Centrifugal fan

Abstract

A centrifugal fan includes an impeller and a motor connected to the impeller, and is assembled to drive the impeller to rotate; and a first fan frame and a second fan frame. The first fan frame includes a first side surface, a first flow guiding wall, an air inlet, a first air outlet, a second air outlet, a first flow guiding pipe, and a second flow guiding pipe. The second fan frame includes a second side surface and a second flow guiding wall. The first side surface and the second side surface face each other. Through the connection of the first flow guiding wall and the second flow guiding wall with each other, a receiving space and a flow guiding channel are jointly defined. The receiving space houses the impeller and the motor, and the flow guiding channel communicates between the receiving space and the first air outlet; the first flow guiding pipe communicates between the receiving space and the first air outlet, and the second flow guiding pipe is disposed on the side wall of the first flow guiding pipe to communicate with the second air outlet; the first air outlet is in the same direction as the axial direction of the air inlet and the impeller, and the second air outlet is in a different direction from the first air outlet.

Description

[0001] This application is a divisional application of the patent application with the application date of March 26, 2020, the application number of 202010224760.6, and the invention title of "Centrifugal Fan". Technical Field

[0002] This case relates to a centrifugal fan, especially a centrifugal fan with an air inlet and an air outlet located on the same side. Background Art

[0003] In recent years, fan structures have been widely used in vehicle air circulation systems. Since centrifugal fans have the advantages of a streamlined structure, low power consumption, and low noise, they are suitable for gas circulation inside vehicles.

[0004] However, existing centrifugal fans adopt designs such as an axial air inlet and a lateral air outlet or a lateral air inlet and an axial air outlet. When a centrifugal fan is installed in a limited enclosed space such as inside a vehicle, sufficient space must be provided for gas to flow between the air inlet and the air outlet. If one of the air inlet and the air outlet is blocked, the centrifugal fan will not be able to function, and the gas inside the vehicle will not be able to circulate sufficiently.

[0005] Furthermore, since the air inlets and air outlets of existing centrifugal fans are located on different sides respectively, when an external device such as a PM2.5 particle detection device is to be combined to monitor the air inside the vehicle, the external device needs to be adjacent to one of the air inlet or the air outlet, requiring a relatively large combination space, and it is also not easy for the external device for monitoring the air inside the vehicle to compare the differences in air quality at the air inlet and the air outlet.

[0006] In view of this, it is necessary to provide a centrifugal fan to improve the air circulation efficiency and solve the problems faced by the existing art. Summary of the Invention

[0007] The purpose of this case is to provide a centrifugal fan. By setting the air inlet and the air outlet on the same side of the centrifugal fan, when the centrifugal fan is installed in a limited space such as inside a vehicle, the installation space required for the centrifugal fan can be reduced, and at the same time, it is ensured that the air circulation efficiency of the centrifugal fan is not affected by the installation space limitation. Furthermore, when an external device such as a PM2.5 particle detection device is combined to monitor the air quality inside the vehicle, the external device is conducive to simultaneously monitoring the air quality at the air inlet and the air outlet and obtaining the differences therebetween.

[0008] Another object of the present case is to provide a centrifugal fan. Its guiding channel has cross-sectional areas of different sizes, which is beneficial to improving the efficiency of air circulation between the air inlet and the air outlet. The transmission area gradually decreases along the direction of air flow inside the centrifugal fan, which can increase the pressure of air circulation and the flow velocity. Furthermore, combined with the design that the rotation center of the impeller and the air inlet are misaligned with each other, it is more beneficial to improve the transmission efficiency of the centrifugal fan.

[0009] To achieve the foregoing object, the present case provides a centrifugal fan, comprising: an impeller; a motor connected to the impeller and configured to drive the impeller to rotate; and a first fan frame and a second fan frame, wherein the first fan frame includes a first side surface, a first guiding wall, an air inlet, a first air outlet, a second air outlet, a first guiding pipe and a second guiding pipe, and the second fan frame includes a second side surface and a second guiding wall, wherein the first side surface and the second side surface are opposite to each other, and are assembled and connected to each other through the first guiding wall and the second guiding wall, jointly defining a receiving space and a guiding channel, the receiving space accommodating the impeller and the motor, and the guiding channel communicating between the receiving space and the first air outlet; wherein the first guiding pipe communicates between the receiving space and the first air outlet, and the second guiding pipe is disposed on the side wall of the first guiding pipe to communicate with the second air outlet; wherein the first air outlet is in the same direction as the axial direction of the air inlet and the impeller, and the second air outlet is in a different direction from the first air outlet.

[0010] To achieve the foregoing object, the present case further provides a centrifugal fan, comprising: an impeller; a motor connected to the impeller and configured to drive the impeller to rotate; and a first fan frame and a second fan frame, wherein the first fan frame includes a first side surface, a first guiding wall, an air inlet, a first air outlet, a second air outlet, a first guiding pipe and a second guiding pipe, and the second fan frame includes a second side surface and a second guiding wall, wherein the first side surface and the second side surface are opposite to each other, and are assembled and connected to each other through the first guiding wall and the second guiding wall, jointly defining a receiving space and a guiding channel, the receiving space accommodating the impeller and the motor, and the guiding channel communicating between the receiving space and the first air outlet, and the guiding channel has cross-sectional areas of different sizes; wherein the first guiding pipe communicates between the receiving space and the first air outlet, and the second guiding pipe is disposed on the side wall of the first guiding pipe to communicate with the second air outlet; wherein the first air outlet is in the same direction as the axial direction of the air inlet and the impeller, and the second air outlet is in a different direction from the first air outlet. Description of the Drawings

[0011] Figure 1 To disclose the three-dimensional structure diagram of the centrifugal fan according to the first preferred embodiment of the present case.

