Low-pressure-drop flow divider suitable for omega-shaped Coriolis flow meter

Abstract

The invention discloses a low-pressure-drop flow divider suitable for an omega-shaped Coriolis flow meter. The flow divider is composed of two main pipelines and four branch flow guide pipes. The two main pipelines have the same pipe diameter as the system pipeline, and the ends, connected with the measuring pipe, of the branch flow guide pipes have the same inner diameter as the measuring pipe. The main pipeline and the branch flow guide pipes are transited through lofting design, pressure drop caused by sudden change of the pipe diameter is avoided, and it is ensured that the flow field is more stable. Compared with an existing flow divider structure, the flow divider provided by the invention has a larger bending radius and a smaller bending angle, so that large pressure drop and flow velocity distribution change caused by flow direction change of fluid in the flow divider are reduced. In addition, compared with an existing flow divider structure, the flow divider structure has the lower height, compact design of the omega-shaped Coriolis flow meter is facilitated, and the adaptability of the omega-shaped Coriolis flow meter to the installation space is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid flow splitting, and in particular relates to a low-pressure drop flow splitter suitable for an Ω-type Coriolis flowmeter. Background Art

[0002] Coriolis flowmeters usually use a double-tube structure to reduce the impact of external vibration on measurement performance. In order to achieve uniform distribution of system pipeline fluid into the two measuring tubes, and the fluid in the two measuring tubes merges into the system pipeline again, the Coriolis flowmeter also needs to be equipped with a splitter. The splitter usually includes a large-end inlet and multiple small-end outlets. The large-end inlet has an inner diameter consistent with the system pipeline, and the inner diameter of the small-end outlet is consistent with the inner diameter of the measuring tube. The large-end inlet and the small-end outlet of the splitter have a smooth transition to achieve uniform distribution of the fluid while reducing pressure loss and interference with the flow field distribution.

[0003] When using an Ω-type double-tube Coriolis flowmeter, since the flow direction of the fluid in the system pipeline is greatly different from the flow direction of the fluid in the measuring tube, the flow direction of the fluid inside the Coriolis flowmeter using the existing splitter is as follows: Figure 1 As shown in (A→B→C→D→E→F→G→H). Since the diverter has a small turning radius and a large turning angle, it will cause a large pressure drop in the fluid at the diverter. At the same time, the drastic change in the direction of the fluid also interferes with the uniformity of the flow field distribution. In order to reduce the flow pressure drop caused by the existing diverter, it is necessary to increase the turning radius of the diverter, which will cause the overall size of the diverter to become larger, increase the overall height of the Coriolis flowmeter and its installation space requirements. Summary of the invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a low pressure drop diverter suitable for an Ω-type Coriolis flowmeter, thereby reducing the pressure loss and interference to the flow field distribution introduced by the diverter of the Ω-type Coriolis flowmeter, while reducing the overall height of the diverter and promoting the compact design of the Coriolis flowmeter.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] The present invention discloses a low-pressure-drop flow divider suitable for an Ω-type Coriolis flowmeter, comprising a flow divider body, wherein a flow divider body is provided with a flow divider line for dividing a fluid in a system pipeline and conveying the fluid to two measuring tubes, and a flow converging line for converging the fluids of the two measuring tubes and outputting the fluids to the system pipeline; wherein the flow divider line and the flow converging line each comprise a main pipeline and two branch flow guide pipes of the same structure and symmetrical arrangement, which are connected to the main pipeline by a lofting design transition;

[0007] Both the shunt main pipeline and the confluence main pipeline are horizontally arranged, and the interfaces of the two main pipelines with the system pipeline are respectively located on the opposite sides of the shunt body; the measuring pipe interfaces of the two shunt branch diversion pipes and the confluence main pipeline interface are on the same side, and the measuring pipe interfaces of the two confluence branch diversion pipes and the shunt main pipeline interface are on the same side;

[0008] A smooth transition pipe section is used to connect the main pipeline and its corresponding branch diversion pipe, and within the shunt, the length dimensions of the transition pipe section and each branch diversion pipe are minimized.

[0009] Preferably, the two main pipelines have the same inner diameter as the system pipeline; the sum of the cross-sectional areas of the two branch diversion pipes corresponding to the main pipeline is not less than 1 / 2 of the cross-sectional area of the main pipeline and does not exceed the cross-sectional area of the main pipeline.

