False insert structure for flow-induced vibration test of top plate of reactor core shroud and mounting method

Abstract

The invention provides a false insert structure for a reactor core shroud top plate flow-induced vibration test and an installation method. The false insert structure comprises a false insert, a positioning plate, a displacement sensor target block, a displacement sensor, an acceleration sensor and a sensor cover plate, the false insert is fixedly mounted on the reactor core shroud top plate; the positioning plate is connected with the hanging basket barrel; the displacement sensor target block is fixed on the positioning plate; the displacement sensor is arranged on the upper surface of the false insert and is close to the displacement sensor target block, and a detection end on one side of the displacement sensor is opposite to the displacement sensor target block; the acceleration sensor is arranged on the side surface of the false insert; the sensor cover plate is provided with a first lead groove, the sensor cover plate is arranged on the upper surface of the false insert, and the first lead groove is used for placing a lead of the displacement sensor. According to the invention, the lead can be stably transited to the outside of the reactor pressure vessel, and the lead and the sensor are protected from direct impact of water flow during a flow-induced vibration test.

Description

Technical Field

[0001] The present invention relates to the technical field of flow-induced vibration test of the core shroud, and particularly relates to a flow-induced vibration test dummy insert structure for the top plate of the core shroud and an installation method thereof. Background Art

[0002] Before the in-core components of the reactor are used, flow-induced vibration tests need to be carried out to verify the design parameters and objectives. The core shroud is one of the components with relatively large vibrations. The top plate above the core shroud may collide and rub against the positioning plate, and it is necessary to test and quantitatively determine the displacement. The test is measured by displacement sensors and acceleration sensors, and the relevant sensors need to be installed on the dummy insert.

[0003] At the same time, the sensor leads need to be fixed and led out of the reactor pressure vessel. The existing dummy insert structure is difficult to make the leads smoothly transition to the outside of the reactor pressure vessel, and it is also unable to well protect the leads and sensors from the direct impact of water flow.

[0004] In view of this, the inventors of the present application have designed a flow-induced vibration test dummy insert structure for the top plate of the core shroud and an installation method thereof in order to overcome the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that in the prior art, the dummy insert structure for performing the flow-induced vibration test is difficult to make the leads smoothly transition to the outside of the reactor pressure vessel, and it is also unable to well protect the leads and sensors from the direct impact of water flow, and to provide a flow-induced vibration test dummy insert structure for the top plate of the core shroud and an installation method thereof.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a flow-induced vibration test dummy insert structure for the top plate of the core shroud, which is characterized in that the flow-induced vibration test dummy insert structure for the top plate of the core shroud includes: a dummy insert, a positioning plate, a displacement sensor target block, a displacement sensor, an acceleration sensor, and a sensor cover plate; the dummy insert is fixedly installed on the top plate of the core shroud; the positioning plate is connected to the basket cylinder; the displacement sensor target block is fixed on the positioning plate; the displacement sensor is arranged on the upper surface of the dummy insert, the displacement sensor is close to the displacement sensor target block, and the detection end on one side of the displacement sensor faces the displacement sensor target block; the acceleration sensor is arranged on the side surface of the dummy insert; the sensor cover plate is provided with a first lead groove, the sensor cover plate is arranged on the upper surface of the dummy insert, and the first lead groove is used for placing the leads of the displacement sensor.

[0008] According to one or more embodiments of the present invention, the flow-induced vibration test dummy insert structure of the core barrel top plate further includes a lead clamp, which is arranged on the upper surface and the side surface of the dummy insert, and is used for fixing the leads of the acceleration sensor and the displacement sensor.

[0009] According to one or more embodiments of the present invention, the side surface of the core barrel top plate has a groove, the dummy insert is arranged at the edge of the groove, and the positioning plate passes through the groove.

[0010] According to one or more embodiments of the present invention, the side surface of the dummy insert has a first groove portion, the acceleration sensor is arranged in the first groove portion, and a second lead groove is further arranged at the lead outlet of the acceleration sensor on the side surface of the dummy insert, and the second lead groove communicates with the first groove portion.

