CN110319891B - High-precision wide-range integrated differential pressure type flow measuring device - Google Patents
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- CN110319891B CN110319891B CN201910621518.XA CN201910621518A CN110319891B CN 110319891 B CN110319891 B CN 110319891B CN 201910621518 A CN201910621518 A CN 201910621518A CN 110319891 B CN110319891 B CN 110319891B
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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
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
- G01K13/026—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow of moving liquids
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Abstract
The invention provides a high-precision wide-range integrated differential pressure type flow measuring device, which comprises an integrated throttling device, a pressure detecting device, a temperature detecting device, a high-range flow measuring device, a low-range flow measuring device and a flow integrating instrument, wherein the integrated throttling device comprises a throttling device, a pressure guiding device and a pipeline main body which are integrally formed, and the flow integrating instrument is respectively in communication connection with the pressure detecting device, the temperature detecting device, the high-range flow measuring device and the low-range flow measuring device; the flow integrating instrument can automatically switch the flow value measured by the high-range flow measuring device and the flow value measured by the low-range flow measuring device according to the actually measured flow value, and performs compensation calculation and display on the switched flow value. The device has the advantages of high measurement precision, wide measuring range, convenient installation, simple operation, convenient maintenance and the like, and brings great convenience to the measurement of the fluid flow.
Description
Technical Field
The invention relates to the technical field of flow measurement, in particular to a high-precision wide-range integrated differential pressure type flow measurement device.
Background
A differential pressure flow meter is a meter that measures flow through differential pressure created by a throttling device installed in a pipe, known pipe dimensions, and fluid conditions. The method has the advantages of low price, mature technology, stable and reliable performance, convenient verification and the like, and is widely used in various fields related to fluid detection and metering.
Currently, most differential pressure type flowmeters for measuring flow have low measurement accuracy, such as a flowmeter disclosed in chinese patent CN207963969U, comprising: wedge-shaped flow sensor, differential pressure transmitter and flow integrating instrument; the wedge-shaped flow sensor includes: the device comprises a measuring tube, a flange plate, an upstream pressure taking port, a downstream pressure taking port, an upstream pressure guiding tube, a downstream pressure guiding tube, a three-valve group and a wedge body fixed on the inner wall of the measuring tube; the top angle of the wedge body is smooth, the top angle of the wedge body is downward, and the structure is favorable for smooth passing of liquid or viscous liquid containing suspended particles and a dirty medium; and a temperature sensor is also arranged on the inner wall of the measuring tube.
As can be seen from the above-mentioned publication, most of the existing differential pressure type flowmeter is composed of a single differential pressure transmitter and a throttling device, and the differential pressure type flowmeter adopting the structure has serious drawbacks, namely, the flow and the differential pressure are in a proportional relation, so that the lower limit of flow measurement capable of ensuring accuracy can generally reach only 30% of the full-scale flow value, and the application range of the differential pressure type flow is greatly limited.
In addition, the differential pressure transmitter transmits a differential pressure value to the flow integrating instrument by adopting a 4-20 mA current signal, and fluid flow is obtained through some operations, wherein in the process, one digital-to-analog conversion and one analog-to-digital conversion are involved, and in the two conversion processes, the loss of metering precision is inevitably brought, and the measuring precision is also seriously influenced.
In order to solve the technical problems, the prior art mostly adopts methods of automatic or manual switching of large and small pipes, double-pore plate switching, high and low range double-diaphragm capsule transformer, signal amplification of low output of a transmitter, high-precision vortex shedding flowmeter and the like. However, with these methods, there are one or more problems such as complicated structure, excessive cost, inconvenient operation, poor reliability, difficult maintenance, non-ideal expansion degree of the measuring range ratio (ratio of the full range of the differential pressure type flowmeter to the minimum flow rate capable of guaranteeing the measuring accuracy), no real improvement of the accuracy, etc., and the measuring difficulty of the user cannot be solved well.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-precision wide-range integrated differential pressure type flow measuring device.
