CN216116185U - Electromagnetic differential pressure type mass flowmeter - Google Patents
Electromagnetic differential pressure type mass flowmeter Download PDFInfo
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- CN216116185U CN216116185U CN202122884127.2U CN202122884127U CN216116185U CN 216116185 U CN216116185 U CN 216116185U CN 202122884127 U CN202122884127 U CN 202122884127U CN 216116185 U CN216116185 U CN 216116185U
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Abstract
The utility model relates to the technical field of flowmeters, in particular to an electromagnetic differential pressure type mass flowmeter, which comprises a sensor, an upstream pressure sampling pipe, a downstream pressure sampling pipe and a support frame, wherein the upstream pressure sampling pipe, the downstream pressure sampling pipe and the support frame are arranged on the sensor, the two pressure sampling pipes are connected with a converter through a differential pressure signal acquisition processing unit, and the electromagnetic differential pressure type mass flowmeter is characterized in that: the sensor comprises an upstream Venturi tube section and a downstream Venturi tube section, an electromagnetic flow sensor is arranged between the upstream Venturi tube section and the downstream Venturi tube section, and the electromagnetic flow sensor and the sealing gasket are connected through a fastening piece. Through the technical scheme, the mass flowmeter provided by the utility model has the advantages of simplified structure, high measurement accuracy, integrated design, simplicity and convenience in installation and operation and high cost performance, and meets the requirement of accurate measurement of the mass flow of the fluid of a user.
Description
Technical Field
The utility model relates to the technical field of flowmeters, in particular to an electromagnetic differential pressure type mass flowmeter.
Background
The fluids are various in types, different in physical properties, and various and changeable in-situ process parameters, such as temperature, pressure, conductive fluids with components changing at any time, and the like. Aiming at the characteristics of the fluid, meter manufacturers develop various mass flowmeters to adapt to the metering requirements of different occasions and media, but the application range of the mass flowmeters has certain limitation. When the electromagnetic flowmeter and the differential pressure flowmeter are used for measuring mass flow, the fluid operation density must be preset or a density measuring instrument is configured for measuring the density, so that the mass flow can be accurately measured in real time, the structure composition is complex, and the installation and debugging workload is large and tedious; the Coriolis mass flowmeter is not suitable for large-caliber mass flow based on the measurement principle, and has high acquisition cost, so far, the Coriolis mass flowmeter is basically a foreign brand in the market, and the domestic production rate is extremely low. Meanwhile, the large pipeline and small flow working condition frequently occurs on site, and the electromagnetic flowmeter with the same pipeline specification is used, so that the measuring accuracy of the instrument is seriously reduced and even false signals occur due to the fact that the flow velocity of pipeline fluid is very low and flow signals are extremely weak.
Based on the current situation of domestic market, along with society more and more attach importance and stricter to the measurement, the management and control of energy simultaneously, a mass flowmeter that structure is simplified, measurement accuracy is high, integrated design, installation easy and simple to handle, price/performance ratio are high is urgently needed in the market, satisfies the accurate measurement of user's fluid mass flow.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an electromagnetic differential pressure type mass flowmeter, which solves the problems in the prior art.
The utility model relates to an electromagnetic differential pressure type mass flowmeter, which comprises a sensor, an upstream pressure sampling pipe, a downstream pressure sampling pipe and a support frame, wherein the upstream pressure sampling pipe, the downstream pressure sampling pipe and the support frame are arranged on the sensor, the two pressure sampling pipes are connected with a converter through a differential pressure signal acquisition processing unit, and the electromagnetic differential pressure type mass flowmeter is characterized in that: the sensor comprises an upstream Venturi tube section and a downstream Venturi tube section, an electromagnetic flow sensor is arranged between the upstream Venturi tube section and the downstream Venturi tube section, and the electromagnetic flow sensor and the sealing gasket are connected through a fastening piece.
Preferably, the position of the upstream pressure tapping pipe is positioned in the upstream venturi tube section cylindrical section; the downstream pressure tapping pipe is positioned at the throat part of the upstream Venturi tube.
Preferably, the differential pressure signal acquisition and processing unit comprises a differential pressure transmitter, a three-valve group and a conversion joint which are sequentially connected from top to bottom, and the differential pressure transmitter is connected with the converter; the adapter is respectively connected with the upstream pressure sampling pipe and the downstream pressure sampling pipe.
The utility model has the beneficial effects that: the electromagnetic differential pressure type mass flowmeter is suitable for the trend that the society attaches more and more strict importance to energy metering management and control, meets the accurate measurement of fluid mass flow, is particularly suitable for the accurate measurement of conductive fluid mass flow with large fluid density change caused by unstable temperature and pressure and frequent component change, can complete the mass flow measurement work without independently configuring a density measuring instrument or a temperature pressure compensation device, and simultaneously realizes the accurate measurement of large-pipeline small-flow conductive fluid mass flow, fluid density, differential pressure, frequency and the like. The instrument has high measurement accuracy, stable and reliable work, high integration degree, compact structure, capability of displaying and outputting various data and convenient communication; the method is convenient for users to analyze data and improve the process, improves the production efficiency, reduces the cost and adapts to the social management and control requirements of energy resources.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the construction of the sensor of the present invention;
FIG. 3 is a schematic structural diagram of a differential pressure signal acquisition and processing unit according to the present invention;
FIG. 4 is a schematic view illustrating the operation of an electromagnetic flowmeter according to the present invention;
FIG. 5 is a schematic view illustrating the operation of a differential pressure type flowmeter (venturi type) according to the present invention;
fig. 6 is a schematic view illustrating the measurement principle of the electromagnetic differential pressure type mass flowmeter of the utility model.
