Collectors, centrifugal fans and air conditioners
By setting staggered inner and outer flow guiding structures on the inner and outer walls of the collector, the problem of high noise in the impeller inlet area of the centrifugal fan was solved, achieving a reduction in noise and vibration, an improvement in flow conditions, and an increase in air volume.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GREE ELECTRIC APPLIANCE INC OF ZHUHAI
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-03
AI Technical Summary
Existing centrifugal fans have high noise levels in the impeller inlet area. The airflow in the impeller inlet area forms a strong impact and a complex flow state, resulting in noise and vibration problems.
An inner guide structure and an outer guide structure are set on the inner and outer walls of the collector. The inner guide channel and the outer guide channel are arranged alternately. The inner guide channel disperses the airflow into multiple small airflows, and the outer guide channel divides the secondary flow, changing the airflow impact position and path, and weakening the sound pressure superposition and turbulence intensity.
The design of the internal and external flow guiding structure reduces noise and vibration in the impeller inlet area, improves the flow state, and enhances the stability and air volume of the fan.
Smart Images
Figure CN224453196U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of fans, and more particularly to a collector, a centrifugal fan and an air conditioner. Background Technology
[0002] Centrifugal fans consist of an impeller, a volute, and a collector, with the collector smoothly guiding the airflow to the impeller. However, when gas flows from the collector to the impeller, the airflow strongly impacts the impeller's inlet area. Simultaneously, the presence of secondary flow vortices in the impeller inlet area creates a complex flow pattern, resulting in loud aerodynamic noise. Utility Model Content
[0003] This application provides a collector, a centrifugal fan, and an air conditioner to solve the problem of high noise in the impeller inlet area of existing centrifugal fans.
[0004] In a first aspect, this application provides a current collector, comprising:
[0005] A flow collector ring, comprising a flow collector inlet and a flow collector outlet arranged opposite to each other in the axial direction;
[0006] An internal flow guiding structure is disposed on the inner wall of the collecting ring. The internal flow guiding structure includes a plurality of internal flow guiding grooves arranged circumferentially around the collecting ring, the internal flow guiding grooves extending from the collecting air inlet to the collecting air outlet; and
[0007] An external flow guiding structure is disposed on the outer wall of the flow collecting ring. The external flow guiding structure includes a plurality of external flow guiding grooves arranged circumferentially around the flow collecting ring. The external flow guiding grooves extend from the flow collecting inlet to the flow collecting outlet. The external flow guiding grooves and the internal flow guiding grooves are arranged alternately in the circumferential direction of the flow collecting ring.
[0008] In some embodiments, the inner flow guiding structure includes an inner end face profile and a plurality of inner flow guiding ridges. The plurality of inner flow guiding ridges are arranged circumferentially around the flow collecting ring. The inner flow guiding ridges and the inner flow guiding groove are continuously and alternately arranged circumferentially to form a periodically undulating inner end face profile.
[0009] The external flow guiding structure includes an outer end face profile and multiple external flow guiding ridges. The multiple external flow guiding ridges are arranged circumferentially around the flow collecting ring. The external flow guiding ridges and the external flow guiding grooves are continuously and alternately arranged in the circumferential direction to form a periodically undulating outer end face profile. The internal flow guiding grooves are located between two adjacent external flow guiding grooves in the circumferential direction, and the external flow guiding grooves are located between two adjacent internal flow guiding grooves in the circumferential direction.
[0010] In some embodiments, the inner end face profile and the outer end face profile are both sinusoidal periodic curves with the same phase, wherein the peak of the inner end face profile and the trough of the outer end face profile are in the same phase.
[0011] In some embodiments, the internal flow guiding structure includes an internal flow guiding profile, the internal flow guiding profile comprising:
[0012] First guide profile;
[0013] The second guide profile intersects the first guide profile at the air inlet at one end; wherein the radial distance between the second guide profile and the first guide profile gradually increases in the airflow inlet direction.
[0014] In some embodiments, the first guide profile includes:
[0015] The dominant flow pattern segment is located at the air inlet of the collection chamber. The dominant flow pattern segment is arc-shaped and its center of curvature is located outside the collection chamber. The dominant flow pattern segment is constructed such that one end can be tangent to the side wall of the volute.
[0016] A secondary guide line segment is located at the air outlet of the collector. The secondary guide line segment is a straight line and is inclined to the end face of the collector ring. One end of the secondary guide line segment is tangentially connected to the end of the primary guide line segment away from the air inlet of the collector.
[0017] In some embodiments, the angle between the secondary guide line segment and the end face of the collector coil is 80°-90°.
[0018] In some embodiments, the outer guide structure includes an outer guide profile that is parallel to the inner guide profile and has an offset spacing in the radial direction.
[0019] In some embodiments, the inner end face profile satisfies the following formula:
[0020]
[0021] Where R is the radius of the inner end face profile; R0 is the radius of the inner base circle; a is the radial amplitude; n is the number of inner guide grooves; and t is the coordinate of the point corresponding to the inner end face profile.
