Low-temperature gradually-shrinking type inner and outer pipe differential pressure flow measuring device and system thereof

Abstract

The invention discloses a low-temperature reducing type inner and outer pipe differential pressure flow measuring device which is characterized in that reducing pipes are connected to the two ends of an inner and outer differential pressure flow meter pipeline in the length direction of the inner and outer differential pressure flow meter pipeline, and an inner and outer pipe differential pressure flow meter is connected to the middle position of the inner and outer differential pressure flow meter pipeline in the length direction of the inner and outer differential pressure flow meter pipeline; two pressure guiding pipes are further connected to the middle position of the internal and external differential pressure flowmeter pipeline in the length direction of the internal and external differential pressure flowmeter pipeline, and the two pressure guiding pipes are horizontally arranged on the internal and external pipe differential pressure flowmeter. The invention further provides a low-temperature reducing type inner and outer pipe differential pressure flow measuring system which is used for assisting rapid datamation processing of flow. On the basis that structural parameters of the inner and outer pipe differential pressure flowmeter are not changed, the reducing pipe is used for reducing the flow area of fluid, so that the flow speed of the fluid is increased, the pressure difference measured by the inner and outer pipe differential pressure flowmeter is increased, the requirement for the precision of a differential pressure sensor is reduced, meanwhile, the requirement for the overall installation length of the flowmeter is reduced, and the cost is reduced. The method is suitable for actual measurement engineering operation.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature fluid flow measurement experimental devices, and specifically relates to a low-temperature tapered inner and outer pipe differential pressure flow measurement device. Background Art

[0002] At present, for inner and outer pipe differential pressure flowmeters, since they do not change the total flow area of the fluid when measuring the flow rate, they have less influence on the fluid flow pattern, reduce the disturbance to the fluid measurement, and obtain the pressure difference at the same cross-section, eliminating the influence of the frictional pressure drop before and after throttling on the differential pressure signal, which is more conducive to the accurate measurement of fluid flow rate. In the prior art, although Li Xiaoting, Wang Xiaojie, Fang Lide and their research group at North University of China have conducted a large number of studies on the structure and parameters of inner and outer differential pressure flowmeters, the main fluids they studied are normal-temperature fluids such as water, oil, and gas, and there is less research on low-temperature fluids.

[0003] Compared with normal-temperature fluids, due to their lower density, low-temperature fluids have a lower pressure difference than conventional fluids under the same volume flow rate, so higher precision requirements are imposed on the differential pressure sensor. To increase the inner and outer pressure difference by changing the structure of the inner and outer pipe differential pressure flowmeter, it is necessary to further reduce the inner pipe diameter and increase the difference in fluid flow rate between the inner and outer pipes, thereby increasing the inner and outer pressure difference; however, when the expansion angle of the inner flow channel in the inner and outer pipe differential pressure flowmeter is fixed, reducing the inner pipe diameter will greatly increase the overall length of the inner and outer pipe differential pressure flowmeter. If the expansion angle is increased or even directly changed in diameter, it will disrupt the fluid flow, resulting in eddy currents and even backflows, thus making the flow measurement inaccurate.

[0004] Therefore, in view of the above problems, we propose a novel low-temperature inner and outer pipe differential pressure flow measurement device and system suitable for measuring the flow rate of low-temperature fluids to avoid excessive increase in the length of the inner and outer pipe differential pressure flowmeter. Summary of the Invention

[0005] Aiming at the above deficiencies existing in the prior art, the purpose of the present invention is to provide a low-temperature tapered inner and outer pipe differential pressure flow measurement device and system, which are used to solve the problem that for existing low-temperature fluids, due to their lower density, under the same volume flow rate, their pressure difference is lower than that of conventional fluids, so higher precision requirements are imposed on the differential pressure sensor.

[0006] The technical solution adopted by the present invention to achieve the above object is as follows: A low-temperature tapered internal and external pipe differential pressure flow measurement device, including a tapered pipe, an internal and external differential pressure flowmeter pipeline, an internal and external pipe differential pressure flowmeter, and a pressure guiding pipe, is characterized in that: Both ends of the internal and external differential pressure flowmeter pipeline along its length direction are connected with tapered pipes, and the two tapered pipes are symmetrically arranged left and right with the vertical central axis of the internal and external differential pressure flowmeter pipeline as the reference; The middle position of the internal and external differential pressure flowmeter pipeline along its length direction is connected with an internal and external pipe differential pressure flowmeter; The middle position of the internal and external differential pressure flowmeter pipeline along its length direction is also connected with two pressure guiding pipes, both of the two pressure guiding pipes are arranged on the internal and external pipe differential pressure flowmeter, and the two pressure guiding pipes are symmetrically arranged up and down with the horizontal central axis of the internal and external differential pressure flowmeter pipeline as the reference.

