Control rod drive

Abstract

The present invention relates to the field of reactor engineering technology, and in particular to a control rod drive device, the control rod drive device comprising a housing, a transmission shaft and a traction rope, the housing having a housing cavity, the transmission shaft being arranged in the housing cavity, the transmission shaft being rotatable relative to the housing, a hub assembly being arranged in the housing cavity, the hub assembly being sleeved on the transmission shaft, the hub assembly rotating with the transmission shaft, and the hub assembly being movable in the axial direction of the transmission shaft, one end of the traction rope being connected to the hub assembly, and the other end of the traction rope being suitable for being connected to a control rod. The control rod drive device of the present invention can avoid the traction rope from being stacked, and improve the accuracy of the rod position measurement.

Description

Technical Field

[0001] The present invention relates to the field of reactor engineering technology, and in particular to a control rod driving device. Background Art

[0002] The high temperature gas-cooled reactor is an advanced reactor type with the characteristics of the fourth generation reactor. It has the advantages of good inherent safety, high power generation efficiency, good economy and wide application. It can replace traditional fossil energy and achieve coordinated development of economy and ecological environment. The high temperature gas-cooled reactor control rod drive device in the related technology generally adopts a traction rope-hub structure to control the lifting and lowering of the control rod. As the traction rope is wrapped around the hub, the traction rope will overlap, resulting in inaccurate rod position measurement and unstable control rod operation. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a control rod driving device, which can avoid the overlapping of traction ropes and improve the accuracy of rod position measurement.

[0004] A control rod driving device according to an embodiment of the present invention comprises: a housing having a receiving cavity therein;

[0005] A transmission shaft, the transmission shaft is disposed in the accommodating cavity and is rotatable relative to the housing;

[0006] A hub assembly, wherein the hub assembly is disposed in the accommodating cavity, the hub assembly is sleeved on the transmission shaft, the hub assembly rotates with the transmission shaft, and the hub assembly is movable in the axial direction of the transmission shaft; a traction rope, wherein one end of the traction rope is connected to the hub assembly, and the other end of the traction rope is suitable for being connected to a control rod.

[0007] The control rod driving device of the embodiment of the present invention can avoid the overlapping of the traction ropes and improve the accuracy of the rod position measurement.

[0008] In some embodiments, the control rod drive device also includes a guide tube, the hub assembly includes a collecting tube and a connecting component, one end of the collecting tube is connected to one end of the connecting component, the connecting component is arranged in the guide tube, an internal thread is provided in the guide tube, and an external thread meshing with the internal thread is provided on the outer peripheral surface of the connecting component.

[0009] In some embodiments, a wire groove is provided on the outer circumferential surface of the collecting cylinder, and the wire groove is spirally arranged on the outer wall surface of the collecting cylinder along the axial direction of the transmission shaft, and the collecting cylinder moves upward along the axial direction of the transmission shaft.

[0010] In some embodiments, the control rod driving device further includes a plurality of limiting components, the plurality of limiting components are disposed in the accommodating cavity, and the plurality of limiting components are spaced apart in the axial direction of the transmission shaft.

[0011] In some embodiments, the control rod driving device further includes a driving member, one end of which is connected to the transmission shaft to drive the transmission shaft to rotate.

[0012] In some embodiments, the control rod driving device further comprises a speed changing component and a braking component, one end of the speed changing component is connected to the driving member, and the other end of the speed changing component is suitable for being connected to the transmission shaft.

[0013] In some embodiments, the control rod driving device further includes an angle measuring component, and the angle measuring component is sleeved on the transmission shaft to detect the rotation angle of the transmission shaft.

[0014] In some embodiments, the control rod drive device further includes a guide wheel assembly, the traction rope is wound around the guide wheel assembly, one end of the traction rope is connected to the control rod, and the other end of the traction rope is connected to the hub assembly.

[0015] In some embodiments, the guide wheel assembly includes a guide wheel frame, a first conduction piece, a second conduction piece, a connecting rod component and an elastic member, the first conduction piece at least partially extends into the guide wheel frame, the second conduction piece is connected to the connecting rod component, and the second conduction piece is located on a side of the connecting rod component adjacent to the first conduction piece, the elastic member is sleeved on the connecting rod component, one end of the elastic member abuts against an end of the connecting rod component away from the control rod, the other end of the elastic member abuts against the guide wheel frame, the other end of the connecting rod component is connected to the traction rope, and the other end of the connecting rod component is suitable for carrying the traction rope.

