JP4690775B2 - High pressure cabin water pressure test structure and water pressure test method - Google Patents

Description

  The present invention relates to a water pressure test structure and a water pressure test method for a high-pressure casing such as a steam turbine.

  Since the casing of a steam turbine (especially a high-pressure turbine) is a high-pressure vessel, it is necessary to perform a water pressure test defined by law. The purpose of this water pressure test is to prevent accidents such as rupture of the high-pressure compartment. By applying water pressure to the high-pressure compartment, it is confirmed that the high-pressure compartment meets the required standards. Yes.

  Normally, in order to perform this water pressure test, as shown in FIG. 7, a partition wall 71 is installed at an appropriate position in the high-pressure casing 70 in a state where the rotor is not mounted. The lower passenger compartment 73 is assembled, and then a water pressure test is performed by injecting water at a predetermined pressure.

  In this water pressure test, the sealing performance between the high-pressure casing 70 and the partition wall 71 becomes a problem. Therefore, as shown in FIG. 7, conventionally, before supplying water for the hydraulic pressure test, it is necessary to press each partition wall 71 against the side surface of the high-pressure turbine. The partition walls 71 having the highest water pressure at the time of the water pressure test are fixed to each other by providing both screw bolts 74 in the axial direction (axial direction of the rotor). And a tension bolt 76 and a hydraulic jack (not shown) are provided, and the tension bolt 76 or hydraulic tension is applied and fixed.

  In order to ensure the sealing property between the partition wall 71 and the high-pressure casing 70, an O-ring (not shown) is provided in the gap (the surface in the rotor radial direction) between the partition wall 71 and the high-pressure casing 70. .

  In addition, since the tension bolt 76 and the hydraulic jack must be operated after the partition wall 71 is installed in the high-pressure casing 70, a manhole 75 is provided in the outer partition wall 71 for workers to enter and exit. An example of such a water pressure test structure of the high-pressure casing 70 is disclosed in Patent Document 1 below.

JP 56-43531 A

  As described above, in the conventional hydraulic pressure test structure, after all the partition walls 71 are installed in the high pressure casing 70, an operator enters the inside of the high pressure casing 70 through the manhole 75 provided in the outer partition wall 71, and the tension bolt 76. In addition, since the operation of the hydraulic jack has to be performed, much labor is required.

  Further, even if the installation position of the partition wall 71 is slightly deviated from the predetermined installation position, the sealing performance of the O-ring is remarkably deteriorated. Therefore, fine adjustment is required for the installation position of the partition wall 71 and the operation of the tension bolt 76 and the hydraulic jack. Was required and the work was complicated.

  Accordingly, an object of the present invention is to provide a water pressure test structure and a water pressure test method for a high pressure cabin so that an operator does not have to enter and exit the high pressure cabin after combining the upper and lower high pressure cabins. To do.

A water pressure test structure for a high-pressure casing according to a first invention (corresponding to claim 1) for solving the above-described problems is as follows.
A high-pressure cabin to be tested,
A plurality of partition walls that match fit with the inner wall of the high pressure casing,
A plurality of spaces formed by the high-pressure casing and the plurality of partition walls;
A piston O-ring that is circumferentially provided on the radial side surface of the partition wall and fitted into the first groove portion so as to contact the inner wall of the high-pressure casing;
An end face O-ring that is provided with a second groove portion on the side surface in the radial direction of the partition wall that presses the inner wall of the high-pressure casing due to a water pressure difference of water injected into the space, and is fitted into the second groove portion. It has a door,
Characterized Rukoto written water pressure to fitting the partition wall by a gap of the high-pressure casing and the partition wall.

  A hydraulic test structure for a high-pressure casing according to a second invention (corresponding to claim 2) for solving the above-described problem is the hydraulic test structure for a high-pressure casing according to the first invention, wherein the axial direction of the partition wall An alignment mechanism for adjusting the axial installation position of the partition wall is provided on the side surface of the partition wall.

  A water pressure test method for a high-pressure casing according to a third invention (corresponding to claim 3) for solving the above-described problems is the water pressure test structure for a high-pressure casing according to the first invention or the second invention. Water is injected into a space partitioned by the partition wall, and the partition wall is pressed against an inner wall of the high-pressure casing by the pressure of the water.

