Centrifugal fan for extracting fumes and extractor hood

Abstract

The application provides a centrifugal fan and a range hood for extracting oil fume. The centrifugal fan comprises a volute, a motor and an impeller. The volute comprises a first side wall, a second side wall and a ring wall which is connected between the first side wall and the second side wall. The volute further comprises sound-absorbing cotton which is arranged to be wrapped around the outer surface of the ring wall. The ring wall is provided with a first fixing member at one end away from the volute tongue and a second fixing member at the other end close to the volute tongue. The sound-absorbing cotton is provided with a first mounting hole and a second mounting hole which are arranged at a certain distance along the extension direction of the sound-absorbing cotton at the head end of the sound-absorbing cotton, and a third mounting hole and a fourth mounting hole which are arranged at a certain distance along the extension direction of the sound-absorbing cotton at the tail end of the sound-absorbing cotton. The head end of the sound-absorbing cotton is arranged to be selectively fixed to one end of the ring wall away from the volute tongue or the other end of the ring wall close to the volute tongue. Therefore, the assembly efficiency of the sound-absorbing cotton is improved.

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 using 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. Furthermore, using adhesive to attach the sound-absorbing cotton makes it difficult to pass the needle flame test, posing a safety hazard. In addition, existing sound-absorbing cotton is prone to being installed upside down, affecting assembly efficiency. Moreover, existing sound-absorbing cotton either has excessively wide heat-fused edges, failing the needle flame test, or excessively narrow edges, making it prone to leakage. Furthermore, existing sound-absorbing cotton often contains excessive flame retardants to pass the needle flame test, severely compromising its noise reduction effect.

[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 centrifugal fan and range hood for extracting 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 and exhausting 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. The annular wall has a first fixing member at one end away from the volute tongue and a second fixing member at the other end near the volute tongue. The sound-absorbing cotton has a first mounting hole and a second mounting hole spaced at a certain distance along its extension direction at its head end, and a tail end... The sound-absorbing cotton is provided with a third mounting hole and a fourth mounting hole spaced at certain intervals along its extension direction. The head end of the sound-absorbing cotton is configured to be selectively fixed to either the end of the ring wall away from the volute tongue or the end of the ring wall adjacent to the volute tongue. When the head end of the sound-absorbing cotton is fixed to the end of the ring wall away from the volute tongue, the first fixing member passes through the first mounting hole, and the second fixing member passes through the third mounting hole. When the head end of the sound-absorbing cotton is fixed to the end of the ring wall adjacent to the volute tongue, the first fixing member passes through the fourth mounting hole, and the second fixing member passes through the second mounting hole. Using the technical solution of this application, the head end of the sound-absorbing cotton is suitable for selectively fixing to either the end of the ring wall away from the volute tongue or the end of the ring wall adjacent to the volute tongue, which facilitates installation and helps improve the assembly efficiency of the sound-absorbing cotton.

[0007] In one or more embodiments, the first fastener is configured to bend and press against the outer surface of the sound-absorbing cotton after passing through the corresponding mounting hole; the second fastener is configured to bend and press against the outer surface of the sound-absorbing cotton after passing through the corresponding mounting hole. The technical solution of this application is simple and efficient in structure, helping to improve the assembly efficiency of the sound-absorbing cotton.

[0008] In one or more embodiments, the first fastener is provided with a perforated hole, notch, or half-cut structure to facilitate bending; the second fastener is provided with a perforated hole, notch, or half-cut structure to facilitate bending. This facilitates bending and helps improve the assembly efficiency of the sound-absorbing cotton.

[0009] In one or more embodiments, the first fixing member is a sheet-like member, and the free end of the first fixing member is configured to bend toward the air outlet of the volute; and / or

[0010] The second fastener is a sheet-like piece, and the free end of the second fastener is configured to bend toward the volute tongue; and / or

[0011] The first fixing member is an L-shaped sheet member, including a first base plate and a first rocker plate, wherein the first base plate is configured to be fixed to the annular wall; and / or

[0012] The second fixing member is an L-shaped sheet member, including a second base plate and a second rocker plate, wherein the second base plate is configured to be fixed to the annular wall.

[0013] In one or more embodiments, the first fixing member is a U-shaped sheet; the first fixing member includes a first ear, a second ear, and a first connecting portion; the first connecting portion is connected between the first ear and the second ear; the free end of the first ear is configured to bend toward the first sidewall; the free end of the second ear is configured to bend toward the second sidewall. Therefore, installation is convenient and helps improve the assembly efficiency of the sound-absorbing cotton.

