A small flow discontinuous groundwater radon concentration real-time monitoring system and method

Abstract

The application provides a small flow discontinuous groundwater radon concentration real-time monitoring system and method, which comprises a cabinet body and a radon concentration measuring device, a drainage and gathering device, and a measuring and gathering integrated device. The drainage and gathering device comprises a drainage pipe, a water collecting cavity and a water valve. The measuring and gathering integrated device comprises a central cylinder, a disc cylinder, four water collecting bottles and an exhaust mechanism. The central cylinder is connected with a third air inlet pipe, a third air outlet pipe and a third water outlet pipe, and the horizontal included angle between the third air inlet pipe and the third air outlet pipe is 90 degrees. The water collecting bottles are provided with a first water inlet pipe, a first air outlet pipe, a first air inlet pipe and a fourth water outlet pipe. When the disc cylinder rotates, the four water collecting bottles are in different states. The first water inlet pipe of the water collecting bottle in the water collecting state is located directly below the water outlet pipe. The first air outlet pipe of the water collecting bottle in the measuring state is communicated with the third air outlet pipe, and the first air inlet pipe is communicated with the third air inlet pipe. The fourth water outlet pipe of the water collecting bottle in the water draining state is communicated with the third water outlet pipe. The application can gather, collect and detect small flow discontinuous water samples.

Description

Technical Field

[0001] The present application relates to the field of nuclear radiation detection technology, and in particular to a system and method for real-time monitoring of radon concentration in discontinuous groundwater with a small flow rate. Background Art

[0002] radon( 222 Rn) is a radioactive isotope that is widely distributed in the air, rock, soil and water in the environment. It is a colorless, odorless, water-soluble inert gas.

[0003] Geological disasters such as landslides, earthquakes, and cavern collapses, triggered by human or natural factors, pose a significant threat to human life and property. Water (such as rainfall, cyclical fluctuations in reservoir water levels, and excess pore water pressure at faults) often plays a key role in these disasters. Groundwater is also the primary carrier of rock and soil material, and its physical and chemical parameters are important indicators of rock and soil evolution. In particular, abnormal changes in radon concentrations in groundwater often indicate the evolution of the rock and soil's internal structure and can serve as a key early warning indicator for geological disasters.

[0004] Furthermore, with the continued advancement of infrastructure construction and excavation technology in my country, the scale and number of tunnels and underground caverns have increased exponentially. Due to the tightness and poor ventilation of these underground structures, radon gas accumulation is a common problem during both excavation and operation. High radon concentrations pose a serious health risk to personnel, making the radon concentration in tunnel groundwater a critical safety indicator. Whether through landslides, earthquakes, or the excavation of underground caverns, rock or soil masses can deform, damage, or even fail. This deformation and failure releases radon into the surrounding groundwater, causing significant variations in radon concentrations in the water flowing through the rock and soil. However, due to the varying permeability of different rock and soil masses and seasonal variations in atmospheric precipitation, water flow rates can vary in both time and space. Therefore, long-term monitoring of radon in water requires addressing these small, discontinuous flow conditions.

[0005] On the one hand, water samples exposed in some dense rock and soil bodies often drip. To prevent the radon gas from escaping due to dripping water, water samples need to be collected close to the water outcrop point. This water sampling is generally done manually. The labor cost of collecting and measuring water samples over several years is extremely high. Furthermore, water monitoring points are often located in the field. Due to the temporal non-uniformity of groundwater flow, it is often difficult to ensure the timely collection of water samples and the real-time measurement of water samples manually. Furthermore, the data collection density for long-term monitoring is low, which is very unfavorable for long-term radon monitoring.

[0006] On the other hand, in addition to the above-mentioned manual collection monitoring, the existing long-term monitoring method of water body radon concentration often takes continuous water as the monitoring object, releases the water sample through the nozzle by pumping, releases radon gas from the water body for measurement. This has certain requirements for the flow of water sample, and often needs continuous flow to meet the real-time uninterrupted monitoring of radon gas in groundwater. Another way to consider the balance between radon in water and radon in air for radon concentration monitoring can not consider the continuity of water flow, but this monitoring method also has certain flow requirements, which requires the water in the device to be completely updated once in a period of time, and the response time to radon concentration change is long, so there may be a lag in the sudden change of radon concentration, which is very unfavorable for the prediction and early warning of earthquakes and landslides. SUMMARY

[0007] In order to improve the problem that the radon concentration in small flow groundwater is difficult to detect efficiently, the present application provides a small flow discontinuous groundwater radon concentration real-time monitoring system and method.

