CN105698898A - Deep well water level sensor based on TDR principle and water level measuring method thereof - Google Patents
Deep well water level sensor based on TDR principle and water level measuring method thereof Download PDFInfo
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- CN105698898A CN105698898A CN201610165433.1A CN201610165433A CN105698898A CN 105698898 A CN105698898 A CN 105698898A CN 201610165433 A CN201610165433 A CN 201610165433A CN 105698898 A CN105698898 A CN 105698898A
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- tdr
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- water level
- heart yearns
- deep well
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Abstract
The invention discloses a deep well water level sensor based on the TDR principle and a water level measuring method thereof.According to the method, a two-core wire is arranged from a water pump to the ground in the axial direction of a pump head pipe, the whole two-core wire is sleeved with an anti-interference sheath, a TDR measuring instrument is connected with the upper end of the two-core wire, the lower end of the two-core wire stretches out of the lower end of the anti-interference sheath, the TDR measuring instrument is vertically installed in a deep well, the lower endpoint of the two-core wire and a TDR data point which is in front of the lower endpoint and smaller than a frequency conversion interference threshold value and has a minimum value are found out, TDR data between the lower endpoint of the two-core wire and the TDR data point is multiplied by the unit length, obtained through calibration, of the two-core wire at intervals, the total length of the two-core wire is subtracted by the length in water, and then the distance from the water surface to a well mouth is obtained.The deep well water level sensor is high in frequency converter interference resistance, high-precision dynamic water level measurement can be realized, maintenance and replacement are both convenient, and the deep well water level sensor is particularly suitable for the deep well where the variable frequency water pump works.
Description
Technical field
The invention belongs to detection technique field, be specifically related to water level of deep well sensor and the water level measurement method thereof of a kind of TDR principle, the level measuring under the deep-well that can be used for。
Background technology
During current water level is measured, floating-ball type water level sensor measures the presence or absence of water only by switching value, although stagewise ball float water level sensor can measure the water level of multiple degree of depth, but every grade of float switch is required for two lead-out wires, and progression is more many, goes between more many；Although existing ultrasound wave is water level transmitter, precision easy to use is higher, but is having variable frequency pump to work, and gather cable, and has in the deep-well of reducing, cannot use at all, and the cable that transmitting signal can be wound around by lift pipe blocks。
Although throw-in type pressure transmitter can be used in the deep-well having variable frequency pump to work in high precision carries out level measuring, but the intensification along with water level, the pressure sensitive portion encapsulation of pressure transmitter requires significantly high, in deep water more than 500 meters, sensing element is very easily crushed and intakes, and throw-in type pressure transmitter is once damage, maintenance needs to mention together with water pump lift pipe, fix to install again and go back, but the water pump of more than 500 meters lift pipes is mentioned the cost of labor done installation again again and is far longer than a throw-in type liquid transmitter。
The level sensor of existing TDR principle and the level sensor of capacitance principle, the empty well not having variable frequency pump to work can be used to level measuring, but when there being variable frequency pump to work, the transmission line of TDR or the pole plate of capacitance sensor need installation parallel with the cable of variable frequency pump, when well depth has hundreds of rice, parallel part also has hundreds of rice, when converter works, the frequency conversion interference that water pump cable radiates, it is far longer than useful signal, causes the transmission line of TDR or the capacitance sensor at all cannot normal operation。
Summary of the invention
In order to solve Problems existing in background technology, the present invention proposes water level of deep well sensor and the water level measurement method thereof of a kind of TDR principle, overcomes in prior art in the water pump problem that interference measured by TDR measuring instrument under having converter service condition。Sensor of the invention is enclosed within the anti-interference sheath being made up of stainless steel flexible hose and joint for the TDR transmission line measured, the stainless steel tube of well head connects the zero line of pump variable frequency device, the method substantially increases signal to noise ratio, can overcome the interference of variable frequency pump, it is achieved deep-well dynamic water table is measured。
