JPH10205828A - Outdoor unit for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent release of a flow by reduction of an air supply resistance by forming a shape of an air outlet of a cross flow fan scrolling unit in a continuous surface state of a straight part and a circular arc part. SOLUTION: A scrolling unit 1 is formed with an air outlet passage 15 extended from an upstream side air suction port 3 side to a downstream side air outlet 2 side via first, second and third circular arc parts (a), (b), (c), a straight part (d) of a length A extended from the part (c) in a tangential direction, and a fourth circular arc part (e) sequentially continued and extended in a direction from the port 3 to a port edge 2a of the outlet 2. Accordingly, with the constitution, shape of the outlet 2 of the unit 1 formed between a tongue 7 and it becomes a passage sectional shape formed of a continuous surface of the part (d) and a new fourth part (e) having a center of curvature in a reverse direction, and a passage width is gradually increased in a direction of the edge 2a. Thus, an air supply resistance is reduced, and release of a flow at the edge 2a can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit for an air conditioner using a cross flow fan.

[0002]

2. Description of the Related Art As shown in, for example, Japanese Patent Application Laid-Open No. 1-212832, an outdoor unit for an air conditioner using a cross flow fan is already known.

FIGS. 5 to 7 show an example of the structure of a conventional outdoor unit 10 for an air conditioner provided with the cross flow fan.

First, reference numeral 11 in the figure denotes a main body housing (main body casing) of the outdoor unit 10 for an air conditioner.

[0005] An air intake grill 12 is formed on the right side portion from the front side of the main body housing 11, and an air outlet grill 13 is formed on a left corner portion on the front side. In the main body housing 11, an air suction passage 14 and an air blowing passage 15 extending from the upstream air suction grill 12 to the downstream air blowing grill 13 are formed continuously with each other. The passage 14 has a cross-fin heat exchanger 1 having an arc-shaped cross section from its upstream side to its downstream side.
6. Cross flow fans 4 are arranged in order. The air outlet passage 15 is formed by the tongue portion 7 and the scroll portion 1, and the upstream end 1 of the scroll portion 1 is provided.
The cross flow fan 4 is provided at the air inlet 3 between the upstream end 7a of the tongue 7 and the air outlet grill 2 of the main body housing 11.
It corresponds to two parts.

The shape of the scroll portion 1 is, for example, as shown in FIG.
As shown in the enlarged view, the center of curvature O is O ₁ , O ₂ , O ₃ ,
The radius of curvature _{R R 1, R 2, R} 3 and each having different first to third
And a shape of a portion of the air outlet 2 portion of the third arc portion c on the air outlet 2 side located at the most downstream side of the scroll portion 1. The diffuser has a linear diffuser shape in which the tangent L extends from the arc surface in the air blowing direction.

[0007]

However, in the case of such a structure, the air outlet 2 is determined by the curvature of the arc portion c.
Since the width of the passage is limited and restricted, a sufficient diffuser action cannot be realized, and when the amount of blown air increases, the blowing resistance increases. Therefore, in order to obtain a constant amount of air, there has been a problem that the number of rotations needs to be increased, and flow separation occurs near the edge 2 a of the air outlet 2, thereby increasing the blowing noise.

The present invention has been made in order to solve the above-mentioned problem, and the shape of the air outlet of the scroll portion is formed into an arcuate surface which enlarges the width of the passage toward the edge of the scroll portion. It is an object of the present invention to provide an outdoor unit for an air conditioner that can be effectively expanded to reduce airflow resistance, prevent flow separation, and exhibit an effective diffuser function.

[0009]

Means for Solving the Problems The outdoor unit for an air conditioner of the present invention is provided with the following means for solving the problems in order to achieve the above objects.

That is, an outdoor unit for an air conditioner according to the first aspect of the present invention is an outdoor unit for an air conditioner having a cross flow fan, wherein the shape of the air outlet of the cross flow fan scroll is changed to the air flow upstream. The width of the air blowing passage is increased by forming a continuous surface shape of the straight portion and the arc portion from the side toward the downstream side.

In this case, the linear portion is more specifically a linear portion extending tangentially to an arc from the air suction port side of the scroll portion, and the circular portion is the same linear portion. And a circular arc portion having a center of curvature on the side opposite to the center of the fan rotor of the cross flow fan with respect to a scroll line continuous from the air suction port side of the scroll portion.

With this configuration, as described above, the passage width of the air outlet on the downstream side of the scroll portion is increased in the direction of the edge.

As a result, an effective diffuser function can be exhibited, the blowing resistance can be reduced, and the separation of the flow at the edge portion is suppressed, so that the blowing noise can be reduced as much as possible. it can.

According to a third aspect of the present invention, in the outdoor unit for an air conditioner having a crossflow fan, the shape of the air outlet of the crossflow fan scroll portion is changed to the upstream of the airflow. The width of the air blowing passage is enlarged by forming the continuous surface shape of the arc portion from the side toward the downstream side.

[0015] In this case, more specifically, the arc portion is in contact with the arc from the air suction port side of the scroll portion and is connected to a scroll line continuous from the air suction port side of the scroll portion. The cross flow fan is configured to have an arc portion having a center of curvature on the side opposite to the center of the fan rotor.

With this configuration, as described above, the width of the passage of the air outlet on the downstream side of the scroll portion is increased in the direction of the edge.

