Current collector for fan system, fan system and extractor hood

Abstract

The utility model relates to a kind of current collector for fan system, fan system and range hood, current collector is arranged at the air inlet of fan system, and it includes: flow guide portion;The second flow guide section protrudes from the first flow guide section, alternatively, both are connected by transition section, and the transition section extends from the first flow guide section junction towards the direction away from the first flow guide section, and is connected with the second flow guide section, so that the flow guide size of first flow guide section and second flow guide section is different (including flow guide height, radial dimension, insertion depth etc.).The current collector can better guide airflow into volute, and further effectively improve the turbulence intensity below the volute, thereby improving fan efficiency and reducing noise.

Description

Technical Field

[0001] This utility model relates to the field of fan system technology, and in particular to a collector for a fan system, a fan system, and a range hood. Background Technology

[0002] Range hoods utilize a fan system (usually a centrifugal fan) to extract oily air from the kitchen and discharge it into a public duct or directly outdoors. To improve airflow, increase fan efficiency, and reduce noise, a collector is typically installed at the fan inlet. The collector smoothly guides the airflow to the impeller. Using a collector effectively improves fan performance, resulting in a larger airflow and lower noise levels while operating under design conditions.

[0003] Since the centrifugal fans commonly used in range hoods are multi-blade centrifugal fans, their volutes have an asymmetrical logarithmic spiral shape, resulting in an asymmetrical flow field distribution within the volute. Generally, the collectors are designed as symmetrical, circular or rotary shapes. For example, Chinese Patent Application No. 201110432232.0 discloses a multi-blade centrifugal fan with a multi-functional flow guiding device, which consists of a multi-functional flow guiding device and a fan body. The multi-functional flow guiding device includes a collector and a flow guide, and is connected to the fan body via a mounting edge on the collector. These collectors are designed based on the assumption of uniform circumferential air intake, similar to axial flow fans, and are generally symmetrical structures. However, the multi-blade centrifugal fans used in range hoods are radial flow fans, and they are mostly installed inside a casing. Unlike axial flow fans, which have 360° uniform circumferential air intake, range hoods require airflow to be redirected from axial to radial. From an external environmental perspective, range hoods operate in complex environments, affected by factors such as the resistance of the flue pipe, the common flue, and the back pressure of the common flue. Ordinary collectors designed in the traditional way will have serious inlet vortices and turbulence, severe internal leakage and backflow, resulting in weak adaptability to operating conditions, low overall efficiency, and high noise.

[0004] Therefore, existing collectors still need further improvement. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a collector that can effectively improve the problem of inlet leakage and backflow, thereby better guiding the airflow into the volute.

[0006] The second technical problem to be solved by this utility model is to provide a fan system that can effectively improve the problem of inlet leakage and backflow, thereby better guiding the airflow into the volute, in light of the current state of the technology.

[0007] The third technical problem to be solved by this utility model is to provide a range hood that uses the above-mentioned fan system, in view of the current state of the prior art.

[0008] The technical solution adopted by this utility model to solve the first technical problem is: a collector for a fan system, which is installed at the air inlet of the fan system and includes: a guide section;

[0009] The flow guide includes a first flow guide section and a second flow guide section, wherein the second flow guide section protrudes from the first flow guide section.

[0010] The "protrusion" in the phrase "the second guide section protrudes from the first guide section" can be understood as the second guide section being located away from the first guide section and situated within the airflow channel from the collector into the fan. This results in a higher guide height for the second guide section, increasing the turning radius and thus enhancing the guide effect, and / or a smaller inner diameter / deeper insertion depth, thereby strengthening the anti-backflow effect at the impeller leading edge. The higher guide height, smaller inner diameter, or deeper insertion depth achieved by the "protrusion" of the second guide section can all improve the inlet leakage and backflow problem, thereby better guiding the airflow into the volute, improving fan efficiency, and reducing noise.

[0011] As an improvement, an annular mounting section is also included, which has a central axis. The second guide section includes a left guide section and a right guide section. Using the vertical plane of the central axis of the annular mounting section as a reference plane, the left guide section is located to the left of the reference plane, and the right guide section is located to the right of the reference plane. The second guide section is located in the bottom region. The airflow rate at the bottom inlet of the collector is larger than that at the top inlet. A larger airflow rate requires a larger turning radius for the collector to achieve better guiding performance; therefore, the above arrangement is adopted. The left and right guide sections can be arranged symmetrically or asymmetrically relative to the reference plane.

