Single-tube coriolis flowmeter

Abstract

The utility model belongs to the field of measurement, and relates to a single-tube type Coriolis flowmeter which comprises a shell, a measuring tube, a driving assembly and a measuring assembly, and the measuring tube, the driving assembly and the measuring assembly are all arranged in the shell. The measuring tube is a single tube; the driving assembly and the measuring assembly are respectively arranged on the measuring tube; the driving assembly drives the measuring tube to vibrate. The utility model provides the single-tube type Coriolis flowmeter which is convenient to process, high in measurement precision and capable of generating larger Coriolis force under the condition of smaller amplitude.

Description

Technical Field

[0001] This utility model belongs to the field of metrology and relates to a flow meter, and more particularly to a single-tube Coriolis flow meter. Background Technology

[0002] Currently, most flow meters on the market are dual-tube flow meters, but dual-tube flow meters have many shortcomings:

[0003] First, dual-tube flow meters have numerous components and welding points. Welding causes stress changes in the measuring tube at the weld points, leading to slight pipe displacement. Therefore, the more welding points there are, the higher the uncontrollability of the natural frequency of the measuring tube. Second, dual-tube flow meters require a very high degree of similarity between the two measuring tubes. Different degrees of bending in the two tubes result in different vibration frequencies, placing high demands on the pipe bending process. Furthermore, the vibration mode of most current dual-tube flow meters on the market is based on electromagnetic fields generated by electromagnetic coils, such as... Figure 1 As shown, the magnet causes the measuring tube to move in a very flat elliptical path, which is approximately a linear reciprocating motion. However, a very standard linear reciprocating motion does not involve rotation, that is, there is no rotating reference frame.

[0004] However, the Coriolis force has three components: the object's inertia, the characteristics of the rotating system, and the change in velocity direction. Regarding the object's inertia, an object possesses the property of maintaining its original state of motion, i.e., inertia. A particle moving in a straight line within a rotating system tends to continue moving in its original direction of motion due to inertia. Regarding the characteristics of the rotating system: the system itself is constantly rotating, therefore the position of particles within the system changes over time. Regarding the change in velocity direction: due to the inertia of the object moving within the rotating system, and the rotational characteristics of the system itself, the original tendency of the particle's motion (observed from the perspective of the rotating system) will deviate to some extent. This deviation is actually due to a change in the object's trajectory relative to the rotating system, and the observer introduces the hypothetical Coriolis force to explain this phenomenon. If the medium inside the pipe is in a standard linear reciprocating motion perpendicular to the flow direction, there is no rotating system in the medium's range, meaning there is no Coriolis force. However, the pipe is actually in a very flat elliptical circular motion that is approximately straight, which can generate a small Coriolis force. According to the principle of Coriolis force formation, when the major axis of the ellipse in the same amplitude elliptical motion is equal to the radius of the circle in the circular motion, the Coriolis force generated by the circular motion is greater. Utility Model Content

[0005] In order to solve the above-mentioned technical problems in the background art, the present invention provides a single-tube Coriolis flow meter that is easy to process, has high measurement accuracy, and generates a larger Coriolis force when the amplitude is small.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A single-tube Coriolis flow meter, characterized in that: the single-tube Coriolis flow meter includes a housing and a measuring tube, a drive assembly, and a measuring component, all disposed inside the housing; the measuring tube is a single tube; the drive assembly and the measuring component are respectively disposed on the measuring tube; the drive assembly drives the measuring tube to vibrate.

[0008] The aforementioned measuring tube includes an inlet section, a spiral tube, and an outlet section connected sequentially from front to back; the inlet section and the outlet section respectively penetrate the housing from the outside of the housing; the spiral tube is disposed inside the housing; the driving assembly and the measuring assembly are respectively disposed on the spiral tube.

[0009] The spiral tube has at least three turns; the driving component and the measuring component are respectively arranged on different turns of the spiral tube.

