CN210485894U

CN210485894U - Cross-flow fan blade mechanism and air conditioner

Info

Publication number: CN210485894U
Application number: CN201921456628.7U
Authority: CN
Inventors: 蒋力; 张伟捷
Original assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Current assignee: Aux Air Conditioning Co Ltd; Ningbo Aux Electric Co Ltd
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-05-08
Anticipated expiration: 2029-09-04

Abstract

The utility model provides a through-flow fan blade mechanism and air conditioner relates to air conditioner technical field. The sections positioned at two axial ends of the cross-flow fan blade mechanism respectively form a first section and a tail section, and the ratio of the maximum camber to the chord length of the blade of the first section and/or the tail section is smaller than the ratio of the maximum camber to the chord length of the blade of the section between the first section and the tail section. Compared with the prior art, the utility model discloses the blade that utilizes at least one section in these two sections of first festival and tail section is more flat for the blade of section between first festival and the tail section to the blade that makes through-flow fan blade mechanism fully keeps the skin with the air current, thereby has avoided the wall effect to influence, and eliminates the air current and take place to flow and worsen.

Description

Cross-flow fan blade mechanism and air conditioner

Technical Field

The utility model relates to an air conditioner technical field particularly, relates to an air conditioner with through-flow fan blade mechanism.

Background

The cross-flow fan blade mechanism has the advantages of uniform air outlet and low noise level, so the cross-flow fan blade mechanism is widely applied to air conditioners, particularly indoor units of the air conditioners.

Generally, the cross-flow fan mechanism is cylindrical and is divided into a plurality of sections along the axial direction, each section is provided with a plurality of blades, the plurality of blades are arranged around the shaft of the cross-flow fan mechanism, and the cross-flow fan mechanism rotates to enable the blades of each section to rotate so as to form airflow.

However, in the rotation process of the conventional through-flow fan blade mechanism, the condition that the air flow is deteriorated to influence the normal use of the air conditioner exists, and the problem is more prominent particularly under the low-wind-speed working condition of the air conditioner.

SUMMERY OF THE UTILITY MODEL

The utility model discloses it has the air current to flow to worsen to aim at solving the through-flow fan blade mechanism of current air conditioner to a certain extent, and is more outstanding under the low wind speed operating mode of especially air conditioner, and influences at least one aspect among the normal use scheduling problem of air conditioner.

In order to solve the problem, the utility model provides a through-flow fan blade mechanism is located the festival of through-flow fan blade mechanism axial both ends department forms first festival and tail festival respectively, the first festival and/or the ratio of the biggest camber and the chord length of the blade of tail festival is less than the ratio of the biggest camber and the chord length of the blade of the festival between first festival and the tail festival.

The utility model discloses an inventor discovers, cause current through-flow fan blade mechanism at the rotation in-process, receive the wall effect influence, can make the air current take place to flow the leading cause that worsens is, the blade of first festival and tail section is with the unable effectual skin that keeps of air current, and the blade that causes first festival and tail section takes place to separate rather than the air current of contact, thereby influence the whole of through-flow fan blade mechanism and just make the air current take place to flow and worsen and influence the normal use of air conditioner, and this kind of problem is more outstanding under the condition of low wind speed.

Therefore, the utility model discloses utilize and make the blade of at least one section in these two sections of first festival and tail section flatter for the blade of the section between first festival and the tail section, just make the maximum camber f of the blade of at least one section in these two sections of first festival and tail section promptly_maxThe ratio of the maximum camber f to the chord length c of the blade being smaller than the maximum camber f of the blade in the section between the leading section and the trailing section_maxThe blade structure of at least one of the first section and the tail section is different from the blade structure of other sections, and is more flat than the blades of other sections, so that the blades of the cross-flow fan mechanism are kept close to the air flow fully, the influence of the wall effect is avoided, and the flow deterioration of the air flow is eliminated.

Further, the blade of the leading section or the trailing section includes:

the outer arc surface is positioned on the upper surface of the blade of the first section or the tail section; and

the intrados is positioned on the lower surface of the blade of the first section or the tail section;

the outer arc surface and the inner arc surface are both upwards raised, and the top of the outer arc surface is adjacent to the front edge points of the blade profiles of the first section and the tail section.

