JPS644026Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is a ventilation fan of the type that is installed by being inserted into a duct, in which a shutter for opening and closing an opening in a cylindrical casing of the ventilation fan is formed of a plurality of shutter plates.

Conventionally, in this type of ventilation fan, the shutter for opening and closing the opening of the cylindrical casing is formed of a single plate, as described in Japanese Utility Model Publication No. 1226/1983, and therefore, when the shutter is opened, the free end of the shutter is It protrudes larger than the shaped casing, requires a wider space outward than the shutter, and is limited by the duct in which the ventilation fan can be installed.The shutter is also heavy and requires a strong wind speed to open, requiring a larger motor. Furthermore, it was unavoidable that the controllable range of wind speed would become narrower.

This was made in view of the points related to the present invention, and one embodiment will be described below with reference to the drawings.

Reference numeral 1 denotes a cylindrical casing of the ventilation fan body, and the opening edge on the indoor side is covered with a lattice-shaped casing or the like that covers the front opening of the ventilation duct 2 through an integrally formed outward facing collar or as in the embodiment. Mounted and supported on the louver 3 with screws 4 etc., and near the indoor opening edge,
An orifice 5 is formed that projects inward. 6
is a fan motor mounted in the casing 1 via a mounting leg 8 fixed with a screw 7; a fan 11 is mounted on its rotating shaft 9 with a nut 10; It is made to face.

Reference numeral 12 denotes a spring plate attached to the outside of the casing 1 by the screw 7 that fixes the mounting leg 8 of the motor 6, and the spring plate is curved at the center to form an elastic part 13 that presses against the inner surface of the ventilation duct 2. The casing 1 is removably held at a fixed position within the ventilation duct 2 by arranging a plurality of similar configurations at intervals from each other.

The casing 1 has a rear opening provided with a plurality of shutter plates 14, 1 which are opened by the wind pressure of the fan 11.
5 are disposed vertically, with their respective upper parts rotatably supported by shafts 16 and 17, and the rear opening of the casing 1 is closed so as to be openable and closable. The upper shaft plate 14 is a substantially semicircular so-called kamaboko-shaped plate, and the shafts 16,
Penetrating portion 18, 1 that allows insertion of 17 in a rotatable manner
9 are formed by alternately cutting and recessing them back and forth. The lower shutter plate 15 has the same structure as the upper shutter plate 14, and has shafts 16,1.
Through-insertion parts 19, 18 through which 7 can be inserted rotatably
are formed with a space between them above and below. This lower shutter plate 15 has a circular arc portion connected to the casing 1.
The shaft 17 is inserted into the upper part of the insertion parts 19 and 18, and the shaft 17 is inserted into the insertion part 18 located at the lower free end. is not inserted. The upper shutter plate 14 has an arcuate portion located at the upper part along the inner circumferential surface of the casing 1, and the lower free end overlaps with the upper end of the lower shutter plate 15 with a gap in front of the upper end of the lower shutter plate 15 via a spacer 20, etc. The shaft 16 is pivotally supported by a penetration portion 18 provided in an arcuate portion located at the top. Reference numeral 21 denotes a buffer body on which the lower free end of the lower shutter plate 15 abuts and locks, and like the spacer 20, it is made of a suitable material such as rubber or foamed polyethylene, and when abutting the lower free end, the lower free end has a smaller clearance than the shaft 17. It is held at an angle so that it is positioned outward.

Although the upper and lower shutter plates 14 and 15 have been described as being different from each other, they have the same construction but are given different names depending on the arrangement in which the arcuate portions are located at the upper and lower parts of the casing 1, respectively. Therefore, if the upper shutter plate 14 is reversed or rotated 180 degrees and placed in the lower half of the opening of the casing 1, the lower shutter plate 15
becomes. Therefore, each penetrating portion is given the same reference numeral.

The present invention is constructed as described above, and since the opening of the cylindrical casing can be opened and closed using multiple shutter plates, the shutter plate does not protrude much beyond the casing, and the shutter plate can be opened and closed even at small wind speeds. The fan's wind speed control range is expanded. Moreover, the plurality of shutter plates may have the same configuration even though the casing is cylindrical, and the design and manufacture can be simplified and simplified without increasing the number of parts. In addition, the shaft penetrating portions formed at the upper and lower parts of the shutter plate reinforce the shutter plate, thereby preventing deformation due to opening and closing of the shutter plate.

[Brief explanation of the drawing]

FIG. 1 is a rear perspective view of the ventilating fan of the present invention, FIG. 2 is a schematic vertical cross-sectional view showing the state of use, FIG. 3 is a front view of the shutter plate, and FIG. 4 is a side view. 1... Cylindrical casing, 14, 15... Shaft plate, 16, 17... Shaft.

Claims (1)

[Scope of utility model registration request] A cylindrical casing that houses a fan motor,
A shaft installed on the upper and middle parts of the rear opening of the casing, and upper and lower shutter plates each consisting of a substantially semicircular plate body of the same configuration that opens and closes the rear opening of the casing and has shaft insertion parts at the upper and lower parts. A ventilation fan characterized in that the upper shutter plate has an arcuate portion at the top, and the lower shutter plate has the arcuate portion at the bottom, and is rotatably supported on the shaft.