JP3869062B2 - Pressure vessel opening closure device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure vessel opening closing device, and more particularly to a pressure vessel opening closing device that can be easily accommodated during a pressure test.
[0002]
[Prior art]
For water heaters applied to pressure vessels such as thermal power plants and nuclear power plants, it is legalized to conduct a water pressure test 1.5 times the design value in advance because of handling high-temperature and high-pressure steam. The structure is shown in FIG.
[0003]
The feed water heater 1 is configured to include a main body barrel 3 that is integrally formed with the water chamber 2 a via a tube plate 2. The water chamber 2a is provided with a water supply inlet nozzle 4, a water supply outlet nozzle 5, a manhole 6 for checking inside the vessel, and a water chamber partition plate 7 inside the vessel.
[0004]
The main body 3 includes a steam inlet nozzle 8 and a steam outlet nozzle 9, and accommodates a heat exchanging portion 12 including a U-shaped heat transfer tube 11 supported by a partition plate 10 in the container. Yes.
[0005]
On the other hand, when performing a pressure resistance test before using the feed water heater 1, the manhole 6 has an inner lid 14 that is in pressure contact with the inner side of the water chamber 2 a via an O-ring 13 as shown in FIG. A closing portion 18 constituted by an external lid 17 that is inserted through 15 and supported by a nut 16 is mounted.
[0006]
As another means, the manhole 6 is provided with a mounting seat 19 as shown in FIG. 8, and an inner lid 14 that is in pressure contact with the inner side of the mounting seat 19 via an O-ring 13 and a bolt from the outside. There is a case where a closing portion 18 constituted by an external lid 17 that is inserted through 15 and supported by a nut 16 is attached.
[0007]
On the other hand, as shown in FIG. 9, the water supply inlet nozzle 4 and the water supply outlet nozzle 5 of the water chamber 2a are provided with a lid 20 formed integrally with the water supply inlet nozzle 4 and the water supply outlet nozzle 5, As shown in FIG. 10, what welded the lid | cover 20 to the water supply inlet nozzle 4 and the water supply outlet nozzle 5 was used, and the lid | cover 20 was cut | disconnected after completion | finish of a pressure | voltage resistant test. The two-dot chain line is a groove to which a water supply pipe is attached after the lid 20 is cut.
[0008]
[Problems to be solved by the invention]
By the way, in the recent water heater 1, when the water chamber 2 a is manufactured, as shown in FIG. 11, the manhole 6, the water supply inlet nozzle 4, and the water supply outlet nozzle 5 are welded to the spherical end plate 21, As shown in FIG. 12, the end plate 21 is welded to the tube plate 2 of the main body barrel 3, and the manhole 6, the feed water inlet nozzle 4 and the feed water outlet nozzle 5 are integrally attached to the end plate 21 in advance. Aside from that, the end plate 21 is being welded to the tube plate 2 of the main body barrel 3, and the number of work steps is reduced, and the cost is reduced.
[0009]
However, in the production of the water chamber 2a, the end plate 21 provided with the manhole 6, the water supply inlet nozzle 4 and the water supply outlet nozzle 5 is integrally manufactured. As shown in FIG. It is necessary to machine the inner surfaces of the manhole 6, the feed water inlet nozzle 4 and the feed water outlet nozzle 5 without necessarily reducing the cost.
[0010]
Further, when the pressure resistance test of the feed water heater 1 is performed, the water chamber 2 provided with the manhole 6, the feed water inlet nozzle 4 and the feed water outlet nozzle 5 may be integrally manufactured, but the feed water inlet nozzle 4 and the feed water outlet nozzle 8, 9, and 10, the mounting seat 19 or the lid 20 is required, and it is not always necessary to consider the cutting work of the mounting seat 19 or the lid 20 after the pressure resistance test is finished. It has not been linked to the reduction.