The extrados and the intrados face towards the same side to be raised or sunken, thereby the blade profile of the blade is C-shaped or similar to C-shaped structure, and for the perfusion fan blade mechanism of the air conditioner, the extrados and the intrados of the structural form are beneficial to the full contact of the air flow and the blade surface of the blade as far as possible, thereby fully ensuring the body attaching effect of the blade of the first section or the tail section and the air flow in structure. Thereby reducing the influence of wall effect and avoiding the flow deterioration of the airflow.

In general, in a profile diagram, the position of the leading edge point is the ridge line of one side edge in the length direction of the blade of the first section or the tail section; therefore, the protruding part of the cambered surface is arranged close to the front edge point of the blade profile of the blade at the first section or the tail section, so that the airflow firstly passes through the protruding part of the cambered surface in the contact process with the blade and then continuously flows along the surface of the blade behind the protruding part in an attached mode, the attaching capacity of the airflow and the blade is improved, and the airflow is guided.

Further, the maximum camber f of the profile of the blades of the leading and trailing sections_maxIs one.

Maximum camber f of profile in blade profile design_maxMay be two, e.g. with the apex of the camber being flat, or the profile being S-shaped, so that the maximum camber f is_maxAt the top of the two projections, respectively, but with a maximum curvature f_maxWhen the position of (A) is more than one, the skin effect of the air flow and the blade surface is not good at low wind speed, and the maximum camber f_maxThe convex arc surface of the blade profile can be ensured to be smooth, and the air flow has good fluidity along the surface of the blade.

Further, the maximum camber f of the profile of the blades of the leading and trailing sections_maxIs located adjacent to the mid-point of the chord lines of the blades of the leading and trailing sections.

So arranged that the point of the leading edge of the blade profile reaches the maximum camber f_maxThe distance of the top of the corresponding bulge in the position is lengthened, so that the contact distance between the airflow and the top of the bulge of the blade is lengthened under the conditions of medium wind speed and high wind speed, and the airflow and the top of the bulge have better body fitting performance.

Further, the ratio of the maximum camber to the chord length of the blades of the leading section and/or the trailing section is comprised between 3% and 15%.

Therefore, the first blade and/or the second blade can keep better fit with the airflow, the influence caused by the wall effect is further reduced, and the airflow flowing deterioration is fully eliminated.

Further, the ratio of the maximum camber to the chord length of the blade of the section between the leading section and the trailing section is comprised between 5% and 30%.

Thus, by increasing the maximum camber f of the blade between the leading and trailing sections_maxTo chord length c, enlarging "maximum of blade of leading and/or trailing sectionCamber f_maxRatio to chord length c and maximum camber f of the blade in the section between the leading and trailing sections_maxAnd the difference between the ratio of the first section to the chord length c, so that the first section, the tail section and the blades of other sections are matched more fully, the blades and the airflow keep better skin effect, the influence generated by the wall effect is further reduced, and the airflow flowing deterioration is fully eliminated.

Further, the maximum camber f of the blades of the section adjacent to the leading section or the trailing section_maxThe ratio of the chord length to the chord length is between 3% and 15%.

Thus, the maximum camber f of the blades of the sections adjacent to the first and the last section, respectively_maxThe ratio of the cross-flow fan blade to the chord length c is 3-15%, on one hand, the body-attaching effect of the blades at two axial ends (a first section and a tail section) of the cross-flow fan blade mechanism and airflow is further enhanced; on the other hand, the blade profile difference of the two axial ends of the cross-flow fan blade mechanism and the middle position is enhanced, and the air flow is fully attached to most of the blades of the cross-flow fan blade mechanism by utilizing the difference complementation.

Further, the structure of each blade of the leading section is the same as the structure of each blade of the trailing section.

By the arrangement, the body attaching effect of the blades of the first section and the tail section and the airflow is fully ensured.

Further, all the blades of the first section or the tail section are arranged at unequal intervals around the rotating shaft of the cross-flow fan blade mechanism along the circumference of the first section or the tail section.

