Manufacturing method of nuclear reactor detector and nuclear reactor detector

Abstract

The invention discloses a manufacturing method of a nuclear reactor detector and the nuclear reactor detector, the nuclear reactor detector comprises a detector body and a cable, the detector body is provided with a first connector made of a titanium alloy material, the shell material of the cable is stainless steel, and the detector body and the cable are connected through a welding transition piece; the welding transition piece is formed by explosive welding of two dissimilar metals and comprises a stainless steel welded pipe and a titanium alloy welded pipe, the cable and the stainless steel welded pipe of the welding transition piece are fixed through laser welding, and then the first connector and the titanium alloy welded pipe of the welding transition piece are fixed through argon arc welding. According to the manufacturing method of the nuclear reactor detector, the welding transition piece is obtained through explosive welding, the detector body and the welding transition piece are welded through the same metal, the cable and the welding transition piece are welded through the same metal, then the whole nuclear reactor detector can completely meet the sealing requirement after being assembled, and the sealing performance of the nuclear reactor detector is improved.

Description

Technical Field

[0001] This application relates to the field of nuclear measurement detectors in nuclear power plants, and particularly to a manufacturing method of a nuclear reactor detector and a nuclear reactor detector obtained by using the manufacturing method of the nuclear reactor detector. Background Art

[0002] In the field of nuclear measurement detectors in nuclear power plants, nuclear reactor detectors are usually used in harsh environments (such as high irradiation, high pressure, high humidity, or a harsh environment caused by the acidic spray liquid in an accident environment). However, high electrical insulation needs to be ensured during the use of nuclear reactor detectors. Therefore, to ensure high electrical insulation of nuclear reactor detectors in harsh environments, the detector body material usually uses a titanium alloy with a low neutron activation dose, and the outer shell material of the cable for integrated signal transmission connected to the nuclear reactor detector is stainless steel. Therefore, the connection between the nuclear reactor detector and the cable is a connection between dissimilar metals. In related technologies, the connection between dissimilar metals is usually achieved by brazing, crimping, etc. to realize the connection and sealing between dissimilar metals. However, since the brazing solder is a reactive alloy with poor corrosion resistance, electrochemical phenomena are likely to occur between dissimilar metals, which easily causes brazing to rust and thus damage the weld position; while the strength of the crimped position is insufficient, and the connection position is easily damaged when stressed, affecting the sealing performance. That is, neither of the two methods of brazing and crimping can fully guarantee the sealing performance of the detector body in harsh environments, and the sealing performance of the detector body will directly affect the performance, function, and service life of the nuclear reactor detector. Summary of the Invention

[0003] In order to solve one of the technical problems existing in the prior art, this application provides a manufacturing method of a nuclear reactor detector and a nuclear reactor detector obtained by using the manufacturing method of the nuclear reactor detector, so as to solve the problem of the connection sealing performance between the detector body and the cable.

[0004] According to a manufacturing method of a nuclear reactor detector provided by some embodiments of this application, the nuclear reactor detector includes a detector body and a cable. A first connector made of titanium alloy material is provided on the detector body. The outer shell material of the cable is stainless steel. A welding transition piece is provided between the detector body and the cable, and the detector body and the cable are connected through the welding transition piece. The welding transition piece is formed by explosive welding of dissimilar metals. The welding transition piece includes a stainless steel welded pipe and a titanium alloy welded pipe. The cable is fixed to the stainless steel welded pipe of the welding transition piece by laser welding, and then the first connector is fixed to the titanium alloy welded pipe of the welding transition piece by argon arc welding.

[0005] In some embodiments, the connection steps of the cable and the welding transition piece are as follows: Remove the outer skin of one end of the cable to expose the core wire of a preset length; One end of the titanium alloy welding pipe of the welding transition piece is embedded in the first connector, insert the cable into one end of the stainless steel welding pipe of the welding transition piece, and make the core wire of the cable without outer skin pass through one end of the titanium alloy welding pipe to realize the assembly of the cable and the welding transition piece; Laser weld the stainless steel welding pipe and the outer shell of the cable.

[0006] In some embodiments, a seal is provided on the core wire of the cable, the core wire of the cable passes through the lead-out pipe of the seal, the seal is laser welded and fixed to the stainless steel welding pipe, and the lead-out pipe is then laser welded and sealed to seal the lead-out pipe of the core wire of the cable.

[0007] In some embodiments, induction brazing is performed at the weld seam generated by laser welding, and a protective layer is brazed outside the laser weld seam to protect the laser weld seam.

