JP6949325B2 - Exhaust damper - Google Patents

Description

The present invention relates to an exhaust damper that opens and closes an exhaust port of a high temperature exhaust such as a gas turbine exhaust.

A gas turbine power generation device using a gas turbine engine as a drive source is generally used as an emergency power generation device in which a commercial power source cannot be used due to an earthquake or a typhoon (for example, Patent Document 1).

The partition wall of the power generation device room in which the gas turbine power generation device as described above is installed is usually provided with an intake port and an exhaust port for performing intake and exhaust necessary for the operation of the gas turbine engine.

Japanese Unexamined Patent Publication No. 2009-275624

In an emergency such as an earthquake or typhoon, it is expected that a fire will occur inside the power generator room. In that case, in order to prevent the spread of fire from the intake / exhaust port to the outside, it is considered effective to provide a damper that opens and closes the intake / exhaust port so that the damper is closed in the event of a fire. However, the exhaust from the gas turbine engine reaches a high temperature of, for example, about 600 to 700 °. For this reason, the components of the exhaust damper that are constantly exposed to the exhaust of the gas turbine engine are thermally expanded, which may hinder the opening / closing operation and the airtightness when the gas turbine engine is closed.

Therefore, an object of the present invention is to provide an exhaust damper that can be used for a long period of time even in an environment exposed to high temperature exhaust in order to solve the above problems.

In order to achieve the above-mentioned object, the exhaust damper according to the present invention is
With the frame where the inner opening forms the exhaust passage,
A damper blade fixed to the rotating shaft and having a shape capable of closing the opening of the frame,
With
A clearance is formed between both ends of the damper blades in the axial direction and the inner portions of the frame facing the both ends.
In addition, in this specification, "closed" means not only when the opening of the frame is physically completely closed, but also it is possible to secure a substantial seal between the frame and the damper blades with respect to the exhaust gas. Including the case where there is a certain degree of gap.

According to this configuration, the clearance formed between the damper blade and the inner portion, which is the portion closest to the damper blade on the frame side, absorbs the heat elongation in the axial direction of the damper blade, so that the temperature is high. The exhaust damper can be operated stably for a long period of time even in an environment exposed to exhaust gas.

In one embodiment of the present invention, a bearing that rotatably supports the rotating shaft of the damper blade to the frame at both ends thereof is provided, and one end of the rotating shaft is slid in the axial direction by the bearing. It may be movably supported. According to this configuration, the thermal elongation of the rotating shaft that rotates the damper blade can be absorbed by the sliding of the bearing.

In one embodiment of the present invention, a slit may be formed in a reinforcing member attached to at least a portion of the inner surface of the frame through which the rotation shaft is inserted. When the exhaust dampers include a plurality of the damper blades arranged in parallel with each other, the reinforcing member extends over a portion of the inner surface of the frame through which the rotation shafts of the plurality of the damper blades are inserted. The slits may be formed at each position between the adjacent damper blades in the reinforcing member. According to this configuration, the heat elongation of the reinforcing member attached to the inner side surface of the frame is absorbed by the slit, and the member can be prevented from being deformed by the thermal elongation and coming into contact with the damper blades.

As described above, according to the exhaust damper according to the present invention, since it has a structure capable of absorbing heat elongation, it can be used for a long period of time even in an environment exposed to high temperature exhaust gas.

It is the schematic which shows the gas turbine power generation facility F to which the exhaust damper which concerns on one Embodiment of this invention is applied. It is a front view which shows the schematic structure of the exhaust damper of FIG. It is a side view which shows the exhaust damper of FIG. It is sectional drawing along the IV-IV line of FIG. It is sectional drawing along the VV line of FIG.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings, but the present invention is not limited to this embodiment.

FIG. 1 shows a schematic configuration of a gas turbine power generation facility F, which is an example of a facility to which the exhaust damper 1 according to the embodiment of the present invention is applied. The gas turbine power generation facility F is a facility that generates power by driving a generator 5 with a gas turbine 3, and is used as an emergency power source for which a commercial power source cannot be used due to, for example, an earthquake or a typhoon. In the power generation chamber 7 in which the gas turbine power generation facility F is installed, an exhaust port 9 for discharging the high-temperature exhaust gas discharged from the gas turbine 3 to the outside is formed. The temperature of the exhaust gas G from the gas turbine 3 at the position of the exhaust port 9 is, for example, about 600 ° C. to 700 ° C.

An exhaust damper 1 is attached to the exhaust port 9. The exhaust damper 1 is opened in normal times to allow high-temperature exhaust G to pass through, and is closed in order to prevent the spread of fire when an abnormality such as a fire occurs in the power generation chamber 7. In the illustrated example, in the power generation chamber 7, the air supply port 11 for taking in the air introduced into the gas turbine 3 as the working medium and the cooling air from the outside and the air after cooling the inside of the gas turbine 3 are externally introduced. A ventilation port 13 is provided for discharging the air to the air supply port 13, and an air supply damper 15 and a ventilation damper 17 that can be opened and closed are attached to the air supply port 11 and the ventilation port 13, respectively.