[0016] In some embodiments, the control rod drive device further comprises a calibration component, wherein the calibration component is disposed between the control rod and the guide wheel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a control rod driving device according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the middle limit component.

[0019] Reference numerals:

[0020] Shell 1, transmission shaft 2, traction rope 3, guide cylinder 4,

[0021] Hub assembly 5, collecting tube 51, connecting component 52,

[0022] Limiting component 6, first electrode 61, second electrode 62, spring 63, conducting ring 64, moving part 65, limiting component body 66,

[0023] Guide wheel assembly 7, driving component 8, angle measuring component 9, speed changing component 10, braking component 11, calibration component 12, control rod 13. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] like Figure 1 As shown, the control rod driving device of the embodiment of the present invention includes a shell 1, a transmission shaft 2, a hub assembly 5 and a traction rope 3. The shell 1 has a accommodating cavity, the transmission shaft 2 is arranged in the accommodating cavity, the transmission shaft 2 is rotatable relative to the shell 1, the hub assembly 5 is arranged in the accommodating cavity, the hub assembly 5 is sleeved on the transmission shaft 2, the hub assembly 5 rotates with the transmission shaft 2, and the hub assembly 5 is movable in the axial direction of the transmission shaft 2, one end of the traction rope 3 is connected to the hub assembly 5, and the other end of the traction rope 3 is suitable for being connected to the control rod.

[0026] Specifically, Figure 1 As shown, the transmission shaft 2 extends up and down, and the transmission shaft 2 is rotatable relative to the shell 1. The hub assembly 5 is sleeved on the transmission shaft 2, and the hub assembly 5 rotates with the transmission shaft 2 to collect the traction rope 3, and when the transmission shaft 2 drives the hub assembly 5 to rotate, it can also drive the hub assembly 5 to move in the up and down directions. For example, the transmission shaft 2 drives the hub assembly 5 to rotate counterclockwise to collect the traction rope 3, and the hub assembly 5 rises to avoid the traction rope 3 from stacking, or the transmission shaft 2 drives the hub assembly 5 to rotate clockwise to release the traction rope 3, and then the hub assembly 5 collects the traction rope 3, that is, the hub assembly 5 collects or releases the traction rope 3 by rotating up or down.

[0027] The control rod drive device of the embodiment of the present invention is provided with a hub assembly 5, and the hub assembly 5 collects or releases the traction rope 3 by rotating up or down, which can avoid overlapping between the traction ropes 3 and improve the accuracy of rod position measurement.

[0028] In some embodiments, the control rod drive device also includes a guide tube 4, the hub assembly 5 includes a collecting tube 51 and a connecting component 52, one end of the collecting tube 51 is connected to one end of the connecting component 52, the connecting component 52 is arranged in the guide tube 4, the guide tube 4 is provided with an internal thread, and the outer peripheral surface of the connecting component 52 is provided with an external thread meshing with the internal thread.

[0029] Specifically, Figure 1 As shown, the control rod driving device also includes a guide cylinder 4, which extends up and down and is provided with an internal thread. The collecting cylinder 51 extends up and down, and the connecting component 52 extends up and down. The lower end of the collecting cylinder 51 is connected to the upper end of the connecting component 52, or the collecting cylinder 51 and the connecting component 52 are integrally formed to improve the structural strength of the hub assembly 5. The radial dimension of the connecting component 52 is larger than the radial dimension of the collecting cylinder 51. The connecting component 52 is connected to the guide cylinder 4 by threads, and the transmission shaft 2 drives the connecting component 52 and the collecting cylinder 51 to rotate. The connecting component 52 is connected to the guide cylinder 4 by threads to improve the smoothness and stability of the rotation and up and down movement of the hub assembly 5.

[0030] The control rod driving device of the embodiment of the present invention is provided with a guide cylinder 4, and the connecting component 52 is connected to the guide cylinder 4 by threads to improve the smoothness and stability of the rotation and up and down movement of the hub assembly 5, thereby improving the accuracy of the rod position measurement.

[0031] In some embodiments, a wire groove is provided on the outer circumferential surface of the collecting cylinder 51 , and the wire groove is spirally arranged on the outer wall surface of the collecting cylinder 51 along the axial direction of the transmission shaft 2 , and the collecting cylinder 51 moves upward along the axial direction of the transmission shaft 2 .

