CN210861436U

CN210861436U - Air supply fan, air conditioner outdoor unit and air conditioner

Info

Publication number: CN210861436U
Application number: CN201922102904.6U
Authority: CN
Inventors: 蔡序杰
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-06-26
Anticipated expiration: 2029-11-29

Abstract

The utility model provides an air supply fan, air condensing units and air conditioner, wherein, air supply fan includes: the first impeller is provided with a plurality of first blades along the circumferential direction; 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, the rotating direction of the second impeller is opposite to that of the first impeller, and the change rule of the chord length of the first blade along the circumferential direction and the chord length of the second blade along the circumferential direction in the radial direction are different. Through the technical scheme of the utility model, can make the produced air current of the air current that first impeller formed and second impeller produce the aerodynamic characteristic difference, reduce the mutual interference between first impeller and the second impeller to it is undulant, the noise reduction to reduce atmospheric pressure.

Description

Air supply fan, air conditioner outdoor unit and air conditioner

Technical Field

The utility model relates to an air conditioning technology field particularly, relates to an air supply fan, an air condensing units and an air conditioner.

Background

At present, the application of the cyclone fan is increasingly common in the field of air conditioners. Common counter-rotating fan is because the structure of front and back two-stage impeller and the pneumatic loading law in radial direction are the same, and the air current forms mutual interference when passing two-stage impeller between the two-stage impeller easily, causes the atmospheric pressure fluctuation of the air-out side of blade to regional production atmospheric pressure pulsation between two-stage impeller, and then leads to the air supply noise increase of fan, influences the use travelling comfort of air conditioner.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to at least one of the problems of the prior art or the related art.

Therefore, an object of the utility model is to provide an air supply fan.

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

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

In order to achieve the above object, the first aspect of the present invention provides an air supply fan, including: the first impeller is provided with a plurality of first blades along the circumferential direction; 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, the rotating direction of the second impeller is opposite to that of the first impeller, and the change rule of the chord length of the first blade along the circumferential direction and the chord length of the second blade along the circumferential direction in the radial direction are different.

According to the utility model discloses first aspect technical scheme, air supply fan includes first impeller and second impeller. The first impeller is provided with a plurality of first blades along the circumferential direction, so that when the first impeller rotates, air is stirred by the first blades to form airflow. Similarly, a plurality of second blades are provided on the second impeller in a circumferential direction to agitate air by the plurality of second blades to form an air flow when the second impeller rotates. Through injecing first impeller and the coaxial setting of second impeller, and first impeller and second impeller rotation opposite direction for first impeller and second impeller form the antithrust fan, and when air supply fan operates, the air current direction of motion that first impeller formed is the same with the air current direction of motion that the second impeller formed, realize the combination air supply. The change rule of the chord length of the first blade in the circumferential direction and the change rule of the chord length of the second blade in the circumferential direction in the radial direction are different, so that the pneumatic characteristic of the airflow formed by the second impeller and the pneumatic characteristic formed by the first impeller are different, the mutual interference between the second impeller and the first impeller is reduced, the air pressure fluctuation in the area between the second impeller and the first impeller is reduced, the noise is reduced, and the use comfort of the air supply fan is improved.

It should be emphasized that, when the blower fan is operated, the direction of the airflow movement may be from the first impeller to the second impeller, or from the second impeller to the first impeller.

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 increases first and then decreases along the radial direction of the second impeller from inside to outside.

In this technical scheme, through setting up the radial from inside to outside crescent along first impeller of first blade along the chord length of circumferencial direction, the second blade reduces along the first increase back of radial from inside to outside of second impeller along the chord length of circumferencial direction, thereby make first blade form the difference at the change law of radial direction and second blade at the change law of radial direction, and then reduce the mutual disturbance between first impeller and the second impeller, reduce the atmospheric pressure fluctuation in the region between first impeller and the second impeller, noise when reducing air supply fan and rotating.

In the technical scheme, the projections of the sections of the first blades on a plurality of concentric circular surfaces with the rotation axis of the air supply fan as the central line in a plane perpendicular to the rotation axis are a plurality of arc line segments, and the chord lengths of the plurality of arc line segments corresponding to the first blades are gradually increased from inside to outside along the radial direction of the first impeller; the cross sections of the second blades on a plurality of concentric circular surfaces taking the rotation axis of the air supply fan as the central line are projected into a plane perpendicular to the rotation axis to form a plurality of arc line sections, and the chord lengths of the plurality of arc line sections corresponding to the second blades are increased from inside to outside and then reduced along the radial direction of the second impeller.

