Air guide ring, fan and air conditioner

Abstract

The invention discloses an air guide ring, a fan and an air conditioner, and belongs to the technical field of fans, the air guide ring comprises a main body, and an air inlet and an air outlet which communicate with an air duct are formed in the two ends, in the axial direction of the air duct, of the main body correspondingly; the main body comprises a first air guide section and a second air guide section which are connected, the first air guide section and the second air guide section are sequentially arranged in the direction from the air inlet to the air outlet, the air inlet is formed in the end, away from the second air guide section, of the first air guide section, and the section, perpendicular to the axis of the air duct, of the air inlet is provided with a first section. The edge of the first section comprises at least two straight line edges and at least two arc edges, the arc edges are connected between the adjacent straight line edges, the air guide ring has a larger air inlet circulation area, the distance from the boundary of the gradually-shrinking channel to the blade top of the wind wheel is increased, the air inlet uniformity can be improved, and the influence of turbulent flow on the air inlet side of the air channel on main flow can be weakened; therefore, the energy loss of the air duct is reduced, interference noise is reduced, and the energy-saving and noise-reducing effects are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to an air guide ring, a fan and an air conditioner. Background Art

[0002] The air guide ring is a key component for guiding airflow in the outdoor unit of the air conditioner. Its main function is to guide the airflow into the air duct, optimize the airflow direction, and improve the uniformity of the inlet airflow. At present, the air duct inlet of the air guide ring mostly adopts a cylindrical structure or a circular tapered structure. The cylindrical structure does not fully utilize the space, resulting in increased unevenness of the air intake and higher energy loss. In the circular tapered structure, the separated airflow generated at the starting position of the tapered is close to the blade top of the wind wheel, and the two interfere with each other, which in turn causes new energy loss and noise. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an air guide ring that can effectively reduce energy loss and noise in the air duct and has energy-saving and noise-reducing effects.

[0004] The present invention also provides a fan and an air conditioner comprising the air guide ring.

[0005] According to the first aspect of the embodiment of the present invention, the air guide ring includes a main body, which has an air duct, and the main body is respectively provided with an air inlet and an air outlet connected to the air duct at both ends along the axial direction of the air duct; the main body includes a first air guide section and a second air guide section connected to each other, and along the axial direction of the air duct, the first air guide section and the second air guide section are arranged in sequence from the air inlet to the air outlet, and the inner diameter of the first air guide section gradually decreases, the air inlet is formed at one end of the first air guide section away from the second air guide section, and the cross-section of the air inlet position perpendicular to the axis of the air duct has a first cross-section, and the edge of the first cross-section includes at least two straight edges and at least two arc edges, the arc edges are connected between adjacent straight edges, and the arc edges are tangent to the straight edges.

[0006] The air guide ring according to the embodiment of the present invention has at least the following beneficial effects: The air guide ring of the embodiment of the present invention has a main body comprising a first air guide section and a second air guide section, the first air guide section and the second air guide section are arranged in sequence from the air inlet to the air outlet, the air inlet is formed at one end of the first air guide section away from the second air guide section, the inner diameter of the first air guide section is set to gradually decrease from the air inlet toward the air outlet, that is, a tapered channel is formed in the first air guide section, the cross section at the air inlet position perpendicular to the axis of the air duct has a first cross section, the first cross section is the starting position of the tapered channel, the edge of the first cross section comprises at least two straight edges and at least two arc edges, The arc edge is connected between adjacent straight edges, and the arc edge is tangent to the straight edge, so that the shape of the first cross-section is set to a polygon with an arc edge and a straight edge. The tangency makes the arc edge and the straight edge transition smoothly at the connection point. Compared with a cylindrical or circular tapered structure, it has a larger air inlet flow area, increases the distance from the boundary of the tapered channel to the blade top of the wind wheel, can improve the uniformity of the intake air and weaken the influence of turbulence on the air inlet side of the air duct on the mainstream, thereby reducing the energy loss of the air duct, reducing interference noise, and achieving the effect of energy saving and noise reduction. It is suitable for the outdoor unit of the air conditioner.

[0007] According to some embodiments of the present invention, the shape of the first cross-section is a rounded rectangle, the connection position between the first air guide segment and the second air guide segment is perpendicular to the second cross-section of the air duct axis, the shape of the second cross-section is circular, and the wall surface of the first air guide segment between the first cross-section and the second cross-section is a transition curved surface.

[0008] According to some embodiments of the present invention, a cross-sectional contour line of the transition curved surface along the radial direction of the air duct includes at least one arc segment and / or at least one straight line segment.

[0009] According to some embodiments of the present invention, the cross-sectional contour line has more than two arc segments, and adjacent arc segments are tangent to each other; Alternatively, the cross-sectional contour line comprises the arc segment and the straight line segment, and the arc segment and the straight line segment are tangent to each other. According to some embodiments of the present invention, the cross-sectional contour line includes the arc segment or the straight line segment, and the length of the arc segment or the straight line segment changes continuously along the circumference of the air duct; Alternatively, the cross-sectional contour line includes the arc segment and the straight line segment, and the length of the arc segment and the length of the straight line segment respectively change continuously along the circumference of the air duct.

