Automatic well washing and backwashing system and method for groundwater

Abstract

The embodiments of the present disclosure disclose an automatic well washing and backwashing system and method for underground water. A specific embodiment of the automatic well washing and backwashing system for underground water comprises: an air pump, a first tee joint, a two-position three-way electromagnetic valve, a normally closed two-position two-way electromagnetic valve, a pressure gauge, a check valve, a second tee joint, an air bag pump, an air bag pump drain pipe, an air bag pump air inlet pipe and a drain outlet. The embodiment is related to the field of ecological environment monitoring, can realize normal use of automatic well washing function in winter in the north without icing, effectively solve the problems of pipe freezing, air bag rupture and well washing failure in low-temperature environment in the field, ensure the representativeness of monitoring water samples and the reliability of data, and improve the application level of the automatic underground water monitoring system in the complex environment in the north.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of ecological environment monitoring, specifically to an automatic well flushing and backflushing system and method for groundwater. Background Technology

[0002] Currently, with increasing demand for groundwater environmental monitoring, the demand for automatic groundwater monitoring equipment / systems is also rising. Automatic groundwater monitoring equipment / systems generally consist of an automatic well-washing unit, an automatic monitoring unit, a control unit, and a power supply unit. To ensure the representativeness of groundwater monitoring results, the automatic well-washing equipment must first be activated to drain stagnant water from the groundwater well, ensuring that the monitored groundwater is fresh. Currently, the application of automatic groundwater monitoring equipment faces the following practical problems: Groundwater automatic monitoring equipment is installed in the field and generally lacks insulation. Since the outdoor temperature in northern winters can drop below 0°C, the automatic well-washing equipment may freeze and block the water pipes during operation. In severe cases, the airbag may rupture, causing the automatic well-washing function to fail and resulting in stagnant water in the groundwater well that cannot be drained, leading to poor representativeness of the water quality monitoring results.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background of the present disclosure concept, and therefore may contain information that does not form prior art known to those skilled in the art. Summary of the Invention

[0004] The summary portion of this disclosure is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description portion. This summary portion is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] Some embodiments of this disclosure propose an automatic well flushing and backflushing system and method for groundwater to solve the technical problems mentioned in the background section above.

[0006] In a first aspect, some embodiments of this disclosure provide an automatic groundwater well flushing and backflushing system, which includes: an air pump, a first three-way valve, a two-position three-way solenoid valve, a normally closed two-position two-way solenoid valve, a pressure gauge, a check valve, a second three-way valve, an airbag pump, an airbag pump drain pipe, an airbag pump inlet pipe, and a drain outlet.

[0007] Optionally, the air pump is physically connected to the first three-way valve; the first three-way valve is physically connected to the two-position three-way solenoid valve; the two-position three-way solenoid valve is electrically connected to the pressure gauge; and the two-position three-way solenoid valve is physically connected to the airbag pump through the airbag pump inlet pipe.

[0008] Optionally, the first three-way valve is physically connected to the normally closed two-position two-way solenoid valve; the check valve is physically connected to the normally closed two-position two-way solenoid valve and the second three-way valve respectively; the second three-way valve is physically connected to the airbag pump through the airbag pump drain pipe; and the second three-way valve is physically connected to the drain outlet.

[0009] Secondly, some embodiments of this disclosure provide an automatic groundwater well flushing and backflushing method, applied to an automatic groundwater well flushing and backflushing system as described in any embodiment of the first aspect, comprising: controlling the automatic groundwater well flushing and backflushing system to perform well flushing treatment to generate a well flushing end command; and in response to determining that the well flushing end command meets preset well flushing end conditions, controlling the automatic groundwater well flushing and backflushing system to perform backflushing and emptying treatment.

