Series fan module

Abstract

The utility model relates to the field of fan assembly connecting structures, in particular to a series fan module which comprises a first fan frame, a second fan frame, a first impeller assembly and a second impeller assembly. The buckling structure comprises a guide groove and a guide protrusion which are arranged on the first fan frame, and an axial limiting protrusion and a radial limiting protrusion which are arranged on the second fan frame, and the guide protrusion is sequentially provided with a first arc-shaped transition part protruding outwards and a second arc-shaped transition part recessed inwards in the direction from the inlet of the guide groove to the root of the guide groove. The radian of the second arc-shaped transition part is greater than that of the first arc-shaped transition part; the axial limiting protrusion can slide in the guide groove and abut against the groove wall of the guide groove, and the radial limiting protrusion can slide in the first arc-shaped transition part in an interference mode and is clamped in the second arc-shaped transition part. The fan frame can be quickly assembled, the connection stability of the fan frame is enhanced, the structural strength of the series fan module is improved, and the problems of deformation and breakage of the fan frame are avoided.

Description

Technical Field

[0001] This application relates to the field of fan assembly connection structures, and in particular to a series fan module. Background Technology

[0002] With the rapid development of communication technology, the performance of communication servers has continuously achieved breakthrough improvements. Today, the data processing capabilities and computing speeds of communication servers have increased significantly, and their application scenarios are becoming increasingly widespread, such as large-scale data centers and cloud computing services. Therefore, the requirements for heat dissipation equipment for communication servers are also becoming increasingly stringent. As an indispensable heat dissipation device in the field of communication servers, the series fan module plays an increasingly crucial role. By enhancing airflow, it can quickly remove the heat generated by the server, keeping the server within a suitable operating temperature range, which is of paramount importance for ensuring the reliability and stability of the communication system. Existing series fan modules typically consist of two fan frames connected together. The impellers in the two fan frames rotate in opposite directions, and the impeller blades bend in opposite directions. Because the drive mechanisms of the impellers in the two fan frames are independent, the impeller in one fan frame is responsible for blowing air, and the impeller in the other fan frame is responsible for drawing air. At a specific speed ratio, a certain degree of de-spinning and continuous operation can be formed. The fan also has the ability to output different airflow fields, achieving better ventilation and heat dissipation effects. There are two common methods for connecting the two fan frames. One method involves tightening screws, requiring tools like screwdrivers to secure each screw individually, ensuring a firm connection between the fan frames. The other method uses clips, leveraging their elasticity and specific structural features to hold the two fan frames together. Both methods, to a certain extent, meet the basic requirements for fan frame connection, ensuring the assembly and use of the counter-rotating fan. However, existing methods of connecting two fan frames using screws or clips have significant drawbacks. Tightening screws is complex, time-consuming, and requires considerable effort. Furthermore, after repeated disassembly and assembly, the screw holes are prone to wear, making it difficult to tighten the screws and affecting the stability of the connection. While adding a clip structure to the fan frames is simpler, insufficient strength in the clip structure during disassembly and assembly can lead to deformation or even breakage. Damage to the clips can damage the fan frames, consequently affecting the overall performance and lifespan of the counter-rotating fan. Utility Model Content

[0003] To enable rapid assembly of the fan frame, enhance the connection stability of the fan frame, improve the structural strength of the series fan module, avoid deformation and breakage of the fan frame, and thus extend the service life of the series fan module, a counter-rotating fan module is provided.