[0012] As an improvement, the central angle of the left guide section centered on the central axis of the annular mounting part is denoted as α, and the central angle of the right guide section centered on the central axis of the annular mounting part is denoted as β, where α > β. Considering that the lower left side of the collector is closer to the volute outlet, the inlet airflow of the collector is larger than that on the right side. The larger the airflow, the larger the turning radius of the collector is required, and the better its guiding effect will be. Therefore, the above setting is adopted: α > β.

[0013] As an improvement, an annular mounting section is also included, which has a central axis. The central angle formed by the second guide section relative to the central axis of the annular mounting section is denoted as S, and the value of S ranges from 30° to 180°. Since the bottom area is a region where airflow is relatively concentrated, in order to ensure a large turning radius at the bottom, the second guide section should not be too small, and its central angle should be greater than 30°. However, it is also not advisable to adopt a large turning radius setting for the second guide section for the entire collector, as this would result in an excessively small air inlet size, affecting the overall air intake efficiency. Therefore, S should be at least less than 180°.

[0014] To further improve the turbulence intensity inside the volute, the left and right guide sections should be concentrated at the bottom as much as possible, with 90°≥α>β≥15°.

[0015] As an improvement, opposite first and second directions are formed along the central axis of the annular mounting portion, with the second direction being the direction of the oil fume flow path. The guide portion also includes a radial guide portion that extends radially inward from the inner side of the annular mounting portion and bends and protrudes in the first direction. The protrusion height of the radial guide portion of the first guide section relative to the annular mounting portion along the first direction is denoted as H1, and the protrusion height of the radial guide portion of the second guide section relative to the annular mounting portion along the first direction is denoted as H3, where H3 > H1, that is, in the radial direction, the air guiding height from the second guide section is higher, thereby increasing the turning radius and enhancing the guiding effect.

[0016] Preferably, H1 < H3 < 1.5H1. When H3 ≥ 1.5H1, the guide section is too high, which will affect the front air intake space and increase the hollow area between the collector and the impeller end, which is not conducive to the backflow control of the impeller leading edge.

[0017] Further improvements include an axial flow guide extending from the inner side of the radial flow guide along a second direction; the distance between any point on the axial flow guide of the first flow guide section and the central axis of the annular mounting section is denoted as R1, and the distance between any point on the axial flow guide of the second flow guide section and the central axis of the annular mounting section (21) is denoted as R2, wherein R2 < R1, that is, the second flow guide section has a smaller inner diameter, which enhances the anti-backflow effect of the impeller leading edge.

[0018] Preferably, 0.85R1 < R2 < 0.95R1 means that when R2 ≤ 0.85R1, the inner diameter of the corresponding area of ​​the collector is small, the air inlet space of the collector is reduced, and the hollow area between the collector and the impeller end will also increase, which is not conducive to the backflow control of the impeller leading edge. On the other hand, when R2 ≥ 0.95R1, it means that the difference between the inner diameter of the collector and the overall inner diameter is small, the radial clearance between the collector and the impeller is reduced, and it cannot play a good anti-backflow effect. At the same time, the curvature of the arc-shaped guide section is too large, and the guiding effect is also affected.

[0019] As an improvement, the distance between the side edge of the axial guide portion of the first guide section away from the annular mounting portion and the annular mounting portion in the direction of extension of the central axis is denoted as H2, and the distance between the side edge of the axial guide portion of the second guide section away from the annular mounting portion and the annular mounting portion in the direction of extension of the central axis is denoted as H4, wherein H4 > H2, that is, the second guide section has a deeper insertion depth, which enhances the anti-backflow effect of the impeller leading edge.

[0020] Preferably, H4 = H2 + a, 0mm < a < 5mm, where a mainly controls the depth of the collector into the impeller. If the impeller is inserted too deeply, there is a risk of interference with the impeller during operation.

[0021] The second technical solution adopted by this utility model to solve the first technical problem is as follows: that is, as a variation of a collector for a fan system, the collector is set at the air inlet of the fan system and includes: a guide section; the guide section includes a first guide section and a second guide section, the second guide section is connected to the first guide section through a transition section, the transition section extends from the connection point with the first guide section in a direction away from the first guide section and connects with the second guide section, so that the second guide section is located entirely in the airflow channel of the collector for external airflow to enter the fan system.

[0022] This design also allows the second guide section to have a higher guide height, increasing the turning radius and thus enhancing the guide effect, and / or to have a smaller inner diameter / deeper insertion depth, thereby enhancing the anti-backflow effect of the impeller leading edge. The higher guide height, smaller inner diameter, or deeper insertion depth formed by the second guide section through the "transition section" method can improve the inlet leakage backflow problem, thereby better guiding the airflow into the volute, improving fan efficiency, and reducing noise.

