CN108758837A

CN108758837A - Axial flow blower component and air conditioner

Info

Publication number: CN108758837A
Application number: CN201811022533.4A
Authority: CN
Inventors: 汪先送; 蔡序杰
Original assignee: Midea Group Co Ltd; Guangdong Midea Refrigeration Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2018-11-06

Abstract

The present invention discloses a kind of axial flow blower component and air conditioner, wherein axial flow blower component includes chimney fan, and there is the chimney fan front port and rear port, the axial flow blower component to further include：Baffle liner, the baffle liner are installed on the rear port of the chimney fan, diameter 250mm≤d0≤450mm of the chimney fan, the axial width of the baffle liner is m, the rear end radial spacing of 20mm≤m≤80mm, the rear end of the baffle liner and the chimney fan is d1,10mm≤d1≤50mm.Technical solution of the present invention reduces noise when axial flow blower assembly operating.

Description

Axial fan subassembly and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to an axial flow fan assembly and an air conditioner comprising the same.

Background

The axial flow fan assembly is internally provided with one axial flow wind wheel or two axial flow wind wheels or more than two axial flow wind wheels, and the air outlet quantity is larger when the axial flow fan provided with two or more than two axial flow wind wheels operates.

An axial flow fan assembly is installed in part of existing air conditioner indoor units. As the axial flow fan component is operated, the larger noise can not be avoided.

Disclosure of Invention

The invention mainly aims to provide an axial flow fan assembly and aims to solve the problem of high noise when an indoor unit of an air conditioner operates.

In order to achieve the above object, the axial flow fan assembly provided by the present invention includes an air outlet cylinder and at least one fan blade mounted on the air outlet cylinder, wherein the air outlet cylinder has a front port and a rear port, and the axial flow fan assembly further includes:

the guide ring is arranged at the rear port of the air outlet cylinder and is arranged backwards in a flaring manner;

d0 is not less than 250mm and not more than 450mm in diameter of the air outlet cylinder, the axial width of the flow guide ring is m, m is not less than 20mm and not more than 80mm, the radial distance between the rear end of the flow guide ring and the rear end of the air outlet cylinder is d1, and d1 is not less than 10mm and not more than 50 mm.

Preferably, it is characterized in that d0 is 300mm ≦ 400 mm.

Preferably, 30mm m 60 mm.

Preferably, 30mm < d 1< 40 mm.

Preferably, the inner wall surface of the guide ring is an arc surface which protrudes outwards backwards.

Preferably, the inner wall surface of the flow guiding ring is tangent to the inner wall surface of the air outlet cylinder.

Preferably, the curvature of the inner wall surface of the deflector ring is gradually reduced rearward.

Preferably, the line segment of the inner wall surface of the guide ring, which is cut by a plane parallel to the axis of the guide ring, includes a plurality of arc segments arranged backwards, and the plurality of arc segments are connected in sequence.

Preferably, the line segment of the inner wall surface of the flow guide ring, which is cut by a plane parallel to the axis of the flow guide ring, includes a plurality of arc segments and straight line segments which are arranged backwards, wherein the arc segments are arranged in a cambered surface which is convex backwards, the arc segments are connected with the rear end of the air outlet barrel, and the arc segments and the straight line segments are alternately arranged.

Preferably, the number of the fan blades in the air outlet cylinder is multiple, and the fan blades are arranged at intervals along the axial direction of the air outlet cylinder.

Preferably, the number of the fan blades is two, the two fan blades are a front fan blade and a rear fan blade, and the rotation direction of the front fan blade when blowing the airflow to the air outlet is opposite to the rotation direction of the rear fan blade when blowing the airflow to the air outlet.

