Nuclear-grade limit switch verification system

Abstract

The utility model discloses a nuclear grade limit switch verification system, comprising a nuclear grade limit switch body, a valve, a support assembly and a simulation magnetic field assembly used for simulating a space interference magnetic field, the nuclear grade limit switch body comprises a trigger device and an induction device, the support assembly comprises a positioning frame installed on the valve and used for fixing the trigger device and a supporting frame used for fixing the induction device, and the positioning frame and the supporting frame are arranged in a separated mode. In the nuclear-grade limit switch verification system, the nuclear-grade limit switch body is installed on a valve, the nuclear-grade limit switch body is supported and fixed by using the support assembly, and the simulation of environmental interference is provided by using the simulation magnetic field assembly. According to the above arrangement, the verification requirements of the nuclear-grade limit switch in a high-temperature, high-vibration and electromagnetic interference environment can be met at the same time, the accuracy and stability of the nuclear-grade limit switch in the verification process can be ensured, and the reliability of the nuclear-grade limit switch can be well verified.

Description

Technical Field

[0001] The utility model relates to the field of nuclear-grade limit switch performance verification, in particular to a nuclear-grade limit switch verification system. Background Art

[0002] Domestic nuclear-grade limit switches have only been tested in laboratories for seismic resistance, radiation resistance, electromagnetic interference resistance, high temperature aging resistance, etc., and lack verification in the real environment on site. It is necessary to find an environment as complex as possible to verify the equipment. The radiation resistance of the equipment only needs to be verified in the laboratory through cumulative doses. For long-term use in vibration environments, high temperature environments, and interference environments, it is necessary to select a suitable environmental location for verification.

[0003] It is now necessary to study a nuclear-grade limit switch verification method that can be tested for a long time in harsh environments to achieve two goals: one is to avoid equipment damage, and the other is to verify the long-term stable operation of the equipment in harsh environments. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a nuclear-grade limit switch verification system.

[0005] The technical solution adopted by the utility model to solve the technical problem is: construct a nuclear-grade limit switch verification system, which includes a nuclear-grade limit switch body, a valve, a bracket assembly, and a simulated magnetic field assembly for simulating a space interference magnetic field;

[0006] The nuclear-grade limit switch body includes a trigger device and a sensing device;

[0007] The bracket assembly comprises a positioning frame installed on the valve and used to fix the trigger device and a supporting frame used to fix the sensing device, and the positioning frame is separated from the supporting frame.

[0008] In some embodiments, the positioning frame is provided with a first positioning hole for installing the trigger device, and the support frame is provided with a second positioning hole for installing the sensing device, and the central axis of the first positioning hole coincides with the central axis of the second positioning hole.

[0009] In some embodiments, a central axis of the first positioning hole and a central axis of the second positioning hole are both arranged parallel to a height direction of the support frame.

[0010] In some embodiments, the support frame includes a base, a connecting seat fixedly connected to the base, and a supporting seat fixedly connected to the connecting seat, the supporting seat is provided with the second positioning hole, and the base is arranged parallel to the supporting seat.

[0011] In some embodiments, the connection seat is fixedly connected with a reinforcing rib in the longitudinal direction, and the reinforcing rib is triangular in shape.

[0012] In some embodiments, a vertical distance between a lower end surface of the base and an upper end surface of the support seat is 130 mm to 150 mm.

[0013] In some embodiments, the thickness of the base, the connecting base, and the supporting base are all 6 mm to 8 mm.

[0014] In some embodiments, the nuclear-grade limit switch verification system further includes a cable connected to the sensing device, wherein a shielding layer is provided on the cable.

[0015] In some embodiments, the simulated magnetic field component includes a walkie-talkie, an electric welder, and a heat blower.

[0016] In some embodiments, a temperature sensor is provided on the support frame.

[0017] The implementation of the utility model has the following beneficial effects: in the nuclear-grade limit switch verification system, the nuclear-grade limit switch body is installed on the valve, and the nuclear-grade limit switch body is supported and fixed by a bracket assembly, and then a simulated magnetic field assembly is used to provide simulation of environmental interference. The above-mentioned arrangement can simultaneously meet the requirements for verification of the nuclear-grade limit switch in a high temperature, high vibration, and electromagnetic interference environment, can ensure the accuracy and stability of the nuclear-grade limit switch during the verification process, can better verify the reliability of the nuclear-grade limit switch, and provide a basis for subsequent formal use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0019] Figure 1 is an application schematic diagram of a nuclear-grade limit switch verification system in some embodiments of the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of a nuclear-grade limit switch verification system in some embodiments of the utility model;

[0021] Figure 3 It is a structural front view of the support frame in some embodiments of the utility model;

[0022] Figure 4 It is a structural side view of a support frame in some embodiments of the utility model. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods 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, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0024] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship 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 intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the 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 the specific circumstances.

