CN110500633B

CN110500633B - Smoke exhaust ventilator

Info

Publication number: CN110500633B
Application number: CN201910780754.6A
Authority: CN
Inventors: 谢川川; 蓝渊; 张辉; 马世涛; 汪耀东
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2021-06-18
Anticipated expiration: 2039-08-22
Also published as: CN110500633A

Abstract

The invention discloses a range hood, comprising: the air conditioner comprises a main shell, a fan and a fan, wherein the main shell is provided with an air inlet and an air outlet; the air outlet device comprises an air outlet source, an air outlet guide pipe and an injection pipe, the injection pipe is positioned below the main shell, at least part of the top wall of the injection pipe is spaced from the bottom wall of the main shell, and the air outlet source guides airflow to the injection pipe through the air outlet guide pipe; the injection pipe is provided with an upstream end and a downstream end in the smoke flowing direction, the injection pipe is provided with a jet orifice which injects air towards the downstream end to form an injection flow field, the jet orifice comprises a top jet orifice positioned on the top wall of the injection pipe and a bottom jet orifice positioned on the bottom wall of the injection pipe, at least part of the upper surface of the injection pipe positioned between the top jet orifice and the downstream end is a coanda surface, and at least part of the lower surface of the injection pipe positioned between the bottom jet orifice and the downstream end is a coanda surface. According to the range hood provided by the embodiment of the invention, the oil smoke absorption effect of the range hood can be improved.

Description

Smoke exhaust ventilator

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a range hood.

Background

The range hood has become one of the essential household appliances in the household kitchen at present. The range hood is mainly used for exhausting harmful gases such as oil smoke generated in the cooking process and maintaining the human health and the indoor air quality.

In order to achieve a better oil fume absorption effect and prevent the generation of a fume leakage phenomenon, the design of an improved impeller is mainly used, and the air quantity or air pressure redundancy of a main fan is improved as a main means to ensure that the oil fume absorption performance can be ensured by enough capacity even if the performance of the fan is attenuated. Although the method can effectively improve the oil smoke absorption effect, certain disadvantages are brought, such as obvious increase of power consumption caused by the increase of fan power, influence of noise increase on user experience, and the like. Therefore, the existing range hood has larger improvement space.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the range hood which can improve the oil fume suction effect of the range hood.

The range hood according to the embodiment of the invention comprises: a main housing having an air inlet and an air outlet; the air outlet device comprises an air outlet source, an air outlet guide pipe and an ejector pipe, the ejector pipe is positioned below the main shell, at least part of the top wall of the ejector pipe is spaced from the bottom wall of the main shell, and the air outlet source guides airflow to the ejector pipe through the air outlet guide pipe; the injection pipe is provided with an upstream end and a downstream end in the smoke flowing direction, the injection pipe is provided with a jet orifice which jets air towards the downstream end to form an injection flow field, the jet orifice comprises a top jet orifice positioned on the top wall of the injection pipe and a bottom jet orifice positioned on the bottom wall of the injection pipe, at least part of the upper surface of the injection pipe positioned between the top jet orifice and the downstream end is a coanda surface, and at least part of the lower surface of the injection pipe positioned between the bottom jet orifice and the downstream end is a coanda surface.

According to the range hood provided by the embodiment of the invention, the air outlet device is arranged and comprises the ejector pipe, the ejector pipe is provided with the jet orifice for jetting airflow towards the downstream end, at least part of the upper surface of the ejector pipe, which is positioned between the top jet orifice and the downstream end, is a coanda surface, and at least part of the lower surface of the ejector pipe, which is positioned between the bottom jet orifice and the downstream end, is a coanda surface, so that the matching of an ejection effect and the coanda effect is formed, the smoke at the upstream of the ejector pipe can be strongly attracted to the air inlet, the smoke to escape from the outer side of the main shell flows to the air inlet, and the defect that the existing range hood is insufficient in suction force of the escaping smoke at the outer side of the main. Therefore, the phenomenon that the range hood is easy to leak smoke is reduced, the smoke absorption effect of the range hood is further improved, and the health of a human body is protected. And even if the air quantity of the main fan is insufficient, the arrangement of the air outlet device can also reduce the smoke leakage phenomenon, so that the air quantity requirement of the range hood on the main fan is greatly reduced while the oil smoke absorption effect is ensured, and the range hood can properly lower the rotating speed of the main fan under reasonable arrangement, thereby greatly reducing the power consumption of the range hood and being beneficial to energy conservation and environmental protection. In addition, if the range hood can properly reduce the rotating speed of the main fan, the overall noise of the range hood can be obviously reduced, and compared with the traditional range hood, the range hood has the advantage that the noise is obviously reduced under the condition of ensuring the same range hood effect.

In some embodiments, the ejector tube includes an outer wall plate and an inner wall plate disposed opposite to each other, a middle portion of the outer wall plate is bent in a direction away from the inner wall plate to form the upstream end, a middle portion of the inner wall plate is bent in a direction away from the outer wall plate to form the downstream end, a portion of the inner wall plate adjacent to the upstream end extends between an upper end and a lower end of the outer wall plate, the upper end of the outer wall plate and the inner wall plate define the top nozzle therebetween, and the lower end of the outer wall plate and the inner wall plate define the bottom nozzle therebetween.

