additional liquid into the suction tract, thus by co-condensation. By supplying liquid selectively only when liquid is required for the condensation of the vapor, water is saved.
F04B 37/14 - Pumps specially adapted for elastic fluids and having pertinent characteristics not provided for in, or of interest apart from, groups for special use to obtain high vacuum
13.
SIDE-CHANNEL PUMP, AND METHOD FOR OPERATING A SIDE-CHANNEL PUMP
The invention relates to a side-channel pump (28) and to a method for operating a side-channel pump (28) in which an impeller (22) rotates in a working chamber (23) provided with a side channel (24). According to the invention, the pump (28) is operated at an overspeed with a gas-filled working chamber (23) in a first step. The speed is then reduced to an operating speed in order to pump a liquid. The pump according to the invention has a high suction power as a result of the overspeed, but only gas is drawn initially.
The invention relates to a screw pump having two screws (14), in which each screw (14) has a first thread (19) and a second thread (19). The threads (19) each extend from a suction side (20) to a pressure side (21) and mesh with each other such that the threads (19) are divided into a plurality of working chambers, the volume of which decreases from the suction side (20) to the pressure side (21). According to the invention, the threads (19) have two thread turns.
F04C 18/08 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
15.
METHOD AND PUMP ARRANGEMENT FOR EVACUATING A CHAMBER
Method for evacuating a chamber (42), according to which a pump arrangement comprising a booster pump (46) and a downstream forepump (47) are connected to said chamber (42). The booster pump (46) is accelerated and gas from the chamber (42) is admitted into said booster pump (46) such that an excess power is temporarily drawn from the booster pump (46), which power goes beyond that provided by the drive (17) to the booster pump (46). The gas is conveyed to the outlet of the booster pump (46) and discharged through a bypass valve (49) as long as the outlet pressure of the booster pump (46) lies above a specified threshold value. The gas is passed to the forepump (47) when the outlet pressure of the booster pump (46) has fallen below the threshold value. The invention further relates to a pump arrangement for carrying out the method.
F04C 18/16 - Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
F04C 25/02 - Adaptations for special use of pumps for elastic fluids for producing high vacuum
F04C 28/02 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
F04C 28/06 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for stopping, starting, idling or no-load operation
16.
LIQUID RING VACUUM PUMP WITH CAVITATION REGULATION
The invention relates to a method for operating a liquid ring vacuum pump in which vibration measurements of the pump are taken and compared with a prescribed cavitation threshold (26). In addition, a measurement representing the liquid content in the gas to be conveyed is taken. This measurement is compared with a prescribed threshold. The rotational speed of the liquid ring vacuum pump is reduced if the prescribed cavitation threshold (26) has been exceeded and the liquid content is less than the prescribed threshold. The rotational speed is increased if the prescribed cavitation threshold has been exceeded and the liquid content is greater than the prescribed threshold. The invention also relates to a liquid ring vacuum pump designed for implementing the method. Due to the regulation depending on the oscillations of the pump in accordance with the invention, the pump can be operated near the cavitation boundary without any risk of damage.
F04C 28/08 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
17.
DEVICE AND METHOD FOR EVACUATING A CHAMBER AND PURIFYING THE GAS EXTRACTED FROM SAID CHAMBER
The invention relates to a device for evacuating a chamber (14) and for purifying the gas extracted from said chamber (14) of any foreign substances. The device comprises a dry-condensing vacuum pump (15) having an input (17) connected to the chamber to be evacuated (14) and which is suitable for maintaining the input pressure at a constant level at the output (18) despite variable conditions. An intermediate line (19) which connects to the output (18) of the dry-condensing vacuum pump (15) and a liquid ring vacuum pump (20), the input of which is connected to the intermediate line (19), are additionally provided. The invention also relates to a corresponding method. The invention makes it possible to purify the gas of any foreign substances reliably and effectively.
F04C 19/00 - Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
F04C 23/00 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluidsPumping installations specially adapted for elastic fluidsMulti-stage pumps specially adapted for elastic fluids
The invention relates to a liquid-ring vacuum pump comprising a pump casing (18) and a shaft (19) eccentrically mounted in the pump casing (18). An impeller (21) and a rotor (20) of a drive motor (20, 24) are connected to the shaft (19). A disk cam (22) is arranged parallel to the impeller (21). According to the invention, a first main bearing (22) for the shaft (19) is arranged between the impeller (21) and the rotor (20) of the drive motor, on the plane of the disk cam (22). The impeller (21) is arranged between the first main bearing (22) and a second main bearing (26). The arrangement of the bearings according to the invention prevents the shaft (19) from bending, thus allowing the leakage gap between the impeller (21) and the disk cam (22) to be kept small.
A liquid-ring vacuum pump comprises a pump casing (20) and an impeller (14) that is eccentrically mounted in the pump casing (20). According to the invention, the impeller (14) is made of a material having a modulus of elasticity of less than 4000 N/mm2. The invention further relates to an impeller (14) for such a pump.
The apparatus for monitoring appliances and machines having rotating components, particularly for monitoring compressors, vacuum pumps and other pumps, has a sensor, an evaluation electronics unit and an interface for the output of signals. The evaluation electronics unit has a microprocessor having three inputs for performing measurements in three different frequency ranges at different frequency resolutions, with the respective vibration intensities being averaged at a plurality of frequencies in line with the third-octave spectrum. The interface is a two-wire interface which is used to report different operating states using different DC values.
G01B 3/44 - Gauges with an open yoke and opposed faces, i.e. calipers, in which the internal distance between the faces is fixed, although it may be preadjustable of limit-gauge type, i.e. "go/no-go" preadjustable for wear or tolerance
patents
