CN215633906U - Centrifugal fan with silence pressure boost structure - Google Patents

Abstract

The utility model provides a centrifugal fan with a mute pressurization structure, which comprises: the turbine comprises a volute, a turbine, a motor, a rotating shaft and a motor bracket. Wherein, motor support passes through flexible connectors fixed mounting inside the volute, and the motor is installed on motor support, and the pivot is rotated and is installed on motor support, and is connected with the motor, and the motor drives the pivot and rotates. The turbine is arranged in the volute, fixed at one end or two ends of the rotating shaft and used for rotating and supplying air under the driving of the rotating shaft. And a flexible connecting piece is arranged at the position of the volute connected with the external fixing structure and used for reducing the transmission of vibration. The vibration reduction structure is arranged in the centrifugal fan, rigid contact is avoided, vibration generation and transmission efficiency are greatly reduced, and noise is reduced. In addition, the turbine and the volute are matched through a dynamic sealing structure, the pressure inside the volute of the centrifugal fan can be increased, the air pressure leakage is effectively reduced, and the air supply efficiency is greatly improved.

Description

Centrifugal fan with silence pressure boost structure

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan with a silencing pressurization structure.

Background

At present, centrifugal fans in the market are widely applied and play an important role in production and life. During the use, centrifugal fan's operation can bring vibration and noise, and the noise can influence the quality of people's production, living environment, and the vibration can lead to centrifugal fan structure to damage or become flexible, reduces centrifugal fan's life. The existing centrifugal fan on the market generally reduces the vibration of the centrifugal fan by improving the precision and the installation precision of a rotating shaft, and then reduces the noise. However, although this has a certain damping effect, the lift is not large and the cost is too high. Higher costs are required to achieve further damping and noise reduction. In addition, in the air supply process, the volute dynamic seal of the centrifugal fan is also an important condition for improving the internal pressure of the centrifugal fan and improving the air supply efficiency.

Therefore, a centrifugal fan with simple structure, vibration reduction, noise reduction, low cost, high air supply efficiency and internal pressure improvement is needed in the field.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a centrifugal fan with a silencing pressurization structure. This centrifugal fan has reduced the production and the transmission efficiency of vibration greatly through having set up the damping structure, and then has reduced the noise. And the cooperation between turbine and the volute can promote the inside pressure of centrifugal fan volute, effectively reduces atmospheric pressure and leaks, has promoted air supply efficiency greatly.

The utility model provides a centrifugal fan with a mute pressurization structure, which comprises: this centrifugal fan includes: the device comprises a volute 1, a turbine 2, a motor 3, a rotating shaft 4 and a motor support 5, wherein the motor support 5 is fixedly installed inside the volute 1 through a flexible connecting piece 6, the motor 3 is installed on the motor support 5, the rotating shaft 4 is rotatably installed on the motor support 5 and is connected with the motor 3, and the motor 3 drives the rotating shaft 4 to rotate; the turbine 2 is arranged in the volute 1, fixed at one end or two ends of the rotating shaft 4 and used for rotating and supplying air under the driving of the rotating shaft 4; and a flexible connecting piece 6 is arranged at the position of the volute 1 connected with the external fixed structure and used for reducing the transmission of vibration.

In an embodiment of the present invention, the turbine 2 includes: a hub 21, blades 22 and a rim 23, wherein the hub 21 is fixedly mounted on the rotating shaft 4; a plurality of blades 22 are evenly distributed around hub 21; the rim 23 is located at the periphery of the blades 22 for fixing the blades 22.

Further, the turbine 2 is installed at the end of the rotating shaft 4, wherein a clamp spring 7 is arranged on one side of the hub 21 close to the end of the rotating shaft 4 and used for axially limiting the hub 21; the other side of the hub 21 is provided with a spring 8, and the spring 8 is sleeved outside the rotating shaft 4 and used for providing elastic supporting force for the turbine 2.

In the embodiment of the utility model, the rim 23 is provided with a U-shaped groove ring 24 at the outer edge, the air inlet of the volute 1 is provided with a wind-blocking ring 11, and the wind-blocking ring 11 extends to the inside of the U-shaped groove ring 24 and is used for realizing dynamic sealing by matching with the U-shaped groove ring 24.

Further, the edge of the air inlet is also provided with an annular sealing ring 12, and the annular sealing ring 12 is located at the periphery of the wind blocking ring 11 and the U-shaped groove ring 24 and is used for being matched with the U-shaped groove ring 24 to realize dynamic sealing.

