Air duct system of range hood and range hood

Abstract

The invention relates to the technical field of range hoods, in particular to an air duct system of a range hood and the range hood, and aims to solve the problems that due to the fact that a motor support is connected with a volute, the weight of a motor and vibration generated during working are borne by the volute independently, the volute is prone to damage or deformation, noise is generated, and user experience is reduced. In order to achieve the purpose, the air duct system of the range hood comprises a shell, a motor, a volute and a motor bracket, the volute is arranged in the shell and detachably connected with the shell, the motor is arranged in the volute, the motor support is connected with the motor, and the motor support extends out of the volute and is further connected with the shell, so that the situation that the volute bears the weight of the motor and vibrates during working is avoided. According to the air duct system of the range hood, the motor support is connected with the motor and the shell, the volute does not bear the weight of the motor and vibration generated during working, the volute cannot be damaged or deformed, noise is avoided, and the user experience is improved.

Description

Technical Field

[0001] This invention relates to the technical field of range hoods, specifically providing a duct system for a range hood and a range hood itself. Background Technology

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It is installed above the kitchen stove and can quickly remove the waste from the stove and the harmful fumes produced during cooking, exhausting them outdoors. At the same time, it condenses and collects the fumes, reducing pollution, purifying the air, and providing safety features such as protection against poisoning and explosion.

[0003] A range hood includes a duct system and a filtration system. The filtration system comprises a smoke hood, a control panel, operation buttons, a control panel, a filter screen, a mesh cover, and an grease cup. Specifically, the control panel is mounted on the front of the smoke hood, the operation buttons are connected to the control panel, the control panel is located on the bottom surface of the smoke hood, the filter screen is installed in the center of the control panel, the mesh cover is located below the filter screen and connected to the control panel, and the grease cup is installed in the center of the bottom surface of the mesh cover.

[0004] The air duct system includes a housing, motor, volute, motor bracket, and impeller. Specifically, the volute is located inside the housing and connected to it; the motor is located inside the volute and communicates with the control board; one end of the motor bracket is connected to the motor, and the other end is connected to the volute; the impeller is located inside the volute and connected to the motor's power output shaft. Because the motor bracket is connected to the volute, the volute bears the weight of the motor and the vibrations generated during operation. This makes the volute susceptible to damage or deformation, resulting in noise and a degraded user experience.

[0005] Accordingly, there is a need in the art for a new range hood duct system and a new range hood to solve the above problems. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that in the existing motor bracket and volute connection, the motor's own weight and the vibration generated during operation are all borne by the volute alone, which makes the volute prone to damage or deformation, thus generating noise and reducing the user experience.

[0007] In a first aspect, the present invention provides a duct system for a range hood, the duct system comprising a housing, a motor, a volute housing, and a motor bracket;

[0008] The volute is disposed inside the outer shell and is detachably connected to the outer shell. The motor is disposed inside the volute. The motor bracket is connected to the motor. The motor bracket extends out of the volute and is also connected to the outer shell to prevent the volute from bearing the weight of the motor itself and the vibration generated during operation.

[0009] In the preferred technical solution of the above-mentioned range hood duct system, the motor bracket includes a mounting ring and multiple support plates;

[0010] The mounting ring and the motor are detachably connected to secure the motor.

[0011] Multiple support plates are arranged equidistantly around the mounting ring in the circumferential direction, and one end of each support plate is integrally formed with the mounting ring. A folding piece is provided at the other end of each support plate, and the folding piece and the outer shell are detachably connected.

[0012] In the preferred technical solution of the above-mentioned range hood duct system, the motor is provided with a convex ring in the middle, and a plurality of first mounting through holes are machined at equal intervals on the convex ring.

[0013] In the preferred technical solution of the above-mentioned range hood duct system, a plurality of second mounting through holes are equally spaced on the mounting ring, and each of the second mounting through holes and the plurality of first mounting through holes are arranged in a one-to-one correspondence and connected by a first screw, so that the motor and the motor bracket can be detachably connected.

[0014] In the preferred technical solution of the duct system of the above-mentioned range hood, each of the folding flaps is provided with multiple third mounting through holes.