[0010] Preferably, the ends of the four branch diversion pipes connected to the measuring pipe have the same inner diameter as the measuring pipe, so that the fluid can smoothly flow into the measuring pipe after being shunted by the shunt, or smoothly flow into the shunt after flowing out of the measuring pipe.

[0011] Preferably, the shunt body includes a square base and a trapezoidal boss located on the top of the square base; the shunt main pipeline interface and the confluence main pipeline interface are respectively located on the left side and the right side of the square base, the two shunt branch diversion pipes are located on the right side of the trapezoidal boss, and the measuring pipe interfaces of the two confluence branch diversion pipes are located on the left side of the trapezoidal boss.

[0012] Preferably, the shunt main pipeline has a longer dimension than the confluence main pipeline to increase the horizontal pipe section distance at the inlet of the measuring pipe and ensure a stable flow field.

[0013] Preferably, the confluence branch diversion pipe has a longer dimension than the shunt branch diversion pipe, and the two confluence branch diversion pipes avoid interference with the shunt pipeline.

[0014] Preferably, the two main pipelines are in the same plane to reduce the overall height of the shunt and make the overall structure of the Coriolis flowmeter more compact.

[0015] Preferably, the main pipeline of the shunt and the corresponding branch diversion pipe are transitioned through lofting design to ensure smooth transition of the fluid within the shunt, reduce pressure loss and flow field interference.

[0016] Compared with the existing shunt structure, the shunt structure proposed by the present invention has a larger bending radius and a smaller bending angle, thereby reducing the large pressure drop and the change in flow velocity distribution caused by the change in the flow direction of the fluid inside the shunt. In addition, the shunt structure proposed by the present invention has a lower height compared with the existing shunt structure, which is convenient for the compact design of the Ω-type Coriolis flowmeter and increases its adaptability to the installation space. Description of the Drawings

[0017] Figure 1 Internal fluid flow diagram of a Coriolis flowmeter equipped with an existing diverter structure.

[0018] Figure 2 Internal fluid flow diagram of a Coriolis flowmeter equipped with the diverter proposed in the present invention.

[0019] Figure 3 Isometric view of the diverter proposed in the present invention.

[0020] Figure 4 Top view of the diverter proposed in the present invention.

[0021] Figure 5 Internal flow channel diagram of the diverter proposed in the present invention.

[0022] Figure 6 A - A sectional view of the diverter proposed in the present invention.

[0023] In the figure: 1. Main diverter pipeline; 2. Main confluence pipeline; 3. Diverter branch guide pipe; 4. Confluence branch guide pipe Detailed implementation manners

[0024] The following further elaborates and explains the present invention in conjunction with the detailed implementation manners. The described embodiments are only examples of the disclosed content and do not delimit the scope of limitation. Without conflict, the technical features of each embodiment of the present invention can be combined accordingly.

[0025] The object of the present invention is to provide a low - pressure - drop diverter applicable to an Ω - type Coriolis flowmeter, which is used to solve problems such as large pressure loss, drastic change in fluid flow direction, and over - sized installation dimensions existing in the existing diverter structure for an Ω - type Coriolis flowmeter. It improves the fluid pressure drop caused by the Coriolis flowmeter and realizes a compact design.

[0026] The internal fluid flow of a Coriolis flowmeter equipped with an existing diverter structure is as Figure 1 shown. The main pipeline of the diverting part and the branch guide pipe of the diverting part of the existing diverter structure are located on the same side of the diverter (the main pipeline of the confluence part and the branch guide pipe of the confluence part are also located on the same side of the diverter). Therefore, there are significant differences in the fluid flow directions in the system main pipeline and the measuring pipe. The diverter simultaneously serves the functions of changing the fluid flow direction and achieving uniform fluid distribution. Due to the diverter having a large turning angle and a small turning radius (see Figure 1 section A→B and section G→H in

