Centrifugal fan for exhausting oil smoke and smoke exhaust ventilator

Abstract

The utility model provides an improved range hood and a centrifugal fan for exhausting oil smoke. The centrifugal fan comprises a volute, a motor and an impeller, the volute comprises a first side wall, a second side wall and an annular wall, and the annular wall is connected between the first side wall and the second side wall and comprises sound absorption cotton and a fixing part; the fixed part is arranged to be detachably fixed on the volute; when the fixing piece is fixed to the volute, the fixing piece extrudes and fixes the sound absorption cotton to the outer surface of the annular wall. Therefore, the sound-absorbing cotton can be conveniently fixed on the outer surface of the annular wall.

Description

Technical field

[0001] The present application relates to the field of range hoods, and in particular to a centrifugal fan for extracting and exhausting oil fumes. [Background Technology]

[0002] In Asia, due to the traditional cooking habit of stir-frying, cooking fumes are particularly high in grease. Therefore, range hoods, which extract cooking fumes, have become an essential household appliance. As people's expectations for quality of life continue to rise, range hoods are also undergoing continuous upgrades and improvements.

[0003] To reduce noise and improve user experience, some range hoods have been equipped with sound-absorbing cotton. For example, the cotton can be placed inside the range hood's centrifugal fan to reduce the noise generated by the fan. However, existing solutions typically adhere the cotton to the fan, making it difficult to remove and replace. Furthermore, adhesive bonding makes it difficult to pass the needle flame test, posing a safety hazard.

[0004] Unless there is sufficient evidence to support it, the prior art described herein does not mean that these prior art are known to ordinary technicians in the field related to this application before the filing date of this application. [Summary of the invention]

[0005] One purpose of the embodiments of the present application is to propose an improved range hood and a centrifugal fan for extracting and exhausting oil fumes, in response to at least one of the above technical problems and / or other possible technical problems not mentioned in the present application.

[0006] According to a first aspect of the present application, an embodiment of the present application provides a centrifugal fan for extracting oil fumes, comprising a volute, a motor, and an impeller. The volute comprises a first sidewall, a second sidewall, and an annular wall. The annular wall is disposed between the first and second sidewalls and comprises sound-absorbing cotton and a fixing member. The fixing member is configured to be detachably fixed to the volute. When the fixing member is fixed to the volute, the fixing member presses the sound-absorbing cotton to the outer surface of the annular wall. Thus, the sound-absorbing cotton is conveniently fixed to the outer surface of the annular wall.

[0007] In one or some embodiments, the fixing member includes a first edging member and a second edging member; the first edging member is covered on the connecting corners between the first side wall and the annular wall, and covers and blocks the first side of the sound-absorbing cotton; the second edging member is covered on the connecting corners between the second side wall and the annular wall, and covers and blocks the second side of the sound-absorbing cotton.

[0008] In one or some embodiments, the first edging member is provided with screw holes suitable for fixing the first edging member to the volute; and / or

[0009] The second edge wrapping member is provided with screw holes adapted to fix it to the volute; and / or

[0010] The first edge wrapping member is provided with a first snap, which is arranged to be adapted to clip onto the corresponding connecting edge; and / or

[0011] The second edge wrapping member is provided with a second snap, which is arranged to be adapted to clip onto the corresponding connecting edge; and / or

[0012] The first edge wrapping member is provided with a first elastic sheet, which is arranged to be adapted to press against the first side wall; and / or

[0013] The second edge wrapping member is provided with a second elastic sheet, which is arranged to be adapted to press against the second side wall.

[0014] In one or some embodiments, the fixing member includes a baffle adapted to press against the outer surface of the sound-absorbing cotton; one end of the baffle is detachably fixed to the connecting edge between the first side wall and the annular wall, and the other end is detachably fixed to the connecting edge between the second side wall and the annular wall.

[0015] In one or some embodiments, the baffle is provided with fins; the ends of the fins are arranged to be adapted to pass through the sound-absorbing cotton and then be bent to abut against the inner surface of the sound-absorbing cotton. The provision of the fins enables the baffle to be integrated into the sound-absorbing cotton, facilitating assembly.