[0015] In the preferred technical solution of the above-mentioned range hood duct system, the housing is provided with a plurality of fourth mounting through holes, and the plurality of fourth mounting through holes and the plurality of third mounting through holes are arranged in a one-to-one correspondence and connected by a second screw, so that the motor bracket and the housing are detachably connected.

[0016] In the preferred technical solution of the above-mentioned range hood duct system, the volute is made of plastic.

[0017] In the preferred technical solution of the above-mentioned range hood duct system, the volute includes a first volute housing, a second volute housing, a first mounting part, and a second mounting part;

[0018] The first volute and the second volute are arranged opposite to each other and connected. The first volute and the second volute have the same structure and are both disc-shaped.

[0019] The first mounting part is integrally constructed on both sides of the first volute housing and is used for detachable connection with the housing;

[0020] The second mounting part is integrally constructed on both sides of the second volute housing and is used for detachable connection with the housing.

[0021] In the preferred embodiment of the duct system of the above-mentioned range hood, the first volute housing is provided with a first through hole so that the motor bracket extends out of the volute housing along the first through hole.

[0022] The duct system of the range hood in this application is connected to the motor and the outer casing respectively through the motor bracket. In this way, the volute does not bear the weight of the motor itself and the vibration generated during operation. Therefore, the volute will not be damaged or deformed, which can avoid noise caused by damage or deformation of the volute and thus improve the user experience.

[0023] Furthermore, the volute housing in the duct system of the range hood of the present invention is made of plastic. Compared with traditional metal volute housings, plastic volute housings have better plasticity, are easier to process, and have lower material costs. This plastic volute housing is not connected to the motor and does not bear the weight of the motor itself or the vibrations generated during operation. Therefore, even with a plastic volute housing, it will not be damaged or deformed, avoiding noise caused by damage or deformation of the volute housing, thereby improving the user experience.

[0024] In a second aspect, the present invention provides a range hood, the range hood comprising the duct system of the range hood described in the first aspect.

[0025] The range hood of this technical solution includes the air duct system of the range hood of any technical solution of the present invention, and therefore has all the technical effects of the air duct system of the range hood of any technical solution of the present invention. Attached Figure Description

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is an exploded view of the air duct system of a range hood according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the motor bracket of the air duct system of a range hood according to the present invention;

[0029] Figure 3 This is a schematic diagram of the motor structure of the air duct system of a range hood according to the present invention;

[0030] Figure 4 This is a main schematic diagram of the volute housing of the air duct system of a range hood according to the present invention;

[0031] Figure 5 This is a schematic diagram of the volute structure of the air duct system of a range hood according to the present invention;

[0032] Figure 6 This is a main schematic diagram of the impeller of the air duct system of a range hood according to the present invention.

[0033] List of markers in the diagram:

[0034] 1. Casing; 2. Motor; 3. Volute; 4. Motor bracket; 5. Impeller;

[0035] 11. Front panel; 12. First side panel; 13. Second side panel; 14. Back panel; 15. Top panel; 16. Smoke exhaust vent;

[0036] 21. Protruding ring; 22. First mounting through hole;

[0037] 31. First volute housing; 32. Second volute housing; 33. First mounting part; 34. Second mounting part;

[0038] 311. First plate; 312. First annular plate; 313. First through hole; 314. First top notch;

[0039] 321. Second plate; 322. Second annular plate; 323. Second through hole; 324. Second top notch; 331. First protrusion; 341. Third protrusion;

[0040] 41. Mounting ring; 42. Multiple support plates; 43. Folding plate; 44. Second mounting through hole; 45. Third mounting through hole;

[0041] 421. First support piece; 422. Second support piece; 423. Third support piece; 424. Fourth support piece. Detailed Implementation

[0042] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the duct system and technical principles of the range hood of the present invention, and are not intended to limit the scope of protection of the present invention.

[0043] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] A range hood is a kitchen appliance that purifies the kitchen environment. It is installed above the kitchen stove and can quickly remove the waste from the stove and the harmful fumes produced during cooking, exhausting them outdoors. At the same time, it condenses and collects the fumes, reducing pollution, purifying the air, and providing safety features such as protection against poisoning and explosion.

