Single-inlet centrifugal fan

Abstract

This application relates to a single-inlet centrifugal fan, belonging to the field of centrifugal fans. It includes a volute with a side air inlet and an end air outlet, the volute having a flange formed around the outer periphery of the end air outlet; it also includes a connecting ring, the connecting ring having a mounting groove coaxially formed on its inner peripheral wall; the outer periphery of the flange is circular, extending into the mounting groove, and the inner diameter of the mounting groove is larger than the outer diameter of the flange; it further includes a buffer device, the buffer device including a first buffer assembly, the first buffer assembly including a first protrusion, a second protrusion, and a first elastic element; the first protrusion is fixedly connected to the outer peripheral wall of the flange; the second protrusion is fixedly connected to the inner wall of the mounting groove; the first elastic element is connected between the first protrusion and the second protrusion, and when the first elastic element is in a recoverable deformation state, it stores a force capable of pushing the first and second protrusions to move to increase the distance between the first and second protrusions. This application has the effect of reducing volute breakage due to excessive wind force.

Description

Technical Field

[0001] This application relates to the field of centrifugal fans, and more particularly to a single-inlet centrifugal fan. Background Technology

[0002] Centrifugal fans, as a common airflow device, are widely used in ventilation engineering and other fields, especially in marine environments where the demand for centrifugal fans is even more urgent due to the large waves. Traditional centrifugal fans mainly consist of components such as a volute, fan blades, and a motor. The motor drives the fan blades to rotate, drawing air in from the inlet and expelling it through the outlet, thus achieving effective air circulation.

[0003] In practical applications, in order to ensure the stable operation of centrifugal fans, especially in environments with large winds and waves at sea, certain measures are usually required to deal with the impact of airflow on the volute. Common solutions include, but are not limited to: (1) using rigid connections at the connection between the volute and the external pipe to enhance the stability of the overall structure; (2) adding supporting structures inside the volute, such as reinforcing ribs, to improve the rigidity and vibration resistance of the volute; (3) setting flexible connectors, such as rubber gaskets, between the volute and the external pipe to absorb some vibration and impact.

[0004] While the above methods can mitigate the impact of airflow on the volute to some extent, in rough seas, the volute may still experience significant swaying due to strong winds, potentially causing the bolts connecting the volute to the external duct to loosen or even break, thus affecting the normal operation of the wind turbine. Therefore, how to further reduce the occurrence of volute breakage due to excessive wind force has become an urgent technical problem to be solved. Summary of the Invention

[0005] To reduce the occurrence of casing breakage due to excessive wind force, this application provides a single-inlet centrifugal fan.

[0006] The single-inlet centrifugal fan provided in this application adopts the following technical solution:

[0007] A single-inlet centrifugal fan, comprising:

[0008] A volute having a side air inlet and an end air outlet, wherein a flange is formed around the outer periphery of the end air outlet;

[0009] A connecting ring, wherein a mounting groove is coaxially formed on the inner circumferential wall of the connecting ring; the outer circumference of the flange is circular, extending into the mounting groove, and the inner diameter of the inner circumferential wall of the mounting groove is larger than the outer diameter of the flange; and

[0010] The buffer device includes a first buffer assembly, the first buffer assembly comprising:

[0011] The first protrusion is fixedly connected to the outer peripheral wall of the flange;

[0012] The second protrusion is fixedly connected to the inner wall of the mounting annular groove; and

[0013] A first elastic element is connected between the first protrusion and the second protrusion. When the first elastic element is in a recoverable deformation state, it stores a force that can push the first protrusion and the second protrusion to move to increase the distance between the first protrusion and the second protrusion.

[0014] By adopting the above technical solution, the centrifugal fan can effectively buffer the wind impact force on the volute under the action of airflow. Specifically, the first elastic element can effectively absorb and disperse the impact force, thereby reducing the vibration and swaying 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.

[0015] Optionally, multiple buffer devices are distributed at intervals around the circumference of the connecting ring.

[0016] 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 of wind force is evenly distributed and buffered at different positions, thereby effectively reducing the sway amplitude of the volute under the action of wind force, reducing the risk of loosening or breaking of screws at the connection between the volute and the external pipe, and improving the stability and reliability of the entire centrifugal fan system.

