Abstract: A micro-mixer is disclosed having at least one mixing point which is connected to an inlet channel arrangement having at least two inlet channels and to an outlet channel arrangement, and a mixing method is disclosed for at least two fluids which are supplied from different directions. With this mixer and method it is intended to achieve a rapid and predeterminable mixing of the fluids. For that purpose, a separating element which extends into a region of the mixing point in which the inlet channels run parallel to one another is provided. By this means the fluids can be kept separate from one another until their flow speeds virtually coincide in respect of value and direction. Only then are they brought into contact with one another.

Abstract: The invention concerns a hydraulic steering arrangement (1) with an adjustable throttle, which has an internal rotary slide (2) with internal steering openings (4) in its circumferential wall and rotatable in relation to this, an external rotary slide (3) with external steering openings (7, 10) in its circumferential wall (8). The production of such steering arrangements must be inexpensive, yet a jamming during operation must be avoided. For this purpose, each of the external steering openings is made by a substantially radially extending bore (7), which penetrates part of the circumferential wall (8), and a following section (10) with reduced flow cross section.

Abstract: A hydraulic steering device is disclosed, having a housing in which an inner control slider and an outer control slider are arranged so that they are rotatable relative to one another and which together are arranged as alterable flow path means between a supply connection arrangement and a working connection arrangement. In such a steering device it is desirable to produce a remote control facility of simple construction. To that end, each control slider is connected to a driving slider, and between the two driving sliders there is created at least one pressure chamber which is acted upon by fluid under pressure, and a change in volume of the pressure chamber effects a relative displacement of the two control sliders.

Abstract: The invention concerns a compact drive with an electric motor, a frequency converter and a gear. Such a drive should be made in the most compact way possible. For this purpose frequency converter is arranged at one front end of the motor and the gear is arranged at the other front end of the motor.

Abstract: A hydraulic valve with a housing, having an inlet connection and an outlet connection with a hollow space between them, in which a valve slide is arranged to reciprocate, and, depending on its position, sets a flow cross section between the inlet connection and the outlet connection more or less free. In such a valve it is intended to improve the operational behaviour, that is, on the one hand to prevent a jamming and on the other hand to keep the leakage small. For this purpose, the valve slide is surrounded by a bush, which is arranged to be radially expandable in the hollow space.

Abstract: In a process for regulating a refrigeration system (1) using an expansion valve (4), one side of the regulating member is pressed by the pressure of refrigerant at the evaporator side and the other side of the regulating member is pressed by the vapor pressure of a sensor system (22) whose sensor temperature is determined by the refrigerant saturation temperature and by the heat supplied by a heating element (27). heat supply is regulated depending on a measurement value (overheating or liquid level). Also disclosed is a refrigeration system (1) regulated in this manner and an expansion valve (4) as essential component of such a system. An improved, exonomic and universally applicable regulation can thus be obtained.

Abstract: The invention concerns a hydraulic motor (1) having at least one gearwheel set section (2), a supply section (3) and a front section (4) on which an output arrangement (15) can be fixed, the sections (2 to 4) being connected with each other in the axial direction by fixing bolts (11).It is desired to simplify the production and the service during operation for such a motor.For this purpose several bores (17) are provided, which penetrate the motor (1,) from one axial end (21) to the other, in which connection bolts (6) are arranged, which are provided with an engagement area (18) on the side of the front section (4).

Abstract: The invention concerns a mass flowmeter for measurement of the mass and the density of a fluid flowing through a measuring pipe. The mass flowmeter uses the Coriolis principle for establishing mass and density. The mass flowmeter comprises at least one, preferably two, measuring pipes. Each measuring pipe is provided with an oscillation generator and a first oscillation detector and a second oscillation detector. The oscillation generator is meant for making the measuring pipes oscillate, and the oscillation detectors are meant for detecting oscillations in the measuring pipes when fluid flows through the measuring pipes. The oscillation detectors consist of armatures in the form of bar magnets extending into a ring coil. The coil is provided with a first winding and a second winding which are connected in series, and which are arranged at a distance from one another along a longitudinal axis.

Abstract: The invention concerns a method for controlling the temperature of a refrigeration unit (1) with a refrigerating compartment (3), a freezing compartment (2) and a common evaporator (4) of a cooling circuit, and a corresponding temperature control arrangement. In a first mode (normal operation) the compressor (5) of the cooling circuit is turned ON when cooling is required and turned OFF when cooling is not required, in dependence of the refrigerating compartment temperature (T.sub.2). In a second mode, in spite of no cooling requirement in the refrigerating compartment (3), the compressor (5) is forced ON for a predetermined operating time (t.sub.1), when the OFF-time of the compressor has exceeded a threshold value (t.sub.2). The forced turning ON is repeated as often as the OFF-time exceeds the threshold value. A return to the first mode occurs as soon as the refrigerating compartment (3) requires cooling.

