CN112729421B - Multi-pipe-diameter non-full pipe flowmeter and installation and use method thereof - Google Patents
Multi-pipe-diameter non-full pipe flowmeter and installation and use method thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/18—Supports or connecting means for meters
- G01F15/185—Connecting means, e.g. bypass conduits
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Abstract
The invention belongs to the technical field of precision instruments, and particularly relates to a multi-pipe-diameter non-full-pipe flowmeter and an installation and use method thereof. The flowmeter includes: the device comprises a power supply, a measuring pipe, a resistance strain gauge component, a pipe diameter measuring component, a temperature sensor, a liquid level sensor and a processing module. The power supply is used for supplying power to the flowmeter; a first through groove and a second through groove are formed in the pipe wall of the measuring pipe, and a non-circular first through hole is formed in the center of the top end of the measuring pipe. The resistance strain assembly comprises a first resistance strain gauge and a second resistance strain gauge, and the first resistance strain gauge and the second resistance strain gauge are respectively arranged on the outer walls of the left half part and the right half part of the measuring pipe. The pipe diameter measuring assembly comprises an inserted link and a distance measuring sensor; the inserted bar is inserted in the first through hole; the ranging sensor includes a first ranging sensor and a second ranging sensor. The flowmeter can solve the problems that the flow is difficult to accurately measure when the fluid in the pipeline is not full of pipes and the same flowmeter cannot adapt to various pipe diameters.
Description
Technical Field
The invention belongs to the technical field of precision instruments, and particularly relates to a multi-pipe-diameter non-full-pipe flowmeter and an installation and use method thereof.
Background
A flow meter is a meter that indicates the measured flow rate and the total amount of fluid that has been flowing during a selected time interval. Simply, a meter for measuring the flow of fluid in a pipe or open channel. The flow meters can be classified into differential pressure type flow meters, rotor flow meters, throttling type flow meters, electromagnetic flow meters, ultrasonic flow meters and the like according to different design principles of the flow meters. The liquid flow meter and the gas flow meter are classified according to measured media.
The basic working principle of the flowmeter is that corresponding instantaneous flow is obtained by measuring the flow velocity of fluid in unit fluid cross section; and then, the integral result of the instantaneous flow rate to the time is obtained to obtain the accumulated flow rate in the specified time. For a conventional flow meter, since the fluid usually fills the measurement cavity of the flow meter when moving, only the flow rate of the fluid flowing through the measurement cavity needs to be obtained to detect the corresponding flow result.
However, in many practical scenarios, the fluid in the pipe may not be full and the fluid level may only reach a portion of the pipe. This situation often occurs, for example, in sewage discharge pipes, and conventional flowmeters are not adequate for measuring the flow rate of fluid in such pipes if temporary measurement is required. Also, with conventional flow meters, installation of the meter requires that the pipe be shut off and the pipe be cut. The installation process is very troublesome and can cause serious damage to the pipeline.
Furthermore, the same flow meter is used when measuring the fluid flow in different pipelines; because the pipe diameter types of the pipelines are various, the flow velocity of the fluid and the cross section shape of the fluid are constantly changed under the non-full pipe state; therefore, most of the conventional flowmeters cannot obtain accurate measurement results for the usage scenarios.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multi-pipe-diameter non-full-pipe flowmeter and an installation and use method thereof, wherein the flowmeter can solve the problems that the flow is difficult to accurately measure when the flow in a pipeline is not full, and the same flowmeter cannot adapt to various pipe diameters.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a multi-bore non-full pipe flow meter, the flow meter comprising: the device comprises a power supply, a measuring pipe, a resistance strain gauge component, a pipe diameter measuring component, a temperature sensor, a liquid level sensor and a processing module.
The power supply is used for supplying power to the flowmeter; the top end of the measuring pipe is sealed, a first through groove and a second through groove are formed in the pipe wall of the measuring pipe, and the first through groove and the second through groove extend to the bottom end of the pipeline along the upper section of the pipeline; the first through grooves and the second through grooves are symmetrically distributed along the longitudinal half section of the measuring pipe; the measuring pipe is divided into a left half part and a right half part by the first through groove and the second through groove; a first non-circular through hole is provided in the center of the top end of the measuring tube. The resistance strain assembly comprises a first resistance strain gauge and a second resistance strain gauge which are connected in parallel, and the first resistance strain gauge and the second resistance strain gauge are respectively arranged on the outer walls of the left half part and the right half part of the measuring pipe
The pipe diameter measuring assembly comprises an inserted link and a distance measuring sensor; the inserted bar is inserted in the first through hole; the distance measuring sensors comprise a first distance measuring sensor and a second distance measuring sensor, and the first distance measuring sensor and the second distance measuring sensor are respectively and symmetrically arranged at the bottom of the inserted link; first range finding sensor and second range finding sensor all are located the measuring tube, and the two is passed through first logical groove and second logical groove department respectively and is measured the distance between range finding sensor body and pipeline inner wall.
