TW201504528A - Series-connected fan - Google Patents

Abstract

A series-connected fan includes at least two fans connected in series. The fan includes a housing, a driving module and an impeller, wherein the housing including a frame and a base, wherein the frame having two air-guiding openings, wherein an air channel formed between the two air-guiding openings, wherein the driving module mounted on the base of the housing, and wherein the impeller rotatablely coupled to the driving module. At least one of the fans has a positioning hole formed on the frame thereof, with the base coupling to the positioning hole, and with a buffering gap in radial direction formed between the outer lateral wall of the base and the inner lateral wall of the positioning hole. In accordance with the above structure, the buffering gap in radial direction suppresses transmission of vibration between the base and the frame effectively.

Description

Tandem fan

The present invention relates to a tandem fan, and more particularly to a tandem fan constructed by combining at least two fans in series.

The conventional series fan is composed of a plurality of fans connected in series to increase the air volume by using a plurality of fans, thereby achieving better heat dissipation effect; however, in general, the vibration process is usually generated during the operation of the fan, and therefore, several The conventional series fan composed of a fan is also relatively vibrating when applied to various electronic systems (such as a computer mainframe). The vibration situation not only generates noise, but also reduces the operational stability of the electronic system. As a result, the electronic component contacts inside the electronic system are fatigued and aged early, shortening the service life of the electronic system.

For this reason, please refer to the invention patent case of the "seismic structure of the series fan" of the Republic of China Announcement No. I324504, which discloses a conventional tandem fan 9 having a suspension function. The tandem fan 9 includes two fan frames 91 and 92 connected to each other in series. The two fan frames 91 and 92 are respectively provided with a base 911 and 921, and the two bases 911 and 921 are used to combine a fan wheel. A shock absorbing element 93 is disposed between the surface and the surface of the two fan frames 91 and 92 connected in series, and the shock absorbing element 93 is made of an elastic material that has both shock absorption and shock absorption vibration, whereby the two fan frames 91, When the internal fan wheel is in operation, the suspension element 93 can be used to buffer and absorb the vibration generated by the fan wheel to reduce the resonance effect and vibration noise formed by the two fan frames 91 and 92.

However, since the fan wheel of the conventional tandem fan 9 is rotatably coupled to the bases 911 and 921 of the fan frames 91 and 92, the fan wheel is generated during operation. The vibration has a vibration transmission path, that is, a vibration is transmitted to the frame frames 91 and 92 via the bases 911 and 921, and the series fan 9 can reduce the formation of the two fan frames 91 and 92 by the suspension element 93. Resonance effect and vibration noise, but its damping effect is quite limited, so when the tandem fan 9 is applied to an electronic system or an electronic system with a hard disk, the vibration situation also reduces the operational stability of the electronic system, and even causes The hard drive cannot read the signal and still produces unnecessary noise, which reduces the life of the electronic system.

The main object of the present invention is to provide a series fan, which can effectively block the transmission path of the vibration, and can more comprehensively and effectively reduce the vibration generated when the series fan operates, so as to be supplied when used in an electronic system. Maintain the stability of the electronic system and reduce the vibration noise.

In order to achieve the foregoing object, the tandem fan of the present invention comprises at least two fans connected in series, the fan comprising a frame, a driving component and a wheel, the fan frame comprising an outer frame and a base, the outer frame The frame is provided with two air guiding openings, and a guiding channel is disposed between the two air guiding openings, the driving component is disposed on the base of the fan frame, the fan wheel rotatably coupling the driving component; wherein the outer frame of at least one fan is a positioning hole, the positioning hole of the outer frame has a minimum inner diameter, the base has a maximum outer diameter, the maximum outer diameter is less than or equal to the minimum inner diameter; further, the positioning hole is preferably provided with an axial positioning shoulder The pedestal is coupled to the locating hole and abuts the axially positioned shoulder. Preferably, a radial buffer gap is formed between the outer sidewall of the pedestal and the inner sidewall of the locating hole of the outer frame. .