Specifically, on the pipe section of the injection pipe, a connecting line of an upstream end and a downstream end of the injection pipe is used as an X axis, and the outer wall plate and the inner wall plate are symmetrically arranged relative to the X axis.

Further, the maximum distance of the outer wall plate in the X axis direction is L1, the maximum distance of the outer wall plate in the direction perpendicular to the X axis direction is H1, and the ratio of H1 to L1 is 0.5-2.

In some embodiments, the outer wall panel comprises an outer wall outer surface and an outer wall inner surface towards the downstream end, at least part of the outer wall inner surface being gradually convex in a direction towards the X axis, and the outer wall inner surface forming a convex tip at the X axis that is convex towards the downstream end.

In some optional embodiments, the inner wall panel has a distance H21 between upper and lower portions nearest the upstream end, the distance between the upper and lower portions of the inner wall panel increases gradually in a direction toward the downstream end, and the distance between the upper and lower portions of the inner wall panel reaches a maximum at the injection port, after which the upper and lower portions of the inner wall panel smoothly extend toward the X axis until the upper and lower portions of the inner wall panel intersect the X axis at the downstream end, wherein the maximum dimension of the inner wall panel in a direction perpendicular to the X axis is H22, and H21 is 0.7 to 1 times H22.

In some alternative embodiments, the outer surface of the inner wall panel from the jet opening to the downstream end is a coanda surface.

In some alternative embodiments, the outer surface of the outer wall panel is smoothly curved.

In some optional embodiments, the X axis is disposed along a horizontal plane, or the X axis is disposed inclined upward, and the angle of the upward inclination of the X axis does not exceed 20 degrees of the horizontal plane.

In some embodiments, the top nozzle and the bottom nozzle are both slits extending in the horizontal direction, and a plurality of flow guide spacing ribs are arranged in the top nozzle and the bottom nozzle.

Further, the distance between the diversion spacing ribs is 10-15 times of the height size of the strip seam.

In some embodiments, the bottom of the main housing is formed into a smoke collecting hood, the ejector pipe is arranged at the bottom of the smoke collecting hood and close to the outer edge of the smoke collecting hood, the horizontal projection of the ejector pipe is located in the horizontal projection of the smoke collecting hood, the distance between the top wall of the ejector pipe and the bottom wall of the smoke collecting hood is 30-50mm, and the distance between the upstream end of the ejector pipe and the outer edge of the smoke collecting hood is 0-100 mm.

In some embodiments, the air outlet source is located on the top wall of the main housing and above the main fan of the range hood, and the air outlet duct includes: the upper guide section is positioned above a main fan of the range hood and is connected with the air outlet source, and the upper guide section is horizontally arranged; the two downward extending sections are vertically arranged in the main shell, and two ends of the upper guide section are respectively connected with one downward extending section; the two branch sections are respectively connected with the bottoms of the downward extending sections, extend towards directions far away from each other, and are connected with the injection pipe.

In particular, the branching section gradually increases in flow area in a direction away from the downwardly extending section.

In some embodiments, the ejector pipes are disposed on two opposite sides of the lower portion of the main housing, or the ejector pipes are disposed on three adjacent sides of the lower portion of the main housing, or the ejector pipes are annular and disposed on four lower sides of the main housing, and each of the branch sections is connected to the ejector pipe through at least one transition pipe.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a front view of a range hood in accordance with one embodiment of the present invention;

fig. 2 is a partially enlarged view of the air outlet device and the fume collecting hood shown in fig. 1;

fig. 3 is a partial schematic view of the air outlet device and the smoke collecting hood shown in fig. 1;

FIG. 4 is a schematic view of the structure shown in FIG. 3 illustrating the flow direction of the smoke when the range hood is in use;

FIG. 5 is a partial schematic view of an eductor tube and transition tube according to one embodiment of the present invention;

FIG. 6 is a schematic view of the structure shown in FIG. 5 illustrating the flow direction of the smoke when the range hood is in use;

FIG. 7 is a schematic diagram of the relative positions of the structures shown in FIG. 5;

FIG. 8 is a partial schematic view of an eductor tube according to an embodiment of the present invention;

fig. 9 is a perspective view of an air outlet device according to an embodiment of the present invention.

Reference numerals:

a range hood 100,

A main shell 1, an air inlet 11, a negative pressure zone 111, an air outlet 12, a fume collecting hood 13, an exhaust fan 14,

The air outlet device 2, the air outlet source 21, the air outlet guide pipe 22, the upper guide section 221, the downward extension section 222, the branch section 223, the transition pipe 224, the ejector pipe 23, the upstream end a, the downstream end B, the injection port 231, the top nozzle 2311, the bottom nozzle 2312, the outer wall plate 232, the convex tip 2321, the inner wall plate 233, the strip seam 234 and the flow guide spacing rib 235.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "back", "top", "bottom", "inner", "outer", "lateral", "horizontal", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are used merely to facilitate the description of the present invention and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A range hood 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 9.

