CN110748984A - Air supply fan, air conditioner outdoor unit and air conditioner - Google Patents

Abstract

The invention provides an air supply fan, an air conditioner outdoor unit and an air conditioner, wherein the air supply fan comprises: 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 blades are arranged on the air outlet side of the first impeller and are coaxially arranged with the first impeller, and the rotating direction of the second impeller is opposite to that of the first impeller, wherein the edge line of the second blades on the air inlet side of the second impeller inclines gradually from inside to outside to the air outlet side of the second impeller along the radial direction of the second impeller; and/or the edge line of the first blade on the air inlet side of the first impeller gradually inclines towards the air inlet side of the first impeller from inside to outside along the radial direction of the first impeller. According to the technical scheme, the air flow generated by the first impeller and the air flow generated by the second impeller generate the difference of pneumatic characteristics, and the mutual interference between the first impeller and the second impeller is reduced, so that the pressure fluctuation is reduced, and the noise is reduced.

Description

Air supply fan, air conditioner outdoor unit and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air supply fan, an air conditioner outdoor unit and an air conditioner.

Background

At present, the application of the cyclone fan is increasingly common in the field of air conditioners. The common counter-rotating fan has the advantages that due to the fact that the front and rear two-stage impellers are identical in structure and the pneumatic loading rule in the axial direction, when air flow passes through the two-stage impellers, mutual interference is easily formed between the two-stage impellers, the pressure fluctuation of the air outlet side of the blades is caused, pressure pulsation is generated in the area between the two-stage impellers, the air supply noise of the fan is increased, and the use comfort of the air conditioner is affected.

Disclosure of Invention

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

To this end, an object of the present invention is to provide a blower 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, a first aspect of the present invention provides a blower 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 blades are arranged on the air outlet side of the first impeller and are coaxially arranged with the first impeller, and the rotating direction of the second impeller is opposite to that of the first impeller, wherein the edge line of the second blades on the air inlet side of the second impeller inclines gradually from inside to outside to the air outlet side of the second impeller along the radial direction of the second impeller; and/or the edge line of the first blade on the air inlet side of the first impeller gradually inclines towards the air inlet side of the first impeller from inside to outside along the radial direction of the first impeller.

According to the technical scheme of the first aspect of the invention, the air supply fan comprises a first impeller and a 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 second impeller is arranged on the air outlet side of the first impeller, so that the air flow sequentially passes through the first impeller and the second impeller and is sent out. Edge line through setting up the second blade in the air inlet side of second impeller is along the radial slope of the air-out side direction of second impeller from inside to outside gradually of second impeller for distance between second impeller and the first impeller increases gradually from inside to outside along radial direction, and the aerodynamic characteristic of the air current that the second impeller formed produces the difference with the aerodynamic characteristic that the first impeller formed, thereby reduce the mutual interference between second impeller and the first impeller, reduce the regional interior pressure fluctuation between second impeller and the first impeller, the noise reduction, improve air supply fan's use travelling comfort. In addition, the edge line of the air inlet side of the first impeller is arranged to gradually incline towards the air inlet side of the first impeller from inside to outside along the radial direction of the first impeller, so that the pneumatic characteristic of the airflow formed by the first impeller and the pneumatic characteristic of the airflow formed by the second impeller are different, the mutual interference between the first impeller and the second impeller is reduced, the pressure fluctuation in the area between the first impeller and the second impeller is reduced, the noise is reduced, and the use comfort of the air supply fan is improved.

It should be emphasized that, in this scheme, the structure of any one of the first impeller or the second impeller may be improved, or the structures of the first impeller and the second impeller may be improved at the same time, so that the effect of reducing noise in this scheme can be achieved.

When the blower fan is operated, the first impeller and the second impeller are both in a high-speed rotation state, and if pressure in a region between the first impeller and the second impeller fluctuates, noise increases. Particularly in the region of the outer edge of the blade in the radial direction, since the linear velocity of the blade in this region is the greatest, it is more sensitive to pressure fluctuations and more likely to cause an increase in noise.

In the above technical solution, the second blade forms a plurality of cross sections on a plurality of concentric circular surfaces using the rotation axis of the second impeller as the center line, the projection of the plurality of cross sections on the first plane at the end point of the air inlet side of the second impeller gradually shifts to the air outlet side direction from inside to outside along the radial direction of the second impeller, wherein a first connection line is formed between two end points of the edge line of one end of the second blade far from the rotation axis, the radial ray direction perpendicular to the first connection line is the first radial direction, and the first plane is a plane perpendicular to the first radial direction.

