KR102594162B1 - active clearance control sealing apparatus for turbin - Google Patents

Abstract

In order to improve sealing performance and durability, the present invention provides a connection between the casing of the turbine and the rotor provided inside the casing and is connected to the inner periphery of the casing facing both sides of the rotor. a pair of first ring parts curvedly extending to surround both lateral sides of the rotor, and a second pair of second ring parts whose ends are aligned opposite to each other of the first ring parts and curvedly extending to surround the upper and lower parts of the rotor. A ring portion that is divided and arranged in a ring shape, including a ring portion, and in which a labyrinth chamber is formed in a concave-convex shape on a radial inner side opposite to the outer circumference of the rotor; A plurality of first plate springs are inserted into first recessed grooves at both ends of one of the first ring portion and the second ring portion and are stacked in multiple layers, each having a first through hole passing through the center side; It is disposed in a stepped groove formed at both ends of the other side of the first ring part and the second ring part, and an insertion hole penetrates the central side, the central side covers the first recessed groove, and an edge of the first recessed groove is formed. A spring cover portion that is bolted and fixed to the edge side; It extends along the direction of gravity and is inserted through each of the first through holes and the insertion holes, one end of which is coupled to the step groove side, the other end of which is inserted into the bottom surface of the first recessed groove, and a locking step on the center side of the spring cover. a buffer rod portion protruding outward along the circumference to be disposed between the portion and the first plate spring; and a dummy sealing portion that is spray-coated on the surface of the labyrinth chamber to a preset thickness using a material containing nickel.

Description

Active clearance control sealing apparatus for turbine}

The present invention relates to an active clearance control sealing device for turbines, and more specifically, to an active clearance control sealing device for turbines that improves sealing performance and durability.

Generally, a turbine refers to a machine that converts the energy of fluids such as water, gas, or steam into useful mechanical work. In other words, a turbo-type machine that has several blades along the circumference of the rotating body and emits steam or gas to the blades to rotate at high speed is called a turbine. Recently, with industrialization and technological development, turbines such as steam turbines and gas turbines have tended to become increasingly larger, at higher temperatures, and at higher pressures.

Steam leakage from the seal between the rotating body and the fixed casing in the turbine is a major factor in reducing the efficiency of the turbine and increasing fuel costs, so design technology for sealing devices to reduce steam leakage is very important. It is important.

Here, sealing devices made of stainless steel used in high temperature and high pressure turbines such as steam or gas turbines play an important role in increasing the energy production efficiency of the generator by preventing growth or leakage of gas and preventing vibration of the rotating body due to fluid.

On the other hand, the tip clearance of a gas turbine varies due to expansion and contraction due to temperature differences between the rotating side structure and the stationary side structure during startup and rated operation, and centrifugal expansion due to rotation. In short, the variation in tip clearance is influenced by the compressor outlet temperature and combustion gas temperature, making clearance of the turbine first stage rotor blade particularly difficult.

In addition, as a tip clearance measure described above, active clearance control (ACC) is implemented to ensure the tip clearance required during startup and to realize the minimum tip clearance during rating.

However, the conventional sealing device is provided along the circumferential direction between the rotating body of the turbine through which high-pressure and high-temperature steam flows and a fixed casing, and the gap between the rotating body and the sealing device and between the casing and the sealing device is expanded in all directions. There was a problem in that the sealing performance deteriorated as it was difficult to maintain stably.

Korean Patent No. 10-2152991

In order to solve the above problems, the present invention aims to provide an active clearance control sealing device for turbines with improved sealing performance and durability.

