CN108759984B - Transparent pipeline liquid level measurement device - Google Patents
Transparent pipeline liquid level measurement device Download PDFInfo
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- CN108759984B CN108759984B CN201810829140.8A CN201810829140A CN108759984B CN 108759984 B CN108759984 B CN 108759984B CN 201810829140 A CN201810829140 A CN 201810829140A CN 108759984 B CN108759984 B CN 108759984B
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- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000005259 measurement Methods 0.000 title claims abstract description 42
- 238000007789 sealing Methods 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 2
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims 1
- 244000046052 Phaseolus vulgaris Species 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 235000021251 pulses Nutrition 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 241001476363 Centropyge acanthops Species 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- YWXYYJSYQOXTPL-SLPGGIOYSA-N isosorbide mononitrate Chemical compound [O-][N+](=O)O[C@@H]1CO[C@@H]2[C@@H](O)CO[C@@H]21 YWXYYJSYQOXTPL-SLPGGIOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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
- G01F23/28—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 by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
Abstract
The invention discloses a transparent pipeline liquid level measuring device, which is technically characterized by comprising a base, two support columns, a sealing plate parallel to the support columns, a sealing block arranged at the top ends of the support columns, a transparent pipeline arranged between the two support columns, and a measuring system, wherein the measuring system comprises a detecting module consisting of a plurality of infrared diodes and infrared receivers, a routing module, an analog-to-digital conversion module and a signal processing module; the route selecting module is arranged as a multi-stage multi-path analog switch, and the number of routes selected by each stage of analog switch is different; through setting up multistage multichannel analog switch, the liquid level condition in the transparent pipeline of detection that can be accurate has improved measurement accuracy.
Description
Technical Field
The invention relates to the field of medical measurement, in particular to a transparent pipeline liquid level measuring device.
Background
The liquid level in the uniform pipeline is measured, the liquid volume can be obtained, and the liquid flow rate can be measured according to the liquid level height and the pipe diameter in time.
Real-time measurement and measurement accuracy are ensured. The conventional approach is to use optical elements for both transmission and reception, where the liquid level changes the output. In order to ensure the measurement accuracy, the existing measuring device generally selects optical elements with larger volumes, so that dense installation cannot be realized, and higher accuracy is difficult to achieve.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a transparent pipeline liquid level measuring device which can achieve required precision by densely installing a plurality of small elements at a detection position.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a transparent pipeline liquid level measurement device, includes base, two vertical support columns that are fixed on the base upper surface and are parallel to each other, be parallel to the closing plate of support column, set up at the sealing block on support column top, set up transparent pipeline between two support columns and be used for measuring transparent pipeline liquid level measurement system, the sealing block is parallel to the base, transparent pipeline is parallel to the length direction axis of support column, the support column is connected with sealing block and base integration, the closing plate cooperates the sealing block to seal the top and the side of transparent pipeline liquid level device;
the measuring system comprises a detecting module composed of a plurality of infrared diodes and an infrared receiver, a routing module connected with the detecting module and used for routing signals, an analog-to-digital conversion module connected with the routing module and used for converting analog signals into digital signals, and a signal processing module connected with the routing module and used for processing the digital signals;
the sealing plates are provided with strip-shaped mounting grooves, wherein the mounting groove on one sealing plate is used for mounting an infrared receiver, and the mounting groove on the other sealing plate is used for mounting an infrared diode; the mounting groove is parallel to the length direction of the transparent pipeline;
one side of the mounting groove is provided with an electrified copper sheet communicated with one pin of the infrared receiver, one side of the mounting groove, which is away from the electrified copper sheet, is connected with a PCB in a sliding manner, the PCB is provided with a spring jumping bean for abutting against the other pin of the infrared receiver, and two ends of the PCB are connected with the route selection module through a wire arranging plate;
the routing module comprises a plurality of groups of multi-stage multi-path analog switches, and the number of the paths of each stage of analog switch in each group is different.
