CN212540357U - Water quality sensor for on-line detection of multiple inorganic parameters of underground water - Google Patents
Water quality sensor for on-line detection of multiple inorganic parameters of underground water Download PDFInfo
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- CN212540357U CN212540357U CN202021133502.9U CN202021133502U CN212540357U CN 212540357 U CN212540357 U CN 212540357U CN 202021133502 U CN202021133502 U CN 202021133502U CN 212540357 U CN212540357 U CN 212540357U
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Abstract
The utility model discloses a water quality sensor for online detection of multiple inorganic parameters of underground water, which comprises a sensor cylinder, a sensor core body is clamped in the sensor cylinder, the bottom opening of the sensor cylinder is sealed by a head plug, a T-shaped water inlet channel is arranged on the head plug, a circuit board cylinder is arranged at the top opening of the sensor cylinder, a circuit board is arranged in the circuit board cylinder, a male connector is arranged at the top opening of the circuit board cylinder, the top of the male connector is connected with a female connector by a male connector fixing nut, a four-pin plug fixing sleeve for fixing a four-pin plug is arranged on the male connector and the female connector in a penetrating way, a tail pressing cap is arranged at the top opening of the female connector, a lead drawn out from the sensor core body is, and the lead wire led out from the signal output port of the circuit board passes through the circuit board barrel and then sequentially passes through the lead wire channels arranged on the male connector, the female connector and the tail pressing cap through the four-pin plug and then is connected with the detection cable. The utility model discloses can accurately acquire the multiple inorganic parameter in the groundwater in real time, it is high to detect the accuracy, is suitable for the popularization.
Description
Technical Field
The utility model relates to a water quality sensor for many inorganic parameter on-line measuring of groundwater belongs to the inorganic parameter detection technical field of groundwater.
Background
The quality of underground water is affected by various inorganic parameters in the underground water, and how to accurately acquire the various inorganic parameters of the underground water is the key for researching the water quality condition of the underground water, and the inorganic parameters generally used for judging the quality of the underground water relate to temperature, pressure, actual conductivity, water level, exact conductivity, salinity, total dissolved solids, resistivity and water density. However, the existing sampling tool for detecting inorganic parameters of underground water at home and abroad is usually a portable sampling device, and the inorganic parameters detected by the sampling device are single in type, inaccurate in data, insufficient in reliability and low in utilization rate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a many inorganic parameters of groundwater on-line measuring uses water quality sensor, its multiple inorganic parameter that can accurate acquire in the groundwater water layer in real time, and it is high to detect the accuracy, is suitable for the popularization.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a many inorganic parameters of groundwater on-line measuring uses water quality sensor which characterized in that: the sensor comprises a sensor cylinder, a sensor core body is clamped in the sensor cylinder, a bottom opening of the sensor cylinder is sealed through a head plug, a T-shaped water inlet channel is arranged on the head plug, a circuit board cylinder is installed at a top opening of the sensor cylinder, a circuit board is installed in the circuit board cylinder, a male connector is installed at the top opening of the circuit board cylinder, the top of the male connector is connected with a female connector through a male connector and a female connector fixing nut, a four-pin plug fixing sleeve for fixing a four-pin plug is arranged on the male connector and the female connector in a penetrating mode, a tail pressing cap is installed on the top opening of the female connector, a lead led out from the sensor core body is connected with a signal input port of a circuit board, and the lead led out from a signal output port of the circuit board sequentially penetrates through the male connector via the four-pin plug after penetrating through the.
The utility model has the advantages that:
the utility model discloses water quality sensor adopts succinct practical bridge circuit to come the voltage signal of sensing representative pressure parameter, and whole sensor is high temperature and high pressure resistant, can accurately acquire multiple inorganic parameter (like pressure, temperature, actual conductivity parameter) in the groundwater water layer in real time to can calculate water level, exact conductivity, salinity, total dissolved solids, resistivity and water density parameter then, sealing performance is good, long service life, but wide application in projects such as hydrogeology investigation, regional water pollution quality investigation, contaminated site restoration.
Drawings
Fig. 1 is a schematic structural diagram of the water quality sensor of the present invention.
