Unpowered exhaust hood

Abstract

The invention provides an unpowered exhaust hood. The unpowered exhaust hood comprises a base; the supporting assembly is mounted on the base; the air exhaust cap assembly is mounted on the supporting assembly and can rotate relative to the base, and the air exhaust cap assembly comprises a cap body and an air cap supporting mechanism mounted in the cap body; the exhaust hood assembly further comprises a fan mechanism which is installed on the hood supporting mechanism and rotates along with the hood body or the hood supporting mechanism. According to the unpowered exhaust hood, the fan mechanism rotating along with the hood body or the hood supporting mechanism is additionally arranged on the hood supporting mechanism, so that the exhaust efficiency of the unpowered exhaust hood can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of unpowered fan exhaust, and in particular relates to an unpowered exhaust hood. Background Art

[0002] The unpowered hood (also known as a spherical ventilator or a cyclone ventilator) is a device that uses the natural wind speed to drive the turbine of the fan to rotate and the principle of indoor and outdoor air convection to accelerate and transform any parallel air flow into a vertical air flow from bottom to top to improve the indoor ventilation effect. It does not require electricity, is noiseless, can operate for a long time, and removes indoor heat, moisture and foul air. It is rationally set on the top of the roof according to the natural laws of air and the principle of air flow, and can quickly discharge indoor heat and foul gas to improve the indoor environment.

[0003] The Chinese utility model patent with application number 202310503885.6 discloses a non-powered hood for an exhaust channel with a good air extraction effect, including a connecting ring, a support frame, a connecting glass cylinder, a gasket, a combination sleeve, a protrusion and a matching kit. The upper end of the connecting ring is fixedly connected to the hood body, the appearance of the support frame is in the shape of a "cross", the support frame is fixedly connected to the inside of the connecting ring, the upper end of the connecting glass cylinder is fixedly connected to the lower end of the connecting ring, the gasket is fixedly connected to the lower end of the connecting glass cylinder, the combination sleeve is fixedly connected to the lower surface of the gasket, the edge of the combination sleeve is in the shape of a circular tube, the upper end of the combination sleeve extends inwardly, and the protrusion is fixedly connected to the lower surface of the end of the inwardly extending part of the combination sleeve. In this application, the hood body is roughly spherical in structure, with large wind resistance; and the top of the hood is usually designed to be convex, which needs to occupy the volume inside the hood.

[0004] The Chinese utility model patent with application number 202322783557.4 discloses a non-powered fan exhaust device, including a fixed platform, a rotating ring is rotatably mounted inside the fixed platform through a bearing, and a hood is welded on the top of the rotating ring, a rotating rod is fixedly connected to the inner wall of the top of the hood, and a mounting plate frame is rotatably mounted on the outer wall of the rotating rod through a bearing, and a main gear is fixedly connected to the bottom end of the rotating rod, and a connecting gear is meshed on one side of the main gear. However, this application relies on the meshing of the main gear and the connecting gear for power transmission, which has a large friction force and will affect the exhaust efficiency of the non-powered fan exhaust device. Summary of the invention

[0005] In order to solve the above problems, an object of the present invention is to provide a non-powered exhaust hood to reduce wind resistance and improve exhaust efficiency.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a non-powered exhaust hood, which comprises:

[0007] Pedestal;

[0008] A support assembly, the support assembly being mounted on the base;

[0009] An exhaust hood assembly, the exhaust hood assembly is mounted on the support assembly and can rotate relative to the base, and comprises a hood body and a hood support mechanism mounted in the hood body;

[0010] The hood assembly also includes a fan mechanism which is mounted on the hood support mechanism and rotates along with the hood body or the hood support mechanism.

[0011] Optimally, the base includes a supporting sleeve and a fixing ring formed at the bottom of the supporting sleeve and extending outward, and a plurality of mounting holes are formed on the fixing ring.

[0012] Optimally, the support assembly includes a support rod with one end mounted on the surface of the cap body and with an external thread on the other end, a plurality of support members mounted on the inner wall of the support sleeve and arranged at intervals, a lower jacket and an upper jacket sleeved on the support rod and arranged in opposite directions, and two adjusting nuts mounted on the external thread of the support rod and located outside the lower jacket and the upper jacket.

