Uniform-speed tube flowmeter for nuclear power station

Abstract

The invention relates to the technical field of flow meters, and discloses a uniform-speed pipe flow meter for a nuclear power plant, which comprises a branch pipeline and a flow meter, the flow meter is arranged in the branch pipeline, the branch pipeline comprises a first pipeline and a second pipeline, the second pipeline is communicated with a main pipeline, and the first pipeline is positioned on one side, far away from the main pipeline, of the second pipeline; a first pipeline and a second pipeline are arranged between the first pipeline and the second pipeline, a first valve is arranged between the first pipeline and the second pipeline, and the flowmeter is detachably connected to the first pipeline through a fixing piece. And then, a worker blocks the space between the first pipeline and the second pipeline through the first valve, and at the moment, the flowmeter can be directly taken out without influencing the main pipeline, so that the flowmeter can be conveniently maintained under the condition that the main pipeline is not stopped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flow meters, in particular to a uniform velocity tube flow meter for nuclear power plants. BACKGROUND

[0002] The uniform velocity tube flow meter is a differential pressure flow meter based on the Pitot tube speed measurement principle. The uniform velocity tube flow meter measures the pressure difference between the dynamic pressure upstream of the blocking body and the static pressure downstream, thereby achieving the purpose of measuring the flow. The uniform velocity tube flow meter can measure the flow in the pipeline. The uniform velocity tube flow meter is usually used to measure the flow in the pipeline of a nuclear power plant. The main pipeline can be connected to the orifice valve of the nuclear power plant.

[0003] In related technologies, a branch pipeline is arranged on the main pipeline, and a uniform velocity tube flow meter is arranged in the branch pipeline. The inner tube of the uniform velocity tube flow meter is inserted into the main pipeline to measure the flow in the main pipeline.

[0004] Since the fluid in the main pipeline contains some impurities, long-term use of the uniform velocity tube flow meter for measurement will cause the impurities to block the flow meter. The flow meter can be removed from the branch pipeline only after the main pipeline is shut down, which greatly affects the production efficiency. SUMMARY

[0005] In order to improve the problem that the uniform velocity tube flow meter is not easy to maintain, the present application provides a uniform velocity tube flow meter for nuclear power plants.

[0006] The uniform velocity tube flow meter for nuclear power plants provided by the present application adopts the following technical scheme: A uniform velocity tube flow meter for nuclear power plants includes a branch pipeline and a flow meter. The flow meter is arranged in the branch pipeline. The branch pipeline includes a first pipeline and a second pipeline. The second pipeline is connected to the main pipeline. The first pipeline is located on the side of the second pipeline away from the main pipeline. A first valve is arranged between the first pipeline and the second pipeline. The flow meter is detachably connected to the first pipeline by a fixing member.

[0007] By adopting the above technical scheme, when the flow meter needs to be repaired, the worker first removes the flow meter from the second pipeline, and then blocks the first pipeline and the second pipeline through the first valve. At this time, the flow meter can be directly removed without affecting the main pipeline, so as to realize the repair of the flow meter under the condition that the main pipeline does not stop.

[0008] Optionally, a fixing rod is arranged on the first pipeline. A fixing plate is arranged on the flow meter. A fixing hole is formed in the fixing plate for the fixing rod to pass through. A first fixing block is threadedly connected to the fixing rod. The first fixing block is located on the side of the fixing plate away from the first pipeline.

[0009] By adopting the technical scheme, the staff rotates the first fixed block, and since the first fixed block is located on the side of the fixed plate away from the first pipeline, the first fixed block does not limit the fixed plate, so that the fixed plate can be taken out from the fixed rod, thereby realizing the separation of the flowmeter and the first pipeline; meanwhile, since the first fixed block is located on the side of the fixed plate away from the first pipeline, the first fixed block fixes the flowmeter through the fixed plate, thereby limiting the separation of the flowmeter and the first pipeline.

[0010] Optionally, the fixed rod is threadedly connected with a second fixed block, the second fixed block is located on the side of the fixed plate away from the first fixed block, and the two ends of the fixed plate abut against the first fixed block and the second fixed block respectively.

[0011] By adopting the technical scheme, the staff rotates the second fixed block through the wrench, so that the second fixed block can drive the fixed plate to move on the fixed rod, thereby realizing the separation of the flowmeter and the first pipeline, and the staff does not need to directly pull out the flowmeter, thereby reducing the damage of the flowmeter and facilitating the staff to stably take out the flowmeter from the first pipeline; meanwhile, the two ends of the fixed plate abut against the first fixed block and the second fixed block respectively, so that the fixed plate can be stably located on the fixed rod, thereby further reducing the movement of the fixed plate on the fixed rod.

