Air outlet assembly and heat exchange equipment

Abstract

The invention provides an air outlet assembly and heat exchange equipment, the air outlet assembly comprises a cross-flow fan blade and a volute, and the cross-flow fan blade comprises a plurality of sub-segments arranged in the axial direction of the cross-flow fan blade; a volute tongue of the volute is provided with an air guide structure, the air guide structure comprises a plurality of air guide sub-parts, the air guide sub-parts are arranged in one-to-one correspondence with the sub-segments in the axial direction of the cross-flow fan blade, and at least one part of each air guide sub-part protrudes out of the wall face of the volute. And gaps between the sub air guide parts and the corresponding sub sections are gradually increased or decreased in the axial direction of the cross-flow fan blade. The problem that in the prior art, rotation noise of heat exchange equipment is too large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air outlet component and a heat exchange device. Background Art

[0002] Crossflow fans are widely used in air conditioning terminal heat exchange and air supply devices due to their simple structure, uniform air supply, and high dynamic pressure. The noise level is an important parameter for measuring air conditioning performance. Excessive noise will affect user use and reduce user experience. Therefore, various means are usually used to reduce the noise of crossflow fans.

[0003] The noise of crossflow fans comes from many aspects. On the one hand, due to the limitation of the boosting principle and operation mechanism of crossflow fans, the pre-swirl coefficients of airflow along different streamlines are different. Therefore, for the blades of crossflow fans, the angle of attack varies greatly when they are forced to turn in the impeller, which will cause interference noise at the leading edge of the blades. At the same time, the boundary layer on the surface of the blades will cause separation flow noise due to the instability of the separation point. On the other hand, which is the main source of noise in the indoor unit, the rotating fan blades periodically hit the nearby air at a certain frequency, arousing the regular pressure pulsation of the surrounding air and the rotation noise and turbulent noise generated by the boosting principle of the crossflow fan. Among them, turbulent noise has a positive relationship with the flow rate of the crossflow fan. As the flow rate of the fan increases, the corresponding dynamic pressure head also increases, and the turbulent noise also increases. Therefore, the fan speed is generally reduced by updating the controller program, thereby reducing the flow rate of the crossflow fan and reducing the intensity of the turbulent noise.

[0004] For rotational noise, it is generally prevented by reducing the degree of blade hitting the air and avoiding periodic hitting the air. The current way to reduce rotational noise is generally to improve the crossflow fan blades. The volute tongue, as the turning point between the air inlet side and the air supply side of the crossflow fan, has an important influence on the internal flow characteristics of the fan. It is also a major component that determines the rotational noise of the fan. Summary of the invention

[0005] The main purpose of the present invention is to provide an air outlet component and a heat exchange device to solve the problem of excessive rotation noise of the heat exchange device in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an air outlet assembly, including a crossflow fan blade and a volute, the crossflow fan blade including a plurality of sub-segments arranged along its axial direction; the volute has an air guide structure at the volute tongue, the air guide structure including a plurality of sub-air guide portions, the plurality of sub-air guide portions are arranged one-to-one corresponding to the plurality of sub-segments along the axial direction of the crossflow fan blade, at least a portion of the sub-air guide portions protrudes from the wall surface of the volute, and the gap between each sub-air guide portion and the corresponding sub-segment gradually increases or decreases along the axial direction of the crossflow fan blade.

[0007] Furthermore, the changing rules between any two adjacent sub-air guiding portions are consistent.

[0008] Furthermore, in the axial direction of the cross-flow blade, the vertical distance between the vertex of the first end of the sub-air guide portion and the wall of the volute is greater than the vertical distance between the vertex of the second end of the sub-air guide portion and the wall of the volute, and a step is formed between the second end of the sub-air guide portion and the first end of the adjacent sub-air guide portion.

[0009] Furthermore, a surface of the sub-air guiding portion facing the cross-flow fan blade is an air guiding surface, and the air guiding surface is a convex surface.

[0010] Furthermore, in the air outlet direction of the volute tongue, the middle area of ​​the air guide surface is higher than the edge areas on both sides of the air guide surface, so that the gap between the air guide surface and the crossflow fan blade first decreases and then increases in the radial direction of the crossflow fan blade.