In order to solve the above problem, the present invention is provided between the casing of the turbine and the rotor provided inside the casing, and the rotor is based on a connection portion provided to be connected to the inner circumference of the casing facing both sides of the rotor. a pair of first ring parts curvedly extending to surround both lateral sides of the rotor, and a second pair of second ring parts whose ends are aligned opposite to each other of the first ring parts and curvedly extending to surround the upper and lower parts of the rotor. A ring portion that is divided and arranged in a ring shape, including a ring portion, and in which a labyrinth chamber is formed in a concave-convex shape on a radial inner side opposite to the outer circumference of the rotor; A plurality of first plate springs are inserted into a first recessed groove at both ends of one of the first ring portion and the second ring portion and are stacked in multiple layers, each having a first through hole at the center side; It is disposed in a step groove formed at both ends of the other one of the first ring portion and the second ring portion, and an insertion hole penetrates the center side, the center side covers the first recessed groove, and the edge is the first recessed groove. A spring cover portion that is bolted and fixed to the edge of the recessed groove; It extends along the direction of gravity and is inserted through each of the first through holes and the insertion holes, one end of which is coupled to the step groove side, the other end of which is inserted into the bottom surface of the first recessed groove, and a locking step on the center side of the spring cover. a buffer rod portion protruding outward along the circumference to be disposed between the portion and the first plate spring; and a dummy sealing part that is spray-coated on the surface of the labyrinth chamber with a material containing nickel to a preset thickness, wherein both ends of each first ring part and each second ring part pass horizontally through the center of the rotor. It is aligned at a position spaced upward and downward from an imaginary horizontal line perpendicular to the direction of gravity and is formed as a cut surface cut in a direction parallel to the horizontal line, the buffer rod portion extends perpendicular to the horizontal line, and the first recessed groove A first rod guide groove and a second rod guide groove are respectively recessed in the direction of gravity in the bottom surface and the opposing step groove, and one end of the buffer rod portion is fixedly coupled while inserted into the second rod guide groove. , the other end of the buffer rod is inserted into the first rod guide groove so as to slide and reciprocate, and an insertion groove is recessed in the outer circumference of both ends of the first ring portion in a direction parallel to the horizontal line, and in a direction parallel to the horizontal line. It extends along the circumferential direction of the first ring portion from one end that is fitted into the insertion groove, and extends curvedly away from the radial direction of the first ring portion toward the other end, and is provided with a pair for each first ring portion. It further includes a curved cushioning plate portion disposed between the outside of the first ring portion and the inner periphery of the casing, and is inserted into a second recessed groove recessed radially inward from the outer periphery of the second ring portion, and is stacked in multiple layers, with a second penetration at the center side. A plurality of second plate springs each having a hole passing through them, an insertion rod portion inserted through each of the second through holes and having an inner end facing the bottom of the second recessed groove, and an outer surface facing the casing. It further includes an outer buffer plate portion that extends bent in the circumferential direction from the outer end of the insertion rod portion and includes a head portion that is bolted on both sides to an edge side of the second recessed groove and is rounded to correspond to the outer periphery of the ring portion, An active clearance control sealing device for a turbine is provided, wherein the second recessed grooves are recessed in a plurality of places on the outer periphery of the second ring portion at positions symmetrical to each other with respect to an imaginary vertical line passing vertically through the center of the rotor. .

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Through the above solutions, the present invention provides the following effects.

First, a pair of first ring parts and a pair of second ring parts are divided and combined, each labyrinth chamber facing the rotor coated with a dummy sealing part, and a pair of second ring parts are aligned and surround the rotor in the horizontal direction and the gravity direction to form a space between the dummy sealing part and the rotor. Since the gap is automatically adjusted, fluid leakage and contact wear damage are minimized, and sealing performance and durability can be significantly improved.

Second, the second ring is guided in the direction of gravity by the buffer rod extending along the direction of gravity perpendicular to the horizon and is cushioned by the first plate spring, thereby minimizing steam flow through the gap and resulting erosion/wear damage to the dummy base. This can significantly improve the sealing performance and durability of the product.

Third, since one end of the bending buffer plate is fitted into an insertion groove recessed in the direction parallel to the horizontal line on the outer circumference of the first ring portion, the bending buffer plate is cushioned against the inner circumference of the casing and the load acting on the one end side is alleviated when the load due to pressure is applied. Since the state in which it is inserted into the insertion groove is maintained stably, durability can be significantly improved.

Figure 1 is an exemplary diagram showing the use state of an active clearance control sealing device for a turbine according to an embodiment of the present invention.
Figure 2 is a front cross-sectional view showing an active clearance control sealing device for a turbine according to an embodiment of the present invention.
Figure 3 is an enlarged view of portion 'A' of Figure 2.
Figure 4 is an enlarged view of portion 'B' of Figure 2.
Figure 5 is an enlarged view of portion 'C' of Figure 2.
Figure 6 is an exemplary diagram showing a connection part in an active clearance control sealing device for a turbine according to an embodiment of the present invention.