In this embodiment, the second blade can be formed with a plurality of cross sections on a plurality of concentric circular surfaces by providing a plurality of concentric circular surfaces having the rotation axis of the second impeller as the center line. A first connecting line is formed between two end points of an edge line of one end, far away from the rotation axis, of the second blade, and the first plane is perpendicular to the first radius direction by limiting the radial ray direction perpendicular to the first connecting line to be the first radius direction, so that the first plane is taken as a projection plane, and the second blade is convenient to analyze. The projection of the plurality of sections of the second blade in the first plane is arranged at the end point of the air inlet side of the second impeller and gradually deviates to the air outlet side from inside to outside along the radial direction of the second impeller, so that the arrangement rule of the plurality of sections accords with the integral inclination rule of the edge line of the second blade on the air inlet side of the second impeller, the pneumatic characteristic of the air flow generated by the second impeller is different from that of the air flow generated by the first impeller, and the noise reduction is realized.

In the above technical solution, the plurality of cross sections sequentially include a first cross section, a second cross section, a third cross section, a fourth cross section and a fifth cross section along the radial direction, the first cross section is located at an inner edge of the second blade along the radial direction, and the fifth cross section is located at an outer edge of the second blade along the radial direction, wherein projections of the first cross section to the fifth cross section on the first plane are offset from inside to outside in the direction of the air inlet side of the second impeller along the radial direction of the second impeller.

In the technical scheme, the plurality of cross sections corresponding to the second blade sequentially comprise a first cross section, a second cross section, a third cross section, a fourth cross section and a fifth cross section along the radial direction, the first cross section is positioned at the inner edge of the second blade along the radial direction, the fifth cross section is positioned at the outer edge of the second blade along the radial direction, and the change rule of the first cross section to the fifth cross section is in accordance with the integral inclination rule of the edge line of the second blade at the air inlet side of the second blade by setting the end point of the projection of the first cross section to the fifth cross section on the first plane at the air inlet side of the second blade and gradually deviating towards the air outlet side from inside to outside along the radial direction of the second blade, so that the pneumatic characteristic of the air flow generated by the second blade is different from that of the air flow generated by the first blade, and further the noise reduction is realized.

In the above technical solution, the second cross section is located in an area of 15% to 25% of the second blade in a direction from the first cross section to the fifth cross section; the fourth cross section is located in an area of 55% to 85% of the second blade in a direction from the first cross section to the fifth cross section.

In the technical scheme, the second cross section is arranged in a 15-25% area of the second blade in the direction from the first cross section to the fifth cross section, the fourth cross section is arranged in a 55-85% area of the second blade in the direction from the first cross section to the fifth cross section, so that the fourth cross section is close to the area of the outer edge of the second blade in the radial direction, the second cross section is close to the area of the inner edge of the second blade in the radial direction, structural shapes of different areas on the second blade are represented respectively, and a change rule of the second blade from the second cross section to the fourth cross section is represented simultaneously. Optionally, the second cross-section is located in an area of 18% to 22% of the second blade in a direction from the first cross-section to the fifth cross-section, and the fourth cross-section is located in an area of 58% to 82% of the second blade in a direction from the first cross-section to the fifth cross-section. Further, the second cross section is located at a position 20% in a direction from the first cross section to the fifth cross section of the second blade, and the fourth cross section is located in a region 60% to 80% in the direction from the first cross section to the fifth cross section of the second blade.

In the technical scheme, the axial distance between the end point of the first section on the air inlet side and the end point of the second section on the air inlet side is a first distance; the axial distance between the end point of the fourth section on the air inlet side and the end point of the fifth section on the air inlet side is a second distance, wherein the ratio of the second distance to the first distance is in the ratio range of 0.8 to 2.8. Further, a ratio of the second distance to the first distance is in a ratio range of 1.0 to 2.5.

In the technical scheme, the axial distance between the end point of the first cross section on the air inlet side and the end point of the second cross section on the air inlet side is a first distance, the distance between the end point of the fourth cross section on the air inlet side and the end point of the fifth cross section on the air inlet side is a second distance, and the ratio of the second distance to the first distance is set to be in the ratio range of 0.8-2.8, so that the value range of the second distance relative to the first distance is larger, namely the range of the relative position between the fourth cross section and the fifth cross section is larger, the inclination degree of the edge line of the second blade on the air inlet side in the area close to the outer edge of the radial direction can be larger, the pressure fluctuation in the area can be further reduced, and the noise generated by the pressure fluctuation can be reduced.

