Displacement sensor mounting device for nuclear power plant

Abstract

The utility model discloses a nuclear power plant displacement sensor mounting device, which is used for mounting a displacement sensor in a test body of a fuel assembly positioning grillwork and comprises a positioning seat, a connecting seat, a sealing cover, a first sealing element, a second sealing element and a third sealing element. According to the nuclear power plant displacement sensor mounting device, the positioning seat and the connecting seat are arranged, so that the displacement sensor and the nuclear power plant displacement sensor mounting device can be firmly connected, the bottom end face of the displacement sensor and the bottom end face of the positioning seat can be flush, and the measurement accuracy is ensured; meanwhile, by arranging a sealing cover, a first sealing piece, a second sealing piece and a third sealing piece, the overall sealing, waterproof and pressure-resistant performance of the nuclear power plant displacement sensor mounting device is ensured, so that the measurement stability of the displacement sensor is ensured, and the nuclear power plant displacement sensor mounting device is simple in structure and easy and convenient to mount and operate.

Description

Technical Field

[0001] The utility model relates to the field of sensor fixing tooling for nuclear power plants, in particular to a displacement sensor installation device for nuclear power plants. Background Art

[0002] In the primary circuit of a pressurized water reactor (PWR), coolant flow induces vibrations in system components, causing micro-vibrations in the cladding and spacer grids attached to the nuclear fuel rods. These micro-vibrations can lead to fretting wear and radioactive leakage. Corrosion between the spacer grids and the fuel rods has become a major cause of PWR fuel failure. Therefore, it is necessary to study the vibration displacements of the fuel assembly spacer grids under water flow and to obtain the grid's vibration response under different operating conditions to verify that the fuel assembly meets relevant design standards and specifications. During underwater testing of the fuel assembly spacer grid displacement, displacement sensors are required to measure the grid's vibration displacements caused by water flow. However, there is currently a lack of a device to secure these displacement sensors. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a nuclear power plant displacement sensor installation device.

[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing a nuclear power plant displacement sensor installation device for installing the displacement sensor in the test body of the fuel assembly positioning grid, which includes a positioning seat, a connecting seat, a sealing cover, a first sealing member, a second sealing member and a third sealing member;

[0005] The positioning seat is fixedly connected to the test body, the connecting seat is connected to the positioning seat via a fastener, the displacement sensor is connected to the connecting seat, and the sealing cover is connected to the displacement sensor;

[0006] The first sealing member is disposed between the sealing cover and the connecting seat, the second sealing member is disposed between the positioning seat and the connecting seat, and the third sealing member is disposed between the sealing cover and the displacement sensor.

[0007] In some embodiments, the connecting seat includes a base and a mounting body integrally formed with the base, the base is provided with a connecting hole for the fastener to pass through, and the positioning seat is provided with a positioning hole for the mounting body.

[0008] In some embodiments, the number of the connecting holes is eight, and the eight connecting holes are evenly spaced and arranged along the circumferential direction of the base body.

[0009] In some embodiments, the bottom end surface of the positioning seat, the bottom end surface of the mounting body, and the bottom end surface of the displacement sensor are flush with each other.

[0010] In some embodiments, a receiving groove for accommodating the sealing cover is provided on the mounting body.

[0011] In some embodiments, the sealing cover is provided with a through hole for the cable of the displacement sensor to pass through.

[0012] In some embodiments, the displacement sensor is threadedly connected to the connecting seat.

[0013] In some embodiments, the sealing cover is threadedly connected to the displacement sensor.

[0014] In some embodiments, the first seal and the second seal are both O-rings.

[0015] In some embodiments, the fastener is an M14 bolt.

[0016] The implementation of the utility model has the following beneficial effects: the nuclear power plant displacement sensor installation device utilizes the arrangement of the positioning seat and the connecting seat to achieve a firm connection between the displacement sensor and the nuclear power plant displacement sensor installation device, and can also achieve flush installation of the bottom end face of the displacement sensor and the bottom end face of the positioning seat, thereby ensuring measurement accuracy. At the same time, by arranging the sealing cover, the first sealing member, the second sealing member, and the third sealing member, the overall sealing, waterproof, and pressure-resistant performance of the nuclear power plant displacement sensor installation device is ensured, thereby ensuring the measurement stability of the displacement sensor. In addition, the nuclear power plant displacement sensor installation device has a simple structure and is easy to install and operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can derive other relevant drawings based on these drawings without inventive effort. In the drawings:

[0018] Figure 1 It is a schematic diagram of the overall structure of a nuclear power plant displacement sensor installation device in some embodiments of the present utility model;

[0019] Figure 2 It is a structural schematic diagram of the connecting base in some embodiments of the present invention. DETAILED DESCRIPTION

[0020] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the present technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0021] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium, and they can be internal connections between two elements or interactions between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", and "third" are only used to facilitate the description of the present technical solution and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", and "third" can explicitly or implicitly include one or more of these features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] See Figure 1 and Figure 2 , is a nuclear power plant displacement sensor installation device in some embodiments of the present invention, which is used to install a displacement sensor 9 in a test body 7 of a fuel assembly positioning grid. When performing underwater test displacement detection on the fuel assembly positioning grid, the displacement sensor 9 is used to measure the grid vibration displacement caused by the flow of a water medium. This is to study the vibration displacement of the fuel assembly positioning grid caused by the flow of a water medium, obtain the vibration response of the grid under different operating conditions, and verify whether the fuel assembly meets relevant design standards and specifications.