[0013] The inner ends of the plurality of support members are clamped between the upper jacket and the lower jacket.

[0014] Furthermore, a limit seat is installed on the inner surface of the cap body, and one end of the support rod is installed in the limit seat.

[0015] Furthermore, each of the support members includes a supporting cross plate, a first bending piece formed at the end of the supporting cross plate and installed on the inner wall of the supporting sleeve through a first fastener, and a second bending piece formed at the other end of the supporting cross plate through a connecting portion, the connecting portion is arc-shaped and cooperates with the support rod, and the supporting cross plate and the second bending piece are clamped by the upper jacket and the lower jacket.

[0016] Optimally, the cap body includes a top plate disposed above the base, a lower ring plate disposed below the top plate and sleeved on the base, and a plurality of exhaust blades installed between the top plate and the lower ring plate.

[0017] Preferably, the plurality of exhaust blades are rotationally symmetric with the axis of the top plate as the rotational symmetry center.

[0018] Furthermore, each of the exhaust blades includes a blade plate, connecting pieces formed at both ends of the blade plate, and rivets for mounting the connecting pieces on the top plate and / or the lower ring plate;

[0019] Preferably, each of the exhaust blades further includes an inner guide fold formed on the inner side of the blade plate and an outer guide fold formed on the outer side of the blade plate, and the inner guide fold and the outer guide fold are located on both sides of the blade plate.

[0020] Furthermore, the support mechanism includes a turntable unit rotatably mounted on the support rod and a plurality of hood connecting rods with one end mounted on the hood body and the other end mounted on the turntable unit. The fan mechanism is penetrated by the support rod and mounted on the turntable unit.

[0021] Furthermore, the turntable unit includes a clamping plate sleeved on the support rod, a cover plate sleeved on the support rod and mounted on the surface of the clamping plate to be connected with the plurality of hood connecting rods, a first bearing embedded in the cover plate, and a sleeve fixed in the first bearing and mounted on the support rod through a locking member;

[0022] Optimally, a plurality of adapter brackets are installed in the cap body, and one end of the hood connecting rod is connected to the adapter bracket one by one so that the hood connecting rod is higher than the base;

[0023] Optimally, limiting convex strips are formed on both side edges of the hood connecting rod, and the cover plate includes a plate body, a plurality of connecting rod pressure covers formed on the plate body and protruding from the plate body, a clamping groove formed between each connecting rod pressure cover and the plate body and matching with the limiting convex strip, and a first connecting hole opened on each connecting rod pressure cover, and the connecting rod pressure covers correspond one-to-one with the hood connecting rod.

[0024] Furthermore, the fan mechanism includes a fan base mounted on the other surface of the clamping plate and a fan mounted on the fan base, and the support rod passes through the fan base and the fan;

[0025] Optimally, a second bearing matching with the support rod is embedded in the fan base;

[0026] Optimally, the fan base includes a docking plate with a plurality of second connection holes and a mounting seat formed at the center of the docking plate;

[0027] The fan comprises a central column installed in the mounting seat and a plurality of fan blades formed on the peripheral surface of the central column. A through hole matching with the support rod is provided at the center of the central column.

[0028] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the unpowered exhaust hood of the present invention can improve the exhaust efficiency of the unpowered exhaust hood by adding a fan mechanism that rotates with the hood body or the hood supporting mechanism to the hood supporting mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the unpowered exhaust hood of the present invention;

[0030] Figure 2 It is a structural schematic diagram of the non-powered exhaust hood of the present invention from another perspective;

[0031] Figure 3 for Figure 2 A partial enlarged view of

[0032] Figure 4 It is a partial structural schematic diagram of the supporting member in the unpowered exhaust hood of the present invention;

[0033] Figure 5 It is a structural schematic diagram of a cover plate in a non-powered exhaust hood of the present invention;

[0034] Figure 6 It is a structural schematic diagram of the fan mechanism in the unpowered exhaust hood of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with specific examples, but the present invention is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to different requirements of specific use, and the implementation conditions not specified are conventional conditions in the industry.

[0036] like Figure 1 and Figure 2 The non-powered exhaust hood shown mainly includes a matching base 1, an exhaust hood assembly 2, a support assembly 3 and other structures.