The invention provides a high-precision wide-range integrated differential pressure type flow measuring device, which is characterized by comprising
An integrated throttling device for mounting on the fluid conduit under test;
The integrated throttling device comprises a throttling device, a pressure guiding device and a pipeline main body which are integrally formed, wherein two ends of the pipeline main body are respectively arranged on a tested fluid pipeline in a detachable mode, and the throttling device is arranged in the pipeline main body and used for throttling fluid;
A pressure detecting device for detecting the pressure of the fluid flowing through the integrated throttle device, the pressure detecting device being provided on the pipe body;
A temperature detecting device for detecting the temperature of the fluid flowing through the integrated throttle device, the temperature detecting device being provided on the pipe body;
A high-range flow rate measuring device for measuring the flow rate of the fluid and having a large range, the high-range flow rate measuring device being provided on one side of the pipe body;
The low-range flow measuring device is used for measuring the flow of the fluid and has a smaller range, the range of the low-range flow measuring device is smaller than that of the high-range flow measuring device, and the low-range flow measuring device is arranged on the other side of the pipeline main body and is positioned on the plumb face which is perpendicular to the axis of the pipeline main body with the high-range flow measuring device;
the flow integrating instrument is respectively in communication connection with the pressure detection device, the temperature detection device, the high-range flow measurement device and the low-range flow measurement device;
The flow integrating instrument can automatically switch the flow value measured by the high-range flow measuring device and the flow value measured by the low-range flow measuring device according to the actually measured flow value, and performs compensation calculation and display on the switched flow value.
In a preferred embodiment of the invention, the temperature sensing means comprises a temperature probe for sensing the temperature of the fluid flowing through the pipe body, the temperature probe being in communication with a temperature transmitter in communication with a flow totalizer.
In a preferred embodiment of the invention, the pressure sensing means comprises a pressure conduit for deriving the pressure of the fluid flowing through the conduit body, the pressure conduit being in communication with a pressure transmitter in communication with a flow totalizer.
In a preferred embodiment of the present invention, the high range flow measurement device includes a first pressure guiding pipe having a high pressure sampling channel and a low pressure sampling channel inside, one end of the first pressure guiding pipe is disposed on one side of the pipe body, the high pressure sampling port of the high pressure sampling channel is located at the high pressure of the fluid, the low pressure sampling port of the low pressure sampling channel is located at the low pressure of the fluid, the first pressure guiding pipe is connected with a high range differential pressure transmitter for measuring the high low pressure difference of the fluid through a first transition pipe, a first condensation cylinder is disposed between the first pressure guiding pipe and the first transition pipe, a first third valve group is disposed at the tail of the first transition pipe, and the high range differential pressure transmitter is in communication connection with the flow integrator.
In a preferred embodiment of the present invention, the low range flow measurement device includes a second pressure guiding pipe having a high pressure sampling channel and a low pressure sampling channel inside, one end of the second pressure guiding pipe is disposed on the other side of the pipe body, the high pressure sampling port of the high pressure sampling channel is located at the high pressure of the fluid, the low pressure sampling port of the low pressure sampling channel is located at the low pressure of the fluid, the second pressure guiding pipe is connected with a low range differential pressure transmitter for measuring the high low range differential pressure of the fluid through a second transition pipe, a second condensation cylinder is disposed between the second pressure guiding pipe and the second transition pipe, a second third valve group is disposed at the tail of the second transition pipe, and the low range differential pressure transmitter is in communication connection with the flow integrator.
In a preferred embodiment of the present invention, the flow integrating instrument includes an MCU processing unit, a power supply unit, a Hart conversion unit, an output unit, a display/touch unit, and a communication unit, where the MCU processing unit is communicatively connected to the Hart conversion unit, the output unit, the display/touch unit, and the communication unit, and the power supply unit is electrically connected to the MCU processing unit and the Hart conversion unit, respectively.
In a preferred embodiment of the invention, flanges for connecting the fluid conduit under test are provided at both ends of the conduit body, respectively.
