JP5449976B2 - Shaft seal device, turbine device, and shaft seal device gap adjusting method - Google Patents

Description

  The present invention relates to a shaft seal device, a turbine device to which the shaft seal device is attached, and a shaft seal device gap adjusting method.

  For example, a turbine apparatus such as a steam turbine generally includes a rotor that rotates around an axis, a nozzle that is disposed outside the rotor and forms a steam flow path, and a casing that accommodates and fixes the nozzle.

  The nozzle is provided with a shaft seal device that covers almost the entire region in the circumferential direction of the rotor while maintaining a radial clearance from the outer circumferential surface of the rotor. As such a shaft seal device, for example, as disclosed in Patent Document 1, a shaft seal device provided with a labyrinth fin arranged so as to maintain a predetermined radial gap outside the rotor in the radial direction is known. It has been.

  The radial gap has a great influence on the performance of the turbine apparatus. For example, if the radial gap is larger than the design value, the amount of steam or the like leaking from the gap increases, and the efficiency decreases. On the other hand, if it is smaller than the design value, the rotor and the seal packing may come into contact with each other and abnormal vibration may occur and operation may not be possible. For this reason, assembling the radial gap as close as possible to the design value is an important task in efficiently operating the turbine apparatus.

JP 2008-297980 A

  In order to assemble the radial gap as designed, components such as a shaft seal device and a rotor are manufactured with high accuracy. However, when assembling each of these parts at the assembly site, it may be difficult to assemble (adjust) the radial gap as designed due to accumulation of errors of the parts.

  If the radial clearance is smaller than the allowable range of the design value, corrective processing is performed to slightly scrape the inner tip portion of the seal plate of the shaft seal device, that is, the portion that forms the radial clearance facing the outer peripheral surface of the rotor. The gap was adjusted to be large. On the other hand, if the radial clearance is larger than the allowable range, it may be necessary to rework the shaft seal device. Also, the shaft seal device may be replaced with another one. In either case, the time for assembly work increases, which may lead to an increase in cost.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to efficiently assemble a shaft seal device mounted on a turbine device.

In order to achieve the above object, each of the shaft seal devices according to the present invention is arranged between a rotor that rotates around an axis and a nozzle that is disposed radially outside the rotor to form a steam flow path. A plurality of arc seal portions configured to be engageable with a circumferential groove formed on the radially inner side of the nozzle, and when each arc seal portion is engaged with the circumferential groove, In the substantially ring-shaped shaft seal device configured to cover the outer peripheral surface of the rotor, each of the arc seal portions has an arc shape formed at a predetermined center angle, and at least a part of the circumferential groove is formed. A partial ring portion configured to be arranged radially inside, and a plurality of hooks provided at least radially outward of the partial ring portion and at both ends in the circumferential direction so as to be engageable with the circumferential groove. And the Each hook is composed of a plurality of circular arc plates, each of which is fixed to the inner side in the radial direction of the partial ring portion, and whose central angle is substantially the same arc shape as the partial ring portion and has a surface extending in the radial direction and the circumferential direction. When the portion engages with the circumferential groove, the circular arc plates are arranged at an interval in the axial direction, and the arc-shaped end portion on the inner side of the circular arc plate and the outer peripheral surface of the rotor The seal plate groups that are opposed to each other and are fixed so as to maintain a predetermined radial gap between each other are detachably attached to the inner side in the radial direction of each hook part and the outer side in the radial direction of the partial ring part, Gap adjustment composed of a plurality of shim materials capable of adjusting the radial distance between each hook portion and the partial ring portion, and configured such that the radial gap can be adjusted within a predetermined range by the number of inserted shim materials. Part , Have a, in addition to and circumferentially opposite ends radially outwardly of the partial ring portion, said hook portion and the gap adjusting unit is not provided, and wherein.

Further, the turbine apparatus according to the present invention includes a rotor that rotates around an axis, a nozzle that is disposed radially outside the rotor to form a steam flow path, and each of the rotor is radially inward of the nozzle. A plurality of arc seal portions disposed on the radially outer side and configured to be engageable with circumferential grooves formed on the radially inner side of the nozzle, wherein each arc seal portion is associated with the circumferential groove; And a substantially ring-shaped shaft seal device configured to cover the outer peripheral surface of the rotor when they are joined, each arc seal portion is formed at a predetermined center angle. A partial ring portion that is arcuate and at least partially configured to be disposed radially inward of the circumferential groove, and at least radially outward of the partial ring portion and provided at both circumferential ends. A plurality of hook portions configured to be engageable with the circumferential groove, and each of the hook portions is fixed radially inward of the partial ring portion, and the central angle is substantially the same arc shape as the partial ring portion in the radial direction and the circumferential direction. When each hook portion is engaged with the circumferential groove, the circular arc plates are arranged at an interval in the axial direction when the hook portions are engaged with the circumferential groove. A seal plate group in which arc-shaped end portions on the inner side of the arc flat plate face the outer peripheral surface of the rotor and are fixed so as to maintain a predetermined radial gap with each other, respectively, radially inward of each hook portion and It consists of a plurality of shim materials that are detachably attached to the outer side in the radial direction of the partial ring part and can adjust the radial distance between each of the hook parts and the partial ring part, and the radius depends on the number of the shim material inserted. Direction Gap have a, and adjustably configured gap adjusting unit within a predetermined range, in addition to and circumferentially opposite ends radially outwardly of the partial ring portion, the hook portion and the gap adjusting part is provided It is characterized by not.

