Venturi for nuclear power plants

Abstract

The application relates to the technical field of nuclear power equipment, and discloses a Venturi tube for a nuclear power station, which comprises a pipe body and a first pressure lead pipe, a first opening is formed in the pipe body, a plurality of positioning strips are slidably connected to the first pressure lead pipe, the plurality of positioning strips are distributed along the circumference of the first pressure lead pipe, a plurality of positioning grooves are formed in the pipe body, and the positioning grooves are used for inserting the positioning strips. Staff members slide the positioning strips, so that the plurality of positioning strips can be inserted into the corresponding positioning grooves, the first pressure lead pipe and the pipe body can be pre-positioned, the staff members can weld the first pressure lead pipe and the pipe body in the gap between two positioning strips, then the staff members lift the positioning strips in sequence, the connection between the first pressure lead pipe and the pipe body at the position of the lifted positioning strip is welded, and the connection and sealing treatment between the pipe body and the first pressure lead pipe are realized.

Description

Technical Field

[0001] This application relates to the technical field of nuclear power equipment, and in particular to a venturi tube for nuclear power plants. Background Technology

[0002] A Venturi tube is a volumetric device, typically consisting of a section of pipe whose diameter gradually narrows to form a "throat" before gradually expanding back to its original size. Venturi tubes can be used in nuclear power plants, aviation, petroleum, chemical and other fields. Venturi tubes can measure the flow rate in orifice valves used in nuclear power plants.

[0003] The related technology includes a tube body, a first pressure-inducing pipe and a second pressure-inducing pipe. Both the first pressure-inducing pipe and the second pressure-inducing pipe are welded to the tube body. The tube body has a first opening and a second opening. The first pressure-inducing pipe is connected to the first opening, and the second pressure-inducing pipe is connected to the second opening.

[0004] Workers need to manually align the first pressure tap and the first opening before welding. It is difficult for workers to align them in one go, and workers are very likely to move the first pressure tap during the welding process, which can cause misalignment between the first pressure tap and the first opening, affecting the use of the venturi tube. Summary of the Invention

[0005] To improve the alignment problem between the first pressure tap and the first opening, this application provides a venturi tube for nuclear power plants.

[0006] This application provides a venturi tube for nuclear power plants, which adopts the following technical solution: A venturi tube for a nuclear power plant includes a tube body and a first pressure-inlet conduit. The tube body has a first opening, and a plurality of positioning strips are slidably connected to the first pressure-inlet conduit. The plurality of positioning strips are distributed circumferentially along the first pressure-inlet conduit. The tube body has a plurality of positioning grooves for the positioning strips to be inserted.

[0007] By adopting the above technical solution, the worker slides the positioning strips so that multiple positioning strips can be inserted into the corresponding positioning slots, so that the first pressure-sensing pipe and the pipe body can be pre-positioned. Since the positioning strips are distributed around the first pressure-sensing pipe, the worker can weld the first pressure-sensing pipe and the pipe body in the gap between two positioning strips. Then the worker lifts the positioning strips one by one and welds the connection between the first pressure-sensing pipe and the pipe body at the lifting positioning strip, so as to achieve the connection and sealing between the pipe body and the first pressure-sensing pipe.

[0008] Optionally, the first pressure-feeding pipe is provided with a receiving groove, a receiving spring is provided in the receiving groove, a receiving block is provided on the receiving spring, and a receiving hole is provided on the positioning strip for the receiving block to be inserted. The receiving spring drives the receiving block to be inserted into the receiving hole; when the receiving block is inserted into the receiving hole, the positioning strip does not abut against the pipe body.

[0009] By adopting the above technical solution, the receiving block is inserted into the receiving hole by the receiving spring, so that the receiving block can fix the positioning strip and reduce the possibility of the positioning strip sliding on the first pressure pipe. This eliminates the need for workers to press against the positioning strip, making it easier for workers to perform welding between the first pressure pipe and the pipe body.

[0010] Optionally, an operating block is slidably connected within the receiving hole, and the operating block can be completely located within the receiving hole.

