CN111878459A

CN111878459A - Volute, centrifugal fan and household appliance

Info

Publication number: CN111878459A
Application number: CN202010733358.0A
Authority: CN
Inventors: 崔剑飞; 汤雁翔; 陈帆; 刘司轶; 邹先平; 陈硕
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2020-11-03

Abstract

The application provides a spiral case, a centrifugal fan and a household appliance. The volute comprises a volute body, wherein an air inlet chamber and an exhaust channel communicated with the air inlet chamber are formed in the volute body, a multi-stage guide plate is installed in the exhaust channel, and the guide plate is arranged in a zigzag mode from the direction of an air inlet of the exhaust channel to the direction of an air outlet of the exhaust channel. By applying the technical scheme of the invention, the guide plate is arranged into a zigzag shape, so that the energy of noise can be reflected and rebounded by the guide plate for many times to be reduced in the process of transmitting the noise through the exhaust channel, and the effect of further reducing the noise of the volute is achieved.

Description

Volute, centrifugal fan and household appliance

Technical Field

The invention relates to the technical field of wind power components, in particular to a volute, a centrifugal fan and a household appliance.

Background

As the demand for comfort in living continues to increase, the noise level of air conditioning systems is receiving more and more attention. The multi-wing centrifugal fan is widely applied to ventilation equipment such as air conditioners, range hoods and the like due to the characteristics of small size, large flow and the like, but the application of the centrifugal fan is also seriously influenced by the noise generated when the multi-wing centrifugal fan operates.

At present, the noise reduction measure of the centrifugal fan is to install a silencer on a pipeline of an air inlet and an air outlet of the fan and reduce the noise by methods such as a rotary diffuser and the like. For a volute applying a centrifugal fan, the existing noise reduction method is limited to adding a guide plate at an air outlet of the volute to reduce noise.

However, the above noise reduction means for the volute has a relatively limited actual noise reduction effect for the volute, and further improvement is needed for noise reduction of the volute.

Disclosure of Invention

The embodiment of the invention provides a volute, a centrifugal fan and a household appliance, and aims to solve the technical problem that the noise reduction effect of the volute in the prior art needs to be improved.

The embodiment of the application provides a volute, including the volute body, be formed with on the volute body intake chamber and with the exhaust passage that the intake chamber is linked together, install the guide plate in the exhaust passage, the guide plate is followed exhaust passage's air inlet direction orientation exhaust passage's gas outlet direction is the zigzag setting.

In one embodiment, the baffle comprises at least two connected and oppositely inclined linear plate sections.

In one embodiment, the baffle includes a first linear plate section, a second linear plate section, and a third linear plate section connected in sequence, the free end of the first linear plate section is opposite to the air inlet of the exhaust passage, and the free end of the third linear plate section is opposite to the air outlet of the exhaust passage.

In one embodiment, the air inlet end of the deflector and/or the air outlet end of the deflector is curved.

In one embodiment, the baffles are multi-staged.

In one embodiment, the exhaust passage and the intake chamber are respectively communicated through a volute tongue structure and an arc-shaped structure, and the lengths of the guide plates of each stage of the multi-stage guide plates gradually increase from one side of the volute tongue structure to one side of the arc-shaped structure in the exhaust passage.

In one embodiment, the air inlet end of the air guide plate corresponding to the space between the top end of the air inlet chamber and the cambered surface structure in the horizontal direction is positioned on the first straight line in the vertical direction.

In one embodiment, the first line is disposed at an angle to the horizontal in the vertical direction.

In one embodiment, the air inlet end of the baffle corresponding to the space between the top end of the air inlet chamber and the volute tongue structure in the horizontal direction is positioned on the first arc line in the vertical direction.

In one embodiment, two adjacent straight line plate sections are in transition through a fillet.

In one embodiment, the baffles of adjacent two stages are arranged at equal intervals.

In one embodiment, sound absorbing material is provided on the deflector and/or the exhaust channel.

The embodiment of the application also provides a centrifugal fan, which comprises a volute and fan blades arranged on the air inlet chamber of the volute, wherein the volute is the volute.

The embodiment of the application also provides a household appliance, which comprises a centrifugal fan, wherein the centrifugal fan is the centrifugal fan.