In the drawings, the reference numbers: the device comprises a sensor 1, a sensor 11, an upstream Venturi tube section, a fastener 12, a sealing gasket 13, an electromagnetic flow sensor 14, a downstream Venturi tube section 15, an upstream pressure tapping pipe 2, a downstream pressure tapping pipe 3, a differential pressure signal acquisition processing unit 4, a differential pressure transmitter 41, a three-valve group 42, a conversion joint 43, a converter 5 and a support frame 6.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
As shown in fig. 1 to 6, the electromagnetic differential pressure type mass flowmeter of the present invention includes a sensor 1, and an upstream pressure sampling pipe 2, a downstream pressure sampling pipe 3 and a support frame 6 which are installed on the sensor 1, the two pressure sampling pipes are connected with a converter 5 through a differential pressure signal acquisition processing unit 4, and the electromagnetic differential pressure type mass flowmeter is characterized in that: the sensor 1 comprises an upstream venturi tube section 11 and a downstream venturi tube section, an electromagnetic flow sensor 14 is arranged between the upstream venturi tube section and the downstream venturi tube section, and the electromagnetic flow sensor and the downstream venturi tube section are connected through a fastener 12 and a sealing gasket 13.
Preferably, the position of the upstream pressure tapping pipe is positioned in the cylindrical section of the upstream Venturi pipe section 11; the downstream pressure tapping pipe is positioned at the throat part of the upstream Venturi tube.
Preferably, the differential pressure signal acquisition and processing unit 4 comprises a differential pressure transmitter 41, a three-valve group 42 and a conversion joint 43 which are sequentially connected from top to bottom, and the differential pressure transmitter 41 is connected with the converter 5; the adapter 43 is connected to the upstream pressure sampling pipe 2 and the downstream pressure sampling pipe 3 respectively.
The use principle is as follows:
1. electromagnetic flow meter measurement principle:
according to the faraday's law of electromagnetic induction, the conductor cuts magnetic lines of force when moving in a magnetic field, and an induced electromotive force is generated at both ends of the conductor, as shown in fig. 4. The direction of the electromotive force is determined by the right-hand rule. The flowing direction of the conductive fluid, the direction of the magnetic field and the direction of the induced electromotive force are mutually vertical, and the calculation formula is
UE＝κBDυ
In the formula of UE-an induced electromotive force; kappa-coefficient; b, magnetic induction intensity;
d, measuring the inner diameter of the pipe; v-mean fluid velocity
The volume flow equation of the electromagnetic flowmeter under working conditions is as follows:
after the conversion is simplified: qv ═ UE/K1
Qm＝Qvρ1
In the formula Qv，Qm-working condition volumetric flow and mass flow respectively; f is the output frequency;
K1-Meter factor; rho1-operating density.
The induced electromotive force generated by the fluid flowing through and cutting the magnetic force lines in the pipeline is in direct proportion to the flow, the induced electromotive force is detected by detection clicks, a detection signal is amplified and shaped by an amplifier and then is input into a converter, and the flow of the fluid is obtained through calculation of the converter.
The output signal of the electromagnetic flowmeter is not affected by the change of the physical property and the component of the fluid, and the meter coefficient is only related to the size of the pipeline, the magnetic field intensity and the like. However, when detecting mass flow, the meter needs to monitor both the volume flow and the density of the fluid, and the physical properties and components of the fluid have direct influence on the measurement result of the flow.
2. Differential pressure type flowmeter (venturi tube type) measurement principle:
when fluid filling the pipe passes through the throttling device in the pipe, the flow stream will form a local contraction at the throttling part (i.e. the illustrated throat part), so that the flow velocity is increased, the static pressure is reduced, and then a static pressure difference deltap (or differential pressure) is generated before and after the throttling part. The larger the flow velocity of the fluid, the larger the differential pressure fluid generated before and after the throttling element, so the flow rate of the fluid flowing through the throttling device can be measured by measuring the differential pressure, as shown in fig. 5.
Working condition volume flow equation of differential pressure type flowmeter (venturi tube type):
in the formula Qv: working condition volume flow; k2: coefficient of instrument, constant term
Δ P: differential pressure value (Δ P ═ P1-P2); rho1: operating Density
Epsilon: stream expansion coefficient (dimensionless) fluid epsilon is 1, gas/steam can be calculated
As can be seen from the above formula, the operating density has a direct influence on the accuracy of the measurement, and must be accurately provided or accurately measured, and the instrument can obtain an accurate mass flow value.
