A foreign object protection umbrella device for VVER horizontal steam generator eddy current inspection

Abstract

The application discloses a foreign matter prevention umbrella device for VVER horizontal steam generator vortex inspection, which comprises a power module, a supporting module and a foreign matter prevention umbrella ring, and the supporting module connects the power module and the foreign matter prevention umbrella ring together. The application has the following advantages: in the VVER horizontal steam generator vortex detection, the design and use of the foreign matter prevention umbrella device can achieve the following effects: 1) the device can be quickly opened and closed, thereby improving the working efficiency of vortex inspection equipment installation and dismounting; 2) the supporting part adopts an upward folding structure, the overall length of the device is shorter after being contracted, and the device is convenient to carry and install; 3) the umbrella cloth is folded upwards and wrapped, so that the foreign matters cannot slide from the edge of the umbrella cloth during the contraction of the umbrella cloth; 4) the workload of the team members is reduced, and the collective radiation dose of equipment installation is reduced; and 5) the ball bearing is replaced, and the pin shaft is changed from a double-side snap spring to a single-side one, so that the foreign matter risk is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of non-destructive testing device for horizontal steam generator of nuclear power plant, and particularly relates to a foreign matter prevention umbrella device for eddy current inspection of VVER horizontal steam generator. BACKGROUND

[0002] In a nuclear power plant, the heat transfer tube of a steam generator is an important component of a primary loop pressure boundary, and the pressure boundary area accounts for more than 70% of the primary loop boundary. The horizontal steam generator adopts a vertical double manifold structure, which is divided into a primary coolant inlet manifold and a primary coolant outlet manifold, and the two manifolds are connected by a horizontally arranged heat transfer tube bundle. Since the wall thickness of the heat transfer tube of the horizontal steam generator is only 1.5 mm and needs to operate under high temperature and high pressure conditions, the heat transfer tube becomes a weak part of the primary loop pressure boundary, and periodic pre-service inspection and in-service inspection of the heat transfer tube of the steam generator are implemented in nuclear power countries at home and abroad.

[0003] To complete the eddy current inspection of the heat transfer tube of the horizontal steam generator, the eddy current inspection equipment needs to be hoisted into the steam generator manifold as a whole. If the equipment parts are loose and fall off during the implementation of the eddy current inspection, foreign matter will be formed in the heat transfer tube, which seriously threatens the safe operation of the nuclear power plant. The foreign matter prevention umbrella has strong centering and stability, and perfectly solves this problem. Therefore, the foreign matter prevention umbrella can not only prevent foreign matter from falling off, but also support and center the lower part of the eddy current inspection equipment, and is an indispensable part of the eddy current inspection equipment. SUMMARY

[0004] The present application aims to provide a foreign matter prevention umbrella device for eddy current inspection of VVER horizontal steam generator, which is driven by air pressure, has rapid and coherent opening and closing action, is easy to install, can significantly improve work efficiency, reduce labor intensity of installers, has good foreign matter prevention effect, and ensures stable and reliable operation of nuclear power units.

[0005] The technical scheme of the present application is as follows: a foreign matter prevention umbrella device for eddy current inspection of VVER horizontal steam generator, comprising a power module, a support module and a foreign matter prevention umbrella ring, wherein the support module connects the power module and the foreign matter prevention umbrella ring together.

[0006] The power module comprises a cylinder body, a pull rod seat and a piston, the cylinder body is provided with the piston, an end plate closes the opening of the cylinder body by fixing screws, the end head of the piston is connected with a push rod, an intermediate shaft is connected with the upper part of the cylinder body, and the top of the cylinder body is fixed on the pull rod seat.

[0007] The pull rod seat and the piston are both made of aluminum alloy.

[0008] The intermediate shaft is provided with a central hole, and compressed air is introduced into the central hole to provide power for the cylinder.

[0009] The support module comprises a pull rod, three pull rods are connected to a pull rod seat, the pull rod seat is connected to one end of each pull rod through a first pin shaft, the other end of each pull rod is connected to a support wheel seat through a second pin shaft, there are three support wheel seats in total, a bearing is connected to each support wheel seat, a support wheel is sleeved on the bearing, an umbrella ring is fixed to the bottom of each support wheel seat through a screw, one end of a support rod is connected to each support wheel seat through a third pin shaft, the other end of the support rod is connected to a push rod through a fourth pin shaft, and a roller is connected to the push rod through a fifth pin shaft.

[0010] The cylinder body, the pull rod seat, the pull rod, the support rod and the support wheel seat are connected through pin shafts to form a four-bar linkage mechanism, and the entire device comprises three four-bar linkage mechanisms, thereby forming stable three-point support.

[0011] The surface of the support wheel is made of soft non-metallic material.

[0012] The umbrella ring is composed of three groups of nine support frames.

[0013] The umbrella ring is made of high-strength metal material.

[0014] An umbrella cloth is installed below the umbrella ring through a hanging piece to receive foreign matters that may fall from above.