[0010] According to some embodiments of the present invention, the edge of the first section includes four straight edges and four arc edges, the straight edges are arranged opposite to each other in pairs, the arc edges are respectively connected between two adjacent straight edges, and the distance between two opposite straight edges is greater than or equal to the diameter of the second section.

[0011] According to some embodiments of the present invention, the length of the cross-sectional contour line of the transition curved surface along the radial direction of the air duct gradually increases from the midpoint of the straight edge to the midpoint of the arc edge.

[0012] According to some embodiments of the present invention, a cross section of the second air guiding segment perpendicular to the axis of the air duct has a third cross section, and the shape of the third cross section is circular.

[0013] According to some embodiments of the present invention, a chamfer is formed at a connection position between the first air guide segment and the second air guide segment; Alternatively, at a connection position between the first air guiding segment and the second air guiding segment, a radial cross-sectional contour line of the first air guiding segment along the air duct is arranged tangent to a wall surface of the second air guiding segment.

[0014] According to some embodiments of the present invention, the main body also includes a third air guide segment, which is connected to the second air guide segment, and the air outlet is formed at one end of the third air guide segment away from the second air guide segment, and the inner diameter of the third air guide segment gradually decreases in a direction away from the second air guide segment.

[0015] A wind turbine according to an embodiment of the second aspect of the present invention comprises a wind wheel, a motor and the wind guide ring described in the embodiment of the first aspect, wherein the wind wheel is at least partially located in the air duct, and the motor is used to drive the wind wheel to rotate.

[0016] The fan according to the embodiment of the present invention has at least the following beneficial effects: The fan adopts the air guide ring of the first aspect embodiment, has a larger air inlet flow area, increases the distance from the boundary of the tapered channel to the blade top of the wind wheel, can improve the uniformity of the intake air and weaken the impact of turbulence on the air inlet side of the air duct on the mainstream, thereby reducing the energy loss of the air duct and reducing interference noise, and can achieve the effect of energy saving and noise reduction of the fan.

[0017] An air conditioner according to an embodiment of the third aspect of the present invention comprises the fan described in the embodiment of the second aspect.

[0018] The air conditioner according to the embodiment of the present invention has at least the following beneficial effects: The air conditioner adopts the fan of the second embodiment, and the fan is suitable for the outdoor unit of the air conditioner, and can achieve the energy-saving and noise-reducing effect of the air conditioner.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 It is a schematic diagram of assembling an air guide ring and a wind wheel according to an embodiment of the present invention; Figure 2 A three-dimensional structural view of an air guide ring according to an embodiment of the present invention; Figure 3 This is a front structural view of an air guide ring according to an embodiment of the present invention; Figure 4 A comparison diagram of a rounded rectangular air inlet of an embodiment of the present invention and a circular air inlet of a traditional air guide ring; Figure 5 for Figure 3 Schematic diagram of the first section in the AA direction; Figure 6 for Figure 5 Schematic diagram of the enlarged structure at D in the middle; Figure 7 for Figure 3 Schematic diagram of the second section in the middle BB direction; Figure 8 for Figure 3 Schematic diagram of the third section in the mid-CC direction; Fig. 9 A comparison of the air inlet flow field between an air guide ring according to an embodiment of the present invention and a traditional air guide ring structure; Fig.10 The figure shows the energy consumption and noise comparison between the air guide ring of the embodiment of the present invention and the traditional air guide ring structure.

[0021] Figure Number: Air guide ring 1000; Main body 100; air inlet 101; air outlet 102; air duct 103; first air guide section 110; first cross section 111; straight edge 1111; arc edge 1112; second cross section 112; transition curved surface 113; cross section contour line 114; arc segment 1141; tapered channel 115; second air guide section 120; third cross section 121; third air guide section 130; expansion channel 131; first section 140; second section 150; third section 160; Circular air inlet 200; Wind wheel 2000; blade tip 2100. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it is necessary to understand that the descriptions involving orientations, such as axial, circumferential, radial, etc., the orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] The outdoor unit of the air conditioner is an important part of the air conditioning system, which is mainly responsible for the heat exchange between the refrigerant and the outside world. The fan of the outdoor unit includes structural parts such as the wind wheel, air guide ring and mesh cover. Its main function is to guide the air flow to strengthen the heat exchange between the outdoor unit and the outside world. The fan can directly affect the cooling effect, energy efficiency ratio and noise performance of the air conditioner. With the increasing demand of users for energy saving and quietness, it is an inevitable trend to reduce the energy consumption and working noise of the outdoor unit as much as possible.

