Bidirectional flow type balanced flowmeter

Abstract

The invention belongs to the technical field of flow meters, and particularly relates to a bidirectional flow type balance flow meter which comprises a measuring pipe, a flow meter, a flow meter and a flow meter. A pair of pore plates is connected into the measuring tube, the two pore plates are respectively used for performing pressure reduction on fluid in the measuring tube twice, a plurality of pressure reduction holes are uniformly formed in the pore plates, a first pressure taking tube is connected onto the measuring tube, and the first pressure taking tube is arranged between the two pore plates; the two straight pipes are respectively connected with a first pressure taking pipe, the two straight pipes are respectively connected with a second pressure taking pipe, the first pressure taking pipe is used for carrying out pressure measurement on fluid after first pressure reduction, and the differential pressure transmitter is connected with the first pressure taking pipe and the second pressure taking pipes; the processor is used for processing the pressure difference signal; the flow meter is fixedly arranged on the differential pressure transmitter; the two pore plates are arranged to depressurize the fluid twice, the pressure sensor obtains the pressure difference twice, the processor calculates the pressure difference twice to obtain the flow, and then the measurement result is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of flowmeters, and in particular to a bidirectional flow type balanced flowmeter. Background Art

[0002] In the field of flow measurement, differential pressure flowmeters are widely used due to their reliability and durability. There are various types of differential pressure flowmeters, including balanced flowmeters, Venturi flowmeters, etc. Differential pressure flowmeters are at the forefront of flowmeter use due to their mature technology, simple structure, stability and reliability, and wide application. Differential pressure flowmeters are instruments that measure flow based on the differential pressure generated by the flow detection component installed in the pipeline, known fluid conditions, and the geometric dimensions of the detection component and the pipeline.

[0003] The principle of differential pressure balanced flow addition is to increase the fluid flow rate through the throttling device, thereby reducing the fluid pressure, and calculate the fluid flow by measuring the pressure difference of the fluid before and after the throttling device; the existing throttling device does not significantly reduce the pressure difference, the pressure loss is small, and the flow calculated by a single pressure difference has low accuracy. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a bidirectional flow balanced flowmeter, which reduces the pressure of the fluid by providing two orifice plates and can measure the pressure before and after the two orifice plates respectively, aiming to solve the problems in the background technology.

[0005] In order to achieve the above technical objectives, the specific technical scheme of the present invention is as follows: a bidirectional flow type balanced flowmeter proposed by the present invention comprises: a measuring tube, both ends of which are fixedly connected with straight tubes; a pair of orifice plates are connected in the measuring tube, the two orifice plates are respectively used to reduce the pressure of the fluid in the measuring tube twice, and a plurality of pressure reducing holes are evenly arranged on the orifice plate, after the fluid passes through the pressure reducing holes on the orifice plate, the fluid velocity increases, according to Bernoulli's principle, the greater the fluid velocity, the smaller the pressure, so that the fluid is depressurized after passing through the orifice plate, and a first pressure taking pipe is connected to the measuring tube, the first taking pipe The pressure tube is arranged between the two orifice plates; and the two straight tubes are connected with a second pressure tube, the first pressure tube is used to measure the pressure of the fluid after the first pressure reduction, and one of the second pressure tubes is used to measure the pressure of the fluid before the first pressure reduction, and the other second pressure tube is used to measure the pressure of the fluid after the second pressure reduction; a differential pressure transmitter, the differential pressure transmitter is connected to the first pressure tube and the second pressure tube; the differential pressure transmitter is used to obtain the pressure difference between the first pressure tube and the two second pressure tubes; a processor is used to process the pressure difference signal; a flow meter is fixedly installed on the differential pressure transmitter.

[0006] As a preferred technical solution of the present invention, the inner walls at both ends of the measuring tube are provided with installation grooves that cooperate with the orifice plate, and the inner walls of the installation grooves are evenly provided with multiple limit strips along their circumference, and the orifice plate is provided with limit grooves that cooperate with the limit strips.

[0007] As a preferred technical solution of the present invention, a sealing ring is connected between the measuring tube and the straight tube, and sealing grooves for matching with the sealing ring are provided at both ends of the measuring tube.

[0008] As a preferred technical solution of the present invention, a rectifier tube is installed in the measuring tube, the rectifier tube is arranged between two orifice plates, and a pair of rectifier nets are arranged at both ends of the rectifier tube.

[0009] As a preferred technical solution of the present invention, both the first pressure-taking tube and the second pressure-taking tube are connected with valves.

[0010] As a preferred technical solution of the present invention, both ends of the straight tube are provided with a first flange, and both ends of the measuring tube are provided with a second flange that is matched and connected with the first flange.

[0011] As a preferred technical solution of the present invention, the outer wall of the measuring tube is provided with a noise reduction layer.