[0008] In the first aspect, the present application provides a small flow discontinuous groundwater radon concentration real-time monitoring system, which adopts the following technical scheme:

[0009] A small flow discontinuous groundwater radon concentration real-time monitoring system, comprising a cabinet body and a radon concentration measuring device, further comprising:

[0010] A drainage gathering device, comprising:

[0011] A drainage pipe comprising a horn-shaped opening and a drainage pipe;

[0012] A water collecting cavity provided at the top of the cabinet body and used for receiving water falling from the drainage pipe; and

[0013] A water valve comprising a movable ball valve and a water outlet pipe in communication with the water collecting cavity;

[0014] A set-measuring integrated device, comprising:

[0015] A central cylinder, on which a third air inlet pipe, a third air outlet pipe and a third drain pipe with a horizontal included angle of 90° between adjacent two pipes are connected, the bottom end of the third air inlet pipe is in communication with the output end of the radon concentration measuring device, and the bottom end of the third air outlet pipe is in communication with the input end of the radon concentration measuring device;

[0016] A disc-cylinder rotatably arranged on the side of the central cylinder; and

[0017] Four water collecting bottles are arranged on the disc-cylinder at equal intervals, and the water collecting bottles are provided with a first water inlet pipe, a first air outlet pipe, a first air inlet pipe, a fourth drain pipe and an air exhaust mechanism;

[0018] When the disc cylinder rotates, the four water collecting bottles are in different states, the water collecting bottle in the water collecting state only has its first water inlet pipe located directly below the water outlet pipe; the water collecting bottle in the measuring state has its first air outlet pipe and third air outlet pipe in communication, and its first air inlet pipe and third air inlet pipe in communication; the water collecting bottle in the water draining state has its fourth water outlet pipe in communication with the third water outlet pipe.

[0019] Further, the disc cylinder is provided with four second air inlet pipes, second air outlet pipes and second water outlet pipes, the four second air inlet pipes are connected with the four first air outlet pipes one by one in a one-to-one correspondence, the four second air outlet pipes are connected with the four first air inlet pipes one by one in a one-to-one correspondence, and the four second water outlet pipes are connected with the four fourth water outlet pipes one by one in a one-to-one correspondence.

[0020] The horizontal included angle between the second air inlet pipe, the second air outlet pipe and the second water outlet pipe adjacent to each other is 90°.

[0021] The top end horizontal height of the second air inlet pipe and the third air outlet pipe is the same, the top end horizontal height of the second air outlet pipe and the third air inlet pipe is the same, and the top end horizontal height of the second water outlet pipe and the third water outlet pipe is the same.

[0022] Further, the outer peripheral wall of the central cylinder is wrapped with a sealing water isolation layer, a first opening hole is formed in the sealing water isolation layer and in communication with the top end of the third air outlet pipe, and the diameter of the first opening hole is smaller than the diameter of the second air inlet pipe.

[0023] A second opening hole is formed in the sealing water isolation layer and in communication with the top end of the third air inlet pipe, and the diameter of the second opening hole is smaller than the diameter of the second air outlet pipe.

[0024] A third opening hole is formed in the sealing water isolation layer and in communication with the top end of the third water outlet pipe, and the diameter of the third opening hole is smaller than the diameter of the second water outlet pipe.

[0025] Further, the first water inlet pipe, the first air inlet pipe, the first air outlet pipe and the fourth water outlet pipe are all provided with a one-way valve.

[0026] The one-way valve on the first water inlet pipe is in a passage direction from top to bottom, the one-way valve outside the first air inlet pipe is in a passage direction from outside to inside of the bottle, the one-way valve on the first air outlet pipe is in a passage direction from inside to outside of the bottle, and the one-way valve on the fourth water outlet pipe is in a passage direction from inside to outside of the bottle.

[0027] Further, the exhaust mechanism comprises an exhaust movable valve arranged at the top of the water collecting bottle, the exhaust movable valve is provided with at least two convex exhaust holes at the top and a rubber cylinder is arranged to slide inside, and a middle opening hole is formed in the middle of the rubber cylinder and is arranged in a staggered manner with the multiple convex exhaust holes.

[0028] Further, the first air inlet pipe is connected with a porous glass rod at the end extending into the water collecting bottle.

[0029] Further, the cabinet is provided with a second stepping motor and a water collection full signal processing device, and the output end of the second stepping motor is in transmission connection with the disc cylinder.

[0030] The water collection full signal processing device comprises:

[0031] The top end of the measuring cylinder is provided with an extension opening near one side of the disc cylinder, and the top end of the first water inlet pipe is provided with a water overflow opening away from the central cylinder, and the extension opening is located below the water overflow opening on the water collecting bottle in the water collecting state.

[0032] A first pressure sensor is installed on the inner wall of the measuring cylinder and is in control connection with the second stepping motor.

[0033] A first drain pipe is connected to the side wall at the bottom end of the measuring cylinder, and the maximum drainage flow rate of the first drain pipe is 0.045 ml / min.

[0034] Further, the radon concentration measuring device comprises a cylindrical drying tube and a radon monitor, the air inlet of the cylindrical drying tube is in communication with the third air outlet pipe, the air outlet is in communication with the air inlet of the radon monitor, and the air outlet of the radon monitor is in communication with the third air inlet pipe.

[0035] Further, the cabinet is connected with a water outlet at one side of the top of the water collecting cavity.

