CN220039580U - Resistance type water level monitoring device with underground water density measurement function - Google Patents
Resistance type water level monitoring device with underground water density measurement function Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 177
- 238000012806 monitoring device Methods 0.000 title claims abstract description 28
- 238000001739 density measurement Methods 0.000 title claims description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 17
- 230000006698 induction Effects 0.000 claims description 63
- 239000003673 groundwater Substances 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000005259 measurement Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 description 11
- 238000002360 preparation method Methods 0.000 description 7
- 230000001133 acceleration Effects 0.000 description 6
- 239000013049 sediment Substances 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
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- 238000001556 precipitation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a resistance type water level monitoring device with an underground water density measuring function, which comprises a power supply module, a monitoring analysis module, a communication module, a water level measuring module and an underground water density measuring module, wherein the power supply module, the monitoring analysis module, the communication module, the water level measuring module and the underground water density measuring module are arranged on an installation platform; the water level measuring module can calculate the current underground water level elevation in real time through the change of the reading of the first ammeter, and remotely transmit the calculated result through the communication module; the underground water density at any moment can be calculated through the reading change of the second ammeter and the initial density of the underground water, the current underground water level elevation can be obtained more accurately according to the underground water density at any moment, the measuring precision of the resistance type water level monitoring device in the scheme is high, the measuring is convenient, the measuring result has practical reference value, and the problem that the measuring result of the water level elevation is inaccurate due to the fact that the water level meter in the prior art ignores the change of the underground water density can be solved.
Description
Technical Field
The utility model relates to the technical field of water level monitoring, in particular to a resistance type water level monitoring device with an underground water density measuring function.
Background
Groundwater monitoring is a basic work of departments such as water conservancy, environment, geology, traffic, agriculture, etc. The system performs monitoring work of factors such as groundwater level, water quality and water temperature, plays an important role in management, protection, utilization and the like of water resources, and has important significance for economic development and life of people in China. In addition, ground water level monitoring is carried out on geological disasters such as landslide, stability influence factors of the geological disasters such as landslide can be further known, deformation trend of the geological disasters such as landslide is further judged, and life and property safety of people is better ensured.
The density of groundwater in different areas is different, and heavy rainfall can make the water turbid, and the density of groundwater can change, and when the mineralization degree of water changes in addition, all probably causes the change of groundwater density, promptly in actual groundwater level monitoring process, the density of groundwater is at any time changing, and uses wider pressure type fluviograph and float type fluviograph among the prior art, when measuring the height of groundwater, has following problem:
1. when the pressure type water level meter in the prior art measures the underground water level, the change of the underground water density is ignored, and under the condition of the underground water density change, the deviation between the underground water level measurement result and the actual underground water level is possibly caused to be large, and the measurement result cannot meet the requirement of high-precision or accurate measurement.
2. The pressure-sensitive sensor is arranged at the bottom of underground water in the traditional pressure type water level gauge, so that the electric element in the water level monitoring device is easy to be damaged by water inflow, and the water level monitoring device is required to be lifted to the water surface when the whole water level monitoring device is installed and maintained, so that the installation and maintenance are very inconvenient, and the efficiency of the installation and maintenance is reduced. In addition, the soil body collapses or sediment deposits, and the traditional pressure type water level gauge is easy to be buried, so that the accuracy of a measuring result is influenced, and even the instrument cannot be normally used.
3. The float type water level gauge is easy to be clamped in the use process, and has a plurality of inconveniences in installation and maintenance.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a resistance type water level monitoring device with an underground water density measuring function, which solves the problem that the water level height measuring result is inaccurate due to neglecting the change of the underground water density in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the resistance type water level monitoring device with the underground water density measuring function comprises a mounting rack arranged on the ground surface, wherein a mounting platform is arranged on the mounting rack, and a power supply module, a monitoring analysis module, a communication module, a water level measuring module and an underground water density measuring module are arranged on the mounting platform;
the water level measurement module comprises a first resistor rod vertically fixed on the mounting platform, a first cylindrical spring is arranged on one side of the first resistor rod, the axis of the first cylindrical spring is parallel to the axis of the first resistor rod, the bottom of the first cylindrical spring is fixed with the mounting platform, the top of the first cylindrical spring is fixedly connected with a first insulating hard plate, the upper surface of the first insulating hard plate is provided with a first conductive piece in sliding connection with the outer wall of the first resistor rod, the first resistor rod and the first conductive piece are connected in series with the power module through a wire, and a first ammeter in electric connection with the monitoring analysis module is connected in series on a circuit of the water level measurement module; an induction pipe with a sealing structure is arranged below the first insulating hard plate, the top of the induction pipe is higher than the annual highest water level line, and the top of the induction pipe passes through the middle part of the first cylindrical spring through a steel wire rope to be connected with the lower surface of the first insulating hard plate; when the density of the induction pipe is greater than that of groundwater, the bottom of the induction pipe does not need a counterweight body, when the density of the induction pipe is less than that of groundwater, the bottom of the induction pipe is connected with the counterweight body, the counterweight body is arranged below the annual lowest water level line of groundwater, and the counterweight body is in a suspended state.
