Range hood and centrifugal fan for extracting cooking fumes

Abstract

The application provides an improved range hood and a centrifugal fan for discharging oil fume. The centrifugal fan for discharging oil fume comprises a volute, a motor and an impeller. The volute comprises a first side wall, a second side wall and a ring wall. The ring wall is connected between the first side wall and the second side wall and comprises sound-absorbing cotton which is arranged on the outer surface of the ring wall. The ring wall is provided with a first fixing member at the end away from the volute tongue. The first fixing member is spaced apart from the ring wall to form a first gap. When the sound-absorbing cotton is fixed on the outer surface of the ring wall, one end of the sound-absorbing cotton is arranged in the first gap. The first fixing member is arranged to be deformed to press and fix the sound-absorbing cotton arranged in the first gap. The technical scheme can improve the assembly efficiency of the sound-absorbing cotton.

Description

[Technical Field]

[0001] This application relates to the field of range hoods, and more particularly to centrifugal fans used for extracting and exhausting cooking fumes. [Background Technology]

[0002] In Asia, the traditional cooking method of stir-frying results in fumes with a particularly high oil content. Therefore, range hoods, used to extract cooking fumes, have become an essential household appliance. As people's demands for quality of life continue to rise, range hoods are constantly being upgraded and improved.

[0003] Currently, to reduce noise and improve user experience, solutions for installing sound-absorbing cotton in range hoods have been proposed. For example, sound-absorbing cotton can be placed in the centrifugal fan of the range hood to reduce the noise generated by the fan. However, existing solutions typically involve adhesively fixing the sound-absorbing cotton to the centrifugal fan, which is inconvenient for disassembly and replacement. Moreover, using adhesive to attach the sound-absorbing cotton makes it difficult to pass the needle flame test, posing certain safety hazards.

[0004] Unless there is sufficient evidence to support it, the prior art described herein does not imply an admission that such prior art was known to a person skilled in the art prior to the filing date of this application. [Summary of the Invention]

[0005] One objective of this application is to provide an improved range hood and a centrifugal fan for extracting and exhausting oil fumes, addressing at least one of the above-mentioned technical problems and / or other possible technical problems not mentioned in this application.

[0006] According to a first aspect of this application, embodiments of this application provide a centrifugal fan for extracting oil fumes, including a volute, a motor, and an impeller. The volute includes a first sidewall, a second sidewall, and an annular wall. The annular wall is connected between the first and second sidewalls and includes sound-absorbing cotton, configured to cover and fix it to the outer surface of the annular wall. A first fixing member is provided at the end of the annular wall away from the volute tongue. A first gap is formed between the first fixing member and the annular wall. When the sound-absorbing cotton is covered and fixed to the outer surface of the annular wall, one end of the sound-absorbing cotton is inserted into the first gap. The first fixing member is configured to deform and compress and fix the sound-absorbing cotton inserted into the first gap. Using the technical solution of this application helps to improve the assembly efficiency of the sound-absorbing cotton.

[0007] In one or more embodiments, the first fixing member is provided with a pressing claw; the pressing claw is configured to bend and press against the sound-absorbing cotton placed within the first gap. Thus, the first fixing member has a simple structure, low cost, and high assembly efficiency of the sound-absorbing cotton.

[0008] In one or more embodiments, the first fixing member is generally U-shaped; the first fixing member includes a first ear, a second ear, and a connecting plate; the connecting plate is connected between the first ear and the second ear; the first ear is fixed to the first sidewall, and the second ear is fixed to the second sidewall; the pressing claw is formed by cutting the connecting plate. Therefore, the first fixing member has a simple structure, low cost, and high assembly efficiency for the sound-absorbing cotton.

[0009] In one or more embodiments, the number of the extrusion claws is at least two; at least one extrusion claw has its free end located at the upper edge of the connecting plate; at least one extrusion claw has its free end located at the lower edge of the connecting plate.

[0010] In one or more embodiments, the extrusion claw is provided with a perforation, notch, or half-slit structure at its bending point to facilitate bending; and / or

[0011] The free end of the extrusion claw is tilted away from the first gap to form a V-shaped extrusion section.

[0012] In one or more embodiments, the first fixing member includes an elastic element; the first fixing member is configured to undergo elastic deformation to compress and fix the sound-absorbing cotton placed within the first gap. Thus, the first fixing member has a simple structure, low cost, and high assembly efficiency for the sound-absorbing cotton.

