JP2002257381A - Air supply device and outdoor machine for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the generation of operation noise by constituting an air supply device by a blade-shaped propeller fan capable of realizing high silent running performance even when the air supply device is integrated into an air conditioner. SOLUTION: The radial section shape of each blade 13 of a propeller fan 4 of which the air supply device 3 consists all forms a shape protruding toward the suction side. In the arbitrary radial section passing the rotation center of the propeller fan 4, the outer peripheral part (namely, a blade end) P of each blade 13 is inclined toward the air supply side. On the suction side, the shape of the outer peripheral part (namely, a blade end) P of each blade 13 is matched with a flow w2 of outer peripheral suction, and growth of a blade end vortex E is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower and an outdoor unit for an air conditioner.

[0002]

2. Description of the Related Art For example, in the case of an outdoor unit for an air conditioner, as shown in FIGS. 1 to 3, a propeller fan 4 and a suction area X and a blowing area Y located outside the propeller fan 4.
A blower 3 having a bell mouth 5 for partitioning the propeller fan 4 and a fan guard 6 positioned on the blowout side of the propeller fan 4.
The heat exchanger 2 is disposed downstream of the heat exchanger 2 in the casing 1. The inside of the casing 1 is partitioned by a partition plate 7 into a heat exchange chamber 8 and a machine chamber 9, and the heat exchange chamber 8 has an air inlet 10 formed on the back surface and one side surface of the casing 1. A heat exchanger 2 having an L-shaped cross section and a blower 3 located downstream of the heat exchanger 2 are disposed on the machine room 9. 11 are provided. Reference numeral 12 denotes a fan motor.

[0003] In addition to the outdoor unit for an air conditioner having the above-described configuration, a ventilation device 3 (ie, a propeller fan 4 and a portion located outside the propeller fan 4) having a similar structure in a ventilation fan, an air purifier, and the like. (A blower provided with a bell mouth 5 that separates the suction area and the blowout area from each other) and a fan guard 6 located on the blowout side of the propeller fan in some cases.

[0004] In the case of the blower 3 having the above-mentioned structure, the noise from the propeller fan 4 and the noise generated when the airflow from the propeller fan 4 collides with the fan guard 6 increase the operating noise. There was a defect.

Conventionally, to cope with the above-mentioned problem,
Developed a high-performance propeller fan as a single unit, and confirmed the improvement in performance when a blower was configured by incorporating this propeller fan, and decided whether or not it could be mounted on the product. In this case, there is a fact that even if the performance of the propeller fan alone can be confirmed to be large, the effect is greatly reduced when actually incorporated into a product. This is because the propeller fan alone has nothing on the blowout side, whereas the fan guard 6 exists on the blowout side as shown in FIG. 4 when incorporated as a blower. . In other words, the turbulence caused by the airflow W blown out from the propeller fan 4 colliding with the fan guard 6 in the blower, while the turbulence of the airflow near the blades only needs to be reduced by the fan alone.
Therefore, it is important to suppress the occurrence of the disturbance e. The fan guard 6 is configured by supporting a large number of blades 6a, 6a,... With support ribs 6b.

As described above, a propeller fan 4 having a thick-walled blade 13 represented by an airfoil blade has been developed to improve the performance of a propeller fan alone. Here, the airfoil wing is shown in FIG.
As shown in the figure, the front edge F has an arc shape, and the thickness gradually increases toward the middle portion C, and gradually decreases from the middle portion C toward the rear edge B. FIG. 5 (b) shows a wing-shaped one similar to the airfoil wing (hereinafter referred to as a deformed airfoil wing).
(D).

[0007] The deformed airfoil wing shown in FIG.
The wing has a bulging portion at the leading edge portion F, and has a wing shape in which the wall thickness rapidly decreases from the bulging portion and gradually decreases toward the trailing edge portion B, as shown in FIG. The deformed airfoil blade shown in (c) has an arc shape at the leading edge F, and has a blade shape whose thickness gradually decreases toward the trailing edge B, as shown in FIG. The profiled airfoil blade shown has an arc-shaped leading edge F, and once the thickness increases toward the trailing edge B, the thickness suddenly decreases, and then toward the trailing edge B. Therefore, it has a wing shape in which the thickness is gradually reduced. These modified airfoil blades also have performance similar to airfoil blades.

A blade 13 having an airfoil wing shape;
Comparing the performance of the fan alone with the thin plate-shaped blade 13 ′ having a substantially constant thickness from the leading edge F to the trailing edge B, FIG. As shown in a), peeling on the blade surface is suppressed,
While airflow turbulence e 'due to separation occurs only at the trailing edge B, in the case of the thin blade 13', FIG.
As shown in (b), the airflow turbulence e 'due to separation also occurs on the blade surface, and the airflow turbulence e' at the trailing edge B is also large. Also, airfoil wing-shaped blades 13
In the case of the propeller fan 4 having the shape shown in FIG. 7A, since the shape of the blade tip P is a shape obtained by cutting the pressure surface 13a into a substantially arc shape, as shown in FIG.
The blade tip vortex E formed by the leakage flow w ₁ leaking from the suction surface 13 a to the suction surface 13 b and the suction flow w ₂ on the outer peripheral side is generated smoothly and is stable, and the turbulence is small. In the case of a propeller fan 4 'having 13', FIG.
As shown in FIG. 5, the tip vortex E ′ formed by the leakage flow w ₁ ′ leaking from the pressure surface 13 a ′ to the suction surface 13 b ′ at the blade tip P and the suction flow w ₂ ′ at the outer periphery is formed by an airfoil blade. Although smaller than the blade 13, it is unstable and disturbed. In FIG. 7, reference numerals 14 and 14 'denote hubs serving as rotation centers of the propeller fans 4, 4'.

