CN110345540A

CN110345540A - Range hood

Info

Publication number: CN110345540A
Application number: CN201910780120.0A
Authority: CN
Inventors: 谢川川; 蓝渊; 张辉; 邓雁青; 马世涛; 汪耀东
Original assignee: Midea Group 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: 2019-10-18
Anticipated expiration: 2039-08-22
Also published as: JP2022534237A; KR20220016224A; CN110345540B; KR102576015B1; WO2021031449A1; JP7383054B2

Abstract

The invention discloses a kind of range hoods, comprising: main casing, main casing have air inlet and air outlet；Exhaust apparatus, exhaust apparatus include wind regime, outlet air conduit and ejector pipe, and ejector pipe is located at below main casing and is spaced apart with the bottom wall of main casing, and ejector pipe is equipped with jet port to form Ejection flow field, and air-flow is oriented to ejector pipe by outlet air conduit by wind regime out；Wherein, ejector pipe has upstream end and downstream on flow of flue gas direction, ejector pipe includes upper side wall and lower wall, upper side wall is connected with lower wall in upstream end, upper side wall and lower wall form jet port between downstream, upper side wall and lower wall are formed as arcwall, and at least partly outer surface of arcwall is coanda face.The smoke absorption effect of kitchen ventilator can be improved in range hood according to an embodiment of the present invention.

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 injection pipe, the injection pipe is positioned below the main shell and is spaced from the bottom wall of the main shell, the injection pipe is provided with a jet orifice to form an injection flow field, 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 flue gas flowing direction, the injection pipe comprises an upper side wall and a lower side wall, the upper side wall is connected with the lower side wall at the upstream end, the injection port is formed between the upper side wall and the lower side wall at the downstream end, the upper side wall and the lower side wall are formed into arc-shaped walls, and at least part of outer surfaces of the arc-shaped walls are coanda surfaces.

According to the range hood provided by the embodiment of the invention, the air outlet device is arranged and comprises the ejection pipe, the ejection pipe is provided with the ejection port for ejecting airflow, the upper side wall and the lower side wall of the ejection pipe are formed into the arc-shaped walls, at least part of the outer surface of the arc-shaped wall is the coanda surface, the cooperation of the ejection effect and the coanda effect is formed, the smoke at the upstream of the ejection pipe can be strongly attracted to the air inlet, so that 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 has insufficient suction force on the escaping smoke at the outer side of the main shell is overcome. 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 upper sidewall and the lower sidewall are first moved away from each other and then moved closer to each other in the flue gas flow direction, and the outer surfaces of the upper sidewall and the lower sidewall are coanda surfaces.

In some embodiments, the ejection direction of the ejection port is in a range from a horizontal plane to an angle of 20 degrees upward with respect to the horizontal plane.

In some embodiments, the cross section of the ejector pipe is in an airfoil shape, the upstream end of the ejector pipe is located at the leading edge of the airfoil shape, and the downstream end of the ejector pipe is located at the trailing edge of the airfoil shape.

Specifically, on the tube cross section of the ejector tube, a connecting line of an upstream end and a downstream end of the ejector tube is used as a first connecting line, a connecting line of a point which is farthest away from the upper side wall and the lower side wall in a direction perpendicular to the first connecting line is used as a second connecting line, the distance between the upstream end of the ejector tube and the second connecting line is L1, the distance between the downstream end of the ejector tube and the second connecting line is L2, the farthest distance between the upper side wall and the first connecting line is H1, the farthest distance between the lower side wall and the first connecting line is H2, the H1 and the H2 are equal, the ratio of L1 to H1 is 0.8-1.5, and the ratio of L2 to H1 is 2-4.

In some embodiments, the ejection port is a plurality of orifices or slits. .

Specifically, the height dimension of the jet holes or the strip slits is between 1mm and 5 mm.

In some embodiments, the injection port includes a plurality of the injection holes, and a pitch between adjacent injection holes is 2.5 to 4 times a height dimension of the injection holes.

In some embodiments, the jet opening is the strip seam, a flow guide spacing rib is arranged in the strip seam, and the distance between the flow guide spacing ribs is 3-10 times of the height size of the strip seam.

In some embodiments, the injection port comprises a plurality of injection holes, the injection holes are elliptical, the ratio of the major axis to the minor axis of the elliptical shape is 2-4, and the distance between the centers of the adjacent elliptical shapes is 3-5 times the major axis.

In some embodiments, the bottom of the main housing is formed as a fume collecting hood, and the ejector tube is provided at the bottom of the fume collecting hood adjacent to an outer edge of the fume collecting hood.

In some embodiments, the horizontal projection of the ejector pipe is located in the horizontal projection of the fume collecting hood, the distance between the upper side wall of the ejector pipe and the bottom wall of the fume collecting hood is 30-50mm, and the distance between the upstream end of the ejector pipe and the outer edge of the fume collecting hood is 0-100 mm.

