Inflation protection device for welding thermocouple penetration piece of high-temperature gas cooled reactor pressure vessel

Abstract

The utility model discloses an inflation protection device for welding a thermocouple penetration piece of a high-temperature gas cooled reactor pressure vessel, which comprises a protection gas tank, a protection gas main pipeline and at least two protection gas branch pipelines, one end of the protection gas main pipeline is connected with the protection gas tank, and the protection gas branch pipelines are respectively communicated with the protection gas main pipeline. The protective gas branch pipeline is provided with a switch valve, one end, far away from the protective gas main pipeline, of the protective gas branch pipeline enters a nozzle of the high-temperature gas cooled reactor pressure vessel, the thermocouple penetration piece and the nozzle are sleeved and welded together, and the switch valve is located outside the high-temperature gas cooled reactor pressure vessel. All shielding gas branch pipelines required by a certain stage can be arranged in the pipe nozzle of the high-temperature gas cooled reactor pressure vessel in advance, and the on-off of the shielding gas is controlled outside the high-temperature gas cooled reactor pressure vessel, so that the suffocation risk caused by personnel entering the high-temperature gas cooled reactor pressure vessel with the shielding gas can be avoided, the personal safety is ensured, and the working efficiency is improved. Operation is convenient, and construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to an inflation protection device for welding a thermocouple penetrator of a high-temperature gas-cooled reactor pressure vessel. Background Art

[0002] The thermocouple penetrator of the primary loop pressure vessel of a high-temperature gas-cooled reactor is used to bundle and penetrate the armored thermocouple for measuring the temperature inside the primary loop pressure vessel through the primary loop pressure vessel, and has functions of sealing, pressure bearing and ensuring the electrical connection of the armored thermocouple, and belongs to a part of the primary loop pressure boundary.

[0003] The thermocouple penetrator of the pressure vessel is connected to the nozzle of the pressure vessel by welding. When the two are welded, all installation work such as the metal in-vessel components, graphite in-vessel components, and carbon in-vessel components inside the pressure vessel has been completed, which belongs to a confined space. There are more than ten nozzles at the lower part of the pressure vessel, and one nozzle corresponds to one thermocouple penetrator. The welding of the nozzle and the thermocouple penetrator adopts manual tungsten inert gas arc welding, and the welding work is carried out on the outside of the pressure vessel, but argon inflation protection needs to be carried out from the inside of the pressure vessel. If a person enters the pressure vessel through the manhole of the pressure vessel to deploy the argon inflation protection device corresponding to one nozzle for welding one nozzle, there will be a risk of suffocation for the person. Specifically, after the welding of the first nozzle is completed, the person needs to enter the inside of the pressure vessel through the manhole, remove the argon inflation protection device of the first nozzle, and then install it on the second nozzle (the nozzle to be welded). At this time, the argon content in the pressure vessel is high, and it belongs to a confined space. It is very easy for people to suffocate when entering the inside of the pressure vessel, and the safety risk is extremely high.

[0004] In view of the above deficiencies, it is necessary to design an inflation protection device for welding a thermocouple penetrator of a high-temperature gas-cooled reactor pressure vessel. Content of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is that when a person enters a pressure vessel filled with argon to remove and re-arrange the argon inflation protection device in the existing argon inflation protection device, there is a risk of suffocation for the person, so as to provide an inflation protection device for welding a thermocouple penetrator of a high-temperature gas-cooled reactor pressure vessel.

[0006] To solve the above technical problems, the technical solution of the utility model is as follows:

[0007] A gas-filled protection device for welding thermocouple penetrations of a high-temperature gas-cooled reactor pressure vessel comprises a protective gas tank, a protective gas main line, and at least two protective gas branch lines, one end of the protective gas main line is connected to the protective gas tank, the protective gas branch lines are respectively connected to the protective gas main line, a switch valve is installed on the protective gas branch line, one end of the protective gas branch line away from the protective gas main line enters into a nozzle of the high-temperature gas-cooled reactor pressure vessel, the thermocouple penetration is sleeved and welded to the nozzle, and the switch valve is located outside the high-temperature gas-cooled reactor pressure vessel.

[0008] Furthermore, the shielding gas branch pipeline includes a hard pipe section and a soft pipe section connected to each other, and the hard pipe section is located outside the high temperature gas-cooled reactor pressure vessel.

[0009] Furthermore, the hard pipe section and the soft pipe section are connected via a second quick-connect connector.

[0010] Furthermore, the hard pipe section and the main shielding gas pipeline are integrally formed.

[0011] Further, the hard pipe section is connected to a side wall of the main shielding gas line, or the hard pipe section is an end of the main shielding gas line away from the shielding gas tank.

[0012] Furthermore, the main shielding gas line is connected to the shielding gas tank via a main connecting pipe, and the main connecting pipe is connected to the main shielding gas line via a first quick-connect joint.

