Coriolis flowmeter comprising a plurality of measurement areas

Abstract

Disclosed is a Coriolis flowmeter comprising a plurality of measurement areas. The Coriolis flowmeter comprises a flow tube and a flow transmitter. The flow tube comprises at least a first measurement area and a second measurement area. A first driving device and a first measurement device are mounted in the first measurement area, and a second driving device and a second measurement device are mounted in the second measurement area. The first measurement device and the second measurement device are both connected to the flow transmitter so as to transmit measurement values of the first measurement device and the second measurement device to the flow transmitter. The first measurement area uses the Coriolis principle to measure at least one of the mass flow and the density of an internal medium, and the second measurement area and the first measurement area both measure the mass flow and / or the density of the internal medium. Compared with the prior art, in the present invention, measurement values of a same parameter of a medium in a flow tube in two measurement areas are compared, so that a measurement result can be verified online, and a high-precision real-time diagnosis method based on sensor design is provided, thereby avoiding production interruption caused by regular calibration of the Coriolis flowmeter.

Description

Coriolis flowmeter with multiple measuring zones Technical Field

[0001] The present invention relates to the technical field of Coriolis flowmeters, and in particular to a Coriolis flowmeter with multiple measurement zones. Background Art

[0002] A Coriolis flowmeter is a mass flow measurement device based on the Coriolis principle that can also measure medium density. Referring to Figure 1, a Coriolis flowmeter consists of a flow sensor and a flow transmitter. The flow sensor consists of an external structure and an internal structure. The external structure includes the sensor housing and flange.

[0003] Referring to Figure 2, the internal structure includes a flow tube, a drive device, a detection device, and a node plate. The measured medium flows through the flow tube, which is fixed to the sensor housing and through which the flow tube passes. The measurement area is located between the two node plates, and the drive device and detection device are installed on the flow tube in the measurement area. The measurement area undergoes continuous micro-vibrations under the action of the drive device. The detection device detects these micro-vibrations and transmits the vibration information to the flow transmitter. The flow transmitter receives the vibration information and processes it to ultimately determine parameters such as the mass flow rate and density of the measured medium. Existing Coriolis flowmeters typically have only one measurement area.

[0004] During the use of a Coriolis flowmeter, if its accuracy changes, it is not easy to detect without verification through other equipment. To ensure its accuracy and effectiveness, many customers will regularly calibrate the Coriolis flowmeter they use, which greatly increases the user's usage costs and may even cause production interruptions.

[0005] Summary of the Invention

[0006] The present invention provides a Coriolis flowmeter with multiple measurement zones. The flow tube has at least two measurement zones, one of which uses the Coriolis principle to measure both mass flow and density, while the other zone simultaneously measures at least density. Because the same medium is being measured, the measurement results can be verified online by comparing the values ​​in the two zones, without interrupting the production process.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention discloses a Coriolis flowmeter with multiple measurement areas, including a flow tube and a flow transmitter, wherein the flow tube has at least a first measurement area and a second measurement area; the first measurement area is equipped with a first drive device and a first detection device, and the second measurement area is equipped with a second drive device and a second detection device; the first detection device and the second detection device are both connected to the flow transmitter to respectively transmit their respective measurement values ​​to the flow transmitter; the first measurement area uses the Coriolis principle to measure at least one of the mass flow rate and density of the internal medium, and the second measurement area and the first measurement area simultaneously measure the mass flow rate and / or density of the internal medium.

[0009] Preferably, the flow tubes include a plurality of flow tubes, and the material, trajectory, wall thickness, and cross-sectional shape of the plurality of flow tubes are all the same.

[0010] Preferably, the flow tube includes a first section and a second section, the first measurement area is located in the first section, the second measurement area is located in the second section, and the first section and the second section are spliced ​​and connected.

[0011] Preferably, the flow tube includes a connector, and two ends of the connector are respectively connected to the first section and the second section to achieve indirect splicing connection between the first section and the second section.

[0012] Preferably, at least one of the first measuring area and the second measuring area is a straight pipe, so as to measure the viscosity of the medium at the straight pipe position.

[0013] Preferably, the first driving device is fixedly connected to the first detecting device, and the second driving device is fixedly connected to the second detecting device.