The outer frame of the fan having the radial buffer gap is a hollow frame, and the positioning hole is disposed at a periphery of one of the air guiding ports of the outer frame, and the base of the fan frame comprises a body, a plurality of connecting members and an abutting a connecting member, one end of the connecting member is connected to the seat body, and the other end is connected to the abutting member, the base is fixed to the positioning hole by the abutting member, and the abutting member of the base abuts the axial direction Positioning the shoulder, the radial direction is formed between the outer side wall of the abutting member of the base and the inner side wall of the positioning hole of the outer frame Buffer gap.

The outer frame of the fan with radial buffer gap comprises a hollow frame and several a connecting member and an abutting member, one end of the connecting member is connected to the inner side wall of the hollow frame body, and the other end is connected to the abutting member, the base of the fan frame is a body, and the positioning hole is disposed in the outer frame The inner side wall of the positioning hole of the abutting member forms the axial positioning shoulder, the seat body is fixed to the positioning hole and abuts the axial positioning shoulder, the outer side wall of the seat body and the The radial buffer gap is formed between the inner sidewalls of the locating holes of the abutment.

The outer frame of the fan having the radial buffer gap is a hollow frame, and the positioning hole is disposed at a periphery of one of the air guiding ports of the outer frame, and the base of the fan frame comprises a body and a plurality of connecting members, the base One end of the plurality of connecting members is coupled to the positioning hole, and a peripheral edge of one of the plurality of connecting members abuts the axial positioning shoulder, and an end of one of the plurality of connecting members and the outer frame Forming the radial buffer gap between the inner side walls of the positioning holes, and connecting the other end of the plurality of connecting members to the seat body

The fan is a first fan and a second fan that are connected in series with each other. The radial direction is formed between the outer sidewall of the base of the first fan and the second fan and the inner sidewall of the positioning hole of the outer frame. Buffer gap.

The bases of the first fan and the second fan are axially clamped and fixed between the axially positioned shoulder of the first fan and the axially positioned shoulder of the second fan.

The first fan and the second fan are fixed to each other by a fixing component. Preferably, the fixing component includes at least one first fastening component and at least one second fastening component, the at least one first fastening component is disposed on the first fan, and the at least one second fastening component is disposed on the second The fan, the first fastening component and the second fastening component are detachably coupled.

A suspension element is disposed between the fans.

The base of the first fan and the base of the second fan are respectively provided with a slot, the shock absorber is coupled to the slot, and the shock absorber is disposed on the base of the first fan and the second Between the bases of the fans.

The outer peripheral surface of the shock absorbing element forms a flange, and the base of the first fan and the base of the second fan jointly clamp the flange of the shock absorbing element.

At least one positioning notch is disposed on a periphery of one of the air guiding openings of the outer frame of the fan frame. The base of the fan frame is provided with at least one positioning protrusion corresponding to the positioning notch, and the positioning protrusion is engaged with the positioning notch.

The inner side wall of the positioning notch forms two opposite locking flanges, and the outer side wall of the positioning protrusion forms two guiding flanges, and the positioning protrusions are forced into the positioning gap by the two guiding flanges. The two latching flanges limit the two guiding flanges.

The locating hole of the outer frame of the sash frame is provided with at least one splicing groove. The base of the sash frame is provided with at least one elastic fastening piece corresponding to the fastening groove, and the elastic fastening piece is fastened to the fastening groove.

The maximum outer diameter of the base of at least one of the first fan and the second fan of the tandem fan is not greater than a minimum inner diameter of the outer frame, and preferably fits between the outer frame and the base The radial buffer gap formed, when the series fan is applied to various electronic systems, even if vibration is generated due to the rotation of the fan wheel, the radial buffer gap can be used to greatly reduce the transmission to the outside through the base The vibration of the frame to avoid noise and improve the life of the electronic system.

