CN216199246U

CN216199246U - A casing, centrifugal fan and air conditioner for centrifugal fan

Info

Publication number: CN216199246U
Application number: CN202122450716.XU
Authority: CN
Inventors: 吴波; 曹代科; 王锡栋
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-04-05
Anticipated expiration: 2031-10-11

Abstract

The application relates to the technical field of fans, and provides a casing for a centrifugal fan on the one hand. The casing comprises a volute and a silencing cover. The spiral case includes air inlet section and air-out section, and the air-out section is located air inlet section's circumference and just communicates with air inlet section. The air inlet section is provided with an air inlet, the air outlet section is provided with an air outlet, and the side wall of the air outlet section is provided with a silencing hole. The silencing cover is positioned outside the volute and covers the periphery of the silencing hole to jointly enclose and form a silencing cavity. The casing for centrifugal fan that this application embodiment provided sets up the noise reduction hole on the air-out section and the noise reduction cover that the noise reduction hole was located to the cover to form the double-deck spiral case amortization structure that has the noise reduction chamber, can effectively reduce the torrent noise in centrifugal fan exit, improve user experience. On the other hand, the noise reduction cover is arranged outside the volute and can be detached according to actual conditions, the double-layer noise reduction structure of the volute is high in refittability, and noise reduction can be performed on different frequency bands.

Description

A casing, centrifugal fan and air conditioner for centrifugal fan

Technical Field

The application relates to the technical field of fans, in particular to a shell for a centrifugal fan, the centrifugal fan and an air conditioner.

Background

The noise of the existing centrifugal fan used for the air conditioner in the working process is high, and the user experience is poor.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiments of the present application are expected to provide a casing for a centrifugal fan, a centrifugal fan and an air conditioner, which have a good noise reduction effect.

An aspect of an embodiment of the present application provides a casing for a centrifugal fan, including:

the volute comprises an air inlet section and an air outlet section, the air outlet section is positioned on the circumferential direction of the air inlet section and is communicated with the air inlet section, the air inlet section is provided with an air inlet, the air outlet section is provided with an air outlet, and the side wall of the air outlet section is provided with a silencing hole;

the silencing cover is positioned outside the volute and covers the periphery of the silencing hole to jointly enclose and form a silencing cavity.

In some embodiments, the muffling aperture is in a slit configuration.

In some embodiments, the width of the bloop is between 0.5mm and 5 mm.

In some embodiments, the number of the silencing holes is multiple, and the silencing holes are distributed at intervals.

In some embodiments, the muffling holes are of a microporous structure, the number of the muffling holes is multiple, and the plurality of muffling holes are arranged in an array.

In some embodiments, the muffling hole is a circular hole, and the diameter of the muffling hole is between 0.5mm and 5 mm.

In some embodiments, the minimum distance between two adjacent silencing holes is 5 mm-30 mm.

In some embodiments, the sound-attenuating chamber has a depth of 5mm to 30 mm.

In some embodiments, the plurality of sidewalls of the air outlet section are each formed with a silencing hole.

In some embodiments, the cabinet includes a sound absorbing material located within the sound-deadening chamber and secured to an inner surface of the sound-deadening hood.

In some embodiments, the sound absorbing material has a thickness of between 3mm and 30 mm.

Another aspect of the embodiments of the present application provides a centrifugal fan, including:

the housing of any of the above;

the centrifugal wind wheel is rotatably arranged in the air inlet section.

In another aspect, an air conditioner is provided, which includes the centrifugal fan as claimed in the above claims.

The casing for centrifugal fan that this application embodiment provided sets up the noise reduction hole on the air-out section and the noise reduction cover that the noise reduction hole was located to the cover to form the double-deck spiral case amortization structure that has the noise reduction chamber, can effectively reduce the torrent noise in centrifugal fan exit, improve user experience. On the other hand, the noise reduction cover is arranged outside the volute and can be detached according to actual conditions, the double-layer noise reduction structure of the volute is high in refittability, and noise reduction can be performed on different frequency bands.

Drawings

Fig. 1 is a schematic structural diagram of a chassis according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure shown in FIG. 1 from another perspective;

FIG. 3 is a schematic view of the volute of the structure shown in FIG. 2, wherein a silencing hole of a slit structure is schematically shown;

FIG. 4 is an exploded view of the structure shown in FIG. 2, schematically illustrating the muffling holes, the muffling cover and the sound absorbing material of the slit structure;

FIG. 5 is a schematic view of the volute of the structure shown in FIG. 2, wherein a muffling hole of a circular hole structure is schematically shown;

fig. 6 is an exploded view of the structure shown in fig. 2, in which the muffling holes, the muffling cover and the sound-absorbing material of the circular hole structure are schematically shown.

Fig. 7 is a schematic structural view of the structure shown in fig. 1, in which an air inlet section and an air outlet section are schematically shown.

