JPS604019Y2 - flow control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a flow rate control device for a fluid passageway, and more particularly to a device for controlling the flow rate using a damper (adjusting plate) for a duct.

Fluid flow channels such as heating and cooling ducts and exhaust ducts are equipped with flow rate control devices to adjust the flow rate of the fluid and to shut off flames, smoke, etc. passing through the flow channels in the event of a fire. , a plurality of adjustment plates are rotatably provided so that their edges overlap, and upper and lower and left and right backing plates are provided in the shape of a square frame on the inner surface of the channel, and the edges of the adjustment plates are brought into contact with the backing plates. The flow rate is controlled by blocking the fluid flow path or changing the inclination of the adjustment plate to adjust the flow area.

By the way, as shown in FIG. 4, in the conventional flow rate control device, the adjustment plate 2 is composed of a single flat plate with the rotating shaft 1 fixed on the center line, so the edge of the adjustment plate 2 is The contact plates 3 are provided in a staggered manner on the inner surface of the fluid flow path.

However, with this type of equipment, the amount of air leakage when the flow path is shut off becomes a problem, and in particular, the amount of air leakage when the smoke exhaust duct is shut off is specified by government ordinance. Since the backing plates 3 are attached, skill is required to accurately place all the backing plates 3 in the predetermined positions.
Often, the backing plate 3 is not provided at a predetermined position, resulting in problems such as insufficient shutoff of fluid.

Furthermore, as the number of missing parts of the backing plate (part (A) in FIG. 4) increases, the area that must be blocked increases, leading to a reduction in the blocking rate.

In the case of FIG. 4, there are three locations on the patch plate 3. This idea is
A single plate can be easily and accurately formed into concave and convex areas by press processing.
Focusing on the fact that the uneven parts can be shaped, we designed the adjusting plate, which is normally made from a single plate by press working, to have unevenness on both sides of the rotating shaft, and made it possible to use a straight strip plate as the backing plate. The present invention aims to provide a flow control device in which the number of missing parts of the backing plate is reduced and workability and shutoff rate are improved.

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

1 to 3, 10 is a duct with a square cylindrical cross section, and 11 is a square cylindrical connecting tube that connects the ends of the ducts 10 on both sides. Flow path A is formed.

As shown in FIG. 2, upper and lower and left and right backing plates 12 and 13 are fixed to the inner surface of the connecting tube 11 in the shape of a square frame, and cutouts 14 are formed in the upper and lower backing plates 2 at predetermined intervals. .

As shown in FIG. 1, a rotating shaft 15 rotatable from the outside of the connecting tube 11 is provided in the flow path A corresponding to each notch 14. As shown in FIG.

An adjusting plate 16 is fixed to both rotating shafts 15 along the axial direction, and this adjusting plate 16 has a bent part 17 in a U-shaped cross section in the center line direction at the center thereof. The adjusting plate 16 is attached to the rotating shaft 15 by fitting the rotating shaft 15 into the rotating shaft 15 and welding the fixed plate 18 to the rotating shaft 15.

The adjustment plate 16 is divided into rectangular blade plates 16a and 16b facing oppositely each other by a bent portion 17, and one of the blade plates 16
The upper and lower edges of a (front and rear edges in Fig. 1) are the upper and lower edges of the plate 12.
The other wing plate 16b passes through the notch 14 and is applied to the opposite side of the plate 12 from above and below.

That is, the blade plates 16a, 16b are staggered with the backing plate 12 in between, as shown in FIG.

Furthermore, at least one of the opposing edges of the adjacent blade plates 16a and 16b has a stepped portion 19 that is depressed toward the other side by the thickness of the backing plate 13, excluding the upper and lower contact portions with the plate 12. (In the embodiment, both have stepped portions).

Further, the left edge of the leftmost wing plate 16a (the uppermost edge in FIG. 1) contacts the left abutment plate 13, and the right edge of the rightmost wing plate 16b (the lowermost edge in FIG. 1) abuts the right abutment plate 13. It comes into contact with the plate 13.

In addition, in the embodiment, an example was shown in which the flow rate was controlled using two adjustment plates, but the number of adjustment plates may be selected as appropriate.

