JPH08327132A - Air volume adjustment damper - Google Patents

Abstract

(57) [Abstract] [Purpose] A simple structure prevents the generation of large wind noise due to opening and closing of the blades, prevents drift in the vicinity of the damper blades, and has a rectifying function. Greatly improve. [Structure] Casing 12 that forms a flow path P for wind therein
And a blade body that is rotatably supported in the casing 12 and that opens and closes the flow path, and the blade body 14 is provided with a plurality of holes 20. Is. Air flow control to some extent with a simple structure,
Performs rectification.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-conditioning damper, which is installed in the ceiling of a building or the like and is interposed in the middle of a duct, and more particularly to a damper for adjusting an air volume.

[0002]

2. Description of the Related Art There is known a mechanism in which a damper is interposed in the middle of a duct or the like to open or close damper blades of the damper in order to block air flowing in an air-conditioning duct or adjust the air volume. FIG. 10 is a schematic cross-sectional explanatory view of one conventional air flow rate adjustment damper. As shown in the figure, such a damper includes a box frame F having a required thickness and a frame F inside the frame F. One end of the rotating shaft S has a rotating shaft S pivotally supported by a provided bearing, and a butterfly blade V fixed to the rotating shaft S to open and close the ventilation opening in the frame F. Is extended and its end is connected to the handle or the output shaft of the motor.

[0003]

However, in the above-mentioned conventional air volume adjusting damper, when the blade is rotated so as to close the flow path, the air volume is controlled by pushing the air to the upper and lower ends of the blade, so that a large opening is provided. Therefore, air is forced to flow to the downstream side all at once, and a large wind noise is apt to occur, and how to reduce this noise was an important issue during the development stage of the air conditioning damper. Further, in the above conventional air volume adjustment damper, the relationship between the rotation angle and the air volume is likely to change in a curve, and particularly when the flow path is close to the fully closed state, the air volume changes rapidly even with a slight change in the opening of the blade. Then, when the air volume is controlled by comparing the target value and the response value by driving the motor, there is a problem that a hunting operation occurs and the air volume cannot be controlled well. Further, in the above-mentioned butterfly blades, etc., air is pushed to the upper and lower end sides of the blades as described above, so that a drift occurs on the downstream side of the flow. As a result of the uneven distribution of, there is a problem that the detection accuracy of the wind speed sensor is poor.

The present invention has been made in view of the above conventional problems, and its main purpose is to prevent the generation of a large wind noise due to opening and closing of the blade with an extremely simple structure and to prevent the damper blade from being damaged. An object of the present invention is to provide an air volume adjustment damper that can prevent uneven flow at the edge, have a rectifying function, and significantly improve the air volume detection accuracy of the sensor.

[0005]

In order to achieve the above object, an air volume adjusting damper according to the invention of claim 1 is provided with a casing 12 which forms a flow passage P for the wind therein, and is rotatable in the casing 12. A blade body 14 that is axially supported by the blade body 14 and that opens and closes the flow path P. The blade body 14 is provided with a plurality of holes.
Consists of

[0006]

In the air volume adjusting damper according to the first aspect of the present invention, the casing is provided with a casing for forming a flow passage of the wind therein, and a blade body for opening and closing the passage while rotating in the casing. The body is pierced with a plurality of holes. When the blade body rotates in the flow path, for example, it gradually tilts from the fully open state, and the blade body gradually increases the resistance to suppress the flow of wind, but when opening and closing the flow path in the flow path, the blade body is perforated. A small amount of air always flows through the numerous holes created. Since the wind is divided by a plurality of holes and flows to the downstream side, it can be used as an extremely low-noise damper with no large noise or wind noise. In addition, the rectification effect and the drift prevention effect are excellent, and the sensor detection accuracy is greatly improved. In addition, even when the blade body is held in a state of being inclined with respect to the flow path,
There is no wind noise, and the amount of air flowing through the flow path can be adjusted while flowing the divided air from the multiple holes opened in the blade body to the downstream side. There is nothing to do. The rotation operation of the blade may be performed manually by extending one end of the rotation shaft to the outside, or may be performed by a driving device such as a motor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a first embodiment of an air flow rate adjusting damper 10 according to an embodiment of the present invention, in which a bearing 16 is provided so as to face a metal hollow cylindrical casing 12 in the diameter direction. The rotary shaft 18 is rotatably supported by the bearing. The circular blade 14 is fixed to the rotary shaft 18 along the diametrical direction, and rotates in the flow passage P as the rotary shaft 18 rotates to open and close the air flow passage P.

