A kind of built-in rectifier for Ultrasonic Wave Flowmeter
The utility model is related to gas flow control technology field, and in particular to a kind of for Ultrasonic Wave Flowmeter
Ultrasonic flowmeter has a non-contact measurement, and measurement accuracy is high, measurement range is wide, it is convenient for installation and maintenance and compared with
The advantages of low use cost, just it is widely used in field of flow measurement, especially the gas such as coal gas, natural gas, oil gas
Popularized in measurement.Ultrasonic flowmeter is that one kind uses very easily flow instrument, therefore by the joyous of users
With the fast development of ultrasonic flow meter technology, ultrasonic flowmeter is widely used to natural gas, oil gas
With the measurement of the gas such as coal gas.In order to ensure measurement accuracy, need to carry out at rectification gas when ultrasonic flowmeter works
Ultrasonic flowmeter is in operating conditions, it is necessary to ensure that the natural gas fluidised form that fluidised form enters flowmeter is symmetrically to fill
Distribution exhibition turbulent velocity distribution, but under practical working situation due to by valve in channel bend and metering pipeline to natural
The VELOCITY DISTRIBUTION of gas, which can have a direct impact, causes fluid disorderly in pipeline, irregular flowing, therefore would generally pacify in pipeline
Rectifier is filled, improves flow distribution.
The gasotron used in the market is required to according to GB/T18604-2001《Use Ultrasonic Wave Flowmeter
Measure gas discharge》In relevant regulations, the upstream straight length of Ultrasonic Wave Flowmeter at least has 10D, downstream straight tube
Section at least has 5D, and its purpose is to ensure that the natural gas fluidised form for meeting symmetrical turbulent velocity Spreading requirements can enter inbound traffics
Meter.But the installation situation of pipeline can not meet this requirement in real work situation, cause ultrasonic flow rate measurement amount error big.
Notification number is disclosed built in a kind of gas ultrasonic flow sensor for CN102141420B Chinese patent literature
Formula rectifier, carries out multilayer arrangement for 0.5mm~1mm thin-walled rectifying tube by tube wall and is fixedly connected into overall structure, its one end
For level, the other end is inclined-plane, and inclined-plane angle is 45 degree ± 15 degree；The diameter of rectifying tube is by inner and be sequentially reduced outside；Adjacent tubes
It is gap structure between wall；The diameter of each rectifying tube cannot be greater than 1/3rd of ultrasonic sensor main pipe diameter, each
The maximum gauge of rectifying tube is no more than 30mm.Built-in rectifier for gas ultrasonic wave flow sensor, come improve completely flow through by
This section of flow field of measuring section, i.e., will make ultrasonic transducer launch and receive this section of ultrasonic wave transmission of ultrasonic energy
Flow field where distance, is to be in laminar flow or one section of flow field closest to laminar condition；Applied to ultrasonic flow timing, it is not required to
Want to install preceding straight length before flowmeter additional again, the reaction of choked flow effect and Pulsating Flow produced by it is greatly reduced.
The built-in rectifier is disadvantageous in that the air-flow after rectification is uniform not enough.
Utility model content
In view of the deficienciess of the prior art, the invention provides a kind of built-in rectification for Ultrasonic Wave Flowmeter
Device, complicated Pipe installing situation can not be met by solving present rectifier, fluid is adjusted under more satisfactory measuring condition, had
What is imitated solves influence of the fluidized―bed furnace change to measurement accuracy.
The technical solution of the utility model is as follows：
A kind of built-in rectifier for Ultrasonic Wave Flowmeter, described rectifier is arranged on ultrasonic flowmeter
Fluid line arrival end, the internal diameter of the rectifier is identical with the internal diameter of fluid line, is D；Described rectifier include according to
Contorted flabellum, described mistake are provided with the first pipeline, transition conduit and the second pipe of secondary setting, the first described pipeline
Pipeline is crossed for a vacant duct, distribution equalizing structure is provided with described second pipe.
In the above-mentioned technical solutions, the effect of the first pipeline is to carry out the disorderly gas for entering Ultrasonic Wave Flowmeter
Break up, weaken local too strong air-flow, the air-flow for making irregular air-flow be flowed in this formation rule.Transition conduit is a blank pipe
Road, re-mixes the air-flow broken up, air-flow is more uniform after transition conduit.Second pipe is by by the rotation of the first pipeline
The air-flow turned changes into the air-flow of streamlined flow.