Preferably, the rear fan blade is at least partially positioned in the air outlet cylinder, the maximum axial distance between the front edge of the rear fan blade and the air inlet is d2, the height of the rear fan blade is d3, and d is₃/3≤d2≤4d₃/3。

The invention also provides an air conditioner, comprising an axial flow fan assembly, wherein the axial flow fan assembly comprises an air outlet cylinder and at least one fan blade arranged on the air outlet cylinder, the air outlet cylinder is provided with a front port and a rear port, and the axial flow fan assembly further comprises:

d0 is not less than 250mm and not more than 450mm in diameter of the air outlet cylinder, the axial width of the flow guide ring is m, m is not less than 20mm and not more than 80mm, the radial distance between the rear end of the flow guide ring and the rear end of the air outlet cylinder is d1, and d1 is not less than 10mm and not more than 50 mm;

the air conditioner comprises an air conditioner indoor unit and an air conditioner outdoor unit, wherein the axial flow fan assembly is placed in the air conditioner indoor unit, and the air conditioner indoor unit is a floor type air conditioner indoor unit or a ceiling type air conditioner indoor unit or a wall-mounted type air conditioner indoor unit; and/or the presence of a gas in the gas,

the axial flow fan assembly is placed in the air conditioner outdoor unit.

Preferably, the air-conditioning indoor unit comprises a shell and a heat exchanger, the shell is provided with an air inlet and an air outlet, the heat exchanger is arranged corresponding to the air inlet, the axial flow fan assembly is installed between the heat exchanger and the air outlet, the distance between the rear blade and the heat exchanger is d4, and d4 is not less than 30mm and not more than 120 mm.

Preferably, d4 is 60 mm-80 mm.

Preferably, the axial flow fan assembly is a first fan, a second fan is further arranged in the air conditioner, the first fan and the second fan are both arranged in the indoor unit of the air conditioner, and d4 is more than or equal to 30mm and less than or equal to 40 mm; or,

the first fan and the second fan are both arranged in the air conditioner outdoor unit, and d4 is larger than or equal to 30mm and smaller than or equal to 40 mm.

Preferably, the second fan is an axial fan or a centrifugal fan or a cross-flow fan.

According to the technical scheme, the diameter d0 of the air outlet cylinder of the axial flow fan assembly is limited to be not less than 250mm and not more than d0 and not more than 450mm, the axial width m of the flow guide ring is limited to be not less than 20mm and not more than 80mm, and the radial distance d1 between the rear end of the flow guide ring and the rear end of the air outlet cylinder is limited to be not less than 10mm and not more than d1 and not more than 50mm, so that the noise generated during the operation of the axial flow fan assembly is greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a first embodiment of the present invention;

FIG. 2 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a second embodiment of the present invention;

FIG. 3 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a third embodiment of the present invention;

FIG. 4 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a fourth embodiment of the present invention;

FIG. 5 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a fifth embodiment of the present invention;

FIG. 6 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a sixth embodiment of the present invention;

FIG. 7 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to a seventh embodiment of the present invention;

fig. 8 is a schematic view of an assembly structure of an axial flow fan assembly in an indoor unit of an air conditioner according to an eighth embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				11	Air outlet cylinder	121a	Front motor
122a	Front fan blade	123a	Front support
				121b	Rear motor	122b	Rear fan blade
123b	Rear support	13	Flow guiding ring
				21	Outer casing	21a	Front panel
21b	Back plate	30	Heat exchanger

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are 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. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an axial flow fan assembly, an air conditioner indoor unit comprising the axial flow fan assembly and an air conditioner comprising the air conditioner indoor unit. The following description takes a floor type air conditioner indoor unit as a specific embodiment.

Referring to fig. 1, the present invention provides an axial flow fan assembly, which includes an air outlet barrel 11, wherein the air outlet barrel 11 has a front port and a rear port, and the axial flow fan assembly further includes:

the guide ring 13 is arranged at the rear end of the air outlet cylinder 11, and the guide ring 13 is arranged backwards in a flaring manner;

the diameter d0, d0 ≦ 450mm of the outlet housing 11, e.g. d0 ≦ 280mm, 300mm, 330mm, 350mm, 380mm, 400mm, 420mm or 440 mm. Of course, d0 e [300mm,400mm ] is preferred here.

