JPS63210551A - Air flow rate adjusting damper - Google Patents

Abstract

PURPOSE:To obtain a damper having little disturbance of an airstream on the downstream of the damper by forming the vane for adjusting the air flow rate. CONSTITUTION:A movable vane 22 for adjusting an air flow rate is axially supported by a shaft 24 within a casing 20 interposed at a part of an airstream path. The movable vane 22 is provided with a large number of holes 26 over its entire surface. The shaft 24 is rotated by a link mechanism, a rotational mechanism or the like, whereby the angle of the movable vane 22 with respect to the air stream is varied thereby to adjust the air flow rate. While a part of an airstream A passes between movable vanes, the other part thereof flows via the hole 26 formed in the movable vane 22. Accordingly, since a drift occurring when passing through the damper is reduced and the rate of acceleration of the air stream flowing between the movable vanes 22 is reduced, the generation of a turbulent flow in the downstream C of the damper is suppressed. The diameter and number of the hole 26 are set suitably depending on the condition of use. However, this damper can afford a smoothing effect on the air stream by the provision of the hole 26.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a damper for adjusting air volume, and more specifically to this type of damper that suppresses the generation of turbulent flow downstream of the damper.

[Prior Art] In general, a damper for adjusting air volume includes a casing lO and one or more movable blades 12 for adjusting air volume attached to the casing lO, as shown in FIG. The air volume can be adjusted by changing the angle.

The conventional movable vane 12 used in this type of damper is formed from a plate material such as an iron plate, and when the air volume is adjusted by changing the angle of the movable vane 12 made of such a plate material, the third The air flow shown by arrow A in the figure is accelerated while passing between the blades 12 from the upstream side B, and these accelerated flows flowing out from between the blades 12 collide with each other, resulting in significant air flow at the downstream side C of the damper. The flow becomes turbulent.

[Problems to be Solved by the Invention] The air volume is measured downstream of the damper, but with the conventional damper for adjusting air volume, the air flow is significantly disturbed downstream of the damper, so the air volume cannot be measured in the immediate vicinity. In order to perform highly accurate measurements, there is a drawback that the length of the straight pipe downstream of the damper must be increased.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a damper for adjusting air volume with less turbulence in the air flow downstream of the damper.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an air volume control system that includes a casing and an air volume adjustment vane that is attached to the casing and adjusts the air volume by adjusting the angle with respect to the air flow direction. In the adjusting damper, the air volume adjusting blades were formed with porous holes.

[Function] In the air volume adjusting damper of the present invention, since the air volume adjusting blades are formed with porous holes, the air flow also passes through these holes, the acceleration effect of the air flow when passing through the blades is reduced, and the turbulent flow downstream of the damper is reduced. It is possible to suppress the outbreak.

[Embodiment] FIG. 1 is a perspective view showing an air volume adjusting damper according to an embodiment of the present invention.

Reference numeral 20 denotes a casing interposed in a part of the air flow path, and inside this goo sink 20 there are movable vanes MJ for adjusting the air volume, 22 and a shaft 2.
It is pivoted on 4. The movable blade 22 has a large number of holes 26 drilled over its entire surface, and by rotating the shaft 24 by a link mechanism, a rotation mechanism, etc. (not shown), the angle of the movable blade 22 with respect to the airflow is changed, thereby adjusting the air volume. It looks like this.

Next, to explain the operation of this embodiment, as shown in FIG. and flows. Therefore, the drifting flow when passing through the damper is reduced, and the rate of acceleration of the airflow flowing between the movable vanes 22 is also reduced, so the occurrence of turbulent flow downstream of the damper C is suppressed. Note that the diameter, number, etc. of the holes 26 also provide a rectifying effect depending on the usage conditions.

[Effects of the Invention] As explained above, the air volume adjustment damper according to the present invention has the following effects:
Since the air volume adjustment vanes are formed with porous holes, there is less turbulence in the air flow downstream of the damper, and highly accurate air volume measurement can be performed even in the vicinity of the damper. There's no need to take too much.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an air volume adjustment damper according to an embodiment of the present invention, Fig. 2 is a sectional view showing the air flow state in the same embodiment, and Fig. 3 is an air flow state in a conventional air volume adjustment damper. FIG. 20... Casing 22... Vane 24... Shaft 26... Hole Applicant Hitachi Plant Construction Co., Ltd. Figure 1 2o: Casing. 22: IE7 Yang 24: #Yu 26: Ryomu Figure 2 Figure 3

Claims (1)

[Claims] (1) An air volume regulating damper comprising a casing and an air volume regulating vane installed in the casing that regulates the air volume by adjusting the angle with respect to the airflow direction, characterized in that the air volume regulating vane is formed with porous holes. A damper for adjusting air volume.