[0010] The above-described embodiments of this disclosure have the following beneficial effects: The automatic well-washing and backflushing system for groundwater, as described in some embodiments of this disclosure, enables normal operation of the automatic well-washing function in northern winters without freezing, effectively solving problems such as pipeline freezing, airbag rupture, and well-washing failure in low-temperature environments. It ensures the representativeness and reliability of monitored water samples, improving the application level of the automatic groundwater monitoring system in complex northern environments. Based on this, the automatic well-washing and backflushing system of some embodiments of this disclosure, firstly, achieves fully automatic operation of the "well-washing and water replacement—backflushing and emptying" process through programmed control of the coordinated opening and closing of the air pump, two-position three-way solenoid valve, and normally closed two-position two-way solenoid valve. This eliminates the conditions for pipeline water accumulation and freezing in winter from the root, ensuring the continuous reliability of the well-washing function and realizing integrated automatic control of well-washing and backflushing. Secondly, key valves such as the second three-way valve and one-way valve connected to the airbag pump drainage pipe are installed below the frozen soil layer inside the well, utilizing the constant temperature characteristics of the strata to prevent valve freezing; this completely solves problems such as pipeline freezing and airbag rupture in northern winters, achieving a dual low-temperature anti-freezing design. Next, through precise control of a two-position three-way solenoid valve and a normally closed two-position two-way solenoid valve, seamless switching between well washing and backflushing operations is achieved. Combined with real-time monitoring of the gas path pressure using a pressure gauge, this ensures safe and stable system operation, avoids gas path crosstalk and equipment failure, and enables precise gas path switching and reliable operation. Subsequently, an efficient well washing system using an airbag pump and a water quality stability judgment logic are employed to ensure that the monitored water sample is fresh groundwater. Chemically stable materials are used for the connecting pipelines, and the control valve layout is reasonable, facilitating maintenance without affecting the water sample quality, significantly reducing operation and maintenance costs, and achieving a balance between water sample representativeness and ease of maintenance. Attached Figure Description

[0011] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements are not necessarily drawn to scale.

[0012] Figure 1 These are schematic diagrams of some embodiments of the automatic well flushing and backflushing system for groundwater according to this disclosure; Figure 2 This is a flowchart of some embodiments of the automatic well flushing and backflushing method for groundwater according to the present disclosure. Detailed Implementation

[0013] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0014] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0015] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0016] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0017] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0018] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] Figure 1 A schematic diagram of the structure of some embodiments of the automatic well flushing and backflushing system for groundwater according to the present disclosure is shown. The automatic well flushing and backflushing system 100 for groundwater includes: an air pump 1, a first three-way valve 2, a two-position three-way solenoid valve 3, a normally closed two-position two-way solenoid valve 4, a pressure gauge 5, a one-way valve 6, a second three-way valve 7, an airbag pump 8, an airbag pump drain pipe 9, an airbag pump inlet pipe 10, and a drain outlet 11.

[0020] In some embodiments, the air pump 1 can be a device for generating compressed air. The first tee 2 and the second tee 7 can be tee fittings with three ports. The two-position three-way solenoid valve 3 can be an industrial control element with two operating positions and three flow port interfaces. The normally closed two-position two-way solenoid valve 4 can be an industrial control element with two operating positions and two flow port interfaces that automatically closes when powered off and opens when powered on. The pressure gauge 5 can be an instrument for monitoring the operating pressure of equipment (automatic well flushing and backflushing system for groundwater). The check valve 6 can be an automatic control valve with two ports that restricts the flow of compressed air from the normally closed two-position two-way solenoid valve 4 to the airbag pump 8 in one direction. The airbag pump 8 can be a device that uses compressed air to periodically expand and contract to achieve liquid transport. The airbag pump drain pipe 9 can be a pipe for draining water from the airbag pump 8. The airbag pump inlet pipe 10 can be a pipe for inleting air from the airbag pump 8. The drain outlet 11 can be a pipe for draining water from the well. Here, the airbag pump 8 includes the airbag pump drain pipe 9 and the airbag pump inlet pipe 10. The first three-way valve 2 may include a first port, a second port, and a third port. The two-position three-way solenoid valve 3 may include a first flow pipe port, a second flow pipe port, and a third flow pipe port. The normally closed two-position two-way solenoid valve 4 may include a first normally closed flow pipe port and a second normally closed flow pipe port. The check valve 6 may include a first valve port and a second valve port. The second three-way valve 7 may include a fourth port, a fifth port, and a sixth port.

