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

Abstract

The utility model 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 utility model 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 application relates to the technical field of low-temperature fluid flow measurement experiment devices, in particular to a low-temperature tapered inner-outer tube differential pressure flow measurement device. BACKGROUND

[0002] At present, the inner-outer tube differential pressure flowmeter is more conducive to accurate measurement of fluid flow because it does not change the total flow area of the fluid when measuring the flow, has less influence on the fluid flow pattern, reduces the disturbance to the fluid measurement, and obtains the differential pressure in the same cross section, eliminating the influence of the pressure drop before and after throttling on the differential pressure signal.

[0003] Compared with normal temperature fluid, low-temperature fluid has lower density, and its differential pressure is lower than that of conventional fluid under the same volumetric flow, so the accuracy requirement of the differential pressure sensor is higher. By changing the structure of the inner-outer tube differential pressure flowmeter to increase the inner-outer pressure difference, the inner tube diameter needs to be further reduced, the flow difference between the inner and outer tubes is increased, and thus the inner-outer pressure difference is increased. However, under the condition that the inner-outer tube differential pressure flowmeter gradually expands at a certain angle, reducing the diameter of the inner tube will greatly increase the overall length of the inner-outer tube differential pressure flowmeter, and if the expansion angle is increased or even directly changed, the fluid flow will be disturbed, resulting in vortex or even backflow, thereby causing inaccurate flow measurement.

[0004] Therefore, in view of the above problems, we propose a new low-temperature inner-outer tube differential pressure flow measurement device and system suitable for measuring low-temperature fluid flow, to avoid excessive increase in the length of the inner-outer tube differential pressure flowmeter. SUMMARY

[0005] In view of the above deficiencies in the prior art, the present application aims to provide a low-temperature tapered inner-outer tube differential pressure flow measurement device and system to solve the problem that the low-temperature fluid has lower density, and its differential pressure is lower than that of conventional fluid under the same volumetric flow, so the accuracy requirement of the differential pressure sensor is higher.

[0006] The technical scheme adopted by the present application to achieve the above-mentioned purpose is: a low-temperature tapered inner-outer tube differential pressure flow measuring device, comprising tapered pipes, inner-outer tube differential pressure flow meter pipes, inner-outer tube differential pressure flow meters and pressure lead pipes, characterized in that: both ends of the inner-outer tube differential pressure flow meter pipes along the 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 inner-outer tube differential pressure flow meter pipes as the reference; the middle position of the inner-outer tube differential pressure flow meter pipes along the length direction is connected with an inner-outer tube differential pressure flow meter; the middle position of the inner-outer tube differential pressure flow meter pipes along the length direction is also connected with two pressure lead pipes, and the two pressure lead pipes are symmetrically arranged up and down with the horizontal central axis of the inner-outer tube differential pressure flow meter pipes as the reference.

[0007] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring device, the present application adopts the scheme that: the outer side end of the two tapered pipes is connected with a sealing flange through welding, and a gasket is added between the two sealing flanges, and the gasket is one of a metal gasket, a graphite gasket and a rubber gasket.

[0008] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring device, the present application adopts the scheme that: the sealing flange on the inner side of the inner-outer tube differential pressure flow meter pipe is outwardly convex, and the sealing flange on the outer side of the inner-outer tube differential pressure flow meter pipe is inwardly concave and insertable.

[0009] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring device, the present application adopts the scheme that: a sealing gasket is arranged between the tapered pipe and the inner-outer tube differential pressure flow meter pipe.

[0010] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring device, the present application adopts the scheme that: the sealing gasket is a polytetrafluoroethylene low-temperature sealing gasket.

[0011] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring device, the present application adopts the scheme that: the two pressure lead pipes are horizontally placed relative to the inner-outer tube differential pressure flow meter pipe.

[0012] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring device, the present application adopts the scheme that: one side of the pressure lead pipe is connected to the inner-outer tube differential pressure flow meter pipe, and the other side of the pressure lead pipe is connected to the inner-outer tube differential pressure flow meter.

[0013] The application further provides a low-temperature tapered inner-outer tube differential pressure flow measuring system.

[0014] In order to further improve the use convenience of the low-temperature tapered inner-outer tube differential pressure flow measuring system, the application adopts the following scheme: the data input module comprises a flow metering unit, a transceiving switching unit and a data processing unit, a data input signal is sequentially passed through the flow metering unit, the transceiving switching unit and the data processing unit after being accepted; the data input signal is converted into a data filtering signal through data filtering processing; the data input module comprises a flow saving unit, a logic control unit and a data proofreading unit, and the data filtering signal is sequentially converted into a data output signal through the flow saving unit, the logic control unit and the data proofreading unit.

[0015] The application has the following beneficial effects:

[0016] (1) The application is provided with a tapered pipe, which increases the fluid flow rate by reducing the fluid flow area, thereby increasing the inner-outer tube differential pressure and the differential pressure measured by the flow meter, and reducing the precision requirement of the differential pressure sensor.

