A step-by-step flow measurement sensor and its application

Abstract

The present invention discloses a step-by-step flow measurement sensor and application, belonging to the technical field of flow measurement sensors. It includes a sensor body flange, a fixed inner diameter measuring tube, a first variable inner diameter measuring tube, a variable inner diameter throttling piece, and a second variable inner diameter measuring tube; the number of fixed inner diameter measuring tubes is 2; the fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling piece, and the second variable inner diameter measuring tube are connected in sequence in the order of fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling piece, the second variable inner diameter measuring tube, and the fixed inner diameter measuring tube, and are arranged inside the sensor body flange; the sensor flange is provided with a positive pressure nozzle, which is connected to the first variable inner diameter measuring tube; the sensor flange is provided with a negative pressure nozzle, which is connected to the second variable inner diameter measuring tube. The inner diameter can be dynamically selected for more accurate garage.

Description

Technical Field

[0001] The present application relates to the technical field of flow measurement sensors, and in particular to a step-by-step flow measurement sensor and its application. Background Art

[0002] The statements in this section merely mention background technology related to the present application and do not necessarily constitute prior art.

[0003] The working principle of differential pressure flow sensor is to measure the flow rate based on the law of conservation of mass (continuity equation) and conservation of energy (Bernoulli equation) of fluid in closed pipe. The current flow measurement sensor cannot meet the measurement of process pipeline flow with high temperature (temperature greater than 550℃), high pressure (above 10Mpa), high flow velocity impact, or low flow velocity (flow velocity of liquid below 0.5m / s, gas below 3m / s), high viscosity, low pressure loss, and wide range of calibers (DN10~DN2000).

[0004] Since high-viscosity media have extremely low flow rates and high viscosity, there are currently almost no flow measurement devices that can meet the measurement requirements. Existing measurement devices generally use wedge-shaped flow sensors. However, due to the wedge-shaped pressure-taking throttling body, the wedge-shaped flow sensor cannot change the flow rate of the medium in the local measuring tube, and the physical signal generated is weak, which cannot be accurately measured. Since there is no other form of flow measurement method, it can only be used reluctantly.

[0005] Nozzle measuring devices are generally used for high temperature and high pressure measurement, and other measuring devices can hardly meet the requirements. Since the nozzle flowmeter range ratio is 1:3, small flow cannot be measured, and there are safety hazards due to high temperature and high pressure, high flow rate, and metal performance degradation. Summary of the invention

[0006] In order to address the deficiencies of the prior art, the present application provides a step-by-step flow measurement sensor, flow measurement method and flow measurement system that can dynamically select the inner diameter according to specific flow parameters such as actual measurement medium performance, operating temperature, working pressure, etc., so as to accurately measure the flow.

[0007] In a first aspect, the present application provides a step-by-step flow measurement sensor;

[0008] A step-by-step flow measurement sensor, comprising a sensor body flange, a fixed inner diameter measuring tube, a first variable inner diameter measuring tube, a variable inner diameter throttling element, and a second variable inner diameter measuring tube; the number of the fixed inner diameter measuring tubes is 2;

[0009] The fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling piece and the second variable inner diameter measuring tube are connected in sequence in the order of the fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling piece, the second variable inner diameter measuring tube and the fixed inner diameter measuring tube, and are arranged inside the sensor body flange;

[0010] The sensor flange is provided with a positive pressure nozzle, and the positive pressure nozzle is communicated with the first variable inner diameter measuring tube;

[0011] The sensor flange is provided with a negative pressure nozzle, and the negative pressure nozzle is communicated with the second variable inner diameter measuring tube.

[0012] By adopting the above technical scheme, it is possible to dynamically select the inner diameters of the first variable inner diameter measuring tube, the second variable inner diameter measuring tube, and the variable inner diameter throttling device according to specific flow parameters such as actual measurement medium performance, working temperature, and working pressure, so as to meet the measurement of process pipeline flow with high temperature, high pressure, high flow rate, low flow rate, and high viscosity, with less pressure loss, wide caliber adaptability, stable and reliable mechanical properties, high accuracy, and a range ratio of more than 1:20.

[0013] According to a further technical solution, the inner diameter of the fixed inner diameter measuring tube is larger than the inner diameter of the first variable inner diameter measuring tube, and the inner diameter of the first variable inner diameter measuring tube is larger than the inner diameter of the second variable inner diameter measuring tube.

