CN116929469B - Differential pressure flowmeter high-low pressure conversion method and differential pressure flowmeter flow measuring method - Google Patents
Differential pressure flowmeter high-low pressure conversion method and differential pressure flowmeter flow measuring method Download PDFInfo
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- CN116929469B CN116929469B CN202311200918.6A CN202311200918A CN116929469B CN 116929469 B CN116929469 B CN 116929469B CN 202311200918 A CN202311200918 A CN 202311200918A CN 116929469 B CN116929469 B CN 116929469B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 24
- 238000011088 calibration curve Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003345 natural gas Substances 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
- 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
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
Abstract
The utility model discloses a differential pressure flowmeter high-low pressure conversion method and a differential pressure flowmeter flow measurement method, wherein the differential pressure flowmeter high-low pressure conversion method comprises the following steps: s1, acquiring a differential pressure value between a high pressure port and a low pressure port of a differential pressure gauge; s2, if the differential pressure value is a negative number, outputting a corresponding positive differential pressure value according to a negative pressure calibration curve. Under the condition that the high-low pressure port of the intelligent differential pressure gauge is reversely connected with the high-low pressure pipeline, the differential pressure gauge implementing the method can accurately obtain the differential pressure value according to the negative pressure calibration curve, and then calculate the flow rate value.
Description
Technical Field
The utility model belongs to the technical field of metering, and particularly relates to a differential pressure flowmeter high-low pressure conversion method and a differential pressure flowmeter flow measuring method.
Background
At present, an integrated intelligent differential pressure meter is available for a gas metering instrument, namely, the instrument is provided with a battery and a control system, and the flow can be automatically calculated according to the measured high-low differential pressure value through a built-in program and displayed on a display screen.
In installation environments such as skid-mounted environments, when the high-pressure pipeline and the low-pressure pipeline are respectively connected with the high-pressure port and the low-pressure port of the intelligent differential pressure gauge, the intelligent differential pressure gauge can not be normally installed, and only the high-pressure pipeline and the intelligent differential pressure gauge can be normally installed in a reverse connection mode, namely the high-pressure pipeline is communicated with the low-pressure port of the intelligent differential pressure gauge, and the low-pressure pipeline is communicated with the high-pressure port of the intelligent differential pressure gauge. However, after the high-low pressure pipeline and the intelligent differential pressure gauge are reversely connected, the differential pressure measured by the intelligent differential pressure gauge is negative, and the intelligent differential pressure gauge cannot participate in flow calculation, so that the intelligent differential pressure gauge cannot output a flow value.
Disclosure of Invention
In order to solve the problems, the utility model provides a differential pressure flowmeter high-low pressure conversion method and a differential pressure flowmeter flow measuring method, wherein under the condition that a high-low pressure port of an intelligent differential pressure meter is reversely connected with a high-low pressure pipeline, the differential pressure meter implementing the method can accurately obtain a differential pressure value, and then calculate a flow value.
The embodiment of the utility model is realized by the following technical scheme:
a differential pressure flowmeter high-low pressure conversion method, comprising the following steps:
s1, acquiring a differential pressure value between a high pressure port and a low pressure port of a differential pressure gauge;
s2, selecting and executing a corresponding differential pressure value conversion strategy according to the differential pressure value;
s3, if the differential pressure value is zero or positive, selecting to execute a differential pressure value conversion strategy I: outputting a corresponding positive pressure difference value according to the positive pressure calibration curve;
s4, if the differential pressure value is a negative number, selecting to execute a differential pressure value conversion strategy II: and outputting a corresponding positive pressure difference value according to the negative pressure calibration curve.
In one embodiment of the present utility model, the positive pressure calibration curve is determined by: and setting the actual differential pressure of the high-low pressure pipeline as delta Pj (j=positive integer), positively connecting the high-low pressure pipeline with the high-low pressure port of the differential pressure meter, introducing high-low pressure gas with the actual differential pressure as delta Pj, recording the differential pressure delta Pk (k=positive integer) measured by the differential pressure meter, obtaining a group of actual differential pressure delta Pj and detection differential pressure delta Pk data by each measurement, and linearly fitting a plurality of groups of actual differential pressure delta Pj and detection differential pressure delta Pk to obtain a positive pressure calibration curve.
In an embodiment of the present utility model, the method for determining the negative pressure calibration curve is: and setting the actual pressure difference of the high-low pressure pipeline as delta Pn (n=positive integer), reversely connecting the high-low pressure pipeline with the high-low pressure port of the differential pressure meter, introducing high-low pressure gas with the actual pressure difference of delta Pn, recording the pressure difference delta Pm (m=positive integer) measured by the differential pressure meter, obtaining a group of data of the actual pressure difference delta Pn and the detection pressure difference delta Pm by each measurement, and linearly fitting a plurality of groups of data of the actual pressure difference delta Pn and the detection pressure difference delta Pm to obtain a negative pressure calibration curve.