[0011] Furthermore, the gap between the wind guide surface and the crossflow blade is in the range of 3mm-5mm.

[0012] Furthermore, the sub-air guiding portion has a windward edge facing away from the air outlet of the volute, and the windward edge is arranged obliquely to the edge of the air outlet of the volute.

[0013] Furthermore, the distance between the windward edge and the edge of the air outlet of the volute gradually decreases along the direction from the first end of the sub-air guiding portion to the second end of the sub-air guiding portion.

[0014] Furthermore, a distance difference is formed between the windward edges of two adjacent sub-air guiding portions, and the range of the distance difference is 0-5 mm.

[0015] Furthermore, the volute tongue of the volute also has an extended section, and the extended section is arranged near the air outlet of the volute relative to the air guide structure.

[0016] Furthermore, a surface of the extension section facing the crossflow blade is a concave surface or a flat surface.

[0017] Furthermore, the extension distance of the extension section is 2mm-5mm.

[0018] Furthermore, the volute tongue is a rear volute tongue of the volute.

[0019] According to another aspect of the present invention, a heat exchange device is provided, comprising the above-mentioned air outlet assembly.

[0020] By applying the technical solution of the present invention, the gap between the sub-air guide and the sub-segment is gradually changed, and multiple sub-air guides and sub-segments are arranged in a one-to-one correspondence, so that the sub-air guides at different positions along the axial direction of the through-flow fan blade and the sub-segments are unequally spaced, and the gap between the through-flow fan blade and the volute tongue is gradually changed along the axial direction of the through-flow fan blade in coordination with each sub-segment. In this way, when the airflow flows out from the through-flow fan blade to the volute tongue, the airflow generates pressure pulsations with inconsistent trends at different positions along the axial direction of each sub-air guide, thereby suppressing the high-order harmonic components generated in the mechanical waves generated by the air pulsation, thereby eliminating the harsh sound contained in the noise by such harmonics, and significantly reducing the total noise of the through-flow fan blade. At the same time, each sub-air guide is arranged in a one-to-one correspondence with the through-flow fan blade, so that each sub-air guide can cooperate with each sub-segment respectively to play a role, so as to avoid the generation of additional noise. The air guide structure of the present embodiment destroys the phase superposition of air pulsations generated by the wake area periodically sweeping over the volute tongue, thereby making the phases of the mechanical waves generated by the air pulsations inconsistent, thereby improving the rotational noise of the air outlet component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram showing the structure of the bottom shell of the heat exchange device of the present invention is shown;

[0023] Figure 2 A schematic structural diagram of the volute of the present invention is shown;

[0024] Figure 3 Shows Figure 2 A partial enlarged view of

[0025] Figure 4 An axonometric view of the volute of the present invention is shown;

[0026] Figure 5 A side view of the volute tongue of the present invention is shown;

[0027] Figure 6 A thickness cross-sectional view of the volute tongue of the present invention is shown;

[0028] Figure 7 The noise test spectrum of the heat exchange equipment equipped with ordinary smooth volute tongue at super strong gear is shown;

[0029] Figure 8 The noise test spectrum of a heat exchange device equipped with a common smooth volute tongue at a high wind speed is shown;

[0030] Fig. 9The fluid dynamics simulation analysis of a heat exchange device provided with a common smooth volute tongue is shown;

[0031] Fig.10 The fluid dynamics simulation analysis of the heat exchange device of the present invention is shown;

[0032] Fig.11 The noise test spectrum of the heat exchange device of the present invention at the super strong gear is shown;

[0033] Fig.12 The noise test spectrum of the heat exchange device of the present invention at a high wind speed is shown.

[0034] The above drawings include the following reference numerals:

[0035] 10. Volute; 11. Sub-air guiding portion; 111. First end; 112. Second end; 113. Windward edge; 12. Air guiding surface; 121. Middle area; 122. Edge area; 13. Elongated section; A. Distance difference. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0038] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0039] In order to solve the problem of excessive rotation noise of heat exchange equipment in the prior art, the present invention provides an air outlet component and a heat exchange equipment, wherein the heat exchange equipment includes the following air outlet component.