[0021] Here, the air pump is initially in the off state. The two-position three-way solenoid valve is initially in the normally closed state with spring return (the air path does not connect to the airbag pump inlet pipe). The normally closed two-position two-way solenoid valve is initially in the closed state. The aforementioned airbag pump 8, the aforementioned second three-way valve 7, and the one-way valve 6, among other key valves, are installed below the permafrost layer inside the well.

[0022] Optionally, the air pump 1 is physically connected to the first three-way valve 2. The first three-way valve 2 is physically connected to the two-position three-way solenoid valve 3. The two-position three-way solenoid valve 3 is electrically connected to the pressure gauge 5. The two-position three-way solenoid valve 3 is physically connected to the airbag pump 8 through the airbag pump inlet pipe 10.

[0023] In some embodiments, the physical connection between the air pump 1 and the first three-way valve 2 can be achieved by inserting the air pump 1 into the first interface of the first three-way valve 2. The physical connection between the first three-way valve 2 and the two-position three-way solenoid valve 3 can be achieved by inserting the first flow pipe interface of the two-position three-way solenoid valve 3 into the second interface of the first three-way valve 2. The physical connection between the two-position three-way solenoid valve 3 and the airbag pump 8 via the airbag pump inlet pipe 10 can be achieved by inserting the second flow pipe interface of the two-position three-way solenoid valve 3 into the airbag pump inlet pipe 10 of the airbag pump 8. Here, the third flow pipe interface of the two-position three-way solenoid valve 3 is an exhaust port, connected to an exhaust pipe.

[0024] Optionally, the first three-way valve 2 is physically connected to the normally closed two-position two-way solenoid valve 4. The one-way valve 6 is physically connected to the normally closed two-position two-way solenoid valve 4 and the second three-way valve 7, respectively. The second three-way valve 7 is physically connected to the airbag pump 8 through the airbag pump drain pipe 9. The second three-way valve 7 is physically connected to the drain outlet 11.

[0025] In some embodiments, the physical connection between the first three-way valve 2 and the normally closed two-position two-way solenoid valve 4 can be achieved by inserting the first normally closed flow pipe interface of the normally closed two-position two-way solenoid valve 4 into the third interface of the first three-way valve 2. The physical connection between the one-way valve 6 and the normally closed two-position two-way solenoid valve 4 and the second three-way valve 7 can be achieved by first inserting the second normally closed flow pipe interface of the normally closed two-position two-way solenoid valve 4 into the first valve port of the one-way valve 6; and secondly, connecting the second valve port of the one-way valve 6 to the fourth interface of the second three-way valve 7 via a pipe. The physical connection between the second three-way valve 7 and the airbag pump 8 via the airbag pump drain pipe 9 can be achieved by connecting the fifth interface of the second three-way valve 7 to the airbag pump drain pipe 9 of the airbag pump 8 via a pipe. The physical connection between the second three-way valve 7 and the drain outlet 11 can be achieved by inserting the pipe of the drain outlet 11 into the sixth interface of the second three-way valve 7.