Hereinafter, an active clearance control sealing device for a turbine according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is an exemplary diagram showing a state of use of an active clearance control sealing device for a turbine according to an embodiment of the present invention, and Figure 2 is a front cross-sectional view showing an active clearance control sealing device for a turbine according to an embodiment of the present invention. , Figure 3 is an enlarged view of part 'A' of Figure 2, Figure 4 is an enlarged view of part 'B' of Figure 2, Figure 5 is an enlarged view of part 'C' of Figure 2, and Figure 6 is an enlarged view of part 'C' of Figure 2. This is an exemplary diagram showing a connection part in an active clearance control sealing device for a turbine according to an embodiment.

As shown in Figures 1 to 6, the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention includes a ring part 10, a first plate spring 21, a spring cover part 22, and a shock absorber. It is provided including a rod part 23 and a dummy sealing part 40.

At this time, the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention is a high temperature and high pressure leak between the casing 1 of the turbine and the rotor 2 provided inside the casing 1 and rotating. By reducing the flow of fluid such as steam, the fluid can be provided to stably drive the turbine.

Here, the active clearance control sealing device 100 for a turbine is provided in the form of a ring and is used as a device for sealing the turbine in a non-contact manner. It creates a throttling process in the fluid and reduces the leakage flow rate. That is, the turbine active clearance control sealing devices 100 are arranged sequentially along the flow direction of the fluid to reduce the leakage flow rate of the fluid through the pressure drop effect that occurs in the process of repeated throttling and expansion of the fluid. .

Meanwhile, a clearance space is formed between the casing 1 of the turbine and the rotor 2 provided inside the casing 1, and the ring portion 10 is formed around the inner circumference of the casing 1 and the rotor 2. ) is placed in the gap space between.

In addition, the ring portion 10 has an outer circumference spaced apart from the inner circumference of the casing 1 and an inner circumference spaced apart from the outer circumference of the rotor 2, and the high-temperature and high-pressure fluid moves and the rotor 2 rotates at high speed. When the rotor 2 expands/contracts, the curved cushioning plate portion 24 and the outer cushioning plate portion 32, which will be described later, selectively contact the inner circumference of the casing 1 and the outer circumference of the rotor 2 to provide cushioning. function can be provided.

In addition, the ring portion 10 is divided to include a pair of first ring portions 11 and a pair of second ring portions 12 and are connected to each other via a buffer rod portion 23, which will be described later. The ring portion 11 and the second ring portion 12 are arranged to alternate with each other along the circumferential direction of the ring portion 10. In addition, both ends 11b of the first ring portion 11 are disposed opposite to each other at both ends 12b of the second ring portion 12, so that the overall shape of the ring portion 10 can be aligned and arranged to form a ring shape. there is.

In addition, the labyrinth chamber 11a is formed in a concavo-convex shape on the radial inner side opposite to the outer circumference of the rotor 2 in each of the first ring portions 11 and each second ring portion 12. At this time, it is preferable to understand that the labyrinth chamber (11a) formed in each of the first ring portions 11 and the labyrinth chamber (not shown) formed in each of the second ring portions 12 are formed in the same shape. It may be continuously aligned along the circumferential direction of the ring portion 10.

In addition, it is preferable that the surface of the labyrinth chamber 11a be provided with an abradeable dummy sealing portion 40 that is spray-coated to a preset thickness using a material containing nickel, chromium, and aluminum. Through this, the dummy sealing portion 40 is coated on the surface of the labyrinth chamber 11a and disposed opposite to the outer circumference of the rotor 2, so that when it contacts the rotor 2 that rotates and expands at high speed, the dummy sealing portion 40 is coated on the surface of the labyrinth chamber 11a. The part 40 may be worn instead of the labyrinth chamber 11a. Accordingly, only the eroded dummy sealing part 40 can be easily replaced without replacing the ring part 10, which is an expensive large precision part, thereby improving the maintenance convenience and economic efficiency of the device.

Meanwhile, the pair of first ring portions 11 are symmetrical to each other with respect to a pair of connecting portions 11c each provided to be connected to the inner periphery of the casing 1 in areas opposite to both sides of the rotor 2. It is preferable that it extends curvedly to surround both sides of the rotor 2 in the lateral direction. That is, the pair of first ring parts 11 are respectively disposed in opposing areas on both sides of the rotor 2 with respect to the radial center o of the rotor 2, It is preferable that it extends curvedly in a form that surrounds both sides of the direction.

