CN114942049A - Electronic measuring system for measuring mass flow rate - Google Patents
Electronic measuring system for measuring mass flow rate Download PDFInfo
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- CN114942049A CN114942049A CN202210530153.1A CN202210530153A CN114942049A CN 114942049 A CN114942049 A CN 114942049A CN 202210530153 A CN202210530153 A CN 202210530153A CN 114942049 A CN114942049 A CN 114942049A
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- Prior art keywords
- measuring
- temperature
- vibration
- control unit
- mass flow
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
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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
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8422—Coriolis or gyroscopic mass flowmeters constructional details exciters
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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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses an electronic measuring system for measuring mass flow rate, comprising: survey buret, main control unit and temperature acquisition unit, the current temperature that the temperature acquisition unit was used for gathering surveying buret, and the main control unit adjusts the vibration frequency of vibration excitation unit according to the current temperature that the temperature acquisition unit acquireed. The invention can determine the corresponding natural frequency by measuring the temperature of the measuring tube, thereby the measuring tube can work at the natural frequency under the driving of the vibration exciting unit, and the accuracy of the measuring result of the mass flow rate is improved.
Description
Technical Field
The present invention relates to the field of metrology devices, and in particular to an electronic measurement system for measuring mass flow rate.
Background
Mass flow rate, also known as mass flow, is a parameter that characterizes the mass of a fluid flowing through a pipe or the like in a unit of time. Among the mass flow rate measuring devices, those made using the coriolis principle are widely used.
A mass flow rate measuring device based on the coriolis principle generally comprises a measuring tube having a curvature, which is driven by a vibration exciting unit to vibrate, and then vibration signals at the inlet and outlet of the measuring tube are detected by a vibration sensor, and the mass flow rate through the measuring tube is determined by determining the phase time difference between the two vibration signals. In general, the measuring tube is operated at the natural frequency in order to obtain an optimum vibration signal. However, the natural frequency of the measuring tube is not constant, and even if the fluid flowing through the measuring tube is constant, the natural frequency of the measuring tube is influenced by many factors, and the temperature is one of the factors. When the temperature of the fluid flowing through the measuring tube differs, the measuring tube is also at a different temperature, and the natural frequency of the measuring tube itself changes. Neglecting the effect of temperature on the natural frequency adversely affects the accuracy of the measurement.
Disclosure of Invention
The embodiment of the invention provides an electronic measuring system for measuring mass flow rate, which is used for solving the problem that the influence of temperature on the vibration frequency of a measuring pipe is neglected to reduce the accuracy of a measuring result in the prior art.
In one aspect, embodiments of the present invention provide an electronic measurement system for measuring mass flow rate, comprising: a measuring tube and a main control unit;
the measuring tube is provided with a vibration excitation unit and a vibration acquisition unit, the vibration excitation unit is used for exciting the measuring tube to vibrate under the control of the main control unit, the vibration acquisition unit is used for acquiring vibration signals at the inlet end and the outlet end of the measuring tube, and the main control unit determines the mass flow of a medium flowing through the measuring tube according to the vibration signals acquired by the vibration acquisition unit;
the electronic measurement system further comprises a temperature acquisition unit, the temperature acquisition unit is used for acquiring the current temperature of the measurement pipe, and the main control unit adjusts the vibration frequency of the vibration excitation unit according to the current temperature acquired by the temperature acquisition unit.
In a possible implementation manner, after the temperature acquisition unit acquires the current temperature of the measuring tube, the main control unit determines the current natural frequency corresponding to the current temperature according to a relation curve between the temperature and the natural frequency, and the main control unit controls the vibration excitation unit to work at the current natural frequency.
In one possible embodiment, the relationship between temperature and natural frequency is determined by the master control unit from the information of the measuring tube.
In one possible embodiment, the main control unit determines the respective free-standing natural frequency from the information of the measuring tube, then determines the free-standing natural frequency of the measuring tube at the respective temperature by simulation, then determines the actual natural frequency corresponding to the free-standing natural frequency at the respective temperature from the data of the medium flowing through, and determines the temperature-natural frequency dependence from the dependence of the actual natural frequency on the respective temperature.
