A multifunctional control rod drive mechanism performance test device

Abstract

The present invention relates to the technical field of nuclear reactors. The present invention provides a multifunctional control rod drive mechanism performance test device, comprising a cylinder, a guide cylinder, a counterweight assembly, and a buffer seat. Through the mutual cooperation of the tube seat, the fixing ring, and the head, the misalignment amount of the drive mechanism test can be adjusted to meet the different misalignment amount requirements of different models of drive mechanisms. Through the mutual cooperation of the counterweight rod, the counterweight block, and the screw, the operating stroke and the drag load of the drive mechanism can be adjusted to meet the test requirements of different operating strokes and different drag loads of different models of drive mechanisms. Through the mutual cooperation of the adjustment orifice plate and the adjustment cylinder, the buffer resistance of the drive mechanism can be adjusted with high precision to meet the test requirements of different buffer resistances of different models of drive mechanisms, and the test requirements of multiple working conditions and multiple test conditions of different models of drive mechanisms are met, thereby improving the versatility and flexibility of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear reactors, and in particular to a multifunctional control rod drive mechanism performance test device. Background Art

[0002] The reactor contains multiple control rod drive mechanisms (CRDMs). Each CRDM is installed within a corresponding tube socket seal on the pressure vessel head. These mechanisms drive control rods within the reactor at a constant speed, thereby regulating the reactivity of the core and enabling startup, power regulation, power compensation, and shutdown. In the event of a reactor accident, after the CRDMs lose power, the control rods can be rapidly inserted into the core under their own weight within a specified timeframe, ensuring an emergency shutdown of the reactor. Furthermore, the impact of the rapid drop of the control rods does not damage the reactor. Therefore, as the actuator of the reactor control and nuclear safety protection system, the rationality of the CRDM design is directly related to the inherent safety and operational stability of the nuclear reactor. To ensure that the basic functions and performance indicators of the CRDMs meet design requirements, a series of cold and hot performance and assessment tests are required.

[0003] In the past, due to the limited number of CRDM models and the relatively simple testing conditions, test equipment only needed to meet one or two conditions or conditions. However, with the iterative development of nuclear reactors, the existing CRDM models and structures have been continuously optimized, resulting in the inability of existing test equipment to meet the increasingly complex testing requirements of new CRDM models. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional control rod drive mechanism performance test device to solve the above technical problems, meet the test requirements of multiple working conditions and multiple test conditions of different models of drive mechanisms, and improve the versatility and flexibility of the device.

[0005] The present invention is achieved through the following technical solutions: a multifunctional control rod drive mechanism performance test device, including a cylinder, a guide cylinder is coaxially arranged inside the cylinder, a counterweight assembly is vertically slidably connected in the guide cylinder, the counterweight assembly includes an adjusting rod, a counterweight block is connected to the adjusting rod, a plurality of threaded holes for matching and connecting screws of different specifications are opened on the counterweight block, a buffer head is provided at the bottom of the counterweight assembly, a buffer seat matching with the buffer head is connected to the bottom of the guide cylinder, the buffer seat includes a buffer cylinder and a connecting seat, an adjusting cylinder for adjusting the gap between the buffer head and the buffer cylinder is fitted on the inner wall of the buffer cylinder, and the connecting seat is connected to the bottom of the guide cylinder.

[0006] Furthermore, the adjusting rod is provided as a plurality of sections that are detachably connected.

[0007] Furthermore, the connecting seat is provided with a through hole communicating with the inner cavity of the buffer cylinder, and the bottom end of the connecting seat is connected to an adjusting orifice plate covering the through hole for adjusting the water output.

[0008] Furthermore, a buffer block is provided in the buffer cylinder for vertical limiting sliding, and is in contact with the buffer head. A buffer spring is provided between the buffer block and the connecting seat.

