CA2966940A1 - Mass flow sensor - Google Patents
Mass flow sensor Download PDFInfo
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- CA2966940A1 CA2966940A1 CA2966940A CA2966940A CA2966940A1 CA 2966940 A1 CA2966940 A1 CA 2966940A1 CA 2966940 A CA2966940 A CA 2966940A CA 2966940 A CA2966940 A CA 2966940A CA 2966940 A1 CA2966940 A1 CA 2966940A1
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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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Abstract
A mass flow sensor, comprising: a first measurement tube (1) and a second measurement tube (2). The two measurement tubes have the same structure and the same size, and are provided in a shell (34) in parallel; an included angle between an axis where a straight tube segment (24) of each measurement tube is located and an axis where a first inclined tube segment (27) is located and an included angle between the axis where the first inclined tube segment (27) is located and an axis where a first port segment (31) is located are obtuse angles; and an included angle between the axis where the straight tube segment (24) is located and an axis where a second inclined tube segment (28) is located and an included angle between the axis where the second inclined tube segment (28) is located and an axis where a second port segment (32) is located are both obtuse angles. The mass flow sensor can reduce a resisting force caused by compressed natural gas when measuring a mass flow of the compressed natural gas, and can reliably measure a distance, so as to ensure that a measurement tube where the compressed natural gas circulates has a higher mechanical quality factor, better stability and stronger vibration resistance.
Description
MASS FLOW SENSOR
Technical Field The present invention relates to the technical field of compressed natural gas, and particularly to a mass flow sensor used for measuring the mass flow of the compressed natural gas.
Background As energy, the natural gas has the following advantages: firstly, the natural gas is a kind of high-quality green energy, its combustion emissions are far lower than those of coal and petroleum, so that the environmental pollution can be reduced; secondly, the natural gas is a kind of safe energy and contains no carbon monoxide, so that the harm to people and livestocks caused by leakage and other problems can be reduced, and meanwhile, the natural gas has a high ignition temperature and a narrow explosion limit, so that the safety is good; and thirdly, natural gas reserves are rich, and the exploration and development costs are low. Based on the above advantages, the natural gas plays an increasingly important role in the development of new energy. At present, compressed natural gas (Compressed Natural Gas, referred to as CNG) is widely used in the fields of electric power, chemical industry, city gas and the like, and particularly, natural gas powered vehicles are vigorously promoted in the United States, Russia, Japan, New Zealand, Australia, Canada and other countries. With the increasingly extensive application of the CNG, accurate measurement of the CNG in a trade process is directly related to the economic interests of both sides of the trade.
The gas pressure in a CNG dispenser is generally above 20MPa, the high pressure will change sensitive elements of a measurement tool, thereby affecting its measurement properties. In addition, because of the small density of the CNG, the requirements on the measurement precision of the measurement tool are higher. The above characteristics of the CNG determine that its measurement way is different from ordinary fluid measurement. At present, the methods for measuring high pressure gas flow mainly include an ultrasonic flowmeter, a thermal flowmeter and a Coriolis mass flowmeter:
the ultrasonic flowmeter is a meter which measures the flow by detecting the effect of fluid flow on an ultrasonic beam (or an ultrasonic pulse). As a meter circulation channel is not provided with any barrier, the ultrasonic flowmeter belongs to a barrier-free flowmeter and can carry out noncontact measurement, and no pressure loss is generated. However, the ultrasonic measurement method is generally not suitable for pipeline flow measurement with an apertures of less than 25mm, so that the application is limited.
The thermal mass flowmeter is a meter that measures the flow via the principle of heat transfer, that is, the heat transfer relationship between flowing fluid and a thermal source (a heated object in the fluid or a heating body beyond a measurement tube), and has the characteristics of small pressure loss and simple structure, etc. But its response time is long, so it is not suitable for the fluid flow measurement which changes rapidly.
The Coriolis mass flowmeter (Coriolis Mass Flowmeter, CMF) is a resonant sensor that measures the mass flow of the fluid flowing by the pipeline by the influence of the Coriolis effect generated by the fluid when flowing by the pipeline on the vibration phases or amplitudes on both ends of the pipeline, can directly sense the mass flow of the fluid, has the characteristics of high precision, small pressure loss, multi-parameter measurement and the like, and is widely used in the fields of industrial measurement and process control. Compared with the thermal mass flowmeter, its outstanding advantage lies in large range ratio, and thus the demands of different occasions can be satisfied. At present, most of the domestic CNG dispensers adopt the Coriolis mass flowmeters for measurement.
In a CNG gas station, the pressure, the temperature, the density and the flow rate of the gas change quickly in a gas filling process, and the gas components of the natural gas are different at different time and different locations, therefore some flowmeters are not suitable for serving as the measurement tools in this case. At present, the Coriolis mass flowmeters are widely used as the measurement tools of the CNG dispensers at home and abroad. For example, typical applications include the CNG050 model produced by the American Micro Motion, the CNGmass series produced by the Germany Endress
Technical Field The present invention relates to the technical field of compressed natural gas, and particularly to a mass flow sensor used for measuring the mass flow of the compressed natural gas.
Background As energy, the natural gas has the following advantages: firstly, the natural gas is a kind of high-quality green energy, its combustion emissions are far lower than those of coal and petroleum, so that the environmental pollution can be reduced; secondly, the natural gas is a kind of safe energy and contains no carbon monoxide, so that the harm to people and livestocks caused by leakage and other problems can be reduced, and meanwhile, the natural gas has a high ignition temperature and a narrow explosion limit, so that the safety is good; and thirdly, natural gas reserves are rich, and the exploration and development costs are low. Based on the above advantages, the natural gas plays an increasingly important role in the development of new energy. At present, compressed natural gas (Compressed Natural Gas, referred to as CNG) is widely used in the fields of electric power, chemical industry, city gas and the like, and particularly, natural gas powered vehicles are vigorously promoted in the United States, Russia, Japan, New Zealand, Australia, Canada and other countries. With the increasingly extensive application of the CNG, accurate measurement of the CNG in a trade process is directly related to the economic interests of both sides of the trade.
The gas pressure in a CNG dispenser is generally above 20MPa, the high pressure will change sensitive elements of a measurement tool, thereby affecting its measurement properties. In addition, because of the small density of the CNG, the requirements on the measurement precision of the measurement tool are higher. The above characteristics of the CNG determine that its measurement way is different from ordinary fluid measurement. At present, the methods for measuring high pressure gas flow mainly include an ultrasonic flowmeter, a thermal flowmeter and a Coriolis mass flowmeter:
the ultrasonic flowmeter is a meter which measures the flow by detecting the effect of fluid flow on an ultrasonic beam (or an ultrasonic pulse). As a meter circulation channel is not provided with any barrier, the ultrasonic flowmeter belongs to a barrier-free flowmeter and can carry out noncontact measurement, and no pressure loss is generated. However, the ultrasonic measurement method is generally not suitable for pipeline flow measurement with an apertures of less than 25mm, so that the application is limited.
The thermal mass flowmeter is a meter that measures the flow via the principle of heat transfer, that is, the heat transfer relationship between flowing fluid and a thermal source (a heated object in the fluid or a heating body beyond a measurement tube), and has the characteristics of small pressure loss and simple structure, etc. But its response time is long, so it is not suitable for the fluid flow measurement which changes rapidly.