[0014] By adopting the above technical solution, the measured fluid passes through the fixed inner diameter measuring tube, the first variable inner diameter measuring tube and the second variable inner diameter measuring tube in sequence, the flow rate of the measured fluid is accelerated, and the pressure is taken before and after the variable inner diameter throttling device to obtain a differential pressure signal. The generated physical signal is strong and the measurement accuracy is high, which can solve the measurement of small flow, low flow rate and high viscosity media.

[0015] According to a further technical solution, the first variable inner diameter measuring tube is provided with a positive pressure taking hole, and the positive pressure taking hole penetrates the sensor body flange; the positive pressure taking nozzle is arranged on the sensor body flange through the positive pressure taking hole;

[0016] The second variable inner diameter measuring tube is provided with a negative pressure taking hole, and the negative pressure taking hole penetrates the sensor body flange; the negative pressure taking nozzle is arranged on the sensor body flange through the negative pressure taking hole.

[0017] In a further technical solution, one end of the first variable inner diameter measuring tube connected to the variable inner diameter measuring tube is configured to be conical along the flow direction;

[0018] The end of the second variable inner diameter measuring tube communicating with the variable inner diameter measuring tube is configured to be tapered in the opposite direction of the flow direction.

[0019] By adopting the above technical solution, the flow of fluid is facilitated and the inflow and outflow of fluid is easy.

[0020] According to a further technical solution, the immutable inner diameter measuring tube, the first immutable inner diameter measuring tube and the second immutable inner diameter measuring tube are all made of metal.

[0021] By adopting the above technical solution, the metal measuring tube can adapt to the measurement of various fluid materials, can withstand an internal medium temperature of up to 850°C, can withstand a pressure of up to 42Mpa, has high viscosity, and is resistant to corrosion and dirt.

[0022] According to a further technical solution, the inner diameter of the variable inner diameter throttling element is smaller than the inner diameter of the first variable inner diameter measuring tube, and the inner diameter of the variable inner diameter throttling element is smaller than the inner diameter of the second variable inner diameter measuring tube.

[0023] According to a further technical solution, the outer diameter of the variable inner diameter throttling element is larger than the inner diameter of the second variable inner diameter measuring tube.

[0024] By adopting the above technical solution, when the fluid enters the step-by-step flow measurement sensor, force will be applied to the variable inner diameter throttling device along the flow direction of the fluid. At this time, the second variable inner diameter measuring tube provides support for the variable inner diameter throttling device, so that the variable inner diameter throttling device has stable mechanical properties under high temperature, high pressure, and high flow rate impact, and is not easy to fall off, thereby avoiding production safety accidents.

[0025] In a second aspect, the present application provides a flow measurement method based on the above-mentioned step-type flow measurement sensor;

[0026] A flow measurement method, comprising:

[0027] S1. Connect the step-by-step flow measurement sensor to the connection flange of the process pipeline of the flow to be measured through the sensor body flange;

[0028] S2, the fluid to be measured passes through the fixed inner diameter measuring tube, the first variable inner diameter measuring tube and the second variable inner diameter measuring tube in sequence, and the pressure signals P1 and P2 are taken in sequence before and after the variable inner diameter throttling element along the direction of the fluid flow, and the differential pressure is calculated;

[0029] S3. Calculate flow based on differential pressure, known fluid conditions, step-by-step flow measurement sensor, and process piping geometry.

[0030] In a third aspect, the present application provides a flow measurement system;

[0031] A flow measurement system comprises the step-by-step flow measurement sensor as claimed in claim 1.

[0032] Compared with the prior art, the beneficial effects of this application are:

[0033] 1. The generated physical signal is particularly strong and has high measurement accuracy, which can meet the measurement of small flow, low flow rate and high viscosity media;

[0034] 2. Under the impact of high temperature, high pressure and high flow rate, the mechanical properties are stable and cannot fall off, avoiding production safety accidents. It has high accuracy and a range ratio of more than 1:20;

[0035] 3. It can adapt to the measurement of various fluid materials, can withstand internal medium temperatures up to 850°C, can withstand pressures up to 42Mpa, has high viscosity, and is corrosion-resistant and dirt-resistant;

[0036] 4. It is conducive to the flow of fluid and facilitates the inflow and outflow of fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0038] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the present application.