〔this invention〕

F1‧‧‧First fan

F2‧‧‧second fan

1‧‧‧Fan frame

11‧‧‧Front frame

11a‧‧‧ hollow frame

11b‧‧‧Connecting parts

11c‧‧‧Resistance

111‧‧‧air guide

112‧‧‧air guide

113‧‧‧ Diversion channel

114‧‧‧Positioning holes

115‧‧‧Axial positioning shoulder

116‧‧‧ Positioning gap

117‧‧‧Lock flange

118‧‧‧Snap slot

12‧‧‧ Pedestal

12a‧‧‧ body

12b‧‧‧Connecting parts

121b‧‧‧ Periphery

End of 122b‧‧‧

12c‧‧‧Resistance

121‧‧‧Inlay

122‧‧‧Positioning bumps

122a‧‧‧Guide flange

123‧‧‧Flexible clasps

2‧‧‧Drive components

3‧‧‧fan wheel

4‧‧‧Fixed components

41‧‧‧First fastening

42‧‧‧Second fasteners

5‧‧‧Shock components

51‧‧‧Flange

D‧‧‧ radial buffer gap

D1‧‧‧minimum inner diameter

D2‧‧‧Maximum outer diameter

[study]

9‧‧‧Series fan

91‧‧‧Fan box

911‧‧‧Base

92‧‧‧Fan box

921‧‧‧Base

93‧‧‧Shock components

Figure 1 is a combined cross-sectional view of a conventional tandem fan.

Fig. 2 is an exploded perspective view showing the tandem fan of the first preferred embodiment of the present invention.

Fig. 3 is a sectional view showing the combination of the tandem fan of the first preferred embodiment of the present invention.

Figure 4 is a partially enlarged cross-sectional view showing the tandem fan of the first preferred embodiment of the present invention.

FIG. 5 is an exploded perspective view of the tandem fan of the present invention having a positioning notch and a positioning protrusion.

FIG. 6 is a perspective enlarged view of the tandem fan of the present invention having a positioning notch and a positioning protrusion.

Figure 7 is a perspective enlarged view of the tandem fan of the present invention having a locking flange and a guiding flange.

Figure 8 is a cross-sectional view of the tandem fan of the present invention having a relatively opposing slot for the combination of the suspension elements.

Fig. 9 is a sectional view showing the combination of the tandem fan of the present invention having a back-facing recess for the combination of the suspension elements.

Figure 10 is a cross-sectional view showing the assembly of the suspension element of the tandem fan of the present invention with a flange.

Figure 11 is a sectional view showing the combination of the tandem fan of the second preferred embodiment of the present invention.

Figure 12 is a partially enlarged cross-sectional view showing the tandem fan of the second preferred embodiment of the present invention.

Figure 13 is an exploded perspective view of the tandem fan of the present invention having a fastening groove and an elastic buckle.

FIG. 14 is a perspective enlarged view of the tandem fan of the present invention having a fastening groove and an elastic buckle.

Figure 15 is a partially enlarged cross-sectional view showing the series fan of the present invention having a fastening groove and an elastic buckle.

Figure 16 is an exploded perspective view of a tandem fan according to a third preferred embodiment of the present invention.

Figure 17 is a sectional view showing the combination of the tandem fan of the third preferred embodiment of the present invention.

Figure 18 is a partially enlarged cross-sectional view showing the tandem fan of the third preferred embodiment of the present invention.

Figure 19 is a cross-sectional view showing the combination of the tandem fan of the present invention forming a radial buffer gap in one of the fans.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to Figures 2 and 3, the tandem wind of the first preferred embodiment of the present invention The fan includes at least a first fan F1 and a second fan F2. The first fan F1 and the second fan F2 are axially opposite and coupled in series.