Compared with the prior art, the invention has the following beneficial effects:
1. the precision is high: hart communication is adopted between each transmitter and the flow integrating instrument, so that precision loss during mutual conversion of analog signals and digital signals is avoided. The traditional temperature and pressure real-time compensation is realized, and meanwhile, the real-time compensation of the outflow coefficient and the expansibility coefficient is also realized. The accuracy and reliability of the measurement data are ensured.
2. The measuring range is wider: by adding a low-range differential pressure transmitter and combining Hart communication and a plurality of compensation operations, the range ratio can be enlarged to 100:1 or even more.
3. The installation is simple: the throttling device, the pressure transmitter and the pipeline main body are integrally designed, and the flange is only required to be connected to the tested fluid pipeline during installation.
4. The maintenance is convenient: by adopting Hart communication, the flow integrating instrument can read signals such as flow and pressure of the transmitters and also can read real-time working conditions and basic instrument information of each transmitter. The flow integrating instrument can upload the information to the upper computer through the communication unit, so that an operator can analyze the working condition period and state transition of the measuring instrument conveniently.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
Fig. 1 is a control schematic of the present invention.
Fig. 2 is a schematic diagram of the structure of the integrated throttle device, the temperature detection device and the high-range flow measurement device after installation.
Fig. 3 is a schematic diagram of the structure of the present invention after the Hart bus connection is adopted.
Fig. 4 is a control schematic diagram of the flow totalizer of the present invention.
FIG. 5 is a flow chart of the flow totalizer program of the present invention.
Fig. 6 is a schematic diagram of the high and low range switching principle of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Referring to fig. 1-2, a high-precision wide-range integrated differential pressure type flow measuring device is provided, which comprises an integrated throttling device, a pressure detecting device 100, a temperature detecting device 200, a high-range flow measuring device 300, a low-range flow measuring device 400 and a flow integrating instrument 500.
The integrated throttling device 100 is used for being installed on a tested fluid pipeline, the integrated throttling device 100 comprises a throttling device, a pressure guiding device and a pipeline main body 600 which are integrally formed, two ends of the pipeline main body 600 are respectively detached and arranged on the tested fluid pipeline, and the throttling device is arranged in the pipeline main body 600 and used for throttling fluid.
The flanges for connecting the tested fluid pipeline are respectively arranged at the two ends of the pipeline main body 600, and the pipeline main body can be conveniently mounted on the tested fluid pipeline by only matching the selected bolts with the threaded holes through the through holes formed in the circumferential direction of the flanges during mounting.
The pressure detecting device 100 is used for detecting the pressure of the fluid flowing through the integrated throttling device, the pressure detecting device is arranged on the pipeline main body, the pressure detecting device 100 comprises a pressure guiding pipe for guiding the pressure of the fluid flowing through the pipeline main body 600, the pressure guiding pipe is in communication connection with the pressure transmitter 110, and the pressure transmitter 110 is in communication connection with the flow integrating instrument 500.
The temperature detection device 200 is used for detecting the temperature of the fluid flowing through the integrated throttling device, the temperature detection device is arranged on the pipeline main body 600, the temperature detection device 200 comprises a temperature probe used for detecting the temperature of the fluid flowing through the pipeline main body 600, the temperature probe is in communication connection with the temperature transmitter 210, the temperature transmitter 210 is in communication connection with the flow integrating instrument 500, a temperature signal detected by the temperature probe can be sent to the flow integrating instrument 500 through the temperature transmitter 210, the temperature signal can be displayed at the upper part of the flow integrating instrument, and temperature and pressure real-time compensation can be realized by adopting the structure.
The high range flow measurement device 300 is used for measuring the flow of the fluid, the range is larger, the high range flow measurement device 300 is arranged on one side of the pipeline main body 600, the high range flow measurement device 300 comprises a first pressure guide pipe 310 internally provided with a high pressure taking channel and a low pressure taking channel, one end of the first pressure guide pipe 310 is arranged on one side of the pipeline main body 600, a high pressure taking port of the high pressure taking channel is positioned at the high pressure of the fluid, and a low pressure taking port of the low pressure taking channel is positioned at the low pressure of the fluid.