[0022] In some embodiments, the radial amplitude a and the inner base circle radius R0 satisfy the following relationship: 0.01≤a / R0≤0.03.
[0023] In some embodiments, the coordinate t satisfies the following relationship: 0 ≤ t ≤ 1.
[0024] In some embodiments, the point includes a starting point, an ending point, and a target point. The central angle between the starting point and the ending point is 360°. The target point is located between the starting point and the ending point, and the central angle between the target point and the starting point is α. The coordinates of the starting point are 0 and 1, and the coordinates t of the target point satisfy the following relationship: t = α / 360°.
[0025] Secondly, this application provides a centrifugal fan, comprising:
[0026] The volute has at least one air inlet in the axial direction;
[0027] The impeller is rotatably disposed within the volute; and
[0028] The collector described above is disposed at the air inlet; wherein the inner guide profile of the collector is tangent to the side wall of the volute.
[0029] Thirdly, this application provides an air conditioner, including the centrifugal fan described above.
[0030] The technical solutions provided in this application have the following advantages compared with the prior art:
[0031] The collector provided in this application embodiment, on the one hand, by setting an internal flow guiding structure on the inner wall of the collector, can not only smoothly guide the inlet airflow entering from the collector inlet to the impeller, but also change the impact position and flow path of the airflow on the impeller in the circumferential direction, thereby disrupting the sound pressure superposition of the airflow in the circumferential direction, weakening the impact of the airflow on the impeller end face, and improving the complex flow state in the impeller inlet area. Specifically, multiple internal flow guiding grooves are used to divert the airflow into multiple small airflows distributed in the circumferential direction, which uniformly impact different positions of the impeller in the circumferential direction, avoiding excessive impact in local areas of the impeller, breaking the periodic impact mode of the airflow on the impeller 2 in the circumferential direction, and thus disrupting the sound pressure superposition effect of the airflow in the circumferential direction. Moreover, the multiple small airflows act on the impeller asynchronously, so that the pressure fluctuations of each small airflow have different phases in the circumferential direction, which can interfere with and cancel each other, thereby reducing the circumferential sound pressure and reducing noise and vibration. On the other hand, by setting an external flow guide structure on the outer wall of the collector, the secondary flow entering from between the impeller end face and the collector end face is guided and divided. By utilizing the staggered design of the external and internal flow guide grooves, the secondary flow and the inlet airflow are effectively separated, avoiding the mixing and convergence of the secondary flow and the inlet airflow. This weakens the turbulence intensity of the convergence of the secondary flow and the inlet airflow, improves the complex flow state in the impeller inlet area, and achieves noise reduction. Attached Figure Description
[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.
[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0034] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.
[0035] Figure 1 This is a three-dimensional structural diagram of the current collector provided in an embodiment of this application;
[0036] Figure 2 A top view of the current collector provided in an embodiment of this application;
[0037] Figure 3 for Figure 2 Enlarged view of section A;
[0038] Figure 4 for Figure 2 A cross-sectional view along the AA direction;
[0039] Figure 5 for Figure 4 Enlarged view of section B;
[0040] Figure 6 A three-dimensional structural schematic diagram of the centrifugal fan provided in the embodiments of this application;
[0041] Figure 7 A top view of a centrifugal fan provided in an embodiment of this application;
[0042] Figure 8 for Figure 7 A cross-sectional view along the BB direction;
[0043] Figure 9 for Figure 8 Enlarged view of section C;
[0044] Figure 10 The noise curves of the centrifugal fan provided in the embodiments of this application and the centrifugal fans of the prior art under different air volumes are shown.
[0045] Explanation of reference numerals in the attached figures:
[0046] 1. Collector; 2. Impeller; 3. Volute; 4. Outlet; 5. Sidewall;
[0047] 10. Collector coil; 110. Collector air inlet; 120. Collector air outlet;
[0048] 20. Internal guide structure; 210. Internal guide groove; 220. Internal end face profile; 230. Internal guide ridge; 240. Internal guide profile; 2401. First guide profile; 2402. Second guide profile; 2403. Main guide profile segment; 2404. Secondary guide profile segment; 2405. Upstream guide profile segment; 2406. Downstream guide profile segment; 250. Inner base circle;
[0049] 30. External guide structure; 310. External guide groove; 320. External end face profile; 330. External guide ridge; 340. External guide profile; 3401. Third guide profile. Detailed Implementation
[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0051] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.
[0052] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.
