A protection component for the nuclear measurement cable of a nuclear power plant core

Abstract

The present invention belongs to the technical field of the reactor core of a nuclear power plant, and particularly relates to a protection component for a nuclear measurement cable of a nuclear power plant core. The present invention includes a hexagonal mechanism, a rear-end connection nut is arranged at the right end of the hexagonal mechanism, the right end of the rear-end connection nut is threadedly connected to the left end of a front-end straight sleeve, the right end of the front-end straight sleeve is threadedly connected to the left end of a front-end connection nut, sensor outer shells are arranged at the left end of the hexagonal mechanism and the right end of the front-end connection nut respectively, the two sensor outer shells are welded to two stainless steel bellows respectively, a connector plug and a connector socket are arranged inside the right side of the front-end straight sleeve, the right end of the connector plug is connected to the left end of the connector socket, and the left end of the connector plug and the right end of the connector socket are respectively connected to two cables. The present invention can protect the cable connector, prevent it from being exposed to an environment with high temperature, high pressure, high humidity and high cumulative radiation dose for a long time, and prevent the position of the cable connector from being easily corroded and damaged.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power plant reactor cores, and particularly relates to a protection component for a nuclear measurement cable of a nuclear power plant core. Background Art

[0002] The core nuclear measurement system is used to measure the neutron flux in the reactor core and the core outlet temperature. The measurement signals are output to the connector socket on the plug-in board by the core nuclear measurement cable connector assembly at the top of the reactor, and are connected to the core nuclear measurement cable from the containment penetration. Due to the nuclear-grade usage environment requirements of high temperature, high pressure, high humidity, and high cumulative radiation dose, a stainless steel bellows is usually arranged outside the cable to wrap the cable for protection.

[0003] Currently, there is a connector on the cable. Due to the need for plugging and unplugging, a disassembly structure must be set at the plugging and unplugging position of the external stainless steel bellows to expose the internal connector to complete the plugging and unplugging operation.

[0004] For the need of plugging and unplugging at the cable connection plugging and unplugging position, the connector is exposed outside the stainless steel bellows. The connector is exposed to the environment of high temperature, high pressure, high humidity, and high cumulative radiation dose for a long time, making the cable connector position vulnerable to corrosion and damage. Summary of the Invention

[0005] The purpose of the present invention is to provide a protection component for a nuclear measurement cable of a nuclear power plant core, which can protect the cable connector and prevent it from being easily corroded and damaged at the cable connector position due to long-term exposure to the environment of high temperature, high pressure, high humidity, and high cumulative radiation dose.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A protection component for a nuclear measurement cable of a nuclear power plant core includes a hexagonal mechanism. A rear-end connection nut is arranged at the right end of the hexagonal mechanism. The right end of the rear-end connection nut is threadedly connected to the left end of a front-end straight sleeve, and the right end of the front-end straight sleeve is threadedly connected to the left end of a front-end connection nut. Sensor housing bodies are arranged at the left end of the hexagonal mechanism and the right end of the front-end connection nut respectively. The two sensor housing bodies are welded to two stainless steel bellows respectively. A connector plug and a connector socket are arranged inside the right side of the front-end straight sleeve. The right end of the connector plug is connected to the left end of the connector socket. The left end of the connector plug and the right end of the connector socket are respectively connected to two cables.

[0008] A limiting step is provided on the inner wall of the right side of the rear-end connection nut, and a snap ring is provided inside the left side of the front-end connection nut. An O-ring I is arranged in the limiting step, and an O-ring III is arranged in the snap ring.

[0009] The O-ring I and the O-ring III are used to form a seal between the front-end straight sleeve and the rear-end connection nut and the front-end connection nut respectively.

[0010] A rear straight sleeve is provided inside the left side of the front straight sleeve.

[0011] A limiting inclined surface is provided on the outer surface of the left side of the rear straight sleeve, and an O-ring groove is provided on the outer surface of the right side of the rear straight sleeve. An O-ring II is arranged in the O-ring groove, and the O-ring II is used to form a seal with the inner wall of the front straight sleeve.

