Abstract: An apparatus for distillation of a liquid near or above its critical point wherein the liquid contains a dissolved solid. The apparatus includes a separation section wherein the liquid may be separated into a vapor and a liquid residue separated by a liquid surface. The apparatus includes a pump for pumping liquid into the apparatus so as to establish and maintain the liquid and vapor in the separation section at a desired pressure and a heat source for heating the liquid and vapor so as to establish a rising temperature profile in the separation section. The pump and heat source are cooperatively controllable for regulating the position of the liquid surface so that liquid residue can be discharged from immediately below the liquid surface.

Abstract: A method for taking samples from a groundwater monitoring site realized by measuring an electric conductivity of contaminated groundwater during operating a pump at high r.p.m. and by controlling a predetermined minimum variation of the electric conductivity over a predetermined period of time with subsequent operating of the pump at low r.p.m.

Abstract: The electric motor is provided with an attached frequency converter for rotational speed control. The frequency converter consists of a power supply and other electronic elements. While these electronic elements are arranged as a constructive unit with the electric motor, the power supply is arranged as an individual constructive unit separated from the motor, in the form of a module. The module can be made separately from the motor and electrically connected to the motor constructive unit through a connective cable. The use of the motor is no longer dependent on cooling radiators, required for the cooling of the power supply, as only the module is now fitted with cooling radiators.

Abstract: In the method proposed a peripheral wall with at least one axial section of high shaping and fitting accuracy is made by forming an initial blank. This accuracy is achieved, in that before the peripheral wall is formed, sheet material which has been put into a plastic state is swaged in places round the periphery, then the swaged locations are sized, and/or in that during or after the formation of the peripheral wall, the wall is shaped by stamping in a plurality of places along its periphery, whereby the said zone providing shaping and fitting accuracy is formed from fitting areas at at least one side of the peripheral wall in the region of the swaged and/or stamped locations. An apparatus for carrying out such a method is generally in the form of a drawing machine, wherein the holder and/or the bottom die contain radial apertures, which open into the inner edge of the holder and/or into the shaping cavity of the die, and which are arranged at intervals round the periphery.

Abstract: The pump unit is provided, in particular for heating and cooling installations. The speed of the pump unit may be altered by changing the operating frequency of a frequency converter feeding the electric motor and which forms a structural unit with the pump unit. As soon as the pump unit has reached a parameter characterizing the thermal overload of the same, the frequency converter is controlled in a manner so as to reduce the speed, the reduced speed n' being greater or equal to half the normal speed n.

Abstract: An immersion pump assembly comprises a pump and a wet-rotor motor driving the pump and having a common hollow spindle for the motor and the pump. Liquid in the wet-rotor compartment of the motor can be introduced into the spindle and conveyed within the spindle into the pump casing in heat exchange relationship with the liquid conveyed by the pump, by way of the wall of the spindle. The liquid is returned from the spindle into the rotor compartment by a pumping action. The exit and return openings for the liquid in the rotor compartment are spaced from each other axially of the pump assembly.

Abstract: A method for winding a stator that may be used for single-phase and three-phase motors. The stator windings are spread across several slots of the stator so that some of the slots receive winding portions of several phase windings. The windings are made by using a mandrel that has step-formed portions with a plurality of winding surfaces. Some of the winding surfaces lie in the same plane so as to permit the windings wound thereon to fit properly into the slots of the stator.

Abstract: An immersion pump assembly comprises a wet-rotor motor of which the rotational speed and/or the torque can be varied by means of a frequency changer, and a pump unit. The frequency changer, the wet-rotor motor and the pump unit are arranged one above another within a tubular jacket. The motor comprises a split tube formed as a closed pot which is connected to the jacket and which separates the stator compartment from the pump unit in liquid-tight and pressure-tight fashion. The frequency changer is so installed in the stator compartment that its operating electronic system is disposed on the bottom of the split tube pot in the stator compartment.

Abstract: The present invention relates to an electromotor where its operational values, such as speed and torque, can be changed by means of a static frequency converter. The invention relates further to an electromotor combined with and driving a working unit such as a pump, a ventilator a machine tool or a tool. The frequency converter miniaturized by means of a high-integrated circuit is mechanically connected to form a structural unit with the motor or the working unit, and the dissipation heat of the frequency converter is emitted, preferably by means of ducted cooling, and the metal parts surrounding the frequency converter form the electric shielding thereof.

Abstract: An immersion pump assembly comprises a pump and a wet-rotor motor driving the pump. The motor and the pump have a common shaft which is closable and hollow and which is partly filled with a fluid, for dispersal of waste heat from the rotor chamber of the motor into a heat sink provided by the liquid to be conveyed by means of the pump. The shaft together with the fluid constitutes a rotating heat pipe system.

Abstract: The invention relates to a static frequency converter in a housing, especially a frequency converter controlling and/or adjusting the performance data of an electromotor. The housing is shaped as a pressure-resistant casing sealed toward the ambient and at least partially provided with a filler serving as a heat conductor for the dissipation of heat to the surface of the casing.

