JP2000018198A - Blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of back flow in the air intake region at the bell mouth at which the ventilation resistance generated by non axially- symmetric flow on the air blowoff side in a blower having a ventilation passage wherein the air blowoff flow becomes non axially-symmetric due to a high passage resistance in a predetermined region in circumferential direction on air blowoff side. SOLUTION: A blower 5 is provided with a bell mouth 6 and a flow in circumferential direction on air blowoff side is applied to an air blowoff passage wherein a flow becomes non axially-symmetric due to the difference in ventilation resistance. A shape of the bell mouth 6 is changed according to the non axially-symmetric flow in circumferential direction on air blowoff side so as to prevent the generation of back flow in the air intake region of the bell mouth at which the ventilation resistance is high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an air conditioner and other blowers in which the flow in the circumferential direction on the air outlet side is not axially symmetric.

[0002]

2. Description of the Related Art In conventional air conditioners (outdoor units and indoor units), for example, an air inlet is provided on the front surface of a box-shaped main body casing and an air outlet is provided on the upper surface side.
The air sucked in from the air inlet on the front side by a blower such as an axial fan or a centrifugal fan provided inside is blown upward from the air outlet on the upper surface side of the main body casing through a heat exchanger. There is something.

FIGS. 16 and 17 show an example of the structure of such an air conditioner (outdoor unit).

In the figure, reference numeral 1 denotes a main body casing of the air conditioner, and the main body casing 1 is thin in the front-rear direction.
It is configured in a box-shaped shape whose length in the vertical direction is slightly longer than the width in the horizontal direction. An air suction port 3 is formed on substantially the entire surface except for a portion corresponding to the machine room 2 (2A is a compressor) on the right side on the front side, and air heat exchange is provided inside the air suction port 3. A vessel 4 is provided corresponding to the entire surface.

The air suction port 3 is connected to the air heat exchanger 4
Of the bellows 6 of the mixed flow fan 5 provided at the back of the bellows 6 and extends substantially horizontally in the direction of the fan guide port 6b from the air suction opening 6a. Then, for example, the wing 5 of the mixed flow fan 5 is inserted into the fan guide opening 6 b of the bell mouth 6.
a is rotatably provided, and its hub portion 5b is rotatably supported via a motor shaft 7a of the fan motor 7. The bellmouth 6 is attached to a partition plate 16 having a vertical wall structure.

The fan motor 7 is mounted on the main body casing 1.
Of the rear plate 1a. As shown, the bell mouth 6 and the partition plate 16 and the back plate 1a are located between the mixed flow fan 5 and the back plate 1a.
An air blowing passage 11 extending upward from the air blowing opening 6c of the bell mouth 6 is formed between "a" and "a".

Then, the upper surface 1b of the main body casing 1
Is provided with an air outlet 13 corresponding to the air outlet passage 11.

Therefore, in this configuration, when the mixed flow fan 5 is rotationally driven, air is sucked from the air suction port 3 by the mixed flow fan 5, and is passed through the air heat exchanger 4 and the mixed flow fan 5. The air is blown almost uniformly in the outer circumferential direction, and the blown air flows from the air blowing passage 11 to the upper air outlet 1.
3 is blown out.

In the bell mouth 6 of the conventional mixed flow fan 5, for example, as shown in detail in FIG. 23, the overall height L from the air suction opening 6a to the air blowing opening 6c. And the radius of curvature R is constant (L ₁ = L ₂ , R ₁ =
The so-called axially symmetric shape of R ₂ ) has been used (for example, see the configuration of FIG. 4 in Japanese Patent Application Laid-Open No. 5-44694).

[0010]

However, in the circumferential area of the air-blowing-side ventilation passage such as the air conditioner described above, the air blowing area to the lower side is closed, and only the air blowing area to the upper side is closed. When the above-mentioned axisymmetric bell mouth 6 is used in the main body casing 1 in which the bellows 6 are opened, the tip of the wing 5a and the bell mouth 6
There is a problem that a back flow occurs between the air suction opening 6a and the air suction opening 6a.

Now, for example, in the mixed flow fan 5 in the outdoor unit main body casing 1 as shown in FIGS.
When the air blowing region is divided into a high static pressure side and a low static pressure side by the bell mouth 6 and the partition plate 16, the following relationship is generally established between the flow pattern flowing in the wing 5a and the air volume. It has been.