The technical solution used in the present invention is:
One, the water level of deep well sensor of a kind of TDR principle:
Water pump is placed in underwater, water pump is connected with the pump variable frequency device on ground through water pump cable, water pump is through pump head bank of tubes water, it is characterized in that: described level sensor includes TDR measuring instrument, two heart yearns and anti-interference sheath, anti-interference sheath is bundled on pump head pipe by band, two heart yearns are axial arranged along pump head pipe from water pump to ground, whole two heart yearns are enclosed within the anti-interference sheath being mainly made up of stainless steel flexible hose and joint, TDR measuring instrument is placed in ground, the upper end of TDR measuring instrument and two heart yearns connects, two heart yearn lower ends reach outside anti-interference sheath lower end, the stainless steel flexible hose at well head place needs to connect the zero line of pump variable frequency device。
Described anti-interference sheath has more piece stainless steel flexible hose series connection to form, and is connected by joint between adjacent stainless steel flexible hose, and anti-interference sheath sidewall is provided with the through hole for Inlet and outlet water, through hole and anti-interference sheath lower port and is all enclosed with one layer of stainless steel filtering net。
Two described heart yearns are two core twisted-pair feeders or two core parallel lines, it is preferable that two core twisted-pair feeders。
Described stainless steel flexible hose adopts rustless steel hollow tube, and two ends are provided with the nut for jointing。
Described stainless joint is that side cornice has the rustless steel straight joint of through hole, the lateral symmetry sidewall rustless steel straight joint with through hole or for rustless steel three way cock, preferred side cornice through hole and the two side rustless steel straight joint with through hole, hole is used for Inlet and outlet water, when water impurity is more, through hole one layer of stainless steel filtering net of parcel。
The length of two described heart yearns is more than the length of self blind area。Two described heart yearns make TDR measurement sensor measurement blind area, and during actual measurement, the two heart yearn length reserved need the length more than blind area。
The through hole of described stainless joint is provided with the screw rod along joint radial arrangement, and two heart yearns connect above through band near screw rod, and band is suspended on screw rod by gravity, and to avoid, two heart yearns are oversize to be broken by action of gravity。
Two, a kind of measurement of water level of deep well method of TDR principle:
When described sensor is vertically installed in deep-well, TDR measuring instrument is placed in ground, not only two heart yearns are transmission line but also be sensing line, during dynamic water table change, the impedance variation of two heart yearn relevant positions can be caused, the TDR data that kinetic measurement is returned, find the TDR data point at the lower extreme point place of two heart yearns and less than the minimum point of the TDR data of frequency interference threshold before lower extreme point, TDR data break between these 2 is multiplied by by demarcating the two heart yearn unit lengths obtained, as two heart yearns length in water, the overall length of two heart yearns deducts the length in water and obtains the water surface distance to well head。
Described frequency interference threshold is used for shielding frequency converter interference, has relation with the type of converter and measurement total depth, sets according to on-the-spot actual measurement situation。
Demarcate in the following ways before described sensor is installed: two heart yearns packaging sheath are put into one section in known well water, record the two heart yearn length into water, two heart yearns are measured with TDR measuring instrument, sampled data is analyzed, find the TDR data break corresponding to two points that reflection is the strongest, in sampled data, first maximum of points except blind area stretches into bottom point under water as two heart yearns, and the minimum point in sampled data is as water surface site；The distance between bottom point and water surface site under water is water-column, this water-column obtains divided by the space-number of the TDR data break between these 2 each TDR data break in the deep-well of the type water and represents two heart yearn unit lengths。
If the minimum point of the TDR data less than frequency interference threshold before lower extreme point exists multiple, then its middle sampling optimization is as minimum point。
Current existing line is all 100 meters or 200 meter of one volume, is embodied as to realize the words with 500 meters or greater length of two heart yearns, it is desirable to have joint, it does not have through hole screw rod is fixed, and line deadweight can joints apart。Therefore the present invention is adopted the mode that hung by band in the knotting of screw rod place fixing line alleviates gravity stress at each intermediate node place。