[0012] Optionally, an annular groove is formed in the inner wall of the first pipeline, and a sealing ring is arranged in the annular groove and abuts against the outer wall of the inner tube of the flowmeter.

[0013] By adopting the technical scheme, the sealing ring is located in the annular groove and abuts against the outer wall of the inner tube of the flowmeter, so that the fluid is not easy to flow out from the gap between the first pipeline and the inner tube of the flowmeter, thereby enhancing the sealing effect between the flowmeter and the first pipeline.

[0014] Optionally, a second valve is arranged on the second pipeline, and a connecting pipeline is arranged between the first valve and the second valve.

[0015] By adopting the technical scheme, the staff first moves the flowmeter, so that the inner tube of the flowmeter moves from the main pipeline to the connecting pipeline, then the staff closes the second valve, so that the second valve limits the fluid in the main valve to continue flowing into the first pipeline, then the staff moves the flowmeter, so that the inner tube of the flowmeter moves from the connecting pipeline to the first pipeline, at this time, the staff closes the first valve, and part of the fluid moving with the flowmeter into the connecting pipeline is not easy to separate from the first pipeline, thereby reducing the possibility of the fluid flowing out of the first pipeline and avoiding the adverse effects of corrosive fluid.

[0016] Optionally, the connecting pipe is provided with a through hole, and a connecting ring is arranged in the through hole.

[0017] By adopting the technical scheme, the staff rotates the connecting ring, and the accommodating groove in the connecting ring is located at the side of the connecting ring close to the ground, so that the fluid can flow from the first pipe into the accommodating groove, and the connecting ring can collect the fluid to reduce the possibility of the fluid separating from the first pipe.

[0018] Optionally, the accommodating groove penetrates the outer wall of the connecting ring, and an accommodating strip is slidably connected in the accommodating groove and can be completely located in the accommodating groove.

[0019] By adopting the technical scheme, the staff slides the accommodating strip, and the accommodating strip is located in the accommodating groove, so that the fluid in the accommodating groove can move from the accommodating groove to the first pipe, so that the inner pipe in the flow meter can push the fluid to move into the main pipe, and the fluid in the accommodating groove will not remain in the accommodating groove for a long time.

[0020] Optionally, the connecting ring is provided with a limiting hole, and a limiting strip is slidably connected in the limiting hole and can be located in the connecting pipe; when the accommodating groove is located at the side of the connecting ring close to the ground, the limiting strip is located at the side of the connecting ring away from the ground.

[0021] By adopting the technical scheme, when the staff takes out the flow meter from the main pipe, the limiting strip is located at the side of the connecting ring away from the ground during the movement of the inner pipe in the flow meter from the second pipe to the first pipe, and when the inner pipe in the flow meter does not abut against the limiting strip, the limiting strip can smoothly fall down, so that the staff can know the position of the flow meter, so as to know that the second valve needs to be closed, and the fluid flowing into the connecting pipe along with the second valve is reduced; because the space in the connecting pipe is relatively closed, the limiting strip falls down due to gravity at this time, so that the air extruded by the limiting strip can move the accommodating strip in the accommodating groove, so that the accommodating strip can be separated from the accommodating groove, and the fluid in the connecting pipe can enter the accommodating groove.

[0022] Optionally, a moving strip is rotatably connected to the connecting ring, and the moving strip is used to limit the protrusion of the accommodating strip from the connecting ring.

[0023] By adopting the technical scheme, the staff rotates the moving strip to limit the protrusion of the accommodating strip from the connecting ring, so that the staff does not need to manually fix the accommodating strip, and at this time the staff can directly clean the fluid from the connecting pipe; or the staff abuts the accommodating strip through the moving strip, so that the accommodating strip can be stably located in the accommodating groove, so that the fluid can be separated from the accommodating groove and flow smoothly into the main pipe.

[0024] To sum up, the present application includes at least one of the following beneficial technical effects: 1. When the flow meter needs to be repaired, the staff first takes the flow meter out of the second pipeline, and then the staff blocks the first pipeline and the second pipeline through the first valve. At this time, the flow meter can be directly taken out without affecting the main pipeline, so as to realize the maintenance of the flow meter under the condition of non-stop of the main pipeline.