[0004] This application provides a series fan module, including a first fan frame, a second fan frame, and a first impeller assembly and a second impeller assembly respectively disposed within the two fan frames. The first impeller assembly and the second impeller assembly are respectively connected to their respective drive mechanisms. The first fan frame and the second fan frame are detachably connected by at least two sets of symmetrically arranged rotary fastening structures. The fastening structure includes a first rotary fastening member disposed on the first fan frame and a second rotary fastening member disposed on the second fan frame. The first rotary fastening part and the second rotary fastening part are fastened by rotation. The first rotary fastening member includes a guide groove and a guide protrusion disposed on the outer surface of the first fan frame. The guide protrusion is provided with an outwardly convex first arc-shaped transition part and an inwardly concave second arc-shaped transition part in sequence along the direction from the inlet of the guide groove to the root. The arc of the second arc-shaped transition part is greater than the arc of the first arc-shaped transition part. The second rotary fastening component includes an axial limiting protrusion and a radial limiting protrusion disposed on the inner surface of the second sector frame. The axial limiting protrusion is slidable in the guide groove and abuts against the groove wall of the guide groove. The radial limiting protrusion is interference-slidable in the first arc-shaped transition portion and engages within the second arc-shaped transition portion. By adopting the above technical solution, the first sector frame and the second sector frame are detachably connected by at least two sets of symmetrically arranged rotary fastening structures. Specifically, the first rotary fastening component has a guide groove and a guide protrusion, and the guide protrusion has a first arc-shaped transition portion and a second arc-shaped transition portion with different curvatures. The second rotary fastening component has an axial limiting protrusion and a radial limiting protrusion. During assembly, the axial limiting protrusion slides within the guide groove and abuts against the groove wall, acting as an axial limiter to restrict axial movement of the two fan frames after connection, thus ensuring a more stable axial connection. The radial limiting protrusion can slide with interference fit within the first arc-shaped transition section and engage with the second arc-shaped transition section. Interference fit refers to the relative sliding phenomenon between the two contact surfaces under interference fit conditions. Furthermore, the curvature of the second arc-shaped transition section is greater than that of the first arc-shaped transition section, allowing the first arc-shaped transition section to easily engage with the second arc-shaped transition section without requiring significant force during assembly. During disassembly, only a certain amount of external force is needed to unscrew the first arc-shaped transition section out of the second arc-shaped transition section, preventing the two fan frames from loosening radially. This rotary locking method, compared to traditional screw or clip methods, requires no additional tools, making operation simpler and more convenient, and enabling rapid assembly of the fan frames. Furthermore, the rotating snap-fit ​​structure is less prone to problems such as screw hole wear or snap-fit ​​breakage, effectively preventing deformation and breakage of the fan frame, thereby improving the structural strength of the tandem fan module and extending its service life. Preferably, the connection between the first arc-shaped transition portion and the second arc-shaped transition portion is an arc-shaped transition surface.By adopting the above technical solution, the connection between the first and second arc-shaped transition portions is an arc-shaped transition surface, making the radial limiting protrusion slide more smoothly from the first to the second arc-shaped transition portion. During the assembly of the first and second fan frames, this smooth transition reduces the friction between the radial limiting protrusion and the guide protrusion, reducing wear and tear, and thus improving the durability of the rotary fastening structure. Simultaneously, the smooth sliding process helps improve assembly efficiency, allowing operators to complete the fan frame assembly work more easily and quickly. Furthermore, the arc-shaped transition surface allows the radial limiting protrusion to accurately engage with the second arc-shaped transition portion, ensuring the accuracy and stability of the rotary fastening structure, further enhancing the stability of the connection between the first and second fan frames, which helps maintain the overall stability of the tandem fan module structure, ensuring its normal operation and extending its service life. Preferably, the guide groove is an "L"-shaped structure, comprising a positioning portion and a limiting portion, with the positioning portion perpendicular to the limiting portion, and the guide protrusion located at the right angle formed by the positioning portion and the limiting portion. By adopting the above technical solution, the guide groove is designed as an "L" shape, including