A centrifugal fan

Abstract

The present application proposes a centrifugal fan, comprising: a body; an impeller, which is rotatably arranged on the body; a motor, which is arranged on the body and is provided with a drive shaft; a support seat, which is located between the body and the motor and connects the body and the motor, and has a support hole, which passes through the support seat in front and back; a transmission shaft, which is rotatably arranged in the support hole, the first end of the transmission shaft is connected to the drive shaft, and the second end of the transmission shaft is connected to the impeller; a first bearing, which is arranged in the support hole and is located on a side close to the first end of the transmission shaft, and the inner hole of the first bearing cooperates with the transmission shaft so that the inner ring of the first bearing rotates with the transmission shaft; a second bearing, which is arranged in the support hole and is located on a side close to the second end of the transmission shaft, and the inner hole of the second bearing cooperates with the transmission shaft so that the inner ring of the second bearing rotates with the transmission shaft. The centrifugal fan of the utility model can simplify the structure, reduce the cost, and is more convenient to maintain.

Description

Technical Field

[0001] The present application relates to a fan, and in particular to a centrifugal fan. Background Art

[0002] Centrifugal fans are a type of mechanical equipment widely used in industry, construction and life. Their function is to achieve ventilation, air exchange, circulation and removal of pollutants by forcibly guiding airflow.

[0003] At present, centrifugal fans on the market mainly include a body, an impeller and a driving mechanism. The impeller is rotatably arranged in the body, and the driving mechanism is arranged on the body and connected to the impeller. The impeller is driven to rotate by the driving mechanism to guide the airflow. However, the driving mechanism in the centrifugal fans on the market generally includes a motor, a belt transmission mechanism and a bearing. The input shaft of the impeller is supported by two bearings, and the structure is complex, the number of components is large, the cost is high, and it is inconvenient to maintain. Utility Model Content

[0004] The embodiment of the present application provides a centrifugal fan to solve the problems existing in the related technology. The technical solution is as follows:

[0005] In a first aspect, an embodiment of the present application provides a centrifugal fan, comprising:

[0006] Body;

[0007] An impeller, the impeller being rotatably disposed on the machine body;

[0008] A motor, wherein the motor is arranged on the machine body and a driving shaft is arranged on the motor;

[0009] A support base, the support base is located between the machine body and the motor and connects the machine body and the motor, the support base has a support hole, and the support hole passes through the support base both front and back;

[0010] A transmission shaft, the transmission shaft is rotatably disposed in the support hole, a first end of the transmission shaft is connected to the drive shaft, and a second end of the transmission shaft is connected to the impeller;

[0011] a first bearing, the first bearing being disposed in the support hole and located on a side close to the first end of the transmission shaft, the inner hole of the first bearing being matched with the transmission shaft so that the inner ring of the first bearing rotates with the transmission shaft;

[0012] The second bearing is arranged in the support hole and is located on a side close to the second end of the transmission shaft. The inner hole of the second bearing cooperates with the transmission shaft so that the inner ring of the second bearing rotates with the transmission shaft.

[0013] In one embodiment, the support seat is provided with a support tube, a first annular connecting portion and a second annular connecting portion, the support tube has the support hole, the first annular connecting portion and the second annular connecting portion are placed at both ends of the support tube, the first annular connecting portion has a plurality of first connecting holes, the plurality of first connecting holes are arranged at intervals around the support hole, the second annular connecting portion has a plurality of second connecting holes, the plurality of second connecting holes are arranged at intervals around the support hole;

[0014] The motor has a plurality of first threaded holes;

[0015] The body has a plurality of second threaded holes;

[0016] The centrifugal fan also includes:

[0017] A plurality of first fastening screws, wherein the rods of the first fastening screws are sequentially provided with the corresponding first connecting holes and the first threaded holes and are threadedly connected with the first threaded holes, and the heads of the first fastening screws abut against one end of the first annular connecting portion away from the motor;

[0018] A plurality of second fastening screws, wherein the rods of the second fastening screws are sequentially penetrated through the corresponding second connecting holes and the second threaded holes and are threadedly connected with the second threaded holes, and the heads of the second fastening screws and one end of the second annular connecting portion facing away from the machine body are abutted against each other.