In another embodiment, the rim of the air inlet has a sealing ring groove 13, and the outer rim of the rim 23 extends into the sealing ring groove 13 for realizing the dynamic sealing of the volute 1 and the turbine 2.

In the embodiment of the utility model, the flexible connecting piece 6 is a cylindrical body, and the middle of the flexible connecting piece is provided with an annular groove, wherein a central hole of the flexible connecting piece 6 is internally provided with a milk nail 61 for reducing the transmission efficiency of vibration; the top surface and the bottom surface of the outer part of the flexible connecting piece 6 and the upper surface and the lower surface of the annular groove are provided with milk nails 61 for reducing the transmission efficiency of vibration; the outer ring of the flexible joint member 6 has columnar projections 62 for reducing the transmission efficiency of vibration.

In the embodiment of the present invention, the motor 3 is externally provided with a motor closure 31 for protecting the motor 3.

In the embodiment of the utility model, one side of the scroll 1 is an air inlet, and the shell at the other side of the scroll 1 is provided with an air inlet hole 14 for air inlet of the fan.

In the embodiment of the utility model, the volute 1 comprises an upper shell 15 and a lower shell 16, wherein the upper shell 15 is connected with the lower shell 16 in a buckling or screw mode; the volute 1 has a fixed support 17 connected with an external fixed structure, and the fixed support 17 is provided with a flexible connecting piece 6 for reducing the transmission of vibration.

According to the above embodiments, the centrifugal fan with the silencing and pressurizing structure provided by the utility model has the following advantages. Compared with the existing centrifugal fan, the centrifugal fan is internally provided with a plurality of vibration reduction structures, so that the vibration generation and the vibration transmission efficiency can be greatly reduced, the noise is reduced, and the service life of the fan is prolonged. In addition, the outer ring of the turbine and the air port of the volute are installed in a matched mode through a dynamic sealing structure, so that the air pressure can be effectively reduced from leaking, the pressure inside the volute of the centrifugal fan is improved, and the air supply efficiency is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a cross-sectional view of a centrifugal fan with a silencing and pressurizing structure according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a centrifugal fan with a silencing and pressurizing structure according to a first embodiment of the present invention

Fig. 3 is a sectional view of a centrifugal fan with a silencing and pressurizing structure according to a second embodiment of the present invention.

Fig. 4 is a cross-sectional view of a centrifugal fan with a silencing and pressurizing structure according to a third embodiment of the present invention.

Fig. 5 is a cross-sectional view of a centrifugal fan with a silencing and pressurizing structure according to a fourth embodiment of the present invention.

Fig. 6 is a cross-sectional view of a fifth embodiment of a centrifugal fan with a silencing pressurization structure according to the present invention.

Fig. 7 is a sectional view of a centrifugal fan with a silencing and pressurizing structure according to a sixth embodiment of the present invention.

Fig. 8 is a sectional view of a seventh embodiment of a centrifugal fan with a silencing pressurization structure according to the present invention.

Fig. 9 is an external structural view of an embodiment eight of the centrifugal fan with a silencing and supercharging structure provided by the utility model.

Fig. 10 is a cross-sectional view of a centrifugal fan with a silencing and pressurizing structure according to a ninth embodiment of the present invention.

Fig. 11 is a cross-sectional view of a centrifugal fan with a silencing and pressurizing structure according to an embodiment of the present invention.

Fig. 12 is a cross-sectional view of an eleventh embodiment of a centrifugal fan having a squelch boost structure provided by the present invention.

Fig. 13 is a cross-sectional view of a centrifugal fan with a squelch boost structure according to an embodiment twelve of the present invention.

Fig. 14 is a cross-sectional view of a centrifugal fan with a silencing and pressurizing structure according to a thirteenth embodiment of the present invention.

Fig. 15 is a cross-sectional view of a fourteenth embodiment of a centrifugal fan having a squelch boost structure according to the present invention.

Fig. 16 is a cross-sectional view of a fifteenth embodiment of a centrifugal fan with a squelch boost structure provided by the utility model.

Fig. 17 is a cross-sectional view of a centrifugal fan with a squelch boost configuration according to a sixteenth embodiment of the present invention.

Fig. 18 is a structural diagram of a flexible connector of a centrifugal fan with a silencing pressurization structure provided by the utility model.

Fig. 19 is a sectional view of a flexible connection unit of a centrifugal fan having a squelch boost structure provided by the present invention.

Fig. 20 is a structural view of a turbine of a centrifugal fan having a squelch boost structure provided by the present invention.

