Flow meter sensor, flow meter and method for improving fluid impact vibration tube

Abstract

The present invention discloses a flow meter sensor, a flow meter and a method for improving fluid impact on a vibration tube, belonging to the technical field of mass flow measurement, wherein the flow meter sensor comprises: an upstream pipe joint, a downstream pipe joint and a vibration tube, the vibration tube is connected between the upstream pipe joint and the downstream pipe joint, and has two parallel pipes, a necking section is provided in the upstream pipe joint, and the inner diameter of the necking section gradually decreases toward the vibration tube; the flow meter sensor of the present invention rectifies the fluid through the necking section to increase the fluid flow rate, so that the fluid after passing through the necking section is concentratedly impacted on the diverter or plane between the two vibration tubes, thereby reducing the direct impact of the fluid on the vibration tube.

Description

Technical Field

[0001] The present invention relates to the technical field of mass flow measurement, and in particular to a flow meter sensor based on the Coriolis principle, a mass flow meter with the sensor, and a method for improving the direct high-speed impact of a fluid entering the flow meter on a vibrating tube. Background Art

[0002] The Coriolis mass flowmeter is an instrument that directly and accurately measures the flow of fluids. Its principle is Newton's second law F=Ma. When the fluid flows in the vibrating tube, a Coriolis force proportional to the mass flow rate will be generated (also referred to as the Coriolis force, which is a description of the displacement of the linear motion of a particle in a rotating system due to inertia relative to the rotating system). When there is no fluid flowing through, the vibrating tube does not produce distortion, and the signals detected by the electromagnetic signal detectors on both sides of the vibrating tube are in phase; when there is fluid passing through, the vibrating tube is distorted under the action of torque, and there will be a phase difference between the two detectors.

[0003] The Coriolis mass flowmeter consists of a sensor and a transmitter, which are connected by a special 9-core cable. The transmitter is an intelligent flow meter with a microprocessor. After converting and processing the low-level signal sent by the sensor, it outputs two 4-20mA standard signals that are proportional to the flow rate and density. The transmitter measures the lag time between the left and right detection signals. This time difference multiplied by the flow calibration coefficient can determine the mass flow rate. The vibration tube structure of the sensor has many forms such as straight tube, U-shaped tube, Ω type, etc.

[0004] In actual use, since the vibration tube is directly impacted by the upstream fluid at high speed, it is easy to be damaged, so the service life of the vibration tube is short. Summary of the invention

[0005] The purpose of the present invention is to provide a flow meter sensor based on the Coriolis principle, a mass flow meter with the above sensor, and a method for improving the direct high-speed impact of the fluid entering the flow meter on the vibration tube, so as to solve the defects of the Coriolis flow meter in the prior art, that the vibration tube is easily damaged and has a short service life due to the direct high-speed impact of the upstream fluid on the vibration tube.

[0006] In order to solve the above technical problems, the flow meter sensor provided by the present invention comprises:

[0007] An upstream pipe connector, used for connecting an upstream fluid pipe;

[0008] A downstream pipe connector, used for connecting a downstream fluid pipe;

[0009] A vibration pipe connected between the upstream pipe joint and the downstream pipe joint, and having two parallel pipes;

[0010] A necking section is provided in the upstream pipe joint, and the inner diameter of the necking section gradually decreases toward the vibration pipe.

[0011] As a preferred solution, the minimum inner diameter of the necked section is smaller than the total width of the two vibration tubes.

[0012] As a preferred solution, the minimum inner diameter of the necked section is greater than or equal to the center distance between the two vibration tubes.

[0013] As a preferred solution, a flaring section is further provided in the upstream pipe joint, an opening end of the flaring section with a gradually increasing inner diameter is connected toward the vibration pipe, and a contracting end of the flaring section with a gradually decreasing inner diameter is connected toward the contracting section.

[0014] As a preferred solution, the length of the expansion section is equal to the center distance between the two vibration tubes.

[0015] As a preferred solution, a straight section is further provided in the upstream pipe joint, and the straight section is connected between the shrinking section and the expanding section.

