Abstract: A controlled dilution fluid flow pattern is described. In an embodiment, a fluid supply device is configured for controlling a pattern of a flow of a fluid within a critical room. The critical room comprises a critical area subject to contamination. A first fluid supply nozzle is configured to provide a first fluid supply jet to provide a first flow of the fluid towards a substantial center of the critical area. A second fluid nozzle is configured to provide a second fluid supply jet to provide a second flow of the fluid towards a perimeter of the room. A momentum of the first fluid supply jet and a momentum of the second fluid supply jet are adjusted so that the substantial center of the critical area is flushed by the first flow and penetration of the second flow into the substantial center of the critical area is generally prevented. In other embodiments, a HVAC system and method are discussed along with the features of the device.

Abstract: An adapter structure of a ventilating fan includes an oval metal adapter and an oval metal shutter provided in the metal adapter having a shape corresponding to the oval metal adapter. A symmetry axis of a longitudinal cross-section of the oval metal shutter in the horizontal direction is a major axis, and a symmetry axis in the vertical direction is a minor axis. The shutter rotates through a rotating shaft in the metal adapter, a curve point is provided between a projection point of a center line of the rotating shaft on the minor axis and a tail of the shutter a curved portion of the shutter is formed by curving the shutter from the curve point to an inner surface side of the shutter along the minor axis. Vibration of the shutter is suppressed in a position where the shutter is opened and turbulent flow is prevented.

Abstract: An illustrative damper system includes a damper blade that is configured to be positioned within a duct, such as a bypass duct of an HVAC system. A shaft is in communication with the damper blade, and an actuator or force adjustment mechanism is in communication with the shaft. The actuator or force adjustment mechanism may include a housing and a spring therein, where the spring is in communication with the shaft. The shaft, the damper blade, and the spring may be configured such that the shaft may affect movement of the damper blade about a rotation axis offset from a diametrical axis of the damper blade.

Abstract: An adjustable orifice for use in an aircraft air conditioning system includes a first orifice element which has an orifice frame as well as a first orifice area. When the orifice is assembled at a duct, the first orifice area of the first orifice element leaves open a part of a cross section of the duct. The orifice also includes a second orifice element with a second orifice area. When the orifice is assembled at the duct, the second orifice area of the second orifice element leaves open a part of the cross section of the duct. The second orifice element is rotatable about an axis, so that the second orifice area is rotatable relative to the first orifice area in order to set a desired flow cross section in the duct.

Abstract: A bushing is disclosed for pivotally mounting a damper in ductwork of the type generally used with heating, ventilation, and air conditioning (HVAC) systems. The bushing is a circular shaped member of silicone rubber material, which is particularly configured and dimensioned to provide an airtight fit with the ductwork to prevent loss of conditioned air at the pivot location, without compromising the rotational capability of the damper to alter the direction of the conditioned air. The bushing is dimensioned to be inserted into the ductwork and includes a peripheral groove which receives the ductwork in a manner which compresses the inner surface of the groove to provide the airtight seal. The bushing also includes a longitudinally tapered square central opening, which opening is dimensioned to engageably receive the damper pivot rod snugly to provide additional sealing at the interface between the bushing and the pivot rod.

Abstract: Systems and methods for a vent are described herein. In some embodiments, a vent may be configured to be positioned in an opening in a surface. The vent may include flexible members configured to inhibit extraction of the vent from the opening once positioned in the opening. The vent may include at least one vane. The vanes may rotate such that, during use, the vanes function to control the direction of fluids conveyed through the vent. In some embodiments, vane(s) may include at least one anti-uncoupling device on a vane to prevent overly exerted forces applied onto the vane by a vent operator from uncoupling the vane from its mating frame axle.

Abstract: A damper plate assembly adapted for installation in a circular air duct having tubular walls defining a bore about a central air flow axis with a set of coaxial apertures in opposing walls, the damper plate assembly including: a. a disk-like damper plate having (i) a central body part with a peripheral edge region, and a set of first and second holes extending transversely through the damper plate and situated along a diametrical line 180 degrees apart in first and second opposite portions respectively of the peripheral edge region, and (ii) a finger-like projection extending in the plane of the disk radially outward of the first peripheral edge region along the diametrical line, and b.

Abstract: The invention relates to a louver roller (100) with louver members and mounting in an air nozzle body. In order firstly to ensure rapid installation of the louver members in the louver roller (100) and secondly to provide a secure fastening of the same, the invention proposes that snap-in segments (12) are arranged between end sides (10, 11) of the louver roller (100) and each have, on the louver-member side, a recess (14) into which the louver members can be snapped in a frictional and/or form-fitting manner.

Abstract: In a refrigerator temperature controlling apparatus and method thereof adopting GA-fuzzy inference, the refrigerator includes a cool air passage formed at both sides of the rear surface of a housing for guiding downward the cool air passing through a guide passage, a cool air discharging adjustment blade rotatably installed in front of the housing for dispersing and concentrating the cool air produced from discharging apertures, a driving motor for driving the cool air discharging adjustment blade, and a controller with each temperature sensors in left right side walls, for comparing the temperature inferred by the GA-fuzzy inference with data learned by reference to control the cool air discharging direction. Therefore, the cooling speed becomes fast and the temperature distribution depending on the refrigerated foodstuffs is made uniform throughout the refrigeration compartment. Also, the incoming external temperature due to door openings can be compensated for.

Abstract: A method of and a device for magnetic-abrasive machining of parts has an external magnetic field providing a magnetic flux, a supply of a magnetic-abrasive powder to the part in the magnetic field. The part is rotated and oscillated about the longitudinal axis so that magnetic-abrasive powder is displaced by the rotating part in a circumferential direction. A fluid jet is directed toward the magnetic-abrasive powder so as to press the magnetic-abrasive powder against a surface of the part. The fluid jet is to improve the material removal rate of machining.

Abstract: A shaft extends across an air discharge opening and is rotatably mounted therein. A drive means is operatively connected to the shaft for rotating the shaft on its axis. A plurality of planar discs, are eccentrically mounted on the shaft. A pair of adjacent louver blades extending across the air discharge opening are pivotally mounted at their one edge in the air discharge opening. A spring is connected to the louver blades for biasing then into an engaging relationship with the discs such that, as the discs rotate, the louver blades are caused to rotate on their axes to cause a change in the direction of airflow emanating from the discharge opening.

Abstract: A circulation air distributing system for supplying fresh conditioned, hot or cold air through the use of cells metal cellular flooring. Distribution box inserts are uniformly distributed along the cellular flooring units prior to concrete placement. Selected distribution box inserts are activated to provide individual control means including diffuser means, for supplying individual workstations with fresh air at the volume, the temperature, and in the direction desired by the occupant. Air movement is from the floor surface upwardly toward the ceiling and into a return plenum space provided above the ceiling structure. In the event of a fire, selected diffuser means may be replaced by mask assembly which provide fresh, breathable air to an individual. Signal means activated on connection of the mask assembly to the control means, alerts the fireman as to the location where rescue is required.

Abstract: An air conditioning outlet and inlet grill for installation in static structures comprising a plurality of modular grill units and apparatus for interconnecting the plurality of modular grill units in a desired grid arrangement.