Fig. 2 is a schematic structural view of a sensor core.
Fig. 3 is an equivalent circuit schematic diagram of the acquisition of the voltage signal.
Fig. 4 is a schematic diagram of the centrosymmetric distribution of four piezoresistors.
Detailed Description
Referring to fig. 1 and 2, the water quality sensor 60 of the present invention includes a sensor cylinder 62, a sensor core 63 is clamped in an inner cavity of the sensor cylinder 62, a bottom opening of the sensor cylinder 62 is sealed by a head plug 61, i.e. the head plug 61 is screwed on the bottom opening of the sensor cylinder 62, a T-shaped water inlet channel is arranged on the head plug 61, a circuit board cylinder 64 is arranged on a top opening of the sensor cylinder 62, i.e. the top opening of the sensor cylinder 62 is screwed on the bottom opening of the circuit board cylinder 64, a circuit board 65 is arranged in the inner cavity of the circuit board cylinder 64, a male connector 66 is arranged on the top opening of the circuit board cylinder 64, i.e. the top opening of the circuit board cylinder 64 is screwed on the bottom opening of the male connector 66, the top of the male connector 66 is connected with a female connector 68 through a male connector fixing nut 67, a four-pin plug fixing sleeve 660 for fixing a four-pin plug is arranged on the male connector 66 and the female connector 68, i., a tail pressing cap 69 is mounted on the top opening of the female joint 68, namely, the top opening of the female joint 68 is in threaded connection with the bottom opening of the tail pressing cap 69, a lead led out from the sensor core 63 is connected with a signal input port of the circuit board 65, a lead led out from a signal output port of the circuit board 65 passes through the circuit board barrel 64 and then sequentially passes through lead channels arranged on the male joint 66, the female joint 68 and the tail pressing cap 69 via a four-pin plug 661 to be connected with a detection cable, and the detection cable is used for being connected with related control equipment.
In practical application, when the water quality sensor 60 is not used, the top of the tail pressing cap 69 is buckled with a cap 690, as shown in fig. 1, the cap 690 is provided with a clamping groove for being buckled on the male connector 66.
As shown in fig. 1, the water quality sensor 60 of the present invention is vertically placed in practical use, with the head plug 61 at the left at the bottom and the tail pressure cap 69 at the right at the top.
As shown in fig. 2, the sensor core 63 includes a main casing 630, an oil-filled cavity 631 is disposed at the top of the main casing 630, the oil-filled cavity 631 is of a large-sized structure, the oil-filled cavity 631 extends downward to communicate with an upper groove 6301 formed at the bottom of the main casing 630, a silicon diaphragm 635 of a laser-etched pressure measurement circuit is disposed at the bottom of the upper groove 6301, the pressure measurement circuit is a bridge circuit formed by overlapping four piezoresistors laser-etched on the surface of the silicon diaphragm 635, a temperature measurement element 637 is disposed on the surface of the silicon diaphragm 635 facing the oil-filled cavity 631, the oil-filled cavity 631 is sealed by a sealing cap 638, a corrugated sheet 634 (existing component) is fixed at the bottom of the main casing 630 by an annular pressure ring 633, a gap is maintained between the corrugated sheet 634 and the silicon diaphragm 635 and is filled with silicon oil, a conductivity sensor 639 is installed in the pressure ring 633, the conductivity sensor 639 is located below the corrugated sheet 634 without contacting the corrugated sheet 634 and without covering the corrugated sheet, the lead wire led out from the pressure measuring circuit and the temperature measuring element 637 passes through the silicone oil 632 in the oil filling cavity 631 and the sealing cover 638 and then is connected with the output pin interface 6380 installed outside the sealing cover 638, the lead wire led out from the conductivity sensor 639 passes through the pressure ring 633 and a through hole (not shown in the figure) formed in the main shell 630 and then is connected with the output pin interface 6380, the lead wire led out from the conductivity sensor 639 does not pass through the silicone oil 632 in the oil filling cavity 631, and the output pin interface 6380 is connected with the signal input port of the circuit board 65.
