Suction-blast fan motor

Abstract

The application discloses a suction-blowing fan motor and relates to the technical field of motors. The suction-blowing fan motor comprises a motor body, a fan, a fan cover and a first gas flow channel, and the first gas flow channel is provided with a first flow channel opening and a second flow channel opening at two ends, respectively. When the suction-blowing fan motor is in a suction state, the fan rotates forward, and the gas flows along the direction from the first flow channel opening to the second flow channel opening. When the suction-blowing fan motor is in a blowing state, the fan rotates reversely, and the gas flows along the direction from the second flow channel opening to the first flow channel opening. The suction-blowing fan motor can drive the airflow to flow reversely along the direction from the second flow channel opening to the first flow channel opening when the fan reversely rotates, so that the dust in the first gas flow channel can be cleaned, the dust accumulated on the fan blades can be effectively removed, the working efficiency of the fan motor can be improved, and the fan can be prevented from being stuck.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a suction fan motor. Background Technology

[0002] A fan motor is an electric motor used to create air circulation between the inside and outside of a device, and it is commonly used in vacuum cleaners, hair dryers, and other similar applications. Existing fan motors include a motor body and a fan mounted on the motor body. The motor body drives the fan to rotate in the forward direction to achieve airflow.

[0003] However, during the use of a fan motor, dust easily accumulates on the leading edge of the fan blades. This not only reduces the efficiency of the fan motor but also causes it to overheat, greatly shortening its lifespan. At the same time, the dust accumulated on the blades reduces the gap between the fan and the shroud, making the fan prone to jamming, which seriously affects the normal operation of the fan motor. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this application provides a suction fan motor that can clean the dust accumulated on the leading edge of the fan blades.

[0005] The suction fan motor provided in this application adopts the following technical solution:

[0006] A suction fan motor includes a motor body, a fan disposed on the motor body, and a shroud covering the fan. A first gas flow channel is formed between the fan and the shroud, and the two ends of the first gas flow channel have a first flow channel opening and a second flow channel opening, respectively.

[0007] The suction and blowing fan motor has a suction state and a blowing state. When the fan rotates in the forward direction, the suction and blowing fan motor is in the suction state, and the gas flows along the direction from the first flow channel opening to the second flow channel opening. When the fan rotates in the reverse direction, the suction and blowing fan motor is in the blowing state, and the gas flows along the direction from the second flow channel opening to the first flow channel opening.

[0008] By adopting the above technical solution, the fan can drive the airflow to flow in the opposite direction from the second flow channel opening to the first flow channel opening when rotating in the reverse direction, so as to clean the dust in the first gas flow channel. This can effectively eliminate the dust accumulated on the fan blades, which can not only improve the working efficiency of the fan motor, but also prevent the fan from jamming.

[0009] Preferably, the motor body is provided with a rotating shaft, and the fan includes a hub coaxially sleeved on the rotating shaft and a plurality of fan blades spaced apart on the periphery of the hub. The plurality of fan blades each have a projection on the radial plane of the hub, and the plurality of projections are arranged to overlap each other.

[0010] By adopting the above technical solution, multiple fan blades can guide the air to flow in the opposite direction when the fan rotates in the opposite direction, so as to clean the dust on the fan blades.

[0011] Preferably, each pair of adjacent fan blades overlaps to form an overlapping portion, the length of the overlapping portion is L1, the chord length of the fan blade is L2, and 3L1≥2L2.

[0012] By adopting the above technical solution, the guiding effect of multiple fan blades on the reverse flow of gas has been further improved.

[0013] Preferably, the sidewall of the hub has a first tangent extending from one end to the other, the angle between the first tangent and the axis of rotation of the shaft is A1, and the angle of A1 is in the range of 0~25°; the end of the fan blade away from the hub has a first blade tip, the first blade tip has a second tangent extending from one end of the hub to the other, the angle between the second tangent and the axis of rotation of the shaft is A2, and the angle of A2 is in the range of 0~20°.

[0014] By adopting the above technical solution, the gas can flow smoothly in both the forward and reverse directions within the first gas channel, enabling the fan motor to flexibly switch between the intake and exhaust states.

[0015] Preferably, when the suction fan motor is in the suction state, the gas enters the first gas channel from the first flow channel opening, the gas has a first direction of movement at the first flow channel opening, and the angle between the first direction of movement and the extension direction of the second tangent is i1, the angle range of i1 is 3~15°.

