Pressurizing pipe for hydraulic test of reactor core detector and welding method of pressurizing pipe

Abstract

The invention discloses a pressurizing pipe for a hydraulic test of a reactor core detector and a welding method thereof, and relates to the technical field of test tools.The pressurizing pipe comprises a pipe body and a first exhaust assembly, the pipe body is internally provided with a test cavity, one end of the pipe body is provided with a first connector, the other end of the pipe body is provided with a second connector, and the first connector is used for being connected with a to-be-tested piece; the second joint is connected with a hydraulic press; the first exhaust assembly comprises a first exhaust pipe and a control valve, the first exhaust pipe is arranged on the outer surface of the pipe body, the first exhaust pipe is provided with an exhaust channel communicated with the test cavity, the control valve is connected with the first exhaust pipe, and the control valve can open and close the exhaust channel. According to the pressurizing pipe for the hydraulic test of the reactor core detector and the welding method of the pressurizing pipe, the structure is simple, the manufacturing cost is low, and air in the test cavity can be exhausted as much as possible.

Description

Technical Field

[0001] This invention relates to the field of testing tooling technology, and in particular to a pressure tube for hydrostatic testing of reactor core detectors and its welding method. Background Technology

[0002] In nuclear reactors at nuclear power plants, core detectors are required to monitor the state of the reactor core. In the harsh environment of the core, characterized by high temperature, high pressure, and high radiation, the pressure-bearing shell of the core detectors faces stringent requirements. For example, the welds on the pressure-bearing shell of the core detectors are nuclear-grade welds, demanding even higher quality. To meet the long-term stable operation requirements of the core detectors, considering their sealing performance, structural strength, and long-term reliability, the simplest approach is to conduct a hydrostatic test on the core detectors. This verifies whether the pressure-bearing boundaries, such as the core detector sleeve, sealing welds, and penetrations, possess sufficient structural strength and pressure-bearing capacity.

[0003] Because core detectors are installed inside nuclear reactors, they are typically long tubular structures, reaching lengths of approximately 12 meters. To conduct hydrostatic tests on these detectors, a specific pressure vessel or structure is required due to their length, providing a sufficient hydrostatic environment. However, currently used pressure vessels are expensive to construct and struggle to completely purge air from within. During the hydrostatic test, residual air is compressed to high pressure, and changes in air volume due to variations in ambient temperature can affect the stability of the hydrostatic pressure during the test, thus impacting the accuracy of the results. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a pressure tube for hydrostatic testing of reactor core detectors, which has a simple structure, low manufacturing cost, and can expel as much air as possible from the test chamber.

[0005] The present invention also proposes a welding method for pressure tubes.

[0006] According to a first aspect of the present invention, a pressure tube for hydrostatic testing of a reactor core detector includes a tube body, the tube body having a test chamber inside, one end of the tube body having a first connector, and the other end of the tube body having a second connector. The first connector is used to connect to the test piece, and the second connector is used to connect to a water supply press, the water supply press being able to inject water into the test chamber to immerse the test piece located in the test chamber. A first exhaust assembly includes a first exhaust pipe and a control valve. The first exhaust pipe is disposed on the outer surface of the pipe body and has an exhaust channel communicating with the test chamber. The control valve is connected to the first exhaust pipe and is capable of opening and closing the exhaust channel.

[0007] The pressure tube for hydrostatic testing of a reactor core detector according to an embodiment of the present invention has at least the following beneficial effects: the reactor core detector waiting to be tested is inserted into the test chamber of the tube body from the first connector, and the water supply press is connected to the second connector, which can inject water into the test chamber and increase the water pressure to the test pressure; during water injection, the control valve opens the exhaust channel, and the air in the test chamber can be discharged from the exhaust channel. After the exhaust channel overflows with water, the control valve is closed, and the water supply press can continue to inject water to increase the water pressure in the test chamber for hydrostatic testing. The entire pressure tube has a simple structure and low manufacturing cost, and the first exhaust assembly can discharge the air in the test chamber as much as possible, reducing the influence of residual air on the pressure test results.