Referring to fig. 1, the water inlet channel of the head plug 61 has two water inlets 613 and one water outlet 614, the water inlet 613 is exposed, the water outlet 614 is communicated with the inner cavity of the sensor cylinder 62, the conductivity sensor 639 of the sensor core 63 faces the water outlet 614, the liquid flowing out of the water outlet 614 generates uniform pressure action on the sensor core 63 to ensure the measurement accuracy of the voltage signal, and the bottom of the head plug 61 is provided with a conical head 611 which is convenient for reducing resistance when the water quality sensor 60 is put into a liquid environment.
As shown in fig. 1, a supporting and fixing wall 622 extends upward from the top of the sensor cylinder 62, and the supporting and fixing wall 622 may be in a shape of a cylinder, a semi-cylinder, a plate, and the like, without limitation, wherein: the supporting and fixing wall 622 extends into the inner cavity of the circuit board barrel 64 to firmly fix the circuit board 65; the supporting and fixing wall 622 is provided with a lead passage 621 for routing lead-out wires of the circuit board 65. The wire paths on the top of the circuit board barrel 64, the male connector 66, the female connector 68, and the tail cap 69 are understood by reference to the wire path 621 on the supporting fixed wall 622.
In practical design, an O-shaped waterproof ring (not shown in the figure) for ensuring sealing performance and realizing water resistance in a cavity can be installed between the connecting parts of the sensor cylinder 62 and the circuit board cylinder 64, between the connecting parts of the circuit board cylinder 64 and the male joint 66, between the connecting parts of the male joint 66 and the male-female joint fixing nut 660, and the like, and the O-shaped waterproof ring is preferably an O-shaped rubber sealing ring with high temperature and high pressure resistance.
In practical design, the temperature measuring element 637 is preferably a platinum resistor.
In a practical design, the silicon diaphragm 635 is made of single crystal silicon, and four piezoresistors laser-etched on the surface of the silicon diaphragm 635 are connected to form a bridge circuit as shown in fig. 3, wherein: the four piezoresistors have equal resistance values, and are distributed in a central symmetry manner, as shown in fig. 4.
The utility model discloses in, can design pressure measurement circuit or bridge circuit for outwards drawing three wires, a wire output voltage signal, two other wires are used for connecting the positive negative pole of power, design temperature element 637 for outwards drawing forth a wire that is used for exporting temperature signal. The conductivity sensor 639 is designed to draw out one wire for outputting an actual conductivity signal. These wires connect to output pins on output pin interface 6380.
The pressure measurement principle adopted by the sensor core 63 is as follows:
as shown in fig. 3 and 4, piezoresistors R1 to R4 for sensing voltage signals and having equal resistance are laser-etched on the surface of the silicon diaphragm 635 by using the piezoresistive effect of the silicon diaphragm 635, and the piezoresistors R1 to R4 are symmetrically distributed as bridge arm resistors and are connected in a bridge circuit.
When the silicon diaphragm 635 is under pressure, its shape and resistivity change, which results in a change in resistance of the silicon diaphragm 635 itself, that is, there is a mapping relationship between the pressure (strain) and the resistance, which can be expressed as follows:
in the above formula: pi is the piezoresistive coefficient of the material of the silicon diaphragm 635, E is the young modulus of the material of the silicon diaphragm 635, epsilon is the strain rate of the material of the silicon diaphragm 635, and upsilon is the poisson ratio of the material of the silicon diaphragm 635.
It can be seen that the resistance value of the semiconductor such as the silicon diaphragm 635 varies
Is formed by the combined action of the change of geometric dimension and the change of the motion state of the carrier.
In practical application, when the utility model discloses water quality sensor 60 soaks in the detection liquid time, liquid medium gets into through the inhalant canal that the head blockked up 61, directly applys pressure P to corrugated sheet 634 behind conductivity sensor 639, then corrugated sheet 634 transmits the pressure P of response for silicon diaphragm 635 via silicon oil 636.
When the resistance of the piezo-resistor on the silicon diaphragm 635 changes due to the pressure P, the balance state of the bridge circuit is damaged, so that the bridge circuit outputs a non-zero voltage signal Vout, which reflects the pressure, thereby achieving the purpose of measuring the inorganic parameters of the pressure.