The underground water density measuring module comprises a second resistor rod vertically fixed on the mounting platform, a second cylindrical spring is arranged on one side of the second resistor rod, the axis of the second cylindrical spring is parallel to the axis of the second resistor rod, the bottom of the second cylindrical spring is fixed with the mounting platform, the top of the second cylindrical spring is fixedly connected with a second insulating hard plate, the upper surface of the second insulating hard plate is provided with a second conductive piece which is in sliding connection with the outer wall of the second resistor rod, the second resistor rod and the second conductive piece are connected with the power module in series through a wire, and a second ammeter which is electrically connected with the monitoring analysis module is connected in series on a circuit of the underground water density measuring module; a reference body is arranged below the second insulating hard plate, penetrates through the middle of the second cylindrical spring through a steel wire rope and is connected with the lower surface of the second insulating hard plate, and the reference body is arranged below the annual lowest water line of the monitored point;
the first resistor rod and the second resistor rod are made of the same material, the first resistor rod and the second resistor rod are connected in parallel, and specifically, the first resistor rod and the second resistor rod are made of materials with resistivity which does not change greatly with the ambient temperature, and the resistivity of the materials can be regarded as a constant value.
Further, as a specific structure of the first conductive member and the second conductive member, the first conductive member and the second conductive member each comprise a flat sheet metal sheet and a metal annular sleeve, the side wall of the metal annular sleeve is fixedly connected with one end of the flat sheet metal sheet, the metal annular sleeve is sleeved on the outer wall of the first resistor rod or the second resistor rod, and the inner wall of the metal annular sleeve is in sliding contact with the outer wall of the first resistor rod or the second resistor rod; the lower surface of the flat sheet metal is fixedly connected with the upper surface of the first insulating hard plate or the second insulating hard plate.
Further, the circuit in the resistive water level monitoring device in the scheme adopts direct current, specifically, the power module is a direct current power supply, the communication module is a wireless communication module, and the first ammeter and the second ammeter are both digital display direct current ammeter.
Further, in order to avoid that sediment at the water bottom is attached to the top of the counterweight body to influence the weight of the counterweight body and cause measurement errors, the top of the counterweight body is in a conical structure with the small end upwards or a hemispherical structure with the round end upwards.
Further, in order to enable the length of the induction tube to be conveniently adjusted so as to adapt to different measuring environments, the induction tube comprises a plurality of sections of tube bodies which are of hollow sealing structures, a thread groove is formed in the top of each section of tube body, a thread end is arranged in a protruding mode at the bottom of each section of tube body, the distance between the upper surface of the tube body and the end face of the thread end is 0.5 m-4 m, and two adjacent sections of tube bodies are connected in a mode of matching the thread groove with the thread end; the bottom of the tube body positioned at the bottom end of the induction tube is connected with the top surface of the counterweight body by a threaded end.
Further, as a specific structure of the reference body, the reference body is a sphere structure.
Further, the thread groove and the thread end are spliced in a sealing way, and after the induction pipe is spliced in a multi-section way, the diameter of the pipe body of the induction pipe is consistent with the diameter of the pipe body
The basic principle of the resistance type water level monitoring device in the scheme is as follows: when the liquid level of the underground water level changes, the buoyancy received by the induction tube also changes correspondingly, such as the liquid level of the underground water level rises, the buoyancy received by the induction tube increases at the moment, the induction tube and the counterweight body are driven to rise, the downward tension received by the first insulating hard plate is reduced at the moment, the first insulating hard plate drives the first conductive piece to rise under the upward thrust action of the cylindrical spring, the resistance value of the first resistor rod connected into the circuit is increased, and the current change in the circuit is measured by the monitoring analysis module according to the first ammeter, so that the current underground water level elevation is calculated in real time.