[0025] 2. By locating the second fixed block on the side of the fixed plate away from the first fixed block, the staff drives the second fixed block to rotate by using a wrench, so that the second fixed block can drive the fixed plate to move on the fixed rod, so as to realize the separation between the flow meter and the first pipeline. At this time, the staff does not need to directly pull out the flow meter, which reduces the damage of the flow meter and facilitates the staff to take out the flow meter from the first pipeline. At the same time, the two ends of the fixed plate abut against the first fixed block and the second fixed block respectively, so that the fixed plate can be stably located on the fixed rod, further reducing the movement of the fixed plate on the fixed rod. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic diagram of embodiment 1; Figure 2 is a sectional view along Figure 1 A-A line in FIG. 1; Figure 3 is an enlarged schematic diagram of part B in Figure 2 Figure 4 is an enlarged schematic diagram of part C in Figure 2 Figure 5 is a structural schematic diagram of embodiment 2; Figure 6 is a sectional view along Figure 5 D-D line in FIG. 2; Figure 7 is an enlarged schematic diagram of part E in Figure 6 Figure 8 is an enlarged schematic diagram of part F in Figure 6 Figure 9 is a structural schematic diagram of the highlighted moving strip in embodiment 2.

[0027] ​​​​: 1, branch pipe; 11, first pipe; 111, extension plate; 112, fixed rod; 113, ring groove; 114, sealing ring; 12, second pipe; 13, first valve; 14, second valve; 15, connecting pipe; 151, perforation; 2, flowmeter; 21, flow flange; 22, fixed plate; 221, fixed hole; 222, first fixed block; 223, second fixed block; 23, protective sleeve; 231, groove; 24, inner pipe; 241, first detection pipe; 242, second detection pipe; 3, connecting ring; 31, accommodating groove; 311, accommodating strip; 32, limiting hole; 321, limiting strip; 322, weight; 33, moving strip; 331, moving slope. DETAILED DESCRIPTION

[0028] The following will be described in detail in combination with the accompanying drawings. Figures 1-9 The application is further described in detail.

[0029] Embodiment 1 This embodiment discloses a uniform velocity tube flowmeter for nuclear power plant. Referring to Figure 1 A uniform velocity tube flowmeter for nuclear power plant, comprising a branch pipe 1 and a flowmeter 2, the branch pipe 1 is arranged on a main pipe, and the branch pipe 1 is communicated with the main pipe.

[0030] Referring to Figure 1 The branch pipe 1 comprises a first pipe 11 and a second pipe 12, the second pipe 12 is fixedly connected to the main pipe, and the first pipe 11 and the second pipe 12 are bolted with a first valve 13, the first valve 13 can open and close the connection between the first pipe 11 and the second pipe 12.

[0031] Referring to Figure 1 The flowmeter 2 is provided with a fixing member, the fixing member comprises a flow flange 21, the flow flange 21 is fixedly connected to the flowmeter 2, and the flow flange 21 is bolted to the first pipe 11, at this time, part of the structure of the flowmeter 2 can be inserted into the main pipe through the first pipe 11, the first valve 13 and the second pipe 12 in sequence.

[0032] Referring to Figure 1 The first pipe 11 is fixedly connected with an extension plate 111, and the extension plate 111 is threadedly connected with a fixed rod 112, and the fixed rod 112 is a threaded rod. The surface of the flowmeter 2 is fixedly connected with a fixed plate 22, and the fixed plate 22 is provided with a fixed hole 221 for the fixed rod 112 to pass through.

[0033] Referring to Figure 1Two first fixing blocks 222 and two second fixing blocks 223 are threadedly connected on the fixing rod 112. The first fixing blocks 222 and the second fixing blocks 223 are located on both sides of the fixing plate 22, and the other first fixing block 222 and the other second fixing block 223 are located on both sides of the extension plate 111. At this time, the first fixing blocks 222 and the second fixing blocks 223 can limit the movement of the fixing plate 22 and the extension plate 111.

[0034] With reference to Figure 1 and Figure 2 , the worker rotates the first fixing block 222, so that the first fixing block 222 can be separated from the fixing rod 112, and then the worker rotates the second fixing block 223, so that the second fixing block 223 drives the fixing plate 22 to move on the fixing rod 112, so as to facilitate the worker to slowly take out the flowmeter 2 from the second pipeline 12, reducing the damage that may be caused when the flowmeter 2 is taken out.

[0035] With reference to Figure 2 and Figure 3 , the flowmeter 2 is fixedly connected with an inner pipe 24, and the inner pipe 24 can be inserted into the main pipeline. The inner pipe 24 is fixedly connected with a first detection pipeline 241 and a second detection pipeline 242, and an opening is formed on one side of the inner pipe 24, and a plurality of openings are formed on the other side of the inner pipe 24. The fluid directly flows into the first detection pipeline 241 through the opening, and the fluid flows into the second detection pipeline 242 after mixing in the inner pipe 24 through the plurality of openings.

