Single-air-inlet centrifugal fan

Abstract

The invention relates to the field of centrifugal fans, in particular to a single-air-inlet centrifugal fan which comprises a volute with a side air inlet and an end air outlet, and a flange is formed on the periphery of the end air outlet of the volute. A mounting ring groove is coaxially formed in the inner circumferential wall of the connecting ring; the outer circumferential ring of the flange is circular and extends into the mounting ring groove, and the inner diameter of the inner circumferential wall of the mounting ring groove is larger than the outer diameter of the flange; the device further comprises a buffering device, the buffering device comprises a first buffering assembly, and the first buffering assembly comprises a first protrusion, a second protrusion and a first elastic piece. The first bulge is fixedly connected to the peripheral wall of the flange; the second bulge is fixedly connected to the inner wall of the mounting ring groove; the first elastic piece is connected between the first protrusion and the second protrusion, and when the first elastic piece is in a recoverable deformation state, force for pushing the first protrusion and the second protrusion to move so as to increase the distance between the first protrusion and the second protrusion is stored. The volute has the effect of reducing volute breakage caused by too large wind power.

Description

Technical Field

[0001] The present application relates to the field of centrifugal fans, and in particular to a single-inlet centrifugal fan. Background Art

[0002] As a common air flow equipment, centrifugal fans are widely used in ventilation engineering and other fields, especially in offshore environments, where the demand for centrifugal fans is more urgent due to strong winds and waves. Traditional centrifugal fans are mainly composed of volutes, fan blades, motors and other components. The fan blades are driven by the motor to rotate, sucking air from the air inlet and discharging it through the air outlet to achieve effective air circulation.

[0003] In practical applications, in order to ensure the stable operation of centrifugal fans, especially in rough sea conditions, it is usually necessary to take certain measures to deal with the impact of airflow on the volute. Common solutions include but are not limited to: (1) using a rigid connection between the volute and the external pipe to enhance the stability of the overall structure; (2) adding a support structure inside the volute, such as a reinforcing rib plate, to improve the rigidity and vibration resistance of the volute; (3) setting a flexible connection between the volute and the external pipe, such as a rubber gasket, to absorb some vibration and impact.

[0004] Although the above method can reduce the impact of airflow on the volute to a certain extent, in the case of strong winds and waves at sea, the volute may still shake significantly due to the strong wind force, which may cause the screws at the connection between the volute and the external pipe to loosen or even break, affecting the normal operation of the fan. Therefore, how to further reduce the occurrence of volute breakage caused by excessive wind force has become a technical problem that needs to be solved urgently. Summary of the invention In order to reduce the occurrence of volute breakage due to excessive wind force, the present application provides a single-inlet centrifugal fan.

[0005] The single-inlet centrifugal fan provided in this application adopts the following technical solution: A single-inlet centrifugal fan, comprising: A volute having a side air inlet and an end air outlet, wherein the volute has a flange formed on the outer periphery of the end air outlet; A connecting ring, wherein the connecting ring is coaxially provided with a mounting ring groove on the inner peripheral wall; the outer peripheral circle of the flange is circular, the outer peripheral circle of the flange extends into the mounting ring groove, and the inner diameter of the inner peripheral wall of the mounting ring groove is greater than the outer diameter of the flange; and A buffer device, the buffer device comprising a first buffer component, the first buffer component comprising: A first protrusion, wherein the first protrusion is fixedly connected to the outer peripheral wall of the flange; A second protrusion, the second protrusion being fixedly connected to the inner wall of the mounting ring groove; and A first elastic member is connected between the first protrusion and the second protrusion. When the first elastic member is in a recoverable deformation state, it stores a force for pushing the first protrusion and the second protrusion to move so as to increase the distance between the first protrusion and the second protrusion.

[0006] By adopting the above technical solution, the wind impact force on the volute of the centrifugal fan can be effectively buffered under the action of airflow; specifically, the first elastic member can effectively absorb and disperse the impact force, thereby reducing the vibration and shaking amplitude of the volute and its connection, preventing the screws at the connection between the volute and the external pipeline from loosening or even breaking due to excessive wind force, thereby ensuring the stable operation of the fan.

[0007] Optionally, a plurality of the buffer devices are distributed at intervals in the circumferential direction of the connecting ring.

