JPH1068537A - Outdoor machine unit for air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve blast performance and to reduce the generation of noise by providing an air guide part having an air flow straightening surface extending in the direction of an air outlet grill in a state to be continued from the rear end of a bell mouth. SOLUTION: An air outlet grill 17 of an outdoor machine unit is protruded frontward by a width W of a mounting edge part 17a from a front part 12a of a cassette casing 12, in which an air supply port 18 is formed, through the mounting edge 17a to a cassette casing front part 12a having width W. A plate- form wind direction regulation guide 21 to arbitrarily regulate a wind direction is inclinably arranged at an opening part for air supply on the front part side. Further, an air guide 22 for turbulence prevention having rounding surfaces for straightening of an air flow, having a curvature gradually increasing radially externally continuously from the rear end of a bell mouth 19, at four corners in the directions of diagonal lines in a space formed according to a frontward protrusion size W inside the air outlet grill 17 is disposed in a state to extend approximately to the vicinity of an air direction regulation guide 21 of the air outlet grill 17.

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 outdoor unit for an air conditioner.

[0002]

2. Description of the Related Art As shown in FIGS. 12 to 15, for example, a conventional outdoor unit 1 for an air conditioner has a box-shaped cassette casing 5 and a corner extending from one inner side to the back of the cassette casing 5. A heat exchanger 6 provided in a shape,
A blower fan 2 provided in front of the heat exchanger 6; a machine room 7 provided beside the heat exchanger 6 and the fan 2; and a machine room 7 provided behind the heat exchanger 6. And a lattice-shaped air blow grill 4 provided in front of the fan 2.

The fan 2 is composed of, for example, a propeller fan having five blades, and a hub 2b on the base side of the blade portion 2a.
The drive shaft 2d of the fan motor 2c is connected to the rear from the rear side, and is driven to rotate by the fan motor 2c.

The cassette casing 5 is formed as thin as possible, for example, so that the rear edge of the blade 2a of the fan 2 is substantially the same face as the air outlet 9 formed on the front face 5a side of the cassette casing 5. It is fitted with a predetermined clearance in the radial direction so as to be in a planar state, and a cylindrical bell mouth 3 is provided around the outer periphery thereof so as to be continuous with the air outlet 9. The air blowing grille 4 has a rectangular shape that looks good in design as is apparent from FIG. 13, for example, and has a large number of horizontal direction adjusting guides 21, 21. The bell mouth 3 has a larger diameter than the bell mouth 3 formed in a lattice structure. The air blow grill 4
Has a mounting edge portion 4a for retrofitting to the front surface portion 5a of the cassette casing 5 having the air outlet 9, and protrudes forward by a dimension V thereby. A rectangular space is formed.

The fan 2 of the outdoor unit 1
The bell mouth 3 has a structure close to a cylindrical shape on the side of the air outlet 9 in order to obtain as high a static pressure as possible. In the case of such a cylindrical structure, the static pressure is improved, and the airflow blown from the fan 2 is efficiently blown straight at a high flow rate in the front direction of the air blowout grill 4 of the outdoor unit 1.

[0006]

On the other hand, as described above, a large-diameter square and grid-shaped air outlet protruding by a predetermined dimension V downstream of the rear end of the bell mouth 3 downstream of the fan 2 as described above. Due to the presence of the grill 4, especially in the diagonal direction 4
The pressure loss due to the flow path expansion at the corner is large, and when viewed from the entire air blowing grill 4, the locally high air flow (FIG. 12)
Vmax) hits the air blowing grille 4, the pressure loss at the portion is large, and a large wind noise is generated at the air blowing grille 4 portion. At the same time, there is a problem that the flow of air is separated immediately downstream of the bell mouth 3 as shown in FIG. 15 and the flow is disturbed, further increasing noise.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. The present invention has been made to reduce the pressure loss of the air blow-out grill portion and maintain the high static pressure performance as much as possible while further reducing the bell mouth downstream. It is an object of the present invention to provide an outdoor unit for an air conditioner that has as high a ventilation performance as possible and has low noise by preventing turbulence from occurring.

