A helium leak detection and positioning device for high temperature reactor heat transfer tubes

Abstract

The present invention discloses a helium leak detection and positioning device for a high-temperature reactor heat transfer tube, comprising a flange fixing plate, a front end support, a rotating assembly, a linear assembly, a suction gun assembly and a main guide rail, wherein the two ends of the main guide rail are respectively connected to the flange fixing plate and the front end support, the front end support is provided with a rotating assembly, the rotating assembly is connected to the linear assembly, and the suction gun assembly is provided on the linear assembly. The beneficial effect of the present invention is that it can solve the inspection coverage problem caused by the small mouth and large cavity on the steam outlet side. The influence of the throttling resistance part is avoided. The overall fixation of the device is achieved through the water inlet side port, the flange fixing plate is fixed to the main steam outlet end by bolts through the flange bolt fixing hole, and the flange fixing plate is installed at both ends of the main guide rail to play a supporting role. The middle rod realizes the centering adjustment of the axis of the water inlet measuring cylinder through the support legs.

Description

Technical Field

[0001] The invention belongs to the field of nondestructive testing and maintenance of heat transfer tubes of steam generators and similar heat exchange equipment, and in particular relates to a helium leak detection and positioning device for heat transfer tubes of high-temperature reactors. Background Art

[0002] High temperature gas-cooled reactor is an advanced unit independently developed by my country using a new generation of nuclear power technology. The inspection technology and equipment for the heat transfer tubes of steam generators are the direction that needs to be vigorously developed in the future. Since its steam generator is completely different from conventional pressurized water reactors, its operating environment, structure, especially the tube sheet structure are different. At present, there is no corresponding inspection technology and special inspection equipment. The structure of the heat transfer tube of the steam generator of the high temperature gas-cooled reactor is also different from that of the conventional pressurized water reactor. It is a spiral coil with a small bending radius. It cannot be inspected using the conventional eddy current inspection method for heat transfer tubes. A more feasible inspection method is to implement helium mass spectrometry inspection. The steam generator heat transfer tube automatic inspection device carries the helium inspection suction gun device according to the planned path, connects the suction gun and the heat transfer tube, and maintains the sealing, pumps helium to the helium mass spectrometer leak detector, analyzes the extracted helium concentration, and thus checks whether there is a leak in the heat transfer tube.

[0003] Since the throttling assembly is installed at the water inlet of the steam generator of the high temperature gas-cooled reactor, there is a gap between the throttling assembly and the anti-loosening clamp ring, and no seal is formed. The inner diameter of the throttling assembly has various specifications, and the outer diameter is an irregular structure, which leads to the inspection on this side, requiring the positioning device to have high positioning accuracy and a series of sealing devices to be added. The motion function, mechanism and control system are complex.

[0004] The existing inspection method of the heat transfer tube on the water inlet side is difficult to inspect due to the complex disassembly of the pipe and the existence of throttling resistance parts. It requires the positioning device to have high positioning accuracy and a series of sealing devices to be added. The motion function, mechanism and control system are complex.

[0005] In order to solve the problem of helium mass spectrometer leak detection in high temperature gas-cooled reactors, avoid the influence of throttling resistance parts at the main water supply inlet, simplify the complexity of the inspection equipment, and increase the reliability of the inspection equipment, it is necessary to have a positioning device at the main steam outlet end to realize helium leak detection of the heat transfer tube of the steam generator of the high temperature gas-cooled reactor. Summary of the invention

[0006] The object of the present invention is to provide a high temperature reactor heat transfer tube helium leak detection positioning device, which can realize the helium leak detection work of the heat transfer tube of the high temperature gas-cooled reactor steam generator at the positioning device at the main steam outlet end.

[0007] The technical solution of the present invention is as follows: A helium leak detection and positioning device for a high-temperature reactor heat transfer tube comprises a flange fixing plate, a front end support, a rotating assembly, a linear assembly, a suction gun assembly and a main guide rail, wherein the two ends of the main guide rail are respectively connected to the flange fixing plate and the front end support, a rotating assembly is arranged on the front end support, the rotating assembly is connected to the linear assembly, and the suction gun assembly is arranged on the linear assembly.

[0008] The flange fixing plate, the flange bolt fixing hole and the main steam outlet end are fixed together by bolts, and the flange fixing plate is installed at both ends of the main rail.

[0009] Reinforcing ribs are installed on the main rail.

[0010] The main guide rail is provided with a dovetail groove structure, and the bracket transports the positioning assembly to the front end of the guide rail through the dovetail groove, and locks the positioning assembly through a pneumatic quick locker.

[0011] The rotating assembly is installed on a bracket, and the bracket is installed on the main rail.

[0012] The rotating assembly includes a rotating motor, a reducer and a rotating shaft. The rotating motor is installed on a bracket and connected to the reducer to drive the reducer to rotate. The reducer is connected to the rotating shaft. The rotating shaft is connected to the linear assembly to drive the linear assembly to rotate. The linear assembly includes a linear guide and a slider. A lead screw arranged inside the linear guide cooperates with the rotating shaft. One end of the linear guide is connected to the slider. Driven by the rotating motor, the linear guide performs a linear motion through the lead screw on the linear guide, driving the suction gun assembly on the slider to rotate.