At this time, the pair of first ring portions 11 horizontally penetrate the radial center o of the rotor 2 when the rotor 2 rotates and follow an imaginary horizontal line h perpendicular to the direction of gravity. That is, it can be selectively moved back and forth within a preset movement range along the lateral direction. At this time, the preset movement range may be set to correspond to the gap between the inner circumference of the casing 1 and the outer circumference of the rotor 2.

One side of the connecting portion 11c is connected to the casing 1 by being inserted into the mounting groove 1a recessed on the inner periphery of the casing 1, and the other side is connected to the circumferential central portion of the first ring portion 11. can be connected to Here, the central portion of the connecting portion (11c), where one side is connected to the casing (1) and the other side is connected to the circumferential central portion of the first ring portion (11), may be provided with a spring or the like to enable elastic compression/expansion like a spring. You can. At this time, the connecting portion 11c is connected to the casing 1 and mediates the connection so that the first ring portion 11 can reciprocate within a preset reciprocating movement range in the horizontal direction. It is desirable to understand it as a provided member.

Meanwhile, the pair of second ring parts 12 are respectively disposed in opposing areas at the upper and lower parts of the rotor 2 with respect to the radial center (o) of the rotor 2. It is preferable that it extends curvedly to surround the upper and lower parts.

That is, the pair of second ring portions 12 vertically penetrate the radial center o of the rotor 2 when the rotor 2 rotates and follow an imaginary vertical line v parallel to the direction of gravity. That is, it can selectively move back and forth within a preset movement range along the direction of gravity. At this time, the preset movement range may be set to correspond to the gap between the inner circumference of the casing 1 and the outer circumference of the rotor 2. At this time, in one embodiment of the present invention, the direction of gravity and the vertical direction are used with the same meaning.

At this time, the pair of second ring portions 12 may be connected via the buffer rod portion 23 with both ends 12b aligned opposite to both ends 11b of each first ring portion 11. , The space between the outer circumference of the second ring portion 12 and the inner circumference of the casing 1 may be cushioned and supported by an outer buffer plate portion 32, which will be described later.

At this time, when the pair of first ring parts 11 are reciprocated along the horizontal line h, the pair of second ring parts 12 connected thereto may also be interlocked and reciprocated in the same direction at the same time. Conversely, when the pair of second ring parts 12 are reciprocated along the vertical line v, the pair of first ring parts 11 connected thereto can also be interlocked and reciprocated in the same direction at the same time.

Meanwhile, referring to FIGS. 2 and 3, both ends 11b and 12b of each of the first ring portion 11 and each of the second ring portions 12 form a virtual ring penetrating the center of the rotor 2. It is preferable that it is aligned at a position spaced upward and downward from the horizontal line (h) and is formed as a cut surface cut in a direction parallel to the horizontal line (h). At the same time, the buffer rod portion 23 is preferably arranged to extend along the gravity direction of the ring portion 10 perpendicular to the horizontal line (h).

Accordingly, the pair of second ring parts 12 are guided along the direction of gravity by the buffer rod part 23 and can move back and forth, so that the labyrinth chamber (not shown) provided in the ring part 12 is used to operate the rotor. (2) It provides stable cushioning upon contact and can provide stable sealing performance.

In detail, the first leaf spring 21 is provided in the form of a plurality of disk springs and has a first recessed groove 11c recessed at both ends of one of the first ring part 11 and the second ring part 12. It is preferable that it is inserted and stacked in multiple layers. At this time, it is preferable that a first through hole (21a) is formed through the center of each of the first leaf springs (21) in the direction of gravity. At this time, in one embodiment of the present invention, the case where both ends of one of the first ring portion 11 and the second ring portion 12 are both ends 11b of the first ring portion 11 will be shown and described as an example. At this time, the first recessed groove (11c) may be formed by recessing from both ends (11b) of the first ring portion (11) along the direction of gravity.

In addition, the spring cover part 22 is disposed in a stepped groove 12d formed at both ends of the other side of the first ring part 11 and the second ring part 12, and has an insertion hole 22a at the center side. It is preferable that the center side covers the opening side of the first recessed groove (11c) and the rim is fixed by bolting to the edge side of the first recessed groove (11c). At this time, in one embodiment of the present invention, the case where both ends of the other side of the first ring part 11 and the second ring part 12 are both ends 11b of the second ring part 12 will be shown and described as an example.

