System and method for detecting overall air tightness of suction bucket

Abstract

The invention discloses a system and method for detecting the overall airtightness of a suction bucket, and the system comprises a water tank, a water supply device for injecting water into the water tank, a vacuumizing device connected with the top of a suction bucket main body, and a pressure detection assembly. The vacuumizing device vacuumizes the interior of the suction bucket body, and the pressure detection assembly monitors the vacuum pressure in the suction bucket body. The air tightness detection device has the effect of conveniently detecting the overall air tightness of the suction bucket.

Description

Technical Field

[0001] The present application relates to the field of offshore wind turbine foundations, and in particular to a system and method for detecting the overall air tightness of a suction bucket. Background Art

[0002] As a form of offshore wind turbine foundation, the suction bucket jacket foundation is widely used due to its high efficiency, strong adaptability and characteristics. During the construction process, the suction bucket jacket foundation is uniformly and steadily sunk into the seabed mud layer. During the sinking process, the water in the suction bucket is continuously sucked by the water pump, thereby forming a pressure difference between the inside and outside of the bucket to achieve a state close to negative pressure vacuum, and finally the bucket body is uniformly penetrated into the mud.

[0003] The airtightness of the suction bucket is one of the important guarantee measures in the entire suction bucket conductor frame foundation sinking process. As a large-volume component, if the suction bucket body has defects in its airtightness, it may cause the entire fan foundation to tilt or fail to sink, which will have a significant impact on the efficiency and quality of subsequent installation projects, and even directly affect the normal use and safe operation of the project. Therefore, it is necessary to conduct airtightness testing of the suction bucket to ensure that it can be smoothly sunk into place during the construction process. Due to the large volume of the suction bucket, conventional airtightness testing equipment cannot be applied, so there is still room for improvement. Summary of the invention

[0004] In order to facilitate the detection of the overall air tightness of the suction bucket, the present application provides a system and method for detecting the overall air tightness of the suction bucket.

[0005] The present application provides a system and method for detecting the overall air tightness of a suction bucket using the following technical solutions: A system for detecting the overall air tightness of a suction bucket comprises a water tank, a water supply device for filling water into the water tank, a vacuum device connected to the top of the suction bucket body, and a pressure detection component. When performing an air tightness test, the suction bucket body is placed in the water tank with its opening facing downward, the vacuum device vacuums the interior of the suction bucket body, and the pressure detection component monitors the vacuum pressure inside the suction bucket body.

[0006] By adopting the above technical scheme, the suction barrel body is hoisted into the test water tank and placed stably, and water is poured into the water tank by using the water supply device until the water level in the water tank reaches a certain height. The vacuum device is started to extract the air inside the suction barrel body, and water is continuously added to the water tank. The vacuum is pumped until the vacuum pressure inside the suction barrel body reaches a preset value. The vacuum pressure inside the suction barrel is monitored in real time by the pressure detection device. When the pressure value can be maintained for a period of time without changing, the test is qualified. If there is a change, the test is unqualified. The leak is found, repaired and retested until the test is qualified. This can not only meet the inspection requirements of large suction barrel bodies, but also has the advantage of convenient operation, which is conducive to repeated testing, so as to quickly achieve the purpose of air tightness detection and timely correction.

[0007] Preferably, the vacuum extraction device includes a vacuum pump, a connecting pipe connected between the vacuum pump and the suction barrel body, a valve connected to the connecting pipe, and a sealing plate connected between the connecting pipe and the suction barrel body.

[0008] By adopting the above technical solution, when installing the vacuum device, it is necessary to open a hole at the connection between the suction barrel body and the connecting pipe, and then seal the connection between the connecting pipe and the suction barrel body through a sealing plate. The sealing plate can also be used as an installation position for the valve to facilitate the assembly of the vacuum device.