[0014] Preferably, the first driving device and the first detecting device are separated from each other, and the second driving device and the second detecting device are separated from each other.

[0015] Preferably, at least one node plate is provided between the first measurement area and the second measurement area.

[0016] Preferably, the parameter measured jointly by the first measurement area and the second measurement area includes the mass flow rate of the medium, and the flow transmitter is used to perform a weighted average calculation on the mass flow measurement values ​​obtained by the first measurement area and the second measurement area; and / or, the parameter measured jointly by the first measurement area and the measurement area includes the density of the medium, and the flow transmitter is used to perform a weighted average calculation on the density measurement values ​​obtained by the first measurement area and the second measurement area.

[0017] Preferably, an alarm threshold is provided in the flow transmitter, so that when the absolute value of the difference between the parameters measured jointly by the first measurement area and the second measurement area is greater than the alarm threshold, the flow transmitter sends an alarm signal.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention is designed with at least two measurement areas on the flow tube, wherein the first measurement area uses the Coriolis principle to measure at least one of the mass flow rate and density of the medium therein, while the second measurement area measures the mass flow rate and / or density of the medium therein simultaneously with the first measurement area. Because the first measurement area and the second measurement area simultaneously measure the same medium, by comparing the measurement values ​​of the same parameter of the medium (e.g., density, mass flow rate) in the two measurement areas, the measurement results of the first measurement area can be verified online, providing a high-precision real-time diagnostic method based on sensor design, avoiding production interruptions caused by regular calibration of the Coriolis flowmeter. In the preferred embodiment of the present invention, the uncertainty of the Coriolis flowmeter can be effectively reduced, and real-time diagnosis can be performed with high precision. It can even simultaneously measure the mass flow rate, density, and viscosity of the medium in the flow tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is a schematic structural diagram of an existing Coriolis flowmeter;

[0022] FIG2 is a schematic diagram of the internal structure of FIG1 ;

[0023] FIG3 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 1 of the present invention;

[0024] FIG4 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 2 of the present invention;

[0025] FIG5 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 3 of the present invention;

[0026] FIG6 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 4 of the present invention;

[0027] FIG7 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 5 of the present invention;

[0028] FIG8 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 6 of the present invention;

[0029] FIG9 is a schematic diagram of a Coriolis flowmeter with multiple measurement zones according to Example 7 of the present invention;

[0030] FIG10 is a partial enlarged view of point Y in FIG9 .

[0031] Description of reference numerals:

[0032] In FIG1 : 101 , flow sensor; 102 , flow transmitter; 1 (L), flange; 1 (R), flange; 11 , sensor housing.

[0033] In Figure 2: 1 (L), flange; 1 (R), flange; 4 driving device; 5 (L) detection device; 5 (R) detection device; 6 (L), node plate; 6 (R), node plate; 7 (L), node plate; 7 (R), node plate.

[0034] In Figure 3 (Example 1): A, first measuring area; B, second measuring area; 1 (L), flange; 1 (R), flange; 2 (L), flow tube; 2 (R), flow tube; 3, sleeve; 4, driving device; 5 (L), detection device; 5 (R), detection device; 6 (L), node plate; 6 (R), node plate; 7 (L), node plate; 7 (R), node plate; 8, driving device; 9 (L), detection device; 9 (R), detection device; 10 (L), node plate; 10 (R), node plate; 11 (L), node plate; 11 (R), node plate.

[0035] In FIG4 (Example 2): A, first measurement area; B, second measurement area; 1(L), flange; 1(R), flange; 2(L), flow tube; 2(R), flow tube; 3, sleeve; 4, driving device; 5(L), detection device; 5(R), detection device; 6(L), node plate; 7(L), node plate; 8, driving device; 9(L), detection device; 9(R), detection device; 10(R), node plate; 11(R), node plate; 2-6(R), node plates;

[0036] In Figure 5 (Example 3): 3-A, first measurement area; 3-B, second measurement area; 3-6 (L), node plate; 3-6 (R), node plate; 3-10 (L), node plate; 3-10 (R), node plate.

