A double-inlet centrifugal fan

Abstract

The present invention discloses a double-inlet centrifugal fan, aiming to solve the problems in the prior art that the structure is complex during installation, which affects the production efficiency, and the volume of the motor itself affects the air intake efficiency; there is a lack of shock-absorbing structure design, and when the fan power is higher than 1000W, the vibration noise of the fan increases significantly. The present invention solves the above technical problems through the following technical solutions: a volute, a centrifugal wind wheel is arranged in the volute, and the first air inlet channel and the second air inlet channel are arranged on both sides of the volute corresponding to the centrifugal wind wheel; a motor, and the centrifugal wind wheel is fixedly arranged on the outer ring of the motor; a central axis is arranged in the center of the motor, and both ends of the central axis are fixedly arranged inside the volute through a bracket assembly; the bracket assembly includes a mounting plate and a plurality of mounting brackets, and the plurality of mounting brackets are arranged along the circumferential direction of the mounting plate; the central axis is passed through the mounting plate, and the end of the mounting bracket away from the mounting plate is fixedly connected to the volute.

Description

Technical Field

[0001] The invention relates to the technical field of double-inlet centrifugal fans, and more specifically, to a double-inlet centrifugal fan. Background Art

[0002] EC outer rotor motor technology: EC outer rotor motor uses permanent magnets as magnetic field source, which is a technology that uses digital brushless DC outer rotor motor. This motor is essentially a three-phase AC permanent magnet synchronous motor, which has the characteristics of high intelligence, high energy saving, high efficiency, long life, low vibration, low noise and continuous uninterrupted operation.

[0003] EC external rotor motors are widely used in modern fans. Since EC fans use highly efficient and energy-saving external rotor motor technology, their energy consumption can be reduced by more than 50%. In addition, the speed and power of the motor can be precisely controlled under different loads, making the EC fan more energy efficient. At the same time, it also has the advantages of low noise, high reliability, long service life, and supports remote monitoring and automatic control, which is convenient and easy to use.

[0004] The double air inlet design is one of the core features of the double air inlet fan. The design of two air inlets can greatly increase the air flow and wind force, thereby enhancing the aerodynamic efficiency of the fan system.

[0005] Integrated design of motor and fan: By closely integrating the motor and fan, the loss in the energy transfer process can be reduced and the overall efficiency of the system can be improved. At the same time, the integrated design can also simplify the installation and maintenance process of the system and reduce the cost of use.

[0006] The double-inlet centrifugal fan in the prior art has the following technical problems during use: (1) There is a lack of shock-absorbing structure design, and when the fan power is higher than 1000W, the vibration noise of the fan increases significantly; (2) Lack of heat dissipation structure design, the maximum power of the fan is limited by the heat dissipation of the motor; (3) During installation, radial tightening screws are required, which requires operation inside the fan. This is very inconvenient and affects production efficiency. At the same time, the size of the motor itself affects the air intake efficiency. Summary of the invention

[0007] The present invention overcomes the following deficiencies in the prior art: (1) During installation, radial tightening screws are required, which requires operation inside the fan, which is very inconvenient and affects production efficiency. At the same time, the size of the motor itself affects the air intake efficiency; (2) There is a lack of shock-absorbing structure design, and the higher the fan power, the more difficult it is to correct the dynamic balance of the fan, and the vibration noise increases significantly; (3) There is a lack of heat dissipation structure design, and the maximum power of the fan is limited by the heat dissipation of the motor; Provided is a double-inlet centrifugal fan, which has a simple structure, a large air intake area at both ends of the fan, and the motor does not block the wind, thereby improving the air intake efficiency; A shock-absorbing structure is provided, which can greatly reduce the vibration generated when the fan is running; The motor is provided with a heat dissipation structure, which can significantly increase the power of the motor and is suitable for using the fan in high-power places.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solution: a double-inlet centrifugal fan, characterized in that it includes: A volute, wherein a centrifugal wind wheel is arranged in the volute, and a first air inlet channel and a second air inlet channel are respectively arranged on both sides of the volute corresponding to the centrifugal wind wheel; The motor, the centrifugal wind wheel is fixedly arranged on the outer ring of the motor; the center of the motor is provided with a central shaft, and both ends of the central shaft are fixedly arranged inside the volute through a bracket assembly; The bracket assembly includes a mounting plate and a plurality of mounting brackets, which are arranged along the circumferential direction of the mounting plate; both ends of the central axis are passed through the mounting plate for axial fixation, and one end of the mounting bracket away from the mounting plate is fixedly connected to the volute.

[0009] In the present invention, the two ends of the central axis are axially fixed by means of mounting plates. During installation, it is only necessary to tighten the screws at the two ends of the central axis, which is very convenient to install and effectively improves production efficiency. The motor is fixedly mounted inside the volute through a bracket assembly, which enables the motor to be located in the middle position of the volute, that is, the motor is fixedly mounted in the middle position of the axis of the centrifugal wind wheel, so that the motor will not affect the air intake at both ends of the first air inlet channel and the second air inlet channel. The centrifugal wind wheel is fixedly mounted on the outer casing of the motor. When the motor rotates, the motor drives the centrifugal wind wheel to rotate, ensuring the air intake efficiency of the centrifugal wind wheel. In addition, the motor is installed in the center position of the volute through the bracket assembly. Due to the simple structure of the bracket assembly, the installation efficiency of the double-inlet centrifugal fan of the present application can also be improved.