As shown in FIG. 2, the exhaust damper 1 includes a frame 21 and damper blades 25 fixed to a rotating shaft 23. The opening inside the frame 21 forms an exhaust passage. In this embodiment, the frame 21 is formed in a rectangular shape. Further, the exhaust damper 1 includes a plurality of (four in this example) damper blades 25 arranged in parallel with each other. In this example, each damper blade 25 is arranged so as to extend in the horizontal direction.

A flange 27 for attaching the exhaust damper 1 to the exhaust port 9 (FIG. 1) is provided on the outer periphery of the frame 21 over the entire frame 21. As shown in FIG. 3, the flanges 27 are provided in two rows so as to sandwich the partition wall of the power generation chamber 7.

As shown in FIG. 4, the damper blade 25 is a substantially flat member as a whole, and its central portion 25a is fixed to the rotation shaft 23. In the illustrated example, a recess is formed in the central portion 25a of the damper blade 25, and the rotation shaft 23 is fitted in the recess. However, the mode in which the damper blade 25 is attached to the rotating shaft 23 is not limited to this example.

The damper blade 25 has a shape capable of closing the opening of the frame 21. That is, in the illustrated example, the four damper blades 25 have a shape capable of closing the rectangular opening 21a (FIG. 2) of the frame 21. Reinforcing ribs 29 are projected from one surface of the damper blades 25. The reinforcing rib 29 is formed in a plate shape. In the present embodiment, the reinforcing rib 29 extends in a direction orthogonal to the longitudinal direction of the damper blade 25. Further, as shown in FIG. 2, a plurality of reinforcing ribs 29 are provided at equal intervals (four in the illustrated example) in the longitudinal direction of the damper blades 25. By providing the reinforcing rib 29, thermal deformation due to exposure of the damper blade 25 to high-temperature exhaust gas is suppressed. The mode of the reinforcing rib 29 is not limited to this example, and may be provided on both sides of the damper blade 25, for example. Further, the reinforcing rib 29 may be omitted.

The rotating shafts 23 of the damper blades 25 are rotatably supported by the frame 21 by bearings 31 at both end portions 23a and 23a. Hereinafter, for convenience of explanation, the left end portion of the rotation shaft 23 in the drawing may be referred to as a first end portion 23aA, and the right end portion may be referred to as a second end portion 23aB for distinction. Similarly, the bearing 31 that supports the first end of the rotating shaft 23 may be referred to as the first bearing 31A, and the bearing 31 that supports the second end may be referred to as the second bearing 31B.

As shown in FIG. 5, in the present embodiment, each bearing 31 is supported on the outer surface 21b of the frame 21 via a bearing support 33. That is, the bearing support 33 is fixed to the outer surface 21b of the frame 21, and the bearing 31 is attached to the outer surface 33a of the bearing support 33. In the illustrated example, the bearing support 33 is fixed to the frame 21 by fixing bolts 35 and nuts 37. The rotation shaft 23 extends to the bearing 31 through the first rotation shaft insertion hole 39 of the frame 21 and the second rotation shaft insertion hole 41 of the bearing support 33.

Reinforcing members 43 extending along the inner side surfaces 21c are attached to both inner side surfaces 21c and 21c of the frame 21. In this example, the reinforcing member 43 is attached to the frame 21 by welding. The reinforcing member 43 is provided on the inner side surface 21c of the frame 21 at least at a portion through which the rotating shaft 23 is inserted. In the illustrated example, the reinforcing member 43 is provided over the portion of the inner side surface 21c of the frame 21 through which the rotation shafts 23 of the plurality of damper blades 25 are inserted. The rotation shaft 23 is inserted into the third rotation shaft insertion hole 45 formed in the reinforcing member 43. The reinforcing member 43 reinforces the mechanical strength of the portion of the frame 21 through which the rotating shaft 23 is inserted. Further, the reinforcing member 43 allows the damper blade 25 and the frame 21 to be in a closed state while avoiding interference between the tip of the fixing bolt 35 protruding toward the inner side surface 21c side of the frame 21 and the damper blade 25. A substantial seal between them is ensured.

The damper blades 25 of the exhaust damper 1 configured in this way connect the rotation shafts 23 of all the damper blades 25 by a common connecting member 49 via the respective connecting pieces 47, for example, as shown in FIG. Then, by driving any one of the rotation shafts 23 by the drive device 51 shown in FIG. 1, the rotation shafts 23 can be opened and closed at the same time. In this embodiment, a DC type electric motor is used as the drive device 51 in consideration of the fact that the exhaust damper 1 is used for the emergency power generation facility F. However, the drive mechanism for opening and closing the damper blade 25 is not limited to this example.

