Range hood

Abstract

The present invention provides a range hood, comprising: a frame, an air suction duct is arranged inside the frame, and an air suction port is arranged on the air suction duct; a jet air duct, the jet air duct includes: a first cavity, connected to the frame, the first cavity is arranged around the air suction port, and a jet port is arranged on the first cavity; a second cavity, the second cavity is arranged on at least one of the first side and the second side of the first cavity, and an air outlet is arranged on the second cavity. For the range hood provided by the present invention, when the first cavity ejects air flow, a negative pressure is formed around the first cavity, and further, the second cavity located around the first cavity can exhaust air from the air outlet under the action of the negative pressure, that is, under the action of the air flow ejected from the jet port of the first cavity, the air outlet of the second cavity also discharges air flow, which together with the air flow ejected from the first cavity constitutes an air curtain, increasing the air output of the jet air duct and reducing the working noise of the range hood.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and more particularly, to a range hood. Background Art

[0002] Currently, in order to improve the suction and exhaust effect of the range hood, a technical solution with a rotating air curtain has been proposed in the related art. The rotating air curtain can extend the suction distance and wrap the oil fume in the air curtain to isolate it from the user. However, since the formation of the rotating air curtain requires a large amount of air volume, and in the technical solutions disclosed in the related art, only by increasing the rotation speed of the fan can the air volume of the rotating air curtain be increased, resulting in a relatively large noise of the range hood. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, the present invention provides a range hood.

[0005] In view of this, the present invention provides a range hood, including: a frame, an air suction duct is arranged inside the frame, and an air suction port is arranged on the air suction duct; a jet air duct, the jet air duct includes: a first cavity, connected to the frame, the first cavity is arranged around the air suction port, and a jet port is arranged on the first cavity; a second cavity, the second cavity is arranged on at least one of the first side and the second side of the first cavity, and an air outlet is arranged on the second cavity.

[0006] The range hood provided by the present invention includes a frame and a jet air duct. An air suction duct is arranged inside the frame, and an air suction port is arranged on the air suction duct. The range hood sucks oil fume through the air suction port. The jet air duct includes a first cavity and a second cavity. The first cavity is arranged around the air suction port, and a jet port is arranged on the first cavity. Airflow is ejected from the jet port to form an air curtain around the air suction port, isolating the oil fume from the user, preventing the oil fume from spreading, increasing the suction force for sucking the oil fume, and improving the oil fume suction effect. The second cavity is arranged on the first side or the second side of the first cavity. In this way, when the first cavity ejects airflow, a negative pressure is formed around the first cavity, and then the second cavity located around the first cavity can exhaust air through the air outlet under the action of the negative pressure. That is, under the action of the airflow ejected from the jet port of the first cavity, the air outlet of the second cavity also discharges airflow, which together with the airflow ejected from the first cavity constitutes an air curtain, increasing the air volume of the jet air duct, and further being able to form a better-quality air curtain, generating an air curtain with a large jet air volume through a lower power, improving the oil fume suction effect, and reducing the working noise of the range hood.

[0007] According to the above range hood provided by the present invention, the following additional technical features may also be provided:

[0008] In the above technical solution, further, along the air outlet direction of the first cavity, the distance between the wall surface on the first side and the wall surface on the second side of the first cavity gradually decreases.

[0009] In any of the above technical solutions, further, the jet air duct further includes: a plurality of swirl members disposed in the first cavity, the plurality of swirl members being circumferentially distributed along the first cavity, wherein, along the air outlet direction, the swirl member includes a first end and a second end disposed opposite to each other, and from the first end of the swirl member to the second end of the swirl member, the swirl member is inclined with respect to the center line of the jet orifice.

[0010] In any of the above technical solutions, further, the inclination angle of the swirl member with respect to the center line of the jet orifice is greater than or equal to 10° and less than or equal to 30°.

[0011] In any of the above technical solutions, further, the angle between the swirl member and the plane where the jet orifice is located is greater than or equal to 20° and less than or equal to 70°.

[0012] In any of the above technical solutions, further, the height of the swirl member is greater than or equal to 0.2 times the height of the first cavity and less than or equal to 0.3 times the height of the first cavity.

[0013] In any of the above technical solutions, further, the range hood further includes: a plurality of guide members disposed in the second cavity, the plurality of guide members being circumferentially distributed along the second cavity, wherein, along the air outlet direction, the guide member includes a third end and a fourth end disposed opposite to each other, and from the third end of the guide member to the fourth end of the guide member, the guide member is inclined with respect to the center line of the jet orifice.

[0014] In any of the above technical solutions, further, both the first cavity and the second cavity are annular, and the inclination angle of the guide member with respect to the center line of the jet orifice is the same as the inclination angle of the swirl member with respect to the center line of the jet orifice.

[0015] In any of the above technical solutions, further, along the air outlet direction, the jet air duct is gradually expanding, and in the cross-section along the center line of the jet orifice, the included angle between the center line of the jet air duct and the center line of the jet orifice is greater than or equal to 0° and less than or equal to 30°, wherein the distances from the wall surface on the first side and the wall surface on the second side of the first cavity to the center line of the jet air duct are equal.

[0016] In any of the above technical solutions, further, the range hood further includes: a first fan, the first fan being communicated with the suction air duct, and the first fan sucking air through the suction air duct; a second fan, the second fan being communicated with the first cavity, and the second fan being used for exhausting air to the first cavity.

[0017] In any of the above technical solutions, further, the first fan is a centrifugal fan, and the second fan is a mixed-flow fan or a centrifugal fan.

[0018] In any of the above technical solutions, further, the range hood further includes: a plurality of ducts, which are communicated with the second fan and the first cavity, and the plurality of ducts are distributed along the circumferential direction of the first cavity.