By adopting the technical scheme, the transparent pipeline is used for storing liquid, and the sealing plate is matched with the sealing block to seal the transparent pipeline liquid level measuring device, so that the interference of external light on a measuring result is reduced; through setting up circular telegram copper and PCB board in the mounting groove, two pins of infrared receiver are contradicted respectively on circular telegram copper and PCB board to can change the optical element of different volumes as required, thereby conveniently change and install; the detection module of the measurement system detects the liquid level condition in the transparent pipeline, when the liquid level is not detected, a vacancy signal is output, when the liquid level is detected, a real-position signal is output, the routing module selects the signal of the detection module through the multi-stage multi-channel analog switch and outputs an inquiry result signal, when the analog-to-digital conversion module receives the inquiry result signal, the analog-to-digital conversion module carries out analog-to-digital conversion on the inquiry result signal and outputs a digital signal, after the signal processing module receives the digital signal, the digital signal is sequentially compared with a threshold value input in advance in a round inquiry mode from bottom to top, when the obtained result is smaller than the threshold value, the current position is indicated to have liquid, the n+1-path signal needs to be selected for repeated detection, and when the obtained result is not smaller than the threshold value, the current position is indicated to have no liquid, and therefore the liquid level is obtained to be n-1.
Preferably, the multiple analog switches are provided in plural, and the multiple analog switches at the same level are connected to the multiple analog switches at the same higher level.
Through adopting above-mentioned technical scheme, set up the multiway switch into a plurality ofly, can accomplish the detection using few multiway switch, reduced the error, the mode of connecting the same one-level high multichannel analog switch through a plurality of multichannel analog switches of peer simultaneously can reduce the influence of shake in the circuit conversion process to measuring result to guarantee measurement accuracy.
Preferably, the infrared receiver and the infrared diodes are arranged in the corresponding mounting grooves in sequence in a one-to-one correspondence and parallel to each other, and the light rays of the infrared diodes are just received by the infrared receiver through the transparent pipeline.
By adopting the technical scheme, the infrared receiver is in one-to-one correspondence with the infrared diodes, so that the infrared receiver can only receive the signal of one infrared diode, the influence of the signal of the adjacent infrared diode is reduced, and the measurement accuracy is improved.
Preferably, a grating plate is arranged between the sealing plate and the supporting column, and a plurality of gratings for limiting the receiving light path are arranged on the grating plate.
By adopting the technical scheme, the grating can further limit the signals received by the infrared receiver and shield the signals of the adjacent infrared diodes, so that the influence of the signals of the adjacent infrared diodes is further reduced, and the measurement accuracy is improved.
Preferably, both ends of the transparent pipeline are respectively in threaded connection with the base and the sealing block.
Through adopting above-mentioned technical scheme, transparent pipeline can follow and take off between base and the sealing block, conveniently changes transparent pipeline as required, has improved work efficiency.
Preferably, a buffer member is arranged between the grating plate and the sealing plate, the buffer member is used for buffering the pressure of the sealing plate conducted to the supporting column, the buffer member comprises a rubber strip arranged between the grating plate and the sealing plate, the rubber strip is parallel to the length direction of the transparent pipeline, and the length of the rubber strip is identical to that of the mounting groove.
Through adopting above-mentioned technical scheme, the buffer layer can be formed between closing plate and grating board to less grating board receives the external impact, improved the life of grating board.
Preferably, the sealing plate is provided with a plurality of short columns, the short columns face the transparent pipeline, the buffer member and the grating are provided with mounting holes for the short columns to be inserted, and the short columns are matched with the mounting holes to be used for limiting the position of the grating plate relative to the transparent pipeline.
Through adopting above-mentioned technical scheme, the short column cooperatees with the mounting hole and can prescribe a limit to the mounted position of bolster and grating, avoids the mounted position of grating and bolster to appear the deviation and influence measuring result, has improved measurement accuracy, has improved installation effectiveness simultaneously.
Preferably, at least two transparent pipelines are arranged.
Through adopting above-mentioned technical scheme, through setting up two at least transparent pipelines, can make measuring device measure many transparent pipelines simultaneously, improved measurement of efficiency.
Preferably, the top of the sealing block is provided with a three-way valve, the three-way valve is connected to the top of the transparent pipeline, and external liquid enters the transparent pipeline through the three-way valve.
