A three-section gradient fan impeller and a car seat fan having it

Abstract

This utility model discloses a three-segment gradient fan impeller and a car seat fan incorporating it. The impeller body includes a central hub and an annular extension. Several fan blades are arranged circumferentially along the hub on the annular extension. Each fan blade includes a first guide vane, a second guide vane, and a third guide vane. The first guide vane has a first guide slope facing the hub, the second guide vane has a second guide slope facing the hub, and the third guide vane has a third guide slope facing the hub. The distance between the corresponding points of the first, second, and third guide slopes closest to their distal ends relative to the hub's central axis L gradually increases, while the distance between the corresponding points of the first, second, and third guide slopes closest to their proximal ends relative to the hub's central axis L is equal. This design effectively reduces noise and increases airflow.

Description

Technical Field

[0001] This utility model relates to the field of automotive fan technology, and in particular to a three-section gradient fan impeller and an automotive seat fan having the same. Background Technology

[0002] When driving in the summer, the areas of car seats that come into contact with the human body often have difficulty dissipating heat, which can easily lead to stuffiness. To address this, some cars now have fans installed on the seats to circulate air and remove heat and moisture from the seat surface, keeping the contact areas dry and comfortable.

[0003] In existing technologies, some fans are designed as centrifugal fans. These centrifugal fans have an impeller and a shroud housing. The impeller has multiple blades, and the shroud housing has an air outlet channel. When the blades of the impeller pass through the air outlet channel, since the blades are all the same length and the distance between each blade and the throat is fixed, a fixed frequency of airflow noise is generated. However, continuous fixed-frequency noise can easily accumulate and create a noise peak, causing discomfort to the user. In addition, modern car seats integrate a large number of functions, which, while making them more intelligent, also requires higher efficiency and generates higher temperatures. As a result, the motor speed in the fan is constantly increasing. Although a higher motor speed can increase the air volume of the fan, a higher speed fan is also accompanied by greater noise, causing user discomfort and affecting the driving safety of the driver. Utility Model Content

[0004] The purpose of this invention is to provide a three-section gradient fan impeller and a car seat fan with the same, which has the effects of reducing noise and increasing air volume.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a three-section gradient fan impeller, including an impeller body, the impeller body including a hub located at the center and an annular extension extending radially outward along the edge of the hub, the annular extension having a plurality of fan blades arranged circumferentially along the hub, the fan blades including a first guide vane, a second guide vane and a third guide vane, the plurality of first guide vanes, second guide vanes and third guide vanes being arranged alternately and at intervals on the annular extension;

[0006] The impeller body includes a proximal end near the hub and a distal end away from the hub. The first guide vane has a first guide slope on the side facing the hub, the second guide vane has a second guide slope on the side facing the hub, and the third guide vane has a third guide slope on the side facing the hub. The distance between corresponding points of the first, second, and third guide slopes near the distal end relative to the hub central axis L gradually increases, and the distance between corresponding points of the first, second, and third guide slopes near the proximal end relative to the hub central axis L is equal.

[0007] By adopting the above technical solution, when the impeller body rotates, the first guide vane, the second guide vane, and the third guide vane alternate at the air outlet channel of the wind shroud housing. Due to the different opening angles of the first guide slope, the second guide slope, and the third guide slope, the effective air guiding area of ​​the first guide vane, the second guide vane, and the third guide vane is different, which leads to the periodic change of the air volume at the air outlet channel position, thereby preventing the generation of fixed frequency airflow noise and having the effect of reducing noise and increasing air volume.

[0008] A further feature of this invention is that the second guide slope includes a proximal guide section and a distal guide section, wherein the inclination angle θ of the proximal guide section relative to the hub center axis L is greater than the inclination angle φ of the distal guide section relative to the hub center axis L.

[0009] A further feature of this invention is that the inclination angle γ of the first guide slope relative to the hub center axis L is less than the inclination angle θ of the proximal guide section relative to the hub center axis L.

[0010] A further feature of this invention is that the inclination angle θ of the proximal guide section relative to the hub center axis L is greater than the inclination angle ω of the third guide slope relative to the hub center axis L.

[0011] A further feature of this invention is that the vertical distance between the first guide slope and the hub center axis L gradually increases from the side closer to the annular extension towards the side farther from the annular extension; the vertical distance between the distal guide section and the hub center axis L gradually increases from the side closer to the annular extension towards the side farther from the annular extension; and the vertical distance between the third guide slope and the hub center axis L gradually increases from the side closer to the annular extension towards the side farther from the annular extension.

