CN116412862A - Natural gas flow measuring device based on automatic calibration - Google Patents
Natural gas flow measuring device based on automatic calibration Download PDFInfo
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- CN116412862A CN116412862A CN202310645796.5A CN202310645796A CN116412862A CN 116412862 A CN116412862 A CN 116412862A CN 202310645796 A CN202310645796 A CN 202310645796A CN 116412862 A CN116412862 A CN 116412862A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000003345 natural gas Substances 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 7
- 230000001050 lubricating effect Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims 5
- 239000007789 gas Substances 0.000 abstract description 20
- 230000008859 change Effects 0.000 abstract description 15
- 238000000034 method Methods 0.000 description 8
- 238000009530 blood pressure measurement Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- G01F1/36—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 the pressure or differential pressure being created by the use of flow constriction
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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
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses a natural gas flow measuring device based on automatic calibration, which comprises a pressure taking mechanism, wherein the pressure taking mechanism comprises a low-speed pressure taking component and a high-speed pressure taking component. The invention belongs to the technical field of flow measurement, and particularly relates to a natural gas flow measuring device based on automatic calibration; the invention provides a self-sliding type differential pressure compensation mechanism and a non-through type temperature sensing mechanism, which adaptively calibrate the basic offset of a differential pressure sensing assembly through sensing the temperature of flowing gas, thereby compensating the measurement error caused by temperature change and achieving the technical purpose of improving the measurement accuracy.
Description
Technical Field
The invention belongs to the technical field of flow measurement, and particularly relates to a natural gas flow measuring device based on automatic calibration.
Background
The nature of the common differential pressure measuring method for natural gas flow measurement is that a mechanism for changing the flow rate is arranged in a pipeline which is vertical and has uniform flow rate, and then the differential pressure of two positions is measured according to the relation between the flow rate and the pressure of fluid described in the Bernoulli equation, so that the current flow rate and the current flow rate are obtained, and the larger the differential pressure is, the larger the flow rate of the fluid is, and the larger the flow rate is.
The differential pressure method for measuring flow has one disadvantage all the time: the measurement result is affected by temperature, because according to an ideal gas state equation, when the temperature changes, the volume of the gas changes, so that the pressure difference method only ignores the influence caused by the temperature, or the flow measured by the pressure difference method is the current volume of the gas and is not the mass; the energy carried in natural gas is mass dependent and it is therefore apparent that the manner in which only volume is measured is not accurate.
Based on the above problems, the present invention provides a natural gas flow measuring device capable of compensating for measurement errors caused by temperature changes and improving measurement accuracy.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an automatic calibration-based natural gas flow measuring device, according to an ideal gas state equation, the temperature and the volume of gas are in direct proportion, and in a differential pressure type flowmeter based on a Bernoulli equation, the larger the differential pressure is, the larger the flow rate is, and at the moment, the mass of flowing gas is unchanged, but the feedback apparent flow rate is actually larger because the flow rate and the differential pressure are changed, and in order to solve the problem, the invention provides a self-sliding differential pressure compensating mechanism and a non-through type temperature sensing mechanism, and the basic offset of a differential pressure sensing assembly is adaptively calibrated through temperature sensing of the flowing gas, so that the measuring error caused by temperature change is compensated, and the technical aim of improving the measuring accuracy is achieved.
Moreover, the annular sliding block needs to achieve a certain thrust force to slide, when the temperature change amplitude is small, the pressure change in the sealing cavity of the box body is small, and the annular sliding block cannot slide at the moment, namely, when the temperature influence exceeds a certain range, the annular sliding block can perform sliding compensation; therefore, the compensation can be performed when the temperature influence is overlarge, and the abrasion of the sealing lubricating coating and the influence on the service life caused by frequent sliding compensation of the annular sliding block when the temperature change is not great are avoided.
The technical scheme adopted by the invention is as follows: the invention provides a natural gas flow measuring device based on automatic calibration, which comprises a pressure taking mechanism, wherein the pressure taking mechanism comprises a low-speed pressure taking component and a high-speed pressure taking component, and the flow rate in a current pipeline can be known by measuring the pressure difference between the low-speed pressure taking component and the high-speed pressure taking component, so that the flow rate of gas is calculated according to a formula; the automatic sliding type differential pressure compensation device is characterized by further comprising a self-sliding type differential pressure compensation mechanism and a non-through type temperature sensing mechanism, wherein the self-sliding type differential pressure compensation mechanism is clamped between the low-speed pressure taking assembly and the high-speed pressure taking assembly, and the non-through type temperature sensing mechanism is arranged on the self-sliding type differential pressure compensation mechanism.
