JP2019035529A - Exhaust damper - Google Patents

Abstract

To provide an exhaust damper which can be used for a long time even in an environment exposed to high-temperature exhaust air.SOLUTION: An exhaust damper (1) includes: a rectangle frame (21); and damper blades (25) which are fixed to rotary shafts (23) and have a shape that can close an opening of the frame (21). Clearances (C) are respectively formed in spaces between both ends of the damper blade (25) and an inner side part (21d) of the frame (21). One end of the rotary shaft (23) may be supported by a bearing (31) in a manner such that the one end can slide in an axial direction. Slits (53) may be formed at a reinforcement member (43) attached to an inner surface (21c) of the frame (21).SELECTED DRAWING: Figure 4

Description

  The present invention relates to an exhaust damper that opens and closes a discharge port of high-temperature exhaust such as 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 supply cannot be used due to an earthquake or a typhoon (for example, Patent Document 1).

  The partition wall of the power generator room where the gas turbine power generator 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.

JP 2009-275624 A

  In the event of an emergency such as an earthquake or typhoon, it is assumed that a fire will occur in the 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 and closes the damper when a fire occurs. However, the exhaust from the gas turbine engine reaches a high temperature of about 600 to 700 °, for example. For this reason, the components of the exhaust damper that are constantly exposed to the exhaust of the gas turbine engine are subject to thermal expansion, which may hinder the opening / closing operation and the sealing performance when the exhaust damper is closed.

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

In order to achieve the above-described object, an exhaust damper according to the present invention includes:
A frame whose inner opening forms an exhaust passage;
A damper blade fixed to a 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 blade in the axial direction and the inner portion of the frame facing the both ends.
In the present specification, “can be closed” means not only a case where the opening of the frame is physically completely closed, but also a substantial seal between the frame and the damper blade against the exhaust. This includes cases where there is a gap of a certain degree.

  According to this configuration, the thermal expansion in the axial direction of the damper blade is absorbed by the clearance formed between the damper blade and the inner portion that is the portion closest to the damper blade on the frame side. Even in an environment exposed to exhaust gas, the exhaust damper can be stably operated for a long period of time.

  In one embodiment of the present invention, the bearing further includes a bearing that rotatably supports the rotating shaft of the damper blade at the both ends thereof, 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 side surface of the frame through which the rotation shaft is inserted. When the exhaust damper includes a plurality of the damper blades arranged in parallel to 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 damper blades are inserted. The slit may be formed at each position between the adjacent damper blades in the reinforcing member. According to this configuration, the thermal expansion of the reinforcing member attached to the inner surface of the frame can be absorbed by the slit, and the member can be prevented from being deformed by the thermal expansion and coming into contact with the damper blade.

  As described above, the exhaust damper according to the present invention can be used for a long period of time even in an environment exposed to high-temperature exhaust by having a structure capable of absorbing thermal elongation.

It is a schematic diagram showing gas turbine power generation equipment F to which an exhaust damper concerning one embodiment of the present invention is applied. It is a front view which shows 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. However, the present invention is not limited to the embodiments.

  FIG. 1 shows a schematic configuration of a gas turbine power generation facility F, which is an example of a facility to which an exhaust damper 1 according to an embodiment of the present invention is applied. The gas turbine power generation facility F is a facility that generates power by driving the generator 5 with the gas turbine 3, and is used as an emergency power source that cannot use a commercial power source 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 high temperature exhaust discharged from the gas turbine 3 to the outside is formed. The temperature of the exhaust 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 normally opened to allow the high-temperature exhaust G to pass therethrough, and when an abnormality such as a fire occurs in the power generation chamber 7, it is closed to prevent the spread of fire. In the example shown in the figure, the power generation chamber 7 is supplied with an air supply port 11 for taking in air introduced into the gas turbine 3 from the outside as a working medium and cooling air, and air after cooling the inside of the gas turbine 3 to the outside. Ventilation port 13 for exhausting the air is provided, and air supply damper 15 and ventilation damper 17 that are openable and closable are also attached to air supply port 11 and ventilation port 13, respectively.

  As shown in FIG. 2, the exhaust damper 1 includes a frame 21 and damper blades 25 fixed to the rotation shaft 23. An opening inside the frame 21 forms an exhaust passage. In the present embodiment, the frame 21 is formed in a rectangular shape. The exhaust damper 1 includes a plurality of (four in this example) damper blades 25 arranged in parallel to each other. In this example, each damper blade | wing 25 is arrange | positioned so that it may extend in a horizontal direction.

  A flange 27 for attaching the exhaust damper 1 to the exhaust port 9 (FIG. 1) is provided on the entire outer periphery of the frame 21. As shown in FIG. 3, the flange 27 is 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 generally flat member as a whole, and a central portion 25 a thereof is fixed to the rotating 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. But the aspect which attaches the damper blade | wing 25 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 as a whole have a shape capable of closing the rectangular opening 21 a (FIG. 2) of the frame 21. Reinforcing ribs 29 project from one surface of the damper blade 25. The reinforcing rib 29 is formed in a plate shape. In the present embodiment, the reinforcing rib 29 is extended 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 (four in the illustrated example) are provided at equal intervals in the longitudinal direction of the damper blade 25. By providing the reinforcing rib 29, thermal deformation due to the damper blade 25 being exposed to high-temperature exhaust is suppressed. In addition, the aspect of the reinforcing rib 29 is not limited to this example, For example, you may provide in the both surfaces of the damper blade | wing 25. Further, the reinforcing rib 29 may be omitted.