[0012] A further feature of this invention is that the first guide vane, the second guide vane, and the third guide vane are fixedly connected on the side away from the annular extension via an annular ring portion.

[0013] A further feature of this invention is that one end of the first guide slope near the annular portion extends to the inner ring of the annular portion.

[0014] A car seat fan includes a fan housing, the fan housing having a duct chamber, an air inlet and an air outlet communicating with the duct chamber, a drive device being provided in the duct chamber, and a three-section gradient fan impeller being provided in the duct chamber, the drive device driving the impeller body to rotate via an output shaft.

[0015] By adopting the above technical solution, when the driving device drives the impeller body to rotate, the airflow is thrown out through the gap between the first guide vane and the second guide vane, between the second guide vane and the third guide vane, or between the third guide vane and the first guide vane. By utilizing the difference in centrifugal force between the first guide vane, the second guide vane and the third guide vane, airflow of different discharge volumes can be periodically discharged from the air outlet, effectively preventing fixed-frequency airflow noise from being generated at the connection between the air duct chamber and the air outlet.

[0016] A further feature of this invention is that the fan housing is provided with a Type-C interface, and a control motherboard electrically connected to the Type-C interface is provided inside the fan housing.

[0017] By adopting the above technical solutions, the Type-C interface has low cost, small interface space occupation, and is also easy to use.

[0018] A further feature of this invention is that the wind shield housing includes a bushing portion, the output shaft is floatingly connected within the bushing portion, and the bushing portion and the output shaft are rotatably connected via a bearing. A spring is sleeved on the output shaft, one end of the spring elastically abuts against the inner ring of the bearing, and the other end of the spring elastically abuts against the hub. An anti-disengagement component is provided at the end of the output shaft away from the spring, and the output shaft is anti-disengaged from the bearing through the anti-disengagement component.

[0019] By adopting the above technical solution, the impeller body is floatingly connected to the fan housing via the output shaft, and the impeller body is buffered and damped in the axial direction of the output shaft by the spring. At the same time, the anti-detachment component is used to prevent the output shaft from detaching from the bearing.

[0020] In summary, this utility model has the following beneficial effects:

[0021] A plurality of first, second, and third guide vanes are arranged around the hub of the impeller body. The first guide vane has a first guide slope facing the hub, the second guide vane has a second guide slope facing the hub, and the third guide vane has a third guide slope facing the hub. The distance between the corresponding points of the first, second, and third guide slopes closest to their distal ends relative to the hub's central axis L gradually increases. The corresponding points of the first, second, and third guide slopes closest to their proximal ends... The distance between the points relative to the hub center axis L is equal. When the impeller body rotates, the first guide vane, the second guide vane, and the third guide vane alternate at the air outlet channel of the wind shroud housing. Due to the different opening angles of the first guide slope, the second guide slope, and the third guide slope, the effective air guiding area of ​​the first guide vane, the second guide vane, and the third guide vane is different, which leads to the periodic change of the air volume at the air outlet channel position. This prevents the generation of fixed frequency airflow noise and has the effect of reducing noise and increasing air volume. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the impeller body of this utility model.

[0023] Figure 2 This is a utility model Figure 1 A magnified view of a portion of region A in the middle.

[0024] Figure 3 This is a utility model Figure 1 Another perspective.

[0025] Figure 4 This is a side view of the impeller body of this utility model.

[0026] Figure 5 This is a utility model Figure 4 Sectional view of section BB.

[0027] Figure 6 This is a utility model Figure 5 A magnified view of a portion of region D.

[0028] Figure 7 This is a utility model Figure 4 A sectional view of section CC.

[0029] Figure 8 This is a utility model Figure 7 A magnified view of a portion of region E in the middle.

[0030] Figure 9 This is a cross-sectional view of the impeller body of this utility model at the position of the first guide vane, wherein L'

[0031] It is a line parallel to the center axis L of the wheel hub.

[0032] Figure 10 This is a cross-sectional view of the impeller body of this utility model at the position of the second guide vane, wherein L'

[0033] It is a line parallel to the center axis L of the wheel hub.

[0034] Figure 11 This is a cross-sectional view of the impeller body of this utility model at the position of the third guide vane, wherein L'

[0035] It is a line parallel to the center axis L of the wheel hub.