Further, in the shaft seal device gap adjusting method according to the present invention, each of the shaft seal device gap adjusting methods is disposed between a rotor that rotates around an axis and a nozzle that is disposed radially outside the rotor to form a steam flow path, and A plurality of arc seal portions configured to be engageable with a circumferential groove formed on a radially inner side of the nozzle, and when the arc seal portions are engaged with the circumferential groove, the rotor In the method of adjusting the radial gap of the substantially ring-shaped shaft seal device configured to cover the rotor from the radial outer side while maintaining a predetermined radial gap with the outer circumferential surface of each of the circular arc seal portions, Is a circular arc formed at a predetermined center angle, and at least a part of the ring part is configured to be arranged radially inside the circumferential groove, and at least radially outside the part ring part and A plurality of hook portions provided at both ends in the direction and configured to be able to engage with the circumferential groove, each being fixed radially inward of the partial ring portion and having a central angle substantially the same as the partial ring portion The circular arc plate is formed of a plurality of circular arc plates formed with arc-shaped surfaces extending in the radial direction and the circumferential direction, and the arc flat plates are spaced apart from each other in the axial direction when the hook portions are engaged with the circumferential grooves. Seal plate groups that are arranged so as to be spaced apart from each other so that arc-shaped end portions on the inner sides of the respective arc flat plates are opposed to the outer peripheral surface of the rotor and maintain the radial gap with respect to each other. a parts and a plurality of shim material and detachably attached to the radially outer side of the partial ring portion radially inwardly of, and method for the adjustment, the respective arcuate seal portion, said circumferential groove Arc seal to insert After the insertion step, the radial seal measurement step for measuring the radial gap after the circular arc seal portion insertion step, and after the radial gap measurement step, based on the measurement result of the radial gap, the shim material inserted number is increased or decreased the, have a, a gap adjustment step of adjusting the radial gap, in addition to and circumferentially opposite ends radially outwardly of the partial ring portion, the hook portion and the gap adjusting unit It is characterized by not being provided .

  According to the present invention, it is possible to efficiently assemble a shaft seal device mounted on a turbine device.

It is a front view which shows the structure of 1st Embodiment of the shaft-seal apparatus which concerns on this invention. It is a II-II arrow partial sectional view of FIG. It is a front view of the 1st circular arc seal part of FIG. It is a schematic perspective view which shows the hook part etc. of FIG. FIG. 5 is a schematic side view of FIG. 4. It is a schematic perspective view which shows the state before attaching the hook part etc. of FIG. 2 shows a method of reducing the radial gap in FIG. 2, (a) is a front view of the first partial seal part before adjustment, and (b) is the first partial seal member of (a) in the circumferential groove. It is a side view which shows a state, (c) is a front view of the 1st partial seal part after adjustment, (d) is a side view which shows the state which the 1st partial seal member of (c) exists in a circumferential groove | channel. is there. 2 shows a method of increasing the radial gap in FIG. 2, (a) is a front view of the first partial seal portion before adjustment, and (b) is the first partial seal member of (a) in the circumferential groove. It is a side view which shows a state, (c) is a front view of the 1st partial seal part after adjustment, (d) is a side view which shows the state which the 1st partial seal member of (c) exists in a circumferential groove | channel. is there. FIGS. 3A and 3B are front views schematically showing a method for increasing the radial clearance on the upper side of the rotor of FIG. 2, in which FIG. FIG. 10 is a front view schematically showing a state in which the radial gap on the upper side of the rotor of FIG. 9A is adjusted to be small. FIG. 10 is a front view schematically showing a state where the radial gap on the right side of the rotor of FIG. 9A is adjusted to be large. FIG. 10 is a front view schematically showing a state in which the radial gap on the right side of the rotor of FIG. 9A is adjusted to be small. It is a schematic front view which shows typically the structure of 2nd Embodiment of the shaft-seal apparatus which concerns on this invention. It is a schematic front view which shows typically an example of the method of adjusting the radial direction gap of embodiment of FIG. It is a schematic front view which shows typically the structure of 3rd Embodiment of the shaft-seal apparatus which concerns on this invention. It is a schematic perspective view which shows the state in which the 1st center hook part etc. of embodiment of FIG. 15 are attached. It is a schematic front view which shows the 1st center hook part etc. of FIG.