In the above embodiment, the guide plate is arranged to be in a zigzag shape, so that the energy of noise is reflected and rebounded by the guide plate for multiple times and then reduced in the process of transmitting the noise through the exhaust channel, and the effect of further reducing the noise of the volute is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic perspective view of an embodiment of a centrifugal fan according to the present invention;

FIG. 2 is a schematic cross-sectional view of the centrifugal fan of FIG. 1;

FIG. 3 is a schematic view of a cross-sectional structure and a partially enlarged structure of the centrifugal fan of FIG. 1;

FIG. 4 is a schematic diagram comparing the wind field distribution of a prior art centrifugal fan and a centrifugal fan of the present invention;

fig. 5 is a schematic diagram comparing the vortex distribution of a centrifugal fan of the prior art and a centrifugal fan of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

Fig. 1, 2 and 3 show a volute of the present invention, which includes a volute body, an air inlet chamber 10 and an air outlet channel 20 communicated with the air inlet chamber 10 are formed on the volute body, a baffle 30 is installed in the air outlet channel 20, and the baffle 30 is arranged in a zigzag shape from the air inlet direction of the air outlet channel 20 to the air outlet direction of the air outlet channel 20.

By applying the technical scheme of the invention, the guide plate 30 is arranged in a zigzag shape, so that the energy of noise can be reflected and rebounded by the guide plate 30 for multiple times to be reduced in the process of transmitting the noise through the exhaust channel 20, and the effect of further reducing the noise of the volute is achieved.

As shown in fig. 3, the air inlet end of the baffle 30 and/or the air outlet end of the baffle 30 are curved. Preferably, the curved shape is half of the length of the ellipse, as shown in fig. 3, and a and b are the major axes of the ellipse. Preferably, the major axis and the minor axis of the ellipse at the air inlet end of the air deflector 30 should be 2b/S4 (2-4), and the major axis and the minor axis of the ellipse at the air outlet end of the air deflector 30 should be 2a/S4 (3-5).

As shown in fig. 2 and 3, the baffle 30 includes a first linear plate section 31, a second linear plate section 32, and a third linear plate section 33 connected in sequence, a free end of the first linear plate section 31 is opposite to the air inlet of the exhaust passage 20, and a free end of the third linear plate section 33 is opposite to the air outlet of the exhaust passage 20. Wherein α is an opening angle of the air outlet of the exhaust passage 20 of the volute, and L is a distance between the front edge of the first linear plate section 31 of the first-stage baffle 30 and the center of the impeller. The adjacent two stages of guide plates 30 are arranged at equal intervals, and S is the distance between the adjacent two stages of guide plates 30. D is the impeller diameter, S1 is the length of the first linear plate segment 31 of the first stage, S2 is the length of the second linear plate segment 32, S3 is the length of the third linear plate segment 33, and S4 is the thickness of the baffle 30. Preferably, in the same stage, the first linear plate section 31 should be higher than the second linear plate section 32 than the third linear plate section 33 in the vertical direction.

It should be noted that the baffle 30 includes at least two connected and relatively inclined straight plate sections. Preferably, the angle of inclination between two adjacent straight plate segments of the baffle 30 should be the same as the outlet opening angle α of the volute.

More preferably, the baffles 30 are multi-staged.

It should be noted that, in fig. 2, the baffle 30 corresponding to the top end of the air inlet chamber 10 is the nth stage baffle 30, and the baffle 30 corresponding to the arc structure 50 is the nth stage baffle 30. More preferably, the exhaust channel 20 and the intake chamber 10 are respectively communicated through the volute tongue structure 40 and the cambered surface structure 50, and the lengths of the guide plates 30 of each stage of the multi-stage guide plates 30 gradually increase from the volute tongue structure 40 side to the cambered surface structure 50 side in the exhaust channel 20. In the vertical direction, the air inlet end of the air inlet chamber 10 and the air inlet end of the air deflector 30 corresponding to the space between the cambered surface structures 50 are positioned on the first straight line. In the vertical direction, the air inlet end of the guide plate 30 corresponding to the space between the top end of the air inlet chamber 10 and the volute tongue structure 40 is positioned on the first arc line. The first straight line is BC, the first arc line is AB, and preferably, the circular arc segment AB should be a circle center based on the base circle and a radius based on a distance from the front edge of the first-stage first straight line segment 31 to the circle center. Beta is an included angle between BC and the horizontal plane, that is, a complement angle of an included angle between BC and the first straight line plate section 31, H is a distance between the nth-stage flow guide plate 30 and the inner wall surface of the outlet of the volute, and as shown in fig. 2, an angle beta is formed between the first straight line and the horizontal plane in the vertical direction. Preferably, the value of beta is within the range of 35 DEG to 45 deg.