[0016] In one or some embodiments, one end of the baffle is fixed by a snap structure, and the other end is fixed by a snap structure; or

[0017] One end of the baffle is fixed by a snap structure, and the other end is fixed by a jack structure; or

[0018] One end of the baffle is fixed by screws or rivets, and the other end is fixed by a jack structure; or

[0019] One end of the baffle is fixed by screws or rivets, and the other end is fixed by screws or rivets.

[0020] In one or some embodiments, the number of the baffles is at least two; each of the baffles is arranged at intervals in sequence along the extending direction of the sound-absorbing cotton. Thus, each baffle presses against the outer surface of the sound-absorbing cotton together, thereby firmly pressing and fixing the sound-absorbing cotton to the outer surface of the annular wall.

[0021] In one or some embodiments, a fixing bracket for installing and fixing the centrifugal fan is included; the fixing bracket is integrally formed with a fixing pressing piece, which is arranged to be suitable for pressing on the outer surface of the sound-absorbing cotton. Thus, it helps to improve the integration degree of components, which can not only save space but also reduce costs.

[0022] In one or some embodiments, the annular wall is completely covered and blocked by the sound-absorbing cotton.

[0023] In one or some embodiments, the annular wall is provided with an oil leakage hole; the sound-absorbing cotton is provided with an oil guiding through hole; the oil leakage hole and the oil guiding through hole are arranged in sequence from top to bottom.

[0024] According to the second aspect of the present application, embodiments of the present application provide a range hood, including the centrifugal fan as described in any one of the above.

[0025] It should be noted here that the directional expressions such as "from top to bottom", "bottom end", "bottom area", "opening upward", "above", "below", etc. in the present application, if not specifically stated, are based on the normal use state of the range hood.

[0026] It should be pointed out here that the "first" and "second" appearing in this specification are only for descriptive purposes, and are not used to indicate relative importance; moreover, it is not a definition of the quantity of the features it limits; in addition, it is not a definition of the logical relationship or sequential relationship of the features it limits.

[0027] The above technical solution content of the present application is not used to describe all possible implementation manners of the present application. Throughout the application, guidance is provided by listing examples in many places, and these examples can be used for various feasible combinations.

Description of the Drawings

[0028] The following drawings only schematically illustrate and explain the present application, and do not limit the scope of the present application, where:

[0029] Figure 1 is an exploded view of an embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0030] Figure 2 is a schematic structural diagram of a fixing member of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0031] Figure 3 is a schematic structural diagram of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0032] Figure 4 is a schematic structural diagram of a baffle of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0033] Figure 5 is a schematic structural diagram of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0034] Figure 6 is a schematic structural diagram of a baffle of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0035] Figure 7 is a schematic structural diagram of a volute of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0036] Figure 8 is a schematic structural diagram of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0037] Figure 9 is a schematic diagram of the assembly relationship between a baffle and a sound-absorbing cotton of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0038] Figure 10 is a schematic diagram of the assembly effect of a baffle and a sound-absorbing cotton of another embodiment of a centrifugal fan for exhausting oil fume in the present application;

[0039] Figure 11 is a schematic structural diagram of another embodiment of a centrifugal fan for exhausting oil fume in the present application when the sound-absorbing cotton is not installed;

[0040] Figure 12 is a schematic structural diagram of another embodiment of a centrifugal fan for exhausting oil fume in the present application.

[0041] Reference numerals:

[0042] 1 - First side wall, 2 - Second side wall, 3 - Ring wall, 4 - Electric heating film, 5 - Sound-absorbing cotton, 6 - Power supply wire, 7 - Heat insulation cover, 8 - Motor, 9 - Impeller, 10 - Fixed bracket, 11 - First edge wrapping member, 12 - Second edge wrapping member, 13 - First side edge, 14 - Second side edge, 15 - Baffle, 16 - Fins, 17 - Screw hole, 18 - Oil leakage hole, 19 - Oil guiding through hole, 20 - Fixed pressing piece, 21 - First elastic piece, 22 - Second elastic piece, 23 - Second buckle, 24 - Card seat, 25 - Jack, 26 - Insertion piece.

Detailed implementation manners

[0043] In order to make the technical problems to be solved, technical solutions and beneficial technical effects of this application more clearly understood, the following will further elaborate on this application in combination with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain this application, rather than to limit the protection scope of this application. And each embodiment may share the same view or multiple views for description, but all the features appearing in the same view cannot be interpreted as the features that must be possessed by an embodiment. On the contrary, as long as they are not mutually exclusive technically, they can be combined in any suitable way. Moreover, for the sake of simplicity, different embodiments in different aspects may be presented in the same specific design, however, this presentation does not mean that the embodiments in these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also consider the description in the specification and the content that can be directly and unambiguously determined by those skilled in the art based on the description in the specification.

