Nuclear reactor detector manufacturing method, and nuclear reactor detector

Abstract

A nuclear reactor detector manufacturing method, the nuclear reactor detector comprising a detector body and a cable (300), wherein the detector body is provided with a first connector (200) made of a titanium alloy material, a housing material of the cable is stainless steel, and the detector body and the cable are connected by means of a welding transition piece (100); the welding transition piece is formed by joining two dissimilar metals by means of explosion welding, the welding transition piece comprises a welded stainless steel tube (110) and a welded titanium alloy tube (120), the cable is fixed to the welded stainless steel tube of the welding transition piece by means of laser welding, and then the first connector is fixed to the welded titanium alloy tube of the welding transition piece by means of argon arc welding. According to the nuclear reactor detector manufacturing method, explosion welding is used to obtain a welding transition piece, such that welds between a detector body and the welding transition piece, as well as between a cable and the welding transition piece, are both same-metal welds, thereby enabling an entire nuclear reactor detector to fully meet sealing requirements after assembly, and improving sealing performance thereof. The present application also relates to a nuclear reactor detector.

Description

Manufacturing methods of nuclear reactor detectors and nuclear reactor detectors Technical Field

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

[0002] In the field of nuclear power plant nuclear measurement detectors, nuclear reactor detectors are typically used in harsh environments (such as high radiation, high pressure, high humidity, or harsh environments caused by acidic spray fluids during accidents). However, nuclear reactor detectors require high electrical insulation during operation. Therefore, to ensure high electrical insulation in harsh environments, the detector body is typically made of titanium alloy with low neutron activation dose, while the outer shell of the integrated signal transmission cable connected to the nuclear reactor detector is made of stainless steel. Thus, the connection between the nuclear reactor detector and the cable is a dissimilar metal connection. In related technologies, dissimilar metal connections are usually achieved through brazing, crimping, etc., to achieve connection and sealing. However, because brazing solder is a reactive alloy with poor corrosion resistance, electrochemical phenomena can easily occur between dissimilar metals, causing rust and damaging the weld. Crimping, on the other hand, has insufficient strength at the connection point, making it susceptible to damage under stress and affecting sealing. Neither brazing nor crimping can fully guarantee the airtightness of the detector body when used in harsh environments, and the airtightness of the detector body directly affects the performance, function and service life of the nuclear reactor detector. Summary of the Invention

[0003] To address one of the technical problems existing in the prior art, this application provides a method for manufacturing a nuclear reactor detector and a nuclear reactor detector obtained by using the method, thereby solving the problem of sealing the connection between the detector body and the cable.

[0004] According to some embodiments of this application, a method for manufacturing a nuclear reactor detector is provided. The nuclear reactor detector includes a detector body and a cable. The detector body is provided with a first connector made of titanium alloy. The outer shell of the cable is made of stainless steel. A welding transition piece is provided between the detector body and the cable. 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. 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 between the cable and the welding transition piece are as follows: The outer sheath of one end of the cable is removed to expose a predetermined length of core wire; one end of the titanium alloy welded tube of the welding transition piece is embedded in the first connector; the cable is inserted through one end of the stainless steel welded tube of the welding transition piece, and the core wire of the cable with its outer sheath removed exits through one end of the titanium alloy welded tube, thus assembling the cable and the welding transition piece; the stainless steel welded tube and the outer shell of the cable are laser welded.

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

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

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

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

[0010] In some embodiments, after the first connector is welded and fixed to the titanium alloy welded 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, which are connected to the first connector by screws; each of the two cable fixing brackets has a cable fixing slot on one of its opposite sides, and when the cable fixing slots of the two cable fixing brackets are spliced ​​together, the two cable fixing slots form a fixing structure with a central hole to allow the cable to pass through.

[0012] In some embodiments, the cable fixing slots are provided with several corresponding through holes to fix the two cable fixing slots by bolt connection, so that the cable is clamped and fixed.

[0013] In addition, this application also provides a nuclear reactor detector, which is obtained by the above-described method for manufacturing a nuclear reactor detector.