At this time, the step groove 12d refers to a groove formed to be stepped in an 'ㄱ' shape at both ends 12b of the second ring portion 12, and is open in the direction opposite to the rotor 2 and at the same time It is preferable that the first ring portion 11 is opened in a direction opposite to both ends 11b. In addition, the step grooves 12d are preferably aligned so as to communicate with the first recessed grooves 11c in the direction of gravity.

In addition, it is preferable that the edge of the spring cover portion 22 is mutually partitioned with the insertion hole 22a formed through the center side, and the first bolt insertion hole is formed through the direction of gravity.

In addition, it is preferable that a first bolt fastening groove is formed recessed on the edge side of the first recessed groove 11c at a position opposite to the first bolt insertion hole so as to be aligned with the first bolt insertion hole. And, as a plurality of bolts are simultaneously fastened to the mutually aligned first bolt insertion hole and the first bolt fastening groove, the spring cover part 22 is fixed to both ends 11b of the first ring part 11. It can be.

Here, with the first plate spring 11 and the buffer rod part 23 disposed in the first recessed groove 11c, the spring cover part 22 is positioned at both ends of the first ring part 11 ( As it is fixed to 11b), the first leaf spring 11 and the buffer rod part 23 can be moved only within the first recessed groove 11c.

Meanwhile, the buffer rod portion 23 preferably extends along the gravity direction of the ring portion 10 and is sequentially inserted into each of the first through holes 21a and the insertion hole 22a. Here, the buffer rod portion 23 preferably has one end coupled to the step groove 12d and the other end inserted into the bottom surface of the first recessed groove 11c.

In detail, on the center side of the bottom surface of the first recessed groove 11c, a first rod guide groove 11e is formed to be stepped from the first recessed groove 11c in the direction of gravity, and the first load guide groove 11e ) A second rod guide groove 12e may be formed to be recessed in the direction of gravity in a stepped manner from the step groove 12d in the step grooves 12d that face each other.

And, both ends of the buffer rod portion 23 are inserted into the first rod guide groove 11e and the second rod guide groove 12e, respectively, and one end of the buffer rod portion 23 is inserted into the second rod guide groove 11e. When inserted into the guide groove (12e), it is fixedly coupled to the second ring portion (12) by welding, etc., and the other end of the buffer rod portion (23) is inserted into the first rod guide groove (11e) and slides. It can be moved back and forth.

In addition, the buffer rod part 23 is preferably formed to protrude outward along the circumference so that a stopping step 23a is disposed between the spring cover part 22 and the first plate spring 21 on the center side in the direction of gravity. do. At this time, the stopping step (23a) may be disposed inside the first recessed groove (11c) and be provided to reciprocate along the direction of gravity.

At this time, the distance between the stopping step (23a) at one end of the buffer rod portion (23) is the distance between both ends of the first ring portion (11) on the bottom surface of the second rod guide groove (12e). It can be set to exceed. At the same time, the distance between the other end of the buffer rod part 23 and the stopping step 23a is the distance between both ends of the first ring part 11 on the bottom surface of the first rod guide groove 12e. It can be set to less than.

In addition, the length of the buffer rod portion 23 is preferably set to be less than the distance between the bottom surface of the first rod guide groove (11e) and the bottom surface of the second rod guide groove (12e). At the same time, the length of the buffer rod portion 23 may be set to exceed the gap between the bottom surface of the edge of the first recessed groove 11c and the step groove 12d.

That is, the buffer rod portion 23 has one end connected to the step groove 12d and the other end connected to the bottom surface of the first recessed groove 11c, so that the second ring portion 12 is formed by the first ring portion. It may be provided to mediate the connection between the first ring portion 11 and the second ring portion 12 while providing a buffering function to cushion the shock absorber (11).

Therefore, when the rotor 2 is rocked, the labyrinth chambers 11a of the pair of first ring portions 11 disposed on both sides of the rotor 2 buffer and protect the rotor 2 in the horizontal direction. Since the labyrinth seal of the pair of second ring parts 12 disposed on the upper and lower sides of the rotor 2 cushions and protects the rotor 2 in the direction of gravity, sealing performance against high-pressure fluid can be significantly improved. there is. That is, the sealing performance against high-pressure fluid in all circumferential directions of the ring portion 10 can be significantly improved, and the durability of the rotor 2 can be significantly improved.