[0023] As an improvement, an annular mounting section is also included, which has a central axis. The second guide section includes a left guide section and a right guide section. Using the vertical plane of the central axis of the annular mounting section as a reference plane, the left guide section is located to the left of the reference plane, and the right guide section is located to the right of the reference plane. The second guide section is located in the bottom region. The airflow at the bottom inlet of the collector is larger than that at the top inlet. A larger airflow requires a larger turning radius for the collector, resulting in better guiding performance. Therefore, the above arrangement is adopted. The left and right guide sections can be arranged symmetrically or asymmetrically relative to the reference plane.

[0024] As an improvement, the central angle of the left guide section centered on the central axis of the annular mounting part is denoted as α, and the central angle of the right guide section centered on the central axis of the annular mounting part is denoted as β, where α > β. Considering that the lower left side of the collector is closer to the volute outlet, the inlet airflow of the collector is larger than that on the right side. The larger the airflow, the larger the turning radius of the collector is required, and the better its guiding effect will be. Therefore, the above setting is adopted: α > β.

[0025] As an improvement, an annular mounting section is also included, which has a central axis. The central angle formed by the second guide section relative to the central axis of the annular mounting section is denoted as S, and the value of S ranges from 30° to 180°. The bottom area is where the airflow is relatively concentrated. To ensure a large turning radius at the bottom, the second guide section should not be too small, and its central angle should be greater than 30°. However, it is also not advisable to adopt a structure with a large turning radius for the second guide section for the entire collector, as this would result in an excessively small air inlet size, affecting the overall air intake efficiency. Therefore, S should be at least less than 180°.

[0026] In this application, the transition section connecting the second guide section and the first guide section can be a curved portion extending radially along the collector, or it can be a gradually transitioning curved surface structure, meaning that the curved surface structure also has a certain angular range relative to the central axis of the collector in the circumferential direction. Specifically, the central angle formed by the second guide section relative to the central axis of the annular mounting portion should refer to the central angle formed by the two circumferentially distant end regions or positions of the second guide section relative to the central axis of the annular mounting portion.

[0027] To further improve the turbulence intensity inside the volute, the left and right guide sections should be concentrated at the bottom as much as possible, with 90°≥α>β≥15°.

[0028] As an improvement, opposite first and second directions are formed along the central axis of the annular mounting portion, with the second direction being the direction of the oil fume flow path. The guide portion also includes a radial guide portion that extends radially inward from the inner side of the annular mounting portion and bends and protrudes in the first direction. The protrusion height of the radial guide portion of the first guide section relative to the annular mounting portion along the first direction is denoted as H1, and the protrusion height of the radial guide portion of the second guide section relative to the annular mounting portion along the first direction is denoted as H3, where H3 > H1, that is, in the radial direction, the air guiding height from the second guide section is higher, thereby increasing the turning radius and enhancing the guiding effect.

[0029] Preferably, H1 < H3 < 1.5H1. When H3 ≥ 1.5H1, the guide section is too high, which will affect the front air intake space and increase the hollow area between the collector and the impeller end, which is not conducive to the backflow control of the impeller leading edge.

[0030] Further improvements include an axial flow guide extending from the inner side of the radial flow guide along a second direction; the distance between any point on the axial flow guide of the first flow guide section and the central axis of the annular mounting section is denoted as R1, and the distance between any point on the axial flow guide of the second flow guide section and the central axis of the annular mounting section (21) is denoted as R2, wherein R2 < R1, that is, the second flow guide section has a smaller inner diameter, which enhances the anti-backflow effect of the impeller leading edge.

[0031] Preferably, 0.85R1 < R2 < 0.95R1 means that when R2 ≤ 0.85R1, the inner diameter of the corresponding area of ​​the collector is small, the air inlet space of the collector is reduced, and the hollow area between the collector and the impeller end will also increase, which is not conducive to the backflow control of the impeller leading edge. On the other hand, when R2 ≥ 0.95R1, it means that the difference between the inner diameter of the collector and the overall inner diameter is small, the radial clearance between the collector and the impeller is reduced, and it cannot play a good anti-backflow effect. At the same time, the curvature of the arc-shaped guide section is too large, and the guiding effect is also affected.

[0032] As an improvement, the distance between the side edge of the axial guide portion of the first guide section away from the annular mounting portion and the annular mounting portion in the direction of extension of the central axis is denoted as H2, and the distance between the side edge of the axial guide portion of the second guide section away from the annular mounting portion and the annular mounting portion in the direction of extension of the central axis is denoted as H4, wherein H4 > H2, that is, the second guide section has a deeper insertion depth, which enhances the anti-backflow effect of the impeller leading edge.