[0016] As a preferred solution, it also includes:

[0017] The outer sleeve is sleeved on the outside of the vibration tube, and two ends of the outer sleeve are respectively connected to the upstream pipe joint and the downstream pipe joint.

[0018] As a preferred solution, it also includes:

[0019] A first vibration isolation sheet is connected between the two vibration tubes and is located near the ends of the vibration tubes;

[0020] The second vibration isolation plate is arranged in parallel with the first vibration isolation plate and is located between the first vibration isolation plate and the end of the vibration tube.

[0021] The flowmeter provided by the present invention comprises the flowmeter sensor described in any one of the above schemes, and also comprises a transmitter electrically connected to the flowmeter sensor.

[0022] The method for improving fluid impact on a vibration tube provided by the present invention is used to reduce the impact of upstream fluid on the vibration tube when entering a flow meter sensor, and comprises the following steps:

[0023] Reduce the fluid cross section. Before the fluid enters the flow meter sensor, the fluid is impacted between the two vibrating tubes by reducing the fluid cross section.

[0024] Maintain the fluid cross section so that the fluid cross section maintains the minimum cross section flow preset distance after being reduced;

[0025] The fluid cross section is enlarged so that part of the fluid is turned toward the two sides of the two vibration tubes before reaching between the two vibration tubes.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The flow meter sensor provided by the present invention rectifies the fluid through the constriction section to increase the fluid flow rate, so that the fluid after passing through the constriction section is concentratedly impacted on the diverter or plane between the two vibration tubes, reducing the direct impact of the fluid on the vibration tube.

[0028] In addition, the tapered section can also increase the flow resistance, reduce the pressure loss at the entrance of the two vibrating tubes, and reduce vortices and cavitation (in the hydraulic system, when the pressure of the flowing liquid at a certain point is lower than the air separation pressure, the air originally dissolved in the liquid will be freed, causing a large number of bubbles to form in the liquid. This is the cavitation phenomenon in hydraulics).

[0029] 2. The flow meter sensor provided by the present invention has a minimum inner diameter of the necked section that is smaller than the total width of the two vibration tubes and greater than or equal to the center distance between the two vibration tubes. After the upstream fluid passes through the necked section to reduce its cross-section, it can be concentratedly impacted toward the diverter or plane between the two vibration tubes, thereby reducing the impact of the fluid on the vibration tube.

[0030] 3. The flow meter sensor provided by the present invention has a flared section in the upstream pipe joint, which is used to be connected between the necked section and the vibration tube. After the upstream fluid passes through the necked section with its cross section reduced, when it impacts the middle of the two vibration tubes, part of the fluid will turn toward the vibration tubes on both sides, thereby making the fluid produce a smooth turning transition.

[0031] 4. The flow meter sensor provided by the present invention has a straight section in the upstream pipe joint, which is used to connect between the necking section and the expanding section. After the upstream fluid has reduced its cross-section through the necking section, it maintains a preset flow distance in the straight section to avoid sudden expansion of the fluid after the necking section, causing vortices and cavitation.

[0032] 5. The flow meter provided by the present invention includes any of the sensors described above, and thus has any of the advantages described above.

[0033] 6. The method for improving fluid impact on the vibration tube provided by the present invention first reduces the flow cross-section of the fluid before the upstream fluid enters the vibration tube so that the fluid can impact between the two vibration tubes, thereby avoiding the upstream fluid directly impacting the vibration tube and increasing the service life of the vibration tube.

[0034] After reducing the flow cross section of the upstream fluid, the fluid cross section is expanded so that when the upstream fluid impacts the middle of the two vibration tubes, part of the fluid will turn toward the vibration tubes on both sides, thereby making the fluid have a smooth turning transition.

[0035] After reducing the upstream fluid cross-section, the fluid flows in a pipe with the same cross-sectional diameter as the minimum cross-section and maintains a preset flow distance before expanding the fluid cross-section. This can prevent the fluid from suddenly expanding after the reduction in diameter, causing vortices and cavitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a top cross-sectional view of the upstream pipe joint portion of the flow meter sensor in an embodiment of the present invention.