As shown in fig. 1 and 2, a range hood 100 according to an embodiment of the present invention includes: main casing 1 and air-out device 2. The main housing 1 has an air inlet 11 and an air outlet 12. The air outlet device 2 comprises an air outlet source 21, an air outlet guide pipe 22 and an injection pipe 23, the injection pipe 23 is positioned below the main shell 1, at least part of the top wall of the injection pipe is spaced from the bottom wall of the main shell 1, and the air outlet source 21 guides airflow to the injection pipe 23 through the air outlet guide pipe 22. As shown in fig. 3 and 4, the ejector pipe 23 has an upstream end a and a downstream end B in the flue gas flowing direction, the ejector pipe 23 is provided with an ejection port 231 for ejecting air toward the downstream end B to form an ejector flow field, the ejection port 231 includes a top ejection port 2311 located on the top wall of the ejector pipe 23 and a bottom ejection port 2312 located on the bottom wall of the ejector pipe 23, at least a part of the upper surface of the ejector pipe 23 located between the top ejection port 2311 and the downstream end B is a coanda surface, and at least a part of the lower surface of the ejector pipe 23 located between the bottom ejection port 2312 and the downstream end B is an coanda surface.

It can be understood that, in the cooking process, the cookers and the cookers below the range hood 100 generate a large amount of oil smoke, and the oil smoke rapidly rises under the action of buoyancy and spreads around in the rising process. The main fan of the range hood 100 is an exhaust fan 14, the exhaust fan 14 sucks the airflow from the air inlet 11 and discharges the airflow from the air outlet 12, and when the airflow encounters a cold wall (such as a condensation plate), a filter screen (not shown) and other components in the flowing process, oil droplets in the airflow are easy to separate out and separate.

Under the driving effect of the main blower, a negative pressure region 111 is formed near the air inlet 11, and the negative pressure region 111 has a relatively large negative pressure, so that the oil smoke generated by the kitchen range and the cooker can be attracted to the air inlet 11 and enter the range hood 100. Of course, the negative pressure field distribution is influenced by the operation state of the main fan and the structure of the range hood 100, and the negative pressure is usually strongest at the area directly opposite to the air inlet 11. In some embodiments, the bottom of the main housing 1 is provided with a smoke collecting hood 13, a condensation plate and other components, and the outline of the area with the strongest negative pressure affected by the components becomes larger.

The range hood 100 of the embodiment of the present invention further includes an air outlet device 2 in addition to the exhaust fan 14, and the air outlet device 2 forms an air outlet flow by using the air outlet source 21. When the air outlet source 21 adopts a fan for air outlet, the range hood 100 becomes a double-fan system, wherein one fan sucks air from the air inlet 11, and the other fan blows air to the negative pressure area 111 formed by the air inlet 11. Of course, the air outlet 21 may be implemented by other devices (e.g., an air compressor). The air outlet source 21 guides the air flow to the injection pipe 23 through the air outlet guide pipe 22, so that the injection port 231 can inject the air flow, and the injected air flow can inject air in the direction of flowing of the flue gas to form an injection flow field.

It can be understood that when the amount of soot is large, the negative pressure region 111 cannot completely suck the soot to the air inlet 11, and part of the soot is diffused toward both sides of the range hood and tries to escape from both sides. When the oil smoke is diffused to the vicinity of the air outlet device 2, due to the entrainment and ejection effects of the air flow at the injection port 231, the oil smoke diffused outward can be forcibly changed in the movement direction by the air flow generated by the air outlet device 2 and directed toward the negative pressure region 111, and the oil smoke is changed from outward movement to inward movement, and then the oil smoke is conveyed to the negative pressure region 111 again, so that the leakage of the oil smoke can be reduced as much as possible.

In the invention, the injection pipe 23 is provided with the injection port 231 for injecting air towards the downstream end B to form an injection flow field, the injection port 231 comprises a top nozzle 2311 positioned on the top wall of the injection pipe 23 and a bottom nozzle 2312 positioned on the bottom wall of the injection pipe 23, at least part of the upper surface of the injection pipe 23 positioned between the top nozzle 2311 and the downstream end B is a coanda surface, and at least part of the lower surface of the injection pipe 23 positioned between the bottom nozzle 2312 and the downstream end B is a coanda surface, so that the air flow outside the injection pipe 23 can be more splashed and converged towards the negative pressure area 111, and especially, a large amount of air flow to be diffused towards the outer side of the range hood 100 can be sucked to the negative pressure area 111.

Specifically, the coanda surfaces can produce a coanda effect, i.e., a tendency for the fluid (water or air) to deviate from its original direction of flow and instead follow the surface of a protruding object. As shown in fig. 3 and 4, the upper surface of the ejector pipe 23 between the top nozzle 2311 and the downstream end B is a coanda surface, and when the top nozzle 2311 jets air to the downstream end B, the air flow is adsorbed to the downstream end B along the upper surface, and because the upper surface is the coanda surface, the air flow above the upper surface is attracted, so that the air flow above the jetted air flow and upstream of the top nozzle 2311 are attracted to the coanda surface and mixed with the jetted air flow, and flow along the coanda surface to the downstream end B. In the embodiment of the invention, the injection pipe 23 is positioned below the main shell 1 and is spaced from the bottom wall of the main shell 1, the outer side of the main shell 1 is communicated with the area above the top wall, and the airflow injected by the top nozzle 2311 can entrain the air at the upstream and the upper part under the action of the coanda effect, so that the smoke at the outer side of the main shell 1 can be continuously entrained by the injected airflow and injected to the downstream end B.