[0023] The nuclear power plant displacement sensor installation device includes a positioning seat 1, a connecting seat 2, a sealing cover 3, a first sealing member 4, a second sealing member 5, and a third sealing member 6. The positioning seat 1 is fixedly connected to the test body 7, the connecting seat 2 is connected to the positioning seat 1 via a fastener 8, the displacement sensor 9 is connected to the connecting seat 2, and the sealing cover 3 is connected to the displacement sensor 9. The first sealing member 4 is provided between the sealing cover 3 and the connecting seat 2, the second sealing member 5 is provided between the positioning seat 1 and the connecting seat 2, and the third sealing member 6 is provided between the sealing cover 3 and the displacement sensor 9.

[0024] It can be understood that the nuclear power plant displacement sensor installation device utilizes the setting of the positioning seat 1 and the connecting seat 2 to achieve a firm connection between the displacement sensor 9 and the nuclear power plant displacement sensor installation device, and can also achieve the bottom end face of the displacement sensor 9 being installed flush with the bottom end face of the positioning seat 1 to ensure measurement accuracy. At the same time, by setting the sealing cover 3, the first sealing member 4, the second sealing member 5 and the third sealing member 6, the overall sealing, waterproof and pressure-resistant performance of the nuclear power plant displacement sensor installation device is ensured, thereby ensuring the measurement stability of the displacement sensor 9. The nuclear power plant displacement sensor installation device has a simple structure and is easy to install and operate.

[0025] The connecting base 2 comprises a base 21 and a mounting body 22 integrally formed with the base 21. The base 21 defines a connecting hole 211 for the fastener 8, while the positioning base 1 defines a positioning hole 11 for the mounting body 22. The fastener 8 can be an M14 bolt to ensure a secure connection between the connecting base 2 and the positioning base 1. There are eight connecting holes 211, evenly spaced along the circumference of the base 21. The number of connecting holes 211 matches the number of fasteners 8. The provision of multiple connecting holes 211 and fasteners 8 enhances the secure connection between the connecting base 2 and the positioning base 1.

[0026] In addition, the bottom end surface of the positioning seat 1, the bottom end surface of the mounting body 22, and the bottom end surface of the displacement sensor 9 are arranged flush with each other, which can ensure the measurement accuracy of the displacement sensor 9.

[0027] The mounting body 22 defines a receiving groove 221 for receiving the sealing cover 3, thereby positioning the sealing cover 3. A first sealing member 4 of a matching model can be placed in the receiving groove 221 of the mounting body 22. The sealing cover 3 also defines a through-hole 31 for threading the cable of the displacement sensor 9. The cable of the displacement sensor 9 can be routed through this through-hole 31 to prevent damage to the cable during tightening, which could affect measurement performance.

[0028] Furthermore, the displacement sensor 9 is threadedly connected to the connecting base 2, and the sealing cover 3 is threadedly connected to the displacement sensor 9. Specifically, the displacement sensor 9 can be screwed into the connecting base 2 via its own M18×1 thread, and the sealing cover 3 can also be threadedly connected to the displacement sensor 9. In other embodiments, the displacement sensor 9 and the connecting base 2, and the sealing cover 3 and the displacement sensor 9 can also be connected via other detachable connection methods, such as bolts or snap fasteners, which are not specifically limited here.

[0029] In addition, the first sealing member 4 and the second sealing member 5 are both O-rings, and the third sealing member 6 is a sealing gasket. The O-ring has a simple structure and is easy to install. Due to its circular cross section, the installation location is compact, the weight is light, and the sealing effect is generated by compression.

[0030] The installation principle of the displacement sensor installation device of the nuclear power plant is:

[0031] 1. The displacement sensor 9 can be screwed into the connecting seat 2 through a thread. After tightening, confirm whether the displacement sensor 9 is installed flush through instrumentation and visual inspection. After confirming that it is installed flush, proceed with subsequent installation work. It should be noted that the displacement sensor 9 should be tightened slowly to avoid damaging the threads on the sensor due to excessive tightening force, which will affect the subsequent sealing performance and measurement use;

[0032] 2. Install the connecting base 2 and displacement sensor 9 onto the positioning base 1 as a whole. Use eight evenly spaced fasteners 8 in conjunction with the second seal 5 to achieve a sealed connection. Tightening the fasteners 8 should follow the principles of diagonal tightening, step-by-step tightening, and slow tightening to avoid seal failure due to uneven force and uneven installation of the bottom end surface of the displacement sensor 9 and the positioning base 1.