Further, the self-sliding differential pressure compensation mechanism comprises a sliding box body, a box body notch is formed in the inner ring of the sliding box body, the self-sliding differential pressure compensation mechanism further comprises an air pressure countermeasure component and a differential pressure induction component, the air pressure countermeasure component is arranged in the sliding box body in a sliding mode, and the differential pressure induction component is arranged on the air pressure countermeasure component.
Preferably, the air pressure countermeasure component comprises an annular sliding block and a high-precision spring, the annular sliding block is clamped and slides in the sliding box body, the sensing position of the differential pressure sensing component can be compensated through the sliding of the annular sliding block in the sliding box body, the inside of the sliding box body is divided into a box body sealing cavity and a box body pressure equalizing cavity by the annular sliding block, heat conducting holes I are uniformly distributed on the outer ring of the box body sealing cavity in an annular mode, and pressure equalizing holes are uniformly distributed on the outer ring of the box body pressure equalizing cavity in an annular mode.
As a further preferred aspect of the present invention, the annular slider is provided with a slider notch, the inner wall of the sliding box body and the annular slider are both provided with a sealing lubrication coating, the annular slider needs to achieve a certain thrust force to slide, when the amplitude of the temperature change is small, the pressure change in the sealing cavity of the box body is not large, at this time, the annular slider cannot slide, that is, when the influence of the temperature exceeds a certain range, the annular slider cannot perform sliding compensation; therefore, the compensation can be ensured when the temperature influence is overlarge, and the abrasion of a sealing lubricating coating and the influence on the service life caused by frequent sliding compensation of the annular sliding block when the temperature change is not great are avoided; the high-precision spring is arranged between the annular sliding block and the sliding box body.
As a further preferred aspect of the present invention, the differential pressure sensing assembly includes a membrane support and a differential pressure sensor, the differential pressure sensing assembly is located in the opening portion of the case, the membrane support is fixedly connected to the inner wall of the annular slider, and the differential pressure sensor is located in the membrane support, and since the differential pressure sensor is soft and has a certain sliding resistance, when there is a pressure difference between two sides of the differential pressure sensor, the differential pressure sensor will deform first, and will not cause the sliding of the annular slider.
Further, the non-through type temperature sensing mechanism comprises a heat-conducting pipe body and a heat-conducting component, wherein the two ends of the heat-conducting pipe body are respectively provided with a heat-conducting pipe air inlet end and a heat-conducting pipe air outlet end.
Preferably, the heat conduction holes II are also uniformly distributed on the heat conduction pipe body in an annular mode, the heat conduction components are clamped in the heat conduction holes II, and the temperature of gas in the heat conduction pipe body is the same as that of gas in the main pipeline.
As a further preferred aspect of the present invention, the heat conducting component includes a heat insulating layer and a heat conducting rod, the heat conducting rod is clamped in the first heat conducting hole and the second heat conducting hole, the heat insulating layer is wrapped outside the heat conducting rod, and heat carried in the heat conducting rod can be reduced as much as possible through the heat insulating layer, so that the temperature can be sensed more rapidly.
Further, the pressure-taking mechanism comprises a low-speed pressure-taking component and a high-speed pressure-taking component, and the low-speed pressure-taking component and the high-speed pressure-taking component are respectively arranged at two ends of the sliding box body.
Preferably, the low-speed pressure taking assembly comprises a front pressure taking pipe and a front pressure measuring chamber, a front chamber flange part is arranged on the front pressure measuring chamber, the front pressure measuring chamber is arranged on the sliding box body through the front chamber flange part, a front chamber interface part is further arranged on the front pressure measuring chamber, and the front pressure taking pipe is clamped in the front chamber interface part.
As a further preferable mode of the invention, the high-speed pressure taking assembly comprises a rear pressure taking pipe and a rear pressure measuring chamber, wherein a rear chamber flange part is arranged on the rear pressure measuring chamber, the rear pressure measuring chamber is arranged on the sliding box body through the rear chamber flange part, a rear chamber interface part is further arranged on the rear pressure measuring chamber, and the rear pressure taking pipe is clamped in the rear chamber interface part.