Through adopting above-mentioned technical scheme, the speed and the flow that get into transparent pipeline through three-way valve to liquid is convenient according to the liquid level in the transparent pipeline of measuring result adjustment, has improved work efficiency.
In summary, the invention has the following beneficial effects:
1. by arranging the multi-stage multi-path analog switch, the liquid level condition in the transparent pipeline can be accurately detected, and the measurement accuracy is improved;
2. by arranging the grating plate, the influence of adjacent signals on the measurement result can be reduced, and the measurement accuracy is improved;
3. through the arrangement of the infrared diodes and the infrared receivers in one-to-one correspondence, the infrared receiver can only receive the signal of one infrared diode, the influence of the signals of the adjacent infrared diodes is reduced, and the measurement accuracy is improved.
Drawings
FIG. 1 is an exploded view of a transparent pipeline liquid level measuring device;
FIG. 2 is a reverse explosion diagram of a transparent pipeline liquid level measuring device structure;
FIG. 3 is a circuit diagram of a measurement system;
FIG. 4 is a circuit diagram of a detection module;
FIG. 5 is a circuit diagram of an infrared receiving module and a routing module;
FIG. 6 is a circuit diagram of an analog-to-digital conversion module;
FIG. 7 is a circuit diagram of a signal processing module;
FIG. 8 is a cross-sectional view of a seal plate;
fig. 9 is an enlarged view of the structure at a of fig. 8.
Reference numerals: 1. a base; 2. a support column; 3. a sealing plate; 31. an infrared diode; 32. an infrared receiver; 33. a grating plate; 34. a short column; 35. a mounting hole; 36. a three-way valve; 37. a rubber strip; 4. a sealing block; 5. a transparent pipeline; 66. a mounting groove; 661. electrifying a copper sheet; 662. a PCB board; 663. spring bean-jumping.
Detailed Description
The present invention will be described in further detail below with reference to the drawings, wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower", "bottom" and "top" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
As shown in FIG. 1, a base 1, two support columns 2 vertically fixed on the upper surface of the base 1 and parallel to each other, a sealing plate 3 parallel to the support columns 2, a sealing block 4 arranged at the top ends of the support columns 2, and a transparent pipeline 5 arranged between the two support columns 2; the sealing block 4 is parallel to the base 1, the transparent pipeline 5 is parallel to the length direction axis of the support column 2, and the support column 2) is integrally connected with the sealing block 4 and the base 1; the transparent pipeline 5 is used for storing liquid, and the sealing plate 3 is matched with the sealing block 4 to seal the side face and the top end of the transparent pipeline liquid level measuring device respectively, so that the interference of external light on a measuring result is reduced; the support column 2 is connected with the sealing block 4 and the base 1 in an integrated way, so that the support column 2, the sealing block 4 and the base 1 are convenient to process.
Further, as shown in fig. 1 and 2, the sealing plate 3 is provided with a long mounting groove 66, and the mounting groove 66 is parallel to the length direction of the transparent pipeline 5; a plurality of infrared receivers 32 are sequentially arranged in the mounting groove 66 on one sealing plate 3 from top to bottom, and a plurality of infrared diodes 31 are sequentially arranged in the mounting groove 66 on the other sealing plate from top to bottom; the infrared receivers 32 are in one-to-one correspondence with the infrared diodes 31 and are parallel to each other, and the light rays of the infrared diodes 31 are just received by the infrared receivers 32 through the transparent pipeline 5, so that the influence of signals of adjacent infrared diodes 31 is reduced, and the measurement accuracy is improved.
Further, as shown in fig. 1 and 2, a grating plate 33 is disposed between the sealing plate 3 and the supporting column 2, and a plurality of gratings for defining a receiving light path are disposed on the grating plate 33; the grating can further limit the signal received by the infrared receiver 32 and shield the signal of the adjacent infrared diode 31, thereby further reducing the influence of the signal of the adjacent infrared diode 31 and improving the measurement accuracy.