[0010] Each turn of the spiral tube described above includes a horizontal tube and a surrounding tube; the driving assembly and the measuring assembly are respectively mounted on the horizontal tube; the axial direction of the horizontal tube is perpendicular to the axial direction of the measuring assembly.

[0011] The number of the aforementioned measuring components is less than the number of turns of the spiral tube; the axial direction of the horizontal tube is perpendicular to the axial direction of the line connecting the measuring components.

[0012] The aforementioned measuring components include a detection element and a follower element disposed opposite to the detection element; the detection element is fixedly disposed inside the housing; the follower element is disposed on the horizontal tube of the spiral tube and vibrates synchronously with the horizontal tube.

[0013] The aforementioned testing components include an outlet tube, a testing plate, and a laser vibration sensor; the laser vibration sensor is mounted on the testing plate; the axial direction of the horizontal tube is perpendicular to the axial direction of the testing plate; the testing plate is connected to the outlet tube; the outlet tube is fixed inside the housing and extends out from inside the housing; the laser vibration sensor is positioned opposite to the follower.

[0014] The aforementioned follower includes a reflective shell, a vibrating swing arm, and a vibrating sleeve; the vibrating sleeve is fitted onto the outside of the horizontal tube and is fixedly connected to the horizontal tube; the vibrating sleeve is connected to the reflective shell through the vibrating swing arm; the reflective shell is U-shaped in general; the laser vibration sensor is positioned opposite to the reflective shell and extends into the reflective shell along the axial direction of the vibrating swing arm.

[0015] The aforementioned drive assembly includes a fixed rod, a stator, electromagnets, and a rotor; the stator is generally ring-shaped; there are multiple electromagnets, which are evenly distributed along the axial direction of the stator on the inner wall of the stator; adjacent electromagnets are not in contact; the rotor includes a rotating ring and a rotor ball connected to the rotating ring; the rotating ring is fitted onto the outside of the helical tube and is rotatably connected to the helical tube; the rotor ball is placed inside the stator and rotates around the axial direction of the helical tube; the stator is mounted inside the housing via the fixed rod; the rotor drives the helical tube to vibrate synchronously when rotating.

[0016] The aforementioned housing includes an upper housing and a lower housing that is engaged with the upper housing.

[0017] The advantages of this utility model are:

[0018] This invention provides a single-tube Coriolis flow meter, comprising a housing and a measuring tube, a drive assembly, and a measuring component, all disposed within the housing. The measuring tube is a single tube; the drive assembly and the measuring component are respectively disposed on the measuring tube; the drive assembly drives the measuring tube to vibrate. The single-tube Coriolis flow meter provided by this invention has only one measuring tube and no fluid divider, solving the problems of uneven flow distribution, pipe stress deformation caused by excessive welding points, and the influence of the magnetic field of the drive component on the detection component. Simultaneously, the measuring tube includes multiple spiral coils, which can change the fluid flow direction multiple times, thereby increasing the flow-induced vibration of the measuring tube and resulting in a more significant amplitude throughout the measuring tube. Furthermore, the drive assembly used in this invention employs a stator and rotor design. Compared to the traditional magnet and coil method, which can only achieve linear reciprocating vibration and only partially overlaps with the circular motion generated by the Coriolis force, resulting in a smaller Coriolis force generated by the medium in the pipe, this invention can achieve periodic circular motion of the measuring tube, allowing the medium inside the measuring tube to generate a larger Coriolis force with a smaller amplitude. Attached Figure Description

[0019] Figure 1 The schematic diagram shows the driving method of the dual-tube flowmeter used in existing technology.

[0020] Figure 2 This is a schematic diagram of the overall structure of the single-tube Coriolis flowmeter provided by this utility model;

[0021] Figure 3 This is a cross-sectional structural schematic diagram of the single-tube Coriolis flow meter provided by this utility model;

[0022] Figure 4 This is a bottom view of the single-tube Coriolis flowmeter provided by this utility model.

