JP2932814B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner,
More specifically, the present invention relates to an air outlet structure in an air conditioner provided with an axial fan (for example, an outdoor unit for an air conditioner).

[0002]

2. Description of the Related Art An outdoor unit for an air conditioner having a casing having a bell mouth serving as an air outlet and an axial fan disposed in the bell mouth is disclosed in Japanese Utility Model Application Laid-Open No. 58-6977.
As disclosed in Japanese Patent Publication No. 0, it is well known in the art.

For example, as shown in FIG. 8, an outdoor unit for an air conditioner includes a casing 1 having a bell mouth 3 serving as an air outlet 2, and an axial fan 4 is disposed inside the bell mouth 3. The casing 1 and a device 5 (for example, a heat exchanger 5a, an electric component box 5b, etc.) disposed on a peripheral portion in the casing 1 are provided on the suction-side outer periphery of the axial fan 4 on the suction side. An enclosed substantially annular passage 6 is to be formed. Reference numeral 7 denotes a compressor.

As shown in FIG. 9, the passage 6 has a large space portion 6a in which drift of the intake air flow F is likely to occur due to the size of the width of the device 5 and a continuous space in the circumferential direction with the large space portion 6a. And a small space portion 6b in which the drift of the suction air flow F is unlikely to occur.

The cause of the above-mentioned drift is that, in the small space 6b, the flow of the airflow F sucked into the axial fan 4 on the outer peripheral side of the axial fan 4 is relatively smooth as shown in FIG. As shown in FIG. 11, in the large space portion 6a, if the flow of the airflow F sucked into the axial fan 4 on the outer peripheral side of the axial fan 4 is smooth, as shown in FIG. It is considered that the large eddy current Ea is generated.

[0006]

When the above-mentioned drift occurs, the turbulent boundary layer separation on the blade surface of the axial fan 4 is greatly increased. A and A (see FIG. 9) occur, and the noise increases. Such an increase in noise is contrary to the current situation where there is a strong demand for lowering the noise of the air conditioner.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to prevent the occurrence of a drift by reducing a large swirl generated on the suction side outer periphery of an axial fan.

[0008]

According to the first aspect of the present invention, as a means for solving the above problems, as shown in the drawings , a casing 1 having a bell mouth 3 serving as an air outlet 2 at an upper portion is provided. An axial fan 4 in the bell mouth 3
And, on the suction side outer periphery of the axial fan 4,
In the air conditioner in which a substantially annular passage 6 surrounded by the casing 1 and an upper end of a device 5 disposed on a peripheral portion in the casing 1 is formed, the substantially annular passage 6 includes:
A predetermined distance from the upper end of the device 5 toward the device 5 from a portion of the casing 1 facing the upper end of the device 5
A control plate 8 is provided which extends substantially concentrically with the axial fan 4 above the dimension .

According to the present invention, as means for solving the above-mentioned problems, as shown in the drawings, the air outlet 2
Provided with a casing 1 having a bell mouth 3
An axial fan 4 is provided in the bell mouth 3
At the outer periphery of the axial flow fan 4 on the suction side, the casing 1
And the upper end of a device 5 disposed on a peripheral portion in the casing 1
And a large space portion 6 in which drift of the suction air flow F is likely to occur.
a in the circumferential direction and the suction space
Substantially ring ing from the pocket part 6b which drift is less likely to occur in the air flow F
In the air conditioner in which the passage 6 is formed,
The equipment 5 in the casing 1 is provided in the large space 6a.
From the part opposite to the device 5 toward the device 5
Substantially concentric with the axial fan 4 above a predetermined dimension from the end
The control plate 8 is provided to extend to the right side.

According to a third aspect of the present invention, as shown in the drawings, in the air conditioner of the first aspect, the mounting position of the control plate 8 and the axial fan 4 are provided as means for solving the above problems. Where r is the distance from the axis O and R is the radius of the axial fan 4, r / R is set in the range of 1.1 to 1.3, and the axial length of the control plate 8 L, the length of the suction side end 4a on the outer periphery of the axial fan 4 protruding from the base end 3a of the bell mouth 3 to the suction side is W.
When b is set, L / Wb ≧ 1.7 is set.

According to a fourth aspect of the present invention, as a means for solving the above problem, as shown in the drawings, in the air conditioner according to the first or second aspect, the control plate 8 is
A plurality of sheets having different axial lengths are used.

