CN210689729U - High-precision wide-range integrated differential pressure type flow measuring device - Google Patents
High-precision wide-range integrated differential pressure type flow measuring device Download PDFInfo
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Abstract
The utility model provides a high accuracy wide range integration differential pressure type flow measuring device, including integration throttling arrangement, pressure measurement, temperature-detecting device, high range flow measuring device, low range flow measuring device and flow totalizer, integration throttling arrangement includes the integrated throttle device of shaping design, leads pressure equipment and pipeline main part, flow totalizer respectively with pressure measurement, temperature-detecting device, high range flow measuring device and low range flow measuring device communication connection; the flow totalizer 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 perform compensation calculation and display on the switched flow value. The device has the advantages of high measurement precision, wide measurement range, convenience in installation, simplicity in operation, convenience in maintenance and the like, and brings great convenience to the measurement work of the fluid flow.
Description
Technical Field
The utility model relates to a flow measurement technical field specifically, relates to a high accuracy wide range integration differential pressure type flow measuring device.
Background
A differential pressure type flow meter is a meter that measures a flow rate by a differential pressure generated by a throttling device installed in a pipe, known pipe dimensions, and fluid conditions. The device 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.
At present, most of differential pressure type flow meters for measuring flow rate have low measurement accuracy, for example, chinese patent CN207963969U discloses a flow meter, which includes: the system comprises a wedge-shaped flow sensor, a differential pressure transmitter and a flow integrating instrument; the wedge flow sensor includes: the device comprises a measuring pipe, a flange plate, an upstream pressure taking port, a downstream pressure taking port, an upstream pressure guide pipe, a downstream pressure guide pipe, a three-valve group and a wedge-shaped body fixed on the inner wall of the measuring pipe; the top angle of the wedge-shaped body is smooth, the top angle of the wedge-shaped body faces downwards, and the structure is favorable for the liquid or viscous liquid containing suspended particles and dirty media to pass through smoothly; and the inner wall of the measuring pipe is also provided with a temperature sensor.
It can be seen from the above-mentioned published documents that most of the existing differential pressure flowmeters are composed of a single differential pressure transmitter and a throttling device, and the differential pressure flowmeter adopting such a structure has a serious disadvantage that the flow rate and the evolution of the differential pressure are in a direct proportion, so that the lower limit of the flow rate which can ensure the accuracy can only reach 30% of the full-scale flow rate value, which greatly limits the application range of the differential pressure flow rate.
In addition, the differential pressure transmitter adopts a 4-20 mA current signal to transmit a differential pressure value to the flow integrating instrument, and then fluid flow is obtained through some operations.
In order to solve the technical problems in the prior art, methods such as automatic or manual switching of large and small pipes, switching of double-orifice plates, adoption of high-low range double-diaphragm-box transformers, signal amplification of low output of a transmitter, adoption of a high-precision vortex shedding flowmeter and the like are mostly adopted. However, with the methods, there are one or more problems such as complex structure, too high cost, inconvenient operation, poor reliability, difficult maintenance, unsatisfactory range ratio (ratio of full range of the differential pressure type flowmeter to minimum flow rate capable of ensuring measurement accuracy), and unrealistic improvement of accuracy, and the measurement problem of the user cannot be solved well.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model aims at providing a high accuracy wide range integration differential pressure type flow measuring device.
According to the utility model provides a pair of high accuracy wide range integration differential pressure type flow measuring device, a serial communication port, include
An integrated throttle device for mounting on the measured fluid pipeline;
the integrated throttling device comprises a throttling device, a pressure guide device and a pipeline main body which are integrally formed, wherein two ends of the pipeline main body are respectively detachably arranged on a fluid pipeline to be tested, and the throttling device is arranged in the pipeline main body and is used for throttling fluid;
the pressure detection device is used for detecting the pressure of the fluid flowing through the integrated throttling device and is arranged on the pipeline main body;
the temperature detection device is used for detecting the temperature of the fluid flowing through the integrated throttling device and is arranged on the pipeline main body;
a high-range flow rate measuring device having a large range for measuring a flow rate of a fluid, the high-range flow rate measuring device being provided on one side of the pipe main body;
the low-range flow measuring device is used for measuring the flow of fluid and has a small 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 same plumb bob surface which is perpendicular to the axis of the pipeline main body as the high-range flow measuring device;
the flow totalizer 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 totalizer 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 perform compensation calculation and display on the switched flow value.