[0011] According to one or more embodiments of the present invention, a convex block is arranged laterally on the dummy insert, the upper surface of the convex block is an inclined surface, and the lead clamp is arranged on the upper surface and the side surface of the convex block.

[0012] According to one or more embodiments of the present invention, the displacement sensor target block includes a connecting plate and a target block body, and the connecting plate and the target block body are magnetic.

[0013] According to one or more embodiments of the present invention, the sensor cover plate is arranged on the other side of the displacement sensor opposite to the displacement sensor target block.

[0014] According to one or more embodiments of the present invention, a first connecting hole is arranged on the dummy insert, and a second connecting hole is arranged on the core barrel top plate. Screws pass through the first connecting hole and the second connecting hole to fixedly install the dummy insert on the core barrel top plate.

[0015] According to one or more embodiments of the present invention, a first recessed portion is arranged at the bottom of the sensor cover plate, and the first recessed portion is used for accommodating the head of the screw.

[0016] According to one or more embodiments of the present invention, a second recessed portion is arranged at the bottom of the sensor cover plate near the displacement sensor, and the second recessed portion is used for accommodating the protruding structure on the side surface of the displacement sensor.

[0017] According to one or more embodiments of the present invention, the second recessed portion communicates with the first lead groove.

[0018] The present invention also provides a method for installing a flow-induced vibration test dummy insert structure for the top plate of the core shroud, characterized in that the installation method is used to install the flow-induced vibration test dummy insert structure for the top plate of the core shroud as described above, and the installation method includes the following steps: S1. Install the dummy insert on the top plate of the core shroud, and install the positioning plate and the displacement sensor target block; S2. Install the displacement sensor and the acceleration sensor on the dummy insert, and arrange and fix the leads of the acceleration sensor and the displacement sensor; S3. Install the sensor cover plate.

[0019] The positive and progressive effects of the present invention are as follows:

[0020] The flow-induced vibration test dummy insert structure for the top plate of the core shroud and the installation method of the present invention have the following many advantages:

[0021] First, the relative displacement between the top plate of the core shroud and the positioning plate under flow-induced vibration is measured by a magnetic displacement sensor and a target material. The target material is installed on the positioning plate, and the sensor is installed on the dummy insert.

[0022] Second, the structural design and installation method of the dummy insert enable it to smoothly lead the leads in two directions to the top plate of the core shroud at the same time, avoiding damage to the leads by the sharp edges of the components.

[0023] Third, the design and installation method of the sensor cover plate avoid the sensor from being impacted by excessive water flow, and a lead groove is designed therein to avoid too small a bending radius of the leads. Description of the Drawings

[0024] The above-mentioned and other features, properties and advantages of the present invention will become more obvious through the following description in conjunction with the drawings and embodiments. In the drawings, the same reference numerals always represent the same features, where:

[0025] Figure 1 is a three-dimensional schematic view of the installation state of the flow-induced vibration test dummy insert structure for the top plate of the core shroud of the present invention.

[0026] Figure 2 is a top view schematic view of the installation state of the flow-induced vibration test dummy insert structure for the top plate of the core shroud of the present invention.

[0027] Figure 3 is a three-dimensional schematic view of the disassembled state of the sensor cover plate of the flow-induced vibration test dummy insert structure for the top plate of the core shroud of the present invention.

[0028] Figure 4 is a structural schematic view of the dummy insert in the flow-induced vibration test dummy insert structure for the top plate of the core shroud of the present invention.

[0029] Figure 5 is a schematic view of the top plate structure of the core shroud applying the flow-induced vibration test dummy insert structure for the top plate of the core shroud of the present invention.

[0030] Figure 6 It is a schematic structural diagram of a sensor cover plate in the structure of a flow-induced vibration test dummy insert for the top plate of the reactor core shroud of the present invention.

[0031] Figure 7 It is a schematic structural diagram of a displacement sensor target block in the structure of a flow-induced vibration test dummy insert for the top plate of the reactor core shroud of the present invention.