[0033] Preferably, H4 = H2 + a, 0mm < a < 5mm, where a mainly controls the depth of the collector into the impeller. If the impeller is inserted too deeply, there is a risk of interference with the impeller during operation.

[0034] The technical solution adopted by this utility model to solve the second technical problem is: a fan system, including a volute, an air inlet is provided on the volute, and a collector is provided at the air inlet, wherein the collector adopts the above-mentioned collector.

[0035] As an improvement, the air outlet of the volute faces upward, and at least a portion of the second guide section is located in the circumferential bottom region of the collector.

[0036] The technical solution adopted by this utility model to solve the third technical problem is: a range hood, including a fan system, wherein the fan system adopts the above-mentioned fan system.

[0037] Compared with the prior art, the advantages of this utility model are as follows: For the fan system placed inside the range hood casing, that is, to improve the airflow from the casing into the fan in the limited space, this utility model designs the flow guide part of the collector as a first flow guide section and a second flow guide section connected in sequence in its circumference. The second flow guide section protrudes from the first flow guide section, or the two are connected by a transition section. The transition section extends away from the first flow guide section from the point of connection with the first flow guide section and connects with the second flow guide section. In this way, the flow guide dimensions of the first flow guide section and the second flow guide section are different (including flow guide height, radial dimension, insertion depth, etc.), so as to improve the inlet leakage backflow problem from different dimensions, better guide the airflow into the volute, and further effectively improve the turbulence intensity at the bottom of the volute, thereby improving the fan efficiency and reducing noise. Attached Figure Description

[0038] Figure 1 This is a three-dimensional structural diagram of the fan system according to an embodiment of the present utility model;

[0039] Figure 2 This is a front view of the fan system according to an embodiment of the present utility model;

[0040] Figure 3 for Figure 2 A sectional view of the fan system in the image, cut along the AA direction;

[0041] Figure 4 This is a three-dimensional structural diagram of the current collector according to an embodiment of the present utility model;

[0042] Figure 5 This is a front view of the current collector according to an embodiment of the present utility model;

[0043] Figure 6 for Figure 5 A cross-sectional view of the collector in the image, cut along the AA direction;

[0044] Figure 7 for Figure 5 A cross-sectional view of the collector along the BB direction;

[0045] Figure 8 for Figure 5 The front view of the cross-section of the collector along the AA direction;

[0046] Figure 9 This is a schematic diagram comparing the turbulent kinetic energy of the flow field at different axial positions of the fan system of this utility model and the existing fan system. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0048] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0049] Figures 1-9 This illustration shows a preferred embodiment of the fan system collector, fan system, and range hood of this utility model. The range hood includes a housing and a fan system disposed within the housing; in this embodiment, the fan system is a centrifugal fan. The housing generally includes a fan frame and a smoke collection hood disposed at the bottom of the fan frame, with the inner cavity of the fan frame communicating with the inner cavity of the smoke collection hood. An air intake is provided on the front side wall of the smoke collection hood, through which external smoke can enter the smoke collection hood. The centrifugal fan is disposed within the fan frame; when the centrifugal fan operates, it generates negative pressure, allowing external fumes to be drawn into the smoke collection hood through the air intake.

[0050] The centrifugal fan includes a volute 10, an impeller 14, and a motor 15 for driving the impeller 14 to rotate. The volute 10 includes a front cover plate 11, a rear cover plate 12, and an annular wall 13 connecting the front cover plate 11 and the rear cover plate 12. The two ends of the annular wall 13, together with the front cover plate 11 and the rear cover plate 12, define an outlet 100 for the airflow of the volute 10. An inlet 110 is provided on the front cover plate 11 of the volute 10. The impeller 14 is located inside the volute 10, and the front end of the impeller 14 is opposite to the outlet 100. A collector 2 is also provided at the inlet 110 of the volute 10. For the centrifugal fan, the collector 2 plays a guiding role and has a decisive effect on the inlet airflow conditions of the impeller 14, thereby affecting the aerodynamic performance of the internal flow field of the impeller 14 and the actual operating performance of the fan.

