Current collector and centrifugal fan comprising same

Abstract

The utility model provides a current collector and a centrifugal fan comprising the same, the current collector is correspondingly arranged at an air inlet of an impeller, and the current collector comprises a first flow guide part, a second flow guide part and a third flow guide part, the second flow guide part is located between the first flow guide part and the air inlet, the second flow guide part and the first flow guide part are integrally formed, and the second flow guide part is obliquely arranged towards blades of the impeller; the tangential extension line of the end, deviating from the first flow guide part, of the second flow guide part extends to blades of the impeller, the distance between the end point of the tangential extension line and an end ring, close to the flow collector, of the impeller is h, the axial size of the impeller is H, and h / H is larger than or equal to 0 and smaller than or equal to 0.3. The second flow guide part is obliquely arranged towards the blades, so that the static pressure at the air inlet of the impeller is reduced, the air inlet condition is improved, and obvious abnormal noise and strong turbulent vibration of the fan are prevented. In addition, by limiting the range of the ratio of h to H, flow turbulence and vortex noise in the flow channel are reduced.

Description

Technical Field

[0001] This utility model specifically relates to a collector and a centrifugal fan containing the collector. Background Technology

[0002] Multi-blade centrifugal fans typically feature a collector. Existing collectors have a cross-sectional profile consisting of a circular arc section away from the impeller and a straight section extending towards the impeller. When air is drawn into the fan, its flow direction changes through the circular arc section and is guided into the impeller's inlet by the straight section. However, in actual use, it has been found that the air entering the impeller's inlet through the straight section experiences a sudden increase in flow area at the end of the collector. Since the air guided by the straight section flows along the impeller's axial direction, the fluid direction and velocity change drastically as it diffuses radially towards the impeller. This causes a sudden increase in static pressure at the impeller's inlet. When the intake conditions fluctuate, the fluid velocity and static pressure also pulsate, resulting in noticeable abnormal noise and strong turbulence from the fan. Furthermore, the airflow needs space to change from axial to radial after entering the impeller. Therefore, areas near the collector on the impeller side tend to have less air, where the blades cannot effectively work on the air, leading to turbulent flow within the flow channel and generating vortex noise. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of abnormal noise, turbulence and eddy noise caused by the shape of the collector in the prior art, and to provide a collector and a centrifugal fan containing the collector.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A collector, wherein the collector is disposed corresponding to the air inlet of an impeller, the collector comprising:

[0006] A first flow guide is arranged around the air inlet and away from the air inlet;

[0007] The second guide section is located between the first guide section and the air inlet and is integrally formed with the first guide section. The second guide section is inclined toward the blades of the impeller.

[0008] The tangential extension line of the end of the second guide section away from the first guide section extends to the blade of the impeller, and the distance between the endpoint of the tangential extension line and the end ring of the impeller near the collector is h. The axial dimension of the impeller is H, and 0≤h / H≤0.3.

[0009] In this design, by tilting the second guide section towards the blades, compared to having the second guide section parallel to the impeller's axial direction, the air entering the impeller through the collector can quickly change its flow direction. This results in a gradual rather than abrupt increase in the flow area of ​​the air entering the impeller through the collector, preventing a sudden increase in the flow area at the end of the collector. This reduces the static pressure at the impeller's inlet, improves the intake conditions, and prevents noticeable abnormal noise and strong turbulence from occurring in the fan. Furthermore, by limiting the range of the h-H ratio, the airflow changes from axial to radial earlier after entering the impeller. Therefore, the area of ​​the impeller near the collector can be effectively filled with air and perform work, reducing flow turbulence and vortex noise within the flow channel.

[0010] Preferably, the cross-section of the first guide portion is an arc shape, and the cross-section of the second guide portion is an arc shape.

[0011] In this solution, the above settings are used to guide the airflow and change its direction.

[0012] Preferably, the cross-section of the first guide section also includes a straight line, which is arranged parallel to the plane of the end ring of the impeller near the collector.

[0013] In this solution, the above-mentioned configuration is used to rectify the airflow through the first guide section, thereby preventing turbulent flow when the air enters the air inlet.

