Electrical converter for nuclear power

Abstract

The utility model provides an electrical converter for nuclear power, which comprises a shell, a filter, an amplifier assembly and a torque motor assembly, the shell comprises a cover and a casing, the cover and the casing are connected through threads, and a sealing element is installed at the connection; the filter, the amplifier assembly and the torque motor assembly are located inside the casing. The utility model also comprises an air path, the inlet of the air path is an air inlet, the outlet is an air outlet, and the gas from an external gas source enters the air inlet, sequentially passes through the filter, the inside of the amplifier assembly and the inside of the torque motor assembly, completes signal conversion, returns to the amplifier assembly again and is finally discharged from the air outlet. The utility model can adapt to the harsh working conditions of nuclear power, is resistant to radiation, resistant to earthquakes and has good protection performance.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to an electrical converter for nuclear power plants. Background Technology

[0002] In recent years, with the development and construction of third-generation nuclear power technology, my country has placed correspondingly higher demands on nuclear safety in nuclear power instrumentation and control. Nuclear-grade pneumatic control valves, as the actuators of loop control, are commonly used and indispensable for the normal, efficient, and safe operation of the overall process flow of a nuclear power plant. They play a crucial role in the construction and operation of nuclear power plants. Electrical converters are important accessories for pneumatic control valves, responsible for converting the input control signals. They play a decisive role in the efficient and safe operation of the entire control valve system and are an indispensable part of the "nervous system" of the pneumatic control valve.

[0003] To improve the control quality of control valves, major foreign valve manufacturers, leveraging their advantages in control valve control units, have developed dedicated electrical converters for the nuclear safety field, which are separately installed and assembled on-site. However, they do not disclose information about these converters. Currently, due to cost and technological barriers, China has not yet developed an independent electrical converter suitable for nuclear power plant conditions. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical converter for nuclear power plants that can adapt to the harsh operating conditions of nuclear power plants, is radiation resistant, earthquake resistant, and has good protective performance.

[0005] The technical solution of the present invention is as follows: an electrical converter for nuclear power plants includes a housing, a filter element, an amplifier assembly, and a torque motor assembly. The housing includes a cover and a shell, which are connected by threads, and a seal is installed at the connection. The filter element, the amplifier assembly, and the torque motor assembly are located inside the shell.

[0006] The housing has a torque motor assembly mounting boss inside, an amplifier assembly mounting boss at the bottom, and a cable connector mounting boss, an outer grounding boss, an air inlet connector mounting boss, and an air outlet connector mounting boss arranged sequentially on the sides. The torque motor assembly is fixedly mounted on the torque motor assembly mounting boss, the amplifier assembly is fixedly mounted on the amplifier assembly mounting boss, the cable connector is connected to the cable connector mounting boss, the air inlet connector is connected to the air inlet connector mounting boss, the air outlet connector is connected to the air outlet connector mounting boss, and the outer grounding boss is used for equipment grounding.

[0007] It also includes an air path, with an inlet connector and an outlet connector. External air enters through the inlet connector, passes through the filter, the inside of the amplifier assembly, and the inside of the torque motor assembly in sequence, completes signal conversion, returns to the amplifier assembly, and is finally discharged from the outlet connector.

[0008] The mounting bosses for the torque motor assembly and the amplifier assembly are integrally cast with the housing.

[0009] The bottom of the housing is integrated with a bracket mounting boss, and the bracket is connected to the bracket mounting boss by threads.

[0010] The torque motor assembly includes a pressure plate and a base, which are fixed together by torque motor fasteners. A frame, magnets, and pole shoes are assembled between the pressure plate and the base. The torque motor assembly is fixed to the torque motor assembly mounting boss by the base and torque motor fasteners. The torque motor spring is mounted on the amplifier assembly spring seat of the amplifier assembly. The amplifier assembly spring seat cooperates with the adjusting screw to realize torque and displacement adjustment. The limiting component is sleeved on the outside of the adjusting screw and limits its stroke. Washers and retaining rings are sleeved on the adjusting screw. The torque motor spring seat is installed inside the base to support and position the torque motor spring. The torque motor assembly also includes an adjusting component, a nozzle, a terminal block, and a bellows; the terminal block is fixed to the side wall of the base; the bellows is installed at the air passage interface of the torque motor assembly; one end of the nozzle is connected to the air passage of the torque motor assembly, and the other end is connected to the air passage of the amplifier assembly; the adjusting component is assembled on the top of the torque motor assembly and is connected to the internal adjusting screw, and the output characteristics of the equipment can be finely adjusted by rotating the adjusting component.

