Pipeline structure suitable for external clamping type ultrasonic flowmeter

Abstract

The utility model relates to the technical field of ultrasonic flowmeters, in particular to a pipeline structure suitable for an external clamping type ultrasonic flowmeter. The pipeline is a round pipeline, and a first sensor probe and a second sensor probe of the external clamping type ultrasonic flowmeter are arranged on the round pipeline in an up-and-down opposite angle mode; a plurality of arc-shaped protrusions are arranged on the wall of the pipeline at equal intervals along the axis of the pipeline, the arc-shaped protrusions are protrusions towards the outer side of the pipeline, and the arc-shaped protrusions are annular in the circumferential direction of the pipeline. And the plurality of arc-shaped bulges are positioned between the first sensor probe and the second sensor probe. The external clamping type ultrasonic flowmeter can eliminate or weaken ultrasonic waves transmitted along the wall of the pipeline, and interference on the external clamping type ultrasonic flowmeter during measurement is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic flowmeters, in particular to a pipeline structure suitable for an external clamp-on ultrasonic flowmeter. Background Art

[0002] Ultrasonic flowmeter refers to a flowmeter developed based on the principle that the propagation speed of ultrasonic waves in a flowing medium is equal to the vector sum of the average flow velocity of the measured medium and the speed of the sound wave in a stationary medium. Ultrasonic flowmeters are increasingly widely used in daily production and life. Common types include insertion type, pipeline type, and clamp-on type. However, in some complex working conditions, especially when measuring some corrosive media, the insertion type and pipeline type where the sensor probe contacts the medium have disadvantages. Not only the ultrasonic principle, but also flowmeters based on other principles have the same disadvantages. At this time, the ultrasonic clamp-on flowmeter has an almost irreplaceable advantage.

[0003] However, the clamp-on ultrasonic flowmeter also has defects and shortcomings in use. It is difficult to completely avoid signal interference from the pipe wall during measurement. Utility Model Content

[0004] In order to overcome the defects and shortcomings of the prior art, the utility model provides a pipeline structure suitable for an external clamp-on ultrasonic flowmeter, which eliminates or weakens the ultrasonic waves propagating along the pipeline wall and reduces the interference to the external clamp-on ultrasonic flowmeter during measurement.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A pipeline structure suitable for an external clamp-on ultrasonic flowmeter, the pipeline is a circular pipeline, a first sensor probe and a second sensor probe of the external clamp-on ultrasonic flowmeter are arranged one above the other and diagonally on the circular pipeline; a pipeline wall is provided with a plurality of arc-shaped protrusions equidistant along the axis of the pipeline, the arc-shaped protrusions protrude toward the outside of the pipeline, and are annular along the circumference of the pipeline; and the plurality of arc-shaped protrusions are located between the first sensor probe and the second sensor probe.

[0007] Furthermore, the arc-shaped protrusion is a semicircular arc.

[0008] Furthermore, the diameter of the semicircular arc of the arc-shaped protrusion is 1.1 to 1.3 times the thickness of the pipe wall.

[0009] Furthermore, the interval between the arc-shaped protrusions is 2 to 4 mm.

[0010] Further, the total length of the plurality of arc-shaped protrusions along the pipeline axis is L, and the distance between the first sensor dyeing head and the second sensor probe is D;

[0011] If the inner diameter of the pipe is less than 80 mm, then L = D;

[0012] If the inner diameter of the pipe is greater than 80 mm,

[0013] Compared with the prior art, the utility model has at least the following technical effects or advantages:

[0014] 1. Reducing invalid ultrasonic signals is the main purpose of the utility model. The commonly used methods are absorption, diffusion and scattering. Absorption is to wrap the outer wall of the pipe with sound-absorbing materials to reduce signal interference; diffusion is to increase the propagation distance (pipe diameter), etc.; and scattering is when ultrasonic waves pass through different media and undergo refraction and scattering, etc., so that only a small part of the signal can be received. The utility model adopts two methods, diffusion and scattering. The utility model sets a plurality of equally spaced arc-shaped protrusions between the first sensor dye head and the second sensor probe of the external clamp-on ultrasonic flowmeter symmetrically arranged on the pipeline. When the ultrasonic wave propagates to the annular arc-shaped protrusion, the signal will be refracted and attenuated inside the arc-shaped protrusion, effectively reducing the transmission of useless signals, thereby reducing the interference to the ultrasonic flowmeter during measurement.

[0015] 2. The utility model sets the arc-shaped protrusion to be a semicircular arc, and the diameter of the semicircular arc is 1.1 to 1.3 times the thickness of the pipe wall, the spacing of the arc-shaped protrusion is 2 to 4 mm, and the length of the arc-shaped protrusion is set. The ultrasonic wave of a specific frequency transmitted along the pipe wall will fully interfere with itself in the arc-shaped protrusion, improve signal refraction and attenuation, and greatly and effectively reduce the transmission of useless signals, thereby further effectively reducing the interference of the ultrasonic flowmeter during measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0017] Figure 2 It is a front view showing the structure of the utility model.

[0018] Figure 3 It is a schematic side view of the structure of the utility model.

[0019] Figure 4 This is a working principle diagram of the utility model.

[0020] Figure 5 It is a schematic diagram of the arc-shaped protrusion structure of the utility model.