Specifically, the axial flow fan assembly may be a single-stage axial flow fan (only one fan blade), or a multi-stage axial flow fan (a plurality of fan blades, for example, 2 fan blades, 3 fan blades, or even more fan blades are disposed in the air outlet cylinder, and the plurality of fan blades are distributed at intervals along the axial direction of the air outlet cylinder). For the multi-stage axial flow fan, the following embodiments will be specifically described with reference to a cyclone fan as a specific embodiment. For the counter-rotating fan, a front fan blade and a rear fan blade are arranged in the air outlet cylinder, and the rotating direction of the front fan blade when blowing airflow to the air outlet is opposite to the rotating direction of the rear fan blade when blowing airflow to the air outlet.

The axial flow fan assembly comprises an air outlet cylinder 11, a flow guide ring 13, front fan blades 122a, a front support 123a, a front motor 121a, rear fan blades 122b, a rear support 123b and a rear motor 121 b. Two ends of the air outlet cylinder 11 are open, namely a front port and a rear port are formed. The deflector ring 13 is mounted at the rear port. The mode of connection of water conservancy diversion circle 13 and play dryer 11 can be the welding, also can make integrated into one piece, can also be grafting, can also be form the internal thread in the play dryer 11, is formed with the external screw thread on the water conservancy diversion circle 13, and the two spiro union adaptations.

The rear bracket 123b may be installed in the air-out duct 11 or in the deflector ring 13. The rear bracket 123b may be fixed to the air-out drum 11, or may be fixed to the deflector ring 13. The rear motor 121b is mounted on the rear bracket 123b, and the rear fan blade 122b is mounted on the rear motor 121 b. The front bracket 123a is mounted at a front end of the outlet housing 11. The front motor 121a is mounted to the front bracket 123 a.

The radius of the rear port of the air outlet barrel 11 is R1, the radius of the rear port of the flow guiding ring 13 is R2 (it should be noted that the radius of the front port of the flow guiding ring 13 is equal to the radius of the rear port of the air outlet barrel 11), and d1 is R2-R1. In the case where d1 is 0, that is, when the baffle ring 13 is provided in a straight tubular shape. In addition, the width of the guide ring is not easy to be too large, if the width is too large, the curvature of the inner wall surface of the guide ring is small, and the air guide effect is influenced; the width of the guide ring is not easy to be too small, if the width is too small, the curvature of the inner wall surface of the guide ring is too large, namely the flaring amplitude is too large, and thus, the guide ring is not beneficial to wind guiding.

In order to test the width value range of the guide ring,

the following experiment was performed with d1 ═ 10 mm:

TABLE A

The following experiment was performed with d1 ═ 50 mm:

TABLE B

The following experiment was performed with d1 ═ 80 mm:

watch C

As can be seen from tables A to C above, when d1 is between 10mm and 50mm, and m is between 20mm and 80mm, the overall noise is relatively low.

the d1 measuring method includes the steps of ① measuring radiuses of two ports of the guide ring, ② calculating difference between two measured radiuses and taking absolute values to obtain a d1 value, and ② measuring the m value, namely, 5 points are taken on the periphery of an air outlet of the guide ring, 5 points are arranged at equal intervals in the circumferential direction of the outlet, thirdly, respectively measuring vertical distances from the 5 points to the plane where an air inlet of the guide ring is located, and thirdly, taking the average value of the 5 vertical distances to obtain the m value.

For testing the influence of d1 axial fan subassembly noise, take out the tuber pipe 11 diameter to be 360mm, 1200 square air volume, the width m of water conservancy diversion circle 13 is 30mm for the example and test, the experiment is as follows:

TABLE 1

For testing the influence of d1 axial fan subassembly noise, take out the tuber pipe 11 diameter to be 360mm, 1200 square air volume, the width m of water conservancy diversion circle 13 is 60mm for the example and test, the experiment is as follows:

TABLE 2

For d1, on the one hand, d1 should not be too large in view of the volume manufacturing of the axial fan assembly. And d1, if too small, will also result in poor noise reduction. Therefore, d1 should not be too small.