[0053] Centrifugal fans are machines that use input mechanical energy to increase gas pressure and discharge gas, and are widely used in household appliances such as air conditioners. A centrifugal fan consists of an impeller, a volute, and a collector. The collector smoothly guides the airflow to the impeller. For example, the collector in a multi-blade centrifugal fan uses a radially uniformly stacked arc-shaped structure. However, when gas flows from the collector to the impeller, the airflow strongly impacts the impeller's inlet area, causing loud aerodynamic noise. Simultaneously, due to the safety gap between the collector's end face and the impeller's end face, some of the airflow that has done work on the impeller flows axially within the volute cavity due to the pressure difference, and is drawn back into the impeller through the safety gap, forming a secondary flow that mixes with the inlet airflow. This results in secondary flow vortices in the impeller inlet area, making the flow state in the impeller inlet area very complex and further increasing noise.
[0054] In response to the above technical problems, such as Figure 1-3 As shown, this application embodiment provides a collector 1, including a collector ring 10, an inner guide structure 20, and an outer guide structure 30; the collector ring 10 includes a collector inlet 110 and a collector outlet 120 arranged opposite to each other in the axial direction; the inner guide structure 20 is disposed on the inner wall of the collector ring 10, and the inner guide structure 20 includes a plurality of inner guide grooves 210 arranged circumferentially around the collector ring 10, the inner guide grooves 210 extending from the collector inlet 110 to the collector outlet 120; the outer guide structure 30 is disposed on the outer wall of the collector ring 10, and the outer guide structure 30 includes a plurality of outer guide grooves 310 arranged circumferentially around the collector ring 10, the outer guide grooves 310 extending from the collector inlet 110 to the collector outlet 120; wherein, the outer guide grooves 310 and the inner guide grooves 210 are staggered in the circumferential direction of the collector ring 10.
[0055] As can be seen from the above, on the one hand, by setting an internal guide structure 20 on the inner wall of the collector 1, not only can the inlet airflow entering from the collector inlet 110 be smoothly guided to the impeller 2, but the impact position and flow path of the airflow on the impeller 2 in the circumferential direction can also be changed, thereby destroying the sound pressure superposition of the airflow in the circumferential direction, weakening the impact of the airflow on the end face of the impeller 2, and improving the complex flow state in the inlet area of the impeller 2. Specifically, multiple internal guide grooves 210 are used to divert the airflow and guide it into multiple small airflows distributed in the circumferential direction, which uniformly impact different positions of the impeller 2 in the circumferential direction, avoiding excessive impact in local areas of the impeller 2, breaking the periodic impact mode of the airflow on the impeller 2 in the circumferential direction, and thus destroying the sound pressure superposition effect of the airflow in the circumferential direction. Moreover, when multiple small airflows act on the impeller 2, they are asynchronous impacts, so that the pressure fluctuations of each small airflow present different phases in the circumferential direction, which can interfere with and cancel each other, thereby reducing the circumferential sound pressure and reducing noise and vibration. On the other hand, by setting an external guide structure 30 on the outer wall of the collector 1, the secondary flow entering from between the end face of the impeller 2 and the end face of the collector 1 is guided and diverted. By utilizing the staggered design of the external guide groove 310 and the inner guide groove 210, the secondary flow and the inlet airflow are effectively separated, avoiding the mixing and convergence of the secondary flow and the inlet airflow. This weakens the turbulence intensity of the convergence of the secondary flow and the inlet airflow, improves the complex flow state in the inlet area of the impeller 2, and achieves a noise reduction effect.
[0056] It should be noted that, as Figure 8 , Figure 9 As shown, since the impeller 2 is a moving part, while the volute 3 and the collector 1 are stationary parts, in order to avoid dynamic and static interference during the rotation of the impeller 2, a safety distance is usually set between the end faces of the impeller 2 and the collector 1. After the impeller 2 has done work, part of the outlet airflow flows axially in the cavity of the volute 3 due to the pressure difference, and is drawn back into the impeller 2 from the safety distance to form a secondary flow. This secondary flow mixes and merges with the inlet airflow flowing in from the collector inlet 110.
[0057] It should also be noted that the multiple inner guide channels 210 can be arranged at equal intervals or at unequal intervals in the circumferential direction; understandably, the multiple outer guide channels 310 can be arranged at equal intervals or at unequal intervals in the circumferential direction; in addition, the inner guide channels 210 and the outer guide channels 310 can be arranged in a one-to-one correspondence or a multi-to-one proportional staggered arrangement in the circumferential direction, or they can be randomly distributed non-periodic staggered arrangements.
[0058] It should also be noted that, such as Figure 4 As shown, the axial direction is parallel to the Z direction.
[0059] It should also be noted that the longitudinal section profile of the collector ring 10 is an arc shape and the center of curvature is located on the outside of the collector ring 10. The inner and outer diameters of the collector ring 10 gradually decrease along the airflow inlet direction.
[0060] like Figure 2 , Figure 3 As shown, in some embodiments, the inner flow guiding structure 20 includes an inner end face profile 220 and a plurality of inner flow guiding ridges 230. The plurality of inner flow guiding ridges 230 are arranged circumferentially around the flow collecting ring 10 at intervals. The inner flow guiding ridges 230 and the inner flow guiding groove 210 are continuously and alternately arranged in the circumferential direction to form a periodically undulating inner end face profile 220.