Through this, the first ring part 11 and the second ring part 12 are each provided in pairs to surround both sides and the top and bottom of the rotor 2 to protect the rotor 2 in the horizontal direction and the gravity direction. Since the dummy sealing portion 40 is coated on each labyrinth chamber 11a and faces the outer circumference of the rotor 2, fluid flow through the gap between the dummy sealing portion 40 and the rotor 2 is minimized. Wear of the labyrinth chamber 11a can be prevented, and sealing performance and durability can be significantly improved.

That is, the pair of first ring parts 11 and the pair of second ring parts 12 are divided and combined and each labyrinth chamber 11a facing the rotor 2 is coated with the dummy sealing part 40. ) is aligned and surrounds the horizontal direction and the gravity direction of the rotor 2, and moves elastically according to fluid pressure changes within an interval corresponding to the maximum deviation of the rotation trajectory when the rotor 2 rotates at high and low speeds. Since the gap between the dummy sealing part 40 and the rotor 2 is automatically adjusted, fluid leakage due to an excessive gap and contact wear damage due to an undergap are minimized, thereby improving the sealing performance and durability of the device.

In addition, both ends of the first ring portion 11 and the second ring portion 12 aligned to face each other are cut in a direction parallel to the horizontal line h at positions spaced upward and downward from the horizontal line h. The second ring part 12 is guided in the direction of gravity by the buffer rod part 23, which is formed as and extending along the direction of gravity perpendicular to the horizontal line (h), and the first ring part 11 and the second ring part 11 are guided in the direction of gravity. Since the first plate spring 21 disposed between both ends of the two-ring part 12 is cushioned, the flow of steam through the gap and the resulting erosion/wear damage to the dummy base are minimized, thereby significantly improving the sealing performance and durability of the product. You can.

Meanwhile, referring to FIGS. 2 and 4, it is preferable that insertion grooves 11f are recessed in the outer periphery adjacent to both ends 11b of the first ring portion 11 in a direction parallel to the horizontal line h. At this time, the insertion grooves 11f are preferably formed at positions spaced apart from the first recessed grooves 11c.

In addition, the curved cushioning plate portion 24 extends in a direction parallel to the horizontal line h and follows the circumferential direction of the first ring portion 11 from one end portion 24a fitted into the insertion groove 11f. It is preferable that it extends in a curved manner, moving away from the radial direction of the first ring portion 11 toward the other end 24b disposed on the outside.

Accordingly, the insertion groove ( Since it is fitted into the insertion groove 11f), when a load is applied from the other end 24b of the curved cushioning plate 24, the load acting on the one end 24a is alleviated and the state of being fitted into the insertion groove 11f is stably maintained. Since it can be maintained, durability can be significantly improved.

In addition, the curved cushioning plate portion 24 is provided in a pair for each first ring portion 11 and is disposed between the radial outer side of the first ring portion 11 excluding the connecting portion 11c and the inner periphery of the casing 1. It can be provided to provide elastic recovery force when the other end 24b is pressed by contacting the inner circumference of the casing 1. At this time, in one embodiment of the present invention, the case where the curved cushioning plate portion 24 is provided in a pair for each first ring portion 11, making a total of four, is shown and explained as an example.

Through this, when the first ring portion 11 reciprocates in the horizontal direction, the curved cushioning plate portion 24 cushions and supports the inner circumference of the casing 1, thereby protecting the rotor 2 and improving durability.

Meanwhile, referring to FIGS. 2 and 5, the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention further includes a plurality of second plate springs 31 and a plurality of outer shock plate portions 32. It is desirable to include it.

Here, the second leaf spring 31 is provided in the form of a plurality of disk springs, is inserted into the second recessed groove 12f recessed radially inward from the outer periphery of the second ring part 12, and is stacked in multiple layers. It is preferable that the second through holes 31a are formed through each central side.

At this time, the second recessed grooves 12f may be spaced apart from each other along the circumferential direction of the ring portion 10 on the outer periphery of the second ring portion 12 and may be recessed in a plurality of places along the radial direction of the ring portion 10. there is. Furthermore, although not shown in the drawing, the second recessed groove may be recessed in the first ring portion 11. Additionally, the second recessed groove 12f may be formed in a plurality of places on the outer periphery of the second ring portion 12 at positions symmetrical to each other with respect to the vertical line v.