In the above technical solution, the first blade forms a plurality of cross sections on a plurality of concentric circular surfaces with the rotation axis of the first impeller as a center line, the projection of the plurality of cross sections on the second plane is at the end point of the air inlet side of the first impeller, and the cross sections gradually deviate to the air inlet side direction from inside to outside along the radial direction of the first impeller, wherein a second connecting line is formed between two end points of the edge line of one end of the first blade away from the rotation axis, the radial ray direction perpendicular to the second connecting line is a second radial direction, and the second plane is a plane perpendicular to the second radial direction.

In this embodiment, the first blade can be formed with a plurality of cross sections on a plurality of concentric circular surfaces by providing the plurality of concentric circular surfaces with the rotation axis of the first impeller as the center line. A second connecting line is formed between two end points of an edge line of one end, far away from the rotation axis, of the first blade, and the second plane is perpendicular to the second radius direction by limiting the radial ray direction perpendicular to the second connecting line to be the second radius direction, so that the second plane is taken as a projection plane, and the first blade is convenient to analyze. The projection of the plurality of sections of the first blade in the second plane is arranged at the end point of the air inlet side of the first impeller, and the projection of the plurality of sections of the first blade in the second plane gradually deviates from the air outlet side along the radial direction of the first impeller from inside to outside, so that the arrangement rule of the plurality of sections accords with the integral inclination rule of the edge line of the first blade on the air inlet side of the first impeller, the pneumatic characteristic of the air flow generated by the first impeller is different from that of the air flow generated by the second impeller, and the noise reduction is realized.

In the above technical solution, the plurality of cross sections sequentially include a sixth cross section, a seventh cross section, an eighth cross section, a ninth cross section and a tenth cross section along the radial direction, the sixth cross section is located at an inner edge of the first blade along the radial direction, the tenth cross section is located at an outer edge of the first blade along the radial direction, wherein a projection of the sixth cross section to the tenth cross section on the second plane is offset from inside to outside towards the air inlet side gradually along the radial direction of the first blade at an end point of the air inlet side of the first blade.

In the technical scheme, the plurality of sections corresponding to the first blade sequentially include a sixth section, a seventh section, an eighth section, a ninth section and a tenth section along the radial direction, wherein the sixth section is located at the inner edge of the first blade along the radial direction, the tenth section is located at the outer edge of the first blade along the radial direction, and the setting rules of the plurality of sections are made to conform to the overall inclination rule of the edge line of the first blade on the air inlet side of the first blade by setting the end point of the projection of the sixth section to the tenth section on the second plane on the air inlet side of the first blade and gradually offsetting the first blade from inside to outside along the radial direction of the first blade, so that the aerodynamic characteristics of the air flow generated by the first blade are different from those of the air flow generated by the second blade, and further noise reduction is realized.

In the above technical solution, the seventh cross section is located in an area of 15% to 25% in a direction from the sixth cross section to the tenth cross section of the first blade, and the ninth cross section is located in an area of 55% to 85% in a direction from the sixth cross section to the tenth cross section of the first blade.

In the technical scheme, the seventh cross section is arranged in an area of 15-25% of the first blade in the direction from the sixth cross section to the tenth cross section, the ninth cross section is arranged in an area of 55-85% of the first blade in the direction from the sixth cross section to the tenth cross section, so that the ninth cross section is close to an area of an outer edge of the first blade in the radial direction, and the seventh cross section is close to an area of an inner edge of the first blade in the radial direction, so that structural shapes of different areas on the first blade are respectively represented, and a change rule of the first blade from the seventh cross section to the ninth cross section is represented. Optionally, the seventh cross-section is located in an area 18% to 22% of the first blade in a direction from the sixth cross-section to the tenth cross-section, and the ninth cross-section is located in an area 58% to 82% of the first blade in a direction from the sixth cross-section to the tenth cross-section. Further, the seventh cross section is located at a position 20% in the direction from the sixth cross section to the tenth cross section of the first blade, and the ninth cross section is located in a region 60% to 80% in the direction from the sixth cross section to the tenth cross section of the first blade.