[0061] The outer flow guiding structure 30 includes an outer end face profile 320 and multiple outer flow guiding ridges 330. The multiple outer flow guiding ridges 330 are arranged circumferentially around the flow collecting ring 10. The outer flow guiding ridges 330 and the outer flow guiding grooves 310 are continuously and alternately arranged in the circumferential direction to form a periodically undulating outer end face profile 320. Among them, the inner flow guiding grooves 210 are located between two adjacent outer flow guiding grooves 310 in the circumferential direction, and the outer flow guiding grooves 310 are located between two adjacent inner flow guiding grooves 210 in the circumferential direction.
[0062] By continuously alternating the inner guide ridges 230 and inner guide channels 210 in the circumferential direction, the inner guide ridges 230 and inner guide channels 210 are staggered and continuous, thereby improving the flow field uniformity of the outer guide structure 30 during flow diversion and distribution. Similarly, by continuously alternating the outer guide ridges 330 and outer guide channels 310 in the circumferential direction, the outer guide ridges 330 and outer guide channels 310 are staggered and continuous, thereby improving the flow field uniformity of the outer guide structure 30 during flow diversion and distribution. Furthermore, by placing the inner guide channels 210 circumferentially between two adjacent outer guide channels 310, and the outer guide channels 310 circumferentially between two adjacent inner guide channels 210, the inner guide channels 210 and outer guide channels 310 are staggered in the circumferential direction, thereby optimizing stress distribution, ensuring the stability of the centrifugal fan operation, and extending the lifespan of the collector 1.
[0063] It should be noted that the cross-sectional shapes of the inner guide channel 210, inner guide ridge 230, outer guide channel 310, and outer guide ridge 330 include, but are not limited to, triangular, wavy, rectangular, and trapezoidal shapes, and the cross-sectional shapes of the inner guide channel 210, inner guide ridge 230, outer guide channel 310, and outer guide ridge 330 can be the same or different; and the cross-sectional dimensions of the inner guide channel 210, inner guide ridge 230, outer guide channel 310, and outer guide ridge 330 can be the same or different.
[0064] It should also be noted that the inner end face profile 220 is the projection line of the end face of the inner guide structure 20 on a plane perpendicular to the axial direction, and the outer end face profile 320 is the projection line of the end face of the outer guide structure 30 on a plane perpendicular to the axial direction; specifically, the inner end face profile 220 is the projection line through the air outlet end face of the inner guide structure 20, and the outer end face profile 320 refers to the projection line of the air outlet end face of the outer guide structure 30.
[0065] like Figure 2 , Figure 3 As shown, in some embodiments, the inner end face profile 220 and the outer end face profile 320 are both sinusoidal periodic curves with the same phase, wherein the peak of the inner end face profile 220 and the trough of the outer end face profile 320 are in the same phase.
[0066] By setting both the inner end face profile 220 and the outer end face profile 320 to be sinusoidal periodic curves with the same phase, and the peak of the inner end face profile 220 and the trough of the outer end face profile 320 to be in the same phase, the inner guide channel 210 of the inner guide structure 20 and the outer guide channel 310 of the outer guide structure 30 are out of phase by half a cycle. This ensures that the inlet airflow guided by the inner guide channel 210 and the secondary airflow guided by the outer guide channel 310 are staggered, effectively preventing them from impacting the same phase and reducing mutual interference.
[0067] It should be noted that since the inner guide channel 210, inner guide ridge 230, outer guide channel 310 and outer guide ridge 330 all extend from the air inlet 110 to the air outlet 120, and the extension paths of the inner guide channel 210 and inner guide ridge 230 are along the inner wall contour line of the longitudinal section of the air collecting ring 10, and the extension paths of the outer guide channel 310 and outer guide ridge 330 are along the outer wall contour line of the longitudinal section of the air collecting ring 10, the specific structures of the inner guide structure 20 and the outer guide structure 30 can be defined by defining the specific shapes of the inner end face profile 220 and the outer end face profile 320, respectively.
[0068] It should also be noted that the inner end face profile 220 is parallel to the outer end face profile 320. Thus, the inner end face profile 220 and the outer end face profile 320 are not only in phase, but the inner guide groove 210 and the outer guide ridge 330 are equal in length in the radial direction, and the inner guide ridge 230 and the outer guide groove 310 are equal in length in the radial direction.
[0069] like Figure 4As shown, in some embodiments, the inner guide structure 20 includes an inner guide profile 240, which includes a first guide profile 2401 and a second guide profile 2402; one end of the second guide profile 2402 intersects the first guide profile 2401 at the air inlet 110; wherein, the distance between the second guide profile 2402 and the first guide profile 2401 in the radial direction gradually increases in the airflow inlet direction.