The blade body may be attached to the rotary shaft 18 by any structure. For example, a shaft is simply supported by a bearing, and the ends of the shaft are fixed to both sides of the blade so as to be rotatably supported. May be. As shown in the figure,
Is a size capable of closing the flow path P in the casing 12,
It is formed in a substantially circular shape.

A feature of the present invention is that a plurality of holes 20 are formed in the blade body 14 that opens and closes the air flow path. Therefore, the air flow rate adjusting damper 10 always allows the minimum air flow rate from the fully opened state of the flow path shown in FIG. 3 to the intermediate opening degree and the fully closed state shown in FIG. The blade body 14 is, for example, a single circular blade made of metal, and a plurality of circular holes are formed in the blade body by punching, pressing, wire cutting, laser or any other processing method. Therefore, when the blade body 14 is positioned so as to close the flow path, that is, so as to intersect with the flow, the surfaces formed by these holes 20 are also arranged in the direction intersecting with the flow. The blade body 14 is not limited to being formed of one steel plate. It may be formed by combining a plurality of mold materials, or may be cast. Also, the material is plastic synthetic resin, metal, aluminum and other light metals,
alloy. ． ． Other arbitrary materials may be used.

The immediate purpose of the present invention is not to keep a minimum amount of air flowing in the flow path. While continuing to flow air, necessary air flow rate control is performed with the air flow rate set by the aperture ratio of the plurality of holes as the maximum limiting amount. Also,
Depending on the setting of the aperture ratio, it is possible to control the flow rate to a level near the fully closed state of the conventional blind blade type butterfly blade. Then, at this time, in the case of the conventional blind blade, what causes a very large wind noise and other noises in the vicinity of the fully closed state and causes a problem in use,
It can function as an extremely low noise damping damper. It is possible to maintain a volume level several times lower than the conventional damper under the same conditions, and this point has been proved experimentally.

Further, if a plurality of holes 20 are bored in the entire blade body, air flows in the entire cross section of the flow path, so that uneven flow of air on the downstream side can be prevented. In addition, even if turbulence or the like occurs on the upstream side at the same time, the plurality of holes 20
Therefore, it is possible to flow uniform air to the downstream side to rectify the flow, and therefore, the air can be used immediately before the air outlet or the duct branch or at a place close to the indoor load side. Further, when a sensor for detecting the air volume is installed, it has a rectifying function, so that the detection accuracy is high even if the sensor is installed upstream of the damper.

In the embodiment, the plurality of holes 20 are circular holes, which are distributed throughout the blade body 14 and opened. The number and the shape of the plurality of holes 20 may be arbitrary, and the intervals between the holes may be arbitrarily set. If the aperture ratio, which is the ratio of these holes 20 to the entire flow passage cross section, is set to be large, the sound deadening effect is enhanced. good.

The diameters of the plurality of holes may be different for a plurality of types as much as possible, or the same hole shape may be arranged uniformly, randomly or in various forms.

Although not shown in the embodiment, a manual handle may be connected to the end portion side of the rotary shaft 18 or may be connected to the output side of the drive motor. The shape of the blade body may be an elliptical shape, a square shape, or any other shape, or may be a square multi-blade damper as shown in FIG. Further, for example, a felt cloth may be adhered to the vane plate, or a flocking process may be performed so that a higher sound deadening action is performed. Such a damper having a blade body that does not completely block the flow path can be suitably installed and used, for example, immediately before a ceiling outlet in a room. It is rare that the air outlet itself is completely closed, and rather it is rare because the opening / closing control is usually performed by other flow rate control dampers or airtight dampers at branch points of ducts such as in the ceiling. Can be said. If a wind noise is generated when performing a certain amount of airflow control immediately before such an air outlet, it will directly affect the interior of the room and cause problems in use. In addition, the wind noise is not generated due to the muffling effect, and furthermore, the air flow is rectified when the air is blown into the room, which is particularly necessary at the air outlet. In addition, it may be installed in an air-conditioning duct or any other place as needed.