[0008] According to some embodiments of the present invention, the test chamber includes an adjacent first chamber and a second chamber. Along the water injection direction of the water supply press, the water flow can sequentially pass through the second connector, the first chamber, the second chamber and the first connector. The inner diameter of the second chamber is larger than the inner diameter of the first chamber. The exhaust channel is connected to the second chamber.

[0009] According to some embodiments of the present invention, the first exhaust assembly further includes a one-way valve connected to the first exhaust pipe, wherein the flow direction of the one-way valve is the same as the direction from the first exhaust pipe to the external environment.

[0010] According to some embodiments of the present invention, an intermediate connector is further included, one end of which is provided with an external thread and the other end of which is provided with a locking ring. The first connector is provided with a socket, the socket is provided with an internal thread, the intermediate connector is inserted into the socket and connected by the thread, and the locking ring is used to connect and lock the test piece.

[0011] According to some embodiments of the present invention, a sealing gasket is provided between the intermediate connector and the first connector, the sealing gasket is located at the bottom of the insertion hole, and the intermediate connector abuts against the sealing gasket.

[0012] According to some embodiments of the present invention, a second exhaust pipe is further included, which is disposed on the outer surface of the pipe body. The second exhaust pipe is provided with a first channel and an adjustment cavity. The first channel communicates with the adjustment cavity. The adjustment cavity is located between the first channel and the test cavity. The adjustment cavity communicates with the test cavity. The first channel communicates with the external environment. A float assembly is placed in the adjustment cavity. The float assembly is configured to move with the liquid surface within the adjustment cavity. The size of the float assembly is larger than the inner diameter of the first channel.

[0013] According to some embodiments of the present invention, the second exhaust pipe is provided with a second channel, a first end of the second channel is connected to the first channel, a second end of the second channel is connected to the regulating chamber, an exhaust port is provided on the side wall of the second exhaust pipe, the exhaust port is used to connect the second channel and the external environment, an elastic component and a piston block are provided in the second channel, the piston block is located between the first end and the second end of the second channel, the piston block is movable in the second channel to block the exhaust port, the elastic component is connected to the piston block, and the elastic component is configured to drive the piston block to move from the exhaust port to the second end of the second channel.

[0014] According to some embodiments of the present invention, the elastic component includes a spring, one end of which is connected to the inner wall of the second channel, and the other end of which is connected to the piston block, wherein the piston block can compress the spring when it moves from the second end of the second channel toward the exhaust port.

[0015] According to some embodiments of the present invention, the pipe body includes multiple pipe segments, which are connected end to end along the axial direction of the pipe segments to form the pipe body.

[0016] According to a second aspect of the present invention, a welding method for a pressure-testing pipe is provided, wherein the pressure-testing pipe is composed of at least a plurality of pipe segments connected in sequence, the pipe segment at one end of the pressure-testing pipe is defined as the first pipe segment, the pipe segment at the other end of the pressure-testing pipe is defined as the tail pipe segment, and there are a plurality of intermediate segments between the first pipe segment and the tail pipe segment, the first pipe segment is connected to a first joint, and the tail pipe segment is connected to a second joint, the welding method for the pressure-testing pipe includes; The bevel of the weld joint between the first exhaust pipe and the first section pipe is processed into a V-shaped bevel; the bevel of the weld joint between several intermediate sections is processed into a double-sided V-shaped bevel; the bevel of the weld joint between the intermediate section and the tail section pipe is processed into a double-sided V-shaped bevel; and the bevel of the weld joint between the tail section pipe and the second joint is processed into a double-sided V-shaped bevel. Install each pipe section on the clamp, adjust the pipe openings at both ends of each weld joint to be in a concentric position, then introduce protective gas into the pipe section, and perform spot welding positioning at each weld joint. Maintain a protective gas flow through the pipe section and perform argon arc welding on each weld joint.