[0025] See also Figures 1 to 4 , is a nuclear-grade limit switch verification system in some embodiments of the utility model, which includes a nuclear-grade limit switch body 1, a valve 2, a bracket assembly 3 and a simulated magnetic field assembly. The nuclear-grade limit switch body 1 includes a trigger device 11 and a sensing device 12. The nuclear-grade limit switch body 1 in this embodiment is a magnetic induction proximity switch. The magnetic induction proximity switch is a device or apparatus that has the function of converting magnetic quantity signals into electrical signals. It utilizes the transformation relationship between magnetic quantities and other physical quantities and uses the magnetic field as a medium to convert other non-electrical physical quantities into electrical signals. The magnetic induction proximity switch is a non-contact position detection switch. Non-contact position detection will not wear or damage the detection object and has a fast response speed.

[0026] In addition, the valve 2 can be a safety valve on the main steam pipeline. In view of the superior performance of nuclear-grade limit switches in terms of radiation resistance, high temperature resistance, shock resistance, and interference resistance, it is necessary to select an environment with high temperature, vibration, and large interference. After screening, the limit switch is selected to be installed on the safety valve on the main steam pipeline for verification.

[0027] The main considerations for choosing this location were:

[0028] 1. There is a lot of vibration at the installation location, and during daily operation, multiple limit switches may be mistriggered due to high vibration.

[0029] 2. The surface temperature of the safety valve reaches about 120°C, and the ambient temperature reaches about 40°C;

[0030] 3. The safety valve is located in the factory building, and the surrounding electromagnetic interference is relatively complex;

[0031] 4. At the same time, considering the accessibility for daily maintenance, do not choose an environment with high radiation dose.

[0032] Further, the bracket assembly 3 includes a positioning frame 31 installed on the valve 2 and used to fix the trigger device 11 and a support frame 32 for fixing the sensing device 12, and the positioning frame 31 and the support frame 32 are separated. It can be understood that the trigger device 11 can move with the movement of the valve 2. When the distance between the trigger device 11 and the sensing device 12 reaches a preset distance, under normal circumstances, the sensing device 12 will sense the trigger action. In view of this, whether the nuclear-grade limit switch body 1 is normal can be determined based on whether the sensing device 12 triggers the action normally. In the initial state, the distance between the trigger device 11 and the sensing device 12 is set to be no less than 4mm.

[0033] For the normal verification process of the nuclear-grade limit switch body 1, as Figure 1 As shown, the positioning frame 31 is provided with a first positioning hole 311 for installing the trigger device 11, and the support frame 32 is provided with a second positioning hole 321 for installing the sensing device 12. The central axis of the first positioning hole 311 coincides with the central axis of the second positioning hole 321, and the central axis of the first positioning hole 311 and the central axis of the second positioning hole 321 are both arranged parallel to the height direction of the support frame 32. The trigger device 11 can be fixed to the positioning frame 31 by a fastener such as a nut, and the sensing device 12 can be fixed to the support frame 32 by a fastener such as a nut.

[0034] like Figure 3 and Figure 4As shown, the support frame 32 includes a base 322, a connecting seat 323 fixedly connected to the base 322, and a supporting seat 324 fixedly connected to the connecting seat 323. The supporting seat 324 is provided with the above-mentioned second positioning hole 321, and the base 322 is arranged in parallel with the supporting seat 324. The connecting seat 323 is fixedly connected with a reinforcing rib 325 in the longitudinal direction, and the reinforcing rib 325 is triangular. More specifically, the support frame 32 is made of high-strength steel as a whole, which is resistant to high temperature, has high strength and rigidity, and can meet the requirements of high temperature resistance and earthquake resistance in the test environment. In this embodiment, the supporting seat 324 is designed in an arc shape, and the base 322, the connecting seat 323, the supporting seat 324, and the reinforcing rib 325 can be connected by welding. The base 322 can be fixed to the ground or the external structure by expansion screws. The overall design of the support frame 32 can enable the support frame 32 to reduce the shaking of the upper part of the support frame 32 caused by vibration in a vibration environment, thereby reducing the influence of the vibration of the support frame 32 on the verification process of the nuclear limit switch.

[0035] Among them, the thickness of the base 322, the connecting seat 323, and the supporting seat 324 are all 6mm to 8mm, and preferably 7mm, which meets the vibration strength requirements, ensures that the entire support frame 32 is fixed and stable, and can further ensure the overall strength and rigidity of the support frame 32.