[0012] Figure 2 To disclose the exploded structure diagram of the centrifugal fan according to the first preferred embodiment of the present case.

[0013] Figure 3 It is an exploded view of the centrifugal fan of the first preferred embodiment of this case from another perspective.

[0014] Figure 4 It is a top view of the centrifugal fan of the first preferred embodiment of this case.

[0015] Figure 5 It is a schematic diagram showing the flow guiding direction of the flow guiding channel of the centrifugal fan of the first preferred embodiment of this case.

[0016] Figure 6A It is a cross-sectional view of the centrifugal fan of the first preferred embodiment of this case.

[0017] Figure 6B It is a three-dimensional structure diagram of the first fan frame of the centrifugal fan of the first preferred embodiment of this case.

[0018] Figure 6C It is a three-dimensional structure diagram of the second fan frame of the centrifugal fan of the first preferred embodiment of this case.

[0019] Figure 7 It is a cross-sectional view of the centrifugal fan of the first preferred embodiment of this case from another perspective.

[0020] Figure 8 It is a cross-sectional view of the centrifugal fan of the second preferred embodiment of this case.

[0021] Figure 9 It is a top view of the centrifugal fan of the third preferred embodiment of this case.

[0022] Figure 10 It is a top view of the centrifugal fan of the fourth preferred embodiment of this case.

[0023] Figure 11A It is a cross-sectional view of the centrifugal fan of the fifth preferred embodiment of this case.

[0024] Figure 11B It is a three-dimensional structure diagram of the first fan frame of the centrifugal fan of the fifth preferred embodiment of this case.

[0025] Figure 11C It is a three-dimensional structure diagram of the second fan frame of the centrifugal fan of the fifth preferred embodiment of this case.

[0026] Figure 12A It is a cross-sectional view of the centrifugal fan of the sixth preferred embodiment of this case.

[0027] Figure 12B It is a three-dimensional structure diagram of the first fan frame of the centrifugal fan of the sixth preferred embodiment of this case.

[0028] Figure 12CIt is a three-dimensional structure diagram of the second fan frame of the centrifugal fan revealing the sixth preferred embodiment of this case.

[0029] Figure 13 It is an exploded view of the centrifugal fan revealing the seventh preferred embodiment of this case.

[0030] Figure 14 It is a three-dimensional structure diagram of the centrifugal fan revealing the eighth preferred embodiment of this case.

[0031] Figure 15 It is an exploded view of the centrifugal fan revealing the eighth preferred embodiment of this case.

[0032] Figure 16 It is an exploded view of the centrifugal fan revealing the eighth preferred embodiment of this case from another perspective.

[0033] Figure 17 It is Figure 17 It is a top view of the centrifugal fan revealing the eighth preferred embodiment of this case.

[0034] Figure 18 It is to reveal Figure 17 It is a cross-sectional view on the AA' connection line.

[0035] Figure 19 It is a cross-sectional view of the centrifugal fan revealing the ninth preferred embodiment of this case.

[0036] Figure 20 It is a three-dimensional structure diagram of the centrifugal fan revealing the tenth preferred embodiment of this case.

[0037] Figure 21 It is a three-dimensional structure diagram of the centrifugal fan revealing the eleventh preferred embodiment of this case.

[0038] Figure 22 It is an exploded view of the centrifugal fan revealing the eleventh preferred embodiment of this case.

[0039] Figure 23 It is an exploded view of the centrifugal fan revealing the eleventh preferred embodiment of this case from another perspective.

[0040] Figure 24 It is a three-dimensional structure diagram of the centrifugal fan revealing the twelfth preferred embodiment of this case.

[0041] Figure 25 It is an exploded view of the centrifugal fan revealing the twelfth preferred embodiment of this case.

[0042] Figure 26 It is an exploded view of the centrifugal fan revealing the twelfth preferred embodiment of this case from another perspective.

[0043] Figure 27To disclose the three-dimensional structure diagram of the centrifugal fan of the thirteenth preferred embodiment of this case.

[0044] Figure 28 To disclose the exploded view of the centrifugal fan of the thirteenth preferred embodiment of this case.

[0045] Figure 29 To disclose the exploded view of the centrifugal fan of the thirteenth preferred embodiment of this case from another perspective.

