EP2839217A1

EP2839217A1 - Rotary air curtain generating device used in a fume purification device, and range hood comprising such device

Info

Publication number: EP2839217A1
Application number: EP13720276.8A
Authority: EP
Inventors: Christian Boehm; Adnen KATEB; Peter Schlotmann; Lei Yang
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2012-04-20
Filing date: 2013-04-11
Publication date: 2015-02-25
Also published as: WO2013156372A1; CN103375831A

Abstract

The present invention provides a rotary air curtain generating device (1) used in a fume purification device, where the rotary air curtain generating device (1) is used to generate a rotary air curtain surrounding a fume path and/or a fume source. In this way, in one aspect, fume dissipation can be remarkably reduced due to existence of the air curtain; and in another aspect, as the air curtain is rotary, fume suction of the fume purification device can be further enhanced.

Description

ROTARY AIR CURTAIN GENERATING DEVICE USED IN A FUME PURIFICATION DEVICE, AND RANGE HOOD COMPRISING SUCH DEVICE

BACKGROUND OF THE INVENTION

Field of Invention The present invention relates to the field of fume purification, and in particular, to a range hood.

Related Art

An extractor hood is also referred to as a range hood, which is a kitchen appliance for purifying the kitchen environment. The range hood is mounted above a stove in the kitchen, which can fast exhaust waste produced due to combustion by the stove and fume harmful to people's health and produced in a cooking process, and discharge the waste and the fume out of the room, thereby reducing indoor pollution, purifying indoor air, and having security control functions such as gas defense and explosion protection.

How to reduce fume dissipation and further to improve a fume suction effect is a widely concerned technical problem in the filed all the time, which directly affects market competitiveness of the range hood. For the foregoing technical problem, various solutions, such as additionally mounting a curtain for preventing fume dissipation, or improving power of a fan system, are provided in the prior art. However, these existing solutions either have an undesirable effect, or bring about new problems such as louder noise and increased power consumption, so the solutions fail to well solve the foregoing technical problem.

Unless supported by sufficient evidences, the prior art described herein does not mean that it is known to those of ordinary skill in the art before the filing date of this application. SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a technical solution for a range hood capable of remarkably reducing fume dissipation and further improving a fume suction effect. Specifically, the present invention provides a rotary air curtain generating device used in a fume purification device, where the rotary air curtain generating device is used to generate a rotary air curtain surrounding a fume path and/or a fume source. In this way, in one aspect, fume dissipation can be remarkably reduced due to existence of the air curtain; and in another aspect, as the air curtain is rotary, fume suction of the fume purification device can be further enhanced.

Optionally, the rotary air curtain generating device includes a driving portion and a hollow casing, where the casing includes a fume inlet and a fume outlet, and a blade is disposed on an edge that encircles to form the fume inlet; and the driving portion is used to drive the casing to rotate, so as to drive the blade to generate the rotary air curtain. Such a rotary air curtain generating device has a low manufacturing cost, and the generated rotary air curtain has a desirable effect.

Optionally, the edge that encircles to form the fume inlet is in a ring shape, and an outer diameter of the ring is b, where and 80mm<b<480mm. It is found after a great deal of tests that, when this technical feature is adopted, a better use effect can be achieved. Optionally, an edge that encircles to form the fume outlet is in a ring shape, and an outer diameter of the ring is a, where 50mm<a<200mm. It is found after a great deal of tests that, when this technical feature is adopted, a better use effect can be achieved.

Optionally, an area of the fume inlet is greater than that of the fume outlet. It is found after a great deal of tests that, when this technical feature is adopted, a better use effect can be achieved.