[0012]

According to the first or second aspect of the present invention, the following effects can be obtained by the above means.

That is, the air flow F flowing on the outer peripheral side of the axial fan 4 flows while being pressed by the control plate 8 and has a substantially annular shape.
The large eddy current Ea (see FIG. 11) to be generated in the passage 6 or the large space 6a is broken by the tip of the control plate 8 into a small eddy current E ′, so that a local pressure drop portion (that is, As a result, a pressure increase in the generation section is obtained, and drift on the suction side is suppressed. I
The lower end of the control board 8 is a device 5 (for example, a heat exchanger, etc.)
The structure does not overlap with the upper part of the
The amount of air flowing through the heat exchanger 5 (for example, heat exchanger) is restricted.
No more.

According to the third aspect of the present invention, the following effects can be obtained by the above means.

That is, since the shape and the mounting position of the control plate 8 can be optimized, the pressure loss before and after the axial fan 4 can be efficiently reduced.

According to the fourth aspect of the present invention, the following effects can be obtained by the above means.

That is, the large eddy current Ea (see FIG. 11) to be generated in the large space 6a is more actively broken by the tips of the plurality of control plates 8.

[0018]

According to the first aspect of the present invention, the air outlet 2
And a casing 1 having a bell mouth 3 at an upper portion thereof. An axial fan 4 is disposed in the bell mouth 3, and the casing 1 and the inside of the casing 1 are provided around the suction side outer periphery of the axial fan 4. Above the equipment 5 arranged on the periphery
In the air conditioner in which a substantially annular passage 6 surrounded by an end is formed, a portion of the casing 1 facing the upper end of the device 5 in the casing 1 is directed toward the device 5. A control plate 8 extending substantially concentrically with the axial fan 4 from the upper end of the device 5 to a predetermined dimension above is provided, and an air flow F flowing on the outer peripheral side of the axial fan 4 is controlled by the control plate 8. passing flow and substantially annular smoothly while being pressed by
A large vortex Ea to be generated in the passage 6 (FIG. 11)
) Is broken by the tip of the control plate 8 to form a small vortex E ′, so that a local pressure increase in the pressure drop portion (that is, the vortex generating portion) is obtained, and the suction side is increased. The occurrence of drifting in the
There is an excellent effect that noise reduction and power loss can be suppressed. In addition, the lower end of the control plate 8 is
For example, a structure that does not overlap with the upper part of a heat exchanger
The equipment 5 (for example, a heat exchanger)
The effect that the amount of air flowing is not restricted
There is also.

According to the second aspect of the present invention, the air outlet 2
Provided with a casing 1 having a bell mouth 3
An axial fan 4 is provided in the bell mouth 3
At the outer periphery of the axial flow fan 4 on the suction side, the casing 1
And the upper end of a device 5 disposed on a peripheral portion in the casing 1
And a large space portion 6 in which drift of the suction air flow F is likely to occur.
a in the circumferential direction and the suction space
Substantially a ring composed of a small space portion 6b in which drift of the airflow F is unlikely to occur.
In the air conditioner in which the passage 6 is formed,
The equipment 5 in the casing 1 is provided in the large space 6a.
From the part opposite to the device 5 toward the device 5
Substantially concentric with the axial fan 4 above a predetermined dimension from the end
And a control plate 8 extending in the axial direction is provided on the outer peripheral side of the axial fan 4.
The air flow F is smoothly pressed while being pressed by the control plate 8.
In the large space 6a.
The eddy current Ea (see FIG. 11) is generated by the tip of the control plate 8.
Crushed into small eddies E '
Pressure rise in a typical pressure drop (ie, vortex generator)
And the occurrence of drift on the suction side is suppressed.
Noise and power loss
There is an excellent effect that it can be suppressed. Moreover, the control board
8 is connected to the upper part of equipment 5 (for example, heat exchanger, etc.)
Because of the structure that does not wrap, the equipment 5 (for example,
That the amount of air flowing through the heat exchanger) is limited.
There is also an effect that it disappears.