[0013] Furthermore, a plurality of armored thermocouples are inserted into the thermocouple penetration piece, and the armored thermocouples extend into the nozzle.

[0014] Furthermore, the hose section is bound together with a plurality of the armored thermocouples.

[0015] Furthermore, it also includes a sealing element connected to the inner side wall of the high temperature gas-cooled reactor pressure vessel, and the sealing element is used to seal the gap between the nozzle and the hose section and the plurality of armored thermocouples.

[0016] Furthermore, the sealing element is a stainless steel tape.

[0017] The technical solution of the utility model has the following advantages:

[0018] 1. The inflatable protection device for welding the thermocouple penetration piece of the high-temperature gas-cooled reactor pressure vessel provided by the present utility model includes a protective gas tank, a main protective gas pipeline, and at least two protective gas branch pipelines. One end of the main protective gas pipeline is connected to the protective gas tank, and the protective gas branch pipelines are respectively communicated with the main protective gas pipeline. A switching valve is installed on the protective gas branch pipeline. The end of the protective gas branch pipeline far from the main protective gas pipeline enters the nozzle of the high-temperature gas-cooled reactor pressure vessel. The thermocouple penetration piece is sleeved and welded with the nozzle. The switching valve is located outside the high-temperature gas-cooled reactor pressure vessel. In this way, all the required protective gas branch pipelines in a certain stage can be arranged in advance in the nozzle of the high-temperature gas-cooled reactor pressure vessel, and the on-off of the protective gas can be controlled outside the high-temperature gas-cooled reactor pressure vessel, avoiding the asphyxiation risk caused by personnel entering the high-temperature gas-cooled reactor pressure vessel with protective gas.

[0019] 2. For the inflatable protection device for welding the thermocouple penetration piece of the high-temperature gas-cooled reactor pressure vessel provided by the present utility model, the hard pipe section is connected to the flexible pipe section through a second quick-connect joint; or, the main protective gas pipeline is connected to the protective gas tank through a main connecting pipe, and the main connecting pipe and the main protective gas pipeline are connected through a first quick-connect joint. In this way, the assembly efficiency of the inflatable protection device can be improved.

[0020] 3. The inflatable protection device for welding the thermocouple penetration piece of the high-temperature gas-cooled reactor pressure vessel provided by the present utility model further includes a sealing element connected to the inner side wall of the high-temperature gas-cooled reactor pressure vessel. The sealing element is used to seal the gaps between the nozzle, the flexible pipe section, and multiple armored thermocouples. In this way, a relatively sealed space can be formed between the nozzle and the thermocouple penetration piece, improving the utilization rate of the protective gas.

[0021] 4. For the inflatable protection device for welding the thermocouple penetration piece of the high-temperature gas-cooled reactor pressure vessel provided by the present utility model, the sealing element is a stainless steel tape. In this way, the sealing cost can be reduced, and at the same time, the availability of the sealing material can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the high-temperature gas-cooled reactor pressure vessel and the thermocouple penetration piece in the embodiment of the present utility model;

[0024] Figure 2 It is a schematic structural diagram of the inflatable protection device in the embodiment of the present utility model;

[0025] Figure 3 This is a schematic structural diagram of a hose section, a sealing element, a high-temperature cold storage pressure vessel, and a thermocouple penetrator in an embodiment of the present utility model.

[0026] Description of the reference numerals:

[0027] 1. High-temperature gas-cooled reactor pressure vessel; 10. Nozzle; 2. Thermocouple penetrator; 3. Armored thermocouple; 4. Protection gas tank; 41. Main valve; 51. Protection gas main pipeline; 511. Intake valve; 52. Main connecting pipe; 6. Protection gas branch pipeline; 61. Hard pipe section; 62. Hose section; 63. Switch valve; 64. Rope; 7. Sealing element; A. First quick-connect joint; B. Second quick-connect joint; C. Inner side wall; D. Outer side wall. Detailed implementation manners

[0028] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Such as Figures 1 to 3As shown in the figure, the utility model provides an inflation protection device for welding a thermocouple penetration piece of a high-temperature gas-cooled reactor pressure vessel, which includes a protective gas tank 4, a main protective gas pipeline 51, and at least two protective gas branch pipelines 6. One end of the main protective gas pipeline 51 is connected to the protective gas tank 4, the protective gas branch pipelines 6 are respectively communicated with the main protective gas pipeline 51, a switch valve 63 is installed on the protective gas branch pipeline 6, and one end of the protective gas branch pipeline 6 far from the main protective gas pipeline 51 enters the nozzle 10 of the high-temperature gas-cooled reactor pressure vessel 1. The thermocouple penetration piece 2 is sleeved and welded with the nozzle 10, and the switch valve 63 is located outside the high-temperature gas-cooled reactor pressure vessel 1.

