Axial flow wind wheel and air conditioner

Abstract

The utility model relates to the technical field of air conditioners, and provides an axial flow wind wheel and an air conditioner. The axial flow wind wheel comprises a hub and a plurality of flow guide fan blades arranged in the circumferential direction of the hub at intervals, each flow guide fan blade is provided with a front edge and a tail edge, and the front edge is located in front of the tail edge in the rotating direction of the flow guide fan blades; a flow guide groove is formed in the suction face of the flow guide fan blade and extends between the front edge and the tail edge of the flow guide fan blade in the circumferential direction of the axial flow wind wheel, and the two ends, in the circumferential direction, of the flow guide groove are spaced from the front edge and the tail edge of the flow guide fan blade respectively. According to the axial-flow wind wheel, it is guaranteed that the flow guide fan blades have high structural strength, the air volume of the axial-flow wind wheel flowing in the radial direction is reduced, airflow can flow more smoothly in the circumferential direction of the axial-flow wind wheel, and therefore the air volume loss of the axial-flow wind wheel is reduced, noise and power generated when the axial-flow wind wheel works are reduced, and the service life of the axial-flow wind wheel is prolonged. And the efficiency of the axial flow wind wheel is improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an axial flow fan and an air conditioner. Background Art

[0002] Axial flow impellers are widely used in household appliances as ventilation devices due to their simple structure and compact size. For example, most existing air conditioner outdoor units use axial flow impellers. When the axial flow impeller is in operation, its rotation drives the air around it to form an airflow. The airflow flows along the surface of the axial flow impeller, eventually leaving the axial flow impeller along its axis and being blown out of the air outlet of the air conditioner outdoor unit. However, as the airflow flows along the surface of the axial flow impeller, it is affected by centrifugal force, and a component of motion occurs along the radial direction of the axial flow impeller. This component eventually leaves the blade tips of the axial flow impeller, forming a vortex, which increases power and noise. Utility Model Content

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides an axial flow fan and an air conditioner.

[0004] In a first aspect, the present application provides an axial flow wind wheel, comprising a hub and a plurality of guide blades spaced apart in a circumferential direction of the hub, wherein the guide blades have a leading edge and a trailing edge, wherein the leading edge is located ahead of the trailing edge in a rotation direction of the guide blades;

[0005] A guide groove is provided on the suction surface of the guide blade. The guide groove extends along the circumference of the axial flow wind wheel between the leading edge and the trailing edge, and the two ends of the guide groove along the circumference are spaced from the leading edge and the trailing edge respectively.

[0006] The axial flow wind wheel provided by the present application is provided with a guide groove on the suction surface of the guide fan blade, and the guide groove is extended along the circumference of the axial flow wind wheel between the leading edge and the trailing edge of the guide fan blade. With such a configuration, when the axial flow wind wheel is working, the airflow can flow along the extension direction of the guide groove, that is, the airflow can flow along the circumference of the axial flow wind wheel, thereby reducing the radial movement component of the airflow along the axial flow wind wheel, and then reducing the amount of airflow leaving from the blade top of the guide fan blade of the axial flow wind wheel, thereby reducing the vortex leakage at the blade top of the guide fan blade, thereby reducing the noise and power of the axial flow wind wheel when it is working, and improving the efficiency of the axial flow wind wheel; and the guide groove is provided on both sides along the circumference The ends are spaced from the leading edge and the trailing edge respectively, so as to ensure that the setting of the guide groove does not destroy the integrity of the leading edge and the trailing edge of the guide blade, so that the airflow can flow more smoothly through the leading edge of the guide blade to the suction surface of the guide blade, and then flow along the extension direction of the guide groove, and finally flow out of the suction surface of the guide blade more smoothly through the trailing edge of the guide blade, so as to ensure the smoothness of the airflow flowing along the circumferential direction of the axial flow wind wheel, thereby better reducing the noise and power of the axial flow wind wheel during operation; and the guide groove adopts the above-mentioned structural design, which can ensure that the guide blade has a high structural strength and reduce the risk of the guide blade breaking under falling or high speed. In other words, the axial flow wind wheel provided by the present application not only ensures that the guide blade has a high structural strength, but also reduces the amount of air flowing in the radial direction of the axial flow wind wheel, and allows the airflow to flow more smoothly along the circumference of the axial flow wind wheel, thereby reducing the air volume loss of the axial flow wind wheel, reducing the noise and power of the axial flow wind wheel during operation, and improving the efficiency of the axial flow wind wheel.

