JP2577374B2 - Air conditioner indoor unit - Google Patents

Description

The present invention relates to an indoor unit of an air conditioner provided with a plurality of cross flow fans surrounded by a fan casing.

(Prior Art) In an indoor unit of a split type air conditioner, a plurality of cross flow fans are provided in the unit body in a vertically separated manner so that heat exchange air can be blown out from upper and lower portions of the unit body. There is. This is generally configured as shown in FIG. That is, reference numeral 1 denotes an upper horizontal flow fan, and 2 denotes a lower horizontal flow fan, which are provided inside and parallel to the fan casing 3 at a distance. Both ends of the upper and lower cross flow fans 1 and 2 in the axial direction are inserted into recesses of the left and right side surfaces 4 and 5 of the fan casing 3. Is installed. Then, it is configured such that the room air is sucked in from the front center, distributed vertically in the fan casing 3 and blown out from the upper and lower parts of the unit body.

When the left and right side surfaces 4, 5 of the fan casing 3 are flat surfaces as shown in FIG. 4, the air generated from the upper and lower cross flow fans 1, 2 is rectified.
Nevertheless, when the upper and lower cross flow fans 1 and 2 are rotating at the same time, or when the air volume is switched, it takes time for the air to stabilize due to various factors such as breathing noise, rumbling sound, and drift of the air flow. Sound may not disappear.
Further, as shown in FIG. 5, when an electrical box 7 is installed on one side of the unit body, for example, on the right side, a bulging portion 8 projecting vertically symmetrically inside the fan casing 3 on the right side 5 of the fan casing 3. It is formed. Further, as shown in FIG. 6, right and left side surfaces 4 and 5 of the fan casing 3 may be formed with symmetrical bulging portions 8 and 8, respectively. Further, as shown in FIG. 7, when the lower outlet 9 of the unit main body is made larger (the length of the lower cross flow fan 2 is also made larger) to increase the cooling and heating capacity of the lower outlet 9, the right side of the fan casing 3 is used. A notch 5a is formed in the surface 5.

(Problems to be Solved by the Invention) As described above, when an electrical box is installed on one or both sides of the unit main body, or when the lower outlet is enlarged, a bulging portion or a notch is formed on the side surface of the fan casing. Can be
As a result, there is a drawback that the side surface is deformed and the ventilation resistance is increased, which causes an abnormal sound. Further, if the bulge is not formed in the fan casing, the internal volume of the fan casing becomes small, and a sufficient air volume cannot be obtained.

The present invention has been made in view of the above circumstances, and an object of the invention is to provide an air conditioner that does not generate abnormal noise even when the side surface of a fan casing is deformed and that can secure a sufficient air volume. To provide an indoor unit.

[Configuration of the invention]

(Means and Actions for Solving the Problems) According to the present invention, a plurality of crossflow fans are installed in a unit main body vertically separated from each other, and a fan casing that covers the back surface and both side surfaces of these crossflow fans is provided. Further, at least one side surface of the fan casing has a deformed shape, and a rear surface located on the side surface of the deformed shape of the fan casing projects forward from the side surface with a section equal to or more than the first connection portion of the cross flow fan. A rectifying rib is provided in the vertical direction, and a rectifying ripple portion is formed on the back surface located in the section at a right angle to the rectifying rib, and the streamline is stabilized by the rectifying rib and the rectifying ripple.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded view of the indoor unit.
Is a unit body. The unit main body 11 is basically constituted by a rear panel 12 and a front panel 13, and the rear panel 12 has a fan casing 14 described later,
The front panel 13 is provided with a fin tube type heat exchanger 15.

The fan casing 14 is formed of a synthetic resin material, and has a back surface 16 and left and right side surfaces 17 and 18. An upper horizontal flow fan 19 is provided at an upper portion of the fan casing 14, and a lower horizontal flow fan 20 is provided at a lower portion. Both of the horizontal flow fans 19 and 20 have both ends in the axial direction formed on the left and right side surfaces 17 and 18 of the fan casing 14. It is rotatably supported. Motors 21 and 22 are provided at one end of the upper and lower cross flow fans 19 and 20, respectively, and can be independently driven to rotate. Further, the right side surface 18 of the fan casing 14
An electrical box 23 containing various electrical components is provided inside the unit main body 11 located outside the unit.

The front panel 13 has the heat exchanger 15 at the center of the front.
And outlets 25 and 26 are provided at upper and lower portions. Air filters 27, 27 are detachably provided inside the front panel 13 facing the suction port 24. Further, an upper nose 28a is provided above the heat exchanger 15.
However, a lower nose 28b serving as a drain pan is provided at a lower portion.