[0012] The limiting inclined surface contacts with the O-ring I.

[0013] The rear connecting nut is pushed forward to the front straight sleeve and the thread is tightened. The O-ring I is tightened at the limiting step, and at the same time, a double seal is formed between the front straight sleeve and the rear straight sleeve with the O-ring II.

[0014] The front connecting nut and the sensor housing body penetrating through the reactor top are connected by threads. After the threads are tightened, the front straight sleeve presses against the O-ring III on the sensor housing body to form a seal.

[0015] A sealed cavity is jointly formed among the rear straight sleeve and the O-ring I, the front straight sleeve and the O-ring II, and the sensor housing body and the O-ring III.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The present invention provides a protection component for a nuclear power plant reactor core nuclear measurement cable, which can be used in an environment of high temperature, high pressure, high humidity and high cumulative irradiation dose. One end of the protection component is connected to the protection stainless steel corrugated pipe outside the cable, and the other end is connected to the sensor housing body penetrating through the reactor top. The connector at the cable end is inserted into the connector in the reactor top sensor in the protection component, and the protection component provides sealing protection for the internal connector interface; when the connector needs to be plugged or unplugged, the protection component can be separated to expose the internal connector for plugging and unplugging operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : Schematic structural diagram of a protection component for a nuclear power plant reactor core nuclear measurement cable provided by the present invention;

[0019] Figure 2 : Overall view of the auxiliary installation and extraction device;

[0020] Figure 3 : Side schematic view of a single auxiliary installation and extraction device;

[0021] In the figure: 1. Stainless steel bellows; 2. Hexagonal mechanism; 3. Rear connection nut; 4. O-ring I; 5. Rear straight sleeve; 6. O-ring II; 7. Front straight sleeve; 8. Cable; 9. Connector plug; 10. Connector socket; 11. Snap ring; 12. O-ring III; 13. Front connection nut; 14. Sensor housing; 15. Limiting inclined plane; 16. O-ring groove; 17. Limiting step Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] As Figure 1 shown, a protection component for a nuclear power plant core nuclear measurement cable provided by the present invention includes a hexagonal mechanism 2. A rear connection nut 3 is provided at the right end of the hexagonal mechanism 2. The right end of the rear connection nut 3 is threadedly connected to the left end of the front straight sleeve 7. The right end of the front straight sleeve 7 is threadedly connected to the left end of the front connection nut 13. A rear straight sleeve 5 is provided inside the left side of the front straight sleeve 7. As Figure 2 shown, a limiting inclined plane 15 is provided on the outer surface of the left side of the rear straight sleeve 5, and an O-ring groove 16 is provided on the outer surface of the right side of the rear straight sleeve 5. An O-ring II 6 is provided in the O-ring groove 16, and the O-ring II 6 is used to form a seal with the inner wall of the front straight sleeve 7; AsFigure 3 As shown, a limiting step 17 is provided on the inner wall of the right side of the rear connecting nut 3, and snap rings 11 are provided inside the left sides of the front connecting nuts 13. An O-ring one 4 is arranged in the limiting step 17, and an O-ring three 12 is arranged in the snap ring 11. The O-ring one 4 and the O-ring three 12 are used to form seals between the front straight sleeve 7 and the rear connecting nut 3 and the front connecting nut 13 respectively. The limiting inclined surface 15 contacts the O-ring one 4,; A sensor housing 14 is provided at both the left end of the hexagonal mechanism 2 and the right end of the front connecting nut 13. The two sensor housings 14 are respectively welded to the two stainless steel bellows 1. The connector plug 9 and the connector socket 10 are arranged inside the right side of the front straight sleeve 7. The right end of the connector plug 9 is connected to the left end of the connector socket 10. The left end of the connector plug 9 and the right end of the connector socket 10 are respectively connected to the two cables 8;