  Hereinafter, embodiments of a shaft sealing device according to the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment of a shaft seal device according to the present invention will be described with reference to FIGS. FIG. 1 is a front view showing the configuration of the shaft seal device of the present embodiment. In FIG. 1, illustration of the rotor 1 is omitted. Further, detailed illustration of the outer side of the nozzle 21 in the radial direction is omitted. FIG. 2 is a partial cross-sectional view taken along the line II-II in FIG. In FIG. 2, detailed illustration of the radially outer side of the nozzle 21 is omitted.

  FIG. 3 is a front view of the first arc seal portion 11 of FIG. FIG. 4 is a schematic perspective view showing the hook portions 51a, 51b and the like of FIG. FIG. 5 is a schematic side view of FIG. FIG. 6 is a schematic perspective view showing a state before the hook portions 51a and 51b and the like of FIG. 4 are attached.

  7A and 7B show a method of reducing the radial gap 80 in FIG. 2, wherein FIG. 7A is a front view of the first partial seal portion before adjustment, and FIG. 7B is a view of the first partial seal member of FIG. It is a side view which shows the state in the direction groove | channel 22, (c) is a front view of the 1st partial seal part after adjustment, (d) is the 1st partial seal member of (c) in the circumferential direction groove | channel 22. It is a side view which shows a certain state. 8A and 8B show a method of increasing the radial gap 80 of FIG. 2, wherein FIG. 8A is a front view of the first partial seal portion before adjustment, and FIG. 8B is a view of the first partial seal member of FIG. It is a side view which shows the state in the direction groove | channel 22, (c) is a front view of the 1st partial seal part after adjustment, (d) is the 1st partial seal member of (c) in the circumferential direction groove | channel 22. It is a side view which shows a certain state.

  FIG. 9 is a front view schematically showing a method of increasing the radial gap 80 on the upper side of the rotor 1 of FIG. 2, wherein (a) shows a state before adjustment, and (b) shows a state after adjustment. FIG. 10 is a front view schematically showing a state in which the radial gap 80 on the upper side of the rotor 1 in FIG. 9A is adjusted to be small. FIG. 11 is a front view schematically showing a state in which the radial gap 80 on the right side of the rotor 1 in FIG. 9A is adjusted to be large. FIG. 12 is a front view schematically showing a state where the radial gap 80 on the right side of the rotor 1 in FIG. 9A is adjusted to be small. FIG. 9B and FIGS. 10 to 12 show only the first to fourth arc seal portions 11 to 14.

  First, the configuration of the shaft seal device of this embodiment will be described.

  This shaft seal device is attached to a turbine device such as a steam turbine, for example. Although not shown in detail, the turbine device extends horizontally and rotates around a horizontal axis (not shown), and is disposed outside the rotor 1 in the radial direction to form a steam flow path and the like. The nozzle 21 and a casing (not shown) for fixing the nozzle 21 while covering the nozzle 21 from the outside in the radial direction are provided.

  As shown in FIG. 1, the shaft seal device of the present embodiment has four arc seal portions, that is, a first arc seal portion 11, a second arc seal portion 12, a third arc seal portion 13, and a fourth arc seal. Part 14. As shown in FIG. 2, the first arc seal portion 11 is disposed radially outside the rotor 1 and radially inward of the nozzle 21, and a circumferential groove 22 formed inside the nozzle 21 in the radial direction. It is comprised so that engagement is possible. The second to fourth arc seal portions 12 to 14 are also configured in the same manner as the first arc seal portion 11. The shaft seal device has a substantially ring shape that covers substantially the entire circumferential direction of the outer peripheral surface of the rotor 1 when the first to fourth arc seal portions 11 to 14 are engaged with the circumferential groove 22. It is configured as follows.

  Although detailed illustration of the radially outer side of the nozzle 21 is omitted, the circumferential groove 22 described above is formed on the radially inner side of the nozzle 21, that is, on the rotor 1 side. The transverse section of the circumferential groove 22 is formed such that the axial width of the bottom portion on the radially outer side is larger than the axial width of the opening portion on the radially inner side. In the circumferential groove 22, hooking surfaces 23 facing outward in the radial direction are formed on both axial sides of the opening. That is, the cross-sectional shape of the circumferential groove 22 is a “T” shape. Each of the first to fourth arc seal portions 11 to 14 is engaged with the catching surface 23 of the circumferential groove 22. The engagement state will be described later.

  Further, the nozzle 21 is configured to be divided into two in the vertical direction. An opening is formed at the circumferential end of the circumferential groove 22 when the nozzle 21 is divided into two. The first to fourth arc seal portions 11 to 14 can be inserted from the opening.

  Here, the structure of the 1st circular arc seal part 11 is demonstrated in detail.

  As shown in FIG. 3, the first arc seal portion 11 includes a first partial ring portion 11a, a first hook portion 51a, a second hook portion 51b, a plurality of shim plates 45, and a first seal plate group 31. And having.