[0036] With reference to Figure 4 , a plurality of ring grooves 113 are formed in the inner wall of the first pipeline 11, and sealing rings 114 are fixedly connected in the ring grooves 113, and the sealing rings 114 abut against the outer wall of the inner pipe 24 in the flowmeter 2, so as to realize the sealing between the first pipeline 11 and the flowmeter 2.

[0037] The implementation principle of the embodiment 1 is that the worker realizes the movement of the flowmeter 2 in the first pipeline 11 through the first fixing block 222 and the second fixing block 223, until the inner pipe 24 in the flowmeter 2 is separated from the first valve 13, at this time the worker closes the first valve 13, and then takes out the flowmeter 2 from the first pipeline 11, so as to facilitate the maintenance of the flowmeter 2.

[0038] Embodiment 2 With reference to Figure 5 and Figure 6 , the difference between this embodiment and the embodiment 1 is that the second valve 14 is detachably connected on the second pipeline 12, the connecting pipeline 15 is arranged between the first valve 13 and the second valve 14, and the second valve 14 is located on the side of the first valve 13 close to the main pipeline.

[0039] With reference to Figure 7A through hole 151 is formed on the outer surface of the connecting pipe 15, and a connecting ring 3 is rotatably connected within the through hole 151. A receiving groove 31 is formed on the inner wall of the connecting ring 3, and the receiving groove 31 extends circumferentially along the connecting ring 3. The receiving groove 31 extends through to the outer wall of the connecting ring 3, and a receiving strip 311 is slidably connected within the receiving groove 31. The receiving strip 311 can be completely located within the receiving groove 31; or the receiving strip 311 can be disengaged from the receiving groove 31, and the receiving strip 311 can protrude from the connecting ring 3.

[0040] Reference Figure 7 A limiting hole 32 is formed on the inner wall of the connecting ring 3, and the limiting hole 32 and the receiving groove 31 are arranged opposite each other along the axial direction of the connecting ring 3. A limiting strip 321 is slidably connected to the wall of the limiting hole 32, and a weight 322 is fixedly connected to the limiting strip 321. The limiting strip 321 can pass through the limiting hole 32 and be inserted into the connecting pipe 15, and the limiting strip 321 can abut against the inner tube 24 of the flow meter 2. The connecting ring 3 can be rotated to adapt to the connecting pipe 15 in different directions, so that the limiting strip 321 is always on top, and there is a rotation sealing ring between the connecting ring 3 and the through hole 151 to increase the sealing performance between the connecting ring 3 and the connecting pipe 15.

[0041] Reference Figure 5 , Figure 7 and Figure 8 A protective sleeve 23 is fitted onto the inner tube 24, extending along the length of the inner tube 24. The length of the protective sleeve 23 is less than the length of the inner tube 24, meaning that the inner tube 24 can be inserted into the main pipe, while the protective sleeve 23 can only be located in the second pipe 12. The protective sleeve 23 is used to prevent wear and tear on the inner tube 24 during movement. A groove 231 is formed on the outer surface of the protective sleeve 23 for the insertion of a limiting strip 321. When the limiting strip 321 is inserted into the groove 231, the inner tube 24 can be disengaged from the second pipe 12, at which point the operator needs to close the second valve 14.

[0042] Reference Figure 5 , Figure 7 and Figure 8 The connecting ring 3 is rotated to the appropriate position, that is, the limiting strip 321 is on the top and the receiving strip 311 is on the bottom. When the operator moves the flow meter 2, the limiting strip 321 can be smoothly inserted into the groove 231. At this time, the inner tube 24 can be disengaged from the second valve 14. The operator can then know that the second valve 14 needs to be closed. Then the operator moves the limiting strip 321 to remove it from the groove 231 before the flow meter 2 can be moved again.

[0043] Reference Figure 5 and Figure 7When the inner tube 24 is disengaged from the connecting pipe 15, the limiting strip 321 falls due to the gravity of the weight 322, and the fluid can drive the receiving strip 311 to move, allowing the receiving strip 311 to disengage from the receiving groove 31, that is, the receiving strip 311 protrudes from the connecting ring 3. At this time, the fluid located in the connecting pipe 15 can be temporarily stored in the receiving groove 31.