[0027] The air guide ring is a key component for guiding airflow in the outdoor unit. Its main function is to guide the airflow into the air duct, optimize the airflow direction, and improve the uniformity of the inlet flow. At present, the air duct inlet of the air guide ring mostly adopts a cylindrical structure or a circular tapered structure. The cylindrical structure does not fully utilize the space, resulting in increased unevenness of the air intake and higher energy loss. In the circular tapered structure, the separation airflow generated at the starting position of the tapered is close to the blade top of the wind wheel, and the two interfere with each other, which in turn causes new energy loss and noise. Therefore, controlling the flow of the air guide ring inlet is very important for energy saving and noise reduction of the outdoor unit.

[0028] To this end, an embodiment of the present invention proposes an air guide ring 1000 suitable for an air conditioner outdoor unit. By optimizing the air duct 103 of the air guide ring 1000, the energy loss and interference noise of the air duct 103 can be effectively reduced, thereby achieving energy saving and noise reduction effects.

[0029] Reference Figure 1 and Figure 2As shown, in some embodiments, the air guide ring 1000 includes a main body 100, which is ring-shaped, and an air duct 103 is formed on the inner side of the main body 100. The main body 100 is provided with an air inlet 101 and an air outlet 102 at both ends of the axial direction of the air duct 103, respectively. The air inlet 101 and the air outlet 102 are respectively connected to the air duct 103, and the airflow is guided to flow from the air inlet 101 to the air outlet 102 through the air duct 103.

[0030] Among them, the main body 100 includes a first air guiding section 110, a second air guiding section 120 and a third air guiding section 130. Along the axial direction of the air duct 103, the first air guiding section 110, the second air guiding section 120 and the third air guiding section 130 are arranged in sequence from the air inlet 101 to the air outlet 102. The first air guiding section 110, the second air guiding section 120 and the third air guiding section 130 jointly define the air outlet 103. The end of the first air guiding section 110 away from the second air guiding section 120 forms the air inlet 101, and the end of the third air guiding section 130 away from the second air guiding section 120 forms the air outlet 102. The airflow enters the air duct 103 from the air inlet 101, passes through the first air guiding section 110, the second air guiding section 120 and the third air guiding section 130 in sequence, and then flows out from the air outlet 102. The first air guiding section 110, the second air guiding section 120 and the third air guiding section 130 respectively guide the airflow.

[0031] Reference Figure 2 As shown, in the embodiment, the first air guide section 110 is the inlet section, the second air guide section 120 is the middle section, the third air guide section 130 is the outlet section, the air inlet 101 is located in the inlet section, the air outlet 102 is located in the outlet section, the inlet section, the middle section and the outlet section are sequentially connected along the direction from the air inlet 101 to the air outlet 102, and can be fixedly connected by integral molding, for example, the main body 100 is integrally injection molded by engineering plastic. The side of the main body 100 where the air inlet 101 is located is the air inlet side, and the side where the air outlet 102 is located is the air outlet side.

[0032] The inner diameter of the first air guide section 110 gradually decreases from the air inlet 101 to the second air guide section 120, that is, a tapered channel 115 is formed in the first air guide section 110, which helps to accelerate the airflow and reduce turbulence at the air inlet 101. In some embodiments, the tapered angle can be 5°-15°, and the ratio of the length of the tapered channel 115 to the total length of the air duct 103 can be 0.3-0.4.

[0033] In the embodiment, the second air guide section 120 is a straight cylinder structure, that is, the second air guide section 120 has an equal diameter channel, and its inner diameter remains unchanged along the axial direction. It can be understood that the inner diameter of the second air guide section 120 is equal to the minimum inner diameter of the first air guide section 110. The airflow passing through the first air guide section 110 is guided to the third air guide section 130 by the second air guide section 120, which plays a role in stabilizing the flow.

[0034] The inner diameter of the third air guide section 130 gradually increases from the air inlet 101 to the air outlet 102, forming an expansion channel 131, which helps to slow down the diffusion of the airflow. In some embodiments, the expansion angle of the third air guide section 130 is 5°-15° to balance the airflow diffusion and pressure loss. The ratio of the length of the expansion channel 131 to the total length of the air duct 103 is 0.3-0.4.

[0035] It is understandable that after the airflow enters the air duct 103 from the air inlet 101, it first flows through the first air guide section 110, then passes through the second air guide section 120, and finally enters the third air guide section 130. The inner diameter of the first air guide section 110 gradually decreases, so that the airflow is accelerated and the kinetic energy is increased; the equal diameter channel of the second air guide section 120 can avoid sudden changes in flow rate and play a role in transitional stabilization; the expansion channel 131 of the third air guide section 130 plays a role in diffusion deceleration.

[0036] In other embodiments, the air guide ring 1000 only includes a first air guide section 110 and a second air guide section 120. The air flow flows out of the air guide ring 1000 after passing through the first air guide section 110 and the second air guide section 120. The second air guide section 120 can be connected to the outer casing of the outdoor unit or other air duct structures.