Wherein, the front pressure taking pipe should be positioned at the position with low flow velocity in the main pipeline, and the rear pressure taking pipe should be positioned at the position with low flow velocity in the main pipeline; the air inlet end of the heat-conducting pipe and the air outlet end of the heat-conducting pipe are located at positions far away from the front pressure-taking pipe and the rear pressure-taking pipe so as to reduce the influence on pressure difference measurement, the air inlet end of the heat-conducting pipe is located at the upstream of the air outlet end of the heat-conducting pipe on the main pipeline, the air inlet end of the heat-conducting pipe and the air outlet end of the heat-conducting pipe cannot be located on the same cross section, and therefore natural gas can circulate from the heat-conducting pipe body. The beneficial effects obtained by the invention by adopting the structure are as follows:
(1) The flow rate in the current pipeline can be known by measuring the pressure difference between the low-speed pressure taking assembly and the high-speed pressure taking assembly, so that the flow rate of the gas is calculated according to a formula;
(2) The sensing position of the differential pressure sensing assembly can be compensated by sliding the annular sliding block in the sliding box body;
(3) The annular sliding block can slide only when a certain thrust is needed, when the temperature change amplitude is smaller, the pressure change in the sealing cavity of the box body is not large, and the annular sliding block cannot slide at the moment, namely, when the temperature influence exceeds a certain range, the annular sliding block can perform sliding compensation; therefore, the compensation can be ensured when the temperature influence is overlarge, and the abrasion of a sealing lubricating coating and the influence on the service life caused by frequent sliding compensation of the annular sliding block when the temperature change is not great are avoided;
(4) Because the pressure difference sensor is soft in texture and the annular sliding block has certain sliding resistance, when pressure difference exists on two sides of the pressure difference sensor, the pressure difference sensor is deformed firstly, and the sliding of the annular sliding block is not caused;
(5) The heat loss of the heat carried in the heat conducting rod can be reduced as much as possible through the heat insulating layer, so that the temperature can be sensed more rapidly.
Drawings
FIG. 1 is a perspective view of a natural gas flow measuring device based on automatic calibration according to the present invention;
FIG. 2 is a front view of a natural gas flow measuring device based on automatic calibration according to the present invention;
FIG. 3 is a top view of a natural gas flow measuring device based on automatic calibration according to the present invention;
FIG. 4 is a cross-sectional view taken along section line A-A of FIG. 2;
FIG. 5 is a cross-sectional view taken along section line B-B in FIG. 4;
FIG. 6 is a cross-sectional view taken along section line C-C in FIG. 4;
FIG. 7 is an exploded view of a natural gas flow measuring device based on automatic calibration according to the present invention;
FIG. 8 is an enlarged view of a portion of the portion I of FIG. 4;
FIG. 9 is an enlarged view of a portion of the portion II of FIG. 6;
fig. 10 is an enlarged view of a portion at iii in fig. 5.
Wherein, 1, a self-sliding differential pressure compensation mechanism, 2, a non-through type temperature sensing mechanism, 3, a pressure taking mechanism, 4, a sliding box body, 5, a pneumatic countermeasure component, 6, a differential pressure sensing component, 7, a box body notch, 8, a box body sealing cavity, 9, a box body pressure equalizing cavity, 10, a pressure equalizing hole, 11, a heat conducting hole I, 12, an annular sliding block, 13, a high-precision spring, 14, a film support, 15, a differential pressure sensor, 16, a sliding block notch, 17 and a sealing lubricating coating, 18, a heat pipe body, 19, a heat conduction assembly, 20, a heat pipe air inlet end, 21, a heat pipe air outlet end, 22, a heat conduction hole II, 23, an insulating layer, 24, a heat conduction rod, 25, a low-speed pressure taking assembly, 26, a high-speed pressure taking assembly, 27, a front pressure taking pipe, 28, a front pressure measuring chamber, 29, a rear pressure taking pipe, 30, a rear pressure measuring chamber, 31, a front chamber flange part, 32, a front chamber interface part, 33, a rear chamber flange part, 34 and a rear chamber interface part.
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientation or positional relationships based on those shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
As shown in fig. 1 to 10, the invention provides an automatic calibration-based natural gas flow measurement device, which comprises a pressure measurement mechanism 3, wherein the pressure measurement mechanism 3 comprises a low-speed pressure measurement assembly 25 and a high-speed pressure measurement assembly 26, and the flow rate in a current pipeline can be known by measuring the pressure difference between the low-speed pressure measurement assembly 25 and the high-speed pressure measurement assembly 26, so that the flow rate of gas can be calculated according to a formula; the automatic sliding type differential pressure compensation device further comprises a self-sliding type differential pressure compensation mechanism 1 and a non-through type temperature sensing mechanism 2, wherein the self-sliding type differential pressure compensation mechanism 1 is clamped between the low-speed pressure taking component 25 and the high-speed pressure taking component 26, and the non-through type temperature sensing mechanism 2 is arranged on the self-sliding type differential pressure compensation mechanism 1.