[0070] Since the inner guide profile 240 is composed of the first guide profile 2401 and the second profile, and the first guide profile 2401 and the second guide profile 2402 are adjacent trough longitudinal section guide profiles and crest longitudinal section guide profiles respectively, by setting the distance between the second guide profile 2402 and the first guide profile 2401 in the radial direction to gradually increase with the airflow inlet direction, the depth of the inner guide groove 210 gradually increases in the airflow inlet direction. Thus, the axially gradually changing inner guide groove 210 can gradually disperse and guide the airflow into multiple small airflows.
[0071] It should be noted that the longitudinal section is obtained by cutting with a plane passing through the central axis of the collector ring 10 and parallel to the axial direction; therefore, it can be understood that the guide profile is the longitudinal section outline, for example, the inner guide profile 240 is the longitudinal section outline of the inner guide groove 210. Additionally, as... Figure 4 As shown, the central axis of the current collector 10 is a straight line O.
[0072] It should also be noted that, such as Figure 4 , Figure 5 As shown, the airflow direction is from the collecting air inlet 110 to the collecting air outlet 120. Therefore, at the collecting air inlet 110, the distance between the first guide line 2401 and the second guide line 2402 in the radial direction is zero, which is the minimum value. At the collecting air outlet 120, the distance between the first guide line 2401 and the second guide line 2402 in the radial direction is the maximum, which is a.
[0073] like Figure 4 , Figure 5 As shown, in some embodiments, the first guide line 2401 includes a main guide line segment 2403 and a secondary guide line segment 2404; the main guide line segment 2403 is located at the air inlet 110, the main guide line segment 2403 is arc-shaped and the center of curvature is located outside the air inlet ring 10, and the main guide line segment 2403 is constructed such that one end can be tangent to the side wall 5 of the volute 3; the secondary guide line segment 2404 is located at the air outlet 120, the secondary guide line segment 2404 is straight and inclined to the end face of the air inlet ring 10, and one end of the secondary guide line segment 2404 is tangently connected to the end of the main guide line segment 2403 away from the air inlet 110.
[0074] By setting the arc-shaped main flow profile segment 2403 to be tangentially connected to the straight secondary flow profile segment 2404, the first flow profile 2401 is smoothly transitioned, avoiding airflow separation and vortex loss, thereby reducing noise and improving fan efficiency. At the same time, by limiting one end of the arc-shaped main flow profile segment 2403 to be tangential to the side wall 5 of the volute 3, and the secondary flow profile segment 2404 to be inclined to the end face of the collector ring 10, the inner diameter of the first flow guide structure gradually decreases along the airflow direction, thereby gradually accelerating the airflow and further avoiding airflow separation and vortex generation.
[0075] It should be noted that, as Figure 4 , Figure 5 As shown, the second guide line 2402 includes an upstream guide line segment 2405 and a downstream guide line segment 2406. The upstream guide line segment 2405 is located at the air inlet 110, and is arc-shaped with its center of curvature located outside the air collecting ring 10. The upstream guide line segment 2405 is constructed such that one end can be tangent to the side wall 5 of the volute 3. The downstream guide line segment 2406 is located at the air outlet 120. The downstream guide line segment 2406 is a straight line and inclined to the inner guide groove 210. One end of the downstream guide line segment 2406 is tangentially connected to the end of the upstream guide line segment 2405 away from the collection air inlet 110. The upstream guide line segment 2405 intersects with the main guide line segment 2403 at the collection air inlet 110. It can be understood that the second guide line 2402 also has the function of the first guide line 2401.
[0076] Specifically, such as Figure 5 As shown, the first guide line 2401 is a DEF linear segment, wherein the main guide line segment 2403 is the DE segment, the secondary guide line segment 2404 is the EF segment, point D is the tangent point between the main guide line and the side wall 5 of the volute 3, and point E is the tangent point between the main guide line segment 2403 and the secondary guide line segment 2404; the second guide line 2402 is a DE'F' linear segment, wherein the upstream guide line segment 2405 is the DE' segment, the downstream guide line segment 2406 is the E'F' segment, point D is the tangent point between the upstream guide line and the side wall 5 of the volute 3, and point E' is the tangent point between the upstream guide line segment 2405 and the downstream guide line segment 2406; wherein the distance between point E and the end face of the collector ring 10 is equal to the distance between point E' and the end face of the collector ring 10.
[0077] It should also be noted that, such as Figure 4 , Figure 5 As shown, the end of the secondary guide segment 2404 that is away from the main guide segment 2403 is inclined toward the axis of the collector ring 10; the end of the downstream guide segment 2406 that is away from the upstream guide segment 2405 is inclined toward the axis of the collector ring 10.
[0078] In some embodiments, the included angle between the secondary guide segment 2404 and the end face of the collector coil 10 is 80°-90°.
