CN109668599B - Coriolis mass flowmeter - Google Patents
Coriolis mass flowmeter Download PDFInfo
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- CN109668599B CN109668599B CN201910040535.4A CN201910040535A CN109668599B CN 109668599 B CN109668599 B CN 109668599B CN 201910040535 A CN201910040535 A CN 201910040535A CN 109668599 B CN109668599 B CN 109668599B
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- 239000003990 capacitor Substances 0.000 claims description 32
- 238000003825 pressing Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000013011 mating Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
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- 238000003199 nucleic acid amplification method Methods 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
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Classifications
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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
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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
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
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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
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a Coriolis mass flowmeter, which comprises a connecting assembly, wherein the connecting assembly comprises a straight-through pipe and a convex supporting piece, two ends of the straight-through pipe are respectively connected with a flange, and the convex supporting piece is provided with a matching piece; the control assembly comprises a buckling end which is matched with the matching piece for dismounting connection; and the storage component is arranged below the straight-through pipe and internally provided with a measuring coil and a vibrating coil. The circuit adopts the PI control algorithm to ensure that the response speed of the measuring tube is high, and the frequency and the amplitude of the measuring tube can be adjusted in real time according to different measuring media, so that the stable oscillation of the whole closed loop system is realized, and the measuring accuracy and the stability of the flowmeter are greatly improved.
Description
Technical Field
The invention relates to the technical field of flow detection, in particular to a coriolis mass flowmeter and a medium compensation vibration driving circuit in the coriolis mass flowmeter.
Background
The Coriolis mass flowmeter is used for directly measuring the mass flow of fluid, has high measurement accuracy and good repeatability, can simultaneously realize the measurement of multiple parameters such as the volume flow, density, temperature and the like of the fluid and under different fluid conditions, and has wide application prospect. The coriolis mass flowmeter is composed of a primary meter (or mass flow sensor) and a transmitter (or secondary meter). The primary instrument comprises a flow tube, a driving coil, a vibration pickup coil (magneto-electric speed sensor) and a temperature sensor, and the transmitter comprises a signal processing system and a flow tube driving system (short for driving system). The driving system generates a driving signal and provides the driving signal to the driving coil; the drive coil drives the flow tube into vibration. The magneto-electric speed sensor detects the vibration condition of the flow tube and sends the detected vibration information to the signal processing system for processing.
The operating principle of the coriolis mass flowmeter determines that periodic vibration with a fixed frequency and stable amplitude is required to be maintained, and accuracy of measured data can be guaranteed only by good vibration, so that design and control of a vibration circuit are key to flowmeter measurement. The traditional technology for measuring the vibration of the pipeline at present utilizes a positive feedback control circuit formed by analog driving to drive the single and fixed gain and slow dynamic response, so that the vibration of the measuring pipe cannot be changed along with the change of the medium property, and even the vibration is possibly stopped, thereby causing inaccuracy of the measuring result and even incapability of measuring.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above and/or problems occurring in the prior art.
It is, therefore, one of the objects of the present invention to provide a coriolis mass flowmeter.
In order to solve the technical problems, the invention provides the following technical scheme: a coriolis mass flowmeter, comprising.
