Air supply fan, air conditioner outdoor unit and air conditioner

Abstract

The present invention provides an air supply fan, an air conditioner outdoor unit and an air conditioner, wherein the air supply fan comprises: a first impeller, the first impeller is provided with a plurality of first blades along the circumferential direction; a second impeller, the second impeller is provided with a plurality of second blades along the circumferential direction, the second impeller is coaxially arranged with the first impeller, and the second impeller rotates in the opposite direction to the first impeller, wherein the chord length of the first blade along the circumferential direction and the chord length of the second blade along the circumferential direction have different changing rules in the radial direction. Through the technical solution of the present invention, the airflow formed by the first impeller and the airflow generated by the second impeller can produce a difference in aerodynamic characteristics, reduce the mutual interference between the first impeller and the second impeller, thereby reducing air pressure fluctuations and reducing noise.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air supply fan, an air conditioning outdoor unit and an air conditioner. Background Art

[0002] At present, the application of counter-rotating fans is becoming more and more common in the field of air conditioning. Since the structures of the front and rear impellers of common counter-rotating fans are the same as the pneumatic loading rules in the radial direction, the airflow is easy to interfere with each other when passing through the two-stage impellers, causing air pressure fluctuations on the air outlet side of the blades and air pressure pulsation in the area between the two-stage impellers, which in turn increases the air supply noise of the fan and affects the comfort of the air conditioner. Summary of the invention

[0003] The present invention aims to improve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, an object of the present invention is to provide an air supply blower.

[0005] Another object of the present invention is to provide an air conditioner outdoor unit.

[0006] Another object of the present invention is to provide an air conditioner.

[0007] In order to achieve the above-mentioned purpose, the first technical solution of the present invention provides an air supply fan, including: a first impeller, the first impeller is provided with a plurality of first blades along the circumferential direction; a second impeller, the second impeller is provided with a plurality of second blades along the circumferential direction, the second impeller is coaxially arranged with the first impeller, and the second impeller rotates in an opposite direction to the first impeller, wherein the chord length of the first blade along the circumferential direction and the chord length of the second blade along the circumferential direction have different change rules in the radial direction.

[0008] According to the technical solution of the first aspect of the present invention, the air supply fan includes a first impeller and a second impeller. Among them, a plurality of first blades are provided on the first impeller along the circumferential direction, so that when the first impeller rotates, the air is stirred by the plurality of first blades to form an airflow. Similarly, a plurality of second blades are provided on the second impeller along the circumferential direction, so that when the second impeller rotates, the air is stirred by the plurality of second impellers to form an airflow. By limiting the first impeller and the second impeller to be coaxially arranged, and the first impeller and the second impeller to rotate in opposite directions, the first impeller and the second impeller form a counter-rotating fan, so that when the air supply fan is running, the airflow movement direction formed by the first impeller is the same as the airflow movement direction formed by the second impeller, thereby realizing combined air supply. By setting the chord length of the first blade along the circumferential direction and the chord length of the second blade along the circumferential direction to have different changing rules in the radial direction, the aerodynamic characteristics of the airflow formed by the second impeller are made different from the aerodynamic characteristics formed by the first impeller, thereby reducing the mutual interference between the second impeller and the first impeller, reducing the air pressure fluctuation in the area between the second impeller and the first impeller, reducing noise, and improving the comfort of use of the air supply fan.

[0009] It should be emphasized that when the air supply fan is running, the direction of air flow movement can be from the first impeller to the second impeller, or from the second impeller to the first impeller.

[0010] In the above technical solution, the chord length of the first blade along the circumferential direction gradually increases from inside to outside along the radial direction of the first impeller, and the chord length of the second blade along the circumferential direction first increases and then decreases from inside to outside along the radial direction of the second impeller.

[0011] In this technical solution, the chord length of the first blade along the circumferential direction is set to gradually increase from the inside to the outside along the radial direction of the first impeller, and the chord length of the second blade along the circumferential direction is first increased and then decreased from the inside to the outside along the radial direction of the second impeller, so that the change law of the first blade in the radial direction is different from the change law of the second blade in the radial direction, thereby reducing the mutual disturbance between the first impeller and the second impeller, reducing the air pressure fluctuation in the area between the first impeller and the second impeller, and reducing the noise when the air supply fan rotates.

[0012] In the above technical scheme, the cross-section of the first blade on multiple concentric circular surfaces with the rotation axis of the air supply fan as the center line is projected into a plane perpendicular to the rotation axis as multiple arc segments, and the chord length of the multiple arc segments corresponding to the first blade gradually increases from the inside to the outside along the radial direction of the first impeller; the cross-section of the second blade on multiple concentric circular surfaces with the rotation axis of the air supply fan as the center line is projected into a plane perpendicular to the rotation axis as multiple arc segments, and the chord length of the multiple arc segments corresponding to the second blade first increases and then decreases from the inside to the outside along the radial direction of the second impeller.