[0009] Preferably, it also includes an exhaust device for releasing tracer gas to the outer peripheral side of the suction bucket body and a detection instrument for detecting the tracer gas inside the suction bucket body, and the exhaust device can slide up and down outside the suction bucket body.

[0010] By adopting the above technical scheme, when the leakage point of the suction barrel body is found, the position of the exhaust device is moved to adjust the discharge height of the tracer gas, so as to realize the layer-by-layer investigation of the leakage position of the large suction barrel body. The exhaust device releases the tracer gas on the outer periphery of the suction barrel body, and then under the suction action of the vacuum device, a pressure difference is formed inside and outside the suction barrel body, and the tracer gas enters the suction barrel from the outside of the suction barrel body. The detection instrument detects the tracer gas entering the suction barrel body. When the detection instrument detects the presence of tracer gas inside the suction barrel body, the position of the suction barrel body near the exhaust device can be repaired in time. When the exhaust device moves to the top of the suction barrel body, the leakage point investigation is completed.

[0011] Preferably, the exhaust device includes an air storage box for storing tracer gas, an exhaust pump connected to the air storage box, an exhaust pipe connected to the exhaust pump, an annular pipe connected to the exhaust pipe and surrounding the outer circumference of the suction bucket body, and a plurality of branch pipes connected to the annular pipe, wherein the plurality of branch pipes are distributed along the surrounding direction of the annular pipe, and the tracer gas is ejected after passing through the exhaust pipe, the annular pipe and the branch pipes in sequence under the pumping action of the exhaust pump.

[0012] By adopting the above technical solution, the tracer gas is ejected after passing through the exhaust pipe, the annular pipe and the branch pipe in sequence under the pumping action of the exhaust pump. The tracer gas surrounds the outer peripheral side of the suction bucket body, thereby covering the suction bucket body detection area to facilitate the detection of leakage points.

[0013] Preferably, an annular baffle is arranged above the annular tube and surrounds the outer circumference of the suction bucket body, a gap is left between the annular baffle and the annular tube, the branch pipe is arranged vertically upward, and the annular baffle moves synchronously with the annular tube.

[0014] By adopting the above technical solution, an annular baffle is arranged above the annular tube to form a barrier for the tracer gas, so as to isolate the tracer gas in a certain area, so as to achieve the purpose of detecting leakage points in the upper and lower areas of the suction barrel body, so as to facilitate the investigation of leakage points.

[0015] Preferably, the annular baffle is provided with a lifting lug.

[0016] By adopting the above technical solution, a lifting lug is provided at the annular baffle plate to facilitate connection with a lifting device, so that the lifting device can be used to drive the annular baffle plate and the annular tube to move up and down synchronously.

[0017] Preferably, the tracer gas in the gas storage box is mixed with a fluorescent agent.

[0018] By adopting the above technical solution, the fluorescent agent and the tracer gas are mixed in a closed container, and fully stirred or shaken, and then introduced into the gas storage box to ensure that the two are fully in contact and evenly mixed. The fluorescent agent molecules will move with the flow of the tracer gas. The fluorescent agent molecules are illuminated by an appropriate light source to emit fluorescence, and the movement trajectory and distribution of the fluorescent agent molecules are observed, so as to infer the flow direction and flow state of the gas, so as to determine the specific leak point location, which is conducive to improving the accuracy and efficiency of leak point detection.

[0019] A method for detecting the overall air tightness of a suction bucket, using a detection system for the overall air tightness of a suction bucket, comprises the following steps: Lift the suction barrel body into the test water tank and place it steadily, then use the water supply device to fill water into the water tank until the water level in the water tank reaches a certain height, start the vacuum device to extract the air inside the suction barrel body, and continuously add water to the water tank, vacuum until the vacuum pressure inside the suction barrel body reaches the preset value, and monitor the vacuum pressure inside the suction barrel in real time through the pressure detection device. When the pressure value of the pressure detection device can be maintained unchanged for a period of time, the air tightness test of the suction barrel body is qualified. When the pressure value changes, the air tightness test of the suction barrel body fails. Then find out the leakage point of the suction barrel body, repair it and test it again until it passes the test.

