Pneumatic control valve positioner for nuclear power plant

Abstract

The utility model discloses a nuclear power plant pneumatic control valve positioner which comprises a positioner body, a feedback mechanism and an electronic module, a feedback groove is formed in the positioner body, the feedback mechanism comprises a magnetic piece connected with a valve rod of a pneumatic control valve and a limiting piece installed on the feedback groove, and the electronic module is connected with the magnetic piece. The magnetic piece is installed in the limiting piece and can move back and forth in the extending direction of the feedback groove. According to the pneumatic control valve positioner for the nuclear power plant, the current position of the valve can be judged according to the size of a magnetic field received by the Hall element, a calculated valve position feedback signal participates in internal control of the positioner, and closed-loop control of the positioner is achieved. Meanwhile, through the arrangement of the limiting piece, it can be guaranteed that the magnetic piece does not make contact with the feedback groove when moving back and forth in the feedback groove, the risk of damaging the magnetic piece is avoided, the stability of the magnetic piece in the working process is improved, the service life of the magnetic piece is prolonged, and the magnetic piece is located more rapidly and accurately through the arrangement of the limiting piece.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic regulating valve positioner for a nuclear power plant. Background Art

[0002] The pneumatic control valve positioner is one of the important accessories and fittings of the pneumatic control valve, which plays the role of valve positioning. The pneumatic control valve positioner and the pneumatic actuator together constitute the automatic control unit and are connected with various control valves. After debugging and installation, they are combined into a pneumatic control valve.

[0003] The pneumatic control valve needs to realize its function in the system through the adjustment of the positioner installed on the valve. The adjustment of the positioner needs to be closed-loop controlled by receiving the valve position information given by the position feedback device. Therefore, the installation of the position feedback device is crucial to realize the function of the positioner. Once there is a deviation in the installation, the positioner will fail and the valve adjustment function will be lost. The current feedback device cannot meet the relevant use requirements. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pneumatic regulating valve positioner for a nuclear power plant.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a pneumatic regulating valve positioner for a nuclear power plant, which includes a positioner body, a feedback mechanism and an electronic module;

[0006] A feedback groove is provided on the positioner body, and the feedback mechanism includes a magnetic member connected to the valve stem of the pneumatic regulating valve and a limiter installed on the feedback groove, wherein the magnetic member is installed in the limiter and can move back and forth along the extension direction of the feedback groove;

[0007] The electronic module includes a Hall element, which is installed inside the positioner body and arranged corresponding to the feedback slot. When the magnetic part moves back and forth in the limit part, the nuclear power plant pneumatic control valve positioner determines the current valve position of the pneumatic control valve through the magnitude of the magnetic field received by the Hall element.

[0008] In some embodiments, the width of the feedback groove is 13 mm, and the width of the limiter is 12 mm.

[0009] In some embodiments, a limiting groove for installing the magnetic member is formed on the limiting member, and the width of the limiting groove is 7 mm.

[0010] In some embodiments, the width of the magnetic member is 6 mm.

[0011] In some embodiments, the pneumatic regulating valve positioner for a nuclear power plant further includes a positioning seat installed in the positioner body.

[0012] In some embodiments, the pneumatic regulating valve positioner for a nuclear power plant further includes a pneumatic amplifier installed on the positioning seat.

[0013] In some embodiments, the pneumatic regulating valve positioner for a nuclear power plant further includes an I / P converter mounted on the positioning seat.

[0014] In some embodiments, the pneumatic regulating valve positioner for a nuclear power plant further includes a pressure gauge installed on the positioning seat.

[0015] In some embodiments, the positioner body includes a first shell and a second shell covering each other.

[0016] In some embodiments, a junction box is connected to the first shell.

[0017] The implementation of the utility model has the following beneficial effects: the pneumatic regulating valve positioner of the nuclear power plant can judge the current position of the valve through the magnitude of the magnetic field received by the Hall element, and the calculated valve position feedback signal participates in the internal control of the positioner to realize the closed-loop control of the positioner itself. At the same time, through the setting of the limiter, it can be ensured that the magnetic part will not contact the feedback groove when the feedback groove moves back and forth, without the risk of damaging the magnetic part, and the stability and service life of the magnetic part during the working process are improved. The setting of the limiter makes the positioning of the magnetic part faster and more accurate. 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 It is a structural schematic diagram of a pneumatic regulating valve positioner for a nuclear power plant in some embodiments of the utility model;

[0020] Figure 2 It is a schematic diagram of the structure of the feedback mechanism in some embodiments of the utility model. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] See also Figure 1 and Figure 2 The utility model discloses a pneumatic control valve positioner for a nuclear power plant, which includes a positioner body 1, a feedback mechanism 2 and an electronic module. The positioner body 1 is provided with a feedback slot 11. The feedback mechanism 2 includes a magnetic member 21 connected to a valve stem of a pneumatic control valve and a stopper 22 installed on the feedback slot 11. The magnetic member 21 is installed in the stopper 22 and can move back and forth along the extension direction of the feedback slot 11. The electronic module includes a Hall element, which is installed inside the positioner body 1 and is arranged corresponding to the feedback slot 11. When the magnetic member 21 moves back and forth in the stopper 22, the pneumatic control valve positioner for a nuclear power plant determines the current valve position of the pneumatic control valve through the magnitude of the magnetic field received by the Hall element.