[0010] Preferably, a shock absorbing assembly is provided on the side of the mounting plate facing the motor; the shock absorbing assembly comprises: A fixed disk, wherein a non-circular hole matching the central axis is arranged at the center of the fixed disk; at least four circumferential holes are distributed in the circumferential direction of the non-circular hole; Two shock-absorbing ring discs, both of which are provided with ring disc holes corresponding to the circumferential holes in the circumferential direction, and shock-absorbing sleeves are arranged at intervals along the ring disc holes on one end surface of the shock-absorbing ring disc, and the shock-absorbing sleeves are made of a material with a buffering effect; the two shock-absorbing ring discs are symmetrically arranged on both sides of the fixed disc, and the shock-absorbing sleeves on the two shock-absorbing ring discs are staggered and penetrated in the circumferential holes; A limit plate is arranged on a side of the two shock-absorbing ring plates away from the mounting plate; The shock-absorbing bolt passes through the mounting plate, the shock-absorbing ring plate and the fixing plate in sequence and is fixedly connected with the limiting plate.

[0011] Preferably, the motor comprises a first motor shell and a second motor shell, a plurality of heat dissipation holes are provided through the first motor shell and the second motor shell, and heat dissipation blades are provided in the second motor shell along a circumferential direction.

[0012] When the central shaft is vibrated by torque, the torque of the central shaft will be transmitted to the fixed plate. After the fixed plate is subjected to the torque, the torque will be transmitted to the shock-absorbing sleeve. The shock-absorbing sleeve is made of rubber material and has the function of buffering and shock-absorbing. The shock-absorbing sleeve absorbs the torque, thereby playing the role of buffering and shock-absorbing, thereby absorbing the torque in the circumferential direction of the central shaft, thereby reducing the vibration of the double-inlet centrifugal fan.

[0013] Preferably, the mounting bracket comprises a first mounting frame and a second mounting frame fixedly connected to the mounting plate, and a mounting plate is provided at one end of the first mounting frame and the second mounting frame away from the mounting plate, and the mounting plate is fixedly connected to the volute.

[0014] The first mounting frame and the second mounting frame are in a "Z" shape, so that one end of the first mounting frame and the second mounting frame can be fixedly connected to the volute, and the other end can extend into the interior of the volute and be fixedly connected to the mounting plate.

[0015] Preferably, the number of the shock absorbing bolts is the same as the number of the circumferential holes.

[0016] A shock-absorbing bolt is installed in each circumferential hole to make the overall structure more stable.

[0017] Preferably, a rigid sleeve is arranged inside the shock absorbing sleeve.

[0018] The rigid sleeve plays two roles in the shock-absorbing sleeve. The first role is to support the shock-absorbing sleeve, thereby preventing the shock-absorbing sleeve from being deformed after being subjected to torque; the second role is to isolate the shock-absorbing bolt, so that the shock-absorbing bolt will not contact the shock-absorbing sleeve, so that the bolt can smoothly pass through the rigid sleeve and be threadedly connected with the fixed threaded hole.

[0019] Preferably, a flange ring is fixedly provided on the outer circumference of the first motor housing, a plurality of first mounting holes are provided on the flange ring, a wind wheel mounting ring is centrally installed on the centrifugal wind wheel, a wind wheel mounting ring is provided with wind wheel mounting holes corresponding to the first mounting holes, and the first mounting holes and the wind wheel mounting holes are fixedly connected by a connecting piece.

[0020] It is convenient to assemble the motor and the centrifugal impeller, and improves the assembly efficiency.

[0021] Preferably, a plurality of second mounting holes are provided on the flange ring, a housing mounting hole is provided at the opening of the second motor housing, and the housing mounting hole is fixedly connected to the second mounting hole via a connecting piece.

[0022] A flange ring can be provided to mount both the second motor housing and the centrifugal wind wheel, thereby making the overall structure simpler, making assembly more convenient, and improving production efficiency.

[0023] Preferably, axial buffer assemblies are provided at both ends of the central shaft, and the axial buffer assemblies include a buffer gasket, a limit gasket and a limit piece arranged on the side of the mounting plate away from the motor. The limit piece passes through the limit gasket and the buffer gasket and is threadedly connected to the axial hole of the central shaft.

[0024] When the center shaft moves axially, the buffer gasket can play a good buffering and shock-absorbing role on the axial transmission of the center shaft.

[0025] Preferably, the fixing plate comprises a plurality of overlapping fixing plates, a plurality of fixing grooves are arranged in the circumferential direction of the fixing plates, and a fixing ridge corresponding to the fixing groove is arranged on the other end surface of the fixing plates; when adjacent fixing plates are overlapped, the fixing ridges on the adjacent fixing plates cooperate with the fixing grooves When the central shaft is subjected to axial transmission, the fixed plates in the fixed plate squeeze each other to buffer the axial movement of the central shaft. In other words, the fixed plate cooperates with the shock absorbing ring plate and the limit plate to not only play the role of axial shock absorption, but also the role of circumferential shock absorption, and has a good shock absorption effect.