[0037] Reference Figure 2 and Figure 3 As shown, the cross-section at the air inlet 101 has a first cross-section 111, and the cross-section at the air inlet 101 is specifically a cross-section perpendicular to the axial direction of the air duct 103 at the air inlet 101. The edge of the first cross-section 111 includes four straight edges 1111 and four arc edges 1112. The straight edges 1111 and the arc edges 1112 are alternately connected. The four straight edges 1111 are arranged opposite to each other in pairs. Two opposite straight edges 1111 are parallel to each other. The arc edges 1112 are connected between adjacent straight edges 1111 to form a rounded rectangle, that is, the shape of the first cross-section 111 is a rounded rectangle.

[0038] The connection between the arc edge 1112 and the straight edge 1111 is tangent, which makes the arc edge 1112 and the straight edge 1111 transition smoothly at the connection point, ensuring that there are no sharp corners and reducing airflow separation and turbulence. The radius of curvature of the arc edge 1112 can be set according to the maximum inner diameter of the air inlet 101. For example, the radius of curvature of the arc edge 1112 is 0.1 times to 0.3 times the maximum inner diameter of the air inlet 101. The maximum inner diameter of the air inlet 101 can be understood as the diameter of the circumscribed circle of the rounded rectangle.

[0039] The air inlet of a conventional air guide ring is circular, and the inner diameter of the air duct can be gradually reduced or set with the same inner diameter along the direction from the air inlet to the air outlet, forming a circular tapered structure or a cylindrical structure. The air inlet 101 of the embodiment of the present invention is a rounded rectangle. When the minimum inner diameter remains unchanged, the rounded rectangle has a larger area than the circle. Therefore, the rounded rectangular air inlet 101 of the embodiment of the present invention has a larger air inlet 101 flow area than the circular air inlet 200 of the conventional air guide ring.

[0040] Reference Figure 4 As shown, Figure 4 The air inlet 101 shown is for explanation by way of example, wherein the rounded rectangle is the shape of the air inlet 101 of the embodiment of the present invention, and the circle within the rounded rectangle is the circular air inlet 200 of the traditional air guide ring. It can be understood that the size of the air inlet 101 of the air guide ring 1000 is related to the size of the wind wheel 2000, and when the diameter of the wind wheel 2000 remains unchanged, the minimum inner diameter of the air inlet 101 of the air guide ring 1000 cannot be less than the diameter of the wind wheel 2000. The diameter of the circular air inlet 200 does not exceed the distance between the two opposite straight edges 1111 in the rounded rectangle. The distance between the two opposite straight edges 1111 in the rounded rectangle is the diameter of the inscribed circle of the rounded rectangle. Therefore, when the diameter of the circular air inlet 200 is close to or equal to the diameter of the inscribed circle of the rounded rectangle, the rounded rectangular air inlet 101 has a larger flow area than the circular air inlet 200, with an increase of 10%-20%, which helps to improve the uniformity of air intake, reduce wind resistance, improve operating efficiency, and reduce noise.

[0041] Reference Figure 1 As shown, in the embodiment of the present invention, the fan is an axial flow fan. After the airflow enters the air duct 103 from the air inlet 101, it first flows through the tapered channel 115 of the first air guide section 110, accelerates and initially uniformizes; then enters the equal diameter channel of the second air guide section 120, the flow velocity tends to be stable, and the turbulence intensity is reduced. The rounded rectangular air inlet 101 increases the distance from the boundary of the tapered channel 115 to the blade top 2100 of the wind wheel 2000, and the separation vortex generation position is far away from the core flow area, which weakens the influence on the mainstream, reduces the interference noise, and makes the fan more efficient, wherein the separation vortex generation position is the boundary position of the air inlet 101, and the core flow area can be understood as the projection area of ​​the wind wheel 2000 along the axial direction of the air duct 103.

[0042] Reference Fig. 9 As shown, Fig. 9 1 is a comparison of the air inlet flow field of the air guide ring 1000 of the embodiment of the present invention and the traditional air guide ring structure. Fig. 9In the figure a is the air intake flow field distribution diagram of the air guide ring 1000 of the embodiment of the present invention, and in the figure b is the air intake flow field distribution diagram of the traditional air guide ring. Experiments show that by comparing the above two distribution diagrams, it can be seen that the air intake fields at the four positions indicated by the arrows in the figure have changed significantly. Compared with the traditional air guide ring, the air intake uniformity of the embodiment of the present invention is improved, and the energy loss of the air duct 103 is reduced.

[0043] Reference Fig.10 As shown, Fig.10 The energy consumption and noise comparison between the air guide ring 1000 of the embodiment of the present invention and the traditional air guide ring structure are shown in FIG. Fig.10 The new air guide ring in the table shows the air guide ring of the embodiment of the present invention, Q represents the air volume, P represents the fan power, SPL represents the noise, and the air volume of the traditional air guide ring and the air guide ring of the embodiment of the present invention when working in the test is 2400m 3 / h. By comparison, it can be seen that under the condition of the same air volume, the air guide ring 1000 of the embodiment of the present invention has lower working power than the traditional air guide ring, the power can be reduced by more than 8%, and the noise can be reduced by 1dBA-3dBA, so as to achieve the purpose of reducing the energy loss and noise of the air duct 103, have the effect of energy saving and noise reduction, and is suitable for scenes that are sensitive to energy efficiency and noise, such as air-conditioning outdoor units.