Description of the reference numerals

A volute 1; an air outlet 1 a; a sound deadening hole 1 b; a snail-shaped back plate 11; side plates 12; an air inlet section 13; an air outlet section 14; a sound-deadening hood 2; a sound absorbing material 3; the side casing 4; an internal circulation intake port 4 a; and a centrifugal wind wheel 9.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The directional terms in the description of the present application are for convenience only in describing the direction or positional relationship in which the housing is normally used, and it is to be understood that these directional terms are for convenience only in describing the present application and for simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

Referring to fig. 1, 2, 4 and 7, an embodiment of the present application provides a casing for a centrifugal fan, wherein the casing includes a volute 1 and a silencing cover 2. The volute 1 comprises an air inlet section 13 and an air outlet section 14, and the air outlet section 14 is located on the circumferential direction of the air inlet section 13 and is communicated with the air inlet section 13. The air inlet section 13 is provided with an air inlet, the air outlet section 14 is provided with an air outlet 1a, and the side wall of the air outlet section 14 is provided with a silencing hole 1 b. The silencing cover 2 is positioned outside the volute 1 and covers the periphery of the silencing hole 1b to jointly enclose and form a silencing cavity. It should be noted that the air inlet section 13 is an annular structure section provided with a wind wheel, and the air outlet section 14 is a straight-tube structure section arranged on the circumferential direction of the air inlet section 13. When the centrifugal fan is adopted for ventilation and heat dissipation, the running noise of the fan is harmful to a human body, the running noise of the fan is reduced, and great help is provided for reducing the system noise, the noise of the existing centrifugal fan is large in the working process, for example, the rotating speed of the centrifugal fan in a system of an air conditioner cabinet is high, the noise is large, the air outlet 1a is not subjected to any noise reduction treatment, the use experience of a user on equipment is seriously influenced, the shell for the centrifugal fan is provided by the embodiment of the application, the air outlet section 14 is provided with the silencing hole 1b and the silencing cover 2 which is covered on the silencing hole 1b, so that the silencing structure of the double-layer volute 1 with the silencing cavity is formed, the turbulence noise at the outlet of the centrifugal fan can be effectively reduced, and the user experience is improved. On the other hand, the silencing cover 2 is positioned outside the volute 1 and can be detached according to actual conditions, the double-layer silencing structure of the volute 1 is high in refittability, and silencing and noise reduction can be carried out on different frequency bands.

In one embodiment, referring to fig. 3, the number of the muffling holes 1b is multiple, and the muffling holes 1b are distributed at intervals. Specifically, the porous resonance sound absorption structure with the sound absorption cavity, which is composed of the sound absorption holes 1b, can be designed as a simple vibration system which is composed of a spring and an object with a certain mass hung on the spring, when external sound waves are transmitted to the sound absorption cavity, an air column in a hole neck moves like a piston under the action of the sound waves, so that part of air molecules and the hole wall rub to convert sound energy into heat energy for consumption, and an effective noise reduction effect is achieved.

In an exemplary embodiment, referring to fig. 3, the muffling hole 1b is formed along a slit. The plurality of silencing holes 1b in the slit structure are arranged on the air outlet section 14 in parallel relatively, and the slit-shaped silencing holes 1b extend to the edge of the side wall of the air outlet section 14 where the slit-shaped silencing holes are located. That is, the slit length of the slit-shaped muffling hole 1b is as long as possible in accordance with the longest cross-sectional length of each outlet surface, so that the air outlet section 14 has a larger muffling area, and the muffling effect is further improved. In one embodiment, the width of the muffling hole 1b is between 0.5mm and 5 mm. In other words, the slit width of the slit structure may range from 0.5mm to 5mm, and may be 0.5mm, 0.7mm, 1.2mm, 3mm, 5 mm. Optionally, in an embodiment, the width of the muffling hole 1b is 1 mm.

For example, in an embodiment, referring to fig. 5, the muffling holes 1b are in a microporous structure, the number of the muffling holes 1b is multiple, and the plurality of muffling holes 1b are arranged in an array. That is, a plurality of minute holes are densely arranged in an array to form a sound deadening region, and the structural shape of the sound deadening hole 1b is not limited. Such as square holes, elliptical holes, etc. In one embodiment, the muffling hole 1b is a circular hole, and the diameter of the muffling hole 1b is between 0.5mm and 5 mm. In other words, the diameter of the circular hole ranges from 0.5mm to 5mm, and may be 0.5mm, 0.7mm, 1.2mm, 4mm, 5 mm. Optionally, in an embodiment, the diameter of the circular hole is 3 mm. The minimum distance between two adjacent silencing holes 1b is 5 mm-30 mm, and can be 5mm, 6mm, 12mm, 24mm, 30 mm. Optionally, in an embodiment, the distance between the circular holes is 7 mm. The number of the drilled holes is determined according to the hole spacing and the area of the silencing area, and the positions of the drilled holes are arranged at the position, close to the air outlet 1a, of the air outlet section 14 as much as possible.

