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.

Abstract: A plug, such as a vent plug for mounting in a hole in the wall of a machine element, e.g. the end wall of the rotor casing of a pump comprising a canned motor, comprising an outer cup provided with a support flange and an inner cup pressed into the outer cup and comprising a locking device. The locking device is preferably formed as a locking flange, e.g. in the form of part of a thread serving to interlock the plug and the wall. The distance between the locking device and a sealing face of the support flange or of a sealing element connected to the support flange is smaller than the axial displacement of the plug in connection with the engagement of the locking device with the wall.

Abstract: A height adjusting device for machines or machine elements comprises three adjustment members positioned atop one another and together determining two sets of opposing surfaces. These surfaces allow a gyroscopic movement of the uppermost adjustment member, and the height of the height adjusting device can be adjusted stepwise, one of the two opposing surfaces in the first set of surfaces comprising one or more aligned supporting projections. These projections can cooperate selectively and tiltably with one or more recesses in a row of recesses in the second surface of the first set of surfaces. The depth of the recesses in said row of recesses varies stepwise. The surfaces of the second set of surfaces are provided with cooperating secondary projections and secondary recesses. The line on which the secondary projections are positioned forms an angle of substantially 90.degree. with the line on which the supporting projections are positioned.

Abstract: A rotating flow pump such as a centrifugal pump is provided with a feed pump unit formed as an ejector. The feed pump unit comprises an inlet portion, a nozzle, and a diffuser arranged in succession, and the diffuser is connected to the inlet opening of the flow pump. The inlet portion, the nozzle, and the diffuser of the ejector are situated in a plane perpendicular to the shaft of the flow pump. The diffuser comprises an inner channel of a uniformly increasing flow cross section at least over part of its length. Furthermore the diffuser comprises an outer jacket situated substantially coaxially about the above channel. Thus the jacket is formed in such a manner that a substantially 180.degree. almost mushroom-shaped turning of the flow direction for the liquid flowing through the diffuser is obtained at the same time as a uniformly increasing flow cross section--seen in the flow direction--is obtained within the annular chamber between the channel and the jacket.

Abstract: This invention relates to a pumping assembly for heating and faucet water plants, comprising a wet-armature motor and a centrifugal pump driven thereby, the casing of which is pressed to shape from metal plate and has an axially directed collar against which bears the encircling marginal area of a partition separating the pumping space from the motor space, and which is joined by welding to an equally encircling marginal area of the split tube separating the armature space from the stator space. A particularly uncomplicated and safe joint results between the components in question due to the fact that, in accordance with the invention, the partition and the split tube are interwelded at least at points in their mutual contact area and are, jointly with the armature connected to the pump casing, to form a structural unit ready for installation, by connecting the collar of the pump casing in liquid-tight manner to the said marginal area of the split tube by pressure welding.

Abstract: In the case of a pumping set comprising an electric motor and a rotary pump driven by the same, the r.p.m. may be controlled as a function of selected operating parameters of the set in steps within the area of a characteristic field, the limits of which are determined on the one hand by the two modulating graphs for the maximum and minimum r.p.m. figures and on the other hand by the co-ordinates delivery head and delivery flow. A particular partial span may in each case be determined on the modulating graphs valid for constant r.p.m. figures. An r.p.m. switching action is triggered upon reaching the operating parameters of the set representative for the terminal values of the partial spans, the r.p.m. being lowered if the one terminal value is reached on one partial span with the greater delivery head and the lesser delivery flow, and raised if the other terminal value on the partial span in question is obtained with the lesser delivery head and the greater delivery flow.

Abstract: The level detector is to be used for starting and stopping an electric system such as a pump. It comprises a piezo-electric crystal (31) squeezingly mounted between two elastically resilient membranes (22, 23) situated between two squeezing members (11, 12). These squeezing members form a top part (11) and a bottom part (12), respectively, which together form a sensor housing (10). On the outside the membranes are coated with a thin, insulating plastic layer (21, 24) and form the electric connection to the crystal. The two membranes are kept separated by means of a plurality of insulating, annular disks (25-28). In this manner a sturdy and reliable mounting of the piezo-electric crystal is obtained.