[0011] The amplifier assembly includes a valve body, a cover, and an intermediate block sandwiched between the cover and the valve body. The three are locked together by amplifier assembly fasteners to form a sealed air passage chamber. The amplifier assembly is fixed to the amplifier assembly mounting boss by the cover and fasteners. The valve core is assembled inside the valve body, and the amplifier assembly spring is supported by the amplifier assembly spring seat to provide the valve core with a reset force. The corrugated diaphragm is embedded in the side wall of the valve body for pressure signal feedback and to drive the valve core to move.

[0012] The amplifier assembly includes an air passage, with the valve body located on the air passage. The hard core assembly is embedded within the valve body air passage; a transverse throttling orifice is opened on the valve body air passage; and a muffler is mounted at the air passage outlet.

[0013] After being purified by the filter, the external gas enters the air passage of the valve body, passes through the horizontal throttle orifice and the hard core assembly in sequence, and then enters the air passage of the torque motor assembly through the nozzle. After the gas completes the signal conversion, it returns to the exhaust port of the valve body and is finally discharged from the outlet joint through the silencer.

[0014] The torque motor assembly is sealed internally by a torque motor seal, while the amplifier seal provides a seal for the amplifier assembly.

[0015] The significant advantages of this invention are: the protective performance of the housing is ensured by the threaded connections between the casing and the housing, and between the housing and the cable connector, as well as the sealing elements installed between each mating surface; the integrated structure of various mounting bosses on the housing improves the seismic resistance of the housing; the torque motor assembly and amplifier assembly are modular structures, which further enhance their seismic resistance. This nuclear power electrical converter has a compact and space-saving structure, while also possessing excellent seismic resistance and protection, meeting the harsh operating conditions of nuclear power applications. Attached Figure Description

[0016] Figure 1 is a schematic diagram of a highly reliable network security communication system suitable for nuclear industrial control systems.

[0017] The markings in the diagram and their corresponding component names are as follows: in: Figure 1a b is a cross-sectional view of an electrical converter used in nuclear power plants; Figure 2a This is a top view of the casing of an electrical converter used in nuclear power plants; Figure 2b Bottom view of the housing of an electrical converter for nuclear power plants; Figure 3a Diagram of a torque motor assembly for an electrical converter used in nuclear power plants; Figure 3b Diagram of a torque motor assembly for an electrical converter used in nuclear power plants; Figure 4 This is a diagram of the amplifier assembly for an electrical converter used in nuclear power plants; Wherein, 1—outer shell; 2—filter element; 3—amplifier assembly; 4—torque motor assembly; 5—fastener; 6—sealant; 7—cover; 8—housing; 9—thread. 11—Torque motor assembly mounting boss; 12—Amplifier assembly mounting boss; 13—Cable connector mounting boss; 14—External grounding boss; 15—Inlet connector mounting boss; 16—Outlet connector mounting boss; 17—Bracket mounting boss. 18—Adjusting component; 19—Nozzle; 20—Terminal connector; 21—Bellbell; 22—Base; 23—Torque motor spring seat; 24—Frame; 25—Pressure plate; 26—Limiting component; 27—Adjusting screw; 28—Magnet; 29—Pole shoe; 30—Torque motor spring; 31—Washer; 32—Retaining ring; 33—Torque motor fastener; 34—Torque motor seal; 35—Valve body; 36—Intermediate block; 37—Cover; 38—Hard core assembly; 39—Amplifier assembly spring; 40—Valve core; 41—Amplifier assembly spring seat; 42—Bellbell diaphragm; 43—Silencer; 44—Transverse throttling orifice; 45—Amplifier seal; 46—Amplifier assembly fastener. Detailed Implementation

[0018] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0019] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first.

[0021] The specific technical content of the present invention will now be described with reference to the accompanying drawings; Referring to Figures 1-4, an electrical converter for nuclear power includes: a housing 1, a filter element 2, an amplifier assembly 3, a torque motor assembly 4, a fastener 5, and a seal 6.