[0036] In a second aspect, the application provides a small-flow discontinuous groundwater radon concentration real-time monitoring method, which is based on the above-mentioned small-flow discontinuous groundwater radon concentration real-time monitoring system and comprises the following steps:

[0037] S1. The horn-shaped opening of the drainage pipe is fixed directly below the exposed water sample, and the lower end of the drainage pipe is placed in the water collecting cavity.

[0038] S2. The water sample flows through the water valve to the first water inlet pipe of the water collecting bottle in the water collecting state and is stored in the water collecting bottle; at this time, the first air outlet pipe, the first air inlet pipe and the fourth drain pipe on the water collecting bottle do not form a passage with the central cylinder, the gas in the water collecting bottle is discharged through the air discharge mechanism, and the water level in the bottle continuously rises.

[0039] S3. When the water level in the water collecting bottle in step S2 reaches the set value, the disc cylinder is driven to rotate 90°, and the water collecting bottle enters the measurement state, the first air outlet pipe thereof is in communication with the third air outlet pipe, and the first air inlet pipe thereof is in communication with the third air inlet pipe, radon gas diffused in the water collecting bottle enters the radon concentration measuring device for radon concentration detection, and the gas after detection is returned to the water collecting bottle through the third air inlet pipe and the first air inlet pipe;

[0040] S4. When the radon concentration detection in the water collecting bottle in step S3 is completed, the disc cylinder is continuously driven to rotate 90° in the same direction, and the water collecting bottle enters the water draining state, the fourth water outlet pipe thereof is in communication with the third water outlet pipe, and the water level in the bottle continuously decreases;

[0041] S5. The disc cylinder is continuously driven to rotate 90° in the same direction each time, so that each water collecting bottle on the disc cylinder sequentially experiences steps S2-S4, and real-time monitoring of the radon concentration of small-flow discontinuous water samples is realized.

[0042] In summary, the present application has at least one of the following beneficial technical effects:

[0043] 1. The present application can realize the gathering and collection of small-flow discontinuous water samples through the plurality of drainage pipes on the drainage gathering device, and can also reduce the radon gas diffusion caused by dripping;

[0044] 2. The disc cylinder in the integrated water collecting and measuring device is sequentially rotated 90°, so that each water collecting bottle sequentially experiences the water collecting state, the measurement state, the water draining state and the idle state, and circulates, so that automatic water sample collection, monitoring and discharge are realized, the labor cost is reduced, and the timeliness of water sample collection and monitoring is effectively improved;

[0045] 3. The present application can realize radon concentration monitoring of small-flow discontinuous underground water, and the flow required for general continuous water body radon measurement is 2-3 L / min, and the flow of the water body used in the present application only needs to satisfy the condition that the water collecting bottle is full before radon decay, that is, greater than 0.045 ml / min, so that the flow range of the measured water sample is significantly expanded;

[0046] 4. The present application can automatically collect water and measure radon through the integrated water collecting and measuring device, and compared with the radon measurement mode of discontinuous water sample using water vapor balance, the response time is obviously improved, and the water vapor balance time of general radon is about 2 hours at the fastest, and the fastest completion time of one set of measurement of the present application is about 30 minutes;

[0047] 5. The present application sets the control and data collection device, which can realize remote transmission and real-time analysis of radon concentration data on one hand, and can remotely control the operation of the whole system on the other hand, so that the instrument failure can be found and stopped in time;

[0048] 6. The application is a modular system, and the detachable power supply can realize long-time radon concentration monitoring of water samples in the field. Meanwhile, part of the battery can be replaced without power failure, which does not affect the normal operation of the system. The detachable and replaceable radon monitor is convenient for maintenance, and can also reduce system failure time by direct replacement. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0050] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0051] Figure 2 is a schematic diagram of the cross-sectional structure of the integrated measuring device of the embodiment of the present application;

[0052] Figure 3 is a schematic diagram of the cross-sectional structure of the integrated measuring device of the embodiment of the present application;

[0053] Figure 4 is Figure 3 the top view, the cross-sectional view along the line I-I', the cross-sectional view along the line II-II', and the cross-sectional view along the line III-III' of the integrated measuring device in

[0054] Figure 5 is a schematic diagram of the structure of the water collecting bottle of the embodiment of the present application.

[0055] Reference signs:

[0056] 1. Drainage converging device; 11. Drainage pipe; 111. Horn-shaped opening; 112. Drainage pipe; 12. Water collecting cavity; 121. Water outlet; 122. Lower concave basin; 13. Water valve; 131. Movable ball valve; 132. Water outlet pipe; 14. Steel track;

[0057] 2. Integrated measuring device;

[0058] 21. Water collecting full load signal processing device; 211. First drainage pipe; 212. First pressure sensor; 213. Measuring cylinder;

[0059] 22. Disc cylinder; 221. Second air inlet pipe; 222. Second air outlet pipe; 223. Second drainage pipe;

[0060] 23, central cylinder; 231, sealing water layer; 232, third air inlet pipe; 233, third air outlet pipe; 234, third drain pipe; 235, third opening; 236, first opening; 237, second opening;