[0020] By adopting the above technical solution, it can not only meet the inspection requirements of the large suction bucket body, but also has the advantage of convenient operation, which is conducive to repetitive testing, so as to quickly achieve the purpose of air tightness detection and timely correction.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The suction barrel body is hoisted into the test water tank and placed stably. Then, water is added into the water tank by the water supply device until the water level in the water tank reaches a certain height. The vacuum device is started to extract the air inside the suction barrel body. At the same time, water is continuously added into the water tank. The vacuum is drawn until the vacuum pressure inside the suction barrel body reaches a preset value. The vacuum pressure inside the suction barrel is monitored in real time by the pressure detection device. When the pressure value of the pressure detection device can remain unchanged for a period of time, the air tightness test of the suction barrel body is qualified. When the pressure value changes, the air tightness test of the suction barrel body is unqualified. Then, the leakage point of the suction barrel body is found out, and the test is repeated after repairing and patching until the test is qualified. This can not only meet the inspection requirements of large suction barrel bodies, but also has the advantages of convenient operation, which is conducive to repeated tests, so as to quickly achieve the purpose of air tightness detection and timely correction. 2. When the leakage point of the suction bucket body is found, the position of the exhaust device is moved to adjust the discharge height of the tracer gas, so as to realize the layer-by-layer investigation of the leakage position of the large suction bucket body. The exhaust device releases the tracer gas on the outer periphery of the suction bucket body, and then under the suction action of the vacuum device, a pressure difference is formed inside and outside the suction bucket body, and the tracer gas enters the suction bucket from the outside of the suction bucket body. The detection instrument detects the tracer gas entering the suction bucket body. When the detection instrument detects that there is tracer gas inside the suction bucket body, the position of the suction bucket body near the exhaust device can be repaired in time. When the exhaust device moves to the top of the suction bucket body, the leakage point investigation is completed; 3. An annular baffle is arranged above the annular tube to form a barrier for the tracer gas, so as to isolate the tracer gas in a certain area, so as to achieve the purpose of detecting the leakage point in the upper and lower areas of the suction bucket body, so as to facilitate the investigation of the leakage point; 4. By mixing the fluorescent agent and the tracer gas in a closed container, stirring or oscillating them fully, and then passing them into the gas storage box to ensure that the two are fully in contact and evenly mixed, the fluorescent agent molecules will move with the flow of the tracer gas. By irradiating the fluorescent agent molecules with an appropriate light source to make them fluoresce, and observing the movement trajectory and distribution of the fluorescent agent molecules, the flow direction and flow state of the gas can be inferred to determine the specific leak location, which is conducive to improving the accuracy and efficiency of leak detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the overall structure of a system for detecting the overall air tightness of a suction bucket according to an embodiment of the present application.

[0023] Explanation of the accompanying drawings: 1. water tank; 2. suction bucket body; 3. vacuum device; 4. water supply device; 5. exhaust device; 51. air storage box; 52. exhaust pump; 53. exhaust pipe; 54. annular pipe; 55. branch pipe; 6. annular baffle; 7. connecting rod. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 This application is described in further detail.

[0025] The present application embodiment discloses a system for detecting the overall air tightness of a suction bucket, referring to Figure 1 , including a water tank 1, a water supply device 4 for filling water into the water tank 1, a vacuum device 3 connected to the top of the suction bucket body 2, and a pressure detection component.