The specific calculation process is as follows: when the water level monitoring device is installed, the initial elevation of the underground water level is H 0 The initial length of the first resistor rod access circuit is L, and the initial elevation of the top surface of the counterweight body is h 0 The first current meter measures current as I; when the water level elevation changes to H, the length of the first resistor rod connected into the circuit changes to L ', and the current measured by the first ammeter is I'; the resistivity of the first resistor rod is rho, the cross-sectional area is S, the voltage of the power supply module is U, the gravity of the three parts of the steel wire rope, the induction tube and the counterweight body is G, the stiffness coefficient of the first cylindrical spring is k, the underground water density is a, the gravity acceleration is G, the volume of the counterweight body is V, the cross-sectional area of the induction tube is S', and the length of the first resistor rod connected into a circuit when the steel wire rope, the induction tube and the counterweight body are not hung below the first insulating hard plate is L 0 Then:
U/I＝(ρL)/S 1)
U/I＇＝(ρL＇)/S 2)
G-agV-agS＇(H 0 -h 0 )＝k(L 0 -L) 3)
G-agV-agS＇{H-[h 0 +(L＇-L)]}＝k(L 0 -L＇) 4)
from equation 1) it follows:
L＝US/(ρI)5)
from equation 2) it follows:
L＇＝US/(ρI＇)6)
from equations 3) and 4):
H＝H 0 +L＇-L+k(L＇-L)/(agS＇)＝H 0 +[1+k/(agS＇)]·(L＇-L)7)
substituting equations 5) and 6) into equation 7) yields:
H＝H 0 +[1+k/(agS＇)]·[US/(ρI＇)-US/(ρI)]8)
in equation 8), the initial elevation H of the groundwater level 0 The resistivity ρ, the cross-sectional area S, the sensing tube cross-sectional area S ', the voltage U of the power supply, the stiffness coefficient k of the first cylindrical spring, and the gravitational acceleration g of the first cylindrical spring are all known, the currents I and I' are measured by the first ammeter, and the underground is obtainedThe water density a is brought into the formula 8), and the groundwater level elevation H at any moment can be obtained.
Because the density of the underground water is not always unchanged, the density of the underground water in different areas is different, the water body is turbid due to heavy rainfall, the density of the underground water can be changed, and in addition, when the mineralization degree of the water body is changed, the density of the underground water body can be changed at any time in the actual underground water level monitoring process; when the density of the underground water changes, the buoyancy of the reference body changes along with the change, the buoyancy of the reference body changes to cause the downward pulling force of the second insulating hard plate to change, so that the position of the second insulating plate rises or falls to drive the position of the second conductive piece to change correspondingly, further affecting the resistance value of the second resistor rod connected into the circuit, changing the current in the circuit, and monitoring and analyzing the change of the current in the circuit according to the reading of the second ammeter by the analyzing module to obtain the current density of the underground water, thereby solving the problem of inaccurate measuring result caused by the fact that the water level meter ignores the change of the density in the prior art. The specific algorithm is as follows:
when the initial elevation of the underground water level is H 0 When the initial density of the ground water is set as a, the initial length of the second resistor rod access circuit is set as L 2 The initial current measured by the second ammeter is I 2 The method comprises the steps of carrying out a first treatment on the surface of the When the water level changes to H, the water level of the underground water changes to a', and the length of the second resistor rod connected to the circuit changes to L 2 The current measured by the second ammeter is I 2 'S'; the voltage of the power supply module is U, the resistivity of the second resistor rod is rho, and the cross section area is S 2 The reference volume is V 1 Then:
U/I 2 ＝ρL 2 /S 2 9)
U/I 2 ＇＝(ρ·L 2 ＇)/S 2 10)
k(L 2 ＇-L 2 )＝(a＇-a)gV 1 11)
from equation 9), equation 10), and equation 11):
a＇＝k[US 2 /(ρ·I 2 ＇)-US 2 /(ρ·I 2 )]/(gV 1 )+a 12)
in equation 12), the initial density of groundwater, a power voltage, U, a resistivity ρ of the second resistive rod, a cross-sectional area, S 2 Reference volume V 1 The stiffness coefficient k of the second cylindrical spring is known for the gravitational acceleration g, the current I measured by the second ammeter 2 And I 2 "groundwater density a" at any time can be calculated from equation 12).
Substituting the groundwater density a' at any moment into the formula 8) to obtain the groundwater level elevation at the corresponding moment under the circumstance of groundwater density change.
