CN206269871U - A kind of Pitot tube integrated gas mass flowmenter - Google Patents

A kind of Pitot tube integrated gas mass flowmenter Download PDF

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Publication number
CN206269871U
CN206269871U CN201621142812.0U CN201621142812U CN206269871U CN 206269871 U CN206269871 U CN 206269871U CN 201621142812 U CN201621142812 U CN 201621142812U CN 206269871 U CN206269871 U CN 206269871U
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Prior art keywords
tube
pipe
connecting pipe
pressure transmitter
pitot tube
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CN201621142812.0U
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Inventor
陈怡�
李艳芝
李钦柯
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Sinopec Engineering Group Co Ltd
Sinopec Luoyang Guangzhou Engineering Co Ltd
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Sinopec Luoyang Petrochemical Engineering Corp
Sinopec Engineering Group Co Ltd
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Abstract

The utility model discloses a kind of Pitot tube integrated gas mass flowmenter, to overcome prior art accurately to measure the shortcoming of the mass flow of mixed multi-component gas in pipeline.The Pitot tube integrated gas mass flowmenter includes Pitot tube sensor, differential pressure transmitter, flow computer, vortex frequency sensor, drainage tube, pipe flange short tube, temperature transmitter and pressure transmitter, connecting pipe bottom is pressure head, connecting pipe sequentially passes through pipe flange short tube from bottom to top, flanged ball valve and drainage tube, drainage tube top and connecting pipe top are connected with differential pressure transmitter respectively, drainage tube top is also associated with temperature transmitter and pressure transmitter, temperature transmitter, the output end of pressure transmitter and differential pressure transmitter is connected by holding wire with the input of flow computer, vortex frequency sensor is connected by probe tube with pipe flange short tube.