[0026] Compared with the prior art, the present invention has the following beneficial effects: (1) The two ends of the central axis are axially fixed by means of mounting plates. During installation, it is only necessary to tighten the screws at both ends of the central axis. The installation is very convenient and effectively improves production efficiency. The motor is fixedly mounted inside the volute through a bracket assembly, which enables the motor to be located in the middle of the volute, that is, the motor is fixedly mounted in the middle of the axis of the centrifugal wind wheel, so that the motor will not affect the air intake at both ends of the first air inlet channel and the second air inlet channel. The centrifugal wind wheel is fixedly mounted on the outer casing of the motor. When the motor rotates, the motor drives the centrifugal wind wheel to rotate, ensuring the air intake efficiency of the centrifugal wind wheel. In addition, the motor is installed in the center of the volute through a bracket assembly. The bracket assembly has a simple structure and can improve the installation efficiency of the double-inlet centrifugal fan of this application.

[0027] (2) When the central shaft is subjected to torque and vibrates, the torque of the central shaft will be transmitted to the fixed plate. After the fixed plate is subjected to the torque, the torque will be transmitted to the shock-absorbing sleeve. The shock-absorbing sleeve is made of rubber material and has the function of buffering and shock-absorbing. The shock-absorbing sleeve absorbs the torque, thereby playing a role of buffering and shock-absorbing, thereby absorbing the torque in the circumferential direction of the central shaft, thereby reducing the vibration of the double-inlet centrifugal fan.

[0028] (3) When the first motor housing and the second motor housing rotate, the heat dissipation blades inside the first motor housing and the second motor housing will also rotate. The heat dissipation blades generate wind force during the rotation process, thereby blowing the heat inside the motor out of the heat dissipation holes, thereby effectively reducing the heat inside the motor and allowing the motor to be used at a higher power. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the front view of the present invention.

[0030] Figure 2 It is the centrifugal wind wheel of the present invention;.

[0031] Figure 3 It is a structural diagram of the bracket assembly of the present invention.

[0032] Figure 4 It is a three-dimensional structural diagram of the motor of the present invention.

[0033] Figure 5 is a cross-sectional view of the motor of the present invention.

[0034] Figure 6 yes Figure 5 A partial enlarged view of the .

[0035] Figure 7 It is an exploded structural diagram of the shock absorbing assembly and the axial buffer assembly of the present invention.

[0036] Figure 8 It is an exploded structural diagram from another angle of the present invention.

[0037] Fig. 9 It is an exploded structural diagram of the motor of the present invention.

[0038] Fig.10 It is a three-dimensional structural diagram of the second motor housing of the present invention.

[0039] Fig.11 It is a three-dimensional structural diagram of the fixing plate of the present invention.

[0040] Fig.12 It is a three-dimensional structural diagram of the fixing plate of the present invention from another angle.

[0041] In the figure: 1, volute, 11, first air inlet channel, 12, second air inlet channel, 13, air outlet channel, 2. Motor, 21. Central axis, 22. First motor housing, 221. Heat dissipation hole, 23. Second motor housing, 231. Heat dissipation fan blade, 232. Housing mounting hole, 24. Flange ring, 241. First mounting hole, 242. Second mounting hole; 3. centrifugal wind wheel, 31. wind wheel mounting ring, 32. wind wheel mounting hole; 4. Bracket assembly, 41. Mounting plate, 411. First mounting hole, 412. Second mounting hole, 42. Mounting bracket, 421. First mounting bracket, 422. Second mounting bracket, 423. Mounting sheet, 424. Mounting hole; 5. shock absorbing assembly, 51. fixing plate, 511. non-circular hole, 512. circumferential hole, 513. fixing plate, 514. fixing groove, 515. fixing ridge, 52. shock absorbing ring plate; 521. ring plate hole, 522. shock absorbing sleeve, 53. limiting plate, 531. fixing threaded hole, 54. shock absorbing bolt, 55. rigid sleeve; 6. Axial buffer assembly, 61. Buffer gasket, 62. Limiting gasket, 63. Limiting piece. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Reference Figures 1 to 3 As shown, a double-inlet centrifugal fan includes: a volute 1 and a motor 22 arranged in the volute 1.

[0043] A centrifugal wind wheel 3 is arranged in the volute 1, and a first air inlet channel 11 and a second air inlet channel 12 are respectively arranged on both sides of the volute 1 corresponding to the centrifugal wind wheel 3; an air outlet channel 13 is arranged in the volute 1 perpendicular to the first air inlet channel 11 and the second air inlet channel 12.

[0044] The centrifugal wind wheel 3 is fixedly arranged on the outer ring of the motor 2 ; a central shaft 21 is arranged at the center of the motor 2 , and both ends of the central shaft 21 are fixedly arranged inside the volute 1 through a bracket assembly 4 .

[0045] The bracket assembly 4 includes a mounting plate 41 and a plurality of mounting brackets 42, and the plurality of mounting brackets 42 are arranged along the circumferential direction of the mounting plate 41; both ends of the central shaft 21 are inserted into the mounting plate 41 to axially fix the central shaft 21, and one end of the mounting bracket 42 away from the mounting plate 41 is fixedly connected to the volute 1. A first mounting through hole 411 is arranged at the center of the mounting plate 41 in this embodiment, and the central shaft 21 is inserted into the first mounting through hole 411.