As also shown in fig. 3 and 4, the lower surface of the ejector pipe 23 between the bottom nozzle 2312 and the downstream end B is a coanda surface, and when the bottom nozzle 2312 jets air towards the downstream end B, the air flow is adsorbed to be jetted towards the downstream end B along the lower surface, so that the air flow flowing downwards from the jet air flow and upstream from the bottom nozzle 2312 is also adsorbed and coiled onto the coanda surface, and thus the flue gas outside the main casing 1 can be continuously entrained by the jet air flow to be jetted towards the downstream end B.

As shown in fig. 6, the airflows jetted from the top nozzle 2311 and the bottom nozzle 2312 are converged at the downstream end B under the guidance of the coanda surface and then jetted, the flow rate of the converged airflow is large, the direction is consistent, and not only is the formed jetting flow field adsorbed to the surrounding airflow, but also a very strong negative pressure can be generated at the upstream of the jet orifice 231, so that the flue gas at the upstream of the jet orifice 231 can be strongly adsorbed and flow to the negative pressure region 111. The cooperation of the injection flow field and the coanda effect is very clear to the suction area, so that the smoke outside the injection pipe 23 is better sucked to flow to the air inlet 11. The suction effect makes up for the defect that the negative pressure area 111 generated by the existing air inlet 11 is insufficient to suck the outer side of the main shell 1.

According to the range hood 100 provided by the embodiment of the invention, the air outlet device 2 is arranged, the air outlet device 2 comprises the ejector pipe 23, the ejector pipe 23 is provided with the top nozzle 2311 and the bottom nozzle 2312 which spray airflow towards the downstream end B, at least part of the upper surface of the ejector pipe 23, which is positioned between the top nozzle 2311 and the downstream end B, is a coanda surface, and at least part of the lower surface of the ejector pipe 23, which is positioned between the bottom nozzle 2312 and the downstream end B, is a coanda surface, so that the cooperation of an ejector effect and the coanda effect is formed, smoke at the upstream of the ejector pipe 23 can be strongly attracted to the air inlet 11, the smoke to be escaped at the outer side of the main shell 1 flows to the air inlet 11, and the defect that the existing range hood has insufficient suction force for the escaped smoke at the outer side. Therefore, the phenomenon that the range hood 100 is easy to leak smoke is reduced, the smoke absorption effect of the range hood 100 is further improved, and the health of a human body is protected. And even if the air quantity of the main fan is insufficient, the arrangement of the air outlet device 2 can also reduce the smoke leakage phenomenon, so that the air quantity requirement of the range hood 100 on the main fan is greatly reduced while the oil smoke absorption effect is ensured, and the range hood 100 can properly reduce the rotating speed of the main fan under reasonable arrangement, thereby greatly reducing the power consumption of the range hood and being beneficial to energy conservation and environmental protection. In addition, if the range hood 100 can properly reduce the rotating speed of the main fan, the overall noise of the range hood can be significantly reduced, and compared with the traditional range hood, the noise is significantly reduced under the condition of ensuring the same range hood effect.

In some embodiments, as shown in fig. 3 and 4, the ejector tube 23 includes an outer wall panel 232 and an inner wall panel 233 that are disposed opposite one another, a middle portion of the outer wall panel 232 being bent away from the inner wall panel 233 to form an upstream end a, a middle portion of the inner wall panel 233 being bent away from the outer wall panel 232 to form a downstream end B, a portion of the inner wall panel 233 adjacent to the upstream end a extending between an upper end and a lower end of the outer wall panel 232, a top nozzle 2311 being defined between the upper end of the outer wall panel 232 and the inner wall panel 233, and a bottom nozzle 2312 being defined between the lower end of the outer wall panel 232 and the inner wall panel 233. It will be appreciated that a portion of the inner wall plate 233 adjacent to the upstream end a is provided to extend between the upper and lower ends of the outer wall plate 232, so that the inner wall plate 233 extending to the upper and lower ends of the outer wall plate 232 can function to guide the air flow. Specifically, after entering the ejector pipe 23, the airflow sent from the air outlet duct 22 flows out of the top nozzle 2311 and the top nozzle 2311 under the guidance of the outer wall plate 232 and the inner wall plate 233.

Specifically, as shown in fig. 5 to 7, in the pipe cross section of the ejector pipe 23, the outer wall plate 232 and the inner wall plate 233 are symmetrically arranged with respect to the X axis, with the line connecting the upstream end a and the downstream end B of the ejector pipe 23 as the X axis. The outer wall plate 232 and the inner wall plate 233 which are symmetrically arranged relative to the X axis can enable the air outlet rate and the air volume of the top nozzle 2311 and the bottom nozzle 2312 to be equivalent, so that a better injection flow field can be formed, and the air flow in the upper area of the top wall and the lower area of the bottom wall of the injection pipe 23 can flow towards the negative pressure area 111 in a consistent direction.

