CN113048580A - Outdoor machine of air conditioner - Google Patents

Abstract

The present invention provides an outdoor unit of an air conditioner, comprising: the motor is provided with a first output shaft and a second output shaft; the first-stage fan blades are connected with the first output shaft; the second-stage fan blades are connected with the second output shaft; the motor is configured to drive the first-stage fan blade and the second-stage fan blade to rotate, and the rotation directions of the first-stage fan blade and the second-stage fan blade are opposite; the motor is positioned between the first-stage fan blade and the second-stage fan blade; or the motor is positioned on the same side of the first-stage fan blade and the second-stage fan blade. According to the outdoor unit provided by the invention, the motor, the first-stage fan blades and the second-stage fan blades are arranged, so that the motor drives the first-stage fan blades to rotate through the first output shaft, the second-stage fan blades are driven to rotate reversely through the second output shaft, and higher wind pressure is realized by recovering the rotation energy of airflow.

Description

Outdoor machine of air conditioner

Technical Field

The invention relates to the technical field of air conditioning equipment, in particular to an air conditioner outdoor unit.

Background

In the prior art, a single axial flow air supply technology is adopted at the upper part of an outdoor unit of a central air conditioner, and airflow is collected by an air guide ring, enters a single axial flow fan and is supplied from the upper surface of the outdoor unit. The technology has the defects of small pressure rise of the single axial flow fan and unsmooth backflow and air supply when the wind resistance is large.

Disclosure of Invention

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

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

In view of the above, an object of the present invention is to provide an outdoor unit of an air conditioner, comprising: the motor is provided with a first output shaft and a second output shaft; the first-stage fan blades are connected with the first output shaft; the second-stage fan blades are connected with the second output shaft; the fan comprises a shell, wherein the shell is provided with an outlet, a first-stage fan blade and a second-stage fan blade are positioned at the outlet, the first-stage fan blade is an upstream fan blade, and the second-stage fan blade is a downstream fan blade; the motor bracket is connected with the shell, and the motor is arranged on the motor bracket; the motor is configured to drive the first-stage fan blade and the second-stage fan blade to rotate, and the rotation directions of the first-stage fan blade and the second-stage fan blade are opposite; the motor is positioned between the first-stage fan blade and the second-stage fan blade; or the motor is positioned on the same side of the first-stage fan blade and the second-stage fan blade.

The air conditioner outdoor unit provided by the invention has the advantages that through the arrangement of the motor, the first-stage fan blades, the second-stage fan blades and the motor support, the motor drives the first-stage fan blades to rotate through the first output shaft, and drives the second-stage fan blades to rotate reversely through the second output shaft, so that the counter-rotating fan is formed; further, to the cyclone setting in the exit of casing, regard first order flabellum as the upper reaches flabellum, the second level flabellum as the low reaches flabellum, through the disrotatory work of upper reaches flabellum and low reaches flabellum, improved wind pressure, anti-wind resistance ability, make the air supply more smooth and easy, reduced the probability that the backward flow appears.

Specifically, the same motor is provided with the first output shaft and the second output shaft, so that two output shafts are directly driven by one motor, the structure of the motor is compact, and the space is saved. The first-stage fan blades and the second-stage fan blades are respectively connected with the first output shaft and the second output shaft, so that the motor can simultaneously drive the first-stage fan blades and the second-stage fan blades through the first output shaft and the second output shaft respectively. Through making first order flabellum and second level flabellum counter-rotating each other, adopt the disrotatory formula design of two-stage flabellum promptly, make the motor acting capacity reinforcing, make the rotational speed of first order flabellum and second level flabellum simultaneously showing and be less than the single axial fan of same rank, increased life to the high strength requirement of high rotational speed to the flabellum structure has been reduced. The arrangement makes the air flow realize acceleration and pressurization under the combined action of the two stages of fan blades when passing through the outdoor unit, thereby enhancing the wind power, improving the wind resistance and further greatly enhancing the air exhaust capability of the air flow through the external exhaust pipe.

Specifically, in one embodiment, the motor is arranged between the first-stage fan blade and the second-stage fan blade, and the first-stage fan blade and the second-stage fan blade are distributed on two sides of the motor; in one embodiment, the motor is arranged at the same side of the first-stage fan blade and the second-stage fan blade, namely the first-stage fan blade and the second-stage fan blade are both positioned at the same side of the motor; the requirements of different working conditions can be met through different mounting modes, and the relative positions of the motor and the two stages of fan blades can be adjusted according to the size of the inner space of the outdoor unit under the condition that the use performance is not influenced, so that reasonable structural layout is ensured. Further, the motor support is used for supporting and fixing the motor, and the motor is ensured to run safely and stably. Make motor support and casing be connected according to actual conditions, guaranteed the rational layout of structure.

In addition, because the rotation direction of the first-stage fan blades is opposite to that of the second-stage fan blades, the torque acting on the rotating shaft is relatively balanced, the vibration of the machine body and the noise caused by the vibration are reduced, and the use experience of a user is further improved.

In addition, the outdoor unit of the air conditioner in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, further, the rotation axis of the first output shaft and the rotation axis of the second output shaft are collinear.

In this technical scheme, first output shaft and second output shaft have same axis of rotation, have realized the series arrangement of first order flabellum and second level flabellum for the air current is through the back with higher speed of first order flabellum, is carried out the pressure boost by the second level flabellum again, makes the wind pressure higher, and the anti-wind resistance can the reinforce.

In any of the above technical solutions, further, the first output shaft is a hollow shaft; the second output shaft passes through the hollow shaft.

In the technical scheme, the first output shaft is the hollow shaft, and the second output shaft penetrates through the hollow shaft, so that the structure is more compact, and the first output shaft and the second output shaft can have different rotating speeds and steering directions.

In any of the above technical solutions, further, a rotation speed ratio of the second output shaft to the first output shaft ranges from 0.5 to 2.

