CN105698898B - The water level of deep well sensor and its water level measurement method of TDR principles - Google Patents
The water level of deep well sensor and its water level measurement method of TDR principles Download PDFInfo
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- CN105698898B CN105698898B CN201610165433.1A CN201610165433A CN105698898B CN 105698898 B CN105698898 B CN 105698898B CN 201610165433 A CN201610165433 A CN 201610165433A CN 105698898 B CN105698898 B CN 105698898B
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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
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Abstract
The invention discloses a kind of water level of deep well sensor of TDR principles and its water level measurement methods.Two core wires are axial arranged along pump head pipe from water pump to ground, whole two core wires are sleeved in anti-interference sheath, TDR measuring instruments are connect with the upper end of two core wires, two core wire lower ends reach outside anti-interference sheath lower end, it is vertically installed at the lower extreme point for finding two core wires in deep-well and is less than the TDR data points of frequency interference threshold and numerical value minimum before lower extreme point, TDR data breaks between this 2 points are multiplied by by demarcating the two core wire unit lengths obtained, the overall lengths of two core wires subtract length in water obtain the water surface to well head distance.The anti-frequency converter interference performance of the present invention is strong, can realize Dynamic High-accuracy level measuring, and repair replacement is all more convenient, be particularly suitable in the deep-well for having variable frequency pump to work.
Description
Technical field
The invention belongs to detection technique fields, and in particular to the water level of deep well sensor and its water level of a kind of TDR principles
Measurement method, the level measuring under the deep-well that can be used for.
Background technology
During current water level measures, floating-ball type water level sensor can only be by switching the presence or absence of measurement water, stagewise floating ball
Although water level sensor can measure the water level of multiple depth, every grade of float switch is required for two lead-out wires, and series is more,
Lead is more；Existing ultrasonic wave is that although precision easy to use is higher for water level transmitter, but is having variable frequency pump work, is gathered
Cable, and have in the deep-well of reducing, it can not use at all, transmitting signal can be blocked by the cable that lift pipe is wound.
Although throw-in type pressure transmitter can be used to carry out level measuring in the deep-well of variable frequency pump work with high precision,
But with the intensification of water level, the pressure sensitive portion encapsulation requirement of pressure transmitter is very high, quick in 500 meters or more of deep water
Sensing unit is easily crushed and intakes, and throw-in type pressure transmitter, once damaging, the lift pipe of maintenance needs and water pump is together
Lift, fix and install back again, but to lift the cost of labor done installation again again much big for the water pump of 500 meters or more lift pipes
In a throw-in type liquid transmitter.
The water level sensor of the water level sensor and capacitance principle of existing TDR principles, in the work of no variable frequency pump
It can be used for level measuring in empty well, but when there is variable frequency pump work, the transmission line of TDR or the pole plate of capacitance sensor need
Will installation parallel with the cable of variable frequency pump, when well depth has hundreds of meters, parallel part also has hundreds of meters, when frequency converter work
When making, the frequency conversion interference that water pump cable is radiated is far longer than useful signal, causes the transmission line or capacitance sensing of TDR
Device can not work normally at all.
Invention content
In order to solve the problems, such as that background technology, the present invention propose a kind of water level of deep well sensor of TDR principles
And its water level measurement method, overcome the TDR measuring instruments measurement interference in the case where there is frequency converter service condition in water pump in the prior art
The problem of.Sensor of the invention is sleeved on the anti-interference shield being made of stainless steel flexible hose and connector for the TDR transmission lines measured
In set, the zero curve of the stainless steel tube connection pump variable frequency device of well head, this method substantially increases signal-to-noise ratio, can overcome variable frequency pump
Interference, realize deep-well dynamic water table measure.
The technical solution adopted by the present invention is：
One, a kind of water level of deep well sensor of TDR principles：
Water pump is placed in underwater, and water pump is connected through water pump cable and the pump variable frequency device on ground, and water pump is through pump head pipe
Draining, it is characterised in that：The water level sensor includes TDR measuring instruments, two core wires and anti-interference sheath, and anti-interference sheath passes through
Band is bundled on pump head pipe, and two core wires are axial arranged along pump head pipe from water pump to ground, and whole two core wires are sleeved on
In the anti-interference sheath being mainly made of stainless steel flexible hose and connector, TDR measuring instruments are placed in ground, TDR measuring instruments and two core wires
Upper end connection, two core wire lower ends reach outside anti-interference sheath lower end, and the stainless steel flexible hose at well head, which needs to connect water pump, to be become
The zero curve of frequency device.