The beneficial effects of the utility model are as follows: according to the resistance type water level monitoring device with the underground water density measuring function, the current underground water level elevation can be calculated in real time through the change of the reading of the first ammeter, and the calculated result is transmitted remotely through the communication module; according to the underground water density measuring module, the underground water density a 'at any moment can be calculated through the reading change of the second ammeter and the initial density of the underground water, and the underground water level elevation after the underground water density change can be obtained more accurately according to the underground water density a' at any moment.
Drawings
Fig. 1 is a schematic structural diagram of a resistive water level monitoring device with a real-time water level monitoring function in the present solution.
Fig. 2 is a schematic structural diagram of the first conductive member or the second conductive member.
Fig. 3 is a schematic structural diagram of the induction tube.
1, a mounting rack; 2. a mounting platform; 3. a power module; 4. a monitoring and analyzing module; 5. a communication module; 6. a first resistor rod; 7. a first cylindrical spring; 8. a first insulating hard plate; 9. a first conductive member; 10. a first ammeter; 11. an induction tube; 1101. a tube body; 1102. a thread groove; 1103. a threaded end; 12. a counterweight body; 13. a second resistor rod; 14. a second cylindrical spring; 15. a second insulating hard plate; 16. a second conductive member; 17. a second ammeter; 18. a reference body; 19. a flat sheet metal sheet; 20. a metal annular sleeve.
Detailed Description
The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.
As shown in fig. 1 to 3, the utility model provides a resistance type water level monitoring device with a real-time water level monitoring function, which comprises a mounting frame 1 arranged on the ground surface, wherein a mounting platform 2 is arranged on the mounting frame 1, and a power module 3, a monitoring analysis module 4, a communication module 5, a water level measuring module and an underground water level measuring module are arranged on the mounting platform 2.
The installation platform 2 and the installation frame 1 are arranged, so that the installation and maintenance of the whole resistance type water level monitoring device are facilitated; the monitoring and analyzing module 4 can be a PLC processor for processing and calculating data, and the communication module 5 is a PLC dedicated wireless communication module.
The water level measurement module comprises a first resistor rod 6 vertically fixed on the mounting platform 2, a first cylindrical spring 7 is arranged on one side of the first resistor rod 6, the axis of the first cylindrical spring 7 is parallel to the axis of the first resistor rod 6, the bottom of the first cylindrical spring 7 is fixed with the mounting platform 2, the top of the first cylindrical spring 7 is fixedly connected with a first insulating hard plate 8, the upper surface of the first insulating hard plate 8 is provided with a first conductive piece 9 which is slidably connected with the outer wall of the first resistor rod 6, the first resistor rod 6 and the first conductive piece 9 are connected with the power module 3 in series through wires, and a first ammeter 10 which is electrically connected with the monitoring analysis module 4 is connected in series on a circuit of the water level measurement module. The first resistor rod 6 is made of a material with resistivity which does not change greatly with the ambient temperature, and the resistivity can be regarded as a constant value; the first conductive member 9 is made of a material with extremely low resistance, and the resistance value is negligible and can be regarded as a wire. An induction pipe 11 with a sealing structure is arranged below the first insulating hard plate 8, the top of the induction pipe 11 is higher than the annual highest underground water level, the top of the induction pipe 11 passes through the middle of the first cylindrical spring 7 through a steel wire rope to be connected with the lower surface of the first insulating hard plate 8, when the density of the induction pipe 11 is higher than that of the underground water, the bottom of the induction pipe is not required to be connected with a counterweight 12, when the density of the induction pipe 11 is lower than that of the underground water, the bottom of the induction pipe 11 is connected with a counterweight 12, the counterweight 12 is arranged below the annual lowest water level of the underground water, and the counterweight 12 is in a suspended state; as a specific embodiment of the induction pipe 11, the induction pipe 11 comprises a plurality of sections of pipe bodies 1101 with hollow sealing structures, a thread groove 1102 is formed in the top of each section of pipe body 1101, a thread end 1103 is arranged at the bottom in a protruding mode, the distance between the upper surface of the pipe body 1101 and the end surface of the thread end 1103 is 0.5 m-4 m, and two adjacent sections of pipe bodies 1101 are connected in a matched mode through the thread groove 1102 and the thread end 1103; the bottom of the tube 1101 at the bottom end of the induction tube 11 is connected with the top surface of the counterweight 12 by the threaded end 1103, so that the length of the induction tube 11 is convenient to adjust to adapt to different measuring environments, and meanwhile, the counterweight 12 matched with the induction tube 11 can be selected according to the length of the induction tube 11, thereby ensuring that the measuring range of the device is effective. The distance between the upper surface of the tube 1101 and the end surface of the threaded end 1103 is 0.5 m-4 m, so as to facilitate transportation and carrying in the actual use process; the steel wire rope is made of a material with high strength, and the length of the steel wire rope stretches less and can be ignored under the condition of tension and temperature change.