[0017] The welding method for the pressure testing pipe according to embodiments of the present invention has at least the following beneficial effects: connecting and welding multiple pipe segments to form a pressure testing pipe can reduce manufacturing costs while ensuring that the pressure testing pipe meets the usage requirements.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the pressure tube used for hydrostatic testing of the reactor core detector according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the pressure tube used for hydrostatic testing of the reactor core detector according to an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of the pressure tube used for hydrostatic testing of the reactor core detector according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the second exhaust pipe according to the first embodiment of the present invention; Figure 5 This is a cross-sectional view of the second exhaust pipe according to the second embodiment of the present invention.

[0020] Icon labels: The components include: tube body 100, test chamber 110, first chamber 111, second chamber 112, first connector 200, second connector 300, first exhaust assembly 400, first exhaust pipe 410, intermediate connector 500, sealing gasket 510, second exhaust pipe 600, first channel 610, adjustment chamber 620, float assembly 630, second channel 640, exhaust port 650, elastic assembly 660, and piston block 670. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] Reference Figure 1 and Figure 2 As shown, a pressure tube for hydrostatic testing of a reactor core detector according to an embodiment of the present invention includes a tube body 100 and a first venting assembly 400.

[0026] The tube body 100 has a test chamber 110 inside. One end of the tube body 100 has a first connector 200 and the other end has a second connector 300. The first connector 200 is used to connect the test piece and the second connector 300 is used to connect the water supply press. The first exhaust assembly 400 includes a first exhaust pipe 410 and a control valve. The first exhaust pipe 410 is disposed on the outer surface of the tube body 100 and has an exhaust channel communicating with the test chamber 110. The control valve is connected to the first exhaust pipe 410 and can open and close the exhaust channel.

[0027] During the hydrostatic test, the pipe body 100 should be set horizontally. The test piece (DPT) is then inserted into the test chamber 110 from the first connector 200 of the pipe body 100. The first venting assembly 400 should also be placed at the top of the pipe body 100. The position of the first venting assembly 400 can be adjusted by rotating the pipe body 100 circumferentially. It should be understood that in this embodiment, a core detector is specifically used as the DPT. Generally, the DPT can also be a relatively long cylindrical object; in some embodiments, the length of the DPT is approximately 11 meters. When the DPT is inserted into the test chamber 110, it is generally coaxial with the pipe body 100. After the DPT is connected to the first connector 200, the connection point can seal the first connector 200.

[0028] At the other end of the pipe body 100, namely at the second connector 300, it is connected to the water supply press. The water supply press is used to provide test water and can continuously supply water to increase the water pressure in the test chamber 110 and maintain a constant water pressure in the test chamber 110.

[0029] After connecting the tube 100 to the test piece and the water supply press, adjust the control valve to open the venting channel, and the water supply press begins to inject water into the test chamber 110. Since the tube 100 is placed horizontally, the liquid level in the test chamber 110 rises, forcing any remaining air inside to move upwards and exit through the venting channel at the top of the tube 100. The water supply press continues to inject water until water begins to overflow from the venting channel, indicating that the air inside the tube 100 has been completely expelled. At this point, adjust the control valve to close the venting channel, and the water supply press continues to inject water. The water pressure in the test chamber 110 gradually rises to the required test pressure, which is maintained for subsequent testing.

[0030] It is important to understand that the pressure testing pipe can be placed on a support frame to facilitate hydrostatic testing. The length of the support frame can be designed based on the length of the pipe body 100. For example, if the overall length of the pipe body 100 is 12 meters, the support frame can also be designed to be approximately 12 meters long. Furthermore, to facilitate moving the support frame and adjusting its length, the support frame can be designed as multiple independent support components, which can be assembled to form a longer support frame. Preferably, omnidirectional casters can be installed at the bottom of the support frame to facilitate handling and movement.