As a result, an effective diffuser function can be exhibited, the blowing resistance can be reduced, and the separation of the flow at the rim is suppressed, so that the blowing noise can be reduced as much as possible. it can.

[0018]

As described above, according to the outdoor unit for an air conditioner of the present invention, a constant air volume can be realized at a low rotational speed and low noise as much as possible.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 to 3 show the configuration and operation of an outdoor unit for an air conditioner using a cross flow fan according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a scroll portion of the outdoor unit, 7 denotes a tongue portion, 2 denotes an air outlet of the scroll portion 1, 3 denotes an air inlet of the scroll portion 1, and 1a denotes a tongue portion 7a. The upstream end 4 of the scroll portion 1 forming the air suction port 3 together with the upstream end 7a of the scroll portion 1
A cross-flow fan (fan rotor) rotatably provided on the air suction port 3 side formed between the upstream end 1a of the tongue 7 and the upstream end 7a of the tongue 7.

[0021] The scrolling unit 1, to the downstream-side air outlet 2 side from the upstream side air suction port 3 side, the curvature center position O _1, a first arcuate portion a radius of curvature R _1, the curvature center position O _2, the second radius of curvature R ₂ and the arc portion b, the center of curvature position O _3, and a third arc portion c of the radius of curvature R _3, the length a extending tangentially from the circular arc portion c of the third The straight portion d, the fan rotor 4 and the first, second, and third arc portions a, b, and c
And a fourth arc e having a radius of curvature R ₄ having a center of curvature O ₄ in the outer space on the opposite side, and successively extending from the air inlet 3 to the edge of the air outlet 2 from the air inlet 3. 2
An air blowing passage 15 extending in the direction a is formed.

Therefore, in this configuration, the shape of the air outlet 2 of the scroll portion 1 formed between the tongue portion 7 and the tongue portion 7 has a new curvature center in the opposite direction to the straight portion d shorter than the conventional one. 4 has a passage sectional shape formed from a continuous surface with the arc portion e, and the passage width gradually increases in the direction of the lip portion 2a.

As a result, the blowing resistance is reduced, and the separation of the flow at the edge 2a of the air outlet 2 is suppressed.
In addition, the diffuser function is effectively improved. Thus, when a constant air volume is to be obtained, for example, in a large air volume type outdoor unit for an air conditioner, the air volume can be increased as compared with the conventional air conditioner as shown in FIGS. 2 and 3, for example. This can be realized in a low rotational speed and low noise state.

(Embodiment 2) Next, FIG. 4 shows a configuration of an outdoor unit for an air conditioner using a cross flow fan according to Embodiment 2 of the present invention.

In the configuration of this embodiment, the configuration shown in FIG.
In the configuration of the first embodiment, the continuous surface portion between the straight portion d on the air outlet 2 side of the air outlet passage 15 and the third arc portion e is
For example, as shown in FIG. 4, it is characterized by being formed only by an arc portion f having a large arc angle with an external curvature center position O ₅ and a curvature radius R ₅ .

According to this structure, the width of the passage can be increased as in the case of the first embodiment, the blowing resistance can be reduced, flow separation can be suppressed, and the diffuser function can be effectively improved. This makes it possible to realize an outdoor unit for an air conditioner with as low a rotational speed and low noise as possible when obtaining a constant air volume.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a configuration of a main part of an outdoor unit for an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a graph showing a relationship between a blowing amount and a rotation speed of the outdoor unit.

FIG. 3 is a graph showing a relationship between an air blowing amount and a blowing noise of the outdoor unit.

FIG. 4 is an enlarged sectional view showing a configuration of a main part of an outdoor unit for an air conditioner according to Embodiment 2 of the present invention.

FIG. 5 is a central longitudinal sectional view of an air conditioner outdoor unit using a conventional general cross flow fan.

FIG. 6 is a horizontal sectional view of the outdoor unit.

FIG. 7 is an enlarged sectional view of a main part of the outdoor unit.

[Explanation of symbols]

1 is a scroll portion, 2 is an air outlet, 2a is an edge of the air outlet, 3 is an air inlet, 4 is a cross flow fan (fan rotor), 7 is a tongue, and 15 is an air outlet passage.

Claims (4)

[Claims] In an outdoor unit for an air conditioner equipped with a cross flow fan, an air outlet of a cross flow fan scroll portion has a continuous surface shape of a straight portion and an arc portion from an upstream side to an downstream side of an air flow. An outdoor unit for an air conditioner, characterized in that the width of the air outlet passage is increased by adopting the above. 2. The linear portion comprises a linear portion extending tangentially to a circular arc from the air suction port side of the scroll portion,
The arc portion is in contact with the straight portion, and has an arc portion having a center of curvature on the side opposite to the center of the fan rotor of the cross flow fan with respect to a scroll line continuous from the air suction port side of the scroll portion. The outdoor unit for an air conditioner according to claim 1, wherein: 3. An outdoor unit for an air conditioner equipped with a cross flow fan, wherein the shape of the air outlet of the cross flow fan scroll portion is a continuous surface shape of an arc portion from the upstream side to the downstream side of the air flow. An outdoor unit for an air conditioner, characterized in that the width of the air outlet passage is increased by the above. 4. The arc portion is in contact with the arc from the air suction port side of the scroll portion and has a curvature in a direction opposite to the fan center of the cross flow fan with respect to a scroll line continuous from the air suction port side of the scroll portion. The outdoor unit for an air conditioner according to claim 3, comprising an arc portion having a center.