In the invention, the temperature sensor is used for measuring the temperature of fluid in the pipeline; the liquid level sensor is used for measuring the liquid level of the fluid in the pipeline.
The processing module is electrically connected with the power supply, the resistance strain assembly, the pipe diameter measuring assembly, the temperature sensor and the liquid level sensor; the processing module is respectively used for acquiring the resistance and the voltage at two ends of the resistance strain component; obtaining measurement results of a temperature sensor and a liquid level sensor; obtaining a measurement result of the pipe diameter measurement assembly and calculating the pipe diameter; and calculating the instantaneous flow in the pipeline and the accumulated flow in a specified time according to the data.
Wherein, the computational formula of pipe diameter D in the processing module is as follows:
D＝max{x1+x2+x0}
in the above formula, max { } represents a function for obtaining the maximum value, x1Is the detected value of the first distance measuring sensor, x2Is the detected value of the second distance measuring sensor, x0Is the distance between the first ranging sensor and the second ranging sensor;
the processing module compares the calculated value D with the standard value in the pipeline specification table in the database, and selects the pipeline specification standard value D closest to the calculated value D as the actual pipe diameter of the current pipeline;
instantaneous flow Q in the processing moduleInstant heating deviceThe calculation formula of (a) is as follows:
in the above formula, K1Is the pressure coefficient of the resistive strain component; u is the voltage across the resistive strain component; i is the current across the resistive strain component; β is the coefficient of expansion of the pipe; t is the fluid temperature; h is the fluid level; d represents the actual pipe diameter of the current pipe, Sd(h) Representing the functional relation between the fluid sectional area in the pipeline with the pipe diameter d and the fluid level h, and presetting d and S in the processing moduled(h) And a one-to-one correspondence of the functions.
Cumulative flow rate QGeneral assemblyThe calculation formula of (a) is as follows:
in the above formula, t tableShows time, QInstant heating device(t) is a function of the instantaneous flow rate with respect to time t.
Further, the liquid level sensor and the temperature sensor are located on the inner side of the tube cavity of the measuring tube at positions far away from the communication surface of the first through groove and the second through groove. In the actual measurement process, fluid can enter into the survey buret inner chamber along first logical groove and second through groove, and the position of keeping away from first logical groove and second through groove inside the survey buret chamber, fluidic velocity of flow is also more steady relatively other parts, sets up level sensor and temperature sensor in this position can reduce the interference of fluid velocity of flow to temperature and level measurement.
Furthermore, the upper end of the measuring pipe is connected with a sealing plug, and an elastic gasket is arranged on the periphery of the sealing plug.
The sealing plug is mainly used for sealing a mounting hole formed in the pipeline, wherein the elastic gasket can improve the sealing effect of the sealing plug during mounting.
Furthermore, a gauge outfit is arranged at the upper part of the sealing plug, the gauge outfit comprises a display module, and the display module is respectively used for displaying the current pipe diameter; the current instantaneous flow rate and the cumulative flow rate over a specified time.
Furthermore, a key module is also arranged in the meter head and is electrically connected with the processing module, and the key module comprises an initialization key, a soft recovery key and a hard recovery key; the key module is used for sending manual instructions to the processing module.
Further, the processing module also comprises a wireless data transmission module, the wireless data transmission module is electrically connected with the processing module, and the wireless data transmission module is used for sending the detection results of the current pipe diameter, the instantaneous flow and the accumulated flow, which are acquired by the processing module, to the remote equipment. The wireless data transmission module can send the measuring result to the remote equipment, and the situation that the measuring result on the display module cannot be read smoothly in a special installation environment is avoided.
Furthermore, set up the protecting film on surveying the outer wall of buret, first resistance foil gage and second resistance foil gage all are arranged in the protecting film and survey the intermediate layer between the buret pipe wall.