[0032]

Reference Signs

[0033] Dummy insert 100

[0034] First groove part 110

[0035] Second lead wire groove 111

[0036] First connection hole 120

[0037] Boss 130

[0038] First threaded hole 140

[0039] Second threaded hole 150

[0040] Third threaded hole 160

[0041] Positioning plate 200

[0042] Displacement sensor target block 300

[0043] Connection plate 310

[0044] Target block body 320

[0045] Displacement sensor target block screw 330

[0046] Displacement sensor 400

[0047] Acceleration sensor 500

[0048] Sensor cover plate 600

[0049] First lead wire groove 610

[0050] First recessed part 620

[0051] Second recessed part 630

[0052] First through hole 640

[0053] Reactor core shroud top plate 700

[0054] Groove 710

[0055] Second connection hole 720

[0056] Lead clamp 800 Detailed implementation manners

[0057] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings.

[0058] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present invention will now be described in detail, and examples thereof are shown in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts.

[0059] In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the present description.

[0060] In addition, it is required to understand the present invention not only through the actual terms used, but also through the meaning implied by each term. At the same time, for the convenience of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship.

[0061] Refer to Figures 1 to 7 , the present invention provides a structure of a test dummy insert for flow-induced vibration of the upper plate of the core shroud. The structure of the test dummy insert for flow-induced vibration of the upper plate of the core shroud includes: a dummy insert 100, a positioning plate 200, a displacement sensor target block 300, a displacement sensor 400, an acceleration sensor 500, and a sensor cover plate 600;

[0062] The dummy insert 100 is fixedly installed on the upper plate 700 of the core shroud. The positioning plate 200 is connected to the basket cylinder. The displacement sensor target block 300 is fixed on the positioning plate 200. The displacement sensor 400 is disposed on the upper surface of the dummy insert 100. The displacement sensor 400 is close to the displacement sensor target block 300. The detection end on one side of the displacement sensor 400 faces the displacement sensor target block 300. The acceleration sensor 500 is disposed on the side surface of the dummy insert 100. The sensor cover plate 600 is provided with a first lead groove 610. The sensor cover plate 600 is disposed on the upper surface of the dummy insert 100. The first lead groove 610 is used for placing the lead of the displacement sensor 400.

[0063] It should be noted that in the flow-induced vibration test, the displacement sensor 400 obtains the signal of the position change between it and the displacement sensor target block 300, so as to obtain the displacement of the upper plate 700 of the core shroud during flow-induced vibration. The acceleration sensor 500 is used to measure the acceleration perpendicular to the direction of the positioning plate 200.

[0064] The displacement sensor 400 needs to face the positioning plate 200 and be located in the middle of the positioning plate 200 to measure the displacement of the core shroud in a certain direction. The acceleration sensor 500 is arranged on the side of the false insert 100, which is related to the direction measured by the acceleration sensor 500, and its direction needs to face the positioning plate 200 or the center of the basket cylinder.

[0065] The specific orientation of the installation position of the sensor is related to the sensor structure design. In this test, both the acceleration sensor 500 and the displacement sensor 400 are unidirectional sensors. Generally, the direction pointed by the outer shape of the unidirectional sensor is the direction detected by the sensor. Combining with the outer shape of the sensor box, the current structure has simple and reliable connection, and the structures of the false insert 100 and the sensor cover plate 600 are simple.

[0066] Preferably, the displacement sensor 400 and the acceleration sensor 500 are installed on the false insert 100 by screws, and the screws are meshed and connected with the threaded holes on the false insert 100. The second threaded hole 150 and the third threaded hole 160 are arranged on the false insert 100. The displacement sensor 400 is fixed on the false insert 100 by meshing the screw with the second threaded hole 150, and the acceleration sensor 500 is fixed on the false insert 100 by meshing the screw with the third threaded hole 160.

[0067] It should be noted that after the sensor cover plate 600 is set, it can protect the leads arranged therein and block a certain amount of water flow impact to protect the sensor, avoiding the sensor and its leads from being damaged by falling off due to excessive water flow impact. The design of the first lead groove 610 also avoids the risk of the bending radius of the lead being too small, resulting in insulation layer damage, signal interference or wire breakage. There is a first lead groove 610 on the sensor cover plate 600 for arranging the leads of the displacement sensor 400, and the path of the first lead groove 610 extends until the position lead leaves the sensor cover plate 600.

