Device and method for detecting underwater check valve

Abstract

The invention discloses a device and a method for detecting an underwater check valve, and relates to the technical field of detection equipment, the device for detecting the underwater check valve comprises a detection cover, a drainage pressure regulating device, a pressure sensor, a camera and a data acquisition system, one side of the detection cover is open, and the other side of the detection cover is open; the detection cover is used for being buckled on the wall face of a channel and covering a check valve to be detected, a closed detection cavity is formed between the detection cover and the wall face of the channel, and the drainage pressure adjusting device is used for discharging water in the detection cavity and adjusting the air pressure in the detection cavity. The pressure sensor and the camera are both arranged in the detection cover, the pressure sensor and the camera are both in communication connection with the data acquisition system, and the data acquisition system is used for acquiring and displaying information acquired by the pressure sensor and the camera. The performance of the check valve can be conveniently detected in situ.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and particularly relates to a device and method for detecting an underwater check valve. Background Art

[0002] Gravity flow water conveyance in open channels is one of the most common water conveyance methods in major water diversion projects in China, often spanning hundreds or thousands of kilometers for water resource allocation. Due to different hydrogeological conditions, when crossing high groundwater level areas, it is easy to cause slope instability due to the reduction of the strength of the channel slope soil mass when encountering water, or the concrete lining slab at the bottom of the channel is jacked and damaged under the action of large water pressure, threatening the safety of channel water conveyance.

[0003] Using internal drainage of check valves is an effective measure to solve the problem of high groundwater level. It can not only prevent the leakage of canal water, but also enable the groundwater to flow out spontaneously in a timely manner. However, this method has high requirements for the reliability of check valves. When the groundwater level is higher than the canal water level, the valve should be opened in time to drain the groundwater into the canal; when the groundwater level is lower than the canal water level, the valve should be closed in time to prevent the leakage of canal water. At present, for example, in the main canal of the Middle Route of the South-to-North Water Diversion Project, spherical check valves, flap check valves, and differential pressure amplification check valves are mainly used. However, the check valves are installed underwater, and the canal is supplied with water continuously throughout the year. Silt, mussels, etc. in the water will cause the blockage or even damage of the check valves, and then lead to the failure of the check valves, affecting the safety of canal water supply.

[0004] At present, the detection of canal check valves is mainly carried out by divers and underwater robots to check the appearance of the check valves to determine whether the structure of the check valves is complete, such as whether the water stop ball of the ball check valve is damaged or lost, whether the flap structure is complete, etc. If the structure is incomplete, it is determined that the check valve fails. However, for the situation where the appearance structure is complete, but the opening and closing drainage function is lost or the inside of the valve body is blocked, the existing appearance inspection method cannot make a judgment, and it is necessary to specifically construct the internal and external pressure difference of the check valve to detect the performance of the check valve. However, there is no corresponding detection device and method at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for detecting an underwater check valve to solve the problems existing in the above-mentioned prior art and facilitate the in-situ detection of the performance of the check valve.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The present invention provides a device for detecting an underwater check valve, comprising: a detection cover, a drainage and pressure regulating device, a pressure sensor, a camera and a data acquisition system. One side of the detection cover is open, and the detection cover is used for buckling on the channel wall surface to cover the check valve to be detected. A sealed detection cavity is formed between the detection cover and the channel wall surface. The drainage and pressure regulating device is used for discharging the water in the detection cavity and regulating the air pressure in the detection cavity. The pressure sensor and the camera are both arranged in the detection cover, and both the pressure sensor and the camera are communicatively connected to the data acquisition system. The data acquisition system is used for collecting the information obtained by the pressure sensor and the camera and displaying it.

[0008] Preferably, it further comprises a fixing cover. One side of the fixing cover is open, and the detection cover is fixedly arranged in the fixing cover. The opening side edges of the fixing cover and the detection cover are located on the same plane. The fixing cover is used for buckling on the channel wall surface, and the drainage and pressure regulating device can also discharge all or part of the water in the fixing cover.

[0009] Preferably, annular gaskets are fixedly arranged on the opening side edges of the fixing cover and the detection cover.

[0010] Preferably, both the fixing cover and the detection cover are spherical crown-shaped structures.

[0011] Preferably, the drainage and pressure regulating device comprises an air pump and a water pumping and exhaust device. The water pumping and exhaust device and the air pump cooperate to discharge the water in the detection cavity and the fixing cover. The air pump is used for inflating and pressurizing the detection cavity, and the water pumping and exhaust device is also used for discharging the gas in the detection cavity and the fixing cover to reduce the pressure.

