CN219176641U

CN219176641U - Novel inlet ring protective net, fan assembly and range hood

Info

Publication number: CN219176641U
Application number: CN202222878113.4U
Authority: CN
Inventors: 周伟峰; 叶剑; 林辉; 梁之博; 胡杨; 潘叶江
Original assignee: Vatti Co Ltd
Current assignee: Vatti Co Ltd
Priority date: 2022-10-31
Filing date: 2022-10-31
Publication date: 2023-06-13
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses a novel air inlet ring protective net, a fan assembly and a range hood, wherein the novel air inlet ring protective net comprises: the fixed blade grid comprises a fixed inner ring with a central hole and a plurality of first guide vanes, wherein the first guide vanes are circumferentially and uniformly distributed on the periphery of the fixed inner ring at intervals, the radial inner end of each first guide vane is fixedly connected with the fixed inner ring, and an outer air inlet channel is formed between every two adjacent first guide vanes; and the rotary blade cascade is rotatably arranged at the central hole and is provided with a plurality of inner air inlet channels which are uniformly distributed at intervals in the circumferential direction, and the rotary blade cascade rotates clockwise or anticlockwise under the pushing of air flow. The novel air inlet ring protective net has the effects of sound insulation and reflection noise reduction to a certain extent, further reduces noise, and effectively increases the grease separation effect by rotating the blade grid.

Description

Novel inlet ring protective net, fan assembly and range hood

Technical Field

The utility model relates to the technical field of range hoods, in particular to a novel air inlet ring protective net, a fan assembly and a range hood.

Background

The existing manufacturers widely use direct current motors to replace traditional alternating current motors, so that the rotating speed of a fan is greatly increased to overcome the resistance of a flue network, and the noise problem caused by the rotating speed is more and more prominent. How to further improve the pressure of the fan and reduce noise on the same fan size becomes the key direction of enterprise manufacturer research.

When the range hood operates, negative pressure is formed at the inlet of the air inlet ring of the centrifugal fan, and air flows into the air inlet ring. Due to the design specificity of the volute, the circumferential negative pressure distribution of the air inlet ring is not the same, so that the air inlet speed is uneven, and the performance of the fan is affected to a certain extent. The traditional structural improvement is that a resistance piece or a pre-rotation guide vane is added on an air inlet ring, such as an annular iron protection net, a honeycomb iron protection net, a pre-rotation guide vane and the like, so that the air inlet pressure of the air inlet ring is more uniform or the air flow direction is improved, and the air inlet air flow direction is consistent with the rotation direction of an impeller, so that the pneumatic noise is improved. But not from the sound field noise reduction dimension and the separation of grease is very limited.

Disclosure of Invention

The utility model aims to solve one of the problems existing in the prior related art at least to a certain extent, and therefore, the utility model provides the novel air inlet ring protective net which is simple in structure, has certain sound insulation and reflection noise reduction effects, further reduces noise, and effectively increases the grease separation effect by rotating the blade grid.

The utility model also provides a fan assembly with the novel air inlet ring protective net. In addition, the utility model also provides a range hood with the fan assembly.

According to the novel air inlet ring protection net provided by the utility model, the novel air inlet ring protection net is realized through the following technical scheme:

a novel air inlet ring protection net, which comprises: the fixed blade grid comprises a fixed inner ring with a central hole and a plurality of first guide vanes, wherein the first guide vanes are circumferentially and uniformly distributed on the periphery of the fixed inner ring at intervals, the radial inner end of each first guide vane is fixedly connected with the fixed inner ring, and an outer air inlet channel is formed between every two adjacent first guide vanes; and the rotary blade cascade is rotatably arranged at the central hole and is provided with a plurality of inner air inlet channels which are uniformly distributed at intervals in the circumferential direction, and the rotary blade cascade rotates clockwise or anticlockwise under the pushing of air flow.