Abstract: A multistage rotary pump, which comprises a substantially closed pump body having a jacket surrounding the pump body in spaced relationship for the purpose of forming an annular return volume, a base element comprising suction and pressure connecting pieces and a top element comprising the driving motor. The jacket is provided in both its terminal portions with a peripheral contact shoulder which is acted upon in each case by an annular clamping arrangement, the clamping arrangement in question being connected on the other hand to the base element and top element, respectively. A coupling device of this nature is preferentially applied in the case of in-line rotary pumps.

Abstract: A multistage in-line rotary pump which comprises a closed pump body, a base element provided with suction and delivery connectors, and a head element. The pump body is surrounded by a cylindrical jacket or casing spaced from the pump body to form an annular return space, which casing is clamped between the base and head elements by means of stay bolts. Flat joints are provided between the base and head elements and the respective axial ends of the casing. To prevent high areal compression stresses in the area of the flat joints, the two extremities of the casing are plastically deformed to obtain a wall thickness which is greater than the wall thickness of the rest of the casing tube.

Abstract: The inventive assembly comprises a driven feed pump fed with untreated water, and a water circuit connected thereto with a driven circulation pump and a reverse osmosis unit, wherefrom subsequent to the reverse osmosis treatment part of the water is available as pure water whereas the remaining part leaves the reverse osmosis unit in form of concentrated untreated water and is at least partially returned to the circulation pump.In order to render such an assembly more compact and less expensive in production the feed pump and the circulation pump are arranged on a common shaft driven by one motor.Such an assembly is preferably used in private homes.

Abstract: A pump assembly for delivering liquids or gases include a pump and an electromotor for driving the pump, the speed and/or torque of the electromotor being made variable by a static frequency converter. The frequency converter can be miniaturized by highly-integrated circuits and other provisions for a sufficient emission of dissipation heat. The frequency converter is arranged inside or on the pump assembly, forming a structural unit with pump assembly, and the dissipation heat of the frequency converter is emitted by the fluid delivered or to be delivered by the pump assembly, the fluid acting as dissipator.

Abstract: The invention relates to an oscillating jet meter for fluids, with an assembly in which are formed substantially the chambers and passages of the flow system conveying the fluid, and wherein the inlet and outlet openings of the flow system are in communication with respective pipe connections for the installation of the meter. An oscillating fluid jet is generated in the flow system, the frequency of which within the designated measurement range is at least approximately proportional to the flow velocity of the fluid and which is measured with a measuring instrument so as to determine the throughflow of the fluid in a calculating unit. The aforementioned assembly is in the form of a housing which is closed, except for the inlet and outlet openings, whereas the housing is surrounded on all sides by a pressure-tight casing which carries the two pipe connections.

Abstract: A rotary circulating pump for heating systems comprises a pump housing with suction and delivery sides separated from one another by an impeller and having a calming or damping chamber situated on the suction side with an integral separator chamber connected thereto for removal of air from the fluid passing through the pump. A flow divider splits the fluid entering into the pump housing into two part flows before they reach the calming chamber. To enhance the separation of air bubbles, the flow divider is so constructed that it imparts to the part flows a rotational motion which is superimposed over their translatory displacement, and deflects the part flows radially as well as axially away from the suction aperture of the pump impeller.

Abstract: On the suction side of its pump housing a pump is provided with a gas separator optionally built integrally with the pump housing. The gas separator comprises a cyclone chamber with an inlet channel for a gas or air-containing pump medium, and a liquid outlet channel connected to the inlet of the pump. A bleed housing is provided at the upper end of the cyclone chamber, said bleed housing comprising an air duct. The air duct is substantially Z-shaped and of a cross section deviating from circular shape. The air duct comprises furthermore a relatively wide groove over at least a portion of its length and at its upper wall. The groove extends from adjacent the inlet of the air duct and forwards into said duct. In this manner a separation of gas or air from the gas or air-containing pump medium is obtained which is more reliable than the previously known separation.

Abstract: A pump with a canned motor (1) comprises a hollow shaft (4) open at the ends (5, 6) and provided with shaft ends (7, 8) and made of a relatively thin-walled tube. The portions (7, 8) of the shaft (4) are of a reduced diameter (d.sub.1, d.sub.2). A reciprocating ball (12) is situated in the cavity between a first shaft portion (8) and a second shaft portion (7), said first shaft portion forming a shaft end and provided with a spline (17). This ball abuts seats (13, 14) resulting from the reduction of the diameter of the shaft portions (7, 8), whereby the ball (12) and the seats (13, 14) form a valve. In this manner the valve of the hollow shaft (4) is provided in a particularly simple manner as the seats (13, 14) can be provided simultaneously with the manufacture of the shaft portions (7, 8) of a reduced diameter. The shaft portion (8) carrying the impeller (10) is provided with a spline which provides the hollow shaft (4) with the necessary torsional strength.

Abstract: An electric motor comprising a motor overload protection such as a thermal switch and a main relay for controlling a multipolar switch in the voltage supply conductors of the motor. The thermal switch and the main relay are mounted in a control circuit in parallel with the voltage supply conductors. An auxiliary relay is coupled in parallel with the main relay and can connect an auxiliary motor via a contact arm when the thermal switch is switched off.