Abstract: The invention relates to a diaphragm pump (1) including a working diaphragm (3) that, during pumping movements, oscillates between a bottom dead center and a top dead center. The working diaphragm (3) delimits a pump chamber (7) between itself and a concave pump chamber wall (6) and when located at the top dead center position, the working diaphragm (3) rests against the pump chamber wall (6). The working diaphragm (3) has an inner and an outer annular zone (8, 9), which can be deformed during pumping movements, and a stiffened diaphragm area which, in essence, cannot be deformed during pumping movements is placed between these annular zones (8, 9). This non-deformable diaphragm area can be stiffened, for example, by stiffening ribs (10), which are radially oriented and spaced apart in the circumferential direction.

Abstract: A pump for gases to be measured having a pump housing in which a pump chamber is located. The pump chamber is sealed off by a working membrane that is connected to a crank drive by a connecting rod or similar lifting mechanism. A heating device is provided in an upper area of the pump housing, particularly in the pump head. Heat insulation covering at least the pump head is provided. The heat insulation is in the form of an insulating housing having an inner wall spaced apart from the pump head in order to form a gas insulation layer.

Abstract: A measuring gas pump (1) including a pump housing (2) with a pump chamber (3) inside which is sealed by a working membrane (5). The membrane (5) is connected: by a connecting rod (8) or a similar type of lifting device to a crank mechanism (9). A heating device is provided in the upper area of the pump housing, specifically in the pump head (10). On one hand, in the drive-transmission area between the head of the connecting rod (6) on the membrane side and the crank mechanism (9), there are holes (11) for the reduction of heat transfer to the crank mechanism which are spaced in a longitudinal direction of the connecting rod and which are also diametrically opposed, in peripheral direction, with a resulting reduction in heat conductivity. On the other hand, there is an enlargement of the surface area, at least in the area adjacent to the crank mechanism, for purposes of heat dissipation, specifically through cooling ribs (12).

Abstract: A rotary piston displacement device having an impeller housng with an approximately cylindrical receiving chamber in which an approximately cylindrical piston, which has a smaller outside diameter than and which is mounted eccentrically relative to, the receiving chamber, is provided mounted on an eccentric drive. The rotary piston forms an approximately sickle-shaped interspace between its outer wall and the inner wall of the receiving chamber. This interspace is divided into a pressure chamber and a suction chamber by a separating crosspiece that is placed between an inlet opening that is located inside the housing and an outlet opening. The outer and inner fixing locations of the separating crosspiece, which is connected to the housing on the one side and the piston on the other side, are offset with respect to one another in the peripheral direction of the rotary piston.

Abstract: A laboratory pump unit (1) for pipetting, filtering, and exhausting a gaseous or liquid fluid is provided. The laboratory pump unit (1) includes a pump (3), which can be connected on the suction side and/or the pressure side to a pipette (4) or other fluid receiver, for suctioning or ejecting the fluid. The laboratory pump unit includes, among other elements, a secondary tube (9, 10) that is connected to the suction tube and/or pressure tube (6, 7) that is connected to the pipette (4) or fluid receiver on the one hand and the pump (3) on the other hand, and is open to the atmosphere, and includes a throttle (11, 12) for limiting the amount of air drawn in or ejected. The laboratory pump unit (1) is operated in “open” pump operation on the suction side and pressure side with a precisely adjusted tube pressure in the suction tube or pressure tube (6, 7), which cannot be exceeded or fallen below by the pump (3).

Abstract: A multistage device (1) for delivering moist gases is provided. Said device comprises several delivery pumps (2, 3) each of which having a displacer that oscillates inside a delivery space, and being connected in series via a connection channel (6). The inventive device also comprises a ventilation device (7) which has at least one ventilation channel (8), whereby the ventilation channel (8) opens into a connection channel (6) that interconnects series-connected delivery pumps (2, 3). The inventive device (1) is characterized in that a ventilation valve (9), which can be motor-actuated by a control device, is interconnected inside the ventilation channel (8), and said ventilation valve (9) can be actuated as required by means of the control device and independent of the lift position of the displacers.