The Coriolis mass flowmeter (Coriolis Mass Flowmeter, CMF) is a resonant sensor that measures the mass flow of the fluid flowing by the pipeline by the influence of the Coriolis effect generated by the fluid when flowing by the pipeline on the vibration phases or amplitudes on both ends of the pipeline, can directly sense the mass flow of the fluid, has the characteristics of high precision, small pressure loss, multi-parameter measurement and the like, and is widely used in the fields of industrial measurement and process control. Compared with the thermal mass flowmeter, its outstanding advantage lies in large range ratio, and thus the demands of different occasions can be satisfied. At present, most of the domestic CNG dispensers adopt the Coriolis mass flowmeters for measurement.
In a CNG gas station, the pressure, the temperature, the density and the flow rate of the gas change quickly in a gas filling process, and the gas components of the natural gas are different at different time and different locations, therefore some flowmeters are not suitable for serving as the measurement tools in this case. At present, the Coriolis mass flowmeters are widely used as the measurement tools of the CNG dispensers at home and abroad. For example, typical applications include the CNG050 model produced by the American Micro Motion, the CNGmass series produced by the Germany Endress
2 House (E + H), the SITRANS FCS200 model produced by the Siemens (SIEMENS), etc.
One of the common Coriolis mass sensors measures the mass flow via the principle that the fluid will generate a Coriolis force in direct proportion to the mass flow when flowing in a vibration tube. At present, people generally use a vibration tube type Coriolis mass flow sensor (as shown in Fig. 1), which mainly consists of a sensitive unit and a secondary meter, wherein the sensitive unit a includes measurement tubes al, a2, an exciter a5 and vibration pickups a3, a4; and the secondary meter b includes a closed loop control unit bl and a flow calculation unit b2, which are respectively control and signal processing systems of the sensitive unit. The sensitive unit outputs a vibration signal relevant to measured flow; the closed loop control unit bl provides an excitation signal for the exciter a5 to maintain the measurement tubes in a resonant state and track the vibration frequency of the measurement tubes al, a2 in real time; and the flow calculation unit b2 processes output signals of the vibration pickups a3, a4 and outputs measurement information, so as to determine the mass flow and the density of the measured fluid.
Since the aforementioned sensor adopts a U-shaped tube having a very large curvature, a larger resistance will be generated on the flow of the compressed natural gas, and few distance elements are provided, so it is difficult to guarantee higher mechanical quality factors, better stability and stronger seismic resistance.
Summary The technical problem to be solved in the present invention is how to reduce the resistance generated on compressed natural gas, firmly realize distance detection and guarantee higher mechanical quality factors, better stability and stronger seismic resistance for circulation measurement tubes of the compressed natural gas, when the mass flow of the compressed natural gas is measured.
To this end, the present invention provides a mass flow sensor used for measuring the mass flow of the compressed natural gas, including: a first measurement tube and a second measurement tube, wherein the first measurement tube and the second
One of the common Coriolis mass sensors measures the mass flow via the principle that the fluid will generate a Coriolis force in direct proportion to the mass flow when flowing in a vibration tube. At present, people generally use a vibration tube type Coriolis mass flow sensor (as shown in Fig. 1), which mainly consists of a sensitive unit and a secondary meter, wherein the sensitive unit a includes measurement tubes al, a2, an exciter a5 and vibration pickups a3, a4; and the secondary meter b includes a closed loop control unit bl and a flow calculation unit b2, which are respectively control and signal processing systems of the sensitive unit. The sensitive unit outputs a vibration signal relevant to measured flow; the closed loop control unit bl provides an excitation signal for the exciter a5 to maintain the measurement tubes in a resonant state and track the vibration frequency of the measurement tubes al, a2 in real time; and the flow calculation unit b2 processes output signals of the vibration pickups a3, a4 and outputs measurement information, so as to determine the mass flow and the density of the measured fluid.
Since the aforementioned sensor adopts a U-shaped tube having a very large curvature, a larger resistance will be generated on the flow of the compressed natural gas, and few distance elements are provided, so it is difficult to guarantee higher mechanical quality factors, better stability and stronger seismic resistance.
Summary The technical problem to be solved in the present invention is how to reduce the resistance generated on compressed natural gas, firmly realize distance detection and guarantee higher mechanical quality factors, better stability and stronger seismic resistance for circulation measurement tubes of the compressed natural gas, when the mass flow of the compressed natural gas is measured.
To this end, the present invention provides a mass flow sensor used for measuring the mass flow of the compressed natural gas, including: a first measurement tube and a second measurement tube, wherein the first measurement tube and the second
3 measurement tube have the same structure and the same size and are arranged in a shell in parallel, each measurement tube includes a straight tube segment, a first circular arc segment, a second circular arc segment, a third circular arc segment, a fourth circular arc segment, a first inclined tube segment, a second inclined tube segment, a first port segment and a second port segment, wherein the first circular arc segment, the first inclined tube segment, the third circular arc segment and the first port segment are respectively symmetrical to the second circular arc segment, the second inclined tube segment, the fourth circular arc segment and the second port segment relative to a plane which is vertical to and equally divides the straight tube segment, the first circular arc segment is connected to the straight tube segment, the first inclined tube segment is connected to the first circular arc segment, the third circular arc segment is connected to the first inclined tube segment, the first port segment is connected to the third circular arc segment, the second circular arc segment is connected to the straight tube segment, the second inclined tube segment is connected to the second circular arc segment, the fourth circular arc segment is connected to the second inclined tube segment, the second port segment is connected to the fourth circular arc segment, an included angle between an axial line on which the straight tube segment is located and the axial line on which the first inclined tube segment is located, and the included angle between the axial line on which the first inclined tube segment is located and the axial line on which the first port segment is located are obtuse angles, and the included angle between the axial line on which the straight tube segment is located and the axial line on which the second inclined tube segment is located, and the included angle between the axial line on which the second inclined tube segment is located and the axial line on which the second port segment is located are both obtuse angles; exciters, arranged on the straight tube segment of the first measurement tube, the straight tube segment of the second measurement tube and the planes which are vertical to and equally divide the straight tube segments; first detectors, arranged on connection parts of the first circular arc segments and the first inclined tube segments of the first measurement tube and the second measurement tube; second detectors, arranged on the connection parts of the second circular arc segments and the second inclined tube segments of the first measurement tube and the second measurement tube; a first shunt, arranged at the outside of the shell and connected with the first port segment; a second shunt, arranged at the outside of the shell and connected with the second port segment; a first nut,
4 arranged at the outside of the shell and connected to the first shunt; and a second nut, arranged at the outside of the shell and connected to the second shunt.
Preferably, the exciters include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube and the second measurement tube by braze welding.
Preferably, the first detectors and the second detectors respectively include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube and the second measurement tube by braze welding.
Preferably, the mass flow sensor further includes: first distance plates, arranged on the connection parts of the first port segments and the third circular arc segments on the first measurement tube and the second measurement tube; second distance plates, arranged on the connection parts of the third circular arc segments and the first inclined tube segments on the first measurement tube and the second measurement tube;
third distance plates, arranged on the connection parts of the second port segments and the fourth circular arc segments on the first measurement tube and the second measurement tube; and fourth distance plates, arranged on the connection parts of the fourth circular arc segments and the second inclined tube segments on the first measurement tube and the second measurement tube.
Preferably, the mass flow sensor further includes: a first reinforcing sleeve, arranged on the connection part of the first port segment of the first measurement tube and the first shunt; a second reinforcing sleeve, arranged on the connection part of the second port segment of the first measurement tube and the second shunt; a third reinforcing sleeve, arranged on the connection part of the first port segment of the second measurement tube and the first shunt; and a fourth reinforcing sleeve, arranged on the connection part of the second port segment of the second measurement tube and the second shunt.
Preferably, the exciters include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube and the second measurement tube by braze welding.