[0044] The air guide ring 1000 of the above embodiment is applied to the outdoor unit. The function of the air guide ring 1000 is to guide the air flow. The air inlet 101 of the air guide ring 1000 can be set toward the heat exchanger of the outdoor unit. The air inlet flow area is increased, the air intake uniformity of the heat exchanger is improved, the heat exchanger resistance is reduced, the operating efficiency is improved, the speed of the fan can be reduced, and the purpose of noise reduction and energy saving can be achieved. In some embodiments, the edge of the first section 111 at the air inlet 101 position includes two straight edges 1111 and two arc edges 1112, the two straight edges 1111 are arranged opposite to each other and parallel to each other, the two arc edges 1112 are respectively connected between the two straight edges 1111, and the connection between the arc edges 1112 and the straight edges 1111 is through a tangent transition, wherein the arc edges 1112 are semicircular, and the curvature radius of the arc edges 1112 is equal to half of the spacing of the straight edges 1111, that is, the middle of the first section 111 is a rectangular part, and the two ends are semicircles, and the overall shape is a runway.

[0045] It can be understood that the distance between the two straight edges 1111 is the diameter of the inscribed circle of the first section 111. When the diameter of the traditional circular air inlet 200 is close to or equal to the diameter of the inscribed circle, the runway-shaped air inlet 101 has a larger flow area than the circular air inlet 200. Increasing the distance from the boundary of the tapered channel 115 to the blade top 2100 of the wind wheel 2000 can improve the uniformity of the intake air and reduce the impact of turbulence on the air inlet side of the air duct 103 on the mainstream, thereby reducing the energy loss of the air duct 103 and reducing interference noise, thereby achieving the effect of energy saving and noise reduction.

[0046] Of course, the shape of the first section 111 is not limited to a rounded rectangle or a runway shape. The edge of the first section 111 may include at least two straight edges 1111 and at least two arc edges 1112. For example, the edge of the first section 111 is formed by alternating six straight edges 1111 and six arc edges 1112, which can adapt to higher flow rate requirements and achieve the purpose of reducing energy loss and noise in the air duct 103.

[0047] Reference Figure 2 and Figure 3 As shown, the cross section of the connection position between the first air guide section 110 and the second air guide section 120 has a second cross section 112, which is specifically a cross section perpendicular to the axial direction of the air duct 103 at the connection position. The second cross section 112 is the terminal position of the tapered channel 115. In the embodiment, the shape of the second cross section 112 is circular, that is, the cross section at the starting position of the first air guide section 110 is a rounded rectangle, and the cross section at the terminal position is circular. The wall surface of the first air guide section 110 between the first cross section 111 and the second cross section 112 is a transition curved surface 113, which can be understood as the inner wall surface of the tapered channel 115. Among them, the position where the first cross section 111 is located can be a free boundary, or it can be connected to other air inlet structures. For example, the air inlet 101 of the first air guide section 110 can be connected to the air inlet pipe.

[0048] In a traditional air guide ring, the air inlet is circular. When the inner diameter of the air duct gradually decreases from the air inlet to the air outlet, the air inlet shrinks in a trumpet shape, and the cross sections at different positions in the air duct are all circular. In the embodiment of the present invention, since the cross section at the air inlet 101 is a rounded rectangle, the transition surface 113 transitions from the first section 111 to the second section 112, and the cross sections of the transition surface 113 at different positions along the axial direction are not circular. The closer to the air inlet 101, the closer the cross section of the transition surface 113 is to a rounded rectangle, and the closer to the second section 112, the closer the cross section of the transition surface 113 is to a circle. Compared with the trumpet-shaped shrinking structure of the traditional air guide ring, the transition surface 113 has a larger flow area, and can achieve the purpose of gradually reducing the inner diameter of the first air guide section 110, which helps to accelerate the airflow.

[0049] Specifically, the transition surface 113 is an arc-shaped surface, which guides the airflow more smoothly and reduces airflow separation and turbulence. The shape of the transition surface 113 is set according to the shape of the first section 111. When the first section 111 is a rounded rectangle, the starting position of the transition surface 113 is composed of an edge consisting of a straight edge 1111 and an arc edge 1112. The bending deformation of the transition surface 113 needs to satisfy the transition from a rounded rectangular section to a circular section.

[0050] Reference Figure 5 and Figure 6 As shown, the radial cross-sectional contour line 114 of the transition surface 113 along the air duct 103 includes an arc segment 1141, one end of the arc segment 1141 is connected to the first section 111, and the other end is connected to the second section 112. The arc segment 1141 can specifically be a circular arc segment 1141, which has a continuously changing curvature, which can gradually transition the fluid flow direction, reduce sudden changes in flow velocity, avoid flow separation and vortex generation, and thus reduce turbulent energy loss. Figure 5 , a cross section of the main body 100 is shown, and the cross-sectional contour line 114 is the contour line of the cross-sectional position, which may specifically be the contour line of the inner wall of the air duct 103 .