As can be seen from table 1, the noise value is relatively high and reaches 48.7dB when d1 is equal to 0, gradually decreases as d1 increases from 0 to 40mm, and reaches a minimum of 45.1dB when d1 increases to 40 mm.

While the noise level increases as the value of d1 continues to increase.

And (3) analysis: when d1 is equal to 0, when the airflow enters the guide cylinder, the corner where the external airflow enters the guide ring 13 is large and sharp (the peripheral airflow turns 90 ° to enter the guide ring 13), so that the energy loss of the airflow is large, and large noise is brought.

When d1 is within the range of 10mm to 40mm, under the guiding action of the guiding ring 13, the airflow flows into the guiding ring 13 relatively gently, and there is no sharp turn during the flowing, so the energy loss of the airflow is small, and in addition, the eddy effect generated by the airflow following the guiding ring 13 is correspondingly low.

When d1 continues to rise, the rear port of the deflector ring 13 is relatively large, the front port of the deflector ring 13 is relatively small, a large amount of external airflow is converged into the front port from the rear port, and the capacity of the front port is limited, so that part of the airflow cannot pass through the front port in time, a vortex is formed between the front port and the rear port, and then noise is greatly increased again.

As can be seen from table 1, the noise value is at a lower level when d1 is between 30m and 40 mm.

Based on the same analysis, it can be seen from table 2 that d1 is at a lower level of noise at 30mm to 50 mm. The axial flow fan assembly can maintain low noise when the thickness of the baffle ring 13 is in the range of 30mm to 50mm and d1 is in the range of 30mm to 40 mm.

Referring to fig. 2 to 8, in the above embodiment, the inner wall surface of the flow guiding ring 13 may be a straight surface flaring, a convex cambered surface flaring, a concave cambered surface flaring, or a combination of a convex cambered surface and a straight surface. Certainly, to the internal face that the flaring of straight face set up, the air current is by the preceding port of the back port flow direction of water conservancy diversion circle 13 back, and the air current will flow to in the play dryer 11, however, the internal face of water conservancy diversion circle 13 and play dryer 11 junction turning this moment are great, and when the air current flows through this position, the air current velocity of flow loss is more serious, and vortex phenomenon is also more serious (can set up protruding cambered surface between straight face and play dryer 11 excessive to the vortex situation that forms when slowing down the air current and flowing into the play dryer). For the inner wall surface of the flaring of the concave cambered surface, the airflow velocity loss phenomenon is larger, and the vortex phenomenon is more serious. Therefore, in the present embodiment, the inner wall surface of the deflector ring 13 is flared in an arc shape protruding backwards.

In the above embodiment, in order to make the airflow flow more smoothly, the inner wall surface of the flow guiding ring 13 is tangent to the inner wall surface of the air outlet cylinder 11.

Referring to fig. 3, in a preferred embodiment, in order to reduce noise, the curvature of the inner wall surface of the deflector ring 13 is gradually reduced backward.

For the situation that the curvature of the inner wall surface of the deflector ring 13 is not changed backwards, the curvature cannot be too large, otherwise, once the width of the deflector ring 13 is large, when the airflow flows from the rear port to the front port of the deflector ring 13, the flow direction needs to be adjusted greatly, so that the airflow is subjected to large resistance, and the formed noise is large.

In view of this, in the present embodiment, by setting the curvature of the inner wall surface to be gradually decreased rearward, when the airflow flows from the rear port to the front port of the deflector ring 13, the resistance to the airflow is relatively small, and the noise is relatively low.

Referring to fig. 5, different from the previous embodiment, in another preferred embodiment, in order to make the airflow flow more smoothly when the guiding ring 13 guides the airflow, a line segment of the inner surface of the guiding ring 13, which is cut from a plane parallel to the axis of the guiding ring 13, includes a plurality of arc segments which are arranged backwards and gradually increase in diameter, and the plurality of arc segments are sequentially connected.