The anti-interference sheath has more piece stainless steel flexible hose series connection to form, and passes through connector between adjacent stainless steel flexible hose
Connection, anti-interference sheath side wall are equipped with the through-hole for Inlet and outlet water, and through-hole and anti-interference sheath lower port are enclosed with one layer not
Become rusty steel strainer.
Two core wires are two core twisted-pair feeders or two core parallel lines, preferably two core twisted-pair feeders.
The stainless steel flexible hose uses stainless steel hollow tube, both ends to be equipped with the nut for jointing.
The stainless joint be one side wall with the stainless steel straight joint of through-hole, both sides symmetrical side with through-hole not
Become rusty steel straight joint or be Stainless steel tee connector, preferably one side wall with the stainless steel straight joint of through-hole and two side with through-hole,
Hole is used for Inlet and outlet water, and when water impurity is more, through-hole wraps up one layer of stainless steel filtering net.
The length of two core wires is more than the length of itself blind area.Two core wires, which do TDR measurement sensors, survey
Blind area is measured, when reality measures, the two core wire length reserved need the length more than blind area.
The through hole of the stainless joint is equipped with the screw rod along connector radial arrangement, two core wires near the screw rod on
Side is connected by band, and band is suspended on by gravity on screw rod, is broken by gravity to avoid two core wires are too long.
Two, a kind of measurement of water level of deep well method of TDR principles：
When the sensor is vertically installed in deep-well, TDR measuring instruments are placed in ground, and two core wires, which are transmission line, is again
The impedance variations of two core wire corresponding positions can be caused when dynamic water table changes by sensing line, and the TDR data returned are measured to dynamic,
It finds the TDR data points where the lower extreme point of two core wires and is less than the TDR data of frequency interference threshold before lower extreme point
Minimum point, by the TDR data breaks between this 2 points be multiplied by by demarcate obtain two core wire unit lengths, as two cores
The length of line in water, the overall lengths of two core wires subtract length in water obtain the water surface to well head distance.
The frequency interference threshold has for shielding frequency converter interference with the type and measurement total depth of frequency converter
Relationship is set according to the live practical situation that measures.
It is demarcated in the following ways before the sensor is installed：Two core wires for packaging sheath are put into one section known to
Well water in, record tripping in water two core wire length, with TDR measuring instruments measure two core wires, sampled data is analyzed, is found
Reflect the TDR data breaks corresponding to strongest two points, first maximum of points conduct in sampled data in addition to blind area
Two core wires stretch into underwater bottom point, and the minimum point in sampled data is as water surface site；Underwater bottom point and water
The distance between face position is water-column, and the space-number of the TDR data breaks between the water-column divided by this 2 points is obtained
It obtains each TDR data break in the deep-well of the type water and represents two core wire unit lengths.
If less than the minimum point of the TDR data of frequency interference threshold there are multiple before lower extreme point, wherein
Between sample as minimum point.
Current existing line be all 100 meters either 200 meters of a roll specific implementations in order to realize with 500 meters or longer length
If two core wires of degree, connector is needed, no through-hole screw rod is fixed, and line dead weight can be joints apart.Therefore the present invention uses
Knotting at screw rod by way of band suspension, fixing line mitigates gravity stress at each intermediate node.
Two core twisted-pair feeders in the absence of water, have under aqua adhesion condition, completely in the case of immersion, TDR pulse signals
Transmission speed is different inside it, is not true in the case that there is aqua to help each TDR sampling intervals corresponding two core wires length
It is fixed, thus subtract length in water with overall length calculate the water surface to well head distance
Water level sensor of the present invention can realize that the continuous measurement of water level, minimum rate respectively are the resolution ratio of TDR measuring instruments.
The features of the present invention and advantageous effect are：
The signal wire of the present invention is that transmission line is sensing line again, realizes that water level continuously measures, anti-frequency converter interference performance
By force.