[0037] Among them, the base 1 cooperates with the flue and is usually installed on the top of the flue, and the exhaust hood assembly 2 is installed through the support assembly 3. The specific shape and structure of the base 1 are not limited, as long as it can be installed on the flue through fasteners (such as bolts, screws, etc.) and carry the exhaust hood assembly 2. In the present embodiment, the base 1 includes a support sleeve 11 and a fixing ring 12 formed at the bottom of the support sleeve 11 and extending outward (at this time, the fixing ring 12 extends radially outward in the direction of the support sleeve 11); a plurality of mounting holes 121 are provided on the fixing ring 12, so that conventional fasteners (such as bolts, screws, etc.) can be installed in each mounting hole 121 to achieve a fixed connection of the base 1 on the flue (such as Figure 1 shown).

[0038] The support assembly 3 is mounted on the base 1, and is used to mount or support the exhaust cap assembly 2 on the base 1, and to enable the exhaust cap assembly 2 to rotate relative to the base 1. Specifically, Figures 2 to 3 As shown, the support assembly 3 mainly includes a support member 31, a support rod 32, an upper jacket 33, a lower jacket 34 and an adjusting nut 35, etc.

[0039] One end of the support rod 32 is mounted on the inner surface of the cap body and the other end has an external thread (i.e., most of the surface area of ​​the support rod 32 is smooth, but the end thereof facing away from the cap body is provided with an external thread); a limit seat 36 can be installed at the center of the inner surface of the cap body, so that one end of the support rod 32 is installed in the limit seat 36 (the installation method is not limited, and it can be directly inserted into the limit seat 36 and then penetrated and locked with a metal buckle), thereby improving the reliability and stability of the support. There are multiple support members 31 (the specific number of support members 31 can be selected according to actual needs, preferably 3 to 8, and in this embodiment, 4 are arranged at equal intervals), which are installed on the inner wall of the support sleeve 11, arranged at intervals and extending along the radial direction of the support sleeve 11; that is, one end of the support member 31 is installed on the inner wall of the support sleeve 11, and the other end extends in the direction of the support rod 32. The upper jacket 33 and the lower jacket 34 are both sleeved on the support rod 32 and arranged to face each other; there are two adjusting nuts 35, which are installed on the external threads of the support rod 32 and are located on the outside of the lower jacket 34 and the upper jacket 33 (that is, one adjusting nut 35 is located on the lower side of the lower jacket 34, and the other adjusting nut 35 is located on the upper side of the upper jacket 33). In this way, by adjusting the two adjusting nuts 35, the distance between the upper jacket 33 and the lower jacket 34 can be adjusted, and the upper jacket 33 and the lower jacket 34 are used to clamp the inner ends (that is, free ends) of the aforementioned multiple support members 31, so that the inner ends of the multiple support members 31 are clamped between the upper jacket 33 and the lower jacket 34.

[0040] The support member 31 can be a conventional support member such as a conventional support rod, a support plate, etc.; Figure 4As shown, specifically: each support member 31 includes a support cross plate 311 extending radially along the support sleeve 11, a first bending piece 314 formed at the end of the support cross plate 311 and installed on the inner wall of the support sleeve 11 by a first fastener (conventional ones can be, such as screws, rivets, etc., which can be one or more) (the formation here is usually integrated, the same below; the first bending piece 314 is approximately perpendicular to the support cross plate 311, and can also be at other angles, as long as the first bending piece 314 can be fixed to the inner wall of the support sleeve 11 by rivets) and a second bending piece 312 formed at the other end of the support cross plate 311 by a connecting portion 313, and the connecting portion 313 is arc-shaped and cooperates with the support rod 32 (that is, the connecting portion 313 can be against the surface of the support rod 32), so that at least the support cross plate 311 and the second bending piece 312 are clamped by the upper jacket 33 and the lower jacket 34. It should be noted that: the upper jacket 33 and the lower jacket 34 are independently provided with multiple slots (usually four slots); a certain angle is formed between the support cross plate 311 and the second bending piece 312, so that the support cross plate 311 and the second bending piece 312 can be clamped by two adjacent slots, and these two slots can also accommodate the same structure of another support member 31. This is not only conducive to improving the support strength of the support member 31, but also greatly improves the structural stability of the entire support assembly 3 (even when the exhaust cap assembly 2 is rotating or encountering extreme weather, the structural stability between the exhaust cap assembly 2, the support assembly 3 and the base 1 can be guaranteed).