In some embodiments, the rotary blade cascade comprises a central ring and a plurality of second guide vanes, the second guide vanes are circumferentially and uniformly distributed on the periphery of the central ring at intervals, the radial inner end of each second guide vane is fixedly connected with the central ring, and an inner air inlet channel is formed between every two adjacent second guide vanes.

In some embodiments, the shape of the first and second vanes are each composed of any one of a circular arc, a bezier curve, or a multi-segment curve.

In some embodiments, the gas flow inlet angles of the first and second vanes are each 5 ° to 90 °, and the gas flow outlet angles of the first and second vanes are each 90 ° to 175 °.

In some embodiments, the rotating cascade further comprises a rotating outer ring disposed between the center ring and the stationary inner ring, a radially outer end of each of the second vanes being fixedly connected to the rotating outer ring.

In some embodiments, the stationary blade cascade further comprises a stationary outer ring disposed at a periphery of the stationary inner ring, the radially outer end of each of the first guide vanes being fixedly connected to the stationary outer ring.

In some embodiments, the stationary blade cascade further comprises a nozzle mounting opening that is disposed radially outward of the stationary inner ring and that extends through at least two of the first vanes that are adjacently disposed.

In some embodiments, the rotary blade row is rotatably connected to the stationary inner ring by a connection assembly.

In some embodiments, the connecting assembly comprises a shaft sleeve, a connecting shaft and a plurality of third guide vanes, wherein the connecting shaft is arranged at the central position of the central hole, the plurality of third guide vanes are circumferentially and uniformly distributed between the connecting shaft and the fixed inner ring at intervals, the opposite ends of each third guide vane are respectively and fixedly connected with the fixed inner ring and the connecting shaft, and the rotary blade grid is rotationally connected with the connecting shaft through the shaft sleeve; or, the shaft sleeve is arranged at the central position of the central hole, a plurality of third guide vanes are circumferentially and uniformly distributed between the shaft sleeve and the fixed inner ring at intervals, the opposite ends of each third guide vane are respectively and fixedly connected with the fixed inner ring and the shaft sleeve, and the rotary blade grid is rotationally connected with the shaft sleeve through the connecting shaft.

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

In some embodiments, the third vane has a gas flow inlet angle of 5 ° to 90 °, and the third vane has a gas flow outlet angle of 90 ° to 175 °.

the fan assembly comprises a wind cabinet, a driver and an impeller, wherein an air inlet is formed in an air inlet surface of the wind cabinet, the impeller is arranged in the wind cabinet and connected with the output end of the driver, the fan assembly further comprises the novel wind inlet ring protection net, the novel wind inlet ring protection net is arranged at the air inlet, and the fixed blade grid is connected and fixed on the air inlet surface.

According to the above provided range hood, the following technical scheme is adopted: a range hood having a blower assembly as described above.

Compared with the prior art, the utility model at least comprises the following beneficial effects:

1. according to the novel air inlet ring protective net, the fixed blade grating is provided with the plurality of first guide vanes which are uniformly distributed at circumferential intervals, the outer air inlet channels are formed between the adjacent first guide vanes, the rotary blade grating is provided with the plurality of inner air inlet channels which are uniformly distributed at circumferential intervals, and when air flows through the outer air inlet channels or the inner air inlet channels, air inlet air flows which are consistent with the direction of the second guide vanes in the first guide vanes or the rotary blade grating are formed, so that air inlet conditions are improved;

2. the air inlet and the air outlet with the specific inclination angles are formed in the outer air inlet channel and the inner air inlet channel, so that the radiation sound field in the fan assembly has the effects of sound insulation, reflection and noise reduction to a certain extent, and noise is further reduced;

3. the rotary blade grating is rotatably arranged at the central hole of the fixed blade grating, and pressure difference is generated by utilizing air flow through the rotary blade grating to push the rotary blade grating to rotate at a high speed, and oil and fat separation for lifting oil smoke is realized through centrifugal effect.

