JPH0424336Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an air supply/exhaust port for supplying or exhausting air to an air conditioner, electrical room, elevator machine room, etc. installed inside a building. be.

[Conventional technology]

For example, if the width of the air supply and exhaust ports that open on the outside wall is limited, such as the air supply and exhaust ports in a wall-through type air conditioner, adding a rattle to the opening end will improve the width of the ventilation path. Since the effective width becomes narrower and the width of the opening must be widened accordingly, ducts without louvers are often configured to directly take in outside air and exhaust indoor air.

However, as mentioned above, if the duct is without a louver, rainwater is likely to be blown in, especially when
During extreme weather such as a typhoon, a large amount of rainwater can enter the room through the air supply and exhaust vents. For this reason,
The waterproofing equipment inside the room and the drainage equipment for water that had entered the room were large-scale, which was disadvantageous in terms of space.

For this reason, we installed a valve (damper) that automatically closes the flow path inside the pipe when wind pressure above a certain level acts inside the rising part of the pipe installed on the indoor side that penetrates the outside wall. An air supply/exhaust port was proposed in Publication of Utility Model Publication No. 10816/1983.

However, in this conventional example, the damper is
It is supported so that it can swing freely using one end as a fulcrum, and when it swings to the open position due to its own weight,
The damper had a structure in which the regulating device attached to the damper was brought into contact with the inner surface of the pipe, and the entire one side of the damper received wind pressure from below, resulting in the following problems, and it has not been successful in practical use. It has not yet been brought under control.

In other words, one of the problems is that the damper is swingable with one end as a fulcrum, so when wind is blown into the pipe, one side of the damper receives wind pressure in the closing direction, causing it to open. The damper closes suddenly, that is, closes rapidly with a strong force, and the noise generated by the closing operation is large and difficult to muffle even with cushioning material.

An even bigger and potentially fatal problem is that the damper repeatedly opens and closes in strong winds. In other words, the entire one side of the damper receives wind pressure in the closing direction, so the damper suddenly closes, and when the damper closes, no air can pass through it at all, and there is no pressure to hold the damper down, so the damper suddenly opens wide due to its own weight. ,
When the damper opens, air passes through it, and the damper receives wind pressure in the closing direction on its entire side, causing it to suddenly close again, repeating rapid opening and closing operations with large strokes.

As a result, not only does this cause flapping noise, but also during rainy weather, the damper repeatedly opens and closes, causing water to enter and shut off, which prevents rainwater from entering through the air supply and exhaust ports. The original purpose cannot be achieved.

In addition, as described in Japanese Utility Model Publication No. 57-20981, the pressure receiving areas of the damper parts located above and below the horizontal horizontal shaft that pivotally supports the damper are made different, and the pressure receiving area is changed by the difference in the pressure receiving area. The damper may be configured to close due to the difference between the wind pressure in the closing direction that acts on the lower damper part, which has a larger area, and the wind pressure in the opening direction that acts on the upper damper part, which has a smaller pressure-receiving area. Although this is conceivable, the inconvenience of the damper suddenly closing and producing loud noise cannot be solved.

That is, as shown in FIG. 4, in the damper 2 which is rotatably supported by the horizontal horizontal shaft 3 at a position eccentric from the center, the pressure received by the damper parts 2A and 2B located on both sides of the horizontal horizontal shaft 3 is The difference in area (area projected in the direction of air flow) A-B, A'-B' is
As the damper 2 swings in the closing direction, it becomes larger and becomes fully closed (position perpendicular to the air flow direction).
It is at its maximum when it is at .

Therefore, in the initial stage, the damper 2 slowly closes because the difference in pressure receiving area is small, but as it closes, the difference in pressure receiving area increases and the damper 2 closes rapidly.

As a result, a large noise is generated when the damper 2 is closed.

[Problem that the invention attempts to solve]

In view of the above-mentioned conventional drawbacks, the present invention reliably prevents rainwater from entering through the air supply and exhaust ports, and also allows the dungeon to close slowly and suppress noise generation even in strong winds. The purpose of this project is to provide air supply and exhaust ports.