[0046] Among them, the reference numerals are:

[0047] 1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j, 1k, 1m: Centrifugal fan

[0048] 10: Impeller

[0049] 20: Motor

[0050] 30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30i, 30j, 30k, 30m: First fan frame

[0051] 31: First side

[0052] 32, 32a, 32b, 32c, 32d: First guide wall

[0053] 321, 322: Side wall

[0054] 323, 323a, 323b, 324, 324a, 324b: Guide part 33, 33a, 33b: Air inlet

[0055] 331: First opening

[0056] 332: Second opening

[0057] 341, 341a: First air outlet

[0058] 3411: First sub-air outlet

[0059] 3412: Second sub-air outlet

[0060] 342: Second air outlet

[0061] 343: Third air outlet

[0062] 344: Fourth air outlet

[0063] 351: First guide pipe

[0064] 3511: Connection end

[0065] 352, 352a: Second guide pipe

[0066] 353: The third diversion pipe

[0067] 354: The fourth diversion pipe

[0068] 36: The partition board

[0069] 40, 40a, 40b, 40c, 40d, 40e: The second frame

[0070] 41: The second side

[0071] 42, 42a, 42b, 42c, 42d: The second diversion wall

[0072] 421, 422: The side walls

[0073] 423, 423a, 423b, 424, 424a, 424b: The diversion part 431: The fifth air outlet

[0074] 432: The sixth air outlet

[0075] 441: The fifth diversion pipe

[0076] 442: The sixth diversion pipe

[0077] 50: The accommodation space

[0078] 51: The diversion channel

[0079] 51a, 51c: The first diversion channel

[0080] 51b, 51d: The second diversion channel

[0081] 60: The pressurizing component

[0082] 611: The pressurizing air outlet

[0083] 612: The pressurizing pipe

[0084] 613: The connecting part

[0085] 614: The connecting opening

[0086] 70: The branch pipe

[0087] 711: The first branch air outlet

[0088] 712: The second branch air outlet

[0089] C1: The center

[0090] C2: The rotation center

[0091] X, Y, Z: The axes Detailed implementation manners

[0092] Some exemplary embodiments embodying the features and advantages of the present case will be described in detail in the following description. It should be understood that the present case can have various variations in different aspects, all of which do not depart from the scope of the present case, and the descriptions and drawings therein are essentially for illustrative purposes and not for limiting the present case.

[0093] Figure 1 FIG. 2 is a perspective view of a centrifugal fan according to a first preferred embodiment of the present case. Figure 3 FIG. 3 is an exploded view of the centrifugal fan according to a first preferred embodiment of the present case. Figure 4 FIG. 4 is a top view of the centrifugal fan according to a first preferred embodiment of the present case. In this embodiment, the centrifugal fan 1 includes an impeller 10, a motor 20, a first fan frame 30, and a second fan frame 40. The motor 20 is connected to the impeller 10 and is assembled to drive the impeller 10 to rotate. The first fan frame 30 and the second fan frame 40 are combined with each other and jointly define an accommodation space 50 for accommodating the impeller 10 and the motor 20. In this embodiment, the first fan frame 30 includes a first side surface 31, at least one first guide wall 32, an air inlet 33, and at least one first air outlet 341. The air inlet 33 is disposed on the first side surface 31. At least one first guide wall 32 is connected to the first side surface 31, and at least one first air outlet 341 and the air inlet 33 are located on the same side of the centrifugal fan 1. The second fan frame 40 includes a second side surface 41 and at least one second guide wall 42. At least one second guide wall 42 is connected to the second side surface 41. The first side surface 31 and the second side surface 41 are opposite to each other and are connected through at least one first guide wall 32 and at least one second guide wall 42. At least one first air outlet 341 and the air inlet 33 are located on the first side surface 31 of the first fan frame 30, opposite to the second side surface 41 of the second fan frame 40. The air inlet 33, at least one first air outlet 341, and the axial direction of the impeller 10 are in the same direction. For example, the air inlet 33, at least one first air outlet 341, and the axial direction of the impeller 10 are arranged along the Z-axis, so that the air inlet 33, at least one first air outlet 341, and the axial direction of the impeller 10 are in the same direction. In this embodiment, at least one first guide wall 32 and at least one second guide wall 42 are connected to each other and form at least one guide channel 51 on the X-Y plane. The guide channel 51 communicates between the accommodation space 50 and at least one first air outlet 341, and the guide channel 51 further has cross-sectional areas of different sizes to improve the air flow efficiency between the air inlet 33 and the first air outlet 341.

[0094] It should be noted that at least one first air outlet 341 and the air inlet 33 are located on the same side of the centrifugal fan 1. The air inlet 33, the first air outlet 341 and the axial direction of the impeller 10 are in the same direction (Z-axis). When the centrifugal fan 1 is installed in a limited space such as in a vehicle, the installation space required for the centrifugal fan 1 can be reduced, and at the same time, it is ensured that the air circulation efficiency of the centrifugal fan 1 is not affected by the installation space limitation. Furthermore, when an external device such as a PM2.5 particle detection device is combined to monitor the air quality in the vehicle, the external device is conducive to simultaneously monitoring the air quality at the air inlet 33 and at least one first air outlet 341 and obtaining the difference therebetween.

[0095] Figure 5 FIG. 4 is a schematic diagram showing the flow direction of the flow guiding channel of the centrifugal fan according to the first preferred embodiment of the present case. Figure 6A FIG. 6 is a cross-sectional view of the centrifugal fan according to the first preferred embodiment of the present case.