In some embodiments, the air outlet source is located above an extraction fan within the main housing.

Specifically, the air outlet duct includes: a downwardly extending section vertically disposed within the main housing; a branch section disposed at a bottom of the main housing, the bottom of the downward extension section connecting a plurality of the branch sections; the elbow is located below the main shell, the upper end of the elbow extends into the main shell and is connected with the end part of the branch section, and the lower end of the elbow is connected with the end part of the injection pipe.

Further, the air outlet duct further comprises: and the upper guide section is positioned above the air exhaust fan and connected with the air outlet source, and the two ends of the upper guide section are horizontally arranged and are respectively connected with the downward extension section.

In some optional embodiments, a flow guiding structure is provided in the outlet duct, the flow guiding structure is provided at a connection between the downward extending section and the branch section, and the flow guiding structure is provided at a connection between the branch section and the elbow.

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 perspective view of an air outlet device according to an embodiment of the present invention;

fig. 3 is a partially enlarged view of the air outlet device and the smoke collecting hood shown in fig. 2;

FIG. 4 is a schematic view of an eductor tube and a portion of an elbow in accordance with an embodiment of the present invention;

FIG. 5 is a schematic illustration of the direction of flow of smoke in use of the cigarette maker under the smoke collection hood in one embodiment;

FIG. 6 is a schematic view of the smoke flow direction of the arrangement shown in FIG. 4 when the cigarette maker is in use;

FIG. 7 is a partial schematic view of an injector tube according to an embodiment of the invention (where the orifice is circular);

FIG. 8 is a partial schematic view of an ejector tube according to another embodiment of the present invention (where the orifices are two rows of circular holes);

FIG. 9 is a partial schematic view of an injector tube according to an embodiment of the invention (where the orifice is oval);

FIG. 10 is a schematic view of a portion of an injector tube according to yet another embodiment of the invention (where the orifice is rectangular);

FIG. 11 is a partial schematic view of an injector tube according to yet another embodiment of the invention (in which the orifices are race-track type);

fig. 12 is a perspective view of an air outlet device according to another embodiment of the present invention;

fig. 13 is a front view of the range hood where the air outlet device shown in fig. 12 is located;

fig. 14 is a schematic view of a partial wind direction flow of the wind outlet device shown in fig. 12;

fig. 15 is a partial schematic view of an air outlet duct in an embodiment (in which the air outlet duct is provided with a flow guiding structure at a wind direction corner).

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, a condensation plate 15, a fan box 16,

The air outlet device 2, the air outlet source 21, the air outlet duct 22, the upper guide section 221, the downward extending section 222, the branch section 223, the elbow 224, the flow guide structure 225, the injection pipe 23, the injection port 231, the injection hole 2311, the strip seam 2312, the flow guide spacing rib 2313, the upstream end a, the downstream end B, the arc-shaped wall 234, the upper side wall 2341 and the lower side wall 2342.

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", "rear", "left", "right", "top", "bottom", "inner", "outer", "center", "width", "horizontal", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. 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 15.

As shown in fig. 1 to 3, 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, and the air inlet 11 is located at the bottom of the main housing 1 to form a negative pressure region 111 below the main housing 1.

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 located below the main shell 1 and is spaced from the bottom wall of the main shell 1, an injection port 231 is arranged on the injection pipe 23 to form an injection flow field, and the air outlet source 21 guides air flow to the injection pipe 23 through the air outlet guide pipe 22. The ejector pipe 23 has an upstream end a and a downstream end B in the flue gas flowing direction, the ejector pipe 23 includes an upper side wall 2341 and a lower side wall 2342, the upper side wall 2341 and the lower side wall 2342 are connected at the upstream end a, the upper side wall 2341 and the lower side wall 2342 form the injection port 231 between the downstream ends B, the upper side wall 2341 and the lower side wall 2342 are formed into an arc-shaped wall 234, and at least part of the outer surface of the arc-shaped wall 234 is a 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 components such as a cold wall (such as a condensation plate 15) and a filter screen in the flowing process, oil drops in the airflow are easy to separate out and are separated.

The negative pressure region 111 has a large negative pressure, and can attract the oil smoke generated by the kitchen range and the cooker to converge towards the air inlet 11 and enter the range hood 100. Of course, the distribution of the negative pressure field formed below the main housing 1 is influenced by the operating state of the main blower and the structure of the range hood 100, and the negative pressure is usually the greatest at the region directly opposite to the air inlet under the main housing 1, but when the main housing 1 is provided with the condensation plate 15 at the air inlet 11, the condensation plate 15 moves the region with the strongest negative pressure outwards, and the profile of the region with the strongest negative pressure becomes larger, so in different embodiments, the direction of the injection port 231 can be adjusted according to the distribution of the negative pressure field in the embodiment.