[0017] 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 connected to the first protrusion via the first elastic element.

[0018] By adopting the above technical solution, the impact force caused by wind can be effectively dispersed, so that each first elastic element can buffer the second protrusion at multiple points in the circumferential direction of the connecting ring, thereby improving the uniformity and reliability of the buffer, further reducing the swaying 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 of the screws at the connection between the volute and the external pipe.

[0019] Optionally, it also includes a universal joint assembly, with one universal joint assembly connected to each end of the first elastic member, the universal joint assembly comprising:

[0020] A universal ball, wherein the universal ball is fixedly connected to the end of the first elastic member; and

[0021] A ball seat, wherein the universal ball adapter is rotatably connected to the ball seat;

[0022] At one end of the first elastic member that is connected to the first protrusion, the ball seat is fixedly connected to the first protrusion;

[0023] At the end where the first elastic element is connected to the second protrusion, the ball seat is directly or indirectly connected to the second protrusion.

[0024] By adopting the above technical solution, the universal joint assembly enables the first elastic element to freely adjust its angle when subjected to forces in multiple directions, thereby more effectively buffering impact forces from different directions and improving the seismic performance of the entire system.

[0025] Optionally, in the first direction, the thickness of the flange is less than the length of the mounting ring groove in the first direction.

[0026] By adopting the above technical solution, the thickness of the flange is less than the length of the mounting ring groove in the first direction, so that the flange can swing in the first direction within the mounting ring groove. Thus, under the vibration and impact caused by airflow, since the first elastic element is universally hinged, the first elastic element can also reduce a certain impact force in the first direction.

[0027] Optionally, it also includes a sliding component, wherein each of the first elastic element and the second protrusion is correspondingly connected by the sliding component, the sliding component comprising:

[0028] A slider, slidably connected to the second protrusion along a first direction, with a ball seat fixedly connected to the slider at one end where the first elastic element is indirectly connected to the second protrusion; and

[0029] The second elastic element has a telescoping direction parallel to the first direction. One end of the second elastic element is fixedly connected to the slider, and the other end is fixedly connected to the second protrusion.

[0030] By adopting the above technical solution, when the volute is shaken by wind, the slider slides in the first direction, and the second elastic element can buffer the movement of the slider, reduce and absorb a certain impact force, and further weaken the impact force in the first direction.

[0031] 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.

[0032] The buffer device further includes a second buffer assembly comprising two wedge-shaped blocks distributed along a second direction, the wedge-shaped blocks being located at the second gap, the sides of the two wedge-shaped blocks approaching each other forming a wedge-shaped surface, the two wedge-shaped surfaces being inclined toward the central axis of the connecting ring in the direction of approaching each other, and the edge of the second protrusion near the wedge-shaped surface contacting the wedge-shaped surface; and

[0033] The third elastic element has one end fixedly connected to the wedge block and the other end fixedly connected to the first protrusion. The extension and retraction direction of the third elastic element is parallel to the second direction.

[0034] By adopting the above technical solution, the wedge block and the third elastic element 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 reducing the impact force in the first direction.

[0035] Optionally, a telescopic rod is connected between the wedge block and the first protrusion, and the telescopic rod extends in a direction parallel to the second direction.

[0036] By adopting the above technical solution, 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 the predetermined path when subjected to wind force.

[0037] Optional, also includes:

[0038] A dual-sided external rotor motor, wherein the dual-sided external rotor motor is fixedly connected to the volute; and

[0039] The fan blades are located at the side air inlet and are connected to the output shaft of the dual-side external rotor motor.

[0040] By adopting the above technical solution, the dual-side external rotor motor is fixedly connected to the volute, and the fan blades are located at the side air inlet and connected to the output shaft of the dual-side external rotor motor, so that the fan blades can operate efficiently under the drive of the motor, introduce airflow into the volute from the side air inlet, and discharge it through the end air outlet, ensuring smooth airflow.

[0041] Optionally, a protective net is also included, which is fixedly connected to the volute. The protective net is located at the side air inlet and on the side of the fan blades near the outside of the volute.