[0051] It should be noted that the number of arc segments 1141 is not limited to one, and can be a combination of two or more arc segments 1141. For example, two arc segments 1141 are connected in sequence along the direction from the first section 111 to the second section 112, and the two arc segments 1141 are arranged tangent to each other. The tangency allows the two arc segments 1141 to smoothly transition at the connection point, ensuring that there are no sharp corners and reducing airflow separation and turbulence.

[0052] In other embodiments, the radial cross-sectional contour line 114 of the transition curved surface 113 along the air duct 103 includes a straight line segment, one end of the straight line segment is connected to the first cross section 111, and the other end is connected to the second cross section 112. The straight line segment can gradually transition the flow direction of the fluid, reduce sudden changes in flow velocity, avoid flow separation and vortex generation, and thus reduce turbulent energy loss. It should be noted that the number of straight line segments is not limited to one segment, and can be a combination of two or more straight line segments. For example, multiple straight line segments are sequentially connected along the direction from the first cross section 111 to the second cross section 112, and the angle between adjacent straight line segments is an obtuse angle, which reduces wind resistance.

[0053] In other embodiments, the cross-sectional contour line 114 of the transition curved surface 113 along the radial direction of the air duct 103 includes at least one arc segment 1141 and at least one straight segment. For example, it can be a combination of an arc segment 1141 and a straight segment, and the arc segment 1141 and the straight segment are tangent to each other; it can also be a combination of two arc segments 1141 and a straight segment, and the straight segment is connected between the two arc segments 1141, and the arc segment 1141 and the straight segment are tangent to each other. Different cross-sectional contour lines 114 can be selected according to the specific length of the transition curved surface 113 or the wind guide requirements to ensure that a tapered channel 115 is formed from the first section 111 to the second section 112. By adjusting different combinations of cross-sectional contour lines 114, the transition change of the transition curved surface 113 can be controlled to adapt to the wind guide requirements.

[0054] Reference Figure 3 As shown, it can be understood that since the shape of the first section 111 is a rounded rectangle, the radial distance between the first section 111 and the second section 112 changes along the circumference of the main body 100, and the cross-sectional contour line 114 of the transition surface 113 has different sizes at different positions, and the size changes continuously. The transition surface 113 transitions from a rounded rectangle to a circle, and the distance between the straight edge 1111 and the arc edge 1112 and the second section 112 gradually increases or decreases with the position, rather than suddenly changing the value at a certain position, that is, the change of the dimensional parameter is smooth, without jumps or steps, that is, the size is not only continuous in value, but also its rate of change remains consistent, avoiding sharp inflection points or sudden acceleration changes.

[0055] Reference Figure 5 , Figure 7 and Figure 8 As shown, Figure 5 The first section 140 of the main body 100 is shown at an inclination angle of 0°. Figure 7 The second section 150 of the main body 100 is shown at an inclination angle of 22°. Figure 8 The third section 160 of the main body 100 is shown when the inclination angle is 45°, with the vertical direction being used as a reference line, and the angle between the section line and the reference line being the inclination angle.

[0056] It can be understood that the length of the cross-sectional contour line 114 at the second section 150 is greater than the length of the cross-sectional contour line 114 at the first section 140, and the length of the cross-sectional contour line 114 at the third section 160 is greater than the length of the cross-sectional contour line 114 at the second section 150. The position corresponding to the first section 140 is the midpoint position of the straight edge 1111, where the length of the arc segment 1141 is the smallest; the position corresponding to the third section 160 is the midpoint position of the arc edge 1112, that is, the arc segment 1141 is the smallest. The length of segment 1141 changes continuously along the circumference of the air duct 103, and the length of the arc segment 1141 gradually increases from the midpoint of the straight edge 1111 to the midpoint of the arc edge 1112, so that there is a longer curved surface between the arc edge 1112 and the second section 112, ensuring that there is a sufficiently large distance between the boundary of the tapered channel 115 and the blade top 2100 of the wind wheel 2000, so that the separation vortex occurs away from the core flow area, the influence on the mainstream is weakened, the interference noise is effectively reduced, and the efficiency of the fan is improved.

[0057] In the embodiment, the cross-sectional contour lines 114 in the first section 140, the second section 150 and the third section 160 all include an arc segment 1141, and the length of the arc segment 1141 varies along the circumference of the air duct 103. That is, the composition of the cross-sectional contour line 114 of any section in the circumference of the air duct 103 remains unchanged, and the size changes continuously. For example, when the cross-sectional contour lines 114 all include two arc segments 1141, the cross-sectional contour line 114 of any section in the circumference of the air duct 103 also includes two arc segments 1141.