[0015] The anti-foreign-matter umbrella device has the following advantages in VVER horizontal steam generator vortex detection:

[0016] 1) The umbrella device can be quickly opened and closed, thereby improving the working efficiency of vortex inspection equipment installation and removal;

[0017] 2) The support part adopts an upward folding structure, and the overall length is shorter after being contracted, thereby facilitating transportation and installation;

[0018] 3) The umbrella cloth is wrapped and folded upward, so that foreign matters cannot slide from the edge of the umbrella cloth during the contraction of the umbrella cloth;

[0019] 4) The workload of the team members is reduced, and the collective radiation dose of equipment installation is reduced;

[0020] 5) The ball bearing is replaced, the pin shaft is changed from a double-sided clamp spring to a single-sided clamp spring, and the risk of foreign matters is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 Fig. 1 is a schematic view of an open state of an anti-foreign-matter umbrella device for VVER horizontal steam generator vortex inspection provided by the present application;

[0022] Fig. 2 A top view of the opened state of an anti-foreign object umbrella-shaped device for eddy current inspection of a VVER horizontal steam generator provided by the present invention.

[0023] Fig. 3 A partial view of an anti-foreign object umbrella-shaped device for eddy current inspection of a VVER horizontal steam generator provided by the present invention.

[0024] In the diagram, 1 is the cylinder block, 2 is the tie rod seat, 3 is the piston, 4 is the tie rod, 5 is the support rod, 6 is the support wheel seat, 7 is the support wheel, 8 is the roller, 9 is the first pin, 10 is the second pin, 11 is the third pin, 12 is the fourth pin, 13 is the fifth pin, 14 is the umbrella ring, 15 is the screw, 16 is the bearing, 17 is the end plate, 18 is the push rod, 19 is the fixing screw, and 20 is the intermediate shaft. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figs. 1-3 As shown, a foreign object prevention umbrella-shaped device for eddy current inspection of a VVER horizontal steam generator includes a power module, a support module, and a foreign object prevention umbrella ring, wherein the support module connects the power module and the foreign object prevention umbrella ring together.

[0027] The power module includes a cylinder body 1, a tie rod seat 2, and a piston 3. The piston 3 is housed within the cylinder body 1. An end plate 17 seals the opening of the cylinder body 1 with fixing screws 19. A push rod 18 is connected to the end of the piston 3. An intermediate shaft 20 is connected to the upper part of the cylinder body 1. Two sealing devices are provided between the intermediate shaft 20 and the upper part of the cylinder body 1. The top of the cylinder body 1 is fixed to the tie rod seat 2. Both the tie rod seat 2 and the piston 3 are made of high-strength metal (aluminum alloy is chosen in this embodiment) to ensure the stability of the module. The intermediate shaft 20 is installed in the center hole of the eddy current inspection equipment base plate and is fixed by a snap ring. The intermediate shaft 20 has a center hole, through which compressed air is introduced to provide power to the cylinder.

[0028] The support module includes a pull rod seat 2 with three pull rods 4 connected to it. The pull rod seat 2 is connected to one end of each pull rod 4 via a first pin 9. The other end of each pull rod 4 is connected to a support wheel seat 6 via a second pin 10. There are three support wheel seats in total. Each support wheel seat 6 is connected to a bearing 16. A support wheel 7 is sleeved on the bearing 16. An umbrella ring 14 is fixed to the bottom of each support wheel seat 6 by a screw 15. Each support wheel seat 6 is also connected to one end of a support rod 5 via a third pin 11. The other end of the support rod 5 is connected to a connecting push rod 18 via a fourth pin 12. The push rod 18 is connected to a roller 8 via a fifth pin 13.

[0029] The cylinder body 1, the pull rod seat 2, the pull rod 4, the support rod 5 and the support wheel seat 6 are connected by the pin shaft and jointly form a four-bar linkage mechanism, and the whole device has three groups of four-bar linkage mechanisms, thereby forming stable three-point support. Moreover, the mechanism can completely wrap the foreign matter in the umbrella cloth when the foreign matter umbrella is closed, and the possibility of falling of the foreign matter when the foreign matter umbrella is closed in the prior art is eliminated. The support wheel 7 rotatably mounted at the end of the support wheel seat 6 can enable the device to move up and down when the device is installed. The support wheel 7 is designed to be slightly higher than the umbrella ring 14 in the installation position, and effectively solves the problem of deformation of the umbrella cloth caused by the umbrella cloth being clamped between the support wheel 7 and the collector pipe wall, thereby ensuring smooth hoisting of the device.

[0030] The surface of the support wheel 7 is made of soft non-metallic material (rubber in the embodiment of the present application), which can ensure that the collector pipe wall is not damaged at the contact position of the support wheel under the premise of ensuring sufficient supporting force. The support wheel 7 is installed at the end of the support wheel seat 6 through the ball bearing and the bearing 16 in the middle of the support wheel 7, so as to ensure good rotation performance of the support wheel 7.