[0032] Specifically, Figure 1 As shown, a wire groove is provided on the outer circumference of the collecting cylinder 51, and the wire groove is spirally arranged on the outer wall of the collecting cylinder 51 in the up-down direction. The rotation of the transmission shaft 2 drives the collecting cylinder 51 to rotate, and the threaded connection between the connecting component 52 and the guide cylinder 4 further ensures that the hub assembly 5 can move up and down while rotating. The wire groove is suitable for carrying the traction rope 3, and the wire groove is suitable for limiting the traction rope 3 to prevent the traction rope 3 from being stacked when the collecting cylinder 51 collects the traction rope 3.

[0033] The control rod drive device of the embodiment of the present invention is provided with a wire groove, which is suitable for carrying the traction rope 3. The wire groove is suitable for limiting the traction rope 3 to avoid stacking of the traction rope 3 when the collecting cylinder 51 collects the traction rope 3, thereby improving the accuracy of the rod position measurement.

[0034] In some embodiments, the control rod driving device further includes a plurality of limiting components 6 , which are disposed in the accommodating cavity and are spaced apart in the axial direction of the transmission shaft 2 .

[0035] Specifically, Figure 1 and Figure 2As shown, the number of the limiting components 6 can be two, and the two limiting components 6 are arranged at a relative interval at the upper and lower ends of the transmission shaft 2. The control rod drive device also includes a controller, which is suitable for controlling the rotation of the transmission shaft 2. The limiting component 6 is arranged in the accommodating cavity, and one end of the limiting component 6 is connected to the inner wall surface of the shell 1. When the hub assembly 5 moves up and down beyond the allowable range, the hub assembly 5 hits the limiting component 6, and the limiting component 6 transmits the impact signal to the controller. The controller is suitable for controlling the transmission shaft 2 to brake the hub assembly 5, or the controller is suitable for controlling the transmission shaft 2 to lower or raise the hub assembly 5 to stay away from the limiting component 6, so as to avoid the hub assembly 5 from moving in the up and down direction beyond the safety range, thereby improving the stability and safety of the control rod drive device.

[0036] Optionally, the control rod drive device further includes a driving member 8, one end of which is connected to the transmission shaft 2 to drive the transmission shaft 2 to rotate. Alternatively, a controller is connected to the driving member 8 to control the opening or closing of the driving member 8, and the controller can also control the output power of the driving member 8 to adjust the rotation rate of the transmission shaft 2.

[0037] The driving member 8 can be a double-winding stepping motor with a one-in-one-standby winding setting. The output shaft is in the form of an external spline or flat key connection, connected to the transmission shaft 2. The lower end surface of the driving member 8 has a mounting hole for installation and fixation.

[0038] The limiting component 6 includes a first electrode 61, a second electrode 62, a spring 63, a conductive ring 64, a moving member 65 and a limiting component body 66. The limiting component body 66 has a receiving groove. The first electrode 61 and the second electrode 62 are connected to the controller. The first electrode 61 and the second electrode 62 are arranged relatively spaced apart, and the first electrode 61 and the second electrode 62 at least partially extend into the receiving groove. One end of the spring 63 abuts against the inner wall surface of the receiving groove, and the other end of the spring 63 is connected to the moving member 65. The other end of the moving member 65 is suitable for being connected to one end of the conductive ring 64. When the hub assembly 5 collides with the limiting component 6, the hub assembly 5 contacts the moving member 65 to push the moving member 65 to move, thereby driving the conductive sheet to move. After the conductive sheet moves, the first electrode 61 and the second electrode 62 are conductively connected. At this time, the conductive signal is transmitted to the controller, and then the controller controls the driving member 8 to brake, or the controller controls the driving member 8 to rotate in the opposite direction to ensure the stability and safety of the control rod drive device.

[0039] In some embodiments, the control rod driving device further includes a speed changing component 10 and a braking component 11 , one end of the speed changing component 10 is connected to the driving member 8 , and the other end of the speed changing component 10 is suitable for being connected to the transmission shaft 2 .

[0040] Specifically, Figure 1As shown, one end of the speed change component 10 is connected to the driving member 8 to adjust the rotational speed of the transmission shaft 2 driven by the driving member 8. The speed change component 10 includes a speed change portion and a coupling portion. The upper end of the speed change portion is connected to the output shaft of the driving member 8, the lower end of the transmission is connected to the upper end of the coupling portion, the lower end of the coupling portion is connected to the upper end of the transmission shaft 2, and the coupling portion rotates to drive the transmission shaft 2 to rotate. The transmission can reduce the rotational speed transmitted from the output shaft of the driving member 8 to the coupling portion, and the transmission can reduce the torque transmitted from the output shaft of the driving member 8 to the coupling portion to adapt to different usage ranges.