[0009]

However, the propeller fan 4 having the airfoil blade-shaped blades 13 described above.
When the blower incorporating the propeller fan 4 'having the thin plate-shaped blades 13' is compared with the blower incorporating the propeller fan, the performance difference of the fan alone becomes small (in other words, the airfoil blade-shaped The performance of the blower incorporating the propeller fan 4 having the blades 13 is reduced).

The cause is that the airfoil blade-shaped blade 1
In the case of the blower incorporating the propeller fan 4 having the blade 3, the blade tip vortex E generated at the blade tip P of the blade 13 is more stable than the blade tip vortex E ′ of the thin plate-shaped blade 13 ′. The size of the tip vortex E is larger than the tip vortex E ′, and FIG.
As shown in FIG. 9 and FIG. 9, it can be inferred that a large wing tip vortex E collides with the fan guard 6, so that the air turbulence e becomes severe and the noise generated from the fan guard 6 increases. It should be noted that the airflow indicated by the dashed line in FIG. 9 is generated at a position symmetrical to the airflow indicated by the solid line, and is illustrated in the same cross section for convenience of explanation.

That is, the conventional technique (that is, the technique for improving the performance of a single fan) has a disadvantage that its superiority when incorporated as a blower is reduced.

On the other hand, in the case of the blade 13 'having the shape of a thin plate, the degree of performance degradation is lower than that of the blade 13 having the shape of an airfoil when the blade 13' is incorporated as a blower compared to its single performance. So, taking advantage of its features,
It is desired to further improve the performance at the time of assembling.

The present invention has been made in view of the above points, and it is possible to construct a blower using a propeller fan having a predetermined wing shape capable of maintaining high noise even when incorporated as a blower. It is intended to reduce the operation noise.

[0014]

Means for Solving the Problems (1) The invention of claim 1 In the invention of claim 1, as a means for solving the above-mentioned problem, a plurality of hubs 14 and 14 'serving as rotation centers are provided on the outer peripheral surface. A propeller fan 4, 4 ′ having blades 13, 13 ′, 13 ′, 13 ′, and a bell mouth 5 located outside the propeller fan 4, 4 ′ to partition a suction area X and a blowing area Y. A fan guard 6 positioned on the blow-out side of the propeller fans 4, 4 ', wherein each of the blades 13, 13' has a radial cross-sectional shape that is convex toward the suction side, and the propeller The outer peripheral portion (in other words, the blade tip) P of each of the blades 13, 13 ′ is inclined toward the blowing side in an arbitrary radial cross section passing through the rotation center O of the fans 4, 4 ′.

With the above construction, the outer peripheral portions of the respective blades 13 and 13 '(in other words, on the suction side)
The shape of the wing tip) P matches the outer peripheral suction flow w ₂ , w ₂ ′, and the growth of the wing tip vortex E, E ′ is suppressed. As a result, when incorporated into the blower 3, the turbulence e due to the collision between the tip vortices E and E 'and the fan guard 6 is reduced, the noise from the fan guard 6 is reduced, and the operation of the blower 3 is reduced. Sound can be reduced.

(2) According to the second aspect of the present invention, as a means for solving the above-mentioned problem, a thick-walled wing represented by an airfoil wing is provided on the outer peripheral surface of the hub 14 serving as a center of rotation. A plurality of blades 13, 13
, A bell mouth 5 located outside the propeller fan 4 to partition the suction area X and the blowing area Y, and a fan guard 6 located on the blowing side of the propeller fan 4. In the blower, the radial cross-sectional shape of each of the blades 13 is all convex toward the suction side, and the outer peripheral portion (in other words, the outer peripheral portion of each of the blades 13 in an arbitrary radial cross-section passing through the rotation center O of the propeller fan 4). Wing tip) P is inclined toward the blowing side.

With the above-described structure, the outer peripheral portion (in other words, the blade tip) P of each blade 13 on the suction side.
Shape becomes possible to match the outer peripheral suction flow w _2, growth of the wing tip vortex E is suppressed. As a result, when incorporated in the blower 3, the turbulence due to the collision between the tip vortex E and the fan guard 6 is reduced, the noise from the fan guard 6 is reduced, and the operating noise of the blower 3 is reduced. Can be planned.

(3) Invention of Claim 3 According to the invention of Claim 3, as a means for solving the above-mentioned problem, a plurality of thin plate-shaped blades 13 ', 13 , A bell mouth 5 located outside the propeller fan 4 ′ to partition the suction area X and the blowout area Y, and a fan guard located on the blow-out side of the propeller fan 4 ′. 6, the blade 13 'has a radial cross-sectional shape that is all convex toward the suction side, and the blade 13' has an arbitrary radial cross-section passing through the center of rotation O of the propeller fan 4 '. An outer peripheral portion (in other words, a wing tip) P of 13 'is inclined toward the blowing side.