Preferably, described distribution equalizing structure is made up of multiple annulus being radially arranged, the tube wall of annulus and second pipe
Between provided with uniform radial spoke, annulus is divided into some sectors.
Preferably, described annulus is provided with 4~6 rings, wherein the internal diameter of minimum annulus is 0.2D, described radial spoke
Angle H between bar is 30 °~60 °.
Preferably, described distribution equalizing structure is the honeycomb of regular hexagon.
Preferably, that the regular hexagon is 0.1~0.2D to edge lengths N, wall thickness T is 0.5~2mm.
Preferably, the wall thickness of the rectifier is 0.5~2mm.
Preferably, the length B of first pipeline is 0.2~0.5D.
Preferably, the length F of the transition conduit is 0.2~0.4D.
Preferably, the length Q of the second pipe is 0.2~0.5D.
Preferably, the angle C that the flabellum of first pipeline is set between 7~10 leaves, flabellum is 10 °~45 °.
Compared with prior art, it is of the present utility model to be beneficial in that：
Ultrasonic gas flowmeter rectifier of the present utility model, efficiently solves fluidized―bed furnace change to measurement accuracy
Influence.It can be built in actual applications in ultrasonic flowmeter, subsidiary 3D straight lengths design eliminated, for front end
10D straight tube installation environment can also be down to 3D straight tubes.It is either all big in the requirement of installation environment or the manufacturing cost of producer
Big reduction.In actual applications, in face of various different installation environments, bend pipe or pipeline reducing diameter, this built-in rectifier ultrasonic wave
Flowmeter is in measurement error with reaching higher level in repeatability.
Brief description of the drawings
Fig. 1 is the overall structure diagram of rectifier of the present utility model；
Fig. 2 is the structural representation that rectifier of the present utility model is placed in ultrasonic flowmeter；
Fig. 3 is Fig. 2 top view；
Fig. 4 is the schematic cross-section of the pipeline of the utility model first；
Fig. 5 is the schematic cross-section of second pipe in embodiment 1 of the present utility model；
Fig. 6 is the schematic cross-section of second pipe in embodiment 2 of the present utility model.
The built-in rectifier for Ultrasonic Wave Flowmeter a kind of to the utility model is made further below in conjunction with the accompanying drawings
It is described in detail.
As shown in figure 1, a kind of built-in rectifier for Ultrasonic Wave Flowmeter, includes the first pipeline of secondary setting
101st, contorted flabellum is provided with transition conduit 102 and second pipe 103, the first pipeline 101, transition conduit 102 is
Distribution equalizing structure is provided with pipeline, second pipe 103.The length B of first pipeline 101 is 0.4D, and the length F of transition conduit 102 is
0.2D.The length Q of second pipe 103 is 0.4D.
As shown in Figure 2 and Figure 3, rectifier 1 is arranged on the arrival end in the fluid line 2 of ultrasonic flowmeter, rectifier 1
Internal diameter it is identical with the internal diameter of fluid line 2, be D, the wall thickness of rectifier 1 is 1mm.
As shown in figure 4, the first pipeline 101 is provided with the contorted flabellums 3 of page 9, the angle C of flabellum 3 is 40 °.
As shown in figure 5, the distribution equalizing structure in second pipe 103 is the alveolate texture of regular hexagon, each regular hexagon 4
To edge lengths N be 0.1D, wall thickness T be 1mm.
Rectifier built in the Ultrasonic Wave Flowmeter of the present embodiment in addition to the distribution equalizing structure in second pipe 103,
Remaining structure is same as Example 1.
As shown in fig. 6, the distribution equalizing structure in second pipe 103 is made up of multiple annulus 5 being radially arranged, interior annular and the
Provided with uniform radial spoke 6 between the tube wall of two pipelines 103.
Annulus is provided with 4 rings, wherein the internal diameter of minimum annulus is 0.2D, the angle H between radial spoke 6 I 45 °.
Preferable implementation example of the present utility model is the foregoing is only, the utility model is not limited to, it is all in this reality
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.