[0011] By adopting the above technical solution, the operator slides the operating block. Since the operating block can be completely located inside the receiving hole, the operating block can drive the receiving block out of the receiving hole, so that the operator can slide the positioning bar and align the first pressure tapping pipe with the pipe body.

[0012] Optionally, the pipe body includes a first pipe and a second pipe, the second pipe having an inner pipe, the inner pipe having a constriction section, a throat and an expansion section, a fixing ring being slidably connected to the inner pipe, and the first pipe having an annular groove for the fixing ring to be inserted; when the fixing ring is inserted into the annular groove, the first pipe aligns with the second pipe.

[0013] By adopting the above technical solution, the workers first slide the fixing ring to insert it into the ring groove, so as to pre-fix the inner tube to the first pipe. Then, the workers weld the inner tube and the first pipe to fix the inner tube and the first pipe. At this time, the first pipe is aligned with the second pipe.

[0014] Optionally, an operating ring is rotatably connected to the inner tube, and an operating bar is provided inside the operating ring. The inner tube has a through hole for the operating bar to slide, and the through hole extends along the circumference of the inner tube. The fixed ring has a moving groove for the operating bar to be inserted, and the moving groove extends between the circumference and length of the fixed ring. The operating bar can pass through the through hole and be inserted into the moving groove.

[0015] By adopting the above technical solution, the operator rotates the operating ring, causing the operating bar to move. The operating bar moves within the through hole. In addition, the moving groove extends along the circumference and length of the fixed ring, allowing the operating bar to slide within the moving groove. This enables the operating bar to move the fixed ring, thereby inserting the fixed ring into the ring groove, reducing the movement of the fixed ring, and facilitating smooth welding.

[0016] Optionally, the inner tube is provided with an elastic block, and the operating ring is provided with an elastic groove for the elastic block to be inserted.

[0017] By adopting the above technical solution, the operating ring can be fixed on the inner tube by inserting the elastic block into the elastic groove, and the elastic block restricts the rotation of the operating ring.

[0018] Optionally, a rotating ring is rotatably connected to the tube body, and a through hole is formed on the rotating ring, which communicates with the first opening. A positioning hole is formed on the rotating ring for the positioning strip to be inserted. When the positioning strip passes through the positioning hole and is inserted into the positioning groove, the first opening and the through hole are aligned.

[0019] By adopting the above technical solution, when the perforation and the first opening are aligned, the first pressure-sensing pipe and the pipe body can be connected to each other. At the same time, the positioning strip is inserted into the positioning hole to fix the rotating ring, reducing the impact of the rotating ring's rotation on the measurement of the first pressure-sensing pipe. The operator rotates the rotating ring to block the first opening, at which point the operator can disassemble the first pressure-sensing pipe from the pipe body for maintenance. If the test data shows problems, it may be due to issues with the inner diameter of the inner pipe or the first pressure-sensing pipe. In this application, the rotating ring can be used to block the first opening for temporary sealing and quick replacement of the first pressure-sensing pipe to detect any problems and avoid losses caused by downtime testing.

[0020] Optionally, a stop strip is slidably connected to the tube body, and a stop groove is provided on the rotating ring for the stop strip to be inserted; when the stop strip is inserted into the stop groove, the rotating ring blocks the first opening.

[0021] By adopting the above technical solution, the stop strip is inserted into the stop groove, which restricts the rotation of the rotating ring, allowing the rotating ring to stably seal the first opening and reducing the possibility of the rotating ring rotating when the weld is removed.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The operator slides the positioning strips so that multiple positioning strips can be inserted into the corresponding positioning slots, so that the first pressure-sensing pipe and the pipe body can be pre-positioned. Since the positioning strips are distributed around the first pressure-sensing pipe, the operator can weld the first pressure-sensing pipe and the pipe body in the gap between two positioning strips. Then the operator lifts the positioning strips one by one and welds the connection between the first pressure-sensing pipe and the pipe body at the lifting positioning strip, so as to achieve the connection and sealing between the pipe body and the first pressure-sensing pipe.