[0026] The rear connecting nut 3 and the front straight sleeve 7 are connected by threads. During use, the rear connecting nut 3 is pushed towards the front straight sleeve 7 and the threads are tightened. At this time, the O-ring one 4 is tightened at the limiting step 17, and at the same time forms a double seal between the front straight sleeve 7 and the rear straight sleeve 5 with the O-ring two 6. The front connecting nut 13 and the sensor housing 14 penetrating the top of the stack are connected by threads. After the threads are tightened, the front straight sleeve 7 presses against the O-ring three 12 on the sensor housing 14 to form a seal. At this time, a closed cavity is jointly formed between the rear straight sleeve 5 and the O-ring one 4, the front straight sleeve 7 and the O-ring two 6, and the sensor housing 14 and the O-ring three 12 to form a sealed protection for the internal cables 8, connector sockets 10, and connector plugs 9 to adapt to the harsh nuclear-level environment of high temperature, high pressure, and high humidity. The overall sealed protection is realized through the protection component, which can effectively reduce the requirements for the voltage resistance and moisture resistance of the connector socket 10, connector plug 9, and cable 8, and jointly form a closed cavity with the stainless steel bellows 1 to form a sealed protection for the internal signal transmission circuit.

[0027] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0028] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A protection component for the nuclear measurement cable of a nuclear power plant core, characterized in that, It includes a hexagonal mechanism (2). A rear-end connection nut (3) is provided at the right end of the hexagonal mechanism (2). The right end of the rear-end connection nut (3) is threadedly connected to the left end of a front-end straight sleeve (7). The right end of the front-end straight sleeve (7) is threadedly connected to the left end of a front-end connection nut (13). Sensor outer casings (14) are provided at the left end of the hexagonal mechanism (2) and the right end of the front-end connection nut (13). The two sensor outer casings (14) are respectively welded to the two stainless steel bellows (1). A connector plug (9) and a connector socket (10) are arranged inside the right side of the front-end straight sleeve (7). The right end of the connector plug (9) is connected to the left end of the connector socket (10). The left end of the connector plug (9) and the right end of the connector socket (10) are respectively connected to two cables (8). A limiting step (17) is provided on the inner wall of the right side of the rear-end connection nut (3). A snap ring (11) is provided inside the left side of the front-end connection nut (13). An O-ring one (4) is arranged in the limiting step (17), and an O-ring three (12) is arranged in the snap ring (11). A rear-end straight sleeve (5) is provided inside the left side of the front-end straight sleeve (7). A limiting inclined surface (15) is provided on the outer surface of the left side of the rear-end straight sleeve (5). An O-ring groove (16) is provided on the outer surface of the right side of the rear-end straight sleeve (5). An O-ring two (6) is arranged in the O-ring groove (16). The O-ring two (6) is used to form a seal with the inner wall of the front-end straight sleeve (7). The rear-end connection nut (3) is pushed towards the front-end straight sleeve (7) and the thread is tightened. The O-ring one (4) is tightened at the limiting step (17), and at the same time, a double seal is formed between the front-end straight sleeve (7) and the rear-end straight sleeve (5) together with the O-ring two (6).

2. The protection component of the nuclear measurement cable for the nuclear power plant core according to claim 1, characterized in that, The O-ring one (4) and the O-ring three (12) are used to form seals between the front-end straight sleeve (7) and the rear-end connection nut (3) and the front-end connection nut (13) respectively.

3. The protection component of the nuclear measurement cable for the nuclear power plant core according to claim 1, wherein The limiting inclined surface (15) is in contact with the O-ring one (4).

4. The protection component of the nuclear measurement cable for the nuclear power plant core according to claim 1, wherein The front-end connection nut (13) and the sensor outer casing (14) passing through the top of the pile are threadedly connected. After the thread is tightened, the front-end straight sleeve (7) presses against the O-ring three (12) on the sensor outer casing (14) to form a seal.

5. The protection component of the nuclear measurement cable for the nuclear power plant core according to claim 4, characterized in that, A closed cavity is jointly formed among the rear-end straight sleeve (5) and the O-ring one (4), the front-end straight sleeve (7) and the O-ring two (6), and the sensor outer casing (14) and the O-ring three (12).

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