The plurality of blades are arranged at unequal intervals around the axis of the cross-flow fan blade mechanism, so that the noise generated in the rotating process of the blades is reduced, and the use comfort is improved.

Additionally, the utility model also provides an air conditioner, the air conditioner is installed above-mentioned arbitrary one through-flow fan blade mechanism. The air conditioner is provided with the cross-flow fan blade mechanism. The corresponding technical effect achieved by the air conditioner is the same as that of the cross-flow fan blade mechanism, so the explanation is not provided.

Drawings

Fig. 1 is a schematic perspective view of the cross-flow fan blade mechanism according to the embodiment of the present invention;

FIG. 2 is a schematic side view of the blades of the leading and trailing sections of an embodiment of the present invention;

fig. 3 is a diagram of a computer simulated airflow jet analysis of a 6% maximum camber to chord length ratio of blades of the leading section and the trailing section according to an embodiment of the present invention;

fig. 4 is a diagram of a computer simulated airflow jet analysis of 9% maximum camber to chord length ratio of blades of the leading section and the trailing section according to an embodiment of the present invention;

fig. 5 is a diagram of a computer simulated airflow blowing analysis of 16% maximum camber to chord length ratio of blades of the leading section and the trailing section according to an embodiment of the present invention.

Description of reference numerals:

10-first section, 11-first blade, 20-tail section, 21-second blade, 30-section disc, 40-shaft cover, 50-end cover, 60-third blade, 71 outer arc surface, 72 inner arc surface, 73 leading edge point, 74 trailing edge point, 75 chord line midpoint, A-length direction of cross-flow fan blade mechanism, B-length direction of first blade, c-chord length, D-arc line, F-chord line, F-camber_maxMaximum camber, L-distance.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to 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 "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 1 and 2, the present embodiment provides a cross-flow fan blade mechanism, wherein the segments located at two axial ends of the cross-flow fan blade mechanism respectively form a first segment 10 and a tail segment 20, and the maximum camber f of the blades of the first segment 10 and/or the tail segment 20_maxThe ratio of which to the chord length c is smaller than the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxTo the chord length c.

It should be noted that, the through-flow fan mechanism is cylindrical, a plurality of circular segment discs 30 are sequentially arranged at intervals along the axial direction of the through-flow fan mechanism, a shaft cover 40 is installed at the front end of the axial direction of the through-flow fan mechanism, an end cover 50 is fixed at the rear end of the axial direction of the through-flow fan mechanism, the shaft cover 40 is generally circular sheet-shaped, the end cover 50 is circular sheet-shaped, and usually the shaft cover 40, the plurality of segment discs 30 and the end cover 50 are all coaxially arranged, a plurality of first blades 11 are fixed between the shaft cover 40 and the segment disc 30 adjacent to the shaft cover, and the plurality of first blades 11 are arranged at intervals around the shaft of the through-flow fan mechanism, so that the shaft cover 40 and the segment disc 30 adjacent to the shaft cover form a first segment 10, and the first blades 11 are blades of the first segment 10. In the same way, a plurality of second blades 21 are fixed between the end cover 50 and the adjacent segment disc 30, the second blades 21 are arranged at intervals around the shaft of the cross-flow fan blade mechanism, and the end cover 50 and the adjacent segment disc 30 form a tail segment 20. And the second blade 21 is the blade of the tail section 20.

And two adjacent segment discs 30 are formed into other segments except the first segment 10 and the tail segment 20, namely, the segment between the first segment 10 and the tail segment 20, and of course, a plurality of third blades 60 are fixed between the two adjacent segment discs 30, and the plurality of third blades 60 are arranged at intervals around the shaft of the through-flow fan mechanism.

Thus, the first blade 11, the second blade 21, the third blade 60, the shaft cover 40, the end cover 50 and the plurality of segment discs 30 form a structural form of the cross-flow fan blade mechanism.