Preferably, the first detectors and the second detectors respectively include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube and the second measurement tube by braze welding.
Preferably, the mass flow sensor further includes: first distance plates, arranged on the connection parts of the first port segments and the third circular arc segments on the first measurement tube and the second measurement tube; second distance plates, arranged on the connection parts of the third circular arc segments and the first inclined tube segments on the first measurement tube and the second measurement tube;
third distance plates, arranged on the connection parts of the second port segments and the fourth circular arc segments on the first measurement tube and the second measurement tube; and fourth distance plates, arranged on the connection parts of the fourth circular arc segments and the second inclined tube segments on the first measurement tube and the second measurement tube.
Preferably, the mass flow sensor further includes: a first reinforcing sleeve, arranged on the connection part of the first port segment of the first measurement tube and the first shunt; a second reinforcing sleeve, arranged on the connection part of the second port segment of the first measurement tube and the second shunt; a third reinforcing sleeve, arranged on the connection part of the first port segment of the second measurement tube and the first shunt; and a fourth reinforcing sleeve, arranged on the connection part of the second port segment of the second measurement tube and the second shunt.
5 Preferably, the first shunt is connected with the first reinforcing sleeve and the third reinforcing sleeve by argon arc welding, the second shunt is connected with the second reinforcing sleeve and the fourth reinforcing sleeve by argon arc welding, the first reinforcing sleeve and the second reinforcing sleeve are welded on the first measurement tube by braze welding, the third reinforcing sleeve and the fourth reinforcing sleeve are welded on the second measurement tube by braze welding, and the first shunt and the second shunt are welded on the shell by argon arc welding.
Preferably, the mass flow sensor further includes: temperature sensors and fixing parts, and the fixing parts are used for fixing the temperature sensors to the first distance plates.
Preferably, the mass flow sensor further includes: a supporting beam arranged between the first measurement tube and the second measurement tube, and both ends of the supporting beam are welded on the first shunt and the second shunt by argon arc welding and are parallel to the first measurement tube and the second measurement tube for fixing and supporting conducting wires in the shell.
Preferably, the mass flow sensor further includes: a connection tube and an adapting flange, the connection tube is used for connecting the shell and the adapting flange, and the adapting flange is sealed with an adapting bolt through a rubber column.
Preferably, the mass flow sensor further includes: a pressure switch, arranged on an upper surface of the shell and used for detecting the pressure in the shell and sending a prompt message when the pressure is greater than an early warning threshold.
Preferably, a groove is formed in a side face of the shell.
By means of the aforementioned technical solutions, when the mass flow of the compressed natural gas is measured, the resistance generated on the compressed natural gas can be reduced, and firm distance detection can be realized to guarantee higher mechanical quality factors, better stability and stronger seismic resistance for the circulation measurement tubes of the compressed natural gas.
Preferably, the mass flow sensor further includes: temperature sensors and fixing parts, and the fixing parts are used for fixing the temperature sensors to the first distance plates.
Preferably, the mass flow sensor further includes: a supporting beam arranged between the first measurement tube and the second measurement tube, and both ends of the supporting beam are welded on the first shunt and the second shunt by argon arc welding and are parallel to the first measurement tube and the second measurement tube for fixing and supporting conducting wires in the shell.
Preferably, the mass flow sensor further includes: a connection tube and an adapting flange, the connection tube is used for connecting the shell and the adapting flange, and the adapting flange is sealed with an adapting bolt through a rubber column.
Preferably, the mass flow sensor further includes: a pressure switch, arranged on an upper surface of the shell and used for detecting the pressure in the shell and sending a prompt message when the pressure is greater than an early warning threshold.
Preferably, a groove is formed in a side face of the shell.
By means of the aforementioned technical solutions, when the mass flow of the compressed natural gas is measured, the resistance generated on the compressed natural gas can be reduced, and firm distance detection can be realized to guarantee higher mechanical quality factors, better stability and stronger seismic resistance for the circulation measurement tubes of the compressed natural gas.
6 Brief Description of the Drawings The features and advantages of the present invention will be understood more clearly with reference to the accompanying drawings, the accompanying drawings are schematic and cannot be understood as any limitation to the present invention, and in the accompany drawings:
Fig. 1 shows a structural schematic diagram of a mass flow sensor in the prior art;
Fig. 2 shows a structural schematic diagram of a mass flow sensor according to one embodiment of the present invention;
Fig. 3 shows a front view of a mass flow sensor according to one embodiment of the present invention;
Fig. 4 shows a top view of a mass flow sensor according to one embodiment of the present invention;
Fig. 5 shows a structural schematic diagram of a measurement tube in a mass flow sensor according to one embodiment of the present invention;
Fig. 6 shows a schematic diagram of a detector and an exciter in a mass flow sensor according to one embodiment of the present invention;
Fig. 7 shows a schematic diagram of a distance plate in a mass flow sensor according to one embodiment of the present invention;
Fig. 8 shows a schematic diagram of a mounting relationship between a distance plate and a measurement tube in a mass flow sensor according to one embodiment of the present invention;
Fig. 9 shows a schematic diagram of a fixing part in a mass flow sensor according to one embodiment of the present invention;
Fig. 1 shows a structural schematic diagram of a mass flow sensor in the prior art;
Fig. 2 shows a structural schematic diagram of a mass flow sensor according to one embodiment of the present invention;
Fig. 3 shows a front view of a mass flow sensor according to one embodiment of the present invention;
Fig. 4 shows a top view of a mass flow sensor according to one embodiment of the present invention;
Fig. 5 shows a structural schematic diagram of a measurement tube in a mass flow sensor according to one embodiment of the present invention;
Fig. 6 shows a schematic diagram of a detector and an exciter in a mass flow sensor according to one embodiment of the present invention;
Fig. 7 shows a schematic diagram of a distance plate in a mass flow sensor according to one embodiment of the present invention;
Fig. 8 shows a schematic diagram of a mounting relationship between a distance plate and a measurement tube in a mass flow sensor according to one embodiment of the present invention;
Fig. 9 shows a schematic diagram of a fixing part in a mass flow sensor according to one embodiment of the present invention;
7 Fig. 10 shows a schematic diagram of a mounting relationship between a fixing part and a distance plate in a mass flow sensor according to one embodiment of the present invention;
Fig. 11 shows a schematic diagram of a side face of a shell of a mass flow sensor according to one embodiment of the present invention.
Illustration to reference signs:
1-first measurement tube; 2-second measurement tube; 3-exciter; 4-first detector; 5-second detector; 6-first distance plate; 7-second distance plate; 8-third distance plate;
9-fourth distance plate; 10-first nut; 11-second nut; 12-first shunt; 13-second shunt; 14-first reinforcing sleeve; 15-second reinforcing sleeve; 16-third reinforcing sleeve; 17-fourth reinforcing sleeve; 18-supporting beam; 19-connection tube; 20-adapting flange;
21-fixing part; 22-shell; 23-presure switch; 24-straight tube segment; 25-first circular arc segment; 26-second circular arc segment; 27-first inclined tube segment;
28-second inclined tube segment; 29-third circular arc segment; 30-fourth circular arc segment;
31-first port segment; 32-second port segment; and 34-shell.
Detailed Description To understand the aforementioned purposes, features and advantages of the present invention more clearly, the present invention will be further described below in detail in combination with the accompanying drawings and specific implementations. It should be noted that the embodiments and the features in the embodiments of the present application can be mutually combined without generating conflict.