[0026] In operation, first, turn on the air pump and simultaneously open the two-position three-way solenoid valve. Next, control the air pump to generate compressed air, and deliver the compressed air from the air pump through the first three-way valve, the two-position three-way solenoid valve, and the airbag pump inlet pipe to the airbag pump. Then, drive the airbag pump to periodically suck and drain water, expelling stagnant water from the well through the airbag pump drain pipe to the wellhead. Next, close the two-position three-way solenoid valve, and then turn off the air pump. (This completes the well cleaning process.) Afterward, turn on the air pump and simultaneously open the normally closed two-position two-way solenoid valve. Then, control the air pump to generate compressed air, and deliver the compressed air from the air pump through the first three-way valve, the normally closed two-position two-way solenoid valve, the check valve, and the second three-way valve to the airbag pump drain pipe. Then, forcibly purge the residual water in the airbag pump drain pipe to expel the water from the drain outlet. Finally, first close the normally closed two-position two-way solenoid valve, and then turn off the air pump. (Thus, the backflushing and emptying process is completed.) Thus, through the automatic groundwater well washing and backflushing system, well washing can be carried out first, followed by backflushing and emptying. This allows residual water in the airbag pump drain pipe to be backflushed out, preventing well washing water from accumulating in the pipe and thus preventing the pipe from freezing and affecting the normal operation of well washing. Therefore, it can ensure the normal operation of well washing in winter.

[0027] Further reference Figure 2 This disclosure provides an automatic well flushing and backflushing method for groundwater, applicable to the automatic well flushing and backflushing systems of the above embodiments, such as... Figure 2 The diagram shows flowcharts of some embodiments of an automated well flushing and backflushing method for groundwater according to this disclosure. The method may include the following steps: Step 201: Control the above-mentioned automatic groundwater flushing and backflushing system to perform well flushing treatment, so as to generate a well flushing end command.

[0028] In some embodiments, the entity performing the automatic well flushing and backflushing method for groundwater (e.g.) Figure 1 The groundwater automatic well flushing and backflushing system 100 shown can control the above-mentioned groundwater automatic well flushing and backflushing system to perform well flushing treatment and generate a well flushing end command.

[0029] In practice, the aforementioned implementing entity can control the above-mentioned automatic groundwater well flushing and backflushing system to perform well flushing treatment through the following steps to generate a well flushing completion command: The first step is to control the opening of the air pump and the two-position three-way solenoid valve, and to determine the well-washing start time. In practice, firstly, the aforementioned actuators can simultaneously open the air pump and the two-position three-way solenoid valve. Here, the opening state of the two-position three-way solenoid valve can be: the coil is energized, the valve core is switched, and the air path is connected to the air inlet pipe of the airbag pump. Secondly, the aforementioned actuators can determine the well-washing start time as the time when the two-position three-way solenoid valve is opened.

[0030] The second step involves controlling the aforementioned air pump to generate compressed air, and then delivering the compressed air through the first three-way valve to the aforementioned two-position three-way solenoid valve. In practice, the aforementioned actuator can control the air pump to be energized to generate stable compressed air, and deliver the compressed air through the first three-way valve to the aforementioned two-position three-way solenoid valve.

[0031] The third step is to control the two three-way solenoid valves mentioned above to deliver compressed air through the air intake pipe of the airbag pump to the airbag pump.

[0032] The fourth step is to control the aforementioned airbag pump to perform periodic water intake and drainage.

[0033] The fifth step is to determine the well-washing completion information based on the well-washing start time mentioned above.

[0034] Step 6: In response to determining that the above-mentioned well-washing completion information meets the preset well-washing completion conditions, the above-mentioned two-position three-way solenoid valve and the above-mentioned air pump are closed, and the preset completion information is determined as a well-washing end command. The preset well-washing completion conditions can be: the well-washing completion information is information indicating "well-washing treatment has been completed"; or the preset completion information is information indicating "well-washing treatment has been completed and backflushing and venting treatment is required." In practice, in response to determining that the above-mentioned well-washing completion information meets the preset well-washing completion conditions, the above-mentioned executing entity can first close the two-position three-way solenoid valve, then close the air pump, and can determine the preset completion information as a well-washing end command. Here, the closed state of the two-position three-way solenoid valve can be: the coil is de-energized, the valve core is reset, and the air path to the airbag pump is cut off.