The thread groove 1102 and the thread end 1103 are spliced in a sealing manner, and after the induction pipe 11 is spliced in a plurality of sections, the diameter of the pipe body of the induction pipe 11 is identical to the diameter of the pipe body 1101.
The structure of the combination of the induction pipe 11 and the counterweight body 12 is adopted, so that the device is more convenient to transport and carry in the actual use process, and the weight of the induction pipe 11 body can be saved as much as possible in the actual use process by adopting the structure of the induction pipe 11, thereby being convenient to transport and carry; the counterweight body 12 is made of a material with high density, and the volume and the length of the counterweight body can be optimally adjusted according to the density and the measured measuring range requirement of the induction pipe 11 and the installation length of the induction pipe 11, so that the steel wire rope is not loosened and is always in a straightened state even if the water level rising induction pipe 11 is completely submerged after the device is installed. The concrete explanation is as follows:
let the density of the induction tube 11 be ρ Feel of the sense The cross-sectional area is S, the total installation length is h, and the groundwater density is ρ Water and its preparation method The density of the weight 12 is ρ Matching with When the density of the weight body 12 is fixed, the minimum volume of the weight body required by the device to normally work is V when the induction pipe 11 is completely submerged Matching with Then:
ρ water and its preparation method gSh-ρ Feel of the sense gSh＝ρ Matching with gV Matching with -ρ Water and its preparation method gV Matching with
Deducing: v (V) Matching with ＝[(ρ Water and its preparation method -ρ Feel of the sense )/(ρ Matching with -ρ Water and its preparation method )]Sh
When the density rho of the underground water Water and its preparation method The cross-sectional area S of the induction tube 11 and the density ρ of the induction tube 11 Feel of the sense And the density ρ of the weight 12 Matching with Under certain conditions, according to the total length h of the induction tube 11, the minimum volume of the counterweight body 12 required when the induction tube 11 is completely submerged is obtained; when the density rho of the underground water Water and its preparation method In the case of a change, the possible maximum value of the groundwater density can be substituted into the above equation, and the minimum volume required for the weight 12 when the induction pipe 11 is completely submerged can be obtained. As a specific structure of the reference body 18, the reference body 18 is in a sphere structure, so that sediment at the bottom of water is prevented from adhering to the top of the reference body 18 as much as possible, and the sediment precipitation on the reference body 18 can be prevented from affecting the weight of the reference body 18 to affect the density measurement accuracy.
The underground water density measuring module comprises a second resistor rod 13 vertically fixed on the mounting platform 2, one side of the second resistor rod 13 is provided with a second cylindrical spring 14, the axis of the second cylindrical spring 14 is parallel to the axis of the second resistor rod 13, the bottom of the second cylindrical spring 14 is fixed with the mounting platform 2, the top of the second cylindrical spring 14 is fixedly connected with a second insulating hard plate 15, the upper surface of the second insulating hard plate 15 is provided with a second conductive piece 16 which is in sliding connection with the outer wall of the second resistor rod 13, the second resistor rod 13 and the second conductive piece 16 are connected with the power module 3 in series through wires, and a second ammeter 17 which is electrically connected with the monitoring and analyzing module 4 is connected in series on the circuit of the underground water density measuring module; a reference body 18 is arranged below the second insulating hard plate 15, the reference body 18 passes through the middle part of the second cylindrical spring 14 through a steel wire rope to be connected with the lower surface of the second insulating hard plate 15, and the reference body 18 is arranged below the annual lowest water level line of the monitored point; the second conductive member 16 is made of a material with extremely low resistance, and the resistance value is negligible and can be regarded as a wire; the diameter of the steel wire rope is smaller, and the buoyancy of the steel wire rope is negligible after the steel wire rope is submerged by water.
The first resistor rod 6 and the second resistor rod 13 are made of the same material, and are made of materials with resistivity which does not change greatly with the ambient temperature, and the resistivity can be regarded as a constant value; the first resistive rod 6 is connected in parallel with the second resistive rod 13.