Abstract: A membrane pump (104) with an operating membrane (1) delimiting a conveying space (2), and a supplemental membrane (3) arranged on the side of the operating membrane (1) facing away from the conveying space (2), with a membrane interspace (4) provided between the operating membrane (1) and the supplemental membrane (3) as well as with a pump drive for oscillating movement of the operating and the supplemental membranes (1, 3) in the same direction. The membrane interspace (3) is joined with at least one suction channel (7) for relieving pressure of the membrane interspace (4). The membrane interspace (4) is pneumatically joined through the at least one suction channel (7) with the suction side of this membrane pump (104). The membrane pump of the invention (104) has a high suction capacity without the problem of buckling of the elastic operating membrane (1) in the intake phase.

Abstract: The invention relates to a process for conveying damp gases by means of a conveyor device (1) and also relates to a conveyor device (1) for carrying out the process. The conveyor device (1) has at least one feed pump (2) with an oscillating reciprocating piston (3) in a delivery chamber (7). In order to dry the conveyor device (1) effectively in the region of the delivery chamber (7), the delivery chamber (7) of at least one feed pump (2) is intermittently ventilated at various intervals in time using an ventilation device (15) while the conveyor device (1) is in operation.

Abstract: A reciprocating piston machine (1) with at least one inlet and/or outlet valve that has a strip, tongue or lamella shaped closing member (5). The opening movements (8) of the closing member (5) are limited through a stroke restrictor (6) assigned to each valve. The stroke restrictor (6) has or defines at least one ventilation hole (8) inside the contact area of the closing member (5). This ventilation hole (8) prevents the formation of air cushions (7) between the closing member (5) and the corresponding stroke restrictor (6) effectively. In the absence of the ventilation hole (8), the air cushion (7) can limit the opening movements of the closing member (5) prematurely, which in turn could lead to the generation of additional noise.

Abstract: A process for evacuating a wet or liquid conveying medium out of the treatment chamber (2) of a treatment device (1) using a pumping device (3) that has a single or multi-stage suction pump (4) is provided, where the conveying medium is cooled off during the evacuation along the flow path such that the conveying medium in the pumping device (3) is in the liquid aggregate state or is converted into that state. A treatment device for carrying out the process as well as a single or multi-stage suction pump for this treatment device is also provided.

Abstract: A diaphragm pump, especially a microdiaphragm pump, with a crank drive (1) having a connecting rod (2) and an elastic diaphragm (3) connected with the connecting rod (2) has on the back side of the diaphragm facing away from the compression chamber at least one undercut fastening opening (8) for insertion of the complementarily formed attachment end of the connecting rod. In order to be able to fix the diaphragm (3) so precisely on the connecting rod (2) that radial as well as axial forces do not move it from its position relative to the connecting rod (2), and in order that the diaphragm (3) is exposed to as little additional flexing work as possible, the connecting rod (2) is provided on its attachment end with a support surface (4) for underside support of the central diaphragm area having a bearing surface (5).

Abstract: An evaporation system for separation of a fluid mixture into its component parts, especially for the reclamation of solvents, has a vacuum pump connected to the evaporator, especially a rotation evaporator, with at least one separator being connected to the suction side of the vacuum pump and at least one secondary condenser being connected at the pressure side of the vacuum pump. A fine regulating valve (8) is installed in the connecting pipe (7) between the rotation evaporator (2) and the separator (9), which is connected in front of the vacuum pump (10), for regulation of the boiling pressure.

Abstract: A reciprocating piston machine (1) has an inlet valve (9) on the suction side and an outlet valve (10) on the delivery side, which valves exhibit a valve body having a valve disc (11, 12) comprising of an elastomer, whereby the compression chamber (6) sealed off by the reciprocating piston or similar displacer (2) and by the valves (9, 10) has a pressure relief connection between compression chamber and atmosphere. To be able to bring the compression chamber (6) quickly to atmospheric pressure after the reciprocating piston machine (1) has been put out of operation and to be able to bring about the restart of the reciprocating piston machine (1) so as to be load-free in this respect, the valve disc (11,12) of the valve (9, 10) on the delivery side and/or on the suction side has at least one capillary passage (18, 19) as pressure relief connection.

