JP3213594B2 - 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 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]

Means for Solving the Problems A centrifugal fan is provided in a ventilation path of the unit body, and a substantially square heat exchanger having four linear portions and disposed around the centrifugal fan. In a heat exchange unit in which the discharged 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 a minimum of a centrifugal fan and a straight portion of the heat exchanger. The primary side face is located near the gap and the air discharged from the centrifugal fan is blocked and the air flows out of the primary side face in the flow direction of the air discharged from the centrifugal fan.

According to the present invention, the room air sucked from the central portion through the centrifugal fan flows while flowing 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 straight section of the heat exchanger regulates the flow of air.

That is, the control plate is located near the minimum gap between the centrifugal fan and the linear portion of the heat exchanger, and the primary side of the control plate intercepts the air discharged from the centrifugal fan and rides over the primary side to cause the centrifugal fan to move therefrom. Since the discharged air is caused to flow in the flow direction, the air discharged from the centrifugal fan smoothly flows into the heat exchanger, and 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 toward 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. That is, the primary side surface of the control plate blocks the air discharged from the centrifugal fan and flows over the primary side surface in the flow direction of the air discharged from the centrifugal fan.

At this time, the control plates 211 to 214 have an appropriate resistance to the flow of the air.
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 control plate located only in the vicinity of the minimum gap between the centrifugal fan and the straight section of the heat exchanger has the straight section between the centrifugal fan and the heat exchanger. And the primary side of the unit blocks the air discharged from the centrifugal fan and flows over the primary side in the direction of flow of the air discharged from the centrifugal fan. Generation of noise can be suppressed 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 Straight part 211 Control plate (rectifier plate) 21a Primary side 21b Secondary side 40 Corner part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukio Aizawa 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takeshi Ogawa 2--18-18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-60-30921 (JP, A) JP-A-9-49640 (JP, A) JP-A-9-133374 (JP, A) JP-A-9-236276 (JP, A) , A) Japanese Utility Model Hei 4-43729 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 1/00 306 F24F 1/00 401 F24F 1/00 391

Claims (1)

(57) [Claims] 1. A centrifugal fan in a ventilation passage of a unit body,
A substantially square heat exchanger having four linear portions disposed so as to surround the centrifugal fan, and guiding the air discharged from the centrifugal fan to the heat exchanger. A heat exchange unit in which a control plate is mounted on the suction side of the heat exchanger, wherein the control plate is located near the minimum gap between the centrifugal fan and the linear portion of the heat exchanger and has a primary side.
Surface blocks the air discharged from this centrifugal fan.
The air discharged from the centrifugal fan over the primary side
A heat exchange unit characterized by flowing in the flow direction .