[0044] Embodiment 1

[0045] This application proposes an embodiment of a centrifugal fan for exhausting oil fume, including a volute, a motor 8, an impeller 9, an electric heating film 4, a sound-absorbing cotton 5, a power supply wire 6, a heat insulation cover 7 and a fixing member, as Figure 1 shown. The volute includes a first side wall 1, a second side wall 2 and an annular wall 3, and the annular wall 3 is connected and arranged between the first side wall 1 and the second side wall 2.

[0046] The fixing member is arranged to be suitable for squeezing and fixing the sound-absorbing cotton 5 on the outer surface of the annular wall 3. The fixing member is arranged to be detachably fixed to the volute. When the fixing member is fixed to the volute, the fixing member squeezes and fixes the sound-absorbing cotton 5 on the outer surface of the annular wall 3. Thus, the sound-absorbing cotton 5 is conveniently fixed on the outer surface of the annular wall 3, which is convenient for assembly and easy to disassemble and replace the sound-absorbing cotton 5.

[0047] The fixing member includes a first edge wrapping member 11 and a second edge wrapping member 12. The first edge wrapping member 11 wraps around the connecting edge between the first side wall 1 and the annular wall 3 and wraps and covers the first side edge 13 of the sound-absorbing cotton 5. The second edge wrapping member 12 wraps around the connecting edge between the second side wall 2 and the annular wall 3 and wraps and covers the second side edge 14 of the sound-absorbing cotton 5. Specifically, the first edge wrapping member 11 is adapted to the contour of the corresponding connecting edge, as Figure 1 shown. The first edge wrapping member 11 and the second edge wrapping member 12 are both integrally injection-molded from plastic. Thus, both the first edge wrapping member 11 and the second edge wrapping member 12 have a certain elasticity, which is convenient for matching the contour of the corresponding connecting edge.

[0048] The second edge wrapping member 12 is adapted to the contour of the corresponding connecting edge angle. When the first edge wrapping member 11 wraps the connecting edge angle between the first side wall 1 and the annular wall 3, one end edge of the first edge wrapping member 11 abuts against the first side wall 1, and the other end edge of the first edge wrapping member 11 abuts against the annular wall 3. When the second edge wrapping member 12 wraps the connecting edge angle between the second side wall 2 and the annular wall 3, one end edge of the second edge wrapping member 12 abuts against the second side wall 2, and the other end edge of the second edge wrapping member 12 abuts against the annular wall 3. The first edge wrapping member 11 and the second edge wrapping member 12 are respectively located at both ends of the annular wall 3. A chamfer is provided at the bottom end of the first side wall 1. Correspondingly, a bevel surface is provided at the bottom end of the first edge wrapping member 11 and is adapted to abut and wrap the chamfer, as Figure 1 shown.

[0049] The sound-absorbing cotton 5 is a two-component sound-absorbing cotton and is composed of two kinds of fibers, namely PP (polypropylene) and PET (polyester). The two-component sound-absorbing cotton has good sound absorption and noise reduction effects. However, the cotton is likely to run out at the edge cut, and moreover, grease is likely to enter the two-component sound-absorbing cotton through the edge cut, affecting its service life. By adopting the technical solution of the present application, the first edge wrapping member 11 wraps and shields the first side edge 13 of the sound-absorbing cotton 5, and the second edge wrapping member 12 wraps and shields the second side edge 14 of the sound-absorbing cotton 5. Thus, it helps to reduce or avoid the running out of cotton and effectively prevents or reduces the entry of grease into the sound-absorbing cotton 5 through the edge cut. In addition, one end of the sound-absorbing cotton 5 abuts against the volute tongue of the volute casing, and the other end of the sound-absorbing cotton 5 abuts against the flange edge at the air outlet of the volute casing. Thus, the two ends of the sound-absorbing cotton 5 are blocked, which also helps to reduce or avoid the running out of cotton and prevents or reduces the entry of grease into the sound-absorbing cotton 5.