In the technical scheme, the rotating speed ratio of the second output shaft to the first output shaft is limited to be 0.5-2, so that the first-stage fan blades and the second-stage fan blades have different rotating speeds respectively, the state of air flow passing is changed, and the purposes of increasing air pressure and enhancing wind power are further achieved.

In any of the above technical solutions, further, the outdoor unit of an air conditioner further includes: the air guide ring is arranged at the outlet, and the first-stage fan blade and the second-stage fan blade are positioned in the air guide ring.

In the technical scheme, the outlet of the shell is provided with the air guide ring, the first-stage fan blade and the second-stage fan blade are arranged in the air guide ring, and air pressure is increased through the action of the two-stage fan blades when air flow passes through the air guide ring and then reaches the outlet.

In any one of the above technical solutions, further, the air guide ring includes: one end of the air ring main body forms an air outlet end; the contraction part is connected with the other end of the wind ring main body, and a transition arc is formed between the contraction part and the wind ring main body; the circle center of the transition arc is positioned outside the air guide ring.

In the technical scheme, the wind guide ring comprises a wind ring main body and a contraction part. One end of the wind ring main body is provided with an air outlet end used for air outlet, and the second-stage fan blade is arranged on one side, close to the air outlet end, of the wind ring main body as a downstream fan blade. A transition arc is formed between the contraction part and the air ring main body, and the circle center of the transition arc of the contraction part is arranged outside the air guide ring, so that the air inlet end of the air guide ring is expanded outwards, and the collection and the introduction of air flow are facilitated. Further, the air ring main body is in a straight cylinder shape. Further, the air guide ring is arranged at an outlet of the shell and can be connected with the outlet of the shell through the air guide ring main body, so that the contraction part is positioned in the shell and also can be connected with the outlet of the shell through the contraction part, the inlet end of the contraction part is positioned in the shell, and the specific installation mode can be designed according to the model of the whole air conditioner outdoor unit so as to adapt to more service environments.

In any of the above technical solutions, further, along the axial direction of the output shaft, 10% to 90% of the height of the first stage blades is located in the wind ring main body.

In this technical scheme, 10% to 90% of the height of the first stage flabellum is located in the wind circle main body means that, along the direction perpendicular to the axis, the first stage flabellum and the wind circle main body are both projected onto the rotation axis thereof, and 10% to 90% of the projection height of the first stage flabellum on the rotation axis is located in the projection of the wind circle main body. The main body of the wind ring can at least cover a small part of the height of the first-stage fan blades opposite to the main body of the wind ring, and the minimum requirement on the air supply efficiency is met; or the air ring main body can cover most of the height of the first-stage fan blades relative to the air ring main body, so that the air supply efficiency is ensured to reach the highest value. The second-stage fan blades are positioned in the wind ring main body, and the wind guide ring is ensured to completely cover the second-stage fan blades so as to improve the effect of flow guide.

In any of the above technical solutions, further, the direction perpendicular to the rotation axis of the first stage fan blade is taken as the radial direction of the first stage fan blade, and along the radial direction of the first stage fan blade, the distance from the blade tip of the first stage fan blade to the axis of the first stage fan blade is L1; the corresponding radius of the transition arc ranges from 0.01 xl 1 to 2 xl 1.

In the technical scheme, the value range of the corresponding radius of the transition arc is limited to be 0.01 × L1 to 2 × L1. The upper limit of the value of the air guide ring ensures that the air supply efficiency cannot be reduced due to overlarge radius of the contraction part of the air guide ring, and the lower limit of the value of the air guide ring ensures that the contraction part of the air guide ring keeps an outward expanded shape in the minimum state, so that the collection and the introduction of air flow are facilitated.

In any of the above technical solutions, further, the direction perpendicular to the rotation axis of the first stage fan blade is taken as the radial direction of the first stage fan blade, and along the radial direction of the first stage fan blade, the distance from the blade tip of the first stage fan blade to the axis of the first stage fan blade is L1; taking the rotation direction perpendicular to the second-stage fan blade as the radial direction of the second-stage fan blade, wherein the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade; the axial distance between the first-stage fan blade and the motor support ranges from 5mm to 2 xL 1; or the axial distance between the second-stage fan blade and the motor support ranges from 5mm to 2 xL 2.

In the technical scheme, the direction perpendicular to the rotation axis of the first-stage fan blade is taken as the radial direction of the first-stage fan blade, and the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade is L1 along the radial direction of the first-stage fan blade; the rotation direction perpendicular to the second-stage fan blade is taken as the radial direction of the second-stage fan blade, and the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade. Therefore, the value range of the axial distance between the first-stage fan blade or the second-stage fan blade and the motor support is set, and the lower limit of the value of the axial distance ensures that the fan blade and the motor support have enough space, so that the fan blade and the motor support are prevented from interfering; the upper limit of the value of the motor shaft limits the length of the motor shaft, and the motor shaft is prevented from being eccentric due to too long extension.

In any of the above technical solutions, further, the direction perpendicular to the rotation axis of the first stage fan blade is taken as the radial direction of the first stage fan blade, and along the radial direction of the first stage fan blade, the distance from the blade tip of the first stage fan blade to the axis of the first stage fan blade is L1; taking the rotation direction perpendicular to the second-stage fan blade as the radial direction of the second-stage fan blade, wherein the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade; the distance between the blade tip of the first-stage fan blade and the air guide ring ranges from 0.01 xL 1 to 0.1 xL 1 along the radial direction of the first-stage fan blade; and/or the distance from the blade tip of the second-stage fan blade to the air guide ring along the radial direction of the second-stage fan blade ranges from 0.01 xL 2 to 0.1 xL 2.

In the technical scheme, the direction perpendicular to the rotation axis of the first-stage fan blade is taken as the radial direction of the first-stage fan blade, and the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade is L1 along the radial direction of the first-stage fan blade; the rotation direction perpendicular to the second-stage fan blade is taken as the radial direction of the second-stage fan blade, and the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade. Thus, the distance from the blade tip of the first-stage fan blade to the air guide ring along the radial direction of the first-stage fan blade is set to be in a value range of 0.01 xL 1-0.1 xL 1; and/or the distance from the blade tip of the second-stage fan blade to the air guide ring along the radial direction of the second-stage fan blade ranges from 0.01 xL 2 to 0.1 xL 2. The lower value limit ensures that the interference between the fan blades and the air guide ring caused by too close distance is avoided, and the upper value limit ensures that the efficiency reduction of the fan caused by too far distance is avoided.