In other words, the flow pattern in the wing portion 5a is, for example, as shown in FIG.
0 to change as indicated by the arrow in FIG. That is, at the time of the small air volume, the flow is directed from the hub 5b side to the outer peripheral direction, and a backflow region is easily generated between the tip of the blade 5a and the air suction opening 6a side of the bell mouth 6 (see FIG. 20). On the other hand, when the air volume is large, the flow tends to move from the outer peripheral direction to the hub 5b (see FIG. 22). On the other hand, when the average air volume is the medium air volume, the flow becomes stable (see FIG. 21).

Therefore, when the static pressure distribution is the same in the entire circumferential direction, the height L of the bell mouth 6 is uniformly changed in the circumferential direction (while maintaining the axial symmetry) to prevent the backflow. Thus, it is possible to prevent an increase in blowing noise.

However, when the diagonal fan 5 is used for the air blowing passage 11 in a box body such as a main body casing that is closed at least in one circumferential direction on the air blowing side as described above. The ventilation resistance increases in the lower passage portion where the blowing side is closed. Conversely, in the upper portion where the air blowing side is open, the passage resistance decreases. That is, the static pressure distribution in the circumferential direction on the air blowing side is not uniform, and a high static pressure portion and a low static pressure portion are partially formed. Therefore, as compared with the case of the average air flow as shown in FIG.
The air volume increases in the low static pressure portion in the circumferential direction on the air blowing side.
At this time, looking at the flow in the blade 5a of the mixed flow fan 5,
As in the case of FIG. 20, the tip of the wing 5a and the bell mouth 6
A backflow region is generated between the air suction opening 6a and the air suction opening 6a,
The blowing noise becomes relatively large compared to the average value.

In connection with such a problem, for example, as shown in FIGS. 18 and 19, a gap 9 having a predetermined width is left below the mixed flow fan 5 having the above structure and the back plate 1a. A separator 10 is provided extending to the vicinity of the upper surface 1b of the main body casing 1. The separator 10 extends upward from the air outlet opening 6c of the bell mouth 6 between the bell mouth 6 and the partition plate 16 and the back plate 1a. A first air blowing passage 11a and a second air blowing passage 12a extending temporarily downward from the air blowing opening 6c of the bell mouth 6 and then extending upward from the gap 9 below the separator 10 are formed. At the same time, on the upper surface 1b of the main body casing 1, these first and second air
1st, 2nd air outlet 13 corresponding to 1a, 12a
With the provision of the a and 14a, the downward blow air, which is likely to cause the backflow, is led to the upper side as smoothly as possible by the second air blow passage 12a.

However, even if such a configuration is employed, it is not possible to sufficiently prevent the backflow caused by the above-described circumstances.

The present invention has been made in order to solve the above-mentioned problems. In a blower applied to a blower passage having a high passage resistance in a predetermined area in a circumferential direction on the air blowout side, the air blower on the air blowout side is provided. It is an object of the present invention to provide a blower that solves the above problem by using a bell mouth having a non-axisymmetric shape corresponding to a non-axisymmetric flow.

[0018]

Means for Solving the Problems In order to achieve the above objects, the inventions of the present application are provided with the following means for solving the problems.

(1) The blower according to the present invention has a bell mouth 6 and is applied to the air blowing passages 11 and 12 in which the circumferential flow on the air blowing side is a non-axisymmetric flow. The blower 5 is characterized in that the shape of the bell mouth 6 is modified to correspond to the non-axisymmetric flow in the circumferential direction on the air blowing side.

Therefore, due to the deformation of the bell mouth 6, the flow pattern in the blade 5a of the blower 5 can be made to correspond to the distribution pattern of the ventilation resistance on the air blowing passages 11 and 12, and Can hardly occur.

(2) The blower according to the second aspect of the present invention, in the blower according to the first aspect of the present invention, the bell mouth 6 is deformed by increasing the height L in the air suction side direction. It is characterized by the following.

When the height L of the bell mouth 6 is increased as described above, the air flow velocity at the portion where the height L is high is improved, and the backflow can be hardly generated.

(3) The blower according to the third aspect of the present invention is the blower according to the first aspect of the invention, wherein the bell mouth 6 in the configuration according to the first aspect of the present invention has a height L partially increased in the air suction side direction. It is characterized by being.

When the height L of the bell mouth 6 is partially increased as described above, the air flow velocity at the portion where the height L is high can be improved, and the backflow can be suppressed.

(4) The blower according to the fourth aspect of the present invention is the blower according to the first aspect of the invention, wherein the bell mouth 6 in the configuration according to the first aspect of the present invention has the height L continuously increased in the air suction side direction. It is characterized by being.