[0041] The braking component 11 is sleeved on the coupling part to brake the coupling part during braking. Optionally, the braking component 11 can be an electromagnetic damper.

[0042] In some embodiments, the control rod driving device further includes an angle measuring component 9 , which is sleeved on the transmission shaft 2 to detect the rotation angle of the transmission shaft 2 .

[0043] Specifically, Figure 1 As shown, one end of the angle measuring component 9 is connected to the housing 1, and the other end of the angle measuring component 9 is connected to the transmission shaft 2 to monitor the rotation angle of the transmission shaft 2, thereby determining the rotation angle of the hub assembly 5, thereby determining the position of the control rod.

[0044] For example, the angle measuring component 9 is an electromagnetic sensor, which is a small AC motor for measuring angles, used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object, and is composed of a stator and a rotor. The working principle of the angle measuring component 9 is basically similar to that of an ordinary transformer, except that the primary and secondary windings of an ordinary transformer are relatively fixed, so the ratio of the output voltage to the input voltage is a constant, while the primary and secondary windings of the angle measuring component 9 change their relative positions with the angular displacement of the rotor, so the magnitude of its output voltage changes with the angular displacement of the rotor, and the voltage amplitude of the output winding is in a sine and cosine function relationship with the rotor angle, or maintains a fixed proportional relationship, or is in a linear relationship with the angle within a certain angular range. The angle measuring component 9 can be used to transmit the angle or electrical signal in a synchronous follow-up system and a digital follow-up system.

[0045] In some embodiments, the control rod drive device also includes a guide wheel assembly 7, the traction rope 3 is wound around the guide wheel assembly 7, one end of the traction rope 3 is connected to the control rod, and the other end of the traction rope 3 is connected to the hub assembly 5.

[0046] Specifically, Figure 1As shown, one end of the guide wheel assembly 7 is connected to the housing 1, and the other end of the guide wheel assembly 7 is suitable for winding the traction rope 3, that is, the lower end of the guide wheel assembly 7 is suitable for winding the traction rope 3, and the guide wheel assembly 7 is suitable for steering the traction rope 3 to avoid the collected traction rope 3 on the hub assembly 5 from falling downward when the gravity of the control rod acts on the traction rope 3, thereby improving the stability and safety of the control rod drive device.

[0047] In some embodiments, the guide wheel assembly 7 includes a guide wheel frame, a first conduction plate, a second conduction plate, a connecting rod component and an elastic member, the first conduction plate at least partially extends into the guide wheel frame, the second conduction plate is connected to the connecting rod component, and the second conduction plate is located on the side of the connecting rod component adjacent to the first conduction plate, the elastic member is sleeved on the connecting rod component, one end of the elastic member abuts against an end of the connecting rod component away from the control rod, the other end of the elastic member abuts against the guide wheel frame, the other end of the connecting rod component is connected to the traction rope 3, and the other end of the connecting rod component is suitable for bearing the traction rope 3.

[0048] Specifically, Figure 1 As shown, the controller is connected to the first conductive piece, the lower end of the first conductive piece at least partially extends into the guide wheel frame, the connecting rod component includes a connecting portion and an abutting portion, the upper end of the connecting portion is connected to the abutting portion, the lower end of the connecting portion is suitable for winding the traction rope 3, that is, the lower end of the connecting portion is suitable for carrying the traction rope 3, for example, the lower end of the connecting portion is provided with a groove, the traction rope 3 is suitable for being placed in the groove, and the groove is suitable for applying lubricating oil to facilitate the sliding of the traction rope 3. The guide wheel frame has an accommodating space, the accommodating space is cylindrical, the abutting portion is cylindrical, the connecting portion is cylindrical, the radial dimension of the abutting portion is larger than the radial dimension of the connecting portion, the elastic member is sleeved on the outer peripheral surface of the connecting portion, one end of the elastic member abuts the abutting portion, and the other end of the elastic member abuts the inner wall surface of the guide wheel frame, the second conductive piece is connected to the abutting portion, when the traction rope 3 does not carry the control rod, the elastic member pushes the abutting portion of the connecting rod component to move upward to make the second conductive piece contact with the first conductive piece, and at this time, the first conductive piece is suitable for transmitting the contact signal to the controller.