[0013] The suction gun assembly comprises a suction gun sealing head, a cylinder and a piston rod, one end of the cylinder is connected to the slider, the other end of the cylinder cooperates with the piston rod, and the piston rod is connected to the suction gun sealing head.

[0014] The support assembly comprises a bracket, a support seat, a leg cylinder, a leg piston rod and a leg pad. The bracket is installed on the main rail, the support seat is installed on the top, and the support seat and the rotating shaft are connected through a bearing.

[0015] The beneficial effect of the present invention is that it can solve the inspection coverage problem caused by the small mouth and large cavity on the steam outlet side. It avoids the influence of the throttling resistance. The overall fixation of the device is achieved through the water inlet port, and the flange fixing plate is fixed to the main steam outlet end through the flange bolt fixing hole by bolts. The flange fixing plate is installed at both ends of the main rail to play a supporting role. The middle rod realizes the centering adjustment of the axis of the water inlet measuring cylinder through the support legs. The suction gun with a rotating action at the front section uses the pneumatic pre-tightening function to enable the sealing ring at the head of the suction gun sealing head to achieve the sealing effect of the heat transfer pipe mouth. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the working of a helium leak detection and positioning device for a high temperature reactor heat transfer tube provided by the present invention;

[0017] Figure 2 A schematic diagram of a helium leak detection and positioning device for a high-temperature reactor heat transfer tube provided by the present invention;

[0018] Figure 3 It is a schematic diagram of the positioning structure;

[0019] Figure 4 This is a schematic diagram of the suction gun structure;

[0020] Figure 5 It is a schematic diagram of the supporting structure;

[0021] Figure 6 The dovetail groove diagram of the main rail is shown in Figure 2.

[0022] In the figure, 1 is the main steam outlet end, 2 is the flange fixing plate, 3 is the flange bolt fixing hole, 4 is the positioning device, 5 is the front end support, 6 is the rotating assembly, 7 is the linear assembly, 8 is the suction gun assembly, 9 is the main rail, 10 is the reinforcing rib, 11 is the front end support, 12 is the rotating motor, 13 is the reducer, 14 is the supporting seat, 15 is the rotating shaft, 16 is the bracket, 17 is the suction gun sealing head, 18 is the linear guide rail, 19 is the slider, 20 is the cylinder, 21 is the piston rod, 22 is the outrigger piston rod, 23 is the outrigger pad, and 24 is the dovetail groove. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 2 As shown, a helium leak detection and positioning device for a high-temperature reactor heat transfer tube includes a flange fixing plate 2, a front end support member 5, a rotating assembly 6, a linear assembly 7, a suction gun assembly 8 and a main guide rail 9, wherein the two ends of the main guide rail 9 are respectively connected to the flange fixing plate 2 and the front end support member 5, the front end support member 5 is provided with a rotating assembly 6, the rotating assembly 6 is connected to the linear assembly 7, and the linear assembly 7 is provided with a suction gun assembly 8.

[0025] like Figure 1 As shown, the flange fixing plate 2 is fixed to the main steam outlet end 1 by bolts through the flange bolt fixing hole 3. The flange fixing plate 2 is installed at both ends of the main guide rail 9 to play a supporting role. Since the main guide rail 9 is relatively long, the main guide rail 9 is installed with reinforcing ribs 10 to avoid the accuracy problem caused by deformation. The main guide rail 9 is installed with a dovetail groove 24 structure, which allows the bracket 16 to transport the positioning assembly to the front end of the guide rail through the dovetail groove 24, and lock the positioning assembly through the pneumatic quick locker, so that it does not move during the helium leak detection operation. The positioning assembly can be pushed and retracted by a long rod manually or a linear motor.

[0026] like Figure 3 As shown, the rotating assembly 6 is mounted on a bracket 16, and the bracket 16 is mounted on the main rail. The rotating assembly 6 includes a rotating motor 12, a reducer 13 and a rotating shaft 15. The rotating motor 12 is mounted on the bracket 16 and connected to the reducer 13, thereby driving the reducer 13 to rotate. The reducer 13 is connected to the rotating shaft 15, and the rotating shaft 15 is connected to the linear assembly 7, driving the linear assembly 7 to rotate. The linear assembly 7 includes a linear guide 18 and a slider 19. The lead screw arranged inside the linear guide 18 cooperates with the rotating shaft 15. One end of the linear guide 18 is connected to the slider 19. Driven by the rotating motor 12, the linear guide 18 is linearly moved through the lead screw on the linear guide 18. The suction gun assembly 8 on the slider 19 is driven to rotate. The suction gun assembly 8 includes a suction gun sealing head 17, a cylinder 20 and a piston rod 21. One end of the cylinder 20 is connected to the slider 19, and the other end of the cylinder 20 cooperates with the piston rod 21. The piston rod 21 is connected to the suction gun sealing head 17. The cylinder 20 and the piston rod 21 can align the two holes of the suction gun sealing head 17 with the heat transfer pipe orifice, and the sealing ring at the head of the suction gun sealing head 17 can achieve the sealing effect of the heat transfer pipe orifice through the pneumatic pre-tightening function. The suction gun assembly 8 can also improve the inspection efficiency by adding its own rotation function.

