A cross-flow fan

Abstract

The utility model discloses a crossflow fan, which relates to the field of crossflow fans, including an air duct shell, an impeller and a shaded-pole motor; the shaded-pole motor is suspended and mounted on one end of the air duct shell based on a motor mounting seat, a first through hole and a plurality of second through holes are arranged in the motor mounting seat, and the plurality of second through holes are distributed around the first through hole array; the output end of the shaded-pole motor is connected to the impeller through the first through hole, one side of the plurality of second through holes faces the end of the impeller, and the other side faces the shaded-pole motor; a hollow window is arranged on the side of the motor mounting seat, one side of the hollow window faces the air inlet side of the impeller, and the other side faces the shaded-pole motor; a first opening is arranged on a side of the motor mounting seat close to the hollow window, and a second opening is arranged on a side of the motor mounting seat away from the hollow window. The utility model can form airflow inside and outside the air duct shell to directly cool the shaded-pole motor, and the cooling effect is excellent, which can significantly improve the service life of the shaded-pole motor.

Description

Technical Field

[0001] The utility model relates to the field of crossflow fans, in particular to a crossflow type fan. Background Art

[0002] A crossflow fan is mainly composed of three parts: an impeller, an air duct casing and an electric motor. When working, it inhales air or other gaseous media in a direction tangential to the impeller drive shaft, and then discharges it over a large area in the same tangential direction. Due to its large air volume and low cost, crossflow fans are widely used in household appliances.

[0003] When a cross-flow fan is working, its motor will inevitably generate heat; however, the existing cross-flow fan does not have a corresponding heat dissipation structure. When the motor works for a long time, heat accumulation is likely to occur, which will shorten the service life of the motor. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art. The utility model provides a cross-flow fan. By suspending a shaded-pole motor and arranging a first through hole, a second through hole, a hollow window, a first opening and a second opening, an airflow can be formed inside and outside the air duct shell to directly cool the shaded-pole motor. The cooling effect is excellent and the service life of the shaded-pole motor can be significantly improved.

[0005] The utility model provides a crossflow fan, which comprises an air duct shell, an impeller installed in the air duct shell, and a shaded-pole motor installed outside the air duct shell;

[0006] The shaded-pole motor is suspended on one end of the air duct shell based on the motor mounting seat, and the air duct shell part in the motor mounting seat is provided with a first through hole and a plurality of second through holes, and the plurality of second through holes are distributed around the first through hole array; the output end of the shaded-pole motor is connected to the impeller through the first through hole, one side of the plurality of second through holes faces the end of the impeller, and the other side of the plurality of second through holes faces the shaded-pole motor;

[0007] A hollow window is provided on the air duct shell portion beside the motor mounting seat, one side of the hollow window faces the air inlet side of the impeller, and the other side of the hollow window faces the shaded-pole motor; a first opening is provided on the side of the motor mounting seat close to the hollow window, and a second opening is provided on the side of the motor mounting seat away from the hollow window.

[0008] Specifically, the air duct housing includes a plastic volute housing and a plastic volute tongue, the two ends of the plastic volute housing are respectively provided with a first plastic side plate and a second plastic side plate, the plastic volute tongue is fixedly arranged between the first plastic side plate and the second plastic side plate, and the impeller is rotatably arranged between the first plastic side plate and the second plastic side plate;

[0009] The motor mounting seat is arranged on a surface of the first plastic side panel away from the second plastic side panel.

[0010] Specifically, a limiting groove group is provided on the inner wall of the motor mounting seat, and the inner contour of the limiting groove group is consistent with the outer contour of the bracket of the shaded-pole motor; and / or

[0011] The first plastic side panel is provided with a plurality of first reinforcing ribs along the longitudinal direction, the first plastic side panel is provided with a plurality of second reinforcing ribs along the transverse direction, and a plurality of first connecting ribs are provided between the surface of the motor mounting seat and the first plastic side panel.