[0019] In one embodiment, a plurality of support plates are further provided on the support seat, and the support plates are provided on the outer peripheral wall of the support tube. The support plates connect the first annular connecting portion and the second annular connecting portion, and the plurality of support plates are arranged at intervals around the axial center line of the support tube.

[0020] In one embodiment, the support hole includes a first hole segment and a second hole segment, the first hole segment and the second hole segment are sequentially arranged along the axial direction of the support hole, the aperture of the first hole segment is smaller than the aperture of the second hole segment to form a limiting step end face therebetween, the limiting step end face abuts against the outer end of the outer ring of the first bearing, and the outer ring of the first bearing and the outer ring of the second bearing are both clearance-matched with the second hole segment;

[0021] The centrifugal fan also includes:

[0022] A fastening nut, wherein the fastening nut is sleeved on the transmission shaft and threadedly connected to the transmission shaft, and the fastening nut abuts against an outer end of an inner ring of the first bearing;

[0023] A limiting sleeve, the limiting sleeve is arranged on the transmission shaft, the limiting sleeve is located between the first bearing and the second bearing, one end of the limiting sleeve abuts against the inner end of the inner ring of the first bearing, and the other end of the limiting sleeve abuts against the inner end of the inner ring of the second bearing;

[0024] An annular limiting portion, the annular limiting portion is arranged on the transmission shaft, and the annular limiting portion and the outer end of the inner ring of the second bearing abut against each other;

[0025] A limit cover is arranged on the end of the support seat, the limit cover and the outer end of the outer ring of the second bearing are abutted against each other, and the limit cover has an avoidance hole, the avoidance hole is for the second end of the transmission shaft to pass through and is clearance-matched with the transmission shaft.

[0026] In one embodiment, the annular limiting portion and the transmission shaft are integrally provided together.

[0027] In one embodiment, the transmission shaft has a third connecting hole and a first keyway, the third connecting hole is located on the first end of the transmission shaft, and the first keyway is located on the hole wall of the third connecting hole;

[0028] The driving shaft is inserted into the third connecting hole, and the driving shaft has a second keyway;

[0029] The centrifugal fan further includes a first transmission key, which is disposed between the first keyway and the second keyway to connect the drive shaft and the transmission shaft together.

[0030] In one embodiment, the impeller has a fourth connecting hole and a third keyway, and the third keyway is located on the hole wall of the fourth connecting hole;

[0031] The transmission shaft has a fourth keyway;

[0032] The centrifugal fan further includes a second transmission key, which is disposed between the third keyway and the fourth keyway to connect the transmission shaft and the impeller together.

[0033] In one embodiment, the body comprises:

[0034] a volute housing the impeller;

[0035] A first mounting shell, wherein the first mounting shell is connected to the volute, the first mounting shell and the volute are arranged in sequence along the width direction of the machine body, the first mounting shell has a first mounting cavity, the opening of the first mounting cavity is located on the side away from the volute, and the first mounting cavity accommodates the motor and the support seat.

[0036] In one embodiment, the centrifugal fan further comprises:

[0037] A radiator is connected to the first mounting shell and is disposed below the first mounting shell, and the radiator and the volute are against each other.

[0038] In one embodiment, the centrifugal fan further comprises:

[0039] A support frame is arranged on the bottom wall of the first installation cavity close to the radiator, the support frame supports the motor, and the support frame is a structure made of heat-conducting material.

[0040] In one embodiment, the body further comprises:

[0041] The second mounting shell is connected to the first mounting shell and is arranged below the first mounting shell. The second mounting shell has a second accommodating cavity, and the second accommodating cavity accommodates the radiator.