[0035] In practice, the aforementioned implementing entity can control the airbag pump to periodically suck in and drain water through the following steps: The first step is to drive the airbags inside the aforementioned airbag pump to periodically expand and contract.

[0036] The second step is to drain the stagnant water in the well through the airbag pump drain pipe and the second / third valve to the drain outlet. Here, the stagnant water in the well can be water that has been stagnant in the well for a long time.

[0037] In practice, the aforementioned implementing entity can drive the internal airbag of the aforementioned airbag pump to periodically expand and contract through the following steps: First, in response to determining that the above-mentioned airbag pump meets the preset contraction conditions, the following contraction steps are performed: The airbag inside the aforementioned airbag pump contracts, squeezing out the stagnant water inside the well and allowing it to be discharged through the airbag pump's drain pipe. The preset contraction condition can be the entry of compressed air into the airbag pump.

[0038] The second step, in response to determining that the airbag pump meets the preset inflation conditions, is to perform the following inflation steps: The airbag inside the aforementioned airbag pump expands, allowing fresh groundwater from the well to enter the pump under pressure differential. The pre-set expansion condition can be that no compressed air enters the airbag pump. The fresh groundwater in the well can be uncontaminated water from an underground aquifer.

[0039] In practice, the aforementioned implementing entity can determine the well-washing completion information based on the well-washing initiation time using the following steps: The first step is to acquire water quality parameter information, discharge volume, and preset end command. In practice, the aforementioned executing entity can acquire water quality parameter information, discharge volume, and preset end command from the terminal device via wired or wireless connection. The water quality parameter information can be real-time collected water quality readings of the water discharged through the drain outlet. The water quality parameter information can include a sequence of water quality readings. (Where the water quality readings in the sequence are arranged in chronological order. For example, the time interval between two adjacent water quality readings in the sequence can be five minutes.) The water quality readings in the sequence can include, but are not limited to, at least one of the following: conductivity, turbidity, conductivity deviation, and turbidity deviation. Here, conductivity deviation can be the deviation between the conductivity included in the current water quality reading and the conductivity included in the previous water quality reading. Here, the previous water quality reading can be the water quality reading preceding the current water quality reading in the sequence. Turbidity deviation can be the difference between the turbidity included in the water quality reading and the turbidity included in the previous water quality reading (turbidity deviation = (turbidity included in the previous water quality reading - turbidity included in the previous water quality reading) ÷ turbidity included in the previous water quality reading). Discharge volume can be the amount of water discharged through the drain outlet. The preset end command indicates that the user wants to end the well-washing process.

[0040] It should be noted that the aforementioned wireless connection methods may include, but are not limited to, 3G / 4G connection, WiFi connection, Bluetooth connection, WiMAX connection, Zigbee connection, UWB (ultra wideband) connection, and other currently known or future wireless connection methods.

[0041] The second step involves determining the first completion information in response to the determination that the aforementioned water quality parameter information meets the first preset completion condition. The first preset completion condition may be that three consecutive water quality readings in the sequence of water quality readings included in the water quality parameter information meet preset water quality conditions. Here, the preset water quality conditions may be that the conductivity deviation and turbidity deviation included in the water quality readings are both less than 5%. In practice, in response to the determination that the aforementioned water quality parameter information meets the first preset completion condition, the executing entity may determine the information representing "well washing completed" as the first completion information.

[0042] The third step is to determine the current time as the well-washing completion time.

[0043] The fourth step is to determine the difference between the well-washing completion time and the well-washing start time as the well-washing duration.

[0044] Fifth, in response to determining that the well-washing duration meets the second preset completion condition, the second completion information is determined. The second preset completion condition can be that the well-washing duration is greater than or equal to a preset duration. For example, the preset duration could be 30 minutes. In practice, in response to determining that the well-washing duration meets the second preset completion condition, the executing entity can determine the information representing "well-washing completed" as the second completion information.