With the above construction, the outer peripheral portion of each blade 13 '(in other words, the wing tip) on the suction side.
The shape of P matches the outer peripheral suction flow w ₂ ′, and the growth of the tip vortex E ′ is suppressed. As a result, when incorporated into the blower 3, the turbulence e due to the collision between the tip vortex E 'and the fan guard 6 is reduced, the noise from the fan guard 6 is reduced, and the operating noise of the blower 3 is reduced. Reduction can be achieved.

Further, since the blade 13 'having the above structure is thin, material costs are easy, molding is easy, and recyclability is high.

Further, since the motor is lightweight and has a small load at the time of startup and variable speed control, the power consumption of the motor can be reduced and the energy saving performance can be improved.

(4) Invention of Claim 4 According to the invention of claim 4, as a means for solving the above-mentioned problem, the outer peripheral surface of the hub 14 which is the center of rotation has a thick wing shape represented by an airfoil wing. A plurality of blades 13, 13
And a fan guard 6 located outside the propeller fan 4 to partition the suction area and the blowout area, and a fan guard 6 located on the blowout side of the propeller fan 4. In the above each blade 1
The radial cross-sections of 3 are all convex on the suction side,
Further, at any radial cross-section passing through the rotation center O of the propeller fan 4 and passing through a predetermined point A to H on the outer periphery of each blade 13 and located in the rotation direction from the radial cross-section, the hub 14 side of each blade 13 Both the wing tip P side and the wing tip P side are inclined to the blowing side, and the closest points Q _{1 to} Q ₈ on the suction side are positioned at positions gradually moved from the hub 14 side to the wing tip P side as the cross section goes in the rotation direction. I have.

With the above configuration, the outer peripheral portion (in other words, the wing tip) P of each blade 13 is provided on the suction side.
Is matched with the outer peripheral suction flow w ₂ , so that the growth of the tip vortex E is suppressed, and
3 shape becomes good balanced, thereby improving the matching degree between tip leakage flow w ₁ inhibition and the outer suction flow w ₂ and the blade shape from the pressure surface 13a in the P to the negative pressure surface 13b. As a result, in the case where the blade tip vortex E and the fan guard 6 collide with each other, the disturbance e
Becomes smaller, the noise from the fan guard 6 is further reduced, and the operating sound of the blower 3 can be further reduced.

(5) Invention of Claim 5 According to the invention of claim 5, as a means for solving the above-mentioned problem, a plurality of thin plate-shaped blades 13 ', 13 ', A bell mouth 5 located outside the propeller fan 4' to partition the suction area and the blowout area, and a fan guard 6 located on the blowing side of the propeller fan 4 '. In the blower provided with the above, all the blades 13 'have a radial cross-sectional shape that is convex toward the suction side, and passes through the rotation center O of the propeller fan 4', and furthermore, the blades 13 '
Each of the blades 1 in any radial cross-section located in a rotational direction from a radial cross-section passing through predetermined points A to H on the outer circumference.
3 brought together inclined outlet side the side and tip P 'side hub 14' and the nearest point Q ₁ to Q ₈ in the suction side, the blade tip P from gradually hub 14 'side as cross section toward the rotational direction
It is located at the position moved to the side.

With the above construction, the outer peripheral portion of each blade 13 '(in other words, the blade tip) on the suction side.
The shape of P matches the outer peripheral suction flow w ₂ ′, so that the growth of the tip vortex E ′ is of course suppressed.
The shape of each blade 13 ′ is well-balanced, the leakage flow w ₁ ′ from the pressure surface 13 a ′ to the suction surface 13 b ′ at the blade tip P is suppressed, and the degree of matching between the outer peripheral suction flow w ₂ ′ and the blade shape is improved. Is improved. As a result, when incorporated in the blower 3, the turbulence e due to the collision between the tip vortex E ′ and the fan guard 6 becomes smaller, the noise from the fan guard 6 is further reduced, and the operation of the blower 3 The sound can be further reduced.

(6) Invention of Claim 6 As in the invention of Claim 6, Claims 1, 2, 3, 4
The blower according to any one of claims 5 and 5,
Each blade 13, 1 in the propeller fan 4, 4 '
When the trailing edge B of the blade 3 'is located on the same plane perpendicular to the center of rotation, the distance between the trailing edge B of each of the blades 13 and 13' and the fan guard 6 is on the side of the propeller fans 4 and 4 '. Since it is the same in all regions, noise from the fan guard 6 can be further reduced.

(7) Invention of Claim 7 As in the invention of Claim 7, Claims 1, 2, 3,
7. The blower according to any one of 4, 5, and 6, wherein the bell mouth 5 is provided with a suction-side arc portion 5a positioned on a suction side, a blow-side arc portion 5b positioned on a blow side, and the blow-out portion. And a rear end B of the propeller fans 4 and 4 ′, and a cylindrical portion 5 c of the bell mouth 5. The cylindrical portion 5 c is located between the side circular portion 5 b and the suction side circular portion 5 a. In this case, the backflow of the blowout flow from the propeller fans 4, 4 'in the vicinity of the blowout side arc portion 5b of the bell mouth 5 is suppressed,
Turbulence of the airflow due to the backflow is reduced. Therefore, it greatly contributes to the reduction of driving noise.

(8) Invention of Claim 8 As in the invention of Claim 8, Claims 1, 2, 3,
When the heat exchanger 2 is arranged on the suction side of the blower 3 according to any one of 4, 5, 6, and 7, and the outdoor unit for an air conditioner is configured, the operation noise is reduced. Thus, an outdoor unit for an air conditioner can be obtained.