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 (such as 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. When the amount of smoke is large, the negative pressure region 111 cannot completely suck the smoke to the air inlet 11, and part of the smoke diffuses 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 arranged to include an upper side wall 2341 and a lower side wall 2342, the upper side wall 2341 is connected with the lower side wall 2342 at the upstream end a, the injection port 231 is formed between the upper side wall 2341 and the lower side wall 2342 at the downstream end B, both the upper side wall 2341 and the lower side wall 2342 are arc-shaped walls 234, and at least part of outer surfaces of the arc-shaped walls 234 are coanda surfaces, so that airflow outside the injection pipe 23 can flow and collect more toward the negative pressure region 111, and especially, airflow which is about to diffuse to the outside of the range hood 100 can be greatly sucked to the negative pressure region 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. 5 and 6, if the upper surface of the upper side wall 2341 is a coanda surface, the airflow above the upper side wall 2341 can flow closely to the upper surface of the upper side wall 2341 when flowing toward the negative pressure region 111, and the airflow above the upper side wall 2341 can rapidly join with the airflow ejected from the ejection port 231, or flow toward the negative pressure region 111 by the ejection flow field generated by the airflow ejected from the ejection port 231. The airflow over the upper side wall 2341 can flow in a uniform direction toward the negative pressure region 111, so that a negative pressure is formed in the region over the upper side wall 2341. In the embodiment of the invention, since the injection pipe 23 is located below the main casing 1 and spaced from the bottom wall of the main casing 1, the outside of the main casing 1 communicates with the area above the upper side wall 2341, so that the area above the upper side wall 2341 forming negative pressure can suck smoke from the outside of the main casing 1. The coanda surfaces are arranged so that the flue gas to be escaped outside the main shell 1 flows transversely along the coanda surfaces to enter the negative pressure area 111 below the air inlet 11 and then is sucked into the main shell 1 under the action of negative pressure.

As also shown in fig. 5 and 6, if the lower surface of the lower side wall 2342 is a coanda surface, the airflow below the lower side wall 2342 can be caused to flow against the lower surface of the lower side wall 2342 when flowing toward the negative pressure region 111, so that the area below the lower side wall 2342 is subjected to negative pressure, and the area below the lower side wall 2342 subjected to negative pressure can suck flue gas from the outside of the main casing 1. The coanda surfaces are arranged so that the flue gas to be escaped outside the main shell 1 flows transversely along the coanda surfaces to enter the negative pressure area 111 below the air inlet 11 and then is sucked into the main shell 1 under the negative pressure action of the negative pressure area 111.

It can be understood that the air outlet device 2 is arranged by the injection pipe 23, on one hand, the injection flow field is used for driving the air flow above and below the injection flow field to flow towards the negative pressure region 11, on the other hand, the injection flow field is used for enabling the air flow on the upper surface of the upper side wall 2341 to form a trend of flowing towards the negative pressure region 11, and the air flow below the lower surface of the lower side wall 2342 forms a trend of flowing towards the negative pressure region 11. By arranging at least part of the outer surfaces of the upper side wall 2341 and the lower side wall 2342 as coanda surfaces, airflow flowing on the coanda surfaces flows to the injection port 231 along the coanda surfaces tightly, and another negative pressure is formed to attract the flue gas to be escaped outside the main casing 1 to 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 as to better suck the flue gas outside the injection pipe 23 to flow to the air inlet 11. The suction effect makes up for the defect that the negative pressure area 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 jet orifice 231 for jetting airflow towards the negative pressure region 111, the upper side wall 2341 and the lower side wall 2342 of the ejector pipe 23 are formed into the arc-shaped wall 234, at least part of the outer surface of the arc-shaped wall 234 is a coanda surface, the cooperation of the 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, so that the smoke about to escape at the outer side of the main shell 1 flows to the air inlet 11, and the defect of insufficient suction force of the existing range hood on the outer side of the main shell is. Therefore, the phenomenon that the range hood 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. 1, the main housing 1 includes: the exhaust hood comprises a fan box 16 and an exhaust hood 13, wherein the exhaust hood 13 is arranged at the bottom of the fan box 16, the bottom wall of the exhaust hood 13 is in an upwards sunken curved surface shape, and an air inlet 11 is formed in the sunken center of the bottom wall of the exhaust hood 13. After the main fan is started, a negative pressure area 111 is formed below the smoke collection cavity, and nearby oil smoke is sucked into the fan box 16 along the molded line of the smoke collection cavity and then discharged into the common flue. The smoke collecting cover 13 can enlarge the negative pressure area and improve the smoke collecting effect.