[0019] In any of the above technical solutions, further, the range hood includes a side suction range hood, the number of air inlets is two, the number of jet air ducts is two, the two air inlets are spaced apart, and the two jet air ducts are respectively arranged corresponding to the two air inlets; wherein, the number of the second fans is one, and one second fan is communicated with the two jet air ducts, or the number of the second fans is two, and the two second fans are respectively communicated with the two jet air ducts.

[0020] In any of the above technical solutions, further, among the two jet air ducts, the inclination direction of the swirl member of one jet air duct is different from the inclination direction of the swirl member of the other jet air duct.

[0021] In any of the above technical solutions, further, an air inlet is further provided on the frame, and the air inlet is communicated with the second cavity.

[0022] In any of the above technical solutions, further, a shutter is provided at the air inlet, or the air inlet is of a hole and groove structure.

[0023] In any of the above technical solutions, further, the range hood further includes: a grille, which is covered on the air inlet.

[0024] In any of the above technical solutions, further, in the cross-section in the center line direction of the jet orifice, the cross-section of the first cavity is in a wing shape.

[0025] In any of the above technical solutions, further, the first cavity and the second cavity are in an annular shape, the jet orifice is in a slit shape, and the width of the slit is greater than or equal to 3 mm and less than or equal to 5 mm.

[0026] In any of the above technical solutions, further, the width of the second cavity is greater than or equal to 5 times the width of the jet orifice and less than or equal to 10 times the width of the jet orifice.

[0027] In any of the above technical solutions, further, the ratio of the diameter of the wall surface on the second side of the first cavity to the diameter of the air inlet is greater than or equal to 3 and less than or equal to 10.

[0028] The additional aspects and advantages of the present invention will become apparent in the following description part, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and be easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0030] Figure 1 Figure 1 shows one of the schematic structural diagrams of the range hood according to an embodiment of the present invention;

[0031] Figure 2 Figure 2 shows another schematic structural diagram of the range hood according to an embodiment of the present invention;

[0032] Figure 3 shows Figure 2 the cross-sectional view taken along the line A-A in

[0033] Figure 4 shows Figure 2 the cross-sectional view taken along the line B-B in

[0034] Figure 5 Figure 3 shows one of the schematic structural diagrams of the jet air duct of the range hood according to an embodiment of the present invention;

[0035] Figure 6 shows Figure 5 the cross-sectional view taken along the line C-C in

[0036] Figure 7 Figure 4 shows another schematic structural diagram of the jet air duct of the range hood according to an embodiment of the present invention;

[0037] Figure 8 Figure 5 shows another schematic structural diagram of the jet air duct of the range hood according to an embodiment of the present invention;

[0038] Figure 9 shows Figure 8 the cross-sectional view taken along the line D-D in

[0039] Figure 10 Figure 6 shows another schematic structural diagram of the jet air duct of the range hood according to an embodiment of the present invention;

[0040] Figure 11 Figure 7 shows another schematic structural diagram of the jet air duct of the range hood according to an embodiment of the present invention.

[0041] Wherein, Figures 1 to 11 the corresponding relationship between the reference numerals and the component names in

[0042] 1 is the frame, 10 is the suction air duct, 102 is the suction port, 2 is the jet air duct, 20 is the first cavity, 202 is the jet port, 22 is the second cavity, 222 is the air outlet, 224 is the air inlet, 24 is the swirl member, 26 is the guide member, 3 is the first fan, 4 is the second fan, 5 is the pipe, 6 is the grille, 7 is the center line of the jet port. Detailed Embodiments

[0043] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0044] In the following description, many specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0045] The following refers to Figures 1 to 11 a range hood described according to some embodiments of the present invention.

[0046] Embodiment 1:

[0047] As Figure 1 、 Figure 2 and Figure 4 shown, according to an embodiment of the present invention, the present invention provides a range hood including: a frame 1 and a jet air duct 2.

[0048] Among them, an air suction duct 10 is provided in the frame 1, and an air suction port 102 is provided on the air suction duct 10; the jet air duct 2 includes: a first cavity 20 and a second cavity 22. The first cavity 20 is connected to the frame 1, the first cavity 20 is disposed around the air suction port 102, and a jet port 202 is provided on the first cavity 20; the second cavity 22 is disposed on at least one of the first side and the second side of the first cavity 20, and an air outlet 222 is provided on the second cavity 22.

[0049] The range hood provided by the present invention includes a frame 1 and a jet air duct 2. An air suction duct 10 is arranged inside the frame 1, and an air suction port 102 is arranged on the air suction duct 10. The range hood sucks oil fumes through the air suction port 102. The jet air duct 2 includes a first cavity 20 and a second cavity 22. The first cavity 20 is arranged around the air suction port 102, and a jet port 202 is arranged on the first cavity 20. Airflow is ejected from the jet port 202 to form an air curtain around the air suction port 102, isolating the oil fumes from the user, preventing the oil fumes from spreading, increasing the suction force for sucking the oil fumes, and improving the oil fume suction effect. The second cavity 22 is arranged on the first side or the second side of the first cavity 20. In this way, when the first cavity 20 ejects airflow, a negative pressure is formed around the first cavity 20, so that the second cavity 22 located around the first cavity 20 can exhaust air from the air outlet 222 under the action of the negative pressure. That is, under the action of the airflow ejected from the jet port 202 of the first cavity 20, the air outlet 222 of the second cavity 22 also discharges airflow, which together with the airflow ejected from the first cavity 20 constitutes an air curtain, increasing the air output of the jet air duct 2, and thus being able to form a better-quality air curtain, generating an air curtain with a large jet air volume with a lower power, improving the oil fume suction effect, and reducing the working noise of the range hood.

[0050] It can be understood that, as Figure 2 shown, the first side of the first cavity 20 is the side of the first cavity 20 close to the air suction port, that is, the inner side of the first cavity 20, and the second side of the first cavity 20 is the side of the first cavity 20 away from the air suction port, that is, the outer side of the first cavity 20. Specifically, the second cavity 22 is formed on the inner side of the first cavity 20, or the second cavity 22 is formed on the outer side of the first cavity 20, or the second cavity 22 is formed on the inner side and the outer side of the first cavity 20. More specifically, both the first cavity 20 and the second cavity 22 are annular, and the first cavity 20 and the second cavity 22 are arranged around the air suction port 102.