[0039] Among them, 1. non-variable inner diameter measuring tube; 2. first variable inner diameter measuring tube; 3. second variable inner diameter measuring tube; 4. variable inner diameter throttling piece; 5. sensor body flange; 6. positive pressure nozzle; 7. negative pressure nozzle;

[0040] The inner diameter of the fixed inner diameter measuring tube is D, the inner diameter of the first variable inner diameter measuring tube is D1, the inner diameter of the second variable inner diameter measuring tube is D2, and the inner diameter of the variable inner diameter throttling element is d;

[0041] The arrows indicate the flow direction of the fluid to be measured. DETAILED DESCRIPTION

[0042] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] For the convenience of description, the words "D", "D1", "D2", "d", "P1" and "P2" appearing in the present invention do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention.

[0045] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0046] Embodiment 1

[0047] As introduced in the background technology, traditional flow measurement sensors cannot measure high temperature (temperature greater than 550°C), high pressure (above 10Mpa), high flow velocity impact, or low flow velocity (liquid flow rate below 0.5 m / s, gas flow rate below 3 m / s) and high viscosity fluid media. There are also problems such as limited caliber adaptability and unstable performance of flow measurement devices.

[0048] Therefore, this embodiment provides a step-by-step flow measurement sensor, which includes a sensor body flange 5, a fixed inner diameter measuring tube 1, a first variable inner diameter measuring tube 2, a variable inner diameter throttling piece 4, and a second variable inner diameter measuring tube 3; the number of fixed inner diameter measuring tubes 1 is 2;

[0049] The fixed inner diameter measuring tube 1, the first variable inner diameter measuring tube 2, the variable inner diameter throttling device 4 and the second variable inner diameter measuring tube 3 are connected in sequence in the order of the fixed inner diameter measuring tube 1, the first variable inner diameter measuring tube 2, the variable inner diameter throttling device 4, the second variable inner diameter measuring tube 3 and the fixed inner diameter measuring tube 1, that is, one end of the first fixed inner diameter measuring tube 1 is connected with one end of the first variable inner diameter measuring tube 2, the other end of the first variable inner diameter measuring tube 2 is connected with one end of the variable inner diameter throttling device 4, the other end of the variable inner diameter throttling device 4 is connected with one end of the second variable inner diameter measuring tube 3, and the other end of the second variable inner diameter measuring tube 3 is connected with another fixed inner diameter measuring tube 1, and the fixed inner diameter measuring tube 1, the first variable inner diameter measuring tube 2, the variable inner diameter throttling device 4 and the second variable inner diameter measuring tube 3 are installed inside the sensor body flange 5 and fit tightly with the sensor body flange 5.

[0050] The first variable inner diameter measuring tube 2 is provided with a positive pressure taking hole, which passes through the sensor body flange 5; the positive pressure taking nozzle 6 is installed on the sensor body flange 5 through the positive pressure taking hole; the second variable inner diameter measuring tube 3 is provided with a negative pressure taking hole, which passes through the sensor body flange 5; the negative pressure taking nozzle 7 is installed on the sensor body flange 5 through the negative pressure taking hole.

[0051] The inner diameter of the fixed inner diameter measuring tube 1 is larger than the inner diameter of the first variable inner diameter measuring tube 2, and the inner diameter of the first variable inner diameter measuring tube 2 is larger than the inner diameter of the second variable inner diameter measuring tube 3. The inner diameter of the variable inner diameter throttling device 4 is smaller than the inner diameter of the first variable inner diameter measuring tube 2, and the inner diameter of the variable inner diameter throttling device 4 is smaller than the inner diameter of the second variable inner diameter measuring tube 3. The outer diameter of the variable inner diameter throttling device 4 is larger than the inner diameter of the second variable inner diameter measuring tube 3 and equal to the inner diameter of the first variable inner diameter measuring tube 2.

[0052] One end of the first variable inner diameter measuring tube 2 connected to the non-inner diameter measuring tube is set to a cone along the flow direction, and one end of the second variable inner diameter measuring tube 3 connected to the non-inner diameter measuring tube is set to a cone in the opposite direction of the flow direction.

[0053] like Figure 1 As shown, for the convenience of description, the inner diameter of the fixed inner diameter measuring tube 1 is D, the inner diameter of the first variable inner diameter measuring tube 2 is D1, the inner diameter of the second variable inner diameter measuring tube 3 is D2, and the inner diameter of the variable inner diameter throttling member 4 is d. According to the actual measurement medium performance, working temperature, working pressure, flow range and other specific flow parameters, D1, D2 and d values ​​can be dynamically selected to accurately measure the flow. After the step-by-step flow measurement sensor mentioned in this embodiment is manufactured, all dimensions remain fixed.

