JPH11325497A - Heat exchanging unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attenuate noise of a heat exchanging unit by damming the air delivered from a centrifugal fan with a control plate having a smooth curved surface and introducing the air to each heat exchanger through Coanda effect thereby feeding the delivered air smoothly to the heat exchanger. SOLUTION: A control plate 211 is fixed only to the vicinity of minimum gap between a centrifugal fan 5 and the linear section 9a of a heat exchanger 9 on the suction side thereof. The control plate 211 has a smooth curved surface including a primary side face 21a for damming the air delivered from the centrifugal fan 5, and a secondary side face 21b for introducing the air to the heat exchanger 9 through Coanda effect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange unit that suppresses generation of noise.

[0002]

2. Description of the Related Art In general, there is known a heat exchange unit including a centrifugal fan in a ventilation passage of a unit body and a substantially square heat exchanger disposed so as to surround the centrifugal fan (for example, a heat exchange unit). And JP-B-63-19779).

In this type, a unit main body is buried in a ceiling, a ventilation panel is mounted thereon, and room air is sucked from a central opening of the ventilation panel, and indoor air is drawn from the entire peripheral side of the panel. It is formed so that conditioned air is sucked out.

[0004]

However, in the conventional configuration, the room air sucked through the centrifugal fan is
When the heat exchanger goes around the four corners on the suction side of the substantially square heat exchanger, a vortex is generated there, which causes a problem that high noise is generated.

Accordingly, an object of the present invention is to provide a heat exchange unit which solves the above-mentioned problems of the prior art and can suppress generation of high noise.

[0006]

In order to achieve the above object, the present invention provides a centrifugal fan in a ventilation passage of a unit main body, and a substantially square shape having four linear portions arranged so as to surround the centrifugal fan. A heat exchanger having a shape such that air discharged from the centrifugal fan is guided to the heat exchanger, and the suction side of the heat exchanger has a vicinity of a minimum gap between the centrifugal fan and a linear portion of the heat exchanger. And a control plate having a smooth curved surface whose primary side is to block the air discharged from the centrifugal fan and whose secondary side is guided to the heat exchanger by the Coanda effect, respectively.

According to the present invention, the room air sucked from the center through the centrifugal fan flows through the ventilation passage,
It flows out from the suction side of the heat exchanger to the discharge side. At this time, the control plate located only near the minimum gap between the centrifugal fan and the linear portion of the heat exchanger regulates the flow of air.

[0008] That is, the primary side of the control plate dams the air discharged from the centrifugal fan by the smooth curved shape of the control plate, and the secondary side is guided to the heat exchanger by the Coanda effect, respectively, and is discharged from the centrifugal fan. Since the air flows smoothly into the heat exchanger, the generation of noise from the unit is suppressed.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a state where the ventilation panel of the heat exchange unit is removed. In FIG. 1, reference numeral 1 denotes a unit main body, and the unit main body 1 is buried in a ceiling 3. A centrifugal fan 5 is rotatably provided at the center of the unit body 1, and a ventilation path 7 is formed around the centrifugal fan 5. A heat exchanger 9 formed in a substantially square shape is disposed in the ventilation path 7 so as to surround the centrifugal fan 5. In addition, 11 is an exterior board, 13 is a drain pump.

Here, the relationship between the unit body 1, the heat exchanger 9 and the centrifugal fan 5 will be described in more detail as follows.

The heat exchanger 9 is annularly disposed around the centrifugal fan 5 and is constituted by a series of plate-fin type heat exchangers comprising four straight portions 9a and three corners (corners) 9c. The connecting plate 41 is arranged substantially linearly at the remaining open corners (corners) 40 of the heat exchanger. This joint plate 41 has both ends attached to the heat exchanger 9. As described above, the heat exchange unit includes the heat exchanger 9 having an annular part formed by the joint plate 41.

FIG. 2 is a sectional view showing a part of the unit body 1. Due to the rotation of the centrifugal fan 5, as indicated by the arrow 14, the room air flowing from the center of the unit body 1 and being sucked into the suction port of the centrifugal fan 5 is
Is discharged from the suction side of the heat exchanger 9 to the discharge side, and is heat-exchanged in the heat exchanger 9 before being converted into conditioned air and blown out from the outlet 15 of the unit body 1.
In addition, 17 is a drain pan made of styrene foam, and 19 is a fan motor.

According to this embodiment, FIGS. 1 and 2
As is clear from FIG.
In a, straightening plates (hereinafter, referred to as “control plates”) 211, 212, and 21 extending inward, that is, extending to the centrifugal fan 5 side.
3, 214 are attached respectively.

Here, these control plates 211, 212, 2
The details of the relationship between the heat exchanger 9 and the heat exchangers 13 and 214 are as follows. A control plate 211 is provided downstream of and near the joint plate 41 to rectify the flow of wind. Also,
From another point of view, the control plate 211 is adjacent to the joint plate 41, and the center line 10 of the centrifugal fan 5 is orthogonal to the straight portion 9a in the straight portion 9a of the heat exchanger 9 downstream of the plate.
It is located on the leeward side of 0.

These control plates 211, 212, 213,
As shown in FIG. 3, a fork-shaped holder 2
The control plates 211 to 214 are mounted on the suction side of the heat exchanger 9 by fitting the holder 23 into the tube 9 b of the heat exchanger 9. These control plates 211 to 214 are curved in the lateral direction, and
The inside air flow has a smooth curved surface shape such that the primary side surface 21a is located on the upstream side and the secondary side surface 21b is located on the downstream side.