[0029]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1) The blower 3 in this embodiment is used in the outdoor unit for an air conditioner shown in FIGS. 1 to 3 in the same manner as that described in the section of the prior art. And a plurality (for example, three) of blades 13, 13,
13, a propeller fan 4, a bell mouth 5 located outside the propeller fan 4 and separating the suction area X and the blowout area Y, and a fan guard 6 located on the blowout side of the propeller fan 4. It is configured.

In the outdoor unit for an air conditioner, a heat exchanger room 8 and a machine room 9 are formed by a partition plate 7 inside a casing 1 having a rectangular parallelepiped shape.
And air inlets 10, 10 formed in the back and one side of the casing 1 in the heat exchange chamber 8.
A heat exchanger 2 having an L-shaped cross section and a blower 3 located on the downstream side of the heat exchanger 2 are disposed, and a compressor 11 is disposed in the machine room 9. It is configured. Reference numeral 12 denotes a fan motor.

Each of the blades 13 may be an airfoil blade shown in FIG. 5A or a modified airfoil blade shown in FIGS. 5B to 5D. , A modified airfoil blade shown in FIG. 5B is employed as an example. As shown in FIG. 13, the shape of the blade tip P of the blade 13 is such that the pressure surface 13a side is cut into a substantially arc shape.
In this way, the wing tip vortex E that is formed by the leakage flow w ₁ and the outer peripheral side of the suction flow w ₂ leaking from the pressure surface 13a of the wing tip P as described earlier in the suction surface 13b occurs smoothly And the turbulence is reduced (see FIG.
reference).

By the way, the basic skeleton of the blade shape as described above is generally determined by, for example, the camber line L shown in FIG. The camber line L is an average line (average warp line) between the upper surface and the lower surface from the leading edge F to the trailing edge B of the blade 13. By performing the fleshing, the final blade shape is determined.

The radial cross section of each of the blades 13 in the present embodiment is, for example, as shown in FIGS. 10 to 13, from the hub 14 side to the blade tip P, all of which are convex toward the suction side. 13 (see the sled line La in FIG. 13), passes through the center of rotation O of the hub 14 (the center of rotation of the propeller fan 4), and at predetermined points A to H on the outer periphery of each blade 13.
Hub 1 of each of the blades 13 at any radial cross-section located in the rotation direction more than the radial cross-section OA-OH passing through
The four sides and the wing tip P side are both inclined to the blowing side. The closest points Q _{1 to} Q ₈ on the suction side of the cross section (that is, the points located closest to the suction side) gradually change from the hub 14 side to the blade tip P side as the position of the cross section moves in the rotation direction of the hub 14. It is located at the position moved to. In addition, the code | symbol N in FIG. 11 is a line which shows the chord length of the said blade | wing 13.

In the case of the above construction, on the suction side, the shape of the outer peripheral portion (in other words, the blade tip) P of each blade 13 matches the outer peripheral suction flow w ₂ (see FIG. 10). Of course, the growth of the edge vortex E is suppressed,
The shape of each blade 13 is well-balanced, and the wing tip P
Flow w from pressure surface 13a to suction surface 13b at
Matching degree between ₁ inhibition and the outer suction flow w ₂ and the blade shape is improved. As a result, when incorporated into the blower 3, the turbulence due to the collision between the tip vortex E and the fan guard 6 is further reduced, the noise from the fan guard 6 is further reduced, and the operating sound of the blower 3 is reduced. Further reduction can be achieved.

By the way, a comparison was made of the blowing sound between the outdoor unit for an air conditioner according to the present embodiment (the present invention) and the outdoor unit for an air conditioner equipped with a conventional propeller fan (conventional example). However, as shown in FIG. 16, the blowing sound of the outdoor unit for an air conditioner according to the present embodiment (product of the present invention) was reduced by about 1.2 dBA as compared with the conventional example.

In the present embodiment, as shown in FIG. 15, the bell mouth 5 includes a suction-side arc portion 5a located on the suction side and a blow-side arc portion 5b located on the blow side. The outlet side arc portion 5b and the suction side arc portion 5
a, and the rear edge B of the propeller fan 4 is located at a position corresponding to the cylindrical portion 5c of the bell mouth 5. By doing so, the backflow of the blowout flow from the propeller fan 4 in the vicinity of the blowout side arc portion 5b of the bell mouth 5 is suppressed, and the turbulence of the airflow due to the backflow is reduced. Therefore, it greatly contributes to the reduction of driving noise.

In the above embodiment, the radial cross section of each blade 13 is all convex toward the suction side, and passes through the rotation center O of the hub 14 (propeller fan 4). Hub 14 of each of the blades 13 at an arbitrary radial cross-section located in a rotational direction more than a radial cross-section OA-OH passing through predetermined points A to H on the outer circumference of the blade 13
Side and the wing tip P side are both inclined toward the outlet side, and the closest points Q _{1 to} Q ₈ on the suction side of the same cross section gradually move toward the hub 14 as the position of the same cross section moves toward the rotation direction of the hub 14. The blades 13 are positioned at positions shifted from the front end to the blade tip P side. However, the radial cross-sectional shape of each blade 13 is made convex at the suction side at all positions from the leading edge side to the trailing edge side, and the hub 14 (propeller). At an arbitrary radial section OA-OH passing through the rotation center O of the fan 4), the outer peripheral portion of each of the blades 13, that is, the blade tip P may be simply inclined toward the blowing side.