[0050] It should be noted that in the prior art, generally, the edge cut is sealed by a hot-melt technology to prevent the running out of cotton. However, a non-woven fabric is provided on the surface of the two-component sound-absorbing cotton. Using the hot-melt technology to seal the edge cut is likely to cause the non-woven fabric to become flammable and unable to pass the needle flame test, posing a safety hazard; while adopting the solution of the present application, the first edge wrapping member 11 wraps and shields the first side edge 13 of the sound-absorbing cotton 5 (i.e., the edge cut at the first side edge 13 is blocked by the first edge wrapping member 11), and the second edge wrapping member 12 wraps and shields the second side edge 14 of the sound-absorbing cotton 5 (i.e., the edge cut at the second side edge 14 is blocked by the second edge wrapping member 12), and there is no need to use the hot-melt technology to seal the edge cut.

[0051] The first edge wrapping member 11 is provided with screw holes 17 adapted to fix it to the volute casing. The first edge wrapping member 11 is provided with a first elastic piece 21, which is set to be adapted to press against the first side wall 1. Specifically, there are two screw holes 17 in the first edge wrapping member 11, which are respectively located at both ends, as Figure 1As shown. The two screw holes 17 of the first edge wrapping member 11 are both abutted against the flange edge at the air outlet of the volute, and corresponding installation through holes are also provided on this flange edge. Thus, it is convenient to fix the two ends of the first edge wrapping member 11 to the flange edge at the air outlet of the volute by screws respectively. The first edge wrapping member 11 is provided with four first elastic pieces 21, and the four first elastic pieces 21 are arranged in sequence along the extending direction of the first edge wrapping member 11. When the first edge wrapping member 11 wraps the connecting edge angle between the first side wall 1 and the annular wall 3, the two ends of the first edge wrapping member 11 are respectively fixed to the flange edge at the air outlet of the volute by screws. One side edge of the first edge wrapping member 11 abuts against the first side wall 1, and the other side edge of the first edge wrapping member 11 abuts against the annular wall 3. At this time, the four first elastic pieces 21 all press against the first side wall 1. Thus, the fixing of the first edge wrapping member 11 is completed. At this time, the first edge wrapping member 11 presses and fixes the sound-absorbing cotton 5 to the outer surface of the annular wall 3.

[0052] The second edge wrapping member 12 is provided with screw holes 17 suitable for fixing it to the volute. The second edge wrapping member 12 is provided with second elastic pieces 22, which are arranged to be suitable for pressing against the second side wall 2. Specifically, there are two screw holes 17 of the second edge wrapping member 12, which are respectively located at the two ends, as Figure 1 As shown. The two screw holes 17 of the second edge wrapping member 12 are both abutted against the flange edge at the air outlet of the volute, and corresponding installation through holes are also provided on this flange edge. Thus, it is convenient to fix the two ends of the second edge wrapping member 12 to the flange edge at the air outlet of the volute by screws respectively. The second edge wrapping member 12 is provided with four second elastic pieces 22, and the four second elastic pieces 22 are arranged in sequence along the extending direction of the second edge wrapping member 12. When the second edge wrapping member 12 wraps the connecting edge angle between the second side wall 2 and the annular wall 3, the two ends of the second edge wrapping member 12 are respectively fixed to the flange edge at the air outlet of the volute by screws. One side edge of the second edge wrapping member 12 abuts against the second side wall 2, and the other side edge of the second edge wrapping member 12 abuts against the annular wall 3. At this time, the four second elastic pieces 22 all press against the second side wall 2. Thus, the fixing of the second edge wrapping member 12 is completed. At this time, the second edge wrapping member 12 presses and fixes the sound-absorbing cotton 5 to the outer surface of the annular wall 3.

[0053] The electric heating film 4 is attached to the bottom area of the outer surface of the annular wall 3, as Figure 1 shown. The electric heating film 4 is suitable for heating the annular wall 3, so that the grease in the volute is liquefied and discharged. Thus, self-cleaning of the centrifugal fan is realized. The heat insulation cover 7 is in the shape of an arched groove with an upward opening. The heat insulation cover 7 covers outside the electric heating film 4. The electric heating film 4 and the sound-absorbing cotton 5 are spaced apart by the heat insulation cover 7. Thus, the electric heating film 4 and the sound-absorbing cotton 5 do not directly contact.