Fig. 21 is a top view of a turbine of a centrifugal fan having a squelch boost structure provided by the present invention.

Description of reference numerals:

1-volute, 2-turbine, 3-motor, 4-rotating shaft, 5-motor support, 6-flexible connecting piece, 7-snap spring and 8-spring;

11-a wind shield ring, 12-an annular sealing ring, 13-a sealing ring groove, 14-an air inlet hole, 15-an upper shell, 16-a lower shell and 17-a fixed support;

21-hub, 22-blade, 23-rim, 24-U-shaped groove ring, 25-lightening hole and 26-reinforcing structure;

31-motor enclosure;

61-milk nail, 62-column protrusion.

Detailed Description

Reference will now be made in detail to various exemplary embodiments of the utility model, the detailed description should not be construed as limiting the utility model but as a more detailed description of certain aspects, features and embodiments of the utility model.

It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The specification and examples are exemplary only.

The utility model provides a centrifugal fan with a mute pressurization structure, which specifically comprises: a volute 1, a turbine 2, a motor 3, a rotating shaft 4 and a motor bracket 5. Wherein, as shown in fig. 1, motor support 5 is through inside a plurality of flexible connectors 6 fixed mounting at volute 1, and flexible connectors 6 can realize the effect of damping, greatly reduced vibration transmission's efficiency. The motor 3 is installed on the motor support 5, and the pivot 4 rotates and installs on the motor support 5, and is connected with the motor 3, and the motor 3 drives the pivot 4 and rotates.

The turbine 2 is arranged inside the volute 1 and fixed at the end of the rotating shaft 4, and is driven by the rotating shaft 4 to rotate for air supply. In one embodiment, a turbine 2 is fixedly mounted at one end of the rotating shaft 4. In another embodiment, the turbine 2 is mounted on both ends of the rotating shaft 4.

The position of connecting outside fixed knot structure on the volute 1 is provided with flexible connection 6, and flexible connection 6 is used for reducing the transmission efficiency of vibration.

In an embodiment of the present invention, as shown in fig. 20, the turbine 2 includes: hub 21, blades 22 and rim 23. Wherein the hub 21 is fixedly mounted on the rotating shaft 4. A plurality of blades 22 are evenly distributed around hub 21. The rim 23 is located at the periphery of the blades 22 for fixing the blades 22. In addition, the hub 21, the blades 22 and the rim 23 are integrally formed, thereby enhancing the overall structural strength of the turbine 2. In addition, as shown in fig. 21, the hub 21 is provided with lightening holes 25 for lightening the weight of the hub and improving the rotating efficiency. The turbine 2 is also provided with a reinforcing structure 26, and the reinforcing structure 26 is connected with the blades and used for reinforcing the strength of the blades 22 and preventing the blades 22 from deforming to influence the air supply efficiency in the rotating process of the turbine 2.

As shown in fig. 1, the turbine 2 is mounted on the end of a rotating shaft 4. Wherein, the side that wheel hub 21 is close 4 tip of pivot is provided with jump ring 7 for carry out axial spacing to wheel hub 21. The other side of the hub 21 is provided with the spring 8, and the spring 8 is sleeved outside the rotating shaft 4 and used for providing elastic supporting force for the turbine 2, so that the turbine can float up and down in the axial direction, and vibration transmission caused by rigid connection is reduced. In addition, the turbine 2 floating up and down can make the turbine 2 adjust the height adaptively according to different rotating speeds and environments in the rotating process, so that the rotation of the turbine 2 is more adaptive to the changes of the rotating speeds and the environments, and further, the generation of noise and vibration can be reduced.

In addition, a motor closing case 31 is provided outside the motor 3, and the motor closing case 31 protects the motor 3 from being damaged by an external force.

In the embodiment of the present invention, as shown in fig. 1, the scroll 1 includes an upper casing 15 and a lower casing 16. The upper shell 15 and the lower shell 16 are connected by a snap or a screw. Make things convenient for the dismantlement of casing and fan inner structure's installation and later maintenance. It should be understood that one side of the upper shell 15 of the scroll 1 is the front side of the scroll 1, and one side of the lower shell 16 of the scroll 1 is the back side of the scroll 1.

As shown in fig. 2, the scroll 1 has a fixing bracket 17 connected to an external fixing structure, and the fixing bracket 17 is provided with a flexible connecting member 6 for reducing the transmission of vibration. The fixed bolster 17 that sets up on casing 1 extends casing 1 outside, can promote the stability of fan when operation like this, avoids too big rocking.