[0008]

Means for Solving the Problems In order to achieve the above object, the present invention is provided with the following means for solving the problems.

That is, the outdoor unit for an air conditioner of the present invention has a diameter larger than that of the bell mouth, which first protrudes downstream from the rear end of the cylindrical bell mouth on the outer periphery of the blower fan blade by a predetermined size. An outdoor unit for an air conditioner having an air outlet grill is provided with an air guide portion having an air flow rectifying surface extending in the direction of the air outlet grill so as to be continuous from the rear end of the bell mouth.

Further, the outdoor unit for an air conditioner of the present invention has a rectangular shape having a diameter larger than that of the bell mouth, which protrudes downstream from the rear end of the cylindrical bell mouth of the blower fan blade by a predetermined size. In the outdoor unit for an air conditioner having the air outlet grille, an air guide portion having an air flow rectifying surface extending in the direction of the air outlet grill is provided so as to be continuous from the rear end of the bell mouth. .

In each of the above configurations, the air guide portion is formed such that the radius of the air guide portion is increased from the rear end of the bell mouth in the air blowing grill direction, for example, in the radial direction, as described above. Since it has an extended air flow rectifying surface, the wind from the blower fan is first blown from the cylindrical bell mouth at a high static pressure and high flow rate in the direction of the air blow grill, and further from the bell mouth rear end. The air flow is rectified by the Coanda effect on the air flow rectification surface of the air guide part, and finally flows smoothly to the air blow grill at a more uniform wind speed. Pressure loss and loud wind noise at the side air outlet grill section are reduced, and separation and turbulence due to a sudden increase in the flow path diameter hardly occur.

Accordingly, the conventional pressure loss and turbulent noise are greatly reduced. In addition, since the cylindrical shape of the bell mouth itself is not restricted at all, it is possible to sufficiently improve the original high static pressure and high airflow performance due to the high flow velocity.

When the air blowing grille is formed in a rectangular shape in the above configuration, the pressure loss at the four corners in the diagonal direction is particularly large and the flow is easily disturbed. Are formed at four corners of the air outlet grill inner space portion by, for example, a plate member extending radially outwardly from the rear end of the bell mouth to draw a round surface, or the same square air outlet grill inner space. Are formed by convex portions extending radially outward from the rear end of the bell mouth, which is located at the four corners of the main body casing and bulging the front portion of the main body casing, and further inside the rectangular air blowing grille. It is formed at the four corners of the space by the diverging guide vanes extending rearward from the rear end of the bell mouth, and the air flow co-under effect or divergent operation by the respective air rectifying surfaces Turbulence is prevented smooth flow of the bell mouth downstream air flow separation region being rectified by.

[0014]

As described above, according to the outdoor unit for an air conditioner of the present invention, the pressure loss and the turbulent flow in the air blowing grille portion are effectively reduced, and the outdoor unit for the air conditioner having high ventilation performance and quiet performance is provided. Machine unit can be provided.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 1 to 3 show the configuration of an outdoor unit for an air conditioner according to Embodiment 1 of the present invention.

In the drawing, reference numeral 11 denotes an outdoor unit. The outdoor unit 11 includes a box-shaped cassette casing 12, a high-energy, low-pressure-loss, high-performance heat exchanger 13 provided in a corner shape from one side surface to the back surface of the cassette casing 12, and A blower fan 14 provided in front of the heat exchanger 13 and a machine room 1 provided beside the heat exchanger 13 and the fan 14
5, an air intake grill 16 provided behind the heat exchanger 13, and an air outlet grill 17 provided in front of the fan 14.

The fan 14 is composed of, for example, a five-blade propeller fan having high static pressure performance.
The drive shaft 14d of the fan motor 14c is connected from the rear side to the base side hub 14b of FIG.
c to be driven to rotate.

The cassette casing 12 is formed as thin as possible in the front and rear directions.
The rear edge of 4a is fitted to the opening surface of the air outlet 18 formed on the front surface 12a side of the cassette casing 12 with a predetermined clearance in the radial direction so as to be substantially in the same face state. A cylindrical bell mouth 19 having the same high flow velocity improving performance as the conventional one is provided around the air outlet 1.
8 is provided in a continuous form.