[0046] A range hood includes a duct system and a filtration system. The filtration system comprises a smoke hood, a control panel, operation buttons, a control panel, a filter screen, a mesh cover, and an grease cup. Specifically, the control panel is mounted on the front of the smoke hood, the operation buttons are connected to the control panel, the control panel is located on the bottom surface of the smoke hood, the filter screen is installed in the center of the control panel, the mesh cover is located below the filter screen and connected to the control panel, and the grease cup is installed in the center of the bottom surface of the mesh cover.

[0047] The air duct system includes a housing, motor, volute, motor bracket, and impeller. Specifically, the volute is located inside the housing and connected to it; the motor is located inside the volute and communicates with the control board; one end of the motor bracket is connected to the motor, and the other end is connected to the volute; the impeller is located inside the volute and connected to the motor's power output shaft. Because the motor bracket is connected to the volute, the volute bears the weight of the motor and the vibrations generated during operation. This makes the volute susceptible to damage or deformation, resulting in noise and a degraded user experience.

[0048] To address the aforementioned problems, this application provides a duct system for a range hood, which generally includes a housing 1, a motor 2, a volute 3, and a motor bracket 4. The volute 3 is disposed inside the housing 1 and is detachably connected to it. The motor 2 is disposed inside the volute 3. The motor bracket 4 is connected to the motor 2 and extends outward from the volute 3, also connecting to the housing 1, thus preventing the volute 3 from bearing the weight of the motor 2 and the vibrations generated during operation.

[0049] By connecting the motor bracket 4 to the motor 2 and the housing 1 respectively, the volute 3 does not bear the weight of the motor 2 itself or the vibration generated during operation. Therefore, the volute 3 will not be damaged or deformed, which can avoid noise caused by damage or deformation of the volute 3, thereby improving the user experience.

[0050] The following is combined Figures 1 to 6 The duct system and the range hood of this application are described.

[0051] See Figure 1 The first aspect of this application provides a duct system for a range hood, which generally includes a housing 1, a motor 2, a volute 3, and a motor bracket 4. The volute 3 is disposed inside the housing 1 and is detachably connected to the housing 1. The motor 2 is disposed inside the volute 3. The motor bracket 4 is connected to the motor 2 and extends outward from the volute 3, also connecting to the housing 1, thus preventing the volute 3 from bearing the weight of the motor 2 and the vibrations generated during operation.

[0052] The duct system of the range hood in this application is connected to the motor 2 and the outer casing 1 respectively through the motor bracket 4. In this way, the volute 3 does not bear the weight of the motor 2 itself and the vibration generated during operation. Therefore, the volute 3 will not be damaged or deformed, which can avoid noise caused by damage or deformation of the volute 3, thereby improving the user experience.

[0053] It should be noted that this invention does not specifically describe other structures of the range hood besides the duct system, which are well known to those skilled in the art based on existing technology.

[0054] See Figure 1 In a preferred embodiment of the duct system of the range hood described above, the outer casing 1 generally includes a panel 11, a first side panel 12, a second side panel 13, a back panel 14, and a top panel 15. Optionally, the front edge of the first side panel 12 and one side edge of the panel 11 are integrally formed to improve robustness, or the front edge of the first side panel 12 and one side edge of the panel 11 can also be connected by screws for easy disassembly and maintenance. The panel 11 is generally rectangular, and the first side panel 12 is also rectangular and their dimensions are compatible. Optionally, the front edge of the second side panel 13 and the other side edge of the panel 11 are integrally formed to improve robustness, or the front edge of the second side panel 13 and the other side edge of the panel 11 can also be connected by screws for easy disassembly and maintenance. The second side panel 13 is rectangular and its dimensions are compatible with the dimensions of the panel 11. The dimensions and structure of the second side panel 13 and the first side panel 12 are the same.

[0055] See Figure 1 In this embodiment, the panel 11, the first side plate 12, and the second side plate 13 are connected to form a semi-enclosed cavity structure for housing the motor 2, the motor bracket 4, and the impeller 5. One side of the back plate 14 is connected to the rear side of the first side plate 12 by screws for easy disassembly and maintenance. The other side of the back plate 14 is also connected to the rear side of the second side plate 13 by screws for easy disassembly and maintenance. The top plate 15 is located on top of the panel 11, the first side plate 12, the second side plate 13, and the back plate 14, and is connected to the top of the panel 11, the first side plate 12, the second side plate 13, and the back plate 14 by screws for easy disassembly and maintenance.