The protective film can protect surveying buret and resistance strain subassembly, avoids above-mentioned subassembly to be damaged when using in corrosive fluids, improves flowmeter's life.
Further, the power source is a rechargeable lithium battery. In a partial installation scenario, the power cord may be difficult to route, and in use, lithium battery power may solve the problem and improve portability and adaptability of the flow meter.
The invention also provides a method for installing and using the multi-caliber non-full-pipe flowmeter, which is applied to the installation and use of the multi-caliber non-full-pipe flowmeter as claimed in the claim and comprises the following steps:
(1) determining the installation position of a flowmeter in a fluid pipeline, and arranging an installation hole at the midpoint above the pipeline, wherein the aperture of the installation hole is matched with the outer diameter of a sealing plug of the flowmeter;
(2) extending the measuring pipe into a fluid pipeline to be measured along the mounting hole, keeping the measuring pipe vertical, and enabling a communication surface of the first through groove and the second through groove to be vertical to the flow direction of the fluid;
(3) inputting a manual instruction to the processing module through the initialization key, performing initialization setting on the flowmeter, and then lifting the measuring tube up and down until the specified measuring period duration is reached; completing the pipe diameter measurement of the pipeline;
(4) after the pipe diameter measurement is finished, the measuring pipe is rotated to enable the communication surface of the first through groove and the second through groove to be parallel to the flow direction of the fluid, and the sealing plug and the mounting hole are tightly plugged by downward pressing;
(5) after the installation process of the previous step is completed, the flowmeter starts to measure.
Further, the initialization key is used for sending an initialization setting instruction to the processing module; after the instruction is issued, the processing module counts the measurement result of the pipe diameter measurement assembly in a specified time period and determines the pipe diameter of the current pipeline; then, starting to count the instantaneous flow and the accumulated flow;
the soft reduction key is used for sending a weak reduction instruction to the processing module; after the instruction is issued, the processing module automatically returns the current accumulated flow measurement result to zero and measures the flow again;
the hard reduction key is used for sending a strong reduction instruction to the processing module, and after the instruction is issued, the processing module automatically clears the measurement results of the pipe diameter, the instantaneous flow and the accumulated flow; and waits for the initial setting command to be issued again.
The invention provides a multi-pipe-diameter non-full pipe flowmeter and an installation and use method thereof, which have the following beneficial effects:
the flowmeter can accurately measure the fluid flow in the pipeline under the non-full pipe state, has higher measurement precision, and has no special limit on the liquid level, the pressure and the like of the fluid in the pipeline. Meanwhile, the flowmeter can also be suitable for pipelines with different pipe diameters, and the application range is wider.
The installation and the use process of the flowmeter are very simple; the fluid in the pipeline does not need to be cut off or the pipeline does not need to be cut in the process of installing the flowmeter; only the top of the pipeline is provided with a mounting hole. Meanwhile, the pipeline can be sealed again after the flowmeter is installed, and the damage to the structure of the pipeline is small.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view showing the overall structure of a multi-tube-diameter non-full-tube flowmeter according to example 1 of the present invention;
FIG. 2 is a disassembled view of the multi-tube-diameter non-full-tube flowmeter in example 1 of the present invention;
FIG. 3 is a block diagram of a multi-tube-diameter non-full-tube flowmeter according to example 1 of the present invention;
FIG. 4 is a flow chart of a method for installing and using a flow meter according to embodiment 2 of the present invention;
labeled as:
1. a power source; 2. a measurement tube; 3. a resistive strain component; 4. a pipe diameter measuring assembly; 5. a temperature sensor; 6. a liquid level sensor; 7. a display module; 8. a key module; 9. a wireless data transmission module; 10. a gauge head; 11. a sealing plug; 21. a first through groove; 23. a first through hole; 31. a first resistive strain gauge; 32. a second resistive strain gage; 41. inserting a rod; 42. a first ranging sensor; 43. a second ranging sensor; 81. initializing a key; 82. a soft reduction bond; 83. a hard reducing bond; 100. a processing module; 111. an elastic washer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a multi-tube-diameter non-full tube flow meter including: power supply 1, measuring tube 2, resistive strain gauge assembly, pipe diameter measuring assembly 4, temperature sensor 5, level sensor 6, and processing module 100.
