JP2016223426A - Flexible packing ring for turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible packing ring for a turbine that is installed at a rotating shaft [a rotor shaft] such as a turbine shaft of power generating facilities and capable of preventing leakage of oil at a bearing side or flowing-in of external foreign substances at the bearing side.SOLUTION: A flexible packing ring for a turbine of this invention has a feature that a first seal ring housing that is formed like an arc-shape corresponding to at least a part of a circle and a second seal ring housing that is formed like an arc-shape corresponding to at least the other part of the circle are combined to form one circle, a first fixed seal ring is engaged with an inside part of the first seal ring housing, a second fixed seal ring is engaged with an inside part of the second seal ring housing, and at least one movable seal ring is engaged with an inside part of each of the first fixed seal ring and the second fixed seal ring.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexible packing ring for a turbine. More specifically, the present invention is provided on a rotating shaft of a turbine of a power generation facility such as a steam turbine or a gas turbine, and high temperature / high pressure steam, air, or The present invention relates to a flexible packing ring for a turbine that can prevent gas or the like from leaking out or an external foreign matter from flowing in.

A turbine generally refers to a device that converts kinetic energy of a high-speed fluid into mechanical energy, and mainly switches fluid energy to rotational motion. It is classified into a gas turbine, an air turbine, a steam turbine, etc. according to the type of fluid that provides energy.
In this type of turbine, the efficiency is reduced by the fluid leaking from between the rotor and the stator, and the fuel cost is increased. Therefore, a technology for sealing the fluid is very important for the turbine.

The following Patent Documents 1 to 3 all relate to a seal ring provided on a turbine shaft. However, there is a problem that a seal ring is worn by rotation of the shaft, a gap is generated, and a sealing force is reduced. There is.
For this reason, the present inventors have applied for the following Patent Document 4. Hereinafter, Patent Document 4 is referred to as a conventional technique.

  Prior art 4 will be briefly described. This technology enables the operation of a steam turbine by providing a packing plate on the pump seal body of the power generation turbine, which is supported by being urged by a leaf spring, so that no gap is generated even if the pump seal is worn. Sometimes it prevents steam from leaking between the pump seal and the rotor.

However, the conventional technology has the following problems.
First, as a first problem, the pump seal is basically designed in a shape that can obtain the optimum operating performance with respect to the turbine rotor. Since the design shape is changed, the rotor operation performance predicted at the time of the initial design may not be obtained.
For example, when excessive frictional force and frictional heat are generated in the friction between the packing plate and the rotor, such frictional force reduces the rotational performance of the rotor, and the frictional heat is transmitted to the entire pump seal. There is a problem that it is easy to cause thermal deformation. This has the problem that the performance and energy efficiency of the power generation turbine are reduced.

  As a second problem, in order to prevent the packing plate from rotating in the circumferential direction, the pin is inserted from one surface of the pump seal, but the pin is inserted into the side surface of the pump seal. Since the hole formed in the direction perpendicular to the rotation direction reduces the structural stability of the pump seal and exposes one end of the pin to the outside of the pump seal. Problems such as pins falling off due to vibrations during rotation, and adverse effects on adjacent components occur.

  The third problem is that the center of gravity of the packing plate is biased to one side due to the fact that the pin is inserted from one side of the pump seal and that the hole for inserting the pin must be processed separately. Inevitably, this causes the problem that the operating characteristics of the pump seal with respect to the rotor on the front and rear surfaces differ.

US Pat. No. 5,599,026 US Pat. No. 6,257,586 PCT / JP99 / 03760 Korean Patent No. 10-1016210 JP 2012-140989 A

  In order to solve the above problems, the present invention maintains a basic design shape designed to maintain the operating characteristics of the turbine shaft in an optimum state when configuring a packing ring for a turbine. An object of the present invention is to provide a flexible packing ring for a turbine that can exhibit optimum sealing performance.