[0026] In this embodiment, the water supply device 4 includes a water supply tank, a water supply pump connected to the water supply tank, and a water pipe connected to the water supply pump, and the water pipe extends into the water tank 1. The suction barrel body 2 is a cylindrical structure with an opening at the bottom. The water tank 1 is spliced ​​with a steel plate with a thickness of 5-8 mm. The diameter of the water tank 1 is 14500 mm and the height is 750 mm. A reinforcing plate is arranged on the inner wall of the water tank 1, and the whole is overlapped and single-sided welded. When performing an air tightness test, the suction barrel body 2 is placed in the water tank 1 with the opening facing downward. The vacuum device 3 includes a vacuum pump, a connecting pipe connected between the vacuum pump and the suction barrel body 2, a valve connected to the connecting pipe, and a sealing plate connected between the connecting pipe and the suction barrel body 2. The connecting pipe is a pressure-resistant rubber hose. When installing the vacuum device 3, a hole is opened at the top of the suction barrel body 2, and then a steel pipe is inserted into the hole and welded to fix. The sealing plate uses a 10mm steel plate, and the sealing plate seals the hole. Then a hole is opened at the sealing plate and a valve is installed. The valve is connected to the connecting pipe, so that the inside of the suction barrel body 2 is connected to the vacuum pump. In this embodiment, the pressure detection device is specifically a pressure gauge installed at the vacuum pump. When performing an airtightness test, the vacuum device 3 vacuums the inside of the suction barrel body 2, and the pressure detection component monitors the vacuum pressure inside the suction barrel body 2, thereby achieving the purpose of detecting the airtightness of the suction barrel body 2.

[0027] In this embodiment, a system for detecting the overall air tightness of a suction bucket further includes an exhaust device 5 for releasing tracer gas to the outer peripheral side of the suction bucket body 2 and a detection instrument for detecting the tracer gas inside the suction bucket body 2, and the exhaust device 5 can slide up and down outside the suction bucket body 2. Among them, the tracer gas adopts a fixed helium detector or a helium mass spectrometer leak detector commonly used for helium detection. The helium detector can be installed on the inner wall of the suction bucket body 2 or at the exhaust port of a vacuum pump, and is mainly used to detect whether the suction bucket body 2 contains tracer gas. The helium detector is connected to the controller for communication so that the detection personnel can observe the helium detector data in real time.

[0028] The exhaust device 5 includes a gas storage box 51 for storing tracer gas, an exhaust pump 52 connected to the gas storage box 51, an exhaust pipe 53 connected to the exhaust pump 52, an annular pipe 54 connected to the exhaust pipe 53 and surrounding the outer periphery of the suction barrel body 2, and a plurality of branch pipes 55 connected to the annular pipe 54. The plurality of branch pipes 55 are distributed along the surrounding direction of the annular pipe 54. An annular baffle 6 surrounding the outer periphery of the suction barrel body 2 is arranged above the annular pipe 54. A gap is left between the annular baffle 6 and the annular pipe 54. The gap between the annular baffle 6 and the annular pipe 54 serves as an airtightness detection area. The branch pipe 55 is vertically arranged upward. The annular baffle 6 and the annular pipe 54 are fixed by a connecting rod 7, so as to achieve the purpose of synchronous movement of the two. Under the pumping action of the exhaust pump 52, the tracer gas passes through the exhaust pipe 53, the annular pipe 54 and the branch pipe 55 in sequence and then is ejected. The tracer gas surrounds the outer periphery of the suction barrel body 2 and covers the detection area of ​​the suction barrel body 2 under the partition of the annular baffle 6. Under the suction action of the vacuum device 3, a pressure difference is formed inside and outside the suction barrel main body 2, and the tracer gas enters the suction barrel from the outside of the suction barrel main body 2. The detection instrument detects the tracer gas entering the suction barrel main body 2. When the detection instrument detects the presence of tracer gas inside the suction barrel main body 2, the position of the suction barrel main body 2 near the exhaust device 5 can be repaired in time.

[0029] In this embodiment, a plurality of lifting ears (not shown in the figure) are fixed on the top of the annular baffle 6, and the plurality of lifting ears are circumferentially distributed on the circumferential side of the annular baffle 6 to facilitate the connection between the annular baffle 6 and the lifting equipment. The annular baffle 6 and the annular tube 54 are driven up and down synchronously by the lifting equipment, thereby adjusting the height of the air tightness detection area and the tracer gas discharge position, so as to facilitate the layer-by-layer inspection of the leakage position of the large suction bucket body 2.

