CN212586109U

CN212586109U - Creep irradiation device suitable for stress static loading

Info

Publication number: CN212586109U
Application number: CN202021627125.4U
Authority: CN
Inventors: 米向秒; 王冠博; 郭斯茂; 刘晓; 钱达志; 唐彬
Original assignee: Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics
Current assignee: Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-02-23
Anticipated expiration: 2030-08-07

Abstract

The utility model discloses a creep irradiation device suitable for stress static loading, which comprises an upper shell, a lower shell, a thread type power transmission mechanism and a displacement rod which are arranged in the upper shell, a force measuring component arranged in the lower shell, a movable sample frame I, a movable sample frame II and a fixed sample frame; the utility model is suitable for a static loaded creep irradiation device of stress need not the connecting tube outside the heap of research, has avoided the research in-pile cooling water to the impact of pipeline and influence whole device stability. Utilize the utility model discloses a static loading creep irradiation device of stress when realizing test environment such as test sample stress, temperature, neutron loading simultaneously, device compact structure need not to draw forth pipeline to the reactor outside, has improved experimental reliability and security.

Description

Creep irradiation device suitable for stress static loading

Technical Field

The utility model belongs to nuclear power material, concretely relates to creep irradiation device suitable for stress static loading.

Background

The nuclear power material technology is one of the most key technologies for supporting nuclear power development all the time, and meanwhile, the material problem is one of the bottlenecks for restricting the rapid development of the nuclear power technology. The fuel envelope, which serves as a first barrier to contain the radioactive material, is a critical component for maintaining the structural integrity of the fuel element and preventing leakage of the radioactive material. Fuel cladding is required to withstand the coupling effects of high temperature, stress and intense radiation over a long period of time during service in a nuclear power plant reactor, the length of which changes over time, i.e. "creep". Creep not only causes deformation of the cladding material, but also damage, rupture effects, which may cause the fuel element cladding to fail to perform its intended design function during service, and even cause leakage of radioactive materials. With the deepening of nuclear power autonomous work in China, the creep effect of a fuel element in a high-temperature and stress irradiation environment needs to be deeply researched, and the work is developed, so that the technical problem of loading of various test environments of high temperature, stress and neutrons is solved firstly.

At present, a common method is a test environment independent loading technology, namely, a high-temperature and stress irradiation environment is constructed outside a research reactor, a fuel cladding material sample is checked, after a preset time is reached, the cladding sample is placed in a neutron field of the research reactor, and is taken out after a preset irradiation dose is reached, so that a test is completed. However, the independent loading technology of the test environment cannot restore the real service environment of the sample, and the equivalence of the test result and the creep behavior of the fuel cladding during service cannot be effectively explained at present.

In addition, creep research is carried out through a multiple test environment synchronous loading technology in the field, mainly a creep irradiation device with an online air pressure adjusting function is placed in a research reactor, target stress is obtained through adjusting air pressure, and the multiple test environment synchronous loading of the sample is achieved through the measures. The existing multiple test environment in-situ loading device for regulating the pressure of the instrument needs to connect a plurality of pipelines to the outside of the research pile, so that additional requirements are provided for the installation of the test device in the research pile, the technical difficulty is increased, and the device is not suitable for part of research piles.

Disclosure of Invention

In view of this, the utility model provides a creep irradiation device suitable for stress static loading.

A creep irradiation device suitable for stress static loading is characterized by comprising an upper shell, a lower shell, a thread type power transmission mechanism and a displacement rod which are arranged in the upper shell, a force measuring component arranged in the lower shell, a movable sample rack I, a movable sample rack II and a fixed sample rack; wherein, the upper shell and the lower shell are connected in a sealing way; the screw thread type power transmission mechanism is connected with a displacement rod through a turning connector, the displacement rod penetrates through a sealing disc at the top of the lower shell and is connected with a movable sample rack I through a force measuring component, and the movable sample rack I is connected with a movable sample rack II through a connecting rod group; the fixed sample rack is positioned between the movable sample rack I and the movable sample rack II and is fixedly connected with the lower shell; wherein the sealing disc is connected to the lower shell through a sealing nut; a sealing metal corrugated pipe is sleeved on the displacement rod, one end of the sealing metal corrugated pipe is connected with the displacement rod, and the other end of the sealing metal corrugated pipe is connected to the sealing disc; the outer diameter of the movable sample frame II is tightly matched with the inner diameter of the lower shell.