a vertical positioning part and a limiting part, with the guide protrusion located at the right angle formed by the two. During the assembly of the first and second fan frames, the positioning part guides the axial limiting protrusion of the second fan frame smoothly into the guide groove, playing a preliminary positioning role and ensuring the accurate positioning of the two fan frames during initial installation. When the axial limiting protrusion slides along the positioning part to the right angle where the guide protrusion is located, the second fan frame is rotated, causing the axial limiting protrusion to enter the limiting part. Due to the limiting effect of the limiting part, the axial limiting protrusion slides within the limiting part and eventually engages. This "L" shape structure and specific layout make the first and second fan frames more stable and reliable during rotational engagement. Compared with ordinary connection structures, it effectively enhances the connection stability between the fan frames and reduces the possibility of loosening. Simultaneously, this structure prevents the fan frames from misaligning or separating during long-term use or under external force, further improving the structural strength of the tandem fan module and preventing deformation and breakage of the fan frames, thereby extending the service life of the tandem fan module. Furthermore, this "L"-shaped guide groove design facilitates assembly and disassembly operations for operators, eliminating the need for additional tools and enabling rapid assembly and disassembly of the fan frames, thus improving production and maintenance efficiency. Preferably, the positioning part extends to the splicing surface of the first fan frame. By adopting the above technical solution, the positioning part extends to the splicing surface of the first fan frame, allowing the axial limiting protrusion of the second fan frame to directly enter the positioning part from the splicing surface of the first fan frame during installation. In this way, when assembling the first and second fan frames, operators can more clearly see the starting position of the axial limiting protrusion entering the guide groove, reducing alignment difficulty and minimizing time wasted due to misplacement of the entry point during installation, thereby achieving rapid assembly of the fan frames.Meanwhile, precise inlet guidance allows the axial limiting protrusion to slide more smoothly along the guide groove, avoiding jamming or offset caused by unclear inlet. This ensures more accurate matching between the subsequent radial limiting protrusion and the first and second arc-shaped transition parts, further enhancing the stability of the fan frame connection and improving the structural strength of the tandem fan module. Moreover, this precise connection method reduces unnecessary external force compression and friction on the fan frame during connection, preventing deformation and breakage, thereby extending the service life of the tandem fan module. Preferably, a central tube is provided through the middle of both the first and second fan frames, and ball bearings are installed inside both central tubes. When the first and second fan frames are installed, the two central tubes are coaxially opposite each other. By adopting the above technical solution, a central tube is installed through the middle of the first and second fan frames. A ball bearing is installed inside the central tube, and the two central tubes are coaxially aligned during installation for connection to an external drive motor. The output shaft of the external drive motor passes through the central tube and engages with the ball bearing. The ball bearing reduces the frictional resistance during output shaft rotation, allowing the output shaft to smoothly drive the impellers in the central tube and fan frames. Simultaneously, the coaxial alignment of the two central tubes ensures the stability and efficiency of drive transmission, guaranteeing stable and reliable fan operation for ventilation and heat dissipation. Preferably, both the first and second fan frames are equipped with wire clamping structures. By adopting the above technical solution, the wire clamping structures in the first and second fan frames can secure the wires, preventing them from shaking or shifting during fan module operation, reducing malfunctions caused by loose wires, and improving the stability and reliability of the series-connected fan modules. Preferably, the wire clamping structure includes a first engaging member and a second engaging member, with a wire clamping through hole formed between the first engaging member and the second engaging member. The first engaging member is provided with an engaging groove, and a hook portion is provided within the engaging groove. The second engaging member is provided with a hook portion corresponding to the engaging groove, and the hook portion can be inserted into the hook groove and engaged with the hook portion. By adopting the above technical solution, a wire clamping structure including a first engaging member and a second engaging member is provided in the first and second fan frames, which can effectively fix the wire. The first engaging member and the second engaging member form a wire clamping through hole for the wire to pass through. The hook portion is provided within the engaging