A new type of air inlet ring guard, fan assembly and range hood

Abstract

The present invention discloses a novel air inlet ring guard, a fan assembly, and a range hood. The novel air inlet ring guard comprises: a fixed blade cascade, comprising a fixed inner ring with a center hole and a plurality of first guide vanes, the plurality of first guide vanes being evenly distributed circumferentially around the periphery of the fixed inner ring, the radial inner end of each first guide vane being fixedly connected to the fixed inner ring, and an outer air inlet channel being formed between adjacent first guide vanes; and a rotating blade cascade, rotatably disposed at the center hole and having a plurality of inner air inlet channels evenly distributed circumferentially, the rotating blade cascade rotating clockwise or counterclockwise under the impetus of airflow. The novel air inlet ring guard of the present invention has a certain degree of sound insulation, reflection, and noise reduction effects, further reducing noise, and effectively increasing the grease separation effect through the rotating blade cascade.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a novel air inlet ring guard, a fan assembly and a range hood. Background Art

[0002] Existing manufacturers are widely using DC motors instead of traditional AC motors, significantly increasing fan speeds to overcome flue network resistance. This noise problem is becoming increasingly prominent. How to further increase fan pressure and reduce noise while maintaining the same fan size has become a key research area for manufacturers.

[0003] When the range hood is running, negative pressure is formed at the inlet of the centrifugal fan, and air flows into the air inlet. Due to the particularity of the volute design, the circumferential negative pressure distribution of the air inlet is not the same, resulting in uneven air intake speed, which affects the fan performance to a certain extent. The traditional structural improvement is to add resistance parts or pre-swirl guide vanes to the air inlet, such as annular iron guards, honeycomb iron guards, pre-swirl guide vanes, etc., in order to make the air intake pressure of the air inlet more uniform or improve the airflow direction, so that the air intake direction is consistent with the impeller rotation direction, in order to improve aerodynamic noise. However, the dimension of sound field noise reduction is not considered, and the grease separation effect is very limited. Summary of the Invention

[0004] The present invention aims to solve, at least to a certain extent, one of the problems existing in the existing related technologies. To this end, the present invention proposes a new air inlet ring guard net, which has a simple structure and has a certain degree of sound insulation and reflection noise reduction effect, further reducing noise, and effectively increasing the grease separation effect through rotating blades.

[0005] The present invention further provides a fan assembly having the novel air inlet ring guard net. In addition, the present invention also provides a range hood having the fan assembly.

[0006] According to the above-mentioned novel air inlet ring guard, it is realized by the following technical solutions:

[0007] A novel air inlet ring guard net comprises: a fixed blade cascade, comprising a fixed inner ring with a center hole and a plurality of first guide vanes, wherein the plurality of first guide vanes are circumferentially spaced and evenly distributed around the periphery of the fixed inner ring, the radial inner end of each first guide vane is fixedly connected to the fixed inner ring, and an outer air inlet channel is formed between adjacent first guide vanes; and a rotating blade cascade, rotatably arranged at the center hole and having a plurality of inner air inlet channels that are circumferentially spaced and evenly distributed, wherein the rotating blade cascade rotates clockwise or counterclockwise under the push of the airflow.

[0008] In some embodiments, the rotating blade grid includes a center ring and a plurality of second guide vanes, wherein the plurality of second guide vanes are circumferentially spaced and evenly distributed around the periphery of the center ring, the radial inner end of each second guide vane is fixedly connected to the center ring, and an inner air inlet channel is formed between adjacent second guide vanes.

[0009] In some embodiments, the shapes of the first guide vane and the second guide vane are each composed of any one of a circular arc line, a Bezier curve, or a multi-segment curve.

[0010] In some embodiments, the airflow inlet angles of the first guide vane and the second guide vane are both 5° to 90°, and the airflow outlet angles of the first guide vane and the second guide vane are both 90° to 175°.

[0011] In some embodiments, the rotating blade cascade further includes a rotating outer ring, which is disposed between the central ring and the fixed inner ring, and a radial outer end of each second guide vane is fixedly connected to the rotating outer ring.

[0012] In some embodiments, the fixed blade cascade further includes a fixed outer ring, which is disposed on the periphery of the fixed inner ring, and the radial outer end of each first guide vane is fixedly connected to the fixed outer ring.