[0056] Continue reading Figure 1 In this embodiment, the top plate 15 has a smoke exhaust hole 16, which can be located on one side or in the middle of the top plate 15, depending on actual needs. Optionally, the smoke exhaust hole 16 can be rectangular or circular.

[0057] Continue reading Figure 1 In this embodiment, the bottom of the panel 11, the first side panel 12, the second side panel 13 and the back panel 14 form a rectangular opening for connecting to the smoke collection hood of the range hood's filtration system.

[0058] Please refer to further reading Figure 1 In this embodiment, the panel 11, the first side panel 12, the second side panel 13, the back panel 14, and the top panel 15 are all made of metal, which has good rigidity and avoids deformation or damage.

[0059] As one possible implementation, the panel 11, the first side panel 12, the second side panel 13, the top panel 15, and the smoke exhaust hole 16 opened on the top panel 15 can be integrally processed by a mold, which can reduce installation time, save processes, and improve stability.

[0060] See Figure 2 and Figure 1 In the preferred embodiment of the duct system of the aforementioned range hood, to achieve the connection between the motor 2 and the outer casing 1, specifically, the motor bracket 4 generally includes a mounting ring 41 and multiple support plates 42. The mounting ring 41 is detachably connected to the motor 2 to fix the motor 2. The multiple support plates 42 are arranged equidistantly around the circumference of the mounting ring 41, with one end of each support plate 42 integrally formed with the mounting ring 41, and a folding plate 43 provided at the other end of each support plate 42. The folding plate 43 is detachably connected to the outer casing 1. By setting the mounting ring 41, multiple support plates 42, and folding plate 43, the motor 2 and the outer casing 1 can be connected, so the volute 3 is not connected to the motor 2. Therefore, the volute 3 no longer bears the weight of the motor 2 and the vibration generated by the motor 2 during operation. Consequently, the volute 3 will not be damaged or deformed, avoiding noise generation and improving the user experience.

[0061] See Figure 2 In this embodiment, the mounting ring 41 is preferably circular to fit the shape of the motor 2. The through hole in the middle of the mounting ring 41 is circular and its size is matched with the cross-sectional size of the motor 2 so that the motor 2 can be inserted into the mounting ring 41.

[0062] Continue reading Figure 2In this embodiment, the plurality of support pieces 42 generally include a first support piece 421, a second support piece 422, a third support piece 423, and a fourth support piece 424. The first support piece 421 and the third support piece 423 are symmetrically arranged, as are the second support piece 422 and the fourth support piece 424. The first support piece 421, the second support piece 422, the third support piece 423, and the fourth support piece 424 all have the same structural dimensions, and each of them is a rectangle.

[0063] See Figure 3 and Figure 2 In the preferred embodiment of the duct system of the aforementioned range hood, to achieve a detachable connection between the motor 2 and the motor bracket 4, specifically, the motor 2 has a convex ring 21 in the middle, and a plurality of first mounting through holes 22 are equally spaced on the convex ring 21. A plurality of second mounting through holes 44 are equally spaced on the mounting ring 41, and the plurality of second mounting through holes 44 and the plurality of first mounting through holes 22 are arranged in a one-to-one correspondence and connected by first screws, so that the motor 2 and the motor bracket 4 can be detachably connected. The mounting ring 41 is fitted onto the motor 2 and abuts against the convex ring 21, the first mounting through holes 22 and the second mounting through holes 44 correspond to each other, and are connected by first screws, so that the motor 2 and the motor bracket 4 can be detachably connected, allowing for disassembly and replacement for repair when the motor 2 or the motor bracket 4 is damaged.

[0064] In this embodiment, the convex ring 21 and the housing of the motor 2 are integrally formed. Furthermore, the convex ring 21 is circular and made of metal to improve rigidity and strength.