[0023] 2. When the perforation and the first opening are aligned, the first pressure-sensing pipe and the pipe body can communicate with each other. At the same time, the positioning strip is inserted into the positioning hole to fix the rotating ring, reducing the impact of the rotating ring's rotation on the measurement of the first pressure-sensing pipe. The operator rotates the rotating ring to block the first opening, at which point the operator can disassemble the first pressure-sensing pipe from the pipe body for maintenance. If the test data shows problems, it may be due to issues with the inner diameter of the inner pipe or the first pressure-sensing pipe. In this application, the rotating ring can be used to block the first opening for temporary sealing and quick replacement of the first pressure-sensing pipe to detect any problems and avoid losses caused by downtime testing. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a cross-sectional view highlighting the inner tube in the embodiments of this application; Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle; Figure 4 This is an exploded view of the fixed ring in the embodiments of this application; Figure 5 yes Figure 2 Enlarged schematic diagram of part B in the middle; Figure 6 yes Figure 2 An enlarged schematic diagram of section C; Figure 7 yes Figure 1 An enlarged schematic diagram of part D in the middle.

[0025] Reference numerals: 1. Pipe body; 11. First pipe; 12. Second pipe; 13. Annular groove; 14. First opening; 141. Second opening; 15. Rotating groove; 151. Rotating ring; 152. Perforation; 153. Positioning hole; 154. Positioning groove; 16. Sliding groove; 161. Stop bar; 162. Stop groove; 2. First pressure-feeding pipe; 21. Second pressure-feeding pipe; 22. Positioning bar; 221. Receiving hole; 222. Operating block ; 23. Receiving groove; 231. Receiving spring; 232. Receiving block; 3. Inner tube; 31. Contraction part; 311. First groove; 312. First hole; 32. Throat; 321. Second groove; 322. Second hole; 33. Expansion part; 34. Sliding groove; 341. Fixing ring; 342. Moving groove; 343. Elastic block; 344. Elastic groove; 35. Operating ring; 351. Operating groove; 352. Through hole; 353. Operating bar. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0027] This embodiment discloses a venturi tube for a nuclear power plant. (Refer to...) Figure 1 A venturi tube for nuclear power plants includes a tube body 1, a first pressure inlet pipe 2, and a second pressure inlet pipe 21.

[0028] Reference Figure 2 The pipe body 1 includes a first pipe 11 and a second pipe 12. The second pipe 12 is provided with an inner pipe 3. The outer wall of the inner pipe 3 abuts against the inner wall of the second pipe 12, and the inner pipe 3 is connected to the first pipe 11.

[0029] Reference Figure 2 The inner tube 3 includes a contraction section 31, a throat 32, and an expansion section 33. The inner diameter of the contraction section 31 gradually decreases from the inner diameter of the first pipe 11 to the inner diameter of the throat 32, while the inner diameter of the throat 32 remains unchanged. The inner diameter of the expansion section 33 gradually increases to the inner diameter of the first pipe 11. The throat 32 is located between the contraction section 31 and the expansion section 33, and the contraction section 31, the throat 32, and the expansion section 33 are welded and fixed together.

[0030] Reference Figure 3 A sliding groove 34 is provided on the end face of the inner tube 3, and a fixing ring 341 is slidably connected in the sliding groove 34. The fixing ring 341 extends along the length direction of the inner tube 3. An annular groove 13 is provided on the end face of the first pipe 11 for the fixing ring 341 to be inserted. An operating ring 35 is rotatably connected to the outer surface of the inner tube 3, and the operating ring 35 rotates along the circumference of the inner tube 3.

[0031] Reference Figure 3 and Figure 4 An operating groove 351 is formed on the inner wall of the operating ring 35, and a through hole 352 connecting the sliding groove 34 is formed on the outer surface of the inner tube 3, extending circumferentially along the inner tube 3. A moving groove 342 is formed on the outer surface of the fixed ring 341, and the moving groove 342 is inclined, that is, it extends between the circumferential direction of the fixed ring 341 and the length direction of the operating ring 35. An operating bar 353 is provided in the operating groove 351, and the operating bar 353 can pass through the through hole 352 and be inserted into the moving groove 342.

[0032] Reference Figure 3 and Figure 4 When the operator rotates the operating ring 35, the operating ring 35 can drive the operating bar 353 to move along the extension direction of the through hole 352. Since the operating bar 353 is located in the moving groove 342, the operating bar 353 can drive the groove wall of the moving groove 342 to move, so that the fixed ring 341 can move along the length direction of the inner tube 3.

