CN2336244Y - Air return preventing device for ventilating duct - Google Patents

Abstract

The utility model relates to an air return preventing device for a ventilating pipe of a fume exhauster. The utility model comprises a wind baffle plate 3, a pin seat 5 and a pin shaft hole 4, wherein the pin seat 5 and the pin shaft hole 4 are arranged in the wind baffle plate 3, and the wind baffle plate 3 is fixed on a wind outlet 6 of a ventilating pipe 1 after the pin shaft 2 passes through one side of the ventilating pipe 1, the pin shaft hole 4, the pin seat 5 and the other side of the ventilating pipe 1. The utility model has the advantages that air return phenomena can be effectively prevented, the fume exhauster can conveniently exhaust, etc.

Description

Ventilation duct anti-air-return device

The utility model relates to a kind of ventilation duct anti-air-return device, particularly a kind of range hood ventilation duct anti-air-return device.

At present, employed range hood between family kitchen, the air outlet of the ventilation duct of installing on it generally all leads to outdoor, when range hood is worked, by ventilation duct indoor greasy smell is discharged into outdoor, to purify the air of a room.The employed ventilation duct of above-mentioned range hood is telescopic plastic flexible pipe or aluminium alloy light wall pipe, this pipe is when reality is used, and when there was wind in the external world, the return air phenomenon can appear in ventilation duct, promptly Wai Jie wind can pour in down a chimney in the inlet pipe road, makes indoor oil smoke smell be difficult to be discharged into outdoor.At present, a kind of ventilation duct is arranged on the market, the wind bar is transferred in the hard work that similar shutter is installed at its air outlet place, be beneficial to alleviate the return air phenomenon, but when extraneous wind-force during, transfer the wind bar to close easily and stop up air outlet, make indoor greasy smell be difficult to discharge outdoor greater than ventilation duct exhaust wind-force.

The purpose of this utility model is that a kind of ventilation duct anti-air-return device that can effectively prevent the return air phenomenon, be convenient to the range hood exhaust will be provided.

The purpose of this utility model is achieved like this, a kind of ventilation duct anti-air-return device, it comprises deep bead 3, is located at after key seat 5, pin shaft hole 4, bearing pin 2 on the deep bead 3 passes the opposite side of a side, pin shaft hole 4, key seat 5, ventilation duct 1 of ventilation duct 1 deep bead 3 to be fixed on the air outlet 6 of ventilation duct 1.

Below in conjunction with accompanying drawing the utility model is further described below.

Fig. 1 is the perspective view of each parts of the present utility model.

Fig. 2 is a structure diagram of the present utility model.

One end of deep bead 3 of the present utility model is oval or circular.Deep bead 3 can adopt plastics or metal material to be made, and offers a pin shaft hole 4 in the centre of deep bead 3, and the certain spacing of being separated by on it is provided with some key seats 5, and the effect of key seat 5 is that bearing pin 2 is fixed in the pin shaft hole 4.

The utility model is offered porose on the upper and lower axial symmetry face of the air outlet 6 of ventilation duct 1 respectively.When deep bead 3 when mounted, at first oval or a circular end are put into air outlet 6, then bearing pin 2 is begun from the hole on the last axial plane to insert downwards, pass from descending in the hole on the axial plane after passing through pin shaft hole 4, key seat 5 successively, deep bead 3 is fixed on the air outlet 6 of ventilation duct 1, and guarantees that deep bead 3 can be around bearing pin 2 rotations.

The utility model is when being subjected to extraneous windage, at first being assumed to be positive direction the wind comes from, at this moment an end face in deep bead 3 outsides is stressed moves backward, drive bearing pin 2 rotations, the ellipse of deep bead 3 inboards or circular end surface are moved forward with the inwall of ventilation duct 1 fits, extraneous wind-force is blocked in the outside of ventilation duct 1 fully, and exhaust outlet 7 places of air outlet 6 belows that the oil smoke of range hood discharging then can be by ventilation duct 1 discharge, and are not subjected to the influence of extraneous wind-force size.Otherwise when being subjected to opposite direction wind-force, just the direction of deep bead 3 rotations is opposite, and its principle is identical with said process.

The utility model is owing to after adopting said structure, can effectively stop the return air phenomenon of ventilation duct 1, and mist extractor is effective, can be widely used in use in the kitchen in family, dining room, restaurant, hotel.

Claims (2)

1, a kind of ventilation duct anti-air-return device, it is characterized in that it comprises deep bead (3), be located at key seat (5), pin shaft hole (4) on the deep bead (3), bearing pin (2) is fixed on deep bead (3) on the air outlet (6) of ventilation duct (1) after passing the opposite side of a side, pin shaft hole (4), key seat (5), ventilation duct (1) of ventilation duct (1).

2, ventilation duct anti-air-return device according to claim 1, an end that it is characterized in that deep bead (3) is for oval or circular.

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