[0012] Specifically, the plastic vortex tongue comprises a first guide plate and a second guide plate connected as one body, and an angle between the first guide plate and the second guide plate is less than 90°;

[0013] The first guide plate is located on a side close to the impeller, and the first guide plate and the impeller are tangent to each other in rotation direction; the second guide plate is located on a side away from the impeller, and the second guide plate and one side of the plastic volute form an air outlet.

[0014] Specifically, a plurality of second connecting ribs are provided between the first guide plate and the second guide plate; and / or

[0015] A plurality of buckle parts are formed on a side of the second guide plate away from the plastic volute shell, and a plurality of ear seats are formed on a side of the second guide plate away from the plastic volute shell.

[0016] Specifically, a connecting shaft is fixedly provided at one end of the impeller, a first elastic connecting seat is fixedly provided at the other end of the impeller, the connecting shaft and the second plastic side plate are rotatably connected, and the first elastic connecting seat and the output end of the shaded-pole motor are interference fit.

[0017] Specifically, a second elastic connecting seat is fixedly provided on the second plastic side plate, a ball bearing is embedded in the second elastic connecting seat, and the connecting shaft is inserted in the ball bearing.

[0018] Specifically, the output end of the shaded pole motor is sequentially provided with a first clamping groove and a dovetail groove in a direction away from the shaded pole motor body, the first elastic connecting seat is located between the first clamping groove and the dovetail groove, and the first clamping groove is provided with a clamping ring.

[0019] Specifically, a wire-releasing position is provided on the back of the plastic volute.

[0020] Specifically, the impeller is an aluminum alloy impeller; and / or

[0021] The blades of the impeller are arranged to be inclined from one end to the other end.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] In the cross-flow fan of the utility model, the shaded-pole motor is suspended at one end of the air duct shell based on the motor mounting base, that is, there is a gap between the shaded-pole motor and the air duct shell, and together with the first opening and the second opening, a channel for air flow can be formed; when the impeller rotates, on the one hand, the air flow driven by the end of the impeller will blow from the first through hole and the second through hole to the shaded-pole motor, which can take away the heat of the shaded-pole motor and cool the shaded-pole motor; on the other hand, the air on the air inlet side of the impeller is sucked in by the impeller, which will generate a negative pressure area, and the surrounding air will be supplemented into the negative pressure area to form a suction effect, and the shaded-pole Under the action of the suction effect, the air on the motor side will flow from the hollow window to the impeller, forming a flowing airflow, and will also take away the heat of the shaded-pole motor; moreover, the suction effect will also enhance the speed of the airflow blowing from the first through hole and the second through hole to the shaded-pole motor, which is conducive to taking away the heat of the shaded-pole motor more quickly; therefore, by suspending the shaded-pole motor and providing the first through hole, the second through hole, the hollow window, the first opening and the second opening, an airflow can be formed inside and outside the air duct shell to directly cool the shaded-pole motor, the cooling effect is excellent, and the service life of the shaded-pole motor can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a cross-flow fan in an embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a motor mounting base in an embodiment of the utility model;

[0027] Figure 3 It is a structural schematic diagram of a plastic volute in an embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the plastic vortex tongue in the embodiment of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the impeller in the embodiment of the utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the first elastic connecting seat in the embodiment of the utility model;

[0031] Figure 7 It is a schematic cross-sectional structure diagram of the second elastic connecting seat in the embodiment of the utility model;

[0032] Figure 8 It is a structural schematic diagram of a shaded-pole motor in an embodiment of the utility model.