[0031] It is understood that the test chamber 110 includes an adjacent first chamber 111 and a second chamber 112. Along the water injection direction of the water supply press, the water flow can sequentially pass through the second connector 300, the first chamber 111, the second chamber 112 and the first connector 200. The inner diameter of the second chamber 112 is larger than the inner diameter of the first chamber 111, and the exhaust channel is connected to the second chamber 112.

[0032] Because the inner diameter of the second chamber 112 is larger than that of the first chamber 111, and the pipe body 100 is placed horizontally during the water pressure test, the test water in the test chamber 110 will first fill the first chamber 111, and then fill the second chamber 112. It's important to understand that when the first chamber 111 is full, the second chamber 112 also contains test water, but it is filled after the first chamber 111. The discharge channel is connected to the second chamber 112 because the air in the test chamber 110 will eventually be forced into the second chamber 112. Therefore, connecting the discharge channel to the second chamber 112 facilitates the final release of air from the second chamber 112. Meanwhile, the second chamber 112 is closer to the first connector 200 than the first chamber 111. That is, after the test piece is inserted into the pipe body 100 from the first connector 200, it needs to pass through the second chamber 112 before reaching the first chamber 111. Furthermore, the part of the test piece near the connector is generally not the object or focus of the hydrostatic test. In most cases, the part of the test piece that needs to be hydrostatically tested is located in the first chamber 111. Therefore, purging the air in the first chamber 111 as much as possible is beneficial to obtaining more accurate hydrostatic test results.

[0033] It is important to understand that the tube 100 must be placed horizontally in order to minimize the impact of inconsistent water pressure in the test chamber 110 due to different heights, and also to improve the accuracy of the water pressure test results.

[0034] Understandably, the first exhaust assembly 400 also includes a one-way valve connected to the first exhaust pipe 410, and the flow direction of the one-way valve is the same as the direction from the first exhaust pipe 410 to the external environment. The external environment refers to the environment outside the pipe body 100.

[0035] The above structure includes two embodiments, for example, a one-way valve is disposed between the first exhaust pipe 410 and the control valve, and the flow direction of the one-way valve is from the first exhaust pipe 410 toward the control valve; or the one-way valve is connected to the control valve, and the flow direction of the one-way valve is in the same direction as the direction from the first exhaust pipe 410 to the control valve.

[0036] The check valve is used to restrict the flow direction of water and air within the test chamber 110 or the second chamber 112, ensuring that water and air only flow out of the test chamber 110 towards the external environment. It should be understood that in the first embodiment, the check valve is located between the first exhaust pipe 410 and the control valve. While this connection structure can also restrict the flow direction of water and air, the high water pressure within the test chamber 110 during the hydrostatic test may act on the check valve, potentially reducing its lifespan. In the second embodiment, from a flow direction perspective, the check valve is located after the control valve, and the water pressure acts directly on the control valve. Since the control valve acts as an on / off valve, higher water pressure has a smaller impact on its lifespan.

[0037] Understandably, it also includes an intermediate connector 500, one end of which is provided with an external thread and the other end of which is provided with a locking ring. The first connector 200 is provided with an insertion hole, which is provided with an internal thread. The intermediate connector 500 is inserted into the insertion hole and connected by the thread. The locking ring is used to connect and lock the test piece.

[0038] The intermediate connector 500 serves as the connection between the device under test (DUT) and the first connector 200. Its shape can be modified to accommodate different types of DUTs. Therefore, the tube body 100 and the first connector 200 connected to it are universal components. The intermediate connector 500 and the first connector 200 are connected by threads, allowing for disassembly and replacement. This design reduces the variety of tube bodies 100 and first connectors 200, and the intermediate connector 500 has a lower replacement cost compared to the tube body 100. It should be understood that the locking ring is used to connect and lock the DUT; existing locking ring products can be used directly, and the specific structure of the locking ring will not be described in detail here.