[0038] Figure 2 This is the front cross-sectional view of the flow meter sensor.

[0039] Figure 3 It is the left side view of the upstream pipe joint part of the flow meter sensor.

[0040] Figure 4 for Figure 1 Schematic diagram of the fluid flow in the upstream pipe joint.

[0041] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the upstream pipe joint part of the flow meter sensor.

[0042] Description of reference numerals:

[0043] 1. Upstream pipe joint; 2. Downstream pipe joint; 3. Vibration pipe; 4. First vibration isolation plate; 5. Second vibration isolation plate; 6. Outer sleeve; 7. Fluid. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below 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 creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Example 1

[0049] The flow meter sensor provided in this embodiment includes: an upstream pipe joint 1 , a downstream pipe joint 2 , a vibration tube 3 , a vibration isolation sheet and an outer sleeve 6 .

[0050] like Figure 1 As shown, the outer diameter of the upstream pipe joint 1 and the downstream pipe joint 2 is D1, and the value of D1 is equal to the inner diameter of the fluid pipe used to connect to the flow meter sensor.

[0051] The upstream pipe joint 1 is provided with a necking section, the length of which is S1, and the inner diameter of the necking section gradually decreases toward the vibration tube 3. The value of the minimum inner diameter D2 of the necking section can be selected within the range of 0.4 to 0.8 times the total width of the two vibration tubes 3. In this embodiment, the minimum inner diameter D2 of the necking section is equal to the center distance between the two vibration tubes 3. The value of the length S1 of the necking section is the same as the selection range of the minimum inner diameter D2. In this embodiment, S1 is also made equal to the center distance between the two vibration tubes 3.

[0052] A straight section is also provided in the upstream pipe joint 1. The length of the straight section is S2, and the inner diameter is equal to the minimum inner diameter D2 of the necked section. The length S2 of the straight section is approximately equal to 0.5 times the center distance between the two vibration tubes 3, that is, half of S1.

[0053] The upstream pipe joint 1 is also provided with a flaring section, the length of which is S3, the inner diameter of which gradually increases, and the open end of which is directly connected to the two vibration tubes 3. The minimum diameter of the flaring section is equal to the minimum diameter D2 of the shrinking section, and the maximum diameter is equal to the total width of the two vibration tubes 3. The length S3 of the flaring section is equal to the center distance between the two vibration tubes 3, that is, equal to S1. In addition, as an alternative embodiment, the length S1 of the shrinking section, the length S2 of the straight section, and the length S3 of the flaring section can also be other values.

[0054] like Figure 2 As shown, the upstream pipe joint 1 is connected to one end of the outer sleeve 6, the downstream pipe joint 2 is connected to the other end of the outer sleeve 6, the vibration tube 3 has two parallel and spaced apart, both ends of the vibration tube 3 are sleeved in the outer sleeve 6, and are respectively connected to the upstream pipe joint 1 and the downstream pipe joint 2.

[0055] Vibration isolation plates are connected to the two vibrating tubes 3 near both ends thereof. The vibration isolation plates include a first vibration isolation plate 4 and a second vibration isolation plate 5 . The first vibration isolation plate 4 and the second vibration isolation plate 5 are arranged in parallel.

[0056] like Figure 3 , Figure 5 As shown, when the minimum inner diameter D2 of the necked section of the upstream pipe joint 1 is equal to the center distance between the two vibration tubes 3, half of the two vibration tubes 3 can be seen from the left view of the flow meter sensor.

[0057] How it works

[0058] like Figure 4 As shown, the fluid 7 first enters the flow meter sensor from the upstream pipe joint 1. In the upstream pipe joint 1, the fluid 7 passes through the necking section, the straight section and the flaring section in sequence. The fluid 7 reduces the fluid cross section in the necking section, so that the fluid impacts between the two vibration tubes 3. After the cross section is reduced, the fluid maintains the minimum cross section and flows for a certain distance in the straight section, which can improve the vortex and cavitation caused by the fluid passing through the necking. Then, part of the fluid reaches between the two vibration tubes 3 through the flaring section. When the fluid 7 flows from the straight section to the flaring section, it turns toward the two sides of the two vibration tubes 3, so that the fluid can produce a smooth turning transition.