Drawings

FIG. 1 is an exploded view of a novel air inlet ring protective net in an embodiment of the utility model;

FIG. 2 is a schematic structural view of a novel air inlet ring protection net according to an embodiment of the present utility model;

FIG. 3 is a cross-sectional view of a novel inlet air ring screen in an embodiment of the present utility model;

FIG. 4 is a schematic view of the direction of air flow of a first or second vane in an embodiment of the utility model;

FIG. 5 is an exploded view of a fan assembly in an embodiment of the present utility model;

fig. 6 is a schematic diagram of a fan assembly in an embodiment of the present utility model.

In the figure: 1-fixed blade grids, 11-fixed inner rings, 111-central holes, 112-small gaps, 12-first guide vanes, 121-outer air inlet channels, 122-outer ring working surfaces, 13-fixed outer rings, 130-outer ring cavities, 131-mounting parts and 14-nozzle mounting openings; 2-rotating blade grids, 21-central rings, 210-central cavities, 22-second guide vanes, 221-inner air inlet channels, 222-pre-rotating working surfaces and 23-rotating outer rings; 3-connecting components, 31-shaft sleeves, 311-hooks, 32-connecting shafts, 321-annular grooves and 33-third guide vanes;

41-wind cabinet, 410-wind inlet face, 411-wind inlet, 412-wind outlet, 42-driver, 43-impeller, 431-blade, 44-nozzle structure, 441-jet pipe, 45-wind inlet ring, 451-mounting face, 452-outer wind guiding face, 453-inner wind guiding face; 5-fasteners.

Detailed Description

The following examples illustrate the utility model, but the utility model is not limited to these examples. Modifications and equivalents of some of the technical features of the specific embodiments of the present utility model may be made without departing from the spirit of the present utility model, and they are all included in the scope of the claimed utility model.

Referring to fig. 1-2, the present embodiment provides a novel air inlet ring protection net, which is applied to a fan assembly of a range hood, and the novel air inlet ring protection net comprises a fixed blade grid 1, a rotary blade grid 2 and a connecting assembly 3, wherein the fixed blade grid 1 comprises a fixed inner ring 11 with a central hole 111 and a plurality of first guide vanes 12, the plurality of first guide vanes 12 are circumferentially and uniformly distributed at the periphery of the fixed inner ring 11 at intervals, the radially inner end of each first guide vane 12 is fixedly connected with the fixed inner ring 11, and an outer air inlet channel 121 is formed between adjacent first guide vanes 12. In the present embodiment, each first vane 12 is formed with an air flow inlet and an air flow outlet at a specific inclination angle so that the stationary blade cascade 1 has a pre-rotation function, and the inlet air flow direction of the stationary blade cascade 1 is made to coincide with the rotation direction of the first vane 12; the outer air inlet passage 121 is also formed with an air inlet and an air outlet at a specific inclination angle, and has a certain degree of sound insulation and reflection noise reduction effects on the radiation sound field inside the fan assembly.

The rotary blade cascade 2 is rotatably arranged at the central hole 111, and is provided with a plurality of inner air inlet channels 221 which are uniformly distributed at intervals in the circumferential direction, and the inner air inlet channels 221 are also formed with an air flow inlet and an air flow outlet with specific inclination angles, so that the rotary blade cascade 2 also has a pre-rotation function, and has a certain sound insulation and reflection noise reduction effect on the radiation sound field inside the fan assembly. The rotary blade cascade 2 is rotatably connected with the fixed inner ring 11 through the connecting component 3, so that the rotary blade cascade 2 is reliably mounted on the fixed inner ring 1 and can rotate relative to the fixed inner ring 1, the rotary blade cascade 2 rotates clockwise or anticlockwise under the pushing of the air flow, and the rotary blade cascade 2 rotates clockwise under the pushing of the air flow in the embodiment.