[0041] As mentioned above, the exhaust hood assembly 2 is mounted on the support assembly 3 and can rotate relative to the base 1 (even in the unpowered state, the exhaust hood assembly 2 can rotate relative to the base 1). The exhaust hood assembly 2 includes a hood body and a hood support mechanism 24 mounted in the hood body. The exhaust hood assembly 2 also includes a fan mechanism 25 mounted on the hood support mechanism 24 and rotating with the hood body or the hood support mechanism 24. In this way, not only the exhaust hood assembly 2 is performing exhaust operations, but the added fan mechanism 25 can also exhaust air synchronously, thereby improving the exhaust efficiency of the unpowered exhaust hood.

[0042] The cap body can adopt the existing conventional ones, but it is preferably as follows: the cap body includes a top plate 22 (which can be square, but preferably circular; in this embodiment, the limit seat 36 is installed at the center of the inner surface of the top plate 22 by multiple rivets) arranged above the base 1, a lower ring plate 21 arranged below the top plate 22 and sleeved on the base 1 (the inner diameter of the lower ring plate 21 is greater than the outer diameter of the support sleeve 11, so that the lower ring plate 21 is sleeved on the outer ring of the support sleeve 11) and a plurality of exhaust blades 23 installed between the top plate 22 and the lower ring plate 21. At this time, avoiding the use of a conventional spherical cap body structure can not only reduce the intrusion of rainwater on the flue, but also increase the volume of the cap body and further improve the exhaust efficiency. Specifically, these exhaust blades 23 are usually arranged obliquely and are rotationally symmetrical with the axis of the top plate 22 as the rotational symmetry center, so that two or more adjacent exhaust blades 23 can cooperate with each other to reduce the intrusion of rainwater on the flue.

[0043] In this embodiment, each exhaust blade 23 includes a blade plate 231, connecting pieces 234 formed at both ends of the blade plate 231, and rivets 235 for mounting the connecting pieces 234 on the top plate 22 or / and the lower ring plate 21, so as to ensure the connection strength of the exhaust blade 23 on the cap body. In addition, each exhaust blade 23 also includes an inner guide fold plate 232 formed on the inner side of the blade plate 231 and an outer guide fold plate 233 formed on the outer side of the blade plate 231 (when the unpowered exhaust hood is mounted on the flue and viewed from above, the inner guide fold plate 232 and the outer guide fold plate 233 are both extended in the counterclockwise direction with the axis of the lower ring plate 21 as the center), so that the inner guide fold plate 232 and the outer guide fold plate 233 are located on both sides of the blade plate 231, which can not only further reduce the intrusion of rainwater on the flue, but also increase the disturbance of the airflow to improve the exhaust efficiency.

[0044] In this embodiment, the support mechanism 24 includes a turntable unit rotatably mounted on the support rod 32 and a plurality of hood connecting rods 241 having one end mounted on the hood body and the other end mounted on the turntable unit (the number of hood connecting rods 241 can be conventionally selected according to actual needs, preferably 3 to 9; in this embodiment, there are 5 and they are arranged at equal intervals radially). At this time, the fan mechanism 25 is penetrated by the support rod 32 and installed on the turntable unit (on the surface facing away from the base 1).

[0045] The turntable unit includes a clamping plate 240 sleeved on the support rod 32, a cover plate 242 sleeved on the support rod 32 and installed on the surface of the clamping plate 240 to be connected to multiple hood connecting rods 241 (the cover plate 242 and the clamping plate 240 can cooperate to connect the inner end of the hood connecting rod 241), a first bearing 243 buried in the cover plate 242, and a sleeve 244 fixed (the fixing method here can be a conventional method such as interference fit) in the first bearing 243 and installed on the support rod 32 through a locking member 245 (which can be a conventional method such as a screw) (the sleeve 244 is sleeved on the support rod 32 and locked on its surface by the locking member 245 without generating relative movement, and part of its structure protrudes from the cover plate 242). In this way, the relative rotation connection between the sleeve 244 and the cover plate 242 can be achieved through the first bearing 243 with less friction, thereby improving the effect of unpowered rotation of the hood body.