[0051] Since the fan system is located inside the range hood casing, in order to effectively improve the airflow in the limited space from the casing into the fan, this embodiment has made adaptive improvements to the collector. Specifically, the collector 2 includes an annular mounting part 21 and a guide part. The annular mounting part 21 has a central axis, which is basically collinear with the axis of the impeller 14. Opposite directions A1 and A2 are formed along the central axis, where the second direction A2 is the direction of the oil fume flow path. It should be noted that the example mounting part is annular, so the central axis is referenced to the annular mounting part 21. If the mounting part is not annular, the central axis of the guide part can be used as the reference. Those skilled in the art can usually understand that when the mounting part is annular, it shares the same central axis with the guide part. That is, the central axis necessarily exists for the guide part and will not affect the essence of the solution due to changes in the shape of the mounting part.

[0052] The flow guide includes a radial flow guide 22 and an axial flow guide 23, wherein the radial flow guide 22 extends radially inward from the inner side of the annular mounting portion 21 and bends and protrudes in the first direction A1, as shown below. Figure 6 As shown, the cross-section of the radial guide portion 22 is arc-shaped with its opening facing into the volute 10. The axial guide portion 23 is a section extending from the inner side of the radial guide portion 22 along the second direction A2.

[0053] The air outlet 100 of the volute 10 faces upward, and the air inlet 110 faces forward. Using the vertical plane of the central axis of the annular mounting portion 21 of the collector as a reference plane, the air outlet 100 is positioned slightly to the left relative to the reference plane. The guide section of this embodiment includes a first guide section 241 and a second guide section 242 connected sequentially in its circumferential direction. The second guide section 242 is located at the bottom, and the central angle formed by the second guide section 242 relative to the central axis of the annular mounting portion 21 is denoted as S, where S ranges from 30° to 180°. The reference plane divides the second guide section 242 into a left guide section and a right guide section. The central angle of the left guide section centered on the central axis of the annular mounting portion 21 is denoted as α, and the central angle of the right guide section centered on the central axis of the annular mounting portion 21 is denoted as β, where 90° ≥ α > β ≥ 15°. Because the lower left side of the collector is close to the outlet of the volute 10, the inlet air flow of the collector is larger than that on the right side. The larger the air flow, the larger the turning radius of the collector is required, and the better its guiding effect will be. Therefore, the above setting is adopted: α > β.

[0054] pass Figure 4 and Figure 5As can be seen, in this embodiment, the second guide section 242 protrudes beyond the first guide section 241. The "protruding" in "the second guide section 242 protrudes beyond the first guide section 241" can be understood as the second guide section 242 being far from the first guide section 241, and the second guide section 242 being entirely located within the airflow channel from the collector into the fan. According to... Figure 4 The second guide section 242 is connected to the first guide section 241 via a transition section 243. The transition section 243 extends away from the first guide section 241 from its connection point and connects with the second guide section 242, so that the second guide section 242 is entirely located within the airflow channel of the collector for external airflow to enter the fan system. That is, "away" refers to the way the second guide section 242 is moved away while still remaining entirely within the airflow channel.

[0055] The aforementioned "protruding structure" or "transition section 243" design can enable the second guide section 242 to have a higher guide height, thereby increasing the turning radius and enhancing the guide effect, and / or enable the second guide section 242 to have a smaller inner diameter / deeper insertion depth, thereby enhancing the anti-backflow effect of the impeller leading edge. The higher guide height, smaller inner diameter, or deeper insertion depth of the second guide section 242 can improve the inlet leakage backflow problem, thereby better guiding the airflow into the volute, improving the fan efficiency, and reducing noise.

[0056] The transition section 243 connecting the second guide section 242 and the first guide section 241 can be a curved section extending radially along the collector, or it can be a gradually transitioning curved surface structure between the two, meaning that the curved surface structure also has a certain angular range relative to the central axis of the collector in the circumferential direction. The central angle formed by the second guide section relative to the central axis of the annular mounting portion should refer to the central angle formed by the two circumferentially distant end regions or positions of the second guide section relative to the central axis of the annular mounting portion.

[0057] It should be noted that the transition segment can be a transition segment with the same shape or a transition segment with a different shape. As an example, this embodiment only shows the solution with the same shape, but it is not intended to limit the shape.