[0021] In the figure: 1- pipe 2- first sensor probe 3- second sensor probe 4- arc-shaped protrusion DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In the description of the present utility model, 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] Example:

[0025] like Figure 1-5 As shown, a pipe structure suitable for an external clamp-on ultrasonic flowmeter, the pipe 1 is a circular pipe, and the first sensor probe 2 and the second sensor probe 3 of the external clamp-on ultrasonic flowmeter are arranged one above the other and diagonally on the circular pipe. Figure 2 As shown, the first sensor probe 2 is located at the upper left side, and the second sensor probe 3 is located at the lower right side. The first sensor probe 2 is horizontally flipped along the vertical symmetry line, and then flipped up and down along the pipeline axis to facilitate the overlap of the second sensor probe 3.

[0026] The pipe wall is provided with a plurality of arc-shaped protrusions 4 at equal intervals along the axis of the pipe, the arc-shaped protrusions 4 protrude toward the outside of the pipe, and are annular along the circumference of the pipe. The plurality of arc-shaped protrusions 4 are located between the first sensor probe 4 and the second sensor probe 4, and five are provided in this embodiment.

[0027] like Figure 5 As shown, preferably, the arc-shaped protrusion 4 is semi-circular. The diameter of the semi-circular arc is 1.1 to 1.3 times the thickness of the pipe wall. Preferably, the diameter of the semi-circular arc is 1.2 times the thickness of the pipe wall. The spacing between the arc-shaped protrusions 4 is 2 to 4 mm.

[0028] The total length of the multiple arc-shaped protrusions along the pipeline axis is L, and the distance between the first sensor head 2 and the second sensor probe 3 is D; if the inner diameter of the pipeline is less than 80 mm (DN80), then L=D; if the inner diameter of the pipeline is greater than 80 mm (DN80), then

[0029] like Figure 4 As shown, the working principle of the utility model is as follows:

[0030] The main purpose of this structure is to reduce invalid ultrasonic signals. The commonly used methods are absorption, diffusion and scattering. Absorption is to wrap the outer wall of the tube with sound-absorbing material to reduce signal interference; diffusion is to increase the propagation distance (tube diameter) etc.; and scattering is the refraction and scattering of ultrasonic waves when passing through different media, and only a small part of the signal can be received.

[0031] The utility model adopts two methods, diffusion and scattering. While the first sensor dye head 2 and the second sensor probe 3 transmit ultrasound to each other (three-arrow lines and double-arrow lines), part of the ultrasound will propagate through the inside of the pipe wall thickness (single-arrow line). In the traditional pipeline structure, when special equipment is used to read the signal, there are various noises and invalid signals that need to be distinguished and processed, which not only increases the burden of equipment calculation, but also interferes with people's judgment of the correct signal.

[0032] In the utility model, the pipe between the first sensor dye head 2 and the second sensor probe 3 has a pipe wall provided with a plurality of arc-shaped protrusions 4 at equal intervals along the axis of the pipe. When ultrasound propagates to the annular arc-shaped protrusions 4, as shown by the single arrow line, the signal will be refracted and attenuated inside the semicircle, effectively reducing the transmission of useless signals, thereby reducing the interference to the ultrasonic flowmeter during measurement.

[0033] The utility model sets the arc-shaped protrusion to be a semicircular arc, and the diameter of the semicircular arc is 1.1 to 1.3 times the thickness of the pipe wall, the spacing of the arc-shaped protrusion is 2 to 4 mm, and the length of the arc-shaped protrusion is set. The ultrasonic wave of a specific frequency transmitted along the pipe wall will fully interfere with itself in the arc-shaped protrusion, improve signal refraction and attenuation, and greatly and effectively reduce the transmission of useless signals, thereby further effectively reducing the interference of the ultrasonic flowmeter during measurement.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pipeline structure suitable for an external clamp-on ultrasonic flowmeter, characterized in that: The pipeline is a circular pipeline, and the first sensor probe and the second sensor probe of the external clamp-on ultrasonic flowmeter are arranged one above the other and diagonally on the circular pipeline; The pipe wall is provided with a plurality of arc-shaped protrusions at equal intervals along the axis of the pipe, the arc-shaped protrusions protrude toward the outside of the pipe, and are annular along the circumference of the pipe; A plurality of arc-shaped protrusions are located between the first sensor probe and the second sensor probe.

2. A pipeline structure suitable for an external clamp-on ultrasonic flowmeter according to claim 1, characterized in that: The arc-shaped protrusion is in a semicircular arc shape.

3. A pipeline structure suitable for an external clamp-on ultrasonic flowmeter according to claim 2, characterized in that: The diameter of the semicircular arc of the arc-shaped protrusion is 1.1 to 1.3 times the thickness of the pipe wall.

4. The pipeline structure suitable for an external clamp-on ultrasonic flowmeter according to claim 1, characterized in that: The interval between the arc-shaped protrusions is 2 to 4 mm.

5. The pipeline structure suitable for an external clamp-on ultrasonic flowmeter according to claim 1, characterized in that: The total length of the plurality of arc-shaped protrusions along the pipeline axis is L, and the distance between the first sensor dyeing head and the second sensor probe is D; If the inner diameter of the pipe is less than 80 mm, then L = D; If the inner diameter of the pipe is greater than 80 mm,

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