KR200286856Y1 - Automatic open-close apparatus of blind flange for nuclear fuel forwarding tube for nuclear power plant - Google Patents

Abstract

The present invention provides a blind flange automatic opening and closing device for a fuel transport tube that can quickly and safely open and close a blind flange for sealing a containment side flange of a fuel transport tube installed between a containment building and a spent fuel building in a nuclear power plant. For the purpose of the present invention, a blind flange having a ring gear 22 which swings the blind flange 2 so as to transfer the fuel or the seal 23 in close contact with the blind flange falls, and in front of the flange 61 of the tube 6. A blind flange seat (1) is mounted to allow the ring gear (22) mounted blind flange (2) to enter vertically, and a guide column (5) is arranged side by side in front of the flange (61) of the tube (6). While the blind flange (2) is installed so that the blind flange locking means (3) suspended vertically and quietly A blind flange automatic opening and closing device for a nuclear fuel transfer tube of a nuclear power plant provided with a blind flange locking means (3) and a blind flange lifting means (4) for raising or lowering the blind flange (2) above the blind locking means (3). It features.

Description

Automatic open-close apparatus of blind flange for nuclear fuel forwarding tube for nuclear power plant}

The present invention provides a safe and quick operation for the opening and closing of the blind flange and seal replacement of the containment side flange of the fuel transport tube installed between the containment building and the spent fuel building of the nuclear power plant. A blind flange automatic switchgear for a nuclear fuel transfer tube.

In Fig. 1, a nuclear fuel transfer tube (c) is provided between a containment building (a) and a spent fuel building (b) of a nuclear power plant. In addition, a gate valve (d) is installed in the tube of the containment building (a) and a blind flange (e) is installed in the tube end of the spent fuel building (b). The blind flange (e) is a flange cover for radioactively and safely blocking the inside and outside of the containment building (a).

Then, the worker goes down to the spent fuel building (b) to release the bolt, open the blind flange (e) to transfer the fuel, and then go back down to block the tube (c) with the blind flange (e). The manhole f is also provided.

In FIG. 2, the swing arm i is conventionally attached by attaching a hinge h to the flange g of the tube c, and the top of the blind flange e is attached to the swing arm i, and the flange (g) and blind flange (e) are adapted to fit radially perforated fastening holes at the edges and fasten with bolts (j). The number of fastenings of the bolt j is as high as 20.

The nuclear fuel delivery blind flange of this type of conventional reactor is

It is a manual type, which is opened and closed by, and is inefficient because the fuel transfer operation is slow. In addition, since the blind flange is located at the lowest position among the tanks for reloading the fuel, it is difficult to completely drain the water even if the filled water is drained to prevent radioactive leakage before the fuel is transferred. Therefore, radioactive contamination is the highest. If such a long time is required to open and close the blind flange in such a place, the operator is likely to cover the radioactivity, and the space dose rate is relatively high. The same is true when replacing a seal installed on a blind flange. In large nuclear power plants, the use of larger radii tubes and blind flanges means more bolt fastening, which is a significant concern for overexposure to radiation.

The present invention is to automatically open and close the blind flange for the nuclear fuel transfer tube of the nuclear power plant which can quickly and safely open and close the blind flange for sealing the container side flange of the nuclear fuel transfer tube installed between the containment building and the spent fuel building in the nuclear power plant. It is for providing a device.

The task is to have a blind flange with ring gear that swings the blind flange so that the seals are transferred to the fuel or the seals close to the flange of the blind flange tube. A blind flange seat that can be saddle is attached, and guide pillars are installed on the left and right sides of the flange of the tube so that the blind flange locking means suspended from the blind flange can be installed vertically and quietly, and the blind lock means together with the blind locking means. A blind flange automatic switchgear for a nuclear fuel transfer tube of a nuclear power plant equipped with a blind flange raising means for raising or lowering a flange is achieved.

1 is a structural diagram of a fuel transfer tube installed between a containment building and a spent fuel building

2 is an installation example of a conventional blind flange

Figure 3 is a longitudinal sectional side view of the blind flange automatic opening and closing device according to the present invention is installed on the flange side of the nuclear fuel transfer tube

4 is a front view of the non-incision, seen from the right side of FIG.

Figure 5 is an enlarged cross-sectional view of the blind flange seated in a blind flange seat seated

6 is a perspective view of a blind flange sheet

7 is a front view of a state in which the blind flange is raised;

<Description of the symbols for the main parts of the drawings>

1: blind flange seat 2: blind flange

3: blind flange locking means 4: blind flange lifting means

5: guide pillar 6: tube

8: Suspension bolt 11: Flange seat

12: gear seat 13: jaw

14,24: gradient surface 21: axis

22: ring gear 31: bogie

32: air motor 34a, b: air cylinder

35: seat guide 41: motor

42: Drum 43: Rope

61: flange

3 and 4, the automatic blind flange opening and closing device proposed in the present invention is the blind flange seat (1) and the improved blind flange (2), blind flange locking means (3) and blind flange lifting means (4) and guide pillar It is a combination with (5).