[0008] In some embodiments, the titanium alloy welding pipe is sleeved outside the stainless steel welding pipe, and at least part of the stainless steel welding pipe is exposed outside the titanium alloy welding pipe. The overlapping part of the stainless steel welding pipe and the titanium alloy welding pipe is connected together by explosive welding to form the welding transition piece; One end of the stainless steel welding pipe exposed outside the titanium alloy welding pipe and away from the titanium alloy welding pipe forms a first welding end, and one end of the titanium alloy welding pipe away from the first welding end forms a second welding end.

[0009] In some embodiments, the outer diameter of the titanium alloy welding pipe is 14 mm; The inner diameter of the stainless steel welding pipe is slightly larger than 4 mm.

[0010] In some embodiments, after the first connector is welded and fixed to the titanium alloy welding pipe, a cable fixing structure may be provided on the first connector to fix the cable.

[0011] In some embodiments, the cable fixing structure includes two opposing cable fixing brackets, and the cable fixing brackets are connected to the first connector by screws; Cable fixing slots are provided on the opposite sides of one end of the two cable fixing brackets. When the cable fixing slots of the two cable fixing brackets are spliced oppositely, a fixing structure with a round hole in the middle is formed by enclosing the two cable fixing slots for the cable to pass through.

[0012] In some embodiments, a number of through holes corresponding to each other in position are respectively provided on the cable fixing slots to connect and fix the two cable fixing slots by bolts so that the cable is clamped and fixed.

[0013] In addition, the present application also provides a nuclear reactor detector, which is obtained by using the manufacturing method of the above-mentioned nuclear reactor detector.

[0014] The beneficial effects of the present application are as follows: The present application provides a manufacturing method of a nuclear reactor detector and a nuclear reactor detector obtained by using this method. The manufacturing method of this nuclear reactor detector obtains a welded transition piece composed of dissimilar metals through explosion welding, and the sealing performance of the welded transition piece meets the requirements. By means of the welded transition piece, the welding between the detector body and the welded transition piece and between the cable and the welded transition piece are both weldings of the same metal. Furthermore, by combining laser welding and argon arc welding, the entire nuclear reactor detector can fully meet the sealing requirements after assembly, improving the sealing performance of the nuclear reactor detector.

[0015] Other features and advantages of the present application will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures specifically pointed out in the specification, claims, and drawings. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the present application, the present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the welded transition piece provided by the present application;

[0018] Figure 2 is a schematic connection diagram of the welded transition piece with the first connector and the cable.

[0019] Label Description:

[0020] Welded transition piece 100, stainless steel welded pipe 110, first welding end 111, third end 112, titanium alloy welded pipe 120, second welding end 121, fourth end 122; first connector 200, cable 300. Detailed Embodiments

[0021] The present application will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0022] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment, and do not mean that they are the necessary sequences, unless it is stated otherwise that a certain sequence must be followed.

[0023] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connected" and "coupled" used in the present application, unless otherwise specified, both include direct and indirect connections (couplings).

[0024] Next, in combination with the Figures 1 to 2 embodiments provided, the manufacturing method of the nuclear reactor detector proposed in the present application and the nuclear reactor detector obtained by using the manufacturing method of the nuclear reactor detector will be further elaborated.

[0025] Such as Figure 1 and Figure 2As shown, in some embodiments, the present application provides a method for manufacturing a nuclear reactor detector, and a nuclear reactor detector obtained by using the method for manufacturing the nuclear reactor detector. Specifically, the nuclear reactor detector includes a detector body and a cable 300. A first connector 200 made of a titanium alloy material is provided on the detector body. The outer shell material of the cable 300 is stainless steel. A welding transition piece 100 is provided between the detector body and the cable 300, and the detector body and the cable 300 are connected through the welding transition piece 100. Among them, in the present application, the welding transition piece 100 is formed by explosive welding of two dissimilar metals. The welding transition piece 100 includes a stainless steel welded pipe 110 and a titanium alloy welded pipe 120. The cable 300 is fixed to the stainless steel welded pipe 110 of the welding transition piece 100 by laser welding, and then the first connector 200 is fixed to the titanium alloy welded pipe 120 of the welding transition piece 100 by argon arc welding. The present application provides a method for manufacturing a nuclear reactor detector and a nuclear reactor detector obtained by using the method. The method for manufacturing the nuclear reactor detector obtains a welding transition piece 100 composed of dissimilar metals through explosive welding. The sealing performance of the welding transition piece 100 meets the requirements. Through the welding transition piece 100, the welding between the detector body and the welding transition piece 100 and the welding between the cable 300 and the welding transition piece 100 are both weldings of the same metal. Furthermore, by combining laser welding and argon arc welding, the entire nuclear reactor detector can fully meet the sealing requirements after assembly, improving the sealing performance of the nuclear reactor detector.