[0046] The two ends of the central axis 21 are axially fixed by the mounting plate 41. When installing, it is only necessary to tighten the screws at the two ends of the central axis 21. The installation is very convenient and effectively improves the production efficiency. The motor 2 is fixedly mounted inside the volute 1 through the bracket assembly 4, which enables the motor 2 to be located in the middle position of the volute 1, that is, the motor 2 is fixedly mounted in the middle position of the axis of the centrifugal wind wheel 3, so that the motor 2 will not affect the air intake at both ends of the first air inlet channel 11 and the second air inlet channel 12. The centrifugal wind wheel 3 is fixedly mounted on the outer casing of the motor 2. When the motor 2 rotates, the motor 2 drives the centrifugal wind wheel 3 to rotate, ensuring the air intake efficiency of the centrifugal wind wheel 3. In addition, the motor 2 is installed in the center position of the volute 1 through the bracket assembly 4. The bracket assembly 4 has a simple structure and can improve the installation efficiency of the double-inlet centrifugal fan of the present application.

[0047] The mounting bracket 42 includes a first mounting frame 421 and a second mounting frame 422 fixedly connected to the mounting plate, and one end of the first mounting frame 421 and the second mounting frame 422 is fixedly connected to the mounting plate 41 by welding. A mounting piece 423 is provided at one end of the first mounting frame 421 and the second mounting frame 422 away from the mounting plate 41, and the mounting piece 423 is fixedly connected to the first mounting frame 421 and the second mounting frame 422 by welding. The structure of the first mounting frame 421 and the second mounting frame 422 is a "Z" shape, which enables one end of the first mounting frame 421 and the second mounting frame 422 to be fixedly connected to the volute 1, and the other end can extend into the interior of the volute 1 and be fixedly connected to the mounting plate 41. The mounting piece 423 is fixedly connected to the volute 1. In this embodiment, a mounting through hole 424 is provided on the mounting piece 423, and the bolt passes through the mounting through hole 424 and is fixedly connected to the volute 1.

[0048] In the present invention, the motor 2 is fixedly mounted inside the volute 1 through the bracket assembly 4, which enables the motor 2 to be located in the middle position of the volute 1, that is, the motor 2 is fixedly mounted in the middle position of the axis of the centrifugal wind wheel 3, so that the motor 2 will not affect the air intake at both ends of the first air inlet channel 11 and the second air inlet channel 12. The centrifugal wind wheel 3 is fixedly mounted on the outer shell of the motor 2. When the motor 2 rotates, the motor 2 drives the centrifugal wind wheel 3 to rotate, ensuring the air intake efficiency of the centrifugal wind wheel 3. In addition, the motor 2 is installed in the center position of the volute 1 through the bracket assembly 4, and the bracket assembly 4 has a simple structure, which can improve the installation efficiency of the double-inlet centrifugal fan of the present application.

[0049] Example 2: Reference Figures 1 to 10 As shown, a double-inlet centrifugal fan includes: a volute 1 and a motor 22 arranged in the volute 1.

[0050] A centrifugal wind wheel 3 is arranged in the volute 1, and a first air inlet channel 11 and a second air inlet channel 12 are respectively arranged on both sides of the volute 1 corresponding to the centrifugal wind wheel 3; an air outlet channel 13 is arranged in the volute 1 perpendicular to the first air inlet channel 11 and the second air inlet channel 12.

[0051] The centrifugal wind wheel 3 is fixedly arranged on the outer ring of the motor 2 ; a central shaft 2121 is arranged at the center of the motor 2 , and both ends of the central shaft 21 are fixedly arranged inside the volute 1 through a bracket assembly 4 .

[0052] The bracket assembly 4 includes a mounting plate 41 and a plurality of mounting brackets 42, wherein the plurality of mounting brackets 42 are arranged along the circumferential direction of the mounting plate 41; the central shaft 21 is passed through the mounting plate 41, and both ends of the central shaft 21 are axially fixed, and one end of the mounting bracket 42 away from the mounting plate 41 is fixedly connected to the volute 1. A first mounting through hole 411 is arranged at the center of the mounting plate 41 in this embodiment, and the central shaft 21 is passed through the first mounting through hole 411.

[0053] The motor 2 is fixedly mounted inside the volute 1 through the bracket assembly 4, which enables the motor 2 to be located in the middle position of the volute 1, that is, the motor 2 is fixedly mounted in the middle position of the axis of the centrifugal wind wheel 3, so that the motor 2 will not affect the air intake at both ends of the first air inlet channel 11 and the second air inlet channel 12. The centrifugal wind wheel 3 is fixedly mounted on the outer shell of the motor 2. When the motor 2 rotates, the motor 2 drives the centrifugal wind wheel 3 to rotate, ensuring the air intake efficiency of the centrifugal wind wheel 3. In addition, the motor 2 is installed in the center position of the volute 1 through the bracket assembly 4, and the bracket assembly 4 has a simple structure, which can improve the installation efficiency of the double-inlet centrifugal fan of the present application.

[0054] The mounting bracket 42 includes a first mounting frame 421 and a second mounting frame 422 fixedly connected to the mounting plate, and one end of the first mounting frame 421 and the second mounting frame 422 is fixedly connected to the mounting plate 41 by welding. A mounting piece 423 is provided at one end of the first mounting frame 421 and the second mounting frame 422 away from the mounting plate 41, and the mounting piece 423 is fixedly connected to the first mounting frame 421 and the second mounting frame 422 by welding. The structure of the first mounting frame 421 and the second mounting frame 422 is a "Z" shape, which enables one end of the first mounting frame 421 and the second mounting frame 422 to be fixedly connected to the volute 1, and the other end can extend into the interior of the volute 1 and be fixedly connected to the mounting plate 41. The mounting piece 423 is fixedly connected to the volute 1. In this embodiment, a mounting through hole 424 is provided on the mounting piece 423, and the bolt passes through the mounting through hole 424 and is fixedly connected to the volute 1.