[Means for solving problems]

The technical measures taken by the present invention to solve the above problems are as follows. That is, the air supply/exhaust port according to the present invention is characterized in that an inlet for air that is open to the outdoors is formed on one side of the lower end, and an outlet for air that is open to the indoors is formed on the upper end. A state in which a damper for opening and closing the air flow path is rotatably supported in the center of the air supply/exhaust box with a horizontal horizontal axis in the air flow path of the air supply/exhaust box with a vertical air flow path formed therebetween. At the same time, the damper part located on one side of the horizontal horizontal axis is made heavier than the other damper part, and is biased into a vertical open position by its own weight, and the tip of the heavier damper part on one side is placed on the air inlet side. A bent claw portion is formed at the tip of the other damper portion, and a claw portion bent toward the opposite side from the air inlet is formed at the tip of the other damper portion, and a contact portion for the damper is formed on the opposing inner surface of the box. It lies in the fact that it was formed.

[Effect]

According to the above configuration, if the wind speed is below a certain level, the damper is maintained in a vertical open position due to the weight difference between the damper parts located on both sides of the horizontal horizontal axis, so the pressure drop is significantly different from the case without a damper. It is possible to supply or exhaust the required amount of air without any need for air supply or exhaustion.

However, when the wind speed exceeds a certain level, the damper closes against the biasing force, and the space on the front side of the damper inside the box and the external space approach equal pressure, reducing the movement of air. This will prevent rainwater from entering.

In this case, the damper swings around the horizontal axis as a fulcrum, so the wind pressure generates rotational forces in opposite directions on the damper part located on one side of the fulcrum and the other damper part, but since the fulcrum is in the center, , the difference in the pressure receiving area (area projected in the air flow direction) of both damper parts is always zero no matter what angle the damper is at, and the forces of both cancel out and become balanced.

Therefore, the damper closes due to the difference in air resistance (resistance to the wind) caused by the claws formed at the tips of the respective damper parts.

The above difference in air resistance is zero when the airflow is zero (the damper is fully closed), and the smaller the airflow is, the smaller the difference in air resistance becomes. It will close slowly.

In addition, when the damper is completely closed, there is no air flow and there is no difference in ventilation resistance, so the damper slowly rotates in the opening direction due to the difference in weight between the damper parts located on both sides of the fulcrum. do. If even a small amount of airflow occurs due to the rotation of the damper, the damper will again be gently closed due to the difference in ventilation resistance.

In this way, the damper opens and closes very slowly when it is fully closed, which prevents rainwater from blowing in and suppresses noise generation when the damper is closed.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows an air supply/exhaust port according to the present invention. In this air supply/exhaust port, an air inlet a open to the outdoors is formed on one side surface of the lower end side, and an air outlet b open indoors is formed on the other side surface of the upper end side, and the inlet a and the outlet b are connected to each other. In order to open and close the air flow path of the air supply/exhaust case 1 by installing the air supply/exhaust case 1 having a vertical air flow path formed therebetween at a suitable location on the outer wall W. A damper 2 is provided with its center rotatably supported by a horizontal horizontal shaft 3, and a weight 5 is attached to a damper portion located on one side of the horizontal horizontal shaft 3, so that the damper portion can be attached to the other damper. The damper part is made heavier than the rest of the damper part and biased into a vertical open position by its own weight, and the tip of one of the heavier damper parts has a claw part 2a bent toward the air inlet a side, and the tip of the other damper part has a claw part 2a bent toward the air inlet a side. A claw portion 2a bent toward the air outlet b side is formed respectively, and a damper 2 is provided on the opposing inner surface of the box 1.
It is constructed by forming abutting portions 1a, 1a against the holder.

The abutting portions 1a, 1a are provided with a fin-shaped cushion material 4 to soften the sound generated by the collision of the damper 2 and to prevent gaps from forming.