In the technical scheme, a plurality of concentric circular surfaces are formed by taking the rotating axis of the air supply fan as a central line, a plurality of sections are formed on the first blade on the plurality of concentric circular surfaces, the projections of the plurality of sections in a plane perpendicular to the rotating axis are a plurality of arc line sections, and the change rule of the first blade in the radial direction can be represented by comparing the size of the chord length of the plurality of arc line sections. Similarly, the second blade is also provided with a plurality of sections on a plurality of concentric circular surfaces, the projections of the plurality of sections in a plane perpendicular to the rotation axis are a plurality of arc line sections, and the change rule of the second blade in the radial direction can be represented by comparing the sizes of the chord lengths of the plurality of arc line sections. The chord lengths of the arc line sections corresponding to the first blade are gradually increased from inside to outside along the radial direction of the first impeller, the chord lengths of the arc line sections corresponding to the second blade are increased from inside to outside and then are reduced along the radial direction of the second impeller, so that the change rule of the first blade in the radial direction and the change rule of the second blade in the radial direction form differences, and further mutual disturbance between the first impeller and the second impeller is reduced.

In the above technical solution, the plurality of arc segments corresponding to the second blade sequentially include a first arc segment, a second arc segment, a third arc segment, a fourth arc segment and a fifth arc segment in the radial direction, the chord lengths from the first arc segment to the third arc segment are sequentially increased, 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 smaller than the chord length of the fourth arc segment.

In the technical scheme, a plurality of arc line sections corresponding to the second blade sequentially comprise a first arc line section, a second arc line section, a third arc line section, a fourth arc line section and a fifth arc line section along the radial direction, and the chord lengths from the first arc line section to the third arc line section are sequentially increased, so that the width of the part of one end, close to the rotation axis, of the second blade is gradually increased; the chord length of the fourth arc line segment is larger than or equal to that of the third arc line segment, so that the width of the part, which is deviated to the radial outer edge, of the middle part of the second blade is maximized, wherein when the chord length of the fourth arc line segment is equal to that of the third arc line segment, a section of equal-width area is formed on the second blade, and in the equal-width area, the chord lengths of all arc line segments of the second blade are equal and are the maximum chord length. And the chord length of the fifth arc line segment is smaller than that of the fourth arc line segment, so that the width of the outer edge end of the second blade in the radial direction is smaller than the maximum chord length of the second blade. According to the scheme, the radial change rule of the second blade and the radial change rule of the first blade can form difference, particularly in the region of the radial outer edge part of the blade, the rotation linear speed of the blade in the region is high, and the rotation noise is increased easily due to the fluctuation of the air pressure.

In the above technical solution, the plurality of arc segments corresponding to the first blade sequentially include a sixth arc segment, a seventh arc segment, an eighth arc segment, a ninth arc segment and a tenth arc segment in the radial direction, and the chord lengths from the sixth arc segment to the tenth arc segment are sequentially increased.

According to the technical scheme, the plurality of arc segments corresponding to the first blade sequentially comprise a sixth arc segment, a seventh arc segment, an eighth arc segment, a ninth arc segment and a tenth arc segment along the radial direction, and the chord lengths from the sixth arc segment to the tenth arc segment are sequentially increased, so that the width of the first blade forms a monotone increasing change rule along the radial direction from inside to outside, on one hand, the air volume of the first blade during rotation can be increased, on the other hand, the air flow generated by the first impeller is different from the air flow generated by the second impeller, the mutual interference between the first impeller and the second impeller is favorably reduced, and the noise is reduced.

In the above technical solution, the cross section corresponding to the fourth arc line segment is located in an area of 55% to 85% of the second blade in the radial direction from inside to outside.

In the technical scheme, the section corresponding to the fourth arc line segment is arranged in an area which is 55-85% of the second blade in the radial direction from inside to outside, so that the position with the largest width of the second blade is arranged in a partial area which is deviated from the outer edge in the radial middle part, on one hand, the air volume of the second blade during rotation can be increased, on the other hand, due to the fact that the rotating speed of the blade in the area is high, the change rule of the second blade in the area can form difference with the change rule of the area corresponding to the first blade through the arrangement, and in the operation process of the air supply fan, the air pressure fluctuation of the first impeller and the air pressure fluctuation of the second impeller in the area are reduced, and the noise generated by the air pressure fluctuation is reduced.