[0014] The beneficial effects of this application are as follows: This application provides a method for manufacturing a nuclear reactor detector and a nuclear reactor detector obtained by using this method. The method for manufacturing a nuclear reactor detector obtains a welding transition piece composed of dissimilar metals through explosive welding. The sealing performance of the welding transition piece meets the requirements. Through the welding transition piece, the welding between the detector body and the welding transition piece, as well as between the cable and the welding transition piece, are all of the same metal. Furthermore, the combination of laser welding and argon arc welding can ensure that the entire nuclear reactor detector can fully meet the sealing requirements after assembly, thereby improving the sealing performance of the nuclear reactor detector.

[0015] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solution of this application, the following description will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0017] Figure 1 is a structural schematic diagram of the welding transition piece provided in this application;

[0018] Figure 2 is a schematic diagram of the connection between the welding transition piece, the first connector, and the cable.

[0019] Label Explanation:

[0020] Welding 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 Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0022] Furthermore, 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 be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0023] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0024] The following description, in conjunction with the embodiments provided in Figures 1 and 2, further elaborates on the method for manufacturing the nuclear reactor detector proposed in this application and the nuclear reactor detector obtained by using this method.

[0025] As shown in Figures 1 and 2, in some embodiments, this application provides a method for manufacturing a nuclear reactor detector, and a nuclear reactor detector obtained using this method. Specifically, the nuclear reactor detector includes a detector body and a cable 300. The detector body is provided with a first connector 200 made of titanium alloy. The outer shell of the cable 300 is made of 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 by the welding transition piece 100. In this 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. This application provides a method for manufacturing a nuclear reactor detector and a nuclear reactor detector obtained by using this method. The method for manufacturing the nuclear reactor detector involves explosive welding to obtain a welding transition piece 100 composed of dissimilar metals. The sealing performance of the welding transition piece 100 meets the requirements. By welding the transition piece 100, the detector body and the welding transition piece 100, as well as the cable 300 and the welding transition piece 100, are all welded with the same metal. Furthermore, laser welding and argon arc welding can be combined to ensure that the entire nuclear reactor detector can fully meet the sealing requirements after assembly, thereby improving the sealing performance of the nuclear reactor detector.

[0026] As shown in Figures 1 and 2, in some embodiments, the connection steps between the cable 300 and the welding transition piece 100 are as follows: The outer sheath of one end of the cable 300 is removed to expose a predetermined length of core wire; one end of the titanium alloy welded pipe 120 of the welding transition piece 100 is embedded in the first connector 200; the cable 300 is inserted through one end of the stainless steel welded pipe 110 of the welding transition piece 100, and the core wire of the cable 300 with its outer sheath removed exits through one end of the titanium alloy welded pipe 120, thus assembling the cable 300 and the welding transition piece 100; the stainless steel welded pipe 110 and the outer shell of the cable 300 are then laser-welded. After assembling the cable 300 and the welding transition piece 100 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, laser welding between the same materials can meet the sealing requirements.

[0027] As readily apparent in Figure 2, in some embodiments, a sealing element 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 sealing element, and the sealing element is fixed to the stainless steel welded pipe 110 by laser welding. The lead-out tube is then sealed by laser welding to seal the lead-out tube of the cable 300 core wire. The sealing element guides and seals the core wire of the cable 300. The sealing element is also made of stainless steel, ensuring that the connection between the sealing element and the stainless steel welded pipe 110 is still 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, and a protective layer is brazed outside the laser weld seam to protect it. By setting a protective layer to cover the laser weld seam through induction brazing, corrosion and rust can be effectively prevented from occurring, further improving the waterproof sealing performance of the laser weld seam and enhancing the overall sealing performance of the product.

[0029] As shown in Figure 1, in some embodiments, a titanium alloy welded pipe 120 is sleeved over a stainless steel welded pipe 110, with at least a portion of the stainless steel welded pipe 110 exposed outside the titanium alloy welded pipe 120. The overlapping portions of the stainless steel welded pipe 110 and the titanium alloy welded pipe 120 are connected together by explosive welding to form a weld transition piece 100. Explosive welding is a solid-state process that uses chemical explosives to directly push one metal onto another at extremely high speeds. This process does not melt either metal but rather plasticizes the surfaces of the two metals to form plasma, allowing them to come into full and tight contact to form a weld. Therefore, after explosive welding, the sealing performance of the weld transition piece 100 meets the requirements and is better than that of laser welding and argon arc welding. Specifically, the end of the stainless steel welded pipe 110 exposed outside the titanium alloy welded pipe 120 and furthest from the titanium alloy welded pipe 120 constitutes the first welding end 111, and the end of the titanium alloy welded pipe 120 furthest from the first welding end 111 constitutes the second welding end 121.