Optionally, an area of the fume inlet is 1 .618 times that of the fume outlet. It is found after a great deal of tests that, when correspondence between the area of the fume inlet and that of the fume outlet adopts this technical feature, a better use effect can be achieved. Optionally, the number of the blade is at least two, the blades are evenly slantly disposed on the edge that encircles to form the fume inlet, and an included angle between each blade and a horizontal plane is a. It is found after a great deal of tests that, when this technical feature is adopted, a better use effect can be achieved. Optionally, 15°<a<85°. It is found after a great deal of tests that, when correspondence between the area of the fume inlet and that of the fume outlet adopts this technical feature, a better use effect can be achieved.

Optionally, the rotary air curtain is in the shape of a truncated cone as a whole. It is found after a great deal of tests that, when this technical feature is adopted, a better use effect can be achieved.

Optionally, a projection direction of the rotary air curtain is opposite to a fume flow direction. In this way, a tornado effect can be achieved, that is, the fume flows to the fume purification device in a tornado form.

The present invention further provides a range hood, which is disposed with the rotary air curtain generating device according to any item of the above content. In this way, in one aspect, fume dissipation can be remarkably reduced due to existence of the air curtain; and in another aspect, as the air curtain is rotary, fume suction of the range hood can be further enhanced.

Optionally, the range hood is disposed with an air inlet duct, the fume outlet is connected to the air inlet duct, and the air inlet duct is connected to a negative pressure generating device.

Optionally, the range hood is disposed with an electric motor and an impeller, where the electric motor is further used to drive the casing to rotate. That is, the electric motor is the driving portion. Optionally, the impeller is a multi-blade centrifugal impeller, and the fume outlet is connected to and disposed at an air inlet of the multi-blade centrifugal impeller. In this way, under the effect of both the rotary air curtain generating device and the multi-blade centrifugal impeller, a tornado effect can be achieved, that is, the fume flows to the fume purification device in a tornado form. Optionally, an air speed caused by the multi-blade centrifugal impeller is 1.5 to 3 times that caused by the rotary air curtain generating device. It is found after a great deal of tests that, when this technical feature is adopted, a better use effect can be achieved.

The summary of the present invention is not intended to describe all possible implementation manners of the present invention. In the whole application, instructions are provided through examples at many places, and these examples can be used in various feasible combinations.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a schematic structural diagram of Embodiment 1 of a rotary air curtain generating device of the present invention;

FIG. 2 is another schematic structural diagram of Embodiment 1 of a rotary air curtain generating device of the present invention;

FIG. 3 is a sectional view along a B-B line in FIG. 2;

FIG. 4 is a schematic diagram of an application state of Embodiment 1 of the rotary air curtain generating device of the present invention;

FIG. 5 is a sectional view of a structure shown in FIG. 4; FIG. 6 is a schematic diagram of an application state of Embodiment 2 of a rotary air curtain generating device of the present invention;

FIG. 7 is a schematic diagram of another application state of Embodiment 2 of the rotary air curtain generating device of the present invention;

FIG. 8 is a schematic diagram of still another application state of Embodiment 2 of the rotary air curtain generating device of the present invention; FIG. 9 is a sectional view along an A- A line in FIG. 8;

FIG. 10 is a schematic diagram of an application state of Embodiment 3 of a rotary air curtain generating device of the present invention;

FIG. 11 is a schematic diagram of another application state of Embodiment 3 of the rotary air curtain generating device of the present invention; and

FIG. 12 is a sectional view along a B-B line in FIG. 11.

List of the numerals:

1. rotary air curtain generating device, 2. casing, 3. fume inlet, 4. fume outlet, 5. blade, 6. air inlet duct, and 7. impeller DETAILED DESCRIPTION OF THE INVENTION

In order to make the objectives, solutions, and beneficial advantages of the present invention more comprehensible, the present invention is described in further detail below with reference to the accompanying drawings and the exemplary embodiments. It should be first noted that, in the following specific description of the exemplary embodiments, the same or similar features have the same mark. In addition, some accompany drawings may not be precise enough, and in such a case, the present invention should be subject to the text description.

