Reactor control rod stroke measuring device and method

Abstract

The invention relates to the technical field of nuclear reactor control, in particular to a reactor control rod stroke measuring device and method. The measuring device comprises a stroke linkage mechanism which is matched with a speed reducing mechanism and can be in transmission connection with a control rod driving and lifting mechanism; the position indicator is in transmission connection with the stroke linkage mechanism, the position indicator can reflect the movement stroke of the stroke linkage mechanism, and in the working state, the stroke linkage mechanism is driven by the control rod driving and lifting mechanism to synchronously act, so that the stroke of the control rod is mapped to the position indicator; the motion stroke of the stroke linkage mechanism is measured through the position indicator, so that the stroke of the control rod in the nuclear reactor is obtained, the operation safety of the reactor is effectively guaranteed, the stroke of the stroke linkage mechanism can be shortened, the size of the stroke linkage mechanism can be reduced, and the height of the control rod in a reactor core can be visually reflected. The measuring method is based on the measuring device.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor control technology, and specifically to a reactor control rod stroke measurement device and method. Background Technology

[0002] The purpose of reactor control is to control the chain reaction of nuclear fission in a nuclear reactor, ensure the efficient use of core energy, and guarantee safe reactor operation. To control the chain reaction of nuclear fission within the reactor, control rods are typically used to regulate reactivity. Therefore, measuring the travel and velocity of the control rods is crucial for reactor safety.

[0003] The control rods within the reactor are controlled by a control lifting mechanism. This mechanism positions the control rod assemblies vertically, altering or maintaining their vertical height within the core to enable reactor start-up and shutdown. During normal operation, it regulates or maintains the core's power level and, in the event of an accident, rapidly lowers the rods to shut down the reactor. Accurate control of the control rods requires monitoring their travel. Summary of the Invention

[0004] To address the need for rod position measurement during reactor control rod control, this invention provides a reactor control rod stroke measurement device and method, which can accurately measure the height of the control rod in the reactor core, effectively ensuring reactor operation safety.

[0005] This invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides a reactor control rod stroke measuring device, comprising: a stroke linkage mechanism adapted to a reduction mechanism, and the stroke linkage mechanism being tractably connected to a control rod lifting mechanism; and a position indicator tractably connected to the stroke linkage mechanism, and the position indicator being tractably connected to the stroke linkage mechanism.

[0007] It should be noted that the control rods of a nuclear reactor, through a control rod lifting mechanism, change or maintain the vertical height of the control rod assembly within the reactor core, thereby enabling reactor start-up and shutdown. During normal reactor operation, they also regulate or maintain the core's power level and, in the event of an accident, rapidly lower the rods to shut down the reactor. Therefore, the stroke of the control rods is determined based on the height of the active region of the reactor core (two sets matched), typically 3–4 meters, to ensure that the control rods can effectively control the neutron flux throughout the entire core height. If the position of the control rods were directly indicated by a scale of the same length as the control rods, the measuring scale would be too long, making it difficult to intuitively measure and indicate the height of the control rods within the core. Furthermore, the scale would need to be located outside the core, and a long scale would affect the layout of other reactor components, hindering efforts to reduce the reactor's overall size.

[0008] In view of this, the reactor control rod stroke measuring device provided by the present invention includes a stroke linkage mechanism and a position indicator. In use, the stroke linkage mechanism is driven to the control rod lifting mechanism so that the stroke linkage mechanism moves synchronously under the drive of the control rod lifting mechanism. The position indicator is driven to the stroke linkage mechanism and can reflect the movement stroke of the stroke linkage mechanism. Thus, the stroke of the control rod is mapped to the position indicator so that the movement stroke of the stroke linkage mechanism can be measured through the position indicator, thereby obtaining the stroke of the control rod in the nuclear reactor.

[0009] When the control rod lifting mechanism drives the control rod to move, the stroke linkage mechanism operates at a set speed. Since the stroke linkage mechanism is a speed reduction mechanism with a set speed ratio, the stroke of the stroke linkage mechanism can be the reciprocal of the speed ratio of the control rod's movement stroke. This makes the stroke of the stroke linkage mechanism the reciprocal of the speed ratio of the control rod's length, which can shorten the stroke of the stroke linkage mechanism, reduce the size of the stroke linkage mechanism, facilitate intuitive measurement and response of the control rod's height in the reactor core, and avoid affecting the layout of other components of the nuclear reactor due to the setting of the measurement mechanism.