[0030] As shown in Figure 1, in some embodiments, the outer diameter of the titanium alloy welded pipe 120 is 14 mm, the same as the outer diameter of the first connector 200 on the detector body, so that the titanium alloy welded pipe 120 and the first connector 200 can be connected and sealed by manual argon arc welding. Furthermore, 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 slightly larger inner diameter of the stainless steel welded pipe 110 facilitates the passage of the cable 300 through the stainless steel welded pipe 110. It should be noted that the specific dimensions listed in this application are only one embodiment; in practical applications, other dimensions can be selected for the outer diameter of the titanium alloy welded pipe 120 and the inner diameter of the stainless steel welded pipe 110.

[0031] It is easy to imagine 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, through which the outer shell of the cable 300 can be fixed at the first welding end 111 to facilitate welding.

[0032] As shown in Figure 1, in some embodiments, the outer side of the titanium alloy welded pipe 120 at the first welding end 111 is set in a conical shape. The conical bevel design provides sufficient welding space for laser welding operations.

[0033] As shown in Figure 1, in some embodiments, the end of the titanium alloy welded pipe 120 away from the second welding end 121 is a fourth end 122, which is cone-shaped. The cone-shaped bevel design provides sufficient welding space for explosive welding operations.

[0034] As shown in Figure 1, 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. The third end 112 extends out of 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. This avoids contact between the cable 300 and the titanium alloy welded pipe 120, while also ensuring a 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 provided on the first connector 200 to fix the cable 300. Specifically, the cable fixing structure includes two opposing cable fixing brackets. Each of the two cable fixing brackets has a cable fixing slot on one opposite side. When the cable fixing slots of the two cable fixing brackets are joined together, they form a fixing structure with a central circular hole. The diameter of the circular hole is 7.5 mm, slightly larger than the outer diameter of the cable 300 (7.2 mm), allowing the cable 300 to pass through. The cable fixing brackets are connected to the first connector 200 by screws. Simultaneously, four corresponding through holes are opened on the cable fixing slots to connect and fix the two cable fixing slots and the cable 300 with bolts, thus clamping and fixing the cable 300. Through the cable fixing structure, the cable 300 can be better fixed to the first connector 200, preventing the weld from being dislodged due to cable movement.

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

[0037] Step 1: Prepare a cable 300 of appropriate length, a welding transition piece 100 and a detector body. The welding transition piece 100 is the same as described above. The detector body is provided with a first connector 200 made of titanium alloy.

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

[0039] Step 3: Embed one end of the titanium alloy welded tube 120 of the welding transition piece 100 onto the first connector 200 of the detector body, so that the cable 300 passes through one end of the stainless steel welded tube 110 of the welding transition piece 100, and the core wire of the cable 300 with its outer sheath removed passes through one end of the titanium alloy welded tube 120, thereby realizing 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 welded pipe 110 to the outer shell of the cable 300. After the laser welding is completed, braze a layer on the outside of 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: The third end 112 of the stainless steel welded pipe 110 is laser welded to the sealing element. The core wire of the cable 300 passes through the lead-out tube of the sealing element, and the lead-out tube is then laser welded to seal it, so as to seal the lead-out tube of the core wire of the cable 300.

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

[0043] Step 7: When the immersion test meets the requirements, solder the connectors to cable 300;

[0044] Step 8: After the connector welding of the cable 300 is completed, the inner wall of the titanium alloy welded pipe 120 of the welding transition piece 100 is argon arc welded to the first connector 200. Since the titanium alloy welded pipe 120 and the first connector 200 are both titanium metal, they are the same metal. 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 set on the first connector 200 to fix the cable 300. The cable fixing structure includes two opposing cable fixing brackets. Each of the two cable fixing brackets has a cable fixing slot on one of its opposite sides. When the cable fixing slots of the two cable fixing brackets are spliced ​​together, the two cable fixing slots form a fixing structure with a circular hole in the middle. The diameter of the circular hole is 7.5mm, which is slightly larger than the outer diameter of the cable 300 (7.2mm) 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 corresponding through holes are opened on the cable fixing slots to fix the two cable fixing slots and the cable 300 by bolts so that the cable 300 is clamped and fixed.