Two core twisted-pair feeders are in the absence of water, have under water preparation adhesion condition, when soaking completely, TDR pulse signal transmission speed therein is different, the two heart yearn length that each TDR sampling interval is corresponding under having water preparation to hold up situation are uncertain, so the length deducted in water by overall length calculates the water surface distance to well head
Level sensor of the present invention can realize the continuous measurement of water level, and minimum rate respectively is the resolution of TDR measuring instrument。
The feature of the present invention and providing the benefit that:
Not only the holding wire of the present invention is transmission line but also be sensing line, it is achieved water level is measured continuously, and anti-converter interference performance is strong。
Inventive sensor achieve only two holding wires situation achieve deep-well dynamic water table high-acruracy survey；Compared to current throw-in type pressure type water level sensor, under water, maintenance needs to mention its transmitter together with water pump, and maintenance extremely bothers, and the measurement main frame TDR measuring instrument of this sensor is at well head, and maintenance is changed all more convenient；
When this measuring method can overcome water level rapid decrease, the water preparation of the attachment impact on measurement result on two heart yearns。
Compared to the level sensor of the TDR measuring principle of current same type, this sensor, by the interference of the anti-interference sheath shielding converter of stainless steel flexible hose and joint composition, improves signal to noise ratio, it is possible to achieve high-acruracy survey in the deep-well having variable frequency pump to work。
Accompanying drawing explanation
Fig. 1 is the structural representation of patent of the present invention。
In figure: 1 is pump variable frequency device, 2 is water pump cable, and 3 is TDR measuring instrument, and 4 is level sensor, and 5 is pump head pipe, and 6 is the water surface, and 7 is water pump, 8, band, 9, and the zero line of pump variable frequency device。
Fig. 2 is the schematic diagram of level sensor。
In figure: 41 is two heart yearns, 42 is the anti-interference sheath of stainless steel flexible hose and joint composition。
Fig. 3 is stainless steel flexible hose schematic diagram。
In figure: 421 is the stainless steel flexible hose with female adapter, and 422 is mesopore。
Fig. 4 is rustless steel straight joint schematic diagram。
In figure: 4231 is the rustless steel straight joint with single hole, 4232 is the rustless steel straight joint with through hole。
Fig. 5 is that band through hole rustless steel straight joint is for fixing two heart yearn schematic diagrams。
In figure: 4232 is the rustless steel straight joint with through hole, and 4233 is rustless steel screw rod, and 8 is band, 41 is two core twisted-pair feeders。
Fig. 6 is that the TDR measuring instrument of embodiment is at the deep borehole measurement water level result figure having variable frequency pump to work。
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described。
As shown in Figure 1, water pump 7 is placed in the water surface 6 times, water pump 7 is connected with the pump variable frequency device 1 on ground through water pump cable 2, water pump 7 is through pump head pipe 5 draining, the level sensor 4 of the present invention includes TDR measuring instrument 3, two heart yearns 41 and anti-interference sheath 42, anti-interference sheath 42 and water pump cable 2 are bundled on pump head pipe 5 by band 8, two heart yearns 41 are axial arranged along pump head pipe 5 from water pump 7 to ground, whole two heart yearns 41 are enclosed within the anti-interference sheath 42 being mainly made up of stainless steel flexible hose 422 and joint 423, TDR measuring instrument 3 is placed in ground, TDR measuring instrument 3 is connected with the upper end of two heart yearns 4, two heart yearn 41 lower ends reach outside anti-interference sheath 42 lower end, the stainless steel flexible hose at well head place needs to connect the zero line 9 of pump variable frequency device, TDR measuring instrument 3 measures water level by two heart yearns 41。
Anti-interference sheath 42 has more piece stainless steel flexible hose 422 series connection to form, rustless steel straight joint indefinite length can be adopted in being embodied as to connect, connected by joint 423 between adjacent stainless steel flexible hose 422, anti-interference sheath 42 sidewall is provided with the through hole for Inlet and outlet water, through hole and anti-interference sheath 42 lower port and is all enclosed with one layer of stainless steel filtering net。
When being embodied as, two heart yearns 41 adopt two core twisted-pair feeders or two core parallel lines。Stainless steel flexible hose 422 adopts rustless steel hollow tube, and two ends are provided with the nut for jointing 423。
Stainless joint 423 has the rustless steel straight joint 4231 of through hole, the lateral symmetry sidewall rustless steel straight joint 4232 with through hole for side cornice or is rustless steel three way cock。