[0096] Figure 6B FIG. 10 is a three-dimensional structure diagram of the first fan frame of the centrifugal fan according to the first preferred embodiment of the present case. Figure 6C FIG. 12 is a three-dimensional structure diagram of the second fan frame of the centrifugal fan according to the first preferred embodiment of the present case. Referring to FIGS. 1 to 5 and FIGS. 6A to 6C. In this embodiment, at least one first flow guiding wall 32 and at least one second flow guiding wall 42 correspond to each other in space. At least one first flow guiding wall 32 includes a pair of side walls 321, 322, the pair of side walls 321, 322 face each other, and the distance between them gradually decreases along the direction from the impeller 10 to the at least one first air outlet 341, so as to gradually reduce the size of the cross-sectional area of the flow guiding channel 51. At least one second flow guiding wall 42 includes a pair of side walls 421, 422, the pair of side walls 421, 422 face each other, and the distance between them gradually decreases along the direction from the impeller 10 to the at least one first air outlet 341, so as to gradually reduce the size of the cross-sectional area of the flow guiding channel 51. Thereby, when at least one first flow guiding wall 32 and at least one second flow guiding wall 42 are assembled with each other, the formed flow guiding channel 51 gradually reduces the cross-sectional area, which is beneficial to improving the air circulation efficiency between the air inlet 33 and the first air outlet 341. Gradually reducing the cross-sectional area along the direction of air flow in the centrifugal fan 1 can increase the air circulation pressure and increase the flow rate. Furthermore, the impeller 10 has a rotation center C2, and the air inlet 33 has a center C1, wherein the rotation center C2 of the impeller 10 and the center C1 of the air inlet 33 are offset from each other, thereby being more beneficial to improving the transmission efficiency of the centrifugal fan 1.

[0097] Figure 7A cross-sectional view of the centrifugal fan according to the first preferred embodiment of the present case from another perspective. In this embodiment, in addition to the first air outlet 341, the first fan frame 30 further includes a first draft tube 351, a second air outlet 342, and a second draft tube 352. At least one first draft wall 32 extends from the first side surface 31. The first draft tube 351 extends from the first side surface 31 in the same direction as the axial direction of the air inlet 33 and the impeller 10, and the first air outlet 341 is formed at one end of the first draft tube 351. The first air outlet 341 communicates with the accommodation space 50 through the first draft tube 351, and the second draft tube 352 communicates between the first draft tube 351 and the second air outlet 342, wherein the first draft tube 351 is communicated with the accommodation space 50 through the draft channel 51. Also, the first draft tube 351 and the first air outlet 341 are in the same direction as the axial direction of the air inlet 33 and the shaft 10 of the impeller. Thereby, the flow rate and direction of the air driven by the centrifugal fan 1 can be adjusted according to the actual application requirements. In this embodiment, the first draft tube 351 has an inner diameter that gradually decreases in the direction from the accommodation space 50 to the first air outlet 341 (for example, in the Z-axis direction), thereby increasing the pressure of the air flow and increasing the flow velocity. In addition, the first draft tube 351 includes a connection end 3511, and the connection end 3511 has a gradually expanding guide angle connected to the first side surface 31, which can further increase the draft effect. On the other hand, the second draft tube 352 has a uniform inner diameter. Of course, the present case is not limited thereto. In this embodiment, the inner diameter of the second draft tube 352 is smaller than the inner diameter of the first draft tube 351, and the second draft tube 352 is vertically connected to the side wall of the first draft tube 351, but it is not limited thereto.

[0098] Figure 8 A cross-sectional view of the centrifugal fan according to the second preferred embodiment of the present case. In this embodiment, the centrifugal fan 1a is similar to the centrifugal fan 1 shown in FIGS. 1 to Figure 7 and the same component reference numerals represent the same components, structures, and functions, which will not be described in detail herein. In this embodiment, the first fan frame 30a also includes a first air outlet 341, a first draft tube 351, a second air outlet 342, and a second draft tube 352a. Different from the second draft tube 352 of the first fan frame 30 in the foregoing embodiment, the inner diameter of the second draft tube 352a gradually increases in the direction from the first draft tube 351 to the second air outlet 342 (for example, in the Y-axis direction), so as to change the pressure or flow rate at the first air outlet 341 and the second air outlet 342. Of course, the present case is not limited thereto.

[0099] Figure 9 A top view of the centrifugal fan according to the third preferred embodiment of the present case. In this embodiment, the centrifugal fan 1b is similar to the centrifugal fan 1 shown in FIGS. 1 to Figure 7Similar to the centrifugal fan 1 shown, the same component reference numerals represent the same components, structures, and functions, which will not be described herein again. In this embodiment, the air inlet 33a of the first fan frame 30b is non-circular and has a geometric center, wherein the rotation center C2 of the impeller 10 is misaligned with the geometric center of the air inlet 33a, thereby being more conducive to improving the transmission efficiency of the centrifugal fan 1b.

[0100] Figure 10 The upper view of the centrifugal fan showing the fourth preferred embodiment of the present case. In this embodiment, the centrifugal fan 1c is similar to Figures 1 to 7 the centrifugal fan 1 shown, and the same component reference numerals represent the same components, structures, and functions, which will not be described herein again. In this embodiment, the air inlet 33b of the first fan frame 30c further includes a first opening 331 and a second opening 332, which are respectively misaligned with the rotation center C1 of the impeller 10, so that the rotation center C2 of the impeller 10 is misaligned with the air inlet 33, which is more conducive to improving the transmission efficiency of the centrifugal fan 1c. In one embodiment, the first opening 331 is circular and the second opening 332 is quadrilateral, but not limited thereto.

