Range hood

Abstract

The utility model discloses a range hood which comprises a smoke collecting box body, the smoke collecting box body comprises a transversely extending first part which comprises a smoke collecting hood and a top smoke inlet, and a smoke collecting cavity with an opening in the bottom surface is formed in the smoke collecting hood; the second part extends longitudinally and is located below the first part, the second part comprises a front panel, and a side smoke inlet is formed in the front panel; the smoke collecting cavity is at least partially located on the front side of the front panel and at least partially located on the rear side of the front panel, and the top smoke inlet is located on the rear side of the front panel and is not higher than the front panel. Compared with the prior art, the utility model has the advantages that the top smoke inlet is positioned on the rear side of the front panel and is not higher than the front panel, so that a user can hide the top smoke inlet in a front view angle in a hanging state, frequent cleaning of an exposed part is avoided, and the full-hidden oil smoke suction effect of the top smoke inlet is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oil fume purification device, especially an oil fume extractor. BACKGROUND

[0002] The oil fume extractor has become one of the indispensable kitchen household electrical appliances in modern families. At present, the oil fume extractor has various forms, including side suction type, top suction type and "7" type with top and side double suction. Among them, the oil fume extractor with top and side double suction has the side air inlet arranged below the top air inlet, which is closer to the cooking bench and plays a major role in smoke suction, and the top air inlet is used to suck away the part escaping from the side air inlet. Such configuration can achieve a high oil fume suction rate.

[0003] The existing oil fume extractor with top and side double suction, such as the side and top type oil fume extractor disclosed in the Chinese patent (publication number CN110207233A) with the application number 201910512624.4, comprises a cover body, a fan shell is installed on the top wall of the cover body, the front panel of the cover body is arranged obliquely, a top smoke collection cover with an open bottom is fixed to the upper part of the front panel, a top suction air inlet is opened on the front panel at the connection part of the top smoke collection cover, the top suction air inlet is in communication with the smoke collection cavity formed by the top smoke collection cover and the top suction air inlet, and a front suction air inlet opening adjusting device is installed at the front suction air inlet.

[0004] Such existing oil fume extractor, the top suction air inlet is at the connection part of the top smoke collection cover and the front panel, and the top suction air inlet is located on the front plane, so that there will be obvious oil accumulation around the exposed air inlet, increasing the risk of oil dripping outward. Even if it does not fall, it will also flow downward along the inclined front panel, increasing the cleaning difficulty and reducing the user experience. In addition, the recess cavity in the top smoke collection cover is in the shape of a general cuboid, which cannot effectively guide the oil fume, and the path of the oil fume upward entering the rear part changes suddenly, causing a large flow loss. SUMMARY

[0005] The utility model solves the technical problems of the prior art, provides an oil fume extractor, realizes the hiding of the top smoke inlet, avoids frequent cleaning, and improves the oil fume suction effect.

[0006] The utility model adopts the technical scheme for solving the above technical problems: an oil fume extractor, comprising a smoke collecting box body, the smoke collecting box body comprising:

[0007] a first part extending transversely, comprising a smoke collecting cover and a top smoke inlet, a smoke collecting cavity with an open bottom is formed in the smoke collecting cover; and

[0008] A second part extending longitudinally below the first part, the second part comprising a front panel, a side smoke inlet being formed on the front panel; characterized in that:

[0009] The smoke collecting cavity is at least partially located at the front side of the front panel and at least partially located at the rear side of the front panel, and the top smoke inlet is located at the rear side of the front panel and is not higher than the front panel.

[0010] By locating the top smoke inlet at the rear side of the front panel and not higher than the front panel, the user can achieve the hiding of the top smoke inlet in the on-hook state, avoiding the frequent cleaning of the exposed part, and achieving the full-hidden effect of the top smoke inlet. In addition, part of the smoke collecting cavity is located at the rear side of the front panel, so that at least part of the oil accumulated on the surface of the smoke collecting cavity can drip downward into the second part to avoid directly flowing down from the outer surface of the front panel of the second part.

[0011] Further, in the oil fume flow path, the top smoke inlet is located downstream of the entire smoke collecting cavity, which can provide sufficient buffer space for the oil fume, so that the oil fume can be buffered in the smoke collecting cavity to reduce turbulence, and then smoothly reach the top smoke inlet after flowing out from the rear side of the smoke collecting cavity.

[0012] Further, to reduce the sudden change of the oil fume path and guide the oil fume, the top smoke inlet comprises a first smoke inlet part, which is located at the rear side of the smoke collecting cavity and below the smoke collecting cavity.

