CN212510045U

CN212510045U - Be used for nuclear power station steam generator hydroecium drain pipe plugging device

Info

Publication number: CN212510045U
Application number: CN202021373662.0U
Authority: CN
Inventors: 肖可; 陈洪培; 毕昆; 陆龙臣; 祝沛桢
Original assignee: China Nuclear Power Operation Technology Corp Ltd
Current assignee: China Nuclear Power Operation Technology Corp Ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-02-09
Anticipated expiration: 2030-07-14

Abstract

The invention relates to the field of machinery, in particular to a device for plugging a drain pipe of a water chamber of a steam generator of a nuclear power station. The difficulty of vacuumizing, exhausting and filtering in the spent fuel transfer process is as follows: the operating space of the position of the drain pipe is small, and the plugging device is required to be short in length and small in size; the radioactive dose of the water chamber of the steam generator is large, and the plugging device is required to be quickly assembled and disassembled. In the device, a core rod is fixedly connected with a guide head, sequentially passes through a rubber ring, a gasket, a sleeve and a threaded sleeve, and a small hexagon nut and a large hexagon nut are arranged on the core rod to axially limit the threaded sleeve; the screw sleeve is connected with the sleeve through threads. The invention provides a convenient and effective plugging device aiming at the characteristic of plugging a drain pipe of a water chamber of a steam generator of a nuclear power station.

Description

Be used for nuclear power station steam generator hydroecium drain pipe plugging device

Technical Field

The invention relates to the field of machinery, in particular to a device for plugging a drain pipe of a water chamber of a steam generator of a nuclear power station.

Background

When the nuclear power station is overhauled, the main pipeline of the steam generator needs to be isolated from the primary side water chamber of the steam generator before reaching a high water level. The steam generator main pipe has two connecting channel with steam generator primary side hydroecium: the main pipeline port of the steam generator and the drain pipe of the water chamber of the steam generator. Steam generator hydroecium space is narrow and small, and the radioactive dose is high, and the hydroecium bottom cambered surface is pressed close to the drain pipe, and operating space is little, has proposed higher requirement to plugging device's length, volume and simple operation nature.

The invention mainly aims at the problems and the characteristic of plugging a drain pipe of a water chamber of a steam generator of a nuclear power station, and provides a convenient and effective plugging device.

Disclosure of Invention

1. The purpose is as follows:

the invention provides a device for plugging a drain pipe of a water chamber of a steam generator of a nuclear power station.

The difficulty of vacuumizing, exhausting and filtering in the spent fuel transfer process is as follows: the operating space of the position of the drain pipe is small, and the plugging device is required to be short in length and small in size; the radioactive dose of the water chamber of the steam generator is large, and the plugging device is required to be quickly assembled and disassembled.

A water drain pipe plugging device for a water chamber of a steam generator of a nuclear power station is characterized in that a core rod is fixedly connected with a guide head, sequentially penetrates through a rubber ring, a gasket, a sleeve and a screw sleeve, and a small hexagon nut and a large hexagon nut are arranged on the core rod to axially limit the screw sleeve; the screw sleeve is connected with the sleeve through threads.

The tail end of the core rod is provided with a pin hole, a cotter pin is arranged in the pin hole, and the small hexagon nut penetrates through the cotter pin.

The sleeve and the threaded sleeve are both cylindrical, the sleeve is screwed into the threaded sleeve, and threads on the threaded sleeve and the sleeve are left-handed threads.

The whole sleeve is cylindrical, and the middle part of the sleeve is provided with a limiting boss.

The rubber ring is made of nitrile rubber or ethylene propylene diene monomer, and the rubber ring and the gasket are arranged at intervals.

The outer side surface of the rubber ring is a prismatic surface.

The core rod and the thread sleeve can not move axially relatively but can rotate relatively.

The sleeve is hollow, and the core rod penetrates through the middle of the sleeve.

2. The technical scheme is as follows:

the invention is used for plugging the drain pipe of the water chamber of the evaporator, and the radial expansion is generated under the condition that the rubber ring is compressed in the axial direction, so that the drain pipe wall is expanded to form sealing.

3. The effect is as follows:

(1) the invention can realize the rapid plugging of the drain pipe of the water chamber of the steam generator of the nuclear power station, has short length and small volume and is beneficial to the operation in narrow space.

(2) The invention has quick assembly and disassembly, and can greatly reduce the operation time, thereby reducing the irradiated dose of operators; the rubber ring and the gasket are arranged at intervals, so that the rubber ring is stressed uniformly and is not easy to damage; and avoid direct contact between the rubber ring to produce too big friction and mutual adhesion effect influence resilience, from avoiding demolising the risk of difficulty.