[0101] Figure 11A The cross-sectional view of the centrifugal fan showing the fifth preferred embodiment of the present case. Figure 11B The three-dimensional structure diagram of the first fan frame of the centrifugal fan showing the fifth preferred embodiment of the present case. Figure 11C The three-dimensional structure diagram of the second fan frame of the centrifugal fan showing the fifth preferred embodiment of the present case. In this embodiment, the centrifugal fan 1d is similar to Figures 1 to 7The centrifugal fan 1 shown is similar, and the same component reference numerals represent the same components, structures, and functions, which will not be described in detail herein. In this embodiment, at least one first flow guiding wall 32a of the first fan frame 30d and at least one second flow guiding wall 42a of the second fan frame 40a correspond to each other spatially. At least one first flow guiding wall 32a further includes a flow guiding portion 323 in addition to a pair of side walls 321, 322. The flow guiding portion 323 is disposed between the pair of side walls 321, 322 and connected to the opposite ends of the pair of side walls 321, 322. Among them, the flow guiding portion 323 is away from the impeller 10, and the flow guiding portion 323 is preferably, for example, an inclined surface. At least one second flow guiding wall 42a further includes a flow guiding portion 423 in addition to a pair of side walls 421, 422. The flow guiding portion 423 is disposed between the pair of side walls 421, 422 and connected to the opposite ends of the pair of side walls 421, 422. Among them, the flow guiding portion 423 is away from the impeller 10, and the flow guiding portion 423 is preferably, for example, an inclined surface. The flow guiding portion 323 of at least one first flow guiding wall 32a and the flow guiding portion 423 of at least one second flow guiding wall 42a are connected to each other to form a continuous inclined surface, as shown in FIG. 11A. Since the inclined surface formed by the flow guiding portion 323 and the flow guiding portion 423 is provided in the flow guiding channel 51, the continuous inclined surface can provide a flow guiding function with respect to the first air outlet 341 in space to reduce the air flow resistance. Thereby, the centrifugal fan 1d further improves the air flow efficiency between the air inlet 33 and the first air outlet 341.

[0102] Figure 12A FIG. is a cross-sectional view of the centrifugal fan according to the sixth preferred embodiment of the present invention. Figure 12B FIG. is a three-dimensional structural view of the first fan frame of the centrifugal fan according to the sixth preferred embodiment of the present invention. Figure 12C FIG. is a three-dimensional structural view of the second fan frame of the centrifugal fan according to the sixth preferred embodiment of the present invention. In this embodiment, the centrifugal fan 1e is similar to the centrifugal fan 1d shown in FIGS. 11A to 11C, and the same component reference numerals represent the same components, structures, and functions, which will not be described in detail herein. In this embodiment, at least one first flow guiding wall 32b of the first fan frame 30e and at least one second flow guiding wall 42b of the second fan frame 40b correspond to each other spatially. Among them, the flow guiding portion 323a on the first fan frame 30e is more preferably, for example, a curved surface. The flow guiding portion 423a on the second fan frame 40b is also preferably, for example, a curved surface. The flow guiding portion 323a of at least one first flow guiding wall 32b and the flow guiding portion 423a of at least one second flow guiding wall 42b are connected to each other to form a continuous curved surface, as Figure 12A shown in FIG., the smooth curved surface can provide a flow guiding function with respect to the first air outlet 341 in space to reduce the air flow resistance. Thereby, the centrifugal fan 1e further improves the air flow efficiency between the air inlet 33 and the first air outlet 341.

[0103] Figure 13The structural exploded view of the centrifugal fan according to the seventh preferred embodiment of the present case is shown. In this embodiment, the centrifugal fan 1f is similar to the centrifugal fan 1 shown in Figures 1 to 7 The centrifugal fan 1f is similar to the centrifugal fan 1 shown, and the same component numbers represent the same components, structures, and functions, which will not be described in detail herein. In this embodiment, the centrifugal fan 1f further includes a pressurizing component 60, which is detachably connected to the air inlet 33 on the first side surface 31 of the first fan frame 30f. The pressurizing component 60 includes a connecting portion 613, a connecting opening 614, a pressurizing air outlet 611, and a pressurizing pipe 612. The connecting opening 614 is provided at one end of the connecting portion 613, is spatially opposite to the air inlet 33, and is paired and connected with the air inlet 33. The pressurizing pipe 612 is connected to the other end of the connecting portion 613. The pressurizing air outlet 611 is opposite to the connecting opening 614, and is communicated with the connecting portion 613 through the pressurizing pipe 612 to the connecting opening 614 and the air inlet 33. In this embodiment, the inner diameter of the pressurizing pipe 612 is smaller than the inner diameter of the connecting portion 613, and the centers of the pressurizing air outlet 611 and the connecting opening 614 are offset from each other. The pressurizing air outlet 611 and the pressurizing pipe 612 are more eccentrically arranged relative to the connecting portion 613 and the connecting opening 614. By providing the pressurizing component 60, the centrifugal fan 1f further improves the air circulation efficiency between the air inlet 33 and the first air outlet 341.