When the height L of the bell mouth 6 is continuously increased in the direction of the air suction side as described above, the air flow velocity at the portion where the height L is high can be improved, and the backflow can be suppressed.

(5) The blower according to the fifth aspect of the present invention provides the blower according to the first aspect of the present invention, wherein the shape of the bell mouth 6 in the configuration according to the first aspect of the invention is changed by the air intake opening 6a.
It is characterized in that the curvature radius R of the portion is changed.

When the radius of curvature R of the air inlet opening 6a of the bell mouth 6 is changed as described above, the air suction flow rate at the air suction opening can be varied, and the backflow can be suppressed.

(6) The blower according to the sixth aspect of the present invention is the blower according to the first, second, third, fourth or fifth aspect.
In the configuration of the present invention, the air blowing passages 11 and 12 having a passage structure in which the flow in the circumferential direction on the air blowing side is non-axisymmetric are provided with a box-shaped main casing 1 and an air suction provided on the front side of the main casing 1. The above-mentioned air conditioner of the air conditioner including the port 3, a heat exchanger 4 provided inside the air suction port 3, and a blower 5 provided behind the heat exchanger 4 via a bell mouth 6. The air blow passages 11 and 12 are located behind the blower 5 and are provided from the lower side to the upper side.

Therefore, in this configuration, the flow in the circumferential direction on the air blowing side of the blower in the box-shaped main casing 1 of the air conditioner whose upper side is open while the lower side is closed as described above. In the air blowing passages 11 and 12 having a non-axisymmetric flow structure, the shape of the bell mouth 6 is changed to a non-axisymmetric flow pattern in the circumferential direction on the air blowing side, that is, the ventilation of the air blowing passages 11 and 12. It can be made to correspond to the resistance distribution pattern, and the backflow can be made hard to occur as in the above-described respective cases.

(7) The blower according to the seventh aspect of the present invention, in the blower according to the sixth aspect of the present invention, further comprises the air blowing passages 11, 12 provided with a separator 10, which is divided by the separator 10. A first air blowing passage 11 for blowing air blown upward from the blower 5 upward, and a second air blowing passage for leading air blown downward from the blower 5 upward. 12 is formed from two passages.

Therefore, similarly to the sixth aspect of the present invention, the shape of the bell mouth 6 is changed corresponding to the non-axisymmetric flow in the circumferential direction on the air blowing side, so that the flow in the blade 5a of the blower 5 is increased. The pattern of air outlet passages 11 and 1
In addition to being able to correspond to the distribution pattern of the ventilation resistance on the two sides, it is possible to make it difficult for backflow to occur, and to further derive air from the second air blowing passage 12 divided by the separator 10. Since the action occurs, the backflow is less likely to occur.

(8) The invention according to claim 8 The blower according to the present invention provides the blower according to claims 1, 2, 3, 4, 5, and 6.
The blower 5 in the configuration of the invention of 6 or 7 is a mixed flow fan 5
It is characterized by comprising.

Therefore, claims 1, 2, 3, 4,
In the configuration of each of the inventions of 5, 6, or 7, the blower 5
When the mixed flow fan 5 which blows air in the circumferential direction is adopted as the above, the shape of the bell mouth 6 is changed to correspond to the non-axisymmetric flow in the circumferential direction of the air blow side, thereby forming the mixed flow fan. 5 can correspond to the distribution pattern of the ventilation resistance on the side of the air blowing passages 11 and 12, and the backflow can be made difficult to occur.

(9) The invention according to claim 9 The blower according to the present invention provides the blower according to claims 1, 2, 3, 4, 5, and 6.
The blower 5 in the configuration of the invention according to 6 or 7 is characterized by comprising an axial fan.

Therefore, the first, second, third, fourth and fourth aspects of the present invention are described.
In the configuration of each of the inventions of 5, 6, or 7, the blower 5
By adopting an axial fan from which air is blown out in the axial direction as described above, the shape of the bell mouth 6 is changed in accordance with the non-axisymmetric flow in the circumferential direction of the air blowing side to thereby provide the axial fan. The flow pattern in the wing can be made to correspond to the distribution pattern of the ventilation resistance on the side of the air blowing passages 11 and 12, and the backflow can be hardly generated.

[0037]

As described above, according to the blower of the present invention, partial backflow can be prevented from occurring.
The required rotation speed of the fan itself is reduced, and the blowing noise is reduced.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIGS.
1 shows a configuration of an air conditioner outdoor unit according to Embodiment 1 of the present invention configured by applying a blower of the present invention.