In order to solve the technical problems, the invention provides the following technical scheme: the Coriolis mass flowmeter comprises a connecting assembly, wherein the connecting assembly comprises a straight-through pipe and a protruding support piece, two ends of the straight-through pipe are respectively connected with a flange, and the protruding support piece is provided with a matching piece; the control assembly comprises a buckling end which is matched with the matching piece for dismounting connection; and the storage component is arranged below the straight-through pipe and internally provided with a measuring coil and a vibrating coil.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the buckling end comprises a clamping ring and a limiting reset piece, and the limiting reset piece is arranged on the outer side of the clamping ring; the cooperation piece is last to be equipped with spacing recess, spacing reset piece with spacing recess cooperation buckle each other connects control assembly with coupling assembling.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the limiting reset piece comprises a fixing buckle and a pressing buckle, the fixing buckle is fixed on the outer side of the clamping ring, and the pressing buckle penetrates through the fixing buckle and penetrates through the clamping ring from outside to inside; the pressing buckle is matched with the limiting groove.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the buckling end further comprises a built-in groove, a positioning protruding block is arranged on the matching piece, the built-in groove is matched with the positioning protruding block, and the matching position of the matching piece and the buckling end is positioned.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the control assembly is provided with a medium compensation vibration driving circuit.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the medium compensation vibration driving circuit comprises a driving power supply circuit, a driving bridge circuit, a constant current source circuit, a signal feedback control circuit and an automatic gain control circuit.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the driving bridge circuit Q4 comprises a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth resistor R11 and a first capacitor C6; the first MOS transistor is used as the eighth pin 8 of the driving bridge circuit Q4, the second MOS transistor is used as the second pin 2 of the driving bridge circuit Q4, the third MOS transistor is used as the fifth pin 5 of the driving bridge circuit Q4, and the fourth MOS transistor is used as the fourth pin 4 of the driving bridge circuit Q4.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the constant current source circuit comprises a second capacitor C7, a sixth resistor R15, a fifth MOS tube Q5, a seventh resistor R17, an eighth resistor R13, a third capacitor C9, a fourth operational amplifier U6A, a ninth resistor R18, a tenth resistor R19, a fifth operational amplifier U4B and a diode D2; the fifth pin 5 of the fifth operational amplifier U4B is connected to the output of the automatic gain control circuit, the eighth pin 8 of the fifth operational amplifier U4B is connected to the second control P46, the sixth pin 6 of the fifth operational amplifier U4B is connected to one end of the seventh resistor R17 and one end of the fifth MOS transistor Q5, the fourth pin 4 of the fifth operational amplifier U4B is grounded, the seventh pin 7 of the fifth operational amplifier U4B is connected to one end of the eighth resistor R13 and the second pin 2 of the fourth operational amplifier U6A, and the other end of the eighth resistor R13 is connected to the first pin 1 of the fifth MOS transistor Q5.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: one end of the ninth resistor R18 is connected with the second control P46, the other end of the ninth resistor R18 is connected with the third pin 3 of the fourth operational amplifier U6A, one end of the tenth resistor R19, and the other end of the tenth resistor R19 is grounded; the first pin 1 of the fourth operational amplifier U6A is connected with the control P45, the eighth pin 8 of the fourth operational amplifier U6A is connected with one end of the third capacitor C9 and the second control P46, and the other end of the third capacitor C9 is grounded; the second pin 2 of the fifth MOS tube Q5 is connected with one end of a seventh resistor R17, the sixth pin 6 of the fifth operational amplifier U4B and one end of a sixth resistor R15, wherein the other end of the seventh resistor R17 is grounded; one end of the second capacitor C7 is connected to one end of the sixth resistor R15, and the other end is connected to the third pin 3 of the fifth MOS transistor Q5, the second pin 2 of the diode D2, and the first pin 1 of the diode D2 is grounded.
As a preferred embodiment of the coriolis mass flowmeter of the present invention, wherein: the automatic gain control circuit comprises a chip U5, an eleventh resistor R20, a twelfth resistor R14, a thirteenth resistor R16, a fourth capacitor C8 and a sixth MOS tube Q6; the first pin 1 and the second pin 2 of the chip U5 are connected to a voltage of 3.3V, the third pin 3 and the fourth pin 4 of the chip U5 are connected to one end of the eleventh resistor R20, the eighth pin 8 of the chip U5 is grounded, the fifth pin 5, the sixth pin 6 and the seventh pin 7 of the chip U5 are connected to control, the other end of the eleventh resistor R20 is connected to the third pin 3 of the sixth MOS transistor Q6, the first pin 1 of the sixth MOS transistor Q6 is connected to control, the second pin 2 of the sixth MOS transistor Q6 is grounded, and the third pin 3 of the sixth MOS transistor Q6 is connected to one end of the twelfth resistor R14 and the other end of the eleventh resistor R20.