[0079] Since the angle between the secondary guide segment 2404 and the end face of the collector ring 10 determines the impact direction of the inlet airflow, setting the angle between the secondary guide segment 2404 and the end face of the collector ring 10 to 80°-90° not only ensures smooth demolding of the collector 1 during processing but also reduces the generation of abnormal vortices. This avoids both the problem of excessively large angles between the secondary guide segment 2404 and the end face of the collector ring 10, which could lead to processing difficulties and demolding failure, and the problem of excessively small angles between the secondary guide segment 2404 and the end face of the collector ring 10, which could result in excessively large local airflow impact angles and easily cause abnormal vortices.
[0080] It should be noted that, as Figure 4 As shown, the angle between the secondary guide segment 2404 and the end face of the collector coil 10 is θ, where 80°≤θ≤90°.
[0081] like Figure 4 , Figure 5 As shown, in some embodiments, the outer guide structure 30 includes an outer guide profile 340, which is parallel to the inner guide profile 240 and has an offset spacing in the radial direction.
[0082] By having the outer guide profile 340 parallel to the inner guide profile 240 and having an offset gap in the radial direction, the outer guide profile 340 can be offset from the inner guide profile 240, thereby defining the specific structure of the outer guide structure 30.
[0083] It should be noted that, as Figure 4 , Figure 5 As shown, the outer guide profile 340 is the longitudinal section outline of the outer guide channel 310. The outer guide profile 340 includes a third guide profile 3401 and a fourth guide profile. One end of the third guide profile 3401 intersects with the fourth guide profile at the air inlet 110. The distance between the third guide profile 3401 and the fourth guide profile in the radial direction gradually increases in the airflow inlet direction. The third guide profile 3401 is parallel to the first guide profile 2401, and the fourth guide profile is parallel to the second guide profile 2402.
[0084] It should also be noted that the outer guide profile 340 is composed of the third guide profile 3401 and the fourth guide profile, where the third guide profile 3401 and the fourth guide profile are respectively the guide profiles for adjacent crest and trough longitudinal sections; for example Figure 5As shown, the GHK linear segment is the third guide line 3401, and the GHK linear segment can be obtained by shifting the first guide line 2401 (DEF linear segment) by a preset distance δ; in addition, the fourth guide line can be obtained by shifting the second guide line 2402 (DE'F' linear segment) by a preset distance δ.
[0085] In some embodiments, the preset spacing δ is 2-3 mm.
[0086] The preset spacing δ is the thickness of the manifold 10. It is necessary to ensure that the material thickness is as uniform as possible. By limiting it to 2-3mm, the risk of mold shrinkage can be reduced while ensuring strength. On the one hand, the preset spacing δ should not be too large, which would lead to the risk of mold shrinkage; on the other hand, the preset spacing δ should not be too small, which would lead to insufficient strength of the manifold 10 and easy deformation.
[0087] In some embodiments, the inner end face profile 220 satisfies the following formula:
[0088]
[0089] Where R is the radius of the inner end face profile 220; R0 is the radius of the inner base circle 250; a is the radial amplitude; n is the number of inner guide grooves 210; and t is the coordinate of the point corresponding to the inner end face profile 220.
[0090] The distance from any point on the inner end face profile 220 to the center of the circle is obtained by formula, thereby further defining the specific shape of the inner end face profile 220 and the specific structure of the inner guide structure 20.
[0091] It should be noted that R0 is the radius of the inner base circle 250, which is the inner radius of the collector ring 10 on the end face of the collector outlet 120; and R0 = (R max +R min ) / 2, where R max R is the maximum radius of the inner end face profile 220. min It is the minimum radius of the inner end face profile 220.
[0092] It should also be noted that the radial amplitude 'a' is the distance in the radial direction between adjacent crests and troughs of the inner end face profile 220, such as... Figure 5 As shown, the radial amplitude a is equal to the maximum distance in the radial direction between the first guide line 2401 (DEF line segment) and the second guide line 2402 (DE'F' line segment).
[0093] It should also be noted that n represents the number of internal guide channels 210, such as... Figure 2 , Figure 3As shown, the phase angle between adjacent peaks or troughs is γ, and n and γ satisfy the following relationship: n = 360° / γ, and 180 ≤ n ≤ 360. In addition, the value of n cannot be too large or too small. The specific value is determined according to actual needs. On the one hand, if the value of n is too small, the phase angle γ will be too large, resulting in an insignificant airflow dispersion and guidance effect, and failing to effectively disrupt the periodicity of airflow during reversal. On the other hand, if the value of n is too large, the phase angle γ will be too small, resulting in an excessively dense number of inner guide grooves 210. The dense guide groove feature will bring flow resistance, leading to airflow attenuation and greater processing difficulty.
[0094] It should also be noted that the outer end face profile 320 is parallel to the inner end face profile 220. The outer end face profile 320 is located on the outer wall of the collector ring 10, and the inner end face profile 220 is located on the inner wall of the collector ring 10. Therefore, it can be understood that the formulas for the outer end face profile 320 and the inner end face profile 220 differ only in the value of the base circle radius. The outer base circle radius R1 of the outer end face profile 320 is the outer radius of the collector ring 10 on the end face of the collector outlet 120. The outer end face profile 320 satisfies the following relationship:
[0095]
[0096] In some embodiments, the radial amplitude a and the inner base circle radius R0 satisfy the following relationship: 0.01≤a / R0≤0.03.