Further, as shown in fig. 5-7, the maximum distance of the outer wall plate 232 in the X-axis direction is L1, the maximum distance of the outer wall plate 232 in the direction perpendicular to the X-axis direction is H1, and the ratio of H1 to L1 is between 0.5 and 2. Therefore, the outer wall plate 232 forms reasonable curvature, and when the air flow in the injection pipe 23 is injected after being bent along the outer wall plate 232, the pressure drop loss is small, and the injection flow speed is high.

In some embodiments, as shown in fig. 5-7, the outer wall panel 232 includes an outer wall outer surface and an outer wall inner surface toward the downstream end, at least a portion of the outer wall inner surface being gradually convex in a direction toward the X axis, and the outer wall inner surface forming a convex tip at the X axis that is convex toward the downstream end. . Like this the outer wall plate 232 can play the effect of guide inside air current, reduce the vortex, improves and draws the effect of drawing of penetrating pipe 23.

In some alternative embodiments, as shown in fig. 5 to 7, the distance between the upper and lower portions of the inner wall plate 233 nearest to the upstream end a is H21, the distance between the upper and lower portions of the inner wall plate 233 gradually increases in the direction toward the downstream end B, and the distance between the upper and lower portions of the inner wall plate 233 reaches the maximum at the ejection port 231, after which the upper and lower portions of the inner wall plate 233 smoothly extend toward the X axis until the upper and lower portions of the inner wall plate 233 intersect the X axis at the downstream end B, wherein the maximum dimension of the inner wall plate 233 in the direction perpendicular to the X axis is H22, and H21 is 0.7 to 1 times that of H22. Therefore, the air flow in the inner wall plate 233 flows along the inner wall plate 233 to the tapered air duct formed by the outer wall plate 232 and the inner wall plate 233, the air flow is smoother, the generation of vortex is avoided, and the internal consumption of the air flow is reduced. In addition, the inner wall plate 233 forms a vertically symmetrical wing-shaped air duct structure, and thus, the resistance to the externally guided airflow is small.

In some alternative embodiments, as shown in fig. 5 to 7, the outer surface of the inner wall plate 233 from the ejection port 231 to the downstream end B is a coanda surface. It can be understood that, when the soot escapes from the periphery of the negative pressure region 111 to the outside, part of the soot contacts the lower surface of the inner wall plate 233, and the soot easily flows toward the negative pressure region 111 along the lower surface of the inner wall plate 233 by the dual action of the jet effect and the coanda effect; when part of the soot is diffused upward around the lower surface of the inner wall plate 233, it is easily sucked by the negative pressure field formed on the upper surface of the inner wall plate 233, and the smoke flows toward the negative pressure region 111 along the upper surface of the inner wall plate 233. Through the upper and lower dual injection and suction effects of the air outlet device 2, the oil smoke diffusing outwards can be sucked into the negative pressure region 111 as much as possible.

In some alternative embodiments, as shown in FIG. 6, the outer surface of outer wall panel 232 is smoothly curved. The smooth arc surface is beneficial to smooth air flow flowing through the outer wall plate 232, so that the resistance of the outer wall plate 232 to the air flow is reduced, and the air flow can flow to the negative pressure region 111 as far as possible.

In some alternative embodiments, as shown in FIG. 7, the X axis is disposed along a horizontal plane, or the X axis is disposed with an upward inclination, and the upward inclination angle of the X axis does not exceed 20 degrees from the horizontal plane. That is, the injection port 231 may inject in a horizontal direction, and the injection direction of the injection port 231 may be slightly inclined upward, but the injection direction of the injection port 231 may not exceed the horizontal plane by 20 degrees. The smoke suction force formed by the dual functions of the ejection effect and the coanda effect can be radiated to the upstream area of the ejection pipe 23 along the opposite direction of ejection, and by taking the ejection port 231 to eject along the horizontal direction as an example, the smoke suction force can well suck the smoke outside the horizontal direction of the ejection pipe 23 to the negative pressure area 111, so that the smoke suction range can be expanded on the premise of not reducing the negative pressure of the negative pressure area 111.

In some embodiments, as shown in fig. 8, the top nozzle 2311 and the bottom nozzle 2312 are both horizontally extending slits 234, which allow the smoke outside the ejector pipe 23, even outside the main housing 1, to better flow toward the negative pressure region 111. Of course, in other embodiments, the extending direction of the slit 234 may be inclined to the horizontal plane, or the slit 324 may be arranged to extend along a wavy line, which is not limited herein.

Specifically, as shown in FIG. 7, the height of the slots 234 is d, which ranges from 1mm to 3 mm. The slots 234 are thus of a suitable height to eject the air stream for good ejection. It should be noted that, when the height of the nozzle 2311 or the slit 2312 is between 1mm and 3mm, the slit 2312 can enable the airflow to be ejected evenly, so that the airflow can generate a powerful jet entrainment effect, and the rigidity of the ejection pipe 23 can be improved. Further, as shown in fig. 8, a plurality of flow guiding spacing ribs 235 are disposed in both the top nozzle 2311 and the bottom nozzle 2312. It can be understood that the diversion spacer ribs 235 can support the top wall and the bottom wall of the outer wall plate 232, the structural strength of the outer wall plate 232 is strengthened, the deformation of the outer wall plate 232 is reduced as far as possible, in addition, the diversion spacer ribs 235 can also play a role in guiding the air flow, so that the air flow flows towards the negative pressure region 111, and hidden dangers such as smoke leakage caused by the inclination of the air flow in other directions are reduced as far as possible.