The self-sliding differential pressure compensation mechanism 1 comprises a sliding box body 4, a box body opening part 7 is arranged on the inner ring of the sliding box body 4, the self-sliding differential pressure compensation mechanism 1 further comprises an air pressure countercheck assembly 5 and a differential pressure induction assembly 6, the air pressure countercheck assembly 5 is arranged in the sliding box body 4 in a sliding mode, and the differential pressure induction assembly 6 is arranged on the air pressure countercheck assembly 5.
The air pressure countering component 5 comprises an annular sliding block 12 and a high-precision spring 13, the annular sliding block 12 is clamped and slides in the sliding box body 4, the sensing position of the differential pressure sensing component 6 can be compensated through the sliding of the annular sliding block 12 in the sliding box body 4, the inside of the sliding box body 4 is divided into a box body sealing cavity 8 and a box body pressure equalizing cavity 9 by the annular sliding block 12, heat conducting holes 11 are uniformly distributed on the outer ring of the box body sealing cavity 8 in an annular mode, and pressure equalizing holes 10 are uniformly distributed on the outer ring of the box body pressure equalizing cavity 9 in an annular mode.
The annular slide block 12 is provided with a slide block notch 16, the inner wall of the sliding box body 4 and the annular slide block 12 are both provided with a sealing lubricating coating 17, the annular slide block 12 can slide only when a certain thrust is needed, when the temperature change range is smaller, the pressure change in the box body sealing cavity 8 is not large, at the moment, the annular slide block 12 cannot slide, that is, when the influence of the temperature exceeds a certain range, the annular slide block 12 can perform sliding compensation; thus, the compensation can be ensured when the temperature influence is overlarge, and the abrasion of the sealing lubricating coating 17 and the influence on the service life caused by frequent sliding compensation of the annular sliding block 12 when the temperature change is not great are avoided; the high-precision spring 13 is arranged between the annular slide block 12 and the sliding box body 4.
The differential pressure sensing assembly 6 comprises a film support 14 and a differential pressure sensor 15, the differential pressure sensing assembly 6 is located in the opening part 7 of the box body, the film support 14 is fixedly connected to the inner wall of the annular sliding block 12, the differential pressure sensor 15 is arranged in the film support 14, and the differential pressure sensor 15 is soft in texture and has certain sliding resistance on the annular sliding block 12, so when pressure difference exists on two sides of the differential pressure sensor 15, the differential pressure sensor 15 is deformed at first and cannot cause sliding of the annular sliding block 12.
The non-through type temperature sensing mechanism 2 comprises a heat pipe body 18 and a heat conduction assembly 19, wherein the two ends of the heat pipe body 18 are respectively provided with a heat pipe air inlet end 20 and a heat pipe air outlet end 21.
The heat conduction pipe body 18 is also provided with a second heat conduction hole 22 in an annular and uniform manner, the heat conduction assembly 19 is clamped in the second heat conduction hole 22, and the temperature of gas in the heat conduction pipe body 18 is the same as that of gas in the main pipeline.
The heat conduction assembly 19 comprises a heat insulation layer 23 and a heat conduction rod 24, the heat conduction rod 24 is clamped in the first heat conduction hole 11 and the second heat conduction hole 22, the heat insulation layer 23 wraps the heat conduction rod 24, heat carried in the heat conduction rod 24 can be reduced as much as possible through the heat insulation layer 23, and accordingly rapid temperature induction is achieved.
The pressure-taking mechanism 3 comprises a low-speed pressure-taking component 25 and a high-speed pressure-taking component 26, and the low-speed pressure-taking component 25 and the high-speed pressure-taking component 26 are respectively arranged at two ends of the sliding box body 4.
The low-speed pressure taking assembly 25 comprises a front pressure taking pipe 27 and a front pressure measuring chamber 28, wherein a front chamber flange part 31 is arranged on the front pressure measuring chamber 28, the front pressure measuring chamber 28 is arranged on the sliding box body 4 through the front chamber flange part 31, a front chamber interface part 32 is further arranged on the front pressure measuring chamber 28, and the front pressure taking pipe 27 is clamped in the front chamber interface part 32.