[0013] In this technical solution, multiple concentric circular surfaces are formed with the rotation axis of the air supply fan as the center line, and the first blade forms multiple cross-sections on the multiple concentric circular surfaces, and the projections of the multiple cross-sections in the plane perpendicular to the rotation axis are multiple arc segments. By comparing the size of the chord lengths of the multiple arc segments, the change law of the first blade in the radial direction can be characterized. Similarly, the second blade also forms multiple cross-sections on the multiple concentric circular surfaces, and the projections of the multiple cross-sections in the plane perpendicular to the rotation axis are multiple arc segments. By comparing the size of the chord lengths of the multiple arc segments, the change law of the second blade in the radial direction can be characterized. By limiting the chord lengths of the multiple arc segments corresponding to the first blade to gradually increase from inside to outside along the radial direction of the first impeller, the chord lengths of the multiple arc segments corresponding to the second blade to first increase and then decrease from inside to outside along the radial direction of the second impeller, so that the change law of the first blade in the radial direction is different from the change law of the second blade in the radial direction, thereby reducing the mutual disturbance between the first impeller and the second impeller.

[0014] In the above technical solution, the multiple arc segments corresponding to the second blade include the first arc segment, the second arc segment, the third arc segment, the fourth arc segment and the fifth arc segment in the radial direction, and the chord lengths from the first arc segment to the third arc segment increase in sequence. The chord length of the fourth arc segment is greater than or equal to the chord length of the third arc segment, and the chord length of the fifth arc segment is less than the chord length of the fourth arc segment.

[0015] In this technical solution, the multiple arc segments corresponding to the second blade include the first arc segment, the second arc segment, the third arc segment, the fourth arc segment and the fifth arc segment in the radial direction. By setting the chord lengths of the first arc segment to the third arc segment to increase in sequence, the width of the portion of the second blade close to the end of the rotation axis gradually increases; by setting the chord length of the fourth arc segment to be greater than or equal to the chord length of the third arc segment, the width of the portion of the second blade biased toward the radial outer edge in the middle reaches the maximum, wherein, when the chord length of the fourth arc segment is equal to the chord length of the third arc segment, an equal width area is formed on the second blade, and in the equal width area, the chord lengths of all the arc segments of the second blade are equal and are all the maximum chord lengths. By setting the chord length of the fifth arc segment to be less than the chord length of the fourth arc segment, the width of the outer edge end of the second blade in the radial direction is less than the maximum chord length of the second blade. Through this scheme, the radial change pattern of the second blade can be made different from the radial change pattern of the first blade, especially in the radial outer edge area of ​​the blade. Since the rotation linear speed of the blade in this area is relatively large, the fluctuation of air pressure can easily lead to increased rotation noise. Through this scheme, the air pressure fluctuation between the second impeller and the first impeller can be effectively reduced, especially the air pressure fluctuation in the radial outer edge area of ​​the blade, thereby reducing noise.

[0016] In the above technical solution, the multiple arc segments corresponding to the first blade include the sixth arc segment, the seventh arc segment, the eighth arc segment, the ninth arc segment and the tenth arc segment in the radial direction, and the chord lengths of the sixth arc segment to the tenth arc segment increase in sequence.

[0017] In this technical solution, the multiple arc segments corresponding to the first blade include the sixth arc segment, the seventh arc segment, the eighth arc segment, the ninth arc segment and the tenth arc segment in the radial direction. By setting the chord lengths of the sixth arc segment to the tenth arc segment to increase in sequence, the width of the first blade forms a monotonically increasing change pattern from the inside to the outside along the radial direction. On the one hand, the air volume when the first blade rotates can be increased. On the other hand, the airflow generated by the first impeller can be different from the airflow generated by the second impeller, which is beneficial to reduce the mutual interference between the first impeller and the second impeller and reduce noise.

[0018] In the above technical solution, the cross section corresponding to the fourth arc segment is located in the region of 55% to 85% in the radial direction from inside to outside on the second blade.

[0019] In this technical solution, by setting the cross-section corresponding to the fourth arc segment to be located in the area of ​​55% to 85% in the radial direction from the inside to the outside on the second blade, the position with the largest width on the second blade is located in the partial area in the middle part toward the outer edge along the radial direction. On the one hand, the air volume when the second blade rotates can be increased. On the other hand, since the blade rotation speed in this area is relatively high, the above setting can make the change law of the second blade in this area different from the change law of the area corresponding to the first blade, so as to reduce the air pressure fluctuation of the first impeller and the second impeller in this area during the operation of the air supply fan, which is beneficial to reduce the noise caused by the air pressure fluctuation.

[0020] In the above technical solution, the first impeller is arranged on the air inlet side of the air supply fan, and the second impeller is arranged on the air outlet side of the air supply fan, and the air flow passes through the first impeller and the second impeller in sequence.

[0021] In this technical solution, the first impeller is located on the air inlet side of the air supply fan, and the second impeller is located on the air outlet side of the air supply fan, so that when the air supply fan is running, the air flow passes through the first impeller first and then the second impeller, so that the aerodynamic characteristics formed by the air flow when passing through the first impeller and the second impeller respectively are different, so as to reduce the mutual interference between the first impeller and the second impeller, and reduce the possibility of air pressure fluctuations in the area between the first impeller and the second impeller.