In one possible implementation, the master control unit determines the corresponding actual natural frequency from a variety of data flowing through the medium.
In a possible embodiment, a protective hood is provided, which is arranged outside the measuring tube.
In one possible implementation, the protective cover is made using a heat insulating material.
In a possible realization, the device further comprises an inlet pipe and an outlet pipe, wherein the inlet pipe and the outlet pipe are respectively connected with the inlet end and the outlet end of the measuring pipe.
The electronic measuring system for measuring mass flow rate in the invention has the following advantages:
by measuring the temperature of the measuring tube, the corresponding natural frequency can be determined, so that the measuring tube can be operated at the natural frequency under the driving of the vibration exciting unit, and the accuracy of the measuring result of the mass flow rate is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an overall configuration of an electronic measurement system for measuring mass flow rate according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an internal structure of a shield cap in an electronic measurement system for measuring a mass flow rate according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Fig. 1 and 2 are schematic structural diagrams of an electronic measurement system for measuring a mass flow rate according to an embodiment of the present invention. An embodiment of the present invention provides an electronic measurement system for measuring a mass flow rate, including: a measurement tube 400 and a master control unit;
the measuring tube 400 is provided with a vibration exciting unit 410 and a vibration collecting unit 420, the vibration exciting unit 410 is used for exciting the measuring tube 400 to vibrate under the control of the main control unit, the vibration collecting unit 420 is used for collecting vibration signals at the inlet end and the outlet end of the measuring tube 400, and the main control unit determines the mass flow of a medium flowing through the measuring tube 400 according to the vibration signals obtained by the vibration collecting unit 420;
the electronic measurement system further comprises a temperature acquisition unit 430, the temperature acquisition unit 430 is used for acquiring the current temperature of the measurement tube 400, and the main control unit adjusts the vibration frequency of the vibration excitation unit 410 according to the current temperature acquired by the temperature acquisition unit 430.
Illustratively, the inlet and outlet ends of the measurement pipe 400 are connected to the inlet pipe 100 and the outlet pipe 200, respectively, and a flowing medium flows from the inlet pipe 100 into the measurement pipe 400 and then flows out from the outlet pipe 200. The vibration exciting unit 410 is a device capable of generating vibration after being electrified, and the vibration frequency of the vibration exciting unit is in direct proportion to the magnitude of the electrified current, so that the main control unit can adjust the vibration frequency of the vibration exciting unit 410 by controlling the magnitude of the current. After the vibration exciting unit 410 is disposed on the measurement pipe 400, the measurement pipe 400 vibrates together with the vibration exciting unit 410 at the same frequency. The vibration pickup unit 420 operates on the opposite principle to the vibration exciting unit 410, and converts the vibration signal into a corresponding current signal when vibrating together with the measuring tube 400, and outputs the current signal to the main control unit. The vibration exciting unit 410 and the vibration collecting unit 420 may be fixed to the measuring pipe 400 by welding or bonding, so that vibration may be effectively transmitted.
In the embodiment of the present invention, it is not desirable to provide other devices on the measurement pipe 400 in addition to the vibration exciting unit 410 and the vibration collecting unit 420 described above so as not to affect the vibration of the measurement pipe 400. In order to obtain the temperature of the measuring pipe 400, the inlet pipe 100 or the outlet pipe 200 having the same material, thickness, etc. as the measuring pipe 400 may be used, and the temperature collecting unit 430 may collect the temperature of the inlet pipe 100 or the outlet pipe 200 as the temperature of the measuring pipe 400 when the medium flowing through the inlet pipe 100, the measuring pipe 400, and the outlet pipe 200 flows in sequence.
