CN219197715U

CN219197715U - Air inlet ring protective net, fan assembly and range hood

Info

Publication number: CN219197715U
Application number: CN202222878147.3U
Authority: CN
Inventors: 周伟峰; 林辉; 叶剑; 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: 2023-06-16
Anticipated expiration: 2032-10-31

Abstract

The utility model discloses an air inlet ring protective net, a fan assembly and a range hood, wherein the air inlet ring protective net comprises: the fixing ring comprises a center ring and an outer ring, and the outer ring is coaxially arranged at the periphery of the center ring; the blade grid assembly comprises a plurality of first pre-rotation blade grids, wherein the plurality of first pre-rotation blade grids are circumferentially and uniformly distributed between the central ring and the outer ring at intervals, the radial inner end and the radial outer end of each first pre-rotation blade grid are respectively and fixedly connected with the central ring and the outer ring, and an airflow channel is formed between the adjacent first pre-rotation blade grids; and the mounting port penetrates through part of the blade grid assembly or penetrates through part of the blade grid assembly and the outer ring respectively. The air inlet ring protective net has a simple structure, and the air inlet ring protective net has a pre-rotation function by forming the pre-rotation blade grating with a specific angle, so that the air inlet condition is improved, and meanwhile, the air inlet ring protective net has the effects of sound insulation, reflection and noise reduction to a certain extent, so that the noise is further reduced.

Description

Air 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 an 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 in the prior art to at least a certain extent, and therefore, the utility model provides the air inlet ring protective net which is simple in structure, has a pre-rotation function by forming a pre-rotation blade grid with a specific angle, improves air inlet conditions, has certain sound insulation and reflection noise reduction effects, and further reduces noise.

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

According to the air inlet ring protective net, the air inlet ring protective net is realized through the following technical scheme:

an air intake grommet protective netting comprising: the fixing ring comprises a center ring and an outer ring, and the outer ring is coaxially arranged at the periphery of the center ring; the blade grid assembly comprises a plurality of first pre-rotation blade grids, wherein the plurality of first pre-rotation blade grids are circumferentially and uniformly distributed between the central ring and the outer ring at intervals, the radial inner end and the radial outer end of each first pre-rotation blade grid are respectively and fixedly connected with the central ring and the outer ring, and an airflow channel is formed between the adjacent first pre-rotation blade grids; and the mounting port penetrates through part of the blade grid assembly or penetrates through part of the blade grid assembly and the outer ring respectively.

In some embodiments, the first pre-rotation vane cascade has a working surface facing the airflow channel, the working surface having a cross-sectional line shape consisting of any one of a circular arc, a bezier curve, or a multi-segment curve.

In some embodiments, the gas flow inlet angle of the first pre-rotation cascade is from 5 ° to 90 °, and the gas flow outlet angle of the first pre-rotation cascade is from 90 ° to 175 °.

In some embodiments, the center ring has a center cavity that opens in the direction of the air out, and the outer ring has an outer ring cavity that opens in the direction of the air out.

In some embodiments, the retainer ring further comprises an inner ring disposed between the center ring and the outer ring and fixedly connected to each of the first pre-rotation cascades; the mounting opening is located radially outward of the inner ring.

In some embodiments, the cascade assembly further comprises a second pre-rotation cascade, at least one second pre-rotation cascade is provided in each air flow channel, and a radially outer end of each second pre-rotation cascade is fixedly connected with the outer ring, and a space is reserved between a radially inner end and the central ring.

In some embodiments, the gas flow inlet angle of the second pre-rotation cascade is from 5 ° to 90 °, and the gas flow outlet angle of the second pre-rotation cascade is from 90 ° to 175 °.

the fan assembly comprises a wind cabinet, a driver, an impeller and a nozzle structure, 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 an output end of the driver, the fan assembly further comprises an air inlet ring protection net, the air inlet ring protection net is arranged at the air inlet and connected with the air inlet surface, the nozzle structure is fixedly connected with the air inlet surface, and part of the nozzle structure penetrates through the mounting opening and stretches into the wind cabinet.