[0027] To reduce the contribution of the shunt to the overall pressure drop of the Coriolis flowmeter and improve the interference of the shunt on the flow field, the present invention proposes a low-pressure-drop shunt applicable to an Ω-type Coriolis flowmeter. The main pipeline of the shunt part and the branch guide pipes of the shunt part are located on both sides of the shunt (the main pipeline of the confluence part and the branch guide pipes of the confluence part are also located on both sides of the shunt). The internal fluid flow direction of the Coriolis flowmeter with this structure is as shown in Figure 2 . Compared with the existing shunt structure, this improved structure has a smaller bending angle and a larger bending radius (see the section from A to B and the section from G to H in Figure 1 ), and significantly reduces the difference in the internal fluid flow direction between the system pipeline and the measuring pipe, reducing the fluid pressure drop introduced by the shunt and its interference on the flow field. In addition, under the same pressure drop conditions, the improved shunt structure has a smaller height than the existing shunt structure, which helps in the compact design of the Coriolis flowmeter and reduces its requirement for installation space.

[0028] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Figure 3 This is an isometric view of the shunt proposed by the present invention, which consists of two main pipelines and four branch guide pipes. Figure 4 This is a top view of the shunt proposed by the present invention.

[0029] As shown in Figure 3 , the low-pressure-drop shunt applicable to an Ω-type Coriolis flowmeter proposed by the present invention includes a shunt body. Inside the shunt body, there is a shunt pipeline for diverting the fluid in the system pipeline and transporting it to two measuring pipes, and a confluence pipeline for confluencing the fluids of the two measuring pipes and outputting them to the system pipeline. Both the shunt pipeline and the confluence pipeline are composed of a main pipeline and two corresponding branch guide pipes. The main pipeline and the corresponding branch guide pipes are transitioned through lofting design to ensure smooth transition of the fluid inside the shunt, reducing pressure loss and flow field interference.

[0030] Among them, the shunt main pipeline 1 and the confluence main pipeline 2 are both horizontally arranged. The interfaces of the two main pipelines with the system pipeline are respectively located on opposite sides of the shunt body; the measuring pipe interfaces of the two shunt branch guide pipes 3 and the confluence main pipeline interface are on the same side, and the measuring pipe interfaces of the two confluence branch guide pipes 4 and the shunt main pipeline interface are on the same side; the main pipeline and its corresponding branch guide pipe are connected by a smooth transition pipe section, and inside the shunt, the length dimensions of the transition pipe section and each branch guide pipe are minimized.

[0031] The two main pipelines have an inner diameter consistent with that of the system pipeline; the sum of the cross-sectional areas of the two branch diversion pipes corresponding to the main pipeline is not less than 1 / 2 of the cross-sectional area of the main pipeline and does not exceed the cross-sectional area of the main pipeline to ensure smooth fluid flow. The ends of the four branch diversion pipes connected to the measuring pipe have the same inner diameter as the measuring pipe so that the fluid can smoothly flow into the measuring pipe after being shunted by the shunt or smoothly flow into the shunt after flowing out of the measuring pipe.

[0032] In a specific embodiment of the present invention, the shunt body includes a square base and a trapezoidal boss located on the top of the square base. The top surface of the trapezoidal boss is smaller than the bottom surface, so that the left and right side surfaces form a certain inclination angle, which is convenient for butt joint installation with the measuring pipe. Preferably, the inclination angles of the left and right side surfaces are such that the measuring pipe is vertically installed with respect to the left and right side surfaces. The shunt main pipeline interface and the confluence main pipeline interface are respectively located on the left side surface and the right side surface of the square base. The two shunt branch diversion pipes are located on the right side surface of the trapezoidal boss, and the measuring pipe interfaces of the two confluence branch diversion pipes are located on the left side surface of the trapezoidal boss.

[0033] Based on Figure 4 , the shunt main pipeline and the confluence main pipeline of the present invention are on the same axis, their pipe diameters are equal, and the length of the shunt main pipeline is greater than the length of the confluence main pipeline to increase the distance of the inlet horizontal pipe section of the measuring pipe, ensure a stable flow field, and achieve a smaller pressure drop and a smaller flow field interference for the fluid. The branch diversion pipes in the confluence part have a greater length, and there is a large span between the two branch diversion pipes to avoid interference with the pipe sections in the shunt part.