  The first partial ring portion 11a has an arc shape with a central angle of about 90 degrees. As shown in FIG. 4, the first partial ring portion 11a includes an axial projecting portion 41 projecting in the axial direction and a radial projecting portion 42 in the radial direction. As a result, the cross section is shaped like a T-shape. In the first partial ring portion 11 a, at least a part of the radial protrusion 42 can be disposed in the circumferential groove 22.

  As shown in FIG. 3, the first hook portion 51a is provided at one circumferential end of the first partial ring portion 11a, and the second hook portion 51b is provided on the side where the first hook portion 51a is provided. It is provided at the opposite circumferential end. As shown in FIGS. 4 and 5, the first hook portion 51 a has a substantially rectangular parallelepiped shape disposed on the radially outer side of the radial protrusion 42 of the first partial ring portion 11 a. As shown in FIG. 2, the substantially rectangular parallelepiped first hook portion 51 a is disposed so as to face and contact the catching surface 23 of the circumferential groove 22. The second hook portion 51b is configured similarly.

  Each of the first and second hook portions 51a and 51b engages with the hooking surface 23 while being in contact with each other. That is, the first arc seal portion 11 is configured to engage with the hooking surface 23 at four locations by the first and second hook portions 51a and 51b.

  Between each of the first and second hook portions 51a and 51b and the radial protrusion 42 of the first partial ring portion 11a, a plurality of shim plates 45 described later are disposed. Via these shim plates 45, the first hook portion 51a and the second hook portion 51b are respectively connected to the radial protrusion 42.

  Each of the first and second hook portions 51a and 51b is formed with a first through hole 5 penetrating in the radial direction, and each shim plate 45 is also formed with a second through hole (not shown). Further, as shown in FIG. 6, a screw hole 4 into which the bolt 6 is inserted is formed on the radially outer side of the radial projecting portion 42 with which the first and second hook portions 51a and 51b are in contact.

  The bolt 6 inserted from the first through hole 5 passes through the second through hole and is attached to the screw hole 4 of the radial protrusion 42, whereby each of the first and second hook portions 51a and 51b is in the radial direction. The protrusion 42 is fixed. At this time, as described above, the axially opposite sides of the first and second hook portions 51a and 51b are kept in contact with the hooking surface 23.

  Further, a leaf spring 71 or the like is disposed between the radially outer surfaces of the first and second hook portions 51a and 51b and the bottom of the circumferential groove 22, and the leaf spring 71 causes the first and first hook portions 51a and 51b to be disposed between the first and second hook portions 51a and 51b. Each of the two hook portions 51a and 51b is connected to the bottom of the circumferential groove 22 so as to be movable in the radial direction.

  A plurality of seal plates 30 are attached to the inside of the first partial ring portion 11a in the radial direction, that is, the inside of the axially extending portion 41 in the radial direction. Each of these seal plates 30 is an arc-shaped flat plate in which a central angle is an arc shape of 90 degrees that is substantially the same as that of the first partial ring portion 11a, and surfaces that extend in the radial direction and the circumferential direction are formed. These seal plates 30 constitute a first seal plate group 31.

  When the first and second hook portions 51a and 51b are engaged with the catching surface 23 of the circumferential groove 22, the seal plates 30 of the first seal plate group 31 are spaced apart from each other in the axial direction. Are arranged. At this time, the arc-shaped end portions on the inner sides of the respective seal plates 30 are fixed so as to face the outer peripheral surface of the rotor 1 and maintain a predetermined radial gap 80 therebetween.

  The shaft seal device of this embodiment is a labyrinth seal. That is, each seal plate 30 constituting the first seal plate group 31 has two types, one having a long radial direction and one having a short radial direction. The outer peripheral surface of the rotor 1 facing the seal plate 30 having a short radial length is formed so as to project outward in the radial direction. That is, although the details of the surface shape of the rotor 1 of the present embodiment are omitted, the portion facing the seal plate 30 is uneven in the axial direction.

  On the other hand, when each of the first and second hook portions 51a and 51b is engaged with the circumferential groove 22, between the first and second hook portions 51a and 51b on the radially outer side of the first partial ring portion 11a. Is formed with a safety hook portion 61 having a pre-engagement surface 61a formed on the hooking surface 23 so as to keep a predetermined gap in the radial direction. The safety hook portion 61 is formed integrally with the first partial ring portion 11a.

  The safety hook portion 61 is configured to be able to engage with the hooking surface 23 in place of the hook portions 51a and 51b when the hook portions 51a and 51b are broken or detached from the radially projecting portion 42. Even when the engagement between the first hook portion 51a and the second hook portion 51b and the hooking surface 23 is released, the force that the seal plates 30 press the outer peripheral surface of the rotor 1 acts. Can be suppressed.

