CN111331552A - Special tool and method for disassembling and assembling mechanical seal movable ring assembly - Google Patents

Abstract

The invention belongs to the field of maintenance of a containment gate of a nuclear power plant, and in particular relates to a special tool and method for disassembling and assembling a mechanical seal moving ring assembly. hole, base flange threaded hole, ring flange through hole and ring flange center hole. By measuring the distance between the annular flange and the base flange and adjusting the pre-tightening force of the four hexagonal flange nuts, the invention ensures that the moving ring is evenly stressed, can effectively prevent the moving ring and the positioning ring from jamming during disassembly and assembly, and is easy to operate. , which greatly improves work efficiency, greatly reduces equipment safety risks, and provides guarantee for the smooth development of personnel gate maintenance work.

Description

A special tool and method for disassembly and assembly of a mechanical seal moving ring assembly

technical field

The invention belongs to the field of maintenance of a containment gate of a nuclear power plant, in particular to a special tool and method for disassembling and assembling a mechanical seal moving ring assembly.

Background technique

The personnel gate is one of the important barriers to ensure the tightness of the containment, and it is also an important passage for personnel to enter and exit the reactor building. The mechanical part of the personnel gate is mainly composed of embedded parts, cylinder body, door panel and transmission mechanism. The opening and closing and interlocking functions of the inner and outer doors are mainly realized by a set of gear distribution mechanism. Four mechanical penetrations are respectively arranged on the gate cylinder: the inner door handwheel penetration, the outer door handwheel penetration, the inner door sealing and locking shaft penetration and the inner door door panel drive shaft penetration, its main function is to connect the cylinder The rotating power of the handwheel outside the body is transmitted into the distribution mechanism in the cylinder, or the output rotation power of the distribution mechanism in the cylinder is transmitted to the door opening and closing mechanism and the sealing mechanism outside the cylinder, while ensuring the tightness of the penetration position.

According to the requirements of the personnel gate operation manual, the two O-rings in the moving ring assembly of the mechanical penetration part of the personnel gate should be replaced at least every four years. The moving ring assembly needs to be disassembled before replacing the sealing ring. Due to the large elastic force of the spring behind the moving ring, the circlip is not easy to disassemble. When the moving ring is disassembled, it cannot be done at the maintenance site. It is necessary to fix the moving ring assembly on a vise, then use a puller to hold the moving ring to compress the spring, and finally use the circlip pliers to remove the circlip. When using the puller to compress the spring, the moving ring is prone to jamming and unable to rebound due to uneven force. The hard graphite ring inlaid on the moving ring is a key component to ensure the sealing of the mechanical penetration. Once damaged, the penetration will lose its use value, and the hard graphite ring is very fragile, and it is easy to remove and install the circlip without protection. Crush it.

Therefore, it is necessary to develop a special tool for the disassembly and assembly of the mechanical seal moving ring assembly, so as to facilitate the disassembly and assembly of the moving ring assembly of the mechanical penetration part of the personnel gate, protect the hard graphite seal ring on the moving ring from being damaged, and solve the deficiencies of the prior art. .

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a special tool and method for disassembling and assembling a mechanical seal moving ring assembly in view of the above-mentioned shortcomings of the prior art. Safe and convenient disassembly and assembly of the sealing ring assembly to ensure the smooth maintenance of the personnel gate during the unit overhaul.

The technical scheme of the present invention is:

A special tool for disassembly and assembly of a mechanical seal moving ring assembly, the special tool includes a base flange, a tie rod, a hexagonal flange nut, an annular flange, a base flange positioning hole, a base flange threaded hole, an annular flange through hole and The annular flange center hole, the base flange positioning hole and the base flange threaded hole are designed on the base flange, the annular flange through hole and the annular flange center hole are designed on the annular flange, one end of the tie rod is connected to the base flange, the tie rod The other end is connected with the annular flange.

The tie rod is fixedly connected to the annular flange through a hexagonal flange nut through the through hole of the annular flange.

Four base flange threaded holes are evenly distributed around the base flange.

The base flange positioning hole is located at the center of the base flange.

The two ends of the tie rod are distributed with threads, one end is connected with the threaded hole of the base flange, and the other end is connected with the hexagonal flange nut.

Four annular flange through holes are evenly distributed around the annular flange.

The center hole of the annular flange is located in the center of the annular flange.