[0104] Figure 14 The three-dimensional structure diagram of the centrifugal fan according to the eighth preferred embodiment of the present case is shown. Figures 15 and Figure 16 The structural exploded view of the centrifugal fan according to the eighth preferred embodiment of the present case is shown. Figure 17 For Figure 17 The top view of the centrifugal fan according to the eighth preferred embodiment of the present case is shown. Figure 18 For disclosure Figure 17 The cross-sectional view on the AA' connection line in the middle is shown. In this embodiment, the centrifugal fan 1g is similar to Figures 1 to 7Similar to the centrifugal fan 1 shown, the same component reference numerals represent the same components, structures, and functions, and will not be described in detail herein. In this embodiment, the centrifugal fan 1g includes an impeller 10, a motor 20, a first fan frame 30g, and a second fan frame 40c. In this embodiment, the first fan frame 30g includes a first side surface 31, at least one first flow guiding wall 32c, an air inlet 33, a first air outlet 341, a second air outlet 342, a third air outlet 343, a fourth air outlet 344, a first flow guiding pipe 351a, a second flow guiding pipe 352, a third flow guiding pipe 353, and a fourth flow guiding pipe 354. The second fan frame 40c includes a second side surface 41 and at least one second flow guiding wall 42c, wherein at least one second flow guiding wall 42c is connected to the second side surface 41. The first side surface 31 of the first fan frame 30g and the second side surface 41 of the second fan 40c are two opposite side surfaces. The air inlet 33 of the first fan frame 30g is disposed on the first side surface 31, and the first air outlet 341, the second air outlet 342, the third air outlet 343, the fourth air outlet 344, and the air inlet 33 are all located on the same side of the centrifugal fan 1g, that is, the first air outlet 341, the second air outlet 342, the third air outlet 343, the fourth air outlet 344, and the air inlet 33 are all located on the first side surface 31 of the first fan frame 30g, opposite to the second side surface 41 of the second fan frame 40c. In this embodiment, the first flow guiding pipe 351a communicates between the accommodating space 50 and the first air outlet 341, and the second flow guiding pipe 352 communicates between the first flow guiding pipe 351a and the second air outlet 342. The third flow guiding pipe 353 communicates between the accommodating space 50 and the third air outlet 343, and the fourth flow guiding pipe 354 communicates between the third flow guiding pipe 353 and the fourth air outlet 344. Also, the first flow guiding pipe 351a and the first air outlet 341, the third flow guiding pipe 353 and the third air outlet 343, and the air inlet 33 and the axial direction of the impeller 10 are in the same direction. The first flow guiding pipe 351a, the second flow guiding pipe 352, the third flow guiding pipe 353, and the fourth flow guiding pipe 354 are more preferably integrally formed with the first fan frame 30g. However, the present case is not limited thereto. In this embodiment, the structures and functions of the third flow guiding pipe 353 and the fourth flow guiding pipe 354 are similar to those of the first flow guiding pipe 351a and the second flow guiding pipe 352, and will not be described in detail herein.

[0105] In this embodiment, the air inlet 33, the first air outlet 341 and the third air outlet 343 face the Z-axis direction, which is the same as the axial direction of the impeller 10. The first guide pipe 351a communicating with the first air outlet 341 and the third guide pipe 353 communicating with the third air outlet 343 can be connected to, for example, the first side surface 31 of the first fan frame 30g and are respectively located on two opposite sides of the impeller 10 to provide the function of air circulation on two opposite sides of the impeller 10. Relative to the first guide pipe 351a communicating with the first air outlet 341 and the third guide pipe 353 communicating with the third air outlet 343, at least one first guide wall 32c and at least one second guide wall 42c are assembled to form a first guide channel 51a and a second guide channel 51b. The first guide channel 51a communicates between the accommodation space 50 and the first guide pipe 351a, and the second guide channel 51b communicates between the accommodation space 50 and the third guide pipe 353. In this embodiment, the cross-sectional area of the first guide channel 51a gradually decreases along the direction from the impeller 10 to the at least one first air outlet 341 to improve the air circulation efficiency between the air inlet 33 and the first air outlet 341. The cross-sectional area of the second guide channel 51b gradually decreases along the direction from the impeller 10 to the at least one third air outlet 343 to improve the air circulation efficiency between the air inlet 33 and the third air outlet 343. In one embodiment, the first guide channel 51a and the second guide channel 51b are located on two opposite sides of the impeller 10 and are offset from each other to respectively provide the guiding function. Figure 19 FIG. is a cross-sectional view of a centrifugal fan revealing the ninth preferred embodiment of the present case. In the centrifugal fan 1h, relative to the first guide pipe 351a communicating with the first air outlet 341 and the third guide pipe 353 communicating with the third air outlet 343, at least one first guide wall 32d of the first fan frame 30h and at least one second guide wall 42d of the second fan frame 40d are assembled to form opposite first guide channel 51c and second guide channel 51d to improve the air circulation efficiency from the air inlet 33 to the first air outlet 341 and the third air outlet 343. Of course, the present case is not limited thereto.