[0042] By adopting the above technical solutions, the protective net can effectively reduce the entry of foreign objects into the fan, protect the fan blades from damage, and thus extend the service life of the fan.

[0043] In summary, this application includes at least one of the following beneficial technical effects:

[0044] 1. The first elastic element can effectively absorb and disperse the impact force, thereby reducing the vibration and sway 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.

[0045] 2. The second and third elastic elements can absorb and weaken impact forces from multiple directions to reduce the occurrence of volute breakage;

[0046] 3. The dual-side external rotor motor is fixedly connected to the volute. The fan blades are located at the side air inlet and connected to the output shaft of the dual-side external rotor motor, so that the fan blades can operate efficiently under the drive of the motor, introduce airflow into the volute from the side air inlet, and discharge it through the end air outlet, ensuring smooth airflow. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the structure of the volute and the fan blades in the embodiments of this application;

[0048] Figure 2 This is a schematic diagram of the protective net structure in an embodiment of this application;

[0049] Figure 3 This is a schematic diagram of the flange structure in an embodiment of this application;

[0050] Figure 4 This is a schematic diagram of the connecting ring structure in an embodiment of this application;

[0051] Figure 5 This is a schematic diagram of the structure of the first buffer component in the embodiments of this application;

[0052] Figure 6 This is a schematic diagram of the universal joint assembly in the embodiments of this application;

[0053] Figure 7 This is a schematic diagram of the structure of the sliding component in an embodiment of this application;

[0054] Figure 8 This is a schematic diagram of the structure of the second buffer component in the embodiments of this application.

[0055] Explanation of reference numerals in the attached drawings: 1. Volute; 101. Side air inlet; 102. End air outlet; 11. Mounting bracket; 12. Fan blade; 13. Dual-sided external rotor motor; 14. Protective net; 2. Flanged edge; 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 element; 5. Universal hinge assembly; 51. Universal ball; 52. Ball seat; 6. Sliding assembly; 61. Guide rail; 62. Slider; 63. Stop; 64. Second elastic element; 7. Second buffer assembly; 71. Wedge block; 711. Wedge surface; 72. Third elastic element; 73. Telescopic rod. Detailed Implementation

[0056] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail. For ease of description, this application introduces directional terms such as first direction and second direction, as shown in the figure, where X represents the first direction X and Y represents the second direction Y.

[0057] This application discloses a single-inlet centrifugal fan. (Refer to...) Figure 1 and Figure 2 The single-inlet centrifugal fan includes a volute 1, a mounting bracket 11, fan blades 12, and a double-sided external rotor motor 13 with two output shafts.

[0058] The volute 1 has a side air inlet 101 and an end air outlet 102. Airflow enters the volute 1 through the side air inlet 101 and is discharged through the end air outlet 102. The mounting bracket 11 is located inside the volute 1 and is fixedly connected to the volute 1. The housing of the dual-side external rotor motor 13 is fixedly connected to the mounting bracket 11. The output shaft of the dual-side external 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 dual-side external rotor motor 13 is started, it drives the fan blade 12 to rotate. During the rotation of the fan blade 12, the airflow is transported from the side air inlet 101 to the end air outlet 102. In order to protect the fan blade 12, a protective net 14 is fixedly connected to the side air inlet 101 of the volute 1. The protective net 14 is located on the side of the fan blade 12 near the outside of the volute 1.

[0059] Reference Figure 3 The volute 1 has a flange 2 formed outward at the end exhaust port 102, and the outer periphery of the flange 2 is circular;

[0060] Reference Figure 4 and Figure 5The centrifugal fan also includes a connecting ring 3, the central axis of which is parallel to a first direction. A mounting groove 31 is coaxially formed on the inner circumferential wall of the connecting ring 3. A flange 2 is located inside the connecting ring 3, and its outer circumference is inserted into the mounting groove 31. In the first direction, the thickness of the mounting groove 31 is greater than the thickness of the flange 2 in the first direction, allowing the flange 2 to sway along the first direction within the mounting groove 31. Furthermore, a virtual plane perpendicular to the first direction is designated as a reference plane. On this reference plane, the diameter of the inner circumferential wall of the mounting groove 31 is greater than the outer diameter of the flange 2, allowing the flange 2 to sway along the reference plane within the mounting groove 31. To reduce the impact force generated by the swaying, a buffer device is provided between the flange 2 and the connecting ring 3. In some embodiments of this application, multiple buffer devices are provided between the flange 2 and the connecting ring 3, and these buffer devices are spaced apart around the circumference of the connecting ring 3. In this disclosure, the multiple buffer devices are evenly distributed along the circumference of the connecting ring 3.