[0042] The advantages or beneficial effects of the above technical solution include at least:

[0043] The centrifugal fan of the utility model connects the driving shaft and impeller of the motor through the transmission shaft, so as to realize the transmission connection between the motor and the impeller. When the motor is started, the driving shaft rotates to drive the transmission shaft to rotate, and the transmission shaft rotates to drive the impeller to rotate. At the same time, the arrangement of the first bearing and the second bearing can support the transmission shaft, so that the rotation of the transmission shaft is more stable, and can also reduce the friction coefficient during the rotation of the transmission shaft, so that the rotation of the transmission shaft is smoother. In addition, the support seat located between the machine body and the motor and connecting the machine body and the motor can strengthen the connection stability between the motor and the machine body, so that the operation of the centrifugal fan is more stable. In summary, the direct connection structure composed of the transmission shaft, the support seat, the first bearing and the second bearing replaces the belt transmission mechanism in the prior art, so that the overall structure of the centrifugal fan is more compact, the cost is lower, and it is more convenient to maintain.

[0044] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0046] Figure 1It is a schematic diagram of the three-dimensional structure of the centrifugal fan of the utility model in a first viewing angle;

[0047] Figure 2 It is a cross-sectional view of the centrifugal fan of the utility model at a second viewing angle;

[0048] Figure 3 It is a cross-sectional view of the centrifugal fan of the utility model at a third viewing angle;

[0049] Figure 4 for Figure 3 A partial enlarged view of point A in the figure.

[0050] Reference numerals

[0051] 1. Machine body; 11. Volute; 12. First mounting shell; 121. First mounting cavity; 13. Second mounting shell; 2. Impeller; 3. Motor; 31. Drive shaft; 4. Support seat; 41. Support cylinder; 411. Support hole; 412. End face of limiting step; 42. First annular connecting part; 43. Second annular connecting part; 44. Support plate; 5. Transmission shaft; 51. Annular limiting part; 6. First bearing; 7. Second bearing; 8. Fastening nut; 9. Limiting sleeve; 10. Limiting cover; 20. Radiator; 30. Support frame. DETAILED DESCRIPTION

[0052] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0053] See also Figure 1-Figure 4 , shows a centrifugal fan of a preferred embodiment of the utility model, comprising:

[0054] Body 1;

[0055] An impeller 2 is rotatably disposed on the machine body 1;

[0056] A motor 3, the motor 3 is arranged on the machine body 1, and a driving shaft 31 is arranged on the motor 3;

[0057] A support base 4, the support base 4 is located between the machine body 1 and the motor 3 and connects the machine body 1 and the motor 3, the support base 4 has a support hole 411, and the support hole 411 penetrates the support base 4 from front to back;

[0058] A transmission shaft 5, the transmission shaft 5 is rotatably disposed in the support hole 411, a first end of the transmission shaft 5 is connected to the drive shaft 31, and a second end of the transmission shaft 5 is connected to the impeller 2;

[0059] A first bearing 6, which is disposed in the support hole 411 and is located on a side close to the first end of the transmission shaft 5, and an inner hole of the first bearing 6 cooperates with the transmission shaft 5 so that the inner ring of the first bearing 6 rotates with the transmission shaft 5;

[0060] The second bearing 7 is arranged in the support hole 411 and is located on a side close to the second end of the transmission shaft 5 . The inner hole of the second bearing 7 cooperates with the transmission shaft 5 so that the inner ring of the second bearing 7 rotates with the transmission shaft 5 .

[0061] The centrifugal fan of the utility model connects the driving shaft 31 and the impeller 2 of the motor 3 through the transmission shaft 5, so as to realize the transmission connection between the motor 3 and the impeller 2. When the motor 3 is started, the driving shaft 31 rotates to drive the transmission shaft 5 to rotate, and the transmission shaft 5 rotates to drive the impeller 2 to rotate; at the same time, the setting of the first bearing 6 and the second bearing 7 can support the transmission shaft 5, so that the rotation of the transmission shaft 5 is more stable, and can also reduce the friction coefficient during the rotation of the transmission shaft 5, so that the rotation of the transmission shaft 5 is smoother; in addition, the support seat 4 located between the body 1 and the motor 3 and connecting the body 1 and the motor 3 can strengthen the connection stability between the motor 3 and the body 1, so that the operation of the centrifugal fan is more stable; in summary, the direct connection structure composed of the transmission shaft 5, the support seat 4, the first bearing 6 and the second bearing 7 replaces the belt transmission mechanism in the prior art, simplifies the structure, and makes the overall structure of the centrifugal fan more compact, lower in cost, and more convenient to maintain.