Further, the thread type power transmission mechanism comprises a transmission rod, a handle detachably arranged on the transmission rod, a sealing filler filled on the upper portion of the upper shell and a filler cover, wherein the filler cover is screwed on the top end of the upper shell, and the transmission rod penetrates through the filler cover and is connected to the turning connector.

Further, the transmission rod is provided with transmission threads, and the transmission threads are trapezoidal threads.

Further, the sealing filler is flexible graphite filler.

Furthermore, the direction-changing connector comprises a steel ball, a pin and a non-return gear, wherein the outer surface of the non-return gear is connected with a transmission rod of the thread type power transmission mechanism, and the inner surface of the non-return gear is connected with the displacement rod through the pin.

Furthermore, the displacement rod comprises a connector, a spring gland and a spring inner rod which are integrally designed.

Further, the force measuring component comprises a compression spring, a spring sleeve, a pressure transmitting sheet and a pressure measuring element, wherein the spring sleeve is fixed on the upper end face of the movable sample frame I, the inner surface of the spring sleeve is in close contact with the peripheral surface of the spring gland, the pressure measuring element, the pressure transmitting sheet and the compression spring are sequentially placed in the spring sleeve, the compression spring is in contact with the lower end face of the spring gland, and the pressure measuring element is in contact with the upper end face of the movable sample frame I.

Furthermore, a waterproof sealing connector is arranged on the upper end face of the lower shell, penetrates through the lower shell and is sealed by brazing; the waterproof sealing connector is electrically connected with the pressure measuring element through a high-temperature-resistant lead.

Furthermore, the connecting rod group comprises a plurality of connecting rods and balance adjusting nuts which are uniformly distributed in the circumferential direction, and each connecting rod penetrates through the movable sample rack I and the movable sample rack II.

Furthermore, the vertical circumference of the sealing metal corrugated pipe is welded to the displacement rod through a welding ring in a sealing mode, a sealing gasket is arranged between the sealing metal corrugated pipe and the sealing disk, and the sealing gasket is located between the upper shell and the lower shell.

The utility model discloses beneficial effect:

(1) the utility model discloses a sealed corrugated metal pipe, sealed dish and gland nut are designed for the internal gas of inferior valve can not reveal outside the sealed corrugated metal pipe. And simultaneously, the utility model discloses adjustable internal diameter of lower casing and the internal sealed gaseous kind of inferior valve have realized the regulation of casing heat preservation effect down promptly to make the test sample temperature accord with the irradiation requirement.

(2) The utility model is suitable for a static loaded creep irradiation device of stress need not the connecting tube outside the heap of research, has avoided the research in-pile cooling water to the impact of pipeline and influence whole device stability.

(3) Utilize the utility model discloses a static loading creep irradiation device of stress when realizing test environment such as test sample stress, temperature, neutron loading simultaneously, device compact structure need not to draw forth pipeline to the reactor outside, has improved experimental reliability and security.

Drawings

FIG. 1 is a schematic view of a stress static loading creep irradiation apparatus according to the present invention;

in the figure, 1, an upper shell 2, a threaded power transmission mechanism 3, a displacement rod 4, a diversion connector 5, a lower shell 6, a sealing disc 7, a force measuring component 8, a movable sample holder I9, a connecting rod group 10, a movable sample holder II 11, a fixed sample holder 12, a sealing metal corrugated pipe 13, a handle 14, a transmission rod 15, a transmission thread 16, a sealing filler 17, a filler gland 18, a steel ball 19, a pin 20, a check stop 21, a connector 22, a spring gland 23, an inner spring rod 24, a compression spring 25, a spring sleeve 26, a pressure transmission sheet 27, a pressure measuring element 28, a waterproof sealing connector 29, a balance adjusting nut 30, a welding ring 31 and a sealing gasket.