[0046] By using the above-described method for manufacturing nuclear reactor detectors, a nuclear reactor detector with a sealing performance that meets the requirements for connection with cables can be obtained.

[0047] It is understood that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this application. It should be noted that, for those skilled in the art, without departing from the concept of this application, the above technical features can be freely combined, and several modifications and improvements can be made, all of which fall within the protection scope of this application. Therefore, all equivalent transformations and modifications made within the scope of the claims of this application should fall within the coverage of the claims of this application.

Claims

1. A manufacturing method of a nuclear reactor probe, the nuclear reactor probe comprising a probe body and a cable, the probe body being provided with a first connector made of a titanium alloy material, and the cable having a shell made of stainless steel, characterized in that, 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. Then, the first connector is fixed to the titanium alloy welded pipe of the welding transition piece by argon arc welding.

2. The method of claim 1, wherein the step of forming the nuclear reactor probe comprises the step of: The connection steps between the cable and the welding transition piece are as follows: The outer sheath of one end of the cable is removed to expose a predetermined length of core wire. One end of the titanium alloy welded pipe of the welding transition piece is embedded in the first connector. The cable is inserted from one end of the stainless steel welded pipe of the welding transition piece, and the core wire of the cable with its outer sheath removed is inserted from one end of the titanium alloy welded pipe, thereby assembling the cable with the welding transition piece. The stainless steel welded pipe is laser welded to the outer shell of the cable.

3. The method of claim 2, wherein the step of forming the nuclear reactor probe comprises the step of: A sealing element is provided on the core wire of the cable. The core wire of the cable passes through the lead-out tube of the sealing element. The sealing element is fixed to the stainless steel welded tube by laser welding. The lead-out tube is then sealed by laser welding to seal the lead-out tube of the cable core wire. ​ 4. The method of claim 3, wherein the step of forming the nuclear reactor probe comprises the step of: Induction brazing is performed at the weld seam produced by laser welding, and a protective layer is brazed outside the laser weld seam to protect it.

5. The method of claim 1, wherein the step of forming the nuclear reactor probe comprises the step of: The titanium alloy welded pipe is sleeved outside the stainless steel welded pipe, and at least part of the stainless steel welded pipe is exposed outside the titanium alloy welded pipe. The overlapping parts of the stainless steel welded pipe and the titanium alloy welded pipe are connected together by explosive welding to form the welded transition piece. ​ The end of the stainless steel welded pipe that is exposed outside the titanium alloy welded pipe and away from the titanium alloy welded pipe constitutes the first welding end, and the end of the titanium alloy welded pipe that is away from the first welding end constitutes the second welding end.

6. The method of claim 5, wherein the step of forming the nuclear reactor probe comprises the step of: The outer diameter of the titanium alloy welded pipe is 14 mm. The inner diameter of the stainless steel welded pipe is slightly larger than 4 mm.

7. The method of claim 1, wherein the step of forming the nuclear reactor probe comprises the step of: After the first connector is welded and fixed to the titanium alloy welded pipe, a cable fixing structure can also be provided on the first connector to fix the cable. ​ 8. The method of claim 7, wherein the step of forming the nuclear reactor probe comprises the step of: The cable fixing structure includes two opposing cable fixing brackets, which are connected to the first connector by screws; ​ Both cable fixing brackets have cable fixing slots on opposite sides at one end. When the cable fixing slots of the two cable fixing brackets are spliced ​​together, the two cable fixing slots form a fixing structure with a round hole in the middle, so that the cable can pass through.

9. The method of claim 8, wherein the step of forming the nuclear reactor probe comprises the step of: The cable fixing slots are provided with several corresponding through holes to connect and fix the two cable fixing slots with bolts so that the cable is clamped and fixed. ​ 10. A nuclear reactor probe, characterized by, The nuclear reactor detector is obtained using the manufacturing method of the nuclear reactor detector according to any one of claims 1 to 9.

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