[0061] 24, water collection bottle; 241, first water inlet pipe; 242, air exhaust movable valve; 2421, outer convex air exhaust hole; 2422, rubber cylinder; 243, first air outlet pipe; 244, first air inlet pipe; 2441, porous glass rod; 245, one-way valve; 246, fourth drain pipe;

[0062] 3, radon concentration measuring device; 31, cylindrical drying pipe; 32, radon monitor;

[0063] 4, control and data collection device; 41, wireless signal receiver transmitter; 42, wireless data collector; 43, host computer; 44, display;

[0064] 5, first stepping motor; 6, power supply; 7, second stepping motor; 8, cabinet body. DETAILED DESCRIPTION

[0065] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0066] Referring to Figure 1 and Figure 2 The embodiments of the present application disclose a small-flow discontinuous groundwater radon concentration real-time monitoring system, which comprises a cabinet body 8 and a radon concentration measuring device 3. The cabinet body 8 is made of transparent sealing material as a whole, and has good sealing property and structural strength.

[0067] Further comprising:

[0068] The drainage gathering device 1 comprises:

[0069] The drainage pipe 112 comprises the horn-shaped opening 111 and the drainage pipe 112.

[0070] The water collecting cavity 12 is arranged at the top of the cabinet body 8 and is used for receiving water falling from the drainage pipe 112. The water collecting cavity 12 comprises a lower concave basin 122 arranged at the top of the cabinet body 8 and a water outlet 121 connected to one side of the top of the lower concave basin 122. When the water flow in the water collecting cavity 12 is too large, the water will be discharged from the water outlet 121; and

[0071] The water valve 13 comprises a movable ball valve 131 and a water outlet pipe 132, and the first stepper motor 5 is arranged in the cabinet body 8, the movable ball valve 131 is connected with the output end of the first stepper motor 5 through a stainless steel track, and the movable ball valve 131 can be controlled to rotate by the first stepper motor 5, so as to realize the opening and closing of the water valve 13.

[0072] The integrated measuring device 2, referring to Figure 2 and Figure 3 comprises:

[0073] The central cylinder 23 is connected with the third air inlet pipe 232, the third air outlet pipe 233 and the third drain pipe 234, the horizontal included angle between adjacent two pipes is 90°, the bottom end of the third air inlet pipe 232 is communicated with the output end of the radon concentration measuring device 3, and the bottom end of the third air outlet pipe 233 is communicated with the input end of the radon concentration measuring device 3;

[0074] The disc cylinder 22 is rotationally arranged on the side of the central cylinder 23, specifically, the disc cylinder 22 is separated from the central cylinder 23, and the upper and lower ends of the central cylinder 23 and the disc cylinder 22 are fixed by bearings; and

[0075] The water collecting bottles 24 are arranged in equal intervals on the disc cylinder 22, and each water collecting bottle 24 is provided with a first water inlet pipe 241, a first air outlet pipe 243, a first air inlet pipe 244, a fourth drain pipe 246 and an exhaust mechanism.

[0076] Referring to Figure 3 and Figure 4 When the disc cylinder 22 rotates, the four water collecting bottles 24 are in different states, the first water inlet pipe 241 of the water collecting bottle 24 in the water collecting state is located directly below the water outlet pipe 132; the first air outlet pipe 243 of the water collecting bottle 24 in the measuring state is communicated with the third air outlet pipe 233, and the first air inlet pipe 244 is communicated with the third air inlet pipe 232; the fourth drain pipe 246 of the water collecting bottle 24 in the drain state is communicated with the third drain pipe 234; the water collecting bottle 24 in the idle state is not communicated with the water outlet pipe 132 and the central cylinder 23.

[0077] The four water collecting bottles 24 are communicated with the disc cylinder 22 and are fixed in position, specifically, the disc cylinder 22 is provided with four second air inlet pipes 221, second air outlet pipes 222 and second drain pipes 223, the four second air inlet pipes 221 are respectively connected with the four first air outlet pipes 243 one by one, the four second air outlet pipes 222 are respectively connected with the four first air inlet pipes 244 one by one, and the four second drain pipes 223 are respectively connected with the four fourth drain pipes 246 one by one;

[0078] The horizontal included angle between adjacent two of the second air inlet pipe 221, the second air outlet pipe 222 and the second drain pipe 223 is 90°.

[0079] The second air inlet pipe 221 has the same horizontal height as the top end of the third air outlet pipe 233, the second air outlet pipe 222 has the same horizontal height as the top end of the third air inlet pipe 232, and the second drain pipe 223 has the same horizontal height as the top end of the third drain pipe 234.

[0080] Further, the outer wall of the central cylinder 23 is wrapped with a sealing water isolation layer 231, which is fixed relative to the central cylinder 23. The second air inlet pipe 221, the second air outlet pipe 222 and the second drain pipe 223 on the disc cylinder 22 are closely attached to the outer wall of the sealing water isolation layer 231 at the end close to the central cylinder 23, and can slide relative to the sealing water isolation layer 231. The sealing water isolation layer 231 is made of elastic sealing material with good air tightness and wear resistance, such as butyl rubber or polyurethane rubber.