[0068] The structure of the false insert for the fluid-induced vibration test of the core shroud top plate of the present invention enables the leads to smoothly transition to the outside of the reactor pressure vessel and protects the leads and sensors from direct water flow impact during the fluid-induced vibration test.

[0069] See Figures 1 to 3 , as a preferred embodiment of the structure of the false insert for the fluid-induced vibration test of the core shroud top plate of the present invention, the structure of the false insert for the fluid-induced vibration test of the core shroud top plate further includes a lead clamp 800. The lead clamp 800 is arranged on the upper surface and the side surface of the false insert 100, and the lead clamp 800 is used to fix the leads of the acceleration sensor 500 and the displacement sensor 400.

[0070] It should be noted that the lead clamp 800 forms a fixed path for the leads on the upper surface and the side surface of the false insert 100, enabling the leads to smoothly transition to the outside of the reactor pressure vessel.

[0071] See Figure 5 Figure 5 , as a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core shroud top plate of the present invention, the side surface of the core shroud top plate 700 has a groove 710, the dummy insert 100 is arranged at the edge of the groove 710, and the positioning plate 200 passes through the groove 710.

[0072] Preferably, the structure of the core shroud top plate 700 is as Figure 5 shown, its shape is a circular plate type, hollowed out in the middle to place the fuel assembly, and preferably four grooves 710 are provided around the core shroud top plate 700, each separated by 90°.

[0073] Each groove 710 cooperates with the positioning plate 200 and the dummy insert 100, and the dummy insert 100 is installed on the core shroud top plate 700 by screws. Preferably, some threaded holes are provided at the edge of the groove 710 of the core shroud top plate 700 for installing the dummy insert 100.

[0074] See Figure 4 Figure 4 , as a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core shroud top plate of the present invention, the side surface of the dummy insert 100 has a first groove portion 110, the acceleration sensor 500 is arranged in the first groove portion 110, and a second lead groove 111 is further provided at the wire outlet of the acceleration sensor 500 on the side surface of the dummy insert 100, and the second lead groove 111 communicates with the first groove portion 110.

[0075] It should be noted that the first groove portion 110 plays a protective role for the acceleration sensor 500 arranged therein, and the lead wire is smoothly transitioned to the side surface of the dummy insert 100 through the second lead groove 111.

[0076] See Figure 4 Figure 4 , as a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core shroud top plate of the present invention, a convex block 130 is laterally arranged on the dummy insert 100, the upper surface of the convex block 130 is an inclined surface, and the lead wire clip 800 is arranged on the upper surface and the side surface of the convex block 130.

[0077] It should be noted that the upper surface of the convex block 130 is an inclined surface. After the lead wire of the displacement sensor 400 passes through the first lead groove 610 on the sensor cover plate 600, it is smoothly transitioned along the inclined surface of the upper surface of the convex block 130 to the core shroud top plate 700. The lead wire of the acceleration sensor 500 is smoothly transitioned to the side surface of the dummy insert 100 through the second lead groove 111, and then is led to the core shroud top plate 700 along the side surface of the convex block 130 on the dummy insert 100.

[0078] Preferably, lead wire clips 800 are arranged on the upper surface, the side surface of the convex block 130 and the side surface of the dummy insert 100.

[0079] See Figure 7 , as a preferred embodiment of the flow-induced vibration test dummy block structure of the core shroud top plate of the present invention, the displacement sensor target block 300 includes a connecting plate 310 and a target block body 320, and the connecting plate 310 and the target block body 320 are magnetic.

[0080] It should be noted that the displacement sensor 400 obtains the displacement during flow-induced vibration by measuring the magnetic field change of the displacement sensor 400 caused by the position change of the displacement sensor target block 300 due to the relative displacement between the core shroud top plate 700 and the positioning plate 200 during flow.