[0051] In a specific application, the frame 1 includes a housing and a panel. The housing and the panel enclose a cavity. The air suction duct 10 is arranged in the cavity, and the air suction port 102 is arranged on the panel and communicated with the air suction duct 10. The jet air duct 2 is arranged on the panel, and at least a part of the jet air duct 2 protrudes from the panel and is arranged around the air suction port 102. Among them, the jet port 202 and the air outlet 222 are arranged adjacent to each other. Thus, under the jet of the jet port 202, a negative pressure is formed at the air outlet 222, so that more airflow flows out under the action of the negative pressure, increasing the air output.

[0052] The range hood proposed by the present invention increases the wind speed of the air flow ejected from the first cavity 20 through the jet flow of the jet port 202, realizes long-distance air supply, increases the distance of the air curtain, and improves the oil fume suction capacity. At the same time, the air flow passes through the first cavity 20 and then is ejected from the jet port 202, making the air pressure distribution of the air flow in the first cavity 20 uniform, which is conducive to forming a uniform air curtain. By combining the jet flow of the jet port 202 with the air outlet of the second cavity 22 under its negative pressure, the air discharge volume of the jet air duct 2 is increased, and the noise of the range hood is reduced.

[0053] Embodiment 2:

[0054] As Figure 3 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: along the air outlet direction of the first cavity 20, the distance between the wall surface on the first side and the wall surface on the second side of the first cavity 20 gradually decreases.

[0055] In this embodiment, along the air outlet direction of the first cavity 20, the distance between the wall surface on the first side and the wall surface on the second side of the first cavity 20 gradually decreases. Then, from the air inlet end of the first cavity 20 to the direction of the jet port 202, the gas flow channel gradually decreases, thereby increasing the flow velocity of the air flow ejected from the jet port 202, realizing long-distance air supply, and further improving the oil fume suction capacity.

[0056] Embodiment 3:

[0057] According to an embodiment of the present invention, on the basis of the above embodiment, further: the jet air duct 2 further includes: a plurality of swirl members 24, which are arranged in the first cavity 20, and the plurality of swirl members 24 are distributed along the circumferential direction of the first cavity 20. Among them, along the air outlet direction, the swirl member 24 includes a first end and a second end that are oppositely arranged, and from the first end of the swirl member 24 to the second end of the swirl member 24, the swirl member 24 is inclined with respect to the center line 7 of the jet port.

[0058] In this embodiment, the jet air duct 2 further includes a plurality of swirl members 24, and the plurality of swirl members 24 are arranged in the first cavity 20 and distributed along the circumferential direction of the first cavity 20. Among them, the swirl member 24 includes a first end and a second end. The first end of the swirl member 24 is close to the air inlet end of the first cavity 20, and the second end of the swirl member 24 is close to the jet port 202. In this way, when the range hood is turned on, the air flow flows from the first end of the swirl member 24 to the second end of the swirl member 24. Since the swirl member 24 is inclined, under the guidance of the swirl member 24, the air flow rotates along the circumferential direction of the first cavity 20, and then forms a rotating air curtain after being discharged from the first cavity 20 by the jet port 202, thereby effectively converging the oil fume and improving the oil fume suction effect.

[0059] It should be noted that from the first end to the second end of the swirl member 24, the swirl member 24 is inclined with respect to the center line 7 of the jet port, that is, along the circumferential direction of the first cavity 20, the first end of the swirl member 24 is located in front of or behind the second end of the swirl member 24, so as to be able to guide the air flow to rotate in the clockwise or counterclockwise direction along the first cavity 20, so as to form a rotating air curtain.

[0060] In a specific application, a plurality of swirl members 24 are equidistantly distributed or equally angularly distributed along the circumferential direction of the first cavity 20, so that the rotating air curtain is more uniform. More specifically, the swirl member 24 is a swirl vane.

[0061] Embodiment 4:

[0062] As Figure 11 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: the inclination angle a1 of the swirl member 24 with respect to the center line 7 of the jet port is greater than or equal to 10° and less than or equal to 30°.

[0063] In this embodiment, the swirl member 24 is inclined, so that the air flow discharged from the jet port 202 forms a rotating air curtain, improving the oil fume suction effect. Among them, from the first end to the second end of the swirl member 24, the swirl member 24 is inclined with respect to the center line 7 of the jet port. If the inclination angle is too large, it will increase the wind resistance of the air flow, making the pressure distribution of each part uneven. If the inclination angle is too small, it is not conducive to forming a rotating air curtain. Therefore, the inclination angle a1 of the swirl member 24 with respect to the center line 7 of the jet port is set to be greater than or equal to 10° and less than or equal to 30°, which not only ensures the rotating air curtain effect but also reduces the resistance of the air flow.

[0064] In a specific application, the size of the included angle a1 between the swirl member 24 and the center line 7 of the jet port is mainly determined by the diameter of the ring formed by the jet ports 202. The larger the diameter, the smaller the angle.

[0065] Specifically, the inclination angle a1 of the swirl member 24 with respect to the center line 7 of the jet port can be set to 15°, 20°, 25°, etc.

[0066] Further, the included angle between the swirl member 24 and the plane where the jet port 202 is located is greater than or equal to 20° and less than or equal to 70°.

[0067] In this embodiment, if the included angle between the swirl member 24 and the plane where the jet port 202 is located is too large, it will affect the smoothness of the air flow. If the included angle between the swirl member 24 and the plane where the jet port 202 is located is too small, the rotating air curtain will be weakened. Therefore, the included angle between the swirl member 24 and the plane where the jet port 202 is located is set to be greater than or equal to 20° and less than or equal to 70°, ensuring the effect of the rotatable air curtain, and thus ensuring the oil fume suction effect of the range hood.