Description

A kind of Pitot tube integrated gas mass flowmenter
Technical field
The utility model belongs to gaseous mass measuring apparatus, is related to a kind of Pitot tube integrated gas mass flowmenter.
Background technology
Pitot tube, English name Pitot tube are to determine gas velocity by measuring the stagnation pressure and static pressure of flowing gas A kind of tube of degree, is invented by French H. skins support and is gained the name.The construction of Pitot tube is bilayer sleeve, and its principle is to utilize head What portion center pitot hole was introduced flows static pressure flowing that baroport on stagnation pressure and overcoat tube wall introduces, and is converted through differential pressure transmitter The flow velocity or flow of fluid are converted into afterwards.Pitot tube is the technical foundation of pitot tube flowmeter.
Toll bar (Karman) vortex, is to set swirl generating body in a fluid, is alternately produced from swirl generating body both sides Regular vortex, the occurrence frequency of vortex is directly proportional to the fluid average speed for flowing through swirl generating body.Toll bar (Karman) Vortex theory is the technical foundation of vortex-shedding meter.In " theory analysis of toll bar vortex and application ", (Hou Haicun, Qinghai is pedagogical big Learn journal, 2005.3, P23-25) theory on toll bar vortex is analyzed in a text, toll bar vortical air flow gauge Operation principle is:Ultrasonic wave transmitting probe and receiving transducer are mounted opposite in Karman vortex generator downstream pipe both sides, because of card Door influence of the vortex to atmospheric density, time of the ultrasonic wave from transmitting probe to receiving transducer will be made more late than absence of vortices time-varying and Produce phase difference.This phase signal is processed, so that it may obtain vortex pulse signal, that is, the electric signal for representing volume flow is defeated Go out, mass flow is obtained final product multiplied by with density.
Pitot tube sensor is mainly included using the flowmeter of gas mass flow in Pitot tube principle measurement pipeline at present And differential pressure transmitter.
Chinese patent 201220403958.1 discloses a kind of plug-in type Pitot tube fluidic flowmeter.The fluidic flowmeter bag Pitot tube is included, the Pitot tube includes pipe and leeward pipe windward, described to be serially connected with fluidic sensor between pipe and leeward pipe windward, The fluidic sensor includes sensor housing, and sensor housing is connected by the medium entrance that its front end is set with pipe windward, The media outlet set by its rear end is connected with leeward pipe, the meter that the medium import and export passes through setting in sensor housing The connection of amount chamber;Managed windward at it due to the plug-in type Pitot tube fluidic flowmeter of this technology and jet biography is serially connected with and leeward pipe between Sensor, therefore considerably increase the resolving power of product so that the need for its occasion that disclosure satisfy that medium pole low speeds flow, can solve Certainly Pitot tube resolving power difference problem.Chinese patent 201410042184.8 discloses a kind of differential pressure flow measurement system, its bag Include the pressure sensor for being connected to measuring circuit.Elon gated probe device is configured for insertion into pipeline, and the pipeline carries process Fluid stream.Pressure sensor senses the pressure difference produced in fluid stream when fluid flows through detector.Vortex shedding stabilizer is determined Position is into close to elon gated probe device and being positioned in process fluid stream.Vortex shedding stabilizer is configured to stabilization near elongated spy The vortex shedding surveyed in the fluid stream of device.
Pitot tube sensor has connecting pipe and pressure head, and connecting pipe includes ram-air pipe and static tube, the top of pressure head With pitot hole and baroport, the hypomere of pressure head is cylindricality joint, and the pitot hole passes through total head passage and the ram-air pipe Connection, baroport connected by static pressure passage with the static tube, the ram-air pipe and static tube and the differential pressure transmitter Input is connected, and the signal output part of differential pressure transmitter is connected with the signal input part of the flow computer, above-mentioned knot The Pitot tube mass flowmenter of structure be only applicable to measurement pipeline in only a kind of gas, and gas be in standard state (normal temperature is normal Pressure) under mass flow, when in use, Pitot tube sensor hangs down the Pitot tube mass flowmenter of said structure from the side wall of pipeline Be inserted straight into pipeline, allow pitot hole and baroport central point line on the axis of pipeline, pitot hole against fluid come Stream direction, baroport against fluid go flow direction, when fluid flows in pipeline, in the total head interface of connecting pipe upper end and quiet Crimping mouth distinguishes the total head and static pressure of the fluid flowed in output channel, with total head and static pressure that fluid is flowed in pipeline, The volume flow of fluids within pipes can be calculated by fluid mechanics principle, further according to the fluid in pipeline in normal conditions The density of (normal temperature and pressure), finally calculates the mass flow of fluids within pipes in flow computer, and shows on computers Show.But it is mixed multi-component gas when what is flowed in pipeline, and under the conditions of actual process (off-rating), above-mentioned knot The Pitot tube mass flowmenter of structure then cannot accurately measure the mass flow of mixed multi-component gas in pipeline.
Utility model content
The purpose of this utility model is to provide a kind of Pitot tube integrated gas mass flowmenter, to overcome prior art The shortcoming of the mass flow of mixed multi-component gas in pipeline cannot accurately be measured.
The utility model provides a kind of Pitot tube integrated gas mass flowmenter, it is characterised in that:The Pitot tube is integrally Change gas mass flow gauge include Pitot tube sensor, differential pressure transmitter, flow computer, vortex frequency sensor, drainage tube, Pipe flange short tube, temperature transmitter and pressure transmitter, the Pitot tube sensor include a connecting pipe being vertically arranged, Connecting pipe bottom is pressure head, and connecting pipe sequentially passes through pipe flange short tube, flanged ball valve and drainage tube, tube method from bottom to top Annulus is formed between blue short tube and connecting pipe, annulus, vortex frequency sensor are also formed between drainage tube and connecting pipe Connected with pipe flange short tube by probe tube, the output end of vortex frequency sensor is connected with the input of flow computer, draws Flow tube top and connecting pipe top are connected with differential pressure transmitter respectively, and drainage tube top is also associated with temperature transmitter and pressure becomes Send device, the output end of temperature transmitter, pressure transmitter and differential pressure transmitter by holding wire with the input of flow computer End connection.