[0031] The umbrella ring 14 is installed below the support wheel seat 6 through the screw 15, and the umbrella ring 14 is composed of three groups of nine support frames to form a complete circle. The umbrella ring 14 is made of high-strength metal material (stainless steel in the embodiment of the present application) to ensure the stability of the umbrella ring after being opened.

[0032] The umbrella cloth is installed below the umbrella ring 14 through a hanging piece, and is used to receive the foreign matter that may fall from above. The umbrella cloth is usually made of flexible waterproof material (waterproof tarpaulin in the embodiment of the present application), which has sufficient strength to ensure that the umbrella cloth will not be damaged during use, and is light, soft and easy to fold.

[0033] The ball bearing connected by the pin shaft 12 is replaced by a copper shaft sleeve, and the ball bearing connected by the pin shaft 13 is replaced by a hard shaft wheel, which effectively avoids the possibility that the ball bearing is damaged and foreign matter is formed due to stress of the foreign matter umbrella during hoisting under the premise that the use effect is not changed.

[0034] The working mode of the present application is as follows:

[0035] The device is hoisted to the bottom of the collecting pipe during use. When the compressed air valve is opened, the gas enters the cylinder 1 to push the piston 3 downward, the bottom of the cylinder body 1 pushes the roller 8 at the end of the support rod 5 downward, so that the support rod 5 is converted from vertical when folded to horizontal, and finally the support module is converted from vertical to horizontal, so that the overall device is expanded to the maximum diameter. The action is rapid, which can greatly reduce the labor intensity of the equipment installation personnel. When the equipment is disassembled, the compressed air valve is closed, the support rod 5 moves downward under the action of gravity and spring tension, the support module is folded upward, and the support wheel is separated from the wall of the collecting pipe. The folding movement of the support module drives the entire umbrella ring and umbrella cloth to fold upward, and finally the foreign matter received in the umbrella cloth is wrapped inside the umbrella cloth. After the whole vortex inspection equipment is hoisted out of the collecting pipe, the foreign matter can be taken out from the umbrella cloth, and the risk of foreign matter falling into the collecting pipe is eliminated.

Claims

1. An anti-foreign body umbrella device for VVER horizontal steam generator eddy current inspection, characterized in that: Including power module, support module and anti-foreign umbrella ring, the support module connects the power module and the anti-foreign umbrella ring together; The power module includes a cylinder body, a pull rod seat and a piston, the piston is arranged in the cylinder body, an end plate closes the opening of the cylinder body by fixing screws, the end head of the piston is connected with a push rod, the upper part of the cylinder body is connected with an intermediate shaft, and the top of the cylinder body is fixed on the pull rod seat; The support module includes a pull rod, three pull rods are connected with the pull rod seat, one end of each pull rod is connected with the pull rod seat through a first pin shaft, the other end of each pull rod is connected with a support wheel seat through a second pin shaft, the support wheel seat has three, each support wheel seat is connected with a bearing, the bearing is sleeved with a support wheel, the bottom of each support wheel seat is fixed with an umbrella ring through screws, and each support wheel seat is also connected with one end of a support rod through a third pin shaft, the other end of the support rod is connected with the push rod through a fourth pin shaft, and the push rod is connected with a roller through a fifth pin shaft;The intermediate shaft is provided with a center hole, and compressed air is introduced into the center hole to provide power for the cylinder;The umbrella cloth is installed below the umbrella ring through a hanging piece and is used for receiving foreign matters that may fall from above;The gas enters the cylinder to drive the piston to move downward, the roller at the end of the support rod at the bottom of the cylinder body is driven to move downward, so that the support rod is turned from vertical to horizontal downward when being folded, and finally drives the support module to be turned from vertical to horizontal upward when being folded, so that the overall device is opened to the maximum diameter.

2. An anti-foreign body umbrella device for eddy current inspection of VVER horizontal steam generators according to claim 1, characterized in that: The pull rod seat and the piston are made of aluminum alloy.

3. An anti-foreign body umbrella device for eddy current inspection of VVER horizontal steam generators according to claim 1, characterized in that: The cylinder body, the pull rod seat, the pull rod, the support rod and the support wheel seat are connected through pin shafts and constitute a four-bar linkage mechanism, and the whole device has three groups of four-bar linkage mechanisms, so as to form stable three-point support.

4. An anti-foreign body umbrella device for eddy current inspection of VVER horizontal steam generators according to claim 1, characterized in that: The surface of the support wheel is made of soft non-metallic material.

5. An anti-foreign body umbrella device for eddy current inspection of VVER horizontal steam generators according to claim 1, characterized in that: The umbrella ring is composed of three groups of nine support frames.

6. An anti-foreign body umbrella device for eddy current inspection of VVER horizontal steam generators according to claim 5, characterized in that: The umbrella ring is made of high-strength metal material.

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