The first fan F1 includes a frame 1, a driving component 2 and a fan wheel 3. The The fan frame 1 includes an outer frame 11 and a base 12, and the outer frame 11 is provided with two air guiding openings 111 and 112. A guiding channel 113 is defined between the two air guiding openings 111 and 112. 112 can be used as an air inlet and an air outlet respectively. In practical applications, any air guiding port can be set as an air inlet or an air outlet. The outer frame 11 is provided with a positioning hole 114, and the positioning hole 114 is provided with an axial positioning shoulder. 115, the base 12 is coupled to the positioning hole 114 and abuts the axial positioning shoulder 115. As shown in FIGS. 3 and 4, the positioning hole 114 of the outer frame 11 has a minimum inner diameter d1. The seat 12 has a maximum outer diameter d2, which is not greater than (ie, less than or equal to) the minimum inner diameter d1. Preferably, the outer side wall of the base 12 and the positioning hole 114 of the outer frame 11 are inside. A radial buffer gap D may be formed between the sidewalls, wherein the radial buffer gap D may be formed by the entire space or part of the space between the outer sidewall of the base 12 and the inner sidewall of the positioning hole 114 of the outer frame 11. . Moreover, the driving assembly 2 is disposed on the base 12 of the fan frame 1. The fan wheel 3 is rotatably coupled to the driving assembly 2 for introducing airflow from one of the air guiding openings 111 into the guiding channel 113, and then The air flow is led out from another air guiding port 112. The driving component 2 is of various structural designs that can drive the rotating of the fan wheel 3, for example, a steel sheet group, a stator coil or a circuit board. The detailed structural composition and the operating principle are Those skilled in the art can understand that it is not described here.

In the first preferred embodiment of the present invention, the outer frame 11 of the fan frame 1 is hollow. The locating hole 114 can be disposed at a periphery of one of the air guiding openings 112 of the outer frame 11 (ie, the hollow frame 11a) for directly forming the axial positioning on the inner side wall of the positioning hole 114 of the outer frame 11. The base portion 12 of the fan frame 1 includes a base body 12a, a plurality of connecting members 12b and an abutting member 12c. The plurality of connecting members 12b are connected to the seat body 12a at one end and the abutting member 12c at the other end. So that the plurality of connecting members 12b can be located between the seat body 12a and the abutting member 12c; The plurality of connecting members 12b may be ribs or vanes (like fan-shaped ribs), and the abutting member 12c may be a fixing ring. Therefore, as shown in FIGS. 3 and 4, the base 12 is coupled to the positioning hole 114 by the abutting member 12c, and the abutting member 12c abuts the axial positioning shoulder 115, and the The radial buffer gap D is formed between the outer side wall of the abutting member 12c of the base 12 and the inner side wall of the positioning hole 114 of the outer frame 11 (i.e., the hollow frame 11a).

Further, as shown in FIGS. 5 and 6, one of the outer frames 11 of the above-described fan frame 1 Preferably, at least one positioning notch 116 is provided in the periphery of the tuyere 112. The pedestal 12 of the framing frame 1 is preferably provided with at least one positioning protrusion 122, and the positioning protrusion 122 can be inserted into the positioning notch 116; Thereby, the engagement of the positioning protrusion 122 and the positioning notch 116 can be reused, the assembly of the outer frame 11 and the base 12 is made easier, and the radial anti-rotation function is provided, and the outer frame 11 and The base 12 also has a more stable joint fixing effect. In addition, as shown in FIG. 7, the inner side wall of the positioning notch 116 preferably further defines two opposite locking flanges 117. The outer side walls of the positioning protrusions 122 preferably cooperate to form two guiding flanges 122a. The positioning protrusions 122 can be forcibly coupled to the positioning notches 116 by the two guiding flanges 122a, and the two guiding flanges 122a are restrained by the two locking flanges 117 to prevent the base 12 from being prevented. Positioning effect of axial shedding.

The second fan F2 of the first preferred embodiment of the present invention and the first fan F1 The structural components are substantially the same, and the same includes the above-described fan frame 1, the drive unit 2, and the fan wheel 3, and therefore, the structural composition of the second fan F2 is not repeated. Therefore, as shown in the second and third figures, the first fan F1 and the second fan F2 of the present invention can be axially opposed and coupled in series, so that the base 12 is axially clamped and fixed to the first fan F1. The axially positioned shoulder 115 is spaced between the axially positioned shoulder 115 of the second fan F2, and the radial buffer gap D is still between the base 12 and the outer frame 11. The first fan F1 and the second fan F2 are further fixed by a fixing component 4 to prevent the first fan F1 and the second fan F2 from being loosened. The fixing component 4 can be a buckle. Fixed structure formed by locking or welding, etc. In the preferred embodiment, the fixing component 4 includes a plurality of first fastening components 41 and a plurality of second fastening components 42 (one of which may also be one), and the plurality of first fastening components 41 are disposed on the first a fan F1, the plurality of second fastening members 42 are disposed on the second fan F2, and the first fastening member 41 and the second fastening member 42 are detachably coupled to each other; Therefore, when the first fan F1 and the second fan F2 are coupled in series, the fixing component 4 can simultaneously provide a fixing function of the first fan F1 and the second fan F2 to prevent axial disengagement and radial anti-rotation.