The high-speed pressure taking assembly 26 comprises a rear pressure taking pipe 29 and a rear pressure measuring chamber 30, wherein a rear chamber flange part 33 is arranged on the rear pressure measuring chamber 30, the rear pressure measuring chamber 30 is arranged on the sliding box body 4 through the rear chamber flange part 33, a rear chamber interface part 34 is further arranged on the rear pressure measuring chamber 30, and the rear pressure taking pipe 29 is clamped in the rear chamber interface part 34.
The main pipeline is generally a straight pipeline with equal diameter, and is connected by using pipe fittings such as an elbow pipe, a plate hole, a cone and the like in the middle of the straight pipeline, so that the flow velocity difference and the pressure difference are generated in the pipeline which flows uniformly originally, and then the flow velocity in the current pipeline is calculated according to the pressure difference change of a fixed position.
The front pressure taking pipe 27 should be located at a position in the main pipe where the flow rate is low, and the rear pressure taking pipe 29 should be located at a position in the main pipe where the flow rate is high; the heat pipe air inlet end 20 and the heat pipe air outlet end 21 are both located at a position far from the front pressure taking pipe 27 and the rear pressure taking pipe 29 so as to reduce the influence on pressure difference measurement, and the heat pipe air inlet end 20 is located at the upstream of the heat pipe air outlet end 21 on the main pipeline, and the heat pipe air inlet end 20 and the heat pipe air outlet end 21 cannot be located on the same cross section, so that natural gas can circulate from the heat pipe body 18.
When the pressure measuring device is specifically used, firstly, a user needs to connect the front pressure measuring tube 27 and the rear pressure measuring tube 29 at two different pressure measuring positions on the pipeline wall respectively, wherein the flow rate of the position of the front pressure measuring tube 27 is lower than that of the position of the rear pressure measuring tube 29, so that the air pressure in the front pressure measuring chamber 28 is higher than that in the rear pressure measuring chamber 30;
the gas in the natural gas main pipeline is communicated with the front pressure measuring chamber 28 and the rear pressure measuring chamber 30 but not circulated, and the air pressure in the front pressure measuring chamber 28 and the rear pressure measuring chamber 30 is the same as the pressure of the corresponding pressure taking position;
because the pressure difference exists between the two pressure taking positions, the air pressure in the front pressure measuring chamber 28 and the air pressure in the rear pressure measuring chamber 30 are different, so that the soft pressure difference sensor 15 can deform towards the side with small pressure, and the pressure difference on the two sides of the pressure difference sensor 15 can be accurately fed back through the deformation;
and then, according to the Bernoulli equation, the current fluid flow rate can be obtained, and the flow of the natural gas is further measured.
The measurement principle is the same as that of the traditional differential pressure type measurement mechanism, and the influence factor of temperature on gas is practically ignored, namely, the volume of the gas flowing at the current temperature is measured instead of the mass,
when the temperature of the medium is increased, the gas expands, the density is reduced, the flow rate is accelerated, and the flow (mass rather than volume, because the volume changes along with the temperature, the charging and the metering according to the mass are the most accurate) measured by the device is larger than the actual flow;
at this time, the temperature of the natural gas flowing through the heat pipe body 18 is also increased, so that heat can be transferred into the box sealing cavity 8 through the heat conducting rod 24, thereby increasing the pressure of the gas in the box sealing cavity 8, and the annular sliding block 12 can slide and compress the high-precision spring 13 because the air pressure in the box pressure equalizing cavity 9 is always equal to the outside;
at this time, the whole differential pressure sensing assembly 6 is offset toward the high-speed pressure taking assembly 26, which actually increases the space of the front pressure measuring chamber 28, so that the deformation amount of the differential pressure sensor 15 is reduced, and the measured value is also reduced, thereby compensating and correcting the measurement error caused by the temperature and reducing the influence of the temperature on the measurement result.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (9)
1. The utility model provides a natural gas flow measuring device based on automatic calibration, includes pressure mechanism (3), pressure mechanism (3) are got including low-speed pressure subassembly (25) and high-speed pressure subassembly (26), its characterized in that: the automatic pressure difference compensation device is characterized by further comprising a self-sliding type pressure difference compensation mechanism (1) and a non-through type temperature sensing mechanism (2), wherein the self-sliding type pressure difference compensation mechanism (1) is clamped between a low-speed pressure taking component (25) and a high-speed pressure taking component (26), and the non-through type temperature sensing mechanism (2) is arranged on the self-sliding type pressure difference compensation mechanism (1); the self-sliding type differential pressure compensation mechanism (1) comprises a sliding box body (4), a box body notch (7) is formed in the inner ring of the sliding box body (4), the self-sliding type differential pressure compensation mechanism (1) further comprises an air pressure countermeasure component (5) and a differential pressure induction component (6), the air pressure countermeasure component (5) is arranged in the sliding box body (4) in a sliding mode, and the differential pressure induction component (6) is arranged on the air pressure countermeasure component (5);
the non-through type temperature sensing mechanism (2) comprises a heat-conducting pipe body (18) and a heat-conducting component (19), wherein two ends of the heat-conducting pipe body (18) are respectively provided with a heat-conducting pipe air inlet end (20) and a heat-conducting pipe air outlet end (21).