[0045] Step 6: In response to determining that the above-mentioned drainage volume meets the third preset completion condition, determine the third completion information. The third preset completion condition may be: the drainage volume is greater than or equal to a preset drainage volume. For example, the preset drainage volume may be three times the well volume. In practice, in response to determining that the above-mentioned drainage volume meets the third preset completion condition, the executing entity may determine the information representing "well washing completed" as the third completion information.

[0046] Step 7: In response to determining that the aforementioned preset end command satisfies the fourth preset completion condition, determine the fourth completion information. The fourth preset completion condition may be that the preset end command indicates the user wants to end the well-washing process. In practice, the executing entity may determine the information indicating "well-washing completed" as the fourth completion information.

[0047] Step 8: In response to determining that the first completion information, the second completion information, the third completion information, and the fourth completion information satisfy the preset well-washing conditions, the preset well-washing completion information is determined as the well-washing completion information. The preset well-washing conditions can be: the first completion information indicating well-washing completion; or the second completion information indicating well-washing completion; or the third completion information indicating well-washing completion; or the fourth completion information indicating well-washing completion. Here, the preset well-washing completion information can be information indicating that "well-washing treatment has been completed."

[0048] Step 202: In response to determining that the above-mentioned well washing end command meets the preset well washing end conditions, control the above-mentioned automatic groundwater well washing backflushing system to perform backflushing and emptying treatment.

[0049] In some embodiments, the execution entity may, in response to determining that the well-washing end command meets the preset well-washing end condition, control the automatic groundwater well-washing backflushing system to perform backflushing and emptying treatment. The preset well-washing end condition may be: the well-washing end command indicates that "well-washing treatment has been completed and backflushing and emptying treatment is required."

[0050] In practice, the aforementioned implementing entity can respond to the determination that the aforementioned well-washing end command meets the preset well-washing end conditions by controlling the aforementioned automatic groundwater well-washing backflushing system to perform backflushing and emptying treatment through the following steps: The first step is to turn on the air pump and the normally closed two-position two-way solenoid valve, and determine the backflush opening time. In practice, firstly, the aforementioned actuator can simultaneously turn on the air pump and the normally closed two-position two-way solenoid valve. Here, the normally closed two-position two-way solenoid valve can be in the following state: the coil is energized, the valve core is open, and the air path is open. Secondly, the aforementioned actuator can determine the backflush opening time as the time when the normally closed two-position two-way solenoid valve is opened.

[0051] The second step involves controlling the aforementioned air pump to generate compressed air, and then delivering the compressed air through the first three-way valve to the normally closed two-position two-way solenoid valve. In practice, the aforementioned actuator can control the air pump to be energized to generate stable compressed air, and deliver the compressed air through the first three-way valve to the normally closed two-position two-way solenoid valve.

[0052] The third step is to control the normally closed two-position two-way solenoid valve to deliver compressed air through the check valve and the second and third-position valves to the airbag pump drain pipe.

[0053] The fourth step involves forcibly purging the residual water in the airbag pump's drain pipe to expel it through the second and third fittings from the drain outlet. This residual water can be water remaining inside the airbag pump's drain pipe. This process purges the residual water from the section of pipe closest to the ground, preventing freezing. The airbag pump itself is located in groundwater, typically several meters below the surface, where the temperature is around 15 degrees Celsius in winter, preventing freezing.

[0054] Fifth, based on the aforementioned backflushing start time, determine the backflushing duration.

[0055] Step 6: In response to determining that the backflush duration meets the preset backflush condition, close the normally closed two-position two-way solenoid valve and the air pump. The preset backflush condition can be that the backflush duration is within a preset backflush range. For example, the preset backflush range can be 30 seconds to one minute. In practice, in response to determining that the backflush duration meets the preset backflush condition, the actuator can first close the normally closed two-position two-way solenoid valve, and then close the air pump. Here, the normally closed two-position two-way solenoid valve can be in a closed state where the coil is de-energized and the valve core is closed.

