JPH102582A - Outdoor machine for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the cooling efficiency of electric appliances and improve the heat exchanging performance of a heat exchanger by a method wherein an air intake port is formed on a scroll wall of the side of electric appliances. SOLUTION: The scroll wall of a scroll unit 10 at the downstream side of a heat exchanger 3 and a cross flow fan 2, which are opposed to a machine room space 13, is provided with an air intake port 20 for a ventilating air passage 12, making the machine room space 13 communicate with the downstream side of the ventilating air passage 12 mutually. When air flows through the ventilating air passage 12 in a scroll unit 10 by the driving of a cross flow fan 2, outdoor air is sucked from the opening unit 21 of the rear surface side wall of a casing 7 through the slit 20a of the air intake port 20 by venturi effect generated by the flow of air while the air is introduced into the downstream side of the ventilating air passage 12 through the machine room space 13 whereby effective cooling air is formed around various electric appliances 6 including heat generating electric parts (especially around the heat radiating part of fins and the like).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the structure of an outdoor unit for an air conditioner.

[0002]

2. Description of the Related Art In a conventional outdoor unit for an air conditioner, a heat exchanger bent in, for example, an L-shape is disposed in a box-shaped outdoor unit casing, and a rear-side corner portion of the heat exchanger is provided. Provide a propeller fan to form a heat exchange unit,
Furthermore, a machine room having a compressor and electrical components is arranged adjacent to one side of the device via a partition wall.

By the way, among the electric components provided through the heat exchange unit and the partition wall as described above, there are heat-generating electric components such as a power transistor for controlling the operation of the compressor. These are generally provided with heat radiating means such as heat radiating fins, but they cannot provide a sufficient heat radiating effect.

Therefore, in the conventional configuration, the electrical components are provided by connecting the air intake port formed on the partition wall side to the negative pressure chamber between the heat exchanger on the heat exchange unit side and the fan. An air flow for cooling electrical components is formed in a machine room provided with the above.

[0005]

However, as described above, when the mechanical component side is connected to the negative pressure chamber on the downstream side of the heat exchanger so as to form a cooling flow for electrical components, the cooling flow passes through the heat exchanger accordingly. There is a problem that the heat exchange efficiency and the energy efficiency are reduced because the amount of air generated is reduced.

[0006]

SUMMARY OF THE INVENTION The present invention has been made for the purpose of solving the above problems, and is provided with the following means for solving the problems.

That is, first, the outdoor unit for an air conditioner of the present invention, as shown in FIGS. 1 to 4, for example, has an air inlet 12a of an air passage 12 formed with a scroll portion 10.
A cross flow fan 2 is provided in the vicinity, a heat exchanger 3 is provided around the outside of the cross flow fan 2, and a heat-generating electrical component 16 is provided in a space 13 inside the casing 7 outside the scroll portion 10. In the outdoor unit for an air conditioner, an air inlet 2 is provided on the scroll wall on the side of the electrical component 6.
0 is formed.

Therefore, the air intake 2 formed in the scroll wall is formed by the Venturi effect of the air flow flowing through the heat exchanger 3 formed by the scroll portion 10 and the air flow path 12 downstream of the cross flow fan 2.
From 0, the air in the space of the casing 7 having the heat-generating electrical components 6 is guided toward the downstream air outlet of the air passage 12. As a result, a sufficient electrical component cooling flow is formed in the space inside the casing 7 having the electrical component 6, and the electrical components are efficiently cooled.

Further, in the above configuration, the air intake 2
0 is formed downstream of the heat exchanger 3 and the cross flow fan 2, so that the amount of air passing through the heat exchanger 3 does not change at all, and the heat exchange efficiency of the heat exchanger 3 is reduced. Nothing to do.

In the above structure, an opening 21 for air introduction opened to the outside of the casing 7 is provided.
Is provided, the cooling flow is more smoothly formed, so that the cooling efficiency of the electrical component 6 is further improved.

Further, as described above, the opening 21 for introducing air is provided.
Is provided, for example, the area of the opening 21 is formed to be larger than the area of the air intake 20, and the air is smoothly introduced. Further, the flow of the air on the side of the air passage 12 at the air intake 20 is less disturbed.

In each of these cases, the heat radiating portion of the electrical component 6 is, for example, in the middle of an air flow passage extending from the air introduction opening 21 to the air intake 20 or opposed to the air intake 20. In particular, a region having a particularly high cooling efficiency such as a position where the cooling efficiency is high is selected and disposed.

[0013]

As described above, according to the outdoor unit for an air conditioner of the present invention, sufficient cooling performance of electrical components can be realized without lowering the heat exchange efficiency of the heat exchanger.
It is possible to guarantee product reliability while ensuring high energy efficiency.

[0014]

1 to 3 show the construction of an outdoor unit for an air conditioner according to an embodiment of the present invention.

First, in the figure, reference numeral 1 denotes the same outdoor unit. The outdoor unit 1 includes a heat exchange unit 1A including, for example, a cross flow fan 2, a heat exchanger 3, a fan motor 4, and the like, and a compressor 5, refrigerant pipes 5a, 5a,
It comprises a machine room unit 1B provided with various electrical components 6 including heat-generating electrical components such as power transistors, and these two unit portions 1A and 1B are displaced substantially on both sides (in a diagonal direction) via a scroll portion 10. Both sides are appropriately disposed and integrated, and housed in a vertically long cassette type casing 7, and are formed in a vertically long, thin and slim structure as a whole.

The casing 7 of the outdoor unit 1
The first and second tapered surfaces are formed such that a central portion on the front side is formed on a flat surface 7a, and both left and right portions of the flat surface 7a are inclined with a slight radius from the front surface to the rear side. 7b and 7c.

In the heat exchange unit 1A, three surfaces from the front flat surface 7a to the right second tapered surface 7c and the right surface 7d of the casing 7 are formed into a substantially U-shaped section as described later. While formed on the air suction grill portion corresponding to the wide outer peripheral surface of the bent heat exchanger 3, the first tapered surface 7 b on the front left side corresponds to an air outlet 12 b of the air passage 12 described later. It is formed in the air blowing grille section.

Then, as described above, the front side flat surface 7
a to the right side second tapered surface 7c and the right side surface 7d, the space inside the air suction grille section is formed so as to extend along the bending direction from each surface to the back surface 7e. A heat exchanger 3 which is bent into a substantially U-shape to have a bent structure is provided. As will be described in detail later, the heat exchanger 3 has a rear end 3 b at a scroll portion 10.
And is arranged to extend straight behind the upstream end 10a by a predetermined length L.

The front and rear ends of the heat exchanger 3 located near the center in the rear side from the inside of the air blow-out grill portion are provided inside the air blow-out grill portion formed on the front left tapered surface 7b. A scroll portion 10 is provided extending in a parabolic shape as shown in the drawing to a position closer to the inner side between the portions 3a and 3b, and a scroll portion 10 is provided in the scroll portion 10 from a downstream portion of the heat exchanger 3 to the air blowing grill portion. An air passage 12 for the cross flow fan 2 is formed. The air inlet 12a of the air passage 12 is connected to the air suction grill through the heat exchanger 3, and the air outlet 12b is connected to the air outlet grill. As described later, a compressor 5 and a refrigerant pipe (communication pipe) for the compressor 5 are provided in a space (a diagonal corner) inside the casing on the rear side of the scroll section 10 forming the air passage 12. ) 5a, 5
a, Machine room space 1 in which the above-mentioned various electrical components 6 are installed
3 extend in the up-down direction.

The scroll wall of the scroll unit 10 downstream of the heat exchanger 3 and the cross flow fan 2 corresponding to the machine room space 13 includes the machine room space 13 and the downstream side of the air passage 12. Are formed in an air intake port 20 on the side of the air passage 12 that communicates with each other. The air intake 20 is formed by a plurality of slits 20a parallel to the longitudinal direction of the scroll 10, as shown in FIG. 1, for example.

On the other hand, an opening 21 which is open to the outside for introducing external air into the machine room space 13 is formed in the rear side wall of the casing 7. As a result,
An air flow passage is formed from the opening 21 to the air intake 20 through the heat radiating portions (fins and the like) of the various electrical components 6.

When air flows into the air passage 12 in the scroll section 10 by driving the cross flow fan 2, the slits 20a, 20a,
The outside air is sucked from the opening 21 through the openings 20a, and flows to the downstream side of the air passage 12 through the machine room space 13 so as to surround the various electric components 6 including the heat-generating electric components (particularly, , Around the heat radiating portion).

On the heat exchange unit 1A side,
A fan motor 4 for driving the cross flow fan 2 is provided above the cross flow fan 2, while the refrigerant pipes 5 a, 5 a of the compressor 5 extend upward on the machine room unit 1 B side. By providing the joints (closing valves and the like) 5b, 5b, a top joint structure that can be easily connected to the indoor unit is realized.

The inside of the front and rear ends 3a and 3b of the heat exchanger 3 having a substantially U-shaped cross section and the scroll portion 1
A cross flow fan 2 is provided near the air suction port 12a of the air passage 12 formed by the air flow path 0 and extends in the up-down direction. The cross flow fan 2 has its lower end (not shown) rotatably supported by a bearing provided on the bottom wall (not shown) of the casing 7 on the heat exchange unit 1A side. On the other hand, the upper end of the rotating shaft 14 is connected to the heat exchange unit 1 of the casing 7.
The fan motor 4 can be driven by being connected to a drive shaft 4a of the fan motor 4 which is fixedly provided on the lower surface side of the A-side ceiling wall via a mounting bracket (not shown).

Therefore, when the fan motor 4 is driven, the cross flow fan 2 is rotated by the fan motor 4 and the outside air is sucked in from the air suction grille side, so that the heat exchanger 3 and the cross flow The air that has been heat-exchanged through the fan 2 and the air passage 12 is efficiently blown to the outside from the air blowing grill portion.

In this case, the rear end portion 3b of the heat exchanger 3 extends straight behind the upstream end 10a of the scroll portion 10 by a predetermined length L, and the extension line a thereof extends along the scroll portion. It is configured to intersect the tangent b of the virtual round surface R of the upstream end 10a. As a result, the machine room space 13 having a sufficient size as described above is formed between the scroll portion 10 and the casing 7, and the flowability of the air flowing into the cross flow fan 2 through the extension portion is improved, Heat exchange performance is improved.

As described above, first, in the outdoor unit for an air conditioner according to the embodiment of the present invention, the cross-flow fan 2 is provided near the air suction port 12a of the air passage 12 formed with the scroll portion 10. The heat exchanger 3 is disposed around the cross flow fan 2 and various electric components 6 including heat-generating electric components are provided in a machine room space 13 which is a space inside the casing 7 outside the scroll portion 10. In the air conditioner outdoor unit arranged, an air intake port 20 is formed in a scroll wall of the scroll unit 10 corresponding to the machine room space 13.

Therefore, the air inlet 20 formed in the scroll wall is formed by the Venturi effect by the air flow flowing through the heat exchanger 3 formed by the scroll portion 10 and the air flow path 12 downstream of the cross flow fan 2.
Therefore, the air in the machine room space 13 having the various electrical components 6 is guided toward the downstream air outlet 12 b of the air passage 12. As a result, an effective electrical component cooling flow is formed in the machine room space 13 having the various electrical components 6, and the heat-generating electrical components are efficiently cooled.

In the above structure, the airflow opening 21 is provided at the side wall of the rear surface 7e of the casing 7, and the cooling flow is more smoothly formed, and the cooling efficiency is improved. Is more effectively improved.

Further, since the air inlet 20 is formed downstream of the heat exchanger 3 and the cross flow fan 2, the amount of air passing through the heat exchanger 3 does not change at all, and There is no decrease in the heat exchange efficiency of the exchanger 3.

As a result, according to the air conditioner outdoor unit 1 having the above configuration, sufficient cooling performance of electrical components can be realized without lowering the heat exchange efficiency of the heat exchanger 3.
It is possible to guarantee product reliability while ensuring high energy efficiency.

(Modification) In the above description, the air intake 20 formed in the scroll wall of the scroll portion 10 is formed by the vertically elongated slits 20a, 20a,. For example, as shown in FIG. 4, even if it is formed by a plurality of circular holes 20b, the same operation and effect can be obtained.

Further, as described above, the opening 2 for introducing air is provided.
In the case where 1 is provided, for example, the area of the air introduction opening 21 is formed to be larger than the area of the air intake port 20, and the air is smoothly introduced. In addition, the air passage 12 in the air intake 20 portion is better.
The air flow on the side is not disturbed.

Further, in each of the above cases, the heat radiating portion of the electrical component 6 is, for example, the air having the highest air flow through the air flow passage from the air introduction opening 21 to the air intake 20. A region having particularly high cooling efficiency, such as an intermediate portion of the flow passage or a position directly facing the air intake 20, is selected and appropriately disposed.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of an outdoor unit for an air conditioner according to an embodiment of the present invention as viewed from the front side.

FIG. 2 is a schematic horizontal sectional view as viewed from above the outdoor unit.

FIG. 3 is a schematic sectional view showing an operation of a main part of the outdoor unit.

FIG. 4 is a partially enlarged view showing a modified example of a main part of the outdoor unit.

[Explanation of symbols]

1 is an outdoor unit, 1A is a heat exchange unit, 1B is a machine room unit, 2 is a cross flow fan, 3 is a heat exchanger, 4 is a fan motor, 5 is a compressor, 6 is electrical equipment, 7
Is a casing, 10 is a scroll portion, 10a is an upstream end of the scroll portion, 12 is an air passage, 12a is an air inlet of the air passage, 20 is an air intake, and 21 is an opening.

Claims (5)

[Claims] 1. A cross flow fan (2) is provided near an air suction port (12a) of an air passage (12) formed with a scroll portion (10), and is provided around an outer periphery of the cross flow fan (2). While arranging the heat exchanger (3),
An outdoor unit for an air conditioner in which a heat-generating electrical component (6) is disposed in an inner space (13) of a casing (7) outside the scroll portion (10), wherein the scroll on the electrical component (6) side is provided. An outdoor unit for an air conditioner, wherein an air intake (20) is formed in a wall. 2. The outdoor unit for an air conditioner according to claim 1, wherein an opening (21) opened to the outside is formed in the casing (7). 3. The outdoor unit for an air conditioner according to claim 1, wherein an area of the opening (21) is formed to be larger than an area of the air intake (20). 4. An air intake (2) through an opening (21).
The outdoor unit for an air conditioner according to claim 1, 2 or 3, wherein a heat radiating portion of the electrical component (6) is provided in the air flow passage leading to (0). 5. The air conditioner according to claim 1, wherein the heat radiating portion of the electrical component (6) is disposed at a position facing the air intake port (20). Outdoor unit.