(Embodiment 2) The blower 3 in this embodiment is also similar to the air blower shown in FIGS. The configuration is the same as that used in the outdoor unit for the harmony device, except that the structure of the blades 13 ', 13',... Is a plate shape (thin wing).

In the configuration of the first embodiment, the blades 13 of the blower 3 are, for example, airfoil blades shown in FIG. 5 (a), and various shaped airfoils shown in FIGS. 5 (b) to 5 (d). By adopting any one of the blades and reducing the turbulence caused by the collision between the blade tip vortex E and the fan guard 6 when incorporated as the blower 3, the superior performance of the fan alone, which is a feature of the airfoil blade, While ensuring the performance, the noise from the fan guard 6 is reduced, and finally the operation sound of the blower itself is reduced.

Each of the blades 13 composed of the various airfoil blades is configured to realize such an operation and effect.
Are all convex in the suction side, and the outer peripheral portion (in other words, the blade tip) P of each of the blades 13 in any radial cross section passing through the rotation center O of the propeller fan 4 Adopted a configuration to incline to the blowing side.

When such a configuration is adopted, the outer peripheral portion of each blade 13 (in other words, its blade tip) P on the suction side
Shape becomes to match the outer peripheral suction flow w _2, growth of the wing tip vortex E is suppressed effectively. As a result, even when incorporated in the blower 3, the disturbance e due to the collision between the tip vortex E and the fan guard 6 is reduced, the noise from the fan guard 6 is reduced, and the operating noise of the blower 3 is reduced. And the original performance of the airfoil wing was effectively utilized.

By the way, with respect to the noise reduction effect at the time of assembling into such a blower, as described above, for example, a propeller fan having a thin plate-shaped blade 13 'as shown in FIG. In the case of 4 ', the airflow turbulence e' due to separation also occurs on the blade surface and the airflow turbulence e 'at the trailing edge B also increases when viewed from the performance of the fan alone. The fan performance of the propeller fan 4 is inferior.

However, when comparing the noise performance of each of the blowers incorporating them, the performance difference between the fans alone becomes small.

This is because the airfoil blade-shaped blade 1
In the case of the blower incorporating the propeller fan 4 having the blade 3, the blade tip vortex E generated at the blade tip P of the blade 13 is more stable than the blade tip vortex E ′ of the thin plate-shaped blade 13 ′. The size of the tip vortex E is the tip vortex E 'of the thin plate-shaped blade 13'.
Larger, for example, as shown in FIGS.
When the large wing tip vortex E collides with the fan guard 6, the air turbulence e becomes intense, and the noise generated from the fan guard 6 increases. On the other hand, the blade tip vortex E 'of the thin plate-shaped blade 13' is unstable and small, so that the air turbulence e at the time of collision with the fan guard 6 is gentle, and the noise generated from the fan guard 6 is small. Is also small.

That is, when compared with the conventional configuration,
At least when incorporated as the blower 3, the thin plate-shaped blades 13 'are not so inferior to airfoil blades, but rather have a cost advantage.

Therefore, if the inventors of the present application further improve the noise performance of the thin plate-shaped blade 13 ′, the first embodiment can be improved.
Assuming that it is possible to realize a blower having substantially the same noise performance at a lower cost as compared with the blade 13 having the airfoil blade structure, for example, as shown in FIG. Of the propeller fan 4 ', the blades 13', 13 ',.
On the other hand, as in the case of the first embodiment, the radial cross-sectional shape is all convex to the suction side, and any radial cross-section passing through the rotation center O of the propeller fan 4 '(the above-described radial cross-section). 11 and 12), the outer peripheral portion (in other words, the blade tip) P of each of the blades 13 ', 13',... Is inclined toward the blowing side similarly to the first embodiment. saw.

When viewed in this manner, the shape of the outer peripheral portion (in other words, the blade tip) P of each of the blades 13 ', 13',... Matches the outer peripheral suction flow w ₂ 'on the suction side. It has been found that the growth of the relatively small tip vortex E 'can be further suppressed. As a result, even when incorporated in the blower 3, the turbulence e due to the collision between the tip vortex E ′ and the fan guard 6 is further reduced, and the noise from the fan guard 6 is more effectively reduced. In addition, the operating noise of the blower 3 can be reduced.

Now, the noise reduction effect when such a propeller fan is incorporated in an outdoor unit for an air conditioner as a blower is shown in comparison with FIG. In FIG. 18, (a) shows a case of a thick-walled fan made of a conventional airfoil blade-shaped blade, (b) shows a case of a thin-walled fan made of a conventional thin plate-shaped blade, and (c) shows the above embodiment. In the case of the thick fan of No. 1, (d) is a characteristic (air volume-blowing sound characteristic) showing each noise reduction effect in the case of the thin fan composed of the thin plate-shaped blades 13 ', 13',. is there.

As is apparent from comparison of these characteristics, the thin fan (d) of the present embodiment is more integrated than the conventional thin fan (b) and the conventional thick fan (a). In addition to the high noise reduction effect at the time, the silent performance can be improved to a level substantially equal to that of the thick fan (c) of the first embodiment.

Moreover, since it is thin, material costs are easy, molding is easy, and recyclability is high.

Further, since it is lightweight and has a small load at the time of startup and variable speed control, the power consumption of the motor can be reduced and the energy saving performance can be improved.