In any one of the above technical solutions, further, the air guide ring further includes: the expansion part is connected with the other end of the air ring main body.

In the technical scheme, the air outlet end of the air guide ring is provided with the expansion part extending to the outside of the air guide ring, so that air flow can be expanded outwards when passing through the air outlet end, the air speed is further reduced, the resistance is reduced, the energy loss is reduced, the dynamic pressure can be conveniently recovered, and the air supply efficiency is improved.

In any of the above technical solutions, the outdoor unit of the air conditioner further includes a mesh enclosure, and the mesh enclosure is disposed at an air outlet end of the air guiding ring.

In the technical scheme, the mesh enclosure is arranged at the air outlet end of the air guide ring, so that on one hand, the abnormal operation of the fan caused by the fact that external sundries enter the air guide ring is prevented, and the parts in the air guide ring are effectively protected from being damaged; on the other hand, the danger caused by the fact that people or other animals touch the fan when the air conditioner outdoor unit works is avoided, and the safety of the air conditioner outdoor unit is improved.

In any of the above technical solutions, further, the outdoor unit of an air conditioner further includes: the heat exchanger is arranged in the shell and is positioned between the air inlet and the outlet of the shell; the electric control assembly is arranged on the shell.

In the technical scheme, the heat exchanger is positioned between the air inlet and the outlet of the shell, and the side wall of the shell is correspondingly provided with the heat exchanger, so that air flow can enter the outdoor unit through the heat exchanger from multiple directions, and the air supply efficiency is improved. The electric control assembly is arranged on the shell, and at least part of the electric control assembly is positioned in the shell, so that the inner space is saved on the premise that the electric control function is not influenced, and meanwhile, the electric control assembly is protected and prevented from being damaged.

In any of the above technical solutions, further, in the axial direction of the output shaft, a distance between the electric control assembly and the motor bracket is greater than 0.02 × L1.

In this technical scheme, set for along the axis direction of output shaft, the distance between automatically controlled subassembly and the motor support is greater than 0.02 xL 1 to avoid causing the air supply efficiency to reduce because of hindering the air current, influence the working property and the work efficiency to the cyclone.

In any of the above technical solutions, further, the outdoor unit further includes: and the third-stage fan blade is arranged on the air guide ring and is positioned at the air outlet end of the air guide ring.

In the technical scheme, the third-stage fan blades are fixed in the air guide wind ring and are close to the air outlet end, so that the flow direction of air flow is changed when the air flow passes through the third-stage fan blades, and the air supply efficiency is further improved.

In any of the above technical solutions, further, the direction perpendicular to the rotation axis of the first stage fan blade is taken as the radial direction of the first stage fan blade, and along the radial direction of the first stage fan blade, the distance from the blade tip of the first stage fan blade to the axis of the first stage fan blade is L1; taking the rotation direction perpendicular to the second-stage fan blade as the radial direction of the second-stage fan blade, wherein the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade; the axial distance between the first-stage fan blades and the second-stage fan blades ranges from 0.02 xL 1 to 2 xL 1; or the axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02 xL 2 to 2 xL 2.

In the technical scheme, the distance from the blade tip of the first-stage blade to the axis of the first-stage blade is L1 along the radial direction of the first-stage blade; in the radial direction of the second stage fan blade, the distance from the blade tip of the second stage fan blade to the axis of the second stage fan blade is L2. The axial distance between the first-stage fan blades and the second-stage fan blades is further set to be in a range of 0.02 xL 1-2 xL 1; or the axial distance between the first-stage fan blade and the second-stage fan blade ranges from 0.02 xL 2 to 2 xL 2. The axial direction of the two-stage fan blades has enough space, so that the two-stage fan blades are prevented from interfering; meanwhile, the performance reduction caused by overlarge axial distance of the two stages of fan blades and other structural problems caused by the performance reduction are avoided.

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 is a schematic structural view of an outdoor unit of an air conditioner (without a mesh enclosure) according to an embodiment of the present invention, in which a straight arrow indicates an airflow direction;

FIG. 2 is a top view of FIG. 1 (with the mesh enclosure);

FIG. 3 is a top view of FIG. 1 (without the mesh enclosure);

FIG. 4 is a schematic perspective view of FIG. 1 (without the mesh enclosure);

FIG. 5 is a schematic sectional view of a portion of the structure taken along line A-A in FIG. 2;

FIG. 6 is a schematic sectional view of a portion of the structure in the direction B-B in FIG. 2;

fig. 7 is a schematic structural view of a motor of the outdoor unit of the air conditioner shown in fig. 1;

fig. 8 is a schematic view of the structure of a counter-rotating fan of the outdoor unit of the air conditioner shown in fig. 1, in which arrows indicate the direction of air flow.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 8 is:

1 outdoor unit of air conditioner, 100 motor, 102 first output shaft, 104 second output shaft, 200 first stage fan blade, 300 second stage fan blade, 400 wind guide ring, 412 wind ring main body, 414 contraction part, 416 expansion part, 500 motor support, 600 shell, 700 heat exchanger, 800 electric control component, 900 screen panel.

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.

An outdoor unit 1 of an air conditioner according to some embodiments of the present invention will be described with reference to fig. 1 to 8.

Example one

As shown in fig. 1, an embodiment of a first aspect of the present invention provides an outdoor unit 1 of an air conditioner, including: motor 100, first stage fan blade 200, second stage fan blade 300, housing 600 and motor support 500.

