JPH05164392A - Distributing device for expanded rectangular duct - Google Patents

Abstract

PURPOSE:To reduce the deviation of airstream by a method wherein the sectional configuration of an expanded part is expanded gradually and a guide plate is arranged on the diagonal line of the inside of the expanded part. CONSTITUTION:Air, conducted through the inside of a part 1 having a small sectional area, enters a part 2 having a large sectional area through four compartments of an expanded part 4 and flows through a filter 4. In this case, the sectional area of the expanded part 3 is increased gradually and a guide plate 5 is provided on the diagonal line of the expanded part 3 whereby the flow of air is unified by the guide plate 5 and air speed distributions in respective points of the section of the expanded part 3 are unified substantially. According to this method, the deviation of airstream can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rectifying an enlarged angle duct.

[0002]

2. Description of the Related Art For example, in air supply systems of air conditioning equipment, air conditioners, ventilation systems, etc., square ducts having a quadrangular cross section are used to mount cooling heating coils and filters of heat exchangers. In some cases, an enlarged angle duct whose cross-sectional area increases in the gas flow direction at the enlarged portion is used.

In the enlarged portion of the enlarged angle duct as described above, the turbulence of the air flow causes a non-uniform flow of the air flow after the expansion, which causes a non-uniform flow of the air flow passing through the coil, the filter, and the like, and this non-uniformity also fluctuates. Such variations in wind speed
Due to the arrangement of the ducts, it becomes more noticeable when a blower or a curved duct is provided close to the upstream side of the enlarged portion.
Due to such uneven distribution of the passing air flow, problems such as insufficient heat exchange, coil freezing, and partial filter clogging occur.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide a straightening device for an enlarged angle duct that can reduce the deviation of the airflow after the enlargement.

[0005]

In the rectifying device for an enlarged angle duct according to the present invention, in the enlarged angle duct having a quadrangular cross section and the cross-sectional area increases in the direction of gas flow in the enlarged section, the sectional shape of the enlarged section is temporary. It is enlarged, and a guide plate is arranged on a diagonal line inside the enlarged portion.

[0006]

[Function] Since the cross-sectional shape of the enlarged portion is enlarged for a while and the guide plate is located on the diagonal line inside the enlarged portion, the distribution of the wind speed at each point of the cross-section of the enlarged portion becomes substantially uniform, and the deviation of the air flow Get smaller.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a part of an enlarged angle duct having a substantially square cross section and its rectifying device, and FIG. 2 shows a cross section thereof. This duct has a small cross section (1)
And a large cross section (2) with a large cross section and an enlarged section (3) between them. The gas is flowing. Further, a filter (4) and the like are provided in the large cross-section area (2) near the enlarged portion (3).

The enlarged portion (3) is formed so that the cross-sectional area increases for a while. In this example, the four side walls (3a) of the enlarged portion (3) are formed flat and are arranged so as to spread toward the large cross-sectional area portion (2). Is enlarged linearly. And the expansion section (3)
The guide plate (5) is arranged in an X-shaped cross section on the two diagonal lines inside, that is, on the two surfaces that connect the substantially square diagonal lines of each cross section. It is divided into two parts.

The air flowing in the small cross-section area (1) enters the large cross-section area (2) through the four sections of the expansion section (3),
It flows through the filter (4). At this time, the cross-sectional area of the enlarged portion (3) increases for a while, and since the guide plate (5) is provided on the diagonal line of the enlarged portion (3), air is rectified by this and the enlarged portion (3 The distribution of the wind speed at each point on the cross section of () becomes almost uniform, and the deviation of the air flow is reduced.

The side wall (3a) of the enlarged portion (3) is a small cross-sectional area portion.
The angle θ with the side wall (1a) of (1) was set to 15 degrees, and an experiment was conducted by flowing air.
It was confirmed that the deviation of the air flow in (2) was extremely small. In addition, the side wall (3a) of the enlarged portion (3) has a small cross-section area (1).
Guide plate even if the angle between it and the side wall (1a) is about 15 degrees
It was also confirmed that the air flow would be biased without (5).
Further, instead of the guide plate (5) of the above embodiment, an enlarged portion
(3) Figure 2 on two planes parallel to the side wall (1a) of the small cross section
A guide plate with a cross-shaped cross section as shown by the chain line (A)
When an experiment similar to the above was carried out, the bias of the air flow was smaller than that without the guide plate, but the bias of the air flow was greater than that of the above embodiment, and the enlarged portion (3) as in the above embodiment was used. It was confirmed that the rectifying effect was higher when the guide plate (5) was installed on the diagonal line.

[0012]

As described above, according to the rectifying device for an enlarged angle duct of the present invention, it is possible to reduce the deviation of the airflow after the expansion, and therefore the heat exchange due to the deviation of the passing airflow is insufficient, and It becomes possible to prevent problems such as freezing and partial clogging of the filter.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an enlarged angle duct and a rectifying device therefor according to an embodiment of the present invention.

2 is a cross-sectional view of FIG.

[Explanation of symbols]

 (3) Enlargement section (5) Guide plate

Claims (1)

[Claims] 1. In an enlarged angle duct having a quadrangular cross section and an increased cross-sectional area in the direction of gas flow in the enlarged portion, the cross-sectional shape of the enlarged portion is enlarged for a while, and is located on a diagonal line inside the enlarged portion. A rectifying device for an enlarged angle duct, characterized in that a guide plate is arranged.