[0081] Preferably, the displacement sensor target block 300 is installed on the positioning plate 200 by the displacement sensor target block screw 330. Since the amplitude value of the core shroud top plate 700 under flow-induced vibration is small, and the maximum does not exceed the clearance value between the left and right dummy blocks and the positioning plate 200 (about 0.1 - 0.2 mm), the displacement sensor 400 adopts a Hall displacement sensor.

[0082] Because the Hall sensor has a small measurement range (less than 1 mm), high precision, and non-contact measurement.

[0083] Specifically, the measurement principle of the displacement sensor 400 is as follows: Fix the magnetic material, that is, the displacement sensor target block 300, on the object to be measured, that is, the positioning plate 200. Align the Hall probe on the displacement sensor 400 with the displacement sensor target block 300, and the probe material is a crystal with the Hall effect. Pass a current through the control current terminal of the probe element and place it in a magnetic field with a certain magnetic induction intensity. At this time, an electromotive force will be generated in the direction perpendicular to the current and the magnetic field of the probe element. At this time, keep the control current constant, then the change of the electromotive force is only related to the magnitude of the magnetic induction intensity, and the magnetic induction intensity reflects the distance between the displacement sensor 400 and the magnetic displacement sensor target block 300. When setting the sensor, since the displacement sensor 400 has a directionality and the measurement direction is the displacement change between the core shroud top plate 700 and the positioning plate 200, the sensor direction can only be towards the positioning plate 200.

[0084] Preferably, the acceleration sensor 500 adopts a piezoelectric sensor, and its principle is the piezoelectric effect. The specific principle is as follows: If pressure is applied to the piezoelectric material, it will generate a potential difference, and by measuring the potential difference, the magnitude of the pressure can be obtained.

[0085] Specifically, the piezoelectric element of the acceleration sensor 500 generally consists of two piezoelectric wafers. Electrodes are plated on the two surfaces of the piezoelectric wafer and leads are drawn out. A mass block is placed on the piezoelectric wafer. The mass block is generally made of relatively large metal tungsten or high-specific-gravity alloy. Then, a hard spring or bolts and nuts are used to preload the mass block. The entire assembly is installed in a metal housing of the original base. During measurement, the sensor base is rigidly fixed to the test piece. When the sensor is subjected to a vibration force, since the stiffness of the base and the mass block is quite large, while the mass of the mass block is relatively small, it can be considered that the inertia of the mass block is very small. Therefore, the mass block undergoes the same motion as the base and is subjected to an inertial force in the direction opposite to the acceleration direction.

[0086] In this way, a strain force proportional to the acceleration acts on the piezoelectric wafer. Due to the piezoelectric effect of the piezoelectric wafer, alternating charges (voltages) are generated on its two surfaces. When the acceleration frequency is much lower than the natural frequency of the sensor, the output voltage of the sensor is proportional to the acting force, that is, proportional to the acceleration of the test piece. The output electric quantity is led out from the output end of the sensor and input to the preamplifier, and then the acceleration of the test piece can be measured.

[0087] Since in the fluid-induced vibration test, only the displacement of the core shroud perpendicular to the basket cylinder is concerned, and the displacement along the axis of the basket cylinder is not concerned. Therefore, it is preferred to arrange the displacement sensor 400 and the acceleration sensor 500 in two directions perpendicular to each other by 90° on the top plate 700 of the core shroud. No displacement sensor 400 is arranged in the other two directions, and only the acceleration sensor 500 is arranged. The acceleration sensors 500 on both sides mutually verify the test data.

[0088] See Figure 1 and Figure 2 As a preferred embodiment of the fluid-induced vibration test dummy insert structure of the core shroud top plate of the present invention, the sensor cover plate 600 is arranged on the other side of the displacement sensor 400 opposite to the displacement sensor target block 300.

[0089] The sensor cover plate 600 is arranged on the other side of the displacement sensor 400 opposite to the displacement sensor target block 300, which neither affects the measurement of the displacement sensor 400 nor protects the back side of the displacement sensor 400 to prevent damage to the displacement sensor 400 caused by excessive water flow impact.