[0046] A plurality of adapter brackets 246 are installed in the cap body (i.e., a plurality of adapter brackets 246 extending upward are installed on the bottom surface of the lower ring plate 21), so that one end of the hood connecting rod 241 is connected to the adapter bracket 246 one-to-one and the other end is connected to the turntable unit, so that the hood connecting rod 241 can be higher than the supporting sleeve 11 of the base 1, thereby preventing the cap body from being interfered with by the base 1 when rotating.

[0047] The two sides of the hood connecting rod 241 are formed with upwardly extending limiting convex strips 2411. Figure 5 As shown, it includes a plate body 2421, a plurality of connecting rod pressure covers 2423 formed on the plate body 2421 and protruding from the plate body 2421 (the number of the connecting rod pressure covers 2423 is the same as the number of the hood connecting rods 241 and corresponds one to one, and they extend inward from the edge of the plate body 2421), a snap-in groove 2422 formed between each connecting rod pressure cover 2423 and the plate body 2421 and matched with the limiting convex strip 2411 (that is, the two sides of the connecting rod pressure cover 2423 are formed with snap-in grooves 2422 that match with the limiting convex strip 2411), and a first connecting hole 2424 opened on each connecting rod pressure cover 2423, so that conventional connecting parts such as rivets can be installed in the first connecting hole 2424, so that the connecting rod pressure cover 2423, the hood connecting rod 241 and the clamping plate 240 can be connected together, so as to realize the support of the other structures of the entire cap body by the turntable unit combined with the support rod 32.

[0048] In this embodiment, if Figure 6 As shown, the fan mechanism 25 includes a fan base 251 mounted on the other surface of the clamping plate 240 (i.e., the surface away from the cover plate 242) and a fan 252 mounted on the fan base 251, and the support rod 32 passes through the fan base 251 and the fan 252. A second bearing matching the support rod 32 can be embedded in the fan base 251, so that the friction between the fan mechanism 25 and the support rod 32 can be reduced.

[0049] The fan base 251 includes a docking plate 2512 with a plurality of second connection holes 2513 and a mounting seat 2511 formed at the center of the docking plate 2512 (the mounting seat 2511 is hollow). Conventional bolts and other connecting parts can be installed in the second connection holes 2513 to achieve the connection between the fan base 251 and the clamping plate 240 (the connecting parts here can even be the same as the connecting parts used in the aforementioned first connection holes 2424, which can reduce the number of parts and improve the strength of the overall connection). The fan 252 includes a central column 2521 installed in the mounting seat 2511 (the second bearing can be buried in the mounting seat 2511 and the central column 2521) and a plurality of fan blades 2522 formed on the circumference of the central column 2521. A through hole 2523 matching the support rod 32 is opened at the center of the central column 2521, thereby ensuring the rotational connection between the fan mechanism 25 and the support rod 32.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A non-powered exhaust hood, comprising: Base (1); A support assembly (3), the support assembly (3) being mounted on the base (1); An exhaust hood assembly (2), the exhaust hood assembly (2) being mounted on the support assembly (3) and being rotatable relative to the base (1), comprising a hood body and a hood support mechanism (24) mounted in the hood body; The feature is that the exhaust hood assembly (2) further comprises a fan mechanism (25) mounted on the hood support mechanism (24) and rotating along with the hood body or the hood support mechanism (24).

2. The unpowered exhaust hood according to claim 1, characterized in that: The base (1) comprises a supporting sleeve (11) and a fixing ring (12) formed at the bottom of the supporting sleeve (11) and extending outwards, wherein a plurality of mounting holes (121) are formed on the fixing ring (12).

3. The unpowered exhaust hood according to claim 1, characterized in that: The support assembly (3) comprises a support rod (32) having one end mounted on the upper surface of the cap body and the other end having an external thread, a plurality of support members (31) mounted on the inner wall of the support sleeve (11) and arranged at intervals, a lower jacket (34) and an upper jacket (33) sleeved on the support rod (32) and arranged in opposite directions, and two adjusting nuts (35) mounted on the external thread of the support rod (32) and located outside the lower jacket (34) and the upper jacket (33). The inner ends of the plurality of support members (31) are clamped between the upper jacket (33) and the lower jacket (34).