Inventive sensor realizes the deep-well dynamic water table high-precision that realizes only two signal wires the case where and surveys
Amount；Compared to current throw-in type pressure type water level sensor, under water, maintenance needs lift transmitter together with water pump,
Repair is extremely troublesome, and the measurement host TDR measuring instruments of this sensor in well head, replace all more convenient by repair；
When this measurement method can overcome water level rapid decrease, the influence of the aqua that adheres on two core wires to measurement result.
Compared to the water level sensor of the TDR measuring principles of current same type, this sensor by stainless steel flexible hose and
The interference of the anti-interference sheath shielding frequency converter of connector composition, improves signal-to-noise ratio, may be implemented in the depth for having variable frequency pump to work
High-acruracy survey in well.
Description of the drawings
Fig. 1 is the structural schematic diagram of patent of the present invention.
In figure：1 is pump variable frequency device, and 2 be water pump cable, and 3 be TDR measuring instruments, and 4 be water level sensor, and 5 be pump head
Pipe, 6 be the water surface, and 7 be water pump, 8, band, 9, the zero curve of pump variable frequency device.
Fig. 2 is the schematic diagram of water level sensor.
In figure：41 be two core wires, the 42 anti-interference sheaths formed for stainless steel flexible hose and connector.
Fig. 3 is stainless steel flexible hose schematic diagram.
In figure：421 be the stainless steel flexible hose with female adapter, and 422 be mesoporous.
Fig. 4 is stainless steel straight joint schematic diagram.
In figure：4231 be the stainless steel straight joint with single hole, and 4232 be the stainless steel straight joint with through-hole.
Fig. 5 is band through-hole stainless steel straight joint for fixing two core wire schematic diagrames.
In figure：4232 be the stainless steel straight joint with through-hole, and 4233 be stainless steel screw rod, and 8 be band, and 41 be two core multiple twins
Line.
Fig. 6 is the TDR measuring instruments of embodiment in the deep borehole measurement water level result figure for having variable frequency pump to work.
Specific implementation mode
Below in conjunction with drawings and examples, the invention will be further described.
As shown in Figure 1, water pump 7 is placed under the water surface 6, water pump 7 is connect through water pump cable 2 with the pump variable frequency device 1 on ground, water
Pump 7 is drained through pump head pipe 5, and water level sensor 4 of the invention includes TDR measuring instruments 3, two core wires 41 and anti-interference sheath
42, anti-interference sheath 42 and water pump cable 2 are bundled in by band 8 on pump head pipe 5, and two core wires 41 are from water pump 7 to ground
It is axial arranged along pump head pipe 5, whole two core wires 41 be sleeved on mainly be made of stainless steel flexible hose 422 and connector 423 it is anti-dry
It disturbs in sheath 42, TDR measuring instruments 3 are placed in ground, and TDR measuring instruments 3 are connect with the upper end of two core wires 4, and two core wires, 41 lower end is stretched out
To outside 42 lower end of anti-interference sheath, the stainless steel flexible hose at well head needs to connect the zero curve 9 of pump variable frequency device, and TDR measuring instruments 3 are logical
It crosses two core wires 41 and measures water level.
Anti-interference sheath 42 has 422 series connection of more piece stainless steel flexible hose to form, and it is direct that stainless steel can be used in specific implementation
Head indefinite length connects, and is connected by connector 423 between adjacent stainless steel flexible hose 422, and 42 side wall of anti-interference sheath is equipped with and is used for
The through-hole of Inlet and outlet water, through-hole and 42 lower port of anti-interference sheath are enclosed with one layer of stainless steel filtering net.
When it is implemented, two core wires 41 use two core twisted-pair feeders or two core parallel lines.Stainless steel flexible hose 422 is using stainless
Steel hollow tube, both ends are equipped with the nut for jointing 423.
Stainless joint 423 is that one side wall carries the stainless steel straight joint 4231 of through-hole, both sides symmetrical side with through-hole
Stainless steel straight joint 4232 is Stainless steel tee connector.
Two core wires 41, which do TDR measurement sensors, measurement blind area, and when reality measures, the two core wire length reserved need greatly
Length in blind area.
