JPH0442646Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention relates to improvement of an indoor unit of an air conditioner.

<Prior Art> Conventionally, there is an indoor unit for an air conditioner as shown in a schematic diagram in FIG. 6b. This indoor unit has a heat exchanger 1, a cross flow fan 2, and a drain pan 3, and by the rotation of the cross flow fan 2, suction is drawn from the room, and after heat exchange is performed in the heat exchanger 1. Air is again sent into the room from the air outlet 4. At this time, the condensed water condensed by the heat exchanger 1 falls downward, is collected in the drain pan 3 arranged below the heat exchanger 1 with a gap 5, and is discharged to the outside. Ru.

<Problems to be solved by the invention> However, in the above-mentioned conventional air conditioner indoor unit, since there is a gap 5 between the drain pan 3 and the lower surface of the heat exchanger 1, the heat exchange pipe There is a large speed difference between the airflow passing through the cross-fin coil type heat exchanger 1 in which the heat exchanger 1 is stretched and the airflow passing through the narrow gap 5 between the exchanger 1 and the drain pan 3. Therefore, due to this speed difference in airflow, air blowing noise (hereinafter referred to as Nz sound) is generated.
is thought to occur.

FIG. 6a is a frequency characteristic diagram of the Nz sound measured at the measurement points shown in FIG. 6b. From this figure, 572Hz (1st order) and 1144Hz (2nd order) = 572Hz
It can be seen that the Nz sound is generated in (1st order) x 2. Figure 7 shows the Nz sound radiation pattern based on the acoustic intensity vector diagram of the first-order and second-order Nz, Figure 7a is the first-order Nz sound radiation pattern diagram, and Figure 7b is the second-order Nz sound radiation pattern diagram. It is a sound radiation pattern diagram. Each of the horizontally extending bars in the figure is
It represents the direction and magnitude of the Nz sound being emitted.
From this figure, both the primary and secondary Nz sound
It can be seen that the radiation is particularly strongly radiated toward the front from slightly above the boundary between the drain pan 3 and the drain pan 3.

Therefore, the purpose of this invention is to provide an indoor unit for an air conditioner that can suppress Nz noise with a simple configuration.

<Means for Solving the Problems> In order to achieve the above object, this invention provides an air flow system having a cross flow fan 12, a heat exchanger 11, and a drain pan 13 arranged in parallel at the bottom of the heat exchanger 11. The indoor unit 10 of the harmonizer is equipped with sealing members 19 and 20 that seal the gap between the heat exchanger 11 and the drain pan 13 to suppress the generation of air blowing noise caused by the rotation of the cross flow fan 12. It is characterized by the fact that

<Operation> When the cross flow fan 12 rotates, indoor air is sucked and passes through the heat exchanger 11, and at this time, heat exchange is performed between the indoor air and the heat exchanger 11. Then, the air after heat exchange is sent out again into the room from the air outlet by the rotation of the cross flow fan 12.

At that time, the heat exchanger 11 and the drain pan 13
Since the gap between the cross-flow fan 12 and the cross-flow fan 12 is sealed by the seal members 19 and 20, air attempting to flow through the gap is blocked, and the speed difference in the air flow on the suction side with respect to the cross-flow fan 12 is eliminated. Therefore, generation of air blowing noise due to the rotation of the cross flow fan 12 is suppressed.

<Example> Hereinafter, this invention will be explained in detail with reference to illustrated examples.

In Fig. 1, 11 is the indoor unit 1 of the air conditioner.
This is a heat exchanger installed at 0 to exchange heat with the air drawn in from the room. 12 is a heat exchanger 11
This is a cross-flow fan that is arranged in parallel at the lower rear of the air conditioner and sends out the air that has passed through the heat exchanger 11 and been heat-exchanged into the room again. 13 is a drain pan that is arranged below the heat exchanger 11 to collect condensed water condensed by the heat exchanger 11, etc.; 15 is a flap that determines the blowing direction of the air sent out from the cross flow fan 12; It is.

The drain pan 13 has a substantially U-shaped cross section,
The bottom plate part 16 consists of an upper part 16a and a lower part 16b, and is inclined toward one end in the longitudinal direction, and the condensed water that has fallen into the drain pan 13 is collected at the one end and discharged to the outside. Further, the passage wall 14 is formed integrally with the drain pan 13, and the passage wall 14 and the casing 18 form an air outlet.

On the inner surface of the front plate portion 17 of the drain pan 13,
A first sealing member 19 is installed to seal the gap created between the front plate portion 17 and the lower front corner of the heat exchanger 11 in the longitudinal direction. The first seal member 19 is made of polyethylene foam and has a substantially rectangular prism shape. In addition, the bottom plate part 1
A second sealing member 20 is installed on the inner surface of the upper part 16a of the heat exchanger 6 to seal the gap created by the bottom plate part 16 and the lower surface of the heat exchanger 11 in the longitudinal direction. This second seal member 20 is made of foamed polyethylene and has a substantially square prism shape.