[0014] Preferably, the distance d is between the end of the second guide portion away from the first guide portion and the plane containing the straight profile of the first guide portion, and the distance D is between the plane containing the first guide portion and the end ring of the impeller near the collector, and 0.5D≤d≤0.95D.

[0015] In this solution, the above settings limit the distance between the first guide section and the impeller end ring, as well as the distance between the second guide section and the plane where the first guide section is located, to ensure the air velocity entering the air inlet, avoid sudden changes in flow velocity, and reduce noise under stable airflow conditions.

[0016] Preferably, the distance between the plane of the first guide section and the end ring of the impeller near the collector is in the range of 4-8 mm.

[0017] In this solution, the above settings are used to limit D to ensure that the airflow direction is effectively redirected, thus avoiding the situation where the area near the collector of the impeller is not effectively filled with air and generates vortex noise when D is too small.

[0018] Preferably, the diameter of the first guide portion is smaller than the diameter of the end of the second guide portion away from the first guide portion, the diameter of the first guide portion is r, the diameter of the end of the second guide portion away from the first guide portion is R, and (Rr) / r≤0.18.

[0019] In this solution, by setting the above-mentioned parameters to limit the diameter of the first guide section and the distance between the second guide section and the end diameter of the first guide section, sufficient air intake is ensured.

[0020] Preferably, the diameter of the first guide portion is in the range of 42-52 mm.

[0021] In this solution, the above-mentioned settings are used to limit the diameter of the first guide section to ensure the airflow entering the air inlet.

[0022] Preferably, the cross-section of the first guide portion is an arc shape, and the cross-section of the second guide portion is a straight line.

[0023] In this design, by setting the cross-section of the second guide section to a straight line, the flow velocity of the air entering the impeller is increased, so that the air can effectively fill the area of ​​the impeller near the collector, resulting in less vortex noise.

[0024] Preferably, the second guide portion forms an angle of 40±5° with the plane containing the first guide portion.

[0025] In this design, the tilt angle of the second guide section is limited to ensure that it effectively fills the area near the collector side of the impeller.

[0026] A centrifugal fan, the centrifugal fan including the collector as described above.

[0027] In this design, the centrifugal fan includes the aforementioned collector, which tilts the second guide section towards the blades while limiting the range of the h-H ratio. This ensures that the air entering the impeller through the collector quickly changes direction, preventing a sudden increase in the flow area at the end of the collector, reducing the static pressure at the impeller inlet, improving airflow conditions, and preventing noticeable abnormal noise and strong turbulence. It also allows the area of ​​the impeller near the collector to be effectively filled with air, reducing flow turbulence and eddy noise within the flow channel.

[0028] The positive and progressive effects of this invention are as follows: By tilting the second guide section towards the blades, compared to having the second guide section parallel to the axial direction of the impeller, this invention allows the air entering the impeller through the collector to quickly change its flow direction. This results in a gradual rather than abrupt increase in the flow area of ​​the air entering the impeller through the collector, preventing a sudden increase in the flow area at the end of the collector. This reduces the static pressure at the impeller's inlet, improves the intake conditions, and prevents noticeable abnormal noise and strong turbulence in the fan. Furthermore, by limiting the range of the h-H ratio, the airflow changes from axial to radial earlier after entering the impeller. Therefore, the area of ​​the impeller near the collector can be effectively filled with air and perform work, reducing flow turbulence and eddy noise within the flow channel. Attached Figure Description

[0029] Figure 1 This is a perspective view of the centrifugal fan of Embodiment 1 of this utility model.

[0030] Figure 2 This is a diagram showing the positional relationship between the collector and the impeller in Embodiment 1 of this utility model.

[0031] Figure 3 This is a diagram showing the positional relationship between the first guide portion and the second guide portion in Embodiment 1 of this utility model.

[0032] Figure 4 This is a diagram showing the positional relationship between the collector and the impeller in Embodiment 2 of this utility model.

[0033] Figure 5 This is a diagram showing the positional relationship between the first guide portion and the second guide portion in Embodiment 2 of this utility model.