[0033] In the attached drawings, 10, hollow window; 20, vortex tongue mounting groove; 30, ball bearing; 31, fourth slot; 32, impeller mounting blind hole; 40, motor mounting seat; 41, first through hole; 42, second through hole; 43, limit slot group; 44, fixing hole group; 45, first connecting rib; 100, air duct shell; 110, plastic vortex shell; 1101, second slot; 111, first plastic side panel; 1111, first reinforcing rib; 1112, second reinforcing rib; 112, second plastic side panel; 11 21. second elastic connection seat; 120. plastic vortex tongue; 121. first guide plate; 122. second guide plate; 123. triangular side plate; 124. second connection rib; 125. buckle portion; 126. ear seat; 127. claw; 200. impeller; 210. connecting shaft; 220. first elastic connection seat; 221. third slot; 222. clip rib; 300. shaded pole motor; 301. first slot; 302. dovetail slot; 310. stator; 320. rotor; 330. coil. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Figure 1 The schematic diagram of the structure of the crossflow fan in the embodiment of the utility model is shown, the crossflow fan comprises an air duct housing 100, an impeller 200 installed in the air duct housing 100 and a shaded-pole motor 300 installed outside the air duct housing 100, the shaded-pole motor 300 is suspended and mounted at one end of the air duct housing 100 based on a motor mounting base 40; Figure 2A schematic structural diagram of a motor mounting seat in an embodiment of the utility model is shown, wherein the air duct shell portion in the motor mounting seat 40 is provided with a first through hole 41 and a plurality of second through holes 42, and the plurality of second through holes 42 are distributed in an array around the first through hole 41; the output end of the shaded-pole motor 300 is connected to the impeller 200 through the first through hole 41, one side of the plurality of second through holes 42 faces the end of the impeller 200, and the other side of the plurality of second through holes 42 faces the shaded-pole motor 300; the air duct shell portion beside the motor mounting seat 40 is provided with a hollow window 10, one side of the hollow window 10 faces the air inlet side of the impeller 200, and the other side of the hollow window 10 faces the shaded-pole motor 300; the motor mounting seat 40 is provided with a first opening on a side close to the hollow window 10, and the motor mounting seat 40 is provided with a second opening on a side away from the hollow window 10.

[0036] In the cross-flow fan of the present invention, the shaded-pole motor 300 is suspended at one end of the air duct shell 100 based on the motor mounting base 40, that is, there is a gap between the shaded-pole motor 300 and the air duct shell 100, and together with the first opening and the second opening, a channel for air flow can be formed; when the impeller 200 rotates, on the one hand, the air flow driven by the end of the impeller will blow from the first through hole 41 and the second through hole 42 to the shaded-pole motor 300, which can take away the heat of the shaded-pole motor 300 and cool the shaded-pole motor 300; on the other hand, the air on the air inlet side of the impeller is sucked in by the impeller 200, which will produce a negative pressure area, and the surrounding air will be added to the negative pressure area to form a suction effect, and the shaded-pole Under the action of the suction effect, the air on the motor side will flow from the hollow window to the impeller 200, forming a flowing airflow, and will also take away the heat of the shaded-pole motor 300; moreover, the suction effect will also enhance the speed of the airflow blowing from the first through hole 41 and the second through hole 42 to the shaded-pole motor 300, which is conducive to taking away the heat of the shaded-pole motor 300 more quickly; therefore, by suspending the shaded-pole motor 300 and providing the first through hole 41, the second through hole 42, the hollow window 10, the first opening and the second opening, an airflow can be formed inside and outside the air duct shell 100 to directly cool the shaded-pole motor 300, and the cooling effect is excellent, which can significantly improve the service life of the shaded-pole motor 300.

[0037] Specifically, an end cover is provided at the end of the impeller 200, and a plurality of crescent-shaped through holes are opened on the end cover. The blades of the impeller 200 are respectively engaged in the crescent-shaped through holes, and the blades of the impeller 200 pass through the end cover, so that when the end of the impeller 200 rotates, more airflow can be generated to blow from the first through hole 41 and the second through hole 42 toward the shaded-pole motor 300.

[0038] Furthermore, when the blades of the impeller 200 are engaged in the crescent-shaped through holes, the blades do not fill up the space of the crescent-shaped through holes, and the airflow in the impeller 200 can flow out of the crescent-shaped through holes along the blades, thereby generating more airflow at the end of the impeller 200 .

