Centrifugal fan volute with noise reduction effect

Abstract

The centrifugal fan volute with the noise reduction effect is provided with an inner space used for installing a movable impeller, an air outlet is formed in one side of the centrifugal fan volute, an air inlet communicated with the inner space is formed in the lower end of the centrifugal fan volute, and an installation base fixedly installed and connected with a motor is arranged at the upper end of the centrifugal fan volute. Wherein the side wall surface of the internal space is provided with a plurality of convex ribs which are distributed at intervals in the circumferential direction, and the circumferential distances between the adjacent convex ribs are not equal; the noise and blade frequency sharp sound of the centrifugal fan are effectively reduced, and the excellent noise reduction effect of the centrifugal fan is achieved through a simple and low-cost structure.

Description

Technical Field

[0001] The utility model belongs to the field of centrifugal fan structures, and in particular relates to a centrifugal fan volute with noise reduction effect. Background Art

[0002] Due to the high motor speeds of centrifugal fans used in sweepers, they often produce high noise, high pitched sounds, and unusual noises, which seriously affect the user's hearing. With the trend towards smaller fans, the noise problem has become even more prominent.

[0003] Therefore, the applicant hopes to seek technical solutions to solve the above technical problems. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a centrifugal fan volute with noise reduction effect, which effectively reduces the noise and blade frequency sharp sound of the centrifugal fan, and achieves excellent centrifugal fan noise reduction effect through a simple and low-cost structure.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A centrifugal fan volute with noise reduction effect has an internal space for installing a moving impeller, an air outlet is provided on one side, an air inlet connected to the internal space is provided at the lower end, and a mounting base fixedly connected to the motor is provided at the upper end; wherein, the side wall surface of the internal space is provided with a plurality of circumferentially spaced ribs, wherein the circumferential spacing between adjacent ribs is unequal.

[0007] Preferably, the side wall surface of the internal space is provided with a first rib, a second rib and a third rib distributed at circumferential intervals; wherein, the first rib is close to the air outlet, and the circumferential spacing between the second rib and the third rib is smaller than the circumferential spacing between the second rib and the first rib.

[0008] Preferably, the side wall surface of the internal space is further provided with a fourth rib, and the fourth rib and the third rib are circumferentially spaced apart, wherein the circumferential spacing between the fourth rib and the third rib is greater than the circumferential spacing between the second rib and the third rib.

[0009] Preferably, the side wall surface of the internal space is further provided with a fifth rib, and the fifth rib and the fourth rib are circumferentially spaced apart, wherein the circumferential spacing between the fifth rib and the fourth rib is greater than the circumferential spacing between the fourth rib and the third rib.

[0010] Preferably, the circumferential distance between the fifth rib and the air outlet is greater than the circumferential distance between the first rib and the air outlet.

[0011] Preferably, the circumferential distance between the fifth rib and the air outlet is greater than the circumferential distance between the fifth rib and the fourth rib.

[0012] Preferably, the ribs are integrally formed with the centrifugal fan volute body.

[0013] Preferably, the centrifugal fan volute body includes a volute base and a volute cover; wherein,

[0014] The volute base and the volute cover are fixedly installed to form the air outlet and the internal space;

[0015] The air inlet is provided at the bottom of the volute base;

[0016] The upper end of the volute upper cover is provided with a mounting base fixedly connected to the motor.

[0017] Preferably, the rib is located on the side wall surface of the volute base.

[0018] Preferably, the mounting base is provided with a plurality of mounting bosses connected to the motor.

[0019] The present application arranges a number of circumferentially spaced ribs on the side wall surface of the internal space of the centrifugal fan volute, and the circumferential spacing between adjacent ribs is unequal. Through implementation verification, the rib structure provided by the present application can weaken the pressure pulsation generated by the rotation of the impeller during the operation of the centrifugal fan, and break up the shedding vortex generated by the fluid vortex street at the air inlet, thereby effectively reducing the noise and blade frequency spikes of the centrifugal fan, and achieving excellent centrifugal fan noise reduction effect through a simple and low-cost structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a centrifugal fan volute in a specific embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A top view of the structure;

[0022] Figure 3 yes Figure 1 Schematic diagram of the side structure;

[0023] Figure 4 This is a structural diagram of the lower volute base according to a specific embodiment of the present invention;

[0024] Figure 5 yes Figure 4 A top view of the structure. DETAILED DESCRIPTION

[0025] An embodiment of the utility model discloses a centrifugal fan volute with a noise reduction effect, which has an internal space for installing a moving impeller, an air outlet on one side of the volute, an air inlet connected to the internal space at the lower end of the volute, and a mounting base fixedly connected to the motor at the upper end; wherein, a side wall surface of the internal space is provided with a plurality of circumferentially spaced ribs, wherein the circumferential spacing between adjacent ribs is unequal.

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] See Figure 1 、 Figure 2 、 Figure 3 Combined with Figure 4 and Figure 5 As shown, a centrifugal fan volute with a noise reduction effect includes a centrifugal fan volute body 1, which has an internal space for installing a moving impeller (a known structure, not shown in the figure), an air outlet 2 on one side, an air inlet 3 connected to the internal space at its lower end, and a mounting base 4 fixedly connected to a motor (a known structure, not shown in the figure) at its upper end; wherein, a side wall surface of the internal space is provided with a plurality of circumferentially spaced ribs, wherein the circumferential spacing between adjacent ribs is unequal, and the shapes of the ribs are the same, all being arc-shaped.