[0013] In some embodiments, the fixed blade cascade further includes a nozzle mounting port, which is disposed radially outside the fixed inner ring and passes through at least two adjacently arranged first guide vanes.

[0014] In some embodiments, a connection assembly is further included, and the rotating blade grid is rotatably connected to the fixed inner ring via the connection assembly.

[0015] In some embodiments, the connecting assembly includes a sleeve, a connecting shaft and a plurality of third guide vanes, the connecting shaft is arranged at a center position of the center hole, the plurality of third guide vanes are circumferentially spaced and evenly distributed between the connecting shaft and the fixed inner ring, the opposite ends of each of the third guide vanes are respectively fixedly connected to the fixed inner ring and the connecting shaft, and the rotating blade grid is rotatably connected to the connecting shaft through the sleeve; or, the sleeve is arranged at a center position of the center hole, the plurality of third guide vanes are circumferentially spaced and evenly distributed between the sleeve and the fixed inner ring, the opposite ends of each of the third guide vanes are respectively fixedly connected to the fixed inner ring and the sleeve, and the rotating blade grid is rotatably connected to the sleeve through the connecting shaft.

[0016] In some embodiments, the number of the third guide vanes is greater than or equal to three, and the shape of each of the third guide vanes is composed of any one of a circular arc, a Bezier curve, or a multi-segment curve.

[0017] In some embodiments, an airflow inlet angle of the third guide vane is 5° to 90°, and an airflow outlet angle of the third guide vane is 90° to 175°.

[0018] According to the above-mentioned novel air inlet ring guard, it is realized by the following technical solutions:

[0019] The fan assembly includes a wind cabinet, a driver and an impeller. The wind cabinet has an air inlet on its air inlet surface. The impeller is arranged in the wind cabinet and connected to the output end of the driver. It also includes a new type of air inlet ring guard net as described above. The new type of air inlet ring guard net is arranged at the air inlet, and the fixed blade grid is connected and fixed to the air inlet surface.

[0020] According to the range hood provided above, it is realized through the following technical solution: the range hood has the fan assembly as described above.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] 1. The novel air inlet ring guard of the present invention has a fixed cascade with multiple first guide vanes evenly spaced circumferentially. External air inlet channels are formed between adjacent first guide vanes. The rotating cascade has multiple inner air inlet channels evenly spaced circumferentially. When air flows through the outer or inner air inlet channels, it forms an intake airflow in the same direction as the first guide vanes or the second guide vanes in the rotating cascade, thereby improving intake conditions.

[0023] 2. By forming airflow inlets and outlets with specific inclination angles in both the outer and inner air intake channels, a certain degree of sound insulation and reflection noise reduction is achieved on the radiated sound field inside the fan assembly, further reducing noise;

[0024] 3. By rotatably setting the rotating blade at the center hole of the fixed blade, and using the air flow through the rotating blade to generate a pressure difference, the rotating blade is driven to rotate at high speed, and the grease separation of the oil smoke is achieved through centrifugal action. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an exploded view of a novel air inlet ring guard net in an embodiment of the present invention;

[0026] Figure 2 2. It is a structural diagram of a novel air inlet ring guard net in an embodiment of the present invention;

[0027] Figure 3 2. It is a cross-sectional view of a novel air inlet ring guard net according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the airflow direction of the first guide vane or the second guide vane in an embodiment of the present invention;

[0029] Figure 5 is an exploded view of a fan assembly according to an embodiment of the present invention;

[0030] Figure 6 Schematic diagram of the structure of the fan assembly in an embodiment of the present invention.

[0031] In the figure: 1-fixed cascade, 11-fixed inner ring, 111-center hole, 112-small notch, 12-first guide vane, 121-outer air inlet channel, 122-outer ring working surface, 13-fixed outer ring, 130-outer annular cavity, 131-mounting portion, 14-nozzle mounting port; 2-rotating cascade, 21-center ring, 210-center cavity, 22-second guide vane, 221-inner air inlet channel, 222-pre-rotation working surface, 23-rotating outer ring; 3-connecting assembly, 31-sleeve, 311-hook, 32-connecting shaft, 321-annular groove, 33-third guide vane;

[0032] 41-wind cabinet, 410-air inlet surface, 411-air inlet, 412-air outlet, 42-driver, 43-impeller, 431-blade, 44-nozzle structure, 441-nozzle, 45-air inlet ring, 451-mounting surface, 452-outer air guide surface, 453-inner air guide surface; 5-fastener. DETAILED DESCRIPTION