In the technical scheme, the first impeller is arranged on the air inlet side of the air supply fan, the second impeller is arranged on the air outlet side of the air supply fan, and the air flow sequentially passes through the first impeller and the second impeller.

In the technical scheme, the first impeller is arranged on the air inlet side of the air supply fan, the second impeller is arranged on the air outlet side of the air supply fan, so that when the air supply fan operates, air flow firstly passes through the first impeller and then passes through the second impeller, the pneumatic characteristics of the air flow formed when the air flow respectively passes through the first impeller and the second impeller are different, the mutual interference between the first impeller and the second impeller is reduced, and the possibility of air pressure fluctuation in an area between the first impeller and the second impeller is reduced.

In the technical scheme, the second impeller is arranged on the air inlet side of the air supply fan, the first impeller is arranged on the air outlet side of the air supply fan, and the airflow sequentially passes through the second impeller and the first impeller.

In the technical scheme, the second impeller is arranged on the air inlet side of the air supply fan, the first impeller is arranged on the air outlet side of the air supply fan, so that when the air supply fan runs, airflow firstly passes through the second impeller and then passes through the first impeller, the aerodynamic characteristics of the airflow formed when the airflow respectively passes through the second impeller and the first impeller are different, the mutual interference between the second impeller and the first impeller is reduced, and the possibility of forming air pressure fluctuation in the area between the second impeller and the first impeller is reduced.

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 correspondingly arranged.

In the technical scheme, the number of the first blades of the first impeller is equal to that of the second blades of the second impeller, and the first blades and the second blades are correspondingly arranged, so that the second impeller and the first impeller are used for installation, and meanwhile, the wind resistance of airflow when passing through the air supply fan can be reduced, and the disturbance between the first impeller and the second impeller is facilitated.

In the above technical solution, the air supply fan further includes: and the motor assembly is in transmission connection with the first impeller and the second impeller respectively so as to drive the first impeller and the second impeller to rotate respectively.

In the technical scheme, the motor assembly is arranged and is respectively in transmission connection with the first impeller and the second impeller, so that the first impeller and the second impeller are driven to rotate by the output power of the motor assembly, and the air supply operation of the air supply fan is realized. Further, 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.

The utility model discloses a second aspect technical scheme provides an air condensing units, include: a housing; the heat exchanger is arranged in the shell; as mentioned in any one of the above first aspect technical solutions, the air supply fan is disposed in the casing corresponding to the heat exchanger.

According to the utility model discloses a second aspect technical scheme, air condensing units includes casing, heat exchanger and air supply fan. The heat exchanger is arranged in the shell, so that heat exchange between the heat exchanger and air is realized, and the temperature adjusting effect of the outdoor unit of the air conditioner is realized. Through the air supply fan that corresponds the setting with the heat exchanger in the casing to outwards discharge the air in the casing with higher speed, can cool down the off-premises station on the one hand, on the other hand can improve air condensing units's heat exchange efficiency, still can utilize the different aerodynamic characteristics of first impeller and second impeller in the air supply fan, noise when reducing air condensing units operation. Furthermore, air condensing units still has the utility model discloses the whole beneficial effect of air supply fan among the technical scheme of the first aspect, no longer give unnecessary details here.

The utility model discloses an among the third aspect technical scheme provide an air conditioner, include: an indoor unit; like the outdoor unit of an air conditioner in the technical solution of the second aspect, the outdoor unit of an air conditioner is connected with the indoor unit.

According to the third aspect of the present invention, the air conditioner includes an indoor unit and an outdoor unit connected to each other, so as to perform a heat exchange operation on indoor air through the indoor unit and the outdoor unit, thereby achieving an air conditioning effect. Meanwhile, the air supply fan in the air conditioner outdoor unit can reduce the mutual interference between the first impeller and the second impeller, so that the air pressure fluctuation between the first impeller and the second impeller is reduced, and the noise reduction is facilitated. In addition, the air conditioner should have all the advantages of the outdoor unit of the air conditioner in the above technical solution of the second aspect, which are not described herein again.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic view of an air supply fan according to an embodiment of the present invention;

fig. 2 shows a schematic view of an air supply fan according to an embodiment of the present invention;

fig. 3 shows a schematic view of a second impeller according to an embodiment of the invention;

fig. 4 shows a schematic view of a second impeller according to an embodiment of the invention;

fig. 5 shows a schematic view of a first impeller according to an embodiment of the invention;

fig. 6 shows a schematic view of an air supply fan according to an embodiment of the present invention;

fig. 7 shows a schematic view of an air supply fan according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the components in fig. 1 to 7 is as follows:

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

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An air supply fan, an outdoor unit of an air conditioner, and an air conditioner according to some embodiments of the present invention will be described below with reference to fig. 1 to 7.

