Centering coupling device for detecting J-shaped welding seam of RPV top cover penetration piece

Abstract

The utility model belongs to the technical field of auxiliary tools of detection devices, and discloses a centering coupling device for detecting a J-shaped welding seam of an RPV top cover penetration piece, which comprises a centering sealing device and a fixing assembly, one end of the centering sealing device is fixed on a tray of the detection device through the fixing assembly; the centering sealing device is provided with a sealing cavity, and a probe of the detection device is located in the middle of the sealing cavity; a centering connecting part is arranged at the other end of the centering sealing device; and the centering sealing device can be connected with the CRDM pipe through the centering connecting part. According to the utility model, the probe of the detection device can be quickly centered, and the coupling effect of a water spraying method can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of auxiliary tooling for detection devices, and particularly relates to a centering coupling device for detecting J-shaped welds of RPV top cover penetration pieces. Background Art

[0002] The reactor pressure vessel of a nuclear power plant, in English, is called Reactor Pressure Vessel, or RPV for short; the control rod drive mechanism of the nuclear island of a nuclear power plant, in English, is called Control Rod Drive Mechanism, or CRDM for short.

[0003] The design documentation for the RPV roof J-weld requires automated ultrasonic testing after water pressure testing. Currently, automated ultrasonic testing of the J-weld on the RPV roof CRDM tube requires first inserting the test probe into the CRDM tube and performing alignment adjustments to ensure proper coupling during scanning. Alignment is performed manually, and coupling is achieved by spraying water to couple the probe and workpiece. Existing alignment and coupling methods have the following drawbacks:

[0004] (1) Manual centering adjustment takes a long time, it is difficult to determine whether it is completely aligned, and the signal-to-noise ratio of the collected signal is poor;

[0005] (2) When coupling with the water spray method, bubbles exist and the signal is easily affected by the water flow, resulting in unstable signals.

[0006] Currently, there is a lack of a centering coupling device for detecting J-type welds of RPV top cover penetrations to achieve rapid centering of the detection device probe and improve the coupling effect of the water spray method.

[0007] Therefore, a new technology is needed to solve the problem in the prior art of lacking a centering coupling device for detecting the J-type weld of the RPV top cover penetration piece. Utility Model Content

[0008] In order to solve the above problems in the prior art, the utility model provides a centering coupling device for detecting J-type welds of RPV top cover penetrations, which can realize rapid centering of the detection device probe and improve the coupling effect of the water spray method.

[0009] The utility model adopts the following technical solutions:

[0010] A centering coupling device for detecting J-type welds of RPV top cover penetrations comprises a centering sealing device and a fixing assembly; one end of the centering sealing device is fixed to a tray of a detection device via the fixing assembly; the centering sealing device has a sealed cavity, and a probe of the detection device is centrally located in the sealed cavity; the other end of the centering sealing device is provided with a centering connection portion; the centering sealing device can be connected to a CRDM pipe via the centering connection portion.

[0011] Furthermore, the centering connection portion is an annular recess;

[0012] The inner diameter of the annular recess is consistent with the inner diameter of the CRDM tube;

[0013] The outer diameter of the annular recess is larger than the outer diameter of the CRDM tube.

[0014] Furthermore, the outer diameter of the annular recess is 1 mm larger than the outer diameter of the CRDM tube.

[0015] Furthermore, the centering sealing device includes a first centering seal, a second centering seal and a locking assembly;

[0016] The first centering seal has a first cavity and a first engaging portion;

[0017] The second centering seal has a second cavity and a second engaging portion;

[0018] The first mating portion and the second mating portion can be mated and connected via the locking assembly; after the mating connection, the first cavity and the second cavity can form the sealed cavity.

[0019] Furthermore, it also includes a plurality of sealing strips; the plurality of sealing strips include a first sealing strip, a second sealing strip and a third sealing strip;

[0020] The first sealing strip is provided at the joint between the first joining portion and the second joining portion;

[0021] The second sealing strip is provided at the contact connection between the first pair of sealing members and the detection device tray, and the second sealing strip is provided at the contact connection between the second pair of sealing members and the detection device tray;

[0022] The third sealing strip is provided at the connection between the centering connection portion and the CRDM tube.