  Then, the structure of the 2nd-4th circular arc seal parts 12-14 is demonstrated.

  The second arc seal portion 12 is configured in the same manner as the first arc seal portion 11, and includes a second partial ring portion 12a and third hook portions 52a provided at both circumferential ends of the second partial ring portion 12a. And a fourth hook portion 52b, a plurality of shim plates 45, a second seal plate group 32, and a safety hook portion 61.

  Similarly, the third arc seal portion 13 includes a third partial ring portion 13a, a fifth hook portion 53a and a sixth hook portion 53b provided at both circumferential ends of the third partial ring portion 13a, and a plurality of A shim plate 45, a third seal plate group 33, and a safety hook portion 61 are included. The fourth arc seal portion 14 includes a fourth partial ring portion 14a, a seventh hook portion 54a and an eighth hook portion 54b provided on each circumferential end of the fourth partial ring portion 14a, and a plurality of shim plates 45. And a fourth seal plate group 34 and a safety hook portion 61.

  As shown in FIG. 2, the second arc seal portion 12 is arranged to be adjacent to the first hook portion 51 a of the first arc seal portion 11 in the circumferential direction with a circumferential gap therebetween. The third arc seal portion 13 is arranged so as to be adjacent to the third hook portion 52a of the second arc seal portion 12 in the circumferential direction with a circumferential gap therebetween. The fourth arc seal portion 14 is arranged so as to be adjacent to the fifth hook portion 53a of the third arc seal portion 13 in the circumferential direction with a circumferential gap therebetween. Accordingly, as described above, the first to fourth arc seal portions 11 to 14 cover almost the entire area of the outer peripheral surface of the rotor 1 in the circumferential direction.

  Note that the circumferential gap formed between the arc seal portions 11 to 14 absorbs this deformation even when the arc seal portions 11 to 14 are deformed by thermal expansion or the like while the turbine device is in operation. The radial gap 80 can be kept within a predetermined range.

  Below, the adjustment method of the radial direction gap | interval 80 formed between the sealing board 30 and the outer peripheral surface of the rotor 1 with the shaft seal apparatus of this embodiment is demonstrated.

  First, adjustment of the first arc seal portion 11 will be described.

  As shown in FIGS. 7A and 7B, when the radial gap 80 (t1 in FIG. 7B) is larger than the allowable range of the design value, as shown in FIGS. 7C and 7D. Further, the number of shim plates 45 is increased and the radial gap 80 is adjusted to be t2 smaller than t1.

  Further, as shown in FIGS. 8A and 8B, when the radial gap 80 (t3 in FIG. 8B) is smaller than the allowable range of the design value, it is shown in FIGS. 8C and 8D. As shown, the number of shim plates 45 is reduced and the radial gap 80 is adjusted to be a small t4 larger than t3.

  Next, the case where the radial direction gap | interval 80 of the 1st-4th circular arc seal parts 11-14 is adjusted is demonstrated.

  As shown in FIG. 9A, the first to fourth arc seal portions 11 to 14 are engaged with the circumferential groove 22 and assembled so as to cover the outer peripheral portion of the rotor 1 while maintaining the radial gap 80. The radial gap 80 is measured. At this time, when the radial clearance 80 on the upper side of the rotor 1 is smaller than the allowable range of the design value, the number of shim plates 45 attached to the first hook portion 51a of the first arc seal portion 11 and the second arc seal. The number of shim plates 45 attached to the fourth hook portion 52b of the portion 12 is reduced by a predetermined amount. As a result, as shown in FIG. 9 (b), the first and second arc seal portions 12 move upward from the time of assembly, so the radial gap 80 on the upper side of the rotor 1 is larger than that at the time of assembly. Can be adjusted.

  When the first to fourth arc seal portions 11 to 14 are assembled as described above and the radial gap 80 is measured, the radial gap 80 on the upper side of the rotor 1 is larger than the allowable range of the design value. Sometimes, the number of shim plates 45 attached to the first hook portion 51a of the first arc seal portion 11 and the number of shim plates 45 attached to the fourth hook portion 52b of the second arc seal portion 12 are respectively set to predetermined values. Increase by the amount. As a result, as shown in FIG. 10, the first and second arc seal portions 12 move downward as compared with the time of assembly, so that the radial gap 80 on the upper side of the rotor 1 becomes smaller than that during the assembly. Can be adjusted.

  Further, when the first to fourth arc seal parts 11 to 14 are assembled as described above and the radial gap 80 is measured, the radial gap 80 on the right side of the rotor 1 is smaller than the allowable range of the design value. Sometimes, the number of shim plates 45 attached to the second hook portion 51b of the first arc seal portion 11 and the number of shim plates 45 attached to the seventh hook portion 54a of the fourth arc seal portion 14 are respectively set to predetermined values. Reduce by the amount. As a result, as shown in FIG. 11, the first and fourth arc seal portions 14 move to the right rather than when assembled, so that the radial gap 80 on the right side of the rotor 1 becomes larger than when assembled. Can be adjusted.