[0044] Reference Figure 9 A movable strip 33 is rotatably connected to the outer surface of the connecting ring 3. A movable inclined surface 331 is provided on the inner wall of the movable strip 33. The distance between the movable inclined surface 331 and the connecting ring 3 gradually decreases along the direction from one end of the movable strip 33 to the other end of the movable strip 33. The rotation path of the movable inclined surface 331 intersects the sliding path of the receiving strip 311.

[0045] Reference Figure 5 , Figure 7 and Figure 9 When the receiving strip 311 protrudes from the connecting ring 3, the operator slides the moving strip 33, allowing the moving strip 33 to drive the receiving strip 311 to move through the moving inclined surface 331, so that the receiving strip 311 can be completely located in the receiving groove 31. At this time, the fluid in the receiving groove 31 can flow back to the connecting pipe 15, so as to facilitate subsequent cleaning by the operator or pushing the protective sleeve 23 and inner pipe 24 into the main pipe.

[0046] The implementation principle of Example 2 is as follows: First, the operator moves the flow meter 2 so that the limiting strip 321 can fall smoothly into the groove 231. At this time, the operator needs to close the second valve 14. Then, the operator moves the limiting strip 321 and continues to move the flow meter 2 until the inner tube 24 is disengaged from the connecting pipe 15. During this process, the limiting strip 321 falls down twice and is inserted into the connecting pipe 15. The limiting strip 321 can fall down and the fluid in the connecting pipe 15 can be stored in the receiving tank 31. After that, the operator closes the first valve 13. Finally, the operator takes out the flow meter 2 for maintenance or replacement.

[0047] 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 "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and 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.

[0048] 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 uniform velocity tube flowmeter for nuclear power plants, comprising a dividing duct (1) and a flowmeter (2) arranged in the dividing duct (1), characterized in that: The sub-pipe (1) comprises a first pipe (11) and a second pipe (12), the second pipe (12) communicates with the main pipe, the first pipe (11) is located on the side of the second pipe (12) away from the main pipe, a first valve (13) is arranged between the first pipe (11) and the second pipe (12), and the flow meter (2) is detachably connected to the first pipe (11) through a fixing piece.

2. A nuclear power plant's flowmeter of the type described in claim 1, characterized in that: A fixing rod (112) is arranged on the first pipe (11), a fixing plate (22) is arranged on the flow meter (2), a fixing hole (221) for the fixing rod (112) to pass through is arranged on the fixing plate (22), a first fixing block (222) is threadedly connected to the fixing rod (112), and the first fixing block (222) is located on the side of the fixing plate (22) away from the first pipe (11).

3. A nuclear power plant's flowmeter of the type described in claim 2, characterized in that: A second fixing block (223) is threadedly connected to the fixing rod (112), the second fixing block (223) is located on the side of the fixing plate (22) away from the first fixing block (222), and the two ends of the fixing plate (22) abut against the first fixing block (222) and the second fixing block (223) respectively.

4. A nuclear power plant's flowmeter of the type described in claim 1, characterized in that: An annular groove (113) is arranged on the inner wall of the first pipe (11), a sealing ring (114) is arranged in the annular groove (113), and the sealing ring (114) abuts against the outer wall of an inner pipe (24) in the flow meter (2).

5. A nuclear power plant's flowmeter of the type described in claim 1, characterized in that: A second valve (14) is arranged on the second pipe (12), and a connecting pipe (15) is arranged between the first valve (13) and the second valve (14).

6. A nuclear power plant's flowmeter of the type described in claim 5, characterized in that: A through hole (151) is arranged on the connecting pipe (15), a connecting ring (3) is arranged in the through hole (151), an accommodating groove (31) is arranged on the inner wall of the connecting ring (3), and the accommodating groove (31) communicates with the connecting pipe (15).

7. A nuclear power plant's flowmeter of the type described in claim 6, characterized in that: The accommodating groove (31) penetrates to the outer wall of the connecting ring (3), an accommodating strip (311) is slidably connected in the accommodating groove (31), and the accommodating strip (311) can be completely located in the accommodating groove (31).

8. A nuclear power plant's flowmeter of the type described in claim 7, characterized in that: A limiting hole (32) is arranged on the connecting ring (3), a limiting strip (321) is slidably connected in the limiting hole (32), and the limiting strip (321) can be located in the connecting pipe (15); when the accommodating groove (31) is located on the side of the connecting ring (3) close to the ground, the limiting strip (321) is located on the side of the connecting ring (3) away from the ground.

9. A nuclear power plant's flowmeter of the type described in claim 8, characterized in that: A moving strip (33) is rotatably connected to the connecting ring (3), and the moving strip (33) is used for limiting the accommodating strip (311) from protruding out of the connecting ring (3).

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