Preferably, the structural features of the upper and lower portions of the exhaust channel 20 are identical to those of the baffle 30.

As shown in FIG. 2, two adjacent straight line plate sections are transited by a round corner R. R is the angle of the first linear plate section 31 and the second linear plate section 32 and the angle of the second linear plate section 32 and the third linear plate section 33. Preferably, R should be R.gtoreq.0.1D; the thickness S4 of the guide plate 30 is 0.011D and more than or equal to S4 and more than or equal to 0.014D.

Preferably, the distance L from the front end of the first straight plate segment 31 of the first-stage baffle 30 to the center of the impeller is equal to D/2+ (0.06-0.08) D; preferably, the distance S between stages should be, S ═ C/N > 0.06D; wherein C is the volute outlet width and N is the baffle 30 level. Preferably, the distance S1 of the first linear plate section 31 of the first stage baffle 30 should be S1 ≧ S, which is not preferred to be too large. Preferably, the distance S2 of the second straight line segments 32 should be such that S2 ═ S1+ ns)/cos α, and the second straight line segments 32 of each stage are all equidistant. The distance S3 of the third straight line segment 33 should be S3> S1, and the distances of the third straight line segments 33 of each stage are equal, S3 should not be too large to make the outlet of the volute too long.

Preferably, the distance of H is 0.95A ≦ H ≦ 1.05A, where A is the opening of the volute.

Optionally, in the technical solution of the present invention, sound absorbing materials are disposed on both sides of the flow guide plate 30 and the exhaust passage 20. Preferably, sound absorbing materials are attached to both sides of each stage of the noise reduction guide plate 30, and the inner side surface at the air outlet of the volute is also provided with the sound absorbing materials, and the sound absorbing materials form a sound absorbing layer. The sound absorbing material can be sponge or rock wool or other porous material.

As shown in fig. 2 and fig. 3, a noise reduction guide plate 30 is disposed at the volute air outlet of the multi-wing centrifugal fan, and the noise reduction guide plate 30 is divided into a first linear plate section 31, a second linear plate section 32 and a third linear plate section 33 at the same stage, and is composed of a plurality of overlapped stages. As can be seen from fig. 3, the first linear plate section 31 of the same stage is higher than the second linear plate section 32 and higher than the third linear plate section 33, and whichever stage is, the distance between the next stage and the previous stage is equal, the stages are uniformly distributed at the volute outlet, and the length of the first linear plate section 31 between different stages is gradually lengthened from the first stage to the nth stage. The front end of the noise reduction guide plate 30 is arranged in the form that: the front end of the first straight line plate section 31 of the noise reduction baffle 30 is distributed according to an AB arc section and a BC line section. The front end and the rear end of each stage of the noise reduction guide plate 30 are elliptical. The noise reduction guide plate 30 is adhered with sound absorption materials which are distributed on two surfaces of each level and the inner side surface of the volute air outlet. The shape of the guide plate 30 is combined, and the special structural characteristics of the volute air outlet are achieved.

The centrifugal fan at the upper part of fig. 4 is a conventional fan, and the centrifugal fan at the lower part of fig. 4 is a centrifugal fan of the present invention. As can be seen from the figure, the velocity gradient is reduced after the guide plate 30 is added, the velocity of the air outlet is reduced, and the noise is correspondingly reduced. In fig. 5, the centrifugal fan at the upper part is the existing fan, and the centrifugal fan at the lower part of fig. 4 is the centrifugal fan of the present invention, it can be seen from the figure that, after the guide plate 30 is added, the vortex intensity near the volute tongue is reduced, and the guide plate 30 plays a role in breaking the vortex intensity, and reduces the noise.