The working process of the water level measuring module is as follows: when the liquid level of the underground water level is changed, the buoyancy force borne by the induction pipe 11 is correspondingly changed, the stress of the first cylindrical spring 7 is changed along with the change to stretch and contract the length, and then the resistance value of the first resistor rod 6 connected with the circuit is changed, and the current measured by the first ammeter 10 is changed. If the liquid level of the ground water level rises, the buoyancy force borne by the induction tube 11 is increased, the downward tension force borne by the first insulating hard plate 8 is reduced, the stress of the first cylindrical spring 7 is reduced and stretched accordingly, the first insulating hard plate 8 drives the first conductive piece 9 to rise under the upward thrust action of the first cylindrical spring 7, the resistance value of the first resistor rod 6 connected to the circuit is increased, and the monitoring analysis module 4 calculates the current ground water level height in real time according to the current change in the circuit measured by the first ammeter 10.
The specific calculation process is as follows: when the water level monitoring device is installed, the initial elevation of the underground water level is H 0 The initial length of the first resistor rod 6 connected into the circuit is L, and the initial elevation of the top surface of the counterweight body 12 is h 0 The first ammeter 10 measures a current I; when the water level changes to H, the length of the first resistor rod 6 connected to the circuit changes to L ', and the current measured by the first ammeter 10 is I'The method comprises the steps of carrying out a first treatment on the surface of the The resistivity of the first resistor rod 6 is ρ, the cross-sectional area is S, the voltage of a power supply is U, the gravity of the three parts of the steel wire rope, the induction tube 11 and the counterweight body 12 is G, the stiffness coefficient of the first cylindrical spring 7 is k, the density of groundwater is a, the gravity acceleration is G, the volume of the counterweight body 12 is V, the cross-sectional area of the induction tube 11 is S', and the length of the first resistor rod 6 connected into a circuit is L when the steel wire rope, the induction tube 8 and the counterweight body 9 are not hung below the first insulating hard plate 8 0 Then:
U/I＝(ρL)/S 1)
U/I＇＝(ρL＇)/S 2)
G-agV-agS＇(H 0 -h 0 )＝k(L 0 -L) 3)
G-agV-agS＇{H-[h 0 +(L＇-L)]}＝k(L 0 -L＇) 4)
from equation 1) it follows:
L＝US/(ρI)5)
from equation 2) it follows:
L＇＝US/(ρI＇)6)
from equations 3) and 4):
H＝H 0 +L＇-L+k(L＇-L)/(agS＇)＝H 0 +[1+k/(agS＇)]·(L＇-L)7)
substituting equation 5) and equation 6) into equation 7) yields:
H＝H 0 +[1+k/(agS＇)]·[US/(ρI＇)-US/(ρI)]8)
in equation 8), the initial elevation H of the groundwater level 0 The resistivity ρ, the cross-sectional area S 'of the first resistor rod 6, the voltage U of the induction tube 11, the stiffness coefficient k of the first cylindrical spring 7 and the gravitational acceleration g are all known, and the groundwater density a is brought into the formula 8) by the currents I and I' measured by the first ammeter, so that the groundwater level height H at any moment can be obtained.
The working process of the underground water density measuring module is as follows: because the density of the underground water is not always unchanged, the density of the underground water in different areas is different, the water body is turbid due to heavy rainfall, the density of the underground water can be changed, and in addition, when the mineralization degree of the water body is changed, the density of the underground water body can be changed, namely, in the actual underground water level monitoring process, the density of the underground water body is changed frequently; when the density of the underground water changes, the buoyancy of the reference body 18 changes along with the change, the downward pulling force of the second insulating hard board 15 changes due to the change of the buoyancy of the reference body 18, the stress of the second cylindrical spring 14 changes along with the change, so that the length expansion is generated, the position of the second conductive piece 16 rises or falls along with the rise, the resistance value of the second resistor rod 13 connected to the circuit is influenced, the current in the circuit is changed, the monitoring and analyzing module 4 obtains the current density of the underground water according to the change of the reading of the second ammeter 17, and the problem that the measuring result is inaccurate due to the fact that the water level meter ignores the change of the density in the prior art is solved. The specific algorithm is as follows:
when the initial elevation of the underground water level is H 0 When the initial density of the ground water is set as a, the initial length of the second resistor rod 13 connected into the circuit is set as L 2 The initial current measured by the second ammeter 17 is I 2 The method comprises the steps of carrying out a first treatment on the surface of the When the water level changes to H, the water level of the underground becomes a', and the length of the second resistor rod 13 connected to the circuit becomes L 2 The current measured by the second ammeter 17 is I 2 'S'; the voltage of the power module 3 is U, the resistivity of the second resistor rod 13 is ρ, and the cross-sectional area is S 2 The volume of the reference body 18 is V 1 Then:
U/I 2 ＝ρL 2 /S 2 9)
U/I 2 ＇＝(ρ·L 2 ＇)/S 2 10)
k(L 2 ＇-L 2 )＝(a＇-a)gV 1 11)
from equation 9), equation 10), and equation 11):
a＇＝k[US 2 /(ρ·I 2 ＇)-US 2 /(ρ·I 2 )]/(gV 1 )+a 12)
in equation 12), the initial density a of groundwater, the power voltage U, the resistivity ρ of the second resistive rod 13, the cross-sectional area S 2 Reference volume 18V 1 The stiffness coefficient k of the second cylindrical spring 14 is known for the gravitational acceleration g, the current I measured by the second ammeter 17 2 And I 2 "groundwater density a" at any time can be calculated from equation 12).