[0009] Furthermore, a head is connected to the top of the cylinder, and a first eccentric hole is opened in the head. A pipe seat is rotatably sealed in the first eccentric hole, and a second eccentric hole is opened in the pipe seat. The eccentricity of the first eccentric hole is the same as the eccentricity of the second eccentric hole. A fixing ring is coaxially connected to the top of the head, and the fixing ring is threadedly connected to the pipe seat.

[0010] Preferably, the head is connected to the cylinder through first bolts evenly arranged circumferentially, and the fixing ring is connected to the head through second bolts evenly arranged circumferentially, and the first bolts and the second bolts are correspondingly arranged in the radial direction.

[0011] Preferably, a gasket is placed on the top of the guide cylinder, and a compression spring is provided between the gasket and the head.

[0012] Preferably, key slots are provided on the inner wall of the cylinder and the outer wall of the guide cylinder, and the cylinder and the guide cylinder are butted together through the key slots and then a key block is inserted to lock them.

[0013] Furthermore, a plurality of vertically arranged guide rails are evenly arranged on the inner wall of the guide cylinder, and the counterweight assembly includes a guide plate that is movably engaged with the guide rails.

[0014] Preferably, the guide rail is a detachably connected metal strip.

[0015] The present invention has at least the following advantages and beneficial effects:

[0016] (1) By adding or removing the counterweight blocks, the overall counterweight can be roughly adjusted, and by disassembling and assembling screws of different specifications, the counterweight can be further fine-tuned, so that the load can be continuously and accurately adjusted within a certain range, meeting the test requirements of different drag loads of different types of drive mechanisms; by replacing the adjustment cylinders of different thicknesses, the buffer resistance can be adjusted, so that the buffer resistance of the drive mechanism can be adjusted accurately, meeting the test requirements of different buffer resistances of different types of drive mechanisms, thereby improving the versatility and flexibility of the device.

[0017] (2) By increasing or decreasing the length of the adjusting rod, the stroke can be continuously adjusted with high precision within a certain range.

[0018] (3) By replacing different regulating orifice plates, the hydraulic buffer resistance is adjusted to further meet the test requirements of different buffer resistances of different models of drive mechanisms.

[0019] (4) By screwing the pipe seat, the misalignment of the driving mechanism can be continuously adjusted to meet the different misalignment requirements of different types of driving mechanisms. There is no need to disassemble the connecting bolts, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a multifunctional control rod drive mechanism performance test device provided by the present invention;

[0022] Figure 2 For the present invention Figure 1 A partial enlarged view of point A in the middle;

[0023] Figure 3 A schematic diagram of the structure of a guide cylinder and its interior in a multifunctional control rod drive mechanism performance test device provided by the present invention;

[0024] Figure 4 A schematic structural diagram of a counterweight assembly in a multifunctional control rod drive mechanism performance test device provided by the present invention;

[0025] Figure 5 A schematic structural diagram of a buffer seat in a multifunctional control rod drive mechanism performance test device provided by the present invention;

[0026] Icon: 1-cylinder, 2-guide cylinder, 21-guide rail, 3-counterweight assembly, 31-adjusting rod, 32-connector, 33-counterweight block, 34-screw, 35-threaded hole, 36-buffer head, 37-guide plate, 4-buffer seat, 41-buffer cylinder, 42-connecting seat, 420-through hole, 43-adjusting cylinder, 44-adjusting orifice plate, 45-buffer block, 46-buffer spring, 5-head, 50-first eccentric hole, 51-first bolt, 6-pipe seat, 60-second eccentric hole, 7-fixing ring, 71-second bolt, 81-gasket, 82-compression spring, 90-keyway, 91-key block. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0029] Example

