Multifunctional control rod driving mechanism performance test device

Abstract

The invention relates to the technical field of nuclear reactors, and provides a multifunctional control rod driving mechanism performance test device which comprises a cylinder, a guide cylinder, a counterweight assembly and a buffer seat, through mutual cooperation of a pipe seat, a fixing ring and an end socket, the test error centering amount of a driving mechanism is adjustable, the different error centering amount requirements of different types of driving mechanisms are met, and the test efficiency is improved. Through the mutual cooperation of the counterweight rod, the counterweight block and the screw, the operation stroke and the dragging load of the driving mechanism are adjustable, the test requirements of different operation strokes and different dragging loads of different types of driving mechanisms are met, and through the mutual cooperation of the adjusting pore plate and the adjusting cylinder, the high-precision adjustment of the buffer resistance of the driving mechanism is realized. The test requirements of different buffer resistances of different types of driving mechanisms are met, the test requirements of multiple working conditions and multiple test conditions of different types of driving mechanisms are met, and the universality and flexibility of the device are improved.

Description

Technical Field

[0001] The 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] There are multiple control rod drive mechanisms in the reactor. Each control rod drive mechanism is installed in the corresponding tube seat sealing shell on the pressure vessel head, driving the control rods to move in the reactor at a certain speed, thereby adjusting the reactivity of the core and realizing the start-up, power regulation, power compensation and shutdown of the reactor. Under reactor accident conditions, after the control rod drive mechanism is powered off, the control rods can be quickly inserted into the core within the specified time by their own weight to ensure the emergency shutdown of the reactor. At the same time, the impact caused by the rapid fall of the control rods will not cause damage to the reactor. Therefore, as the execution unit of the reactor control and nuclear safety protection system, the rationality of the design of the control rod drive mechanism is directly related to the inherent safety and operational stability of the nuclear reactor. In order to ensure that the basic functions and performance indicators of the control rod drive mechanism meet the design requirements, a series of cold and hot performance and assessment tests are required.

[0003] In the past, due to the small number of control rod drive mechanism models and relatively simple test conditions, the test device only needed to meet one or two conditions or conditions. However, with the iterative development of nuclear reactors, the original control rod drive mechanism model structure has been continuously optimized, resulting in the existing test device being unable to meet the increasingly complex test requirements of the new control rod drive mechanism model. 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 scheme: 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 inside 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 configured as a plurality of detachably connected sections.

[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 and used for adjusting the water output.

[0008] Furthermore, a buffer block abutting against the buffer head is vertically limited and slidably arranged in the buffer cylinder, and a buffer spring is arranged 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 body 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 arranged between the gasket and the head.

[0012] Preferably, key grooves 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 grooves and then key blocks are inserted and locked.

[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 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 adjusted with high precision within a certain range to meet the test requirements of different drag loads of different types of drive mechanisms; by replacing the adjustment cylinders of different thicknesses and adjusting the buffer resistance, the buffer resistance of the drive mechanism can be adjusted with high precision to meet 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 adjusted continuously and with high precision within a certain range.

[0018] (3) By replacing different adjustment 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 drive mechanism test can be continuously adjusted to meet the different misalignment requirements of different types of drive 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 drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without 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 the middle A;

[0023] Figure 3 A schematic diagram of the structure of a guide tube 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 diagram of the structure of a buffer seat in a multifunctional control rod drive mechanism performance test device provided by the present invention;

[0026] Icons: 1-cylinder, 2-guide cylinder, 21-guide rail, 3-counterweight assembly, 31-adjusting rod, 32-joint, 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-end 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] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 here 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are 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 types 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 for matching and connecting screws 34 of different specifications are opened on the counterweight block 33. A buffer head 36 is provided at the bottom of the counterweight assembly 3, and a buffer seat 4 matched with 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, a joint 32 is detachably connected to the top of the adjusting rod 31, and 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 weight block 33 and the screw 34 can be divided into reasonable weight gradients according to the test weight requirement. The overall weight can be roughly adjusted by adding or removing the weight block 33, and the weight can be further fine-tuned by disassembling and assembling screws 34 of different specifications, 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, so that the buffer head 36 can fall into the buffer cylinder 41 smoothly; the adjusting cylinder 43 is a cylindrical structure with replaceable thicknesses, which 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 types 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 number of adjusting rods 31, 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 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 the through holes 420, the smaller the buffering resistance. Conversely, the smaller the size of the through hole 420 or the fewer the number of the 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 abutting against the buffer head 36 is vertically limited and slidably arranged in the buffer cylinder 41 provided in the embodiment of the present invention, and a buffer spring 46 is arranged 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, and protect the buffer seat 4 to improve the stability and accuracy of the test.

[0034] Further, in a specific implementation, a head 5 is connected to the top of the cylinder 1 provided in the embodiment of the present invention, and the head 5 is provided with a first eccentric hole 50, and a pipe seat 6 is rotatably and sealably connected 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 with the head 5 and a middle part thereof is threadedly connected with 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 are both a, and 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, and the eccentricity can be continuously adjusted within the range of 0-2a by screwing the pipe seat 6 clockwise or counterclockwise. 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 easy to operate.

[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 radially correspondingly; 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 tube 2 , and a compression spring 82 is provided between the gasket 81 and the head 5 to fix the axial position of the guide tube 2 and ensure the stability of the guide tube 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 more secure, 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 plurality 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, and deformation, 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 only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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) matching 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 as claimed in claim 1, characterized in that: The adjusting rod (31) is configured as a plurality of detachably connected sections.

3. A multifunctional control rod drive mechanism performance test device as claimed in claim 1, characterized in that: The connection 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 connection seat (42) is connected to an adjusting orifice plate (44) covering the through hole (420) and used for adjusting the water output.

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

5. A multifunctional control rod drive mechanism performance test device as claimed in claim 1, characterized in that: The top of the cylinder (1) is connected to a sealing head (5), the sealing 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 sealing head (5), and the fixing ring (7) is threadedly connected to the tube seat (6).

6. A multifunctional control rod drive mechanism performance test device as claimed in claim 5, characterized in that: The end cap (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 end cap (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. A multifunctional control rod drive mechanism performance test device as claimed in 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 arranged between the gasket (81) and the sealing head (5).

8. A multifunctional control rod drive mechanism performance test device as claimed in 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 butt-jointed through the key grooves (90) and then locked by inserting a key block (91).

9. A multifunctional control rod drive mechanism performance test device as claimed in 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) comprises a guide plate (37) that is movably engaged with the guide rails (21).

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

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