The invention has the beneficial effects that: the traditional technology for measuring the vibration of the pipeline is characterized in that a positive feedback control circuit formed by analog driving is utilized for driving the single and fixed gain, the dynamic response is slow, the vibration of the measuring pipe cannot be changed along with the change of the medium property, and even the vibration is possibly stopped, so that the inaccuracy of the measuring result is caused, and even the measurement cannot be carried out. In order to improve vibration control of the measuring tube, the circuit of the invention adopts a PI control algorithm to ensure that the response speed of the measuring tube is high, and the frequency and the amplitude of the measuring tube can be adjusted in real time according to different measuring media, thereby realizing stable oscillation of the whole closed loop system, and greatly improving the measuring accuracy and the measuring stability of the flowmeter. According to the invention, through the design of the flowmeter structure, the core component can be conveniently detached, bolts in each fixing flange are not needed during installation, all bolts can be installed through taking the fixing assembly as a total nut and screwing one bolt through gear transmission, the installation working time is saved, and the disassembly is convenient
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic view showing the overall structure of a coriolis flowmeter according to a first embodiment of the present invention;
FIG. 2 is a schematic view showing the overall structure of the connection assembly of the coriolis flowmeter according to the first embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the partial structure of FIG. 2 of a coriolis flowmeter according to a first embodiment of the present invention;
FIG. 4 is a schematic view showing the overall structure of the control assembly of the coriolis flowmeter according to the first embodiment of the present invention;
FIG. 5 is a schematic diagram showing the overall structure of a circuit diagram of a coriolis flowmeter disposed in a control unit according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram of the signal feedback control circuit of the coriolis flowmeter according to the second embodiment of the present invention;
FIG. 7 is a schematic diagram of the drive bridge circuit of the coriolis flowmeter in a second embodiment of the invention;
FIG. 8 is a schematic diagram of the constant current source circuit of the coriolis flowmeter in a second embodiment of the invention;
FIG. 9 is a schematic diagram of the automatic gain control circuit of the coriolis flowmeter according to a second embodiment of the present invention;
FIG. 10 is a schematic view of the overall structure of a coriolis flowmeter according to a third embodiment of the present invention;
FIG. 11 is an enlarged partial schematic view of the coriolis flowmeter of FIG. 10 in accordance with a third embodiment of the invention;
FIG. 12 is an enlarged partial schematic view of the coriolis flowmeter of FIG. 10 in accordance with a third embodiment of the invention;
FIG. 13 is a schematic view showing the overall structure of the movable ring of the coriolis flowmeter according to the third embodiment of the present invention;
fig. 14 is a schematic view of the overall structure of the buckle of the coriolis flowmeter according to the third embodiment of the present invention;
FIG. 15 is a schematic view showing the whole structure of the fitting buckle of the coriolis flowmeter according to the third embodiment of the present invention
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The mass flowmeter is a flow meter for continuously measuring the flow of a medium to be measured, and the measuring result is a flow meter displayed in engineering units such as kilograms or tons.
Referring to fig. 1 to 4, a coriolis mass flowmeter according to a first embodiment of the present invention is provided, in which a coriolis mass flowmeter body includes a connection assembly 100, a control assembly 200, and a storage assembly 300.
The connection assembly 100 comprises a through pipe 101 and a convex supporting member 102, wherein the convex supporting member 102 is formed by extending upwards from the middle position of the through pipe 101, and the through pipe 101 is communicated with the inside of the convex supporting member 102.
Wherein, two ends of the straight-through pipe 101 are respectively connected with one flange 103, external pipe fittings are connected through the flanges 103, and the flanges 103 at the two ends have the same function, that is, the connecting assembly 100 is connected at the joint of the two pipe fittings, and the measurement is performed.
Preferably, in the present embodiment, the protruding support 102 is provided with a mating piece 102a, the mating piece 102a is provided with a limiting groove 102a-1, and the limiting groove 102a-1 is formed by recessing inwards from the outer surface of the mating piece 102 a.
