CN209117084U - A kind of vortex-shedding meter releasing upstream straight pipe demand - Google Patents

Abstract

A kind of vortex-shedding meter releasing upstream straight pipe demand, it is related to the flow detection of vortex-shedding meter in industrial process automation, including shell, through-flow channel on shell, the influent stream end of through-flow channel is equipped with flow conditioner, in through-flow channel, vortex shedder is provided on rear side of flow conditioner, the annular sleeve and several thin-wall tubes being filled in annular sleeve that the flow conditioner includes and through-flow channel is coupled, thin-wall tube in two quadrants of annular sleeve or so is symmetrical, and the axis of every thin-wall tube and the axis of circulation duct are parallel to each other.In not changing the fields such as current petroleum, chemical industry the design rule of device compact arrangement under the premise of, realize the accurate detection of flow, ensure the product quality of user, improve the benefit of user；Solve safety in production at present and continuous time of driving upper irreconcilable contradiction.

Description

A kind of vortex-shedding meter releasing upstream straight pipe demand

Technical field

The utility model relates to the flow detections of vortex-shedding meter in industrial process automation, especially suitable for releasing upstream The vortex-shedding meter of straight pipe demand.

Background technique:

Currently, the vortex-shedding meter that the detection of flow uses in industrial processes automation is adjusted substantially without flowing Whole device, but vortex-shedding meter requires that the preceding fluid media (medium) fluidised form of metering is stablized, and must not have the asymmetric shakiness such as Pulsating Flow, rotating flow Constant current state.The error very high, the flow generation of detection otherwise can be made very big is required fluidised form degree of stability, or even can not be measured, To cause economic loss to user.

In order to reach the measurement accuracy requirement of vortex-shedding meter, only increase the straight tube of vortex-shedding meter upstream and downstream Section, the straight pipe for generally requiring upstream as the case may be will reach 40D ~ 15D etc., and downstream straight pipe also requires 5D or more, It is as shown in the table:

Since the design of present chemical production device is based on the considerations of benefit, installation area is smaller and smaller, device Become more compact, so almost in all projects, so that the Automation Design personnel are difficult to find that needed for existing flowmeter Upstream and downstream straight tube.A large amount of flowmeter is used in the occasion for being unsatisfactory for straight pipe requirement, runs reluctantly, directly results in flow Data it is unreliable, great harm is generated to safety, benefit.

In view of the above-mentioned problems, the prior art, which has, carrys out stationary flow in the separately installed tube bank rectifier in the upstream of vortex-shedding meter State, but to make between tube bank and shell, reach tight fit between tube bank and tube bank, it is along the circumferential rotating flow of tube bank to eliminate It is extremely difficult, so that the popularization of pipe bundle type fluid rectifier be made to be very limited with use.And installation cost is very high.

Summary of the invention

The purpose of the utility model is to overcome disadvantages mentioned above, provide efficient one kind, low cost, without straight pipe, and It is not limited solely to the turning of 90 degree of upstream, it may include the vortex-shedding meter of the releasing upstream straight pipe demand of all kinds of choked flow pieces in upstream.

Purpose to realize the present invention provides following technical scheme: a kind of flux of vortex street releasing upstream straight pipe demand It counts, including shell, the through-flow channel on shell, which is characterized in that the influent stream end of through-flow channel is equipped with flow conditioner, through-flow In pipeline, it is provided with vortex shedder on rear side of flow conditioner, the flow conditioner includes being coupled with through-flow channel Annular sleeve and several thin-wall tubes being filled in annular sleeve, the thin-wall tube in two quadrants of annular sleeve or so are mutually right Claim, the axis of every thin-wall tube and the axis of circulation duct are parallel to each other.

Preferably, vortex shedder is rhombus column, the central axes of rhombus column and thin-wall tube bilateral symmetry axis are parallel.

By thin-wall tube rectification and rhombus column rectification, realize without rule needed for the vortex-shedding meter under the straight pipe of upstream Then flow field.

Preferably, the distance between thin-wall tube and vortex shedder are 3~4D, D is the diameter of runner pipe.

Preferably, the pore size range of thin-wall tube: 1/8~1/10D, D are the diameter of runner pipe.

Preferably, the length range of thin-wall tube: 3/8~3/10D, D are the diameter of runner pipe.

Choked flow piece of the vortex-shedding meter to the requirement source of upstream straight pipe in upstream generates mixed and disorderly vortex and flow field point The distortion of cloth causes to measure extraordinary error, or even thoroughly lose so that vortex-shedding meter can not generate required " Karman vortex street " It loses.In order to solve flow distortion this problem, we divide " vortex and the distortion of eliminating flow field ", " adjustment flow field " the two parts To solve.

The rectification of the utility model combination thin-walled multitubular bundles and rhombus column rectification, are realized without the vortex street under the straight pipe of upstream Regular flow field needed for flowmeter.