5 and 6, the blind flange sheet 1 fastens the lower half to the flange 61 of the tube 6 so that the blind flange 2 can be vertically lowered and supported to be vertically lifted. The lower half circular blind flange seat 11 is formed in the inner end so that the lower half part of the blind flange 2 may closely contact, and the lower half circular gear seat 12 is formed outside the blind flange seat 11. . The gear seat 12 is a seat for the ring gear 22 coupled to the outer surface of the blind flange 2 to enter.

In addition, the jaw 13 formed at the outer side of the ring gear seat 12 to protect the ring gear seated in the ring gear seat 12 from falling outwardly has an annular shape unlike the blind flange seat 11 and the gear seat 12. It forms and supports the outer surface of the ring gear 22 which sat in it. The inner edge of the jaw 13 is formed with a gradient surface 14. This gradient surface 14 slides toward the flange 61 of the tube 6 when the gradient surface 24 provided at the outer edge of the ring gear 22 is lifted when the ring gear engagement blind flange 2 is seated. The blind flange 2 is brought into close contact with the flange 61. In addition, the inner surface of the blind flange sheet 1 drills a fastening hole 15 corresponding to the fastening hole 62 drilled in the lower half of the existing flange 61.

3 and 5, the blind flange 2 has a shaft 21 on the back surface. The shaft 21 is used for fitting the ring gear 22. Attached to the inner side of the blind flange 2 is the annular seal 23.

The ring gear 22 is engaged with the drive gear 33 of the blind flange locking means 3 and rotates the blind flange 2 alternately in the circumferential direction with the driving force of the air motor 32 so as to be engaged with the flange 51. And it is a power relay means used to release the close contact and close contact. The outer edge of the outer surface of the ring gear 22 is formed with a gradient surface 24 corresponding to the above-described gradient surface 14. This sloped surface 24 is guided automatically and carefully by sliding the sloped surface 14 and approaching the flange 51 when the blind flange 2 is seated in the blind flange seat 1. will be.

In FIGS. 3 and 4, the blind flange locking means 3 locks the blind flange 2 seated in the blind flange seat 1 to be in close contact with the flange 61 of the tube 6, and the blind flange 2 is closed. Before pulling up, the blind flange 2 in which the seal is in close contact with the flange 61 of the tube 6 is pushed down from the left and right side so as to easily be pulled up, and the trolley 31 and the air motor 32 are driven. Gear 33, air cylinders 34a and b, seat guide 35 and rope hook 36 and sleeves 37a and b.

The trolley 31 hangs and supports the blind flange 2 while mounting all the components of the blind flange locking means 3, and is raised and lowered vertically by the pulling means 4. In the bottom deck of the trolley | bogie 31, the suspension hole 38 which loosely supports the suspended flange 2 by hanging the hanging suspension bolt 8 is drilled.

The air motor 32 rotates the drive gear 33 forward and backward to drive the ring gear 22 so that the blind flange 2 closely attached to the flange 61 is brought into close contact with each other so as to be self-aligned or from the flange 61 to the blind flange ( 2) It is a driving means to drop. The drive gear 33 is installed on the motor shaft of the air motor 32. The power of the drive gear 33 is decelerated through the reduction gears 39a and b and then transmitted to the ring gear 22.

Air cylinders 34a and b are for homing the blind flange 2 on the trolley 31 by circumferentially moving the blind flange 2 to the center of the flange 61, and the apex of the blind flange 2 It is installed in the circumferential direction in the circumferential direction on the basis of the reference, and the front end of the ram (38 ') of each air cylinder (34a, b) is always in contact with the main surface of the blind flange (2).

Although the lower half of the blind flange sheet 1 is fastened by the bolt 7 to the flange 61 of the tube 6, since the upper half is not fixed anywhere, the stability is lower than the lower half. This is especially true when the blind flange 2 is seated. The seat guide 35 is necessary to dispel this concern. The seat guide 35 supports the outer surface of the upper half of the blind flange seat 1 in a state where the blind flange locking means 3 is lowered to stabilize the flange 61 sealed by the blind flange 2. Since the seat guide 35 only needs to support the upper half of the blind flange sheet 1, it takes the upper half of a circular ring. The seat guide 35 is fastened to the lower end of the bogie 1 with a bolt 9.

