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Backflow prevention device for bathroom air duct




Title: Backflow prevention device for bathroom air duct.
Abstract: A backflow prevention device is connected to a bathroom air duct and includes a case having two opposite gas inlet-end opening and gas outlet-end opening; a gas inlet-end unit and a gas outlet-end unit respectively mounted to and communicating with the gas inlet-end opening and the gas outlet-end opening; and at least one backflow prevention unit mounted in the case. The backflow prevention unit includes a frame and a plurality of baffle plates pivotally mounted in the frame. The baffle plates are arranged in the frame from top to bottom to overlap with each other, and can be pivotally turned only in one way toward the gas outlet-end opening to an open position. Thus, gas in a bathroom is allowed to flow from the gas inlet-end opening to the gas outlet-end opening, while gas with bad odor in a public pipe shaft is prevented from flowing back into the bathroom. ...


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USPTO Applicaton #: #20100099348
Inventors: Jen-chi Wu, Shih-wei Wu


The Patent Description & Claims data below is from USPTO Patent Application 20100099348, Backflow prevention device for bathroom air duct.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number 97140022, filed Oct. 17, 2008, which is herein incorporated by reference.

FIELD OF THE INVENTION

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The present invention relates to a backflow prevention device, and more particularly to a backflow prevention device for bathroom air duct.

BACKGROUND

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OF THE INVENTION

Apartment dwellings and condominiums usually have bathrooms designed as spaces without any vent directly led to an outdoor environment. With the door thereof being shut, such a bathroom in use forms a closed space almost isolated from the external environment, and any hot air or biogas or other poisonous gases produced in the closed bathroom in use just could not be exhausted but diffuses into the living room, bedrooms or other spaces in the apartment. In some worse conditions, such biogas or poisonous gases would seriously affect the dwellers' health and safety.

To overcome this problem, an extraction fan is usually mounted to the ceiling of such bathroom having an almost closed space. The extraction fan is connected to an air duct that is led to a public pipe shaft in the apartment building and then to an external environment, such as the roof of the building. With the extraction fan, gases in the bathroom can be extracted to flow through the air duct and the public pipe shaft to be finally exhausted into ambient air.

That is, all the bathrooms at different floors in the same apartment building communicate with the public pipe shaft via the bathroom extraction fans and the air ducts connected thereto, so that the gases produced in the bathrooms at all floors of the apartment building are exhausted into external environment via the same public pipe shaft. This also means that the public pipe shaft, the air ducts connecting the bathroom extraction fans to the public pipe shaft, and the bathrooms in the same apartment building together form a network of mutually communicable ventilation spaces.

The gases produced by the bathrooms of all dwellers in the apartment building and collected in the public pipe shaft frequently emit bad odors, which tend to flow from the public pipe shaft back to the bathrooms at different floors of the apartment building. That is, when the bathroom extraction fans are not in operation, air in the public pipe shaft carrying the bad odor gases can very easily invade into the bathrooms via the air ducts to largely reduce the dwellers' living quality or even bring hazards to the dwellers' physical and mental health. Such undesirable condition is particularly serious in windy days when strong wind blows down into the public pipe shaft from the roof of the building. The bad odors will quickly flow back through the air ducts and invades into the bathrooms in all floors.

Further, other bad odors and even poisonous gases, such as smoke from burning cigarettes, carbon monoxide produced by burning charcoal, etc., produced in the bathrooms at some floors will also flow along the public pipe shaft and the air ducts into the bathrooms at other floors to seriously threaten the health and living safety of the dwellers in the apartment building.

Therefore, the conventional bathroom extraction fan and the air ducts connected thereto have poor applicability.

SUMMARY

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OF THE INVENTION

A primary object of the present invention is to provide a backflow prevention device for bathroom air duct for preventing gas flow in the air duct from flowing back into the bathroom.

Another object of the present invention is to provide a backflow prevention device that can be conveniently installed on a bathroom air duct.

A further object of the present invention is to provide a backflow prevention device for bathroom air duct that has good applicability.

To achieve the above and other objects, the backflow prevention device for bathroom air duct according to the present invention is connected to an air duct which communicates with a bathroom and leads to external facilities. The backflow prevention device for bathroom air duct includes a case defining a receiving space having two opposite gas inlet-end opening and gas outlet-end opening; a gas inlet-end unit and a gas outlet-end unit respectively mounted to and communicating with the gas inlet-end opening and the gas outlet-end opening; and at least one backflow prevention unit mounted in the receiving space of the case. The backflow prevention unit includes a frame defining an internal space and a plurality of baffle plates pivotally mounted on the frame to locate in the internal space of the frame. The baffle plates are arranged in the frame from top to bottom to overlap with each other, and can be pivotally turned only in one way toward the gas outlet-end opening to an open position. Thus, the backflow prevention device allows gas in a bathroom to flow to a public pipe shaft via the air duct but stops gas with bad odor in the public pipe shaft from flowing back into the bathroom via the air duct, ensuring a sanitary, healthy and safe living environment.