In the above technical solution, an axial distance between an end point of the sixth section on the air inlet side and an end point of the seventh section on the air inlet side is a third distance; the axial distance between the end point of the ninth section on the air inlet side and the end point of the tenth section on the air inlet side is a fourth distance, wherein the ratio of the fourth distance to the third distance is in the ratio range of 0.8 to 2.8.

In the technical scheme, the axial distance between the end point of the sixth cross section on the air inlet side and the end point of the seventh cross section on the air inlet side is a third distance, the distance between the end point of the ninth cross section on the air inlet side and the end point of the tenth cross section on the air inlet side is a fourth distance, and the ratio of the fourth distance to the third distance is set to be in the ratio range of 0.8 to 2.8, so that the value range of the fourth distance relative to the third distance is larger, namely the range of the relative position between the ninth cross section and the tenth cross section is larger, the inclination degree of the edge line of the first blade on the air inlet side in the area close to the outer edge in the radial direction can be larger, the pressure fluctuation in the area can be further reduced, and the noise generated by the pressure fluctuation can be reduced. Further, a ratio of the fourth distance to the third distance is in a ratio range of 1.0 to 2.5.

In the above technical solution, the number of the first blades in the first impeller is greater than or less than the number of the second blades in the second impeller.

In the technical scheme, the number of the first blades in the first impeller is larger than or smaller than the number of the second blades in the second impeller, so that the number of the blades of the first impeller is different from that of the blades of the second impeller, and further pneumatic difference is generated between airflow formed by the first impeller and airflow formed by the second impeller, so that pressure fluctuation between the first impeller and the second impeller is further reduced, and the noise generated during the operation of the air supply fan is further reduced.

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.

In a second aspect of the present invention, an outdoor unit of an air conditioner is provided, including: 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 a second aspect of the present invention, an outdoor unit of an air conditioner includes a casing, a heat exchanger, and a blower 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. In addition, the outdoor unit of the air conditioner also has all the beneficial effects of the air supply fan in the technical scheme of the first aspect of the invention, and the details are not repeated herein.

In a third aspect of the present invention, an air conditioner is provided, including: 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 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, and in part will be obvious from the description, 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 a supply air fan according to one embodiment of the invention;

FIG. 2 shows a schematic view of a supply air fan according to an embodiment of the 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 projection of a second blade 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 a projection of a first blade according to an embodiment of the invention.

Wherein, the correspondence between the reference numbers and the components in fig. 1 to 6 is as follows:

1 first vane, 11 first vane, 2 second vane, 21 second vane, 31 first connecting line, 32 first radial direction, 33 first plane, 34 second connecting line, 35 second radial direction, 36 second plane, 41 first cross section, 42 second cross section, 43 third cross section, 44 fourth cross section, 45 fifth cross section, 46 sixth cross section, 47 seventh cross section, 48 eighth cross section, 49 ninth cross section, 40 tenth cross section, 51 first projection, 52 second projection, 53 third projection, 54 fourth projection, 55 fifth projection, 56 sixth projection, 57 seventh projection, 58 eighth projection, 59 ninth projection, 50 tenth projection.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. 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.

A blower 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 6.

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, and the rotating direction of the second impeller 2 is opposite to that of the first impeller 1. The second impeller 2 is positioned on the air outlet side of the first impeller 1, and when the air supply fan operates, airflow sequentially passes through the first impeller 1 and the second impeller 2 and then is sent out. The edge line of the second blade 21 on the air inlet side of the second impeller 2 is inclined from inside to outside to the air outlet side of the second impeller 2 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 the 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 second impeller 2 is positioned on the air outlet side of the first impeller 1, and when the air supply fan operates, airflow sequentially passes through the first impeller 1 and the second impeller 2 and then 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. Wherein, the number of the first blades 11 of the first impeller 1 is different from the number of the second blades 21 of the second impeller 2, the number of the first blades 11 is six, and the number of the second blades 21 is seven. The edge line of the second blade 21 on the air inlet side of the second impeller 2 is gradually inclined towards the air outlet side of the second impeller 2 from inside to outside along the radial direction of the second impeller 2, so that the pneumatic characteristic of the airflow formed by the second impeller 2 is different from that of the airflow formed by the first impeller 1, the mutual interference between the first impeller 1 and the second impeller 2 is reduced, the pressure fluctuation is reduced, and the noise generated when the air supply fan operates is reduced. Specifically, as shown in fig. 3, the second blade 21 forms five sections on the five concentric circular surfaces with the rotation axis of the second impeller 2 as the center line, the first section 41, the second section 42, the third section 43, the fourth section 44 and the fifth section 45 are arranged from inside to outside in the radial direction, the first section 41 is located at the inner edge of the second blade 21 in the radial direction, and the fifth section 45 is located at the outer edge of the second blade 21 in the radial direction. As shown in fig. 4, the projections of the first to fifth cross sections 41 to 45 on the first plane 33 are respectively a first projection 51, a second projection 52, a third projection 53, a fourth projection 54 and a fifth projection 55, and the end points of the first to fifth projections 51 to 55 on the wind inlet side of the second impeller 2 are gradually shifted from the inside to the outside in the radial direction of the second impeller 2 toward the wind outlet side. A first connecting line 31 is formed between two end points of an edge line of one end of the second blade 21 away from the rotation axis, a radial direction on the second impeller 2 perpendicular to the first connecting line 31 is a first radial direction 32, and a first plane 33 is a projection plane perpendicular to the first radial direction 32.