By applying the volute provided by the invention, the guide plate 30 is arranged at the volute air outlet, so that the flow guide effect on the fluid at the volute air outlet is achieved. And through adopting the guide plate 30 of making an uproar that falls, can direct separation horizontal direction's the outside conduction of noise, first straight line section 31, second straight line plate section 32 and third straight line plate section 33 can the separation noise outwards propagate from the spiral case, and it has the sound absorbing material to paste on the guide plate 30 of making an uproar to fall, the sound absorbing material can the noise absorption at the reflection of the guide plate 30 of making an uproar that falls, the reflection noise is absorbed many times in the guide plate 30 of making an uproar that falls, the air current is through falling behind the guide plate 30 of making an uproar, the exit noise has been in very weak state. And because three line segments accord with the air current that flows out through the rotation of impeller more for rotatory air current flows out along guide plate 30, has improved the efficiency of fan.

The cross-sectional configuration of the baffle 30 is shown, and it is to be understood that any improved volute outlet configuration based on this configuration is within the scope of this patent.

The invention also provides a centrifugal fan. The centrifugal fan comprises a volute and fan blades 60 arranged on an air inlet chamber 10 of the volute, and the volute is the volute. When the centrifugal fan operates, the air flow does work through the fan blades to form high-pressure and high-speed air flow, and due to the influence of the volute and the double-suction centrifugal blades, great noise can be formed. By applying the technical scheme of the invention, the efficiency of the centrifugal fan is improved, the noise of the centrifugal fan is reduced, and the air flow at the air outlet is guided.

The invention also provides a household appliance comprising the centrifugal fan. It should be noted that, in the technical solution of the present invention, the household appliance may be an air conditioner or a range hood.

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

Claims

1. A volute comprises a volute body, wherein an air inlet chamber (10) and an exhaust channel (20) communicated with the air inlet chamber (10) are formed in the volute body, and a guide plate (30) is installed in the exhaust channel (20), and the volute is characterized in that the guide plate (30) is arranged in a zigzag manner from the direction of an air inlet of the exhaust channel (20) to the direction of an air outlet of the exhaust channel (20).

2. The spiral casing of claim 1 wherein the baffle (30) comprises at least two connected, relatively inclined linear plate segments.

3. The spiral casing of claim 2, wherein the baffle (30) comprises a first linear plate section (31), a second linear plate section (32) and a third linear plate section (33) connected in series, the free end of the first linear plate section (31) being opposite to the gas inlet of the gas exhaust channel (20), and the free end of the third linear plate section (33) being opposite to the gas outlet of the gas exhaust channel (20).

4. The spiral casing of claim 1, wherein the air inlet end of the deflector (30) and/or the air outlet end of the deflector (30) is curved.

5. The spiral casing of claim 1 wherein the baffle (30) is multi-staged.

6. The spiral casing of claim 5, wherein the exhaust passage (20) and the inlet chamber (10) are respectively communicated through a spiral tongue structure (40) and a cambered surface structure (50), and the lengths of the guide plates (30) of each stage of the multi-stage guide plates (30) are gradually increased from one side of the spiral tongue structure (40) to one side of the cambered surface structure (50) in the exhaust passage (20).

7. Volute according to claim 6, wherein the space between the top end of the inlet chamber (10) and the cambered surface (50) in the vertical direction corresponds to the air inlet end of the deflector (30) in the horizontal direction, which is located on the first straight line.

8. The spiral casing of claim 7 wherein the first line is angled from a horizontal plane in a vertical direction.

9. The spiral casing of claim 6, wherein the space between the top end of the inlet chamber (10) and the volute tongue structure (40) is located on the first arc line in the vertical direction corresponding to the air inlet end of the baffle plate (30) in the horizontal direction.

10. The spiral casing of claim 2 wherein adjacent linear plate segments are transitioned by a fillet.

11. The spiral casing of claim 5 wherein the baffles (30) of adjacent stages are equally spaced.

12. The spiral casing of any of claims 1 to 11, wherein the baffle (30) and/or the exhaust channel (20) is provided with a sound absorbing material.

13. A centrifugal fan comprising a volute and blades (60) mounted on an inlet chamber (10) of the volute, wherein the volute is as claimed in any one of claims 1 to 12.

14. A household appliance comprising a centrifugal fan, characterized in that said centrifugal fan is the centrifugal fan according to claim 13.