[0008] By adopting the above technical solution, multiple buffer devices are distributed at intervals in the circumferential direction of the connecting ring, which can ensure that the impact caused by the wind is evenly dispersed and buffered at different positions, thereby effectively reducing the shaking amplitude of the volute under the action of wind, reducing the risk of loosening or breaking the screws at the connection between the volute and the external pipeline, and improving the stability and reliability of the entire centrifugal fan system.

[0009] Optionally, the first buffer assembly includes two first protrusions, and in the circumferential direction of the connecting ring, the second protrusion is located between the two first protrusions, and each of the second protrusions is correspondingly connected to the first protrusion via the first elastic member.

[0010] By adopting the above-mentioned technical solution, the impact force caused by the wind can be effectively dispersed, so that each first elastic member can perform multi-point buffering on the second protrusion in the circumferential direction of the connecting ring, thereby improving the uniformity and reliability of the buffering, thereby further reducing the shaking amplitude of the volute under the action of strong wind, enhancing the connection stability between the volute and the connecting ring, and reducing the risk of loosening or breaking the screws at the connection between the volute and the external pipe.

[0011] Optionally, a universal hinge assembly is further included, and one universal hinge assembly is correspondingly connected to each of the two ends of the first elastic member, and the universal hinge assembly includes: A universal ball, the universal ball being fixedly connected to an end of the first elastic member; and A ball seat, the universal ball is universally rotatably connected to the ball seat; At one end where the first elastic member is connected to the first protrusion, the ball seat is fixedly connected to the first protrusion; At one end where the first elastic member is connected to the second protrusion, the ball seat is directly or indirectly connected to the second protrusion.

[0012] By adopting the above technical solution, the setting of the universal hinge assembly enables the first elastic member to freely adjust its angle when subjected to multi-directional forces, thereby more effectively buffering impact forces in different directions and improving the seismic performance of the entire system.

[0013] Optionally, in the first direction, the thickness of the flange is smaller than the length of the mounting ring groove in the first direction.

[0014] By adopting the above technical solution, the thickness of the flange is smaller than the length of the mounting ring groove in the first direction, so that the flange can swing in the mounting ring groove along the first direction. Therefore, under the vibration and impact caused by the airflow, since the first elastic member is universally hinged, the first elastic member can also reduce a certain impact force in the first direction.

[0015] Optionally, a sliding assembly is further included, and each of the first elastic members and the second protrusions is correspondingly connected with the sliding assembly, and the sliding assembly includes: a slider, the slider being slidably connected to the second protrusion along a first direction, the ball seat being fixedly connected to the slider at one end where the first elastic member is indirectly connected to the second protrusion; and A second elastic member, wherein the expansion and contraction direction of the second elastic member is parallel to the first direction, one end of the second elastic member is fixedly connected to the slider, and the other end of the second elastic member is fixedly connected to the second protrusion.

[0016] By adopting the above technical solution, when the volute shakes due to wind force, the slider slides along the first direction, and the second elastic member can buffer the movement of the slider, reduce and absorb a certain impact force, which further weakens the impact force in the first direction.

[0017] Optionally, in the radial direction of the connecting ring, a first gap is formed between the first protrusion and the inner peripheral wall of the mounting ring groove, and a second gap is formed between the second protrusion and the outer peripheral wall of the flange; The buffer device further includes a second buffer assembly, the second buffer assembly includes two wedge blocks distributed along the second direction, the wedge blocks are located at the second gap, the sides of the two wedge blocks close to each other are wedge surfaces, the two wedge surfaces are inclined toward one side of the central axis of the connecting ring in the direction of approaching each other, and the edges of the second protrusions close to the wedge surfaces are in contact with the wedge surfaces; and A third elastic member, one end of the third elastic member is fixedly connected to the wedge block, and the other end is fixedly connected to the first protrusion, and the expansion and contraction direction of the third elastic member is parallel to the second direction.

[0018] By adopting the above technical solution, the wedge block and the third elastic member in the second buffer assembly can effectively buffer the impact force along the radial direction of the connecting ring. The wedge block disperses the impact force in the first direction to both sides, thereby weakening the impact force in the first direction.

[0019] Optionally, a telescopic rod is connected between the wedge block and the first protrusion, and a telescopic direction of the telescopic rod is parallel to the second direction.