The first impulse pipe 310 is connected with a high-range differential pressure transmitter 330 for measuring the high-low differential pressure of fluid through a first transition pipe 320, a first condensation cylinder 340 is arranged between the first impulse pipe 310 and the first transition pipe 320, a first third valve bank 350 is arranged at the tail part of the first transition pipe 310, and the high-range differential pressure transmitter 330 is in communication connection with a flow integrating instrument 500.
The low-range flow measuring device 400 is used for measuring the flow of the fluid, the range is smaller, the range of the low-range flow measuring device 400 is smaller than that of the high-range flow measuring device, and the low-range flow measuring device 400 is arranged on the other side of the pipeline main body 600 and is positioned on the plumb face which is perpendicular to the axis of the pipeline main body 600 with the high-range flow measuring device 300.
The low range flow measuring device 400 includes a second pressure guide pipe 410 having a high pressure taking passage and a low pressure taking passage inside, one end of the second pressure guide pipe 410 is disposed on the other side of the pipe body 600, and the high pressure taking port of the high pressure taking passage is located at a high pressure of the fluid while the low pressure taking port of the low pressure taking passage is located at a low pressure of the fluid.
The second impulse pipe 410 is connected with a low-range differential pressure transmitter 430 for measuring the high-low level differential pressure of the fluid through a second transition pipe 420, a second condensing cylinder 440 is arranged between the second impulse pipe 410 and the second transition pipe 420, a second third valve group 450 is arranged at the tail part of the second transition pipe 420, and the low-range differential pressure transmitter 430 is in communication connection with a flow integrating instrument 500.
The low-range differential pressure transmitter 430 and the high-range differential pressure transmitter 330 are arranged on the pipeline main body 600 through the bracket 700, so that the stability performance between the low-range differential pressure transmitter 430 and the high-range differential pressure transmitter 330 and the pipeline main body 600 is effectively improved, and the measurement accuracy of the device is further improved.
As described with reference to fig. 3, the high and low range differential pressure transmitters 330, 430, the pressure transmitter 110 and the temperature transmitter 210 are all hung on the Hart bus, the addresses of these devices cannot be repeated, and the flow totalizer 500 sequentially reads the digital output signals of the transmitters in a polling manner and performs an operation process.
Referring to fig. 4, the flow integrating instrument 500 is communicatively connected to the pressure detecting device 100, the temperature detecting device 200, the high-range flow measuring device 300, and the low-range flow measuring device 400, respectively, and the flow integrating instrument 500 can automatically switch the flow value measured by the high-range flow measuring device 300 and the flow value measured by the low-range flow measuring device 400 according to the actually measured flow values, and display the switched flow values.
The flow integrating instrument 500 comprises an MCU processing unit 510, a power supply unit 520, a Hart conversion unit 530, an output unit 540, a display/touch control unit 550 and a communication unit 560, wherein the MCU processing unit 510 is respectively in communication connection with the Hart conversion unit 530, the output unit 540, the display/touch control unit 550 and the communication unit 560, and the power supply unit 520 is respectively and electrically connected with the MCU processing unit 510 and the Hart conversion unit 530.
The power supply unit 520 comprises a battery 521 and a power panel 522, the battery 521 is electrically connected with the power panel 522, the power panel 522 is electrically connected with the MCU processing unit 510 and the Hart conversion unit 530 respectively, the power panel 522 can be connected with a 220V power supply, the MCU processing unit 510 can supply power to the pressure transmitter 110, the temperature transmitter 210, the high-range differential pressure transmitter 330 and the low-range differential pressure transmitter 430 through connectors 531 connected with the power panel, and the power is supplied through a +24V direct current power supply.