The utility model is further technically characterized in that:The internal diameter of the connecting pipe is generally 40~70mm.
The utility model is further technically characterized in that:The general internal diameter than connecting pipe of the internal diameter of the pipe flange short tube Big 4~10mm.The pipe flange minor tube inner diameter is equal with drainage bore.
The utility model be mainly used in accurately measuring flowed through in pipeline under the conditions of actual process (off-rating) Mixed multi-component gas mass flow.Such as it is mainly used in natural gas, oil, chemical industry, metallurgy, the gas dosing of environmental protection industry, Such as torch gas, gas field are dropped a hint, the gas dosing of furnace flue gas etc..
The utility model this have the advantage that compared with prior art:A kind of Pitot tube integrated gas matter of the utility model Amount flowmeter, combines the technical foundation of Pitot tube and toll bar vortex, can accurately measure mixed multi-component gas in pipeline Mass flow.
The utility model is described in further detail with reference to the accompanying drawings and detailed description, but accompanying drawing and specific Implementation method is not intended to limit scope of the present utility model.
Brief description of the drawings
Fig. 1 be a kind of Pitot tube integrated gas mass flowmenter of the utility model be arranged on pipeline on when sectional structure Schematic diagram.
Fig. 2 is the structural representation of Pitot tube sensor in Fig. 1.
Reference is shown in figure:
1st, Pitot tube sensor;2nd, differential pressure transmitter;3rd, flow computer;4th, pressure head;5th, connecting pipe;6th, pipe flange Short tube;7th, annulus;8th, drainage tube;9th, temperature transmitter;10th, pressure transmitter;11st, vortex frequency sensor;12nd, sample Pipe;13rd, flanged ball valve;20th, circular port;21st, pipeline.
Specific embodiment
Referring to Fig. 1-Fig. 2, a kind of Pitot tube integrated gas mass flowmenter of the utility model, Pitot tube integration Gas mass flow gauge includes Pitot tube sensor 1, differential pressure transmitter 2, flow computer 3, vortex frequency sensor 11, drainage Pipe 8, pipe flange short tube 6, temperature transmitter 9 and pressure transmitter 10, the Pitot tube sensor 1 are vertically arranged including one Connecting pipe 5, the bottom of connecting pipe 5 is pressure first 4, and connecting pipe 5 sequentially passes through pipe flange short tube 6, flange ball from bottom to top Valve 13 and drainage tube 8, the top of drainage tube 8 and the top of connecting pipe 5 are connected with differential pressure transmitter 2 respectively, and the top of drainage tube 8 is also connected with There are temperature transmitter 9 and pressure transmitter 10, the output end of temperature transmitter 9, pressure transmitter 10 and differential pressure transmitter 2 passes through Input of the holding wire with flow computer 3 is connected, and annulus 7 is formed between pipe flange short tube 6 and connecting pipe 5, is drawn Flow tube 8 and annulus 7 is also formed between connecting pipe 5, vortex frequency sensor 11 is by probe tube 12 and pipe flange short tube 6 Connection.
A kind of Pitot tube integrated gas mass flowmenter of the utility model, the internal diameter of its connecting pipe 5 typically from 40~ 70mm, the general 4~10mm bigger than the internal diameter of connecting pipe 5 of internal diameter of pipe flange short tube 6, the internal diameter and pipe flange of drainage tube 8 The internal diameter of short tube 6 is usually equal.
The simple course of work of the present utility model is:
A kind of Pitot tube integrated gas mass flowmenter of the utility model, needs on the wall of pipeline 21 when installing and using Circular port 20 is opened up, the radial dimension of circular port 20 is typically in the range of the internal diameter and pipeline of the connecting pipe 5 of pitot tube flow sensor Between the internal diameter of flange short tube 6, Pitot tube sensor 1 is mounted on pipeline 21 by pipe flange short tube 6, stretches connecting pipe 5 Enter in pipeline 21, open flanged ball valve 13, due to the utility model in the connecting pipe 5 and pipe flange short tube 6 between Annulus 7 is formed with, annulus 7 is also formed between drainage tube 8 and connecting pipe 5, be used to conduct the vortex of flowing gas, The input of vortex frequency sensor 11 is connected by probe tube 12 with the pipe flange short tube 6, its signal output part with The signal input part of the flow computer 3 is connected, and the mixed multi-component gas in pipeline 21 can be by connecting pipe 5 and tube method Annulus 7 between blue short tube 6 enters into probe tube 12, and vortex frequency sensor 11 is by detecting the frequency of vortex, and handle Measurement signal is input to the flow computer 3, calculates mixed multi-component gas density in normal conditions;During this is new Annulus 7 is also formed between described drainage tube 8 and connecting pipe 5, temperature transmitter 9 is connected with drainage tube 8 and pressure is become Send device 10, the signal output part of temperature transmitter 9 and pressure transmitter 10 and the signal input part phase of the flow computer 3 Even, it is measurable go out pipeline 21 in mixed multi-component gas actual temperature and pressure, and measurement signal is input to flow rate calculation Machine 3, differential pressure transmitter 2 is connected with drainage tube 8 and connecting pipe 5 respectively, can measure the pressure difference between drainage tube 8 and connecting pipe 5, and Measurement signal is input to flow computer 3, in conjunction with the flow of mixed multi-component gas in pipeline 21, standard state it is close Degree, and using the temperature and pressure under the actual condition in pipeline 21 as compensation, calculated by flow computer 3, finally Draw the mass flow of mixed multi-component gas in pipeline 21.
The standard density of mixed multi-component gas is calculated, theoretical reasoning is as follows:
When gas is popped one's head in by the Pitot tube sensor 1 as swirl generating body in pipeline 21, alternately produce regular Vortex (Von Karman vortices), theoretical according to Von Karman vortices, the volume flow Q 1 of gas and the frequency f of vortex pulse are directly proportional, i.e., Q1=k1× f, wherein k1It is proportionality coefficient.
Meanwhile, according to Pitot tube principle, the volumetric flow of gas measured by Pitot tube sensor 1 and differential pressure flowmeter Q2=k2The square root of the business of × (square root of (△ P/ ρ)), wherein k2Be proportionality coefficient, △ P be total head and static pressure pressure difference, It is gas density under standard state.
The two volume flow Qs 1, Q2 should be equal, therefore can calculate the density value ρ under mixed gas standard state.

