Fire damper for ventilating fan

Abstract

A fire damper for a ventilating fan includes a shutter and a frame provided with a flange. An opening is defined through the flange. The frame is further provided with a movable component for opening or closing the preformed opening.

Claims

1. A fire damper and ventilating fan assembly, the ventilating fan comprising a power cord, and the fire damper comprising a shutter and a frame provided with an interior flange, wherein an opening is defined through the interior flange, and the frame is further provided with an interiorly mounted movable component, wherein said movable component includes a through groove, an elongated screw hole adjacent the through groove, and a block portion at a lower section of the movable component that extends along a length direction of said elongated screw hole; wherein said movable component is configured to move between a first position and a second position, wherein in the first position the power cord is inserted into the opening and is passed along a passageway formed by the opening through the interior flange and the movable component through groove, and, in the second position the power cord is not inserted into the opening, and the opening is occluded by the movable component to prevent access to the opening; wherein when the movable component is in the second position, the opening is occluded by the block portion; wherein when the movable component is in the first position, the through groove is constituted as a part of the passageway and the power cord is passed through the through groove; and wherein the movable component is a single piece, and is attached to the frame in both the first position and the second position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention may be understood and its features made apparent to those skilled in the art by referencing the accompanying drawings.

(2) FIGS. 1A, 1B are schematic views of a fire damper for a ventilating fan in the prior art;

(3) FIGS. 2A, 2B are schematic views of a fire damper for a ventilating fan according to a first embodiment of the present invention;

(4) FIG. 3 is a schematic view of a movable component in the fire damper according to the first embodiment of the present invention;

(5) FIG. 4 is a schematic view of the fire damper having no preformed openings, according to the first embodiment of the present invention;

(6) FIG. 5 is a schematic view of the fire damper having a preformed opening according to a second embodiment of the present invention;

(7) FIG. 6 is a schematic view of a movable component in the fire damper according to the second embodiment of the present invention; and

(8) FIG. 7 is a schematic view of the fire damper having no preformed openings, according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

(9) In the following description, numerous specific details are set forth to provide a more thorough description of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without these specific details. In other instances, well-known features have not been described in detail so as not to obscure the invention.

(10) FIGS. 2A, 2B are schematic views of a fire damper having preformed openings according to a first embodiment of the present invention. As shown in the figures, the fire damper 200 for a ventilating fan 100 comprises a shutter (no shown in these figures) and a frame 230 provided with a flange 220. The frame 230 is divided into an upper frame section 231 and a lower frame section 232. The frame 230 has a square configuration. The flange 220 is located at an inner periphery where the upper and lower frame sections meet each other. The flange 220 is sandwiched by the frame 230. The shutter (no shown in these figures) is located in a space enclosed by the flange 220.

(11) The preformed openings 301 and 302 are provided on the upper frame section 231 and the lower frame section 232 of the frame, respectively. The preformed openings 301 and 302 are provided in a paired configuration. The preformed means that the openings are not cut out completely, specifically, the openings are in an incomplete cut-out status and have pinhole line (a line with perforations) configurations.

(12) FIG. 3 is a schematic view of a movable component in the fire damper according to the first embodiment of the present invention. As shown in FIGS. 3, 2B, the movable component 400 is an integral component, which has clip members 410 provided at one end thereof and a first screw hole 420 formed at the other end thereof. The clip members 410 are caught or engaged at the lower end 232 of the frame 230. The movable component 400 is fixed to the frame 230 by passing screw through the first screw hole 420. A prolonged protruded groove 430 is provided at the middle of the movable component 400. An edge portion 440 is provided at one side, in a location corresponding to the preformed openings 301 and 302, of the protruded groove 430. Width of the edge portion 440 is slightly greater than that of the preformed openings 301 and 302. The first screw hole 420 and the edge portion 440 are located at both sides of the protruded groove 430, respectively. Further, as shown in FIG. 2B, a second screw hole 421 is provided on the edge portion 440 at a location away from that of the preformed opening 302. The second screw hole 421 is used for strengthening the mounting of the movable component 400 on the frame 230.

(13) As shown in FIGS. 2A, 2B and 3, with the above-mentioned structure, once a mask with a sensor or an illumination is adopted in the ventilating fan 100, passageway is formed by only forming the preformed openings 301 and 302 along the pinhole line. Then, a power cord 330 with a sensor or an illumination is passed through the preformed openings 301 and 302, which are formerly broken through. The passageway presented by forming the preformed openings 301 and 302 of the frame 230 is filled with the power cord 330. And, the power cord 330 is fixed by the movable component 400 to the fire damper frame. Here, the power cord 330 located between the preformed openings 301 and 302 is encircled by the prolonged protruded groove 430, such that, the passageway presented by forming the preformed openings 301 and 302 is completely closed down. When the shutter of the fire damper 200 is closed (no shown in these figures), the air inlet of the ventilating fan 100 is completely isolated from the indoor. That is, the ventilating fan 100 is prevented to inhale the air in the indoor.