[0039] Understandably, a sealing gasket 510 is provided between the intermediate connector 500 and the first connector 200. The sealing gasket 510 is located at the bottom of the insertion hole, and the intermediate connector 500 abuts against the sealing gasket 510. The sealing gasket 510 is used to improve the sealing performance between the intermediate connector 500 and the first connector 200, and can adapt to higher test water pressure.

[0040] Reference Figure 3 As shown, it can be understood that it also includes a second exhaust pipe 600, which is disposed on the outer surface of the pipe body 100. The second exhaust pipe 600 is provided with a first channel 610 and an adjustment cavity 620. The first channel 610 is connected to the adjustment cavity 620. The adjustment cavity 620 is located between the first channel 610 and the test cavity 110. The adjustment cavity 620 is connected to the test cavity 110. The first channel 610 is connected to the external environment. A float assembly 630 is placed in the adjustment cavity 620. The float assembly 630 is configured to move with the liquid surface within the adjustment cavity 620. The size of the float assembly 630 is larger than the inner diameter of the first channel 610.

[0041] Although the air in the test chamber 110 can be expelled through the first venting assembly 400 during the water filling stage, it is inevitable that a small amount of air will remain in the test chamber 110. Since the tube body 100 is made of a non-transparent material, when water overflows from the first venting pipe 410 of the first venting assembly 400, it is impossible to determine whether all the air has been expelled. At this point, adjusting the control valve closes the venting channel, and the water pressure in the test chamber 110 begins to rise.

[0042] With the second exhaust pipe 600 installed, even during periods of rising water pressure, the second exhaust pipe 600 can expel residual air from the test chamber 110. (Refer to...) Figure 4 As shown, it should be understood that the second exhaust pipe 600 should also be located at the top of the pipe body 100. Taking the test chamber 110 as an example, the air remaining in the test chamber 110 will be squeezed to the upper space of the test chamber 110 by the test water, and the air will move randomly along the axial direction of the test chamber 110. When the air moves to the position of the second exhaust pipe 600, the air will enter the regulating chamber 620 of the second exhaust pipe 600. It should be noted that before the air enters the regulating chamber 620, the regulating chamber 620 is filled with test water. The float assembly 630 in the regulating chamber 620 is pushed to the first channel 610 by buoyancy and blocks the first channel 610. Therefore, water will not overflow through the first channel 610 and cause the test chamber 110 to depressurize. Returning to the scenario where air moves into the regulating cavity 620, after the regulating cavity 620 is occupied by air, the density of air is much less than the density of the float assembly 630. Therefore, the float assembly 630 falls away from the first channel 610, the first channel 610 is opened, and the air in the regulating cavity 620 can be discharged through the first channel 610. After the air in the regulating cavity 620 is discharged, the regulating cavity 620 is refilled with water for testing, and the float assembly 630 floats up again and blocks the first channel 610.

[0043] Furthermore, after the float assembly 630 drops and opens the first channel 610, the air in the regulating chamber 620 is connected to the external environment. It's important to understand that since exhaust occurs through the second exhaust pipe 600 during the water pressure rise process, the water pressure is high, and the test water also compresses the air to a high pressure. After the air in the regulating chamber 620 is connected to the external environment, the pressure difference is large, and the air in the regulating chamber 620 is rapidly discharged from the first channel 610. The resulting airflow blows up the float assembly 630, causing it to block the first channel 610 again. Once the float assembly 630 blocks the first channel 610, there is no airflow, and the float assembly 630 drops and opens the first channel 610 again. Therefore, in the above structure, the float assembly 630 will repeatedly rise and fall at a high frequency, creating oscillations. When rising, the float assembly 630 will impact the first channel 610, and prolonged operation in this environment will reduce the lifespan of the float assembly 630.