Please refer to FIG. 8 , between the first fan F1 and the second fan F2 of the present invention. Preferably, a shock absorbing element 5 is further provided, and the shock absorbing element 5 can be made of an elastic material having a shock absorbing and cushioning function, for example, rubber, foam, sponge, superior glue, etc. In the embodiment shown in the figure, the base 12 of the first fan F1 and the base 12 of the second fan F2 are respectively provided with a slot 121 for coupling the suspension element 5, as shown in the embodiment. The base 12 of the first fan F1 and the recess 121 of the base 12 of the second fan F2 are disposed opposite to each other. The suspension element 5 is disposed on the base 12 and the second fan of the first fan F1. Between the pedestals 12 of the F2; or, as shown in FIG. 9, the pedestal 12 of the first fan F1 and the recess 121 of the pedestal 12 of the second fan F2 may also be disposed opposite to each other, and two embedded The suspension element 5 can be clamped and fixed between the slots 121; thereby, when the first fan F1 and the fan wheel 3 of the second fan F2 are simultaneously operated, the vibration generated by the rotation of the fan wheel 3 can also be caused by The suspension element 5 is absorbed and buffered. Alternatively, as shown in FIG. 10, the outer peripheral surface of the suspension element 5 is preferably formed with a flange 51, and the base 12 of the first fan F1 and the base 12 of the second fan F2 are clamped together. The flange 51 of the seismic element 5, whereby the suspension element 5 can be more firmly coupled between the base 12 of the first fan F1 and the base 12 of the second fan F2.

Referring to Figures 11 and 12, the tandem type of the second preferred embodiment of the present invention The fan also includes a first fan F1 and a second fan F2. The structural features and components of the first fan F1 and the second fan F2 are substantially the same as those of the first preferred embodiment. The difference is that in the second preferred embodiment of the present invention, the outer frame 11 of the fan frame 1 is Including a hollow frame 11a, a plurality of connecting members 11b and an abutting member 11c. One end of the plurality of connecting members 11b is connected to the inner side wall of the hollow frame 11a, and the other end is connected to the abutting member 11c, so that the plurality of connecting members 11b are located in the hollow frame. 11a and the abutting member 11c, wherein the plurality of connecting members 11b can be ribs or vanes (like fan-shaped ribs), the abutting member 11c can be a fixing ring; the base of the fan frame 1 The 12 series is a body 12a. The positioning hole 114 is disposed in the abutting member 11c of the outer frame 11 for directly forming the axial positioning shoulder 115 on the inner side wall of the positioning hole 114 of the abutting member 11c. The body 12a) is coupled to the positioning hole 114 and abuts the axial positioning shoulder 115, and the outer side wall of the base 12 (ie, the seat body 12a) and the inner side wall of the positioning hole 114 of the abutting member 11c The radial buffer gap D is formed therebetween.

Moreover, as shown in the figures 13, 14, and 15, the frame 11 of the above-described fan frame 1 is fixed. Preferably, the positioning hole 118 is provided with at least one fastening groove 118. The base 12 of the frame 1 is preferably provided with at least one elastic fastening piece 123. The elastic fastening piece 123 can be fastened to the buckle. The splicing groove 118 is fastened to the fastening groove 118 of the outer frame 11 by the shackle 123 to improve the assembly convenience and prevent the pedestal 12 from falling off axially. Positioning effect.