[0040] like Figures 1 to 12 An air outlet assembly is shown, comprising a crossflow fan blade and a volute 10, wherein the crossflow fan blade comprises a plurality of sub-segments arranged along its axial direction; a wind guide structure is provided at the volute tongue of the volute 10, wherein the wind guide structure comprises a plurality of sub-air guide portions 11, wherein the plurality of sub-air guide portions 11 are arranged one-to-one corresponding to the plurality of sub-segments along the axial direction of the crossflow fan blade, and at least a portion of the sub-air guide portion 11 protrudes from the wall surface of the volute 10, and a gap between each sub-air guide portion 11 and the corresponding sub-segment gradually increases or decreases along the axial direction of the crossflow fan blade.

[0041] In this embodiment, the gap between the sub-air guide 11 and the sub-segment is gradually changed, and multiple sub-air guides 11 and sub-segments are arranged in a one-to-one correspondence, so that the sub-air guide 11 at different positions along the axial direction of the cross-flow fan blade and the sub-segments are unequally spaced, and the gap between the cross-flow fan blade and the volute tongue is gradually changed along the axial direction of the cross-flow fan blade in coordination with each sub-segment. In this way, when the airflow flows out from the cross-flow fan blade to the volute tongue, the airflow generates pressure pulsations with inconsistent trends at different positions along the axial direction of each sub-air guide 11 along the cross-flow fan blade, thereby suppressing the high-order harmonic components generated in the mechanical waves generated by the air pulsation, thereby eliminating the harsh sound generated by such harmonics contained in the noise, and significantly reducing the total noise of the cross-flow fan blade. At the same time, each sub-air guide 11 is arranged in a one-to-one correspondence with the cross-flow fan blade, so that each sub-air guide 11 can cooperate with each sub-segment respectively to avoid the generation of additional noise. The air guide structure of the present embodiment destroys the phase superposition of air pulsations generated by the wake area periodically sweeping over the volute tongue, thereby making the phases of the mechanical waves generated by the air pulsations inconsistent, thereby improving the rotational noise of the air outlet component.

[0042] It should be noted that the axial direction of the crossflow blade in this embodiment is Figure 1 The left and right direction in .

[0043] In this embodiment, the change rules between any two adjacent sub-air guides 11 are consistent, thereby ensuring a smooth transition of the airflow in the axial direction of the crossflow blade, avoiding additional resistance and noise caused by sudden changes in the air duct, and making the air volume distribution more uniform. Figure 3 As shown, each sub-air guide portion 11 is arranged in sequence from left to right, and the correspondingly arranged sub-air guide portions 11 and sub-segments are called a group. The gaps between the sub-air guide portions 11 and sub-segments in a group decrease in sequence from left to right, and each group of sub-air guide portions 11 and sub-segments are arranged in this way, so that the gaps between the sub-air guide portions 11 and the sub-segments change in stages and stably along the axial direction of the through-flow fan blade, so that the airflow can smoothly transition in the axial direction of the through-flow fan blade when the through-flow fan blade enters the volute 10, thereby reducing the flow resistance of the airflow and avoiding additional noise.