Wherein, the power supply 1 is used for supplying power to the flowmeter; the top end of the measuring pipe 2 is sealed, a first through groove 21 and a second through groove are formed in the pipe wall of the measuring pipe 2, and the first through groove 21 and the second through groove extend to the bottom end of the pipeline along the upper section of the pipeline; the first through grooves 21 and the second through grooves are symmetrically distributed along the longitudinal half section of the measuring pipe 2; the first through groove 21 and the second through groove are divided into a left half and a right half of the measuring pipe 2; a first through hole 23 of non-circular shape is provided in the center of the top end of the measuring tube 2. The electrical resistance strain assembly 3 includes a first electrical resistance strain gauge 31 and a second electrical resistance strain gauge 32 connected in parallel with each other, the first electrical resistance strain gauge 31 and the second electrical resistance strain gauge 32 being provided on the outer walls of the left half and the right half of the measurement pipe 2, respectively.
The pipe diameter measuring assembly 4 comprises an inserted rod 41 and a distance measuring sensor; the inserting rod 41 is inserted into the first through hole 23; the distance measuring sensors comprise a first distance measuring sensor 42 and a second distance measuring sensor 43, and the first distance measuring sensor 42 and the second distance measuring sensor 43 are respectively and symmetrically arranged at the bottom of the inserted rod 41; the first distance measuring sensor 42 and the second distance measuring sensor 43 are both located in the measuring pipe 2, and measure the distance between the distance measuring sensor body and the inner wall of the pipeline through the first through groove 21 and the second through groove respectively.
In this embodiment, the temperature sensor 5 is used for measuring the temperature of the fluid in the pipeline of the pipe 2; the level sensor 6 is used to measure the level of the fluid in the pipe 2.
As shown in fig. 3, the processing module 100 is electrically connected with a power supply 1, a resistance strain assembly 3, a pipe diameter measuring assembly 4, a temperature sensor 5 and a liquid level sensor 6; the processing module 100 is used for acquiring the resistance and the voltage at two ends of the resistance strain component 3 respectively; obtaining the measurement results of the temperature sensor 5 and the liquid level sensor 6; obtaining the measurement result of the pipe diameter measurement component 4 and calculating the pipe diameter; and calculating the instantaneous flow in the pipeline and the accumulated flow in a specified time according to the data.
Wherein, the calculation formula of pipe diameter D in processing module 100 is as follows:
D＝max{x1+x2+x0}
in the above formula, max { } represents a function for obtaining the maximum value, x1Is a detected value, x, of the first distance measuring sensor 422Is the detected value, x, of the second distance measuring sensor 430Is the distance between the first distance measuring sensor 42 and the second distance measuring sensor 43;
the processing module 100 compares the calculated value D with the standard value in the pipeline specification table in the database, and selects the pipeline specification standard value D closest to the calculated value D as the actual pipe diameter of the current pipeline;
instantaneous flow Q in the processing module 100Instant heating deviceThe calculation formula of (a) is as follows:
in the above formula, K1Is the pressure coefficient of the resistive strain component 3; u is the voltage across the resistive strain component 3; i is the current across the resistive strain component 3; β is the coefficient of expansion of the pipe; t is the fluid temperature; h is the fluid level; d represents the actual pipe diameter of the current pipe, Sd(h) Representing the functional relationship between the cross-sectional area of the fluid in the pipeline with the pipe diameter d and the fluid level h, and the processing modulePresetting d and S in block 100d(h) And a one-to-one correspondence of the functions.
Cumulative flow rate QGeneral assemblyThe calculation formula of (a) is as follows:
in the above formula, t represents time, QInstant heating device(t) is a function of the instantaneous flow rate with respect to time t.
The flow meter in this example operates as follows:
before the flowmeter is installed and used, a user measures the inner diameter of a pipeline through the lifting flowmeter. During measurement, the distance between the inner walls of the two sides of the pipeline at different heights is changed continuously, and the measurement results of the first distance measuring sensor 42 and the second distance measuring sensor 43 are also changed continuously. Wherein, the maximum value measured by the two distance measuring sensors is the real inner diameter of the pipeline. In order to further eliminate the measurement error, the processor in this embodiment is further internally provided with a comparison table of the standard pipe diameter, and the standard pipe diameter of the pipe can be determined by comparing the measurement result with the data in the comparison table. In combination with the value of the pipe diameter, the height of the liquid level in the high pipe as a function of the cross-sectional area of the flow can be determined. The pipe diameter value and the sectional area function have one-to-one corresponding functional relationship.