Optionally, the bottom of the fume collecting hood 13 is provided with a condensing plate 15, and the condensing plate 15 can improve the separation effect of oil drops. Furthermore, the condensing plate 15 is arranged corresponding to the air inlet 11, an annular air suction opening is formed around the condensing plate 15 and the smoke collection cavity, and the oil smoke enters the fan box 16 from the annular air suction opening. Through the effect of condensing panel 15, move negative pressure zone 11 to the edge of smoke collecting cavity to enlarge negative pressure zone 11's scope, thereby reduce the marginal cigarette that runs, promote the oil absorption cigarette effect.

Specifically, the exhaust fan 14 is provided in the fan box 16, and optionally, the exhaust fan 14 is a centrifugal fan, and the exhaust fan 14 provides a large amount of air and a large amount of air pressure, and functions to overcome the pressure of an external flue and form a negative pressure region inside, and sucks indoor air into the exhaust fan 14 and discharges the air to the outside (a common flue).

In some embodiments, as shown in fig. 4-6, the upper and lower sidewalls 2341 and 2342 are formed as arcuate walls 234 that first move away from each other and then move closer to each other in the flue gas flow direction. Therefore, the injection pipe 23 is easy to process and manufacture, and the injection pipe 23 is internally provided with a large enough pipe cavity so that the internal airflow is more uniform and stable. In fig. 5 and 6, arrows indicate the flow direction of the soot.

Specifically, the exterior surfaces of the upper side wall 2341 and the lower side wall 2342 are coanda surfaces. It can be understood that when oil smoke escapes from the periphery of the negative pressure region 111 to the outside, part of the oil smoke contacts the lower side wall 2342 of the ejector pipe 23, and the part of the oil smoke easily flows to the negative pressure region 111 along the lower side wall 2342 under the dual effects of the jet flow effect and the coanda effect; when part of the oil smoke bypasses the lower side wall 2342 and spreads upwards, the oil smoke is easily sucked by the negative pressure field formed by the upper side wall 2341, and the part of the oil smoke can flow to the negative pressure region 111 along the upper side wall 2341. 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 embodiments, as shown in fig. 1 and 2, the ejection direction of the ejection ports 231 is within an angle range of 20 degrees from a horizontal plane to an upper side with respect to 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, so that the smoke suction range can be expanded on the premise of not reducing the negative pressure of the negative pressure area 11.

In some embodiments, as shown in fig. 4 and 5, the cross section of the injection pipe 23 is an airfoil shape, the upstream end a of the injection pipe 23 is located at the leading edge of the airfoil shape, and the downstream end B of the injection pipe 23 is located at the trailing edge of the airfoil shape. The upstream end A is an airfoil leading edge and is an obtuse angle, and the downstream end B is an airfoil trailing edge and is an acute angle.

Thus, when the oil smoke escapes to the outer side of the injection pipe 23, the smoke suction force generated by the double effects of the injection effect and the coanda effect draws the air flow to flow towards the negative pressure area 111. In the flowing process, the ejecting pipe 23 with the pipe section in the wing-shaped shape can reduce the resistance to the oil smoke flowing, so that the oil smoke can flow from the upstream end a to the downstream end B quickly, the oil smoke can flow to the negative pressure area 111 quickly, and the smoke suction efficiency of the range hood 100 can be improved. It should be noted that the airfoil shape refers to a cross-sectional shape of an aircraft wing, and the pipe cross-section of the injection pipe 23 may adopt an airfoil shape known in the prior art, and the airfoil shape is not particularly limited herein.

Specifically, the airfoil shape of the injection pipe 23 is an airfoil shape that is symmetrical in the upper and lower sides, with the injection direction of the injection port 231 as a reference surface.

Specifically, as shown in fig. 4, in the pipe cross section of the ejector pipe 23, a line connecting the upstream end a and the downstream end B of the ejector pipe 23 serves as a first line, and a line connecting a point farthest away from the upper side wall 2341 and the lower side wall 2342 in a direction perpendicular to the first line serves as a second line. The distance between the upstream end A of the injection pipe 23 and the second connecting line is L1, the distance between the downstream end B of the injection pipe 23 and the second connecting line is L2, the farthest distance between the upper side wall 2341 and the first connecting line is H1, the farthest distance between the lower side wall 2342 and the first connecting line is H2, H1 is equal to H2, the ratio of L1 to H1 is 0.8-1.5, and the ratio of L2 to H1 is 2-4.

Specifically, as shown in fig. 4, the first connection line is an AB line segment, the second connection line is a CD line segment, and an intersection point of the AB line segment and the CD line segment is O. The length of the AO segment is L1, the length of the BO segment is L2, the length of the CO segment is H1, and the length of the DO segment is H2. Wherein H1-H2 is defined as a-L1/H1, b-L2/H1, a is more than or equal to 0.8 and less than or equal to 1.5, and b is more than or equal to 2 and less than or equal to 4. So the restriction, draw and penetrate pipe 23 and form the wing section wind channel structure of longitudinal symmetry, can reach better drawing and penetrate the effect.

