JP3066149B2 - Heat exchange unit - Google Patents

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 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-mentioned object, the present invention provides a centrifugal fan in a ventilation passage of a unit body, and a substantially square heat exchanger arranged so as to surround the centrifugal fan. In the heat exchange unit, wherein the air discharged from the centrifugal fan is guided to the heat exchanger by the rotation of the centrifugal fan, on the suction side of any linear shape portion of the heat exchanger, the corresponding linear shape portion a control plate extending into one of the centrifugal fan side for providing, beside of the control plate
The control plate provided on the straight section
The center of the centrifugal fan that bisects the linear part
It is characterized by being arranged with different amounts .

[0007]

According to the present invention, the room air sucked from the central portion via the centrifugal fan flows out of the suction side of the heat exchanger to the discharge side while flowing in the ventilation path so as to get over the control plate. In this case, since the control plate has an appropriate resistance to the flow of air, the pressure in the space between the control plates is made uniform, and therefore, the generation of eddy currents in the space, particularly heat, Since the generation of eddies at the corners of the exchanger is suppressed, the generation of noise from the unit is suppressed.

[0008]

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.

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. 2, control plates 21 extending inward, that is, extending to the centrifugal fan 5 side, are attached to the linear portions 9a on the suction side of the heat exchanger 9, respectively.

As shown in FIG. 3, the control plate 21 includes:
A fork-shaped holder 23 is provided, and the control plate 21 is attached to the suction side of the heat exchanger 9 by fitting the holder 23 into the tube 9 b of the heat exchanger 9. Further, the control plate 21 is curved in the short side direction, and is arranged such that the convex side 21a is located upstream with respect to the flow of air in the ventilation path 7.

In the heat exchange unit configured as described above, the room air sucked from the central portion via the centrifugal fan 5 is made to pass over the convex side 21a of the control plate 21, as is apparent from FIG. Then, it flows from the suction side to the discharge side of the heat exchanger 9 while flowing in the direction of the arrow. At this time, since the control plate 21 has an appropriate resistance to the flow of air, the pressure in the spaces A to D between the control plates 21 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.

The control plate 21 is provided with a corresponding linear portion 9a.
And one straight portion 9 of the heat exchanger 9.
They are mounted at positions slightly deviated from the center of "a", such that their intervals are not equal.
In the illustrated example, the control plate 21 at the end of the space A is a heat exchanger.
9 is mounted on the center line 11 of the centrifugal fan 5 which divides the linear portion 9a into two substantially equal parts.
Is mounted at a position separated by α from the center line l2 , which also bisects the linear portion 9a of the heat exchanger 9, and the control plate 21 at the end of the space C is located at β from the center line l1. Control plate 21 at the end of the space D
Is mounted at a position separated by γ from the center line l2 (however, the deviation amount is α>γ> β). This control
The plate 21 does not need to be attached to all the linear portions 9a.
For example, the control plate 21 at the left end in FIG.
Control plates 21 are attached at positions separated by α, γ, and β, respectively.
It may be. In addition, all the deviation amounts of these control plates 21
Even if they are not arranged differently, for example, the shift amount α = γ
Then, the deviation amount α and the deviation amount β may be made different from each other.
Good.

FIGS. 4 to 6 show measured noise values. FIG. 4 shows a case where the control plates 21 are mounted at intervals as shown in FIG. 1, ie, unequal intervals, and FIG.
6 shows the measured values when the control plate 21 was not mounted. When compared with the case of FIG. 6, it was found that the noise of the component a of 1.6 to 2.5 KHz was greatly attenuated in the case of FIG. Also, in the case of FIG. 5, it was found that the noise of the component a of 1.6 to 2.5 KHz attenuated, but the noise around the component b of 70 Hz turned to increase. According to the measurement results, it is desirable that the control plates 21 be mounted at unequal intervals.

As is apparent from these, according to the present embodiment, the control plate 21 extending toward the centrifugal fan 5 is attached to the suction side of the linear portion 9a of the heat exchanger 9, so that the suction No vortex is generated in the side corner 9c,
The effect that 1.6-2.5 KHz component noise can be greatly attenuated is obtained.

Hereinafter, the present invention has been described based on one embodiment, but 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.

[0019]

As is apparent from the foregoing description, according to the present invention, the suction side of any linear portion of the heat exchanger, the
A control plate extending toward one centrifugal fan is provided for the corresponding linear shape portion, and an adjacent linear shape portion of the control plate is
The provided control plate is roughly bisected by the linear part of the heat exchanger.
To the center line of the centrifugal fan
As a result , the control plate has an appropriate resistance and suppresses the generation of a vortex on the suction side of the heat exchanger, thereby suppressing the generation of noise from the unit.

[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 3 Ceiling 5 Centrifugal fan 7 Ventilation path 9 Heat exchanger 15 Air outlet 21 Control board

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukio Aizawa 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takeshi Ogawa 2--18-3 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-60-30921 (JP, A) JP-A-5-3816 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 1 / 00 306 F24F 1/00 391 F24F 1/00 401

Claims (1)

(57) [Claims] 1. A centrifugal fan is provided in a ventilation path of a unit main body, and a substantially rectangular heat exchanger is disposed so as to surround the centrifugal fan, and is discharged from the centrifugal fan by rotation of the centrifugal fan. In a heat exchange unit adapted to guide air to the heat exchanger, any of the heat exchangers
On the suction side of the linear part of
A control plate extending toward one of the centrifugal fans is provided .
The control plate provided on the adjacent linear part of the control plate
The center of a centrifugal fan that bisects the straight section of the heat exchanger
A heat exchange unit , wherein the displacement amount is different from the line .