[0037] In Figure 6 (Example 4): 4-A, first measurement area; 4-B, second measurement area; 4-4, driving device; 4-5 (L), detection device; 4-5 (R), detection device; 4-8, driving device; 4-9, detection device; 4-10 (L), node plate; 4-10 (R), node plate.

[0038] In FIG7 (Example 5): 5-A, first measurement area; 5-B, second measurement area.

[0039] In FIG8 (Example 6): 6-A, first measurement area; 6-B, second measurement area; 6-2, flow tube; 6-6(L), node plate; 6-6(R), node plate; 6-10(L), node plate; 6-10(R), node plate;

[0040] In Figure 9 (Example 7): 7-A, first measurement area; 7-B, second measurement area; 7-2 (L), flow tube; 7-2 (R), flow tube; 7-6 (L), node plate; 7-6 (R), node plate; 7-10 (L), node plate; 7-10 (R), node plate; 7-12 (L), flow tube; 7-12 (R), flow tube.

[0041] In Figure 10 (Example 7): 7-7, connecting piece. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] The present invention provides a Coriolis flowmeter with multiple measurement zones. The flow tube has at least two measurement zones, one of which uses the Coriolis principle to measure both mass flow and density, while the other zone simultaneously measures at least density. Because the same medium is being measured, the measurement results can be verified online by comparing the values ​​in the two zones, without interrupting the production process.

[0044] Referring to Figures 3 to 10 , this embodiment provides a Coriolis flowmeter having multiple measurement zones, including a flow tube and a flow transmitter. The flow tube has at least a first measurement zone and a second measurement zone; the first measurement zone is equipped with a first drive device and a first detection device, while the second measurement zone is equipped with a second drive device and a second detection device; the first detection device and the second detection device are both connected to the flow transmitter to transmit their respective measured values ​​to the flow transmitter; the first measurement zone (i.e., the primary measurement zone) uses the Coriolis principle to measure at least one of the mass flow rate and density of the internal medium, while the second measurement zone (i.e., the auxiliary measurement zone) measures the mass flow rate and / or density of the internal medium simultaneously with the first measurement zone.

[0045] The operating principle of the Coriolis flowmeter with multiple measuring zones is as follows:

[0046] This embodiment provides at least two measurement zones on the flow tube. The first measurement zone uses the Coriolis principle to measure at least one of the mass flow rate and density of the internal medium, while the second measurement zone measures both the mass flow rate and / or density of the internal medium simultaneously. Specifically, when the first measurement zone measures only the mass flow rate of the internal medium, the second measurement zone simultaneously measures at least the mass flow rate; when the first measurement zone measures only the density of the internal medium, the second measurement zone simultaneously measures at least the density of the internal medium; and when the first measurement zone measures both the mass flow rate and density of the internal medium, the second measurement zone simultaneously measures at least one of the mass flow rate and density of the internal medium.

[0047] Since the first measurement area and the second measurement area measure the same medium at the same time, by comparing the measurement values ​​of the same parameters of the medium (such as density, mass flow) in the two measurement areas, the measurement results of the first measurement area can be verified online, providing a high-precision real-time diagnostic method based on sensor design.

[0048] For example, there may be only one flow tube or multiple flow tubes. When there are multiple flow tubes, the multiple flow tubes are preferably made of the same material, trajectory, wall thickness, and cross-sectional shape.

[0049] For example, the flow tube can be a whole or can be spliced ​​together. When the flow tube is spliced ​​together:

[0050] In one embodiment, the flow tube includes a first section and a second section, the first measurement area is located in the first section, the second measurement area is located in the second section, and the first section and the second section are spliced ​​and connected (for example, by bonding, welding, threading, or snap connection);

[0051] As another case, the flow tube includes a connecting piece, the two ends of which are respectively connected (for example, bonded, welded, threaded, or snap-fitted) to one end of the first section and one end of the second section to achieve indirect splicing connection between the first section and the second section.

[0052] Exemplarily, at least one of the first and second measurement areas is a straight tube, so that a desired natural oscillation is applied by a driving device at the straight tube location, causing the flow tube to twist, thereby measuring the viscosity of the medium within the flow tube. If viscosity measurement is not required, both the first and second measurement areas can be V-shaped.