[0065] Continue reading Figure 2 In the preferred embodiment of the duct system of the above-mentioned range hood, to achieve a detachable connection between the motor 2 and the housing 1, each folding flap 43 is provided with multiple third mounting through holes 45. The housing 1 is provided with multiple fourth mounting through holes, and the multiple fourth mounting through holes and multiple third mounting through holes 45 are arranged in a one-to-one correspondence and connected by second screws, so that the motor 2 bracket and the housing 1 are detachably connected. By connecting the folding flap 43 and the housing 1, the motor 2 and the housing 1 are connected. Because the housing 1 is large in volume and has good rigidity and sturdiness, it can withstand the weight of the motor 2 and the vibration during the use of the motor 2, and will not be damaged or deformed even after long-term use.

[0066] Please refer to further reading Figure 2 Specifically, the other ends of the first support piece 421, the second support piece 422, the third support piece 423 and the fourth support piece 424 are all pressed with folded pieces 43, which are rectangular.

[0067] See Figure 4In the preferred embodiment of the duct system of the aforementioned range hood, the volute 3 is made of plastic to reduce costs. Compared to traditional metal volutes, the plastic volute 3 has better plasticity, is easier to process, and has lower material costs. Since the plastic volute 3 is not connected to the motor 2 and does not bear the weight or vibration of the motor 2, it will not be damaged or deformed even when made of plastic, thus avoiding noise caused by damage or deformation of the volute 3 and improving the user experience.

[0068] See Figure 5 and Figure 1 In the preferred embodiment of the duct system of the aforementioned range hood, the volute 3 generally includes a first volute 31, a second volute 32, a first mounting portion 33, and a second mounting portion 34. The first volute 31 and the second volute 32 are arranged opposite to each other and connected, and both have the same structure and are disc-shaped. The first mounting portion 33 is integrally constructed on both sides of the first volute 31 for detachable connection with the housing 1. The second mounting portion 34 is integrally constructed on both sides of the second volute 32 for detachable connection with the housing 1. The first volute 31 and the second volute 32 together form the volute 3, which covers the motor 2. The first mounting portion 33 and the second mounting portion 34 are detachably connected with the housing 1, thus fixing the volute 3. The volute 3 is a conventional volute 3, differing only in material.

[0069] Optionally, the first volute housing 31 and the second volute housing 32 are connected by screws.

[0070] In this embodiment, the first volute housing 31 generally includes a first plate 311, a first annular plate 312, a first through hole 313, and a first top notch 314. The front edge of the first annular plate 312 and the outer edge of the first plate 311 are integrally pressed together to form a disc with a certain depth. The first through hole 313 is located in the middle of the first plate 311 and is used for multiple support plates 42 of the motor bracket 4 to extend outwards from the volute housing 3. The first top notch 314 is located on the upper part of the first annular plate 312 and is correspondingly and connected to the exhaust vent 16 for exhausting oil fumes.

[0071] In this embodiment, the second volute housing 32 generally includes a second plate 321, a second annular plate 322, a second through hole 323, and a second top notch 324. The front edge of the second annular plate 322 and the outer edge of the second plate 321 are integrally pressed together to form a disc with a certain depth. The second through hole 323 is located in the middle of the second plate 321 for the entry of oil fumes. The second top notch 324 is located on the upper part of the second annular plate 322 and is correspondingly provided with and communicates with the exhaust vent 16 for the discharge of oil fumes. The second top notch 324 and the first top notch 314 form an opening that connects to the exhaust vent 16.

[0072] In this embodiment, the first mounting portion 33 generally includes a first protrusion 331 and a first mounting screw hole constructed on the first protrusion 331. The first protrusion 331 and one side of the first annular plate 312 of the first volute housing 31 are integrally formed, and there is a first gap between the inner side of the first protrusion 331 and one side of the first annular plate 312. The first mounting screw hole and the first side plate 12 are connected by screws, which facilitates disassembly, assembly, maintenance and replacement. Alternatively, the first protrusion 331 and one side of the first annular plate 312 can also be connected by a snap-fit ​​mechanism.

[0073] In this embodiment, the first mounting portion 33 further includes a second protrusion (not shown in the figure) and a second mounting screw hole formed on the second protrusion. The second protrusion and the other side of the first annular plate 312 of the first volute housing are integrally formed, and there is a second gap between the inner side of the second protrusion and the other side of the first annular plate 312. The second mounting screw hole and the second side plate 13 are connected by screws, which facilitates disassembly, assembly, maintenance and replacement. Alternatively, the second protrusion and the other side of the first annular plate 312 can also be connected by a snap-fit ​​mechanism.