[0013] Further, the top surface of the smoke collecting cover constituting the smoke collecting cavity comprises a first top plate and a second top plate, the first top plate gradually slopes downward from front to rear, and the second top plate gradually slopes downward from the rear end of the first top plate. Thus, the oil on the surface of the smoke collecting cavity can be guided rearward to ensure that the oil drips into the second part, and the oil fume is guided rearward and downward to cooperate with the first smoke inlet part below the rear side of the smoke collecting cavity to pass through the first smoke inlet part smoothly and reduce the sudden change of the oil fume path.

[0014] Preferably, the first part further comprises a first folded edge constituting the first smoke inlet part, the first folded edge being a perforated plate member, and the first folded edge extending downward from the rear end of the smoke collecting cover. By providing the first folded edge, the first smoke inlet part can be easily formed, and the oil on the upper surface of the smoke collecting cavity can be guided downward into the second part.

[0015] Further, to increase the smoke inlet area and ensure that the oil fume passes through the top smoke inlet quickly, the top smoke inlet further comprises a second smoke inlet part, which is located below the first smoke inlet part.

[0016] Preferably, the first part further comprises a second folded edge constituting the second smoke inlet portion, the second folded edge also being a perforated plate member, and the second folded edge extends forward from the lower end of the first folded edge to the front panel. By providing the second folded edge, the second smoke inlet portion can be formed, and the oil smoke that has not been guided to the first smoke inlet portion can be prevented from accumulating in the space formed by the first folded edge, the second folded edge, and the front panel to form a vortex, and the oil smoke can be guided out in time to avoid affecting the normal discharge of the oil smoke from the first smoke inlet portion and the noise that may be caused thereby; at the same time, the oil on the first folded edge can be guided downward to the front panel and then flow down along the front panel to prevent splashing in the smoke collection box.

[0017] Further, the front side end of the second folded edge extends downward to form a third folded edge, the third folded edge is tightly attached to the inner surface of the front panel of the second part and is fixed with the front panel. The third folded edge is tightly attached to the front panel of the second part, which can ensure more contact area after installation with the front panel, ensure subsequent welding with the left and right connecting structures and better support the front panel, and better support the front panel when the user cleans and presses.

[0018] Further, to improve the manufacturability of the top smoke inlet, the included angle between the first folded edge and the second folded edge is B, and B≥90° is satisfied to avoid forming a concave structure that cannot be bent and demolded during processing.

[0019] Further, the acute angle between the second folded edge and the horizontal plane is θ, and θ≥12° is satisfied, so as to facilitate the downward guidance of the oil liquid flowing down the first folded edge.

[0020] Further, the first folded edge has at least two first smoke inlet holes arranged at intervals in the left-right direction of the range hood, and the second folded edge has at least two second smoke inlet holes arranged at intervals in the left-right direction of the range hood. By providing the smoke inlet holes as described above, on the one hand, the air inlet area requirement is ensured to ensure the performance and oil smoke suction effect, and on the other hand, the interval arrangement of the smoke inlet holes relative to the overall long strip smoke inlet hole arrangement has better strength of the overall structure, improves the stability of the structure and the consistency of the part material state, thereby ensuring the reliability of the oil smoke suction effect.

[0021] Further, to reduce the risk of oil droplet falling and facilitate the reduction of processing blanking difficulty, the included angle between the first folded edge and the rear side end of the smoke collection cover is A, and 75°≤A≤110° is satisfied.

[0022] Preferably, the first part further comprises a second folded edge, the second folded edge extends forward from the lower end of the first folded edge to the front panel. By providing the second folded edge, the oil on the first folded edge can be guided downward to the front panel and then flow down along the front panel to prevent splashing in the smoke collection box.

[0023] Further, to increase the smoke inlet area and ensure that the oil fume quickly passes through the top smoke inlet, the top smoke inlet further comprises a second smoke inlet portion located below the first smoke inlet portion.

[0024] Further, the top surface of the smoke collection hood constituting the smoke collection cavity comprises a first top plate, a second top plate and a third top plate, the first top plate gradually inclines downward from front to back, the second top plate gradually inclines downward from the rear end of the first top plate to the back, and the third top plate gradually inclines downward from the front end of the first top plate to the front. The smoke collection cavity thus arranged has an overall height gradually increasing from front to back and then gradually decreasing, which can have better flow guiding effect and oil guiding effect, so that the oil liquid adsorbed on the surface of the smoke collection hood is gathered and collected along the first top plate and the second top plate to the back, and then flows downward along the second portion of the inner wall, thereby avoiding flowing down from the front surface of the front plate.