[0033] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0034] refer to Figure 1-2 This embodiment provides a novel air inlet ring guard for use with a range hood fan assembly. The novel air inlet ring guard comprises a fixed vane cascade 1, a rotating vane cascade 2, and a connecting assembly 3. The fixed vane cascade 1 includes a fixed inner ring 11 having a central hole 111 and a plurality of first guide vanes 12. The plurality of first guide vanes 12 are evenly spaced circumferentially around the outer periphery of the fixed inner ring 11. The radially inner end of each first guide vane 12 is fixedly connected to the fixed inner ring 11, and an external air inlet channel 121 is formed between adjacent first guide vanes 12. In this embodiment, each first guide vane 12 has an airflow inlet and outlet at a specific inclination angle, which enables the fixed vane 1 to have a pre-swirl function and aligns the airflow direction of the fixed vane 1 with the rotation direction of the first guide vanes 12. The external air inlet channel 121 also has an airflow inlet and outlet at a specific inclination angle, providing a certain degree of sound insulation and reflection noise reduction for the radiated sound field within the fan assembly.

[0035] The rotating blade cascade 2 is rotatably disposed at the center hole 111 and has multiple internal air inlet channels 221 evenly spaced circumferentially. These internal air inlet channels 221 also form airflow inlets and outlets at specific inclination angles, allowing the rotating blade cascade 2 to have a pre-swirl function, providing a certain degree of sound insulation and reflection noise reduction for the radiated sound field within the fan assembly. The rotating blade cascade 2 is rotatably connected to the fixed inner ring 11 via a connecting assembly 3, so that the rotating blade cascade 2 is securely mounted on the fixed inner ring 1 and can rotate relative to the fixed inner ring 1. The rotating blade cascade 2 rotates clockwise or counterclockwise under the influence of the airflow. This embodiment uses the clockwise rotation of the rotating blade cascade 2 under the influence of the airflow as an example.

[0036] When the fan assembly is operating, part of the airflow flows into the fan assembly through the external air inlet duct 121 of the fixed vane 1. After being guided by the first guide vanes 12, this airflow forms the same rotation direction as the first guide vanes 12. Another part of the airflow flows into the fan assembly through the internal air inlet duct 221 of the rotating vane 2. A pressure difference is created across the front and rear of the rotating vane 2, pushing the rotating vane 2 to rotate clockwise. The airflow then flows through the internal air inlet duct 221, forming the same rotation direction as the internal air inlet duct 221. The high-speed rotation of the rotating vane 2 separates the oil smoke from the oil.

[0037] refer to Figure 1-3 The fixed inner ring 11 is a circular ring structure, with its front face located forward of the highest point of each first guide vane 12. The front face of the first guide vane 12 gradually decreases in height from the radially inner side to the radially outer side. The shape of the first guide vane 12 is composed of any of a circular arc, a Bezier curve, or a multi-segment curve. This ensures that the first guide vane 12 and the fixed grille 1 have a pre-swirl function, thereby ensuring that the direction of the intake airflow through the outer air inlet passage 121 is consistent with the rotation direction of the first guide vane 12. This prevents increased blade inlet impact loss in the absence of pre-swirl, which could cause flow separation on the impeller suction surface, block the blade path, and reduce fan performance. The first guide vane 12 has an outer ring working surface 122 facing the outer air inlet passage 121. The cross-sectional shape of the outer ring working surface 122 in the fore-aft direction is composed of any of a circular arc, a Bezier curve, or a multi-segment curve. This embodiment uses the case where the cross-sectional shape of the outer ring working surface 122 in the fore-aft direction is composed of a circular arc as an example.

[0038] Optionally, the airflow inlet angle of the first guide vane 12 is 5° to 90°, and the airflow outlet angle of the first guide vane 12 is 90° to 175°. In this way, the cross-sectional size of the formed external air inlet channel 121 on the horizontal plane is different from front to back. Even if the airflow inlet angle and airflow outlet angle of the external air inlet channel 121 are different, it is ensured that a certain degree of sound insulation and reflection noise reduction can be achieved on the radiated sound field inside the fan assembly, thereby further reducing noise. Figure 4In this embodiment, the airflow inlet angle of the first guide vane 12 is the angle θ between the front end of the outer ring working surface 122 and the horizontal plane, and the airflow outlet angle of the first guide vane 12 is the angle β between the rear end of the outer ring working surface 122 and the horizontal plane.

