Single-tube self-vibrating Coriolis flowmeter

Abstract

The utility model belongs to the field of metering, and relates to a single-tube self-vibration type Coriolis flowmeter which comprises a shell, a measuring tube, a vibration swing arm and a measuring assembly. The measuring tube is arranged in the shell; the vibration swing arm is arranged on the measuring tube and synchronously vibrates along with the measuring tube; the measuring assembly is arranged in the shell and measures the amplitude of the vibration swing arm. The utility model provides the single-tube self-vibrating Coriolis flowmeter which is low in pipeline stress deformation and high in measurement precision.

Description

Technical Field

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

[0002] Currently, most flow meters on the market are dual-tube flow meters, which have several drawbacks: First, dual-tube flow meters are constructed by welding two measuring tubes and two distributors together, resulting in numerous components. Local stress variations at the weld joints of the measuring tubes can cause slight misalignments, making the natural frequencies of the two measuring tubes uncontrollable. Second, dual-tube flow meters require extremely high similarity between the two measuring tubes; differences in tube curvature lead to different vibration frequencies, making accuracy control difficult due to these factors. Furthermore, dual-tube flow meters require a separate drive unit to excite the measuring tubes, causing pipe vibration, which is then detected by a vibration detection component. The drive unit generates a magnetic field that affects the vibration detection component. Finally, in dual-tube flow meters, the distributors must first be welded to the support tube before the two measuring tubes are welded to the two distributors, requiring very high precision in the connection. Utility Model Content

[0003] In order to solve the above-mentioned technical problems in the background art, the present invention provides a single-tube self-vibrating Coriolis flow meter with low pipeline stress deformation and high measurement accuracy.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A single-tube self-vibrating Coriolis flow meter is characterized in that: the single-tube self-vibrating Coriolis flow meter includes a housing, a measuring tube, a vibrating arm, and a measuring component; the measuring tube is placed inside the housing; the vibrating arm is mounted on the measuring tube and vibrates synchronously with the measuring tube; the measuring component is placed inside the housing and measures the amplitude of the vibrating arm.

[0006] 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; and the vibrating swing arm is disposed on the spiral tube.

[0007] The spiral tube has multiple turns, and the number of vibrating arms corresponds to the number of turns of the spiral tube.

[0008] The aforementioned vibrating swing arm includes a swing rod and a positioning ring; the positioning ring is connected to a spiral tube via the swing rod; the measuring component extends into the positioning ring and measures the amplitude of the positioning ring.

[0009] The aforementioned measuring components include a laser vibration sensor; the laser vibration sensor extends into the positioning ring and measures the amplitude of the positioning ring.

[0010] The number of the aforementioned laser vibration sensors is the same as the number of positioning rings.

[0011] The aforementioned measuring assembly also includes a support rod disposed inside the housing along the axial direction of the housing; the laser vibration sensor is disposed on the support rod; and the helical tube is disposed around the outside of the support rod.

[0012] The inner wall of the aforementioned measuring tube is provided with a flow guide groove.

[0013] The aforementioned guide channel is a spiral guide channel.

[0014] The housing has an overall U-shaped structure, and the single-tube self-vibrating Coriolis flow meter also includes a side plate disposed on the housing.

[0015] The advantages of this utility model are:

[0016] This invention provides a single-tube self-vibrating Coriolis flow meter, comprising a housing, a measuring tube, a vibrating arm, and a measuring component. The measuring tube is placed inside the housing; the vibrating arm is mounted on the measuring tube and vibrates synchronously with it; the measuring component is placed inside the housing and measures the amplitude of the vibrating arm. This single-tube self-vibrating Coriolis flow meter uses only one measuring tube, employing the flow-induced vibration generated by fluid flowing through a curved pipe as the vibration source. This eliminates the external force drive required in current flow meters and can be directly manufactured using existing mature processes such as bending, avoiding multi-point welding of multiple components and resulting in low stress deformation of the measuring pipe. Simultaneously, the measuring tube adopts a multi-turn spiral structure, which can change the fluid flow direction multiple times, thereby increasing the flow-induced vibration generated by the fluid on the measuring tube, resulting in a more significant amplitude throughout the measuring tube. Furthermore, this invention features a spiral guide groove on the inner wall of the measuring tube, increasing the contact area between the fluid and the measuring tube, and guiding the fluid flow direction, making the vibration generated by the measuring tube more stable and measurable, increasing the vibration amplitude of the vibration source, and improving measurement accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the single-tube self-vibrating Coriolis flowmeter provided by this utility model;