Further, as shown in fig. 1 and 2, a buffer member for buffering is provided between the grating plate 33 and the sealing plate 3, and preferably, the buffer member is provided as two rubber strips 37 parallel to the length direction of the transparent pipeline 5, and the length of the rubber strips 37 is the same as the length of the mounting groove 66. The rubber strip 37 can form a buffer layer between the sealing plate 3 and the grating plate 33, so that the external impact to the grating plate 33 is reduced, and the service life of the grating plate 33 is prolonged.
Optimally, as shown in fig. 1, the sealing plate 3 is provided with a plurality of short columns 34, the short columns 34 face the transparent pipe 5, the buffer piece and the grating plate 33 are provided with mounting holes 35 for inserting the short columns 34, and the short columns 34 are matched with the mounting holes 35 to limit the position of the grating plate 33 relative to the transparent pipe 5; the short column 34 is matched with the mounting hole 35 to limit the mounting positions of the buffer piece and the grating plate 33, so that the influence on the measurement result caused by deviation of the mounting positions of the grating plate 33 and the buffer piece is avoided, the measurement accuracy is improved, and the mounting efficiency is improved.
Optimally, as shown in fig. 1 and 2, at least two transparent pipelines 5 are arranged, and two ends of each transparent pipeline 5 are respectively in threaded connection with the base 1 and the sealing block 4; the top of the sealing block 4 is provided with a three-way valve 36, the three-way valve 36 is connected to the top of the transparent pipeline 5, and external liquid enters the transparent pipeline 5 through the three-way valve 36; by arranging at least two transparent pipelines 5, the measuring device can simultaneously measure a plurality of transparent pipelines 5, so that the measuring efficiency is improved; the transparent pipeline 5 can be taken down from the space between the base 1 and the sealing block 4 by connecting the transparent pipeline 5 with the base 1 and the sealing block 4 in a threaded manner, so that the transparent pipeline 5 can be replaced conveniently as required, and the working efficiency is improved; the speed and the flow rate of liquid entering the transparent pipeline 5 are controlled through the three-way valve 36, so that the liquid level in the transparent pipeline 5 can be conveniently adjusted according to the measurement result, and the working efficiency is improved.
As shown in fig. 3, a transparent pipe liquid level measuring device further includes a measuring system for measuring the liquid level of the transparent pipe 5, the measuring system including:
the detection module is arranged on the sealing plate 3 and is used for generating infrared measurement signals;
the infrared receiving module is arranged on the sealing plate 3 and is used for receiving infrared measurement signals; when the liquid level of the transparent pipeline 5 is not measured, the infrared receiving module outputs a high-level signal; when the liquid level of the transparent pipeline 5 is measured, the infrared receiving module outputs a low-level signal;
the route selection module is connected with the infrared receiving module and used for selecting a route for the infrared receiving module; the routing module repeatedly routes the infrared receiving module from bottom to top and outputs a high-level signal or a low-level signal consistent with the selected routing signal;
the analog-to-digital conversion module is connected with the routing module and is used for receiving a high-level signal or a low-level signal from the routing module, outputting a digital signal representing 1 when the high-level signal is received and outputting a digital signal representing 0 when the low-level signal is received;
the signal processing module is connected with the analog-to-digital conversion module and is used for receiving the digital signals from the analog-to-digital conversion module; when the digital signal is received, the digital signal is compared with a threshold value input in advance, and a liquid level signal is output.
The detection module generates an infrared measurement signal, the infrared measurement signal is received by the infrared receiving module through the transparent pipeline 5, and when the liquid level of the transparent pipeline 5 is not measured, the infrared receiving module outputs a high-level signal; when the liquid level of the transparent pipeline 5 is measured, the infrared receiving module outputs a low-level signal; simultaneously, the routing module repeatedly routes the infrared receiving module from bottom to top and outputs a high-level signal or a low-level signal consistent with the selected routing signal; outputting a digital signal representing '1' when the analog-to-digital conversion module receives a high-level signal, and outputting a digital signal representing '0' when the analog-to-digital conversion module receives a low-level signal; and then when the digital processing module receives the digital signal, comparing the digital signal with a threshold value input in advance, and outputting a liquid level signal.