  According to the first invention, a plurality of partition walls are provided in the high-pressure vehicle cabin to be tested, a circumferential groove is provided on a radial side surface of the partition wall, and a piston O-ring in contact with the inner wall of the high-pressure cabin is provided in the groove portion. By providing a space for supplying pressurized water between the high pressure casing and the partition wall, an appropriate water pressure is applied to the partition wall due to the fitting gap between the high pressure casing and the partition wall. The sealing performance of the O-ring can be maintained without using a jack.

  According to the second aspect of the invention, by providing the alignment mechanism for adjusting the radial installation position of the partition wall on the side surface in the axial direction of the partition wall, the installation position of the partition wall can be finely adjusted by the alignment mechanism. Even if there is a slight shift in the rotor axial direction due to the water pressure, the clearance between each partition wall and the inner peripheral surface of the high-pressure casing is kept substantially constant, so that the sealing performance of the O-ring can be maintained.

  According to the third invention, water is injected into the space partitioned by the partition, the pressure of the water acts on the piston O-ring, and the partition is pressed against the inner wall of the high-pressure casing. Thereby, the sealing performance of the O-ring can be maintained without performing the work with the tension bolt and the hydraulic jack, which has been performed to press the partition wall against the high-pressure casing.

  A water pressure test structure for a high-pressure casing according to the present invention will be described with reference to FIGS. 1 is a vertical sectional view of a high-pressure casing of a steam turbine. FIG. 2 is a vertical sectional view of a first partition wall end. FIG. 3 is a vertical sectional view of a second partition wall end. 4 is a cross-sectional view of the end of the third partition wall in the vertical direction, FIG. 5 is a cross-sectional view of the end of the fourth partition wall in the vertical direction, and FIG. 6 is a plan view of the first partition on the first section side.

  First, the outline of the water pressure test structure of the high-pressure casing of the steam turbine according to the present embodiment will be described. As shown in FIG. 1, the high pressure casing 1 of the steam turbine is divided into a lower casing 2 and an upper casing 3, and the upper casing 3 of the steam turbine is covered with the lower casing 2 from above. Is forming.

  Both ends in the axial direction of the high-pressure casing 1 of the steam turbine are openings, and lids are provided at these openings. Here, the lid provided in the larger opening is referred to as the large lid 4a, and the lid provided in the smaller opening is referred to as the small lid 4b. The lower passenger compartment 2 and the upper passenger compartment 3 are united with the large lid 3 and the small lid 4 by bolts or the like.

  The inside of the high-pressure casing 1 of the steam turbine is divided into six areas for applying different hydraulic test pressures. These areas are referred to as a first area A, a second area B, a third area C, a fourth area D, a fifth area E, and a sixth area F in this order from the large lid 4a side. The water pressure in each area is highest in the fourth area D, and the water pressure is lower in the order of the fifth area E, the third area C, the second area B, the first area A, and the sixth area F.

  A disc-shaped partition wall for separating each area is provided on the boundary surface between the first area A and the sixth area F. Five partition walls are provided inside the high-pressure casing 1 of the steam turbine, the partition walls separating the first section A and the second section B are the first partition wall 5, and the second partition wall B and the third section C are separated by the second partition wall. The partition wall 6, the partition wall separating the third section C and the fourth section D, the third partition wall 7, the partition wall separating the fourth section D and the fifth section E as the fourth partition wall 8, the fifth section E and the sixth section F. A partition wall for isolating is defined as a fifth partition wall 9. Although five partition walls are provided in this embodiment, the number of partition walls can be changed depending on the structure of the high-pressure casing 1.

  Next, the structure of the first to fifth partition walls will be described. As shown in FIG. 2, the radial side surface of the first partition wall 5 has a substantially convex shape, and is shaped so as to be substantially fitted to the wall surface of the high-pressure casing 1. A groove portion 20 is provided circumferentially on the first section A side of the convex portion on the side surface in the radial direction of the first partition wall 5, and the end surface O-ring 10 is fitted into the groove portion 20. In addition, a groove portion 21 is provided in a circumferential shape on the first section A side and the second section side B side of the side surface in the radial direction of the first partition wall 5, and the piston O-ring 11 is fitted and installed in the groove portion 21.

  As shown in FIG. 1, a screw groove 5 a for attaching a member for lifting the first partition wall 5 when the first partition wall 5 is installed in the lower passenger compartment 2 is provided on the side surface in the radial direction of the first partition wall 5. This is mainly for adjusting the position in the vertical direction (radial direction). In addition, a screw groove 5b for attaching a member for lifting the first partition wall 5 when the first partition wall 5 is installed in the lower passenger compartment 2 is also provided at a lower portion of the side surface of the first partition wall 5 on the first section A side. This is mainly for lifting and reversing the first partition wall 5.