In the figure, reference numeral 1 denotes a main body casing of the outdoor unit. The main body casing 1 is formed in a box shape which is thin in the front-rear direction and slightly longer in the vertical direction than in the horizontal direction. ing. An air inlet 3 is formed on substantially the entire surface except for the right machine room 2 (2A is a compressor) on the front side, and an air heat exchanger 4 is provided inside the air inlet 3. , Corresponding to the entire surface.

The air inlet 3 is connected to the air heat exchanger 4
Of the bellows 6 of the mixed flow fan 5 provided at a position behind the air inlet opening 6a in the direction of the fan guide opening 6b. And the bellmouth 6
The blade portion 5a of the mixed flow fan 5 is rotatably provided in the fan guide opening 6b of the fan motor 7 and the hub portion 5b of the fan 5a.
Of the motor shaft 7a. The bellmouth 6 is attached to a partition plate 16 having a vertical wall structure.

The fan motor 7 is mounted on the main body casing 1.
Of the rear plate 1a. Further, a separator 10 is provided between the mixed flow fan 5 and the back plate 1a, which extends to the vicinity of the upper surface 1b of the main body casing 1, leaving a gap 9 having a predetermined width below, as shown in the figure. And the bell mouth 6 by the separator 10.
And a first air outlet passage 11a extending upward from the air outlet 6c of the bell mouth 6 between the partition plate 16 and the back plate 1a and an air outlet 6c of the bell mouth 6 extending downward once, and thereafter And a second air blowing passage 12a extending upward from the gap 9 below the separator 10.

Then, the upper surface 1b of the main body casing 1
From the first and second air outlet passages 11
a, 12a corresponding to the first and second air outlets 13a,
14a is provided.

Therefore, in this configuration, when the mixed flow fan 5 is driven to rotate, air is sucked from the air suction port 3 by the mixed flow fan 5, and is passed through the air heat exchanger 4 and the mixed flow fan 5. The blow-off flow excluding the blow-off wind downward from the first air outlet passage 11a to the first air outlet 13
a above the separator 1
0 through the gap 9 below the second air blowing passage 12a.
From the second air outlet 14a.

By the way, the bell mouth 6 closes the lower side of the air blowing side as described above, and blows the air blown out from the mixed flow fan 5 in the main body casing 1 whose upper side is open. For example, as shown in detail in FIGS. 3 and 4, a predetermined size ΔL (ΔL = L ₂ −L ₁ ) protrudes in the direction of the air suction port 3 in order to prevent a backflow state in the air suction area. A convex portion 15 having a round surface shape is provided. The convex portion 15 is provided, for example, in the blow-out region below the mixed flow fan 5.
30 ° left and right with respect to the vertical axis of
0 °).

As described above, when the flow pattern in the wing portion 5a differs in the vertical direction due to the positional relationship between the mixed flow fan 5 in the main body casing 1 and the air outlets 13a, 14a, as described above. By providing the convex portion 15 on the bell mouth 6, the shape of the bell mouth 6 is changed according to the flow pattern at that position. Flow to the side of the air blowing passage 12a becomes smooth, and the occurrence of backflow can be prevented, so that noise at the time of blowing can be reduced.

[0046] Now example, the upper side L ₁ of the height L of the air intake opening 6a side from the air outlet opening 6c side of the bell mouth 6, the lower side (the height of the convex portion 15) is L ₂ As
As shown in FIG. 1, FIG. 6 and FIG. 7, the position is sequentially changed from below the center axis OO 'to 0 °, 45 °, ± 90 ° in the counterclockwise direction, and the range of about 60 ° is as described above. in the convex portion 15 is provided, 33% than the height L ₁ of the height L ₂ of the convex portion 15 above the upper side _{(L 1 = 60mm, L 2} = 60 × 0.33 ≒ 80m
m, ΔL = 20 mm) Using the raised bell mouth 6,
The effect was confirmed.

[0047] As a result, for example, FIG. 8, as shown in FIG. 9, the main body casing 1 when the height L of the bell mouth 6 of the lower part tried backflow prevention measures by increasing the L ₁ to L ₂ The rotational speed and noise of the fan are lower in each case than in the case of using the axisymmetric bell mouth as shown in FIGS. 14, 15 and 16 and 17 in the prior art. In the embodiment (0 °), the number of rotations of the fan is reduced by 2%, and the blowing noise is reduced by 0.7 dBA.
The decrease was the largest. Also, as shown in FIGS. 1, 6, and 7, the center position at which the height L of the bell mouth 6 is increased is sequentially increased (the center axis lower position = 0 ° → 45 ° → 90 °).
Moving to the side, the effect decreases as it moves upward (see FIG. 8). Therefore, the position (0 °) below the central axis OO ′ as shown in FIG. 1 and FIG. And
It was confirmed that the greater the effect of preventing the backflow, the lower the rotational speed of the wing portion 5a, and the greater the effect of lowering the blowing noise.