[0010] Therefore, the reactor control rod stroke measuring device provided by the present invention can accurately measure the height of the control rod in the reactor core and effectively ensure the safe operation of the reactor.

[0011] In an optional embodiment of this application, the stroke linkage mechanism includes a gear reduction assembly, which includes: a linkage gear capable of being driven and connected to the control rod lifting mechanism; and a driven gear meshing with the linkage gear, wherein the number of teeth of the driven gear is greater than the number of teeth of the linkage gear. The driven gear is driven and connected to the position indicator, thereby connecting the stroke linkage mechanism and the control rod lifting mechanism via the gear reduction mechanism. Compared to other types of reduction mechanisms, this design offers precise driven action, simple structure, and low resistance, ensuring measurement accuracy.

[0012] In an optional embodiment of this application, the driven gear is provided with a lever, which is inserted into the moving part of the position indicator to ensure the reliability and real-time performance of the transmission connection between the driven gear and the position indicator.

[0013] In an optional embodiment of this application, the stroke linkage mechanism further includes a stroke mapping component, which includes: a linkage screw, which is fixedly connected to the driven gear and coaxially arranged with the driven gear; and a mapping slider, which is screwed to the outside of the linkage screw. When the linkage screw rotates, the mapping slider can move along the axial direction of the linkage screw. This allows the position indicator to indicate the height of the control rod in the reactor core, while the linkage screw synchronously drives the mapping slider to move. Thus, the position of the mapping slider synchronously reflects the height of the control rod in the reactor core, providing a direct visual display of the control rod's height within the reactor core. Compared to electronic measurements, this method offers higher reliability and facilitates control of the control rod's position.

[0014] In an optional embodiment of this application, the stroke linkage mechanism further includes: a mounting base, which is mounted on the control rod lifting mechanism in the installation state; a first mounting plate, which is fixed on the mounting base and is perpendicular to the linkage screw; a second mounting plate, which is fixed on the mounting base and is parallel to and spaced apart from the first mounting plate on the same side of the mounting base; and a guide rod, whose two ends are fixedly connected to the corresponding first mounting plate and the second connecting plate, respectively, and the guide rod is movably inserted into the mapping slider; wherein, the two ends of the linkage screw are rotatably connected to the corresponding first mounting plate and the corresponding second mounting plate, respectively, to ensure that the mapping slider can move stably.

[0015] In an optional embodiment of this application, the first mounting plate is located between the driven gear and the mapping slider to avoid interference between the first mounting plate and the connection between the stroke linkage mechanism and the control rod lifting mechanism.

[0016] In an optional embodiment of this application, the linkage gear is rotatably connected to the mounting base, and the linkage gear at least partially protrudes from the side of the mounting base away from the first mounting plate, so as to ensure that the linkage gear can reliably mesh with the gear corresponding to the control rod lifting mechanism.

[0017] In an optional embodiment of this application, the travel linkage mechanism further includes: a first travel switch, which is installed on the side of the first mounting plate facing the mapping slider, and the first travel switch can feed back a switch signal to the control rod drive system; and a first trigger rod, which is installed on the side of the mapping slider facing the first mounting plate; wherein, when the control rod moves to the upper limit position, the first trigger rod triggers the first travel switch, and the first travel switch outputs a switch signal to trigger the first travel switch when the control rod moves to the upper limit position, thereby providing a feedback signal to the control rod control system, which then controls the control rod to stop moving upward, preventing the control rod from moving beyond the upper limit position.

[0018] In an optional embodiment of this application, the length of the first trigger rod protruding from the mapping slider is adjustable, so as to adjust the position of the first trigger rod according to the stacking type and assembly accuracy, thereby precisely adjusting the upper limit position of the control rod.

[0019] In an optional embodiment of this application, the mapping slider is screwed with a first adjusting bolt, and the first trigger rod is installed at the end of the first adjusting bolt facing the first mounting plate, so as to accurately adjust the position of the first trigger rod.