[0053]

According to the first aspect of the present invention, the plurality of blades 13, 13 'are provided on the outer peripheral surfaces of the hubs 14, 14' serving as the center of rotation.
., Propeller fan 4, 4 'provided with 13', 13 '
A bell mouth 5 located outside the propeller fans 4 and 4 'to partition the suction area X and the blowing area Y; and a fan guard 6 located on the blowing side of the propeller fans 4 and 4'.
And the blades 13 and 13 '
Of the blades 13, 13 ′ (in other words, blades) in any radial cross section passing through the center of rotation of the propeller fans 4, 4 ′. and slant end) P on the outlet side, the suction side, 'if the outer peripheral portion (i.e., the tip) outer peripheral suction flow w _2, w ₂ P-shape' each blade 13, 13 is matched with the wings Since the growth of edge vortices E and E 'has been suppressed,
When incorporated in the blower 3, the tip vortex E,
Disturbance due to the collision between E ′ and the fan guard 6 is reduced, and noise from the fan guard 6 is reduced.
There is an effect that the driving noise of the vehicle can be reduced.

According to the second aspect of the present invention, a propeller fan 4 having a plurality of blades 13 having a thick wing shape represented by an airfoil blade on an outer peripheral surface of a hub 14 serving as a rotation center, In the blower device 3 including a bell mouth 5 located outside the propeller fan 4 to partition the suction area X and the blowing area Y, and a fan guard 6 located on the blowing side of the propeller fan 4, the blades 13 has a radial cross-sectional shape that is convex toward the suction side, and blows an outer peripheral portion (in other words, a blade tip) P of each of the blades 13 in an arbitrary radial cross-section passing through the rotation center of the propeller fan 4. The shape of the outer peripheral portion (in other words, the wing tip) P of each blade 13 is matched with the outer peripheral suction flow w ₂ on the suction side to suppress the growth of the wing tip vortex E.
When incorporated in the blower 3, the turbulence caused by the collision between the tip vortex E and the fan guard 6 is reduced, the noise from the fan guard 6 is reduced, and the operating noise of the blower 3 is reduced. There is an effect that can be.

According to the third aspect of the present invention, a plurality of thin plate-shaped blades 13 ',
13 '., A bell mouth 5 located outside the propeller fan 4' to partition the suction area X and the blowing area Y, and a fan located on the blowing side of the propeller fan 4 '. In the blower provided with the guard 6, all the blades 13 ′ have a radial cross-sectional shape that is convex toward the suction side, and each of the blades 13 ′ has an arbitrary radial cross-section passing through the rotational center O of the propeller fan 4 ′. Feather 1
The outer peripheral portion (in other words, the wing tip) P of 3 ′ is inclined toward the outlet side, and the shape of the outer peripheral portion (in other words, the wing tip) P of each blade 13 ′ is changed to the outer peripheral suction flow w ₂ on the suction side. And the growth of the wing tip vortex E 'was suppressed,
When incorporated in the blower 3, the turbulence e due to the collision between the tip vortex E 'and the fan guard 6 is reduced,
There is an effect that the noise from the fan guard 6 is reduced and the operation sound of the blower 3 can be reduced.

Moreover, since the blade 13 'of this configuration is thin, the material cost is easy, the molding is easy, and the recyclability is high.

Further, since it is lightweight and has a small load at the time of startup and variable speed control, the power consumption of the motor can be reduced and the energy saving performance can be improved.

According to the fourth aspect of the present invention, the propeller fan 4 has a plurality of thick blade-shaped blades 13, 13. And a bell mouth 5 located outside the propeller fan 4 and separating the suction area and the blowout area, and a fan guard 6 located on the blowout side of the propeller fan 4. Are all convex to the suction side, and are located in the rotational direction from the radial cross section passing through the rotation center O of the propeller fan 4 and passing through predetermined points A to H on the outer periphery of each blade 13. In any radial cross section, the hub 14 side and the blade tip P side of each blade 13 are both inclined toward the blowing side,
The closest points Q _{1 to} Q ₈ on the suction side are gradually located at positions shifted from the hub 14 side to the blade tip P side as the cross section goes in the rotation direction, and the outer peripheral portion of each blade 13 (in other words, If the shape of the wing tip) P is the outer peripheral suction flow w ₂
And the shape of each blade 13 is well-balanced, and the pressure surface 13a at the blade tip P
Since the degree of matching between leakage flow w ₁ inhibition and the outer suction flow w ₂ and the blade shape is so as to improve the 3b, when incorporated into a blower 3, tip vortex E
The disturbance e due to the collision between the fan guard 6 and the fan guard 6 is further reduced, the noise from the fan guard 6 is further reduced, and the operating noise of the blower 3 can be further reduced.