[0020] By adopting the above technical solution, the arrangement of the telescopic rod can effectively guide the sliding of the wedge block in the second direction, ensuring that the wedge block can move smoothly along a predetermined path when subjected to wind force.

[0021] Optionally, also include: A double-sided outer rotor motor, wherein the double-sided outer rotor motor is fixedly connected to the volute; and The fan blades are located at the side air inlet and are connected to the output shaft of the double-sided outer rotor motor.

[0022] By adopting the above technical solution, the double-sided outer rotor motor is fixedly connected to the volute, and the fan blades are located at the side air inlet and connected to the output shafts of the double-sided outer rotor motors, so that the fan blades can operate efficiently under the drive of the motor, introduce the airflow from the side air inlet into the volute, and discharge it through the end exhaust port, ensuring the smooth flow of air.

[0023] Optionally, it also includes a protective net fixedly connected to the volute, wherein the protective net is located at the side air inlet and on the side of the fan blade close to the outside of the volute.

[0024] By adopting the above technical solution, the protective net can effectively reduce the entry of foreign matter into the fan, protect the fan blades from damage, and thus extend the service life of the fan.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The first elastic member can effectively absorb and disperse the impact force, thereby reducing the vibration and shaking amplitude of the volute and its connection, preventing the screws at the connection between the volute and the external pipe from loosening or even breaking due to excessive wind force, and ensuring the stable operation of the fan; 2. The second elastic member and the third elastic member are arranged to absorb and weaken the impact force from multiple directions to reduce the occurrence of volute breakage; 3. The double-sided outer rotor motor is fixedly connected to the volute, and the fan blades are located at the side air inlet and connected to the output shafts of the double-sided outer rotor motors, so that the fan blades can operate efficiently under the drive of the motor, introduce the airflow from the side air inlet into the volute, and discharge it through the end exhaust port, ensuring the smooth flow of air. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the structure of the volute and the fan blades in the embodiment of the present application; Figure 2 It is a schematic diagram of the structure of the protective net in the embodiment of the present application; Figure 3 It is a structural schematic diagram of the flange in the embodiment of the present application; Figure 4 is a schematic diagram of the structure of the connecting ring in the embodiment of the present application; Figure 5 is a schematic structural diagram of the first buffer component in an embodiment of the present application; Figure 6 is a schematic structural diagram of a universal hinge assembly in an embodiment of the present application; Figure 7 It is a schematic diagram of the structure of the sliding assembly in the embodiment of the present application; Figure 8 It is a schematic diagram of the structure of the second buffer component in the embodiment of the present application.

[0027] Explanation of the reference numerals: 1. volute; 101. side air inlet; 102. end air outlet; 11. mounting frame; 12. fan blades; 13. double-sided outer rotor motor; 14. protective net; 2. flange; 3. connecting ring; 31. mounting ring groove; 4. first buffer assembly; 41. first protrusion; 411. first gap; 42. second protrusion; 421. second gap; 43. first elastic member; 5. universal hinge assembly; 51. universal ball; 52. ball seat; 6. sliding assembly; 61. guide rail; 62. slider; 63. stop block; 64. second elastic member; 7. second buffer assembly; 71. wedge block; 711. wedge surface; 72. third elastic member; 73. telescopic rod. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-8 For the convenience of description, the present application introduces directional words such as the first direction and the second direction, which can be specifically shown in the figure, where X represents the first direction X and Y represents the second direction Y.

[0029] The present application embodiment discloses a single-inlet centrifugal fan. Figure 1 and Figure 2 , a single-inlet centrifugal fan comprises a volute 1, a mounting frame 11, fan blades 12 and a double-sided outer rotor motor 13 having two output shafts; The volute 1 has a side air inlet 101 and an end air outlet 102, and the air flow enters the volute 1 through the side air inlet 101 and is discharged from the end air outlet 102; the mounting frame 11 is located in the volute 1 and is fixedly connected to the volute 1, the casing of the double-sided outer rotor motor 13 is fixedly connected to the mounting frame 11, and the output shaft of the double-sided outer rotor motor 13 near the side air inlet 101 is fixedly connected to the fan blade 12, and the fan blade 12 is located at the side air inlet 101. After the double-sided outer rotor motor 13 is started, the fan blade 12 is driven to rotate, and during the rotation of the fan blade 12, the air flow is transported from the side air inlet 101 to the end air outlet 102; in order to protect the fan blade 12, the volute 1 is fixedly connected with a protective net 14 at the side air inlet 101, and the protective net 14 is located on the side of the fan blade 12 close to the outside of the volute 1.