[0013] In one or more embodiments, a second fixing member is provided at one end of the annular wall near the volute tongue; a second gap is formed between the second fixing member and the annular wall; when the sound-absorbing cotton is wrapped and fixed to the outer surface of the annular wall, one end of the sound-absorbing cotton is placed within the second gap; the second fixing member is configured to deform and compress and fix the sound-absorbing cotton placed within the second gap. This helps to improve the assembly efficiency of the sound-absorbing cotton.

[0014] In one or more embodiments, the second fixing member includes an integrally formed base plate and an extrusion plate; the base plate is fixed to the annular wall and located above the volute tongue; the extrusion plate is configured to be bent to extrude and fix the sound-absorbing cotton placed within the second gap. Thus, the second fixing member has a simple structure, low cost, and high assembly efficiency for the sound-absorbing cotton.

[0015] In one or more embodiments, the extrusion plate is provided with perforations, notches, or half-slit structures at its bending points to facilitate bending; and / or

[0016] The free end of the extrusion plate curves upward toward the direction away from the second gap to form a V-shaped pressing portion; and / or

[0017] The bend in the extrusion plate is located at the junction of the extrusion plate and the substrate.

[0018] In one or more embodiments, an oil guide cover is included, configured to be suspended from the bottom of the centrifugal fan and covering the outside of the sound-absorbing cotton; the volute is provided with a first oil leakage hole, the sound-absorbing cotton is provided with a second oil leakage hole, and the oil guide cover is provided with a third oil leakage hole; the first, second, and third oil leakage holes are stacked from top to bottom, allowing grease inside the volute to flow through and be discharged sequentially; both ends of the oil guide cover have oil leakage outlets spaced apart from the sound-absorbing cotton. The oil guide cover helps to improve the grease collection effect.

[0019] According to a second aspect of this application, embodiments of this application provide a range hood, including a centrifugal fan as described in any of the preceding claims. The technical solution of this application helps to improve the assembly efficiency of sound-absorbing cotton.

[0020] It should be noted that, unless otherwise specified, the directional expressions such as "above", "below", "from top to bottom", "upper side", "lower side", and "bottom" appearing in this application are based on the usual usage state of the range hood.

[0021] It should be noted that the terms "first," "second," and "third" appearing in this specification are for descriptive purposes only and are not used to indicate relative importance; moreover, they do not define the number of features they define; furthermore, they do not define the logical or sequential relationship between the features they define.

[0022] The above description of the invention is not intended to depict all possible implementations of the invention. Throughout the application, numerous examples are provided to provide guidance, and these examples can be used in a variety of feasible combinations. [Attached Image Description]

[0023] The following figures are for illustrative purposes only and do not limit the scope of this application, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a centrifugal fan embodiment for extracting oil fumes without the sound-absorbing cotton and oil guide cover assembled;

[0025] Figure 2 This is a schematic diagram of the structure of a centrifugal fan embodiment for extracting oil fumes without the oil guide cover assembled;

[0026] Figure 3 This is a schematic diagram of the structure of an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0027] Figure 4This is a schematic diagram of the structure of a centrifugal fan embodiment for extracting oil fumes without the sound-absorbing cotton and oil guide cover assembled;

[0028] Figure 5 This is a schematic diagram of the structure of a centrifugal fan embodiment for extracting oil fumes without the oil guide cover assembled;

[0029] Figure 6 This is a schematic diagram of the structure of an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0030] Figure 7 This is a schematic diagram of the structure of the first fixing member of an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0031] Figure 8 yes Figure 7 A schematic diagram of the structure of the first fastener after deformation is shown.

[0032] Figure 9 yes Figure 8 A schematic diagram of the first fastener shown from another perspective;

[0033] Figure 10 This is a schematic diagram of the structure of the second fixing component of an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0034] Figure 11 yes Figure 10 The diagram shows the structure of the second fastener after deformation.

[0035] Figure label:

[0036] 1-First sidewall, 2-Second sidewall, 3-Annular wall, 4-First ear, 5-Second ear, 6-Connecting plate, 7-Extrusion claw, 8-V-shaped extrusion part, 9-Sound-absorbing cotton, 10-Oil guide cover, 11-First oil drain, 12-Second oil drain, 13-Base plate, 14-Extrusion plate, 15-V-shaped pressing part, 16-Motor, 17-Impeller.