In addition, the second leaf spring 31 may be inserted in plural numbers into each of the second recessed grooves 12f, and may be inserted even when the second recessed groove is formed in the first ring portion 11. there is.

Meanwhile, the outer buffer plate portion 32 is inserted through each of the second through holes 31a and has an insertion rod portion 32a whose inner end faces the bottom surface of the second recessed groove 12f, and an outer surface thereof. It faces the inner periphery of the casing (1), but extends bent from the outer end of the insertion rod portion (32a) in the circumferential direction of the ring portion (10), and both edges are formed on the edge side of the second recessed groove (12f). It is preferable to include a head portion (32b) bolted to the second bolt fastening groove (12g).

Here, it is preferable that a second bolt insertion hole (32c) is formed penetrating the edge of the head portion (32b) in the direction of gravity. In addition, a second bolt fastening groove (12g) is recessed on the edge side of the second recessed groove (11c) at a position opposite to the second bolt insertion hole (32c) so as to be aligned with the second bolt insertion hole (32c). This is desirable. And, as a plurality of bolts 32d are simultaneously fastened to the mutually aligned second bolt insertion hole 32c and the second bolt fastening groove 12g, the outer shock plate portion 32 is formed by the second ring portion ( 12) or, in some cases, may be fixed to the outer circumference of the first ring portion 11, respectively.

Here, with the second plate spring 31 disposed in the second recessed groove 12f, the outer shock plate portion 32 is fixed to the outer periphery of the second ring portion 12, thereby causing the second plate spring to (31) can be moved only inside the second recessed groove (12f). In addition, the outer surface of the head portion 32b is formed to be rounded to correspond to the outer periphery of the ring portion 10, and is arranged to protrude radially outward from the outer periphery of the second ring portion 12 to form a shape of the casing 1. It is opposed to the inner periphery and can be selectively contacted and cushioned.

Meanwhile, the first ring portion 11 may be manufactured by dividing each of the first ring portions 11 into a plurality of places along the circumferential direction, and then each end may be joined to each other to form one first ring portion 11. In addition, the second ring portion 12 can be manufactured by dividing each of the plurality of parts along the circumferential direction, and then each end is joined to each other to form one second ring portion 12.

For example, the first ring portion 11 may be manufactured by dividing into pairs based on the vertical line v and then fitted together, and the first ring portion 11 may be divided into pairs based on the horizontal line h. It can be manufactured by dividing it into pieces and then fitting them together.

At this time, a molding protrusion (not shown) is formed on one side of each opposing surface of the divided first ring portion 11 and the second ring portion 12, and a molding groove (not shown) is formed on the other side to form the molding protrusion ( (not shown) may be fitted with each other by fitting into the fitting groove (not shown).

Meanwhile, in the manufacturing method of the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention, the ring portion 10 including the first ring portion 11 and the second ring portion 12 is centrifugal. It may include a step of manufacturing by casting, a step of heat treating the ring portion 10, a step of roughing the surface of the ring portion 10, and a step of inspecting the defective state of the ring portion 10.

Next, the manufacturing method of the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention includes the step of connecting both ends of the first ring portion 11 and the second ring portion 12 by tag welding. It can be included.

In addition, the method of manufacturing the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention includes the first recessed groove (11c), the first rod guide groove (11e), and the second recessed groove ( 12f), the step groove 12d and the second rod guide groove 12e may be formed by processing.

In addition, the manufacturing method of the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention includes each of the first ring parts 11 and each of the second ring parts opposing the outer circumference of the rotor 2 ( 12) may include the step of forming each of the labyrinth chambers 11a in a concavo-convex shape on the radial inner side.

In addition, in the method of manufacturing the active clearance control sealing device 100 for a turbine according to an embodiment of the present invention, the dummy sealing portion 40 on the surface of the labyrinth chamber 11a includes nickel, chromium, and aluminum. The material may include the step of being thermally spray-coated to a preset thickness and then subjected to surface processing.