[0022] In the above technical solution, the second impeller is arranged on the air inlet side of the air supply fan, and the first impeller is arranged on the air outlet side of the air supply fan, and the air flow passes through the second impeller and the first impeller in sequence.

[0023] In this technical solution, the second impeller is located on the air inlet side of the air supply fan and the first impeller is located on the air outlet side of the air supply fan, so that when the air supply fan is running, the air flow passes through the second impeller first and then the first impeller, so that the aerodynamic characteristics formed by the air flow when passing through the second impeller and the first impeller respectively are different, so as to reduce the mutual interference between the second impeller and the first impeller, and reduce the possibility of air pressure fluctuations in the area between the second impeller and the first impeller.

[0024] In the above technical solution, the number of the first blades of the first impeller is the same as the number of the second blades of the second impeller, and the first blades and the second blades are arranged correspondingly.

[0025] In this technical solution, the number of first blades of the first impeller is set to be the same as the number of second blades of the second impeller, and the first blades and the second blades are set correspondingly so that the second impeller and the first impeller can be installed. At the same time, the wind resistance of the airflow passing through the air supply fan can be reduced, which is beneficial to the disturbance between the first impeller and the second impeller.

[0026] In the above technical solution, the air supply fan further includes: a motor assembly, which is respectively connected to the first impeller and the second impeller in a transmission manner to drive the first impeller and the second impeller to rotate respectively.

[0027] In this technical solution, a motor assembly is provided, and the motor assembly is respectively connected to the first impeller and the second impeller in a transmission manner, so that the first impeller and the second impeller are driven to rotate by the output power of the motor assembly, thereby realizing the air supply operation of the air supply fan. Furthermore, the motor assembly outputs power to the first impeller and the second impeller respectively, so that the first impeller and the second impeller rotate in opposite directions.

[0028] The second technical solution of the present invention provides an air-conditioning outdoor unit, comprising: a shell; a heat exchanger, arranged in the shell; and an air supply fan as described in any one of the technical solutions of the first aspect, arranged in the shell corresponding to the heat exchanger.

[0029] According to the second technical solution of the present invention, the outdoor unit of the air conditioner includes a housing, a heat exchanger and an air supply fan. By arranging a heat exchanger in the housing, the heat exchanger exchanges heat with the air, so as to achieve the function of regulating the temperature of the outdoor unit of the air conditioner. By arranging an air supply fan in the housing corresponding to the heat exchanger, the air in the housing is accelerated to be discharged outward, which can cool the outdoor unit on the one hand, improve the heat exchange efficiency of the outdoor unit of the air conditioner on the other hand, and reduce the noise of the outdoor unit of the air conditioner during operation by utilizing the different aerodynamic characteristics of the first impeller and the second impeller in the air supply fan. In addition, the outdoor unit of the air conditioner also has all the beneficial effects of the air supply fan in the technical solution of the first aspect of the present invention, which will not be repeated here.

[0030] The third technical solution of the present invention provides an air conditioner, comprising: an indoor unit; an air conditioner outdoor unit such as the air conditioner outdoor unit in the second technical solution, the air conditioner outdoor unit is connected to the indoor unit.

[0031] According to the third aspect of the technical solution of the present invention, the air conditioner includes an indoor unit and an outdoor unit connected to each other, so as to perform heat exchange operation on indoor air through the indoor unit and the outdoor unit to achieve the function of air conditioning. At the same time, the air supply fan in the outdoor unit of the air conditioner can reduce the mutual interference between the first impeller and the second impeller, thereby reducing the air pressure fluctuation between the first impeller and the second impeller, which is conducive to reducing noise. In addition, the air conditioner should also have all the beneficial effects of the outdoor unit of the air conditioner in the second aspect of the technical solution, which will not be repeated here.

[0032] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 A schematic diagram of an air supply fan according to an embodiment of the present invention is shown;

[0035] Figure 2 A schematic diagram of an air supply fan according to an embodiment of the present invention is shown;

[0036] Figure 3 shows a schematic diagram of a second impeller according to an embodiment of the present invention;

[0037] Figure 4 shows a schematic diagram of a second impeller according to an embodiment of the present invention;

[0038] Figure 5 shows a schematic diagram of a first impeller according to an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of an air supply fan according to an embodiment of the present invention is shown;

[0040] Figure 7 A schematic diagram of an air supply fan according to an embodiment of the present invention is shown.

[0041] in, Figures 1 to 7 The corresponding relationship between the reference numerals and components is as follows:

[0042] 1 first impeller, 11 first blade, 2 second impeller, 21 second blade, 31 first arc segment, 32 second arc segment, 33 third arc segment, 34 fourth arc segment, 35 fifth arc segment, 36 sixth arc segment, 37 seventh arc segment, 38 eighth arc segment, 39 ninth arc segment, 30 tenth arc segment, 41 first chord length, 42 second chord length, 43 third chord length, 44 fourth chord length, 45 fifth chord length, 46 sixth chord length, 47 seventh chord length, 48 eighth chord length, 49 ninth chord length, 40 tenth chord length. DETAILED DESCRIPTION

[0043] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0045] Refer to the following Figures 1 to 7 An air supply fan, an air conditioner outdoor unit, and an air conditioner according to some embodiments of the present invention are described.