The above-described air supply/exhaust port is applied, for example, to an air supply port in a wall-through type air conditioner, as shown in FIG. c in FIG. 2 represents the exit b
6 is an evaporator, 7 is a condenser, and M is a window frame. A portion of the return air from the room is exhausted outdoors from an exhaust port (not shown) adjacent to the air supply port, and an amount of outside air corresponding to the amount of exhaust air is taken in from the air supply port.

According to the above configuration, the wind speed during air conditioning operation (2 to
5m/s), damper 2 is at rest,
When the wind speed exceeds a predetermined value (for example, 8 to 12 m/s), the damper 2 rotates in a certain direction (in the direction of arrow x) around the horizontal horizontal axis 3, blocks the ventilation path inside the box 1, and reduces the wind speed. When it falls, it will return to its original open position.

In this case, since the damper 2 swings about the horizontal axis 3 as a fulcrum, wind pressure generates rotational forces in opposite directions in the damper portion 2A located on one side of the fulcrum and the damper portion 2B on the other side of the fulcrum. In other words,
Wind pressure on one damper portion 2A acts as a force in the direction of closing the damper 2, and wind pressure on the other damper portion 2B acts as a force in the direction of opening the damper 2. Since the fulcrum is at the center, both damper parts 2
The difference A-B, A'-B' in the pressure receiving area (area projected in the air flow direction) of A and 2B is always zero (A-B=0, A'-B') no matter what angle the damper 2 is at.
B' = 0), and the two forces cancel each other out and become balanced.

Therefore, the damper 2 includes each damper portion 2A,
The closing operation is caused by the difference in air resistance (resistance to the wind) between the claws 2a, 2a formed at the tips of 2B.

The above difference in air resistance is zero when the ventilation amount is zero (the damper is fully closed), and the smaller the ventilation amount is, the smaller the difference in air resistance becomes. 2 will close slowly.

In addition, when the damper 2 is completely closed, there is no air flow and there is no difference in ventilation resistance, so the damper 2 is loosened due to the difference in weight between the damper parts 2A and 2B located on both sides of the fulcrum. and rotate in the opening direction. And damper 2
If even a small amount of airflow occurs due to the rotation of the damper 2, the damper 2 will be gently closed again due to the difference in ventilation resistance.

In this manner, the damper 2 performs an extremely gentle opening and closing operation near the fully closed position, which prevents rainwater from blowing in and suppresses noise generation when the damper 2 is closed. [Effects of the invention] Since the present invention has the above-mentioned configuration, the damper closes in strong winds and prevents rainwater from blowing in. Furthermore, when the damper is fully closed, the Since the damper opens and closes, the noise generated when the damper closes is suppressed.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of an air supply/exhaust port showing an embodiment of the present invention; Fig. 2 is a schematic perspective view showing the air supply/exhaust port applied to an air supply/exhaust port in a wall-through type air conditioner; Figure 3 is an explanatory diagram of the action, Figure 4
The figure is an explanatory diagram of the operation of the conventional example. 1... Box for air supply and exhaust, 1a... Contact part, 2
...damper, 2a...claw portion, 3...horizontal horizontal axis,
a...Entrance, b...Exit.

Claims (1)

[Scope of utility model registration request] An air inlet that is open to the outdoors is formed on one side of the lower end, and an air outlet that is open to the indoors is formed on the upper end, and a vertical air flow path is formed between the inlet and the outlet. A damper for opening and closing the air flow path is provided in the air flow path of the air supply/exhaust box, the center of which is rotatably supported on a horizontal horizontal axis, and the damper is located on one side of the horizontal horizontal axis. The damper part is made heavier than the other damper part and biased into a vertical open position by its own weight, and the tip of one of the heavier damper parts has a claw part bent toward the air inlet side, and the other damper part has a claw part bent toward the air inlet side. The air supply/exhaust port is characterized in that a claw portion bent toward the side opposite to the air inlet is formed at the tip of the box, and a contact portion for a damper is formed on the opposing inner surface of the box. .