In the embodiment shown in fig. 1, the rim 23 has a U-shaped groove ring 24 on the outer edge, and the U-shaped groove ring 24 extends away from the axial center. The air intake of volute 1 is provided with wind-break circle 11, and wind-break circle 11 sets up in the lower part of U type groove ring 24, and wind-break circle 11 extends to the inside of U type groove ring 24 for with the cooperation of U type groove ring 24, realize the dynamic seal when turbine 2 rotates, promote the inside pressure of volute 1, promote air-out efficiency. Specifically, the U-shaped groove ring 24 and the rim 23 are integrally formed, so that the structural strength is improved. The wind-break ring 11 and the volute 1 are integrally formed, and the strength of the structure is improved.

In addition, the edge of the air inlet is also provided with an annular sealing ring 12, the annular sealing ring 12 is positioned at the periphery of the wind blocking ring 11 and the U-shaped groove ring 24, namely the outer ring of the U-shaped groove ring 24 is positioned between the annular sealing ring 12 and the wind blocking ring 11 and is used for realizing dynamic sealing by matching with the U-shaped groove ring 24. Specifically, the annular sealing ring 12 and the volute 1 are integrally formed, so that the structural strength is improved.

In the embodiment of the present invention, as shown in fig. 18, the flexible connecting member 6 is a cylindrical body having an annular groove in the middle. As shown in fig. 19, the flexible connecting member 6 has a nipple 61 in the central hole for reducing the contact area and the transmission efficiency of vibration.

The top surface and the bottom surface of the outer part of the flexible connecting piece 6 and the upper surface and the lower surface of the annular groove are provided with milk nails 61 for reducing the contact surface and the transmission efficiency of vibration.

In addition, the outer ring of the flexible connecting piece 6 is provided with a columnar protrusion 62, and the columnar protrusion 62 is arranged on the outer ring of the flexible connecting piece 6 in parallel with the central line of the flexible connecting piece 6, so as to reduce the contact area and reduce the transmission efficiency of vibration.

In the embodiment shown in fig. 3, the difference between the embodiment and the embodiment shown in fig. 1 is that in the present embodiment, a motor cover 31 is not provided outside the motor 3 for reducing the weight of the fan.

In the embodiment shown in fig. 4, the annular seal 12 of the volute 1 is eliminated in comparison with the embodiment shown in fig. 3.

In the embodiment shown in fig. 5, the rim of the air inlet has a sealing ring groove 13, and the outer rim of the rim 23 extends into the sealing ring groove 13, so as to realize dynamic sealing between the scroll casing 1 and the turbine 2, increase the pressure inside the scroll casing 1, and improve the air outlet efficiency. The present embodiment is different from the embodiment shown in fig. 4 in the change of the dynamic seal structure between the scroll 1 and the turbine 2. In this embodiment, the cross section of the seal ring groove 13 on the air inlet of the volute 1 is U-shaped, and faces the inside of the volute 1, and the rim outer edge of the turbine 2 extends into the seal ring groove 13. In this embodiment, the air inlet of the scroll 1 has no protrusion, and the seal groove 13 extends toward the inside of the scroll 1. Specifically, the seal ring groove 13 and the scroll 1 are integrally formed, so that the structural strength is improved.

In the embodiment shown in fig. 6, the embodiment is different from the embodiment shown in fig. 5 in that the seal ring groove 13 at the air inlet is protruded outward in the axial direction, and the opening of the seal ring groove 13 is directed toward the inside of the scroll 1. The outer edge of the rim 23 extends into the sealing ring groove 13, so that dynamic sealing between the volute 1 and the turbine 2 is realized, the pressure inside the volute 1 is increased, and the air outlet efficiency is improved.

In the embodiment shown in fig. 7, the sealing ring groove 13 at the air inlet of the scroll 1 is an arc-shaped groove and extends toward the inside of the scroll 1. In addition, the outer edge of rim 23 is the arc outer edge, and the arc outer edge extends to the direction of keeping away from the pivot, and the cooperation is followed outward to curved seal groove 13 and curved rim 23, realizes the dynamic seal, promotes the inside pressure of volute 1, promotes air-out efficiency.