[0033] In the utility model, since a switch valve 63 is installed on the protective gas branch pipeline 6, one end of the protective gas branch pipeline 6 far from the main protective gas pipeline 51 enters the nozzle 10 of the high-temperature gas-cooled reactor pressure vessel 1, the thermocouple penetration piece 2 is sleeved and welded with the nozzle 10, and the switch valve 63 is located outside the high-temperature gas-cooled reactor pressure vessel 1. In this way, all the protective gas branch pipelines 6 required in a certain stage can be arranged in the nozzle 10 of the high-temperature gas-cooled reactor pressure vessel 1 in advance, and the on-off of the protective gas can be controlled outside the pressure vessel, thereby avoiding the asphyxiation risk caused by personnel entering the high-temperature gas-cooled reactor pressure vessel with protective gas.

[0034] In this embodiment, the protective gas is argon, and of course it can also be nitrogen, helium, etc.

[0035] Furthermore, the protective gas branch pipeline 6 includes a hard pipe section 61 and a flexible pipe section 62 connected to each other, and the hard pipe section 61 is located outside the high-temperature gas-cooled reactor pressure vessel 1. Among them, the hard pipe section 61 of one protective gas branch pipeline 6 is the end of the main protective gas pipeline 51 far from the protective gas tank 4, and the hard pipe sections 61 of the remaining protective gas branch pipelines 6 are the pipe sections connected to the side wall of the main protective gas pipeline 51. In this embodiment, the hard pipe section 61 and the main protective gas pipeline 51 are integrally formed.

[0036] Furthermore, the hard pipe section 61 and the flexible pipe section 62 are connected by a second quick connector B to improve the connection efficiency between the flexible pipe section 62 and the hard pipe section 61.

[0037] Furthermore, the main protective gas pipeline 51 is connected to the protective gas tank 4 through a main connecting pipe 52, and the main connecting pipe 52 and the main protective gas pipeline 51 are connected by a first quick connector A to improve the connection efficiency between the main connecting pipe 52 and the main protective gas pipeline 51.

[0038] Furthermore, a main valve 41 is provided on the protective gas tank 4. An intake valve 511 is provided at one end of the main protective gas pipeline 51 close to the main connecting pipe 52, and the intake valve 511 is located upstream of the protective gas branch pipeline 6.

[0039] Furthermore, a plurality of armored thermocouples 3 are inserted into the thermocouple penetration piece 2 , and the armored thermocouples 3 extend into the nozzle 10 .

[0040] Furthermore, the hose section 62 is tied together with the plurality of armored thermocouples 3 , specifically, by using a rope 64 or an adhesive tape.

[0041] Furthermore, it also includes a sealing element 7 connected to the inner side wall C of the high temperature gas-cooled reactor pressure vessel 1, and the sealing element 7 is used to seal the gap between the nozzle 10 and the hose section 62 and the plurality of armored thermocouples 3. In this way, a relatively sealed space can be formed between the nozzle 10 and the thermocouple penetration piece 2, thereby improving the utilization rate of the protective gas. Specifically, the sealing element 7 is a stainless steel tape. Using stainless steel tape as the sealing element 7 can reduce the sealing cost and can be easily obtained. Of course, the sealing element 7 can also be a sealing sleeve, and the sealing sleeve is provided with a hole for the armored thermocouple 3 and the protective gas branch pipeline 6 to pass through, and the outer edge of the sealing sleeve is fixedly connected to the inner side wall C of the high temperature gas-cooled reactor pressure vessel 1. The thermocouple penetration piece 2 is plugged and matched with the nozzle 10 from the outer side wall D of the high temperature gas-cooled reactor pressure vessel 1 to the inner side wall C.

[0042] The working process of the gas-filled protective device for welding thermocouple penetrations of a high-temperature gas-cooled reactor pressure vessel in the utility model is described below:

[0043] Connecting a plurality of thermocouple penetration pieces 2, each of which is equipped with a plurality of armored thermocouples 3, to a plurality of nozzles 10 of a high temperature gas-cooled reactor pressure vessel 1 in a corresponding manner;

[0044] Connect the main shielding gas line 51 to the shielding gas tank 4 through the main connecting pipe 52;

[0045] Connect multiple shielding gas branch pipelines 6 to the shielding gas main pipeline 51 respectively, and the hard pipe section 61 is located outside the high-temperature gas-cooled reactor pressure vessel 1. At this time, ensure that all the switch valves 63 are in a closed state. When a pressure regulating valve is also provided on the shielding gas branch pipeline 6, the pressure of the shielding gas can be adjusted by the pressure regulating valve, and each shielding gas branch pipeline 6 is numbered;