[0034] Figure 6 This is a diagram showing the axial velocity distribution of the centrifugal fan of this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] Collector 1

[0037] First guide section 11

[0038] Second guide section 12

[0039] Impeller 2

[0040] Air inlet 21

[0041] Leaf 22

[0042] End ring 23

[0043] Tangential extension line 3 Detailed Implementation

[0044] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0045] Example 1

[0046] This embodiment provides a current collector, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 and Figure 6 As shown, the collector 1 is disposed at the air inlet 21 of the impeller 2, and the collector 1 includes:

[0047] The first guide section 11 is arranged around the air inlet 21 and is positioned away from the air inlet 21;

[0048] The second guide section 12 is located between the first guide section 11 and the air inlet 21 and is integrally formed with the first guide section 11. The second guide section 12 is inclined toward the blade 22 of the impeller 2.

[0049] The tangential extension line 3 of the second guide section 12, which is away from the end of the first guide section 11, extends to the blade 22 of the impeller 2. The distance between the endpoint of the tangential extension line 3 and the end ring 23 of the impeller 2 near the collector 1 is h. The axial dimension of the impeller 2 is H, and 0≤h / H≤0.3.

[0050] Specifically, the collector 1 is mounted on the air inlet end of the impeller 2, and the collector 1 forms a through hole corresponding to the air inlet 21. The through hole communicates with the air inlet 21. This is existing technology and will not be described in detail here. The wall of the through hole is composed of a first guide portion 11 and a second guide portion 12. The second guide portion 12 is located close to the air inlet 21 and is inclined towards the blade 22. Compared to the second guide portion 12 extending along the axial direction of the impeller 2, the inclined orientation of the second guide portion 12 towards the blade 22 allows the air entering the impeller 2 after passing through the collector 1 to quickly change its flow direction, such as... Figure 6 As shown, the airflow changes from axial to radial flow earlier after entering the impeller 2, and the airflow area entering the impeller 2 through the collector 1 gradually increases rather than increases dramatically. This avoids a sudden increase in the flow area at the end of the collector 1 when the air enters the air inlet 21 of the impeller 2, reduces the sudden increase in static pressure at the air inlet 21 of the impeller 2, improves the air intake conditions, and prevents the fan from having obvious abnormal noise and strong turbulence.

[0051] Furthermore, in this embodiment, the tangential extension line 3 of the end of the inclined second guide section 12 that is away from the first guide section 11 extends to the blade 22. Along the axial direction of the impeller 2, the distance between the endpoint of the tangential extension line 3 and the end ring 23 of the impeller 2 near the collector 1 is h. By limiting the range of the ratio of h and H, so that h is small, when the air enters the impeller 2 after being guided by the collector 1, the axial region of the impeller 2 near the collector 1 can be effectively filled by the air guided into the impeller 2 by the second guide section 12 and do work, preventing the generation of flow gaps in the axial region of the impeller 2 near the collector 1, thereby reducing flow turbulence and eddy noise in the impeller 2 flow channel, improving the fan performance and enhancing the user experience.

[0052] In this embodiment, the cross-section of the first guide section 11 is an arc-shaped line, and the cross-section of the second guide section 12 is an arc-shaped line.

[0053] Specifically, the cross-section of the first guide section 11 is an arc shape, and the arc shape has a rounded corner with a radius of 1.5 mm. The cross-section of the second guide section 12 is also an arc shape, but the curvature is different from that of the arc shape of the first guide section 11. Since the first guide section 11 is away from the air inlet 21, when air is intake, the outside air first contacts the first guide section 11, then flows through the first guide section 11 to the second guide section 12, and is guided to the air inlet 21 through the second guide section 12.

[0054] In this embodiment, the cross-section of the first guide section 11 also includes a straight line, which is arranged parallel to the plane where the impeller 2 is located near the end ring 23 of the collector 1.