Wherein the motor 100 is provided with a first output shaft 102 and a second output shaft 104; the first stage fan blades 200 are connected with the first output shaft 102; the second stage fan blades 300 are connected with the second output shaft 104; the casing 600 is provided with an outlet, the first-stage fan blades 200 and the second-stage fan blades 300 are positioned at the outlet, the first-stage fan blades 200 are upstream fan blades, and the second-stage fan blades 300 are downstream fan blades; the motor bracket 500 is connected with the housing 600, and the motor 100 is arranged on the motor bracket 500; motor 100 is configured to drive rotation of first stage blade 200 and second stage blade 300, with first stage blade 200 rotating in the opposite direction as second stage blade 300.

The air conditioner outdoor unit 1 provided by the invention has the advantages that the motor 100, the first-stage fan blades 200, the second-stage fan blades 300 and the motor support 500 are arranged, so that the motor 100 drives the first-stage fan blades 200 to rotate through the first output shaft 102, and drives the second-stage fan blades 300 to rotate reversely through the second output shaft 104 to form a counter-rotating fan; further, the counter-rotating fan is arranged at the outlet of the casing 600, the first stage fan blades 200 are used as upstream fan blades, the second stage fan blades 300 are used as downstream fan blades, and larger wind pressure is realized by recovering the rotational energy of the airflow through the counter-rotating work of the upstream fan blades and the downstream fan blades.

Specifically, the arrangement of the first output shaft 102 and the second output shaft 104 in the same motor 100 realizes that two output shafts are directly driven by one motor 100, and makes the motor 100 compact and space-saving. The first stage fan blade 200 and the second stage fan blade 300 are respectively connected with the first output shaft 102 and the second output shaft 104, so that the motor 100 can simultaneously drive the first stage fan blade 200 and the second stage fan blade 300 through the first output shaft 102 and the second output shaft 104. By making the first-stage fan blade 200 and the second-stage fan blade 300 rotate in opposite directions, i.e. by adopting the counter-rotating design of two-stage fan blades, the work capacity of the motor 100 is enhanced, and meanwhile, the rotating speeds of the first-stage fan blade 200 and the second-stage fan blade 300 are obviously lower than those of single axial fans in the same level, so that the service life is prolonged, and the requirement of high rotating speed on the high strength of the fan blade structure is reduced. Through the arrangement, the air flow is pressurized under the combined action of the two stages of fan blades when passing through the air conditioner outdoor unit 1, so that the air pressure is enhanced, the wind resistance is improved, and the air exhaust capacity of the air flow passing through the external exhaust pipe is greatly enhanced.

In addition, because the rotation directions of first-stage flabellum 200 and second-stage flabellum 300 are opposite, make the moment of torsion of acting on the pivot balanced relatively, reduced the vibration of fuselage and the noise that arouses by the vibration, and then promote user's use and experience.

Further, one embodiment is shown in fig. 8, where motor 100 is disposed on the same side of first stage blade 200 and second stage blade 300, i.e., both first stage blade and second stage blade are on the same side of the motor. And may provide different rotational speeds and rotational directions for the first output shaft 102 and the second output shaft 104. Specifically, the second output shaft 104 may be a hollow shaft or a solid shaft. Specifically, the motor may be located at an air inlet end or an air outlet end of the counter-rotating fan.

Further, the motor may be disposed between the first stage fan blade 200 and the second stage fan blade 300, and the first stage fan blade 200 and the second stage fan blade 300 are disposed on two sides of the motor 100 (not shown).

The requirements of different working conditions can be met through different installation modes, and the relative positions of the motor 100 and the two stages of fan blades can be adjusted according to the size of the inner space of the outdoor unit 1 of the air conditioner under the condition that the use performance is not influenced, so that reasonable structural layout is ensured.

Further, as shown in fig. 1 and 8, the motor bracket 500 is coupled to the housing 600, and the motor 100 is disposed on the motor bracket 500. The motor bracket 500 serves to support and fix the motor 100 such that the motor 100 safely and stably operates. The motor bracket 500 is connected with the housing 600 according to actual conditions, so that the overall structure is reasonable in layout.

Specifically, both ends of the motor bracket 500 are fixedly connected with the housing, and further, both ends of the motor bracket 500 are provided with mounting holes and are fixed on the housing by screws.

Example two

As shown in fig. 1 and 5 to 8, an embodiment of the present invention provides an outdoor unit 1 of an air conditioner, including: motor 100, first stage fan blades 200 and second stage fan blades 300, housing 600 and motor bracket 500.

Wherein the motor 100 is provided with a first output shaft 102 and a second output shaft 104; the first stage fan blades 200 are connected with the first output shaft 102; the second stage fan blades 300 are connected with the second output shaft 104; motor 100 is configured to drive rotation of first stage blade 200 and second stage blade 300, with first stage blade 200 rotating in the opposite direction as second stage blade 300.

Further, the rotation axis of the first output shaft 102 and the rotation axis of the second output shaft 104 are collinear, and the series arrangement of the first-stage fan blades 200 and the second-stage fan blades 300 is realized, so that the air flow is accelerated by the first-stage fan blades 200 and then is pressurized by the second-stage fan blades 300, the air pressure is higher, and the wind resistance is strong.

Specifically, one embodiment is shown in fig. 8, where motor 100 is disposed on the same side of first stage blade 200 and second stage blade 300, i.e., both first stage blade and second stage blade are on the same side of the motor. In the embodiment shown in fig. 7, the first output shaft 102 is a hollow shaft; the second output shaft 104 is inserted into the hollow shaft, so that the structure is more compact, and the first output shaft 102 and the second output shaft 104 can have different rotating speeds and steering directions. Specifically, the second output shaft 104 may be a hollow shaft or a solid shaft.

Specifically, the motor may be disposed between the first stage fan blade 200 and the second stage fan blade 300, and the first stage fan blade 200 and the second stage fan blade 300 are disposed on two sides of the motor 100 (not shown).

The requirements of different working conditions can be met through different installation modes, and the relative positions of the motor 100 and the two stages of fan blades can be adjusted according to the size of the inner space of the outdoor unit 1 of the air conditioner under the condition that the use performance is not influenced, so that reasonable structural layout is ensured.