[0046] The operator pulls a plurality of hose segments 62, enters the high temperature gas-cooled reactor pressure vessel 1 from the manhole on the high temperature gas-cooled reactor pressure vessel 1, and inserts the plurality of hose segments 62 into a plurality of nozzles 10 on the high temperature gas-cooled reactor pressure vessel 1, respectively. The nozzles 10 or the thermocouple penetration pieces 2 are marked with numbers corresponding to the shielding gas branch pipelines 6, so that before welding different nozzles 10 and thermocouple penetration pieces 2, the switch valve 63 on the correct shielding gas branch pipeline 6 can be opened;

[0047] Use rope 64 or tape to tie together the hose section 62 and the multiple armored thermocouples 3 entering the same nozzle 10;

[0048] Seal the gap between the nozzle 10, the hose section 62 and the multiple sheathed thermocouples 3 with the sealing element 7 to form a relatively sealed space between the nozzle 10 and the thermocouple penetrator 2;

[0049] Open the intake valve 511 and open the switch valve 63 on the corresponding protective gas branch pipeline 6;

[0050] The protective gas enters into the nozzle 10 along the main connecting pipe 52, the main protective gas pipeline 51 and the protective gas branch pipeline 6;

[0051] Start welding. During the welding process, protect the high-temperature gas-cooled reactor pressure vessel 1 and the thermocouple penetrator 2 with the protective gas;

[0052] After welding one nozzle 10 to the corresponding thermocouple penetrator 2, close the switch valve 63 on the corresponding protective gas branch pipeline 6;

[0053] Open another switch valve 63, and the protective gas enters into the corresponding nozzle 10;

[0054] Move the welding equipment to the corresponding nozzle 10, start welding, and so on, and complete the welding of the nozzle 10 and the thermocouple penetrator 2 one by one.

[0055] After welding is completed, close the main valve 41 on the protective gas tank 4 to stop gas supply, close the intake valve 511 and all the switch valves 63, disconnect the main connecting pipe 52 from the protective gas tank 4, and discharge the protective gas in the pipeline in the open area outside the high-temperature gas-cooled reactor pressure vessel 1. Personnel should leave the protective gas discharge area briefly. After the concentration of the protective gas in the environment drops, they can return to pick up the inflation protection device for welding, restore the work site, and ensure that the work is completed, the materials are used up, and the site is cleared.

[0056] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. An inflation protection device for welding a thermocouple penetration of a high-temperature gas-cooled reactor pressure vessel, characterized in that, The invention comprises a protective gas tank (4), a protective gas main line (51), and at least two protective gas branch lines (6), wherein one end of the protective gas main line (51) is connected to the protective gas tank (4), the protective gas branch lines (6) are respectively connected to the protective gas main line (51), a switch valve (63) is installed on the protective gas branch line (6), one end of the protective gas branch line (6) away from the protective gas main line (51) enters into a nozzle (10) of a high temperature gas-cooled reactor pressure vessel (1), the thermocouple penetration piece (2) is sleeved and welded to the nozzle (10), and the switch valve (63) is located outside the high temperature gas-cooled reactor pressure vessel (1).

2. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 1, wherein The shielding gas branch pipeline (6) comprises a hard pipe section (61) and a soft pipe section (62) which are connected to each other, and the hard pipe section (61) is located outside the high temperature gas-cooled reactor pressure vessel (1).

3. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 2, characterized in that, The hard pipe section (61) and the soft pipe section (62) are connected via a second quick-connect connector (B).

4. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 2, characterized in that, The hard pipe section (61) and the main shielding gas pipeline (51) are integrally formed.

5. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 2, characterized in that, The hard pipe section (61) is connected to the side wall of the main shielding gas line (51), or the hard pipe section (61) is an end of the main shielding gas line (51) away from the shielding gas tank (4).

6. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 1, wherein The main shielding gas line (51) is connected to the shielding gas tank (4) via a main connecting pipe (52), and the main connecting pipe (52) is connected to the main shielding gas line (51) via a first quick-connect joint (A).

7. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to any one of claims 2-5, characterized in that, A plurality of armored thermocouples (3) are inserted into the thermocouple penetration piece (2), and the armored thermocouples (3) extend into the nozzle (10).

8. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 7, characterized in that, The hose section (62) is bound together with a plurality of the armored thermocouples (3).

9. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 7, characterized in that, It also comprises a sealing element (7) connected to the inner side wall (C) of the high temperature gas-cooled reactor pressure vessel (1), wherein the sealing element (7) is used to seal the gap between the nozzle (10) and the hose section (62) and the plurality of armored thermocouples (3).

10. The gas-filled protection device for welding the thermocouple penetration of the high-temperature gas-cooled reactor pressure vessel according to claim 9, characterized in that, The sealing element (7) is a stainless steel tape.

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