[0026] As Figure 1 and Figure 2 shown, in some embodiments, the connection steps of the cable 300 and the welding transition piece 100 are as follows: Remove the cable outer skin at one end of the cable 300 to expose the core wire of a preset length; One end of the titanium alloy welded pipe 120 of the welding transition piece 100 is embedded on the first connector 200. The cable 300 is inserted into one end of the stainless steel welded pipe 110 of the welding transition piece 100, and the core wire of the cable 300 after removing the outer skin passes through one end of the titanium alloy welded pipe 120 to complete the assembly of the cable 300 and the welding transition piece 100; Laser weld the stainless steel welded pipe 110 and the outer shell of the cable 300. After the cable 300 and the welding transition piece 100 are assembled according to the above steps, since both the stainless steel welded pipe 110 and the outer shell of the cable 300 are made of stainless steel material, laser welding between the same materials can meet the sealing requirements.

[0027] It is easy to think that, as Figure 2As shown, in some embodiments, a seal is provided on the core wire of the cable 300. The core wire of the cable 300 passes through the lead-out tube of the seal. The seal is fixed to the stainless steel welded pipe 110 by laser welding, and then the lead-out tube is laser welded and sealed to seal the lead-out tube of the core wire of the cable 300. The seal guides and seals the core wire of the cable 300. The seal is also made of stainless steel material, so the connection between the seal and the stainless steel welded pipe 110 is still a connection of the same material. Laser welding can meet the sealing requirements.

[0028] Furthermore, in some embodiments, induction brazing is performed at the weld seam generated by laser welding. A protective layer is brazed outside the laser weld seam to protect the laser weld seam. By setting the protective layer to cover the laser weld seam through induction brazing, the corrosion and rust of the laser weld seam can be effectively prevented, the waterproof sealing performance of the laser weld seam can be further improved, and the overall sealing performance of the product can be improved.

[0029] As Figure 1 shown, in some embodiments, the titanium alloy welded pipe 120 is sleeved outside the stainless steel welded pipe 110, and at least part of the stainless steel welded pipe 110 is exposed outside the titanium alloy welded pipe 120. The overlapping part of the stainless steel welded pipe 110 and the titanium alloy welded pipe 120 is connected together by explosive welding to form a welded transition piece 100. Explosive welding is a solid-state process. By using chemical explosives to explode at an extremely high speed, one metal can be directly pushed onto another metal. In this process, neither metal is melted, but the surfaces of the two metals are plasticized to form a plasma, so that they are in full and close contact to form a weld seam. Therefore, after explosive welding, the sealing performance of the welded transition piece 100 meets the requirements, and it has better sealing performance than laser welding and argon arc welding. Among them, the end of the stainless steel welded pipe 110 that is exposed outside the titanium alloy welded pipe 120 and far from the titanium alloy welded pipe 120 forms a first welding end 111, and the end of the titanium alloy welded pipe 120 far from the first welding end 111 forms a second welding end 121.

[0030] As Figure 1 shown, in some embodiments, the outer diameter of the titanium alloy welded pipe 120 is 14 mm, which is the same as the outer diameter of the first connector 200 on the detector body, so as to facilitate the connection and sealing between the titanium alloy welded pipe 120 and the first connector 200 by manual argon arc welding. In addition, in some embodiments, the inner diameter of the stainless steel welded pipe 110 is slightly larger than 4 mm. Since the outer diameter of some standard cables 300 used in nuclear reactor detectors is 4 mm, the inner diameter of the stainless steel welded pipe 110 is slightly larger than 4 mm, which facilitates the cable 300 to pass through the stainless steel welded pipe 110. It should be noted that the specific dimensions listed in this application are only one of the embodiments. In actual applications, the outer diameter of the titanium alloy welded pipe 120 and the inner diameter of the stainless steel welded pipe 110 can also be selected as other dimensions.

[0031] It is easy to think that in some embodiments, the inner surface of the titanium alloy welded pipe 120 at the first welding end 111 is provided with a threaded surface, and the outer shell of the cable 300 can be fixed at the first welding end 111 through the threaded surface, so as to facilitate welding.

