JPH01300129A - Interior unit device for air conditioner - Google Patents

Abstract

PURPOSE:To obtain a noise-reducing effect and contrive a smaller overall device size by providing an air duct between a partition plate, which is disposed in a cabinet so mounted that a blowing port and a blow-off port of a fan casing are connected to each other, and a heat exchanger. CONSTITUTION:A fan casing 21 with a fan 2 contained therein is mounted on a partition plate 3, and is contained in a cabinet 1 in that condition. The partition plate 3 is provided with a blowing port 31 for passing therethrough an air flow from the fan 2. An air duct 5 is provided between the partition plate 3 and a heat exchanger 4 in such a shape that the opening area thereof is increased toward the outer side and generation of Karman's vortex is suppressed, whereby the air flow through the blowing port 31 is supplied through the duct 5 to the heat exchanger 4. The duct 5 is so designed that protrusion lengths A and B at upper and lower parts of the blowing port are in the ratio of about 3:1, the angle C toward the lower side is about 30 deg., and the opening angle D in the widthwise direction of the blowing port is about 20 deg., whereby it is possible to reduce noise and contrive an overall compact construction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement of an indoor unit device for an air conditioner that includes a fan and a heat exchanger.

(Prior Art) A conventional air conditioner indoor unit device consisting of, for example, a centrifugal multi-blade fan driven by the rotational force of a motor and a heat exchanger that receives air from the fan is shown in FIG. There is something.

That is, FIG. 5 shows a cross-sectional view of an indoor unit device of a so-called built-in type air conditioner, in which a box-shaped cabinet (1) contains a fan casing (21) housing a fan (2), and a partition. A plate (3) is attached. The partition plate (3) is provided with an air outlet (31) so as to be continuous with the air outlet of the fan casing (21). A heat exchanger (4) that receives air from the fan (2) is provided on the other side of the partition plate (3).

The conventional indoor unit device described above has a configuration in which the heat exchanger (4) receives air from the fan (2) directly from the air outlet (31), but the air outlet (31) is relatively narrow and suddenly widens. Since the air blow spreads into the heat exchanger (4) chamber, a so-called Karman vortex is generated.

Due to the location of use of indoor unit devices, it has always been a challenge to reduce noise, and the generation of aerodynamic noise due to Karman vortices has been a major cause of noise generation and has been a problem. To reduce the Karman vortex, a fan (2
) It is conceivable to extend the casing (21) on the side of the air outlet and provide a duct portion that projects forward through the so-called air outlet (31).

However, extending the fan casing and providing a duct section increases the size of the fan casing.
Installation in a compact cabinet becomes difficult. In other words, it was not easy to assemble the fan unless the cabinet was made larger.

(Problems to be Solved by the Invention) Conventional indoor unit devices for air conditioners generate a lot of noise due to aerodynamic noise, and extending the fan casing to solve this problem worsens the workability of attaching and detaching the fan. There was a drawback.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an indoor unit device for an air conditioner in which the fan can be easily attached and detached while reducing noise.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an air conditioner in which a fan driven by the rotational force of a motor and a heat exchanger receiving air from the fan are housed in a cabinet. In the indoor unit device, an air outlet is provided, a partition plate is installed so that the air outlet and the air outlet of the fan casing are connected, and is housed in the cabinet, and a partition plate that is housed in the cabinet. The present invention is characterized in that it utilizes a ventilation duct provided between the partition plate and the heat exchanger.

(Function) In the indoor unit device for an air conditioner according to the present invention, the air duct is installed between the heat exchanger and the partition plate, and the fan casing is separated from the air duct and inserted into the cabinet, so that noise is reduced. At the same time, the fan and fan casing can be easily attached to and removed from the cabinet.

(Example) Hereinafter, an embodiment of an indoor unit device for an air conditioner according to the present invention will be described in detail with reference to the drawings.6 Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the device of the present invention.

In Figure 1, the box-shaped cabinet (1) has a slight radius.
A heat insulating material (1
2) (13), and inside this cabinet (1), for example, a centrifugal multi-blade fan (2), a fan casing (21) housing this fan, and a heat exchanger (4) are installed. It will be stored. The iron plate (11) is molded by metal forming, and has an integral structure with no joints between the two side walls at the R. As a result, the insulation material can be attached as a single piece without any seams, which not only simplifies assembly and manufacturing, but also prevents the insulation material from peeling off from the joints or reducing the insulation effect, and prevents condensation. will improve further.