Detailed Implementation Methods

[0037] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this application clearer, the following will provide a more detailed description of this application in conjunction with the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit the scope of protection of this application. Various embodiments may share the same view or multiple views for description, but not all features appearing in the same view should be interpreted as features that an embodiment must possess. Instead, they can be combined in any suitable manner as long as they are not technically mutually exclusive. Moreover, for the sake of brevity, different embodiments of different aspects may be presented in the same specific design; however, such presentation does not mean that embodiments of these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also take into account the description in the specification and what a person skilled in the art can directly and unambiguously determine based on the description in the specification.

[0038] This application proposes an embodiment of a centrifugal fan for extracting and exhausting oil fumes, including a volute, sound-absorbing cotton 9, an oil guide shroud 10, a motor 16, and an impeller 17, as follows: Figures 1 to 6 As shown. The motor 16 and impeller 17 are housed within the volute. The motor 16 is configured to drive the impeller 17 to rotate, thereby generating negative pressure to extract oil fumes.

[0039] The volute includes a first sidewall 1, a second sidewall 2, and an annular wall 3. The annular wall 3 is connected between the first sidewall 1 and the second sidewall 2. Sound-absorbing cotton 9 is configured to cover and be fixed to the outer surface of the annular wall 3, such as... Figure 2 , 3 As shown in Figures 5 and 6, the tops of the first sidewall 1, the second sidewall 2, and the annular wall 3 together form the air outlet of the volute. The air inlet of the volute is provided on the first sidewall 1. The motor 16 is fixed to the second sidewall 2.

[0040] Sound-absorbing cotton 9, also known as sound-insulating cotton, is used to absorb and reduce the noise generated by the centrifugal fan. The sound-absorbing cotton 9 is wrapped and fixed to the outer surface of the ring wall 3, forming a surrounding effect on the "motor 16 and impeller 17", which are the main noise sources. As a result, the noise reduction effect is good.

[0041] The annular wall 3 has a first fixing member at the end furthest from the volute tongue, such as... Figures 1 to 3 As shown, a first gap is formed between the first fixing member and the ring wall 3. When the sound-absorbing cotton 9 is wrapped and fixed to the outer surface of the ring wall 3, one end of the sound-absorbing cotton 9 is inserted into the first gap. The first fixing member is configured to deform and compress the sound-absorbing cotton 9 inserted into the first gap; thereby, the sound-absorbing cotton 9 inserted into the first gap is fixed. This helps to improve the assembly efficiency of the sound-absorbing cotton 9, and also facilitates the disassembly and replacement of the sound-absorbing cotton 9.

[0042] The first fixing component is U-shaped overall. The first fixing component includes a first ear 4, a second ear 5, and a connecting plate 6, as shown below. Figures 1 to 3 As shown. A connecting plate 6 is connected and disposed between the first ear portion 4 and the second ear portion 5. The first fixing member is made of a metal plate by stamping. The first ear portion 4 and the second ear portion 5 are formed by bending the two ends of the metal plate. The first ear portion 4 and the second ear portion 5 are disposed facing each other.

[0043] The first ear 4 is fixed to the first side wall 1, and the second ear 5 is fixed to the second side wall 2, as follows: Figures 1 to 3 As shown. When the first ear 4 is fixed to the first side wall 1 and the second ear 5 is fixed to the second side wall 2, the connecting plate 6 is located outside the ring wall 3, and a first gap is formed between the connecting plate 6 and the ring wall 3.

[0044] The first fixing member is provided with a pressing claw 7. The pressing claw 7 is configured to bend and press against the sound-absorbing cotton 9 inserted into the first gap. The pressing claw 7 is integrally formed into the connecting plate 6. Specifically, the pressing claw 7 is formed by cutting the connecting plate 6, as shown below. Figure 7 , 8 As shown in Figure 9, the first fastener is made by stamping a metal sheet, and the extrusion claw 7 is integrally formed onto the metal sheet. Preferably, the metal sheet is stainless steel.

[0045] The number of extrusion claws 7 is four. Two of the extrusion claws 7 are located on the upper side, with their free ends positioned along the upper edge of the connecting plate 6; the other two extrusion claws 7 are located on the lower side, with their free ends positioned along the lower edge of the connecting plate 6, as shown below. Figures 1 to 3 As shown. The two upper pressing claws 7 are located at the left and right ends of the connecting plate 6, respectively. The two lower pressing claws 7 are located in the middle of the connecting plate 6, and are spaced a certain distance apart. The two lower pressing claws 7 are positioned between the two upper pressing claws 7.