[0014] In one or more embodiments, the second fixing member is a U-shaped sheet; the second fixing member includes a third ear, a fourth ear, and a second connecting portion; the second connecting portion is connected between the third ear and the fourth ear; the free end of the third ear is configured to bend toward the first sidewall; the free end of the fourth ear is configured to bend toward the second sidewall. This facilitates installation and helps improve the assembly efficiency of the sound-absorbing cotton.

[0015] 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.

[0016] In one or more embodiments, the sound-absorbing cotton is provided with a heat-fused edge; the width of the heat-fused edge is less than or equal to 2.5 mm.

[0017] In one or more embodiments, the width of the hot-melt edge is equal to 2 mm; or

[0018] The width of the hot-melt edge is greater than or equal to 1.5 mm.

[0019] Therefore, the width of the heat-fused edge is not too small, so that the filling material inside the nonwoven fabric is not easily dispersed; on the other hand, the width of the heat-fused edge is not too large, so that it can pass the needle flame test and meet the safety requirements.

[0020] In one or more embodiments, the sound-absorbing cotton comprises 60-70 wt% PP and 30-40 wt% PET.

[0021] In one or more embodiments, the sound-absorbing cotton contains 3-6 wt% flame retardant. This ensures that the noise reduction effect is not significantly affected, while still meeting safety requirements through needle flame testing.

[0022] 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. Using the technical solution of this application, the head end of the sound-absorbing cotton is adapted to be selectively fixed to either the end of the annular wall away from the volute tongue or the end of the annular wall adjacent to the volute tongue, facilitating installation and improving the assembly efficiency of the sound-absorbing cotton.

[0023] It should be noted that, unless otherwise specified, the directional expressions such as "from top to bottom," "below," "bottom," "top," and "front" appearing in this application are based on the usual usage state of the range hood.

[0024] It should be noted that the terms "first," "second," "third," and "fourth" 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.

[0025] The above-described technical solutions in this application are not intended to describe all possible implementations of this application. Throughout the application, numerous examples are provided to offer guidance, and these examples can be used in various feasible combinations. [Attached Image Description]

[0026] The following figures are for illustrative purposes only and do not limit the scope of this application, wherein:

[0027] Figure 1 This is a schematic diagram showing the assembly relationship between an embodiment of a centrifugal fan for extracting oil fumes and its casing according to this application;

[0028] Figure 2 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;

[0029] Figure 3 This is a schematic diagram of the structure of a centrifugal fan embodiment for extracting oil fumes without the oil guide cover assembled;

[0030] Figure 4 This is a schematic diagram of the structure of an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0031] Figure 5 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;

[0032] Figure 6 This is a schematic diagram of the structure of a centrifugal fan embodiment for extracting oil fumes without the oil guide cover assembled;

[0033] Figure 7 This is a schematic diagram of the structure of an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0034] Figure 8 This is a schematic diagram of the structure of sound-absorbing cotton in an embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0035] Figure 9 yes Figure 8 A magnified view of a section at point A in the middle;

[0036] Figure 10 hour Figure 8 The diagram shows the structure of the sound-absorbing cotton from another perspective;

[0037] Figure 11 yes Figure 10 A magnified view of a section at point B in the middle;

[0038] Figure 12 hour Figure 8 The diagram shows the structure of the sound-absorbing cotton from another perspective;

[0039] Figure 13 yes Figure 12 A magnified view of a section at point C;

[0040] Figure 14 This is a schematic diagram of another embodiment of the centrifugal fan for extracting oil fumes in this application, without the sound-absorbing cotton and oil guide cover assembled;

[0041] Figure 15 This is a schematic diagram of another embodiment of the centrifugal fan for extracting oil fumes in this application, without the oil guide cover assembled;

[0042] Figure 16 This is a schematic diagram of another embodiment of a centrifugal fan for extracting oil fumes according to this application;

[0043] Figure 17 This is a schematic diagram of another embodiment of the centrifugal fan for extracting oil fumes in this application, without the sound-absorbing cotton and oil guide cover assembled;

[0044] Figure 18 This is a schematic diagram of another embodiment of the centrifugal fan for extracting oil fumes in this application, without the oil guide cover assembled;

[0045] Figure 19 This is a schematic diagram of another embodiment of a centrifugal fan used for extracting oil fumes according to this application.