[0030] In order to improve the accuracy and efficiency of leak detection of suction bucket air tightness, the fluorescent agent and the tracer gas are mixed in a closed container, stirred or shaken fully, and then introduced into the gas storage box 51 to ensure that the two are fully in contact and mixed evenly. The fluorescent agent molecules will move with the flow of the tracer gas, and then the fluorescent agent molecules are illuminated by an appropriate light source to emit fluorescence, and the movement trajectory and distribution of the fluorescent agent molecules are observed, so as to infer the flow direction and flow state of the tracer gas, so as to determine the specific leak location, so that the construction personnel can repair the leak in time.

[0031] The embodiment of the present application also discloses a method for detecting the overall air tightness of a suction bucket, which uses a detection system for the overall air tightness of a suction bucket, including the following steps: First, use a crawler crane or other lifting equipment to connect to the temporary lifting lug on the top of the suction bucket body 2 and hoist the suction bucket body 2 into the water tank 1 and place it stably. Then use the water supply device 4 to fill water into the water tank 1 until the water level in the water tank 1 reaches a certain height, until the water level in the water tank 1 reaches 600mm.

[0032] Then connect the vacuum pump, the connecting pipe and the suction barrel body 2, start the vacuum device 3 to extract the air inside the suction barrel body 2, and at the same time, the water supply device 4 continuously replenishes water into the water tank 1, and vacuumizes until the vacuum pressure inside the suction barrel body 2 reaches the preset value of 0.05MPa, and then stands for 5 minutes. After the pressure inside the suction barrel body 2 stabilizes, adjust the vacuum pressure inside the suction barrel body 2 to 0.05MPa, and maintain the pressure for 1 hour. After maintaining the pressure for 1 hour, the vacuum pressure inside the suction barrel is monitored in real time by the pressure detection device. When the pressure value of the pressure detection device can be maintained for a period of time without change, the air tightness test of the suction barrel body 2 is qualified. During the test, the barrel wall of the suction barrel should be monitored in real time to see if it is deformed. If deformation occurs, the test should be stopped in time. After the test is qualified, open the valve to allow air to slowly enter the suction barrel body 2, and use the water pump to continuously discharge the water in the water tank 1. After there is no pressure difference between the inside and outside of the suction barrel body 2, remove the blocking plate and pipeline, and move the suction barrel body 2 out of the water tank 1.

[0033] When the pressure value changes, the air tightness test of the suction bucket main body 2 fails. Then find out the leakage point of the suction bucket main body 2, repair it and retest it until it passes the test.

[0034] When the leak of the suction bucket body 2 is identified and repaired, the annular tube 54 and the annular baffle 6 are mounted on the outer periphery of the suction bucket body 2 by means of a lifting device (the annular tube 54 and the annular baffle 6 can be installed in advance before the air tightness detection step). The gap between the annular baffle 6 and the annular tube 54 serves as an airtightness detection area. The tracer gas containing fluorescent agent is ejected through the exhaust pipe 53, the annular tube 54 and the branch pipe 55 in sequence under the pumping action of the exhaust pump 52. The tracer gas surrounds the outer peripheral side of the suction barrel body 2 and covers the detection area of ​​the suction barrel body 2 under the isolation of the annular baffle 6. Under the suction action of the vacuum device 3, a pressure difference is formed between the inside and outside of the suction barrel body 2. The tracer gas enters the inside of the suction barrel body 2 from the outside of the suction barrel body 2. The detection instrument detects the tracer gas entering the inside of the suction barrel body 2. When the detection personnel observe that the detection instrument detects the presence of tracer gas inside the suction barrel body 2, the flow direction of the tracer gas containing fluorescent agent in the detection area is observed to determine the leakage point, and the position of the suction barrel body 2 near the exhaust device 5 is repaired in time.