When the fan assembly is in operation, a portion of the air flow flows from the outer air inlet channel 121 of the stationary blade row 1 into the air inlet assembly, which portion of the air flow, after being guided through the first guide vanes 12, forms the same rotational direction as the first guide vanes 12. After the other part of the air flows into the air inlet unit from the inner air inlet channel 221 of the rotary blade cascade 2, a pressure difference is formed in the front and back of the rotary blade cascade 2, the rotary blade cascade 2 is pushed to rotate clockwise, and the air flows through the inner air inlet channel 221 to form the same rotation direction as the inner air inlet channel 221. Oil and grease separation is realized after the oil fume rotates at a high speed through the rotary blade grating 2.

Referring to fig. 1 to 3, the stationary inner ring 11 has a circular ring structure with a front surface located at a front side of a highest point of each first guide vane 12. The front surface of the first guide vane 12 gradually becomes lower from the radial inner side to the radial outer side, and the shape of the first guide vane 12 is formed by any one of an arc line, a Bezier curve or a multi-section curve, so that the first guide vane 12 and the fixed grid 1 are ensured to have a pre-rotation function, and further the inlet air flow direction flowing through the outer air inlet channel 121 is ensured to be consistent with the rotation direction of the first guide vane 12, thereby avoiding the increase of the impact loss of the blade inlet when no pre-rotation exists, leading the suction surface of the impeller to generate a flow separation, blocking the blade path and reducing the performance of the fan. The first guide vane 12 has an outer ring working surface 122 facing the outer intake passage 121, and a sectional line shape of the outer ring working surface 122 in the front-rear direction is composed of any one of a circular arc line, a bezier curve, or a multi-segment curve. In this embodiment, the cross-sectional line shape of the outer ring working surface 122 in the front-rear direction is exemplified by a circular arc line.

Optionally, the angles of the air inflow openings of the first guide vanes 12 are 5 ° to 90 °, and the angles of the air outflow openings of the first guide vanes 12 are 90 ° to 175 °, so that the cross sections of the formed outer air inlet channels 121 on the horizontal plane are different from front to back, and even if the angles of the air inflow openings and the air outflow openings of the outer air inlet channels 121 are different, the sound insulation and reflection noise reduction effects on the radiation sound field inside the fan assembly are ensured to a certain extent, and noise is further reduced. Referring to fig. 4, in the present embodiment, the air inflow opening angle of the first guide vane 12 is an included angle θ between the front end of the outer ring working surface 122 and the horizontal plane, and the air outflow opening angle of the first guide vane 12 is an included angle β between the rear end of the outer ring working surface 122 and the horizontal plane.

Referring to fig. 1-3, the fixed blade cascade 1 further includes a fixed outer ring 13, the fixed outer ring 13 is disposed at the periphery of the fixed inner ring 11, and the radially outer end of each first guide vane 12 is fixedly connected with the fixed outer ring 13, so that the radially outer end of the first guide vane 12 is convenient to fix through the fixed outer ring 13, the overall strength of the fixed blade cascade 1 is enhanced, and meanwhile, the fixed blade cascade 1 is convenient to install on a fan assembly of a range hood through the fixed outer ring 13.

Optionally, the front surface of the fixed outer ring 13 is lower than the front surface 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 arranged on the fixed outer ring 13 at intervals, and each mounting portion 131 is used for detachably connecting a fan assembly to mount the fixed blade grid 1 or the whole information air inlet ring protection net on the fan assembly.

Referring to fig. 1-2, the stationary blade cascade 1 further comprises a nozzle mounting opening 14, the nozzle mounting opening 14 being arranged radially outside the stationary inner ring 11 and penetrating at least two first guide vanes 12 arranged adjacently, the nozzle mounting opening 14 being for the passage of a nozzle structure on the fan assembly for facilitating the mounting of a part of the nozzle structure inside a wind cabinet on the fan assembly. In this embodiment, all the first guide vanes together constitute the first cascade assembly, and the nozzle mounting openings 14 penetrate through portions of the first cascade assembly and portions of the stationary outer ring 13, respectively, so that the stationary grid 1 is formed with a large notch.

In order to avoid interference between the fixed inner ring 11 and the nozzle in the nozzle structure, a small notch 112 is provided at a position corresponding to the nozzle mounting opening 14 at the rear side of the fixed inner ring 11, and the small notch 112 is used for the nozzle to pass through so as to reserve a mounting space for the nozzle.