A method for disassembling and assembling a mechanical seal moving ring assembly, the method specifically includes the following steps:

Step (1) Apply a layer of grease on the thread, lay the base flange flat on the workbench, screw the four tie rods to the base flange, turn it half a turn after screwing it to the bottom, and place the moving ring assembly that needs to be disassembled. On the base flange, the drive shaft is placed in the base flange positioning hole, the hard graphite sealing ring is facing up, install the ring flange so that the center of the ring flange is aligned with the center of the moving ring, and install the four hex flange nuts to the tie rod On, tighten the four hexagonal flange nuts crosswise, so that the annular flange evenly presses the moving ring, exposing the circlip groove of the moving ring assembly, measure the distance between the annular flange and the base flange, and adjust the four hexagonal method according to the measurement results. The pre-tightening force of the flange nut finally ensures that the flange distance deviation at the four tie rods is kept within 0.5mm. Use the circlip pliers to take out the circlip, evenly loosen the four hexagonal flange nuts, remove the ring flange, and remove the The positioning ring and the moving ring on the ring assembly, replace the O-ring in the moving ring;

Step (2) Reinstall the moving ring and the positioning ring in sequence, place the moving ring assembly on the base flange, place the drive shaft in the positioning hole of the base flange, and install the ring flange to make the ring Align the center of the flange with the center of the moving ring, install the four hexagonal flange nuts on the tie rod, and tighten the four hexagonal flange nuts crosswise, so that the ring flange evenly presses the moving ring and exposes the ring groove of the moving ring assembly. During the tightening process, measure the distance between the ring flange and the base flange at the four tie rod positions, adjust the pre-tightening force of the four hexagonal flange nuts according to the measurement results, and finally ensure that the flange distance deviation at the four tie rods is kept within 0.5mm , Use the circlip pliers to install the circlip. After the installation is complete, loosen the four hexagonal flange nuts evenly, remove the ring flange, take the moving ring assembly out of the base flange and put it back on the equipment.

The present invention has the following beneficial effects:

The use of the special tool provided by the invention has no special requirements on the working site conditions, and the operation is convenient. During the maintenance of the personnel gate of the nuclear power plant, the special tool is used to disassemble and assemble the moving ring assembly of the mechanical penetration piece, eliminating the need for moving the moving ring assembly. To the machine shop and use the vise to fix and pull the horse to assist the disassembly link, which greatly improves the work efficiency.

When using this special tool to compress the spring, the distance between the ring flange and the base flange can be measured and the pre-tightening force of the four hexagonal flange nuts can be adjusted to ensure that the moving ring is evenly stressed, which can effectively prevent the moving ring and positioning during disassembly and assembly. The ring is jammed.

According to the size of the key shaft of the moving ring assembly, a positioning hole is designed on the flange of the base to ensure that the moving ring is kept in the center position when the pre-tightening force is applied to the spring through the pull rod, which effectively prevents the moving ring assembly from moving during disassembly and assembly. .

According to the actual structure of the moving ring assembly, the annular flange is cleverly used, and the spring is effectively compressed under the joint action of the four pull rods, so that the circlip is no longer subject to spring pressure, and the relative position is more conducive to removing and installing the circlip. The problem of difficulty in disassembling and assembling the circlip during the disassembly of the moving ring assembly is solved.

Drawing on the sealing structure of the static ring of the mechanical penetration piece pressing the hard graphite ring of the moving ring, the annular flange is designed to press the hard graphite ring, which effectively protects the safety of the hard graphite sealing ring. The damage of the hard graphite sealing ring in the process greatly reduces the equipment safety risk in this work, and provides a guarantee for the smooth development of the personnel gate maintenance work.

Description of drawings

1 is a schematic structural diagram of a special tool for disassembly and assembly of a mechanical seal moving ring assembly designed by the present invention;

2 is a schematic diagram of the structure of the base flange in a special tool for disassembly and assembly of a mechanical seal moving ring assembly designed by the present invention;

3 is a schematic diagram of the structure of the annular flange in a special tool for disassembly and assembly of a mechanical seal moving ring assembly designed by the present invention;

Fig. 4 is a kind of mechanical seal moving ring assembly designed by the present invention to disassemble and assemble the special tool to use the assembly drawing;

Among them: 1-base flange, 2-tie rod, 3-hexagonal flange nut, 4-ring flange, 5-base flange positioning hole, 6-base flange threaded hole, 7-ring flange through hole, 8-ring flange -Central hole of annular flange, 9-drive shaft, 10-moving ring, 12-spring, 13-pin, 14-seal ring, 15-locating ring, 16-hard graphite ring, 17-circlip

Detailed ways

The technology of the present invention is further described below:

As shown in Figure 1, Figure 2 and Figure 3, the present invention provides a special tool for disassembly and assembly of a mechanical seal moving ring assembly, the special tool includes a base flange 1, a tie rod 2, a hexagonal flange nut 3, an annular flange 4. Base flange positioning hole 5, base flange threaded hole 6, annular flange through hole 7 and annular flange center hole 8, base flange 1 is designed with base flange positioning hole 5 and base flange threaded hole 6 , the annular flange 4 is designed with an annular flange through hole 7 and an annular flange center hole 8, the base flange 1 and the tie rod 2 are connected by threads, and the tie rod 2 passes through the annular flange through hole 7 and the hexagonal flange nut 3 fixed connections.