[0017] (2) The application does not need to redesign the structural parameters of the inner-outer tube differential pressure flow meter, effectively saves manpower and material resources, and has a lower requirement for the installation length, and is suitable for various flow measurement conditions.

[0018] (3) The application is connected through welding and sealing flanges, which improves the disassembly and assembly efficiency while ensuring the sealing property, and is helpful for actual engineering construction.

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

[0020] In addition, the measuring system provided by the application is used in cooperation with the measuring device, and through efficient data signal capture, filtering and analysis processing, the accuracy of measuring the flow of low-temperature fluid is effectively improved. DETAILED DESCRIPTION

[0021] Figure 1 is a perspective structural schematic view of the application;

[0022] Figure 2 is a front view structural schematic view of the application;

[0023] Figure 3 is a structural schematic view of the application in A-A direction;

[0024] Figure 4 is a side view structural schematic view of the application;

[0025] Figure 5 Installation diagram of the pressure lead pipe of the present application;

[0026] Figure 6 System framework diagram of the whole system of the present application;

[0027] Figure 7 Waveform diagram of the data signal of the present application;

[0028] Figure 8 System framework diagram of the data input and output part of the present application;

[0029] Figure 9 System framework diagram of the data input module of the present application;

[0030] Figure 10 System framework diagram of the data output module of the present application.

[0031] In the figure: 1 sealing flange, 2 tapered pipe, 3 sealing gasket, 4 inner and outer differential pressure flowmeter pipe, 5 inner and outer pipe differential pressure flowmeter, 6 pressure lead pipe. DETAILED DESCRIPTION

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

[0033] Please refer to Figures 1 to 5The low-temperature tapered inner-outer tube differential pressure flow measuring device of the embodiment comprises a tapered pipe 2, an inner-outer differential pressure flowmeter pipe 4, an inner-outer tube differential pressure flowmeter 5 and a pressure lead pipe 6, wherein: the tapered pipe 2 is connected to both ends of the inner-outer differential pressure flowmeter pipe 4 along the length direction of the inner-outer differential pressure flowmeter pipe 4, and the two tapered pipes 2 are symmetrically arranged left and right with the vertical central axis of the inner-outer differential pressure flowmeter pipe 4 as the reference; the inner-outer tube differential pressure flowmeter 5 is connected to the middle position of the inner-outer differential pressure flowmeter pipe 4 along the length direction of the inner-outer differential pressure flowmeter pipe 4, and the inner-outer tube differential pressure flowmeter 5 has little influence on the fluid flow pattern because it does not change the total flow area of the fluid during flow measurement, reduces the disturbance to the fluid measurement, and obtains the differential pressure in the same cross section, eliminating the influence of the resistance pressure drop before and after throttling on the differential pressure signal, which is more conducive to accurate measurement of fluid flow; the two pressure lead pipes 6 are connected to the middle position of the inner-outer differential pressure flowmeter pipe 4 along the length direction of the inner-outer differential pressure flowmeter pipe 4, and the two pressure lead pipes 6 are symmetrically arranged up and down with the horizontal central axis of the inner-outer differential pressure flowmeter pipe 4 as the reference; during use, the pressure lead pipe 6 is connected to the differential pressure sensor (such as a Honeywell PX2 sensor) outside through the light pipe, the sleeve and the adapter, the differential pressure sensor is placed on the test bench, the fluid is accelerated through the tapered pipe 2, the pressure difference of the inner-outer tube differential pressure flowmeter pipe 4 is increased, the pressure difference of the inner-outer tube differential pressure flowmeter pipe 4 is obtained through the inner-outer tube differential pressure flowmeter 5, and the pressure signal is introduced into the differential pressure sensor through the pressure lead pipe 6, so that the fluid flow is calculated.

[0034] In the present application: the outer side end of the two tapered pipes 2 is connected with a sealing flange 1 through welding, a gasket is added between the two sealing flanges 1, the gasket is one of a metal gasket, a graphite gasket and a rubber gasket, and the installation sealing effect of the tapered pipe 2 is improved.

[0035] Further, the sealing flange 1 on the inner side of the inner-outer differential pressure flowmeter pipe 4 is outwardly convex, and the sealing flange 1 on the outer side of the inner-outer differential pressure flowmeter pipe 4 is inwardly concave and insertable, so as to ensure the sealing property and the convenience of installation and disassembly.

[0036] Further, the sealing gasket 3 is arranged between the tapered pipe 2 and the inner-outer differential pressure flowmeter pipe 4, the sealing gasket 3 is a polytetrafluoroethylene low-temperature sealing gasket, has excellent low-temperature resistance, can maintain its elasticity and sealing property at extremely low temperature, can stably work in a high-voltage environment, meets the environmental protection requirements, does not pollute the environment, and does not harm human health.

[0037] Further, the two said pressure pipes 6 are horizontally placed relative to the inner-outer differential pressure flowmeter pipe 4, eliminating the pressure change caused by gravity potential, improving the measurement accuracy of the flowmeter, one side of the said pressure pipe 6 is connected to the inner-outer differential pressure flowmeter pipe 4, and the other side of the said pressure pipe 6 is connected to the inner-outer pipe differential pressure flowmeter 5, so as to measure the pressure difference.