[0023] Furthermore, the first engaging portion and the second engaging portion are both vertical bars of the shaft body;

[0024] The vertical bars of the shaft body are all provided with connection holes for matching connection.

[0025] Further, the locking assembly includes a first tightening bolt;

[0026] The first mating portion and the second mating portion can be mated and connected by the first tightening bolt.

[0027] Further, the fixing assembly includes a fixing plate, a first fastener and a second fastener;

[0028] The fixing plate is fixed to one end of the centering sealing device by the first fastener;

[0029] The fixing plate is fixed to the tray of the detection device through the second fastener, and one end of the centering sealing device is sealed and connected to the tray of the detection device.

[0030] Further, the first fastener is a second tightening bolt;

[0031] The second fastening member is a third tightening bolt.

[0032] Furthermore, a first notch is provided at one end of the first centering seal;

[0033] A second notch is provided at one end of the second centering seal;

[0034] When the fixing plate of the fixing assembly is fixed in the first missing position, the bottom end surface of the fixing plate of the fixing assembly is flush with the end surface of the first centering seal;

[0035] When the fixing plate of the fixing assembly is fixed in the second missing position, the bottom end surface of the fixing plate of the fixing assembly is flush with the end surface of the second centering seal.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] The centering coupling device of the present invention includes a centering sealing device and a fixing assembly. One end of the centering sealing device is fixed to the tray of the detection device through the fixing assembly, and the probe of the detection device is centered in the sealing cavity (upper / middle). The other end of the centering sealing device is connected to the CRDM tube through the centering connection part, thereby realizing rapid centering of the probe of the detection device; at the same time, the present invention improves the coupling effect of the water spray method by filling the sealing cavity and the CRDM tube with water, which helps to ensure signal stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The technology of the utility model is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0039] Figure 1 This is a three-dimensional schematic diagram of the centering coupling device of the utility model being arranged on a tray of a detection device, with the probe of the detection device being centered in a sealed cavity;

[0040] Figure 2 yes Figure 1 Front view of

[0041] Figure 3 yes Figure 2 A top view of

[0042] Figure 4 yes Figure 3 Cross-sectional view at EE.

[0043] Reference numerals:

[0044] 1-centering seal; A-seal cavity; B-centering connection; D1-inner diameter; D2-outer diameter; 11-first centering seal; 111-first cavity; 112-first mating portion; 113-first missing portion; 12-second centering seal; 121-second cavity; 122-second mating portion; 123-second missing portion; 13-locking assembly; C-connecting hole; EE-section symbol;

[0045] 2-fixing assembly; 21-fixing plate; 22-first fastener; 23-second fastener;

[0046] 3-Pallet;

[0047] 4-Probe. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other unless there is a conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0049] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. In addition, the terms "upper," "lower," "left," and "right" used in this utility model are only used with respect to the relative positions of the components of the utility model in the accompanying drawings.

[0050] Reference Figures 1 to 4A centering coupling device for detecting J-type welds of RPV top cover penetrations comprises a centering sealing device 1 and a fixing assembly 2; one end of the centering sealing device 1 is fixed to a tray 3 of a detection device through the fixing assembly 2; the centering sealing device 1 has a sealing cavity A, and the probe 4 of the detection device is centrally located in the sealing cavity A (upper / middle); the other end of the centering sealing device 1 is provided with a centering connection portion B; the centering sealing device 1 can be connected to a CRDM pipe through the centering connection portion B. Wherein, as a part of the (automatic ultrasonic) detection device, the tray can be raised and lowered and can be moved together with the (automatic ultrasonic) detection device; as a part of the (automatic ultrasonic) detection device, the probe is integrated with a probe and a water supply device (such as a pump), and can be rotated and moved up and down for scanning. The utility model effectively solves the problems of inaccurate centering, poor coupling, poor signal-to-noise ratio, and unstable signal during the ultrasonic detection of RPV top cover CRDM pipes.

