JPH04153488A - Louver - Google Patents

Abstract

PURPOSE:To increase the passing area of a louver by a method in which blades set at a given angle at a fixed interval are shaped into a curved form becoming parallel, upward projected, downward projected, and parallel again from one end toward the other end. CONSTITUTION:A louver is made up by setting blades 1 in parallel at a given angle by raising their height from the left to the right side at a fixed interval on a frame 5. The cross-sectional form of the blade 1 is shaped into one in which outdoor side edges 1a are parallelized, the downwardly projected slopes 1b are connected with upwardly projected slope 1c by a gently curved line and gently connected to the indoor side edge 1d. Air current flowing between the blades 1 goes along the shape of the blade 1, permitting the distribution of air stream to be comparaviely uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industry> Second Field of Application The present invention relates to a louver provided at an air intake port of a building.

<Prior art> As is well known, this type of louver has a structure in which a plurality of blades are arranged in a row with the outdoor side 6 (6) sloped so that it is lower, thereby preventing rain from entering the room. Air can be brought into the room from outside while preventing air from entering the room.

Figure 5 shows an example of the cross-sectional shape of the conventional wing (]
), the edge is bent into a square shape to form the ice-cutting part 21, (1)) the edge is bent in a straight line to form the gutter 22, or the edge is bent in a straight line (1) as in (c) to form the side groove 22. There are vortices AQ and vortices 2 and 3 respectively, and regarding the indoor edge,
As shown in (d), there are those with a vertical ridge 21 that prevents water from entering, and those that have a water return 111i 2 as shown in (+, , ri).
5 was formed: There is now (for example, in 1985
87883 and 60-587891", Public 2 "Reference).

In addition, with such a structure, a shielding plate is installed on the roof to reduce noise leakage. /, r 11. t-, also have been proposed (e.g. 1.1 between Showa f') i-)
22:35871; see publication).

＼While trying to invent or solve ζ2 Problem 5 1: In the field of 1 ellipse It'll form 4 no as described below,
゛(The outer edge is water L)
4゛l adventure 21 2 +I l2 p mountain cherry blossoms 1.
゛Mada (I, wings [7” spacing horns in one style))),
(Mepa) At the indoor edge, the distance between adjacent vanes is similarly narrowed by the standing portion 24 and the water return tMIJ 25. For this reason, the passage of the airflow passing through this area is constricted, the flow velocity increases, and a large vortex is generated.
As the resistance to airflow increases, there is a greater possibility that raindrops will be sucked into the room by the high-velocity airflow.

Figure 6 is the simplest Figure 4 (a) with a drainer 21.
This is an example of the air flow, flow velocity distribution, and generation of eddy currents in the shape of the blade, Jl is the blade plate, 12
]3 is a vortex, 14 is a water droplet, and B is a flow velocity distribution curve. In this case, as shown in curve B, the draining section 2
Since the flow velocity increases at the lower edge of the ice cube 1, the ice droplets 14 are easily drawn into the room by riding on the airflow at this portion where the flow velocity is high.

Further, the area of the vortex portion 13 is wide and the effective passage area is limited.

In addition, in the case where a sound insulating plate is provided, the structure becomes complicated and the passage resistance against airflow becomes large.

This invention focuses on these problems and creates a louver with a small increase in flow velocity and a large effective passage area. j thing 1
``This was done as a temporary measure.

<Means for solving the problem> In order to couple the above L1 target, in this invention, the feather 4J
The shape of the surface treated with J is almost water)), the outdoor side edge, F
The sloping part is convex in the direction, and the slanted part is convex upward. Each slat is arranged.

〈〈〈〈〈〈〈〉〉 The streamlines of the airflow flowing between each blade plate or the smooth roar that followed the shape of the blade plate, and the flow velocity distribution was also large compared to cow 1.
Therefore, the area of the vortex flow section becomes smaller 1, so that the effective passage area is less narrowed and the passage resistance is reduced. In addition, the 113 drops received by the slats remain on the almost horizontal outdoor edge, making them difficult to fall, and due to the inclination of the slats, they flow to the left L+ with a lower force. At the same time, there is no possibility that the water droplets falling directly on the outdoor side edge H'L, lj will be sucked into the room due to the low speed of the airflow.

<Example> Next, an example of the present invention will be described. Figure 1 is a front view;
FIG. 2 is a longitudinal sectional view, FIG. 3 is a horizontal sectional view, and FIG. 4 is an operation explanatory diagram corresponding to FIG. 6.

In the figure, 1 is a blade plate, and 5 is a frame in which the blade plate 1 is cut (-J). 1b
and the sloped part IC that is convex in two directions continue smoothly,
Furthermore, an almost horizontal indoor edge 1d is smoothly connected to this, and a plurality of vanes 1, 1... are arranged at regular intervals and on either the left or right side when viewed from the front. For example, they are arranged in parallel and tilted downward to the left. The curvatures of the inclined portion 1b and the inclined portion IC are appropriately selected so as to obtain a smooth cross-sectional shape. Also, the interval between each blade plate 1 is the indoor edge 1d and the outdoor edge of the adjacent upper blade plate? '? l' ] and a are selected so that they are approximately the same height, but in particular when it is necessary to make the interior of the room invisible from the outside, it is necessary to make the - side of the K part 1d so that it is at the same height as the upper slat. The lower surface of the edge 1Nll 1a is raised so that it is at a high position.