Further, ideally, the resistances of the voltage dependent resistors R1-R4 in the bridge circuit are identical, and they are affected by external factors such as temperature, but when the external pressure P acts on the silicon diaphragm 635, the voltage response of the bridge circuit changes linearly.
As shown in fig. 3 and 4, setting the voltage signal Vout output by the bridge circuit to be a potential difference between two points B, D, and A, C two points are used for inputting the power supply voltage, the following formula is obtained:
Vout＝VB-VD
in the formula:
vin is an input power supply voltage, Δ R represents a resistance value change of the piezoresistor, and R1 ', R2', R3 'and R4' are resistance values of the piezoresistors R1 to R4 after the resistance value change.
Under an ideal state, assuming that the bridge arm resistances, i.e., the piezoresistors, are collectively denoted as R, and the pressure applied to the silicon diaphragm 635 is P, the voltage change Δ Vout output by the bridge circuit is:
it can be seen from the above formula that, under the action of pressure P, the voltage signal change Δ Vout output by the water quality sensor 60 of the present invention is determined by the resistance change Δ R of the bridge arm resistor R in the bridge circuit. Therefore, it can be concluded that the voltage signal Vout output by the bridge circuit can well reflect the pressure parameter.
As shown in fig. 1, the conductivity sensor 639 includes an insulating base 6391, four conductivity electrodes 6392 are disposed on the insulating base 6391, and the conductivity sensor 639 is clamped in the pressure ring 633 by the insulating base 6391.
In the present invention, two inorganic parameters of temperature and conductivity are directly obtained through the temperature sensor 637 and the conductivity sensor 639, respectively, which are well known in the art and not described in detail herein.
The utility model discloses in, the design has processing circuit on the circuit board 65, and processing circuit's main function calculates the pressure parameter for receiving temperature, voltage, actual conductivity data based on the voltage signal who receives, calculates exact conductivity, salinity, total dissolved solids, resistivity and water density parameter based on temperature, pressure, actual conductivity etc. and outwards transmits these parameters via the detection cable, and in addition, circuit board 65 still can be responsible for supplying power (low-voltage) to sensor core 63. The wiring board 65 and the processing circuitry thereon are well known in the art and will not be described in detail herein.
The utility model discloses water quality sensor 60 is used for real-time detection temperature, pressure and actual conductivity to based on the detection data calculation give water level, exact conductivity (the conductivity when 25 degrees centigrade), salinity, total dissolved solid, resistivity and water density, that is to say, the utility model discloses water quality sensor 60 can gather the above-mentioned nine inorganic parameters of groundwater to be used for judging the quality of water.
When using, will through surveying the cable the utility model discloses water quality sensor 60 transfers in the liquid environment of down-hole check point or put in the good water sample of collection in the water sample circulation pond in the pit. Starting the utility model discloses water quality sensor 60, water quality sensor 60's sampling frequency can be set for according to the actual demand.
Therefore, the utility model discloses water quality sensor 60 detects temperature, pressure and actual conductivity according to the sampling frequency interval that sets for to calculate other inorganic parameters, such as water level, exact conductivity, salinity, total dissolved solids, resistivity and water density based on the temperature, pressure and the actual conductivity that detect. Finally, the utility model discloses water quality sensor 60 stores all inorganic parameter data of all acquirements and feeds back to the aboveground through the detection cable.
The utility model has the advantages that:
the utility model discloses water quality sensor adopts succinct practical bridge circuit to come the voltage signal of sensing representative pressure parameter, and whole sensor is high temperature and high pressure resistant, can accurately acquire multiple inorganic parameter (like pressure, temperature, actual conductivity parameter) in the groundwater water layer in real time to can calculate water level, exact conductivity, salinity, total dissolved solids, resistivity and water density parameter then, sealing performance is good, long service life, but wide application in projects such as hydrogeology investigation, regional water pollution quality investigation, contaminated site restoration.
The above description is the preferred embodiment of the present invention and the technical principle applied by the preferred embodiment, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes based on the equivalent transformation, simple replacement, etc. of the technical solution of the present invention all belong to the protection scope of the present invention.