[0007] In some embodiments, the guide groove is a groove structure formed on the suction surface of the guide blade; the portion of the suction surface of the guide blade close to the leading edge and the portion close to the trailing edge are both flat surfaces, and the bottom walls of the guide groove at both ends along the circumferential direction smoothly transition to the suction surface.

[0008] In some embodiments, the maximum depth of the guide groove is greater than or equal to 0.5 mm and less than or equal to 2 / 3 of the thickness of the guide blade.

[0009] In some embodiments, along the circumference of the axial flow wind wheel from the leading edge to the trailing edge, the width of the guide groove along the radial direction of the axial flow wind wheel is equal or gradually widens.

[0010] In some embodiments, there are multiple guide grooves, and the multiple guide grooves are arranged at intervals along the radial direction of the axial flow wind wheel, and a partition portion is formed between two adjacent guide grooves.

[0011] In some embodiments, the guide blade has a blade root adjacent to the hub and a blade top away from the hub; a plurality of the guide grooves are arranged in sequence along the radial direction of the axial flow wind wheel from the blade top to the blade root.

[0012] In some embodiments, along the radial direction of the axial flow wind wheel from the blade tip to the blade root, the relative widths of the plurality of guide grooves gradually narrow;

[0013] And / or, along the radial direction of the axial flow wind wheel from the blade tip to the blade root, the minimum distance between two adjacent guide grooves is not less than 2 mm.

[0014] In some embodiments, the sum of the widths of the plurality of guide grooves along the radial direction of the axial flow wind wheel is A;

[0015] A=R-0.5*DBT=E1+…+E n +G1+…+G n-1 ;

[0016] Among them, R is the minimum radius of the guide blade, D is the diameter of the hub, B is the minimum distance between the guide groove closest to the hub and the hub, T is the minimum distance between the blade tip of the guide blade and the guide groove closest to the blade tip, E n G is the maximum width of the Nth guide groove along the radial direction from the blade tip to the blade root of the axial flow rotor, n-1 The minimum distance between the N-1th guide groove and the Nth guide groove in the radial direction from the blade tip to the blade root of the axial flow wind wheel;

[0017] Among them, 2mm≤G n-1 ≤5mm, T>3mm, B>5mm, E1≥E2≥…≥E n , and E n >10mm, E1≥A / n, n is an integer greater than 1.

[0018] In some embodiments, the intersection points of the midline of the guide groove extending in the circumferential direction and the extreme position of the guide groove in the circumferential direction are points Q and P, and the intersection points of the extension line of the midline of the guide groove extending in the circumferential direction with the trailing edge and the leading edge are points M and N respectively, and point M is close to point Q, and point N is close to point P.

[0019] The angle formed by the line connecting the axis O of the hub and the points M and N is a first angle C1, the angle formed by the line connecting the axis O of the hub and the points M and Q is a second angle C2, and the angle formed by the line connecting the axis O of the hub and the points Q and P is a third angle C3.

[0020] Among them, C2≤0.15C1, C3≥0.4C1.

[0021] A second aspect of the present application provides an air conditioner, comprising a casing and an axial flow fan as described in any one of the above embodiments, wherein the axial flow fan is installed in the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 This is a structural diagram of an air conditioner according to an embodiment of the present application;

[0025] Figure 2 This is a schematic structural diagram of an air conditioner according to an embodiment of the present application with the mesh cover removed;

[0026] Figure 3 This is a schematic diagram of the main structure of the axial flow wind wheel according to one embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the rear structural view of the axial flow wind wheel according to one embodiment of the present application;

[0028] Figure 5 A schematic diagram of the pressure surface of the axial flow wind wheel according to an embodiment of the present application;

[0029] Figure 6 A schematic diagram of the pressure surface and suction surface of the axial flow wind wheel according to an embodiment of the present application;

[0030] Figure 7 Schematic diagram of air flow direction of the comparative example axial flow impeller without guide grooves;

[0031] Figure 8 A schematic diagram of the airflow direction of an axial flow impeller provided with guide grooves according to an embodiment of the present application;

[0032] Figure 9 This is a schematic structural diagram of the suction surface of the axial flow wind wheel according to an embodiment of the present application.

[0033] Among them, 1. axial flow wind wheel; 11. hub; 12. guide blade; 120. guide groove; 120a. first guide groove; 120b. second guide groove; 120c. third guide groove; 120d. fourth guide groove; 121. leading edge; 122. trailing edge; 123. blade top; 124. blade root; 125. pressure surface; 126. suction surface; 2. casing; 21. front panel; 22. mesh cover. DETAILED DESCRIPTION

[0034] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present application, not all of the embodiments.

