Nuclear power plant valve device

Abstract

The utility model discloses a nuclear power plant valve device. The nuclear power plant valve device comprises a valve body assembly, a connecting assembly and a feedback device assembly. According to the nuclear power plant valve device, the feedback installation base is fixed to the valve base, the induction groove position on the position feedback device is matched with the magnetic strip, and the magnetic flux of the magnetic strip changes along with the position of the body. When the valve is opened / closed, the valve rod of the valve can move up and down, the magnetic strip moves along with the valve rod, and due to the fact that magnetic fluxes of all positions of the magnetic strip are different, information received by the position feedback device is different, the information is fed back to the DCS according to the actual situation, and the actual opening degree information of the valve can be obtained after processing. And through the arrangement of the connecting assembly, the installation problem of the magnetic strip is solved, and the installation position of the magnetic strip can be adjusted in time, so that the magnetic strip and the position feedback device can obtain a good position for matching.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve device for nuclear power plants. Background Technology

[0002] Currently, in CPR1000 series nuclear power plants, the main control operator can only see the command signals indicating the required opening degree of the ARE large and small valves, not the actual opening degree. In the event of a sudden valve failure, the valve opening degree can only be preliminarily judged based on information such as feedwater flow and valve limit. The actual valve opening degree can only be read on-site, increasing the difficulty for operators to diagnose and accurately intervene in unit transient faults. To compensate for these shortcomings, technicians plan to add an independent Fisher 4400 valve position measuring device to the local valve pneumatic actuator. This device will monitor the valve opening degree, with the DCS acquiring 4-20mA valve position signals corresponding to 0%-100% valve opening. The valve position will be displayed on the original system screen, allowing for a direct view of the actual valve opening degree. The Fisher 4400 valve position measuring device, used in conjunction with a magnetic strip, operates on a non-contact magnetic induction measurement principle. The magnetic strip needs to be installed on the valve stem, but there is no dedicated mounting location on the valve stem. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a valve device for nuclear power plants.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a valve device for a nuclear power plant, which includes a valve body assembly, a connection assembly, and a feedback assembly;

[0005] The valve body assembly includes a valve base and a valve stem that can move along the axial direction of the valve base.

[0006] The feedback assembly includes a feedback mounting base connected to the valve base and a position feedback device connected to the feedback mounting base, wherein the position feedback device is provided with a sensing slot;

[0007] The connecting assembly includes a connecting base connected to the valve stem, an intermediate connecting piece connected to the connecting base, a magnetic strip mounting plate connected to the intermediate connecting piece, and a magnetic strip connected to the magnetic strip mounting plate.

[0008] As the magnetic strip moves back and forth with the valve stem, the sensing slot senses the positional change of the magnetic strip to detect the movement distance of the valve stem.

[0009] In some embodiments, the connecting base is provided with a plurality of positioning connecting holes, and the intermediate connecting member includes a first intermediate connecting part and a second intermediate connecting part arranged vertically. The first intermediate connecting part is provided with a plurality of intermediate connecting adjustment holes corresponding to the positioning connecting holes.

[0010] In some embodiments, the second intermediate connecting portion is provided with a plurality of intermediate positioning connecting holes, and the magnetic strip mounting plate is provided with a plurality of magnetic strip mounting adjustment holes corresponding to the intermediate positioning connecting holes.

[0011] In some embodiments, both the positioning connection hole and the intermediate positioning connection hole are threaded holes.

[0012] In some embodiments, the magnetic strip mounting plate has magnetic strip positioning holes for mounting the magnetic strip.

[0013] In some embodiments, the connecting base has a valve stem mounting adjustment hole corresponding to the valve stem.

[0014] In some embodiments, the nuclear power plant valve device further includes a limit assembly, which includes a limit mounting bracket, an upper limit switch, a lower limit switch, and a limit sensor.

[0015] The limit mounting bracket is connected to the valve base. The upper limit switch and the lower limit switch are separately mounted on the limit mounting bracket. The limit sensor is mounted on the connecting base and can move back and forth between the upper limit switch and the lower limit switch.

[0016] In some embodiments, the limit mounting bracket is provided with limit switch mounting adjustment holes for mounting the upper limit switch and the lower limit switch.

[0017] In some embodiments, the connecting base is provided with a limiting positioning hole for mounting the limiting sensor.

[0018] In some embodiments, a groove is provided in the middle of the connecting base, the valve stem mounting adjustment hole is provided in the groove, and the positioning connecting hole and the limiting positioning hole are located on opposite sides of the groove.