After the flowmeter is installed and used; a part of the fluid in the pipe will pass along between the first through slot 21 and the second through slot in the middle of the measuring tube 2, so that the cavity in the middle of the measuring tube 2 is filled. The level sensor 6 and the temperature sensor 5 inside the measuring tube 2 are immersed in the fluid; a level sensor 6 may measure the level of fluid passing through the length of tubing and a temperature sensor 5 measures the temperature of the fluid. From the level height, the processor can determine the cross-sectional area of the fluid at that state. The temperature measurement result is mainly used for temperature compensation of the measurement result, and the influence of temperature change on measurement accuracy is reduced.
Meanwhile, since a small part of the fluid passes along the first through grooves 21 and the second through grooves, a large part of the fluid passes along both sides of the resistance strain assembly 3; these fluids, when in motion, impact the first and second resistive strain gauges 31 and 32 in the resistive strain assembly 3, causing the resistive strain gauges to deform. The deformation changes the resistance value of the resistive strain gage such that the current through the resistive strain component 3 changes. The flow rate of the fluid can be calculated by combining the measured change of the electrical parameter in the resistance strain component 3 and the pressure coefficient of the resistance strain gauge; and then the current instantaneous flow can be calculated by combining the fluid flow speed and the fluid sectional area. And finally, integrating the instantaneous flow with time to obtain the total flow of the corresponding time.
In this embodiment, the liquid level sensor 6 and the temperature sensor 5 are located at positions away from the communicating surface of the first through groove 21 and the second through groove on the inner side of the lumen of the measurement pipe 2. In the actual measurement process, the fluid can enter the inner cavity of the measuring pipe 2 along the first through groove 21 and the second through groove, the flow rate of the fluid is more stable relative to other parts at the position far away from the first through groove 21 and the second through groove in the pipe cavity of the measuring pipe 2, and the interference of the flow rate of the fluid on the temperature and liquid level measurement can be reduced by arranging the liquid level sensor 6 and the temperature sensor 5 at the position.
The upper end of the measuring tube 2 is connected with a sealing plug 11, and the periphery of the sealing plug 11 is provided with an elastic gasket 111. The sealing plug 11 is mainly used for sealing a mounting hole formed in a pipeline, wherein the elastic gasket 111 can improve the sealing effect of the sealing plug 11 during mounting.
A gauge outfit 10 is arranged at the upper part of the sealing plug 11, the gauge outfit 10 comprises a display module 7, and the display module 7 is respectively used for displaying the current pipe diameter; the current instantaneous flow rate and the cumulative flow rate over a specified time.
In this embodiment, the meter head 10 of the flow meter is further provided with a key module 8, the key module 8 is electrically connected to the processing module 100, and the key module 8 includes an initialization key 81, a soft recovery key 82, and a hard recovery key 83; the key module 8 is configured to send a manual instruction to the processing module 100.
The processing module 100 further comprises a wireless data transmission module 9, the wireless data transmission module 9 is electrically connected with the processing module 100, and the wireless data transmission module 9 is used for sending the detection results of the current pipe diameter, the instantaneous flow and the accumulated flow, which are acquired by the processing module 100, to the remote device. The wireless data transmission module 9 can send the measurement result to the remote device, so that the situation that the measurement result on the display module 7 cannot be read smoothly in a special installation environment is avoided.
Set up the protecting film on surveying buret 2's the outer wall, first resistance strain gage 31 and second resistance strain gage 32 all are arranged in the protecting film and survey the intermediate layer between buret 2 pipe wall. The protecting film can protect surveying buret 2 and resistance strain subassembly 3, avoids above-mentioned subassembly to be damaged when using in corrosive fluids, improves flowmeter's life.
In this embodiment, the power supply 1 of the flow meter is a rechargeable lithium battery. In a partial installation scenario, the wiring of the power supply 1 line may be difficult, and in use, lithium battery power can solve the problem and improve the portability and adaptability of the flow meter.