The utility model the utility model has the advantages that

The premise of the utility model design rule of device compact arrangement in not changing the fields such as current petroleum, chemical industry Under, it realizes the accurate detection of flow, ensures the product quality of user, improve the benefit of user；Solves current safety in production With continuous time of driving upper irreconcilable contradiction.

Detailed description of the invention

Fig. 1 is the utility model partial sectional view；

Fig. 2 is the half-section diagram of draft tube in Fig. 1；

Fig. 3 is the structural schematic diagram of flow conditioner in Fig. 1.

Specific embodiment

Embodiment 1: a kind of vortex-shedding meter releasing upstream straight pipe demand, including shell 1, the draft tube on shell 1 Road 2, the influent stream end of through-flow channel 2 are equipped with flow conditioner 3, in through-flow channel 2, are provided on rear side of flow conditioner 3 Vortex shedder 4, the flow conditioner 3 include the annular sleeve 3.1 being coupled with through-flow channel 2 and are filled in annular sleeve 3.1 Several interior thin-wall tubes 3.2, the thin-wall tube 3.2 in 3.1 or so two quadrants of annular sleeve is symmetrical, every thin-wall tube 3.2 axis and the axis of circulation duct 2 are parallel to each other.Vortex shedder 4 is rhombus column, the central axes of rhombus column and thin-wall tube 3.2 bilateral symmetry axis are parallel.

Thin-wall tube is expired according to the internal diameter of vortex-shedding meter, in entire runner pipe lumen loading, and any thin-wall tube Axis must assure that parallel with the axis of runner pipe, main function is to eliminate the vortex and flow field point that upstream choked flow piece generates A rhombus column is placed in the distortion of cloth at the L of thin-wall tube rear, and the axis and thin-wall tube bilateral symmetry axis of rhombus column are parallel, Further fluid flow fields are rectified into Flow Field Distribution needed for meeting vortex-shedding meter.

Thin-wall tube does conference and the effect for cutting down vortex is deteriorated, in order to preferably cut down vortex, it is necessary to which thin-wall tube is done It is small, but if upstream has foreign matter to flow through to be easy to hang on pipe, thus also bring obstruction risk；The length of thin-wall tube is got over The effect of long abatement vortex is better, but the longer additional pressure drops of length are higher, so that it is peculiar to sacrifice vortex-shedding meter Energy saving effect, and thus body length obviously increases, can lose the meaning for exempting from upstream straight pipe in many occasions, thus While eliminating the vortex that upstream choked flow piece generates, also need to take into account obstruction risk and the additional pressure loss.

(1) by various Work condition analogues, suitable aperture, length are finally determined.

(2) since the demand of vortex-shedding meter stream field does not require that harsh rotation internal layer, vortex-shedding meter is logical at present Capable triangular prism vortex shedder, for overcoming the flow distortion of generating body axial direction to have born advantage.And really flow field is abnormal The influence of change essentially consists in the mass flow discrepancy weighing apparatus of two fluoran stream surfaces of generating body or so, therefore we utilize diamond shape rectifier structure, It is deformed by forcing to flow away efficiently against left-right asymmetry flow field.(3) it determines between multitube rectification and diamond shape rectification Suitable dimension.Too long spacing can cut down application effect, so that product is too long；Too short size will lead to final rectification effect Required effect is not achieved；Size and the diameter of multitube tubule, length between multitube rectification and diamond shape rectification have close association.

Example: the diameter of DN25 runner pipe be 24mm, the distance between thin-wall tube and vortex shedder be 3~4D, i.e., 72- Between 96mm；The pore size of thin-wall tube: 1/8~1/10D, i.e. 3mm~2.4mm；The length of thin-wall tube: 3/8~3/10D, i.e., 9mm~7.2mm.

Claims (5)

1. a kind of vortex-shedding meter for releasing upstream straight pipe demand, including shell, the through-flow channel on shell, feature exists Flow conditioner is installed in, the influent stream end of through-flow channel, in through-flow channel, vortex street hair is provided on rear side of flow conditioner Raw body, the flow conditioner include and the annular sleeve of through-flow channel mating and several thin-walleds being filled in annular sleeve Pipe, the thin-wall tube in two quadrants of annular sleeve or so is symmetrical, the axis of every thin-wall tube and the axis of circulation duct It is parallel to each other.

2. a kind of vortex-shedding meter for releasing upstream straight pipe demand according to claim 1, which is characterized in that vortex street hair Raw body is rhombus column, and the central axes of rhombus column and thin-wall tube bilateral symmetry axis are parallel.

3. a kind of vortex-shedding meter for releasing upstream straight pipe demand according to claim 1, which is characterized in that thin-wall tube The distance between vortex shedder is 3~4D, and D is the diameter of runner pipe.

4. a kind of vortex-shedding meter for releasing upstream straight pipe demand according to claim 1, which is characterized in that thin-wall tube Pore size range: 1/8~1/10D, D be runner pipe diameter.

5. a kind of vortex-shedding meter for releasing upstream straight pipe demand according to claim 1, which is characterized in that thin-wall tube Length range: 3/8~3/10D, D be runner pipe diameter.