Fan shell assembly and range hood comprising same

Abstract

The utility model provides a fan shell assembly and a range hood comprising the same, a fan shell comprises a front cover, a rear cover and an annular wall, the front cover and the rear cover are provided with through holes along the axial direction of the fan shell, and two sides of the annular wall are connected with the front cover and the rear cover to form a smoke exhaust channel. A cavity surrounded by the smoke exhaust channel and used for containing the fan and the impeller is further arranged in the fan shell, a smoke inlet of the fan for sucking smoke is located on one side of the front cover, and at least one protruding part outwards in the radial direction of the annular wall is arranged on the annular wall. The wall surface, close to the rear cover, of the annular wall is provided with at least one bending plane which inclines inwards in the radial direction of the annular wall. According to the fan shell assembly and the range hood comprising the fan shell assembly, the outward protruding part and / or the inward bent plane are / is arranged on the annular wall, so that an annular wall structure with a variable cross section is formed, a flow field in a fan shell is improved, airflow impact is reduced, airflow stability is improved, noise is reduced, and a user has better use experience.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a fan housing component and a range hood comprising the same. Background Art

[0002] The core power component of the range hood is the fan system, which generally includes an impeller assembly, a motor component (i.e., a fan that extracts oil fume gas), an air inlet ring and a volute assembly, wherein the volute assembly is a fan housing assembly that accommodates the fan, impeller assembly and other components, and includes a front cover, a rear cover and an annular wall of the volute, and the annular wall is connected to the front cover and the rear cover to form a smoke exhaust channel after the fan extracts the oil fume gas. Therefore, the size parameter design of the volute assembly directly affects the aerodynamic performance of the fan system.

[0003] In the prior art, the fan system design usually adopts an equal thickness design, that is, the annular wall is designed with a constant cross-section along the smoke exhaust direction. Under such design parameters, when the airflow enters the range hood from the bottom, it will impact the annular wall, especially the bottom of the annular wall, causing the airflow to be unstable and forming an invalid flow area, thereby affecting the airflow operation, generating higher noise, and reducing the exhaust air volume and exhaust efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of unstable airflow and high noise of smoke exhaust of range hoods in the prior art, and to provide a fan housing assembly and a range hood including the same.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A fan housing assembly, the fan housing assembly includes a fan housing, the fan housing includes a front cover, a rear cover and an annular wall, the front cover and the rear cover are provided with through holes along the axial direction of the fan housing, the two sides of the annular wall are connected to the front cover and the rear cover to form a smoke exhaust channel, the fan housing also includes a cavity surrounded by the smoke exhaust channel for accommodating a fan and an impeller, the air inlet for the fan to extract smoke is located on one side of the front cover, the annular wall is provided with at least one protruding portion radially outward along the annular wall, and / or the wall surface of the annular wall close to the rear cover is provided with at least one bending plane inclined radially inward along the annular wall.

[0007] In this solution, the fan housing assembly changes the cross-sectional size of the ring wall at different positions along the smoke exhaust channel by setting an outward protrusion and / or an inward bending plane on the ring wall, forming a variable cross-sectional ring wall structure, which is beneficial to improving the flow field in the fan housing, reducing airflow impact, improving airflow stability, reducing noise, and providing users with a better user experience. Among them, when the ring wall adopts an outward protrusion design, the airflow space of the smoke exhaust channel is expanded, which is beneficial to reduce the airflow impact; when the ring wall adopts an inwardly inclined bending plane, the bending plane forms a cut angle of the ring wall, and the cut angle is set on the side of the rear cover opposite to the air inlet (located on the side of the front cover), that is, the cut angle and the air inlet are located on opposite sides, effectively reducing the impact force of the air inlet.

[0008] Preferably, the inclination angle of the bending plane relative to the surface of the back cover is not less than 20 degrees and not more than 30 degrees.

[0009] In this solution, the bending plane is set at the above-mentioned inclination angle, so that the bending plane can effectively reduce the impact of airflow, and the distance between the bending plane and the impeller inside the fan casing will not be too small, thereby avoiding airflow obstruction at this bending plane and causing noise.

[0010] Preferably, the fan housing is a volute in the shape of a snail shell, the annular wall includes a volute tongue located at the starting end of the smoke exhaust channel, an annular wall bottom relative to the volute tongue and an annular wall outlet located at the end of the smoke exhaust channel, and the bending plane is arranged at the bottom of the annular wall and / or between the bottom of the annular wall and the annular wall outlet.