[0058] Of course, the cross-sectional contour line 114 is not limited to the arc segment 1141. If the cross-sectional contour line 114 includes a straight line segment, the length of the straight line segment changes continuously along the circumference of the air duct 103, and the length of the straight line segment gradually increases from the midpoint of the straight edge 1111 to the midpoint of the arc edge 1112. If the cross-sectional contour line 114 includes an arc segment 1141 and a straight line segment, the length distribution of the arc segment 1141 and the straight line segment changes continuously along the circumference of the air duct 103, and the length of the arc segment 1141 and the straight line segment gradually increases from the midpoint of the straight edge 1111 to the midpoint of the arc edge 1112.

[0059] The dimensional variation rule of the transition curved surface 113 in the embodiment of the present invention ensures a natural transition of the overall shape, avoids stress concentration, and satisfies continuous conductance without discontinuities. Such continuity ensures manufacturability and functionality.

[0060] Considering that the airflow transitions from the first air guide section 110 to the second air guide section 120, if there is a sharp corner at the transition position between the two, it will cause the airflow to separate, forming a vortex area, resulting in local pressure drop and energy loss. Therefore, in some embodiments, the connection position between the first air guide section 110 and the second air guide section 120 is rounded, and the rounded corner eliminates sharp edges through smooth transition, reduces turbulence intensity, and reduces local resistance; and the rounded corner can disperse the impact force of the airflow on the wall, reducing the noise or vibration caused by the high-speed airflow directly hitting the wall.

[0061] In other embodiments, at the connection position between the first air guide section 110 and the second air guide section 120, the cross-sectional contour line 114 of the first air guide section 110 along the radial direction of the air duct 103 is tangent to the wall surface of the second air guide section 120, so that the contour lines of the two air guide sections are tangent and continuous at the connection point, ensuring a smooth transition of the geometric shape and avoiding flow separation caused by cross-sectional mutations. The tangent design allows the airflow to turn naturally along the wall surface, reducing interference with the mainstream direction and playing a role in noise reduction. When the cross-sectional contour line 114 of the first air guide section 110 is tangent to the wall surface of the second air guide section 120, no rounding is required.

[0062] The second air guide section 120 is a straight cylinder structure, and the cross section of the second air guide section 120 has a third cross section 121. The cross section of the second air guide section 120 is specifically a cross section perpendicular to the axial direction of the air duct 103 at the second air guide section 120. The shape of the third cross section 121 is circular. In the embodiment, the diameters of the second cross section 112 and the third cross section 121 are equal. The second air guide section 120 guides the airflow passing through the first air guide section 110 to the third air guide section 130, which plays a role in stabilizing the flow. The inner diameter of the third air guide section 130 gradually decreases in the direction away from the second air guide section 120, forming an expansion channel 131.

[0063] After the airflow enters the air duct 103 from the air inlet 101, it first flows through the tapered channel 115 of the first air guide section 110, accelerates and initially homogenizes; then enters the equal diameter channel of the second air guide section 120, the flow velocity tends to be stable, and the turbulence intensity decreases; finally enters the third air guide section 130, which plays a role of diffusion and deceleration. The rounded rectangular air inlet 101 increases the distance from the boundary of the tapered channel 115 to the blade top 2100 of the wind wheel 2000, and the location where the separation vortex occurs is far away from the core flow area, which weakens the impact on the mainstream, reduces interference noise, and makes the fan more efficient.

[0064] It should be noted that the third air guide section 130 can be connected to the housing of the outdoor unit or to the downstream air duct to adapt to different air outlet requirements. For example, the third air guide section 130 can be connected to the exhaust duct.

[0065] Considering that the air outlet of the traditional air guide ring is mostly cylindrical, the structure does not fully utilize the space, which easily leads to the airflow still having a large average speed and pulsation speed when it flows out of the air guide ring, thereby generating a high energy loss, and the high-speed unstable airflow is easy to hit the downstream structural parts, thereby causing new energy loss and noise. To this end, in some embodiments, the present invention optimizes and adjusts the air outlet 102 of the air guide ring 1000.

[0066] Specifically, the cross section at the position of the air outlet 102 has a fourth cross section, which is specifically a cross section perpendicular to the axis of the air duct 103 at the air outlet 102. The shape of the fourth cross section is a rounded rectangle. Compared with the circular air outlet of the traditional air guide ring, the rounded rectangular air outlet 102 of the embodiment has a larger flow area, which reduces the average flow velocity of the air outlet 102, thereby increasing the outlet airflow kinetic energy recovery rate, and reducing the air duct resistance, improving the efficiency of the fan, reducing power and speed, and having a noise reduction effect due to the positive correlation between noise and speed under the same flow characteristics. Moreover, by increasing the axial flow velocity in the blade tip 2100 area and accelerating the migration of the leakage vortex downstream, the collision area between the leakage vortex and the blade can be reduced, thereby achieving noise reduction.

[0067] An embodiment of the present invention further proposes a wind fan, which is an axial flow fan, specifically including a wind wheel 2000, a motor and the wind guide ring 1000 of the above embodiment. The wind wheel 2000 may be partially located in the wind duct 103, or the entire wind wheel 2000 may be located in the wind duct 103. The central axis of the wind wheel 2000 coincides with the central axis of the wind guide ring 1000, and the motor is used to drive the wind wheel 2000 to rotate.