Example one

The present embodiment provides a blower fan, as shown in fig. 1 and 2, including a first impeller 1 and a second impeller 2. The first impeller 1 and the second impeller 2 are coaxially arranged, a plurality of first blades 11 arranged along the circumferential direction are arranged on the first impeller 1, a plurality of second blades 21 arranged along the circumferential direction are arranged on the second impeller 2, the rotating direction of the second impeller 2 is opposite to that of the first impeller 1, the moving direction of airflow formed when the first impeller 1 rotates is the same as the running direction of airflow formed when the second impeller 2 rotates, and combined air supply is formed. The chord length of the first blade 11 along the circumferential direction is different from the chord length of the second blade 21 along the circumferential direction in the change rule in the radial direction, the chord length of the first blade 11 along the circumferential direction gradually increases from inside to outside along the radial direction of the first impeller 1, and the chord length of the second blade 21 along the circumferential direction increases from inside to outside along the radial direction of the second impeller 2 and then decreases, so that the pneumatic characteristic of the airflow formed by the second impeller 2 is different from the pneumatic characteristic 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 the air pressure fluctuation and reducing the noise generated when the air supply fan operates.

Example two

The present embodiment provides a blower fan, as shown in fig. 1 and 2, including a first impeller 1, a second impeller 2, and a motor assembly. The first impeller 1 and the second impeller 2 are coaxially arranged, a plurality of first blades 11 arranged along the circumferential direction are arranged on the first impeller 1, a plurality of second blades 21 arranged along the circumferential direction are arranged on the second impeller 2, and the rotating direction of the second impeller 2 is opposite to that of the first impeller 1. The first impeller 1 is arranged on the air inlet side of the air supply fan, the second impeller 2 is arranged on the air outlet side of the air supply fan, the moving direction of airflow formed when the first impeller 1 rotates is the same as the moving direction of airflow formed when the second impeller 2 rotates, combined air supply is formed, and the airflow sequentially passes through the first impeller 1 and the second impeller 2 and is sent out outwards. The motor assembly is respectively in transmission connection with the first impeller 1 and the second impeller 2 so as to drive the first impeller 1 and the second impeller 2 to rotate. The chord length of the first blade 11 in the circumferential direction and the chord length of the second blade 21 in the circumferential direction have different changing laws in the radial direction, 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, and the chord length of the second blade 21 in the circumferential direction increases from inside to outside in the radial direction of the second impeller 2 and then decreases.

Specifically, as shown in fig. 3, five concentric circular surfaces are formed by taking the rotation axis of the second impeller 2 as a center line, the second blade 21 forms five sections on the five concentric circular surfaces, the projection of the five sections on a plane perpendicular to the rotation axis of the second impeller 2 forms five arc segments, 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 are respectively arranged from inside to outside along the radial direction of the second blade 21, the first arc segment 31 is arranged at the inner edge position of the second blade 21 in the radial direction, the fifth arc segment 35 is arranged at the outer edge position of the second blade 21 in the radial direction, and the chord lengths between two end points of each arc segment are respectively a first chord length 41, a second chord length 42, a third chord length 43, a fourth chord length 44 and a fifth chord length 45. The lengths of the first chord length 41 to the fourth chord length 44 are gradually increased, 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 in the circumferential direction increases from inside to outside along the radial direction of the second impeller 2 and then decreases, and the corresponding cross section of the fourth arc line segment 34 is located in a 55% to 85% region of the second blade 21 in the radial direction from inside to outside. Through the arrangement, on one hand, the air volume of the second impeller 2 can be increased, on the other hand, the aerodynamic characteristics of the air flow formed by the second impeller 2 are different from the aerodynamic characteristics of the air flow formed by the first impeller 1, and particularly, the aerodynamic characteristics of the air flow in the area with larger rotating linear velocity in the second blade 21 can be effectively changed, so that the mutual interference between the first impeller 1 and the second impeller 2 is reduced, the air pressure fluctuation is reduced, and the noise generated when the air supply fan operates is reduced. Optionally, the cross section corresponding to the fourth arc segment 34 is located in an area of 58% to 82% of the second blade 21 in the radial direction from the inside to the outside, and further, the cross section corresponding to the fourth arc segment 34 is located in an area of 60% to 80% of the second blade 21 in the radial direction from the inside to the outside.