On the left side of the frame 5, the left end of each slat 1 is marked with a sunken 1)).

This example is one knee 3. It has a configuration like +li, and when it is installed and used in a building's air intake [-1, etc., the air flow is as shown in Figure 4. This figure illustrates the flow and flow velocity distribution of air currents, and the occurrence of eddy currents, etc. 2 is the 'lfl heel i5A, 3 is the vortex part, 4 is the water droplet, and Δ is the flow velocity distribution curve. In other words, since the cross-sectional shape of the vane plate 1 is a combination of smooth curves, the streamline 2 of the airflow flowing between each vane plate ], ] follows the shape of the vane plate]. Therefore, the flow velocity distribution is relatively uniform without a large portion in 44 like the curve Δ, and the area of the vortex portion 3 is also small. Therefore, the sixth
When compared to the case shown in the figure, the effective passage area 'L becomes much larger, the passage resistance is reduced, and the 7-inch wind blow that occurs when the airflow is high speed is eliminated.

On the other hand, the rain that is caught by the slat 1 becomes water droplets 4, stays on the outdoor edge 1a, becomes difficult to fall, and flows to the left along the slope of the slat 1 from the downspout 6. be discharged. Furthermore, even if the water droplets 4 are directly routed from the outdoor edge 1a, because the flow velocity is low, they cannot ride the airflow and fall onto the lower slat, and eventually flow to the left side and reach the downspout. Since it is discharged from 6, it is prevented from being sucked into the room.

Therefore, if this louver is installed, for example, in the ventilation opening of an engine-driven generator room where indoor air is forcedly ventilated, it is possible to use a louver with a smaller opening area than a conventional louver due to its low passage resistance. Ventilation performance is achieved, and since the opening area is small, operating noise leaking outside the room is reduced even without installing a sound insulating board, improving the soundproofing effect, and eliminating wind noise that conventionally occurs with louvers. In addition, water droplets are prevented from being sucked into the room even in the event of strong wind and rain, and in particular, it is possible to eliminate electrical system accidents and failures caused by water droplets adhering to the interior.

In addition, the angle 01 of the outdoor side edge 1a is selected in the range from 15 degrees downward to +20 degrees upward with respect to the horizontal plane, and the left and right inclination angle of the slats is 03 degrees. is selected to be about 2° to 20°. I-Outdoor edge 1. Even if a is slightly downward, if this is the case, water will flow directly from the outdoor edge 1a due to the surface tension of the water.
There is little to watch. In addition, since the edge 1-1 faces upward, forming a gutter-like shape, water retention is better.Also, the inclination angle of the indoor edge [d], which is not directly exposed to raindrops, is determined by the height of the large moon indoors. The selection deviation may be appropriate depending on the arrangement of the equipment.In other words, if there is a distance to the large moon, it may be slightly upward, and if it is better not to direct the airflow too upwards, it may be selected slightly downward.

<Effects of the Invention> As is clear from the explanation below, the present invention has a blade plate having a cross-sectional shape in which the almost horizontal outdoor edge is connected to the indoor edge by a smooth curve, Furthermore, since each blade is arranged so that it is tilted to either the left or right when viewed from the front, the air passage is not constricted and the streamlines follow the blades smoothly. The eddy flow part becomes smaller, the passage resistance is reduced, and the riq
This improves the drainage of drops and eliminates the possibility of them being sucked into the room.

Therefore, large ventilation performance can be obtained with a small open area,
Furthermore, since the opening area is small, the soundproofing effect can be improved without the need for a sound insulating plate that would complicate the structure, and the louver can also prevent water droplets from entering the room even in strong wind and rain.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a vertical sectional view, FIG. 3 is a horizontal sectional view, and FIG. 4 is an operation explanatory diagram. FIG. 5 is a diagram showing a cross-sectional shape of a conventional blade plate, and FIG. 6 is an explanatory diagram of the operation of the conventional example. DESCRIPTION OF SYMBOLS 1... Vane board, 1a... Outdoor side edge, lb, lc, slope part, 1d... Indoor side edge, 2... Streamline, 3... Whirlpool part, 4... Water drop, 5...Frame, A...Flow velocity distribution curve. Patent Applicant Yanmar Diesel Co., Ltd. Haka 1 Representative Patent Attorney Shino 1) Actual Diagram Diagram

Claims (1)

[Claims] (1) In a louver with a structure in which multiple blades are arranged in parallel with the outdoor side being lower, the cross-sectional shape of the blades is set such that the outdoor side edge is almost horizontal and the sloped part is convex downward. A louver having a shape in which an upwardly convex sloping part and a nearly horizontal indoor edge are smoothly connected, and each blade plate is arranged in an inclined state when viewed from the front. .