groove of the first engaging member, and the hook portion is provided correspondingly in the second engaging member. The hook portion is inserted into the hook groove and engaged with the hook portion, which can ensure a stable connection of the wire clamping structure, prevent the wire from loosening or detaching, and improve the reliability and stability of the wire fixing. Preferably, both the first and second fan frames are composed of cylindrical and rectangular structures, and the cylindrical structure of the first fan frame is closely fitted with the cylindrical structure of the second fan frame; both the first and second fan frames have symmetrically arranged planes, and the guide groove entrance of the second fan frame is connected to its corresponding plane. When the first and second fan frames are rotated and engaged, their planes correspond one-to-one.By adopting the above technical solution, both the first and second sector frames are composed of cylindrical and rectangular structures. This combined structure fully utilizes the cylindrical structure to facilitate the rotation and interlocking connection of the two sector frames. On the other hand, the rectangular structure facilitates the installation and fixation of the sector frames, allowing them to better adapt to the installation space of equipment such as communication servers. The tight fit between the cylindrical structures of the first and second sector frames prevents air leakage from the connection gaps, further improving airflow efficiency. Both the first and second sector frames have symmetrically arranged planes, and the guide groove inlet of the second sector frame connects to the corresponding plane. During assembly, workers can quickly determine the relative position and angle of the first and second sector frames based on these planes, making the splicing of the first and second sector frames more precise. Simultaneously, the flatness of the planes facilitates operation and alignment, effectively reducing assembly errors and the number of adjustments compared to situations without plane-assisted positioning, thereby improving assembly efficiency. When the first and second fan frames are rotated and engaged, their planes correspond one-to-one. This correspondence ensures that the two fan frames are evenly stressed in the circumferential direction, avoiding local stress concentration, enhancing the stability of the fan frame connection, reducing the possibility of deformation or damage due to uneven stress, improving the overall structural strength of the tandem fan module, and also helping to extend the service life of the tandem fan module. Furthermore, the planar design can increase the friction on the outer surface of the fan frames to a certain extent, making it easier for workers to hold and operate, further improving the convenience of the assembly process. Preferably, the number of the rotating engagement structures is four, and the four sets of rotating engagement structures are evenly distributed. By adopting the above technical solution, setting the rotating engagement structures to four sets and evenly distributed, the first and second fan frames can be engaged at multiple even points. Compared to a smaller number of engagement structures, more sets of engagement structures can disperse the stress generated during connection, avoiding local stress concentration that could lead to fan frame deformation or unstable connection. The evenly distributed design further ensures that the force at each engagement point is balanced, making the connection between the two fan frames in the circumferential direction more stable and reliable. This layout enhances the structural strength of the entire tandem fan module, reducing the possibility of fan frame loosening or separation due to vibration or external impact. It effectively prevents fan frame deformation and breakage, significantly extending the service life of the tandem fan module. It also facilitates rapid assembly of the fan frames, allowing for easier and quicker engagement of the two frames during assembly. Preferably, the second fan frame has an opening corresponding to the axial limiting protrusion, and the length of the opening is greater than the length of the axial limiting protrusion. By adopting the above technical solution, with the second fan frame having an opening corresponding to the axial limiting protrusion and the opening length greater than the axial limiting protrusion, the axial limiting protrusion can slide smoothly within the guide groove when the first and second fan frames are rotated and engaged. Because the opening provides sufficient space, it avoids interference between the axial limiting protrusion and surrounding structures that could hinder sliding.Meanwhile, the opening facilitates airflow through the gap between the two fan frames, preventing the problem of insufficient air pressure in the gap making it difficult to turn. Furthermore, the design, with the opening length exceeding the length of the axial limiting protrusion, allows for easy observation of whether the limiting protrusion is abutting against the guide groove wall. During long-term use, this structure helps reduce the risk of damage caused by component friction, enhances the durability of the rotary locking structure, and thus improves the structural stability and service life of the entire tandem fan module.