A method of measuring flow by a differential pressure gauge, comprising the steps of:
s1, executing the high-low pressure conversion method of the differential pressure flowmeter to obtain a differential pressure value between high-low pressure pipelines;
s2, calculating a corresponding flow value according to the differential pressure value.
The technical scheme of the utility model has at least the following advantages and beneficial effects:
the utility model realizes the conversion of the differential pressure value from negative to positive through the negative pressure calibration curve, so that even if the high and low pressure pipelines are reversely connected with the high and low pressure ports of the differential pressure meter, the corresponding differential pressure value can be accurately measured, and the flow rate value can be calculated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for switching between high and low pressure in a differential pressure flow meter according to a first embodiment of the utility model;
FIG. 2 is a flow chart of a method for measuring flow using a differential pressure gauge according to a second embodiment of the utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, if the azimuth or positional relationship indicated by the terms "inner", "outer", etc. appears to be based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model.
In the description of the present utility model, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "configured," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
As shown in fig. 1, the present embodiment provides a method for converting high and low pressure of a differential pressure flowmeter, where the differential pressure flowmeter may be an integrated intelligent differential pressure meter, that is, an instrument self-charging battery and a control system, and through a built-in program, the differential pressure meter can automatically calculate flow according to the measured high and low differential pressure values and display the flow on a display screen, and reference may be made to a chinese patent with publication number CN201583294U and patent name of a natural gas integrated intelligent differential pressure flowmeter; the differential pressure gauge may be a mechanical differential pressure gauge, and the mechanical differential pressure gauge may need additional power supply, analog-to-digital converter, processor, display, memory, etc. when implementing the present embodiment.
Specifically, the differential pressure flowmeter high-low pressure conversion method comprises the following steps:
s1, obtaining a differential pressure value between a high pressure port and a low pressure port of a differential pressure gauge through the differential pressure gauge;
s2, selecting and executing a corresponding differential pressure value conversion strategy according to the differential pressure value;
s3, if the differential pressure value is zero or positive, selecting to execute a differential pressure value conversion strategy I: outputting a corresponding positive pressure difference value according to the positive pressure calibration curve;
the actual differential pressure of the high-low pressure pipeline is set as delta P1, the high-low pressure pipeline is connected with the high-low pressure port of the differential pressure meter in a positive way, high-low pressure gas with the actual differential pressure of delta P1 is introduced, the differential pressure delta P1 measured by the differential pressure meter is recorded, and a group of actual differential pressure delta P1 and detection differential pressure delta P1 data are obtained through each measurement. And then inputting high-low pressure air of a plurality of different actual differential pressures according to a preset step distance, repeating the method to obtain actual differential pressure delta P2 and detection differential pressure delta P2 data, actual differential pressure delta P3 and detection differential pressure delta P3 data, actual differential pressure delta P4 and detection differential pressure delta P4 data, …, actual differential pressure delta Pj (j=positive integer) and detection differential pressure delta Pk (k=positive integer) data, and finally linearly fitting all the actual differential pressure delta Pj and detection differential pressure delta Pk to obtain a positive pressure calibration curve.
S4, if the differential pressure value is a negative number, selecting to execute a differential pressure value conversion strategy II: outputting a corresponding positive pressure difference value according to a negative pressure calibration curve, wherein the method for determining the negative pressure calibration curve comprises the following steps: the actual pressure difference of the high-low pressure pipeline is set as delta P1, the high-low pressure pipeline is reversely connected with the high-low pressure port of the differential pressure meter, high-low pressure gas with the actual pressure difference of delta P1 is introduced, the pressure difference delta P1 measured by the differential pressure meter is recorded, and a group of actual pressure difference delta P1 and detection pressure difference delta P1 data are obtained through each measurement. And then inputting high-low pressure air of a plurality of different actual differential pressures according to a preset step distance, repeating the method to obtain actual differential pressure delta P2 and detection differential pressure delta P2 data, actual differential pressure delta P3 and detection differential pressure delta P3 data, actual differential pressure delta P4 and detection differential pressure delta P4 data, …, actual differential pressure delta Pn (n=positive integer) and detection differential pressure delta Pm (m=positive integer) data, and finally linearly fitting all the actual differential pressure delta Pn and detection differential pressure delta Pm to obtain a negative pressure calibration curve.
It should be noted that, when the differential pressure value between the high pressure port and the low pressure port of the differential pressure flowmeter is zero, the differential pressure flowmeter executes the differential pressure value conversion strategy I, namely outputs according to the positive pressure calibration curve, and the output value is zero.
If the integrated intelligent differential pressure gauge is adopted, the detected differential pressure Δp1 is data measured by a differential pressure sensor, and if the mechanical differential pressure gauge is adopted, the detected differential pressure Δp1 is data measured by the mechanical differential pressure gauge.