The control assembly 200 includes a buckling end 201, the buckling end 201 is a lower end buckle of the core processor, the buckling end 201 is matched with and detached from the matching piece 102a, a transmitter is generally connected above the buckling end 201, the transmitter is an electronic system with micro-processing as a core and is used for providing driving force for a sensor, converting signals of the sensor into mass flow signals and other meaningful parameter signals, and meanwhile, the control assembly has the function of compensating and correcting mass flow and density measurement according to temperature parameters. The flow transducer generally outputs standard current signals or frequency signals, can realize crosslinking and remote transmission communication with an upper computer and a DCS system according to a certain communication protocol, and a display panel on the transducer can be configured to display various required parameters. 0043 wherein, the fastening end 201 includes a snap ring 201a and a limiting reset piece 201b, the limiting reset piece 201b is disposed at an outer side of the snap ring 201a, and the limiting reset piece 201b and the limiting groove 102a-1 are mutually matched and fastened to connect the control assembly 200 and the connection assembly 100.
The limiting reset piece 201b and the limiting groove 102a-1 are matched with each other to be buckled in a specific mode that the limiting reset piece 201b also comprises
The fixing buckle 201b-1 is fixed on the outer side of the clamping ring 201a, the pressing buckle 201b-2 penetrates through the fixing buckle 201b-1 and penetrates through the clamping ring 201a from outside to inside, and the pressing buckle 201b-2 is matched with the limiting groove 102 a-1. 0045 in connection with the control assembly 200 and mating tab 102a, an improvement is presented in this embodiment to reduce the time for the spacing reset 201b to align with the spacing groove 102a-1 for better positioning.
Specifically, the fastening end 201 further includes a built-in groove 201c, the built-in groove 201c is formed by recessing inward from the inner surface of the fastening end 201, the engaging piece 102a is provided with a positioning protrusion 102a-2, and the positioning protrusion 102a-2 is formed by protruding outward from the outer periphery (radially-forced outer surface) of the engaging piece 102 a. The built-in groove 201c is matched with the positioning convex block 102a-2, so that the matching position of the matching piece 102a and the buckling end 201 is further determined, the last pressing buckle 201b-2 is matched with the limiting groove 102a-1, and the control assembly 200 is connected with the matching piece 102 a.
The storage assembly 300 is arranged below the straight pipe 101 and internally provided with two measuring coils and a vibrating coil. The two measuring coils are respectively positioned at two symmetrical positions of one measuring tube, and two permanent magnets are fixed at the response position of the other measuring tube. According to the electromagnetic induction principle, alternating potential with relative speed change is formed in a detection coil loop in the vibration process of the measuring tube. When no fluid flows in the measuring tube, the time for the inlet and outlet sides of the measuring tube to pass through the vibration center position is the same, and the phase of alternating potential generated by the measuring tube is the same. When there is fluid flow in the measuring tube, the time for the inlet and outlet sides of the measuring tube to pass through the vibration center is not synchronized, and thus the phase of the alternating potential is different.
Referring to fig. 5 to 9, a second embodiment of the coriolis mass flowmeter of the present invention is provided, which is different from the first embodiment in that: in this embodiment, a medium compensation vibration driving circuit is provided in the control unit 200.
Referring to fig. 5, the medium compensation vibration driving circuit includes a driving power supply circuit, a driving bridge circuit, a constant current source circuit, a signal feedback control circuit, and an automatic gain control circuit.
In this embodiment, an MCU is provided, and is a central controller, and is connected to the pre-amplification acquisition circuit through 6 pins, and is sequentially connected to the signal feedback control circuit, the driving bridge circuit, the constant current source circuit, and the automatic gain control circuit through the pre-amplification acquisition circuit.
Referring to fig. 6, the signal feedback control circuit in the present embodiment includes a first resistor R8, a second resistor R9, a third resistor R10, a fourth resistor R12, a first operational amplifier U3A, a second operational amplifier U3B, and a third operational amplifier U4A. The left end of the pre-amplification acquisition circuit is connected with one end of a third resistor R10, and the other end of the third resistor R10 is connected with a fifth pin 5 of a second operational amplifier U3B. The other end of the third resistor R10 is connected with the signal input 1.