[0011]
The present invention has been made based on such circumstances, and when performing a pressure test of a pressure vessel, by using a closure portion that can be accommodated in the opening portion, the conventional accommodation work has been greatly reduced. An object of the present invention is to provide a device for closing a pressure vessel opening.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the pressure vessel opening closing device according to the present invention is a pressure vessel opening for performing a pressure resistance test by attaching a closing portion to the opening of the vessel as described in claim 1. In this closing device, the closing portion closes the locking means for locking to the protruding piece provided at the bottom of the opening, the opening intermediate closing member for closing the middle of the opening, and the top of the upper opening. Each of the closure means for the top of the opening is provided with a disk part integrally formed on a shaft part screwed to the closure for the intermediate part of the opening, and provided on both sides of the disk part. A clevis that is rotatable through a pin inserted through the plate portion, a main guide that is provided on one side of the clevis and serves as a guide when the closing portion advances and retreats the opening, and a notch of the clevis And the closure advances the opening. And a protective piece that protects against a collision with the protruding piece, and the closing intermediate part for the opening includes a second disk part that is screw-coupled to the locking means, and a shoulder part of the second disk part An auxiliary guide provided at the bottom of the second disk portion, screw-connected to the shaft portion of the locking means, and serving as a guide when the closing portion advances and retreats the opening. The opening top closing body includes a first disk portion for pressing a seal member attached to a shoulder of the second disk portion of the opening intermediate portion closing body, and applies a pressing force to the first disk portion. A lock nut connected to the second disk portion of the closing body for the opening intermediate portion, a spacer attached to the first disk portion, and a support plate positioned transversely to the spacer, Second of the body closure The disk portion which is constituted by a supporting bolt for fixing through the support plate.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a pressure vessel opening closing device according to the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a schematic cross-sectional view showing an example in which the pressure vessel opening closing device according to the present invention is applied to an opening of a water chamber of a feed water heater.
[0015]
The closing part 23 according to the present embodiment includes an engaging means 26 that engages with the bottom of the opening 25 of the water chamber 24, an opening intermediate closing body 27 that closes the intermediate part of the opening 25, and the opening. Each of the opening top closing bodies 28 for closing the tops of 25 is provided.
[0016]
The opening top closing body 28 has a concave spacer 30 attached to the first disk portion 29, a hydraulic mechanism portion 31 mounted on the spacer 30, and a pressing force applied from the hydraulic mechanism portion 31. Closed body support portions 32 that support the closed body 27 and prevent movement into the water chamber 24 are provided.
[0017]
Further, the hydraulic mechanism 31 is connected to the opening intermediate portion closing body 27 via a pooling shaft 33 by a screw portion 34.
[0018]
Further, the closing body support portion 32 includes support bolts 36 supported at the top of the opening portion 25 of the water chamber 24 on both sides of a support plate 35 installed across the spacer 30 formed in a concave shape, and has an opening. A stopper 37 for fixing the intermediate closing body 27 is provided.
[0019]
On the other hand, the opening intermediate portion closing body 27 includes a first disk portion 29 and a second disk portion 40 fixedly supported by the screw portion 39 of the lock nut 38, and a seal member 41 attached to the shoulder portion 40a. ing. Note that the seal member 41 may be sandwiched between pressing pieces 42 as shown in FIG. When the diameter of the opening 25 is increased, the sealing effect is increased, which is convenient.
[0020]
The opening intermediate portion closing body 27 includes a concave auxiliary guide 43 at the bottom thereof, and is connected to the opening bottom portion closing body 26 by a screw portion 44. The reason why the auxiliary guide 43 is formed in a concave shape is to increase the sliding area.
[0021]
On the other hand, the locking means 26 for locking to the bottom of the opening 25 includes a disk part 46 formed integrally with the shaft part 45, and clevis 47 on both sides of the disk part 46, as shown in FIG. The clevis 47 is connected to the disc portion 46 by a pin 48 so that the clevis 47 can be rotated.
[0022]
The pin 48 includes a main guide 50 via a stopper 49 on one side, and a stopper 51 that prevents the clevis 47 from moving in the transverse direction on the other side.
[0023]
Further, as shown in FIG. 1, the locking means 26 includes a protective piece 54 on the protruding piece 52 of the water chamber 24 via a stopper 53, and the protective piece 54 is supported by the stopper 53, thereby When the means 26 is inserted into the opening 25, damage due to the collision of the protruding piece 52 is prevented. In the present embodiment, the locking means 26 has the shaft portion 45 connected to the second disk portion 40 of the opening intermediate portion closing body 27 by the screw portion 44. However, even if the amount of water supply increases, If the length l of the 24 opening portions 25 is constant, the shaft portion 45 and the second disk portion 40 may be integrally formed.
[0024]
Further, in this embodiment, the locking means 26 is constituted by a disk portion 46, a clevis 47, and a main guide 50 that are integrally formed with the shaft portion 45. In order to simplify this structure, FIG. As shown, a trapezoidal yoke portion 55 may be inserted into the shaft portion 45 and supported by a nut 56 so that the yoke portion 55 can be attached and detached. In this case, a worker entering from a manhole (not shown) of the water chamber 24 protrudes and supports the protective piece 54 on the piece 52 with a stopper 53, and then attaches the yoke portion 55 to the protective piece 54 to externally After the shaft portion 45 is inserted, the nut 56 may be fixedly supported.