[0022] The outer shell 1 includes a cover 7 and a housing 8, which are connected by threads 9. The edges of the mating surfaces are widened, and a seal 6 is installed between the mating surfaces to improve the overall protection level.

[0023] As shown in Figures 2a and 2b, the inner cavity of the housing 8 is provided with a torque motor assembly mounting boss 11, and the torque motor assembly 4 is fixedly mounted on the torque motor assembly mounting boss 11 by fasteners; the bottom of the housing 8 is provided with an amplifier assembly mounting boss 12, and the amplifier assembly 3 is fixedly mounted on the amplifier assembly mounting boss 12 by fasteners. The torque motor assembly mounting boss 11, the amplifier assembly mounting boss 12 and the housing 8 are integrally cast structures, which greatly improves the overall seismic performance.

[0024] The casing 8 has an integrated cable connector mounting boss 13, an outer grounding boss 14, an air inlet connector mounting boss 15, and an air outlet connector mounting boss 16 on its side, all with internal threaded holes. The cable connector is threaded to the cable connector mounting boss 13, the air inlet connector is threaded to the air inlet connector mounting boss 15, and the air outlet connector is threaded to the air outlet connector mounting boss 16. The outer grounding boss 14 is used for equipment grounding to ensure electrical safety in nuclear power conditions. The bottom of the casing 8 has an integrated bracket mounting boss 17, and the bracket is threaded to the bracket mounting boss 17 for overall fixed installation.

[0025] This application includes a gas path structure. The gas path inlet is the inlet connector mounting boss 15, and the outlet is the outlet connector mounting boss 16. External gas enters from the inlet connector mounting boss 15, passes through the filter 2, the inside of the amplifier assembly 3, and the inside of the torque motor assembly 4 in sequence, completes signal conversion, returns to the amplifier assembly 3, and is finally discharged from the outlet connector.

[0026] like Figure 3a As shown in Figures 1 and 2, the torque motor assembly 4 includes: an adjusting element 18, a nozzle 19, a terminal block 20, a bellows 21, a base 22, a spring seat 23, a frame 24, a pressure plate 25, a limiting element 26, an adjusting screw 27, a magnet 28, a pole shoe 29, a spring 30, a washer 31, a retaining ring 32, a fastener 33, and a torque motor seal 34.

[0027] The pressure plate 25 and the base 22 are locked and fixed by the torque motor fastener 33 to form the main mounting frame; The frame 24, magnet 28, and pole shoe 29 are assembled between the pressure plate 25 and the base 22 to form an electromagnetic drive unit; The torque motor spring seat 23 is installed inside the base 22, below the torque motor spring 30; its function is to support the torque motor spring 30, limit the installation position and range of motion of the spring, ensure that the spring is subjected to uniform force, and improve the structural stability.

[0028] The torque motor spring 30 is mounted on the amplifier assembly spring seat 41 of the amplifier assembly 3. The amplifier assembly spring seat 41 cooperates with the adjusting screw 27 to realize torque and displacement adjustment. The limiting member 26 limits the stroke of the adjusting screw 27. The washer 31 and the retaining ring 32 are fitted on the adjusting screw 27 for axial positioning and anti-loosening. The terminal block 20 is fixed to the side of the base 22 for external electrical connection; the bellows 21 is integrated into the air interface of the torque motor assembly 4 to achieve pressure compensation and sealing; the nozzle 19 connects to the internal air path of the amplifier assembly 3 to complete the gas flow control. Adjustment component 18 is mounted on the top of torque motor assembly 4 and is linked with adjustment screw 27 for fine adjustment of output characteristics; torque motor seal 34 is arranged at each assembly gap of torque motor assembly 4 to achieve double sealing of air passage and circuit inside the assembly. The entire torque motor assembly 4 is fixed to the torque motor assembly mounting boss 11 of the housing 8 via the base 22 and torque motor fastener 33. The torque motor spring seat 23 is fixed in the internal cavity of the base 22 to support and position the torque motor spring 30, limit the spring's extension and contraction stroke, and improve the stability of the component's operation. By replacing the torque motor assembly 4 with different specifications, it can be adapted to different input signal ranges.