[0054] The electric heating film 4, the heat insulation cover 7 and the sound-absorbing cotton 5 are arranged in sequence from the inside to the outside, as Figure 1As shown. The annular wall 3 is provided with an oil leakage hole 18. The heat shield 7 is provided with an oil passing hole. The sound-absorbing cotton 5 is provided with an oil guiding through hole 19. The oil leakage hole 18, the oil passing hole and the oil guiding through hole 19 are arranged in sequence from top to bottom. First, the electric heating film 4 is adhered and fixed to the outer surface of the annular wall 3 with adhesive, then the heat shield 7 is fixed to the outer surface of the annular wall 3 with screws, and then the sound-absorbing cotton 5 is fixed to the outer surface of the annular wall 3 with fixing parts. At this time, the oil leakage hole 18, the oil passing hole and the oil guiding through hole 19 coincide to form an oil passage for the grease in the volute to flow out.

[0055] When the fixing parts squeeze and fix the sound-absorbing cotton 5 to the outer surface of the annular wall 3, the annular wall 3 is completely covered and blocked by the sound-absorbing cotton 5. Thus, it helps to improve the sound absorption and noise reduction effect of the sound-absorbing cotton 5. The electric heating film 4 and the heat shield 7 are located between the annular wall 3 and the sound-absorbing cotton 5, and both are completely covered and blocked by the sound-absorbing cotton 5 and are not visible.

[0056] The cable for supplying power to the motor 8 and the cable for supplying power to the electric heating film 4 are integrated to form a power supply line 6, as Figure 1 shown. The power supply line 6 is electrically connected to the power supply module. The power supply module realizes the control of the opening and closing and gear shifting of the motor 8 through corresponding power supply control. The power supply module realizes the control of the opening and closing and gear shifting of the electric heating film 4 through corresponding power supply control.

[0057] Exemplarily, the present application also proposes another embodiment of a centrifugal fan for exhausting oil fume, as Figure 2 and 3 shown. The screw holes 17 of the first edge wrapping part 11 are arranged in the middle, and the screw holes 17 of the second edge wrapping part 12 are also arranged in the middle. It should be noted that, Figure 3 shown in the centrifugal fan, the sound-absorbing cotton 5 has not been installed yet. The screw holes 17 of the first edge wrapping part 11 are adjacent to the first side wall 1, and the first side wall 1 is also provided with corresponding installation through holes. Thus, it is convenient to fix the first edge wrapping part 11 to the first side wall 1 with screws, as Figure 3As shown in the figure. The screw holes 17 of the second edge wrapping member 12 are abutted against the second side wall 2, and the second side wall 2 is also provided with corresponding mounting through holes. Thus, it is convenient to fix the second edge wrapping member 12 to the second side wall 2 by screws. The first edge wrapping member 11 is provided with a first buckle, which is configured to be suitable for clamping the corresponding connecting edge. Specifically, the first buckle includes a first elastic piece integrally formed on the first edge wrapping member 11. A gap is formed between the first elastic piece and the wall body of the first edge wrapping member 11. The corresponding connecting edge is suitable for squeezing the first elastic piece to cause a certain elastic deformation and squeezing into the gap formed between the first elastic piece and the wall body of the first edge wrapping member 11. Thus, when the first edge wrapping member 11 wraps the connecting edge of the first side wall 1 and the annular wall 3, the first buckle clamps the corresponding connecting edge. Thus, the fixing of the first edge wrapping member 11 is completed, and the fixing is reliable. At this time, the first edge wrapping member 11 squeezes and fixes the sound-absorbing cotton 5 to the outer surface of the annular wall 3. Applying a certain external force can cause the corresponding connecting edge to disengage from the gap formed between the first elastic piece and the wall body of the first edge wrapping member 11, and the first elastic piece returns to its original state. The second edge wrapping member 12 is provided with a second buckle 23, which is configured to be suitable for clamping the corresponding connecting edge. Specifically, the second buckle 23 includes a second elastic piece integrally formed on the second edge wrapping member 12. A gap is formed between the second elastic piece and the wall body of the second edge wrapping member 12. The corresponding connecting edge is suitable for squeezing the second elastic piece to cause a certain elastic deformation and squeezing into the gap formed between the second elastic piece and the wall body of the second edge wrapping member 12. Thus, when the second edge wrapping member 12 wraps the connecting edge of the second side wall 2 and the annular wall 3, the second buckle 23 clamps the corresponding connecting edge. Thus, the fixing of the second edge wrapping member 12 is completed, and the fixing is reliable. At this time, the second edge wrapping member 12 squeezes and fixes the sound-absorbing cotton 5 to the outer surface of the annular wall 3. Applying a certain external force can cause the corresponding connecting edge to disengage from the gap formed between the second elastic piece and the wall body of the second edge wrapping member 12, and the second elastic piece returns to its original state. This embodiment focuses on the differences from the above embodiment. For the same or similar parts of this embodiment, refer to the above embodiment.