[0097] By defining the relationship between the radial amplitude a and the inner base circle radius R0, the radial amplitude a is prevented from being too large or too small. While ensuring the work capacity of impeller 2, the airflow can be effectively dispersed and guided. On the one hand, the radial amplitude is prevented from being too small, resulting in indistinct characteristics, inability to effectively disperse and guide the airflow, and inability to weaken the airflow impact. On the other hand, the radial amplitude is prevented from being too large, resulting in excessive deviation of the guide profile, causing some gas to directly enter the blade trailing edge, and the work capacity of impeller 2 to deteriorate, resulting in a decrease in air volume.
[0098] In some embodiments, the coordinate t satisfies the following relationship: 0 ≤ t ≤ 1.
[0099] The radius range of the inner end face profile 220 is limited by restricting the range of values for coordinate t.
[0100] It should be noted that R max =R0 + a / 2, R min =R0-a / 2.
[0101] In some embodiments, the points include a starting point, an ending point, and a target point. The central angle between the starting point and the ending point is 360°. The target point is located between the starting point and the ending point, and the central angle between the target point and the starting point is α. The coordinates of the starting point are 0 and 1, and the coordinates t of the target point satisfy the following relationship: t = α / 360°.
[0102] Since the inner end face profile 220 is a sinusoidal periodic curve extending annularly along the inner base circle, the inner base circle is used as a coordinate axis, and the coordinates of each point on the inner base circle are represented by 0 to 1 to describe the position of the inner base circle in the circumferential direction. For the points of the inner end face profile 220 that are at the same position as the inner base circle in the circumferential direction, their coordinates are the same as the coordinates of the corresponding points on the inner base circle. At the same time, the radius of the inner end face profile is used as another coordinate corresponding to the points of the inner end face profile 220, so that the unique position of each point of the inner end face profile 220 on the plane can be determined, and the specific shape of the inner end face profile 220 can be determined.
[0103] It should be noted that the starting point and the ending point are also points located on the base circle. The inner end face profile 220 is a sinusoidal periodic function, which includes peaks, troughs and zeros. The starting point and the ending point are zeros on the inner end face profile 220.
[0104] For example, when the number n of the inner guide channels 210 is 180, the starting point and the ending point are selected with a central angle of 360°. For the target point with a central angle α of 90° from the starting point, the coordinates of the target point are t = 90° / 360° = 0.25. Therefore, the radius R of the target point is R = R0 + (a / 2) * sin(180 * 360° * 0.25) = R0 + a / 2.
[0105] like Figure 6 , Figure 7 As shown, this application embodiment also provides a centrifugal fan, including a volute 3, an impeller 2, and a collector 1 provided in the foregoing embodiments of this application; the volute 3 is provided with at least one air inlet in the axial direction; the impeller 2 is rotatably disposed inside the volute 3; the collector 1 is disposed at the air inlet; wherein, the inner guide profile 240 of the collector 1 is tangent to the side wall 5 of the volute 3.
[0106] The gas is guided into the impeller 2 evenly and smoothly by the collector 1, reducing eddy current losses. The impeller 2 is used to form a negative pressure zone by rotating, and the airflow introduced by the collector 1 is drawn in axially under the action of pressure difference. At the same time, the impeller 2 does work on the gas, which significantly increases the static pressure and dynamic pressure of the gas. The airflow is slowed down by the volute 3, and some of the kinetic energy is converted into static pressure. Finally, the gas is discharged from the volute 3, forming a stable high-pressure airflow.
[0107] It should be noted that, as Figures 6-8 As shown, the volute 3 has two air inlets in the axial direction. The two air inlets are located on both sides of the volute 3, and each air inlet is equipped with a collector 1.
[0108] It should also be noted that, such as Figure 6 As shown, an air outlet 4 is provided on the volute 3. The air outlet 44 is located in the tangential direction at the outermost end of the spiral channel of the volute 3, and the air outlet 4 is perpendicular to the air inlet 110.
[0109] This application also provides an air conditioner, including the centrifugal fan provided in the foregoing embodiments of this application.
[0110] To further illustrate the beneficial effects of the collector 1 in reducing eddy current losses and noise, a prior art centrifugal fan is used as a comparative example. The only difference between the comparative example and the centrifugal fan of this application is that the prior art centrifugal fan is equipped with a prior art collector 1, such as a collector 1 with a radially uniformly stacked arc-shaped structure, while the centrifugal fan of this application is equipped with the collector 1 of the embodiment of this application. Under the same operating conditions (e.g., air supply mode, external static pressure 50 Pa), the air volume and noise of the centrifugal fans of the comparative example and this application at different speeds were measured, and the results are shown in Table 1. Figure 10 The results shown are as follows:
[0111] Table 1 Comparison of airflow and noise at different speeds
[0112]
[0113] Therefore, at the same rotational speed, the centrifugal fan of this application effectively increases the air volume by approximately 3%; at the same air volume, the centrifugal fan of this application reduces noise by approximately 1.0 dB. In summary, the collector 1 of this application can improve the airflow state at the inlet of the impeller 2, thereby reducing eddy current losses and achieving noise reduction.