[0016] By adopting the above technical solution, gas can smoothly enter the first gas flow channel from the first flow channel opening when the fan is rotating in the forward direction, so that the fan motor can be in the intake state continuously.

[0017] Preferably, when the suction fan motor is in the blowing state, the gas enters the first gas channel from the second flow channel opening, the gas has a second movement direction at the second flow channel opening, and the angle between the second movement direction and the extension direction of the second tangent is i2, the angle range of i2 is 5~15°.

[0018] By adopting the above technical solution, gas can smoothly enter the first gas channel from the second flow channel opening when the fan rotates in the opposite direction, so that the fan motor can be in a continuous blowing state.

[0019] Preferably, the inner wall of the shroud has a third tangent extending from one end to the other, the distance between the third tangent and the second tangent is δ, and the length of δ ranges from 0.1 to 1.0 mm.

[0020] By adopting the above technical solution, the gas loss of the fan during forward and reverse rotation is reduced, effectively improving the working efficiency of the fan motor.

[0021] Preferably, the suction fan motor further includes a fixed impeller disposed between the fan and the motor body, and a wheel cover disposed on the fixed impeller, wherein a second gas flow channel is formed between the fixed impeller and the wheel cover, and the second gas flow channel is connected to the first gas flow channel.

[0022] Preferably, the circumferential side of the fixed impeller is provided with a plurality of impeller ribs at intervals, the impeller ribs are housed in the second gas flow channel, the number of the plurality of impeller ribs is M, the number of the fan blades is N, M=N+n, where n is a positive integer less than 4.

[0023] By adopting the above technical solution, the interference between the dynamic and static flow fields between the first gas flow channel and the second gas flow channel is effectively reduced, thereby reducing the airflow pressure pulsation between the first gas flow channel and the second gas flow channel, and thus effectively reducing gas vortex noise.

[0024] Preferably, the impeller rib has a second blade tip at the end away from the fixed impeller, the second blade tip has a fourth tangent extending along the direction from one end of the fixed impeller to the other end, the rotating shaft is coaxially inserted in the fixed impeller and rotatably connected to the fixed impeller, the angle between the fourth tangent and the axis of the rotating shaft is f, and the angle range of f is 0~5°.

[0025] By adopting the above technical solution, the resistance of gas entering the second gas flow channel is effectively reduced. When the fan rotates in the opposite direction, the gas can smoothly enter the second gas flow channel, improving the cleaning effect of the gas on dust.

[0026] In summary, the present invention has at least one of the following beneficial technical effects:

[0027] When the fan rotates in the reverse direction, it can drive the airflow to flow in the opposite direction from the second flow channel to the first flow channel to clean the dust in the first gas flow channel. This can effectively remove the dust accumulated on the fan blades, which can not only improve the working efficiency of the fan motor, but also prevent the fan from jamming. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the axial cross-section of the suction fan motor in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the fan structure in an embodiment of this application;

[0030] Figure 3 This is a simulated line graph showing the relationship between angle A1 and gas flow rate in the first gas channel in the embodiments of this application;

[0031] Figure 4 This is a simulated line graph showing the relationship between angle A2 and gas flow rate in the first gas channel in the embodiments of this application.

[0032] Marked in the attached diagram:

[0033] 1. Motor body; 11. Rear cover; 12. PCB board; 13. Iron core; 14. Magnet; 15. Balance ring; 16. Bearing; 2. Fan; 21. Hub; 22. Fan blade; 23. First blade tip; 24. Guide section; 3. Fan cover; 31. Chamfer; 4. First gas flow channel; 41. First flow channel opening; 42. Second flow channel opening; 5. Rotating shaft; 6. Fixed impeller; 7. Impeller cover; 8. Second gas flow channel; 9. Impeller ribs; 91. Second blade tip;

[0034] 100. First tangent; 101. Axis line; 102. Second tangent; 103. First direction of motion; 104. Second direction of motion; 105. Third tangent; 106. Fourth tangent. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in further detail below.

[0036] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0037] See Figure 1 As shown, a blower motor is provided, including a motor body 1, a fan 2 disposed on the motor body 1, and a fan cover 3 disposed on the fan 2. The fan 2 is rotatably connected to the motor body 1, and the fan cover 3 is fixedly connected to the motor body 1.