[0005] In summary, this application includes at least one of the following beneficial technical effects:

[0006] 1. Since the first frame and the second frame are connected by at least two sets of symmetrically arranged rotating fastening structures, and the first and second rotating fastening parts can be fastened by rotating, this method does not require tools to tighten them one by one like screws, nor does it require repeated clamping like a snap-on type, so it can achieve rapid assembly of the frame.

[0007] 2. The rotating fastening structure relies on the cooperation of components such as guide grooves, guide protrusions, axial limiting protrusions, and radial limiting protrusions to achieve a stable fastening, which is not affected by screw hole wear or buckle damage. Therefore, the fan frame connection is stable and the connection stability of the fan frame is enhanced.

[0008] 3. The second arc-shaped transition section of the guide protrusion has a larger arc than the first arc-shaped transition section, which can easily achieve quick assembly and disassembly;

[0009] 4. The wire clamp structure can effectively tighten the electrical circuit, preventing the wires from shaking or shifting during the operation of the fan module, reducing faults caused by loose wires, and improving the stability and reliability of the series fan module. Attached Figure Description

[0010] Figure 1 This is an exploded view of a series fan module according to this application;

[0011] Figure 2 This is a schematic diagram of the structure of a series fan module according to this application;

[0012] Figure 3 This is a schematic diagram of the first fan frame structure of a series fan module according to this application;

[0013] Figure 4 This is a schematic diagram of the second fan frame structure of a series fan module according to this application;

[0014] Figure 5 This is a schematic diagram of the wire clamp structure of a series fan module according to this application.

[0015] Explanation of reference numerals in the attached drawings: 1. First sector frame; 2. Second sector frame; 3. First impeller assembly; 4. Second impeller assembly; 5. Rotary fastening structure; 6. Wire clamping structure; 11. Middle tube; 12. Ball bearing; 13. Plane; 22. Opening; 51. First rotary fastening component; 52. Second rotary fastening component; 61. First locking component; 62. Second locking component; 63. Wire clamping through hole; 511. Guide groove; 512. Guide protrusion; 521. Axial limiting protrusion; 522. Radial limiting protrusion; 511a. Positioning part; 511b. Limiting part; 512a. First arc-shaped transition part; 512b. Second arc-shaped transition part; 611. Locking groove; 612. Hook part; 621. Hook part. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0017] This application provides a series fan module, referring to... Figure 1 and Figure 2 The assembly includes a first fan frame 1, a second fan frame 2, a first impeller assembly 3, and a second impeller assembly 4. The first fan frame 1 and the second fan frame 2 are detachably connected by a rotating fastening structure 5. Both the first fan frame 1 and the second fan frame 2 are provided with wire clamping structures 6 for threading wires. The first impeller assembly 3 and the second impeller assembly 4 are respectively disposed within the second fan frame 2 of the first fan frame 1. In this embodiment, the first impeller assembly 3 and the second impeller assembly 4 can be independently controlled in terms of rotation speed. The two impellers have the same number of blades but opposite bending directions, and their rotation directions are also opposite. One of the first fan frame 1 and the second fan frame 2 blows air, while the other draws air in. This structure allows the first fan frame 1 and the second fan frame 2 to be easily connected and disassembled, achieving the effect of easy assembly and maintenance. Compared with existing screw and snap-fit ​​connections, the rotating fastening structure 5 is simpler and faster to operate.

[0018] Reference Figure 1Specifically, in this embodiment, both the first fan frame 1 and the second fan frame 2 are composed of cylindrical and rectangular structures, respectively. Both the first fan frame 1 and the second fan frame 2 have a central tube 11 and a ball bearing 12 positioned at their central axis. In this embodiment, the central tube 11 is a copper central tube 11. The ball bearing 12 includes an outer ring, an inner ring, a cage, and balls located between the outer and inner rings. After assembling the two fan frames, the copper central tubes 11 of the first fan frame 1 and the second fan frame 2 are in contact and coaxial. When the series fan module is installed on the communication server, the motor shaft of the external drive motor is tightly connected to the inner ring of the bearing through an interference fit, ensuring reliable torque transmission. The copper central tube 11 serves as a fixed support structure, and its inner wall is fitted with the outer ring of the bearing to ensure concentricity and prevent radial movement. In this structure, when the motor shaft rotates, it drives the inner ring of the bearing to rotate synchronously, while the outer ring remains stationary because it is fixed to the copper central tube 11, thus driving the impeller. In particular, in this embodiment, the rectangular structures of the first sector frame 1 and the second sector frame 2 are opposite and parallel, and each of the four corners of the rectangular structures of the first sector frame 1 and the second sector frame 2 is provided with a mounting hole for mounting the sector frame on the communication server.