Abstract: A wet-motor pump having the rotor and the bearings utilize the pumped liquid, whereas the dry stator chamber with the stator windings is separated from and sealed against the rotor chamber through a tube-shaped can. The ends of the winding wires extend freely outwards on one side of the stator stack of sheets such as through an opening in the motor housing to be connectable to electric connections of a connection box mounted on the motor housing. A power cable for supply of energy to the windings is inserted in the connection box. The ends of the windings are connected to winding terminals in the stator chamber. The winding terminals are connectable to contacts and a plug. The plug comprising a shaft surrounding and isolating the contact may be inserted through the opening in the housing and into the stator chamber. As a result, a pump is obtained whereby the electric connections between the ends of the windings and the connections in the connection box may be provided in a simple and quick manner.

Abstract: A centrifugal pump for moving gaseous liquids comprises a gas separator situated in the suction chamber of the pump. The outlet of the gas separator is aligned with the inlet of the impeller, the degased liquid passing through said outlet. The separated gas is drained off to the ambiency through a tapped hole in the pump casing, to which a ventilator is connected. The gas separator is mounted in its fitting position after it has been carried from the pressure chamber of the pump and through an opening in a partition between the suction chamber and the pressure chamber and further on into the suction chamber. The gas separator is retained in its fitting position by means of securing means in the positions in which the water and gas outlets of the gas separator are situated. As a result, the pump casing may be manufactured from a simple and relatively small moulding piece. The pump casing need not comprise several parts.

Abstract: A circulating pump unit comprising a pump and a motor for heating and service water installations, in which the motor is settable to at least two different speeds of rotation by means of a rotation speed switch. According to the invention the motor (1) couples automatically and independently of the operational speed (n) set on the rotation speed switch (3), after switching off or switching on of the unit by means of a start-up switch (5) overriding the rotation speed switch to the rotation speed (n3) with maximum start-up moment (M3) and starts at this rotation speed and after a pre-determined time switches over to the operational rotation speed set on the rotation speed switch. Thereby the circulating pump unit will give a reliable start of the pump also after a standstill for a long time.

Abstract: In a device having a gas separation chamber situated between an entry pipe for a gas-containing liquid and an exit pipe for de-gassed liquid wherein a twisting motion is supplied to the gas-containing liquid in the chamber so that gas in the centrifugal field of flow is forced toward the center of rotation which falls on the center line of the chamber and passed to an outlet opening while de-gassed liquid flows away to the exit pipe at the circumference of the chamber, the improvement comprises a stationary sieve tube arranged coaxially in the chamber wherein the upper opening of the sieve tube is directed towards the outlet opening for the gas and connects the sieve chamber in primary connection with the exit pipe, which has a common center line with the entry pipe. The sieve piercings form a secondary connection to the exit pipe. The sieve tube is preferably installed at an angle of 45.degree. to the field of gravity of the earth.

Abstract: This invention relates to multi-spindle machine tools of the kind comprising a plurality of tool-carrying spindle heads stored in at least one magazine, said spindle heads being exchangeable as desired for the purpose of performing a tool change, a selected spindle head in the magazine being substituted for the one currently secured to the spindle head carrier, this latter spindle head being released from the carrier and conveyed to its predetermined storage space in the magazine, whereas the other spindle head selected in each case is withdrawn from the magazine and secured to the spindle head carrier.According to this invention, the spindle head carrier is constructed as a turret rotatable around a longitudinal axis and is provided with spindle head holders distributed along its outer periphery.

Abstract: The separator, as independent appliance or as integrated component of inline pumps, has a housing with liquid inlet and outlet connector pipes lying on one common center line and a substantially cylindrical separation chamber arranged therebetween. Into this chamber a liquid-gas mixture is introduced tangentially and set in rotation about the axis (y) of the chamber forming a center of rotation. The gas is forced to the center of rotation and conducted to the exterior while the degassed liquid flows out of the chamber through a separate opening. A plane (A) placed through the common center line (x) of the connector pipes and a plane (B) placed through the chamber axis (y) and standing perpendicularly on the plane (A) produce an intersection line (z) which forms with the center line an angle (a) in the order of magnitude of 0.degree.<.alpha.<90.degree., but preferably .alpha..apprxeq.45.degree..