In some embodiments, the air inlet device further comprises an air inlet ring, wherein the air inlet ring is arranged at the air inlet and is clamped between the air inlet ring protective net and 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 air inlet ring protective net, the plurality of first pre-rotation blade grids are arranged between the central ring and the outer ring at intervals along the circumferential direction, and each first pre-rotation blade grid forms the air flow inlet and the air flow outlet with a specific angle, so that the air inlet ring protective net has a pre-rotation function, the air inlet flow direction is consistent with the rotation direction of the first pre-rotation blade grid, the air inlet condition is improved, the increase of the impact loss of the blade inlet when no pre-rotation is avoided, the impeller suction surface is caused to generate a flow separation, the blade channels are blocked, and the performance of a fan assembly is reduced;

2. an airflow channel is formed between the adjacent first pre-rotation blade grids, and has certain sound insulation and reflection noise reduction effects on the radiation sound field in the fan assembly, so that noise is further reduced.

Drawings

FIG. 1 is a schematic view of a structure of an air intake ring protection net in an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of an air intake grommet panel in an embodiment of the present utility model;

FIG. 3 is a schematic view of the direction of air flow at the beginning of a pre-rotation cascade in an embodiment of the utility model;

FIG. 4 is a schematic view of the direction of airflow at the terminal end of a pre-rotation cascade 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-fixing ring, 11-center ring, 110-center cavity, 12-outer ring, 120-outer ring cavity, 121-mounting part and 13-inner ring; 2-cascade assembly, 20-airflow channel, 21-first pre-rotation cascade, 211-working face, 212-start, 213-end, 22-second pre-rotation cascade; 3-mounting ports;

41-wind cabinet, 410-wind inlet face, 411-wind inlet, 412-wind outlet, 42-driver, 43-impeller, 431-blade, 44-nozzle structure, 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 embodiment provides an air inlet ring protection net, which is applied to a fan assembly of a range hood, and comprises a fixed ring 1, a blade grid assembly 2 and a mounting port 3, wherein the fixed ring 1 comprises a central ring 11 and an outer ring 12, and the outer ring 12 is coaxially arranged at the periphery of the central ring 11. The cascade assembly 2 comprises a plurality of first pre-rotation cascades 21, the plurality of first pre-rotation cascades 21 are circumferentially and uniformly distributed between a central ring 11 and an outer ring 12 at intervals, the radially inner end and the radially outer end of each first pre-rotation cascades 21 are respectively fixedly connected with the central ring 11 and the outer ring 12, and each first pre-rotation cascades 21 is formed with an air inlet and an air outlet with specific inclined angles so that the air inlet protective net has a pre-rotation function and the air inlet and air flow direction is consistent with the rotation direction of the first pre-rotation cascades 21. An airflow channel 20 is formed between the adjacent first pre-rotation vane grids 21, and the airflow channel 20 is also formed with an airflow inlet and an airflow outlet with specific inclination angles, so that the fan assembly has certain sound insulation and reflection noise reduction effects on the radiation sound field inside the fan assembly. The mounting opening 3 extends through part of the cascade assembly 2 or through the cascade assembly 2 and the outer ring 12, respectively, and is used for allowing the nozzle structure on the fan assembly to pass through, so that part of the nozzle structure is mounted inside the fan cabinet on the fan assembly.