  When installing the first partition 5 in the passenger compartment 2 at the end of the side surface (side surface in the axial direction) on the first section A side and the second section B side of the first partition wall 5, An installation position adjustment bracket 12 for adjustment is provided. As shown in FIG. 6, the installation position adjustment bracket 12 is provided with a screw groove 12 a through which the installation position adjustment bolt 12 b can penetrate in the radial direction, and the tip of the penetrated installation position adjustment bolt 12 b is connected to the lower compartment 2. Make contact. In this embodiment, the installation position adjustment bracket 12 and the installation position adjustment bolt 12b are the alignment mechanism.

  As shown in FIG. 3, the radial side surface of the second partition wall 6 has a substantially convex shape and is shaped so as to be substantially fitted to the wall surface of the high-pressure casing 1. A groove portion 30 is provided circumferentially on the second section B side of the convex portion on the side surface in the radial direction of the second partition wall 6, and the end face O-ring 10 is fitted and installed in the groove portion 30. Further, a groove portion 31 is provided in a circumferential shape on the second section B side and the third section C side of the side surface in the radial direction of the second partition wall B, and the piston O-ring 11 is fitted and installed in the groove section 31.

  As shown in FIG. 1, a screw groove 6 a for attaching a member for lifting the second partition wall 6 when the second partition wall 6 is installed in the lower passenger compartment 2 is provided on the side surface in the radial direction of the second partition wall 6. This is mainly for adjusting the position in the vertical direction (radial direction). Further, a screw groove 6b for attaching a member for lifting the second partition wall 6 when the second partition wall 6 is installed in the lower passenger compartment 2 is also provided at the lower portion of the side surface of the second partition wall 6 on the second section B side. This is mainly for lifting and reversing the second partition wall 6.

  When the second partition wall 6 is installed in the lower passenger compartment 2 at the end of the second partition wall 6 on the side of the second section B and the third section C side (side surface in the axial direction), the installation position of the second partition wall 6 is determined. An installation position adjustment bracket 13 for adjustment is provided. Similar to the first partition wall 5, the installation position adjustment bracket 13 is provided with a thread groove 13 a through which an installation position adjustment bolt (not shown) can penetrate in the radial direction. Make contact with the lower passenger compartment 2.

  As shown in FIG. 4, the radial side surface of the third partition wall 7 has a substantially concave shape, and is shaped so as to be substantially fitted to the wall surface of the high-pressure casing 1. A groove portion 40 is provided circumferentially on the fourth section D side of the concave portion on the side surface in the radial direction of the third partition wall 7, and the end surface O-ring 10 is fitted into the groove portion 40. Further, a groove portion 41 is provided in a circumferential shape in a concave portion on a side surface in the radial direction of the third partition wall 7, and the piston O-ring 11 is fitted into the groove portion 41 and installed.

  As shown in FIG. 1, when the third partition wall 7 is installed in the lower compartment 2 on the upper portion of the side surface on the third section C side and the upper portion of the side surface on the fourth section D side of the third partition wall 7. A screw groove 7a is provided for attaching a member for lifting up the cable. This is mainly for adjusting the position in the vertical direction (radial direction). Further, a screw groove 7b for attaching a member for lifting the third partition wall 7 when the third partition wall 7 is installed in the lower passenger compartment 2 is also provided at a lower portion of the side surface of the third partition wall 7 on the third section C side. This is mainly for lifting and reversing the third partition wall 7.

  When installing the third partition wall 7 in the passenger compartment 2 at the end of the side surface (side surface in the axial direction) on the third section C side and the fourth section D side of the third partition wall 7, An installation position adjustment bracket 14 for adjustment is provided. Similar to the first partition wall 5, the installation position adjustment bracket 14 is provided with a screw groove 14 a through which an installation position adjustment bolt (not shown) can penetrate in the radial direction. Make contact with the passenger compartment.

  As shown in FIG. 5, the radial side surface of the fourth partition wall 8 has a substantially convex shape, and is shaped so as to be substantially fitted to the wall surface of the high-pressure casing 1. A groove 50 is provided circumferentially on the fifth section E side of the convex portion on the side surface in the radial direction of the fourth partition wall 8, and the end face O-ring 10 is fitted into the groove 50. Further, a groove portion 51 is provided in a circumferential shape on the fourth section D side and the fifth section E side on the side surface in the radial direction of the fourth partition wall 8, and the piston O-ring 11 is fitted and installed in the groove section 51.