The second pin 2 of the first operational amplifier U3A is connected to the first pin 1 of the first operational amplifier U3A, and the first pin 1 of the first operational amplifier U3A is connected to the sixth pin 6 of the second operational amplifier U3B and the third pin 3 of the third operational amplifier U4A, respectively.
The third pin 3 of the first operational amplifier U3A is shunted to a first resistor R8 and a second resistor R9, one end of the first resistor R8 is connected with the third pin 3 of the first operational amplifier U3A, and the other end is connected with VCC1. One end of the second resistor R9 is connected with the first resistor R8, and the other end of the second resistor R is grounded.
The eighth pin 8 of the second operational amplifier U3B is connected to VCC1, and the seventh pin 7 of the second operational amplifier U3B is connected to the first pin 1 and the eighth pin 8 of the driving bridge circuit Q4.
The second pin 2 of the third operational amplifier U4A is connected to one end of the fourth resistor R12, and the other end of the fourth resistor R12 is connected to the right end of the pre-amplifying and collecting circuit, where the other end of the fourth resistor R12 is connected to the input signal 2, and the first pin 1 of the third operational amplifier U4A is connected to the fourth pin 4 and the fifth pin 5 of the driving bridge circuit Q4.
Referring to fig. 7, the driving bridge circuit Q4 includes a first MOS transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth resistor R11, and a first capacitor C6. The first MOS transistor is used as the eighth pin 8 of the driving bridge circuit Q4, the second MOS transistor is used as the second pin 2 of the driving bridge circuit Q4, the third MOS transistor is used as the fifth pin 5 of the driving bridge circuit Q4, and the fourth MOS transistor is used as the fourth pin 4 of the driving bridge circuit Q4. The seventh pin 7 of the driving bridge circuit Q4 is connected to VCC, the second pin 2 of the driving bridge circuit Q4 is connected to one end of the fifth resistor R11 and the second pin 2 of the component JI, and the other end of the fifth resistor R11 is connected to the other end of the first capacitor C6.
One end of the sixth pin 6 of the driving bridge circuit Q4 is connected to the first capacitor C6 and the first pin 1 of the component JI. The first pin 1 and the eighth pin 8 of the driving bridge circuit Q4 are connected with the seventh pin 7 of the second operational amplifier U3B, the fourth pin 4 and the fifth pin 5 of the driving bridge circuit Q4 are connected with the first pin 1 of the third operational amplifier U4A, and the third pin 3 of the driving bridge circuit Q4 is connected with the third pin 3 of the constant current source output pipe.
Referring to fig. 8, the constant current source circuit includes a second capacitor C7, a sixth resistor R15, a fifth MOS transistor Q5, a seventh resistor R17, an eighth resistor R13, a third capacitor C9, a fourth operational amplifier U6A, a ninth resistor R18, a tenth resistor R19, a fifth operational amplifier U4B, and a diode D2.
The fifth pin 5 of the fifth operational amplifier U4B is connected with the output of the automatic gain control circuit, the eighth pin 8 of the fifth operational amplifier U4B is connected with the second control P46, the sixth pin 6 of the fifth operational amplifier U4B is connected with one end of the seventh resistor R17 and one end of the fifth MOS tube Q5, the fourth pin 4 of the fifth operational amplifier U4B is grounded, the seventh pin 7 of the fifth operational amplifier U4B is connected with one end of the eighth resistor R13 and the second pin 2 of the fourth operational amplifier U6A, and the other end of the eighth resistor R13 is connected with the first pin 1 of the fifth MOS tube Q5.
One end of the ninth resistor R18 is connected with the other end of the second control P46 and is connected with the third pin 3 of the fourth operational amplifier U6A and one end of the tenth resistor R19, and the other end of the tenth resistor R19 is grounded.
The first pin 1 of the fourth operational amplifier U6A is connected with the control P45, the eighth pin 8 of the fourth operational amplifier U6A is connected with one end of the third capacitor C9, the second pin is connected with the second control P46, and the other end of the third capacitor C9 is grounded.