[0011] In this solution, the fan housing adopts a volute in the shape of a snail shell, and the space of the smoke exhaust channel gradually increases from the inside to the outside, which is conducive to gradually reducing the pressure of the smoke exhaust airflow and reducing noise. The bending plane is set at the bottom of the ring wall and / or between the bottom of the ring wall and the ring wall outlet, that is, the cutting angle is located in the wider space area of ​​the smoke exhaust channel of the volute, so that the cutting angle will not affect the smoke flow in the narrower space area between the starting end of the smoke exhaust channel and the bottom of the ring wall, but reduce the expansion flow separation in the wider space area, reduce the airflow impact without causing obstruction, and reduce noise.

[0012] Preferably, the bending plane is arranged at the bottom of the annular wall; the fan housing assembly also includes a plurality of volute fixing brackets, which are arranged on the front cover and the rear cover and are respectively located between the volute tongue and the bottom of the annular wall and between the bottom of the annular wall and the annular wall outlet.

[0013] In this solution, the volute can be fixed to other components of the range hood by means of the plurality of volute fixing brackets provided as above, so as to form a stable structure.

[0014] Preferably, the front cover includes a first part and a second part sequentially connected from the starting end to the end of the smoke exhaust passage, and the rear cover includes a third part and a fourth part sequentially connected from the starting end to the end of the smoke exhaust passage;

[0015] Reinforcements are provided at corresponding positions of the first portion and the third portion, and the reinforcements are located near the volute fixing bracket.

[0016] In the present scheme, through the above-mentioned arrangement, the first part and the third part are the front cover and the rear cover of the volute close to the starting end along the smoke exhaust channel. By arranging reinforcement members in the first part and the third part, the plane distortion caused by the area difference from the first part of the front cover to the second part and from the third part of the rear cover to the fourth part can be effectively avoided, and at the same time, the overall strength of the volute at the volute fixing bracket is increased, so that the overall structural rigidity will not be affected by local fracture and deformation caused by the fixation of the volute fixing bracket.

[0017] Preferably, the width of the reinforcement gradually increases along the smoke exhaust direction from the starting end to the end of the smoke exhaust channel;

[0018] And / or, the reinforcement is spaced apart from the annular wall, and the reinforcement is spaced apart from the front cover and the rear cover at edges of the through hole.

[0019] In this solution, the width of the reinforcement gradually increases along the exhaust direction of the exhaust passage, which is consistent with the spatial change of the exhaust passage, which is conducive to reducing the plane distortion of the front cover and the rear cover. The reinforcement adopts the above-mentioned interval arrangement to ensure the profile depth and shape of the reinforcement, and effectively strengthen the strength of the volute.

[0020] Preferably, the bending plane is arranged at the bottom of the annular wall, and at least two oil leakage holes are arranged at the bottom of the annular wall along the thickness direction of the fan housing, and the two oil leakage holes are spaced apart relative to the geometric center of the annular wall, wherein the geometric center of the annular wall is the midpoint of a line connecting the center of the through hole located in the central area of ​​the front cover and the center of the through hole located in the central area of ​​the rear cover.

[0021] In the present solution, since the impeller is accommodated in the space area between the two through holes of the front cover and the rear cover along the axial direction of the fan casing, that is, located in the area where the geometric center of the annular wall is located, the two oil leakage holes set as above are not directly facing the effective air outlet area of ​​the impeller, which can increase the efficiency of oil leakage while stabilizing the airflow and will not generate abnormal noise.

[0022] Preferably, the fan housing is further provided with a plurality of flow guide components at the outlet of the fan housing, and the flow guide components are connected to the inner wall between the annular wall and the front cover or the rear cover.

[0023] In this solution, a flow guide component is provided at the outlet of the fan housing to ensure smooth discharge of the airflow; the flow guide component is connected to the inner wall between the annular wall and the front cover or the rear cover, so that the annular wall and the front cover or the rear cover form a transitional smooth flow guide surface at the outlet, thereby reducing the flow separation caused by the sudden change of the cross-section at the outlet, which is beneficial to the stability of the gas fluid and reduces noise.

[0024] Preferably, the bending plane is connected to the arcuate surface of the annular wall through a plurality of spaced-apart snap seals.