2. An automatic calibration-based natural gas flow measurement device according to claim 1, wherein: the air pressure countermeasure component (5) comprises an annular sliding block (12) and a high-precision spring (13), wherein the annular sliding block (12) is clamped and slides in the sliding box body (4), the inside of the sliding box body (4) is divided into a box body sealing cavity (8) and a box body pressure equalizing cavity (9) by the annular sliding block (12), heat conducting holes I (11) are uniformly distributed on the outer ring of the box body sealing cavity (8), and pressure equalizing holes (10) are uniformly distributed on the outer ring of the box body pressure equalizing cavity (9).
3. An automatic calibration-based natural gas flow measurement device according to claim 2, wherein: the annular sliding block (12) is provided with a sliding block notch part (16), the inner wall of the sliding box body (4) and the annular sliding block (12) are both provided with a sealing lubricating coating (17), and the high-precision spring (13) is arranged between the annular sliding block (12) and the sliding box body (4).
4. A natural gas flow measurement device based on automatic calibration according to claim 3, characterized in that: the differential pressure sensing assembly (6) comprises a film support (14) and a differential pressure sensor (15), the differential pressure sensing assembly (6) is located in the opening part (7) of the box body, the film support (14) is fixedly connected to the inner wall of the annular sliding block (12), and the differential pressure sensor (15) is arranged in the film support (14).
5. An automatic calibration-based natural gas flow measurement device according to claim 4, wherein: and the heat conduction pipe body (18) is also provided with heat conduction holes II (22) in an annular and uniform manner, and the heat conduction assembly (19) is clamped in the heat conduction holes II (22).
6. An automatic calibration-based natural gas flow measurement device according to claim 5, wherein: the heat conduction assembly (19) comprises a heat insulation layer (23) and a heat conduction rod (24), the heat conduction rod (24) is clamped in the first heat conduction hole (11) and the second heat conduction hole (22), and the heat insulation layer (23) is wrapped outside the heat conduction rod (24).
7. An automatic calibration-based natural gas flow measurement device according to claim 6, wherein: the pressure sampling mechanism (3) comprises a low-speed pressure sampling assembly (25) and a high-speed pressure sampling assembly (26), and the low-speed pressure sampling assembly (25) and the high-speed pressure sampling assembly (26) are respectively arranged at two ends of the sliding box body (4).
8. An automatic calibration-based natural gas flow measurement device according to claim 7, wherein: the low-speed pressure taking assembly (25) comprises a front pressure taking pipe (27) and a front pressure measuring chamber (28), a front chamber flange part (31) is arranged on the front pressure measuring chamber (28), the front pressure measuring chamber (28) is arranged on the sliding box body (4) through the front chamber flange part (31), a front chamber interface part (32) is further arranged on the front pressure measuring chamber (28), and the front pressure taking pipe (27) is clamped in the front chamber interface part (32).
9. An automatic calibration-based natural gas flow measurement device according to claim 8, wherein: the high-speed pressure taking assembly (26) comprises a rear pressure taking pipe (29) and a rear pressure measuring chamber (30), a rear chamber flange part (33) is arranged on the rear pressure measuring chamber (30), the rear pressure measuring chamber (30) is arranged on the sliding box body (4) through the rear chamber flange part (33), a rear chamber interface part (34) is further arranged on the rear pressure measuring chamber (30), and the rear pressure taking pipe (29) is clamped in the rear chamber interface part (34).
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| CN116412862B (en) | 2023-08-04 |
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