[0055] The structure of this embodiment is similar to that of Embodiment 1, except that a shock absorbing assembly 5 is provided on the side of the mounting plate 41 facing the motor 2 ; the shock absorbing assembly 5 includes: a fixing plate 51 , two shock absorbing ring plates 52 , a limiting plate 53 and shock absorbing bolts 54 .

[0056] A non-circular hole 511 matching the central axis 21 is provided at the center of the fixed disk 51, and the cross-section at the end of the central axis 21 has the same shape structure as the non-circular hole 511, so that the torque of the central disk can be transmitted to the fixed disk 51; at least four circumferential holes 512 are distributed in the circumferential direction of the non-circular hole 511, and four circumferential holes 512 are provided in this embodiment.

[0057] The two shock-absorbing ring disks 52 are provided with ring disk holes 521 corresponding to the circumferential holes 512 in the circumferential direction, that is, each shock-absorbing ring disk 52 in this embodiment is provided with four ring disk holes 521. Shock-absorbing sleeves 522 are arranged at intervals along the ring disk holes 521 on one end surface of the shock-absorbing ring disk 52. The shock-absorbing sleeves 522 are made of a material with a buffering effect. In this embodiment, the shock-absorbing sleeves 522 and the shock-absorbing ring disk 52 are integrally formed and are made of rubber material; the two shock-absorbing ring disks 52 are symmetrically arranged on both sides of the fixed disk 51, and the shock-absorbing sleeves on the two shock-absorbing ring disks 52 are staggeredly inserted into the circumferential holes 512, that is, the shock-absorbing sleeves 522 on the two shock-absorbing ring disks 52 are staggeredly arranged in the circumferential holes 512.

[0058] The limiting plate 53 is arranged on a side of the two damping ring plates 52 away from the fixed plate 51 ; a plurality of fixing threaded holes 531 are arranged in the circumferential direction of the limiting plate 53 , and the number of the fixing threaded holes 531 in this embodiment is also four.

[0059] A second installation through hole 412 is provided on the installation plate 41, and the second installation through hole 412 is arranged in the circumferential direction of the first installation through hole 411; the shock-absorbing bolt passes through the second installation through hole 412, the shock-absorbing ring plate 52 and the fixed plate 51 in sequence and is threadedly connected with the fixed threaded hole 531; the fixed plate 51, the shock-absorbing ring plate 52 and the limit sleeve are fixedly connected into a whole.

[0060] The number of the shock absorbing bolts 54 is the same as the number of the circumferential holes 512. Therefore, four shock absorbing bolts 54 are also provided in this embodiment.

[0061] In one embodiment, a rigid sleeve 55 is provided in the shock absorbing sleeve 522. The shock absorbing bolt 54 passes through the rigid sleeve 55 and is threadedly connected to the fixed threaded hole 531. The rigid sleeve 55 plays two roles in the shock absorbing sleeve 522. The first role is to support the shock absorbing sleeve 522, thereby preventing the shock absorbing sleeve 522 from being deformed after the shock absorbing sleeve 522 is subjected to torque; the second role is to isolate the shock absorbing bolt 54, so that the shock absorbing bolt 54 will not contact the shock absorbing sleeve 522, so that the bolt can smoothly pass through the rigid sleeve 55 and be threadedly connected to the fixed threaded hole 531.

[0062] In the present invention, both ends of the central axis 21 are axially fixed by means of mounting plates 41. When installing, it is only necessary to tighten the screws at both ends of the central axis 21. The installation is very convenient and can effectively improve production efficiency. The motor 2 is fixedly mounted inside the volute 1 through the bracket assembly 4, which enables the motor 2 to be located in the middle position of the volute 1, that is, the motor 2 is fixedly mounted in the middle position of the axis of the centrifugal wind wheel 3, so that the motor 2 will not affect the air intake at both ends of the first air inlet channel 11 and the second air inlet channel 12. The centrifugal wind wheel 3 is fixedly mounted on the outer casing of the motor 2. When the motor 2 rotates, the motor 2 drives the centrifugal wind wheel 3 to rotate, ensuring the air intake efficiency of the centrifugal wind wheel 3. In addition, the motor 2 is installed in the center position of the volute 1 through the bracket assembly 4. The bracket assembly 4 has a simple structure and can improve the installation efficiency of the double-inlet centrifugal fan of the present application.

[0063] When the central shaft 21 is subjected to torque and vibrates, the torque of the central shaft 21 will be transmitted to the fixed plate 51. After the fixed plate 51 bears the torque, it will transmit the torque to the shock-absorbing sleeve 522. The shock-absorbing sleeve 522 is made of rubber material and has a buffering and shock-absorbing effect. The shock-absorbing sleeve 522 absorbs the torque, thereby playing a buffering and shock-absorbing role, thereby absorbing the torque in the circumferential direction of the central shaft 21, thereby reducing the vibration of the double-inlet centrifugal fan.

[0064] Example 3: Reference Figures 1 to 10 As shown, a double-inlet centrifugal fan includes: a volute 1 and a motor 22 arranged in the volute 1.

[0065] A centrifugal wind wheel 3 is arranged in the volute 1, and a first air inlet channel 11 and a second air inlet channel 12 are respectively arranged on both sides of the volute 1 corresponding to the centrifugal wind wheel 3; an air outlet channel 13 is arranged in the volute 1 perpendicular to the first air inlet channel 11 and the second air inlet channel 12.