  As shown in FIG. 1, a screw groove 8 a for attaching a member for lifting the fourth partition wall 8 when the fourth partition wall 8 is installed in the lower passenger compartment 2 is provided on the side surface in the radial direction of the fourth partition wall 8. This is mainly for adjusting the position in the vertical direction (radial direction). Further, a screw groove 8b for attaching a member for lifting the fourth partition wall 8 when the fourth partition wall is installed in the passenger compartment is also provided on the side surface of the fourth partition wall 8 on the fifth section E side. This is mainly for lifting and reversing the fourth partition wall 8.

  When the fourth partition 8 is installed in the lower passenger compartment 2 at the end of the side surface (side surface in the axial direction) on the fourth section D side and the fifth section E side of the fourth partition wall 8, the installation position of the fourth partition wall 8 is set. An installation position adjustment bracket 15 for adjustment is provided. Similarly to the first partition wall 5, the installation position adjustment bracket 15 is provided with a screw groove 15 a through which an installation position adjustment bolt (not shown) can penetrate in the radial direction, and the tip of the penetrated installation position adjustment bolt is located at the end. Make contact with the lower passenger compartment 2.

  As shown in FIG. 1, the radial side surface of the fifth partition wall 9 has a substantially convex shape and is shaped so as to be substantially fitted to the wall surface of the high-pressure casing 1. A groove (not shown) is provided circumferentially on the sixth section F side of the convex portion on the radial side surface of the fifth partition wall 9, and an end face O-ring (not shown) is fitted into the groove.

  Next, a water pressure test method for the high-pressure casing 1 of the steam turbine according to the present embodiment will be described. First, the passenger compartment 2 is installed, and a member for lifting the first partition wall 5 is attached to the screw grooves 5a and 5b in the passenger compartment 2, and the first partition wall 5 is lifted and installed at a predetermined position using this member.

  At this time, a liner 22 (see FIG. 2) is installed in the lower passenger compartment 2 so that the first partition 5 can be installed at a predetermined position. The liner 22 has a thickness that is half of the difference between the inner diameter of the lower casing 2 and the outer diameter of the first partition wall, and has a length that is one third of the inner circumference of the lower casing 2. Further, grease is sufficiently applied to the seal surfaces of the piston O-ring 11 and the end surface O-ring 10 and the lower passenger compartment 2.

  As a result, the sealing performance of the first partition wall 5 is improved, and the frictional force applied to the piston O-ring 11 and the end face O-ring 10 when the first partition wall 5 is installed by grease is reduced. It is possible to prevent the end face O-ring 10 from falling off. The second partition wall 6 to the fifth partition wall 9 are installed in the lower passenger compartment 2 in substantially the same manner.

  The first bulkhead 5 installed in the lower passenger compartment 2 is finely adjusted using the installation position adjusting bolts 12b attached to the installation position adjusting bracket 12 so that the piston O-ring 11 is in contact with the lower passenger compartment 2 evenly. The installation positions of the second partition wall 6 to the fourth partition wall 8 are finely adjusted in substantially the same manner.

  After fine adjustment of the installation positions from the first partition wall 5 to the fourth partition wall 8 is completed, the upper casing 3 is covered to form the high-pressure casing 1, and the large lid 4a and the small lid 4b are attached to the end of the high-pressure casing 1. After attaching the large lid 4a and the small lid 4b, water is injected in order of increasing water pressure from the first zone A to the sixth zone F, and water pressure is applied.

  As a result, the first partition wall 5 is placed on the high pressure vehicle interior wall 23 (see FIG. 2) on the first section A side, and the second partition wall 6 is placed on the high pressure vehicle interior wall 32 (see FIG. 3) on the second section B side. The third partition wall 7 is on the high pressure vehicle interior wall 42 (see FIG. 4) on the third section C side, the fourth partition wall 8 is on the high pressure vehicle interior wall 52 (see FIG. 5) on the fifth section E side, and the fifth partition wall 9 is on Since it is pressed against the high pressure vehicle interior wall (not shown) on the sixth section F side, the sealing performance of the first partition wall 5 to the fifth partition wall 9 is ensured.

  In this embodiment, both the piston O ring 11 and the end face O ring 10 are provided on the first partition wall 5, the second partition wall 6, the third partition wall 7 and the fourth partition wall 8. However, only the piston O ring 11 is provided and water pressure is increased. It is also possible to conduct a test.