[0044] In this embodiment, in the axial direction of the crossflow fan blade, the vertical distance between the vertex of the first end 111 of the sub-air guide portion 11 and the wall surface of the volute 10 is greater than the vertical distance between the vertex of the second end 112 of the sub-air guide portion 11 and the wall surface of the volute 10, and a step is formed between the second end 112 of the sub-air guide portion 11 and the first end 111 of the adjacent sub-air guide portion 11, thereby effectively guiding the airflow and reducing the collision of the airflow between the sub-air guide portions 11, thereby reducing the noise. Specifically, in this embodiment, if Figure 2 , Figure 3As shown, the left side of the sub-air guide portion 11 is higher than the right side of the wall of the volute 10, and the height of the sub-air guide portion 11 compared to the wall of the volute 10 gradually decreases from left to right, so that the second end 112 of the sub-air guide portion 11 on the left side is lower than the first end 111 of the sub-air guide portion 11 on the right side adjacent thereto, so that a step is formed between the sub-air guide portion 11 on the left side and the sub-air guide portion 11 on the right side, so that when the airflow hits the volute tongue after flowing out through the cross-flow fan blade, the time when the airflow hits the volute tongue at the connection of each sub-air guide portion 11 is inconsistent, and the impact intensity is also inconsistent, so that the phases of the mechanical waves generated by the air pulsation are inconsistent, so that the peak value of the mechanical wave at the fundamental frequency after the harmonic coherence during the propagation process is weakened, thereby reducing noise. Of course, the height of each sub-air guide portion 11 compared to the wall of the volute 10 can also be set to gradually increase from left to right, and a step can be formed between the second end 112 of the sub-air guide portion 11 and the first end 111 of the adjacent sub-air guide portion 11 to achieve the effect of reducing rotational noise.

[0045] In this embodiment, the side surface of the sub-wind guide portion 11 facing the cross-flow fan blade is a wind guide surface 12, and the wind guide surface 12 is a convex surface, so that on the one hand, the wind guide surface 12 plays a role in interfering with the superposition strength of mechanical waves to reduce noise, and on the other hand, the convex wind guide surface 12 can better guide the airflow and reduce the boundary layer separation of the airflow on the wind guide surface 12, thereby reducing wind resistance and increasing air volume. Specifically, the surface of the volute 10 of this embodiment is an arc-shaped surface to guide the outflow of the airflow, and the wind guide surface 12 is arranged on the side of the volute 10 close to the cross-flow fan blade, and the wind guide surface 12 protrudes from the surface of the volute 10, thereby changing the time and intensity of the airflow hitting the wind guide surface 12, thereby reducing the superposition strength of the mechanical waves generated by air pulsation, thereby reducing noise.

[0046] In this embodiment, in the air outlet direction of the volute tongue, the middle area 121 of the air guide surface 12 is higher than the edge areas 122 on both sides of the air guide surface 12, so that the gap between the air guide surface 12 and the crossflow blades first decreases and then increases in the radial direction of the crossflow blades. Specifically, in this embodiment, along the air outlet direction of the volute tongue, the air guide surface 12 is set to be sloped, the middle area 121 of the air guide surface 12 is the top of the slope, and the edge areas 122 on both sides gradually decrease in height in the direction away from the top of the slope, thereby gradually increasing the gap between the air guide surface 12 and the crossflow blades. In this way, the position of the wind guide surface 12 in the axial direction of the crossflow fan blade and the air outlet direction of the volute tongue is constantly changing compared to the wall of the volute 10, so that the gaps between different positions of the wind guide surface 12 and the crossflow fan blade are different, so that the time when the airflow flowing out from different positions in the same sub-segment hits the volute tongue after being accelerated by the crossflow fan blade is inconsistent, and the intensity of the impact is also inconsistent, so that the phase of the mechanical wave generated by the air pulsation is inconsistent, so that the peak value at the fundamental frequency of the mechanical wave is weakened to a smaller distribution value after the harmonic coherence during the propagation process, thereby reducing the rotational noise generated by the air outlet component.

[0047] In this embodiment, the gap between the air guide surface 12 and the crossflow blade is in the range of 3mm-5mm, that is, the thickness gradient value of the sub-air guide portion 11 is 0-2mm, so as to ensure the smooth outflow of the airflow, and avoid direct contact between the crossflow blade and the volute 10, and avoid friction between the crossflow blade and the volute 10, so as to ensure the long-term stable operation of the heat exchange device. Of course, according to the actual situation such as the size of the crossflow blade, the gap between the air guide surface 12 and the crossflow blade can be adjusted accordingly.