Referring to Figures 16, 17 and 18, the string of the third preferred embodiment of the present invention The integrated fan also includes a first fan F1 and a second fan F2. The structural features and components of the first fan F1 and the second fan F2 are substantially the same as those of the first preferred embodiment. The difference is that in the third preferred embodiment of the present invention, the base 12 of the fan frame 1 is The abutting member 12c of the first preferred embodiment is omitted; the base 12 is coupled to the positioning hole 114 by one end of the plurality of connecting members 12b not connected to the seat body 12a, and the plurality of connecting members 12b One end edge 121b (shown in FIG. 18) abuts the axial positioning shoulder 115, and one end 122b of one end of the plurality of connecting members 12 and the outer frame 11 (ie, the hollow frame 11a) The radial buffer gap D is formed between the inner sidewalls of the positioning holes 114.

Moreover, the tandem fan disclosed in the above preferred embodiments of the present invention has the same The maximum outer diameter d2 of the base 12 of the first fan F1 and the second fan F2 is not greater than the combined shape of the minimum inner diameter d1 of the positioning hole 114 of the outer frame 11; however, as shown in Fig. 19, the present invention is connected in series The fan may also form the above-described combination between the base 12 of one of the fans and the outer frame 11 according to actual use requirements, as will be understood by those skilled in the art.

The tandem fan disclosed by the above preferred embodiments of the present invention, The maximum outer diameter d2 of the base 12 of at least one of the first fan F1 and the second fan F2 is not greater than the minimum inner diameter d1 of the positioning hole 114 of the outer frame 11, so that the base 12 is axially The first fan F1 and the second fan F2 are clamped and fixed; thereby, when the series fan of the present invention is applied to various electronic systems, and the driving assembly 2 disposed on the base 12 drives the fan wheel 3 to rotate When the vibration is generated, the transmission path of the vibration can be effectively blocked, and the radial buffer gap D can be utilized to greatly reduce the vibration transmitted to the outer frame 11 via the base 12, thereby effectively avoiding the vibration situation. Reducing the operational stability of the electronic system and reducing noise; and in particular, when the suspension element 5 is preferably disposed between the first fan F1 and the second fan F2 of the present invention, even if the base 12 is axially The clamping is fixed, but the vibration generated by the fan wheel 3 can be further buffered by the shock absorbing element 5, so that the buffering and shock absorbing effect can be more significant, so as to avoid noise and improve the use of the electronic system. Life and other effects.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

F1‧‧‧First fan

F2‧‧‧second fan

1‧‧‧Fan frame

11‧‧‧Front frame

11a‧‧‧ hollow frame

111‧‧‧air guide

112‧‧‧air guide

113‧‧‧ Diversion channel

114‧‧‧Positioning holes

115‧‧‧Axial positioning shoulder

12‧‧‧ Pedestal

12a‧‧‧ body

12b‧‧‧Connecting parts

12c‧‧‧Resistance

121‧‧‧Inlay

2‧‧‧Drive components

3‧‧‧fan wheel

4‧‧‧Fixed components

41‧‧‧First fastening

42‧‧‧Second fasteners

Claims (18)