Referring to fig. 1-3, the rotary blade cascade 2 includes a central ring 21 and a plurality of second guide vanes 22, the central ring 21 is rotationally connected with the fixed inner ring 11 through the connecting assembly 3, the plurality of second guide vanes 22 are circumferentially and uniformly distributed at intervals on the periphery of the central ring 21, the radially inner end of each second guide vane 22 is fixedly connected with the central ring 21, and an inner air inlet channel 221 is formed between adjacent second guide vanes 22. After the air flow passes through the inner air inlet channel 221 of the rotary blade cascade 2, a pressure difference is formed before and after the second guide vane 22, the second guide vane 22 is pushed to rotate clockwise, and the air flow passes through the second guide vane 22 to form the same rotation direction as the second guide vane 22. The oil and grease separation is realized after the oil fume rotates at a high speed through the second guide vane 22.

In this embodiment, the center ring 21 has a center cavity 210 that is open toward the air outlet direction, i.e., the center ring 21 has a center cavity 210 that is open toward the rear, and the side of the center cavity 210 facing the air flow is in any one of a hemispherical shape with high middle and low edges, a crown shape, a conical shape, a pyramid shape, a truncated cone shape, and a truncated pyramid shape, so that the center ring 21 functions as an air guide, and is convenient for guiding the air flow of the intake air flowing through it to the inner air intake channel 221.

The shape of the second guide vane 22 is composed of any one of an arc line, a Bezier curve or a multi-section curve, so that the second guide vane 22 and the rotary grating 2 are ensured to have a pre-rotation function, and further the inlet air flow direction flowing through the inner air inlet channel 221 is ensured to be consistent with the rotation direction of the second guide vane 22, thereby avoiding the increase of the impact loss of the blade inlet when no pre-rotation exists, leading the suction surface of the impeller to generate flow separation, blocking the blade path and reducing the performance of the fan. The second guide vane 22 has a pre-rotation working surface 222 facing the inner intake passage 221, and a cross-sectional line shape of the pre-rotation working surface 222 in the front-rear direction is composed of any one of a circular arc line, a bezier curve, or a multi-segment curve. In the present embodiment, the cross-sectional line shape of the pre-rotation surface 222 in the front-rear direction is exemplified by a circular arc line.

Optionally, the air inlet angles of the second guide vanes 22 are all 5-90 degrees, and the air outlet angles of the second guide vanes 22 are all 90-175 degrees, so that the cross section of the formed inner air inlet channel 221 on the horizontal plane is different from front to back, even if the air inlet angles and the air outlet angles of the inner air inlet channel 221 are different, the radiation sound field inside the fan assembly can be ensured to have certain sound insulation and reflection noise reduction effects, and noise is further reduced. Referring to fig. 4, in the present embodiment, the air inlet angle of the second guide vane 22 is an included angle θ between the front end of the pre-rotation face 222 and the horizontal plane, and the air outlet angle of the second guide vane 22 is an included angle β between the rear end of the pre-rotation face 222 and the horizontal plane.

Referring to fig. 1 to 3, the rotary blade cascade 2 further includes a rotary outer ring 23, the rotary outer ring 23 being disposed between the center ring 21 and the fixed inner ring 11, and the rotary outer ring 23 being in clearance fit with the fixed inner ring 11 to avoid interference of the rotary outer ring 23 by the fixed inner ring 11 upon clockwise rotation. The radially outer end of each second vane 22 is fixedly connected to a rotating outer ring 23. Thus, by rotating the outer ring 23, the radially outer ends of the second guide vanes 22 are facilitated to be fixed, and the overall strength of the rotary blade cascade 2 is enhanced.