In a preferred embodiment of the present invention, the temperature detecting device includes a temperature probe for detecting the temperature of the fluid flowing through the pipe main body, the temperature probe is in communication connection with a temperature transmitter, and the temperature transmitter is in communication connection with the flow totalizer.
In a preferred embodiment of the present invention, the pressure detecting device includes a pressure pipe for guiding out the pressure of the fluid flowing through the pipe main body, the pressure pipe is in communication connection with the pressure transmitter, and the pressure transmitter is in communication connection with the flow totalizer.
The utility model discloses a preferred embodiment, high range flow measuring device is including the inside first connecting pipe that is equipped with high pressure and gets pressure passageway and low pressure and get pressure passageway, the one end setting of first connecting pipe is on one side of pipeline main part, and makes the high pressure that the passageway was got to high pressure get the pressure mouth and be located fluidic high pressure department, makes the low pressure that the passageway was got to low pressure simultaneously and gets pressure mouth and be located fluidic low pressure department, first connecting pipe is connected through first transition pipe and the high range differential pressure transmitter that is used for measuring fluid high-low level differential pressure be equipped with first condenser pipe between first connecting pipe and the first transition pipe the afterbody of first transition pipe is equipped with first three valves, high range differential pressure transmitter and flow integrating instrument communication connection.
The utility model discloses a preferred embodiment, low-range flow measuring device is including the inside second pressure pipe that is equipped with high pressure and gets pressure passageway and low pressure and get pressure passageway, the one end setting of second pressure pipe is on the opposite side of pipeline main part, and makes the high pressure of high pressure and get pressure passageway get the pressure mouth and be located fluidic high pressure department, makes the low pressure of low pressure and get pressure passageway simultaneously and get the pressure mouth and be located fluidic low pressure department, the second pressure pipe is connected through second transition pipe and the low-range differential pressure transmitter who is used for measuring fluid high-low bit pressure difference be equipped with the second condenser section of thick bamboo between second pressure pipe and the second transition pipe the afterbody of second transition pipe is equipped with third valves of second, low-range differential pressure transmitter is connected with flow integrating instrument communication.
The utility model discloses a preferred embodiment, the flow totalizer includes MCU processing unit, power supply unit, Hart converting unit, output unit, demonstration/touch-control unit and communication unit, MCU processing unit is connected with Hart converting unit, output unit, demonstration/touch-control unit and communication unit communication respectively, power supply unit is connected with MCU processing unit and Hart converting unit electricity respectively.
In a preferred embodiment of the present invention, flanges for connecting the measured fluid pipeline are respectively disposed at both ends of the pipeline main body.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the precision is high: hart communication is adopted between each transmitter and the flow integrating instrument, so that the precision loss caused by mutual conversion of analog signals and digital signals is avoided. The real-time compensation of the outflow coefficient and the expansibility coefficient is realized while the traditional real-time compensation of the temperature and the pressure is realized. The accuracy and reliability of the measurement data are ensured.
2. The measuring range is wider: by additionally arranging a low-range differential pressure transmitter and combining Hart communication and a plurality of compensation operations, the range ratio can be expanded to 100:1 or even more.
3. The installation is simple: the throttling device, the pressure transmitter and the pipeline main body are designed integrally, and only the flange is connected to the measured fluid pipeline during installation.
4. The maintenance is convenient: by adopting Hart communication, the flow integrating instrument can not only read signals such as flow, pressure and the like of the transmitters, but also read real-time working conditions and basic instrument information of each transmitter. The flow totalizer can upload the information to an upper computer through a communication unit, and an operator can conveniently analyze the working condition period and the state transition of the measuring instrument.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a control schematic diagram of the present invention.