In the embodiment of the present invention, the injection pipe 23 may be one pipe or a plurality of pipes. The injection pipe 23 is arranged along the bottom edge of the main casing 1, and the specific extension shape of the injection pipe 23 is not limited and can be matched according to actual needs. For example, when the bottom of the main housing 1 is square, the injection pipe 23 is linear, L-shaped or square; when the bottom of the main shell 1 is circular or elliptical, the injection pipe 23 is arc-shaped, circular or elliptical. In the height direction, the injection pipe 23 may be provided with one layer or a plurality of layers.

Similarly, the injection port 231 of the injection pipe 23 may be disposed in various manners.

In some embodiments, as shown in fig. 3 and 7, the injection port 231 is a plurality of injection holes 2311 or slits 2312. Thus, the air flow can be sprayed outwards through the plurality of spray holes 2311 or the slits 2312, and the plurality of spray holes 2311 or the slits 2312 are beneficial to guiding the flow of the air flow and enabling the air flow to be more uniform.

When the ejection port 231 is a plurality of the injection holes 2311, the hole shape of the injection holes 2311 is not limited here, and may be, for example, a circular hole as shown in fig. 7, an elliptical hole as shown in fig. 9.

In some examples, the ejector pipe 23 is an annular pipe extending around the axial direction of the air inlet 11, in other examples, the ejector pipe 23 is a straight pipe or a bent pipe or the like disposed on one side of the main housing 1, in other examples, the ejector pipe 23 extends on two adjacent sides or three adjacent sides of the main housing 1, the injection port 231 may be a plurality of injection holes 2311 arranged along the extending direction of the ejector pipe 23, and the injection port 231 may also be a strip seam 2312 disposed along the extending direction of the ejector pipe 23.

As shown in fig. 7 and 8, the nozzle holes 2311 may be arranged in a single row or in two rows.

Specifically, when the injection port 231 is a plurality of injection holes 2311, the injection holes 2311 may or may not be arranged equidistantly.

Alternatively, as shown in fig. 7-11, the height dimension of the orifice 2311 or slot 2312 is between 1mm and 5 mm. When the nozzle hole 2311 is a circular hole as shown in fig. 7 and 8, the definition of the height dimension described above means that the diameter d of the circular hole has a dimension between 1mm and 5 mm. When the injection hole 2311 is an elliptical hole as shown in fig. 9, the major axis of the elliptical hole is horizontally disposed, and the definition of the above-mentioned height dimension means that the minor axis dimension of the elliptical hole is between 1mm and 5 mm. Thus, the nozzle 2311 or the slit 2312 has a proper height to inject the air flow, so that a good injection effect is achieved.

It should be noted that, when the size of the nozzle 2311 or the slit 2312 is between 1mm and 5mm, the nozzle 2311 or the slit 2312 enables the airflow to be uniformly ejected, which is beneficial to the generation of powerful jet entrainment effect of the airflow and can improve the rigidity of the injection pipe 23.

In some embodiments, the injection port 231 includes a plurality of injection holes 2311, and a pitch between adjacent injection holes 2311 is 2.5 to 4 times a height dimension of the injection holes 2311. Taking fig. 7 as an example, the optimal range of the hole distance Ld between adjacent circular holes is 2.5 × d ≦ Ld ≦ 4 × d. Thus, the plurality of injection holes 2311 are spaced at an appropriate interval to reduce the influence on the structural strength of the upper side wall 2341 and the lower side wall 2342, and to reduce the deformation of the upper side wall 2341 and the lower side wall 2342 as much as possible. Meanwhile, the plurality of spray holes 2311 with reasonable intervals can improve the guiding effect of the injection pipe 23 on the airflow so as to generate good injection effect.

In some embodiments, as shown in fig. 10 and 11, the injection port 231 is a slit 2312, and the slit 2312 is provided with flow guiding spacing ribs 2313, and the spacing of the flow guiding spacing ribs 2313 is 3-10 times of the height dimension of the slit 2312. It can be understood that the guide spacing rib 2313 can support the upper side wall 2341 and the lower side wall 2342, reinforce the structural strength of the upper side wall 2341 and the lower side wall 2342, reduce deformation of the upper side wall 2341 and the lower side wall 2342 as much as possible, and guide the flow direction of the airflow by the guide spacing rib 2313, so that the airflow moves towards the negative pressure region 111, and hidden dangers such as smoke leakage caused by the airflow inclining to flow to other directions are reduced as much as possible.

Specifically, as shown in fig. 10, the slit 2312 is a long strip shape and is divided into a plurality of rectangular small holes at intervals of the plurality of guide spacers 2313. When the width of the slit 2312 is large, chamfers can be formed at the upper end and the lower end of the diversion spacing rib 2313. The good injection effect of the air outlet device 2 can be realized, and the shape of the strip seam 2312 is not particularly limited.