  Another object of the present invention is to provide a flexible packing ring for a turbine that guarantees the operating characteristics of the rotor shaft and prevents the components related to the movable seal ring from being exposed to the outside or pulled out. For other purposes.

  In addition to these, the present invention can greatly improve the sealing performance by minimizing the combined area between the two seal ring housings constituting the packing ring, and also when used over a long period of time. It is still another object of the present invention to provide a flexible packing ring for a turbine capable of continuously ensuring sufficient sealing performance.

  To achieve the above object, a flexible packing ring for a turbine according to the present invention corresponds to a first seal ring housing formed in an arc shape corresponding to at least a part of a circle and at least another part of a circle. And a second seal ring housing formed in an arcuate shape to form a circular shape, and a first fixed seal ring is engaged inside the first seal ring housing, and the second seal ring housing A second fixed seal ring is attached to the inside of the first fixed seal ring, and at least one movable seal ring is attached to the inside of each of the first fixed seal ring and the second fixed seal ring.

  In addition, the first seal ring housing and the first fixed seal ring, the second seal ring housing and the second fixed seal ring, the first fixed seal ring and the movable seal ring, and the second fixed seal ring, At least one of the movable seal rings is slidably fitted in the arc direction.

  Further, the movable seal ring is fitted from at least one direction of the first fixed seal ring and the second fixed seal ring, and at least one of the first fixed seal ring and the second fixed seal ring. A stopper that restricts movement of the movable seal ring in the arc direction is provided at the end portion in the other direction.

  Further, at least one of the first fixed seal ring and the second fixed seal ring is formed with an insertion hole into which the movable seal ring is slidably fitted in the inner and outer directions. An elastic tool for pressing the movable seal ring inward is provided.

Further, at least one fitting groove is formed on the outer surface of the movable seal ring, and the elastic member is formed by a leaf spring in which a fitting portion fitted in the fitting groove is bent. .
Furthermore, the movable seal ring includes a movable body that is slid and fitted in an insertion hole formed in at least one of the first fixed seal ring and the second fixed seal ring in an arc direction; A movable triangular blade projecting on the inner surface.

  Further, at least one of the first fixed seal ring and the second fixed seal ring is formed with at least one retaining claw at the inner end of the insertion hole, and the movable sealing ring has a retaining claw. A locking projection to be locked to is formed.

  Furthermore, at least one fixed triangular blade is formed on the inner surface of at least one of the first fixed seal ring and the second fixed seal ring corresponding to the shape of the engagement surface of the rotor shaft, and is movable. The height of the triangular blade is formed so as to be higher than that of the fixed triangular blade by an amount corresponding to the dimension into which the movable body is inserted by the elastic tool provided inside the insertion hole in the state of being provided on the rotor shaft. It is characterized by that.

  Furthermore, on the inner surface of at least one of the first fixed seal ring and the second fixed seal ring, a first fixed triangular blade having different heights corresponding to the shape of the engaging surface of the rotor shaft, and The second fixed triangular blade is formed, and the height of the movable triangular blade is provided on the rotor shaft as compared with any one of the first fixed triangular blade and the second fixed triangular blade. The elastic member provided inside the insertion hole is formed so as to be higher by an amount corresponding to the dimension into which the movable body is inserted.

  Further, the movable seal ring is provided with at least two guide pins, and both side ends further include guide pins fitted into the two movable seal rings, respectively, and in the process of moving the movable seal ring inward or outward, the adjacent two The movement of the two movable seal rings is guided by the interaction by the guide pins.

By means of the above solution, the present invention ensures that the sealing ring (packing ring) for the turbine maintains the basic shape designed to maintain the operating characteristics of the turbine shaft in the optimum state, and the optimum sealing performance. There is a feature that can be demonstrated.
In particular, the present invention guarantees the operating characteristics of the rotor shaft by disposing a movable seal ring for improving the sealing force at the center of the fixed seal ring, and the components related to the movable seal ring are externally provided. It can be prevented from being exposed or pulled out.