[0036] Some embodiments of the present application provide an axial flow wind wheel and an air conditioner using the axial flow wind wheel. Specifically, the axial flow wind wheel can be installed in the casing of the air conditioner, and the air conditioner can be an integrated air conditioner or a split air conditioner. For an integrated air conditioner, the axial flow wind wheel can be installed on the outdoor side of the integrated air conditioner; for a split air conditioner, the axial flow wind wheel can be installed on the outdoor unit of the split air conditioner. Of course, the axial flow wind wheel is not limited to use in air conditioners, but can also be used in other electrical products that require ventilation, such as fans and blowers.

[0037] For example, referring to Figure 1 and Figure 2 As shown, the axial flow fan wheel 1 can be used in the outdoor unit of a split-type air conditioner. Specifically, the outdoor unit of the air conditioner includes a casing 2, and the axial flow fan wheel 1 is installed in the casing 2. Figure 1 As shown, an air outlet is provided on the front panel 21 of the housing 2, and a mesh cover 22 is provided at the air outlet. Figure 2 This is a structural diagram showing the axial flow wind wheel 1 after removing the mesh cover 22.

[0038] Reference Figures 3 to 9 As shown, some embodiments of the present application provide an axial flow wind wheel 1, comprising a hub 11 and a plurality of guide blades 12 spaced apart in the circumferential direction of the hub 11, the guide blades 12 having a leading edge 121 and a trailing edge 122, the leading edge 121 being located in front of the trailing edge 122 along the rotation direction of the guide blade 12. Figure 3 and Figure 4 As shown, the arc arrow in the figure indicates the rotation direction of the guide blade 12.

[0039] Specifically, the hub 11 is connected to a drive motor, and a plurality of guide blades 12 are evenly and spaced apart along the outer circumference of the hub 11. The number of guide blades 12 can be two or more, and is not specifically limited here. The hub 11 rotates under the drive motor, driving the guide blades 12 to rotate. The rotation of the guide blades 12 also drives the circumferential airflow, which flows along the surface of the guide blades 12 and is ultimately blown out along the axial direction of the axial flow rotor 1.

[0040] Reference Figure 5 and Figure 6 As shown, the guide vane 12 has a pressure surface 125 and a suction surface 126. The two sides of the guide vane 12 are the pressure surface 125 and the suction surface 126 respectively. The suction surface 126 of the guide vane 12 faces away from the air outlet side of the axial flow wind wheel 1, and the pressure surface 125 of the guide vane 12 faces the air outlet side of the axial flow wind wheel 1. Figure 3 As shown, the pressure surface 125 of the guide vane 12 is shown; Figure 4 As shown, the suction surface 126 of the guide blade 12 is illustrated.

[0041] Continue to refer to Figure 4 As shown, a guide groove 120 is provided on the suction surface 126 of the guide blade 12. The guide groove 120 extends along the circumference of the axial flow wind wheel 1 between the leading edge 121 and the trailing edge 122 of the guide blade 12, and the two ends of the guide groove 120 along the circumferential direction are spaced from the leading edge 121 and the trailing edge 122 of the guide blade 12 respectively.

[0042] It should be noted that in order to ensure that the guide groove 120 has a good guiding effect, it is necessary to ensure that the guide groove 120 has a sufficient extension length along the circumference of the axial flow wind wheel 1 between the leading edge 121 and the trailing edge 122 of the guide blade 12. At the same time, it is necessary to ensure that the setting of the guide groove 120 does not destroy the integrity of the leading edge 121 and the trailing edge 122 of the guide blade 12.

[0043] In other words, the guide groove 120 can be configured such that one circumferential end extends to a position adjacent to the leading edge 121 of the guide blade 12 but does not penetrate the leading edge 121 of the guide blade 12. In other words, the guide groove 120 can be configured such that one circumferential end is spaced from the leading edge 121 of the guide blade 12. The other circumferential end of the guide groove 120 extends to a position adjacent to the trailing edge 122 of the guide blade 12 but does not penetrate the trailing edge 122 of the guide blade 12. In other words, the provision of the guide groove 120 does not destroy the integrity of the leading edge 121 and trailing edge 122 of the guide blade 12. In a specific implementation, the pressure surface 125 of the guide blade 12 can be maintained as a flat surface adjacent to the leading edge 121, and the pressure surface 125 adjacent to the trailing edge 122 can also be maintained as a flat surface.

