Abstract: A method for mixing a pulverulent material in a main gas flow with a view to achieving uniform distribution of the pulverulent material. The turbulence in the main gas flow is increased in a vortex-generating zone. The pulverulent material is introduced into the main gas flow, in a mixing zone, with a carrier gas flow whose net motion during introduction is essentially opposite to the main gas flow. The mixing zone is positioned downstream of the vortex-generating zone and in the vicinity thereof. The carrier gas flow with the pulverulent material is in a rotational zone given a helical motion, whose axis of symmetry is essentially parallel with the direction of flow of the main gas flow, and is introduced into the mixing zone in the form of a divergent hollow cone. A device for carrying out the method comprises a gas duct (1) for the main gas flow with vortex-generating means (4) and an introducing means (11) for introduction of pulverulent material in dispersed state into a carrier gas flow.

Abstract: The invention relates to a method of introducing and removing workpieces, particularly vehicle bodies, into and out of a treatment area (20, 70) suitable for the surface treatment of the workpieces (1), wherein the workpieces (1) are detachably secured to mounting frames (7) that each have a rotary axis (13, 41, 61) aligned transverse to the direction of movement of the workpieces (1), the rotary axes (13, 41, 61) are continuously moved translationally and at a constant speed, and the workpieces (1) at the start and end of the treatment area (20, 70) are simultaneously rotated through about 180° around one of these rotary axes (13, 41, 61) in a controlled and always guided manner in the direction of the translational movement. The invention also relates to a device for the surface treatment of workpieces and a system for the surface treatment of vehicle bodies.

Abstract: An arrangement for supplying air to a room, preferably a clean room, which is divided into zones (A, B, C) with different climatic requirements, comprises a first air treatment unit (11) for supplying air to a pressure chamber (5) which is shared by a plurality of zones and from which air is supplied to the various zones. The arrangement also comprises at least one mixing spaced (14) communicating with the pressure chamber (5) and a second air treatment unit (17). The mixing spaced is intended for mixing of the air from the first (11) and the second (17) air treatment unit. The mixing space also communicates with at least one of the zones (B) for supplying the mixed air to this zone (B).

Abstract: Air-conditioning installation for room spaces (1), comprising a heat transfer device (4) for preheating supply air (A) by transferring heat from exhaust air (B) into the supply air; heating means including a heating source (11) for further heating the supply air; cooling means including a cooling source (14) for cooling the supply air; and adjusting means (16, 17, 18, 21, 32, 33, 34) for sensing the temperature of the supply air and for controlling the heat transfer device and the heating and cooling means on the basis of the sensed temperature. To simplify the structure of the installation, the heating and cooling sources (11, 14) are connected to the heat transfer device (4) so that the preheating, further heating and cooling of the supply air take place through the common heat transfer device.

Abstract: A guide vane arrangement for axial fans, intended to translate the rotational component of the gas flow velocity after passage through the impeller (1) into a substantially axial velocity, including a ring (2) of guide vanes disposed downstream of the fan and in spaced relationship therewith. Alternate guide vanes are axially displaced with respect to the remaining ones, so that alternate guide vanes are at a first axial distance from the fan and the remainder are at a second axial distance from the fan. As an alternative, alternate guide vanes have a portion of the end part facing towards the fan removed, so that the forward edge of alternate guide vanes is at a first distance from the fan and the remaining guide vanes are at a second axial distance, and the guide vanes are non-uniformly distributed along the periphery of the ring.

Abstract: An air supply housing arrangement for a paint spray booth is located at an elevation in the booth such that the air flowing through a booth paint spray zone is processed below a level of water held in a booth recirculation tank.

Abstract: A paint spray booth (40) having an air supply system for processing air is improved in that a housing arrangement (16) for the air supply system is located entirely within the paint spray booth (40).

Abstract: An arrangement for cleaning ventilation air coming from a paint spray booth and polluted with paint particles is provided with a liquid flow for separating part of the paint particles from the ventilation air and a wet electrostatic precipitator for separating any remaining paint particles and liquid droplets from the ventilation air. The electrostatic precipitator is located in an enclosure underneath the floor of the spray booth, with a surface of the enclosure being poured over with the liquid flow to remove part of the paint particles. The enclosure is further designed so that the ventilation air from the spray booth is caused to be deflected through an angle of 10.degree.-170.degree. in relation to the substantially vertical direction of flow through the spray booth before passing through the liquid flow and into the electrostatic precipitator.

Abstract: In a method for controlling the current pulse supply to the discharge electrodes of an electrostatic precipitator unit in order to achieve maximum separation of dust from gases conducted between the discharge electrodes and the collecting electrodes of the unit at issue, current pulses (I) with a given pulse current are supplied to the discharge electrodes. The pulse frequency is varied, and instantaneous values (U.sub.p, U(I=O), U(I=O+1.6)) corresponding to one another, for the voltage (U) between the discharge electrodes and the collecting electrodes are measured for a number of pulse frequencies. Then, the current pulse supply to the discharge electrodes is set to the pulse frequency at which the highest instantaneous value has been measured.