[0081] The sealing water isolation layer 231 is provided with a first opening hole 236 communicating with the top end of the third air outlet pipe 233, and the diameter of the first opening hole 236 is smaller than the diameter of the second air inlet pipe 221.

[0082] The sealing water isolation layer 231 is provided with a second opening hole 237 communicating with the top end of the third air inlet pipe 232, and the diameter of the second opening hole 237 is smaller than the diameter of the second air outlet pipe 222.

[0083] The sealing water isolation layer 231 is provided with a third opening hole 235 communicating with the top end of the third drain pipe 234, and the diameter of the third opening hole 235 is smaller than the diameter of the second drain pipe 223.

[0084] The first opening hole 236, the second opening hole 237 and the third opening hole 235 are respectively aligned with the second air inlet pipe 221, the second air outlet pipe 222 and the second drain pipe 223 in vertical height, and are respectively aligned with the horizontal distribution positions of the four water collecting bottles 24 on the disc cylinder 22 with a 90° interval between adjacent opening holes in horizontal distribution.

[0085] In addition, the first water inlet pipe 241, the first air inlet pipe 244, the first air outlet pipe 243 and the fourth drain pipe 246 are respectively provided with a one-way valve 245.

[0086] The one-way valve 245 on the first water inlet pipe 241 has a passage direction from top to bottom, the one-way valve 245 outside the first air inlet pipe 244 has a passage direction from outside to inside of the bottle, the one-way valve 245 on the first air outlet pipe 243 has a passage direction from inside to outside of the bottle, and the one-way valve 245 on the fourth drain pipe 246 has a passage direction from inside to outside of the bottle.

[0087] Further, with reference to Figure 1, the radon concentration measuring device 3 includes a cylindrical drying tube 31 and a radon monitor 32, the cylindrical drying tube 31 is made of acrylic transparent material, and the drying agent in the cylindrical drying tube 31 is anhydrous copper sulfate with an indication function; the gas inlet of the cylindrical drying tube 31 is communicated with the third gas outlet pipe 233, the gas outlet is communicated with the gas inlet of the radon monitor 32, the gas outlet of the radon monitor 32 is communicated with the third gas inlet pipe 232, so as to form a closed loop; the radon monitor 32 contains a micro pump, and the radon monitor 32 can receive wireless signal to control the micro pump switch and measurement.

[0088] In addition, with reference to Figure 5 The above-mentioned exhaust mechanism includes an exhaust movable valve 242 arranged at the top of the water collecting bottle 24, at least two convex exhaust holes 2421 are arranged at the top of the exhaust movable valve 242, a rubber cylinder 2422 is arranged in the exhaust movable valve 242 in a sliding manner, and a middle opening is arranged in the middle of the rubber cylinder 2422 and is arranged in a staggered manner with the plurality of convex exhaust holes 2421; wherein the diameter of the rubber cylinder 2422 is slightly smaller than the inner diameter of the shell of the exhaust movable valve 242, the diameter of the middle opening of the rubber cylinder 2422 is smaller than the net distance between the two convex exhaust holes 2421, and the density of the rubber cylinder 2422 is smaller than water, so that the rubber cylinder 2422 can move up and down in the exhaust movable valve 242 due to the buoyancy of water. And the end of the first gas inlet pipe 244 extending into the water collecting bottle 24 is connected with a porous glass rod 2441, and the arrangement of the porous glass rod 2441 can increase the contact between the gas pumped by the radon monitor 32 and the water in the water collecting bottle 24.

[0089] And, in order to realize automatic measurement, with reference to Figure 1 And Figure 2 The second stepper motor 7 is drivingly connected between the output end of the second stepper motor 7 and the disc cylinder 22, specifically, the second stepper motor 7 is connected between the output end of the second stepper motor 7 and the disc cylinder 22 through the steel track 14, and the rotation angle of the disc cylinder 22 can be controlled by the second stepper motor 7.

[0090] The water collecting full load signal processing device 21 includes:

[0091] The graduated cylinder 213 is provided with an extension opening at the top end close to one side of the disc cylinder 22, the first water inlet pipe 241 is provided with a water overflow opening at the top end away from one side of the central cylinder 23, and the extension opening is located below the water overflow opening on the water collecting bottle 24 in the water collecting state;

[0092] The first pressure sensor 212 is installed on the inner wall of the graduated cylinder 213 and is connected to the second stepper motor 7 and the first stepper motor 5; and

[0093] The first drain pipe 211 is connected to the bottom end side wall of the measuring cylinder 213, and the maximum drainage flow rate of the first drain pipe 211 is 0.045 ml / min; the purpose of setting the first drain pipe 211 as a small flow pipe is to appropriately prolong the time length of the water collecting state of the water collecting bottle 24 in this state, so as to be close to the time consumption of the water collecting bottle 24 in the measuring state and the drainage state, avoiding that after the water collecting bottle 24 in the water collecting state is full, the water collecting bottle 24 in the measuring state and the drainage state still does not complete the measurement and drainage process, and the second stepper motor 7 controls the disc cylinder 22 to rotate to switch the state, which affects the detection quality and the subsequent process.