Substituting the groundwater density at any moment into the formula 8) to obtain the groundwater level elevation at the corresponding moment under the circumstance of groundwater density change.
Specifically, as a specific structure of the first conductive element 9 and the second conductive element 16, the first conductive element 9 and the second conductive element 16 each comprise a flat sheet metal sheet 19 and a metal annular sleeve 20, the side wall of the metal annular sleeve 20 is fixedly connected with one end of the flat sheet metal sheet 19, the metal annular sleeve 20 is sleeved on the outer wall of the first resistor rod 6 or the second resistor rod 13, and the inner wall of the metal annular sleeve 20 is in sliding contact with the outer wall of the first resistor rod 6 or the second resistor rod 13; the lower surface of the flat sheet metal piece 19 is fixedly connected with the upper surface of the first insulating hard sheet 8 or the second insulating hard sheet 15.
The circuit in the resistance type water level monitoring device in the scheme adopts direct current, specifically, the power module 3 is a direct current power supply, the communication module 5 is a wireless communication module, and the first ammeter 10 and the second ammeter 17 are digital display direct current ammeter.
The density of the weight body 12 is greater than that of groundwater, the top of the weight body 12 is in a conical structure with an upward small end or a hemispherical structure with an upward round end, so that the weight of the weight body 12 is prevented from being influenced by sediment precipitation at the upper part of the weight body 12, measurement errors are caused, and the measurement accuracy of the whole device is further improved.
In summary, according to the resistive water level monitoring device with the underground water density measurement function, the current underground water level elevation can be calculated in real time through the change of the reading of the first ammeter 10, and the calculated result is transmitted remotely through the communication module 5; according to the underground water density measuring module in the scheme, the underground water density at any moment can be calculated through the reading change of the second ammeter 17 and the initial density of the underground water, and according to the underground water density at any moment, the underground water level elevation after the underground water density change can be obtained more accurately. Meanwhile, the measurement of the underground water density has important reference significance for comprehensively judging the water quality condition of the underground water, and the change of the landslide slope body structure and the landslide deformation condition.
