HK1162067A - Suction hood - Google Patents

Description

Suction hood

Technical Field

The present invention relates to a suction hood which sucks air from a first area to a second area.

Background

Known or conventional suction hoods (which may also be referred to as burner hoods, range hoods, kitchen hoods, stove hoods, exhaust hoods, cooker hoods, extractor hoods, smoke hoods or ventilation hoods) are used for removing airborne grease, combustion products, smoke, odors and/or heat and vapors that are typically generated on the cooktop by the cooking process, usually by a combination of filtration and extraction of the air. The suction hood generally comprises three main components: a skirt or catch panel to contain the elevated gases (also referred to as "exhaust plume"); one or more grease filters; and fans or tangential blowers for forced air.

The extractor hood has two main purposes: ventilation use and recycling use. In ventilation applications, the output collar of the blower motor of the extractor hood is mounted on a duct system that terminates outside the kitchen. In recirculation applications, filters containing activated carbon are used to remove odors and smoke particles from the air prior to releasing the cleaned air back into the kitchen environment.

The fan or blower, when activated, creates a low pressure area that acts spherically around the shroud.

Airborne grease, combustion products, smoke, odors, heat and vapors produced on the cooktop by cooking the food product naturally rise in a vertical motion due to the effect of gravity and enter the active area of the hood to be captured by the low pressure area.

Conventional hoods as described above are relatively inefficient at least in treating fumes from the cooktop because they likewise draw air from the surrounding environment. Fig. 1a shows such a hood 1 'in which gas is drawn from all sides along the path indicated by arrow 74'.

The pressure field 71 ' of the conventional hood 1 ' above the cooktop 7 ' is shown in fig. 1 b. The pressure field represents the effective pumping volume of the hood.

In WO89/11926a1, ventilation systems have been proposed having nozzles and/or blowers mounted around one or more centrally arranged discharge channels.

Disclosure of Invention

The object of the invention is to improve the characteristics of the hood, in particular the suction characteristics.

This object is achieved by a suction hood according to claim 1. Preferred embodiments can be derived in particular from the dependent claims.

The invention relates, according to claim 1, to a suction hood,

a) the suction hood sucking air from the first area to the second area;

b) wherein this cover includes:

b1) a first suction device for drawing air towards the suction hood by generating an at least substantially direct suction towards the suction hood; and

b2) a second suction device which draws air towards the suction hood by generating an at least substantially circular, cyclonic or spiral movement.

Preferably, the second suction means creates a cyclonic suction in the region below it, which can enhance and concentrate the suction. The combination of the first suction means and the second suction means according to the invention enables the suction characteristics of the suction hood to be improved, since the addition of the second suction means will in particular enable the suction to be improved and/or concentrated in the area below the second suction means, which is preferably used for cooking.

In a preferred embodiment, the second suction device is or can be operated in a boost mode, whereby the second suction device temporarily boosts the suction of the first suction device. This can enhance the suction in the case of, for example, a large amount of smoke being generated. By activating the boost mode, smoke can generally be more quickly vented or reduced.

Preferably, the first and second suction devices are or can be operated in a pulsed mode of operation and/or alternately. This enables, on the one hand, a more rapid evacuation or reduction of smoke under the second suction device when it is in operation, and also enables removal of smoke from the surrounding area when the first suction device is in operation.

In a preferred embodiment, the first and second suction devices are operable together or operable together, so that the second suction device continuously enhances suction of the first suction device. This enables increased suction in the area below the second suction device and also enables suction of air from the surrounding area by the first suction device.

Preferably, the outer suction region surrounds the inner suction region, wherein preferably

a) The first suction device sucks air to the suction hood mainly through the outer suction area, and/or

b) The second suction device draws air at least substantially uniformly through the outer suction region and the inner suction region toward the suction hood.

In this case, at least substantially separate suction zones are used for the two suction devices, so that the suction zones can complement one another without too much interference or cancellation with one another.

In a preferred embodiment, the air used to manipulate the vortex is preferably drawn laterally through the lateral openings and/or from the outer suction area. This enables a relatively easy supply of the required air without undesirably influencing the circular, cyclonic or spiral movement.

Preferably, the second suction means is attached or attachable by attachment means, preferably in terms of noise, efficiency and/or smoke, preferably switch and/or sensor driven means. In this way, the second suction device can be attached only when needed.

In a preferred embodiment, the second suction device is a cyclonic suction hood and/or the first suction device is a standard suction hood.

Preferably, the suction hood is a ventilation and/or recirculation suction hood. Both embodiments can be used in a preferred manner with a suction device.

Furthermore, the invention relates to a method for generating air suction by means of a suction hood as claimed in any of the foregoing claims.

Drawings

The invention will be described in more detail below with reference to the accompanying drawings, in which:

FIG. 1c schematically illustrates the concept of a cyclonic suction hood;

FIG. 1d shows a pressure field of the cover system according to FIG. 1 c;

FIGS. 2a to 2c show embodiments of the present invention, and wherein

Detailed Description

Fig. 1c schematically shows the concept of a cyclone suction hood 1. Arrows 75 indicate the rotating air column and arrows 74 indicate the suction ventilation. The combination of these two flows creates a cyclone. Air is drawn through the air inlets 101, 102 and is thus pushed into the suction channel 13.

