Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood and a top exhaust fume inlet, and an exhaust fume collecting cavity with an opening in the bottom surface is formed in the exhaust fume collecting hood; on the oil smoke flowing path, the top smoke inlet is located outside the smoke collecting cavity and located on the downstream of the whole smoke collecting cavity. Compared with the prior art, the range hood has the advantages that due to the arrangement of the smoke inlet, oil smoke can have enough buffer space, the oil smoke is buffered in the smoke collecting cavity so as to reduce turbulent flow, and then the oil smoke smoothly reaches the top smoke inlet after flowing out from the rear side of the smoke collecting cavity, so that the oil smoke suction effect is improved.

Description

TECHNICAL FIELD

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

[0002] The oil fume extractor has become one of the kitchen household electrical appliances in modern family. The oil fume extractor is various at present, including side suction type, top suction type and '7' type with top and side double suction. Among them, the top and side double suction oil fume extractor or the top suction type oil fume extractor, the top smoke inlet is usually arranged in the smoke collecting cavity, such as the Chinese patents with the application numbers of 202221995059.5 and 202323611622.1.

[0003] The existing oil fume extractor, the oil fume hits the smoke collecting cavity top direction mutation and enters the smoke inlet immediately, and the oil fume flow direction at the smoke inlet is very disorderly, which affects the oil fume suction effect. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem that the oil fume extractor is provided, the oil fume reaches the smoke inlet smoothly through the smoke collecting cavity, and the oil fume suction effect is improved.

[0005] The utility model adopts the technical scheme that an oil fume extractor includes a smoke collecting cover and a top smoke inlet, and the smoke collecting cover forms a smoke collecting cavity with an open bottom surface.

[0006] On the oil fume flow path, the top smoke inlet is located outside the smoke collecting cavity and downstream of the whole smoke collecting cavity.

[0007] The top smoke inlet is arranged in this way, so that the oil fume has sufficient buffer space, the oil fume is buffered in the smoke collecting cavity to reduce turbulence, and then flows out from the rear side of the smoke collecting cavity and reaches the top smoke inlet smoothly, thereby improving the oil fume suction effect.

[0008] Further, to reduce the mutation of the oil fume path and guide the oil fume to enter, the top smoke inlet includes a first smoke inlet part, and the first smoke inlet part is located at the rear side of the smoke collecting cavity and below the smoke collecting cavity.

[0009] Further, the top surface of the smoke collecting cover constituting the smoke collecting cavity includes a first top plate and a second top plate, the first top plate is inclined downward from front to rear, and the second top plate is inclined downward from the rear end of the first top plate, thereby guiding the oil liquid on the surface of the smoke collecting cavity rearward, ensuring that the oil liquid drops into the second part, and guiding the oil fume rearward and downward to cooperate with the first smoke inlet part below the rear side of the smoke collecting cavity, pass through the first smoke inlet part, and reduce the mutation of the oil fume path as much as possible.

[0010] Further, the top surface of the smoke hood constituting the smoke collecting cavity further comprises a third top plate, the third top plate is gradually inclined downward from the front side end of the first top plate, and the height of the smoke collecting cavity gradually increases from front to back and then gradually decreases. The smoke collecting cavity arranged as above can have good flow guiding effect and oil guiding effect, so that the oil liquid adsorbed on the surface of the smoke hood is gathered and collected backward along the first top plate and the second top plate, and flows downward along the second part of the inner wall surface, thereby avoiding flowing down from the front surface of the front plate.

[0011] 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 is satisfied. The projection area of the first top plate is the largest, which can ensure that the effective smoke collection area is covered, the third top plate is the area close to the front side end, and the projection area is larger because the smoke is collected and guided from here. The inclined surface can make the oil fume path shorter, and the negative pressure is distributed like a beam, which has a larger negative pressure part, so that the oil fume close to the front side can be guided into the space below the first top plate from the space below the third top plate, and the oil fume cannot 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.