The second pin 2 of the fifth MOS transistor Q5 is connected to one end of the seventh resistor R17, the sixth pin 6 of the fifth operational amplifier U4B, and one end of the sixth resistor R15, where the other end of the seventh resistor R17 is grounded.
One end of the second capacitor C7 is connected to one end of the sixth resistor R15, and the other end is connected to the third pin 3 of the fifth MOS transistor Q5, the second pin 2 (negative electrode) of the diode D2, and the first pin 1 (positive electrode) of the diode D2 is grounded.
Referring to fig. 9, an automatic gain control circuit includes a chip U5, an eleventh resistor R20, a twelfth resistor R14, a thirteenth resistor R16, a fourth capacitor C8, and a sixth MOS transistor Q6.
The first pin 1 and the second pin 2 of the chip U5 are connected with 3.3V voltage, the third pin 3 and the fourth pin 4 of the chip U5 are connected with one end of an eleventh resistor R20, the eighth pin 8 of the chip U5 is grounded, the fifth pin 5, the sixth pin 6 and the seventh pin 7 of the chip U5 are connected with control, the other end of the eleventh resistor R20 is connected with the third pin 3 of a sixth MOS tube Q6, the first pin 1 of the sixth MOS tube Q6 is connected with control, the second pin 2 of the sixth MOS tube Q6 is grounded, and the third pin 3 of the sixth MOS tube Q6 is connected with one end of a twelfth resistor R14 and the other end of the eleventh resistor R20. The other end of the twelfth resistor R14 is connected with one end of the thirteenth resistor R16 and one end of the fourth capacitor C8. The other end of the thirteenth resistor R16 and one end of the fourth capacitor C8 are grounded, and the other end of the fourth capacitor C8 is connected with the fifth pin 5 of the fifth operational amplifier U4B.
Referring to fig. 10 to 15, a third embodiment provided for the coriolis mass flowmeter of the present invention is different from the second embodiment in that: the coriolis mass flowmeter further includes a securing assembly 400 that facilitates securing the coriolis mass flowmeter flange 103 to the tube 500.
The fixing assembly 400 comprises a buckle 401 and a jogged buckle 402, one end of the buckle 401 is hinged with one end of the jogged buckle 402, and the other ends of the buckle 401 and the jogged buckle are matched with each other.
The buckle 401 includes a fitting groove 401a, a moving ring 401b, a limiting groove 401c and a limiting hole 401d, wherein the fitting groove 401a is disposed at one end of the buckle 401, and the moving ring 401b is buckled into the fitting groove 401a, so that the moving ring 401b moves up and down in the fitting groove 401 a. The movable ring 401b is provided therein with a return spring 401b-1 and an ejector 401b-2, preferably, the return spring 401b-1 is provided in two, on both sides of the inside of the movable ring 401b, and the ejector 401b-2 is provided in the center of the movable ring 401b, which interacts with the fitting buckle 402. The eject block 401b-2 corresponds to the stopper hole 401d, and when the moving ring 401b moves along the stopper groove 401c, the eject block 401b-2 falls into the stopper hole 401 d.
Wherein, the jogged knot 402 includes embedded part 402c, locating hole 402a and location movable block 402b, and locating hole 402a and location movable block 402b are all arranged in embedded part 402c, and location movable block 402b is arranged in locating hole 402a, and location movable block 402b includes protruding piece and spring.
When the buckle 401 and the fitting buckle 402 are fitted to each other, the fitting portion 402c is inserted into the fitting groove 401a, and the positioning movable block 402b is inserted into the stopper hole 401d, and at this time, the buckle 401 and the fitting buckle 402 are stopped from each other. When the movable ring 401b is required to be disassembled, the ejecting block 401b-2 ejects the positioning movable block 402b out of the limiting hole 401d, and the buckle 401 and the jogging buckle 402 are opened. 0071 is to be noted that, the fixing assembly 400 is provided with holes corresponding to the flange 103, and the holes are all threaded holes, that is, the fixing assembly 400 corresponds to a nut when the flange end of the pipe 500 is engaged with the flange 103.