[0025] In this solution, the above arrangement is adopted, and the bending plane is snap-fastened to the arc surface of the annular wall, thereby achieving a high-strength connection and a sealed connection.

[0026] A range hood comprises the fan housing assembly as described above.

[0027] In this solution, the range hood changes the cross-sectional size of the annular wall at different positions along the smoke exhaust channel through the above-mentioned fan housing assembly, forming a variable cross-sectional annular wall structure, which is beneficial to improving the flow field in the fan housing, reducing airflow impact, improving airflow stability, reducing noise, and providing users with a better usage experience.

[0028] The positive progressive effect of the utility model is that the fan housing assembly and the range hood including the same change the cross-sectional size of the ring wall at different positions along the smoke exhaust channel by arranging an outward protrusion and / or an inward bending plane on the ring wall, thereby forming a ring wall structure with a variable cross-section, which is beneficial to improving the flow field in the fan housing, reducing airflow impact, improving airflow stability, reducing noise, and providing users with a better usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the fan housing assembly of Example 1 of the utility model (viewing angle 1).

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the fan housing assembly of Example 1 of the utility model (viewing angle 2).

[0031] Figure 3 It is a front view of the fan housing assembly of Example 1 of the utility model.

[0032] Figure 4 It is a rear view of the fan housing assembly of Example 1 of the utility model.

[0033] Figure 5 It is a side view of the fan housing assembly of Example 1 of the utility model.

[0034] Description of reference numerals:

[0035] Fan housing assembly 1

[0036] Fan housing 2

[0037] Front cover 3

[0038] Part 31

[0039] Part 232

[0040] Back cover 4

[0041] Part 341

[0042] Part 42

[0043] Reinforcement 5

[0044] Ring wall 6

[0045] Ring wall bottom 61

[0046] Ring wall outlet 62

[0047] Cochlear tongue 7

[0048] Smoke exhaust channel 8

[0049] The starting end of the smoke exhaust channel 81

[0050] End of smoke exhaust duct 82

[0051] Cavity 9 for fan and impeller

[0052] Air inlet for exhausting smoke from the fan 10

[0053] Bending plane 11

[0054] Guide component 12

[0055] Buckle 13

[0056] Volute fixing bracket 14

[0057] Oil leakage hole 15

[0058] Axial direction of fan housing A

[0059] Radial B of the fan housing DETAILED DESCRIPTION

[0060] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0061] Example 1

[0062] This embodiment provides a fan housing assembly 1, which is used to install a fan system of a hydraulic press.

[0063] The fan housing assembly 1 includes a fan housing 2, which includes a front cover 3, a rear cover 4 and an annular wall 6. The front cover 3 and the rear cover 4 are provided with through holes along the axial direction A of the fan housing 2. The two sides of the annular wall 6 connect the front cover 3 and the rear cover 4 to form a smoke exhaust channel 8. The fan housing 2 also includes a cavity 9 surrounded by the smoke exhaust channel 8 for accommodating a fan and an impeller. An air inlet 10 for the fan to extract smoke is located on one side of the front cover 3. The annular wall 6 is provided with at least one protruding portion radially outward along the annular wall 6, and / or the wall surface of the annular wall 6 close to the rear cover 4 is provided with at least one bending plane 11 inclined radially inwardly along the annular wall 6.

[0064] Specifically, Figure 1-5 As shown, in this embodiment, the fan housing 2 is a housing in the shape of a snail shell, called a volute, the front cover 3 and the rear cover 4 are two annular sheet metal parts, the front cover 3 and the rear cover 4 are provided with circular through holes along the axial direction A of the fan housing 2, the annular wall 6 is a sheet metal part that is like the back of a snail shell and is unfolded in an arc shape, the front cover 3 and the rear cover 4 are vertically connected to the two side edges of the annular wall 6 along the axial direction A of the fan housing 2, and the space enclosed by the front cover 3, the rear cover 4 and the annular wall 6 constitutes the exhaust channel 8 of the fan. Since the annular wall 6 is gradually unfolded in an arc shape from the starting end of the volute (corresponding to the starting end 81 of the exhaust channel) to the outlet end of the volute (corresponding to the end 82 of the exhaust channel), the annular space of the exhaust channel 8 is also gradually enlarged from the starting end to the outlet end. The central area of ​​the fan housing 2 surrounded by the exhaust channel 8 is a cavity 9 for accommodating the fan (not shown in the figure) and the impeller (not shown in the figure). Specifically, the fan is installed in the most central area, and the impeller is around the periphery of the fan. The impeller, the front cover 3, the rear cover 4 and the annular wall 6 form a closed exhaust channel 8. The air inlet 10 for the fan to extract smoke is arranged on one side of the front cover 3, and the wall surface of the annular wall 6 close to the rear cover 4 is provided with a bending plane 11 inclined inward along the radial direction B of the annular wall 6, that is, a cut angle of the annular wall 6 is formed. Here, "inward" tilting means that the bending plane 11 is inclined toward the exhaust channel 8 located inside. The exhaust airflow enters the interior of the volute between the front cover and the rear cover of the volute. Due to the high-speed operation of the impeller, it will quickly impact the impeller, causing the impeller to be dynamically unbalanced and then cause abnormal noise. By setting a cut angle on the annular wall, the airflow impact can be reduced, and the abnormal noise can be effectively reduced or eliminated.