It should be noted that the number of the first blades 11 of the first impeller 1 may be equal to or greater than the number of the second blades 21 of the second impeller 2.

EXAMPLE III

The air supply fan in the embodiment is further improved on the basis of the second embodiment. The second cross section 42 is located in the area of 15% to 25% in the direction from the first cross section 41 to the fifth cross section 45 of the second blade 21, and the fourth cross section 44 is located in the area of 55% to 85% in the direction from the first cross section 41 to the fifth cross section 45 of the second blade 21, so that the fourth cross section 44 is located near the area of the outer edge in the radial direction of the second blade 21, and the second cross section 42 is located near the area of the inner edge in the radial direction of the second blade 21. Further, the second section 42 is located in an area of 18% to 22% in a direction from the first section 41 to the fifth section 45 of the second blade 21, and the fourth section 44 is located in an area of 58% to 82% in a direction from the first section 41 to the fifth section 45 of the second blade 21. Further, the second section 42 is located at a position 20% in the direction from the first section 41 to the fifth section 45 of the second blade 21, and the fourth section 44 is located in a region 60% to 80% in the direction from the first section 41 to the fifth section 45 of the second blade 21.

As shown in fig. 4, a first distance H1 exists in the axial direction between the end point of the second projection 52 on the air inlet side and the end point of the first projection 51 on the air inlet side, a second distance H2 exists in the axial direction between the end point of the fifth projection 55 on the air inlet side and the end point of the fourth projection 54 on the air inlet side, and the ratio of the second distance H2 to the first distance H1 ranges from 0.8 to 2.8. Further, the ratio between the second distance H2 and the first distance H1 ranges from 1.0 to 2.5.

Example four

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, and the rotating direction of the second impeller 2 is opposite to that of the first impeller 1. The second impeller 2 is positioned on the air outlet side of the first impeller 1, and when the air supply fan operates, airflow sequentially passes through the first impeller 1 and the second impeller 2 and then is sent out. The edge line of the first blade 11 on the air inlet side of the first impeller 1 is inclined from inside to outside to the air inlet side of the first impeller 1 along the radial direction of the first impeller 1, so that 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, thereby reducing the mutual interference between the first impeller 1 and the second impeller 2, reducing the pressure fluctuation and reducing the noise generated when the air supply fan operates.

It should be noted that, in this embodiment, the edge line of the first blade 11 on the air outlet side of the first impeller 1 may be gradually inclined from inside to outside to the air inlet side of the first impeller 1 along the radial direction of the first impeller 1, and may also play a role in reducing noise.

EXAMPLE five

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 second impeller 2 is positioned on the air outlet side of the first impeller 1, and when the air supply fan operates, airflow sequentially passes through the first impeller 1 and the second impeller 2 and then 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 number of the first blades 11 of the first impeller 1 is different from the number of the second blades 21 of the second impeller 2, the number of the first blades 11 is six, and the number of the second blades 21 is seven. The edge line of the first blade 11 on the air inlet side of the first impeller 1 is gradually inclined towards the air inlet side of the first impeller 1 from inside to outside along the radial direction of the first impeller 1, so that the pneumatic characteristic of the air flow formed by the first impeller 1 is different from that of the air flow formed by the second impeller 2, the mutual interference between the first impeller 1 and the second impeller 2 is reduced, the pressure fluctuation is reduced, and the noise generated when the air supply fan operates is reduced.