As shown in the embodiment shown in fig. 8, the embodiment is different from the embodiment shown in fig. 6 in that the outer edge of the rim 23 in the embodiment is an arc-shaped outer edge, and the arc-shaped outer edge extends to a direction close to the rotating shaft, and the arc-shaped outer edge of the rim 23 extends into the sealing ring groove 13, so as to achieve dynamic sealing between the scroll casing 1 and the turbine 2, increase the pressure inside the scroll casing 1, and increase the air outlet efficiency.

In the embodiment shown in fig. 9, one side of the scroll 1 is an air inlet, and the casing on the other side of the scroll 1 has air inlet holes 14, and the air inlet holes 14 are used for air inlet of the fan. The difference between this embodiment and the embodiment shown in fig. 2 is that the bottom of the volute 1 is provided with a plurality of air inlet holes 14 for increasing the air inlet amount of the centrifugal fan.

In the embodiment shown in fig. 10, this embodiment differs from the embodiment shown in fig. 2 in that in the embodiment shown in fig. 2, the turbine 2 is connected to the volute 1 by three flexible connections, i.e. in the embodiment shown in fig. 2, the turbine 2 has three connection support points. In this embodiment, the turbine 2 is connected to the volute 1 through four flexible connectors 6, that is, in this embodiment, the turbine 2 has four connection support points, which greatly improves the structural stability of the connection.

In the embodiment shown in fig. 11, the difference between the embodiment and the embodiment shown in fig. 1 is that the fixed connection position of the scroll 1 is set at the back of the scroll 1, and the fixed bracket 17 in the embodiment shown in fig. 1 is not used for connection. Namely, a plurality of flexible connecting pieces 16 are fixedly arranged on the back surface of the volute casing 1. The back of the volute 1 is fixedly connected with an external fixing piece, and the fan is fixedly installed. It should be understood that one side of the upper shell 15 of the scroll 1 is the front side of the scroll 1, and one side of the lower shell 16 of the scroll 1 is the back side of the scroll 1.

In the embodiment shown in fig. 12, the difference between the embodiment and the embodiment shown in fig. 11 is that the fixed connection position of the scroll 1 is arranged on the front surface of the scroll 1, i.e. the fixed connection position among the plurality of flexible connecting pieces 16 is fixedly arranged on the front surface of the scroll 1, the front surface of the scroll 1 is fixedly connected with an external fixing piece, and the fan is fixedly arranged.

In the embodiment shown in fig. 13, the difference between the embodiment and the embodiment shown in fig. 11 is that the front surface of the scroll 1 also has a fixed connection position, that is, the front surface of the scroll 1 is also provided with a plurality of flexible connection members 16, so that both the front surface and the back surface of the scroll 1 can be fixedly connected with an external fixing member to fixedly mount the fan.

In the embodiment shown in fig. 14, two turbines 2 are disposed inside the scroll 1 and fixed at two ends of the rotating shaft 4 respectively, and are driven by the rotating shaft 4 to rotate and supply air, so as to greatly increase the air supply amount of the fan. In this embodiment, the scroll 1 and the turbines 2 on both sides have dynamic seal structures. And both side surfaces of the scroll 1 and the turbine 2 are provided with dynamic sealing structures. The wind-blocking ring 11 on the volute 1 extends into the U-shaped groove ring 24 on the rim 23 to realize dynamic sealing and improve the pressure in the volute 1.

The motor 3 is arranged between the two turbines 2, the motor 3 is connected with the volute 1 through the motor support 5, the flexible connecting piece 6 is arranged at the connecting position, and the transmission efficiency of vibration is greatly reduced.

In addition, in this embodiment, the scroll casing 1 is a split scroll casing, each scroll casing fixedly wraps one turbine 2, and the two scroll casings 1 are fixed together to form a double-turbine fan.

In the embodiment shown in fig. 15, the difference between this embodiment and the embodiment shown in fig. 14 is that in this embodiment, the scroll 1 is a one-piece scroll casing, and both the turbines 2 are disposed inside the scroll 1. And a dynamic sealing mechanism is arranged between the air inlets at the two ends of the volute 1 and the rims 23 of the turbines 2 at the two sides, and is used for improving the pressure inside the volute 1 and improving the air supply efficiency.

In the embodiment shown in fig. 16, the difference between this embodiment and the embodiment shown in fig. 15 is the difference between the turbines 2. In the embodiment, the axial length of the turbine 2 is shortened, so that the length of the fan is shortened, the volume of the fan is reduced, and the fan can adapt to different application scenes.