In addition, the definition of the camber is required to be explained;

for all the blade structures (including the first blade 11, the second blade 21 and the third blade 60) of the cross-flow fan blade mechanism, connecting the circle centers of all inscribed circles of molded lines of the blade outline to form a mean camber line D;

the intersection of the camber line D and the front end of the profile becomes the leading edge point 73, and correspondingly, the intersection of the camber line D and the rear end of the profile becomes the trailing edge point 74;

a straight line formed by connecting the leading edge point 73 and the trailing edge point 74 of the blade through a straight line is called a chord line F, and the length of the straight line between the leading edge point 73 and the trailing edge point 74 of the blade is called a chord length c;

the midpoint 75 of the chord line F makes the lengths of the chord lines F on both sides thereof the same;

the distance from each point of mean camber line D to chord line F is called camber F, and the maximum distance from each point of mean camber line D to chord line F is called maximum camber F_max；

Maximum camber f_maxThe distance between the position of (a) and the leading edge point 73 is recorded as L, which is called distance L for short;

the shape of the rear edge is arc-shaped.

The camber line D, the chord line F, the chord length c, the camber F and the maximum camber F are led out_maxWill be referred to several times in the following of the present embodiment, the following of which will not be explained.

Furthermore, it should be noted that "maximum camber f of the blades of the first and/or

trailing sections

10, 20" is_maxThe ratio of which to the chord length c is smaller than the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxThe ratio to the chord length c "includes the following cases:

maximum camber f of the blades of the first section 10_maxThe ratio of which to the chord length c is smaller than the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxThe ratio to the chord length c;

maximum camber f of the blades of the tail section 20_maxThe ratio of which to the chord length c is smaller than the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxThe ratio to the chord length c;

maximum camber f of the blades of the first and the

last sections

10, 20_maxThe ratio of the chord length c is smaller than the maximum camber f of the blade between the first section 10 and the tail section 20_maxTo the chord length c.

That is, the maximum camber f of the blade of at least one of the two sections, the first section 10 and the last section 20_maxThe ratio of which to the chord length c is smaller than the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxTo the chord length c.

The utility model discloses an inventor discovers, cause current through-flow fan blade mechanism at the rotation in-process, receive the wall effect influence, can make the air current take place to flow the leading cause that worsens is, the unable effectual skin that keeps of blade and air current of first festival 10 and tail festival 20, and cause the blade of first festival 10 and tail festival 20 and the air current of its contact to take place to separate, thereby influence the whole of through-flow fan blade mechanism and just make the air current take place to flow and worsen and influence the normal use of air conditioner, and this kind of problem is more outstanding under the condition of low wind speed.

Therefore, the utility model discloses utilize and make the blade of at least one section in two sections of first festival 10 and tail festival 20 more flat for the blade of the section between first festival 10 and tail festival 20, that is make the maximum camber f of the blade of at least one section in two sections of first festival 10 and tail festival 20_maxThe ratio of the chord length c is smaller than the maximum camber f of the blade between the first section 10 and the tail section 20_maxThe structural form of the blade of at least one of the first section 10 and the tail section 20 is different from the structural form of the blades of other sections, and is exactly more flat than the blades of other sections, so that the blades of the cross-flow fan blade mechanism are fully attached to the air flow, the influence of the wall effect is avoided, and the flow deterioration of the air flow is eliminated.

In addition, wind speeds of 2m/s and below are generally considered as low wind speeds.

Referring to fig. 2, further, the blade of the leading section 10 or the trailing section 20 includes: an outer arc surface 71 and an inner arc surface 72; the extrados face 71 is located on the upper surface of the blade of the first section 10 or the tail section 20; intrados 72 is located on the lower surface of the blade of the leading section 10 or the trailing section 20; wherein the extrados 71 and intrados 72 are convex or concave towards the same side.

Referring to fig. 2, further, both the extrados 71 and intrados 72 are convex upward.

Referring to fig. 2, further, the convex top of extrados 71 is disposed adjacent to the leading edge point 73 of the profile of the blades of the leading and trailing

sections

10, 20.