In the above embodiment, the curvature of the inner wall surface of the baffle ring 13 gradually decreases backward, and in the present embodiment, the curvature of the inner wall surface of the baffle ring 13 gradually decreases backward. For example, the inner wall surface of the baffle ring 13 includes three circular arc sections arranged backwards, and the curvature radiuses of the three circular arc sections are r1, r2 and r3, wherein r1< r2< r 3.

Referring to fig. 4 and 6, similarly, in order to make the airflow flow more smoothly when the flow guiding ring 13 guides the airflow, a line segment cut by a plane parallel to the axis of the flow guiding ring 13 on the inner surface of the flow guiding ring 13 includes a plurality of arc segments and straight line segments arranged backward, the arc segments are connected to the rear end of the air outlet barrel 11, and the arc segments and the straight line segments are alternately arranged.

For this case, the sum of the number of the arc sections and the number of the straight line sections is greater than or equal to 3, that is, … …, the inner wall surface of the last section of the deflector ring 13 may be the straight line section or the arc section. Of course, in order to make the air flow enter the guide ring 13 more smoothly, the inner wall surface of the last section of the guide ring 13 is preferably arranged as an arc section.

When entering the deflector ring 13, the airflow has a coanda effect, so that part of the airflow flows along the inner wall surface of the deflector ring 13. For airflow coanda, a straight surface is best for coanda and a cambered surface is relatively poor.

Under the condition that the value of d1 is constant, if the whole inner wall surface is provided with the arc section, the whole curvature of the arc section cannot be larger, otherwise, a more serious eddy phenomenon can be caused; the curvature of the arc section cannot be smaller, otherwise the resistance of the airflow entering the flow guide ring 13 is larger, and finally the noise is larger. Even if the curvature is set to be appropriate (not large or small, between a straight line at two points and a semicircular arc), the wall-attaching effect of the airflow is poor, and finally, the formed vortex effect is not ideal.

In this embodiment, the inner wall surface of the deflector ring 13 is made into circular arc sections and is alternately arranged with straight sections, so that the curvature problem (no matter whether the curvature is large or small, the noise is relatively large) is solved. On the other hand, when the airflow flows along the inner wall of the guide ring 13, because the airflow flows from the arc section to the curve section (or from the curve section to the arc section), the curvature of the arc section is small, the line section is short, the wall attaching effect is good, and when the airflow is excessive to the straight section, the wall attaching airflow does not excessively generate the wall detaching phenomenon. Thus, in general, the noise reduction of the deflector ring 13 in this embodiment is further improved.

Referring to FIGS. 2 and 7, in a preferred embodiment, the rear blades areThe maximum axial distance between the front edge and the opening of the air inlet is d2, the height of the rear blade (the height of the blade in the axial direction of the air outlet cylinder 11) is d3, d₃/3≤d2≤4d₃/3。

Here, the position of the rear fan blade 122b on the air outlet cylinder 11 also affects the air outlet noise, and here, in order to verify the effect, the experiment is as follows:

the test is carried out by taking the arrangement that the diameter of the air outlet cylinder 11 is 360mm, the air volume of 1200 square, the width of the flow guide ring 13 is 30mm, and the inner wall surface of the flow guide ring 13 is backward in a convex arc shape as an example:

TABLE 3

As can be seen from table 3, when d2 is equal to 0, the noise of the axial flow fan assembly is relatively large, reaching 54.6dB, and the noise value gradually decreases with the penetration of the rear fan blade 122 b. This is because, when d2 is equal to 0, the gap between the rear fan blade 122b and the baffle ring 13 is large, and the airflow generates a vortex flow in the gap, which causes wind resistance and noise. With the extension of the rear fan blades 122b, the average distance between the rear fan blades 122b and the guide ring 13 and the inner wall of the guide cylinder is gradually reduced, so that the vortex effect is reduced, and the noise is reduced. As can be seen from the table, when d2 is represented by d₃Increase to d from/4₃At/3, the noise reduction reaches 2.4 dB. The reasons may be as follows:

when d2 ═ d₃At/4, there is 3d₃The rear fan blade 122b of the/4 is positioned in the guide ring 13 (3 d for short in the following)₃Part 1d of the air outlet pipe 11₃/4 rear fan blade 122b is abbreviated as d₃Part/4), 3d because the distances between the rear fan blade 122b and the guide ring 13 and between the rear fan blade 122b and the air outlet cylinder 11 are different₃The/4 part of the rotation generates higher vibration frequency per se, and d₃The/4 part generates a low vibration frequency by itself, but the two parts are fixedly connected together, so the final vibration frequency depends on 3d₃Part/4, resulting in relatively loud noise. When d2 ═d₃At/3, there is 2d₃The/3 rear fan blade 122b is positioned in the guide ring 13, d₃Part/3 and 2d₃The vibration frequency of the/3 part is different, but due to d₃The/3 portion already occupies a larger portion of the rear fan blades 122b, although 2d₃The/3 part occupies a larger part of the whole fan blade, but the part is not enough to control d₃The frequency of oscillation of the/3 part, which, when connected together, is dependent on d₃A/3 part, and thus lower noise.

Reach 4d at d3₃After/3, the noise reduction amplitude is found to be smaller, and the meaning that the rear fan blade 122b continues to extend into the air outlet cylinder 11 cannot be achieved, but the air outlet cylinder 11 is longer, and the manufacturing cost is increased.

In view of this, d2 is at d₃3 to 4d₃Preferred is the case of/3.

Referring to fig. 1 to 8, the present invention further provides an indoor unit of an air conditioner having the above axial flow fan assembly, the indoor unit has a casing 21, the casing 21 has a front panel 21a and a back panel 21b, the front panel 21a has an air outlet, the air outlet is provided with an air outlet frame, the back panel 21b has an air inlet, the air inlet is provided with an air inlet grille, a filter screen is disposed inside the air inlet grille, and a heat exchanger 30 is disposed inside the casing 21 and between the air inlet and the air outlet. The heat exchanger 30 may be mounted to the back plate 21b or to the side plate, although other mounting methods are not excluded. The axial flow fan assembly is installed at the air outlet, when the air-conditioning indoor unit executes a refrigeration function, the axial flow fan assembly operates, negative pressure is formed behind the axial flow fan assembly, and outside air passes through the heat exchanger 30 along the air inlet under the action of the negative pressure and then is blown to the front of the air-conditioning indoor unit by the axial flow fan assembly.

Referring to fig. 8, on the basis of the above embodiment, in order to reduce noise generated during operation of the air conditioner, the distance between the rear end of the wind guide ring and the heat exchanger 30 is d4, and d4 is greater than or equal to 20mm and less than or equal to 120 mm.

TABLE 4

For the flow guide ring 13 arranged in a flaring manner, the larger the d4 is, the lower the noise of the axial flow fan assembly with the same air volume is, when the d4 is larger than 120mm, the noise with the same air volume is basically unchanged, so from the noise perspective, the optimal d4 is 60mm, when the d4 is too large, the thickness of the whole machine is affected, and when the d4 is larger than 80mm, the reduction range of the noise with the air volume is reduced, so that, in sum, the d4 is preferably 60mm to 80 mm.

The above embodiments are directed to a single bipolar axial flow fan (counter-rotating fan).

In addition, through tests, when a single bipolar axial flow fan (a counter-rotating fan, which is named as a first fan) and other fans (named as second fans) are arranged in the air conditioner, such as an axial flow fan, a cross-flow fan or a centrifugal fan, the optimal value of d4 changes. Of course, the first fan and the second fan may be both disposed in the indoor unit of the air conditioner or both disposed in the outdoor unit of the air conditioner.