[0038] The motor body 1 has a rotating shaft 5 coaxially mounted on it, and the fan 2 is coaxially sleeved on the end of the rotating shaft 5. The motor body 1 can drive the rotating shaft 5 to rotate. The fan 2 includes a hub 21 coaxially sleeved on the rotating shaft 5 and a plurality of fan blades 22 spaced apart on the periphery of the hub 21. A first gas flow channel 4 is formed between the fan 2 and the fan cover 3. The first gas flow channel 4 has a first flow channel opening 41 and a second flow channel opening 42 at both ends.

[0039] The suction and blowing fan motor of this application has a suction state and a blowing state. When the fan 2 rotates in the forward direction, the suction and blowing fan motor is in the suction state, and the gas flows along the direction from the first flow channel 41 to the second flow channel 42. When the fan 2 rotates in the reverse direction, the suction and blowing fan motor is in the blowing state, and the gas flows along the direction from the second flow channel 42 to the first flow channel 41.

[0040] In this way, when fan 2 rotates in the forward direction, the gas flows forward along the direction from the first flow channel opening 41 to the second flow channel opening 42, enabling the suction fan motor of this application to be used in a vacuum cleaner and complete the vacuuming operation. When fan 2 rotates in the reverse direction, the airflow flows in the reverse direction along the direction from the second flow channel opening 42 to the first flow channel opening 41. During the reverse flow, the gas can clean the dust in the first gas flow channel 4, thereby effectively eliminating the dust accumulated on the fan blades 22 of fan 2. After the dust is removed, the working efficiency of the suction fan motor can be effectively improved without generating serious heat, thus extending the service life of the suction fan motor. At the same time, it can also prevent fan 2 from jamming, allowing the suction fan motor to continuously operate normally.

[0041] In this embodiment, the motor body 1 includes a rear cover plate 11, on which an electrically connected PCB board 12 and an iron core 13 are disposed. The iron core 13 is annular and contains a magnet 14. The magnet 14 is sleeved on the rotating shaft 5. After the PCB board 12 is powered on, the magnet 14 can rotate relative to the iron core 13 and drive the rotating shaft 5 to rotate in the forward or reverse direction. The specific driving principle is existing technology and will not be described in detail here. The fan 2 is disposed at the front end of the rotating shaft 5, and a balance ring 15 is disposed at the rear end of the rotating shaft 5.

[0042] In this embodiment, combined with Figure 2 As shown, multiple fan blades 22 surround the circumferential side of the hub 21. These fan blades 22 each have a projection on the radial plane of the hub 21, and the multiple projections are arranged to overlap each other. Each pair of adjacent fan blades 22 overlaps to form an overlapping portion, the length of which is L1, and the chord length of the fan blade 22 is L2, where 3L1 ≥ 2L2. In this way, the overlap between adjacent fan blades 22 can exceed two-thirds of the chord length of the fan blade 22, allowing the multiple fan blades 22 to guide the gas to flow in the opposite direction when the fan 2 rotates in the opposite direction, thereby cleaning the dust on the fan blades 22.

[0043] In this embodiment, combined again Figure 1 As shown, the sidewall of the hub 21 has a first tangent 100 extending from one end to the other, and the angle between the first tangent 100 and the axis 101 of the shaft 5 is A1, with the angle ranging from 0 to 25°; the end of the fan blade 22 away from the hub 21 has a first blade tip 23, and the first blade tip 23 has a second tangent 102 extending from one end to the other of the hub 21, and the angle between the second tangent 102 and the axis 101 of the shaft 5 is A2, with the angle ranging from 0 to 20°.

[0044] Combination Figure 3-4 As shown, based on simulation results, setting the angle of A1 to 0~25° and the angle of A2 to 0~20° allows for smooth forward and reverse flow of gas within the first gas channel, enabling the fan motor to flexibly switch between intake and exhaust states. When fan 2 rotates forward, gas flows smoothly from the first flow channel opening 41 to the second flow channel opening 42 to complete intake; while when fan 2 rotates in reverse, gas flows smoothly from the second flow channel opening 42 to the first flow channel opening 41 to complete exhaust.

[0045] In this embodiment, combined again Figure 1 As shown, when the suction fan motor is in the suction state, gas enters the first gas flow channel 4 from the first flow channel opening 41. The gas has a first motion direction 103 at the first flow channel opening 41. The angle between the first motion direction 103 and the extension direction of the second tangent 102 is i1, and the angle range of i1 is 3~15°. Here, i1 is defined as the forward airflow angle. Based on the simulation results, the forward airflow angle within the above range can ensure that the gas smoothly enters the first gas flow channel 4 from the first flow channel opening 41 when the fan 2 rotates in the forward direction, so that the fan motor can be continuously in the suction state.