[0068] In specific applications, the angle between the swirl member 24 and the plane where the jet orifice 202 is located can be set to 30°, 40°, 45°, 60°, etc.

[0069] Furthermore, as Figure 6 shown, the height H1 of the swirl member 24 is greater than or equal to 0.2 times and less than or equal to 0.3 times the height H2 of the first cavity 20.

[0070] In this embodiment, if the height H1 of the swirl member 24 is too high, it will generate too much resistance to the air flow in the first cavity 20, resulting in too much resistance in the first cavity 20 and uneven air pressure in the first cavity 20. If the height H1 of the swirl member 24 is too short, the guiding effect on the air flow will be weakened, which is not conducive to the generation of the rotating air curtain. Therefore, the height H1 of the swirl member 24 is designed to be greater than or equal to 0.2 times and less than or equal to 0.3 times the height H2 of the first cavity 20, which can not only generate the rotating air curtain but also reduce the influence of the setting of the swirl member 24 on the air pressure in the first cavity 20.

[0071] In specific applications, the swirl member 24 is arranged close to the jet orifice 202, and multiple swirl members 24 divide the jet orifice 202 into multiple sub-jet orifices, which not only reduces the influence on the stable air pressure in the upper space of the first cavity 20 but also facilitates the generation of the rotating air curtain.

[0072] Specifically, the height H1 of the swirl member 24 is designed to be any value among 0.22 times, 0.24 times, 0.25 times, and 0.26 times the height H2 of the first cavity 20.

[0073] Embodiment Five:

[0074] As Figure 5 、 Figure 8 and Figure 9 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: The range hood further includes: a plurality of flow guiding members 26 arranged in the second cavity 22, and the plurality of flow guiding members 26 are distributed along the circumferential direction of the second cavity 22. Among them, along the air outlet direction, the flow guiding member 26 includes a third end and a fourth end arranged oppositely, and from the third end to the fourth end of the flow guiding member 26, the flow guiding member 26 is inclined with respect to the center line 7 of the jet orifice.

[0075] In this embodiment, the range hood further includes a plurality of flow guiding members 26. The plurality of flow guiding members 26 are arranged in the second cavity 22 and distributed along the circumferential direction of the second cavity 22. Among them, the flow guiding member 26 includes a third end and a fourth end. The third end of the flow guiding member 26 is close to the air inlet end of the second cavity 22, and the fourth end of the flow guiding member 26 is close to the air outlet 222. In this way, when the range hood is turned on, the air flow flows from the third end of the flow guiding member 26 to the fourth end of the flow guiding member 26, and then flows out from the air outlet 222. Since the flow guiding member 26 is inclined relative to the center line 7 of the jet port, under the injection of the jet port 202, due to the negative pressure, the second cavity 22 can also discharge a rotating air curtain from the air outlet 222. The rotating air curtain discharged from the air outlet 222 acts together with the rotating air curtain ejected from the jet port 202, increasing the air volume of the rotating air curtain, thereby effectively converging the oil fume and improving the oil fume suction effect.

[0076] It should be noted that from the third end to the fourth end of the flow guiding member 26, the flow guiding member 26 is inclined relative to the center line 7 of the jet port, that is, along the circumferential direction of the first cavity 20, the first end of the swirl member 24 is located in front of or behind the second end of the swirl member 24, and thus can guide the air flow to rotate in the clockwise or counterclockwise direction along the second cavity 22 to form a rotating air curtain.

[0077] In specific applications, the plurality of flow guiding members 26 are equidistantly distributed or equally angularly distributed along the circumferential direction of the second cavity 22. Under the guidance of the flow guiding members 26, the air flow presents a uniform rotating air curtain form along the circumferential direction of the second cavity 22, and then acts together with the rotating air curtain ejected from the jet port 202, improving the effect of converging the oil fume. More specifically, the flow guiding member 26 is a flow guiding plate.

[0078] Embodiment Six:

[0079] As Figure 7 、 Figure 10 and Figure 11 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: both the first cavity 20 and the second cavity 22 are circular ring-shaped, and the inclination angle a2 of the flow guiding member 26 relative to the center line 7 of the jet port is the same as the inclination angle a1 of the swirl member 24 relative to the center line 7 of the jet port.

[0080] In this embodiment, the deflector 26 is inclined with respect to the center line 7 of the jet orifice, so that the airflow flowing out of the air outlet 222 presents a form of a rotating air curtain. The swirl member 24 is inclined with respect to the center line 7 of the jet orifice, so that the airflow flowing out of the jet orifice 202 presents a form of a rotating air curtain. Since the inclination angle a2 of the deflector 26 with respect to the center line 7 of the jet orifice is the same as the inclination angle a1 of the swirl member 24 with respect to the center line 7 of the jet orifice, the second cavity 22 can form a rotating air curtain with the same rotation direction and speed as the first cavity 20, thereby ensuring the overall wrapping degree of the rotating air curtain, and further improving the oil fume suction effect of the rotating air curtain.

[0081] Embodiment Seven:

[0082] As Figure 6 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: along the air outlet direction, the jet air duct 2 is gradually expanded. In the cross-section along the center line 7 of the jet orifice, the included angle a3 between the center line of the jet air duct 2 and the center line 7 of the jet orifice is greater than or equal to 0° and less than or equal to 30°, wherein the distances from the wall surfaces on the first side and the second side of the first cavity 20 to the center line of the jet air duct 2 are equal.

