Abstract:
The invention concerns an electric motor with a stator (10), in whose bore (13) a rotor is arranged, and with a control arrangement having at least one coil (9) with a core (15) passed by the motor current. The coil shall be arranged in a space saving manner without interfering too much with the magnetic field of the motor. To solve this problem the core (15) of the coil (5, 8, 9) is arranged on the stator (10) whose iron is used for a magnetic circuit.
Abstract:
A process for controlling a refrigeration system, as well as the refrigeration system and a new expansion valve for the refrigeration system. An electronic regulator is used to operate a sensor system having a device for applying heat power to the sensor system in direct dependence on sensed superheat of the refrigerant leaving the evaporator. By locating the sensing system in communication with liquid refrigerant upstream of the evaporator, heat transfer to the liquid refrigerant is utilized for operation of the sensor system rather than heat transfer to the superheat, resulting in a far more stable and efficient refrigeration control.
Abstract:
The invention concerns a radiator valve (1) with a housing (2, 3), a closure element (5) movable in the axial direction (6) towards or away from a valve seat (4) and a tappet (8) movable in the axial direction, which is led to the outside through an opening (9) in the housing (2), by which the opening (9) is sealed through by sealing (10) arranged in the housing (2) and enclosing the tappet (8). On one hand the embodiment of a valve of this kind must be simple, on the other hand it must enable inexpensive and simple repairing when leakages occur. For this purpose sealing room (12) surrounding the tappet (8) is arranged outside the housing (2), in which an additional sealing (16) can be placed. The housing (2) has a projection (14) providing a fixing for a sealing holder (17).
Abstract:
The invention concerns a frequency converter (15) for an electromotor (14) with an intermediary circuit (3, 4, 6, 7), in which a braking circuit (8, 9, 10) with a switch (8) and a load (10) is arranged. With such a frequency converter, it is possible to ease the demands on protection measures, even though the load (10) is placed outside the frequency converter (15). For this purpose, the load (10) is galvanically separated from the intermediary circuit (6, 7).
Abstract:
The invention concerns a nozzle unit for an oil burner consisting of a fan, a pump and a nozzle. The nozzle unit consists of a nozzle (2) and a pressure dependent valve (8). A cylinder (27) is arranged in the nozzle holder, in which cylinder the pressure dependent valve is mounted displaceably, so that the pressure dependent valve is pressed to rest against the nozzle by oil pressure.
Abstract:
A hydraulic steering device (1), in particular for vehicles, is disclosed, having a housing in which two sliders are arranged to move relative to one another and together form at least one adjustable throttle (A1-A6, Ad), a restoring device for restoring the two sliders to their neutral position being provided, one of the two sliders being driveable and the other of the two sliders being in operative connection with a measuring device (7). In such a steering device it is desirable to improve the correlation between steering torque and flow amplification; in particular it is desirable to linearize the relationship better. For that purpose the measuring device (7) is arranged in a flow path (8) closed in itself, and operates as a pump, whilst an open flow path (9) runs past the closed flow path (8) from an inlet connection arrangement (P, T) to an outlet connection arrangement (A, B).
Abstract:
An axial piston micropump (100) is disclosed, having a cylinder drum (2), in which several cylinders (41, 42) are provided, and a swash plate (1), with respect to which the cylinder drum (2) is rotatable. It is desirable for such a micropump to have a small displacement combined with a long service life and in which the displacement or delivery volume can be achieved with great accuracy. For that purpose, at least two cylinders (41, 42) are provided, of which at least one is in the form of a working cylinder (41) which has an associated working piston (3), whilst at least one other cylinder is in the form of a balance cylinder (42) and has an associated balance piston (4).
Abstract:
The invention concerns a hermetic cooling compressor with an electric motor having a variable speed controlled by a converter cooled by a cooling medium flow. Compressor and converter are forming a built together unit, in which a medium flowing through said unit is used for cooling of the electronic circuit of the converter. Thus the electronic circuit can be made without bulky cooling plates.
Abstract:
A hydraulic control arrangement (1) is disclosed having a directional valve (2), a metering pump unit (4) which has two metering pumps (5, 6) which are connected hydraulically in parallel and are operable mechanically in parallel, and a shut-off valve (8) in a hydraulic connection between the two metering pumps (5, 6), a pump connection (P) and a tank connection (T) which are connected to the metering pump unit (4) by way of the directional valve, and also two working connections (L, R) which are connected to the directional valve (2), a control inlet (19) of the shut-off valve (8) being connected to the pump connection (P). Such a control unit should be constructed to be user-friendly, especially for emergency operation. For that purpose, a safety valve arrangement (16, 20) is arranged between the control inlet (19) of the shut-off valve (8) and the directional valve (2).
Abstract:
A three-way or multi-way valve (1) is provided, which is built up of a plurality of two-way valves (11-14), each of which has a high pressure connection and a low pressure connection which are separated from each other by means of a valve seat with which a closure element co-operates, the two-way valves (11-14) being arranged to be operated in pairs or in groups by means of a control pressure fluid by way of a control pressure line (40a, 40b) opening into a pressure chamber (35a, 35b, 36a, 36b), and one of the two-way valves (pump valve 11, 12) of each group being arranged in a connection between a pressure source (6) and a load (2), and another two-way valve (tank valve 13, 14) of the same groups being arranged in a connection between the load (2) and a pressure sink (7). With a valve of this type, it is desired to obtain improved closing behaviour with simple construction. For this purpose, at least one of the connections, especially the high pressure connection, of at least one valve (11, 14; 12, 13) of each group communicates with the control pressure line (40a, 40b) by way of a throttle channel (33a, 33b, 34a, 34b).