It should be noted that in this embodiment, the flange 103 of the flowmeter is provided with pins, and a plurality of gears (each of which fixes a gear) are fixed by a plurality of pins, and the gears can rotate relative to the pins but cannot move up and down, wherein the number of the fixed gears is equal to the number of intervals between the fixed holes on the flange.
The tail end of the bolt used in the present embodiment is provided with a gear, and the gear of the bolt is matched with the gear fixed by the pin, so in the present embodiment, all bolts can be screwed and matched with the fixing assembly 400 at the same time by rotating one bolt to match with the fixing assembly 400.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (2)
1. A coriolis mass flowmeter, characterized in that: comprising the steps of (a) a step of,
the connecting assembly (100) comprises a straight-through pipe (101) and a protruding support piece (102), wherein two ends of the straight-through pipe (101) are respectively connected with a flange (103), and the protruding support piece (102) is provided with a matching piece (102 a);
the control assembly (200) comprises a buckling end (201), and the buckling end (201) is matched with the matching piece (102 a) to be detachably connected;
a storage component (300) which is arranged below the straight-through pipe (101) and is internally provided with a measuring coil and a vibrating coil,
the buckling end (201) comprises a clamping ring (201 a) and a limiting reset piece (201 b), and the limiting reset piece (201 b) is arranged on the outer side of the clamping ring (201 a); the device is characterized in that a limit groove (102 a-1) is formed in the matching piece (102 a), the limit reset piece (201 b) is buckled with the limit groove (102 a-1) in a matched mode, the control assembly (200) and the connecting assembly (100) are connected, the limit reset piece (201 b) comprises a fixing buckle (201 b-1) and a pressing buckle (201 b-2), the fixing buckle (201 b-1) is fixed on the outer side of the clamping ring (201 a), and the pressing buckle (201 b-2) penetrates through the fixing buckle (201 b-1) and penetrates through the clamping ring (201 a) from outside to inside; the pressing buckle (201 b-2) is matched with the limiting groove (102 a-1), the buckling end (201) further comprises a built-in groove (201C), a positioning protruding block (102 a-2) is arranged on the matching piece (102 a), the built-in groove (201C) is matched with the positioning protruding block (102 a-2), the matching piece (102 a) and the buckling end (201) are positioned at the matching position, the control component (200) is provided with a medium compensation vibration driving circuit, the medium compensation vibration driving circuit comprises a driving power supply circuit, a driving bridge circuit, a constant current source circuit, a signal feedback control circuit and an automatic gain control circuit, and the driving bridge circuit (Q4) comprises a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a fifth resistor (R11) and a first capacitor (C6);
the first MOS tube is used as an eighth pin (8) of the driving bridge circuit (Q4), the second MOS tube is used as a second pin (2) of the driving bridge circuit (Q4), the third MOS tube is used as a fifth pin (5) of the driving bridge circuit (Q4), the fourth MOS tube is used as a fourth pin (4) of the driving bridge circuit (Q4), a seventh pin (7) of the driving bridge circuit (Q4) is connected with VCC, the second pin (2) of the driving bridge circuit (Q4) is connected with one end of a fifth resistor (R11) and the second pin (2) of a component (JI), and the other end of the fifth resistor (R11) is connected with the other end of the first capacitor (C6);
the constant current source circuit comprises a second capacitor (C7), a sixth resistor (R15), a fifth MOS tube (Q5), a seventh resistor (R17), an eighth resistor (R13), a third capacitor (C9), a fourth operational amplifier (U6A), a ninth resistor (R18), a tenth resistor (R19), a fifth operational amplifier (U4B) and a diode (D2);