In general, in the profile view, that is, fig. 2, the leading edge point 73 is located at a ridge line of one side edge in the length direction of the blade of the leading section 10 or the trailing section 20; in this way, the protruding part of the arc surface 71 is arranged adjacent to the leading edge point 73 of the blade profile of the blade of the first section 10 or the tail section 20, so that the airflow firstly passes through the protruding part of the arc surface 71 and then continuously flows along the surface of the blade behind the protruding part in an attached manner in the contact process with the blade, the attaching capability of the airflow and the blade is improved, and the airflow is guided.

Generally, at least a part of the outer arc surface 71 is arranged towards the outside of the cross-flow fan mechanism, and at least a part of the inner arc surface 72 is arranged towards the inside of the cross-flow fan mechanism.

The outer arc surface 71 and the inner arc surface 72 are convex or concave towards the same side, so that the blade profile of the blade is in a C-shaped or C-shaped structure, and for a perfusion fan blade mechanism of an air conditioner, the outer arc surface 71 and the inner arc surface 72 in the structural form are beneficial to enabling air flow to be in full contact with the blade surface of the blade as far as possible, and the body attaching effect of the blade of the first section 10 or the tail section 20 and the air flow is fully ensured in structure. Thereby reducing the influence of wall effect and avoiding the flow deterioration of the airflow.

With reference to fig. 2, further, the maximum camber f of the profile of the blades of the leading section 10 and the trailing section 20_maxIs one.

Maximum camber f of profile in blade profile design_maxMay be two, e.g. with the apex of the camber being flat, or the profile being S-shaped, so that the maximum camber f is_maxAt the top of the two projections, respectively, but with a maximum curvature f_maxWhen the position of (A) is more than one, the skin effect of the air flow and the blade surface is not good at low wind speed, and the maximum camber f_maxIs a convex part capable of ensuring the blade profileThe arc surface is smooth, and the air flow has good mobility along the surface of the blade.

With reference to fig. 2, further, the maximum camber f of the profile of the blades of the leading section 10 and the trailing section 20_maxIs located adjacent to the mid-point 75 of the chord line of the blades of the leading and trailing

sections

10, 20.

Not shown in the drawing, a plurality of blades of the first section 10 or the tail section 20 are arranged around the shaft of the cross-flow fan blade mechanism in a non-equidistant mode.

The blades are arranged around the shaft of the cross-flow fan blade mechanism at unequal intervals, so that noise generated in the rotating process of the blades is reduced, and the use comfort is improved.

Not shown in the drawings, further, the maximum camber to chord ratio of the blades of the leading section 10 and/or the trailing section 20 is 3% to 6%. That is: f. of_max/c＝3％～6％。

In particular, the maximum camber f_maxThe ratio to the chord length c may be 3%, 4%, 5% or 6%.

By the arrangement, the blade is further flattened, so that the body attaching effect of the blade and the airflow is improved.

Not shown in the drawings, and further, the maximum camber f of the blades of the leading section 10 and/or the trailing section 20_maxThe ratio to the chord length c is 6% to 15%. That is: f. of_max/c＝6％～15％。

In particular, the maximum camber f_maxThe ratio to the chord length c may be 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%.

So that the first blade 11 and/or the second blade 21 can keep better fit with the airflow, thereby further reducing the influence caused by the wall effect and fully eliminating the airflow deterioration.

Preferably, the maximum camber f of the blades of the leading and trailing

sections

10, 20_maxThe ratio to the chord length c may be 6%, 7%, 8% or 9%.

Further, the maximum camber f of the blades of the leading and trailing

sections

10, 20_maxThe ratio to the chord length c is 3% to 9%.

Not shown in the drawings, and further, the maximum camber f of the blades of the sections adjacent to the leading section 10 or the trailing section 20_maxThe ratio of the chord length to the chord length is between 3% and 15%.

Thus, the maximum camber f of the blades of the sections adjacent to the first section 10 and the last section 20, respectively_maxThe ratio of the length of the blade to the chord length c is 3-15%, on one hand, the body-attaching effect of the blades at two axial ends (a first section 10 and a tail section 20) of the cross-flow fan blade mechanism and airflow is further enhanced; on the other hand, the blade profile difference of the two axial ends of the cross-flow fan blade mechanism and the middle position is enhanced, and the air flow is fully attached to most of the blades of the cross-flow fan blade mechanism by utilizing the difference complementation.