[0044] The axial flow wind wheel 1 provided in the embodiment of the present application is provided with a guide groove 120 on the suction surface 126 of the guide blade 12, and the guide groove 120 is extended along the circumference of the axial flow wind wheel 1 between the leading edge 121 and the trailing edge 122 of the guide blade 12. With such a configuration, when the axial flow wind wheel 1 is working, the airflow can flow along the extension direction of the guide groove 120, that is, the airflow can flow along the circumference of the axial flow wind wheel 1, thereby reducing the radial movement component of the airflow along the axial flow wind wheel 1, and further reducing the amount of airflow leaving from the blade top of the guide blade 12 of the axial flow wind wheel 1, thereby reducing the vortex leakage at the blade top of the guide blade 12, thereby reducing the noise and power of the axial flow wind wheel 1 when working, and improving the efficiency of the axial flow wind wheel 1; and the two ends of the guide groove 120 along the circumferential direction are respectively connected to the guide blade The leading edge 121 and the trailing edge 122 of the blade 12 are spaced apart, thereby ensuring that the setting of the guide groove 120 does not destroy the integrity of the leading edge 121 and the trailing edge 122 of the guide blade 12, so that the airflow can flow more smoothly through the leading edge 121 of the guide blade 12 to the suction surface 126 of the guide blade 12, and then flow along the extension direction of the guide groove 120, and finally flow out of the suction surface 126 of the guide blade 12 more smoothly through the trailing edge 122 of the guide blade 12, thereby ensuring the smoothness of the circumferential flow of the airflow along the axial flow wind wheel 1, thereby better reducing the noise and power of the axial flow wind wheel 1 during operation; and the guide groove 120 adopts the above-mentioned structural design, which can ensure that the guide blade 12 has a higher structural strength, reducing the risk of the guide blade breaking under falling or high speed. That is to say, the axial flow wind wheel 1 provided in the embodiment of the present application not only ensures that the guide blades 12 have a high structural strength, but also reduces the amount of air flowing radially along the axial flow wind wheel 1, and allows the airflow to flow more smoothly along the circumference of the axial flow wind wheel 1, thereby reducing the air volume loss of the axial flow wind wheel 1, reducing the noise and power of the axial flow wind wheel 1 during operation, and improving the efficiency of the axial flow wind wheel 1.

[0045] Reference Figure 7 and Figure 8 As shown, Figure 7 Schematic diagram of the airflow direction of the axial flow fan wheel without guide grooves in the comparative example, in which the clockwise arrow indicates the rotation direction of the axial flow fan wheel and the counterclockwise arrow indicates the airflow direction; Figure 8 This is a schematic diagram of the airflow direction of an axial-flow wind wheel equipped with guide grooves according to an embodiment of the present application. The clockwise arrow in the diagram indicates the direction of rotation of the axial-flow wind wheel, and the counterclockwise arrow indicates the direction of airflow. As can be seen, in the comparative example of an axial-flow wind wheel without guide grooves, the airflow has a component flowing radially along the axial-flow wind wheel, which easily forms vortices at the tips of the guide blades. However, in the axial-flow wind wheel equipped with guide grooves according to the embodiment of the present application, the guide grooves guide the airflow along the circumference of the axial-flow wind wheel, reducing the component of airflow flowing radially along the axial-flow wind wheel.

[0046] It should be noted that the flow direction of the airflow is from the leading edge 121 of the guide blade 12 to the trailing edge 122, and the guide groove 120 of the embodiment of the present application extends from the leading edge 121 of the guide blade 12 to the trailing edge 122 along the circumference of the axial flow wind wheel 1, that is, the guide groove 120 is arranged along the flow direction of the airflow to better guide the airflow.

[0047] In some embodiments, the guide groove 120 is a groove structure formed on the suction surface 126 of the guide blade 12. The suction surface 126 of the guide blade 12 near the leading edge 121 and the trailing edge 122 are both flat surfaces. The bottom wall of the guide groove 120 at both ends of the circumferential direction smoothly transitions into the suction surface 126. Specifically, the guide groove 120 can be a groove structure formed by removing some material from the suction surface 126. Of course, the guide groove 120 can also be integrally formed on the guide blade 12, or formed on the guide blade 12 by stamping or other methods.