[0074] In this embodiment, the second mounting portion 34 generally includes a third protrusion 341 and a third mounting screw hole constructed on the third protrusion 341. The third protrusion 341 and one side of the second annular plate 322 of the second volute housing 32 are integrally formed, and there is a third gap between the inner side of the third protrusion 341 and the other side of the second annular plate 322. The third mounting screw hole and the first side plate 12 are connected by screws, which facilitates disassembly, assembly, maintenance and replacement. Alternatively, the third protrusion 341 and one side of the second annular plate 322 can also be connected by a snap-fit ​​mechanism.

[0075] In this embodiment, the second mounting portion 34 further includes a fourth protrusion (not shown in the figure) and a fourth mounting screw hole formed on the fourth protrusion. The fourth protrusion and the other side of the second annular plate 322 of the second volute housing 32 are integrally formed, and there is a fourth gap between the inner side of the fourth protrusion and the other side of the second annular plate 322. The fourth mounting screw hole and the second side plate 13 are connected by screws, which facilitates disassembly, assembly, maintenance and replacement. Alternatively, the fourth protrusion and the other side of the second annular plate 322 can also be connected by a snap-fit ​​mechanism.

[0076] In a second aspect, the present invention provides a range hood that includes the duct system of the range hood of the first aspect. The range hood of this technical solution includes the duct system of the range hood of any technical solution of the present invention, and therefore possesses all the technical effects of the duct system of the range hood of any technical solution of the present invention.

[0077] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A duct system for a range hood, characterized in that, The air duct system includes a housing, a motor, a volute, and a motor bracket; The volute is disposed inside the outer shell and is detachably connected to the outer shell. The motor is disposed inside the volute. The motor bracket is connected to the motor. The motor bracket extends out of the volute and is also connected to the outer shell to prevent the volute from bearing the weight of the motor itself and the vibration generated during operation.

2. The duct system of the range hood according to claim 1, characterized in that, The motor bracket includes a mounting ring and multiple support plates; The mounting ring and the motor are detachably connected to secure the motor. Multiple support plates are arranged equidistantly around the mounting ring in the circumferential direction, and one end of each support plate is integrally formed with the mounting ring. A folding piece is provided at the other end of each support plate, and the folding piece and the outer shell are detachably connected.

3. The duct system of the range hood according to claim 2, characterized in that, The motor has a convex ring in the middle, and multiple first mounting through holes are machined at equal intervals on the convex ring.

4. The duct system of the range hood according to claim 3, characterized in that, The mounting ring has multiple second mounting through holes at equal intervals, and the multiple second mounting through holes and the multiple first mounting through holes are arranged in a one-to-one correspondence and connected by a first screw, so that the motor and the motor bracket can be detachably connected.

5. The duct system of the range hood according to claim 2, characterized in that, Each of the aforementioned folding pieces has multiple third mounting through holes.

6. The duct system of the range hood according to claim 5, characterized in that, The housing has multiple fourth mounting through holes, and the multiple fourth mounting through holes and the multiple third mounting through holes are arranged in a one-to-one correspondence and connected by a second screw, so that the motor bracket and the housing can be detachably connected.

7. The duct system of the range hood according to claim 5, characterized in that, The volute is made of plastic.

8. The duct system of the range hood according to claim 7, characterized in that, The volute includes a first volute housing, a second volute housing, a first mounting portion, and a second mounting portion; The first volute and the second volute are arranged opposite to each other and connected. The first volute and the second volute have the same structure and are both disc-shaped. The first mounting part is integrally constructed on both sides of the first volute housing and is used for detachable connection with the housing; The second mounting part is integrally constructed on both sides of the second volute housing and is used for detachable connection with the housing.

9. The duct system of the range hood according to claim 8, characterized in that, The first volute housing has a first through hole so that the motor bracket extends out of the volute housing along the first through hole.

10. A range hood, characterized in that, The range hood includes the duct system of the range hood according to any one of claims 1-9.

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