[0044] To extend the service life of the float assembly 630, refer to Figure 5As shown, it can be understood that the second exhaust pipe 600 is provided with a second channel 640. The first end of the second channel 640 is connected to the first channel 610, and the second end of the second channel 640 is connected to the regulating chamber 620. An exhaust port 650 is provided on the side wall of the second exhaust pipe 600. The exhaust port 650 is used to connect the second channel 640 and the external environment. An elastic component 660 and a piston block 670 are provided in the second channel 640. The piston block 670 is located between the first end of the second channel 640 and the second end of the second channel 640. The piston block 670 can move in the second channel 640 to block the exhaust port 650. The elastic component 660 is connected to the piston block 670. The elastic component 660 is configured to drive the piston block 670 to move from the exhaust port 650 to the second end of the second channel 640.

[0045] Let's continue with the example of test chamber 110. First, when test chamber 110 is filled with water as much as possible, the water enters regulating chamber 620 and causes float assembly 630 to rise, blocking the first channel 610. After the first channel 610 is closed, the water continues to move towards the second channel 640. A piston block 670 is provided in the second channel 640, which divides the second channel 640. The water pushes the piston block 670 towards the exhaust port 650. At this time, the piston block 670 compresses the elastic component 660 until the piston block 670 moves to the exhaust port 650 and blocks the exhaust port 650. The force exerted by the compressed energy of the elastic component 660 on the piston block 670 can overcome the water pressure, so the piston block 670 remains in the state of blocking and closing the exhaust port 650. It is important to understand that the elastic modulus of the elastic component 660 can be pre-designed to ensure that after the piston block 670 closes the exhaust port 650, it can apply a force to overcome the water pressure, so that the piston block 670 is in force balance and maintains the closed exhaust port 650 state. Alternatively, preferably, a limiting part is provided in the second channel 640 to prevent the piston block 670 from moving excessively, specifically to control the piston block 670 to maintain the closed exhaust port 650 state.

[0046] Next, the residual air in test chamber 110 enters regulating chamber 620. The float assembly 630 still falls initially, but at this time, the exhaust port 650 is closed by the piston block 670. Air entering the first channel 610 cannot escape, so the air pressure does not drop rapidly. The pressure difference between regulating chamber 620 and the first channel 610 is small, resulting in a small airflow. The float assembly 630 will not be blown up and block the first channel 610, allowing air in regulating chamber 620 to continuously enter the first channel 610. After this structural improvement, the float assembly 630 will not oscillate or collide with the first channel 610, extending its lifespan. It is important to understand that as air gradually enters the first channel 610 from the regulating chamber 620, the air pressure in the first channel 610 increases. Since the air and water remain connected, the air pressure in the first channel 610 should be equal to or slightly lower than the water pressure. The air in the first channel 610 acts on the piston block 670, and combined with the force of the elastic component 660, this force is greater than the force exerted by the water pressure on the piston block 670. Therefore, the piston block 670 moves towards the second end of the second channel 640, opening the exhaust port 650, allowing the air in the first channel 610 to be discharged and depressurized. After the air in the first channel 610 is discharged, the regulating chamber 620 is refilled with water, the float component 630 rises and blocks the first channel 610, and water re-enters the second channel 640, pushing the piston block 670 towards the exhaust port 650, which is then blocked again by the piston block 670.

[0047] It is understood that in some embodiments, the elastic component 660 includes a spring, one end of which is connected to the inner wall of the second channel 640, and the other end of which is connected to a piston block 670, which can compress the spring when it moves from the second end of the second channel 640 toward the exhaust port 650.

[0048] It is understood that the pipe body 100 comprises multiple pipe segments, which are connected end-to-end along the axial direction to form the pipe body 100. Assembling the pipe body 100 using multiple pipe segments, such as by connecting and welding multiple stainless steel pipe segments end-to-end, can reduce the manufacturing cost of the pipe body 100 and facilitate the production of pipe bodies 100 of suitable length according to actual needs. In some embodiments, four 3m long pipe segments can be connected to obtain a 12m pipe body 100.