[0039] In some specific embodiments, see Figure 1 , the air duct housing 100 includes a plastic volute housing 110 and a plastic volute tongue 120; Figure 3 1 shows a schematic diagram of the structure of the plastic volute in the embodiment of the utility model, wherein the two ends of the plastic volute 110 are respectively provided with a first plastic side plate 111 and a second plastic side plate 112; Figure 1 and Figure 3 The plastic vortex tongue 120 is fixedly arranged between the first plastic side panel 111 and the second plastic side panel 112, and the impeller 200 is rotatably arranged between the first plastic side panel 111 and the second plastic side panel 112; the motor mounting seat 40 is arranged on a surface of the first plastic side panel 111 away from the second plastic side panel 112.

[0040] The air duct shell 100 is made of plastic as a whole. Plastic is cheaper than metal and other materials, which reduces the material cost of the cross-flow fan. Moreover, the molding process of plastic is relatively simple and the molding speed is fast, which is beneficial to reducing the manufacturing cost of the cross-flow fan. In addition, the air duct shell 100 made of plastic is light in weight, which can reduce transportation costs and also contributes to the reduction of the overall weight of the cross-flow fan.

[0041] In some specific embodiments, see Figure 2 A plurality of blocking strips are arranged at intervals in the hollow window 10 to prevent large debris from entering the air duct housing 100 through the hollow window 10, thereby protecting the impeller 200.

[0042] In some specific embodiments, see Figure 2 A limiting groove group 43 is provided on the inner wall of the motor mounting seat 40, and the inner contour of the limiting groove group 43 is consistent with the outer contour of the bracket of the shaded-pole motor 300. The bracket of the shaded-pole motor 300 can be stably inserted in the limiting groove group 43, which not only facilitates the positioning and installation of the shaded-pole motor 300, but also helps to improve the installation stability of the shaded-pole motor 300.

[0043] For details, please refer to Figure 2 The motor mounting seat 40 is provided with a plurality of fixing hole groups 44 , and the plurality of fixing hole groups 44 are used to cooperate with screws to fix the stator of the shaded-pole motor 300 , thereby firmly fixing the shaded-pole motor 300 on the motor mounting seat 40 .

[0044] For further information, see Figure 2The first plastic side panel 111 is provided with a plurality of first reinforcing ribs 1111 along the longitudinal direction, the first plastic side panel 112 is provided with a plurality of second reinforcing ribs 1112 along the transverse direction, and a plurality of first connecting ribs 45 are provided between the surface of the motor mounting seat 40 and the first plastic side panel 111; the first reinforcing ribs 1111 and the second reinforcing ribs 1112 can increase the strength of the first plastic side panel 111, and the first connecting ribs 45 can increase the connection stability between the motor mounting seat 40 and the first plastic side panel 111, thereby facilitating the reduction of vibration of the shaded-pole motor 300 during operation.

[0045] Figure 4 The schematic diagram of the structure of the plastic vortex tongue in the embodiment of the utility model is shown. The plastic vortex tongue 120 includes a first guide plate 121 and a second guide plate 122 connected as one body. The angle between the first guide plate 121 and the second guide plate 122 is less than 90°; the first guide plate 121 is located on the side close to the impeller 200, and the first guide plate 121 and the rotation direction of the impeller 200 are tangent; the second guide plate 122 is located on the side away from the impeller 200, and the second guide plate 122 and one side of the plastic volute 110 form an air outlet. The vortex tongue, as the turning boundary between the air inlet side and the air outlet side of the crossflow fan, has an important influence on the internal flow characteristics of the crossflow fan. The first guide plate 121 and the second guide plate 122 cooperate with each other, which can effectively reduce the operating noise of the crossflow fan and increase the air volume of the crossflow fan.