Further, as shown in FIG. 8, the spacing of the flow-directing spacer ribs 235 is 10-15 times the height dimension of the slots 234. The water conservancy diversion spacer rib 235 has suitable interval so as to improve the guide effect to the air current, and in addition, the water conservancy diversion spacer rib 235 of reasonable interval arrangement can also improve the structural strength of outer wall plate 232.

In some embodiments, as shown in fig. 1, the bottom of the main housing 1 is formed as a smoke collection hood 13, and an injection pipe 23 is provided at the bottom of the smoke collection hood 13 adjacent to the outer edge of the smoke collection hood 13.

Specifically, as shown in fig. 3 and 4, the horizontal projection of the injection pipe 23 is located in the horizontal projection of the smoke collecting cover 13, and the distance between the top wall of the injection pipe 23 and the bottom wall of the smoke collecting cover 13 is 30-50 mm. It can be understood that the smoke collection cover 13 can make the oil smoke enter the range hood 100 along the side wall of the smoke collection cover 13, which plays a role in guiding the oil smoke. The distance between the upper side wall of the injection pipe 23 and the bottom wall of the fume collecting hood 13 is 30-50mm, so that the airflow has a good injection effect, and a good fume suction effect is achieved. Specifically, when the distance between the upper side wall 2341 of the injection pipe 23 and the bottom wall of the smoke collecting cover 13 is 30-50mm, the injection pipe 23 has a large injection range for oil smoke, and can generate a powerful injection and entrainment effect, namely, when the oil smoke is large, more oil smoke escapes to the outer side of the range hood, and at the moment, under the guidance of the injection pipe 23 injecting air flow, the oil smoke can flow to the air inlet 11, so that the injection of the oil smoke far away from the smoke collecting cover 13 is realized. The distance between the upstream end A of the injection pipe 23 and the outer edge of the fume collecting hood 13 is 0-100 mm. Therefore, a limited space is formed between the bottom of the fume collecting hood 13 and the top wall of the injection pipe 23, and a good flow guiding effect is achieved. In the horizontal direction, the ejection pipe 23 and the fume collecting hood 13 have a proper distance so that the airflow has a good ejection effect, and a good fume suction effect is achieved.

In some embodiments, as shown in fig. 1, the air outlet 21 is located on the top wall of the main housing 1 and above the main fan of the range hood 100. It can be understood that the air quantity generated by the air outlet source 21 is smaller relative to the main fan, and the structure size can be designed to be smaller. Therefore, the air outlet source 21 is arranged above the air draft fan 14, the space above the air draft fan 14 can be fully utilized, the air outlet source 21 is arranged without occupying the space of the area where the main fan is located, and the excessive obstruction to the main air volume is avoided.

Specifically, the air outlet source 21 may be a centrifugal or diagonal fan, and thus has a large air volume and a small occupied space. The air outlet source 21 is not limited to the above centrifugal fan or diagonal flow fan, and the air outlet source 21 may be an axial flow fan or the like.

Specifically, the air outlet source 21 is installed on the top plate above the main blower, and the air outlet end of the air outlet source 21 may be disposed downward, and may also be disposed horizontally or obliquely.

In some embodiments, as shown in fig. 9, the air outlet duct 22 includes: an upper guide section 221, two downward extending sections 222, and two branch sections 223. The upper guiding section 221 is located above the main fan of the range hood 100 and connected to the air outlet 21, and the upper guiding section 221 is horizontally disposed. The downward extension section 222 is vertically disposed in the main housing 1, and both ends of the upper guide section 221 are connected to one of the downward extension sections 222, respectively. So that the flow is somewhat distributed before entering the downwardly extending section 222.

The two branch sections 223 are respectively connected to the bottoms of the downward extending sections 222, the two branch sections 223 extend in directions away from each other, and the two branch sections 223 are both connected to the injection pipe 23. The two branch sections 223 are arranged to separate the air flow before the air flow flows to the injection pipe 23, so that the air flow at each injection port 231 can be uniformly injected.

Specifically, as shown in fig. 9, the branching section 223 gradually increases in flow area in a direction away from the downward extending section 222. Therefore, the flow dividing effect of the branch section 223 on the air flow can be improved, the impact of the air flow on the inner wall of the branch section 223 is reduced, and the balanced distribution of the air flow is facilitated.

In some embodiments, as shown in fig. 9, the ejector pipes 23 are disposed on two opposite sides of the lower portion of the main housing 1, or the ejector pipes 23 are disposed on three adjacent sides of the lower portion of the main housing 1, or the ejector pipes 23 are annular and disposed on four lower sides of the main housing 1, and each of the branch sections 223 is connected to the ejector pipe 23 through at least one transition pipe 224. It can be understood that the transition pipe 224 serves to connect the branch section 223 and the injection pipe 23, and meanwhile, the transition pipe 224 is arranged to enable the airflow direction to be evenly transited from the vertical direction to the horizontal direction, so that the pipeline resistance is reduced, and the loss of the airflow is reduced.