[0019] The present invention offers the following advantages: This nuclear power plant valve device fixes the feedback mounting base to the valve base. The position feedback device uses a sensing slot on the sensor in conjunction with a magnetic strip, whose magnetic flux changes with the valve body's position. When the valve opens or closes, the valve stem moves up or down, and the magnetic strip moves accordingly. Because the magnetic flux varies at different positions of the magnetic strip, the position feedback device receives different information, which is then fed back to the DCS (Distributed Control System) based on the actual situation. After processing, the actual valve opening information is obtained. Furthermore, the installation problem of the magnetic strip is solved by setting up a connecting component, and the installation position of the magnetic strip can be adjusted in real time, ensuring optimal positioning and coordination between the magnetic strip and the position feedback device. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the present 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 some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of a nuclear power plant valve device in some embodiments of this utility model;

[0022] Figure 2 This is an exploded view of the components of a nuclear power plant valve device in some embodiments of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the connecting base in some embodiments of this utility model;

[0024] Figure 4 This is a structural schematic diagram of the intermediate connecting member in some embodiments of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the magnetic strip mounting plate in some embodiments of this utility model. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0027] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0028] Please see Figures 1 to 5 This utility model discloses a valve device for a nuclear power plant, which includes a main component, a connecting component 2, and a feedback component 3. The main component includes a valve base 11 and a valve stem 12 that can move along the axial direction of the valve base 11; the feedback component 3 includes a feedback mounting base 31 connected to the valve base 11 and a position feedback device 32 connected to the feedback mounting base 31, the position feedback device 32 being provided with a sensing slot; the connecting component 2 includes a connecting base 21 connected to the valve stem 12, an intermediate connecting member 22 connected to the connecting base 21, a magnetic strip mounting plate 23 connected to the intermediate connecting member 22, and a magnetic strip 24 connected to the magnetic strip mounting plate 23; when the magnetic strip 24 moves back and forth with the valve stem 12, the sensing slot senses the position change of the magnetic strip 24 to detect the moving distance of the valve stem 12.

[0029] Understandably, the valve unit in this nuclear power plant fixes the feedback mounting base 31 to the valve base 11, and the sensing slot on the position feedback device 32 engages with the magnetic strip 24. The magnetic flux of the magnetic strip 24 changes with the position of the valve body. When the valve performs an opening / closing action, the valve stem 12 moves up / down, and the magnetic strip 24 moves accordingly. Because the magnetic flux of the magnetic strip 24 varies at different positions, the position feedback device 32 receives different information, which is then fed back to the DCS based on the actual situation. After processing, the actual valve opening information can be obtained. By setting up the connecting component 2, the installation problem of the magnetic strip 24 is solved, and the installation position of the magnetic strip 24 can be adjusted in time, allowing the magnetic strip 24 and the position feedback device 32 to achieve good positioning coordination. Here, the DCS is the control system.

[0030] like Figure 3 and Figure 4 As shown, the connecting base 21 has multiple positioning connection holes 211. The intermediate connecting member 22 includes a vertically arranged first intermediate connecting part 221 and a second intermediate connecting part 222. The first intermediate connecting part 221 has multiple intermediate connecting adjustment holes 2211 corresponding to the positioning connection holes 211. The intermediate connecting member 22 is an L-shaped component, which can be connected to the connecting base 21 by bolts. The intermediate connecting adjustment holes 2211 facilitate the installation of the intermediate connecting member 22. The second intermediate connecting part 222 has multiple intermediate positioning connection holes 2221, and the magnetic strip mounting plate 23 has multiple magnetic strip mounting adjustment holes 231 corresponding to the intermediate positioning connection holes 2221. The magnetic strip mounting plate 23 can also be connected to the intermediate connecting member 22 by bolts. Both the positioning connection holes 211 and the intermediate positioning connection holes 2221 are threaded holes.

[0031] The connecting base 21 has a valve stem mounting adjustment hole 212 corresponding to the valve stem 12. The valve stem mounting adjustment hole 212 is vertically arranged, and it can be connected to the coupling on the valve stem 12 by screws through the valve stem mounting adjustment hole 212.

[0032] The magnetic strip mounting plate 23 has magnetic strip positioning holes 232 for mounting the magnetic strip 24. The magnetic strip 24 can be installed on the magnetic strip mounting plate 23 with bolts. More specifically, the magnetic strip mounting plate 23 is T-shaped to fit the shape of the magnetic strip 24. The magnetic strip positioning holes 232 are arranged vertically and can be flexibly adjusted when installing the magnetic strip 24.