It can be seen that, in this embodiment, by disposing the plurality of first pre-rotation vane cascades 2 circumferentially spaced between the center ring 11 and the outer ring 12, each of the first pre-rotation vane cascades 2 forms an air flow inlet and an air flow outlet with a specific angle, so that the air inlet ring protection net has a pre-rotation function, the inlet air flow direction is consistent with the rotation direction of the first pre-rotation vane cascades 21, the air inlet condition is improved, the increase of the impact loss of the vane inlet when no pre-rotation is avoided, the flow is released from the suction surface of the impeller, the vane passage is blocked, and the performance of the fan assembly is reduced. In addition, an airflow channel 20 is formed between the adjacent first pre-rotation blade grids 21, the airflow channel 20 also forms an airflow inlet and an airflow outlet with specific inclination angles, and the fan assembly has certain sound insulation and reflection noise reduction effects on the radiation sound field inside the fan assembly, so that noise is further reduced. When the oil smoke flows through the air inlet ring protective net, part of the oil smoke 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.

Referring to fig. 2, in particular, the front face of the outer ring 12 is located on the rear side of the rear face of the center ring 11 with a space left therebetween. The central ring 11 has a central cavity 110 opening toward the air outlet direction, i.e., the central ring 11 has a central cavity 110 opening toward the rear, and the surface of the central cavity 110 facing the air flow is in any one of a hemispherical shape, a crown shape, a conical shape, a pyramid shape, a truncated cone shape and a pyramid shape with a high middle and a low edge, so that the central ring 11 plays a role of guiding the air, and the air flow flowing through the central ring is guided to the air inlet channel 20 conveniently. The outer ring 12 has an outer ring cavity 120 opening toward the air outlet direction, that is, the outer ring 12 has an outer ring cavity 120 opening toward the rear, and a plurality of mounting portions 121 are circumferentially disposed on the outer ring 12 at intervals, and each mounting portion 121 is used for detachably connecting a fan assembly to mount the air inlet ring protection net on the fan assembly.

Referring to fig. 1, the fixing ring 1 further includes an inner ring 13, the inner ring 13 is disposed between the central ring 11 and the outer ring 12, and the inner ring 13 is fixedly connected with each first pre-rotation vane grid 21, so that by adding the inner ring 13, the overall strength of the vane grid assembly 2 is enhanced, so that the installation of the vane grid assembly 2 is more firm and reliable; in addition, each of the first pre-rotation vane cascades 21 is divided into an inner end pre-rotation vane cascades and an outer end pre-rotation vane cascades, and the air flow passage 20 is divided into an inner end air passage and an outer end air passage, so that the air flow of the intake air flowing through the inner end air passage and the outer end air passage is prevented from being disturbed. The mounting opening 3 is located radially outwardly of the inner collar 13, and the mounting opening 3 extends through a portion of the outer peripheral rim 12 and a portion of the pre-rotation cascade of the cascade assembly 2, respectively, so that the inlet collar guard net is formed with a notch.

Referring to fig. 1-2, the first pre-rotation vane cascade 21 has a working surface 211 facing the air flow passage 20, and a cross-sectional line shape of the working surface 211 in the front-rear direction is composed of any one of a circular arc line, a bezier curve, or a multi-segment curve, so as to ensure that the first pre-rotation vane cascade 21 has a pre-rotation function, thereby ensuring that the direction of the intake air flowing through the air flow passage 20 is consistent with the rotation direction of the first pre-rotation vane cascade 21.

In this embodiment, the cross-sectional line shape of the working surface 211 in the front-rear direction is exemplified by a circular arc line, the end of the first pre-rotation vane cascade 21 near the center ring 11 is a start end 212, and the end of the first pre-rotation vane cascade 21 near the outer ring 12 is a finish end 213. The air inlet angle of any position of the first pre-rotation vane grid 21 along the radial direction is 5-90 degrees, and the air outlet angle of any position of the first pre-rotation vane grid 21 along the radial direction is 90-175 degrees, so that the section sizes of the radially inner ends of the air channels 20 on the horizontal plane are different from front to back, namely the air inlet angle and the air outlet angle of the air channels 20 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. 2-3, the gas flow inlet angle at the beginning 212 is 5 ° to 90 °, and the gas flow outlet angle at the beginning 212 is 90 ° to 175 °. In the present embodiment, the air inlet angle of the start end 212 is the included angle θ1 between the front end of the working surface 211 and the horizontal plane, and the air outlet angle of the start end 212 is the included angle β1 between the rear end of the working surface 211 and the horizontal plane.