[0062] See also Figure 1 In one embodiment, a support tube 41, a first annular connecting portion 42, and a second annular connecting portion 43 are provided on the support seat 4. The support tube 41 has the above-mentioned support hole 411. The first annular connecting portion 42 and the second annular connecting portion 43 are respectively disposed at both ends of the support tube 41. The first annular connecting portion 42 and the motor 3 are against each other. The first annular connecting portion 42 has a plurality of first connecting holes (not shown in the figure). The plurality of first connecting holes are arranged at intervals around the support hole 411. The second annular connecting portion 43 and the body 1 are against each other. The second annular connecting portion 43 has a plurality of second connecting holes (not shown in the figure). The plurality of second connecting holes are arranged at intervals around the support hole 411.

[0063] The motor 3 has a plurality of first threaded holes (not shown in the figure);

[0064] The body 1 has a plurality of second threaded holes (not shown in the figure);

[0065] The centrifugal fan also includes:

[0066] A plurality of first fastening screws (not shown in the figure), wherein the rods of the first fastening screws are sequentially penetrated by corresponding first connecting holes and first threaded holes and are threadedly connected to the first threaded holes, and the heads of the first fastening screws abut against one end of the first annular connecting portion 42 away from the motor 3;

[0067] A plurality of second fastening screws (not shown in the figure), the rods of the second fastening screws are sequentially penetrated with the corresponding second connection holes and second threaded holes and are screwed with the second threaded holes, and the heads of the second fastening screws are butted against one end of the second annular connection part 43 away from the body 1. By making the first annular connection part 42 butt against the motor 3 and connecting the first annular connection part 42 and the motor 3 together with a plurality of first fastening screws, the support base 4 and the motor 3 can be reliably connected together. Similarly, by making the second annular connection part 43 butt against the body 1 and connecting the second annular connection part 43 and the body 1 with a plurality of second fastening screws, the support base 4 and the body 1 can be reliably connected together. The combination of the two can greatly improve the structural stability of the centrifugal fan.

[0068] See also Figure 1 In one embodiment, the support seat 4 is further provided with a plurality of support plates 44, which are arranged on the outer peripheral wall of the support cylinder 41, and the support plates 44 connect the first annular connection portion 42 and the second annular connection portion 43, and the plurality of support plates 44 are arranged at intervals around the axial center line of the support cylinder 41. The arrangement of the support plates 44 realizes the connection of the support cylinder 41, the first annular connection portion 42, and the second annular connection portion 43 together, which can enhance the structural strength of the support seat 4, make the support seat 4 not easily deformed, and further enable the first annular connection portion 42 to be in close contact with the motor 3, and enable the second annular connection portion 43 to be in close contact with the body 1, which can further enhance the structural reliability of the centrifugal fan.

[0069] See also Figure 2-Figure 4 In one embodiment, the support hole 411 includes a first hole segment and a second hole segment, which are sequentially arranged along the axial direction of the support hole 411. The aperture of the first hole segment is smaller than the aperture of the second hole segment to form a limiting step end face 412 therebetween, and the limiting step end face 412 abuts against the outer end of the outer ring of the first bearing 6. The outer ring of the first bearing 6 and the outer ring of the second bearing 7 are both clearance-matched with the second hole segment to facilitate the first bearing 6 and the second bearing 7 to be installed into the support hole 411;

[0070] The centrifugal fan also includes:

[0071] A fastening nut 8, which is sleeved on the transmission shaft 5 and threadedly connected to the transmission shaft 5, and the fastening nut 8 abuts against the outer end of the inner ring of the first bearing 6;

[0072] The limiting sleeve 9 is sleeved on the transmission shaft 5. The limiting sleeve 9 is located between the first bearing 6 and the second bearing 7. One end of the limiting sleeve 9 abuts against the inner end of the inner ring of the first bearing 6, and the other end of the limiting sleeve 9 abuts against the inner end of the inner ring of the second bearing 7.

