JPS5891988A - Slide damper device with manual unit - Google Patents

Abstract

PURPOSE:To prevent a slide damper device from becoming incapable of being opened or closed when a drive unit fails by providing a clutch unit capable of switching to a manual operation on a drive shaft applying a torque to screw axes screwed with a girder. CONSTITUTION:Screw threads are formed on screw axes 8a, 8b, which are screwed with a nut 12 in a girder 6. Gear boxes 11a, 11b moving in conjunction with the screw axes are provided on both ends of a horizontal portion 15 and a drive shaft 17 is inserted between them. The torque of a motor 19 is transmitted to a drive shaft 17 through a gear box 40. When a clutch unit 20 which switches the rotation of this drive shaft 17 to an automatic or manual operation if turned to the manual side, the drive shaft 17 can be rotated by turning a drive unit rotating handle 42, thereby a slide damper device can be prevented from becoming incapable of being opened or closed when the drive unit fails.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slide damper device, and more particularly to a slide damper device that allows a damper blade to be raised and lowered manually in the event that the device for raising and lowering the damper blade is out of order.

There are various types of damper devices, but slide dampers have a high sealing performance when fully closed, so this type of damper is often used when the duct needs to be fully closed. .

However, in a thermal power plant, for example, as the boiler becomes larger, the exhaust gas duct also becomes larger, and simply increasing the size of the conventional slide damper will not be able to fully demonstrate its function. Particularly in the case of gas turbine power generation, a method is adopted in which the turbine exhaust is supplied to a waste heat boiler to generate steam. For this purpose, the exhaust from multiple turbines is guided through a duct to the waste heat boiler. There is. Normally the gas turbine starts up.

Because shutdowns can be performed quickly, startups and shutdowns are often performed in response to electricity demand. It is necessary to prevent exhaust gas from flowing into the turbine side of □. For this reason, the damper is frequently opened and closed, and the exhaust gas duct is often a large-mouthed duct measuring 6 m or more in length and width, so there is a need to develop a damper that is large and has excellent operability and sealing performance. has been done.

In the case of such large dampers, a special drive device such as an electric motor is required to open and close the damper, but with conventional drive systems, if the drive device fails, it is impossible to open and close the damper manually. there were.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a damper device in which even if the damper device is large, the damper can be opened and closed manually if the drive device fails.

In short, this invention arranges a clutch device on the drive shaft that provides rotational force to the helical shaft screwed into the girder, and when the drive device malfunctions, the clutch device is switched manually and the drive shaft is controlled by a handle provided on the device. It is configured to rotate.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a damper device main body, and 2 is a blade support frame forming the lower part of the damper device main body. The blade support frame 2 has a size (not shown) that is approximately the same as the outer diameter of the duct (not shown).
For example, the damper blade 3 is formed to have a side length of about 6 m), and the damper blade 3 that moves up and down along the support frame 2 is airtightly arranged with respect to the duct so as to be perpendicular to the gas flow inside the duct.

The lower part of the damper blade 3 is connected to guide rods 5a, 5b via the support plate 4, and the upper end parts of the guide rods 5a, 5b are connected to a horizontally extending girder 6. In this case, if the upper edge of the damper blade is also connected to the girder 6 by the support plate 7, shaking of the blade 3 can be prevented when the damper blade is moved up and down. 8'a and 8b are helical shafts, whose lower ends are rotatably supported by lower bearings 9a and 9b, and whose upper ends are connected to gear boxes lla and llb. The helical shafts 8a and 8b are threaded over almost the entire length.
It is screwed into a nut 12 fixed within the girder 6. Next, reference numeral 13 denotes an upper frame body which is an upper structure of the damper device main body 1, and the gear boxes lla and llb described above are placed on the horizontal portion 15 of this upper frame body 13.

FIG. 2 shows a plane of the horizontal part, and gear boxes lla and llb are arranged at both ends of the horizontal part 15, and a drive shaft 17 is inserted between them. 19 is a motor, and the rotational force of the motor 19 is transmitted to the drive shaft 17 via a gear box 40.
is transmitted to. 20 is a clutch device, and the drive shaft 17
The rotation can be switched between automatic and manual. FIG. 3 shows the details of the clutch device. Reference numeral 41 is a switching lever, which can be operated, for example, by tilting it in the X direction for automatic operation, and by tilting it in the Y direction for manual operation. Reference numeral 42 denotes a handle for rotating the drive device, and in the case of manual operation, rotating the handle 42 rotates the drive shaft 17. In addition, the reference numeral 16 in the figure is a coupling, and the reference numeral 43 is a bearing.

In the above device, when raising the damper blade 3, the rotational force of the motor 190 is transmitted to the drive shaft 17 via the clutch device 2o. The rotational force of the drive shaft 17 is further transmitted to each helical shaft 8a, 8 in the gearboxes lla, llb.
b, and raises the girder 6 via the nut 1z which is threadedly engaged with the helical shafts 8a and 13b. The guide roller 23 provided at the upper end of the girder 6 is connected to the guide rails 24, 2.
5.26 to raise the girder 6 accurately. Note that 27 is a guide roller provided on the upper frame. Since the damper blade 3 is connected to the girder 6 by the guide rod 5a5b, it rises together with the girder until the blade support frame 2 is completely opened. If the motor 19 fails or there is a power outage during this time, the lever 41 of the clutch device 20 is switched to manual mode, and the handle 42 is then rotated to rotate the drive shaft 17. In this case, since the helical shafts 8a and 8b are screwed together with the screws 12 in a bolt-nut relationship, the drive shaft 17 does not have a very high torque and can be easily rotated by hand. The damper blade doctor completely rises outside the blade support frame 2, and the damper is fully opened.

Next, when closing the damper, the damper blade 3 is lowered by an operation opposite to that described above, and all four corners of the damper blade 3 including the lower edge of the blade are supported by the support frame 2, and the damper blade 3 is fully closed.

By carrying out this invention, even in a large damper device, if the drive device for raising and lowering the damper fails, the damper blade can be immediately raised and lowered manually, so there is no risk of disruption to the gas passage system.

[Brief explanation of the drawing]

FIG. 1 is a front view of a slide damper device according to the present invention;
FIG. 2 is a plan view of the horizontal portion of the upper frame, and FIG. 3 is a side view of the clutch device. 3.7 Damper blade 6 Girder 8a, 8b Spiral shaft 17 Drive shaft 2o Clutch device Fig. 1 Figure 2

Claims (1)

[Scope of Claims] 1. A damper blade is raised and lowered by transmitting the rotational force of a drive shaft to a helical shaft and raising a girder which is threadedly engaged with this helical shaft and connected to a damper blade, in which the damper blade is raised and lowered by A slide damper device equipped with a manual device, characterized in that it is equipped with a latch device that can switch between automatic and manual switching. 2. The clutch device is equipped with a manual-to-automatic switching lever and a handle. A slide damper device equipped with a manual device according to claim 1, wherein the drive shaft is rotated by rotating the lever.