[0023] Figure 5This is a schematic diagram of the drive component used in this utility model;

[0024] Figure 6 This is a schematic diagram of the measuring component used in this utility model;

[0025] Figure 7 This is a front view structural schematic diagram of the single-tube Coriolis flow meter provided by this utility model;

[0026] Figure 8 This is a schematic diagram of the overall structure of the measuring tube used in this utility model;

[0027] in:

[0028] 1-Upper housing; 2-Lower housing; 3-Measuring tube; 31-Inlet section; 32-Spiral tube; 33-Outlet section; 4-Outlet tube; 5-Measuring assembly; 51-Detection plate; 52-Laser vibration sensor; 53-Reflective shell; 54-Vibration swing arm; 55-Vibration sleeve; 6-Drive assembly; 61-Fixing rod; 62-Stator; 63-Electromagnet; 64-Rotor. Detailed Implementation

[0029] See Figure 2 , Figure 3 as well as Figure 7 This utility model provides a single-tube Coriolis flow meter, including a housing and a measuring tube 3, a drive assembly 6 and a measuring assembly 5, all disposed inside the housing; the measuring tube 3 is a single tube; the drive assembly 6 and the measuring assembly 5 are respectively disposed on the measuring tube 3; the drive assembly 6 drives the measuring tube 3 to vibrate.

[0030] See Figure 3 , Figure 4 as well as Figure 8 The measuring tube 3 used in this invention is a single tube, which can be bent according to existing technology, facilitating processing and reducing welding points. The measuring tube 3 used in this invention includes an inlet section 31, a spiral tube 32, and an outlet section 33 connected sequentially from front to back; the inlet section 31 and the outlet section 33 respectively penetrate the housing from the outside; the spiral tube 32 is disposed inside the housing; the drive assembly 6 and the measuring assembly 5 are respectively disposed on the spiral tube 32. See also... Figure 3 , Figure 4 as well as Figure 8 The spiral tube 32 has at least two turns; the drive assembly 6 and the measuring assembly 5 are respectively arranged on different turns of the spiral tube 32. The spiral tube 32 exists in a multi-turn manner, and its function is to change the fluid flow direction multiple times, thereby increasing the flow-induced vibration of the fluid on the measuring tube 3, so that the entire measuring tube 3 will have a more obvious amplitude.

[0031] For example, the spiral tube 32 used in this invention has 5 turns in total. The first, second, fourth, and fifth turns are all full turns, while the third turn is a half turn, which facilitates the installation and fixation of the drive component 6. It should be noted that the half turn mentioned here refers to a half turn where the area formed by its winding is less than the area formed by a full turn; for example, it could be half the area formed by a full turn. See also... Figure 8 Each turn of the spiral tube 32 includes a horizontal tube and a surrounding tube; the drive assembly 6 and the measuring assembly 5 are respectively mounted on the horizontal tube. The flow meter is connected to the external pipeline by welding the inlet and outlet sections of the measuring tube. If it is not perpendicular, the vibration axis generated by the horizontal tube during its circular motion will form a non-90-degree angle with the axis of the flow meter inlet and outlet, resulting in vibration that is not coplanar with the plane of the line connecting the inlet and outlet of the measuring tube. This will reduce the stability of the flow meter and thus reduce the measurement accuracy. Therefore, the axis of the horizontal tube used in this invention is perpendicular to the axis of the measuring assembly 5.

[0032] See Figure 3 , Figure 4 as well as Figure 6 The number of measuring components 5 used in this invention is less than the number of turns of the spiral tube 32; the axis of the horizontal tube is perpendicular to the axis of the line connecting the measuring components 5. For example, see [link to example]. Figure 8 This utility model uses a spiral tube with 32 turns of 5, while see [reference needed]. Figure 6 The present invention uses 4 sets of measuring components 5, and the spiral ring 32 without measuring components is occupied by the driving component 6.