Embodiment 1

The present invention provides a first embodiment of a rotary air curtain generating device 1 used in a range hood, as shown in FIG. 1 to FIG. 5. The rotary air curtain generating device 1 includes a hollow casing 2, and the casing 2 includes a fume inlet 3 and a fume outlet 4. Twelve blades 5 are evenly disposed at an edge that encircles to form the fume inlet 3. The blades 5 each have the same shape, and are in a sheet shape. The blades 5 are slantly disposed at the edge that encircles to form the fume inlet 3, and an included angle between each blade 5 and a horizontal plane is a, where a=60°. The edge that encircles to form the fume inlet 3 is in a ring shape, and an outer diameter of the ring is b, where b=330 mm. An edge that encircles to form the fume outlet 4 is also in a ring shape, and an outer diameter of the ring is a, where a=120 mm.

The rotary air curtain generating device 1 is further disposed with a driving portion (not shown), used to drive the casing 2 to rotate. As the casing 2 rotates, the blades 5 are driven to generate a rotary air curtain that surrounds a fume path and a fume source. The "fume path" refers to a path of the fume flowing from the fume source to the range hood. A projection direction of the rotary air curtain is opposite to a fume flow direction (which should be construed as that the two directions are not precisely opposite to each other in a mathematical meaning, but opposite to each other in general). The fume flow direction refers to a direction of the fume flowing from the fume source to the range hood. The "projection direction of the rotary air curtain" refers to a direction of the blade 5 pointing to a terminal of the rotary air curtain. The rotary air curtain is in the shape of a truncated cone as a whole, and the position of the blades 5 corresponds to an upper surface of the truncated cone. It should be noted that, the reason why what is generated is referred to as the "rotary air curtain" is because an airflow forming the air curtain moves both at the projection direction of the air curtain and at a circumferential direction of the air curtain. The "circumferential direction" refers to a direction surrounding an axis of the truncated cone.

As shown in FIG. 4 and FIG. 5, the range hood is disposed with an air inlet duct 6. The fume outlet 4 of the rotary air curtain generating device 1 is connected (belongs to a movable connection; when the casing 2 rotates, the air inlet duct 6 keeps still) to the air inlet duct 6. In addition, the air inlet duct 6 is further connected to a negative pressure generating device. The negative pressure generating device is used to generate a negative pressure in the air inlet duct 6, so that the fume flows from the fume source to the air inlet duct 6. Specifically, the negative pressure generating device may be a fan, such as an axial flow fan or a centrifugal fan; and the negative pressure generating device may also be another existing device capable of generating a negative pressure and being applied in this embodiment. Just under the effect of both the negative pressure generating device and the rotary air curtain generating device 1 , a tornado effect can be achieved, that is, the fume flows to the air inlet duct 6 in a tornado form, thereby remarkably improving a fume suction effect. The above description is merely an exemplary embodiment of the present invention, and other embodiments may be further obtained by modifying or replacing some technical features. For example, the blade may also adopt other feasible shape than the sheet shape. For another example, it is also feasible that the projection direction of the rotary air curtain is the same as the fume flow direction, yet in such a case, a specific structure of the rotary air curtain generating device is different from that in this embodiment.

Embodiment 2

The present invention provides a second embodiment of a rotary air curtain generating device 1 used in a range hood, as shown in FIG. 6 to FIG. 9. The rotary air curtain generating device 1 includes a hollow casing 2, and the casing 2 includes a fume inlet 3 and a fume outlet 4. Ten blades 5 are evenly disposed at an edge that encircles to form the fume inlet 3. The blades 5 each have the same shape, and are in a sheet shape. The blades 5 are slantly disposed at the edge that encircles to form the fume inlet 3, and an included angle between each blade 5 and a horizontal plane is a, where a=45°. The edge that encircles to form the fume inlet 3 is in a ring shape, and an outer diameter of the ring is b, where b=242.7 mm. An edge that encircles to form the fume outlet 4 is also in a ring shape, and an outer diameter of the ring is a, where a=150 mm.