[0090] It should be noted that the position where the wire of the acceleration sensor 500 is led out is very close to the surface height of the dummy insert 100, and the flow velocity of the flow field at this place is relatively small compared with other parts. Therefore, the wire clip is directly used to fix on the dummy insert 100, and there is no need to set a cover plate to protect the acceleration sensor 500 and its leads.

[0091] See Figure 4 andFigure 5 As a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core barrel top plate of the present invention, a first connection hole 120 is provided on the dummy insert 100, and a second connection hole 720 is provided on the core barrel top plate 700. Screws pass through the first connection hole 120 and the second connection hole 720 to fixedly install the dummy insert 100 on the core barrel top plate 700.

[0092] Preferably, the first connection holes 120 on the dummy insert 100 are two clearance holes for placing screws, and the corresponding second connection holes 720 on the core barrel top plate 700 are threaded holes.

[0093] See Figure 6 As a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core barrel top plate of the present invention, a first recess 620 is provided at the bottom of the sensor cover plate 600, and the first recess 620 is used to accommodate the head of the screw.

[0094] Figure 6 This is the structure of the bottom surface of the sensor cover plate 600, where the function of the first recess 620 is to prevent interference between the sensor cover plate 600 and the screws installed on the dummy insert 100. The function of the first through hole 640 on the sensor cover plate 600 is to install the screws for fixing the sensor cover plate 600, and the screws are engaged with the first threaded holes 140 on the dummy insert 100.

[0095] See Figure 6 As a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core barrel top plate of the present invention, a second recess 630 is provided at the bottom of the sensor cover plate 600 near the displacement sensor 400, and the second recess 630 is used to accommodate the protruding structure on the side of the displacement sensor 400.

[0096] It should be noted that the second recess 630 is used to accommodate the protruding structure on the side of the displacement sensor 400, so that the sensor cover plate 600 does not interfere with the displacement sensor 400.

[0097] See Figure 6 As a preferred embodiment of the structure of the flow-induced vibration test dummy insert for the core barrel top plate of the present invention, the second recess 630 communicates with the first lead groove 610.

[0098] It should be noted that the second recess 630 communicating with the first lead groove 610 can ensure the smooth extraction of the leads of the displacement sensor 400, while avoiding installation interference and cable damage.

[0099] As described above, the flow-induced vibration test dummy insert structure of the reactor core shroud top plate of the present invention enables the sensor to lead wires smoothly through the design of the dummy insert 100 and the structure of the convex block 130 on the dummy insert 100. The relative displacement measurement in the test is achieved through the cooperation of the displacement sensor 400 and the displacement sensor target block 300. Through the design of the sensor cover plate 600, interference with surrounding components is avoided, and the functions of protecting the sensor and the lead wires can be realized.

[0100] The present invention also provides an installation method for the flow-induced vibration test dummy insert structure of the reactor core shroud top plate. The installation method uses the flow-induced vibration test dummy insert structure described above, and the installation method includes the following steps:

[0101] Step S1: Install the dummy insert 100 on the reactor core shroud top plate 700, and install the positioning plate 200 and the displacement sensor target block 300.

[0102] Step S2: Install the displacement sensor 400 and the acceleration sensor 500 on the dummy insert 100, and arrange and fix the lead wires of the acceleration sensor 500 and the displacement sensor 400.

[0103] Step S3: Install the sensor cover plate 600.

[0104] In summary, the flow-induced vibration test dummy insert structure and the installation method of the reactor core shroud top plate of the present invention have the following advantages:

[0105] First, the relative displacement between the reactor core shroud top plate 700 and the positioning plate 200 under flow-induced vibration is measured by the magnetic displacement sensor 400 and the target material. The target material is installed on the positioning plate 200, and the sensor is installed on the dummy insert 100.

[0106] Second, the structural design and installation method of the dummy insert 100 enable it to lead the lead wires in two directions to the reactor core shroud top plate 700 smoothly, avoiding damage to the lead wires by the sharp edges of the components.

[0107] Third, the design and installation method of the sensor cover plate 600 avoid the sensor from being impacted by excessive water flow, and a lead wire groove is designed therein to avoid too small a bending radius of the lead wire.