[0039] refer to Figure 1-3 The fixed blade cascade 1 also includes a fixed outer ring 13, which is arranged on the periphery of the fixed inner ring 11. The radial outer end of each first guide vane 12 is fixedly connected to the fixed outer ring 13. In this way, the radial outer end of the first guide vane 12 is conveniently fixed by the fixed outer ring 13, thereby enhancing the overall strength of the fixed blade cascade 1. At the same time, it is also convenient to install the fixed blade cascade 1 on the fan assembly of the range hood through the fixed outer ring 13.

[0040] Optionally, the front of the fixed outer ring 13 is lower than the front of the fixed inner ring 11, and the fixed outer ring 13 has an outer ring cavity 130 opening toward the air outlet direction, that is, the fixed outer ring 13 has an outer ring cavity 130 opening toward the rear, and a plurality of mounting portions 131 are circumferentially spaced apart on the fixed outer ring 13, and each mounting portion 131 is used for detachably connecting the fan assembly to install the fixed blade 1 or the entire information air inlet ring guard net on the fan assembly.

[0041] refer to Figure 1-2 The fixed cascade 1 also includes a nozzle mounting opening 14, which is located radially outward of the fixed inner ring 11 and extends through at least two adjacent first guide vanes 12. This opening is used to allow the nozzle structure of the fan assembly to pass through, facilitating installation of the nozzle structure within the wind cabinet of the fan assembly. In this embodiment, all first guide vanes collectively constitute the first cascade assembly. The nozzle mounting opening 14 extends through portions of the first cascade assembly and the fixed outer ring 13, creating a large gap in the fixed cascade 1.

[0042] In order to avoid interference between the fixed inner ring 11 and the nozzle in the nozzle structure, a small gap 112 is provided at the rear side of the fixed inner ring 11 corresponding to the nozzle installation opening 14. The small gap 112 is used for the nozzle to pass through, thereby reserving installation space for the nozzle.

[0043] refer to Figure 1-3 The rotating blade cascade 2 includes a center ring 21 and a plurality of second guide vanes 22. The center ring 21 is rotatably connected to the inner ring 11 via a connecting assembly 3. The plurality of second guide vanes 22 are evenly spaced circumferentially around the center ring 21. The radially inner end of each second guide vane 22 is fixedly connected to the center ring 21. An inner air inlet channel 221 is formed between adjacent second guide vanes 22. After the airflow passes through the inner air inlet channel 221 of the rotating blade cascade 2, a pressure differential is formed before and after the second guide vanes 22, pushing the second guide vanes 22 to rotate clockwise. The airflow passing through the second guide vanes 22 rotates in the same direction as the second guide vanes 22. The high-speed rotation of the second guide vanes 22 separates the oil smoke from the oil.

[0044] In this embodiment, the center ring 21 has a central cavity 210 that opens toward the air outlet direction, that is, the center ring 21 has a central cavity 210 that opens toward the rear, and the side of the center cavity 210 facing the airflow is in the shape of a hemisphere, a crown sphere, a cone, a pyramid, a truncated cone, or a prism with a high middle and low edges, so that the center ring 21 plays a role in guiding the air flow, thereby facilitating the guidance of the intake airflow passing through it to the inner air intake channel 221.

[0045] The shape of the second guide vane 22 is composed of any one of a circular arc, a Bezier curve, or a multi-segment curve. This ensures that the second guide vane 22 and the rotating grille 2 have a pre-rotation function, thereby ensuring that the direction of the intake airflow flowing through the inner air inlet channel 221 is consistent with the rotation direction of the second guide vane 22, thereby avoiding the increase in blade inlet impact loss when there is no pre-rotation, causing flow separation on the impeller suction surface and blocking the blade path, thereby reducing fan performance. The second guide vane 22 has a pre-rotation working surface 222 facing the inner air inlet channel 221. The cross-sectional linear shape of the pre-rotation working surface 222 in the front-to-back direction is composed of any one of a circular arc, a Bezier curve, or a multi-segment curve. This embodiment takes the cross-sectional linear shape of the pre-rotation working surface 222 in the front-to-back direction as an example.