In order to test the relationship between the noise generated by more than two fans and d4, the experiment is as follows (taking an indoor unit as an example):

TABLE 5

it can be seen from table 5 that when d4 is 60mm to 80mm, the noise of the air-conditioning indoor unit is relatively high, and when d4 is 30mm to 40mm, the noise of the air-conditioning indoor unit is at the lowest level, and especially when d4 is equal to 30mm, the noise value is at the lowest state.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The utility model provides an axial fan subassembly, include the play dryer with install in at least one fan blade of play dryer, the play dryer has preceding port and back port, its characterized in that, axial fan subassembly still includes:

2. The axial fan assembly of claim 1, wherein d0 is 300mm ≦ 400 mm.

3. The axial fan assembly of claim 1, wherein 30mm ≦ m ≦ 60 mm.

4. The axial fan assembly of claim 1, wherein d1 is 30mm ≦ 40 mm.

5. The axial flow fan assembly of claim 1, wherein the inner wall surface of the flow guide ring is formed in a curved surface protruding rearward.

6. The axial fan assembly according to claim 5, wherein an inner wall surface of the flow guide ring is tangent to an inner wall surface of the outlet housing.

7. The axial fan assembly of claim 5, wherein a curvature of an inner wall surface of the flow guide ring is gradually reduced rearward.

8. The axial flow fan assembly according to claim 5, wherein the line segment of the inner wall surface of the flow guide ring, which is cut by a plane parallel to the axis of the flow guide ring, includes a plurality of arc segments arranged backward, and the plurality of arc segments are connected in sequence.

9. The axial flow fan assembly according to claim 1, wherein the line segment of the inner wall surface of the baffle ring, which is cut by a plane parallel to the axis of the baffle ring, includes a plurality of arc segments and straight segments arranged backward, wherein the arc segments are arranged in an arc surface protruding backward and outward, the arc segments are connected to the rear end of the outlet barrel, and the arc segments and the straight segments are alternately arranged.

10. The axial flow fan assembly according to any one of claims 1 to 9, wherein the number of the fan blades in the outlet duct is plural, and the plural fan blades are arranged at intervals along the axial direction of the outlet duct.

11. The axial flow fan assembly of claim 10, wherein the number of the blades is two, the two blades are a front blade and a rear blade, and a rotation direction of the front blade when blowing the airflow to the air outlet is opposite to a rotation direction of the rear blade when blowing the airflow to the air outlet. .

12. The axial fan assembly of claim 11, wherein said rear fan blade is at least partially disposed within said outlet barrel, a maximum axial distance between a front edge of said rear fan blade and said inlet opening is d2, and a height of said rear fan blade is d3, d₃/3≤d2≤4d₃/3。

13. An air conditioner, characterized in that, comprising the axial flow fan component as claimed in any one of claims 1 to 12, the air conditioner comprises an indoor unit of the air conditioner and an outdoor unit of the air conditioner, the axial flow fan component is placed in the indoor unit of the air conditioner, and the indoor unit of the air conditioner is a floor type indoor unit of the air conditioner, or a ceiling type indoor unit of the air conditioner, or a wall type indoor unit of the air conditioner; and/or the presence of a gas in the gas,

the axial flow fan assembly is placed in the air conditioner outdoor unit.

14. The air conditioner as claimed in claim 13, wherein the indoor unit of the air conditioner comprises a casing and a heat exchanger, the casing has an air inlet and an air outlet, the heat exchanger is disposed corresponding to the air inlet, the axial flow fan assembly is installed between the heat exchanger and the air outlet, the distance between the rear blade and the heat exchanger is d4, and d4 is greater than or equal to 30mm and less than or equal to 120 mm.

15. The air conditioner as claimed in claim 14, wherein d4 is 60mm 80 mm.

16. The air conditioner as claimed in claim 14, wherein the axial flow fan assembly is a first fan, a second fan is further provided in the air conditioner, the first fan and the second fan are both provided in the indoor unit of the air conditioner, and d4 is greater than or equal to 30mm and less than or equal to 40 mm; or,

17. The air conditioner of claim 16, wherein the second fan is an axial fan or a centrifugal fan or a cross-flow fan.