[0046] Figure label:

[0047] 1-First sidewall, 2-Second sidewall, 3-Ring wall, 4-First fixing member, 5-Second fixing member, 6-First ear, 7-Second ear, 8-First connecting part, 9-Sound absorbing cotton, 10-Hot melt edge, 11-First mounting hole, 12-Second mounting hole, 13-Third mounting hole, 14-Fourth mounting hole, 15-Oil guide cover, 16-Third ear, 17-Fourth ear, 18-Second connecting part, 19-Motor, 20-Impeller, 21-First oil drain port, 22-Second oil drain port, 23-Rear shell, 24-Front plate.

Detailed Implementation Methods

[0048] 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.

[0049] This application discloses an embodiment of a centrifugal fan for extracting oil fumes, comprising a volute, sound-absorbing cotton 9, an oil guide shroud 15, a motor 19, and an impeller 20. Figure 1 , 4 As shown in Figure 7, the motor 19 and impeller 20 are housed within the volute. The motor 19 is configured to drive the impeller 20 to rotate, thereby generating negative pressure to extract fumes.

[0050] 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 1 , 3 As shown in Figures 4, 6, and 7. 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 protective enclosure around the "motor 19 and impeller 20," which are the main noise sources. Therefore, the noise reduction effect is good.

[0051] The annular wall 3 has a first fixing member 4 at its end away from the volute tongue, and a second fixing member 5 at its other end near the volute tongue, such as... Figures 1 to 7 As shown.

[0052] The sound-absorbing cotton 9 has a first mounting hole 11 and a second mounting hole 12 spaced at a certain distance along its extension direction at its head end, and a third mounting hole 13 and a fourth mounting hole 14 spaced at a certain distance along its extension direction at its tail end. Figure 8 As shown. Specifically, along the extension direction of the sound-absorbing cotton 9, from the head end to the tail end of the sound-absorbing cotton 9, the first mounting hole 11, the second mounting hole 12, the third mounting hole 13, and the fourth mounting hole 14 are sequentially arranged. Adjacent mounting holes are spaced a certain distance apart, except that the distance between the second mounting hole 12 and the third mounting hole 13 is relatively large. The extension direction of the sound-absorbing cotton 9 is as follows: Figure 8 As shown by the double-headed arrow T. It should be noted that the sound-absorbing cotton 9 has a symmetrical structure with respect to its center line. This center line is located at... Figure 8 The sound-absorbing cotton 9 is located in the middle, and the dividing line is perpendicular to the double-headed arrow T.

[0053] The head end of the sound-absorbing cotton 9 is configured to be selectively fixed to either the end of the annular wall 3 away from the volute tongue or the end of the annular wall 3 adjacent to the volute tongue. In other words, the head end of the sound-absorbing cotton 9 can be fixed to either the end of the annular wall 3 away from the volute tongue or the end of the annular wall 3 adjacent to the volute tongue. Both of these methods can achieve the goal of covering and fixing the sound-absorbing cotton 9 to the outer surface of the annular wall 3. Therefore, the installation operation of the sound-absorbing cotton 9 is very simple.

[0054] When the head end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 away from the volute tongue, the tail end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 adjacent to the volute tongue. The first fixing member 4 passes through the first mounting hole 11, and the second fixing member 5 passes through the third mounting hole 13. When the head end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 adjacent to the volute tongue, the tail end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 away from the volute tongue. The first fixing member 4 passes through the fourth mounting hole 14, and the second fixing member 5 passes through the second mounting hole 12. It should be noted that, due to the significant structural difference between the end of the annular wall 3 away from the volute tongue and the end of the annular wall 3 adjacent to the volute tongue, the distances between the first fixing member 4 and the second fixing member 5 and the corresponding ends of the sound-absorbing cotton 9 are not the same for ease of installation. The distance between the first fixing member 4 and the corresponding end of the sound-absorbing cotton 9 is less than the distance between the second fixing member 5 and the corresponding end of the sound-absorbing cotton 9. The end of the sound-absorbing cotton 9 on the corresponding side of the second fixing member 5 extends into the volute tongue, which helps to reduce noise at the volute tongue. Therefore, the sound-absorbing cotton 9 needs to be provided with two sets of mounting structures so that the head end of the sound-absorbing cotton 9 can be fixed either to the end of the annular wall 3 away from the volute tongue or to the end of the annular wall 3 adjacent to the volute tongue. In this embodiment, the sound-absorbing cotton 9 is provided with two sets of mounting structures, one of which is a combination of the first mounting hole 11 and the third mounting hole 13, and the other is a combination of the fourth mounting hole 14 and the second mounting hole 12.