[0058] Exemplarily, the present application also proposes another embodiment of a centrifugal fan for exhausting oil fume. One end of the sound-absorbing cotton 5 abuts against the flange edge at the air outlet of the volute, and the other end of the sound-absorbing cotton 5 also abuts against the flange edge at the air outlet of the volute. The two ends of the sound-absorbing cotton 5 are spaced apart by the air outlet of the volute. Thus, the two ends of the sound-absorbing cotton 5 are blocked, which helps to reduce or avoid cotton leakage. This embodiment focuses on the differences from the above embodiment. For the same or similar parts of this embodiment, refer to the above embodiment.

[0059] Embodiment 2

[0060] The present application proposes an embodiment of a centrifugal fan for exhausting oil fume, including a volute, a motor 8, an impeller 9, a sound-absorbing cotton 5 and a fixing member, asFigure 5 As shown. The volute includes a first side wall 1, a second side wall 2 and an annular wall 3, and the annular wall 3 is connected and arranged between the first side wall 1 and the second side wall 2. A fixing member is arranged to be suitable for pressing and fixing the sound-absorbing cotton 5 on the outer surface of the annular wall 3. The fixing member is arranged to be detachably fixed to the volute. When the fixing member is fixed to the volute, the fixing member presses and fixes the sound-absorbing cotton 5 on the outer surface of the annular wall 3.

[0061] The fixing member includes a baffle 15 suitable for pressing on the outer surface of the sound-absorbing cotton 5, as Figure 4 shown. One end of the baffle 15 is detachably fixed at the connecting edge corner of the first side wall 1 and the annular wall 3, and the other end is detachably fixed at the connecting edge corner of the second side wall 2 and the annular wall 3.

[0062] One end of the baffle 15 is fixed by a snap structure, and the other end is fixed by a snap structure. Specifically, one end of the baffle 15 is provided with a clamping head, and the other end is also provided with a clamping head. The baffle 15 is U-shaped, as Figure 4 shown. The baffle 15 is integrally injection-molded from plastic or integrally stamped from a metal plate. A clamping seat 24 is arranged at the connecting edge corner of the first side wall 1 and the annular wall 3, and a clamping seat 24 is also arranged at the connecting edge corner of the second side wall 2 and the annular wall 3, as Figure 5 shown.

[0063] The two clamping heads correspond to the two clamping seats 24 one by one. Applying a certain pressing force, the clamping head is snapped into the corresponding clamping seat 24 and they are fixed together, as Figure 5 shown. At this time, the baffle 15 presses and fixes the sound-absorbing cotton 5 on the outer surface of the annular wall 3. When disassembling, applying a certain pulling force, the clamping head can be disengaged from the corresponding clamping seat 24, so that the baffle 15 is disassembled from the volute.