[0012] Preferably, it further comprises a four-way valve and two water-gas connecting pipes. One ends of the two water-gas connecting pipes are respectively arranged in the detection cover and the fixing cover, and the other ends of the two water-gas connecting pipes are communicated with the air pump and the water pumping and exhaust device through the four-way valve.

[0013] Preferably, two handles are arranged outside the fixing cover.

[0014] The present invention also provides a method for detecting an underwater check valve, comprising: a preparation process: constructing a sealed detection cavity outside the check valve to be detected; pumping out the water in the detection cavity;

[0015] A detection process: regulating the air pressure in the detection cavity and observing the water outlet condition and the pressure change condition of the check valve to judge whether the function of the check valve is normal.

[0016] Preferably, during the detection process, the detection cavity is first inflated to increase the pressure to the set pressure value. If the pressure in the detection cavity can be maintained stable or decrease stably but the amplitude does not exceed the set threshold after the pressure is applied, it is determined that the water stop ability of the check valve is normal;

[0017] The gas in the detection cavity is discharged to a pressure lower than the standard atmospheric pressure; the camera is used to observe whether water flows out of the check valve during the pressure reduction process, and then the opening ability of the check valve is judged in combination with the pressure change situation and the groundwater level situation.

[0018] Preferably, when using the device for detecting the underwater check valve as described above to detect the check valve, the steps of constructing the detection cavity during the preparation process include:

[0019] The fixing cover and the detection cover are buckled on the channel wall surface, and the water in the fixing cover is pumped out to fix the fixing cover and the detection cover on the channel wall surface by using the water pressure.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] (1) On the basis of the structural shape detection of the check valve, the present invention realizes the underwater detection of the working performances such as the opening and closing and drainage of the check valve under the condition that the channel does not stop water, and can comprehensively master the state of the check valve, providing an accurate basis for evaluating the stability of the channel and the subsequent maintenance and replacement of the check valve.

[0022] (2) The present invention fixes the detection cover on the channel wall surface by setting a fixing cover, and the fixing method is simple and easy to implement.

[0023] (3) After the detection is completed, the purpose of separating the fixing cover and the detection cover from the channel wall surface can be achieved by inflating and filling water into the fixing cover to pressurize, and the operation is simple and the detection efficiency is high;

[0024] (4) This device can be integrally installed on an underwater mobile robot platform to realize unmanned detection, reduce the detection cost and improve the detection efficiency. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the device for detecting the underwater check valve provided by the embodiment of the present invention;

[0027] Figure 2 ForFigure 1 Cross-sectional view of the underwater component;

[0028] Figure 3 is Figure 1 Top view of the underwater component;

[0029] Figure 4 Schematic diagram when pumping and decompressing the water in the fixed cover;

[0030] Figure 5 Schematic diagram for pressurizing and draining the detection cavity;

[0031] Figure 6 Schematic diagram for evacuating and decompressing the detection cavity;

[0032] In the figure: 1 - underwater component; 2 - above-water component; 3 - connecting pipeline; 4 - fixed cover; 5 - detection cover; 6 - pipeline connection port; 7 - pressure sensor; 8 - camera; 9 - data acquisition system; 10 - air inflation pump; 11 - pumping and exhaust device; 12 - pressure control system; 13 - water-gas connecting pipe; 14 - transmission line; 15 - gasket; 16 - water-gas connection port; 17 - handle; 18 - circuit connection port; 19 - drainage and pressure regulating inner pipe; 100 - check valve. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Next, in conjunction with Figures 1 to 6 , the embodiments of the present invention will be described.

[0036] The present invention provides a device for detecting an underwater check valve, including: a detection cover 5, a drainage and pressure regulating device, a pressure sensor 7, a camera 8, and a data acquisition system 9. One side of the detection cover 5 is open. The detection cover 5 is used to buckle on the channel wall surface and cover the check valve 100 to be detected. A sealed detection cavity is formed between the detection cover 5 and the channel wall surface. The drainage and pressure regulating device is used to drain the water in the detection cavity and adjust the air pressure in the detection cavity. The pressure sensor 7 and the camera 8 are both arranged in the detection cover 5. The pressure sensor 7 and the camera 8 are both communicatively connected to the data acquisition system 9. The data acquisition system 9 is used to collect the information obtained by the pressure sensor 7 and the camera 8 and display it.