the fifth pin (5) of the fifth operational amplifier (U4B) is connected with the output of the automatic gain control circuit, the seventh pin (7) of the fifth operational amplifier (U4B) is connected with the second control (P46), the sixth pin (6) of the fifth operational amplifier (U4B) is connected with one end of a seventh resistor (R17) and one end of a fifth MOS tube (Q5), the fourth pin (4) of the fifth operational amplifier (U4B) is grounded, the seventh pin (7) of the fifth operational amplifier (U4B) is connected with one end of an eighth resistor (R13) and the second pin (2) of the fourth operational amplifier (U6A), and the other end of the eighth resistor (R13) is connected with the first pin (1) of the fifth MOS tube (Q5); one end of the ninth resistor (R18) is connected with the second control (P46), the other end of the ninth resistor is connected with the third pin (3) of the fourth operational amplifier (U6A) and one end of the tenth resistor (R19), and the other end of the tenth resistor (R19) is grounded; the first pin (1) of the fourth operational amplifier (U6A) is connected with the control (P45), the seventh pin (7) of the fourth operational amplifier (U6A) is connected with one end of the third capacitor (C9) and is connected with the second control (P46), and the other end of the third capacitor (C9) is grounded; the second pin (2) of the fifth MOS tube (Q5) is connected with one end of a seventh resistor (R17), the sixth pin (6) of the fifth operational amplifier (U4B) and one end of a sixth resistor (R15), wherein the other end of the seventh resistor (R17) is grounded;
one end of the second capacitor (C7) is connected with one end of the sixth resistor (R15), the other end of the second capacitor is connected with the third pin (3) of the fifth MOS tube (Q5) and the second pin (2) of the diode (D2), and the first pin (1) of the diode (D2) is grounded.
2. The coriolis mass flowmeter of claim 1, wherein: the automatic gain control circuit comprises a chip (U5), an eleventh resistor (R20), a twelfth resistor (R14), a thirteenth resistor (R16), a fourth capacitor (C8) and a sixth MOS tube (Q6);
the first pin (1) and the second pin (2) of the chip (U5) are connected with 3.3V voltage, the third pin (3) and the fourth pin (4) of the chip (U5) are connected with one end of an eleventh resistor (R20), the seventh pin (7) of the chip (U5) is grounded, the fifth pin (5), the sixth pin (6) and the seventh pin (7) of the chip (U5) are connected with control, the other end of the eleventh resistor (R20) is connected with the third pin (3) of a sixth MOS tube (Q6), the first pin (1) of the sixth MOS tube (Q6) is connected with control, the second pin (2) of the sixth MOS tube (Q6) is grounded, the third pin (3) of the sixth MOS tube (Q6) is connected with one end of a twelfth resistor (R14), the other end of the eleventh resistor (R20), the other end of the twelfth resistor (R14) is connected with one end of a thirteenth resistor (R16), one end of a fourth capacitor (C8), and the other end of the thirteenth resistor (R16) is connected with the other end of the fourth capacitor (C8) and the fourth capacitor (C8) is connected with the fifth capacitor (C8).
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| CN201910040535.4A CN109668599B (en) | 2019-01-16 | 2019-01-16 | Coriolis mass flowmeter |
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| CN201910040535.4A CN109668599B (en) | 2019-01-16 | 2019-01-16 | Coriolis mass flowmeter |
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| CN209656114U (en) * | 2019-01-16 | 2019-11-19 | 江苏华海测控技术有限公司 | A kind of Coriolis mass flowmeter |
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| US10386218B2 (en) * | 2016-11-22 | 2019-08-20 | Rota Yokogawa Gmbh & Co. Kg | Temperature measurement system for measuring the temperature of a tube and flowmeter comprising the temperature measurement system |
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| US5321991A (en) * | 1991-08-01 | 1994-06-21 | Micro Motion Incorporated | Coriolis effect mass flowmeter |
| CN1737506A (en) * | 2005-07-13 | 2006-02-22 | 合肥工业大学 | Low cost intelligent vortex shedding flowmeter signal processing system based on DSP |
| US7060900B1 (en) * | 2006-01-24 | 2006-06-13 | Arlington Industries, Inc. | Snap engagement electrical fitting with flangeless connector body |
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| CN109668599A (en) | 2019-04-23 |
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