[0020] In an optional embodiment of this application, the travel linkage mechanism further includes: a second travel switch, which is installed on the side of the second mounting plate facing the mapping slider, and the second travel switch can feed back a switch signal to the control rod drive system; and a second trigger rod, which is installed on the side of the mapping slider facing the second mounting plate; wherein, when the control rod moves to the lower limit position, the second trigger rod triggers the second travel switch, and the second travel switch outputs a switch signal to trigger the second travel switch when the control rod moves to the lower limit position, thereby providing a feedback signal to the control rod control system, which then controls the control rod to stop moving downward, preventing the control rod from moving beyond the lower limit position, and ensuring that the control rod always operates within the set travel range.

[0021] In an optional embodiment of this application, the length of the second trigger rod protruding from the mapping slider is adjustable, so as to adjust the position of the second trigger rod according to the stacking type and assembly accuracy, thereby precisely adjusting the lower limit position of the control rod.

[0022] In an optional embodiment of this application, the mapping slider is screwed with a second adjusting bolt, and the second trigger rod is installed at one end of the second adjusting bolt facing the second mounting plate, so as to facilitate precise adjustment of the position of the second trigger rod.

[0023] In an optional embodiment of this application, the position indicator is equipped with a timing module, which can record the movement time of the travel linkage mechanism to keep track of the movement of the travel linkage mechanism, thereby calculating the movement speed of the control rod based on the movement distance and movement time.

[0024] Secondly, the present invention provides a method for measuring the stroke of reactor control rods, based on the aforementioned reactor control rod stroke measuring device, comprising the following steps:

[0025] The reactor control rod stroke measuring device is connected to the control rod lifting mechanism via a transmission connection.

[0026] Based on the data from the position indicator, the height of the control rods within the reactor is calibrated and the real-time rod velocity is calculated.

[0027] The reactor control rod stroke measurement method provided by the present invention connects the aforementioned reactor control rod stroke measurement device with the control rod lifting mechanism, which can map the stroke of the control rod to a position indicator. The position indicator measures the movement stroke of the stroke linkage mechanism, thereby obtaining the stroke of the control rod in the nuclear reactor. This method can accurately measure the height of the control rod in the reactor core, effectively ensuring the safe operation of the reactor.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] 1. The reactor control rod stroke measuring device provided by the present invention includes a stroke linkage mechanism and a position indicator. After the stroke linkage mechanism is connected to the control rod lifting mechanism, the stroke linkage mechanism can move synchronously under the drive of the control rod lifting mechanism. The position indicator is connected to the stroke linkage mechanism and can reflect the movement stroke of the stroke linkage mechanism. Thus, the stroke of the control rod is mapped to the position indicator, so as to measure the movement stroke of the stroke linkage mechanism through the position indicator, thereby obtaining the stroke of the control rod in the nuclear reactor.

[0030] 2. The reactor control rod stroke measuring device provided by the present invention, when the control rod is driven to move by the control rod lifting mechanism, the stroke linkage mechanism operates at a set speed. Since the stroke linkage mechanism is a deceleration mechanism with a set speed ratio, the stroke of the stroke linkage mechanism can be made to be the reciprocal of the speed ratio of the control rod movement stroke, thereby making the stroke of the stroke linkage mechanism the reciprocal of the speed ratio of the control rod length. This can shorten the stroke of the stroke linkage mechanism, reduce the size of the stroke linkage mechanism, facilitate intuitive measurement of the height of the reactor control rod in the reactor core, and avoid affecting the layout of other components of the nuclear reactor due to the setting of the measuring mechanism.

[0031] 3. The reactor control rod stroke measurement method provided by the present invention connects the above-mentioned reactor control rod stroke measurement device with the control rod driving mechanism, which can map the stroke of the control rod to a position indicator, so as to measure the movement stroke of the stroke linkage mechanism through the position indicator, thereby obtaining the stroke of the control rod in the nuclear reactor, and can accurately measure the height of the control rod in the reactor core, effectively ensuring the safe operation of the reactor. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0033] Furthermore, the principles, structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification, so as to enable those skilled in the art to understand and read them, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0034] For those skilled in the art, other related figures can be obtained from these figures without any creative effort.