According to the fifth aspect of the present invention, a plurality of thin plate-shaped blades 13 ',
13 '., A propeller fan 4', a bell mouth 5 located outside the propeller fan 4 'to partition the suction area and the blowout area, and a fan guard 6 located on the blowout side of the propeller fan 4'. In the blower provided with the above, the radial cross-sectional shape of each of the blades 13 ′ is all convex toward the suction side, and passes through the rotation center O of the propeller fan 4 ′, and furthermore, a predetermined shape around the outer periphery of each of the blades 13 ′. Point A ~
And slant to both the blowing side of the side and tip P 'side hub 14' of any radial said in cross-section each blade 13 positioned in the rotation direction than the radial cross-section through H, the nearest point on the suction side Q ₁ ＱQ ₈ is gradually moved from the hub 14 ′ side to the blade tip P side as the cross section goes in the rotation direction, and the outer peripheral portion of each blade 13 ′ (in other words, the blade tip) on the suction side. The shape of P matches the outer peripheral suction flow w ₂ ′, so that the growth of the blade tip vortex E ′ is suppressed, and the shape of each blade 13 ′ is well-balanced, and the pressure at the blade tip P Since the leakage flow w ₁ ′ from the surface 13 a ′ to the negative pressure surface 13 b ′ is suppressed and the degree of matching between the outer peripheral suction flow w ₂ ′ and the blade shape is improved, when incorporated into the blower 3, , The tip vortex E ' Turbulence e due to the collision of the Ngado 6
Is smaller, the noise from the fan guard 6 is further reduced, and the operating noise of the blower 3 can be further reduced.

As in the sixth aspect of the present invention, in the blower according to any one of the first, second, third, fourth, and fifth aspects, each of the blades 13, 13 'in the propeller fans 4, 4' is provided. When the trailing edge B is positioned on the same plane orthogonal to the rotation center, the distance between the trailing edge B of each of the blades 13, 13 ′ and the fan guard 6 is equal to the propeller fan 4,
The same applies to the entire area of the blow-out side 4 ', so that noise from the fan guard 6 can be further reduced.

As in the invention of claim 7, in the blower according to any one of claims 1, 2, 3, 4, 5, and 6, the bell mouth 5 is located on the suction side. Side arc portion 5a, a blow side arc portion 5b located on the blow side, the blow side arc portion 5b, and the suction side arc portion 5a.
When the rear edge B of the propeller fans 4, 4 ′ is located at a position corresponding to the cylindrical portion 5 c of the bell mouth 5, the propeller The backflow of the blowout flows from the fans 4 and 4 'in the vicinity of the blowout side arc portion 5b of the bell mouth 5 is suppressed, and the turbulence of the airflow due to the backflow is reduced.
Therefore, it greatly contributes to the reduction of driving noise.

As in the invention of claim 8, the heat exchanger 2 is arranged on the suction side of the blower 3 according to any one of claims 1, 2, 3, 4, 5, 6 and 7. When the outdoor unit for an air conditioner is configured to be installed, an outdoor unit for an air conditioner having a quiet operation sound can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a general outdoor unit for an air conditioner.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a partially enlarged cross-sectional view for explaining an interference state between an airflow blown from a propeller fan and a fan guard.

FIG. 5A is a cross-sectional view of an airfoil wing, and FIGS.
(D) is a sectional view of three types of irregularly shaped airfoil blades.

FIG. 6A is an explanatory diagram showing a state of an airflow around an airfoil blade, and FIG. 6B is an explanatory diagram showing a state of an airflow around a thin plate blade.

FIG. 7A is a cross-sectional view illustrating a state of formation of a tip vortex in a propeller fan having airfoil blade-shaped blades, and FIG. 7B is a cross-sectional view illustrating a state of a blade tip vortex in a propeller fan having thin-plate blade-shaped blades. It is sectional drawing which shows a formation state.

FIG. 8 is an enlarged perspective view showing a state in which a blade tip vortex is formed in a blower including a propeller fan having airfoil blade-shaped blades.

FIG. 9 is a partially enlarged view for explaining an interference state between an airflow blown from a propeller fan and a fan guard in an outdoor unit for an air conditioner using a blower having a propeller fan having airfoil blade-shaped blades. It is sectional drawing.

FIG. 10 is an enlarged cross-sectional view of a main part (blades) of the propeller fan used in the blower according to the first embodiment of the present invention.

FIG. 11 is a front view of a main part of the propeller fan used in the blower according to the first embodiment of the present invention.

FIG. 12 is a half sectional view (a partially cutaway sectional view) of a main part of a propeller fan used in the blower according to the first embodiment of the present invention;

FIG. 13 is a half sectional view (partially cutaway sectional view) for explaining a mode of blade formation of the propeller fan used in the air blower according to the first embodiment of the present invention.

FIG. 14 is a sectional view of a blade of a propeller fan used in the blower according to the first embodiment of the present invention.

FIG. 15 is an explanatory diagram for explaining a relationship between a propeller fan and a bell mouth used in the blower according to the first embodiment of the present invention;

FIG. 16 shows the relationship between the air volume and the airflow noise between an air conditioner outdoor unit using a blower according to the first embodiment of the present invention and an air conditioner outdoor unit using a conventional blower. It is a characteristic diagram.

FIG. 17 is an enlarged sectional view of a main part of a propeller fan used in the blower according to the second embodiment of the present invention.

FIG. 18 is a graph showing the relationship between the air volume and the airflow noise between the air conditioner outdoor unit using the blower according to the first and second embodiments of the present invention and the air conditioner outdoor unit using the conventional blower. FIG. 4 is a characteristic diagram illustrating a relationship.