The MCU processing unit 510 sequentially reads the digital output signals of the high and low range differential pressure transmitters 330 and 430, the pressure transmitter 110 and the temperature transmitter 210 by adopting a polling mode, and performs an operation process on the flow according to the signals. The Hart conversion unit 530 mainly converts the 485 signal output by the MCU processing unit 510 into a Hart signal identifiable by the transmitter, and converts the Hart signal output by the transmitter into a 485 signal processable by the MCU processing unit.
Referring to fig. 5, the ranges, flow switching points, switching windows, and other relevant parameters of the high and low range differential pressure transmitters are set in advance in the flow totalizer 500. When the flow integrating instrument 500 is powered on or reset, a series of initialization settings are firstly performed, then signals such as differential pressure, temperature and the like are started to be polled and read, instantaneous flow is calculated according to the signals and parameters set in advance, temperature and pressure, outflow coefficient, expansibility coefficient and the like are compensated, actual instantaneous flow Q is obtained, and flow accumulation is performed at the same time. And then, the flow integrating instrument compares the current instantaneous flow Q with the set flow switching point to judge whether the range needs to be switched. After the range switching judgment is completed, the flow integrating instrument displays the current information of instantaneous flow, accumulated flow, temperature, pressure and the like through the display unit, and then the next cycle is started after the key processing, communication processing and the like are performed.
Referring to fig. 6, the range from the leftmost 0 to the low range 100% is the range of the low range differential pressure transmitter. The low-range differential pressure transmitter is additionally arranged, so that the lower limit of flow measurement can be moved from the original lower limit point of high-range measurement to the lower limit point of low-range measurement. Therefore, the Hart communication transmission signal and the real-time compensation of the flow are adopted, so that the range ratio can be further enlarged to 100:1 or more.
With both high and low range differential pressure transmitters 330, 430, care should be taken in the range selection of the high and low range differential pressure transmitters 330, 430, as well as the setting of the switching point and the switching window. To prevent span jumps around the switching point, a switching window (the segment between the falling switching point to the rising switching point) must be set. Too narrow a switching window selection does not function to prevent hopping, and if too wide a selection tends to reduce the turndown ratio. Since the switching window must be guaranteed to be within the effective measuring range of the high and low ranges, i.e. must be chosen between the lower limit of the high range measurement and 100% of the low range measurement.
In each flow calculation, the flow integrating instrument 500 performs flow calculation according to the currently selected measurement range by adopting the differential pressure value of the corresponding differential pressure transmitter, performs compensation calculation to obtain an instantaneous flow, and then determines whether the next flow calculation adopts a high measurement range or a low measurement range by comparing the instantaneous flow with a preset flow switching point, which is called high-low measurement range switching.
In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (5)
1. The utility model provides a high accuracy wide range integration differential pressure formula flow measurement device which characterized in that includes
An integrated throttling device for mounting on the fluid conduit under test;
The integrated throttling device comprises a throttling device, a pressure guiding device and a pipeline main body which are integrally formed, wherein two ends of the pipeline main body are respectively and detachably arranged on a tested fluid pipeline, and the throttling device is arranged in the pipeline main body and used for throttling a fluid;
A pressure detecting device for detecting the pressure of the fluid flowing through the integrated throttle device, the pressure detecting device being provided on the pipe body;
A temperature detecting device for detecting the temperature of the fluid flowing through the integrated throttle device, the temperature detecting device being provided on the pipe body;
A high-range flow rate measuring device for measuring the flow rate of the fluid and having a large range, the high-range flow rate measuring device being provided on one side of the pipe body;
The low-range flow measuring device is used for measuring the flow of the fluid and has a smaller range, the range of the low-range flow measuring device is smaller than that of the high-range flow measuring device, and the low-range flow measuring device is arranged on the other side of the pipeline main body and is positioned on the plumb face which is perpendicular to the axis of the pipeline main body with the high-range flow measuring device;