[0108] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that these are only examples. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A flow-induced vibration test dummy insert structure for the top plate of a core shroud, characterized in that, The structure of the flow-induced vibration test dummy insert on the top plate of the core shroud includes: a dummy insert, a positioning plate, a displacement sensor target block, a displacement sensor, an acceleration sensor, and a sensor cover plate; The dummy insert is fixedly installed on the top plate of the core shroud; The positioning plate is connected to the basket cylinder; The displacement sensor target block is fixed on the positioning plate; The displacement sensor is arranged on the upper surface of the dummy insert. The displacement sensor is close to the displacement sensor target block, and the detection end on one side of the displacement sensor faces the displacement sensor target block; The acceleration sensor is arranged on the side surface of the dummy insert; The sensor cover plate is provided with a first lead groove. The sensor cover plate is arranged on the upper surface of the dummy insert, and the first lead groove is used for placing the lead of the displacement sensor.

2. The flow-induced vibration test dummy insert structure of the core shroud top plate according to claim 1, characterized in that, The structure of the flow-induced vibration test dummy insert on the top plate of the core shroud further includes a lead clip. The lead clip is arranged on the upper surface and the side surface of the dummy insert, and the lead clip is used for fixing the leads of the acceleration sensor and the displacement sensor.

3. The flow-induced vibration test dummy insert structure of the core barrel top plate according to claim 1, characterized in that, The side surface of the top plate of the core shroud has a groove, the dummy insert is arranged at the edge of the groove, and the positioning plate passes through the groove.

4. The flow-induced vibration test dummy insert structure of the core shroud top plate according to claim 1, characterized in that, The side surface of the dummy insert has a first groove portion. The acceleration sensor is arranged in the first groove portion. A second lead groove is further arranged at the lead outlet of the acceleration sensor on the side surface of the dummy insert, and the second lead groove communicates with the first groove portion.

5. The flow-induced vibration test dummy insert structure of the reactor vessel top plate according to claim 2, characterized in that, The side of the dummy insert is provided with a convex block. The upper surface of the convex block is an inclined surface, and the lead clip is arranged on the upper surface and the side surface of the convex block.

6. The flow-induced vibration test dummy insert structure of the core shroud top plate according to claim 1, characterized in that, The displacement sensor target block includes a connecting plate and a target block body, and the connecting plate and the target block body are magnetic.

7. The flow-induced vibration test dummy insert structure for the upper core barrel plate according to claim 1, characterized in that, The sensor cover plate is arranged on the other side of the displacement sensor opposite to the displacement sensor target block.

8. The flow-induced vibration test dummy insert structure of the upper core barrel plate according to claim 7, characterized in that, A first connecting hole is arranged on the dummy insert, and a second connecting hole is arranged on the top plate of the core shroud. Screws pass through the first connecting hole and the second connecting hole to fixedly install the dummy insert on the top plate of the core shroud.

9. The structure of the flow-induced vibration test dummy insert for the top plate of the core shroud according to claim 8, characterized in that, A first recessed portion is arranged at the bottom of the sensor cover plate, and the first recessed portion is used for accommodating the head of the screw.

10. The flow-induced vibration test dummy insert structure of the core shroud top plate according to claim 8, wherein A second recessed portion is arranged at the bottom of the sensor cover plate near the displacement sensor, and the second recessed portion is used for accommodating the protruding structure on the side surface of the displacement sensor.

11. The flow-induced vibration test dummy insert structure of the core shroud top plate according to claim 10, characterized in that, The second recessed portion communicates with the first lead groove.

12. An installation method for a flow-induced vibration test dummy block structure of a core shroud top plate, characterized in that, The installation method is used to install the structure of the flow-induced vibration test dummy insert on the top plate of the core shroud according to any one of claims 1-11. The installation method includes the following steps: S1. Install the dummy insert on the top plate of the core shroud, and install the positioning plate and the displacement sensor target block; S2. Install the displacement sensor and the acceleration sensor on the dummy insert, and arrange and fix the leads of the acceleration sensor and the displacement sensor; S3. Install the sensor cover plate.

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