[0024] It can be understood that when the valve of the pneumatic control valve moves up and down, the valve stem is driven to move up and down. Since the magnetic component 21 is connected to the valve stem of the pneumatic control valve, the magnetic component 21 also moves back and forth along the extension direction of the feedback groove 11 with the movement of the valve stem. When the magnetic component 21 moves up and down, the magnetic field felt by the Hall element in the positioner body 1 is different. The positioner determines the current position of the valve through the size of the magnetic field received by the Hall element. The calculated valve position feedback signal participates in the internal control of the positioner to realize the closed-loop control of the positioner itself.

[0025] In addition, during the movement of the magnetic part 21, it is required that no part of the magnetic part 21 may contact the feedback slot 11, otherwise the magnetic part 21 will be worn and the closed-loop control function of the positioner cannot be realized. Therefore, in this embodiment, a limit member 22 is also provided on the feedback slot 11 for limiting and guiding the magnetic part 21. The limit member 22 is roughly U-shaped and is made of plastic material. It can cover the magnetic part 21 to ensure that the magnetic part 21 does not contact the feedback slot 11 when the feedback slot 11 moves back and forth, and there is no risk of damaging the magnetic part 21. The stability and service life of the magnetic part 21 during the working process are improved. The setting of the limit member 22 also makes the positioning of the magnetic part 21 faster and more accurate.

[0026] The width of the feedback slot 11 is 13 mm, and the width of the limiter 22 is 12 mm, so that the limiter 22 can be installed in the feedback slot 11. The limiter 22 is provided with a limiter slot 221 for the installation of the magnetic member 21. Since the installation requirements of the magnetic member 21 require that the gap between the outer wall of the magnetic member 21 and the inner wall of the feedback slot 11 should always be greater than 2 mm, the width of the limiter slot 221 is set to 7 mm, and the width of the magnetic member 21 is set to 6 mm. After the magnetic member 21 is installed in the center, the gap between the outer wall of the magnetic member 21 and the inner wall of the feedback slot 11 is 3.5 mm, which meets the installation requirements.

[0027] In some other embodiments, the above dimensions can be adjusted according to actual conditions as long as the installation requirements are met.

[0028] Furthermore, the pneumatic control valve positioner of the nuclear power plant also includes a positioning seat installed in the positioner body 1, a pneumatic amplifier installed on the positioning seat, an I / P converter and a pressure gauge. The pneumatic amplifier is used to receive the output pressure of the positioner and give the same pressure to the actuator, and output a large flow of gas source to the actuator to speed up the control valve operation speed. The I / P converter is also called an electrical converter, and its function is to convert the current or voltage signal into a linear proportional air pressure signal output. The pressure gauge is used to measure the output pressure of the positioner.

[0029] The positioner body 1 includes a first shell 12 and a second shell 13 that cover each other. A junction box 14 is connected to the first shell 12 .

[0030] 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 pneumatic control valve positioner for a nuclear power plant, characterized in that: It comprises a positioner body (1), a feedback mechanism (2) and an electronic module; A feedback groove (11) is provided on the positioner body (1), and the feedback mechanism (2) comprises a magnetic member (21) connected to a valve stem of a pneumatic regulating valve and a limit member (22) installed on the feedback groove (11), wherein the magnetic member (21) is installed in the limit member (22) and can move back and forth along the extension direction of the feedback groove (11); The electronic module comprises a Hall element, which is installed inside the positioner body (1) and arranged corresponding to the feedback slot (11). When the magnetic member (21) moves back and forth in the limit member (22), the pneumatic control valve positioner of the nuclear power plant determines the current valve position of the pneumatic control valve by the magnitude of the magnetic field received by the Hall element.

2. The pneumatic control valve positioner for a nuclear power plant according to claim 1, characterized in that: The width of the feedback groove (11) is 13 mm, and the width of the limiting member (22) is 12 mm.

3. The pneumatic regulating valve positioner for a nuclear power plant according to claim 1, characterized in that: The limiting member (22) is provided with a limiting groove (221) for installing the magnetic member (21), and the width of the limiting groove (221) is 7 mm.

4. The pneumatic regulating valve positioner for a nuclear power plant according to claim 1, characterized in that: The width of the magnetic piece (21) is 6 mm.

5. The pneumatic regulating valve positioner for a nuclear power plant according to claim 1, characterized in that: The pneumatic regulating valve positioner for a nuclear power plant further comprises a positioning seat installed in the positioner body (1).

6. The pneumatic regulating valve positioner for a nuclear power plant according to claim 5, characterized in that: The pneumatic regulating valve positioner of a nuclear power plant further comprises a pneumatic amplifier installed on the positioning seat.

7. The pneumatic regulating valve positioner for a nuclear power plant according to claim 5, characterized in that: The pneumatic regulating valve positioner for a nuclear power plant further comprises an I / P converter mounted on the positioning seat.

8. The pneumatic regulating valve positioner for a nuclear power plant according to claim 5, characterized in that: The pneumatic regulating valve positioner of a nuclear power plant further comprises a pressure gauge installed on the positioning seat.

9. The pneumatic regulating valve positioner for a nuclear power plant according to claim 1, characterized in that: The positioner body (1) comprises a first shell (12) and a second shell (13) which cover each other.

10. The pneumatic regulating valve positioner for a nuclear power plant according to claim 9, characterized in that: A junction box (14) is connected to the first shell (12).

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