[0053] For example, the first drive device is fixedly connected to the first detection device, and the second drive device is fixedly connected to the second detection device. It is understandable that the first drive device and the first detection device can also be separated from each other, and the second drive device and the second detection device can also be separated from each other.

[0054] Illustratively, at least one node plate is provided between the first measuring area and the second measuring area, thereby improving the stability of the flow tube and achieving a vibration isolation effect to avoid or minimize mutual influence between vibrations generated by the first drive device and vibrations generated by the second drive device.

[0055] For example, the parameter measured jointly by the first and second measurement areas includes mass flow of the medium, and the flow transmitter is configured to calculate a weighted average of the mass flow measurements obtained in the first and second measurement areas. Alternatively, the parameter measured jointly by the first and second measurement areas includes density of the medium, and the flow transmitter is configured to calculate a weighted average of the density measurements obtained in the first and second measurement areas. The weighted averages of the corresponding parameters are calculated to improve accuracy.

[0056] Exemplarily, an alarm threshold is preset in the flow transmitter (the alarm threshold is greater than zero) so that when the absolute value of the difference between the parameters measured jointly in the first measurement area and the second measurement area is greater than the alarm threshold, the flow transmitter will send an alarm signal to prompt the user that there may be a problem with the Coriolis flowmeter with multiple measurement areas.

[0057] The technical solution of this embodiment will be described in detail below in conjunction with Examples 1 to 8.

[0058] Example 1

[0059] 3 , this embodiment provides a Coriolis flowmeter having multiple measurement zones, wherein:

[0060] The diameter, wall thickness, trajectory, and material of flow tube 2 (L) and flow tube 2 (R) are the same;

[0061] The splitter 1(L) and the splitter 1(R) are both fixed on the sleeve 3;

[0062] Both ends of the flow tube 2 (L) and both ends of the flow tube 2 (R) are connected to the splitters 1 (L) and 1 (R) respectively;

[0063] Node plates 6 (L), 6 (R), 7 (L), 7 (R), 10 (L), 10 (R), 11 (L), 11 (R) are all fixed on the sleeve 3 and are sleeved on the outside of the flow tubes 2 (L) and 2 (R) to achieve the positioning of the flow tubes 2 (L) and 2 (R);

[0064] The area where the flow tubes 2(L) and 2(R) are located between the node plates 6(L) and 6(R) is defined as a first measurement area A. The first measurement area A is provided with a driving device 4, a detection device 5(L), and a detection device 5(R). The first measurement area A uses the Coriolis principle to measure the mass flow rate and density of the medium in the flow tubes 2(L) and 2(R). The detection devices 5(L) and 5(R) are located on either side of the driving device 4, and are independent of the driving device 4.

[0065] The area where the flow tubes 2(L) and 2(R) are located between the node plates 10(L) and 10(R) is defined as a second measurement area B. The second measurement area B is provided with a driving device 8, a detection device 9(L), and a detection device 9(R). The second measurement area B also uses the Coriolis principle to measure the mass flow rate and density of the medium in the flow tubes 2(L) and 2(R). The detection devices 9(L) and 9(R) are located on either side of the driving device 8, and are independent of the driving device 8.

[0066] The first measurement area A and the second measurement area B are both V-shaped, and the portions of the flow tubes 2(L) and 2(R) between the first and second measurement areas are straight. Compared to the two measurement areas, the first measurement area A is a deep V-shaped, while the second measurement area B is a shallow V-shaped, to avoid resonance at the same frequency between the first measurement area A and the second measurement area B.

[0067] In order to prevent the vibration of the first measurement area A from interfering with the vibration of the second measurement area B, node plates 7(L), 7(R), 11(L), and 11(R) are arranged between the first measurement area A and the second measurement area B to isolate the vibration and eliminate interference.

[0068] Example 2

[0069] 4 , this embodiment provides a Coriolis flowmeter having multiple measurement zones, which is substantially the same as that of Embodiment 1, except that:

[0070] The first measurement area A and the second measurement area B are separated by only one node plate 2-6(R); the thickness of the node plate 2-6(R) is greater than the thickness of the node plate 6(R), the node plate 7(R), the node plate 10(L), and the node plate 11(L) in Example 1. Therefore, although the number of node plates is reduced, the stability and vibration isolation effect can also be guaranteed.