[0058] See Figure 8The protrusion height of the radial guide portion 22 of the first guide section 241 relative to the annular mounting portion 21 along the first direction A1 is denoted as H1. The distance between the side edge of the axial guide portion 23 of the first guide section 241 away from the annular mounting portion 21 and the annular mounting portion 21 in the direction of extension of the central axis is denoted as H2. The distance between the axial guide portion 23 of the first guide section 241 and the central axis of the annular mounting portion 21 is denoted as R1. The protrusion height of the radial guide portion 22 of the second guide section 242 relative to the annular mounting portion 21 along the first direction A1 is denoted as H3. The distance between the side edge of the axial guide portion 23 of the second guide section 242 away from the annular mounting portion 21 and the annular mounting portion 21 in the direction of extension of the central axis is denoted as H4. The distance between the axial guide portion 23 of the first guide section 241 and the central axis of the annular mounting portion 21 is denoted as R2. Wherein, H3 > H1, H4 > H2, and R2 is less than R1. Specifically, under normal circumstances, in order to ensure the intake air volume and avoid interference with other components, the above parameters H1, H2, H3, H4, R1, and R2 must meet the following conditions: H1 < H3 < 1.5H1; H4 = H2 + a, 0mm < a < 5mm; 0.85R1 < R2 < 0.95R1, the value range of H1 is 5mm ≤ H1 ≤ 15mm, and the value range of H2 is 5mm ≤ H2 ≤ 20mm.

[0059] The inner radius of the impeller 14 of the fan system is R. R1 and R satisfy the condition: R1 = Rt, where t = 5~20mm. The distance between the inner edge of the annular mounting portion 21 and its central axis is denoted as R0, where R0 = (1.1~1.4)*R1. The distance by which the axial guide portion 23 of the first guide section 241 extends from its radial guide portion 22 along the second direction A2 is denoted as L1, and the value of L1 ranges from 0mm < L1 < 6mm. The distance by which the axial guide portion 23 of the second guide section 242 extends from its radial guide portion 22 along the second direction A2 is denoted as L2, and the value of L2 is basically the same as L1.

[0060] See also Figure 6 and Figure 7The outline of the cross-section of the radial guide portion 22 of the first guide section 241 is denoted as the first outline. A point on the first outline that connects with the annular mounting portion 21 is denoted as A, and a point on the first outline that connects with the axial guide portion 23 is denoted as C. The point on the first outline furthest from the annular mounting portion 21 along the first direction A1 is denoted as B. A point on the first outline corresponding to the end position of the axial guide portion is denoted as D. A point on the arc segment formed between points A and B on the first outline is denoted as point M. Correspondingly, the outline of the cross-section of the radial guide portion 22 of the second guide section 242 is denoted as the second outline. The second outline is set based on the guiding characteristics of the first outline and has a certain relationship to ensure optimal guiding and anti-backflow effects. The second outline and the annular... The point where the annular mounting part 21 is connected is denoted as A', the point where it is connected to the axial guide part 23 is denoted as C', the point on the second contour line that is farthest from the annular mounting part 21 along the first direction A1 is denoted as B', the point on the second contour line corresponding to the end position of the axial guide part is denoted as D', and the point on the arc segment formed between point A' and point B' on the second contour line is denoted as point M'. The radius of curvature of the arc segment AM on the first contour line is the same as the radius of curvature of the arc segment A'M' on the second contour line, the radius of curvature of the arc segment M'B' on the second contour line is greater than the radius of curvature of the arc segment MB on the first contour line, and the radius of curvature of the arc segment B'C' on the second contour line is also greater than the radius of curvature of the arc segment BC on the first contour line. The aforementioned structural design makes the guiding characteristics of the second guide section different from those of the first guide section in both the axial and radial directions. The guide height of the second guide section is higher (i.e., H1 is less than H3), increasing the turning radius and enhancing the guiding effect. Furthermore, the second guide section has a smaller inner diameter (i.e., R2 is less than R1) and a deeper insertion depth (i.e., H4 is greater than H2), strengthening the anti-backflow effect at the leading edge of the impeller 14. The collector in this embodiment simultaneously improves the inlet leakage and backflow problem in three dimensions: axial, radial, and circumferential. It can better guide the airflow into the interior of the volute 10 and further effectively improve the turbulence intensity below the interior of the volute 10, thereby improving fan efficiency and reducing noise. Based on this, the structural design that the radius of curvature of the arc segment AM on the first contour line is the same as the radius of curvature of the arc segment A'M' on the second contour line can make the airflow more stable during the initial flow process, avoid serious flow separation problems caused by the large difference between the radii of curvature of the first contour line and the second contour line, and ensure that the airflow can be guided into the volute 10 more smoothly.

[0061] Generally, the length ratio of the arc segment AM on the first profile line should be reasonably limited. If the arc length ratio of the arc segment AM on the first profile line is too large, the second guide section cannot effectively increase the turning radius, which is not conducive to improving the guiding effect. If the arc length ratio of the arc segment AM on the first profile line is too small, the overlap area between the second guide section and the first guide section is small, and the airflow is unstable in the initial flow process, which cannot smoothly guide the airflow into the interior of the volute 10. Therefore, the arc length of the arc segment AM on the first profile line is denoted as L. AM The arc length of the arc segment AB on the first contour line is denoted as L. AB , where 0 < L AM <0.5L AB .