[0030] like Figure 1-5As shown, in this embodiment, a multifunctional control rod drive mechanism performance test device is mainly disclosed, which solves the problem that the current test device has a single capacity and cannot meet the test requirements of multiple working conditions and multiple test conditions of different models of drive mechanisms. It includes a cylinder 1, a guide cylinder 2 is coaxially arranged inside the cylinder 1, and a counterweight assembly 3 is vertically slidably connected inside the guide cylinder 2. The counterweight assembly 3 includes an adjusting rod 31, a counterweight block 33 is connected to the adjusting rod 31, and a plurality of threaded holes 35 are opened on the counterweight block 33 for matching and connecting screws 34 of different specifications. A buffer head 36 is provided at the bottom of the counterweight assembly 3, and a buffer seat 4 that matches the buffer head 36 is connected to the bottom of the guide cylinder 2. The buffer seat 4 includes a buffer cylinder 41 and a connecting seat 42. An adjusting cylinder 43 for adjusting the gap between the buffer head 36 and the buffer cylinder 41 is fitted on the inner wall of the buffer cylinder 41, and the connecting seat 42 is connected to the bottom of the guide cylinder 2; specifically, the top of the adjusting rod 31 is detachably connected to the joint 32, which can be connected to the drive rod of the existing control rod drive mechanism by clamping; the counterweight block 33 is independently arranged and can be covered with a sleeve On the adjusting rod 31, the counterweight block 33 and the screw 34 can be divided into reasonable weight gradients according to the test counterweight requirements. By adding or removing the counterweight block 33, the overall counterweight can be roughly adjusted. By disassembling and assembling the screws 34 of different specifications, the counterweight can be further fine-tuned, so that the load can be continuously adjusted with high precision within a certain range. The installation of the screw 34 should avoid scratching the inner wall of the guide cylinder 2. Therefore, the screw 34 and the threaded hole 35 are preferably countersunk screws 34 and countersunk threaded holes 35. The buffer cylinder 41 is set at the center of the connecting seat 42. The inner cavity is a cavity that is larger at the top and smaller at the bottom, and the upper part is set as a trumpet mouth, which is convenient for the buffer head 36 to fall into the buffer cylinder 41 smoothly; the adjusting cylinder 43 is a cylindrical structure that can be replaced with various thicknesses, and is tightly fixed to the inner wall of the buffer cylinder 41. By replacing the adjusting cylinders 43 with different thicknesses, the buffer resistance is adjusted, the gap between the buffer head 36 and the inner wall of the adjusting cylinder 43 increases, and the buffer resistance decreases. Conversely, the gap decreases and the buffer resistance increases, thereby realizing high-precision control of the buffer resistance to meet the test requirements of different buffer resistances of different models of drive mechanisms.

[0031] Furthermore, in a specific implementation, the above-mentioned adjusting rod 31 provided in the embodiment of the present invention is configured to be detachably connected in multiple sections. Specifically, the multiple sections of the adjusting rod 31 can be connected by threads, and the length of the adjusting rod 31 can be changed by increasing or decreasing the length thereof, thereby achieving continuous high-precision adjustment of the stroke within a certain range.

[0032] Furthermore, in a specific implementation, the above-mentioned connecting seat 42 provided in the embodiment of the present invention is provided with a through hole 420 that is connected to the inner cavity of the buffer cylinder 41, and the bottom end of the connecting seat 42 is connected to an adjusting orifice plate 44 covering the through hole 420 for adjusting the water output; it should be noted that the inner cavity of the buffer cylinder 41 is filled with a pressure-bearing medium, and the pressure-bearing medium is usually deionized water, simulating the working condition of a cold water circuit. The through hole 420 is vertically opened at the center position of the connecting seat 42, and the adjusting orifice plate 44 can be a plurality of replaceable plates with through holes 420 of different sizes or different numbers of through holes 420, and is connected to the bottom of the connecting seat 42 by bolts. By replacing different adjusting orifice plates 44, the hydraulic buffering resistance can be adjusted. The larger the size of the through hole 420 or the more the number of through holes 420, the smaller the buffering resistance. Conversely, the smaller the size of the through hole 420 or the fewer the number of through holes 420, the greater the buffering resistance, thereby meeting the test requirements of different buffering resistances of different models of driving mechanisms.