Abstract: A diaphragm pump (1) has a shaped diaphragm (2) of elastic material. The central zone (3) of the diaphragm (2) is thickened in the direction of stroke and is surrounded by a flexible annular zone (5) held on the pump case by an external clamping edge (6). The central zone (3) of the diaphragm (2) is engaged by a connecting rod (11) with which the shaped diaphragm (2) is displaceable from a top to a bottom dead-centre position and vice versa. Radial ribs (19) as well as stabilizing ribs (19) extending in the circumferential direction are arranged on the underside (17) of the annular zone (5). Therefore a shaped diaphragm (2) is obtained which in the annular zone (5) is flexible about a circumferential line, but which nevertheless exhibits comparatively high flexural strength about a diametral line. Deformation of the shaped diaphragm (2) under vacuum is thereby reduced.

Abstract: A pump stand (1) has a base plate (2) with a pump (3) mountable thereon. The pump (3) has supports (4) serving as its vibration damping elements with which it stands upon the base plate (2). Coupling elements (5) are provided on the pump underside and on the base plate upper side, for coupling the pump (3) and the base plate (2) with each other, whereby the coupling elements essentially engage in the assembled state of the pump without locking. The coupling elements (5) are located at a defined place suitable for pumps of different sizes.

Abstract: A diaphragm pump 1 has a reciprocating piston 2 operated with the aid of a connecting rod 5 and by this means moves an attached diaphragm 4 fixed in the pump housing 3. The connecting rod 5, in turn, is acted upon and driven at the end facing away from the reciprocating piston 2 by an eccentric 6 or a cranked portion of the drive shaft 11. The rotating masses and at least part of the oscillating masses of the pump are balanced by at least one fixedly mounted counterweight 7 moving in synchronism therewith. For the automatic correction of varying out-of-balance conditions due to variable gas forces or medium forces, a self-regulating system of rolling elements 12 is provided in an annular, empty cavity 9 that is arranged concentrically to the axis of shaft rotation and is situated within a co-rotating housing 10.

Abstract: A two-stage positive displacement pump (1) is used in particular to operate in conjunction with a turbomolecular pump (2) that can be placed ahead of it in series. The two-stage positive displacement pump (1) is configured as a hybrid pump (3) that has on the medium-entry side a reciprocating pump (5) with a comparatively large displacement area (6), whereby its piston-cylinder space (7) is sealed off with respect to the crank area (8) by means of a sealing membrane (9). Also as a part of this two-stage positive displacement pump (1) which forms the hybrid pump (3), there is placed in series behind the reciprocating pump (5) a diaphragm pump (10), whose displacement area (11) is noticeably smaller compared to that of the reciprocating pump (5).

Abstract: A diaphragm pump (1) with a working diaphragm (16) is provided with an additional diaphragm (26) arranged at a distance (a) from the working diaphragm (16), between the working diaphragm and eccentric drive (7). The diaphragm pump (1) provided with an additional diaphragm may alternatively have a swing connecting-rod with U packing ring instead of the working diaphragm (16). The additional diaphragm, together with a lateral confinement formed by an intermediate casing (4) of the pump case (2), composes an essentially closed diaphragm interspace. A deformable annular zone (30) of the additional diaphragm (26) has a channel-like convexity (31) which, in the undeformed condition of the diaphragm, points in the direction of the eccentric drive (7). For this purpose, the elastically deformable annular zone (30) of the additional diaphragm (26) has a radial expanse wider than the deformable annular zone (24) of the working diaphragm (16).

Abstract: A diaphragm pump with a driving motor has arranged in a case (5) at lease one drive (3) for transferring the pump movement to a pump diaphragm (4a). The case (5) of the diaphragm pump is essentially formed by at least one extrusion (6) configured to accommodate the drive(s) (3) and the driving motor (2). The extrusion (6) carries the driving motor (2), the drive(s) (3) and the pump head(s) (4). The extrusion (6) enables the pump case (5) to be specially dimensionally stable, to be manufactured at reasonable price, and has substantially smooth external surfaces. It is therefore easy to clean.

Abstract: A membrane pump has a housing which includes a pump head provided with an internal recess. The pump head is further provided with an inlet opening and an outlet opening which communicate with the recess and are disposed next to one another near an edge of the housing. A membrane extends across the recess and is clamped at its edges by the housing. The membrane and recess together define a pumping chamber. A segment of the membrane is held stationary against the pump head by a clamping finger and forms a seal with the pump head. The seal extends radially between the inlet and outlet openings from the periphery of the pumping chamber to its center. A drive successively urges circumferrentially successive segments of the unconfined part of the membrane into sealing engagement with the pump head to thus direct fluid from the inlet opening to the outlet opening.