Four base flange threaded holes 6 are evenly distributed around the base flange 1, which are used to connect and fix the pull rod 2, and transmit the pulling force of the pull rod 2 to the base flange 1 through the thread.

The base flange positioning hole 5 is located in the center of the base flange 1 and plays a positioning role.

The two ends of the tie rod 2 are distributed with threads, one end is connected with the threaded hole 6 of the base flange, and the other end is connected with the hexagonal flange nut 3 through the annular flange through hole 7 .

Four annular flange through holes 7 are evenly distributed around the annular flange 4 .

The annular flange central hole 8 is located in the center of the annular flange 4 .

As shown in Figure 4, when using this tool to disassemble and assemble the mechanical seal moving ring assembly, when the four hexagonal flange nuts 3 are evenly tightened, the annular flange 4 generates pressure to push the moving ring 10 and compress the spring 11, so that the circlip 16 It is in a free state to facilitate disassembly and assembly, and at the same time, the annular flange 4 covers the two hard graphite sealing rings 15 to protect the hard graphite sealing rings from damage. The main function of the base flange 1 is to bear the pulling force from the tie rod 2 and the reaction force of the drive shaft 9, and the base flange positioning hole 5 can locate and keep the drive shaft 9 of the moving ring assembly in the center. There are four hexagonal flange nuts 3 in total, which are evenly and symmetrically tightened so that the annular flange 4 exerts pressure on the moving ring 10 to compress the spring. The function of the annular flange 4 is to push the movable ring 10 to compress the spring 11 under the action of the tie rod 2 and the hexagonal flange nut 3, while protecting the hard graphite sealing ring 15 from damage.

The present invention also provides a method for disassembling and assembling a mechanical seal moving ring assembly, the method specifically includes the following steps:

Step (1) Check whether the threads of each part of the tool are in good condition, and apply a layer of grease on the threads to prevent the threads from being seized. To the base flange 1, screw it to the bottom and then turn it for half a turn, place the moving ring assembly to be disassembled on the base flange 1, place the drive shaft 9 in the positioning hole 5 of the base flange, and install the hard graphite sealing ring upward. Ring flange 4, align the center of the ring flange 4 with the center of the moving ring 10, install the four hexagonal flange nuts 3 on the tie rod 2, and tighten the four hexagonal flange nuts 3 crosswise to make the ring flange evenly pressed The moving ring exposes the circlip groove of the moving ring assembly. During the tightening process, measure the distance between the ring flange 4 and the base flange 1 at the four tie rods 2, and adjust the pre-tightening force of the four hexagonal flange nuts 3 according to the measurement results. , and finally ensure that the distance between the flanges of the four tie rods is kept within 0.5mm, use the circlip pliers to take out the circlip 17, loosen the four hexagonal flange nuts 3 evenly, remove the ring flange 4, and remove the moving ring assembly Replace the locating ring 15 and the moving ring 10 on the moving ring 10, and replace the O-ring 14 in the moving ring 10;

Step (2) Reinstall the moving ring 10 and the positioning ring 15 in sequence, place the moving ring assembly on the base flange 1, place the drive shaft 9 in the positioning hole 5 of the base flange, and install the ring with the hard graphite sealing ring facing up. Flange 4, align the center of the ring flange 4 with the center of the moving ring 10, install the four hexagonal flange nuts 3 on the tie rod 2, and tighten the four hexagonal flange nuts 3 crosswise to make the ring flange 4 evenly pressed The moving ring exposes the circlip groove of the moving ring assembly. During the tightening process, measure the distance between the ring flange 4 and the base flange 1 at the four tie rods 2, and adjust the pre-tightening force of the four hexagonal flange nuts 3 according to the measurement results. , and finally ensure that the distance between the flanges at the four tie rods is kept within 0.5mm. Use the circlip pliers to install the circlip. After the installation is complete, loosen the four hexagonal flange nuts 3 evenly, remove the ring flange 4, and install the moving ring assembly. Remove from base flange 1 and refit to the device.

The special tool has a simple structure and is easy to operate. Since its design and manufacture, it has been successfully applied in the maintenance process of the personnel gate, which effectively improves the efficiency of the O-ring replacement of the moving ring assembly, protects the safety of the hard graphite sealing ring, and reduces the The equipment safety risks in this work provide a guarantee for the smooth development of the personnel gate maintenance work.