[0059] Example 2

[0060] The flowmeter provided in this embodiment is a flowmeter manufactured according to the Coriolis principle, including the flowmeter sensor described in Example 1, and also includes a transmitter, wherein the transmitter is electrically connected to the flowmeter sensor, and the transmitter is used for signal processing.

[0061] Example 3

[0062] This embodiment provides a method for improving fluid impact on a vibration tube, which is used to reduce the impact of upstream fluid on the vibration tube 3 when entering a flow meter sensor, and includes the following steps:

[0063] The fluid cross section is reduced so that the fluid impacts between the two vibration tubes 3 before the fluid enters the flow meter sensor.

[0064] Maintain the fluid cross section so that the fluid cross section maintains the minimum cross section flow preset distance after it is reduced.

[0065] The fluid cross section is enlarged so that part of the fluid is turned toward the two sides of the two vibration tubes 3 before reaching between the two vibration tubes 3 .

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A flow meter sensor, comprising: An upstream pipeline connector (1), used for connecting an upstream fluid pipeline; A downstream pipeline connector (2), used for connecting a downstream fluid pipeline; A vibration pipe (3) connected between the upstream pipe joint (1) and the downstream pipe joint (2), comprising two parallel pipes; The invention is characterized in that a necking section is provided inside the upstream pipe joint (1), and the inner diameter of the necking section gradually decreases toward the vibration pipe (3); The upstream pipe joint (1) is also provided with a flaring section, the opening end of the flaring section with a gradually increasing inner diameter is connected toward the vibration pipe (3), and the shrinking end of the flaring section with a gradually decreasing inner diameter is connected toward the shrinking section; The upstream pipe joint (1) is further provided with a straight section, wherein the straight section is connected between the narrowing section and the expanding section; The expanded section comprises two partial expanded openings connected to the inner wall of the straight section, and the opening ends of the two partial expanded openings are connected toward the two vibration tubes (3); The minimum inner diameter D2 of the necking section is equal to the center distance between the two vibration tubes (3), and the length S1 of the necking section is equal to its minimum inner diameter D2; the length S2 of the straight section is equal to half the length S1 of the necking section; the minimum inner diameter of the expanding section is equal to the minimum inner diameter D2 of the necking section, the maximum inner diameter is equal to the total width between the two vibration tubes (3), and the length S3 of the expanding section is equal to the length S1 of the necking section; There is a plane between the two vibration tubes (3), and the plane is flush with the inlets of the two vibration tubes (3); The fluid reduces its cross section in the constricted section, so that the fluid impacts the plane between the two vibration tubes (3).

2. The flow meter sensor according to claim 1, characterized in that: Also includes: An outer sleeve (6) is sleeved on the outside of the vibration tube (3), and its two ends are respectively connected to the upstream pipe joint (1) and the downstream pipe joint (2).

3. The flow meter sensor according to claim 1, characterized in that: Also includes: A first vibration isolation sheet (4) connected between the two vibration tubes (3) and located near the ends of the vibration tubes (3); The second vibration isolation plate (5) is arranged in parallel with the first vibration isolation plate (4) and is located between the first vibration isolation plate (4) and the end of the vibration tube (3).

4. A flow meter, characterized in that: The flow meter sensor according to any one of claims 1 to 3 further comprises: A transmitter is electrically connected to the flow meter sensor.

5. A method for improving fluid impact on a vibrating tube using a flow meter sensor as claimed in any one of claims 1 to 3, for reducing the impact of upstream fluid on the vibrating tube (3) when entering the flow meter sensor, characterized in that: The following steps are involved: Reducing the cross section of the fluid, before the fluid enters the flow meter sensor, by reducing the cross section of the fluid, the fluid is made to impact between the two vibration tubes (3); Maintain the fluid cross section so that the fluid cross section maintains the minimum cross section flow preset distance after being reduced; The fluid cross section is enlarged so that part of the fluid is diverted toward the two sides of the two vibration tubes (3) before reaching between the two vibration tubes (3).

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