[0028] Preferably, in this embodiment, the centrifugal fan volute body 1 includes a volute base 1a and a volute upper

[0029] Cover 1b; wherein, the volute base 1a and the volute upper cover 1b are fixedly installed to form an air outlet 2 and an internal space; the bottom of the volute base 1a is provided with an air inlet 3; the upper end of the volute upper cover 1b is provided with a mounting base 4 fixedly connected to the motor, and the mounting base 4 is provided with a plurality of mounting bosses 41 installed and connected to the motor.

[0030] Preferably, in order to further facilitate the noise reduction effect, in this embodiment, the rib is located on the side wall surface of the volute base 1a; preferably, in order to facilitate the processing and molding effect, in this embodiment, the rib and the volute base 1a are integrally molded.

[0031] Preferably, in this embodiment, the side wall surface of the volute base 1a is provided with a first rib 5a, a second rib 5b and a third rib 5c distributed at circumferential intervals; wherein the first rib 5a is close to the air outlet 2, and the circumferential spacing 5c ​​between the second rib 5b and the third rib is smaller than the circumferential spacing between the second rib 5b and the first rib 5a.

[0032] In order to further benefit the noise reduction effect, preferably, in the present embodiment, the side wall surface of the volute base 1a is further provided with a fourth rib 5d, and the fourth rib 5d and the third rib 5c are circumferentially spaced, wherein the circumferential spacing between the fourth rib 5d and the third rib 5c is greater than the circumferential spacing between the second rib 5b and the third rib 5c; in order to further benefit the noise reduction effect, preferably, in the present embodiment, the side wall surface of the volute base 1a is further provided with a fifth rib 5e, and the fifth rib 5e and the fourth rib 5d are circumferentially spaced, wherein the circumferential spacing between the fifth rib 5e and the fourth rib 5d is greater than the circumferential spacing between the fourth rib 5d and the third rib 5c.

[0033] Preferably, in this embodiment, the circumferential spacing between the fifth rib 5e and the air outlet 2 is greater than the circumferential spacing between the first rib 5a and the air outlet 2; the circumferential spacing between the fifth rib 5e and the air outlet 2 is greater than the circumferential spacing between the fifth rib 5e and the fourth rib 6d.

[0034] In this embodiment, a number of circumferentially spaced ribs are provided on the side wall surface of the volute base 1a, and the circumferential spacing between adjacent ribs is unequal. Through implementation and verification, the rib structure provided by this embodiment can weaken the pressure pulsation generated by the rotation of the impeller during the operation of the centrifugal fan, and break up the shedding vortex generated by the fluid vortex street at the air inlet, thereby effectively reducing the noise and blade frequency spikes of the centrifugal fan, and achieving excellent centrifugal fan noise reduction effect through a simple and low-cost structure.

[0035] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0036] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A centrifugal fan volute with noise reduction effect, having an internal space for installing a moving impeller, characterized in that: An air outlet is provided on one side, an air inlet communicating with the internal space is provided at the lower end, and a mounting base fixedly connected to the motor is provided at the upper end; wherein, the side wall surface of the internal space is provided with a plurality of circumferentially spaced ribs, wherein the circumferential spacing between adjacent ribs is not equal.

2. The centrifugal fan volute with noise reduction effect according to claim 1, characterized in that: The side wall surface of the internal space is provided with a first convex rib, a second convex rib and a third convex rib distributed at circumferential intervals; wherein, the first convex rib is close to the air outlet, and the circumferential spacing between the second convex rib and the third convex rib is smaller than the circumferential spacing between the second convex rib and the first convex rib.

3. The centrifugal fan volute with noise reduction effect according to claim 2, characterized in that: The side wall surface of the internal space is further provided with a fourth rib, and the fourth rib and the third rib are circumferentially spaced apart, wherein the circumferential spacing between the fourth rib and the third rib is greater than the circumferential spacing between the second rib and the third rib.

4. The centrifugal fan volute with noise reduction effect according to claim 3, characterized in that: The side wall surface of the internal space is further provided with a fifth rib, and the fifth rib and the fourth rib are circumferentially spaced apart, wherein the circumferential spacing between the fifth rib and the fourth rib is greater than the circumferential spacing between the fourth rib and the third rib.

5. The centrifugal fan volute with noise reduction effect according to claim 4, characterized in that: The circumferential distance between the fifth rib and the air outlet is greater than the circumferential distance between the first rib and the air outlet.

6. The centrifugal fan volute with noise reduction effect according to claim 5, characterized in that: The circumferential distance between the fifth convex rib and the air outlet is greater than the circumferential distance between the fifth convex rib and the fourth convex rib.

7. The centrifugal fan volute with noise reduction effect according to claim 1, characterized in that: The convex rib and the centrifugal fan volute body are integrally formed.

8. The centrifugal fan volute with noise reduction effect according to claim 1 or 7, characterized in that: The centrifugal fan volute body includes a volute base and a volute cover; wherein, The volute base and the volute cover are fixedly installed to form the air outlet and the internal space; The air inlet is provided at the bottom of the volute base; The upper end of the volute upper cover is provided with a mounting base fixedly connected to the motor.

9. The centrifugal fan volute with noise reduction effect according to claim 8, characterized in that: The convex rib is located on the side wall surface of the volute base.

10. The centrifugal fan volute with noise reduction effect according to claim 1, characterized in that: The mounting base is provided with a plurality of mounting bosses which are mounted and connected to the motor.

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