[0054] Since D > D1 > D2, when the fluid to be measured passes through the non-variable inner diameter measuring tube 1, the first variable inner diameter measuring tube 2, and the second variable inner diameter measuring tube 3 in sequence, the local flow velocity of the fluid increases. Pressure is taken at P1 and P2 before and after the variable inner diameter throttle element 4. P1 > P2, and the differential pressure signal = P1 - P2. The physical signal generated in this way is strong, and the measurement accuracy is high, which can meet the measurement of media with small flow rates, low flow velocities, and high viscosities. The "step" of the step-type flow measurement sensor refers to the measured medium flowing through the non-variable inner diameter measuring tube 1 (inner diameter D), the first variable inner diameter measuring tube 2 (inner diameter D1), the variable inner diameter throttle element 4 (inner diameter d), and the second variable inner diameter measuring tube 3 (inner diameter D2) in sequence. Since D > D1 > D2, the measured medium is step-by-step accelerated layer by layer, changing the local flow field velocity.

[0055] Since D1 > D2 and d < D1, d < D2, the outer diameter of the variable inner diameter throttle element 4 is greater than the inner diameter of the second variable inner diameter measuring tube 3 and equal to the inner diameter of the first variable inner diameter measuring tube 2. When the fluid flows in along the Figure 1 indicated flow direction, the second variable inner diameter measuring tube 3 provides support for the variable inner diameter throttle element 4, and the first variable inner diameter measuring tube 2 and the second variable inner diameter measuring tube 3 clamp the variable inner diameter throttle element 4 to prevent the variable inner diameter throttle element 4 from falling off. The variable inner diameter throttle element 4 has stable mechanical properties under high temperature, high pressure, and high flow velocity impacts, cannot fall off, causing safety production accidents, has high precision, and a range ratio of more than 1:20.

[0056] Since the fluids measured by the step-type flow measurement sensor have diverse materials, in this embodiment, the non-variable inner diameter measuring tube 1, the first non-variable inner diameter measuring tube 1, and the second non-variable inner diameter measuring tube 1 are all made of metal, can withstand an internal medium temperature of up to 850 °C at most, can withstand a pressure of up to 42 Mpa at most, can withstand high-viscosity media, and are corrosion-resistant and dirt-resistant.

[0057] The step-type flow measurement sensor of the present invention can measure the flow rate of the medium in the process pipeline within the range of DN10 - DN2000 pipe diameters, with an accuracy of 1.0. The range ratio of the step-type flow measurement sensor is more than 20:1, the repeatability is 0.1%, and the range of the flow-through area ratio β of the step-type flow measurement sensor inside the measurement pipeline is 0.1 - 0.9.

[0058] Embodiment 2

[0059] The difference between this embodiment and Embodiment 1 is that the outer diameter of the variable inner diameter throttle element 4 is greater than the inner diameter of the second variable inner diameter measuring tube 3, and the outer diameter of the variable inner diameter throttle element 4 is greater than the inner diameter of the first variable inner diameter measuring tube 2.

[0060] The variable inner diameter throttling device 4 is firmly clamped by the first inner diameter measuring tube and the second inner diameter measuring tube. The step-by-step flow measurement sensor can be used to measure the flow rate of a bidirectional flow medium. No matter how the flow direction changes, it will not affect the firmness, stability, reliability and wide adaptability of the variable inner diameter throttling device 4.

[0061] Embodiment 3

[0062] This embodiment discloses a flow measurement method using a step-by-step flow measurement sensor, comprising:

[0063] S1. Connect the step-by-step flow measurement sensor to the connecting flange of the process pipeline of the flow to be measured through the sensor body flange 5; wherein the diameter of the fixed inner diameter measuring tube 1 is the same as the diameter of the process pipeline of the flow to be measured; the fixed inner diameter measuring tube 1 is coaxially connected to the process pipeline of the flow to be measured; the straight pipe section length of the process pipeline of the flow to be measured in front of the step-by-step flow measurement sensor is at least 2 times the diameter of the process pipeline of the flow to be measured, and the straight pipe section length of the process pipeline of the flow to be measured behind the step-by-step flow measurement sensor is at least 1 times the diameter of the process pipeline to be measured.