As shown in fig. 4, the detection module includes:
a start unit provided on an outer surface of the sealing plate 3 for outputting a start signal; preferably, the starting unit is set as a button SW;
the control output unit is connected with the starting unit and is used for receiving a starting signal; when receiving the starting signal, outputting a control signal; as shown in fig. 4, the control output unit is set as a 555 timer, the TRL pin of the 555 timer is connected with the CON phase in parallel, and is connected with the starting unit through the dc converter, and the dc converter supplies power to the control output unit; the THR pin and the GND pin of the 555 timer are grounded, the VCC pin and the RES pin are connected with an external power supply, a resistor R1 is connected between the DIS pin and the VCC pin, a resistor R2 is connected between the DIS pin and the CON pin, the resistor R1 is connected with the resistor R2 in parallel, and the OUT pin outputs a pulse signal;
the signal transmitting unit is connected with the control output unit and is used for receiving the control signal; when receiving the control signal, outputting an infrared signal; optimally, as shown in fig. 4, the signal transmitting unit is set to 128 infrared light emitting diodes DA 1-DAN which are sequentially arranged, each infrared light emitting diode is respectively connected with one current limiting resistor RA 1-RAN in series, then is integrally connected in parallel, is grounded through one adjustable current sampling resistor RC after being connected in parallel, and can adjust the transmitting intensity by adjusting the adjustable current sampling resistor RC 1;
firstly, adjusting the signal emission intensity of a signal emission unit by adjusting an adjustable current sampling resistor RC1, pressing a button SW, starting the work of the direct current converter, supplying power to a control output unit and the signal emission unit, and outputting a starting signal; when the control output unit receives the starting signal, a pulse signal is output, so that the signal transmitting unit indirectly transmits an infrared signal, and the power consumption is reduced.
As shown in fig. 5, the infrared receiving module is set up as 128 receiving diodes DB 1-DBN which are sequentially arranged and mutually connected in parallel, the receiving diodes are grounded through an external adjustable resistor RC2 after being connected in parallel, and meanwhile, the receiving diodes and the adjustable resistor RC2 after being connected in parallel are respectively connected in series with two ends of a power supply; the power supply supplies power to the receiving diode, so that the infrared receiving module continuously receives the infrared signal from the detecting module, and omission is avoided; when the liquid level of the transparent pipeline 5 is not measured, the infrared receiving module outputs a high-level signal; when the liquid level of the transparent pipeline 5 is measured, the infrared receiving module outputs a low-level signal.
As shown in fig. 5, the routing module includes a primary analog switch connected with the receiving diode of the infrared receiving module, and a secondary analog switch connected with the primary analog switch, where the primary analog switch is preferably set as a 1-8-1 analog switch with the model number of CD4051, and the secondary analog switch is preferably set as a 1-16-1 analog switch with the model number of CD74HC 4067; the pins of the first-stage analog switch are respectively connected with the output ends of the receiving diodes, and the second-stage analog switch is respectively connected with the output ends of the first-stage analog switch; the routing module repeatedly performs routing on the infrared receiving module from bottom to top, and outputs a high-level signal or a low-level signal consistent with the selected routing signal through the two-stage analog switch.
As shown IN fig. 6, the analog-to-digital conversion module is set as an analog-to-digital converter U2 with the model ADS7818, the in+ pin of the analog-to-digital converter U2 is connected with the output end of the unidirectional diode DC1, the IN-pin, the GND pin and the CONV pin of the analog-to-digital converter U2 are grounded, the VREF pin is externally connected with a power supply through a capacitor C1 to provide a reference voltage, and meanwhile, two ends of the power supply connected with the VREF pin are grounded through the capacitor C1; the VCC pin is externally connected with a power supply, and the CLK pin and the DATA pin are connected with the signal processing module; the analog-to-digital conversion module is connected to the routing module, and is used for performing analog-to-digital conversion on the high-level signal or the low-level signal when the high-level signal or the low-level signal is received, outputting a digital signal representing '1' when the high-level signal is received, and outputting a digital signal representing '0' when the low-level signal is received.