According to the invention of claim 3 , according to claim 1 and
3. The air conditioner according to claim 2 , wherein a distance between a mounting position of the control plate 8 and an axis O of the axial fan 4 is r, and a radius of the axial fan 4 is R. / R =
The length in the axial direction of the control plate 8 is set to L, and the suction side end 4a on the outer periphery of the axial fan 4 is set at the suction side from the base end 3a of the bell mouth 3 to the suction side. When the length protruding from the axial flow fan is set to Wb, L / Wb ≧ 1.7 is set, so that the pressure loss before and after the axial fan 4 can be more efficiently reduced, and the loss reduction and There is an excellent effect of greatly contributing to reduction of power loss.

According to the invention of claim 4, claims 1 to
11. The air conditioner according to claim 3, wherein the control plate 8 is a plurality of sheets having different axial lengths, and a large vortex Ea to be generated in the large space 6 a (FIG. 11).
) Can be more positively crushed, so that there is an excellent effect that noise reduction and power loss can be further reduced.

[0022]

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

Embodiment 1 FIGS. 1 and 2 show a main part of an air conditioner according to Embodiment 1 of the present invention. This embodiment is similar to the first embodiment.
This corresponds to the invention of Chair 3 .

The overall configuration of the air conditioner of this embodiment is the same as that described in the section of the prior art. Therefore, the same reference numerals are given to the respective constituent means, and the detailed description is omitted.

In this embodiment, the large space 6a in the substantially annular passage 6 formed on the suction-side outer periphery of the axial fan 4 extends from the portion of the casing 1 facing the device 5 toward the device 5. A control plate 8 extending substantially concentrically with the axial fan 4 is provided.

With such a configuration, the air flow F flowing on the outer peripheral side of the axial fan 4 flows smoothly while being pressed by the control plate 8, and the large space portion 6a in the substantially annular passage 6 is formed. Eddy current Ea that is about to occur at
Since the small vortex E ′ (see FIG. 11) is broken by the tip of the control plate 8, a pressure increase in a local pressure drop portion (that is, a vortex generation portion) is obtained. In addition, the occurrence of drift on the suction side is suppressed, so that noise reduction and power loss are also reduced. Moreover, the lower end of the control plate 8 is
(For example, a heat exchanger, etc.)
Flow through the equipment 5 (for example, heat exchanger).
The amount of air passing is not limited.

Incidentally, the distance between the mounting position of the control plate 8 and the axis O of the axial fan 4 is r, the radius of the axial fan 4 is R, and the axial length of the control plate 8 is L, Let Wb be the length that the suction side end 4a on the outer periphery of the axial fan 4 projects from the base end 3a of the bell mouth 3 to the suction side,
When the change in pressure loss ΔPs with respect to L / Wb was examined using r / R = a as a parameter, the results shown in FIG. 5 were obtained. When the control plate 8 is not provided, a pressure loss indicated by a point X occurs.

According to this, r / R = a = 1.1-1.
3, it can be seen that the effect of reducing the pressure loss ΔPs is great in the range of L / Wb ≧ 1.7. Therefore,
In designing the shape and mounting position of the control plate 8, it is desirable to set a = 1.1 to 1.3 and L / Wb ≧ 1.7. In particular, a = 1.2, L / Wb ≧
1.7 is ideal.

Further, the changes in the noise S and the fan rotation speed N with respect to the air flow Q in the embodiment and the conventional example were examined, and the results shown in FIGS. 6 and 7 were obtained. Here, a solid line indicates the present embodiment, and a dotted line indicates a conventional example.

According to this embodiment, the noise S of the present embodiment is 1.5 dB lower than that of the conventional example at the same airflow S.
It can be seen that the rotation speed N is lower by 20 rpm than that of the conventional example. That is, this embodiment greatly contributes to noise reduction and power loss reduction.

Second Embodiment FIGS. 3 and 4 show a main part of an air conditioner according to a second embodiment of the present invention. This embodiment is described in claims 1 to 3.
This corresponds to the invention of FIG.

In the case of this embodiment, two control plates 8A and 8B having different axial lengths L are provided in the large space 6a of the substantially annular passage 6 . That is, the axial length L2 of the control plate 8B farther from the axial flow fan 4 is longer than the axial length L1 of the control plate 8A closer to the axial flow fan 4. In addition, both control boards 8A and 8B have a = 1.1-1.
3. L / Wb ≧ 1.7 is satisfied.

With such a configuration, the substantially annular passage 6
The large eddy current Ea (see FIG. 11) to be generated in the large space 6a in the large space portion 6a is more actively broken, so that noise reduction and power loss can be further reduced.