The separator 10 in the above configuration is
Can further provide a round surface for deriving the air flow at the lower end portion, so that the air deriving action to the upper side is improved.

(Embodiment 2) FIG. 10 and FIG.
9 shows a configuration of an air conditioner outdoor unit according to Embodiment 2 of the present invention configured by applying the blower of the present invention.
In this embodiment, the air outlet is limited to only the upper surface side of the main body casing 1, and correspondingly, the convex portion 15 is provided on substantially the entire lower portion of the bell mouth 6 (a range of approximately 160 °). It is a feature.

In the figure, reference numeral 1 denotes a main body casing of the outdoor unit. The main body casing 1 is formed in a box shape having a small thickness in the front-rear direction and a slightly longer length in the vertical direction than in the left-right direction. ing. An air suction port 3 is formed on substantially the entire surface except for the machine room 2 on the right side on the front side, and an air heat exchanger 4 is provided inside the air suction port 3.
It is provided corresponding to the entire surface.

The air inlet 3 is connected to the air heat exchanger 4
Of the bellows 6 of the mixed flow fan 5 provided at a position behind the air inlet opening 6a in the direction of the fan guide opening 6b. And the bellmouth 6
The blade portion 5a of the mixed flow fan 5 is rotatably provided in the fan guide opening 6b of the fan motor 7 and the hub portion 5b of the fan 5a.
Of the motor shaft 7a. The bellmouth 6 is attached to a partition plate 16 having a vertical wall structure.

The fan motor 7 is mounted on the main casing 1.
Of the rear plate 1a. As shown, the bell mouth 6 and the partition plate 16 and the back plate 1a are located between the mixed flow fan 5 and the back plate 1a.
An air blowing passage 11 extending upward from the air blowing opening 6c of the bell mouth 6 is formed between "a" and "a".

Then, the upper surface 1b of the main body casing 1
Only the air outlet 13 corresponding to the air outlet passage 11
Is provided.

Therefore, in this configuration, when the mixed flow fan 5 is driven to rotate, air is sucked from the air suction port 3 by the mixed flow fan 5, and is passed through the air heat exchanger 4 and the mixed flow fan 5. Thus, the blowout flow including the blown air blown downward is blown from the air blowout passage 11 to above the air blowout opening 13.

In the case of this embodiment, the lower portion of the air blowing side as described above closes substantially the entire lower portion (in a range of approximately 160 °) of the bell mouth 6 and only the upper surface side of the main casing 1 is closed. In order to prevent a backflow area from being formed between the tip of the blade 5a of the mixed flow fan 5 and the air suction opening 6a of the bell mouth 6 in the main body casing 1 in which is opened, for example, FIGS. As is understood from FIG. 11, similarly to the first embodiment, a convex portion 15 having a round surface shape is provided which projects a predetermined dimension ΔL in the direction of the air suction port 3. Approximately 1 installation area
The angle of 60 ° corresponds to, for example, a blow-out area on the lower side of the mixed flow fan 5.

As described above, when the flow pattern in the wing portion 5a differs in the vertical direction due to the positional relationship between the mixed flow fan 5 in the main body casing 1 and the air outlet 13, the convexity as described above is obtained. By providing the portion 15, the shape of the bell mouth 6 is changed according to the flow pattern at that position, and if the whole shape of the bell mouth 6 is made non-axisymmetric, the lower portion of the air outlet passage 11 having a large ventilation resistance is provided. The flow from the side becomes smooth, and the generation of the backflow can be prevented, and the noise at the time of blowing can be reduced.

In this embodiment, as in the first embodiment, a gap 9 having a predetermined width is left below the main casing 5 between the mixed flow fan 5 and the back plate 1a. Although the separator 10 extending to the vicinity of the upper surface 1b of the first plate 1 is not provided, the same separator 10 is also provided in this embodiment, and the bell mouth 6 and the partition plate 16 and the rear plate 1a are provided by the separator 10. The first air outlet passage 11a extending upward from the air outlet 6c of the bell mouth 6 and the air outlet 6c of the bell mouth 6 once extend downward, and then upward from the gap 9 below the separator 10. It is needless to say that the second air blowing passage 12a extending to the second air outlet passage may be formed.