[0062] See also Figure 8 The angle formed by the intersection of the straight line segment on the first contour line of the first guide section 241 corresponding to the axial guide section 23 and the plane where the annular mounting section 21 is located is denoted as ω1. The angle formed by the intersection of the straight line segment on the second contour line of the second guide section 242 corresponding to the axial guide section 23 and the plane where the annular mounting section 21 is located is denoted as ω2. The values ​​of ω1 and ω2 are both in the range of 90° to 110°.

[0063] Figure 9 This diagram illustrates a comparison of the turbulent kinetic energy of the fan system of this embodiment and a conventional fan system at different axial positions in cross-section. Z represents the axial direction of the impeller 14, with the origin located on the rear cover plate 12 of the volute 10. Due to the influence of the airflow turning radius and leakage between the collector and the impeller 14, the main air intake area of ​​the impeller 14 is at the middle Z=85mm. As can be seen from the diagram, the red high-intensity turbulent kinetic energy (TKE) inside the lower edge of the volute 10 (corresponding to the dual-diameter section of the collector) and at the outlet is significantly reduced in this embodiment. Even in the non-mainstream area, the red high-intensity turbulent kinetic energy in the cross-section near the collector Z=150 and other cross-sections is also reduced. This indicates that the dual-intensity collector helps to improve the turbulence intensity inside the volute 10. Low turbulence intensity indicates fewer vortices inside the volute 10, thus improving the fan's working efficiency.

Claims

1. A collector for a fan system, disposed at the air inlet (110) of the fan system, comprising: Guide section; The feature is that the flow guiding part includes a first flow guiding section (241) and a second flow guiding section (242), and the second flow guiding section (242) protrudes from the first flow guiding section (241).

2. The collector for a wind turbine system according to claim 1, characterized in that: It also includes an annular mounting portion (21) having a central axis. The second guide section (242) includes a left guide section (2421) and a right guide section (2422). The vertical plane of the central axis of the annular mounting portion (21) is used as a reference plane. The left guide section (2421) is located to the left of the reference plane, and the right guide section (2422) is located to the right of the reference plane. The second guide section (242) is located in the bottom region.

3. The collector for a wind turbine system according to claim 2, characterized in that: The central angle of the left guide section with the central axis of the annular mounting part (21) as the center is denoted as α, and the central angle of the right guide section with the central axis of the annular mounting part (21) as the center is denoted as β, where α > β.

4. The collector for a wind turbine system according to claim 1, characterized in that: It also includes an annular mounting part (21), which has a central axis. The central angle formed by the second guide section (242) relative to the central axis of the annular mounting part (21) is denoted as S. The value range of S is 30° < S < 180°.

5. The collector for a wind turbine system according to claim 3, characterized in that: 90°≥α＞β≥15°。 6. The collector for a wind turbine system according to any one of claims 2-5, characterized in that: A first direction (A1) and a second direction (A2) are formed along the central axis of the annular mounting portion (21), with the second direction (A2) being the direction of the oil fume flow path; the guide portion also includes a radial guide portion (22) that extends radially inward from the inner side of the annular mounting portion (21) and bends and protrudes in the first direction (A1); The protrusion height of the radial guide portion (22) of the first guide section (241) relative to the annular mounting portion (21) along the first direction (A1) is denoted as H1, and the protrusion height of the radial guide portion (22) of the second guide section (242) relative to the annular mounting portion (21) along the first direction (A1) is denoted as H3, where H3 > H1.

7. The collector for a wind turbine system according to claim 6, characterized in that: H1 < H3 < 1.5H1.

8. The collector for a wind turbine system according to any one of claims 2-5, characterized in that: The flow guide also includes an axial flow guide (23) extending along the second direction (A2) from the inner side of the radial flow guide (22); The distance between any point on the axial guide portion (23) of the first guide section (241) and the central axis of the annular mounting portion (21) is denoted as R1, and the distance between any point on the axial guide portion (23) of the second guide section (242) and the central axis of the annular mounting portion (21) is denoted as R2, where R2 < R1.

9. The collector for a wind turbine system according to claim 8, characterized in that: 0.85R1 < R2 < 0.95R1.

10. The collector for a wind turbine system according to any one of claims 2-5, characterized in that: The flow guide also includes an axial flow guide (23) extending along the second direction (A2) from the inner side of the radial flow guide (22); The distance between the side edge of the axial flow guide portion (23) of the first flow guide section (241) away from the annular mounting portion (21) and the annular mounting portion (21) in the direction of extending the central axis is denoted as H2, and the distance between the side edge of the axial flow guide portion (23) of the second flow guide section (242) away from the annular mounting portion (21) and the annular mounting portion (21) in the direction of extending the central axis is denoted as H4, where H4 > H2.