(14) FIG. 4 is a schematic view of the fire damper having no preformed openings according to the first embodiment of the present invention. As shown in FIGS. 4 and 3, once a mask with a sensor or an illumination is not adopted in the ventilating fan 100, the preformed openings 301 and 302 may not be formed. However, if the preformed openings 301 and 302 are formed, the protruded groove 430 of the movable component 400 may offset from locations of the preformed openings 301 and 302 such that the edge portion 440 is over against locations of the preformed openings 301 and 302, thereby blocking the passageway, which is presented by forming the preformed openings 301 and 302, by the edge portion 440. Here, the second screw hole 421 is located between the preformed openings 301 and 302. Then, the movable component 400 is fixed to the frame 230 by passing the screw through the first screw hole 420 and the second screw hole 421 on the movable component 400. When the shutter of the fire damper 200 is closed (not shown in these figures), the air inlet of the ventilating fan 100 is completely isolated from the indoor. That is, the ventilating fan 100 is prevented to inhale the air in the indoor.

(15) In this embodiment of the present invention, the object of that width of the edge portion 440 is slightly greater than that of the preformed openings 301 and 302 is to facilitate the edge portion 440 to block the preformed openings 301 and 302. However, the present invention is not limited to adopt the edge portion 440 has a width slightly greater than or equal to the preformed openings 301 and 302.

(16) The movable component 400 according to the present invention may use two screw holes, instead of the prolonged screw hole. In addition, according to the present invention, the corresponding screw hole may not be provided on the frame, because, normally, with a certain external force, the screw can penetrate directly through the frame of metal sheet.

(17) FIG. 5 is a schematic view of the fire damper having a preformed opening according to a second embodiment of the present invention. FIG. 6 is a schematic view of a movable component in the fire damper according to the second embodiment of the present invention. As shown in FIG. 5 and FIG. 6, different from those in the first embodiment, the preformed opening 303 is formed in the flange 220 of the frame 230. The movable component 500 is an integral forming one, which has a through groove 510 configured for passing through the power cord. A prolonged screw hole 520 is formed at one side of the through groove 510. A block portion 530 is provided at the lower section of the prolonged screw hole 520 along a length direction of the prolonged screw hole 520. Size of the block portion 530 is greater than that of the preformed opening 303.

(18) With the above-mentioned structure, once a mask with a sensor or an illumination is adopted in the ventilating fan 100, passageway is presented by only forming the preformed opening 303 of the flange 220 of the frame along the pinhole line. Then, a power cord 330 with a sensor or an illumination is passed through the preformed opening 303. The passageway formed by the preformed opening 303, which is formerly broken through, of the flange 220 of the frame is filled with the power cord 330. And, the power cord 330 is fixed by the through groove 510 of the movable component 500 to the frame 230. Here, the passageway presented by forming the preformed opening 303 is completely closed down. When the shutter of the fire damper 200 is closed (no shown in these figures), the air inlet of the ventilating fan 100 is completely isolated from the indoor. That is, the ventilating fan 100 is prevented to inhale the air in the indoor.

(19) FIG. 7 is a schematic view of the fire damper having no preformed openings according to the second embodiment of the present invention. As shown in FIG. 7 and FIG. 6, once a mask with a sensor or an illumination is not adopted in the ventilating fan 100, the preformed opening 303 may not be formed. However, if the preformed opening 303 are formed, the through groove 510 of the movable component 500 may offset from location of the preformed opening 303 such that the block portion 530 is over against location of the preformed opening 303, thereby blocking the passageway, which is presented by forming the preformed opening 303. Then, the movable component 500 is fixed to the frame 230 by passing the screw through the prolonged screw hole 520 of the movable component 500. When the shutter of the fire damper 200 is closed (not shown in these figures), the air inlet of the ventilating fan 100 is completely isolated from the indoor. That is, the ventilating fan 100 is prevented to inhale the air in the indoor.

(20) In this embodiment of the present invention, the object of that length and width of the block portion 530 is slightly greater than those of the preformed opening 303 is to facilitate the block portion 530 to block the preformed opening 303. However, the present invention is not limited to adopt the block portion 530 has a size slightly greater than or equal to the preformed opening 303.

(21) In addition, the through groove 510 of the movable component 500 partly may act as a locating piece of the shutter, that is, a section into which the shutter will run during the closing. The through groove 510 exists, whether the preformed opening is adopted or not.

(22) Although several exemplary embodiments have been shown and described, it would be appreciated by those skilled in the art that various changes or modifications may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.