[0012] Preferably, the three projection areas satisfy the following relationship: 0.15S1≤S2+S3≤0.9S1.

[0013] Further, the angle between the third top plate and the bottom surface M2 of the smoke collecting cavity is α, and 20°≤α≤60° is satisfied; the angle between the second top plate and the bottom surface M2 of the smoke collecting cavity is β, and 30°≤β≤80° is satisfied. 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 hood can enter the smoke collecting cavity smoothly and be guided to the top smoke inlet at the rear. Otherwise, the oil fume reduction effect is not obvious when the inclination of the third top plate is relatively large. After the oil fume in front of the smoke hood enters the smoke collecting cavity, it rapidly turns after hitting the first top plate, which causes airflow turbulence, and the oil fume escapes 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 collecting cavity to the top smoke inlet.

[0014] Further, the height from the joint of the first top plate and the second top plate to the bottom surface of the smoke collecting cavity is H1, and the height from the joint of the first top plate and the third top plate to the bottom surface of the smoke collecting cavity is H2, and 1.2≤H2 / H1≤2 is satisfied. 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 hood can enter the smoke collecting cavity smoothly and be guided to the top smoke inlet at the rear.

[0015] Further, in order 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 part located below the first smoke inlet part.

[0016] Further, the range hood further comprises a first folded edge constituting the first smoke inlet part and a second folded edge constituting the second smoke inlet part, both of which are perforated plate parts, the first folded edge extends downward from the rear end of the smoke collecting hood, and the second folded edge extends forward from the lower end of the first folded edge. By arranging the first folded edge, the first smoke inlet part can be conveniently formed, and the oil on the upper surface of the smoke collecting cavity can be guided downward. By arranging the second folded edge, the second smoke inlet part can be conveniently formed, so that the oil fume that has not been guided to the first smoke inlet part is prevented from accumulating and forming a vortex, and the oil fume is guided out in time to prevent the oil fume from affecting the normal discharge of the oil fume from the first smoke inlet part and the noise caused thereby. Meanwhile, the oil on the first folded edge can be guided downward to prevent splashing in the smoke collecting box.

[0017] Compared with the prior art, the oil fume has sufficient buffer space by arranging the smoke inlet on the outside and downstream of the smoke collecting cavity, the oil fume is buffered in the smoke collecting cavity to reduce turbulence, and then smoothly reaches the top smoke inlet after flowing out of the rear side of the smoke collecting cavity, thereby improving the oil fume suction effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic view of a range hood of an embodiment of the present application (side smoke inlet closed);

[0019] Figure 2 FIG. 2 is a cross-sectional perspective view of the range hood of the embodiment of the present application (side smoke inlet closed);

[0020] Figure 3 FIG. 3 is a partial I enlarged schematic view of Figure 2 ;

[0021] Figure 4 FIG. 4 is a cross-sectional side view of the range hood of the embodiment of the present application (side smoke inlet closed);

[0022] Figure 5 FIG. 5 is a cross-sectional view of the range hood of the embodiment of the present application hiding the upper box body and the fan;

[0023] Figure 6 FIG. 6 is a partial II enlarged schematic view of Figure 5 ;

[0024] Figure 7 FIG. 7 is a schematic view of the range hood of the embodiment of the present application (side smoke inlet open). DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present specification will be described clearly and completely in the embodiments of the present specification in combination with the drawings in the embodiments of the present specification. Obviously, the described embodiments are only part of the embodiments of the present specification, rather than all the embodiments. Based on the embodiments in the present specification, all other embodiments obtained by those skilled in the art without creative work belong to the scope of the present specification.

[0026] It should be noted that the terms "first", "second" and the like in the description and claims of the present specification and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present specification described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or server including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings represent functionally identical or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0028] The word "exemplary" is used herein in the sense of being an example, illustration, or demonstration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

[0029] The term "and / or" herein is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B and C can mean including any one or more elements selected from the set consisting of A, B and C.

[0030] The specific angles, heights, widths and the like given in the specific embodiments below are all corresponding to the corresponding measurement of the specific drawings.