Upper cross flow fan of indoor unit configured as above
Referring to FIG. 2, the fan 19 and the lower cross flow fan 20 will be described in detail. These are end plates 29, 29 composed of a pair of disks, and a number of blades installed between the end plates 29, 29 along the outer peripheral edge thereof. 30 are formed in a cylindrical shape by coaxially connecting the fan constituent members 31 formed with the fan members 30. Therefore, the connecting parts 32 of the fan constituent members 31 exist at regular intervals. In addition, this upper and lower cross flow fan 1
2 and 3, the right side surface 18, that is, the side adjacent to the electrical box 23, protrudes into the fan casing 14 as shown in FIGS. 33 are provided and are oddly shaped. Further, a fan casing located on the side of the bulging portion 33
A rectifying rib 34 protruding forward is provided between the upper cross flow fan 19 and the lower cross flow fan 20 on the rear surface 16 of the 14 in the vertical direction. Moreover, the rectifying rib 34 is located slightly in the direction of the left side 17 from the position facing the first connecting portion 32a of the upper and lower lateral flow fans 19 and 20, and the back of the section 35 between the rectifying rib 34 and the right side 18 is provided. A rectifying ripple is provided on the rectifying rib at a right angle to the rectifying rib and parallel to the upper and lower cross flow fans. In addition, the height of the rectifying ripple 36 is lower than that of the rectifying rib 34, and the rectifying ripple 36 is biased toward the upper cross flow fan 19 side.

Next, the operation of the indoor unit configured as described above will be described. The abnormal sound in the case of vertical blowout by the upper and lower crossflow fans 19 and 20 is indicated by the dashed line in FIG. Part) is bent by dynamic pressure and bends, and the partial load increases. As a result, it occurs when the streamline returns as shown by the solid line. When viewed from the side, as shown in FIG. 3, when the air that has entered at the dashed line is drawn by the negative pressure portion formed by the lower cross flow fan 20 as shown by the solid line, or vice versa. It is said to occur in the case of.

However, the rectifying rib 34 and the rectifying ripple
By providing 36, the one-dot chain line streamline is blocked by the rectifying rib 34 in the front direction, and is stabilized like the two-dot chain line to the solid streamline. In addition, when viewed from the side, the rectifier ripple 36 shifts from the one-dot chain line to the two-dot chain line and furthermore as shown by the solid line, and the streamlines are vertically distributed and stabilized. Therefore, the air streamline inside the fan casing 14 is stabilized,
The occurrence of abnormal sounds can be reduced. The reason why the rectifying ribs 34 are installed at a distance from the first connecting portion 32a is to prevent wind disturbance inside the fan.

In the embodiment, the fan casing 14
The right side 18 of the left side 17
If the shape is irregular, the rectifying rib 34 and the rectifying ripple 36 may be provided on the left side. When both the right and left side surfaces 17 and 18 are odd-shaped, the rectifying rib 34 and the rectifying ripple 36 may be provided on both sides, and providing only one of them has an effect.

In addition, the case where one crossflow fan is provided above and below the fan casing has been described. However, the number of the crossflow fans is not limited, and as shown in FIG. When only the lower portion is elongated, a similar effect can be obtained also in the case of a variant having a cutout formed on the side surface of the fan casing.

〔The invention's effect〕

As described above, according to the present invention, even if the side surface of the fan casing is irregular, the streamlines of the air can be stabilized by the rectifying ribs and the rectifying ripples, so that a sufficient air volume can be secured and abnormal noise can be obtained. Can be greatly reduced.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention.
FIG. 1 is an exploded perspective view of an indoor unit, FIG. 2 is a vertical sectional front view of a main part, FIG. 3 is a vertical side view of a main part, and FIGS.
The figure is a vertical front view of a conventional indoor unit. 11 ... unit body, 14 ... fan casing, 16 ...
Back, 17, 18… Side, 19, 20… Cross flow fan, 34…
Rectifier rib, 36 ... Rectifier ripple.

Claims (1)

(57) [Claims] A plurality of cross flow fans which are vertically spaced apart from each other inside a unit body, and a fan casing which covers a back surface and both side surfaces of the cross flow fans is provided;
The air sucked from the front part of the unit main body is blown out from the upper and lower parts of the unit main body, and at least one side surface of the fan casing is located on the side of the deformed fan casing in the indoor unit of the air conditioner. On the rear surface, a straightening rib protruding forward from the side surface with a section equal to or more than the first connection part of the cross flow fan is provided vertically, and the straightening rib is formed at a right angle with the straightening rib on the rear face located in the section. An air conditioner indoor unit comprising a rectifying ripple portion.