Abstract: A valve for a drinking water installation for larger volume flow of cold water, depending on an adjustable or non-adjustable water temperature, having a valve housing with connections to a pipeline and a regulating piston which is movable in the valve housing, coupled to a spindle exposed on the outer side of the valve housing, with a thermal expansion element exposed in the flow path through the valve housing and resting under the pretension of a spring element against the regulating piston, the regulating piston being movable relative to a bore due to the expansion of the expansion element.

Abstract: The present invention relates to a plate heat exchanger system with a plate heat exchanger (10) comprising an inlet (11) and an outlet (12) of a primary circuit (13), an inlet (14) and an outlet (15) of a secondary circuit (16), at least one plate (17) separating the two circuits in a housing of the plate heat exchanger from each other, and preferably a pipe which connects the primary circuit to a heating device. For improving heat transfer between the primary circuit (13) and the secondary circuit (16), the plate heat exchanger (10) is according to the invention in the direction of gravity (G) arranged such that the plane (E), in which the plate (17) is located, is inclined relative to the gravity vector (G) and the horizontal (H).

Abstract: The present invention relates to a valve for drinking water installation, comprising a valve housing (2) with connections to a pipeline, and a regulating piston (28), which is movable in the valve housing (2) and coupled to a spindle (14) exposed on the outer side of the valve housing (2) and which cooperates, on the side opposed to the spindle (14), with a thermal expansion element (24) exposed in a flow path through the valve housing (2) and resting under the pretension of a spring element (34) against the regulating piston (28), the regulating piston (28) being movable relative to a bore (54) due to the expansion of the expansion element (24).

Abstract: The present invention relates to a plate heat exchanger system with a plate heat exchanger (10) comprising an inlet (11) and an outlet (12) of a primary circuit (13), an inlet (14) and an outlet (15) of a secondary circuit (16), at least one plate (17) separating the two circuits in a housing of the plate heat exchanger from each other, and preferably a pipe which connects the primary circuit to a heating device. For improving heat transfer between the primary circuit (13) and the secondary circuit (16), the plate heat exchanger (10) is according to the invention in the direction of gravity (G) arranged such that the plane (E), in which the plate (17) is located, is inclined relative to the gravity vector (G) and the horizontal (H).

Abstract: A method for determining the fatigue of the pump rotor of a gas turbopump comprises the following method steps: continuous determination of the rotational speed (n) of the pump rotor, determination of the local rotational speed maxima and minima of a temporal rotational speed profile under consideration, association of the rotational speed maxima and minima with each other to form pairs, determination of a pair fatigue value (L) for each of the rotational speed pairs, and accumulation of all pair fatigue values (L) to form a total fatigue value (Ltot). In this manner it is possible to determine the cyclic stress for the pump rotor of a vacuum pump and to include it in the calculation of a total fatigue value.

Abstract: The present invention relates to a connection fitting for the connection of a ring with at least one consumer to a storey or rising main branch with inlet and outlet openings (2, 4) which can be connected to the branch and an intervening merge opening (34) for the ring main which is preceded in the flow direction (S) by a cross-section constriction (16). The present invention also relates to a water pipe system with at least one storey or rising main branch to which several ring mains are connected via separation and merge openings and a cross-section constriction provided between the separation and merge openings of the assigned ring main in the branch. The object of the present invention is to specify a connection fitting which leads to improved flow characteristics in the region of the ring main assigned to the connection fitting and to provide a water pipe system which fulfils the practical requirements in an improved manner.

Abstract: The present invention relates to a connection fitting for the connection of a ring with at least one consumer to a storey or rising main branch with inlet and outlet openings (2, 4) which can be connected to the branch and an intervening merge opening (34) for the ring main which is preceded in the flow direction (S) by a cross-section constriction (16). The present invention also relates to a water pipe system with at least one storey or rising main branch to which several ring mains are connected via separation and merge openings and a cross-section constriction provided between the separation and merge openings of the assigned ring main in the branch. The object of the present invention is to specify a connection fitting which leads to improved flow characteristics in the region of the ring main assigned to the connection fitting and to provide a water pipe system which fulfills the practical requirements in an improved manner.