Further, 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 are disposed corresponding to the second blades 21.

EXAMPLE III

Specifically, as shown in fig. 4, five concentric circular surfaces are formed by taking the rotation axis of the second impeller 2 as a center line, the second blade 21 forms five sections on the five concentric circular surfaces, the projection of the five sections on a plane perpendicular to the rotation axis of the second impeller 2 forms five arc segments, 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 are respectively arranged from inside to outside along the radial direction of the second blade 21, the first arc segment 31 is arranged at the inner edge position of the second blade 21 in the radial direction, the fifth arc segment 35 is arranged at the outer edge position of the second blade 21 in the radial direction, and the chord lengths between two end points of each arc segment are respectively a first chord length 41, a second chord length 42, a third chord length 43, a fourth chord length 44 and a fifth chord length 45. The lengths of the first chord length 41 to the third chord length 43 are gradually increased, the length of the fourth chord length 44 is the same as that of the third chord length 43, the length of the fifth chord length 45 is smaller than that of the fourth chord length 44, so that the chord length of the second blade 21 in the circumferential direction is increased and then decreased from inside to outside along the radial direction of the second blade 2, the cross section corresponding to the fourth arc line segment 34 is located in a 55-85% region of the second blade 21 in the radial direction from inside to outside, and meanwhile, an equal-width region is formed in the regions of the third chord length 43 to the fourth chord length 44. Through the arrangement, on one hand, the air volume of the second impeller 2 can be increased, on the other hand, the aerodynamic characteristics of the air flow formed by the second impeller 2 are different from the aerodynamic characteristics of the air flow formed by the first impeller 1, and particularly, the aerodynamic characteristics of the air flow in the area with larger rotating linear velocity in the second blade 21 can be effectively changed, so that the mutual interference between the first impeller 1 and the second impeller 2 is reduced, the air pressure fluctuation is reduced, and the noise generated when the air supply fan operates is reduced. Optionally, the cross section corresponding to the fourth arc segment 34 is located in an area of 58% to 82% of the second blade 21 in the radial direction from the inside to the outside, and further, the cross section corresponding to the fourth arc segment 34 is located in an area of 60% to 80% of the second blade 21 in the radial direction from the inside to the outside.

Example four

Specifically, as shown in fig. 5, five concentric circular surfaces are formed by taking the rotation axis of the first impeller 1 as a center line, the first blade 11 forms five cross sections on the five concentric circular surfaces, the projection of the five cross sections on a plane perpendicular to the rotation axis of the first impeller 1 forms five arc line segments, the sixth arc line segment 36, the seventh arc line segment 37, the eighth arc line segment 38, the ninth arc line segment 39 and the tenth arc line segment 30 are respectively formed from inside to outside along the radial direction of the first blade 11, the sixth arc line segment 36 is located at the inner edge position of the first blade 11 in the radial direction, the tenth arc line segment 30 is located at the outer edge position of the first blade 11 in the radial direction, and the chord length between two end points of each arc line segment is 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 respectively. 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 arrangement, on one hand, the air volume of the first impeller 1 can be increased, on the other hand, the aerodynamic characteristics of the airflow formed by the first impeller 1 are different from the aerodynamic characteristics of the airflow formed by the second impeller 2, and particularly, the aerodynamic characteristics of the airflow in the region with the higher rotation linear velocity in the first blade 11 can be effectively changed, so that the mutual interference between the first impeller 1 and the second impeller 2 is reduced, the air pressure fluctuation is reduced, and the noise generated when the air supply fan operates is reduced.