Referring to fig. 2 and 4, the gas inflow opening angle of the terminal 213 is 5 ° to 90 °, and the gas outflow opening angle of the terminal 213 is 90 ° to 175 °. In this embodiment, the air inlet angle of the terminal 213 is the angle θ2 between the front end of the working surface 211 and the horizontal plane, and the air outlet angle of the terminal 213 is the angle β2 between the rear end of the working surface 211 and the horizontal plane.

Referring to fig. 1, the cascade assembly 2 further comprises a second pre-rotation cascade 22, at least one second pre-rotation cascade 22 being provided in each air flow channel 20, the radially outer ends of the second pre-rotation cascades 22 being fixedly connected to the outer ring 12, leaving a space between the radially inner ends and the central ring 11. In this embodiment, for example, a second pre-rotation vane grid 22 is disposed in each airflow channel 20, and the radially inner end of the second pre-rotation vane grid 22 is designed to be fixedly connected with the inner ring 13, so that the radially outer end (i.e. the outer end air channel) of the airflow channel 20 is in an encrypted design, so that the airflow velocity flowing between the second pre-rotation vane grid 22 and the radially outer end of the first pre-rotation vane grid 21 is higher, and the vane grid assembly 2 enhances the sound insulation effect through encryption, thereby further reducing noise.

The second pre-rotation vane cascade 22 also has a pre-rotation function that enables the intake air flow direction to coincide with the rotation direction thereof to improve the intake condition. Further, the air inlet angle of the second pre-rotation vane cascade 22 is 5 ° to 90 °, and the air outlet angle of the second pre-rotation vane cascade 22 is 90 ° to 175 °.

In other embodiments, only the inner annular ring 13 may be omitted, in which case the radially inner end of the second pre-rotation vane cascade 22 is the free end. Of course, it is also possible to dispense with only the second pre-rotation vane cascade 22 or with both the inner ring 13 and the second pre-rotation vane cascade 22.

Referring to fig. 5-6, the present embodiment further provides a fan assembly, which includes a fan cabinet 41, a driver 42, an impeller 43 and a nozzle structure 44, including an air inlet ring protection net as described above, wherein the fan cabinet 41 has a front plate of the fan cabinet forming an air inlet surface 410, an air inlet 411 is provided at the air inlet surface 410 of the fan cabinet 41, and an air outlet 412 is provided at the top of the fan cabinet 41. An impeller 43 is rotatably disposed within the cabinet 41 and is coupled to the output of the driver 42. The air inlet ring protective net is arranged at the air inlet 411 and is detachably connected with the air inlet surface 410. The nozzle structure 44 is fixedly connected to the air inlet surface 410, and a part of the nozzle structure 44 extends into the air cabinet 41 through the mounting opening 3.

Thus, by detachably mounting the inlet ring protection net at the air inlet 411, firstly, the inlet air flow direction is consistent with the rotation direction of the first pre-rotation vane grid 21, and the inlet air condition is improved; secondly, the sound insulation and reflection noise reduction effects on the radiation sound field in the fan assembly are achieved to a certain extent, and noise is further reduced; thirdly, when the oil smoke flows through the air inlet ring protective net, part of the oil smoke can be condensed on the fixed ring 1 and the pre-rotation She Shan of the blade grid assembly 2, so that the oil separating effect is improved; fourth, the assembly of the nozzle structure 44 is not affected, and an additional mounting port of the nozzle structure 44 is not required to be additionally arranged on the air cabinet 41.