On the other hand, the air outlet grille 17 is attached to the cassette casing front portion 12a having the width W by a mounting edge portion 17a from the front surface portion 12a of the cassette casing 12 in which the air outlet port 18 is formed. Width dimension W
The front side has an opening for air blowing, for example, in the upward or downward direction, or in the front direction (in the case of a vertical type, the left and right sides or the front direction). Are plate-like wind direction adjusting guides 21, 21... Which can be adjusted arbitrarily and are provided so as to be tiltable at predetermined intervals in the vertical direction.

The bell mouth 1 is provided at four diagonal corners (four corners) in a space formed according to the above-mentioned forward projection dimension W inside the air blowing grill 17.
The turbulence prevention air guides 22, 22,..., Which have a curved surface for air rectification whose curvature is gradually increased outward in the radial direction, continuously from the rear end of the air outlet grille 17, are provided in the direction adjusting guide 21 of the air blowing grill 17. , 21...

The air guides 22, 22,... Are substantially from the rear end of the bell mouth 19 as described above.
21..., The blow-out wind generated by the rotation of the fan 14 flows smoothly through the heat exchanger 13 as shown by arrows in FIGS. From the rear end of the bell mouth 1 whose flow path diameter is gradually enlarged in the direction of the air blowing grill 17
9 is blown out in a flow path form close to the funnel shape concentric with the circle. As a result, the local maximum wind speed region as in the related art is made uniform throughout, so that pressure loss is reduced and wind noise at the grill portion is also reduced. Further, the turbulent flow downstream of the bell mouth 19 as in the prior art is reduced by the air guides 22,22.
The air is rectified by the Coanda effect on the air rectification surface, and is hardly generated.

Accordingly, the conventional pressure loss and turbulent noise are greatly reduced. In addition, since the substantially cylindrical shape of the bell mouth 19 itself is not subject to any restrictions, the high blowing performance due to the original high static pressure and high flow velocity can be further improved.

(Embodiment 2) FIGS. 4 to 6 show the configuration of an outdoor unit for an air conditioner according to Embodiment 2 of the present invention.

In the drawing, reference numeral 11 denotes an outdoor unit. The outdoor unit 11 includes a box-shaped cassette casing 12, a high-energy, low-pressure-loss, high-performance heat exchanger 13 provided in a corner shape from one side surface to the back surface of the cassette casing 12, and A blower fan 14 provided in front of the heat exchanger 13 and a machine room 1 provided beside the heat exchanger 13 and the fan 14
5, an air intake grill 16 provided behind the heat exchanger 13, and an air outlet grill 17 provided in front of the fan 14.

The fan 14 is composed of, for example, a 5-bladed propeller fan having high static pressure performance.
The drive shaft 14d of the fan motor 14c is connected from the rear side to the base side hub 14b of FIG.
c to be driven to rotate.

The cassette casing 12 is formed as thin as possible in the front and rear directions.
The rear edge of 4a is fitted to the opening surface of the air outlet 18 formed on the front surface 12a side of the cassette casing 12 while maintaining a predetermined clearance in the radial direction so as to have substantially the same face state. A cylindrical bell mouth 19 having the same high flow velocity improving performance as the conventional one is provided around the air outlet 1.
8 is provided in a continuous form.

On the other hand, the air outlet grille 17 is located forward of the front surface 12a of the cassette casing 12 in which the air outlet 18 is formed by a width W of the mounting edge 17a via a mounting edge 17a having a predetermined width W. Is provided to protrude,
The opening for air blowing on the front side can be arbitrarily adjusted, for example, in the upward or downward direction, or in the front direction (in the case of a vertical type, the left and right sides or the front direction). A large number of plate-shaped wind direction adjustment guides 2
Are provided so as to be tiltable at predetermined intervals in the vertical direction.