Two heart yearns 41 make TDR measurement sensor measurement blind area, and during actual measurement, the two heart yearn length reserved need the length more than blind area。
The through hole of stainless joint 423 is provided with the screw rod 4233 along joint radial arrangement, and two heart yearns 41 connect above through band 8 near screw rod 4233, and band 8 is suspended on screw rod 4233 by gravity, and to avoid, two heart yearns 41 are oversize to be broken by action of gravity。When being embodied as, sensor needs each certain length to install a stainless joint 4232 with through hole, needs to install a screw rod 4233 for bundling two heart yearns 41, can break due to action of gravity when otherwise two heart yearns are oversize in through hole。
Specific embodiments of the invention and work process thereof are as follows:
1) advanced rower is fixed: two heart yearns 41 packaging sheath are put in well water one section known, record two heart yearn 41 length into water, two heart yearns 41 are measured with TDR measuring instrument 3, sampled data is analyzed, find the TDR data break corresponding to two points that reflection is the strongest, in sampled data, first maximum of points except blind area stretches into bottom point under water as two heart yearns 41, and the minimum point in sampled data is as water surface site；The distance between bottom point and water surface site under water is well depth, well depth obtains divided by the space-number of the TDR data break between these 2 each TDR data break in the deep-well of the type water and represents two heart yearn 41 unit lengths。
2) when sensor being vertically installed in deep-well, find the TDR data point at the lower extreme point place of two heart yearns 41 and less than the minimum point of the TDR data of frequency interference threshold before lower extreme point, TDR data break between these 2 is multiplied by by demarcating two heart yearn 41 unit lengths obtained, as two heart yearns length in water, the overall length of two heart yearns 41 deducts the length in water and obtains the water surface distance to well head。
If the minimum point of the TDR data less than frequency interference threshold before lower extreme point exists multiple, then its middle sampling optimization is as minimum point。
The present embodiment illustrates for the level sensor of 90 meters of total ranges, selects the two core twisted-pair feeders of 90 meters 1 square, and set is one by one in 4 points of stainless steel flexible hoses of 1.5 meters every, and because two heart yearn overall lengths are shorter, interface all connects with band single hole straight joint。
Before installing, two heart yearns being demarcated once, 50 meters of sensors are put in well water, measure once with TDR measuring instrument, first maximum looking for TDR data is the sampled point of 255, can this point be the 134th point in Fig. 6, the end points of corresponding two heart yearns of this point；Looking for TDR data minimum point before 134th, 6 data minimum point the 54th point in figure, this point is corresponding water surface site, and point-to-point transmission is divided into 133-54=79, so the length of two heart yearns corresponding to each TDR data break is 50 meters/79=0.633 rice。According to the selected threshold value of nominal data be TDR sampled value less than 100, namely the TDR sample magnitude of water surface site corresponding point needs less than 100 just for available point position, otherwise for disturbing, filters the interference of converter improving signal to noise ratio。
Then sensor is arranged in the well of 90 meters, dynamic measurement results is as shown in Figure 6, Figure 40 rice representative sensor actual enter 40 meters of water, the water surface is to 50 meters of well head, now, the TDR sampled point that two heart yearn end points are corresponding is 128, TDR sampling optimization the 66th point that the water surface is corresponding, point-to-point transmission is every 62 points, and respective sensor measurement length in water is 62*0.633 rice=39.245, the water surface fathoms as 90-39.245=50.755, error 0.755 meter to well head。
In like manner, in figure 30 meters of representative sensors actual enter 30 meters of water, the water surface is to well head actual grade 60 meters, and the water surface is 90 meters-(123-77) * 0.633 meter=60.882 to the measured value of well head, error 0.882 meter；In figure 20 meters of representative sensors actual enter 20 meters of water, the water surface is to well head actual grade 70 meters, and the water surface is 90 meters-(119-88) * 0.633 meter=70.377 to the measured value of well head, error 0.377 meter；In figure 10 meters of representative sensors actual enter 10 meters of water, the water surface is to well head actual grade 80 meters, and the water surface is 90 meters-(113-99.5) * 0.633 meter=81.455 to the measured value of well head, error 1.455 meters。
The maximum error of embodiment is 1.455 meters/90 meters=1.6%, as can be seen here the present invention not only keep in repair replacing all more convenient, and achieve water level and measure continuously and measure accurately, anti-converter interference performance is strong, it is achieved that high-acruracy survey in the deep-well having variable frequency pump to work。