In addition, the present invention is not only easy to mount from the structural side by combining two semi-circular seal ring housings to form one circular flexible packing ring, but also when used over a long period of time. The structural stability of the formed portion is sustained.
Furthermore, the present invention can greatly improve the sealing performance by minimizing the combined area between the two seal ring housings constituting the packing ring, and is sufficient for long-term use. There is a feature that the sealing performance can be continuously guaranteed.

  Therefore, the packing ring of the present invention is used in the field of flexible packing rings for turbines, particularly in the field of flexible packing rings used in high-pressure turbines for large-capacity power generation facilities, as well as the rotor shafts of various facilities to which sealed structures are applied. Reliability and competitiveness can be improved in similar or related fields such as the packing ring field.

It is a partial notch perspective view which shows the use condition of the flexible packing ring for turbines by this invention. It is the elements on larger scale of the notch surface of FIG. It is a perspective view which shows the combination relationship between the fixed seal ring and movable seal ring which are shown in FIG. It is a figure explaining the function of the elastic tool shown in FIG. It is a block diagram which shows the arrangement | positioning relationship of the movable seal ring shown in FIG. It is the elements on larger scale explaining the function of the guide pin shown in FIG. It is a figure which shows other embodiment of FIG. It is a figure which shows the arrangement | positioning relationship of the movable seal ring and fixed seal ring which are shown in FIG. It is a figure which shows the cross-sectional shape with respect to embodiment of the movable seal ring shown in FIG. It is the elements on larger scale which show one Embodiment of the fixed seal ring corresponding to (c) of FIG.

Various examples of the flexible packing ring for a turbine according to the present invention can be applied.
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.
Further, in describing each drawing later, with reference to the flexible packing ring A for the turbine, the side on which the rotor shaft RS is engaged is defined as the inside, the opposite side is defined as the outside, and the interior of the apparatus in which the bearings are provided The inside is the inside, and the outside of the device is the outside.
As a result, the flexible packing ring A for a turbine according to the present invention has the rotor shaft RS attached to the inner side to prevent internal steam, air, gas, etc. from leaking out of the apparatus, It has a function to prevent inflow into the device.

FIG. 1 is a partially cutaway perspective view showing a usage state of a flexible packing ring for a turbine according to the present invention.
As shown in FIG. 1, a flexible packing ring A for a turbine includes a first seal ring housing 100 engaged in an arc shape corresponding to at least a part of a circle, and an arc shape corresponding to at least another part of the circle. The second seal ring housing 200 is provided.

Combining the first seal ring housing 100 and the second seal ring housing 200 results in a flexible packing ring A for a circular turbine.
At this time, the shapes of the first seal ring housing 100 and the second seal ring housing 200 are not necessarily the same.

In general, when there are two points on the circumference, these two points divide the circumference into two arcs, and if the line connecting the two points has a diameter passing through the center of the circle, the length of the two arcs That is the same.
If the line segment connecting the two points is not the diameter of the circle, the lengths of the two arcs are different, and the short arc is a subarc and the long arc is a dominant arc.
Therefore, for example, when the first seal ring housing 100 is inferior arc, the second seal ring housing 200 becomes superior arc, and it goes without saying that the length of each arc can be changed variously. Absent.

  However, in order to easily remove and repair or replace the flexible packing ring A for the turbine, which is one of the effects of the present invention, from the rotor shaft RS (Rotor Spindle RS), as shown in FIG. Further, it is preferable that the first seal ring housing 100 and the second seal ring housing 200 are formed in the same semicircular shape.

  In addition, as shown in FIG. 1, a first fixed seal ring 110 is engaged inside the first seal ring housing 100 (in the direction of the rotor shaft in FIG. 1), and inside the second seal ring housing 200. A second fixed seal ring 210 is engaged. At this time, the first fixed seal ring 110 is pressed and supported inside by a separate elastic member (rectangle in FIG. 1) provided in a space that engages with the first seal ring housing 100.

