Orifice plate type flowmeter

Abstract

The utility model belongs to the field of flow meters, particularly relates to an orifice plate type flow meter, and provides the following scheme aiming at the problems that an existing standard orifice plate flow meter is large in output differential pressure, large in pressure loss and not beneficial to effective utilization of energy sources: the orifice plate type flow meter comprises a first inner straight pipe and a second inner straight pipe, annular plates are integrally formed at the ends, close to each other, of the first internal straight pipe and the second internal straight pipe, a first sleeve is fixedly arranged on the outer wall of the first internal straight pipe, a second sleeve is fixedly arranged on the outer wall of the second internal straight pipe, and a positive pressure taking outlet and a negative pressure taking outlet are formed in the outer wall of the first sleeve and the outer wall of the second sleeve respectively. Compared with a standard orifice plate, the pressure tapping structure part is adjusted, the tapping position of the throttling device is changed, pressure loss caused by flow measurement can be effectively reduced while the outflow coefficient of the plate sheet is kept, the effects of energy conservation and emission reduction are achieved, meanwhile, the overall structure is simple and stable, and durability and accuracy of the flow meter are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flow meters, in particular to an orifice plate flow meter. Background Art

[0002] An orifice plate flowmeter is a differential pressure flowmeter and one of the most widely used flowmeters. Its operating principle is based on the Bernoulli equation and the continuity equation. When a fluid flows through a throttling device (orifice plate) installed in a pipeline, the local resistance of the orifice plate causes the fluid to contract at the orifice, increasing the flow rate and reducing the pressure. This creates a pressure differential across the orifice plate, which has a specific relationship with the flow rate.

[0003] However, the existing standard orifice flowmeter has a large output differential pressure, but also a large pressure loss, which is not conducive to the efficient use of energy.

[0004] Therefore, we propose an orifice flow meter. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the standard orifice plate flowmeter in the prior art, that is, the output differential pressure is large, but the pressure loss is also large, which is not conducive to the effective utilization of energy, and to propose an orifice plate flowmeter.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] An orifice flow meter, comprising:

[0008] a first inner straight tube and a second inner straight tube, wherein an annular plate is integrally formed at one end of the first inner straight tube and the second inner straight tube that are close to each other, a first sleeve is fixedly provided on the outer wall of the first inner straight tube, a second sleeve is fixedly provided on the outer wall of the second inner straight tube, and a positive pressure outlet and a negative pressure outlet are respectively provided on the outer walls of the first sleeve and the second sleeve;

[0009] A positive pressure annular chamber is provided between the first inner straight tube and the first sleeve, a positive pressure taking hole is provided on the outer wall of the first inner straight tube, a positive pressure induction hole is provided on the outer wall of the first sleeve, both the positive pressure taking hole and the positive pressure induction hole are connected to the positive pressure annular chamber, and the positive pressure induction hole is connected to the positive pressure taking outlet;

[0010] A negative pressure annular chamber is provided between the second inner straight tube and the second sleeve, a negative pressure taking hole is provided on the outer wall of the second inner straight tube, a negative pressure induction hole is provided on the outer wall of the second sleeve, both the negative pressure taking hole and the negative pressure induction hole are connected to the negative pressure annular chamber, and the negative pressure induction hole is connected to the negative pressure taking outlet;

[0011] A same plate is fixed between the inner walls of the first inner straight tube and the second inner straight tube. The plate is cross-shaped as a whole and has a ring-shaped middle portion.

[0012] In a possible design, outer walls of the first inner straight pipe and the second inner straight pipe at ends away from each other are both fixedly connected to the pipeline to be tested via flanges.

[0013] In a possible design, positioning grooves are formed on the inner walls of the first sleeve and the second sleeve, and the annular plate is located in the positioning grooves.

[0014] In a possible design, the number of the positive pressure taking holes and the number of the negative pressure taking holes are both four.

[0015] In a possible design, the distance between the positive pressure tapping hole and the plate is greater than the distance between the negative pressure tapping hole and the plate.

[0016] In a possible design, outer walls of the positive pressure outlet and the negative pressure outlet are both provided with external threads.

[0017] In this application, when in use, the fluid passes through the flow meter from the measured pipeline and is blocked by the plate, resulting in fluids with different pressures on the left and right sides of the plate, with positive pressure on the left side of the plate and negative pressure on the right side of the plate. The fluids with different pressures enter the corresponding positive pressure annular chamber and negative pressure annular chamber through the positive pressure taking hole and negative pressure taking hole respectively, and then enter the positive pressure taking outlet and negative pressure taking outlet respectively through the positive pressure inlet hole and negative pressure inlet hole connected to the chamber. The positive pressure taking outlet and negative pressure taking outlet can be connected to external devices such as transmitters to measure and calculate the differential pressure signal, and send it to the DCS system or host computer.

