Flow divider and coriolis flowmeter

Abstract

Disclosed in the present invention are a flow divider and a Coriolis flowmeter, wherein the flow divider is of a cylindrical structure, N branch flow guide ports are formed in the cylinder bottom of the flow divider, and N is a positive integer not less than 2. The branch flow guide ports are non-circular. The total area of the N branch flow guide ports is S1, and the flow divider satisfies the following conditions: if the N non-circular branch flow guide ports are replaced with N circular branch flow guide ports, and the maximum total area of the N circular branch flow guide ports is S2, S1>S2. Compared with the prior art, the present invention can increase the integral cross sectional area of the N branch flow guide ports of the flow divider, and under the condition of certain pressure, the flow of the flow divider is greatly increased, and the pressure loss is greatly reduced.

Description

Flow divider and Coriolis flowmeter Technical Field

[0001] The present invention relates to the technical field of liquid diversion, and in particular to a diverter and a Coriolis flowmeter. Background Art

[0002] The Coriolis flowmeter generally has a diverter, which is a cylindrical structure. The bottom of the diverter is provided with a plurality of branch diverters with the same cross-sectional area, the top of the diverter is the main diverter, and the interior of the diverter is a diversion channel connecting the main diverter and the branch diverter. In the prior art, the cross-sections of the diversion channel, the main diverter and the branch diverter are all circular, and the cross-section of the diversion channel is the same as the cross-section of the main diverter. The main diverter and the branch diverter are both used to connect pipes with circular ends. Therefore, by providing a diverter, the diversion or confluence of the medium can be achieved.

[0003] 1 to 3 , since the ends of the flow tubes are circular and adjacent flow tubes must be spaced a certain distance apart, the ratio of the cross-sectional area of ​​the branch diversion opening to the cross-sectional area of ​​the main diversion opening is usually less than 50%. The cross-sectional area of ​​the main diversion opening is not effectively utilized, resulting in an increase in pressure loss and a decrease in the flow range.

[0004] Summary of the Invention

[0005] The object of the present invention is to provide a flow divider and a Coriolis flowmeter for solving the technical problems existing in the above-mentioned prior art and improving the ratio of the cross-sectional area of ​​the branch diversion port to the cross-sectional area of ​​the main diversion port.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention discloses a flow divider, which is a cylindrical structure. The bottom of the flow divider is provided with N branch flow guide ports, where N is a positive integer not less than 2.

[0008] The branch diversion ports are non-circular; the total area of ​​the N branch diversion ports is S1, and the diverter satisfies the following conditions: if the N non-circular branch diversion ports are replaced with N circular branch diversion ports, the maximum total area of ​​the N circular branch diversion ports is S2, then S1>S2.

[0009] Preferably, the shapes of the two adjacent side edges of two adjacent branch guide ports are both straight lines.

[0010] Preferably, the branch guide port is fan-shaped.

[0011] Preferably, the central angle of the sector corresponding to each branch guide port is 360° / N.

[0012] Preferably, the branch guide port is square.

[0013] Preferably, the N branch guide ports are distributed in a rectangular array.

[0014] Preferably, among the two adjacent side edges of two adjacent branch guide ports, one of the side edges has a protrusion, and the other side edge has a groove matching the protrusion.

[0015] Preferably, the branch guide ports are elliptical and arranged in a row with their minor axes collinear.

[0016] The present invention also discloses a Coriolis flowmeter, comprising a diverter and N flow tubes, wherein the diverter adopts any one of the above-mentioned diverters, and the N branch flow guide ports of the diverter are respectively connected to a flow tube corresponding to itself, and the end of the flow tube used to connect to the branch flow guide port is provided with a connection port matching the shape of the branch flow guide port.

[0017] Preferably, the flow splitter includes a first flow splitter and a second flow splitter, the first end of the flow tube is connected to the branch flow guide port of the first flow splitter, and the second end of the flow tube is connected to the branch flow guide port of the second flow splitter.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention replaces the circular branch diversion openings in the prior art with non-circular branch diversion openings to increase the overall cross-sectional area of ​​the branch diversion openings. Under a constant pressure, the flow rate of the flow diverter is greatly increased and the pressure loss is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is a schematic diagram of the structure of an existing flow splitter (connecting four flow tubes);

[0022] FIG2 is another structural schematic diagram of an existing flow splitter (connecting two flow tubes);

[0023] FIG3 is a schematic diagram of the distribution of branch diversion ports in FIG2 ;