Further, at least one movable seal ring 300 is engaged with each of the first fixed seal ring 110 and the second fixed seal ring 210.
Details of the engagement structure and the arrangement relationship between the first fixed seal ring 110, the second fixed seal ring 210, and the movable seal ring 300 will be described later.

As shown in FIG. 1, the first seal ring housing 100 and the second seal ring housing 200 are combined in a direction orthogonal to the axial direction of the rotor shaft RS.
Therefore, the first seal ring housing 100 and the first fixed seal ring 110, and the first fixed seal ring 110 and the movable seal ring 300 are engaged with each other so as to be slidable in the arc direction.
The engagement relationship between the second seal ring housing 200 and the second fixed seal ring 210 and between the second fixed seal ring 210 and the movable seal ring 300 is also the same.

  Hereinafter, the first seal ring housing 100, the first fixed seal ring 110, and the movable seal ring 300 will be mainly described, but unless otherwise specified, the second seal ring housing 200, the second fixed seal, and the like. The structures and engagement relationships of the ring 210 and the movable seal ring 300 are the same as or similar to the structures and engagement relationships of the first seal ring housing 100, the first fixed seal ring 110, and the movable seal ring 300.

FIG. 2 is a partially enlarged view of the cutout surface of FIG. 1, and FIG. 3 is a perspective view showing a combination relationship between the fixed seal ring and the movable seal ring shown in FIG.
As shown in FIG. 2, the first fixed seal ring 110 is fitted inside the first seal ring housing 100 (downward in FIG. 2).

In addition, the movable seal ring 300 is fitted into a fitting hole 113 formed on the inner surface of the first fixed seal ring 110.
More specifically, as shown in FIG. 2, the movable seal ring 300 includes a movable body 310 that is slidably fitted in an insertion hole 113 formed in the first fixed seal ring 110 in an arc direction, and a movable body. And a movable triangular blade 320 projecting from the inner surface of 310.
The shape of the movable triangular blade 320 corresponds to the shape of the triangular blade formed into an optimum shape when the turbine flexible packing ring A is initially designed.

As shown in FIG. 2, the movable body 310 is engaged with the insertion hole 113 so as to be movable in the inner and outer directions, but the movable body 310 is pulled out from the first fixed seal ring 110 inward. In order to prevent this, at least one retaining claw 114 is formed at the inner end of the insertion hole 113.
Further, the movable seal ring 300 is formed with a locking projection 330 that is locked to the retaining claw 114.

On the other hand, a plurality of fixed triangular blades are formed on the inner side surface of the first fixed seal ring 110 for blocking between the inside and the outside.
In particular, the fixed triangular blade has a relatively high first fixed triangular blade 111 and a relatively low second fixed triangular blade 112 corresponding to the shape of the rotor shaft RS, as shown in FIG. Each is formed.
Next, when the first fixed triangular blade 111 is worn by the operation of the rotor shaft RS, a gap is generated between the first fixed triangular blade 111 and the rotor shaft RS.

  Therefore, in the present invention, as shown in FIG. 2, the flexible packing ring A for the turbine is engaged with the rotor shaft RS in a state where the movable triangular blade 320 of the movable seal ring 300 is pressed inward by the elastic tool 400. Then, the movable triangular ring 320 is brought into close contact with the outer surface of the rotor shaft RS while a predetermined portion of the movable seal ring 300 is inserted into the insertion hole 113.

Even if the movable triangular blade 320 is worn by the operation of the rotor shaft RS, the movable seal ring 300 is pressed inward by the elastic tool 400, so that no gap is formed between the movable triangular blade 320 and the rotor shaft RS. By this, the sealing property between the inside and the outside is improved.
More specifically, the first fixed seal ring 110 is formed with an insertion hole 113 in which the movable seal ring 300 is slidably engaged in the inner and outer directions (vertical direction in FIG. 2). Is provided with an elastic tool 400 that presses the movable seal ring 300 inward (box-shaped arrow in FIG. 2).