[0029] like Figure 4 As shown, amplifier assembly 3 includes: valve body 35, intermediate block 36, cover 37, hard core assembly 38, spring 39, valve core 40, spring seat 41, corrugated diaphragm 42, silencer 43, transverse throttling orifice 44, seal 45, and fastener 46.

[0030] The intermediate block 36 is clamped between the cover 37 and the valve body 35, and the three are locked together by the amplifier assembly fastener 46 to form a sealed gas passage chamber; The corrugated diaphragm 42 is installed in the mounting groove on the side wall of the valve body 35, between the external space of the valve body 35 and the internal sealed air passage chamber, and is arranged to fit the side wall of the air passage as a whole; the corrugated diaphragm 42 feeds back the pressure signal and drives the valve core 40 to move, thereby realizing the dynamic adjustment of the air passage pressure.

[0031] The valve core 40 is assembled inside the valve body 35, and the amplifier assembly spring 39 is supported on the amplifier assembly spring seat 41 to provide a reset force for the valve core 40. The hard core component 38 is embedded inside the main air passage of the valve body 35 to ensure the accuracy of air flow; the transverse throttling orifice 44 is opened on the side wall of the air passage of the valve body 35 and connected in series in the main air passage to realize air throttling and pressure stabilization; the filter element 2 is installed at the front end of the air inlet to filter and purify the compressed air entering the whole machine. The silencer 43 is threadedly connected to the exhaust port of the valve body 35 to reduce exhaust noise; the amplifier seal 45 is arranged at the joint surface of the valve body 35, the intermediate block 36, and the cover 37 to ensure the airtightness of each joint surface. In amplifier assembly 3, the gas path flow is as follows: after being purified by filter element 2, the gas enters the main gas path channel of valve body 35, and then passes through horizontal throttling orifice 44 to achieve throttling and pressure stabilization. After flowing through hard core assembly 38, it flows to nozzle 19 and enters torque motor assembly 4. At the same time, corrugated diaphragm 42 senses the gas path pressure, drives valve core 40 to act, adjusts the gas path flow, and realizes signal conversion.

[0032] Seal 6 is the outer casing seal of the whole machine, torque motor seal 34 is the internal seal of torque motor assembly 4, and amplifier seal 45 is the internal seal of amplifier assembly 3. The three types of seals are arranged in separate areas to jointly ensure the sealing protection level of the whole machine.

[0033] The entire amplifier assembly 3 is secured to the amplifier assembly mounting boss 12 of the housing 8 by the cover 37 and the torque motor fastener 33.

[0034] The torque motor assembly 4 and the amplifier assembly 3 adopt an independent modular design, which can be disassembled, replaced and maintained separately. Together with the integrated boss structure of the shell, they meet the requirements of radiation resistance, earthquake resistance and high protection in nuclear power conditions.

[0035] The aforementioned nuclear power electrical converter ensures the protective performance of the housing 8 through threaded connections between the casing 7 and the housing 8, and between the housing 8 and the cable connector, as well as the installation of seals 6 between the mating surfaces. Various mounting bosses 1 on the housing 8 are integrated with the housing 8, effectively improving the overall seismic resistance of the housing 8. The torque motor assembly 2 and amplifier assembly 3 adopt a modular design, which significantly improves their seismic resistance. This nuclear power electrical converter features a compact structure, saves installation space, and possesses excellent seismic and protective performance, making it fully adaptable to the harsh operating conditions required in nuclear power applications.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0037] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0038] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0039] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application.

Claims

1. An electrical converter for nuclear power plants, characterized in that: It includes a housing (1), a filter (2), an amplifier assembly (3), and a torque motor assembly (4). The housing (1) includes a cover (7) and a housing (8), which are connected by threads (9) and a seal (6) is installed at the connection. The filter (2), amplifier assembly (3), and torque motor assembly (4) are located inside the housing (8).

2. The electrical converter for nuclear power plants according to claim 1, characterized in that: The housing (8) has a torque motor assembly mounting boss (11) inside, an amplifier assembly mounting boss (12) at the bottom, and a cable connector mounting boss (13), an outer grounding boss (14), an air inlet mounting boss (15), and an air outlet mounting boss (16) arranged sequentially on the side. The torque motor assembly (4) is fixedly mounted on the torque motor assembly mounting boss (11), the amplifier assembly (3) is fixedly mounted on the amplifier assembly mounting boss (12), the cable connector is connected to the cable connector mounting boss (13), the air inlet is connected to the air inlet mounting boss (15), the air outlet is connected to the air outlet mounting boss (16), and the outer grounding boss (14) is used for equipment grounding.

