BACKPRESSURE-INHIBITING DEVICE FOR EXHAUSTING APPARATUS
An exhausting apparatus includes a duct defining an exhaust channel having an inlet and an outlet, a first fan mounted in the duct, and a first backpressure-inhibiting device mounted in the duct and located in front of the first fan. The first backpressure-inhibiting device includes a partitioning plate having a plurality of through-holes. A negative pressure area is created between the first backpressure-inhibiting device and the first fan when the first fan is driven. Waste gas exhausting efficiency of the exhausting apparatus is enhanced.
1. Field of the Invention
The present invention relates to a backpressure-inhibiting device for an exhausting apparatus. The present invention also relates to an exhausting apparatus with such a backpressure-inhibiting device.
2. Description of the Related Art
An exhausting device is generally used to exhaust waste gas such as oily smoke in a space such as a kitchen. A typical exhausting device includes a duct and a fan driven by a motor. The duct has an inlet in a space and an outlet in communication with outside. Waste gas in the space can be exhausted to the outside by a pressure difference generated in the duct during operation of the fan. However, the operational efficiency of the conventional exhausting device is unsatisfactory due to backpressure. More specifically, a bouncing pressure is generated when airflow in the duct impacts upon a peripheral wall of the duct. In a case that the backpressure is greater than the pressure of the ascending currents to be exhausted, the ascending currents turn into turbulence and, thus, cannot be exhausted as expected. Hence, the resultant exhausting efficiency is unsatisfactory and gas poisoning sometimes occurs.
A filter or purifying device is generally mounted in the outlet section of the duct for filtering waste gas such as oily smoke. This filter or purifying device is mounted behind the fan and located on a wind-facing side with respect to the airflow sucked into the duct by the fan, forming a positive pressure that hinders discharge of the waste gas. Namely, the ascending currents cannot flow smoothly toward the inlet of he duct, leading to undesired separation of the oily smoke in addition to hindrance to the discharge of the waste gas.
SUMMARY OF THE INVENTIONIn accordance with a first aspect of the present invention, an exhausting apparatus comprises a duct defining an exhaust channel including an inlet and an outlet, a first fan mounted in the duct and adapted to be driven, and a first backpressure-inhibiting device mounted in the duct and located in front of the first fan. The first backpressure-inhibiting device includes a partitioning plate having a plurality of through-holes. A negative pressure area is created between the first backpressure-inhibiting device and the first fan when the first fan is driven. Waste gas exhausting efficiency of the exhausting apparatus is enhanced.
Preferably, the first backpressure-inhibiting device includes a plurality of tubes respectively extending through and securely engaged in the through-holes.
In an example, each tube is integral with the partitioning plate and extends from an inner face of the partitioning plate.
Preferably, the backpressure-inhibiting device is mounted in the inlet of the duct.
Preferably, an inlet section is defined between the first fan and the inlet, and the first backpressure-inhibiting device is mounted in the inlet section.
Preferably, the exhaust channel of the duct further includes an outlet section adjacent to the outlet. The exhausting apparatus further includes a second fan mounted in the outlet section and a second backpressure-inhibiting device mounted in the outlet section and located in front of the second fan. A second negative pressure is created between the second fan and the second backpressure-inhibiting device when the second fan is driven to turn. The waste gas exhausting efficiency is further enhanced.
In accordance with a second aspect of the present invention, an exhausting apparatus comprises a hood including a gas inlet, an opening defined below the hood, a fan mounted in the hood and adapted to be driven, and a backpressure-inhibiting device mounted in the opening. The backpressure-inhibiting device includes a partitioning plate having a plurality of through-holes. A negative pressure area is created between the gas inlet and the opening when the fan is driven. Waste gas exhausting efficiency of the exhausting apparatus is enhanced.
Preferably, the backpressure-inhibiting device further includes a plurality of tubes respectively extending through and securely engaged in the through-holes.
In an example, each tube is integral with the partitioning plate and extends from an inner face of the partitioning plate.
Preferably, each tube includes a longitudinal hole defining a passage for waste gas to be discharged.
Preferably, the hood includes two side boards and a bottom board between the side boards, and the partitioning plate is mounted to the bottom board and below the gas inlet.
In an example, the partitioning plate covers the opening.
In another example, the partitioning plate is arcuate in section.