[0055] Specifically, from a cross-sectional perspective, the first guide section 11 includes not only an arc-shaped profile but also a straight profile. The straight profile is arranged parallel to the plane where the impeller 2 is located near the end ring 23 of the collector 1. The straight profile can extend to the edge of the fan casing. Of course, the extension dimension of the straight profile can also be relatively short, that is, the front plate of the fan casing is provided with a through hole, the collector 1 overlaps on the through hole, and the straight profile overlaps with the front plate. It is understandable that when the air outside the impeller 2 enters the impeller 2 through the collector 1, in addition to the air located outside the axial direction of the impeller 2, there is also air in the radial direction of the impeller 2. The air in the radial direction of the impeller 2 first comes into contact with the straight profile and then changes its flow direction through the arc profile of the first guide section 11. It is then guided by the inclined arrangement of the second guide section 12 and finally flows into the impeller 2. By setting a straight profile in addition to the arc profile of the first guide section 11, the air in the radial direction of the impeller 2 is rectified by the straight profile when it flows into the collector 1. Compared with the first guide section 11 having two arc profiles and the arc profile near the through hole protruding from the front plate in the axial direction of the impeller 2, the change in air flow direction is small, avoiding the flow turbulence caused by the large change in flow direction when the air enters the air inlet 21.

[0056] In this embodiment, the distance d between the end of the second guide section 12 away from the first guide section 11 and the plane containing the straight line of the first guide section 11 is d, and the distance D between the plane containing the first guide section 11 and the end ring 23 of the impeller 2 near the collector 1 is 0.5D≤d≤0.95D.

[0057] Specifically, while the second guide section 12 is inclined toward the blade 22, the distance d between the end of the second guide section 12 away from the first guide section 11 and the plane containing the straight line of the first guide section 11 along the axial direction of the impeller 2 is the same as the distance D between the plane containing the first guide section 11 and the end ring 23 of the impeller 2 near the collector 1 along the axial direction of the impeller 2. By limiting the ratio of d and D, the extension dimension of the second guide section 12 along the axial direction of the impeller 2 meets the requirements of air intake and can effectively guide the air, ensuring the air velocity entering the air inlet 21, avoiding sudden changes in flow velocity, and reducing noise under stable airflow conditions.

[0058] In this embodiment, the distance between the plane of the first guide section 11 and the end ring 23 of the impeller 2 near the collector 1 is 4-8 mm. By further limiting the size range of D, that is, the distance between the plane of the first guide section 11 and the end ring 23 of the impeller 2 near the collector 1, sufficient turning space is ensured when air flows from the collector 1 into the air inlet 21, avoiding the situation where the area of ​​the impeller 2 near the collector 1 is not effectively filled with air and generates vortex noise when D is too small.

[0059] It is understandable that by substituting D into 0.5D≤d≤0.95D, the range of values ​​for d can be obtained.

[0060] In this embodiment, the diameter of the first guide portion 11 is smaller than the diameter of the end of the second guide portion 12 away from the first guide portion 11. The diameter of the first guide portion 11 is r, and the diameter of the end of the second guide portion 12 away from the first guide portion 11 is R, and (Rr) / r≤0.18.

[0061] Specifically, in cross-section, the collector 1 has a trumpet-shaped structure with the diameter of the trumpet-shaped structure gradually increasing towards the air inlet 21. That is, the diameter of the first guide section 11 is smaller than the diameter of the end of the second guide section 12 away from the first guide section 11. By limiting the ratio of r and R, the dimensions of r and R are guaranteed, avoiding the dimensions of r and R being too small, so that the airflow entering the air inlet 21 through the collector 1 is sufficient.

[0062] In this embodiment, the diameter of the first guide section 11 ranges from 42 to 52 mm. Limiting the diameter of the first guide section 11 ensures the airflow rate entering the air inlet 21. It can be understood that by substituting r into (Rr) / r≤0.18, the range of values ​​for R can be obtained.

[0063] This embodiment also provides a centrifugal fan, which includes the aforementioned collector 1, to tilt the second guide section 12 toward the blades 22 while limiting the range of the ratio of h and H. This ensures that the air entering the impeller 2 after passing through the collector 1 quickly changes its flow direction, preventing a sudden increase in the flow area at the end of the collector 1, reducing the static pressure at the air inlet 21 of the impeller 2, improving the air intake conditions, and preventing obvious abnormal noise and strong turbulence from occurring in the fan. It also allows the area of ​​the impeller 2 near the collector 1 to be effectively filled with air, reducing flow turbulence and eddy noise within the impeller 2's flow channel.