Claims (4)

1. a kind of Pitot tube integrated gas mass flowmenter, it is characterised in that:The Pitot tube integrated gas mass flowmenter Including Pitot tube sensor, differential pressure transmitter, flow computer, vortex frequency sensor, drainage tube, pipe flange short tube, temperature Degree transmitter and pressure transmitter, the Pitot tube sensor include a connecting pipe being vertically arranged, and connecting pipe bottom is to take Pressure head, connecting pipe sequentially passes through pipe flange short tube, flanged ball valve and drainage tube, pipe flange short tube and connecting pipe from bottom to top Between form annulus, also form annulus between drainage tube and connecting pipe, vortex frequency sensor is by probe tube and pipe Road flange short tube connection, the output end of vortex frequency sensor is connected with the input of flow computer, at the top of drainage tube and pilot Pipe top is connected with differential pressure transmitter respectively, and drainage tube top is also associated with temperature transmitter and pressure transmitter, temperature pick-up The output end of device, pressure transmitter and differential pressure transmitter is connected by holding wire with the input of flow computer.
2. a kind of Pitot tube integrated gas mass flowmenter according to claim 1, it is characterised in that:The connecting pipe Internal diameter be 40~70mm.
3. a kind of Pitot tube integrated gas mass flowmenter according to claim 1 and 2, it is characterised in that:The pipe The internal diameter of road flange short tube 4~10mm bigger than the internal diameter of connecting pipe, pipe flange minor tube inner diameter is equal with drainage bore.
4. a kind of Pitot tube integrated gas mass flowmenter according to claim 1 and 2, it is characterised in that:It is described to lead The internal diameter of pressure pipe is 40~70mm, the internal diameter 4~10mm bigger than the internal diameter of connecting pipe of pipe flange short tube, in pipe flange short tube Footpath is equal with drainage bore.
CN201621142812.0U 2016-10-21 2016-10-21 A kind of Pitot tube integrated gas mass flowmenter Active CN206269871U (en)

Priority Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107976222A (en) * 2016-10-21 2018-05-01 中石化洛阳工程有限公司 A kind of Pitot tube integrated gas mass flow measurement methods
CN109253781A (en) * 2017-07-13 2019-01-22 深圳市美好创亿医疗科技有限公司 The calibration method and calibration system of throttle type differential pressure flow sensor
CN110058047A (en) * 2019-05-14 2019-07-26 哈尔滨工程大学 Steam flow rate measuring system in a kind of runner

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107976222A (en) * 2016-10-21 2018-05-01 中石化洛阳工程有限公司 A kind of Pitot tube integrated gas mass flow measurement methods
CN109253781A (en) * 2017-07-13 2019-01-22 深圳市美好创亿医疗科技有限公司 The calibration method and calibration system of throttle type differential pressure flow sensor
CN110058047A (en) * 2019-05-14 2019-07-26 哈尔滨工程大学 Steam flow rate measuring system in a kind of runner

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