In one embodiment, the depth of the sound attenuation cavity is 5 mm-30 mm. That is, the distance from the side wall of the air outlet section 14 provided with the muffling hole 1b to the muffling cover 2 is 5mm to 30 mm. The double-layer volute 1 silencing structure formed in the way has more proper silencing frequency band and larger sound resistance coefficient.

In one embodiment, referring to fig. 4 and 6, the casing includes a sound absorbing material 3, and the sound absorbing material 3 is located in the sound-deadening cavity and fixed on the inner surface of the sound-deadening hood 2. The silencing cover 2 and the side wall of the air outlet section 14 provided with the silencing hole 1b form a double-layer volute 1 silencing structure which is a resistance silencing structure, the sound absorbing material 3 is arranged to be a resistance silencing mechanism, and the combined structure of the resistance silencing mechanism and the sound absorbing material can further absorb the pulse force of uneven airflow coming out of the impeller and the turbulent flow pulse force in the volute, so that the rotating noise and the vortex noise can be reduced to some extent.

The sound absorbing material 3 may have a three-dimensional porous structure such as sound absorbing cotton, for example, melamine foam or urethane foam. Illustratively, in one embodiment, the sound absorbing material 3 has a thickness of between 3mm and 30 mm. Can be 3mm, 6mm, 12mm, 24mm, 30 mm. Optionally, in an embodiment, the thickness of the sound absorbing material 3 is 10 mm.

In an embodiment, referring to fig. 4 and 6, the muffling holes 1b are formed on a plurality of sidewalls of the air outlet section 14. A plurality of lateral walls all set up the noise elimination hole 1b, can increase the amortization area of air-out section 14 to strengthen its noise cancelling effect.

Another aspect of the application provides a centrifugal fan, centrifugal fan includes above-mentioned casing and centrifugal wind wheel 9 of any one, and centrifugal wind wheel 9 rotationally sets up in air inlet section 13. Specifically, in an embodiment, referring to fig. 1, fig. 2 and fig. 4, the casing further includes a side casing 4 covering one side of the air inlet, the side casing 4 is formed with an internal circulation air inlet 4a and a side air duct communicating the internal circulation air inlet 4a with the air inlet, and the centrifugal wind wheel 9 drives the airflow to sequentially pass through the side air duct, the air inlet section 13 and the air outlet section 14 from the internal circulation air inlet 4a and finally flow out of the air outlet 1 a.

The volute 1 comprises a volute back plate 11 arranged in the circumferential direction of the centrifugal wind wheel 9 and a side plate 12 located at the axial direction of the centrifugal wind wheel 9 and far away from one end of the side shell 4, an air inlet is formed in one end, along the axial direction of the centrifugal wind wheel 9, of the volute back plate 11, an air outlet 1a is located in the radial direction of the centrifugal wind wheel 9, and the volute is formed by the side shell 4, the side plate 12 and the volute back plate 11 in a surrounding mode.

Snail form backplate 11 and curb plate 12 are close to air outlet 1a department and all are formed with noise damping hole 1b, and noise damping cover 2 sets up and forms the noise damping chamber jointly in the noise damping hole 1b outside, is provided with sound absorbing material 3 in the noise damping chamber, so make up jointly in order to be formed with the centrifugal fan that a amortization noise reduction effect is good.

Compared with a conventional volute structure, the pair of data of the noise test of the centrifugal fan according to the embodiment of the present application is shown in the following table, and it can be known from the following table that the attenuation of the air volume is not large at the same rotation speed, but the noise reduction is improved greatly.

Still another aspect of the present application provides an air conditioner including the above centrifugal fan.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An enclosure for a centrifugal fan, comprising:

2. The enclosure of claim 1, wherein the muffling aperture is in a slit configuration.

3. The cabinet of claim 2, wherein the width of the muffling hole is between 0.5mm and 5 mm.

4. The enclosure of claim 2, wherein the number of the muffling holes is plural, and the plurality of the muffling holes are spaced apart.

5. The casing of claim 1, wherein the muffling holes are of a microporous structure, the number of the muffling holes is multiple, and the muffling holes are arranged in an array.

6. The casing of claim 5, wherein the muffling hole is a circular hole, and the diameter of the muffling hole is between 0.5mm and 5 mm.

7. The cabinet of claim 5, wherein the minimum distance between two adjacent muffling holes is 5mm to 30 mm.

8. The enclosure according to any of claims 1 to 7, wherein the depth of the sound-deadening chamber is between 5mm and 30 mm.

9. The casing of any one of claims 1 to 7, wherein muffling holes are formed on a plurality of side walls of the air outlet section.

10. The enclosure of any of claims 1-7, comprising a sound absorbing material positioned within the sound-deadening chamber and affixed to an inner surface of the sound-deadening hood.

11. The cabinet of claim 10, wherein the sound absorbing material has a thickness of between 3mm and 30 mm.

12. A centrifugal fan, comprising:

the housing of any of claims 1-11;

the centrifugal wind wheel is rotatably arranged in the air inlet section.

13. An air conditioner characterized by comprising the centrifugal fan of claim 12.