[0025] Further, the projection area of the first top plate on the horizontal plane is S1, the projection area of the second top plate on the horizontal plane is S2, and the projection area of the third top plate on the horizontal plane is S3, and S1>S3>S2. The projection area of the first top plate is the largest, which can ensure effective smoke collection in the area covered by the first top plate. The third top plate is located near the front side end of the first portion of the smoke collection box, and the projection area of the third top plate is larger because the smoke is guided from here. The inclined surface can make the oil fume path shorter, and the negative pressure of the inclined surface is distributed like a beam, which has a larger negative pressure difference, so that the oil fume near the front side can be guided from the space below the third top plate to the space below the first top plate, and the oil fume will not escape. The oil fume enters the top smoke inlet from the space below the second top plate, and the projection area of the second top plate is smaller, thereby minimizing the path before the top smoke inlet

[0026] Further, the angle between the third top plate and the bottom surface of the smoke collection cavity is α, and 20°≤α≤60°, and the angle between the second top plate and the bottom surface of the smoke collection cavity is β, and 30°≤β≤80°. The inclination of the second top plate and the third top plate is relatively gentle and extends a certain width, so that the oil fume in front of the smoke collection hood can enter the smoke collection cavity smoothly and be guided to the top smoke inlet at the back. Otherwise, if the inclination of the third top plate is relatively large, the oil fume deceleration effect is not obvious, and the oil fume entering the smoke collection cavity from the front of the smoke collection hood will quickly turn after hitting the first top plate, which will cause airflow turbulence and the oil fume will escape from the front. At the same time, the second top plate also has a certain inclination, so that the oil fume can smoothly transition from the smoke collection cavity to the top smoke inlet.

[0027] Further, the extractor hood further comprises an upper box body connected to the smoke collection box body and a fan arranged in the upper box body, the fan comprising a first air inlet towards the back and a second air inlet towards the front to quickly suck in the oil fume entering the top smoke inlet and the side smoke inlet.

[0028] Compared with the prior art, the advantages of the utility model lie in: by making the top smoke inlet be located at the rear side of the front panel and not higher than the front panel, the hiding of the top smoke inlet is realized in the front view angle of the user in the on-hook state, the frequent cleaning of the exposed part is avoided, the full hidden fume exhaust hood effect of the top smoke inlet is achieved, and in addition, the top smoke inlet is located at the downstream of the whole smoke collecting cavity, the oil fume has enough buffer space, the oil fume is buffered in the smoke collecting cavity to reduce the turbulence, and after flowing out from the rear side of the smoke collecting cavity, it reaches the top smoke inlet smoothly, and furthermore, the smoke collecting cavity is partially located at the rear side of the front panel, so that the oil liquid accumulated on the surface of at least part of the smoke collecting cavity can drop downwards to the second part to avoid flowing down directly from the front panel outer surface of the second part. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic view of the fume extractor of the utility model embodiment (side smoke inlet closed);

[0030] Figure 2 It is a sectional perspective view of the fume extractor of the utility model embodiment (side smoke inlet closed);

[0031] Figure 3 It is a sectional perspective view of the fume extractor of the utility model embodiment (side smoke inlet closed); Figure 2 It is a partial I enlarged schematic view of

[0032] Figure 4 It is a sectional side view of the fume extractor of the utility model embodiment (side smoke inlet closed);

[0033] Figure 5 It is a sectional view of the fume extractor of the utility model embodiment hiding the upper box body and the fan;

[0034] Figure 6 It is a partial II enlarged schematic view of Figure 5

[0035] Figure 7 It is a schematic view of the fume extractor of the utility model embodiment (side smoke inlet opened)。 DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present specification will be clearly and completely described in the embodiments of the present specification combined with the drawings in the embodiments of the present specification, obviously, the described embodiments are only part of the embodiments of the present specification, not all the embodiments. Based on the embodiments in the present specification, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of the present utility model protection.

[0037] ​It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application and the above drawings mean for the purpose of distinguishing between like elements and do not necessarily have to be taken in their given chronological order, unless mentioned otherwise. It should be understood that the embodiments of the present application described herein with reference to the drawings are illustrative in nature and that various changes could be made to the application by those skilled in the art, without departing from the scope of the application. That scope is, therefore, indicated by the appended claims, rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.