In the embodiment shown in fig. 17, the difference between this embodiment and the embodiment shown in fig. 15 is the difference between the turbines 2. In this embodiment, a reinforcing structure is arranged between the blades of the turbine 2, and the blades 22 are prevented from deforming when the turbine 2 rotates by the reinforcing structure 26, so that the structural strength of the blades is improved. Specifically, the reinforcing structure 26 is a reinforcing rod that is connected to the plurality of blades 22 to increase the strength of the blades 22.

The foregoing is merely an illustrative embodiment of the present invention, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principle of the present invention should fall within the protection scope of the present invention.

Claims (10)

1. Centrifugal fan with silence pressure boost structure, its characterized in that, this centrifugal fan includes: a volute (1), a turbine (2), a motor (3), a rotating shaft (4) and a motor bracket (5), wherein,

the motor support (5) is fixedly arranged inside the volute (1) through a flexible connecting piece (6), the motor (3) is arranged on the motor support (5), the rotating shaft (4) is rotatably arranged on the motor support (5) and is connected with the motor (3), and the motor (3) drives the rotating shaft (4) to rotate;

the turbine (2) is arranged in the volute (1), fixed at one end or two ends of the rotating shaft (4) and driven by the rotating shaft (4) to rotate for air supply; and

the flexible connecting piece (6) is arranged at the position, connected with an external fixing structure, on the volute (1) and used for reducing the transmission of vibration.

2. The centrifugal fan with a squelch boost structure as claimed in claim 1, characterized in that said turbine (2) comprises: a hub (21), blades (22) and a rim (23), wherein,

the hub (21) is fixedly arranged on the rotating shaft (4); a plurality of said blades (22) being evenly distributed around said hub (21); the rim (23) is positioned at the periphery of the blades (22) and is used for fixing the blades (22).

3. The centrifugal fan with the silencing and pressurizing structure as recited in claim 2, wherein the turbine (2) is mounted at the end of the rotating shaft (4), and a clamp spring (7) is arranged on one side of the hub (21) close to the end of the rotating shaft (4) and used for axially limiting the hub (21);

and a spring (8) is arranged on the other side of the hub (21), and the spring (8) is sleeved outside the rotating shaft (4) and used for providing elastic supporting force for the turbine (2).

4. The centrifugal fan with the silencing and pressurizing structure as recited in claim 2, wherein the outer edge of the rim (23) is provided with a U-shaped groove ring (24), the air inlet of the volute (1) is provided with a wind blocking ring (11), and the wind blocking ring (11) extends to the inside of the U-shaped groove ring (24) for realizing dynamic sealing by matching with the U-shaped groove ring (24).

5. The centrifugal fan with the silencing and pressurizing structure as recited in claim 4, wherein the air inlet edge is further provided with an annular sealing ring (12), and the annular sealing ring (12) is located at the periphery of the wind shielding ring (11) and the U-shaped groove ring (24) and is used for realizing dynamic sealing in cooperation with the U-shaped groove ring (24).

6. The centrifugal fan with the silencing and pressurizing structure as recited in claim 2, wherein the air inlet edge is provided with a sealing ring groove (13), and the outer edge of the rim (23) extends into the sealing ring groove (13) for realizing the dynamic sealing of the volute (1) and the turbine (2).

7. The centrifugal fan with a silencing and pressurizing structure according to claim 1, wherein the flexible connecting member (6) is a cylindrical body with an annular groove in the middle, wherein,

the center hole of the flexible connecting piece (6) is internally provided with a milk nail (61) for reducing the transmission efficiency of vibration;

the top surface and the bottom surface of the outer part of the flexible connecting piece (6) and the upper surface and the lower surface of the annular groove are provided with the milk nails (61) for reducing the transmission efficiency of vibration;

the outer ring of the flexible connecting piece (6) is provided with a columnar bulge (62) for reducing the transmission efficiency of vibration.

8. The centrifugal fan with a silent booster structure according to claim 1, characterized in that the motor (3) is externally provided with a motor closing case (31) for protecting the motor (3).

9. The centrifugal fan with the silencing and pressurizing structure as recited in claim 1, wherein the volute (1) has an air inlet on one side, and the housing on the other side of the volute (1) has an air inlet hole (14) for air inlet of the fan.

10. The centrifugal fan with the silencing and pressurizing structure as recited in claim 1, wherein the volute (1) comprises an upper shell (15) and a lower shell (16), and the upper shell (15) is connected with the lower shell (16) in a buckling or screw mode;

the volute (1) is provided with a fixed support (17) connected with an external fixed structure, and the flexible connecting piece (6) is arranged on the fixed support (17) and used for reducing the transmission of vibration.

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