[0064] In addition, the centrifugal fan in this embodiment can also be controlled by a voice module. The centrifugal fan is equipped with a controller, a voice receiving module, and a voice parsing module as in the prior art. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller starts or stops the range hood accordingly, thereby realizing intelligent control of the centrifugal fan and improving the user experience.

[0065] Example 2

[0066] like Figure 4 and Figure 5 As shown, the collector 1 in this embodiment is roughly the same as the collector in embodiment 1, except that the cross-section of the first guide section 11 is an arc shape and the cross-section of the second guide section 12 is a straight line.

[0067] Specifically, the cross-section of the second guide section 12 is an inclined straight line. Compared with the arc-shaped cross-section of the second guide section 12 in Embodiment 1, the air flows faster and more smoothly when guided through the second guide section 12, so that the air can effectively fill the area of ​​the impeller 2 near the collector 1, and the vortex noise is also smaller.

[0068] Preferably, the wall thickness of the first guide portion 11 is 0.8 mm, the diameter of the first guide portion 11 is 44 mm, and the arc shape of the first guide portion 11 is a rounded corner with a radius of 1.5 mm.

[0069] Furthermore, the distance d between the end of the second guide section 12 away from the straight line of the first guide section 11 and the straight line of the first guide section 11 is 4.46 mm.

[0070] In this embodiment, the plane containing the second guide section 12 and the first guide section 11 forms an angle of 40±5°. Since the cross-section of the second guide section 12 is a straight line and is inclined, in order to ensure that the airflow guided by the second guide section 12 is faster and smoother, the inclination angle of the second guide section 12 is limited to ensure that the air entering the impeller 2 near the collector 1 meets the requirements.

[0071] Preferably, the plane containing the second guide section 12 forms a 40° angle with the plane containing the first guide section 11.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A current collector corresponding to a suction port provided to an impeller, characterized by, The flow collector comprises: a first flow guide part, which is annularly arranged at the air inlet and is arranged away from the air inlet; a second flow guide part, which is arranged between the first flow guide part and the air inlet and is integrally formed with the first flow guide part, and is arranged to be inclined towards the blades of the impeller; a tangential extension line of an end of the second flow guide part away from the first flow guide part extends to the blades of the impeller, and an end point of the tangential extension line is spaced apart from an end ring of the impeller close to the flow collector by a distance h, an axial dimension of the impeller is H, and 0≤h / H≤0.

3.

2. The current collector of claim 1, wherein The cross section of the first flow guide part is an arc-shaped profile line, and the cross section of the second flow guide part is an arc-shaped profile line.

3. The current collector of claim 2, wherein The cross section of the first flow guide part further comprises a straight profile line, which is arranged in parallel with a plane in which the end ring of the impeller close to the flow collector is located.

4. The current collector of claim 3, wherein The distance between the end of the second flow guide part away from the first flow guide part and the plane in which the straight profile line of the first flow guide part is located is d, the distance between the plane in which the first flow guide part is located and the end ring of the impeller close to the flow collector is D, and 0.5D≤d≤0.95D.

5. The current collector of claim 4, wherein The distance between the plane in which the first flow guide part is located and the end ring of the impeller close to the flow collector is in the range of 4-8 mm.

6. The current collector of claim 1, wherein The diameter of the first flow guide part is smaller than the diameter of the end of the second flow guide part away from the first flow guide part, the diameter of the first flow guide part is r, the diameter of the end of the second flow guide part away from the first flow guide part is R, and (R-r) / r≤0.

18.

7. The current collector of claim 6, wherein The diameter of the first flow guide part is in the range of 42-52 mm.

8. The current collector of claim 1, wherein The cross section of the first flow guide part is an arc-shaped profile line, and the cross section of the second flow guide part is a straight profile line.

9. The current collector of claim 8, wherein The second flow guide part forms an angle of 40±5° with the plane in which the first flow guide part is located.

10. A centrifugal fan characterized by The centrifugal fan comprises the flow collector according to any one of claims 1-9.

Images