Drawings

FIG. 1 Structure of the clogging of the hydrophobic pores

Figure 2 rubber ring structure

In the figure: 1. the device comprises a small hexagon nut, 2 large hexagon nuts, 3 thread sleeves, 4 sleeves, 5 core rods, 6 rubber rings, 7 gaskets and 8 guide heads.

Detailed Description

As shown in the attached figure 1, the hydrophobic pipe plug plugging device consists of a small hexagon nut 1, a large hexagon nut 2, a threaded sleeve 3, a sleeve 4, a core rod 5, a rubber ring 6, a gasket 7 and a guide head 8.

The core rod 5 is fixedly connected with the guide head into a whole through threaded connection or welding. The core rod sequentially penetrates through the rubber ring, the gasket, the sleeve and the thread sleeve.

The screw sleeve 3 is connected with the sleeve 4 through screw threads. The small hexagon nut 1 and the large hexagon nut 2 are arranged on the core rod 5, and the screw sleeve 3 is axially limited, so that the core rod 5 and the screw sleeve 3 can not axially move relatively but can rotate relatively. The tail end of the core rod 5 is provided with a pin hole, and after the drain pipe plugging device is processed and assembled, a cotter pin is arranged in the pin hole to prevent the small hexagon nut 1 from loosening.

The threads on the screw sleeve 3 and the sleeve 4 are left-handed threads, so that the installation and removal processes of the drain pipe plugging device are more in line with the daily operation habits of people, namely when the screw sleeve 3 is screwed clockwise, the guide head 8 and the sleeve 4 compress the rubber ring 6 to expand the drain pipe wall; when the screw sleeve 3 is screwed anticlockwise, the guide head 8 and the sleeve 4 are loosened, and the rubber ring 6 rebounds.

The sleeve 4 is provided with a boss to limit the insertion depth of the drain pipe plugging device, and meanwhile, the boss is propped against the drain pipe opening to limit the rotation of the sleeve 4 during installation and removal.

As shown in figure 2, the rubber ring 6 is made of nitrile rubber or ethylene propylene diene monomer, the structure of the rubber ring is shown in the figure, the rubber ring 6 and the gasket 7 are arranged at intervals, so that the rubber ring is stressed uniformly in the axial direction, and the phenomenon that the rubber ring 6 is directly contacted with each other to generate mutual adhesion and effect and influence resilience is avoided.

During the installation, insert the drain pipe with drain pipe plugging device, support the drain pipe drill way until the boss on sleeve 4, twist clockwise and move swivel nut 3, swivel nut 3 moves right for sleeve 4, withstands little hexagon nut 1, drives core bar 5 and moves right to make sleeve 4 and direction head 8 be close to along the axial, produce the axial extrusion to the rubber ring, thereby produce radial expansion, expand tight drain pipe inner wall and form sealedly. When the device is disassembled, the screw sleeve 3 is screwed clockwise, the screw sleeve 3 moves leftwards relative to the sleeve 4 and props against the large hexagon nut 2 to drive the core rod 5 to move leftwards, so that the sleeve 4 and the guide head 8 are far away from each other along the axial direction, the rubber ring 5 is released from being extruded in the axial direction, the rubber ring rebounds, and the drain pipe plugging device can be smoothly drawn out.

Claims

1. The utility model provides a be used for nuclear power station steam generator hydroecium drain pipe plugging device which characterized in that: the core rod (5) is fixedly connected with a guide head (8) and sequentially penetrates through the rubber ring (6), the gasket (7), the sleeve (4) and the threaded sleeve (3), and the small hexagon nut (1) and the large hexagon nut (2) are installed on the core rod (5) to axially limit the threaded sleeve (3); the threaded sleeve (3) is connected with the sleeve (4) through threads.

2. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the tail end of the core rod (5) is provided with a pin hole, a cotter pin is arranged in the pin hole, and the small hexagon nut (1) penetrates through the cotter pin.

3. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the sleeve (4) and the threaded sleeve (3) are both cylindrical, the sleeve (4) is screwed into the threaded sleeve (3), and threads on the threaded sleeve (3) and the sleeve (4) are left-handed threads.

4. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the sleeve (4) is cylindrical as a whole, and the middle part of the sleeve is provided with a limiting boss.

5. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the rubber ring (6) is made of nitrile rubber or ethylene propylene diene monomer, and the rubber ring (6) and the gasket (7) are arranged at intervals.

6. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the outer side surface of the rubber ring (6) is a prismatic surface.

7. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the core rod (5) and the thread sleeve (3) can not move axially relatively but can rotate relatively.

8. The device for plugging the drain pipe of the water chamber of the steam generator of the nuclear power plant as claimed in claim 1, wherein: the sleeve (4) is hollow, and the core rod (5) penetrates through the middle of the sleeve.