[0048] Specifically, the depth of the end portion of the guide groove 120 circumferentially adjacent to the leading edge 121 gradually increases in the direction toward the trailing edge 122, that is, the closer the end portion of the guide groove 120 circumferentially adjacent to the leading edge 121 is to the leading edge 121, the smaller the depth of the guide groove 120 is, so that the groove bottom wall of the end portion of the guide groove 120 circumferentially adjacent to the leading edge 121 and the suction surface 126 transition smoothly; the depth of the end portion of the guide groove 120 circumferentially adjacent to the trailing edge 122 gradually decreases in the direction toward the trailing edge 122, that is, the closer the end portion of the guide groove 120 circumferentially adjacent to the trailing edge 122 is to the trailing edge 122, the smaller the depth of the guide groove 120 is, so that the groove bottom wall of the end portion of the guide groove 120 circumferentially adjacent to the trailing edge 122 and the suction surface 126 transition smoothly. Specifically, the transition between one end of the guide groove 120 adjacent to the leading edge 121 along the circumferential direction and the suction surface 126 can be a smooth arc surface or a smooth inclined surface; the transition between one end of the guide groove 120 adjacent to the trailing edge 122 along the circumferential direction and the suction surface 126 can be a smooth arc surface or a smooth inclined surface.

[0049] Such a configuration enables the airflow to flow more smoothly through the leading edge 121 of the guide blade 12 to the suction surface 126 of the guide blade 12, and then flow more smoothly into the guide groove 120, flowing along the extension direction of the guide groove 120; then flow out of the guide groove 120 more smoothly, and finally flow out of the suction surface 126 of the guide blade 12 more smoothly through the trailing edge 122 of the guide blade 12, thereby ensuring the smoothness of the circumferential flow of the airflow along the axial flow wind wheel 1, thereby better reducing the noise and power of the axial flow wind wheel 1 during operation.

[0050] In some embodiments, the maximum depth of the guide groove 120 is greater than or equal to 0.5 mm and less than or equal to 2 / 3 of the thickness of the guide blade 12. This configuration ensures that the guide groove 120 has a good airflow guiding effect while also ensuring that the guide blade 12 has sufficient structural strength. This prevents the guide groove 120 from being too shallow to effectively guide the airflow, and also prevents the guide groove 120 from being too deep to affect the overall structural strength of the guide blade 12.

[0051] In a specific implementation, the number of the guide grooves 120 can be one or more. Specifically, one or more guide grooves 120 can be arranged on the guide blades 12 along the radial direction of the axial flow wheel 1 according to the radius size of the guide blades 12 .

[0052] In some embodiments, reference Figure 4 and Figure 9 As shown, along the circumference of the axial flow wind wheel 1 from the leading edge 121 to the trailing edge 122 , the width of the guide groove 120 along the radial direction of the axial flow wind wheel 1 gradually widens.

[0053] In other words, the width of the guide groove 120 varies along its extension direction. The guide groove 120 is narrowest at its starting position near the leading edge 121. It gradually widens along its extension direction, reaching its widest position near the trailing edge 122. This arrangement reduces the gas flow rate within the guide groove 120, thereby increasing the restraining force on the gas flow and improving the guiding effect of the guide groove 120 on the airflow.

[0054] For example, referring to Figure 9 As shown, the suction surface 126 of the guide blade 12 is provided with four guide grooves 120. For ease of description, the four guide grooves 120 are respectively defined as a first guide groove 120a, a second guide groove 120b, a third guide groove 120c, and a fourth guide groove 120d. Taking the first guide groove 120a as an example, the width of the first guide groove 120a varies along the extension direction. The first guide groove 120a is narrowest at the starting position near the leading edge 121, with a width of S1. Along the extension direction of the first guide groove 120a, the first guide groove 120a gradually widens and reaches its widest position near the trailing edge 122, with a width of E1, i.e., E1>S1.

[0055] In other embodiments, the width of the guide groove 120 along the radial direction of the axial flow wind wheel 1 is equal from the leading edge 121 to the trailing edge 122 along the circumference of the axial flow wind wheel 1. That is, along the extension direction of the guide groove 120, the width of the guide groove 120 is set to be equal. For example, referring to Figure 9 As shown, taking the first guide groove 120a as an example, E1=S1.

[0056] Such an arrangement makes the processing and design of the guide groove 120 more convenient, and the guiding effect of the guide groove 120 can also be utilized to make the air flow flow along the circumferential direction of the axial flow impeller 1.