[0024] FIG4 is a schematic structural diagram of Example 1 of a flow splitter according to an embodiment of the present invention;

[0025] FIG5 is a schematic diagram of the distribution of branch diversion ports in FIG4 ;

[0026] FIG6 is another structural diagram of Example 1 of the flow splitter according to an embodiment of the present invention;

[0027] FIG7 is a schematic diagram of a flow tube corresponding to the flow splitter shown in FIG6 ;

[0028] FIG8 is a partial enlarged view of point A in FIG7;

[0029] FIG9 is another structural diagram of Example 1 of the flow splitter according to an embodiment of the present invention;

[0030] FIG10 is a schematic diagram of a flow tube corresponding to the flow splitter shown in FIG9 ;

[0031] FIG11 is a partial enlarged view of point B in FIG10 ;

[0032] FIG12 is a schematic diagram of the distribution of branch guide ports of Example 2 of the flow splitter according to an embodiment of the present invention;

[0033] FIG13 is a schematic diagram of the distribution of branch guide ports of Example 3 of the flow splitter according to an embodiment of the present invention;

[0034] FIG14 is a schematic structural diagram of a Coriolis flowmeter according to an embodiment of the present invention.

[0035] Explanation of reference numerals: 10 - splitter; 11 - main flow outlet; 12 - branch flow outlet; 20 - flow tube; 100 - Coriolis flowmeter. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0037] The object of the present invention is to provide a flow divider and a Coriolis flowmeter for solving the technical problems existing in the above-mentioned prior art and improving the ratio of the cross-sectional area of ​​the branch diversion port to the cross-sectional area of ​​the main diversion port.

[0038] To make the above-mentioned objects, features and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. In the accompanying drawings, the shaded portion is only used to indicate the position of the branch guide port 12 and is not used to indicate the cutaway area.

[0039] 4 to 13 , this embodiment provides a flow divider 10 having a cylindrical structure. The bottom of the flow divider 10 is provided with N branch flow guide ports 12 , where N is a positive integer not less than 2. It is understood that the cross-sectional area of ​​each branch flow guide port 12 should be the same to ensure that the flow rate of each branch flow guide port 12 is the same or substantially the same.

[0040] The branch diversion openings 12 are non-circular. The total area of ​​the N branch diversion openings 12 is S1, and the diverter 10 satisfies the following condition: if the N non-circular branch diversion openings 12 are replaced with N circular branch diversion openings 12, the maximum total area of ​​the N circular branch diversion openings 12 is S2, then S1>S2.

[0041] The working principle of the diverter 10 in this embodiment is as follows:

[0042] It should be noted that for two adjacent circular branch guide ports 12, their adjacent sides are both convex arcs, so there is a certain gap. This embodiment replaces N circular branch guide ports 12 with N non-circular branch guide ports 12 to increase the overall cross-sectional area of ​​the N branch guide ports 12. Under constant pressure, the flow rate of the diverter 10 is greatly increased and the pressure loss is greatly reduced.

[0043] There are many forms of the non-circular branch guide port 12, and those skilled in the art can choose according to actual needs. The following three examples are used to illustrate, and the actual implementation method is not limited to this.

[0044] Example 1:

[0045] Referring to Figures 4 to 11 , the adjacent sides of two adjacent branch outlets 12 are both straight lines (i.e., the two adjacent branch outlets 12 are separated by a straight line dividing strip). The two straight lines can be completely parallel or slightly inclined (for example, at an angle of 5°). Obviously, this shape can reduce the area between the two adjacent branch outlets 12.

[0046] For example, referring to Figures 4 to 6, the branch diversion port 12 may be fan-shaped. The fan-shaped here may refer to a mathematical fan-shaped figure, that is, a figure formed by an arc and two radii passing through the ends of the arc; the fan-shaped here may also refer to a fan-shaped surface, that is, a small part is dug out near the center of the fan-shaped figure.

[0047] The central angle of the sector corresponding to each branch diversion opening 12 is preferably 360° / N, so that the sum of the central angles corresponding to the N branch diversion openings 12 is 360°. In this case, the N branch diversion openings 12 are evenly distributed along the circumference with the geometric center of the bottom of the diverter 10 as the center, and the adjacent sides of two adjacent branch diversion openings 12 are completely parallel.

[0048] It is understood that the sector shape in this example is only used to describe the general shape of the branch guide port 12. It is understood that after setting arc transitions or chamfers at the corners of the sector shape, it still belongs to the sector shape referred to in this example.