[0036] Figure 12 This is a structural diagram of a car seat fan with an impeller body installed according to this utility model.

[0037] Figure 13 This is a utility model Figure 12 A longitudinal sectional view.

[0038] Figure 14 This is a utility model Figure 12 Exploded view.

[0039] In the diagram: 1. Impeller body; 11. Hub; 111. Heat dissipation hole; 12. Annular extension; 13. Exhaust gap; 14. Annular ring; 15. Air inlet channel; 2. Fan blade; 21. First guide vane; 211. First guide slope; 22. Second guide vane; 221. Second guide slope; 2211. Proximal guide section; 2212. Distal guide section; 23. Third guide vane; 231. Third guide slope; 3. Fan cover housing; 31. Air duct chamber; 32. Air inlet; 33. Air outlet; 34. Shaft sleeve; 35. Bearing; 36. Type-C interface; 37. Control motherboard; 4. Drive device; 41. Output shaft; 411. Anti-detachment component; 5. Spring. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings.

[0041] A three-stage gradient fan impeller, such as Figures 1-8As shown, the impeller body 1 includes a hub 11 located at the center and an annular extension 12 extending radially outward along the edge of the hub 11. A plurality of fan blades 2 are arranged circumferentially around the hub 11 on the annular extension 12. Each fan blade 2 includes a first guide vane 21, a second guide vane 22, and a third guide vane 23. The first guide vane 21, second guide vane 22, and third guide vane 23 are arranged alternately and at intervals on the annular extension 12. An air intake channel 15 is formed between the first guide vane 21 and the hub 11, between the second guide vane 22 and the hub 11, and between the third guide vane 23 and the hub 11. A heat dissipation hole 111 is provided on the hub 11, and adjacent first guide vanes 21 and third guide vanes 23... Exhaust gaps 13 are formed between the two guide vanes 22, between the second guide vane 22 and the third guide vane 23, and between the third guide vane 23 and the first guide vane 21. On the same cross section perpendicular to the central axis L of the impeller body 1 and the hub 11, the vertical distance between the first guide slope 211 section point a and the central axis L of the hub 11 is greater than the vertical distance between the third guide slope 231 section point c and the central axis L of the hub 11. The vertical distance between the second guide slope 221 section point b and the central axis L of the hub 11 is greater than the vertical distance between the third guide slope 231 section point c and the central axis L of the hub 11.

[0042] like Figures 1-2 and Figures 4-8 As shown, the impeller body 1 includes a proximal end near the hub 11 and a distal end away from the hub 11. The opening of the exhaust gap 13 gradually increases from the side near the proximal end towards the distal end. The first guide vane 21 has a first guide slope 211 facing the hub 11, the second guide vane 22 has a second guide slope 221 facing the hub 11, and the third guide vane 23 has a third guide slope 231 facing the hub 11. The first guide slope 211, the second guide slope 221, and the third guide slope 231 are all present. The distance between the corresponding points closest to the distal end and the central axis L of the hub 11 gradually increases. The distance between the corresponding points closest to the proximal end of the first guide slope 211, the second guide slope 221, and the third guide slope 231 and the central axis L of the hub 11 is equal. The side of the first guide vane 21, the second guide vane 22, and the third guide vane 23 away from the annular extension 12 is fixedly connected by the annular ring portion 14. The end of the first guide slope 211 near the annular ring portion 14 extends to the inner ring of the annular ring portion 14.