(Embodiment 3) FIG. 12 shows the configuration of an air conditioner outdoor unit according to Embodiment 3 of the present invention, which is configured by applying the blower of the present invention.

By the way, the tip of the blade 5a of the mixed flow fan 5 and the air suction of the bell mouth 6 are formed in the lower closed portion in the main body casing 1 in which the lower side of the air blowing side is closed and the upper side is opened. As a means for preventing the backflow region from being generated between the airflow opening 6a and the airflow opening 6a, as in the first and second embodiments, the blowout region to the lower side of the mixed flow fan 5 is provided. In addition to providing a convex portion 15 having a round surface shape protruding a predetermined dimension in the direction of the air suction port 3,
For example, as shown in FIG.
Can also be realized by continuously increasing the height from the upper side to the lower side.

As described above, in the case where the flow pattern in the wing portion 5a differs in the vertical direction due to the positional relationship between the mixed flow fan 5 in the main body casing 1 and the air outlets 13 and 14, the above-described operation is performed. The height of the bell mouth 6 is continuously changed so that the lower side is higher than the upper side, thereby changing the bell mouth 6 in accordance with the flow pattern at that position. With a non-axisymmetric shape, the flow from the side where the ventilation resistance is large can be smooth, and the backflow can be prevented. Similarly, the noise at the time of blowing can be reduced.

(Embodiment 4) FIG. 13 shows a configuration of an outdoor unit for an air conditioner according to Embodiment 4 of the present invention, which is configured by applying the blower of the present invention.

Further, the lower end of the air outlet side is closed and the upper end of the bellows 6 is sucked by the tip of the blade 5a of the mixed flow fan 5 and the bell mouth 6 at the lower closed portion in the main body casing 1 whose upper side is open. As a means for preventing the backflow region from being generated between the airflow opening 6a and the airflow opening 6a, as in the first and second embodiments, the blowout region to the lower side of the mixed flow fan 5 is provided. In addition to providing the convex portion 15 having a round shape protruding in the direction of the air inlet 3 by a predetermined dimension, for example, as shown in FIG. 13, the height L of the bell mouth 6 is entirely constant (L ₁ = L _2). ), But the radius of curvature R from the air suction opening 6a to the air blowing opening 6c.
Is formed larger on the upper side R _{1 and} smaller on the lower side R ₂ , so that the wing 5 a and the air inlet opening 6 a of the bell mouth 6 and the wall surface of the fan guide opening 6 b on the lower side are compared with the upper side. While reducing the gap to prevent backflow,
The air suction on the upper side may be promoted.

As described above, when the flow pattern in the wing portion 5a is different in the vertical direction due to the positional relationship between the mixed flow fan 5 and the air outlet 13 in the main body casing 1, the bell is used as described above. Air intake opening 6a of mouse 6
In addition, the size of the gap between the fan guide opening 6b and the blade 5a is changed in accordance with the flow pattern at that position by changing the radius of curvature R, and the flow on the outlet side of the bell mouth 6 is formed into a non-axisymmetric shape. When this is done, the flow from the lower side where the ventilation resistance is large can be smoothed and the backflow can be prevented, while the suction flow velocity on the upper side is promoted and the noise at the time of blowing can be reduced more effectively. it can.

(Embodiment 5) FIGS. 14 and 15
The configuration of the floor-standing indoor unit for an air conditioner according to Embodiment 5 of the present invention, which is configured by applying the blower of the present invention, is shown. In this embodiment, a floor-standing type indoor unit is formed on the basis of the same configuration as that of the second embodiment, and an air outlet 13c is formed in the upper front surface of the main body casing 1, which corresponds thereto. As in the second embodiment, a convex portion 15 is provided on substantially the entire lower portion of the bell mouth 6 (in a range of approximately 160 °).

In the figure, reference numeral 1 denotes a main body casing of the indoor unit. The main body casing 1 is formed in a box shape which is thin in the front-rear direction and slightly longer in the vertical direction than in the horizontal direction. ing. An air suction port 3 is formed on substantially the entire front surface of the front side except for the machine room 2 ′ on the right side, and an air heat exchanger 4 is provided inside the air suction port 3.
Are provided corresponding to the entire surface.

The air inlet 3 is connected to the air heat exchanger 4
Of the bellows 6 of the mixed flow fan 5 provided at a position behind the air inlet opening 6a in the direction of the fan guide opening 6b. And the bellmouth 6
The blade portion 5a of the mixed flow fan 5 is rotatably provided in the fan guide opening 6b of the fan motor 7 and the hub portion 5b of the fan 5a.
Of the motor shaft 7a. The bellmouth 6 is attached to a partition plate 16 having a vertical wall structure.