  Further, when the first to fourth arc seal portions 11 to 14 are assembled as described above and the radial gap 80 is measured, the radial gap 80 on the right side of the rotor 1 is larger than the allowable range of the design value. Sometimes, the number of shim plates 45 attached to the second hook portion 51b of the first arc seal portion 11 and the number of shim plates 45 attached to the seventh hook portion 54a of the fourth arc seal portion 14 are respectively set to predetermined values. Increase by the amount. As a result, as shown in FIG. 12, the first and fourth arc seal portions 14 move to the left rather than when assembled, so that the radial gap 80 on the right side of the rotor 1 becomes smaller than when assembled. Can be adjusted.

  Further, when adjusting the radial gap 80 between the first hook portion 51a and the second hook portion 51b, the number of shim plates 45 attached to the first hook portion 51a and the second hook portion 51b are attached. The number of shim plates 45 is adjusted. Between the third hook portion 52a and the fourth hook portion 52b, between the fifth hook portion 53a and the sixth hook portion 53b, and between the seventh hook portion 54a and the eighth hook portion 54b, the respective radial gaps 80 are set. Adjustments can be made as well.

  As can be seen from the above description, when the shaft seal device of this embodiment is attached to the turbine device, the number of shim plates 45 can be adjusted to adjust both the enlarged side and the narrow side with high accuracy. It is. For this reason, it becomes possible to suppress the process of shaving and adjusting the seal plate 30 as in the prior art, and the shaft seal device can be assembled efficiently.

  Further, since the hook portions 51a to 54b are in contact with the catching surface 23 of the circumferential groove 22, the shaft seal device can be easily fixed to the nozzle.

  Moreover, since the shaft seal device of the present embodiment is divided into four parts, that is, has the first to fourth arc seal portions 11 to 14, the radial gap 80 is adjusted in each arc seal portion. Therefore, it is possible to adjust more accurately and efficiently.

[Second Embodiment]
A second embodiment of the shaft seal device according to the present invention will be described with reference to FIGS. 13 and 14. FIG. 13 is a schematic front view schematically showing the configuration of the shaft seal device of the present embodiment. FIG. 14 is a schematic front view schematically showing an example of a method for adjusting the radial gap 80 of FIG. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  The shaft seal device of this embodiment includes six arc seal portions, that is, a first arc seal portion 11, a second arc seal portion 12, a third arc seal portion 13, a fourth arc seal portion 14, and a first arc seal portion. 5 arc seal portion 15 and sixth arc seal portion 16.

  The first arc seal portion 11 has an arc shape with a central angle of about 60 degrees, and a first hook portion 51a and a second hook portion 51b are provided at both ends of the arc as in the first embodiment. A safety hook 61 is formed between the first hook 51a and the second hook 51b.

  When the first to sixth arc seal portions 11 to 16 are assembled in a ring shape as shown in FIG. 13 and the radial gap 80 is measured, the radial gap 80 on the upper side of the rotor 1 is allowed to have a design value tolerance. When larger than the range, the number of shim plates 45 attached to the first hook portion 51a and the second hook portion 51b of the first arc seal portion 11 and the hook portion adjacent to the first hook portion 51a in the circumferential direction are set. The number of shim plates 45 attached and the number of shim plates 45 attached to the hook portions adjacent to the second hook portion 51b in the circumferential direction are increased by a predetermined amount. As a result, as shown in FIG. 14, the first and second arc seal portions 11, 12 and the like move downward as compared with the time of assembly, so the radial gap 80 on the upper side of the rotor 1 is smaller than that during the assembly. Can be adjusted.

  According to this embodiment, it is possible to adjust the radial gap 80 with higher accuracy than in the first embodiment.

[Third Embodiment]
A third embodiment of the shaft seal device according to the present invention will be described with reference to FIGS. FIG. 15 is a schematic front view schematically showing the configuration of the shaft seal device of the present embodiment. FIG. 16 is a schematic perspective view showing a state where the first central hook portion 51c and the like of FIG. 15 are attached. FIG. 17 is an enlarged front view showing the first central hook portion 51c and the like of FIG. In addition, this embodiment is a modification of 1st Embodiment, Comprising: The same code | symbol is attached | subjected to the same part or similar part as 1st Embodiment, and duplication description is abbreviate | omitted.

  When steam or the like flows through the nozzle 21, a pressure difference is generated between the upstream side and the downstream side of the shaft seal device. This differential pressure may cause the shaft seal device to bend in the axial direction. Due to this bending, the radial gap 80 of the bent arc seal portion may deviate from a predetermined range.

  In the present embodiment, as shown in FIG. 15, a first central hook portion 51 c is provided between the first hook portion 51 a and the second hook portion 51 b of the first arc seal portion 11. The first central hook portion 51c is configured in the same manner as the first hook portion 51a and the like, and a plurality of shim plates 45 are attached thereto.