[0018] Among them, the flow coefficient of the plate is the same as that of the standard orifice plate, but because its opening positions are evenly distributed, the blocked medium can pass through more smoothly, so the resistance generated is smaller, so the pressure loss is smaller, it is not easy to cause the system to vibrate, and the efficiency of the entire system is saved.

[0019] Beneficial effects: In the utility model, the orifice plate flowmeter, through the arrangement of multiple structures such as the plate, the positive pressure taking hole and the negative pressure taking hole, adjusts the pressure taking structure part and changes the opening position of the throttling device compared with the standard orifice plate. While maintaining the outflow coefficient of the plate, it can effectively reduce the pressure loss caused by flow measurement, thereby achieving the effect of energy saving and emission reduction.

[0020] In this utility model, the orifice plate flowmeter is designed with a first internal straight tube and a second internal straight tube, and an annular plate integrally formed at one end thereof, enhancing the structural integrity and stability. The first and second sleeves are respectively fixed to the outer walls of the first and second internal straight tubes, providing a solid foundation for pressure measurement. This design not only simplifies installation but also improves the durability and accuracy of the flowmeter.

[0021] In the utility model, compared with the standard orifice plate, the pressure taking structure is adjusted and the opening position of the throttling device is changed. While maintaining the outflow coefficient of the plate, the pressure loss caused by flow measurement can be effectively reduced, achieving the effect of energy saving and emission reduction. At the same time, the overall structure is simple and stable, which improves the durability and accuracy of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an orifice plate flowmeter proposed in the utility model;

[0023] Figure 2 This is a schematic cross-sectional view of an orifice plate flowmeter proposed in the present invention;

[0024] Figure 3 This is a partial three-dimensional structural schematic diagram of an orifice plate flowmeter proposed in the utility model.

[0025] In the figure: 1. First internal straight pipe; 2. Second internal straight pipe; 3. First casing; 4. Second casing; 5. Positive pressure annular chamber; 6. Negative pressure annular chamber; 7. Positive pressure tapping hole; 8. Negative pressure tapping hole; 9. Plate; 10. Annular plate; 11. Positioning groove; 12. Flange; 13. Positive pressure outlet; 14. Negative pressure outlet; 15. Pipeline under test; 16. Positive pressure inlet hole; 17. Negative pressure inlet hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Example 1: Reference Figure 1-Figure 3 , an orifice flow meter, comprising:

[0028] A first internal straight tube 1 and a second internal straight tube 2 are integrally formed with an annular plate 10 at their mutually adjacent ends. A first sleeve 3 is fixedly provided on the outer wall of the first internal straight tube 1, and a second sleeve 4 is fixedly provided on the outer wall of the second internal straight tube 2. The main function of these two sleeves is to provide a stable pressure-taking environment and protect the internal structure. A positive pressure outlet 13 and a negative pressure outlet 14 are respectively provided on the outer walls of the first sleeve 3 and the second sleeve 4. The positive pressure outlet 13 and the negative pressure outlet 14 can be connected to an external transmitter or other device to measure and calculate the differential pressure signal, and transmit it to a DCS system or a host computer.

[0029] A positive pressure annular chamber 5 is provided between the first inner straight tube 1 and the first sleeve 3. A positive pressure taking hole 7 is provided on the outer wall of the first inner straight tube 1. A positive pressure inlet hole 16 is provided on the outer wall of the first sleeve 3. Both the positive pressure taking hole 7 and the positive pressure inlet hole 16 are connected to the positive pressure annular chamber 5. The positive pressure inlet hole 16 is connected to the positive pressure outlet 13. The fluid can enter the positive pressure annular chamber 5 from the positive pressure taking hole 7, and then enter the positive pressure outlet 13 from the positive pressure annular chamber 5 through the positive pressure taking hole 16.

[0030] A negative pressure annular chamber 6 is provided between the second inner straight tube 2 and the second sleeve 4. A negative pressure taking hole 8 is provided on the outer wall of the second inner straight tube 2, and a negative pressure induction hole 17 is provided on the outer wall of the second sleeve 4. Both the negative pressure taking hole 8 and the negative pressure induction hole 17 are connected to the negative pressure annular chamber 6, and the negative pressure induction hole 17 is connected to the negative pressure outlet 14. The fluid can enter the negative pressure annular chamber 6 from the negative pressure taking hole 8, and then enter the negative pressure outlet 14 from the negative pressure annular chamber 6 through the negative pressure taking hole 17.