Claims (9)
1. The utility model provides a many inorganic parameters of groundwater on-line measuring uses water quality sensor which characterized in that: it includes a sensor section of thick bamboo, the sensor section of thick bamboo inside callipers is equipped with the sensor core, the end opening of a sensor section of thick bamboo is sealed through the head jam, be equipped with T style of calligraphy inhalant canal on the head jam, a circuit board section of thick bamboo is installed to the top mouth of a sensor section of thick bamboo, the public connector is installed to the top mouth of a circuit board section of thick bamboo, public female joint fixation nut connection has the female joint through public female joint, wear to be equipped with the four-pin plug fixed cover that is used for fixed four-pin plug on public connector and the female joint, install the afterbody on the top mouth of female joint and press the cap, the wire of drawing forth from the sensor core is connected with the signal input port of circuit board, the wire of drawing forth from the signal output port of circuit board passes the circuit board section of thick bamboo after passing the public connector in proper order through four: the sensor core comprises a main shell, an oil filling cavity is arranged at the top of the main shell, the oil filling cavity extends downwards to be communicated with an upper groove formed in the bottom of the main shell, a silicon diaphragm of a pressure measuring circuit is arranged at the bottom of the upper groove, the pressure measuring circuit is a bridge circuit formed by overlapping four piezoresistors, a temperature measuring element is arranged on the surface of the silicon diaphragm facing the oil filling cavity, the oil filling cavity is sealed by a sealing cover after being filled with silicon oil, a corrugated sheet is fixed at the bottom of the main shell through an annular pressure ring, a gap is kept between the corrugated sheet and the silicon diaphragm and is filled with silicon oil, a conductivity sensor is arranged in the pressure ring and is positioned below the corrugated sheet and does not cover and shield the corrugated sheet, a lead led out from the pressure measuring circuit and the temperature measuring element penetrates through the silicon oil in the oil filling cavity and the sealing cover and is connected with an output pin interface arranged outside the sealing cover, and a lead led out from the conductivity sensor penetrates through, the output pin interface is connected with the signal input port of the circuit board.
2. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
and the top of the tail pressing cap is provided with a cover cap when the water quality sensor for online detection of multiple inorganic parameters of underground water is not used.
3. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
the top of sensor section of thick bamboo upwards extends there is the fixed wall of support, wherein: the supporting and fixing wall extends into the inner cavity of the circuit board barrel to firmly fix the circuit board; and the supporting and fixing wall is provided with a lead channel for distributing the lead-out leads of the circuit board.
4. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
the water inlet channel on the head plug is provided with two water inlets and a water outlet, the water inlets are exposed, the water outlet is communicated with the inner cavity of the sensor cylinder, and the conductivity sensor of the sensor core body faces the water outlet.
5. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 4, wherein:
the bottom of the head plug is provided with a conical head.
6. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
the temperature measuring element is a platinum resistor.
7. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
the silicon diaphragm is made of monocrystalline silicon.
8. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
the resistance values of the four piezoresistors which are formed by laser etching on the surface of the silicon diaphragm are equal, and the four piezoresistors are distributed in a centrosymmetric manner.
9. The water quality sensor for on-line detection of multiple inorganic parameters of underground water according to claim 1, wherein:
the conductivity sensor comprises an insulating seat, four conductivity electrodes are arranged on the insulating seat, and the conductivity sensor is clamped in the pressing ring in an insulating mode through the insulating seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021133502.9U CN212540357U (en) | 2020-06-18 | 2020-06-18 | Water quality sensor for on-line detection of multiple inorganic parameters of underground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021133502.9U CN212540357U (en) | 2020-06-18 | 2020-06-18 | Water quality sensor for on-line detection of multiple inorganic parameters of underground water |
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| Publication Number | Publication Date |
|---|---|
| CN212540357U true CN212540357U (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021133502.9U Active CN212540357U (en) | 2020-06-18 | 2020-06-18 | Water quality sensor for on-line detection of multiple inorganic parameters of underground water |
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| Country | Link |
|---|---|
| CN (1) | CN212540357U (en) |
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2020
- 2020-06-18 CN CN202021133502.9U patent/CN212540357U/en active Active
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