The embodiment is configured as described above, and this duct 10
is used as a smoke exhaust duct, and if a fire breaks out,
The detection signal causes the rotating shaft 15 to be rotated by a motor or the like, and as shown in FIG. Become.

In this state, since the plates 12 above and below the overlapping portion of the adjusting plates 16 are not removed, the removed portions are smaller than in the conventional case (the one shown in FIG. 4), and the blocking rate is high.

It should be noted that "vertical direction" in the above embodiments and the claims of the utility model registration does not mean only the vertical direction, but may also mean the horizontal direction depending on the installation state of the device.

As described above, according to the flow rate control device of this invention, upper and lower and left and right backing plates of a predetermined width are fixed to the inner surface of a fluid flow path having a rectangular cross section in the shape of a square frame, and The adjustment plate has a notch shape, a vertical rotation axis that can be rotated from outside the flow path corresponding to each notch, and rectangular blade plates facing oppositely on both sides of the U-shaped bent part in cross section. Fit and fix the bent part to each rotating shaft, and attach the adjusting plate to each rotating shaft by welding the fixing plate from the opposite side to the adjusting plate at the bent part from the opposite side of the rotating shaft. The upper and lower edges of the wing plate touch one side of the plate in the upper and lower directions, and the upper and lower edges of the other wing plate pass through the notches and touch the other surface on the opposite side of the plate in the upper and lower directions. The left edge of the plate is in contact with the left abutment plate, the right edge of the rightmost wing plate is in contact with the right abutment plate, and one of the opposing edges of the adjacent wing plate is in contact with the upper and lower abutment plates. Since the structure is such that the top and bottom, excluding the contact area, are stepped down to the other side by the thickness of the plate, each backing plate can be constructed from a single plate.
Positioning becomes easy and accurate, and the caul plate can be easily and accurately provided in a fixed position.

Furthermore, the steps and U-shaped bent portions of the vanes on both sides of the adjustment plate can also be accurately obtained by press working.

Therefore, the backing plate can be accurately provided in a fixed position, and the shape of the adjustment plate can also be accurately shaped, so that the joint surfaces of the two fit together perfectly, and the shielding rate is improved compared to the conventional one.

Further, when obtaining the same shielding rate, the work of welding each caul plate to a predetermined position is complicated in the conventional method, so the workability of the method of the present invention is much better.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional plan view of the flow control device of this invention, Figure 2 is a left side view of Figure 1 with the adjustment plate etc. removed, and Figure 3 is the
FIG. 4 is a perspective view of the main part of the figure, and FIG. 4 is a schematic diagram of a conventional flow rate control device. 10...Duct, 11...Connection pipe, 1
2... Upper and lower backing plates, 13... Left and right backing plates, 14... Notches, 15... Rotating shaft,
16...adjustment plate, 16a, 16b...
Vane plate, A...Fluid flow path.

Claims (1)

[Scope of utility model registration request] Upper and lower and left and right backing plates 12 and 13 of a predetermined width are fixed in the shape of a square frame to the inner surface of the fluid flow path A having a square cross section, and the upper and lower backing plates 1
2 has notches 14 formed at predetermined intervals, and a vertical rotation shaft 15 that can be rotated from outside the flow path is provided corresponding to each notch 14.
Each rotating shaft 15 has an adjustment plate 16 with rectangular vanes 16a and 16b facing oppositely on both sides of a U-shaped bent portion 17.
At the same time, the fixing plate 18 is welded to the adjusting plate 16 at the bent part from the opposite side around the rotating shaft 15, so that the adjusting plate 1 is attached to each rotating shaft 15.
6 is attached, the upper and lower edges of one wing plate 16a of the adjustment plate 16 are in contact with one surface of the upper and lower backing plates 12, and the other wing plate 16
The upper and lower edges of b pass through the notch 14 and come into contact with the other surface on the opposite side of the upper and lower backing plates 12, and furthermore, the left edge of the leftmost wing plate 16a abuts on the left backing plate 13, and the rightmost wing The right edge of the plate 16b is in contact with the right abutment plate 13, and one of the opposing edges of the adjacent wing plates 16a, 16b is abutted by the thickness of the upper and lower abutment plates, excluding the contact portion with the upper and lower abutment plates 12. A flow control device characterized by having a stepped portion that is depressed toward the other side.