the flow integrating instrument is respectively in communication connection with the pressure detection device, the temperature detection device, the high-range flow measurement device and the low-range flow measurement device;
The flow integrating instrument can automatically switch the flow value measured by the high-range flow measuring device and the flow value measured by the low-range flow measuring device according to the actually measured flow value, and the switched flow value is compensated and calculated and displayed;
the low-range flow measuring device comprises a second pressure guiding pipe with a high-pressure taking channel and a low-pressure taking channel arranged inside, one end of the second pressure guiding pipe is arranged on the other side of the pipeline main body, and the high pressure taking port of the high pressure taking channel is positioned at the high pressure of the fluid, and the low pressure taking port of the low pressure taking channel is positioned at the low pressure of the fluid, the second pressure guiding pipe is connected with a low-range differential pressure transmitter for measuring high-low differential pressure of fluid through a second transition pipe, a second condensation cylinder is arranged between the second pressure guiding pipe and the second transition pipe, a second three-valve group is arranged at the tail part of the second transition pipe, and the low-range differential pressure transmitter is in communication connection with a flow integrating instrument;
The flow integrating instrument comprises an MCU processing unit, a power supply unit, a Hart conversion unit, an output unit, a display/touch control unit and a communication unit, wherein the MCU processing unit is respectively in communication connection with the Hart conversion unit, the output unit, the display/touch control unit and the communication unit, and the power supply unit is respectively and electrically connected with the MCU processing unit and the Hart conversion unit.
2. The high-precision wide-range integrated differential pressure type flow measurement device according to claim 1, wherein the temperature detection device comprises a temperature probe for detecting the temperature of the fluid flowing through the pipeline main body, the temperature probe is in communication connection with a temperature transmitter, and the temperature transmitter is in communication connection with a flow integrating instrument.
3. The high-precision wide-range integrated differential pressure type flow measuring device according to claim 1, wherein the pressure detecting device comprises a pressure guiding pipe for guiding out the pressure of the fluid flowing through the pipeline main body, the pressure guiding pipe is in communication connection with a pressure transmitter, and the pressure transmitter is in communication connection with a flow integrating instrument.
4. The high-precision wide-range integrated differential pressure type flow measuring device according to claim 1, wherein the high-range flow measuring device comprises a first impulse pipe provided with a high-pressure taking channel and a low-pressure taking channel inside, one end of the first impulse pipe is arranged on one side of a pipeline main body, and a high-pressure taking port of the high-pressure taking channel is positioned at the high pressure of fluid, simultaneously, a low-pressure taking port of the low-pressure taking channel is positioned at the low pressure of the fluid, the first pressure guiding pipe is connected with a high-range differential pressure transmitter for measuring the high-low pressure difference of the fluid through a first transition pipe, a first condensing cylinder is arranged between the first pressure guiding pipe and the first transition pipe, a first three-valve group is arranged at the tail part of the first transition pipe, and the high-range differential pressure transmitter is in communication connection with a flow integrating instrument.
5. The high-precision wide-range integrated differential pressure type flow measuring device according to claim 1, wherein flanges for connecting a fluid pipeline to be measured are respectively arranged at two ends of the pipeline main body.
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| CN201910621518.XA CN110319891B (en) | 2019-07-10 | 2019-07-10 | High-precision wide-range integrated differential pressure type flow measuring device |
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| CN201910621518.XA CN110319891B (en) | 2019-07-10 | 2019-07-10 | High-precision wide-range integrated differential pressure type flow measuring device |
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| CN110319891B true CN110319891B (en) | 2024-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111006727B (en) * | 2019-12-31 | 2024-06-25 | 姜春林 | Elastic variable cross-section device |
| CN111896770A (en) * | 2020-07-16 | 2020-11-06 | 中国船舶重工集团公司第七0七研究所九江分部 | Processing circuit suitable for measuring flow velocity based on differential pressure principle |
| CN112504547A (en) * | 2020-11-25 | 2021-03-16 | 成都凯天电子股份有限公司 | High-precision dynamic pressure measuring method and system with long-term stability |
| CN114964393B (en) * | 2022-07-27 | 2022-10-21 | 常州艾肯智造科技有限公司 | Steam flowmeter with air pressure compensation metering |
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