In the heat exchange unit configured as described above, the room air sucked from the central portion through the centrifugal fan 5 controls the control plates 211 to 2 as is clear from FIG.
14 is stopped so as to get over the primary side surface 21a, and flows out from the suction side to the discharge side of the heat exchanger 9 while flowing in the direction of the arrow. Further, it is considered that the heat flows out from the suction side to the discharge side of the heat exchanger 9 due to the Coanda effect along the secondary side 21b of the control plates 211 to 214.

At this time, since the control plates 211 to 214 have an appropriate resistance to the flow of air, the control plates 211 to 21 1
The pressure in the spaces A to D between the four is equalized. Accordingly, the generation of eddies in the spaces A to D, particularly the generation of eddies in the corners 9c of the heat exchanger 9, is suppressed, and the noise generated from the unit is greatly attenuated.

Further, when attention is paid to the entire flow of air in the heat exchange unit, the following can be considered. The room air sucked from the center through the centrifugal fan 5 flows out of the heat exchanger 9 from the suction side to the discharge side while flowing through the ventilation path 7. At this time, these control plates 211, 212, 213,
The 214 regulates the flow of air, and the air discharged from the centrifugal fan smoothly flows into a series of heat exchangers, each of which has a ring-shaped part formed of a joint plate. Can be That is, these control plates function as so-called rectifying plates. .

The control plates 211 to 214 are mounted at positions slightly shifted from the center of the linear portion 9a of the heat exchanger 9 so that their intervals are not equal. In the illustrated example, the control plate 214 at the end of the space A
Is mounted on the center line 100 of the centrifugal fan 5, the control plate 211 at the end of the space B is mounted at a position away from the center line 100 by α, and the control plate 21 at the end of the space C is
2 is attached at a position β away from the center line 100, and the control plate 213 at the end of the space D is
It is attached at a position separated by γ from 0 (however, α>γ> β).

FIGS. 4 to 6 show noise measurement values. 4 shows the case where the control plates 211 to 214 are mounted at intervals as shown in FIG. 1, that is, unequal intervals, FIG. 5 shows the case where the control plates are mounted at equal intervals, and FIG. 6 shows the case where the control plates are not mounted. Shows the measured values. In comparison with the case of FIG. 6, the case of FIG.
It was found that the noise was greatly attenuated. FIG.
In the case of (1), the noise of the component a of 1.6 to 2.5 KHz is attenuated (however, it was found that the noise around the component b of 70 Hz turned to increase).

From these facts, in particular, the smooth side surface of the control plate located only near the minimum gap between the centrifugal fan and the linear portion of the heat exchanger causes the primary side to dam the air discharged from the centrifugal fan. In addition, it is considered that the secondary sides are guided to the heat exchangers by the Coanda effect, and the air discharged from the centrifugal fan flows into the heat exchangers smoothly, so that generation of noise from the unit is suppressed.

Although the present invention has been described based on one embodiment, it is apparent that the present invention is not limited to this.

For example, the shape of the control plate 21 is not limited to that shown in FIG. 3, but can be changed to various shapes as shown in FIGS. In FIG. 7, A is an example in which the main body of the control plate 21 is rectangular, B is an example in which the main body is meshed, C is an example in which the main body is hollow, and D is a mesh in which both the main body and the holder are meshed. It is an example. In FIG. 8, E is an example in which the main body of the control plate 21 is made thinner, F is an example in which the width W of the main body is reduced, and G is
Is an example in which the width W of the main body is increased. The control plate may have a round cross section.

[0025]

As is apparent from the above description, according to the present invention, the primary side surface is formed by the smooth curved surface shape of the control plate located only near the minimum gap between the centrifugal fan and the linear portion of the heat exchanger. The air discharged from this centrifugal fan is blocked and the secondary side is guided to this heat exchanger by the Coanda effect, and the air discharged from the centrifugal fan flows into the heat exchanger smoothly, generating noise from the unit. Can be kept low.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a heat exchange unit according to the present invention.

FIG. 2 is a sectional view showing a main part of the present invention.

FIG. 3 is a perspective view showing a control plate.

FIG. 4 is a diagram showing measured values of noise.

FIG. 5 is a diagram showing measured values of noise.

FIG. 6 is a diagram showing measured values of noise.

FIGS. 7A to 7D are front views showing other examples of the control plate.

8A to 8G are front views showing other examples of the control plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit main body 5 Centrifugal fan 7 Ventilation path 9 Heat exchanger 9a Linear part 211 Control board (rectifier plate) 21a Primary side 21b Secondary side 40 Corner part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Aizawa 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takeshi Takeshi 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Machine Co., Ltd.

Claims (1)

[Claims] 1. A centrifugal fan is provided in a ventilation path of a unit main body, and a substantially square-shaped heat exchanger having four linear portions is provided so as to surround the centrifugal fan, and is discharged from the centrifugal fan. In a heat exchange unit in which air is guided to the heat exchanger, and a control plate is attached to a suction side of the heat exchanger, the control plate is located near a minimum gap between the centrifugal fan and a linear portion of the heat exchanger. And a secondary side surface having a smooth curved surface shape for blocking air discharged from the centrifugal fan and guiding secondary side surfaces to the heat exchanger by the Coanda effect, respectively. .