[0083] In this embodiment, along the air outlet direction, the jet air duct 2 is gradually expanded, that is, from the air inlet end of the first cavity 20 to the direction of the jet orifice 202 on the first cavity 20, the overall jet air duct formed by the first cavity 20 and the second cavity 22 is gradually expanded, thereby improving the oil fume wrapping effect and the oil fume suction ability. The jet air duct 2 has a center line, and the distances from the wall surface on the first side of the first cavity 20 and the wall surface on the second side of the first cavity 20 to the center line of the jet air duct 2 are equal, that is, the center line of the jet air duct 2 is located between the wall surface on the first side and the wall surface on the second side of the first cavity 20. Among them, the included angle a3 between the center line of the jet air duct 2 and the center line 7 of the jet orifice should not be too large, otherwise it will weaken the ability of the rotating air curtain to gather oil fume. The included angle a3 between the center line of the jet air duct 2 and the center line 7 of the jet orifice should not be too small, otherwise it will reduce the size of the air curtain formed by the jet orifice. Therefore, the included angle a3 between the center line of the jet air duct 2 and the center line 7 of the jet orifice is set to be greater than or equal to 0° and less than or equal to 30°. This setting method ensures the oil fume suction ability of the air curtain formed by the jet orifice 202.

[0084] It can be understood that the center line 7 of the jet orifice is also the center line of the annular structure surrounded by the jet orifice 202. Further, the center line 7 of the jet orifice coincides with the center line of the air suction port 102, that is, the jet air duct 2 and the air suction port 102 are concentrically arranged.

[0085] In specific applications, along the air outlet direction of the jet orifice 202, the jet air duct 2 is integrally in a trumpet shape.

[0086] Specifically, the included angle a3 between the center line of the jet air duct 2 and the center line 7 of the jet orifice is any value among 10°, 15°, 20°, and 25°.

[0087] Embodiment Eight:

[0088] As Figure 2 、 Figure 3 and Figure 4 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: The range hood further includes: a first fan 3, the first fan 3 is communicated with the suction air duct 10, and the first fan 3 sucks air through the suction air duct 10; a second fan 4, the second fan 4 is communicated with the first cavity 20, and the second fan 4 is used for exhausting air to the first cavity 20.

[0089] In this embodiment, the range hood includes a first fan 3 and a second fan 4. The first fan 3 is communicated with the suction air duct 10. After the first fan 3 is turned on, the cooking fumes enter the suction air duct 10 along with the air flow, and then are discharged out of the room, achieving the effect of exhausting cooking fumes. The second fan 4 is communicated with the first cavity 20 and is used for exhausting air into the first cavity 20. After the second fan 4 is turned on, the air flow is discharged into the first cavity 20 by the second fan 4, diffuses in the first cavity 20, and then is discharged from the jet orifice 202 of the first cavity 20. At the same time, under the action of the air flow ejected from the jet orifice 202, a negative pressure is formed around the jet orifice 202, so that the second cavity 22 exhausts air from the air outlet 222 under the action of the negative pressure, and together with the air flow ejected from the jet orifice 202, a large-volume air curtain is formed. The air curtain formed by the first cavity 20 and the second cavity 22 can effectively wrap the cooking fumes, avoid the diffusion of the cooking fumes, isolate the cooking fumes, and increase the cooking fume suction capacity.

[0090] Among them, the first fan 3 and the second fan 4 are respectively arranged corresponding to the suction air duct 10 and the jet air duct 2, so that the suction air duct 10 and the jet air duct 2 are separately arranged, that is, the air suction and air exhaust of the two do not interfere with each other. Furthermore, on the basis of the suction air duct 10 of an ordinary range hood, the cooking fume suction capacity is greatly improved. And because the second cavity 22 can form a natural convection air outlet under the injection of the jet orifice 202 of the first cavity 20, the power of the second fan 4 is reduced when the same air volume is satisfied, and thus the noise brought by the second fan 4 is reduced.

[0091] It should be noted that the second fan 4 first exhausts air into the annular first cavity 20, and then blows air through the relatively narrow jet port 202. On the one hand, it improves the flow distance of the ejected air flow and increases the height of the air curtain. On the other hand, due to the setting of the first cavity 20, the first cavity 20 plays a role in stabilizing the pressure, that is, the first cavity 20 is a pressure stabilizing cavity. The pressure stabilizing cavity quickly and evenly distributes the air with a certain positive pressure generated by the second fan 4 inside the pressure stabilizing cavity. When the air flow is ejected from the jet port 202, a wind curtain with a constant, uniform and stable speed can be formed.

[0092] Embodiment Nine:

[0093] According to an embodiment of the present invention, on the basis of the above embodiment, further: The first fan 3 is a centrifugal fan, and the second fan 4 is a mixed-flow fan or a centrifugal fan.

[0094] In this embodiment, the first fan 3 is used to suck air at the air suction port 102. Setting the first fan 3 as a centrifugal fan is beneficial to improving the air suction capacity. The second fan 4 is used to exhaust air into the first cavity 20 to generate an air curtain. Setting the second fan 4 as a mixed-flow fan is beneficial to increasing the air volume and reducing the noise. Of course, the second fan 4 can also be a mixed-flow fan.

[0095] Embodiment Ten:

[0096] As Figure 3 and Figure 4 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: The range hood further includes: a plurality of pipes 5, which are connected to the second fan 4 and the first cavity 20, and the plurality of pipes 5 are distributed along the circumferential direction of the first cavity 20.

[0097] In this embodiment, the range hood includes a plurality of pipes 5. The second fan 4 is connected to the first cavity 20 through the plurality of pipes 5. Under the action of the second fan 4, the air flow flows into the first cavity 20 through the pipes 5, and a stable-pressure air flow is formed in the first cavity 20, and then a stable rotating air curtain is formed after being ejected from the jet port 202. Among them, the plurality of pipes 5 are distributed along the circumferential direction of the first cavity 20, which speeds up the generation of a stable air pressure in the first cavity 20.

[0098] Specifically, the plurality of pipes 5 are evenly distributed along the circumferential direction of the first cavity 20. Further, the number of pipes 5 is 2 or 4, so that the resistance of the pipes 5 is relatively low, and at the same time, it is more conducive to realizing the uniformity degree of the pressure distribution in the first cavity 20.