[0033] Furthermore, in a specific implementation, a buffer block 45 is vertically limited and slidably provided in the buffer cylinder 41 provided in an embodiment of the present invention, and is in contact with the buffer head 36. A buffer spring 46 is provided between the buffer block 45 and the connecting seat 42, which is used to simulate part of the mechanical buffer resistance when the control rod falls, absorb and buffer the impact to a certain extent, protect the buffer seat 4 and improve the stability and accuracy of the test.

[0034] Furthermore, in a specific implementation, a head 5 is connected to the top of the cylinder 1 provided in an embodiment of the present invention, and the head 5 is provided with a first eccentric hole 50, and a pipe seat 6 is rotatably sealed in the first eccentric hole 50, and a second eccentric hole 60 is provided in the pipe seat 6, and the eccentricity of the first eccentric hole 50 is the same as the eccentricity of the second eccentric hole 60, and a fixing ring 7 is coaxially connected to the top of the head 5, and the fixing ring 7 is threadedly connected to the pipe seat 6; specifically, the head 5 can adopt a circular flat flange structure with a first eccentric hole 50 in the middle, and the pipe seat 6 includes a plug-in section whose lower part is rotatably plugged into the head 5 and a middle part thereof is threadedly connected to the fixing ring 7 The threaded section, the plug-in section and the threaded section are arranged coaxially. The eccentricity of the first eccentric hole 50 and the second eccentric hole 60 is both a. The value of a is designed according to half of the maximum eccentricity required by the test. After installation, the head 5 and the fixing ring 7 are fixed. By screwing the pipe seat 6 clockwise or counterclockwise, the eccentricity can be continuously adjusted within the range of 0-2a. When the eccentric direction of the first eccentric hole 50 is the same as the eccentric direction of the second eccentric hole 60, the misalignment value is 2a. When the eccentric direction of the first eccentric hole 50 is opposite to the eccentric direction of the second eccentric hole 60, the misalignment value is 0. There is no need to disassemble the connecting bolts, which is convenient for operation.

[0035] Preferably, the head 5 is connected to the cylinder 1 through first bolts 51 evenly arranged circumferentially, and the fixing ring 7 is connected to the head 5 through second bolts 71 evenly arranged circumferentially, and the first bolts 51 and the second bolts 71 are arranged correspondingly in the radial direction; specifically, the head 5 is connected to the flange connected to the top of the cylinder 1 through the first bolts 51, the evenly distributed first bolts 51 are arranged in alignment with the center line of the head 5, and the evenly distributed second bolts 71 are arranged in alignment with the center line of the fixing ring 7, which ensures the tightness and uniform force of the head 5 and the fixing ring 7, avoids the problem of excessive local force, and improves the durability and safety of the device.

[0036] Preferably, a gasket 81 is placed on the top of the guide cylinder 2 , and a compression spring 82 is provided between the gasket 81 and the head 5 to fix the axial position of the guide cylinder 2 and ensure the stability of the guide cylinder 2 .

[0037] Preferably, key grooves 90 are provided on the inner wall of the cylinder 1 and the outer wall of the guide cylinder 2, and the cylinder 1 and the guide cylinder 2 are locked by inserting a key block 91 after being mated with the key grooves 90; through this mating locking mechanism, the connection between the cylinder 1 and the guide cylinder 2 is made stronger, the relative movement between the components is reduced, the radial fixation of the guide cylinder 2 is achieved, and the stability of the device is improved.