[0049] The present invention discloses a welding method for a pressure-pressurizing pipe, wherein the pressure-pressurizing pipe is composed of at least a plurality of pipe segments connected in sequence, the pipe segment at one end of the pressure-pressurizing pipe is defined as the first pipe segment, the pipe segment at the other end of the pressure-pressurizing pipe is defined as the tail pipe segment, there are a plurality of intermediate segments between the first pipe segment and the tail pipe segment, the first pipe segment is connected to a first joint, and the tail pipe segment is connected to a second joint. The welding method for the pressure-pressurizing pipe includes: The weld joint between the first exhaust pipe and the first section of pipe is beveled into a V-groove; the weld joints between several intermediate sections are beveled into a double-sided V-groove; the weld joint between the intermediate section and the tail section is beveled into a double-sided V-groove; and the weld joint between the tail section and the second joint is beveled into a double-sided V-groove. Each pipe section is mounted on a fixture, and the pipe ends of each weld joint are aligned concentrically. Shielding gas is then introduced into the pipe section, and spot welding is performed at each weld joint for positioning. With the shielding gas continuously supplied to the pipe section, argon arc welding is performed on each weld joint. Preferably, the blunt edge of all V-grooves and double-sided V-grooves is controlled within 1.0mm to 1.5mm.

[0050] In some embodiments, the bevels of each weld joint also need to be treated, deburred, and visually inspected. The bevel should be polished and cleaned over a 20mm-30mm area on both the inner and outer surfaces. Specifically, this can be done by first polishing with a wire brush, followed by cleaning with a lint-free cloth dampened with acetone.

[0051] When installing each pipe section onto the clamp, it is preferable to ensure that the misalignment between pipe sections is ≤0.3mm and the gap is uniformly ±0.5mm to guarantee welding quality. Argon gas can be used as the shielding gas introduced into the pipe section, with a purity controlled at ≥99.99% and a flow rate controlled at 15L / min. When performing spot welding positioning, a spot welding current of 45A is preferred.

[0052] During welding operations, each weld joint is subjected to argon arc welding. For each weld joint, the first step is root pass welding, followed by fill pass welding, and finally cap pass welding. During root pass welding, the welding current is 48A, and the base material with the blunt edge is melted. After welding, the slag and oxides are removed with a wire brush. During fill pass welding, the welding current is 2A higher than that of root pass welding. After welding, the slag and oxides are removed with a wire brush. During cap pass welding, the welding current is 48A. After welding, the slag and oxides are removed with a wire brush. When performing root pass welding, fill pass welding, and cap pass welding continuously, the temperature between each weld layer is controlled at ≤150℃.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A pressure testing tube for hydrostatic testing of reactor core detectors, characterized in that, include: The tube body (100) has a test chamber (110) inside. One end of the tube body (100) is provided with a first connector (200), and the other end of the tube body (100) is provided with a second connector (300). The first connector (200) is used to connect to the test piece, and the second connector (300) is used to connect to a water supply press. The water supply press can inject water into the test chamber (110) to immerse the test piece located in the test chamber (110). A first exhaust assembly (400) includes a first exhaust pipe (410) and a control valve. The first exhaust pipe (410) is disposed on the outer surface of the pipe body (100) and has an exhaust passage communicating with the test chamber (110). The control valve is connected to the first exhaust pipe (410) and is capable of opening and closing the exhaust passage.

2. The pressure testing tube for hydrostatic testing of a reactor core detector according to claim 1, characterized in that, The test chamber (110) includes an adjacent first chamber (111) and a second chamber (112). Along the water injection direction of the water supply press, the water can flow sequentially through the second connector (300), the first chamber (111), the second chamber (112) and the first connector (200). The inner diameter of the second chamber (112) is larger than the inner diameter of the first chamber (111). The exhaust channel is connected to the second chamber (112).

3. The pressure testing tube for hydrostatic testing of a reactor core detector according to claim 1, characterized in that, The first exhaust assembly (400) also includes a one-way valve connected to the first exhaust pipe (410), and the flow direction of the one-way valve is the same as the direction from the first exhaust pipe (410) to the external environment.