[0099] Embodiment Eleven:

[0100] As Figure 2As shown, according to an embodiment of the present invention, based on the above embodiment, further: The range hood includes a side-suction range hood. The number of air intake ports 102 is two, and the number of jet air ducts 2 is two. The two air intake ports 102 are spaced apart, and the two jet air ducts 2 are respectively arranged corresponding to the two air intake ports 102. Among them, the number of the second fans 4 is one, and one second fan 4 communicates with the two jet air ducts 2, or the number of the second fans 4 is two, and the two second fans 4 respectively communicate with the two jet air ducts 2.

[0101] In this embodiment, the range hood includes a side-suction range hood. The number of both the jet air ducts 2 and the air intake ports 102 is two. The two air intake ports 102 are laterally arranged to adapt to the common double burners. A jet air duct 2 is arranged outside each air intake port 102, so as to form a rotating air curtain outside both of the two air intake ports 102, improving the oil fume suction effect. Among them, the number of the second fans 4 can be one or two. When the number of the second fans 4 is one, one second fan 4 communicates with the two jet air ducts 2 at the same time. This setting reduces the production cost and the noise caused by the operation of the second fan 4. When the number of the second fans 4 is two, the two second fans 4 respectively correspond to the two jet air ducts 2. This setting improves the air output of the jet air ducts 2.

[0102] Among them, setting the range hood as a side-suction range hood is beneficial to reducing the distance between the air intake port 102 of the range hood and the cooking range, thereby increasing the oil fume suction effect, and is more conducive to generating a rotating air curtain at low rotation speed and low noise. At the same time, since the distance of the rotating air curtain depends on the jet-to-suction ratio and the flow velocity of the jet orifice 202, the greater the velocity of the jet orifice 202, the farther the influence distance of its rotating air curtain; however, when the velocity of the jet orifice 202 becomes larger, a greater air volume is required, resulting in an increase in the power or rotation speed of the second fan 4 and an increase in noise. Therefore, reducing the height of the air intake port 102 also correspondingly reduces the height of the jet orifice 202, and further reduces the requirement for the influence distance of the rotating air curtain, reducing the noise problem caused by the rotating air curtain.

[0103] In another embodiment, the range hood further includes a top-suction range hood.

[0104] Embodiment Twelve:

[0105] As Figure 2 、 Figure 5 、 Figure 8 and Figure 9 shown, according to an embodiment of the present invention, based on the above embodiment, further: Among the two jet air ducts 2, the inclination direction of the swirl member 24 of one jet air duct 2 is different from the inclination direction of the swirl member 24 of the other jet air duct 2.

[0106] In this embodiment, in the two jet air ducts 2, the inclination direction of the swirl member 24 in one of the jet air ducts 2 is different from that of the swirl member 24 in the other jet air duct 2, so that the two jet air ducts 2 can form rotating air curtains in different directions, thereby wrapping the cooking fume to a greater extent and preventing the cooking fume from overflowing.

[0107] It can be understood that in the two jet air ducts 2, the inclination direction of the swirl member 24 in one jet air duct 2 is different from that of the swirl member 24 in the other jet air duct 2, that is, the swirl member 24 in one jet air duct 2 guides the air flow in the clockwise direction of the first cavity 20, and the swirl member 24 in the other jet air duct 2 guides the air flow in the counterclockwise direction of the first cavity 20, thereby forming rotating air curtains with different rotation directions in the two jet air ducts 2.

[0108] Embodiment Thirteen:

[0109] As Figure 1 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: an air inlet 224 is further provided on the frame 1, and the air inlet 224 is communicated with the second cavity 22.

[0110] In this embodiment, an air inlet 224 is further provided on the frame 1, and the air inlet 224 is communicated with the second cavity 22 to provide air flow for the second cavity 22, so that the second cavity 22 and the first cavity 20 can jointly form a rotating air curtain.

[0111] Further, a shutter is provided at the air inlet 224, or the air inlet 224 has a slot structure.

[0112] In this embodiment, a shutter is provided at the air inlet 224 to filter the air entering the second cavity 22 and ensure the cleanliness of the air. Or the air inlet 224 has a slot structure to filter the air entering the second cavity 22.

[0113] Embodiment Fourteen:

[0114] As Figure 3 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: the range hood further includes: a grille 6, which is covered on the air suction port 102.

[0115] In this embodiment, the range hood further includes a grille 6, and the grille 6 is covered outside the air suction port 102, which has the function of safety protection to prevent large particles of food from entering the air suction duct 10. At the same time, the grille 6 has the function of stabilizing the flow, making the air intake at the air suction port 102 more uniform, and having the function of separating cooking fume to a certain extent.

[0116] Embodiment Fifteen:

[0117] As Figure 6 and Figure 9 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: in the cross-section in the direction of the center line 7 of the jet orifice, the cross-section of the first cavity 20 is wing-shaped.

[0118] In this embodiment, in the cross-section in the direction of the center line 7 of the jet orifice, the cross-section of the first cavity 20 is wing-shaped, so that the airflow flows more smoothly, reducing the resistance of the airflow.

[0119] Embodiment XVI:

[0120] As Figure 6 shown, according to an embodiment of the present invention, on the basis of the above embodiment, further: the first cavity 20 and the second cavity 22 are circular ring-shaped, the jet orifice 202 is slit-shaped, and the width L1 of the slit is greater than or equal to 3 mm and less than or equal to 5 mm.

[0121] In this embodiment, both the first cavity 20 and the second cavity 22 are arranged in a circular ring shape. In this way, under the injection of the jet orifice 202 of the first cavity 20, the second cavity 22 discharges air from the air outlet 222 under the action of negative pressure, thereby increasing the air volume of the air curtain, improving the wrapping effect on the oil fume, and avoiding the diffusion of the oil fume. The jet orifice 202 is slit-shaped, thereby increasing the ejection speed of the airflow and increasing the flow distance of the airflow. Among them, the width L1 of the slit is greater than or equal to 3 mm and less than or equal to 5 mm, ensuring the air outlet effect.