[0049] Alternatively, when the traction rope 3 carries the control rod, the connecting rod component moves downward to separate the second conductive piece from the first conductive piece. At this time, the first conductive piece transmits a signal that the second conductive piece is not in contact with the first conductive piece to the controller. The control rod driving device also includes an alarm. The controller is connected to the alarm. When the first conductive piece transmits a signal that the second conductive piece is not in contact with the first conductive piece to the controller, that is, when a rod drop accident occurs, the controller controls the alarm to sound an alarm.

[0050] Optionally, one end of the connecting portion that carries the traction rope 3 is provided with a guide wheel, and the guide wheel is suitable for carrying the traction rope 3.

[0051] In some embodiments, the control rod driving device further includes a calibration component 12 , which is disposed between the control rod and the guide wheel assembly 7 .

[0052] Specifically, Figure 1 As shown, one end of the calibration component 12 is connected to the housing 1 , and one end of the calibration component 12 is also connected to the controller. The calibration component 12 is arranged between the control rod and the guide wheel assembly 7 .

[0053] That is, the calibration component 12 is located on the path of the control rod moving up and down. Since the length of the traction rope 3 will increase during use, which will affect the change of the rod position of the control rod, when the control rod drive device needs to be calibrated, the control rod moves upward to contact the calibration component 12. At this time, the calibration component 12 transmits a calibration signal to the controller, resets the control rod position at this time to zero, or sets the control rod position at this time to the initial position.

[0054] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0056] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0058] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A control rod drive device, characterized in that: include: A housing having a receiving cavity therein; A transmission shaft, the transmission shaft is disposed in the accommodating cavity and is rotatable relative to the housing; A hub assembly, the hub assembly is arranged in the accommodating cavity, the hub assembly is sleeved on the transmission shaft, the hub assembly rotates with the transmission shaft, and the hub assembly is movable in the axial direction of the transmission shaft; A traction rope, one end of which is connected to the hub assembly, and the other end of which is suitable for being connected to a control rod, wherein the hub assembly collects or releases the traction rope by rotating up or down; The guide cylinder, the hub assembly includes a collecting cylinder and a connecting component, one end of the collecting cylinder is connected to one end of the connecting component, the connecting component is arranged in the guide cylinder, the guide cylinder is provided with an internal thread, the outer circumferential surface of the connecting component is provided with an external thread meshing with the internal thread, the outer circumferential surface of the collecting cylinder is provided with a wire groove, the wire groove is spirally arranged on the outer wall surface of the collecting cylinder along the axial direction of the transmission shaft, and the collecting cylinder moves upward along the axial direction of the transmission shaft.

2. The control rod drive device according to claim 1, characterized in that: It also includes a plurality of limiting components, which are arranged in the accommodating cavity and are spaced apart in the axial direction of the transmission shaft.

3. The control rod drive device according to claim 1, characterized in that: It also includes a driving member, one end of which is connected to the transmission shaft to drive the transmission shaft to rotate.

4. The control rod drive device according to claim 3, characterized in that: It also includes a speed change component and a brake component. One end of the speed change component is connected to the driving member, and the other end of the speed change component is suitable for being connected to the transmission shaft.

5. The control rod drive device according to any one of claims 1 to 4, characterized in that: It also includes an angle measuring component, which is sleeved on the transmission shaft to detect the rotation angle of the transmission shaft.

6. The control rod drive device according to claim 1, characterized in that: It also includes a guide wheel assembly, the traction rope is wound around the guide wheel assembly, one end of the traction rope is connected to the control rod, and the other end of the traction rope is connected to the hub assembly.

7. The control rod drive device according to claim 6, characterized in that: The guide wheel assembly includes a guide wheel frame, a first conduction piece, a second conduction piece, a connecting rod component and an elastic member, the first conduction piece at least partially extends into the guide wheel frame, the second conduction piece is connected to the connecting rod component, and the second conduction piece is located on a side of the connecting rod component adjacent to the first conduction piece, the elastic member is sleeved on the connecting rod component, one end of the elastic member abuts against an end of the connecting rod component away from the control rod, the other end of the elastic member abuts against the guide wheel frame, the other end of the connecting rod component is connected to the traction rope, and the other end of the connecting rod component is suitable for bearing the traction rope.

8. The control rod drive device according to claim 7, characterized in that: It also includes a calibration component, which is arranged between the control rod and the guide wheel assembly.

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