[0031] In addition, for a better understanding of the present disclosure, numerous specific details are given in the following detailed description. One skilled in the art will understand that the present disclosure can be practiced without certain specific details. In some instances, well-known methods, structures, elements, and circuits have not been described in detail in order to avoid obscuring the subject matter.

[0032] Referring to Figures 1-7 An extractor 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 transversely and a second part 22 extending longitudinally, the distance between the front end of the first part 21 and the wall surface on which the extractor 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 as a whole forms a "7" shape. The second part 22, the first part 21 and the upper cabinet 1 are sequentially in fluid communication.

[0033] The first part 21 comprises a smoke collecting cover 211, which can be formed as the whole of the first part 21 or as 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.

[0034] 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 extractor hood, "front" refers to the side close to the user, and "back" refers to the side close to the installed wall surface). 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 above-mentioned smoke collecting cavity 2111 can achieve good flow guiding effect (to be described in detail below) and oil guiding effect, so that the oil liquid adsorbed on the surface of the smoke collecting cover 211 is gathered and collected backward along the first top plate 2112 and the second top plate 2113, and flows downward along the inner wall of the second part 22, avoiding flowing down from the front surface of the front panel 221.

[0035] 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.

[0036] 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.

[0037] 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 gently.

[0038] 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.

[0039] 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.

[0040] The acute angle between the second fold edge 213 and the horizontal plane M1 is θ, and θ≥0°, more preferably θ≥12°, so as to facilitate the downward guiding of the oil liquid flowing down the first fold edge 212. The third fold edge 214 is parallel to the front panel 221 of the second part 22, which can ensure more contact area after being installed with the front panel 221, guarantee the subsequent welding with the left and right connecting structures, and better support the front panel 221, so as to better support the front panel 221 during the user's cleaning pressing.

[0041] As described above, the first fold edge 212 and the second fold edge 213 are both perforated plate parts. The first fold edge 212 has at least two first smoke inlets 2121 arranged in the left-right direction of the range hood, and the second fold edge 213 has at least two second smoke inlets 2131 arranged in the left-right direction of the range hood. The first fold edge 212 constitutes a first smoke inlet part of the top smoke inlet, and the second fold edge 213 constitutes a second smoke inlet part of the top smoke inlet. Through the arrangement of the smoke inlets as above, on the one hand, the air inlet area requirement is guaranteed, thereby guaranteeing the performance and oil fume suction effect, and on the other hand, the interval arrangement of the smoke inlets relative to the overall long strip smoke inlet arrangement has better strength, improves the stability of the structure and the consistency of the part material state, thereby guaranteeing the reliability of the oil fume suction effect.

[0042] Since the first smoke inlets 2121 are located at the rear side of the smoke collecting cavity 2111 and are lower than the smoke collecting cavity 2111, part of the oil fume flows out (is guided backward and downward) from the smoke collecting cavity 2111, smoothly flows out backward from the first smoke inlets 2121, and after turning inside the first part 21, enters the fan 3 arranged in the upper cabinet 1 upward, which can reduce the loss caused by the flow direction mutation of the oil fume passing through the first smoke inlets 2121. A small part of the oil fume passes through the second smoke inlets 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 smoke inlets 2131 can avoid the oil fume that has not been guided to the first smoke inlets 2121 from accumulating in the space formed by the first fold edge 212, the second fold edge 213 and the front panel 221 to generate vortex, and timely guide this part of the oil fume out to avoid affecting the normal discharge of the oil fume from the first smoke inlets 2121 and the noise that may be caused thereby.

[0043] The front panel 221 of the second part 22 of the smoke collecting cabinet 2 is provided with a side smoke inlet 222, and the oil fume mainly enters the smoke collecting cabinet 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 sucked in from the top smoke inlet. A smoke baffle 4 can be arranged on the smoke collecting cabinet 2, which can open and close the side smoke inlet 222. In this embodiment, the smoke baffle 4 is opened and closed in a flip motion, and the closed state is shown in Figure 1 , and the open state is shown in Figure 7 .