[0064] Exemplarily, the present application also proposes another embodiment of a centrifugal fan for exhausting oil fume, such as Figure 6 、 7 and 8 shown. One end of the baffle 15 is fixed by a snap structure, and the other end is fixed by an insertion hole 25 structure. Specifically, one end of the baffle 15 is provided with a clamping head, and the other end is provided with an insertion piece 26. The baffle 15 is L-shaped, as Figure 6 shown. A clamping seat 24 is arranged at the connecting edge corner of the first side wall 1 and the annular wall 3, and an insertion hole 25 is arranged at the connecting edge corner of the second side wall 2 and the annular wall 3, as Figure 7 shown. First, the sound-absorbing cotton 5 is abutted against the outer surface of the annular wall 3, and then the fixing member is fixed to the volute. When fixing the fixing member to the volute, first insert the insertion piece 26 of the baffle 15 into the insertion hole 25 arranged at the connecting edge corner of the second side wall 2 and the annular wall 3, and then snap the clamping head of the baffle 15 into the clamping seat 24 arranged at the connecting edge corner of the first side wall 1 and the annular wall 3, and the fixing member is fixed on the volute, as Figure 8As shown, at this time, the baffle 15 squeezes and fixes the sound-absorbing cotton 5 on the outer surface of the annular wall 3. When disassembling, apply a certain pulling force, and the chuck can be detached from the card seat 24, and then the insertion piece 26 is taken out from the jack 25, and the baffle 15 can be disassembled from the volute. The number of baffles 15 is four. Each baffle 15 is arranged at intervals in sequence along the extending direction of the sound-absorbing cotton 5. In addition, this centrifugal fan embodiment includes a fixing bracket 10 for installing and fixing the centrifugal fan. The fixing bracket 10 is integrally formed with a fixing pressing piece 20. The fixing pressing piece 20 is arranged to be suitable for squeezing on the outer surface of the sound-absorbing cotton 5, as Figure 8 shown. This embodiment focuses on the differences from the above embodiment. For the same or similar parts of this embodiment, refer to the above embodiment.

[0065] Exemplarily, the present application also proposes another embodiment of a centrifugal fan for exhausting cooking fumes, as Figures 9 to 12 shown, for the baffle 15, one end is fixed by screws or rivets, and the other end is fixed by the jack 25 structure. Specifically, the baffle 15 is integrally formed by stamping a metal plate. One end of the baffle 15 is provided with a connecting piece, and the other end is provided with a jack 25. An insertion piece 26 is provided at the connecting edge of the second side wall 2 and the annular wall 3. The connecting piece is provided with a mounting hole. When fixing the fixing piece to the volute, first insert the insertion piece 26 provided at the connecting edge of the second side wall 2 and the annular wall 3 into the jack 25 of the baffle 15, then place the connecting piece against the first side wall 1, and fix the connecting piece to the first side wall 1 with screws or rivets passing through the mounting hole of the connecting piece, and the fixing piece is fixed on the volute, as Figure 12 shown. At this time, the baffle 15 squeezes and fixes the sound-absorbing cotton 5 on the outer surface of the annular wall 3. It should be noted that the baffle 15 is provided with fins 16. The end of the fin 16 is arranged to be suitable for passing through the sound-absorbing cotton 5 along the Figure 9 indicated line shown and then bending to abut against the inner surface of the sound-absorbing cotton 5. The sound-absorbing cotton 5 is pre-provided with corresponding through holes for the end of the fin 16 to pass through. Each baffle 15 is provided with two fins 16, as Figure 9 shown. This embodiment focuses on the differences from the above embodiment. For the same or similar parts of this embodiment, refer to the above embodiment.

[0066] Exemplarily, the present application also proposes another embodiment of a centrifugal fan for exhausting cooking fumes. For the baffle 15, one end is fixed by screws or rivets, and the other end is fixed by screws or rivets. This embodiment focuses on the differences from the above embodiment. For the same or similar parts of this embodiment, refer to the above embodiment.

[0067] Embodiment 3

[0068] The present application also provides an embodiment of a range hood, which includes a housing, a smoke collecting hood, and the above-described centrifugal fan embodiment. The smoke collecting hood is suspended below the housing. The centrifugal fan is disposed inside the housing. The fixing bracket 10 of the volute of the centrifugal fan is fixed to the wall of the housing. When the centrifugal fan operates, a negative pressure is generated to form a fume airflow. The smoke collecting hood gathers the fume airflow and guides it into the housing. Then, the fume airflow flows through the centrifugal fan and out of the housing, and then into the exhaust pipe, and then into the common flue.

[0069] Embodiment 4

[0070] The present application also provides another embodiment of a range hood, which includes a housing, a smoke collecting hood, and the above-described centrifugal fan embodiment. The smoke collecting hood is suspended below the housing. The centrifugal fan is disposed outside the housing. The centrifugal fan is disposed above the ceiling and above the housing. An air flow duct is connected between the centrifugal fan and the housing. When the centrifugal fan operates, a negative pressure is generated to form a fume airflow. The smoke collecting hood gathers the fume airflow and guides it into the housing. Then, the fume airflow flows out of the housing and into the air flow duct, and then through the centrifugal fan, and then into the exhaust pipe, and then into the common flue.