In some embodiments, as shown in fig. 9, the ejection port 231 includes a plurality of ejection holes 2311, the ejection holes 2311 are elliptical, a ratio between a major axis and a minor axis of the elliptical is 2 to 4, and a distance between centers of adjacent elliptical is 3 to 5 times the major axis. Thus, the holes 2311 have a suitable curvature to facilitate the flow of the air flow, and the adjacent ellipses have a suitable spacing to make the air flow more uniform while ensuring the structural strength of the ejector tube 23.

In some embodiments, as shown in fig. 1 and 2, the bottom of the main housing 1 is formed as a smoke collection hood 13, and an ejector pipe 23 is provided at the bottom of the smoke collection hood 13 adjacent to the outer edge of the smoke collection hood 12.

Specifically, the distance between the upper side wall 2341 of the injection pipe 23 and the bottom wall of the smoke collecting cover 13 is 30-50 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 2341 of the injection pipe 23 and the bottom wall of the smoke collecting cover 13 is 30-50mm, so that airflow has a good injection effect, and a good oil smoke absorption effect is achieved. Particularly, when drawing the interval between the diapire 2341 of leading to penetrate pipe 23 and collection petticoat pipe 13 and be 30-50mm, draw and penetrate pipe 23 and to draw the range of penetrating of oil smoke big, and can produce the powerful entrainment effect of penetrating, promptly when the oil smoke is great, have more oil smoke to escape the outside of lampblack absorber, draw under the guide of pipe 23 jet air current of penetrating this moment, the oil smoke can flow to the air intake to realize drawing of the oil smoke far away apart from collection petticoat pipe 13.

In some embodiments, as shown in fig. 1 and 2, the horizontal projection of the ejector pipe 23 is located within the horizontal projection of the fume collecting hood 13, and the distance between the upstream end a of the ejector pipe 23 and the outer edge of the fume collecting hood 13 is 0 to 100 mm. Therefore, a limited space is formed between the bottom of the smoke collecting cover 13 and the upper side wall 2341 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 and 3, the air outlet source 21 is located above the air extraction fan 14 within the main housing 1. 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.

More specifically, as shown in fig. 2 and 12, the air outlet duct 22 includes: a downwardly extending section 222, a plurality of branch sections 223, and an elbow 224. The downward extension section 222 is vertically disposed in the main casing 1, the branch section 223 is disposed at the bottom of the main casing 1, and the bottom of the downward extension section 222 connects the plurality of branch sections 223. The elbow 224 is located below the main casing 1, the upper end of the elbow 224 extends into the main casing 1 and is connected to the end of the branch section 223, and the lower end of the elbow 224 is connected to the end of the ejector pipe 23. The arrangement of the plurality of branch sections 223 enables the airflow to be divided before flowing to the injection pipe 23, and is beneficial to the balanced injection of the airflow at each injection port 231.

In some embodiments, as shown in fig. 2, the outlet duct 22 includes: and an upper guide section 221, wherein the upper guide section 221 is located above the exhaust fan 14 and connected to the air outlet source 21, the upper guide section 221 is horizontally disposed, and two ends of the upper guide section 221 are respectively connected to a downward extension section 222, so that the air flow is distributed before entering the downward extension section 222.

In a specific embodiment, as shown in fig. 2, the upper guiding section 221 is horizontally disposed, two ends of the upper guiding section 221 are respectively connected with one downward extending section 222, the two downward extending sections 222 are respectively located on left and right side walls inside the fan box 16, the bottom of each downward extending section 222 is respectively connected with two branch sections 223, and all the branch sections 223 are located inside the smoke collecting hood 13. It will be appreciated that the fume collecting hood 13 has top and bottom walls, with the branch section 223 being located between the top and bottom walls of the fume collecting hood 13. Thus, the bottom of each downwardly extending section 222 in the sandwich forms a chevron tee structure, split into two, extending to the front and rear sides, respectively. Thus, the air outlet duct is respectively provided with two pipelines at the left side and the right side of the range hood. In fig. 2, the two branch sections 223 on the left side are each connected to an elbow 224, and the lower ends of the two elbows 224 are bent toward each other and connected to one ejector pipe 23. Each bent pipe 224 is a circular arc bent pipe, and the bent pipes 224 are arranged to enable the airflow direction to smoothly transit from the vertical direction to the horizontal direction, so that the pipeline resistance is reduced, and the loss of the airflow is reduced.