[0066] The centrifugal wind wheel 3 is fixedly arranged on the outer ring of the motor 2 ; a central shaft 2121 is arranged at the center of the motor 2 , and both ends of the central shaft 21 are fixedly arranged inside the volute 1 through a bracket assembly 4 .

[0067] The bracket assembly 4 includes a mounting plate 41 and a plurality of mounting brackets 42, wherein the plurality of mounting brackets 42 are arranged along the circumferential direction of the mounting plate 41; the central shaft 21 is passed through the mounting plate 41, and one end of the mounting bracket 42 away from the mounting plate 41 is fixedly connected to the volute 1. In this embodiment, a first mounting through hole 411 is arranged at the center of the mounting plate 41, and the central shaft 21 is passed through the first mounting through hole 411.

[0068] The motor 2 is fixedly mounted inside the volute 1 through the bracket assembly 4, which enables the motor 2 to be located in the middle position of the volute 1, that is, the motor 2 is fixedly mounted in the middle position of the axis of the centrifugal wind wheel 3, so that the motor 2 will not affect the air intake at both ends of the first air inlet channel 11 and the second air inlet channel 12. The centrifugal wind wheel 3 is fixedly mounted on the outer shell of the motor 2. When the motor 2 rotates, the motor 2 drives the centrifugal wind wheel 3 to rotate, ensuring the air intake efficiency of the centrifugal wind wheel 3. In addition, the motor 2 is installed in the center position of the volute 1 through the bracket assembly 4, and the bracket assembly 4 has a simple structure, which can improve the installation efficiency of the double-inlet centrifugal fan of the present application.

[0069] The mounting bracket 42 includes a first mounting frame 421 and a second mounting frame 422 fixedly connected to the mounting plate, and one end of the first mounting frame 421 and the second mounting frame 422 is fixedly connected to the mounting plate 41 by welding. A mounting piece 423 is provided at one end of the first mounting frame 421 and the second mounting frame 422 away from the mounting plate 41, and the mounting piece 423 is fixedly connected to the first mounting frame 421 and the second mounting frame 422 by welding. The structure of the first mounting frame 421 and the second mounting frame 422 is a "Z" shape, which enables one end of the first mounting frame 421 and the second mounting frame 422 to be fixedly connected to the volute 1, and the other end can extend into the interior of the volute 1 and be fixedly connected to the mounting plate 41. The mounting piece 423 is fixedly connected to the volute 1. In this embodiment, a mounting through hole 424 is provided on the mounting piece 423, and the bolt passes through the mounting through hole 424 and is fixedly connected to the volute 1.

[0070] The structure of this embodiment is similar to that of Embodiment 1, except that a shock absorbing assembly 5 is provided on the side of the mounting plate 41 facing the motor 2 ; the shock absorbing assembly 5 includes: a fixing plate 51 , two shock absorbing ring plates 52 , a limiting plate 53 and shock absorbing bolts 54 .

[0071] A non-circular hole 511 matching the central axis 21 is provided at the center of the fixed disk 51, and the cross-section at the end of the central axis 21 has the same shape structure as the non-circular hole 511, so that the torque of the central disk can be transmitted to the fixed disk 51; at least four circumferential holes 512 are distributed in the circumferential direction of the non-circular hole 511, and four circumferential holes 512 are provided in this embodiment.

[0072] The two shock-absorbing ring disks 52 are provided with ring disk holes 521 corresponding to the circumferential holes 512 in the circumferential direction, that is, each shock-absorbing ring disk 52 in this embodiment is provided with four ring disk holes 521. Shock-absorbing sleeves 522 are arranged at intervals along the ring disk holes 521 on one end surface of the shock-absorbing ring disk 52. The shock-absorbing sleeves 522 are made of a material with a buffering effect. In this embodiment, the shock-absorbing sleeves 522 and the shock-absorbing ring disk 52 are integrally formed and are made of rubber material; the two shock-absorbing ring disks 52 are symmetrically arranged on both sides of the fixed disk 51, and the shock-absorbing sleeves on the two shock-absorbing ring disks 52 are staggeredly inserted into the circumferential holes 512, that is, the shock-absorbing sleeves 522 on the two shock-absorbing ring disks 52 are staggeredly arranged in the circumferential holes 512.

[0073] The limiting plate 53 is arranged on a side of the two damping ring plates 52 away from the fixed plate 51 ; a plurality of fixing threaded holes 531 are arranged in the circumferential direction of the limiting plate 53 , and the number of the fixing threaded holes 531 in this embodiment is also four.

[0074] A second installation through hole 412 is provided on the installation plate 41, and the second installation through hole 412 is arranged in the circumferential direction of the first installation through hole 411; the shock-absorbing bolt passes through the second installation through hole 412, the shock-absorbing ring plate 52 and the fixed plate 51 in sequence and is threadedly connected with the fixed threaded hole 531; the fixed plate 51, the shock-absorbing ring plate 52 and the limit sleeve are fixedly connected into a whole.

[0075] The number of the shock absorbing bolts 54 is the same as the number of the circumferential holes 512. Therefore, four shock absorbing bolts 54 are also provided in this embodiment.