[Explanation of symbols]

2 is a heat exchanger, 3 is a blower, 4 and 4 'are propeller fans, 5 is a bell mouth, 5a is a suction side arc, 5b is a blow side arc, 5c is a cylinder, 6 is a fan guard, and 13 and 1
3 'is a blade, 14, 14' are hubs, A to H are predetermined points,
E, E 'is tip vortex, F is the leading edge, B is trailing, O is the center of rotation, P is the blade tip, Q ₁ to Q ₈ are suction side closest point (i.e., point located most suction side) .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F04D 29/54 F04D 29/54 D 29/66 29/66 MF Term (Reference) 3H022 AA03 AA05 BA01 BA04 CA49 DA11 3H033 AA02 AA18 BB02 BB08 BB20 CC01 CC03 DD03 DD29 EE06 EE08 3H034 AA02 AA18 BB02 BB08 BB20 CC01 CC03 DD12 DD28 EE06 EE08 3H035 CC01 CC07 3L054 BA03 BA04 BA06 BA10

Claims (8)

[The claims] The hub (14), (1)
4 ′), a plurality of blades (13), (13),.
(13 ′), (13 ′) · formed propeller fans (4) and (4 ′), and the propeller fans (4),
A bell mouth (5) positioned on the outer peripheral side of (4 ') to separate the suction area (X) and the blow-out area (Y), and a fan positioned on the blow-out side of the propeller fans (4) and (4') A blower provided with a guard (6), wherein each of the blades (1)
3) and (13 ') all have a radial cross section that is convex toward the suction side, and the propeller fan (4)
The blower according to (4 '), wherein the blade end (P) of each of the blades (13) and (13') is inclined toward the blowout side in an arbitrary radial cross section passing through the center of rotation of (4 '). 2. A propeller fan (4) having a plurality of thick blade-shaped blades (13) (13) formed on an outer peripheral surface of a hub (14) serving as a center of rotation. A bell mouth (5) positioned on the outer peripheral side of the propeller fan (4) to partition the suction area (X) and the blow-out area (Y); and a fan guard positioned on the blow-out side of the propeller fan (4). 6), wherein each of the blades (13) has a radial cross-sectional shape that is all convex toward the suction side, and has an arbitrary radial direction passing through the rotation center of the propeller fan (4). Each of the blades (1
The blower according to (3), wherein the wing tip (P) is inclined toward the blowing side. 3. A propeller fan (4 ') having a plurality of thin plate-shaped blades (13') and (13 ') formed on an outer peripheral surface of a hub (14') serving as a rotation center, and a propeller fan (4 '). A bell mouth (5) positioned on the outer peripheral side of 4 ') to separate the suction area (X) and the blowing area (Y); and a fan guard (6) positioned on the blowing side of the propeller fan (4'). A radial cross-section of each of the blades (13 ') which is all convex toward the suction side and which passes through the center of rotation of the propeller fan (4'). The air blower according to any one of claims 1 to 3, wherein a blade tip (P) of each of the blades (13 ') is inclined toward a blowing side. 4. A propeller fan (4) having a plurality of thick wing-shaped blades (13) (13), typified by airfoil blades, formed on an outer peripheral surface of a hub (14) serving as a rotation center. A blower provided with a bell mouth (5) located outside the propeller fan (4) to separate the suction region and the blowout region, and a fan guard (6) located on the blowout side of the propeller fan (4). An apparatus, wherein each of the blades (1)
3) All of the radial cross-sectional shapes are convex toward the suction side, and pass through the center of rotation (O) of the propeller fan (4), and are at predetermined points (A) to (A) on the outer periphery of each blade (13).
Hub (1) of each said blade (13) at any radial cross-section located in the rotational direction from the radial cross-section passing through (H).
4) Both the wing tip (P) side and the wing tip (P) side are inclined toward the outlet side, and the nearest points (Q ₁ ) to (Q ₈ ) on the suction side gradually become closer to the hub (14) as the cross section goes in the rotation direction. Characterized in that the blower is located at a position moved to the wing tip (P) side from the side. 5. A propeller fan (4 ') having a plurality of thin plate-shaped blades (13') and (13 ') formed on an outer peripheral surface of a hub (14') serving as a center of rotation, and a propeller fan (4 '). 4 ') is a blower including a bell mouth (5) positioned outside the suction area and the blow-out area, and a fan guard (6) positioned on the blow-out side of the propeller fan (4'). The radial cross section of each of the blades (13 ') is all convex toward the suction side, passes through the center of rotation (O) of the propeller fan (4'), and furthermore, the outer periphery of each of the blades (13 ') In any radial cross-section located in the rotation direction from the radial cross-section passing through the predetermined points (A) to (H), the hub (14 ') side and the blade tip (P) side of each said blade (13') Are both inclined to the outlet side, and the closest points (Q ₁ ) to ( Q ₈ ), wherein the air blower is located at a position where the section gradually moves from the hub (14 ′) side to the blade tip (P) side as the cross section goes in the rotation direction. 6. A trailing edge (B) of each of the blades (13) and (13 ') in the propeller fans (4) and (4') is located on the same plane orthogonal to the rotation center (O). The blower according to any one of claims 1, 2, 3, 4, and 5, wherein the blower is provided. 7. The bell mouth (5) includes a suction side arc portion (5a) positioned on the suction side, a blow side arc portion (5b) positioned on the blow side, and a blow side arc portion (5b). A cylindrical portion (5c) positioned between the suction side arc portion (5a) and the propeller fan (4);
5. The method according to claim 1, wherein the trailing edge of the bell mouth is located at a position corresponding to the cylindrical portion of the bellmouth. The blower according to any one of claims 5 and 6. 8. A heat exchanger (2) is arranged on the suction side of the blower (3) according to any one of claims 1, 2, 3, 4, 5, 6, and 7. An outdoor unit for an air conditioner, comprising: