JPH0136028Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a heat exchange unit that is optimal for the outdoor unit of an air conditioner.

(b) Conventional technology Conventionally, in outdoor units that installed a heat exchanger only on the rear side, sucking in outside air from the intake port on the back and discharging it forward from the exhaust port on the front, heat exchange air was exchanged from the back. Since the structure was such that it was sent straight forward by the propeller fan, the heat exchange air was smoothly guided into the bell mouth of the propeller fan provided at the exhaust port, and there was no problem with noise caused by the airflow.

However, when adopting a structure in which the heat exchanger is made thinner in order to make the unit casing thinner, and the heat exchanger is extended to the side of the casing to compensate for the reduction in thickness and arranged in a planar L-shape, Since outside air is taken in from both the back and side intake ports, the main outside airflow from the back is deflected by the outside airflow from the sides and led to the bell mouth, causing noise. This is because the drifted flow stagnates in the space formed at the top and bottom front corners of the bell mouth (the left and right front corners of the bell mouth have a heat exchanger on one side and a partition wall from the machine room on the other side) (Therefore, there is no space large enough for the drift to stagnate.)
However, this drifting current interferes with the outer tip of the propeller fan, producing a whining sound.
(900rpm or higher), it became noticeable and became audible.

(c) Purpose of the invention The object of this invention is to provide a heat exchange unit that smoothly guides outside airflow from the back and sides into the bell mouth of the propeller fan, thereby preventing the generation of humming noise.

(d) Structure of the invention This invention consists of a heat exchanger arranged in a roughly L-shape inside the housing along the intake ports on the back and sides, and a heat exchanger located in front of this heat exchanger for heat exchange from the front of the housing. In a heat exchange unit equipped with a propeller fan that discharges air, a guide tool that guides heat exchange air to a bell mouth of the propeller fan at a corner portion formed by the front surface and at least one other side surface adjacent to the side surface. It has been established.

(e) Embodiment Figure 1 is a plan view of a heat exchange unit showing an embodiment of the present invention, and Figure 2 is a sectional view taken along the line -' in Figure 1. A heat exchanger 7 is disposed in a substantially L-shape in plan inside the housing 6, and an exhaust port 8 is located in front of the heat exchanger.
A propeller fan 9 discharges heat exchange air from the front panel 10, a bell mouth of the propeller fan 7 formed integrally with the front plate 10 or separately, and a bell mouth 11 of the propeller fan 7 discharging heat exchange air from the front plate 10; 14 is a partition wall, 15 is a lower end fixed to a bottom plate 16, and an upper end is a mounting leg for a fan motor 17 that holds the heat exchanger 1. 18 is an exhaust guard.

The bottom plate 16 and the top plate 19 on the other side adjacent to the side 3 with the intake port 5 have front edges 2 on their inner walls, respectively.
Short plate-shaped guide tools 22 and 23 are welded to the bottom of the bell mouth 9 at their centers. That is, the corner portions 24 formed by the bottom plate 16 and the front plate 10 and the top plate 19 and the front plate 10,
25 is a guide tool 2 that is somewhat longer than the diameter of the bell mouth 9.
2 and 23 are provided vertically symmetrically to smoothly guide heat exchange air to the bell mouth 9, and the front plate 10 is reinforced using the guide tool 23 as a bracing.

Therefore, when the outside air sucked in from the back side 2 and side faces 3 passes through the heat exchanger 1 and is discharged from the front exhaust port 8 by the propeller fan 7, the main outside air flow from the back side 2 is the outside air flow from the side face 3. Deflect and corner part 2
Even if the drifting flow is pushed toward 4 and 25, corner part 2
Due to the guide tools 22 and 23 that close the corners 4 and 25, the drifted flow is smoothly guided to the bell mouth 9 without being stagnated at the corner portions 24 and 25, and is promptly discharged from the exhaust port 8. In this way, it was confirmed that interference between the drifting current and the propeller fan 7 was almost eliminated, and no unpleasant whining noise was generated.

Also, when operating with the lower guide 22 removed, a slight whining noise is generated, but compared to a conventional unit that does not have the guide 23, the harsh noise is extremely reduced, and even just one guide 23 makes a whining noise. It has also been experimentally proven that it contributes significantly to sound prevention measures.

In the above embodiment, the unit structure is explained in which the intake ports 4 and 5 are provided on the back surface 2 and the right side surface 3 of the casing 6, but it is also possible to arrange one of the intake ports 5 on the bottom plate 16 or the top plate 19. The present invention can also be applied to a unit structure in which the heat exchanger 1 is arranged in a substantially L-shape or a substantially inverted L-shape when viewed from the side.

(F) Effects of the invention According to this invention, the generation of unpleasant whining noise can be prevented by providing a simple structure in which a guide device is provided to guide heat exchange air to the bell mouth of the propeller fan at the corner where drifting flow stagnates. .

Moreover, the front plate can be reinforced by using the guide as a brace.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a heat exchange unit showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line -' in FIG. 1... Heat exchanger, 2... Back, 3... Side,
4, 5... Intake port, 6... Housing, 7... Propeller fan, 9... Bell mouth, 10... Front (board),
16, 19...Other sides (bottom plate, top plate), 22,
23... Guide tool, 24, 25... Corner part.

Claims (1)

[Scope of utility model registration request] A heat exchanger is arranged in a roughly L-shape inside the housing along the intake ports on the back and sides, and a propeller fan is located in front of the heat exchanger and discharges heat exchange air from the front of the housing. A heat exchange unit comprising: a guide device for guiding heat exchange air to a bell mouth of a propeller fan at a corner formed by at least one other side surface adjacent to the side surface and the front surface.