[0049] For another example, referring to FIG9 , the branch guide openings 12 may also be square. Here, square may refer to a square or a rectangle. The N branch guide openings 12 are preferably arranged in a rectangular array, i.e., the adjacent sides of two adjacent branch guide openings 12 are parallel to each other.

[0050] Example 2:

[0051] Referring to Figure 12 , two adjacent side edges of two adjacent branch guide ports 12 have a protrusion on one side and a groove on the other side that matches the protrusion (i.e., the two adjacent branch guide ports 12 are separated by a bent dividing strip). Matching here refers to position matching, i.e., the protrusion at least partially extends into the groove. In this example, the area of ​​the middle region between the two adjacent branch guide ports 12 is reduced by matching the protrusion with the groove.

[0052] It should be noted that, the two adjacent side edges of two adjacent branch guide ports 12 can be provided with both protrusions and grooves.

[0053] Example 3:

[0054] Referring to Figure 13 , the branching guide ports 12 are elliptical and arranged in a row with their minor axes collinear. It can be understood that when the minor axis of the ellipse is equal to the diameter of the circle, the major axis of the ellipse is greater than the diameter of the circle, and the ellipse and the circle are concentric, the cross-sectional area of ​​the ellipse is greater than that of the circle. Therefore, compared to the prior art, this example can increase the overall cross-sectional area of ​​the N branching guide ports 12.

[0055] Referring to FIG14 , this embodiment further provides a Coriolis flowmeter 100 comprising a flow splitter 10 and N flow tubes 20. The flow splitter 10 employs any of the aforementioned flow splitters 10 . Each of the N branching flow guide ports 12 of the flow splitter 10 is connected to a corresponding flow tube 20. The ends of the flow tubes 20 (herein, the ends of the flow tubes 20 intended for connection to the branching flow guide ports 12) are provided with connection ports that match the shape of the branching flow guide ports 12.

[0056] Since the Coriolis flowmeter 100 of this embodiment adopts the above-mentioned flow splitter 10, it also has the corresponding advantages of the above-mentioned flow splitter 10, which will not be described in detail here.

[0057] Exemplarily, the flow splitter 10 includes a first flow splitter and a second flow splitter. The first end of the flow tube 20 is connected to the branch flow guide port 12 of the first flow splitter, and the second end of the flow tube 20 is connected to the branch flow guide port 12 of the second flow splitter. The flow direction of the medium in the flow tube 20 is from the first flow splitter to the second flow splitter. The first flow splitter functions to split the medium into N streams, and the second flow splitter functions to merge the N streams into one stream.

[0058] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A flow divider, which is a cylindrical structure, has N branch flow guide ports at the bottom of the flow divider, where N is a positive integer not less than 2, and is characterized in that: The branch flow guide openings are non-circular; the total area of ​​the N branch flow guide openings is S1, and the diverter satisfies the following conditions: if the N non-circular branch flow guide openings on the bottom of the cylinder are replaced with N circular branch flow guide openings, the maximum total area of ​​the N circular branch flow guide openings is S2, then S1>S2.

2. The flow divider according to claim 1, characterized in that: The shapes of the two adjacent side edges of two adjacent branch guide ports are both straight lines.

3. The flow divider according to claim 2, characterized in that: The branch guide port is fan-shaped.

4. The flow divider according to claim 3, characterized in that: The sector center angle corresponding to each branch guide port is 360° / N.

5. The flow divider according to claim 2, characterized in that: The branch diversion port is square.

6. The flow divider according to claim 5, characterized in that: The N branch guide ports are distributed in a rectangular array.

7. The flow divider according to claim 1, characterized in that: Two adjacent side edges of two adjacent branch guide ports, one of the side edges has a protrusion, and the other side edge has a groove matching the protrusion.

8. The flow divider according to claim 1, characterized in that: The branch guide ports are elliptical and arranged in a row with their minor axes collinear.

9. A Coriolis flowmeter, comprising a flow divider and N flow tubes, characterized in that: The diverter adopts the diverter as described in any one of claims 1 to 8, and the N branch diverter ports of the diverter are respectively connected to a flow tube corresponding to themselves, and the end of the flow tube used to connect to the branch diverter is provided with a connection port matching the shape of the branch diverter.

10. The Coriolis flowmeter according to claim 9, characterized in that: The flow divider includes a first flow divider and a second flow divider. The first end of the flow tube is connected to the branch flow guide port of the first flow divider, and the second end of the flow tube is connected to the branch flow guide port of the second flow divider.

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