[0043] like Figures 1-11As shown, the second guide slope 221 includes a proximal guide section 2211 and a distal guide section 2212. The inclination angle θ of the proximal guide section 2211 relative to the central axis L of the hub 11 is greater than the inclination angle φ of the distal guide section 2212 relative to the central axis L of the hub 11. The inclination angle γ of the first guide slope 211 relative to the central axis L of the hub 11 is less than the inclination angle θ of the proximal guide section 2211 relative to the central axis L of the hub 11. In this embodiment, the inclination angle θ is set to 90°, and the inclination angle φ is set to a range of 25-45°. The oblique angle φ is set to 28°, and the tilt angle γ is set between 35-45°. In this embodiment, the tilt angle γ is set to 37°. The tilt angle θ of the proximal guide section 2211 relative to the central axis L of the hub 11 is greater than the tilt angle ω of the third guide slope 231 relative to the central axis L of the hub 11. The tilt angle ω is set between 30-45°. In this embodiment, the tilt angle ω is set to 31°. The vertical distance between the first guide slope 211 and the central axis L of the hub 11 gradually changes from the side closer to the annular extension 12 to the side farther away from the annular extension 12. The vertical distance between the distal guide section 2212 and the central axis L of the hub 11 gradually increases from the side closer to the annular extension 12 toward the side farther away from the annular extension 12. Similarly, the vertical distance between the third guide slope 231 and the central axis L of the hub 11 also gradually increases from the side closer to the annular extension 12 toward the side farther away from the annular extension 12. Furthermore, in this embodiment, the first guide vane 21, the second guide vane 22, and the third guide vane 23 extend from the distal end relative to the annular extension 12, and the first guide vane 21 and the second guide vane 22... The third guide vane 23 is located on one side of the distal end and is flush with the edge of the annular portion 14; a plurality of first guide vanes 21, second guide vanes 22 and third guide vanes 23 are arranged perpendicularly to the annular extension portion 12, and the first guide vanes 21, second guide vanes 22 and third guide vanes 23 are all designed as arc-shaped fan blades 2. The first guide vanes 21, second guide vanes 22 and third guide vanes 23 with the shape of arc-shaped fan blades 2 can generate greater air guiding efficiency, which is conducive to more powerfully throwing the airflow between adjacent guide vanes radially through centrifugal force, thereby improving the air outlet speed.

[0044] The basic working principle of this utility model is as follows: A plurality of first guide vanes 21, second guide vanes 22, and third guide vanes 23 are arranged around the hub 11 of the impeller body 1. The first guide vane 21 has a first guide slope 211 facing the hub 11, the second guide vane 22 has a second guide slope 221 facing the hub 11, and the third guide vane 23 has a third guide slope 231 facing the hub 11. The impeller body 1 includes a proximal end near the hub 11 and a distal end away from the hub 11. The distance between the corresponding points of the first guide slope 211, the second guide slope 221, and the third guide slope 231 closest to the distal end and relative to the central axis L of the hub 11 gradually increases. The corresponding points of the closest proximal ends of the surface 211, the second guide slope 221, and the third guide slope 231 are equidistant from the central axis L of the hub 11. When the impeller body 1 rotates, the first guide vane 21, the second guide vane 22, and the third guide vane 23 alternate at the air outlet channel of the wind shroud housing 3. Due to the different opening angles of the first guide slope 211, the second guide slope 221, and the third guide slope 231, the effective air guiding areas of the first guide vane 21, the second guide vane 22, and the third guide vane 23 are different, which leads to the periodic change of the air volume at the air outlet channel position, thereby preventing the generation of fixed frequency airflow noise and having the effect of reducing noise and increasing air volume.

[0045] A type of car seat fan, such as Figures 12-14As shown, the device includes a fan housing 3, which has a duct chamber 31, an air inlet 32 ​​communicating with the duct chamber 31, and an air outlet 33. A drive device 4 is installed inside the duct chamber 31, and the aforementioned three-section gradient fan impeller is also installed within the duct chamber 31. The drive device 4 drives the impeller body 1 to rotate via an output shaft 41. When the drive device 4 drives the impeller body 1 to rotate, the airflow is thrown out through the gaps between the first guide vane 21 and the second guide vane 22, between the second guide vane 22 and the third guide vane 23, or between the third guide vane 23 and the first guide vane 21. Utilizing the difference in centrifugal force between the first guide vane 21, the second guide vane 22, and the third guide vane 23, airflow of different discharge volumes can be periodically discharged from the air outlet 33, effectively preventing fixed-frequency airflow noise at the connection between the duct chamber 31 and the air outlet 33. The fan housing 3 is equipped with a Type-C interface 36. The housing 3 contains a control board 37 electrically connected to a Type-C interface 36. The Type-C interface 36 is low-cost, occupies little space, and is easy to use. The housing 3 includes a bushing 34, and an output shaft 41 is floatingly connected inside the bushing 34. The bushing 34 and the output shaft 41 are rotatably connected by a bearing 35. A spring 5 is fitted on the output shaft 41. One end of the spring 5 elastically abuts against the inner ring of the bearing 35, and the other end of the spring 5 elastically abuts against the hub 11. An anti-detachment component 411 is provided at the end of the output shaft 41 away from the spring 5. The output shaft 41 is anti-detached from the bearing 35 through the anti-detachment component 411, so that the impeller body 1 is floatingly connected to the housing 3 through the output shaft 41. The spring 5 provides buffering and shock absorption of the impeller body 1 in the axial direction of the output shaft 41. At the same time, the anti-detachment component 411 prevents the output shaft 41 from detaching from the bearing 35.