[0076] In one embodiment, a rigid sleeve 55 is provided in the shock absorbing sleeve 522. The shock absorbing bolt 54 passes through the rigid sleeve 55 and is threadedly connected to the fixed threaded hole 531. The rigid sleeve 55 plays two roles in the shock absorbing sleeve 522. The first role is to support the shock absorbing sleeve 522, thereby preventing the shock absorbing sleeve 522 from being deformed after the shock absorbing sleeve 522 is subjected to torque; the second role is to isolate the shock absorbing bolt 54, so that the shock absorbing bolt 54 will not contact the shock absorbing sleeve 522, so that the bolt can smoothly pass through the rigid sleeve 55 and be threadedly connected to the fixed threaded hole 531.

[0077] The structure of this embodiment is similar to that of Embodiment 1 or Embodiment 2, except that the motor 2 includes a first motor shell 22 and a second motor shell 23, and a plurality of heat dissipation holes 221 are provided through the first motor shell 22 and the second motor shell, and heat dissipation blades 231 are provided in the second motor shell 23 along the circumferential direction.

[0078] When the first motor shell 22 and the second motor shell 23 rotate, the heat dissipation blades 231 inside the first motor shell 22 and the second motor shell 23 will also rotate. The heat dissipation blades 231 generate wind force during the rotation process, thereby blowing the heat inside the motor 2 out from the heat dissipation holes 221, thereby effectively reducing the heat inside the motor 2, allowing the motor 2 to be used at a higher power.

[0079] In one embodiment, a flange ring 24 is fixedly provided on the outer circumference of the first motor housing 22, and the flange ring 24 is fixedly provided on the outside of the housing of the first motor 2 by welding. A plurality of first mounting holes 241 are provided on the flange ring 24, and a wind wheel mounting ring 31 is provided at the center of the centrifugal wind wheel 3. A wind wheel mounting hole 32 corresponding to the first mounting hole 241 is provided on the wind wheel mounting ring 31, and the first mounting hole 241 and the wind wheel mounting hole 32 are fixedly connected by a connecting member. The fixing member can be a bolt or a rivet. In this embodiment, the first mounting hole 241 is a threaded hole, so the first mounting hole 241 and the wind wheel mounting hole 32 are fixedly connected by a bolt.

[0080] The flange ring 24 is provided with a plurality of second mounting holes 242, and the end surface of the opening of the second motor housing is provided with a housing mounting hole 232, and the housing mounting hole 232 is fixedly connected to the second mounting hole 242 through a connecting piece. In this embodiment, the second mounting holes 242 and the first mounting holes 241 are arranged alternately, and the second mounting holes 242 are also threaded holes, so the second motor housing and the flange ring 24 are fixedly connected together by bolts.

[0081] A flange ring 24 is provided to mount both the second motor housing 23 and the centrifugal wind wheel 3, thereby making the overall structure simpler, assembling more convenient, and improving production efficiency.

[0082] In the present invention, the motor 2 is fixedly mounted inside the volute 1 through the bracket assembly 4, which enables the motor 2 to be located in the middle position of the volute 1, that is, the motor 2 is fixedly mounted in the middle position of the axis of the centrifugal wind wheel 3, so that the motor 2 will not affect the air intake at both ends of the first air inlet channel 11 and the second air inlet channel 12. The centrifugal wind wheel 3 is fixedly mounted on the outer shell of the motor 2. When the motor 2 rotates, the motor 2 drives the centrifugal wind wheel 3 to rotate, ensuring the air intake efficiency of the centrifugal wind wheel 3. In addition, the motor 2 is installed in the center position of the volute 1 through the bracket assembly 4, and the bracket assembly 4 has a simple structure, which can improve the installation efficiency of the double-inlet centrifugal fan of the present application.

[0083] When the central shaft 21 is subjected to torque and vibrates, the torque of the central shaft 21 will be transmitted to the fixed plate 51. After the fixed plate 51 bears the torque, it will transmit the torque to the shock-absorbing sleeve 522. The shock-absorbing sleeve 522 is made of rubber material and has a buffering and shock-absorbing effect. The shock-absorbing sleeve 522 absorbs the torque, thereby playing a buffering and shock-absorbing role, thereby absorbing the torque in the circumferential direction of the central shaft 21, thereby reducing the vibration of the double-inlet centrifugal fan.

[0084] Example 4: Reference Figures 9 to 12 As shown, the structure of this embodiment is similar to that of embodiment 1, embodiment 2 or embodiment 3, except that an axial buffer assembly 6 is provided at both ends of the central shaft 21, and the axial buffer assembly 6 includes a buffer washer 61, a limit washer 62 and a limit member 63 provided on the side of the mounting plate 41 away from the motor 2, and the limit member 63 passes through the limit washer 62 and the buffer washer 61 and is threadedly connected to the axial hole of the central shaft 21. The buffer washer 61 in this embodiment is a rubber washer, and when the central shaft 21 moves axially, the buffer washer 61 can play a good buffering and shock-absorbing role in the axial transmission of the central shaft 21.

[0085] Since one end of the center shaft 21 is open, the wire at the open end is connected from the outside to the inside of the motor 1, so a thread is provided on the outer surface of the end, and the limiter 63 is a nut that cooperates with the outer side of the center shaft 21; and the other end of the center shaft 21 does not need to extend the wire, so a threaded hole is provided in the center of the end, and the bolt passes through the limit washer 62 and the buffer washer 61 and is threadedly connected to the center shaft 21.