[0038] Various exemplary embodiments, features, and aspects of the disclosure will be described herein below with reference to the accompanying drawings. The same reference numbers in different drawings represent the same or similar elements. Although various aspects of embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0039] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.

[0040] The term "and / or", merely an associative relationship between the associated objects described, can mean that there are three kinds of relationship, for example, A and / or B, can mean: A alone, A and B exist at the same time, B alone, the three cases. In addition, the term "at least one" herein means any one of the plurality or at least two of any combination of more, for example, including at least one of A, B, C, can mean to include any one or more elements selected from the set consisting of A, B and C.

[0041] The specific angles, heights, widths, and the like values given in the specific embodiments below are all corresponding to the specific drawings.

[0042] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the specific embodiments below. Those skilled in the art should understand that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail, in order to highlight the main idea of the present disclosure.

[0043] Reference is made to Figures 1-7The range hood comprises an upper cabinet 1 and a smoke collecting cabinet 2 connected below the upper cabinet 1, the smoke collecting cabinet 2 comprises a first part 21 extending horizontally and a second part 22 extending longitudinally, the distance between the front end of the first part 21 and the wall where the range hood is installed is 370mm, so that the user will not feel oppressed and the probability of collision is reduced, the second part 22 extends downward from the rear side of the first part 21. Thus, the smoke collecting cabinet 2 is generally in the shape of "7". The second part 22, the first part 21 and the upper cabinet 1 are sequentially in fluid communication.

[0044] The first part 21 comprises a smoke collecting cover 211, which can be formed as the whole of the first part 21 or a part of the first part 21. The second part 22 has a front panel 221, which can be gradually inclined backward from top to bottom, and is usually formed by a glass panel and a metal panel support.

[0045] The smoke collecting cover 211 forms a smoke collecting cavity 2111 with an open bottom, which serves as a smoke collecting buffer. The top of the smoke collecting cover 211 forming the smoke collecting cavity 2111 comprises a first top plate 2112, a second top plate 2113 and a third top plate 2114, wherein the first top plate 2112 is gradually inclined downward from front to back, the third top plate 2114 is gradually inclined downward from front to back from the front end of the first top plate 2112, and the second top plate 2113 is gradually inclined downward from back to front from the rear end of the first top plate 2112 (in the installed state of the range hood, "front" refers to the side close to the user, and "back" refers to the side close to the installed wall). The rear end of the second top plate 2113 is located at the rear side of the front panel 221 of the second part 22. The shape of the smoke collecting cavity 2111 described above can achieve good flow guiding effect (to be described in detail below) and oil guiding effect, so that the oil adsorbed on the surface of the smoke collecting cover 211 can be collected and gathered backward along the first top plate 2112 and the second top plate 2113, and then flow downward along the inner wall of the second part 22, avoiding flowing down from the front surface of the front panel 221.

[0046] The smoke collection chamber 2111 is mostly located on the front side of the front panel 221 of the second part 22, and at least partially on the rear side of the front panel 221. The first part 21 has a top smoke inlet located outside the smoke collection chamber 2111, which is located on the rear side of the front panel 221 and lower than the smoke collection chamber 2111. In the oil fume flow path, the top smoke inlet is located downstream of the smoke collection chamber 2111 as a whole. This arrangement allows the top smoke inlet to be hidden from the front view when the unit is mounted, avoiding frequent cleaning of the exposed parts and improving the overall aesthetics, achieving a fully concealed oil fume absorption effect from the top smoke inlet. Moreover, it provides sufficient buffer space for the oil fumes, allowing them to be buffered within the smoke collection chamber 2111 to reduce turbulence, and then flow smoothly out from the rear side of the smoke collection chamber 2111 to the top smoke inlet. If the top smoke inlet is located inside the smoke collection chamber 2111, the oil fumes will immediately enter the top smoke inlet after their direction changes abruptly upon impacting the top of the smoke collection chamber 2111. This will result in a very chaotic flow of oil fumes at the top smoke inlet, thus affecting the smoke extraction effect.