  Similarly to the first arc seal portion 11, the second to fourth arc seal portions 12 to 14 are respectively provided with a second center hook portion 52c, a third center hook portion 53c, and a fourth center hook portion 54c. ing.

  The first to fourth central hook portions 51c to 54c provided on the respective arc seal portions 11 to 14 when the circumferential center portions of the respective arc seal portions 11 to 14 are bent by the above-described differential pressure. Therefore, since it is fixed to the catching surface 23, it becomes possible to suppress bending. As a result, it is possible to adjust the radial gap 80 with higher accuracy than in the first embodiment.

[Other Embodiments]
The description of the above embodiment is an example for explaining the present invention, and does not limit the invention described in the claims. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

  For example, the shaft sealing device of the first and second embodiments includes four arc seal portions, and the third embodiment includes six arc seal portions, but is not limited thereto. For example, you may comprise by eight or more circular arc seal parts.

  Moreover, although the leaf | plate spring 71 for connecting the bottom part of the nozzle 21 and a shaft seal apparatus is attached to the hook part, it is not restricted to this. You may provide in the radial direction outer side of the safety hook part 61. FIG.

DESCRIPTION OF SYMBOLS 1 ... Rotor, 4 ... Screw hole, 5 ... 1st through-hole, 6 ... Bolt, 11 ... 1st circular arc seal part, 11a ... 1st partial ring part, 12 ... 2nd circular arc seal part, 12a ... 2nd partial ring 13, a third arc seal portion, 13 a, a third partial ring portion, 14, a fourth arc seal portion, 14 a, a fourth partial ring portion, 15, a fifth arc seal portion, 16, a sixth arc seal portion, 21 ... Nozzle, 22 ... Circumferential groove, 23 ... Hook surface, 30 ... Seal plate, 31 ... First seal plate group, 32 ... Second seal plate group, 33 ... Third seal plate group, 34 ... Fourth seal Plate group 41... Axial overhanging portion 42... Radial projecting portion 45. Shim plate 51 a... First hook portion 51 b ... Second hook portion 51 c ... First central hook portion 52 a. Part, 52b ... fourth hook part, 52c ... second central hook part, 53a ... fifth hook part 53b ... 6th hook part, 53c ... 3rd center hook part, 54a ... 7th hook part, 54b ... 8th hook part, 54c ... 4th center hook part, 61 ... Safety hook part, 61a ... Pre-engagement surface, 71 ... leaf spring, 80 ... radial gap

Claims (10)