[0044] In the embodiment, the fan 3 comprises a volute 31, an impeller 32 arranged in the volute 31, and a motor 33 for driving the impeller 32 to rotate. The fan 3 is a double-inlet centrifugal fan, comprising a first inlet 341 towards the rear side and a second inlet 342 towards the front side.

[0045] The oil liquid on the lower surface of the smoke hood 211 is collected to the rear end, flows along the front surface of the first folding edge 212 and the upper surface of the second folding edge 213, passes through the second smoke inlet hole 2131 to flow along the lower surface of the second folding edge 213, part of the oil liquid passes through the first smoke inlet hole 2121 to flow along the rear surface of the first folding edge 212 and the lower surface of the second folding edge 213, and then flows downward along the third folding edge 214 and the rear surface of the front panel 221 until being 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 is collected to the rear end, flows along the rear surface of the first folding edge 212 and the lower surface of the second folding edge 213, and then flows downward along the third folding edge 214 and the rear surface of the front panel 221 until being 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 folding edge 213, even if it drops from the second smoke inlet hole 2131, it can be collected inside the second part 22.

[0046] In the embodiment, the oil extractor hood shown is of the top-side double-suction type. Alternatively, the above-mentioned smoke collecting cavity structure can also be used in the top-suction type oil extractor hood.

[0047] The "fluid communication" referred to in the utility model refers to the spatial positional relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), 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. It 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. An extractor hood, comprising a hood (211) and a top inlet, a smoke collecting cavity (2111) with a bottom opening being formed in the hood (211); characterized in that: the top inlet is located outside the smoke collecting cavity (2111) and downstream of the whole smoke collecting cavity (2111) in a smoke flow path.

2. The hood according to claim 1, characterized in that: the top inlet comprises a first inlet part located at a rear side of the smoke collecting cavity (2111) and below the smoke collecting cavity (2111).

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

4. The hood according to claim 3, characterized in that: the top surface of the hood (211) constituting the smoke collecting cavity (2111) further comprises a third top plate (2114) gradually inclined downward from a front end of the first top plate (2112) to front, and a height of the smoke collecting cavity (2111) gradually increases from front to rear and then gradually decreases.

5. The hood according to claim 4, characterized in that: a projection area of the first top plate (2112) on a horizontal plane (M1) is S1, a projection area of the second top plate (2113) on the horizontal plane (M1) is S2, and a projection area of the third top plate (2114) on the horizontal plane (M1) is S3, and S1>S3>S2 is satisfied.

6. The hood according to claim 5, characterized in that: the three projection areas satisfy the following relationship: 0.15S1≤S2+S3≤0.9S1.

7. The hood according to claim 4, characterized in that: an angle between the third top plate (2114) and a bottom surface (M2) of the smoke collecting cavity (2111) is α, and 20°≤α≤60° is satisfied; an angle between the second top plate (2113) and the bottom surface (M2) of the smoke collecting cavity (2111) is β, and 30°≤β≤80° is satisfied.

8. The hood according to claim 4, characterized in that: a height from an intersection of the first top plate (2112) and the second top plate (2113) to the bottom surface (M2) of the smoke collecting cavity (2111) is H1, a height from an intersection of the first top plate (2112) and the third top plate (2114) to the bottom surface (M2) of the smoke collecting cavity (2111) is H2, and 1.2≤H2 / H1≤2 is satisfied.

9. The hood according to claim 1, characterized in that: the top inlet further comprises a second inlet part located below the first inlet part.

10. The hood according to claim 9, characterized in that: the extractor hood further comprises a first folded edge (212) constituting the first inlet part and a second folded edge (213) constituting the second inlet part, the first folded edge (212) and the second folded edge (213) are both open plate members, the first folded edge (212) extends downward from a rear end of the hood (211), and the second folded edge (213) extends forward from a lower end of the first folded edge (212).

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