[0047] The smoke collection chamber 2111, as described above, has an overall height that gradually increases and then decreases from front to back. The three top panels are of equal length along the left-right direction of the range hood. The first top panel 2112 is on the horizontal plane (…). Figure 4 The projected area of ​​the third top plate 2114 on the horizontal plane M1 is S1 (shown as dashed line M1 in the sectional view), the projected area of ​​the second top plate 2113 on the horizontal plane M1 is S2, and the projected area of ​​the third top plate 2114 on the horizontal plane M1 is S3. See the dividing line of the projected areas of the three top plates. Figure 4 As shown by the dashed lines N1 and N2 in the figure, the projection direction is shown in the figure. Figure 4 As indicated by arrow F1, all are orthographic projections, and the condition S1>S3>S2 is satisfied. That is, the first top plate 2112 has the largest projected area, ensuring effective smoke collection over its covered area. The third top plate 2114 is located near the front end of the first part 21 of the smoke collection box 2. Its larger projected area is because smoke collection and guidance begin here. The slope shortens the smoke path, and the radial distribution of negative pressure on the slope provides greater negative pressure, ensuring that smoke near the front is guided from the space under the third top plate 2114 into the space under the first top plate 2112, preventing smoke escape. Smoke enters the top smoke inlet from the space under the second top plate 2113. The second top plate 2113 has a smaller projected area, minimizing the path before the top smoke inlet. Based on the tilt characteristics of each top plate and the overall structure, more preferably, the three projected areas satisfy the following relationship: 0.15S1≤S2+S3≤0.9S1.

[0048] The plane containing the bottom of the smoke collection chamber 2111, that is, the bottom surface of the smoke collection chamber 2111, is... Figure 5The cross-section view shown in dashed line M2 shows that each top plate is an equal-thickness plate member, the surface is a plane, the angle between the third top plate 2114 and the plane M2 is α, and 20°≤α≤60° is satisfied, and the angle between the second top plate 2113 and the plane M2 is β, and 30°≤β≤80° is satisfied. The inclination of the second top plate 2113 and the third top plate 2114 is relatively gentle and extends a certain width, so that the oil fume in front of the smoke hood 211 can enter the smoke cavity 2111 gently, and be guided to the top smoke inlet at the rear, otherwise the third top plate 2114 has a relatively large inclination, and the oil fume entering the smoke cavity 2111 from the front of the smoke hood 211 will not be slowed down obviously, and the oil fume will escape from the front after colliding with the first top plate 2112 and turning quickly, which will cause airflow turbulence. The second top plate 2113 also has a certain inclination to make the oil fume transition from the smoke cavity 2111 to the top smoke inlet.

[0049] In addition, the height from the intersection of the first top plate 2112 and the second top plate 2113 to the bottom surface M2 of the smoke cavity 2111 is H1, the height from the intersection of the first top plate 2112 and the third top plate 2114 to the bottom surface M2 of the smoke cavity 2111 is H2, and 1.2≤H2 / H1≤2 is satisfied. As described above, the angles are the same, so that the corresponding area of each top plate achieves the required effect of guiding the oil fume.

[0050] The top smoke inlet is not higher than the front panel 211, in this embodiment, the top smoke inlet is formed by the first folded edge 212 and the second folded edge 213, and the first folded edge 212 and the second folded edge 213 are both open hole plate member structures. The first folded edge 212 extends downward from the rear side end of the smoke hood 211 (the smoke cavity 2111 is usually formed by stretching, due to the limitation of the stretching process, the rear side end of the smoke hood 211 is the stretching plane located at the rear side of the rear side end of the second top plate 2113, rather than the rear side end of the second top plate 2113, and the plane where the rear side end of the smoke hood 211 is located is the bottom surface M2 of the smoke cavity 2111), and the second folded edge 213 is located below the first folded edge 212, and extends forward from the lower end of the first folded edge 212 to the rear side surface of the front panel 221. The front side end of the second folded edge 213 extends downward to form a third folded edge 214. The third folded edge 214 is tightly attached to the inner surface of the front panel 221 of the second part 22, and is fixed with the front panel 221. The smoke hood 211, the first folded edge 212, the second folded edge 213, and the third folded edge 214 can be integrally formed.

[0051] The included angle between the first folded edge 212 and the rear end of the fume hood 211 is A, and the selection of the included angle affects the distance of the first folded edge 212 to the oil path risk area (vertical drop to the front end of the side fume inlet 222). In order to reduce the risk of oil droplets and facilitate the processing of the punching difficulty, it is preferred to satisfy 75°≤A≤110°. The included angle formed between the first folded edge 212 and the second folded edge 213 is B. Based on the processability of demolding, it is avoided to form a concave structure that cannot be bent and demolded (the bending and demolding direction is shown by the arrow F2 in Figure 6 , which is parallel to the bottom surface M2 of the fume hood 211), and it satisfies B≥70°. The acute angle between the second folded edge 213 and the horizontal plane M1 is θ, and it satisfies θ≥0°, and more preferably θ≥12°, so as to facilitate the downward guiding of the oil flowing down from the first folded edge 212. The third folded edge 214 is parallel to the front panel 221 of the second part 22, which can ensure more contact surface after installation with the front panel 221, ensure the subsequent welding with the left and right connecting structures, and better support the front panel 221, and can play a better supporting role when the user cleans and presses.