A tandem fan includes: at least two fans combined in series, each fan comprising a frame, a driving component and a fan wheel, the fan frame comprising an outer frame and a base, the outer frame is provided with two guides a tuyere is disposed between the two air guiding openings, the driving component is disposed on the base of the fan frame, and the fan wheel is rotatably coupled to the driving component; wherein the outer frame of the at least one fan is provided with a positioning hole, The base is coupled to the positioning hole, and the positioning hole of the outer frame has a minimum inner diameter, and the base has a maximum outer diameter which is less than or equal to the minimum inner diameter. A tandem fan according to the first aspect of the invention, wherein a radial buffer gap is formed between an outer side wall of the base and an inner side wall of the positioning hole of the outer frame. The tandem fan of claim 2, wherein the positioning hole is provided with an axially positioned shoulder that abuts the axially positioned shoulder. The tandem fan according to the third aspect of the patent application, wherein the outer frame of the fan having the radial buffer gap is a hollow frame, and the positioning hole is disposed at a periphery of one of the air guiding openings of the outer frame, and the base of the fan frame The utility model comprises a body, a plurality of connecting members and an abutting member, wherein one end of the plurality of connecting members is connected to the seat body, and the other end is connected to the abutting member, and the base is fixed to the positioning hole by the abutting member, the base The abutting member of the seat abuts the axial positioning shoulder, and the radial buffer gap is formed between the outer side wall of the abutting member of the base and the inner side wall of the positioning hole of the outer frame. The tandem fan according to the third aspect of the patent application, wherein the outer frame of the fan having the radial buffer gap comprises a hollow frame body, a plurality of connecting members and an abutting member, and one end of the plurality of connecting members is connected to the hollow frame The inner side wall of the body is connected to the abutting member, and the base of the fan frame is a body. The positioning hole is disposed on the abutting member of the outer frame, and the inner side wall of the positioning hole of the abutting member forms the axial direction. Positioning the shoulder, the seat is fixed to the positioning The hole abuts against the axially positioned shoulder, and the radial buffer gap is formed between an outer sidewall of the seat and an inner sidewall of the positioning hole of the abutting member. The tandem fan according to the third aspect of the patent application, wherein the outer frame of the fan having the radial buffer gap is a hollow frame, and the positioning hole is disposed at a periphery of one of the air guiding openings of the outer frame, and the base of the fan frame a body and a plurality of connecting members, wherein one end of the plurality of connecting members of the base is coupled to the positioning hole, and a peripheral edge of one end of the plurality of connecting members abuts the axial positioning shoulder, the plurality of connections The radial buffer gap is formed between an end of one end of the piece and an inner side wall of the positioning hole of the outer frame, and the other end of the plurality of connecting members is connected to the base. The tandem fan according to claim 3, 4, 5 or 6 wherein the fan is a first fan and a second fan connected in series with each other, and the base of the first fan and the second fan The radial buffer gap is formed between the outer sidewall and the inner sidewall of the positioning hole of the outer frame. The tandem fan of claim 7, wherein the bases of the first fan and the second fan are axially clamped and fixed to an axially positioned shoulder of the first fan and an axial direction of the second fan Position between the shoulders. The tandem fan according to claim 7, wherein the first fan and the second fan are fixed to each other by a fixing component. The tandem fan according to claim 9 , wherein the fixing component comprises at least one first fastening component and at least one second fastening component, wherein the at least one first fastening component is disposed on the first fan, the at least A second fastening component is disposed on the second fan, and the first fastening component is detachably coupled to the second fastening component. A tandem fan according to the first, second, third, fourth, fifth or sixth aspect of the patent application, wherein a suspension element is disposed between each fan. a tandem fan according to item 7 of the patent application, wherein the first fan and the first A suspension element is arranged between the two fans. The tandem fan of claim 12, wherein the base of the first fan and the base of the second fan are respectively provided with a slot, the shock absorber is coupled to the slot, and the shock absorber is disposed on the Between the base of the first fan and the base of the second fan. The tandem fan of claim 12, wherein the outer peripheral surface of the shock absorbing element forms a flange, and the base of the first fan and the base of the second fan jointly clamp the flange of the shock absorbing element. According to the tandem fan of the first, second, third, fourth, fifth or sixth aspect of the patent application, wherein at least one of the air guiding openings of the outer frame of the frame is provided with at least one positioning notch, and the base of the frame corresponds to The positioning notch is provided with at least one positioning protrusion, and the positioning protrusion is engaged with the positioning notch. The tandem fan of claim 15 wherein the inner side wall of the positioning notch forms two opposite locking flanges, and the outer side wall of the positioning protrusion forms two guiding flanges, and the positioning protrusions are guided by the two guiding A flange is forced into the positioning notch, and the two locking flanges limit the two guiding flanges. According to the series fan of the first, second, third, fourth, fifth or sixth aspect of the patent application, the positioning hole of the outer frame of the fan frame is provided with at least one fastening groove, and the base of the frame corresponds to the fastening groove At least one elastic buckle is disposed, and the elastic buckle is fastened to the fastening groove. A tandem fan according to claim 4 or 5, wherein the abutting member is a fixed ring.