[0064] S2, the fluid to be measured passes through the fixed inner diameter measuring tube 1, the first variable inner diameter measuring tube 2 and the second variable inner diameter measuring tube 3 in sequence, and the pressure signals P1 and P2 are taken in sequence before and after the variable inner diameter throttling element 4 along the direction of the fluid flow, and the differential pressure is calculated;

[0065] S3. Calculate flow based on differential pressure, known fluid conditions, step-by-step flow measurement sensor, and process piping geometry.

[0066] Embodiment 4

[0067] This embodiment discloses a flow measurement system, including the above-mentioned step-type flow measurement sensor. Since the above-mentioned step-type flow measurement sensor has the above-mentioned technical effects, the technical effects of the flow measurement system using the step-type flow measurement sensor can refer to the above-mentioned embodiment.

[0068] The description of each embodiment in the above embodiments has different emphases. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0069] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A step-by-step flow measurement sensor, characterized in that: It includes a sensor body flange, a fixed inner diameter measuring tube, a first variable inner diameter measuring tube, a variable inner diameter throttling piece, and a second variable inner diameter measuring tube; the number of the fixed inner diameter measuring tubes is 2; The fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling piece and the second variable inner diameter measuring tube are connected in sequence in the order of the fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling piece, the second variable inner diameter measuring tube and the fixed inner diameter measuring tube, and are arranged inside the sensor body flange; The sensor body flange is provided with a positive pressure nozzle, and the positive pressure nozzle is communicated with the first variable inner diameter measuring tube; The sensor body flange is provided with a negative pressure nozzle, and the negative pressure nozzle is communicated with the second variable inner diameter measuring tube; The inner diameter of the fixed inner diameter measuring tube is larger than the inner diameter of the first variable inner diameter measuring tube, and the inner diameter of the first variable inner diameter measuring tube is larger than the inner diameter of the second variable inner diameter measuring tube; The inner diameter of the variable inner diameter throttling element is smaller than the inner diameter of the first variable inner diameter measuring tube, and the inner diameter of the variable inner diameter throttling element is smaller than the inner diameter of the second variable inner diameter measuring tube.

2. The step-by-step flow measurement sensor according to claim 1, characterized in that: The first variable inner diameter measuring tube is provided with a positive pressure taking hole, and the positive pressure taking hole penetrates the sensor body flange; the positive pressure taking nozzle is arranged on the sensor body flange through the positive pressure taking hole; The second variable inner diameter measuring tube is provided with a negative pressure taking hole, and the negative pressure taking hole penetrates the sensor body flange; the negative pressure taking nozzle is arranged on the sensor body flange through the negative pressure taking hole.

3. The step-by-step flow measurement sensor according to claim 1, characterized in that: One end of the first variable inner diameter measuring tube communicating with the fixed inner diameter measuring tube is configured to be conical along the flow direction; One end of the second variable inner diameter measuring tube communicating with the fixed inner diameter measuring tube is configured to be tapered in the opposite direction of the flow direction.

4. The step-by-step flow measurement sensor according to claim 1, characterized in that: The fixed inner diameter measuring tube, the first variable inner diameter measuring tube and the second variable inner diameter measuring tube are all made of metal.

5. The step-by-step flow measurement sensor according to claim 1, characterized in that: The outer diameter of the variable inner diameter throttling element is greater than the inner diameter of the second variable inner diameter measuring tube.

6. A flow measurement method using the step-type flow measurement sensor according to any one of claims 1 to 5, characterized in that: S1. Connect the step-by-step flow measurement sensor to the connection flange of the process pipeline of the flow to be measured through the sensor body flange; S2, the fluid to be measured passes through the fixed inner diameter measuring tube, the first variable inner diameter measuring tube, the variable inner diameter throttling element and the second variable inner diameter measuring tube in sequence, and the pressure signals P1 and P2 are taken in sequence before and after the variable inner diameter throttling element along the direction of the fluid flow, and the differential pressure is calculated; S3. Calculate flow based on differential pressure, known fluid conditions, step-by-step flow measurement sensor, and process piping geometry.

7. The flow measurement method according to claim 6, characterized in that: The diameter of the fixed inner diameter measuring tube is the same as the diameter of the process pipeline of the flow to be measured; The fixed inner diameter measuring tube is coaxially connected to the process pipeline of the flow to be measured.

8. A flow measurement system, characterized in that: A step-by-step flow measurement sensor comprising any one of claims 1-5.

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