JPH0139021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a duct outlet for blowing out conditioned air indoors from an air duct installed in a building. To provide a variable airflow outlet for a duct, which automatically changes the direction and speed of the airflow in response to the change in air flow.

Various air outlets that automatically change the blowing direction have been proposed, but most of them are for air conditioners, and they may not be directly applicable to duct outlets. many. This is because when a large number of independent air outlets are installed in a duct installed in a building, if a direction variable means driven by other power is employed, construction and maintenance thereof will be difficult.

The present invention proposes a new, simple and easy-to-install mechanism that allows a large number of air outlets arranged in a ventilation duct system to function as variable airflow outlets. This provides an outlet that allows the wind speed to be changed. That is, the present invention is a variable airflow outlet for a duct that is connected to an air duct installed in a building and changes the blowout direction according to changes in the total pressure of air inside the duct, and which A long and narrow orifice hole with an opening surface is formed in the casing, and two guides are attached so that the long side edges of the orifice hole widen toward the indoor side. A core member having outer edges parallel to the side edges on both sides is attached to the center of the orifice hole, and a slit-shaped opening is formed between the long side edge of the orifice hole and the outer edge of the core member. The indoor side surface of the core member is formed to be tapered from both outer edges of the core member toward the indoor side, and the relative height of the outer edge of the core member with respect to the long side edge of the orifice hole is The core member itself is installed in the orifice hole via a spring so as to be displaced by wind pressure, and due to the change in the inclination of the slit-shaped opening surface due to this wind pressure, it is biased toward the guide side when the wind pressure is high. Airflow occurs,
It is characterized in that when the wind pressure is low, an airflow is generated that is biased toward the tapered surface of the core member. In this case, the tapered surface on the indoor side of the core member should preferably have a V-shaped cross section, and the tapered tip should connect both sides of the core member in a rotatable manner so that the tapered angle can be changed by wind pressure. .

Examples of the drawings will be described below. Fig. 1 is a schematic cross-sectional view of a box-shaped duct outlet according to the present invention, and Fig. 2 is a perspective view thereof. fixing plate 2,
2' with a downward slope from both sides,
Guides 3, 3' are installed below the fixing plates 2, 2' so as to widen towards the indoor side.
The free edges of the fixing plates 2, 2' and the guides 3, 3' are not connected to each other, but are spaced apart from each other with a slight gap. Then, an elongated core member 4 having a V-shaped cross section is suspended via a spring 5 at the center of the elongated orifice hole thus formed. In the illustrated example, the core member 4 is a rectangular plate bent so as to have a V-shaped cross section, and folded pieces 6, 6' are provided on both edges thereof. Further, in the illustrated example, the tapered surface having a V-shaped cross section is rotatable at its tip, and its opening angle changes depending on the wind pressure. By hanging this core member 4 at the center of the orifice hole, the folded pieces 6, 6' and the fixing plate 2,
2', two mutually symmetrical elongated slit-shaped openings are formed. When the total pressure of the air blowing system fluctuates, this core member 4 moves up and down against the elasticity of the spring 5 in response to the change, and its folded pieces 6 and 6' open and close. , 6' and the fixing plates 2, 2'. In other words, the slit-shaped opening surface formed between the folded pieces 6, 6' of the core member 4 and the fixed plates 2, 2', with respect to the opening surface of the orifice hole whose position is fixed, changes depending on the wind pressure. It will be tilted and its opening area will also change. Due to this change in the shape of the slit hole, the direction of the blown airflow changes as shown by the arrow in the figure.

That is, when the wind pressure (total pressure) inside the duct is low, the extent to which the core member 4 descends against the elasticity of the spring 5 is small, so the core member 4 is in a state as shown by the solid line, and the folded pieces 6, 6' Since the height of the outer edge of the core member is relatively high, the slit-shaped opening faces slightly toward the tapered surface of the core member, and a Coanda effect occurs between the tapered surface and the airflow. It flows like a solid line. As the total pressure gradually increases, the core member 4 is displaced to the position indicated by the dotted line, and the height of the outer edges of the folded pieces 6, 6' gradually decreases, and between the tapered surfaces of the core member 4 that were previously formed. The Coanda effect collapses as the mutual positional relationship becomes mismatched, and the airflow separates from this tapered surface and flows as shown by the dashed line. When the total pressure further increases, the core member 4 is further displaced to the position shown by the dotted line, and the Coanda effect occurs between the guides 3 and 3', resulting in a blowing airflow with a larger blowing angle as shown by the dotted line.

In addition, in the example, the fixed plates 2, 2' and the guide 3,
Although an example is shown in which a slight gap is provided at the free end edge of the guide 3', this gap is not necessarily necessary, and in principle, the fixing plate 2, 2' itself can also be omitted and the upper edge of the guide 3, 3' An elongated orifice hole may be provided. However, if the fixing plates 2, 2' are mounted with an inclination toward the orifice hole as shown in the figure, the airflow inside the casing can be stably guided to the orifice hole provided in the center of the casing. In addition, although an example has been shown in which both side edges of the core member 4 are formed by folded pieces 6, 6', these folded pieces 6, 6' are not necessarily necessary, and the opening area of the orifice hole is fixed. Inside, a slit-like pore is formed in which the relative height of the outer edge of the core member to the fixed edge on the long side of the orifice hole changes depending on wind pressure (a pore whose shape changes depending on wind pressure). In addition, an important element of the core member is to form a tapered surface from the outer edge of the core member toward the indoor side in order to obtain the Coanda effect.