[0032] As Figure 1 shown, in some embodiments, the outer side of the titanium alloy welded pipe 120 at the first welding end 111 is set to be conical. Through the conical inclined surface design, sufficient welding space is provided for laser welding operation.

[0033] As Figure 1 shown, in some embodiments, the other end of the titanium alloy welded pipe 120 away from the second welding end 121 is the fourth end 122, and the fourth end 122 is set to be conical. Through the conical inclined surface design, sufficient welding space is provided for explosive welding operation.

[0034] As Figure 1 shown, in some embodiments, the other end of the stainless steel welded pipe 110 away from the first welding end 111 is the third end 112, and the third end 112 passes through the titanium alloy welded pipe 120 from the second welding end 121, so that both ends of the stainless steel welded pipe 110 protrude from the titanium alloy welded pipe 120, which not only avoids the contact between the cable 300 and the titanium alloy welded pipe 120, but also ensures the stable connection between the cable 300 and the stainless steel welded pipe 110.

[0035] Furthermore, in some embodiments, after the first connector 200 is welded and fixed to the titanium alloy welded pipe 120, a cable fixing structure can be further provided on the first connector 200 to fix the cable 300. Specifically, the cable fixing structure includes two opposite cable fixing frames, and cable fixing grooves are provided on the opposite side edges at one end of the two cable fixing frames. When the cable fixing grooves of the two cable fixing frames are spliced oppositely, a fixing structure with a circular hole in the middle is formed by the two cable fixing grooves. The diameter of the circular hole is 7.5 mm, which is slightly larger than the outer diameter of the cable 300, which is 7.2 mm, so that the cable 300 can pass through. The cable fixing frame and the first connector 200 are connected by screws; at the same time, four through holes corresponding to each other in position are respectively opened on the cable fixing grooves to connect and fix the two cable fixing grooves and the cable 300 through bolts, so that the cable 300 is clamped and fixed. Through the cable fixing structure, the cable 300 can be better fixed on the first connector 200, avoiding the force drop at the weld position caused by the movement of the cable.

[0036] In summary, the present application provides a method for manufacturing a nuclear reactor detector, including the following steps:

[0037] Step 1: Prepare a cable 300 of appropriate length, weld the transition piece 100 and the detector body. The welding transition piece 100 is the above-mentioned welding transition piece 100, and a first connector 200 made of titanium alloy material is provided on the detector body;

[0038] Step 2: Remove the outer skin of one end of the cable 300 to expose the core wire of the preset length;

[0039] Step 3: Insert one end of the titanium alloy welding pipe 120 of the welding transition piece 100 onto the first connector 200 of the detector body, pass the cable 300 through one end of the stainless steel welding pipe 110 of the welding transition piece 100, and make the core wire of the cable 300 without the outer skin pass through one end of the titanium alloy welding pipe 120, so as to realize the assembly of the cable 300 and the welding transition piece 100;

[0040] Step 4: Laser weld the first welding end 111 of the stainless steel welding pipe 110 to the outer shell of the cable 300. After the laser welding is completed, braze a layer outside the weld to protect the laser weld, so as to realize the laser welding of the cable 300 and the welding transition piece 100;

[0041] Step 5: Laser weld the third end 112 of the stainless steel welding pipe 110 to the seal. The core wire of the cable 300 passes through the lead-out pipe of the seal, and the lead-out pipe is then laser welded and sealed to seal the lead-out pipe of the core wire of the cable 300;

[0042] Step 6: Conduct a water immersion test on the cable 300 after sealing;

[0043] Step 7: When the water immersion test meets the requirements, weld the connector to the cable 300;

[0044] Step 8: After the connector welding of the cable 300 is completed, perform argon arc welding on the inner side wall of the titanium alloy welding pipe 120 of the welding transition piece 100 and the first connector 200. Since both the titanium alloy welding pipe 120 and the first connector 200 are made of titanium metal, it is a welding of the same kind of metal. Using argon arc welding can meet the sealing requirements, and due to the characteristics of argon arc welding, it can ensure the strength of the titanium metal to complete the assembly process;

[0045] Step 9: After the first connector 200 is welded and fixed to the titanium alloy welded pipe 120, a cable fixing structure is provided on the first connector 200 to fix the cable 300. The cable fixing structure includes two opposite cable fixing brackets. Cable fixing slots are provided on the opposite side edges at one end of the two cable fixing brackets. When the cable fixing slots of the two cable fixing brackets are spliced oppositely, a fixing structure with a round hole in the middle is formed by the two cable fixing slots. The diameter of the round hole is 7.5 mm, which is slightly larger than the outer diameter of the cable 300, which is 7.2 mm, so that the cable 300 can pass through. The cable fixing brackets are connected to the first connector 200 by screws. At the same time, four through holes corresponding to each other in position are respectively opened on the cable fixing slots to connect and fix the two cable fixing slots and the cable 300 by bolts, so that the cable 300 is clamped and fixed.