EXAMPLE five

Specifically, as shown in fig. 3, five concentric circular surfaces are formed by taking the rotation axis of the second impeller 2 as a center line, the second blade 21 forms five sections on the five concentric circular surfaces, the projection of the five sections on a plane perpendicular to the rotation axis of the second impeller 2 forms five arc segments, 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 are respectively arranged from inside to outside along the radial direction of the second blade 21, the first arc segment 31 is arranged at the inner edge position of the second blade 21 in the radial direction, the fifth arc segment 35 is arranged at the outer edge position of the second blade 21 in the radial direction, and the chord lengths between two end points of each arc segment are respectively a first chord length 41, a second chord length 42, a third chord length 43, a fourth chord length 44 and a fifth chord length 45. The lengths of the first chord length 41 to the fourth chord length 44 are gradually increased, 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 in the circumferential direction increases from inside to outside along the radial direction of the second impeller 2 and then decreases, and the corresponding cross section of the fourth arc line segment 34 is located in an area of 60% to 80% of the second blade 21 in the radial direction from inside to outside.

As shown in fig. 5, five concentric circular surfaces are formed by taking the rotation axis of the first impeller 1 as a center line, the first blade 11 forms five sections on the five concentric circular surfaces, the projections of the five sections on a plane perpendicular to the rotation axis of the first impeller 1 form five arc line segments, a sixth arc line segment 36, a seventh arc line segment 37, an eighth arc line segment 38, a ninth arc line segment 39 and a tenth arc line segment 30 are respectively arranged from inside to outside along the radial direction of the first blade 11, the sixth arc line segment 36 is arranged at the inner edge position of the first blade 11 in the radial direction, the tenth arc line segment 30 is arranged at the outer edge position of the first blade 11 in the radial direction, and the chord length between two end points of each arc line segment is respectively a sixth chord length 46, a seventh chord length 47, an eighth chord length 48, a ninth chord length 49 and a tenth chord length 40. 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 arrangement, on one hand, the air volume of the first impeller 1 can be increased, on the other hand, the aerodynamic characteristics of the airflow formed by the first impeller 1 are different from the aerodynamic characteristics of the airflow formed by the second impeller 2, and particularly, the aerodynamic characteristics of the airflow in the region with the higher rotation linear velocity in the first blade 11 can be effectively changed, so that the mutual interference between the first impeller 1 and the second impeller 2 is reduced, the air pressure fluctuation is reduced, and the noise generated when the air supply fan operates is reduced.

The length of the fourth chord length 44 may be the same as the length of the third chord length 43, and in this case, an equal-width region is formed in the second blade 21 in the region of the third chord length 43 to the fourth chord length 44.

EXAMPLE six

The present embodiment provides a blower fan, as shown in fig. 6 and 7, including a first impeller 1, a second impeller 2, and a motor assembly. The first impeller 1 and the second impeller 2 are coaxially arranged, a plurality of first blades 11 arranged along the circumferential direction are arranged on the first impeller 1, a plurality of second blades 21 arranged along the circumferential direction are arranged on the second impeller 2, and the rotating direction of the second impeller 2 is opposite to that of the first impeller 1. The second impeller 2 is arranged on the air inlet side of the air supply fan, the first impeller 1 is arranged on the air outlet side of the air supply fan, the moving direction of airflow formed when the second impeller 2 rotates is the same as the moving direction of airflow formed when the first impeller 1 rotates, combined air supply is formed, and the airflow sequentially penetrates through the second impeller 2 and the first impeller 1 and is sent out. The motor assembly is respectively in transmission connection with the first impeller 1 and the second impeller 2 so as to drive the first impeller 1 and the second impeller 2 to rotate. The chord length of the first blade 11 in the circumferential direction and the chord length of the second blade 21 in the circumferential direction have different changing laws in the radial direction, 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, and the chord length of the second blade 21 in the circumferential direction increases from inside to outside in the radial direction of the second impeller 2 and then decreases.

EXAMPLE seven

The embodiment provides an outdoor unit of an air conditioner, which comprises a shell, a heat exchanger and an air supply fan in any one of the first embodiment to the sixth embodiment. The heat exchanger and the air supply fan are arranged in the shell, the air supply fan and the heat exchanger are arranged correspondingly, when the outdoor unit of the air conditioner operates, air flowing in the shell is accelerated through operation of the air supply fan, heat exchange efficiency of the heat exchanger is improved, and heat dissipation of the outdoor unit of the air conditioner is promoted. Through the first impeller 1 and the second impeller 2 in the air supply fan, a heat dissipation grid or a heat dissipation hole is arranged on the shell, so that air flow can be discharged out of the shell through the heat dissipation grid or the heat dissipation hole. The outdoor unit of an air conditioner in this embodiment further has all the advantages of the air supply fan in any one of the first to sixth embodiments, which are not described herein again.