[0046] Optionally, the airflow inlet angle of the second guide vane 22 is 5° to 90°, and the airflow outlet angle of the second guide vane 22 is 90° to 175°. In this way, the cross-sectional size of the formed inner air intake channel 221 on the horizontal plane is different from front to back. Even if the airflow inlet angle and airflow outlet angle of the inner air intake channel 221 are different, it is ensured that a certain degree of sound insulation and reflection noise reduction can be achieved for the radiated sound field inside the fan assembly, thereby further reducing noise. Figure 4 In this embodiment, the air flow inlet angle of the second guide vane 22 is the angle θ between the front end of the pre-swirl working surface 222 and the horizontal plane, and the air flow outlet angle of the second guide vane 22 is the angle β between the rear end of the pre-swirl working surface 222 and the horizontal plane.

[0047] refer to Figure 1-3 The rotating cascade 2 also includes a rotating outer ring 23, which is positioned between the center ring 21 and the stationary inner ring 11. This ring is loosely fitted with the stationary inner ring 11 to prevent interference from the stationary inner ring 11 during clockwise rotation. The radially outer end of each second guide vane 22 is fixedly connected to the rotating outer ring 23. The rotating outer ring 23 thus secures the radially outer end of each second guide vane 22, enhancing the overall strength of the rotating cascade 2.

[0048] refer to Figure 1 and Figure 3The new air inlet ring guard net also includes a connecting component 3, and the rotating blade 2 is rotatably connected to the fixed inner ring 11 on the fixed blade 1 through the connecting component 3, so that the rotating blade 2 can be reliably installed at the center hole 111 of the fixed inner ring 11 through the connecting component 3, and ensure that the rotating blade 2 can rotate clockwise relative to the fixed blade 1.

[0049] The connecting assembly 3 includes a sleeve 31, a connecting shaft 32, and a plurality of third guide vanes 33. In this embodiment, the connecting shaft 32 is positioned at the center of the center hole 111. The plurality of third guide vanes 33 are evenly spaced circumferentially between the connecting shaft 32 and the fixed inner ring 11. The opposite ends of each third guide vane 33 are fixedly connected to the fixed inner ring 11 and the connecting shaft 32, respectively. In this way, the third guide vanes 33 serve as a fixing and reinforcement structure, securing the connecting shaft 32 and enhancing the overall strength of the novel air inlet shroud guard. The sleeve 31 is positioned within the central cavity 210 of the center ring 21. One end of the sleeve 31 is fixedly connected to the center of the center ring 21, and the other end is rotatably mounted on the connecting shaft 32, thereby rotatably connecting the rotating cascade 2 to the connecting shaft 32 via the sleeve 31.

[0050] In other embodiments, the installation positions of the sleeve 31 and the connecting shaft 32 can be interchanged, that is, the sleeve 31 is set at the center position of the center hole 111, and the plurality of third guide vanes 33 are evenly distributed circumferentially between the sleeve 31 and the fixed inner ring 11. The opposite ends of each third guide vane 33 are respectively fixedly connected to the fixed inner ring 11 and the sleeve 31, and the connecting shaft 32 is fixed on the center ring 21 of the rotating blade cascade 2. The rotating blade cascade 2 is rotatably connected to the sleeve 31 through the connecting shaft 32.

[0051] refer to Figure 3 Optionally, a positioning structure (not shown) is provided between the connecting shaft 32 and the sleeve 31 to prevent the rotating cascade blades 2 from separating from the fixed grille 1 during rotation. The positioning structure includes a hook 311 and an annular groove 321. The end of the connecting shaft 32 near the sleeve 31 is circumferentially provided with an annular groove 321 that is recessed toward the interior thereof. The sleeve 31 is fixed with at least two evenly spaced hooks 311, each hook 331 being connected to an annular groove or an annular flange. It should be noted that the annular groove 321 can be replaced with an annular flange. The end of the connecting shaft 32 near the sleeve 31 is circumferentially provided with an outwardly protruding annular flange, each hook being connected to the annular flange.

[0052] The number of third guide vanes 33 is greater than or equal to three, and the shape of each third guide vane 33 is formed by any of a circular arc, a Bezier curve, or a multi-segment curve, resulting in a tilted guide vane structure. This not only reduces the impact of the third guide vanes 33 on the airflow, but also further guides the pre-swirled airflow of the second guide vanes 22, allowing the airflow to enter the fan assembly after passing through the third guide vanes 33. This embodiment uses a circular arc as an example to define the airflow inlet and airflow inlet angle of the third guide vanes 33. The airflow inlet angle of the third guide vanes 33 ranges from 5° to 90°, and the airflow inlet angle of the third guide vanes 33 ranges from 90° to 175°.