When the physical parameters of the measurement tube 400, such as length, arc, material, thickness, diameter, etc., are determined, the elastic modulus, i.e., stiffness, is determined, and since stiffness is proportional to the natural frequency and there is a specific conversion relationship, the natural frequency of the measurement tube 400 is determined. However, the natural frequency is not a constant parameter, which changes with the temperature of the measuring tube 400, in particular, decreases as the temperature of the measuring tube 400 increases, so that the main control unit needs to determine the corresponding natural frequency from the temperature of the measuring tube 400 and to control the vibration excitation unit 410 to operate at or near this natural frequency, in order to keep the measuring tube 400 at the natural frequency at all times. It should be understood that the natural frequency determined by the main control unit is only theoretical data, and it is different from actual data, so the natural frequency determined by the main control unit is a range value, and is not a specific point value, the main control unit determines a plurality of frequency points within the range value, then controls the vibration excitation unit 410 to work on the plurality of frequency points in sequence, records the vibration data acquired by the vibration acquisition unit 420, when the vibration excitation unit 410 completes the execution work of all the frequency points, the main control unit determines the natural frequency in the current state according to the amplitude of the measurement tube 400, and controls the vibration excitation unit 410 to work under the natural frequency in the subsequent measurement work.
In one possible embodiment, after the temperature acquisition unit 430 acquires the current temperature of the measurement pipe 400, the main control unit determines the current natural frequency corresponding to the current temperature according to the relationship curve between the temperature and the natural frequency, and the main control unit controls the vibration excitation unit 410 to operate at the current natural frequency.
Illustratively, the relationship between temperature and natural frequency is determined by the master control unit from the information of the measuring tube 400, in particular in the following manner:
the main control unit determines the corresponding natural frequency of the dead load from the information of the measuring tube 400, then determines the natural frequency of the dead load corresponding to the measuring tube 400 at each temperature by simulation, then determines the actual natural frequency corresponding to the natural frequency of the dead load at each temperature according to the data of the medium flowing through, and determines the relationship curve between the temperature and the natural frequency according to the relationship between the actual natural frequency and each temperature.
In the embodiment of the present invention, the coriolis based mass flow rate measuring devices sold and used on the market generally have a certain model, i.e., the information of the measuring tube 400, and the experimenter can measure the physical parameters of the measuring devices which are the main stream measuring devices on the market in a laboratory, and determine the idling natural frequency through experiments, i.e., the natural frequency when no medium flows through, and then determine the actual natural frequency through experiments again when a common medium, such as oil, natural gas, etc., is introduced. In the case of experimental determination of the free-standing natural frequency and the actual natural frequency of the measuring tube 400, both in the free-standing state and in the medium-fed state, the temperature of the measuring tube 400 has to be changed several times, and the data obtained contain the actual natural frequency versus temperature curve for the particular medium and model.
If the mass flow rate measurement device actually used is of a non-use type, the master control unit may determine the relationship between its corresponding temperature and natural frequency based on the physical parameters of the measurement tube 400 input by the user. Specifically, a known type of measuring tube 400 closest to the physical parameter may be queried for based on the input physical parameter, and the temperature vs. natural frequency curve of the known type of measuring tube 400 may then be modified as the temperature vs. natural frequency curve of the unknown measuring tube 400. Specifically, the main control unit may be electrically connected to the input unit through a wire to receive the physical parameters transmitted by the input unit under the operation of the user, or the user may also use a portable electronic device to transmit the input physical parameters to the main control unit in a wireless communication manner.
In one possible embodiment, the master control unit determines the corresponding actual natural frequency from a variety of data flowing through the medium.
For example, in the actual measurement, the main control unit cannot know the type of the medium in the measurement pipe 400, so that the user is required to select the preset information consistent with the actual type of the medium, and the main control unit can retrieve the relationship curve between the temperature and the natural frequency corresponding to the type of the medium after determining the type of the medium.
In a possible embodiment, a protective cover 300 is further included, the protective cover 300 being arranged outside the measurement tube 400.