[0046] Embodiment 1

[0047] This embodiment provides an air supply fan, such as Figure 1 and Figure 2 As shown, it includes a first impeller 1 and a second impeller 2. The first impeller 1 and the second impeller 2 are coaxially arranged, the first impeller 1 is provided with a plurality of first blades 11 arranged along the circumferential direction, the second impeller 2 is provided with a plurality of second blades 21 arranged along the circumferential direction, the second impeller 2 rotates in the opposite direction to the first impeller 1, and the moving direction of the airflow formed when the first impeller 1 rotates is the same as the running direction of the airflow formed when the second impeller 2 rotates, forming a combined air supply. Among them, the chord length of the first blade 11 along the circumferential direction and the chord length of the second blade 21 along the circumferential direction have different change rules in the radial direction. The chord length of the first blade 11 along the circumferential direction gradually increases from the inside to the outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2, so that the aerodynamic characteristics of the airflow formed by the second impeller 2 are different from the aerodynamic characteristics of the airflow formed by the first impeller 1, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing air pressure fluctuations, and reducing the noise generated during the operation of the air supply fan.

[0048] Embodiment 2

[0049] This embodiment provides an air supply fan, such as Figure 1 and Figure 2 As shown, it includes a first impeller 1, a second impeller 2 and a motor assembly. The first impeller 1 is coaxially arranged with the second impeller 2. The first impeller 1 is provided with a plurality of first blades 11 arranged in the circumferential direction, and the second impeller 2 is provided with a plurality of second blades 21 arranged in the circumferential direction. The second impeller 2 rotates in the opposite direction to the first impeller 1. The first impeller 1 is arranged on the air inlet side of the air supply fan, and the second impeller 2 is arranged on the air outlet side of the air supply fan. The movement direction of the airflow formed when the first impeller 1 rotates is the same as the running direction of the airflow formed when the second impeller 2 rotates, thereby forming a combined air supply, and the airflow passes through the first impeller 1 and the second impeller 2 in sequence and is sent out. The motor assembly is respectively connected to the first impeller 1 and the second impeller 2 in transmission to drive the first impeller 1 and the second impeller 2 to rotate. Among them, the chord length of the first blade 11 along the circumferential direction and the chord length of the second blade 21 along the circumferential direction have different change rules in the radial direction. The chord length of the first blade 11 along the circumferential direction gradually increases from the inside to the outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2.

[0050] Specifically, Figure 3As shown, five concentric circles are made with the rotation axis of the second impeller 2 as the center line, and the second blade 21 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the second impeller 2 form five arc segments, which are respectively the first arc segment 31, the second arc segment 32, the third arc segment 33, the fourth arc segment 34 and the fifth arc segment 35 from inside to outside in the radial direction of the second blade 21. The first arc segment 31 is located at the inner edge of the second blade 21 in the radial direction, and the fifth arc segment 35 is located at the outer edge of the second blade 21 in the radial direction. The chord lengths between the two endpoints of each arc segment are respectively the first chord length 41, the second chord length 42, the third chord length 43, the fourth chord length 44 and the fifth chord length 45. Among them, the lengths from the first chord length 41 to the fourth chord length 44 gradually increase, and the length of the fifth chord length 45 is less than the length of the fourth chord length 44, so that the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2, and the cross section corresponding to the fourth arc segment 34 is located in the area of ​​55% to 85% from the inside to the outside along the radial direction of the second blade 21. Through the above settings, on the one hand, the air volume of the second impeller 2 can be increased, and on the other hand, the aerodynamic characteristics of the airflow formed by the second impeller 2 can be different from the aerodynamic characteristics of the airflow formed by the first impeller 1. In particular, the aerodynamic characteristics of the airflow in the area of ​​the second blade 21 with a larger rotational linear velocity can be effectively changed, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing air pressure fluctuations, and reducing the noise generated when the air supply fan is running. Optionally, the cross-section corresponding to the fourth arc segment 34 is located within a region of 58% to 82% in the radial direction from the inside to the outside on the second blade 21. Further, the cross-section corresponding to the fourth arc segment 34 is located within a region of 60% to 80% in the radial direction from the inside to the outside on the second blade 21.

[0051] Furthermore, the number of the first blades 11 of the first impeller 1 is the same as the number of the second blades 21 of the second impeller 2 , and the first blades 11 and the second blades 21 are arranged correspondingly.