[0030] Reference Figure 3 The volute 1 is formed with a flange 2 at the end of the exhaust port 102, and the outer circumference of the flange 2 is circular; Reference Figure 4 and Figure 5 The centrifugal fan also includes a connecting ring 3, the central axis of the connecting ring 3 is parallel to the first direction, and the connecting ring 3 is coaxially provided with a mounting ring groove 31 on the inner circumferential wall, the flange 2 is located in the connecting ring 3 and the outer circumference of the flange 2 is inserted in the mounting ring groove 31; in the first direction, the thickness of the mounting ring groove 31 is greater than the thickness of the flange 2 in the first direction, so that the flange 2 can swing along the first direction in the mounting ring groove 31; in addition, a virtual plane perpendicular to the first direction is named as a reference plane, and on the reference plane, the diameter of the inner circumferential wall of the mounting ring groove 31 is greater than the outer diameter of the flange 2, so that the flange 2 can swing along the reference plane in the mounting ring groove 31; in order to weaken the impact force generated by the shaking, a buffer device is provided between the flange 2 and the connecting ring 3; in some embodiments of the present application, a plurality of buffer devices are provided between the flange 2 and the connecting ring 3, and the plurality of buffer devices are arranged at intervals in the circumferential direction of the connecting ring 3. In the present disclosure, the plurality of buffer devices are evenly distributed in the circumferential direction of the connecting ring 3.

[0031] Reference Figure 5 and Figure 6 The buffer device includes a first buffer component 4, and the first buffer component 4 includes a first protrusion 41, a second protrusion 42 and a first elastic member 43; The first protrusion 41 is fixedly connected to the outer peripheral wall of the flange 2, and the second protrusion 42 is fixedly connected to the inner peripheral wall of the mounting ring groove 31. In the circumferential direction of the connecting ring 3, the first protrusion 41 and the second protrusion 42 are spaced apart. One end of the first elastic member 43 is connected to the first protrusion 41, and the other end is connected to the second protrusion 42. In the present disclosure, the first elastic member 43 is a compression spring. In the circumferential direction of the connecting ring 3, when the spacing between the first protrusion 41 and the second protrusion 42 is reduced, the deformation of the first elastic member 43 increases, and a force is stored to drive the first protrusion 41 and the second protrusion 42 to move toward a side away from each other, so as to buffer the impact force between the first protrusion 41 and the second protrusion 42 through the first elastic member 43. In some embodiments of the present application, each buffer device has one second protrusion 42, two first protrusions 41, and multiple first elastic members 43. In the circumferential direction of the connecting ring 3, the second protrusion 42 is located between the two first protrusions 41, and at least one first elastic member 43 is connected between each first protrusion 41 and the second protrusion 42, so that both ends of the second protrusion 42 in the circumferential direction of the connecting ring 3 can be buffered. In some embodiments of the present application, a universal hinge assembly 5 is provided at both ends of each first elastic member 43, and the universal hinge assembly 5 includes a universal ball 51 and a ball seat 52. The end of the first elastic member 43 is fixedly connected to the universal ball 51, and the universal ball 51 is universally rotatably connected to the ball seat 52; the ball seat 52 connected to the first protrusion 41 is fixedly connected to the first protrusion 41, and the ball seat 52 connected to the second protrusion 42 is directly or indirectly connected to the second protrusion 42.

[0032] Reference Figure 6 and Figure 7In some embodiments of the application, the first elastic member 43 can move on the second protrusion 42 along the first direction. In order to realize the movement of the first elastic member 43, a sliding assembly 6 is provided between the first elastic member 43 and the second protrusion 42. The sliding assembly 6 includes a guide rail 61, a slider 62, two stoppers 63 and two second elastic members 64. The guide rail 61 is fixedly connected to the second protrusion 42, and the guide rail 61 is parallel to the first direction. The slider 62 is adaptively mounted on the guide rail 61 and can move on the guide rail 61 along the first direction. The ball seat 52 connected to the second protrusion 42 is fixedly connected to the slider 62 to slide along the first direction with the slider 62. A stopper 63 is correspondingly provided at each end of the guide rail 61, and the stopper 63 is fixedly connected to the second protrusion 42; in the first direction, the slider 62 is located between the two stoppers 63, and a second elastic member 64 is correspondingly connected between each stopper 63 and the slider 62, and one end of the second elastic member 64 is fixedly connected to the slider 62, and the other end is fixedly connected to the stopper 63; in the present disclosure, the second elastic member 64 is a compression spring, and the expansion and contraction direction of the second elastic member 64 is parallel to the first direction, and the second elastic member 64 stores pre-pressure, that is, the second elastic member 64 is in a compressed state, so as to provide a deformation spacing for the expansion and contraction of the second elastic member 64 along the first direction.