Fig. 2 is the utility model discloses the structure schematic diagram after integrated throttling arrangement and temperature-detecting device and high range flow measuring device installed.
Fig. 3 is the utility model discloses a structural schematic behind the Hart bus connection.
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 the following embodiments. 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 various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention. These all belong to the protection scope of the present invention.
Referring to fig. 1-2, a high-precision wide-range integrated differential pressure type flow measuring device is shown, 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 meter 500.
The integrated throttling device 100 is used for being installed on a measured fluid pipeline, the integrated throttling device 100 comprises a throttling device, a pressure guide device and a pipeline main body 600 which are integrally formed, the two ends of the pipeline main body 600 are respectively detached and arranged on the measured fluid pipeline, and the throttling device is arranged inside the pipeline main body 600 and used for throttling fluid.
The flanges used for connecting the tested fluid pipeline are arranged at the two ends of the pipeline main body 600 respectively, the bolts only need to be selected for use during installation to penetrate through holes arranged in the circumferential direction of the flanges and be matched with threaded holes, the pipeline main body can be conveniently installed on the tested fluid pipeline, installation efficiency of the pipeline main body is effectively improved by adopting the structure and facilitating installation.
The pressure detection device 100 is used for detecting the pressure of the fluid flowing through the integrated throttling device, the pressure detection device is arranged on the pipeline main body, the pressure detection device 100 comprises a pressure guide pipe used for guiding the pressure of the fluid flowing through the pipeline main body 600, the pressure guide 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.
Temperature-detecting device 200 is used for carrying out temperature detection to the fluid that flows through integration throttling arrangement, temperature-detecting device sets up on pipeline main part 600, temperature-detecting device 200 is including the temperature probe that is used for detecting the temperature of the fluid that flows through pipeline main part 600, temperature probe and temperature transmitter 210 communication connection, temperature transmitter 210 and flow integrating instrument 500 communication connection, and can send the temperature signal that temperature probe detected to flow integrating instrument 500 on through temperature transmitter 210, and can show in its upper portion, adopt above-mentioned structure can realize temperature and pressure real-time compensation.
High-range flow measuring device 300 is used for measuring the flow of fluid and the range is great, high-range flow measuring device 300 sets up on one side of pipeline main part 600, high-range flow measuring device 300 includes that inside is equipped with the high pressure and gets pressure the first pressure pipe 310 of passageway and low pressure and get pressure the passageway, the one end setting of first pressure pipe 310 is on one side of pipeline main part 600, and makes the high pressure of high pressure and get pressure the passageway and get pressure the mouth and be located the high pressure department of fluid, makes the low pressure of low pressure and get pressure the mouth and be located the low pressure department of fluid simultaneously.
The first pressure guiding pipe 310 is connected with a high range differential pressure transmitter 330 for measuring the high-low differential pressure of the fluid through a first transition pipe 320, a first condensing cylinder 340 is arranged between the first pressure guiding pipe 310 and the first transition pipe 320, a first three-valve set 350 is arranged at the tail of the first transition pipe 310, and the high range differential pressure transmitter 330 is in communication connection with the flow integrating instrument 500.
The low-range flow rate measuring device 400 is used for measuring the flow rate of fluid and has a small range, the low-range flow rate measuring device 400 has a smaller range than the high-range flow rate measuring device, the low-range flow rate measuring device 400 is disposed on the other side of the pipe body 600 and is located on the same plumb surface perpendicular to the axis of the pipe body 600 as the high-range flow rate measuring device 300.
The low-range flow rate measuring device 400 includes a second pressure pipe 410 having a high-pressure taking channel and a low-pressure taking channel inside, one end of the second pressure pipe 410 is disposed on the other side of the pipe body 600, and a high-pressure taking port of the high-pressure taking channel is located at a high-pressure portion of the fluid, while a low-pressure taking port of the low-pressure taking channel is located at a low-pressure portion of the fluid.