[0036] like Figure 2 As shown, the nuclear-grade limit switch verification system also includes a cable 4 connected to the induction device 12, and a shielding layer is provided on the cable 4. It can be understood that in order to improve the anti-interference ability, a shielding layer is provided on the cable 4, and the shielding layer is connected to the grounding point nearby and maintains a single-point grounding method. Since the cable 4 will generate a large current when running in the line, and then generate a magnetic field, these magnetic fields may have a great impact on the surrounding components. The existence of the shielding layer of the cable 4 can limit these electromagnetic fields to the inside of the cable 4, thereby protecting the surrounding components from being affected. When the cable 4 is damaged, the leakage current can flow to the grounding grid through the shielding layer, which can effectively protect personal safety and equipment safety, avoid safety accidents caused by short circuits, and can also reduce the impact of external electromagnetic interference on the internal signal transmission of the cable 4, and maintain the stability of the internal signal of the cable 4.

[0037] Furthermore, the vertical distance between the lower end surface of the base 322 and the upper end surface of the support seat 324 is 130 mm to 150 mm, preferably 140 mm. This vertical distance can meet the installation requirement of an installation radius of 10 times the diameter of the cable 4, and can also prevent the cable 4 from contacting the surface of the valve 2.

[0038] Among them, the simulated magnetic field component is used to simulate the space interference magnetic field. The simulated magnetic field component includes a walkie-talkie, an electric welder and a heat blower. The walkie-talkie, the electric welder and the heat blower are all high-power equipment. The above-mentioned high-power equipment or other high-power equipment can be used to simulate the space interference magnetic field to verify the anti-interference ability of the nuclear-grade limit switch and ensure that the nuclear-grade limit switch does not trigger an alarm due to interference.

[0039] In addition, a temperature sensor is provided on the support frame 32, and the temperature sensor is used to measure the temperature on site.

[0040] It can be understood that in the nuclear-grade limit switch verification system, the nuclear-grade limit switch body 1 is installed on the valve 2, and the bracket assembly 3 is used to support and fix the nuclear-grade limit switch body 1, and then the simulated magnetic field assembly is used to provide simulation of environmental interference. The above-mentioned settings can simultaneously meet the requirements for verification of nuclear-grade limit switches in high temperature, high vibration, and electromagnetic interference environments, can ensure the accuracy and stability of the nuclear-grade limit switch during the verification process, can better verify the reliability of the nuclear-grade limit switch, and provide a basis for subsequent formal use.

[0041] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A nuclear-grade limit switch verification system, characterized in that: It comprises a nuclear-grade limit switch body (1), a valve (2), a bracket assembly (3), and a simulated magnetic field assembly for simulating a space interference magnetic field; The nuclear-grade limit switch body (1) comprises a trigger device (11) and a sensing device (12); The support assembly (3) comprises a positioning frame (31) mounted on the valve (2) and used to fix the trigger device (11) and a support frame (32) used to fix the sensing device (12), wherein the positioning frame (31) and the support frame (32) are arranged separately.

2. The nuclear-grade limit switch verification system according to claim 1, characterized in that: The positioning frame (31) is provided with a first positioning hole (311) for installing the trigger device (11), and the support frame (32) is provided with a second positioning hole (321) for installing the sensing device (12), and the central axis of the first positioning hole (311) coincides with the central axis of the second positioning hole (321).

3. The nuclear-grade limit switch verification system according to claim 2, characterized in that: The central axis of the first positioning hole (311) and the central axis of the second positioning hole (321) are both arranged parallel to the height direction of the support frame (32).

4. The nuclear-grade limit switch verification system according to claim 2, characterized in that: The support frame (32) comprises a base (322), a connecting seat (323) fixedly connected to the base (322), and a supporting seat (324) fixedly connected to the connecting seat (323); the supporting seat (324) is provided with the second positioning hole (321); and the base (322) and the supporting seat (324) are arranged in parallel.

5. The nuclear-grade limit switch verification system according to claim 4, characterized in that: The connection seat (323) is fixedly connected with a reinforcing rib (325) in the longitudinal direction, and the reinforcing rib (325) is in a triangular shape.

6. The nuclear-grade limit switch verification system according to claim 4, characterized in that: The vertical distance between the lower end surface of the base (322) and the upper end surface of the support seat (324) is 130 mm to 150 mm.

7. The nuclear-grade limit switch verification system according to claim 4, characterized in that: The thickness of the base (322), the connecting base (323), and the supporting base (324) are all between 6 mm and 8 mm.

8. The nuclear-grade limit switch verification system according to claim 1, characterized in that: The nuclear-grade limit switch verification system further comprises a cable (4) connected to the sensing device (12), wherein a shielding layer is provided on the cable (4).

9. The nuclear-grade limit switch verification system according to claim 1, characterized in that: The simulated magnetic field components include a walkie-talkie, an electric welder, and a hot air blower.

10. The nuclear-grade limit switch verification system according to claim 1, characterized in that: The support frame (32) is provided with a temperature sensor.

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