[0114] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.
[0115] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.
[0116] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A current collector, characterized in that, include: A flow collector ring, comprising a flow collector inlet and a flow collector outlet arranged opposite to each other in the axial direction; An internal flow guiding structure is disposed on the inner wall of the flow collecting ring. The internal flow guiding structure includes a plurality of internal flow guiding grooves arranged circumferentially around the flow collecting ring. The internal flow guiding grooves extend from the flow collecting inlet to the flow collecting outlet. as well as An external flow guiding structure is disposed on the outer wall of the flow collecting ring. The external flow guiding structure includes a plurality of external flow guiding grooves arranged circumferentially around the flow collecting ring. The external flow guiding grooves extend from the flow collecting inlet to the flow collecting outlet. The external flow guiding grooves and the internal flow guiding grooves are arranged alternately in the circumferential direction of the flow collecting ring.
2. The current collector according to claim 1, characterized in that, The internal flow guiding structure includes an inner end face profile and multiple inner flow guiding ridges. The multiple inner flow guiding ridges are arranged circumferentially around the flow collecting ring. The inner flow guiding ridges and the inner flow guiding groove are continuously and alternately arranged in the circumferential direction to form a periodically undulating inner end face profile. The external flow guiding structure includes an outer end face profile and multiple external flow guiding ridges. The multiple external flow guiding ridges are arranged circumferentially around the flow collecting ring. The external flow guiding ridges and the external flow guiding grooves are continuously and alternately arranged in the circumferential direction to form a periodically undulating outer end face profile. The internal flow guiding grooves are located between two adjacent external flow guiding grooves in the circumferential direction, and the external flow guiding grooves are located between two adjacent internal flow guiding grooves in the circumferential direction.
3. The current collector according to claim 2, characterized in that, Both the inner end face profile and the outer end face profile are sinusoidal periodic curves with the same phase, wherein the peak of the inner end face profile and the trough of the outer end face profile are in the same phase.
4. The current collector according to claim 1, characterized in that, The internal flow guiding structure includes an internal flow guiding profile, which includes: First guide profile; The second guide profile intersects the first guide profile at the air inlet at one end; wherein the radial distance between the second guide profile and the first guide profile gradually increases in the airflow inlet direction.
5. The current collector according to claim 4, characterized in that, The first guide profile includes: The dominant flow pattern segment is located at the air inlet of the collection chamber. The dominant flow pattern segment is arc-shaped and its center of curvature is located outside the collection chamber. The dominant flow pattern segment is constructed such that one end can be tangent to the side wall of the volute. A secondary guide line segment is located at the air outlet of the collector. The secondary guide line segment is a straight line and is inclined to the end face of the collector ring. One end of the secondary guide line segment is tangentially connected to the end of the primary guide line segment away from the air inlet of the collector.
6. The current collector according to claim 5, characterized in that, The angle between the secondary guide line segment and the end face of the collector coil is 80°-90°.
7. The current collector according to claim 4, characterized in that, The external flow guide structure includes an external flow guide profile, which is parallel to the internal flow guide profile and has an offset spacing in the radial direction.
8. The current collector according to claim 2 or 3, characterized in that, The inner end face profile satisfies the following formula: Where R is the radius of the inner end face profile; R0 is the radius of the inner base circle; a is the radial amplitude; n is the number of inner guide grooves; and t is the coordinate corresponding to the point of the inner end face profile.
9. The current collector according to claim 8, characterized in that, The radial amplitude a and the inner base circle radius R0 satisfy the following relationship: 0.01≤a / R0≤0.
03.
10. The current collector according to claim 8, characterized in that, The coordinate t satisfies the following relationship: 0 ≤ t ≤ 1.
11. The current collector according to claim 10, characterized in that, The points include a starting point, an ending point, and a target point. The central angle between the starting point and the ending point is 360°. The target point is located between the starting point and the ending point, and the central angle between the target point and the starting point is α. The coordinates of the starting point are 0 and 1, and the coordinates t of the target point satisfy the following relationship: t = α / 360°.
12. A centrifugal fan, characterized in that, include: The volute has at least one air inlet in the axial direction; The impeller is rotatably disposed within the volute. as well as The collector according to any one of claims 1-11, wherein the collector is disposed at the air inlet; wherein the inner guide profile of the collector is tangent to the side wall of the volute.
13. An air conditioner, characterized in that, Including the centrifugal fan as described in claim 12.