[0073] An annular limiting portion 51, the annular limiting portion 51 is provided on the transmission shaft 5, and the annular limiting portion 51 abuts against the outer end of the inner ring of the second bearing 7;

[0074] The limit cover 10 is arranged on the end of the support seat 4. The limit cover 10 and the outer end of the outer ring of the second bearing 7 are abutted against each other. The limit cover 10 has an avoidance hole, and the avoidance hole is provided for the second end of the transmission shaft 5 to pass through and is in clearance with the transmission shaft 5. In this way, during installation, the second bearing 7, the limit sleeve 9, the first bearing 6 and the fastening nut 8 can be sequentially installed on the transmission shaft 5 from the first end of the transmission shaft 5 to form an assembly, and then the assembly is installed into the support hole 411 from the end of the support hole 411 close to the impeller 2, and then the limit cover 10 is installed on the support seat 4, and then the first end of the transmission shaft 5 is connected to the drive shaft 31, and the second end of the transmission shaft 5 is connected to the impeller 2, and finally the first annular connecting part 42 is connected to the motor 3, and the second annular connecting part 43 is connected to the body 1, so that the assembly of the motor 3, the transmission shaft 5 and the impeller 2 can be completed, and the assembly operation is simple and the assembly is more convenient; wherein, the limit can be used The step end face 412 is used to axially limit the first bearing 6 to prevent the first bearing 6 from disengaging from the support hole 411, and the inner ring of the first bearing 6 is clamped together by the fastening nut 8 and the limiting sleeve 9 to position the first bearing 6, ensuring that the inner ring of the first bearing 6 can rotate with the transmission shaft 5, and the structural reliability is high; similarly, the limiting cover 10 can be used to axially limit the second bearing 7 to prevent the outer ring of the second bearing 7 from disengaging from the support hole 411, and the inner ring of the second bearing 7 is clamped together by the limiting sleeve 9 and the annular limiting portion 51 to position the second bearing 7, ensuring that the inner ring of the second bearing 7 can rotate with the transmission shaft 5, and the structural reliability is high.

[0075] In one embodiment, the annular limit portion 51 and the transmission shaft 5 are integrally arranged together, that is, the annular limit portion 51 and the transmission shaft 5 are integrally formed, which can avoid the need to fix the annular limit portion 51 and the transmission shaft 5, thereby simplifying the structure and improving assembly efficiency.

[0076] In one embodiment, the transmission shaft 5 has a third connecting hole (not shown in the figure) and a first keyway (not shown in the figure), the third connecting hole is located on the first end of the transmission shaft 5, and the first keyway is located on the hole wall of the third connecting hole;

[0077] The drive shaft 31 is inserted into the third connecting hole, and the drive shaft 31 has a second keyway;

[0078] The centrifugal fan also includes a first transmission key (not shown in the figure), which is arranged between the first keyway and the second keyway to connect the drive shaft 31 and the transmission shaft 5 together to prevent the transmission shaft 5 from rotating circumferentially relative to the drive shaft 31, so that the torque of the drive shaft 31 can be effectively transmitted to the transmission shaft 5.

[0079] In one embodiment, the impeller 2 has a fourth connecting hole (not shown in the figure) and a third keyway (not shown in the figure), and the third keyway is located on the hole wall of the fourth connecting hole;

[0080] The transmission shaft 5 has a fourth keyway (not shown in the figure);

[0081] The centrifugal fan also includes a second transmission key (not shown in the figure), which is arranged between the third keyway and the fourth keyway to connect the transmission shaft 5 and the impeller 2 together to prevent the impeller 2 from rotating circumferentially relative to the transmission shaft 5, so that the transmission shaft 5 can effectively transmit the torque output by the drive shaft 31 to the impeller 2, thereby improving the transmission efficiency.

[0082] See also Figure 1 In one embodiment, the body 1 comprises:

[0083] A volute 11, wherein the volute 11 accommodates the impeller 2;

