JPH0444996Y2 - - Google Patents

Description

[Detailed description of the invention] Purpose of the invention (1) Industrial application field The present invention is a damper that is installed at the connection between an air conditioning duct and an air outlet installed indoors, etc. The present invention relates to a wind noise prevention damper that prevents wind noise from occurring.

(2) Prior Art In order to adjust the air flow rate in an air conditioning duct, a mechanism is known in which a damper is interposed in the middle of the duct and the damper blades of the damper are opened and closed.
In particular, in addition to air capacity dampers that directly adjust the flow rate of air flowing inside the duct, dampers are installed at the connection with the air outlet that connects to the duct to send this air into the room, etc. Dampers are commonly used to adjust the flow rate.

9 and 10 show the schematic structure of such a conventional damper, and FIG. 11 shows the installation location of such a damper. In the figure, an air outlet A is provided connected to a duct placed above the ceiling plate C, and this air outlet A expands from the middle to expose its cone through the opening in the ceiling plate C. are doing. A damper Dm is provided at the connection between the duct D and the air outlet A.

As shown in FIGS. 9 and 10, this damper Dm has a lid that opens and closes an opening in a substantially dish-shaped circular frame, and a vane v for diffusing the air flow direction in this opening. It has several. Then, the airflow cut from the duct is sent out to the air outlet A through this opening.

(3) Problems to be solved by the invention However, according to the above configuration, the vane plate v divides the airflow flowing in from the duct, and the vane plate v together with the damper Dm is made of a hard material such as metal. It is not only composed of vane plates v
The sharp tip creates a whistling effect when air flows through the opening from the high-pressure side to the low-pressure side, resulting in wind noise. For this reason, this wind noise becomes a type of noise and has become a problem in indoor environments such as hospitals, schools, conference rooms, etc. where it is necessary to maintain a quiet state.

The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide improved wind noise that prevents the generation of wind noise with a simple structure and without impairing the original damper function. The purpose is to provide a preventive damper.

Structure of the invention (1) Means for solving the problems In order to achieve the above object, the present invention provides a damper installed at the connection between the duct and the air outlet.
Loosely fastened portions 1 provided on both opposing sides of the damper frame 12
The blade body 14 is loosely fastened to the damper frame 12 and opens and closes the interior of the damper frame 12 in a butterfly-like manner. The wind noise prevention damper 10 is characterized in that a flame retardant cloth 22 is stretched over the blade frame 20 and a sponge packing 24 is attached to the outer peripheral surface of the blade frame 20.

(2) Function The blade frame is covered with flame-retardant cloth, and the blade body with sponge padding attached to the outer circumferential surface of the blade frame is configured to open and close like a butterfly inside the damper frame.
The high-pressure airflow flowing in from the direction of the arrow first has its impact force buffered when it collides with the flame-retardant fabric, and is guided by the shape of the fabric to flow along the low-pressure side. When the blade leaves the tip of the blade frame toward the low-pressure side, it is buffered and absorbed by the porous, soft sponge packing, thereby effectively preventing wind noise.

(3) Embodiments Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 1 shows a wind noise prevention damper 1 according to the present invention.
0 is a schematic overall perspective view of the vehicle, showing a cylindrical damper frame 12 made of metal or the like.

A blade body 14 is provided inside the damper frame 12, and the blade body 14 is loosely fastened to loosely fastened portions 16 provided on opposite side walls of the damper frame 12, while being loosely fastened inside the damper frame 12. Open and close like butterfly wings.

As shown in FIGS. 5 and 6, the loosely fastened portion 16 is
By loosely fastening the blade frame 20 of the blade body 14, which will be described later, with screws 18 and nuts 19, the blade body 14 can be supported within the frame 12 and can be opened and closed. Loose tightening of this screw-nut is
The tightening force is such that the blade frame 20 does not move even under a wind speed of 6 m/s, and the opening state can be maintained even at a wind speed corresponding to the maximum air volume that normally occurs at the connection between the outlet and the duct. It maintains its adhesion.

A characteristic feature of the present invention is that the blade body 14 hermetically opens and closes the inside of the damper frame 12 in a butterfly-like manner.
The blade body 14 is connected to the damper frame 12.
A flame retardant cloth is stretched over the entire surface of the blade frame 20, which has an outer circumference smaller than the inner diameter of the cross section, and the blade frame 20
This is because a sponge pad is attached to the outer circumferential surface.

FIG. 2 is a view of the wind noise prevention damper 10 viewed from the cylindrical axis direction. As shown in the figure, the blade frame 20 is made up of two thin thin plates formed into an arc shape and assembled into a set. As shown in FIGS. 3, 5, and 6, these two ends are fastened to each other in the loosely fastened portion 16 using screws and nuts with the above-mentioned appropriate fastening force. This blade frame 20 is formed to have an outer circumference smaller than the cross-sectional inner diameter of the damper frame 12.