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 sections on the five concentric circular surfaces, which are a sixth section 46, a seventh section 47, an eighth section 48, a ninth section 49 and a tenth section 40 in order from inside to outside in the radial direction, and the sixth section 46 is located at the inner edge of the first blade 11 in the radial direction and the tenth section 40 is located at the outer edge of the first blade 11 in the radial direction. As shown in fig. 6, the projections of the sixth to tenth cross-sections 46 to 40 on the second plane 36 are a sixth projection 56, a seventh projection 57, an eighth projection 58, a ninth projection 59, and a tenth projection 50, respectively, and the end points of the sixth to tenth projections 56 to 50 on the air intake side of the first impeller 1 are gradually shifted from inside to outside in the radial direction of the first impeller 1 toward the air outlet side. A second connecting line 34 is formed between two end points of an edge line of one end of the first blade 11 away from the rotation axis, a radial direction on the first impeller 1 perpendicular to the second connecting line 34 is a second radial direction 35, and a second plane 36 is a projection plane perpendicular to the second radial direction 35.

It should be noted that, in this embodiment, the edge line of the first blade 11 on the air outlet side of the first impeller 1 may be gradually inclined from inside to outside to the air inlet side of the first impeller 1 along the radial direction of the first impeller 1, and may also play a role in reducing noise. Further, the number of the first blades 11 of the first impeller 1 may also be equal to or greater than the number of the second blades 21 of the second impeller 2.

EXAMPLE six

The air supply fan in the embodiment is further improved on the basis of the fifth embodiment. The seventh cross section 47 is located in the area of 15% to 25% in the direction from the sixth cross section 46 to the tenth cross section 40 of the first blade 11, and the ninth cross section 49 is located in the area of 55% to 85% in the direction from the sixth cross section 46 to the tenth cross section 40 of the first blade 11, so that the ninth cross section 49 is close to the area of the outer edge in the radial direction of the first blade 11, and the seventh cross section 47 is close to the area of the inner edge in the radial direction of the first blade 11. Further, the seventh cross section 47 is located in the region of 18% to 22% in the direction of the first blade 11 from the sixth cross section 46 to the tenth cross section 40, and the ninth cross section 49 is located in the region of 58% to 82% in the direction of the first blade 11 from the sixth cross section 46 to the tenth cross section 40. Further, the seventh cross section 47 is located at 20% of the first blade 11 in the direction from the sixth cross section 46 to the tenth cross section 40, and the ninth cross section 49 is located in the region from 60% to 80% of the first blade 11 in the direction from the sixth cross section 46 to the tenth cross section 40.

As shown in fig. 6, a third distance H3 exists in the axial direction between the end point of the seventh projection 57 on the air inlet side and the end point of the sixth projection 56 on the air inlet side, a fourth distance H4 exists in the axial direction between the end point of the tenth projection 50 on the air inlet side and the end point of the ninth projection 59 on the air inlet side, and the ratio of the fourth distance H4 to the third distance H3 ranges from 0.8 to 2.8. Further, the ratio between the fourth distance H4 and the third distance H3 ranges from 1.0 to 2.5.

EXAMPLE seven

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 second impeller 2 is positioned on the air outlet side of the first impeller 1, and when the air supply fan operates, airflow sequentially passes through the first impeller 1 and the second impeller 2 and then 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 number of the first blades 11 of the first impeller 1 is different from the number of the second blades 21 of the second impeller 2, the number of the first blades 11 is six, and the number of the second blades 21 is seven. The edge line of the second blade 21 on the air inlet side of the second impeller 2 inclines gradually from inside to outside to the air outlet side direction of the second impeller 2 along the radial direction of the second impeller 2, the edge line of the first blade 11 on the air inlet side of the first impeller 1 inclines gradually from inside to outside to the air inlet side direction of the first impeller 1 along the radial direction of the first impeller 1, 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 pressure fluctuation and reducing the noise generated when the air supply fan operates.