Preferably, the exhausting apparatus further includes an exhaust duct. A filter is mounted in the exhaust duct and includes a plurality of filtering members. Each filtering member includes a hollow casing and a plurality of through-holes in a spherical wall of the hollow casing.
Preferably, each filtering member further includes a plurality of tubes respectively extending into an interior of the hollow casing.
Preferably, each filtering member is a hollow spherical casing.
In accordance with a third aspect of the present invention, a backpressure-inhibiting device for an exhausting apparatus is mounted in a duct of the exhausting apparatus. The backpressure-inhibiting device comprises a partitioning plate and a plurality of through-holes. A tube extends through each through-hole, allowing waste gas to be exhausted to flow therethrough.
Other objectives, advantages, and features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
Referring to
The backpressure-inhibiting device 22 is mounted in the duct 21 and located in front of the fan 23. In this example, the backpressure-inhibiting device 22 is mounted in the inlet 211 of the duct 21. Alternatively, the backpressure-inhibiting device 22 is located in the inlet section 213. With reference to
In the exhausting apparatus 2 in accordance with the present invention, the backpressure-inhibiting device 22 is mounted in the inlet 211 of the duct 21 to form a boundary that separates the inlet section 213 of the duct 21 from an environment outside the inlet 211. When the fan 23 turns, the through-holes 223 or the holes (not labeled) of the tubes 222 act as nozzles such that the sucking force of the fan 23 creates strong, dynamic currents, thereby forming a negative pressure area 4 in the inlet section 213 between the backpressure-inhibiting device 22 and the fan 23. Hence, the ascending currents 24 to be discharged flow smoothly into the duct 21. Furthermore, when the ascending currents 24 that have entered the duct 21 impact upon a peripheral wall at a bend 215 of the duct 21 and, thus, create bouncing currents with a backpressure, this backpressure is stopped by the boundary formed by the backpressure-inhibiting device 22 and forced to move forward by the strong, dynamic currents, thereby enhancing the waste gas (such as oily smoke) exhausting efficiency of the exhausting apparatus 2.
With reference to
In the example shown in
With reference to
A gas chamber 36 is defined in the hood and receives at least one fan 37 driven by a motor 38. A gas inlet 361 is defined in a lower portion of the gas chamber 36 and a gas outlet 362 is defined in an upper portion of the gas chamber 36 and in communication with outside. When the fan 37 turns, the ascending currents (oily smoke 5 and steam) generated during cooking are sucked into the gas chamber 36 via the gas inlet 361 and then discharged to the outside via an exhaust duct 39. In this example, the bottom board 34 includes a protrusion 341 extending into the gas chamber 36 and located under the fan 37, with the protrusion 341 including a hole defining the gas inlet 361.
The filter 1 is mounted in the outlet section of an exhaust duct 39 of the oily smoke exhausting apparatus 3. The filter 1 includes a tubular body 11 and a plurality of filtering members 12 mounted in the tubular body 11. The tubular body 11 includes an oily smoke inlet 111 and an oily smoke outlet 112 located in appropriate positions of the exhaust duct 39. With reference to
In this example, the backpressure-inhibiting device 22 is mounted in the opening in the lower portion (i.e., inlet section) of the hood. The backpressure-inhibiting device 22 includes a partitioning plate 221 for creating a negative pressure area 4 below the gas inlet 361. When the fan 37 turns, the negative pressure area 4 has a pressure lower than that in the gas chamber 36. In an alternative example shown in
The partitioning plate 221 includes a plurality of through-holes 223 providing gas channels for currents. In this example, a plurality of tubes 222 respectively extend through the through-holes 223 into an inner side of the partitioning plate 221. In this example, the tubes 222 are integral with the partitioning plate 221 and extends inward from an inner face of the partitioning plate 221. In an alternative example, each tube 222 has a structure similar to the tube 122 in
With reference to
Furthermore, the backpressure-inhibiting device 22 creates a negative pressure area 4 below the gas inlet 361 such that the ascending currents generated during cooking flow smoothly toward the gas chamber 36 and the exhaust duct 39. Hence, the ascending currents will not stay in the guiding space 35 and form vortex nor will generate backflow. As a result, the oily smoke 5 is smoothly sucked into the gas chamber 36 via the gas inlet 361, enters the exhaust duct 39 and is filtered by the filter 1, and is then discharged to the outside.