[0055] 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 19 is fixed to the second sidewall 2.

[0056] A flange is provided at the air outlet of the volute. This flange is used to fix the volute to the housing. The flange has screw holes. 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 abuts against the flange at the end of the annular wall 3 away from the volute tongue. Specifically, when the head end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 away from the volute tongue, the head end of the sound-absorbing cotton 9 abuts against the flange, and the tail end of the sound-absorbing cotton 9 extends into the volute tongue; when the tail end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 away from the volute tongue, the tail end of the sound-absorbing cotton 9 abuts against the flange, and the head end of the sound-absorbing cotton 9 extends into the volute tongue.

[0057] The first fastener 4 is configured to bend and press against the outer surface of the sound-absorbing cotton 9 after passing through the corresponding mounting hole. The second fastener 5 is configured to bend and press against the outer surface of the sound-absorbing cotton 9 after passing through the corresponding mounting hole. Specifically, the first fastener 4 is made of a metal plate; preferably, the metal plate is a stainless steel plate. The second fastener 5 is also made of a metal plate; preferably, the metal plate is a stainless steel plate.

[0058] When the head end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 away from the volute tongue, the tail end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 near the volute tongue. The first fixing member 4 passes through the first mounting hole 11 and then bends and presses against the outer surface of the sound-absorbing cotton 9. The second fixing member 5 passes through the third mounting hole 13 and then bends and presses against the outer surface of the sound-absorbing cotton 9. When the head end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 near the volute tongue, the tail end of the sound-absorbing cotton 9 is fixed to the end of the annular wall 3 away from the volute tongue. The first fixing member 4 passes through the fourth mounting hole 14 and then bends and presses against the outer surface of the sound-absorbing cotton 9. The second fixing member 5 passes through the second mounting hole 12 and then bends and presses against the outer surface of the sound-absorbing cotton 9.

[0059] The first fixing member 4 has a perforated hole to facilitate bending. The first fixing member 4 is a sheet-like piece, and its free end is configured to be bent towards the air outlet of the volute. Specifically, the first fixing member 4 is an L-shaped sheet-like piece, including a first base plate and a first rocker plate, such as... Figure 2 As shown. The first base plate is configured to be fixed to the annular wall 3. The free end of the first rocker is configured to bend toward the air outlet of the volute; in other words, the free end of the first rocker is configured to bend toward the flange edge of the volute.

[0060] The second fixing member 5 has a perforated hole to facilitate bending. The second fixing member 5 is a sheet-like piece, and its free end is configured to bend toward the volute tongue. Specifically, the second fixing member 5 is an L-shaped sheet-like piece, including a second base plate and a second rocker plate. The second base plate is configured to be fixed to the annular wall 3, and the free end of the second rocker plate is configured to bend toward the volute tongue. This allows the end of the sound-absorbing cotton 9 on the corresponding side to be squeezed into the volute tongue, which helps to reduce noise at the volute tongue.

[0061] The oil guide cover 15 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 1 , 4 As shown in Figure 7, 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 15 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.

[0062] Both ends of the oil guide cover 15 have oil leakage ports spaced apart from the sound-absorbing cotton 9. Specifically, one end of the oil guide cover 15 has a first oil leakage port 21 spaced apart from the sound-absorbing cotton 9, and the other end of the oil guide cover 15 has a second oil leakage port 22 spaced apart from the sound-absorbing cotton 9. Figure 1 , 4As shown in Figure 7, some of the grease on the outer surface of the sound-absorbing cotton 9 flows downwards into the first oil drain 21; some of the grease on the outer surface of the sound-absorbing cotton 9 flows downwards into the second oil drain 22; this grease flowing into the first oil drain 21 and the second oil drain 22 will eventually be discharged from the third oil drain hole of the oil guide cover 15. It should be noted that, since the oil guide cover 15 is suspended at 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 15 is also used to fix the sound-absorbing cotton 9.

