JPS5925927B2 - Air conditioner indoor unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an indoor unit for a split type air conditioner.

Traditionally, cross-flow fans or sirocco fans were used as blowers for indoor units installed on indoor walls, but recently, rear-facing centrifugal fans have been used to make the units as thin as possible. Ta.

As shown in FIG. 1, the indoor unit using the backward-facing centrifugal fan has a pair of centrifugal fans b, b installed inside the indoor unit main body a, and A bell mouth d having a suction opening el is installed at the bottom.

Furthermore, the suction openings c, c have a slightly larger diameter than the diameters of the centrifugal fans b, b, and a gap e of 5 to 10 is formed around the periphery. The lower side of b is configured to be close to the drain pan f.

However, when testing the suction distribution in the indoor unit configured as described above, as shown in FIG. 2, there is a large amount of suction from the lower side of the suction opening C+C.

(The suction distribution is indicated by diagonal lines.) Therefore, there is a deviation between the suction opening CeC and the suction distribution, and in the range g in FIG. 1, suction is drawn from the gap e.

For this reason, the suction efficiency was poor, causing noise when the air volume was less than that.

This invention was made based on the above circumstances, and its purpose is to make the suction opening of the bell mouth into a shape that matches the suction distribution, to improve suction efficiency and increase air volume, and to reduce noise. The purpose of this invention is to provide an indoor unit of an air conditioner that can reduce the air pressure.

The present invention will be explained below based on an embodiment shown in FIGS. 3 and 4.

In the figure, reference numeral 1 denotes the main body of an indoor unit of an air conditioner, and a suction port 2° is provided at the front of the unit, and a discharge port 3 is provided at the bottom.

An indoor heat exchanger 4 is provided in front of the suction port 2, and a drain pan 5 is provided below the heat exchanger 4.

Additionally, a fan motor 6 is installed inside the indoor unit main body 1.
A pair of backward-facing centrifugal fans 7 mounted on a 60-rotation shaft
．． 7 are installed, these are fan casings 8,
It is surrounded by 8.

Furthermore, a bell mouth 9 is installed on the front surface of the fan casings 8, 8, and this bell mouth 9 has a suction opening 10 facing the rearward-facing centrifugal fan 7.7,
10 are provided.

The upper half of these suction openings 10.10 is arcuate along the outer periphery of the centrifugal fan 7.7, and the lower half is cut out and extends to the upper end surface of the drain pan 5.

Therefore, cutout openings 10a, 10a are provided on both sides of the lower part of the centrifugal fan 7.7.

When the rear-facing centrifugal fan 7.7 is driven to rotate by the fan motor 6.6, indoor air is sucked in through the suction port 2 and heat exchanged by the heat exchanger 4.

This heat exchange air is supplied to the suction opening 10.10 of the bell mouth 9.
．． From the notch opening IQa, 10a to the fan casing 8,
8 and is discharged from the discharge 'D3 by a rear-facing centrifugal fan 7.7.

Therefore, the amount of suction from the suction opening 10.10 increases, making it possible to increase the amount of air.

In the above embodiment, a case was described in which a pair of fans were installed in parallel within the unit main body, but the same effect can be obtained when a single fan is installed within the unit main body.

As explained above, in this invention, since the suction opening of the bell mouth facing the centrifugal fan is extended to the upper end surface of the drain pan installed at the bottom, the amount of suction from between the centrifugal fan and the bell mouth is increased. Suction efficiency can be improved.

therefore. This has the effect of increasing the amount of air blown and reducing noise.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional indoor unit (heat exchanger); Fig. 2 is an explanatory diagram showing the suction distribution; 1...Indoor unit main body, 2...Suction port, 3...Discharge port, 4...Heat exchanger,
5... Drain pan, 7... Centrifugal fan, 9... Bell mouth, 10... Suction opening.

Claims (1)

[Claims] 1. An indoor unit main body having a suction port at the front and a discharge port at the bottom, a heat exchanger installed inside this main body and facing the above-mentioned suction port, and a centrifugal unit installed inside the above-mentioned main body opposite to this heat exchanger. An indoor unit for an air conditioner, comprising: a fan; and a bell mouth extending to the upper end surface of a drain pan provided between the heat exchanger and the centrifugal fan and having a suction opening at the bottom.