[0035] By moving the lifting equipment upward, the annular baffle 6 and the annular tube 54 are driven to move up and down synchronously, thereby adjusting the height of the air tightness detection area and the tracer gas discharge position to check the leakage position of the large suction bucket body 2 layer by layer.

[0036] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for detecting the overall air tightness of a suction bucket, characterized by: The invention comprises a water tank (1), a water supply device (4) for injecting water into the water tank (1), a vacuum device (3) connected to the top of a suction bucket body (2), and a pressure detection component. When performing an airtightness test, the suction bucket body (2) is placed in the water tank (1) with its opening facing downward, the vacuum device (3) vacuums the interior of the suction bucket body (2), and the pressure detection component monitors the vacuum pressure inside the suction bucket body (2).

2. A system for detecting the overall air tightness of a suction bucket according to claim 1, characterized in that: The vacuum extraction device (3) comprises a vacuum pump, a connecting pipe connected between the vacuum pump and the suction bucket body (2), a valve connected to the connecting pipe, and a sealing plate connected between the connecting pipe and the suction bucket body (2).

3. A system for detecting the overall air tightness of a suction bucket according to claim 1, characterized in that: It also includes an exhaust device (5) for releasing tracer gas toward the outer peripheral side of the suction bucket body (2) and a detection instrument for detecting the tracer gas inside the suction bucket body (2); the exhaust device (5) can slide up and down outside the suction bucket body (2).

4. A system for detecting the overall air tightness of a suction bucket according to claim 3, characterized in that: The exhaust device (5) comprises an air storage box (51) for storing tracer gas, an exhaust pump (52) connected to the air storage box (51), an exhaust pipe (53) connected to the exhaust pump (52), an annular pipe (54) connected to the exhaust pipe (53) and surrounding the outer periphery of the suction bucket body (2), and a plurality of branch pipes (55) connected to the annular pipe (54), wherein the plurality of branch pipes (55) are distributed along the surrounding direction of the annular pipe (54), and the tracer gas is ejected after passing through the exhaust pipe (53), the annular pipe (54) and the branch pipes (55) in sequence under the pumping action of the exhaust pump (52).

5. A system for detecting the overall air tightness of a suction bucket according to claim 4, characterized in that: An annular baffle (6) is arranged above the annular tube (54) and surrounds the outer circumference of the suction bucket body (2). A gap is left between the annular baffle (6) and the annular tube (54). The branch tube (55) is arranged vertically upward, and the annular baffle (6) moves synchronously with the annular tube (54).

6. A system for detecting the overall air tightness of a suction bucket according to claim 5, characterized in that: The annular baffle (6) is provided with a lifting lug.

7. A system for detecting the overall air tightness of a suction bucket according to claim 4, characterized in that: The tracer gas in the gas storage box (51) is mixed with the fluorescent agent.

8. A method for detecting the overall air tightness of a suction bucket, using a system for detecting the overall air tightness of a suction bucket as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: First, the suction barrel body (2) is hoisted into the test water tank (1) and placed stably. Then, water is added to the water tank (1) by using the water supply device (4) until the water level in the water tank (1) reaches a certain height. Then, the vacuum device (3) is started to extract the air inside the suction barrel body (2). At the same time, the water supply device (4) continuously replenishes water into the water tank (1). The vacuum is drawn until the vacuum pressure inside the suction barrel body (2) reaches a preset value. The vacuum pressure inside the suction barrel is monitored in real time by the pressure detection device. When the pressure value of the pressure detection device can remain unchanged for a period of time, the air tightness test of the suction barrel body (2) is qualified. When the pressure value changes, the air tightness test of the suction barrel body (2) is unqualified. Then, the leakage point of the suction barrel body (2) is found, and the leakage is repaired and retested until the test is qualified.

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