[0033] Reference Figure 8 A first gap 411 is formed between the first protrusion 41 and the inner peripheral wall of the mounting ring groove 31, and a second gap 421 is formed between the second protrusion 42 and the outer peripheral wall of the flange 2, so that the flange 2 can move along the diameter direction of the connecting ring 3. In order to perform buffering, in some embodiments of the present application, the buffer device also includes a second buffer component 7, and the second buffer component 7 includes a wedge block 71 and a third elastic member 72. The wedge block 71 is located at the second gap 421, and the wedge block 71 is slidably connected to the flange along the second direction. 2. In the circumferential direction of the connecting ring 3, the tangent direction at the position of the wedge block 71 is the second direction; there are two wedge blocks 71 in the buffer device, and in the second direction, the second protrusion 42 is located between the two wedge blocks 71, and the wall surfaces of the two wedge blocks 71 close to each other are wedge surfaces 711, and in the direction from the inner peripheral wall of the mounting ring groove 31 to the outer peripheral wall of the flange 2, the two wedge surfaces 711 are inclined toward the side close to each other; one end of the second protrusion 42 close to the outer peripheral wall of the flange 2 is in contact with the wedge surface 711; The third elastic member 72 is a compression spring, one end of the third elastic member 72 is fixedly connected to the wedge block 71, and the other end is fixedly connected to the first protrusion 41; the expansion and contraction direction of the third elastic member 72 is parallel to the second direction, and the third elastic member 72 stores a pre-pressure to provide a deformation spacing for the expansion and contraction of the third elastic member 72 along the second direction, so that the wedge block 71 can slide in the second direction; In order to guide the movement of the wedge block 71, in some embodiments of the present application, a telescopic rod 73 is correspondingly provided at one end of the two wedge blocks 71 that are away from each other, one end of the telescopic rod 73 is fixedly connected to the first protrusion 41, and the other end is fixedly connected to the wedge block 71, and the telescopic direction of the telescopic rod 73 is parallel to the second direction.

[0034] The implementation principle of a single-inlet centrifugal fan in the embodiment of the present application is as follows: the connecting ring 3 is fixedly installed on the air duct by screws, and the double-sided outer rotor motor 13 drives the fan blades 12 to rotate, and the airflow is transported from the side air inlet 101 to the end air outlet 102 and discharged; In the process of conveying airflow, affected by the airflow, the volute 1 will be subjected to greater wind force, and in this process, the first elastic member 43, the second elastic member 64 and the third elastic member 72 can buffer the wind force in all directions, so that the volute 1 is shaken under the blowing of wind, but there is a multi-directional shock-absorbing structure, which reduces the impact force exerted by the wind on the volute 1 and causes the volute 1 to break from the connection, and can also reduce the occurrence of screw breakage at the connection between the connecting ring 3 and the air duct.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A single-inlet centrifugal fan, characterized in that: include: A volute (1) having a side air inlet (101) and an end air outlet (102), wherein the volute (1) is provided with a flange (2) on the outer periphery of the end air outlet (102); A connecting ring (3), wherein the connecting ring (3) is coaxially provided with a mounting ring groove (31) on the inner peripheral wall; the outer peripheral ring of the flange (2) is circular, the outer peripheral ring of the flange (2) extends into the mounting ring groove (31), and the inner diameter of the inner peripheral wall of the mounting ring groove (31) is greater than the outer diameter of the flange (2); as well as A buffer device, the buffer device comprising a first buffer component (4), the first buffer component (4) comprising: A first protrusion (41), wherein the first protrusion (41) is fixedly connected to the outer peripheral wall of the flange (2); a second protrusion (42), the second protrusion (42) being fixedly connected to the inner wall of the mounting ring groove (31); and A first elastic member (43), wherein the first elastic member (43) is connected between the first protrusion (41) and the second protrusion (42), and when the first elastic member (43) is in a recoverable deformation state, it stores a force for pushing the first protrusion (41) and the second protrusion (42) to move so as to increase the distance between the first protrusion (41) and the second protrusion (42).