In another embodiment, as shown in fig. 12 and 13, the outlet duct 22 does not have the upper guiding section 221, the outlet source 21 is directly connected to the downward extending section 222, the bottom of the downward extending section 222 is connected to a plurality of branch sections 223, the free end of each branch section 223 is connected to one bent pipe 224, and the bent pipe 224 is connected to the ejector pipe 23. Wherein the downwardly extending section 222 is located on the rear wall inside the fan case 16, and the plurality of branch sections 223 are located between the top wall and the bottom wall of the smoke collecting hood 13. In fig. 12, only one end of each injection pipe 23 is connected with a bent pipe 224, and the bent pipe 224 is a circular arc bent pipe.

As can be seen from the two embodiments shown in fig. 2 and 12, in the process of guiding the airflow from the air outlet source 21 to the ejector pipe 23, the air outlet duct 22 may be provided with various branch ways, so that the airflow can be uniformly distributed in the ejector pipe 23.

Further, the tubular cavity of the air outlet duct 22 has a flat cross-section structure, so that the influence on the air inlet of the main blower can be reduced, and the cross-section can be rectangular, circular, oval and the like. The cross-sectional area may be variable or constant during the extension of the air duct. After entering the interlayer space between the top wall and the bottom wall of the exhaust fume collecting hood 12, the air outlet duct 22 can be divided into one or more branch ducts connected with the lower injection duct 23. Each ejector pipe 23 can be communicated with the air outlet guide pipe 22 at multiple positions, and multiple air inlets can reduce the fluid resistance of the air outlet guide pipe 22 and the ejector pipes 23 and increase the speed uniformity of the airflow of the ejector pipes 23.

In some alternative embodiments, as shown in fig. 14 and 15, a flow guiding structure 225 is disposed in the air outlet duct 22. As shown for example in fig. 14, a flow guiding structure 225 may be provided at the junction of the downwardly extending section 222 and the branch section 223, and as shown for example in fig. 15, a flow guiding structure 225 may be provided at the junction of the branch section 223 and the elbow 224. The arrangement of the flow guide structure 225 is beneficial to the flow of air flow, reduces the resistance in the air flow flowing process, and reduces the loss of the air flow, thereby improving the injection effect of the air outlet device 2.

To sum up, in the range hood 100 of the embodiment of the present invention, the designed jet air outlet device 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. 1-6.

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

The bottom of the main casing 1 is formed into a smoke collecting hood 13, the main casing 1 has an air inlet 11 and an air outlet 12, the air inlet 11 is located at the bottom of the main casing 1 to form a negative pressure area 111 below the air inlet 11, and the axis of the air inlet 11 is vertically arranged.

The air outlet device 2 comprises an air outlet source 21, an air outlet guide pipe 22 and an injection pipe 23, wherein the air outlet source 21 guides airflow to the injection pipe 23 through the air outlet guide pipe 22.

The injection pipe 23 is located below the main casing 1 and spaced apart from the bottom wall of the main casing 1, and the injection pipe 23 is provided with an injection port 231 on one side of the axis facing the air inlet 11. The injection pipe 23 is provided with an upstream end A and a downstream end B in the smoke flowing direction, the injection pipe 23 comprises an upper side wall 2341 and a lower side wall 2342, the upper side wall 2341 is connected with the lower side wall 2342 at the upstream end A, the upper side wall 2341 and the lower side wall 2342 form the injection port 231 at the downstream end B, the pipe section of the injection pipe 23 is in an airfoil shape, the upstream end A of the injection pipe 23 is located at the front edge of the airfoil shape, and the downstream end B of the injection pipe 23 is located at the tail edge of the airfoil shape. The upper side wall 2341 and the lower side wall 2342 are formed as the arc-shaped walls 234 which are symmetrically arranged, and both the upper surface of the upper side wall 2341 and the lower surface of the lower side wall 2342 are coanda surfaces.

On the pipe section of the injection pipe 23, a connection line of an upstream end a and a downstream end B of the injection pipe 23 is used as a first connection line, a connection line of a farthest point between the upper side wall 2341 and the lower side wall 2342 in a direction perpendicular to the first connection line is used as a second connection line, the distance between the upstream end a of the injection pipe 23 and the second connection line is L1, the distance between the downstream end B of the injection pipe 23 and the second connection line is L2, the farthest distance between the upper side wall 2341 and the first connection line is H1, the farthest distance between the lower side wall 2342 and the first connection line is H2, the H1 and H2 are equal, the ratio of L1 to H1 is 0.8 to 1.5, and the ratio of L2 to H1 is 2 to 4. The injection port 231 is a plurality of injection holes 2311 arranged along the extending direction of the injection pipe, and the injection holes 2311 are round holes. The diameter size of the spray holes 2311 is between 1mm and 5mm, and the pitch between the adjacent spray holes 2311 is 2.5 to 4 times of the diameter size of the spray holes 2311. The horizontal projection of the injection pipe 23 is positioned in the horizontal projection of the fume collecting hood 13, 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 air outlet duct 22 includes: an upper guide section 221, a downward extension section 222, a plurality of branch sections 223, and a plurality of elbows 224. The upper guide section 221 is located above the exhaust fan 14 and connected to the air outlet source 21. The downward extending sections 222 extend downward from both ends of the upper guide section 221, respectively, and the upper guide section 221 and the two downward extending sections 222 are located in the main casing 1. The bottom of each downward extension section 222 is connected with a plurality of branch sections 223, and each branch section is connected with the injection pipe 23 through an elbow 224.