[0046] The two ends of the plastic vortex tongue 120 are provided with triangular side panels 123, and the triangular side panels 123, the first guide plate 121 and the second guide plate 122 are integrally formed, which can improve the structural stability of the plastic vortex tongue 120, thereby reducing the vibration of the plastic vortex tongue 120 during operation; the first plastic side panel 111 and the second plastic side panel 112 are both provided with vortex tongue mounting grooves 20, and the triangular side panels 123 are snap-fitted into the vortex tongue mounting grooves 20, which can effectively improve the installation stability of the plastic vortex tongue 120, thereby reducing the vibration of the plastic vortex tongue 120 during operation; the two ends of the plastic vortex tongue 120 are fixedly connected to the first plastic side panel 111 and the second plastic side panel 112 by screws, which further improves the installation stability of the plastic vortex tongue 120, and the plastic vortex tongue 120 supports the first plastic side panel 111 and the second plastic side panel 112, which is beneficial to improving the overall structural stability of the air duct shell 100, thereby reducing the vibration of the air duct shell 100 during operation.

[0047] For further information, see Figure 4A plurality of second connecting ribs 124 are provided between the first guide plate 121 and the second guide plate 122 , which can further enhance the connection stability between the first guide plate 121 and the second guide plate 122 , thereby reducing the vibration of the plastic vortex tongue 120 .

[0048] In some specific embodiments, see Figure 4 A plurality of snap-fit ​​portions 125 are formed on a side of the second guide plate 122 away from the plastic volute 110 for snapping with a corresponding housing to facilitate installation of the cross-flow blower.

[0049] For details, please refer to Figure 4 A plurality of ear seats 126 are formed on the side of the second guide plate 122 away from the plastic volute 110 for screw connection with the corresponding housing, which is beneficial to improving the installation stability of the cross-flow fan.

[0050] For further information, see Figure 3 and Figure 4 The second guide plate 122 is formed with a plurality of claws 127 on the side away from the plastic volute 110, and the air outlet side of the plastic volute 110 is formed with a second slot 1101, which facilitates the precise alignment of the cross-flow fan with the corresponding shell and ensures that the air outlet of the cross-flow fan is installed in place.

[0051] Figure 5 2 shows a schematic diagram of the structure of the impeller in the embodiment of the utility model. A connecting shaft 210 is fixedly disposed at one end of the impeller 200, and a first elastic connecting seat 220 is fixedly disposed at the other end of the impeller 200; see Figure 1 and Figure 5 The connecting shaft 210 and the second plastic side plate 112 are rotatably connected, and the first elastic connecting seat 220 and the output end of the shaded-pole motor 300 are interference-fitted, which can effectively reduce the difficulty of installing the impeller 200 .

[0052] Figure 6 A schematic structural diagram of the first elastic connection seat in an embodiment of the utility model is shown, a third slot 221 and a plurality of retaining ribs 222 are formed on the outer side of the first elastic connection seat 220, the impeller 200 is clamped in the third slot 221, and the plurality of retaining ribs 222 are used to prevent relative rotation between the impeller 200 and the first elastic connection seat 220; a motor shaft mounting through hole is formed inside the first elastic connection seat 220, and the output end of the shaded-pole motor 300 is interference fit in the motor shaft mounting through hole.

[0053] Specifically, a second elastic connecting seat 1121 is fixedly disposed on the second plastic side plate 112. Figure 7A schematic diagram of the cross-sectional structure of the second elastic connecting seat in the embodiment of the utility model is shown, wherein the second elastic connecting seat 1121 is embedded with a ball bearing 30, and the connecting shaft 210 is inserted in the ball bearing 30, so that the impeller 200 rotates more smoothly, which is beneficial to reducing the noise when the impeller 200 rotates; the first elastic connecting seat 220 and the second elastic connecting seat 1121 cooperate with each other, which can not only further reduce the difficulty of installing the impeller 200, but also effectively reduce the vibration of the impeller 200 during operation, thereby reducing the noise when the impeller 200 is working.

[0054] See also Figure 7 A fourth slot 31 is formed on the outer side of the second elastic connecting seat 1121, and the second plastic side panel 112 is snapped into the fourth slot 31; an impeller mounting blind hole 32 is formed inside the second elastic connecting seat 1121, and the ball bearing 30 is embedded in the impeller mounting blind hole 32, which can prevent dust and other impurities from interfering with the roller bearing.