[0025]
The closing portion 23 according to the present embodiment applies the pressing force from the hydraulic mechanism portion 31 to the opening intermediate portion closing body 27 via the pooling shaft 33 and sets it at a predetermined position, while pressing the lock nut 38 by tightening it. Pressure is applied to the first disk portion 29 to compress the seal member 41. At this time, the opening intermediate portion closing body 27 tries to move, but the closing body support portion 32 prevents the movement.
[0026]
Thus, according to the closing part 23 according to the present embodiment, water leakage can be reliably prevented by the seal member 41 during the pressure resistance test, and the opening intermediate part closing body 27 can be obtained by the pressing force of the hydraulic mechanism part 31. Can be automatically set at a predetermined position, and even if the pressing force of the hydraulic mechanism portion 31 becomes excessive, the closing body support portion 32 can reliably maintain the opening intermediate portion closing body 27 at the predetermined position.
[0027]
Therefore, in the closing portion 23 according to the present embodiment, the opening intermediate portion closing body 27 can be automatically and reliably set at a predetermined position, so that the setup, treatment, and work before and after the pressure resistance test are greatly improved as compared with the conventional case. be able to.
[0028]
Next, the insertion method to the water chamber of the feed water heater of the closing part 23 which concerns on this embodiment is demonstrated.
[0029]
When the water heater performs a pressure resistance test, as shown in FIG. 5, a water pressure of 525 kgf / cm ² g acts on the water chamber 24 formed by the end plate 58, and the water inlet nozzle 59, manhole 60, water supply The load acting on each outlet nozzle 61 is 450 tons. Moreover, the weight of the closing part 23 which resists a water pressure of 525 kgf / cm ² g is 300 kg.
[0030]
In this way, when the closing portion 23 composed of the opening top closing body 28, the opening intermediate portion closing body 27, and the locking means 26 , which are heavy objects, is inserted into the water supply outlet nozzle base 61, the hanging tool 62 is The closing portion 23 is carried in along the tube axis of the water supply inlet nozzle 61. At that time, the closing portion 23 is slid to the opening 25 using the main guide 50 and the auxiliary guide 43. Further, as shown in FIG. 1, the clevis 47 of the locking means 26 is rotated with respect to the center O of the pin 48 as shown by a two-dot chain line in the figure to avoid damage due to contact with the protruding piece 52. After being housed in a predetermined position, as shown by the solid line in the figure, it is returned to its original position, and abuts against the protective piece 54 at its notch 63.
[0031]
Next, when the closing part 23 is inserted into the water supply inlet nozzle 59, the hydraulic jack 64 presses the closing part 23 on the inclined base 65 in the pipe axis direction and accommodates it in the water supply inlet nozzle 59. At that time, the main guide 50 and the auxiliary guide 43 are urged to slide in the same manner as described above. Further, when the closing portion 23 is inserted into the water supply inlet nozzle 59, the clevis 47 is rotated in the same manner as described above to prevent contact with the protruding piece 52.
[0032]
Finally, the water chamber 24 is configured to attach the lid 66 to the manhole 60 when the accommodating operation into the opening 25 of the water supply outlet nozzle 61 of the closing body 23 and the opening 25 of the water supply inlet nozzle 59 is completed. Then, a gauge 67 is attached to the closing part 23 on the water supply outlet nozzle 61 side, and a pipe line 69 having a valve 68 is connected to the closing part 23 on the water supply inlet nozzle 59 side, and a pressure resistance test is started.
[0033]
In addition, although the closing part 23 which concerns on this embodiment is the illustration applied to the pressure test of a feed water heater, it can be easily applied also to the pressure test of pressure vessels, such as a nuclear power plant and a chemical plant.
[0034]
【The invention's effect】
As described above, the pressure vessel opening closing device according to the present invention is configured by combining the closing portion with the opening bottom closing member, the opening intermediate closing member, and the opening top closing member. Since it can be used repeatedly during testing, a special sealing part is provided in the opening as in the past, and after the pressure test, the sealing part is not subjected to machining work such as cutting. The work improvement can be greatly improved.
[0035]
In addition, the closing portion according to the present invention combines the locking means for locking to the bottom portion of the opening portion, the opening intermediate portion closing member, and the opening top portion closing member and screw-connecting them to facilitate the replacement work. Therefore, even if each closed body is worn out, it can be easily replaced, the setup work before the pressure vessel pressure test can be performed quickly, and the pressure vessel pressure test can be completed earlier than before. Can do.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a pressure vessel opening closing device according to the present invention.