[0033] See Figure 6The measuring component 5 used in this invention includes a detection element and a follower element disposed opposite to the detection element. The detection element is fixedly disposed inside the housing. The follower element is disposed on the horizontal tube of the spiral tube 32 and vibrates synchronously with the horizontal tube. The detection element includes an outlet tube 4, a detection plate 51, and a laser vibration sensor 52. The laser vibration sensor 52 is disposed on the detection plate 51. The axial direction of the horizontal tube is perpendicular to the axial direction of the detection plate 51. The detection plate 51 is connected to the outlet tube 4. The outlet tube 4 is fixed inside the housing and extends out from inside the housing. The laser vibration sensor 52 is disposed opposite to the follower element. The follower element includes a reflective shell 53, a vibrating swing rod 54, and a vibrating sleeve 55. The vibrating sleeve 55 is fitted onto the outside of the horizontal tube and fixedly connected to the horizontal tube. The vibrating sleeve 55 is connected to the reflective shell 53 through the vibrating swing rod 54. The reflective shell 53 is U-shaped. The laser vibration sensor 52 is positioned opposite to the reflective shell 53 and extends into the reflective shell 53 along the axial direction of the vibrating swing rod 54. The function of the vibrating pendulum 54 is to amplify the pipe amplitude, making the pipe amplitude detection more accurate. For example, the laser vibration sensor 52 is a triaxial laser vibration sensor. In the measurement process, each laser vibration sensor 52 detects its corresponding spiral tube 32. The data from the first detection group corresponds to the data from the fourth detection group, and the data from the second detection group corresponds to the data from the third detection group, thus eliminating the influence of unexpected vibrations. Simultaneously, the average value of the four detection groups is selected to improve detection accuracy. The measuring tube 3 used in this invention is a centrally symmetric geometric body, with the center of symmetry at the position where the rotor is fixed. That is, the length of the measuring tube on both sides of the rotor is the same, but the distance of the measuring tube from the fixed end at the inlet / outlet is different, resulting in different amplitudes. The first and fourth detection groups are equidistant from their respective fixed ends, and have the same amplitude; therefore, their vibration data can be mutually referenced.

[0034] See Figure 3 , Figure 4 , Figure 5 as well as Figure 8The drive assembly 6 used in this invention includes a fixed rod 61, a stator 62, an electromagnet 63, and a rotor 64. The stator 62 is generally ring-shaped. There are multiple electromagnets 63, which are evenly distributed along the axial direction of the stator 62 on the inner wall of the stator 62. Adjacent electromagnets 63 are not in contact. The rotor 64 includes a rotating ring and a rotor ball connected to the rotating ring. The rotating ring is fitted outside the spiral tube 32 and is rotatably connected to the spiral tube 32. The rotor ball is placed inside the stator 62 and rotates around the axial direction of the spiral tube 32. The stator 62 is set inside the housing by the fixed rod 61. The periodic energization of the electromagnet 63 can drive the rotor 61 to rotate around the axial direction of the spiral tube 32. When the rotor 64 rotates, it drives the spiral tube 32 to vibrate synchronously. The drive assembly used in this invention employs a stator and rotor. Compared to the traditional magnet and coil method, which can only achieve linear reciprocating vibration and only partially overlaps with the circular motion generated by the Coriolis force, the Coriolis force generated by the medium inside the pipe is relatively small. This invention can achieve the periodic circular motion of the measuring tube, enabling the medium inside the measuring tube to generate a larger Coriolis force with a smaller amplitude.

[0035] See Figure 2 as well as Figure 7 The housing used in this utility model includes an upper housing 1 and a lower housing 2 that is fastened to the upper housing 1. Of course, in addition to the fastening connection method, it can also be an embedded, tenon and mortise or bolt connection, which are all conventional technologies and will not be described in detail here.