[0056] In practice, the aforementioned implementing entities can determine the backflush duration based on the backflush initiation time using the following steps: The first step is to determine the current time as the end time of the backflush.

[0057] The second step is to determine the difference between the backflushing end time and the backflushing start time as the backflushing duration.

[0058] Therefore, firstly, this disclosure utilizes a programmed backflushing and evacuation process to completely purge and discharge residual water samples from the airbag pump drain pipe after well washing, eliminating the conditions for water accumulation and freezing in the pipeline at the source. It also effectively avoids pipeline blockage, airbag rupture, and valve jamming caused by low temperatures in northern winters. Compared to traditional well washing systems, this disclosure can still stably achieve automatic well washing in extreme low-temperature environments below -30℃, completely solving the industry problem of well washing failure in winter and ensuring the continuity of groundwater monitoring. Therefore, it completely solves the problem of low-temperature freezing and blockage, ensuring the continuous reliability of the well washing function. Secondly, by using compressed air to drive the airbag pump for efficient well washing, it can quickly replace stagnant water in the monitoring well. Furthermore, the control unit can accurately determine the well washing endpoint based on the stability of water quality parameters and the well washing time / volume, ensuring that the extracted water sample is fresh groundwater in situ within the well. This significantly improves the authenticity, accuracy, and comparability of groundwater monitoring data, thus ensuring the representativeness of the monitored water samples and improving the accuracy of the monitoring data. Next, the entire well-washing and backflushing process is automatically executed by the control unit according to a preset program, requiring no manual on-site operation. This effectively solves the problems of high difficulty and cost of manual operation and maintenance at remote field sites in northern regions. Through backflushing and low-temperature protection design, the system significantly reduces the failure rate of pipeline freezing and equipment damage, reduces the frequency of equipment repair and replacement, and further reduces the time and financial costs of subsequent operation and maintenance. Therefore, it can achieve automated operation, reducing operation and maintenance costs and labor intensity. Then, the stagnant water discharged from the well-washing is directly returned to the field environment. The backflushing process only uses compressed air for purging, without the need to add antifreeze, cleaning agents, or other chemical reagents. The cleaning method of ozone algae removal and compressed air backflushing not only prevents pipeline blockage and inhibits bacteria, but also does not cause secondary pollution to groundwater and the surrounding ecological environment, meeting the requirements of ecological environmental protection. Therefore, it can achieve green and environmentally friendly operation without secondary pollution.

[0059] Computer program code for performing operations of some embodiments of this disclosure can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0060] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0061] The functions described above in this document can be performed at least in part by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), complex programmable logic devices (CPLDs), and so on.

[0062] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. An automatic well flushing and backflushing system for groundwater, characterized in that, include: Air pump, first three-way valve, two-position three-way solenoid valve, normally closed two-position two-way solenoid valve, pressure gauge, check valve, second three-way valve, airbag pump, airbag pump drain pipe, airbag pump inlet pipe, drain port, among which, The air pump is physically connected to the first three-way valve; The first three-way valve is physically connected to the two-position three-way solenoid valve; The two-position three-way solenoid valve is connected to the pressure gauge circuit. The two-position three-way solenoid valve is physically connected to the airbag pump through the airbag pump inlet pipe. The first three-way valve is physically connected to the normally closed two-position two-way solenoid valve. The one-way valve is physically connected to the normally closed two-position two-way solenoid valve and the second three-way valve, respectively. The second three-way valve is physically connected to the airbag pump through the airbag pump drain pipe; The second tee is physically connected to the drain outlet.