Next, the operation of the air volume adjusting damper 10 of the above-mentioned embodiment will be described. In FIG. 3, when the air flows in the direction of the arrow, the blade body 14 is in a state where the flow path P is fully opened.

When the blade body 14 is rotated by driving a drive motor (not shown) to close the flow passage P, the blade body 14 is gradually displaced in the direction of closing the flow passage P. At this time, since a plurality of cell-shaped openings are formed by the plurality of holes 20 in a divided manner, the blade body 1 is allowed to flow a small amount of air flow f downstream from this communication opening.
The air volume is reduced by the resistance of the main body of No. And
When the air flow path shown in FIG. 4 is fully closed, the air flow rate is set to the lowest value, which is set by the aperture ratios of the plurality of holes. Also, at this time, as in the middle of the rotation of the blade body 14, some air flow f flows through the plurality of holes 18 of the blade body 14, so that wind noise and other noises are effectively generated. Will be suppressed.

In the case of the conventional blind blade of the blind plate type, a large wind noise is generated near the fully closed flow passage, but in the multi-blade blade of the present application, the wind noise is generated even when the conventional blade is close to full closed. It does not cause it.

Further, by this, for example, the sensor mounted on the upstream side can stably and faithfully detect and reflect the air flow extremely close to the actual air flow without being affected by the drift. Further, this enables highly accurate adjustment of the air volume extremely close to the target value, and in particular, it can effectively function depending on how it is also used as a damper for a recent VAV system. Therefore, unlike the conventional butterfly blade, there is no wind noise or other noise that occurs when displacing while rapidly narrowing the inside of the flow path,
Compared with the conventional method, the noise amount can be suppressed significantly even under the same conditions.

Next, FIGS. 5, 6 and 7 show an air volume adjusting damper 10 according to a second embodiment of the present invention.
As is apparent from the drawing, in this air volume adjusting damper 10, two semi-elliptical blades 14 supported by a support shaft portion 22 are provided in a hollow cylindrical casing 12 so as to be openable and closable.

The support shaft portion 22 is constructed by mounting two semi-elliptical blades 14 on a support shaft 24 attached to the casing 12 so as to open and close with a required frictional resistance. That is, the bases of the two blades 14 are attached to the support shaft 24 so that they can be opened and closed like a hinge. Further, a guide portion provided with an arc groove that can stand still at the set opening position of the damper blade is provided at the edge of the blade body, and a guide holding portion 26 having a locking pin fitted therein is provided. ing. As a result, similarly to the first embodiment, the air volume control is performed while maintaining the noise reduction effect while always accommodating a small amount of air flow, and at the same time, the flow is rectified to make the flow in the flow path flowing to the downstream load side, etc. uneven. Will be effectively suppressed. Further, this can improve the sensor detection accuracy of the air volume.

An air volume adjusting damper 1 according to the second embodiment.
0 is attached to, for example, the inlet connection portion of the chamber box that is directly connected to the upper portion of the indoor air outlet as shown in FIG. 7, and as shown in FIG. By grasping and manually rotating the blade body portion, an appropriate opening degree is adjusted. Also in the split blade type damper of the second embodiment, the rotary shaft may be connected to a prime mover input shaft such as a motor to be driven.

FIG. 9 is a schematic explanatory view showing a state in which the air flow rate adjusting damper is installed just before the neck portion of the air outlet or the upstream side inlet. In this case, the damper has a flow control function as described above, and a muffling effect. Since it has the rectifying function and the drift preventing function, it is not necessary to attach the chamber box immediately before the air outlet, and the function of the air volume adjusting damper can be fully exerted and used more effectively.