Abstract: The invention concerns a method for speed control of a compressor, particularly a refrigeration compressor, and a control arrangement using this method. The speed control is effected in that a control arrangement varies the speed of an electric motor in dependence of simple ON/OFF signals from a thermostat placed in the surroundings to be cooled. The method according to the invention is characterized in that the starting speed of the compressor in a following ON period is reduced in relation to the final speed in the previous ON period. A continuous reduction of the starting speed of each ON period results in a self-regulating control giving long compressor operation times and an averagely low speed resulting in energy savings. A control arrangement using this method is also described.

Abstract: A hydrostatic steering device having substantially identical first and second steering systems, each including a pump connected to a steering unit, which is connected to a steering motor by two motor hoses. A steering wheel is common to both steering units. The device includes a change-over valve which has an operation position hydraulically coupling together the two motor hoses of the second steering system, while hydraulically isolating from each other the two motor hoses of the first steering system, and an emergency position hydraulically coupling together the two motor hoses of the first steering system, while hydraulically isolating from each other the two motor hoses of the second steering system. A switching device switches the change-over valve from the operation position to the emergency position, when a fault occurs in the first steering system.

Abstract: An analysis apparatus (1) for carrying out chemical analyses is disclosed, having a base member (3) in which there is at least one channel (8, 9), and having at least one functional element (12) which is in fluid or gaseous connection with the channel. In such an apparatus, it is desirable to facilitate maintenance and increase flexibility. For that purpose, the functional element (12) is positioned on the outside of the base member (3) and is in connection with the channel (8, 9) by way of at least one interface opening (10, 11).

Abstract: A distributor, in particular for a chemical analysis arrangement, is disclosed, having at least two plate-like housing parts which lie against each other with respective contact faces, wherein in the contact face of at least one housing part there is provided at least one channel that is covered by the other housing part. In a distributor device of that kind it is desirable to be able to structure the channels as precisely as possible and for the channels to be well-sealed, and for the volume to correspond as accurately as possible to a predetermined value. To that end, in one of the two contact faces there is provided a recess for receiving a bonding agent, which recess is arranged adjacent to the channel and follows its course.

Abstract: An expansion valve having a valve element, which valve element co-operates with a valve seat arranged between a first port and a second port in a housing, and is movable by an operating device in one direction and by a restoring device in the opposite direction along the same axis relative to the valve seat. It is desirable to make the properties independent of the operating direction in which the refrigerant flows. For that purpose, the valve element is connected to a first pressure surface arrangement, which comprises first pressure surfaces of substantially equal size acting in opposite directions, on which the pressure in the first port acts when the valve is closed, and to a second pressure surface arrangement, which comprises second pressure surfaces of substantially equal size acting in opposite directions, on which the pressure in the second port acts when the valve is closed.

Abstract: An end cover for protecting heat exchanger tubing of a condenser or an evaporator. The end cover comprises a cover support and a series of flanges extending from the cover support. The flanges are connected so that they can be bent relative to one another and the cover support in order to extend over and protect one end of the heat exchanger tubing. Similar end covers are provided for each end of the heat exchanger tubing.

Abstract: Power module for a current converter, particularly a frequency converter, having at least one printed circuit board equipped at least with power components and having a heat-conducting connection with a wall of the current converter housing serving as heat sink, the power module having electrically conducting connection parts arranged vertically to the housing wall, which parts laterally confine a chamber and are long enough to enable accommodation of large, passive electrical components, such as capacitors, in the chamber. To ensure a space saving embodiment of the power module, though maintaining a sufficient heat dissipation and simplifying the electrical connection between the power module and the remaining components of the converter, it is provided that the only electrical connection between the power module and other electrical components of the converter as well as to the supply mains and to a load supplied via the converter is established via the connection parts.

Abstract: A protective impedance for a mains voltage supplied electronic circuit has ohmic resistors which are applied to a substrate as film. At least two resistors form a series connection. At least two series connections are connected in parallel. This permits relatively large operating currents with relatively short series connections.

Abstract: The invention concerns a method for calibration of an analysis system (1) having a diaphragm (2), the outside of which is immersed into a medium (3) to be analyzed, and on the inside of which a carrier fluid (9) for the admission of a species penetrating the diaphragm (2) is flowing. On this system a calibration in situ should be possible, without causing high costs for constructional measures. For this purpose, the carrier fluid is, in a calibration step, retained on the inside of the diaphragm (2) for a predetermined sojourn time, and then the load of species in the carrier fluid (9) is determined. In a further calibration step, the carrier fluid is led past the diaphragm at a speed also used for measurements, and the load of species in the carrier fluid is measured. Then the penetration behavior of the diaphragm is determined on the basis of both load values.

Abstract: Hydraulic vane machine with a rotor having several radially movable vanes, and with a stator having a stator bore, in which the rotor is arranged rotatably, and whose internal wall is made as a guiding contour on which the vanes bear, and with a sideplate arrangement on each axial front side of rotor and stator, which define the vane cells together with the rotor, the vanes and the stator. In such a machine an improvement of the operation behaviour is desired. For this purpose, the sideplate arrangements are fixed on the rotor and rotate together with the rotor in relation to the stator.