[0035] In the attached diagram:

[0036] Figure 1 This is a schematic diagram of the structure of the nuclear reactor control rod stroke measuring device provided in an embodiment of the present invention;

[0037] Figure 2 This is a three-dimensional structural schematic diagram of the nuclear reactor control rod stroke measuring device provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of the stroke linkage mechanism of the nuclear reactor control rod stroke measuring device provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of a measurement system provided in an embodiment of the present invention.

[0040] Figure label:

[0041] 1-Position indicator, 2-Linkage gear, 3-Driven gear, 4-Actuating lever, 5-Linkage screw, 6-Mapping slider, 7-Mounting base, 8-First mounting plate, 9-Second mounting plate, 10-Guide rod, 11-First limit switch, 12-First trigger rod, 13-First adjusting bolt, 14-Second limit switch, 15-Second trigger rod, 16-Second adjusting bolt. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0044] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0045] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0046] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] It should be noted that the control rods of a nuclear reactor, through a control rod lifting mechanism, change or maintain the vertical height of the control rod assembly within the reactor core, thereby enabling reactor start-up and shutdown. During normal reactor operation, they also regulate or maintain the core's power level and, in the event of an accident, rapidly lower the rods to shut down the reactor. Therefore, the stroke of the control rods is determined based on the height of the active region of the reactor core (two sets matched), typically 3–4 meters, to ensure that the control rods can effectively control the neutron flux throughout the entire core height. If the position of the control rods were directly indicated by a scale of the same length as the control rods, the measuring scale would be too long, making it difficult to intuitively measure and indicate the height of the control rods within the core. Furthermore, the scale would need to be located outside the core, and a long scale would affect the layout of other reactor components, hindering efforts to reduce the reactor's overall size.

[0048] To solve the aforementioned technical problems, the inventors have innovatively proposed the following technical solutions, specifically:

[0049] Example 1

[0050] Combination Figures 1-4 This embodiment provides a reactor control rod stroke measurement device, including: a stroke linkage mechanism, which is adapted to a reduction mechanism and can be driven to a control rod lifting mechanism; and a position indicator 1, which is driven to the stroke linkage mechanism and can reflect the movement stroke of the stroke linkage mechanism.

[0051] Combination Figure 3It is understood that the reduction mechanism of the stroke linkage mechanism can be a synchronous belt pulley mechanism, a sprocket mechanism, a gear transmission mechanism, etc. In this embodiment, the reduction mechanism is a gear reduction mechanism, that is, the stroke linkage mechanism includes a gear reduction assembly, which includes: a linkage gear 2, which can be driven to the control rod lifting mechanism; and a driven gear 3, which meshes with the linkage gear 2, and the number of teeth of the driven gear 3 is greater than the number of teeth of the linkage gear 2. The driven gear 3 is driven to the position indicator 1, so as to drive the stroke linkage mechanism and the control rod lifting mechanism through the gear reduction mechanism. Compared with other structural forms of reduction mechanisms, the driven mechanism is accurate, the structure is simple, and the resistance is small, which can ensure the accuracy of measurement.

[0052] In this embodiment, multiple reduction gears can be set between the linkage gear 2 mechanism and the driven gear 3 to achieve multi-stage deceleration. In this embodiment, the transmission torque between the gears is relatively small, and two gears with a large difference in the number of teeth can be used to achieve deceleration.

[0053] The driven gear 3 is equipped with a lever 4, which is inserted into the moving part of the position indicator 1 to ensure the reliability and real-time performance of the transmission connection between the driven gear 3 and the position indicator 1.

[0054] Based on this, the stroke linkage mechanism also includes a stroke mapping component, which includes: a linkage screw 5, which is fixedly connected to the driven gear 3 and is coaxially arranged with the driven gear 3; and a mapping slider 6, which is screwed to the outside of the linkage screw 5. When the linkage screw 5 rotates, the mapping slider 6 can move along the axial direction of the linkage screw 5. At the same time, the position indicator 1 indicates the height of the control rod in the nuclear reactor core, and the linkage screw 5 synchronously drives the mapping slider 6 to move. Thus, the position of the mapping slider 6 synchronously reflects the height of the control rod in the nuclear reactor core, thereby intuitively displaying the height of the control rod in the nuclear reactor core. Compared with electronic measurement, this method has high reliability and facilitates the control of the position of the control rod.