At four diagonal corners (four corners) in the space formed according to the forward projection dimension W inside the air blowing grill 17, a front surface 12 a of the cassette casing 12 is provided. Is bulged forward to continuously form a turbulence-preventing air guide projection 32 having an air rectification radius surface whose curvature is gradually increased radially outward continuously from the rear end of the bell mouth 19. 32 are provided.

Are formed so as to extend from the rear end of the bell mouth 19 to near the wind direction adjusting guides 21, 21,... As described above. The blowing air generated by the rotation of the fan 14 smoothly flows through the heat exchanger 13 as shown by arrows in FIGS. 4 and 6, for example, and gradually flows from the rear end of the bell mouth 19 toward the air blowing grill 17. The air is blown out in a flow path form close to the funnel shape concentric with the bell mouth 19 whose path diameter is enlarged. As a result, the local maximum wind speed region as in the related art is made uniform throughout, so that pressure loss is reduced and wind noise at the grill portion is also reduced. Further, the turbulent flow on the downstream side of the bell mouth 19 as in the related art is surely rectified by the Conead effect on the air rectifying surfaces of the air guide projections 32, 32,.

Therefore, the conventional pressure loss and turbulent noise are greatly reduced. In addition, since the substantially cylindrical shape of the bell mouth 19 itself is not subject to any restrictions, the high blowing performance due to the original high static pressure and high flow velocity can be further improved.

(Embodiment 3) FIGS. 7 to 11 show the configuration of an outdoor unit for an air conditioner according to Embodiment 3 of the present invention.

In the figure, reference numeral 11 denotes the same outdoor unit. The outdoor unit 11 includes a box-shaped cassette casing 12, a high-energy, low-pressure-loss, high-performance heat exchanger 13 provided in a corner shape from one side surface to the back surface of the cassette casing 12, and A blower fan 14 provided in front of the heat exchanger 13 and a machine room 1 provided beside the heat exchanger 13 and the fan 14
5, an air intake grill 16 provided behind the heat exchanger 13, and an air outlet grill 17 provided in front of the fan 14.

The fan 14 is composed of, for example, a five-blade propeller fan having a high static pressure performance.
The drive shaft 14d of the fan motor 14c is connected from the rear side to the base side hub 14b of FIG.
c to be driven to rotate.

The cassette casing 12 is formed as thin as possible in the front and rear directions.
The rear edge of 4a is fitted to the opening surface of the air outlet 18 formed on the front surface 12a side of the cassette casing 12 with a predetermined clearance in the radial direction so as to be substantially in the same face state. A cylindrical bell mouth 19 having the same high flow velocity improving performance as the conventional one is provided around the air outlet 1.
8 is provided in a continuous form.

On the other hand, the air blowing grill 17 is provided so as to protrude forward by a predetermined dimension W from a front surface portion 12a of the cassette casing 12 in which the air blowing port 18 is formed, via a mounting edge 17a having a predetermined width W. In the opening for air blowing on the front side, the wind direction can be arbitrarily adjusted in any direction, for example, upward or downward, or in the front direction (in the case of a vertical type, the left and right sides or the front direction). A large number of plate-shaped wind direction adjustment guides 21, 21,... Are provided so as to be tiltable at predetermined intervals in the vertical direction.

Then, the cassette casing 1 at four diagonal corners (four corners) in a space formed according to the above-mentioned forward projecting dimension W inside the air blowing grill 17.
For example, as shown in FIGS. 9 to 11, the front surface 12 a of the second unit 2 is connected to the rear end of the bell mouth 19 and has turbulence prevention and air gradually inclined in the radially outward flow expanding direction. . Are provided in a state of being arranged side by side, each of which extends in the direction of air blowing.

The diverging guide vanes 42, 42,.
Each blade 42 of the group extends from the rear end of the bell mouth 19 in the air blowing direction as described above, and is inclined in the direction opposite to the rotation direction of the blade 14 a of the fan 14. Therefore, the blowing air generated by the rotation of the blades 14a of the fan 14 passes through the bell mouth 19, and then expands as shown by arrows in FIGS. The flow path is rectified and rectified to flow smoothly, and in particular, a flow path form close to a funnel shape concentric with the bell mouth 19 whose flow path diameter is gradually increased from the rear end of the bell mouth 19 toward the air blowing grill 17 is adopted. It will be blown out by the same action. As a result, the local maximum wind speed region as in the related art is made uniform throughout, so that pressure loss is reduced and wind noise at the grill portion is also reduced. Further, almost no turbulence is generated downstream of the bell mouth 19 as in the prior art.