[0048] In this embodiment, the sub-air guide portion 11 has a windward edge 113 facing away from the air outlet of the volute 10, and the windward edge 113 is arranged obliquely with the edge of the air outlet of the volute 10, so as to guide the flow of airflow, reduce turbulence and wind resistance, and thus reduce the noise of the air outlet assembly. The edge of the air outlet of the volute 10 of this embodiment refers to the edge of the volute 10 extending along the axial direction of the cross-flow fan blade. The windward edge 113 is arranged obliquely relative to the edge of the air outlet of the volute 10, that is, when the airflow hits the windward edge 113, the impact intensity and impact time are inconsistent, so that the air pulsation generated by the airflow hitting the volute tongue and the phase of the mechanical wave generated are inconsistent, thereby reducing the superposition value of the mechanical wave, thereby reducing the noise.

[0049] In this embodiment, the distance between the windward edge 113 and the edge of the air outlet of the volute 10 gradually decreases from the first end 111 of the sub-air guide portion 11 to the second end 112 of the sub-air guide portion 11. This gradual distance distribution can destroy the pulsation caused by the periodic impact of the airflow on the volute tongue, reduce the resulting rotational noise and turbulent noise, and thus significantly reduce the noise level of the heat exchange equipment during operation. At the same time, this gradual distance makes the transition of the airflow between the air guide structure and the air outlet smoother, reduces the turbulence and separation of the airflow, and thus improves the overall stability and efficiency of the airflow.

[0050] In this embodiment, a distance difference A is formed between the windward edges 113 of two adjacent sub-air guides 11, and the range of the distance difference A is 0-5 mm, so that the airflow disturbances on different sub-air guides 11 are staggered in time and space, so that the peak in the noise spectrum is weakened and the noise energy distribution is more uniform, thereby avoiding harsh high-frequency noise.

[0051] In this embodiment, the crossflow fan blade includes a plurality of sub-segments. Along the axial direction of the crossflow fan blade, the lengths of these sub-segments can be set according to actual requirements. The lengths of the sub-segments can be the same, different, or partially the same. When the crossflow fan blade includes two or more sub-segments of different lengths, the length of the sub-wind guide surface 12 along the axial direction of the crossflow fan blade changes accordingly with the sub-segments. In this way, when the lengths of two adjacent sub-segments are different, the phase difference of the mechanical waves generated by the airflow derived from the two adjacent sub-segments hitting the volute tongue is also different. During the propagation process, the peak value at the fundamental frequency is weakened to a smaller distribution value after the harmonics are coherent, thereby further reducing the noise.

[0052] In the present embodiment, the volute 10 further has an extension section 13 at the volute tongue, and the extension section 13 is arranged near the air outlet of the volute 10 relative to the wind guide structure. The introduction of the extension section 13 helps to extend the flow path of the airflow in the volute 10, so that the airflow has a longer time to mix and balance before the outlet, thereby reducing the unevenness of the airflow and avoiding the generation of local high-speed airflow, thereby reducing local turbulence and rotation noise. At the same time, the extension section 13 can effectively capture and regulate the airflow that is about to leave the volute 10, and reduce the impact and separation of the airflow at the air outlet by changing the flow direction and speed of the airflow, thereby effectively reducing the noise.

[0053] In this embodiment, the surface of the extension section 13 facing the crossflow blade is a concave surface or a flat surface, so as to better guide the airflow and reduce the boundary layer separation of the airflow at the extension section 13, thereby reducing wind resistance and further reducing noise. Figure 5 , Figure 6As shown, the volute tongue of this embodiment is the rear volute tongue of the volute 10, and the side wall of the rear volute tongue facing the airflow is concave in the direction away from the airflow, and the extension section 13 is in the same concave direction as the rear volute tongue, thereby achieving the effect of reducing noise. Of course, according to actual needs, the extension section 13 can also be set as a plane without curvature.

[0054] In this embodiment, the extension distance of the extension section 13 is 2mm-5mm, so as to ensure the smooth flow of the airflow. At the same time, the extension section 13 can accurately adjust the flow path and time of the airflow inside the volute 10, so that the airflow is more evenly distributed when it reaches the air guide structure, thereby reducing irregular disturbances of the airflow and further reducing rotational noise. At the same time, the extension section 13 helps to alleviate the sudden changes of the airflow from the air outlet of the volute 10, reduce the impact and turbulence of the airflow at the air outlet, and effectively reduce the outlet noise. Moreover, a reasonable extension distance helps the airflow to flow better along the wall of the volute 10, thereby reducing the separation of the airflow, optimizing the flow efficiency of the airflow, and reducing the noise generated by the separation of the airflow.