[0057] In some embodiments, reference Figure 4 and Figure 9 As shown, there are multiple guide grooves 120, which are arranged at intervals along the radial direction of the axial flow rotor 1, and a partition is formed between two adjacent guide grooves 120. With this arrangement, when the axial flow rotor 1 is working, the multiple guide grooves 120 arranged at intervals can be used to refine the airflow into multiple small airflows. Each small airflow will flow along the extension direction of the corresponding guide groove 120, that is, flow along the circumferential direction of the axial flow rotor 1, which can reduce the air volume along the radial direction of the axial flow rotor 1 and avoid air volume loss, thereby increasing the air volume blown out axially by the axial flow rotor 1, and thus reducing the power of the axial flow rotor 1; at the same time, because the multiple guide grooves 120 refine the airflow into multiple small airflows, the vibration frequency of each small airflow is different. Therefore, when the multiple small airflows are blown out from the trailing edge of the guide blade 12, the multiple small airflows mix with each other, and the vibration frequency of the mixed airflow changes, the spectrum becomes wider, thereby reducing noise.

[0058] It should be noted that the guide groove 120 can be a groove structure formed on the suction surface 126 of the guide blade 12. Specifically, the guide groove 120 can be a groove structure formed by removing part of the material on the suction surface 126. The two adjacent guide grooves 120 are spaced radially along the axial flow wind wheel 1, and the surface on the suction surface 126 located between the two adjacent guide grooves 120 is retained to form a partition portion between the two adjacent guide grooves 120, thereby separating the airflow into multiple small airflows.

[0059] In some embodiments, reference Figure 4 and Figure 9 As shown, the guide blade 12 includes a blade root 124 adjacent to the hub 11 and a blade top 123 away from the hub 11 ; a plurality of guide grooves 120 are arranged in sequence along the radial direction of the axial flow wind wheel 1 from the blade top 123 to the blade root 124 .

[0060] In a specific implementation, multiple guide grooves 120 can be arranged on the entire suction surface 126 of the guide blade 12 along the radial direction of the axial flow wind wheel 1; of course, multiple guide grooves 120 can also be arranged on the local suction surface 126 of the guide blade 12 along the radial direction of the axial flow wind wheel 1, for example, a number of guide grooves 120 are arranged only in the position near the blade top 123, or a number of guide grooves 120 are arranged only in the position near the blade root 124, or a number of guide grooves 120 are arranged in the middle area between the blade top 123 and the blade root 124, all of which can achieve the function of guiding the airflow.

[0061] In some embodiments, reference Figure 4 and Figure 9 As shown, along the radial direction of the axial flow wind wheel 1 from the blade tip 123 to the blade root 124 , the relative widths of the plurality of guide grooves 120 gradually narrow.

[0062] That is to say, along the radial direction of the axial flow wind wheel 1 from the blade top 123 to the blade root 124, compared with two adjacent guide grooves 120, the guide groove 120 close to the blade root 124 is narrower in width at the corresponding position than the guide groove 120 close to the blade top 123.

[0063] For example, referring to Figure 9 As shown, four guide grooves 120 are provided on the suction surface 126 of the guide blade 12. The four guide grooves 120 are arranged in sequence along the radial direction of the axial flow wind wheel 1 from the blade tip 123 to the blade root 124. For ease of description, the four guide grooves 120 are respectively defined as a first guide groove 120a, a second guide groove 120b, a third guide groove 120c, and a fourth guide groove 120d. The relative widths of the four guide grooves 120 gradually narrow. That is, the width of the second guide groove 120b at the corresponding position relative to the first guide groove 120a is narrower, the width of the third guide groove 120c at the corresponding position relative to the second guide groove 120b is narrower, and the width of the fourth guide groove 120d at the corresponding position relative to the third guide groove 120c is narrower.

[0064] Specifically, the widths of the first guide groove 120a, the second guide groove 120b, the third guide groove 120c and the fourth guide groove 120d at the starting position near the leading edge 121 are S1, S2, S3 and S4 respectively, and the widths of the first guide groove 120a, the second guide groove 120b, the third guide groove 120c and the fourth guide groove 120d at the end position near the trailing edge 122 are E1, E2, E3 and E4 respectively, that is, S1>S2>S3>S4, E1>E2>E3>E4.

[0065] In addition, in order to ensure that each guide groove 120 has a good guiding effect, the maximum width of a guide groove 120 closest to the blade root 124 along the radial direction of the axial flow wind wheel 1 from the blade tip 123 to the blade root 124 should be greater than or equal to 10 mm. Figure 9 As shown, E4≥10mm.