Furthermore, the ratio of the rotation speed of the second output shaft 104 to the rotation speed of the first output shaft 102 is limited to 0.5 to 2, so that the first stage fan blades 200 and the second stage fan blades 300 have different rotation speeds, the state of air flow passing is changed, and the purpose of increasing the air pressure is achieved.

Further, as shown in fig. 4, the direction perpendicular to the rotation axis of first stage blade 200 is set as the radial direction of first stage blade 200, and the distance from the tip of first stage blade 200 to the axis of first stage blade 200 along the radial direction of first stage blade 200 is set to L1.

The direction perpendicular to the rotation axis of the second stage blade 300 is set as the radial direction of the second stage blade 300, and the distance from the tip of the second stage blade 300 to the axis of the second stage blade 300 along the radial direction of the second stage blade 300 is set to L2.

Specifically, a distance L1 between the tip of first stage blade 200 and the axis of first stage blade 200 along the radial direction of first stage blade 200 means that first stage blade 200 is projected along the axial direction of first stage blade 200, and radius R corresponding to a circle of the maximum radius formed in the projected outline of first stage blade 200 is distance L1 between the tip of first stage blade 200 and the axis of first stage blade 200.

Specifically, the distance L2 between the tip of the second stage blade 300 and the axis of the second stage blade 300 along the radial direction of the second stage blade 300 means that the second stage blade 300 is projected along the axial direction of the second stage blade 300, and the radius R corresponding to the circle with the largest radius formed in the projected outline of the second stage blade 300 is the distance L2 between the tip of the second stage blade 300 and the axis of the second stage blade 300.

Specifically, as shown in fig. 3, a distance L1 from the tip of the first stage blade 200 to the axis of the first stage blade 200 may be equal to a distance L2 from the tip of the second stage blade 300 to the axis of the second stage blade 300, so as to reduce the production mold and the production cost.

Therefore, the axial distance between the first stage fan blade 200 and the second stage fan blade 300 is set to be in the range of 0.02 × L1 to 2 × L1; or the axial distance between the first stage fan blade 200 and the second stage fan blade 300 is in the range of 0.02 × L2 to 2 × L2. As shown in fig. 5, along the air intake direction of the airflow, the first blade includes a leading edge and a trailing edge, the second blade includes a leading edge and a trailing edge, and an axial distance L3 between the first blade 200 and the second blade 300 is a distance between the trailing edge of the first blade 200 and the leading edge of the second blade 300. Due to the reasonable arrangement of the axial distance, the axial direction of the two-stage fan blades has enough space, the possible interference of the two-stage fan blades is avoided, and the performance reduction and other structural problems caused by the performance reduction possibly caused by the overlarge axial distance of the two-stage fan blades are avoided.

Further, the axial distance between the first stage fan blade 200 and the second stage fan blade 300 is set to be in a range of 0.05 × L1 to 0.3 × L1; or the axial distance between the first stage fan blade 200 and the second stage fan blade 300 is in the range of 0.05 × L2 to 0.3 × L2.

EXAMPLE III

As shown in fig. 1 to 4, in any of the above embodiments, the outdoor unit 1 further includes: wind-guiding circle 400.

The air guiding ring 400 is disposed at the outlet of the casing 600, and the first stage fan blade 200 and the second stage fan blade 300 are disposed in the air guiding ring 400.

In this embodiment, the casing 600 serves to protect the internal structure of the outdoor unit 1 from external force. The outlet of the casing 600 is provided with an air guiding ring 400, and the first-stage fan blade 200 and the second-stage fan blade 300 are arranged in the air guiding ring 400, so that the air flow passes through the air guiding ring 400, and the air pressure is increased under the action of the two stages of fan blades and then reaches the outlet.

Specifically, the projection is performed on the rotating axis along the direction perpendicular to the rotating axis of the first-stage fan blade, the projection of the second-stage fan blade is completely positioned in the projection of the air guide ring, and at least part of the projection of the first-stage fan blade falls into the air guide ring.

Further, wind-guiding collar 400 includes a collar body 412 and a constriction 414. Specifically, as shown in fig. 6, an air outlet end is formed at one end of the wind ring main body 412, and the second stage blades 300 are disposed on one side of the wind ring main body 412 near the air outlet end as downstream blades. The constricted portion 414 is connected to the other end of the windband main body 412 and forms a transition arc with the windband main body 412 to make the air flow smoothly transition.

Further, the vane main body 412 is a straight cylinder.

Further, the air guiding ring 400 is disposed at the outlet of the casing 600, and may be connected to the outlet of the casing 600 through the air guiding ring main body 412, so that the contraction portion 414 is located in the casing 600, and may also be connected to the outlet of the casing 600 through the contraction portion 414, and the inlet end of the contraction portion 414 is located in the casing 600, and the specific installation manner may be designed according to the model of the whole outdoor unit 1 of the air conditioner, so as to adapt to more use environments.

Further, along the axial direction of the output shaft, 10% to 90% of the height of the first stage fan blades 200 is located in the windband main body 412. Specifically, the 10% to 90% of the height of first stage fan blade 200 is located in wind ring main body 412, that is, along the direction perpendicular to the axis, first stage fan blade 200 and wind ring main body 412 are both projected onto the rotation axis thereof, and 10% to 90% of the height of first stage fan blade 200 projected onto the rotation axis is located in the projection of wind ring main body 412, so that when the internal space is limited, wind ring main body 412 can at least cover the small height of first stage fan blade 200 opposite thereto, and the minimum requirement for the air supply efficiency is met, or when the internal space is not limited, wind ring main body 412 can cover the large height of first stage fan blade 200 opposite thereto, and the air supply efficiency is ensured to be higher.

Specifically, the height of first stage blade 200 refers to the projection length of first stage blade 200 on its rotation axis along the radial direction of first stage blade 200.

Further, as shown in fig. 5, the center of the transition arc of the contraction portion 414 is disposed outside the air guiding ring 400, so that the air inlet end of the air guiding ring 400 is expanded outward, which is beneficial to collecting and guiding in the air flow.