The fan motor 7 is mounted on the main casing 1.
Of the rear plate 1a. As shown, the bell mouth 6 and the partition plate 16 and the back plate 1a are located between the mixed flow fan 5 and the back plate 1a.
An air blowing passage 11 extending upward from the air blowing opening 6c of the bell mouth 6 is formed between "a" and "a". The air blowing passage 11 is provided with an opening 13b behind the horizontal partition plate 1c above the air heat exchanger 4 and the partition plate 16.
Through the air blowing space between the partition plate 1c and the upper surface 1b of the main body casing 1,
The air outlet 13 formed on the front side of the upper part is connected to the air outlet 13 at an angle.

Therefore, in this configuration, when the mixed flow fan 5 is driven to rotate, air is sucked from the air suction port 3 by the mixed flow fan 5, and the air flows through the air heat exchanger 4 and the mixed flow fan 5. The blowout flow including the blown air blown downward is blown out from the air blowout opening 6 c of the bell mouth 6 to the front of the air blowout port 13 by the air blowout passage 11.

In the case of this embodiment, the lower portion of the air blowing side is closed almost entirely at the lower portion of the bell mouth 6 (in a range of approximately 160 °), and only the upper surface side of the main body casing 1 is closed. In order to prevent a backflow area from being generated between the tip of the blade 5a of the mixed flow fan 5 and the air suction opening 6a of the bell mouth 6, at the lower closed portion in the main body casing 1 where For example, as can be understood from FIGS. 14 and 15, similarly to the second embodiment, a convex portion 15 having a round shape protruding by a predetermined dimension ΔL in the direction of the air suction port 3 is provided. This convex part 15
The installation area of approximately 160 ° corresponds to, for example, a blow-out area of the mixed flow fan 5 on the lower side.

As described above, when the flow pattern in the wing portion 5a differs in the vertical direction due to the positional relationship between the mixed flow fan 5 in the main body casing 1 and the air outlet 13, the convexity as described above is obtained. By providing the portion 15, the shape of the bell mouth 6 is changed according to the flow pattern at that position, and if the whole shape of the bell mouth 6 is made non-axisymmetric, the lower portion of the air outlet passage 11 having a large ventilation resistance is provided. The flow from the side becomes smooth, and the generation of the backflow can be prevented, and the noise at the time of blowing can be reduced.

In this embodiment, a gap 9 having a predetermined width is left between the mixed flow fan 5 and the back plate 1a as in the first embodiment. 1 is not provided with a separator extending to the vicinity of the horizontal partition plate 1c. Of course, in this embodiment, a similar separator is provided, and the bell mouth 6, the partition plate 16, and the back plate 1a are connected by the separator. The first air outlet passage extending upward from the air outlet 6c of the bell mouth 6 and the air outlet 6c of the bell mouth 6 temporarily extend downward, and then upward from the gap below the separator. It goes without saying that a second air blowing passage extending may be formed.

(Other Embodiments) In the above description, the case where the blower of the present invention is applied to, for example, an outdoor unit or an indoor unit for an air conditioner has been described, but the subject of the present invention is not limited thereto. Needless to say, the present invention includes all the blowers provided with, for example, a bell mouth and applied to the air blowing passage having a passage structure in which the circumferential flow of the blower on the air blowing side is a non-axisymmetric flow.

It is needless to say that the blower is not limited to the above-described mixed flow fan, but may be an axial flow fan such as a propeller fan.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a configuration of an air conditioner outdoor unit according to a first embodiment of the present invention configured by applying a blower of the present invention.

FIG. 2 is a side sectional view of the outdoor unit.

FIG. 3 is a front view of a blower portion of the outdoor unit.

FIG. 4 is a sectional view of a main part of the blower part (BB in FIG. 3).
It is.

FIG. 5 is a sectional view of an essential part of the blower (AA in FIG. 3).
It is.

FIG. 6 is a front sectional view of a comparative measurement example of the outdoor unit.

FIG. 7 is a front sectional view of another comparative measurement example of the outdoor unit.

FIG. 8 is a graph showing the number of rotations and the effect of reducing the blowing noise of the outdoor unit of the embodiment, in comparison with a measurement example.

FIG. 9 is a graph showing the relationship between the number of rotations of the outdoor unit and the blowing sound reduction effect of the outdoor unit according to the air flow rate.

FIG. 10 is a front sectional view showing a configuration of an air conditioner outdoor unit according to a second embodiment of the present invention configured by applying the blower of the present invention.