[0012] The beneficial effects of the present invention are: 1. The present invention reduces the pressure of the fluid twice by providing two orifice plates, and measures the pressure respectively before reducing the pressure, after the first pressure reduction, and after the second pressure reduction. The pressure difference is obtained twice by the pressure sensor, and the processor calculates the flow rate for the two pressure differences respectively, thereby making the measurement result more accurate.

[0013] 2. The measuring tube of the present invention is connected to the straight tube via a flange, and a mounting groove for matching with the orifice plate is provided on the measuring tube, thereby facilitating the disassembly and replacement of the orifice plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention provides a schematic structural diagram of a bidirectional flow type balanced flow meter.

[0015] Figure 2 The present invention is a cross-sectional schematic diagram of a bidirectional flow type balanced flowmeter.

[0016] Figure 3 This is a schematic diagram of the structure of the measuring tube proposed by the present invention.

[0017] Figure 4 This is a schematic diagram of the structure of the orifice plate proposed in the present invention.

[0018] In the figure: 1. Measuring tube; 2. Straight tube; 3. Differential pressure transmitter; 4. Flow meter; 5. First pressure tube; 6. Second pressure tube; 7. Valve; 8. Processor; 9. Orifice plate; 901. Pressure reducing hole; 902. Limiting groove; 10. Noise reduction layer; 11. Rectifier tube; 12. Rectifier net; 13. Sealing ring; 14. First flange; 15. Mounting groove; 16. Sealing groove; 17. Limiting strip; 18. Second flange. DETAILED DESCRIPTION

[0019] 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.

[0020] Embodiment: This embodiment discloses a bidirectional flow type balanced flow meter, such as Figure 1-Figure 4 As shown, it includes: a measuring tube 1, and straight tubes 2 are fixedly connected at both ends of the measuring tube 1; a pair of orifice plates 9 are connected inside the measuring tube 1, and the two orifice plates 9 are respectively used to reduce the pressure of the fluid in the measuring tube 1 twice, and a plurality of pressure reducing holes 901 are evenly arranged on the orifice plate 9, and the size and distribution of the pressure reducing holes 901 are designed according to formulas and test data. After the fluid passes through the pressure reducing holes 901 on the orifice plate 9, the fluid velocity increases. According to the Bernoulli principle, the greater the fluid velocity, the smaller the pressure, so that the fluid loses pressure after passing through the orifice plate 9, and the pressure difference before and after the orifice plate is obtained. The flow rate is calculated through the pressure difference shell. The specific calculation formula may include parameters such as the outflow coefficient, the expansion coefficient, the cross-sectional area of ​​the pressure reducing holes 901 on the orifice plate 9, the differential pressure output before and after the orifice plate 9, the diameter ratio, and the density of the measured fluid at a specific position.

[0021] A first pressure-taking tube 5 is connected to the measuring tube 1, and the first pressure-taking tube 5 is arranged between two orifice plates 9; and second pressure-taking tubes 6 are connected to the two straight tubes 2, the first pressure-taking tube 5 is used to measure the pressure of the fluid after the first pressure reduction, and one of the second pressure-taking tubes 6 is used to measure the pressure of the fluid before the first pressure reduction, and the other second pressure-taking tube 6 is used to measure the pressure of the fluid after the second pressure reduction; a differential pressure transmitter 3, the differential pressure transmitter 3 is connected to the first pressure-taking tube 5 and the second pressure-taking tube 6; the differential pressure transmitter 3 is used to obtain the pressure difference between the first pressure-taking tube 5 and the two second pressure-taking tubes 6; the processor 8 is used to process the pressure difference signal and calculate the flow rate through the pressure difference signal; the flow meter 4 is fixedly installed on the differential pressure transmitter 3; two pressure difference signals are obtained through the differential pressure transmitter 3, and the signals are sent to the processor 8, the two pressure difference signals are processed and calculated by the processor 8, the two calculated flow data are averaged, and the flow rate is displayed on the flow meter 4, thereby reducing the measurement error.

[0022] like Figure 3-Figure 4As shown, the inner walls at both ends of the measuring tube 1 are provided with mounting grooves 15 for mounting in cooperation with the orifice plate 9, and the inner walls of the mounting grooves 15 are evenly provided with a plurality of limiting strips 17 along their circumference, and the orifice plate 9 is provided with limiting grooves 902 for matching with the limiting strips 17; during installation, the limiting strips 17 are aligned with the limiting grooves 902, and the orifice plate 9 is installed to the bottom of the mounting grooves 15, and then the orifice plate 9 is rotated to make the limiting grooves 902 staggered with the limiting strips 17, and the orifice plate 9 is supported by the limiting strips 17, thereby ensuring the stable position of the orifice plate 9; and the orifice plate 9 is conveniently disassembled and replaced.

[0023] Preferably, a sealing ring 13 is connected between the measuring tube 1 and the straight tube 2 , and sealing grooves 16 for fitting with the sealing ring 13 are provided at both ends of the measuring tube 1 , so that the sealing between the measuring tube 1 and the straight tube 2 is ensured by the sealing ring 13 .