Detailed Description

As shown in fig. 1, the creep irradiation device suitable for stress static loading of the present invention comprises an upper casing 1, a lower casing 5, a screw thread type power transmission mechanism 2 and a displacement rod 3 arranged in the upper casing 1, a force measuring component 7 arranged in the lower casing 5, a movable sample holder I8, a movable sample holder II 10 and a fixed sample holder 11; wherein, the upper shell 1 and the lower shell 5 are connected through screw cap sealing or welding sealing. The screw thread type power transmission mechanism 2 is connected with a displacement rod 3 through a direction-changing connector 4, the displacement rod 3 penetrates through a sealing disc 6 at the top of a lower shell 5 and is connected with a movable sample rack I8 through a force measuring component 7, and the movable sample rack I8 is connected with a movable sample rack II 10 through a connecting rod group 9; the fixed sample holder 11 is positioned between the movable sample holder I8 and the movable sample holder II 10 and is fixedly connected with the lower shell 5; wherein said sealing disc 6 is connected to the lower housing by means of a sealing nut; displacement pole 3 on the cover be equipped with sealed corrugated metal pipe 12, sealed corrugated metal pipe 12 one end is connected with displacement pole 3, the other end is connected on sealed dish 6. The sealing metal bellows 12 is used for sealing the insulating gas in the lower housing 5. Wherein, one end of the test sample is fixed on the fixed sample frame 11 by using a pin, and the other end is fixed on the movable sample frame II 10; the outer diameter of the movable sample holder II 10 is tightly matched with the inner diameter of the lower shell 5.

Will the utility model discloses a creep irradiation device arranges research in and piles, through predetermined lower casing inner chamber size and the gas composition in it, can make test sample keep at target temperature state. The utility model discloses a synchronous loading stress, neutron and simulation test environment such as high temperature, the device simple structure extensively are applicable to various heap types.

Further, screw thread formula power transmission mechanism 2 include transfer line 14, detachably set up handle 13 on transfer line 14, pack in sealing filler 16 and gland 17 on last casing upper portion, wherein, gland 17 connects soon in the top of last casing 1, transfer line 14 pass gland 17, be connected to diversion connector 4, the utility model discloses before the irradiation, outside the research heap, the rotation angle of adjusting screw thread formula power transmission mechanism 2 in handle 13 pushes down displacement pole 3 through diversion connector 4, displacement pole 3 drives portable sample frame I8, II 10 and removes, applys tensile stress to the test sample to acquire target stress, after obtaining target stress, will the utility model discloses irradiation device puts into the heap.

Further, the transmission rod 14 is provided with a transmission thread 15, and the transmission thread 15 is a trapezoidal thread to realize power transmission.

Further, the sealing packing 16 is waterproof, and may be, for example, a flexible graphite packing.

Furthermore, the direction-changing connector comprises a steel ball 18, a pin 19 and a non-return stop 20, wherein the outer surface of the non-return stop 20 is connected with the transmission rod 14 of the thread type power transmission mechanism, and the inner surface is connected with the displacement rod 3 through the pin 19. The number of the pins 19 is 2.

Further, the displacement rod comprises a connector 21, a spring gland 22 and a spring inner rod 23 which are integrally designed.

Further, the force measuring component comprises a compression spring 24, a spring sleeve 25, a pressure transmitting piece 26 and a pressure measuring element 27, wherein the spring sleeve 25 is fixed on the upper end face of the movable sample holder I8, the inner surface of the spring sleeve 25 is tightly contacted with the outer circumferential surface of the spring gland 22, the pressure measuring element 27, the pressure transmitting piece 26 and the compression spring 24 are sequentially placed in the spring sleeve 25, the compression spring 24 is contacted with the lower end face of the spring gland 22, and the pressure measuring element 27 is contacted with the upper end face of the movable sample holder I8. The utility model discloses a compression spring 24 will apply in screw thread formula power transmission's pressure conveying to pressure conveying piece 26 to transmit to portable sample frame I8, finally through linkage 9 and portable sample frame II 10, transmit pressure to test sample.

Further, the upper end face of the lower shell 5 is provided with a waterproof sealing connector 28. The waterproof sealing connector 28 penetrates through the lower shell 5, and the waterproof sealing connector and the lower shell are sealed by brazing; the waterproof sealing connector 28 is electrically connected to the pressure measuring element 27 by a high temperature resistant wire.

Further, the connecting rod group 9 comprises a plurality of connecting rods and balance adjusting nuts 29 which are uniformly distributed in the circumferential direction; wherein the linkage 9 passes through the movable sample holder I8, the movable sample holder II 10. The utility model discloses a portable sample frame I8, portable sample frame II 10 distance are adjusted to balance adjustment nut 29, keep the two relatively parallel. The movable sample holder II 10 can be designed into a circular ring type.

Further, the vertical circumference of the sealing metal corrugated pipe 12 is hermetically welded to the displacement rod 3 through a welding ring 30, a sealing gasket 31 is arranged between the sealing metal corrugated pipe 12 and the sealing disc 6, and the sealing gasket 31 is simultaneously positioned between the upper shell and the lower shell.