As shown in FIG. 3, at least one fitting groove 301 is formed on the outer surface of the movable seal ring 300, and the elastic tool 400 is a plate in which the fitting portion 410 fitted in the fitting groove 301 is bent. Formed by a spring.
For this reason, the movable seal ring 300 is fitted into the fitting hole 113 of the first fixed seal ring 110 in a state where the fitting portion 410 of the elastic tool 400 is fitted in the fitting groove 301.

  At this time, the height of the movable triangular blade 320 of the movable seal ring 300 is the height of one of the first fixed triangular blade 111 and the second fixed triangular blade 112 in a state of being provided on the rotor shaft RS. Compared to the above, it is preferable that the elastic tool 400 provided in the insertion hole 113 is formed so as to be higher by a size corresponding to the dimension into which the movable body 310 is inserted.

As shown in FIG. 3, the movable seal ring 300 is fitted from one direction (left side in FIG. 3) of the first fixed seal ring 110 while being moved in the arc direction.
At this time, in order to prevent the movable seal ring 300 from excessively moving and being pulled out in the other direction of the first fixed seal ring 110, the other direction of the first fixed seal ring 110 (the lower right direction in FIG. 3). ) Is provided with a stopper 500.

The stopper 500 also serves to prevent the movable seal ring 300 from moving along the rotation direction when the rotor shaft RS rotates while the turbine flexible packing ring A is engaged with the rotor shaft RS. .
Further, the stopper 500 is provided inside the first fixed seal ring 110 and is inserted into the interior when the first fixed seal ring 110 and the second fixed seal ring 120 are engaged. It can be prevented that the rotor shaft RS is pulled out to the outside due to vibration of the rotor shaft RS.

FIG. 4 is a diagram illustrating the function of the elastic tool shown in FIG.
As shown in FIG. 4, when the elastic member 400 of the leaf spring is positioned in the insertion hole 113 formed in an arcuate curved surface, a repulsive force (pressing force) is generated at the contact portion.
Specifically, as shown in FIG. 4, when the fitting portion 410 is fitted in the fitting groove 301 of the movable seal ring 300, the movable seal ring 300 is placed inside the fitting portion 410 of the elastic tool 400. The force which presses the 1st fixed seal ring 110 to the outer side is generated in the edge part (left side in FIG. 4) which opposes the fitting part 410 of the elastic tool 400.
As a result, these two forces can be combined to press the movable seal ring 300 inward.

  5 is a block diagram showing the arrangement relationship of the movable seal ring shown in FIG. 1, FIG. 6 is a partially enlarged view for explaining the function of the guide pin shown in FIG. 5, and FIG. FIG. 8 is a diagram showing an arrangement relationship between the movable seal ring and the fixed seal ring shown in FIG. 5.

As shown in FIG. 5, the movable seal ring 300 is engaged with one first fixed seal ring 110 while a plurality of unit seal rings 300a to 300c are arranged in this order.
Thus, when the movable seal ring 300 is divided into a plurality of parts, as shown in FIG. 5, the pressing force is uniform at a predetermined angle toward the center of the rotor shaft RS incorporated in the flexible packing ring A. (Box-shaped arrow in FIG. 5) can be generated, so that the sealing performance can be further improved as compared with the case where one movable seal ring 300 is formed in a semicircular shape.

  For this reason, the flexible packing ring A for a turbine of the present invention is formed by combining two seal ring housings 100 and 200, and one fixed seal ring 110 and 210 is attached to each seal ring housing 100 and 200. A plurality of movable seal rings 300 are attached to the fixed seal rings 110 and 210.

  Further, a stopper 500 is engaged with one end portion of each of the fixed seal rings 110 and 210, and the two fixed seal rings 110 and 210 to which the stopper 500 is engaged are engaged, whereby each fixed seal ring is engaged. A plurality of movable seal rings 300 are prevented from moving on both sides of 110 and 210.