[0052] As described above, the first folded edge 212 and the second folded edge 213 are both perforated plate parts. The first folded edge 212 has at least two first fume inlets 2121 arranged in the left and right directions of the range hood, and the second folded edge 213 has at least two second fume inlets 2131 arranged in the left and right directions of the range hood. The first folded edge 212 constitutes a first fume inlet part of the top fume inlet, and the second folded edge 213 constitutes a second fume inlet part of the top fume inlet. Through the arrangement of the fume inlets as above, on the one hand, the air inlet area requirement is ensured, thereby ensuring the performance and oil fume suction effect, and on the other hand, the interval arrangement of the fume inlets relative to the overall long strip fume inlet arrangement has better strength, improves the stability of the structure and the consistency of the part material state, thereby ensuring the reliability of the oil fume suction effect.

[0053] Since the first fume inlet 2121 is located at the rear side of the fume collecting cavity 2111 and is lower than the fume collecting cavity 2111, part of the oil fume flows out (is guided backward and downward) from the fume collecting cavity 2111, flows out smoothly from the first fume inlet 2121 backward, and after turning inside the first part 21, enters the fan 3 arranged in the upper box body 1 upward, which can reduce the loss caused by the flow direction mutation of the oil fume passing through the first fume inlet 2121. A small part of the oil fume passes through the second fume inlet 2131 downward into the inside of the second part 22, and the oil fume entering the second part 22 rises upward, and the arrangement of the second fume inlet 2131 can avoid the oil fume that has not been guided to the first fume inlet 2121 from accumulating in the space formed by the first folded edge 212, the second folded edge 213 and the front panel 221 to form a vortex, and timely guide this part of the oil fume out to avoid affecting the normal discharge of the oil fume from the first fume inlet 2121 and the noise that may be caused thereby.

[0054] In the present embodiment, the corresponding smoke inlet is formed by the opening of the plate member, alternatively, the smoke inlet can be formed by the space between the smoke collecting cover 2111 and the second part 22 without setting a physical plate member.

[0055] The front panel 221 of the second part 22 of the smoke collecting box 2 is provided with a side smoke inlet 222, and the oil fume mainly enters the smoke collecting box 2 from the side smoke inlet 222. The oil fume that is not sucked into the side smoke inlet 222 rises upward until it reaches the smoke collecting cavity 2111 and is then sucked from the top smoke inlet. A smoke baffle 4 can be provided on the smoke collecting box 2, which can open and close the side smoke inlet 222. In the present embodiment, the smoke baffle 4 is opened and closed in a flip motion. The closed state is shown in Figure 1 , and the open state is shown in Figure 7 .

[0056] The fan 3 is arranged in the upper box 1. In the present embodiment, the fan 3 includes a volute 31, an impeller 32 arranged in the volute 31, and a motor 33 for driving the impeller 32 to rotate. The volute 31 includes oppositely arranged first and second cover plates 311 and 312, and the first cover plate 311 is located at the rear side of the second cover plate 312. The fan 3 is a double-inlet centrifugal fan, which includes a first inlet 341 facing the rear side and a second inlet 342 facing the front side. The first inlet 341, as the main inlet, is arranged on the first cover plate 311, and the second inlet 342, as the auxiliary inlet, is arranged on the second cover plate 312, forming a back-suction form. The first channel Q1 is formed between the first cover plate 311 and the rear side wall of the upper box 1, and the second channel Q2 is formed between the second cover plate 312 and the front side wall of the upper box 1. The depth (the size in the front-rear direction) of the first channel Q1 is D1, and the depth of the second channel Q2 is D2. The third channel Q3 is formed between the first top plate 2112 of the smoke collecting cover 211 and the bottom of the volute 31. Since the bottom of the volute 31 is substantially horizontal, and the first top plate 2112 is inclined, the cross-sectional area of the third channel Q3 gradually decreases from the rear to the front, and the flow direction suddenly changes at the intersection of the second channel Q2 and the third channel Q3, i.e., the oil fume suddenly changes from flowing from the rear to the front in the third channel Q3 to flowing upward in the second channel Q2. Since the oil fume has a long path from the top smoke inlet to the second channel before reaching the second channel, the third channel Q3 forms a Venturi channel, so that the oil fume entering the range hood from the rear side of the third channel Q3 can accelerate into the second channel Q2 on the front side along the third channel Q3, to promote the oil fume to be sucked into the fan 3 from the second channel Q2.