The second pressure pipe 410 is connected with a low-range differential pressure transmitter 430 for measuring fluid high-low level differential pressure through a second transition pipe 420, a second condensation cylinder 440 is arranged between the second pressure pipe 410 and the second transition pipe 420, a second third valve group 450 is arranged at the tail of the second transition pipe 420, and the low-range differential pressure transmitter 430 is in communication connection with the flow integrator 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 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.
Referring to fig. 3, the high and low range differential pressure transmitters 330 and 430, the pressure transmitter 110 and the temperature transmitter 210 are all hung on a Hart bus, the addresses of the devices cannot be repeated, and the flow totalizer 500 sequentially reads the digital output signals from the transmitters in a polling manner and performs operation processing.
Referring to fig. 4, the flow totalizer 500 is 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 in a communication manner, and the flow totalizer 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 value and display the switched flow values.
The flow totalizer 500 comprises an MCU processing unit 510, a power supply unit 520, a Hart conversion unit 530, an output unit 540, a display/touch 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 unit 550 and the communication unit 560, and the power supply unit 520 is respectively 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 supply board 522, the battery 521 is electrically connected with the power supply board 522, the power supply board 522 is electrically connected with the MCU processing unit 510 and the Hart conversion unit 530 respectively, the power supply board 522 can also be connected with a 220V power supply, the MCU processing unit 510 can supply power for the pressure transmitter 110, the temperature transmitter 210, the high-range differential pressure transmitter 330 and the low-range differential pressure transmitter 430 through a connector 531 connected with the MCU processing unit, and supplies power 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 polling, and performs arithmetic processing on the flow rate according to these signals. The Hart conversion unit 530 mainly converts the 485 signal output by the MCU processing unit 510 into a Hart signal recognizable 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 of the high and low range differential pressure transmitters, the flow switching points, the switching windows, and other related parameters are preset in the flow totalizer 500. After the flow totalizer 500 is powered on or reset, a series of initialization settings are firstly carried out, then signals such as differential pressure, temperature and the like are started to be read in a polling mode, instantaneous flow is calculated according to the signals and preset parameters, compensation such as temperature pressure, outflow coefficient, expansibility coefficient and the like is carried out on the instantaneous flow, actual instantaneous flow Q is obtained, and meanwhile flow accumulation is carried out. Then, the flow totalizer 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 enters the next cycle after key processing, communication processing and the like are performed.
Referring to fig. 6, the range from 0 on the leftmost side 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 shifted to the left from the original lower limit point of high-range measurement to the lower limit point of low-range measurement. Therefore, by adopting Hart communication transmission signals and real-time compensation of flow, the range ratio can be further expanded to 100:1 or even more.
With the high and low range differential pressure transmitters 330, 430, it is noted that the ranges of the high and low range differential pressure transmitters 330, 430 are selected, as well as the settings of the switch points and switch windows. To prevent span jump around the switching point, a switching window (the section between the falling switching point to the rising switching point) must be set. If the switching window selection is too narrow, it does not serve to prevent hopping, and if the selection is too wide, it tends to reduce the span ratio. Because it must be ensured that the switching window is within the effective measurement range of the high and low range, i.e. it must be chosen between the low limit of the high range measurement and 100% of the low range.