As shown in fig. 7, the signal processing module is set as a single-chip microcomputer U4 with a model number AT89C51, and is connected to the analog-to-digital conversion module, and is configured to receive the digital signal from the analog-to-digital conversion module 34; the P1.0 pin of the single chip microcomputer U4 is connected with the DATA pin of the analog-to-digital converter U2, the RST pin of the single chip microcomputer U4 is connected with the CLK pin of the analog-to-digital converter U2, the VCC pin of the single chip microcomputer U4 is connected with an external power supply, the XTAL1 pin and the XTAL2 pin of the single chip microcomputer U3 are respectively grounded through a capacitor C2 and a capacitor C3 and are connected in parallel through a crystal oscillator, and the GND pin of the single chip microcomputer U3 is grounded; when the singlechip U4 receives the digital signal, when the singlechip U3 receives the digital signal, the singlechip U4 sequentially compares the digital signal with a pre-input threshold value in a round inquiry mode from bottom to top, when the obtained result is smaller than the threshold value, the current position is indicated to have liquid, the n+1 paths of signals need to be selected to repeat the detection process, when the obtained result is not smaller than the threshold value, the current position is indicated to have no liquid, so that the obtained liquid level is n-1, the digital signal is compared with the pre-input threshold value, and the liquid level signal is output to output a digital sequence signal representing the liquid level position through pins P0.0-P0.7 and pins P2.0-P2.7.
Further, as shown in fig. 8 and 9, one side of the mounting groove 66 is provided with an energizing copper sheet 661 which is communicated with one pin of the infrared receiver 32, one side of the mounting groove 66 away from the energizing copper sheet 661 is connected with a PCB 662 in a sliding manner, the PCB 662 is provided with a spring jumping bean 663 which is used for abutting against the other pin of the infrared receiver 32, and two ends of the PCB 662 are connected with the routing module through a wiring board; two pins of the infrared receiver 32 are respectively clamped on the electrified copper plate 661 and the PCB 662, so that optical elements with different volumes can be replaced as required.
The working process comprises the following steps: firstly, a transparent pipeline 5 is arranged on a base 1, then an infrared luminous tube with a proper volume is selected according to the requirement, two pins of the infrared luminous diode are respectively abutted against an electrified copper plate and a PCB 662 in an installation groove 66, and then a sealing plate 3 is fixed on the base 1, so that the measuring environment of the transparent pipeline 5 is in a sealed state;
after liquid enters the transparent pipeline 5 through the three-way valve 36, the starting button SW is pressed, the direct current converter starts to work, and supplies power to the control output unit and the signal transmitting unit, and outputs a starting signal; when the control output unit receives the starting signal, pulse signals are output, and infrared diodes 31DA 1-DAN indirectly output infrared signals through the measuring ports; the infrared measurement signal is received by the infrared receiving module through the transparent pipeline 5;
when the liquid level of the transparent pipeline 5 is not measured, the infrared receiving module outputs a high-level signal; when the liquid level of the transparent pipeline 5 is measured, the infrared receiving module outputs a low-level signal; the routing module repeatedly performs routing on the infrared receiving module from bottom to top, outputs a high-level signal or a low-level signal consistent with the selected routing signal through the two-stage analog switch, performs analog-to-digital conversion on the high-level signal or the low-level signal when the analog-to-digital conversion module receives the high-level signal or the low-level signal, outputs a digital signal representing 1 when the high-level signal is received, and outputs a digital signal representing 0 when the low-level signal is received;
when the singlechip U4 receives the digital signal, the singlechip U3 sequentially compares the digital signal with a pre-input threshold value in a round inquiry mode from bottom to top, when the obtained result is smaller than the threshold value, the current position is indicated to have liquid, the n+1 path of signal is required to be selected to repeat the detection process, when the obtained result is not smaller than the threshold value, the current position is indicated to have no liquid, thus the liquid level is obtained, n-1, the digital signal is compared with the pre-input threshold value, and the liquid level signal is output to output a digital sequence signal representing the liquid level position through pins P0.0-P0.7 and pins P2.0-P2.7.