[0065] In other embodiments, in order to mitigate the impact of the exhaust airflow on the annular wall 6, at least one protruding portion may be provided outwardly along the radial direction B on the annular wall 6, so that the airflow space of the exhaust channel 8 can be expanded, which is conducive to mitigating the impact of the airflow. Such an outwardly protruding design is more suitable for range hoods with sufficient internal space or low requirements for internal space. However, the internal space of the range hood is usually relatively compact, and the installation space of the fan system is relatively limited. However, in order to have a certain amount of space for the flow channel of the outlet section of the fan housing 2 and reduce the expansion flow separation near the outlet area, the inward cutting angle design of this embodiment is preferably adopted, which not only meets the requirements of compact internal space, but also reduces the impact of airflow, and the airflow in the flow channel will not be blocked to cause abnormal noise.

[0066] The fan housing assembly 1 changes the cross-sectional size of the ring wall 6 at different positions along the smoke exhaust passage by setting an outward protruding portion and / or an inward bending plane 11 on the ring wall 6, forming a ring wall 6 structure with a variable cross-section, which is beneficial to improving the flow field in the fan housing 2, reducing the impact of the airflow, improving the stability of the airflow, reducing noise, and providing users with a better use experience. Among them, when the ring wall 6 adopts the inwardly inclined bending plane 11, the bending plane 11 forms a cut angle of the ring wall 6, and the cut angle is set on the side of the rear cover 4 opposite to the air inlet 10 (located on the side of the front cover 3), that is, the cut angle and the air inlet are located on opposite sides, effectively reducing the impact force of the air inlet.

[0067] The inclination angle of the bending plane 11 relative to the surface of the rear cover 4 is not less than 20 degrees and not more than 30 degrees. With such an inclination angle setting, the bending plane can effectively reduce the impact of the airflow, and the distance between the bending plane 11 and the impeller inside the fan housing 2 will not be too small, so as to avoid the airflow being blocked at the bending plane and causing noise. According to experiments, when the bending plane 11 adopts different inclination angles, at the same fan speed, the comparison of its noise value is as follows:

[0068] Inclination angle of the bending plane 11 Noise level (dB) Less than 20 degrees 51.8 20-30 degrees 51.4-51.6 More than 30 degrees 51.8-52

[0069] It can be seen that the preferred design is for the bending plane 11 to have an inclination angle between 20 and 30 degrees.

[0070] Among them, Figure 1 and Figure 3 As shown, the annular wall 6 includes a volute tongue 7 at the starting end 81 of the smoke exhaust passage, an annular wall bottom 61 opposite to the volute tongue 7 and an annular wall outlet 62 at the end 82 of the smoke exhaust passage, and the bending plane 11 is provided at the annular wall bottom 61 .

[0071] The fan housing 2 adopts a volute in the shape of a snail shell, and the space of the smoke exhaust channel 8 gradually increases from the inside to the outside, which is conducive to gradually reducing the pressure of the smoke exhaust airflow and reducing noise. The bending plane 11 is set at the bottom 61 of the ring wall, that is, the cut angle is located in the wider space area of ​​the smoke exhaust channel 8 of the volute, so that the cut angle will not affect the smoke flow in the narrow space area between the starting end of the smoke exhaust channel 8 and the bottom 61 of the ring wall, but reduce the expansion flow separation in the wider space area, and reduce the airflow impact and noise without causing obstruction.