Referring to fig. 1 and 3, the novel air inlet ring protection net further comprises a connecting component 3, the rotary blade grid 2 is rotationally connected with the fixed inner ring 11 on the fixed blade grid 1 through the connecting component 3, so that the rotary blade grid 2 is reliably installed at the central hole 111 of the fixed inner ring 11 through the connecting component 3, and the rotary blade grid 2 is guaranteed to rotate clockwise relative to the fixed blade grid 1.

The coupling assembling 3 includes axle sleeve 31, connecting axle 32 and a plurality of third guide vane 33, in this embodiment, connecting axle 32 sets up in the central point of centre bore 111 put, and a plurality of third guide vane 33 circumference interval equipartition is between connecting axle 32 and fixed inner circle 11, and the fixed inner circle 11 of relative both ends of every third guide vane 33 fixed connection respectively and connecting axle 32, like this, third guide vane 33 can regard as fixed, additional strengthening for fixed connecting axle 32, strengthen the bulk strength of novel inlet air ring protective net. The shaft sleeve 31 is disposed in the central cavity 210 of the central ring 21, one end of the shaft sleeve 31 is fixedly connected to the central position of the central ring 21, and the other end is rotatably sleeved on the connecting shaft 32, so that the rotary blade grid 2 is rotatably connected with the connecting shaft 32 through the shaft sleeve 31.

In other embodiments, the mounting positions of the shaft sleeve 31 and the connecting shaft 32 may be interchanged, that is, the shaft sleeve 31 is disposed at the central position of the central hole 111, the plurality of third guide vanes 33 are circumferentially and uniformly distributed between the shaft sleeve 31 and the fixed inner ring 11, opposite ends of each third guide vane 33 are respectively and fixedly connected with the fixed inner ring 11 and the shaft sleeve 31, the connecting shaft 32 is fixed on the central ring 21 of the rotary blade cascade 2, and the rotary blade cascade 2 is rotationally connected with the shaft sleeve 31 through the connecting shaft 32.

Referring to fig. 3, a positioning structure (not shown) is optionally provided between the connection shaft 32 and the boss 31 to prevent the rotary blade cascade 2 from being separated from the stationary grill 1 when rotated. The positioning structure comprises a clamping hook 311 and an annular groove 321, the connecting shaft 32 is circumferentially provided with the annular groove 321 which is sunken towards the inside of the connecting shaft 32, the shaft sleeve 31 is fixedly provided with at least two clamping hooks 311 which are uniformly distributed at intervals, and each clamping hook 331 is hooked with the annular groove or the annular flange. In particular, the annular groove 321 may be replaced by an annular flange, and an end of the connecting shaft 32 near the shaft sleeve 31 is circumferentially provided with an annular flange protruding outwards, and each hook is hooked with the annular flange.

The number of the third guide vanes 33 is greater than or equal to three, and the shape of each third guide vane 33 is composed of any one of an arc line, a Bezier curve or a multi-section curve, so that the third guide vanes 33 are of an inclined guide vane structure, and therefore the influence of the third guide vanes 33 on the air flow is reduced, and the pre-swirl air flow of the second guide vanes 22 is further led, so that the air flow enters the fan assembly after passing through the third guide vanes 33. The present embodiment defines the airflow inlet and the airflow inlet angle of the third vane 33 by taking an arc as an example. The gas inflow opening angle of the third guide vane 33 is 5 ° to 90 °, and the gas inflow opening angle of the third guide vane 33 is 90 ° to 175 °.

Referring to fig. 5-6, the present embodiment further provides a fan assembly, where the fan assembly 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. An impeller 43 is rotatably disposed within the cabinet 41 and is coupled to the output of the driver 42. The fan assembly further comprises a novel air inlet ring protection net, the novel air inlet ring protection net is arranged at the air inlet 411, the fixed blade grid 1 is fixedly connected to the air inlet surface 410, and in the embodiment, the fixed blade grid 1 is detachably connected to the air inlet surface 410 of the air cabinet through a fastener 5 (such as a screw).