3 to 5 specifically show the blowing total pressure varying means, and FIG.
Fig. 4 shows a damper blade 18, 18' which is periodically opened and closed by a link mechanism using a servo motor 17, and Fig. 5 shows a variable blade pitch axial flow fan. 19 pitches are cycled by a servo motor 17 using a link mechanism.

By changing the total pressure of the air blowing system using such a total pressure variation means of the duct air blowing system, a large number of air outlets according to the present invention connected to the duct terminal automatically change the direction of the respective airflow. In addition, the blowing speed also changes as the total pressure changes.

Therefore, according to the present invention, the airflow blowing direction of a large number of air outlets arranged in various places in a building can be controlled by collective control (total pressure fluctuation control) in the blower power unit without individually controlling the air outlet for the duct. And remote control of blowout speed is possible, providing a completely new automatic variable airflow control system for duct air conditioning.

Typical test examples of the outlet of the present invention are listed below.

The test was conducted using the air outlet shown in FIGS. 1 and 2. Figure 6 shows the dimensions of each element of the air outlet used in the test. This air outlet was installed in a sufficiently high ceiling. And the upper opening of this air outlet (300mm x 200
mm) with the same cross-sectional area (300mm x 200mm)
A 600mm primary duct was connected horizontally. This primary duct is horizontally connected to a secondary duct with a cross-sectional area of 300 mm x 300 mm and a length of 6 m, and a centrifugal blower with an upper horizontal blowout is connected to the end of this secondary duct (the upstream end). A suction duct was further connected horizontally to the suction side. Then, two butterfly dampers were attached to the suction duct, and the total pressure inside the duct was adjusted by operating the dampers.

The measurement method for each measurement item is as follows.

(a) Wind speed distribution The wind speed of the air blown out from the outlet was measured at each position indicated by the black circle in Figure 7. The height direction is 1 m apart, and the horizontal direction is 0.5 m apart. Measurements were made using a hot wire anemometer. At that time, the detection unit was fixed to a stand facing the air outlet, and the wind speed at that point was recorded on a recorder. In addition, since the shape of the air outlet is bilaterally symmetrical, the wind speed was measured for the left half space of the air outlet.

(b) Air flow rate 24 measurement points were set up in a grid pattern in the same cross section at the position immediately before the air outlet of the primary duct leading to the air outlet, and a hot wire anemometer was used to record the wind speed at each measurement point. The air flow rate was calculated from the arithmetic mean wind speed and the duct cross-sectional area.

(c) Static pressure at the air outlet A manometer was installed on the duct ceiling at a position immediately in front of the air outlet of the primary duct to measure the static pressure.

Figures 8a-d and 9a-d show the measurement results of the wind speed distribution of air blown out from the outlet when the total pressure of the air inside the duct is changed by adjusting the butterfly damper of the suction duct. It was shown to.

Figure 8 shows a spring with a spring constant of 3 g/mg and a length of 70 mm (the spring shown by 5 in Figures 1 and 2). Figure 9 shows a spring with a spring constant of 12 g/mg and a length of 50 mm. Shows the results when using .

As seen in FIGS. 8 and 9, it can be seen that according to the air outlet of the present invention, the direction of the air flow changes favorably in response to changes in the total pressure within the duct.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a duct outlet showing one embodiment of the present invention, FIG. 2 is a perspective view of the outlet shown in FIG. 1, and FIGS. A cross-sectional view showing an example, FIG. 6 is a schematic cross-sectional view showing the dimensions of each element of the outlet of the present invention used in the test, and FIG. 7 is a schematic cross-sectional view showing the dimensions of each element of the outlet of the present invention. FIG. Figures 8a to 8d are diagrams showing the changes in wind speed distribution due to differences in the total pressure inside the duct in the test of the air outlet in Figure 9 using a spring with a spring constant of 3 g/mg and a length of 70 mm. , Figure 9 a~
d is a diagram showing changes in the wind speed distribution due to differences in the total pressure inside the duct in a test of the outlet of FIG. 9 using a spring with a spring constant of 12 g/mg and a length of 50 mm. 1... Square casing, 2... Fixed plate, 3...
Guide, 4... Core member, 5... Spring, 6
...Folded piece.

Claims (1)

[Claims] 1. A variable airflow outlet for a duct that is connected to an air duct installed in a building and changes the outlet direction according to changes in the total pressure of the air inside the duct, and has an opening surface perpendicular to the air passage direction. An elongated orifice hole is formed in the casing, and two guides are installed so that they spread out from both long side edges of the orifice hole toward the indoor side. A core member having parallel outer edges on both sides is attached to the center of the orifice hole, a slit-shaped opening is formed between the long side edge of the orifice hole and the outer edge of the core member, and a chamber of the core member is formed. The inner surface is formed to be tapered from both outer edges of the core member toward the indoor side, and the relative height of the outer edge of the core member to the long side edge of the orifice hole is determined by wind pressure. The core member itself is installed in the orifice hole via a spring so as to be displaced, and due to the change in the inclination of the slit-shaped opening surface due to this wind pressure, when the wind pressure is high, an airflow biased toward the guide side is generated. A variable airflow outlet for a duct, characterized in that when wind pressure is low, airflow is generated biased towards the tapered surface of the core member.