Preferably, the maximum camber f of the blades of the section adjacent to the first section 10 or the last section 20_maxThe ratio to the chord length was 6%.

Through computer simulation experiments, the maximum camber f of the blades of the first section 10 and the tail section 20 is respectively selected_maxThe profiles with ratios to chord length c of 6%, 9% and 16% were subjected to simulation analysis.

Not shown in the drawings, further, the maximum camber to chord ratio of the blade of the section between the leading section 10 and the trailing section 20 is comprised between 5% and 30%.

Thus, by increasing the maximum camber f of the blade at the section between the leading section 10 and the trailing section 20_maxRatio to chord length c, expanding "the maximum camber f of the blades of the leading and/or trailing

sections

10, 20_maxThe ratio to the chord length c "and" the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxAnd the chord length c, so that the blades of the first section 10, the tail section 20 and other sections are matched more fully, the blades and the airflow keep better skin effect, the influence caused by the wall effect is further reduced, and the airflow flowing deterioration is fully eliminated.

For maximum camber f_maxRatio to chord length cIn case of 6%, see fig. 3:

in a simulation state, by observing the side views of the blades of the first section 10 and the tail section 20, the situation that the airflow is attached to the blades is better after the airflow is in contact with the blades, and the blades effectively do work on the airflow;

specifically, the airflow flowing through the blade profile surface of the blade can still flow along the extending direction of the blade profile, for example, the blade profile extends slightly downwards, and the airflow flowing through the blade continues to flow along the slightly downwards inclined direction.

In addition, in the process that the airflow flows from the left side of the blade to the right side of the blade, the area of the low-flow-speed area formed by the airflow on the right side of the blade, namely the airflow flowing behind the blade, is small, and the good air flow fit condition is also strongly stated.

In addition, it should be noted that, at the maximum camber f_maxIn the simulation analysis chart with the ratio to the chord length c of 6%, 9% and 15%, the vertical coordinate on the left side represents the wind speed in m/s, and e +01 represents the power of 1 of 10, i.e., 10¹And e +00 represents the power of 0 of 10, i.e. 10⁰(ii) a For example, 2.68e +01 means 2.68 times 10 to the power of 1, i.e., 26.8 m/s; for example, 2.23e +00 represents 2.68 multiplied by 10 to the power of 0, i.e., 2.23 m/s; other numerical values are analogized, and the meaning of the vertical coordinate in the drawing will not be explained later in this embodiment.

For maximum camber f_maxFor a ratio of 9% to the chord length c, see fig. 4:

in a simulation state, the separation range of the airflow and the blade is increased after the airflow is contacted with the blade, but the blade can still effectively do work on the airflow.

Specifically, the airflow after flowing through the blade profile surface of the blade can also flow in the direction of the curved extension of the blade, for example, the right side of the blade is curved downward obviously in the figure, and the airflow flowing through the blade can only flow in the direction of slight downward inclination and can not flow completely in the direction of the curved blade profile

In addition, in which the air flow is directed from the left side of the blade to the bladeIn the process of flowing at the right side, the area of the low-flow-speed area of the airflow formed at the right side of the blade, namely the rear part of the airflow flowing through the blade, has the relative maximum curvature f_maxThe low flow velocity region of the air flow with the chord length c of 6% is obviously enlarged, which also strongly indicates that the air flow skin condition is reduced.

Third, for maximum camber f_maxFor a ratio of 16% to the chord length c, see fig. 5:

in the simulation, it was found that the airflow and the blade could not remain close after the airflow was in contact with the blade, i.e. the airflow was separated from the blade.

Specifically, the airflow after flowing through the blade profile surface of the blade does not flow in the direction of the blade profile curve at all, for example, in the figure, the right side of the blade is curved obviously downwards, while the airflow flowing through the blade flows from left to right in the horizontal direction and obviously does not flow in the direction of the blade profile surface curve, that is, the airflow and the blade cannot keep close to each other any more, and the airflow is separated from the blade.