To sum up, in the range hood 100 according to the embodiment of the present invention, the designed jet flow air outlet device 2 is used to re-collect the oil smoke diffused to the periphery in the negative pressure region 111 formed by the main blower, and the oil smoke is sucked into the main blower. Under the combined action of two fan air duct systems, compare traditional single fan system, can greatly reduce under the main fan amount of wind circumstances, still can realize fine oil absorption cigarette effect, have the good ability of resisting external environment and worsen. Therefore, the invention can realize good oil smoke absorption effect and greatly reduce the power consumption and noise (low air quantity and low rotating speed) of the main fan. The product can be improved in a breakthrough manner no matter from the perspective of energy conservation and environmental protection or the perspective of good user experience.

A range hood 100 in one embodiment of the present invention is described below with reference to fig. 1-9.

The extractor hood 100 according to the embodiment of the present invention includes: main casing 1 and air-out device 2.

The main housing 1 has an air inlet 11 and an air outlet 12, and the bottom of the main housing 1 is formed as a smoke collection hood 13.

The air outlet device 2 comprises an air outlet source 21, an air outlet conduit 22 and an injection pipe 23.

The air outlet 21 is located on the top wall of the main housing 1 and above the main fan of the range hood 100.

The air outlet duct 22 includes: an upper guide section 221, two downward extending sections 222, and two branch sections 223. The upper guiding section 221 is located above the main fan of the range hood 100 and connected to the air outlet 21, and the upper guiding section 221 is horizontally disposed. The downward extension section 222 is vertically disposed in the main housing 1, and both ends of the upper guide section 221 are connected to one of the downward extension sections 222, respectively. The two branch sections 223 are respectively connected to the bottoms of the downward extending sections 222, the two branch sections 223 extend in directions away from each other, and the two branch sections 223 are both connected to the injection pipe 23. The branching section 223 gradually increases in flow area in a direction away from the downwardly extending section 222. Each branch section 223 is connected to the ejector tube 23 by a plurality of transition tubes 224.

The injection pipes 23 are annular and are arranged on four sides below the main shell 1, the horizontal projection of the injection pipes 23 is positioned in the horizontal projection of the fume collecting hood 13, the distance between the upper side wall of the injection pipe 23 and the bottom wall of the fume collecting hood 13 is 30-50mm, and the distance between the upstream end A of the injection pipe 23 and the outer edge of the fume collecting hood 13 is 0-100 mm. The ejector pipe 23 includes an outer wall plate 232 and an inner wall plate 233 which are disposed opposite to each other, an outer surface of the outer wall plate 232 is a smooth curved surface, a middle portion of the outer wall plate 232 is curved in a direction away from the inner wall plate 233 to form an upstream end a, a middle portion of the inner wall plate 233 is curved in a direction away from the outer wall plate 232 to form a downstream end B, a portion of the inner wall plate 233 adjacent to the upstream end a extends between an upper end and a lower end of the outer wall plate 232, a top nozzle 2311 is defined between the upper end of the outer wall plate 232 and the inner wall plate 233, and a bottom nozzle 2312 is defined between the lower end of the outer wall plate 232 and the. The top nozzle 2311 and the bottom nozzle 2312 are both slits 234 extending in a direction around the intake port 11, and the outer surfaces of the inner wall plate 233 from the top nozzle 2311 and the bottom nozzle 2312 to the downstream end B are all coanda surfaces. A plurality of guide spacing ribs 235 are arranged in the top nozzle 2311 and the bottom nozzle 2312, and the distance between the guide spacing ribs 235 is 10-15 times of the height of the strip seam 234.

On the pipe cross-section of drawing penetrate pipe 23, regard the line of drawing penetrate pipe 23's upstream end A and downstream end B as the X axis, the X axis sets up along the horizontal plane, or the X axis tilt up sets up, and the angle that the X axis tilt up is no longer than horizontal plane 20 degrees. The outer wall panel 232 and the inner wall panel 233 are both symmetrically disposed with respect to the X-axis. The maximum distance of the wall plates in the X axis direction is L1, the maximum distance of the outer wall plate 232 in the direction perpendicular to the X axis direction is H1, and the ratio of H1 to L1 is 0.5-2. The outer wall panel 232 includes an outer wall outer surface and an outer wall inner surface toward the downstream end, at least a portion of the outer wall inner surface being gradually convex in a direction toward the X axis, and the outer wall inner surface forming a convex tip at the X axis that is convex toward the downstream end. . The distance between the upper and lower portions of the inner wall plate 233 nearest to the upstream end a is H21, the distance between the upper and lower portions of the inner wall plate 233 gradually increases in the direction toward the downstream end B, and the distance between the upper and lower portions of the inner wall plate 233 reaches a maximum at the ejection port 231, after which the upper and lower portions of the inner wall plate 233 smoothly extend toward the X-axis until the upper and lower portions of the inner wall plate 233 intersect the X-axis at the downstream end B, wherein the maximum dimension of the inner wall plate 233 in the direction perpendicular to the X-axis is H22, and H21 is 0.7 to 1 times that of H22.