[0018] Figure 2 This is a cross-sectional structural schematic diagram of the single-tube self-vibrating Coriolis flowmeter provided by this utility model;

[0019] Figure 3 This is a front view structural schematic diagram of the single-tube self-vibrating Coriolis flowmeter provided by this utility model;

[0020] Figure 4 This is a schematic diagram of the overall mechanism of the measuring tube used in this utility model;

[0021] Figure 5 yes Figure 4 A schematic diagram of the side view structure;

[0022] Figure 6 This is a schematic diagram of the structure of the vibrating swing arm used in this utility model;

[0023] Figure 7 This is a cross-sectional view of the measuring tube used in this utility model;

[0024] in:

[0025] 1-Housing; 2-Side plate; 3-Measuring tube; 31-Inlet section; 32-Spiral tube; 33-Outlet section; 34-Spiral guide groove; 41-Support rod; 42-Laser vibration sensor; 51-Swing rod; 52-Positioning ring. Detailed Implementation

[0026] See Figure 1 as well as Figure 2 This invention provides a single-tube self-vibrating Coriolis flow meter, comprising a housing 1, a measuring tube 3, a vibrating arm, and a measuring component. The measuring tube 3 is placed inside the housing 1. The vibrating arm is mounted on the measuring tube 3 and vibrates synchronously with it. The measuring component is placed inside the housing 1 and measures the amplitude of the vibrating arm. The principle of this invention is to use the flow-induced vibration of the measuring tube generated when fluid flows through a curved pipe as the vibration source, eliminating the external force driving component required in current flow meters. This invention uses a single measuring tube 3, which can be directly processed using existing mature processes such as bending and winding, avoiding multi-site welding of multiple components and resulting in low stress deformation of the measuring pipe.

[0027] See Figure 3 as well as Figure 4 The measuring tube 3 includes, from front to back, an inlet section 31, a spiral tube 32, and an outlet section 33 connected sequentially. The inlet section 31 and outlet section 33 penetrate the housing 1 from the outside. The spiral tube 32 is disposed inside the housing 1. Vibrating arms are disposed on the spiral tube 32. The spiral tube 32 has multiple turns, and the number of vibrating arms corresponds to the number of turns of the spiral tube 32. For example, the spiral tube 32 has 4 turns, and a vibrating arm is fixed on each turn of the spiral tube 32. The function of the multiple turns of the spiral tube 32 is to repeatedly change the fluid flow direction, thereby increasing the flow-induced vibration of the fluid on the measuring tube 3, thus causing a more significant amplitude of vibration throughout the measuring tube. See also... Figure 5 as well as Figure 7The measuring tube 3 used in this invention has a flow guide groove on its inner wall. For example, the flow guide groove can be a spiral flow guide groove 34. This invention uses a spiral flow guide groove 34, which increases the contact area between the fluid and the measuring tube 3, and guides the flow direction of the fluid, making the vibration generated by the measuring tube 3 more stable and measurable, and increasing the vibration amplitude of the vibration source.

[0028] See Figure 4 , Figure 5 as well as Figure 6 The vibrating swing arm used in this invention includes a swing rod 51 and a positioning ring 52. The positioning ring 52 is connected to the spiral tube 32 through the swing rod 51. The measuring component extends into the positioning ring 52 and detects the vibration displacement of the corresponding spiral tube 32 through light feedback from the positioning ring 52. The use of the swing rod 51 amplifies the amplitude of the measuring tube 3 (because the swing rod 51 is made of a rigid and lightweight material, and the vibration frequency of the swing rod 51 is the same as the frequency of the measuring tube 3, the vibration of the measuring tube 3 will cause the swing rod 51 to resonate, thereby amplifying the amplitude at the end of the swing rod 51 away from the measuring tube 3), making the detection of pipe amplitude more accurate.

[0029] See Figure 4 as well as Figure 5 The measuring component used in this invention includes a laser vibration sensor 42; the laser vibration sensor 42 extends into the positioning ring 52 and measures the amplitude of the positioning ring 52. The number of laser vibration sensors 42 is the same as the number of positioning rings 52.