Example eight

The embodiment provides an air conditioner, which comprises an indoor unit and the air conditioner outdoor unit in the seventh embodiment, wherein the indoor unit is connected with the air conditioner outdoor unit so as to realize the regulation of indoor air through the circulation of a refrigerant between the indoor unit and the air conditioner outdoor unit. Meanwhile, the air supply fan in the air conditioner outdoor unit can reduce the mutual interference between the first impeller 1 and the second impeller 2, so that the air pressure fluctuation between the first impeller 1 and the second impeller 2 is reduced, and the noise reduction is facilitated. 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, which are not described herein again.

Above combine the figure to explain in detail the technical scheme of the utility model, through the structure that changes first blade and second blade among the air supply fan, make the produced air current of first impeller and second impeller produce the aerodynamic characteristic difference, reduce the mutual interference between first impeller and the second impeller to it is undulant to reduce atmospheric pressure, noise when reducing the air supply fan operation.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A blower fan, comprising:

the first impeller is provided with a plurality of first blades along the circumferential direction;

a second impeller, wherein the second impeller is provided with a plurality of second blades along the circumferential direction, the second impeller and the first impeller are coaxially arranged, the rotation direction of the second impeller is opposite to that of the first impeller,

the chord length of the first blade along the circumferential direction is different from the chord length of the second blade along the circumferential direction in the change rule in the radial direction.

2. The blower of claim 1,

the first blade is along the chord length of circumferencial direction radially from inside to outside crescent of first impeller, the second blade is along the chord length of circumferencial direction radially from inside to outside increase earlier the back reduce.

3. The blower of claim 2,

the cross sections of the first blades on a plurality of concentric circular surfaces with the rotation axis of the air supply fan as a central line are projected into a plane perpendicular to the rotation axis to form a plurality of arc line sections, and the chord lengths of the plurality of arc line sections corresponding to the first blades are gradually increased from inside to outside along the radial direction of the first impeller;

the cross sections of the second blades on a plurality of concentric circular surfaces with the rotating axis of the air supply fan as a central line are projected into a plane perpendicular to the rotating axis to form a plurality of arc line sections, and the chord lengths of the plurality of arc line sections corresponding to the second blades are increased from inside to outside and then reduced along the radial direction of the second impeller.

4. The blower of claim 3,

the plurality of arc segments corresponding to the second blade sequentially comprise a first arc segment, a second arc segment, a third arc segment, a fourth arc segment and a fifth arc segment along the radial direction, the chord length from the first arc segment to the third arc segment is sequentially increased, the chord length of the fourth arc segment is larger than or equal to the chord length of the third arc segment, and the chord length of the fifth arc segment is smaller than the chord length of the fourth arc segment.

5. The blower of claim 4,

the plurality of arc segments corresponding to the first blade sequentially comprise a sixth arc segment, a seventh arc segment, an eighth arc segment, a ninth arc segment and a tenth arc segment along the radial direction, and the chord lengths from the sixth arc segment to the tenth arc segment are sequentially increased.

6. The blower of claim 5,

and the section corresponding to the fourth arc line segment is positioned in an area of 55 to 85 percent of the second blade in the radial direction from inside to outside.

7. The blower of claim 6,

the first impeller is arranged on the air inlet side of the air supply fan, the second impeller is arranged on the air outlet side of the air supply fan, and air flow sequentially penetrates through the first impeller and the second impeller.

8. The blower of claim 6,

the second impeller is arranged on the air inlet side of the air supply fan, the first impeller is arranged on the air outlet side of the air supply fan, and the airflow sequentially penetrates through the second impeller and the first impeller.

9. The blower of claim 6,

the number of the first blades of the first impeller is the same as that of the second blades of the second impeller, and the first blades and the second blades are correspondingly arranged.

10. The blower of any one of claims 1-9, further comprising:

and the motor assembly is in transmission connection with the first impeller and the second impeller respectively so as to drive the first impeller and the second impeller to rotate respectively.

11. An outdoor unit of an air conditioner, comprising:

a housing;

the heat exchanger is arranged in the shell;

the blower of any one of claims 1-10, disposed in the housing in correspondence with the heat exchanger.

12. An air conditioner, comprising:

an indoor unit;

the outdoor unit of claim 11, connected to the indoor unit.