4. The pressure testing pipe for hydrostatic testing of a reactor core detector according to claim 1, characterized in that, It also includes an intermediate connector (500), one end of which is provided with an external thread and the other end of which is provided with a locking ring. The first connector (200) is provided with a socket, which is provided with an internal thread. The intermediate connector (500) is inserted into the socket and connected by the thread. The locking ring is used to connect and lock the test piece.

5. The pressure testing tube for hydrostatic testing of a reactor core detector according to claim 4, characterized in that, A sealing gasket (510) is provided between the intermediate connector (500) and the first connector (200). The sealing gasket (510) is located at the bottom of the insertion hole, and the intermediate connector (500) abuts against the sealing gasket (510).

6. The pressure testing tube for hydrostatic testing of a reactor core detector according to claim 1, characterized in that, It also includes a second exhaust pipe (600), which is disposed on the outer surface of the pipe body (100). The second exhaust pipe (600) is provided with a first channel (610) and an adjustment cavity (620). The first channel (610) is connected to the adjustment cavity (620). The adjustment cavity (620) is located between the first channel (610) and the test cavity (110). The adjustment cavity (620) is connected to the test cavity (110). The first channel (610) is connected to the external environment. A float assembly (630) is placed in the adjustment cavity (620). The float assembly (630) is configured to move with the liquid surface in the adjustment cavity (620). The size of the float assembly (630) is larger than the inner diameter of the first channel (610).

7. The pressure testing pipe for hydrostatic testing of a reactor core detector according to claim 6, characterized in that, The second exhaust pipe (600) is provided with a second channel (640), the first end of the second channel (640) is connected to the first channel (610), and the second end of the second channel (640) is connected to the regulating cavity (620). An exhaust port (650) is provided on the side wall of the second exhaust pipe (600), and the exhaust port (650) is used to connect the second channel (640) and the external environment. An elastic component (660) and a piston block (670) are provided in the second channel (640). The piston block (670) is located between the first end of the second channel (640) and the second end of the second channel (640). The piston block (670) can move in the second channel (640) to block the exhaust port (650). The elastic component (660) is connected to the piston block (670). The elastic component (660) is configured to drive the piston block (670) to move from the exhaust port (650) to the second end of the second channel (640).

8. The pressure testing tube for hydrostatic testing of a reactor core detector according to claim 7, characterized in that, The elastic component (660) includes a spring, one end of which is connected to the inner wall of the second channel (640), and the other end of which is connected to the piston block (670). The piston block (670) can compress the spring when it moves from the second end of the second channel (640) toward the exhaust port (650).

9. The pressure testing tube for hydrostatic testing of a reactor core detector according to claim 1, characterized in that, The pipe body (100) includes multiple pipe segments, which are connected end to end along the axial direction of the pipe segments to form the pipe body (100).

10. A welding method for a pressure-testing tube according to any one of claims 1 to 9, characterized in that: The pressure testing pipe is composed of at least a plurality of pipe segments connected in sequence. The pipe segment at one end of the pressure testing pipe is defined as the first pipe segment, the pipe segment at the other end of the pressure testing pipe is defined as the last pipe segment, and there are several intermediate segments between the first pipe segment and the last pipe segment. The first pipe segment is connected to a first joint, and the last pipe segment is connected to a second joint. The welding method of the pressure testing pipe includes: The bevel of the weld joint between the first exhaust pipe and the first section pipe is processed into a V-shaped bevel; the bevel of the weld joint between several intermediate sections is processed into a double-sided V-shaped bevel; the bevel of the weld joint between the intermediate section and the tail section pipe is processed into a double-sided V-shaped bevel; and the bevel of the weld joint between the tail section pipe and the second joint is processed into a double-sided V-shaped bevel. Install each pipe section on the clamp, adjust the pipe openings at both ends of each weld joint to be in a concentric position, then introduce protective gas into the pipe section, and perform spot welding positioning at each weld joint. Maintain a protective gas flow through the pipe section and perform argon arc welding on each weld joint.

Images