[0046] The extrusion claw 7 has perforations and notches at its bending point to facilitate bending. Specifically, there is a notch at each of the left and right ends of the bending point of the extrusion claw 7, and two perforations are provided between these two notches, such as... Figure 7 and 8 As shown, the two perforated holes are arranged sequentially along the extension direction of the bend of the extrusion claw 7 and are spaced a certain distance apart.

[0047] When the squeezing claw 7 bends and squeezes the sound-absorbing cotton 9 that is fixed inside the first gap, the free end of the squeezing claw 7 extends into the inner side of the connecting plate 6, as shown. Figure 8 and 9As shown. At this time, the free ends of the two upper squeezing claws 7 bend downward and insert into the first gap, and the free ends of the two lower squeezing claws 7 bend upward and insert into the first gap. The two upper squeezing claws 7 and the two lower squeezing claws 7 form a clamping force, thereby squeezing and fixing the sound-absorbing cotton 9 placed in the first gap under the action of the clamping force, and the fixing effect is good.

[0048] The free end of the extrusion claw 7 curves upwards in a direction away from the first gap to form a V-shaped extrusion section 8, such as... Figure 7 , 8 As shown in Figure 9, when the squeezing claw 7 bends and squeezes the sound-absorbing cotton 9 that is fixed inside the first gap, the V-shaped squeezing part 8 of the squeezing claw 7 squeezes the sound-absorbing cotton 9 that is placed inside the first gap.

[0049] The first ear 4 is fixed to the first side wall 1, such as Figures 1 to 3 As shown. Specifically, the first ear 4 is fixed to the first sidewall 1 by screws, clips, rivets, or welding. The second ear 5 is fixed to the second sidewall 2. Specifically, the second ear 5 is fixed to the second sidewall 2 by screws, clips, rivets, or welding. The arrangement of the first ear 4 and the second ear 5 allows for convenient fixing of the first fastener to the volute.

[0050] The annular wall 3 has a second fixing member at one end near the volute tongue, such as... Figure 4 , 5 As shown in Figure 6, a second gap is formed between the second fixing member and the annular wall 3. When the sound-absorbing cotton 9 is wrapped and fixed to the outer surface of the annular wall 3, one end of the sound-absorbing cotton 9 is inserted into the second gap. The second fixing member is configured to deform and compress the sound-absorbing cotton 9 inserted into the second gap, thereby fixing the sound-absorbing cotton 9 inserted into the second gap. It can be seen that one end of the sound-absorbing cotton 9 is fixed by the first fixing member, and the other end of the sound-absorbing cotton 9 is fixed by the second fixing member, thereby wrapping and fixing the sound-absorbing cotton 9 to the outer surface of the annular wall 3. This helps to improve the assembly efficiency of the sound-absorbing cotton 9, and also facilitates the disassembly and replacement of the sound-absorbing cotton 9.

[0051] The second fastener includes an integrally formed base plate 13 and an extrusion plate 14, such as Figure 10 and 11 As shown. The substrate 13 is fixed to the annular wall 3 and located above the volute tongue. Specifically, the substrate 13 is fixed to the annular wall 3 by screws, clips, rivets, or welding. The extrusion plate 14 is configured to be bent to extrude and fix the sound-absorbing cotton 9 placed within the second gap.

[0052] The extrusion plate 14 has perforations at its bending points to facilitate bending, such as... Figure 10 and 11 As shown. The bend in the extrusion plate 14 is located at the junction of the extrusion plate 14 and the substrate 13.

[0053] The free end of the extrusion plate 14 curves upwards in a direction away from the second gap to form a V-shaped pressing part 15, such as Figure 10 and 11 As shown. When the second fixing member presses and fixes the sound-absorbing cotton 9 placed in the second gap, the V-shaped pressing part 15 presses against the sound-absorbing cotton 9 placed in the second gap.

[0054] The oil guide cover 10 is designed to be suspended from the bottom of the centrifugal fan and cover the outside of the sound-absorbing cotton 9, such as... Figure 3 and 6 As shown. The volute is provided with a first oil leakage hole, the sound-absorbing cotton 9 is provided with a second oil leakage hole, and the oil guide cover 10 is provided with a third oil leakage hole. The first, second, and third oil leakage holes are stacked from top to bottom to allow the grease inside the volute to flow through and be discharged sequentially.