Claims (10)
1. the water level of deep well sensor of a TDR principle, water pump (7) is placed under the water surface (6), water pump (7) is connected with the pump variable frequency device (1) on ground through water pump cable (2), water pump (7) is through pump head pipe (5) draining, it is characterized in that: described level sensor (4) includes TDR measuring instrument (3), two heart yearns (41) and anti-interference sheath (42), two heart yearns (41) are axial arranged along pump head pipe (5) from water pump (7) to ground, whole two heart yearn (41) is enclosed within the anti-interference sheath (42) being mainly made up of stainless steel flexible hose (422) and joint (423), TDR measuring instrument (3) is placed in ground, TDR measuring instrument (3) is connected with the upper end of two heart yearns (4), two heart yearns (41) lower end reaches outside anti-interference sheath (42) lower end, the stainless steel flexible hose at well head place needs to connect the zero line (9) of pump variable frequency device。
2. the water level of deep well sensor of a kind of TDR principle according to claim 1 and water level measurement method thereof, it is characterized in that: described anti-interference sheath (42) has more piece stainless steel flexible hose (422) series connection to form, connected by joint (423) between adjacent stainless steel flexible hose (422), anti-interference sheath (42) sidewall is provided with the through hole for Inlet and outlet water, through hole and anti-interference sheath (42) lower port and is all enclosed with one layer of stainless steel filtering net。
3. the water level of deep well sensor of a kind of TDR principle according to claim 1, it is characterised in that: described two heart yearns (41) are two core twisted-pair feeders or two core parallel lines。
4. the water level of deep well sensor of a kind of TDR principle according to claim 1, it is characterised in that: described stainless steel flexible hose (422) adopts rustless steel hollow tube, and two ends are provided with the nut for jointing (423)。
5. the water level of deep well sensor of a kind of TDR principle according to claim 1 and 2, it is characterised in that: described stainless joint (423) has the rustless steel straight joint (4231) of through hole, the lateral symmetry sidewall rustless steel straight joint (4232) with through hole for side cornice or is rustless steel three way cock。
6. the water level of deep well sensor of a kind of TDR principle according to claim 1 and 2, it is characterised in that: the length of described two heart yearns (41) is more than the length of self blind area。
7. the water level of deep well sensor of a kind of TDR principle according to claim 5, it is characterized in that: the through hole of described stainless joint (423) is provided with the screw rod (4233) along joint radial arrangement, two heart yearns (41) connect above through band (8) near screw rod (4233), band (8) is suspended on screw rod (4233) by gravity, and to avoid, two heart yearns (41) are oversize to be broken by action of gravity。
8. it is applied to the measurement of water level of deep well method of a kind of TDR principle of the arbitrary described sensor of claim 1～7, it is characterized in that: when described sensor is vertically installed in deep-well, find the TDR data point at the lower extreme point place of two heart yearns (41) and less than the minimum point of the TDR data of frequency interference threshold before lower extreme point, TDR data break between these 2 is multiplied by by demarcating two heart yearns (41) unit length that obtains as two heart yearns length in water, the overall length of two heart yearns (41) deducts the length in water and obtains the water surface distance to well head。
9. the measurement of water level of deep well method of a kind of TDR principle according to claim 8, it is characterized in that: demarcate in the following ways before described sensor is installed: two heart yearns (41) packaging sheath are put into one section in known well water, record two heart yearns (41) length into water, two heart yearns (41) are measured with TDR measuring instrument (3), sampled data is analyzed, find the TDR data break corresponding to two points that reflection is the strongest, in sampled data, first maximum of points except blind area stretches into bottom point under water as two heart yearns (41), minimum point in sampled data is as water surface site；The distance between bottom point and water surface site under water is water-column, this water-column obtains divided by the space-number of the TDR data break between these 2 each TDR data break in the deep-well of the type water and represents two heart yearns (41) unit length。
10. the measurement of water level of deep well method of a kind of TDR principle according to claim 8, it is characterised in that: if the minimum point of the TDR data less than frequency interference threshold before lower extreme point exists multiple, then its middle sampling optimization is as minimum point。
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