Therefore, through the fact that the novel air inlet ring protective net is detachably arranged at the air inlet 411, under the action of the first guide vane and the second guide vane, the air inlet flow direction is consistent with the rotation direction of the guide vane, the air inlet condition is improved, and the increase of the impact loss of the blade inlet when no pre-rotation exists is avoided; the second outer air inlet channel 121 and the inner air inlet channel 221 are respectively provided with an air inlet and an air outlet with specific inclination angles, so that the radiation sound field in the fan assembly is subjected to sound insulation, reflection and noise reduction to a certain extent, and noise is further reduced; thirdly, when the oil fume flows through the novel air inlet ring protective net, part of the oil fume can be condensed on the fixed ring 1 and the pre-rotation She Shan of the blade grid assembly 2, so that the oil and fat separation effect is improved; the fourth rotating blade grating 2 is rotatably arranged at the center hole of the fixed blade grating 1, pressure difference is generated by utilizing air flow through the rotating blade grating 2, the rotating blade grating 2 is pushed to rotate at a high speed, oil separation for lifting oil smoke is realized through centrifugal effect, meanwhile, no power source is needed to be additionally provided, and a power supply is saved.

The fan assembly further comprises a nozzle structure 44, the nozzle structure 44 is fixedly connected to the air inlet surface 410, and part of the nozzle structure 44 penetrates through the nozzle mounting opening in the fixed blade grid 1 to extend into the air cabinet 41, so that the novel air inlet ring protection net is ensured not to influence the assembly of the nozzle structure 44, and the additional arrangement of the nozzle structure 44 mounting opening on the air cabinet 41 is not needed.

The air inlet assembly further comprises an air inlet ring 45, wherein the air inlet ring 45 is arranged at the air inlet 411 and is clamped between the novel air inlet ring protective net and the air inlet surface 410. In this embodiment, the air intake ring 45 has a mounting surface 451, an outer air guiding surface 452 and an inner air guiding surface 453, each of which has a ring-shaped structure, the outer air guiding surface 452 is located between the mounting surface 451 and the inner air guiding surface 453, and the mounting surface 451 is fixedly connected to the inner air guiding surface 453 through the outer air guiding surface 452.

When in installation, the installation surface 451 is clamped between the novel air inlet ring protective net and the air inlet surface 410 of the air cabinet 41, and the installation part 141 of the novel air inlet ring protective net and the installation surface 451 of the air inlet ring 45 are sequentially penetrated from front to back by adopting a fastener 5 (such as a screw) and are in fastening connection with the air inlet surface 410 of the air cabinet 41; the rear end face of the outer annular wall of the outer annular cavity 130 presses the mounting face 451 of the air inlet ring 45 against the air inlet face 410 of the air cabinet 41, and the rear end face of the inner annular wall of the outer annular cavity 130 abuts against the outer air guide face 452 of the air inlet ring 45, so that after the inlet air flows through the outer air inlet channel 121 of the novel air inlet ring protection net, part of the inlet air directly flows into the air cabinet 41, and the other part of the inlet air flows into the air cabinet along the outer air guide face 452 and the inner air guide face 453 in sequence.

The embodiment also provides a range hood, this range hood has the fan subassembly as above, through set up novel inlet air ring protective net in fan subassembly's air intake department, novel inlet air ring protective net forms specific angle's first stator and second stator, improves the condition of admitting air, has sound insulation and reflection and falls the effect of making an uproar, further reduces the noise, does benefit to rotatory cascade simultaneously and promotes grease separation effect, promotes user's use experience.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims

1. Novel inlet air ring protective net, characterized by includes:

the fixed blade grid (1) comprises a fixed inner ring (11) with a central hole (111) and a plurality of first guide vanes (12), wherein the plurality of first guide vanes (12) are circumferentially and uniformly distributed at intervals on the periphery of the fixed inner ring (11), the radial inner end of each first guide vane (12) is fixedly connected with the fixed inner ring (11), and an outer air inlet channel (121) is formed between every two adjacent first guide vanes (12); and

the rotary blade grid (2) is rotatably arranged at the central hole (111) and is provided with a plurality of inner air inlet channels (221) which are uniformly distributed at circumferential intervals, and the rotary blade grid (2) rotates clockwise or anticlockwise under the pushing of air flow.