Abstract: A high-speed turbomachine includes a magnetic bearing (22, 23) and a retainer bearing for mounting the rotor. The retainer bearing is embodied as a sliding bearing (26, 27) and encompasses a bearing shell (28) at the stator end, a bearing shaft (20) at the rotor end, and an intermediate bushing (30) between the bearing shell (28) and the bearing shaft (20). The intermediate bushing (30) is spaced apart from both the bearing shaft (20) and the bearing shell (28) by a circular gap (33, 34). The intermediate bushing (30) is rotatable relative to the bearing shell (28) and the bearing shaft (20). As a result of this design, the sliding bearing (26) is provided with two pairs of sliding surfaces, onto which all occurring dynamic forces are distributed such that wear is significantly reduced, thus allowing sliding bearings to be used as retainer bearings in a magnetically mounted high-speed turbomachine.

Abstract: The invention relates to a vacuum pump in which the gas bearing is coated with a hard layer, and to a process for preparing such gas bearing of a vacuum pump.

Abstract: A method for determining the fatigue of the pump rotor of a gas turbopump comprises the following method steps: continuous determination of the rotational speed (n) of the pump rotor, determination of the local rotational speed maxima and minima of a temporal rotational speed profile under consideration, association of the rotational speed maxima and minima with each other to form pairs, determination of a pair fatigue value (L) for each of the rotational speed pairs, and accumulation of all pair fatigue values (L) to form a total fatigue value (Ltot). In this manner it is possible to determine the cyclic stress for the pump rotor of a vacuum pump and to include it in the calculation of a total fatigue value.

Abstract: The invention relates to a vacuum pump in which the gas bearing is coated with a hard layer, and to a process for preparing such gas bearing of a vacuum pump.

Abstract: The present invention relates to a connection fitting for the connection of a ring with at least one consumer to a storey or rising main branch with inlet and outlet openings (2, 4) which can be connected to the branch and an intervening merge opening (34) for the ring main which is preceded in the flow direction (S) by a cross-section constriction (16). The present invention also relates to a water pipe system with at least one storey or rising main branch to which several ring mains are connected via separation and merge openings and a cross-section constriction provided between the separation and merge openings of the assigned ring main in the branch. The object of the present invention is to specify a connection fitting which leads to improved flow characteristics in the region of the ring main assigned to the connection fitting and to provide a water pipe system which fulfils the practical requirements in an improved manner.

Abstract: Disclosed is a high-speed turbomachine comprising a magnetic bearing (22, 23) and a retainer bearing for mounting the rotor. The retainer bearing is embodied as a sliding bearing (26, 27) and encompasses a bearing shell (28) at the stator end, a bearing shaft (20) at the rotor end, and an intermediate bush (30) between the bearing shell (28) and the bearing shaft (20). Said intermediate bush (30) is spaced apart from both the bearing shaft (20) and the bearing shell (28) by means of a circular gap (33, 34). The intermediate bush (30) is rotatable relative to the bearing shell (28) and the bearing shaft (20). As a result of this design, the sliding bearing (26) is provided with two pairs of sliding surfaces, onto which all occurring dynamic forces are distributed such that wear is significantly reduced, thus allowing sliding bearings to be used as retainer bearings in a magnetically mounted high-speed turbomachine.

Abstract: A Holweck vacuum pump includes a pump rotor (16) having a rotating tube (24), a respective pump stator (12,14) comprising a helical thread groove (21,23) on the radial inside and outside of said rotor tube (24), and an inlet-side rotor blade disk (28) provided with a supporting ring (30) which supports said rotor tube (24). The blades (18) of said blade disk include rotor-side shoulders (40) which support the supporting ring (30).