[0055] Combination Figure 2Specifically, the stroke linkage mechanism further includes: a mounting base 7, which is mounted on the control rod lifting mechanism in the installation state; a first mounting plate 8, which is fixed on the mounting base 7 and is perpendicular to the linkage screw 5; a second mounting plate 9, which is fixed on the mounting base 7 and is parallel to and spaced apart from the first mounting plate 8 on the same side of the mounting base 7; and a guide rod 10, whose two ends are fixedly connected to the corresponding first mounting plate 8 and the second connecting plate, respectively, and the guide rod 10 is movably inserted into the mapping slider 6; wherein, the two ends of the linkage screw 5 are rotatably connected to the corresponding first mounting plate 8 and the corresponding second mounting plate 9, respectively, to ensure that the mapping slider 6 can move stably.

[0056] The first mounting plate 8 is located between the driven gear 3 and the mapping slider 6 to avoid interference between the first mounting plate 8 and the connection between the stroke linkage mechanism and the control rod lifting mechanism.

[0057] It is understood that the linkage gear 2 is rotatably connected to the mounting base 7, and the linkage gear 2 at least partially protrudes from the side of the mounting base 7 away from the first mounting plate 8, so as to ensure that the linkage gear 2 can reliably mesh with the gear corresponding to the control rod lifting mechanism.

[0058] Furthermore, the travel linkage mechanism further includes: a first travel switch 11, which is installed on the side of the first mounting plate 8 facing the mapping slider 6, and the first travel switch 11 can feed back a switch signal to the control rod drive system; and a first trigger rod 12, which is installed on the side of the mapping slider 6 facing the first mounting plate 8. When the control rod moves to its upper limit position, the first trigger rod 12 triggers the first travel switch 11, and the first travel switch 11 outputs a switch signal. This triggers the first travel switch 11 when the control rod moves to its upper limit position, providing a feedback signal to the control rod control system, which then controls the control rod to stop moving upwards, preventing the control rod from moving beyond its upper limit position.

[0059] In this embodiment, the length of the first trigger rod 12 protruding from the mapping slider 6 is adjustable, so as to adjust the position of the first trigger rod 12 according to the stacking type and assembly accuracy, thereby precisely adjusting the upper limit position of the control rod.

[0060] Preferably, the mapping slider 6 is screwed with a first adjusting bolt 13, and the first trigger rod 12 is installed at the end of the first adjusting bolt 13 facing the first mounting plate 8, so as to accurately adjust the position of the first trigger rod 12.

[0061] Accordingly, the stroke linkage mechanism further includes: a second stroke switch 14, which is installed on the side of the second mounting plate 9 facing the mapping slider 6, and the second stroke switch 14 can feed back a switch signal to the control rod drive system; and a second trigger rod 15, which is installed on the side of the mapping slider 6 facing the second mounting plate 9. When the control rod moves to the lower limit position, the second trigger rod 15 triggers the second stroke switch 14, and the second stroke switch 14 outputs a switch signal to trigger the second stroke switch 14 when the control rod moves to the lower limit position. The second stroke switch 14 provides a feedback signal to the control rod control system, which then controls the control rod to stop moving downwards, preventing the control rod from moving beyond the lower limit position and ensuring that the control rod always operates within the set stroke.

[0062] Similarly, the length of the second trigger rod 15 protruding from the mapping slider 6 is adjustable, so as to adjust the position of the second trigger rod 15 according to the stacking type and assembly accuracy, thereby precisely adjusting the lower limit position of the control rod.

[0063] It is known that the mapping slider 6 is screwed with a second adjusting bolt 16, and the second trigger rod 15 is installed at one end of the second adjusting bolt 16 that is directly opposite the second mounting plate 9, so as to accurately adjust the position of the second trigger rod 15.

[0064] In this embodiment, the position indicator 1 can be an angular displacement sensor, typically a synchro or encoder. Correspondingly, the actuating lever 4 is inserted into the encoder disk. The position indicator 1 consists of a transmitting end and a receiving end. When the gear rotates, the transmitting end of the position indicator 1 sends out a rod position signal, and the receiving end analyzes the control rod position information.