[0106] Please refer to Figure 14to Figure 18. In this embodiment, at least one first flow guiding wall 32c and at least one second flow guiding wall 42c correspond to each other spatially. At least one first flow guiding wall 32c may, for example, include two flow guiding portions 323a, 324a, which are respectively opposite to the first air outlet 341 and the third air outlet 343 spatially. At least one second flow guiding wall 42c may, for example, include two flow guiding portions 423a, 424a, which are respectively opposite to the first air outlet 341 and the third air outlet 343 spatially. The flow guiding portion 323a of at least one first flow guiding wall 32c and the flow guiding portion 423a of at least one second flow guiding wall 42 are connected to each other to form a continuous curved surface, so as to improve the air circulation efficiency between the air inlet 33 and the first air outlet 341. The flow guiding portion 324a of at least one first flow guiding wall 32c and the flow guiding portion 424a of at least one second flow guiding wall 42c are connected to each other to form a continuous curved surface, so as to improve the air circulation efficiency between the air inlet 33 and the third air outlet 343. On the other hand, in the centrifugal fan 1h of Figure 19, the flow guiding portion 323b of the first flow guiding wall 32d and the flow guiding portion 423b of the second flow guiding wall 42d are connected to each other to form a continuous curved surface, and the flow guiding portion 324b of the first flow guiding wall 32d and the flow guiding portion 424b of the second flow guiding wall 42d are also connected to each other to form a continuous curved surface. The two curved surfaces are more, for example, oppositely arranged in the X-axis direction. Of course, the present case is not limited thereto, and details will not be described further.

[0107] In addition, in this embodiment, the second flow guiding pipe 352 is vertically connected to the side wall of the first flow guiding pipe 351a, and the fourth flow guiding pipe 354 is vertically connected to the third flow guiding pipe 353, wherein the second flow guiding pipe 352 and the fourth flow guiding pipe 354 face two opposite directions respectively. The second air outlet 342 and the fourth air outlet 344 more, for example, face two opposite directions respectively, so as to achieve the effect of stable air circulation. The present case is not limited thereto.

[0108] Figure 20 The three-dimensional structure diagram of the centrifugal fan for revealing the tenth preferred embodiment of the present case. In this embodiment, the centrifugal fan 1i is Figure 14 similar to the centrifugal fan 1g shown in Figures 1 to 18, and the same component reference numerals represent the same components, structures and functions, which will not be described further herein. In this embodiment, the centrifugal fan 1i further combines the pressurizing component 60 in the foregoing embodiment, and is detachably connected to the air inlet 33 on the first side surface 31 of the first fan frame 30i. By the arrangement of the pressurizing component 60, the centrifugal fan 1i further improves the air circulation efficiency between the air inlet 33 and the first air outlet 341, and details will not be described further herein.

[0109] Figure 21 The three-dimensional structure diagram of the centrifugal fan for revealing the eleventh preferred embodiment of the present case. Figures 22 and Figure 23The exploded view of the centrifugal fan according to the eleventh preferred embodiment of the present case is shown. In this embodiment, the centrifugal fan 1j is Figure 12A similar to the centrifugal fan 1e shown in FIGS. 12C, and the same component reference numerals represent the same components, structures and functions, which will not be described in detail herein. In this embodiment, in addition to the pressurizing assembly 60, the centrifugal fan 1j further includes a branch pipe 70 detachably connected to the first air outlet 341 on the first draft tube 351b, wherein the branch pipe 70 has a first branch air outlet 711 and a second branch air outlet 712, respectively communicating with the first air outlet 341. Since the branch pipe 70 is detachably connected to the first draft tube 351b, the branch pipe 70 can be selectively added to the centrifugal fan 1j according to actual application requirements, increasing the flow rate and direction change of the air flow driven by the centrifugal fan 1j. However, the present case is not limited thereto. On the other hand, in this embodiment, the first draft tube 351b is detachably connected to the first fan frame 30j for facilitating maintenance or replacement. Of course, the present case is not limited thereto.

[0110] Figure 24 The three-dimensional structure diagram of the centrifugal fan according to the twelfth preferred embodiment of the present case is shown. FIGS. 25 and Figure 26 The exploded view of the centrifugal fan according to the twelfth preferred embodiment of the present case is shown. In this embodiment, the centrifugal fan 1k is Figure 13 similar to the centrifugal fan 1f shown, and the same component reference numerals represent the same components, structures and functions, which will not be described in detail herein. In this embodiment, the centrifugal fan 1k further includes a partition plate 36, for example, disposed at the first air outlet 341a, forming a first air outlet 3411 and a second air outlet 3412, respectively communicating with the accommodation space 50 (refer to Figure 1 ), thereby stabilizing the air flow effect of the first air outlet 341a. On the other hand, the first draft tube 351c is detachably connected to the first fan frame 30k for facilitating maintenance or replacement. For example, the first draft tube 351c of the centrifugal fan 1k can be replaced with the first draft tube 351b of the centrifugal fan 1j in the foregoing embodiment or the branch pipe 70 of the centrifugal fan 1j can be added. Of course, the present case is not limited thereto.

[0111] Figure 27 The three-dimensional structure diagram of the centrifugal fan according to the thirteenth preferred embodiment of the present case is shown. FIGS. 28 and Figure 29To disclose an exploded view of the centrifugal fan of the thirteenth preferred embodiment of this case. In this embodiment, the centrifugal fan 1m is similar to the centrifugal fan 1j shown in FIGS. 21 to 23, and the same component numbers represent the same components, structures and functions, which will not be elaborated here. In this embodiment, the second fan frame 40e of the centrifugal fan 1m includes a fifth draft tube 441, a sixth draft tube 442, a fifth air outlet 431 and a sixth air outlet 432. The fifth draft tube 441 is detachably connected to the second side surface 41 of the second fan frame 40e. The fifth air outlet 431 is formed at one end of the fifth draft tube 441, and the sixth air outlet 432 is formed at one end of the sixth draft tube 442. In this embodiment, the fifth air outlet 431 of the second fan frame 40e and the first air outlet 341 of the first fan frame 30m are offset from each other. Thereby, the centrifugal fan 1m provides more different air circulation changes, increasing the practicability of the centrifugal fan 1m. In one embodiment, the fifth draft tube 441 is a square tube, but not limited thereto.