[0055] Both ends of the oil guide cover 10 have oil leakage ports spaced apart from the sound-absorbing cotton 9. Specifically, one end of the oil guide cover 10 has a first oil leakage port 11 spaced apart from the sound-absorbing cotton 9, and the other end of the oil guide cover 10 has a second oil leakage port 12 spaced apart from the sound-absorbing cotton 9. Figure 3 and 6 As shown. Grease on the outer surface of some of the sound-absorbing cotton 9 flows downwards into the first oil drain 11; grease on the outer surface of some of the sound-absorbing cotton 9 flows downwards into the second oil drain 12; this grease flowing into the first oil drain 11 and the second oil drain 12 will eventually be discharged from the third oil drain hole of the oil guide cover 10. It should be noted that, since the oil guide cover 10 is suspended from the bottom of the centrifugal fan and covers the outside of the sound-absorbing cotton 9, in addition to guiding oil, the oil guide cover 10 also serves to fix the sound-absorbing cotton 9.

[0056] As an example, another embodiment of the centrifugal fan for extracting oil fumes proposed in this application has a semi-shear structure at its bending point on the extrusion claw to facilitate bending. This embodiment focuses on the differences from the above embodiments; the same or similar parts of this embodiment can be referred to the above embodiments.

[0057] Exemplarily, another embodiment of the centrifugal fan for extracting oil fumes proposed in this application includes a first fixing member comprising an elastic member. The first fixing member is configured to undergo elastic deformation to compress and fix the sound-absorbing cotton placed within the first gap. This embodiment focuses on illustrating the differences from the above embodiments; similar or identical parts of this embodiment can be referred to in the above embodiments.

[0058] Exemplarily, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, two extrusion claws are located on the upper side, with their free ends located at the upper edge of the connecting plate; the other two extrusion claws are located on the lower side, with their free ends located at the lower edge of the connecting plate. The two extrusion claws located on the lower side are respectively located at the left and right ends of the connecting plate. The two extrusion claws located on the upper side are located in the middle of the connecting plate, and are spaced apart by a certain distance. The two extrusion claws located on the upper side are situated between the two extrusion claws located on the lower side. This embodiment focuses on illustrating the differences from the above embodiment; similar or identical parts of this embodiment can be referred to in the above embodiment.

[0059] Exemplarily, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, two extrusion claws are located on the upper side, with their free ends located at the upper edge of the connecting plate; the other two extrusion claws are located on the lower side, with their free ends located at the lower edge of the connecting plate. The extrusion claws on the upper side and the extrusion claws on the lower side are arranged alternately, that is, along the extending direction of the connecting plate, the extrusion claws on the upper side are immediately adjacent to the extrusion claws on the lower side, and the extrusion claws on the lower side are immediately adjacent to the extrusion claws on the upper side. This embodiment focuses on illustrating the differences from the above embodiments; the same or similar parts of this embodiment can be referred to in the above embodiments.

[0060] As an example, another embodiment of the centrifugal fan for extracting oil fumes proposed in this application includes an extrusion plate with a notch at its bending point to facilitate bending. This embodiment focuses on illustrating the differences from the above embodiments; similar or identical parts of this embodiment can be referred to in the above embodiments.

[0061] As an example, another embodiment of the centrifugal fan for extracting oil fumes proposed in this application includes an extrusion plate with a semi-shear structure at its bending point to facilitate bending. This embodiment focuses on illustrating the differences from the above embodiments; similar or identical parts of this embodiment can be referred to in the above embodiments.

[0062] This application also proposes an embodiment of a range hood, including a housing, a smoke collection hood, and the centrifugal fan described above. The smoke collection hood is suspended below the housing. The centrifugal fan is disposed inside the housing.

[0063] When the range hood operates to extract cooking fumes from the stove below, the centrifugal fan starts, generating negative pressure and creating an airflow of fumes. This airflow, guided by the fume collection hood, flows into the casing and then into the common flue. At this time, the centrifugal fan generates considerable noise. Sound-absorbing cotton 9 is wrapped and fixed to the outer surface of the ring wall 3, effectively surrounding the centrifugal fan's motor 16 and impeller 17, the main noise source. This results in good noise reduction and improves the user experience.

