JPS6226431A - Outdoor unit of air conditioner - Google Patents

Abstract

PURPOSE:To suppress the lowering of functions of a propeller fan and the increasing of noise by constructing a blow-off guide in such a manner that the area thereof is increased toward the heat outlet side from the heat inlet side so as to decrease the air flow speed at the time of passing through a protective net. CONSTITUTION:A blow-off guide 4 is molded integrally with a protective net 4a by a resin, and formed so that the area increases from the inlet side to the outlet side, that is, the inlet side of the air flow toward the side of the protective net 4a. The curvature of the guide portion of the guide 4 is set to a curvature utilizing the flow adherence effect, that is, a curvature in which the air flow is not exfoliated from the inner surface of the blow-off guide when the air flow passes. When air is blown out of the blow-off guide 4, the flow speed of air passing through the blow-off guide 4 gradually decreases from the inlet toward the outlet, and the flow speed of air passing through the protective net 4a becomes low, and the pressure loss in the protective net 4a becomes low, whereby the lowering of the function of the propeller fan is suppressed, and a noise generated when passing through the protective net 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an outdoor unit of an air conditioner that includes a propeller fan and a blowout guide, and particularly relates to the structure of the blowout guide.

[Background of the invention]

Conventional propeller fan blowout guide structures used in outdoor units of air conditioners include those that simply have a bell mouth, and those that have a duct-like guide tV, but in either case, the diameter of the guide is normally set approximately 2 to 8% larger than the outer diameter of the propeller fan. 2nd grade. 4. Air 6. A2, 7, 71
This is because the performance of Furthermore, it is necessary to provide a protective net at the end of the guide in order to protect against rotating objects, such as to prevent third parties from inserting their fingers.

However, as mentioned above, the diameter of the blowout guide is constrained by the outer diameter of the propeller fan, so especially when operating the propeller fan at high rotational speeds to obtain a large air volume, the wind speed passing through the blowout guide becomes large. However, there was a problem in that the protective net acted as a large resistor, reducing the performance and efficiency of the propeller fan, and increasing the noise generated when the airflow passed through the mackerel net. In addition, if the propeller fan is installed sideways, that is, if the air blowing direction is horizontal, depending on the installation location of the outdoor unit of the air conditioner, the cold or hot air blown out during operation may be directed directly to a third party. There was also the problem of causing discomfort.

For example, Japanese Utility Model Publication No. 59-29666 is related to the blowout guide of an outdoor unit of an air conditioner, but it does not deal with the above-mentioned problem.

[Purpose of the invention]

An object of the present invention is to provide an outdoor unit for an air conditioner that can suppress a decrease in the performance of a propeller fan and an increase in noise.

[Summary of the invention]

In the present invention, the blowout guide has a structure in which the area through which the wind passes increases from the inlet side to the outlet side, and the wind speed passing through the blowout guide is gradually decreased, thereby reducing the wind speed when passing through the protective net. In particular, it suppresses the performance degradation and noise increase of the propeller fan, and by blowing out the wind with a velocity component in the circumferential direction, it prevents third parties from experiencing discomfort such as being hit directly by the wind. be.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. M1 is a perspective view showing the blow-off guide according to the present invention, FIG. 2 is a plan view showing an outdoor unit of an air conditioner according to the invention, and FIG. 3 is a front view thereof. In FIGS. 2 and 3, 1 is a housing of the outdoor unit, and inside this housing 1, a trickle impeller 2 of a propeller fan, a driving motor 3, a blowing guide 4, and a heat exchanger 5 are installed. It is arranged. 6 is a machine room for the outdoor unit.

As shown in FIG. 1, the blowout guide 4 is integrally molded with the protective net 4a from VC resin, and the area through which the air passes increases from the inlet side to the outlet side, that is, toward the protective net 4a side. The shape is increasing. Maku, speech bubble guide 4
The curvature of the guide part is a curvature that utilizes the adhesion effect of the flow,
That is, the curvature is set so that the flow of air does not separate from the inner surface of the blowout guide when the air passes through. Furthermore, the diameter of the inlet portion of the blowout guide 40 is the outer diameter 02 of the trickle impeller 2.
This is an increase of ~8%, so that the performance of the propeller fan alone is not impaired.

Next, the operation of this embodiment will be explained.

When the trickle impeller 2 is driven by the motor 3, air is sucked in from the heat exchanger 5 side, and the heat-exchanged air is blown out through the entire blowout guide 4. When air is blown out from the blowout guide 4, the flow velocity of the wind passing through the blowout guide 4 gradually decreases from the inlet to the outlet, and the flow velocity passing through the protective net 4a becomes small, resulting in pressure loss in the protective net 48. By reducing the amount, the performance of the propeller fan is suppressed from deteriorating, and the noise generated when passing through the protective net is reduced. In addition, due to the adhesion effect of the flow, the wind is blown out with a velocity component in the circumferential direction, as shown by the dashed arrows in Figures 2 and 3, so the wind hits third parties directly, causing discomfort. The problem of causing this problem will also be resolved. ' Figs. 4 and 5 show another embodiment of the present invention, which differs from the first embodiment in that the blow-out guide 4 has an inner surface provided with static electricity in the direction opposite to the twisting direction of the rotor blades of the trickle impeller 2. The point is that a plurality of wings 7 are attached at regular intervals.

Figures 6 and 7 show the population velocity triangle and outlet velocity triangle of the axial flow impeller 20 in this embodiment.In general, in the trickle impeller 2, the absolute velocity U of air at the inlet is the circumferential velocity of the impeller . at right angles to the absolute velocity of the air at the outlet U. ri It is not perpendicular to the impeller circumferential speed ■ and has a swirling component V.

This swirling component hardly contributes to the aerodynamic work of the axial flow impeller 2, and becomes a factor in reducing the performance and efficiency of the propeller fan.

However, in this example, the flow direction is
7 is provided, and the swirling component can be recovered in the axial flow direction, making it possible to further increase the performance and efficiency of the propeller fan.

Note that the arrow in FIG. 5 indicates the rotation direction of the axial flow impeller 2. Further, in FIGS. 5 and 6, illustration of the protection net is omitted to simplify the structure.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to suppress a decrease in the performance of a propeller fan and an increase in noise.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present research, in which FIG. 1 is a perspective view of a blowout guide, FIGS. 2 and 3 are a plan view and a front view of an outdoor unit of an air conditioner, and FIG. 5 shows another embodiment of the present invention, FIG. 4 is a perspective view of the blowout guide, FIG. 5 is a front view showing the positional relationship between the blowout guide and the trickle impeller, and FIGS. FIG. 7 is an explanatory diagram of an artificial velocity triangle and an explanatory diagram of an exit velocity triangle of an axial flow impeller. 2... Axial flow impeller 4... Blowout guide 7
...Shizuyoshi. $; 1 country 2 drawings

Claims (1)

[Claims] 1. In an outdoor unit of an air conditioner that includes a propeller fan and a blowout guide, the blowout guide has a structure in which the area through which air passes increases from the air inlet side to the outlet side. An outdoor unit of an air conditioner characterized by the following. 2. Claim 1 is characterized in that a plurality of stationary blades are attached to the inner surface of the blowout guide at regular intervals in a direction opposite to the twisting direction of the rotor blades of the propeller fan. Outdoor unit of air conditioner.