Example 2
This embodiment provides a method for installing and using a multi-tube-diameter non-full tube flowmeter, which is applied to the installation and use of the multi-tube-diameter non-full tube flowmeter in embodiment 1, as shown in fig. 4, and includes the following steps:
(1) determining the installation position of a flowmeter in a fluid pipeline, and arranging an installation hole at the midpoint above the pipeline, wherein the aperture of the installation hole is matched with the outer diameter of a sealing plug 11 of the flowmeter;
(2) extending the measuring pipe 2 into a fluid pipeline to be measured along the mounting hole, keeping the measuring pipe 2 vertical, and enabling a communication surface of the first through groove 21 and the second through groove to be vertical to the flow direction of the fluid;
(3) inputting a manual instruction to the processing module 100 through the initialization key 81, performing initialization setting on the flowmeter, and then lifting the measuring tube 2 up and down until the specified measuring period duration is reached; completing the pipe diameter measurement of the pipeline;
(4) after the pipe diameter measurement is finished, the measuring pipe 2 is rotated to enable the communication surface of the first through groove 21 and the second through groove to be parallel to the flow direction of the fluid, and the sealing plug 11 and the mounting hole are tightly plugged by pressing downwards;
(5) after the installation process of the previous step is completed, the flowmeter starts to measure.
The initialization key 81 is used to send an initialization setting instruction to the processing module 100; after the instruction is issued, the processing module 100 counts the measurement result of the pipe diameter measurement component 4 in a specified time period, and determines the pipe diameter of the current pipeline; then, starting to count the instantaneous flow and the accumulated flow;
the soft reduction key 82 is used for sending a weak reduction instruction to the processing module 100; after the instruction is issued, the processing module 100 automatically returns the current accumulated flow measurement result to zero and re-measures the flow;
the hard reduction key 83 is used for sending a strong reduction instruction to the processing module 100, and after the instruction is issued, the processing module 100 automatically clears the measurement results of the pipe diameter, the instantaneous flow and the accumulated flow; and waits for the initial setting command to be issued again.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multi-bore non-full pipe flow meter, comprising: the flow meter includes:
a power supply for powering the flow meter;
the top end of the measuring pipe is sealed, a first through groove and a second through groove are formed in the pipe wall of the measuring pipe, and the first through groove and the second through groove extend to the bottom end of the pipeline along the upper section of the pipeline; the first through grooves and the second through grooves are symmetrically distributed along the longitudinal half section of the measuring pipe; the first through groove and the second through groove divide the measuring pipe into a left half part and a right half part; a first non-circular through hole is formed in the center of the top end of the measuring pipe;
the resistance strain assembly comprises a first resistance strain gauge and a second resistance strain gauge which are connected in parallel, and the first resistance strain gauge and the second resistance strain gauge are respectively arranged on the outer walls of the left half part and the right half part of the measuring tube;
the pipe diameter measuring assembly comprises an inserted bar and a distance measuring sensor; the inserted bar is inserted in the first through hole; the distance measuring sensors comprise a first distance measuring sensor and a second distance measuring sensor, and the first distance measuring sensor and the second distance measuring sensor are respectively and symmetrically arranged at the bottom of the inserted link; the first distance measuring sensor and the second distance measuring sensor are both positioned in the measuring pipe and respectively measure the distance between the distance measuring sensor body and the inner wall of the pipeline through the first through groove and the second through groove;
a temperature sensor for measuring the temperature of the fluid in the conduit;
a level sensor for measuring a level of fluid in the conduit;
the processing module is electrically connected with the power supply, the resistance strain assembly, the pipe diameter measuring assembly, the temperature sensor and the liquid level sensor; the processing module is respectively used for acquiring the resistance and the voltage at two ends of the resistance strain component; obtaining measurement results of a temperature sensor and a liquid level sensor; acquiring a pipe diameter measuring result of the pipe diameter measuring assembly; according to the resistance, the voltage, the measurement results of the temperature sensor and the liquid level sensor and the pipe diameter measurement result; calculating the instantaneous flow in the pipeline and the accumulated flow in a specified time;
wherein, the computational formula of pipe diameter D in the processing module is as follows:
D＝max{x1+x2+x0}
in the above formula, max { } represents a function for obtaining the maximum value, x1Is the detected value of the first distance measuring sensor, x2Is the detected value of the second distance measuring sensor, x0Is the distance between the first ranging sensor and the second ranging sensor;
the processing module compares the calculated value D with the standard value in the pipeline specification table in the database, and selects the pipeline specification standard value D closest to the calculated value D as the actual pipe diameter of the current pipeline;
instantaneous flow Q in a processing moduleInstant heating deviceThe calculation formula of (a) is as follows:
in the above formula, K1Is the pressure coefficient of the resistive strain component; u is the voltage across the resistive strain component; i is the current across the resistive strain component; β is the coefficient of expansion of the pipe; t is the fluid temperature; h is the fluid level; d represents the actual pipe diameter of the current pipe, Sd(h) Representing the functional relation between the fluid sectional area in the pipeline with the pipe diameter d and the fluid level h; standard value d and function S for pipeline specificationd(h) The processing modules are preset with corresponding mapping relations;
the accumulated flow QGeneral assemblyThe calculation formula of (a) is as follows:
in the above formula, t represents time, QInstant heating device(t) is a function of the instantaneous flow rate with respect to time t.