The present invention is not limited to the configuration of each of the above-described embodiments, and it is a matter of course that the design can be changed as appropriate without departing from the gist of the invention.

[Brief description of the drawings]

FIG. 1 is an upper cross-sectional plan view of an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is an upper half vertical sectional view of the air conditioner according to the first embodiment of the present invention.

FIG. 3 is an upper cross-sectional plan view of the air conditioner according to Embodiment 2 of the present invention.

FIG. 4 is an upper half vertical sectional view of an air conditioner according to a second embodiment of the present invention.

FIG. 5 shows a distance r between the mounting position of the control plate 8 in the air conditioner and the axis O of the axial fan 4, a radius R of the axial fan 4, and an axial length of the control plate 8. L, the length of the suction-side end 4a on the outer periphery of the axial fan 4 protruding from the base end 3a of the bell mouth 3 toward the suction side is Wb, and r / R = a is used as a parameter to L / Wb. FIG. 9 is a characteristic diagram showing a change in pressure loss ΔPs.

FIG. 6 is a characteristic diagram showing a change in noise S with respect to an air volume Q in the embodiment and the conventional example.

FIG. 7 is a characteristic diagram showing a change in a fan rotation speed N with respect to an air volume Q in the embodiment and the conventional example.

FIG. 8 is a longitudinal sectional view showing a conventional outdoor unit for an air conditioner.

FIG. 9 is a schematic diagram for explaining a flow of a suction airflow in a conventional air conditioner outdoor unit.

FIG. 10 is an upper half vertical sectional view for explaining a flow of an intake air flow in a small space portion in FIG. 9;

11 is an upper half-sectional vertical sectional view for explaining a flow of a suction airflow in a large space portion in FIG. 9;

[Explanation of symbols]

1 is a casing, 2 is an air outlet, 3 is a bell mouth, 3
a is a base end of a bell mouth, 4 is an axial fan, 4a is a suction side end on the outer periphery of the axial fan, 5 is a device, 5a is a heat exchanger, 5b is an electric component box, 6 is a substantially annular passage, 6a
Is a large space portion, 6b is a small space portion, 8, 8A and 8B are control plates, F is a suction air flow, and O is the axis of an axial fan.

──────────────────────────────────────────────────続 き Continuation of front page (56) References Japanese Utility Model Showa 50-106753 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24F 5/00

Claims (4)

(57) [Claims] 1. A casing (1) having a bell mouth (3) serving as an air outlet (2) at an upper part thereof, wherein an axial fan (4) is disposed in the bell mouth (3). A substantially annular passage (6) surrounded by the casing (1) and the upper end of a device (5) disposed on a peripheral portion in the casing (1) on the suction-side outer periphery of the axial fan (4). Wherein the substantially annular passage is formed.
(6) The axial flow fan extends from a portion of the casing (1) facing the upper end of the device (5) toward the device (5) toward a predetermined dimension above the upper end of the device (5). (4) and the air conditioner is characterized by providing extension building control plate (8) substantially concentrically. 2. A bell mouth which becomes an air outlet (2).
The bell mau having a casing (1) having (3).
An axial fan (4) in the fan (3),
The casing is provided around the suction side of the axial fan (4).
(1) and a machine disposed at a peripheral portion in the casing (1)
Surrounded by the upper end of the vessel (5), the drift of the suction air flow (F) is
Large space portion (6a) which is likely to occur, and large space portion (6a) and surroundings
Direction and the drift of the suction air flow (F) occurs.
A substantially annular passage (6) composed of a small space portion (6b)
The air conditioner formed, wherein the large space portion (6
a) The device in the casing (1)
Forward from the part facing (5) toward the device (5)
A shaft extending by a predetermined dimension substantially concentrically with the axial flow fan (4)
Air conditioner you characterized in that a control plate (8). 3. When the distance between the mounting position of the control plate (8) and the axis (O) of the axial flow fan (4) is r, and the radius of the axial flow fan (4) is R, r /R=1.1-1.
3, and the axial length of the control plate (8) is L, and the suction side end (4a) on the outer periphery of the axial flow fan (4) is the base end of the bell mouth (3). When the length protruding from 3a) to the suction side is Wb, L / Wb
3. The air conditioner according to claim 1, wherein the air conditioner is set in a range of ≧ 1.7. 4. Wherein the control plate (8), wherein a claim 1, characterized in that there is a plurality of different axial length
The air conditioner according to claim 3 .