[0063] The sound-absorbing cotton 9 comprises 60-70 wt% PP, 30-40 wt% PET, and 3-6 wt% flame retardant. Specifically, the surface of the sound-absorbing cotton 9 is non-woven fabric, and the non-woven fabric contains filling material. The filling material comprises 60-70 wt% PP, 30-40 wt% PET, and 3-6 wt% flame retardant. PP is polypropylene; PET is polyethylene terephthalate. Extensive testing has shown that using 3-6 wt% flame retardant does not significantly affect the noise reduction effect and meets safety requirements by passing the needle flame test. Preferably, the sound-absorbing cotton 9 contains 5% flame retardant. Preferably, the flame retardant is made of flame-retardant polyester fiber and / or flame-retardant fiberglass cloth.

[0064] The sound-absorbing cotton 9 is equipped with a heat-fused edge 10, such as Figures 8 to 13 As shown. The width of the heat-fused edge 10 is equal to 2mm. Extensive testing has verified that a width of 2mm for the heat-fused edge 10 ensures that, on the one hand, the width is not too small, preventing the filling material within the non-woven fabric from easily dispersing; on the other hand, the width is not too large, thus meeting safety requirements in the needle flame test. It should be noted that the heat-fused edge 10 is located around the perimeter of the sound-absorbing cotton 9, extending outwards relative to the main body of the sound-absorbing cotton 9. The "width of the heat-fused edge 10" is the distance by which the heat-fused edge 10 extends outwards relative to the main body of the sound-absorbing cotton 9.

[0065] By way of example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the first fixing member 4 is provided with a notch to facilitate bending. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0066] As an example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the first fixing member 4 is provided with a semi-shear structure to facilitate bending. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0067] As an example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the second fixing member 5 is provided with a notch to facilitate bending. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0068] By way of example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the second fixing member 5 is provided with a semi-shear structure 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.

[0069] By way of example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the first fixing member 4 is a U-shaped plate, such as... Figure 14 , 15 As shown in Figure 16, the first fixing member 4 includes a first ear 6, a second ear 7, and a first connecting portion 8. The first connecting portion 8 is connected between the first ear 6 and the second ear 7. The free end of the first ear 6 is configured to bend toward the first sidewall 1. The free end of the second ear 7 is configured to bend toward the second sidewall 2. The bending direction of the free end of the first ear 6 is opposite to the bending direction of the free end of the second ear 7, as shown in Figure 16. Figure 16 As shown. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0070] By way of example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the second fixing member 5 is a U-shaped plate, such as... Figure 17 , 18 As shown in Figure 19, the second fastener 5 includes a third ear 16, a fourth ear 17, and a second connecting portion 18. The second connecting portion 18 is connected between the third ear 16 and the fourth ear 17. The free end of the third ear 16 is configured to bend toward the first sidewall 1. The free end of the fourth ear 17 is configured to bend toward the second sidewall 2. The bending direction of the free end of the third ear 16 is opposite to the bending direction of the free end of the fourth ear 17, as shown in Figure 19. Figure 19 As shown. This embodiment focuses on illustrating the differences from the above embodiments; for the same or similar parts of this embodiment, please refer to the above embodiments.

[0071] For example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the width of the heat-fused edge 10 is equal to 2.5 mm. Extensive testing has verified that when the width of the heat-fused edge 10 is equal to 2.5 mm, on the one hand, the width of the heat-fused edge 10 is not too small, thus preventing the filling material inside the non-woven fabric from easily dispersing; on the other hand, the width of the heat-fused edge 10 is not too large, thus meeting safety requirements by passing the needle flame test. 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.

[0072] For example, in another embodiment of the centrifugal fan for extracting oil fumes proposed in this application, the width of the heat-fused edge 10 is equal to 1.5 mm. Extensive testing has verified that when the width of the heat-fused edge 10 is equal to 1.5 mm, on the one hand, the width of the heat-fused edge 10 is not too small, thus preventing the filling material inside the non-woven fabric from easily dispersing; on the other hand, the width of the heat-fused edge 10 is not too large, thus meeting safety requirements by passing the needle flame test. 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.

[0073] 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.

[0074] The housing, including the rear cover 23 and the front panel 24, such as Figure 1 As shown. The rear casing 23 is generally rectangular in shape and has a bottom opening, a top opening, and a front opening. The front opening of the rear casing 23 is used for the centrifugal fan to pass through, be inserted into, and be fixed inside the rear casing 23. After the centrifugal fan is fixed inside the rear casing 23, the front opening of the rear casing 23 is closed by the front plate 24. When the centrifugal fan runs inside the casing, it generates negative pressure, forming an airflow. The airflow flows into the casing through the bottom opening of the rear casing 23, and flows out from the top opening of the rear casing 23 after passing through the centrifugal fan.