[0046] When the blower fan motor is in blowing mode, gas enters the first gas channel 4 from the second flow channel opening 42. The gas has a second movement direction 104 at the second flow channel opening 42. The angle between the second movement direction 104 and the extension direction of the second tangent 102 is i2, and the angle range of i2 is 5~15°. Here, i2 is defined as the reverse airflow angle. Based on the simulation results, the reverse airflow angle within the above range can ensure that the gas smoothly enters the first gas channel 4 from the second flow channel opening 42 when the fan 2 rotates in the reverse direction, so that the fan motor can be continuously in blowing mode.

[0047] In this embodiment, the inner wall of the fan shroud 3 has a third tangent 105 extending from one end to the other. The distance between the third tangent 105 and the second tangent 102 is δ, and the length of δ ranges from 0.1 to 1.0 mm. δ that meets the above range can reduce the gas loss of the fan 2 when rotating in the forward and reverse directions, effectively improving the working efficiency of the fan motor.

[0048] In this embodiment, the suction fan motor also includes a fixed impeller 6 disposed between the fan 2 and the motor body 1, and a wheel cover 7 covering the fixed impeller 6. The fixed impeller 6 and the wheel cover 7 are both fixedly connected to the motor body 1. A bearing 16 is internally connected in the fixed impeller 6, and the rotating shaft 5 is coaxially inserted in the bearing 16 and rotatably connected to the bearing 16.

[0049] A second gas flow channel 8 is formed between the fixed impeller 6 and the impeller cover 7. The second gas flow channel 8 is connected to the first gas flow channel 4. Multiple impeller ribs 9 are equidistantly arranged on the circumference of the fixed impeller 6, and the impeller ribs 9 are housed in the second gas flow channel 8. The number of impeller ribs 9 is M, and the number of fan blades 22 is N, where M = N + n, and n is a positive integer less than 4. Specifically, n can be 1, 2, or 3.

[0050] In this way, by setting the number of impeller ribs 9 and fan blades 22, the interference between the dynamic and static flow fields between the first gas flow channel 4 and the second gas flow channel 8 can be effectively reduced, thereby reducing the airflow pressure pulsation between the first gas flow channel 4 and the second gas flow channel 8, and thus effectively reducing gas vortex noise.

[0051] In this embodiment, the end of the impeller rib 9 furthest from the fixed impeller 6 has a second blade tip 91, which is fixed to the inner wall of the wheel cover. The second blade tip 91 has a fourth tangent 106 extending along one end of the fixed impeller 6 to the other end. The angle between the fourth tangent 106 and the axis 101 of the rotating shaft 5 is f, and the angle range of f is 0~5°. Here, f is defined as the outlet angle of the fixed impeller 6. An outlet angle within the above range can effectively reduce the resistance of gas entering the second gas flow channel 8. When the fan 2 rotates in the reverse direction, the gas can smoothly enter the second gas flow channel 8 and then enter the first gas flow channel 4 from the second gas flow channel 8, effectively improving the cleaning effect of the gas on dust.

[0052] In this embodiment, the end of the hub 21 near the first flow channel opening 41 has an arc-shaped guide portion 24. The arc-shaped guide portion 24 can introduce gas more smoothly into the first gas flow channel 4, reduce wind resistance, and thus improve the working capacity of the fan 2.

[0053] In this embodiment, the inner wall of the fan shroud 3 near the first flow channel opening 41 has an arc-shaped chamfer 31. When the fan 2 rotates forward, the fan shroud 3 with the arc-shaped chamfer 31 can collect more airflow and reduce intake vortex loss, thereby reducing intake noise. When the fan 2 rotates in reverse, the fan shroud 3 with the arc-shaped chamfer 31 can diffuse and enhance the exhaust airflow and reduce the gas velocity, thereby reducing exhaust noise.

[0054] The implementation principle of the suction fan motor in this application embodiment is as follows:

[0055] When the motor body 1 is connected to the power supply, the rotating shaft 5 drives the fan 2 to rotate in the forward direction. At this time, the fan motor is in the suction state. The gas enters the first gas flow channel 4 from the first flow channel port 41, then enters the second gas flow channel 8 through the second flow channel port 42, and finally exits from the rear end of the second gas flow channel 8.

