摘要:
A rotary evaporator (1), having an equipment stand (2) with a protruding guide tower (3), a glass structure (4) which has an evaporation tank (5) and can be displaced on the guide tower (3) for lifting and lowering the evaporation tank (5) thereof, and at least one fluid line that is connected to the glass structure (4). In one embodiment, the guide tower (3) has a channel (17) that is oriented in the longitudinal extension of the tower (3) and in which a line section is provided of at least one fluid line that is connected to the glass structure (4) and opens out into or ends in a flexible tube connection. This flexible tube connection is arranged on a bottom-side region of the rotary evaporator, which faces away from the free end of the guide tower (3), and the glass structure (4) is retained on a carriage (21) that can be displaced laterally on the guide tower (3). In another embodiment of the invention, the carriage (21) can be displaced from a lifting position against a return force into a lowering position, and a stationary winch (35) located opposite the guide tower (3) is provided for displacing the carriage (21), said winch comprising at least one rope (37) that can be wound up and is retained or guided on the carriage (21).
摘要:
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).
摘要:
A vacuum pump stand (1) for generating and regulating the vacuum intended for a rotary vaporizer, including a control device having a control connection to a control unit (4) having at least one control element (3, 6). In the pump stand (1), the control unit (4) is designed as a remote control unit having a wireless control connection to the control device of the pump stand. Laboratory personnel can thus observe the rotary evaporator and the associated pump stand (1) through the divider of a fume cupboard, in order to be able to modify and readjust the process parameters at the remote control panel as needed. Because the remote control unit (4) has a wireless control connection to the control device of the pump stand (1), the fume cupboard no longer needs to be opened, even momentarily. Rather, the pump stand (1) can be operated from a sufficient distance outside the fume cupboard without the laboratory personnel needing to be exposed to special hazards.
摘要:
A diaphragm pump (1) having two diaphragm heads (15), in each case two diaphragms (6) and two separate pump housings (3) in which the connecting rods (5) for the diaphragms (6) are arranged, which connecting rods (5) can be driven by a common shaft (4). The drive for the shaft (4) can be arranged between the two pump housings (3). Here, the two pump housings (3) are connected to one another in an air-permeable fashion in particular by a connecting line (7), such that the air displaced in each case by the one diaphragm (6) can be moved into the other pump housing (3) in which the associated diaphragm (6) leads to a space enlargement as a result of being driven in the opposite direction.
摘要:
A pump (1) with an oscillating part having a housing (2) with a working chamber (3) and a crankcase (4) defined from the working chamber by the pump part. A pump drive mechanism (6) with a drive shaft (7) is located inside the crankcase (4) and the drive shaft is mounted on bearings (8, 9) that are arranged in the walls of the crankcase. The pump has a suction inlet separate from the crankcase. The pump (1) includes at least one flow channel in the crankcase wall for compensating pressure in the crankcase when the pump part oscillates and a flow damper arranged in the at least one flow channel. In a preferred embodiment, the at least one passage hole having at least one bearing therein is configured as the flow channel.
摘要:
A diaphragm pump (1) which has in at least one pump head (2) a working or pump diaphragm (3) which, by means of a clamping zone (4) arranged at its outer circumference, is clamped between two housing parts (5, 6) of a pump housing and which, between itself and a pump head part (6), borders a working or delivery chamber (8) and which, in a central zone (10), surrounds a diaphragm armature (11) which, on a side facing away from the working or delivery chamber (8) of the at least one pump head (2), is connected to a reciprocating drive (12) which is provided for generating an oscillating stroke movement of the working or pump diaphragm (3). The diaphragm pump according to the invention is characterized in that the annular zone arranged adjacent to the clamping zone (4) is formed as a guide zone (14) which, in the unloaded state of the working or pump diaphragm, is convexly curved and projects into the working or delivery chamber (8), with which guide zone (14) the working or pump diaphragm (3) rolls on a complementarily shaped annular or support zone (15) of the pump head (2) during the stroke movement of the working or pump diaphragm (3), and that a compensation zone (16) of the working or pump diaphragm (3) is provided between the guide zone (14) and the central zone (10), which compensation zone, in the unloaded state, is in contrast curved concavely and in the direction of the stroke drive (12). The diaphragm pump according to the invention is characterized by improved pump performance, a long service life and quiet and low-vibration pump operation.
摘要:
A multi-stage diaphragm suction pump, comprising at least two pump chambers, each having a fluid inlet having at least one inlet valve, and a fluid outlet having at least one outlet valve, and a suction line, which connects the fluid inlets of the pump chambers. Consecutive pump chambers are connected to each other by at least one connection line such that, when a differential pressure in the suction line is reached/exceeded, the diaphragm pump changes from parallel operation of the pump chambers thereof to an operating mode of the pump chambers that is at least also serial. At least one check valve, which opens to the downstream pump stage, is interposed in each of the inflow and outflow regions of the at least one connection line. In order to optimize the pump characteristic of such a diaphragm suction pump, at least in one pump chamber, either in order to improve the intake pressure the suction-side opening of the at least one connection line, or in order to improve the suction capacity the pressure-side opening of the at least one connection line, is disposed in the region of the pump chamber, or in the vicinity of the region of the pump chamber, on which the diaphragm associated with said pump chamber rolls off first during a pump cycle. In addition, or instead, according to a further embodiment at least one connection line, in particular between successive pump chambers, has a descending line progression and, for this purpose, compared to the outflow-side line segment, the inflow-side line segment of the at least one connection line is arranged at a higher level.
摘要:
A vacuum pump stand (1) for generating and regulating the vacuum intended for a rotary vaporizer, including a control device having a control connection to a control unit (4) having at least one control element (3, 6). In the pump stand (1), the control unit (4) is designed as a remote control unit having a wireless control connection to the control device of the pump stand. Laboratory personnel can thus observe the rotary evaporator and the associated pump stand (1) through the divider of a fume cupboard, in order to be able to modify and readjust the process parameters at the remote control panel as needed. Because the remote control unit (4) has a wireless control connection to the control device of the pump stand (1), the fume cupboard no longer needs to be opened, even momentarily. Rather, the pump stand (1) can be operated from a sufficient distance outside the fume cupboard without the laboratory personnel needing to be exposed to special hazards
摘要:
A brushless direct current motor including a rotor having permanent magnets, which rotates in a commutation created alternating magnetic field of a stator (1) is provided, which magnetic field is created by a coil system of wire coils (3) applied on an insulating body (4) in the circumferential direction and spaced apart from each other. Control electronics are provided for controlling the electric wire coils, spaced apart from each other, of the control system provided in the stator (1), with non-contact rotary position sensors (5) being allocated to the phases of the coil system (2). In the direct current motor according to the invention the rotary position sensors (5) are arranged on a sensor carrier (13). The sensor carrier (13) can be fastened at least at one face of the stator (1), and positioning aids cooperating with each other are arranged between the sensor carrier (13) and the adjacent stator face, which determine a relative position of the stator (1) in reference to the sensor carrier (13) and the rotary position sensors (5) arranged thereupon. If applicable, the direct current motor can be produced in an automated production method with little expense.
摘要:
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.