Other configurations, such as circuit boards and motors, and operations of the range hood 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A range hood, comprising:

a main housing having an air inlet and an air outlet;

the air outlet device comprises an air outlet source, an air outlet guide pipe and an ejector pipe, the ejector pipe is positioned below the main shell, at least part of the top wall of the ejector pipe is spaced from the bottom wall of the main shell, and the air outlet source guides airflow to the ejector pipe through the air outlet guide pipe; wherein,

the injection pipe is provided with an upstream end and a downstream end in the smoke flowing direction, the injection pipe is provided with a jet orifice which jets air towards the downstream end to form an injection flow field, the jet orifice comprises a top jet orifice positioned on the top wall of the injection pipe and a bottom jet orifice positioned on the bottom wall of the injection pipe, at least part of the upper surface of the injection pipe positioned between the top jet orifice and the downstream end is a coanda surface, and at least part of the lower surface of the injection pipe positioned between the bottom jet orifice and the downstream end is a coanda surface;

draw the pipe including relative outer wall board and interior wallboard that sets up, the outer wall board with interior wallboard extends along draw the length direction of pipe, the mid portion orientation of outer wall board is kept away from the direction bending of interior wallboard is in order to form the upstream end, the mid portion orientation of interior wallboard is kept away from the direction bending of outer wall board is in order to form the downstream end, close to of interior wallboard the part of upstream end is stretched to between the upper end and the lower extreme of outer wall board, the upper end of outer wall board with inject between the interior wallboard the top spout, the lower extreme of outer wall board with inject between the interior wallboard the end spout.

2. The range hood of claim 1, wherein a connecting line of an upstream end and a downstream end of the ejector pipe is taken as an X axis on a pipe section of the ejector pipe, and the outer wall plate and the inner wall plate are symmetrically arranged relative to the X axis.

3. The range hood of claim 2, wherein the maximum distance of the outer wall plate in the X-axis direction is L1, the maximum distance of the outer wall plate in the direction perpendicular to the X-axis direction is H1, and the ratio of H1 to L1 is 0.5-2.

4. The range hood of claim 2, wherein the outer wall panel comprises an outer wall outer surface and an outer wall inner surface toward the downstream end, at least a portion of the outer wall inner surface being gradually convex in a direction toward the X axis, and the outer wall inner surface forming a convex tip at the X axis that is convex toward the downstream end.

5. The range hood of claim 2, wherein the distance between the upper and lower portions of the inner wall panel nearest the upstream end is H21, the distance between the upper and lower portions of the inner wall panel increases gradually in a direction toward the downstream end, and the distance between the upper and lower portions of the inner wall panel reaches a maximum at the injection port, after which the upper and lower portions of the inner wall panel smoothly extend toward the X axis until the upper and lower portions of the inner wall panel intersect the X axis at the downstream end, wherein the maximum dimension of the inner wall panel in a direction perpendicular to the X axis is H22, and H21 is 0.7 to 1 times H22.

6. The range hood of claim 2 wherein the outer surface of the inner wall panel from the jet opening to the downstream end is a coanda surface.

7. The range hood of claim 1, wherein the outer surface of the outer wall panel is a smooth curved surface.

8. The range hood of claim 2, wherein the X axis is disposed along a horizontal plane, or the X axis is disposed in an upward-inclined manner, and an upward-inclined angle of the X axis does not exceed 20 degrees of the horizontal plane.

9. The range hood of claim 1, wherein the top and bottom spouts are both slits extending in a horizontal direction.

10. The range hood of claim 9, wherein a plurality of flow guide spacing ribs are arranged in the top nozzle and the bottom nozzle, and the distance between the flow guide spacing ribs is 10-15 times of the height dimension of the strip seam.

11. The range hood according to claim 1, wherein the bottom of the main housing is formed into a smoke collecting hood, the ejector pipe is arranged at the bottom of the smoke collecting hood and close to the outer edge of the smoke collecting hood, the horizontal projection of the ejector pipe is located in the horizontal projection of the smoke collecting hood, the distance between the top wall of the ejector pipe and the bottom wall of the smoke collecting hood is 30-50mm, and the distance between the upstream end of the ejector pipe and the outer edge of the smoke collecting hood is 0-100 mm.

12. The range hood of claim 1, wherein the air outlet source is located on the top wall of the main housing and above a main fan of the range hood, and the air outlet duct comprises:

the upper guide section is positioned above a main fan of the range hood and is connected with the air outlet source, and the upper guide section is horizontally arranged;

the two downward extending sections are vertically arranged in the main shell, and two ends of the upper guide section are respectively connected with one downward extending section;

the two branch sections are respectively connected with the bottoms of the downward extending sections, extend towards directions far away from each other, and are connected with the injection pipe.

13. The range hood of claim 12, wherein the diverging section has a gradually increasing flow area in a direction away from the downwardly extending section.

14. The range hood according to claim 12, wherein the ejector pipes are disposed on opposite sides of the lower portion of the main housing, or the ejector pipes are disposed on three adjacent sides of the lower portion of the main housing, or the ejector pipes are annular and disposed on four lower sides of the main housing, and each of the branch sections is connected to the ejector pipe through at least one transition pipe.