Further, the corresponding radius defining the transition arc has a value ranging from 0.01 × L1 to 2 × L1, so that the contraction portion 414 of the wind guiding ring 400 maintains an outward expanding shape to facilitate the collection and introduction of the airflow.

Further, the corresponding radius r defining the transition arc has a value in the range of 0.1 × L1 to 0.5 × L1, so as to facilitate the collection and introduction of the airflow.

Specifically, the motor bracket 500 may also be fixedly connected to the wind guide ring 400, and the motor bracket 500 is fixed to the wind guide ring by screws or bolts.

Further, the axial distance between the first-stage fan blades 200 and the motor support 500 is set to be 5mm to 2 × L1; or the axial distance between the second stage fan blade 300 and the motor bracket 500 ranges from 5mm to 2 × L2. It can be considered that the axial distance between the fan blade and the motor bracket 500 is the shortest distance between the circumference of the fan blade and the projection of the plane of the motor bracket 500 opposite to the circumference of the fan blade on the axis of the output shaft. Through setting up reasonable axial distance for flabellum and motor support 500 have sufficient interval, avoid flabellum and motor support 500 probably to take place to interfere, and limited the length of motor 100 output shaft, avoid the output shaft to stretch out the overlength and probably produce off-centre. When the motor 100 is located between the two stages of blades, the distances between the two stages of blades and the motor bracket 500 need to be respectively limited; when the motor 100 is located on the same side of the two-stage blades, the distance between the blade close to the motor 100 and the motor bracket 500 is only limited. As shown in FIG. 5, the first stage blade 200 is disposed adjacent to the motor bracket 500, and the axial distance between the first stage blade 200 and the motor bracket 500 is L4.

Further, the axial distance between the first-stage fan blades 200 and the motor bracket 500 is set to be 5mm to 0.5 × L1; or the axial distance between the second stage fan blade 300 and the motor bracket 500 ranges from 5mm to 0.5 × L2.

Specifically, the motor bracket may also be disposed at the air outlet end of the air guide ring, and is not limited to the embodiments shown in fig. 5 and 6.

Further, as shown in fig. 5, 6 and 8, along a direction perpendicular to the rotation axis of the first stage blade 200, a distance B1 between the blade tip of the first stage blade 200 and the wind-guiding ring 400 ranges from 0.01 × L1 to 0.1 × L1; and/or along the radial direction of the second-stage fan blade 300, the range of the distance B2 from the blade tip of the second-stage fan blade 300 to the air guide ring 400 is 0.01 × L2 to 0.1 × L2, and the setting of the range avoids the possibility of interference between the fan blade and the air guide ring 400 caused by too close distance and avoids the possibility of reduction of the fan efficiency caused by too far distance.

Further, the value range of the distance B1 from the blade tip of the first-stage fan blade 200 to the wind guide ring 400 is set to be 0.025 × L1 to 0.055 × L1; and/or the distance B2 from the tip of the second stage fan blade 300 to the wind guide ring 400 along the radial direction of the second stage fan blade 300 is in the range of 0.025 × L2 to 0.055 × L2.

Furthermore, the air outlet end of the air guide ring 400 is provided with an expansion part 416 extending to the outside of the air guide ring 400, so that the air flow can be expanded outwards when passing through the air outlet end, further the air speed is reduced, the resistance is reduced, the energy loss is reduced, the dynamic pressure can be recovered conveniently, and the air supply efficiency is improved.

Example four

As shown in fig. 1 and 2, in any of the above embodiments, the outdoor unit 1 further includes: the mesh enclosure 900, the mesh enclosure 900 is disposed at the air outlet end of the air guiding ring 400.

In this embodiment, the mesh enclosure 900 is disposed at the air outlet end of the air guiding ring 400, so as to prevent external impurities from entering the air guiding ring 400 to cause abnormal operation of the fan, and effectively protect the components inside the air guiding ring 400 from being damaged; on the other hand, the danger caused by the fact that people or other animals touch the fan when the air conditioner outdoor unit 1 works is avoided, and the safety of the air conditioner outdoor unit 1 is improved.

Further, as shown in fig. 1 and 4, the outdoor unit 1 further includes: a heat exchanger 700 and an electronic control assembly 800. Specifically, the heat exchanger 700 is located between the air inlet and the outlet of the casing 600, and the heat exchangers 700 are correspondingly disposed on 3 sides of the casing 600, so that air flow can enter the outdoor unit 1 of the air conditioner through the heat exchangers 700 from multiple directions, and the air supply efficiency is improved. The electronic control assembly 800 is disposed on the housing 600.

Specifically, as shown in fig. 1 and 4, the heat exchangers 700 are disposed on the front, left, and right sides of the whole air conditioner outdoor unit, and the electric control assembly 800 is disposed on the back plate, so that air can be introduced into the air conditioner outdoor unit from three sides and discharged from the air guide ring, and the working efficiency of the outdoor unit is improved.

Furthermore, the electric control assembly can be arranged at the lower part of the back plate, and the heat exchanger 700 is additionally arranged at the upper part of the back plate, so that the four-side air inlet of the outdoor unit can be realized.

Specifically, as shown in fig. 1 to 4, the air conditioner outdoor unit 1 is a side air inlet and a top air outlet, in a specific implementation, the air outlet may be further disposed on a side surface of the casing to realize the top and the other side air inlets, and the specific structure may be set according to specific conditions, but is not limited thereto.

Specifically, the electronic control assembly 800 is disposed outside the housing 600, or at least a portion thereof is disposed outside the housing 600.

Further, as shown in fig. 5 or fig. 6, the distance between the electronic control unit 800 and the motor bracket 500 along the axial direction of the output shaft is set to be greater than 0.02 × L1, so as to avoid the reduction of the air supply efficiency caused by the obstruction of the air flow.

Further, the distance between the electric control assembly 800 and the motor bracket 500 is greater than 0.1 × L1.