The rope hook 36 attached to the apex of the bogie 31 is suspended from the rope 43 lowered from the blind flange pulling means 4. And both sides of the trolley 31 and the seat guide 35 is attached to the sleeve (37a, b) that rides around the guide pillar (5) so as to raise and lower silently.

The blind flange lifting means 4 is fixed to the upper end of the guide column 5 to raise or lower the blind flange locking means 3 on which the blind flange 2 is suspended. The motor 41 and the rope drum 42 ) And a winch 43 wound around the rope drum 42.

The guide column 5 stands side by side immediately in front of both sides of the flange 61 of the tube 6 to guide the blind flange locking means 3 to move up and down smoothly in the right posture ascending and descending.

Suspension bolt (8) is to fasten the head 81 to the jaw of the suspension hole 38 of the bogie 31 to fasten to the government of the blind flange (2).

In FIG. 7, the blind flange locking means 3 is pulled up by moving the pulling means 4 to wind the rope 43, and the blind flange locking means 3 pulls the blind flange 2. The lifting of the blind flange 2 is carried out until the flange 61 is fully opened so that there is no obstacle in the transfer of nuclear fuel through the tube 6, and the flange 61 is replaced when the seal 23 is replaced. Raise the blind flange (2) completely up.

It is unreasonable to raise the blind flange 2 which sealed the flange 61 immediately. In the sealed state of the blind flange 2 with respect to the flange 61, the seal 23 adheres to the flange 61 mostly. Therefore, the blind flange 2 must be dropped from the flange 61 before pulling up. In this case, the air motor 32 is utilized. In other words, the air motor 32 is driven forward and backward. Then, the power is transmitted to the ring gear 22 through the drive gear 33 and the reduction gears 39a and b to shake the blind flange 2 from side to side so that the seal 23 adhering to the flange 61 falls. . Thus, after the seal 23 is completely dropped, the seal 23 must be pulled up by the pulling means 4 so that the seal 23 can be protected and the blind flange 2 can be easily pulled up.

After transferring the nuclear fuel, or after replacing and reloading the seal 23, the pulled up blind flange 2 is lowered to be seated in the blind flange sheet 1 as shown in FIG. 3 and the flange 61 is sealed. In the process of sealing the flange 61, the blind flange 2 is seated on the blind flange seat 11 of the blind flange seat 1, and the ring gear 22 sits on the gear seat 12. At this time, the gradient surface 24 of the ring gear 22 slides on the gradient surface 14 of the blind flange sheet 1 and approaches the flange 61. Accordingly, the blind flange 2 automatically closes to the flange 61 by itself and is locked as it is.

At this time, when the center of the blind flange 2 does not coincide with the center of the flange 61, the air cylinders 34a and b are sequentially applied with air pressure to cause the blind flange 2 to swing in the circumferential direction. Set the origin through

As described above, according to the present invention, a blind flange for opening and closing the containment container side flange of a nuclear fuel transport tube installed between the containment building and the spent fuel building in a nuclear power plant, by using the blind flange locking means and the pulling means on the ground Can open and close very quickly.

In addition, the blind flange can be opened in a short time on the ground to transfer nuclear fuel or replace the unloaded seal, so it is safe because the operator is very unlikely to be coated on the radioactivity during the nuclear fuel transfer or the thread replacement loading operation.

Claims (3)

The lower semicircular blind flange seat 11 has a lower semicircular gear seat 12 and an outer edge of the gear seat 12 has an annular jaw 13 whose inner edge is a gradient surface 14 and a tube 6. A blind flange sheet (1) adapted to fix the lower half to the flange (61) of the; A blind flange (2) in which a ring gear (22) having a gradient surface (24) corresponding to the gradient surface (14) is fitted to a shaft (21) formed concentrically on an outer surface thereof; Attached to the bogie 31, the air motor 32 for driving the ring gear 22 and the air cylinders 34a and b for the origin adjustment of the blind flange 2, the upper semicircular seat guide 35 attached to the outer surface, and the apex. Blind flange locking means (3) comprising a rope hook (36); Blind flange lifting means 4 composed of a motor 41, a drum 42, and a rope 43; A guide column 5 installed side by side in front of the flange 61 of the tube 6 to guide the lifting and lowering of the blind flange locking means 3 and the blind flange 2; Blind flange automatic for nuclear fuel transfer tube of the nuclear power plant, characterized in that it consists of a suspension bolt (8) fastened to the top of the blind flange (2) hanging over the suspension hole 38 drilled on the bottom of the bogie (31) Switchgear. 2. A blind flange automatic opening and closing device for a nuclear fuel transfer tube according to claim 1, wherein a sleeve (37a) for a guide column (5) is attached to the cart (31). The blind flange automatic opening and closing device according to claim 1, wherein a sleeve (37b) for a guide column (5) is attached to the seat guide (35).