As shown in FIG. 5, in the present embodiment, a clearance C is formed between both ends 25b and 25b of the damper blade 25 in the axial direction and the inner portion 21d of the frame 21 facing the both ends 25b and 25b. There is. The "inner portion 21d of the frame 21" in the present specification refers to a portion of the frame 21 or a member attached to the frame 21 facing both ends 25b and 25b of the damper blade 25. In the illustrated example, the portion of the reinforcing member 43, which is a member attached to the inner side surface 21c of the frame 21, facing both ends 25b and 25b of the damper blade 25 is the “inner portion 21d of the frame 21”. If a member such as a reinforcing member 43 is not attached to the inner side surface 21c of the frame 21, the portion of the inner side surface 21c of the frame 21 facing both ends 25b and 25b of the damper blade 25 is "the frame 21. Inner portion 21d ". The clearance C is not merely a gap for avoiding interference between the damper blade 25 and the inner portion 21d, but has a size capable of absorbing the thermal elongation of the damper blade 25 caused by high-temperature exhaust, and also exhausts. When the damper 1 is closed, the size is set so that the passage of exhaust gas is substantially obstructed.

It is not essential to attach the reinforcing member 43 to the inner side surface 21c of the frame 21. Further, a member having another function such as a member for supporting the bearing 31 may be attached to the inner side surface 21c of the frame 21, and this may also be used as the reinforcing member 43. In either case, a clearance C is formed between the inner portion 21d of the frame 21 and the damper blade 25, which are the portions on the frame 21 side closest to both ends 25b and 25b of the damper blade 25.

Further, in the present embodiment, one end (second end) 23aB of the rotating shaft 23 is slidably supported in the axial direction by the second bearing 31B. The other end (first end) 23aA of the rotating shaft 23 is supported by the first bearing 31A in a state where the axial position is fixed. In this example, the second end 23aB side of the rotating shaft 23, which is the end opposite to the end connected to the drive device 51, is slidably supported. As the first bearing 31A that slidably supports the first end portion of the rotating shaft 23, for example, a slide bearing using a solid lubricant can be used. However, the first bearing 31A is not limited to this, and may be a rolling bearing.

Further, as shown in FIG. 4, a slit 53 is formed in a reinforcing member 43 which is a member attached to the inner side surface 21c of the frame 21. In other words, the reinforcing member 43 is divided into a plurality of portions via the slit 53. In the illustrated example, slits 53 are formed at each position between the adjacent damper blades 25 in the reinforcing member 43. More specifically, the slit 53 is formed in the reinforcing member 43 at a position corresponding to an intermediate point between the axes of the adjacent rotating shafts 23.

As described above, by forming the slit 53 in the reinforcing member 43 to absorb the thermal elongation of the reinforcing member 43, it is possible to prevent the reinforcing member 43 from being deformed by the thermal elongation and coming into contact with the damper blade 25. can. In particular, by forming slits 53 at each position between the adjacent damper blades 25 in the reinforcing member 43, the reinforcing member 43 heat-extends substantially evenly around the position corresponding to each damper blade 25, so that the reinforcing member 43 is reinforced. The displacement of the insertion hole of the rotation shaft 23 of the member 43 is suppressed. However, the position of forming the slit 53 in the reinforcing member 43 is not limited to this example.

According to the exhaust damper 1 according to the present embodiment described above, the clearance C formed between the damper blade 25 and the inner portion 21d of the frame 21 which is the portion closest to the damper blade 25 on the frame 21 side. , The heat elongation in the axial direction of the damper blade 25 is absorbed. As a result, the exhaust damper 1 can be stably operated for a long period of time even in an environment exposed to high-temperature exhaust.

In the present embodiment, an example in which the exhaust damper 1 is applied to the gas turbine power generation facility F has been described, but the exhaust damper 1 according to the present invention can also be applied to other applications exposed to high-temperature exhaust. ..

As described above, the preferred embodiment of the present invention has been described with reference to the drawings, but various additions, changes or deletions can be made without departing from the spirit of the present invention. Therefore, such things are also included within the scope of the present invention.

1 Exhaust damper 21 Frame 21c Inner side surface of frame 21d Inner part of frame 23 Rotating shaft 25 Damper blade 31 Bearing 43 Reinforcing member 53 Slit C Clearance

Claims (2)

With the frame where the inner opening forms the exhaust passage,
A plurality of damper blades arranged in parallel with each other, which are fixed to a rotating shaft and have a shape capable of closing the opening of the frame, and
With
A clearance is formed between both ends of the damper blade in the axial direction and the inner portion of the frame facing the both ends .
A slit is formed in a reinforcing member attached to at least a portion of the inner surface of the frame through which the rotation shaft is inserted.
The reinforcing member is provided on the inner surface of the frame over a portion through which the rotation shafts of the plurality of damper blades are inserted.
The slits are formed at each position between the adjacent damper blades in the reinforcing member.
Exhaust damper. The exhaust damper according to claim 1 further includes bearings that rotatably support the rotating shafts of the damper blades on the frame at both ends thereof, and one end of the rotating shaft is axially oriented by the bearings. Exhaust damper that is slidably supported.

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