The range hood is disposed with an electrical motor and a multi-blade centrifugal impeller 7. A flange portion is disposed at the fume outlet 4 of the casing 2, where the flange portion is connected and disposed at an air inlet of the multi-blade centrifugal impeller 7 through a screw connection, as shown in FIG. 6. The electrical motor is used to drive the multi-blade centrifugal impeller 7 to rotate, so as to drive the casing 2 to rotate. The multi-blade centrifugal impeller 7 rotates and generates a negative pressure, so that the fume flows from the fume source to the multi-blade centrifugal impeller 7. As the casing 2 rotates, the blades 5 are driven to generate a rotary air curtain that surrounds a fume path and the fume source. The "fume path" refers to a path of the fume flowing from the fume source to the range hood. A projection direction of the rotary air curtain is opposite to a fume flow direction (which should be construed as that the two directions are not precisely opposite to each other in a mathematical meaning, but opposite to each other in general). The fume flow direction refers to a direction of the fume flowing from the fume source to the range hood. The "projection direction of the rotary air curtain" refers to a direction of the blade 5 pointing to a terminal of the rotary air curtain. The rotary air curtain is in the shape of a truncated cone as a whole, and the position of the blades 5 corresponds to an upper surface of the truncated cone. It should be noted that, the reason why what is generated is referred to as the "rotary air curtain" is because an airflow forming the air curtain moves both at the projection direction of the air curtain and at a circumferential direction of the air curtain. The "circumferential direction" refers to a direction surrounding an axis of the truncated cone. Just under the effect of both the multi-blade centrifugal impeller 7 and the rotary air curtain generating device 1 , a tornado effect can be achieved, that is, the fume flows to the air inlet duct 6 in a tornado form, thereby remarkably improving a fume suction effect. In this embodiment, an air speed caused by the multi-blade centrifugal impeller 7 is

2.5 times that caused by the rotary air curtain generating device 1.

Embodiment 3

The present invention provides a third embodiment of a rotary air curtain generating device 1 used in a range hood, as shown in FIG. 10 to FIG. 12. The rotary air curtain generating device 1 includes a hollow casing 2, and the casing 2 includes a fume inlet 3 and a fume outlet 4. Twelve blades 5 are evenly disposed at an edge that encircles to form the fume inlet 3. The blades 5 each have the same shape, and are in a sheet shape. The blades 5 are slantly disposed at the edge that encircles to form the fume inlet 3, and an included angle between each blade 5 and a horizontal plane is a, where a=75°. An edge that encircles to form the fume inlet 3 is in a ring shape, and an outer diameter of the ring is b, where b=450 mm. An edge that encircles to form the fume outlet 4 is also in a ring shape, and an outer diameter of the ring is a, where a=180 mm.

The range hood is disposed with an electric motor and an impeller 7. The fume outlet 4 of the casing 2 is connected and disposed at an air inlet of the impeller 7. The electric motor is used to drive the impeller 7 to rotate, so as to drive the casing 2 to rotate. The impeller 7 rotates and generates a negative pressure, so that the fume flows from a fume source to the impeller 7. As the casing 2 rotates, the blades 5 are driven to generate a rotary air curtain that surrounds a fume path and the fume source. The "fume path" refers to a path of the fume flowing from the fume source to the range hood. A projection direction of the rotary air curtain is opposite to a fume flow direction (which should be construed as that the two directions are not precisely opposite to each other in a mathematical meaning, but opposite to each other in general). The fume flow direction refers to a direction of the fume flowing from the fume source to the range hood. The "projection direction of the rotary air curtain" refers to a direction of the blade 5 pointing to a terminal of the rotary air curtain. The rotary air curtain is in the shape of a truncated cone as a whole, and the position of the blades 5 corresponds to an upper surface of the truncated cone. It should be noted that, the reason why what is generated is referred to as the "rotary air curtain" is because an airflow forming the air curtain moves both at the projection direction of the air curtain and at a circumferential direction of the air curtain. The "circumferential direction" refers to a direction surrounding an axis of the truncated cone. Just under the effect of both the impeller 7 and the rotary air curtain generating device 1 , a tornado effect can be achieved, that is, the fume flows to the air inlet duct 6 in a tornado form, thereby remarkably improving a fume suction effect.