[0056] The rotating shaft 5 drives the fan 2 to rotate in the opposite direction. The fan motor is in the blowing state. The gas enters the second flow channel port 42 from the rear end of the second gas flow channel 8, then enters the first gas flow channel 4 through the second flow channel port 42, and finally carries the dust out from the first flow channel port 41.

[0057] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A blow fan motor comprising a motor body (1), a fan (2) provided on the motor body (1), a fan cover (3) provided on the fan (2), characterized in that: The fan (2) and the shroud (3) form a first gas flow channel (4), and the first gas flow channel (4) has a first flow channel opening (41) and a second flow channel opening (42) at both ends respectively; The suction-blow fan motor has a suction state and a blow state, when the fan (2) rotates forward, the suction-blow fan motor is in the suction state, and the gas flows along the direction from the first flow channel opening (41) to the second flow channel opening (42); when the fan (2) rotates reversely, the suction-blow fan motor is in the blow state, and the gas flows along the direction from the second flow channel opening (42) to the first flow channel opening (41); The motor body (1) is provided with a rotating shaft (5), and the fan (2) comprises a hub (21) coaxially sleeved on the rotating shaft (5) and a plurality of fan blades (22) arranged at intervals on the circumferential side of the hub (21). The side wall of the hub (21) has a first tangent line (100) extending along the direction from one end to the other end, the included angle between the first tangent line (100) and the axis line (101) of the rotating shaft (5) is A1, and the angle range of A1 is 0-25°; one end of the fan blade (22) away from the hub (21) has a first blade tip (23), and the first blade tip (23) has a second tangent line (102) extending along the direction from one end to the other end of the hub (21), the included angle between the second tangent line (102) and the axis line (101) of the rotating shaft (5) is A2, and the angle range of A2 is 0-20°; When the suction-blow fan motor is in the suction state, the gas enters the first gas flow channel (4) from the first flow channel opening (41), the gas has a first movement direction (103) at the first flow channel opening (41), the included angle between the first movement direction (103) and the extension direction of the second tangent line (102) is i1, and the angle range of i1 is 3-15°; When the suction-blow fan motor is in the blow state, the gas enters the first gas flow channel (4) from the second flow channel opening (42), the gas has a second movement direction (104) at the second flow channel opening (42), the included angle between the second movement direction (104) and the extension direction of the second tangent line (102) is i2, and the angle range of i2 is 5-15°; The inner wall of the shroud (3) has a third tangent line (105) extending along the direction from one end to the other end, and the distance between the third tangent line (105) and the second tangent line (102) is δ, and the length range of δ is 0.1-1.0mm.

2. A blowcer fan motor as claimed in claim 1, wherein: The plurality of fan blades (22) respectively have projections on the radial plane of the hub (21), and the plurality of projections are arranged to overlap with each other.

3. A blowcer fan motor as claimed in claim 1, wherein: Every two adjacent fan blades (22) overlap with each other to form an overlapping part, the length of the overlapping part is L1, the chord length of the fan blade (22) is L2, and 3L1≥2L2.

4. A blowcer according to claim 1, characterized in that: The air-blowing fan motor further comprises a stationary impeller (6) arranged between the fan (2) and the motor body (1), and a wheel cover (7) arranged on the stationary impeller (6), and a second gas flow channel (8) is formed between the stationary impeller (6) and the wheel cover (7), and the second gas flow channel (8) is in communication with the first gas flow channel (4).

5. A blowcer for a fan motor as claimed in claim 4 wherein: A plurality of impeller ribs (9) are arranged at the circumferential side of the stationary impeller (6), the impeller ribs (9) are accommodated in the second gas flow channel (8), the number of the impeller ribs (9) is M, the number of the fan blades (22) is N, and M=N+n, wherein n is a positive integer less than 4.

6. A blowcer fan motor as claimed in claim 5, wherein: The end of the impeller rib (9) away from the stationary impeller (6) has a second blade tip (91), the second blade tip (91) has a fourth tangent line (106) extending along the direction from one end to the other end of the stationary impeller (6), the rotating shaft (5) is coaxially arranged in the stationary impeller (6) and rotationally connected with the stationary impeller (6), and the included angle between the fourth tangent line (106) and the axis line (101) of the rotating shaft (5) is f, and the angle range of f is 0-5°.

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