[0066] In some embodiments, reference Figure 4 and Figure 9 As shown, the minimum distance between two adjacent guide grooves 120 along the radial direction of the axial flow impeller 1 from the blade tip 123 to the blade root 124 is not less than 2 mm. This ensures that the airflow is effectively separated between two adjacent guide grooves 120, allowing the airflow to be better divided into multiple streams and flow into multiple guide grooves 120.

[0067] For example, referring to Figure 9 As shown, the minimum distance between the first guide groove 120a and the second guide groove 120b is G1, the minimum distance between the second guide groove 120b and the third guide groove 120c is G2, and the minimum distance between the third guide groove 120c and the fourth guide groove 120d is G3. G1, G2, and G3 can be equal or unequal, but are all greater than or equal to 2 mm.

[0068] In addition, in order to ensure that a large number of guide grooves 120 can be arranged on the guide blade 12 to enhance the guiding effect on the airflow, the minimum distance between two adjacent guide grooves 120 should be less than or equal to 5 mm. Figure 9 As shown, G1, G2, and G3 are all less than or equal to 5 mm.

[0069] In some embodiments, reference Figure 4 and Figure 9 As shown, the minimum distance between the guide groove 120 closest to the hub 11 and the hub 11 is greater than 5 mm, and the minimum distance between the blade tip 123 of the guide blade 12 and the guide groove 120 closest to the blade tip 123 is greater than 3 mm. This arrangement ensures a certain distance between the outermost guide groove 120 and the blade tip 123 of the guide blade 12, and a certain distance between the innermost guide groove 120 and the blade root 124 of the guide blade 12, thereby ensuring sufficient structural strength of the guide blade 12.

[0070] For example, referring to Figure 9 As shown, the minimum distance between the guide groove 120 closest to the hub 11 and the hub 11 is B, and the minimum distance between the blade top 123 of the guide blade 12 and the guide groove 120 closest to the blade top 123 is T, T>3mm, B>5mm.

[0071] In some embodiments, reference Figure 9 As shown, the sum of the widths of the plurality of guide grooves 120 along the radial direction of the axial flow wind wheel 1 is A; A = R-0.5*DBT = E1+...+E n +G1+…+G n-1 ;

[0072] Wherein, R is the minimum radius of the guide blade 12, D is the diameter of the hub 11, B is the minimum distance between the guide groove 120 closest to the hub 11 and the hub 11, T is the minimum distance between the blade top 123 of the guide blade 12 and the guide groove 120 closest to the blade top 123, E n G is the maximum width of the Nth guide groove 120 in the direction from the blade tip 123 to the blade root 124 along the radial direction of the axial flow wind wheel 1, n-1 It is the minimum distance between the N-1th guide groove 120 and the Nth guide groove 120 in the direction from the blade tip 123 to the blade root 124 along the radial direction of the axial flow wind wheel 1.

[0073] Among them, 2mm≤G n-1 ≤5mm, T>3mm, B>5mm, E1≥E2≥…≥E n , and E n >10mm, E1≥A / n, n is an integer greater than 1.

[0074] Such an arrangement ensures that the guide blade 12 has sufficient structural strength and that the guide groove 120 has a good guide effect, so that the guide blade 12 can take into account both structural strength and guide effect.

[0075] In order to ensure the guiding effect of the guide groove 120, the guide groove 120 should meet the following requirements in the circumferential direction: First, the guide groove 120 should not be too far away from the leading edge 121 to prevent vortex shedding before the airflow enters the guide groove 120; Second, the guide groove 120 should not be too far away from the trailing edge 122 to prevent the constrained fluid from falling off from the blade top of the guide blade 12 after losing the constraint.

[0076] In some embodiments, reference Figure 9 As shown, the intersection points of the center line of the guide groove 120 extending in the circumferential direction and the extreme positions of the guide groove 120 in the circumferential direction are points Q and P, and the intersection points of the extension line of the center line of the guide groove 120 extending in the circumferential direction with the trailing edge 122 and the leading edge 121 are points M and N respectively. Point M is close to point Q, and point N is close to point P.

[0077] The angle formed by the line connecting point M and point N with the axis O of the hub 11 constitutes a first angle C1, the angle formed by the line connecting point M and point Q with the axis O of the hub 11 constitutes a second angle C2, and the angle formed by the line connecting point Q and point P with the axis O of the hub 11 constitutes a third angle C3; wherein, C2≤0.15C1, C3≥0.4C1.

[0078] That is to say, C2 cannot be too large to avoid the restraining effect on the airflow ending prematurely, causing the airflow to fall off from the top of the guide blade 12 after losing the restraint, resulting in air volume loss along the radial direction of the axial flow wind wheel 1; C3 cannot be too small, that is, the extension length of the guide groove 120 cannot be too small to avoid the guide groove 120 being unable to fully guide the airflow, causing the airflow to fall off from the top of the guide blade 12.