[0065] In this embodiment, the position indicator 1 is equipped with a timing module, which can record the movement time of the travel linkage mechanism. When the position of the control rod changes, the timing module is triggered. Thus, by measuring the change in the position of the control rod and the time, the rod speed of the control rod can be calculated and displayed at the receiving end of the position indicator 1.

[0066] In summary, the reactor control rod stroke measuring device provided in this embodiment includes a stroke linkage mechanism and a position indicator 1. In use, the stroke linkage mechanism is connected to the control rod lifting mechanism so that the stroke linkage mechanism moves synchronously under the drive of the control rod lifting mechanism. The position indicator 1 is connected to the stroke linkage mechanism and can reflect the movement stroke of the stroke linkage mechanism. Thus, the stroke of the control rod is mapped to the position indicator 1, so that the movement stroke of the stroke linkage mechanism can be measured through the position indicator 1, thereby obtaining the stroke of the control rod in the nuclear reactor.

[0067] In other words, in this embodiment, the linkage gear 2 meshes with the drive gear on the control rod drive mechanism. When the driven gear 3 rotates, it drives the linkage screw 5 to rotate synchronously. When the linkage screw 5 rotates, it drives the mapping slider 6 to move on the linkage screw 5. Thus, the control rod stroke is mapped to the slider's stroke on the screw through the gear reduction ratio, and the upper and lower limit switches form the electrical limit of the stroke. When the slider moves to the limit switch position, it will cause the contact state inside the limit switch to change, and send the contact signal to the control rod drive device to de-energize the drive circuit, ensuring that the control rod stroke always moves within the specified range. Furthermore, the linkage screw 5 also rotates coaxially with the position indicator 1, which can convert the rotation angle information of the linkage screw 5 into the displacement of the control rod in the reactor, and can also calculate the real-time rod speed based on the control rod displacement and movement time.

[0068] When the control rod lifting mechanism drives the control rod to move, the stroke linkage mechanism operates at a set speed. Since the stroke linkage mechanism is a speed reduction mechanism with a set speed ratio, the stroke of the stroke linkage mechanism can be the reciprocal of the speed ratio of the control rod's movement stroke. This makes the stroke of the stroke linkage mechanism the reciprocal of the speed ratio of the control rod's length, which can shorten the stroke of the stroke linkage mechanism, reduce the size of the stroke linkage mechanism, facilitate intuitive measurement and response of the control rod's height in the reactor core, and avoid affecting the layout of other components of the nuclear reactor due to the setting of the measurement mechanism.

[0069] In summary, the reactor control rod stroke measuring device provided in this embodiment can accurately measure the height of the control rod in the reactor core and effectively ensure the safe operation of the reactor. It features simple structure, flexible installation, high reliability, and low cost, and can meet the measurement requirements of control rod position and velocity in the reactor under most circumstances.

[0070] Example 2

[0071] This embodiment provides a method for measuring the stroke of reactor control rods, based on the reactor control rod stroke measuring device described in Embodiment 1, including the following steps:

[0072] The reactor control rod stroke measuring device is connected to the control rod lifting mechanism via a transmission connection.

[0073] Based on the data from the position indicator 1, the height of the control rods within the reactor is calibrated and the real-time rod velocity is calculated.

[0074] It is understood that the reactor control rod stroke measurement method provided in this embodiment connects the above-mentioned reactor control rod stroke measurement device with the control rod driving mechanism, which can map the stroke of the control rod to the position indicator 1, so as to measure the movement stroke of the stroke linkage mechanism through the position indicator 1, thereby obtaining the stroke of the control rod in the nuclear reactor, and can accurately measure the height of the control rod in the reactor core, effectively ensuring the safe operation of the reactor.

[0075] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A reactor control rod travel measuring device characterized by, The application relates to a position indicator for a control rod drive mechanism. The position indicator comprises: a stroke linkage mechanism, which is adapted with a speed reduction mechanism and can be in transmission connection with the control rod drive mechanism; 2. The reactor control rod travel measuring device of claim 1, wherein, a position indicator (1), which is in transmission connection with the stroke linkage mechanism and can reflect the movement stroke of the stroke linkage mechanism. The stroke linkage mechanism comprises a gear speed reduction assembly, which comprises: a linkage gear (2), which can be in transmission connection with the control rod drive mechanism; a driven gear (3), which is in mesh with the linkage gear (2) and has a larger number of teeth than the linkage gear (2); 3. The reactor control rod travel measuring device of claim 2, wherein, wherein the driven gear (3) is in transmission connection with the position indicator (1).