[0094] Specifically, referring to Figure 1 , the cabinet 8 is provided with a control and data collection device 4, and the control and data collection device 4 includes a wireless data collector, a wireless signal receiver and transmitter 41, a host computer 43, a display 44 and a power supply 6; the power supply 6 supplies power to the integrated measuring device 2, the radon concentration measuring device 3, and the control and data collection device 4; the power supply 6 is a plurality of batteries, which are set as detachable batteries, and a single battery can be replaced under continuous power supply.

[0095] Therefore, the communication mode of the central cylinder 23 and the disc cylinder 22 makes the disc cylinder 22 rotate, and the water collecting bottles 24 at different positions are in different passages, referring to Figure 4 . For example, the arrangement direction of the water collecting bottle 24 in Figure 2 , the first air outlet pipe 243, the first air inlet pipe 244 and the fourth drain pipe 246 of the water collecting bottle 24 on the left side of the disc cylinder 22 do not form a passage with the central cylinder 23, at this time, the water sample flows into the water collecting bottle 24 from the first water inlet pipe 241 through the water outlet pipe 132, and the water collecting bottle 24 is in the state of collecting water sample, which is called the water collecting state; the first air outlet pipe 243 and the first air inlet pipe 244 of the water collecting bottle 24 at the rear end of the disc cylinder 22 (as shown by the water collecting bottle 24 on the left side in Figure 3 ) form a passage with the central cylinder 23 through the first opening 236 and the second opening 237 respectively, and are connected with the radon concentration measuring device 3, and the first drain pipe 211 does not form a passage, which is in the radon gas measuring state, called the measuring state; the first air outlet pipe 243 and the first air inlet pipe 244 of the water collecting bottle 24 at the right end of the disc cylinder 22 do not form a passage with the central cylinder 23, but the first drain pipe 211 forms a passage with the third opening 235, which is in the drainage state.

[0096] In a specific operation, the water collecting bottle 24 in the water collecting state sends a signal to the first pressure sensor 212, representing that the water sample collection is completed; the water collecting bottle 24 in the measuring state sends radon concentration data to the radon concentration measuring device 3, representing that the measurement is completed, and the general time is set to not more than 30 min; the water collecting bottle 24 in the water discharging state sets the minimum water discharging flow rate by controlling the third water discharging pipe 234, the third opening 235 and the aperture size of the second water discharging pipe 223, so as to ensure that the water discharging is completed within 25 min. Only when the water collecting bottle 24 in the water collecting state and the water collecting bottle 24 in the measuring state are both completed, the control and data collection device 4 sends a rotating signal to the second stepping motor 7 to drive the disc-cylinder 22 to rotate to switch the state of the water collecting bottle 24. At the same time, in the process of rotating the disc-cylinder 22, the control and data collection device 4 also sends a rotating signal to the first stepping motor 5 to drive the movable ball valve 131 to rotate to close the water valve 13; when the disc-cylinder 22 is rotated to the position, the control and data collection device 4 sends a rotating signal to the first stepping motor 5 to drive the movable ball valve 131 to rotate reversely to open the water valve 13.

[0097] Since the sealing water layer 231 is only opened at a specific position, only the water collecting bottle 24 reaching the corresponding opening forms a passage when the water collecting bottle 24 is switched, and the first air outlet pipe 243, the first air inlet pipe 244 and the fourth water discharging pipe 246 of the water collecting bottle 24 are always sealed in the switching process; the sealing water layer 231 is tightly filled between the disc-cylinder 22 and the central cylinder 23, so as to ensure the sealing property of the sealing water layer 231 at the unopened position.

[0098] In addition, the disc-cylinder 22 is rotated clockwise under the driving of the second stepping motor 7, each water collecting bottle 24 sequentially experiences the processes of collecting water sample, measuring radon concentration, discharging water and idling, and circulates repeatedly; wherein the third water discharging pipe 234, the third opening 235, the second water discharging pipe 223 and the pipelines connecting the three need to meet the minimum water discharging flow rate of 25 ml / min.

[0099] The embodiment of the application also discloses a small-flow discontinuous underground water radon concentration real-time monitoring method based on the small-flow discontinuous underground water radon concentration real-time monitoring system.

[0100] The small-flow discontinuous underground water radon concentration real-time monitoring method comprises the following steps:

[0101] S1. The horn-shaped opening 111 of the drainage pipe 112 is fixed directly below the water outlet, and the lower end of the drainage pipe 112 is arranged in the water collecting cavity 12; if there are multiple water outlets in the same small area, multiple drainage pipes 112 can be used to gather all the water samples into the water collecting cavity 12.