[0055] like Figure 1 As shown, the volute tongue of this embodiment is arranged in the bottom shell of the heat exchange device, and the entire surface of the volute tongue close to the airflow is arranged as a whole to have a certain curvature or to be provided with a partial plane, so that the surface is relatively smooth. Compared with the ordinary serrated volute tongue, this structure is simpler and easier to demold during processing, thereby improving the problem of difficulty in demolding in traditional volute tongue processing.

[0056] It should be noted that the air outlet assembly of this embodiment can be used on a cross-flow fan to reduce the rotation noise of the cross-flow fan. During the operation of the heat exchange equipment, when the airflow flows through the blades of the cross-flow fan blades, a boundary layer is formed on the surface of the blades, especially the boundary layer of the suction side is easy to thicken and generate many vortices. At the trailing edge of the blade, the boundary layers of the suction side and the pressure side merge to form a wake zone. In the wake zone, the pressure and speed of the airflow are much lower than those of the main airflow zone. Due to the existence of the wake zone, the speed and pressure of the airflow are uneven, and this uneven airflow acts on the volute 10 to form pressure pulsation. Especially at the volute tongue, due to the small gap between this place and the impeller of the cross-flow fan blade, a stronger pressure pulsation will be generated, thereby forming the sound wave radiation of the blade passing frequency and its harmonics. The maximum value of the aerodynamic noise of the cross-flow fan is usually near the fundamental frequency f1 of the cross-flow fan. At the fundamental frequency f1 and its integer multiples, i.e., the harmonic frequency, the noise intensity level is obviously much higher than that at other frequencies on the spectrum, and the peak value is the highest. The calculation formula of the fundamental frequency f1 and harmonic frequency of the impeller rotation noise is:

[0057]

[0058] Where n is the impeller speed in r / min; Z is the number of blades; i is the harmonic number 1, 2, 3... When i is 1, it is the fundamental frequency.

[0059] For the heat exchange equipment with ordinary smooth volute tongue, the impeller speed of the crossflow fan blade is set to 1250r / min, the number of blades is 35, the harmonic sequence number is 1, and the test spectrum of the whole machine running noise is analyzed, such as Figure 7 As shown, under the super cooling condition, the total noise value is 45.5dBA, the peak value is 26.2dBA, and the peak frequency is 732Hz; Figure 8 As shown, the total noise value of the high windshield is 41dBA, the peak value is 21.9dBA, and the peak frequency is 640Hz. The fundamental frequency of the crossflow fan blade of this embodiment at the super strong windshield is calculated by the fundamental frequency formula: f1=n*Z / 60=1250*35 / 60=729.16Hz. The spectrum shows that the peak frequency is 732Hz, which is near the fundamental frequency of the fan blade. It can be seen that the total noise value of the super high windshield exceeds the standard, and the rotational noise accounts for a large proportion. The fundamental frequency of the crossflow fan blade of this embodiment at the high windshield is calculated by the fundamental frequency formula: f1=n*Z / 60=1060*35 / 60=618.3Hz. The frequency of the noise peak at the high windshield is 640Hz, which is near the fundamental frequency.