The structure is not limited to the semi-elliptical shape as in the embodiment, but may be a semi-circular shape in which the stopper is provided on the inner wall of the flow path. Further, such a divided blade may have a quadrangular divided blade structure. Further, the bearing portion or the hinge portion may have other arbitrary configurations and is not limited to the embodiment.
Further, the mounting direction of the blade body with respect to the air flow direction may be opened and closed toward the upstream side, or may be opened and closed toward the downstream side.

The air volume adjusting damper of the present invention is not limited to the configuration of the above-mentioned embodiment, but may be modified arbitrarily without departing from the essence of the invention described in the claims.

[0025]

As described above, according to the air volume adjusting damper of the first aspect, the casing forming the air flow passage therein, and the casing rotatably supported in the casing to open and close the flow passage. And a plurality of holes are bored in this blade body, so that even when the opening of the blade is changed, the plurality of holes are made to communicate with each other and a plurality of holes are divided from this opening. The generated air flow can prevent wind noise and other noises, and the air flow from the entire surface of the vane plate does not cause uneven flow at the time of turning in the closing direction. Uniform air can flow to the side. Therefore, it is possible to arrange the air conditioner close to the load such as the air outlet and the like, and it is possible to greatly expand the use of this kind of air conditioner damper. Furthermore, because it does not generate a drift, the detection accuracy of the wind speed sensor installed on the upstream side is greatly improved, and it is not necessary to provide multiple sensors to detect the entire cross section of the flow path. It is possible to detect a high wind speed, and it is possible to save the sensor cost and its mounting cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an air volume adjusting damper according to a first embodiment of the present invention.

FIG. 2 is a plan view of the blade body of the embodiment as viewed from the front side of the flow path.

FIG. 3 is an operation explanatory view of the air volume adjustment damper of the embodiment.

FIG. 4 is an operation explanatory view of the air volume adjustment damper of the embodiment.

FIG. 5 is an operation explanatory view that also serves as a schematic main part description of an air volume adjustment damper according to a second embodiment of the present invention.

FIG. 6 is an explanatory view of its cross-section operation.

FIG. 7 is an explanatory diagram of its installation and use state.

FIG. 8 is a perspective explanatory view of a case of being configured as a square multi-blade damper.

FIG. 9 is a schematic configuration explanatory view of a conventional damper.

[Explanation of symbols]

 10 Air Volume Adjustment Damper 12 Casing 14 Blade Body 16 Bearing 18 Rotating Shaft 20 Hole 22 Spindle Shaft 24 Spindle Shaft 26 Holding Part

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[Procedure amendment]

[Submission date] November 6, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an air volume adjusting damper according to a first embodiment of the present invention.

FIG. 2 is a plan view of the blade body of the embodiment as viewed from the front side of the flow path.

FIG. 3 is an operation explanatory view of the air volume adjustment damper of the embodiment.

FIG. 4 is an operation explanatory view of the air volume adjustment damper of the embodiment.

FIG. 5 is an operation explanatory view that also serves as a schematic main part description of an air volume adjustment damper according to a second embodiment of the present invention.

FIG. 6 is an explanatory view of its cross-section operation.

FIG. 7 is an explanatory diagram of its installation and use state.

FIG. 8 is a perspective explanatory view of a case where a rectangular blade damper is used.

FIG. 9 is a schematic explanatory view showing an installation state of an air volume adjustment damper of the embodiment.

FIG. 10 is a schematic cross-sectional explanatory view of a conventional air volume adjustment damper.

[Explanation of Codes] 10 Air Volume Adjustment Damper 12 Casing 14 Blade Body 16 Bearing 18 Rotating Shaft 20 Hole 22 Support Shaft 24 Support Shaft 26 Holding Part

Claims (1)

[Claims] 1. A casing having a wind passage formed therein, and a blade body rotatably supported in the casing for opening and closing the passage, the blade body having a plurality of holes. An air volume adjustment damper that is perforated.