[0007] In order to further improve the usability of the low-temperature tapered internal and external pipe differential pressure flow measurement device, the solution adopted by the present invention is: Sealing flanges are welded to the outer sides of the two tapered pipes, and gaskets are added between the two sealing flanges.

[0008] In order to further improve the usability of the low-temperature tapered internal and external pipe differential pressure flow measurement device, the solution adopted by the present invention is: The sealing flange on the inner side relative to the internal and external differential pressure flowmeter pipeline is an outwardly protruding sealing flange, and the sealing flange on the outer side relative to the internal and external differential pressure flowmeter pipeline is an inwardly recessed and insertable sealing flange.

[0009] In order to further improve the usability of the low-temperature tapered internal and external pipe differential pressure flow measurement device, the solution adopted by the present invention is: Sealing washers are provided between the tapered pipes and the internal and external differential pressure flowmeter pipeline.

[0010] In order to further improve the usability of the low-temperature tapered internal and external pipe differential pressure flow measurement device, the solution adopted by the present invention is: The gasket is a polytetrafluoroethylene low-temperature sealing washer.

[0011] In order to further improve the usability of the low-temperature tapered internal and external pipe differential pressure flow measurement device, the solution adopted by the present invention is: The two pressure guiding pipes are horizontally placed relative to the internal and external differential pressure flowmeter pipeline.

[0012] In order to further improve the usability of the low-temperature tapered internal and external pipe differential pressure flow measurement device, the solution adopted by the present invention is: One side of the pressure guiding pipe is connected to the internal and external differential pressure flowmeter pipeline, and the other end of the pressure guiding pipe is connected to the internal and external pipe differential pressure flowmeter on one side.

[0013] The present invention also provides a low-temperature tapered internal and external pipe differential pressure flow measurement system, which is characterized in that: It includes a data input module, a data collection and storage module, a data processing and analysis module, a data display and control module, a data output module, and the above-mentioned low-temperature tapered internal and external pipe differential pressure flow measurement device.

[0014] In order to further improve the usability of the low-temperature tapered inner and outer pipe differential pressure flow measurement system, the solution adopted in the present invention is as follows: The data input module includes a flow measurement unit, a transceiver switching unit, and a data processing unit. After a data input signal is received, it sequentially passes through the flow measurement unit, the transceiver switching unit, and the data processing unit; a data input signal is converted into a data filtering signal through data filtering processing; the data output unit includes a flow storage unit, a logic control unit, and a data verification unit, and the data filtering signal is converted into a data output signal by sequentially passing through the flow storage unit, the logic control unit, and the data verification unit.

[0015] Advantages of the present invention:

[0016] (1) The present invention is provided with a tapered pipe. By reducing the fluid flow area, the fluid velocity is increased, thereby increasing the differential pressure between the inner and outer pipes, further increasing the differential pressure measured by the flowmeter, and reducing the accuracy requirement for the differential pressure sensor.

[0017] (2) The present invention does not need to redesign the structural parameters of the inner and outer pipe differential pressure flowmeter, effectively saving manpower and material resources, and having a low requirement for the installation length, being applicable to various flow measurement situations.

[0018] (3) The present invention is connected by welding and sealing flanges, improving the disassembly and assembly efficiency while ensuring the sealing performance, which is helpful for actual engineering construction.

[0019] (4) The present invention is provided with a horizontally placed pressure guiding pipe, which can reduce the influence brought by the gravitational potential energy and further improve the accuracy of flow measurement.

[0020] In addition, the measurement system provided by the present invention can be used in cooperation with a measurement device, and effectively improves the accuracy of measuring the flow rate of low-temperature fluids through efficient data signal capture, filtering, and analysis and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a front view structural schematic diagram of the present invention;

[0023] Figure 3 is a structural schematic diagram of the present invention in the A-A direction;

[0024] Figure 4 is a side view structural schematic diagram of the present invention;

[0025] Figure 5 is an installation schematic diagram of the pressure guiding pipe of the present invention;

[0026] Figure 6 is a system framework diagram of the whole of the present invention;

[0027] Figure 7 is the waveform diagram of the data signal of the present invention;

[0028] Figure 8 is the system framework diagram of the data input and output part of the present invention;

[0029] Figure 9 is the system framework diagram of the data input module of the present invention;

[0030] Figure 10 is the system framework diagram of the data output module of the present invention.