4. The unpowered exhaust hood according to claim 3, characterized in that: A limit seat (36) is installed on the inner surface of the cap body, and one end of the support rod (32) is installed in the limit seat (36).

5. The unpowered exhaust hood according to claim 3, characterized in that: Each of the support members (31) comprises a support transverse plate (311), a first bent piece (314) formed at an end of the support transverse plate (311) and mounted on the inner wall of the support sleeve (11) via a first fastener, and a second bent piece (312) formed at the other end of the support transverse plate (311) via a connecting portion (313), wherein the connecting portion (313) is arc-shaped and cooperates with the support rod (32), and the support transverse plate (311) and the second bent piece (312) are clamped by the upper jacket (33) and the lower jacket (34).

6. The unpowered exhaust hood according to claim 1, characterized in that: The cap body comprises a top plate (22) arranged above the base (1), a lower ring plate (21) arranged below the top plate (22) and sleeved on the base (1), and a plurality of exhaust blades (23) installed between the top plate (22) and the lower ring plate (21). Preferably, the plurality of exhaust blades (23) are rotationally symmetrical with the axis of the top plate (22) as the rotational symmetry center.

7. The unpowered exhaust hood according to claim 6, characterized in that: Each of the exhaust blades (23) comprises a blade plate (231), connecting pieces (234) formed at both ends of the blade plate (231), and rivets (235) for mounting the connecting pieces (234) on the top plate (22) and / or the lower ring plate (21); Preferably, each of the exhaust blades (23) further comprises an inner guide fold plate (232) formed on the inner side of the blade plate (231) and an outer guide fold plate (233) formed on the outer side of the blade plate (231), wherein the inner guide fold plate (232) and the outer guide fold plate (233) are located on both sides of the blade plate (231).

8. The unpowered exhaust hood according to claim 3, characterized in that: The support mechanism (24) comprises a turntable unit rotatably mounted on the support rod (32) and a plurality of hood connecting rods (241) having one end mounted on the hood body and the other end mounted on the turntable unit. The fan mechanism (25) is penetrated by the support rod (32) and mounted on the turntable unit.

9. The unpowered exhaust hood according to claim 8, characterized in that: The turntable unit comprises a clamping plate (240) sleeved on the support rod (32), a cover plate (242) sleeved on the support rod (32) and mounted on the surface of the clamping plate (240) to be connected to a plurality of hood connecting rods (241), a first bearing (243) embedded in the cover plate (242), and a sleeve (244) fixed in the first bearing (243) and mounted on the support rod (32) via a locking member (245); Optimally, a plurality of adapter brackets (246) are installed in the cap body, and one end of the hood connecting rod (241) is connected to the adapter bracket (246) in a one-to-one correspondence so that the hood connecting rod (241) is higher than the base (1); Optimally, limiting convex strips (2411) are formed on both side edges of the hood connecting rod (241), and the cover plate (242) includes a plate body (2421), a plurality of connecting rod pressure covers (2423) formed on the plate body (2421) and protruding from the plate body (2421), a snap-in groove (2422) formed between each connecting rod pressure cover (2423) and the plate body (2421) and matched with the limiting convex strip (2411), and a first connecting hole (2424) provided on each connecting rod pressure cover (2423), and the connecting rod pressure covers (2423) correspond one-to-one with the hood connecting rod (241).

10. The unpowered exhaust hood according to claim 9, characterized in that: The fan mechanism (25) comprises a fan base (251) mounted on the other surface of the clamping plate (240) and a fan (252) mounted on the fan base (251), and the support rod (32) passes through the fan base (251) and the fan (252); Optimally, a second bearing matching the support rod (32) is embedded in the fan base (251); Optimally, the fan base (251) comprises a docking plate (2512) provided with a plurality of second connection holes (2513) and a mounting seat (2511) formed at the center of the docking plate (2512); The fan (252) comprises a central column (2521) mounted in the mounting seat (2511) and a plurality of fan blades (2522) formed on the circumference of the central column (2521); a through hole (2523) matching the support rod (32) is provided at the center of the central column (2521).

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