[0051] Reference Figures 1 to 4 In one embodiment, the centering connection portion B is an annular recess;

[0052] The inner diameter D1 of the annular recess is consistent with the inner diameter of the CRDM tube;

[0053] The outer diameter D2 of the annular recess is larger than the outer diameter of the CRDM tube.

[0054] In one embodiment, the outer diameter D2 of the annular recess is 1 mm larger than the outer diameter of the CRDM tube.

[0055] Reference Figures 1 to 4 In one embodiment, the centering seal device 1 includes a first centering seal 11, a second centering seal 12 and a locking assembly 13;

[0056] The first centering seal 11 has a first cavity 111 and a first mating portion 112;

[0057] The second centering seal 12 has a second cavity 121 and a second mating portion 122;

[0058] The first mating portion 112 and the second mating portion 122 can be mated and connected via the locking assembly 13 ; after the mating connection, the first cavity 111 and the second cavity 121 can form the sealed cavity A.

[0059] Reference Figures 1 to 4 In one embodiment, it further includes a plurality of sealing strips for preventing water leakage; the plurality of sealing strips include a first sealing strip, a second sealing strip and a third sealing strip;

[0060] The first sealing strip is provided at the joint between the first mating portion 112 and the second mating portion 122;

[0061] The second sealing strip is provided at the contact connection between the first centering seal 11 and the detection device tray 3, and the second sealing strip is provided at the contact connection between the second centering seal 12 and the detection device tray 3;

[0062] The third sealing strip is provided at the connection between the centering connection portion B and the CRDM tube.

[0063] Reference Figures 1 to 4 In one embodiment, the first mating portion 112 and the second mating portion 122 are both vertical bars of the shaft body;

[0064] The vertical bars of the shaft body are all provided with connection holes C for matching connection.

[0065] In one embodiment, the locking assembly 13 includes a first tightening bolt;

[0066] The first mating portion 112 and the second mating portion 122 can be mated and connected by the first tightening bolt.

[0067] Reference Figures 1 to 4 In one embodiment, the fixing assembly 2 includes a fixing plate 21, a first fastener 22 and a second fastener 23;

[0068] The fixing plate 21 is fixed to one end of the centering sealing device 1 by the first fastener 22;

[0069] The fixing plate 21 is fixed to the tray 3 of the detection device through the second fastener 23 , and one end of the centering sealing device 1 is sealed to the tray 3 of the detection device.

[0070] Reference Figures 1 to 4 In one embodiment, the first fastener 22 is a second tightening bolt;

[0071] The second fastener 23 is a third tightening bolt.

[0072] Reference Figures 1 to 4 In one embodiment, a first missing portion 113 is provided at one end of the first centering seal 11;

[0073] A second notch 123 is provided at one end of the second centering seal 12;

[0074] When the fixing plate 21 of the fixing assembly 2 is fixed in the first vacant position 113 , the bottom end surface of the fixing plate 21 of the fixing assembly 2 is flush with the end surface of the first centering seal 11 ;

[0075] When the fixing plate 21 of the fixing assembly 2 is fixed in the second absence 123 , the bottom end surface of the fixing plate 21 of the fixing assembly 2 is flush with the end surface of the second centering seal 12 .

[0076] In one embodiment, a method for using a centering coupling device includes the following steps:

[0077] S1. Stick the sealing strips on the corresponding positions of the first centering seal 11 and the second centering seal 12 of the centering coupling device;

[0078] S2. Connect the fixing plate 21 to the first centering seal 11 and the second centering seal 12 of the centering seal device respectively;

[0079] S3. Sleeve the first centering seal 11 and the second centering seal 12 of the centering coupling device onto the periphery of the probe 4 so that the probe 4 is centered in the sealed cavity A (upper / middle), and lock the first centering seal 11 and the second centering seal 12 with the locking assembly 13;

[0080] S4, fixing the fixing plate 21 to the tray 3;

[0081] S5. Connect the centering connection part B of the centering coupling device to the CRDM tube of the inspected object, thereby achieving centering of the detection device and the CRDM tube of the inspected object;

[0082] S6. Use the pump on probe 4 to inject water and then start scanning.