[0038] Please refer to Figures 6 to 10 The low-temperature tapered inner-outer pipe differential pressure flow measurement system of the embodiment 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 the low-temperature tapered inner-outer pipe differential pressure flow measurement device.

[0039] Specifically, the data input module comprises a flow measurement unit, a transceiving switching unit and a data processing unit, after a data input signal is accepted, it is sequentially passed through the flow measurement unit, the transceiving switching unit and the data processing unit; a data input signal is converted into a data filtering signal through data filtering processing, and responds to the received signal in time, so as to timely exclude interference signals, and filter the noise and other factors to further improve the filtering accuracy; the data input module comprises a flow saving unit, a logic control unit and a data correction unit, and the data filtering signal is sequentially converted into a data output signal through the flow saving unit, the logic control unit and the data correction unit.

[0040] The application is suitable for flow measurement of low-temperature fluids such as liquid nitrogen and liquid oxygen, uses a tapered pipe to accelerate the fluid, thereby increasing the pressure difference between the inner pipe and the outer pipe, and realizes the measurement of the flow of low-temperature fluids. The application also solves the problems of too small pressure difference when the inner-outer differential pressure flowmeter measures the flow of low-temperature fluids, the need to redesign the inner-outer pipe differential pressure flowmeter and the too large installation length of the inner-outer pipe differential pressure flowmeter.

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

[0042] The standard parts used in the application can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the mechanical parts and equipment adopt conventional types in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here, and the contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0043] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A low temperature tapered inner-outer tube differential pressure flow measuring device, comprising two tapered tubes (2), an inner-outer differential pressure flowmeter pipe (4), an inner-outer tube differential pressure flowmeter (5) and two pressure lead pipes (6), characterized in that: Both ends of the inner-outer differential pressure flowmeter pipeline (4) are detachably connected with tapered pipes (2) along the length direction thereof; the two tapered pipes (2) are symmetrically arranged left and right with the middle axis of the inner-outer differential pressure flowmeter pipeline (4) in the up-down direction as the reference; the inner-outer differential pressure flowmeter pipeline (4) is connected with an inner-outer tube differential pressure flowmeter (5) at the middle position along the length direction thereof; the inner-outer differential pressure flowmeter pipeline (4) is further connected with two pressure lead pipes (6) at the middle position along the length direction thereof, and the two pressure lead pipes (6) are symmetrically arranged up and down with the horizontal middle axis of the inner-outer differential pressure flowmeter pipeline (4) as the reference.

2. A cryogenic tapered inner and outer tube differential pressure flow measuring device according to claim 1, wherein: The outer side end of the two tapered pipes (2) is connected with a sealing flange (1) through welding.

3. A cryogenic reducing inner and outer tube differential pressure flow measuring device according to claim 2, wherein: The sealing flanges (1) arranged in pairs are both added with a gasket, which is one of a metal gasket, a graphite gasket and a rubber gasket.

4. A cryogenic reducing inner and outer tube differential pressure flow measuring device according to claim 2, wherein: The sealing flange (1) arranged inside the inner-outer differential pressure flowmeter pipeline (4) is outwardly convex, and the sealing flange (1) arranged outside the inner-outer differential pressure flowmeter pipeline (4) is inwardly concave and insertable.

5. A cryogenic tapered inner and outer tube differential pressure flow measuring device according to claim 1, wherein: The sealing gasket (3) is arranged between the tapered pipe (2) and the inner-outer differential pressure flowmeter pipeline (4).

6. A cryogenic reducing inner and outer tube differential pressure flow measuring device according to claim 5, wherein: The sealing gasket (3) is a polytetrafluoroethylene low-temperature sealing gasket.

7. A cryogenic tapered inner and outer tube differential pressure flow measuring device according to claim 1, wherein: The positions of the two pressure lead pipes (6) relative to the inner-outer differential pressure flowmeter pipeline (4) are horizontally arranged.

8. A cryogenic reducing inner and outer tube differential pressure flow measuring device according to claim 7, wherein: One side of the pressure lead pipe (6) is connected with the inner-outer differential pressure flowmeter pipeline (4), and the other side of the pressure lead pipe (6) is connected with the inner-outer tube differential pressure flowmeter (5).

9. A cryogenic tapered inner and outer tube differential pressure flow measurement system characterized by: The low-temperature tapered inner-outer tube differential pressure flow measurement device comprises 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 low-temperature tapered inner-outer tube differential pressure flow measurement device according to any one of claims 1-8.

10. A cryogenic reducing inner and outer tube differential pressure flow measurement system as claimed in claim 9, wherein: The data input module comprises a flow metering unit, a transceiving switching unit and a data processing unit, and a data input signal is sequentially passed through the flow metering unit, the transceiving switching unit and the data processing unit after being received; the data input signal is converted into a data filtering signal through data filtering processing; the data input module comprises a flow saving unit, a logic control unit and a data proofreading unit, and the data filtering signal is sequentially converted into a data output signal through the flow saving unit, the logic control unit and the data proofreading unit.

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