Each is disposed between a rotor that rotates about an axis and a nozzle that is disposed radially outward of the rotor to form a steam flow path, and is associated with a circumferential groove formed radially inward of the nozzle. Comprising a plurality of arc seal portions configured to be compatible,
In the substantially ring-shaped shaft seal device configured to cover the outer peripheral surface of the rotor when each arc seal portion is engaged with the circumferential groove,
Each of the arc seal portions is
A partial ring portion configured to be arcuately formed at a predetermined center angle, and at least a part of which can be arranged on the radially inner side of the circumferential groove;
A plurality of hook portions provided at least radially outward of the partial ring portion and at both ends in the circumferential direction and configured to be able to engage with the circumferential groove;
Each of the hook portions is composed of a plurality of circular arc plates, each of which is fixed to the inner side in the radial direction of the partial ring portion, and whose center angle is substantially the same arc shape as the partial ring portion, and has a surface extending in the radial direction and the circumferential direction. Are engaged with the circumferential groove, the circular arc plates are arranged at an interval in the axial direction, and the arcuate ends inside the circular arc plates face the outer peripheral surface of the rotor. A group of seal plates fixed so as to maintain a predetermined radial gap with each other;
A plurality of each of which is detachably attached to the inside of each hook portion in the radial direction and the outside of the partial ring portion in the radial direction so that the radial distance between each of the hook portions and the partial ring portion can be adjusted. A gap adjusting portion made of shim material, and configured such that the radial gap can be adjusted within a predetermined range by the number of inserted shim materials;
I have a,
The hook part and the gap adjustment part are not provided at the outer side in the radial direction of the partial ring part and at both ends in the circumferential direction.
A shaft seal device. The transverse cross section of the circumferential groove is formed such that the axial width of the bottom portion on the radially outer side is larger than the axial width of the opening portion on the radially inner side, and the opening in the circumferential groove is formed in the circumferential groove. A hooking surface facing the radially outer side is formed on each of both axial sides,
The hook portion is configured to engage with each of the hooking surfaces;
The shaft seal device according to claim 1.   3. The shaft seal device according to claim 2, wherein each of the hook portions is a substantially rectangular parallelepiped, and is configured such that a radially inner surface engages with each of the hooking surfaces while being in contact therewith. . When the hook portion is engaged with the circumferential groove, the arc seal portion is mutually connected to the hooking surface between the hooks in the circumferential groove and radially outward of the partial ring portion. A spare hook portion having a surface formed so as to maintain a radial interval is formed;
The shaft seal device according to claim 2 or 3, wherein Each hook part is formed with a first through hole penetrating in the radial direction,
A screw hole is formed in a portion where the hook portion is arranged on the outer side in the radial direction of the partial ring portion,
A second through hole penetrating in the radial direction is formed in the sealing material,
The seal material is attached by a bolt inserted from the first through hole being fixed to the screw hole through the second through hole;
The shaft seal device according to any one of claims 1 to 4, wherein The shaft seal device according to any one of claims 1 to 5, wherein a central angle of the partial ring portion is 90 degrees . The shaft seal device according to any one of claims 1 to 5, wherein a central angle of the partial ring portion is 60 degrees . The elastic member which connects the bottom part of the said circumferential groove | channel and the site | part which does not have the said hook part in the radial direction outer side of the said partial ring member is arrange | positioned, The any one of Claim 1 thru | or 7 characterized by the above-mentioned. shaft sealing apparatus according to an item or. A rotor that rotates around an axis;
A nozzle disposed radially outside the rotor to form a steam flow path;
Each includes a plurality of arc seal portions arranged radially inward of the nozzle and radially outward of the rotor and configured to be engageable with circumferential grooves formed on the radially inner side of the nozzle. A substantially ring-shaped shaft seal device configured to cover the outer peripheral surface of the rotor when each arc seal portion is engaged with the circumferential groove;
In a turbine apparatus having
Each of the arc seal portions is
A partial ring portion configured to be arcuately formed at a predetermined center angle, and at least a part of which can be arranged on the radially inner side of the circumferential groove;
A plurality of hook portions provided at least on the radially outer side of the partial ring portion and at both ends in the circumferential direction and configured to be able to engage with the circumferential groove;
Each of the hook portions is composed of a plurality of circular arc plates, each of which is fixed to the inner side in the radial direction of the partial ring portion, and whose center angle is substantially the same arc shape as the partial ring portion, and has a surface extending in the radial direction and the circumferential direction. Are engaged with the circumferential groove, the circular arc plates are arranged at an interval in the axial direction, and the arcuate ends inside the circular arc plates face the outer peripheral surface of the rotor. A group of seal plates fixed so as to maintain a predetermined radial gap with each other;
A plurality of each of which is detachably attached to the inside of each hook portion in the radial direction and the outside of the partial ring portion in the radial direction so that the radial distance between each of the hook portions and the partial ring portion can be adjusted. A gap adjusting portion made of shim material, and configured such that the radial gap can be adjusted within a predetermined range by the number of inserted shim materials;
Have
The hook part and the gap adjustment part are not provided at the outer side in the radial direction of the partial ring part and at both ends in the circumferential direction.
Turbine device characterized by this . Each is disposed between a rotor that rotates about an axis and a nozzle that is disposed radially outward of the rotor to form a steam flow path, and is associated with a circumferential groove formed radially inward of the nozzle. Comprising a plurality of arc seal portions configured to be compatible,
A substantially ring shape configured to cover the rotor from the outer side in the radial direction while maintaining a predetermined radial gap with the outer peripheral surface of the rotor when each arc seal portion is engaged with the circumferential groove. In the method of adjusting the radial clearance of the shaft seal device of
Each of the arc seal portions is
A partial ring portion configured to be arcuately formed at a predetermined center angle, and at least a part of which can be arranged on the radially inner side of the circumferential groove;
A plurality of hook portions provided at least radially outward of the partial ring portion and at both ends in the circumferential direction and configured to be able to engage with the circumferential groove;
Each of the hook portions is composed of a plurality of circular arc plates, each of which is fixed to the inner side in the radial direction of the partial ring portion, and whose center angle is substantially the same arc shape as the partial ring portion, and has a surface extending in the radial direction and the circumferential direction. Are engaged with the circumferential groove, the circular arc plates are arranged at an interval in the axial direction, and the arcuate ends inside the circular arc plates face the outer peripheral surface of the rotor. And a seal plate group fixed so as to maintain the radial gap with each other;
A plurality of shim members each detachably attached to the inner side in the radial direction of each hook part and the outer side in the radial direction of the partial ring part;
Have
The adjustment method is
An arc seal portion insertion step of inserting each arc seal portion into the circumferential groove;
After the arc seal portion insertion step, a radial gap measurement step for measuring the radial gap,
After the radial gap measurement step, based on the measurement result of the radial gap, the gap adjustment step of adjusting the radial gap by increasing or decreasing the number of inserted shim materials;
Have
The hook part and the gap adjustment part are not provided at the outer side in the radial direction of the partial ring part and at both ends in the circumferential direction.
A method for adjusting a clearance of a shaft seal device characterized by the above .

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