[0084] The first mounting shell 12 is connected to the volute 11, and the first mounting shell 12 and the volute 11 are arranged in sequence along the width direction of the body 1. The first mounting shell 12 has a first mounting cavity 121, and the opening of the first mounting cavity 121 is located on the side away from the volute 11, and the first mounting cavity 121 accommodates the motor 3 and the support seat 4. By arranging the first mounting shell 12 and the volute 11 in sequence along the width direction of the body 1, the space utilization rate in the width direction of the body 1 can be effectively improved, making the overall structure of the centrifugal fan more compact. At the same time, by installing the motor 3 and the support seat 4 in the first mounting cavity 121, the internal space utilization rate of the first mounting shell 12 can be improved, avoiding occupying the external space of the first mounting shell 12, and enabling the motor 3, the support seat 4, and the first mounting shell 12 to form a modular structure, so that the assembly structure formed by the motor 3, the support seat 4, and the first mounting shell 12 can be conveniently installed on the volute 11, making the installation more convenient. In addition, since the opening of the first mounting cavity 121 is located on the side away from the volute 11, it is possible to avoid blocking the opening of the first mounting cavity 121, thereby facilitating the maintenance of the motor 3, the support seat 4 and other structures.

[0085] See also Figure 1 In one embodiment, the centrifugal fan further comprises:

[0086] The radiator 20 is connected to the first mounting shell 12 and is arranged below the first mounting shell 12, and the radiator 20 and the volute 11 are offset from each other, so that the radiator 20 can be used to dissipate heat for the impeller 2 and the motor 3 at the same time, ensuring that the impeller 2 and the motor 3 can both operate efficiently. At the same time, it can also improve the space utilization rate in the width direction of the body 1, avoid occupying other space of the body 1, and make the structure of the centrifugal fan more compact.

[0087] See also Figure 1 In one embodiment, the centrifugal fan further comprises:

[0088] The support frame 30 is arranged on the bottom wall of the first installation cavity 121 close to the radiator 20. The support frame 30 supports the motor 3. The support frame 30 is a structure made of a heat-conducting material. In this way, the support frame 30 can be used to support the motor 3, so as to raise the motor 3 and ensure that the driving shaft 31, the transmission shaft 5, and the connecting shaft of the impeller 2 are concentric, thereby helping to improve the transmission efficiency. At the same time, the support frame 30 made of a heat-conducting material can realize the efficient transfer of the heat generated by the motor 3 when it is working to the radiator 20, so as to improve the heat dissipation efficiency of the motor 3.

[0089] See also Figure 1 In one embodiment, the body 1 further comprises:

[0090] The second mounting shell 13 is connected to the first mounting shell 12 and is disposed below the first mounting shell 12. The second mounting shell 13 has a second accommodating cavity, and the second accommodating cavity accommodates the radiator 20. In this way, during assembly, the radiator 20 can be installed in the second mounting shell 13 to form a modular structure, and then the modular structure is connected to the volute 11 and the first mounting shell 12, which is more convenient for assembly.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0092] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0093] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A centrifugal fan, characterized in that: include: Body; An impeller, the impeller being rotatably disposed on the machine body; A motor, wherein the motor is arranged on the machine body and a driving shaft is arranged on the motor; A support base, the support base is located between the machine body and the motor and connects the machine body and the motor, the support base has a support hole, and the support hole passes through the support base both front and back; A transmission shaft, the transmission shaft is rotatably disposed in the support hole, a first end of the transmission shaft is connected to the drive shaft, and a second end of the transmission shaft is connected to the impeller; a first bearing, the first bearing being disposed in the support hole and located on a side close to the first end of the transmission shaft, the inner hole of the first bearing being matched with the transmission shaft so that the inner ring of the first bearing rotates with the transmission shaft; The second bearing is arranged in the support hole and is located on a side close to the second end of the transmission shaft. The inner hole of the second bearing cooperates with the transmission shaft so that the inner ring of the second bearing rotates with the transmission shaft.

2. A centrifugal fan according to claim 1, characterized in that: The support seat is provided with a support tube, a first annular connection part and a second annular connection part, the support tube has the support hole, the first annular connection part and the second annular connection part are placed at both ends of the support tube, the first annular connection part and the motor are against each other, the first annular connection part has a plurality of first connection holes, and the plurality of first connection holes are arranged at intervals around the support hole, the second annular connection part and the body are against each other, the second annular connection part has a plurality of second connection holes, and the plurality of second connection holes are arranged at intervals around the support hole; The motor has a plurality of first threaded holes; The body has a plurality of second threaded holes; The centrifugal fan also includes: A plurality of first fastening screws, wherein the rods of the first fastening screws are sequentially provided with the corresponding first connecting holes and the first threaded holes and are threadedly connected with the first threaded holes, and the heads of the first fastening screws abut against one end of the first annular connecting portion away from the motor; A plurality of second fastening screws, wherein the rods of the second fastening screws are sequentially penetrated through the corresponding second connecting holes and the second threaded holes and are threadedly connected with the second threaded holes, and the heads of the second fastening screws and one end of the second annular connecting portion facing away from the machine body are abutted against each other.