[0052] Embodiment 3

[0053] This embodiment provides an air supply fan, such as Figure 1 and Figure 2As shown, it includes a first impeller 1, a second impeller 2 and a motor assembly. The first impeller 1 is coaxially arranged with the second impeller 2. The first impeller 1 is provided with a plurality of first blades 11 arranged in the circumferential direction, and the second impeller 2 is provided with a plurality of second blades 21 arranged in the circumferential direction. The second impeller 2 rotates in the opposite direction to the first impeller 1. The first impeller 1 is arranged on the air inlet side of the air supply fan, and the second impeller 2 is arranged on the air outlet side of the air supply fan. The movement direction of the airflow formed when the first impeller 1 rotates is the same as the running direction of the airflow formed when the second impeller 2 rotates, thereby forming a combined air supply, and the airflow passes through the first impeller 1 and the second impeller 2 in sequence and is sent out. The motor assembly is respectively connected to the first impeller 1 and the second impeller 2 in transmission to drive the first impeller 1 and the second impeller 2 to rotate. Among them, the chord length of the first blade 11 along the circumferential direction and the chord length of the second blade 21 along the circumferential direction have different change rules in the radial direction. The chord length of the first blade 11 along the circumferential direction gradually increases from the inside to the outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2.

[0054] Specifically, Figure 4As shown, five concentric circles are made with the rotation axis of the second impeller 2 as the center line, and the second blade 21 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the second impeller 2 form five arc segments, which are respectively the first arc segment 31, the second arc segment 32, the third arc segment 33, the fourth arc segment 34 and the fifth arc segment 35 from inside to outside in the radial direction of the second blade 21. The first arc segment 31 is located at the inner edge of the second blade 21 in the radial direction, and the fifth arc segment 35 is located at the outer edge of the second blade 21 in the radial direction. The chord lengths between the two endpoints of each arc segment are respectively the first chord length 41, the second chord length 42, the third chord length 43, the fourth chord length 44 and the fifth chord length 45. Among them, the lengths from the first chord length 41 to the third chord length 43 gradually increase, the length of the fourth chord length 44 is the same as the length of the third chord length 43, and the length of the fifth chord length 45 is less than the length of the fourth chord length 44, so that the chord length of the second blade 21 along the circumferential direction increases first and then decreases from the inside to the outside along the radial direction of the second impeller 2, and the cross section corresponding to the fourth arc segment 34 is located in the area of ​​55% to 85% from the inside to the outside of the second blade 21 along the radial direction, and at the same time, an equal width area is formed in the area from the third chord length 43 to the fourth chord length 44. Through the above arrangement, on the one hand, the air volume of the second impeller 2 can be increased, and on the other hand, the aerodynamic characteristics of the airflow formed by the second impeller 2 can be different from the aerodynamic characteristics of the airflow formed by the first impeller 1. In particular, the aerodynamic characteristics of the airflow in the area where the rotational linear velocity of the second blade 21 is relatively large can be effectively changed, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing the air pressure fluctuation, and reducing the noise generated when the air supply fan is running. Optionally, the cross-section corresponding to the fourth arc segment 34 is located within a region of 58% to 82% in the radial direction from the inside to the outside on the second blade 21. Further, the cross-section corresponding to the fourth arc segment 34 is located within a region of 60% to 80% in the radial direction from the inside to the outside on the second blade 21.

[0055] Furthermore, the number of the first blades 11 of the first impeller 1 is the same as the number of the second blades 21 of the second impeller 2 , and the first blades 11 and the second blades 21 are arranged correspondingly.

[0056] Embodiment 4

[0057] This embodiment provides an air supply fan, such as Figure 1 and Figure 2As shown, it includes a first impeller 1, a second impeller 2 and a motor assembly. The first impeller 1 is coaxially arranged with the second impeller 2. The first impeller 1 is provided with a plurality of first blades 11 arranged in the circumferential direction, and the second impeller 2 is provided with a plurality of second blades 21 arranged in the circumferential direction. The second impeller 2 rotates in the opposite direction to the first impeller 1. The first impeller 1 is arranged on the air inlet side of the air supply fan, and the second impeller 2 is arranged on the air outlet side of the air supply fan. The movement direction of the airflow formed when the first impeller 1 rotates is the same as the running direction of the airflow formed when the second impeller 2 rotates, thereby forming a combined air supply, and the airflow passes through the first impeller 1 and the second impeller 2 in sequence and is sent out. The motor assembly is respectively connected to the first impeller 1 and the second impeller 2 in transmission to drive the first impeller 1 and the second impeller 2 to rotate. Among them, the chord length of the first blade 11 along the circumferential direction and the chord length of the second blade 21 along the circumferential direction have different change rules in the radial direction. The chord length of the first blade 11 along the circumferential direction gradually increases from the inside to the outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2.

[0058] Specifically, Figure 5 As shown, five concentric circles are made with the rotation axis of the first impeller 1 as the center line, and the first blade 11 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the first impeller 1 form five arc segments, which are the sixth arc segment 36, the seventh arc segment 37, the eighth arc segment 38, the ninth arc segment 39 and the tenth arc segment 30 from inside to outside in the radial direction of the first blade 11, respectively. The sixth arc segment 36 is located at the inner edge of the first blade 11 in the radial direction, and the tenth arc segment 30 is located at the outer edge of the first blade 11 in the radial direction. The chord lengths between the two end points of each arc segment are the sixth chord length 46, the seventh chord length 47, the eighth chord length 48, the ninth chord length 49 and the tenth chord length 40. Among them, the lengths of the sixth chord length 46 to the tenth chord length 40 gradually increase from inside to outside in the radial direction, so that the chord length of the first blade 11 in the circumferential direction gradually increases from inside to outside in the radial direction of the first impeller 1. Through the above arrangement, on the one hand, the air volume of the first impeller 1 can be increased, and on the other hand, the aerodynamic characteristics of the airflow formed by the first impeller 1 can be made different from the aerodynamic characteristics of the airflow formed by the second impeller 2. In particular, the aerodynamic characteristics of the airflow in the area where the linear rotation speed of the first blade 11 is relatively large can be effectively changed, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing air pressure fluctuations, and reducing the noise generated during the operation of the air supply fan.