[0057] Based on the overall size of the range hood and the size limitation of the volute 31, the three passages formed by the positional relationship of the volute 31 and the positional relationship of the distribution of the smoke collecting hood 211 will affect the overall oil fume suction efficiency, oil fume suction effect and noise. The height between the rear end of the first top plate 2112 and the bottom of the volute 31 is L1, and the height between the front end of the first top plate 2112 and the bottom of the volute 31 is L2. In this embodiment, the back suction scheme is adopted, and while ensuring the smoothness of the first passage Q1 at the back, the ventilation of the second passage Q2 at the front side is also considered to avoid the gap being too small to cause the noise level to rise due to the sudden change of flow rate through the narrow gap. The size needs to satisfy the following relationship: 1≤L2 / D2≤4, 1≤D1 / D2≤8. Among them, 1≤L2 / D2≤4 can limit the airflow turning at the front side without too much cross-sectional area change, and 1≤D1 / D2≤8 mainly limits the working condition of back suction. The air inlet path of the first passage Q1 at the back is relatively shorter than that at the front side, and has higher oil fume suction efficiency.

[0058] The projection area of the volute 31 on the horizontal plane M1 is S4, and the projection direction is shown by the arrow F1 in Figure 4 The overlapping area of the projection of the volute 31 and the first top plate 2112 on the horizontal plane M1 is S5, and satisfies S5 / S4≥60%. The projection area overlap ratio limits the positional relationship between the volute 31 and the smoke collecting hood 211, to a certain extent, limits the positional relationship between the rear oil fume entry point and the first air inlet 341 of the fan 3, thereby limiting the movement path of the oil fume, and further improving the oil fume suction effect; at the same time, at the front side, the end point distance of the oil fume guided along the upper surface of the first top plate 2112 through the third passage Q3 is limited, thereby limiting the positional relationship between the oil fume after separating from the front side smoke guiding surface and the second air inlet 342 at the front side of the volute, thereby limiting the movement path of the oil fume, and further improving the oil fume suction effect. The intersection of the first top plate 2112 and the third top plate 2114 is projected on the horizontal plane M1 within the projection of the second passage Q2 on the horizontal plane M1, so that the oil fume can be guided by the first top plate 2112 to turn into the second passage Q2.

[0059] The oil liquid on the lower surface of the smoke hood 211 is collected to the rear end, part of which flows along the front surface of the first folded edge 212 and the upper surface of the second folded edge 213, passes through the second smoke inlet hole 2131 to flow along the lower surface of the second folded edge 213, part of which passes through the first smoke inlet hole 2121 to flow along the rear surface of the first folded edge 212 and the lower surface of the second folded edge 213, and then flows downward along the third folded edge 214, the rear surface of the front panel 221, and is collected into the oil cup 5 arranged at the bottom of the smoke collecting box 2. The oil liquid dropped on the upper surface of the smoke hood 211 by the fan 3 is collected to the rear end, flows along the rear surface of the first folded edge 212 and the lower surface of the second folded edge 213, and then flows downward along the third folded edge 214 and the rear surface of the front panel 221, and is collected into the oil cup 5 arranged at the bottom of the smoke collecting box 2. When the oil liquid passes through the second smoke inlet hole 2131 of the second folded edge 213, even if it drops from the second smoke inlet hole 2131, it can be collected inside the second part 22.

[0060] The "fluid communication" referred to in the utility model refers to the spatial positional relationship between two components or parts (hereinafter referred to as the first part and the second part respectively), i.e. the fluid (gas, liquid or mixture of the two) can flow or / and be transported from the first part to the second part along the flow path, which can be directly connected between the first part and the second part, or indirectly connected between the first part and the second part through at least one third party, which can be a fluid passage such as a pipeline, a channel, a conduit, a flow guide, a hole, a groove, etc., or a chamber allowing fluid to flow or a combination thereof.