[0060] From the spectrum calculation and analysis of the above two windshields, the noise peaks all appear near the fundamental frequency. Compared with the sound pressure level of turbulent noise, the sound pressure of rotational noise has a greater impact and the rotational noise is obvious. To improve the noise quality and reduce the noise level, solving the problem of improving rotational noise is an effective and necessary link. The method to reduce rotational noise is to destroy the phase superposition of the pulsation generated by the periodic sweep of the wake area across the volute tongue when the crossflow fan blade is running. The implementation method is to change the offset angle of the crossflow fan blade and modulate the rear volute tongue with unequal spacing, so that the time when the air flowing out of the same sub-segment hits the volute tongue after being accelerated by the crossflow fan is inconsistent, and the intensity of the impact is also inconsistent, which leads to inconsistent phases of the mechanical waves generated by the air pulsation, and the phase difference between the two adjacent blades hitting the volute tongue is also different, so that the peak at the fundamental frequency f1 after the harmonic coherence during the propagation process is weakened to a smaller distribution value. At the same time, inconsistent pressure pulsations are generated in the axial direction, suppressing the large high-order harmonic components generated by the wind wheel, thereby eliminating the harsh sound generated by such harmonics in the noise and significantly reducing the total noise level of the crossflow fan blades.

[0061] In this embodiment, the rear volute tongue is subjected to unequal pitch modulation, and the length of each sub-air guide portion 11 of the rear volute tongue along the axial direction of the throughflow blade is maintained at the same modulation level as the length of the sub-segment, that is, the lengths of the two are consistent. Figure 2 The gradient is performed in both the horizontal and vertical directions, and the length of each gradient segment is equal to the length of the corresponding sub-segment, such as Figure 3 As shown, the spatial positions of any two points in the same sub-air guide portion 11 are inconsistent. Figure 6As shown, the extension section 13 is lengthened or shortened, changing the entry point of the airflow into the air outlet assembly, and the total noise value also changes. Preferably, when the air volume of the heat exchange equipment meets the standard, the extension distance of the extension section 13 is set to 2mm-5mm, which is conducive to the improvement of the rotation noise. Figure 4 , Figure 6 As shown, the principle and scheme of the modulation process of the extension section 13 are basically consistent with the modulation of the sub-air guide portion 11, and the parameter values ​​can also be determined according to the same scheme, which will not be repeated.

[0062] According to the above volute tongue structure, the broadband noise distribution of the front internal engine is changed, and the CDF fluid dynamics simulation analysis of the air duct is performed using ANSYS software. The flow field of the air duct before and after the change is analyzed. Fig. 9 , Fig.10 It can be seen that the rotation noise at the volute tongue has been significantly improved. A prototype was made according to the model after the rear volute tongue was modulated to conduct noise testing. The total value and peak value of the noise on the inner unit side in cooling, heating, and air supply modes were tested. The noise values ​​of the super-strong and high wind gears in cooling mode are as follows:

[0063] Windshield Total noise level Peak frequency Super strong gear 43.6 25.2 726 Fifth gear 40.6 20.3 636

[0064] The noise test spectrum under super strong mode is as follows Fig.11 As shown, the high wind noise spectrum is as follows Fig.12 As shown in the figure, from the spectrum, the total value of the super-strong gear dropped by 1.9dB, and the peak value dropped by 1.0dB. The improvement effect is obvious; the total value of the high wind gear dropped by 0.4dB, and the peak value was 1.6dB, and the improvement effect is obvious. There is no particularly protruding peak near the peak of the spectrum upload, and no strong discrete noise appears.

[0065] The air outlet assembly of this embodiment is different from the conventional method of improving the rotation noise by improving the cross-flow fan blades. This embodiment improves the structure of the rear volute tongue to make the volute tongue more suitable for the structure of the cross-flow fan blades, thereby reducing the rotation noise and improving the user experience.

[0066] It should be noted that, the multiple in the above embodiments refers to at least two.

[0067] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0068] 1. Solved the problem of excessive rotation noise of heat exchange equipment in the prior art;

[0069] 2. By setting the gap between the sub-air guide and the sub-segment to change gradually, and setting a plurality of sub-air guides and sub-segments to correspond one to one, the sub-air guides are arranged at different positions along the axial direction of the crossflow fan blade and the sub-segments have unequal spacing, and the gap between the crossflow fan blade and the volute tongue is gradually changed along the axial direction of the crossflow fan blade in coordination with each sub-segment;