[0055] The first elastic connection seat 220 and the second elastic connection seat 1121 are both made of silicone rubber, which has good elasticity, and is strong and durable.

[0056] Figure 8 A schematic diagram of the structure of a shaded-pole motor in an embodiment of the utility model is shown, wherein the output end of the shaded-pole motor 300 is sequentially provided with a first slot 301 and a dovetail slot 302 in a direction away from the main body of the shaded-pole motor 300, the first elastic connecting seat 220 is located between the first slot 301 and the dovetail slot 302, and the first slot 301 is provided with a snap ring; the snap ring cooperates with the dovetail slot 302 to restrict the first elastic connecting seat 220 to the output end of the shaded-pole motor 300, thereby preventing the first elastic connecting seat 220 from detaching from the output end of the shaded-pole motor 300 and ensuring the connection stability between the shaded-pole motor 300 and the impeller 200.

[0057] In some specific embodiments, a wire placement position is provided on the back of the plastic volute 110 to store the wires of the shaded-pole motor 300 to prevent the wires from being scattered.

[0058] In some specific embodiments, the impeller 200 is an aluminum alloy impeller, which is relatively light and has good strength.

[0059] In some specific embodiments, see Figure 5 The blades of the impeller 200 are tilted from one end to the other, that is, the blades of the impeller 200 are arranged at a certain angle to the central axis of the impeller 200, which has good aerodynamic performance, can reduce energy consumption, noise, etc., and is conducive to improving mechanical efficiency.

[0060] Typically, see Figure 8The shaded-pole motor 300 includes a stator 310, a rotor 320 and a coil 330. The rotor 320 is rotatably arranged in the stator 310 based on a bracket, and the coil 330 is passed through the stator 310 based on a wire skeleton; wherein the size of the stator 310 is 48*50mm, which is small in size and occupies a small space, making it easy to install the shaded-pole motor 300 on the air duct housing 100.

[0061] The cross-flow fan of the utility model, by suspending the shaded-pole motor 300, and providing the first through hole 41, the second through hole 42, the hollow window, the first opening and the second opening, can form airflow inside and outside the air duct shell to directly cool the shaded-pole motor 300, the cooling effect is excellent, and the service life of the shaded-pole motor 300 can be significantly improved; the air duct shell 100 is made of plastic as a whole, which reduces the cost and weight; the motor mounting seat 40 is used to install the shaded-pole motor 300 through the limiting groove group 43 and the fixing hole group 44, which not only improves the installation convenience of the shaded-pole motor 300, but also ensures the installation stability of the shaded-pole motor 300; the first reinforcing rib 1111 and the second reinforcing rib 1112 can increase the strength of the first plastic side plate 111; the first connecting rib 45 can increase the connection stability between the motor mounting seat 40 and the first plastic side plate 111, so as to reduce the vibration of the shaded-pole motor 300 during operation; the first guide plate 111 of the plastic vortex tongue 120 21 and the second guide plate 122 cooperate with each other at a special angle, which can effectively reduce the operating noise of the cross-flow fan and increase the air volume of the cross-flow fan; the triangular side plate 123 of the plastic vortex tongue 120 is conducive to improving the structural stability and installation stability, and the second connecting rib 124 is also conducive to improving the structural stability of the plastic vortex tongue 120. The buckle part 125, the ear seat 126, the claw 127, etc. are conducive to improving the installation convenience and stability of the cross-flow fan, thereby helping to improve the overall structural stability and installation stability of the air duct shell 100, and can reduce the vibration of the air duct shell 100 during operation; the shaded pole motor 300 is connected to the impeller 200 through the first elastic connecting seat 220, and the impeller 200 is connected through the connecting shaft 210 and the ball bearing 30 in the second elastic connecting seat 1121, which can not only reduce the installation difficulty of the impeller 200, but also effectively reduce the vibration of the impeller 200 during operation, thereby reducing the noise of the impeller 200 during operation.