The condensed water flowing separately toward the one end of the upper stage part 16a and the lower stage part 16b of the bottom plate part 16 joins at this one end and is discharged to the outside.

FIG. 2 is a Nz sound frequency characteristic diagram when only the first seal member 19 shown in FIG. 1 is installed.
This figure shows that the primary (572Hz) Nz sound that appeared in the Nz sound frequency characteristic diagram of the conventional indoor unit in Figure 6a has disappeared. That is, FIG. 2 proves that the first seal member 19 prevents the generation of primary Nz sound. Moreover, FIG. 3 shows the case where only the second seal member 20 shown in FIG. 1 is installed.
It is a Nz sound frequency characteristic diagram. This figure shows that the Nz sound frequency characteristics of the conventional indoor unit, which appeared in Figure 6a,
It can be seen that the next (1144Hz) Nz sound has disappeared. That is, FIG. 3 proves that the second seal member 20 prevents the generation of secondary Nz sound.

FIG. 4 is a Nz sound frequency characteristic diagram when both the first and second seal members 19 and 20 are installed as shown in FIG. 1. This figure shows that the first seal member 19 prevents the primary Nz sound, and the second seal member 20 prevents the secondary Nz sound, so that both the primary Nz sound and the secondary Nz sound are eliminated. I can see that

FIG. 5 shows the first and second order Nz sound radiation patterns in the indoor unit in which the first and second seal members 19 and 20 are installed, and FIG. 5a is a diagram of the first order Nz sound radiation pattern, FIG. 5b is a diagram of the second-order Nz sound radiation pattern. From this figure, it can be seen that the magnitude of both the primary and secondary Nz sounds at each emission position is equalized and dispersed throughout. Furthermore, regarding the radiation direction of the Nz sound, in the conventional indoor units shown in Figures 6a and 6b, it is limited almost only to the front, but in the indoor unit of this invention, it is dispersed in various directions. I can see that In this way, according to this idea, the first
Figures 4 and 5 demonstrate that the generation of secondary Nz sounds is suppressed, and that it is effective in reducing Nz sounds.

That is, since the gap between the drain pan 13 and the heat exchanger 11 is sealed with the first seal member 19 or the second seal member 20, the airflow that attempts to flow through the gap is blocked and the cross flow fan 12 The speed difference between the air flow on the suction side and the air flow on the suction side disappears. Along with this, cross flow fan 1
The radiation of the Nz sound generated by the rotation of 2 is dispersed throughout and the level of the pure tone is lowered, so that the unpleasant abnormal noise is eliminated. Therefore, according to this invention, the Nz sound can be suppressed with a very simple configuration.

In the above embodiment, the first and second seal members 19,
20 is made of square prism foamed polyethylene, but this invention is not limited to this.
The shape and material of the sealing member may be other types.

In the above embodiment, the first seal member 19 and the second seal member 20 are used together, but only one of them may be installed. In addition, the first seal member 19
and the second seal member 20 may be integrally formed.

<Effects of the invention> As is clear from the above, this invention uses a sealing member to seal the gap between the heat exchanger and drain pan of an indoor unit of an air conditioner that has a cross flow fan, a heat exchanger, and a drain pan. So,
Air attempting to flow through this gap is blocked, and the Nz sound radiation generated by the rotation of the crossflow fan is dispersed throughout. Therefore, the generation of air blowing noise can be suppressed with a simple configuration.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the indoor unit of the air conditioner of this invention, Figure 2 is a Nz sound frequency characteristic diagram when only the first seal member is installed, and Figure 3 is a diagram when only the second seal member is installed. Nz sound frequency characteristic diagram, 4th
The figure shows Nz when the first and second seal members are used together.
Sound frequency characteristic diagram, Figure 5 is a diagram of the Nz sound radiation pattern when the first and second seal members are used together, Figure 6 is a diagram of the Nz sound frequency characteristic of the indoor unit of a conventional air conditioner, and Figure 7 is a diagram of the Nz sound radiation pattern when the first and second seal members are used together. FIG. 2 is a diagram showing an Nz sound radiation pattern of an indoor unit of a conventional air conditioner. 10... Indoor unit, 11... Heat exchanger, 12...
Cross flow fan, 13...Drain pan, 16
... Bottom plate part, 17 ... Front plate part, 18 ... Casing, 19 ... First seal member, 20 ... Second seal member.

Claims (1)

[Claims for Utility Model Registration] Cross flow fan 12, heat exchanger 11,
An indoor unit 10 of an air conditioner having a drain pan 13 arranged in parallel below the heat exchanger 11, the indoor unit 10 having seal members 19 and 20 for sealing a gap between the heat exchanger 11 and the drain pan 13. hand,
An indoor unit of an air conditioner characterized in that the generation of air blowing noise caused by the rotation of the cross flow fan 12 is suppressed.