Other configurations, such as circuit boards and motors, and operations of the extractor 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 injection pipe, the injection pipe is positioned below the main shell and is spaced from the bottom wall of the main shell, the injection pipe is provided with a jet orifice to form an injection flow field, and the air outlet source guides airflow to the injection 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 comprises an upper side wall and a lower side wall, the upper side wall is connected with the lower side wall at the upstream end, the injection port is formed between the upper side wall and the lower side wall at the downstream end, the upper side wall and the lower side wall are formed into arc-shaped walls, and at least part of outer surfaces of the arc-shaped walls are coanda surfaces.

2. The range hood of claim 1, wherein the upper sidewall and the lower sidewall move away from each other and then approach each other in a flue gas flow direction, and outer surfaces of the upper sidewall and the lower sidewall are coanda surfaces.

3. The range hood of claim 1, wherein the spray direction of the spray openings is within a range from a horizontal plane to an upward angle of 20 degrees relative to the horizontal plane.

4. The range hood of claim 1, wherein the cross section of the ejector pipe is airfoil-shaped, the upstream end of the ejector pipe is located at the leading edge of the airfoil shape, and the downstream end of the ejector pipe is located at the trailing edge of the airfoil shape.

5. The range hood according to claim 4, wherein on the pipe section of the ejector pipe, a connecting line of an upstream end and a downstream end of the ejector pipe is taken as a first connecting line, a connecting line of a point which is farthest away from the upper side wall and the lower side wall in the direction perpendicular to the first connecting line is taken as a second connecting line, the distance between the upstream end of the ejector pipe and the second connecting line is L1, the distance between the downstream end of the ejector pipe and the second connecting line is L2, the farthest distance between the upper side wall and the first connecting line is H1, the farthest distance between the lower side wall and the first connecting line is H2, H1 is equal to H2, the ratio of L1 to H1 is 0.8-1.5, and the ratio of L2 to H1 is 2-4.

6. The range hood of claim 1, wherein the jet opening is a plurality of jet holes or slits.

7. The range hood of claim 6, wherein the height dimension of the spray holes or the slits is between 1mm and 5 mm.

8. The range hood of claim 6, wherein the injection port comprises a plurality of injection holes, and a pitch between adjacent injection holes is 2.5 to 4 times a height dimension of the injection holes.

9. The range hood of claim 6, wherein the jet opening is the slot, a flow guide spacing rib is arranged in the slot, and the distance between the flow guide spacing ribs is 3-10 times of the height dimension of the slot.

10. The range hood of claim 6, wherein the injection port comprises a plurality of injection holes, the injection holes are oval, a ratio of a major axis to a minor axis of the oval is 2-4, and a distance between centers of adjacent oval is 3 to 5 times the major axis.

11. The range hood of any one of claims 1 to 10, wherein the bottom of the main housing is formed as a fume collecting hood, and the ejector pipe is provided at the bottom of the fume collecting hood adjacent to an outer edge of the fume collecting hood.

12. The range hood according to claim 11, wherein the horizontal projection of the ejector pipe is located in the horizontal projection of the fume collecting hood, the distance between the upper side wall of the ejector pipe and the bottom wall of the fume collecting hood is 30-50mm, and the distance between the upstream end of the ejector pipe and the outer edge of the fume collecting hood is 0-100 mm.

13. The range hood of any one of claims 1-10, wherein the air outlet source is located above an extractor fan within the main housing.

14. The range hood of claim 13, wherein the air outlet duct comprises:

a downwardly extending section vertically disposed within the main housing;

a branch section disposed at a bottom of the main housing, the bottom of the downward extension section connecting a plurality of the branch sections;

the elbow is located below the main shell, the upper end of the elbow extends into the main shell and is connected with the end part of the branch section, and the lower end of the elbow is connected with the end part of the injection pipe.

15. The range hood of claim 14, wherein the air outlet duct further comprises:

and the upper guide section is positioned above the air exhaust fan and connected with the air outlet source, and the two ends of the upper guide section are horizontally arranged and are respectively connected with the downward extension section.

16. The range hood of claim 14, wherein a flow guide structure is disposed in the outlet duct, the flow guide structure is disposed at a connection between the downward extending section and the branch section, and the flow guide structure is disposed at a connection between the branch section and the elbow.