[0071] Although the specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure of the present application, even when describing a single embodiment with respect to specific features. The feature examples provided in the disclosure of the present application are for illustrative purposes only and not for limitation, unless otherwise expressly stated. In specific implementations, multiple features may be combined with each other according to actual needs and when technically feasible. Various substitutions, changes, and modifications can also be conceived without departing from the spirit and scope of the present application.

Claims

1. A centrifugal fan for exhausting cooking fumes, comprising a volute, a motor (8) and an impeller (9), wherein the volute includes a first side wall (1), a second side wall (2) and an annular wall (3), and the annular wall (3) is connected between the first side wall (1) and the second side wall (2), and is characterized in that: it includes a sound-absorbing cotton (5) and a fixing member; the fixing member is configured to be detachably fixed to the volute; when the fixing member is fixed to the volute, the fixing member presses and fixes the sound-absorbing cotton (5) to the outer surface of the annular wall (3).

2. The centrifugal fan according to claim 1, wherein: the fixing member includes a first edge wrapping member (11) and a second edge wrapping member (12); the first edge wrapping member (11) wraps around the connecting edge between the first side wall (1) and the annular wall (3) and wraps and covers the first side edge (13) of the sound-absorbing cotton (5); the second edge wrapping member (12) wraps around the connecting edge between the second side wall (2) and the annular wall (3) and wraps and covers the second side edge (14) of the sound-absorbing cotton (5).

3. The centrifugal fan according to claim 2, wherein: the first edge wrapping member (11) is provided with screw holes (17) suitable for fixing it to the volute; and / or the second edge wrapping member (12) is provided with screw holes (17) suitable for fixing it to the volute; and / or the first edge wrapping member (11) is provided with a first buckle, which is configured to be suitable for clamping on the corresponding connecting edge; and / or the second edge wrapping member (12) is provided with a second buckle (23), which is configured to be suitable for clamping on the corresponding connecting edge; and / or the first edge wrapping member (11) is provided with a first elastic sheet (21), which is configured to be suitable for pressing against the first side wall (1); and / or the second edge wrapping member (12) is provided with a second elastic sheet (22), which is configured to be suitable for pressing against the second side wall (2).

4. The centrifugal fan according to claim 1, wherein: the fixing member includes a baffle (15) suitable for pressing against the outer surface of the sound-absorbing cotton (5); one end of the baffle (15) is detachably fixed at the connecting edge between the first side wall (1) and the annular wall (3), and the other end is detachably fixed at the connecting edge between the second side wall (2) and the annular wall (3).

5. The centrifugal fan according to claim 4, wherein: the baffle (15) is provided with fins (16); the ends of the fins (16) are configured to be suitable for passing through the sound-absorbing cotton (5) and then being bent to abut against the inner surface of the sound-absorbing cotton (5).

6. The centrifugal fan according to claim 4, wherein: one end of the baffle (15) is fixed by a buckle structure, and the other end is fixed by a buckle structure; or one end of the baffle (15) is fixed by a buckle structure, and the other end is fixed by an insertion hole (25) structure; or one end of the baffle (15) is fixed by a screw or rivet, and the other end is fixed by an insertion hole (25) structure; or The baffle (15) has one end fixed by screws or rivets and the other end fixed by screws or rivets.

7. The centrifugal fan according to claim 4, characterized in that: The number of the baffles (15) is at least two; Each of the baffles (15) is arranged at intervals in sequence along the extension direction of the sound-absorbing cotton (5).

8. The centrifugal fan according to claim 1, characterized in that: It includes a fixing bracket (10) for installing and fixing the centrifugal fan; The fixing bracket (10) is integrally formed with a fixing pressing piece (20) which is arranged to be suitable for pressing on the outer surface of the sound-absorbing cotton (5).

9. The centrifugal fan according to claim 1, characterized in that: The annular wall (3) is completely covered and blocked by the sound-absorbing cotton (5).

10. The centrifugal fan according to claim 1, characterized in that: The annular wall (3) is provided with an oil leakage hole (18); The sound-absorbing cotton (5) is provided with an oil guiding through hole (19); The oil leakage hole (18) and the oil guiding through hole (19) are arranged in sequence from top to bottom.

11. An oil fume extractor, characterized in that: It includes the centrifugal fan according to any one of claims 1 to 10.

Images