[0112] In summary, this case provides a centrifugal fan. By arranging the air inlet and the air outlet on the same side of the centrifugal fan, when the centrifugal fan is installed in a limited space such as in a vehicle, the installation space required for the centrifugal fan can be reduced, and at the same time, it is ensured that the centrifugal fan does not affect the air circulation efficiency due to the limitation of the installation space. Furthermore, when an external device such as a PM2.5 particle detection device is combined to monitor the air quality in the vehicle, the external device is conducive to simultaneously monitoring the air quality at the air inlet and the air outlet and knowing the difference therebetween. Its flow guide channel has cross-sectional areas of different sizes, which is beneficial to improving the air circulation efficiency between the air inlet and the air outlet. Gradually reducing the cross-sectional area along the direction of air flow in the centrifugal fan can increase the air circulation pressure and increase the flow rate. Furthermore, combined with the design that the rotation center of the impeller and the air inlet are offset from each other, it is more beneficial to improve the transmission efficiency of the centrifugal fan. The fan frame and the draft tube can be integrally formed or detachably connected to each other according to actual application requirements. Pressure components and branch pipes can be additionally provided at the air inlet and the air outlet to increase the practicability of the centrifugal fan, thereby enhancing the market competitiveness of the centrifugal fan.

[0113] This case can be modified by those skilled in this technology, but all are not beyond the scope of protection as claimed in the appended patent application.

Claims

1. A centrifugal fan, comprising: An impeller; A motor, connected to the impeller and configured to drive the impeller to rotate; and A first fan frame and a second fan frame, wherein the first fan frame includes a first side surface, a first guide wall, an air inlet, a first air outlet, a second air outlet, a first guide pipe and a second guide pipe, and the second fan frame includes a second side surface and a second guide wall, wherein the first side surface and the second side surface are opposite to each other, and are assembled with each other through the first guide wall and the second guide wall to jointly define an accommodation space and a guide channel, the accommodation space accommodates the impeller and the motor, and the guide channel communicates between the accommodation space and the first air outlet; Wherein the first guide pipe communicates between the accommodation space and the first air outlet, and the second guide pipe is disposed on the side wall of the first guide pipe to communicate with the second air outlet; Wherein the first air outlet is in the same direction as the axial direction of the air inlet and the impeller, and the second air outlet is in a different direction from the first air outlet; The cross-sectional area of the guide channel gradually decreases along the direction from the impeller to the at least one first air outlet; The second guide pipe is vertically connected to the side wall of the first guide pipe.

2. The centrifugal fan according to claim 1, wherein the first guide wall and the second guide wall correspond to each other in space and each includes a guide portion to jointly assemble the guide channel.

3. The centrifugal fan according to claim 1, wherein the first air outlet, the second air outlet and the air inlet are located on the same side of the centrifugal fan, and the air inlet, the first air outlet, the second air outlet are in the same direction as the axial direction of the impeller.

4. The centrifugal fan according to claim 1, wherein the impeller has a rotation center, and the air inlet has a center, and the rotation center and the center of the air inlet are offset from each other.

5. A centrifugal fan, comprising: An impeller; A motor, connected to the impeller and configured to drive the impeller to rotate; and A first fan frame and a second fan frame, wherein the first fan frame includes a first side surface, a first guide wall, an air inlet, a first air outlet, a second air outlet, a first guide pipe and a second guide pipe, and the second fan frame includes a second side surface and a second guide wall, wherein the first side surface and the second side surface are opposite to each other, and are assembled with each other through the first guide wall and the second guide wall to jointly define an accommodation space and a guide channel, the accommodation space accommodates the impeller and the motor, the guide channel communicates between the accommodation space and the first air outlet, and the guide channel has cross-sectional areas of different sizes; The cross-sectional area of the guide channel gradually decreases along the direction from the impeller to the at least one first air outlet; Wherein the first guide pipe communicates between the accommodation space and the first air outlet, and the second guide pipe is disposed on the side wall of the first guide pipe to communicate with the second air outlet; the second guide pipe is vertically connected to the side wall of the first guide pipe; Wherein the first air outlet is in the same direction as the axial direction of the air inlet and the impeller, and the second air outlet is in a different direction from the first air outlet.

6. The centrifugal fan as claimed in claim 5, wherein the second flow guiding wall and the first flow guiding wall correspond to each other spatially and each includes a pair of side walls, the pair of side walls face each other and the distance therebetween gradually decreases in the direction from the impeller to the first air outlet.

7. The centrifugal fan as claimed in claim 5, wherein the first flow guiding pipe has an inner pipe diameter that gradually decreases in the direction from the accommodating space to the first air outlet.

8. The centrifugal fan as claimed in claim 7, wherein the second flow guiding pipe has a uniform inner pipe diameter.

9. For the centrifugal fan as claimed in claim 8, the inner pipe diameter of the second flow guiding pipe is smaller than the inner pipe diameter of the first flow guiding pipe.

10. The centrifugal fan as claimed in claim 5, wherein the first flow guiding pipe includes a connecting end, and the connecting end has a gradually expanding guiding angle connected to the first side surface.

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