Preferably, the frame of the backflow prevention unit includes two opposite upper and lower side boards, and two opposite left and right side boards; and each of the plurality of baffle plates includes a plate body and a shaft. The plate body has an upper edge portion and a lower edge portion opposite to each other, and the shaft is located at the upper edge portion with two opposite ends of the shaft separately projected from two lateral ends of the plate body to pivotally connect to the left side board and the right side board. Therefore, the baffle plate can be pivotally turned about the shaft to an open position or a closed position.

Preferably, each of the baffle plates includes a gas inlet-end surface and a gas outlet-end surface, which are opposite to each other and face toward the gas inlet-end opening and the gas outlet-end opening of the case, respectively; and the lower edge portion of the plate body is formed into an outward bent cover portion, such that the outward bent cover portion of one upper plate body overlaps and covers an area of the gas outlet-end surface of an adjacent lower plate body at the upper edge portion thereof. With these arrangements, all the baffle plates can only be opened toward the gas outlet-end opening of the case without the possibility of being opened toward the gas inlet-end opening. Thus, gas in the air duct is prevented from flowing back into the bathroom.

Preferably, on each of the baffle plates, the gas outlet-end surface at the upper edge portion is formed into an outer slope, and the gas inlet-end surface at the outward bent cover portion at the lower edge portion is formed into an inner slope. Therefore, any two of the vertically adjacent and overlapped baffle plates can be pivotally turned without interfering with each other to maintain smooth operation thereof.

Preferably, an inner frame is further provided in the internal space of the frame at a position facing toward the gas inlet-end opening of the case, so as to stop gas flow with bad odors from passing through clearances between the baffle plates and the frame to provide an enhanced backflow prevention effect.

Preferably, a leak-preventive gasket packing is provided on outer faces of the frame of the backflow prevention unit, so as to ensure a leak-tight contact between the case and the backflow prevention unit.

Preferably, a first spacing frame is further provided in the receiving space of the case to locate at one side of the backflow prevention unit facing toward the gas outlet-end opening for reserving a space thereat, so as to prevent the baffle plates of the backflow prevention unit from pushing against other objects when the baffle plates are pivotally turned toward the gas outlet-end opening to the open position.

Preferably, the gas inlet-end unit includes a gas inlet-end plate and a gas inlet pipe connected to and communicating with the gas inlet-end plate; and the gas inlet-end plate is mounted to the gas inlet-end opening with the gas inlet pipe communicating with the gas inlet-end-opening. And, an outer end of the gas inlet pipe opposite to the gas inlet-end plate is connected to and communicable with one side of the air duct closer to a bathroom extraction fan.

Preferably, the gas outlet-end unit includes a gas outlet-end plate and a gas outlet pipe connected to and communicating with the gas outlet-end plate; and the gas outlet-end plate is mounted to the gas outlet-end opening with the gas outlet pipe communicating with the gas outlet-end opening. And, an outer end of the gas outlet pipe opposite to the gas outlet-end plate is connected to and communicable with one side of the air duct closer to the external facilities.

Preferably, a fan unit is further provided in the receiving space of the case to locate at a position facing toward the gas inlet-end opening, so that the backflow prevention device also provides the gas extraction function.

Preferably, a second spacing frame is further provided to locate in the receiving space of the case at one side of the fan unit facing toward the gas outlet-end opening, so that a space is reserved at the second spacing frame to prevent the fan unit from interfering with the backflow prevention unit and ensure smooth operation of the fan unit as well as the backflow prevention unit.

BRIEF DESCRIPTION OF THE DRAWINGS

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The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein

FIG. 1 is an exploded perspective view of a backflow prevention device for bathroom air duct according to a first embodiment of the present invention;

FIG. 2 is an assembled sectional view of FIG. 1;

FIG. 3 is an exploded perspective view of a backflow prevention unit adopted in the first embodiment of the present invention;

FIG. 4 is an exploded perspective view of a backflow prevention device for bathroom air duct according to a second embodiment of the present invention;

FIG. 5 is an assembled sectional view of FIG. 4;

FIG. 6 is an exploded perspective view of a backflow prevention device for bathroom air duct according to a third embodiment of the present invention;

FIG. 7 is an assembled sectional view of FIG. 6; and




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stats Patent Info
Application #
US 20100099348 A1
Publish Date
04/22/2010
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0




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20100422|20100099348|backflow prevention device for bathroom air duct|A backflow prevention device is connected to a bathroom air duct and includes a case having two opposite gas inlet-end opening and gas outlet-end opening; a gas inlet-end unit and a gas outlet-end unit respectively mounted to and communicating with the gas inlet-end opening and the gas outlet-end opening; and |Gm-Global-Technology-Operations-Inc
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