[0102] S2. The water sample flows through the water valve 13 to the first water inlet pipe 241 of the water collecting bottle 24 in the water collecting state, and is stored in the water collecting bottle 24; at this time, the first gas outlet pipe 243, the first gas inlet pipe 244 and the fourth water outlet pipe 246 of the water collecting bottle 24 do not form a passage with the central cylinder 23, the gas in the water collecting bottle 24 is discharged through the exhaust mechanism, and the water level in the bottle is continuously raised.

[0103] S3. When the water level in the water collecting bottle 24 in step S2 reaches a set value and is detected by the first pressure sensor 212, the second stepping motor 7 is controlled to drive the disc cylinder 22 to rotate by 90°, and the water collecting bottle 24 enters the measuring state, the first gas outlet pipe 243 is communicated with the third gas outlet pipe 233, and the first gas inlet pipe 244 is communicated with the third gas inlet pipe 232, the radon gas escaping from the water collecting bottle 24 enters the radon concentration measuring device 3 for radon concentration detection, and after the detection is completed, the gas is returned to the water collecting bottle 24 through the third gas inlet pipe 232 and the first gas inlet pipe 244 under the pumping of the micro pump in the radon monitor 32, so as to keep the air pressure in the water collecting bottle 24 balanced and promote the radon gas in the water to be precipitated. And during the radon concentration detection, the wireless data collector records the date and time when the second stepping motor 7 completes the rotation, the wireless signal receiver transmitter 41 sends a pump operation signal to the radon monitor 32, the radon monitor 32 pumps the gas in the water collecting bottle 24 to carry the radon gas in the water body of the water collecting bottle 24 to the radon monitor 32, starts to measure the radon concentration, and records the measurement result, and the monitoring time of the water body radon concentration needs 30 minutes.

[0104] S4. When the radon concentration detection in the water collecting bottle 24 in step S3 is completed, the disc cylinder 22 is continuously driven to rotate by 90° in the same direction, and the water collecting bottle 24 enters the water draining state, the fourth water outlet pipe 246 is communicated with the third water outlet pipe 234, and the water level in the bottle is continuously lowered.

[0105] S5. Continue to drive the disc cylinder 22 to rotate by 90° in the same direction each time, so that each water collecting bottle 24 on the disc cylinder 22 sequentially experiences steps S2-S4 and circulates, to realize real-time monitoring of the radon concentration of small flow discontinuous water sample; wherein the starting mechanism of the disc cylinder 22 rotating by 90° each time is based on the water in each water collecting bottle 24 in the water collecting state being full and overflowing into the measuring cylinder 213, which is controlled by the water full signal processing device 21, and a complete measurement signal is also sent by the radon concentration measuring device 3, which is synchronously controlled by the two; and in the process of rotating the disc cylinder 22, the first stepping motor 5 also drives the movable ball valve 131 to rotate to close the water valve 13, and after the disc cylinder 22 is rotated in place, the first stepping motor 5 drives the movable ball valve 131 to rotate in the opposite direction to open the water valve 13.

[0106] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A small flow discontinuous groundwater radon concentration real-time monitoring system, including a cabinet and a radon concentration measuring device, characterized in that: Also includes: A drainage and converging device, comprising: Drainage tube, including a trumpet-shaped opening and a drainage tube; A water collection chamber is provided at the top of the cabinet and is used to receive water falling from the drainage pipe; and A water valve, comprising a movable ball valve and a water outlet pipe in communication with the water collection chamber; The integrated testing device comprises: A central cylinder, to which a third air inlet pipe, a third air outlet pipe, and a third drain pipe are connected, with adjacent ones forming a horizontal angle of 90°. The bottom end of the third air inlet pipe is connected to the output end of the radon concentration measuring device, and the bottom end of the third air outlet pipe is connected to the input end of the radon concentration measuring device. a disc cylinder, rotatably disposed on the circumference of the central cylinder; and There are four water collecting bottles, which are evenly spaced on the disc cylinder. The water collecting bottles are provided with a first water inlet pipe, a first air outlet pipe, a first air inlet pipe, a fourth water drain pipe and an exhaust mechanism; When the disc cylinder rotates, the four water collecting bottles are in different states. The water collecting bottle in the water collecting state has only its first water inlet pipe located directly below the water outlet pipe; the first air outlet pipe of the water collecting bottle in the measuring state is connected with the third air outlet pipe, and the first air inlet pipe is connected with the third air inlet pipe; the fourth drain pipe of the water collecting bottle in the draining state is connected with the third drain pipe.

2. A small flow discontinuous groundwater radon concentration real-time monitoring system according to claim 1, characterized in that: Four second air inlet pipes, a second air outlet pipe and a second drain pipe are provided on the disc cylinder. The four second air inlet pipes are connected to the four first air outlet pipes in a one-to-one correspondence, the four second air outlet pipes are connected to the four first air inlet pipes in a one-to-one correspondence, and the four second drain pipes are connected to the four fourth drain pipes in a one-to-one correspondence. The horizontal angle between the second air inlet pipe, the second air outlet pipe and the second drain pipe is 90°; The second air inlet pipe and the third air outlet pipe have the same top level, the second air outlet pipe and the third air inlet pipe have the same top level, and the second drain pipe and the third drain pipe have the same top level.

