摘要:
An efficient axial fan (1) has housing (2) with a square inlet opening (3) and a round outlet opening (3"), a fan assembly with a drive motor (10) and a propeller (26p) coupled thereto. The entrance of the housing is provided with a self opening shutter assembly (4) disposed horizontally or vertically across the entrance of the fan and comprising a plurality of vanes (5) including a central operative vane (5c) operated by a centrifugal shutter mechanism (17) secured to one end of the propeller shaft (14), opposite to the propeller (26p) and adjacent to the operative central vane (5c) of the shutter assembly (4). The centrifugal shutter mechanism (17)is normally provided with a hermetic housing (18) comprising a pair of radial masses (22) operatively connected by means of a pair of pivoting arms (23) to an axial sliding reciprocating actuator (24) which is disposed adjacent to the shutter central operative vane (5c). When the fan (1) is on, the radial masses (22) by centrifugal action rotate the pair of arms (23) which push the axial sliding reciprocating actuator (24) away from the central operative vane (5c) allowing an extension spring (7s) associated with the shutter assembly (4) to cause the opening ofthe vanes 5 and 5c. When the fan (1) is off, an internal compression spring (25) housed within the axial sliding actuator (24) pushes it against the central operative vane (5c) causing the closing of the shutter (4). The propeller (26p) comprises a plurality of radially disposed blades (26) which are entirely surrounded by a Venturi (28) and are provided with radially slidably adjustable shoes (26s) for adjusting the tip blade clearance with the Venturi (28).
摘要:
The device comprises a control organ (4) slidingly mounted on a shaft (6) able to be actuated in rotation by a motor of a ventilator. The control organ (4) rigidly bears a fan (2) and is movable in contrast to a helical spring (18) by effect of an axial thrust produced by the functioning fan. The translation of the control organ (4) between a first and a second operative position causes, through a transmission kinematic mechanism (12), an air lock (2a) of the ventilator to switch from a closed condition to an open condition. A bell element (14) and an extensible protecting shroud (20) safeguard the components of the device against the entry of dust and against the action of atmospheric agents.
摘要:
A modular element (1, 14, 18, 101, 201) for the composition of blackout panels with airflow passage, comprises a substantially flat plate (3, 103, 203); first fins (5, 105, 205) protruding by one free edge from at least one face of the plate to define open channels (2) between them and with opposing ends facing onto opposing lateral edges of the plate (3, 103, 203); connecting means (4, 7, 104, 107, 204, 207) designed to permit the assembly of the element (1, 14, 18, 101, 201) with other elements to form a blackout panel having on opposing faces the extreme opposites of the channels and the plates of the elements disposed crosswise to its extension. A panel is obtained by assembling a plurality of elements (1, 14, 18, 101, 201), the elements being disposed close together in a row so as to have the plates (3, 103, 203) parallel to one another, each plate (3, 103, 203) constituting a closure for the channels (2) of an adjacent element to form ducts (15) with open ends on opposing faces of the panel for the passage of air between such opposing faces of the panel.
摘要:
Bei einem Wärmetauscher, insbesonere bei einem Kühlgerät, mit einem Gehäuse und wenigstens einem Ventilator zum Ausblasen der durch den Wärmeaustauscher strömenden Luft durch eine Austrittsöffnung des Gehäuses, wird zur Vermeidung von Energieverlusten bei einem Abtauvorgang und zur Einsparung von Energiekosten auf der Ausßenseite der Austrittsöffnung (4) des Gehäuses (1) eine flexibles Flächenstück (6,15) angebracht, das bei laufendem Ventilator die gekühlte Luft ungestört in den umgebenden Raum austreten läßt, bei abgeschaltetem Ventilator aber in sich zusammenfällt und dadurch die Austrittsöffnung des Gehäuses abdeckt, so daß beim Abtauvorgang keine feuchtwarme Abtauluft durch die Austrittsöffnung des Gehäuses in die Umgebung austreten kann.
摘要:
A centrifugal device (17), in particular for operating shutters (20) disposed facing a fan (15), comprises a first end plate (23) connected to the end of a shaft (16) for rotating the fan (15). Facing said first plate (23) is a second end plate (24) rotatingly supporting, on an axis substantially coinciding with the shaft (16), a fastening element (19) for a control rod (18) which operates the mechanism when the two plates move away from and towards each other. The plates being linked to each other by at least three centrally articulated arms (26, 27) provided with counterweights (29) close to the central joint (28), on rotation of the shaft the centrifugal force acting on the counterweights (29) causing the central joints (28) to move apart from each other.
摘要:
A shutter mechanism for a ventilation fan comprises a number of blades (1,2,16) forming a louvre shutter or an iris shutter, which blades are movable between closed and open positions by a linear or rotary actuator (3,17,18). The actuator includes a spring (14) which urges the blades into the closed position. A synchronous motor (6,21), when energised, causes the actuator to open the blades and to maintain them open against the action of the spring. In the open position of the blades, the motor operates in the stalled condition, and can operate in that condition for indefinite periods of time.
摘要:
A powered, direct discharge ventilator comprises an extraction fan (K) having a fan duct (12) and a self weathering, non-return shutter plate (P) for closing the exit from the extraction fan duct (12) when the ventilator is not operating. The shutter plate (12) is guided by rods (21) to be opened by the airstream when the fan (K) is started, whilst maintaining a position generally parallel to that which it occupies in its fan duct closing position and to be closed by springs (23) when the fan (K) is stopped. The fan (K) mounts a centrifugally operable latch (30), co-incident with its rotational axis (C), and the shutter plate (P) carries a catch (31) to be engaged by the latch (30) when the shutter plate (P) is closed, the catch then preventing lifting of the shutter plate (P) due to "wind-over" effect when the fan (K) is stationary. When the fan (K) is started, the catch (30) is centrifugally operated to release the catch (31) to allow the shutter plate (P) to open.
摘要:
A manufacturing method and assembly for providing ventilation to a selected structure is disclosed. The assembly may include various features such as flexible portions, rigid portions, and assembly portions. Further, various steps may be used to form the assembly to achieve selected results, such as single piece formation, inclusion of various positioning members, and packaging or shipping considerations.