JPH053885Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a flow rate regulating device provided in a duct, for example, a flow rate regulating device for regulating the amount of air supplied to a boiler.

[Conventional technology]

FIG. 4 is a schematic diagram showing a conventional flow rate adjusting device. In the figure, 5 is a duct through which fluid flows, 4 is a damper shaft attached to the duct 5, and 3 is a damper blade attached to the damper shaft 4.
and the damper blade 3 constitute a damper 8. 6
is an air oil type flow rate detector installed in the duct 5, and the flow rate detector 6 is installed on the downstream side of the damper 8, and the damper 8 and the flow rate detector 6 are separated by approximately the diameter of the duct 5. ing.

In this flow rate adjustment device, the damper 8 can adjust the flow rate of the fluid flowing inside the duct 5, and the flow rate detector 6 can detect the flow rate of the fluid flowing inside the duct 5.

[The problem that the idea aims to solve]

However, in such a flow regulating device,
As shown in FIG. 4, the flow on the downstream side of the damper 8 concentrates in the center, and the flow rate detector 6 receives a large dynamic pressure, and as shown by the solid line in FIG. The detected value may be larger than the actual flow rate, or as shown in Figure 5, the damper 8
A large eddy current may occur in the downstream flow, and the flow rate detected by the flow rate detector 6 may become smaller than the actual flow rate, as shown by the broken line in FIG.

This invention was made in order to solve the above-mentioned problem, and its purpose is to provide a flow rate adjustment device in which the flow after the damper becomes uniform.

[Means to solve the problem]

In order to achieve this object, in this invention, in a flow rate regulating device having a damper in a duct through which fluid flows, a damper shaft of the damper and a damper shaft of the fluid are located at a position close to the damper on the downstream side of the damper. Provide a partition plate parallel to the flow direction.

[Effect]

In this flow rate adjustment device, the flow on the downstream side of the damper is rectified by the partition plate.

〔Example〕

FIG. 1 is a schematic diagram showing a flow rate adjustment device according to the invention, and FIG. 2 is a perspective view showing a part of the flow rate adjustment device shown in FIG. 1. In the figure, 1 is a partition plate provided on the downstream side of the damper shaft 4. The partition plate 1 is provided in contact with the damper shaft 4, and the partition plate 1 prevents the damper blade 3 from fully opening. The damper shaft 4 is provided at a different position, that is, offset from the center of the damper shaft 4. 2 is a partition plate provided on the downstream side between the two dampers 8, and the partition plate 2 is provided in a position that does not prevent the damper blades 3 from opening and closing.The lengths of the partition plates 1 and 2 are as follows. It is 1 to 1.5 times the width of the damper blade 3.

In this flow rate adjustment device, the flow on the downstream side of the damper 8 is rectified by the partition plates 1 and 2.
It is possible to prevent the flow on the downstream side of the damper 8 from concentrating in the center and to prevent large vortices from occurring, and as shown in FIG. 7, the flow on the downstream side of the damper 8 becomes uniform. Even when the distance between the damper 8 and the flow rate detector 6 is less than twice the diameter of the duct 5,
As shown by the solid line in Figure 9, the opening degree of the damper 8 is approximately
The flow rate detected by the flow rate detector 6 when the temperature is 15 degrees or higher is accurate. Furthermore, since the resistance of the rectifier plates 1 and 2 is small, there is little pressure loss, so less power is required. Furthermore, since the partition plate 1 is provided in contact with the damper shaft 4, fluid can be prevented from flowing between the partition plate 1 and the damper shaft 4.

FIG. 3 is a schematic diagram showing another flow rate regulating device according to this invention. In the figure, 7 is a perforated plate provided in the duct 5, and the perforated plate 7 is provided between the partition plates 1 and 2 and the flow rate detector 6.

In this flow rate regulating device, the flow on the downstream side of the damper 8 is rectified by the partition plates 1 and 2, and the flow on the downstream side of the partition plates 1 and 2 is rectified by the perforated plate 7. As shown in the figure, the flow on the downstream side of the damper 8 is extremely uniform, so even when the distance between the damper 8 and the flow rate detector 6 is less than twice the diameter of the duct 5, the dashed line in FIG. As shown in the figure, the flow rate detected by the flow rate detector 6 is accurate when the opening degree of the damper 8 is approximately 5 degrees or more.

In the above embodiment, the partition plate 1 was provided on the downstream side of the damper shaft 4, and the partition plate 2 was provided on the downstream side between the two dampers 8, but it is also possible to provide the partition plate at other positions. Good too. Further, in the above embodiment, the partition plate 1 was provided in contact with the damper shaft 4, but the partition plate 1
may be provided apart from the damper shaft 4; in this case, when the width of the damper blade 3 is 200 mm or more, it is desirable that the distance between the partition plate 1 and the damper shaft 4 be 10 mm or less. Further, in the above embodiment, the length of the partition plates 1 and 2 was set to 1 to 1.5 times the width of the damper blade 3, but the lengths of the partition plates 1 and 2 are not limited to this. If the length of 2 is made longer than this,
The rectification effect can be further enhanced. Also, the third
In the embodiment shown in the figure, a perforated plate 7 is provided, but other rectifying elements may be provided in place of the perforated plate 7.

[Effect of idea]

As explained above, in the flow regulating device according to the present invention, the flow on the downstream side of the damper is rectified by the partition plate, so that the flow on the downstream side of the damper becomes uniform. In this way, the effects of this invention are remarkable.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a flow rate adjustment device according to this invention, FIG. 2 is a perspective view showing a part of the flow rate adjustment device shown in FIG. 1, and FIG. 3 is another flow rate adjustment device according to this invention. FIG. 4 is a schematic diagram showing a conventional flow rate adjustment device, FIG. 5 is an explanatory diagram of the operation of the flow rate adjustment device shown in FIG. 4, and FIG. 6 is a flow rate adjustment device shown in FIG. 4. Figure 7 is a graph showing the relationship between the damper opening degree and the flow rate detection error of the flow rate detector.
, an explanatory diagram of the operation of the flow rate adjustment device shown in FIG. 2,
Fig. 8 is an explanatory diagram of the operation of the flow rate adjustment device shown in Fig. 3, and Fig. 9 shows the damper opening degree of the flow rate adjustment device shown in Figs. It is a graph showing a relationship with a flow rate detection error of a flow rate detector. 1, 2... Partition plate, 3... Damper blade, 4...
Damper shaft, 5... duct, 8... damper.

Claims (1)

[Scope of utility model registration request] In a flow rate regulating device having a damper in a duct through which fluid flows, a partition plate is provided in a position downstream of the damper and close to the damper, parallel to the damper axis of the damper and the flow direction of the fluid. Characteristic flow adjustment device.