[0019] Reference Figure 1 Furthermore, in this embodiment, the outer walls of the cylindrical structures of the first sector 1 and the second sector 2 are each cut with four planes 13. These four planes 13 are symmetrically and evenly distributed on the outer walls of the cylindrical structures, and each of the four planes 13 of the first sector 1 and the second sector 2 is parallel to the four sides of their respective rectangular structures. (Refer to...) Figure 1 Specifically, this embodiment has four sets of rotating fastening structures 5, which are evenly distributed. Each set of rotating fastening structures 5 includes a first rotating fastening member 51 and a second rotating fastening member 52. The first rotating fastening member 51 is disposed on the outer surface of the cylindrical structure of the first fan frame 1, and the second rotating fastening member 52 is disposed on the inner surface of the cylindrical structure of the second fan frame 2. In particular, the joint surface of the cylindrical structure of the second fan frame 2 extends with four arc-shaped protrusions, which are evenly distributed on the outer wall of the cylindrical structure. The inner wall of the arc-shaped protrusions is provided with the second rotating fastening member 52. The distance between any two arc-shaped protrusions is greater than the outer diameter of the cylindrical structure of the first fan frame 1, so that the second rotating fastening member 52 can rotate and engage with the first rotating fastening member 51 to achieve a locking action. This fastening method cleverly utilizes the rotational action, which can complete the connection of the fan frames in a shorter time and improve assembly efficiency. (Refer to...) Figure 3Specifically, the first rotating fastener 51 includes a guide groove 511 and a guide protrusion 512 integrally formed on the outer surface of the first sector frame 1. The guide groove 511 guides the movement of the second rotating fastener 52, while the guide protrusion 512 is used to cooperate with the second rotating fastener 52 to achieve fastening. The guide protrusion 512 has a first arc-shaped transition portion 512a and a second arc-shaped transition portion 512b arranged sequentially from the entrance of the guide groove 511 to the root. The first arc-shaped transition portion 512a protrudes outward, and the second arc-shaped transition portion 512b is recessed inward, forming an "S"-shaped structure. The curvature of the concave arc of the second arc-shaped transition portion 512b is greater than the curvature of the convex arc of the first arc-shaped transition portion 512a. Furthermore, the arc length of the convex arc of the first arc transition portion 512a is greater than the arc length of the concave arc of the second arc transition portion 512b, and the arc length of the concave arc of the second arc transition portion 512b is 1 / 4 to 1 / 10 of the arc length of the convex arc of the first arc transition portion 512a. In this embodiment, the guide groove 511 is L-shaped. The L-shaped guide groove 511 includes a positioning portion 511a and a limiting portion 511b. The positioning portion 511a is perpendicular to the limiting portion 511b, and the guide protrusion 512 is located at the right angle formed by the positioning portion 511a and the limiting portion 511b. The positioning portion 511a extends to the splicing surface of the first sector frame 1. In addition to the L-shaped shape of this embodiment, the guide groove 511 can also be T-shaped or other shapes, as long as it can achieve the function of guiding and positioning. The guide protrusion 512 is generally made of a metal material, such as aluminum alloy, which has good strength and wear resistance. It is worth mentioning that the design of the first arc-shaped transition portion 512a and the second arc-shaped transition portion 512b enables a smooth transition and reliable engagement during the fastening process. Furthermore, the connection between the first arc-shaped transition portion 512a and the second arc-shaped transition portion 512b is an arc-shaped transition surface, the arc length of which is 1 / 5 to 1 / 10 of the arc length of the concave arc of the second arc-shaped transition portion 512b. This design reduces resistance during fastening, making the fastening process smoother.

[0020] In this design, the guide groove 511 of the second sector frame 2 connects to its corresponding plane 13. When the first sector frame 1 and the second sector frame 2 are rotated and engaged, their planes 13 correspond one-to-one. This design allows for more accurate positioning during assembly, improving assembly precision and efficiency. (Refer to...) Figure 4Specifically, the second rotary fastener 52 includes an axial limiting protrusion 521 and a radial limiting protrusion 522. The axial limiting protrusion 521 is slidable in the guide groove 511 and abuts against the groove wall of the guide groove 511, thus limiting the movement of the second sector frame 2 in the axial direction. The radial limiting protrusion 522 is interference-slidable in the first arc-shaped transition portion 512a and engages with the second arc-shaped transition portion 512b, realizing a reliable radial connection between the first sector frame 1 and the second sector frame 2. Interference sliding refers to the phenomenon of relative sliding between the two contact surfaces under interference fit, which makes it easier to loosely engage the first arc-shaped transition portion 512a into the second arc-shaped transition portion 512b without applying a large force during assembly.