[0038] Furthermore, in a specific implementation, a number of vertically arranged guide rails 21 are evenly arranged on the inner wall of the guide cylinder 2 provided in the embodiment of the present invention, and the counterweight assembly 3 includes a guide plate 37 that is movably engaged with the guide rails 21; specifically, the guide rails 21 are detachably connected metal strips that are resistant to high temperatures, wear-resistant, and not easily deformed, and are easy to replace and maintain, thereby extending the service life of the device; it should be noted that guide grooves corresponding to the number of guide rails 21 are provided on the guide plate 37, and there is a certain matching gap between the guide grooves and the guide rails 21.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A multifunctional control rod drive mechanism performance test device, characterized in that: The invention comprises a cylinder (1), wherein a guide cylinder (2) is coaxially arranged inside the cylinder (1), a counterweight assembly (3) is vertically slidably connected inside the guide cylinder (2), the counterweight assembly (3) comprises an adjusting rod (31), a counterweight block (33) is connected to the adjusting rod (31), a plurality of threaded holes (35) for matching and connecting screws (34) of different specifications are provided on the counterweight block (33), a buffer head (36) is provided at the bottom of the counterweight assembly (3), a buffer seat (4) matched with the buffer head (36) is connected to the bottom of the guide cylinder (2), the buffer seat (4) comprises a buffer cylinder (41) and a connecting seat (42), an adjusting cylinder (43) for adjusting the gap between the buffer head (36) and the buffer cylinder (41) is fitted on the inner wall of the buffer cylinder (41), and the connecting seat (42) is connected to the bottom of the guide cylinder (2).

2. A multifunctional control rod drive mechanism performance test device according to claim 1, characterized in that: The adjusting rod (31) is provided with multiple sections that can be detachably connected.

3. The multifunctional control rod drive mechanism performance test device according to claim 1, characterized in that: The connecting seat (42) is provided with a through hole (420) communicating with the inner cavity of the buffer cylinder (41), and the bottom end of the connecting seat (42) is connected to an adjusting orifice plate (44) covering the through hole (420) for adjusting the water output.

4. The multifunctional control rod drive mechanism performance test device according to claim 1, characterized in that: A buffer block (45) is vertically limited and slidably provided in the buffer cylinder (41) and abuts against the buffer head (36). A buffer spring (46) is provided between the buffer block (45) and the connecting seat (42).

5. The multifunctional control rod drive mechanism performance test device according to claim 1, characterized in that: The top of the cylinder (1) is connected to a head (5), the head (5) is provided with a first eccentric hole (50), a tube seat (6) is rotatably sealed in the first eccentric hole (50), a second eccentric hole (60) is provided in the tube seat (6), the eccentricity of the first eccentric hole (50) is the same as the eccentricity of the second eccentric hole (60), a fixing ring (7) is coaxially connected to the top of the head (5), and the fixing ring (7) is threadedly connected to the tube seat (6).

6. The multifunctional control rod drive mechanism performance test device according to claim 5, characterized in that: The head (5) is connected to the cylinder (1) via first bolts (51) evenly arranged in the circumferential direction, and the fixing ring (7) is connected to the head (5) via second bolts (71) evenly arranged in the circumferential direction, wherein the first bolts (51) and the second bolts (71) are arranged correspondingly in the radial direction.

7. The multifunctional control rod drive mechanism performance test device according to claim 5, characterized in that: A gasket (81) is placed on the top end of the guide cylinder (2), and a compression spring (82) is provided between the gasket (81) and the sealing head (5).

8. The multifunctional control rod drive mechanism performance test device according to claim 5, characterized in that: Key grooves (90) are provided on the inner wall of the cylinder (1) and the outer wall of the guide cylinder (2), and the cylinder (1) and the guide cylinder (2) are locked by inserting a key block (91) after being docked through the key grooves (90).

9. The multifunctional control rod drive mechanism performance test device according to claim 1, characterized in that: The inner wall of the guide cylinder (2) is evenly provided with a plurality of vertically arranged guide rails (21), and the counterweight assembly (3) includes a guide plate (37) that is movably engaged with the guide rails (21).

10. The multifunctional control rod drive mechanism performance test device according to claim 9, characterized in that: The guide rail (21) is a detachably connected metal strip.

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