[0075] An electrical box is provided on the top wall of the rear housing 23, and the electrical box is adjacent to the top opening of the rear housing 23, such as... Figure 1 As shown.

[0076] 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 (19), and an impeller (20), 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 (4) at one end away from the volute tongue and a second fixing member (5) at the other end near the volute tongue. The sound-absorbing cotton (9) has a first mounting hole (11) and a second mounting hole (12) at a certain distance along the extension direction of the sound-absorbing cotton (9) at its head end, and a third mounting hole (13) and a fourth mounting hole (14) at a certain distance along the extension direction of the sound-absorbing cotton (9) at its tail end. The head end of the sound-absorbing cotton (9) is configured to be selectively fixed to either the end of the annular wall (3) away from the volute tongue or the end of the annular wall (3) near the volute tongue. When the head end of the sound-absorbing cotton (9) is fixed to the end of the ring wall (3) away from the volute tongue, the first fixing member (4) passes through the first mounting hole (11), and the second fixing member (5) passes through the third mounting hole (13). When the head end of the sound-absorbing cotton (9) is fixed to one end of the ring wall (3) near the volute tongue, the first fixing member (4) passes through the fourth mounting hole (14), and the second fixing member (5) passes through the second mounting hole (12).

2. The centrifugal fan according to claim 1, characterized in that: The first fastener (4) is configured to bend and press against the outer surface of the sound-absorbing cotton (9) after passing through the corresponding mounting hole; The second fastener (5) is configured to bend and press against the outer surface of the sound-absorbing cotton (9) after passing through the corresponding mounting hole.

3. The centrifugal fan according to claim 2, characterized in that: The first fastener (4) is provided with a hollow hole, a notch or a half-cut structure to facilitate bending; The second fastener (5) is provided with a hollow hole, a notch or a half-cut structure to facilitate bending.

4. The centrifugal fan according to claim 2, characterized in that: The first fixing member (4) is a sheet-like piece, and the free end of the first fixing member (4) is configured to be bent toward the air outlet of the volute; and / or The second fixing member (5) is a sheet-like piece, and the free end of the second fixing member (5) is configured to bend toward the volute tongue; and / or The first fixing member (4) is an L-shaped sheet member, including a first base plate and a first rocker plate, wherein the first base plate is configured to be fixed to the annular wall (3); and / or The second fixing member (5) is an L-shaped sheet member, including a second base plate and a second rocker plate, wherein the second base plate is configured to be fixed to the annular wall (3).

5. The centrifugal fan according to claim 2, characterized in that: The first fastener (4) is a U-shaped piece; The first fastener (4) includes a first ear (6), a second ear (7), and a first connecting part (8); The first connecting part (8) is connected between the first ear part (6) and the second ear part (7); The free end of the first ear (6) is configured to bend toward the first sidewall (1); The free end of the second ear (7) is configured to bend toward the second sidewall (2).

6. The centrifugal fan according to claim 2, characterized in that: The second fastener (5) is a U-shaped piece; The second fastener (5) includes a third ear (16), a fourth ear (17), and a second connecting part (18); The second connecting part (18) is connected between the third ear part (16) and the fourth ear part (17); The free end of the third ear (16) is configured to bend toward the first sidewall (1); The free end of the fourth ear (17) is configured to bend toward the second sidewall (2).

7. The centrifugal fan according to any one of claims 1 to 6, characterized in that: Includes an oil guide cover (15), 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 (15) 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 (15) are spaced apart from the sound-absorbing cotton (9) to form oil leakage ports.

8. The centrifugal fan according to any one of claims 1 to 6, characterized in that: The sound-absorbing cotton (9) is provided with a heat-fused edge (10); The width of the hot-melt edge (10) is less than or equal to 2.5 mm.

9. The centrifugal fan according to claim 8, characterized in that: The width of the hot-melt edge (10) is equal to 2 mm; or The width of the hot-melt edge (10) is greater than or equal to 1.5 mm.

10. The centrifugal fan according to any one of claims 1 to 6, characterized in that: The sound-absorbing cotton (9) contains 60-70 wt% PP and 30-40 wt% PET.

11. The centrifugal fan according to claim 10, characterized in that: The sound-absorbing cotton (9) contains 3-6 wt% flame retardant.

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

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