4. The reactor control rod travel measuring device of claim 2, wherein, The driven gear (3) is provided with a push rod (4) which is inserted into a moving part of the position indicator (1). The stroke linkage mechanism further comprises a stroke mapping assembly, which comprises: a linkage screw (5), which is fixedly connected with the driven gear (3) and coaxially arranged with the driven gear (3); 5. The reactor control rod travel measuring device of claim 4, wherein, a mapping slider (6) which is screwed on the linkage screw (5) and can move along the axial direction of the linkage screw (5) under the condition that the linkage screw (5) rotates. The stroke linkage mechanism further comprises: a mounting base (7) which is mounted on the control rod drive mechanism in a mounting state; a first mounting plate (8) which is fixed on the mounting base (7) and is arranged perpendicularly to the linkage screw (5); a second mounting plate (9) which is fixed on the mounting base (7) and is arranged on the same side of the mounting base (7) in parallel and spaced apart from the first mounting plate (8); a guide rod (10) which is fixedly connected with the corresponding first mounting plate (8) and second mounting plate (9) at both ends and is movably inserted into the mapping slider (6); 6. The reactor control rod travel measuring device of claim 5, wherein, wherein both ends of the linkage screw (5) are rotatably connected with the corresponding first mounting plate (8) and second mounting plate (9).

7. The reactor control rod travel measuring device of claim 5, wherein, The first mounting plate (8) is located between the driven gear (3) and the mapping slider (6).

8. The reactor control rod travel measuring device of claim 5, wherein, The linkage gear (2) is rotatably connected with the mounting base (7) and at least partially protrudes from the side of the mounting base (7) away from the first mounting plate (8). The stroke linkage mechanism further comprises: a first stroke switch (11) which is mounted on the side of the first mounting plate (8) opposite to the mapping slider (6) and can feed a switch signal to the control rod drive system. A first trigger lever (12) is installed on the side of the mapping slider (6) facing the first mounting plate (8); Wherein, when the control rod moves to the upper limit position, the first trigger lever (12) triggers the first travel switch (11), and the first travel switch (11) outputs a switch signal.

9. The reactor control rod travel measuring device of claim 8, wherein, The length of the first trigger lever (12) protruding from the mapping slider (6) can be adjusted.

10. The reactor control rod travel measuring device of claim 9, wherein, The mapping slider (6) is screwed with a first adjusting bolt (13), and the first trigger lever (12) is installed on the end of the first adjusting bolt (13) facing the first mounting plate (8).

11. The reactor control rod travel measuring device of claim 8, wherein, The travel linkage mechanism further comprises: A second travel switch (14) is installed on the side of the second mounting plate (9) facing the mapping slider (6), and the second travel switch (14) can feed back a switch signal to the control rod drive system; A second trigger lever (15) is installed on the side of the mapping slider (6) facing the second mounting plate (9); Wherein, when the control rod moves to the lower limit position, the second trigger lever (15) triggers the second travel switch (14), and the second travel switch (14) outputs a switch signal.

12. The reactor control rod travel measuring device of claim 11, wherein, The length of the second trigger lever (15) protruding from the mapping slider (6) can be adjusted.

13. The reactor control rod travel measuring device of claim 12, wherein, The mapping slider (6) is screwed with a second adjusting bolt (16), and the second trigger lever (15) is installed on the end of the second adjusting bolt (16) facing the second mounting plate (9).

14. The reactor control rod travel measuring apparatus according to any one of claims 1 to 13, characterized by The position indicator (1) is adapted with a timing module, which can record the movement time of the travel linkage mechanism.

15. A reactor control rod travel measurement method, characterized by, The reactor control rod travel measuring device according to any one of claims 1-14, comprising the following steps: The reactor control rod travel measuring device is drivingly connected with the control rod drive mechanism; According to the data of the position indicator (1), the height of the control rod in the reactor is calibrated and the real-time rod speed of the control rod is calculated.

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