[0070] 3. When the airflow flows out from the crossflow blade to the volute tongue, the airflow generates pressure pulsations with inconsistent trends at different positions of each sub-air guide along the axial direction of the crossflow blade, thereby suppressing the high-order harmonic components generated in the mechanical waves generated by the air pulsation, thereby eliminating the harsh sound caused by the inclusion of such harmonics in the noise, and significantly reducing the total noise of the crossflow blade. At the same time, each sub-air guide is arranged in a one-to-one correspondence with the crossflow blade, so that each sub-air guide can cooperate with each sub-segment to avoid additional noise. The air guide structure of this embodiment destroys the superposition of the phase of the air pulsation generated by the wake area periodically sweeping the volute tongue, so that the phase of the mechanical wave generated by the air pulsation is inconsistent, thereby improving the noise of the air outlet component.

[0071] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0072] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0073] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air outlet component, characterized in that: include: A crossflow blade, wherein the crossflow blade comprises a plurality of sub-segments arranged along the axial direction thereof; A volute (10), wherein the volute tongue of the volute (10) has an air guide structure, wherein the air guide structure comprises a plurality of sub-air guide portions (11), wherein the plurality of sub-air guide portions (11) are arranged one-to-one with the plurality of sub-segments along the axial direction of the crossflow fan blade, wherein at least a portion of the sub-air guide portions (11) protrudes from the wall surface of the volute (10), and a gap between each sub-air guide portion (11) and the corresponding sub-segment gradually increases or decreases along the axial direction of the crossflow fan blade.

2. The air outlet assembly according to claim 1, characterized in that: The changing rules between any two adjacent sub-air guiding portions (11) are consistent.

3. The air outlet assembly according to claim 1, characterized in that: In the axial direction of the crossflow blade, the vertical distance between the vertex of the first end (111) of the sub-air guide portion (11) and the wall surface of the volute (10) is greater than the vertical distance between the vertex of the second end (112) of the sub-air guide portion (11) and the wall surface of the volute (10), and a step is formed between the second end (112) of the sub-air guide portion (11) and the first end (111) of the adjacent sub-air guide portion (11).

4. The air outlet assembly according to claim 1, characterized in that: A surface of the sub-air guiding portion (11) facing the cross-flow fan blade is an air guiding surface (12), and the air guiding surface (12) is a convex surface.

5. The air outlet assembly according to claim 4, characterized in that: In the air outlet direction of the volute tongue, the middle area (121) of the air guide surface (12) is higher than the edge areas (122) on both sides of the air guide surface (12), so that the gap between the air guide surface (12) and the crossflow blade first decreases and then increases in the radial direction of the crossflow blade.

6. The air outlet assembly according to claim 4, characterized in that: The gap between the wind guide surface (12) and the crossflow blade is in the range of 3 mm to 5 mm.

7. The air outlet assembly according to claim 1, characterized in that: The sub-air guiding portion (11) has a windward edge (113) facing away from the air outlet of the volute (10), and the windward edge (113) is arranged obliquely to the edge of the air outlet of the volute (10).

8. The air outlet assembly according to claim 7, characterized in that: The distance between the windward edge (113) and the edge of the air outlet of the volute (10) gradually decreases in a direction from the first end (111) of the sub-air guiding portion (11) to the second end (112) of the sub-air guiding portion (11).

9. The air outlet assembly according to claim 8, characterized in that: A distance difference (A) is formed between the windward edges (113) of two adjacent sub-wind guiding portions (11), and the range of the distance difference (A) is 0-5 mm.

10. The air outlet assembly according to any one of claims 1 to 9, characterized in that: The volute (10) also has an extended section (13) at the volute tongue, and the extended section (13) is arranged near the air outlet of the volute (10) relative to the air guide structure.

11. The air outlet assembly according to claim 10, characterized in that: The surface of the extension section (13) facing the crossflow blade is a concave surface or a flat surface.

12. The air outlet assembly according to claim 10, characterized in that: The extension distance of the extension section (13) is 2mm-5mm.

13. The air outlet assembly according to any one of claims 1 to 9, characterized in that: The volute tongue is the rear volute tongue of the volute (10).

14. A heat exchange device, characterized in that: It comprises the air outlet assembly according to any one of claims 1 to 13.

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