It should be additionally noted that, the present invention should not be construed to be limited to the implementation manners described above, but should be construed as covering all possible implementation situations determined by the claims of the present invention in combination with the content disclosed by the specification. Therefore, content without departing from the technical solutions of the present invention, and any simple modification and equivalent change made to the foregoing embodiments according to the technical essence of the present invention shall all fall within the protection scope of the technical solutions of the present invention. It should be particularly pointed out that, any inferior application based on the present invention still fall within the protection scope of the technical solutions of the present invention.

Claims

CLAIMS What is claimed is:

1. A rotary air curtain generating device (1 ) used in a fume purification device, characterized in that: the rotary air curtain generating device (1 ) is used to generate a rotary air curtain surrounding a fume path and/or a fume source.

2. The rotary air curtain generating device (1 ) according to claim 1 , characterized in that: the rotary air curtain generating device (1 ) comprises a driving portion and a hollow casing (2); the casing (2) comprises a fume inlet (3) and a fume outlet (4), and a blade (5) is disposed on an edge that encircles to form the fume inlet (3); and the driving portion is used to drive the casing (2) to rotate, so as to drive the blade (5) to generate the rotary air curtain.

3. The rotary air curtain generating device (1 ) according to claim 2, characterized in that: the edge that encircles to form the fume inlet (3) is in a ring shape, and an outer diameter of the ring is b; and

80 mm<b<480 mm.

4. The rotary air curtain generating device (1 ) according to claim 3, characterized in that: an edge that encircles to form the fume outlet (4) is in a ring shape, and an outer diameter of the ring is a; and

50 mm<a<200 mm.

5. The rotary air curtain generating device (1 ) according to claim 2, characterized in that: an area of the fume inlet (3) is greater than that of the fume outlet (4).

6. The rotary air curtain generating device (1 ) according to claim 5, characterized in that: an area of the fume inlet (3) is 1 .618 times that of the fume outlet (4).

7. The rotary air curtain generating device (1 ) according to claim 2, characterized in that: the number of the blade (5) is at least two; and the blades (5) are evenly slantly disposed on the edge that encircles to form the fume inlet (3), and an included angle between each blade (5) and a horizontal plane is a

8. The rotary air curtain generating device (1 ) according to claim 7, characterized in that:

15°<a<85° 9. The rotary air curtain generating device (1 ) according to claim 1 , characterized in that: the rotary air curtain is in the shape of a truncated cone as a whole.

10. The rotary air curtain generating device (1 ) according to claim 1 , characterized in that: a projection direction of the rotary air curtain is opposite to a fume flow direction.

1 1 . A range hood, disposed with the rotary air curtain generating device (1 ) according to any one of claims 1 to 10.

12. The range hood according to claim 1 1 , characterized in that: the range hood is disposed with an air inlet duct (6); the fume outlet (4) is connected to the air inlet duct (6); and the air inlet duct (6) is connected to a negative pressure generating device.

13. The range hood according to claim 1 1 , characterized in that: the range hood is disposed with an electric motor and an impeller (7); and the electric motor is further used to drive the casing (2) to rotate.

14. The range hood according to claim 13, characterized in that: the impeller (7) is a multi-blade centrifugal impeller (7); and the fume outlet (4) is connected to and disposed at an air inlet of the multi-blade centrifugal impeller (7).

15. The range hood according to claim 14, characterized in that: an air speed caused by the multi-blade centrifugal impeller (7) is 1.5 to 3 times that caused by the rotary air curtain generating device (1 ).