This project can be popularized and applied in the related work of the same type of units.

The special tools for disassembly and assembly of mechanical seal moving ring components designed and manufactured in this project can be extended to other similar structures in the power station for mechanical seal maintenance. This project also has a good reference for the maintenance of other similar structural equipment in the same industry.

The present invention has been described in detail above in conjunction with the embodiments, but the present invention is not limited to the above-mentioned embodiments, and within the knowledge scope possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention. The content that is not described in detail in the present invention can use the prior art.

Claims (8)

1. A special tool for disassembly and assembly of a mechanical seal moving ring assembly, characterized in that: the special tool comprises a base flange (1), a tie rod (2), a hexagonal flange nut (3), an annular flange (4), The base flange positioning hole (5), the base flange threaded hole (6), the annular flange through hole (7) and the annular flange center hole (8), the base flange (1) is designed with a base flange positioning hole (5) and the base flange threaded hole (6), the annular flange (4) is designed with an annular flange through hole (7) and an annular flange center hole (8), and one end of the tie rod (2) is connected to the base flange ( 1), the other end of the tie rod (2) is connected with the annular flange (4). 2. A special tool for disassembly and assembly of a mechanical seal moving ring assembly according to claim 1, characterized in that: the tie rod (2) passes through the annular flange through hole (7) and passes through the hexagonal flange nut (3). ) and the ring flange (4) are fixedly connected. 3. A special tool for disassembly and assembly of a mechanical seal moving ring assembly according to claim 2, characterized in that: four base flange threaded holes (6) are evenly distributed around the base flange (1) . 4. A special tool for disassembly and assembly of a mechanical seal moving ring assembly according to claim 3, wherein the base flange positioning hole (5) is located at the center of the base flange (1). 5. A special tool for disassembly and assembly of a mechanical seal moving ring assembly according to claim 4, characterized in that: the tie rod (2) has threads distributed at both ends, and one end is connected to the base flange threaded hole (6) , and the other end is connected with the hexagon flange nut (3). 6. A special tool for disassembly and assembly of a mechanical seal moving ring assembly according to claim 5, characterized in that: four annular flange through holes (7) are evenly distributed around the annular flange (4) . 7. A special tool for disassembly and assembly of a mechanical seal moving ring assembly according to claim 6, wherein the annular flange center hole (8) is located at the center of the annular flange (4). 8. The method for disassembling and assembling a mechanical seal moving ring assembly according to any one of claims 1 to 7, wherein the method specifically comprises the following steps: Step (1) Apply a layer of grease on the threads, place the base flange (1) flat on the workbench, screw the four tie rods (2) onto the base flange (1), and then turn it half a turn after screwing it to the bottom. , put the moving ring assembly to be disassembled on the base flange (1), the drive shaft (9) is placed in the base flange positioning hole (5), the hard graphite sealing ring is facing upward, and the annular flange (4) is installed, Align the center of the ring flange (4) with the center of the moving ring (10), install the four hexagonal flange nuts (3) on the tie rod (2), and tighten the four hexagonal flange nuts (3) crosswise to make the ring Press the moving ring evenly to expose the retaining ring groove of the moving ring assembly, measure the distance between the ring flange (4) and the base flange (1), and adjust the preload of the four hexagonal flange nuts (3) according to the measurement results. Finally, ensure that the flange distance deviation at the four tie rods (2) is kept within 0.5mm, use the circlip pliers to take out the circlip (17), loosen the four hexagonal flange nuts (3) evenly, and remove the ring flange (4), remove the positioning ring (15) and the moving ring (10) on the moving ring assembly, and replace the O-ring (14) in the moving ring (10); Step (2) Reinstall the moving ring (10) and the positioning ring (15) in sequence, place the moving ring assembly on the base flange (1), and place the drive shaft (9) in the base flange positioning hole (5) , with the hard graphite sealing ring facing up, install the ring flange (4), align the center of the ring flange (4) with the center of the moving ring (10), and install the four hexagonal flange nuts (3) on the tie rod (2) , Tighten the four hexagonal flange nuts (3) crosswise, so that the annular flange (4) evenly presses the moving ring and exposes the retaining ring groove of the moving ring assembly. During the tightening process, measure the ring at the four pull rods (2). The distance between the flange (4) and the base flange (1), adjust the pre-tightening force of the four hexagonal flange nuts (3) according to the measurement results, and finally ensure that the flange distance deviation at the four tie rods is kept within 0.5mm. Install the circlip with the circlip pliers. After the installation is complete, loosen the four hexagonal flange nuts (3) evenly, remove the ring flange (4), take the moving ring assembly out of the base flange (1) and install it back to the equipment superior.

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