[0046] Through the above manufacturing method of the nuclear reactor detector, a nuclear reactor detector with a connection tightness that meets the requirements with the cable can be obtained.

[0047] It can be understood that the above embodiments only represent the preferred embodiments of the present application. The description is relatively specific and detailed, but it cannot be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present application. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present application shall fall within the scope covered by the claims of the present application.

Claims

1. A manufacturing method of a nuclear reactor detector, the nuclear reactor detector comprising a detector body and a cable, wherein a first connector made of titanium alloy material is provided on the detector body, and the outer shell material of the cable is stainless steel, characterized in that, A welding transition piece is arranged between the detector body and the cable, and the detector body and the cable are connected through the welding transition piece; The welding transition piece is formed by explosive welding of dissimilar metals. The welding transition piece includes a stainless steel welding pipe and a titanium alloy welding pipe. The cable is fixed to the stainless steel welding pipe of the welding transition piece by laser welding, and then the first connector is fixed to the titanium alloy welding pipe of the welding transition piece by argon arc welding.

2. The manufacturing method of the nuclear reactor detector according to claim 1, characterized in that, The connection steps of the cable and the welding transition piece are as follows: Remove the cable outer skin at one end of the cable to expose the core wire of a preset length; One end of the titanium alloy welding pipe of the welding transition piece is embedded in the first connector. The cable is inserted into one end of the stainless steel welding pipe of the welding transition piece, and the core wire of the cable after removing the outer skin passes through one end of the titanium alloy welding pipe to realize the assembly of the cable and the welding transition piece; Laser weld the stainless steel welding pipe and the outer shell of the cable.

3. The manufacturing method of the nuclear reactor detector according to claim 2, characterized in that, A seal is arranged on the core wire of the cable. The core wire of the cable passes through the lead-out pipe of the seal. The seal is fixed to the stainless steel welding pipe by laser welding, and the lead-out pipe is then laser welded and sealed to seal the core wire lead-out pipe of the cable.

4. The manufacturing method of the nuclear reactor detector according to claim 3, characterized in that, Induction brazing is carried out at the weld formed by laser welding, and a protective layer is brazed outside the laser weld to protect the laser weld.

5. The manufacturing method of the nuclear reactor detector according to claim 1, characterized in that, The titanium alloy welding pipe is sleeved outside the stainless steel welding pipe, and at least part of the stainless steel welding pipe is exposed outside the titanium alloy welding pipe. The overlapping part of the stainless steel welding pipe and the titanium alloy welding pipe is connected together by explosive welding to form the welding transition piece; The end of the stainless steel welding pipe that is exposed outside the titanium alloy welding pipe and away from the titanium alloy welding pipe forms a first welding end, and the end of the titanium alloy welding pipe away from the first welding end forms a second welding end.

6. The manufacturing method of the nuclear reactor detector according to claim 5, characterized in that The outer diameter of the titanium alloy welding pipe is 14 mm; The inner diameter of the stainless steel welding pipe is slightly larger than 4 mm.

7. The manufacturing method of the nuclear reactor detector according to claim 1, characterized in that, After the first connector is welded and fixed to the titanium alloy welding pipe, a cable fixing structure can also be arranged on the first connector to fix the cable.

8. The manufacturing method of the nuclear reactor detector according to claim 7, characterized in that, The cable fixing structure includes two opposite cable fixing brackets, and the cable fixing brackets are connected to the first connector by screws; Cable fixing grooves are arranged on the opposite side edges at one end of the two cable fixing brackets. When the cable fixing grooves of the two cable fixing brackets are spliced oppositely, a fixing structure with a round hole in the middle is formed by enclosing the two cable fixing grooves for the cable to pass through.

9. The manufacturing method of the nuclear reactor detector according to claim 8, characterized in that A number of through holes corresponding to each other in position are respectively opened on the cable fixing grooves to connect and fix the two cable fixing grooves by bolts so that the cable is clamped and fixed.

10. A nuclear reactor detector, characterized in that, The nuclear reactor detector is obtained by using the manufacturing method of the nuclear reactor detector according to any one of claims 1 to 9.

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