[0021] In this embodiment, the width of the axial limiting protrusion 521 is greater than the width of the radial limiting protrusion 522 to ensure that when the axial limiting protrusion 521 abuts against the wall of the guide groove 511, the radial limiting protrusion 522 can engage with the second arc-shaped transition portion 512b. In this embodiment, the axial limiting protrusion 521 and the second sector frame 2 are integrally formed, which not only enhances the structural strength but also allows for better contact with the wall of the guide groove 511. In addition, the surface of the radial limiting protrusion 522 is a convex arc surface, and the curvature is consistent with the curvature of the second arc-shaped transition portion 512b, thus ensuring a tight fit between the two during engagement.

[0022] Reference Figure 4 Furthermore, the second fan frame 2 is provided with an opening 22 at the position corresponding to the axial limiting protrusion 521, and the length of the opening 22 is greater than the length of the axial limiting protrusion 521. The setting of this opening 22 is conducive to observing whether the axial limiting protrusion 521 is engaged in place during the fastening process, and also facilitates the disassembly of the two fan frames.

[0023] Reference Figure 5Specifically, in this embodiment, the first fan frame 1 and the second fan frame 2 are both provided with a wire clamping structure 6 at their contacting ends. After the two fan frames are assembled, the wire clamping structures 6 of the two fan frames are located on the same side and are arranged opposite each other. The wire clamping structure 6 includes a first engaging member 61 and a second engaging member 62 that can be inserted into the first engaging member 61. The end face of the first engaging member 61 near the contact surface is provided with an engaging groove 611. A hook part 612 is provided in the engaging groove 611. The second engaging member 62 is provided with a hook part 621. The hook part 621 can be inserted into the hook groove 611 and closely cooperate with the hook part 612 in the hook groove 611 to achieve engagement. When the hook part 621 is inserted into the hook groove 611, a wire clamping through hole 63 is formed between the first engaging member 61 and the second engaging member 62, which can be used to pass wires through, ensuring that after the wire is installed inside the fan frame, the wire can be led out from the wire clamping through hole 63. Of particular note is that the width of the wire clamping hole 63 in this embodiment is designed to be within a reasonable range to clamp the wire, preventing the wire from shaking and affecting the impeller operation. The implementation principle of this embodiment is as follows: the first sector frame 1 and the second sector frame 2 are quickly assembled and disassembled through four sets of evenly distributed rotary fastening structures 5. The wire clamping structure 6 leads out the internal wire and clamps it. The symmetrical plane 13 cut on the outer wall and the mounting holes at the four corners of the rectangular structure ensure both connection stability and easy positioning and installation. The module is equipped with first and second impeller assemblies 4 that can be independently speed controlled. The two impellers have the same number of blades but opposite bending directions and opposite rotation directions, forming a counter-current airflow coupling structure. The rotary fastening mechanism is composed of an "L"-shaped guide groove 511 and a double arc transition part. The guide protrusion 512 is combined with the axial / radial dual limiting structure. The axial limiting protrusion 521 on the inner wall of the second sector frame 2 slides along the guide groove 511 to achieve axial positioning. The radial limiting protrusion 522 forms an interference sliding fit with the guide protrusion 512 through a specially designed "S"-shaped transition structure (including a first transition part with a longer convex arc and a second transition part with a larger concave arc). This ensures the reliability of radial engagement and reduces assembly resistance by using the arc transition surface. The entire connection process combines ease of operation and structural stability, making it particularly suitable for communication server heat dissipation scenarios that require high-frequency maintenance.