Many specific details are illustrated in the description below to fully understand the present invention, but the present invention can also be implemented in other manners different from what is described herein, and thus the protection scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in Fig. 2 and Fig. 3, a mass flow sensor according to one embodiment of the present invention is used for measuring the mass flow of the compressed natural gas,
Fig. 11 shows a schematic diagram of a side face of a shell of a mass flow sensor according to one embodiment of the present invention.
Illustration to reference signs:
1-first measurement tube; 2-second measurement tube; 3-exciter; 4-first detector; 5-second detector; 6-first distance plate; 7-second distance plate; 8-third distance plate;
9-fourth distance plate; 10-first nut; 11-second nut; 12-first shunt; 13-second shunt; 14-first reinforcing sleeve; 15-second reinforcing sleeve; 16-third reinforcing sleeve; 17-fourth reinforcing sleeve; 18-supporting beam; 19-connection tube; 20-adapting flange;
21-fixing part; 22-shell; 23-presure switch; 24-straight tube segment; 25-first circular arc segment; 26-second circular arc segment; 27-first inclined tube segment;
28-second inclined tube segment; 29-third circular arc segment; 30-fourth circular arc segment;
31-first port segment; 32-second port segment; and 34-shell.
Detailed Description To understand the aforementioned purposes, features and advantages of the present invention more clearly, the present invention will be further described below in detail in combination with the accompanying drawings and specific implementations. It should be noted that the embodiments and the features in the embodiments of the present application can be mutually combined without generating conflict.
Many specific details are illustrated in the description below to fully understand the present invention, but the present invention can also be implemented in other manners different from what is described herein, and thus the protection scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in Fig. 2 and Fig. 3, a mass flow sensor according to one embodiment of the present invention is used for measuring the mass flow of the compressed natural gas,
8 and includes: a first measurement tube 1 and a second measurement tube 2, wherein the first measurement tube 1 and the second measurement tube 2 have the same structure and the same size and are arranged in a shell 34 in parallel, as shown in Fig.
5, each measurement tube includes a straight tube segment 24, a first circular arc segment 25, a second circular arc segment 26, a third circular arc segment 29, a fourth circular arc segment 30, a first inclined tube segment 27, a second inclined tube segment 28, a first port segment 31 and a second port segment 32, wherein the first circular arc segment 25, the first inclined tube segment 27, the third circular arc segment 29 and the first port segment 31 are respectively symmetrical to the second circular arc segment 26, the second inclined tube segment 28, the fourth circular arc segment 30 and the second port segment 32 relative to a plane which is vertical to and equally divides the straight tube segment 24, the first circular arc segment 25 is connected to the straight tube segment 24, the first inclined tube segment 27 is connected to the first circular arc segment 25, the third circular arc segment 29 is connected to the first inclined tube segment 27, the first port segment 31 is connected to the third circular arc segment 29, the second circular arc segment 26 is connected to the straight tube segment 24, the second inclined tube segment 28 is connected to the second circular arc segment 26, the fourth circular arc segment 30 is connected to the second inclined tube segment 28, the second port segment 32 is connected to the fourth circular arc segment 30, an included angle between an axial line on which the straight tube segment 24 is located and the axial line on which the first inclined tube segment 27 is located, and the included angle between the axial line on which the first inclined tube segment 27 is located and the axial line on which the first port segment 31 is located are obtuse angles, and the included angle between the axial line on which the straight tube segment 24 is located and the axial line on which the second inclined tube segment 28 is located, and the included angle between the axial line on which the second inclined tube segment 28 is located and the axial line on which the second port segment 32 is located are both obtuse angles; as shown in Fig. 6, the mass flow sensor further includes: exciters 3, arranged on the straight tube segment 24 of the first measurement tube 1, the straight tube segment of the second measurement tube 2 and the planes which are vertical to and equally divide the straight tube segments 24; first detectors 4, arranged on connection parts of the first circular arc segments 25 and the first inclined tube segments 27 of the first measurement tube 1 and the second measurement tube 2; second detectors 5, arranged on the connection parts of the second circular arc segments 26 and the second inclined tube
5, each measurement tube includes a straight tube segment 24, a first circular arc segment 25, a second circular arc segment 26, a third circular arc segment 29, a fourth circular arc segment 30, a first inclined tube segment 27, a second inclined tube segment 28, a first port segment 31 and a second port segment 32, wherein the first circular arc segment 25, the first inclined tube segment 27, the third circular arc segment 29 and the first port segment 31 are respectively symmetrical to the second circular arc segment 26, the second inclined tube segment 28, the fourth circular arc segment 30 and the second port segment 32 relative to a plane which is vertical to and equally divides the straight tube segment 24, the first circular arc segment 25 is connected to the straight tube segment 24, the first inclined tube segment 27 is connected to the first circular arc segment 25, the third circular arc segment 29 is connected to the first inclined tube segment 27, the first port segment 31 is connected to the third circular arc segment 29, the second circular arc segment 26 is connected to the straight tube segment 24, the second inclined tube segment 28 is connected to the second circular arc segment 26, the fourth circular arc segment 30 is connected to the second inclined tube segment 28, the second port segment 32 is connected to the fourth circular arc segment 30, an included angle between an axial line on which the straight tube segment 24 is located and the axial line on which the first inclined tube segment 27 is located, and the included angle between the axial line on which the first inclined tube segment 27 is located and the axial line on which the first port segment 31 is located are obtuse angles, and the included angle between the axial line on which the straight tube segment 24 is located and the axial line on which the second inclined tube segment 28 is located, and the included angle between the axial line on which the second inclined tube segment 28 is located and the axial line on which the second port segment 32 is located are both obtuse angles; as shown in Fig. 6, the mass flow sensor further includes: exciters 3, arranged on the straight tube segment 24 of the first measurement tube 1, the straight tube segment of the second measurement tube 2 and the planes which are vertical to and equally divide the straight tube segments 24; first detectors 4, arranged on connection parts of the first circular arc segments 25 and the first inclined tube segments 27 of the first measurement tube 1 and the second measurement tube 2; second detectors 5, arranged on the connection parts of the second circular arc segments 26 and the second inclined tube
9 segments 28 of the first measurement tube 1 and the second measurement tube 2;
a first shunt 12, arranged at the outside of the shell 34 and connected with the first port segment 31; a second shunt 13, arranged at the outside of the shell 34 and connected with the second port segment 32; a first nut 10, arranged at the outside of the shell 34 and connected to the first shunt 12; and a second nut 11, arranged at the outside of the shell 34 and connected to the second shunt 13.
According to the Coriolis effect, for the two measurement tubes, double distance plates are fixed and welded on both sides of the measurement tubes, and the two measurement tubes are firmly welded on outer end faces of the shunts in parallel to form a tuning fork to eliminate the influence of external vibration. The two measurement tubes vibrate at their inherent frequency under the excitation of electromagnetic exciters, and the vibration phases are reverse. Due to the vibration effect of the measurement tubes, each fluid micelle flowing in the tubes obtains a Coriolis acceleration, and the measurement tubes are applied with distribution Coriolis forces reverse to the acceleration direction.
Since the directions of the Coriolis forces applied to the inlet and outlet sides of the measurement tubes are reverse, the measurement tubes twist, and the torsion degree is in direct proportion to instantaneous mass flow in the tubes. Two electromagnetic detectors on an inflow side and an outflow side of the measurement tube detect two paths of vibration signals in the process of each vibration circle of the tuning fork, the phase difference of the two paths of signals is in direct proportion to the torsion degree of the measurement tube, namely the instantaneous flow. The mass flow can be calculated by calculating the phase difference between the signals.