In the embodiment, the structure of the outdoor unit 1 is shown in fig. 1, 2 and 4. The electric control assembly 800 is installed on the back plate of the shell 600, the heat exchanger 700 is arranged on the other three surfaces, and parts such as a compressor and pipelines are installed inside the shell 600. The upper part of the casing 600 is provided with a motor bracket 500, a motor 100, an air guide ring 400, a first-stage fan blade 200, a second-stage fan blade 300, a mesh enclosure 900 and other parts to form a counter-rotating fan.

Specifically, the first stage blades 200 and the second stage blades 300 rotate in opposite directions, the first stage blades 200 are mounted on a first output shaft 102 of the motor 100, the second stage blades are mounted on a second output shaft 104 of the motor 100, and the motor 100 is fixed to the outdoor unit 1 by the motor bracket 500. The inner diameter of the wind ring main body 412 of the wind guide ring 400 is consistent from one end connected with the contraction part 414 to one end connected with the expansion part 416, so that the wind guide ring plays a role in guiding and sealing; the outlet end of the wind guide ring 400 is provided with a mesh enclosure 900.

When the counter-rotating fan is operated, the airflow enters the outdoor unit 1 through the heat exchangers 700 on three sides of the casing 600, passes through the electric control assembly 800, the motor bracket 500 and other parts, is collected by the air guide ring 400, enters the first-stage fan blades 200 and the second-stage fan blades 300, is pressurized by the two-stage fan blades, and is finally discharged out of the outdoor unit 1 through the mesh enclosure 900.

Fig. 8 is a partial structure of the outdoor unit 1 of fig. 1, and illustrates a spatial position relationship between the fan blades and the motor bracket 500. And setting the axial direction of the output shaft as the axial direction, and in the axial projection contour line of the fan blade, taking the circle corresponding to the maximum radius in the contour line corresponding to the blade tip of the fan blade as the radius of the fan blade, wherein the value is R. Thereby further setting the distance between the trailing edge of the first stage fan blade 200 and the leading edge of the second stage fan blade 300 to 0.02R to 2R. When the axial space of the whole machine is limited, the distance between the two stages of fan blades is smaller, and the distance can be larger when the space is not limited. The distance between the front edge of the first-stage fan blade 200 and the motor support 500 opposite to the front edge is the distance between the first-stage fan blade 200 and the motor support 500 in the axial direction of the output shaft, and the value range of the distance is 5mm to 2R, so that the possible interference between the fan blade and the motor support 500 is avoided, and the possibility of eccentricity caused by the overlong extension of the output shaft of the motor 100 is prevented.

Further, as shown in fig. 7, the motor 100 is provided with two shafts, the first output shaft 102 is a hollow shaft, has a short length and a large diameter, and is provided with the first stage fan blades 200; the second output shaft 104 is a solid shaft with a longer length and a smaller diameter, and is provided with second stage fan blades 300. The two output shafts rotate in opposite directions, and the rotation speeds may be different, and the ratio of the rotation speeds of the second output shaft 104 to the first output shaft 102 ranges from 0.5 to 2.

Further, with reference to the partial structure of the outdoor unit 1 of the air conditioner shown in fig. 5 and 6, the direction perpendicular to the rotation axis of the fan blades is set as the radial direction of the fan blades, and the radial distance between the outer peripheries of the two stages of fan blades and the air guide ring 400 ranges from 0.01R to 0.1R. The smaller the radial distance is, the higher the fan efficiency is, but when the radial distance is too small, the blades may interfere with the air guide ring 400.

Further, the outdoor unit 1 further includes: third stage fan blades (not shown). Specifically, the third stage fan blade is fixed inside the air guiding ring 400 and close to the air outlet end (not shown in the figure), so that the flow direction of the air flow is changed when the air flow passes through the third stage fan blade, and the air supply efficiency is further improved. Through setting up the third level flabellum on wind-guiding circle 400, realized adopting the movable blade that is greater than the two-stage, promoted work efficiency through the combination of multistage movable blade and quiet leaf, improved the air-out effect.

Further, as shown in fig. 2, 5 and 6, wind-guiding ring 400 is an asymmetric structure. The radius range of the transition arc of the air guide ring 400 is set to be 0.01R-2R, so that the reduction of air supply efficiency caused by overlarge radius is avoided, and the transition arc is kept in an outward expanded shape to facilitate the collection and introduction of air flow. The first-stage blades 200 are not completely covered by the wind guiding ring 400, the first-stage blades 200 are located at the height of the unexpanded portion 416 of the wind guiding ring 400, and the ratio of the height of the first-stage blades 200 to the height of the first-stage blades is the coverage rate, so that the coverage rate of the first-stage blades 200 ranges from 0.1 to 0.9.

The second stage fan blade 300 is completely covered by the air guide ring 400, and the outlet of the air guide ring 400 expands outwards, so that the dynamic pressure can be recovered and the efficiency can be increased. Further, the outlet of the air guide ring 400 may not be expanded.

The position of the electronic control assembly 800 may affect the airflow from the housing 600 into the counter-rotating fan, reducing the performance and efficiency of the counter-rotating fan. Therefore, the axial distance between the electric control assembly 800 and the motor bracket 500 is set to be greater than 0.1R. The smaller the vertical distance of the electronic control assembly 800 from the corresponding housing 600, the better.

The air conditioner outdoor unit 1 provided by this embodiment adopts the two-stage series design of the first stage fan blades 200 and the second stage fan blades 300, and the air flow is accelerated by the first stage fan blades 200 and then pressurized by the second stage fan blades 300, so that the air pressure is higher and the wind resistance is strong. Secondly, the counter-rotating design is adopted, the work doing capability is stronger, the rotating speed of the first-stage fan blade 200 and the second-stage fan blade 300 is obviously lower than that of a single axial flow fan, the service life is long, and the requirement on the structure can be reduced. Thirdly, the first fan blade and the second fan blade 300 have balanced torque due to the opposite rotating directions, and the vibration of the machine body is reduced. And because the rotating speed is obviously reduced, the frequency on the noise frequency spectrum and the resonant single-tone noise are greatly reduced, and the product quality is improved.