Although specific embodiments have been illustrated and described, numerous modifications and variations are still possible. The scope of the invention is limited by the accompanying claims.
Claims
1. An exhausting apparatus comprising:
- a duct defining an exhaust channel including an inlet and an outlet;
- a first fan mounted in the duct and adapted to be driven; and
- a first backpressure-inhibiting device mounted in the duct and located in front of the first fan, the first backpressure-inhibiting device including a partitioning plate having a plurality of through-holes;
- wherein a negative pressure area is created between the first backpressure-inhibiting device and the first fan when the first fan is driven.
2. The exhausting apparatus as claimed in claim 1, with the first backpressure-inhibiting device further including a plurality of tubes respectively extending through and securely engaged in the through-holes.
3. The exhausting apparatus as claimed in claim 2, with each said tube being integral with the partitioning plate and extending from an inner face of the partitioning plate.
4. The exhausting apparatus as claimed in claim 1, with the backpressure-inhibiting device being mounted in the inlet of the duct.
5. The exhausting apparatus as claimed in claim 1, with an inlet section being defined between the first fan and the inlet, and with the first backpressure-inhibiting device being mounted in the inlet section.
6. The exhausting apparatus as claimed in claim 5, with the exhaust channel of the duct further including an outlet section adjacent to the outlet, with the exhausting apparatus further including a second fan mounted in the outlet section and a second backpressure-inhibiting device mounted in the outlet section and located in front of the second fan, and with a second negative pressure being created between the second fan and the second backpressure-inhibiting device when the second fan is driven to turn.
7. An exhausting apparatus comprising:
- a hood including a gas inlet, an opening being defined below the hood;
- a fan mounted in the hood and adapted to be driven; and
- a backpressure-inhibiting device mounted in the opening, the backpressure-inhibiting device including a partitioning plate having a plurality of through-holes;
- wherein a negative pressure area is created between the gas inlet and the opening when the fan is driven.
8. The exhausting apparatus as claimed in claim 7, with the backpressure-inhibiting device further including a plurality of tubes respectively extending through and securely engaged in the through-holes.
9. The exhausting apparatus as claimed in claim 8, with each said tube being integral with the partitioning plate and extending from an inner face of the partitioning plate.
10. The exhausting apparatus as claimed in claim 8, with each said tube including a longitudinal hole defining a passage for waste gas to be discharged.
11. The exhausting apparatus as claimed in claim 7, with the hood including two side boards and a bottom board between the side boards, and with the partitioning plate being mounted to the bottom board and below the gas inlet.
12. The exhausting apparatus as claimed in claim 11, with the partitioning plate covering the opening.
13. The exhausting apparatus as claimed in claim 7, with the partitioning plate being arcuate in section.
14. The exhausting apparatus as claimed in claim 7, with the exhausting apparatus further including an exhaust duct, with a filter being mounted in the exhaust duct and including a plurality of filtering members, each said filtering member including a hollow casing and a plurality of through-holes in a spherical wall of the hollow casing.
15. The exhausting apparatus as claimed in claim 14, with each said filtering member further including a plurality of tubes respectively extending into an interior of the hollow casing.
16. The exhausting apparatus as claimed in claim 14, with each said filtering member being a hollow spherical casing.
17. A backpressure-inhibiting device for an exhausting apparatus, the backpressure-inhibiting device being adapted to be mounted in a duct of the exhausting apparatus, the backpressure-inhibiting device comprising a partitioning plate and a plurality of through-holes, with a tube extending through each said through-hole, allowing waste gas to be exhausted to flow therethrough.
18. The backpressure-inhibiting device as claimed in claim 17, with each said tube extending to an inner side of the backpressure-inhibiting device.
19. The backpressure-inhibiting device as claimed in claim 17, with each said tube including a longitudinal hole defining a passage for the waste gas to be discharged.
20. The backpressure-inhibiting device as claimed in claim 17, with the partitioning plate being arcuate in section.
Type: Application
Filed: Dec 27, 2006
Publication Date: Oct 4, 2007
Inventor: Chin-Tuan Liao (Chao-Zhou)
Application Number: 11/616,768
International Classification: F24C 15/20 (20060101);