Claims

1. A creep irradiation device suitable for stress static loading is characterized by comprising an upper shell (1), a lower shell (5), a thread type power transmission mechanism (2) and a displacement rod (3) which are arranged in the upper shell (1), a force measuring component (7) arranged in the lower shell (5), a movable sample rack I (8), a movable sample rack II (10) and a fixed sample rack (11); wherein the upper shell (1) and the lower shell (5) are connected in a sealing way; the screw thread type power transmission mechanism (2) is connected with a displacement rod (3) through a direction-changing connector (4), the displacement rod (3) penetrates through a sealing disc (6) at the top of a lower shell (5) and is connected with a movable sample rack I (8) through a force measuring component (7), and the movable sample rack I (8) is connected with a movable sample rack II (10) through a connecting rod group (9); the fixed sample rack (11) is positioned between the movable sample rack I (8) and the movable sample rack II (10) and is fixedly connected with the lower shell (5); wherein the sealing disc (6) is connected to the lower shell through a sealing nut; a sealing metal corrugated pipe (12) is sleeved on the displacement rod (3), one end of the sealing metal corrugated pipe (12) is connected with the displacement rod (3), and the other end of the sealing metal corrugated pipe is connected to the sealing disc (6); the outer diameter of the movable sample rack II (10) is tightly matched with the inner diameter of the lower shell (5).

2. The creep irradiation device suitable for stress static loading according to claim 1, wherein the screw thread type power transmission mechanism (2) comprises a transmission rod (14), a handle (13) detachably arranged on the transmission rod (14), a sealing filler (16) filled on the upper part of the upper shell and a filler cover (17), wherein the filler cover (17) is screwed on the top end of the upper shell (1), and the transmission rod (14) penetrates through the filler cover (17) and is connected to the direction-changing connector (4).

3. A creep irradiation device suitable for stress static loading according to claim 2, characterized in that the transmission rod (14) is provided with a transmission thread (15), the transmission thread (15) being a trapezoidal thread.

4. A creep irradiation device suitable for stress static loading according to claim 2, characterized in that the sealing filler (16) is a flexible graphite filler.

5. The creep irradiation device suitable for stress static loading according to claim 1, wherein the direction changing connector (4) comprises a steel ball (18), a pin (19) and a non-return stop (20), wherein the outer surface of the non-return stop (20) is connected with the transmission rod (14) of the screw thread type power transmission mechanism, and the inner surface is connected with the displacement rod (3) through the pin (19).

6. The creep irradiation device suitable for stress static loading according to claim 1, characterized in that the displacement rod (3) comprises an integrated connector (21), a spring gland (22) and an inner spring rod (23).

7. The creep irradiation device suitable for stress static loading according to claim 1, wherein the force measuring part (7) comprises a compression spring (24), a spring sleeve (25), a pressure transmitting piece (26) and a pressure measuring element (27), wherein the spring sleeve (25) is fixed on the upper end face of the movable sample holder I (8), the inner surface of the spring sleeve is in close contact with the outer circumferential surface of the spring gland (22), the pressure measuring element (27), the pressure transmitting piece (26) and the compression spring (24) are sequentially placed in the spring sleeve (25), wherein the compression spring (24) is in contact with the lower end face of the spring gland (22), and the pressure measuring element (27) is in contact with the upper end face of the movable sample holder I (8).

8. The creep irradiation device suitable for stress static loading according to claim 1, wherein the upper end face of the lower housing (5) is provided with a waterproof sealing connector (28), the waterproof sealing connector (28) penetrates through the lower housing (5) and the waterproof sealing connector and the lower housing are soldered and sealed; the waterproof sealing connector (28) is electrically connected with the pressure measuring element (27) through a high-temperature-resistant lead.

9. The creep irradiation device suitable for stress static loading according to claim 1, wherein the linkage (9) comprises a plurality of links, balance adjusting nuts (29), evenly distributed in the circumferential direction, and each link passes through the movable sample holder I (8) and the movable sample holder II (10).

10. The creep irradiation device suitable for stress static loading according to claim 1, wherein the sealing metal bellows (12) is sealed and welded to the displacement rod (3) vertically and circumferentially by a welding ring (30), a sealing gasket (31) is arranged between the sealing metal bellows (12) and the sealing disk (6), and the sealing gasket (31) is simultaneously positioned between the upper shell (1) and the lower shell (5).