Illustratively, the protective cover 300 may provide a stable and safe environment since the measurement tube 400 and the equipment thereon are precision equipment. Meanwhile, the protection cover 300 may be made of a heat insulating material, such as glass fiber, a vacuum plate, etc., which can insulate the inner and outer spaces of the protection cover 300, preventing the influence of the ambient temperature on the temperature of the measuring pipe 400, resulting in inaccurate temperature detection of the measuring pipe 400.
In a possible embodiment, it is characterized by further comprising an inlet pipe 100 and an outlet pipe 200, the inlet pipe 100 and the outlet pipe 200 being connected to the inlet end and the outlet end of the measuring pipe 400, respectively.
Illustratively, one end of each of the inlet pipe 100 and the outlet pipe 200 extends into the interior of the shield cap 300, and both ends of the measurement pipe 400 are connected to the ends of the inlet pipe 100 and the outlet pipe 200 located inside the shield cap 300.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An electronic measurement system for measuring mass flow rate, comprising: a measurement tube (400) and a master control unit;
the measuring pipe (400) is provided with a vibration exciting unit (410) and a vibration collecting unit (420), the vibration exciting unit (410) is used for exciting the measuring pipe (400) to vibrate under the control of the main control unit, the vibration collecting unit (420) is used for collecting vibration signals of the inlet end and the outlet end of the measuring pipe (400), and the main control unit determines the mass flow rate of a medium flowing through the measuring pipe (400) according to the vibration signals obtained by the vibration collecting unit (420);
the electronic measurement system further comprises a temperature acquisition unit (430), the temperature acquisition unit (430) is used for acquiring the current temperature of the measurement pipe (400), and the main control unit adjusts the vibration frequency of the vibration excitation unit (410) according to the current temperature acquired by the temperature acquisition unit (430).
2. The electronic measuring system for measuring mass flow rate according to claim 1, wherein after the temperature acquisition unit (430) acquires the current temperature of the measuring tube (400), the main control unit determines a current natural frequency corresponding to the current temperature according to a relationship curve between the temperature and the natural frequency, and the main control unit controls the vibration exciting unit (410) to operate at the current natural frequency.
3. The electronic measurement system for measuring mass flow rate according to claim 2, characterized in that the relation between temperature and natural frequency is determined by the master control unit from the information of the measurement tube (400).
4. The electronic measuring system for measuring mass flow rate according to claim 3, wherein the main control unit determines the corresponding natural unloaded frequency from the information of the measuring tube (400), then determines the natural unloaded frequency of the measuring tube (400) corresponding to each temperature by simulation, then determines the actual natural frequency corresponding to the natural unloaded frequency at each temperature according to the data of the medium flowing through, and the main control unit determines the relationship curve between the temperature and the natural frequency according to the relationship between the actual natural frequency and each temperature.
5. The electronic measurement system for measuring mass flow rate of claim 4, wherein the master control unit determines the corresponding actual natural frequency from a plurality of data flowing through the medium.
6. The electronic measurement system for measuring mass flow rate according to claim 1, further comprising a protective cover (300), the protective cover (300) being disposed outside the measurement pipe (400).
7. The electronic measurement system for measuring mass flow rate according to claim 6, characterized in that the protective cover (300) is made of a thermal insulating material.
8. The electronic measurement system for measuring mass flow rate of claim 1, further comprising an inlet pipe (100) and an outlet pipe (200), the inlet pipe (100) and outlet pipe (200) being connected to an inlet end and an outlet end of the measurement pipe (400), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530153.1A CN114942049A (en) | 2022-05-16 | 2022-05-16 | Electronic measuring system for measuring mass flow rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530153.1A CN114942049A (en) | 2022-05-16 | 2022-05-16 | Electronic measuring system for measuring mass flow rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114942049A true CN114942049A (en) | 2022-08-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210530153.1A Pending CN114942049A (en) | 2022-05-16 | 2022-05-16 | Electronic measuring system for measuring mass flow rate |
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| Country | Link |
|---|---|
| CN (1) | CN114942049A (en) |
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- 2022-05-16 CN CN202210530153.1A patent/CN114942049A/en active Pending
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