During each flow calculation, the flow totalizer 500 performs flow calculation according to the currently selected range by using the differential pressure value of the corresponding differential pressure transmitter, performs compensation calculation to obtain the instantaneous flow, and then determines whether the next flow calculation adopts a high range or a low range by comparing the instantaneous flow with a preset flow switching point, which is called high-low range switching.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of the specific embodiments of the invention has been presented. It is to be understood that the present invention is not limited to the specific 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 departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (7)
1. A high-precision wide-range integrated differential pressure type flow measuring device is characterized by comprising
An integrated throttle device for mounting on the measured fluid pipeline;
the integrated throttling device comprises a throttling device, a pressure guide device and a pipeline main body which are integrally formed, wherein two ends of the pipeline main body are respectively detachably arranged on a fluid pipeline to be tested, and the throttling device is arranged in the pipeline main body and is used for throttling fluid;
the pressure detection device is used for detecting the pressure of the fluid flowing through the integrated throttling device and is arranged on the pipeline main body;
the temperature detection device is used for detecting the temperature of the fluid flowing through the integrated throttling device and is arranged on the pipeline main body;
a high-range flow rate measuring device having a large range for measuring a flow rate of a fluid, the high-range flow rate measuring device being provided on one side of the pipe main body;
the low-range flow measuring device is used for measuring the flow of fluid and has a small 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 same plumb bob surface which is perpendicular to the axis of the pipeline main body as the high-range flow measuring device;
the flow totalizer 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 totalizer 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 perform compensation calculation and display on the switched flow value.
2. A high accuracy wide range integrated differential pressure flow meter according to claim 1, wherein said temperature sensing means comprises a temperature probe for sensing the temperature of the fluid flowing through the conduit body, said temperature probe being communicatively connected to a temperature transmitter, said temperature transmitter being communicatively connected to the flow totalizer.
3. A high accuracy wide range integrated differential pressure type flow measuring device according to claim 1, wherein said pressure detecting means comprises a pressure pipe for guiding out the pressure of the fluid flowing through the main body of the pipe, said pressure pipe is connected to a pressure transmitter in communication, and said pressure transmitter is connected to a flow totalizer in communication.
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 pressure guiding pipe internally provided with a high-pressure taking channel and a low-pressure taking channel, one end of the first pressure guiding pipe is arranged on one side of the pipeline main body, a high-pressure taking port of the high-pressure taking channel is located at a high pressure position of the fluid, a low-pressure taking port of the low-pressure taking channel is located at a low pressure position of the fluid, the first pressure guiding pipe is connected with a high-range differential pressure transmitter for measuring the high-low differential pressure of the fluid through a first transition pipe, a first condensation cylinder is arranged between the first pressure guiding pipe and the first transition pipe, a first three-valve set is arranged at the tail part of the first transition pipe, and the high-range differential pressure transmitter is in communication connection with the flow integrating meter.
5. The high-precision wide-range integrated differential pressure type flow measuring device according to claim 1, wherein the low-range flow measuring device comprises a second pressure guiding pipe internally provided with a high-pressure taking channel and a low-pressure taking channel, one end of the second pressure guiding pipe is arranged on the other side of the pipeline main body, a high-pressure taking port of the high-pressure taking channel is located at a high-pressure part of the fluid, a low-pressure taking port of the low-pressure taking channel is located at a low-pressure part of the fluid, the second pressure guiding pipe is connected with a low-range differential pressure transmitter for measuring the high-low differential pressure of the 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 set is arranged at the tail part of the second transition pipe, and the low-range differential pressure transmitter is in communication connection with the flow integrator.
6. The high-precision wide-range integrated differential pressure type flow measuring device according to claim 1, wherein the flow totalizer comprises an MCU processing unit, a power supply unit, a Hart conversion unit, an output unit, a display/touch unit and a communication unit, the MCU processing unit is respectively in communication connection with the Hart conversion unit, the output unit, the display/touch unit and the communication unit, and the power supply unit is respectively electrically connected with the MCU processing unit and the Hart conversion unit.
7. The high-precision wide-range integrated differential pressure type flow measuring device according to claim 1, wherein flanges for connecting to a measured fluid pipeline are respectively arranged at two ends of the pipeline main body.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319891A (en) * | 2019-07-10 | 2019-10-11 | 上海五零盛同信息科技有限公司 | A kind of high-precision wide-range integrated differential pressure type flow meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319891A (en) * | 2019-07-10 | 2019-10-11 | 上海五零盛同信息科技有限公司 | A kind of high-precision wide-range integrated differential pressure type flow meter |
| CN110319891B (en) * | 2019-07-10 | 2024-06-07 | 上海五零盛同信息科技有限公司 | High-precision wide-range integrated differential pressure type flow measuring device |
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