[0072] In other embodiments, according to the required effect, a plurality of bending planes 11 may be provided on the annular wall 6, that is, a plurality of cutting angles of the same or different sizes may be provided; the bending plane 11 may also be provided between the bottom 61 of the annular wall and the annular wall outlet 62, and this area is also a wider spatial area of ​​the smoke exhaust passage 8. Providing the bending plane 11 in this area will not cause airflow blockage, and can also slow down the impact of airflow and reduce noise.

[0073] Among them, Figure 1 As shown, the fan housing assembly 1 further includes a plurality of volute fixing brackets 14, which are arranged on the front cover 3 and the rear cover 4 and are respectively located between the volute tongue 7 and the annular wall bottom 61 and between the annular wall bottom 61 and the annular wall outlet 62. The volute fixing brackets 14 can fix the volute to other components of the range hood to form a stable structure.

[0074] The front cover 3 includes a first portion 31 (i.e. Figure 4 The right side portion of the middle front cover 3) and the second portion 32 (i.e. Figure 4 The left side portion of the front cover 3), the rear cover 4 includes a third portion 41 (i.e. Figure 3 The left side portion of the middle rear cover 4) and the fourth portion 42 (i.e. Figure 3 The first part 31 and the third part 41 are provided with a reinforcement member 5 at the corresponding positions. The reinforcement member 5 is specifically a stamped sheet metal structure, also known as a small stamping, and the reinforcement member 5 is located near the volute fixing bracket 14. By providing the reinforcement member 5 at the first part 31 and the third part 41, the plane distortion caused by the area difference of the transition from the left part of the front cover 3 to the right part and the transition from the left part of the rear cover 4 to the right part can be effectively avoided, and the overall strength of the volute at the volute fixing bracket 14 is increased, so that the local fracture and deformation caused by the fixing of the volute fixing bracket 14 will not affect the overall structural rigidity.

[0075] Among them, Figure 3As shown, the width of the reinforcement 5 gradually increases along the smoke exhaust direction from the starting end 81 to the end of the smoke exhaust channel, forming a triangular structure. Such a triangular corrugated sheet metal design is consistent with the spatial change of the smoke exhaust channel 8 (also consistent with the change in the shell width of the volute, from wide to narrow), which can effectively avoid plane distortion caused by the large difference in the transition area between the left and right sides of the volute, thereby improving the structural strength.

[0076] Among them, the reinforcement member 5 (small extrusion) is spaced apart from the annular wall 6. In this embodiment, a distance of 10 mm is reserved between the reinforcement member 5 and the annular wall 6; 20 mm is reserved between the reinforcement member 5 and the edges of the front cover 3 and the rear cover 4. Such an interval setting is adopted to ensure the extrusion depth and shape of the reinforcement member 5, thereby effectively enhancing the strength of the volute.

[0077] Among them, Figure 1 and Figure 5 As shown, the bottom 61 of the annular wall is provided with two oil leakage holes 15 along the thickness direction of the fan housing 2, and the two oil leakage holes 15 are arranged at intervals relative to the geometric center of the annular wall 6, wherein the geometric center of the annular wall 6 is the midpoint of the line connecting the center of the through hole located in the central area of ​​the front cover 3 and the center of the through hole located in the central area of ​​the rear cover 4. Since the impeller is accommodated in the space area between the two through holes in the axial direction of the fan housing 2 of the front cover 3 and the rear cover 4, that is, in the area where the geometric center of the annular wall 6 is located, the two oil leakage holes 15 arranged as above are not directly facing the effective air outlet area of ​​the impeller, which can increase the efficiency of oil leakage while stabilizing the airflow and not generating abnormal noise.

[0078] like Figure 2 As shown, the fan housing 2 is further provided with a plurality of guide components 12 at the outlet of the fan housing 2. The guide components 12 are connected to the inner wall between the annular wall 6 and the front cover 3 or the rear cover 4, so that the annular wall 6 and the front cover 3 or the rear cover 4 form a transitional smooth guide surface at the outlet, thereby reducing the flow separation caused by the sudden change of the cross-section at the outlet, so as to ensure the smooth discharge of the airflow through the guide components 12, and is beneficial to the stability of the gas fluid and reduces the noise.