[0033] Reference Figure 3An elastic block 343 is fixedly connected to the wall of the sliding groove 34, and an elastic groove 344 is provided on the inner wall of the operating ring 35 for the elastic block 343 to be inserted. When the elastic block 343 is inserted into the elastic groove 344, the operating ring 35 can be fixed on the inner tube 3, and at this time the fixed ring 341 can be located in the moving groove 342.

[0034] Reference Figure 2 and Figure 5 The pipe body 1 has a first opening 14 and a second opening 141. The first opening 14 connects to the constriction section 31, and the second opening 141 connects to the throat section 32. A first groove 311 is formed on the outer surface of the constriction section 31, extending circumferentially along the constriction section 31. A plurality of first holes 312 are formed on the bottom wall of the first groove 311, arranged in an array circumferentially along the constriction section 31, and the first holes 312 connect to the interior of the constriction section 31. The first opening 14 connects to the first groove 311, allowing fluid to pass sequentially through the first hole 312 and the first groove 311 to reach the first opening 14.

[0035] Reference Figure 2 and Figure 6 A second groove 321 is formed on the outer surface of the throat 32, extending circumferentially along the throat 32. Multiple second holes 322 are formed on the bottom wall of the second groove 321, arranged in an array circumferentially along the throat 32, and communicating with the interior of the throat 32. A second opening 141 communicates with the second groove 321, allowing fluid to pass sequentially through the second holes 322 and the second groove 321 to reach the second opening 141.

[0036] Reference Figure 5 and Figure 6 Two rotating grooves 15 are formed on the outer surface of the second pipe 12, and a rotating ring 151 is rotatably connected within the rotating grooves 15. A through hole 152 is formed on the surface of the rotating ring 151, and the inner diameter of the through hole 152 is the same as the inner diameter of the first opening 14 and the inner diameter of the second opening 141. When the first pressure-sensing pipe 2 and the second pressure-sensing pipe 21 are installed on the second pipe 12, the first pressure-sensing pipe 2 connects the through hole 152 and the first opening 14, and the second pressure-sensing pipe 21 connects the through hole 152 and the second opening 141.

[0037] Reference Figure 5 Two positioning strips 22 are slidably connected to the outer surface of the first pressure-sensing pipe 2. The two positioning strips 22 are symmetrically arranged along the first pressure-sensing pipe 2, and the positioning strips 22 can slide along the length direction of the first pressure-sensing pipe 2.

[0038] Reference Figure 5The rotating ring 151 has a positioning hole 153 for the positioning strip 22 to be inserted into, and the outer surface of the second pipe 12 has a positioning groove 154 for the positioning strip 22 to be inserted into. When the positioning strip 22 passes through the positioning hole 153 and is inserted into the positioning groove 154, the first pressure pipe 2 aligns with the through hole 152 and the first opening 14.

[0039] Reference Figure 5 A receiving groove 23 is formed on the outer surface of the first pressure-inducing pipe 2, and a receiving spring 231 is fixedly connected inside the receiving groove 23. A receiving block 232 is fixedly connected to the surface of the receiving spring 231 away from the bottom wall of the receiving groove 23. The receiving spring 231 drives the receiving block 232 to protrude out of the receiving groove 23. When the receiving block 232 protrudes out of the receiving groove 23, the receiving spring 231 is in a compressed state.

[0040] Reference Figure 5 The positioning strip 22 has a receiving hole 221 on its side for inserting the receiving block 232. An operating block 222 is slidably connected inside the receiving hole 221, and the operating block 222 can be completely located inside the receiving hole 221. When the receiving block 232 is inserted into the receiving hole 221, the positioning strip 22 does not abut against the second pipe 12. By pressing the receiving block 232, the operator can fully insert the receiving block 232 into the receiving hole 221, allowing the receiving block 232 to retract into the receiving groove 23, thus enabling the receiving block 232 to be smoothly inserted into and into the receiving hole 221.