[0122] In specific applications, the width L1 of the slit is equal to 3.5 mm, 3.6 mm, 3.8 mm, 4 mm, 4.5 mm, etc. More specifically, along the circumferential direction of the jet orifice 202, the width of the slit remains consistent, the slit is arranged in a ring shape, and the length of the slit is evenly distributed along the circumferential direction.

[0123] In another embodiment, the first cavity 20 and the second cavity 22 may also be other shapes, such as square, annular, angular, etc.

[0124] Further, the width L2 of the second cavity 22 is greater than or equal to 5 times the width L1 of the jet orifice 202 and less than or equal to 10 times the width L1 of the jet orifice 202.

[0125] In this embodiment, the width of the portion of the second cavity 22 through which the air flow passes should not be too large, as this is not conducive to the ejection of high-speed air flow and reduces the influence distance of the air curtain. Nor should it be too small, as this increases the air flow resistance. Therefore, the width L2 of the second cavity 22 is set to be greater than or equal to 5 times the width L1 of the jet orifice 202 and less than or equal to 10 times the width L1 of the jet orifice 202, thus ensuring the influence distance of the air curtain and reducing the air flow resistance.

[0126] It can be understood that the width L1 of the jet orifice 202, that is, the width of the portion of the jet orifice 202 through which the air flow is ejected, is also the flow-through width.

[0127] Furthermore, the ratio of the diameter of the wall surface on the second side of the first cavity 20 to the diameter of the suction port 102 is greater than or equal to 3 and less than or equal to 10.

[0128] In this embodiment, setting the ratio of the diameter of the annular structure formed by the outer wall surface of the first cavity 20 to the diameter of the suction port 102 within a reasonable range is conducive to improving the wrapping performance of the air curtain around the oil fume and preventing the oil fume from spreading.

[0129] In specific applications, the ratio of the diameter of the wall surface on the second side of the first cavity 20 to the diameter of the suction port 102 is any value among 4, 5, 6, and 8.

[0130] Embodiment Seventeen:

[0131] According to a specific embodiment of the present invention, the present invention provides an oil fume extractor, which includes a frame 1 and a jet air duct 2. An air suction duct 10 is provided inside the frame 1, and a suction port 102 is provided on the air suction duct 10. The jet air duct 2 includes a first cavity 20 and a second cavity 22. The first cavity 20 is used to discharge jet air, and the second cavity 22 forms an air multiplication area under the action of the first cavity 20, increasing the air output and reducing the power of the second fan 4.

[0132] Among them, the air supply mode of the first cavity 20 adopts an air supply mode similar to that of a bladeless fan, which, in combination with the independent air suction duct 10, achieves a powerful tornado oil fume suction effect. It can significantly improve the oil fume suction effect (compared with traditional oil fume extractors, it can achieve a large suction oil fume effect under low suction and low air volume conditions), while reducing the noise problem caused by the jet air duct 2 and preventing the oil fume from overflowing through the rotating air curtain.

[0133] Furthermore, the present invention adopts a side-suction double-suction port tornado form, that is, two suction ports 102 and two jet air ducts 2. The side-suction range hood has less requirement for the influence distance of the rotating air curtain, and can adopt a lower jet air volume and suction air volume. With the side-suction range hood, the suction port 102 and the jet air duct 2 are arranged laterally, which is beneficial to reducing the distance between the suction port 102 of the range hood and the cooking stove, thereby increasing the oil fume suction effect, and at the same time reducing the distance requirement of the rotating air curtain, which is more conducive to forming the rotating air curtain at low speed and low noise. The influence distance of the rotating air curtain depends on the jet-to-suction ratio and the flow velocity of the jet orifice 202. The greater the air flow velocity of the jet orifice 202, the farther the influence distance of its rotating air curtain; however, when the speed of the jet orifice 202 increases, a larger air volume and fan power or rotational speed increase are required, resulting in an increase in noise. Furthermore, the side-suction double-suction port tornado designed by the present invention has an external dimension similar to that of a traditional side-suction range hood, and will not increase a large space to affect the normal operation space of users.

[0134] Of course, the range hood proposed in this application is not limited to the side-suction range hood, and this invention can also be used in the top-suction range hood, and the structural complexity and ease of implementation are relatively good in the top-suction form.

[0135] Furthermore, the design of the left and right tornado suction ports is convenient for users' actual use (usually there are double burners in a family). An independent jet air duct 2 and a suction air duct 10 are arranged inside a single tornado suction port, and the two do not interfere with each other. The suction of the suction air duct 10 is provided by a centrifugal fan, and the suction provided by the centrifugal fan is evenly distributed on the left and right suction ports 102 through the independent suction air duct 10. A grille 6 is arranged on the suction port 102 to prevent large pieces of food or residues from entering the suction air duct 10, and at the same time has a safety protection function and a certain oil fume filtering function.

[0136] Two independent mixed-flow fans are used in the jet air duct 2 to supply air to the left and right jet air ducts 2 respectively. The mixed-flow fan sends a certain wind pressure into the first cavity 20 through a pipeline 5. The first cavity 20 adopts an annular structure, is hollow inside and has very little circumferential flow, which is convenient for generating a stable annular pressure cavity; an annular long and narrow jet orifice 202 is arranged outside the first cavity 20, and the jet orifice 202 is in a slit shape, and its slit width is preferably about 2 mm to 5 mm (too large is not conducive to the formation of stable pressure in the first cavity 20, and too small is not conducive to forming a high-speed and high-quality air curtain). The swirl elements 24 are arranged at equal angles at equal intervals between the slits, thereby forming a rotating air curtain. A second cavity 22 is arranged on the inner side or the outer side of the first cavity 20, and a guide element 26 with the same angle as the swirl element 24 is arranged therein. By spraying high-speed jets through the jet orifice 202, the air at the position of the second cavity 22 is driven, thereby forming an air multiplier to achieve the effect of a large air volume at a low air volume.