[0061] Reference Figure 5 and Figure 6 The buffer device includes a first buffer assembly 4, which includes a first protrusion 41, a second protrusion 42, and a first elastic member 43.

[0062] 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 distributed at intervals. 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 this disclosure, the first elastic member 43 is a compression spring. In the circumferential direction of the connecting ring 3, when the distance between the first protrusion 41 and the second protrusion 42 decreases, the deformation of the first elastic member 43 increases, storing a force that drives the first protrusion 41 and the second protrusion 42 to move toward the side that is far 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.

[0063] In some embodiments of this application, each buffer device has one second protrusion 42, two first protrusions 41, and multiple first elastic elements 43. In the circumferential direction of the connecting ring 3, the second protrusion 42 is located between two first protrusions 41. Each first protrusion 41 and the second protrusion 42 are connected by at least one first elastic element 43, so that both ends of the second protrusion 42 in the circumferential direction of the connecting ring 3 can be buffered.

[0064] In some embodiments of this application, each of the first elastic members 43 is provided with a universal hinge assembly 5 at both ends. 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 adapted to be 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.

[0065] Reference Figure 6 and Figure 7 In some embodiments of the application, the first elastic member 43 is movable along the first direction on the second protrusion 42. In order to realize the movement of the first elastic member 43, a sliding component 6 is provided between the first elastic member 43 and the second protrusion 42. The sliding component 6 includes a guide rail 61, a slider 62, two stops 63 and two second elastic members 64. The guide rail 61 is fixedly connected to the second protrusion 42 and is parallel to the first direction. The slider 62 is adapted to be installed on the guide rail 61 and is movable along the first direction on the guide rail 61. The ball seat 52 connected to the second protrusion 42 is fixedly connected to the slider 62 so as to slide along the first direction with the slider 62. Each end of the guide rail 61 is provided with a stop 63, which is fixedly connected to the second protrusion 42. In the first direction, the slider 62 is located between the two stops 63. Each stop 63 and the slider 62 are respectively connected to a second elastic element 64. One end of the second elastic element 64 is fixedly connected to the slider 62, and the other end is fixedly connected to the stop 63. In this disclosure, the second elastic element 64 is a compression spring. The extension and retraction direction of the second elastic element 64 is parallel to the first direction. The second elastic element 64 stores preload, that is, the second elastic element 64 is in a compressed state, so as to provide deformation gap for the extension and retraction of the second elastic element 64 along the first direction.

[0066] 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 provide cushioning, in some embodiments of this application, the cushioning device further includes a second cushioning component 7. The second cushioning 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 is slidably connected to the flange along the second direction. 2. On 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. In the second direction, the second protrusion 42 is located between the two wedge blocks 71. The wall surface of the two wedge blocks 71 that is close to each other is the wedge surface 711. 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 towards the side that is close to each other; the end of the second protrusion 42 that is close to the outer peripheral wall of the flange 2 is in contact with the wedge surface 711.

[0067] The third elastic element 72 is a compression spring. One end of the third elastic element 72 is fixedly connected to the wedge block 71, and the other end is fixedly connected to the first protrusion 41. The extension and retraction direction of the third elastic element 72 is parallel to the second direction, and the third elastic element 72 stores pre-pressure to provide deformation gap for the extension and retraction of the third elastic element 72 along the second direction, so that the wedge block 71 can slide in the second direction.

[0068] In order to guide the movement of the wedge block 71, in some embodiments of this application, each of the two wedge blocks 71 is provided with a telescopic rod 73 at the ends that are far apart 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. The telescopic direction of the telescopic rod 73 is parallel to the second direction.

[0069] The implementation principle of a single-inlet centrifugal fan in this application embodiment is as follows: the connecting ring 3 is fixedly installed on the air duct with screws, and the double-sided external rotor motor 13 drives the fan blades 12 to rotate, so that the airflow is delivered from the side air inlet 101 to the end air outlet 102 and discharged.