EXAMPLE five

A second aspect of the present invention provides an air conditioner, which includes the outdoor unit 1 of any of the above embodiments, so that all the advantages of the outdoor unit 1 are achieved.

In the embodiment, the present invention is not limited to the application of the outdoor unit of the central air conditioner, but can be applied to other applications of the single axial flow fan such as an air purifier.

In a specific embodiment, the central air conditioner further comprises an indoor unit, and the indoor unit is connected with the outdoor unit in any one of the embodiments to adjust the temperature and humidity of the indoor environment.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. 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, 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 present invention. In the present invention, 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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (16)

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

a motor provided with a first output shaft and a second output shaft;

the first-stage fan blades are connected with the first output shaft;

the second-stage fan blades are connected with the second output shaft;

the fan comprises a shell, wherein the shell is provided with an outlet, the first-stage fan blades and the second-stage fan blades are positioned at the outlet, the first-stage fan blades are upstream fan blades, and the second-stage fan blades are downstream fan blades;

the motor bracket is connected with the shell, and the motor is arranged on the motor bracket;

wherein the motor is configured to drive the first stage fan blade and the second stage fan blade to rotate, and the rotation directions of the first stage fan blade and the second stage fan blade are opposite; and

the motor is positioned between the first-stage fan blade and the second-stage fan blade; or

The motor is located on the same side of the first-stage fan blade and the second-stage fan blade.

2. The outdoor unit of claim 1, wherein,

the axis of rotation of the first output shaft and the axis of rotation of the second output shaft are collinear.

3. The outdoor unit of claim 1, wherein,

the first output shaft is a hollow shaft; the second output shaft passes through the hollow shaft.

4. The outdoor unit of claim 1, wherein,

the rotation speed ratio of the second output shaft to the first output shaft ranges from 0.5 to 2.

5. The outdoor unit of an air conditioner according to any one of claims 1 to 4, further comprising:

the air guide ring is arranged at the outlet, and the first-stage fan blade and the second-stage fan blade are arranged in the air guide ring.

6. The outdoor unit of claim 5, wherein the air guide ring comprises:

the air ring comprises an air ring main body, wherein an air outlet end is formed at one end of the air ring main body;

the contraction part is connected with the other end of the wind ring main body, and a transition circular arc is formed between the contraction part and the wind ring main body;

the circle center of the transition arc is located outside the air guide ring.

7. The outdoor unit of claim 6, wherein,

along the axis direction of the output shaft, 10% -90% of the height of the first-stage fan blades are located in the air ring main body.

8. The outdoor unit of claim 6, wherein,

taking the direction perpendicular to the rotation axis of the first-stage fan blade as the radial direction of the first-stage fan blade, and taking the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade as L1 along the radial direction of the first-stage fan blade;

the corresponding radius of the transition arc ranges from 0.01 × L1 to 2 × L1.

9. The outdoor unit of an air conditioner according to any one of claims 1 to 4,

taking the direction perpendicular to the rotation axis of the first-stage fan blade as the radial direction of the first-stage fan blade, and taking the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade as L1 along the radial direction of the first-stage fan blade;

taking the direction perpendicular to the rotation axis of the second-stage fan blade as the radial direction of the second-stage fan blade, wherein the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade;

the axial distance between the first-stage fan blades and the motor support ranges from 5mm to 2 xL 1; or

The axial distance between the second-stage fan blades and the motor support ranges from 5mm to 2 xL 2.

10. The outdoor unit of claim 5, wherein,

taking the direction perpendicular to the rotation axis of the first-stage fan blade as the radial direction of the first-stage fan blade, and taking the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade as L1 along the radial direction of the first-stage fan blade;

taking the rotation direction perpendicular to the second-stage fan blade as the radial direction of the second-stage fan blade, wherein the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade;

the distance from the blade tip of the first-stage fan blade to the air guide ring along the radial direction of the first-stage fan blade ranges from 0.01 xL 1 to 0.1 xL 1; and/or

And the distance from the blade tip of the second-stage fan blade to the air guide ring along the radial direction of the second-stage fan blade ranges from 0.01 xL 2 to 0.1 xL 2.

11. The outdoor unit of claim 6, wherein the air guide ring further comprises: the expansion part is connected with the air outlet end of the air ring main body.

12. The outdoor unit of claim 5, further comprising:

and the mesh enclosure is arranged at the air outlet end of the air guide ring.

13. The outdoor unit of claim 5, further comprising:

the heat exchanger is arranged in the shell and is positioned between the air inlet and the outlet of the shell;

and the electric control assembly is arranged on the shell.

14. The outdoor unit of claim 13, wherein,

taking the direction perpendicular to the rotation axis of the first-stage fan blade as the radial direction of the first-stage fan blade, and taking the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade as L1 along the radial direction of the first-stage fan blade;

and the distance between the electric control assembly and the motor bracket is greater than 0.02 multiplied by L1 along the axial direction of the output shaft.

15. The outdoor unit of claim 5, further comprising:

and the third-stage fan blade is arranged on the air guide ring and is positioned at the air outlet end of the air guide ring.

16. The outdoor unit of an air conditioner according to any one of claims 1 to 4,

taking the direction perpendicular to the rotation axis of the first-stage fan blade as the radial direction of the first-stage fan blade, and taking the distance from the blade tip of the first-stage fan blade to the axis of the first-stage fan blade as L1 along the radial direction of the first-stage fan blade;

taking the direction perpendicular to the rotation axis of the second-stage fan blade as the radial direction of the second-stage fan blade, wherein the distance from the blade tip of the second-stage fan blade to the axis of the second-stage fan blade is L2 along the radial direction of the second-stage fan blade;

the axial distance between the first-stage fan blades and the second-stage fan blades ranges from 0.02 xL 1 to 2 xL 1; or

The axial distance between the first stage fan blade and the second stage fan blade ranges from 0.02 xL 2 to 2 xL 2.

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