As a result, the three unit seal rings 300a to 300c shown in FIG. 5 are constituted by the semicircular movable seal ring 300, and the two movable seal rings 300 are supported by the stopper 500 as shown in FIG. The two fixed seal rings 110 and 210 are engaged with each other.
As shown in FIG. 5, the elastic tool 400 is formed not only by the linear leaf spring 400 but also by the corrugated leaf spring 400 ′, and as shown in FIG. The same function and effect as the elastic tool 400 can be obtained by arranging a plurality of coiled springs 450.

On the other hand, as shown in FIG. 5, the movable seal ring may further include guide pins 600 whose both ends are fitted into at least two (three in FIG. 5) unit seal rings 300 a to 300 c.
As shown in FIGS. 5 and 6, the guide pin 600 is bent at one end and fixed to any one unit seal ring 300a, and the other end is slidable to the other unit seal ring 300b. It is inserted.

  For this reason, when the guide pin 600 is first attached, as shown in FIG. 6A, the two adjacent unit seal rings 300a and 300b are separated from each other. As shown in FIG. 6B, when pressed inward, the two unit seal rings 300a, 300b move inward, and the two adjacent unit seal rings 300a, 300b are moved by the guide pins 600. Guided and moved by interaction. Similarly, the guide pin 600 performs the same function when the two unit seal rings 300a and 300b move outward.

  Here, when there is one unit seal ring (for example, semicircular), it goes without saying that the unit seal ring and the movable seal ring are the same. As a result, the movable seal ring may indicate one unit seal ring itself, or may indicate a configuration in which two or more unit seal rings are engaged as necessary.

9 is a view showing a cross-sectional shape of the embodiment of the movable seal ring shown in FIG. 1, and FIG. 10 is a partially enlarged view showing an embodiment of the fixed seal ring corresponding to FIG. 9 (c). .
As shown in FIG. 9, the movable seal ring 300 can be variously changed according to the shape of the outer surface of the rotor shaft RS and the arrangement of the fixed triangular blades 111 and 112 formed on the first fixed seal ring 110. is there.

For example, as shown in FIG. 2, when the engagement position of the movable seal ring 300 is the formation position of the first fixed triangular blade 111, the movable body 310 of the movable seal ring 300 is movable as shown in FIG. A triangular blade 320 is formed.
According to another example, when the engagement position of the movable seal ring 300 is the formation position of the second fixed triangular blade 112, the movable body 310 of the movable seal ring 300 has a plurality of movable portions shown in FIG. A triangular blade 320 is formed.

According to still another embodiment, an inclined movable triangular blade 320 ′ is formed as shown in FIG.
In the case of (c) of FIG. 9, as shown in FIG. 10, it is formed when the fixed triangular blade 112 ′ of the first fixed seal ring 110 is inclined.
In addition, it goes without saying that the movable triangular blade 320 having various shapes can be formed according to the demands of those skilled in the art.

In the above, the flexible packing ring for turbines by this invention was demonstrated. The technical configuration of the present invention can be implemented in other specific forms by those skilled in the technical field to which the present invention belongs without changing the technical idea and essential features of the present invention. Can be understood.
Therefore, it should be understood that the above-described embodiment is illustrative in all aspects and not restrictive.

A: flexible packing ring 100: first seal ring housing 110: first fixed seal ring 111: first fixed triangular blade 112: second fixed triangular blade 113: insertion hole 114: retaining claw 200: second Seal ring housing 210: Second fixed seal ring 300: Movable seal ring 301: Fitting groove 310: Movable body 320: Movable triangular blade 330: Locking protrusion 400: Elastic tool 410: Fitting portion

To achieve the above object, a flexible packing ring for a turbine according to the present invention corresponds to a first seal ring housing formed in an arc shape corresponding to at least a part of a circle and at least another part of a circle. No second seal ring housing formed in an arc shape, are combined one round of the first stationary seal ring is engaged inside the first seal ring housing, the first fixed The seal ring is supported by being pressed inward by an elastic member provided in a space engaging with the first seal ring housing, and a second fixed seal ring is attached to the inside of the second seal ring housing. is, the second stationary seal ring, the inside by an elastic member provided in the space for engaging the second seal ring housing Is put is to support, the first stationary seal ring and the inner side of each of the second stationary seal rings, at least one movable sealing ring engaged, the respective movable seal ring, the inside by the elastic member It is engaged with the turbine rotor shaft with pressed against the condition characterized by Rukoto.