Since the included angles between the axial lines of the straight tube segments and the inclined tube segments are obtuse angles, the included angles between the axial lines of the inclined tube segments and the port segments are obtuse angles, and the segments are connected by the circular arc segments, so that the transition is smooth, when the compressed natural gas flows in the measurement tubes, no larger resistance will be generated on the compressed natural gas, the performance and the mechanical quality factor of the resonant sensor are effectively improved, the flow field effect is greatly reduced, the flow resistance is small, the pressure loss is low, the mass flow of the gas can be measured, the processing is simple, and the cost is low.
The tube material of the two measurement tubes can be 316L stainless steel, holmium and hastelloy, and of course, other tube materials can also be selected according to demands. The measurement tubes can be integrally formed and can also be assembled by the straight tube segments, the circular arc segments and the inclined tube segments.
When the fluid does not flow by the sensor, the exciters excite the measurement tubes to vibrate at their inherent frequencies, at this time, sinusoidal signal frequency and phases detected by the two detectors at the inlet sides and the outlet sides of the measurement tubes are completely the same, with no phase difference generated.
At this time, the measurement tubes are hollow tubes, the resonant frequency of the measurement tubes are density reference frequency, that is, the frequency when there is no fluid, and the numerical values of measured real-time density and the mass flow of the fluid are 0. When the fluid flows by the sensor, firstly, the flow of the fluid in the measurement tubes induces the Coriolis effect, both ends of the measurement tubes are applied with Coriolis forces having the same magnitude and reverse direction due to the influence of moments, which is embodied in that the sinusoidal signals detected by the two detectors have a phase difference, the phase difference is in direct proportion to the mass flow of the fluid, and the real-time mass flow of the fluid can be obtained by detecting the magnitude of the phase difference.
Preferably, the exciters 3 include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube 1 and the second measurement tube 2 by braze welding. The exciters are used for exciting the measurement tubes to vibrate, and the measurement tubes are in a simple harmonic vibration state by closed loop control systems to cause the sensor to vibrate at its inherent frequency.
Preferably, the first detectors 4 and the second detectors 6 respectively include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube 1 and the second measurement tube 2 by braze welding.
For the exciters and the detectors, the coils and the magnetic steel are cooperatively used, the exciters are mounted at the central axes of the straight tube segments at the middle of the two opposite measurement tubes, the detectors are located at the connection sites of smooth transition of the first parts of circular arc tube segments and the inclined tube segments of the measurement tubes, and the detectors are mounted outward to form a good closed loop system together, so that the detection tube of the sensor has a stable working state, the influence of external disturbance is reduced, and the self-regulation ability is improved.
As shown in Fig. 8, preferably, the mass flow sensor further includes: first distance plates 6, arranged on the connection parts of the first port segments 31 and the third circular arc segments 29 on the first measurement tube 1 and the second measurement tube 2; second distance plates 7, arranged on the connection parts of the third circular arc segments 29 and the first inclined tube segments 27 on the first measurement tube 1 and the second measurement tube 2; third distance plates 8, arranged on the connection parts of the second port segments 32 and the fourth circular arc segments 30 on the first measurement tube 1 and the second measurement tube 2; and fourth distance plates 9, arranged on the connection parts of the fourth circular arc segments 30 and the second inclined tube segments 28 on the first measurement tube 1 and the second measurement tube 2.
As shown in Fig. 7, four distance plates are respectively composed of two E-shaped plates, two distance plates are located at smooth connection sites of the circular arc segments and the port segments of the measurement tube, two distance plates are located at the smooth connection sites of the inclined tube segments and the circular arc segments of the measurement tube, and a double distance mode is realized by two groups of distance plates, so that the resonant frequency of the measurement tube is higher, the stability is good, and the seismic resistance is strong. Moreover, a plurality of through holes are formed in each distance plate to enable the internal circuit of the shell to penetrate through, which is conducive to the layout of the internal circuit.
The two measurement tubes are simultaneously fixed by the distance plates in a vacuum braze welding manner, so that the measurement tubes are unlikely to deform, the properties of the two measurement tubes are completely the same as much as possible, meanwhile limited twisting and bending necessary for flow measurement are provided, and the positions of the double distance plates on the straight tube segments can be changed to change the resonant frequency of the sensor, so that the positions of the double distance plates on the straight tube segments can be determined according to the designed frequency to reduce the vibration coupling of the internal measurement tubes and reinforce the seismic resistance of the measurement tubes.
Preferably, the mass flow sensor further includes: a first reinforcing sleeve 14, arranged on the connection part of the first port segment 31 of the first measurement tube 1 and the first shunt 12; a second reinforcing sleeve 15, arranged on the connection part of the second port segment 32 of the first measurement tube 1 and the second shunt 13; a third reinforcing sleeve 16, arranged on the connection part of the first port segment 31 of the second measurement tube 2 and the first shunt 12; and a fourth reinforcing sleeve 17, arranged on the connection part of the second port segment 32 of the second measurement tube 2 and the second shunt 13.
Preferably, the first shunt 12 is connected with the first reinforcing sleeve 14 and the third reinforcing sleeve 16 by argon arc welding, the second shunt 13 is connected with the second reinforcing sleeve 15 and the fourth reinforcing sleeve 17 by argon arc welding, the first reinforcing sleeve 14 and the second reinforcing sleeve 15 are welded on the first measurement tube 1 by braze welding, the third reinforcing sleeve 16 and the fourth reinforcing sleeve 17 are welded on the second measurement tube 2 by braze welding, and the first shunt 12 and the second shunt 13 are welded on the shell 34 by argon arc welding.
As shown in Fig. 9 and Fig. 10, preferably, the mass flow sensor further includes:
temperature sensors (not shown in the figures) and fixing parts 21, and the fixing parts 21 are used for fixing the temperature sensors to the first distance plates 6.
The temperature sensors can be directly fixed on the distance plates by the fixing parts of the temperature sensors to sense the temperature change in the sensors more directly, so as to obtain a sensing value closer to an actual temperature in the detection tube to improve the subsequent processing precision.
As shown in Fig. 4, preferably, the mass flow sensor further includes: a supporting beam 18 arranged between the first measurement tube 1 and the second measurement tube 2, and both ends of the supporting beam are welded on the first shunt 12 and the second shunt 13 by argon arc welding and are parallel to the first measurement tube 1 and the second measurement tube 2 for fixing and supporting conducting wires in the shell 34. The supporting beam is used for fixing and supporting the conducting wires, so that the wiring is more convenient, and the internal structure of the shell is trimmed and simplified conveniently.
Preferably, the mass flow sensor further includes: a connection tube 19 and an adapting flange 20, the connection tube 19 is used for connecting the shell 34 and the adapting flange 20, and the adapting flange 20 is sealed with an adapting bolt through a rubber column. The adapting flange is sealed by an extrusion manner of the rubber column and the adapting bolt, so that the sealing effect and the mounting convenience can be improved.
Preferably, the mass flow sensor further includes: a pressure switch 23, arranged on an upper surface of the shell 34 and used for detecting the pressure in the shell 34 and sending a prompt message when the pressure is greater than an early warning threshold.
The pressure switch is mounted on the shell of the sensor to detect the pressure change in the shell of the sensor, and timely early warning can be carried out when the internal pressure is greater to prevent the sensor from being damaged.
As shown in Fig. 11, preferably, a groove is formed in a side face of the shell 34 to improve the overall strength of the shell. The shell 34 is specifically divided into an upper shell and a lower shell to be conveniently dismounted and mounted.