[0030] Furthermore, the measuring assembly used in this invention includes a support rod 41 arranged axially inside the housing 1; a laser vibration sensor 42 mounted on the support rod 41; and a spiral tube 32 surrounding the support rod 41. The laser vibration sensor 42 can be a triaxial laser vibration sensor. For example, this invention uses four laser vibration sensors 42, each extending into a corresponding positioning ring 52 for detection. Along the liquid flow direction, the data detected by the first laser vibration sensor 42 corresponds to the data detected by the fourth laser vibration sensor 42, and the data detected by the second laser vibration sensor 42 corresponds to the data detected by the third laser vibration sensor 42, thus eliminating the influence of accidental vibrations. Simultaneously, the average value of the four detection groups is selected to improve detection accuracy.

[0031] See Figure 1 The housing 1 used in this utility model has an overall U-shaped structure, and the single-tube self-vibrating Coriolis flow meter also includes a side plate 2 disposed on the housing 1.

[0032] In operation, the medium flowing through the measuring tube 3 induces flow-induced vibrations in the measuring tube 3. The frequency and amplitude of these vibrations typically exhibit a certain degree of stability, thus the frequency and amplitude of the measuring tube 3 tend to converge. Simultaneously, the measuring tube 3 contains a spiral guide groove 34 with the same spiral direction as the measuring tube 3, increasing the contact area between the medium and the spiral guide groove 34. This enhances the flow-induced vibrations generated by the medium on the measuring tube 3, allowing for stable amplitude even at lower flow rates. A vibrating swing arm is fixedly connected to the outer wall of the measuring tube 3. The measuring tube 3 drives the vibrating swing arm to vibrate together. A laser vibration sensor 42 fixed on the support rod 41 measures the frequency and amplitude of the vibrating swing arm, thereby measuring the fluid flow rate. Furthermore, multiple sets of sensors and vibrating swing arms can be used to cross-reference multiple detection results, improving measurement accuracy.

Claims

1. A single-tube self-vibrating Coriolis flow meter, characterized in that: The single-tube self-vibrating Coriolis flowmeter includes a housing (1), a measuring tube (3), a vibrating arm, and a measuring component; the measuring tube (3) is placed inside the housing (1); the vibrating arm is set on the measuring tube (3) and vibrates synchronously with the measuring tube (3); the measuring component is placed inside the housing (1) and measures the amplitude of the vibrating arm.

2. The single-tube self-vibrating Coriolis flowmeter 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 housing (1) from the outside of the housing (1); the spiral tube (32) is disposed inside the housing (1); the vibrating swing arm is disposed on the spiral tube (32).

3. The single-tube self-vibrating Coriolis flowmeter according to claim 2, characterized in that: The spiral tube (32) has multiple turns, and the number of vibrating swing arms corresponds to the number of turns of the spiral tube (32).

4. The single-tube self-vibrating Coriolis flowmeter according to claim 3, characterized in that: The vibrating swing arm includes a swing rod (51) and a positioning ring (52); the positioning ring (52) is connected to the spiral tube (32) through the swing rod (51); the measuring component extends into the positioning ring (52) and measures the amplitude of the positioning ring (52).

5. The single-tube self-vibrating Coriolis flowmeter according to claim 4, characterized in that: The measuring component includes a laser vibration sensor (42); the laser vibration sensor (42) extends into the positioning ring (52) and measures the amplitude of the positioning ring (52).

6. The single-tube self-vibrating Coriolis flowmeter according to claim 5, characterized in that: The number of laser vibration sensors (42) is the same as the number of positioning rings (52).

7. The single-tube self-vibrating Coriolis flowmeter according to claim 6, characterized in that: The measuring assembly also includes a support rod (41) arranged axially inside the housing (1); the laser vibration sensor (42) is arranged on the support rod (41); and the spiral tube (32) is arranged around the outside of the support rod (41).

8. The single-tube self-vibrating Coriolis flowmeter according to any one of claims 1-7, characterized in that: The inner wall of the measuring tube (3) is provided with a flow guide groove.

9. The single-tube self-vibrating Coriolis flowmeter according to claim 8, characterized in that: The guide channel is a spiral guide channel (34).

10. The single-tube self-vibrating Coriolis flowmeter according to claim 9, characterized in that: The housing (1) has an overall U-shaped structure, and the single-tube self-vibrating Coriolis flow meter also includes a side plate (2) disposed on the housing (1).

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