According to the invention, the multi-stage multi-path analog switch is arranged, so that the liquid level condition in the transparent pipeline 5 can be accurately detected, and the measurement accuracy is improved; by arranging the grating plate 33, the influence of adjacent signals on the measurement result can be reduced, and the measurement accuracy is improved; by arranging the infrared diodes 31 and the infrared receivers 32 in a one-to-one correspondence manner, the infrared receivers 32 can only receive the signal of one infrared diode 31, so that the influence of the signal of the adjacent infrared diode 31 is reduced, and the measurement accuracy is improved.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (6)
1. The utility model provides a transparent pipeline liquid level measurement device, includes base (1), two vertical support column (2) that fix in base (1) upper surface parallel to each other, be parallel to sealing plate (3) of support column (2), set up sealing block (4) on support column (2) top, set up transparent pipeline (5) between two support column (2), and be used for measuring transparent pipeline (5) liquid level's measurement system, sealing block (4) are parallel to base (1), transparent pipeline (5) are parallel to the length direction axis of support column (2), support column (2) are connected with sealing block (4) and base (1) integration, sealing plate (3) cooperation sealing block (4) seal transparent pipeline liquid level measurement device's top and side; the method is characterized in that: the measuring system comprises a detecting module composed of a plurality of infrared diodes (31) and an infrared receiver (32), a routing module connected with the detecting module and used for routing signals, an analog-to-digital conversion module connected with the routing module and used for converting analog signals into digital signals, and a signal processing module connected with the routing module and used for processing the digital signals;
the sealing plates (3) are provided with strip-shaped mounting grooves (66), wherein the mounting groove (66) on one sealing plate (3) is used for mounting the infrared receiver (32), and the mounting groove (66) on the other sealing plate (3) is used for mounting the infrared diode (31); the mounting groove (66) is parallel to the length direction of the transparent pipeline (5);
one side of the mounting groove (66) is provided with an electrified copper sheet (661) communicated with one pin of the infrared receiver (32), one side of the mounting groove (66) away from the electrified copper sheet (661) is connected with a PCB (662) in a sliding manner, the PCB (662) is provided with a spring bean (663) for abutting against the other pin of the infrared receiver (32), and two ends of the PCB (662) are connected with the routing module through a wire arranging plate;
the routing module comprises a plurality of groups of multi-stage multi-path analog switches, and the number of the paths of each stage of analog switch in each group is different; a grating plate (33) is arranged between the sealing plate (3) and the support column (2), and a plurality of gratings for limiting a receiving light path are arranged on the grating plate (33);
a buffer piece is arranged between the grating plate (33) and the sealing plate (3), and the buffer piece is used for buffering the pressure conducted by the sealing plate (3) to the support column (2);
the sealing plate (3) is provided with a plurality of short columns (34), the short columns (34) face the transparent pipeline (5), the buffer piece and the grating plate (33) are provided with mounting holes (35) for being matched with the short columns (34) to be inserted, and the short columns (34) are matched with the mounting holes (35) to be used for limiting the position of the grating plate (33) relative to the transparent pipeline (5);
the multiple analog switches are provided with a plurality of same-level multiple analog switches which are connected with the same high-level multiple analog switch.
2. The transparent pipeline liquid level measurement device according to claim 1, wherein: the infrared receivers (32) are in one-to-one correspondence with the infrared diodes (31) and are mutually parallel and sequentially arranged in the corresponding mounting grooves (66), and the light rays of the infrared diodes (31) are just received by the infrared receivers (32) through the transparent pipeline (5).
3. The transparent pipeline liquid level measurement device according to claim 1, wherein: the two ends of the transparent pipeline (5) are respectively in threaded connection with the base (1) and the sealing block (4).
4. The transparent pipeline liquid level measurement device according to claim 1, wherein: the buffer piece comprises a rubber strip (37) arranged between the grating plate (33) and the sealing plate (3), the rubber strip (37) is parallel to the length direction of the transparent pipeline (5), and the length of the rubber strip (37) is the same as the length of the mounting groove (66).
5. The transparent pipeline liquid level measurement device according to claim 1, wherein: at least two transparent pipelines (5) are arranged.
6. The transparent pipeline liquid level measurement device of claim 5, wherein: the top of the sealing block (4) is provided with a three-way valve (36), the three-way valve (36) is connected to the top of the transparent pipeline (5), and external liquid enters the transparent pipeline (5) through the three-way valve (36).
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