The technical solutions of the present invention have been described above in detail with reference to the accompanying drawings. Considering that a U-shaped tube having a very large curvature is adopted in related technology to generate a larger resistance to the flow of the compressed natural gas, and that the distance elements are few, a higher mechanical quality factor, better stability and stronger seismic resistance are difficult to guarantee. By means of the technical solutions of the present application, when the mass flow of the compressed natural gas is measured, the resistance generated on the compressed natural gas can be reduced, and firm distance detection can be realized to guarantee higher mechanical quality factors, better stability and stronger seismic resistance for the circulation measurement tubes of the compressed natural gas.
Industrial Applicability According to the mass flow sensor provided by the present invention, the included angles between the axial lines of the straight tube segments and the inclined tube segments are set to be obtuse angles, the included angles between the axial lines of the inclined tube segments and the port segments are set to be obtuse angles, and the segments are connected by the circular arc segments, so that the transition is smooth, when the compressed natural gas flows in the measurement tubes, no larger resistance will be generated on the compressed natural gas, when the mass flow of the compressed natural gas is measured, the resistance generated on the compressed natural gas can be reduced, and firm distance detection can be realized to guarantee higher mechanical quality factors, better stability and stronger seismic resistance for the circulation measurement tubes of the compressed natural gas.
a first shunt 12, arranged at the outside of the shell 34 and connected with the first port segment 31; a second shunt 13, arranged at the outside of the shell 34 and connected with the second port segment 32; a first nut 10, arranged at the outside of the shell 34 and connected to the first shunt 12; and a second nut 11, arranged at the outside of the shell 34 and connected to the second shunt 13.
According to the Coriolis effect, for the two measurement tubes, double distance plates are fixed and welded on both sides of the measurement tubes, and the two measurement tubes are firmly welded on outer end faces of the shunts in parallel to form a tuning fork to eliminate the influence of external vibration. The two measurement tubes vibrate at their inherent frequency under the excitation of electromagnetic exciters, and the vibration phases are reverse. Due to the vibration effect of the measurement tubes, each fluid micelle flowing in the tubes obtains a Coriolis acceleration, and the measurement tubes are applied with distribution Coriolis forces reverse to the acceleration direction.
Since the directions of the Coriolis forces applied to the inlet and outlet sides of the measurement tubes are reverse, the measurement tubes twist, and the torsion degree is in direct proportion to instantaneous mass flow in the tubes. Two electromagnetic detectors on an inflow side and an outflow side of the measurement tube detect two paths of vibration signals in the process of each vibration circle of the tuning fork, the phase difference of the two paths of signals is in direct proportion to the torsion degree of the measurement tube, namely the instantaneous flow. The mass flow can be calculated by calculating the phase difference between the signals.
Since the included angles between the axial lines of the straight tube segments and the inclined tube segments are obtuse angles, the included angles between the axial lines of the inclined tube segments and the port segments are obtuse angles, and the segments are connected by the circular arc segments, so that the transition is smooth, when the compressed natural gas flows in the measurement tubes, no larger resistance will be generated on the compressed natural gas, the performance and the mechanical quality factor of the resonant sensor are effectively improved, the flow field effect is greatly reduced, the flow resistance is small, the pressure loss is low, the mass flow of the gas can be measured, the processing is simple, and the cost is low.
The tube material of the two measurement tubes can be 316L stainless steel, holmium and hastelloy, and of course, other tube materials can also be selected according to demands. The measurement tubes can be integrally formed and can also be assembled by the straight tube segments, the circular arc segments and the inclined tube segments.
When the fluid does not flow by the sensor, the exciters excite the measurement tubes to vibrate at their inherent frequencies, at this time, sinusoidal signal frequency and phases detected by the two detectors at the inlet sides and the outlet sides of the measurement tubes are completely the same, with no phase difference generated.
At this time, the measurement tubes are hollow tubes, the resonant frequency of the measurement tubes are density reference frequency, that is, the frequency when there is no fluid, and the numerical values of measured real-time density and the mass flow of the fluid are 0. When the fluid flows by the sensor, firstly, the flow of the fluid in the measurement tubes induces the Coriolis effect, both ends of the measurement tubes are applied with Coriolis forces having the same magnitude and reverse direction due to the influence of moments, which is embodied in that the sinusoidal signals detected by the two detectors have a phase difference, the phase difference is in direct proportion to the mass flow of the fluid, and the real-time mass flow of the fluid can be obtained by detecting the magnitude of the phase difference.
Preferably, the exciters 3 include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube 1 and the second measurement tube 2 by braze welding. The exciters are used for exciting the measurement tubes to vibrate, and the measurement tubes are in a simple harmonic vibration state by closed loop control systems to cause the sensor to vibrate at its inherent frequency.
Preferably, the first detectors 4 and the second detectors 6 respectively include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube 1 and the second measurement tube 2 by braze welding.
For the exciters and the detectors, the coils and the magnetic steel are cooperatively used, the exciters are mounted at the central axes of the straight tube segments at the middle of the two opposite measurement tubes, the detectors are located at the connection sites of smooth transition of the first parts of circular arc tube segments and the inclined tube segments of the measurement tubes, and the detectors are mounted outward to form a good closed loop system together, so that the detection tube of the sensor has a stable working state, the influence of external disturbance is reduced, and the self-regulation ability is improved.
As shown in Fig. 8, preferably, the mass flow sensor further includes: first distance plates 6, arranged on the connection parts of the first port segments 31 and the third circular arc segments 29 on the first measurement tube 1 and the second measurement tube 2; second distance plates 7, arranged on the connection parts of the third circular arc segments 29 and the first inclined tube segments 27 on the first measurement tube 1 and the second measurement tube 2; third distance plates 8, arranged on the connection parts of the second port segments 32 and the fourth circular arc segments 30 on the first measurement tube 1 and the second measurement tube 2; and fourth distance plates 9, arranged on the connection parts of the fourth circular arc segments 30 and the second inclined tube segments 28 on the first measurement tube 1 and the second measurement tube 2.
As shown in Fig. 7, four distance plates are respectively composed of two E-shaped plates, two distance plates are located at smooth connection sites of the circular arc segments and the port segments of the measurement tube, two distance plates are located at the smooth connection sites of the inclined tube segments and the circular arc segments of the measurement tube, and a double distance mode is realized by two groups of distance plates, so that the resonant frequency of the measurement tube is higher, the stability is good, and the seismic resistance is strong. Moreover, a plurality of through holes are formed in each distance plate to enable the internal circuit of the shell to penetrate through, which is conducive to the layout of the internal circuit.
The two measurement tubes are simultaneously fixed by the distance plates in a vacuum braze welding manner, so that the measurement tubes are unlikely to deform, the properties of the two measurement tubes are completely the same as much as possible, meanwhile limited twisting and bending necessary for flow measurement are provided, and the positions of the double distance plates on the straight tube segments can be changed to change the resonant frequency of the sensor, so that the positions of the double distance plates on the straight tube segments can be determined according to the designed frequency to reduce the vibration coupling of the internal measurement tubes and reinforce the seismic resistance of the measurement tubes.
Preferably, the mass flow sensor further includes: a first reinforcing sleeve 14, arranged on the connection part of the first port segment 31 of the first measurement tube 1 and the first shunt 12; a second reinforcing sleeve 15, arranged on the connection part of the second port segment 32 of the first measurement tube 1 and the second shunt 13; a third reinforcing sleeve 16, arranged on the connection part of the first port segment 31 of the second measurement tube 2 and the first shunt 12; and a fourth reinforcing sleeve 17, arranged on the connection part of the second port segment 32 of the second measurement tube 2 and the second shunt 13.