[0031] A common plate 9 is fixed between the inner walls of the first inner straight tube 1 and the second inner straight tube 2. The plate 9 is cross-shaped as a whole and annular in the middle, which optimizes the flow path of the fluid and improves the accuracy of the measurement.

[0032] Example 2: An improved orifice plate flowmeter based on Example 1;

[0033] In another aspect of this embodiment, the outer walls of the first inner straight pipe 1 and the second inner straight pipe 2 at the ends away from each other are fixedly connected to the measured pipe 15 via flanges 12. This connection method is not only firm and reliable, but also easy to disassemble and repair when necessary.

[0034] In another aspect of this embodiment, the inner walls of the first sleeve 3 and the second sleeve 4 are both provided with positioning grooves 11, and the annular plate 10 is located in the positioning grooves 11. This design not only ensures the accurate positioning of the annular plate 10, but also improves the connection strength between it and the sleeve.

[0035] In another aspect of this embodiment, there are four positive pressure holes 7 and four negative pressure holes 8. This design not only improves the uniformity and accuracy of pressure measurement, but also helps to reduce errors caused by uneven fluid flow.

[0036] In another aspect of this embodiment, the distance between the positive pressure hole 7 and the plate 9 is greater than the distance between the negative pressure hole 8 and the plate 9. This design can better reflect the pressure changes when the fluid passes through the plate 9, thereby further improving the accuracy of flow measurement.

[0037] In another aspect of this embodiment, the outer walls of the positive pressure outlet 13 and the negative pressure outlet 14 are both provided with external threads, which can facilitate the connection of external transmitters and other devices to measure and calculate differential pressure signals and send them to the DCS system or host computer.

[0038] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An orifice flow meter, characterized in that: include: A first internal straight tube (1) and a second internal straight tube (2), wherein the ends of the first internal straight tube (1) and the second internal straight tube (2) close to each other are integrally formed with an annular plate (10), a first sleeve (3) is fixedly provided on the outer wall of the first internal straight tube (1), a second sleeve (4) is fixedly provided on the outer wall of the second internal straight tube (2), and a positive pressure outlet (13) and a negative pressure outlet (14) are respectively provided on the outer walls of the first sleeve (3) and the second sleeve (4); A positive pressure annular chamber (5) is provided between the first inner straight tube (1) and the first sleeve (3); a positive pressure taking hole (7) is provided on the outer wall of the first inner straight tube (1); a positive pressure inlet hole (16) is provided on the outer wall of the first sleeve (3); the positive pressure taking hole (7) and the positive pressure inlet hole (16) are both connected to the positive pressure annular chamber (5); and the positive pressure inlet hole (16) is connected to the positive pressure outlet (13); A negative pressure annular chamber (6) is provided between the second inner straight tube (2) and the second sleeve (4); a negative pressure taking hole (8) is provided on the outer wall of the second inner straight tube (2); a negative pressure induction hole (17) is provided on the outer wall of the second sleeve (4); the negative pressure taking hole (8) and the negative pressure induction hole (17) are both connected to the negative pressure annular chamber (6); and the negative pressure induction hole (17) is connected to the negative pressure taking outlet (14); A common plate (9) is fixedly provided between the inner walls of the first inner straight tube (1) and the second inner straight tube (2); the plate (9) is cross-shaped as a whole and its middle portion is annular.

2. The orifice flowmeter according to claim 1, characterized in that: The outer walls of the first inner straight pipe (1) and the second inner straight pipe (2) at one end away from each other are both fixedly connected to the measured pipeline (15) via a flange (12).

3. The orifice flowmeter according to claim 2, characterized in that: The inner walls of the first sleeve (3) and the second sleeve (4) are both provided with positioning grooves (11), and the annular plate (10) is located in the positioning grooves (11).

4. The orifice flow meter according to claim 3, characterized in that: The number of the positive pressure taking holes (7) and the number of the negative pressure taking holes (8) are both four.

5. The orifice flowmeter according to claim 4, characterized in that: The distance between the positive pressure taking hole (7) and the plate (9) is greater than the distance between the negative pressure taking hole (8) and the plate (9).

6. The orifice flow meter according to claim 5, characterized in that: The outer walls of the positive pressure outlet (13) and the negative pressure outlet (14) are both provided with external threads.

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