[0053] refer to Figure 5-6 This embodiment further provides a fan assembly, which includes a wind cabinet 41, a driver 42, and an impeller 43. The wind cabinet 41 has a wind cabinet front plate forming an air inlet surface 410. An air inlet 411 is provided on the air inlet surface 410 of the wind cabinet 41, and an air outlet 412 is provided on the top of the wind cabinet 41. The impeller 43 is rotatably disposed in the wind cabinet 41 and connected to the output end of the driver 42. The fan assembly also includes a new type of air inlet ring guard net as described above, which is disposed at the air inlet 411. The fixed blade 1 is connected and fixed to the air inlet surface 410. In this embodiment, the fixed blade 1 is detachably connected to the air inlet surface 410 of the wind cabinet by fasteners 5 (such as screws).

[0054] It can be seen that by detachably installing a new air inlet ring guard at the air inlet 411, firstly, under the action of the first guide vane and the second guide vane, the direction of the intake air flow is consistent with the rotation direction of the guide vane, thereby improving the intake conditions and avoiding the increase in the impact loss at the blade entrance when there is no pre-rotation; secondly, the outer air inlet channel 121 and the inner air inlet channel 221 both form an air flow inlet and an air flow outlet with a specific inclination angle, which has a certain degree of sound insulation and reflection noise reduction effect on the radiation sound field inside the fan assembly, thereby further reducing the noise; thirdly, when the oil smoke flows through the new air inlet ring guard, part of the oil smoke will condense on the fixed ring 1 and the pre-rotation blades of the blade assembly 2, thereby helping to improve the grease separation effect; fourthly, the rotating blade 2 is rotatably arranged at the center hole of the fixed blade 1, and the pressure difference generated by the air flow through the rotating blade 2 is used to drive the rotating blade 2 to rotate at high speed, and the grease separation of the oil smoke is achieved through centrifugal action, while no additional power source is required, saving power.

[0055] The fan assembly also includes a nozzle structure 44, which is connected and fixed to the air inlet surface 410, and part of the nozzle structure 44 passes through the nozzle mounting port located on the fixed blade 1 and extends into the wind cabinet 41. In this way, it is ensured that the new air inlet ring guard net will not affect the assembly of the nozzle structure 44, and there is no need to add an additional nozzle structure 44 mounting port on the wind cabinet 41.

[0056] The air inlet assembly also includes an air inlet ring 45, which is disposed at the air inlet 411 and is clamped between the novel air inlet ring guard and the air inlet surface 410. In this embodiment, the air inlet ring 45 has a mounting surface 451, an outer air guide surface 452, and an inner air guide surface 453, all of which are annular structures. The outer air guide surface 452 is located between the mounting surface 451 and the inner air guide surface 453, and the mounting surface 451 is fixedly connected to the inner air guide surface 453 through the outer air guide surface 452.

[0057] During installation, the mounting surface 451 is clamped between the new air inlet ring guard net and the air inlet surface 410 of the wind cabinet 41, and fasteners 5 (such as screws) are used to pass through the mounting portion 141 of the new air inlet ring guard net and the mounting surface 451 of the air inlet ring 45 from front to back, and are fastened to the air inlet surface 410 of the wind cabinet 41; the rear end face of the outer ring wall of the outer ring cavity 130 presses the mounting surface 451 of the air inlet ring 45 tightly against the air inlet surface 410 of the wind cabinet 41, and the rear end face of the inner ring wall of the outer ring cavity 130 abuts against the outer air guide surface 452 of the air inlet ring 45, so that after the intake air flow passes through the outer air inlet channel 121 of the new air inlet ring guard net, part of it flows directly into the interior of the wind cabinet 41, and the other part is guided to the interior of the wind cabinet along the outer air guide surface 452 and the inner air guide surface 453 in turn.

[0058] This embodiment also provides a range hood, which has a fan assembly as described above. By arranging a new air inlet ring guard at the air inlet of the fan assembly, the new air inlet ring guard forms a first guide vane and a second guide vane at a specific angle, thereby improving the air intake conditions, having the effects of sound insulation and reflection noise reduction, further reducing noise, and at the same time facilitating the rotating blade grid to improve the grease separation effect and enhance the user experience.