Claims (8)
1. The resistive water level monitoring device with the underground water density measurement function is characterized by comprising a mounting frame (1) arranged on the ground surface, wherein a mounting platform (2) is arranged on the mounting frame (1), and a power supply module (3), a monitoring analysis module (4), a communication module (5), a water level measurement module and an underground water density measurement module are arranged on the mounting platform (2);
the water level measurement module comprises a first resistor rod (6) vertically fixed on a mounting platform (2), a first cylindrical spring (7) is arranged on one side of the first resistor rod (6), the axis of the first cylindrical spring (7) is parallel to the axis of the first resistor rod (6), the bottom of the first cylindrical spring (7) is fixed with the mounting platform (2), the top of the first cylindrical spring (7) is fixedly connected with a first insulating hard plate (8), a first conducting piece (9) which is in sliding connection with the outer wall of the first resistor rod (6) is arranged on the upper surface of the first insulating hard plate (8), the first resistor rod (6) and the first conducting piece (9) are connected in series with the power module (3) through wires, and a first ammeter (10) which is electrically connected with the monitoring analysis module (4) is connected in series on the circuit of the water level measurement module. An induction pipe (11) with a whole sealing structure is arranged below the first insulating hard plate (8), and the top of the induction pipe (11) passes through the middle part of the first cylindrical spring (7) through a steel wire rope to be connected with the lower surface of the first insulating hard plate (8);
the underground water density measurement module comprises a second resistor rod (13) vertically fixed on the mounting platform (2), one side of the second resistor rod (13) is provided with a second cylindrical spring (14), the axis of the second cylindrical spring (14) is parallel to the axis of the second resistor rod (13), the bottom of the second cylindrical spring (14) is fixed with the mounting platform (2), the top of the second cylindrical spring (14) is fixedly connected with a second insulating hard plate (15), the upper surface of the second insulating hard plate (15) is provided with a second conductive piece (16) which is in sliding connection with the outer wall of the second resistor rod (13), the second resistor rod (13) and the second conductive piece (16) are connected in series with the power module (3) through wires, and a second ammeter (17) which is electrically connected with the monitoring analysis module (4) is connected in series on the circuit of the underground water density measurement module; a reference body (18) is arranged below the second insulating hard plate (15), the reference body (18) passes through the middle part of the second cylindrical spring (14) through a steel wire rope to be connected with the lower surface of the second insulating hard plate (15), and the reference body (18) is arranged below the annual lowest water level line of the monitored point;
the first resistor rod (6) and the second resistor rod (13) are made of the same material, and the first resistor rod (6) is connected with the second resistor rod (13) in parallel.
2. The resistive water level monitoring device with the underground water density measurement function according to claim 1, wherein the first conductive piece (9) and the second conductive piece (16) comprise flat sheet metal sheets (19) and a metal annular sleeve (20), the side wall of the metal annular sleeve (20) is fixedly connected with one end of each flat sheet metal sheet (19), the metal annular sleeve (20) is sleeved on the outer wall of the first resistor rod (6) or the second resistor rod (13), and the inner wall of the metal annular sleeve (20) is in sliding contact with the outer wall of the first resistor rod (6) or the second resistor rod (13); the lower surface of the flat sheet metal piece (19) is fixedly connected with the upper surface of the first insulating hard plate (8) or the second insulating hard plate (15).
3. The resistive water level monitoring device with the underground water density measurement function according to claim 1, wherein the power supply module (3) is a direct current power supply, the communication module (5) is a wireless communication module, and the first ammeter (10) and the second ammeter (17) are digital display direct current ammeter.
4. The resistive water level monitoring device with the underground water density measuring function according to claim 1, wherein when the density of the induction pipe (11) is higher than that of the underground water, a counterweight body (12) is not needed at the bottom of the induction pipe, and when the density of the induction pipe (11) is lower than that of the underground water, the counterweight body (12) is fixedly arranged at the bottom of the induction pipe.
5. The resistive water level monitoring device with the underground water density measuring function according to claim 4, wherein the density of the counterweight body (12) is larger than that of the underground water, and the top of the counterweight body (12) is in a conical structure with a small end upwards or a hemispherical structure with a round end upwards.
6. The resistive water level monitoring device with the underground water density measuring function according to claim 4, wherein the density of the sensing tube (11) is smaller than that of underground water, the sensing tube (11) comprises a plurality of sections of tube bodies (1101) which are hollow sealing structures, a threaded groove (1102) is formed in the top of each section of tube body (1101), a threaded end (1103) is arranged in a protruding mode at the bottom of each section of tube body, the distance between the upper surface of the tube body (1101) and the end face of the threaded end (1103) is 0.5-4 m, and two adjacent sections of tube bodies (1101) are connected in a matched mode through the threaded groove (1102) and the threaded end (1103); the bottom of the tube body (1101) positioned at the bottom end of the induction tube (11) is connected with the top surface of the counterweight body (12) by a threaded end (1103).
7. A resistive water level monitoring device with groundwater level measuring function according to any of claims 1-6, characterized in that the reference body (18) is of a sphere structure.
8. The resistive water level monitoring device with the underground water density measurement function according to claim 6, wherein the threaded groove (1102) and the threaded end (1103) are spliced in a sealing manner, and after the induction pipe (11) is spliced in a multi-section manner, the diameter of the pipe body of the induction pipe (11) is consistent with the diameter of the pipe body (1101).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321371801.XU CN220039580U (en) | 2023-05-31 | 2023-05-31 | Resistance type water level monitoring device with underground water density measurement function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321371801.XU CN220039580U (en) | 2023-05-31 | 2023-05-31 | Resistance type water level monitoring device with underground water density measurement function |
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