[0068] The fan adopts the air guide ring 1000 of the above-mentioned embodiment, has a larger flow area of ​​the air inlet 101, and increases the distance from the boundary of the tapered channel 115 to the blade top 2100 of the wind wheel 2000, which can improve the uniformity of the intake air and reduce the impact of turbulence on the air inlet side of the air duct 103 on the mainstream, thereby reducing the energy loss of the air duct 103 and reducing interference noise, thereby achieving the effect of energy saving and noise reduction of the fan.

[0069] When the fan is used in the outdoor unit of the air conditioner, the fan is installed on the bracket of the outdoor unit. The bracket is located upstream of the air inlet 101 of the air guide ring 1000. The average speed at the ventilation volume decreases due to the improved uniformity of the heat exchanger's air intake, so that the wind resistance and turbulent noise generated by the bracket are reduced, which is beneficial to improving efficiency and reducing noise; and the windward area is increased, which improves the uniformity of the heat exchanger's air intake, reduces the heat exchanger's resistance, improves the operating efficiency, and reduces the rotation speed, thereby achieving the purpose of energy saving and noise reduction.

[0070] An embodiment of the present invention also provides an air conditioner, including the fan of the above embodiment. The air conditioner can be a split air conditioner, including an outdoor unit and an indoor unit. The fan is installed in the outdoor unit, which can achieve the energy-saving and noise-reducing effect of the air conditioner.

[0071] Since the air conditioner adopts all the technical solutions of the fan of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0072] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An air guide ring, characterized in that: include: The main body has an air duct, and the main body is provided with an air inlet and an air outlet connected to the air duct at two ends along the axial direction of the air duct respectively; The main body includes a first air guide section and a second air guide section connected to each other. Along the axial direction of the air duct, the first air guide section and the second air guide section are arranged sequentially from the air inlet to the air outlet, and the inner diameter of the first air guide section gradually decreases. The air inlet is formed at one end of the first air guide section away from the second air guide section. The cross-section at the position of the air inlet perpendicular to the axis of the air duct has a first cross-section, and the edges of the first cross-section include at least two straight edges and at least two arc edges, the arc edges are connected between adjacent straight edges, and the arc edges are tangent to the straight edges.

2. The air guide ring according to claim 1, characterized in that: The shape of the first cross-section is a rounded rectangle, the cross-section at the connection position between the first air guide segment and the second air guide segment perpendicular to the axis of the air duct has a second cross-section, the shape of the second cross-section is a circle, and the wall surface of the first air guide segment between the first cross-section and the second cross-section is a transition curved surface.

3. The air guide ring according to claim 2, characterized in that: The cross-sectional contour line of the transition curved surface along the radial direction of the air duct includes at least one arc segment and / or at least one straight line segment.

4. The air guide ring according to claim 3, characterized in that: The cross-sectional contour line has more than two arc segments, and adjacent arc segments are tangent to each other; Alternatively, the cross-sectional contour line comprises the arc segment and the straight line segment, and the arc segment and the straight line segment are tangent to each other.

5. The air guide ring according to claim 3, characterized in that: The cross-sectional contour line includes the arc segment or the straight line segment, and the length of the arc segment or the straight line segment changes continuously along the circumference of the air duct; Alternatively, the cross-sectional contour line includes the arc segment and the straight line segment, and the length of the arc segment and the length of the straight line segment respectively change continuously along the circumference of the air duct.

6. The air guide ring according to claim 2, characterized in that: The edge of the first section includes four straight edges and four arc edges, the straight edges are arranged opposite to each other in pairs, the arc edges are respectively connected between two adjacent straight edges, and the distance between two opposite straight edges is greater than or equal to the diameter of the second section.

7. The air guide ring according to claim 2, characterized in that: From the midpoint of the straight edge to the midpoint of the arc edge, the length of the cross-sectional contour line of the transition curved surface along the radial direction of the air duct gradually increases.

8. The air guide ring according to claim 1, characterized in that: The cross section of the second air guiding section perpendicular to the axis of the air duct has a third cross section, and the shape of the third cross section is circular.

9. The air guide ring according to claim 1, characterized in that: A chamfer is formed at a connection position between the first air guiding section and the second air guiding section; Alternatively, at a connection position between the first air guiding segment and the second air guiding segment, a radial cross-sectional contour line of the first air guiding segment along the air duct is arranged tangent to a wall surface of the second air guiding segment.

10. The air guide ring according to claim 1, characterized in that: The main body also includes a third air guide segment, which is connected to the second air guide segment. The air outlet is formed at one end of the third air guide segment away from the second air guide segment, and the inner diameter of the third air guide segment gradually decreases in a direction away from the second air guide segment.

11. A fan, characterized in that: It comprises a wind wheel, a motor and the wind guide ring according to any one of claims 1 to 10, wherein the wind wheel is at least partially located in the wind duct, and the motor is used for driving the wind wheel to rotate.

12. An air conditioner, characterized in that: Including the fan as claimed in claim 11.

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