[0071] Example 3

[0072] 5 , this embodiment provides a Coriolis flowmeter having multiple measurement zones, wherein:

[0073] The portion of the two flow tubes located between gusset plates 3-6(L) and 3-6(R) forms the first measurement zone 3-A, which is V-shaped. The portion of the two flow tubes located between gusset plates 3-10(L) and 3-10(R) forms the second measurement zone 3-B, which is linear. Each measurement zone has a corresponding drive device and detection device, but the drive and detection devices are not directly connected.

[0074] This embodiment is substantially the same as embodiment 1, except that:

[0075] In this embodiment, the second measurement area 3 -B is linear, while in embodiment 1, the second measurement area B is V-shaped.

[0076] The advantage of this embodiment is that the straight portion is not sensitive to wear and the straight pipe body can reduce pressure loss.

[0077] Example 4

[0078] 6 , this embodiment provides a Coriolis flowmeter having a plurality of measuring zones, wherein a driving device 4-4 and a detecting device 4-5(L) and 4-5(R) are provided in a first measuring zone 4-A, and the portion of the two flow tubes located between the node plates 4-10(L) and 4-10(R) is defined as a second measuring zone 4-B, and a driving device 4-8 and a detecting device 4-9 are provided in the second measuring zone 4-B.

[0079] This embodiment is substantially the same as embodiment 1, except that:

[0080] In this embodiment, the driving device 4 - 8 and the detecting device 4 - 9 are integrated into an integral structure to meet the functional requirements of measuring density.

[0081] Example 5

[0082] 7 , this embodiment provides a Coriolis flowmeter having multiple measurement areas, including a first measurement area 5 -A and a second measurement area 5 -B.

[0083] This embodiment is substantially the same as embodiment 3, except that:

[0084] In the second measurement area 5-B, the driving device and the detection device are integrated into an integral structure to meet the functional requirements of measurement density.

[0085] The driving device of the second measuring area 5-B applies an expected natural oscillation to cause the flow tube to twist, thereby measuring the viscosity of the medium in the flow tube.

[0086] In this way, the first measuring area 5 -A can measure the mass flow rate and density of the medium, and the second measuring area 5 -B can measure the density and viscosity of the medium.

[0087] Example 6

[0088] 8 , this embodiment provides a Coriolis flowmeter having multiple measurement zones, which utilizes a single flow tube 6-2. The portion of the flow tube 6-2 located between the node plate 6-6(L) and the node plate 6-6(R) is the first measurement zone 6-A, and the portion of the flow tube 6-2 located between the node plate 6-10(L) and the node plate 6-10(R) is the second measurement zone 6-B.

[0089] This embodiment uses a single flow tube 6 - 2 , which is suitable for situations where the medium flow rate is relatively small.

[0090] Example 7

[0091] 9 and 10 , this embodiment provides a Coriolis flowmeter having multiple measurement zones, wherein:

[0092] The portion of the flow tubes 7-2(L) and 7-2(R) located between the node plates 7-6(L) and 7-6(R) is the first measurement area 7-A, and the portion of the flow tubes 7-12(L) and 7-12(R) located between the node plates 7-10(L) and 7-10(R) is the second measurement area 7-B.

[0093] The first measurement area 7-A and the second measurement area 7-B both use the Coriolis principle to measure mass flow and density.

[0094] It should be noted that in this embodiment, the flow tube 7-2(L) of the first measurement area 7-A is connected to the flow tube 7-2(L) of the second measurement area 7-B via a connector 7-7, and the flow tube 7-2(R) of the first measurement area 7-A is connected to the flow tube 7-2(R) of the second measurement area 7-B via another connector 7-7. Therefore, the first measurement area 7-A and the second measurement area 7-B can be bent and formed separately, and then connected via the connector 7-7. The material, wall thickness, cross-sectional shape, and other features of the first measurement area 7-A and the second measurement area 7-B can be different, as long as they can be adapted to the end of the connector 7-7. Compared to the technical solutions in Examples 1 to 6 in which the first measurement area and the second measurement area are an integral whole, this embodiment connects the first measurement area 7-A and the second measurement area 7-B via the connector 7-7, which can reduce the difficulty of bending the pipes.