[0024] 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 series fan module, comprising a first fan frame (1), a second fan frame (2), and a first impeller assembly (3) and a second impeller assembly (4) respectively disposed within the two fan frames, wherein the first impeller assembly (3) and the second impeller assembly (4) are connectable to their respective drive mechanisms on a printing press, characterized in that, The first sector frame (1) and the second sector frame (2) are detachably connected by at least two sets of symmetrically arranged rotating fastening structures (5). The fastening structure includes a first rotating fastening member (51) disposed on the first sector frame (1) and a second rotating fastening member (52) disposed on the second sector frame (2). The first rotating fastening part and the second rotating fastening part are fastened by rotation. The first rotating fastener (51) includes a guide groove (511) and a guide protrusion (512) provided on the outer surface of the first fan frame (1). The guide protrusion (512) is provided with an outwardly protruding first arc-shaped transition portion (512a) and an inwardly concave second arc-shaped transition portion (512b) in sequence along the direction from the entrance of the guide groove (511) to the root. The arc of the second arc-shaped transition portion (512b) is greater than the arc of the first arc-shaped transition portion (512a). The second rotating fastener (52) includes an axial limiting protrusion (521) and a radial limiting protrusion (522) provided on the inner surface of the second sector frame (2). The axial limiting protrusion (521) can slide on the guide groove (511) and abut against the groove wall of the guide groove (511). The radial limiting protrusion (522) can slide with interference fit on the first arc-shaped transition portion (512a) and engage with the second arc-shaped transition portion (512b).

2. The series fan module according to claim 1, characterized in that, The connection between the first arc-shaped transition portion (512a) and the second arc-shaped transition portion (512b) is an arc-shaped transition surface.

3. A series fan module according to claim 1, characterized in that, The guide groove (511) has an "L" shaped structure. The guide groove (511) includes a positioning part (511a) and a limiting part (511b). The positioning part (511a) is perpendicular to the limiting part (511b). The guide protrusion (512) is located at the right angle formed by the positioning part (511a) and the limiting part (511b).

4. A series fan module according to claim 3, characterized in that, The positioning part (511a) extends to the splicing surface of the first sector frame (1).

5. A series fan module according to claim 1, characterized in that, A central tube (11) is provided through the middle of the first sector frame (1) and the middle of the second sector frame (2). A ball bearing (12) is provided inside the two central tubes (11). When the first sector frame (1) and the second sector frame (2) are installed, the two central tubes (11) are arranged coaxially opposite each other.

6. A series fan module according to claim 1, characterized in that, Both the first sector frame (1) and the second sector frame (2) are provided with a wire clamping structure (6).

7. A series fan module according to claim 1, characterized in that, The wire clamping structure (6) includes a first engaging member (61) and a second engaging member (62). A wire clamping through hole (63) is formed between the first engaging member (61) and the second engaging member (62). The first engaging member (61) is provided with an engaging groove (611). A hook part (612) is provided in the engaging groove (611). The second engaging member (62) is provided with a hook part (621) corresponding to the engaging groove (611). The hook part (621) can be inserted into the hook groove (611) and engage with the hook part (612).

8. A series fan module according to claim 1, characterized in that, Both the first sector frame (1) and the second sector frame (2) are composed of cylindrical and rectangular structures, and the cylindrical structure of the first sector frame (1) is closely fitted with the cylindrical structure of the second sector frame (2); the cylindrical structures of the first sector frame (1) and the second sector frame (2) are symmetrically provided with planes (12), and the entrance of the guide groove (511) of the second sector frame (2) is connected to its corresponding plane (12). When the first sector frame (1) and the second sector frame (2) are rotated and engaged, their planes (12) correspond one-to-one.

9. A series fan module according to claim 1, characterized in that, The number of the rotating fastening structures (5) is four sets, and the four sets of rotating fastening structures (5) are evenly distributed.

10. A series fan module according to claim 1, characterized in that, The second sector frame (2) has an opening (22) at the position corresponding to the axial limiting protrusion (521), and the length of the opening (22) is greater than the length of the axial limiting protrusion (521).

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