In addition, in the process of flowing the airflow from the left side of the blade to the right side of the blade, the area of the low-flow-speed area of the airflow, which is positioned at the right side of the blade, namely the rear part of the blade, is formed by the airflow, and the area has the relative maximum curvature f_maxThe expansion of the low flow velocity region of the airflow at the ratio of 6% to the chord length c and 9% is much as soon as it extends to the right border of the simulated figure, which also strongly indicates that the airflow and the blades can no longer maintain skin.

Obviously, the maximum camber f_maxA chord length c ratio of 6% is the optimum choice for an air flow skin blade.

Further, the maximum camber f of the blade of the section between the first section 10 and the last section 20_maxThe ratio to the chord length c is greater than 5%.

sections

10, 20_maxThe ratio to the chord length c "and" the maximum camber f of the blade in the section between the leading section 10 and the trailing section 20_maxThe ratio to the chord length c "such that the leading section 10, the trailing section 20, and the likeThe blades of other sections are matched more fully, so that the blades and the airflow keep better fit, the influence caused by the wall effect is further reduced, and the airflow flowing deterioration is fully eliminated.

Referring to fig. 1 and 2, the first section 10 and the second section 20 have the same blade structure.

By the arrangement, the body fitting effect of the blades of the first section 10 and the tail section 20 and the airflow is fully ensured.

In addition, the embodiment also provides an air conditioner, and the air conditioner is provided with the cross-flow fan blade mechanism. The corresponding technical effect achieved by the air conditioner is the same as that of the cross-flow fan blade mechanism, so the explanation is not provided.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.

Claims

1. A cross-flow fan blade mechanism is characterized in that the maximum bending degree f of blades of the first section (10) and/or the tail section (20) is that the sections positioned at two axial ends of the cross-flow fan blade mechanism form a first section (10) and a tail section (20) respectively_maxThe ratio of the maximum camber f of the blade to the chord length is less than the section between the first section (10) and the tail section (20)_maxRatio to chord length.

2. The cross-flow fan blade mechanism according to claim 1, wherein the blades of the first section (10) and the tail section (20) each comprise:

an extrados surface (71) located on the upper surface of the blades of the first and tail sections (10, 20); and

an intrados surface (72) located on the lower surface of the blades of the first and second sections (10, 20);

the outer arc surface (71) and the inner arc surface (72) are both upwards convex, and the top of the convex part of the outer arc surface (71) is adjacent to the front edge point (73) of the blade profile of the first section (10) and the tail section (20).

3. The cross-flow fan blade mechanism according to claim 1, wherein the maximum camber f of the blade profiles of the first section (10) and the tail section (20) is_maxIs one.

4. Cross-flow fan blade mechanism according to claim 3, characterized in that the maximum camber f of the blade profiles of the blades of the first (10) and the tail (20) sections_maxIs located adjacent to the mid-point (75) of the chord line of the blades of the leading section (10) and the trailing section (20).

5. Cross-flow fan blade mechanism according to any of claims 1 to 4, characterized in that the maximum camber f of the blades of the first (10) and/or the tail (20) section_maxThe ratio of the chord length to the chord length is between 3% and 15%.

6. Cross-flow fan blade mechanism according to any of claims 1 to 4, characterized in that the maximum camber f of the blades of the section between the first section (10) and the tail section (20)_maxThe ratio of the chord length to the chord length is between 5% and 30%.

7. Cross-flow fan blade mechanism according to any of claims 1 to 4, characterized in that the maximum camber f of the blades of the segment adjacent to the first segment (10) or the tail segment (20)_maxThe ratio of the chord length to the chord length is between 3% and 15%.

8. The cross-flow fan blade mechanism according to any one of claims 1 to 4, wherein the structure of each blade of the first section (10) is the same as the structure of each blade of the tail section (20).

9. The cross-flow fan blade mechanism according to claim 8, wherein all the blades of the first section (10) or the tail section (20) are arranged at unequal intervals around the rotating shaft of the cross-flow fan blade mechanism along the circumference of the first section (10) or the tail section (20).

10. An air conditioner, characterized in that the air conditioner is provided with the cross-flow fan blade mechanism of any one of claims 1 to 9.