Claims

1. A single-tube Coriolis flow meter, characterized in that: The single-tube Coriolis flow meter includes a housing and a measuring tube (3), a drive assembly (6), and a measuring assembly (5) all disposed inside the housing; the measuring tube (3) is a single tube; the drive assembly (6) and the measuring assembly (5) are respectively disposed on the measuring tube (3); the drive assembly (6) drives the measuring tube (3) to vibrate.

2. The single-tube Coriolis flow meter according to claim 1, characterized in that: The measuring tube (3) includes an inlet section (31), a spiral tube (32), and an outlet section (33) connected sequentially from front to back; the inlet section (31) and the outlet section (33) pass through the shell from the outside of the shell; the spiral tube (32) is disposed inside the shell; the driving component (6) and the measuring component (5) are disposed on the spiral tube (32).

3. The single-tube Coriolis flow meter according to claim 2, characterized in that: The spiral tube (32) has at least two turns; the driving component (6) and the measuring component (5) are respectively arranged on different turns of the spiral tube (32).

4. The single-tube Coriolis flow meter according to claim 3, characterized in that: Each turn of the spiral tube (32) includes a horizontal tube and a surrounding tube; the driving component (6) and the measuring component (5) are respectively disposed on the horizontal tube; the axial direction of the horizontal tube is perpendicular to the axial direction of the measuring component (5).

5. The single-tube Coriolis flow meter according to claim 4, characterized in that: The number of measuring components (5) is less than the number of turns of the spiral tube (32); the axis of the horizontal tube is perpendicular to the axis of the line connecting the measuring components (5).

6. The single-tube Coriolis flow meter according to claim 5, characterized in that: The measuring component (5) includes a detection element and a follower element disposed opposite to the detection element; the detection element is fixedly disposed inside the housing; the follower element is disposed on the horizontal tube of the spiral tube (32) and vibrates synchronously with the horizontal tube.

7. The single-tube Coriolis flow meter according to claim 6, characterized in that: The detection components include an outlet tube (4), a detection plate (51), and a laser vibration sensor (52); the laser vibration sensor (52) is mounted on the detection plate (51); the axis of the horizontal tube is perpendicular to the axis of the detection plate (51); the detection plate (51) is connected to the outlet tube (4); the outlet tube (4) is fixed inside the housing and extends out from inside the housing; the laser vibration sensor (52) is positioned opposite to the follower.

8. The single-tube Coriolis flow meter according to claim 7, characterized in that: The follower includes a reflective shell (53), a vibrating swing rod (54), and a vibrating sleeve (55); the vibrating sleeve (55) is fitted onto the outside of the horizontal tube and fixedly connected to the horizontal tube; the vibrating sleeve (55) is connected to the reflective shell (53) through the vibrating swing rod (54); the reflective shell (53) is U-shaped in general; the laser vibration sensor (52) is positioned opposite to the reflective shell (53) and extends into the reflective shell (53) along the axial direction of the vibrating swing rod (54).

9. The single-tube Coriolis flow meter according to claim 8, characterized in that: The drive assembly (6) includes a fixed rod (61), a stator (62), an electromagnet (63), and a rotor (64); the stator (62) is generally ring-shaped; there are multiple electromagnets (63), which are evenly distributed along the axial direction of the stator (62) on the inner wall of the stator (62); there is no contact between adjacent electromagnets (63); the rotor (64) includes a rotating ring and a rotor ball connected to the rotating ring; the rotating ring is fitted outside the helical tube (32) and is rotatably connected to the helical tube (32); the rotor ball is placed inside the stator (62) and rotates around the axial direction of the helical tube (32); the stator (62) is set inside the housing through the fixed rod (61); when the rotor (64) rotates, it drives the helical tube (32) to vibrate synchronously.

10. The single-tube Coriolis flow meter according to any one of claims 1-9, characterized in that: The housing includes an upper housing (1) and a lower housing (2) that is engaged with the upper housing (1).

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