3. The electrical converter for nuclear power plants according to claim 2, characterized in that: It also includes an air path, with an air inlet and an air outlet. External air enters through the air inlet, passes through the filter (2), the inside of the amplifier assembly (3), and the inside of the torque motor assembly (4) in sequence, completes signal conversion, returns to the amplifier assembly (3), and is finally discharged from the air outlet.

4. The electrical converter for nuclear power plants according to claim 2, characterized in that: The torque motor assembly mounting boss (11), the amplifier assembly mounting boss (12), and the housing (8) are integrally cast structures.

5. A nuclear power plant electrical converter according to claim 2, characterized in that: The bottom of the housing (8) is integrally provided with a bracket mounting boss (17), and the bracket is connected to the bracket mounting boss (17) by threads.

6. The electrical converter for nuclear power plants according to claim 3, characterized in that: The torque motor assembly (4) includes a pressure plate (25) and a base (22). The pressure plate (25) and the base (22) are fixed by torque motor fasteners (33). The frame (24), magnet (28), and pole shoe (29) are assembled between the pressure plate (25) and the base (22). The torque motor assembly (4) is fixed on the torque motor assembly mounting boss (11) by the base (22) and the torque motor fasteners (33). The torque motor spring (30) is installed on the amplifier assembly spring seat (41) of the amplifier assembly (3). The amplifier assembly spring seat (41) cooperates with the adjusting screw (27) to realize torque and displacement adjustment. The limiting member (26) is sleeved on the outside of the adjusting screw (27) and limits its stroke. The washer (31) and the retaining ring (32) are sleeved on the adjusting screw (27). The torque motor spring seat (23) is installed inside the base (22) to support and position the torque motor spring (30). The torque motor assembly (4) also includes an adjusting component (18), a nozzle (19), a terminal block (20), and a bellows (21); the terminal block (20) is fixed to the side wall of the base (22); the bellows (21) is installed at the air passage interface of the torque motor assembly (4); one end of the nozzle (19) is connected to the air passage of the torque motor assembly (4), and the other end is connected to the air passage of the amplifier assembly (3); the adjusting component (18) is assembled on the top of the torque motor assembly (4) and is connected to the internal adjusting screw (27) for transmission.

7. A nuclear power plant electrical converter according to claim 6, characterized in that: The amplifier assembly (3) includes a valve body (35), a cover (37), and an intermediate block (36) sandwiched between the cover (37) and the valve body (35). The three are locked together by the amplifier assembly fastener (46) to form a sealed air passage chamber. The amplifier assembly (3) is fixed on the amplifier assembly mounting boss (12) by the cover (37) and the fastener. The valve core (40) is assembled inside the valve body (35), and the amplifier assembly spring (39) is supported on the amplifier assembly spring seat (41) to provide a reset force for the valve core (40). The corrugated diaphragm (42) is embedded in the side wall of the valve body (35) for pressure signal feedback and to drive the valve core (40) to move.

8. A nuclear power plant electrical converter according to claim 7, characterized in that: The amplifier assembly (3) includes an air passage, and the valve body (35) is located on the air passage. The hard core assembly (38) is embedded in the air passage of the valve body (35). A transverse throttle orifice (44) is opened on the air passage of the valve body (35). A silencer (43) is installed at the outlet of the air passage.

9. A nuclear power plant electrical converter according to claim 8, characterized in that: After being purified by the filter (2), the external gas enters the gas path of the valve body (35), passes through the horizontal throttle hole (44) and the hard core assembly (38) in sequence, and then enters the gas path of the torque motor assembly (4) through the nozzle (19). After the gas completes the signal conversion, it returns to the exhaust port of the valve body (35) and is finally discharged from the exhaust connector through the muffler (43).

10. A nuclear power plant electrical converter according to claim 8, characterized in that: The torque motor assembly (4) is sealed internally by a torque motor seal (34), while the amplifier seal (45) seals the amplifier assembly (3).

Images