Specifically, as shown in fig. 3, the second blade 21 forms five sections on the five concentric circular surfaces with the rotation axis of the second impeller 2 as the center line, the first section 41, the second section 42, the third section 43, the fourth section 44 and the fifth section 45 are arranged from inside to outside in the radial direction, the first section 41 is located at the inner edge of the second blade 21 in the radial direction, and the fifth section 45 is located at the outer edge of the second blade 21 in the radial direction. As shown in fig. 4, the projections of the first to fifth cross sections 41 to 45 on the first plane 33 are respectively a first projection 51, a second projection 52, a third projection 53, a fourth projection 54 and a fifth projection 55, and the end points of the first to fifth projections 51 to 55 on the wind inlet side of the second impeller 2 are gradually shifted from the inside to the outside in the radial direction of the second impeller 2 toward the wind outlet side. A first connecting line 31 is formed between two end points of an edge line of one end of the second blade 21 away from the rotation axis, a radial direction on the second impeller 2 perpendicular to the first connecting line 31 is a first radial direction 32, and a first plane 33 is a projection plane perpendicular to the first radial direction 32. The second section 42 is located 20% in the direction from the first section 41 to the fifth section 45 of the second blade 21, and the fourth section 44 is located in the region 60% to 80% in the direction from the first section 41 to the fifth section 45 of the second blade 21. As shown in fig. 4, a first distance H1 exists in the axial direction between the end point of the second projection 52 on the air inlet side and the end point of the first projection 51 on the air inlet side, a second distance H2 exists in the axial direction between the end point of the fifth projection 55 on the air inlet side and the end point of the fourth projection 54 on the air inlet side, and the ratio of the second distance H2 to the first distance H1 ranges from 1.0 to 2.5.

As shown in fig. 5, the first blade 11 has five concentric circular surfaces with the rotation axis of the first impeller 1 as the center line, the five concentric circular surfaces have five sections, namely, a sixth section 46, a seventh section 47, an eighth section 48, a ninth section 49 and a tenth section 40 in the radial direction from inside to outside, the sixth section 46 is located at the inner edge of the first blade 11 in the radial direction, and the tenth section 40 is located at the outer edge of the first blade 11 in the radial direction. As shown in fig. 6, the projections of the sixth to tenth cross-sections 46 to 40 on the second plane 36 are a sixth projection 56, a seventh projection 57, an eighth projection 58, a ninth projection 59, and a tenth projection 50, respectively, and the end points of the sixth to tenth projections 56 to 50 on the air intake side of the first impeller 1 are gradually shifted from inside to outside in the radial direction of the first impeller 1 toward the air outlet side. A second connecting line 34 is formed between two end points of an edge line of one end of the first blade 11 away from the rotation axis, a radial direction on the first impeller 1 perpendicular to the second connecting line 34 is a second radial direction 35, and a second plane 36 is a projection plane perpendicular to the second radial direction 35. The seventh cross-section 47 is located 20% in the direction from the sixth cross-section 46 to the tenth cross-section 40 of the first blade 11, and the ninth cross-section 49 is located in the region from 60% to 80% in the direction from the sixth cross-section 46 to the tenth cross-section 40 of the first blade 11. As shown in fig. 6, a third distance H3 exists in the axial direction between the end point of the seventh projection 57 on the air inlet side and the end point of the sixth projection 56 on the air inlet side, a fourth distance H4 exists in the axial direction between the end point of the tenth projection 50 on the air inlet side and the end point of the ninth projection 59 on the air inlet side, and the ratio of the fourth distance H4 to the third distance H3 ranges from 1.0 to 2.5.

It should be noted that, in this embodiment, the edge line of the first blade 11 on the air outlet side of the first impeller 1 may be gradually inclined from inside to outside to the air inlet side of the first impeller 1 along the radial direction of the first impeller 1, and may also play a role in reducing noise. Further, the number of the first blades 11 of the first impeller 1 may also be equal to or greater than the number of the second blades 21 of the second impeller 2.

Example eight

The embodiment provides an outdoor unit of an air conditioner, which comprises a shell, a heat exchanger and any one of the air supply fans in the first embodiment to the seventh 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. Wherein, the casing is provided with a heat dissipation grid or a heat dissipation hole, so that the airflow can be discharged out of the casing 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 seventh embodiments, which are not described herein again.

Example nine

The present embodiment provides an air conditioner, including an indoor unit and the outdoor unit of the above-mentioned embodiment eight, where the indoor unit is connected to the outdoor unit of the air conditioner, so as to realize the regulation of indoor air through the refrigerant circulation between the indoor unit and the outdoor unit of the air conditioner. 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 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 eighth embodiment, which are not described herein again.

The technical scheme of the invention is explained in detail by combining the drawings, and the structure of the first blade and/or the second blade in the air supply fan is changed, so that the difference of the pneumatic characteristics of the airflow formed by the first impeller and the airflow generated by the second impeller is generated, the mutual interference between the first impeller and the second impeller is reduced, the pressure fluctuation is reduced, and the noise of the air supply fan during operation is reduced.