[0037] The usage process is as follows: Snap the detection cover 5 onto the channel wall surface to cover the check valve 100 to be detected. First, use the drainage and pressure regulating device to completely drain the water in the detection cavity, and then control the drainage and pressure regulating device to adjust the air pressure in the detection cavity so that a pressure difference is generated on both sides of the check valve 100. Under normal conditions, when the air pressure inside the check valve 100 (i.e., in the detection cavity) is greater than the pressure outside the check valve 100, due to the check function of the check valve 100, the pressure difference on both sides will remain stable or decrease steadily, but the decreasing amplitude is small; when the air pressure inside the check valve 100 (i.e., in the detection cavity) is less than the pressure outside the check valve 100, the fluid outside the check valve 100, such as groundwater or gas, will flow into the detection cavity through the check valve, and the pressure difference on both sides will gradually become smaller or it can be observed that there is water flowing out inside the check valve 100. Otherwise, the check valve 100 is in a damaged state.

[0038] Therefore, the device for detecting an underwater check valve provided by the embodiment of the present invention realizes the underwater detection of the opening and closing, drainage and other working performances of the check valve under the condition that the channel does not stop water, and thus can comprehensively master the state of the check valve, providing an accurate basis for evaluating the stability of the channel and the subsequent maintenance and replacement of the check valve.

[0039] In some embodiments, the embodiment of the present invention further includes a fixing cover 4. One side of the fixing cover 4 is open, the detection cover 5 is fixedly arranged inside the fixing cover 4, the opening side edges of the fixing cover 4 and the detection cover 5 are located on the same plane, the fixing cover 4 is used for snapping onto the channel wall surface, and the drainage and pressure regulating device can also drain all or part of the water inside the fixing cover 4.

[0040] The present invention fixes the detection cover 5 on the channel wall surface by setting the fixing cover 4, and the fixing method is simple and feasible.

[0041] The fixing process is as follows:

[0042] After the diver inspects the appearance of the check valve, locate the check valve with a complete appearance to be detected, cover the detection cover 5 on the check valve so that the detection cavity can completely cover the check valve inside; the diver assists in pressing the fixing cover 4, and the pressure control system 12 on the shore controls the drainage and pressure regulating device to pump out the water inside the fixing cover 4 and then pump air to form a vacuum environment, so that the fixing cover 4 is anchored on the channel wall surface under the action of water pressure. The channel wall surface is generally a lining board.

[0043] In some embodiments, annular sealing gaskets 15 are fixedly arranged on the opening side edges of both the fixing cover 4 and the detection cover 5.

[0044] The embodiment of the present invention improves the sealing performance.

[0045] The annular gasket 15 is an elastic rubber water stop strip, and the elastic rubber water stop strip is bonded to the edges of the opening sides of the fixed cover 4 and the detection cover 5.

[0046] In some embodiments, both the fixed cover 4 and the detection cover 5 are spherical crown structures.

[0047] The spherical crown structure is the remaining structure after a part of a sphere is cut off by a plane.

[0048] The central angles corresponding to the arc lengths of the spherical cross-sections of the fixed cover 4 and the detection cover 5 are different, and the two are fixedly welded together at the top through a connecting rod.

[0049] In some embodiments, the drainage and pressure regulating device includes an air inflation pump 10 and a water pumping and exhaust device 11. The water pumping and exhaust device 11 and the air inflation pump 10 cooperate to drain the water in the detection cavity and the fixed cover 4. The air inflation pump 10 is used to inflate and pressurize the detection cavity, and the water pumping and exhaust device 11 is also used to exhaust the gas in the detection cavity and the fixed cover 4 to reduce the pressure.

[0050] This embodiment can realize pumping water and regulating pressure for the detection cover 5 and the fixed cover 4.

[0051] In this embodiment, since it is difficult to drain all the water in the fixed cover 4 and the detection cover 5 only by using the drainage and pressure regulating device, the air inflation pump 10 is needed to cooperate for drainage.

[0052] In some embodiments, the embodiment of the present invention further includes a four-way valve and two water-gas connecting pipes 13. One ends of the two water-gas connecting pipes 13 are respectively arranged in the detection cover 5 and the fixed cover 4, and the other ends of the two water-gas connecting pipes 13 are connected to the air inflation pump 10 and the water pumping and exhaust device 11 through the four-way valve.

[0053] The four ports of the four-way valve are respectively connected to the two water-gas connecting pipes 13, the air inflation pump 10, and the water pumping and exhaust device 11. Each port of the four-way valve is equipped with a manual opening and closing valve or an electric opening and closing valve. The four-way valve can realize the connection between the air inflation pump 10 and any one of the water-gas connecting pipes 13 and the connection between the water pumping and exhaust device 11 and any one of the water-gas connecting pipes 13.

[0054] The above four-way valve realizes the purpose of connecting the air inflation pump 10 and any one of the water-gas connecting pipes 13 and connecting the water pumping and exhaust device 11 and any one of the water-gas connecting pipes 13.