Claims (10)

A first seal ring housing formed in an arc shape corresponding to at least a part of a circle and a second seal ring housing formed in an arc shape corresponding to at least another part of the circle are combined to form one Make a circle,
A first fixed seal ring is engaged inside the first seal ring housing; a second fixed seal ring is engaged inside the second seal ring housing;
A flexible packing ring for a turbine, wherein at least one movable seal ring is engaged with each of the first fixed seal ring and the second fixed seal ring.   The first seal ring housing and the first fixed seal ring, the second seal ring housing and the second fixed seal ring, the first fixed seal ring and the movable seal ring, and the second The flexible packing ring for a turbine according to claim 1, wherein at least one of the fixed seal ring and the movable seal ring is slidably fitted in an arc direction. The movable seal ring is
Fitted from at least one of the first fixed seal ring and the second fixed seal ring;
The stopper of restricting the movement of the movable seal ring in the arc direction is provided at the other end portion of at least one of the first fixed seal ring and the second fixed seal ring. The flexible packing ring for turbines of 2. At least one of the first fixed seal ring and the second fixed seal ring is formed with an insertion hole into which the movable seal ring is slidably fitted in the inner and outer directions.
The flexible packing ring for a turbine according to claim 3, wherein the insertion hole is provided with an elastic member that presses the movable seal ring inward. At least one fitting groove is formed on the outer surface of the movable seal ring,
The flexible packing ring for a turbine according to claim 4, wherein the elastic tool is formed by a leaf spring in which a fitting portion to be fitted into the fitting groove is bent. The movable seal ring is
A movable body that is slid and fitted into an insertion hole formed in at least one of the first fixed seal ring and the second fixed seal ring;
A movable triangular blade protruding from the inner surface of the movable body;
The flexible packing ring for turbines according to any one of claims 1 to 5, characterized by comprising: At least one of the first fixed seal ring and the second fixed seal ring is formed with at least one retaining claw at an end portion inside the insertion hole,
The flexible packing ring for a turbine according to claim 6, wherein the movable seal ring is formed with a locking projection that is locked to the retaining claw. At least one fixed triangular blade is formed on the inner surface of at least one of the first fixed seal ring and the second fixed seal ring corresponding to the shape of the engagement surface of the rotor shaft,
The height of the movable triangular blade is higher than that of the fixed triangular blade by an amount corresponding to the size in which the movable body is inserted by the elastic tool provided in the insertion hole in a state where the movable triangular blade is provided on the rotor shaft. The flexible packing ring for a turbine according to claim 6, which is formed as described above. The inner surface of at least one of the first fixed seal ring and the second fixed seal ring has a first fixed triangular blade having different heights corresponding to the shape of the engaging surface of the rotor shaft, and a first 2 fixed triangular blades are formed,
The height of the movable triangular blade is provided in the insertion hole in a state of being provided on the rotor shaft as compared with any one of the first fixed triangular blade and the second fixed triangular blade. The flexible packing ring for a turbine according to claim 6, wherein the flexible packing ring is formed so as to be higher by an amount corresponding to a size in which the movable body is inserted by the elastic tool. At least two movable seal rings are provided,
Further provided with guide pins whose both ends fit into the two movable seal rings,
6. The process according to claim 1, wherein in the process of moving the movable seal ring inward or outward, the movement of two adjacent movable seal rings is guided by the interaction of the guide pins. The flexible packing ring for turbines of Claim 1.

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