The through hole of stainless joint 423 is equipped with the screw rod 4233 along connector radial arrangement, and two core wires 41 are in screw rod
Top is connected by band 8 near 4233, and band 8 is suspended on by gravity on screw rod 4233, too long by weight to avoid two core wires 41
Force effect and break.When it is implemented, sensor needs each certain length to install a stainless joint 4232 with through-hole,
It needs one screw rod 4233 of installation for bundling two core wires 41 in through-hole, can be drawn due to gravity when otherwise two core wires are too long
It is disconnected.
Specific embodiments of the present invention and its course of work are as follows：
1) advanced rower is fixed：Two core wires 41 for packaging sheath be put into one section known in well water, the two of record tripping in water
41 length of core wire measures two core wires 41 with TDR measuring instruments 3, analyzes sampled data, finds and reflect strongest two points institute
Corresponding TDR data breaks, first maximum of points in sampled data in addition to blind area stretch into underwater as two core wires 41
Bottom point, the minimum point in sampled data is as water surface site；The distance between underwater bottom point and water surface site
For well depth, the space-number of the TDR data breaks between well depth divided by is obtained to each TDR in the deep-well of the type water at this 2 points
Data break represents two core wires, 41 unit length.
2) when sensor being vertically installed in deep-well, find TDR data points where the lower extreme point of two core wires 41 and
It is less than the minimum point of the TDR data of frequency interference threshold before lower extreme point, the TDR data breaks between this 2 points is multiplied
With by demarcating two core wires, 41 unit length obtained, as the length of two core wires in water, the overall length of two core wires 41 subtracts
Length in water obtains the water surface to the distance of well head.
If less than the minimum point of the TDR data of frequency interference threshold there are multiple before lower extreme point, wherein
Between sample as minimum point.
The present embodiment illustrates by taking the water level sensor of 90 meters of total ranges as an example, selects 90 meters 1 square of two core twisted-pair feeders,
Set is one by one in 1.5 meters every 4 points of stainless steel flexible hoses, and because two core wire overall lengths are shorter, interface is all with band single hole straight joint
Connection.
Two core wires are demarcated once before installation, 50 meters of sensors are put into well water, it is primary with the measurement of TDR measuring instruments, it looks for
The sampled point that first maximum value of TDR data is 255, in Fig. 6 can the point be the 134th point, which corresponds to the end of two core wires
Point；Look for TDR data minimum points before 134th point, the 54th point of 6 data minimum point in figure, which is corresponding water surface site, at 2 points
Between be divided into 133-54=79, so the length of corresponding two core wire of each TDR data breaks is 50 meters/79=0.633 meters.According to
It is that TDR sampled values are less than 100 that nominal data, which selectes threshold value, i.e. the TDR sample magnitudes of water surface site corresponding points need to be less than 100
It is otherwise interference, to improve the interference that signal-to-noise ratio filters out frequency converter for effective point.
Then sensor in 90 meters of well, dynamic measurement results are as shown in fig. 6, Figure 40 rice representative sensor is real
Border enters 40 meters of water, and the water surface to 50 meters of well head, at this point, the corresponding TDR sampled points of two core wire endpoints are 128, the corresponding TDR of the water surface is adopted
The 66th point of sampling point position, point-to-point transmission is every 62 points, and the measurement length of respective sensor in water is 62*0.633 meters=39.245, the water surface
It fathoms to well head as 90-39.245=50.755,0.755 meter of error.
Similarly, in figure 30 meters of representative sensors it is practical enter 30 meters of water, the water surface to 60 meters of well head actual grade, the water surface to well head
Measured value be 90 meters-(123-77) * 0.633 meter=60.882,0.882 meter of error；In figure 20 meters of representative sensors it is practical enter
20 meters of water, the water surface to 70 meters of well head actual grade, the measured value of the water surface to well head is 90 meters-* 0.633 meter of (119-88)=
70.377 0.377 meter of error；In figure 10 meters of representative sensors it is practical enter 10 meters of water, the water surface to 80 meters of well head actual grade, the water surface
Measured value to well head is 90 meters-(113-99.5) * 0.633 meter=81.455,1.455 meters of error.