In the present invention, the terms "first", "second", and "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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

In the description herein, 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 (13)

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 is arranged on the air outlet side of the first impeller and is coaxial with the first impeller, the rotation direction of the second impeller is opposite to that of the first impeller,

the edge line of the second blade on the air inlet side of the second impeller gradually inclines towards the air outlet side of the second impeller from inside to outside along the radial direction of the second impeller; and/or

The edge line of the first blade on the air inlet side of the first impeller gradually inclines towards the air inlet side of the first impeller from inside to outside along the radial direction of the first impeller.

2. The blower of claim 1,

the second blade forms a plurality of sections on a plurality of concentric circular surfaces which take the rotation axis of the second impeller as a central line, the projection of the plurality of sections on the first plane is at the end point of the air inlet side of the second impeller and gradually deviates to the air outlet side direction from inside to outside along the radial direction of the second impeller,

a first connecting line is formed between two end points of an edge line of one end, far away from the rotating axis, of the second blade, the radial ray direction perpendicular to the first connecting line is a first radial direction, and the first plane is a plane perpendicular to the first radial direction.

3. The blower of claim 2,

the plurality of cross sections sequentially include a first cross section, a second cross section, a third cross section, a fourth cross section, and a fifth cross section in the radial direction, the first cross section is located at an inner edge of the second blade in the radial direction, the fifth cross section is located at an outer edge of the second blade in the radial direction,

the projection of the first cross section to the fifth cross section on the first plane is at the end point of the air inlet side of the second impeller, and the end point gradually deviates to the air outlet side from inside to outside along the radial direction of the second impeller.

4. The blower of claim 3,

the second cross section is located in a region of 15% to 25% of the second blade in a direction from the first cross section to the fifth cross section;

the fourth cross-section is located within an area of 55% to 85% of the second blade in a direction from the first cross-section to the fifth cross-section.

5. The blower of claim 4,

the axial distance between the end point of the first section on the air inlet side and the end point of the second section on the air inlet side is a first distance;

the axial distance between the end point of the fourth section on the air inlet side and the end point of the fifth section on the air inlet side is a second distance,

wherein a ratio of the second distance to the first distance is in a ratio range of 0.8 to 2.8.

6. The blower of claim 1,

the first blade forms a plurality of sections on a plurality of concentric circular surfaces which take the rotation axis of the first impeller as a central line, the projection of the plurality of sections on a second plane is at the end point of the air inlet side of the first impeller, and the first blade gradually deviates to the air inlet side direction from inside to outside along the radial direction of the first impeller,

a second connecting line is formed between two endpoints of an edge line of one end of the first blade, which is far away from the rotating axis, the radial ray direction perpendicular to the second connecting line is a second radial direction, and the second plane is a plane perpendicular to the second radial direction.

7. The blower of claim 6,

the plurality of cross sections include a sixth cross section, a seventh cross section, an eighth cross section, a ninth cross section, and a tenth cross section in this order in the radial direction, the sixth cross section being located at an inner edge of the first blade in the radial direction, the tenth cross section being located at an outer edge of the first blade in the radial direction,

the projection of the sixth cross section to the tenth cross section on the second plane is offset from the radial direction of the first impeller from inside to outside to the direction of the air inlet side gradually at the end point of the air inlet side of the first impeller.

8. The blower of claim 7,

the seventh cross section is located in an area of 15% to 25% of the first blade in a direction from the sixth cross section to the tenth cross section,

the ninth cross-section is located in an area of 55% to 85% of the first blade in a direction from the sixth cross-section to the tenth cross-section.

9. The blower of claim 8,

the axial distance between the end point of the sixth section on the air inlet side and the end point of the seventh section on the air inlet side is a third distance;

the axial distance between the end point of the ninth section on the air inlet side and the end point of the tenth section on the air inlet side is a fourth distance,

wherein a ratio of the fourth distance to the third distance is in a ratio range of 0.8 to 2.8.

10. The blower of any one of claims 1 to 9,

the number of first blades in the first impeller is greater than or less than the number of second blades in the second impeller.

11. 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.

12. 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 1-11, disposed in the housing in correspondence with the heat exchanger.

13. An air conditioner, comprising:

an indoor unit;

the outdoor unit of claim 12, connected to the indoor unit.

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