[0064] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this application, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this application are intended to be illustrative and not limiting, unless explicitly stated otherwise. In practice, multiple features can be combined with each other where technically feasible and according to actual needs. Various substitutions, modifications, and alterations are also conceived without departing from the spirit and scope of this application.

Claims

1. A centrifugal fan for extracting and exhausting oil fumes, comprising a volute, a motor (16), and an impeller (17), wherein the volute comprises a first sidewall (1), a second sidewall (2), and an annular wall (3), the annular wall (3) being connected between the first sidewall (1) and the second sidewall (2), characterized in that: Including sound-absorbing cotton (9), which is configured to cover and fix to the outer surface of the ring wall (3); The annular wall (3) has a first fixing member at the end away from the volute tongue; The first fixing member and the annular wall (3) are spaced apart by a first gap; When the sound-absorbing cotton (9) is wrapped and fixed to the outer surface of the ring wall (3), one end of the sound-absorbing cotton (9) is placed inside the first gap; The first fastener is configured to deform and compress and fix the sound-absorbing cotton (9) placed within the first gap.

2. The centrifugal fan according to claim 1, characterized in that: The first fixing member is provided with a pressing claw (7); The compression claw (7) is configured to bend and compress the sound-absorbing cotton (9) placed within the first gap.

3. The centrifugal fan according to claim 2, characterized in that: The first fastener is U-shaped overall; The first fastener includes a first ear (4), a second ear (5), and a connecting plate (6); The connecting plate (6) is connected and disposed between the first ear (4) and the second ear (5); The first ear (4) is fixed to the first sidewall (1), and the second ear (5) is fixed to the second sidewall (2); The extrusion claw (7) is formed by cutting the connecting plate (6).

4. The centrifugal fan according to claim 3, characterized in that: The number of the extrusion claws (7) is at least two; At least one extrusion claw (7) has its free end located at the upper edge of the connecting plate (6); At least one extrusion claw (7) has its free end located at the lower edge of the connecting plate (6).

5. The centrifugal fan according to claim 2, characterized in that: The extrusion claw (7) has a perforated hole, notch, or half-scissor structure at its bending point to facilitate bending; and / or The free end of the extrusion claw (7) is raised in a direction away from the first gap to form a V-shaped extrusion part (8).

6. The centrifugal fan according to claim 1, characterized in that: The first fastener includes an elastic element; The first fastener is configured to elastically deform and compress and fix the sound-absorbing cotton (9) placed within the first gap.

7. The centrifugal fan according to any one of claims 1 to 6, characterized in that: The annular wall (3) has a second fixing member at one end near the volute tongue; The second fastener and the annular wall (3) are spaced apart by a second gap; When the sound-absorbing cotton (9) is wrapped and fixed to the outer surface of the ring wall (3), one end of the sound-absorbing cotton (9) is placed inside the second gap; The second fastener is configured to deform and compress and fix the sound-absorbing cotton (9) placed within the second gap.

8. The centrifugal fan according to claim 7, characterized in that: The second fastener includes an integrally formed base plate (13) and an extrusion plate (14); The substrate (13) is fixed to the annular wall (3) and located above the volute tongue; The extrusion plate (14) is configured to bend and compress the sound-absorbing cotton (9) placed within the second gap.

9. The centrifugal fan according to claim 8, characterized in that: The extrusion plate (14) has perforations, notches, or half-slit structures at its bending points to facilitate bending; and / or The free end of the extrusion plate (14) is raised in a direction away from the second gap to form a V-shaped pressing part (15); and / or The bend of the extrusion plate (14) is located at the junction of the extrusion plate (14) and the substrate (13).

10. The centrifugal fan according to any one of claims 1 to 6, characterized in that: Includes an oil guide cover (10), which is configured to be suspended at the bottom of the centrifugal fan and cover the outside of the sound-absorbing cotton (9); The volute is provided with a first oil leakage hole, the sound-absorbing cotton (9) is provided with a second oil leakage hole, and the oil guide cover (10) is provided with a third oil leakage hole; The first oil leakage hole, the second oil leakage hole and the third oil leakage hole are stacked from top to bottom, so that the grease in the volute can flow through and be discharged in sequence. Both ends of the oil guide cover (10) are spaced apart from the sound-absorbing cotton (9) to form oil leakage ports.

11. A range hood, characterized in that: Includes the centrifugal fan as described in any one of claims 1 to 10.

Images