  The rotating shaft 23 of each damper blade 25 is rotatably supported by the frame 21 by bearings 31 at both ends 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 to be distinguished. Similarly, the bearing 31 that supports the first end of the rotating shaft 23 may be referred to as a first bearing 31A, and the bearing 31 that supports the second end may be referred to as a second bearing 31B.

  As shown in FIG. 5, in the present embodiment, each bearing 31 is supported on the outer surface 21 b of the frame 21 via a bearing support base 33. That is, the bearing support 33 is fixed to the outer surface 21 b of the frame 21, and the bearing 31 is attached to the outer surface 33 a of the bearing support 33. In the illustrated example, the bearing support base 33 is fixed to the frame 21 with 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 surface 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 a portion of the inner surface 21c of the frame 21 where at least the rotation shaft 23 is inserted. In the example shown in the figure, the reinforcing member 43 is provided over a portion of the inner surface 21 c 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 through a 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 damper blade 25 and the frame 21 in a state where the damper blade 25 is closed while avoiding the interference between the tip end portion of the fixing bolt 35 protruding toward the inner surface 21c side of the frame 21 and the damper blade 25 by the reinforcing member 43. A substantial seal is ensured between.

  For example, as shown in FIG. 3, the damper blade 25 of the exhaust damper 1 configured as described above connects the rotating shafts 23 of all the damper blades 25 by a common connecting member 49 via each connecting piece 47. 1 can be opened and closed simultaneously by driving any one of the rotating shafts 23 by the driving device 51 shown in FIG. In the present embodiment, considering that the exhaust damper 1 is used for the emergency power generation facility F, a DC electric motor is used as the driving device 51. But the drive mechanism for opening and closing the damper blade 25 is not limited to this example.

  As shown in FIG. 5, in this embodiment, a clearance C is formed between both ends 25b, 25b in the axial direction of the damper blade 25 and the inner portion 21d of the frame 21 facing the both ends 25b, 25b. Yes. In the present specification, the “inner portion 21 d of the frame 21” refers to a portion of the frame 21 or a member attached to the frame 21 that faces both ends 25 b and 25 b of the damper blade 25. In the illustrated example, a portion of the reinforcing member 43 that is a member attached to the inner side surface 21 c of the frame 21 is opposed to the both ends 25 b and 25 b of the damper blade 25, as “an inner portion 21 d of the frame 21”. If a member such as the 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 the both ends 25b, 25b of the damper blade 25 is “the frame 21 The inner portion 21d ". The clearance C is not simply a gap for avoiding the 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 the exhaust C In a state where the damper 1 is closed, the size is set such that the passage of the exhaust gas is substantially prevented.

  It is not essential to attach the reinforcing member 43 to the inner 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 21 c of the frame 21, and this may also be used as the reinforcing member 43. In any case, a clearance C is formed between the inner portion 21d of the frame 21 and the damper blade 25, which is the portion on the frame 21 side closest to both ends 25b, 25b of the damper blade 25.

  In the present embodiment, one end (second end) 23aB of the rotating shaft 23 is supported by the second bearing 31B so as to be slidable in the axial direction. The other end portion (first end portion) 23aA of the rotating shaft 23 is supported by the first bearing 31A in a state where the axial direction position is fixed. In this example, the second end 23aB side, which is the end opposite to the end connected to the drive device 51, of the rotating shaft 23 is slidably supported. As the first bearing 31A that slidably supports the first end portion of the rotating shaft 23, for example, a sliding 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 that is a member attached to the inner side surface 21 c of the frame 21. In other words, the reinforcing member 43 is divided into a plurality of portions via the slits 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 axial centers of the adjacent rotating shafts 23.

  As described above, the slit 53 is formed in the reinforcing member 43 to absorb the thermal elongation of the reinforcing member 43, thereby preventing the reinforcing member 43 from being deformed by the thermal elongation and coming into contact with the damper blade 25. it can. In particular, by forming the slits 53 at each position between the adjacent damper blades 25 in the reinforcing member 43, the reinforcing member 43 thermally expands almost uniformly around the position corresponding to each damper blade 25. The positional deviation of the rotation shaft 23 insertion hole of the member 43 is suppressed. But the position which forms the slit 53 in the reinforcement 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 that is the portion closest to the damper blade 25 on the frame 21 side. The thermal elongation in the axial direction of the damper blade 25 is absorbed. Thereby, the exhaust damper 1 can be stably operated for a long time even in an environment exposed to high-temperature exhaust.

  In addition, although this embodiment demonstrated the example which applied the exhaust damper 1 to the gas turbine power generation equipment F, the exhaust damper 1 which concerns on this invention can be applied also to the other use exposed to high temperature exhaust. .

  As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, or deletions can be made without departing from the spirit of the present invention. Therefore, such a thing is also included in the scope of the present invention.

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

Claims (4)

A frame whose inner opening forms an exhaust passage;
A damper blade fixed to a 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 blade in the axial direction and the inner portion of the frame facing the both ends.
Exhaust damper.   The exhaust damper according to claim 1, further comprising a bearing that rotatably supports the rotating shaft of the damper blade on the frame at both ends thereof, wherein one end of the rotating shaft is axially directed by the bearing. Exhaust damper that is slidably supported.   The exhaust damper according to claim 1 or 2, wherein a slit is formed in a reinforcing member attached to at least a portion of the inner side surface of the frame through which the rotating shaft is inserted. The exhaust damper according to claim 3, comprising a plurality of the damper blades arranged in parallel to each other,
The reinforcing member is provided across a portion of the inner surface of the frame through which the rotation shafts of the damper blades are inserted;
In the reinforcing member, the slit is formed at each position between the adjacent damper blades,
Exhaust damper.