[0059] Furthermore, the number of the first blades 11 of the first impeller 1 is the same as the number of the second blades 21 of the second impeller 2 , and the first blades 11 and the second blades 21 are arranged correspondingly.

[0060] Embodiment 5

[0061] This embodiment provides an air supply fan, such as Figure 1 and Figure 2 As shown, it includes a first impeller 1, a second impeller 2 and a motor assembly. The first impeller 1 is coaxially arranged with the second impeller 2. The first impeller 1 is provided with a plurality of first blades 11 arranged in the circumferential direction, and the second impeller 2 is provided with a plurality of second blades 21 arranged in the circumferential direction. The second impeller 2 rotates in the opposite direction to the first impeller 1. The first impeller 1 is arranged on the air inlet side of the air supply fan, and the second impeller 2 is arranged on the air outlet side of the air supply fan. The movement direction of the airflow formed when the first impeller 1 rotates is the same as the running direction of the airflow formed when the second impeller 2 rotates, thereby forming a combined air supply, and the airflow passes through the first impeller 1 and the second impeller 2 in sequence and is sent out. The motor assembly is respectively connected to the first impeller 1 and the second impeller 2 in transmission to drive the first impeller 1 and the second impeller 2 to rotate. Among them, the chord length of the first blade 11 along the circumferential direction and the chord length of the second blade 21 along the circumferential direction have different change rules in the radial direction. The chord length of the first blade 11 along the circumferential direction gradually increases from the inside to the outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2.

[0062] Specifically, Figure 3 As shown, five concentric circles are made with the rotation axis of the second impeller 2 as the center line, and the second blade 21 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the second impeller 2 form five arc segments, which are respectively the first arc segment 31, the second arc segment 32, the third arc segment 33, the fourth arc segment 34 and the fifth arc segment 35 from inside to outside in the radial direction of the second blade 21. The first arc segment 31 is located at the inner edge of the second blade 21 in the radial direction, and the fifth arc segment 35 is located at the outer edge of the second blade 21 in the radial direction. The chord lengths between the two endpoints of each arc segment are respectively the first chord length 41, the second chord length 42, the third chord length 43, the fourth chord length 44 and the fifth chord length 45. Among them, the lengths of the first chord length 41 to the fourth chord length 44 gradually increase, and the length of the fifth chord length 45 is smaller than the length of the fourth chord length 44, so that the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2, and the cross-section corresponding to the fourth arc segment 34 is located in the area of ​​60% to 80% in the radial direction from the inside to the outside on the second blade 21.

[0063] like Figure 5As shown, five concentric circles are made with the rotation axis of the first impeller 1 as the center line, and the first blade 11 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the first impeller 1 form five arc segments, which are the sixth arc segment 36, the seventh arc segment 37, the eighth arc segment 38, the ninth arc segment 39 and the tenth arc segment 30 from inside to outside in the radial direction of the first blade 11, respectively. The sixth arc segment 36 is located at the inner edge of the first blade 11 in the radial direction, and the tenth arc segment 30 is located at the outer edge of the first blade 11 in the radial direction. The chord lengths between the two end points of each arc segment are the sixth chord length 46, the seventh chord length 47, the eighth chord length 48, the ninth chord length 49 and the tenth chord length 40. Among them, the lengths of the sixth chord length 46 to the tenth chord length 40 gradually increase from inside to outside in the radial direction, so that the chord length of the first blade 11 in the circumferential direction gradually increases from inside to outside in the radial direction of the first impeller 1. Through the above arrangement, on the one hand, the air volume of the first impeller 1 can be increased, and on the other hand, the aerodynamic characteristics of the airflow formed by the first impeller 1 can be made different from the aerodynamic characteristics of the airflow formed by the second impeller 2. In particular, the aerodynamic characteristics of the airflow in the area where the linear rotation speed of the first blade 11 is relatively large can be effectively changed, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing air pressure fluctuations, and reducing the noise generated during the operation of the air supply fan.

[0064] Furthermore, the number of the first blades 11 of the first impeller 1 is the same as the number of the second blades 21 of the second impeller 2 , and the first blades 11 and the second blades 21 are arranged correspondingly.

[0065] It should be noted that the length of the fourth chord length 44 may be the same as the length of the third chord length 43 . In this case, an equal-width region is formed in the region from the third chord length 43 to the fourth chord length 44 on the second blade 21 .