Claims

1. A range hood comprising a fume collecting box (2), the fume collecting box (2) comprising: a first part (21) extending laterally, comprising a fume collecting cover (211) and a top fume inlet, the fume collecting cover (211) forming a fume collecting cavity (2111) with a bottom opening therein; and a second part (22) extending longitudinally, located below the first part (21), the second part (22) comprising a front panel (221), the front panel (221) forming a side fume inlet (222) thereon; characterized in that: the fume collecting cavity (2111) is located at least partially on the front side of the front panel (221) and at least partially on the rear side of the front panel (221), and the top fume inlet is located on the rear side of the front panel (221) and is not higher than the front panel (221).

2. The hood according to claim 1, characterized in that: In the fume flow path, the top fume inlet is located downstream of the fume collecting cavity (2111) as a whole.

3. The hood according to claim 2, characterized in that: The top fume inlet comprises a first fume inlet portion, which is located on the rear side of the fume collecting cavity (2111) and below the fume collecting cavity (2111).

4. The hood according to claim 3, characterized in that: The top surface of the fume collecting cover (211) constituting the fume collecting cavity (2111) comprises a first top plate (2112) and a second top plate (2113), the first top plate (2112) gradually slopes downward from front to rear, and the second top plate (2113) gradually slopes downward from the rear end of the first top plate (2112) to the rear.

5. The hood according to claim 4, characterized in that: The first part (21) further comprises a first folded edge (212) constituting the first fume inlet portion, the first folded edge (212) being a perforated plate member, and the first folded edge (212) extends downward from the rear end of the fume collecting cover (211).

6. The hood according to claim 5, characterized in that: The top fume inlet further comprises a second fume inlet portion, which is located below the first fume inlet portion.

7. The hood according to claim 6, characterized in that: The first part (21) further comprises a second folded edge (213) constituting the second fume inlet portion, the second folded edge (213) also being a perforated plate member, and the second folded edge (213) extends forward to the front panel (221) from the lower end of the first folded edge (212).

8. The hood according to claim 7, characterized in that: The front end of the second folded edge (213) extends downward to form a third folded edge (214), which is tightly attached to the inner surface of the front panel (221) of the second part (22) and is fixed to the front panel (221).

9. The hood according to claim 7, characterized in that: The included angle formed between the first folded edge (212) and the second folded edge (213) is B, and B≥90° is satisfied.

10. The hood according to claim 7, characterized in that: The acute included angle between the second folded edge (213) and the horizontal plane (M1) is θ, and θ≥12° is satisfied.

11. The hood according to claim 7, characterized in that: The first folded edge (212) has at least two first fume inlet holes (2121) arranged at intervals in the left-right direction of the range hood, and the second folded edge (213) has at least two second fume inlet holes (2131) arranged at intervals in the left-right direction of the range hood.

12. The hood according to claim 5, characterized in that: The included angle between the first folded edge (212) and the rear end of the fume collecting cover (211) is A, and 75°≤A≤110° is satisfied.

13. The hood according to claim 5, characterized in that: The first part (21) further comprises a second fold (213) extending forward from the lower end of the first fold (212) to the front panel (221).

14. The hood according to claim 3, characterized in that: The top smoke inlet further comprises a second smoke inlet portion located below the first smoke inlet portion.

15. The hood according to claim 2, characterized in that: The top surface of the smoke collecting cover (211) constituting the smoke collecting cavity (2111) comprises a first top plate (2112), a second top plate (2113) and a third top plate (2114), the first top plate (2112) gradually inclines downward from front to back, the second top plate (2113) gradually inclines downward from back to front at the rear end of the first top plate (2112), and the third top plate (2114) gradually inclines downward from front to back at the front end of the first top plate (2112).

16. The hood according to claim 15, characterized in that: The projection area of the first top plate (2112) on the horizontal plane (M1) is S1, the projection area of the second top plate (2113) on the horizontal plane (M1) is S2, and the projection area of the third top plate (2114) on the horizontal plane (M1) is S3, and S1>S3>S2.

17. The hood according to claim 16, characterized in that: The included angle between the third top plate (2114) and the bottom surface (M2) of the smoke collecting cavity (2111) is α, and 20°≤α≤60°, and the included angle between the second top plate (2113) and the bottom surface (M2) of the smoke collecting cavity (2111) is β, and 30°≤β≤80°.

18. The hood according to claim 1, characterized in that: The range hood further comprises an upper box (1) connected to the smoke collecting box body (2) and a fan (3) arranged in the upper box (1), the fan (3) comprises a first air inlet (341) facing the rear side and a second air inlet (342) facing the front side.

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