[0095] It can be understood that in addition to the scheme of connecting the first measurement area 7-A and the second measurement area 7-B through the connecting member 7-7, technical personnel in this field can also use bonding or welding (that is, without setting the connecting member 7-7) to connect the first measurement area 7-A and the second measurement area 7-B.

[0096] Example 8

[0097] This embodiment provides a Coriolis flowmeter with multiple measurement areas, which includes a first measurement area and a second measurement area, and the first measurement area and the second measurement area are both V-shaped;

[0098] A driving device is provided at the bottom of the V-shaped structure of the first measuring area, and a detection device is provided on each of the two sides of the V-shaped structure of the first measuring area, and the two detection devices are both facing the inner side of the bend of the V-shaped structure;

[0099] A driving device is provided at the bottom of the V-shaped structure of the second measuring area, and a detection device is provided at each of the two sides of the V-shaped structure of the second measuring area. Both detection devices face the inner side of the bend of the V-shaped structure.

[0100] It should be noted that in Examples 1 to 7, the detection devices in the first measurement zone are all oriented toward the outer side of the V-shaped bend. When the second measurement zone is V-shaped, the detection devices in the second measurement zone are all oriented toward the inner side of the V-shaped bend. Having the detection devices facing outward effectively increases the phase difference of the detection signal, while having the detection devices facing inward makes the structure more compact.

[0101] Depending on actual needs, those skilled in the art can flexibly select the orientation of the detection devices. For example, the detection devices in the first measurement area are all oriented toward the outer side of the bend of the V-shaped structure; when the second measurement area is V-shaped, the detection devices in the second measurement area are all oriented toward the outer side of the bend of the V-shaped structure.

[0102] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A Coriolis flowmeter having multiple measurement zones, comprising a flow tube and a flow transmitter, characterized in that, The flow tube has at least a first measurement area and a second measurement area; a first driving device and a first detection device are installed in the first measurement area, and a second driving device and a second detection device are installed in the second measurement area; both the first detection device and the second detection device are connected to the flow transmitter to respectively transmit their measurement values to the flow transmitter; the first measurement area measures at least one of the mass flow rate and density of the internal medium using the Coriolis principle, and the second measurement area measures the mass flow rate and / or density of the internal medium simultaneously with the first measurement area.

2. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, There are multiple flow tubes, and the materials, trajectories, wall thicknesses, and cross-sectional shapes of the multiple flow tubes are the same.

3. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, The flow tube includes a first section and a second section. The first measurement area is located in the first section, the second measurement area is located in the second section, and the first section and the second section are spliced and connected.

4. The Coriolis flowmeter having a plurality of measurement zones according to claim 3, wherein, The flow tube includes a connecting piece, and both ends of the connecting piece are respectively connected to the first section and the second section to achieve the indirect splicing and connection of the first section and the second section.

5. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, At least one of the first measurement area and the second measurement area is a straight tube to measure the viscosity of the medium at the straight tube position.

6. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, The first driving device is fixedly connected to the first detection device, and the second driving device is fixedly connected to the second detection device.

7. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, The first driving device is separated from the first detection device, and the second driving device is separated from the second detection device.

8. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, At least one node plate is provided between the first measurement area and the second measurement area.

9. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, The parameters jointly measured by the first measurement area and the second measurement area include the mass flow rate of the medium, and the flow transmitter is used to perform a weighted average calculation on the mass flow rate measurement values obtained from the first measurement area and the second measurement area; and / or, the parameters jointly measured by the first measurement area and the measurement area include the density of the medium, and the flow transmitter is used to perform a weighted average calculation on the density measurement values obtained from the first measurement area and the second measurement area.

10. The Coriolis flowmeter having a plurality of measurement zones according to claim 1, characterized in that, An alarm threshold is provided in the flow transmitter, so that when the absolute value of the difference between the parameters jointly measured by the first measurement area and the second measurement area is greater than the alarm threshold, the flow transmitter emits an alarm signal.

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