FIG. 2 is a partial schematic cross-sectional view showing an opening bottom closure according to the present invention.
FIG. 3 is a schematic cross-sectional view showing a second embodiment of the seal member in the opening intermediate portion closing body according to the invention.
FIG. 4 is a schematic cross-sectional view showing a second embodiment of the opening bottom closure according to the present invention.
FIG. 5 is a view for explaining the setup when the closing portion according to the present invention is accommodated in each of the water supply inlet / outlet nozzles;
FIG. 6 is a view for explaining the setup of a pressure resistance test after accommodating the closing portion according to the present invention in each of the water supply inlet / outlet nozzles;
FIG. 7 is a schematic sectional view showing an example in which the closing portion according to the present invention is applied to a manhole in a water chamber.
FIG. 8 is a schematic cross-sectional view showing another embodiment in which a conventional closing portion is applied to a manhole in a water chamber.
FIG. 9 is a schematic sectional view showing an example in which a conventional lid is applied to a water supply inlet / outlet nozzle of a water chamber.
FIG. 10 is a schematic cross-sectional view showing another embodiment in which a conventional lid is applied to a water supply inlet / outlet nozzle of a water chamber.
FIG. 11 is a schematic cross-sectional view showing an embodiment of a conventional water chamber.
FIG. 12 is a schematic cross-sectional view showing another embodiment of a conventional water chamber.
FIG. 13 is a diagram for explaining a setup when machining a conventional water chamber.
FIG. 14 is a schematic cross-sectional view showing an embodiment of a conventional feed water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water heater 2 Tube plate 2a Water chamber 3 Main body trunk 4 Water supply inlet nozzle 5 Water supply outlet nozzle 6 Manhole 13 O-ring 14 Internal lid 15 Bolt 16 Nut 17 External lid 18 Closing part 19 Mounting seat 20 Lid 21 End plate 23 Closed Part 24 water chamber 25 opening part 26 locking means 27 opening intermediate part closing body 28 opening top part closing body 29 first disk part 30 spacer 31 hydraulic mechanism part 32 closing body support part 33 pooling shaft 34 screw part 35 support plate 36 Support bolt 37 Stopper 38 Lock nut 39 Screw part 40 Second disk part 40a Shoulder part 41 Seal member 42 Presser piece 43 Auxiliary guide 44 Screw part 45 Shaft part 46 Disc part 47 Clevis 48 Pin 49 Stopper 50 Main guide 51 Stop Tool 52 Projecting piece 53 Stopping tool 54 Protective piece 55 Yoke part 56 Nut 57 Water supply heater 58 End plate 59 Water supply Mouth tube base 60 Manhole 61 feed water outlet pipe base 62 hanging member 63 notch 64 of hydraulic jacks 65 ramp 66 the lid 67 gauge 68 a valve 69 conduit

Claims (1)

In a pressure vessel opening closing device for performing a pressure resistance test by attaching a closing portion to an opening of a container, the closing portion includes a locking means for locking to a protruding piece provided at the bottom of the opening, and the opening An opening middle portion closing body for closing the middle portion of the upper opening portion and an opening top portion closing body for closing the top portion of the upper opening portion, respectively, while the locking means is integrated with the shaft portion screwed to the opening middle portion closing body. A disc part to be formed, a clevis which is provided on both sides of the disc part, and is rotatable via a pin inserted through the disc part, and provided on one side of the clevis, and the closing part is A main guide that serves as a guide when the opening is advanced and retracted, and a protective piece that is attached to the notch of the clevis and protects against a collision with the protruding piece when the closing portion advances and retracts the opening. The opening intermediate part closing body is configured as described above. A second disk part screwed to the means, a seal member attached to the shoulder of the second disk part, provided at the bottom of the second disk part, screwed to the shaft part of the locking means, And an auxiliary guide that serves as a guide when the closing part advances and retreats the opening. The opening top closing body is a seal that is mounted on the shoulder of the second disk part of the opening intermediate closing body. A first disk portion for pressing the member; a lock nut that applies a pressing force to the first disk portion and is connected to the second disk portion of the closing member for the opening intermediate portion; and a spacer that is attached to the first disk portion A pressure vessel comprising: a support plate that is disposed transversely to the spacer; and a support bolt that fixes the second disk portion of the opening intermediate portion closing body via the support plate. Closing the opening Apparatus.

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