In this embodiment, the air intake assembly further includes an air intake ring 45, the air intake ring 45 is disposed at the air intake 411, and is clamped between the air intake ring protection net and the air intake surface 410. Specifically, the air inlet ring 45 has a mounting surface 451, an outer air guiding surface 452 and an inner air guiding surface 453, which are all in a ring 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 air inlet ring protective net and the air inlet surface 410 of the air cabinet 41, and the installation part 141 of the air inlet ring protective net and the installation surface 451 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 120 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 120 abuts against the outer air guide face 452 of the air inlet ring 45, so that after the inlet air flows through the air flow channel 20 of the 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, which is provided with the fan assembly, and the air inlet ring protection net is arranged at the air inlet of the fan assembly, so that the air inlet ring protection net forms a pre-rotation blade grid with a specific angle, the air inlet condition is improved, the effects of sound insulation and reflection noise reduction are achieved, the noise is further reduced, and the user experience is improved.

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. An air inlet ring protection net, which is characterized by comprising:

the fixing ring (1) comprises a central ring (11) and an outer ring (12), wherein the outer ring (12) is coaxially arranged at the periphery of the central ring (11);

the vane cascade assembly (2) comprises a plurality of first pre-rotation vane cascades (21), wherein the plurality of first pre-rotation vane cascades (21) are circumferentially and uniformly distributed between the central ring (11) and the outer ring (12) at intervals, the radial inner end and the radial outer end of each first pre-rotation vane cascades (21) are respectively and fixedly connected with the central ring (11) and the outer ring (12), and an airflow channel (20) is formed between the adjacent first pre-rotation vane cascades (21);

and a mounting opening (3) penetrating part of the blade grid assembly (2) or penetrating part of the blade grid assembly (2) and the outer ring (12) respectively.

2. An air inlet ring protection net according to claim 1, characterized in that the first pre-rotation vane grid (21) is provided with a working surface (211) facing the air flow channel (20), and the cross section line shape of the working surface (211) is composed of any one of circular arc lines, bezier curves or multi-section curves.

3. An air inlet grommet screen as in claim 1 or 2, wherein the air inlet angle of the first pre-swirl vane cascade (21) is from 5 ° to 90 ° and the air outlet angle of the first pre-swirl vane cascade (21) is from 90 ° to 175 °.

4. An air inlet ring protection net according to claim 1, characterized in that the central ring (11) is provided with a central cavity (110) which is open towards the air outlet direction, and the outer ring (12) is provided with an outer ring cavity (120) which is open towards the air outlet direction.

5. An air inlet ring protection net according to claim 1, wherein the fixing ring (1) further comprises an inner ring (13), and the inner ring (13) is arranged between the central ring (11) and the outer ring (12) and fixedly connected with each first pre-rotation blade grid (21); the mounting opening (3) is located radially outside the inner ring (13).

6. An air inlet ring protection net according to claim 1 or 5, characterized in that the blade grid assembly (2) further comprises a second pre-rotation blade grid (22), at least one second pre-rotation blade grid (22) is arranged in each air flow channel (20), and the radial outer end of each second pre-rotation blade grid (22) is fixedly connected with the outer ring (12), and a space is reserved between the radial inner end and the central ring (11).

7. An air inlet ring protection net according to claim 6, characterized in that the air inlet angle of the second pre-rotation vane grid (22) is 5-90 degrees, and the air outlet angle of the second pre-rotation vane grid (22) is 90-175 degrees.

8. Fan subassembly, including wind cabinet (41), driver (42), impeller (43) and nozzle structure (44), 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), its characterized in that still includes an inlet ring protection network of any one of claims 1-7, inlet ring protection network set up in air intake (411) department and connect inlet face (410), nozzle structure (44) fixed connection inlet face (410) are last, and part of nozzle structure (44) pass mounting hole (3) stretch into wind cabinet (41) the inside.

9. The fan assembly of claim 8, further comprising an air intake collar (45), the air intake collar (45) being disposed at the air intake (411) and being clamped between the air intake collar guard and the air intake face (410).

10. A range hood having a fan assembly as claimed in claim 8 or 9.