[0055] This embodiment realizes the purpose of using a set of drainage and pressure regulating device to pump water and regulate pressure for two independent spaces in the fixed cover 4 and the detection cover 5.

[0056] Of course, in some embodiments, one set of drainage and pressure regulating device may be provided for each cover. That is, two drainage and pressure regulating devices are included. One drainage and pressure regulating device is used for pumping water and regulating pressure for the detection cover 5, and the other drainage and pressure regulating device is used for pumping water and regulating pressure for the fixed cover 4.

[0057] In some embodiments, the water pumping and exhaust device 11 may employ a water-air dual-use pump, or may employ a vacuum pump and a water pump. That is, the water pump is responsible for pumping water, and the vacuum pump is responsible for extracting the gas inside the fixed cover 4 and the detection cover 5.

[0058] In some embodiments, the present invention embodiment may also be provided with two water pipes and four air pipes. One water pipe and two air pipes correspond to the fixed cover 4, and the remaining one water pipe and two air pipes correspond to the detection cover 5. The water pipe is used to communicate with the water pump, and the air pipes are respectively used to communicate with the vacuum pump and the inflation pump 10.

[0059] In some embodiments, the camera 8 and the pressure sensor 7 are connected to the data acquisition system 9 through the transmission line 14. The transmission line 14 and the pipelines for ventilation and drainage are bundled in the connection pipeline 3.

[0060] In some embodiments, two handles 17 are provided outside the fixed cover 4.

[0061] For easy hand-held operation.

[0062] In some embodiments, a drainage and pressure regulating inner pipe 19 is provided inside both the detection cover 5 and the fixed cover 4. The bottom of the drainage and pressure regulating inner pipe 19 extends downward to facilitate the complete extraction of the water inside the cover.

[0063] The present invention also provides a method for detecting an underwater check valve, including: Preparation process: constructing a sealed detection cavity outside the check valve to be detected; extracting the water inside the detection cavity;

[0064] Detection process: adjusting the air pressure inside the detection cavity and observing the water outlet condition and pressure change condition of the check valve to determine whether the function of the check valve is normal.

[0065] The device for detecting an underwater check valve provided by the embodiment of the present invention realizes the underwater detection of the working performance such as the opening and closing and drainage of the check valve under the condition that the channel does not stop water, and thus can comprehensively master the state of the check valve, providing an accurate basis for evaluating the stability of the channel and the subsequent maintenance and replacement of the check valve.

[0066] In some embodiments, during the detection process, first inflate the detection cavity to increase the pressure to the set pressure value. If, after the pressure is applied, the pressure inside the detection cavity can maintain stability or decrease stably but the amplitude does not exceed the set threshold, it is determined that the water-stopping ability of the check valve is normal;

[0067] Discharge the gas in the detection chamber to a pressure lower than the standard atmospheric pressure; observe whether water flows out of the check valve during the pressure reduction process through the camera 8, and then judge whether the opening ability of the check valve is normal in combination with the pressure change situation and the groundwater level situation.

[0068] In some embodiments, when using the device for detecting an underwater check valve as described above to detect the check valve, the steps of constructing the detection chamber in the preparation process include:

[0069] Fasten the fixing cover 4 and the detection cover 5 on the channel wall surface, and pump out the water in the fixing cover 4 to fix the fixing cover 4 and the detection cover 5 on the channel wall surface by using the water pressure.

[0070] In the present invention, the detection cover 5 is fixed on the channel wall surface by setting the fixing cover 4, and the fixing method is simple and easy to implement.

[0071] The specific detection method is as follows:

[0072] Step 1: After debugging the equipment normally on the channel slope, a diver carries the integrated body of the detection cover 5 and the fixing cover 4 and dives into the detection area; at the same time, use the surrounding groundwater monitoring instrument to read the groundwater level.

[0073] Step 2: After the diver conducts an appearance inspection on the check valve, locate the check valve with a complete appearance to be detected, cover the detection cover 5 on the check valve so that the detection chamber can completely cover the check valve inside; the diver assists in pressing the fixing cover 4, and the pressure control system 12 on the shore controls the air pump 10 and the water pumping and exhaust device 11 to pump out the water in the fixing cover 4 and then pump out the air to form a vacuum environment, so that the fixing cover 4 is anchored on the bottom lining plate of the channel under the action of water pressure.

[0074] Step 3: Switch the pressure control system 12 to the loop of the detection chamber, control the air pump 10 and the water pumping and exhaust device 11 to drain all the water in the fixing chamber and then conduct a pressure test first. Monitor the applied pressure magnitude through the pressure sensor 7, and observe the water outlet situation of the check valve through the camera 8; if the pressure can be maintained stable or decrease stably but the amplitude is not large after the pressure is applied, it can be judged that the water stop ability of the check valve is normal.