The entire area defined by this blade frame 20,
That is, as shown in FIG. 3, the flame-retardant cloth 22 is stretched over the entire surface of the blade frame 20 in a state where the blade frame 20 is fully opened and the inner surface of the damper frame 12 is fully closed. The flame retardant cloth 22 is made of a known cloth with excellent flame resistance and self-extinguishing properties.

Further, on the outer peripheral surface of the blade frame 20, a sponge packing 24 made of a porous and soft material is attached to the blade frame 20.
It is fixed with the same width as the board width, and the blade frame 20
When the blade body 14 is fully closed, the inside of the damper frame 12 is hermetically closed so that the space in the damper frame 12 is airtight.

Now, when there is airflow from the direction of the arrows in FIGS. 1 and 4, the airflow collides with the flame-retardant cloth 22 at an appropriate opening degree of the blade body 14 as shown in FIG.
At this time, the impact caused by the collision is buffered due to the characteristics of the cloth, and the airflow is smoothly divided and guided to the openings at both ends along the cloth 22. Then, this airflow
When it separates from the tip of 4, it separates in an arc shape along the shape, and when it separates to the low pressure side, it is absorbed by the porous sponge packing 24. Therefore, the presence of this sponge packing cushions the high-speed flow that occurs when the airflow moves from the high-pressure side to the low-pressure side, thereby preventing the generation of wind noise.

Furthermore, although this wind noise prevention damper is installed at the connection between the air outlet and the duct, the opening degree of the blade body 14 can be adjusted by the operator by grasping the circular arc portion of the blade frame 20 from below the air outlet. It can be set arbitrarily.

Further, the blade body 14 is attached to the blade frame 20 using a flame retardant cloth 22.
Since the damper frame is constructed by stretching the damper frame, and the sponge gasket 24 is attached to the outer circumferential surface of the blade frame, the flow rate adjustment of the airflow and the operation of closing the inside of the damper frame in an emergency are performed thereby.

FIGS. 7 and 8 show a modification of the wind noise prevention damper according to the present invention, and the same members as in the embodiment described above are given the same reference numerals, and their explanations will be omitted.

According to this modification, in addition to the configuration of the above embodiment, a sponge packing 30 is fixed to the inner wall circumferential surface of the damper frame 12 on the low-pressure downstream side of the air flow, that is, in the direction in which the blade body 14 opens and closes. be.

As a result, when the blade body 14 is opened to a predetermined opening degree, when air flows out to the low-pressure downstream side from both openings, it collides with the sponge packing 30 and the airflow is concentrated in the approximate center of the damper frame 12. It will be done.
By rectifying the airflow in this manner, the conditioned air from the outlet connected downstream can be more effectively diffused into the desired space.

Note that the wind noise prevention damper according to the present invention is not limited to the above-mentioned embodiments, and even when the cross section of the damper frame is rectangular, the same effect can be achieved by adopting a corresponding rectangular blade configuration. The effect will be obtained.

Effects of the Invention As explained above, according to the wind noise prevention damper according to the present invention, the damper is loosely fastened to the loosely fastened portions provided on the opposite side walls of the damper frame, and the inside of the damper frame is shaped like a butterfly. The blade body has a blade body that opens and closes airtightly, and this blade body has a flame retardant cloth stretched over the entire blade frame having an outer circumference smaller than the cross-sectional inner diameter of the damper frame, and a sponge padding is attached to the outer peripheral surface of the blade frame. As a result, wind noise can be prevented from occurring with a simple structure without impairing the original damper function.

[Brief explanation of the drawing]

1 to 6 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a general schematic perspective view of the wind noise prevention damper, and FIG. 2 is an explanatory diagram as seen from the axial direction of the cylinder. , FIG. 3 is an explanatory diagram of the blade body as seen from the cylindrical axis direction in a fully closed state, FIG. 4 is a cross-sectional view taken from FIG. 3, and FIG. 5 is a partially enlarged perspective view of the loosely fastened portion. 6th
The figure is an enlarged sectional view of the same part, FIG. 7 is an overall schematic perspective view showing a modification of the present invention, FIG. 8 is a longitudinal sectional view of the same, and FIGS. 9 to 11 show a conventional damper. It is an explanatory diagram. 10...Sound damper, 12...Damper frame,
14...Blade body, 16...Loose fastening portion, 10...Blade frame, 22...Flame retardant cloth, 24...Sponge packing.

Claims (1)

[Scope of utility model registration request] A damper provided at a connection between a duct and an air outlet has a blade body that is loosely fastened to loosely fastened parts provided on opposite side walls of a damper frame and opens and closes the inside of the damper frame in a butterfly-like manner. , this blade is
A wind noise prevention damper characterized in that a flame retardant cloth is stretched over the entire surface of the blade frame having an outer circumference smaller than the cross-sectional inner diameter of the damper frame, and a sponge pad is adhered to the outer peripheral surface of the blade frame.