[0070] During the airflow process, the volute 1 is subjected to a large wind force due to the airflow. During this process, the first elastic element 43, the second elastic element 64, and the third elastic element 72 can buffer the wind force in all directions, so that the volute 1 forms a structure that, although it sways under the wind, has multi-directional shock absorption. This reduces the possibility of the volute 1 breaking at the connection point due to excessive impact force from the wind, and also reduces the possibility of the screws at the connection between the connecting ring 3 and the air duct breaking.

[0071] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this 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) has a flange (2) formed around the outer periphery of the end air outlet (102); A connecting ring (3) has a mounting ring groove (31) coaxially formed on its inner circumferential wall; the outer circumference of the flange (2) is circular and extends into the mounting ring groove (31), and the inner diameter of the inner circumferential wall of the mounting ring groove (31) is larger than the outer diameter of the flange (2); as well as A buffer device, the buffer device including a first buffer component (4), the first buffer component (4) including: The first protrusion (41) is fixedly connected to the outer peripheral wall of the flange (2); The second protrusion (42) is fixedly connected to the inner wall of the mounting annular groove (31); and The first elastic element (43) is connected between the first protrusion (41) and the second protrusion (42). When the first elastic element (43) is in a recoverable deformation state, it stores a force that pushes the first protrusion (41) and the second protrusion (42) to move to increase the distance between the first protrusion (41) and the second protrusion (42). It also includes a universal joint assembly (5), with one universal joint assembly (5) connected to each end of the first elastic member (43), and the universal joint assembly (5) includes: A universal ball (51), said universal ball (51) being fixedly connected to the end of the first elastic member (43); and Ball seat (52), the universal ball (51) is adapted to the universal rotatable connection of 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); In the first direction, the thickness of the flange (2) is less than the length of the mounting annular groove (31) in the first direction; It also includes a sliding component (6), with each of the first elastic element (43) and the second protrusion (42) respectively connected by the sliding component (6), the sliding component (6) comprising: A slider (62) is slidably connected to the second protrusion (42) along a first direction. At one end where the first elastic member (43) is indirectly connected to the second protrusion (42), a ball seat (52) is fixedly connected to the slider (62); and The second elastic element (64) has a telescopic direction parallel to the first direction. One end of the second elastic element (64) is fixedly connected to the slider (62), and the other end is fixedly connected to the second protrusion (42). 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 includes a second buffer assembly (7), which includes two wedge-shaped blocks (71) distributed along a second direction. The wedge-shaped blocks (71) are located at the second gap (421). The side of the two wedge-shaped blocks (71) that is close to each other is a wedge-shaped surface (711). The two wedge-shaped surfaces (711) are inclined towards the central axis of the connecting ring (3) in the direction of approach. The second protrusion (42) contacts the edge of the wedge-shaped surface (711) near the edge of the wedge-shaped surface (711). The third elastic element (72) is fixedly connected at one end to the wedge block (71) and at the other end to the first protrusion (41). The extension and retraction direction of the third elastic element (72) is parallel to the second direction.

2. A single-inlet centrifugal fan according to claim 1, characterized in that, The buffer devices are distributed in multiple ways around the circumference of the connecting ring (3).

3. A single-inlet centrifugal fan according to claim 2, characterized in that, The first buffer assembly (4) includes 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) through the first elastic member (43).

4. A single-inlet centrifugal fan according to claim 2, characterized in that, A telescopic rod (73) is connected between the wedge block (71) and the first protrusion (41), and the telescopic rod (73) extends in a direction parallel to the second direction.

5. A single-inlet centrifugal fan according to any one of claims 1-4, characterized in that, Also includes: A dual-side external rotor motor (13) is fixedly connected to the volute (1); as well as The fan blade (12) is located at the side air inlet (101) and is connected to the output shaft of the double-sided external rotor motor (13).

6. A single-inlet centrifugal fan according to claim 5, characterized in that, It also includes a protective net (14) fixedly connected to the volute (1), the protective net (14) being located at the side air inlet (101) and on the side of the fan blade (12) near the outside of the volute (1).

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