[0083] In one embodiment, the present invention is used for automatic ultrasonic scanning of the RPV top cover CRDM pipe of the ACPR50S platform project, effectively solving the centering problem and improving the coupling problem of the water spray method, and improving the inspection efficiency by 100%.

[0084] For other details of the centering coupling device for detecting J-shaped welds of RPV top cover penetration pieces described in the present invention, please refer to the prior art and will not be described in detail here.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A centering coupling device for detecting J-type welds of RPV roof penetrations, characterized in that: It includes a centering sealing device and a fixing assembly; one end of the centering sealing device is fixed to the tray of the detection device through the fixing assembly; the centering sealing device has a sealing cavity, and the probe of the detection device is centrally located in the sealing cavity; the other end of the centering sealing device is provided with a centering connection portion; through the centering connection portion, the centering sealing device can be connected to the CRDM tube.

2. The centering coupling device for detecting J-type welds of RPV roof penetrations according to claim 1, characterized in that: The centering connection portion is an annular recess; The inner diameter of the annular recess is consistent with the inner diameter of the CRDM tube; The outer diameter of the annular recess is larger than the outer diameter of the CRDM tube.

3. The centering coupling device for detecting J-type welds of RPV roof penetrations according to claim 2, characterized in that: The outer diameter of the annular recess is 1 mm larger than the outer diameter of the CRDM tube.

4. The centering coupling device for detecting J-shaped welds of RPV roof penetrations according to claim 1, characterized in that: The centering seal device includes a first centering seal, a second centering seal and a locking assembly; The first centering seal has a first cavity and a first engaging portion; The second centering seal has a second cavity and a second engaging portion; The first mating portion and the second mating portion can be mated and connected via the locking assembly; after the mating connection, the first cavity and the second cavity can form the sealed cavity.

5. The centering coupling device for detecting J-type welds of RPV roof penetrations according to claim 4, characterized in that: It also includes a plurality of sealing strips; the plurality of sealing strips include a first sealing strip, a second sealing strip and a third sealing strip; The first sealing strip is provided at the joint between the first joining portion and the second joining portion; The second sealing strip is provided at the contact connection between the first pair of sealing members and the detection device tray, and the second sealing strip is provided at the contact connection between the second pair of sealing members and the detection device tray; The third sealing strip is provided at the connection between the centering connection portion and the CRDM tube.

6. The centering coupling device for detecting J-type welds of RPV roof penetrations according to claim 4, characterized in that: The first engaging portion and the second engaging portion are both vertical bars of the shaft body; The vertical bars of the shaft body are all provided with connection holes for matching connection.

7. The centering coupling device for detecting J-shaped welds of RPV roof penetrations according to claim 4, characterized in that: The locking assembly includes a first tightening bolt; The first mating portion and the second mating portion can be mated and connected by the first tightening bolt.

8. The centering coupling device for detecting J-shaped welds of RPV roof penetrations according to claim 1, characterized in that: The fixing assembly includes a fixing plate, a first fastener and a second fastener; The fixing plate is fixed to one end of the centering sealing device by the first fastener; The fixing plate is fixed to the tray of the detection device through the second fastener, and one end of the centering sealing device is sealed and connected to the tray of the detection device.

9. The centering coupling device for detecting J-shaped welds of RPV roof penetrations according to claim 8, characterized in that: The first fastener is a second tightening bolt; The second fastening member is a third tightening bolt.

10. The centering coupling device for detecting J-type welds of RPV roof penetrations according to claim 4, characterized in that: A first notch is provided at one end of the first centering seal; A second notch is provided at one end of the second centering seal; When the fixing plate of the fixing assembly is fixed in the first missing position, the bottom end surface of the fixing plate of the fixing assembly is flush with the end surface of the first centering seal; When the fixing plate of the fixing assembly is fixed in the second missing position, the bottom end surface of the fixing plate of the fixing assembly is flush with the end surface of the second centering seal.

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