The fan casing (21) is attached to the partition plate (3) while housing the fan (2), and is attached to the cabinet (1).
It is installed for storage. Fan (2) on partition plate (3)
It is provided with an air outlet (31) through which air is blown from.

Between the partition plate (3) and the heat exchanger (4),
As shown in the details in Figure 2, the opening surface is expanded outward,
A blower duct (5) having a shape that further reduces the generation of Karman vortices is installed, and the air from the air outlet (31) passes through this duct (5) and is supplied to the heat exchanger (4). It is configured like this.

As shown in the side view in FIG. 2(a), the air duct (5) has an overhanging length (A
) and (B) was about 3:1, and the downward opening angle (C) was about 30 degrees. Also, the second
As shown in the top view in Figure (b), the width direction of the air outlet, that is, the opening angle (D) of the side plate was approximately 20 degrees. In addition, Figure 2 (
C) is a front view of the ventilation duct (5).

Therefore, we varied the ratio of the length of the upper and lower overhangs of the ventilation duct (5) and compared them with the conventional case without a duct, and measured the level of noise generated. As a result, the measured values shown in Figure 3 were obtained. Ta. As is clear from FIG. 3, it was found that when the ratio of overhang lengths (^):(B) was 3:1, the noise caused by air blowing reached its lowest value. Overhang length ratio (A)
: If (B) is 3.1, this indicates that the noise level deteriorates by 2 dB or more in a conventional device without a blower duct.

Note that the ventilation duct (5) is directly connected to the cabinet (1).
However, if there is a gap between the partition plate (3) and the partition plate (3), leakage can be prevented using a sealing material or the like.

As described above, the device of this invention reduces the noise generated, and as a result of the fan casing (21) having a structure without an extension duct, the entire device is made more compact, and it is easier to install it to the cabinet (1). That's how smoothly it can be done.

The device shown in FIG. 1 has one fan (2) and is driven by a motor (not shown), but it is also possible to use one motor to drive two centrifugal multi-blade fans. It can also be done.

That is, FIG. 4 is a plan sectional view showing the third embodiment of the device of this invention.

In FIG. 4, components that are the same as those shown in FIG. A pair of fans (2) is installed, and the air from these is supplied to one heat exchanger (4) via the air outlet (31) of the common partition plate (3) and the air duct (5). It is configured like this.

At this time, the positions of the adjacent air ducts (5) are set so that the points (E) where the side plates intersect in the extending direction are located in front of the heat exchanger (4) as shown in the figure. is the most effective.

Furthermore, although each of the above embodiments shows an indoor unit device that is embedded in the ceiling, the present invention is of course not limited to this. Furthermore, it goes without saying that the fan is not limited to a centrifugal multi-blade fan.

As described above, in the indoor unit device for an air conditioner according to the present invention, since the blower duct (5) is provided separately from the partition plate (3) and the fan casing (21), it is easy to attach and detach the fan, and there are no maintenance points. This is convenient for inspection, and the overall shape of the unit device can be made smaller.

[Effects of the Invention] As described above, the indoor unit device for an air conditioner according to the present invention has practical advantages such as not only the noise reduction effect can be obtained, but also the fan casing can be easily installed and removed, and the entire device can be made smaller. It's very effective.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of an indoor unit 1 to a device of an air conditioner according to the present invention, and FIG. 2 (a) (bHC)
1 shows a side view, a top view, and a front view of the ventilation duct of the device shown in FIG. 1. FIG. FIG. 4 is a plan view showing another embodiment of the device of the present invention, and FIG. 5 shows a conventional indoor unit device of an air conditioner! FIG. (1)...Cabinet (2)...Fan (21)...Fan casing (3)...Partition plate (4)...Heat exchanger (5)...Blower duct agent Patent attorney Shidai Ko Norio Figure 1 (cL) (C) Figure 2 Figure 3 @ Figure 4 Figure 5

Claims (1)

[Claims] In an indoor unit device of an air conditioner in which a fan driven by the rotational force of a motor and a heat exchanger receiving air from the fan are housed in a cabinet,
A partition plate provided with an air outlet and installed in such a way that the air outlet and the air outlet of the fan casing are connected and housed in the cabinet, and a partition plate housed in the cabinet and the heat exchanger. An indoor unit device for an air conditioner, characterized by comprising a ventilation duct provided between the air conditioners.