According to the water pressure test structure and the water pressure test method for the high pressure casing 1 of the steam turbine according to the present embodiment, the piston O-ring 11 provided on the outer peripheral surface side of the first partition wall 5 to the fourth partition wall 8 includes Since an appropriate water pressure is applied to the partition wall by the fitting gap between the first partition wall 5 and the fourth partition wall 8, the sealing performance of the end face O-ring 10 and the piston O-ring 11 can be achieved without using the conventionally used tension bolt and hydraulic jack. Can be secured.

  Further, the installation position adjusting brackets 12, 13, 14, 15 and the installation position adjusting bolts 12b are provided on the respective partition walls to finely adjust the installation positions of the respective partition walls. The gap between the first partition wall 5 to the fourth partition wall 8 and the inner peripheral surface of the high-pressure casing 1 is kept substantially constant even if a slight shift occurs in the axial direction due to Can be secured.

Further, since the first partition wall 5 to the fifth partition wall 9 are pressed against the high-pressure casing 1 by the water pressure difference between the first section A and the sixth section F, the conventional partition wall 71 (see FIG. 7) is replaced with the high-pressure casing 70 (FIG. 7). The sealing performance of the end face O-ring 10 and the piston O-ring 11 can be ensured without performing the installation work of each partition wall using the tension bolt and the hydraulic jack, which has been performed for pressing to the reference).

  The present invention is effective in preventing water leakage between each partition wall and the high-pressure casing without using a hydraulic jack or the like in a water pressure test of a high-pressure casing such as a steam turbine.

It is sectional drawing in the up-down direction of the high pressure vehicle interior of a steam turbine. It is sectional drawing in the up-down direction of a 1st partition edge part. It is sectional drawing in the up-down direction of the 2nd partition wall edge part. It is sectional drawing in the up-down direction of a 3rd partition edge part. It is sectional drawing in the up-down direction of the 4th partition edge part. It is a top view by the side of the 1st section of the 1st partition. It is the water pressure test structure of the high-pressure casing of the conventional steam turbine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High pressure compartment 2 Lower compartment 3 Upper compartment 4a Large lid 4b Small lid 5 First partition 5a, 5b First partition lifting screw groove 6 Second partition 6a, 6b Second partition lifting screw groove 7 Third partition 7a , 7b Third partition lifting screw groove 8 Fourth partition wall 8a, 8b Fourth partition lifting screw groove 9 Fifth partition wall 10 End face O-ring 11 Piston O-ring 12, 13, 14, 15 Installation position adjusting brackets 12a, 13a , 14a, 15a Installation position adjusting bolt screw groove 12b Installation position adjusting bolt 20, 30, 40, 50 End face O-ring grooves 21, 31, 41, 51 Piston O-ring grooves 22 Liners 23, 32, 42, 52 High Pressure Car Interior Wall 70 High Pressure Car Room 71 Bulkhead 72 Upper Car Room 73 Lower Car Room 74 Both Screw Bolts 75 Manhole 76 Tensile Bolt A First Zone B Second Zone C Third Zone D Second 4 zone E 5th zone F 6th zone

Claims (3)

A high-pressure cabin to be tested,
A plurality of partition walls that match fit with the inner wall of the high pressure casing,
A plurality of spaces formed by the high-pressure casing and the plurality of partition walls;
A piston O-ring that is circumferentially provided on the radial side surface of the partition wall and fitted into the first groove portion so as to contact the inner wall of the high-pressure casing;
An end face O-ring that is provided with a second groove portion on the side surface in the radial direction of the partition wall that presses the inner wall of the high-pressure casing due to a water pressure difference of water injected into the space, and is fitted into the second groove portion. It has a door,
Hydrostatic testing structure of the high-pressure casing, wherein Rukoto water pressure to the partition walls written by clearance fitting of the high-pressure casing and the partition wall. In the hydraulic test structure for a high-pressure casing according to claim 1,
A water pressure test structure for a high-pressure casing, wherein a positioning mechanism for adjusting an installation position of the partition wall in the axial direction is provided on a side surface in a radial direction of the partition wall. In the water pressure test structure for a high-pressure casing according to claim 1 or 2,
A water pressure test method for a high-pressure casing, wherein water is injected into a space partitioned by the partition, and the partition is pressed against an inner wall of the high-pressure casing with the pressure of the water.

Images