[0066] Embodiment 6

[0067] This embodiment provides an air supply fan, such as Figure 6 and Figure 7As shown, it includes a first impeller 1, a second impeller 2 and a motor assembly. The first impeller 1 is coaxially arranged with the second impeller 2. The first impeller 1 is provided with a plurality of first blades 11 arranged in the circumferential direction, and the second impeller 2 is provided with a plurality of second blades 21 arranged in the circumferential direction. The second impeller 2 rotates in the opposite direction to the first impeller 1. The second impeller 2 is arranged on the air inlet side of the air supply fan, and the first impeller 1 is arranged on the air outlet side of the air supply fan. The movement direction of the airflow formed when the second impeller 2 rotates is the same as the running direction of the airflow formed when the first impeller 1 rotates, thereby forming a combined air supply, and the airflow passes through the second impeller 2 and the first impeller 1 in sequence and is sent out. The motor assembly is respectively connected to the first impeller 1 and the second impeller 2 in transmission to drive the first impeller 1 and the second impeller 2 to rotate. Among them, the chord length of the first blade 11 along the circumferential direction and the chord length of the second blade 21 along the circumferential direction have different change rules in the radial direction. The chord length of the first blade 11 along the circumferential direction gradually increases from the inside to the outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2.

[0068] Specifically, Figure 3 As shown, five concentric circles are made with the rotation axis of the second impeller 2 as the center line, and the second blade 21 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the second impeller 2 form five arc segments, which are respectively the first arc segment 31, the second arc segment 32, the third arc segment 33, the fourth arc segment 34 and the fifth arc segment 35 from inside to outside in the radial direction of the second blade 21. The first arc segment 31 is located at the inner edge of the second blade 21 in the radial direction, and the fifth arc segment 35 is located at the outer edge of the second blade 21 in the radial direction. The chord lengths between the two endpoints of each arc segment are respectively the first chord length 41, the second chord length 42, the third chord length 43, the fourth chord length 44 and the fifth chord length 45. Among them, the lengths of the first chord length 41 to the fourth chord length 44 gradually increase, and the length of the fifth chord length 45 is smaller than the length of the fourth chord length 44, so that the chord length of the second blade 21 along the circumferential direction first increases and then decreases from the inside to the outside along the radial direction of the second impeller 2, and the cross-section corresponding to the fourth arc segment 34 is located in the area of ​​60% to 80% in the radial direction from the inside to the outside on the second blade 21.

[0069] like Figure 5As shown, five concentric circles are made with the rotation axis of the first impeller 1 as the center line, and the first blade 11 forms five cross sections on the five concentric circles. The projections of the five cross sections on the plane perpendicular to the rotation axis of the first impeller 1 form five arc segments, which are the sixth arc segment 36, the seventh arc segment 37, the eighth arc segment 38, the ninth arc segment 39 and the tenth arc segment 30 from inside to outside in the radial direction of the first blade 11, respectively. The sixth arc segment 36 is located at the inner edge of the first blade 11 in the radial direction, and the tenth arc segment 30 is located at the outer edge of the first blade 11 in the radial direction. The chord lengths between the two end points of each arc segment are the sixth chord length 46, the seventh chord length 47, the eighth chord length 48, the ninth chord length 49 and the tenth chord length 40. Among them, the lengths of the sixth chord length 46 to the tenth chord length 40 gradually increase from inside to outside in the radial direction, so that the chord length of the first blade 11 in the circumferential direction gradually increases from inside to outside in the radial direction of the first impeller 1. Through the above arrangement, on the one hand, the air volume of the first impeller 1 can be increased, and on the other hand, the aerodynamic characteristics of the airflow formed by the first impeller 1 can be made different from the aerodynamic characteristics of the airflow formed by the second impeller 2. In particular, the aerodynamic characteristics of the airflow in the area where the linear rotation speed of the first blade 11 is relatively large can be effectively changed, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing air pressure fluctuations, and reducing the noise generated during the operation of the air supply fan.

[0070] Furthermore, the number of the first blades 11 of the first impeller 1 is the same as the number of the second blades 21 of the second impeller 2 , and the first blades 11 and the second blades 21 are arranged correspondingly.

[0071] It should be noted that the length of the fourth chord length 44 may be the same as the length of the third chord length 43 . In this case, an equal-width region is formed in the region from the third chord length 43 to the fourth chord length 44 on the second blade 21 .

[0072] Embodiment 7

[0073] In the present embodiment, an air-conditioning outdoor unit is provided, comprising a housing, a heat exchanger, and an air supply fan of any one of the above-mentioned embodiments 1 to 6. The heat exchanger and the air supply fan are both arranged in the housing, and the air supply fan and the heat exchanger are arranged correspondingly, so that when the air-conditioning outdoor unit is in operation, the air flow in the housing is accelerated by the operation of the air supply fan, the heat exchange efficiency of the heat exchanger is improved, and the heat dissipation of the air-conditioning outdoor unit is promoted. Through the first impeller 1 and the second impeller 2 in the air supply fan, a heat dissipation grille or heat dissipation hole is provided on the housing, so that the air flow can be discharged to the outside of the housing through the heat dissipation grille or the heat dissipation hole. The air-conditioning outdoor unit in the present embodiment also has all the beneficial effects of the air supply fan of any one of the above-mentioned embodiments 1 to 6, which will not be repeated here.