[0033] like Figure 1 and Figure 2 As shown, the nuclear power plant unit also includes a limit assembly 4, which includes a limit mounting bracket 41, an upper limit switch 42, a lower limit switch 43, and a limit sensor 44. The limit mounting bracket 41 is connected to the valve base 11. The upper limit switch 42 and the lower limit switch 43 are separately mounted on the limit mounting bracket 41. The limit sensor 44 is mounted on the connecting base 21 and can move back and forth between the upper limit switch 42 and the lower limit switch 43. The limit sensor 44 can be a round rod. Specifically, the valve stem 12 moves up and down as the valve opens or closes, and the limit sensor 44 moves accordingly. When the valve is fully open, the limit sensor 44 contacts the upper limit switch 42, thereby triggering a fully open signal and realizing information feedback. When the valve is closed, the valve stem 12 moves downward, and the limit sensor 44 moves accordingly. When the valve is fully closed, the limit sensor 44 contacts the lower limit switch 43, thereby triggering a fully open signal and realizing information feedback.

[0034] The limit mounting bracket 41 has a limit switch mounting adjustment hole 411 for mounting the upper limit switch 42 and the lower limit switch 43, and the connecting base 21 has a limit positioning hole 213 for mounting the limit sensing element 44.

[0035] A groove 214 is provided in the middle of the connecting base 21, and the valve stem mounting adjustment hole 212 is provided in the groove 214. The positioning connection hole 211 and the limiting positioning hole 213 are located on both sides of the groove 214. The function of the groove 214 is to ensure that the bolt can be lower than the plane on both sides when the connecting base 21 is installed, thereby ensuring that there is no interference when the intermediate connecting part 22 is installed.

[0036] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A valve device for a nuclear power plant, characterized in that, It includes a valve body assembly (1), a connection assembly (2), and a feedback assembly (3); The valve body assembly (1) includes a valve base (11) and a valve stem (12) that can move along the axial direction of the valve base (11). The feedback assembly (3) includes a feedback mounting base (31) connected to the valve base (11) and a position feedback device (32) connected to the feedback mounting base (31), wherein the position feedback device (32) is provided with a sensing slot; The connecting assembly (2) includes a connecting base (21) connected to the valve stem (12), an intermediate connector (22) connected to the connecting base (21), a magnetic strip mounting plate (23) connected to the intermediate connector (22), and a magnetic strip (24) connected to the magnetic strip mounting plate (23). When the magnetic strip (24) moves back and forth with the valve stem (12), the sensing slot senses the position change of the magnetic strip (24) to detect the moving distance of the valve stem (12).

2. The nuclear power plant valve device according to claim 1, characterized in that, The connecting base (21) has a plurality of positioning connecting holes (211), and the intermediate connecting member (22) includes a first intermediate connecting part (221) and a second intermediate connecting part (222) arranged vertically. The first intermediate connecting part (221) has a plurality of intermediate connecting adjustment holes (2211) corresponding to the positioning connecting holes (211).

3. The nuclear power plant valve device according to claim 2, characterized in that, The second intermediate connecting part (222) has a plurality of intermediate positioning connecting holes (2221), and the magnetic strip mounting plate (23) has a plurality of magnetic strip mounting adjustment holes (231) corresponding to the intermediate positioning connecting holes (2221).

4. The nuclear power plant valve device according to claim 3, characterized in that, Both the positioning connection hole (211) and the intermediate positioning connection hole (2221) are threaded holes.

5. The nuclear power plant valve device according to claim 1, characterized in that, The magnetic strip mounting plate (23) is provided with a magnetic strip positioning hole (232) for mounting the magnetic strip (24).

6. The nuclear power plant valve device according to claim 2, characterized in that, The connecting base (21) is provided with a valve stem mounting adjustment hole (212) corresponding to the valve stem (12).

7. The nuclear power plant valve device according to claim 6, characterized in that, The nuclear power plant valve device also includes a limit assembly (4), which includes a limit mounting bracket (41), an upper limit switch (42), a lower limit switch (43), and a limit sensor (44). The limit mounting bracket (41) is connected to the valve base (11). The upper limit switch (42) and the lower limit switch (43) are separately mounted on the limit mounting bracket (41). The limit sensor (44) is mounted on the connecting base (21). The limit sensor (44) can move back and forth between the upper limit switch (42) and the lower limit switch (43).

8. The nuclear power plant valve device according to claim 7, characterized in that, The limit mounting bracket (41) is provided with a limit switch mounting adjustment hole (411) for mounting the upper limit switch (42) and the lower limit switch (43).

9. The nuclear power plant valve device according to claim 7, characterized in that, The connecting base (21) has a limiting positioning hole (213) for the installation of the limiting sensor (44).

10. The nuclear power plant valve device according to claim 9, characterized in that, The connecting base (21) has a groove (214) in the middle position, the valve stem mounting adjustment hole (212) is located on the groove (214), and the positioning connecting hole (211) and the limiting positioning hole (213) are located on both sides of the groove (214).

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