[0086] A thread is disposed on the outer surface of the other end of the central shaft 21 . The central shaft 21 passes through the mounting plate 41 and is connected to a nut, thereby limiting the position of the central shaft 21 .

[0087] In one embodiment, the fixed disk 51 includes a plurality of overlapping fixed sheets 513, a plurality of fixing grooves 514 are arranged in the circumferential direction of the fixed sheets 513, and a fixing ridge 515 corresponding to the fixing groove 514 is arranged on the other end surface of the fixed sheet 513. When adjacent fixed sheets 513 are overlapped, the fixing ridges 515 on the adjacent fixed sheets 513 cooperate with the fixing grooves 514. The two ends of the fixing ridge 515 are fixedly connected to the fixed sheets 513, and the middle part is hollowed out to form an arched spring sheet. When the central shaft 21 is subjected to axial transmission, the fixing sheets 513 in the fixed disk 51 squeeze each other for buffering, thereby playing the function of buffering and shock absorbing the axial movement of the central shaft 21.

[0088] That is to say, the fixed plate 51 cooperates with the shock-absorbing ring plate and the limiting plate 53 to play the role of axial shock absorption and circumferential shock absorption, and has a good shock absorption effect.

[0089] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A double-inlet centrifugal fan, characterized in that it comprises: A volute, wherein a centrifugal wind wheel is arranged in the volute, and a first air inlet channel and a second air inlet channel are respectively arranged on both sides of the volute corresponding to the centrifugal wind wheel; The motor, the centrifugal wind wheel is fixedly arranged on the outer ring of the motor; the center of the motor is provided with a central shaft, and both ends of the central shaft are fixedly arranged inside the volute through a bracket assembly; The bracket assembly includes a mounting plate and a plurality of mounting brackets, which are arranged along the circumferential direction of the mounting plate; both ends of the central axis are passed through the mounting plate for axial fixation, and one end of the mounting bracket away from the mounting plate is fixedly connected to the volute.

2. The double-inlet centrifugal fan according to claim 1, characterized in that: A shock absorbing assembly is arranged on one side of the mounting plate facing the motor; the shock absorbing assembly comprises: A fixed disk, wherein a non-circular hole matching the central axis is arranged at the center of the fixed disk; at least four circumferential holes are distributed in the circumferential direction of the non-circular hole; Two shock-absorbing ring discs, both of which are provided with ring disc holes corresponding to the circumferential holes in the circumferential direction, and vibration-absorbing sleeves are arranged at intervals along the ring disc holes on one end surface of the shock-absorbing ring disc, and the vibration-absorbing sleeves are made of a material with a buffering effect; the two shock-absorbing ring discs are symmetrically arranged on both sides of the fixed disc, and the vibration-absorbing sleeves on the two shock-absorbing ring discs are staggered and penetrated in the circumferential holes; A limiting plate is arranged on a side of the two shock-absorbing ring plates away from the mounting plate; The vibration-damping bolt passes through the mounting plate, the vibration-damping ring plate and the fixing plate in sequence and is fixedly connected with the limiting plate.

3. The double-inlet centrifugal fan according to claim 1, characterized in that: The motor comprises a first motor shell and a second motor shell. A plurality of heat dissipation holes are provided through the first motor shell and the second motor shell. Heat dissipation blades are provided in the second motor shell along a circumferential direction.

4. The double-inlet centrifugal fan according to any one of claims 1 to 3, characterized in that: The mounting bracket comprises a first mounting frame and a second mounting frame fixedly connected to the mounting plate. The first mounting frame and the second mounting frame are provided with mounting plates at one end away from the mounting plate, and the mounting plates are fixedly connected to the volute.

5. The double-inlet centrifugal fan according to claim 2, characterized in that: The number of the shock absorbing bolts is the same as the number of the circumferential holes.

6. The double-inlet centrifugal fan according to claim 2 or 5, characterized in that: A rigid sleeve is arranged inside the shock-absorbing sleeve.

7. The double-inlet centrifugal fan according to claim 3, characterized in that: A flange ring is fixedly provided on the outer circumference of the first motor housing, and a plurality of first mounting holes are provided on the flange ring. A wind wheel mounting ring is centrally installed on the centrifugal wind wheel, and a wind wheel mounting hole corresponding to the first mounting hole is provided on the wind wheel mounting ring. The first mounting hole and the wind wheel mounting hole are fixedly connected by a connecting piece.

8. The double-inlet centrifugal fan according to claim 5, characterized in that: A plurality of second mounting holes are arranged on the flange ring, a housing mounting hole is arranged at the opening of the second motor housing, and the housing mounting hole is fixedly connected with the second mounting hole through a connecting piece.

9. The double-inlet centrifugal fan according to claim 1 or 2 or 3 or 5 or 7, characterized in that: Axial buffer components are arranged at both ends of the central shaft, and the axial buffer components include a buffer gasket, a limit gasket and a limit piece arranged on the side of the mounting plate away from the motor. The limit piece passes through the limit gasket and the buffer gasket and is threadedly connected to the central shaft.

10. The double-inlet centrifugal fan according to claim 2 or 5, characterized in that: The fixing plate includes a plurality of overlapping fixing plates, a plurality of fixing grooves are arranged in the circumferential direction of the fixing plates, and a fixing ridge corresponding to the fixing groove is arranged on the other end surface of the fixing plate; when adjacent fixing plates are overlapped, the fixing ridges on the adjacent fixing plates cooperate with the fixing grooves.

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