Preferably, the first shunt 12 is connected with the first reinforcing sleeve 14 and the third reinforcing sleeve 16 by argon arc welding, the second shunt 13 is connected with the second reinforcing sleeve 15 and the fourth reinforcing sleeve 17 by argon arc welding, the first reinforcing sleeve 14 and the second reinforcing sleeve 15 are welded on the first measurement tube 1 by braze welding, the third reinforcing sleeve 16 and the fourth reinforcing sleeve 17 are welded on the second measurement tube 2 by braze welding, and the first shunt 12 and the second shunt 13 are welded on the shell 34 by argon arc welding.
As shown in Fig. 9 and Fig. 10, preferably, the mass flow sensor further includes:
temperature sensors (not shown in the figures) and fixing parts 21, and the fixing parts 21 are used for fixing the temperature sensors to the first distance plates 6.
The temperature sensors can be directly fixed on the distance plates by the fixing parts of the temperature sensors to sense the temperature change in the sensors more directly, so as to obtain a sensing value closer to an actual temperature in the detection tube to improve the subsequent processing precision.
As shown in Fig. 4, preferably, the mass flow sensor further includes: a supporting beam 18 arranged between the first measurement tube 1 and the second measurement tube 2, and both ends of the supporting beam are welded on the first shunt 12 and the second shunt 13 by argon arc welding and are parallel to the first measurement tube 1 and the second measurement tube 2 for fixing and supporting conducting wires in the shell 34. The supporting beam is used for fixing and supporting the conducting wires, so that the wiring is more convenient, and the internal structure of the shell is trimmed and simplified conveniently.
Preferably, the mass flow sensor further includes: a connection tube 19 and an adapting flange 20, the connection tube 19 is used for connecting the shell 34 and the adapting flange 20, and the adapting flange 20 is sealed with an adapting bolt through a rubber column. The adapting flange is sealed by an extrusion manner of the rubber column and the adapting bolt, so that the sealing effect and the mounting convenience can be improved.
Preferably, the mass flow sensor further includes: a pressure switch 23, arranged on an upper surface of the shell 34 and used for detecting the pressure in the shell 34 and sending a prompt message when the pressure is greater than an early warning threshold.
The pressure switch is mounted on the shell of the sensor to detect the pressure change in the shell of the sensor, and timely early warning can be carried out when the internal pressure is greater to prevent the sensor from being damaged.
As shown in Fig. 11, preferably, a groove is formed in a side face of the shell 34 to improve the overall strength of the shell. The shell 34 is specifically divided into an upper shell and a lower shell to be conveniently dismounted and mounted.
The technical solutions of the present invention have been described above in detail with reference to the accompanying drawings. Considering that a U-shaped tube having a very large curvature is adopted in related technology to generate a larger resistance to the flow of the compressed natural gas, and that the distance elements are few, a higher mechanical quality factor, better stability and stronger seismic resistance are difficult to guarantee. By means of the technical solutions of the present application, when the mass flow of the compressed natural gas is measured, the resistance generated on the compressed natural gas can be reduced, and firm distance detection can be realized to guarantee higher mechanical quality factors, better stability and stronger seismic resistance for the circulation measurement tubes of the compressed natural gas.
Industrial Applicability According to the mass flow sensor provided by the present invention, the included angles between the axial lines of the straight tube segments and the inclined tube segments are set to be obtuse angles, the included angles between the axial lines of the inclined tube segments and the port segments are set to be obtuse angles, and the segments are connected by the circular arc segments, so that the transition is smooth, when the compressed natural gas flows in the measurement tubes, no larger resistance will be generated on the compressed natural gas, when the mass flow of the compressed natural gas is measured, the resistance generated on the compressed natural gas can be reduced, and firm distance detection can be realized to guarantee higher mechanical quality factors, better stability and stronger seismic resistance for the circulation measurement tubes of the compressed natural gas.
Claims (10)
1. A mass flow sensor, used for measuring the mass flow of compressed natural gas, and comprising:
a first measurement tube and a second measurement tube, wherein the first measurement tube and the second measurement tube have the same structure and the same size and are arranged in a shell in parallel, each measurement tube comprises a straight tube segment, a first circular arc segment, a second circular arc segment, a third circular arc segment, a fourth circular arc segment, a first inclined tube segment, a second inclined tube segment, a first port segment and a second port segment, wherein the first circular arc segment, the first inclined tube segment, the third circular arc segment and the first port segment are respectively symmetrical to the second circular arc segment, the second inclined tube segment, the fourth circular arc segment and the second port segment relative to a plane which is vertical to and equally divides the straight tube segment, the first circular arc segment is connected to the straight tube segment, the first inclined tube segment is connected to the first circular arc segment, the third circular arc segment is connected to the first inclined tube segment, the first port segment is connected to the third circular arc segment, the second circular arc segment is connected to the straight tube segment, the second inclined tube segment is connected to the second circular arc segment, the fourth circular arc segment is connected to the second inclined tube segment, the second port segment is connected to the fourth circular arc segment, an included angle between an axial line on which the straight tube segment is located and the axial line on which the first inclined tube segment is located, and the included angle between the axial line on which the first inclined tube segment is located and the axial line on which the first port segment is located are obtuse angles, and the included angle between the axial line on which the straight tube segment is located and the axial line on which the second inclined tube segment is located, and the included angle between the axial line on which the second inclined tube segment is located and the axial line on which the second port segment is located are both obtuse angles;
exciters, arranged on the straight tube segment of the first measurement tube, the straight tube segment of the second measurement tube and the planes which are vertical to and equally divide the straight tube segments;
first detectors, arranged on connection parts of the first circular arc segments and the first inclined tube segments of the first measurement tube and the second measurement tube;
second detectors, arranged on the connection parts of the second circular arc segments and the second inclined tube segments of the first measurement tube and the second measurement tube;
a first shunt, arranged at the outside of the shell and connected with the first port segment;
a second shunt, arranged at the outside of the shell and connected with the second port segment;
a first nut, arranged at the outside of the shell and connected to the first shunt; and a second nut, arranged at the outside of the shell and connected to the second shunt.
a first measurement tube and a second measurement tube, wherein the first measurement tube and the second measurement tube have the same structure and the same size and are arranged in a shell in parallel, each measurement tube comprises a straight tube segment, a first circular arc segment, a second circular arc segment, a third circular arc segment, a fourth circular arc segment, a first inclined tube segment, a second inclined tube segment, a first port segment and a second port segment, wherein the first circular arc segment, the first inclined tube segment, the third circular arc segment and the first port segment are respectively symmetrical to the second circular arc segment, the second inclined tube segment, the fourth circular arc segment and the second port segment relative to a plane which is vertical to and equally divides the straight tube segment, the first circular arc segment is connected to the straight tube segment, the first inclined tube segment is connected to the first circular arc segment, the third circular arc segment is connected to the first inclined tube segment, the first port segment is connected to the third circular arc segment, the second circular arc segment is connected to the straight tube segment, the second inclined tube segment is connected to the second circular arc segment, the fourth circular arc segment is connected to the second inclined tube segment, the second port segment is connected to the fourth circular arc segment, an included angle between an axial line on which the straight tube segment is located and the axial line on which the first inclined tube segment is located, and the included angle between the axial line on which the first inclined tube segment is located and the axial line on which the first port segment is located are obtuse angles, and the included angle between the axial line on which the straight tube segment is located and the axial line on which the second inclined tube segment is located, and the included angle between the axial line on which the second inclined tube segment is located and the axial line on which the second port segment is located are both obtuse angles;
exciters, arranged on the straight tube segment of the first measurement tube, the straight tube segment of the second measurement tube and the planes which are vertical to and equally divide the straight tube segments;
first detectors, arranged on connection parts of the first circular arc segments and the first inclined tube segments of the first measurement tube and the second measurement tube;
second detectors, arranged on the connection parts of the second circular arc segments and the second inclined tube segments of the first measurement tube and the second measurement tube;
a first shunt, arranged at the outside of the shell and connected with the first port segment;
a second shunt, arranged at the outside of the shell and connected with the second port segment;
a first nut, arranged at the outside of the shell and connected to the first shunt; and a second nut, arranged at the outside of the shell and connected to the second shunt.