[0033] 3. Place a first seal 4 of a matching model at the position of the accommodating groove 221, and place a third seal 6 of a matching model at the sealing surface position between the displacement sensor 9 and the sealing cover 3. The secondary fixation and sealing of the displacement sensor 9 are achieved by tightening the sealing cover 3. The tightening process is also step-by-step and slow. It should be noted that before starting to tighten, the cable at the rear end of the displacement sensor 9 must be passed through the through hole 31 on the sealing cover 3 to avoid damaging the cable of the displacement sensor 9 during the tightening process and affecting the measurement performance.

[0034] The beneficial effects of the nuclear power plant displacement sensor installation device are:

[0035] 1. The displacement sensor 9 is connected to the connecting seat 2 by a thread, and the connecting seat 2 is connected to the positioning seat 1 by a thread, which makes the installation and operation easy;

[0036] 2. By utilizing the arrangement of the sealing cover 3, the first sealing member 4, the second sealing member 5, and the third sealing member 6, multiple sealing measures are provided to form a multi-layer sealing guarantee, thereby effectively improving the waterproof and pressure-resistant performance of the displacement sensor installation device for a nuclear power plant;

[0037] 3. The bottom end surface of the positioning seat 1, the bottom end surface of the mounting body 22, and the bottom end surface of the displacement sensor 9 can be set flush, ensuring the measurement accuracy of the displacement sensor 9;

[0038] 4. The nuclear power plant displacement sensor installation device has a simple structure and is easy to process, reducing test costs;

[0039] 5. The position of the sealing cover 3 or the size of the threaded hole can be adjusted to meet the sealing installation requirements of displacement sensors 9 of different positions or sizes. At the same time, the connection method can be modified to achieve connection and installation with different types of displacement sensors 9, greatly improving the reuse rate of the displacement sensor installation device in nuclear power plants.

[0040] It can be understood that the above embodiments only express the preferred implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A displacement sensor installation device for a nuclear power plant, used for installing a displacement sensor (9) in a test body (7) of a fuel assembly positioning grid, characterized in that: It comprises a positioning seat (1), a connecting seat (2), a sealing cover (3), a first sealing member (4), a second sealing member (5) and a third sealing member (6); The positioning seat (1) is fixedly connected to the test body (7), the connecting seat (2) is connected to the positioning seat (1) via a fastener (8), the displacement sensor (9) is connected to the connecting seat (2), and the sealing cover (3) is connected to the displacement sensor (9); The first sealing member (4) is arranged between the sealing cover (3) and the connecting seat (2), the second sealing member (5) is arranged between the positioning seat (1) and the connecting seat (2), and the third sealing member (6) is arranged between the sealing cover (3) and the displacement sensor (9).

2. The nuclear power plant displacement sensor installation device according to claim 1, characterized in that: The connecting seat (2) comprises a base (21) and a mounting body (22) integrally formed with the base (21); the base (21) is provided with a connecting hole (211) for the fastener (8) to pass through; and the positioning seat (1) is provided with a positioning hole (11) for positioning and mounting the mounting body (22).

3. The nuclear power plant displacement sensor installation device according to claim 2, characterized in that: The number of the connection holes (211) is eight, and the eight connection holes (211) are evenly spaced and arranged along the circumferential direction of the base body (21).

4. The nuclear power plant displacement sensor installation device according to claim 2, characterized in that: The bottom end surface of the positioning seat (1), the bottom end surface of the mounting body (22), and the bottom end surface of the displacement sensor (9) are arranged flush with each other.

5. The nuclear power plant displacement sensor installation device according to claim 2, characterized in that: The mounting body (22) is provided with a receiving groove (221) for receiving the sealing cover (3).

6. The nuclear power plant displacement sensor installation device according to claim 1, characterized in that: The sealing cover (3) is provided with a through hole (31) for the cable of the displacement sensor (9) to pass through.

7. The nuclear power plant displacement sensor installation device according to claim 1, characterized in that: The displacement sensor (9) is threadedly connected to the connecting seat (2).

8. The nuclear power plant displacement sensor installation device according to claim 1, characterized in that: The sealing cover (3) is threadedly connected to the displacement sensor (9).

9. The nuclear power plant displacement sensor installation device according to claim 1, characterized in that: The first sealing member (4) and the second sealing member (5) are both O-rings, and the third sealing member (6) is a sealing gasket.

10. The nuclear power plant displacement sensor installation device according to claim 1, characterized in that: The fastener (8) is an M14 bolt.

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