[0137] Furthermore, the frame 1 includes a housing and a panel, and the jet air duct 2 is arranged between the air suction port 102 and the panel.

[0138] Furthermore, the jet air duct 2 is in a horn shape, and the opening angle a3 thereof is 0° to 30°. Specifically, the opening angle a3 is 15°. When the opening angle a3 is 0°, it means that the jet air duct 2 is in a parallel layout.

[0139] Furthermore, the ratio of the outer diameter dimension of the jet air duct 2 to the diameter of the air suction port 102 is about 3 times. Usually, the maximum outer diameter dimension of the jet air duct 2 does not exceed 450 mm; the perpendicular distance between the plane of the jet orifice 202 and the plane of the air suction port 102 along the center line direction of the suction port is about 0.5 times. The frame 1 is provided with a louver or hole slot structure to provide clean air exchange for the second cavity 22. The swirl members 24 on the left and right sides are symmetrically arranged, and their swirl directions are opposite. There is a matching relationship between the jet air volume of the jet orifice 202 and the air suction volume of the air suction port 102. There is a matching relationship between the jet air volume of the jet orifice 202 and the air suction volume of the air suction port 102 under different gears.

[0140] In the present invention, the term "a plurality of" means two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0141] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0142] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil fume suction machine, characterized in that, Comprising: A frame, within which an air suction duct is provided, and an air suction port is provided on the air suction duct; An air jet duct, which includes: A first cavity, connected to the frame, the first cavity being disposed around the air suction port, and a jet port being provided on the first cavity; A second cavity, the second cavity being disposed on at least one of the first side and the second side of the first cavity, and an air outlet being provided on the second cavity; A plurality of flow guiding members, disposed within the second cavity, the plurality of flow guiding members being distributed along the circumferential direction of the second cavity, wherein, along the air outlet direction, the flow guiding member includes a third end and a fourth end which are oppositely arranged, and from the third end of the flow guiding member to the fourth end of the flow guiding member, the flow guiding member is inclined with respect to the center line of the jet port; When the first cavity ejects air flow, a negative pressure is formed around the first cavity, so that the second cavity located around the first cavity can exhaust air from the air outlet under the action of the negative pressure.

2. The range hood according to claim 1, wherein Along the air outlet direction of the first cavity, the distance between the wall surface on the first side of the first cavity and the wall surface on the second side gradually decreases.

3. The range hood according to claim 1, wherein, The air jet duct further includes: A plurality of swirl members, disposed within the first cavity, the plurality of swirl members being distributed along the circumferential direction of the first cavity, wherein, along the air outlet direction, the swirl member includes a first end and a second end which are oppositely arranged, and from the first end of the swirl member to the second end of the swirl member, the swirl member is inclined with respect to the center line of the jet port.

4. The range hood according to claim 3, wherein The inclination angle of the swirl member with respect to the center line of the jet port is greater than or equal to 10° and less than or equal to 30°; and / or The angle between the swirl member and the plane where the jet port is located is greater than or equal to 20° and less than or equal to 70°; and / or The height of the swirl member is greater than or equal to 0.2 times the height of the first cavity and less than or equal to 0.3 times the height of the first cavity.

5. The range hood according to claim 3, wherein The inclination angle of the flow guiding member with respect to the center line of the jet port is the same as the inclination angle of the swirl member with respect to the center line of the jet port.

6. The range hood according to any one of claims 1 to 5, wherein Along the air outlet direction, the air jet duct is gradually expanded, and in the cross-section along the center line of the jet port, the angle between the center line of the air jet duct and the center line of the jet port is greater than or equal to 0° and less than or equal to 30°, wherein, the distances between the wall surfaces on the first side and the second side of the first cavity and the center line of the air jet duct are equal.

7. The range hood according to any one of claims 1 to 5, characterized in that, Further comprising: A first fan, the first fan being communicated with the air suction duct, and the first fan sucking air through the air suction duct; A second fan, the second fan being communicated with the first cavity, and the second fan being used for exhausting air to the first cavity.

8. The range hood according to claim 7, wherein The first fan is a centrifugal fan, and the second fan is a mixed flow fan or a centrifugal fan.

9. The range hood according to claim 7, wherein Further comprising: A plurality of pipes, communicating with the second fan and the first cavity, and the plurality of pipes are distributed circumferentially along the first cavity.

10. The range hood according to claim 7, wherein the range hood includes a side suction range hood, the number of the air inlets is two, the number of the jet air ducts is two, the two air inlets are spaced apart, and the two jet air ducts are respectively arranged corresponding to the two air inlets; wherein, the number of the second fans is one, and one second fan communicates with the two jet air ducts, or the number of the second fans is two, and the two second fans respectively communicate with the two jet air ducts.

11. The range hood according to claim 10, wherein among the two jet air ducts, the inclination direction of the swirl member of one jet air duct is different from the inclination direction of the swirl member of the other jet air duct.

12. The range hood according to any one of claims 1 to 5, wherein an air inlet is further provided on the frame, and the air inlet communicates with the second cavity.

13. The range hood according to any one of claims 1 to 5, wherein in the cross-section in the center line direction of the jet orifice, the cross-section of the first cavity is wing-shaped.

14. The range hood according to any one of claims 1 to 5, wherein the first cavity and the second cavity are annular, the jet orifice is slit-shaped, the width of the slit is greater than or equal to 3 mm and less than or equal to 5 mm; the width of the second cavity is greater than or equal to 5 times the width of the jet orifice and less than or equal to 10 times the width of the jet orifice; the ratio of the diameter of the wall surface on the second side of the first cavity to the diameter of the air inlet is greater than or equal to 3 and less than or equal to 10.

Images