2. The multi-bore non-full tube flow meter of claim 1, wherein: the liquid level sensor and the temperature sensor are positioned on the inner side of the tube cavity of the measuring tube and far away from the communication surface of the first through groove and the second through groove.
3. The multi-bore non-full tube flow meter of claim 2, wherein: the upper end of the measuring pipe is connected with a sealing plug, and an elastic gasket is arranged on the periphery of the sealing plug.
4. The multi-bore non-full tube flow meter of claim 3, wherein: a gauge outfit is arranged at the upper part of the sealing plug, the gauge outfit comprises a display module, and the display module is respectively used for displaying the current pipe diameter; the current instantaneous flow rate and the cumulative flow rate over a specified time.
5. The multi-bore non-full tube flow meter of claim 4, wherein: the meter head is also provided with a key module, the key module is electrically connected with the processing module, and the key module comprises an initialization key, a soft recovery key and a hard recovery key; the key module is used for sending manual instructions to the processing module.
6. The multi-bore non-full tube flow meter of claim 5, wherein: the processing module also comprises a wireless data transmission module, the wireless data transmission module is electrically connected with the processing module, and the wireless data transmission module is used for sending the detection results of the current pipe diameter, the instantaneous flow and the accumulated flow, which are acquired by the processing module, to remote equipment.
7. The multi-bore non-full tube flow meter of claim 6, wherein: set up the protecting film on surveying the outer wall of buret, first resistance foil gage and second resistance foil gage all are arranged in the protecting film and survey the intermediate layer between the buret pipe wall.
8. The multi-bore non-full tube flow meter of claim 1, wherein: the power supply is a rechargeable lithium battery.
9. A method for installing and using a multi-diameter non-full pipe flowmeter is characterized in that: the method is applied to the installation and use of the multi-diameter non-full pipe flowmeter of claim 7, and comprises the following steps:
(1) determining the installation position of a flowmeter in a fluid pipeline, and arranging an installation hole at the midpoint above the pipeline, wherein the aperture of the installation hole is matched with the outer diameter of a sealing plug of the flowmeter;
(2) extending the measuring pipe into a fluid pipeline to be measured along the mounting hole, keeping the measuring pipe vertical, and enabling a communication surface of the first through groove and the second through groove to be vertical to the flow direction of the fluid;
(3) inputting a manual instruction to the processing module through an initialization key, carrying out initialization setting on the flowmeter, and then lifting the measuring tube up and down until the specified measuring period duration is reached; completing the pipe diameter measurement of the pipeline;
(4) after the pipe diameter measurement is finished, the measuring pipe is rotated to enable the communication surface of the first through groove and the second through groove to be parallel to the flow direction of the fluid, and the sealing plug and the mounting hole are tightly plugged by downward pressing;
(5) after the installation process of the previous step is completed, the flowmeter starts to measure.
10. A method of installing and using a multi-bore non-full pipe flow meter according to claim 9, wherein: the initialization key is used for sending an initialization setting instruction to the processing module; after the instruction is issued, the processing module counts the measurement result of the pipe diameter measurement assembly in a specified time period and determines the pipe diameter of the current pipeline; then, starting to count the instantaneous flow and the accumulated flow;
the soft reduction key is used for sending a weak reduction instruction to the processing module; after the instruction is issued, the processing module automatically resets the current accumulated flow measurement result to zero and measures again;
the hard reduction key is used for sending a strong reduction instruction to the processing module, and after the instruction is issued, the processing module automatically clears the measurement results of the pipe diameter, the instantaneous flow and the accumulated flow; and waits for the initial setting command to be issued again.
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