[0074] Embodiment 8

[0075] In this embodiment, an air conditioner is provided, comprising an indoor unit and an outdoor unit of the air conditioner in the seventh embodiment above, wherein the indoor unit is connected to the outdoor unit of the air conditioner to achieve indoor air conditioning through the circulation of refrigerant between the indoor unit and the outdoor unit of the air conditioner. At the same time, the air supply fan in the outdoor unit of the air conditioner can reduce the mutual interference between the first impeller 1 and the second impeller 2, thereby reducing the air pressure fluctuation between the first impeller 1 and the second impeller 2, which is conducive to reducing noise. The air conditioner in this embodiment should also have all the beneficial effects of the outdoor unit of the air conditioner in the seventh embodiment above, which will not be repeated here.

[0076] The above technical solution of the present invention is described in detail in combination with the accompanying drawings. By changing the structure of the first blade and the second blade in the air supply fan, the airflow formed by the first impeller and the airflow generated by the second impeller produce a difference in aerodynamic characteristics, thereby reducing the mutual interference between the first impeller and the second impeller, thereby reducing air pressure fluctuations and reducing the noise during the operation of the air supply fan.

[0077] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying 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 unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0079] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air supply fan, characterized in that: include: A first impeller, wherein the first impeller is provided with a plurality of first blades along a circumferential direction; a second impeller, wherein the second impeller is provided with a plurality of second blades along a circumferential direction, the second impeller is coaxially arranged with the first impeller, and the second impeller rotates in the opposite direction to the first impeller, The chord length of the first blade along the circumferential direction and the chord length of the second blade along the circumferential direction have different changing rules in the radial direction; The chord length of the first blade along the circumferential direction gradually increases from inside to outside along the radial direction of the first impeller, and the chord length of the second blade along the circumferential direction first increases and then decreases from inside to outside along the radial direction of the second impeller; The cross-sections of the first blade on multiple concentric circular surfaces with the rotation axis of the air supply fan as the center line are projected into multiple arc segments in a plane perpendicular to the rotation axis, and the chord lengths of the multiple arc segments corresponding to the first blade gradually increase from inside to outside along the radial direction of the first impeller; The cross-sections of the second blade on multiple concentric circular surfaces with the rotation axis of the air supply fan as the center line are projected into a plurality of arc segments in a plane perpendicular to the rotation axis, and the chord lengths of the plurality of arc segments corresponding to the second blade first increase and then decrease from inside to outside along the radial direction of the second impeller; The plurality of arc segments corresponding to the second blade include a first arc segment, a second arc segment, a third arc segment, a fourth arc segment and a fifth arc segment in sequence along the radial direction, the chord lengths from the first arc segment to the third arc segment increase in sequence, the chord length of the fourth arc segment is equal to the chord length of the third arc segment, and the chord length of the fifth arc segment is less than the chord length of the fourth arc segment; The chord lengths between the two end points of each arc segment are respectively a first chord length, a second chord length, a third chord length, a fourth chord length and a fifth chord length, and an equal-width area is formed in the area from the third chord length to the fourth chord length, and in the equal-width area, the chord lengths of all the arc segments of the second blade are equal; The cross section corresponding to the fourth arc segment is located in the region of 55% to 85% in the radial direction from inside to outside on the second blade.

2. The air supply fan according to claim 1, characterized in that: The multiple arc segments corresponding to the first blade include a sixth arc segment, a seventh arc segment, an eighth arc segment, a ninth arc segment and a tenth arc segment in sequence along the radial direction, and the chord lengths of the sixth arc segment to the tenth arc segment increase in sequence.

3. The air supply fan according to claim 1, characterized in that: The first impeller is arranged at the air inlet side of the air supply fan, and the second impeller is arranged at the air outlet side of the air supply fan, and the air flow passes through the first impeller and the second impeller in sequence.

4. The air supply fan according to claim 1, characterized in that: The second impeller is arranged at the air inlet side of the air supply fan, and the first impeller is arranged at the air outlet side of the air supply fan, and the air flow passes through the second impeller and the first impeller in sequence.

5. The air supply fan according to claim 1, characterized in that: The number of the first blades of the first impeller is the same as the number of the second blades of the second impeller, and the first blades are arranged correspondingly to the second blades.

6. The air supply fan according to any one of claims 1 to 5, characterized in that: Also includes: A motor assembly is respectively connected to the first impeller and the second impeller in a transmission manner to respectively drive the first impeller and the second impeller to rotate.

7. An air conditioner outdoor unit, characterized in that: include: case; A heat exchanger is disposed in the shell; The air supply fan according to any one of claims 1 to 6 is arranged in the casing corresponding to the heat exchanger.

8. An air conditioner, characterized in that: include: Indoor unit; The air conditioner outdoor unit according to claim 7, wherein the air conditioner outdoor unit is connected to the indoor unit.

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