Therefore, the conventional pressure loss and turbulent noise are greatly reduced. In addition, since the cylindrical shape of the bell mouth 19 itself is not restricted at all, it is possible to further improve the high blowing performance by the original high flow velocity and high static pressure.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view (AA in FIG. 2) showing a configuration of an outdoor unit for an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a front view of the outdoor unit.

FIG. 3 is an enlarged cross-sectional view (BB in FIG. 2) of a main part of the outdoor unit.

FIG. 4 is a vertical cross-sectional view (CC of FIG. 5) showing a configuration of an outdoor unit for an air conditioner according to Embodiment 2 of the present invention.

FIG. 5 is a front view of the outdoor unit.

FIG. 6 is an enlarged cross-sectional view (DD in FIG. 5) of a main part of the outdoor unit.

FIG. 7 is a longitudinal sectional view (EE in FIG. 8) showing a configuration of an outdoor unit for an air conditioner according to Embodiment 3 of the present invention.

FIG. 8 is a front view of the outdoor unit.

FIG. 9 is an enlarged cross-sectional view (FF of FIG. 8) of a main part of the outdoor unit.

FIG. 10 is a partially enlarged front view showing a detailed structure and operation of a flow spreading guide blade in a main part of the outdoor unit.

FIG. 11 is a view G of FIG. 10 showing the structure of the divergent guide vane.
FIG.

FIG. 12 is a vertical cross-sectional view (HH of FIG. 13) showing a configuration of an outdoor unit for an air conditioner according to a conventional example.

FIG. 13 is a front view of the outdoor unit.

FIG. 14 is an enlarged sectional view of a main part of the outdoor unit (FIG. 1);
3I-I).

FIG. 15 is an enlarged sectional view of a main part of the outdoor unit (FIG. 1);
3 JJ)).

[Explanation of symbols]

11 is an outdoor unit, 12 is a cassette casing, 1
3 is a heat exchanger, 14 is a fan, 18 is an air outlet, 19
Is a bell mouth, 21 is a wind direction adjusting guide, 22 is an air guide, 32 is an air guide projection, and 42 is an air guide expansion guide blade.

Claims (5)

[Claims] 1. An outdoor unit for an air conditioner having an air blowing grille having a diameter larger than that of the bell mouth and protruding downstream from a rear end of a cylindrical bell mouth of a blower fan blade portion by a predetermined size in an air flow direction. An outdoor unit for an air conditioner, comprising: an air guide portion having an air flow rectifying surface extending in the direction of the air blowing grill in a state continuous from the rear end of the bell mouth. 2. An outdoor unit for an air conditioner, comprising a rectangular air outlet grill having a diameter larger than that of the bell mouth and protruding downstream from a rear end of a cylindrical bell mouth of a blower fan blade at a predetermined size in the direction of air flow. An outdoor unit for an air conditioner, wherein an air guide portion having an air flow rectifying surface extending in a direction of the air blowing grill is provided in a continuous state from a rear end of the bell mouth. 3. The air guide portion is formed by a plate member located at four corners of a rectangular air outlet grill inside space portion and extending radially outward from a rear end of the bell mouth in a radius direction. The outdoor unit for an air conditioner according to claim 2, wherein: 4. The air guide portion is located at the four corners of the inner space of the rectangular air blowing grill and extends radially outward from the rear end of the bell mouth with the front portion of the main body casing bulging. The outdoor unit for an air conditioner according to claim 2, wherein the outdoor unit is formed by a convex portion. 5. The air guide part is formed by flow guide blades located at four corners of a rectangular air outlet grill inside space part and extending rearward from the rear end of the bell mouth. The outdoor unit for an air conditioner according to the above.