Abstract: A friction vacuum pump (10) comprises a housing (12) defining a vaneless pump stator (30), a rotor drive and a rotor support which rotatably supports a pump rotor (16) provided with a vane (18). The housing (12) surrounds the overall axial length of the pump rotor (16), the rotor drive and the rotor support. Prior art housings are of multipart configuration and thus comprise seals between the housing portions. The seals are difficult to coat and may be or become locations where leaks occur. In contrast, the housing (12) is of one-piece configuration such that, in any case, the region of the housing (12) which is in contact with the vacuum gas is free of seals.

Abstract: A device (1), for evacuating a chamber to pressures in the high vacuum range includes a suction-side vacuum pump (2) and an atmospheric-pressure-side vacuum pump (3). The suction-side vacuum pump (2) is a mechanical kinetic vacuum pump with a rotor (11) and a stator (10). The stator (10) has a rotationally-symmetrical inner surface which matches the outer rotor geometry. The rotor (11) in the mechanical kinetic vacuum pump (2) is provided with a structure (13) carrying out the gas pumping. Said gas pumping structure comprises webs (14), the angle and width of which decrease from the suction side to the pressure side. The gas throughflow is improved. The outer diameter of the rotor (11) and the inner diameter of the stator (10) of the suctnion-side pump decrease from the suction side to the pressure side.

Abstract: A turbomolecular pump (10) comprises a stator (12, 18), a pump rotor (20) a motor (28) for driving the pump rotor and a control device (42). The control device (42) controls the motor output power such that the motor output power does not exceed a permissible maximum motor output power. On the stator side of the turbomolecular pump (10), temperature sensors (32–38) for measuring the stator temperature are arranged. The control device (42) comprises a maximum output power detecting device (50) that determines the permissible maximum motor output power in dependence on the measured stator temperature. Thus, the permissible maximum motor output power is not set to a constant value but always fixed in dependence on the current, measured stator temperature. Thereby, the capacity of the motor can be fully utilized as long as the measured stator temperature lies below a maximum value.

Abstract: A device (1), for evacuating a chamber to pressures in the high vacuum range includes a suction-side vacuum pump (2) and an atmospheric-pressure-side vacuum pump (3). The suction-side vacuum pump (2) is a mechanical kinetic vacuum pump with a rotor (11) and a stator (10). The stator (10) has a rotationally-symmetrical inner surface which matches the outer rotor geometry. The rotor (11) in the mechanical kinetic vacuum pump (2) is provided with a structure (13) carrying out the gas pumping. Said gas pumping structure comprises webs (14), the angle and width of which decrease from the suction side to the pressure side. The gas throughflow is improved. The outer diameter of the rotor (11) and the inner diameter of the stator (10) of the suctnion-side pump decrease from the suction side to the pressure side.

Abstract: A friction vacuum pump (1) has at least one turbomolecular pump stage (6, 7) with a molecular pump stage (12, 13, 15) that is subsequently connected on the pressure side (3), and with a transition stage (23) mounted between the turbomolecular pump stage and the molecular pump stage. In order to improve the transition from the turbomolecular zone to the molecular zone, the transition stage has a flow section that is continuously tapered in the tangential by limiting surfaces (27, 28).

Abstract: A turbomolecular pump (10) comprises a stator, a pump rotor, a motor (28) for driving the pump rotor and a control device (42). The control device (42) controls the motor output power such that the motor output power does not exceed a permissible maximum motor output power. On the stator side of the turbomolecular pump (10), temperature sensors (32-38) for measuring the stator temperature are arranged. The control device (42) comprises a maximum output power detecting device (50) determining the permissible maximum motor output power in dependence on the measured stator temperature. Thus, the permissible maximum motor output power is not set to a constant value but always fixed in dependence on the stator temperature. Thereby, the capacity of the motor can be fully utilized as long as the measured stator temperature lies below a maximum value.