3. A centrifugal fan according to claim 2, characterized in that: The support seat is also provided with a plurality of support plates, which are arranged on the outer peripheral wall of the support tube, and the support plates connect the first annular connecting part and the second annular connecting part. The plurality of support plates are arranged at intervals around the axial center line of the support tube.

4. A centrifugal fan according to claim 1, characterized in that: The support hole comprises a first hole segment and a second hole segment, the first hole segment and the second hole segment are sequentially arranged along the axial direction of the support hole, the aperture of the first hole segment is smaller than the aperture of the second hole segment to form a limiting step end face therebetween, the limiting step end face abuts against the outer end of the outer ring of the first bearing, and the outer ring of the first bearing and the outer ring of the second bearing are both clearance-matched with the second hole segment; The centrifugal fan also includes: A fastening nut, wherein the fastening nut is sleeved on the transmission shaft and threadedly connected to the transmission shaft, and the fastening nut abuts against an outer end of an inner ring of the first bearing; A limiting sleeve, the limiting sleeve is arranged on the transmission shaft, the limiting sleeve is located between the first bearing and the second bearing, one end of the limiting sleeve abuts against the inner end of the inner ring of the first bearing, and the other end of the limiting sleeve abuts against the inner end of the inner ring of the second bearing; An annular limiting portion, the annular limiting portion is arranged on the transmission shaft, and the annular limiting portion and the outer end of the inner ring of the second bearing abut against each other; A limit cover is arranged on the end of the support seat, the limit cover and the outer end of the outer ring of the second bearing are abutted against each other, and the limit cover has an avoidance hole, the avoidance hole is for the second end of the transmission shaft to pass through and is clearance-matched with the transmission shaft.

5. A centrifugal fan according to claim 4, characterized in that: The annular limiting portion and the transmission shaft are integrally arranged together.

6. A centrifugal fan according to claim 1, characterized in that: The transmission shaft has a third connecting hole and a first keyway, the third connecting hole is located on the first end of the transmission shaft, and the first keyway is located on the hole wall of the third connecting hole; The driving shaft is inserted into the third connecting hole, and the driving shaft has a second keyway; The centrifugal fan further includes a first transmission key, which is disposed between the first keyway and the second keyway to connect the drive shaft and the transmission shaft together.

7. The centrifugal fan according to claim 1, characterized in that: The impeller has a fourth connecting hole and a third keyway, and the third keyway is located on the hole wall of the fourth connecting hole; The transmission shaft has a fourth keyway; The centrifugal fan further includes a second transmission key, which is disposed between the third keyway and the fourth keyway to connect the transmission shaft and the impeller together.

8. The centrifugal fan according to claim 1, characterized in that: The body comprises: a volute housing the impeller; A first mounting shell, wherein the first mounting shell is connected to the volute, the first mounting shell and the volute are arranged in sequence along the width direction of the machine body, the first mounting shell has a first mounting cavity, the opening of the first mounting cavity is located on the side away from the volute, and the first mounting cavity accommodates the motor and the support seat.

9. A centrifugal fan according to claim 8, characterized in that: The centrifugal fan also includes: A radiator is connected to the first mounting shell and is disposed below the first mounting shell, and the radiator and the volute are against each other.

10. A centrifugal fan according to claim 9, characterized in that: The centrifugal fan also includes: A support frame, the support frame is arranged on the bottom wall of the first installation cavity close to the radiator, the support frame supports the motor, and the support frame is a structure made of a heat-conducting material; And / or, the body further comprises: The second mounting shell is connected to the first mounting shell and is arranged below the first mounting shell. The second mounting shell has a second accommodating cavity, and the second accommodating cavity accommodates the radiator.

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