The active clearance control sealing device 100 for a turbine according to an embodiment of the present invention is provided between the casing 1 and the rotor 2 to provide sealing performance, and when the rotor 2 is rotated, the active clearance control sealing device 100 is provided between the casing 1 and the rotor 2. The external force acting in this direction is buffered by each of the curved buffer plate parts 24, and the external force acting in the direction of gravity is buffered by each of the outer buffer plate parts 32, so that it is cushioned in all directions in the circumferential direction of the ring part 10. It provides stable sealing performance and the durability of the product can be significantly improved.

At this time, terms such as “include,” “comprise,” or “equipped” described above mean that the corresponding component may be present, unless specifically stated to the contrary, excluding other components. It should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

As described above, the present invention is not limited to the above-described embodiments, and modifications and implementations can be made by those skilled in the art without departing from the scope of the claims of the present invention. And such modifications fall within the scope of the present invention.

1: Casing 2: Rotor
10: ring part 11: first ring part
12: 2nd ring part 21: 1st leaf spring
22: spring cover part 23: buffer rod part
24: Bend buffer plate portion 31: Second plate spring
32: Outer buffer plate part 40: Dummy sealing part
100: Active clearance control sealing device for turbine

Claims (5)

It is provided between the casing of the turbine and the rotor provided inside the casing, and extends curvedly to surround both lateral sides of the rotor based on a connection portion provided to be connected to the inner periphery of the casing opposite to both sides of the rotor. It is divided into a pair of first ring parts and a pair of second ring parts, both ends of which are aligned opposite to each other of the first ring parts and curvedly extending to surround the upper and lower parts of the rotor, and are arranged in a ring shape. , a ring portion in which a labyrinth chamber is formed in a concavo-convex shape on a radial inner side opposite to the outer circumference of the rotor;
A plurality of first plate springs are inserted into a first recessed groove at both ends of one of the first ring portion and the second ring portion and are stacked in multiple layers, each having a first through hole at the center side;
It is disposed in a step groove formed at both ends of the other one of the first ring portion and the second ring portion, and an insertion hole penetrates the center side, the center side covers the first recessed groove, and the edge is the first recessed groove. A spring cover portion that is bolted and fixed to the edge of the recessed groove;
It extends along the direction of gravity and is inserted through each of the first through holes and the insertion holes, one end of which is coupled to the step groove side, the other end of which is inserted into the bottom surface of the first recessed groove, and a locking step on the center side of the spring cover. a buffer rod portion protruding outward along the circumference to be disposed between the portion and the first plate spring; and
A dummy sealing part that is spray-coated on the surface of the labyrinth chamber with a material containing nickel to a preset thickness,
Both ends of each first ring portion and each second ring portion pass horizontally through the center of the rotor and are aligned at positions spaced upward and downward from an imaginary horizontal line perpendicular to the direction of gravity and cut in a direction parallel to the horizontal line. It is formed as a cut surface, and the buffer rod portion extends perpendicular to the horizontal line,
A first rod guide groove and a second rod guide groove are respectively recessed in the direction of gravity in the bottom surface of the first recessed groove and the step groove opposite to the first recessed groove,
One end of the buffer rod portion is fixedly coupled while inserted into the second rod guide groove, and the other end of the buffer rod portion is inserted into the first rod guide groove to slide and reciprocate,
An insertion groove is recessed in the outer circumference of both ends of the first ring portion in a direction parallel to the horizontal line, and extends in a direction parallel to the horizontal line to form a circumferential direction of the first ring portion from one end that is fitted into the insertion groove. It extends along the other end and curves away from the radial outer side of the first ring portion toward the other end, and is provided in a pair for each first ring portion, further comprising a curved cushioning plate portion disposed between the outer side of the first ring portion and the inner periphery of the casing,
A plurality of second plate springs are inserted into a second recessed groove recessed radially inward from the outer periphery of the second ring portion and are stacked in multiple layers, each having a second through hole on the center side, and each penetrating through the second through hole. An insertion rod portion is inserted and has an inner end facing the bottom surface of the second recessed groove, and an outer surface faces the casing and extends bent in the circumferential direction from the outer end of the insertion rod portion, and both sides are of the second recessed groove. It further includes an outer shock plate portion that is bolted to the edge side and includes a head portion that is rounded to correspond to the outer periphery of the ring portion,
The second recessed groove is a plurality of recessed grooves formed on the outer circumference of the second ring portion at positions symmetrical to each other with respect to an imaginary vertical line passing vertically through the center of the rotor. delete delete delete delete