[0027] The support assembly includes a bracket 16, a support seat 14, a leg cylinder 21, a leg piston rod 22, a leg pad 23 and other components. The bracket 16 is installed on the main rail 9, and the support seat 14 is installed on the top. The support seat 14 and the rotating shaft 15 are connected through a bearing, which will not affect the rotation function of the rotating assembly. The leg cylinder 21 is installed on the support seat 14, and the leg piston rod 22 can be driven by compressed gas to extend the three groups of legs, and the length of the leg extension can be adjusted, so that the entire positioning device is in a horizontal state. The leg pad 23 at the end of the leg piston rod 22 is made of a material with a lower hardness to avoid scratching the inner wall of the main steam outlet end 1.

[0028] according to Figure 1 The positioning device 4 shown is mainly composed of a flange fixing plate 2, a front support 5, a rotating assembly 6, a linear assembly 7, a suction gun assembly 8, a main guide rail 9, etc. When in use, first put the main guide rail into the main steam outlet end, and fix the flange fixing plate 2 and the flange of the main steam outlet end 1 together through the flange bolts of the flange fixing plate 2, and then adjust the extension length of the support assembly, and adjust the extension length of the legs through the proportional servo valve, etc., so that the entire main guide rail remains horizontal. A dovetail groove 24 structure is installed on the main guide rail 9, and the bracket of the positioning assembly is installed in the dovetail groove. The positioning assembly is pushed to the front end of the guide rail by a long rod manually or a linear motor, and the positioning assembly is locked by a pneumatic quick locker so that it does not move during the helium leak detection operation.

[0029] After the positioning assembly moves to the predetermined position, the upper computer calculates the optimal path of the next heat transfer tube to be inspected according to the current position of the current suction gun device, and the positioning assembly transports the suction gun assembly to the position. Then the suction gun device is driven to rotate by the suction gun rotating motor so that the two suction gun tubes of the suction gun device are aligned with the two corresponding throttling resistance parts of the upper water supply chamber. At this time, the machine vision function of the camera on the suction gun assembly is used to calculate whether the suction gun tubes are completely aligned. If there is a deviation, the rotation action of the positioner and the suction gun device is linked to adjust until they are completely aligned. Then the suction gun device is driven to stick to the pipe mouth of the heat transfer tube by the cylinder of the suction gun assembly. The positive pressure of the suction gun on the tube sheet is provided by a certain pneumatic margin to improve the sealing of the suction gun port and the throttling assembly, and then helium is sucked into the helium leak detector through the air pipe connected by the pneumatic joint to perform the helium leak detection operation. Repeat the above steps in sequence to complete the helium leak detection of all heat transfer tubes. After completing the helium leak detection, the entire positioning device can be removed from the main steam outlet end 1 by the reverse installation steps.

Claims

1. A helium leak detection and positioning device for a high temperature reactor heat transfer tube, characterized in that: It includes a flange fixing plate, a front end support, a rotating assembly, a linear assembly, a suction gun assembly and a main rail, wherein the two ends of the main rail are respectively connected to the flange fixing plate and the front end support, the front end support is provided with a rotating assembly, the rotating assembly is connected to the linear assembly, and the suction gun assembly is provided on the linear assembly; The flange fixing plate, flange bolt fixing hole and main steam outlet are fixed together by bolts, and the flange fixing plate and bracket are installed at both ends of the main rail; The main guide rail is provided with a dovetail groove structure, and the bracket transports the positioning assembly to the front end of the guide rail through the dovetail groove, and locks the positioning assembly through a pneumatic quick locker; The rotating assembly is mounted on a bracket, and the bracket is mounted on the main rail; The rotating assembly includes a rotating motor, a speed reducer and a rotating shaft. The rotating motor is mounted on a bracket and connected to the speed reducer to drive the speed reducer to rotate. The speed reducer is connected to the rotating shaft. The rotating shaft is connected to the linear assembly to drive the linear assembly to rotate. The linear assembly includes a linear guide and a slider. A lead screw arranged inside the linear guide cooperates with the rotating shaft. One end of the linear guide is connected to the slider. Driven by the rotating motor, the linear guide performs a linear motion through the lead screw on the linear guide to drive the suction gun assembly on the slider to perform a rotating motion. The suction gun assembly comprises a suction gun sealing head, a cylinder and a piston rod, one end of the cylinder is connected to the slider, the other end of the cylinder cooperates with the piston rod, and the piston rod is connected to the suction gun sealing head; The front end support member includes a bracket, a support seat, an outrigger cylinder, an outrigger piston rod and an outrigger pad. The bracket is installed on the main rail, the support seat is installed on the top of the bracket, and the support seat and the rotating shaft are connected through a bearing.

2. A helium leak detection and positioning device for a high temperature reactor heat transfer tube as claimed in claim 1, characterized in that: Reinforcing ribs are installed on the main rail.

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