[0059] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A range hood, comprising a fan assembly, the fan assembly comprising a wind cabinet (41), a driver (42) and an impeller (43), the air inlet surface (410) of the wind cabinet (41) being provided with an air inlet (411), the impeller (43) being arranged in the wind cabinet (41) and connected to the output end of the driver (42), characterized in that: It also includes an air inlet ring guard net, which is arranged at the air inlet (411) and includes: A fixed blade cascade (1), comprising a fixed inner ring (11) having a central hole (111) and a plurality of first guide vanes (12), wherein the plurality of first guide vanes (12) are uniformly distributed circumferentially around the outer periphery of the fixed inner ring (11), a radial inner end of each first guide vane (12) is fixedly connected to the fixed inner ring (11), an outer air inlet passage (121) is formed between adjacent first guide vanes (12), and the fixed blade cascade (1) is connected and fixed to the air inlet surface (410); and A rotating blade cascade (2) is rotatably disposed at the central hole (111) and has a plurality of inner air inlet channels (221) uniformly spaced circumferentially, wherein the rotating blade cascade (2) rotates clockwise or counterclockwise under the impetus of airflow; The rotating blade cascade (2) comprises a central ring (21) and a plurality of second guide vanes (22), wherein the plurality of second guide vanes (22) are circumferentially spaced and uniformly distributed around the periphery of the central ring (21), a radial inner end of each second guide vane (22) is fixedly connected to the central ring (21), and an inner air inlet channel (221) is formed between adjacent second guide vanes (22); The rotating blade cascade (2) further comprises a rotating outer ring (23), wherein the rotating outer ring (23) is arranged between the central ring (21) and the fixed inner ring (11), and the radial outer end of each second guide vane (22) is fixedly connected to the rotating outer ring (23); A connecting assembly (3), wherein the rotating blade grid (2) is rotationally connected to the fixed inner ring (11) via the connecting assembly (3).

2. The range hood according to claim 1, characterized in that: The shapes of the first guide vane (12) and the second guide vane (22) are both composed of any one of a circular arc, a Bezier curve or a multi-segment curve.

3. The range hood according to claim 2, characterized in that: The airflow inlet angles of the first guide vane (12) and the second guide vane (22) are both 5° to 90°, and the airflow outlet angles of the first guide vane (12) and the second guide vane (22) are both 90° to 175°.

4. The range hood according to claim 1, characterized in that: The fixed blade cascade (1) further comprises a fixed outer ring (13), the fixed outer ring (13) being arranged on the periphery of the fixed inner ring (11), and the radial outer end of each first guide vane (12) being fixedly connected to the fixed outer ring (13).

5. A range hood according to claim 1 or 4, characterized in that: The fixed blade cascade (1) further comprises a nozzle mounting opening (14), wherein the nozzle mounting opening (14) is arranged radially outside the fixed inner ring (11) and penetrates at least two adjacently arranged first guide vanes (12).

6. The range hood according to claim 1, characterized in that: The connecting assembly (3) comprises a shaft sleeve (31), a connecting shaft (32) and a plurality of third guide vanes (33), wherein the connecting shaft (32) is arranged at a central position of the central hole (111), and the plurality of third guide vanes (33) are uniformly distributed circumferentially between the connecting shaft (32) and the fixed inner ring (11), and opposite ends of each third guide vane (33) are respectively fixedly connected to the fixed inner ring (11) and the connecting shaft (32), and the rotating blade cascade (2) is rotatably connected to the connecting shaft (32) via the shaft sleeve (31); Alternatively, the shaft sleeve (31) is arranged at a central position of the central hole (111), a plurality of the third guide vanes (33) are uniformly distributed circumferentially between the shaft sleeve (31) and the fixed inner ring (11), opposite ends of each of the third guide vanes (33) are respectively fixedly connected to the fixed inner ring (11) and the shaft sleeve (31), and the rotating blade grid (2) is rotatably connected to the shaft sleeve (31) via the connecting shaft (32).

7. The range hood according to claim 6, characterized in that: The number of the third guide vanes (33) is greater than or equal to three, and the shape of each of the third guide vanes (33) is composed of any one of a circular arc, a Bezier curve, or a multi-segment curve.

8. The range hood according to claim 7, characterized in that: The airflow inlet angle of the third guide vane (33) is 5° to 90°, and the airflow outlet angle of the third guide vane (33) is 90° to 175°.

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