[0031] In the figure: 1 sealing flange, 2 reducing pipe, 3 sealing gasket, 4 pipeline of internal and external differential pressure flowmeter, 5 internal and external pipe differential pressure flowmeter, 6 pressure guiding pipe. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] Please refer to Figures 1 to 5, A low-temperature tapered inner and outer pipe differential pressure flow measurement device according to this embodiment includes a tapered pipe 2, an inner and outer differential pressure flowmeter pipeline 4, an inner and outer pipe differential pressure flowmeter 5, and a pressure guiding pipe 6. Among them: Both ends of the inner and outer differential pressure flowmeter pipeline 4 along its length direction are connected with tapered pipes 2, and the two tapered pipes 2 are symmetrically arranged left and right with the vertical central axis of the inner and outer differential pressure flowmeter pipeline 4 as the reference; The middle position of the inner and outer differential pressure flowmeter pipeline 4 along its length direction is connected with an inner and outer pipe differential pressure flowmeter 5. Since the inner and outer pipe differential pressure flowmeter 5 does not change the total flow area of the fluid when measuring the flow rate, it has a small influence on the fluid flow pattern, reduces the disturbance to the fluid measurement, and obtains the differential pressure at the same cross-section, eliminating the influence of the frictional pressure drop before and after throttling on the differential pressure signal, which is more conducive to the accurate measurement of the fluid flow rate; The middle position of the inner and outer differential pressure flowmeter pipeline 4 along its length direction is also connected with two pressure guiding pipes 6. The two pressure guiding pipes 6 are both arranged on the inner and outer pipe differential pressure flowmeter 5, and the two pressure guiding pipes 6 are symmetrically arranged up and down with the horizontal central axis of the inner and outer differential pressure flowmeter pipeline 4 as the reference; During use, the pressure guiding pipe 6 is electrically connected to an external differential pressure sensor (for example: Honeywell PX2 sensor) through an optical tube, a ferrule, and a connector. The differential pressure sensor is placed on the experimental bench. The fluid is accelerated through the tapered pipe 2 to increase the differential pressure of the inner and outer differential pressure flowmeter pipeline 4 of the inner and outer pipes. The inner and outer pipe differential pressure flowmeter 5 is used to respectively obtain the differential pressure of the inner and outer differential pressure flowmeter pipeline 4, and the pressure signal is introduced into the differential pressure sensor through the pressure guiding pipe 6, thereby calculating the fluid flow rate.

[0034] In the present invention: Sealing flanges 1 are welded to the outer sides of the two tapered pipes 2, and gaskets are added between the two sealing flanges 1 to improve the installation sealing effect of the tapered pipe 2.

[0035] Furthermore, the sealing flange 1 on the inner side relative to the inner and outer differential pressure flowmeter pipeline 4 is convex outward, and the sealing flange 1 on the outer side relative to the inner and outer differential pressure flowmeter pipeline 4 is concave inward and insertable, ensuring the sealing performance and the convenience of installation and disassembly.

[0036] Furthermore, sealing washers 3 are provided between the tapered pipe 2 and the inner and outer differential pressure flowmeter pipeline 4. The sealing gasket 3 is a polytetrafluoroethylene low-temperature sealing gasket, which has excellent low-temperature resistance, can maintain its elasticity and sealing performance at extremely low temperatures, can also work stably in a high-voltage environment, and meets environmental protection requirements, will not pollute the environment, and will not harm human health.

[0037] Furthermore, the two pressure guiding pipes 6 are horizontally placed relative to the inside-outside differential pressure flowmeter pipeline 4 to eliminate the pressure change caused by gravitational potential energy and improve the measurement accuracy of the flowmeter. One side of the pressure guiding pipe 6 is connected to the inside-outside differential pressure flowmeter pipeline 4, and the other end of the pressure guiding pipe 6 is connected to the inside-outside pipe differential pressure flowmeter 5 to measure the differential pressure.

[0038] Please refer to Figures 6 to 10 , a low-temperature tapered inside-outside pipe differential pressure flow measurement system of this embodiment includes a data input module, a data collection and storage module, a data processing and analysis module, a data display and control module, a data output module, and the described low-temperature tapered inside-outside pipe differential pressure flow measurement device.