[0075] Step 4: After the pressure detection is completed, control the vacuum pump to decompress the detection cavity through the pressure control system 12, and monitor the pressure in the detection cavity through the pressure sensor 7 to make it lower than the standard atmospheric pressure (generally, the pressure of the groundwater outside the check valve must be greater than the standard atmospheric pressure); observe whether water flows out of the check valve opening during the decompression process through the underwater camera 8. If there is water flow, it indicates that the check valve is unobstructed; if there is still no water flow until the pressure is reduced to 0.5 standard atmospheric pressure and the groundwater level is higher than the bottom elevation of the canal, it indicates that the check valve is blocked; if the decompression stops after reducing to 0.5 standard atmospheric pressure, the pressure is gradually rising, but there is no water flow, and the groundwater level is lower than the bottom elevation of the canal, it indicates that the check valve is not blocked, but the drainage performance needs to be detected and judged after the groundwater level rises.

[0076] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A device for detecting an underwater check valve, characterized in that: include: A detection cover, a drainage pressure regulating device, a pressure sensor, a camera and a data acquisition system, wherein one side of the detection cover is open, the detection cover is used to snap on the channel wall and cover the check valve to be detected, and a closed detection chamber is formed between the detection cover and the channel wall. The drainage pressure regulating device is used to discharge the water in the detection chamber and adjust the air pressure in the detection chamber. The pressure sensor and the camera are both arranged in the detection cover, and the pressure sensor and the camera are both communicatively connected to the data acquisition system. The data acquisition system is used to collect information obtained by the pressure sensor and the camera and display it.

2. The device for detecting an underwater check valve according to claim 1, characterized in that: It also includes a fixed cover, one side of which is open, and the detection cover is fixedly arranged in the fixed cover. The opening side edge of the fixed cover and the opening side edge of the detection cover are located on the same plane. The fixed cover is used to buckle on the channel wall, and the drainage pressure regulating device can also discharge all or part of the water in the fixed cover.

3. The device for detecting an underwater check valve according to claim 2, characterized in that: An annular sealing pad is fixedly arranged on the opening side edges of the fixed cover and the detection cover.

4. The device for detecting an underwater check valve according to claim 2, characterized in that: The fixed cover and the detection cover are both spherical crown structures.

5. The device for detecting an underwater check valve according to claim 2, characterized in that: The drainage and pressure regulating device includes an air pump and a water pumping and exhaust device. The water pumping and exhaust device cooperates with the air pump to discharge water in the detection chamber and the fixed cover. The air pump is used to inflate and pressurize the detection chamber. The water pumping and exhaust device is also used to discharge the gas in the detection chamber and the fixed cover to reduce the pressure.

6. The device for detecting an underwater check valve according to claim 5, characterized in that: It also includes a four-way valve and two water-gas connecting pipes, one end of the two water-gas connecting pipes are respectively arranged in the detection cover and the fixed cover, and the other ends of the two water-gas connecting pipes are connected to the inflation pump and the water pumping and exhausting device through the four-way valve.

7. The device for detecting an underwater check valve according to claim 2, characterized in that: Two handles are arranged outside the fixed cover.

8. A method for detecting an underwater check valve, characterized in that: include: Preparation process: construct a closed testing chamber outside the check valve to be tested; Pumping out the water in the detection chamber; Testing process: adjust the air pressure in the testing chamber and observe the water outflow condition of the check valve and the pressure change condition to determine whether the function of the check valve is normal.

9. The method for detecting an underwater check valve according to claim 8, characterized in that: During the detection process, air is first inflated into the detection chamber to increase the pressure to the set pressure value. If, after the pressure is applied, the pressure in the detection chamber can maintain a stable pressure or steadily decrease but the amplitude does not exceed the set threshold, it is judged that the water stopping ability of the check valve is normal; The gas in the detection chamber is discharged until the pressure is lower than the standard atmospheric pressure; the camera is used to observe whether water flows out of the check valve during the decompression process, and then the opening ability of the check valve is judged to be normal based on the pressure change and groundwater level.

10. The method for detecting an underwater check valve according to claim 8, characterized in that: The device for detecting an underwater check valve according to claim 2 is used to detect the check valve, and the step of constructing the detection cavity in the preparation process includes: The fixing cover and the detection cover are buckled on the channel wall surface, and the water in the fixing cover is pumped out to fix the fixing cover and the detection cover on the channel wall surface by using water pressure.

Images