2. An automatic well flushing and backflushing method for groundwater, applied to the automatic well flushing and backflushing system for groundwater as described in claim 1, characterized in that, include: The automatic groundwater well flushing and backflushing system is controlled to perform well flushing treatment, so as to generate a well flushing end command; In response to determining that the well-washing end command meets the preset well-washing end conditions, the automatic groundwater well-washing backflushing system is controlled to perform backflushing and emptying treatment.

3. The automatic well flushing and backflushing method for groundwater according to claim 2, characterized in that, The control of the automatic groundwater well flushing and backflushing system to perform well flushing treatment and generate a well flushing end command includes: Control the air pump and the two-position three-way solenoid valve to open, and determine the well washing start time; Control the air pump to generate compressed air, and deliver the compressed air through the first three-way valve to the two-position three-way solenoid valve; The two-position three-way solenoid valve controls the compressed air to be delivered to the airbag pump through the airbag pump inlet pipe; The airbag pump is controlled to periodically draw in and drain water; Based on the well-washing start time, determine the well-washing completion information; In response to determining that the well-washing completion information meets the preset well-washing completion conditions, the two-position three-way solenoid valve and the air pump are closed, and the preset completion information is determined as a well-washing end command.

4. The automatic well flushing and backflushing method for groundwater according to claim 3, characterized in that, The control of the airbag pump to periodically draw in and drain water includes: The airbag inside the airbag pump is periodically expanded and contracted. The water trapped in the well is discharged through the airbag pump drain pipe and the second and third fittings to the drain outlet.

5. The automatic well flushing and backflushing method for groundwater according to claim 4, characterized in that, The process of periodically inflating and contracting the airbag inside the airbag pump includes: In response to determining that the airbag pump meets the preset contraction conditions, the following contraction steps are performed: The airbag inside the airbag pump is pushed to contract, thereby squeezing out the water trapped inside the well and allowing it to be discharged through the airbag pump's drain pipe. In response to determining that the airbag pump meets the preset inflation conditions, the following inflation steps are performed: The airbag inside the airbag pump expands, and fresh groundwater from the well is replenished into the airbag pump under the action of pressure difference.

6. The automatic well flushing and backflushing method for groundwater according to claim 3, characterized in that, The determination of well-washing completion information based on the well-washing initiation time includes: Acquire water quality parameters, discharge volume, and preset end command; In response to determining that the water quality parameter information meets the first preset completion condition, the first completion information is determined; Set the current time as the well cleaning completion time; The difference between the well-washing completion time and the well-washing start time is determined as the well-washing duration; In response to determining that the well washing time meets the second preset completion condition, second completion information is determined; In response to determining that the drainage volume meets the third preset completion condition, third completion information is determined; In response to determining that the preset end command satisfies the fourth preset completion condition, the fourth completion information is determined; In response to determining that the first completion information, the second completion information, the third completion information, and the fourth completion information satisfy the preset well washing conditions, the preset well washing completion information is determined as well washing completion information.

7. The automatic well flushing and backflushing method for groundwater according to claim 2, characterized in that, The control of the automatic groundwater well flushing and backflushing system for backflushing and emptying includes: Turn on the air pump and the normally closed two-position two-way solenoid valve, and determine the backflush start time; Control the air pump to generate compressed air, and deliver the compressed air through the first three-way valve to the normally closed two-position two-way solenoid valve; The normally closed two-position two-way solenoid valve controls the compressed air to be delivered to the airbag pump drain pipe through the one-way valve and the second and third-way valves. The residual water in the drain pipe of the airbag pump is forcibly purged so that the residual water is discharged from the drain outlet through the second three-way valve; The backflush duration is determined based on the backflush start time. In response to determining that the backflush duration meets the preset backflush conditions, the normally closed two-position two-way solenoid valve and the air pump are closed.

8. The automatic well flushing and backflushing method for groundwater according to claim 7, characterized in that, The determination of the backflush duration based on the backflush initiation time includes: Set the current time as the end time of the backflush; The difference between the backflushing end time and the backflushing start time is determined as the backflushing duration.

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