FIG. 11 is a side sectional view of the outdoor unit.

FIG. 12 is a side sectional view showing a configuration of a blower portion of an outdoor unit for an air conditioner according to a third embodiment of the present invention configured by applying the blower of the present invention.

FIG. 13 is a side sectional view of a blower portion of an outdoor unit according to a fourth embodiment of the present invention configured by applying the blower of the present invention.

FIG. 14 is a front sectional view showing a configuration of a floor-standing indoor unit for an air conditioner according to a fifth embodiment of the present invention configured by applying the blower of the present invention.

FIG. 15 is a side sectional view of the indoor unit.

FIG. 16 is a front sectional view showing a configuration of an outdoor unit for an air conditioner according to a first conventional example configured by applying a conventional blower.

FIG. 17 is a side sectional view of the outdoor unit.

FIG. 18 is a front sectional view showing a configuration of an air conditioner outdoor unit according to a second conventional example configured by applying a conventional blower.

FIG. 19 is a side sectional view of the outdoor unit.

FIG. 20 is a cross-sectional view showing a blowing state when a small amount of air is blown in a blower portion of a conventional example.

FIG. 21 is a cross-sectional view showing a state of air blowing at a medium air flow rate in the blower portion of the conventional example.

FIG. 22 is a cross-sectional view showing a state of air blowing at a large air flow rate in the blower portion of the conventional example.

FIG. 23 is a side sectional view showing a configuration of a main part of the conventional blower.

[Explanation of symbols]

1 is a main body casing, 3 is an air inlet, 4 is a heat exchanger,
5 is a mixed flow fan, 5a is a wing, 6 is a bell mouth, 6a is an air intake opening, 6b is a fan guide opening, 6c is an air blowing opening, 7 is a fan motor, 10 is a separator,
11 is an air outlet passage, 11a is a first air outlet passage, 1
2a is a second air blowing passage.

Continued on the front page (72) Inventor Kenjiro Kinoshita 1304 Kanaokacho, Sakai-shi, Osaka Daikin Industries, Ltd. Sakai Seisakusho Kanaoka Factory F-term (reference) 3H034 AA02 AA18 BB02 BB07 BB08 BB20 CC03 DD01 DD12 EE00 EE06

Claims (9)

[Claims] 1. An air outlet passage (11), (12) having a bell mouth (6) and having a passage structure in which a flow in a circumferential direction of an air outlet side of the blower (5) becomes a non-axisymmetric flow. The blower (5), wherein the bell mouth (6)
Characterized in that the shape of the air blower is modified in accordance with the non-axisymmetric flow in the circumferential direction of the air blow side of the blower (5). 2. The method according to claim 1, wherein the shape of the bell mouth (6) is such that the height (L) is increased in the air suction side direction in accordance with the magnitude of the ventilation resistance in the air discharge side circumferential direction. The blower according to claim 1, wherein 3. The deformation of the shape of the bell mouth (6) is such that the height (L) is partially increased in the air suction side direction corresponding to the portion where the ventilation resistance in the air blow side circumferential direction is large. The blower according to claim 1, wherein: 4. The shape of the bell mouth (6) is such that the height (L) is continuously increased in the air suction side direction in accordance with the magnitude of the ventilation resistance in the air discharge side circumferential direction. The blower according to claim 1, wherein: 5. The deformation of the shape of the bell mouth (6) is achieved by changing the radius of curvature (R) of the air intake opening (6a) in accordance with the magnitude of the ventilation resistance in the air blowing side circumferential direction. The blower according to claim 1, wherein the blower is provided. 6. A box-shaped main body casing (1), wherein said air discharge passages (11) and (12) having a passage structure in which the flow in the circumferential direction on the air discharge side is non-axially symmetrical.
, An air inlet (3) provided on the front side, a heat exchanger (4) provided inside the air inlet (3), and a bell mouth (6) behind the heat exchanger (4). ) Are provided behind the blower (5) of the air conditioner including the blower (5) provided through the air blow passages (11) and (12). 6. The blower according to claim 1, 2, 3, 4, or 5. 7. The air blowing passages (11) and (12) each include a separator (10), and the air blown upward from the blower (5) divided by the separator (10) is directed upward. The first air blowing passage (1
1) and a second air blowing passage (1) for leading air blown downward from the blower (5) upward.
7. The method according to claim 6, wherein said two passages are provided.
Blower as described. 8. The blower according to claim 1, wherein the blower is a mixed flow fan. 9. The blower according to claim 1, wherein the blower is an axial fan.