The conversion program corresponding to the method is preloaded to the integrated intelligent differential pressure gauge or the processor, when the high-low pressure pipeline is reversely connected with the high-low pressure port of the differential pressure gauge, the conversion program of the differential pressure gauge converts the measured negative pressure difference value into a positive pressure difference value through the negative pressure calibration curve, so that even if the high-low pressure pipeline is reversely connected with the high-low pressure port of the differential pressure gauge, the differential pressure gauge can accurately obtain the positive pressure difference value, the corresponding flow value can be accurately measured by the positive pressure difference value, and under the working condition of a skid-mounted device and the like with narrow space, when the high-low pressure pipeline is reversely connected with the high-low pressure port of the differential pressure gauge, the differential pressure gauge adopting the method can also accurately and normally operate.
In the prior art, if the high-low pressure pipeline is reversely connected with the high-low pressure port of the differential pressure gauge, the differential pressure gauge measures a negative numerical pressure difference value, but in the subsequent calculation of calculating the corresponding flow value according to the differential pressure value, the negative numerical pressure difference value cannot participate in calculation, so that the flow value cannot be obtained. When the high-low pressure pipeline is reversely connected with the high-low pressure port of the differential pressure meter, the differential pressure meter can also convert and output a positive pressure difference value so as to calculate the follow-up flow value normally.
When the differential pressure gauge of the method provided by the embodiment is implemented, under any condition that the high-low pressure pipeline is connected with the high-low pressure port of the differential pressure gauge in a positive or reverse way, the differential pressure gauge can automatically judge according to the positive and negative of the differential pressure value, and then the differential pressure value is automatically output according to the method.
Example 2
As shown in fig. 2, the present embodiment provides a method of measuring a flow rate by a differential pressure gauge, which is the same as that of embodiment 1.
The method for measuring the flow by the differential pressure meter comprises the following steps:
s1, executing a high-low pressure conversion method of a differential pressure flowmeter to obtain a differential pressure value between high-low pressure pipelines;
s2, calculating a corresponding flow value according to the differential pressure value, wherein the corresponding flow value is calculated according to the differential pressure value, and a person skilled in the art can adopt a known technology or a conventional technology.
The differential pressure gauge implementing the method realizes the conversion of the negative differential pressure value into the positive differential pressure value through the negative pressure calibration curve, so that even if the high and low pressure pipelines are reversely connected with the high and low pressure ports of the differential pressure gauge, the corresponding flow value can be accurately obtained.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (3)
1. A differential pressure flowmeter high-low pressure conversion method is characterized by comprising the following steps:
s1, acquiring a differential pressure value between a high pressure port and a low pressure port of a differential pressure gauge;
s2, selecting and executing a corresponding differential pressure value conversion strategy according to the differential pressure value;
s3, if the differential pressure value is zero or positive, selecting to execute a differential pressure value conversion strategy I: outputting a corresponding positive pressure difference value according to the positive pressure calibration curve;
s4, if the differential pressure value is a negative number, selecting to execute a differential pressure value conversion strategy II: outputting a corresponding positive pressure difference value according to the negative pressure calibration curve;
the method for determining the negative pressure calibration curve comprises the following steps: and setting the actual pressure difference of the high-low pressure pipeline as delta Pn (n=positive integer), reversely connecting the high-low pressure pipeline with the high-low pressure port of the differential pressure meter, introducing high-low pressure gas with the actual pressure difference of delta Pn, recording the pressure difference delta Pm (m=positive integer) measured by the differential pressure meter, obtaining a group of data of the actual pressure difference delta Pn and the detection pressure difference delta Pm by each measurement, and linearly fitting a plurality of groups of data of the actual pressure difference delta Pn and the detection pressure difference delta Pm to obtain a negative pressure calibration curve.
2. The method for converting high pressure to low pressure according to claim 1, wherein said positive pressure calibration curve is determined by: and setting the actual differential pressure of the high-low pressure pipeline as delta Pj (j=positive integer), positively connecting the high-low pressure pipeline with the high-low pressure port of the differential pressure meter, introducing high-low pressure gas with the actual differential pressure as delta Pj, recording the differential pressure delta Pk (k=positive integer) measured by the differential pressure meter, obtaining a group of actual differential pressure delta Pj and detection differential pressure delta Pk data by each measurement, and linearly fitting a plurality of groups of actual differential pressure delta Pj and detection differential pressure delta Pk to obtain a positive pressure calibration curve.
3. A method of measuring flow by a differential pressure gauge, comprising the steps of:
s1, executing the high-low pressure conversion method of the differential pressure flowmeter according to claim 1 or 2 to obtain a differential pressure value between high-low pressure pipelines;
s2, calculating a corresponding flow value according to the differential pressure value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311200918.6A CN116929469B (en) | 2023-09-18 | 2023-09-18 | Differential pressure flowmeter high-low pressure conversion method and differential pressure flowmeter flow measuring method |
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| CN202311200918.6A CN116929469B (en) | 2023-09-18 | 2023-09-18 | Differential pressure flowmeter high-low pressure conversion method and differential pressure flowmeter flow measuring method |
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