[0034] Based on Figure 3 and Figure 4 , the main pipelines in the shunt part and the confluence part are in the same plane. The shunt branch diversion pipes are straight pipes, and the transition pipe section between the shunt branch diversion pipes and the shunt main pipeline is a smooth pipe section. The confluence branch diversion pipes should avoid interference with the shunt branch diversion pipes and the shunt main pipeline. And to avoid interference, the confluence branch diversion pipes can adopt a form of combined connection of several straight pipe sections and bent pipe sections. The transition pipe section between the confluence branch diversion pipes and the confluence main pipeline is a smooth pipe section. The length of the smooth pipe section should be as small as possible under the condition of ensuring smooth transition; and the bending angles of each pipe section in the smooth pipe section and the confluence branch diversion pipes are only as small as possible, preferably less than 90 degrees. The above design of the present invention can significantly reduce the overall height of the shunt. The internal structure of the shunt has strict requirements on the fluid flow direction.

[0035] In summary, the present invention provides a low-pressure-drop shunt structure applicable to an Ω-type Coriolis flowmeter to reduce the pressure loss introduced by the shunt and the interference to the flow field distribution, while reducing the overall height of the shunt and promoting the compact design of the Coriolis flowmeter.

[0036] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent for the present invention. For those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention.

Claims

1. A low-pressure-drop flow divider applicable to an Ω-type Coriolis flowmeter, comprising a flow divider body, characterized in that: A shunt pipeline for shunting the fluid in the system pipeline and conveying it to two measuring pipes, and a confluence pipeline for confluencing the fluids of the two measuring pipes and outputting them to the system pipeline are arranged in the shunt body; wherein, both the shunt pipeline and the confluence pipeline include a main pipeline and two branch guide pipes with the same structure and symmetrically arranged, which are transitionally connected to the main pipeline through lofting design. Both the shunt main pipeline and the confluence main pipeline are horizontally arranged, and the interfaces of the two main pipelines with the system pipeline are respectively located on opposite sides of the shunt body; the measuring pipe interfaces of the two shunt branch guide pipes and the confluence main pipeline interface are on the same side, and the measuring pipe interfaces of the two confluence branch guide pipes and the shunt main pipeline interface are on the same side. A smooth transition pipe section is used to connect the main pipeline and its corresponding branch guide pipe, and in the shunt, the length dimensions of the transition pipe section and each branch guide pipe are minimized.

2. The diverter according to claim 1, wherein The two main pipelines have the same inner diameter as the system pipeline; the sum of the cross-sectional areas of the two branch guide pipes corresponding to the main pipeline is not less than 1 / 2 of the cross-sectional area of the main pipeline and does not exceed the cross-sectional area of the main pipeline.

3. The diverter according to claim 1, characterized in that, The ends of the four branch guide pipes connected to the measuring pipes have the same inner diameter as the measuring pipes, so that the fluid can smoothly flow into the measuring pipes after being shunted by the shunt, or smoothly converge into the shunt after flowing out of the measuring pipes.

4. The diverter according to claim 1, characterized in that, The shunt body includes a square base and a trapezoidal convex platform located on the top of the square base; the shunt main pipeline interface and the confluence main pipeline interface are respectively located on the left side surface and the right side surface of the square base, the two shunt branch guide pipes are located on the right side surface of the trapezoidal convex platform, and the measuring pipe interfaces of the two confluence branch guide pipes are located on the left side surface of the trapezoidal convex platform.

5. The diverter according to claim 1, characterized in that, The shunt main pipeline has a longer dimension than the confluence main pipeline to increase the distance of the inlet horizontal pipe section of the measuring pipe and ensure the stability of the flow field.

6. The diverter according to claim 1, wherein The confluence branch guide pipe has a longer dimension than the shunt branch guide pipe, and the two confluence branch guide pipes avoid interfering with the shunt pipeline.

7. The diverter according to claim 1, wherein The two main pipelines are in the same plane to reduce the overall height of the shunt and make the overall structure of the Coriolis flowmeter more compact.

8. The diverter according to claim 1, wherein The shunt branch guide pipe adopts a straight pipe, and the transition pipe section between the shunt branch guide pipe and the shunt main pipeline is a smooth pipe section. The confluence branch guide pipe adopts a form of combined connection of several straight pipe sections and elbow pipe sections, and the transition pipe section between the confluence branch guide pipe and the confluence main pipeline is a smooth pipe section.

9. The diverter according to claim 8, wherein The bending angles of each smooth pipe section and each pipe section in the confluence branch guide pipe are less than 90°.

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