2. The mass flow sensor of claim 1, wherein the exciters include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube and the second measurement tube by braze welding.
3. The mass flow sensor of claim 1, wherein the first detectors and the second detectors respectively include coils, magnetic steel and fixing brackets, the coils and the magnetic steel are coaxially arranged, and the fixing brackets are respectively welded on the first measurement tube and the second measurement tube by braze welding.
4. The mass flow sensor of claim 1, further comprising:
first distance plates, arranged on the connection parts of the first port segments and the third circular arc segments on the first measurement tube and the second measurement tube;
second distance plates, arranged on the connection parts of the third circular arc segments and the first inclined tube segments on the first measurement tube and the second measurement tube;
third distance plates, arranged on the connection parts of the second port segments and the fourth circular arc segments on the first measurement tube and the second measurement tube; and fourth distance plates, arranged on the connection parts of the fourth circular arc segments and the second inclined tube segments on the first measurement tube and the second measurement tube.
first distance plates, arranged on the connection parts of the first port segments and the third circular arc segments on the first measurement tube and the second measurement tube;
second distance plates, arranged on the connection parts of the third circular arc segments and the first inclined tube segments on the first measurement tube and the second measurement tube;
third distance plates, arranged on the connection parts of the second port segments and the fourth circular arc segments on the first measurement tube and the second measurement tube; and fourth distance plates, arranged on the connection parts of the fourth circular arc segments and the second inclined tube segments on the first measurement tube and the second measurement tube.
5. The mass flow sensor of claim 1, further comprising:
a first reinforcing sleeve, arranged on the connection part of the first port segment of the first measurement tube and the first shunt;
a second reinforcing sleeve, arranged on the connection part of the second port segment of the first measurement tube and the second shunt;
a third reinforcing sleeve, arranged on the connection part of the first port segment of the second measurement tube and the first shunt; and a fourth reinforcing sleeve, arranged on the connection part of the second port segment of the second measurement tube and the second shunt.
a first reinforcing sleeve, arranged on the connection part of the first port segment of the first measurement tube and the first shunt;
a second reinforcing sleeve, arranged on the connection part of the second port segment of the first measurement tube and the second shunt;
a third reinforcing sleeve, arranged on the connection part of the first port segment of the second measurement tube and the first shunt; and a fourth reinforcing sleeve, arranged on the connection part of the second port segment of the second measurement tube and the second shunt.
6. The mass flow sensor of claim 5, wherein the first shunt is connected with the first reinforcing sleeve and the third reinforcing sleeve by argon arc welding, the second shunt is connected with the second reinforcing sleeve and the fourth reinforcing sleeve by argon arc welding, the first reinforcing sleeve and the second reinforcing sleeve are welded on the first measurement tube by braze welding, the third reinforcing sleeve and the fourth reinforcing sleeve are welded on the second measurement tube by braze welding, the first shunt and the second shunt are welded on the shell by argon arc welding, and a groove is formed in a side face of the shell.
7. The mass flow sensor of claim 1, further comprising: temperature sensors and fixing parts, wherein the fixing parts are used for fixing the temperature sensors to the first distance plates.
8. The mass flow sensor of claim 1, further comprising: a supporting beam arranged between the first measurement tube and the second measurement tube, wherein both ends of the supporting beam are welded on the first shunt and the second shunt by argon arc welding and are parallel to the first measurement tube and the second measurement tube for fixing and supporting conducting wires in the shell.
9. The mass flow sensor of any one of claims 1-8, further comprising:
a connection tube and an adapting flange, wherein the connection tube is used for connecting the shell and the adapting flange, and the adapting flange is sealed with an adapting bolt through a rubber column.
a connection tube and an adapting flange, wherein the connection tube is used for connecting the shell and the adapting flange, and the adapting flange is sealed with an adapting bolt through a rubber column.
10. The mass flow sensor of any one of claims 1-8, further comprising:
a pressure switch, arranged on an upper surface of the shell and used for detecting the pressure in the shell and sending a prompt message when the pressure is greater than an early warning threshold.
a pressure switch, arranged on an upper surface of the shell and used for detecting the pressure in the shell and sending a prompt message when the pressure is greater than an early warning threshold.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410642655.9A CN104406645A (en) | 2014-11-07 | 2014-11-07 | Mass flow sensor |
| CN201410642655.9 | 2014-11-07 | ||
| PCT/CN2015/072899 WO2016070527A1 (en) | 2014-11-07 | 2015-02-12 | Mass flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2966940A1 true CA2966940A1 (en) | 2016-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2966940A Abandoned CA2966940A1 (en) | 2014-11-07 | 2015-02-12 | Mass flow sensor |
Country Status (3)
| Country | Link |
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| CN (1) | CN104406645A (en) |
| CA (1) | CA2966940A1 (en) |
| WO (1) | WO2016070527A1 (en) |
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| CN111379532A (en) * | 2018-12-29 | 2020-07-07 | 中国石油大学(华东) | Flow monitoring device and drilling equipment |
| CN113108855A (en) * | 2021-04-13 | 2021-07-13 | 合肥精大仪表股份有限公司 | Mass flow meter based on Coriolis principle |
| CN114812715A (en) * | 2022-03-02 | 2022-07-29 | 沃森测控技术（河北）有限公司 | Coriolis mass flowmeter adopting built-in supporting structure |
| CN115560815B (en) * | 2022-12-06 | 2023-04-07 | 沃森测控技术（河北）有限公司 | Multi-flow tube coriolis flowmeter |
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| US9170143B2 (en) * | 2011-02-23 | 2015-10-27 | Micro Motion, Inc. | Vibrating flow meter having a predetermined resistance ratio to a temperature ratio between the curved tube and the balanced structure |
| US8813576B2 (en) * | 2012-11-28 | 2014-08-26 | Golden Promise Equipment Inc. | Coriolis mass flow meter with micro-bend tubes |
| JP6106761B2 (en) * | 2012-12-17 | 2017-04-05 | マイクロ モーション インコーポレイテッド | Improved vibrometer case |
| CN203132621U (en) * | 2012-12-26 | 2013-08-14 | 重庆川仪自动化股份有限公司 | Coriolis mass flowmeter and measuring tube thereof |
| CN103900652A (en) * | 2012-12-28 | 2014-07-02 | 上海一诺仪表有限公司 | Multi-runner Coriolis mass flowmeter sensor fluid main part |
| CN104101394A (en) * | 2014-07-31 | 2014-10-15 | 北京天辰博锐科技有限公司 | Coriolis mass flow sensor |
| CN204177431U (en) * | 2014-11-07 | 2015-02-25 | 加拿大沃森实业有限公司 | A kind of mass flow sensor |
-
2014
- 2014-11-07 CN CN201410642655.9A patent/CN104406645A/en active Pending
-
2015
- 2015-02-12 WO PCT/CN2015/072899 patent/WO2016070527A1/en active Application Filing
- 2015-02-12 CA CA2966940A patent/CA2966940A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN104406645A (en) | 2015-03-11 |
| WO2016070527A1 (en) | 2016-05-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20170505 |
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| FZDE | Discontinued |
Effective date: 20190212 |
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| FZDE | Discontinued |
Effective date: 20190212 |