[0046] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A three-step fan impeller comprising an impeller body (1), characterized in that: The impeller body (1) includes a hub (11) located at the center and an annular extension (12) extending radially outward along the edge of the hub (11). The annular extension (12) is provided with a plurality of fan blades (2) circumferentially along the hub (11). The fan blades (2) include a first guide vane (21), a second guide vane (22) and a third guide vane (23). The plurality of first guide vanes (21), second guide vanes (22) and third guide vanes (23) are arranged alternately and at intervals on the annular extension (12). The impeller body (1) includes a proximal end near the hub (11) and a distal end away from the hub (11). The first guide vane (21) has a first guide slope (211) facing the hub (11), the second guide vane (22) has a second guide slope (221) facing the hub (11), and the third guide vane (23) has a third guide slope (231) facing the hub (11). The distance between the corresponding points of the first guide slope (211), the second guide slope (221), and the third guide slope (231) near the distal end of the impeller gradually increases relative to the central axis L of the hub (11). The distance between the corresponding points of the first guide slope (211), the second guide slope (221), and the third guide slope (231) near the proximal end of the impeller and the central axis L of the hub (11) is equal.

2. A three-stage progressive fan impeller according to claim 1, wherein: The second guide slope (221) includes a proximal guide section (2211) and a distal guide section (2212). The proximal guide section (2211) has an inclination angle θ relative to the central axis L of the hub (11) greater than the inclination angle φ of the distal guide section (2212) relative to the central axis L of the hub (11).

3. A three-stage progressive fan impeller according to claim 2, wherein: The tilt angle γ of the first guide slope (211) relative to the central axis L of the hub (11) is smaller than the tilt angle θ of the proximal guide section (2211) relative to the central axis L of the hub (11).

4. A three-stage progressive fan impeller according to claim 2, wherein: The inclination angle θ of the proximal guide section (2211) relative to the central axis L of the hub (11) is greater than the inclination angle ω of the third guide slope (231) relative to the central axis L of the hub (11).

5. A three-stage progressive fan impeller according to claim 2, wherein: The vertical distance between the first guide slope (211) and the central axis L of the hub (11) gradually increases from the side closer to the annular extension (12) toward the side away from the annular extension (12). The vertical distance between the centroidal guide section (2212) and the central axis L of the hub (11) gradually increases from the side closer to the annular extension (12) toward the side away from the annular extension (12). The vertical distance between the third guide slope (231) and the central axis L of the hub (11) gradually increases from the side closer to the annular extension (12) toward the side away from the annular extension (12).

6. A three-stage progressive fan impeller according to claim 1, wherein: The first guide vane (21), the second guide vane (22) and the third guide vane (23) are fixedly connected by an annular ring (14) on the side away from the annular extension (12).

7. A three-stage progressive fan impeller according to claim 6, wherein: The first guide slope (211) extends from one end near the annular portion (14) to the inner ring of the annular portion (14).

8. A car seat fan comprising a fan cover housing (3) having a fan duct chamber (31), an air inlet (32) and an air outlet (33) communicating with the fan duct chamber (31), a driving device (4) being arranged in the fan duct chamber (31), characterized in that: The air duct chamber (31) is provided with a three-section gradient fan impeller as described in any one of claims 1-7, and the drive device (4) drives the impeller body (1) to rotate through the output shaft (41).

9. A car seat fan according to claim 8, characterized in that: The fan housing (3) is provided with a Type-C interface (36), and the fan housing (3) is provided with a control motherboard (37) electrically connected to the Type-C interface (36).

10. The automotive seat fan of claim 8, wherein: The wind shield housing (3) includes a bushing part (34), the output shaft (41) is floatingly connected inside the bushing part (34), and the bushing part (34) and the output shaft (41) are rotatably connected by a bearing (35). A spring (5) is sleeved on the output shaft (41), one end of the spring (5) elastically abuts against the inner ring of the bearing (35), and the other end of the spring (5) elastically abuts against the hub (11). An anti-disengagement component (411) is provided at the end of the output shaft (41) away from the spring (5), and the output shaft (41) is anti-disengaged from the bearing (35) through the anti-disengagement component (411).

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