[0079] like Figure 1 and Figure 3 As shown, the bending plane 11 is sealed and connected to the arc surface of the ring wall 6 by four spaced buckles 13, and the bending plane 11 is fixed to the arc surface of the ring wall 6 by the buckles 13, achieving a high-strength connection and a sealed connection. Among them, the spacing between the buckles 13 in this embodiment is between 45-50mm, so that the bending plane 11 has a suitable area, ensuring that the expansion flow separation can be effectively reduced. In other embodiments, according to the size of the bending plane 11, the number of buckles 13 set on its surface and the spacing between the buckles 13 can be adjusted accordingly as needed.

[0080] Example 2

[0081] The present embodiment provides a range hood, which includes a fan housing assembly 1 as in Embodiment 1. The range hood changes the cross-sectional size of the annular wall 6 at different positions along the smoke exhaust passage through the fan housing assembly 1, forming a variable cross-sectional annular wall structure, which is beneficial to improving the flow field in the fan housing 2, reducing the impact of the airflow, improving the stability of the airflow, reducing the noise, and providing users with a better use experience.

[0082] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A fan housing assembly, the fan housing assembly comprising a fan housing, the fan housing comprising a front cover, a rear cover and an annular wall, the front cover and the rear cover are provided with through holes along the axial direction of the fan housing, the two sides of the annular wall are connected to the front cover and the rear cover to form a smoke exhaust channel, the fan housing also includes a cavity surrounded by the smoke exhaust channel for accommodating a fan and an impeller, the air inlet for the fan to extract smoke is located on one side of the front cover, and the characteristics are as follows: The annular wall is provided with at least one protruding portion extending radially outward along the annular wall, and / or the wall surface of the annular wall close to the rear cover is provided with at least one bending plane inclined radially inwardly along the annular wall.

2. The fan housing assembly according to claim 1, characterized in that: The inclination angle of the bending plane relative to the surface of the back cover is not less than 20 degrees and not more than 30 degrees.

3. The fan housing assembly according to claim 1, characterized in that: The fan housing is a volute in the shape of a snail shell, and the annular wall includes a volute tongue located at the starting end of the smoke exhaust channel, an annular wall bottom relative to the volute tongue, and an annular wall outlet located at the end of the smoke exhaust channel. The bending plane is arranged at the bottom of the annular wall and / or between the bottom of the annular wall and the annular wall outlet.

4. The fan housing assembly according to claim 3, characterized in that: The bending plane is arranged at the bottom of the annular wall; the fan housing assembly also includes a plurality of volute fixing brackets, which are arranged on the front cover and the rear cover and are respectively located between the volute tongue and the bottom of the annular wall and between the bottom of the annular wall and the annular wall outlet.

5. The fan housing assembly according to claim 4, characterized in that: The front cover includes a first part and a second part which are sequentially connected from the starting end to the end of the smoke exhaust passage, and the rear cover includes a third part and a fourth part which are sequentially connected from the starting end to the end of the smoke exhaust passage; Reinforcements are provided at corresponding positions of the first portion and the third portion, and the reinforcements are located near the volute fixing bracket.

6. The fan housing assembly according to claim 5, characterized in that: The width of the reinforcement gradually increases along the smoke exhaust direction from the starting end to the end of the smoke exhaust channel; And / or, the reinforcement is spaced apart from the annular wall, and the reinforcement is spaced apart from the front cover and the rear cover at edges of the through hole.

7. The fan housing assembly according to claim 3, characterized in that: The bending plane is arranged at the bottom of the annular wall, and at least two oil leakage holes are arranged at the bottom of the annular wall along the thickness direction of the fan housing, and the two oil leakage holes are arranged at intervals relative to the geometric center of the annular wall, wherein the geometric center of the annular wall is the midpoint of a line connecting the center of the through hole located in the central area of ​​the front cover and the center of the through hole located in the central area of ​​the rear cover.

8. The fan housing assembly according to claim 1, characterized in that: The fan housing is further provided with a plurality of flow guide components at the outlet of the fan housing, and the flow guide components are connected to the inner wall between the annular wall and the front cover or the rear cover.

9. The fan housing assembly according to claim 1, characterized in that: The bending plane and the arc surface of the annular wall are sealed and connected via a plurality of buckles arranged at intervals.

10. A range hood, characterized in that: The range hood comprises a fan housing assembly as claimed in any one of claims 1 to 9.

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