2. The novel air inlet ring protection net according to claim 1, wherein the rotary blade grid (2) comprises a central ring (21) and a plurality of second guide vanes (22), the second guide vanes (22) are circumferentially and uniformly distributed on the periphery of the central ring (21), the radial inner end of each second guide vane (22) is fixedly connected with the central ring (21), and an inner air inlet channel (221) is formed between every two adjacent second guide vanes (22).

3. A novel air inlet ring protection net according to claim 1 or 2, characterized in that the shape of the first guide vane (12) and the second guide vane (22) is composed of any one of circular arc line, bezier curve or multi-section curve.

4. A novel air inlet ring protection net according to claim 3, wherein the air inlet angles of the first guide vane (12) and the second guide vane (22) are 5-90 degrees, and the air outlet angles of the first guide vane (12) and the second guide vane (22) are 90-175 degrees.

5. The novel air inlet ring protection net according to claim 2, wherein the rotary blade grid (2) further comprises a rotary outer ring (23), the rotary 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 with the rotary outer ring (23).

6. The novel air inlet ring protection net according to claim 1, wherein the fixed blade grid (1) further comprises a fixed outer ring (13), the fixed outer ring (13) is arranged on the periphery of the fixed inner ring (11), and the radial outer end of each first guide vane (12) is fixedly connected with the fixed outer ring (13).

7. A new type of intake grommet protection net according to claim 1 or 6, characterized in that the stationary blade row (1) further comprises nozzle mounting openings (14), which nozzle mounting openings (14) are arranged radially outside the stationary inner ring (11) and which extend through at least two of the first guide vanes (12) arranged adjacently.

8. A novel air inlet ring protection net according to claim 1, further comprising a connecting component (3), wherein the rotary blade grid (2) is rotationally connected with the fixed inner ring (11) through the connecting component (3).

9. The novel air inlet ring protection net according to claim 8, wherein the connecting assembly (3) comprises a shaft sleeve (31), a connecting shaft (32) and a plurality of third guide vanes (33), the connecting shaft (32) is arranged at the central position of the central hole (111), the plurality of third guide vanes (33) are circumferentially and uniformly distributed between the connecting shaft (32) and the fixed inner ring (11) at intervals, opposite ends of each third guide vane (33) are respectively and fixedly connected with the fixed inner ring (11) and the connecting shaft (32), and the rotary blade grid (2) is rotationally connected with the connecting shaft (32) through the shaft sleeve (31);

or, the shaft sleeve (31) is arranged at the central position of the central hole (111), a plurality of third guide vanes (33) are circumferentially and uniformly distributed between the shaft sleeve (31) and the fixed inner ring (11), the opposite ends of each third guide vane (33) are respectively and fixedly connected with the fixed inner ring (11) and the shaft sleeve (31), and the rotary blade grid (2) is rotationally connected with the shaft sleeve (31) through the connecting shaft (32).

10. The novel air inlet ring protection net according to claim 9, wherein the number of the third guide vanes (33) is greater than or equal to three, and the shape of each third guide vane (33) is composed of any one of a circular arc line, a bezier curve or a multi-section curve.

11. The novel air inlet ring protection net according to claim 10, wherein the air inlet angle of the third guide vane (33) is 5-90 degrees, and the air outlet angle of the third guide vane (33) is 90-175 degrees.

12. Fan subassembly, including wind cabinet (41), driver (42) and impeller (43), air inlet face (410) of wind cabinet (41) are equipped with air intake (411), impeller (43) set up in wind cabinet (41) and connect the output of driver (42), a serial communication port, still include a novel inlet ring protective net according to any one of claims 1-11, novel inlet ring protective net set up in air intake (411) department, fixed blade bars (1) connect and fix on air inlet face (410).

13. A range hood having a fan assembly as claimed in claim 12.