[0024] Preferably, a rectifier cylinder 11 is installed in the measuring tube 1. The rectifier cylinder 11 is arranged between two orifice plates 9, and a pair of rectifier nets 12 are provided at both ends of the rectifier cylinder 11. The depressurized fluid is rectified by the rectifier nets 12, which reduces the size of the fluid vortex and makes the pressure measurement more accurate.

[0025] Preferably, both the first pressure-taking pipe 5 and the second pressure-taking pipe 6 are connected with valves 7 to facilitate the control of the transmission of the pressure signal.

[0026] Preferably, a first flange 14 is provided at both ends of the straight tube 2, and a second flange 18 is provided at both ends of the measuring tube 1 to cooperate with the first flange 14. The first flange 14 is fixedly connected to the second flange 18 by a bolt assembly, which facilitates the installation and disassembly between the straight tube 2 and the measuring tube 1 and is easy to install and maintain.

[0027] Preferably, the outer wall of the measuring tube 1 is provided with a noise reduction layer 10, which is wrapped around the outer wall of the measuring tube 1 to reduce the impact sound when the fluid passes through the orifice plate 9, wherein the noise reduction layer 10 can adopt a porous plastic sleeve structure.

[0028] Working principle: before the fluid passes through the first orifice plate 9, the fluid is pressure-measured once through the second pressure-taking tube 6. Then, after the fluid passes through the first orifice plate 9, the fluid velocity increases and the pressure decreases. The fluid after the first pressure reduction is pressure-measured through the first pressure-taking tube 5. Then, the fluid passes through the second orifice plate 9 to reduce the pressure again. The fluid is pressure-measured again through another second pressure-taking tube 6. The differential pressure transmitter 3 obtains two pressure difference data, namely, the pressure difference between the first pressure-taking tube 5 and the two second pressure-taking tubes 6 respectively. The two pressure difference signals are processed and calculated by the processor 8 to obtain two flow data. The two flow data are averaged to measure a more accurate flow.

[0029] Finally, it should be noted that in the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations 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 orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bidirectional flow type balanced flow meter, characterized in that: include: A measuring tube (1), with straight tubes (2) fixedly connected at both ends of the measuring tube (1); A pair of orifice plates (9) are connected to the measuring tube (1), the two orifice plates (9) are respectively used to reduce the pressure of the fluid in the measuring tube (1) twice, and a plurality of pressure reduction holes (901) are evenly arranged on the orifice plates (9), and a first pressure taking tube (5) is connected to the measuring tube (1), and the first pressure taking tube (5) is arranged between the two orifice plates (9); The two straight tubes (2) are both connected to a second pressure-taking tube (6), the first pressure-taking tube (5) is used to measure the pressure of the fluid after the first pressure reduction, and one of the second pressure-taking tubes (6) is used to measure the pressure of the fluid before the first pressure reduction, and the other second pressure-taking tube (6) is used to measure the pressure of the fluid after the second pressure reduction; A differential pressure transmitter (3), the differential pressure transmitter (3) being connected to the first pressure-taking tube (5) and the second pressure-taking tube (6); the differential pressure transmitter (3) being used to obtain the pressure difference between the first pressure-taking tube (5) and the two second pressure-taking tubes (6); A processor (8), configured to process the pressure difference signal; The flow meter (4) is fixedly mounted on the differential pressure transmitter (3).

2. A bidirectional flow type balanced flowmeter according to claim 1, characterized in that: The inner walls of both ends of the measuring tube (1) are provided with mounting grooves (15) for matching with the orifice plate (9), the inner wall of the mounting groove (15) is evenly provided with a plurality of limit strips (17) along its circumference, and the orifice plate (9) is provided with limit grooves (902) for matching with the limit strips (17).

3. A bidirectional flow type balanced flowmeter according to claim 2, characterized in that: A sealing ring (13) is connected between the measuring tube (1) and the straight tube (2), and sealing grooves (16) for mounting in cooperation with the sealing ring (13) are provided at both ends of the measuring tube (1).

4. A bidirectional flow type balanced flowmeter according to claim 3, characterized in that: A rectifier cylinder (11) is installed in the measuring tube (1), the rectifier cylinder (11) is arranged between two orifice plates (9), and a pair of rectifier nets (12) are arranged at both ends of the rectifier cylinder (11).

5. A bidirectional flow type balanced flowmeter according to claim 4, characterized in that: The first pressure-taking pipe (5) and the second pressure-taking pipe (6) are both connected to valves (7).

6. A bidirectional flow type balanced flowmeter according to claim 5, characterized in that: Both ends of the straight tube (2) are provided with a first flange (14), and both ends of the measuring tube (1) are provided with a second flange (18) that is matched and connected to the first flange (14).

7. A bidirectional flow type balanced flowmeter according to claim 6, characterized in that: The outer wall of the measuring tube (1) is provided with a noise reduction layer (10).

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