[0079] According to experimental tests, the noise of the axial flow fan wheel according to the embodiment of the present application can be reduced by 0.3dB under the same air volume compared to the axial flow fan wheel without the guide groove 120.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0081] The foregoing description is intended only to provide specific embodiments of the present application, which will enable those skilled in the art to understand and implement the present application. 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 application. Therefore, the present application is not limited to the embodiments described herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. An axial flow wind wheel, characterized in that: The invention comprises a hub and a plurality of guide vanes arranged at intervals in the circumferential direction of the hub, wherein the guide vanes have a leading edge and a trailing edge, and the leading edge is located in front of the trailing edge along the rotation direction of the guide vanes; A guide groove is provided on the suction surface of the guide blade. The guide groove extends along the circumference of the axial flow wind wheel between the leading edge and the trailing edge, and the two ends of the guide groove along the circumference are spaced from the leading edge and the trailing edge respectively.

2. The axial flow wind wheel according to claim 1, characterized in that: The guide groove is a groove structure formed on the suction surface of the guide blade; The suction surface of the guide blade near the leading edge and the trailing edge are both flat surfaces, and the bottom walls of the guide groove at both ends along the circumferential direction are smoothly transitioned to the suction surface.

3. The axial flow wind wheel according to claim 2, characterized in that: The maximum depth of the guide groove is greater than or equal to 0.5 mm and less than or equal to 2 / 3 of the thickness of the guide blade.

4. The axial flow wind wheel according to claim 1, characterized in that: Along the circumference of the axial flow wind wheel from the leading edge to the trailing edge, the width of the guide groove along the radial direction of the axial flow wind wheel is equal or gradually widens.

5. The axial flow wind wheel according to claim 1, characterized in that: There are multiple guide grooves, and the guide grooves are arranged at intervals along the radial direction of the axial flow wind wheel, and a partition portion is formed between two adjacent guide grooves.

6. The axial flow wind wheel according to claim 5, characterized in that: The guide blade has a blade root adjacent to the hub and a blade tip away from the hub; The plurality of guide grooves are arranged in sequence and spaced apart from the blade top to the blade root along the radial direction of the axial flow wind wheel.

7. The axial flow wind wheel according to claim 6, characterized in that: Along the radial direction of the axial flow impeller from the blade tip to the blade root, the relative widths of the plurality of guide grooves gradually narrow; And / or, along the radial direction of the axial flow wind wheel from the blade tip to the blade root, the minimum distance between two adjacent guide grooves is not less than 2 mm.

8. The axial flow wind wheel according to claim 7, characterized in that: The sum of the widths of the plurality of guide grooves along the radial direction of the axial flow wind wheel is A; A0R-0.5*DBTE1+...+E n +G1+...+G n-1 100. Among them, R is the minimum radius of the guide blade, D is the diameter of the hub, B is the minimum distance between the guide groove closest to the hub and the hub, T is the minimum distance between the blade tip of the guide blade and the guide groove closest to the blade tip, E n G is the maximum width of the Nth guide groove along the radial direction from the blade tip to the blade root of the axial flow rotor, n-1 The minimum distance between the N-1th guide groove and the Nth guide groove in the radial direction from the blade tip to the blade root of the axial flow wind wheel; Among them, 2mm≤G n-1 ≤5mm, T>3mm, B>5mm, E1≥E2≥…≥E n , and E n >10mm, E1≥A / n, n is an integer greater than 1.

9. The axial flow wind wheel according to claim 1, characterized in that: The intersection points of the midline of the guide groove extending in the circumferential direction and the extreme position of the guide groove in the circumferential direction are points Q and P, and the intersection points of the extension line of the midline of the guide groove extending in the circumferential direction with the trailing edge and the leading edge are points M and N respectively, with point M being close to point Q and point N being close to point P; The angle formed by the line connecting the axis O of the hub and the points M and N is a first angle C1, the angle formed by the line connecting the axis O of the hub and the points M and Q is a second angle C2, and the angle formed by the line connecting the axis O of the hub and the points Q and P is a third angle C3. Among them, C2≤0.15C1, C3≥0.4C1.

10. An air conditioner, characterized in that: The invention comprises a casing and the axial flow wind wheel according to any one of claims 1 to 9, wherein the axial flow wind wheel is installed in the casing.

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