The worst error of embodiment is 1.455 meters/90 meters=1.6%, it can be seen that the present invention not only repairs replacement and compares
It is more convenient, and realize water level and continuously measure and measure accurately, anti-frequency converter interference performance is strong, and realizing is having frequency conversion water
High-acruracy survey in the deep-well of pump work.
Claims (8)
1. a kind of water level of deep well sensor of TDR principles, water pump (7) are placed under the water surface (6), water pump (7) through water pump cable (2) with
The pump variable frequency device (1) on ground connects, and water pump (7) is drained through pump head pipe (5), it is characterised in that：The water level sensor
(4) include TDR measuring instruments (3), two core wires (41) and anti-interference sheath (42), two core wires (41) are from water pump (7) to ground Yan Shui
Pump lift pipe (5) is axial arranged, and whole two core wire (41), which is sleeved on, to be mainly made of stainless steel flexible hose (422) and connector (423)
In anti-interference sheath (42), TDR measuring instruments (3) are placed in ground, and TDR measuring instruments (3) are connect with the upper end of two core wires (4), two cores
Line (41) lower end reaches outside anti-interference sheath (42) lower end, and the stainless steel flexible hose at well head needs to connect the zero of pump variable frequency device
Line (9)；
The through hole of the stainless joint (423) is equipped with the screw rod (4233) along connector radial arrangement, two core wires (41)
In screw rod (4233), nearby top is connected by band (8), and band (8) is suspended on by gravity on screw rod (4233), to avoid two
Core wire (41) is too long to be broken by gravity.
2. a kind of water level of deep well sensor of TDR principles according to claim 1, it is characterised in that：Described is anti-interference
Sheath (42) has more piece stainless steel flexible hose (422) series connection to form, and passes through connector (423) between adjacent stainless steel flexible hose (422)
Connection, anti-interference sheath (42) side wall are equipped with the through-hole for Inlet and outlet water, and through-hole and anti-interference sheath (42) lower port are wrapped up
There is one layer of stainless steel filtering net.
3. a kind of water level of deep well sensor of TDR principles according to claim 1, it is characterised in that：Two core wires
(41) it is two core twisted-pair feeders or two core parallel lines.
4. a kind of water level of deep well sensor of TDR principles according to claim 1, it is characterised in that：The stainless steel
Hose (422) uses stainless steel hollow tube, both ends to be equipped with the nut for jointing (423).
5. a kind of water level of deep well sensor of TDR principles according to claim 1 or 2, it is characterised in that：Described is stainless
Steel connector (423) is that stainless steel straight joint (4231), both sides symmetrical side stainless steel with through-hole of the one side wall with through-hole are straight
Connector (4232) is Stainless steel tee connector.
6. a kind of water level of deep well sensor of TDR principles according to claim 1 or 2, it is characterised in that：Two cores
The length of line (41) is more than the length of itself blind area.
7. a kind of measurement of water level of deep well method of TDR principles applied to any sensor of claim 1~6, feature
It is：When the sensor is vertically installed in deep-well, find TDR data points where the lower extreme point of two core wires (41) and
It is less than the minimum point of the TDR data of frequency interference threshold before lower extreme point, the TDR data breaks between this 2 points is multiplied
Using by demarcating length of two core wires (41) unit length obtained as two core wires in water, the overall length of two core wires (41) subtracts
Length in water obtains the water surface to the distance of well head；
It is demarcated in the following ways before the sensor is installed：Two core wires (41) for packaging sheath are put into one section known to
Well water in, record tripping in water two core wires (41) length, with TDR measuring instruments (3) measure two core wires (41), to sampled data into
Row analysis, finds the TDR data breaks reflected corresponding to strongest two points, and first in sampled data in addition to blind area is most
Big value point stretches into underwater bottom point as two core wires (41), and the minimum point in sampled data is as water surface site；Under water
Bottom point and the distance between water surface site be water-column, by the TDR data between the water-column divided by this 2 points
The space-number at interval obtains each TDR data break in the deep-well of the type water and represents two core wires (41) unit length.
8. a kind of measurement of water level of deep well method of TDR principles according to claim 7, it is characterised in that：If in lower extreme point
It is less than the minimum point of the TDR data of frequency interference threshold before there are multiple, then in-between sample is as minimum
Value point.
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