11. The collector for a wind turbine system according to claim 10, characterized in that: H4 = H2 + a, 0mm < a < 5mm.

12. A collector for a fan system, disposed at the air inlet (110) of the fan system, comprising: Guide section; The feature is that the flow guiding section includes a first flow guiding section (241) and a second flow guiding section (242); The second guide section (242) is connected to the first guide section (241) through a transition section (243). The transition section (243) extends from the connection point with the first guide section (241) in a direction away from the first guide section (241) and connects with the second guide section, so that the second guide section (242) is located entirely in the airflow channel of the collector for external airflow to enter the fan system.

13. The collector for a wind turbine system according to claim 12, characterized in that: It also includes an annular mounting portion (21) having a central axis. The second guide section (242) includes a left guide section (2421) and a right guide section (2422). The vertical plane of the central axis of the annular mounting portion (21) is used as a reference plane. The left guide section (2421) is located to the left of the reference plane, and the right guide section (2422) is located to the right of the reference plane. The second guide section (242) is located in the bottom region.

14. The collector for a wind turbine system according to claim 13, characterized in that: The central angle of the left guide section with the central axis of the annular mounting part (21) as the center is denoted as α, and the central angle of the right guide section with the central axis of the annular mounting part (21) as the center is denoted as β, where α > β.

15. The collector for a wind turbine system according to claim 12, characterized in that: It also includes an annular mounting part (21), which has a central axis. The central angle formed by the second guide section (242) relative to the central axis of the annular mounting part (21) is denoted as S. The value range of S is 30° < S < 180°.

16. The collector for a wind turbine system according to claim 15, characterized in that: 90°≥α＞β≥15°。 17. The collector for a wind turbine system according to any one of claims 13-16, characterized in that: A first direction (A1) and a second direction (A2) are formed along the central axis of the annular mounting portion (21), with the second direction (A2) being the direction of the oil fume flow path; the guide portion also includes a radial guide portion (22) that extends radially inward from the inner side of the annular mounting portion (21) and bends and protrudes in the first direction (A1); The protrusion height of the radial guide portion (22) of the first guide section (241) relative to the annular mounting portion (21) along the first direction (A1) is denoted as H1, and the protrusion height of the radial guide portion (22) of the second guide section (242) relative to the annular mounting portion (21) along the first direction (A1) is denoted as H3, where H3 > H1.

18. The collector for a wind turbine system according to claim 17, characterized in that: H1 < H3 < 1.5H1.

19. The collector for a wind turbine system according to any one of claims 13-16, characterized in that: The flow guide also includes an axial flow guide (23) extending along the second direction (A2) from the inner side of the radial flow guide (22); The distance between any point on the axial guide portion (23) of the first guide section (241) and the central axis of the annular mounting portion (21) is denoted as R1, and the distance between any point on the axial guide portion (23) of the second guide section (242) and the central axis of the annular mounting portion (21) is denoted as R2, where R2 < R1.

20. The collector for a wind turbine system according to claim 19, characterized in that: 0.85R1 < R2 < 0.95R1.

21. The collector for a wind turbine system according to any one of claims 13-16, characterized in that: The flow guide also includes an axial flow guide (23) extending along the second direction (A2) from the inner side of the radial flow guide (22); The distance between the side edge of the axial flow guide portion (23) of the first flow guide section (241) away from the annular mounting portion (21) and the annular mounting portion (21) in the direction of extending the central axis is denoted as H2, and the distance between the side edge of the axial flow guide portion (23) of the second flow guide section (242) away from the annular mounting portion (21) and the annular mounting portion (21) in the direction of extending the central axis is denoted as H4, where H4 > H2.

22. The collector for a wind turbine system according to claim 21, characterized in that: H4 = H2 + a, 0mm < a < 5mm.

23. A fan system, comprising a volute (10), wherein an air inlet (110) is provided on the volute (10), and a collector is provided at the air inlet (110), characterized in that: The collector described herein is the collector for a wind turbine system as described in any one of claims 1 to 22.

24. The fan system according to claim 23, characterized in that: The air outlet (100) of the volute (10) faces upward, and at least a portion of the second guide section (242) is located in the circumferential bottom region of the collector.

25. A range hood, comprising a fan system, characterized in that: The fan system described in claim 23 or 24 is the fan system described in claim 23 or 24.

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