[0039] Specifically, the data input module includes a flow measurement unit, a transceiver switching unit, and a data processing unit. After a data input signal is received, it sequentially passes through the flow measurement unit, the transceiver switching unit, and the data processing unit; a data input signal is converted into a data filtering signal through data filtering processing, responds to the received signal in a timely manner to exclude interference signals in a timely manner, and performs sequential filtering on the filtering signal to further remove interference factors such as noise and improve the filtering accuracy; the data output unit includes a flow storage unit, a logic control unit, and a data verification unit, and the data filtering signal is sequentially converted into a data output signal through the flow storage unit, the logic control unit, and the data verification unit.

[0040] The present invention is applicable to the flow measurement of low-temperature fluids such as low-temperature liquid nitrogen and liquid oxygen. The tapered pipe is used to accelerate the fluid, thereby increasing the differential pressure between the inside and outside pipes and realizing the flow measurement of low-temperature fluids. This case also solves the problems of too small differential pressure when the inside-outside differential pressure flowmeter measures the flow of low-temperature fluids, the need to redesign the inside-outside pipe differential pressure flowmeter, and its too long installation length.

[0041] Moreover, the measurement system provided by the present invention can be used in cooperation with the measurement device. Through efficient data signal capture, filtering, and analysis and processing, the accuracy of measuring the flow of low-temperature fluids is effectively improved.

[0042] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art. Details are not described here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0043] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A low-temperature tapered inner and outer tube differential pressure flow measurement device, comprising two tapered tubes (2), an inner and outer differential pressure flow meter pipeline (4), an inner and outer tube differential pressure flow meter (5) and two pressure-introducing pipes (6), characterized in that: The inner and outer differential pressure flowmeter pipeline (4) is detachably connected to reducers (2) at both ends along its length direction; the two reducers (2) are symmetrically arranged with the vertical center axis of the inner and outer differential pressure flowmeter pipeline (4) as the reference line; the inner and outer differential pressure flowmeter pipeline (4) is connected to an inner and outer tube differential pressure flowmeter (5) at the middle part along its length direction; the inner and outer differential pressure flowmeter pipeline (4) is also connected to two pressure guide pipes (6) at the middle part along its length direction, and the two pressure guide pipes (6) are both arranged on the inner and outer tube differential pressure flowmeter (5), and the two pressure guide pipes (6) are symmetrically arranged with the horizontal center axis of the inner and outer differential pressure flowmeter pipeline (4) as the reference line.

2. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 1, characterized in that: The outer side ends of the two reducer pipes (2) are both connected to sealing flanges (1) by welding.

3. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 2, characterized in that: Gaskets are added between the sealing flanges (1) arranged in pairs, and the gaskets are one of metal gaskets, graphite gaskets and rubber gaskets.

4. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 2, characterized in that: The sealing flange (1) protruding outward is arranged on the inner side of the internal and external differential pressure flowmeter pipeline (4), and the sealing flange (1) recessed inward and insertable is arranged on the outer side of the internal and external differential pressure flowmeter pipeline (4).

5. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 1, characterized in that: A sealing gasket (3) is provided between the reducer (2) and the internal and external differential pressure flow meter pipeline (4).

6. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 5, characterized in that: The sealing gasket (3) is a polytetrafluoroethylene low-temperature sealing gasket.

7. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 1, characterized in that: The two pressure-guiding pipes (6) are arranged horizontally relative to the positions of the internal and external differential pressure flowmeter pipelines (4).

8. A low-temperature tapered inner and outer tube differential pressure flow measurement device according to claim 7, characterized in that: One side of the pressure-inducing pipe (6) is connected to the internal-external differential pressure flowmeter pipeline (4), and the other side of the pressure-inducing pipe (6) is connected to the internal-external differential pressure flowmeter (5).

9. A low temperature tapered inner and outer tube differential pressure flow measurement system, characterized in that: The device comprises a data input module, a data collection and storage module, a data processing and analysis module, a data display control module, a data output module and a low-temperature tapered inner-outer-tube differential pressure flow measurement device as claimed in any one of claims 1 to 8.

10. A low temperature tapered inner and outer tube differential pressure flow measurement system as claimed in claim 9, characterized in that: The data input module includes a flow metering unit, a transceiver switching unit and a data processing unit. After a data input signal is received, it passes through the flow metering unit, the transceiver switching unit and the data processing unit in sequence; a data input signal is converted into a data filtering signal through data filtering processing; the data output unit includes a flow storage unit, a logic control unit and a data proofreading unit. The data filtering signal is converted into a data output signal through the flow storage unit, the logic control unit and the data proofreading unit in sequence.

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