2. A single-inlet centrifugal fan according to claim 1, characterized in that: A plurality of buffer devices are distributed at intervals in the circumferential direction of the connecting ring (3).

3. A single-inlet centrifugal fan according to claim 2, characterized in that: The first buffer assembly (4) comprises two first protrusions (41); in the circumferential direction of the connecting ring (3), the second protrusion (42) is located between the two first protrusions (41); and each second protrusion (42) is connected to the first protrusion (41) via the first elastic member (43).

4. A single-inlet centrifugal fan according to claim 2, characterized in that: It also includes a universal hinge assembly (5), wherein two ends of the first elastic member (43) are respectively connected to a universal hinge assembly (5), and the universal hinge assembly (5) includes: A universal ball (51), the universal ball (51) being fixedly connected to an end of the first elastic member (43); and A ball seat (52), the universal ball (51) being adapted to be universally rotatably connected to the ball seat (52); At one end where the first elastic member (43) is connected to the first protrusion (41), the ball seat (52) is fixedly connected to the first protrusion (41); At one end where the first elastic member (43) is connected to the second protrusion (42), the ball seat (52) is directly or indirectly connected to the second protrusion (42).

5. A single-inlet centrifugal fan according to claim 4, characterized in that: In the first direction, the thickness of the flange (2) is smaller than the length of the mounting ring groove (31) in the first direction.

6. A single-inlet centrifugal fan according to claim 5, characterized in that: The invention also comprises a sliding assembly (6), wherein each of the first elastic members (43) and the second protrusions (42) is correspondingly connected with the sliding assembly (6), and the sliding assembly (6) comprises: a slider (62), the slider (62) being slidably connected to the second protrusion (42) along a first direction, the ball seat (52) being fixedly connected to the slider (62) at one end where the first elastic member (43) is indirectly connected to the second protrusion (42); and A second elastic member (64), the expansion and contraction direction of the second elastic member (64) is parallel to the first direction, one end of the second elastic member (64) is fixedly connected to the slider (62), and the other end is fixedly connected to the second protrusion (42).

7. A single-inlet centrifugal fan according to claim 6, characterized in that: In the radial direction of the connecting ring (3), a first gap (411) is formed between the first protrusion (41) and the inner peripheral wall of the mounting ring groove (31), and a second gap (421) is formed between the second protrusion (42) and the outer peripheral wall of the flange (2); The buffer device further comprises a second buffer component (7), the second buffer component (7) comprising two wedge blocks (71) distributed along a second direction, the wedge blocks (71) being located at the second gap (421), the surfaces of the two wedge blocks (71) approaching each other being a wedge surface (711), the two wedge surfaces (711) being inclined toward one side of the central axis of the connecting ring (3) in a direction of approaching each other, and the edges of the second protrusions (42) close to the wedge surfaces (711) being in contact with the wedge surfaces (711); and A third elastic member (72), one end of the third elastic member (72) is fixedly connected to the wedge block (71), and the other end is fixedly connected to the first protrusion (41), and the expansion and contraction direction of the third elastic member (72) is parallel to the second direction.

8. The single-inlet centrifugal fan according to claim 7, characterized in that: A telescopic rod (73) is connected between the wedge block (71) and the first protrusion (41), and the telescopic direction of the telescopic rod (73) is parallel to the second direction.

9. A single-inlet centrifugal fan according to any one of claims 1 to 8, characterized in that: Also includes: A double-sided outer rotor motor (13), wherein the double-sided outer rotor motor (13) is fixedly connected to the volute (1); as well as A fan blade (12), wherein the fan blade (12) is located at the side air inlet (101), and the fan blade (12) is connected to the output shaft of the double-sided outer rotor motor (13).

10. The single-inlet centrifugal fan according to claim 9, characterized in that: It also comprises a protective net (14) fixedly connected to the volute (1), wherein the protective net (14) is located at the side air inlet (101) and is located on a side of the fan blade (12) close to the outside of the volute (1).

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