3. A real-time monitoring system for radon concentration in discontinuous groundwater with small flow rate according to claim 2, characterized in that: The outer peripheral wall of the central cylinder is wrapped with a sealing waterproof layer, and the sealing waterproof layer is provided with a first opening connected to the top end of the third air outlet pipe, and the aperture of the first opening is smaller than the diameter of the second air inlet pipe; The sealing waterproof layer is provided with a second opening connected to the top end of the third air inlet pipe, and the diameter of the second opening is smaller than the diameter of the second air outlet pipe; The sealing waterproof layer is provided with a third opening connected to the top end of the third drainage pipe, and the diameter of the third opening is smaller than the diameter of the second drainage pipe.

4. A real-time monitoring system for low-flow discontinuous groundwater radon concentration according to claim 1, characterized in that: The first water inlet pipe, the first air inlet pipe, the first air outlet pipe and the fourth drain pipe are all provided with a one-way valve; The one-way valve on the first water inlet pipe has a passage direction from top to bottom, the one-way valve outside the first air inlet pipe has a passage direction from outside the bottle to inside the bottle, the one-way valve on the first air outlet pipe has a passage direction from inside the bottle to outside the bottle, and the one-way valve on the fourth drain pipe has a passage direction from inside the bottle to outside the bottle.

5. The real-time monitoring system for low-flow discontinuous groundwater radon concentration according to claim 1 is characterized in that: The exhaust mechanism includes an exhaust movable valve arranged on the top of the water collecting bottle, the top of the exhaust movable valve is provided with at least two outwardly protruding exhaust holes, and a rubber cylinder is slidingly arranged inside. The middle of the rubber cylinder is provided with an intermediate opening which is staggered with the multiple outwardly protruding exhaust holes.

6. A real-time monitoring system for low-flow discontinuous groundwater radon concentration according to claim 1, characterized in that: One end of the first air inlet pipe extending into the water collecting bottle is connected to a porous glass rod.

7. A small flow discontinuous groundwater radon concentration real-time monitoring system according to any one of claims 1 to 6, characterized in that: A second stepper motor and a water collection full load signal processing device are provided in the cabinet, and an output end of the second stepper motor is transmission-connected to the disc cylinder; The water collection full load signal processing device includes: A measuring cylinder, wherein an extension port is provided on a side of the top end thereof close to the disc cylinder, an overflow port is provided on a side of the top end of the first water inlet pipe away from the central cylinder, and the extension port is located below the overflow port on the water collecting bottle in a water collecting state; a first pressure sensor, mounted on the inner wall of the measuring cylinder and controllably connected to the second stepping motor; and The first drain pipe is connected to the side wall of the bottom end of the measuring cylinder, and the maximum drainage flow rate of the first drain pipe is 0.045 ml / min.

8. The real-time monitoring system for low-flow discontinuous groundwater radon concentration according to claim 1, characterized in that: The radon concentration measuring device includes a cylindrical drying tube and a radon monitor. The air inlet of the cylindrical drying tube is connected to the third air outlet pipe, the air outlet is connected to the air inlet of the radon monitor, and the air outlet of the radon monitor is connected to the third air inlet pipe.

9. The real-time monitoring system for low-flow discontinuous groundwater radon concentration according to claim 1, characterized in that: The cabinet is connected with a drain port on one side of the top of the water collection cavity.

10. A method for real-time monitoring of radon concentration in discontinuous groundwater with a small flow rate, based on a real-time monitoring system for radon concentration in discontinuous groundwater with a small flow rate according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. The trumpet-shaped opening of the drainage tube is fixed directly below the exposed water sample, and the lower end of the drainage tube is placed in the water collection cavity; S2. The water sample flows through the water valve into the first water inlet pipe of the water collection bottle in the water collection state and is stored in the water collection bottle. At this time, the first air outlet pipe, the first air inlet pipe, and the fourth drain pipe on the water collection bottle do not form a passage with the central cylinder. The gas in the water collection bottle is discharged through the exhaust mechanism, and the water level in the bottle continues to rise. S3. When the water level in the water collection bottle reaches the set value in step S2, the disc cylinder is rotated 90 degrees, and the water collection bottle enters a measuring state. The first outlet pipe is connected to the third outlet pipe, and the first inlet pipe is connected to the third inlet pipe. Radon gas escaping from the water collection bottle enters the radon concentration measuring device for radon concentration detection. After the detection is completed, the gas flows back to the water collection bottle through the third inlet pipe and the first inlet pipe; S4. When the radon concentration in the water collection bottle in step S3 is detected, the disc cylinder is driven to continue rotating 90 degrees in the same direction, the water collection bottle enters the drainage state, the fourth drain pipe is connected to the third drain pipe, the water level in the bottle continues to drop; S5. Continue to drive the disc cylinder to rotate 90 degrees in the same direction each time, so that each water collecting bottle on the disc cylinder undergoes steps S2 to S4 in sequence, realizing real-time monitoring of radon concentration in small-flow discontinuous water samples.

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