The pressure field 71 of such a cover system 1 is shown in fig. 1 d. The pressure field represents the effective pumping volume of the hood. The vortex created between the cooktop 7 and the hood 1 will draw smoke from the cooktop 7 in a spiral motion.

Fig. 2a to 2c show an embodiment of the invention. FIG. 2a shows a perspective view of the housing with the vortex module 62. FIG. 2b shows a cross-sectional view of the cover, while FIG. 2c shows a bottom view of the cover with the scroll module 62.

The suction hood 6 includes: a first suction device 64 which draws air towards the suction hood by generating an at least substantially direct suction towards the suction hood 6; and a second suction device 62 which draws air towards the suction hood 6 by generating an at least substantially circular, cyclonic or spiral movement.

The suction hood 6 comprises a cuboid-shaped upper part 681, below which a lower part 682 is arranged, which lower part 682 has an at least approximately square-shaped upper surface and a lower surface, between which four somewhat longer side surfaces are arranged. Air inlets 601 and 602 are shown to the side of lower section 682.

The upper member 681 and the lower member 682 are disposed directly adjacent, with the common surface omitted to allow air to flow therethrough.

Fig. 2b shows a plurality of suction channels 623 of the swirl module 62, which are arranged tangentially around the annular region 622. An engine, not shown, blows air tangentially from the air inlets 601 and 602 through the outer suction region 634 into the inner suction region 631 of the shroud 6, thereby creating ventilation air. The ventilation air in turn creates suction that draws air in and through the interior suction area 631. Air escapes the suction zone at outlet 633. This is also known as cyclone aspiration (aspuration).

Centrally disposed in the upper part 681 is a suction device 64 which is able to suck air directly upwards through the inner suction region 631 and the outer suction region 634. This is also known as standard inspiration.

The hood 6 can operate with standard suction as well as cyclonic suction. This can be done in three different ways:

in the first mode, cyclone suction is added in the pulse mode of operation, so that cyclone suction and standard suction are alternately operated. For example, a cyclone suction is used in the first second, and a standard suction is used in the second. The cyclone is used again for the next second and so on. This means that suction through the suction region 631 will be enhanced during cyclonic suction, whereas suction will be at least substantially throughout the inner and outer suction regions 631, 634 during standard suction.

In the second mode, the cyclonic suction can be operated in the boost mode to amplify the effect of the standard suction. This means that in normal mode only normal suction is run, while for boost cyclone suction is added and suction is boosted mainly in the inner suction zone 631.

In the third mode, the cyclonic suction is operated with the standard suction, so that both modes operate simultaneously. This means that the inner suction region 631 is enhanced while the outer suction region 634 operates at least with respect to the inner suction region 631 with a standard suction.

List of reference numerals

101. 102, 601, 602 air inlet

13 suction channel

6 suction hood

61 first suction device

62 second suction device

622 annular region

623 suction channel

63. 631, 632, 634 suction area

681. 682 shell

Claims (10)

1. A suction hood is provided, which comprises a hood body,

a) the suction hood sucking air from the first area to the second area;

b) wherein this cover includes:

b1) a first suction device (64) for drawing air towards the suction hood by generating an at least substantially direct suction towards the suction hood; and

b2) a second suction device (62) which draws air towards the suction hood by generating an at least substantially circular, cyclonic or spiral movement.

2. A suction hood as claimed in any one of the preceding claims, wherein: the second suction device (62) is or can be operated in a boost mode, whereby the second suction device (62) temporarily boosts the suction of the first suction device (64).

3. A suction hood as claimed in any one of the preceding claims, wherein: the first suction device (64) and the second suction device (62) are or can be operated in a pulsed mode of operation and/or alternately.

4. A suction hood as claimed in any one of the preceding claims, wherein: the first suction device (64) and the second suction device (62) are or can be operated together, whereby the second suction device (62) continuously enhances the suction of the first suction device (64).

5. A suction hood as claimed in any one of the preceding claims, wherein: the outer suction region (634) surrounds the inner suction region (631), wherein preferably

a) The first suction device (64) sucks air to the suction hood mainly through the outer suction area (634) and/or

b) The second suction device (62) draws air at least substantially uniformly through the outer suction region (634) and the inner suction region (631) toward the suction hood.

6. A suction hood as claimed in any one of the preceding claims, wherein: the air used for operating the second suction device (62) is preferably

a) Through the transverse openings (601, 602) and/or

b) From the outside suction area (634)

Is sucked in laterally, wherein the second suction device is preferably a swirl module.

7. Suction hood according to one of the preceding claims,

a) wherein the second suction device (62) is or can be attached by attachment means, preferably in terms of noise, efficiency and/or smoke,

b) wherein the additional device is preferably a switch and/or a sensor drive.

8. Suction hood according to one of the preceding claims,

a) wherein the second suction device (62) is a cyclone suction hood, and/or

b) Wherein the first suction device (64) is a standard suction hood.

9. Suction hood according to any one of the preceding claims, wherein the suction hood is

a) A ventilated suction hood, wherein preferably the first zone is inside the room and the second zone is outside the room; and/or

b) A recirculating suction hood, wherein preferably the first zone is inside the room and the second zone is inside the room.

10. A method for generating air suction by means of a suction hood as claimed in any of the foregoing claims.