[0041] Reference Figure 5 and Figure 7 The outer surface of the second pipe 12 is provided with a sliding groove 16 that connects to the rotating groove 15, and a stop strip 161 is slidably connected in the sliding groove 16. A stop groove 162 is provided on the end face of the rotating ring 151 for the stop strip 161 to be inserted. When the stop strip 161 is inserted into the stop groove 162, the rotating ring 151 can block the first opening 14, at which time the operator can replace the first pressure pipe 2, so that the operator can replace the first pressure pipe 2 without stopping the machine.

[0042] The implementation principle of a venturi tube for a nuclear power plant in this application embodiment is as follows: The operator first rotates the operating ring 35, so that the operating ring 35 drives the fixed ring 341 to slide through the operating bar 353, so that the fixed ring 341 is inserted into the ring groove 13, thereby achieving relative fixation of the first pipe 11 and the inner pipe 3. Then the operator welds the first pipe 11 and the inner pipe 3.

[0043] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "an," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar terms mean that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.

Claims

1. A venturi tube for a nuclear power plant, comprising a tube body (1) and a first pressure inlet pipe (2), wherein the tube body (1) has a first opening (14), characterized in that: Multiple positioning strips (22) are slidably connected to the first pressure-inducing pipe (2). The multiple positioning strips (22) are distributed along the circumference of the first pressure-inducing pipe (2). Multiple positioning grooves (154) are opened on the pipe body (1). The positioning grooves (154) are for the positioning strips (22) to be inserted. The first pressure-feeding pipe (2) is provided with a receiving groove (23), a receiving spring (231) is provided in the receiving groove (23), a receiving block (232) is provided on the receiving spring (231), and a receiving hole (221) is provided on the positioning strip (22) for the receiving block (232) to be inserted. The receiving spring (231) drives the receiving block (232) to be inserted into the receiving hole (221). When the receiving block (232) is inserted into the receiving hole (221), the positioning strip (22) does not abut against the pipe body (1). A rotating ring (151) is rotatably connected to the tube body (1). A through hole (152) is provided on the rotating ring (151), and the through hole (152) is connected to the first opening (14). A positioning hole (153) is provided on the rotating ring (151) for the positioning strip (22) to be inserted. When the positioning strip (22) passes through the positioning hole (153) and is inserted into the positioning groove (154), the first opening (14) and the through hole (152) are aligned. A stop strip (161) is slidably connected to the tube body (1), and a stop groove (162) is provided on the rotating ring (151) for the stop strip (161) to be inserted; when the stop strip (161) is inserted into the stop groove (162), the rotating ring (151) blocks the first opening (14).

2. A venturi tube for a nuclear power plant according to claim 1, characterized in that: An operating block (222) is slidably connected inside the receiving hole (221), and the operating block (222) can be completely located inside the receiving hole (221).

3. A venturi tube for a nuclear power plant according to claim 1, characterized in that: The pipe body (1) includes a first pipe (11) and a second pipe (12). The second pipe (12) is provided with an inner pipe (3). The inner pipe (3) has a contraction part (31), a throat part (32) and an expansion part (33). A fixing ring (341) is slidably connected to the inner pipe (3). The first pipe (11) is provided with an annular groove (13) for the fixing ring (341) to be inserted. When the fixing ring (341) is inserted into the annular groove (13), the first pipe (11) is aligned with the second pipe (12).

4. A venturi tube for a nuclear power plant according to claim 3, characterized in that: An operating ring (35) is rotatably connected to the inner tube (3). An operating bar (353) is provided inside the operating ring (35). A through hole (352) for the operating bar (353) to slide is provided on the inner tube (3). The through hole (352) extends along the circumference of the inner tube (3). A moving groove (342) for the operating bar (353) to be inserted is provided on the fixed ring (341). The moving groove (342) extends between the circumference of the fixed ring (341) and the length direction of the fixed ring (341). The operating bar (353) can pass through the through hole (352) and be inserted into the moving groove (342).

5. A venturi tube for a nuclear power plant according to claim 4, characterized in that: The inner tube (3) is provided with an elastic block (343), and the operating ring (35) is provided with an elastic groove (344) for the elastic block (343) to be inserted.

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