[0062] The cross-flow fan of the utility model can run with low noise, is stable and reliable, is easy to install, has low use cost and long service life.

[0063] The above is a detailed introduction to a cross-flow blower provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principle and implementation method of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A crossflow fan, characterized in that: The crossflow fan comprises an air duct shell, an impeller installed in the air duct shell, and a shaded-pole motor installed outside the air duct shell; The shaded-pole motor is suspended on one end of the air duct shell based on the motor mounting seat, and the air duct shell part in the motor mounting seat is provided with a first through hole and a plurality of second through holes, and the plurality of second through holes are distributed around the first through hole array; the output end of the shaded-pole motor is connected to the impeller through the first through hole, one side of the plurality of second through holes faces the end of the impeller, and the other side of the plurality of second through holes faces the shaded-pole motor; A hollow window is provided on the air duct shell portion beside the motor mounting seat, one side of the hollow window faces the air inlet side of the impeller, and the other side of the hollow window faces the shaded-pole motor; a first opening is provided on the side of the motor mounting seat close to the hollow window, and a second opening is provided on the side of the motor mounting seat away from the hollow window.

2. The crossflow fan according to claim 1, characterized in that: The air duct housing comprises a plastic volute housing and a plastic volute tongue, the two ends of the plastic volute housing are respectively provided with a first plastic side plate and a second plastic side plate, the plastic volute tongue is fixedly arranged between the first plastic side plate and the second plastic side plate, and the impeller is rotatably arranged between the first plastic side plate and the second plastic side plate; The motor mounting seat is arranged on a surface of the first plastic side panel away from the second plastic side panel.

3. The crossflow fan according to claim 2, characterized in that: A limiting groove group is provided on the inner wall of the motor mounting seat, and the inner contour of the limiting groove group is consistent with the outer contour of the bracket of the shaded-pole motor; and / or The first plastic side panel is provided with a plurality of first reinforcing ribs along the longitudinal direction, the first plastic side panel is provided with a plurality of second reinforcing ribs along the transverse direction, and a plurality of first connecting ribs are provided between the surface of the motor mounting seat and the first plastic side panel.

4. The crossflow fan according to claim 2, characterized in that: The plastic vortex tongue comprises a first guide plate and a second guide plate connected as one body, and the angle between the first guide plate and the second guide plate is less than 90°; The first guide plate is located on a side close to the impeller, and the first guide plate and the impeller are tangent to each other in rotation direction; the second guide plate is located on a side away from the impeller, and the second guide plate and one side of the plastic volute form an air outlet.

5. The crossflow fan according to claim 4, characterized in that: A plurality of second connecting ribs are provided between the first guide plate and the second guide plate; and / or A plurality of buckle parts are formed on a side of the second guide plate away from the plastic volute shell, and a plurality of ear seats are formed on a side of the second guide plate away from the plastic volute shell.

6. The crossflow fan according to claim 2, characterized in that: A connecting shaft is fixedly provided at one end of the impeller, and a first elastic connecting seat is fixedly provided at the other end of the impeller. The connecting shaft is rotatably connected to the second plastic side plate, and the first elastic connecting seat is interference fit with the output end of the shaded-pole motor.

7. The crossflow fan according to claim 6, characterized in that: A second elastic connection seat is fixedly provided on the second plastic side plate, a ball bearing is embedded in the second elastic connection seat, and the connection shaft is inserted in the ball bearing.

8. The crossflow fan according to claim 6, characterized in that: The output end of the shaded-pole motor is provided with a first clamping groove and a dovetail groove in sequence along a direction away from the shaded-pole motor body, the first elastic connecting seat is located between the first clamping groove and the dovetail groove, and the first clamping groove is provided with a clamping ring.

9. The crossflow fan according to claim 2, characterized in that: A wire-releasing position is arranged on the back of the plastic volute.

10. The crossflow fan according to claim 1, wherein: The impeller is an aluminum alloy impeller; and / or The blades of the impeller are arranged to be inclined from one end to the other end.

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