3. The measurement principle of the electromagnetic differential pressure type mass flowmeter is as follows:
the fluid simultaneously generates an induced electromotive force signal and a differential pressure delta P through an electromagnetic differential pressure type mass flowmeter sensor, the induced electromotive force signal is detected to obtain the working condition volume flow of the fluid, and the working condition volume density of the fluid can be calculated according to a flow calculation formula of a differential pressure type flowmeter (Venturi tube type), so that the mass flow of the fluid is obtained, as shown in figure 6.
Qm＝Qv·ρ1
In the sensor unit 1, the upstream Venturi tube section 11, the electromagnetic flowmeter sensor 14 and the downstream Venturi tube section 15 are reasonably selected according to medium physical property parameters, process parameters and the like, so that the measurement of the conductive fluid is met.
All parts of the sensor unit 1 are connected in a flange mode, and no movable part is arranged in each part.
The upstream pipe section in the sensor unit 1 selects a flange type Venturi pipe section 11 form, and comprises a front end flange, a rear end flange, an inlet cylindrical section, an inlet contraction section and a throat part, the structure is shown in figure 2, the throat part is a throttling piece, the size of the throat part and the specification and size of the electromagnetic flow sensor are determined according to the fluid flow, the stability and the strength of induced electromotive force signals and upstream and downstream differential pressure signals are ensured, and the electromagnetic flow sensor 14 and the differential pressure signal acquisition and processing unit 4 are favorable for acquiring and processing signals.
The upstream pressure sampling pipe 2 is positioned at the cylindrical section of the upstream Venturi tube section 11, and the collected upstream static pressure P1 is transmitted to the differential pressure signal collecting and processing unit 4.
The downstream pressure sampling pipe 3 is positioned at the throat part of the upstream venturi tube 11, and the collected throat part, namely the downstream static pressure P2 is transmitted to the differential pressure signal collection processing unit 4.
The differential pressure transmitter 41 is connected with the three valve groups 42 through valve group mounting screws, the sealing gasket is used for sealing, the adapter 43 is in threaded connection with the three valve groups, and the adapter 43 is in welded connection with the upstream pressure sampling pipe 2 and the downstream pressure sampling pipe 3.
Static pressure P1 and P2 in the upstream pressure sampling pipe 2 and the downstream pressure sampling pipe 3 are transmitted to a differential pressure transmitter 41 through a conversion joint 43 and a three-valve group 42, and the differential pressure transmitter 41 converts static pressure difference signals of the two into electric signals and then transmits the electric signals to a converter 5.
Electromagnetic flow sensor 14 adopts flange, fastener, seal gasket with upper reaches venturi section 11, low reaches venturi section to carry out sealing connection, gathers the response electromotive force signal, transmits converter 5.
The support frame 6 is used for installing the converter 5, and simultaneously contains a differential pressure signal wire output by the differential pressure signal acquisition and processing unit 4 and an electric signal cable output by the electromagnetic flow sensor 14.
The converter 5 receives the induced electromotive force signal of the electromagnetic flow sensor 14 and the differential pressure signal of the differential pressure signal acquisition processing unit 4, and performs the work of signal amplification, filtering, shaping, calculation and the like, and according to the measurement principle part of the electromagnetic differential pressure type mass flowmeter, the work of working condition volume calculation, operation density calculation, mass flow calculation, accumulated flow calculation and the like is performed, and the display, signal remote transmission and communication of various parameters are completed.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The utility model provides an electromagnetism differential pressure formula mass flowmeter, includes the sensor and installs the upper reaches on the sensor and get the pipe, the low reaches are got and are pressed pipe and support frame, and two are got and are pressed the pipe and pass through differential signal acquisition processing unit and be connected its characterized in that with the converter: the sensor comprises an upstream Venturi tube section and a downstream Venturi tube section, an electromagnetic flow sensor is arranged between the upstream Venturi tube section and the downstream Venturi tube section, and the electromagnetic flow sensor and the sealing gasket are connected through a fastening piece.
2. An electromagnetic differential pressure mass flowmeter according to claim 1, wherein said upstream pressure tapping pipe is located in the upstream venturi section cylindrical section; the downstream pressure tapping pipe is positioned at the throat part of the upstream Venturi tube.
3. The electromagnetic differential pressure type mass flowmeter of claim 2, wherein the differential pressure signal acquisition and processing unit comprises a differential pressure transmitter, a three-valve set and a conversion connector which are sequentially connected from top to bottom, and the differential pressure transmitter is connected with the converter; the adapter is respectively connected with the upstream pressure sampling pipe and the downstream pressure sampling pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122884127.2U CN216116185U (en) | 2021-11-24 | 2021-11-24 | Electromagnetic differential pressure type mass flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122884127.2U CN216116185U (en) | 2021-11-24 | 2021-11-24 | Electromagnetic differential pressure type mass flowmeter |
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| Publication Number | Publication Date |
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| CN216116185U true CN216116185U (en) | 2022-03-22 |
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| CN202122884127.2U Active CN216116185U (en) | 2021-11-24 | 2021-11-24 | Electromagnetic differential pressure type mass flowmeter |
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2021
- 2021-11-24 CN CN202122884127.2U patent/CN216116185U/en active Active
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